Popular Mechanics 1929-12: Vol 52 Iss 6

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<E PAGE 88!

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: TUNE IN! | $ 4 | Erno Rapee : NWA? and the pane} ness Mobiloil Orchestra vy ; 5. a of 55 pieces every Wednesday night over WEAF and as- sociated NBC stations “What ie you notice first about the New Mobiloil?” Motorists answered: ‘It lasts longer’ When the New Mobiloil had been in use several months, we sent investigators to call on motorists in different parts of the United States and Canada. We wanted their unbiased opinion of this new oil. Our investigators asked: “What do you notice first about the New Mobiloil?” Motorists everywhere answered: “Mobiloil lasts longer.” What is the significance of these three words “Mobiloil lasts longer”? Perhaps they sound unimportant at first glance. But as a matter of fact, they are the most sig- nificant words in the science of lubrica- tion. For, in comparing oils of similar “hody,” engineers have proved that the oil which lasts longest, also lubricates best. a <s the New Of course, we already knew the New Mobiloil was the longest-lasting oil on the market. We had given it every scientific and practical test we could devise. Through all hours of steady speedway driving at an average speed of nearly 70 miles an hour, we conclusively proved that the New Mobiloil stands up better and lasts longer under every speed and condition of driving. This is why we can say to you: “The New Mobiloil will keep the first-year feel in your engine, lubricate your engine better— it lasts longer.” VACUUM OIL COMPANY Makers of high quality lubricants for all types of machinery

Mobiloil Keeps the first-year feel in your engine

Pe 16-17 Ki

ISSUE Publish ec Vol. Can The Strz In § Hut Toy Wit She Hor Airpla

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Popular Mechanics Magazine 200 E. Ontario Street, Chicago, U.S. A. H. H. WINDSOR, Founder H. H. WINDSOR, Jr., Editor and Publisher ion: Hachette & Cie., Paris: Hachette & Cie., Lond Melbourne: Gordon & Gotch 16-17 King William Street, Charing Cross, W.C. 2 111 Rue Reaumur 509-513 Litt‘e Collins Se. ISSUED MONTHLY SUBSCRIPTION: SINGLE COPY, 25 CENTS In United States and its possessions, also Canada, Cuba, and emane per year, postpaid - $2.50 To all other countries in the Postal Union - - - - - 3.00 All subscriptions are discontinued at expiration. Diibee examine the eine printed on your wrapper. Entered as Second Class Matter Sept. 15, 1903, at the Post Office at Chicago, Illinois, under Act of March 8rd, 1879. Entered as Second Clas Matter at the Post Office Department, Canada. Published monthly by POPULAR MECHANICS CO. Copyright,1929, by Popular Mechanics Co. Copyright in Australia. Copyright in France Vol. 52 Contents for December, 1929 Special Features My Twin-Cylinder Flight around the World Canada’s Flying Gold Rush The Detective of the Future stiwwuasaeecatae Strange Adventures in Davy Jones’ Graveyard | NT rere 938 In Step with the Stars en Hecke) toe ; Hurdles to Jump Bg RN ees wae eee See, ae EP et Toys Make the Man ...... With the Snow Fighters Shcoting at the Moon How the Plane Is Built Airplanes Bottle Opener—on pencil tip fits in vest pocket 953 chair on top of wing for jumper 960 Buildings—sixty-three- “story is most economical 976 engine built like a barrel 984 Camera—revolves to “‘shoot” from any position 989 filling station for, at London aerodrome 929 Cathedral—shave windows of 950 larger planes promise lower flying fares 951 Chemistry—to outlaw war 984 one landing-wheel plane accepted by army 968 Coal ¢ throat phones to eliminate roar of motor 905 substitutes for, tested 969 traps blackmailer by trailing pigeon 912 truck fills containers 984 Aluminum—white finish for 951 Dog—wheel chair for injured 983 Anesthetic—takes away fear of surgeon’s knife 945 Dredge—turns water of lake into land 952 Art—jointed model for artists 953 Electricity—cost of making 950 Automobiles Electric Light—first model of station in Ford museum 902 camouflage makes autos crow like roosters 902 Feet—impression on inked pad reveals ills 992 convertible coupe provided with a metal top 983 Fish and Fishing test machine finds defects in front end of car 911 Chinese fish walks on land 944 Automobiles, Accessories crooked hook helps land fighting fish 960 rubber boot for shift lever 912 paddle water to keep fish alive while shipped 904 table that attaches to front seat 923 raze “stone” fish found hiding in coral 911 Automobiles, Truck—rubber tail light for 984 Fly Paper—luminous, catches insects at night 960 Aviation Fowl—tissues of, kept alive for seventeen yeas 993 airway lights in U. S. cover ten thousand miles 922 Fuel—harness winter sun for heat to cut costs 902 electric parachute flare 987 Golf—balls dotted in colors easier to find 967 highway signs guide pilots 961 Health—judged by eyelashes es : 961 lights turned on by siren on speeding plane 937 Heating and Ventilating—humidifier and air cleaner pilots fly spiral courses when blindfolded 992 one unit : ’ 999 sky harbors of the future 970 Horses—auto truck hauls six horses each in cwn stall. 945 skyrocket blazes way across sky 926 House—of future ‘s seen in glass building 968 Boats and Boating Household Devices 990 caterpillar boats on river pull box car barges 988 House Plan . ; 1055 speedboat leaps onto bank 977 Ice Well—is good refrige-ator for dairy 93 water shoes make sailboat 897 Impersona*‘ion—art of make-up taught in strange school 903 {Continued on Page 4]

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[Contents—Continued] Insects—the war of the ages Inventions—dance of whispering sands pes ca in- ventors . Jewelry—revolving stand keeps tools in order Ladder—is kept from slipping ” anes rods ake—beavers stop Pp he Leaves—alcohol makes red Life Preserver—flexible life raft holds twelve Life-Saving—catapult to shoot life line resembles can-

non , Light—artificial daylight is best for color parsers La Lighting—symphonies in colored light .... Metals platinum substitute found in “‘konel” tungsten carbide penetrates the hardest Monument—Washington, over nine million visitors to Moon—the new moon at sunset in all climes Motorcycle—runs candy cart Moving Pictures—for home, cabinet holds named and screen Music—transformed to light Needle—cushion fits on spool ‘ Oil Tank—of spheroid shape gives ‘added strength ; Oysters—pink, are wholesome .. ‘ mi Parachute and seat combined for air safety dummy leaps from airplane to test . tri-colored reduces landing shocks Plants food doubles growth c garden tool prepares hole for setting out Pneumatic Tubes—do the work of 300 boys Radiator—shelf bracket for .. Radio—soldering iron works like fountain pen Radio—Aerial—light-socket antenna kink Radio—Apparatus—making a midget multimeter Radio—Application—radio compass for small craft Radio—Broadcasting—queer radio sound effects made to order Radio—Coils—plug-in coils wound on tube bases Radio—Condenser—handling charged filter < Radio—Construction—good connections important Radio—Eli tor A Radio—Receiver adding audio stages to beginner’s screen-grid .. _ employs five screen-grid tubes set in octagon table top Radio—Reception bringing out the bass notes . regaining lost sensitivity ; Radio—Repairing—cleaning tip of soldering iron . Radio—Television broadcasting in England new scanner employs shutter Radio—Tubes—emergency clips for screen-grid Railroads dumper overturns coal car giant locomotives squeeze through tunnels schools on, help to train workers . train is cooled by iced air windows for upper berths ... Rats—prove acquired traits inherited Rowing—machine is portable Serving Tray—revolving for dining table Ships and Shipping—river beggars collect alms with baskets ; Stove, Oil—fills itself from big. tank Street Car—foot-controlled operated like auto Submarine—gun that patches, also aids in rescues

906 904 : 977 945 an 905 904 1003 1000 1012 i009 1012 1014 1012 1010 .1014 1014 905 993 961 911 989 998 968 976 999 .. 905 . 976 935 Telephones—U. S. has the world’s or direct circuit 983 Tin Cans—profit in See 936 Toaster—heats inside of bun . 992 Traffic—speedway for autos over railroad 944 Tunnel—under Detroit river for motor cars . 929 Water—tiny electric heater carried in pocket ....... 960 AMATEUR MECHANICS Airplanes a scale-model plane is easy to build ........... 1026 i i . 2. 5 66 cabeessdadense duns 1034 Seber Dame Fel Me onc. cccwescccsececcesss 1024 Automobiles—Accessories

handy spark-plug carrier .... 1034 rubber tube keeps spark plugs dry 1037 Automobiles—Driving—postage =e prevent head- light glare a tdearead th ode hae dale 1033 Automobiles—Repairing anti-rattler for front fender my 1019 cable replaces noisy brake rods 1025 Basement—extra shelves in .... 1035 Bed—cover for child’s .............. 1037 Birds—a heated cafe for SAD tie 1036 Boats and Boating ic shut-off for the out- board motor ..... ai 1034 Breakfast Nook—shelf for the _.. ; 1025 Brick—imitation for the Christmas tree 1034 Canvas—floor covering for the kitchen 1032 Check—fingerprint as protection . 1019 Christmas Tree—dressing up the .. 1020 Curtain—lace used for stencils 1025 Dividers—washer makes a good hermaphrodite attach- ment for ... 1038 Extension Cord—insulating an electric 1018 Eyeglasses—cement for celluloid rims 1024 Fish and Fishing—old bathtub makes fish pond 1019 Flowers—arranging in shallow dish 1033 Fruits—winter protection for bush . 1025 Glass—black ink for writing on .... 1035 Glue—spreading liquid quickly ; 1033 Guns—auxiliary magazine for shotgun 1032 Lawn—green, without grass 1018 Photography—photographing red aninge ‘ 1038 Pictures—brads steady small ; . 1019 Plants—potting house 1038 Poison Ivy—eradicating 1018 Saws and Sawing—improving the crosscut guide 1035 Tractor—used as locomotive 1018 Tricks—easy chemical 1015 Veneer—regluing on curved surfaces ... . .1033 SHOP NOTES Advertising—substitute for stickers in 1052 Armature—repairing a_ short-circuited 1044 Automobiles—Fuel—test shows filter reduces oil changes .... Be 1043 Automobiles—Repairing _ correct method of repairing chassis . 1042 how to hold a fender bow 1045 overheating of motor caused by water pump 1049 running truck with broken axle 1049 Boxes—pasteboard, tool for cutting open 1054 Bulletin Board—handy shop 1042 Clamps—angle-iron corner fixture for 1044 Decorating—with a pastry gun 1039 Filing Cabinet—new type takes little space 1043 Garage—removing monoxide gas from 1050 Hammer—prolonging the life of handle . 1045 Lathe—tool tray for 1052 Machinery—oiled at close of the nd starts easily in rat et Sa ah a0 ceece s 1050 Milk—automatic cooler 1044 Paints and Painting—painting imitation brick joints 1049 ae Smoker’s—making a hammered-copper holder “ me Se. »'s “we 10 Planer—brush holder for the .. 1052 Putty—durable homemade 1053 Reflector—work lighted by 1043 Refrigerator—auxiliary lid for 1053 Saws and Sawing power saw cuts disks quickly 1050 using a hacksaw in confined places 1043 Setscrew—T-handle bolt as substitute for 1053 Sheet Metal—punching holes in 1052 Steam Shovel—lifts heavy truck 1045 Steel ladle of frozen, cut in two with == lance 1054 soldering stainless ... , 1053 Threads—device for checking 104 Thumbtack—puller ............. 1053 Valve Spring—device for testing .. 1042 Vise—holding small objects in _ — 1042 Workshop—a practical h de combination 1046

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POPULAR MECHANICS ADVERTISING SECTION to bnprove Yourdspech in social life, business, and public speaking, is now explained in this great new hand- book—a complete guide to the fullest development of your powers of expression— SS How to Talk A Manual of Effective Speech By John Mantle Clapp and Edwin A. Kane is a treasury of ideas and methods for IMMEDIATE USE in Business Meetings, Interviews, Selling, Committee Work, Club Meetings, After- Dinner Talks, Public Speeches, and every other situation of personal or business life. Thousands of men and women have already eagerly demanded this new handbook of speech because it deals with problems of expression for the first time in an intensely practical way. clearly just what you want to know, shows just how to use the priceless information it offers, covers completely every situation and explains fully how to master that situation. contents indicate the wide range of the subjects treated in this remarkable book: OVERCOMING YOUR PERSONAL DIFFICULTIES Analyzing Your Own Case. Practicil methods you can apply at once to obtain an immediate improvement in your ability to talk effectively in any situation. Improving Your Vocabulary A_ simple method for testing your knowledge of words. How to develop accuracy in use of words. Enunciation and Pronunciation. Simple wethods for training yourself to speak plainly and correctly. Developing Your Voice. you can improve your voice. Self-Training in Language. How to adjust expression to audience, occasion, and purpose. Self-Training in Your Delivery. Nervous- ness and the remedy. Gestures. Easy ways by which PUBLIC SPEAKING Getting Ready to Speak. How creat speakers per. Assembling and organizing your ma- erial. Facing Your Audience. Main points you need to keep in mind. Noting room. Gauging audi- ence. Getting started. Finding the right voice tones. Handling emergencies. Impromptu ad- ditions to ¥ .. —— 8 hes. Resting your audience. aking your bearings. Informai Addresses. How to make an imme- diate improvement in your ability as an informal speaker. Formal Speeches. How to introduce speakers. Official courtesies. Responses. Festive Occasions. How to speak at gente dinners. Good form. How long to talk. Toast- master and his functions. The Plea for a Cause. favorable action. YOUR BUSINESS SPEECH Speech in Your Business Life. How to make ed conversation businesslike without being abrupt. Persuasion. Getting Your Conversations with Your Employer. Reports and suggestions. Your Conversations with Your Employees. to give Avoiding misunderstandings. How orders: wrong and right methods. Business Conferences. time. ting results. Service Conversation in Business. Com- plaints. Adjustments. Trading Conversation Involving Buying or Lessons you Can learn from the method Fundamentals of good Selling. of the skilled salesman. buying technique. YOUR ACTIVITIES IN CLUBS AND PROFESSIONAL ORGANIZATIONS Committee Work. Organization. Committee Chairman. The following partial Cutting down wast Reconciling differing points of view. Get- Meetings—Parliamentary Practice. Duties of chairman and individual members. Motions. It tells 647 pages, 35 chapters e “... It is a veritable speech- encyclopedia .. . above all practical . . . recognizes and meets actual speech problems that confront us in our ordi- nary reiationships .. . drawn from the experience of busi- ness men, professional men, and the man of the street... . presented so simply and so directly and with such a wealth of illustrative ma- terial that it is self-teaching.” M. M. Hoover, Asst. to the Director University Exten- Safeguards and ma t of YOUR HOME AND SOCIAL LIFE y Your Family Circle. The art of companionship. Conversation with- in the family. Social Conversation. Conversa- tion with strangers, with casual ac- quaintances, family and intimates. No Advance Payment Fill in and mail the coupon, The will be sent you, de- livery charges prepaid. Keep “How to Talk’’ for five days. Read a few pages here and there. Then decide whether it gives you the help you need. If you don’t feel that it will prove one of the best investments you ever made in your life—just send it back and that ends the matter. Otherwise send $5.00 in full payment. Use this coupon > , PiSent for 5 Days’ Free Examination sion, Columbia University. (Fill in, tear out and mail) The Ronald Press Company Dept. M230, 15 East 26th St., N. Y. You may send me postpaid a copy of “How to ‘alk,”” by John Mantle Clapp and Edwin A. Kane. Witbin five days after its receipt I will either send you $5.00 in full payment or re- turn the book. PEED. 6 v0.0 6n05 9 betters vices #ubees (Please Print) AGGIE. « c ccc ccccccscensscceccese CP ccccsses State®......60. *Outside continental U.S. and Canada, $5.00 cash, plus 25 cents for shipping.

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To Rescue Stranded Aviators by Means of a “Cloud of Smoke by Day and a Pillar of Fire by Night”; the Kite, Easily Folded into Small Space, Is Flown and a Smoke-Produc- ing Flare Is Pulled up the Line on a Trolley; the Process Can Be Repeated Indefinitely and the Kite Might Help Tow a Plane Wrecked on Water pales Bors <-+ ete Oe, PPY th Fy der’. cee

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POPULAR — MECHANICS MAGAZINE Circulation Department POPULAR MECHANICS MAGAZINE Renew my subscription to Popular Mechanics for one year, starting ‘ issue. I will send $2.50 on receipt of bill.

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Popular Mechanics Magazine 200 E. Ontario Street See ee ee ee ee

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Popular M REGISTERED IN U. S. PATENT OFFICE echanics Magazine WRITTEN SO YOU CAN UNDERSTAND IT Vol. 52 DECEMBER, 1929 No. 6 328 Miles an Hour! News Was Received at Night That Italy Had Not Withdrawn from the Schneider Cup Races, So Work Pro- ceeded on the Second Supermarine Rolls-Royce at Calshot with the Aid of Searchlights By CHRISTOPHER SPRIGG A TINY blue and white monoplane, its pontoons, each almost as big as its fuselage, glinting silver in the sun! In- side, cramped, masked and goggled, the pilot moves at a speed man has never touched before—and lives! Filling the heavens with sound, the deafening boom of his engine, its supercharger gulping fuel at the rate of two gallons a minute! 3ehind it a still smaller, blood-red mon- oplane, missing death by hair’s-breadths as it strives in vain to catch the silver sea- plane, skimming the water so that the un- supercharged engine might suck a mix- ture one iota denser than that of its rival. The pilot, fighting against unconscious- ness while the cockpit fills with air tainted by the exhaust gases! Below blue water, above blue sky, and around, on the golden sands of the coastline, more than a mil- lion people, their eyes riveted on the spec- tacle. So was history made in the Schneider cup race this year, held in England and christened the greatest event in mechan- ical sport. For two years the most bril- liant aeronautical brains of four countries had worked to produce aircraft that would be triumphs of modern mechanics. Day in and out motors roared on test benches, and engineers peered into wind tunnels, testing, verifying, experimenting. Italy expended $5,000,000 for development. England spent $1,000,000 on one engine. France allocated $1,800,000 for her racing aircraft. 881

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882 POPULAR MECHANICS Unusual Features of the Racer as Shown by Diagram; the Floats That Carried Gasoline, Water Radiators in the Wings and an Oil Chamber in the Fin On the day of the race gathered the skilled pilots who were to stake all, in one breathless hour, on the brains and skill of their engineers and mechanics. Some had already confessed defeat. France avowed that her. machines had not devel- oped the expected speed, and withdrew. Italy sought a postponement, but it was decided that the rules forbade. Lieut. Al- ford Williams, famous American ace, playing a lone hand, was unable to get his Mercury racer ready in time, and so Eng- land was given no chance to meet again the rival who had twice defeated her. The Italian entries were two Macchi 67’s. These were low-winged monoplanes, with sixteen-cylinder motors arranged in three banks. More than 1,200 horsepewer, it was rumored, was crammed into each of these engines. Nestling beside them was the Fiat, the trickiest aircraft ever built. Only Sergeant Agello, the under- sized Italian pilot, could climb into it, and it fitted him like a glove. Already this type had killed one pilot and injured an- other, for its controls were as light as a feather and it landed at 125 miles per hour. Its motor had two banks of six cylinders each. And its wings were mere stubs. Near by was the most extraordinary speed craft ever built, the Savoia-Marchetti racer. It had no fuselage or tail, for two 1,000-horsepower engines were placed back to back and between them the pilot sat, with a propeller in front and another aft. Two booms from the side stretched behind each side of this propeller, and car- ried the control surfaces which would in .a normal aircraft have formed the tail. Then there was the British superma- rine “S-6,” a craft with a mystery motor. This was the new Rolls-Royce, never flown in a race before, with two banks of six cylinders each, supercharged, and with a geared-down air screw, which, it turned out, developed some 1,600 horsepower, making it the most powerful gasoline mo- tor ever built. Wings as well as fuselage and pontoons were of metal, and the gas was carried in the pontoons. Cooling water from the motor ran between two skins of duralumin forming the outer skin of the wings. Oil, to be cooled, passed along the fuselage to the hollow tail fin and back to the engine. Contrary to Italian practice, both machines had the whole fin above the fuselage, claiming it gave better stability at high speeds. After winning the race in his superma- rine at a speed of 328.63 miles an hour, Flying Officer Waghorn was asked how it felt to fly at six miles or more a minute. “Well,” he answered, “I wasn’t dizzy at the turns. The only unpleasantness came from the heat fumes and oil splashes from the engines in the cockpit. My impression ~ wT nh A

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of speed was from the shipping flashing past underneath. I hadn't time to think of anything but the controls.” Sitting almost on the floor in- cased in a cockpit of duralumin, Waghorn had just about shoulder room and no more. The vertical control stick, the nerve center of the craft, was gripped between his knees. So delicately balanced are these high-speed machines that if one float is damaged when the plane hits the water at the 100-mile-an-hour landing speed, death may easily overtake the pilot. “A new ventilator, fitted to the seaplane the night before the race,” said Waghorn, “did a lot to free the cockpit of the stifling exhaust fumes which smother the pilot and blacken his windscreen. Down below in the float I carried 100 gallons of gasoline, a weight of 700 pounds, which would be all used up in an hour or less.” On a level with Waghorn’s eyes was a long funnel-shaped win- dow, giving him a sight along the engine cowling. A few minutes before the starting gun boomed, Waghorn, his ears stuffed with thick wadding to keep out the roar of the engines and propellers, squeezed into his cockpit. Me- chanics fastened and bolted the window above his head, making him a prisoner in what might have been a steel coffin had any- thing broken under the terrific strain. Another young pilot of the 3ritish team describing his sen- sations said: “If you turn very rapidly you may experience a ‘black-out.2 You may become blind because the blood has been taken from the retina of the eye owing to the centrifugal force. This only lasts for a moment, and when the turn is over you can see again perfectly well.” After the victory, event in the world of aviation and its fu- one of the British planes bettered its rec- ture? Traveling at Waghorn’s speed one ord by making 365.1 miles per hour. What is the use of this great sporting nine hours, POPULAR MECHANICS Top to Bottom, Squadron Leader A. H. Orlebar in Supermarine Rolls-Royce “S-6""; Front View of Italian Entry, and Lieut. Dal Molin, Who Was Forced Down could reach New York from London in

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884 POPULAR MECHANICS ficient force to kill rats, rabbits, squirrels or other small game at a distance of seventy yards. The new gun is compressed much like the ordinary air rifle; one compression being sufficient for from one to five shots. The weapon is a single-shell gun, firing shells loaded with slugs from “BB” to 10 size. The slugs scat- ter much as the charge of a shotgun does. FLYING YACHT HAS OPEN DECKS FOR PASSENGERS This House Is Made of Newspapers as Are the Desk and Chair; Lower Right, a Wall Section HOUSE BUILT OF NEWSPAPERS PROVES SUBSTANTIAL To demonstrate a novel use for old newspapers, a Massachusetts man with the aid of his family has constructed a cottage of newspapers and stocked it with furniture of the same material after eight years of patient labor. Some 65,000 daily papers went into the house besides sev- eral thousand rotogravure sections which form a colored border around the tops of the rooms. The walls are made of 215 thicknesses of newspapers, pasted and folded, and subjected to a pressure of about two tons, the surface being strength- ened with three coats of varnish. Roof shingles also are of paper, but floors, raft- ers and window and door sills are of wood. The furniture is made of papers in cylin- drical form, having the appearance of bamboo. Among the pieces are a settee, an octagonal table, a floor lamp, chairs, bookcase and radio. One desk is made entirely of dailies containing accounts of Colonel Lindbergh's Atlantic flight. AIR SHOTGUN SHOOTS SHELLS INSTEAD OF SINGLE SLUGS Actuated by air pressure, a shotgun is on the market which shoots shells instead of single shots. The gun requires neither oiling nor cleaning and shoots with suf- A four-engined twen- ty-four passenger flying yacht has been ordered in Germany by Gar Wood, the famous speedboat builder. The most novel feature of the craft will be two open decks for the use of the passengers when the flying boat is at anchor or taxiing on the sur- face. The after deck will be eighteen feet long and the forward deck ten feet, and both will be eight feet wide, which gives some idea of the enormous size of the hull. Each of the four motors will de- velop 600 horsepower. Doctor Dornier, constructor of the giant flying boat “D-X,” is the designer and builder. Mr. Wood learned to fly more than a year ago, and, in addition to his collection of racing boats and cars, has a seaplane hangar built into his home at Detroit. CAMERA PICTURES EYE BALL AS IT FUNCTIONS Eyes, the best cameras in the world, themselves now are made the objects of photog- raphy with a cam- era made by a Ger- man which pictures the ball of the eye as it functions. The eye camera requires only one-twentieth of a second for exposure. - -—= =. & & oe oO

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EFFECT OF OCEAN CURRENTS ON CLIMATE SHOWN Contrary to the warm Gulf stream, which renders northern Europe mild even in winter, the Humboldt or Peruvian cur- rent is blamed for the barren and arid seacoast of Peru. There ordinarily is no rainfall and the climate is temperate, in spite of the tropical location. This is due to the current flowing northward. from the icy Antarctic. About once in a generation, however, there is a conflict be- tween this current and a warm equatorial current called El Nino. In 1925, the latter was victorious, rain fell and the Peru- vian coast desert turned green and crops were abundant. Ever since, however, the Peruvian current has ruled. MOTOR BUS CHANGES ENGINES LIKE A RAILROAD TRAIN Detachable engines are being used in the motor coaches of a western bus line, this feature enabling a change of motors at division points. The engine may be de- mounted, taken from its hood, and an- other installed in twenty minutes. Hood and bumpers are removed, after which the motor bolts are loosened. The engine is moved from the coach witha winch. Gas, Motor Coach with Detachable Engine, the Motor Be- ing Changed at Division Headquarters battery and water lines are disconnected and the motor is taken to the shops to be repaired or adjusted. Adjusted motors are kept at major stops, so that in case of a breakdown, one may be sent to a stalled coach and put in at the roadside. POPULAR MECHANICS A Shopping Bag Which, When Empty, May Be Used by the Marketing Housewife as a Cushion MARKET BAG BECOMES CUSHION WHEN IT IS EMPTY Serving the double purpose of market bag and seat cushion, a padded container is proving popular with the housewife who desires to go to a ball game or movie before she does her shopping. The sides are padded and the covering is of water- proof material. When empty, it makes a comfortable cushion, and when filled it becomes a light water-tight container. LOCUSTS STOP PLANE MOTOR Locusts, against which airplanes have been waging war in India and Egypt, have succeeded in instituting retaliatory, al- though accidental, maneuvers. One pilot in India who went up to scatter a swarm of the insects was forced down and found one of them had been drawn into the air- intake pipe. Other flyers have been forced to descend after the locusts filled the radi- ators and the engines started overheating. @Three hundred times as sweet as sugar is a new compound made from corncobs, according to claims.

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886 POPULAR MECHANICS TWIN MOTOR LINER’S CABIN HEATED WITH STEAM The Enormous Size of the Eighteen-Passenger Curtiss “Condor” Transport Plane Is Well Illus- trated by the Photograph Above; the Ship Has a Wingspread of Ninety-One Feet Eight Inches and Is Powered with Two Instead of the Usual Three Motors; It Carries a Useful Load of Over Three Tons and Has a Cruising Speed of 116 Miles an Hour ‘*) \. f Pilots’ Cockpit Showing Hinged Control Wheel; View of Cabin Which Has Steam- Heated Radiators, and, Below, the Mighty Condor in Flight; It Can Climb and Main- tain an Altitude of More Than 5,000 Feet on Only One Motor and with a Load of 17,378 Pounds Bottom Photo © Court Commercial

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POPULAR ALL PARACHUTES MUST PASS UNCLE SAM’S TESTS Manufacture and use of parachutes for airplane passengers and pilots are soon to come under governmental regulation. Makers will be required to submit sam- ples for test, and none without approval certificates may be sold. To pass the tests, the parachute must open fully and func- tion properly when dropped from a 150- foot altitude, carrying a 200-pound dummy. Then it must be dropped ten times from 500 feet, with the same weight and with three twists purposely put in the shroud lines. It must untwist and open fully before reaching the ground. Next, the same parachute is to be dropped five times from any convenient altitude carrying an 800-pound lead weight, more than four times the weight of an average passenger. If it gets through all these tests without damage, three “live jumps” must be made from 2,000 feet, with a rate of descent not to exceed eighteen feet a second, and a landing without discomfort to the jumper. The parachute must be fitted with a quick release by which the user can step out of the harness as soon as he lands, a provi- sion required to take care of landings in water, where the jumper must be able to free himself instantly. RIGHT OR LEFT TURN INDICATED BY AUTO SAFETY SIGNAL Combining a right and left-turn signal, stoplight, spotlight, parking-light and rear-view mirror in one auto accessory is accomplished in a safety signal now on the market. The signal is installed at the left corner post of the car, and extends the width of the running board. On the inside, next the wheel, is the switch box and control handle. The stoplight is con- nected with the brake, the others being operated by pressing a button on the switch box. All signals are visible from the front as well as MECHANICS This Apparatus Detects the Amount of Combustible Gases in the Air of Mines and Factories DANGER OF EXPLOSION SHOWN BY GAS DETECTOR Quick, accurate and safe detection of combustible gases and vapors in oil re- fineries, mines or factories is afforded by a simple gas indicator designed after the instrument for finding fire damp in coal mines, but capable of wider application. The indicator consists of a detector head, a meter and a storage battery. Its work- ing principle is the effect of combustion of inflammable gas and air mixtures on the surface of a glowing filament, the combustion increasing the temperature, and consequently the electrical resistance, of the filament. This causes the meter needle to move over a scale from which readings are taken and referred to a chart which shows gas conditions. The de- tector head may be the rear of the car, giving warning of driver’s intentions, while the spotlight is adjustable to any angle, which can be lowered into a sus- pected chamber alone, or the appa- ratus may be worn by an observer who descends into the done from the in- side of the car. An Auto Accessory Combinin Signals, Stoplight, Spotlight and Mirror chamber to make Right and Left-Turn the test.

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888 POPULAR MECHANICS Built of Sound-Deadening Materials, This Movie-Cam- era Hood Is Being Used for the Talkies “BLIMP” MOVIE CAMERA STOPS NOISE IN TALKIES To smother the sound of operation of a moving-picture camera without the neces- sity of placing both camera and operator in a sound-proof “ice box,” a shield re- sembling a hood for the camera is being used in Hollywood studios. The cover- ing for the camera, when used for talkies, is known as a “blimp” and is constructed of sound-deadening materials, including yucca wood, soft rubber, felt, velvet and wood fiber. The blimp is cheaper than the large boxes in which cameras have been inclosed heretofore to make them sound- proof, and gives greater flexibility in the use of camera angles. It also improves photography by eliminating the plate- glass windows of the ice box, which shut out part of the actinic rays so necessary to photography. The hood weighs about forty pounds. SOIL STERILIZED WITH STEAM TO CURB EARTHWORMS By sterilizing the soil with steam, earth- worms, which often. cause damage to potted plants and other growths in green- houses, are effectively curbed, workers at the Illinois agricultural experiment sta- tion have found. The steam method was the most satisfactory of all tested, but good results also were obtained by water- ing with corrosive sublimate, one ounce in ten gallons of water. TRAFFIC LIGHTS FOR PLANES TO AVERT ACCIDENTS Traffic lights for airplanes, similar in operation to the red and green stop-and- go lights governing automobile traffic, are being installed at a Los Angeles airport to avert collision between arriving and departing ships at night. The signal is a large octagonal frame mounted on a fif- teen-foot post. Reflectors, thrusting out- ward from its sides, face alternately up and down and each row of reflectors has alternating lights so that, when the red light is on in the upward-facing row, the downward beams are green. An arriving plane, if given the red light, knows that another ship is about to take off and stays clear until it gets the green lights, signal- ing the field is ready. In like manner, the pilot on the ground will not take off while the beacon’s rays facing downward are red. The signal revolves, and there is a flasher light in the center. The beams are visible 1,000 feet in the air and 2,000 feet from the field. Model of Traffic Signal for Planes; When Downward Lights Are Green, Opposite Ones Are Red VAT ee a. ae 9 oe -—. ehnaeana a

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Ase SssSsssssh lf Wi ipl ye THE BACKBONE OF AN AIRPLANE -A FUSELAGE By MAJ. REED LANDIS Famous Flyer and War-Time Ace HY does an airplane fly? Though the world last December joined in celebrating the twenty-fifth anniversary of the Wright brothers’ first flight at Kitty Hawk, N. C., the principles of successful flight remain more or less a mystery to many laymen. After all, there is nothing mysterious about a plane. You can find most of its parts in a bird, a boat and a fish. There are the wings and tail and the body of the bird, the rudder of the boat and the keel fin of a boat or back fin of a fish. Add an engine and a propeller to offset your inability to move your wings, as a bird does, and you have a flying machine, or omit the engine and propeller and soar on rising air currents, as the bird some- times does, and you have a glider. Whether that flying machine is the best that can be built nobody as yet knows. For years there has been talk of helicop- ters, ornithopters and orthopters, the first being airplanes which fly straight up and hover in the air, and the latter two types of machines with flapping wings. A bril- liant Englishman once exclaimed that an ornithopter represented the designer’s idea of how a bird’s wing works, and an orthopter was the designer’s idea of how a bird’s wings ought to work. But after all, one doesn’t really want a helicopter; one doesn’t want his airplane to take off vertically from the housetop and land on the roof of the movie show. It may do those things, but their disadvantages out- weigh the advantages. Would you prefer to fall slantwise or straight down? A gliding landing will always be the easier. But why does a ship fly? Take one apart, in your mind, or, better still, build one up from the ground. We'll start with a body for our imaginary ship. It’s going to be a body of welded steel tubing, some- what similar to the skeleton of a bird. Back of the engine we will install a gaso- line tank, and then an instrument board and two seats, and behind them carry the 889

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890 POPULAR MECHANICS ff THE LANDING GEAR 4 SUPPORTS THE _Z FUSELAGE THE WINGS ARE THE CHIEF SUPPORTING SURFACES \ FLIQ THE TAIL PLANE PREVENTS PITCHING FORE AND AFT Sa ~S THE FIN HELPS TO KEEP THE / PLANE IN A STRAIGHT PATH Ad Wi \\ \\\\ pi" \ fuselage in a long streamlined tail. That much of our ship in shape and propor- tions resembles the body of the bird. Next we want a landing gear on which to mount it. Instead of the bird’s two feet we will add a pair of wheels, on suitable struts. Next comes the wing, just like the bird’s wing, except that it is immov- able. In the big planes, our own Ford- Stout air liners, for example, the wing is built up of metal, internally braced and fairly thick—thick enough, in fact, to con- tain within it the gasoline tanks and bag- gage compartments. In any airplane, the shape of the wing is a matter of the ut- most importance. In general, a modern wing is expected to lift from eleven to fif- teen pounds for each square foot of sur- face; so the size of the wing depends on the weight of the shif, engine, fuel sup- ply, pilot and passengers, or pay load, to be carried. Next we will add the tail surfaces, of which there are four. First comes the horizontal stabilizer. It is really a small wing, but is not generally intended to ex- ert a lifting effect. Instead it gives the plane longitudinal stability, as the rush of air sweeping back from the propeller tends to keep it in the same plane as the fore part of the ship, that is, keep the air- plane in level flight. In most ships the stabilizer is adjustable over an arc of a few inches, and can be set while in flight to balance up the distribution of the load and make the ship easier to fly. But we will not always want to main- tain level flight, for our ship must go up and down, so, at the rear edge of the sta- bilizer, we hinge a pair of small wing sur- faces called elevators and hook them, with proper control ‘cables, to our control stick in the pilot’s compartment. The controls are so arranged that if we push the stick forward the elevators tilt down, and if we pull it back they tilt up. What happens then will be explained a little later. Another fixed surface is needed at the tail to keep the ship on a straight course. This is a vertical fin, rising up from the fuselage, like the back fin of a fish. Some- times, instead of being parallel to the lon- gitudinal axis of the plane, the vertical fin is set at a slight angle. The reason is that every single-motored plane has a tendency to turn on one side because of

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POPULAR MECHANICS 891 the torque of the motor. To offset this tendency, one of two things must be done, either the pilot must always carry a cer- tain amount of opposite rudder, or the fin may be set at sufficient angle to just over- come the turning impulse. The rudder completes our tail assembly. It is hinged to the vertical fin and moves between the pair of elevators. It works just like the rudder of a boat, for when it is turned one way or the other, the rush’ of air striking the exposed surface pushes the tail of the ship in the opposite direc- tion, and the nose therefore points to one side. We need one more control to complete our plane, before adding the engine and propeller. That one is the ailerons, by which we keep the wings leveled up when a gust of wind attempts to upset our lat- eral balance, or raise one and lower the other when we want to bank the ship on a turn, to prevent it from skidding, just as a fast automobile would skid at a turn on an unbanked road. When we build the wing, we cut away a portion of the rear, or trailing, edge, near either end, and here we hinge the two ailerons. To make the controls as simple as possible, the con- necting cables are attached to the control stick, which is swiveled to move’ in any direction.- Moving it fore and aft works the elevators at the tail, while moving it from side to side raises one aileron and lowers the other. We have already seen how the rush of air striking one side of the rudder pushes the ship’s tail in the opposite direction. The same power makes our elevators work. In normal flight the air currents flow smoothly over them, but when we pull the stick back the elevators are raised, the wind pushes the tail down, and the nose points up; when we push the stick forward the elevators are depressed, the wind strikes their underside, the tail is flipped upward, sending the ship into a downward course. Pushing the stick to either side lowers one aileron and raises the other, decreas- ing the lifting effect of one wing and in- creasing that of the other, with the result that the ship banks, the wing toward which the stick is pushed dropping and the other rising. A bird gets the same result by warping its wings, but, as our THE RUDDER CONTROLS THE RECTION OF FLIGHT THE ELEVATORS GUIDE THE PLANE FF tHe AILERONS Y_ CONTROL BANKING ON adic yt syste atelie Mitiin Dinah eelltidillenss 4 > OS

SLUMS s NS AN AIR SCREW, PULLING << THE PLANE rORVRO SS y ss Si THE PROPELLER ACTS AS a LZ

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plane wing is rigid, we use ailerons. Add the engine and propeller, and our ship is com- plete. Abroad, the propeller is usually called an air screw, and the name is really better than our word, for it de- scribes its action much more truly. It bores its way through the air just as a screw bores its way into a piece of wood when turned by a screwdriver. Now that we have completed our ship, we are back to the original question: why does it fly? Stick your hand out of the window of a fast-moving auto- mobile or train, tilt your palm slightly upward, and you will find your arm trying to rise. Or go back to your kite-flying days and remember how a kite, when tilted forward against the wind, starts to climb. The same thing happens to our airplane wing when it is pulled through the air at high speed. get off the ground depends upon the size of the wing in relation to the load, and somewhat upon. its design. Some planes take off at thirty- eight to forty miles an hour, and some take off at sixty—the bigger How soon it will MORE THAN TWO-THIRDS ‘OF WING LIFT 1S THE RESULT OF SUCTION: ABOVE AND THE REMAINDER IS PRESURE BELOW \ POPULAR MECHANICS pple Yj ad ULL ly —_ =" : (ia | lan Y THE CONTROL STICK SHIFTS THE ELEVATOR ANA AN IDEAL STREAMLINE Pictures Courtesy Standard Oil Company of New York the load per square foot of wing sur- face the higher the speed must be to get off the ground and remain in the air. The lifting effect of the wing, how- ever, is not, as so many believe, due to the air pressure on its underside. Actually not more than one-third of the lift is due to the pressure from be- low. The other two- thirds is due to a partial vacuum on the top of the wing, and here it is that good wing design plays such an im- portant part. The THE AILERON BANKING CONTROLS THE up cal thi the an dr: lez wi ha

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POPULAR MECHANICS upper surface has a pronounced curve or camber. An air current rushing across this curve does not follow and cling to the surface, but rather is slightly deflected, and the air along the wing surface is drawn up into this higher-speed current, leaving a partial vacuum, into which the wing is pushed by the air below it, only to have the vacuum always keep a step ahead. ARTIFICIAL-HAIL TESTS SHOW DAMAGE TO CROPS Interesting facts concerning the damage to corn crops by hailstorms have been re- vealed in a series of tests at the Illinois agricultural experiment station. The ef- fect of real hail was simulated by cutting the leaves and otherwise mutilating grow- ing corn plants. It was found that clip- ping off the tip half of the blades was slightly worse than cutting out alternate four-inch sections on each side of the mid- rib. Each of these operations was more harmful to the plant than the less on one side of all the leaves or the removal of half the number of blades. The tests were made in cloudy weather or in the evening to reduce injury from excessive water loss. TOOL SHELF ON TOP OF LADDER GIVES ADDED SAFETY Useful features of both ladder and plat- form have been combined in a safety- platform ladder now on the market. The ladder is of the spreader type with steps in the front and rungs in the rear. About three feet from the top is a substantial platform extend- ing from the front to the rear rails. The top is fitted with slots for tools, nails or screws, and is hol- lowed out at the front so as not to interfere with the movements of the person on the plat- form. The ladder is held in position by a spreader near the platform and may be folded compactly for carrying. 893 BLACKBOARD FOLDS LIKE BOOK TO ADD WRITING SPACE A Swinging Blackboard Which Takes Up Little Wall Space but Gives Large Writing Area Resembling a giant book, a swinging blackboard with four leaves, or eight pages, now is being installed in many schools. Such a board does not take up much wall space, but affords a large writ- ing area. The leaves may be fastened firmly in any position, enabling four stu- dents to work at the blackboard at once by turning one of the leaves at right an- gles to the wall. It may also be sus- pended by a pipe framework where the wall type is not desired. Other advantages of the swinging board are that future work may be placed on it by the teacher, and permanent records may be kept on its leaves without risk of erasure. It may be adjusted so pupils obtain the best light and may be locked securely. TRANSPARENT PRINTS TO SHOW COLOR COMBINATIONS Transparent prints are being employed to show the effects of various color com- binations for automobiles, wall and floor coverings and clothing. A line cut of the object to be colored is printed with a solid background on transparent paper. Sample color cards are then inserted be- neath the transparent print to show the actual appearance of the color combina- tions when applied to the article.

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894 POPULAR MECHANICS CATWALK TO SUPPORT SUSPENSION-BRIDGE CABLES Catwalks for the Longest Suspension Bridge in the World, Connecting New York City and Fort Lee, N. J.; on the Catwalks Are Being Spun the Cables to Support the Structure Catwalks of the Hudson river bridge . between New York City and Fort Lee, N. ‘J., have been completed and on them are being spun the four thirty-six-inch cables which will support the central span of what will be the longest suspension bridge in the world. The towers are 635 feet high, with an additional eighty feet of temporary steel on top. The bridge will be 8,500 feet long, 120 feet wide and will have eight vehicular traffic lanes. The cost is expected to be $60,000,000 and it is estimated that the bridge will be com- pleted early in 1932. LASTING PHONOGRAPH NEEDLE PRESERVES RECORDS Eliminating the necessity of frequent changes of needles on the phonograph, a permanent needle now is on the market which, the makers claim, preserves the records and renders loud or soft music as desired. The needJe is inserted in the sound shaft like the ordinary kind. Near its end is a small adjustment screw and, out of the shorter shaft, protrudes a fine steel wire corresponding to the point of the ordinary needle. Lengthening or shortening this protruding part regulates the sound, and a range of one millimeter (one twenty-fourth of an inch) represents the difference between loud and _ soft music. The wire fits into the play groove, distributing friction equally instead of boring into the groove or _ scraping along the sides. A point too long or bent may be broken off the wire, after which it plays as before. The permanent needle is said to play 50,000 records or more without any attention other than adjust- ing it for pitch. TVVONN PR PRORES TS @An unbreakable saxophone and clarinet reed has been made of aluminum, thus eliminating this annoyance as well as splits and warping. m Ww m m Ww al

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POPULAR MECHANICS 895 MAGIC-LANTERN STAGE SCENES LOWER COST OF SETTINGS Two Austrian scientists have found a means. of projecting stage scenery on a white background through an ordinary magic lantern in such a way that actors may stand within two feet of the scenery without casting a shadow. As far as the audience is concerned, the setting is in- distinguishable from that made in the or-. dinary way, and the cost is much lower. A system was found for drawing the slides so that the lantern in the back wings need be only two feet in front of the curtain, the setting being projected at a sharp an- gle. In making the slides, it is necessary to work backward from the projection de- sired, and the slides resemble a meaning- less jumble of lines and angles. In tests, persons in the audience were unable to distinguish real pillars from projections on the screen of similar pillars. It is ex- pected the apparatus will make possible more scenes and a greater variety of them. AUTOMCBILE RACK THAT TIPS REPLACES SERVICE PIT Saving the installation of a more expen- sive service pit, an automobile rack that teeters like a seesaw now is being installed in garages. The rack is mounted on an angled base, so that when the car is driven onto it the apparatus tips forward to leave the auto in horizontal position, while ele- vation is afforded by running the car back- ward on the support, causing the rack to tip. It is used for alinement, brake ad- justments, washing and greasing and has axle press, and axle and tracking gauges. — sonenecons A Rear Light Mounted on Luminous Card, Worn by London Pedestrians to Avoid Accidents REAR LIGHT FOR PEDESTRIANS TO AVOID ACCIDENTS Traffic in London is so congested that cautious pedestrians are equipping them- selves with lights to warn motorists of their presence on the streets. One of the forms is a rear light, consisting of an electric lamp and reflector mounted on a luminous card that is worn on the back and is sus- pended by a cord from the shoulders, An Automobile Rack That Tips Forward or Backward, Accord- ing to the Position of the Car PADDLING WATER KEEPS FISH ALIVE Chinese inventiveness is re- sponsible for an effective, if un- scientific, way of aerating the wa- ter in the large tubs where carp fry are being kept while being shipped. An arrangement of floats, which is operated by an attendant, paddles the surface of the water, and by this simple means sufficient fresh air is intro- duced into the water to allow the fish to breathe during the journey.

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896 POPULAR MECHANICS: ALTITUDE. FEET Aeon eanr. gs TAS + 5000 A +2000 “oy Sketch Showing Conditions under Which Ice Dangerous to Planes Is Likely to Form on Wings and Fuselage STUDY ICE FORMING ON PLANES FOR SAFER FLYING Interesting tests conducted by the Na- tional Advisory committee for aeronautics at Langley field, Va., have revealed im- portant facts concerning the menace of ice formation on airplanes while in flight. Aviators long have recognized the danger, as, under certain conditions, ice coats the edges of the wings and struts, “mush- rooms” into irregular shapes and seriously impedes the flying efficiency of the ship or forces it down. The Langley field tests, performed with a plane equipped with special thermometers and surfaces for the more accurate study of the formations, further emphasized the ice peril, but, con- trary to popular belief, the greatest haz- o TEMPERATURE, DEGREES F. ard, the experiments re- guoes comers, 3° | vealed, is confined to a limited range of temper- atures and ways are avail- able for avoiding the zee perils resulting from ice gathering, although ade- quate means to prevent the formation are not known. The real danger zone was found to lie in a narrow temperature belt just below thirty- two degrees Fahrenheit, 3e°4 when clouds, fog or rain were encountered. At thirty-one degrees, for instance, or slightly lower, dangerous clear * 38 mushroom ice was de- fs posited. The tests'showed od that this menacing . ice if can be identified by its ©, ase4_ lack of color and that,-by means of distance ther- mometers set in the wings and enabling the pilot to determine the temperature of the air through which he is fly- ing, the danger zone can be avoided by going to levels where warmer or colder air will be encoun- tered. At temperatures well below thirty-two de- grees, ice gathered on the plane, but it was pure white in color, more like snow, did not produce formations detrimental to flying and often blew off as fast as it gathered. Neither kind of ice presented a hazard due to extra weight, the experiments indicated, as the weight of the deposit practically canceled the weight of the fuel consumed. It was found that oil, grease, wax and paraffin were of little good in preventing the for- mation of ice; in fact, the substances were a greater hazard than the plain surface. @Popular Mechanics Magazine does not publish the name of the maker or seller of any device described in its pages, but this information is kept on file and will be fur- nished free upon application to our Bu- reau of Information. the alw thi: anc des ne\ pre the the SOU is poi tio mo mo SY bet by rol pai Di an mi: rol the cui are

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POPULAR MECHANICS THE NEW MOON AT SUNSET IN ALL CLIMES 897 ni J ANTARCTIC SOUTH TEMPERATE TROPICS NORTH TEMPERATE ARCTIC THE OLD MOON JUST BEFORE SUNRISE WOULD BE THE REVERSE, THAT IS, RIGHT AND LEFT (THE MIRROR REFLECTION ).— FOR DIFFERENT LATITUDES WITHIN THE CLIMATIC ZONE AND, FOR DIFFERENT SEASONS OF THE YEAR, THERE WOULD BE SLIGHT VARIATIONS FROM THE APPROXIMATE POSITIONS SHOWN Artists accustomed to inserting a new moon in a picture in the most artistic posi- tion often transgress the laws of nature, as the horns of the crescent moon must always point in a definite direction, de- pending primarily on the latitude of the observer. In the north temperate zone, the new moon as seen just-after sunset always points upward and to the left: In this latitude the sun circles to the south and, as it approaches the western horizon, descends obliquely from left to right. The new moon, following the sun, takes ap- proximately the same course, and since the horns always point away from the sun, they turn upward and to the left. In the southern part of the earth, the reverse is true, while in the tropics the horns point almost directly upward. The posi- tion of the old moon as it rises in the morning is the reverse of that of the new moon as viewed from the same latitude. SYMPHONIES IN COLORED LIGHT PLAYED MECHANICALLY Golored light may be made to sway, ben@ and sweep over displays or buildings by acontrol mechanism like a piano-player roll; the perforated paper fed into the ap- paratus making the color combinations. Diniming is accomplished without flicker, and the changes are made. in a predeter- mined. order. As the perforated paper roll passes the openings in a tracker bar, the functions of turning on and off cir- cuits and the operation of the dimmers are performed automatically. The cir- cuits operate independently, as does the dimmer, giving gteat flexibility of com- binations. Manual operation is also pro- vided by a console keyboard like that of a pipe organ. WATER SHOES MAKE SAILBOAT FOR NOVEL SPORT Water shoes in which the passenger stands upright form the basis for a sailing- shoe plane, or sailboat, in which the sail- or’s body becomes part of the craft. To the shoes is anchored a reversible sail, and a rudder, enabling change of direction of the craft by a movement of the body, while speed is regulated with the sail, is attached to the shoes and body. A Nifty One-Passenger Sailboat, the Basis of Which Is a Pair of Oversize Water Shoes

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M4 + <

Twin-Cyling :

The Two-Cylinder Ship in Which Baron Warthausen Circumnavigated the Globe Being Pulled through the Streets of Rangoon, Burma, with Its Wings Folded; the Little Plane Cost $1,800 By BARON KOENIG WARTHAUSEN In an interview with Andrew R. Boone HAD no intention of flying around the world when I took off at Berlinta year ago for a non-stop flight to Moscow: Yet the world called, and, as my little machine seemed thoroughly trustworthy, I went on, Fashions in adventure do change. T.wo years ago, one attempting such a flight would have loaded his plane with all sorts of safety devices preparatory to flying over long stretches of water. I have undér- taken no such hazardous flights. Miné is purely .ae priyate,, sporting expedition, started as a one-day flight and lengthened into a year’s world tour,’ The fact that -my Kttle monoplane is powered with a tiny two-cylinder engine which develops “a. maximum of twenty horsepower should not cause you to think I am foolhardy in flying thousands of miles with such little power to pull me 898 along. It has proved quite sufficient, es- pecially in view of the low landing speed of the plane. Seldom does it move more than twenty miles an hour when the wheels touch the earth, yet it flies easily at seventy miles an hour. When I left Berlin in August, 1928, I had done only seventeen hours’ flying, and I had never flown at night. Since the trip to Moscow would require sustained _ flight-extending longer than the duration of daylight hours, I started at-night, sure I could maintain a the course hy watch- ing my magnetic compass carefully. Sure enough, when dawn broke, I saw the Baltic sea far on my right and knew I had not lost my way. When I reached Moscow I thought I might as well go on to Baku, and when I reached the Caspian sea I decided to fly to Teheran. I spent

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Flight Aro theWorld oo four weeks in the Persian capi- tal, sight-seeing and awaiting the end of the Indian rainy sea- son. As the only way to return ow was by air, I decided to fly to the Persian gulf and return by ship. I still did not want to turn back, however, and went on to Cal- cutta, Akyab, Rangoon and sangkok. Strangely, the only three inci- dents that slowed my progress at all occurred in Persia, during the early half of my flight. On one occasion, a downdraft, or descending air current, along a mountain range brought me to a forced landing while yet at an altitude of 8,400 feet, and on two other days a depleted petrol supply and a loosened gasoline \ (a ite " f Above, the Twenty-Three-Ycar-Old German College Student, Who Set Out on a Day’s Journey and Continued around the World; Below, Burma Natives Admiring His Tiny Plane 899

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900 POPULAR MECHANICS connection caused me to descend hur- riedly, though these were not in a strict sense forced landings. The worst of these befell me when the petrol supply became exhausted. I was flying between Shiraz and Bushire, in Per- sia. I left Shiraz with just enough fuel to complete the journey. I had to cross successive mountain ranges rising to 12,000 feet and I was afraid the machine might not be light enough to rise to an altitude of 14,000 feet, its maximum being 15,000. I flew at 14,000 feet meeting heavy winds. Just as I cleared the last moun- tain range the engine stopped—no more petrol! Fortunately I was able to bring the plane down to the desert and land near a small village, where I stayed with the local sheik until two men brought fuel on a camel. : In the same neighborhood, a severe downdraft along the side of a mountain range literally pushed me into the ground. My plane touched the earth at an altitude of 8,400 feet. I had never landed so quickly and effectively before. There I was—no food, no water and apparently far from habitation. While there was plenty of fuel in the tanks, I could not take off from the small area offered and could not pull the plane alone to an open space about a half mile distant. So, I took to my feet and walked six hours down to a dry river bed, where I found a camp. There I got help and, more important, food and drink. Fortunately I had taken the trouble when in the Per- sian capital to learn something of the lan- guage. My German, French and English would have been of no avail here. On the following day, with a group of Per- sians, I walked back to the plane. They helped me push it the half mile to a place where the sand was not so soft, and I took off again. The only other unforeseen landing took me down along the coast of Persia. A screw had worked loose on the gasoline line and my engine revolutions dropped from 2,900 to 2,700. Naturally I was not sure of the cause, and as I was then flying at an altitude of 300 feet, I felt it would be safer to descend and locate the trouble. Afterward, I continued my journey to Karachi. Had more serious trouble developed, I might have spent some time on that island. On another occasion I flew into a flock of thousands of flamingoes in Baluchistan. This pre- sented the danger of a broken propeller, and I pulled away from the birds quickly. I had a deal of luck in escaping these situations without undue delay and at times felt I was fighting for my life, espe- cially since I was totally unfamiliar with the terrain. -Very fortunately, good weather opened up ahead during nearly every day of flight. From Moscow south- ward, I followed the railway. Across Per- sia the general trend of the mountain chains guided me, and from the Persian gulf onward, the greater part of the route lay along the coast line. Another View of Baron Warthausen’s Ship at Rangoon, with Wings Spread for Flight; the Only Untoward Incidents of the Small Craft’s Journey Were Three Forced Landings in Persia

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ns fas elt ny us ‘nt ler ds er, ly. se at th od rly h- ‘in an ite POPULAR MECHANICS 901 Admiring Natives Who Greeted the Baron’s Plane in India; His Trip Showed, He Declared, That the Peoples of All the World Are Familiar with Aviation as a New Mode of Travel The little machine I fly is a low-wing monoplane, powered with a two-cylinder Mercedes-Benz engine. I bought it for $1,800. Half of this paid for the engine, which was entirely hand-made. Although the motor develops no more power than a motorcycle engine and gives fifty miles to the gallon, it has had no serious mechani- cal breakdown throughout the journey. I had no thought of “blazing new trails.” In all respects, the flight has been a pleas- ure trip made for my own enjoyment, I hope, however, that it will have helped throw the world open to any flyer with a small machine and the necessary impulse. Since aviation has developed to its present state, countries are not farther removed from each other than cities once were. One attempting such a jaunt need not pursue dangerous courses. He need not fly over the sea. He usually can follow air routes of a sort and have reasonable assurance of reaching his destinations. Wherein does the value of such a flight lie? It demonstrates what can be done with a light plane within the reach of modestly lined pockets. These small planes operate economically. Recently, on my trip from San Francisco to Los Angeles, the journey was made on $1.80 worth of gasoline and oil. The plane’s speed is sufficient. I was in the air on the 3erlin-Moscow leg only fourteen hours and five minutes. Throughout my tour I will have seen only fifty flying days, cov- ering in that time approximately 16,500 miles. It should be explained that the en- gine is geared down to the propeller at a ratio of three to one. The engine turns about twice as fast as the average Ameri- can airplane motor, yet it is this high speed that develops sufficient horsepower in such a small power plant. A plane of low landing speed mani- festly is the best type for such a cruise. Low wings give greater stability close to the ground and enable a plane of low horsepower to get off with a shorter run. This is especially valuable, as one never kiiows just how small a space he may have to land in. Many times I have gotten my plane off in eighty feet. Its very light weight (560 pounds) has helped on sev- eral occasions, too. Such a plane can take off from a sand runway where a heavier plane would sink over the tires or nose over. The all-wood wings-have given good service, being hung in such a fashion that they can be folded against the fuselage for storing or transportation. Only five instruments are mounted on the dash. These include a small magnetic compass, air-speed meter, altimeter and tachometer (engine-speed meter) and a thermometer. One of my most profound conclusions gained from the flight is that, while the world may not be air-minded in all re- gions, it certainly has become aviation- conscious.

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902 POPULAR Model of the First Commercial Electric-Light Plant, Designed by Thomas A. Edison FIRST ELECTRIC-LIGHT STATION MODEL IN FORD MUSEUM Built on a scale of one-half inch to one foot, a model of the first commercial elec- tric-light station, designed by Thomas A. Edison, has been constructed for the Ford Museum at Dearborn, Mich., where Mr. Edison’s achievements and the buildings in which he worked are being assembled or reproduced. This station was the Pearl street generating plant in New York, which started operation in 1882 and was de- stroyed by fire in 1890. The lower floor shows coal-handling equipment, furnaces and boilers, the next contains the six dy- namos, each connected to a steam engine, and on the top floor is the bank of 1,000 lamps, used for testing and handling vari- ations in the load. Each dynamo had a capacity of 1,200 'sixteen-candlepower 110- volt lamps. CAMOUFLAGE MAKES AUTOS CROW LIKE ROOSTERS Automobiles with’ exhausts that imi- tated all the barnyard’ sounds from the crowing of roosters to the barking of dogs were used in recent sham battles staged by the British war department. The barnyard exhaust was placed on various war machines to. deceive outpost scouts listening for movements of the “enemy” forces. Anti-tank machines were dis- guised to look like open-air food stalls, and MECHANICS armored cars were built so low they could creep unseen along banks, while baby automobiles were used for scouting pur- poses in the field. HARNESS WINTER SUN FOR HEAT TO CUT FUEL COSTS Harnessing the winter sunshine for heat, to aid in cutting fuel bills, is being attempted by engineers who have found that the solar energy on bright winter days penetrates into artificially heated buildings with southern or southeastern exposure and raises the temperature from fifteen to twenty degrees. The engineers, attempting to capitalize this natural phe- nomenon, use a sunshine recorder as the exterior member of the solar heating plant. It contains two bulbs between which is sealed a small quantity of mer- cury. When sunshine centers on the bulbs, it acts on the mercury to complete an electrical contact, the circuit being linked to the thermostatic-control system regulating the artificial-heating plant. The arrangement is such that, during bright days, the heating plant will provide from fifty to sixty degrees of the indoor tem- perature required, leaving the sun to do the rest to maintain the indoor heat at seventy degrees. A saving of twenty-five per cent in fuel thus may be effected. NEEDLE CUSHION FITS ON SPOOL TO KEEP SEWING IN ORDER Needle and thread are kept together, without the necessity of running the nee- dle into the tightly wrapped thread on the spool,. by means of a needle cushion which is attached to the latter. The cushion is contained in a round piece of metal which slips into the hole in the end of the spool, and may be used repeatedly. @A power site of more than 20,000 horse- power has been discovered in Alaska by aerial survey. ~~ _—- ge

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ld by ir- Or Oo 1g POPULAR MECHANICS 903 ART OF MAKE-UP TAUGHT IN STRANGE SCHOOL order to accentuate some peculiarity or charac- teristic of the person they are to represent. Wigs and costumes also are among the subjects studied. At the upper left “ ' i is a man’s face changed to represent a skull, while other pictures show operatic charac- ters making up. + 3elieving that the preparation of stage make- up for the portrayal of character parts is an art in itself, a Berlin instructor has opened a school to teach embryo actors and actresses the fine points of impersonation. The students learn how to mix colors and how to apply them in

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904 POPULAR MECHANICS Flexible Life Raft Tossed Overboard; Right, Extended to Support Several Persons FLEXIBLE LIFE RAFT HOLDS TWELVE Compressed, when folded, into a space little larger than that occupied by the ordi- nary life preserver, a flexible life raft has been made, which, when extended, affords support for more than a dozen persons. The raft, when in use, unfolds to form a rectangle with cross supports to sustain the weight of those clinging to it. DANCE OF WHISPERING SANDS CHALLENGES INVENTORS While man has succeeded in bending the sea and the wind to his purposes, over neither has he achieved a conquest. Both remain, as always, his most useful allies and his most implacable enemies. An in- teresting example of the insidious but none the less destructive forces of sea and wind is found at points along the Pacific coast. For many years a summer colony flourished at Cohasset Beach, Wash. The shore has peculiar properties which attract and mystify visitors. It is the home of the famous “whistling’ sands.” Many sum- mer homes were built in this area before the sand, by some incomprehensible ca- price, began to march away from the sea. Slowly the great white drift crept inland. Count- less futile efforts have been made to stem its ad- vance. Property owners have erected dikes and walls, and the govern- ment has planted foliage aud built fences, but the sea continues to throw the sand from its depths and the vagrant breezes persist in carrying the silver drift away from the shore. There lies in this whimsical but destructive dance of the sea sands and harpy breezes a fertile field for experi- ment. A fortune awaits the man who suc- ceeds in combating it, but up to the pres- ent time the problem has defeated the efforts of engineers and scientists. Ob- structions may be placed in its way which temporarily slow it up, but the advance continues, and therein lies an unanswer- able challenge to man’s ingenuity. PADDLE WATER TO KEEP FISH ALIVE WHILE SHIPPED Chinese inventiveness is responsible for an effective, if unscientific, way of aerat- ing the water in the large tubs where carp fry are kept while being shipped. An ar- rangement of floats, operated by an at- tendant, paddles the surface of the water, driving in enough air to allow the fish to breathe during a journey. TI n¢ Ww ot at at a

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POPULAR MECHANICS THROAT PHONES TO ELIMINATE ROAR OF AIR MOTOR Telephones for use in noisy airplane cockpits, where conversation otherwise would be in- audible, are arranged for attachment to the throat. A sounding piece pressed against the throat trans- mits words in the form of larynx vibrations. An- other improvement in telephone apparatus is an “iced” telephone receiver for hot-weather use by persons desiring to carry on a long-distance con- versation lasting a quar- ter of an hour or more. The receiver remains cool for fifty minutes and is being tested in London. OIL STOVE FILLS ITSELF FROM BIG TANK Keeping the oil stove supplied with fuel is ac- complished automatically with a kerosene feeder attached to piping connecting stove and oil tank. The feeder is a small cylinder with a float valve inside, the oil flowing by gravity from the tank to the feeder which regulates the amount fed to the stove by the float-valve arrangement. The appliance also may be used for incubators and brooders. At the bottom of the feeder is a faucet where kerosene may be ob- tained for other uses in the home. The Small Cylinder with Float Valve (Upper Left) Automatically Feeds Fuel to Oil Stove This Coal-Car Dumper Picks Up Car and Contents, Turns It Upside Down, and Sets It Back on the Track Upright DUMPER OVERTURNS COAL CAR TO EMPTY ITS CONTENTS Dumping coal cars has been simplified by a device used by one of the eastern railroads which picks up the car and its contents, turns the car upside down to empty the coal into a steel chute, then rights the car and sets it back on its rails, all in a few minutes. The dumper oper- ates through a series of steel fingers which pick up the car and hold it firmly while it is turned over. ALCOHOL MAKES LEAVES RED Leaves turn red in autumn because of alcohol, according to Samuel G. Hibben, of the Westinghouse Lamp company, who has been investigating the matter. They age, and certain chemical products accu- mulate, among them various alcohols. These act on other substances in the leaves to make the bright-colored pigments.

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Spraying Citrus Trees in Polk County, Fla., Where More Than 5,000 Men Were Enlisted in the Warfare against the Destructive Mediterranean Fruit Fly AN and insect, bitter enemies, are about to discover who wields the bal- ance of power on earth. It will mark the culmination of the longest-drawn battle known, the first engagement dating back to prehistoric times. Following the footprints of explorers, the “domesticated” insects have spread as rapidly as the frontiers of civilization. The six-legged pests have ravaged crops, destroyed man’s garments and injured his health so effectually that he is driven into open hostilities. The latest cry of alarm comes from Florida. There, the most recent immi- grant from overseas, the Mediterranean fruit fly, combats 5,000 fighting men. Un- less the fruit fly is routed, its regiments may spread like a consuming flame to every state in the nation. The work of quelling this pest may be judged from an expert’s prediction that if one fly evades the quarantine, which is backed by an appropriation of $4,250,000 from congress, every fruit-growing state in the union will suffer. Another possi- bility, not so remote, is that this species may ally itself with other insect tribes and wreak havoc in every country where it finds food. 906 In its size and general shape, the fruit fly resembles an ordinary house fly, but differs greatly in the color pattern of the body and wings and in its habits. The female fly punctures fruit skins with the sharp end of her body; through these tiny holes, she lays her eggs. Each egg is only one-twenty-seventh of an inch long; sev- eral hundred eggs may be deposited in one cavity by. a succession of flies. They cannot inflict bodily injury to man. But the adult fly continually seeks fresh fruit in which to lay eggs. They die in three or four days if without food; if sufficient nourishment is at hand, they may live from 200 to 300 days. The department of agriculture has advised growers that the destruction of infested fruits and spray- ing are measures that should go hand in hand. Sprays are applied to kill the adults; fruits must be destroyed to kill the eggs. The only certain, now known method of protecting plants against fruit-fly at- tacks is to cover them, when still very green, with ordinary cheesecloth sewed into bags large enough to be slipped over the tree and tied around the trunk. Property worth $1,800,000,000 is threat- ened by the fruit fly in the United States.

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A report from a committee of experts on the Florida front states that eradication of the pest is possible, and will be accomplished with sufficient financial aid. Down the ages, mosquitoes also have tormented man. If they were merely bother- some, we would have justi- fication for war against them. When -we consider that a certain species found in the south will transmit yellow fever and breakbone fever, no further argument is needed. Mosquito - breed- ing places are very diverse. Some spe- cies breed only in tree holes; others, in crabholes on sea beaches; still others, in any chance accumula- tion of water. The house mosquito in the north, the rain- Top to Bottom, Head of Digger Wasp; Robber Fly Killing Smaller Rival, and Pincers of Tiger Beetle barrel mosquito and the yellow-fever mosquito in the south breed in every receptacle of water about residences. Almost any ref- use pile, or cavity where water can accumulate, is ideal for mosquito multi- plication. They use even the footprints of cattle and horses for breeding, as well as places around water pipes, washbasins and fire buckets. Where water must be stored, it is advisable to use screens. Spirits of camphor or pine oil rubbed upon the face and hands will help keep mosquitoes away, but a single application will not last all night. If not averse to the odor of oil of citronella, that also may be used effectively. A solution of one ounce of oil of citronella and four ounces of liquid petrolatum has been tried suc- cessfully. A few drops on a bath towel hung over the head of the bed will keep common house mosquitoes away. When they are abundant, a few drops rubbed on face and hands will keep them away. A very satisfactory mosquito remedy is 907

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908 POPULAR MECHANICS Fumigating Citrus Trees with Hydrocyanic Acid Gas to Kill Scale Insects; the Canopies over the Trees Insure a More Thorough Treatment moist soap. Wet the end of a piece of ordinary toilet soap and rub it gently on the puncture, and. the irritation will soon pass away. Household ammonia, alcohol or glycerine are effective, too. Holding one’s hand near a hot lamp chimney will also relieve irritation. Of about 500 species of fleas, less than one dozen are of importance in the wel- fare of man and the lower animals. The human flea, the dog flea, the cat flea, the stick-tight flea, hen flea and rat flea are the principal species that concern man. In dealing with fleas, as with most other insects, it is important to eliminate breed- ing places first and deal with living mem- bers afterward. Fleas breed copiously on soil or in dust containing animal and veg- etable matter protected from wind, rain and sun, but at the same time watered somewhat. Animals and poultry should be prevented from passing beneath build- ings, infested areas. sprayed with creosote oil, and the breeding grounds covered with salt and thoroughly wetted down. House infestations may be prevented by eliminating pet animals and applying gaso- line to floors after all rugs have been re- moved and the floors scrubbed with soap and water. Applying derris powder to pet animals, or washing them in a weak solution of saponified creosote, will de- stroy fleas upon them. Fleas affect us both as disease carriers and annoyers. The awful bubonic plague was transmitted by fleas. Roaches are a common and offensive nuisance. In temperate countries, only four or five species belong among our household pests; essentially, roaches be- long to tropical countries, where their va- riation and abundance are among the world’s wonders. House roaches are commonly dark- brown, this being a protective coloration device. The head is bent under the body, so that the mouth points directly back- ward, and the eyes down. These insects have senses so highly de- veloped that we must show them some respect. Unless routed out of their hid- ing places, they are very rarely seen. —_— ~ oO as aepepfee=e A

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POPULAR They gnaw at woolens, leather, over- stuffed furniture, the paste on oilcloths and book bindings. Besides, of course, they consume practically all kinds of ani- mal and vegetable matter. In addition to their cunning and stealth, the roaches have an amazing ability to guard against enemies. They display real intelligence in avoiding poisons and food doctored with insecticide. Some students believe that their highly developed senses are the inheritance of centuries, during which man fought to control them. When cornered, a roach will play dead and watch the effect on his hunter. He will not show himself to a housewife, but in restaurant kitchens, where everybody is busy, he will walk boldly. Some simple roach poisons are sodium fluoride, borax, pyrethrum and sulphur. Fumi- gation is often re- sorted to, in ridding premises of roaches. Field Cage for Inclosing Infected Trees; Dragon Fly Eating Prey, and Small Sprayer in Operation MECHANICS But extreme pre- cautions must be taken to avoid the effect of these gases on human beings and pet animals. Car bon-disulphide gas is commonly employed. Chigger bites will spoil the best hu- man disposition. These pests flour- ish during the sum- mer months. After careful study under a microscope, it has been determined that chiggers do not burrow under the skin. They remain attached only by their mouth parts, and engorged like ticks. After some days, they release this hold and fall off. Also, it is maintained authoritatively, that chiggers do not enter skin pores. Their attachment is purely superficial. One method of controlling chiggers is to wear close-mesh, tight-fitting garments. High-top shoes or boots give good pro- tection. Spiral puttees also may be worn. But on account of the heat and discomfort of leg apparel, chemical means have been devised for warring on chiggers. Flower of sulphur dusted over the clothing makes a deterrent. After application, the pow- der should be rubbed down. A talcum- powder shaker aids in distributing the sulphur evenly.

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ener treet nen ne 910 POPULAR MECHANICS Spraying Large Grapefruit Orchard with Tractor Outfit That Permits Application to Several Trees at One Time and Affords Sufficient Pressure for Reaching Difficult Places Four common species of buffalo moths afflict households. In reality, they are not moths but fall in the classification of beetles. They are capable of subsisting on dried animal remains, but thrive espe- cially on fine silks, wool, hair, feathers and fur. They remain secluded in dark nooks, beneath carpets and in garments. In tight chests and trunks, protection may be had against carpet beetles by the use of crystals of naphthalene, or cam- phor, or fumigants such as carbon disul- phide and carbon tetrachloride. Where infestation is general throughout a house or is serious in closets, it is advisable to fumigate with hydrocyanic acid gas or sulphur. But none of these fumigation methods should be performed by a person not instructed in their use. Another control measure is to store susceptible articles in cold-storage rooms where the temperature is 50 degrees Fah- renheit, or lower. The Japanese beetle has been successful in establishing quarters in this country. The adults attack important crops, such as the foliage and fruit of the apple, peach, and cherry trees, and grape, beans, clover, alfalfa and sweet corn. Since the insect is a strong flyer, its spread from year to year has been steady. Only in the summer of 1916, it was first discovered in the United States, near Riv- erton, N. J. The pest’s few natural ene- mies have allowed it to multiply amaz- ingly. It is now firmly established; on the other hand, it is being successfully curbed in the areas it has infested the longest time. In Japan, the beetle is not regarded as a serious pest, probably because it has its native parasites. But here, this insect has found ideal resorts for its depredations. It is known to feed on at least 200 differ- ent species of plants. The federal government enforces yearly quarantines, restricting the passage of nursery stock as well as farm produce. A scouting force operates over the eastern states and determines the spread of the insect from year to year. Mixtures of arsenate of lead are the most promising insecticides for use against the adult beetle. In his relentless war on insects, man seizes every device that may be applied to curbing wholesale devastation. The recent adoption of airplane equipment by agricultural interests is a case in point. In the last several years, a number of com- mercial firms have begun to specialize in the “air-dusting” industry. — | «me

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POPULAR MECHANICS 911 In the south, airplanes have been used successfully in fighting the boll weevil. At army cantonments, beach resorts and industrial centers, airplanes have eradi- cated mosquito-breeding haunts. And in a case just reported from Canada, vast timber lands were saved from the ravages of caterpillars by a pilot of the Ontario fiving service. The Canadian department of agriculture states that, over an area of eighty square miles dusted with poisonous chemicals, it is difficult to find a single caterpillar, whereas, before the dusting, from fifty to seventy pests could be found on a two- foot twig. TEST MACHINE FINDS DEFECTS IN FRONT END OF CAR Locating and correcting faulty aline- ment in the front end of the automobile without removing the wheels or other parts is made possible with a tester now available for garages. Front-wheel aline- ment, turning-range alinement, bent spin- dies or axles, wheel wobble, axle tilt, wheel camber, and kingpin or spindle-bolt pitch, all are shown by instruments on the machine, which also reveals when the de- fect has been corrected. The tester, on a rack, includes axle press, hydraulic jacks, camber and caster tool, axle level, wheel- alinement machine and a_ longitudinal sight and target. Locating front-end trou- bles takes only a few minutes with the tester, and they may be corrected on the This Apparatus Automatically Indicates Faulty Aline- ment of the Auto’s Front End rack without heating the axle or remov- ing the wheels. The equipment occupies small space and is portable. © Henry Miller Rare Specimen of the Stone Fish Which Closely Re- sembles Coral among Which It Lives RARE “STONE” FISH IS FOUND HIDING IN CORAL Two scientists visiting the Great Bar- rier Reef, Queensland, recently captured a specimen of the rare and poisonous stone fish whose camouflage so closely resem- bles the coral among which it lives that it often is mistaken for an inanimate stone It has poisonous spines, a scratch from which causes intense pain and, sometimes, death. Its skull-like head is distorted into a series of bumps and hollows of lemon- yellow, pock-marked with gray, while the spines also are yellowish. Body and fins are brown with yellow or red warts. The specimen died within a few hours and was presented to the Australian museum. TRAIN IS COOLED BY ICED AIR Ice-cooled railroad passenger cars have been tested successfully in France. An electric fan in the passenger coach blows air through a chamber filled with about half a ton of ice, the draft being con- trolled at will, to filter and cool the air. During tests, the temperature outside reg- istered from ninety-three to ninety-five degrees, but the passengers were cool and comfortable.

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ne et re ace a oe NE ae ET RRR 6 Ss SEE SAA NC I ek 912 POPULAR MECHANICS Drawing Showing How an Airplane Trailed a Carrier Pigeon to Its Home to Capture the Ingenious Blackmailer Employing the Bird AIRPLANE TRAPS BLACKMAILER BY TRAILING PIGEON German police have successfully em- ployed an airplane to foil a blackmail plot, although the criminal was ingenious enough to use a carrier pigeon in his op- erations. A Hamburg resident received a package containing the pigeon and a letter, instructing him to attach notes amounting to 5,000 marks to its neck and release it. Two’pilots in an airplane trailed the pigeon and photographed from the air the dove cote in a suburb on which it alighted. Confronted with this evidence, the criminal confessed. MUSIC TRANSFORMED TO LIGHT AS AID TO STUDENTS To aid music students in perfecting their technique, musical sounds have been transformed into ribbons of light that write their characteristics on a screen to give a moving picture of the sounds. If low, pure sounds are made, the strip of light ripples smoothly, but dis- cordant tones cause it to move irregularly and writhe like a serpent. For all graduations of har- mony there is a distinct wave, different for each sound, even down to dis- crepancies in tone too fine for the ear to distin- guish. The instrument used is a development of the “Osiso,” used for some time to photograph voice and music charac- teristics. The develop- ment consists in substi- tuting a moving picture for a still. In it is a mir- ror, vibrating under con- trol of an electrical cur- rent from a microphone that picks up the sounds to be pictured. The mir- ror reflects a beam of light through revolving mirrors, and by this means music students are given a pattern of a per- fect sound and attempt to reproduce it in the light. The instrument is so delicate that it even showed a record when a pi- anist struck his fingernails on the keys in playing, and is to be used extensively to calibrate the harmony of musical instru- ments. RUBBER BOOT FOR SHIFT LEVER PROTECTS CLOTHING Affording pro- tection from grease and oil around the shift lever of the auto- mobile, which fre- quently soils the clothing of the motorist, a rubber boot for this part of the car is now obtainable. The boot slips down over the base of the gear shift, without interfering with its action.

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POPULAR MECHANICS 913 e ARE YOU A GOOD DRIVER? AVOID THESE FAULTS it $- One out of every 120 or so people in 0 the United States will be involved in an id automobile accident next year, judging yr from: 1928 accident reports tabulated by r- Dr. Louis I. Dublin, of the Metropolitan ct Life Insurance company. In other words, h automobile-accident deaths and injuries S- are around a million a year. The United 10 States, which leads the world in the per- 1- centage of fatal accidents, with seventy- nt eight per 100,000 population, had 27,500 of automobile deaths in 1928, and 950,000 yr non-fatal injury cases. Widening roads to yh handle the increased auto traffic has failed, c- recent surveys show, to materially reduce D- accident totals because of the careless j- habits developed by drivers on the wider re high-speed pavements. Analysis of driv- r- ing faults on the wider well-marked high- n- ways, discloses the leading ones are strad- r- dling two lanes, which not only is dan- 1e gerous but reduces the capacity of the ds wide road to that of a narrower one; cut- r- ting across traffic from one lane to an- of other; forcing approaching cars into the ig ditch by straddling lanes; parking on the is pavement to make repairs and change re tires, and driving at low speed in center r- lanes, forcing faster cars to pass on the in right instead of the left. GET OUT OF YOUR LANE te a f 7 sail PULLING POWER OF HORSES IS “ MAINLY DUE TO WEIGHT 0 u- Large horses are better than small ones for pulling heavy loads, tests at the Illinois agricultural experiment station have dis- . closed, although many horse owners have R insisted that a “good little team” will out- pull a big one. Trials were made with 144 different teams, and accurate measure- ments of their performance taken with a dynamometer. It was also found that a good disposition was an important factor in the animals’ success as pullers, and skillful driving was shown to be as neces- sary as good horses. Unshod animals were unable to hold their own against well-shod teams. It was also proved that horses must be in good flesh to do their best. One team’s performance was the equivalent of starting a load of 38,960 pounds for fifteen or twenty consecutive . ; Here Are Posed Pictures Showing Five of the Com- a times on a granite-block pavement. monest Causes of Automobile Accidents

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Fly ny By J. EARLE MILLER FEW weeks ago an air plane circled a time or two over a little unmapped lake in the wilds of far northern Saskatchewan, the roar of its motor died away to a soft purr as the pilot “cut the gun’’ and it swooped down to come to rest, straddling high above the water on the tall, stilt- like legs that supported the cabin fuselage above the seaplane pontoons. The pilot cracked the throttle a trifle, the song of the big “Wasp” engine picked up an octave or two, and the Fokker taxied ashore, until the pontoons were wedged for a quarter of their length on the sandy beach. Out of the cabin stepped a mining engineer whose curiosity had brought him out from Winnipeg to learn why Indians had given the little lake a name that means, in English, rot- tenstone. The little lake was Eskimo Girl with a Pair of Malamute Pups Too Small for Sled Training, and a Fairchild Plane of the Hudson Strait Patrol Being Towed from the Hangar by a Tractor 914

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Fairchild, Belonging to Northern Aerial Minerals Exploration, on the Banks of the Laird during a Prospect- ing Trip into the Far Northwest and across the Barren Lands sO unimportant it doesn’t appear even on mining maps of the district. As the engineer stepped ashore, directly in front of him, on the north bank of the lake, rose a low mound, shaped like a domed anthill, thirty-five feet high and 165 feet in diameter. Its almost bare sides were dull green and gray, the “green- stone” of the Canadian prospector, the only rock formation in which important ore finds have been made, the pre-Cam- brian shield, the oldest stone in the north country, so old that its weathered seams and strata have chipped and cracked and broken, and let the gold and silver, plati- num, copper, nickel and zinc, and the lead extrusions force their way through. And that was the answer to the enigma of the lake’s name, a vast mound of aged and rotted stone. A few hours’ work collected a bagful of samples, so rich that the naked eye could almost estimate their value. The entire mound was one vast heap of wealth, piled up in plain sight, not under the ground like most mines, but set out where anyone passing by for many centuries might have seen it. Those samples as- sayed $40 to the ton, forty dollars of gold, copper, nickel, platinum and zinc. With the exception of cobalt, lead and silver, everyone of the important metallic min- erals of Canada was represented. In this one story is summarized all the main facts of a revolution in mining, a revolution that has, in three years, put Canada to the forefront as one of the greatest mining areas in the world; a rev- olution that brought a new form of trans- portation to prospecting, combined flying and gold hunting and moved the clock of time forward at least fifty years. Two years ago one of the oldest forms of transportation, the canoe, reigned su- preme in all the vast stretch of country from the north line of the Canadian Na- tional to the Arctic ocean in summer, and the dog team did the same in winter. To- day, except for short local journeys, the dog team and the birchbark or canvas ca- noe are almost as rare as horses on Fifth avenue, New York, Michigan avenue, Chi- cago, or Market street, San Francisco. The story of the discovery of Rotten- stone lake is romantic and unusual only because it came from a “hunch,” from the 915

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oe ee ne ee mr trance 916 POPULAR MECHANICS curiosity of a man: in a distant city of- fice, who suspected the Indians had some good reason for giving the lake the name they did. The rest of the story, the use of an airplane to do in less than one day what would have taken a party of guides and prospectors an en- tire summer to accom- plish by canoe, is just one of dozens of similar stories. By air you can hop off after breakfast, fly two or three hundred miles out from civiliza- tion, knock off a few samples of greenstone with a geologist’s ham- mer, and fly back home in time to have them as- sayed before supper. Hundreds of men—pros- pectors, geologists, min- ing engineers and min- ing-syndicate scouts—are doing this, and, in fact, are doing it practically every day. At the time this is be- ing written, the annual report on mineral pro- duction in the Dominion of Canada in 1928 was not completed, but a preliminary report, pub- lished by the Dominion bureau of statistics, shows $273,446,864 was extracted from the ground last year, and the surface has hardly been scratched. The vast pre-Cambrian shield stretches over a large part of the north country, and it is in this oldest of rocks that the precious minerals are found. Canada contains ninety per cent of all the pre-Cambrian shield in the entire world. The other ten per cent stretches south of the border into Michigan and Min- nesota. From that ten per cent, with intensive prospect- ing, the United —— _ Top, Using an Eiderdown Sleeping Bag to Shield the Motor While Heating the Oil; Center, Cleaning Snow from a Fokker’s Wing, and, Bottom, Chang- ing Wheels to Skis

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POPULAR MECHANICS The Evolution of Land and Water Trans- portation; Top, York Boats of the Hud- son’s Bay Company under Sail on the Bay, and, Center, Bullock Carts Used for Transport on the Portages between Lakes and Rivers; Although Canada Is Studded with Thousands of Rivers and Lakes, the Connecting Portages and Those around Rapids and Falls Have Always Proved a Difficult Problem In Winter a Tractor with a String of Cars on Sleds Can Move Fifty Tons of Freight over the Snow and Maintain a Regular Schedule Day and Night

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918 POPULAR MECHANICS Planting the “Discovery Post” on a Mining Claim in Northern Ontario; the Next Step Is a Dash to the Min- ing Recorder’s Office Somewhere along the Railroad to Record the Find States has developed the marvelously rich iron mines of the Messaba range, and the fabulously wealthy copper mines of the Calumet district, in upper Michigan. If, say Canadian geologists, mining engi- neers and prospectors of the United States, with only ten per cent of the pre- Cambrian rock, can take out the wealth of Messaba and Calumet, what can’t Can- ada do with the other ninety per cent? Kipling once wrote of aviation that the world had reached the opening verse of the opening page of the chapter of endless possibilities, or words to that effect. That is the status of Canada today as a mineral producer. All the four billion dollars’ worth of minerals, taken out of her ground in the past half century or more, represent only samples picked here and there from a mineralized land so vast that a great part of it has never been mapped, and, until the airplane came, had never even been seen by white men’s eyes. In 1915 a party of half a dozen old-time prospectors, led by Jack Hammell, pad- died out from the end of steel at The Pas to see what they could find to the northwest. With huge thirty-foot birch- barks, capable of carrying four tons of men and supplies, and a crew of Indian helpers to paddle and portage the supplies from lake to lake, they swung up the Sas- katchewan almost before the last ice floes had cleared the river, turned north at the old Hudson’s Bay post of Cumberland House, spread big square sails and skimmed along before the wind through the chain of lakes to what is now Stur- geon Landing, turned west again, up- stream and over portages around rapids, until they reached Amisk lake, crossed it and portaged again into Athapapuskow lake, and on its north shore made camp. There, something like a hundred miles from The Pas as a bird flies, they staked claims that it has taken just fourteen years to develop. They had to fight and win a provincial election to interest the Manitoba government, for the claims were hardly a stone’s throw east of the Mani- toba-Saskatchewan border. Then, turn- ing the birchbarks and Indian canoemen again, they had to transport an entire provincial legislature through the miles of lakes and rivers and show them the spot before they could convince the law- __ Fone

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POPULAR MECHANICS 919 makers that Manitoba really had a future as a mining center. And finally they got a railroad in, a branch line leading off from the Hudson Bay road north of The Pas, and the branch was opened for serv- ice in the last week of July of this year, though equipment for the mill had already been transported in before the ballast had been completed. Fourteen years of work, and these claims, now in the hands of the Whitney syndicate of New York, are do-: Flyer in Winter Garb Ready to Take Off on the Hudson Straits Ice Patrol in the Far North Typical Bush Country; from the Air It Looks Like Rolling Meadows, But Actually It Is Almost Impene- trable Jungle of Jack Pine, Tamarack and Birch; Be- low, the Modern Surveyor’s Instrument Is a Camera ing development work that will represent an investment of $50,000,000 before much ore is taken from the ground. In the winter of 1925-26, Lorne Howey and his brother staked their discovery claim at Red lake and started the wildest gold rush the north country has seen since Klondike days. The Red lake district lies a hundred miles or so, as a bird flies, from civilization, as represented by the little trading post, flag-stop town of Hud- son, on the northern line of the Canadian National, some 240 miles east of Winni- peg, and about the same distance north of Duluth, Minn. Leaving his brother to watch the claim, Howey trekked out to the railroad, and

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920 POPULAR got word through to his old friend, Jack Hammell. With the fastest dog team they could procure,they started, and in twelve days of grueling going reached Red lake and, after crosscut- ting and trenching through the snow to check the extent of the surface show- ing of ore, closed the deal whereby Hammell took over the development of the claim. News spreads fast even in the bush, and by that time prospectors were pouring in by the hun- dreds and the shores of Red lake were staked as far as the eye could see. They came by dog team and on snowshoes, carrying food packs on their backs, and in their wake came the first airplane. In that plane Hammell flew out to civiliza- tion in one hour over the route that had taken the fastest dog team twelve days to cover. From that day the future of flying in the north was assured. Gold has a lure for men, and, even though it is far from being the most use- ful mineral resource, a gold discovery in- variably brings a stampede, where the MECHANICS more prosaic minerals may pass almost unnoticed. Because of that eager search for it, it is only natural, perhaps, that the value of the gold output should exceed that of any other metallic mineral— $39,091,472 last year out of a total value all the metallics, from arsenic, bis- zinc. What They Wear in the Bush during Fly Season; Indian Comic Mask from One of the Canadian Tribes; Jack Hammell, Left, and “Sandy” McIntyre of $131,904,603 for and that list ranged muth, cadmium and cobalt, down through copper, gold, iron, lead, nickel, palladium and rhodium, to platinum, silver and _The whole min- ing industry of Canada, from gold to grindstones, and actinolite to vol- canic dust, which also has its place in commerce, rep- resents an _ invest- ment of $700,000,000 and gives. employ- ment to 85,000 a in > 2k ik 2

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t- 00 y- 00 on ; €s; POPULAR men. With $50,000,000 being spent on one modern mining plant at Flin Flon, and a total mining investment of only $700,000,- 000 in all Canada, some idea is gained of the relatively small extent to which the surface has been scratched. The lack of transportation, which has held lode-mining development to a nar- row fringe along the Great Lakes and St. Lawrence, and to a fairly small portion of British Columbia, is rapidly becoming a thing of the past, and with the develop- ment of lode mines, the invested capital will grow by leaps and bounds. The Klondike and the early mines in northern British Columbia and the adja- cent Peace river country were mainly placer developments, in which free gold is found scattered through alluvial gravel. Placer gold can be extracted with an in- vestment of a few dollars in a pick and shovel and pan; it can be washed out faster by being sluiced through wooden boxes with rows of riffles to trap the heavy metal; whole hill- sides can be washed away and into the sluice boxes with a giant nozzle, if suf- ficient water power is available; or a gold dredge may be used, but, re- MECHANICS 921 oe — ae ee Photos Courtesy Canadian WNa- tional and Canadian Pacific Railways, N. A. M. E., and Canadian Government Bureaus Prospectors Placing a Summer Cache in a Tree to Protect It from Bears, .and, Left, Sinking a Winter Shaft ment is fairly small. Compared with that, the extraction of the precious metal from hard rock requires an elaborate under- ground mine, with compressed-air drills, dynamite and a railway; an ex- gardless of the . Examining Rock Specimens from a Trench Cut across method, the invest- the Face of a Silver Vein, at Lorrain, Northern Ontario pensive mill to crush the rock to a fine powder, and i i t

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POPULAR MECHANICS Summer at the Entrance to Hudson Strait, with a Plane of the kce Patrol Coming In to Port Burwell; the Ice Does Not Leave the Cape Chidley Neighborhood until Early August, the Patrol Found Radio Operator at Port Bur- well, Where the Canadian Gov- ernment’s Ice Patrol Super- vised the Installation of Radio- Compass Stations for Future Navigation of the Bay; Below, One of the Patrol Ships Tak- ing Off from Wakeham Bay, Halfway between the Ends of the 500-Mile Strait Connecting Hudson Bay with the Atlantic

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POPULAR MECHANICS 923 finally an elaborate cyanide plant to separate the metal from the rock. All that entails an immense investment, and the bulk of the machinery makes some form of heavy transportation imperative. Consider the situation of Rot- tenstone lake. A_ million-dollar mound of $0-a-ton ore, heaped up on the lake shore, is a fine sight to contemplate, but if there is nothing more there, that mound may remain for many years to come, for in itself it is not suffi- cient to warrant building trans- portation in to the site, and, at present, packing even forty-dollar ore all the way to the railroad and then shipping it to a smelter, probably Trail, B. C., would not be a paying venture. But there are two hopeful things about Rottenstone. For one, the mother vein may be found, and prospectors and geolo- gists are there as this is being written, trying to trace it down. The hunt is complicated by curi- ously disarranged geological con- ditions. The mound rises almost from the shore of the lake. Behind it is a high ridge of granite, which precludes the possibility of the vein dipping in that di- rection. On the opposite side of the mound it might dip out under the lake, but all the prospecting done to date seems to in- dicate an incline which angles away to the right in an effort to pass around the granite ridge. The other hopeful factor is Lac La Ronge, sixty miles or so to the south. A wide vein of low-grade copper ore, three miles long and assaying $7 to the ton, has been discovered at this lake. Its extent indicates it may warrant building a rail- road from the end of steel at Paddock- wood, just north of Prince Albert, for $7 copper can be worked to advantage, if there is enough of it. With a railroad built as far as Lac La Ronge, a vein may yet be uncovered at Rottenstone to war- rant the additional sixty miles of tracks. These are some of the problems the prospector faces when he takes to the bush to hunt a mining claim. (To Be Continued Next Month) Folding Auto Table for the Tourist, Which Attaches to the Back f of the Front Seat and Is without Legs COLLAPSIBLE TABLE FOR AUTO ATTACHES TO FRONT SEAT Added convenience for the tourist or camper is afforded by a folding auto table which attaches to the robe rail, robe cord or to special loops that fasten to the back of the front seat. The table, sixteen by twenty-eight inches in size, will carry a portable typewriter and is suitable for lunches, or for writing in the car. There are no legs, and, when collapsed, it folds into a compact bundle to be inserted into a case and is slipped under the seat. AIRWAY LIGHTS IN U.S. COVER TEN THOUSAND MILES Airway lights in the United States now cover 10,180 miles and additional 2,085 miles are being equipped with beacons. There are 263 intermediate landing fields, 1,406 airway beacons, 164 weather-report- ing stations, twenty-seven communication stations and seven radio range beacons on the country’s airways. | ; | ] i |

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924 POPULAR MECHANICS Bandit Cars Being Identified by Comparing “Finger- printed” Tire Treads with Tire Specifications FINGERPRINT AUTO-TIRE TREAD TO CATCH CAR THIEVES Identifying bandit automobiles by their “fingerprints,” the marks left by their tires, has been undertaken by the Los Angeles sheriff's office with successful re- sults. There are about 450 patterns of tires in existence, and methods of photo- graphing tire treads for identification pur- poses heretofore had to be worked out with the aid of a mathematician who had to figure the focal length of the lens, the height at which the camera was set, and other data. Los Angeles authorities place a try-square on the imprint of the tread, and the picture of the imprint and the square provide a means of showing the tire size, if other information is available for comparison. Such pictures reveal the size and make of the tire and the diameter of the wheel, and when com- pared with specifications from the tire manufac- turers, it is often possible to tell the kind of car, the load it carried, the approximate mileage, and whether it has been used mostly for country or city driving. “ELECTRIC SHADOW” OF PLANE IS USED FOR RADIO “We are now passing over Gunpowder river; altitude 2,400 feet; speed, 100 miles per hour.” This was just a plane radio message like thousands floating down from the air to the earth every day. Yet it opened a new epoch in radio communi- cation between a plane flying and the ground. It marked the first utilization of the “electric shadow” of a plane and ended the costly practice of shielding and bonding airplane ‘motors—making them electrical units—to prevent interference with ground communication from the air. C, Francis Jenkins, noted inventor, is dis- coverer of the electric shadow, a fan- shaped non-interference field at the rear of a plane with reference to its motor’s electrical high-tension wires. As_ ex- plained by Mr. Jenkins: “We have dis- covered that an electrical shadow follows an airplane, opening out fan-wise from its body to the rear, in which there is no interference from the high-tension wires of the motor. In this shadow we tow our antenna. Here perfect reception and transmission are possible. Bonding and shielding, therefore, may be done away with.” In proof of his theory, Mr. Jen- kins made two flights in an unbonded and unshielded plane, and no difficulty in transmission or reception was encoun- m™ co «& «- = an hn af ob ab O06

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d d POPULAR MECHANICS tered at any time. The antenna for the test was made fast to the top of the airplane rudder. It was reeled from the fuse- lage through a guide at- tached to the rudder. A wind cone “canvas arm sock” carried it back 125 feet. The non-interfer- ence field has been deter- mined to extend 1,500 feet behind a plane. The shielding and bonding of an airplane motor costs over $1,000. That cost is now eliminated, and also the danger of elec- tric leaks. TOOL MARKS BLIND HOLES FOR SCREWS Elaborate layout and uncertain guesswork in locating blind screw holes are eliminated by a sim- ple combination called a thread-button set. Each “button” consists of a hardened screw, similar to a headless setscrew, with a hexagon-shaped projection on one end. The end of the hex- ©P.&A. agon is shaped into a cen- This Exact none a Big Ocean Liner Is the Pride of a Crew of Boys in ter-punch point. In use, the buttons are screwed into the part con- taining the blind holes, with the marking points out. This part is then laid in posi- tion over the piece in which are to be drilled the holes for the bodies of the screws and tapped with a hammer. The points of the buttons mark the centers of the body holes. The set of buttons is held, when not in use, in a handle, which also forms the socket wrench for the purpose of placing them. lin, Who Man the Trim-Looking Craft BOY-SIZE OCEAN-LINER MODEL IS EXACT MINIATURE Modeled along the exact lines of a big ocean liner, a miniature giant of the seas has been built in Berlin. The little ship . is manned by a crew of boys. BLUE RATS ARE LATEST If you see a blue rat, don’t be alarmed. Dr. Elmer Roberts, of the University of Illinois, reports the appearance of a blue strain of rats among those kept at the laboratories for experiments. Inasmuch as this color has never before been ob- served in several generations of the rats, it is believed to be of evolutionary character. SS A eS

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926 POPULAR MECHANICS FLYING SKYROCKET BLAZES WAY ACROSS THE SKY Artist's Drawing of the Fireworks Plane in Flight, and Insets Giving Close Views of the Rack and the Falls Being Inserted; Man Facing the Pilot Fires the Flares by Pressing Electric Buttons An airplane has been designed to spray fire- works across the night sky. Its operation was explained at the Stewart Aircraft company’s han- gar by William A. But- ters and his assistant, Dale F. Dryer. The plane carries twelve “falls” and three magnesium flares on each side, in special racks that have been at- tached to the lower wing. Falls are like Roman can- dies without the balls, Pilot Butters explained, and they are set off by means of electrical con- tact through wiring from a six-volt storage battery. There are eight switches in all, four for each side of the plane, and they are installed where Dryer, who sits in the middle seat of the three-place ship and faces Butters in the rear cockpit, can eas- ily reach them to set off the fireworks. Butters keeps his eyes from the brilliant display or he would be temporarily blinded and handicapped in maneuvering the plane, which is put through loops, spins and other stunts. From his posi- tion, Dryer is able to tell at once when a piece has been burned up. Pressing another switch sends the current that sets off the next flare or fall. Dur- ing the exhibition, a wind-driven siren, which can be shut off or turned on at will, attracts the at- tention of all those of the crowd who at first are not aware of the presence of the spectacular “comet on wings.”

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POPULAR MECHANICS The Towers at Each Side of the Royal Gorge, on Which Will Rest the Highest Suspension Bridge in the World; It Will Be 1,052 Feet above the Arkansas River HIGHEST BRIDGE IN THE WORLD TO SPAN ROYAL GORGE With an altitude of 1,052 feet, the bridge now being constructed over the, top of the Royal Gorge, near Canon City, Colo., will be the highest suspension bridge in the world, reaching more than twice the height of its nearest rival, which is in southern France. The length of the main span of the Grand Canon bridge will be 880 feet, and the total length 1,260 feet. From its eighteen- gained by the fact that two Washington monuments could be placed end on end under the structure, yet not reach the bridge. ALINEMENT OF AUTO’S WHEELS SHOWN ON DIAL Checking faulty alinement of automo- bile wheels is made easy with an indicator being installed in service stations. The customer is enabled to check his own wheels by driving foot roadway may be seen the waters of the Arkansas river far below, and tracks of one of the western railroads. Steel towers on each side of the gorge rise 150 feet, and two cables, each nine inches in diameter, will have a strength of 120,000 pounds per square onto a plaform re- sembling a scale, and glancing at a dial, the hand of which indicates the number of feet side slip due to wheels being in or out. Attention is called to excessive mis- alinement by a bell. The front wheels are tested first, and then the rear wheels inch. Some idea of its height can be Faulty Alinement of Auto Wheels Is Shown by Driving on the Platform and Reading the Dial are run onto the platform.

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928 POPULAR MECHANICS “BLIND” PILOT PAVES WAY TO CONQUEST OF FOG Foreshadowing the time when fog, man’s greatest enemy in the air, will be defeated, Lieut. James H. Doolittle, army flyer, recently took off, flew over a fifteen- mile course, and landed a plane without once seeing outside the cockpit. The “blind” flight, sponsored by the Daniel Guggenheim Fund for the Promotion of Aeronautics, marked the first instance in which a pilot negotiated a complete flight from take-off to landing by relying on nothing but the instrument board in front of him. An emergency pilot was ready to take over the dual controls at any time the flyer in the shrouded cabin encoun- tered difficulties, but his services were not required. The instruments by which Lieu- The Covered Cockpit in Which a Pilot Made a “Blind” Flight, and Instruments Which Guided Him tenant Doolittle was able to perform the feat comprised only three beyond those used in everyday flying. These were a barometric height indicator registering in ten-foot units instead of 100 feet, a gyro- scopic direction indicator and a special artificial horizon which at all times shows the plane’s position with relation to the ground. The two latter instruments en- abled the blind pilot to make a perfect turn, a landing, or any maneuver normally accomplished in daylight. A radio re- ceiver of the vibrating-reed type kept the pilot on a definite course, the right or left reed vibrating excessively as he deviated. The radio was capable of two-way com munication, and the pilot sent messages to the radio-beacon station on the ground during his flight. While still in the ex- perimental stage, it is hoped that the in- struments will form the basis for making flights of the future independent of weather or visibility conditions. @ There are deposits of coal in the ant- arctic regions.

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POPULAR MECHANICS 929 HOLE IS BORED TO CANADA FOR MOTOR CARS Boring under the Detroit river to link Detroit and Windsor, Ont., by a tunnel which will accommodate 2,000 automo- biles an hour is being accomplished with- out disturbing traffic in the streets or jeopardizing adjacent buildings. An army of workmen is pushing its way through the ground behind the protection of a gi- gantic steel shield. The shield is a cir- cular steel face pressing against the clay that is to be dug away. Behind it the men, known as “sandhogs,” dig through slots in the shield until enough earth has been removed to allow hydraulic jacks to push it forward eight inches. To pro- tect the workers against cave-ins, the in- side of the tube is steel-lined as it moves forward, this being done by a circular arm which swings inside the shield, carrying a steel band that is clamped in place and welded much like a barrel hoop. The un- derwater section of the tunnel is formed by steel tubes, weighing 4,000 tons each, sunk and concreted together. FILLING STATION FOR PLANES AT LONDON AERODROME British aviators using the Hanworth aerodrome, near London, may fill up their gasoline tanks in the same manner as the motorist. The field is equipped with fill- ing stations, a line on an extension run- ning from the pump by an overhead sup- port to the plane. The airport caters to private owners and gives them instruction in flying their ships. This Cabinet Contains Apparatus for Imitating a Score of Sounds in Radio Broadcasting QUEER RADIO SOUND EFFECTS ARE MADE TO ORDER Noise makers and amplifiers capable of producing twenty different sound effects frequently used in radio broadcasting are contained in a single cabinet employed in some radio studios. The apparatus re- sembles an ordinary radio cabinet, except that, along one side, are push buttons, cords, cranks and levers. Inside are dry cells operating electric bells, a hollow cyl- inder filled with sand, an electric fan, a large horn and several other sound-pro- ducing instruments. Among the effects are bells of every type from the ringing of the telephone to the gong at the prize fight; a vast miscellany of whistles, from fog horns to loco- motives, the roar of a lo- comotive, the whir of an aeroplane,and the sounds made by automobiles and galloping horses. Dog barks, the roar of the lion and the sounds of falling water and beating surf also are imitated. @The average life of a A British Airport Equipped with Stations Where the Aviator May Fill His Tanks Just as the Motorist Does passenger automobile is seven years.

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_J\ leehine | \ \ py? tone Dr. John A. Larsen Using the “Lie Detector,” and Re- production of Some of the Instrument’s Records of a Subject’s Emotional Reactions 930 By H. H. DUNN IVILIZATION of the future must look to science for its protection from crime.” August Vollmer speaking, at his desk in Berkeley, Calif., where he has created and established what is said to be the only “scientific police force” in the world, with such success that crime has been pre- vented, acts against life and property checked, and young boys and girls of way- ward bent turned back to lives of honesty. This fall, Chief Vollmer became head of the department of police science in the first college of criminology in the world, just established by the University of Chicago. Six months of each year he will direct this department and the other half year he will be found in headquarters at Berkeley. “The policeman of the future, whether patrolman or detective, will be a trained scientist,” continued the chief. “If we are to stem the current of crime, we must do it by scientific methods, and this is what the University of Chicago aims to accomplish.

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one : } ' 5 “We are turning to the study of the mechanics of crime and the mentality of criminals for the control and correction of the anti-social individual. The: collection and co-ordination of statistics will form the basis of this work.” While Chief Vollmer looks to preven- tion as the ultimate remedy for crime in the abstract, he realizes that, under pres- ent conditions, the immediate necessity is an understanding of the mechanics of crime—how the criminal does his work and how each criminal worker may be found, identified, convicted, and his fur- ther operations checked. For this, he turns to the laboratory and the technical workshop, as he turned with his force of policemen in the city of approximately 100,000 inhabitants, where he is at the head of the department. “The University of Chicago plans to set up the preliminary machinery for the plac- ing on a scientific basis of the detection and prevention of crime,” the chief con- tinued. “There, men will be prepared with scientific training to be professional Improved Apparatus for Taking Identification Photo- graphs, and Coroner Herman N. Bundesen Seeking Bullet Clues in Stump 931

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932 POPULAR MECHANICS “From the experiences of hundreds of police de- partments all over the world, we shall be able to deduce laws for the distribution of the police force in any city—a most important factor in the prevention of crime. From microscopic, pho- tographic and laboratory work on dust, hair, finger nails, fibers, foods, tobac- co and drugs, will come improved methods police officials. Mentally, physically and morally, they will be educated as officers of the police ‘army’ of American cities, just as men are trained at West oa Point and Annapo- lis to lead our fight- ing forces in time of war. At first, there will be offered a course in police organization and administration; then will come a de- partment of police science, and even- tually a college of criminology— of identification. In the future, we shall have patrolmen ca- pable of going into the laboratory and making their own tests, with perfect assurance that they will obtain correct results. “By means of the lie detector, devised - by Dr. John A. Larsen, simple and easily applied de- ception tests will be developed, and undoubtedly also other means discov- though it may not bear exactly this title. To science alone may we look for the laws which gov- ern crime. For instance, we know that back of every so-called ‘crime-wave,’ there is a reason; what that reason is we do not know, but after long com- parison of correct statistics on em- ployment, housing, living costs, wages, and many other factors, we will be able to deduce a law which will tell us not only why a series of crimes has been com- mitted in any given community, but ap- proximately when another such series is most likely to occur. Inspector Charles P. Carmody, of Detroit, with Mur- derer’s Palm Print; and Paint and Bolt Clues in an Auto Death

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POPULAR MECHANICS 933 ered whereby criminals may be made to reveal themselves and their ac- tivities. The identifica- tion of criminals is in its infancy as a science, but it is a field in which ac- curate, unsentimental, mechanical equipment will play an ever-increas- ing part. The study of weapons and implements used in crimes against life and property forms another avenue leading to identification, a high- way on which we have only recently entered. “Tt is probable that ra- cial characteristics, as well as individual iden- tity, are revealed by fin- gerprints. We are begin- ning to believe that there is hereditary transmission of fingerprints, to such an extent, at least, that lines of descent may be traced. Careful comparison and tech- nical study of these marks alone will es- tablish the laws which govern them, and only in research institutions, where all scientific equipment is available, can such studies be made. “With the microscope and the camera united for micro-photography, handwrit- ing identification and classification—some- what similar to the much-needed single- fingerprint classification and co-ordination —will be established. Undoubtedly, back of all handwriting there are certain laws, about which as yet we know little or noth- ing. Only by mechanical means, possibly by the use of instruments not yet devised, will we be able to learn these laws. “The vast field of ‘methods’ of criminals —considered so important that California has established a state bureau for the col- lection and preservation of its records— is the province of the mechanician. When we have in our files the record telling ex- actly how every known criminal operates, we shall be able to trace every crime im- mediately to the person who committed it. It is well known that every safe blower, for example, has his own method of opening strong boxes, differing in some Mrs. Millicent Cooper, of Lewistown, Mont., an Expert in the Identification and Classification of Fingerprints constant detail from that of every other safe blower. Virtually every crime against property bears in itself an identification of the criminal. To a slightly less extent, every murder for gain, that is to say, every killing in a holdup, robbery, or burglary, also carries the trade-mark of the killer. “The automobile has brought to crime a tremendous aid. Traffic regulation is by no means the only automotive problem with which the police have to deal, though this will be studied and taught. Closer checking of purchases, titles, ownership and operation of all forms of automotive vehicles must be made. Probably we shall arrive at the point where the known criminal will be forbidden to own or drive an automobile, so that when found driv- ing, he may be ‘picked up.’ Without doubt, many crimes could be forestalled by such a legal weapon in the hands of policemen, particularly traffic officers and highway patrolmen. “What we really need, however, is a systematic nation-wide method for the prevention of crime in its early stages, in place of the often futile attempts to reform criminals after they are well started on their devious careers. Our police school for wayward boys, conducted by Frank

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934 POPULAR MECHANICS Waterbury, of the Berkeley police depart- ment, has been highly successful, and could be applied to any city in this coun- try. The woman in crime presents an in- creasingly serious problem to every police department. More clever and less easily trapped than man, it is almost imperative that her activities be checked while she is in the adolescent stage. Scientific analysis of the ‘underminded girl’ from which class is drawn the greater part of the women in crime, will reduce that problem.” Beyond the prevention and detection of crime, however, the University of Chi- cago is preparing to develop an advisory bureau of police activities for the aid of every American mu- nicipality. While the university trains men for the position of police executive, this bureau will take up the crime problem of any city and help that community’s po- lice itself to solve the crook question. The primary purpose of the university in tak- ing August Vollmer to its new college, is ' to organize police work and put it ona business basis, so that, eventually, every American city will have a scientific police force, and will co-operate with every other city in the prevention of crime and the elimination of the criminal, rather than, as now, merely in the suppression of his activities. “The plan in a nutshell,” said the chief, “is to put the police in the same position in the fight on crime as the physicians of America occupy in their constant battle against disease. Realizing that only by the aid of the mental and physical sciences can we hope to protect society from the crook, we are approaching the problem with open minds. The men at the head of this college of criminology must first establish definite principles—battle plans of crime—and these can be obtained only through long study and compari- son of data on crimi- nal activities from every community in this country. Hence, the new _ police-sci- ence institution will be, first of all, a huge research laboratory, mental and mechani- cal, and, second, a school for the train- ing of men who will be able, from the in- formation obtained in the laboratory, to carry on the cam- paign against the ‘disease’ of crime. Above, Two Shells Fired from Same Pistol to Show Identical Markings, and, Below, Test and Fatal Shells in Detroit Holdup Case; They Led to the Murderer’s Confession mae A a

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POPULAR “Apparently there is a direct relation between the number of automobile regis- trations and the number of robberies of all kinds in every city. There seems to be a relativity between the comparative employment of women and men in a com- munity, and the number of crimes com- mitted there. It is stiggested that there is a traceable relationship between the prosperity of a city and the number of crimes against property. But at present we do not know the laws governing these relationships. That there are such laws, there can be little doubt, and when we know them, we shall know not only with what kind of crimes but what sort of criminals we shall have to deal in every community. Moreover—and this is equally important—we shall know approximately when, in the future, we shall be confronted with a series of crook activities.” TRI-CORNERED CHUTE REDUCES LANDING SHOCKS Slower landing speed with resulting de- crease in the shock and improved maneu- verability are features claimed for a tri- angular parachute developed by Maj. E. L. Hoffman and tested with satisfactory re- sults at Wright ‘field, the Cleveland air- port, and other places. The principle of operation remains practically unchanged as to the method of opening and other details, but instead of being round, the new parachute has two rounded corners, while the third is straight. There are no shroud lines across this square corner, which thus forms MECHANICS 935 GUN THAT PATCHES SUBMARINE ALSO AIDS IN RESCUES A “Fixer” Which Plugs a Hole in a Submarine as Easily as an Inner Tube Is Patched Holes in sunken submarines can be repaired about as quickly as a patch is placed on an inner tube, according to re- ports, with a submarine “fixer” recently introduced and tested at the navy yards. It weighs fifteen pounds, is about two feet long, and, working on the principle of high explosives, although it is said to make no loud noise and is safe to use, drives steel pins through the steel of the submarine so that a patch can be tacked on in a short time. Navy experts point out that the device can be used in different ways. In case men a tail-like vent through which the air can escape, en- abling the canopy to be propelled hor- izontally at varying speeds according to wind conditions and the action of the jumper. The chute is also said to swing but little, the pilot parachute has no springs and, when folded up, it is said are trapped inside the hull, hollow pins could be driven through the hull so that liquid foods could be given to the prisoners or signals could be ex- changed. The fixer is easy to use. It shoots a steel pin three and one-half inches long and half an inch in diameter through to be more com- fortable to wear. A Tri-Cornered Parachute Which Is Able to Land at a Lower Speed Than the Round Ones the five-eighths- inch side of a sub.

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936 POPULAR MECHANICS THESE TUBES DO WORK OF THREE HUNDRED BOYS Pneumatic Tubes in a New York Office Building Which Handle over 20,000 Messages Daily, a Task That Would Require the Full Time of More Than 300 Messenger Boys Pneumatic tubes are being employed to do the work of messenger boys, particu- larly in large office buildings. The New York Life Insurance building, in New York, is equipped with pneumatic tubes which shoot the leather carriers contain- ing the messages up seventeen floors in seven seconds. Thirty-six operators are required to man the tubes, which deliver more than 20,000 messages daily between various departments, a task that would require the employment of 300 messenger boys. The tubes go to the basement, where all messages are rerouted and sent on their way in other tubes. Telegraph companies have pneumatic tubes, extend- ing over many miles, connecting their branch offices in some of the larger cities, and newspapers are in communication with press-association offices in like man- ner, the news of the day flashing into the newspaper offices after traveling. under the streets in the pneumatic carriers, often at a speed of fifty miles per hour. Some of the underground tubes used by tele- graph companies have been operating efficiently for more than fifty years. PROFIT IN TIN CANS Salvaging millions of tin cans around western mining camps has been found a profitable business. The process recovers both the tin and the steel, an average of three tons of tin being recovered weekly and molded into ingots to be used for making new cans. The labels are removed by a mangling and shredding machine, the tins are crushed and put through an in- cinerator, and then go into a chute of churning water from which they pass to a vat of caustic solution which separates the tin from the steel. The steel then is pressed into compact form for shipping.

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POPULAR MECHANICS 937 ICE WELL IS GOOD REFRIGERATOR FOR DAIRY Ice wells for cooling and storing milk and cream on the dairy farm where the usual methods are too expensive or im- practicable, have been tested with satisfac- tory results by the North Dakota Agricultural col- lege. The ice well con- sists primarily of a pit in the ground in which a large solid cake of ice is formed by running a small quantity of water into the hole daily during freezing weather. The spot selected should be well drained and near both well and milk house. The experimental well was eight feet square and nine and one-half feet deep with boarded sides and gravel bottom, a small house being erected over it. During the win- ter months a solid cake of ice, eight feet square and six and one- half feet deep, was frozen. Storage was started in May and fifty-eight cubic feet of ice still was left in September. SHELF BRACKET FOR RADIATOR GIVES EXTRA TABLE SPACE Radiator shelf brackets now are on the market to make available the heretofore waste space on top of radiators. One bracket serves a radiator of three or four sections, and two care for that of ordinary width. The brackets are attached by wing- nuts, and may be extended or con- tracted to the width of the radiator. They may be used to transform radia- tors into tables for various purposes, Sound Waves from a Siren aboard This Airplane Operated to Turn on Searchlights on the Landing Field 2,000 Feet Below LIGHTS TURNED ON BY SIREN ON SPEEDING PLANE Operation of sound-control apparatus, which enables aviators to turn on the lights of air ports while high over landing fields, has been successfully demonstrated by engineers of the Westinghouse Elec- tric and Manufacturing company. In the tests, a big horn, resembling those used on old-fashioned radio loud speakers, carried the sound from the siren, 2,000 feet above the earth, to the delicate control appara- tus. This apparatus clicked softly, and immediately the huge searchlights blazed forth, throw- ing beams of light that could be seen for miles. Since only one tone operates the control appara- window seats or book shelves. tus, all other noises have no effect. Shelf Brackets for the Radiator Which Transform It into a Table or Window Seat

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Above, a Steersman, Guiding a Steam Tug into Port by I sae, z. ¢ Blindfolded, ds of Diaph g to P near the Harbor Entrance; This Device Aids Boats in Entering and Leaving Ports during Foggy Weather dventures « By HAROLD T. WILKINS ROUND the walls of a room known as the “Graveyard” in the Royal Exchange, the home of the famous shipping corporation of Lloyd’s, London, are many hundreds of green- backed volumes telling strange tales of adventures at sea. The records range back for more than a century, yet, even in these scientific days of transatlantic radio telephones from ship to shore, direction finders and echo-sounding devices against the perils of fog and The S. S. “Kershaw,” Being Raised after Catching Fire and Sinking, While Undergoing Repairs at Baltimore darkness, Lloyd’s are continually adding to these secret archives tales as true and strange as any ever written in the far- off days before the first paddle steamer 938

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Scene at British Inquiry into Sinking of the “‘Vestris” with a Loss of 114 Lives; Plans of the Liner Are Dis- played on the Walls; It Was Decided That the Vessel Was Overloaded churned the waters on the long track from Liverpool to New York. Many of these skeletons in Davy Jones’ cupboard are never revealed to newspaper readers. Some of them are in the shape of genuine bottle messages cast ashore years after a startling sea disaster. A few months ago, a man was walking at evening along the sands of a quiet bay, the Mum- bles of Swansea, South Wales, when he picked up a bottle containing a note, a gold scarfpin with a stone missing, and a photograph of two men. Said the writer: “This is the last moment the great ship ‘Titanic’ sank. I am left here with my brother-in-law, John Williams, wife, and little child Jean, having left the doomed ship on the last boat. The band are still playing, the officers are running here and there, although their tasks are hopeless; men are going mad, while. .[unreadable].” This tragic last message, so strangely cast up from Davy Jones’ graveyard in 1929, seventeen years afterward, throws light on the last moments of the liner “Ti- tanic,” which collided with an iceberg in mid-Atlantic on her maiden trip, on April 15, 1912, when she sank with 1,635 pas- sengers out of a total of 3,510 on board. On December 14, 1928, a steel three- masted barque, the Danish sailing ship “Kjobenhavn,” sailed from Montevideo, Uruguay, for Melbourne, Australia, with fifty naval cadets. Cables and radio re- ported ice floating in the southern ocean right along the track she would take. She was a 3,901-ton ship, said to be the world’s largest sailer, and carried no able-bodied seamen, but was to be handled by the cadets. Her radio had only a short range, and to reach shore stations messages would have to be relayed by passing ships. Auxiliary motor engines could have driven her one screw, in case of need. Seven days after she left Montevideo, she sent a message regarding her progress, then nothing more was heard. Next, on June 18, 1929, the cables hummed with a message when Capt. H. Kristensen of the motor ship “Mexico” came into Table bay, Cape Town, with a riddle to solve: 939

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940 POPULAR MECHANICS Above, Davit for Launching Lifeboat from German Liner “Bremen”; at Right, Method of Operation “T find that on January 21 last the ‘Kjo- ‘benhavn’ passed Tristan da Cunha, with her sail reduced to a single jib, and fore, lower and topsail. Other sails carefully stowed and furled. She came drifting on the current, a quarter of a mile off Tristan reef. Nobody was seen aboard, and her helm was unmanned. When she was near striking the reef, she turned and the cur- rent carried her into the mist, in which she vanished. It is as puzzling as the ‘Marie Celeste’ mystery. Either the ‘Kjobenhavn’ had been abandoned or her whole crew was down with disease or poisoning. The islanders are sure she was undamaged, but slightly down by the stern. I reckon she is still afloat or has been washed up on the desert coast of southwest Africa or in the Antarctic.” The tale of the “Eltham” steamer is a strange one. The villagers of the lonely Cornish hamlet of Chapel Porth woke up after a night of roaring gales and tumul- tuous seas, on November 18, 1928, and walked down in the gray dawn to the edge of granite cliffs, where they looked down on a steamer, lying 200 vards from the shore with a broken back. Fishermen put out in boats to the sub- merged wreck and found she was the “Eltham,” a 687-ton steamer owned by a Liverpool firm, and bound for Rouen, France, with a cargo of coal from Swansea, which she had left the previous Thurs- day. There was no sign of her crew, and coast- guards near by had seen no flares or rockets in the night. A few hours later, a smashed lifeboat, bearing the name “S. S. Eltham,” was washed ashore in a cove six miles away. Many small and storm- bound ships lay at anchor in near-by havens, but none had sighted the “Elt- ham” when they fled from the hurricane. Ten days later, the seas abated enough for a volunteer fisherman to board the wreck of the “Eltham” at low tide, with a life line tied to his waist. He found the steamer badly holed, but no logbooks or papers of any kind. Her anchors and chains were stowed away, but there was no ‘sign of any cargo. Fittings had been washed away, but engines and boiler were still intact, and there was nothing to show why the crew had abandoned her, save for the hole in her hull, which might have "#4. ene eee | - —

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POPULAR MECHANICS “Ff The Crew of Twenty-Five of the German Freighter “Quimistan,” Just before Their Rescue by a Steamer; the “Quimistan” Took Fire, and the Crew Spent Three Days in the Boat Shown been due to breakers on the shore. Was the “Eltham” deserted many miles away in mid-Atlantic, and did she drive derelict to her doom with no crew aboard? If so, what became of her cargo? “SOS. Urgent. Explosion!” was the startling message received by the French tug “Iroise,” waiting with steam up off Brest, in December, 1928. There was no statément of the distressed ship’s position, or her nationality or name, and the mys- tery remains as insolvable as the fate of the survivors of the American oil tanker “David C. Reid,” which, in the previous month, wirelessed the Leyland liner “Deli- lian” that she was sinking fast. The American tanker passed Gibraltar, at the southern tip of Spain, on October 6, 1928, on a voyage from Samarang, Java, to Phil- adelphia. When the Leyland liner reached the position given in the SOS, all she found was a great patch of oil on the ocean. Then there is the queer story of the 420-ton Latvian steamer “Laima,” missing since January 25, 1929, when it is supposed she was lost with all hands in a gale in the Baltic sea. No lifeboats or wreckage were ever found, and the theory is that the steamer became incased in ice, and was overwhelmed by gigantic waves. The Atlantic, in 1929, has maintained its reputation as Davy Jones’ graveyard. Dur- ing a tremendous gale and icy seas in Jan- uary, liners and freighters from all quar- ters were rushing to the aid of an Ameri- can tanker, an Italian freighter and the West Hartlepool cargo steamer, the “Tees- bridge.” At 5:30 on a Monday morning, the American freighter “Maine” heard a desperate SOS from the “Teesbridge,” then about 400 miles east of Cape Race, Newfoundland: “Water in stokehold. Two hatches stove in. Using emergency wire- less. Latitude 48.31 N, longitude 41 West.” The “Teesbridge” had a crew of thirty. When the captain of the “Maine” reached the spot, he saw no trace of the ship or wreckage and hung around till next day. A Belgian liner and a French freighter joined the search, with no better luck. No one knows if the position was wrongly reckoned by the “Teesbridge” or whether her wireless transmitter was put out of action after great seas had drifted her away from the position she indicated. A strange tale of an explosion heard at sea, off Yarmouth, England, on the night of Sunday, July 7, 1929, adds another grim

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942 POPULAR MECHANICS skeleton to Davy Jones’ cupboard. The captain of the Swedish steamer “Anne Berg” was in the chart room working out his course to pass a lightship, when he was struck motionless. “I heard a tremen- dous explosion reverberate across the water,” he said; “the helmsman shouted to me and I jumped up to the wheelhouse. I was just in time to see a vessel, about four miles away across the port bow, dis- appear into the sea. She went down at an angle of about sixty degrees, and I saw only the head and foc’sle of the ship. The rest of her had already gone down. We steered at full speed to the spot, reaching it in twenty minutes. There was no sign of wreckage—not a piece of wood or oil or anything. I reckoned, from what the helmsman told me, that she was a ship like our own, Swedish and about 3,000 tons. We sent out an SOS and-North Foreland wireless station told us a gunboat and a mine sweeper were rushing to the spot. We gave the exact position. About midnight, the British mine sweeper ‘Selkirk’ came alongside and hailed us, and we told her by Morse lamp that she was in the cor- rect position. We said we had seen noth- ing, and asked if we might proceed, and the ‘Selkirk’s’ commander wirelessed: ‘Yes, thank you very much.’ ” The gunboat and the mine sweeper searched the sea for hours without result. There also are “ghost ships” in Davy Jones’ graveyard. A Dutch liner, not long ago, reported boarding a tramp steamer in the vast Caribbean sea, which seemed derelict. The only living creature they found on board was a big retriever dog, frantic with fear. Down below, steam was still in the boilers but shut off from the engines, and in the chart room, a pen with the nib “still wet with ink,” was found in the pages of a logbook. The Netherlanders saw no signs of storm or strife, but two lifeboats and a skiff were missing. Then a French sailing ship, the “Emilie Gallieni,” was passing through the Straits of Magellan when she had an adventure which sounds like an episode from a novel. Icebergs and dancing green floes packed the waters and the captain was steering his ship gingerly toward clearer water when he saw a vast iceberg, and in a fissure, 120 feet above the sea, was entombed a big three-masted sailing ship, © Topical Press A Scene at Lloyd’s, London, Where the Records of Every Ship in the World Are Available and May Be Looked Up in the Index in Less Than One Minute

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POPULAR MECHANICS 943 all her sails and rigging intact and not a boat missing from her davits. The crew of the French ship shouted, but no re- sponse save the echoes of their own voices came from the weird berg. This incident may be contrasted with another true story. Let the reader imagine himself penned in a narrow steel tomb in a steamer’s engine room, under the boilers, while flames roar over him and he lies in water which grows hotter and hotter till it nears the boiling point. Such an incident actually occurred in October, 1928, on board the Blue Star oil tanker “Trojan Star” in mid-Pacific, bound for Vancouver. An oil jet burst and a rush of flame cut off eight of the en- gine and stokehold staff, who had to seek shelter in the bilges under the boiler, while for three hours they lay in oil and © London Daily Mail water, and flames roared above them. A Welsh fireman sang songs to keep up the spirits of the sufferers. Then a steam pipe burst and the escaping vapor smothered the flames. The strange tale of the liner “Waratah,” a new ship carrying 300 passengers and crew, which, in July, 1909, mysteriously vanished beween Durban and Cape Town, South Africa, right in the track of ten other steamers all of which safely reached port, had light thrown on it in May, 1929, when an Englishman wrote to a well- known London newspaper stating that, in 1913, he met a white trader at the mouth of the river Xora, near the native reserve of the Trans Kei, near East London, South Africa, who told a queer story. “One very wild night in July, 1909,” he said, “I saw a large steamer close inshore off a dangerous coast with terrific surf running on razor-edge reefs. Wondering what on The Submarine in the Middle, Pictured Shortly after It Had Collided with and Sunk Another British Sub earth she was doing in so dangerous a spot right off the steamer track, I went to my hut to get my night glasses, but on returning to the shore, I found the steamer had vanished. Three months later, I heard of the loss of the ‘Waratah.’ I am certain it was the same steamer. I have a piece of wood with the letters ‘War’ carved on it. A tremendous depth of water runs outside the reefs and it is quite conceivable that a ship could turn turtle and leave no trace. Sharks would kill any human being even if he or she could keep afloat in such strong tides.” One theory of the disappearance of the “Waratah” is that she was top-heavy, and went to the bottom, after turning turtle in a hurricane. @Coal has been found 800 miles north of the arctic circle.

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944 POPULAR MECHANICS DUMMY LEAPS FROM AIRPLANE TO TEST PARACHUTES A Dummy Dropped from an Airplane by German Avia- tors to Test New Parachutes German aviators have constructed a dummy to test their newly developed para- chutes. The dummy, with the parachute strapped to its back, is carried aloft fas- tened to a rope outside the plane, and when at the proper height, is released. The observers take notes on the time re- quired for the parachute to open and the manner in which the dummy lands. SPEEDWAY FOR AUTO TRAFFIC OVER RAILROAD Utilizing air rights over railroads for automobile-traffic speedway purposes is anticipated in Detroit, where the Grand Trunk system is planning a twenty-six- mile toll road above its tracks from De- troit to Pontiac, Mich. The total cost of the project, including electrification of that portion of the railroad, is expected to be $100,000,000. The plan includes con- struction of a four-track electrified rail- way surmounted by a forty-foot motor speedway, supported by steel pillars. Throughout its length, the highway will pass over streets and railroads, there be- ing no traffic lights to delay motorists. It is planned to divide the road into zones, the charge being based on the number of zones the motorist traverses. Four streams of traffic are anticipated, the inner one on each side being for high-speed travel. Traffic will enter and leave by ramps. CHINESE FISH WALKS ON LAND Home aquariums now may avail them- selves of a Chinese fish that is almost a landlubber. If taken from the water and placed on land, the fish crawls along the ground and, it is claimed, will cover half a mile in this fashion. The walking fish is several inches long and is beautifully colored, with a bright spot resembling an eye near the tail. SPHEROID SHAPE OF OIL TANK GIVES ADDED STRENGTH Oil tanks of spheroid design have been found by tests to be more economical and to be stronger than the cylindrical con- tainers for large-capacity requirements. The spheroid tank with flat bottom was designed to make the shape as near as pos- sible that taken by a flexible container under gas and liquid pressure, as illus- trated by partly filling a rubber balloon and placing it on a flat surface, whereupon it becomes a spheroid, circular in plan but with a flat bottom. In the ordinary cylin- drical tank, the bursting force is resisted by the vertical shell, but in the spheroid considerable pressure is transferred to the top and bottom of the container. High stress near the bottom was lessened by curving the container sharply there. "*@@h 2mm . Huge Oil Tanks of Spheroid Design Have Been Found Stronger Than Cylindrical Ones and sim] sign pur; hor: vide are truc oth mal the do’ vid ma wa wh Al

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POPULAR AUTO TRUCK HAULS SIX HORSES EACH IN OWN STALL Transporting horses and cattle by motor is simplified by a truck, de- signed especially for this purpose, which hauls six horses, each in an indi- vidual stall. The stalls are removable so that the truck may be used for other hauling. The ani- mals enter from the side, the side boards dropping MECHANICS eliminated, while it was also found to quiet the , patient before operation ' and to add to comfort Truck Containing Individual Stalls for Six Horses, the Sides Dropping Down to Make a Runway for the Animals down to make a runway. When the side- walls-are in place, sufficierit space is pro- vided at the top for the heads of the ani-; mals to protrude outside the Folding rug ; way doors. A cléated runway is provided | to be placed over the sidewall may | when itis dropped on. its hifiges. ANESTHETIC TAKES AWAY FEAR OF SURGEON’S KNIFE ,, Removing most of the apprehension which many patients suffer before an op- eration, an anesthetic has been developed which has fewer unpleasant aftereffects and involves less danger than many other preparations used for the same purpose. It goes under the impressive name of “iso- amylethyl barbituric acid” and was found during experiments to offset bad effects of some local anesthetics, including poi- soning, convulsions, nausea and vomiting. The anesthetic has been used experimen- tally and for the benefit of patients more than 1,000: times and, in no case, has there been poisoning or convulsions, and nau- sea has been greatly lessened or entirely afterward by producing a semiconscious state last- ing for several hours. . More work must be done, however, before the anesthetic is brought into common use. LADDER IS KEPT FROM SLIPPING BY ADJUSTABLE RODS Dangerous slipping of ladders is pre- vented by2a German invention consisting of sliding rods mounted at the bottom of eee the ladder in eyes that form an inte- gral part of a plate attached to the sidepieces. The rods are drawn downward in op- erating position by a lever and link pivoted to the mounting, and locked in. the de- sired position by The safety equipment adds but the lever. little to the ladder’s weight. @The antelope is the swiftest! of North American mammals.

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By DON GLASSMAN “Q'TAND by!” sings out the radio man; “We are about to broadcast the cor- rect time. When the gong strikes, it will be one minute and forty-five seconds after nine o’clock, eastern standard time.” People were never more punctual and precise. In this.age of swift tempo, we have gone beyond splitting mere minutes. Machines grind, trains roar, airplanes fly and ships sail on schedules having a start- ling approximation to the. astronomical events. Seconds are split! The Pacific fleet, steaming over the Arafura sea; the Atlantic fleet, bucking the Gulf Stream swell; a tramp freighter rounding the Horn; a whaler docked at Reykjavik, and the Byrd antarctic expe- dition—all have their routine attuned to the stars. If the world were out of. step 946 by only thirty seconds, many people and governments would suffer losses and disappoint- ments. Radio messages: would become garbled, astronomical predictions would mislead nav- igators, and nations would be cheated of land. The pineapple planter and antarctic explorer. each go to lunch at the exact stroke _ of twelve. Chronométer manufac- turefs are -slowing down. pro- duction because skippers depend less and less on cabin tinie- pieces. But the radio announcer, ‘ i ) Observing “Clock” Stars through Transit Instrument, and, Below, Master Clock That Keeps Time for the United States Quer \ skipy perts whet by st the | State TI of b star: such thei is a ness peat like only and tion aro’ mot con The The bat ton Six: sec

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skipper and pineapple planter are not ex- perts in astronomy. How do they know when the clock strikes twelve? Merely by setting their watches to the rhythm of the universe as broadcast by the United States naval observatory. The greatest clock face has a diameter of billions of miles. It is the sky. “Clock” stars move across the heavenly vault with such precision that it is possible to chart their movements years in advance. That is a vital part of the observatory’s busi- ness. As our earth rotates, the stars ap- pear to rise in the east and set in the west like the sun. The positions of stars are only slightly affected by the revolution and rotation of the earth. On a propor- tionate scale, the globe is merely racing around a tiny back-yard track, and all its motions are hardly perceptible when one considers the dimensions of the heavens. The stars swing overhead in a great arc. They march in solid phalanx—regiments battalions and companies. In Washing- ton, the observatory has erected a fixed six-inch telescope whose eyepiece is bi- sected by a hair line. An astronomer con- Queer Observatory in India; the Units Represent the Signs of the Zodiac, the Courses of the Planets and Various Other Phenomena; Calculations Are Computed According to Shadows Cast by the Luminaries sults a printed table and notes that a cer- tain star is scheduled to cross the observ- atory’s meridian or “finish” line in five minutes. The star looms suddenly. It seems to move, but really it is the earth’s rotation that brings the star across the hair line. The observer operates an apparatus which causes interruptions in an electric circuit. The interruptions are recorded on a sheet of paper fixed round a cylin- der, the chronograph or “time writer.” The same sheet records the ticks of a standard clock. Comparing the two graphs, it is simple to determine the dif- ference of clock time from astronomical time. Then the standard timepiece, made of gears and springs, is adjusted to the rhythm of celestial mechan:cs. The stars are relied upon to settle all arguments. For ascertaining daily time, observations are made on eight or ten clock stars. The average of these determinations is broad- cast to the world. Determinations of correct time by two expert observers usually agree within .002 of a second. A layman can hardly imagine 947

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948 POPULAR MECHANICS business. School gongs ring at nine-o’¢lock and factory whistles blew at five. Fair or stormy, time is inexorable in its flight. When skies are clouded, the world must rely on mechanical inventions for the correct time. Three standard clocks at the observatory are hidden in a .basement vault, under uniform temperature and air pressure, These clocks keep sidereal, or star, time. They are never what lofty mathematics enter into such a calcula- tion. Weird symbols and signs invented by the an- cients and inherited by Einstein play roles in this performance. These hieroglyphics do. not in- terest people who think in simple digits. What the nation at large cares about is how accurately the observatory delivers daily time. Consulting the latest data, I find that the average error is .031 second. The ob- servers admit that on two occasions in the past year their errors crept up to .44 and .62 second. They offer apologies and ask you to remember that normally their maximum error is .19 second. Every clear night, a naval observatory astronomer lies on a couch and consults the charted heavens. If the sky is over- cast, he cannot observe. Consequently, millions of clocks ‘march out of step, and there can be no adjustment until the yapory curtain melts. While astronomers wait on weather, the world goes about its Clock and Switchboard That Control Time-Sénding Wire Circuits, and the “Three Sisters of Arlington” Where Time Signals Are Sent touched, by hands, save for necessary _re- pairs. They have pendulum rods that do not change with temperature variations. These timepieces have a tendency to run fast. During the first year after cleaning, their daily rates are likely to increase one- hundredth of a second per month. But the actual increase is not so important, so long as it is regular. At present, the rate is about .01 second per day. gra mit cide pie and sen ma anc onc the ute the ing the Th fift fift ter wil the en tw ple

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Oo f- — & oO n POPULAR MECHANICS Aerial View of the United States Naval Observatory Grounds, Where the “Rhythm of the Universe” Is Interpreted in Correct Time and Broadcast to Widely Scattered Points throughout the World The standard clocks are linked by a tele- graph circuit to what is called the trans- mitting room. A transmitting clock coin- cides at all times with the standard time- pieces. Thrice daily, at noon, 3:00 a.m. and 10:00 p.m., the transmitting room sends telegraphic time signals. The hu- man voice takes no part in this perform- ance. Telegraphic wires sound the sec- onds as sharp clicks, and the radio sounds them as buzzes. Signals begin five min- utes before the exact hour and end on the last second of the sixtieth minute. An ingenious way has been devised to denote the end of each minute and half minute. The ticker is silent for the fifty-fifth, fifty-sixth, fifty-seventh, fifty-eighth and fifty-ninth seconds. After this pause, lis- teners-in know that the very first click will mark the birth of a new minute and the death of an old one. To denote the end of a half minute, the tickers omit the twenty-ninth second. After these delicate operations are com- pleted, the observatory’s responsibility ceases. The telegraphic pulse beats are picked up by six wires leading from the transmitting room. Via telegraph and wireless, the navy broadcasts correct time all over the earth. The air hums with electrical waves that streak around the globe seven times in one second. Battle- ships, merchantmen, islanders, explorers, even aviators may tune in on correct time. Impulses speed to Annapolis over leased wires. Signals from NSS, the navy wireless, are very powerful and may be picked up in most parts of the world. The telegraph companies rent thousands of clocks that are geared to master hands at the observatory. They, too, have standard clocks for use in case telegraphic communication should suffer interfer- ence. Ordinary broadcasting stations ob- tain correct time from rented clocks. A century ago, people were content with the time calculations of sundials. Radio and telegraph were unborn. Early in the forties, the observatory began to

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950 POPULAR MECHANICS and added to this is the cost of distribution to each individual consumer after the pawer has been transported in bulk. Trans- portation of electric power from producer to consumer is unique in that the product cannot be made in advance except to a very limited extent, and cannot be stored.up in slack seasons for the busy periods. PARACHUTE AND SEAT COMBINED FOR AIR SAFETY Greater safety in the air for passengers is afforded by a com- bination seat and parachute which allows the pilot, in case of dan- ger, to discharge his’ passengers Part of the Heavens’ Great Clock Face, the Most Accurate Time- piece Known and the One That Keeps the World in Step drop a time balk from the -building’s roof. If a citizen happened to. pass, he .amight adjust his watch. During Lincoln’s “ad- ministration, the observatory began sup- plying Washington fire stations with sig- nals over wires ordinarily used to ring alarms. Then a telegraph operator thought it would be novel to tell his colleague in Baltimore when to cease work. And the key man in Baltimore relayed the signal down the line. Norfolk and Annapolis told Charleston. Charleston told Sayan- nah. Savannah told Key West. Before long, telegraph operators from Portland, Ore., to Portland, Maine, were enjoying the convenience of correct time., At length the citizenry learned of this inno- vation, and the age of rented clocks was the upshot. COST OF MAKING ELECTRICITY Generation today constitutes only a $mall part of the cost of electric service. Except in special instances, it varies from a little less than one-half cent to a little more than one cent a kilowatt-hour, de- pending on conditions. Carrying the power to the consumer, including the ex- pense of poles, towers, wires and the land these occupy, and the loss in transporta- tion, constitute the bulk of the expense, through the floor-of the-plane, the parachute opening. automatically to bring tlie passenger to earth in the seat. he 6ceupied in the plarie: In an emergency, thé pilot throws-a lever which Simultanéousl? ‘releases _ the atpholstery from all seats, springs raising. upholstery and harness up and forward over the shoulders of the passengers to afford pro- tection. Passengers insert their arms through large holes in the harness of the parachute and fasten two -snaps, the op- eration requiring less than two seconds. The control wheel then drops one_ pas- senger each eighth of a turn, one normal turn réleasing eight passengers. A _ pull ring to open the parachute is carried in a pocket on the left side of the upholstery within easy reach of the passenger as the fall starts. Combination Airplane Seat and Parachute, Used to Land Passengers in Case of Danger LA sel ple op me ae op mi jo ar he or mi to th Sp cc

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yt il 1S _- cea‘t @@ POPULAR MECHANICS 951 LARGER AIRPLANES PROMISE LOWER FLYING FARES Tandem Motors of the Thirty-Two-Passenger Fokker Monoplane Built for the Universal Air Lines; Note the Two-Bladed Metal Propeller in Front and the Three-Bladed Adjustable Propeller in the Rear Reductions in passenger rates on air lines are seen as a result of planes with larger capacity and consequent greater earning power, such as the thirty-two-pas- senger Fokker monoplane recently com- pleted for the Universal Air Lines. In the opinion of William P. MacCracken, for- mer assistant secretary of commerce for aeronautics, such planes probably can be operated at a lower expense per passenger- mile. Anthony H. G. Fokker, designer and builder of the big plane, which is equipped with berths so that sixteen pas- sengers can be accommodated on night journeys, also believes that lower rates are assured in the near future. The latest Fokker plane has tandem motors of 525 horsepower each. There are two engines on each side. The front propellers are of metal, are adjustable and have two blades, while those in the rear have three blades to afford a better “bite” in the blast from the front “props.” The ship has a wing span of ninety-nine feet, carries a crew consisting of two pilots, radio operator and steward. On a test flight, it made 157 miles an hour air speed. Assuming such large planes can be operated at $1.50 per mile, which Mr. MacCracken regarded as not improbable, and that the average num- ber of passengers carried is twenty-five, the cost per mile would be six cents. Could the operators of thirty-two-passenger planes procure full loads, the operating cost on this basis would be less than five cents per passenger-mile, he stated. In- deed, with planes of larger than thirty- two-passenger capacity, rates as low as those on trains are not impossible, espe- cially if cost of Pullman accommodations is added, he asserted. WHITE FINISH FOR ALUMINUM Aluminum, naturally a dull gray, may be given a dead-white finish by a simple and inexpensive process reported to the American Electrochemical society. The metal is boiled in milk of lime to which a little calcium sulphate has been added. This coating is being tested as a base on which to apply paints and enamels.

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952 POPULAR MECHANICS HUGE DREDGE TURNS WATER OF LAKE INTO LAND 7 LoTR The “New Jersey” Filling in a Section of Chicago’s Lake Shore for Frontage Im- provements; Water and Sand Are Pouring from the Big Outlet Pipe, Forced from the Dredge in the Distance Closer View, Showing the “Spuds” or Feet by Which the Dredge Is Anchored and Moved Forward; at Left, the Revolving Cutter of Special Steel; It Loosens the Material for Passage through the Outlet Pipe; the Dredge Required the Construction of a Special Tug for Towing It

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POPULAR MECHANICS 953 PALATIAL DREDGE “WALKS” ON EIGHTY-TON FEET The dredge “New Jersey,” recently constructed for use along the great lakes, at a cost, with its equipment, of approxi- mately $2,000,000, has luxuries usually found only on passenger vessels. It has been described as the “largest and most expensive contractors’ tool ever built.” It is of the cutter type, that is, it has a huge revolving blade of vanadium-steel alloy to loosen the material under the wa-- ter so that it can be discharged in semi- liquid form to the point desired through big pipe lines. The intake, thirty-four inches in diameter, is in the center of the cutter. As the big blade, driven by a 600- horsepower motor, whirls, sand, clay and small gravel are sucked up by a 3,000- horsepower pump and sent through the pipes. A thirty-inch stream can be forced a distance of 10,000 feet. The “New Jer- sey” has two spuds, weighing eighty tons each, as feet on which it “walks” forward as the work proceeds. One spud is low- ered at a time to form a pivot on which the dredge turns. When it is necessary to move, this spud is hoisted and the op- posite one lowered. Electric current for operating the machinery generated through four Diesel engines of 5,000 com- bined horsepower. .If used for. lighting alone, the plant would furnish electricity sufficient to illuminate a city the size of Albany, N. Y. There are fifty-seven mo- tors in all. A crew of from forty to fifty- two men, worked in three shifts when con- ditions demand, are housed in comfortable quarters, attractively finished in plywood and fitted with electric fans, shower and bathrooms, a social room, large dining hall, a laundry and modern kitchen with an oil-burning range. The dredge has its own telephone system for communication throughout the craft and to the end of the pipe line, which may be more than a mile away and therefore obscured by fogs. The “brains” of the dredge are in the for- Sketching from the Jointed Wooden Model of Human Form Adaptable to Many Different Poses JOINTED MODEL FOR ARTISTS TAKES MANY POSES As a substitute for a live model, a jointed wooden figure, with arms, legs and torso that may be arranged in many poses has been introduced for artists. It is ac- curately shaped as to scale and propor- tions, easily manipulated and, when nof in use, may be taken apart and stored in small space. is BOTTLE OPENER ON PENCIL TIP FITS IN VEST POCKET Pencil and bottle opener are combined into one handy instrument that is now on the market. The opener fits over the end of the pencil so that both may be carried in the vest pocket, the two occupying no more space than the ordinary lead pencil. ward control room, overlooking the cutter and the gauge that shows the depth of the excavation being made. Here, the opera- tor manipulates the controllers that gov- ern the speed of the cutter and the pump and watches the instruments that show how the machinery is functioning. @As high as the tallest modern automobile, and with a “wheelbase” of about 140 inches, the skeleton of a prehistoric hog has been mounted at the University of Nebraska.

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Headlamps Are among the Automobile Accessories to Receive Thorough Tests; Here Are Shown Some of the Lights Being Tested to Determine Their Point of Highest Efficiency By C. F. KETTERING Inventor of the Automobile Self-Starter and Head of the General Motors Research Laboratories to WORLD is eager for new ideas. The field of invention has no bounda- ries. Everyone is curious about some- thing new and will buy it if he can. And the better it is, the longer he will keep buying it. Industry awaits each new de- vice that is technically sound, can be pro- duced economically and sold. During the past three years, over 35,000 inventions have been brought to the atten- tion of one group of business men. Only a small number survived. Only these few fulfilled the threefold conditions—techni- cal, production and sales. Therefore, something is wrong somewhere with the way people invent. It is not only a matter of disappoint- ment and punctured ambitions; it is an unjustifiable economic waste of money and labor, particularly the latter. And the waste does not make half so much difference to anyone as to the inventor himself. Admittedly these statements are harsh. They immediately put many persons on 954 the defensive who will argue that what was true of 35,000 inventions does not hold for all inventions, or in all arts and industries, and that the particular group of business men does not represent in- dustry as a whole. People will resent the implication that the inventor is at fault. These arguments and others would de- serve careful consideration if it were the purpose at present to defend inventors. But success takes care of itself. Faults in inventing are the things to look for. Trouble, honestly faced, is the beginning of progress; and the rejection of thirty- odd thousand devices is trouble enough to start with. Instead of trying to deter- mine whether the business men were right in rejecting the devices, why not find out exactly what the attitude of business really is with regard to inventions? Why not find out some of the things that the in- ventor must do if he is to be successful in the business of inventing? Frankly, business is always on the look- out for good new devices. The manufac-

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liyetators © turer wants them as sources of profit. He recognizes that everyone is becoming more and more mechanically minded., Washing machines and ironers, vacuum cleaners, automatic refrigerators, sewing machines, with all their latest improve- ments, are making the wives engineers as well as housewives. Radios, automobiles, talking machines, talking movies and a numberless list of everyday utilities are all business enterprises. All depended in the beginning on new ideas and devices. But there are no park benches in pro- gressive business. No industry can re- main permanently successful by sitting complacently on any invention, however good. While a fortunate ‘invention or discovery may have started a concern, only brains and dissatisfaction can keep it going. The men at the head of a con- cern must be eternally dissatisfied with their own products and must be eternally doing something about it—everlastingly on guard to find ways and means to im- prove and devélop. This healthful policy of being dissatisfied and doing something about it operates in nearly all induStries. It was behind the automobile in every stage of its advancement: self-starting, Above, Testing a Set of Brakes under the Same When They Are in Actual Use on a Car; Below, of Scientists and In- dual-beam headlights, time-payment financing, nitrocellulose lacquers, and so on. The very 13 same policy has trans- — - formed the wireless tele- —S graph into the very latest alternating-current radio set. And while bringing about these greater values and enjoyments to the people who buy, it has also produced profits to the manufacturers vith brains enough to be dissatisfied, and profits to those who helped the manufac- turers to progress. Some of those who help must search for new devices, methods and principles. Others must develop designs and duction methods. Still others have the field of distribution and merchandising. No one in an organization is responsible for progress to the exclusion of his col- leagues. Sometimes the engineer or in- ventor who holds the patent, claims the entire credit. Conditions as a Conference ventors pro- sut in ninety-nine cases out of a hundred, a device would be utterly useless were it not for the production man, the accountant, the financier and the salesman.

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956 POPULAR MECHANICS Of course, there is no question of the importance of the engineer. He-is the man who is hired to look for the troubles in a product and remedy them. He is a pro- fessional fault finder and fixer. His stock in trade are intelligent imagina- tion, clear thinking, accurate explana- tion, careful obser- vation and definite recording of facts. If, in addition to these, he has a fair share of business acu- men and a pretty big share of common sense, he ought to be a good engineer or almost anything else. Business men have come to appreciate the commercial value, in dollars of profit, accruing from men with these characteristics. They are be- ing put more and more on the company payroll as consulting engineers, research engineers, metallurgists, chemists, physi- cists, and what not. They are very sel- dom, if ever, called inventors. But, in a way, they must be, for it is their job to find remedies in concrete designs and ma- terials. For example, engineers invented the harmonic balancer, orthophonic vic- trolas and the bimetallic disk for electric irons. When engineers are on the-com- pany payroll, they are expected to apply their talents to the solution of a definite problem which has, or is thought to. have, a definite relation to the company’s profits. This connection may be obvious, as in tracing down the cause of breakage in a spring leaf, or it may be obscure, as in measuring the surges in a condenser. Then, too, the engineer must be orderly and make constructive progress in his work. He is spending the company’s money, not his own; and normally a com- pany is not in business to make experi- ments but to make money. No engineer on the payroll can invent in red ink. En- gineering is a combination of brains and material. The greater the brains, the less the material and the less the cost. This does not mean that inventors out- side of an industry cannot have a defi- nite purpose in their work, cannot have a commercial point of view and cannot appreciate economy; quite the contrary, many in- ventors are just as orderly and just as businessliké as any engineer. Con- Top, Sound Tests to Eliminate Car Noises; Center, Magnet to Test Defective Steel; Bottom, Studying Knock in a One-Lunger th tu be 7S -

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POPULAR MECHANICS 957 Detecting Impurities in Metals with the Spectroscope, Which Separates Light from Hot Metallic Vapors into Component Colors Just as the Raindrops Separate Colors to Form the Rainbow versely, many company engineers are But this much is true: Definite; ness of purpose and an appreciation of the commercial situation involved consti- tute the most rigid base of understanding between the men on a-company payrgll and those on the outside.-° This is: par- neither ticularly true if the lattér fi: aysaprrething. to sell. ‘ However many engineers,-or- inventors a company has on its payroll; however much in equipment and-Jaboratories, «it can never hope to. think-of all the im- provements for its.own products....Good ideasy and devices are bound to,eriginate on the outside. The race of good inven- is open for all. But it is a huréle race...Attempts to run argupd, or ign two. or.three hurdles accogint,for neds all t failugres in inyenting. So advice fo. in- ventagge can be reduced to Jim, this :, Do not rug around these hur dlésagjump ONRT if you an. Be aware, Athat@in ananyy fines of endeavor invention has largely ‘pakked away Arom the’single inventor workip®: by himselg wndis.now to be expected from,a groug pk individuals working closely to- gether. Jn General Motors research labo- ratories, for instance, much invegtive en- gineering. is being applied to. the. power tions plant of automobiles. No one is trying to do the thing by himself. One is _in- vestigating valves and camshafts, another pistons; another combustion chambers; another carburetors and manifolds; an- other the atomic structure of fuel, and another is inventing instruments which will.reveal the pressure changes that take place in a combustion chamber. But the Significant fact is that each recognizes his dependence on the others for the com- plete success of his own work. The en- gineer will not be successful in a combus- tion-ehamber study unless he takes full advantage of all that the fuel-research engineer has to give him, and vice versa. The inventions and discoveries of the in- dividual are largely due to co-operation. Of course, it is not always possible to work with others in the growth of one’s own ideas. Nevertheless, co-operation re- mains as an ideal limit. Wise inventors are taking every advantage of what others have to contribute to their own ideas. Familiarize yourself with the commercial development in the art. As pointed out above, business is aggressive in finding and trying new ideas. It has tried thou- sands of things that would be beneficial if they would work, but, as a matter of fact, do not work or cannot be produced economically or sold. So it seems useless for an inventor to go ahead with these same old ideas without finding out, first, why business rejected the ideas; second, if the causes of the previous rejection still

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958 POPULAR MECHANICS operate. The chances are that many in- ventors never even take the trouble to find out. if their idea has been tried. They too often spend their own time and money first only to meet disappointment later. Familiarize yourself with previous work in the art. Mighty few startle the world with a completely new mechanism. Most inventions are only the development of some device or process already well- known. Nearly every development has a long history to which each inventor con- tributes a little. It will save the inventor a great deal if he first investigates this history. Possibly the very same ideas he has in mind have already been thought of, adopted and then discarded for a better plan. This may be disheartening, but in- venting is serious business and must rely on facts, not fancies. If an inventor has determined exactly the previous commercial and technical history of his device, made up his mind to use the experience of others as a working tool and then feels that his device is still worth something, he has jumped the high- est hurdles. A few low ones remain. Keep detailed notes of your daily ef- forts. It would be unwise to make any general statement here on legal matters ‘but at General Motors, from the legal point of view alone, every research engi- neer is required to keep daily memoranda of his ideas, conversations, plans, tests and efforts relating to his work. These notes are signed and dated every day. They are witnessed and filed away in the vault as an undeniable evidence of diligent and con- sistent work. They are a record of what the engineer set out to do, how he pro- ceeded, what his difficulties were and his plans to overcome them. With these things in mind, he is in a position to carry out orderly, purposeful and successful re- search and inventive thinking. Be on guard to simplify your device. Generally speaking, simplicity means re- duced costs, ease in manufacturing, quick understanding on the part of customers and greater satisfaction in their service. To a large extent, successful invention re- duces the complexity of a mechanism or decreases the mental anxiety of the op- erator. Since these things determine the life or death of a device, an inventor will do well to simplify his device. If it weighs ten pounds, try to make it equally strong at six. If it has forty parts, try to make it operate better with only twenty-three. Look at your device as a problem of science. Pretty much without exception, devices are all problems in physics and chemistry. The chemical formulas are the language of the inventor who looks at his device in fundamentals. The concepts of the science may appear technical, but in- venting is technical business. The greater danger is that the laws of science are con- sidered too superficially simple, whereas they demand precise and clear thinking. For example, take the case of the inventor of a battery that apparently produces more electrical energy than does an ordi- nary battery. Very frequently the output of such a battery is remarkable for a few hours and then the battery fails. The trouble very likely is that the inventor did not look at his battery as a problem in chemistry. He knew that if he put in two metals with an electrolyte between, he could get an electric current. He did so and took the first step in making a re- markable battery. But he did not go far enough. He failed to see the chemistry in the reaction of metals with acids. That is why his battery failed: The electrolyte corroded the plates. Subject your device to tests and obtain quantitative measurements of its perform- ance. Even if this battery inventor had been no chemist, still, with an open mind, he should have discovered that something was wrong with his battery. If he had put it to honest test, time would have shown him. The test is the thing. It is the easiest thing in the world to conduct a test to prove anything you want, if at the outset you are convinced that your device is all right. But it is unques- tionably better to find the facts regardless of their consequences. This may require a great deal of careful study, for often the test is more than half the problem of in- venting something. But test or no test on the part of the inventor, the test is coming just as sure as taxes, as the manu- facturer undoubtedly will test the device before he agrees to buy it. When the public buys it, they will test it. They will use it under all sorts of con- ditions. If it doesn’t stand up, they will not continue to buy. The chief trouble with letti testi pub on | port is p thin It for his the nee stat eve sho dev I yo Im pos me at Sav Th bu wc ing kin na wi pr TI th

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POPULAR MECHANICS 959 letting the public do the testing is this: When the public makes its réport on the device, if the re- port is bad, the inventor is powerless to do any- thing about it. It is a great deal better for the inventor to do his own testing. About the only equipment he needs to start with is a state of mind that is for- ever open. And the test should disclose how the device performs. 3e rather pessimistic of your achievements. Imagination is what sees possibilities for improve- ment. Watt’s imagination at his mother’s teakettle saw the steam engine. Then he went ahead and built an engine which worked. His was a work- own ing imagination; another kind is a wishbone imagi- nation. Inventors with a wishbone imagination see a valuable im- provement and wish it were accomplished. They wish so hard, they finally imagine they have brought it about. Years and years ago people invented flying machines by the wishbone method. The Wright Brothers used the working method. Possibly a little hard pessimism about your own ideas and achievements will be fairly sure to make your imagina- tion work to some useful end. If not, it will at least save much embarrassment. Realize that a device must be adaptable for production if intended for general use. This hurdle is just common sense. Any inventor who honestly tests his invention and is somewhat pessimistic will jump this hurdle naturally. After all, inventing is just one phase of industry, and inventors must have as much commercial sense as inventive genius. Focus your effort on the problem and not entirely on your device which you think solves the problem. This is just common sense also. Unfortunately a great many inventors are heart and soul in their device and never find out that the Determining Exact Carburetor Performance by Placing It in a Mercury- Sealed Box and Observing Data from Instruments device does not come within a gun shot of helping the situation. But these are not the wise inventors. Select a reliable patent attorney. When the manufacturer is interested and the public wants the device, the only equity the inventor has is patent claims. The lawyer is probably the only man who can write patent claims. So the only thing the inventor can do is to be mighty sure that the lawyer is worthy of this great re- sponsibility and trust. It is difficult to sell an undeveloped idea. Edison could not sell the idea of electric lights but he could and did sell the lights. An inventor can sell his services or he can manufacture and sell a product or patents or rights under patents. But he can rarely sell an idea. Inventors often approach business with “a big idea” and ask for a large sum of money. It would be more to their interest and better business prac- tice to offer a drawing or sketch or de- scription duly protected. These are some of the hurdles. may be others. If you find jump over them. There any more,

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960 POPULAR MECHANICS Chair Fitted to an Airplane for the Convenience of Parachute Jumper or Stunt Performer CHAIR ON TOP OF PLANE WING FOR JUMPER OR STUNTER For the convenience of the person en- gaged in parachute jumping or perform- _ing stunts from an airplane, a French in- ventor has devised a special chair. It is of metal and-securely braced to the top of the wing of a biplane, just above the pilot’s seat. This gives the jumper immediate and easy access to either wings or fuselage. CROOKED HOOK HELPS LAND FIGHTING FISH Combining lever and corkscrew action when a pull is exerted, a fish hook with a crooked shaft has been made, to enable the easier landing of game fish.. The hook also allows the bait to revolve-in the water, simu- lating life. The shaft .is ‘bent al- most at right‘ an- gles about an inch bélow the eye, and the hook likewise is curved outward from the shaft much more sharply than the ordinary hook. A pull exerted at the eye causes the hook to turn much like a cork- screw in reverse action, and at the same time gives leverage. It may be used with or without a barb and is easily removed when the catch is landed. LUMINOUS FLY PAPER CATCHES INSECTS AT NIGHT Luminous fly paper that lures light-lov- ing insects to a sticky doom, at night as well as in the daytime, has been produced by combining phosphorescent pigments with the coating which shines when the paper is in the dark. Phosphorescent ma- terials also are being used for signboards, house numbers and on life buoys to make them visible in the dark. TINY ELECTRIC WATER HEATER CARRIED IN POCKET Heating water where the usual facilities are unavailable is ‘simplified with’a small electric outfit which is so compact that it may be carried easily in a pocket or traveling bag. The heater oper- ates quickly, as it is placed directly into the water. It is constructed of aluminum, and the manufacturers claim there are no parts to get out of order. SHAVE ' CATHEDRAL WINDOWS Safety-razor blades have been used to save the priceless fourteenth-century stained-glass windows of Somerset cathe- dral in England from what seemed irre- trievable ruin. After exhaustive chemical and microscopic examinations, experts de- cided that the windows, as befitted their age, were growing chemical whiskers, and they were saved by being literally shaved with .ordinary safety razors. Sulphuric acid fumes from gas lamps combined with dust from the stone with which the cathe- dral is paved caused the incrustation on the stained glass. M to beer supe naut depz The mar state acte feet or The rout Ur; atic viev stan one lanc The fro1 ters MC C and San strt tob Sar vid ab] be;

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POPULAR MECHANICS 961 HIGHWAY SIGNS GUIDE PILOTS Marking of highways to guide airplanes has been undertaken under supervision of the aero- nautics division of the department of commerce. The plan provides for marking all federal and state highways in char- acters of ten to thirty feet in height in yellow or white traffic paint. The markers show the route number and the “U. S.” or state abbrevi- ation. A highway, viewed from the air, ©F *4 stands out clearly and is one of the pilot’s best landmarks if he knows what road it is. The markers would appear at intervals of from ten to twenty miles and at road in- tersections. MOTORCYCLE RUNS CANDY CART AT SMALL EXPENSE Combining a secondhand motorcycle and an old pair of automobile wheels, a Santa Monica, Calif., cripple has con- structed a motorized candy cart to supply tobacco and sweets to anglers on the Santa Monica pier. The motorcycle pro- A Motorcycle Furnishes Motive Power for This Candy Cart, Mounted on Old Auto Wheels vides sufficient power to move the port- able store from place to place along the beach and cost less than $300. One of the Classroom Coaches of a German School Train Where Road Em- ployes Learn the Theory and Practice of Railroading SCHOOLS ON WHEELS TO HELP TRAIN RAIL WORKERS Traveling “school trains” have been or- ganized. by the German government, which operates the railroad, to teach em- ployes the theory and practice of the busi- ness. The road has equipped a number of passenger coaches as classrooms, each in charge of an instructor. These cars move from place to place, classes being held at each stop, where employes, with- out loss of much time, are given instruc- tion in the operation of trains. The cars have all necessary demonstration equip- ment. HEALTH JUDGED BY EYELASHES Long eyelashes, generally considered a mark of beauty, have been found by a Japanese physician to be a sign of ill health in many cases. After a two-year study, the doctor came to the conclusion that most children in poor health have long eyelashes. He found the lashes of consumptive children grow twice as long as those of children that are in good health. The lashes of the latter grow about an eighth of an inch the first year of life, while those of scrofula sufferers grow twice as long. No explanation of the con- dition has been offered, nor has it been ac- cepted as a definite criterion of the state of a child’s health.

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Transportation Has Al- ways Been a Problem to Man, and Here Are Three of the Latest Modes of Travel for the Youngsters

By ALFRED ALBELLI ERY often the careers of great men in various scientific fields have found their first inspiration, according to Ferdinand Strauss, head of a large toy factory, in the playthings which amused and fasci- nated them in childhood. He goes so far as to assert that there is no inventor who cannot recall the in- fluence, slight and subtle as it might have been, which tinkering with toys has had on his bent to inquire into what composes their mechanical elements, and in eventu- ally shaping his life’s course. “Many a youngster,” said Mr. Strauss, “is started early on a career through the en- couragement he receives as he takes his first toy apart to see howit works, and then tries to put it together again. “The desire to know what a toy is made of and why, what it is supposed to do and how it does it, teaches the child many things. History is full of examples of 962 men who received the incentive for their future life work from their playthings. “Everyone knows that Thomas A. Edi- son spent all of his playing time with tools. Neither did the Wright brothers invent the airplane by accident. During their childhood days they continuously played with balloons. They would inflate differ- ent-sized balloons and float them at va- rious heights to observe how the wind blew them and see which floated highest. “Carl F, Akeley, the inventor and big- game hunter, also spent his play hours as a boy with various types of small imple- ments. The gift of a folding pocket foot- rule, he has told me, gave him a big thrill, and with his tools he made toys and use- ful articles for the house. In later years, during his famous exploits in the jungle, hundreds of miles from any source of su»- plies, this ability of construction stood him in good stead. His fun with a tool chest

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Make thea as a boy now turned to great practical Y worth in facing the crises of travel and — x shelter. ’ “Another great man in whom the influ- ence of toys is traceable is Dr. George Ellery Hale, of the Mount Wilson obser- vatory. He is one of the world’s foremost astronomers. Among his favorite toys were engines, yachts, and other machines that afforded opportunity for mechanical construction. - » ~« = la \ ‘ My The Advance in Aeronautics within the Last Few Years Has Made Its Effect Felt in Toyland, and the Ingen- ious Models and Toy Airplanes Have Proved a Source of Almost as Much Amusement to Grown-Ups as to Children; at the Right, an Airplane Model That Appears to Have Caught the Fancy of Someone Long Since Removed from Childhood; Below, a Little Girl and Her Family of Forty Dolls, Including Almost Every Kind, from the Sawdust-Filled Rag One to the Dainty China Dolls That Talk and Cry and Walk 963

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POPULAR MECHANICS 2% ii > » &@, “i e, sevveecerere + @& = == @@@ee@e . <P ge "4 2 ¢ “43 % - sd ‘ & o Above, the Manufacture of Dolls in a Toy Factory, and, Below, Inmate of an Old Men’s Home at Work on Christmas Toys m- “When he was ten years old, his father gave him a tool chest, and this became the nucleus of a small workshop that he built eight years later. He had a lathe, a scroll- saw, a microscope, a camera, a telescope and other apparatus with which he equipped a small laboratory. There he began to design sim- ple physical and astro- nomical instruments. Doctor Hale still uses some of the ‘toys’ of his boyhood. “And there is Rear Ad- miral Wm. A. Moffett, the chief of the bureau of aeronautics, U.S. N., who has told me that, as a boy, he was most inter- ested in flying kites. I would go so far as to wager that if Lindenthal and Modjeski, the great

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POPULAR MECHANICS bridge builders, were to tell you of their childhood, you would learn that as boys they spent a great deal of their time mak- ing toy bridges. “Toy making has its own peculiar psy- chology. Toys should be a diminutive du- plication of the instruments of man. For instance, a child hears of the Zeppelin. There is a link between his imagination and reality which I try to transplant in the miniature toy Zeppelin which I invent for his pleasure. I try to incorporate into the toy the principles by which the genu- ine article operates. Then the toy not only amuses the child, but also teaches the fundamentals involved. “Another thing—the toys must have durability. They must be able to stand the use and abuse that children necessarily give them. A doll should not lose its stuf- fing when ‘it falls to the floor, nor should a mechanical toy cease and desist, as we say, after the fifth winding. If the child is disappointed in the toy, he will not think much of the article it imitates. “For many years, mechanical toys have been the favorite playthings, and in a com- paratively short span of time they have shifted from foreign factories to America, where they are the foundation of an es- tablished industry. About eighty per cent of the mechanical toys sold in America are These go into hun- of American make. 965 dreds of thousands of homes, and the vol- ume of business runs well into millions of dollars. “All through my toy-business career I have tried to impress my workmen-and my customers that toys are not only bought for emotional reasons, as when little Mary’s birthday rolls around, or because Johnny is a good boy. “T have tried arduously to show that the appeal of toys was more profound than is readily thought; that the, child has a vivid imagination, that he is in the formative stage and that impressions he gets from playing and experimenting with his playthings will do much to mold his future. Quite often it creates the spark of what later becomes mechanical or cre- ative genius. “Lastly, there is the commercial aspect, too, which is very vital. Most children have a superiority complex. Toys, like autos, trolley cars and derricks, which en- able them to operate these in a manner they believe similar to the manipulations of the real thing by their elders, create in them a feeling of superiority. Childrén also yearn to play with miniature repro- ductions of objects which score popularity with the general public.” Zeppelins with two propellers that: re- volve when the ship is pulled along the floor, are among the “newest” toys this “Dismal Desmond” Is the Latest Addition to the Soft Toy-Dog Family, and Here Is a Little Devotee of the Desmond Family with Quite an Assortment of the Sober Puppies

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966 POPULAR MECHANICS

Above, Santa Claus’ Automobile Fleet for Good Little Boys; Left, “Pyramids,” One of the Games of Skill are scarcely any absolutely ‘new’ toys. Possibly some inventors are overlooking a profitable field in this direction, but, as in other forms of mechanics, a wholly new idea is difficult to originate. How-

season, R. C. Gibson of Marshall Field and company, pointed out, declaring that since the child’s world is a “minature edition” of that of the adult in many respects, it is only natural to have the youngsters in- tensely interested in what conterns their parents, especially when that interest is represented in an effective way as in a toy. For the same reason, model airplanes and other toy aircraft of a wide variety are sweeping the stores just as aviation is claiming the nation’s interest. “Mechanical toys that simply run have comparatively little appeal these days,” said Mr. Gibson, explaining the decreased interest in climbing monkeys and other things of that kind. “The toy that is ac- curately and realistically made and that functions as nearly as possible like the real article wins the child’s heart. There ever, there are constant improve- ments over existing ideas.” He demonstrated a mechanical tractor, another new article this year. It is a faithful replica of the endless-tread affair and climbs steep steps and mounts other obstructions with ease. The tread is a large corrugated rubber band, moved by a strong spring motor. Toy dogs are not new, but this year finds the well-stocked store with supplies of realistic models of different breeds of dogs. Children are no longer content with just a toy dog, they want a chow, an airedale or a terrier, and the manufacturers have answered the demand with a remarkable line of animals that have all the markings and colors of the live dogs. Three-compartment electric stoves with three switches and a thermometer just like the full-sized kitchen cookers, sets of

toy « tors tiny : eled mod little teres dem: sets dere the craft mec pres lar < are girls CO G twe are gan The and the In pell by the CA pu by avi wl

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POPULAR toy dishes with electric percola- tors that actually operate, and tiny sets of furniture closely mod- eled in style and color after the modern ideas are available for the little girls, and, although their in- terest in dolls has not waned, they demand better-dressed ones and sets of clothing that can be laun- dered. Toy merchants declare the model planes and other air- craft, as well as many forms of mechanical toys designed ex- pressly for boys, are just as popu- lar among the girls, but the boys are rarely willing to play with girls’ toys. COLOR-DOTTED GOLF BALL IS EASIER TO FIND MECHANICS 967 Projector in Operating Position on Cabinet; It Is Slipped into Golf balls on which are marked twelve brightly colored dots now are on the market, to help improve the game and reduce the cost of playing it. The dots make the lost ball easier to find, and the various combinations in which they are arranged simplify identification. In addition, it is claimed they make the pellet look larger and give a better target by providing a point on which to focus the shot. CATAPULT TO SHOOT LIFE LINE RESEMBLES CANNON Somewhat resembling a cannon, a cata- pult to launch a life line has been invented by Santos Dumont, European pioneer in aviation. The catapult, mounted on two wheels, is easily transported and designed This Apparatus, Which Looks like a Cannon, Is a Catapult That Launches a Life Line to shoot a line to persons in distress when it is impossible to launch boats to go to their aid. Rear Compartment When Not in Use; Note Film Racks at End HOME-MOVIE CABINET HOLDS PROJECTOR AND SCREEN For showing movies at home, an attrac- tive cabinet that holds the projector, splic- ing machine, camera and other units, be- sides a screen and space for storing forty- five 400-foot reels in humidor cans, has been placed on the market. When closed, it forms a convenient desk or stand. An upper hinged panel drops down to form a shelf and to expose the projector, which is easily removed from its compartment and adjusted for running. Plugs for at- taching to wall sockets are installed. The shelf provides a convenient base for the projector when pictures are shown and also serves as a working table for editing, splicing, rewinding and title making. At either end of the cabinet are racks for storing the film cans, and there are also compartments for the camera, tripod and title printer. The back of the cabinet is the screen. This is easily removed and mounted at any convenient place in the room. The outfit is adjustable to differ- ent heights, weighs but fourteen pounds, and the screen will not wrinkle or buckle, thereby insuring better displays. The en- tire cabinet rests on concealed casters. @Whenever you find that you wish to know more about any article in this maga- zine, write our Bureau of Information.

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A Portable Rowing Machine, So Compact When Folded That It Fits in a Suitcase ROWING MACHINE IN SUITCASE IS EASILY CARRIED So compact and light in weight that it may be carried easily in a suitcase, a port- able exercising machine, constructed en- tirely of aluminum, is on the market. It reproduces the exercise of rowing and has rubber-tired wheels and base, so that it may be used in hotels without disturbing other guests. Being adjustable for ten- sion,-it can be adapted to the use of weak or strong persons. HOUSE OF THE FUTURE IS SEEN IN GLASS BUILDING Constructed entirely of glass, a building at a recent exposition at Poznan, Poland, excited considerable in- terest, and possibly gave a hint as to the structural material of the future. The walls and even a tower were built of glass, and triangular effects in the walls gave the structure a futuristic appearance. ONE LANDING-WHEEL PLANE ACCEPTED BY ARMY A Loening amphibian with only one landing wheel, mounted in a well in the center of the boat hull’s keel, has been ac- cepted by the army after trials. The one- wheel landing gear was patented in 1924 by Grover Loening, and in 1926 the army equipped an old training plane with a sin- gle wheel, based on his patents, and made several successful Jandings, which showed the idea was fundamentally sound. Asa result of the tests the army placed an order for one of the planes. The single wheel draws up into the well, which is a water-tight compartment like the center- board well on a yacht. Mr. Loening also has equipped his Moth sport plane with the single wheel, and none of the three ships show any tendency to turn over on the ground. After the ship comes to rest, supports, ending in small rollers, are dropped from the wing tip floats to steady it. In flight, or when making a water landing, two hinged flaps close the well below the wheel. The ship built for the army also has the new Wright typhoon, inverted-V engine A Possible Hint of Structural Material of the Future Is Given in This Glass House of Modernistic Design Which Attracted Much Attention at a Recent Polish Exposition

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e ol” ClUM™ ceo T hh” POPULAR MECHANICS 969 SUBSTITUTES FOR COAL AND OIL TESTED French scientists, look- ing to the time when nat- ural supplies of coal and oil will be exhausted, are making experiments with five substitutes to furnish power for mankind. The researches include a plan to tap the thermal energy of the sea by utilizing the difference in temper- ature of a current such as the Gulf Stream and the surrounding sea; a de- vice, which already has proved its worth, for uti- lizing the energy of the tides; a method of using the wind; a plan to use the difference in temper- ature between tropical and arid regions by har- nessing the heat of the desert, and a plan to cre- ate an artificial fall of water between two neigh- boring bodies of water of different altitude, such as the Mediterranean and the Dead Sea, the volume entering the lower body equaling the amount of evaporation. Another idea, evolved by a German engineer, in- cludes damming the Mediterranean at the Dardanelles and at the Atlantic end and using the overflow to produce electrical energy and irrigate the Tunisian Sahara. One French scientist is engaged in laying a pipe, 5,000 feet long, into the sea to dem- onstrate that the thermal energy of the ocean can be made to work, while another experiment involves laying a tube along the incline of the Atlas mountains on the theory that heat rises in columns or cones of energy and that this energy can be canalized in the pipe and transformed into electrical power. One way to tap the en- ergy of the tides has been found by an inventor who has made a water wheel to enable ships to move against the current upon power derived from that current. Uniformity in Garden Design Is Attained with a. Planter Which Prepares the Holes, and a Paper Pattern of the Design GARDEN TOOL PREPARES HOLE FOR SETTING OUT PLANTS Setting out plants is simplified by a garden tool which prepares the hole to receive the plant while the operator re- mains in an upright position. The base of the planter is shaped like an inverted cone and is adjusted to a rod with an axle similar to a brace, which, when revolved in the dirt, makes the required opening. When used for field plants, the hole is made at an angle and may be closed by stepping on the ground. Use of this tool together with designs on paper of various- shaped beds enables uniform planting of flowers in any desired pattern. @ Fast-flying birds have stiff, trim feathers.

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t 4 j by MTN Gat 8 An Architect’s Conception of a Future Airport, Designed like a Railway Terminal, the Planes Being Towed by Electric Truck to a Field Outside after Loading or Unloading By HAMILTON M. WRIGHT wo forty million dollars having been spent on aviation development in the United States during 1929, and with the airplane leaping into popularity more swiftly than did the motor car in its early 970 days, it is obvious that every city and town in the United States that wishes to keep in step with modern progress is de- veloping its own airport, as the new gate- way to the city.

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Another Conception of a Future Air-Minded City with Streets Radiating from a Central Airport and Railroad Terminal, 7,500 Feet in Diameter, with Space for Hangars and Hotels The desirably situated airport is to be regarded as a paying investment not only in the increased prestige and advancement accruing to the community which pos- sesses.a modern air field, but in the return from the airport itself. Well located sub- urban property near a thriving center is almost always sure to grow in value. When the great railroads selected their rights of way, switching yards and termi- nal locations, the land was given as a bonus by the government or could be bought for a song. It has, since those early days—generally speaking from thirty to eighty years ago—appreciated in value by billions of dollars. Today, aviation, the latest medium of swift transportation, is confronted, similarly, with the necessity of locating its terminals, and while it can- not buy land at the low figures obtained by the railroads, it will save money by acting with vision to provide amply for its future growth. In importance and value, experts believe the larger airports of the future will rank with the great rail- way terminals of today. Near the smaller cities and towns, airports will be as neces- sary as the local railway depots. More- over, since the airport is the key of all commercial aviation, great air-transporta- tion companies in the process of expansion and of the absorption of smaller rivals. will undoubtedly des're to pre-empt and im- prove the best airport locations. The. head of one of the largest real- estate associations in the United States said recently: “Gfeat crowds of people even now visit our airports on Sundays and weekdays to watch flying activities. Since real-estate values follow the crowds, it is easy to see the influence of airports on adjacent land areas. “The modern airport is becoming a gate- way to the city or community it serves. It may be very directly compared to a railroad terminal in its functions, facili- ties and general character. The airport crowds are in holiday mood, demanding food, care and entertainment. The field personnel, including ground attendants, the administration officials and the pilots, must be housed and fed. All this activit-’ in connection with airports is creating new uses for real estate:” The more immediate sources of profit, however, arise from the airport itself. Like the gasoline filling station and ga- rage, it has definite services and supplies to offer. Among them are the retail sale of gasoline and oil. Rental of hangar space is another item. The average rental is about $40 per month, ranging from $15 971

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POPULAR MECHANICS 973 > — ee ' if. An Architect’s Idea of How a Landing Field Might Be Built on an Elevated Platform above the Pennsylvania Station in New York; Pneumatic Tubes Would Handle Air Mail from It to $30 for a small plane up to $60 to $75 for a large one. Repair service, conces- sions, such as hot-dog stands, restaurants, bowling alleys and rifle galleries, and the rental of parking space for automobiles near the airport are among other profit yielders. The average cost of looking over a plane is about $2 an hour. Then there are passenger hops above the surround- ing country, already an important Sunday and holiday pastime and source of rev- enue. The publicity manager of a south- ern resort city instituted bridge parties in the air and afternoon teas in airplanes starting from the municipal airport. As the number of airports throughout the country increases, cross-country taxi air service will come more and more into vogue as a future source of income: A fifty or hundred-mile hop to the next town will be a money-making trip for the suc- cessful salesman, increasing his number of daily calls. The visit of the taxi plane means more servicing and gas and oil and food or refreshments sold to passengers and pilot.- The airport, like the successful garage arid filling station, must cultivate popularity. Some fields charge from one to three cents per horsepower for every plane that lands. But usually such a plan is bad business, as it keeps planes away. The first consideration in selecting the airport site is accessibility. The airport should be located on a main highway but out of the congested area. If, in the case of small towns, it can be reached in, say, fifteen minutes from the commercial cen- ter of the town, so much the better. The second consideration is ample area, which is absolutely essential. The field must be large enough to enable planes to land in safety. And third; but also of vital im- portance, is the nature of the terrain. The field must be level and free from obstruc- tions and have a sufficient number of run- ways, long and wide enough to make land- ing safe, no matter from what quarter the wind blows. Of the nearly 1,500 airports now reported in the United States—and more are coming into existence every week—a. competent authority states, less than 200 are considered perfectly safe in emergency landings or when the wind is from an unfavorable direction. The question of accessibility presents a more difficult problem when the airport is to be laid out near a large town or city. The future of aviation can only be realized by the assumption that the great air ter- minals of the future will justify expendi- tures of millions of dollars for site, con- struction and equipment. They will han- dle a volume of traffic compared with the great rail-terminals of today. They must

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974 POPULAR possess ticket, freight and express offices, custom, quarantine and immigration sta- tions, post offices, baggage departments, news stands, rest rooms, drug stores, res- taurants, first-aid stations, meteorological stations, pilots’ quarters, managerial offices and other equipment. The landing field must be of sufficient area and of an all- way plan to permit the departure of large planes every few minutes of the day and night. As the air mail is the backbone of commercial aviation in this country, and mail pilots at this writing are flying 40,000 miles each twenty-four hours, the prob- lem of providing for the expeditious han- dling of this mail either now or in the future is a vital one in the case of all air- ports in communities that want air-mail service. A prominent postal official is quoted as predicting that all first-class mail will go by air within three years. But at present, on short flights, the transport of air mail between airport and terminal may often take longer than the actual time the plane has been in the air. To over- come this handicap, prominent architects, aviators, engineers and postal officials have recommended the installation of pneumatic tubes between airports and post offices. ’ What size should an airport be and how costly? In the opinion of a large number of experts, the size of the field, provided it meets with the minimum requirements for safety and does not ignore the possibility of future expansion, must depend upon MECHANICS the population of the surrounding district and nearest town. There is scarcely any limit as to cost. An airport may cost a million or more. Hangars and buildings may run up to half a million. But this need not prevent any community from making a start and establishing a first- class landing field at comparatively small outlay. Every town will start with the idea of eventually acquiring a No. 1 rating. Un- der the airport-rating regulations of the department of commerce, the field, to se- cure this rating, should have at least 2,500 feet of effective landing area in all direc- tions with clear approaches and must be in good condition at all times. Or it should have landing strips not less than 2,500 feet long and 500 feet in width, per- mitting landing in at least eight direc- tions at all times, the landing strips not to cross or converge at angles of less than forty degrees. The very minimum of safety for the largest planes is 1,500 feet of runway, but as a matter of fact the run- ways should be 2,500 to 3,000 feet in length. The ideal field would be a mile square, 640 acres. A 160 to 200-acre plot of level land will serve most smaller communities. The builder of an aviation field in cen- tral New York state approached the local chamber of commerce in reference to se- curing a site. The chamber in turn took the matter up with public-spirited citi- zens and leading farmers of the vicinity. A farmer was found who was glad to lease ARRIVING PLANES pnd t UNDERGROUND FOR REPAIRS PLANES ENTER HERE LEVEL of LANDING AREA . GREAT AIR TERMINAL RAILROAD AND MOTOR! ON LOWER’ A Plan for an Underground Airport Terminal with the Cone-Shaped Field Free of Every Obstacle, Including People; at the Top Are Trapdoors through Which Planes Enter and Leave

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POPULAR- MECHANICS 975 4 F i yee: aie LT 2 eer a aS Perspective of a Two-Story Airplane Hangar Developed with a Concrete Ramp, the Second Story Being Used for Small Ships, and the Ground Floor for the Large Commercial Planes a square level plot of 160 acres, free from high-tension wires or other obstructions, at a low rental for a term of twenty years. The promoter of the project was careful also to lease some land on the other side of the highway adjoining the landing field, as a parking site for motor cars. The process of getting the field in shape was that which will be adopted in most instances. A runway was staked out in the direction of the prevailing wind. Then two other runways in the direction of the next prevailing winds. All obstructions, small pines and other trees, ditches and small gullies were removed. Obstacles in the vicinity of the field were marked with red flags. A mowing machine was run over the land which was leveled and graded. A large white circle was marked in the center of the field which could be spotted from the air, designating it as a landing field, with an arrow pointing north so that a pilot flying over the field could see it clearly. A wind indicator also was installed. A field like this one shows how quickly the basis of an airport can be established. Drainage should be accomplished by a grade of about one and one-half per cent and not over two per cent. PERISCOPIC OBSERVATION ROOM GLASS ROOF OVER REPAIR SHOP ON UPPER LEV TERMINAL LEVEL DEPARTING PLANES LEAVE BY THIS OPENING The Underground Terminal Would Contain Railway Lines, Motor and Bus Lines, Pneumatic Mail Tubes, Hangars, a Hotel and Resteurant as Well as the Repair Shops for the Planes

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976 POPULAR Control Board of Street Car with Foot-Operated Speed and Brake Pedals like an Auto FOOT-CONTROLLED STREET CAR OPERATED LIKE AUTO Increasing speed, safety and comfort, a foot-controlled street car, operated like an automobile, has been introduced in Al- bany, N. Y. On the floor of the trolley car are the controller pedal, correspond- ing to the accelerator of the automobile, a brake pedal, reverse control, and emer- gency brake, all operated by the feet. The gong, sander, magnetic brake and brake- locking valve are manipulated by hand. PLANT FOOD DOUBLES GROWTH Containing the extracts of several chem- icals essential to plant growth, a plant food now is available, MECHANICS SIXTY-THREE-STORY BUILDING IS MOST ECONOMICAL For city realty where land is worth $200 a square foot, a sixty-three-story building will yield the greatest return on the investment, according to results of a survey for the American Institute of steel construction. Where land is worth dou- ble that amount, a_ seventy-five-story building would pay best. The engineering difficulties of a building 2,000 feet tall, or nearly 200 stories, could be overcome, the survey showed, but such a structure would not be feasible economically, and even a building 131 stories high would not return a net income. An eight-story building would cost $22,193,000 to build and would yield 4.22 per cent on the investment, while the sixty-three-story building, costing $39,100,000, would return 10.25 per cent. For higher buildings the return decreased, although on higher land values, the sev- enty-five-story building was found to give the greatest return. The limit to build- ings is imposed chiefly by the elevators, as the cables gradually become too heavy for greater heights, while the normal hu- man eardrum cannot stand an elevator speed over 1,500 feet per second, necessary in a 2,000-foot building. REVOLVING DINING TABLE TRAY DOES WORK OF SERVANT Doing the task ordinarily required of one servant, a revolving serving tray for the dining table has been made in Ger- many. The tray has double ball bearings and is equipped with knobs at the edge to facilitate turning by any person seated about the table. which, tests show, will double the rate of growth and the size of water and garden plants. The preparation comes in liquid or solid form and was de- veloped primarily for water lilies, but has been found equally effective for Dishes from which guests are to be served are placed on the tray which, when turned, brings the desired food be- fore the person re- volving the con- tainer. It may be covered with felt or a doily to protect the surface from other forms of plant blemishes from hot life. A Revolving Serving Tray for the Dining Table, Which Allows Guests to Help Themselves dishes.

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POPULAR MECHANICS 977 Spectators at a British Outboard Motorboat Race Are Seen Dodging for Cover as One of the Boats Leaped Out of the Water and onto the Bank When-the Pilot Was Thrown Out SPEED BOAT LEAPS ONTO BANK WHILE OUT OF CONTROL Spectators at the outboard motorboat races at Rickmansworth, England, re- cently were afforded an extra thrill when one.of the boats leaped out of the water and onto the bank, landing among auto- mobiles and onlookers. The boat came catapulting through the air from the water when the pilot was thrown out while mak- ing a sharp turn.. Neither pilot nor spec- tators were injured. BEAVERS STOP LAKE SEEPAGE WHEN ENGINEERS FAIL When. engineers and members of the state game commission three years ago failed to stop the seepage from Goose lake, one of the greatest trout lakes in the state of Washington, they decided to let beavers do the task and liberated a pair there. An examination recently showed -the_ in- creased colony had built a dam which pre- vents the water from running into a crater and makes the water level several feet higher. The animals still are improving their dam although it is about water-tight, and are also trying to plug another hole in the bottom of the lake. The lake is used by the state as a breeding and hatch- ing place for .trout. JEWELERS’ REVOLVING STAND KEEPS TOOLS IN ORDER For the use of the watchmaker and jew- eler, a revolving tool stand on a ball-bear- ing base now is on the market. The stand is of hardwood and has space for from sixty to 150 tools which fit in holes of varying size, keep- ing them always within sight and reach of the worker. The stand also con- tains bottles to hold materials or small parts and serves to keep delicate instruments,and constantly required tools off the workbench. @ Radium is found in extremely small quantities in living plants and animals, ac- cording to a Russian scientist.

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Bucking a Drift That Has Filled a Railroad Cut; Winds Add Their Toll to the Annual Cost of Keeping the Lines Open, Especially Where Depressions Catch the Snow By PAUL D. “TT’S snowing again. A stiff gale is blow- ing and the snow is drifting badly. Looks as though the trains will need some help.” A mirthless grin spread over the face of the Pennsylvania railroad train dispatcher at Grand Rapids.. “I thought we’d hear from you before night,” he barked back. “Well, don’t worry. _ The ‘felt-boot’ boys will dig you out. So long.” The phone call was from a northern Michigan town, far up in the snow coun- try, where drifts, ten, fifteen and some- times twenty feet high, pile into the rail- road cuts, choking traffic and challenging the crews of felt-boot boys, the railroad’s name for the snow-fighting squads, picked men who know’ every inch of the tracks and who can stand the rigors and bitter cold of rides with the plows in the dead of night and in sub-zero temperatures. The snow battle is a winter struggle for many railroads, a fight that costs thou- 978 PADDOCK sands of dollars annually. Its hardships and technique are well illustrated on the Pennsylvania’s Michigan line, where the tracks run consistently northward, giving the prevailing winds that sweep across the land at right angles, a clear chance to fill the cuts with snow. In one stretch, only forty-eight miles long, there are 172 cuts, open invitations to drifts. In spite of the heavy snows of last winter, more than ninety per cent of the line’s passenger trains made schedule time during the winter months, and freight traffic was kept moving. The first call for help is the signal for the snow battle to begin. The dispatcher calls the various stations along the line, jotting down the reported temperatures and the snow measurements for each place. The power man, in charge of en- gines, calls for a locomotive and a plow, the crew is summoned, the dispatcher clears the line for the snow fighters and

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they are off, frequently in the dead of night when the tracks are less occupied with other traffic, or in a blinding storm with a roaring wind hurling sleet and snow upon the rails almost as fast as the plows can remove it. The plow, of course, is at the front, behind is the lo- comotive and then the ca- boose. The engine cab and space between the cab and tender are hooded with a big canvas shield that also covers the coal to keep out the snow and ice. LU The front windows of the S cab are boarded up to pro- tect them from chunks of ice and hard snow. The engineer and firemen are literally bottled up inside their engine. The train is directed by the men in the plow. They communicate with the engine crew by electric signals. Rotary Plows Fighting the Drifts on the Union Pacific and, Below, inside the Operating Cabin of a Pennsylvania Pusher Plow “All set?” asks the conductor who sits on the right side of the cupola, far to the front of the plow. “O. K. here,” reply the men in the plow’s cabin. Two maintenance-of-way men are 979

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980 usually carried on the plow beside the two who sit up in the cupola. The con- ductor reaches up, and pushes the electric button twice—the starting signal. Two short blasts of the engine’s whistle reply, and the snow train clatters out of the yards. The odd-looking train, with its ugly- faced knife-nosed plow at the front, has left the city and reached the main track. Five buzzes on the electric signal tell the engineer to increase speed. -Through the small windows in the cupola, the head- light, a powerful’ beacon attached to the front of the plow, shows the storm a whirling mass, obscuring the rails and the right of way for yards ahead. The men rub the windows every few minutes with waste, saturated with wood alcohol to keep the interior surface free from frost. The 100-ton plow is springless and_it bumps and jolts as it strains through the snow. Chunks hurtle against the sides and strike the windows. The noise is ter- rific. Both men are anxiously straining their eyes to pierce the blinding film out- side. The order is to plow and flange the main line and passing sidings between Grand Rapids and Cadillac. The flanger POPULAR MECHANICS is the smaller hidden plow that extends down from the bottom just ahead of the rear trucks. It is V-shaped and slices out the snow and ice between the rails. It is lowered to about three inches above the rails when the plow is in operation, and so must be raised when the train ap- proaches planked road crossings, switches and frogs. The big wings that stick out at the sides of the plow must also be pulled in at mail cranes, sidings, station buildings and other obstacles along the line. For this reason, the men who op- erate the levers that perform these func- tions by means of compressed air from the engine, must be familiar with the track. If the obstructions are not visible, the crew must know where they- are, so that the flanger and the wings can be withdrawn to safety. A green light looms hazily out of the foreground. “Get your wing in,” the con- ductor yells at his companion. In flies the brakeman’s lever, and the ponderous wing that normally protrudes at an angle of thirty degrees, strikes the side of the plow with a crash as the train shoots by the switch at thirty miles an hour. The hiss- ing of the compressed air, the crashing of the snow, the roar and creaking of the ve ‘tone » Northern Michigan Offers the Snow Fighters Some of the Stiffest Battles of the Year; Winds Often Fill Cuts like This, and the Snows Are Deep on the Level

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Is ie ‘e POPULAR MECHANICS 981 Exterior of a Pusher, Showing the Long, Sharp Nose, the Lookout Windows, Searchlight and the Wings, Folded Back Here and on Each Side behind the Nose plow make conversation in normal tones impossible. Orders are yelled at the top of the voice, although the men are as close together as they would be in a submarine. “Look out, we’re going into a big one” —and as the plow buries its nose into a drift, there is a lunge and slackening of speed. The impact is almost violent enough to throw the men out of their seats, but they are braced for it. There are no lights inside the plow when it is operating, and the only gleam visible is that of the headlight, but this is now hid- den as crashing breakers of snow cascade over the plow, plunging everything into total darkness. Another drift! This time the speed decreases until there is danger of stalling. “Get your wings in quick,” shouts the conductor as he pulls at his own lever. Both wings fold inward just in time. Stalling in a big drift with the wings out is “fatal,” one of the unpardonable sins of snow fighting, for with the wings out, the train cannot back up or go ahead and the plow is stuck, may be for hours, until it can be dug out by hand. Pulling the wings in reduces the side pressure. The big road locomo- tive snorts and the plow groans through the tightly packed mass of snow. But still the inside of the cupola is in darkness. The snow has stuck to the plow and the windows. The conductor gives two buzzes. The train stops on the other side of the cut and the maintenance-of-way men, who have been hugging the stove back in the plow cabin, climb out and shovel the snow away from the windows and the nose of the plow. The moment’s lull gives the conductor an opportunity to confer with the engineer. The engine is a shapeless mass of snow and ice. Under the canvas canopy, although the ther- mometer is well below zero outside, the heat in the engine cab is oppressive, and both the engineer and fireman are sweat- ing. “If that last one had been 200 feet longer, we never would have made it,” de-

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982 POPULAR MECHANICS a half during last winter. At one point, there was a total snowfall of nearly forty-eight inches during January and February, and twenty-foot drifts were encountered at many places. Where it is practical, many lines pre- fer the pusher plow, for, although it does not hurl the snow so far out of the right of way as do the big rotaries with their huge blades, it'can be op- erated more rapidly. The rotaries function through a gear arrangement of limited speed, but the pushers can be shoved ahead as fast as the snow will allow. The technique of snow fighting on the railroads changes but little from year to year, and the task is about as difficult now as it was a decade or clares the engineer, wiping his face and getting a breath of fresh air for the first time since the train started. The venti- lator in the cab is covered with canvas so circulation inside is none too good. Sometimes the plow gets stuck even when the wings are pulled in. In such a case, the train is backed up for a mile or so and the plow makes a run at the drift, bucking into the pile at fifty or sixty miles an hour. The most efficient plowing speed is twenty-five or thirty miles an hour. Off again, plunging through one drift after another. A little town flashes by, just a few lights showing through the gloom, one in the operator’s office at the station, and the other, the block light. The station agent waves a greeting as the big plow roars through. He is glad to see the plow, for it means an open line and less worry. The five big pusher plows on the Penn- sylvania’s Michigan line cleared nearly 9,000 miles of track in three months and © International News more ago. But improved Snow Clogs the Engine Cab as Well as the Tracks; Engines Used behind the ; Pushers Are Generally Sheathed in Canvas to Protect the Crew and Coal weather service has aided, ‘as the plows can be in order and often at the scene before the snow has had time to pack and freeze. ARTIFICIAL DAYLIGHT IS BEST FOR COLOR MATCHING Artificial daylight electrically produced was urged before the Illuminating Engi- neering society as a substitute for the tra- ditional north skylight favored by artists for color matching. Tests have shown that daylight from the northern sky, far from being standard, actually varies in in- tensity and character each hour of the day. White light, corresponding to noon sun- light on a clear day, was found to be the proper standard for accurate color match- ing and color discrimination. While this is available naturally only an hour or two a day, tungsten incandescent lamps and color filters can produce ‘it artificially whenever needed. Artificial northern sky- light, like the real article, is bluish, mak- ing certain colors appear bluer and sup- * pressing certain other colors.

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~s SY? SFP cmt ~~ POPULAR MECHANICS 983 U. S. HAS THE WORLD’S LONGEST DIRECT PHONE CIRCUITS With the completion recently of a di- rect telephone circuit from New York to Tampa, Fla., a distance of 1,225 miles, an- other link was added to the telephone sys- tem that connects distant cities directly, without the necessity of switching calls through intermediate points. The direct- circuit network already includes the world’s longest continuous telephone line, or rather twin lines, for there are two such circuits, each 3,412 miles long, between New York and Los Angeles. Supple- menting this direct coast-to-coast service, there are four 2,600-mile circuits from Los Angeles to Chicago and _ thirty- three direct circuits between Chicago and New York. This latter group re- quires 29,882 miles of wire. Among other long direct circuits is one of 1,900 miles from New York to Dallas; two of 1,700 miles from New York to Havana, includ- ing in their mileage the world’s longest submarine telephone cable, from Key West to the Cuban capital; four of 1,400 miles each from New York to Miami, and three of 1,450 miles each from New York to New Orleans. These lines enable dis- tant calls without delay. WHEEL CHAIR FOR INJURED DOG AIDS IN ITS RECOVERY Convalescent dogs now enjoy many com- forts, including wheel chairs. “Jackie,” pet of a Dallas, Tex., family, was run over by an automobile and crippled. A wheel chair was provided, and the animal, while A Wheel Chair Provided for a Dog That Was Injured in an Automobile Accident unable to walk, learned to pull himself about with his front paws. Three Views of the All-Metal Top, Which Slides into the Body of a Convertible Coupe CONVERTIBLE COUPE PROVIDED WITH A METAL TOP Motorists who like an open coupe in fair weather and a fully inclosed one in bad weather will be interested in a converti- ble coupe with a metal top now on the market. The convertible feature is gained by dropping the top partly into the body, the forward portion of the roof extending above the body and serving as a wind- shield for the deck seat by reason of the transverse window in this part of the roof. The metal top has its lower edges flared outward at sides and rear, this flanged portion normally pressing against a rub- ber strip at the edges of the body surface, to provide a waterproof junction. The flange is wider at the rear to give sufficient clearance for the top when it is moved backward into the body. When down, the top has the same ‘backward tilt as the for- ward windshield. When the top is up and the door windows raised, the car conforms in appearance with usual coupe-body de- signs. The raising and lowering of the top is accomplished as easily as moving the deck seat.

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Tilted Coal Truck Fitted with Chutes from Which Baskets Are Filled with- out Shoveling COAL TRUCK FILLS CONTAINERS WITHOUT HAND SHOVELING Delivery baskets are filled from German coal trucks without hand shoveling by means of a device at the rear of the truck. The truck itself is tipped up and the coal pours out through two hoppers into the baskets which are held beneath them in a fixture attached to the truck. CHEMISTRY TO OUTLAW WAR SAYS NOTED SCIENTIST Modern chemistry and modern aero- nautics have virtually made another war impossible, for they would render armies useless, Francis Patrick Garvan, of New York, recently awarded the Priestly medal, the highest honor in chemistry, has de- clared. In case of a modern war between great powers, he said, it would be foolish and useless for a battleship to leave its dock or for an army to take the field, be- cause modern chemistry and the air- plane could destroy both. He advocated strengthening the possibilities of both agencies as weapons of war in order to discourage offensive wars. POPULAR MECHANICS ENGINE BUILT LIKE A BARREL TO HELP FLYERS A barrel engine, which, unlike previous motors of the type, has a fixed barrel, was demonstrated at the British Aero Show, in London. A similar engine, the “Almen,” was flown several years ago in America, and another was flown recently in Switz- erland, but both these had revolving bar- rels, and met the same objection as was applied to the now discarded Gnome ro- tary engine. The new motor, which has been tested successfully in a six-horse- power compressed-air-driven model, is a radical departure. The six cylinders are arranged lengthwise around the shaft in one end of the barrel. The pistons, mov- ing back and forth in them, impart un- dulating or oscillating movements to a ring fitted with teeth. There are four toothed rings which take up the oscillat- ing motion and transform it into shaft revolutions. The speed of the shaft is controlled by the ratio of teeth in one of the ring pairs, the test engine producing 500 revolutions for every 2,500 piston cycles. The engine, it is claimed, can be, equipped to operate either on gasoline or heavy oil as easily as any other motor, for the cylinder and valve end conforms to standard practice, save for the cylinder arrangement. The advantage claimed for the barrel type is the very small frontal area, which causes less wind resistance and makes nose cowling for an airplane more practical. In large units, it is claimed that another cylinder and piston unit ,can be placed on the other side of the oscil- lating member. RUBBER TAIL LIGHT FOR TRUCK PREVENTS BREAKING ¥ Tail lights for trucks, set in a rub- | ber base to prevent ; breakage, now are on the market. The rubber frame bends when an obstruc- tion is encountered. The light is proof against water and dust as well as vi- bration. s Tr) @ = —_ ~n ea *

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By JOHN T. BRADY HOOTING a rocket from the earth to the moon is no longer merely a fantasy of the mind. In fact, the first shot has been fired in what prom- ises to be the most spec- tacular “battle of the century”’—man’s strug- gle to conquer interplan- etary space. And as a result of the success of the experi- ment, Prof. Robert H. Goddard, of Clark Uni- versity, claims that he has now solved all the major problems of ac- complishing such an amazing feat. Moreover, he declares that the first practical test, outside a laboratory, of a working model of his rocket at Worcester, Mass., proved to his own sat- isfaction and that of other scientists who witnessed it, that a larger rocket of simi- lar design operating on the same principle can be constructed which will have suffi- cient velocity to escape the earth’s attrac- tion and soar to any desired altitude—to the moon or any one of the planets in the solar system. Startling, indeed, are such statements, even in this age of scientific wonders. Yet, coming as they do from a conserva- tive, cautious scientist, with a high reputa- tion at stake, and who has spent twenty years in research and experiment on the problem of reaching extreme altitudes, they must be given serious consideration. And one needs no other stimulant to the imagination to conceive that in the not distant future passenger-carrying air- Prof. Robert H. Goddard, of Clark University, with Model of Rocket He Has Devised to Explore Atmosphere at Great Heights planes propelled by the rocket-principle engine will shoot across the Atlantic, the Pacific, or the United States in a few hours, and that eventually man may jour- ney to the moon, or Mars and Venus. Professor Goddard describes the work- ing model of his rocket as being nine feet long and two and one-half feet in diameter, with an outer shell of aluminum, highly polished and tapered at the nose to offer the least wind resistance. Inside the shell is a highly complex mechanism, the result of many years of study and experiment, but Professor God- dard is maintaining strict secrecy as to how it works and the nature of the pro- pellant that he is using. Explaining the reason for this secrecy he said: “There are many things about this great undertaking which cannot be made pub- 985

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eg be - ii 986 POPULAR MECHANICS lic at this time if the United States would maintain its supremacy in this field of scientific achievement and retain secrets of physics that may prove of inestimable value in safeguarding the life of the na tion in case of war.” He said, however, that the propellant he is using is something new, a combina- tion of liquids and gases that has taken him nine years to develop, and that the propelling force is not a series of explo sions, but is continuous. No high-powered machinery was used to give the rocket its initial lift skyward. It was launched from a sixty-foot steel tower, with guide rails, under its own power, and the initial velocity was up- ward of five miles per second. It carried instruments for recording the altitude which it reached and the temperature there, and the whole apparatus was brought safely back to earth by para- chutes and was recovered immediately. “By George, it was a tremendous thrill to watch it go,” exclaimed Professor God- dard. “It is almost indescribable. Natu- rally there is considerable noise when it is being lifted which might be mistaken for a big explosion. But the sound as it hurtles along in flight is more like the moaning of the projectile from a big gun, or a long-drawn-out rumble of thunder. Professor Goddard then stated that the term “moon rocket,” as applied to his in- = _ . o> Inset Shows Inner Mechanism of One of Professor Goddard’s Early Experimental Rockets, and Below Is the Scene of a Recent Test; Rockets Are Launched from Guide Rails on Sixty-Foot Tower ven tha “Ta pos sor rea wa vel tin bit the de re pr he

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POPULAR vention, is somewhat of a misnomer, and that it would be more correct to call it a “rain rocket,” because the practical pur- pose of his rocket experiments is to find some method of exploring the upper reaches of the earth’s atmosphere for val- uable meteorological data. But in the very next breath he admitted that his ul- timate object, the highest goal of his am- bitions, is to send an aerial messenger to . the moon and then to the planets. “But suppose you eventually succeed in developing a rocket powerful enough to reach the moon; how are you going to prove that it arrived at its destination?” he was asked. “The only reliable procedure would be to send a charge of flash powder to the dark surface of the moon, when in con- junction (that is the ‘new’ moon), in such a way that it would be ignited on impact. The light would then be visible in a pow- erful telescope,” he replied. Speaking of the practical value of de- veloping rockets by means of which the earth’s upper atmosphere can be explored, Professor Goddard pointed out that the greatest altitude at which soundings of the atmosphere have been made by bal- loons, is only about twenty miles—but a small fraction of the height to which the atmosphere is supposed to extend. “Above that altitude lies the most interesting, and in some ways the most important part of our atmosphere,” he said. “Some authorities say the temperature begins to increase with height after a cer- tain altitude is reached, and that it runs up as high as 1,000 degrees centigrade. Others say the temperature decreases tre- mendously. The earth’s outer atmosphere may be very hot although nearly a vac- uum. But we have no. direct evidence about it. Nor do .we know how the pres- sure falls off or the composition of the air beyond a height of about twenty miles. “Another thing is the electrical nature of the upper atmosphere. Something like sixty miles up, there is a very rarefied gas charged with electricity and without it long-distance radio transmission would have to go out of business. “Other problems are the nature of the aurora, the nature of radioactive rays from matter in the sun, as well as the ultraviolet rays from that body.” MECHANICS 987 ELECTRIC PARACHUTE FLARE SOLVES FLYING PROBLEM The Pilot Is Holding an Electric Parachute Flare for Navy Planes Which Continues to Burn after Landing in Water An electric-lighted parachute flare for navy planes, tested recently at the naval air station, Washington, solves, in the opinion of pilots, the problem of making night landings on water safe. The ordi- nary magnesium flare is extinguished as soon as it reaches the water and seaplane pilots have felt the need of a light that would continue to burn and mark the water level on which they were trying to land. The new flare, which is hardly larger than the palm of the hand, consists of a powerful electric light, operated from a tiny battery containing sufficient energy to keep the lamp burning for approxi- mately an hour. When released from the plane, the light floats down beneath its parachute, with the rays directed down- ward on the water, but when it lands a cork float turns it over and the beam is di- rected upward. Lieut. A. P. Storrs, who made the tests, accomplished a half dozen successful landings at the Haines Point seaplane harbor, in front of the air station, using from one to two flares each time. @ Names and addresses of manufacturers of articles described in this magazine will be promptly furnished, free, by our Bu- reau of Information.

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scapaipnaninne teaudniahiaiieiali 988 POPULAR MECHANICS barge and attach it to the fleet. This can be done without stop- ping the barge fleet. Wireless telephones eventually will con- nect the towboats. Electrical equipment for these novel tow- boats was designed by engineers of the Westinghouse Electric and Manufacturing company. Power for the generators is furnished by Diesel engines which burn crude oil. The smaller towboats have a fuel consumption at full load of about three gallons per hour, which means a fuel bill of approx- imately eighteen cents an hour. The drive on each side of the towboats consists of a chain with blades attached in a manner re- sembling the method of attaching buckets on a conveyor. Separate motors operate the two chains. By reversing one drive, the tow- boats can be turned around in their own length, and because of their small draft, the smaller towboats can reach docks una- vailable to steamboats. PLATINUM SUBSTITUTE FOUND IN “KONEL” Above, an Electrically Propelled Towboat, and, Below, the Chain with Blades Giving It a Caterpillar Drive CATERPILLAR BOATS ON RIVER PULL BOX-CAR BARGES Application of railroad methods to river transportation is attracting the attention of river men and shippers of freight along the Mississippi, the Ohio, the Missouri and other inland waterways. The very latest creations in river-boat construction are electrically propelled towboats with caterpillar drive, and barges that look like railroad box cars. Small electric tow- boats, which draw only two to three feet of water, act as switch engines and collect the barges from shipping points along the smaller streams. The “train” or fleet of barges is then towed to distant points by larger towboats of similar or other de- sign. As the barge fleet travels up or down a river, one of the smaller towboats detaches a barge from the fleet and takes it to a dock, where it may pick up another “Konel” is the name applied to a new metal which is being used extensively as a substitute for platinum in the manufacture of filaments for radio tubes. It is credited with being much stronger than other metals at high tem- peratures and can be used in the moving parts of internal-combustion engines and other extremely hot places. Originally it was developed as a platinum substi- tute, but was found to be harder to forge than high-speed steel, and to be very tough at high temperatures, when most metals lose their strength. Engineers be- lieve the metal will be useful in making valves, valve stems and-turbine blades. As a substitute for platinum, they esti- mate the metal represents a saving of $250,000 a month, because platinum costs $180 an ounce while konel costs $15 a pound. Tubes equipped with konel fila- ments may be operated 175 degrees colder than those with platinum fixtures. Konel is also resistant to most acids. a ti a i i ae

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TUNGSTEN CARBIDE PENETRATES THE HARDEST METALS Tungsten carbide, the hardest com- pound known to science, for years a mere curiosity, has found a commercial use, for with it hard alloys, including manganese steel and armor plate, can be machined in lathes, planers or shapers. Tungsten it- self, as used in electric-light filaments, is so soft that it can be drawn into fine wires, but when combined with carbon, it makes a substance second in hardness only to the diamond, and will scratch a sapphire. At first it was too porous to stand the strain imposed on a cutting tool, but this diffi- culty has been overcome, and in its more useful form it is known as “carboloy.” While many operations impossible with any other cutting tool are performed with the compound, it has limitations as it will break down under very heavy pressure. CAMERA REVOLVES TO “SHOOT” FROM ANY POSITION Mounted on a large wheel that is re- volved by a crank in a still larger wheel, Hollywood has a moving-picture camera that photographs from any angle or posi- tion in which it is placed. It is powered by motor and may be used, for instance, to create the illusion of a topsy-turvy world by exposing the film as it is revolved. A Motion-Picture Camera That May Be Revolved to Shoot from Any Position or Angle POPULAR MECHANICS Upper Berths for Sleepers Provided with Windows, Which Furnish More Air Than Ventilators WINDOWS FOR UPPER BERTHS ADD COMFORT TO TRAINS Upper berths of sleepers on one western road now are equipped with windows to add to the comfort of passengers. The windows are smaller than the regulation car window, but provide more circulation than the ventilators in the roofs, com- monly employed to supply the occupants of the uppers with fresh air. OVER NINE MILLION VISITORS TO WASHINGTON MONUMENT During the forty-one years that the Washington monument has been open to the public, 9,098,118 persons have visited it, recent figures show. The daily average has been 615 persons since 1888, and the greatest number in one day was 10,078, who went to the top on April 1, 1929. More than 2,500,000 energetic sightseers climbed to the top, while the remainder took the elevators.

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This Folding Ironing Board Has a Metal Hold- er for Hot Irons to Pre- vent Scorching and Fires; It Folds Up with One Motion for Storage in Small Space The Cabinet Above, Furnished in Va- rious Colors, Holds a Package of 125 Small Towels of Absorbent Material for Many Uses about the House; They Save Laundry Bills and Extra Steps; the Cabinet Takes Up Little Room and May Be Placed in Any Convenient Location Boiling Eggs Exactly the Desired Time Is Easy in This Aluminum Kettle; a Simple Device at Top Is Set, and at the End of the Period, the Eggs Automatically Are Lifted Out of the Water Here Is a Vacuum- Cleaner Bag with a Side Vent Opened and Closed by Interlocking Clasps for Quickly Emptying the Dirt; the Vent Saves Removing the Entire Bag, Prolongs Its Life and Protects the Oper- ator from Dirt 990

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Home lass By Pressing a Spring, the Top of This Double-Purpose Tray Can Be Raised and Tilted at Various Angles for Reading; the Sturdy Stand Prevents Tipping; Below at Right, Is a Compact Motor Unit for Beating, Extracting Juices, Slicing Vegetables, Grinding Meats and Polish- ing Silverware; the Set Weighs Only Forty Pounds and Is Economical to Operate With a Portable Tip- ping Stand for the Washtub, the Task of Filling and Emp- tying the Container Is Greatly Simplified ; Clamps Hold the Tub Securely in Place While ng Quick Remova

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992 POPULAR A Toaster Which Heats the Inside of a Bun Instead of the Outside for Toasted Sandwiches TOASTER HEATS INSIDE OF BUN INSTEAD OF OUTSIDE Toasting the interior of a bun to receive the filler of frankfurter is the purpose of a novel toaster now on the market. It con- ‘sists of an upright bar inserted in a long bun, or a flat plate over which a sliced round bun is slipped. Makers claim that sandwiches prepared in this way are more palatable than those with the outside toasted, and less time is required for the operation. PILOTS FLY SPIRAL COURSES WHEN BLINDFOLDED Experiments by the national advisory committee on aeronautics have demon- strated that airplane pilots, when blind- folded, will nearly invariably show the same tendency to deviate from the straight path of flight and take up a spiral one, that a blindfolded person does when in motion on the ground. The blindfolded pilots, accompanied by a reserve pilot who acted in emergency, were found to bring the ship after a short flight into a properly banked turn, and most of them made the turns shorter and shorter with a tendency to turn the plane into a diving spiral. About an equal number of right MECHANICS and left turns were made and the right or left-handedness of the subject pilots apparently had no relation to such turns. The experiments demonstrated that mus- cular balance plays a relatively small part in flying, except in correlation with visual reference. Pilots flying in the dark, it was pointed out, have this visual reference in their instruments, which provide an artifi- cial horizon and show the course the plane is taking at all times, so that the blind- fold test is more stringent than any pilot is likely to face in actual flight. FOOT IMPRESSION ON INKED PAD REVEALS ILLS Taking an impression of the sole of the foot to reveal pedal troubles without re- moving the hose is made possible by the “pedograph,” a wooden cabinet contain- ing an inked pad. The foot is placed on a rubber sheet beneath which is a chart and when the weight of the body is pressed on the apparatus, the impression of the foot is left on the chart when it comes in contact with the pad on the underside of the sheet. It shows the condition of the arches, bearing points of the foot, callous spots and the degree of its elongation or widening. Making a Foot Impression on an Inked Pad to Show Foot Troubles without Removing the Hose

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A new series of twenty steam locomo- tives for the Canadian Pacific railway, the first of which was recently placed in serv- POPULAR MECHANICS 993 ' GIANT LOCOMOTIVES SQUEEZE THROUGH TUNNELS pass under low bridges. The engines are in the 2-10-4 class, with ten main drive- wheels, and, in addition, twin-cylinder HINGED ORAFT DEFLECTOR LOWERED TO CLEAR STATION ROOF AND TUNNELS BELL OW SIDE TO CLEAR TUNNEL ROOF An Engine So Large That It Was Necessa ry to Hinge the Draft Deflector, Slope the Cab Walls Inward and Placé Bell and Whistle on the Side to Enable It to Pass through Tunnels ice, have carried locomotive building to such large dimensions that considerable effort was required to produce a shape that would squeeze through existing rail- road tunnels, and get into passenger ter- minals without scraping the roof.’ The sidewalls of the engineer’s cab curve in- ward to keep them from rubbing tunnel walls, and the bell and whistle, instead of being placed on top-of the boiler on the center line, have been moved down. the side until their highest points come within the cab-roof clearance line. The stacks also are fitted with hinged smoke deflec- tors which can be turned back and down to get through tunnels, just as tugboats are sometimes built with hinged stacks.to booster engines on the tender wheels to increase the tractive force when starting a heavy load and then automatically cut out when a speed of twelve miles an hour is reached. The locomotives weigh 750,000 pounds, making them the largest two- cylinder railroad engines ever built in the British empire, and develop a tractive force of 78,000 pounds, in addition to the . 12,000 pounds supplied by the booster. - Rated at over 4,200 horsepower, they are eighty-five times as powerful as Steph- enson’s. famous “Rocket,” yet this has been achieved with only eighty times the weight, and, incidentally, at an expendi- ture only forty-five times the cost of the original engine. TISSUES OF FOWL KEPT ALIVE FOR SEVENTEEN YEARS Tissues, taken from a fowl seventeen years ago, still are kept alive by Dr. Alexis Carrell of the Rockefeller Institute of New York. The tissues taken from the heart of a chicken are kept in a vault maintained at about blood heat, and not only live but grow so fast under rigid conditions affording proper heat, light, moisture and food, that they must be trimmed frequently. Portions of the tis- sues at times have been transplanted to other small flasks similar to that in which the original is kept, and they likewise are thriving. Every few days the tissues are freed from their own waste which in time would be destructive, and the nutrients are supplied through the medium in which the tissues are bathed, the process being similar to that which kept the tissues grow- ing when they were part of the living chicken. Then the blood supplied nutri- tion and the circulation removed the waste. So expertly have the same meth- ods been simulated, that Doctor Carrell believes the tissues can be kept living in- definitely. Human tissues might be kept alive in similar manner, Doctor Carrell said, adding that the reason the cells far outlived the body of which they were a part is that nutriment can be given and waste removed under ideal conditions, something that would not be possible in the living body. ‘

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Courtesy -Mahoney-Ryan Aircraft Corporation Girls Are Skilled -in Covering Wings, Fuselage and Tail Members; Below, Men at Work .on a Bellanca “PMHEY are now,” announced Frank La Vista, general superintendent of the Fairchild Airplane Manufacturing cor- poration, “about to oil up the fuselage,” and before your eyes another of the un- expected things in an airplane factory begins to take place. What layman ever heard of oiling up the gaunt steel tubing structure of fuse- lage and wing? Yet they do just that, and it takes forty-four gallons of linseed oil, heated to just below the boiling point, to do the job. But why the hot oil? Because, the su- perintendent explains, the inspectors can tell by feeling each longeron, strut and brace, each spar and rib, whether the oil is passing through it. For the oiling job is just a quick and clever way to determine whether the welders did a good job, and whether 994 ame every section of+ tubing in the framework of body and wing is air and mois- ture-proof, a precaution against inside rust. As the welders put the parts together, an eighth- inch hole is drilled at every point where tubes are joined, and an eighth- inch plug is inserted at the top of the fuselage, at the end of the tail, and at the top of the front wing-beam member. The wing and top fuselage plugs are at the highest points when the ship is resting on the ground, and the plug at the tail skid at the lowest. The oil pump is attached to the latter, and when oil begins to run out of the top holes the inspectors know that every steel tube is full.

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After the test, the oil is drained out at the tail, the holes plugged, and the metal frame given two coats of aluminum enamel. Building an airplane is a job for specialists and experts. It takes trained men from other in- dustries, sheet-metal workers, machinists, welders, woodwork- ers, cabinetmakers, upholsterers, cloth cutters, seamstresses, paint- ers and others, gives them a spe- cial course in airplane building, and fits them for big business’ newest venture—for multimillion- dollar mergers have, in the space of a few short months, turned the outcast child of a few years ago into a rising young giant. America built 4,049 planes last year; turned out 2,000 in the first few months of 1929, and, at the rate material orders have been placed, the total production for this year may reach 10,000. It takes trained men. and = women to turn out planes; and in every airplane plant in the land, specialists are being created as fast as experienced instructors can turn them out: At St. Louis, where the Mahoney-Ryan plant moved after Colonel Lindbergh flew a Ryan to Paris, men and women of seventy trades fashion and as- semble the 5,506 parts which, exclusive of motor, assembled accessories, instru- ments, nails, screws and cotter pins, go to make a Ryan “Brougham.” At Wichita, which claims the title of “airplane center of the world,” factories are as thick as automobile plants at De- troit, and this one town turns out more planes in a year than the entire country did only a couple of vears ago. How does one get to be an airplane builder? The first question every appli- cant is asked is, “What can you do?” and Checking Balance and Pitch of a Propeller; Adjusted That a Piece of Paper Causes It to Turn It Is So Nicely if the answer is, “Oh, I can do anything mechanical,” the applicant probably will be shown the door. For building the in- tricate framework of wood and steel and fabric to which the lives of many pas- sengers must be entrusted is not a job for a jack of all trades. The airplane factories do not neces- sarily want workmen with experience in building airplanes, but they do want men who are to some degree specialists in particular trades. That does not mean there are no openings for the inexperi- enced, for there is a big field for appren- tices to learn under the guidance of more experienced workers. The heart of most modern planes is the welded tube fuselage of special chrome- 995

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POPULAR MECHANICS the Wrights built the engine for the first air- plane it developed one horsepower,-for about thirteen pounds of its weight. That was just enough power to get the ship, with one pas- senger and a small amount of gasoline, off the ground, and the “ceiling” of that orig- inal airplane probably was about as high as the top of the statue of Liberty.. A modern air- cooled engine weighs about one and a half pounds per hotsepower, and all the saving in weight goes toward lifting a heavier plane, more fuel, a pay load, and in reaching a high- er ceiling. It would be easy, however, to use up the excess power in build- Testing a Monocoupe Frame for Strength by Loading It with Heavy Bags of Sand and Metal molybdenum _ steel. With a tensile strength approximately double that of ordinary steel and many times the strength of wood, it is not only lighter but is used in sizes of correspondingly smaller cross- section area. To weld such delicate tubing properly requires the best of specially trained welders. A man who can weld street-car track joints or steel building beams, and do a satisfactory job, may lack the delicacy of touch and the ability to turn out the kind of joints the airplane factory demands, for a good weld must be stronger than the tubing itself, and frequest tests of parts make sure that it is. Every pound that goes into the build- ing of an airplane means one pound less of fuel or pay load to be carried. When Although Showing the Evolution in Steel Tubing; the Tubes at Right Are Much Thinner, All Have the Teme Tensile Strength ing the ship, if planes were built like au- tomobiles, wagons, houses, or anything else that has been built before. It is because they are not, that specialists are needed, not only in the factory but in the engineering and design departments. Consider the wing, on which the air- plane’s ability to fly depends. Engineers for years have used trusses and cantilever great construction in buildings and

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POPULAR Courtesy Mahoney-Ryan Aircraft Corporation MECHANICS ; 997 Putting the “Sea Legs” on a Ryan Plane; Ships of This Type Are Being Used in Alaska, China and Other Distant Countries Where the Terrain Is Hazardous bridges, but when the modern airplane was developed they turned out trusses and cantilever wings so delicate that, in one successful glider, the wing ribs are made of “kraft” paper, yet so strong that an internally braced structure, seventy, eighty, or a hundred feet long, can be pulled through the air at better than a hundred miles an hour without breaking or bending. One sport plane has a wing built up of spruce ribs, each weighing but two and three-quarter ounces. Yet these tiny trusses are so perfectly made that each will support a 200-pound weight without deflection, and, if the load is evenly dis- tributed, hold up from 250 to 275 pounds without failure. The efficiency of wing designs has gained enormous impetus from the rapid development of cabin and open-cockpit monoplanes. Although, of ships in actual service, biplanes still outnumber mono- planes about two to one, practically all cabin ships are now monoplanes, Of the 850 cabin ships manufactured in 1928, only sixty-nine were biplanes, and in the multi-engined transport-ship class, only five out of fifty-eight air liners were bi- planes. In the small open-cockpit field, however, the vast majority of the 2,348 planes built during the year were. bi- planes, for only 171 of them had a single wing. Aviation engineers have turned to the monoplane largely because of its greater aerodynamic efficiency. Ii built as a full- cantilever, internally braced, it elimi- nates struts and flying wires with their drag, which cuts down speed, and in such a thick wing ample gasoline tanks can be installed, leaving more room in the fuse- lage for the pay load. While the metal fuselage has become almost general in use, wings continue to be built of wood, wood and metal, and all metal, and in each class some are covered with cotton fabric and some with metal. The wing-covering department in a fac- tory using fabric wings offers a field for women. In the Ryan plant women are used exclusively for this work, for it has been found they do a better job than men. The cotton must be laid on smoothly and

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998 POPULAR MECHANICS ©P. & A. Putting the Finishing Touches on a Giant Air Liner to Sail.the England-to-India Route; Note the Special Baggage Compartment below the Central Engine Mounting under equal tension, so that, when the five coats of wing “dope” are applied, it will shrink to drumhead tightness in every part. Wing doping is a job for painters, but it takes several months for even an ex- perienced painter to become a good wing doper. The dope is a nitrocellulose prod- uct, closely allied to guncotton, and, un- der some conditions, equally dangerous while in the liquid state. For this reason the dope department is usually in a sep- arate fireproof building, and is watched with care. Building a ship, or rather, assembling one, for no airplane is completely built in its own factory, is a production-line job. The motors, instruments, and similar ac- cessories are purchased outside, and come ready for installation. Wood and metal for fuselage and wings, doors, windows and the cabin fittings and upholstery are the parts worked in the plant. While one department turns out the fuselage, an- other builds the wing, and the two then come together for assembly and covering. And after that the engine, motor, pro- peller, landing gear, stabilizer, rudder, tail fin, tail skid or wheel, and other parts, are added. RATS PROVE ACQUIRED TRAITS ARE OFTEN INHERITED A great and much debated question of evolution has been put to a practical test with twenty-three generations of rats. From observing the behavior of the rats in a tank of water, Prof. W. G. Mc- Dougall, of Duke University, has found that a trait acquired by one generation of animals appears to be transmitted to their descendants. Doctor McDougall placed the experimental rats in a tank with two gangways leading to dry land: One gang- plank was brilliantly lighted and was elec- trically wired so that the rat that chose it was sure to receive a slight electric _— a: ff Off on

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POPULAR MECHANICS shock, strong enough to be unpleasant. In such a situation, every rat learned sooner or later to avoid the lighted gang- way and to choose the less conspicuous path to shore. Rats whose an- cestors for many genera- tions were placed in the tank learned to take the shockless route after ex- periencing from three to seventy-five shocks, or an avérage of forty shocks, Dottor McDougall said. On the other hand, rats whose families had no such background of tank experiences, would take an average of 150 shocks, before they learned to solve the problem. HUMIDIFIER AND AIR CLEANER ONE UNIT Cleaning and moisten- ing the air passing through a hot-air furnace in a single operationis the purpose of a humidifier which also serves as a cold-air shoe to be at- tached at the air-intake point. The shoe contains a series of water pans, one inch deep and four inches wide, extending across the shoe and arranged one above the other so that dirt or dust passing by the first row will be caught in the next. Besides the series of staggered pans, there is a large pan at the bottom. All of the pans may be removed easily and all are filled simultaneously by pour- ing water into a funnel at the top, overflow tubes sending the wa- ter to each row of pans in suc- cession as the row above is filled. Sewer con- nections may be made to the bottom over- flow tube. Shanghai River Beggars Meeting Incoming Ships Use Nets on the Ends of Long Poles to Receive Alms RIVER BEGGARS COLLECT ALMS WITH BASKETS River beggars in Shanghai have found that it pays to meet incoming ships before they dock and solicit alms from the pas- sengers grouped along the rail. They run alongside the vessels, and extend bamboo poles with nets to receive the coins. PINK OYSTERS ARE WHOLESOME Pink oysters, after undergoing ten years of examination, have been given a clean bill of health by the state of New York. Chemists found the pink bivalves to be as wholesome as those of normal color, while previously, dealers often destroyed con- signments of pink oysters, believing them unfit for food.

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HE SIMPLE one-tube receiver de- scribed in the November issue was de- signed for beginners and was a complete receiver in itself; the layout, however, was planned so that either one or two a.f. amplification stages could be added with ease. No extra A or B-batteries are required for these audio stages, but there is an additional 4'4-volt C-battery in se- ries with the former C-battery for the purpose of biasing the grids of the tubes to be added. In the two-tube receiver shown in the first diagram and diagram -No. 1A, both C-bias values may be shifted to obtain best results. For example, 1%- volts C on the control grid of the screen- grid tube may give better results than 3 volts, and the 9 volts C on the grid of the first audio tube may not give as good re- sults as a lower value. Resistance-coupled audio amplification Adding the Second Audio Stage to the Screen-Grid Receiver 1000 Or is used to advantage with the screen-grid tube, all that is required in the way of additional apparatus for the first audio stage being a CX-299 tube, socket, 30-ohm rheostat, a double resistor mounting, two resistors of the gridleak or “cartridge” type, and a .0l-mfd. fixed condenser. ; The parts are mounted on the baseboard as shown in the simplified wiring diagram on page 1001 and in the photo at the upper right on page 1003. The positive A-battery lead for the 299 tube is taken from the set side of the filament switch, and the negative filament supply is taken directly from the negative post on the dry-cell A- battery and run through the 30-ohm rheo- stat. The 135-volt B-line is tapped for the plate resistor and goes to the point indicated as positive-B on the resistor mount. The line to the lower phone post is then connected to the P-post of the 299 tube. The .0l-mfd. fixed condenser is connected directly to the P and G-posts of the resistor stage. When all connec- tions to the tube socket and resistor stage are made as shown in the diagram, con- nect the flexible leads to the batteries and insert the 299 tube in its socket. The flexible leads, indicated as 1, 2 and 3 in the upper photo on page 1003, are the negative- A lead to the rheostat, and the two leads for the C- battery connections. The two-tube receiver is now ready for operation. Turn on the filament switch and then turn the rheostat knob to the right until a hissing sound is heard in the phones. The tuning is done exactly as described in the preceding article. The volume on local stations is suffi-

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cient to operate a loud speaker; for head- phones the volume may be reduced with the variable resistance in series with the antenna. To add the third tube, which is also a UX-299, no further apparatus except the tube, socket and resistor- The resistor-stage unit is tapped for the plate resistor, and the fila- ment connections to the last tube socket are merely extensions from the preceding tube, placing them in parallel where they are both controlled by the 30-ohm rheo- stat. The photo at the upper left on : P GROUND CLAMP stage unit are required. E ain ON WATER PIPE a duplicate of the first | ant| ono.[-a +A stage, and the connec- tions are clearly shown in the diagram on page sistor unit. Flexible leads 1, 2 and 3 are the same as before, and lead No. 4 is the 9-volt C-battery connection from the F- post on the second audio- stage resistor unit. The + B-BATTERY B- BATTERY 1002. The plate lead to | i Vu [Ds ~ é - +225 the lower speaker ter- oH fete wl SHS & *S ‘minal is cut as before THREE DRY CELLS J Co eg '.o AMPERITE. a i on 4 and moved up to P on 2 nt Po [| the last socket, and P of aera the preceding socket is : Ta connected to P on the re- PHONES \.0005 MFD, 135-volt B-line is again Simplified Wiring Diagram of the Two-Tube Screen-Grid Receiver 1001

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1002 Above, Three-Tube Receiver Assembly; Below, Schematic Diagram of the Three-Tube Set and Sim- plified Wiring Diagram this page shows the completed three-tube receiver ready for the batteries. The tubes always must be removed before the POPULAR MECHANICS DIAGRAM NO.I1 A batteries are connected, ) to prevent an accidental .0| C%299 «ok Ss CR 2899 short which would burn | rT them out. 3} } oe | The volume of the neal je f) three-tube set is suffi- np 2 =) LY cient to operate any type £ 2 { of loud speaker, and the + “al adi a cl -d +e SPEAKER— tone is all that could be GND. \-3y, 78 45v. S-4jv, 9V. 135v. DIAGRAM NO.2 A desired. With a good an- GROUND CLAMP ON WATER PIPE tenna and ground, dis- tant stations can be re- ceived with good volume, and an extremely wide range may be covered + "& B- BATTERY E mong +22% +45 +22% +4) 3 Bhs 3 : THREE DRY CELLS AMPERITE, 120 FLEXIBLE LEADS ~. ‘ ' ' .006 MFD. ox AI ? + ° .006 © ©} || mrp. ° 0 R , 8 -0005 MFD. aso | Ores. arr: +22% 232 9) C4 v. C-BATTERIES B-BATTERY } Le -@/ -4© fai Ana

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POPULAR with the headphones. Shift the C-bias voltages until the best results are ob- tained. Tuning is done as before; do not turn the condenser dial by jerks, but move it slowly and, when a station is picked up, adjust the volume control and the posi- tion of the variable primary coil until the station comes in loud and clear. These adjustments come with practice. The rheostat need be advanced only as the dry-cell A-batteries gradually drop off; never turn this rheostat higher than just necessary for- good reception. With ordinary use, the dry cells should last for several months, while the B-bat- teries will outlast several sets of A-bat- tery cells and will need replacing about twice a year. The three tubes require but Y% amp., and this drain on the dry cells is within practical limits for ordinary use. If, however, the filament switch is left on for long periods when the set is not in use, the dry cells will require frequent replacing. Those who desire may use a 4-volt storage battery and a B-eliminator with the set; standard 201-A, 5-volt tubes with a 6-volt storage battery may also be used, the screen-grid tube remaining as it is with the exception that a type 622 am- perite must be used instead of the type 120. The 30-ohm rheostat should be Radio Compass for Small Craft A recent demonstration in New York harbor of a newly designed radio compass for yachts and small craft showed its, efficiency in a unique test. A fog, seemingly made to order for the test, enveloped the har- bor. The earphones of the instrument MECHANICS Two-Tube Screen-Grid Receiver changed to a 20 or 25-ohm type for the larger tubes, or a type 1-A amperite may be used for each audio tube. If using larger tubes and a storage battery, the dry- cell space may be utilized to spread the baseboard layout in order to make room for a box shield for the coil. The completed receiver together with the dry cells and B-batteries in either the one, two or three-stage type may be in- stalled in a standard-size cabinet, as shown in the illustration at the left in the headpiece. Blueprint No. 148, for this set, price 25 cents, from the Radio Department. craft, the pilot held to his course for sev- eral miles through the fog, proving the dependability of this smaller type of ra- dio compass. Three radio beacons send their automatic sig- nals out over New York harbor and the water beyond for several hundred miles, just as other radio beacons pro- tect all leading har- bors all over the Boat Equipped with New Radio Com- pass, and the In- ventor, Doctor Kol- ster, Inspecting Installation were given to the pilot, and to be- doubly sure that he could not see, a handkerchief was tied over his eyes. With only the ra- dio signals to guide him while lookouts watched for other world. @To test speaker windings, connect the speaker tothe 110-volt ac. line, with a 10-watt car- bon lamp in series with the line, and listen for the hum.

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Az RIGHT WAY TO wi Ki { 4 DIRECTION | WASHERS? Fic.3 “LOCK NUTS WIRE END SHOUL SOLDERED LUG * PROVIDED AT END? 4 |g OF SOME CLIPS LOCK WASHER ye Fic.2 | ©} Ce —— Hien al LOCK WASHER SOLDERING LUGS BRIGHTEN ¥jan~~ BENT WIRE ov DOUBLE ! TYPES OF FAHNESTOCK TENSION MUST CLIPS CLOSE OPENING SINGLE \ & Fie.5 \ “ RUN ROUND FILE THROUGH HERE Good Connections Important _ Few radio fans or service men realize the important part binding posts or con- nector clips play in the proper working of a set. Improper installation and poor soldering of these parts will seriously affect reproduction. When servicing a set, the first thing to do, after the power system has been found faultless, is to see that the connections to the set are in perfect condition. Styles in binding posts are many, but their fundamental construction is similar to those shown in Figs. 1 and 2. In Fig. 1, the wire passes through a hole in the stud and a knob is screwed down upon it to hold it tight. The base piece is crimped underneath, which prevents its turning on the panel or binding-post strip. Suitable nuts and washers below the strip or panel hold the stud from turning. Other bind- ing posts of this type use a plain stud around which the wire is turned. The post shown in Fig. 2 employs a base piece in which is inserted a short stud on which the knob above is turned down. Under- neath, the base is tapped for a machine screw. When installing the type in Fig. 1, POPULAR MECHANICS it is necessary to use at least one lock washer, or soldering lug with lock washer incorporated, to prevent the nut below from turning out and allowing the post to turn. If no lug is used, use a lock washer and two nuts below to thoroughly lock the base in position, as in Fig. 3. A lock washer or lock-type lug should also be used in post Fig. 2. In either case, if the wire is turned about the lug or screw, place it between the top lock washer or lug and the bottom of the strip. In every instance when the wire is turned about the post, loop it, clockwise. For quick and efficient connections nothing is so popular as Fahnestock clips; when using these, file all points of contact as in Fig. 5. They come in several types, both single and double, as shown in the sketches at the right. After long use, if noises develop in a set, examine the points indicated at A, B, C, D and E shown in Fig. 4 to ascer- tain if corrosion has taken place. When building a new set, as an extra precaution it is well to disassemble all binding posts and brush them with alcohol or gasoline to remove any grease or lacquer before mounting them in the set. Soldering Iron Works like Fountain Pen A soldering iron of the electrically op- erated type which differs materially from the usual device is shown in the illustra- tion. Its distinguish- ing feature is that the solder is melted with- in the iron and flows to the point where it is controlled by a valve. This iron is made in three sizes and costs only a little more than the ordi- nary one. Light-Socket Antenna Kink To determine which of the two wires of the house wiring gives the best results for signal strength and. selectivity, tune in a distant station and reverse the plug in the socket. The best position being determined, mark both so that this posi- tion may be maintained.

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Humless A-Eliminator for Radio Receiver By MAXWELL P. GILLILAND HERE are two things every radio en- thusiast really desires: a perfect A- eliminator and the same kind of dynamic speaker. The A-power supply for the set enables the owner to operate his d.c. re- ceiver in connection with.a B-eliminator on the house-lighting circuit, retaining all the good characteristics of the tubes. This unit, being the hardest to get, is of course most desired. The average A-unit available today has a slight hum; though hardly noticeable, yet it is there. Respon- sibility for this defect is not directly trace- able to any one part of the assembly as it is usually caused by a combination of sev- eral conditions. As to the dynamic speaker, it is gener- ally conceded that the battery-operated type is best, in that there is no hum as with the a.c. types employing the usual rectifiers. The hum in some types is more pronounced than in others, but in all cases it occurs when the set is not tuned in ona station. The a.c. hum is kept at a mini- mum by the use of audio-frequency chokes designed to op- same notes. suppressive effect on the lower Many dynamic speakers employ a half-wave rectifier operating from a‘ small step-down transformer to supply the voice-coil current, and as there is no filter to smooth out the current ripple, the re- sult is the hum. The d.c. dynamic costs less than the a.c. type, and if a source of pure d.c. at ap- proximately 10 volts is available, both the receiver and speaker may be operated at minimum expense and maximum effi- ciency. Experimenting along this line led to the design and construction of the unit described and illustrated in this article, the result being an A-eliminator that fills the requirements without a hum. After many trials, the writer has found that the only satisfactory method of ob- taining pure d.c. for this purpose is to use tubes rectifying both halves of the 60- cycle a.c. supply. With large-capacity condensers and efficient choke coils, it is possible to maintain a constant potential and a very smooth current output. erate in the neighbor- hood of 50 cycles. Un- fortunately this has the RECEPT. FOR B-SUPPLY fier-Tube Assembly Upper Right, Schematic Diagram of Connections; Below, Clamp- ing Choke-Coil Assembly Together; Left, Transformer and Recti- 1005

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1006 POPULAR METHOD OF STACIXING LAMINATIONS Upper Left, Side View of Completed Unit; Right, De- tails of Panel and Platform Assembly The transformer that supplies the tun- gar rectifier tubes must be carefully and generously designed; suitable apparatus may be purchased, but the average ex- perimenter will prefer to make his own. A large amount of iron is necessary for the core; otherwise it will operate at too high a current density with little or no current regulation. Improperly gapped chokes saturate at very low current values. The chokes described have an in- ductance value of % henry and are spe- cially designed with heavy iron cores for use with the large-capacity filter con- densers. The transformer is of the closed- core type, the details of which are shown on this page... The over-all dimensions are 53% by 3% by 1% in., and the lamina- tions are cut and stacked in the manner shown. It will be noted in the diagram on page 1005 that there are four second- ary windings, the outer two of which sup- ply the filaments of the tungar rectifier tubes. The primary coil consists of 550 turns of No. 20 s.c.c. wire, layer-wound and placed on one leg of the transformer. It should be properly insulated from the iron core by means of “fish” paper or em- pire cloth, and wedged to the core so that no vibration will occur. MECHANICS Each of the filament secondaries con- sists of 11 turns of No. 12 d.c.c. wire and are placed on either side of the plate wind- ings on the other leg of the transformer. The coils supplying the higher plate po- ib THICK | TRANSFORMER ? | | : 7 f-—_—__—__— 5) —+ ~ TI eat re: Pate tential to the rectifiers have 125 turns of No. 16 d.c.c. wire. All of these coils are layer-wound and insulated carefully. The choke coil details are shown on page 1007; the cores are 2% by 3% by 1% in., and the air gap, as indicated in the diagram, approximates .015 of an inch. Fish paper of this thickness is recom- mended for spacers between the legs. The winding is placed on one leg only and consists of 390 turns of No. 16 enameled wire. The layout of the completed unit is clearly shown in the photos. It will be noted in the diagram that a receptacle has been provided for the B-supply, which is shunted across the primary winding so that both units may be operated by the same line switch. To wind all coils, prepare wooden man- A layer of drels the size of each leg.

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POPULAR heavy cord is first wound on the mandrel, as shown in the upper sketch on this page. Next, over this, is placed a layer of insu- lating cloth or fish paper, then the regular winding of wire. Over each layer of wire place another covering of paper or cloth, and be sure that the insulating material is held firmly in place. To remove the coil from the mandrel, unwind the layer of cord. The core laminations should’ be stacked until the specified thickness has been reached, after which the laminations are bound. together with a bit of tape. Over this, slip the finished coil, as shown in the sketch at_lower right on this page, and wedge the coil .into place. with small pieces of the insulating material. The other leg of the transformer is assem- bled in the same manner, and the two halves of the gore are then clamped by means of either wood, bakelite or metal strips, bolted ‘together at top and bottom. In the case’ of the chokes, no winding is placed on the second leg. Assemble the unit on a baseboard as shown in the photos; the two 2-amp. tun- gar tubes used are of the type usually em- ployed in battery chargers and fit into or- dinary screw-type porcelain sockets. The filter condensers are of the new 4,000-mfd. dry self-healing type, the ter- minals of which must be MECHANICS 1007 terminal is the red lead and the negative is black; these leads must not be reversed. After the current is passed through the filter system, the output is pure d.c. at ap- proximately 10 volts. This is carried di- rectly.to two heavy-duty pin..jacks and two binding posts, as shown in the dia- gram. In series with the positive post, is a 4-ohm rheostat with a current-carrying capacity of 5.amp., and an 0 to, 10-yolt d.c. voltmetér is conriected across the final output. The voltmeter is optional, but will be found very useful and, for best re- sult, should not be omitted. The pin jacks are for the field or “voice coil” of the dynamic speaker. Very even and mi- nute voltage adjustments may be obtained by means of the rheostat for the operation of practically any d.c. receiver. When, at the end of a year or so, the output of the tubes drops slightly, the rheostat may be set up a bit and things go on without fur- ther adjustment. The rheostat, voltmeter, A-power sup- ply posts and the pin jacks for the speaker field supply are mounted on a small bake- lite panel with angle-iron brackets. Blueprint No. 147, for this eliminator, 25 cents from the Radio Department. correctly connected for polarity. The positive Upper Right, Pointing Out Gap in Core of Choke-Coil Assembly; Below, Placing Coil on Core Leg (~~ @8 ©80808S808 +-- eeeeeeeeeeee ~-- eeeeeeeeeeee ~--\ Peeesepecseeees ' ! com TURNS? _ \ PAPER METHOD OF WINDING COILS 18 THICK

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ee Making a Midget’ Multimeter By WILLIAM H. WENSTROM at SHUNT \_"174-OHMS, 268 FT. OF *28 COPPER WIRE Fic.2 tained miniature flashlight battery, it makes continuity tests and functions as an approximate ohmmeter for measuring external resistances between 100 and 50,000 ohms, It will not, of course, make alternating current and radio-frequency measurements; for these; separate instru- ments are required. ‘ The following parts are needed for the instrument: 1 Weston, Model 506, mil- , liammeter, 0 to 5 mils.; 1 four-point in- ductance switch; 1 miniature single-pole, single-throw knife switch; 1 resistor, 2,000 ohms, of the gridleak size; 1 five-watt resis- tor, 100,000 ohms; 1 “>> CLIPS | 3-VOLT BATTERY HE ELECTRICAL or radio worker must have instruments for intelligent work; these instruments need not be ex- pensive and soon pay their way in check- ing ¢omplicated circuits where an error may easily result in serious damage to costly apparatus. In the midget multimeter described in this article, maximum usefulness has been combined with minimum size and cost, amounting to less than $10. All appara- tus is contained in a wooden case, the di- mensions of which are 2 by 3 by 5in. Yet it measures voltages through the ranges 0 to 10 and 0 to 500, and currents through the ranges 0 to 5 milliamp. and 0 to 250 milliamp. In addition, with its self-con- 1008 KNIFE SW. IND. SW. RANGE COR. FACTOR OPEN ' CONT.-RES. | SHORTILSMILS § OPEN 2 0-10 V. 1.00 OPEN 3 0-S00V. 1.05 OPEN ey 0-SM. 1.00 : CLOSED 4 0-250 M. 1.00 TABLE | - RANGES 4 three-volt flashlight battery and a small wooden case of the size shown, made from Y-in. white pine. The connections may be made with ordinary hookup wire, and two small bulldog clips are employed at the ends of the flexible test-terminal leads. The bottom of the case, detailed in Fig. 1, must be removable for battery replace- ment; the knife switch, milliammeter and inductance switch are mounted on a bake-

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POPULAR lite panel as shown in the photo. The shunt resistance consists of 32%2 in. of No. 28 silk-covered copper wire, which is wound on a wooden dowel, % by 2 in., the ends of the fine wire being soldered to the ends of the larger connecting wires, and thrust through small holes in the dowel. The resistances and shunt are soldered directly to the connecting wires, without mounting clips; the resistances are both wound with friction tape to cover all bare connections, as they must be crowded into the box. After all connections have been made, as shown in Figs. 2 and 2-A, the multi- meter is calibrated against larger standard instruments, preferably of the accurate laboratory type. Table 1 gives the various ranges and switch positions, and a like chart should be made up and glued to the side of the box. To calibrate the 0 to 10-volt scale, for instance, place the multimeter and a standard low-scale voltmeter across some given voltage, such as the filament of a tube which is in series with a battery and rheostat. If the standard voltmeter reads exactly 5 volts when the multimeter reads, say, 4.9 volts, a correction factor is neces- sary, and would, in this case, be 5 divided by 4.9 or 1.02. In other words, all multi- meter readings on the 0 to 10-volt scale must be multiplied by 1.02 to give a true reading. The 0 to 500-volt scale is cali- brated in exactly the same manner. In calibrating the current ranges, the multimeter is connected in series with a standard milliammeter and a suitable cur- rent source. No correction factor is needed for the 0 to 5-mil range, as the mil- liammeter itself is very accurate. On the 0 to 250-mil scale, if the correction factor is less than .95, take a turn or two off the shunt; if the factor is greater than 1.05, add a turn or two. For resistance measurements see table 2. The self-contained battery for conti- nuity tests and resistance measurements is connected in series with the milliammeter and the 2,000-ohm resistor; a direct short circuit of the multimeter terminals shows a current of 1.5 mils. With table 2 the multimeter can be used as an approximate ohmmeter, measuring external resistances between 100 and 50,000 ohms with an ac- curacy of about plus or minus 10 per cent. MECHANICS 1009 Of course, the battery must show very close to 1.5 mils on short circuit if this accuracy is to be maintained. Handling Charged Filter Condensers The high-voltage filter condenser is capable of holding a charge for a consid- erable length of time. Consequently shocks are possible if proper precautions are not taken when checking the modern power-supply unit. A simple method of avoiding such shocks is to make it a practice always to discharge such con- densers before handling them. This is done by merely shorting the condenser terminals with a piece of wire, a screw- driver, or any other metal conductor. Radio Set in Octagon Table Top The radio receiver shown in the illus- tration is a useful combination of a stand- ard octagon table and a set with dynamic speaker. The antenna, ground and power connections are concealed in the table legs; there is no exposed wiring above the floor, and the table is wired for a lamp connection. All parts and tubes are Hinged Top of Table Raised, Exposing Chassis of Receiver, and Home Installation easily accessible for servicing by simply raising the hinged top of the table.

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ek ™: Television Broadcasting in- England FFICIAL television broadcasting is about to begin in Great Britain, op- erated on the Baird system which recently came through exhaustive tests before the postmaster-general and a parliamentary committee. Mr. Baird’s results are said to.be all that the average man could de- sire, except, of course, the absence of color, and a size, which has the appear- ance of being about one-third that of life. The drawing on the opposite page fea- tures the scanning disk or “reproducing wheel” in particular, and the upper left units A, B, C and D show how the spots of light passing the spiral of holes com- pletely traverse the subject. These sketches incidentally show the famous to- bacco-smoke test, the graduations being transmitted with exceptional clearness. The transmitting end of the apparatus is diagrammed below and the receiving televisor at the upper right in the full- page illustration. Certain secret details recently developed by Mr. Baird are not brought out in the illustrations; for ex- ample, there is a double spiral of scarcely discernible holes in some of the disks em- ployed, and a really efficient synchroniz- ing gear is now operated at the hub of the scanning disk. Some remarkable effects are produced by this television apparatus, as shown in the various sketches. When adjustments prior to transmission are taking place, ef- fects known as “rain” or “confetti” may be seen in the televisor similar to those shown in Figs. 1 and 2. In the latter the image may be almost blotted out by a shower of spots of light. The subject, seated before the photo-electric cells at the transmitter in the lower illustration, experiences a dazzling sensation as the swiftly moving pencils of light traverse her face. The reflected light is converted into like current fluctuations by the pho- to-electric cells and broadcast as such, in the same manner as voice and music are handled by a microphone, and the sound Left, Complete Television Receiver Soon to Be Seen in English Homes; Right, Rear View Showing Repro- ducing Wheel, Motor and Synchronizer 1010 is transmitted as electrical impulses of corresponding fluctuations. This “televisor” is the commercial in- stallation that will shortly be seen in many English homes. Housed in a neat console, the apparatus consists of a suit- able radio set, speaker for vocal announce- ments and regular broadcast programs as well as the equipment for picture recep- tion. The images are viewed through the lens shown at the right, and the speaker grill is located at the left.

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POPULAR MECHANICS Copyright, 8. W. Clatworthy Upper Right, Sectional Diagram Showing Television Receiver in Operation; the Observer Views the Image through the Lens at Right; Below, Transmitter, Showing Pencils of Light Traversing the Subject Trans- mitted to the Receiver Above

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1012 POPULAR MECHANICS Receiver Employs Five Screen-Grid Tubes The ten-tube receiver shown in the up- per photo is a powerful custom-built as- of which is exceptionally great. This tube is especially adapted to the intermediate- frequency stages of the superheterodyne receiver. Since they operate at only one frequency in this circuit, all tendency toward os- cillation is eliminated. One of these tubes is the detector upon the plate of which is impressed 175 volts. This new system of power screen-grid de- tection prevents over- loading the detector, even at maximum. A plug-in Upper Left, Receiver Ready for Installation, Showing Compact Assembly; Below, Power Unit sembly, employing five type-224, three type-227 and two type-245 tubes. The power unit below is a specially designed instrument, the filter system of which is equipped with a heavy choke and the new self-healing condensers of 24-mfd. capac- ity. An automatic line ballast and reg- ulator levels out all fluctuations in line voltage from 95 to 130 volts. This line regulator may be switched out if not re- quired; a type-280 rectifier tube is em- ployed in the power unit. The receiver is very compact and is designed to fit cur- rent models of fine consoles. The ampli- fication system is built around the new a.c. screen-grid tubes, the amplification factor Bringing Out the Bass Notes The diagram shows a simple and effec- tive method of bringing out the bass notes that add so much to the quality of any program. The “darkening” condensers placed across the secondaries of the a.f. transformers may be any good fixed type, and have the effect of lowering the fre- quency of the coils to favor the low-fre- quency bass notes. As it is advisable to try a number of different capacities, condenser mount- ing brackets should be provided to make *OARKENING PRL SEC. CONDENSERS, jack is provided for the instant attach- ment of an electric phonograph pick-up system. The entire audio system is used for this purpose. Good selectivity and coast-to-coast range combined with hum- less a.c. operation are claimed for this new receiver. possible quick change of values. Trans- former characteristics vary considerably and hence no set values can be given, but the proper capacities will be somewhere between .0005 and .006 mfd. Cleaning Tip of Soldering Iron Good work cannot be done with a sol- dering iron that is not kept clean and well tinned. A small wire brush is useful for cleaning the tip of the iron before tinning. A woolen cloth or asbestos pad should be used to keep the point clean. @Popular Mechanics radio department offers its information service free to all readers of our magazine.

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Plug-In Coils Wound on Tube Bases The use of plug-in coils, especially with short-wave receivers, is increasing. Many experimenters would like to make their own, but are deterred by lack of the necessary construction details. This article illustrates and describes a simple and inexpensive method of wind- ing coils of this type, employing the bases of old tubes for the necessary plug-in forms. Choose tubes having bases as long as possible. Old rectifying tubes and power tubes have longer bases than ordinary receiving tubes, and burned-out tubes of this type may often be obtained from the local service man or dealer. The tube may be removed from the base either by painting the cemented joint with alco- hol or by immersing the base in warm water until the tube is loosened. When employing the latter method, be careful that the water is not too hot or the base will be damaged. When the tube is loose, POPULAR MECHANICS 1013 for winding all coils down to those for the 20-meter band. As the higher frequen- cies are approached, however, better re- sults are obtained by using d.c.c. wire of a larger diameter, such as No. 22. For the tickler coil, a bared end of wire is inserted in the bottom hole in the tube base, passed down through the prong and bent over as shown. The end of the wire is fastened in place with a drop of solder, which is then filed down in the same man- ner as on the tube. The tickler coil is now wound tightly and clamped to the base, and the upper end of the bared wire passed through the second hole and prong and served as before. The primary wind- ing is done in the same manner. It will be noted that the two large prongs are always used for the tickler leads and the slender ones for the primary leads. When connected in this manner, the coils will all be alike and work satisfactorily in sockets where like connections are made. When complete, file away all excess solder and brighten the prongs to make good heat the ends of the prongs with a soldering iron, and the tube and leads may then be lifted clear. Turn the tube base over and drill out the prongs tor a clear pe passage. The four small holes for the tickler and OARETE SHELL primary windings are then drilled in the side Pry A. £ Hh of the base, as shown | in the construction dia- gram. The writer uses No. 28 enameled wire CONSTRUCTION OF L HOLES FOR TICKLER WINDING LEAD WIRES CAN BE REMOVED BY MELTING SOLDER § IN ENDS OF PRONGS' #20 DRILL TUBE SEPARATED FROM BASE By SOFTENING CEMENT HERE WITH ALCOHOL HOLES FOR PRIMARY WINDING WOUND IN SAME DIRECTION LEADS FROM 4 ELEMENTS TO RONGS LEADS FROM COILS TO Fh “ LEAD BENT - | PRONGS OVER AND (| SOLDERED j; Above, Detailed Construction Diagram; Left, Painting Tube Joint with Alcohol to Loosen Cement; Completed Coils Ready for Lifting Handles IFTING HANDLE COMPLETED FOR COILS SMALL HOLES’ “ LARGE HOLES COIL contact in the socket. Two holes are then drilled in the top of each coil form to take short 6-32 machine screws for the lifting handles. These handles may be made from strips of fiber, drilled and bent to form bails as shown, and are held by the machine screws and small hexagon nuts on the inside of the form. A table of turns for the various wavelengths is 1013

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i : nad SE COS 1014 POPULAR rather difficult-to give, owing to varying condenser capacities émployed in differ-

Soldering the Projecting Leads to the Prong Tips ent circuits. With a five-plate wave- length condenser and one of eleven plates for regeneration, the writer employs coils of the following turns with good results: For the 15)-meter band, tickler, 42 turns and secondary, 18 turns; for 80 meters, tickler, 22 turns, secondary 12 turns; for 40 meters, tickler, 9 turns, secondary, 10 ‘turns. For the 20-meter band use No. 22 d.c.c. wire, employing 7 turns on the tickler coil and 4 turns on the secondary coil. For the 10-meter band use 5 turns of the same size wire for the tickler and 3 turns for the secondary. These coils

MECHANICS trouble. In many instances, the loss in sensitivity may be traced to changed re- sistance values, usually upward rather than downward. Since the sensitivity of the circuit depends upon constant and definite resistance values, the answer, of course, is new resistors. New Television Scanner Employs Shutter A combination scanning drum and se- lector shutter has recently been demon- strated by the Jenkins Television cor- poration engineers. The new arrangement takes the place of the former scanning drum with the light-conducting rods and four-plate neon glow lamp. It is claimed to be more efficient and to give better de- tail and illumination than the former de- vice. Silhouette transmissions appear with sharp black-and-pink definition, and half- tone pictures are also handled with good results. The use of the selector shutter in combination with a standard neon tube and a small scanning drum, so that the drum rotates four times in flashing each 48-line picture, results in retaining the compact dimensions formerly obtained, yet the equipment is reduced to the sim- plest and most economical terms. Emergency Clips for Screen-Grid Tubes Experimenters with screen-grid tubes will often find themselves in need of clips for the control-

overlapping above and below to cover cover each band, : _ |caP the entire short pw wave range. cr. wo USING A oi FAHNESTOCK Regaining Lost cLIP Sensitivity cur out OF THIN BRASS, Many old sets are discarded be- cause of lost sensi- tivity, and when the set begins to lose its ability to bring in the distant stations, the owner

, SOCKET TUBE stations, aT usually buys new OLD GRIDLEAK TIP USING OLD TUBE AND tubes and batteries, ‘sre, <frey | a va HALF OF BUTTON SOLDERED TO FLEXIBLE LEAD HALF OF BUTTON SOLDERED TO CAP,

grid cap. Six emergency clips for the tube caps are shown in the sketches and have been found to meet the requirements. The materials are to be found around any experimenter’s work table and the GOOD CONTACT cost is practically ————) sething The .al- ways adaptable Fahnestock clips, snap cuff buttons, small spring clips and ends of grid-

which may or may not remedy the Various Ways of Making Clips for Control-Grid Caps from Odds and Ends leaks, also are good material for clips.

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Easy Chemical Tricks By SAM BROWN AGIC has many divisions. That sec- tion dealing with tricks based on chemical reactions contains a wide va- riety of novel and excellent effects, and Above, the Mysterious Sugar Cube Bobs to the Surface; Right, Parlor Fireworks from an Orange Rind and a Candle the little preparation necessary for the presentation of these mys- teries is well worth while. First, “The Ghost Sugar.” In this effect, the performer drops a lump of sugar into his coffee. It sinks to the bottom of the cup immediately, and in a manner thoroughly unmagical. But, wait! Presently the sugar bobs up on the surface, where it floats around buoyantly and smiles sarcastically at an amazed audience. The chemical agent in this effect is that simple preparation called collodion. The sugar is previously dipped into this solu- tion. This must be done rapidly, and the sugar should be held there for only an in- stant. After the dip- ping, the sugar should be allowed to dry for about 24 hours. The prepared lump, when dropped into the coffee, will sink in- stantly, but, as the sugar dissolves rapidly, the 1015

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1016 POPULAR framework of collodion will presently bob up on the surface of the coffee. I might say, in passing, that the collodion lump should not be left about, for its appear- ance is quite like any other lump of sugar, and someone might—oh, well! Why wait for the “grand and glorious Fourth” to have fireworks? If you will take a thick orange peel and squeeze the juice from it into a candle flame, you will witness a pyrotechnic display of golden stars which is entirely out of proportion - to anything so plebian as “just a rind.” In the next effect, the performer ex- hibits an ordinary moth ball. He drops the ball into a glass of water. It sinks. Then, on command of the performer, the moth ball rises to the surface of the water. The Obedient Moth Ball Obeys Its Master’s Voice; Lighting a Candle from a Glass of Water; Right, It’s Easy to Ignite Sugar MECHANICS On a further command it goes to the bot- tom again, then, finally, to the top, when it is removed by the magician and passed for inspection. Really, there’s nothing to it. The moth ball is simply a moth ball; the water is carbonated water procured from the cor- ner drug store. When the moth ball is dropped into the water, it naturally sinks to the bottom. At the bottom of the glass, however, it breathes gas from the carbon- ated water, and presently becomes light enough to bob its way to the surface, only to sink again as the gas escapes. The ma- gician need only time his commands to synchronize with the chemical reaction— and there you are! Did you ever happen to hear the story about the girl and the magic can- die? Well, anyhow, the candle went out, and left the girl in fear- some darkness. “Oh, dear me,” she wailed, “what'll I do?” And then she remembered a fairy story, and, touching the candle wick to the edge of a glass of water she was carrying to her sick grand- mother, she received her flame back again! No fooling! That last is the “patter”; the ac- tual trick is done with a small piece of phosphorus about the size of a pinhead. This is stuck to the rim of the glass with a minute piece of tallow. When the hot wick of the candle touches the phosphorus, it

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POPULAR MECHANICS ignites immediately and lights the candle. At the instant of light- ing, the tumbler should be tilted so that the candle appears to be relighted from contact with the water. Phosphorus, by the way, should be kept moist when not in use, as it ignites with extraordi- nary quickness at a comparatively low temperature. The average person imagines that lump sugar being almost pure Top, Right, Making a Soap Bubble Go Boom and “Faw Down”; Below, If You Have No Matches, Be Non- chalant, Light the “Cig” with a Piece of Ice carbon, will burn readily, but, fact is, it does nothing of the kind; it merely melts away when a lighted match is held under it. Of course, if you are a magician—well, you know how clever some people really are! The secret is simple. The sugar must be previously casually rubbed into some cigaret ash, and the ash, adhering to the lump, will give it sufficient “timber” to burn readily. Did you ever hear a soap-bubble go “bang”? Go on! How could the gossa- mer sheen of a soap bubble go bang? Well, here’s the how. Take a bubble pipe and wad a small sponge soaked with gaso- line inside it. Fumes from the gasoline will be largely the contents of the bubble; and when held near a candle flame, these bubbles will explode with a quaint bang which is quite mystifying. In the next number, the performer dem- onstrates just how convenient it is to be possessed of the magical touch. With no matches available, the magician lights his cigaret from a piece of ice which he has removed from the iced tea. How’s that for service? Of course, no one is supposed to know that his cigaret has been previously treated, and that a small bit of potassium has been inserted in one end, as shown in the sketch. When the potassium comes in contact with the wet ice, it instantly ignites, and lights the cigaret. Must I say it? Be sure you know which end of the cigaret is which, before you proceed with the nonchalant gesture. @When a copper-lined or porcelain tank for cold water leaks from small holes, dry off the surface thoroughly with a rag; then locate the leak, and pour hot paraffin or drop wax from a candle on it. - ; aa 5 5 : + - - : * _ — EEE RET EP BSNEB OME! KT Bee

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1018 POPULAR MECHANICS Tractor Used as Locomotive Equipped with four large flange wheels to fit regular railroad tracks, an ordinary Gasoline Tractor, Equipped with om Wheels to Fit Railroad Track, Serves as Locomotive for Hauling Cars of Dirt and Stone gasoline tractor was transformed into a small locomotive and was found highly satisfactory for hauling cars of earth and rocks. As a tractor usually has only two drivewheels, side rods are used to provide all the wheels with equal tractive power. A pipe frame covered with canvas pro- tects the driver or engineer from the weather.—Carlton Groat, Portland, Oreg. A Green Lawn without Grass From a distance, the front yard shown in the photo looks like any other well-kept lawn with grass, flowers and shrubs, and only a close view shows that the lawn is in reality rough cement painted green. Ce- ment is used instead of sod for reasons of economy, as the cost of water for irriga- tion in this locality is too expensive — George B. Bowers, San Diego, Calif. Eradicating Poison Ivy Poison ivy can be eradicated by spray- ing with low-grade kerosene, which suf- focates the cells in the plant tissue and causes destructive chemical action. Higher grades of kerosene are not so effective for the purpose as they are too volatile. The treatment preferably should be applied in hot weather when the soil and air are dry. Crude oil will serve equally well. Re- peated cutting of the plant close to the ground facilitates destruction through starvation. The cutting causes the plant to use up all the food stored in its =| roots and, due to the withering of the foliage, it cannot provide new food for regrowth. Insulating an Electric Extension Cord Dangerous electric shocks are often occasioned by handling ex- tension cords in basements. To prevent this, the metal sockets are sometimes covered with friction tape. It is necessary, however, to continue the wrapping of tape on the cord, especially near the socket and plug ends, where the California Home Owner Has Green-Painted Concrete Lawn Re- sembling Grass wire is likely to wear quickly, ow- ing to constant bending and

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POPULAR MECHANICS strain. A better method of insulating the extension cord is to get a piece of rubber tubing of the same length as the cord and slip it over the latter. Use a rubber plug and an insulated socket and then bind the ends of the tubing to the plug and socket with friction tape, in order to prevent the entrance of water. A cord covered in this way is easy to handle, will not kink and is safe to use anywhere, even in a flooded cellar. Brads Steady Small Pictures Wall pictures, especially small ones, often hang crooked, not because they were hung so in the first place but because of vibration of the building. To eliminate the necessity of daily readjustment of the pictures, drive a small brad into each of the two lower corners of the frame, on the back. The heads are then cut off with a pair of wire cutters, leaving a sharp point. The brads should not project more than % in., and the points can readily be pressed into the surface of the wall so as to hold the picture level.—Douglas Leech- man, Ottawa, Can. Anti-Rattler for Front Auto Fender You can prevent the front fenders of certain types of small cars from rat- tling by in- stalling two small pieces of strap iron as shown in the drawing. The strap iron should be about ‘se in. thick and the pieces about 3% in. long. They are bent at right an- gles, and a hole is drilled at the outer end, to fit on a lug of the lamp bracket. The installation shown was made on a Chev- rolet of the 490-type. Before drilling the holes, place the pieces beside the radiator shell so that they will spring tightly against it after they have been attached to the lamp-bracket lug—Guy E. Clark, Everett, Wash. STRAP-IRON BRACE ) ! IRON ROD } RADIATOR —7 TOP VIEW Old Bathtub Sunk into the Earth Makes a Good Fish Pond Old Bathtub Makes Fish Pond The photo shows a practical fish pond which consists merely of an old bathtub sunk into the earth. It is the idea of Loren Grey, twelve-year-old son of Zane Grey, American novelist and sportsman. A 4-in. layer of sand was spread over the bottom and suitable water plants were added to make the pool attractive. Fingerprint as Check Protector Fingerprints make excellent check pro- tectors. Merely press your thumb on a stamp pad and make an impression over the figures denoting the amount of the check, as shown in the drawing. It will be very difficult for anyone to change the figures without any trace of the attempt, Those who do not feel justi- fied in pur- chasing a me- chanical check protector will findthis method very satisfac- tory, and the expense is negligible.

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7 CEILING ~ HE ANNUAL dressing up of the Christmas tree can either be a medi- ocre job or a work of art. During the holiday season you see hundreds of trees posed in the front windows of residences. Many you pass by without a second look. They are mere commonplace Christmas trees, loaded with tinsel and gaudy bau- bles. Other trees compel attention. They fascinate the eye. It is not the tinsel and baubles and glamour that hold the atten- tion, but the symmetry, the color harmony and the background. To decorate a tree, the first requisite, of course, is the tree itself. Sometimes it is difficult to obtain a perfectly symmetrical tree of the size you require. The tree may be ragged on one side, or the layers of branches may be too far apart. But by 1020 Jerseing Up the CNB) Dick Tole applying a little ingenuity you can shape almost any tree into a perfect cone. To do this some extra branches are neces- sary. If these cannot be obtained, it is well to buy a second cheap, misshaped tree, and use its branches for making one good tree. Wherever the branches of the tree are sparse, extra branches are used to fill in. One of these is cut to suitable length and the bark peeled off the thick end for about lin. A hole the size of the peeled branch is bored in the trunk of the tree and the branch is inserted. It should fit tightly, but glue is not necessary. Of course, care should be taken when boring the hole so the branch will fill in where needed. Fig. 1 shows how this “grafting” opera- tion is done. Often the lower branches of a Christ- mas tree droop. This irregularity is rem- edied by holding up the drooping branches with lengths of fine wire or thread at- tached to the middle of the branches and to a higher point on the trunk. Fine en- ameled wire is almost invisible when used for this purpose, although several lengths of dark-green silk thread will serve. After the tree has been shaped, the next operation is to set it up. There are many patent stands for Christmas trees, but un- less they have a very wide base or are screwed to the floor, the tree can easily be tipped over. Where there are little chil- dren in the home, their curious fingers are bound to reach for the glistening or- naments, and an upset tree is a common consequence, sometimes with disastrous results. This danger can be avoided by suspending the tree as is shown in Fig. 3. A long, slender screweye is driven into an overhead rafter. Ifa small drill is used to pierce the plaster, no disfiguring mark will be left when the screweye is removed. A length of fine piano wire is attached to the screweye and led down the trunk of the tree with a series of half hitches, This

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ad rk d. to of method offers another very good feature, namely, means of water- ing the tree. Every one knows that, in a heated house, a Christ- mas tree soon dries out and the needles fall. But if the base of the tree is submerged in water, the tree will live for months, and with the tree suspended, it is a simple matter to place a crock or jar under its base. Rather than filling the crock with water, which might be slopped over, it is better to pack the space around the base with sawdust or sand and keep it wet. It is also well to bore a few radial holes in the base so that water can reach the heart of the trunk, as in Fig. 2. You are now ready to string up the lights. These are the bugaboo of many Christmas-tree decorators. It is quite troublesome to locate a burnt-out lamp because the bulbs are wired in series, that is, the current passes out of one light into the next throughout the string. If any one lamp burns out it opens the circuit on all the others. Each lamp must then be tested separately to locate the bad one, which often means getting out the stepladder and disturbing the fragile ornaments. This trouble can be eliminated. It is customary to use two, three, four or more strings of lights on a tree, and by rewiring these into a system called “series-parallel,” a warning is immediately given if a lamp burns out, and the bad lamp can instantly be located and replaced. figs. 4 and 5 explain this method of wiring. First one must prepare the leads to the lamp sockets. These vary in length to conform to the conical shape of the tree, the longer leads being at the bottom. In the case of rewiring four strings of lights, prepare four sockets with 8-in. leads; four each with 12, 16, 20-in. leads, and so on up to 36 in. Additional wire will be necessary, and a good, well-insulated kind should be used. AR gee WE 2 eae Pi ie c : >— After the eight sets of sockets and leads are ready, cut off eight l-in. lengths Fia.4 of %-in. fiber tubing. Drill two sets of fiber tubing and are twisted together. four holes in each piece as shown in Fig. 5. The leads to each socket of a set are drawn into these holes—one wire in the top hole, the other wire in the correspond- ing bottom hole. The wires are then poked out through the nearest end of the When the eight groups have been pre- pared, they are joined with 12-in. lengths of ordinary insulated wire. The connec- tions should be soldered, taped, and then forced back into the tubing to make a good-looking job. 1021 = oc PR OTE OM LEIS

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1022 In use, the main feeder is stretched along the trunk of the tree with an occa- sional wind around it. The leads to the lamps can be twisted around the stems of the branches so as to be almost invisi- ble. With the ordinary Christmas-tree lights, the wire must be draped from branch to branch in an unsightly manner. After the strings of lights have been wired into series-parallel, if one lamp burns out, the other three of the group will brighten up considerably, while the remainder of the lights on the tree grow dim. The fourth lamp of the bright group is, of course, instantly rec- ognized as the bad lamp. The series-parallel wiring should not be applied to less than three strings of lights. Four strings are better. Even though this rewiring may take a little time and money, the result obtained is well worth it. When the tree is finally taken down, the string of lights can be stored away and used year after year. The first cost is the only one. _ After the lights have been installed on the tree, there are many ways of proceed- ing with the decorating. LEADS TO LAMPS. VARY The common way is to wena -C te drape the tree with tinsel cord, and to hang shiny, colored orna- ments here, there and everywhere. Per- haps “barber-pole” candy canes and over- stuffed netting stockings add to the mis- cellaneous decorations. The result is just an ordinary Christmas tree like thousands of others. But a tree decorated accord- ing to the following directions will be dif- ferent. It will be one of those exceptional trees which commands the attention of the passer-by. Just as it will be pleasing to those without, so it will be pleasing to those within. The first operation is to spray the whole tree with thin varnish. Any varnish thinned down with turpentine will do. A “fly-tox” sprayer will also serve as a var- nish sprayer. During the spraying, it is well to surround the tree with an old bed- sheet or with sheets of wrapping paper, so that the varnish mist will be confined SIX MORE } GROUPS co. POPULAR MECHANICS and will not settle on the furniture and drapery of the room. After the branches have been thor- oughly sprayed, cornstarch is sprinkled over the tree. The best way is to use a flour sieve above the topmost branch, and allow the starch to settle softly on the upper side of the branches. During this operation there should be no _ draft through the room. After a few minutes, the tree is again sprayed and again “starched.” These operations are re- peated until a sufficient bank of “snow” has been built up on the branches. Then, after a final spraying with varnish, flake mica is sprin- kled over the tree. The flour sieve cannot be used for this purpose. The mica must be sprinkled gently from the hand. So-called “imitation snow” is flake mica. Some of the powders used in tire casings are finely crushed mica and can be used. Of course, it must be the glit- tering kind. The lamps should be in the sockets during the var- nish spraying, and immedi- ately afterward be wiped off with a rag dipped in turpen- tine. If the sockets are left open during the spraying, varnish may enter and will act like glue when the lamp is screwed in. Tinfoil “icicles” add a pleasing effect to any tree and should be used freely. These should always hang straight; never be draped from branch to branch. If the narrow strips of foil are twisted, a better effect will be obtained from indirect light- ing. A reasonable number of spherical ornaments are now hung from the branches and spaced symmetrically about the tree. Use mostly colorless ornaments with a mirror surface. Ample color will be provided by the color scheme to be described later. If vou can obtain some glass prisms such as were used on the old- time lamp in the parlor in pre-electric days, they can be used to good advantage on a Christmas tree. With indirect light- TO THIS ' FROM s'at) ing, the prisms reflect all the colors of the spectrum. All of the foregoing decorating sugges-

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POPULAR rect lighting is very easy to install. light fall upon the tree at an acute angle. Y%e or \Y-in. rod, about 3 in. long, is threaded at one end and fastened to the center of the removable lid with two nuts. The other end is tapered off to a sharp point to act as a pivot point for the re- volving color screen. As many holes as possible should be cut in the top and bot- tom of the can to allow free circulation of air. Make a very small slot in the side of the can first, then, after the fixture is in place, enlarge the slot until the beam just floods the tree. A cone is made from ordinary tin. The face of this is slotted, and sections are bent up to form fan blades. A cylinder of colored celluloid is suspended from the rim of the cone. It is best to use the pri- mary colors—red, yellow and blue. Note that the color bands are in a spiral around the cylinder. This gives the effect of the changing colors settling down on the tree instead of flashing on it. It takes from five to ten minutes for the lamp to become hot enough to establish air circulation through the can. The flow of hot air is very trifling, in any case, so the pivot point must be made as sharp and frictionless as possible. ‘ Since there is no synchronization of the color screens, they will not revolve at ex- actly the same speed. Thus the blending of the primary colors will produce nearly every tint of the color scale. The effect is fascinating. Particularly the violet tint on the imitation snow. In rural districts where electric light is not available, revolving color screens can be used with gasoline lanterns. The mica chimney is replaced with a slotted sheet- metal cylinder. The dome top is removed to give better air circulation. It is also necessary to remove the handle. See Fig. 8. As celluloid is highly inflammable and a gasoline lantern gets rather hot, it is best to leave a space of at least two inches be- tween the celluloid and the metal sleeve. MECHANICS tions have been made with a view to enhancing the beauty of the tree with indirect lighting, as well as with the string of lights. With the string of lights alone, the tree is exceptional ; with indirect lighting and color screens, it is spectacular. See Figs. 6 and 7. A 100 or 150-watt lamp is fitted within a sheet-metal shield with one narrow opening, and a color screen revolves around it. of these fixtures are used and are placed so that the beams of Any large can with a removable lid will serve as a shield for the lamp. A piece of Indi- Two 1@ ¥ pivot/ P& OPENING POINT | FOR LIGHT BEAM —— ae “ HOLES MADE IN BOTH | ENDS TO PERMIT 7 DOME TOP REMOVED FROM LANTERN HOMEMADE LIGHT FLASHER

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1024 POPULAR MECHANICS Colored celluloid may be difficult to ac- quire in rural districts. But old 8 by 10- in. negative films can be procured from the town photographer. The emulsion can be washed off and the film colored. Common glue, thinned out with hot water and colored with red, green or blue ink, will make a very good temporary color film on the celluloid. It will pass much more light than the so-called “color var- nishes.” A homemade thermostatic flasher for a string of lights can easily be made, as is illustrated in Fig. 9. The drawing ex- plains the operation. It might be well to mention that fine iron wife can be used in place of nichrome wire, and ordinary iron or brass screws instead of the contact adjusting screws from a distributor. How- ever, the use of the former makes frequent adjusting necessary, as the soft points burn away when the contact is broken. The operation of the flasher should be ob- vious. When the screws are in contact, the current passes through the resistance wire wrapped around the ring. As the ring heats, the aluminum band expands more than the steel and the contact is broken. The wire then cools down, and the contact is re-established. Rubber Band for Model Airplanes Often the maker of a model airplane wishes to try out his plane but has no rub- ber band on hand — for the purpose. Get a few large rubber bands at a drug store and cut them as shown in the drawing. By this method you can get a band 30 in. long, and any num- ber of these can be tied together.—Asa Arent, Humboldt, Iowa. Cement for Celluloid Rims Celluloid rims of eyeglasses can be re- paired by acetic acid or acetone, which is obtainable at any drug store. The acid is applied to the broken ends, and they are then held together tightly for several minutes until the cement has dried. The » » Bo fo 2 Oo &

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acid softens the celluloid, which makes it more or less sticky, and if the pieces of celluloid are pressed together while in this condition, the joint will be nearly as strong as an unbroken piece of the mate- rial. When repairing rims in this way care must be taken to set the lens at the correct position in the rim. However, this repair should be attempted only in case you are sure the glasses are used for correcting simple near or far-sightedness without astigmatism.—Jesse T. Simmons, Salt Lake City, Utah. Winter Protection for Bush Fruits Covering the tips of black raspberries with dirt to protect them-during the win- ter can be done conveniently and quickly in the following way: Pin the bushes down against the ground with a pitchfork, placing the fork about halfway to the top of the bush. While they are held in this position, throw a few shovelfuls of dirt on the tips to hold them down. The bent bushes catch the winter’s snow and this protects them against the weather.—C. Bernard Peterson, Buffalo, N. Y. Cable Replaces Noisy Brake Rods Rigid brake rods often rattle annoyingly and many of the older cars have an offset bend which tends to straighten out when Substituting Steel Cable for Rigid Brake Rods Elimi- nates Rattle and Gives More Positive Brake Control pulled, making it difficult to get a smooth and effective brake grip. These objec- tions can be overcome by using stranded steel cable. Such a substitution can be made by any car owner. The method of clamping the cable to the brake connec- tions is shown in the illustration. POPULAR MECHANICS 4 Window Shelf over Table in the Breakfast Nook Provides Additional Space Shelf for the Breakfast Nook An auxiliary shelf will be found a great convenience in the breakfast nook for holding the sugar bowl, salt and pepper shakers and other table accessories, which must be removed from the table when the cloth is changed. Besides, the shelf pro- vides additional space when the table is crowded. It consists merely of a 1-in. board of suitable length, finished nicely to match the woodwork, and supported on angle brackets as indicated.—Hi Sibley, Pasadena, Calif. Lace Curtains Used for Stencils Wide-mesh lace curtains can be used for stenciling wall panels. The curtain is first cut to the desired size and is tacked over a light wooden frame after which it is given one or more coats of thin shellac to stiffen it. Too much shellac should not be used if there are any small open- ings in the curtain design. The purpose of stiffening the fabric in this way is to prevent it from pulling out of shape when used. The stenciling is done in the usual manner by means of a stippling brush. It is advisable, in taking up this idea, to ex- periment a little in order to get the paint of the proper consistency. If it is desired to use one stencil for a number of panels of different size, mount it on two round sticks from which as much or as little can be unrolled as required to fill the space.— J. S. Hagans, Chicago. errereurbtse se =» — APN tee te et eg Ale a me ANT oe

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= vor bon atime are} Car eho b View of the Ford Tri-Motor % Scale-Model Plane, Mounted ‘ as Though in Flight; Note i the Realistic Appearance of the Ship as Compared with the Full-Size Plane on the Opposite Page By WALTER BULLOCK Pilot, Northwest Airways, Inc. HE BIG all-metal tri-motored Ford air liner, with its silvery corrugated dura- lumin covering, its three big Wasp en- gines and shining steel propellers, makes one of the best of all planes for the ex- hibition-model builder to copy, for a well- .made scale model is not only beautiful, but represents hours of careful and inter- esting work. This is the story of how to build an ex- act model on a scale of “ein. to 1 ft. This scale gives a wing- spread of 24%e in. and a length over all, from the boss of the propeller hub to the tip of the tail, of 15% in. That’s just a nice size to hang from the chan- delier, place on the bookcase or man- tel, or, possibly, sell or rent to a mer- chant who wants an unusual window display. Because duralu- min cannot be sol- dered, we will build our model of thin sheet brass, nickel- plated, on a fuselage and wing made of wood. The brass used is .008 in. thick, 1026 and can be obtained already corrugated and nickelplated. To build the model, you will need, besides the usual saws, planes; hammer, and other common cCar- pentry tools, a draw or spokeshave, to carve out the wing, soldering iron, small nose pliers, tinners’ snips, and a supply of small round-head brads in % and %-in. lengths, to represent the rivets of the origi- nal ship. The brads can be obtained ready nickeled to match the covering. We will start with the wooden frame- work for the fuse- lage. It consists of a tail block, nose block, bottom board, two sides, a bulkhead between the passengers’ and pilot’s compart- ment, and a floor block for the pilot’s cockpit. Tail, nose and floor blocks are of white pine, and sides, bottom and bulkhead of three- ply wood, % in. thick. In lieu of plywood cigar-box wood can be used, but the former is preferred, as less likely to split under bending strains.

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The tail block, shown in Figs. 1 and 1A, comes first. It is cut from a block of white pine, 9'%e by 2% by 1% in. Lay out the side pattern first from Fig. 1, which is full size, except that it is “broken.” The project- ing part, curved on the underside, fits over the top of the wing. Care should be taken to follow the proportions of the curve exactly in con- structing your pattern. The % by 1-in. slot at the other end is to take the hori- zontal stabilizer. After you have cut the block to the side dimensions, lay out the top pattern, and, with a scrollsaw, complete the sides, taking care not to break the thin ends. The nose block, Fig. 2, comes next. It is cut from a block of white pine, 1% in. square and 13 in. long. Measure in %e¢ in. from one end around three sides of the block, and take a saw cut % in. deep. On the cor- responding faces of the end, measure in % in. and saw down, cutting away the three pieces, forming the rabbets in which the sides and bottom will fit. Find the center of the other end of the block and inscribe on it a %-in. circle. If a lathe is available, the block can be turned down to this dimension, as shown in the sketch. Otherwise it may be cut down with the chisel and finished with a fine file and Above, a Northwest Airways Ford Ship in Flight; Inset, Mr. Bullock, the Author of the Article curve will carry out the lines of the fuselage when com- pleted. The block tapers out, when finished, from the %-in. nose to the 1%-in. rabbeted back. The draw- ing, Fig. 2, might seem to indicate that the block ta- pered up from the rabbeted end, but this is due to the perspective, and the block really tapers the other way. A reference to the photo on page 1031 will make this clear. The floor block for the pilot’s cockpit is cut from white pine “¢ in. thick. It is 1% in. wide at one end and 1 in. at the other, as in Fig. 3. Next comes the bottom of the passenger compartment. A full-size template for this is given in Fig. 4, so no special in- structions are needed. Either %-in. ply- wood or other material of similar thick- ness is used, cut out and filed to size. The sides of the coarse sandpaper. The sides are slightly curved, and not straight as in a The prices. true cone, A complete set of parts can be obtained, at a moderate cost, for. making this splendid model. Write to Amateur Mechanics Dept. for list and fuselage are shown in the full-size tem- plate, Fig. 6. There are six windows in a row and a smaller 1027

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Ee rennin 1028 POPULAR MECHANICS RUDDER Fig.5 BOTTOM OF FUSELAGE Fic.4 eo ae oY aS ee.

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window above the forward one. The V- shaped notch in the top, with its upper side slightly curved, takes the rear, or trailing, edge of the wing, when the as- sembly is completed. needed, so, after transferring the pat- tern to a piece of the %-in. stock, fas- ten two pieces to- gether with small brads and saw them at the same time. This saves time and insures the two sides being exactly alike. Drill holes in the spaces marked for the window openings, thread the blade of the coping saw or jig saw through the holes, tighten it in the frame, and saw out the openings. It is best to cut the outline of the pieces first, however, as, if one attempts to cut the window open- ings first in a large sheet of the ply- wood, it is found that the swinging of the saw is awkward in some places. Cut the pieces from the sheet to the approxi- mate size necessary, trace the pattern on one, brad them to- gether, and then saw out the outlines of the pieces, leaving the win- dows to the last. Fig. 8-shows the bulk- head or partition be- tween the passenger compartment and the pilot’s cockpit. The il- lustration is full size, and can be transferred with carbon paper to a suitable scrap piece of the %-in. material. Fig. 7 gives the dimensions for the ver- tical fin. The long side is the base, which later will be attached to the tail of the fuselage. Cut the fin, like the rest of the POPULAR carbon paper. sides are MECHANICS WALTER BULLOCK, an old- time pilot, as pilots’ ages go, who got his start barnstorming in the days when planes wore their propellers behind and were pushed through the air instead of being pulled by tractor air screws, is, in his spare time between runs, a builder of fine scale del His dels of the big Wasp-engined tri-motored Ford air liner, which he flies be- tween Chicago and St. Paul-Minne- apolis, have been widely acclaimed for their fine workmanship and exact detail. In this and subsequent arti- cles Mr. Bullock tells how to build a metal-covered scale model of the plane he flies. 1029 tail assembly, from ‘%-in. stock. The rudder is shown in Fig. 5, full size, and is transferred direct to the stock by using Fig. 9 shows the horizontal stabilizer, with all dimensions, and Fig. 10 the ele- vators, of which two are needed. Both can be cut at once by tacking two strips of the %-in. stock together, after laying the pattern out on one piece. The ailerons are shown in Fig. 11. Be sure to cut these to exact size, as they must fit into recesses to be cut in the wing. This completes the woodwork of the fuselage, and you are now ready to assemble the parts, round off the top and finish it. Set up the tail block and hold one of the sidepieces against it, match- ing the V-notch in the top of the side with the overhang of the tail block, into which the wing is to fit. Mark the top and rear edges of the side on the tail block, and cut out a recess to a depth of % in. Do the same with the other side, then cut a %-in. rabbet in the bottom of the tail block to take the floor of the fuselage. One end of the bottom board measures 1g in.; this end is the rear. Glue it to the tail block, and reinforce the joint with some small brads. Glue and nail the other end in the recess in the nose block. Be sure that the after side of the nose block and the forward end of the tail block are square with the center line of the bottom, to prevent the fuselage mh I SAA Se PAE ete

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ere EEE PETE NTIE ER rr a eee —————————————e——— ee Ro AA rn cresee ms pear Eom 1030 from being “in wind” or twisted when the sides are put on. You are now ready for the sidepieces. First glue and nail them to the tail block, taking care that the notch in the side ex- actly matches the curving overhang of the tail block. Next, gluing and nailing as you proceed, bend them to fit against the bottom board, and bend the latter un- til it matches the edge of the sides. A few small clamps will aid greatly in this operation. Bend the pieces gently to fit each other, following the bend up with small brads, carefully driven in to avoid splitting the thin wood. Take the same precaution when fitting the sides as with the bottom board, that is, see that they fit the recesses or rabbets in the nose and tail blocks properly, and that neither the nose nor the tail is “cocked” up or down in relation to the sides. There is little dif- ficulty in assembling the pieces, but some precaution is essential, if the finished fuse- lage is to be perfect. Countersink the nails with which you attach sides and bottom to the nose block, sf" STABILIZER 5g 2 “e . rs se bead ee hes 4 Le a hig ” AILERONS, 2 REQ. 6 z+ _ Fie. Pe sd i . 4 7" ‘ ’ lig 7 ' + at ’ 1 kg " . = VERT BULKHEAD 3 aa Fic.8 Fic.7

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and with chisel or knife and sandpaper smooth the sides and bottom to match the curve of the nose block. Rounding off the top of the tail block is next in order. Draw a line from the rear point of the V-notch in the sidepieces to the lower edge of the stabilizer slot, on either side of the tail block, and round the block down, from the top center line to the side lines, giving it an easy, smooth curve. Glue the floor block for the pilot’s com- partment to the floor, sides and nose block, and glue the bulkhead in place behind it. The bulkhead should be flush with the projecting portion of the sides, which con- tain the small upper window. That completes the wooden portion of the fuselage. Next comes the cowling around the pilot’s cockpit. This is cut from a thin sheet of galvanized iron, % by 5 in., to the template given in Fig. 12. POPULAR MECHANICS

Below, Fr k of Fuselag Completed; Note the Position of the Bulkhead and How the Cowling Is Fitted to Nose

~~

Transfer the pattern to the galvanized Block and Sides iron, and with a cold chisel cut out the windows, smoothing the

edges of the cuts with a small file. Next, with tin- ners’ snips, cut out the outline. Bend the two center flanges to a right

PETER 0 PEE ETS Ry

angle. Then bend the strip in the center in a right angle, as shown, and make the two 45° bends to bring the sides back parallel. Drill the two small nail holes, as shown. Place the cowling over the nose, matching its rear side windows with the small upper windows in the fuselage, and nail it in place with two small brads. The small flanges on the sides of the cowling, below the windows, are not bent out, neither are they fastened to the fuselage at this stage. The metal covering that is to be applied later holds them down. The small brads on the front flanges are withdrawn when the metal covering is applied and, after the cover- ing is replaced, driven into place again through the metal. The dotted lines in the drawing at the right in Fig. 12 show the points where the bends are made. The-small flanges are bent to suit the nosing of the plane, and the other bends as shown in the draw- ing at the left. The full lines in the latter sketch indicate the sides of the cowling and the outer edges of the small flanges; the dotted lines, to which the degree arrows run, are the vertical portions of the cowling, at the front. You are now ready to make the wing, and next month’s article will give instructions for this, and also tell you how to apply the metal covering to wing and fuselage, and fashion the roof of the pilot’s compartment, while succeed- ing installments will be devoted to the making of the landing, propelling and control gear and the rigging of tail surfaces and ailerons.

Pee TR

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we 1032 POPULAR Canvas Floor Covering for the Kitchen Is Cheaper than Linoleum Canvas floor covering for the kitchen, porch or summer cottage has been found entirely satisfactory for those who do not desire to purchase linoleum, and the cost of the canvas is less. It is also very easy MECHANICS CUPBOARD VIM LLL ELLE SINK to lay, as it is pliable, permitting it to be rolled and folded to get around stoves, boilers and cupboards. The finished job is waterproofed by painting and varnish- ing it, and this practically cements the canvas to the floor. Get 12-o0z. duck of 30-in. width for the purpose. There are 1ST. LAYER--~, QMO LAYER * Canvas Is Cheaper and Easier to Lay Than Linoleum and Is Useful for the Kitchen, Porch or Summer- Cottage Floor two methods of laying it; one in which the tacks at the joints show, and the other where they are completely hidden. The latter method is preferable as the tack heads will eventually rust if exposed, due to the paint wearing off. The details of laying the canvas are shown in the illus- tration.—John Steinke, Cleveland, Ohio. Auxiliary Magazine for Shotgun Owners of single-barrel shotguns will find the auxiliary barrel, shown in the il- lustration, quite a convenience, as it permits quick ac- tion. It consists of a bicycle-pump cyl- inder, a coil spring, just fitting inside of it, and three spring - brass clamps, one for the open end of the pump cylinder and the other two SHELLS7 Pump for “ 2 BEE AE Co i Rt NY ES SS SB Handy Cagis Miagetien Made from Old Bicycle ingle-Barrel Shotgun clamping the cylinder to the gun barrel as indicated. A wooden plunger fitting loosely inside of the cylinder is also pro- vided. In use, the loaded shells are pushed against the plunger and into the mag- azine. After a few shells are pushed in the stop spring is brought down, pre- venting the shells from being ejected. To remove a shell, the stop spring is pushed up—C. M. Wilcox, Torring- ton, Conn. PLUNGER —- ' COIL SPRING -’

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Postage Stamps Prevent Headlight Glare Sticking postage stamps on the left side of your glasses to protect the eyes against glare from approaching autos is a good measure for a motorist to adopt. In the absence of stamps, use the gummed part of an envelope or a piece of adhesive or friction tape—W. G. Webb, Hudson Falls, N. Y. Regluing Veneer on Curved Surfaces A problem often met with by the home mechanic is that of refastening veneer which has been loosened as a result of water-soaking or drying of the glue. This occurs frequently on chair joints and seats, on curved dresser fronts and a va- riety of places where rare veneers are used. In factories, cauls or specially shaped forms are used, but these would take considerable time to make at home. The following method has been used with success: First loosen the veneer with a knife and scrape away the dust and old glue between the veneer and the solid wood or core. Then apply glue to both surfaces. Have ready some fine, clean sand that has been heated in a pan. Fold a quantity of the sand inside of a piece of heavy cloth or canvas to form a cushion. Put the cushion over the loose veneer witha piece of brown paper between them. Lay a_ block of wood over the cushion and clamp to- gether, as in- dicated in the drawing. Un- der the pres- sure of the clamp the ve- neer will be held against the wood at all points. Al- low the glue to dry for 24 hours and then remove the cushion. Usually the paper sticks to the wood, but this can be removed with a moistened cloth—E. L. Bilodeau, Corry, Pennsylvania. {SOLID WOOD CORE , VENEER CUSHION FILLED {WITH HEATED SAND POPULAR MECHANICS Arranging Cut Flowers ia a Shal- low Dish Containing Moist Sand Arranging Flowers in Shallow Dish Cut flowers with short stems are rather dificult to arrange in a shallow dish. Partly submerged, they float around in the water and it is almost impossible to keep them set in an attractive way. By using moist sand instead of water the flowers will look just as fresh as they do in water, and any desired effect in color scheme and general makeup can be ob- tained with assurance that it will last as long as the flowers live. Spreading Liquid Glue Quickly Difficulty is sometimes experienced in spreading liquid glue evenly and quickly over a large surface. This can readily be done, however, by using a spreader made by notching the edge of a piece of linoleum or stiff cardboard, about 6 or 8 in. long. The notches are cut at intervals of % in. on the long side of the linoleum, producing a sort of comb. It is advisable to make the tool about 5 in. wide, so that the fingers will not come in contact with the glue. Then pour glue on the surface to be covered and you will find how evenly and quickly it can be spread.—Douglas Leechman, Ottawa, Can. ke NT Ne I 9 «PLP aa a eT ee ners FE AE TS SEAT IF

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Sorter aes aa POPULAR MECHANICS the motor side of the dash or carried in the tool box. —A. C. Wilson, Colum- bia Cross Roads, Pa. Imitation Brick for the Christmas Fireplace For the Christmas fire- place and other decora- tions involving the use of imitation brickwork, realistic effects are ob- tained by making “bricks” from 2 by 4-in. wood and painting them red. The mortar joints are closely imitated by using strips of plaster- Small Wooden Airplane Supported on Strong Overhead Cable Brings Large Profits to Its Child Owners There’s Money in Aviation This novel trolley airplane brings its young owners five cents per ride and all the children in the neighborhood are just eager to take the air in it. The plane is made of wood and is supported by a stout _ overhead wire cable securely fastened at both ends. The propeller is made of wood pivoted on a pin so that it will turn, but the real propelling force is a boy who is glad to push the plane for a small por- tion of the profits. One day the profits amounted to $3.15. Handy Spark-Plug Container Spark plugs will be safe from being broken if carried in a simple wooden container made from a piece of 2 by 4-in. stock. Four or more holes are drilled in the piece, as shown, to accommodate the spark plugs, and a wooden cover, made of Y%-in. stock, pivoted to one end with a wood screw, holds the spark plugs in the case. It may be mounted on board, sawed a trifle nar- rower than the _ bricks. Materials such as ma- sonite and celotex can be used to furnish shades of brown and buff mortar. “Head- ers,” that is, bricks laid end to the sur- face of the wall, are made half the size of regular bricks or “stretchers.” If it is desired to make the finished job more or less substantial, long nails can be driven through the bricks to hold them together. Automatic Shut-Off for Outboard Motor In racing outboard mo- torboats many use a motorcycle twist grip on the throttle control. It frequently happens that the racer tips over and finds = that one or _ both of his cylinders are cracked owing to water getting in through the breather pipe. This can be prevented by using a rubber band cut from an old inner tube. The band is attached to the handle by means of an improvised wire hook, and is slipped over the control lever of the throttle so that the moment one releases the twist grip, the throttle will close.—H. E. Whiting, Rochester, Minn. / WIRE HOOK TWIST GRIP,

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POPULAR MECHANICS 1035 Improving the Crosscut Guide Large work often has to be cut with a small saw, and an extension of the crosscut guide as shown in the drawing will facilitate the performance. Its prin- cipal object is to support the outer end of long work when making a square cut, or tenoning and grooving with the dado head. In this instance, the guide was made to the dimensions given for a 15 by 17-in. table. The wood used was sea- soned hard maple, % in. thick. Quartered oak of the same thickness may be used as a second choice. Rip a piece of either material 2 in. wide and of the required or desirable length. Plane the edges care- fully, making sure that they are perfectly square and true lengthwise. The beveled piece C is 30 in. long and 5 in. wide. Cut out a portion of it so that the iron guide will fit as indicated. Drill ™%-in. holes through the face of the iron guide and fasten it with wood screws to a piece of stock set on edge against the piece C. Be sure to bring the guide exactly to the square position. Part A consists of two pieces, each 5 in. long, glued together and fastened to the guide with screws and glue, being rabbeted as shown to ride on the underside of the saw table. Only suf- ficient clearance should be allowed for the guide to move easily. If the table edge is rough, smooth it with a file. The pieces B are fastened with screws and glue. The curved piece is sawed to the shape shown, about 10 in. long, and serves to support the guide in case the saw is run in or the dado goes some way beyond the edge of the work. Screws are also used to fasten it. Although it is neces- sary to cut into the guide with both the dado and the saw, the guide will not be im- paired if the operator is careful to let the cut run no farther than necessary.—W. Clyde Lammey,

--SAW TABLE, 15X17”

Extra Shelves behind the Basement Stairway Provide Good Place for Preserves Extra Shelves in the Basement Provide Storage for Preserves Extra shelves that are out of the way can be readily built behind the basement stairs. The shelves stretch the full width of the stairway and cleats are nailed on each side, as shown in the photo, to support them. Paint cans, preserves, etc., can be kept on these shelves without any risk of being knocked off.—Morton Schwam, Philadelphia. Black Ink for Writing on Glass Does Not Spread Writing on glass with black ink is usually not successful, as nearly everyone has found, but it can be done with a solution made of sili- cate of soda, 2 parts, and in- dia ink, 20 parts. Use an ordinary writ- ing pen of good quality. This ink will not flow out on the glass sur- 3 face after being applied, but will remain just as written —L,. H. \ th oa QP _><-\R0n Guiwe ”

a Crosscut Guides on Small Circular Saws Can Be Greatly Improved by Georger, Buf- ' Downers a ” a Providing This Wooden Extension falo, N. Y Grove, Ill.

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A Heated Cafe for Birds By D. R. VAN HORN 6 ets FIRST time your winter birds poke their heads into this heated win- ter shelter, with warmth radiating from a lantern inside, they will no doubt wonder what it’s all about. But it won’t take them long to decide that this is a pretty decent place to swap gossip and warm their toes, to say nothing of the food. By setting up this cafe, all the birds in the neighborhood will make it their rendez- vous this winter. An ordinary storm-proof lantern, which you no doubt have on hand or can get for a small sum, furnishes the heat inside. The large door faces the south and this is partly covered with a frame to which a sheet of celluloid or glass has been fas- tened. This keeps out most cold breezes or storm—yet lets the sunlight through. Set at the top of a pole mounted be- tween two posts, the cafe can be lowered = at any time for refueling or put- ___HINGED TO —post CLEAT) r VIEW OF FEEDING SHELTER This Heated, Easily Tended Feeding Station Will Keep the Birds Happy All Winter 1036

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ting out more feed. The box is hinged at the top and hangs vertical when lowered. While the dimensions may be varied to suit, a good size is 12 in. wide, 10 in. deep and 18 in. high. You can also alter the design, but the one shown represents a snug, attractive and weatherproof affair, easily made from %-in. lumber, straight from the mill or from old boxes. Make the front side nearly all open, consistent with good appearance. Let the backboard extend above the peak of the roof 2 in., as a pair of hinges go here. The floor also should extend 2 or 3 in., and if you feed oats or other light grain, you may find that a low railing, about 1 in. high, will be helpful in preventing grain from blowing out. Next, build a frame for the front from Y%-in. material, 1 or 1% in. wide. Miter the corners and use four-penny finish nails to hold the pieces together. Cut a shoulder around the inside back edge for glass if glass is to be used. If a cellu- loid or celloglass sheet is being used, sim- ply tack this down. A ribbon of rubber cement about its edge will make the joint tight. Now hinge the frame at the top to the front side of the cafe. Use a pole from 10 to 12 ft., high be- tween the two posts, for the support. Nail two cleats, spaced 12 in. apart, at the top. and then hinge the top of the back- board to the top edge of the upper cleat. The lower cleat simply makes a broader spot for the lower part of the cafe to rest against. In a hard wind this will swing out slightly, but not enough to cause damage. All that now remains to do is to fill the lantern and set it inside by raising the front glass frame. The frame of the lan- tern will keep the flame far enough away so that there will be no danger of fire. During cold weather, especially when the ground is covered with snow, the cafe should be lowered daily and more feed put in. The lantern can also be filled once every one or two days, the wick being turned down until there is only half the normal flame. One of the best winter feeds for birds is, of course, suet. Put out, with this, bread crumbs and various kinds of grains. You can tell, with a little experimenting, which kinds of grain are in greatest demand. POPULAR MECHANICS Hookless Fastener Applied to Child’s Bedding Insures Keeping Covers On Cover for the Child’s Bed As a means of preventing a child from kicking aside its bed clothing on a cold night, the arrangement shown in the drawing will be found serviceable. The cover is pinned to the side of the crib and is made to open and close in the center by means of a hookless fastener. Such fas- teners can be salvaged from discarded gar- ments or bought at department stores. Rubber Tube Keeps Spark Plugs Dry When moisture gets under the hood of an automobile, as is often the case when the car is washed or when it stands out in a driving rain, the spark plugs will not function. This is due to the high-tension current short-cir- cuiting over the wet porcelain sec- tion of the plug between the top and the body. To prevent such trouble, slip a 3- in. length of rub- ber tubing over the cable end and porcelain sec- tion of the spark plug, as shown in the drawing.—F. W. Wilhelm, Cin- cinnati, Ohio.

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1038 POPULAR MECHANICS Washer Makes a Good Hermaphrodite Attachment for Dividers For use with the ordinary dividers, a satisfactory hermaphrodite attachment can be im- provised by the use of a washer. Take a washer 4 or % in. in diameter, and bend it dou- ble, laying a small nail be- tween the sides as they close at right angles to the bend, and then hammer- ing them down over the nail. This makes a small sleeve or pocket for the divider point. The washer can be conveniently held against the work while scribing. Potting House Plants . A common mistake with potted plants is that of overfilling the pot. A properly potted plant should not have the earth heaped up around its stem and left level with the rim of the pot, but should have the ground level an inch or so lower than the rim in moderate-sized pots and more than that in !arge ones. There should be room for the water of a moderate irriga- tion to stand for a few moments, while it soaks down into the soil, without washing any of the dirt over the edge. Another sin we are apt to commit against the plant is one of omission: We are prone to want to fill the pot with good, rich soil, without providing for ven- tilation or bottom drainage. The hole in the bottom of the pot should be covered loosely with a broken bit of another flowerpot or some such potsherd. Then a layer of loose pebbles or cinders should be shaken on the bottom, and on top of this the soil in which the plant is to be set. The soil of ordinary back-yard gar- dens is too heavy and close for potted plants. It should be mixed with sand, and especially should it have leaf mold, or humus from the woods, added to it. This will give it a much lighter, porous char- acter, decreasing its tendency to puddle after watering. It will also enable the pot to drain more quickly, giving better soil aeration; roots need air as well as water. Our usual tendency is to overwater plants, and then let them stand with their roots in the mud, threatening them with “smotheration.” Water may be supplied in the usual way, by pouring it on top, or by setting the pot in a deep pan of water and letting it soak up from the bottom. In either case, however, the pot should be set aside to drain for a while. The common practice of setting a potted plant in a jardiniere half full of water and leav- ing it there should by all means be dis- couraged. The plant should be lifted out of the jardiniere for watering, then re- turned and set on a couple of blocks of wood, and be left standing there so it will drain. Water should never be allowed to accumulate in the jardiniere. When the leaves of ferns, for example, begin to turn brown, the common assumption is that the plant requires water, whereas, as a matter of fact, it may be getting too much water from standing in a half-filled jardiniere. Photographing Moving Objects Taking photos of moving objects is greatly simplified by the camera sights shown in the drawing. They are made of sheet metal and two small hinges having one screw hole. It is necessary to arrange the sights so that, when the user sees the object through them, it will be in the range of the camera. When not-in use, the rear-sight hinge is folded down flat and the front sight is turned in front ofthe lens. The release string can be coiled up in the usual way.—George Thompson, Ther- mopolis, Wyo.

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sha Decorating with a Pastry Gun By J. S. HAGANS rok the decoration of plaques, panels and other decorative objects, textone or similar plastic paint, applied with a pastry gun, or, as it is sometimes called, an icing gun, offers endless possibilities. By the simple process described almost any degree of relief can be obtained, and almost any form of ornament applied. The only equipment required is the pastry gun, and the only material a quantity of the plastic-paint powder. Almost any kind of base will serve for the application of the decoration, al- though, for the plaques, etc., that the process is specially suitable for, wall- board forms the lightest and most desira- ble base. Given the object to be deco- rated, the first step is the preparation of a suitable background. In the examples shown, this is done by the application of a coat of the plastic to the surface with a brush. While still wet, the surface is ma- nipulated with the tips of the fingers, sweeping them in a circular motion over Using the Pastry Gun to Form the Outline of a Ship for Plaque; Right, Design for Picture Frame or Dis- play Stand oy a EE

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eer ~ Serge vy SS eee 1040 POPULAR the plastic, and forming an irregular back- ground of pleasing form, but with no sug- gestion of pattern. Allow the work to dry, which will take overnight, and then sandpaper down the rough ridges of the plastic. Assuming that the design for an orna- mental border has been selected, the next thing to do is to trace this onto the sur- face of the piece. The pages of magazines offer an endless variety of designs suit- able for the process of decoration. If the design selected for the border or panel is small, it is recommended that it be en- larged to the proper dimensions by means of a cheap pantograph, which can be ob- tained at any art store, unless, of course, one has some ability as a free-hand drafts- man, when the design can be sketched di- rectly onto the background. When laying out borders for frames, panels, etc., it is sometimes difficult, even for the experi- enced draftsman, to get both sides of the design alike. This difficulty is overcome by drawing one half of the design, full size, on a sheet of paper, as in the sketch, page 1039, and then tracing this half onto the background. The paper is then turned over, matched with the first trac- ‘ing, and the other half traced. The de- sign, of course, is drawn heavily enough so that no difficulty is encoun- tered in following it on the back of the paper. With the outline drawn on the back- ground, it is only necessary to fill the gun with the plastic paint and follow the outlines, in ex- actly the same man- ner as the pastry cook decorates her cakes, leaving a stream of the plas- tic to form the de- sign. This is al- lowed to harden. The whole is now coated with white shellac to kill the porosity of the ma- Bird-of-Paradise Design for a Wall Panel, an Article of Furniture That Will Brighten Any Living Room MECHANICS terial. In the examples shown in the il- lustrations, the raised outlines of the pic- tures have been coated with glossy black enamel, and this is done after the shellac is dry. With the outlines coated, the re- mainder of the background is then col- ored. This can be done either in solid color, or by an adaptation of the poly- chrome method. In the latter method, the part to be dec- orated is coated with paint and allowed to dry. Then a coat of some contrasting or harmonizing color is applied, and, while still wet, a part of this is wiped off. This removes the second color on the high spots, allowing the first coat to show, while the second color remains in the lower parts of the background. Some- times three or more colors are used. An examination of a commercial article will show the process of polychroming in a few minutes. No directions as to color can be given, as obviously this depends entirely on the article being decorated, but it may be said, in general, that for small objects, bright colors may be used, while for larger ones the colors must be more subdued if the effect is not to be glaring. The articles illustrated at left on the op- posite page, while not entirely deco- rated by the pas- try-gun method, show what can be done in the way of furniture decora- tion with plastic paint and wall- board, either for the home or for window -display purposes. With the exception of the “pottery,” all the articles are built up from wallboard. These few exam- ples will suggest numerous others to the alert reader. For example, the antique lantern, in imitation of beaten copper or iron may be made either fo «2702 WIA

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POPULAR MECHANICS 1041 from thin wood or wallboard. Skill in joining the parts is unnecessary, as the joints are all covered afterward by the plastic. The hammer marks are formed in the “metal” by daubing the moist sur- Right, Another Decorative Wall Panel; Left, All the Articles Shown in This Photo, Including the “‘Pottery”’ and the Chest, Are Finished with Plastic Paint, in the Simplest Manner polychroming, it will gen- erally be found advisable face with the finger tips. If the effect of iron is desired, the surface is painted dark gray and allowed to dry. Then apply a coat of aluminum paint and wipe off the high spots. When dry, kill the high gloss of the aluminum with a thin glaze coat of burnt umber. For antique copper, use a green-paint base and a _ copper-bronze overcoat in the same manner. The frame at the left of the lantern is made of wallboard also, the relief decora- tions being applied with the gun. A nar- row brush can be used for these, if desired. This frame is finished in gold, with a sec- ond coat of green, wiped off as before. The pottery on the table is just cheap glassware of the “five-and-ten” variety. They are simply coated with plastic and given various polychrome finishes. In to apply the metallic- bronze coat first, allow this to dry, and then apply the paint coats that are to be wiped off. Some bronze paints absorb color from the second coat, and this is particularly true of aluminum bronze, so, wherever this is used, apply a coat of white shellac over it before put- ting on the color coat. The antique chest is built up of ply- wood, or, if it is to be used solely for dis- play purposes, and if it will bear no great weight, it may be made of wallboard over a wooden frame. The panel effect on the top is quite simply obtained by tacking down a rectangle of wallboard over the top proper, no matter what the construc- tion of the box. The ornamental border is cut with a coping saw from a thin strip of plywood and tacked in place. The whole box is then given a coat of plastic, tex-

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1042 POPULAR tured with circular movements of the fin- ger tips, the border design’ being modeled with the tip of one finger. The edge of the lid is textured by making a series of verti- cal grooves with the finger. When hard, the surface is lightly sanded to soften the effect, and finished as desired. The one in thé photo is treated with black paint and silver-bronze to produce the popular an- tique-silver effect. ’ Handy Shop Bulletin Board Where framed signs and notices have to be changed fre- quently, the frame, unless it has been espe- cially made for the purpose, must be taken down to insert a new sign after the old one has been removed. This inconven- . ience can be mot FOR SIGNS overcome by using the bulletin board shown in the il- lustration. It consists of a three-sided wooden frame with a groove on the inside to receive a glass pane. Insertion or re- moval of notices is made through the open top—Herman R. Wallin, Brooklyn. Correct Method of Repairing Car Chassis Loose frame members in autos are a source of rapid depreciation, cause con- siderable noise and involve an element of danger. Cracks frequently start from holes in which rivets have loosened owing to vibration and strain. Looseness and cracks can best be detected by rubbing chalk on the outside of the member around the head and then squirting pene- trating oil against the other side. Another test, but one which requires more skill, is tapping the rivet with a hammer. Avoid welding whenever possible, because of the spoilage of near-by paint and possible injury to heat-treated metal parts. Shear off the head of the loose rivet with a MECHANICS chisel and hammer or drill it out. Ifa crack has started from the rivet hole, trace it to its end and drill a %-in. hole through the frame at that point, to check further cracking. As rivet holes will usually be found to be elongated, enlarge the hole by reaming to about .004 in. un- der the diameter of the next larger cap- screw. If the threaded portion of the latter is a trifle less than the combined thickness of the frame members, it will be necessary to chase the threads down nearer to the head with a die. The collar of the screw should be a tight drive fit in the hole. Use an extra-thick new lock washer, and tighten the nut as much as possible without stripping the threads. The writer has used this repair for many years and his experience is that it will prove permanent.—Paul Leo, Elizabeth, New Jersey. Holding Small Objects in a Vise When small objects, such as brass ter- minal heads, have to be tapped, there is considerable difficulty in holding them in a vise. I have found it better practice to grip the tap in the vise and hold the ob- ject between a pair of dies of the sliding type. It is then an easy matter to tap the work.—L,. Moran, Dublin, Ireland. Device for Testing Valve Springs The drawing shows a simple method of testing the strength of valve springs, mak- ing use of a scale, a length of 2 by 4-in. stock, a number of stop blocks and a cleat. The cleat is nailed to the bench leg, a hole is bored part way through the 2 by 4-in. mate- rial to receive the end of the spring, which is set on end on the scales, and the stop blocks are ar- ranged as in- dicated. By pushing on ‘\~--STOP BLOCKS

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POPULAR MECHANICS the improvised lever thus arranged, the strength of the various springs can readily be determined and the weakest ones re- placed. The stop blocks insure that ex- actly the same amount of pressure is ap- plied to each spring. Test Shows Filter Reduces Oil Changes If automobiles are equipped with oil filters, frequent changes of the oil in the crankcase are unnecessary, a test trip across the continent tends to show. On the trip, during which the speedometer showed 10,025 miles of travel, it was found that, after a change of oil, the viscosity dropped rapidly for about 200 miles, and then changed little for 500 miles. The tests on acidity showed much the same results, the acidity rapidly rising for about 200 or 300 miles, and then showing small variation. In addition to the oil filter, the car was fitted with a crankcase ventilator, and both carburetor intake and breather were protected against dust. New Type of Filing Cabinet Takes Little Space Light and compact, this novel filing cab- inet, made in the form of a sloping box, has handy fea- tures which make it highly useful for cer- tain purposes. It is 37% in. high at the back and 22 in. high at the front, and measures 16 by 24 in. in length and width. The opening of the box is 31 in. long and is divided into 22 compartments. The divi- sions consist of pieces of wallboard slipped into 4¢-in. slots cut in the sides. The ma- terial used for building the cabinet is white pine. A hinged lid, made by plac- ing a wallboard panel in a suitable frame, is provided. @A piece of cord is useful as an emer- gency gauge in resetting a camera tripod, or in preventing it from shifting. 1043 Reflecting Light into Dark Corners Saves the Work- man’s Time Work Lighted by Reflector Polish the surface of an ordinary cellu- loid visor or place a mirror on your cap so that it will reflect downward on the work, as shown in the drawing. In this way any dark corner, or bottom of a hole where a screw must be driven, can be lighted sufficiently to save considerable time.—Geo. K. Sangster, Namu, B. C., Canada. Using a Hacksaw in Confined Places When it is necessary to use a hacksaw in confined places, try the method indi- cated in the illustration. The blade is ground down to a point and is held in a handle made of pipe. The pipe is cut through lengthwise on one side and two screws are used to tighten the handle on the blade. This tool has been found es- pecially useful by electricians in cutting through metal lath, armored cable, scrap- ing insulation and many other opera- tions. It can be assembled in a few min- utes and will serve as a val- uable supple- ment to any tool kit.

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} ‘ fa F Sg, ee a er oF 1044 POPULAR MECHANICS Angle-Iron Corner Fixture for Clamps Difficulty is often experienced in fas- tening mitered corners together while the work has to be held square. Fig. 1 shows how a piece of 2-in. angle iron of ap- propriate length and a pair of clamps can be « used to advantage. Fig. 2. illus- trates a fix- ture that is of consider- able value in working with = sheet metal, Fic, 2 for holding the pieces together while welding, braz- ing or other operations. Three pieces of angle iron are fastened together, while a fourth piece, of which the center section is cut away, is also provided. In use, the work is placed inside of the main part of the fixture, and the slotted section is pushed in against the work to hold it ‘firmly in position, after which clamps are applied. The fixture can be laid on a bench horizontally so that melted solder or spelter will run into the corner of the work instead of collecting along the sides. Repairing a Short-Circuited Armature Section To locate a short-circuited armature section, pass a current from a dry cell or storage battery through the armature, using the brushes of the machine. Using a low-reading voltmeter—a millivoltmeter if possible—touch its lead wires to one pair after another of adjacent commutator bars. A zero deflection of the voltmeter indicates a short-circuited section. It will be noticed, at periodic intervals in pass- ing around the commutator, that the voltmeter deflection reverses, and that just before this transition point the deflec- tion is less than normal. This merely indi- cates a passage from one pole to another on the winding. On a four-pole armature, for instance, there will be four such re- versals of the meter deflection. Switching of lead wires is all that is necessary to make the meter read in the right direc- tion. If a short circuit is found, clean out the spaces between commutator bars, to be certain no small bits of metal or cop- per dust are responsible. Failing thus to locate the trouble, carefully lift out the coil connected to the bars to which the short was traced, and repair any breaks in the insulation. Shellac and silk ribbon are the best materials for this work. Ap- ply the ribbon smoothly, coating it thor- oughly. A broken circuit in the winding itself may be located by connecting a battery through the ammeter to two metal strips, held apart by a piece of wood at such a distance that they will touch adja- cent commutator bars. Holding this de- vice against the commutator, turn the armature slowly by hand. A reduced de- flection of the ammeter indicates a broken or open-circuited winding. The only re- sort, in this case, is to lift out the dam- aged coil, solder the ends together, rein- sulate and replace the wire in the slots. Automatic Milk Cooler Cooling milk automatically with the il- lustrated device saves the farmer consid- erable time and keeps the milk more sanitary. It consists of a wooden tub in which a milk can is placed, and a paddle arranged in- side of the can, The pad- dle is actuated by means of a pivoted crossarm, to the ends of which small cups are at- tached. The cups fill and empty alter- nately with water, the weight of which causes them to drop, and they are then automatically turned over so that the water runs out and causes the emptied cup to rise while the other one goes down and is emptied in the same way. The arrangement for filling the

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POPULAR MECHANICS cups alternately is simple. A container, which is funnel-shaped at both ends, is pivoted on a ver- tical rod, which supports the en- tire moving apparatus. Two brass or copper tubes, soldered to the end of each opening of the up- per container, lead down to the two cups, the bails of which are swiveled on the ends of the cross- arm. A small hinge is soldered to the lower edge of each cup and to the side of a metal trough large enough to receive the wa- ter from the cup. When the cup is filled, it swings over and pours the water into the trough. Each trough is drilled to permit the water to run down into the wooden tub. This hastens the cooling of the milk. The paddle moves from side to side as the cups go up and down on the ends of the crossarm. A water hose is clamped to the upper container so that the water runs into one cup while the other one is being emptied.—Bert T. Williams, Clintonville, Wisconsin. How to Hold a Fender Bow When removing dents or bends from a damaged auto fender, it is often rather hard to keep it from flaring outward while hammering the metal back to shape. A Cleveland workshop made the illustrated device to prevent this. It con- sists of lengths of 4% by 1%-in. flat iron. Two long pieces have loops at one end to allow a third length to slide in them so that the bar can be adjusted to any desired length. Thumbnuts Arrangement of Steam Shovel Enabling It to Lift Truck Sunken into Soft Dirt near Excavation Steam Shovel Lifts Heavy Truck After sinking into soft dirt near the edge of an excavation, where a steam shovel was loading dirt into it, a five-ton truck was unable to pull out on its own power. No tractor was available to tow it and it seemed that the work would be held up for some time. However, the re- sourceful engineer of the steam shovel solved the difficulty in a few minutes by giving the truck a lift. A heavy chain was slipped around the truck and the top por- tion hooked over the shovel. Prolonging the Life of Hammer Handles The life of a hammer handle may be prolonged if the wedges and head are removed and_ the or setscrews are provided to hold the pieces together after the proper ad- justment is made. Short lengths of flat iron and thumb- nuts, arranged in a similar manner, are used to clamp the bar to the fender as illustrated—A,. E. end soaked in lin- seed oil. The end should be placed in the oil and allowed to remain for three or four days. It should then be re- moved, wiped off and allowed to dry for a week before the head and wedges are replaced. The Granville, La resulting toughness Grange, IIl. Adjustable Bar Holds Auto Fenders in Shape While Dents Are Hammered Out will be surprising.

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Tee a pte ae z re Fic.9 END VIEW By EDWARD THATCHER PART II {beige JOINTER attachment for the combination workshop is shown in Figs. 9, 10 and 11. As may be seen from the drawings, the base of the jointer is a 14 by 4% by 16-in. piece, and above this are screwed two “boxes” made of 1-in. stuff, 554 in. long, 434 in. wide and 3'%e6 in. high. The exact height that the boxes are made will depend, of course, on the height of the spindle of the lathe and the size of jointer head to be used. The lower parts of the jointer bed may be of soft wood, if hardwood is not available, but the jointer tables, which are fastened on top of the boxes, should be of hardwood —_— — 4 deer ps shed Caceal SAK GUIDE AX WS SS eng] OvIOE SIDE ELEVATION Ss RAs -= LATHE BED ‘ WOOD BLOCK bet TEL - ne Fic.10 | 1046

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having a smooth, even grain. The tables are 1 in. thick, beveled ‘back to accommodate the head used, as shown in the drawing, Fig. 10...The bed is. fastened to the ways of the lathe by means of a bolt and handwheel, in the same manner as the other at- tachments, and guide strips, glued and screwed to the underside of the base, locate it positively with reference to the spindle of the lathe as shown in Fig. 10. The tilting fence or guide is of hard- wood, 16 in. long and 1% in. thick, to suit the 2-in. jointer head used on the orig- inal. The fence is beveled on the lower back edge so that stock can be planed at any angle up to 45°, and is hinged to the tables in the manner shown in Figs. 9 and 10. The curved guides that support the fence and enable it to be locked in any position may be made of sheet brass or steel, %6 in. thick, either sawed out with a coping saw or cut with a chisel. When the attachment is clamped to the lathe bed, over the head, as shown by the dotted lines in Fig. 9, the outfeed or table farthest from the operator is raised about %e in. by means of a shim of heavy card- board of the same dimensions as the table. This gives the jointer a cut of Yo in., sufficient for ordinary purposes. For heavier cuts, use a heavier shim. The adjustment of the cut should be made with the head Fig. 11, a View of the Completed Jointer Attachment, Mounted on the Lathe Bed over the Headstock in place. flat on the rear table (the outfeed table) and projecting across the edges of the knives in the head. Each knife is adjusted in turn until it just touches the straight- edge when the head is turned by hand. A steel straightedge is placed Of course, the knife-edges should be square with the table tops, and firmly locked in the head before the motor is started. The head used, Fig. 12, is one supplied by a commercial house, and costs about $7. It dresses stock up to 2 in. wide and does the work very cleanly and smoothly. As to accessories for the lathe proper, the most used ones are illus- trated in Fig. 13. The spur center may be made from a combined coun- tersink and drill used in brake-lining machines in a num- ber of garages. A dull one can be had for nothing, or a new one for 25 cents. Soften it by heating to a dull red and allowing it to cool under fine ashes, then file or 1047

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— 1048 POPULAR MECHANICS Another way is to use a section of mild- steel rod that fits the tailstock spindle. The end of this piece is drilled and tapped for a No. 8-32 screw. Screw tightly in place, saw off the head, and file to a taper- ing point. A sleeve is now made of mild steel to fit over the center, the outer end being turned down to a sharp beveled edge. The sleeve is held in place with a rivet passing through it and through the other parts as shown. TAIL CENTER — TURNED FROM STEEL ROD oe wa at ps Db ll a BOLT ‘ a 2 > Uscrews SPUR CENTER MADE FROM BOLT, NUT, AND TAIL CENTER MADE FROM ROD, ona ae AND RIVET Fic .13 TAILSTOCK - mae £ WEDGE-SHAPED } ' ' 7 TO FIT CHUCK el 3s ae egal eae -- -~. «7 ROD __T0 FIT TAILSTOCK SPINDLE grind it to shape as shown. Place the shank in the lathe chuck and care- fully file the short drill point down ‘to a tapering point. The four chisel-like spurs of the center are easily filed up from the four countersink edges already on the tool. If you can, you may retem- per the center, but it stands up very well in the soft state. Another simple spur center is made up from a bolt and some screws. Saw the head off a 4%-in. bolt, so that, when a nut is screwed down on the threaded end, the bolt will rest against the face of the drill chuck. Chuck it in the lathe and file the end of the bolt down to a sharp point. Drill and tap for two No. 6-32 screws in the opposite corners of the nut, insert the screws tight, cut off the heads and file the projecting length to chisel-edged spurs. A tail center may be turned for the tailstock if you understand turning metal with hand tools in a speed lathe. Use a piece of %-in. mild-steel rod, mounted in a hole turned for it in a block of hard- wood, which, in turn, is mounted on the faceplate of the lathe. Form the center as shown in Fig. 13, and drill a spot on the shank for the setscrew of the tailstock spindle. Fig. 14 shows the form of the supports used if the lathe bed is made longer than the original specifications. The lathe and its attachments were painted with black and aluminum paint, as indicated in the various photographs accompanying this article, the wooden parts being given two coats of black enamel. The aluminum paint makes a very attractive and durable finish for the angle-iron bed of the lathe and other iron parts, as well as for the top of the tables on the sander and jointer. The inside of the angle-iron bed was painted a bright red in true small-lathe style. It must be understood that the various dimensions given for the attachments de- scribe those used on the original, and that any changes in the center height of the — ee ae ee ee a le a tii an 2 oot oe

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POPULAR lathe, etc., will necessitate corresponding changes in the dimensions of the various attachments. Overheating of Motor Caused by Water Pump It cost me more than $100 to gain the experience related here, although $2 would have paid for the remedy at the beginning of the trouble. On a long drive my auto began to overheat and it became so serious that the radiator had to be filled several times daily. In an effort to have the fault corrected, I stopped at a garage and had the carbon removed, the valves ground, the ignition checked, a large fan installed and finally an entire new radiator put on, but the trouble persisted. Going over the entire motor carefully, it was discovered that the gland on the pump had been tightened too much after the packing had worn thin, in order to stop leakage, so that it pressed against the impeller of the pump, and, instead of helping to cool the water, the pump was actually. heating it. By this time the pump was ruined, so that I had to replace it. Thereafter the cooling system functioned perfectly.— William H. Leach, Cleveland, Ohio. Running Truck with Broken Rear Axle After one of the axles had broken off inside of the rear wheel, I placed the am- bulance under the frame to support the rear end and removed the wheel. By locking the jackshaft, often referred to as the drive axle, I was able to move the truck to a repair shop with the opposite wheel for a distance of seven miles.—Oli- ver Hahn, Allentown, Pa. ie. Truck with a Broken Axle Can Be Driven to Repair Shop on Its Own Power MECHANICS Small Coil Spring Slipped over Wires Makes It Easier to Check Threads Device for Checking Threads The three-wire method of checking gauges, bolts, etc., for pitch is in general use, but it is hard to hold the three wires, the bolt and the micrometer at the same time. The difficulty can readily be over- come by slipping a small coil spring over the ends of the wires as shown in the drawing. This holds the wires on the thread securely. Grasp the bolt with the left hand and the micrometer between the ball of the right-hand thumb and the palm so that the thumb and forefinger are free to adjust it—Fred C. Wegener, Indian- apolis, Ind. Painting Imitation-Brick Joints When painting a large warehouse, sided up with tin that was pressed to resemble brick, I found it a lengthy job to cover the imitation mortar with a small brush. To do the work quicker, I glued a layer of felt from an old hat around a paper- hangers’ roller and found it quite satisfac- tory for my purpose. A small quantity of the lining color was put on a flat board and the roller pushed through a few times until the felt became well saturated with paint. After that, the roller is simply run in the depression and the paint is pressed on, causing the imitation lining to stand out in bold relief. Quite a large surface can be covered with one “rollerful” of color, and the work is neat in appearance. —C. A. Soots, North Salem, Ind.

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RRS FSR a Sr gees ae 1050 POPULAR MECHANICS tervals where hose can be connected to reach the exhaust pipes of the cars. In the case illustrated, the roof ventilator was provided with an exhaust fan, which forced the gas up through the pipe. The use of such a fan is es- sential as the monoxide gas is heavier than air and will not rise through the pipe of its own ac- cord.—E. Moutoux, Riv- erhead, N. Y. Machines Oiled at Close of the Day Start Easily in Cold Installation of Piping Connected with a Roof Ventilator to Exhaust Deadly When running ma- Carbon-Monoxide Gas from Garage Removing Monoxide Gas from Garage It is generally known that carbon-mon- oxide gas is deadly when produced in a closed garage but every year there are car owners who succumb to the fumes after having forgotten to provide sufficient ventilation. Even in large garages where ventilation is provided, running motors often produce so much of the gas that, though it may not be noticeable, it, never- theless, has harmful effects on the workers who constantly breathe it. To avoid the presence of this gas in his garage, one owner provided the arrangement shown in the illustration whereby the gas is immediately re- chinery in cold weather even hot oil, put on before starting, some- times cools in the oil passages and does not flow to the bearing surfaces until un- due friction warms them enough to soften it. To overcome this difficulty, oil the machinery immediately after shutting down at night. The bearings being slightly warm, the oil gets to the bearing suriaces, and is ready for the start next morning, when more oil can be put on if required to prevent overheating. Power Saw Cuts Disks Quickly To saw off disks from rods, or washers from tubing, on a power hacksaw, the il- lustrated method moved from the ex- haust pipe of the auto and is. con- veyed through a pipe to a roof ven- tilator, which forces it outside. This arrangement can be followed by anyone who is interested in bettering the working conditions was found highly satietsecterys. Instead of using only one blade, three blades are fitted to the saw frame, with spacers between them so that three equal pieces are cut off at once. The work can then be accom- of the garage. The pipe connected to plished in one-third of the time required the roof ventilator is run along the wall and has tees at in- Tripling the Speed of Cutting Off Disks and Washers on a Power Hacksaw when a single blade is used.—Geo. Lin- quist, Philadelphia. —™ = «> vw — «65

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WS VS ( = t| © = enor Making a Hammered- Copper Pipe Holder By DICK HUTCHINSON A RATHER novel and very useful pipe holder is the one illustrated below. It is very simple to make, will prevent the spilling of ashes over the desk or table, incidentally saving the pipe smoker from a lot of scoldings, and, if fastened perma- nently where it is most used, will eliminate many searches for that pipe that was just laid down “some place.” The only mate- rial necessary is a piece of 23-gauge soft copper, 9 in. long and 3% in. wide. Cut out a thin cardboard pattern or template to the shape and size shown in the drawing. Lay this down on the cop- per and trace around it with the point of a scribe or sharp pencil. Cut out the cop- per with a pair of tin shears and then smooth down the rough edges carefully with a file. The base, or flaring part, which is 2 in. wide at the end and 4 in. long, should now be hammered carefully with the ball end of a light ball-peen hammer. Turn the piece over and hammer the “neck” on the opposite side, also the wings; then turn the piece over again and hammer the other side of the wings up to the pointed end. The piece is turned over because, as may be seen from the drawings, that part of the neck which is on the same side of the stock as the hammered part of the base will form the underside when the holder is bent to shape. Drill two small holes, in the positions shown, for a rivet to hold the parts together. Place an old broomstick in the vise and, with the aid of the hammer, bend the neck and wings around it, then place a 40-penny nail just under the wings and bend these sharply upward, thus forming the holder for.the bowl of the pipe. Now lay the pieces across the broomstick and carefully bend the neck back on the base until the rivet holes come together. The neck and base are then riveted together with a brass escutcheon pin. To finish the job, get five cents’ worth of liver of sulphur at the drug store. Dis- solve this in a tray of water and, after washing the pipe holder thoroughly with soap and water, immerse it in the solution until it turns a reddish-brown color. Wash it off and allow it to dry, then pol- ish and lacquer it. A good make of banana oil will answer as a lacquer, if you are un- able to procure a regular metal lacquer. The oil or lacquer may be applied with a brush. BLANK FOR PIPE ft HOLDER HOLDER IN USE COMPLETED HOLDER Holder That Will — the Pipe in Upright Position and Prevent Spilling of Ashes over Desk or Table 1051

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1052 POPULAR MECHANICS Small Brush Attached to Planer Keeps the Surface of the Work Clean Brush Holder for the Planer It is well to know just how a tool is be- having on a big job, but when planing cast iron it is impossible to see clearly, owing to the cuttings which collect on the surface of the work. For this reason a hand brush is often used to clear the cut- tings away. Brushing the machined sur- _ face, however, is awkward, and sometimes involves some danger. One planer hand sawed the handle off a brush and fastened to it a length of strap iron, which he at- tached to the tool as shown in the draw- ing. With each stroke of the tool the cuttings were brushed away. Punching Holes in Sheet Metal One of the problems of a sheet-metal shop ‘is to punch clean and accurately sized holes, without excessive butr, in thin sheet metal. A hand punch is ordinarily used for work of this kind, and the punch is backed with a block of wood or lead, or occasionaliy with a block of steel, drilled with a hole corresponding in size to the diameter of the punch. The wood and lead blocks do not support the punch adequately, and an excessive burr is formed when anything but the lightest grades of sheet metal are punched. When a steel block is used, it is rather difficult to place the punch directly in line with the hole in the block. After considerable ex- perimentation with various materials, I have found that a block of “type metal” is the best material for the purpose. This is melted and molded to convenient shape and size. Burrs are kept to a minimum, and a clean, accurate hole can be made, yet the metal is comparatively soft so that the punch will not be quickly dulled.— V. C. Darby, Cedar Rapids, Iowa. Substitute for Stickers in Advertising Local Celebration In a small town, where the local print- ing shop was not equipped to print small stickers to be attached to envelopes, and where the town committee wished to pat- ronize home industry in a campaign ad- vertising a forthcoming celebration, the sticker effect was obtained by “overprint- ing” the envelopes. Envelopes already printed with the usual corner return no- tice of merchants, professional men and officials were collected. A notice of the celebration was printed in red ink, di- rectly under the return notice. This not only saved the cost of special envelopes, but enabled the merchants to profit by having their names associated with the celebration Edgar Sherman, Tucumcari, New Mexico. Tool Tray for the Lathe Bed It is always a temptation for a lathe operator to place files, calipers and other tools on the ways of the machine. If a rubber tread, such as is used on auto running boards, is laid on the ways, this practice may be followed without injury to the lathe bed. The tread is tacked to a piece of three-ply wood veneer to give it the necessary rigidity —J. Hollis Deery, Los Angeles, Calif. Rubber Tread, Tacked to Piece of Veneer, Makes Good Tool Tray for the Lathe Operator di pr ri is] fa at fe

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POPULAR MECHANICS Soldering Stainless Steel Stainless steel can be soldered without difficulty so that firm, strong joints are produced. For pickled-finish sheets, mu- riatic acid cut with zinc is used. For pol- ished sheets, it is necessary to dull the sur- face with the following solution before attempting to tin: muriatic acid, 90 parts, ferric chloride, 50 parts, and nitric acid, 3 parts, by volume. This solution should be allowed to act for from 5 to 10 min- utes, or longer if necessary, and then wiped off. Tinning is done in the usual way. After soldering, all traces of acid must be removed by washing thoroughly, as any acid left on the surface will con- tinue to attack the metal. Owing to the low thermal conductivity of the metal, it is advisabie to use a large soldering iron in order to heat the steel thoroughly. T-Handle Bolt Saves Time as Substitute for Setscrew For use on delivery cars and trucks, where storage batteries must be removed frequently for charging and overhauling, it will be found con- venient to re- place the set- screws that hold the bat- tery-box clips down tight, by T-handle Z bolts as shown in the illustration. By doing this, the need for a wrench to tighten and loosen the screws is entirely eliminated, as it can readily be done by hand. It has been found similarly advantageous also to sub- stitute T-handle bolts for setscrews on brake adjustments, tire racks, and in places where oil and grease plugs are used. TEE- HANDLE Durable Homemade Putty You can make a durable and thoroughly efficient putty by adding 1 lb. of white lead and enough boiled linseed oil to 10 Ib. of whiting to make a mixture of doughy con- sistency. Add ¥ gill of the best olive oil you can get and mix it in thoroughly.—E. J. Cutting, Marilla, N. Y. 1053 Auxiliary Ice-Box Lid, Re- sembling an Inverted Box, Saves Considerable Ice Auxiliary Lid for the Refrigerator When the iceman leaves a block of ice that is too large for the ice box, the lid of the refrigerator cannot be closed and the ice will melt very quickly. To eliminate this waste, I made an auxiliary lid to fit over the regular lid, as shown in the photo. This increased the size of the ice com- partment so that I never had to bother about the lid not closing. This lid is also handy when going away for a few days as the box can be well packed with ice. The lid shown in the illustration is hinged, but this is not essential, as an ordinary wooden box of suitable size may be used for the purpose—Harry Moore, Hamil- ton, Ontario, Can. Thumbtack Puller For loosening thumbtacks the illustrated device, which is made by cutting off the end of a can opener, will be found con- venient and quite saving on the fin- ger nails. The prongs should be bent over a little as indicated. To remove a thumb- tack insert the prongs under the head and push down on the key.— Louis Andrews; St. Louis, Mo. @Sheet brass should be inclosed in a large wrought-iron pipe, closed at one end, when being annealed.

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1054 POPULAR MECHANICS oxygen. Pressure was controlled by a regulator on a manifold to which several oxygen tanks were connected. A length of hose con- nected the steel pipe to the mani- fold. The cutting blowpipe was used to start the cut at one side, and the lance was then brought into play to carry the cut down to the bottom of the mass. Mean- while the blowpipe was moved along the line of cut at the top surface, and the lance was -then raised to pick up the blowpipe cut and again carry it to the bot- tom. This sequence of operations was continued until the cut was completed. The two pieces thus obtained were cut by the same process into smaller pieces of such size that they could be placed in the furnace and remelted. Tool for Cutting Open Pasteboard Boxes Pasteboard cartons, sealed with strips of heavy adhesive paper, Reclaiming an Eight-Foot Mass of Steel, Frozen in a Ladle, by are usually opened by means of Means of an Oxygen Lance and a Cutting Blowpipe Ladle of Frozen Steel Cut in Two with Oxygen Lance It is not generally known that the oxy- acetylene process can be used to cut masses of iron and steel of almost unlim- ited thickness. At steel mills the breaking up of salamanders and the removal of furnace spills have been long, expensive operations, but such problems are now successfully solved by the use of an oxy- gen lance in conjunction with an oxy- acetylene cutting blowpipe. The photo shows a 65-ton ladle of frozen steel, 8 ft. high, being cut to handling size. A delay in pouring, brought about by a break- down of the crane, caused this molten mass to freeze solid in the ladle. Its rec- lamation presented a real problem to the manager until he was assured that it could be handled by the oxyacetylene process. The ladle was first- broken away, expos- ing the solid mass of steel. While this was done, an oxygen lance was rigged up. It consisted merely of an 8-ft. piece of %- in. steel pipe connected to a source of knives, screwdrivers, etc., but such tools are not especially adapted to this purpose, as the narrow, sharp point is likely to be pushed too far into the box, with resulting damage to the merchan- dise. A special tool for cutting the ad- hesive strip can be made from an old Ford motor valve. Grind the end to a square point and bend it over at right an- gles as shown in the drawing. Touch the point up with a file so that it can easily tear open the paper strips. Its shape makes it impossible for the point to sud- denly slip too far into the box. Nor is it easily lost for, when not in use, it is set on the flat end so that it can be easily seen.—Frank W.*Bentley, Jr., Missouri Valley, Iowa. @Soapy water, applied over joints in gas or pressure pipes, will locate leaks. = ~ _

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4 iced coat a . Wi di gh “i ae WR Ty “. wy 1 TAN . COPYRIGHT POPULAR MECHANICS MAGAZINE "YY oe PLAN 5-S-21 . =~ me ee ee ee a a = a Ww LD beasts, rain, a torrid sun, ene- the style of their masters, so that today, mies waiting to pillage and kill, zero weather are some of the hazards man has had to protect himself against as a home owner. The necessity for defense and self-preservation not only influenced the plan and style of primitive houses, but when you survey the history of home building, it is surprising to note how many of the early methods of defense have been carried down into our present-day archi- tecture as style features. From one end of Europe to the other you'll find hundreds of castles built with round towers. A tower at each corner of the chateau, two more flanking a moat and smaller towers at convenient places where yeomen could defend their lord and lady by pouring molten metal on attack- ing enemies. Towers were always a part of a castle plan. In later and more peace- ful years, the tower was retained as a vital part of the seigneur’s chateau, not for de- fensive purposes, but because it added a note of distinction. During the great war, many American doughboys sought refuge from shrapnel and shell in a Nor- when we speak of Normandy, we auto- matically think of tower houses. Usually the early towers contained cir- cular stairways from one floor to another. Even today American houses patterned after the Normandy tower idea feature circular stairways; but aside from this cir- cular stairway, the tower itself introduces a highly decorative feature into modern house design. Porches, dormer windows, streamlines, slip-fast roofs have done much to relieve American houses of what otherwise might prove a monotonous ap- pearance when four plain walls and roof are erected for shelter. It is this relief of monotony that makes the Norman tower so valuable architec- turally. A well-designed Norman house simply cannot look commonplace, monot- onous, or “just another house.” By intro- ducing a tower into modern small-house designs, you bring a curved surface into contrast with the vertical and horizontal sidewalls, and this combination adds in- terest and variety to the exterior. Normandy tower houses are grow- ing in popularity mandy tower or with American others like it. Popular Mechanics Magazine will supply readers home builders. We ° . a one-sheet blueprint of any house appearing in ' lad | Smaller houses of the magazine for $1. are glad to show peasants followed you a new tower- 1055

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1056 | pcm WWQBOAAK NN if f ¥ DINING RM: : ~ N-O8n-oO KITCHEN \ + Sap ae ‘Sa Bro ®n- o || Living Rm: ‘nligttiantid : 75 419-9 g 12-5 * FT 5-s-2 ‘o a “ | ” FiRst 3 Ss 1 1 nove Pian BU] SAX POPULAR MECHANICS ital ee | - 1 , : STORAGE N H , \ ~ a eaeoee 1 \ cL HALL \ | “| - 4 ‘ BED Rm BED RM: \ 13-5 512-0 10-9 5 12-0 R tl GOW? yyy) S ti tH}. j Jy SECOND FLOOR PLAN ee type design this month, prepared espe- cially for Popular Mechanics readers. This is a small house nestling close to the ‘ground. In fact, so small that a circular stairway is not practical, although the tower is none the less useful for storage purposes. The house is planned for a forty-foot lot. It would look well on a corner lot. Construction is frame with stucco on metal lath, or tile with stucco, or white- washed brick. There is a full basement and complete insulation. The plan calls for five rooms on the first floor, or complete bungalow equipment. On the second floor are two more bed- rooms, abundance of closet space and two exceptionally large storage rooms. The gable ends of the house are of wide siding or shingle in natural brown finish. The half timber on the tower shows a small overhang, supported by brackets or corbels. Casement windows throughout carry out the spirit of Normandy style, and a heavy beamed ceiling in the living and dining rooms maintains an old-world tradition. The fireplace is built of fieldstone with a heavy beam for a mantel. The roof may be asbestos shingle, slate or cedar shakes. Y SS There is everything in this house aver- age folks require in the way of sound construction, style, and modern equip- ment, all at prices within the capacity of the average pocketbook. The designer says $6,000 should build this- house under -nor- mal conditions. Prices vary, depending upon location, however. Under any. con- dition, this house offers large value at moderate cost. It is a plan, too, that lends itself to later enlargement, when the needs of a grow- ing family demand more space. Without destroying the charm of the house, the rear roof can be raised and the second- floor storage space turned into one very large or two small bedrooms; or, as an alternative, the kitchen water pipes and sewer connections can be extended up- stairs and one end of the storage space turned ipto a second bathroom and the other used as a bedroom, serving room or playroom. PLAN BOOK FOR READERS A NEW BUNGALOW BOOK: Sixteen se- lected low-cost bungalows in popular styles, at prices ranging from $5,000 down to $2,000. Each house fully described and illustrated. Send ten cents in stamps to cover mailing.

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POPULAR MECHANICS ADVERTISING SECTION Wuar MAKES -_ IT TICK? —_ The boy takes his birthday watch apart to see what makes it tick. The man listens to the tick of the uranium electrons discharged into space—he actually hears the atoms of the metal disintegrate. HE spirit is the same—the T spirit of pure science. For thirty years General Electric has encouraged this spirit— this keen play of scientists just beyond the border of the known—by one of the larg- est annual subsidies devoted to the pursuit of pure knowledge. Both for you and for Gen- eral Electric this policy has proved to be a practical, profit- able investment. For example, the present G-E Mazpa lamp Years of purely scientific inves- tigation preceded this invention. And to-day, it saves the American people about a billion dollars a year 1n lighting bills. The history of General Electric research is, in fact, crowded with such practical contributions to the comfort, health, and prosperity of us all, yet most of them owe their origin to the purely scientific curiosity which is the real dynamo of Gen- eral Electric accomplishment. Because General Electric has pioneered this policy, and maintains it on a steadily increas- ing scale, the G-E monogram on any electric product—whether it is the little motor that runs your sewing machine or the turbines that drive the newest liners out to sea—is your assurance of electrical correctness and dependability. JOIN US IN THE GENERAL ELECTRIC HOUR, BROADCAST EVERY SATURDAY AT 9 P.M., E.S.T. ON A NATION-WIDE N.B.C,. NETWORK GENERAL ELECTRIC

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POPULAR MECHANICS ADVERTISING SECTION 800,000 ADDITIONAL TELEPHONES ARE GOING INTO USE THIS YEAR A million and a half dollars a day An Advertisement of the American Telephone and Telegraph Company GTR Ty More than 200 new Bell tele- & phone buildings are goingup this year in the United States, 800,000 additional telephones are going into use and new switchboards to care for 3,000,000 additional calls a day. Thousands of miles of new cable, millions of miles of wire, new carrier systems, vacuum tubes and loading coils. These are a few of the things in the 1929 construction and improvement program of the Bell System which will cost more than 550 million dollars—a million and a half a day. Telephone growth is essential to the new American civilization of better opportunity for the average man. The fo as 6) Bell System employs more than 400,000 workers, is owned by 450,000 ager pewyees and serves the people of the nation. Every day the Bell System is extend- ing its lines to more people, i increasing the speed and accuracy of its service, giving greater comfort and con- venience in telephone use. All of this is done that each individual may get the most from this means of all inclu- sive and instantaneous communication and that the nation may be one neighborhood. This is part of the tele- hone ideal that anyone, anywhere, shall Ss able to talk quickly and at reasonable cost with anyone, anywhere else. There is no standing still in the Bell System.

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POPULAR MECHANICS ADVERTISING SECTION 5 DRAKE'S wecianicar BOOKS THEY WILL RAISE YOUR PAY— ORDER ON 5-DAY TRIAL The books listed below will perfect you in your chosen trade— pave the way to the big positions. Written in non-technical language—easy to read and understand. . Every book covers ~ subject completely. An entire course of instruc- tion condensed into one volume. Your choice sent page vee benefit 5 days—money ~ 4.~} in full if not entirely satisfactory. Order direct from this page. RSS MODERN bs a a. ° ° | Aviation and Auto Books Painting and Decorating Modern Iilustrati 3.50 Aviation From the Ground Up.... $3.50 Carpentry Books The Lacquer System of Sign Paint- * Automobile Starting, Lighting and i in: sremabeith dens cadens Cloth $3.00 ignition. by Manly. -. 700 pp. $3.90 Cloth Binding Brookes’ Automobile land book . $2.00 | Mod xe Carpentry, 3 a ° Ford Motor Car, Truck and T: The Steel Ho ow to Draw Funny Sih a y Manly. bnticey “Gai -Cloth $1.50 Heodere Es mater. Complete Course in ¢ sree Chol Auto “ama Radio Battery, Care and __| Timber Framing............+--++ 32-00 | oo cee otl Repair, by Manly. "Leatherette $2.00 | Builders’ Architecturai Drawing... $2.00 Layouts for Advertising... ||. Le Motoreyele andbook, by Manly.. $1.50 | Concretes...........sceceeeeeees $1.50 urniture, Deratters} Finishing: Dec- Practical Bungalows...........-- $1.00 rome and Patching....... x Roof Framing, by Van Gaasbeek.. $2.50 | Ross Crane Book of Home Furnish- ng Clot House Painting Methods. A Interior Wall Decoration, b: Gerwalker........... Leat a... The Mixing of Colors and Paints, by Vanderwalker......... Cloth — Handbook—Letter and De- A Show at Sho’ Cards. .Cloth Sign Painting, a, Atkinson. . Cloth Strong’s Book of Designs, Leatherette odern Painters’ Cyclopedia Cloth Automobile Painting...... Cloth Wood Finishing, Plain and Deco- SOs 00s cecceseoctveses Cloth $2.00 Steam Enginesring omens = = gy for Steam Engineers jans . Leatherette. $4.00 manstangion © Questions and Ap- svvers for Marine and Stationary e 5 bheephecene aoe $3.88 ; team Boilers......... eatherette $2. Shop Practice Books | . Ti Sa eS ay G Practical Heating Systems, Trouble | ectrical Engineering. . . Jobs and Ventilation........... $4.00 4 4 Ren 6 lll ew bobasenensoucivs Leatherette $1.50 Sheet Metal Workers’ Manual...._ $2.00 Drake’s Radio Cyclopedia Modern I a * Acetylene Welding my Cut- $1.25 By H. P. Manly Prof. P. S. Allen, U. of Ch By a¢ oth French without a Teacher....C joth Sh. 25 Slide Ruie and Logarithmic Tables. $2.00 | 920 Pages, 1025Tllustrations, 1700Subjects pan 1. Handbook for Mil iliwrights. . .Cloth $2.00 | arranged alphabetically. For Service an Spanish without a Teacher...Cloth $1.25 -Cloth $1.2 eee Lee Prac : —- = bs Cl = $2.00 + hy d ) a exper. Everyday. , 4 ¥ Teacher. . o60e6 ES : $1. 33 rawin: ns achine Designers. § i eeée . gD........- Seateoadl Cloth $2.00 | Buckram. Price..-.........-.. ~2.-$6.00 | Everyday Spanish.......... — $1.25 eer DIRECT FROM THIS PAGE si = ON OUR MONEY-BACK PLAN — -_ —— aah. The books listed above are only a few of the many in our ERIC cK 3 Jj. DRAKE catalogue, which you will receive promptly after filling out FRED) Avenue and mailing us the attached coupon. For qu ick action order No. Michigan direct from this page—cross name of each book wanted and a R508— 179 i OY TT oe crevey postage and send the pono — . nt Pt os, _posta, op sackioal FREDERICK J.DRAKE & CO. \ gazes Publishers Fe hada R508—179 No. Michigan Ave. CHICAGO pay renne #0 .-snscssnsesonneronsreen® Drake Books Are For Sale at All Book Stores . eoceseeere oe000eeeeoeee® oeeeere Mail Coupon For Free Catalogue eoee coooeeee® Your Guide to Home Study suaseasssrssenenscs

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6 POPULAR MECHANICS ADVERTISING SECTION a HEN my ship comes in,’’ you say—but your smile cannot hide the worry gnaw- ing at your heart— A fine i, | vessel you had thought that ship of yours when you launched it on the business ocean— Yet the days and months and years slip by —and though others see their ships ride triumphantly to harbor, still you scan the horizon anxiously for a ship that never quite makes port. No one’s fault, perhaps — but what a misfortune that so many business ships should founder on a hidden reef or a treacherous shoal, when the chan- nels to Success are plainly charted and a chart for every channel ts available to every thinking man! How the Right “Chart” Increased E. T. Orcutt’s Income 500% Certainly my _ship-of-fortune seems far off its course, said E. T. Orcutt, in effect, when as rail- road clerk at $20 a week he enrolled with LaSalle for home-study training in Traffic Management. Before he had completed the training, however, came an opportunity with Hitchings & Co., Eliza- beth, N. J., one of the largest manufacturers of greenhouses in the world. Training had set his ‘‘ship’’ on the right course. Later, as sales manager, he kept on training with LaSalle—in Business Management. Since taking his first course, his ‘salary has in- creased more than 500 per cent. Recently he has organized his own company, capitalized at $100,000, of which he is president. How G. W. Clason Placed His “Ship” on the Right Course No bands were playing when G. W. Clason launched his ‘‘ship’’ on the business ocean. Clason had left school at 14, and at 19 his job was to take care of the horses in the barn of a laundry. **Never mind,’’ said G. W. Clason, “/'7 make my opportunity right where I am!"’ So he learned the laundry business, and at 28 was operating his own plant: When fire wiped his business out, he started again. Unable to finance properly — through lack of business understanding, as he testifies—he sold out and became superin- tendent of the Ideal Laundry Company, Spokane. whose ship never quile comes in Right then he made up his mind to remedy his lack—and enrolled with LaSalle for training in Business Management. Today, at 47, he is vice-president and a director of this successful company, and commands an income several times as large as when he started with LaSalle five years ago. “*T give all credit to my LaSalle training,” writes Mr. Clason. ‘‘It has proved by far the most profit- able investment I ever made.’ No More Drifting! Send for These Free Books —Today Are you letting your ship-of-fortune drift where it will—or are you charting its course to the Harbor of Success? : There’s a route that will take it straight to its destination, LaSalle can help you find it. Without cost or obligation, the coupon will bring you a special 64-page klet fully describing the opportunities in the business field that most appeals to you, and showing you how you can fit yourself to grasp them. : : As you value your future—fill in, clip and mail the coupon NOW! —-— — — Find Yourself Through LaSalle! — -—— -—— = LaSalle Extension University The World’s Largest Business Training Institution Dept. 1264-R Chicago I would welcome an outline of the LaSalle plan, together with a copy of ““Ten Years’ Promotion in One,” all without obligation. Banking and Finance A, emen' Oo O Law: Degree of LL.B. 5 F P O Commercial O Personnel Management O Industrial Management O Expert Bookkeeping Modern Business Corre- D Business English 5 pam mi 0 Commercial Spanish 0 Credit and Collection O Effective Speaking Correspondence 0 C. P. A. Coaching O Telegraphy D Stenotypy—Stenography Name Present Position... TASS aD sical SOF He >5 1 Oe ae cee See,

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or in es it- elf ail POPULAR MECHANICS ADVERTISING SECTION 7 What Every ELECTRICIAN Wants to Know [JUST OUT! — Latest Exact Information from A to Z!| is > We take in announcing: “AUDELS NEW ELECTRIC LIBRARY” New and More Uses for Electricity that come up daily offer great opportuni- hs ties to men who can handle this power correctly and accurately. Modern electri- Vag YAN I i fication of industry calls for teniacd men who know how to handle electricity. he Ul N ull } Simple as A.B.C.—“Audels New ElectricLibrary” gives latest,exact information -_, anil) from foundations of electrical practice to latest modern applications. This is a NEW ee : practical and theoretical course in electricity for home study and ready reference. Here are the answers to your questions, giving you the real dope that every electrician must know. They chart your knowledge, taking away the uncertainty of guess work. >= Beautiful, timely books for service AA , | —pocketsize; completely illustrated Z e withdiagramsandcharts; simplified, > easy to read and understand. No = electrical man can afford to pass up : - this opportunity. Extremely low price; buy onyourownterms. rouble Shooting, Tests and Test- ing Instruments, Storage Battery, Construction and Repairs, Alter- nating Current Principles & Dia- ams, Power Factor, Alternators, ransformers, A-C Motors, Wind- ings, Reconnecting, Converters, Switches & Fuses, Circuit Breakers, Relays, Condensers, Regulators, Rectifiers, Meters, Switchboards, Power Station Practice, House, ae voor Wiring, Circuits, igh Tension, Transmission, Plans, Calculations, Code, Electric Rail- \ ways, Signals, Elevators, Hoists & Cranes, ine, Auto & Aero %, Ignition,Starters, patio, Teleghene, if Bells & Si lotion Pictures, Talkies, Lighting, [llumi- : A 4 nation, Electric Refrigeration, | The Library contains 12 books Heating, X-Ray, Plating, Welding, | —the first 7 books containin Pumps, Compressors, Domestic & | 3600 pages with thousands of dia- Farm Appliances, An ElectricCal- | grams and illustrations are now culator for Engineers & Mechanics, | ready; the remaining 5 booksare in Practical Mathematics for Ready | preparation. A pocket-size, flex- Reference, A New Electric Die- | ibly bound series that is valuable tionary & Encyclopedia of Words. | wherever electricity is used. GUARANTEED “*Audels New Electric Library” is backed by our 50-year record as helping hand publishers. Satis- faction always guaranteed. Bu — es ee ee WNT ‘ PLAN 1—ONE BOOK A MO Please enter my subscription to ‘‘ Audels New Electric Library”’ to consist of twelve volumes, price $1.50 a volume ($10.50 for the seven volumes now ready). Mail one volume each month and as they are re- | ceived, I will mail you $1.50 promptly. je PLAN 2—PAY 50c OR MORE A K lease ship me for one week’s free trial the first seven volumes of “* Audels New Electric Library,” $1.50 each ($10.50 for the seven vol- Jomes now ready). er ing five vol be mailed as issued at $1.50 volume. If satisfied, 1 will mail you 50c or more each week as | payment for the first seven books and I will pay for the last five num- rs as I receive them at $1.50 each. _] PLAN 3—CASH PRICE $9.98 | Please ship me postpaid “‘ Audels New Electric Library’’ for which I ] encloseremittance$9.98in full payment for the seven volumesnow ready. ‘ou are toship meon one week’s trial the r five as they are issued for which I will either pay $1.50 each as received or return vo you. This price is based on 5% cash discount. THEO. AUDEL & CO., 65 West 23rd St., New York, N. Y. Please sh ip me the NEW “Audels Electric Library” on the plan marked (X). NAME ..... ADDRESS | annceceseees] 2T3O

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3 POPULAR MECHANICS ADVERTISING SECTION UP TO $100 a Week Say good-bye to low pay. Get into the Auto Business, where big pay—extra money—raises come quick! A brilliant future awaits you in the World’s Big- est Business. If you’re earn- ing a cent less than $60 a week, clip that coupon. Learn how $50—$75—even $100 a week is possible for you now! Find out about this creieias which boosted Yancy of Perla, Ark., from $30 a week up to $90! Open Your Own AUTO SHOP My Free Book tells how men make extra money while train- ing, and then go into business with no further Capital. It’s the Training that counts, and it is complete training that I give you. Common Schooling all you need Men between 15 and 60, with very little education, are be- coming Garage owners, Super- intendents, Foremen. Whether you have had years of Auto Experience, or never touched a car before, send for this FREE Book Now. I'll show you the quick way to get in line for real success in the Auto Business. Aviation Outfits © FREE extr. MAIL THIS COUPON urse 4 cost: B. W. COOKE, Directing uenea FR MOTOR INSTITUTE OF AMERICA Dept. 2169 Evanston, tiinels Auto Send me your Book, “Auto Facts,” Free of charge ape Also full particulars of “JOB-WAY" Training and of your working outfits and Aviation Course offer. This obligates me in no way whatever. eeeeeeeee B. W. Cooke Directing Engineer rd Send coupon for Free Auto Book. See how I train you a at home, in every branch Auto work—Learn, how I prepare you, quickly and easily, for the Big Jobs, paying up to $100 a week and more. **Job- Way” Training includes all Mechanical and Electrical work —Starting, Lighting, Ignition —also Welding, Brazing, Vul- canizing—everything you need to get in line for a big pay Job as an Electrical and Mechan- ical Auto Expert. ru Help You Get a Good Job My Employment Department will help you get a good Job whenever you want one. You don’t have to wait until you have graduated to use this service. No sir, as soon as you have shown that you know enough about Autos to hold the Job I'll give you this help when- ever you ask for it! What is more, you can use it as long as you live! Get All The Facts! Send for my new Free Book now! See what “Job-Way”’ has done for hundreds. See what it can do for you. Learn all about my legal money-back agreement—and the many added features. Clip coupon now! B. W. COOKE DIRECTING ENGINEER Dept. 2169 Motor Institute of America [Formerly Chicago Motor Training Corp.| Motor Institute Bldg. EVANSTON - - - ILLINOIS 4 re re rr rr re re ee eee ee ee ee ee ee ee ee ee ee

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rb t will never have uated , soon know i the when- more, | live! ts! now! ne for io for legal i the pupon cE erica arp. le NOIS POPULAR MECHANICS ADVERTISING SECTION “The Happiest Day of My Life!” | | | ! | | | | | | | | | | | | | | | . “OUR WEDDING DAY! A year ago it seemed like a dream that would never come true, for my salary then was barely enough for one to live on. I faced the facts. Unless I could make more money I had no right to keep Ruth waiting. I must find out how to make myself worth more. “It was Ruth herself who showed me the way. She clipped a coupon out of a magazine and we sent it to the International Correspondence Schools for information about their courses. Within a week I had enrolled. The training I got from studying at home showed up almost at once in my office work. They gave me more re- sponsibilities. Inside of six months I was promoted, with a substantial raise. Now I’m getting double what I was a year ago— and we're married!” Employers everywhere are on the watch for men who want to get ahead, and are willing to prove it by training themselves to do some one thing well. I. C. $. Courses have given thousands the special knowledge they need to win better jobs and bigger pay. Why not you? One hour of spare time a day, spent in I, C. S. study, will prepare you for the posi- tion you want, in the work you like best. Find out how. It won’t obligate you in the least to ask for full particulars. Do it now —for HER! Mail the Coupon for Free Booklet eee ee a a ee eee eT rreerrernme—crcr CO Tr rere er oe - INTERNATIONAL CORRESPONDENCE SCHOOLS, Box 5652-F, Scranton, Penna. The Universal University” part, please send me a eopy of your 48-page booklet, “Who Wins and Why,” and tell me BUSINESS TRAINING COURSES Business Correspondence Show Card and Stenography and Typing English _}) Tilustrating Civil Service TECHNICAL AND INDUSTRIAL COURSES Aviation Engines Plumber and Steam Fitter Plumbing Inspector } Foreman Plum Heating and Ventilation Sheet-Metal Worker | Steam Engineer ‘| Marine Engineer L a ee Engineer Highway Engineer Chemistry Ne am } Mail Carrier | Grade School Subjects C) High Sehool Subjects C) Cartooning E Railway Mail Clerk Sign Lettering Lumber Dealer Pharmacy Mining Engineer Navigation [) Assayer Iron and Steel Worker “) Textile Overseer or Supt. Cotton Manufacturing : Woolen Manufacturing ) Poultry Farming C) Mathematics (J Radio R. Positions Without cost or obligation on my how I ean qualify for the position, or in the subject, before which I have marked an X: Business Management [) Cost Accounting Industrial Management ) Bookkeeping Personne! Management } Secretarial Work () Traffic Management }Spanish [() French J Accounting and }] Salesmanship C.P.A. Coaching { j Advertising Architect C) ‘Telegraph Engineer Architectural Draftsman 4 Telephone Work Building Foreman j Mechanical Engineer (J Concrete Builder Mechanical Draftsman Contractor and Builder "] Machine Shop Practice Structural Draftsman |) Toolmaker () Structural Engineer J Patternmaker (j Electrical Engineer } Civil Engineer Electrica] Contractor Surveying and Mapping Electric Wiring |} Bridge Engineer Electric Lighting |) Gas Engine Operating Electric Car Running oO Automobile Work SE ctiinincchiltinaittinhignitetninttilansitine ici liiaacaaciiiecuiiiinpieininilatine ee State If you reside in Cenade, por ‘this coupon to the Internetionst. C Sorokmeeill nce Schools Canadian, Limited, Occupation _ one Canada "Mentre al, | | | | | | | | ! I I | | | | | | | 4

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10 POPULAR MECHANICS ADVERTISING SECTION of the AQ Easy Ways HE four plans shown are but a ‘ sample of the many Z, 1/) ways in which our mem- bers are making $3.00 an hour upwards, spare time and full time, from the day they join the Association. If you want to get into Radio, have a business of your own, make $50 to $75 weekly in your spare time, investigate the opportunities offered the inexper- ienced, ambitious man by the Association. Our Members Earning Thousands of Dollars The Association was Weekly formed to help men cash in on Radio. It makes past ex- perience unnecessary. As a member of the Association you are trained in a quick, easy, practical way to install, service, repair, build and rebuild sets—given sure-fire money- making plans developed by us— helped to secure a position by our Employment Department. You earn while you learn, while you prepare yourself for a big-pay Radio position. The Association will enable you to 4 buy parts at wholesale, startin busi- i ness without capital, help you get your share of the $600,000,000 spent annually for Radio. As a result o the Association, men ‘all over the country are opening stores, increas- : ing their pay, pass- ing licensed opera- tor examinations, landing big-pay positions with Radio makers. Mail Coupon for the FREE HANDBOOK It is not only chock-full of absorbing information about Radio, but it shows you how easily you can increase your income in your spare time. Mailing the coupon can mean $50 to $75 a week more for you. Radio Training Association of America 4513 Ravenswood Avenue Dept. PM-12 Chicago, Illinois IMPROVE, TONE ANT , ¥ Ve Eelivial® mele BEY SELECTRiry “ALGRAPHS In Your Spare Time RADIO Below | are a few re- ports from those | cashing in on the | “easy ways” & Clears Frank J. Deutch, Pa—"Since : inin e Association ve F $3,000.00 clea nearly $3,000.00. It is | 7 almost impossible for a young fellow to | fail, no matter how little education he has, | if he will follow your easy ways of making | | money.” | $1,100.00 in J. R. Allen, Calif.—“Have done over $1,100.00 worth of [> 6 Weeks business in the last 6 weeks. | Next month I am going to open up a store [| of my own. I never knew that money [7 could come so fast and easy.” o $25.00 a Week N. J. Friedrich, N. Y= . Spare Time ave avera uJ 4 a week for the last 7 months even though I am not a graduate but just learning. Lands z. Cc. Kirk, N. C= our inin as Him Job been very velenie to me. I landed a job with the big department store out here a few w were a large bunch of applications ahead of me.” ACT NOW) If You Wish NO-COST } Membership ‘ For a limited time we will give to the 8 ambitious man a No-Cost Member- |) ship which need not —should not— |} cost you a cent. For the sake of |j making more money now, and | having a better position in the future, mail coupon below now. F Seesees ee ane “2 eeease neces ts Radio Training Association of America Dept. PM-12 4513 Ravenswood Ave.,Chicago Gentlemen: Please send me by return mail full details of your Special N. it Member- ship Plan, and al: i ~Fied so a copy of your Radio ( ae

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Swe ww wesw Vey Qoneor

POPULAR MECHANICS ADVERTISING SECTION 11

500,000 VOLTS “ Artificial lightning” be- ing developed in COYNE School. Spark of 500,000 volts is shown jumping 30 inches. This gigantic Tesla coil is the same as that used by Steinmetz, absolutely harmless, be- cause of high frequency. LEARN ELECTRICITY

Without Books or Lessons in IZ, Weeks.

m Actual Work - In the GREAT SHOPS of COYNE Anyone who can see and under- stand the English language can learn Electricity in 90 days. I teach you with as complete an outlay of electrical apparatus as was ever assembled in any school —30 foot control board—2-story transmitting stations — skeleton houses, huge motors of all kinds —dynamos—sub-stations —auto- mobiles—switchboards. Inonedepartment we gen- erate enough electricity to supply a small city! No Books ~ No Lessons~ No Classes ENTER ANYTIME. Experts teach you without books or classes. They guide you every step of the way with individual attention. You do the actual work on real full-size machinery in full operation. Take motors forinstance. Instead of learning from books and charts—you actually build motors. You can’t help but know all about them. Anyone can learn fascinating way. No Experience Necessary That's how ss make men learn electricity in 12 won- derful weeks. You don’t need ex ience—Co; ne training starts from the bay 4 beginning. You don’t need advanced education —you learn by Going. Age is no handicap—Coyne students range from 16 to 40 Triple Your Earning Power I don’t need to tell you about the opportunities in Electricity. They are too many and too amazing to mention. Ordinary “= run from $50—$75—$150 a week, And Coyne training the biggest positions. ELECTRICAL COYNE scHoo. H. C. LEWIS, President - ESTABLISHED 1899

500 S. Paulina St., Dept.99-72, Chicago Many Coyne men are making up to $600 a month. Demand for Coyne men often exceeds the supply. Our Employment Bureau helps you secure position. EARN WHILE YOU LEARN We help many students to secure part-time jobs to earn a good part of living expenses while learning. RAILROAD FARE to Chicago Allowed Right now I am including railroad fare to Chi- cago and comets courses in Radio, Aviation, and Automotive Electricity without extra charge. All Details Sent Free This school is 30 yearsold—Coyne training is tested —proven beyond all doubt —endorsed by electrical industry. You can find out every- thing absolutely free. Simply mail the coupon and let mesend you the big, free Coyne book of 150 photographs—facts— jo’ jes—opportunities. Seewhat Coyne training can do for you in just $0 days! This does not ae ate —— So act at once. Just mail Get this Free Book

H. C. LEWIS, | COYNE Some, Bape Cote ays <element Dear Mr. Lewi Without obligation om me vesr b bi, of Railroad Fare Avision and Automotive. w many ‘earn w free catalog and all details ployment Service, Radio Electrica Courses you are including SOR EEE EEE EEE HEHEHE EEE EH EEE Fy s i

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12 POPULAR MECHANICS ADVERTISING SECTION How Fred Fisher Makes*30 aWeek in Spare Time with his “Had no idea it was 80 easy! Nobody could go wrong with your clear, sure method. I now have morefriends and never missany parties. I have been earning $30 a week in spare-time. There's always a job for a Tenor Banjo- ist.’’—Fred Fisher; 123 Ridge Street, Steelton, Pa. eee mB Big Spare-Time Money Why “wish” for friends, fun and ready cash when have them—quic Brantford, tested, easy system will Ont., (shown teach you—in 1 to3 above ites: months—to make “Was only $5 to $15 an juarter-way evening spare- hrough Course when Banjo is the sure, easy way to Big Money. My about ‘‘The Tenor Banjo 550 Banjo. Play-Way to Owe success Popularity fo you.”’ and Big Pay. FREE BOOK tells how This inspiring book—that oe shown countless others short-cut to SUCCESS —will show you how to friends, popularity an you wapt—QUICK! ation. Get tne facts about the ascinating method that taught Fisher and Samwell SH ot Tenor Banjoists. No k or notes necessary. No onteas to buy. We teach See lasan— ore you ip and mail cou- The same day we receive your en- roliment for Course rofessional-size Tenor anjo worth $20— lessons, Complete Out- fit—and correct, fool- Re oof demonstration ‘honotraph of every selection ip the Course! . F. Bloch, President. New York Academy of Music, Studio 1129, 100 Fifth Ave., New York City Dear Mr. Bloch: Please rush me your FREE Book telling a how I too can make a Quick Success and Big Money withthe Tenor Banjo. 4 1 i i | eee 7 he Addrers S| THE CHICAGO DAILY NEWS School and College Bureau Offers You Its Specialized Services in Choosing a School Last year the School and College Bureau of The Chicago Daily News saved many busy parents and questioning boys and girls both time and worry by sending them prompt, reliable information about just the kind of school they wanted— personal requirements as to location and tuition charges being considered in each individual case. Again this year many young people will be perplexed by the problem of finding the right school. Why not let us help you? The. Chicago Daily News maintains this service absolutely free of charge to you. No need to hurriedly select a school on mere hearsay when expert advice can be obtained by telephoning Dearborn 1111, writing or calling for a personal interview at THE CHICAGO DAILY NEWS School and College Bureau Dept.K, Daily News Plaza, 400 W. Madison St., Chicago, Ill. Electrical Engineering Course for men of ambition Students construct motors, in- and limited time. Over 5000 stall | wiring, test electrical men trained. Cond d y. Course designed to course in Theoretical be completed in one and Practical Elec- college year. Prepare trical Engineering in- for your profession in eluding the closely the most interesting related subjects of city in world. Mathematics and Est. 1893. Catalog Mechanical Drawing. on request. Bliss Electrical School 122 Takoma Ave., Washington, D. C. Learn Watchwork, Jewelrywork and Engraving A fine trade commanding a good ye and your services alwaysin demand. Address Horologica Dept P, Bradley Institute, PEORIA. ILLINOIS, for our latest catalog. Travel On “Uncle Sam’s” Pay Roll $1900to Railway Postal Clerks SZTZOO LT Freniiin instars, dept. 010 3° o 780, R Rochester, ? N. LY. Sire: Rush to me without artes a) 32 page book A YEAR describing Revenant jobs, (2) List of many U. 8. $ —s jobs now obtainable. (Tell me how to get t. * Men—18 1035.5 sium 7 Address . Mail Coupon Today Sure str sta’ fau dia to WE ow! wis car the bool Pay! ship as n grap unti mor

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escki wm ii = 7:4 ww rk ding vices adley POPULAR MECHANICS ADVERTISING SECTION 13 —Sae ee Sse SS Sees Repair any auto fault, learn how now. You can do it easily in this new simple way. These five big automobile books are the most interesting, the most practical books we have ever published on automobile con- struction, operation and repairs. Brimful of facts, photographs and explanations so easy to under- stand that anyone can learn how to repair auto faults in almost no time. Over 2,000 pages full of diagrams, data sheets and everything else needed to make anyone an authority on automobiles. Whether you want to qualify as garage All Shipped pon miss a word of our free shipment offer. —we ship without receiving one penny. a JIFFY INDEX in These Five New Big Auto Books Makes All Facts Instantly Available. Find Anything You Want To Know in a Moment in This Latest Edition Free Learn All About Autos Get these five big books on this liberal offer and learn all the things you want to know about autos —carburetors, engines, springs and spring suspen- sion, brakes, 4-wheel drive, lubricating system—all are fully covered. These complete and comprehen- sive books are yours if you want them on this easy plan. Send for a set now. Fill in the coupon. You don’t have to pay us a cent owner, auto repair expert or merely FIND FACTS QUICKLY One of the best things about these money making wish to know how to keep your own car 100% efficient, you will recognize the amazing value of these five big books, especially on our No Money Offer A very liberal plan of distribution brings these books to you for examination without one cent of REPAIR ANY AUTO FAULT With these books you don't have to worry about autotroubles. Illustrations are so clear and explana- tions are so simple that anyone can jerstand them. All phases of auto- mobile engineering fully covered. Engines, chassis, carburetors, ignition sys- tems, transmissions, dif- books is the Jiffy Index, which puts vital facts at your finger tips. You don't have to read the books through; you don't have to spend long hours over them. This Index enables you to put your finger on the information wanted in a jiffy. DON’T HESITATE There are no strings to this offer—it means just what it says. Send name and address on the coupon and all of the five big books—the complete set—will sent you for examination. Remember, one fact alone which you can find in these books may save you an expensive repair, or help you to a better job. Payment to us. We don’t ask a cent of you, but ferentials—in fact every ship the books free. Look them over, read them part a modern auto- FOR FREE OFFER USE COUPON as ——y. ~ = want i the splendid photo- mobile explained from the graphs an rawings, and then if you decide you standpoint of theory and want them, send only $2.00 and then $3.00 a month practice. = American Technical Society, Dept. A919 until only $24.80 is paid. That is all. Nothing Drexel Ave. at 58th St., Chicago, Ill. more to pay us. There ts no further obligation. American Technical Society Membership Free Yes, we include a certificate of membership in the American Techni- cal Society, which entitles you to free consultation on any subject relating to automobile engineering. We have over a million dollars of resources enabling us to get co-operation of the largest auto- mobile manufacturers and dealers who have furnished us plans and photographs. This membership, which you get for an entire year free, entitles you to consultation with 18 automobile experts, any of whom will be ready to help you at all times. You can write or wire any time for special information. Answers will be sent Promptly without cost. I would like to look at the five big auto books—send them on our free offer. will pay the few cents delivery charges. If like them, I will send you $2.00 when I have had the books fifteen days, and then $3.00 a month until the special price of only $24.80 is paid. Otherwise I will return the books at your expense. You are to include, without charge, free consulting membership certificate in the American Technical Society. NET © DUNN: 0.0.0 0 60 0e00s Ge cceeeeseccescceececeneeese ILLS 58. nn ccd enceenesseuee

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POPULAR MECHANICS ADVERTISING SECTION EARLE LIEDERMAN, The Muscle Builder Author of “Science of Wrestling,” ‘Muscle Building,” “‘Secrets of Strength,” “‘Here’s Health,’ “‘Endurance,”’ etc.

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etc. POPULAR MECHANICS ADVERTISING SECTION 15 1 inch to your biceps 2 inches to your chest an hours A marvelous system of mus- cular education that trans- forms weaklings into strong men almost overnight .. . This is not a fish story. It’s a fact! When I say I can add one whole inch of real live muscle to each of your arms and two whole inches of the same wonderful strength across your chest, in just 71% hours, I mean just that. But I don’t stop there. I do things with your body that even you never dreamed of. My business is to build muscle, and the health and strength that always come with muscle. In the past 19 years I’ve taken over 200,000 puny little underdeveloped bodies—coaxed them along—worked on them—filled them with new life—new hope—new terrifying strength that forced their owners to be powerful, fighting, proud he-men, And how simple it all is under my in- struction! Here’s How I Do It? All I ask of you is 7% hours of your spare time, divided into 15 minute periods for 30 consecutive days. In those 15 minute periods you are to do exactly as I advise, using the apparatus I send you. At the end of the 7% hours step before your mirror, and marvel at the transformation. Could that great, handsome figure be yours? Those huge broad shoulders—that immense barrel-like chest with its powerful lungs—those tremendous arms and wrists, ready to crush everything before them—could it be possible? Yours it can be—and quickly, too. But first send for my new 64-page book. Let me show you how such a body can be yours without risking a single penny. How m ironclad guarantee absolutely protects every si pupil. Send for it today. Get going to new health—new happiness —new joys now! Send For My New 64 Page Book ve , IT IS FREE EARLE LIEDERMAN Dept. 2012, 305 Broadway, New York City Dear Sir:—Please send me absolutely free and with- out any obligation on my part whatsoever, a copy of your latest book, ‘Muscular Development.” (Please write or print plainly.) Do you get that? It’s free. I don’t ask a cent. It’s yours with my compliments. Take it and read it. It's the peppiest piece of literature you ever flashed your eyes on. And 48 ful -page Rae of myself and some of my numerous prize-winning pupils. his is the finest collection of strong men ever assembled into one book— look them over—doctors, lawyers, merchants, mechanics and way line of trade you can think of. I swear you'll never let this boo get out of your hands again. And just think—you're getting it or nothing. Don’t hesitate—no strings attached to it. Grab it. Take 2 or pencil and fill out the coupon, or even your ress eee and ad on & postal will do—do it now before you turn BUOURG: cccccccccccccccccoccccccc] cA Boccce cases page. = Earle Liederman Street...... ecccee Coccccccccccccccccoccoocceecs Dwadt ecw icleteesesetese ved | OPTTTITT TTT Dept. 2012, 305 Broadway, New York City

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16 POPULAR MECHANICS ADVERTISING SECTION LOS ANGELES SS NATIONAL is a Million Dollar institution— ==} established in 1905—recognized throughout the electrical industry as one of America’s fore- most trade schools. NATIONAL offers practical, intensive training in all electrical branches. All technical essentials included. No age limit. No previous experience necessary. Life Scholarship privileges. Start any time of the year. 2. How Long to Learn Electricity ? NATIONAL properly trains you in the short time of 6to 9 months. Upon completing this Condensed Course you are oly qualified as a Practical, Competent a Electrician, and you have not risked your chances of employ- Ww because of inferior, incomplete instruction. 3. What Employment Service Does NATIONAL Guarantee? NATIONAL GUARANTEES to give unlimited and efficient eet > Service to students wishing to earn living expenses ee ¢ learning; and to graduates getting started in the electrical field. This is the most any reputable school can be expected to do. 4. What Inducements Does NATIONAL Offer? NATIONAL offers YOU the very best technical- -practical training that money can buy at a cost within every man’s reach. It does not offer to pay your railroad fare, room and board or other personal expenses, preferring to limit its activ oon to = PROPER TRA INING OF MEN FOR = 5. Why You Should Come to LOS ANGELES! LOS ANGELES is the heart of the country’s most rapid electrical development—as well as the world’s most ideal city in which to live and prepare for success in electricity 7 TE for FREE BOOK Hon NATIONAL Electrical School Dept. 538, 4006 Figueroa St., Los Angeles, California. nd our big free illustrated catalog of Electrical Opportunities showing quickly and get a Big-Pay Electrical Job. how I can learn “MY BANJO MADE ME POPULAR OVERNIGHT!” “N& mixer—that’s what everyone in town had me down for. They were right, I-couldn’t sing, couldn't play, whenever there was a party I was at-it—but not in it! hen I learned to play the banjo. Studied home at night—it was so easy, so simple, so much fun, that almost in no time I could play the most difficult pieces. “One ) es I played at a small gatheri Everyone was amazed. People noticed me now who never before knew I ex- isted. And to cap the climax, Mr. ..:.... ,one of our leading merchants, made me a fine business proposition—said he only wanted live wires in his organization. Take it from me, it was the turning point in my life theday I sent for details about learn- ing to play the banjo athome.” If you want to win quick popu- larity,or earn easy,extra money, then write for particulars NOW! TENOR BANJO STUDIOS Dept. C-103 9th Floor Woolworth Bidg. _ New York City LEARN WATCH REPAIRING! You can learn by our modern and original system of instruction every part of the Watch Repairing ‘rade at home as good or better than at a shop. You can earn money while learning and secure a well paying position or start in business after com- pleting our course of instruction. Good watch repairers are always in demand and earn from $50 to $75 per week. For particulars apply to the Wisconsin Schoo! of Watch Repairing 166 Mason St., MILWAUKEE, WIS. NTE = opt DRAFTING Se). THOUSANDS OF MEN will make fortunes in Aviation. Air op Drafting and Designing are the biggest jobs ahead in this fastest grow- ing industry. A new field of opportunity for you is opened in our improved method of training. EASY TO LEARN. STUDY AT HOME. PAY AS YOU GO. EMPLOYMENT SERVICE. Write for booklet outlining courses in Airplane Drafting and other aviation subjects, including the famous Weem's System of Navigation — endorsed by Col. Lindbergh, Commander Byrd, Lincoln Elisworth, Admiral Moffett, etc. Dns nb dbdedeusesdees Joeceseccles ceeeeese REI 6c c0de eh dbbsescs wovccccoceeesseses Ge invacecnctepteessecncs couse State..... [|] AIRPLANE DRAFTING AIRPLANE AIRPLANE MOTORS MECHANICS PACIFIC TECHNICAL UNIVERSITY 220 P0855

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ystem iring shop. Sure a r Com watch from to the iring POPULAR MECHANICS ADVERTISING SECTION 17 Le a Always worrying over money. Always skimping and econ- omizing—going without the comforts and luxuries that every man DESERVES for The Rut. his family and himself. The Time Ciock—a badge of hawk-like supervision and Low PAyY.. LONG HOURS.. ROUTINE.. NO FUTURE chine. A constant re- hance to express ideas and minder that one is ‘just an- | esting experiences. A long, } © & other nameon the pay-roll.”” | slow, tiresome road that — TDULD chee bee leads nowhere. Human cogs in a great ma- No chance to meet people, travel or have inter- L Always wondering what would hap in case of a *‘lay-off"’ or loss of job. No way out? I Said Good-bye to It All After Reading This Amazing Book- Where Shall We Send Your Copy—FREE? HEN a man who has been struggling along at a low-pay job suddenly steps out and commences to earn real money—$5,000, $7,500 or $10,000 a year—he usually gives his friends quite a shock. It's hard for them to believe he is the same man they used to’ know— but such things happen much more fre- quently than most people realize. Not only one, but HUNDREDS have altered the whole course of their lives after reading the amazing book illustrated at the right. True, it is only a book—just seven ounces of paper and printers’ ink— but it contains the most vivid and in- spiring message that any ambitious man ean read! It reveals facts and secrets that will open almost any man’s eyes to things he has never even dreamed of! Remarkable Salary Increases For example, R. B. Hansen, of Akron, Ohio, is just one case. Not long ago he was & foreman in the rubber-curing room of a big factory at a salary of $160 a month. One day this remarkable volume, ‘The ey to Master Salesmanship”, fell into his hands. And from that day on. Mr. Hansen clearly saw the way to say “good-bye” forever to low pay, long hours, and tiresome routine! Today he has reaped the rewards that this little volume placed within his reach. His salary runs well into aised My Pay 7007! the 5-figure class—actually exceeding $10,- 000 a year! Another man, Wm. Shore of Lake Hughes, California, was a cowboy when he sent for “The Key to Master Salesmanship.""” Now he is a star salesman making as high as $525 in a single week. L. H. Lundstedt, Chicago, read this free book—and raised himself from a stenographer to the head of a business with 600% increase in earnings. C. V. Champion of Danville, Illinois, raised his salary to over $10,000 a year and became President of his company in the bargain! A Few Weeks—Then Bigger Pay There was nothing “different” about any of these men when they started. None of them had any special advantages—although all of them realized that SALESMANSHIP offers bigger rewarmis than any other pro- fession under the sun. But, like many other men, they subscribed to the foolish belief that successful salesmen are born with some sort of ‘magic gift." ‘““‘The Key to Master Salesmanship"’ showed them that nothing could be farther from the truth! Salesman- ship is just like any other profession It has certain fundamental rules and laws- laws that you can master as easily as you learned the alphabet. City and traveling sales positions are open in every line all over the country. For years, thousands of leading firms have called on tne N. 8. T. A. to supply them with sales- men. Employment service is free to both employers and members, and thousands have secured positions this way. Free to Every Man See for yourself WHY “The Key to Master Salesmanship’” has been the de- ciding factor in the careers of so many men who are now making $10.000 a year. Learn for yourself the REAL TRUTH about the art of selling! You do not rsk one nny nor incur the slightest obligation. And since it may meanthe turning point of your whole career, it certainly is worth your time to fill out and clip the blank below. fend it now! National Salesmen’s Training Association Dept. W-102, N.S.T.A. Bldg. Chicago, Il. | | National Salesmen’s Training Assn., .. S. T. A. Bidg., Dept. W-102, N. S Chicago, Ill. | l Without cost or obligation you may | send me your free book, “The Key to | i Master Salesmanship."’ | Name ] Address ee ee eee ere State Age Occupation | wt ! Laccnsaeanceneangantantenenvearennanisial

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18 POPULAR MECHANICS ADVERTISING SECTION He Found the Key to $10,000 a Teact “Just a bookkeeper” — that’s how J. A. Hogg, now Public Accountant at Logan, W. Va., would have classified if six years ago when he first en- home-study training in Little he dreamed that within two years— thanks to his s training—his yearly income would be $5,000, and that two years later he would be making better than $10,000 a year! But read what he writes, under recent date— “It isn’t often by an investment brings money profit of more 7500 per cent in only six years, Sete pk. 3 what my enrollment in two igher Accountancy and Law— has eons to me. I estimate it worth more than $30,000 in cash returns, besides additional returns in personal and business prestige, in self-confidence and all-’round larger success. “Whereas when I first became a LaSalle member I was earning about $100 a month, today I have my own successful public accounting firm, and have been mayor and police judge of my home town for the a five years, LaSalle has made all this “I have enjoyed very much my LaSalle work. Your Problem Method has ~y¥ = revelation — so much easier and more efficient tha methods of my school days.” His Opportunity Is Yours— Send for Free Book you ambitious to make a real success in business—to nt yourself for for positions paying $3,000, $5,000, $10,000 a year, evi Here, then, is your chance—the same oe" that faced J. A. Regs when he aligped a LaSalle coupon. . oan is the coupon, and it will bring you—free—LaSalle’s e book, ccountancy, the Profession that Pays.’’ von win find it of the — help and inspiration. mean what you say when you say A ou want to get ahead —fll in, Tip and mail the coupo: Ow. —_—— —Find Yourself Through LaSalle!— —_—— LaSalle Extension University The World's Largest Business Training [nostitution Dept. 1264-HR Chi 3 should be ibegie’ to have details py fh the’ as ines field my hecked below Years’! Promotion oo in One all "ats ate out obligation. n O Higher Accountancy CO Modern Salesmanship [Modern Busines, O Traffic Manag Corr D Railway Station Mgmt A Modern Foremanship O Railway Accounting O Expert Bookkeeping CD Law—Degree of LL.B. UC. P. A. Coaching Oce O Business English o ener are ann A Commercial Spanish oO Banking Kon eg Effective Speaking O Stenotypy—Stenography O Personnel Management [] Telegraphy 0 Credit and Collection Correspondence Name Se ae Add: Aviation Stories of the Future Air Wonder Stories is a revelation in Science Fiction Stories of the Air. Many monthly contributions by noted science fiction writers. Thrilling : Daring : Visionary Read one issue and you will be impatient for the next. On Sale at all newsstands— 2c the copy. Special subscription offer—one dollar, eight months, Stellar Publishing Company 98 West 5 Place, New York City MUSIC L LESSONS oi HOME You can read music pm this quickly Write todayfor our FREE BOOKLET. It tells how to learn to play Piano, Organ, Vietin. Mandolin, Guitar, Banjo, etc. Beginners or ad- vanced players.. You pay as you learn. Costs only a few cents a day. Thousands rs SuDOL an asic. AMERICAN Music, 61 Manhattan Bidg., CHICAGO —the first step toward a good job in ELECTRICITY The sensible way to “break into” Electricity is to learn WIRING. Then the doors of opportunity in the world’s most prosperous industry are open to you— The new idea is to first learn how to wire bells, annun- ciators, alarms—how to wire homes and stores and fac- tories for light and power—how to estimate the cost— —then cash in on the training, before tackling the next branch. You will be surprised how quickly you can learn WIRING, at home in your spare time, by our ] OB-ticket method of practical experience— s —takes only a few months—costs only a very few dollars. Unit Plan (Now, there is no longer any need to take a “C Book Course” costing hundreds of dollars, requiring years of t ime.) | Start with WIRING but don’t stop when you're an Elec- FREE trician. From time to time you can learn motors and | generators, electrical drafting, power station equipment, radio, or other advanced subjects. Plan to learn one thing at a time and to advance one step at a time, unti 1 you're at the top of this money-making business. If you are interested in getting into Electricity—rght, send for Free “Unit Plan™ book American School Dept. Eee Drexel Ave. at 58th St., Chicago AMERICAN SCHOOL, Dept. "ES, Drexel Ave. at 58th St., Chicago Please send free Unit Plan Book, and tell me all about WIRING and other low-cost, quick Electrical Units of home training. Name. Address. sail ga°) te 7 ws

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. dries ure tories science of the nthly noted vriters. isionary you will he next. nds—25¢ scription t months, ompany York City “ nm to play ers or ad- ats a day. job B to learn e world’s is, annun- and fac- cost— the next can learn )B-ticket w dollars. tors and uipment, ne thing til you're y—right, hicago bookcase table, made of genuine Brown Mahog- any, is included with every set of the new Britannica. This completely POPULAR MECHANICS ADVERTISING SECTION Envcycloparei en 1 ritannica HIS is the year of all years to give the Britannica for Christmas! For today you can give a completely new Encyclopaedia Britannica—the superb Four- teenth Edition, that has just come from the presses. A gift that brings lasting appreciation LL the family is included when you give this new Britanr.ica for Christmas! Here is a Britannica made new from cover to cover. A Britannica so different from any other encyclo- paedia that there is literally no comparison, Everyone in the home will be thrilled with such a gift. Think of the eager excited interest at Christ- mas! These twenty-four handsome volumes, in the graceful bookcase table which is included with each set, will attract all eyes. There will be no gift more excit- ing beneath the Christmas-tree this year; no gift, certainly, which will give such lasting pleasure. For young and old alike—the child in school, the woman who wants practical help with her home or family, the student engaged in re- search, the busy man ofaffairs whose reading time is limited—for every- DELVE LELEO ELS see}> |F city MAIL THIS COUPON TODAY one this superb new Britannica is the gift of gifts. Wherever the finest things of life are appreciated, men and women are proud toownthenew Britannica. The handsome bindings, the pro- fusion of rich and colorful plates, indeed the superb craftsmanship shown in every detail, set this book apart as a gift of rare distinction. This new Britannica, prepared at a cost of more than $2,000,000, is a library in itself—written by 3,500 leading authorities from fifty differ- ent countries, for Every American Home” this one does. And notin twogener- ations has a completely new Britan- nica been offered at so low a figure! Mass production has made it pos- sible to place the greatest of all ency- clopaedias within the means of all. Send for Free Booklet Make this Christmas a Britannica Christmas! You have the opportunity now to learn why this new Britannica is the finest gift you could select. But the time is short, and you should act promptly. The coupon below will bring you our special FREE booklet telling the full story of the Britannica and describing the various bindings and the bookcase table now in- cluded with every set. Mail the coupon now! (This obligates you in no way whatsoever.) Extremely Low Price Yet this incom- parable encyclo- paedia comes tc you at a tremen- doussaving! Never has any encyclo- ENCYCLOPAEDIA BRITANNICA, INC. 342 Madison Avenue, New York City Please send me by return mail, without any obli- gation on my part, your 56-page illustrated booklet describing the new Britannica together with low q price offer, etc. PM9-—C3 4 Name. paedia offeredsuch manifold riches as Address

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20 POPULAR MECHANICS ADVERTISING SECTION We Will Train You in a Few Months Wonderful Future in this Uncrowded Field $125 A WEEK as MECHANICAL DENTISTS We teach you to make rub- ber plates, crowns, bridge work, metal base dentures, etc., for dentists. After graduating you are ready for a job or can open your own laboratory. We assist you. Big Demand for Men! Mechanical Dentistry is the laboratory bench work which the dentist turns over to the laboratory worker. Master this profession and help meet the demand of 64,000 dentists for laboratory work. Every city and every town where dentists are located offers work to the mechanical dentist. We train you in a few months in day or night school for this uncrowded field—no classes—no books—no mechanical ex- perience necessary. No Educational Requirements. Work Your Way Thru School We will help you find a job to meet your expenses while taking our training. And we will help you find satisfactory living quarters when you arrive. Schools located in Chicago, Detroit, ope en Boston, Philadelphia. Day and night school We pay railroad fare of students who cee. INTERESTING FREE BOOK Our illustrated free book on Mechanical Dentistry will acquaint you with some surprisingly interesting facts. It tells about the thriving profession of Mechanical Dentistry—the way to swift and certain success. And it tells about the progress of many of our graduates—men who have suc- ceeded beyond their expectations, also full details of our liberal offers. Mail the coupon and find out more about this fascinating opportunity. McCarrie School of Mechanical Dentistry 1338 S. Michigan Ave., Dept. 359, Chicago, III. Pees es eS SS SSS SS SSS SS McCARRIE SCHOOL OF MECHANICAL DENTISTRY 9 1338S. Michigan Ave., Dept. 359, Chicago. i Without cost or obligation, send me your illustrated book on é Mechanical Dentistry, and complete information as to my t opportunities in dental laboratory work. ft f Daw ewe scdvccwovevevccccocvevceveceseervevcessedeh } i i ttndén cietesba dee denedrwees 40 ttAsensawss cess ‘ Auto M. BEDFORD) === oO igh ore ding Machine Shop. Hesery Repas® Electrical Course. vnake Mechanic er mee Architectural Drawing rplane Drafting * Estimati indow TRADE SCHOOL sae Ole) & he) De Oe) 0) - 2-5 at Home Carry on your education. Runiep pune 20 initiate and achieve. Earn credit Bachelor et or Teaching Cerdheate et pm > nce. Select from 450 cours- ' es in 45 subjects, including English, Mathe- matics, ae Le Education, Psychology, Eco- the Languages, etc. Write forex catalog. The University of Chicago 427 ELLIS HALL CHICAGO, ILL. BOOKS SENT FREE! Only fifteen mien a day with these WON- DER BOOKS will prepare you for a good Drafting job in less thanayear! Mechanical and Architectural Drafting from simple For Beginners straight Bnes to important, « complex plans, a step at a time: t ci an Ng dh for men with only grammar ~# 4d, ” Draft. word, by 18famous ing room practice plus engineering made easy Engineer and Ar- and clear! hitects. fiexibie binding. Big Field—Big Demand—Big Pay ! pa Draftemen are urgently right now in all blue Lang P_. uilding and manufacturi eax at eo to Bo ° wea x. br ~ That's just the beginning—fer dreftemen the beat chances fy Fregeres fer Pleasant, f Sanne A easy to learn 738 _— a Lm ae ‘and do. Learn quick with i books—send coupon for « architectural, lines. Bent eet FREE, and see for yourself! for 15 days’ free use, if A year's Consulting Membership tn the p= Fy coupon imme- ae Technical Soctety now Sree to ali readers of this fanous Cyclo- pedia of Drafting. 7. say that's worth = oe cost of boo Dept DUIS. Bain & Drexel Ave., Chicago ) American Technical Society Dept. D919, 58th & Drexel Ave., Chicago Send for 15 days’ free use 4-volume set of DRAFTING In return pe Lay this pon D2 promptly oon absolutely FREE “Modern A nm somes, a watts plates, ‘exteriors. interiors ai plans. l will pay the ape te delivery ee. b I may owe you nothing. oe os if Tb x to kee oy é will AS y $1.80 after 15 days, thea $2.00 » month until $14.80 (special red Drice! BING oc co cee ccccccccccccccccsccccsosecessccneseesoess Address ..... yo wo ma

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POPULAR MECHANICS ADVERTISING SECTION 21 OST of the world works for a living—works hard, too. But that doesn’t mean you have to. Why not play for a living? Do something you like to do, and make it pay you big money. Plenty of men and women who had a hard time to get along six months ago—are now making from $50 to $100 a week—playing their Hawaiian Cuitars. And they didn’t know how to read a single note of music when they came to me. America’s Most Popular Music The haunting, soft, melodious strumming of the Hawaiian Guitar is America’s most popular music. Everywhere orchestras are looking for men and women who can play the Hawaiian Guitar. Everywhere those who have mastered the Hawaiian Guitar are getting paid more and more money. Roy Reibane writes in, “I have made $200 extra money in 6 weeks playing my Hawaiian juitar.”” Carelton E. Scarbro recently wrote me, “I have made $1000 since I took your course.’’ Granville Smith writes, “I make $8 a night and play only 4 hours.” . Dozens of such letters have come in. Ww G But let me tell you about my short-cut e nv to good times and big pay—my sim- this plified method of learning to play the Hawaiian Guitar at home in a few weeks. A new method — so easy to understand — so much fun to learn — that even a child can pick it up. (We have successfully taught children only 8 years of age.) “A friend asked me if I could play the Hawaiian Guitar. told him I'd only been posing for a few weeks, but he said, ‘Come along anyway, and play at the dance.’ I made out very well, and was paid $16 for my first night's work. And I see more opportunities ahead.” — RALPH PRUTZMAN, Lehigh- ton, Pa. 7 e You une One of the Dozens of Photo helps sent with Pictures Instead of a ties ae Words, Teach You All I ask is that you Mke music. I don't care if you have never read a note in your life, or even know what a Hawaiian Guitar looks like. My methods are so clear and easy to understand that you will actually play areal melody after the very first lesson. Sounds uncanny, doesn'tit? Here’show I doit. With your lessons I send dozens of photographs showing just how to place your fingers, how to strum the strings. My Kno-All Chart teaches you to read notes almost automatically. It's as simple as learning your A B C’soveragain. Some of our students become finished musicians the first month, others take a little longer, but they all learn with surprising speed. Lonesome? It’s a Sure Cure! Once you have mastered the Hawaiian Guitar, the world lies waiting at your feet. You can travel anywhere, meet the best people, live in real style and comfort, and gain a host of friends. All this is yours, waiting for you, if you are willing to spend a few minutes a day with me for a few short weeks. Everything is explained. Every last bit of proof is given you. It shows you just how you Can master the Hawalian Guitar at home in double-quick time. How ycu risk absolutely nothing to learn. How I sen’ everything you need. Get on the road to Big Pay and Pleasure Today. Write Now! oS BE ae ee em ee ee @ A. F. Bloch, President, @ Hawalian St , 52129 of m New York Ac of Music, 100 Fifth Avenue, New York City. Wichout obligation, send me FREE Book *‘ How to Learn Hawaiian Guitar’ with facts on how I can make BIG MONEY, spare- time or full-time. We Send You Reg- ular Phonograph Records of Every Piece in the Course And we don't miss a single bet. To make sure that you can't £0 wrong, we send you a whole set of regular phonograph records, on which are recorded every melody you learn to play while taking the course. These aid you to correct minor mistakes, and make you sure that your technique is per- fect. With these records to guide you—the tiniest error in your playing is quickly corrected. These records come absolutely free with the course, and are an excellent addition to your home music as well. Name TTITILLII yy

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A giant iii dips and soars across the sky, leaving against the brilliant blue the one word.... ELECTRICITY...... Men stop and gaze at the huge letters written so gracefully thousands of feet above the earth. Somewhere an electrical expert has groomed the giant plane for its flawless flight . . . every wire tested... every electrical device in perfect running order. Today industry is as dependent upon the expert electrician as the powerful plane tracing the magic name over countless cities and towns. To him come the profits of industry and com- merce. You, too, can be an electrical expert. Write today for the 48-page booklet. NEW YORK ELECTRICAL SCHOOL 44 West 17th St., NEW YORK +-—-——--MAIL TODAT-—————, ; THE NEW YORK ELECTRICAL SCHOOL I 44N. Y. E. S. Bupc., 177 Street, New York | Please send me FREE your 48page booklet. Jt is understood that | this request puts me under no obligation. | | l EE ia he Xd eae 46 dbo Oberle SO ae USK. 6 eal gee i | | DE Avesbisonpethewgessédacudsne nas s dee | bee eee ee eae ae ee ee POPULAR MECHANICS ADVERTISING SECTION Books on 65 Practical Subjects Po; Mechanics Press specializes in supplying the outstanding best to on many subjects. As new books of merit appear, we will revise the list accordingly. AIR NAVIGATION AND INVESTMENT Am: EOROLOGY . that pay very flyer needs..... $3.00 y Ray Vance...... $4.00 AIRCRAFT ENGINES JOINT WiPING Dyke's New Instructor (New Edition)........ $1.00 Book... . $5.00 KITES 1 THAT FLY ARCHITECTURAL How to make........:. $1.25 Dra $2.00 a —~ sheng rawing and tering . $2. ARMATURE WINDING Excellent new book. . . . $2.00 Prac’ $2.50 LATHE WORK (METAL) AUTO ENCYCLOPEDIA and ae and Thread Dyke's. (Covers New Cutting. ........... $1.00 Model A Ford)...... $6.00 LETTER WRITING AVIGATION aoa or Business y Dead Reckoning....$2.00 | Only............... $1.00 sino HOUSES MACHINIST ow to Make......... $1.00 rr 4 -— Mts fhe & be $1.50 8 NT LUE ome " eke $2.00 200 _™* Tricks for Am- BOAT BUILDING een enw eee ees $1.00 ateurs aw. spepes BOY MECHANIC Saroome “articles. - $3.00 Famous 4 Vol. aye wh 4000 900 D MATHEMATICS e. $7.08 Made Easy for the Prac- ILT-IN RNIT th ERS . = “IN FURNITURE MECHANICAL DRAWING CARBURETORS actical Course in... . $1.00 Excellent book on all MODEL AIRCRAFT en Ftheess c6ek $2.00 Building and Flying. . . $2.25 CARPENTRY MOVIE MAKING um, Kinks. $1.50 for Amateurs. . . ... $3.00 ours jo For os zane Young res ss S R OPPoR- tor Mating a Living. ..$2.00 OUTDOOR SPORTS for All Year "Round... $1.50 civiL, ‘SERVICE How to Prepare for. . . . $3.00 COLOR SIMPLIFIED PAINTING Practical new Book (for House (Best Methods) ..$2.00 Color Users)........ $3.50 PETS CONCRETE For Pleasure and Profit.$2.00 1X ew Baltion (Cloth) $2.00 | PLUMBING CONTRACTOR oe Facts for Cost Estimator.$2.00 Every Homeowner. . . $1.50 Es 00 (New Work). Best Au- POWER Wikine (oc. spertiy beeae Ne 6660s $5.00 Eiovtrieal (Just Out) .. ©>. se t Pu Care and Raising...... $2.00 Amusing Mathematical.$1.50 Fors Practical Kinks... .$1.50 | RADIO ‘ c inks... .$1. Trouble Shooting. Covers ELECTROPLATING All-Electric Sets and Practical Results Easily Television.......... $3.00 aaa” ceecceveccee $1.00 ROPE SPINNING Self-Improvement in. . . $2.50 onary eben ae ETIQUETTE Making ..:......0%... $2.50 Bane Bock... | spe NOTES || 2 =e $1.0 B "Vols. of 6000 Vatu- Vv able Kinks....... $4.50 STEEL SQUA ARE Pocket Book, Practical . $1.00 TAXIDER r Far FLIGHT TRAIN mY Best Book of Methods. . $3.50 Practical, new book best on subject........... $5.00 TENNIS ros "Philosophy By Helen Wills........ $2.00 Industry......... $1.50 TOY MAKING ronmut AS Complete instructions. . $1.50 10,000 Money Making . $4.00 WELDING FURNITURE ENCYCLOPEDIA Homemade @ vols)... .)...$3.00 um bedcececs $5.00 m PAIRS ss Book of...... $2.50 House (New Book). .. . $2.50 veces » -- ~qemaaahaaa WOOD TURNING (LATHE) new Practical Course in. . . . $1.50 iin ac» new 6.06% WOODCRAFT bw 4 $4.00 INVENTIONS (American) Popular History of by Ernest Thompson 2 vols. Reduced to. . .$5.00 Seton; Only....... .$1.00 Books sent C.0. D. anywhere in U.S. Just check the books you want, write your name and address below, and mail the advertisement. It is your order blank. When post- man hands you books, y him the price and the postal charges If outside the U. 8S. remit when ordering and include 10 cents per book extra for postage. We have many other books on these and 2,000 other subjects. Catalog free. Famous 590 Page Book WURMER. oc ccvsccccccccscccccccesconneccccccccoeccoscossocecs . Mall to Pepular Mechanics Press, Room P12—200 East Ontario St., Chicago, IIL

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POPULAR MECHANICS ADVERTISING SECTION 23 ding » we 4.00 1.00 1.25 2.50 J 1.00

1.00 1.50

Major R. L. Rockwell Says: ‘ —3_1l11 TrainYou at Home 1.50 Major Rockwell —and in 12 Weeks You Can Master Every Principle of nt Ground Training Which Is Necessary Before You Are 1.00 World War Flyer jf 2.28 Who Will Teach You Ready to Take Your Place in Any Branch of Aviation”

3.00 Of course you want b set into Aviation peg ing each other for men with proper training! Major Rockwell is a fa- Every man, young an is eager to take h Now is the time for you to start! And ~ Home- } mous world war _ flyer, ja and ~— = mae | this ag growing — +. the —_ —-. 97 ndustry which is paying incomes to trainec pensive way for you to make e star 2.08 Coqenes “and the War men. Aviation e - 4 only ay : . —_ coupon for my fascinating book which gives all 1.50 Cross. He is now devot- manufacturers and airports are literally raid- details. ing himself to teaching 2.00 <n 7 : Aviation, and he will train Wou Learn Aviation Ground Work at Home 4Q smn 2.00 : Jobs reat new industry as only a Veteran Word —Then Choose Any of the 40 Ground Jobs| enn 1.50 ¥ = Fiver | can a “all's Right in your own home, devoting hi im ground work in-| |. bese nga tel 2.00 ms ajor Rockwell's about an hour a day, I teach you the struction to land any real good job | 1). ne in serv- guidance your future in essential Aviation fundamentals cover- in this new fast-growing industry. | jcc means 40 3.50 Aviation is assured. ing every phase of ground work, as well I will help you find your proper place in | men on the A the principles of flying and naviga- Aviation and start you on the right road | ground, all 1.50 tion. This is the same instruction that tosure success. Manufacturers, Trans- | highly pa’ you would receive if you went away toa pert Companies and Airports ; refer Riggers ground school. It makes no difference ockwell trained men. hen you a enere 3.00 sevtinte whether you intend to fly or to make want to go farther and take up actual triclans Make your mark in Aviation as a designer, flying, you can come here to Dayton | metat 1.50 Good rigger, motor expert, repairer, inspector, where I'll see that you get your flying Workers builder or in any of the 40 big-pay _instructionsat one of America’s finest air- Draughts- Prothero ats: 2.50 Erethes ground jobs, you must have this .ports—at my special reduced prices. fn ne main at. thing abow e r - 4.50 eee tas No Advance Education or Experience Needed rectors 1.00 mothe po yahmemey pyran den 4 You don’t need to have any previous edu- § fundamental principle of A fation ground a Wan Knowledge of Aviation, but eave cation to master my course. You do not work and you will be well on the road to| wetders 3.50 me valuable pointers on how to even need to know anything about air- qualify for any important aviation job] Transport ne oS planes or mechanics. My home study paying ying $300 to $400 a month. My Home Managers 2.00 Fi gm ae ye course is thorough and complete. Every- tudy Course will also give you all the] g¢c.. etc. National Air Surveys, Inc., and thing is clearly explained with easy-to- knowledge necessary to pass the Govern- ° 1.50 am making more than three understand text and pictures. In a few ment’s written examinations for mechan- times what I ever earned before short months you will have grasped every ics’ or pilots’ licenses. annot say too much about your individual method of train- 5.00 ing men in Aviation.” Money Back a8 A Get My No-Ris HE) Employment Guarant ft O~-. kPlan 1.50 Se I am so certain of your suc- . rvice cess in Aviation that if you My Bi Book, After you Spe ws I help are not satisfied after com- 4 1.09 ‘you get a job without cost. pleting my course, I will re- &. la ALL rege ‘here’s a great demand for fund every cent of your XP 3nS S men with Rockwell training! tuition. Y : — We Aviation Begging for Trained Men ed os TR: ye men can command the high salaries. Em- ‘ges ployers are glad to pay big money for men who know =~ Aviation—builders, mechanics, service and maintenance ay Rob’t L. Rockwe' an

men, and flyers. high salaried Aviation jobs open to the trained man. prepare you at home to take your place in the most fascinat- ing, fastest growing industry coupon to me for a copy of my famous free book. NGS 660 66 8655550000 8065 5s 0'50.05066560050005 00500885050 T MAJOR ROB’T L. ROCKWELL I cnitihnnnniiconenriesincnanescitnniadlstbiaidasll THE DAYTON SCHOOL OF AVIATION ache hne ne becrrevnseneececeses MOROB. 2s cccccvceed Age..... ee Desk S-1 Let me prepare you for one of the many I will in the world. Rush this offer.

DAYTON, OHIO

‘ton School of Aviation Ohie. Desk $-4, Dayton, Dear Major:—Please send me FREE and without obligation a copy of your famous book on Aviation; also your special tuition and position

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Win fame— friends—for- tune! Play the Hawaiian Play all the latest hits ust as the Hawaiians do! ave good times aplenty! Guitar! Native Hawaiian Learn at home expert directs you in spare time You get expert instruction di- | Study in spare time at home. ee bya ee — ae player | Even if zou don’t know a note teacher, Prof. Walter | our method is so simple, plain Kolomoka, He quickly reveals | and easy, you begin a piece your you the secrets of this fas-| firstlesson. In half an hour you cinating instrument. can play it! Only 4 Motions Complete Payasyouplay to learn. Then you Course We make it easy can play any music | 52 lessons. Nothing —popu songs, | omitted. Pictures small first payment c 1, old-time explain every move. a melodies, easive You are sure to learning. Costs only Hawaiian learn—what we can few cents per lesson. real jazz. You’ il do for others we | You only pay the never be lonesome — do, Soe you. cost of instruction giver = on aa Over suc- —we furnish every- cessful yon A thing. GIVEN "=" —with genuine seal grain Fabrikoid Cover and come plete playing outfit—this beautiful sweet-toned HAWAIIAN GUITAR Reliable retailers ask $18 to $20 for a similar instrument and outfit without the fine Fab- rikoid Case, which alone is worth $3.50 Instrument Sauls weseeden *18 2°20 Other (Banjo, Violin, Tite, 7 Tenor “ Courses |Guitar, Ukulele Ukulele—well-known Be venst AWAIIAN MUSIC, Inc. a New ol Approved as a Correspondence School Under the ion of the State of New York Member National Home Study Council Send This Coupon for Liberal Offer? FIRST HAWAIIAN + aren trl OF MUSIC, Inc. oolworth York, N.Y. Please mail full information about. "your 52-lesson Hawaiian Guitar Course. I am not obliged to enroll unless I want to. Name.

Address

City State

POPULAR MECHANICS ADVERTISING SECTION

Young men needed jy Davey Tree Expert Co. Interesting, vigorous outdoor work in a growing organiza- tion where merit wins advancement. Good starting wages. Permanent positions and a real future for men who make good. Expansion to meet increasing need for this unique service creates additional openings. So we are selecting now, to enter our employ, a number of sturdy, clean young men, thorough Americans, single, between 20 and ase old, free to travel, industrious, with good practi education, and able to give good ae Write for qualification blank to serve i place of personal interview. The Davey Tree Eapek Co., ue Hl 311 Federal Bidg:, Kent, Ohio. spy C CAN pe “ard id ee 2 tte "0... .. 0e ex. 4 ees <, Dept. 20, N.Y. City EARN MONEY /MMEDI/ATELY~ WE FURNISH EQUIPMENT TO START /’ Make Much Money es and Selling Your Own Goods. For- y experts. Manufacturing Processes. Trade-Secrets. All Kinds. All Lines. Send for interesting catalog, special circulars, free. B. THAXLY CO., WASHINGTON, D. C. .TAMMER ag ale for my free book “*Millard’ s Advanced hn Corrective Course” and a free copy of my speech magazine. 10,000 cases successfully treated.

Est. 24 years. Lar school for stammerers in world. Millard Inst. of Normal Speech, 2317 Millard Bidg., Milwaukee, Wis. LEARN WAT CHMAKING saxo ENGRAVING \ BY OUR PROFIT-SHARING PLAN ) OUR GRADUATES SUCCEED (2 ‘ dente, started in a very small way —now sys 880,008 a reat, “Another Jn, Winona, ovze B08, te yor wri \Chicago School of Watchmaking, Depl. 5901 549 W. Randolph St., CHICAGO

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POPULAR MECHANICS ADVERTISING SECTION 25 7 FREE Bi. / AND FREE BOOK “HOW TO READ BLUE PRINTS” SHOW YOU THE WAY TO BIG PAY JOBS Building Gogeegnetsent & Building Estimator — —$5,000 to $12,000 $6,000 to $10,000

Building Inspector—$4,800 ay comet 7 Real Pstate Expert—$5,500 Appraiser — $6,000 to $10,000 8 Construction Foreman — $4,500 to $8,500 Material Buyer—$5,000 to $7,500 “uo klhUWwWlUC my Ges fascinating Book “‘How to as Read Blue Prints” that tells BOOKS + all the interesting and in- I structive facts about Blue @ISO Print Plans. Don't —_— one penny ser no C ».—It's all FRE ER Just fill out and mail the coupon today— NOW!

This is the kind of training that quickly puts men J into the high salaried jobs—or into profitable con- IF YOU LIVE Chicago Technical School tracting businesses of theirown. Yet now you get NEARBY for Builders—Dept. R-142, C hicago Tech. it 7 at ——s —_ 2 o? months. It ge Cite-cn the as eteiien Building, 118 East 26th Street, Chicago, Ill. no extensive ucatioa. you can read an a ss tees “Hann Ric 2 ee Prints.” understand what is written here you can easily Builders, You can get. the complete sett rea Blue Print _ T dderstan bg toy naster te same training at ome y to keep without obligation t is also understood that no salesman —~ & : ne and See what this training has done for others: Bar- oo ag ap yh a wile me. tholomew, Calif., became a contractor at an in- is enough. Name * Chicago Technical AMA. eeeseeeeeeeeeeseeseneeeseeeenens City.. State SCHOOL for BUILDE RS * Pe Age Occupation Dept. R-142, 118 East 26th St., Chicago, Ill.

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26 POPULAR MECHANICS ADVERTISING SECTION High School Course in Two Years! You Want to Earn Big Money! And you will not be satisfied unless you earn conty pro- motion. But are you prepared for the job ahead of you? Do you measure up to the standard that insures success? Fora more responsible position a fairly education is necessary. To write a sensible business letter, to prepare estimates, to figure cost and to compute interest, you must have acertain amount of preparation. All this you must be able to do before you will earn promotion, Many business houses hire no men whose general know- ledge is not equal to a high school course. Why? Because big business refuses to burden itself with men who are barred from promotion by thelack of elementary education. Can You Qualify for a Better Position We have a plan whereby you can. Wecan give you acom- plete but simplified high school course in two years, givin ou all the essentials that form the foundation of practical usiness. It will prepare you to hold your own where competition is keen and exacting. Do not doubt your abili- Re but make up your mind to it and you will soon have the requirements that will bring you success and big money. YOU CAN DOIT. Let us show you how to get on the road to success. It will not cost you a single working hour. Write today. It costs you nothing but a stamp. American School Dept. H-47 Drexel Ave. and 58th St., Chicago be eee oe American School Dept. H-47 Drexel Ave. and 58th St., Chicago Send me full information on the subject checked and how you will help me win success. ....Architect +... Busi Law .-.-Building Contractor Lawyer ....-Automobile Engineer Machine Shop Practice .-..-Automobile Repairman Mechanical Engineer -..-Civil Engineer | «+--Shop Superintendent +++-Structural Engineer --..-Employment Manager -..-Business Manager -- Steam Engineer ...Cert. Public Accountant foremanship ...-Accountant and Auditor Sanitary Engineer .... Bookkeeper urveyor (& Mapping) --..Draftsman and Designer ....Telephone Engineer a -+--Electrical Engineer ..-. Telegraph Engineer ----Electric Light & Power ....High School Graduate ..-General Education --..Wireless Radio ---- Vocational Guidance ---Undecided ee I Teach by Mail I CAN make a good Penman of you at your home during spare time, no matter where you live or p how poorly you now write. My sim- plified system has shown thousands of others the way to good penmanship during the past twenty years — it cam and will do the same for YOU Beautifully Illustrated Book * How to Become a Good Penman” It contains general infor- FREE t mation, with testimonials and beautiful specimens of penmanship showing what others have accomplished by the Tamblyn System. (Your name elegantly written on acard tf you em close stamp for postage.) WRITE TODAX. Address F. W. TAMBLYN 418 Ridge Bidg., Kansas City, Mo., U. S.A» WORLD weeps PLUMBERS Old style plumbers are fading like the horse and bug- . The world demands modern Plumbing and | Reimed Mechanics to doit. Unlimited, swift qowing field. Make $50 to $100 a week We train you quick. Learn in 8 to 12 WEEKS to do any job with skill and science. Need no previous experience. Strictly toolusing systems Opportunity knocks. Investigate today —amazing offer—low tuition. World’s greatest school. or start own shop. My OOL UNIVERSAL PLUMBING SCH 2130 Troost Ave. Kansas City, Mo. WHY NOT spend Spring, Summer and Fall gathering butterflies, in- sects? I buy yor of kind inds for collections Some worth $1 to $7 each. Simple outdoor work with my instructions, pictures, price-list. Send 10 cents (not stamps) for my illustrated Prospectus before sending butterflies. LA DEALER IN INSE mR. " Dept. 6. Box 1424. San Diego, Calif. Ultra- modern : Piano Jazz taught by mail. Note or ear. Easy rapid lessons for adult beginners. Also Self-instruc- tion system for advanced pianists. Learn 358 Bass Styles, 976 Jazz Breaks, hundreds of Trick Endings, Hot Rhythms, Sock, Stomp and Dirt Effects; Symphonic and Wicked Harmony in latest Radio and Record Style. Write for Free Booklet. WATERMAN PIANO SCHOOL, 1826 W. Adams St., Los Angeles, Calif. . time. Also Make money taking pictures. during earn _ rR learn. ‘No experience necessary. New cacy method. Nothing sise tike it. once for free book, OPPORTUNITIES IN MODERN PHOTOGRAPHY and full particulars AMERICAN SCHOOL OF PHOTOGRAPHY Dept. 1359 Michigan Ave. Chicago,U. S.A.

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tomp icked style. s, Calif. Also IOERN POPULAR MECHANICS ADVERTISING SECTION 27 Turned To Ice When [Tried To Talk ~ But Now I Can Sway An Audience of Thousands! even the most commonplace pty voice would sound unnatural and my hands and knees would tremble. Often I would listen to an argument among a group and become so keenly interested that I would want to voice my own opinion—yet timidity would keep me silent. I never had the courage to stand up for what I knew to be my rights—I was always afraid of ‘‘what peo would say,” of page > Since my childhood I had had a secret ~ sire to appear i att turned t be active in politics—but my shyness was so pres | LA turned to ice when I tried to talk—in even the smallest gath My inebility rH talk was also affecting my_business success. I dreaded going in and asking for a raise — I was afraid of any situation that meant using my voice—having to express myself. I didn't know how to present the ideas which I was sure the firm could use. I was just a plodder—a truck horse, capable of doing a lot of heavy work but of no use where brilliant performance was required. Often I would see men who were not half so thorough nor so hard working as I, promoted to positions where they made a brilliant showing—not through hard work, but through their ability to talk cleverly and convincingly—to give the appearance of being efficient and skillful. i HAD always been painfully bashful. When trying to carry on What 20 Minutes a Day Will Show You How to — before your club or lodge se and respond to toasts ress board meetings In Twenty Minutes a Day How to ott entertaining stories _And then suddenly I How to make a political speech discovered a new easy How to make atter-dinaer speeches| Method which made me How to converse interestingly & forceful speaker al- How to write letters most over night. I How to sell more goods learned how to domi- How to train your memory nate one man or an How to enlarge your vocabulary audience of thousands How to develop self-confidence —how to say just the How to acquire a winning personal-| ‘ight words at the right ity time, how to win and How to strengthen your will-power| old the attention of and ambition those around me, how How to become a clear, accurate} %° xpress my thoughts thinker simply and clearly, yet How to develop your power of con-| ‘!" ® Pleasing, inte! centration ing and amusing way. How to become master of ary situa-| 1° just a few months I tion was able to make cam- paign speeches for a local candidate—I who a short time before had turned to ice when I tried to carry on an ordinary conversation! Soon I had won salary increases, promotion, popularity. power — I always have a ready flow of speech at my command am able to rise to any occasion, to meet any emergency with just the right words, to approach all types of pout with ease and fear- lessness. And I accomplished all this by developing the natural »wer of speech possessed by everyone, but cultivated by so few y simply spending 20 minutes a day in my own home on this most fascinating subject. Send for This Amazing Book This new method of training is fully described in a very interest- ing and informative booklet which is now being sent to everyone mailing the coupon below. This book is called, How To Work Wonders With Words. In it you are shown how to conquer stage fright, self-consciousness, timidity, bashfulness and fear—those things that keep you silent while men of lesser ability get what they want by the sheer power of convincing speech. Not only men who have made millions, but thousands have sent for this book— and are unstinting in their praise of it. You are told how to bring out and develop your priceless “hidden knack’’—the natural gift —— you—which will win for —— you advancement in position and Now Sent y salary, popularity, social stand- FREE ing, power and real success. You can obtain your copy abso- lutely free by sending the coupon. NORTH AMERICAN INSTITUTE 3601 Michigan Ave. Beet. 1359 CHICAGO, ILLINOIS I No rth American Institute 7 | 3601 Michigan Ave., Dept. 1359, Chicago, Illinois. I Please send me FREE and without obligation my copy ot] your inspiring booklet. How To Work Wonders Wtth Words, I and full information regarding your Course in Effective Speaking. | = eer | | Address..... | City ee 1

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28 POPULAR MECHANICS ADVERTISING SECTION Students at work on 1929 Packard Str. 8. 19: Soto, Chev., Ford, ‘Oak tand—and 11 more chassis. earn Atitos GINZLOS ANGELES i. MATES Ants Senoed Best Equipped NATIONAL is a Million Dollar institution— established in Los Angeles in 1905—recognized throughout the automotive industry as one of America’s foremost trade schools. NATIONAL offers practical, intensive training in all automotive branches. No age limit. No previous experience necessary. You learn by “Actual-Shop” Methods. Life Scholarship privileges. Start any time of the year. — 2. NATIONAL Qualifies YOU to Make Good NATIONAL properly trains you in the Auto Trades in the short time of 4 to 6 months. Upon completing this Condensed Course you are fully qualified as a Practical, Competent Automobile man, and you have not risked your chances of employment because of inferior, incomplete in- struction. 3. NATIONAL Guarantees YOU Efficient Employment Service NATIONAL GUARANTEES to give unlimited and efficient Employment Service to students wishing to earn living ex- penses while learning; and to graduates getting started in the automobile field. This is the most any reputable school can be expected to do. 4. NATIONAL’S Training in Every Man’s Reach NATIONAL offers YOU the very beet technical-practical training that money can buy at a cost within every man’s reach. It does not offer to pay your railroad fare, room and board or other personal, expenses, preferring to limit its activities to the PROPER TRAINING OF MEN FOR CCESS. = 5. Come to LOS ANGELES—the Playground of America! LOS ANGELES is the heart of the country’s most prosperous automobile section—as well as the world’s most ideal city in which to live and prepare for : success in the auto game. National Automotive School NATIONAL SUTOSOTIVE. Dept. 729, 4006 Figueroa St., Los Angeles, Calif. Send me, absolutely free, your big illustrated catalog of Automotive Opportunities. PP ccscssece Sannsk¥astdenetes wf | Address. ove j Nathos orn e) ET the same complete, thorough, foundational] training that Lindbergh received. Get it now—under greatly improved facilities—at the Lincoln Airplane School. Much better than when Lindbergh learned here. Get the best train- ing now available. Here competent, experienced instructors teach you practical Flying and Ground Work. You goright up into the sky in our famous Lincoln Page Government Lice Planes—with transport pilots. Learn on actual planes and motors supplied by the Lincoln Aircraft Factory. Write for full information today! LINCOLN AIRPLANE SCHOOL 205 Aircraft Bidg., LINCOLN, NEBR. Learn How to WRESTLE for bosks jet ot giving interesting information your pF moun Advartia Advertising Findon prepare you I Sone Bid on fencinati Pres Real wey. Cg Lit 1a cuatian cvs | . eae ss - dunes: every- where. Just the plan you have always wanted. Write or b ligation. AGE E-DAVIS SCHOOL OF ADVERTISING Dept. 1359 3601 Michigan Ave. hicago, U. S.A. Send for my == STRONG ARMS and BROAD SHOULDERS for 25¢ coin or 30c stamps Tilustrated a4 20 full-page half-tone cuts, showing exercises that will quickly develop, beautify and gain great strength in your shoulders, arms and bands, without any =m Equal to a $20.00 Co Prof. ANTHONY BARKER 1235 Gth A Studio F New York City AVIATION F R 12 E Information Send us name and address for full information oe mo Aviation and | Airplane vue out ey J the many ost ons a je open and ort ~ re gon at bom Industrs”” also sent f veo you aoe oy once. AMERICAN SCHOOL OF AVIATION 3601 Michigan Ave. Dept. 1359 CHICAGO $SBEA LS Sn E OPERATOR Wes ie big money in this easy Bae “demand for trained a we c= ou earn wa nnapine- wat. — in 6-1 weeks. MOVIE ‘OPERATORS scHOOL 61 Sproat St. Detroit, Mich.

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POPULAR MECHANICS ADVERTISING SECTION 29 They Thought I Was Tryi to be Funny — - a oa 7 Until I Started to Play — Then I Gave Them the Surprise of Their Lives violin—beautifully. With mock dignity, I arose. “With your kind permission,” I announced, “I shall now charm you with a piano recital.” Everyone snickered. They were sure I couldn't play a note. ~~ crowd sat spellbound. Harry had just played the “Does he really play?” one girl asked. “Yes,” Phil laughed, “he plays the Victrola—beautifully!”’ With studied clumsiness, I fell over the piano stool. Then I proceeded to pick out “Chop Sticks” with one finger! The crowd laughed. This was the dramatic moment for my surprise. Dropping the mask of the clown, I struck the first sweet chords of Wagner's lovely “ The Evening Star” from “ Tannhauser.”’ The laughter died on their lips. The magic of my music cast a spell over everyone. As I played on with complete confidence, I forgot the room—the people—everything. I was alone—lost in the sheer beauty of the immortal master’s tender melodies. The Thrill of My Life When the last notes had faded away, there was a roar applause. Then came questions and congratulations Pick Your Instrument Piano "Cello Organ Sight Singing Violin Ukulele Drums & Hawaiian Steel Traps Guitar Guitar Clarinet Mandolin Flute arp Saxophone Cornet Trombone Piccolo Voice and Speech Culture Harmony and Composition Automatic Finger Control Piano Accordion Italian and German Accordion Banjo (Plectrum, 5-String or from my dumbfounded friends—“ How long have you been playing?’’—‘‘Who was your teacher?” — “Where did you learn?” “I know it is hard to believe,” I replied, “but I learned at home—and with- out a teacher!"" Then I told them the whole story. “I have always wanted to play the piano. But I never had a chance to take lessons. Then one day I saw an interesting ad. It told about a new, easy way of learning music—right at home—without a teacher. I sent for the Free Demon- stration Lesson and Free Booklet. “When they arrived, I was amazed to see how easy playing the piano really was. I decided that I would send for the course and practice secretly. Then I could surprise you all. Just a Few Minutes a Day “The course was as fascinating as a new game. I enjoyed every minute of it. I was playing real tunes from the start, by note. Reading music was as easy as A-B-C! No weary scales, no monoto- nous exercises, no tiresome hours of practicing. Soon I could play jazz, ballads, classical music—all with equal ease." You, too, can learn to play your favorite instrument by tnis easy “at home” method that has taught over half a million people. It’s just a common sense practical method—so simple you don't have to know the slightest thing about music. You find your progress amazingly rapid because every step is clear and easy to understand. Just pick out the instrument you want to play. The U.S. School of Music does the rest. And its cost averages just a few cents a day! Free Book and Demonstration Lesson Our illustrated Free Book and Free Demonstration lesson explain all about this remarkable method. They prove how anyone can learn to play his favorite instrument in almost no time If you really want to learn to play, take this opportunity to make your dreams come true. Sign the coupon below Instru- ments supplied when needed, cash or credit. J. 8. School of Music, 712 Brunswick Birtg., New York. U. S. SCHOOL OF MUSIC, 712 Brunswick Bidg., New York City Please send me your free book, “Music Lessons in Your Own Home," with introduction by Dr. Frank Crane, Free Demonstra- tion Lesson and particulars of your easy payment plan. I am interested iu the following course: Have You WITTTTTITITITITT TTT TutE.?..cccccccscccsesses NOME. ...ccccccccscccscces eecceses eeeeeccceses eeccccecccece Address. ........+. coccece evccccccecece PPITTTITiTitititiittit CORP . ccccccccccecccvcsccceccceseocs State. . ..ccccces coe .

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ee Am “Pm making real money now” “REMEMBER the day you urged me to send that cou- pon to Scranton? It was the best thing I ever did. “Mr. Carter called me in today. Said he’d been watching my work for some time—ever since he learned I was studying with the International Cor- respondence Schools. “Then he asked me if I could take over Bill Stevens’ job. I told him I was sure that I could— that I had had that goal in view ever since I started my I. C. S. course. “I start tomorrow, Mary, at an increase of $60 a month. It’s wonderful how spare-time study helps a man to get ahead.” For thirty-seven years, the I. C. S. has been helping men to win promotion, to earn more money, to get ahead in business and in life. fou, too, can have the position you want in the work you like best. Yes, you can. All we ask is the chance to prove it. Without cost, without obligation, just mark and mail this coupon. INTERNATIONAL CORRESPONDENCE S SCHOOLS Box 5657-F, Scranton, Penna. Without cost or obligation, please send me a copy of your book- let,-*“*Who Wins and Why,’’ and full particulars about the course before which I brave marked X in the list below: TECHNICAL AND INDUSTRIAL COURSES Architect (|) Automobile Mechanic Architectural Draftsman Aviation Engines Building Foreman Plumber and Steam Fitter Concrete Builder Plumbing Inspector Contractor and Builder Foreman Plumber Structural Draftsman Heating and Ventilation Structural Engineer Sheet-Metal Worker Electrical Engineer Steam Engineer Electrical Contractor Marine Engineer Electric Wiring Refrigeration Engineer Electric Lighting R. R. Positions Reading Shop Blueprints Highway \ crea Telegraph ae QOOOOOOOO0OGO0000RONOUON4 ‘elephone Mechanical a Mechanical Draftsman Machine Shop Practice Toolmaker haf nell Civil Engi inee' iSurveying and Mapping OOOU0UH TOOOoOoOoOoODDODODC —— Pharma Coal Mining Engineer Navigation Iron and Steel Worker Cotton Manufacturing Woolen Manufacturing 0 Assayer Textile Overseer or Supt. Agriculture (1) Fruit Growing Bridge Enz |) Poultry Farming Gas Engine Operating L)Mathematics ([) Radio BUSINESS TRAINING COURSES Business Management [) Business Correspondence Industrial Management [ ]Show Card and Sign Lettering Personnel Management | ]Stenography and Typing Traffic Management LJ English Accounting and L_JCivil Service C. P. Coaching |} Railway Mail Clerk Cicost Accounting [ }Mail Carrier Bookkeeping JGrade School Subjects Secretarial Work [ } High School Subjects Spanish [ French [ ]Cartooning Salesmanship Illustrating Advertising |jLumber Dealer Mi coctibboncewboqueeianteonesnsesooueseesorszecnss . Occupation.... jecttnnanamamneett sienna If you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada POPULAR MECHANICS ADVERTISING SECTION Increase Your Earning Power Apply time and labor-saving kinks to your work. Your efficiency will soon be recognized and you will be in line for advancement. If you do machine shop work of any kind, sheet-metal work, painting, carpentry, auto repairing, farming, con- crete work, plumbing, electrical work, welding, building, glass work, general repairing, tool-making, poultry raising, masonry or home repair work, get this LIBRARY OF 6000 TIME anD LABOR SAVING IDEAS ror SHOPMEN AND HAND YMEN JUST PUBLISHED SHOP NOTES for 1929 224 Pages 347 Articles 400 Illustrations POPULAR MECHANICS SHOP NOTES See partial list EASY WAYS TO DO HARD THINGS of POPULAR MECHANICS PRESS contents below VX. AAV ~POPLLAR AEAMES SHOP NFS 7OR £929 Including the new 1929 issue illustrated above, there are now 15 volumes in the Shop Notes Library of 6,000 easily understood short cuts to every-day jobs. Here are just a few of the subjects taken from the 347 articles in the latest issue. Aluminum Mending Drilling Kinks Practical Mimeograph Artistic Doorplates Jumb Waiter Reamer Holder Artistic Plaques Attractive Lampshades Build Y oe ar Garage Bursts ng C Burning Out c ‘arbon Camera Exposure Meter Candlestick M —_es Chute for Parcel Colonial Spinning Wheel Crane ~~ Smal! Garage Double Vise Press Electric Crucible Furniture Designing Homemade Bilo : nsulating Hot Water Tan Lathe Kinks mg Narrow Photo- raphs Machine for MakingRope Paint Removing Piston Ring Compressor Pneumatic Soldering Removing Roller Bear- ings Renewing Old Pumps Renovating Gaskets Repairing Laundry Tube Rush or Fibre Seats Safe Folding Ladder Six-Inch Bench Shaper Softening Leather Belt- ing Tables in Art Moderne Tin Can Mechanics Draft Regulator Tractor for Light Work i secsessceess SPECIAL OFFER COUPON :s2eeescee: Each volume contains approximately 500 articles and 400 illustrations and has 224 Pages. At the regular price of 50 cents per single volume this library costs 37.50, but for a limited period we will supply the 15 vols. r+ g-§ ordered at one time at the special reduced price of only $4.5( POPULAR MECHANICS PRESS 200 E. Ontario St., Room P12, Chicago, tn. Send me, as = your special offer, the following books. I will pay for bouks C.O.D. when they arrive. My money will be refunded if 1 am not satisfied. (Check what you want.) 1 1929 Shop Notes and Lathe Handbook, both for 98c. () Complete Shop Notes Library (15 vols.) $4.50. Vo | a

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pay ded inside trade information at his fingers’ e well informed. To earn more, learn more. sive course for the ap; worker. A 4 Be chalk line; How to use| to build ho rules; How to make joints; Car ensure arithmetic: tion problems; Estimat- POPULAR MECHANICS ADVERTISING SECTION possibilities of your profession. Any job can be done better if you are for pages; Sa! — 5, ideas, solutions, ise. A pe yourself, sim, pip aif inr'an and ‘nail the FREE COUPON bel INSIDE arages bungalo ° galow $ How to read draw plans; up specifications; How 31 OCKET, ,EDUCATORS BUILDERS” MECHANICS Read Audels Pocket Educators for advancement and your work. Every mechanic in the building trades should rofit in ave this Learn the scope and AUDELS CARPENTERS AND BUILDERS GUIDES—4 VOLS. $6 Mechanics—all W604d- a instructions, new systems—m ms. An easy progres- A tical daily. helper and ana Oeiek Be Reference for the master er and Better Work and Better Pay. To get this aid for low. ‘ters, Byliders, Joiners, ny Ty 4, >. excavate; How to settings 12, ae one and ea on the steel sq How to build h hoists and pet fee AE How How to put vs 3 interior and trim; ow Drawing doors; Howtolath—iay floors; How to paint. AUDELS PLUMBERS AND Master P! Sheet Metal W ~t. oN Students. 1670 pages A new a +. A ny | illustrated, Ref ourneymen and c— = ples, advances en ont = = ‘of the Plum bi jo! ns on how to vhf vai out obligation, th’ siuable work work TRADE a ay pe ON: ine ins: antes. | ‘aon qb tanks. lation, refrigeration. Joint wi ben % Drainage, sewage, puri- Water apply, mains, beat: be—troa-— fica’ Fixtures— | wells, tan Gas-fit- beth kitehen. —_ tings. Underwriters. jis, = fit soil pipe, too Sheet meta! work, prob- aterials——iron,| Laying out work. | lems, methods,Brazing, per, brass, hing. Screwed fit- heating, lead burning. . antimony. Saas, _Sanees. joints. | Welding, various welds, metal — galva- =, ing, examples. | methods. Blacksmith- nized—plate. Sanita-| Elbows. Heating, ven- | ing, forges, tools. GUIDES—4 VOLS. $6 erence Library , ee ie for Apprentice Steamfitters, Gas Fitters an aoe ie Builders, Engineers and all Bul a Tpade flexible; _— size. Guides |] all the Contains instruc- po and Heating trade. ibs. Use FREE COUPON below to examine, with- A new, complete, il ted and mor- "Tile ootting. pA “bellow $ ile: Straight edge test, oom lustra‘ e Setters and Stone arene. 1100; pages; 2067 Seomes Texibies pocket s! — modern methods of masonry construction. reliable and authentic reference work I study-course for Master Journeyman and Young Mechanic. Use FREE COUPON tables; Concrete, forms; How to figure concrete work ; Stucco—on old and new buildings; Plasteri wood lath — metal; AUDELS MASONS AND BUILDERS GUIDES—4 VOLS. $6 trade reference 2, ibeary. for — ers, Cement Workers, ns, luding a practical outline of Steel Con- Easy to understand and apply. A low and ana out for your- self, without obligation, whether this set will benefit you. a best aie en hy INSIDE Laggeord INFORMATION ON: am shle to judge.” WA-Bene Bricklaying, tools, ma- | eling; How to figure brick | Plas tere reement; | Cediiss coe 5 designs. pat ae : rae piers, pe bd a sur- e rns, n ing | chimneys; ngs, ” frames and foundations: | anchors, fire stops; Labor | £#°¢8:Stonemasonry;Cut- . finishing, estimating stone; Derricks, rigging; Steel construction; Fire proof; How to read biue prints. PRACTICAL ELECTRICITY — 1 VOL. $4 Audels Handy Book of Practical Electricity is a simplified Read Reference and Study Course in one ket size, leather bound vo ume—for Engineers, Professional Fl —— —~" and Students. 1048 pages fy and | You 2600 d red i bound. A reliable authority an handy hae for every electrical worker. Contains important and valu- able wiring diagrams, calculations, Complete in one machine | sketches helps on mainte- dy, red leather . Use this FRE bound volume COU! PON d find out, with: out obligation, Low a this handy book will help you in your daily work. INSIDE TRADE coe enon ON: Electro-Therapeutics -Rays, Shocks, Welding, sate at Hook-ups, Mo on phone, Telegrap clevators, Penge. Railways, V: ehicles y enti Pia , nition, carn ing, Plan anagement, Power Plans, Armature Win R Motors and Apparatin, o C. aacsere and i tus, Alternator Construction, Dynamos. Diagrams, Sign Flashers, Cable Bolicing. Power Wiring, Outside Wiring, Switches, Light- erters sformers, Ss, Static, Dynamic, Radio Electricity, Applications, Ready Reference and Index Covering the entire field of Modern Electricity. Learn More and You Will Earn More! Knew your job and you'll never be without one. The skilled man is always in demand. Knowledge is Learn your trade = hly by easy reading. Tul'cou- is szour tisk nothing in et ‘or advancement and better p: eo] for Audels Guides for res Tiaa THEO. AUDEL & CO., I nee cs W. 23 ST., NEW YORK cITY Please mail me for free examination : UPON the boeks marked (x) below. If I find 4] them satisfactory, I agree to mail $1 in days, on each set ordered, and to further mail $1 at monthly 9n each set until I have paid the purchase price. pLietioes se|L) aviv t's 3% GUIDES UIDES $6 I] 4 MASONS |] HANDY BOOK s4 ‘ GUIDES $6 HANDY BOOK %4 § NAME So eg hbdkhh cess ubecdatetnsdbasuae 8 .ppress isin pleats eeeeeeeeee Sf SSS UP TIEN + asa ccssreeveasospoeese B EMPLOYED BY...........csceceeeeseeee0-12T30

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32 POPULAR MECHANICS ADVERTISING SECTION Earn’75 to’l00 a Week as AUTO MECHANIC — Eight short weeks of pleasant, fascinating, practical Auto, Airplane or Tractor work in my big shops—and then a real job paying $75 to $100 a week! You can step right out of low pay, long hours, and no fature into the job of a high-salaried trained mechanic. Everywhere jobs are waiting for men trained as I train them. Change the whole course of your life in 8 weeks! Learn on Real Machines— No Books Come to my shops. I will make you a mechanic able to handle the hardest mechanic's job easily and quickly. I'll teach you to know Autos, Airplanes and Tractors iaside out. You don't nesd education. You don’t need previous = All you need is ambition. You learn by doing—by work on_ actual machines with real tools. is not a correspondence course. (No facilities for colored students.) Short Cut to Bi Pa Learn how easy it is to get a steady, bi 9 Y pay job in the great Auto, Tractor an Aviation fields. Learn what other fellows like you have done with McSweeny training. Get special low tuition offer. tat agg mee. Tanatee and ietthe ‘hoo is, = , ester at it | Cieveland, abe: oF 263 Madison St., Money Back Memphis, T: Guarantee Without paige or r gianecsia, send me your big FREE Book on Autos, Tractors and Aviation, also full details of your special tuition offer. If, after com- pleting my training, you z are not satis- PEE neh eceverncccecrcccvcsvoceseccesoece fied, if you s are not qua PEED bb oweesevctcsecccdcctccescocecooeess accept . big- pay job, your tie deddcacecde coc BtAte. .cceeesees tuition will be refunded. In 8 Weeks You Can Have a Big-Pay Job as an Auto, Airplane or Tractor Mechanic Mail Coupon for Book Special Aviation Course AVIATION is paying seomensous ineomes to trained m Learn on real aisaiens engines un- =: experienced instruc- able opportunity. Auto, Tractor and Aviation Chester at 30th St., or Cleveland, O. 263 Madison St., Memphis, Tenn. Aircraft Drafting Now taught at home/ The demand for trained Aeronautical Draftsmen is so great that the famous old Columbia School of Drafting now offers a special Aero- nautical Course. Under the new home study plan, non-resident students get the same instruction as those who come to Washington, receive the free services of Columbia's active employ- ment service. The coupon will bring you our mes- Sage to wide-awake mea, “‘Drafting and Its Oppor- tunities.” Send for it today! Columbia eet of Drafting & Engineering Branches of Drafting 13th and f Sts., N. W., Washington, D. C. P. M.-12 Please send me my copy of your a Book, showing how I can learn Aeronautical Drafting right at home. SENT ON REQUEST Helpful discussion of this important roblem and of fastest growi of echanical Trades — Mechanical n- tistry. Easily learned. Of interest to men of all ages. Send for Bulletin 2. BODEE Ptgtnle? stag 6s 1755 Broadway, New 1305 N. yl m., Piiadelphia 85 Court St., Br ookly: [ “STAMMERING |fs Guuse and Gre * You can be amiaiiy cured ifyoustammer. Send 10 cents coin; or stamps, for 288 page cloth bound book on Stammering and Stuttering. It tells how I cured myself after Stammering and Stuttering for 20 years. BENJAMIN N. BOGUE 11124 Bogue Building, 1147 N. til. St. indianapolis e 48. Mlustrated —— POSTAL CLERKS rapid advancement. Many ¢ ome US. country residents stand same chan: MAIL CARRIERS—POSTOFFICE CLERKS GENERAL CLERKS—CUSTOMS INSPECTORS $1700 to $3400 a Year for Life No “lay-offs” because of strikes, PPR" cove business, i Jobe mba ct & + 7 overnment Jo ty ani "MEN—BOYS 18 to 45 Use Coupon Before You Lose It] COUPON FRANKLIN INSTITUTE, Dept. D173, Rochester, N. Y. STEADY V WORK Cut coupon and mail it before turning the page. ush to me, free of charge, (1) A full description of the posi- tion checked below; (2) 32-page book, with list os ———— obtainable ; aay Tell me how to get the position c C)Railway PestalClerk ($1900 to $2700) CiGenersl Clerk (si260t0 10 $2100) ()Pestethee Clerk ($1700 to $2300) (Customs Inspector ($2100 up) { COGity Mail Carrier ($1700 to $2100) (Rural Mail Carrier ($2100 to $3300) | Name sesesesee ses ccentese 90000 cceceeoncoseccoesocscontes

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POPULAR MECHANICS ADVERTISING SECTION 33 “Grasshopper Mind” OU know this man as well as you know YOURSELF. His mind nibbles at EVERYTHING and masters NOTHING. At home in the evening he tunes in the radio—gets tired of it—then glances through a MAGAZINE—can’t get interested. Finally, unable to CONCENTRATE on anything, he either goes to the MOVIES or FALLS ASLEEP in his chair At the OFFICE he always takes up the EASIEST thing first, puts it down when it gets HARD, and starts something else. JUMPS from ONE THING TO ANOTHER all the time! There are thousands of these PEOPLE WITH GRASS- HOPPER MINDS in the world. In fact they are the very people who do the world’s MOST TIRESOME TASKS—and get but a PITTANCE for their work. They do the world’s CLERICAL WORK, and routine drudgery. Day after day, week after week, month after month, year after year—ENDLESSLY—they HANG ON to the jobs that are smallest-salaried, longest-houred, least interesting, and poorest-futured! If YOU have a “grasshopper mind’’ you know that this is TRUE. And you know WHY it is true. Even the BLAZING SUN can’t burn a hole in a little piece of TISSUE PAPER unless its rays are focussed and concentrated ON ONE SPOT! A BRAIN THAT BALKS at sticking to ONE THING FOR MORE THAN A FEW MINUTES surely cannot be depended upon to get you anywhere in your YEARS of life! The TRAGEDY of it all is this: you know that RIGHT NOW you are merely jumping HERE AND THERE. Yet you also know that you have WITHIN YOU the intelligence, the earnestness, and the ability that can take you right to the high place you want to reach in life! What is WRONG? WHAT'S holding you back? Just one fact—one SCIENTIFIC fact. That is all. And when you know what it IS, then you can easily learn how to apply it; make it carry you STEADILY, POSITIVELY, AND DIRECTLY to prosperity and independence. That fact is one which has been PROVEN and stated by the world’s foremost scientists and psychologists. You are only ONE- TENTH as successful as you COULD be! Why? BECAUSE, as Science says, you are using only ONE-TENTH of your real BRAIN-POWER! TEN per cent of his ‘brain is all the AVERAGE person uses. He is paid for ONE-TENTH of what he really possesses because that is all he actually USES. The remainder lies dormant. The longer it is unused, the harder it becomes to use it. For the mind is like a muscle. It grows in power through exercise and use. It weakens and deteriorates with idleness. What can you DO about it? That is the question you are asking yourself. Here is a suggestion. Spend 2c for a postage stamp. Send in the coupon below for @ copy of “Scientific Mind Training.’’ There is no further obliga- tion whatever. You need not spend another penny. This little book will tell you the secret of self-confidence, of a strong will, of a powerful memory, of unflagging concentration. It tells you how to acquire directive powers, how to train your imagination (the greatest force in the world), how to make quick, accurate decisions, how to reason logically—in short, how to make “Ought to put over that Money- making Iden ey > ksi = your brain an instrument of all-around POWER. It tells you how to banish the negative qualities like forgetfulness, brain fag, inertia, indecision, self i , lack of ideas, mind wan- dering, lack of system, procrastination, timidity. Men like Judge Ben B. Lindsey, Sir Harry Lauder; Prince Charles of Sweden, Jerome K. Jerome, the famous novelist; Frank P. Walsh, Chairman of the National War Labor Board, and hun- dreds of others equally famous, praise the simple method of increasing brain power and thought power described in this free book. OVER 650,000 OTHERS PRAISE IT. You have only TWO CENTS to lose by writing for your copy. You may GAIN thousands of dollars, peace of mind, hap- piness, independence! Thousands who read this announcement will DO NOTHING about it. The effort and the will needed to send for this book— which is FREE—may be lacking. How can these people EVER gain what they hope for, crave for? They are the skeptics, the doubters, the ‘‘show me”’ wiseacres. Other thousands will say, ‘‘I can lose only TWO CENTS. I may GAIN a great deal by reading ‘Scientific Mind Training.’ I will send for it NOW. It promises too much for me to RISK MISSING.” The thousands who are open minded—who are willing to learn something to their advantage—will ACT on their impulse to send the coupon. They will be better, stronger minded for having TAKEN SOME ACTION about their lives, even if they do noth- ing more than to READ a booklet about the inner workings of the mind. For your own sake—and for the sake of your loved ones, don’t continue to GAMBLE that your future will be bright whether or not you DO anything about it! Mail the coupon today —NOw. THE PELMAN INSTITUTE OF AMERICA Suite 612. 71 West 45th Street, New York City Offices in London, Paris, Stockholm, Delhi, Durban and Melbourne The Pelman Institute of America Suite612. 71 West 45th Street, New York City send me without obligation your free booklet, Please “Scientific Mind Training.’”’ This does not place me under any obligation and no salesman is to call on me. Addresa City State.

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34 POPULAR MECHANICS ADVERTISING SECTION cep INTO A BIG“PAY HOTEL Earn $2,500 to $10,000 a Year N America’s 3rd Largest Industry. Hotels, Clubs, Restaurants, Insti- tutions, Schools, Hospitals, etc., are daily calling for Lewis Graduates. Over 70,000 high-class positions paying $2,500 to $10,000 a year open annually in hotels alone. Salaries up to $3,500 to start. W. Ryder says:—*‘Shortly after completing your course I was appointed Purchas- ing Agent of a chain of hotels at a 100% increase in salary.” We Put You in Touch with Positions Without cost let us show you how big pay, fascinating work, quick advancement can be yours in the great hotel industry. Age is no obstacle—young and old alike have equal chance for success. O. O. Miller, 55, qualified for a well-paid position thru the Lewis ‘ eourse. ~ A common school education is all you need with the amazing Lewis System of Sparetime Training in Hotel Operation. Previous Experience Unnecessary u tn Stee t: ew ents : “Made Good” Hundreds of Lewis students are Charies.A. Jones:—"I winning success. Totally un as chosen acquainted with hotel work before mition of Manager. taking the Lewis Course, N. Frank Hills is now Assistant Manager of a $250,000 Apartment House. YOU can do as well. Low cost— easy terms—money back agree- ment. Write to- day for Free Book, “Your Big Opportunity,’ and complete details, mailed without Qetinjme uae) obligation. arce of the ust think, I haven't been in the work a year and yet I fully understand what wi be required of me, thanks to Lewis Training.” LeRoy L. 8 Sistant to the T sronnaee Thank you raining lor your cooperation Morris 8. Johnston— Schools ‘I am Manager of -; the finest hovel of its Room BU-339 kind in this city. n Your course is essen- tial to work.” D. Cc. Seen eencan LEWIS HOTEL TRAINING SCHOOLS, Room BU-339, Washington, D. C. Send me the Free Book, ‘Your Big Opportunity,”’ without obligation. OPPORTUNITY COUPON "60. 150 WEEK MOTION PICTURE OPERATORS EARN THIS - and MORE Big Pay — Easy Work — Short Hours yo can quick!y qualify for one of these well-paying positions. Big demand now for motion picture projectionists—in theatres, schools, industrial motion pic- tures or for spare-time entertainments! Our complete home study course teaches you everything—dqualifies you in short time for big pay and fascinating work. Earn two to five times your present salary in this growing, uncrowded profession. FREE BOOK shows you how you can easily and quickly qualify as an Expert Motion Picture Operator. Send for it TODAY—NOW! NEW YORK INSTITUTE OF PHOTOGRAPHY Dept. D-1418 8 West 33rd Street NEW YORK CITY Big Money for You as an Automobile Mechanic These four practical books, written by five well known teach- ers of automobile practice, will teach you right in your own home during your leisure time just what you need to know about automobile troubles and repair. They will teach you automobile construction, maintenance and repair as practiced by experts and will help you to earn an expert's pay. Practical Automobile Library: Four Books—$1.50 in 10 days and $2 ithiy for 6 ths—only $13.50 in all! Hundreds of question-answering diagrams—hundreds of clearly- marked illustrations—make the books plain and readily understand- able. All the explanations and descriptions are clear, simple, direct. Every chapter is packed with definite, step-by-step, how-to-do-it information. Here is your opportunity to enter a big-pay field. Send No Mone FREE TRIAL Mail the Coupon FREE EXAMINATION COUPON McGRAW-HILL BOOK CO., 370 Seventh Ave., New York Send me for 10 days’ free examination the New Practical Avtomobile Library If satisfactory, I will send you $1.50 in 10 days and $2.00 monthly until the special price of $13.50 is paid. If not wanted, I will return the books at your expense City and State... 2... ec cceeeeesscece Position. . Employer PM-12-29

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POPULAR MECHANICS ADVERTISING SECTION { Club House, Office and Air Depot, — Fas Sky Harbor, Chicago Steel and Concrete Hangar, Sky Harbor, Chicago OW is the time to get into aviation—learn to fiy at Sky Harbor the finest flying field in the Middle West. Training on latest type training planes with air cooled motors similar to those used in the Army. Advanced training on Fokker and Tri-motored Ford. We fly at Sky Harbor all winter. sm oe entacf Complete mechanic’s courses covering every phase of aerodynamics taught at our big down town building— six floors of equipment — everything needed for finest instruction. Training given on latest types of motors, including Whirlwind and other air cooled radials. ‘b4 . . . . , ie th; he TF SS ae Br ow 2 — Welding, navigation, meteorology, construction, and —— tae AS motors are included. Mail the coupon today for Sky Harbor Flying School—Six Floors of Equipment complete information. Be sure to investigate Oe fi ees eR See Harbor before you pick your flying school. , = S. Micuican Ave., Cuicaco, Ii. Please send me complete information on the course j checked below: D Private Pilot's Course. © Complete Airplane SKY HARBOR FLYING SCHOOL 1 pee, Pilot's = ae Mermenis’s Course. DEPT. M = —_——— 1801 S. MICHIGAN AVENUE _— CHICAGO, ILL. + NAME ~~ Pao tae SR

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36 POPULAR MECHANICS ADVERTISING SECTION A DOLLAR BILL TO THIS—: I'll Teach You To Dance —at home without music or a partner or the Trial is Free ES—I'll teach you in a few hours—at home—in private— how to learn all the modern dances—Charleston, Black Bottom, Valencia, Canter, French Tango, St. Louis Hop, Latest Waltzes, Fox Trots, etc., or the trial costs you nothing. I'll train you to be an easy, confident dancer by a system so clear, so simple, so complete that you will soon start dancing gracefully—even though you've never danced before. Dancing Made Simple as A-B-C You‘will be surprised to see how easily you can learn to dance by our simple chart system. Every dance is explained step by step with charts and diagrams. You can't ssibly go wrong. The directions are so easy to follow, and the pictures are so clear, that you'll be dancing before you know it. It isn’t necessary that you understand music or even have a piano, phonograph or radio. Our remarkable system teaches you a very simple system of timing yourself. It tells how to know by the music what kind of a dance is next, how to start on the right t, how to follow the music, how to be graceful and feel at ease, how to get rhythm, how to lead or follow, how to stand correctly, how to gain confidence, how to become popular. In fact, in a short time this remarkable course should make you one of the best dancers in your set. If you want to become a perfect dancer—if you want to be popular—learn to dance at home this new, easy way. Think of the Good Times You Are Missing Every time you turn down an invitation to a dance, you are missing hours of fun, enjoyment and pleasure. Dancing 4 Ly best of the social accomplishments. If you are a good da you will be the most popular person in your set and get in« “tations to all the parties. A not learn to dance and share the splendid } others are enjoy Try for 5 Days FREE Just send your name and address and we'll send the complete course—323 es, 49 illustrations, by return mail. When the postman hands you the book, pay him only $1.98, plus the delivery charges. Try the course for 5 days. Then if not satisfied, return it and your money will be refunded. Mail your order now! — eee ee —_——— Franklin Publishing Co., Dept. 9423, 7 800 N. Clark St., Chicago Please send me your eomplete course—" Dancing Made Easy” —~323 pages, 49 | fiustrations. When the book arrives I'll pay the postman only $1.98. p!us delivery charges. If I am not eat'sfied after 5 days’ trial, | may return the book and you | are to refund my money. If you are likely to be out when postman c: oP livery charges. = ee ee ee ee ee 2 = i — AMM. cecccacccesecses >. is, send $2.00 with coupon and we’! Customers outside U. 8. mest send cash with order. | ae ee | Get this genuine leather 5 window card case, with gold corners, Ma- sonic emblem stamped in heavy gold. Your name or other stamping per line. Money back guarantee. 9 windows $1.50. 13 windows $2.00. ANovel Charm A most mysterious watch charm of heavy Shows the Square and C 35c extra, thing different. C) Ne. 10, C)Ne. 11, Established 1859 ss Redding Masonic ‘Supply Co. 200 Fifth Ave. Packed in an attractive box. Catalogue suggests many other gifts . * Just_the right size. Latest style. A lasting remem- brance and an appreciated pres- Please send catalogue “* Everything Masonic’’ latea gold. ompass when revolved. Some- $4 00 SOLID GOLD PIN ent. Large variety —Masonic, Chap- ter, 32nd egree, Shrine, Grotto, O. lies §.8., DeMolay. - $1.00 Dept. P. M., New York Civil Engineering 9 great volumes. 4€00 pages. S000 illustrations. the press, by off twelve of America’s reatest engineers. ncludes: Surveying, bridges, railroads, steel structures, mu- building, etc. Loaned Free! To prove you can learn Civil Engineering at home in your spare time. And be- cause no description here could do it justice, to let within your reach Sen: no money—just mail the coupo: >>> > a Year—and Up! “CIVIL ENGINEERING™—in plain English written so you can understand = even if you have only a limited education. Prepares you for « well id railroad structural or public works position Sovers every branch of Civil Engineering pr At once a reading course for the ambitious st and an authoritative reference work for tt perienced engineer. Borrow a set—free. Look over the test questions which help you master each subject _ Mail the coupon without o/diga- Am an Technical Society Dept. C-919 Chicago American Technical Society, Dept. C-919, Chicago I want to BORROW the CIVIL ENGINEER: ING Cycteperte for 15 days FREE gladly pa 4 cents express, but I am =. may nothing for the | — of the 9 big volumes if return them wit 15 day wish to keep them I will send ves $2 alter the 15 days, then 33 a month until special advertising price, $34.80, is paid. NOM, oc ccsccscccccccccsccccccecsesess Address. (Attach letter stating age, occupation estat and references’ names and addresses.) T P C ie a hae sl -~ 3

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—O J 3 Radio Inspectors $2000 to $4500 a Year. kK Radio Operators $90 to $200 a month (board free). POPULAR MECHANICS ADVERTISING SECTION Broadcast Operators $1800 Radio Repair Mechanics $1800 to $4800 a Year. to $4000 a Year. ll one of these BIG MONEY RADIO pick yourself a big-money job in Radio! Hundreds of men just like you earn from $2,000 to $25,000 a year in this giant world-wide industry . .. The livest money-making business of today! The whole world is calling for trained tadio men. Broadcasting stations and manufacturers are eagerly seeking trained men. Thousands of oppor- tunities are waiting for you. Easy to Learn at Home With This Magnificent Laboratory Outfit The Radio Corporation of America sponsors this marvelous, simplified home-training course +++ by means of which you can prepare for suc- cess in Radio. Learn by actual experience with the remarkable outlay of apparatus given with this course . . . You, too, can easily have the con- fidence and ability to hold a big-money Radio job. Only Course Backed by Radio Corporation of America The progress of Radio is measured by the accom- plishments of the great engineers in the Radio Corporation of America. This gigantic organi- zation sets the standards for the entire industry -++.and sponsors every lesson in the course. That’s why graduates of this school are always posted in newest up-to-the-minute developments in Radio and are always in big demand. Money Back if Not Satisfied This marvelous home-laboratory training prac- tically insures your success by preparing you (Gonsonss 7) RADIO INSTITUTE of AMERICA RCA man e JOBS 2% Q months @ FREE BOOK SHOWS HOW! thoroughly in every phase of Radio manufac- turing, servicing, broadcasting, photoradiograms, television and airplane radio equipment. As a student you will receive an agreement signed by the president of this school assuring you of com- plete satisfaction upon completion of your train- ing—or your money will be instantly refunded. Read This Free Book The young men in Radio today will be the industrial leaders of tomorrow... that’s what happened in the automobile business ... in aviation ...and in every other essential in- dustry ... Get in on the ground floor and climb with this tremendous industry ree...everything you want to know about Radio ... 50 fascinating pages . . . each one packed with pictures and descriptions about the brilliant opportunities in this fast- growing profession. See for ourself why R.1. A. training as placed thousands of men in well paid positions—usually from 3 to 10 days after gradua- tion. Mail this coupon now and receive your Free Book. RADIO INSTITUTE of AMERICA Dept. P.M. 12, 326 Broadway, New York, N. Y. Gentlemen: Please send me your FREE 50-page book which illustrates the brilliant opportunities in Radio and describes your laboratory-method of in- struction at home ities tilp a cerctrccernannerinncseinsesnnnennansntevinemnnnenietnsinutteuiaitips

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38 POPULAR MECHANICS ADVERTISING SECTION BARBERING Now One of the Highest Paid Professions! $ Every Week! Qe a “1 so to Earn! That’s BARBERING for YOU! And the best part of it all is this—scientific barbering, as taught the modern MOLER way, makes YOU a Master Bar- ber in a short course of intensive training, at small expense! You soon step out as your own Boss, if you wish, in your own Shop, which we will gladly help you equip. MOLER Graduates are Always Busy! @ MOLER trained Men are always given the prefer- ence, for they alone possess the valuable, thorough MOLER training in the application of all the latest scientific Barbering methods, including the Electric hair cutter, the me- chanical massage, and the latest vogues in ladies’ hair bobbing. MOLER also gives special training in ladies’ marcelling and an easy practical course in the treatment of skin diseases. EARN WHILE LEARNING! “Where there's a Will there's a Way" to earn BIG pay! Write to the nearest MOLER College, there is one near you, and learn how you can earn while you learn the barber trade. Ask for the new FREE MOLER Barbering Booklet B. Find out HOW MOLER helps you help yourself AFTER you grad- uate, as well as BEFORE! Find cut why MOLER Men are making DOUBLE the money others made last year, before ies’ Shingle Bobbing became so popular. You're NEXT in line for big pay—the MOLER way. Send Coupon TODAY! Standardized Branches Moler System of Colleges 139 E.23rd St., New York City. 109 S. 15th St., Omaha, Nebr. 512 N. State St., Chicago, Ill. 501 E. Water St., Milwaukee, 810 N. 6th St., St. Louis, Mo. Wis. 801 Main St., Kansas City, Mo. 206 E. 4th St.,Cincinnati, Ohio. 215 Huron Road, Cleveland, 10. 559 Michigan Ave., Mich. 81 Forsyth St., N.W., Atlanta, Ga. 81 S. Second St., Detroit, Tenn. 912 Main St., Dallas, Texag. Memphis, Address Nearest Branch Please send me without obligation on my part your Booklet B. “Bine the President, Chicage Technical College, Dept. RIT, Lib East 2etnstrece, Chicago, 1. ELECTRICITY ING W ELD eemonsil PRACTICAL TRAINING ON MASSIVE LAY-OUT OF ELECTRICAL EQUIPMENT Aircraft Oxy-Acetylene and Electric Welding, Armature Winding, Power Plants, Switchboards, Transformers, Motors, Generators, Batteries, Radio and Automobiles. Write now for Free Catalog. Coleman Electrical School, 1628 Main St., Kansas City, Mo, STUDY AT HOME Become a lawyer. Legall rained men win in bigh Tet corpora- > men ite h legal be fvidence ~ Univ a Dept. 1264-S, Chic The Wortd’s Largest ining bh ase lcamnet fodiens Census Clerks, Clerk Carriers, Rural Carriers, Rail- = Mail Clerks, Postmasters, Department Clerks, many others. Splendid’ salaries, easy work, pene. with pay. Only common school education required. Examinations often. 37,976 appointed last year. Send for our Civil Service Catalog : OLUMBIAN COR- RESPONDENCE COLLEGE, Washington, D.C. GOVT POSITIONS 10°75 WEEKLY HY ae Mail Clerk Steno-Typist Sropieon Agent Immigrant Inspector () ) ler ) Special Agent ) vestigator) ) etary City Mail Carrier ( ) U.S. Border Patrol i eer OOOO OO ~ OZMENT INSTRUCTION BUREAU, 111 Arcade Ride., St. Louis, Mo. Send me FREE particulars How To Qualify for positions marked ‘*X’’. Salaries, loca- tions, opportunities, ete. ALL SENT FREE. §$°%%?l ADV a ee ee ee eet et > ae a a

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lerks, work, juired, nd for D.C. POPULAR MECHANICS ADVERTISING SECTION TIsTy —— and be your own boss you like to draw, why drudge when success and a good income may be yours through art training? Publishers pay millions of dollars yearly for illus- trations. Many successful Federal Stu- dents are earning from $2500 to $6000 a year — some even more. If you hold yourself down to a rou- tine job you may always do uncongenial work. But if you like to draw and are willing to train your talent, your art ability may help you to success in life. Through the Federal Course in Illus- trating more than fifty famous artists give you the benefit of their methods of Illustrating, Cartooning, Lettering, Poster Designing, Window Card Illus- trating. You may learn through the ex- perience of these successful artists how to bring your own drawings to a pro- fessional standard. They understand the methods that make art pay well. You can keep your present position while gaining your art training. Through the Federal Course you learn FEDERAL SCHOOL OF ILLUSTRATING 12139 Federal Schools Building Minneapolis Minnesota at home in your spare time. Hundreds of Federal Students have already prov- ed by their professional success the value of this home study instruction. Vocational Art Test—Free Find out about your drawing ability by sending in the Free Vocational Art Test we offer. Just write your name, age and address on the coupon and we will send this Test together with a copy of the book “‘A Road To Bigger Things” without charge or obliga- tion. Why drudge at uncongen- ial work when the chance to plan your own work and be your own boss may be yours through Art Training? It is im- portant that you take your first stepoutofthe rut by mail- Federal School of Illustrating, 12139 Federal Schools Building, Minneapolis, Minnesota. Please send me free book, “‘A Road To Bigger Things,” and Standard Art Test. . Occupation.

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40 POPULAR MECHANICS ADVERTISING SECTION

400,000 miles of flight are behind the training Hinton gives You HAT’S more, Hinton’s hundreds ; of thousands of miles in the air is only one side of his remarkable ex- perience. The things that so many other star performers lack—the thing that makes Hinton what he is today, a real Maker of Men—is his ability to share his knowledge with others in a clear, simple, interesting manner. As proof of that, consider Hinton’s record during the war. He was one of the crack pilots singled out by the U. 8. Navy to instruct recruits. Under his capable, seasoned eye, hundreds of new- comers learned — P’s and Q's of Aviation; made their first excursions into the clouds. New’s the Ideal Time to Get Inte Aviation Fe business + ay ine tohen to the - m earnest. Mail and passengers fly to pate — a orth from coast to coast. Forty-five operat- meric&, ing companies are now fyin 70,000 first to use the Airplane miles a day on regular schedule! The in Exploration, first development in the last three years has world- ee flyer to m amazing, astounding—and yet, an train men at home for Official publication says, ““There is every big jobs in A ti reason to believe that the immediate £4 i viation. future will bring forth even greater The facts about this accomplishmente.” remarkable course and to get started—NOW is the time to get this real result-produc- your training—NOW while Aviation is ing employment service YOUDS — NOW while the demand for are yours for the asking trained men is at its greatest.

WALTER HINTON First to fly the Atlantic, in his Get Your Ground Work Where You Are— At HOME Hinton will train you right at

home in your spare time. His famous course takes you over a plane inch by inch; shows you all about construction, rigging. motors, instruments, theory of fight. air navigation—EVERY- THING. When you graduate his nation-wide employment service helps you to get the kind of job you want; or, if you want to fly, he arranges special rates for you at accredited fly- ing schools. Send for his book today, and learn the FACTS. Walter Hinton, President, rey om Institute of U.S. A., 115 Connecticut Ave., Na D. C. Please send me your Free Book, “Wings of Oppor- tunity,” showing how I can get my Ground Training right at home and quality for Aviation. 301-B City State me me eee

Poor English. How much is it costing you in wasted opportunity? your associates u hat guy ond oe pen uuy tt lis Hazy ideas sae ets lschowen word Aw ag bong mark a man as 3 in n thinking. ‘Thoughts < a words rds that give rue shape and color, sentences aflame with power and originality. —these are the things that proclaim ability, that win for Bar pe = : top ‘d ‘or poor _ . inexcusable! In the a “7 o bome—with LaSalle iis you can learn to on) write with real distinetion learn tomakethe wales utter and the letters you com: : oy pr a ‘Complete in 5 ts details in an attractive 82-page book." Bffec seiness

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o” Lecture Cours Complete ind ‘Volume NO MONEY Every foreman, tactory worker, manager and ambitious mechanic ay find agold mine of inside information in “The Modern Foreman” y Robt. Grimshaw. The 28 chapters of this great work are shop ine pointing the way to success, efficiency, better an and the job higher up. A complete study course in leadership; a handy, daily reference and guide. SUBJECTS COVERED INCLUDE: —The Magic Wand of Efficiency, The New Type of Foreman, Teamwork, The icker, e Agitator, Bonus Plans, Self-Improvement, How o Hand te ns Hiring and Firing, Assigning Men to Jobs, How to K Records, How to Cut Out Waste of Time and Materials, New Inventions, Modern Methods, The Inspector, Health and Character Requirements, What the Foreman ould Know, Mathematics, Business Law, The Foreman as eant,”’ Factors of Success, Leadership, What is ‘‘Labor’’? Time and Idleness, Knowledge is Power, *‘Morale,” The Value of Mistakes. “The Modern Foreman” has 297 pages, quick reference index, many tables, diagrams, illustrations and forms; big type, easy to read and understand; rich He a gold stamped. Size6x9x14. Reg. price $2.50. Our ones sale price $1.98. Send no money. “Satisfaction guaranteed. ail this coupon TODAY! See eee eee ee eee ee ee ee ee GREGG ‘PUBLISHING CO., 20 W. 47 St., New York, N. Y. Send me “The Modern Foreman.” I will pay postman $/.98 and Postage on arrival. My money is to be refunded if I am not satisfied.

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This © BOR anRaaealTs iT? sells LESSON GUIDES Tns, Lesson guides are mailed at ine regular intervals to direct le! and outline the study of the Course. ich, — ZA, LECTURES Z A The Coursecontainsa series of printed lectures written by outstanding national au- thorities on subjects not or- dinarily found in law END books. ° NEY hanic 25-volume standard size law library is provided to all at the time of enrollment. The Aristocrat of Training Programs LAW TRAINING=SUCCESS 1S message is directed to the man who is contemplating the study of law— And where is the man who has not at some time yearned for law training the certainty of success it brings? The Aristocrat of Studies Law is the aristocrat among training courses. Law students are stamped as men of discernment and dignity. They are looked upon with respect. A knowledge of law enhances earning wer and helps to win advancement. The demand for men trained in the law is growing constantly. or years the Blackstone Institute, through its professional home-study law course, has been meeting and satisfying this demand. Today the Institute can point to more than 50,000 substantial men and women who have received financial, personal or business benefits from this training. Hundreds of successful attorneys are among our graduates. The Outstanding Course The Institute delivers prepaid to every student immediately upon enrollment the nationally known 25-volume Modern American Law library, cited as “*M. A. L.” by the courts of last resort. (See illustra- tion in miniature above.) This set of text and case books forms the basis of the Course and in addition serves as a yaluable reference work upon the entire field of modern day law. Many students have said that this library alone is worth the modest tuition fee asked for the entire Course. Elaborate Lesson POPULAR MECHANICS ADVERTISING SECTION sibilities of using the principles of law in daily business affairs. Graduates of the Course are awarded the LL. B. degree. The authors of the Course are out- standing authorities in the field of law. Included in the group are two Justices of the United States Supreme Court, the deans of eight university law schools, and sixty university law professors and attor- neys. ese men know law and how it should be taught. No Exaggerated Claims The Institute makes no claim that the study of its Course will bring a startling increase in income to every student. Yet many students have reported increases, some as high as 200% before completing the Course. Neither does the Institute claim that a law training will enable you to earn from $10,000.00 to $35,000.00 a year, yet a great many law-trained men earn in excess of that. The Institute does claim that a law training is the best foundation tor a successful business or professional career, and that its Course is without a peer in the field of non-resident law instruction today. Get the Facts Today Complete evidence of the merits and money- making possibilities of Black stone training is con- tained in an attractive booklet, “The Law-Trained Man,” which will be sent free upon re- quest. Ask for your copy today while the present edition is still available for free distribution. se the convenient coupon below or address a letter or post card to the Blackstone Institute, Department 99: Mich- igan Avenue, Chicago, Illinois. tor, —— aterial =——(ss—SsédS/): BLACKSTONE. INSTITUTE : an as om pogel lesson material is 4 Dept. 59, 307 N. Michigan Ave., Chicago 1 ale,” —_ i ae? intervals to ; Please send me by mail, and without obligation, a copy of ; LAW BULLETINS the student as he progresses y Your 128-page book, ““The Law-Trained Man,” and details H pany A Law Bulletin is distrib) through the Course. Theseles- 5 of your law course and service. H price ang peg ey | son units (illustrated in mini- 1 Name 1 CLIO} €. u, our ry y rremcdinnn =a De none ature atthe left) direct thestudy : fi ; =o cial business interest——an forts carefully and call atten- 5 Puen Position H . w exclusive Blackstonefeature, tion tothemoney-making pos § Business Address } y and ft sfied. ! it |

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POPULAR MECHANICS

The only man who could talk to the Superintendent “Soon after I began studying,” a student wrote to us the other day, “we had a change in management at our plant. I certainly was glad then that I spare time. For, thanks to my ha I had decided to study in my C. S. course, I was the only man in the organization who could talk to the Superintendent in his own language. As a result, I was promoted cose men who had been here from ten to twenty years. My salary has been increased 90% in the last ten months.” That’s a true story of what just one I. C. S. student has done. There are thousands of others. Every mail brings letters from men and women telling of promotions and increases in salary due directly to spare-time study. One hour a day, spent with the I. C. S. in the quiet of your own home, ~ Bae ys you for success in ‘the work you like best. Yes, i¢ will! Put it up to us to prove it. Melt & this ¢ Coupon for Free Booklet _—_—_—— -__ INTERNATIONAL CORRESPONDENCE SCHOOLS ox 56 Scranton, Penna. Without cost or obligation, please send me a copy of your book- ins and Why,”’ and let, “Who W full particulars about the course before which I have marked X in the list below: TECHNICAL AND INDUSTRIAL COURSES rehitect Architectural Draftsman uilding Foreman Concrete Builder Contractor and Builder Structural Draftsman Structural Engineer Electrical Engineer Electrical Contractor Electric Wiring Electric Lighting Reading Shop Blueprints Telegraph Engineer Telephone Work Mechanical Engineer Mechanical Draftsman Machine Shop Practice Toolmaker ha ar nell Civil a gine nd M , Surveying a appin Bridge Eng end Gas Engine Operating Business Management Industrial Management Personnel Management Traffic Management Accounting and C. P. A. Coaching ]Cost Accounting Bookkeeping peavey pevorsesesverseeseccees Automobile Mechanic Aviation Engines Plumber and Steam Fitter Plumbing Inspector [} Foreman Plumber Heating and Ventilation tj] Sheet-Metal Worker [] Steam Engineer [} Marine Engineer bj eefrigeration E Engineer by Highway Engineer [ } Chemist Shermer [)Coal Mining Engineer [_) Navigation 0) Assayer [} Iron and Steel Worker [ }Textile Overseer or Supt. [ }Cotton Manufacturing LW: oolen Manufacturing [)Agriculture (1 Fruit Growing [ ) Poultry Farming [)Mathematies [) Radio BUSINESS TRAINING COURSES Business Correspondence Show Card and Sign Lettering | |Stenography and Typing englis Civil Service Railway Mail Clerk [ }Mail Carrier | |Grade School Subjects [ } High School Subjects

Secretarial Work Spanish [© French [] Cartooning Salesmanship [ |Illustrating Advertising [jLumber Dealer Name. GB ove cececcccccecscccesscenmncoccerscocnccescoce cosscoseseoocossscosen vo essevecoveccosoecossoes Hi hsiitincinsiineninnedsentasseseuseunniscermastanestd State ° SITIIIIIE ocundiceéusingh donsantbgebinarecccoptuisboastbeetoerrseetosasonpessccyunasonseoneapeeneneseg If you reside in Canada, cond this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada ADVERTISING SECTION ELECTRICAL... ENGINEERING Intensive, fp oy courses. Engineeri: oJ Diploma in 1 year. Also Speci. Shore Coursse in Practical Electricity—Power Plant Operation— Armature Winding — Radio — Electric repens Electricit ty—Electric Weld- ing. low t TUITION TES. Faculty of recognized experts. Exten- sive aio bee tmploy ment weryice for erameaies. We help ing trai Be expert Morse or Continental code <7 EL—FUN— ADVEN- ep. TURE. After a few Tel lex! short weeks of Dractical study with Teleplex ‘ou will be an expert o7 his smasing instrument hes jon ight in your wa home. Works like a phono- graph. ww ledge needed— beginners learn at once a ‘ eo 10 days’ trial. Write for free booklet G-10. COMPANY, 72 CORTLANOT ST., NEW YORK CITY SONG WRITERS! UBSTANTIAL ADVANCE ROYALTIES oo paid on work found acceptable for —, tion. Anyone wishing to writeeither the words or music for songs may submit work for free ex- amination and advice. Past experience unnecessary. New demand created by “Talking Pictures” fully described in our free book. Write for it Today. NEWCOMER ASSOCIATES 759 Earle Building, New York, N. Y. LEARN WATCHMAKING and become independent. We help you oaue a position. asy tolearn. Send for FREE CAT 6G. ST. LOUIS WATCHMAKING SCHOOL Dept. 5. ST. Louts, MO. HORTHAND IN 30 DAYS Boyd, the wonderful easy system, 150 words a minute guaranteed. Send today for Catalog and sample lesson. CHICAGO HOME STUDY SCHOOLS 801 Reaper Block Chicago, I!'. Demand for~ The entire country is ots for skilled me- Skilled Mechanics! chanics! Good pay—steady work—good opportuni- ties for advancement! Master this fascinating trade with the aid of the AMERICAN MACHINISTS’ LIBRARY 6 volumes—2,000 pages—2,500 illustrations (A combined home-study course and reference library) This library of machine shop practice was written for practical men. It gives you the best methods for every kind of machine shop work. It explains machine tools and their operation, tool work, gears and grinding, jigs and fixtures, automatic screw machines, their tools, punches, dies, ete. Plainly written—com pletely illustrated—the best ind of help to the machine-shop man who wants to advance himself.

No money down— only 7c a day i FREE EXAMINATION COUPON, | McGRAW-HILL BOOK CO., Inc., 370 Seventh Ave., New York for 10 days’ free examination the AMERICAN MACHINISTS’ LIBRARY. ‘ff jatistactory, 1 will send $1.50 in 10 days and $2 monthly | i until the special price of $17.50 is paid. If not weated, I will return the books at your expense.

er Perel SRG SORE EIT | BERR c co cccvcccsccccedecocecocceccecscoccccedeececesocceseccese eocccee | Gp GB Bice ccnccccteccccesoccccscececescncocccceseseccocccece occcctes | Podiiien..cscccsee eveseces COO eee rererereseeseeeeseseseresesesssseseseee® l Lee a ss a cs es es ed esse PM 17-28 J

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|_|; “oe POPULAR MECHANICS ADVERTISING SECTION 43

At Last! Real College Instruction in Drafting At One Third the Cost:

= ~~ _ mo. inute sson, ne- ini- = eo < aa Sal Barer Cie

Righ Unquestionably, hundreds of the readers of this magazine have waited and hoped to run across just such a message as this. For an old-estab- lished and recognized engineering school now makes an important announcement about Drafting. At last, you can get real college training right at home, inexpensively, in this tig-pay profession. The trial lesson and other material offered below bear convincing proof and may now be f obtained without cost simply by i’ mailing the coupon.

OOK here, men. It is true that this message is addressed to men who would like to have the very highest type of college training in drafting. But let’s understand one another right at the start. Just because some of the most suc- cessful business and professional men in America are Chicago Tech graduates is no sign that anybody is going to try to get ‘‘high-brow."’ And because students come to Chicago from all over the world— often spending many hundreds of dollars —doesn't mean that you have to pay a lot of money for this practical, simplified, easily mastered training. Far from it! For now as part of the Chicago Tech new plan you may obtain complete home training in Drafting at a mere fraction of the usual cost of a college course. Experience Is the Best Teacher Nearly everyone has heard of Chicago Technical College. Over 1,000 men each year attend this well-known school. Here they quickly learn engineering and architecture, including Drafting. Not out of dry, hard-to-master text_books. Not by a lot of tedious “study.” But by the wonderful “practice” system developed by Chicago Tech. By this method every- thing is far easier to learn because it is more interesting. In fact man after man will tell you that learning any subject the Chicago Tech way is more like playing a fdécinating new game than anything else. It is almost as different from the drudgery that you will find in ordinary “schooling” as night is from day. And now this easily mastered, pay-raising training is yours quickly, right at home, in spare time, at nominal cost. Earn Up to $100 in a Week This is the type of training that really leads to the big-pay positions in Drafting, where many earn from $5,000 to $7,500 ® year and up. The largest employers of skilled draftsmen recognize the value of College-Training-in-Drafting, and con-

stantly apply to Chicago Tech for Drafts- men. Hundreds of Chicago Tech graduates who are now in top-notch positions of authority or in business for themselves do the same. The Chicago Tech employment depart- ment makes no charge either to students or em- ployer if you accept one of these jobs. The entire success of this College-Training-in Drafting has been proved so thoroughly that the “‘at-home” training is covered by a binding money-back agreement With the Chicago Tech course you are supplied a full set of high- grade drawing instruments in pocket case special drawing table for home use. And a valuable drawing outfit. These are the same as used in the College. You get them without any extra coset whatever. Learn the Facts—Now! Where else on earth can you get reai college training in Drafting like this? Yet now it is offered to you as part of the new Chicago Tech, Home-Study plan on amazingly liberal terms. *. So if you want to learn Drafting the successful, approved and easy way—get the Free Trial Lesson and other valuable information. Simply mail the coupon without obligation. 4 GetFree | Proof | sx a/ yy o<)

CHICAGO TECHNICAL COLLEGE Dept. R-202, Home Study Division, Chicago Tech. Building, 118 E. 26th St., Chicago, Il. **College-Training-At-Home"

COLLEGE-TRAINING-AT-HOME COUPON Chicago Technical College, Dept. R-202, Home Study Division 118 E. 26th Street, Chicago, Ill. Please send me the facts about your new system that enables mea to master professional Drafting at home jurt as you teach it at the college in Chicago Include your FREE TRIAL LESSON. This does not obligate me in any way. Name... o- see ; 0 0b6snbedseeceseneen Address nee eedeseoveoces bbvenbegsdecescoseseqouane State Town ooceenwe ( ) Cheek here only in case you prefer coming to Chicago to take our short course in Drafting at Chicago Tech

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44 POPULAR MECHANICS ADVERTISING SECTION

Money Back Guarantee -_ If, after completin and Earn $75 to $125a Week as Auto or Aviation Expert | =, taining; ¥u are Learn the auto and tractor business by the McSweeny method, then step are not qualified to out and get a good job at t $75 | to | $125 a week or open oe own a repair she shop accept 4 evar Job. and make up to $10,000 a fA ee veryw portunit your tuition w be George Smith owns an agency weeks’ wainins fits you shop ot toes on with one of the ae firms welding for sind refunded. and ng 4 ue in West Alex- men. Read w t George sSenk and C. E ecole have done. mem ho << heer orale wratned ~' ti ts. Every mon eSweeny ae hio. He makes $200 =~ yw a = in pyr Pb = AV IATIO ON Course simp min Only 8 Weeks is. You learn the “why” of AVIATION is paying tremendous incomes to trained Methods men! Coupon brings complete details about complete everything you do, then learn to do course in Aviation. Learn on real airplane engines it right. You do real work = ‘ wader CS ag oy Sapernesere. — as soe! real tools and real mys ant — course in ° on't miss this remarkable opportunity. book studying. Very little schooling aun ae Eietutanes te youl. ‘ _ wil be — necessary. omy | man pow yh can learn. Wri oday MAIL COUPON FOR FREE BOOK ;,. 3) Special Limited 4 Time Tuition Offer. No McSweeny Auto, Tractor and Aviation School, s =— ae, colored stu- § Dept. A-11-M, Chester at 30th St., Cleveland,O., = de rite for Bley ® or 263 Madison St., Memphis, Tena. ean iivustrated. Book FRE Without cost or obligation, send me your big FREE book on Autos and Aviation, also full details of your special tuition offer.

charge of s fleet of trucks and tractors for the Commission, due training.

State Highway to McSweeny

- AT 263 Madison St. oe Memphis, Tenn. T E I E G R A Pp H Y Learn Watchwork, Jewelry work m™ Wireless RAILWAY ACCOUNTING, taught th bl i and Engraving A fine trade commanding orse remendonm end Ralbway 4 taraeet ec ee Peet. Be a good salary, and your services L. always in demand. Address Horological, Dept. P, Bradle Pon eagy cg a — aa beg ay - ek ted, | Institute. PEORIA, IL LINOTS: for our latest catalog. ‘ WHICH COURSE f HAVE YOU THE COURAGE TO ere, ee Raise YOUR OWN SALARY? Drafting — Architectural, Ma- chine—Heating & b-neg gp” siaite ten stale’ ieaitik 6 fa pie ° ° a ° ts) ia! ou can learn any j q Engineering: Plumbing & of the courses we teach. Pick out Tell me ahich . . — Sanitary Engineering—Sheet ¥ the one you want to learn and d I'll send bi ee Metal Designing & Drafting write me today. eS Sa eee 0 ee Oe aes Deciatedl Gadaien to the ear outlining everything. Then you —Boiler Maker Layin F . an foe Ales g to bigger pay envelopes, to will know how much I can help Ou ‘ pe being your own boss. You You. Finding out costs you Steel Ship Laying Off can do it! nothing, puts you under no & Plan Reading — Contracting Let me show you how quickly and Obligation. Check your course & Estimating—Mathematics & thoroughly my home instruction methods and write today. Slide Rule Reading — Address O. W. KOTHE, Dir. Aeronautical Draft- ST. LOUIS TECHNICAL INSTITUTE ing & Engineering. CHECK AND MAIL TODAY} 4545 Clayton Avenue ST. LOUIS, MO. Travel On 1900 Year to Commence _ “Uncle Sam’s” } SEE YOUR COUNTRY Pay Roll Mail Coupon Before You Lose It

& * FRANKLIN INSTITUTE, Dept., D193, Rochester, N. Y. Sirs: Rush to me without charge—copy of 32-page book, “How to Get U. 8. Government Jobs,” with list as Positions now obtainable and full ven telling how to get them. eee, STEADY WORK —NO LAYOFFS—PAID VACATIONS ; Neme RAILWAY POSTAL CLERKS — MAIL CARRIERS — CLERKS i Ran Sa bdar eh neds Hones nenseravedensttstvacbeusceneeuses g Common Education Sufficient

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ns POPULAR MECHANICS ADVERTISING SECTION 45 Follow this Man! Secret Service Operator 38 Is on the Job Follow him through all the excitement of his chase of the counterfeit gang. See how a crafty operator works. Telltale finger prints on the lamp stand in the murdered girl’s room! The detective’s cigarette case is handled by the unsuspecting gangster, and a great mystery is solved. Better than fiction. It’s true, every word of it. No obligation. Just send the coupon. FREE 2 Sontisentiot Reports No. 38 Made to His Chief And the best part of it all is this. It may open your eyes to the great future for YOU as a highly paid Finger Print Expert. More men are needed right now. This school has taken men just like you and trained them for high official positions. This is the kind of work you would like. Days full of excitement. Big salaries. Rewards. Earn $2500 to $10000 a Year - — You ; ; INSTITUTE APPLIED SCIEN Ce ey Oe nome Un Spare FMC | e20 Sumpside Ave,Dept.18S9 Chcago, tna read and write, and think can make good. A won- your ay Hy iustreted Bees a on Finger Prints, derful book tells all about what others have done. also FREE copy of operator No. 38’s confidential report. Shows pictures of real crimes and the men who solved them. We’ll send you a FREE copy with the Tell me about your low prices and easy terms. free reports. Get our low prices and easy terms. Mail the coupon. FB. 2.00000cenesesneesenesenseccesnsseeecercnsssescnsn INSTITUTE OF APPLIED SCIENCE DDBIEED ccccocnccccevesccscccsccccscccocsocosececcoesennell ° 1920 Sunnyside Ave., Dept. 13-59 Chicago, Illinois

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ii piu! hy fl 7 é; & at Home ~ By MAIL 3000 illust Course in Read This Great Endorsement Dr. A.M Wilson, Editor of the S: of The Society of American Magicians, pays the Course this tribute: “The renters mine = Magic ever attempted and will mark an e lations of Robert He Houdini, * Father’ of of Modern Magic, 60 years ago.’ Big Stage Illusions Secrets of the Orient Master Illusions from Eu- rope, India, China, Japan. Guarded secrets of the Orient—over 250 tricks from small effects to Big Stage Illusions, with nearly is what you get in the Tarbeil ‘> s rations, that and more Magic! phinx, Official Or = greater than the reve- Money-Back Guarantee Protects YOU The Tarbell course in Magi ate you with an Iron Clad uarantee to refund your mon- ey if you are not satisfied. You can’t lose. You have every- thing to gain. Get Started on the Road to Big Money You need not it give up your job. You The first and only ourse in Magic ever offered to the public teaching real ~~ eed agic! can make nice money entertainin on- aay asa cemiprof fessional Coe it ig Magician, make big money, enjoy fame and glory. Tarbell Sy stem, 1926 Sunnyside Avenue, beedio you want to, you can Inc. 13-59, Chicago, Ill. Mail This Coupon NOW! Tarbell System, Inc. 1926 Sunnyside Ave., Studio 13- Tell me about Dr, Tarbell’s new and simple system by which I can learn the secrets of MAGIC. Also tell me about your Low Price and Easy T. gation on my part. Name. 59, Chicago erms Offer. No obli- Address. POPULAR MECHANICS ADVERTISING SECTION Dont Miss Half the Fun In Life ! BE POPULAR — markable new easy method which enables anyone to learn all the newest dances at home—in a few hours — without music, partner, teacher! Success post- tively guaranteed! 400,000 learned dan Sone das easy way. $5.50 Case Now Only $1.98 ere prove how quickly and easily | n become an accomplished, ver- vatile danest I will send you my regu- lar $5.00 dancing course hout one penny in advance. Just send your name and address and when the package arrives give the postman only $1.98 (plus few cents postage) and this famous course is yours Try it for 5 days—money back if not delighted. Don't delay — act NOW and be a good dancer SOON, Arthur Murray, Studio 965, pew YORK NY: eek ll receive y eae 16350 iB eu i——— 4 ~Y juction o: e- Sameas advantage now |" of this ‘amazing ‘er -- photo ANY i UNITED PORT RaiY COMPAN 1652 Ogden Ave. Devt. W-369 Chicago. tt. Wonderful, new device, guides your hand; corrects your writing ins fewdays. Bi {provement in three hours. No failures. Complete outline FR Write C. J. Ozment. De St. Louis, Mo. ZIP-ZIP SHOOTER "THOUSANDS of boys are made happy 4 with this wonderful Zip-Zip shooter, w scientifically and practically made. If you like hunting and outdoor sports, get a Zip-Zipshooter with plenty of pep and force. If your dealer happens not to have them, order from us. Zip-Zip shooter 35e or three for $1.00; send stamps, coin or money order. Automatic Rubber Co., Columbia, $, C, =P Rkares=s i] New peasets 5 ad ready for delivery ¥ i direct from = P factory. Ai tonishi ing tow prices d terms ot bu: tit you HIDEH AGENTS WANTED to thie ane pezhibit sample. Make big money. Many models $21. Guaranteed $1.50 each, eX ires lamps, horns, Wo Mowes."y at haf usual prices, Send on RAN ait ot kas Si 7 Rae A \ 1 Oc° NEW SCIENTIFIC WONDE 3 for 25¢ RAY ae SILVER ONLY BO Ys You \npeere "Wood, Write for thru Clothes, out camera. “You'lllike em.” 1 pkg. with each 2Sc order. MARVEL MFG. CO. Dept.31 NEW HAVEN, CONN. an tin co ee on oe eee 6lUe CUE

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Here’s a genuine ERECTOR motor. Comes equipped with driving pulley, runs all mechanical toys like Erector, Meccano, ete. Binding posts connect with dry battery or transformer. This is a strongly built little wonder motor, one of the finest we have ever seen. The name Erector is your guarantee of quality. This is just the motor you have been waiting for. With it you can do all kinds of elec- trical experiments and learn many of the principles of electricity. We are very fortunate to be able to make this wonderful subscription offer this year and we urge every reader of Popular Mechanics to take advantage of this. POPULAR MECHANICS ADVERTISING SECTION Genuine ERECTOR Motor

32 PAGE EXPERI- MENTS BOOK With this very special offer we are giving with every motor a 32 page book of inter- esting electrical stunts and experiments. This book tells all about motors. Tells you how to take them apart and put them together and teaches you the principles of electricity. Tells how to make a galvanoscope, how to make a magnet from iron nail, how the armature is made, and water rheostat. Scores of electrical tricks. Mystifying. The book is full of illustrations and very valuable. Free

with this offer.

We guarantee your satisfaction 100%. Get your motor at once. The Magazine Packed With Thrills The Open Road for Boys Magazine has 50 pages every month crammed with thrilling, breath- taking stories that will hold any boy spell-bound. Tense stories of high adventure on land, on sea and in the air. He-man stories, the kind you have looked for everywhere. Deep mystery, suspense, sport, action, thrills. Big “Boy Mechanic Department”? every month. Articles on model BO} Hf 4S 25 ments with contests galore and prizes for all. The Open Road for Boys Magazine is one 7 OGE] HER magazine you can’t do without. You will be planes, aviation, sports, etc. Wonderful depart- wild about it! <TheStreetotDreadtulStence” muy i 2 ie Now starting is a new serial ‘‘The

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: ‘ Open Road for Boys Magazine, Canadian Postage 25c extra smash in ten years, a story with a Department 656, Foreign Postage 50c extra punch in every sentence, a tale that q 130 Newbury Street,

will stand your hair on end. Don't you Boston, Mass. are miss xt! ff ot ti , ag- a a cpl so ee You bet I'll grab that bargain. Enclosed is $1.25. Rush me the elec- subscription price to the tric motor and the 32 page Experiments Book and put me down for a Open Road for Boys is year’s subscription to The Open Road for Boys Magazine. I want to : ‘ read ‘* The Street of Dreadful Silence Slayear. Special Offer. For only $1.25 we will send you this wonderful Erector electric motor, a 32 page book of experi-

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48 POPULAR MECHANICS

diskaiatinaiees way Make up your mind today what you want to be, then take the first step at once. You don’t have to go to college to get ahead. Other men have gone there for you and have put the things they learned there and through years of practical Cy yy into easily unders' hood books which give you a short cut to a better and a job. We have picked 13 of the best paying professions and have published for your benefit new editions of the most practical, the most valuable books we have ever printed on the subjects covered. JIFFY INDEX Our new Jiffy Index makes each book a quick reference work— need be wasted no time in search or study—put your finger on the facts you want instantly. Special Price List of Pay-Raising Books Automobile Engineering, 5 volumes, over 2,000 pages....... $24.80 Civil mepocrms. 9 volumes, 3,900 pages 3, aoe. . . 34.80 Practical Business Administration, 12 volumes, 3,400 pag (Extra volume — self quiz reading course of $0 cluded free 39.80 34.80 Modern ‘Shop Practice, 7 volumes, 7,250 pages, 3,000 pictures. 29.80 American we and Practice (with reading course), 13 volumes, 6. es, ill sees ML «.diwhudieda 0506s 6 eo nue 49.80 Telephony’ po elegraphy, 4 14.80 14.80 ” 14.80 24.80 Employment Management and Safety Engineering, 7 volumes, 1,800 p: pages, 540 illustrations, charts and diagrams. Architecture, yan we ry and Building, 5 volumes, includes 58 beautiful architectural plates free: pelevecscese ececceve ° SHIPPED FREE weeds alone cannot describe the full value these books may be you, so we ship Free for Examination. Pick the set you want, the price is plainly shown, but Send Ne Money; just your name dress, and the books will be sent promptly. Take fifteen full days to read, test and examine them. You'll realize at once what a tremendous force for a better future they can be. After fifteen ove ye, you ae ond ere. Are $2. fo: then $3.00 per month until e balance is No Interest Charges of Any Kind; the ries on showb ist the total cost. Anyone who takes advantage now of this opportunity to ‘‘Raise his Pay"’ will be given absolutely free, a certificate of membership in the. American Technical Society, which entitles him 3 ~- — tion privileges with our experts in his chosen field. is good for a whole year and is of tremendous value in imeciving epecied problems. American Technical Society, Dept. Xxo19, Drexel Ave. at 58th St., Chicago, U. S. A. Please send me set of for Fitteen Days’ examination. “"T will examine the books chorouenly and if satisfied, will send $2.00 within 15 days and each month until I have paid the special price of $ If I decide not to keep the Deets I will return them at your expense at end of 15 days. Name. .

ADVERTISING SECTION STATEMENT OF THE fy ala ge te Mensgaans, Se ge BTS REQUIRED BY THE acT OF © NGRESS OF AUGUST 24, 1912, waaay at iiss: Il., for October, a he

State of Illinois, County Before me, 8 notary Dublie in wal for the state and county aforesaid. personally ap. — H. eae Jr., who, having been duly sw business m manager of the. Por ular Mochssice i Magazine wledes and Temmediatcle Soon rs, mol and other security 1 per ceat or more of total amount of bonds, mortgages, or H hat the two paras vhs next above, gi ng the names of the owners, stockholders, and security holders, if any, qputein poe — the list of stockholders and securit re = of the the Bock of cha but also, in cases where the Pap coy 3 or security holder ul uc! rel ° ps of t ion for whom suc ven; also that boy said two paragra; phe comsak potas sy ahh gemtoneins | affant’s ofall Ener e and belief nd security holders books of the company as truptecs, bold stoc! in 8 capacity other than that of bona fide owner; and this affiant has no mpete to hat any other rson. association, or corporation has any interne’ direct of indirect in the eaid stock. bonds. or other securities than as so stated by bh: oh H. R. Jr., Editor and Publisher. Sworn to and subscribed before me thi 28th (My commission expires AW HIGH-GRADE INSTRUCTION BY CORRESPONDENCE day | of om 1929. J. GRAHAM, Notary Public.

Post Grad. and Bar Ex. Rev. Law has attracted more pay i! = than any yale aoe calling. Send oaey for catalog. cost, Standard te Ba Chicago School of Law Rea Block Devt, Bon, Reena: ®

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Amazing Opportunities in ELECTRIC REFRIGERATION wr look for big pay in crowded industries? Get into the newest and fastest growing industry in America—Electric Refrigeration. Millions of dollars being invested by Wall Street in factories and advertising. Urgent need for scientifi- cally trained men in penis, | —, sales and service. Jobs pay $200 to $1,000 a month. @ new easy method trains you at —: “to fill a big pay job. Learning Eiectric Re- trigerationsimeeses amazingly. This course sponso: by Kelvinator, Copeland, and pra‘ nised by General Electric. Servel, Zerozone and other —_4 at iets, = ployment Dept. helps you ig jo conpen py BIG BOOK FREE of this business. = will be a pleas- Mail coupon now for big book free “Rich co-oper- Rewards in Electric Refrigeration.” See =e per.

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> UB, ario St. n I ito the ectric - Wall ientifi- er vice. itute reat | é Se POPULAR MECHANICS ADVERTISING SECTION : Movies feach You ); ELECTRICITY Paves the Way To BIGGER PAY OW there’s an easier way to learn ELECTRICITY. Right in your own home you can quickly prepare yourself for a BIG PAY JOB. This new way takes away the ek ery. MOVING PICTURES train you, that’s the secret. Every principle de monstrated before your eyes. You see the currents flow. You see generators, dynamos, switchboards and all standard electrical apparatus in action. Fascinating as a news reel. Movie machine furnished at no extra cost. Hook it up to any electric connection. See the movies on your own screen. Repeat them as often as ™ you wish. Thousands of feet of film furnished. The best colleges use =") MOTION PICTURE training. Now you can get it at home. Gives - you advantage of home study training plus residence school experi- ence. All at much lower cost. eh Endorsed by Engineers and Educators With the help of such practical engineers and educators as Bruce A. Rogers, M.S., Western Electric Co., J. A. Shimek, M. E., E. E., Engineer DeVry Corporation; . P. Hollis, formerly Director Visual Education University of North Dakota; F. S. Wythe, Director Neighborhood Motion Picture School Film Service, and W.N. Littlewood, formerly instructor University of Wisconsin, who will bave personal charge of your, training, pe will soon be ready for big pay jobs in Aviation Electricity, Radio, Switchboard Work, Sub-Station and Power Plant Operation, Automotive Electricity, Wiring, Contracting, Merchandising, Etc. , This Money-Back Pledge Protects You ~ » You take no chances when you learn electricity this modern way.We are so sure of your success that we sledeed in writing to give you training and employment Service necessary to get you a better job at bigger pay or refund every cent. This pledge protects you. Itis your assurance that our MOTION PICTURE So training will increase your pay check. $60.00 to $150.00 a week is common in ELECTRICITY, Many make much more. Thousands of men are needed. j Work is easy and steady. Here’s your chance to say good-bye to long hours ENGINEER SAYS NEW WAY and.low pay. Prove it to your own satisfaction TODAY. P > _, Write Now for §°.).30°2 "4" harles L. Fitz, +» @ prace B FREE k Way to Bigger Pay,” ig Boo anliies the marvelous ticing engineer, formerly associated with Steinmetz of General Electric, says: ‘‘I am amazed at how clearly opportunities now open in Electricity. The coupon will bring it FREE. There's no obligation. Write NOW while special introductory offer Tasts. paeS, and simply you explain the facts about electricity and electrical work, You show the principles oe ¢ motion pictures and animate ia- [7 2 grams better than we can even in * WD GS i Seems to me by far the best method WA The NATIONAL SCHOOL of VISUAL EDUCATION 537 S. Dearborn St., Chicago, U.S. A. Dept. 12-H A Send of getting thorough peoperestes for practical electrical wo: book, “‘The Film Way to Bigger Pay,”’ with facts about this new, easier way to master electricity. ical dtteidiihincssnaditictcathitecsenucceetbcoouete a St. or R. F. D.

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in past few years). with these six outfits of Broadcasting and commercial Radio in and year out. t because y Tt watertal. POPULAR MECHANICS ADVERTISING SECTION ot Be a Trained Radio Rect If you’re earning a penny less than $50 a week, get my free book of information about the Radio business. Trained Radio E xperts are needed in more than twenty different lines of this new and growing profession (three hundred thousand new openings created by the swift growth of Radio Why go along at $25 or $35 or $45 a week all your life? Study Radio and after only a short time land yourself a REAL job with a REAL future! Be a man who has money in his pocket and in the bank— don’t scrimp and scrape for the rest of your days. Salaries of $50 Up to $250 a Week Not Unusual in Radio The good positions in Radio pay all the way from $50 on up to $150, $200, and even $250 a week. Suppose you don’t climb to the very top but that you do advance to a position that pays yes $125 a week, year Any chance to make that muc Then send for my free book, and learn about a field where there’s some real opportunity. Money Back If You Aren't Where good men, if Fully Satisfied > I'll give you all the training you need to get into an : 8 s or. line of the Radio business. And I back their way into a ally up this training by a signed agreement big salaried jobs! to refund every penny you pay me if upon completion of my course you are not satisfied with the lessons and instruc- Get Book! tion service I give you. . hats Six Big Practical Outfits Given You Te the record Radio jobe sre wale Help You Learn — ie I teach you bs the * ra” and the “how” of Radio. You book—now he's Chief Engineer learn to DO a and you learn WHY it's done. I send you at WEMC and designs and builds WITHOUT EXTRA COST with your course, six big practical poy ey RR Outfits of material to experiment and work with. These outfits in his own Radio business and are the real thing—not toys. The they contain will build sapere peciite an high se $70 ie approximately one hundred different Radio circuits, “With all at as be es this material you do practical work from start to finish of your ligation — just mail coupon on training. You get your hand in, and you get confidence in your- opposite page. self. Then when you run mee a Radio ——s. later on the job, you KNOW you can do sta: work lot of learn to be 4 “ paper Radio Expert ’’—you learn to be the kind of —it'’s a biz, goowing id and dapeinetinn expert that shows his worth on the payroll, Full details in my Te ME rte | ble book—eent tree * Send Fer Free Beok of Information u've already done it With me you don’t where you are now? they have the right training, can work Find out for yourself about the biager ¥y waiting for you in oa rom $2,000,000 in 1920 ‘pa. work you must acturing has grown faster in the inet of six years than any other bi business ever did. It’s two hundred i fifty times as big as it was. That m J — of good chances for the trained Radio ——_ xpert. ing iz men everywhere. For this be trained. ot operators on peas’ go world on ya over ee ited aw ater ry b besides. "Ti It's Far hip everything. Yoo’ oi Ra you city wa) this stra You spa ing ces:

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ook of needed fession Radio ur life? with a ank— 2ek » $150, ry top c, year > now? 3 some nity. en, if right work really ! Learn Quickly,Easily Train at Home In Spare Minutes Stay home! Hold your job! I'll bring your Radio training to you, and you can learn in your spare time after work. No need to go to a strange city and live for months on expense when you learn my way. You study in the quiet of your own home. As for this training—it’s written just as I would talk—in straightforward, every day, understandable language. You'll get it, and you'll get it quickly—in a few months’ spare time—because I’ve made it so clear and interest- ing! No particular education needed—lots of my suc- cessful students didn’t finish the grades. Many Earn $10, $20, $25 Weekly Right Away ‘On the Side”’ Deloss Brown, South St., Foxboro, Mass., made $1,000 from spare- time Radio jobs before he even finished my course. H. W. Coblentz, Washington, averaged $45 a week; Leo Auchampaugh, 6432 Lake- wood Ave., Chicago, made $500 before graduation; Frank Toomey, Jr., Piermont, N. Y., made $833 while taking the course. All this done IN SPARE TIME away from the regular job, while these fellows were still studying the course—and they're only a few of hundreds. As soon as you start this training I begin teaching you practical Radio work, Then a few weeks later, I show you how to make use of it in spare time, so you can be making $10, $20, $25 a week “on the side,”’ all the while you're learning. 64-Page Book Sent Free for the Asking My big book of Radio information won't cost you a peony, and ycu wou't be under any obligation by askiag for it. It’s put hundreds of fel- lows on the way to big pay aad brighter futures. Sending for it has been the turning-point where many a man has made his start toward real Suc- cess. Get it. See what it’s going to mean to you. Send coupon TODAY! Address: J. E. SMITH, President National Radio Institute Washington, D. C. J. E. Smith, President, National Radio Institute, Dept. 9ZP, Washington, D. C. Dear Mr. Smith: vantage of them. call on me, POPULAR MECHANICS ADVERTISING SECTION Kindly send me your big free book, “Rich Rewards in Radio,” giving all information about the big-money opportunities io and how you will train me to take ad- I understand this places me under no obligation, and that no salesmen will Leeeeceawew wee eaeeoeee = = - Hundreds of fine jobs opening in Radio every year Radio needs more trained men to take care of its rapid growth. Every year there are many fine jobs for men with the right training in roadcasting stations, commercial land stations, Radio factories, with Radio dealers and jobbers, with shipping companies which offer world- wide travel and good pay. Besides there are countless opportunities to have a spare time or full time business of your own. Talking movies, Television and many other new and recent developments in and uses for Radio are increasing the need for trained men continually. This is best proved by the fact that the Employment Department of the National] Radio Institute is getting three times as many calls for our graduates this year as it did last. Radio’s $5000 and$10,000year men of the future will be picked from those who get in now Just as the men who got into the auto- mobile business, the motion picture indus- try and others at the right time now have the key jobs, so those who get into Radio now, while it is growing fast, will have the first chance at the big jobs. The opportunities that make men rich in other fields are developing right before your eyes in Radio. I will give you the train- ing you need to break in and have a firm foundation on which to build for a sue cessful future. Find out about my methods that have increased the earnings of so many others. Mail the coupp today This big 64-page book, printed in two colors, crammed with interesting facts and photos about ' money-making opportunities in Radio, sent fre } to everyone who clips the coupon. No obliga- { tion by sending for the book— it’s absolutely free. One of the most valuable books about Radio ever written.

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52 POPULAR MECHANICS ADVERTISING SECTION

Salary Increased from $112 to $400 a Month “My I. C. S. course in Cost Accounting was of great practical help in enabling me to install a cost system in a plant having somewhat unusual problems. It also helped me to get my B.C.S. degree from a resident commercial school and in pre- —_ for the C.P.A. examination. My salary was $112 a month when I enrolled. It is now $400 a month, with a generous allowance for traveling expenses.” That’s a true story of what spare-time study has done for just one man, There are thousands of others. hacks don’t you take up a home-study course with the International Correspondence Schools and p' yourself to earn more money? You can do it if you try. Tt doesn’t cost you a penny or obligate you in any way to mark and mail the coupon, but that one simple step will brin you information that will help you to get out of the rut an make good in a big way. Write Today for Free Booklet INTERNATIONAL CORRESPONDENCE SCHOOLS Box 5655-F, Scranton, Penna. Without cost or obligation, please send me a copy of your book- let, “Who Wins and Why,’’ and full particulars about the course before which I have marked X in the list below: TECHNICAL AND INDUSTRIAL COURSES Automobile Mechanic Aviation Engines Plumber and Steam Fitter Plumbing Inspector Foreman Plumber Heating and Ventilation Sheet- Metal Worker

Draftsman R. R. Positions Highway Engineer Chemistry Pharmacy Coal Mining Engineer Navigation [) Assayer Iron and Steel Worker ‘Textile Overseer or Supt. Cotton Manufacturing Woolen Manufacturing Mapping Agriculture (1 Fruit Growing Poultry Farming Operating ematics BUSINESS TRAINING COURSES

Business Management Business Correspondence Industrial Management Show Card and Sign Lettering Personnel Management Stenography and Typing Reounting sad Civil Servi v ce Cc. P. A. Coaching Railway Mail Clerk H Seokeep Grade School Subjects I rade iu 2 IT Work High School Subjects panish French Cartooning [} Sal D Tilustrating iJ |Lumber Dealer Name Address City. State. ILS, ©. 153-> sca dahabesecelssbes casmniovech ebleniidsée concbuncepacecsqnoovsensénsnnsipat If you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada

Wouldn’t You Like to Get into Amateur Radio? Imagine the thrill of building and operating your own private short-wave transmitter and receiver, and talk- ing with other amateurs ali over the world! alk with the Byrd Expedition at the South Pole! Chat with other expeditions in the far corners of the earth! Gossip with Frenchmen, South Africans, Chinese, Australians, or fellow-Americans thousands of miles away. Or, if you wish, listen in on concerts direct from London, Holland and Australia! You can <—? for less than the price of your broadcast receiver Here Is a Book That Tells You How! THE RADIO AMATEUR’S HANDBOOK It explains everthing about amateur radio and short- wave work from A to Z. Tells you how to build short- wave receivers from the simplest to the most compli- cated, that will bring you signals from all over the world; how to learn the code; how to get your licenses; how to build simple transmitters; how to build better transmitters; how to adjust and operate your set. 232 pages 6%x9% 188 illustrations Over 60,000 copies in use Sent postpaid anywhere in the world for *] American Radio Relay League Hartford, Connecticut, U. S. A.

Learn mting, first easy lesson. sent free, INTERNATIONAL ACCOUNTANTS SOCIETY, Inc. A Division of t Alexander Hamilton tute Dept. 102, 3411 South Michigan Ave., Chicago, Ill, We quickly teach you by mail, cr &t school, in spare time. Enor- future. Inter- mand. Big work. Oldest and foremost school, $50

Otto + ee 000 from his business in one . A gets $25 for a show card. Crawford, B. C.. writes: $200 while taking course.” Write for complete $2.98 brings you the famous boxing course by mail of Jimmy DeForest, World's Greatest Trainer and Maker of Com course sent you one mailing. Send $2.98 or C. D. order paying portman $2.98 plus actual JIMMY DEFOREST BOXING COURSE 347 Madison Ave., Box 137-8, NEW YORK CITY

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POPULAR MECHANICS ADVERTISING SECTION 53 cael wn ik- le! he 18, ds rts an er BRAND NEW CORONA ‘oils Lowest Price — Easiest Terms Ever Offered ERE’s your chance to own that brand new Genu- ine Model 3 Corona you’ve wanted—on the easiest terms ever offered —at LOWEST PRICE ever offered. Complete in every detail; back spacer, etc., Manufacturer’s Guaran- tee. Recognized the world over as the finest, strongest, sturdiest portable built. bus for 10 DAYS FREE Only a limited number of these splendid machines avail- able. To get one, you must act now! Experience the joy this personal writing portable typewriter can give you! Use it ten days free! See how easy it is to run and the splendidly typed letters it turns out. Ideal for 2 the office desk, home, traveling. Small, compact, light, convenient. Don’t send out letters, manuscripts, reports, bills in poor handwriting when you can havethis P"“"""~=*-* Seen wew ewan | Cc t such a low price on such ea ‘ -_ “ on Le s) | Save Money—Use this Coupon: terms. Remember these are brand new machines right out of the Corona factory. * g..iet Typewriter Sales Corp., (Corona Division) 1 il. Dept.c3 eee - 469 E. Ohio St., Chicago, ' Carrying Case FREE & siicse tse coro, F.0.8, Chicago. Gperring 1 dnoat 2 wit If You Act Now! t Sis" $57 SE Salnpen of 498.00 pris a bald: Soe thie fo romate, with © & a ss a you until then. I am to have 1! ys to try the typewriter. If I d £ Leatheroid carrying case, oiler. instructions 4 furs my i. Yousre weirs our amnaardguareate. coupon. Without delay or red tape we willsend youtheCorona, » ' Try it 10 days. If you decide to keep it, send us only $2—then $3 Name ___ ' a month until our special price of $39.90 is paid. Now is the » ate ' time to buy. Special Xmas Package if you act now! e aaa ual = ' ) s —_ a Employed by ‘ ee lee | sean eeweeacaunneaasaanaazseacd

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54 An EXTRA Room | Home With a Laco in | basement, it is no longer a dirty, grimy anything but the coal pile. You add a clean, airy room to your home—suit- b able as a recreation room for the child- ren, a workshop or den for you, a clean place to hang the laundry in winter, etc. Simply Set The Thermostat — Then Forget Heating Troubles The Laco thermostat provides just the amount of heat you want, WHEN you wantit. Operates quietly. Does not inter- fere with the Radio. Simple. Nothing to adjust. Designed to last a lifetime. Guar- anteed. Complies with all ordinances. Actually safer than the ordinary kitchen gas range. Now —resolve to end drudgery, carrying dirty, heavy coal, ashes, smoke, chopping, shoveling. Install a LACO and for- get your furnace, POPULAR MECHANICS ADVERTISING SECTION OIL HEAT NOW AT A FRACTIO of PRESENT COSTS Now —it simply does not pay to use coal when you can have oil heat at such astonishing low cost. Think of the convenience— no more getting up cold mornings, no more chopping, no more shovel- ing — THEN THINK OF THE ACTUAL MONEY SAVING which is the outstanding advantage of the exclusively patented LACO! Wonderful Invention Burns Oil New Way Fits Any Furnace Other power burners, by means of air pres- sure, convert the liquid oil into a spray and burn oil in spray form. The surplus air pres- sure thus required blows a large part of the spray upwards, out of the smokestack, wast- ing heat, increasing fuel expense. Contrast this with the LACO, which by means of the indestructible MINERAL WICK, converts the oil into hydro-carbon GAS, the most perfect medium for creating heat known to man—because ALL of it burns and WASTE IS ELIMINATED! A given amount of oil, burned in the LACO, lasts longer and saves you money! OIL HEAT FOR COAL RANGES The New ‘LACO Cook Stove Burner ek can have convenience and on t for your cook stove, equal to city gas, but at a FRACTION of the cost! The new Laco Cook Stove with the dru . No longer n | the housewife be a slave to the coal bucket and the woodpile. The Laco Cook Stove Burner any coal stove or ra Has burners. Gives you CL AN HEAT, as FAST as city gas, but safer, as you can go away and leave it on al night, or you can — it enightes and nothing will Sold terms ata SENSATION ALLY LOW PRICE. Write for informa- tion. State whether you have elec- pid, Also ask about the New Laco for heating stoves. ts easily = Installed Quickly Without Loss of Fuel Costs Smashed Smoke, Soot preferabl man w and Grease Semete amount in cormeneteatem _— chen Eliminated The spray form method of burning oil means waste oil, and that means smoke, soot, DEALERS WANTED We want rated men, vapor heat, etc. Most ce —but also tomers install it themselves- will invest any mechanie can do it y,| time, following our A- jons. ano ortunity. NOWG GH FOR R ANY Heating Tin The Laco fits right into you furnace—any kind of furnac —hot air, hot water, steam ta Just pay down the small amount required, and the new LAC O ‘wit be shipped to you The smallest down pay grease. The LACO does away with all this! The LACO, by burning ALL of the oil in GAS form eliminates waste, thus providing clean heat, free from dirt or grease. This is an exclusive feature of the LACO—fully covered by U.S. patents—the LACO is the ONLY burner so equipped and the ONLY burner of its kind on the market! LACO OIL BURNER COMPANY 126 Union St., No need now to eiety. whet you can afford Oil Heat immediate! Write for Informatics! Tell type of heating system you now hat (hot-air or hot water, or steam) and menti# whether you have electricity. Special oft if you act now. Griswold, low Z ™ Bic {

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POPULAR MECHANICS ADVERTISING SECTION BE —_—_ RR. T. B, © * © WALUFES YOU TO MAKE MONEY AND ITS SERVICE KEEPS YOU UP-TO-THE-MINUTE ON THE pe gr. NEWEST DEVELOPMENTS IN RADIO, TELEVISION AND TALKING eee ome : ' yore , ape Easy UGA /. ee a iii ay =: . ve ney Making [7 ew | RTL Training [360 705125 % AWEEK . ; Rope BringsBugJobs Operator : , ] Tat Cae \ = Like These. i and Sone ig ‘cen , M ~ : i) yy. Ste) OOOIPVCR SY te Se ANN ‘ : epe ive @> © ge Radio Engineer | wae Sor Broad casting Station gos S Right at Your FingerTips “== IN 2 MONTHS WHEN YOU ARE RVI. TRAINED IN RADIO-TELEVISION “Talking Pichies ose? spare time work,as Bic Pay Joss! Spare Time Pror- me to isall ve a permanen: position wih my a our store. give you all the credit for the above. : R. L ‘Box 37, Greenville, Ky, tts! A Fine Business or YOUR Own! They’re all open to you and other live wire men who answer the call of Rapro. The fastest growing industry in the world n more trained men. And now come Tele- vision and Talking Movies—the magic sisters of Radio. Will you answer this call? Will you get ready fora big pay job Nowand stepinto a BIGGER ONB later on? You can do it EASILY now. R. T. 1. Home Training Puts You in This Big Money Field Radio alone, pays over 200 MIL- LION DOLLARS a year in wages in Broadcasting, Manufacturing, Sales, rvice, Commercial Stations and on Board the big sea going ships and many more men are needed. Television and Talking Movies open upother vastfields of money-making opportunities for ambitious men. FRED H. SCHNELL Chief of R. T. 1. Staff Twenty y: of Radio Experience. First toes- tablish two- = i raining — an you will like his friendly manner of helping you your ambition. y Quick Results “| You want to earn Bic Money, and you want some of it Quick. R. T. 1. “Three in One’”’ Home Training— Radio-Television-Talking Movies— will give it to you, because it’s easy, practical, and is kept right up-to- date with last minute information. In a few weeks you can be doing actual Radio work, making enough ExtTrRA MoNEY to more than pay for your training. In a few short months you can be all through— ready tostep into a good paying job or start a business of your own. A Big Jos—Bicg Money—A _ BiG Future. There is no other business in the world like it. Investigate—Send For R. T. I. Book Now Don’t waste a minute. Find out what the great Radio industry, which has grown faster than the Automobile and Motion Picture business, has to offer you. Find out what other men are earning. SEE How Easity You CAN SALARY RAISED 33 1-3% t into this great business that is live, new and up-to-date, where thousands of trained men easily earn $60 to $100 a week—where $10,000 a year jobs are plentiful for men with training -, distribu- jo Recet in lary of about 1-8% ur 8: Oot. PON, 618 BE. 6th St plus experience. Get STARTED. Get E. St. Easy To Learn At Home— the socks aboot sr meg In Spare Time adio, elevision @eere te wwe ew eee ee ee ee ee He and the Talkin Pictures, firsthand, in the big R. T. L. FREE Book. Learn what this R. T. L. **Three in One”’ Home Training can dofory i Mail the coupon for FREE RADIO & TELEVISION INSTITUTE Dept. 19 4806 St. Anthony Court, Chicago Send me Free and prepaid your BIG BOOK “Tune In On Big Pay” and full details of your three-in-one Home Training (without obliga- ting mein any way). Learning Radio the R. T. I. wa with F. H. Schnell, the “‘Ace of Radio” behind you is Easy, INTERESTING, really FuN. Only a few spare hours are needed and lack of ocueotion or experience won’t bother you a bit. We fur- nish all necessary testing and working appa- ratus and start you off on practical work you'll enjoy—you learn todo the jobs that pay real Book Now Name money and which are going begging now for RADIO & INSTITUTE want of competent men to fill them. \ Qf Address R. T R. T. 1. TRAINS YOU AT HOME FOR A GOOD JOB OR A PROFITABLE ° e =e PART TIME OR FULL TIME BUSINESS OF ‘ ‘ ' ‘ . _§ City

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56 POPULAR MECHANICS ADVERTISING SECTION

Don't let the world bluff = Get into electricity—earn $50.00 to 1$150.00 a week—and hold your head as high as the next man. You can do it easily. by coming to my famous electrical school. In 12 short weeks you'll pack in many years of practical knowledge. | You work shoulder to shoulder with expert instructors on full-sized ‘|moving, whirling motors, generators, batteries, switchboards, tele- No Education or Experience Needed phone and tele- No books to read. uate I guarantee ti Mc8 a soya sos ee} Big Ilhustrated ae —s > Site serie oe men get the biggest Book Sent FREE y doing. I don’t fitted to ‘Git 0 blesey job paying jobs. Every ‘oday, right tobe r a can't tell a I'll refund every penn: ree-and- of your tuition, . day eceive requests ic ‘pay 4 out vo that

THIS WAY for graduates. w gey we. Mall Ge Faseinating, Satisfaction Sapodaesst Higeretes hook 2 practical 2 You-ems theente tut le Tuition Offer. sho work in $4 ? eee \ ing. Your tuition will be’ 1 be Ss AH JUST MAIL y \ if, upon graduation, you are not com —_ - you. — satisfied. No facilities for colored students COUPON!

McSWEENY Pear Mac: Without oblicatin aned me sony of vou bis § ELECTRICAL SCHOOLS _Sreaaey aienanheen ta 4 | pay Dept. E-10-M, Chester at Thirtieth Address, f E32 Street, Cleveland, Ohio, or 263 Mad- erensernsenis te = } ison Street, Memphis, Tenn.

Ge" ‘‘ BECOME A LIGHTNING | Sogg) TRICK CARTOONIST \ Send $1.00 for Langh Producing LO BALDA ART SERVICE. Dept. 1. Oshkosh. Wis. Learn cake wast. Jewelrywork and Engraving A fine trade commanding nmcarant of Eni a seca Bo salary, and your services Co Sete rite Masterly English always in demand. Address Dept. P, Bradley Institute, PEORIA, TARE fore our latest catalog. re Education Hi Here in 15 7B. Home texts is complete High School Education. Every py? tau ant by fascinating “‘Question and Answer” method. Now used in 12,000 high schools. Certificate awarded It’s fun to learn this easy inexpensive repare-time wes. Coes bergete & in brain power. Dieser Send for Free Book Fin¢°3' hor, culture, Send hig ad with name <4 address for FREE booklet, ‘What a High School Education . pat School Home Study Bureau, 31 Union red ay 3379 New York, N.Y. Travel on “Uncle Sam’s” Payroll $158 TO $225 MONTH Mail Coupon Before You Lose It J FRANKLIN INSTITUTE, Dept. D171, Rochester, N.Y. ush to me, without charge, (1) Full particulars, ois hs how to Write and

2 d f 32- How LCE Ce rl eas ae aint 4 Many Other Government Jobs Obtainable «Name... .....-.ceccececeececeececececeecececeecececsccecncneceecees Steady Work—No lacations Common Education Suffic rf MEN—BOYS / Address Cr Lena sebbawnacebineneneasseooOw

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POPULAR MECHANICS ADVERTISING SECTION 57 eee ast asy Way to MORE Lc 6 Why work all your life for small pay and with little chance for a raise or promotion? Let me train you for Higher Class Work and Better Pay. Get my Pay-Raising Plan—NOW. [Pl send it to you FREE. It will convince you and show you a way to build a big future for big pay, on clean work leading to salaries of $60- — | $70,andupto$100aweeksalary. Money-Making Tools Furnished I Train You at Home Pec Gecuass say chateat Wo daw socks My practical working method makes every step made for practical drafting work. Bera | ee While You Learn .s Avisticn kes You can start earning {aviation tp Spot ta, “ money a few weeks after begin- pend to cnormerue prover my training. I give you special p—— a, ie Pit trata and tell you how to make money. gon, quick s at bome for Moter Bus Work You get these fine quali ne, im- Meter beiding ond ou g ese fine quality, genui motor bus, transportation = of draftemen = gaged in this work. I'll in learning drafting as clear as a moving picture. That’s why I train you so fast to be a draftsman. Employment After trai you I help you to get a —- Bm Money Back iy Not Satisfied job without eg zr you a cent for this can be mF without I train you under a positive Money-Back Agree- service. Employers of draftsmen come | $7727 a ment. If my training does not satisfy you after to me for men ause they know that srchitectural draftsman. you have finished you get every penny back. men I train make good. Mail This Coupon If You Earn Less Than*70aWeek : Mail this coupon now, and I will send you “My Pay- Raisin ae 3 Drafting Book and pees ule—postpaid and —¥ > Dobe, 2 ae iN 1951 Lawrence Av., Chicago i i f Service |§§ | _ Building “FREE”? Pay-Raising Plan H Div. ete yr cones Aves 13-$9 ® Please send me, free of all cost, “My Pay-Rai Plan”. also g EREE Drafting Book and Draftsman’s Fes ule. ALL H Name Age __& Post Office State

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58 POPULAR MECHANICS ADVERTISING SECTION Wouldn’t You Trade Jobs With Yi A transport pilot flying tri-motor planes—working six pleasant hours a day—earning from $5,000 to $8,000 a year. Wouldn’ yp - u trade your job for his? You can if you only try. ith proper training and experience you, too, can become a high salaried transport pilot. Learn Aviation by Flying Whether you intend to become a line pilot or plan to enter any of the dozens of other branches of aviation, you should know how to fly. Men who are doing big things in aviation today are flyers. So it will be in the future. Take a course in a Universal school — a school operated by the largest oper- ating system in the world — and get the kind of training and experience that really counts. Other Courses in Aviation Offered In addition to flying courses Universal Aviation Schools offer courses in Aviation Mechanics, Aviation Business, and for those who plan to enter aviation later, an Extension Home Study Course in aviation groundwork. Send for outline of training. “Take This Step Now! Get into aviation while the field is still open. The time to start is NOW. Investigate what Universal Aviation Schools offer you. Check the coupon below, fill it in and mail. Universal Aviation Schools A Division of The Aviation Corporation Universal Flying School . St. Louis, Mo. Universal Flying School . “Minneapolis, Minn. Universal Flying School . arion, Ill. Universal Flying School . - Oklahoma City, Okla. UniversalFlying School. . . . . . Rochester, Minn. Universal Fly ingSchool. . . . « « «+ «St Paul, Minn. UniversalFlying School. . . . .« « UniversalFlying School. . . . . « Universal Fiving School. . . ..-.-: Portertield Flying School a a ob ° a Cit CLIP COUPON HERE_ UNIVERSAL “AVIATION N SCHOOLS Suite 1047-56, Boatmen’s Bank Bidg., St. Louis Please send me at once your free book, “Aviation—What It Means To You.” I am interested in: O Flying Course 0 Aviation Mechanic’s Course O Business Course 0 Extension Home Study Course sas .. State > N332R101 BE A RAITDWAY TRAFFIC INSPECTOR active men 19 - 55 years old. outdoor work with regular hours, paying up to There’s a position and afuture in — ay Traffic Inspection for It's healthful, $250 per month plus expenses. Unlimited op- portunitie s—meet high railway officials—promo- tions rapid. Big demand for trained men. For 11 years we have been training men for this profitable, permanent profession. Railways look to us for men. We'll train you in a few weeks’ spare time home instruction, and upon completion, assist you to a posi- tion paying $120 to $135 per month, plus expenses to start, or refund your tuition. Rapid salary advances with experience to $175, $200, $250 per month plus expenses. Send for free booklet today. It tells all about Traffic Inspection— how we started hundreds of men to big pay jobs—what it can do for you—how we can assist you to a salaried position with rapid advancement. Send for it now. Don’t delay! STANDARD BUSINESS TRAINING INST. Div.2 Buffalo, N. Y. - Amazing Offer! PHOTOS ENLARGED Size 8x10 or 11x 14in. Only c each At last your chance to get alife-like Bromide photo- enlargement at a small fraction of the regular price reproduced from any clear photograph, tintype or snapshot ok ‘mail us. o photo too large nor any snapshot too small. We — guarantee return of your eciged. fou tan no in the same condition as re- 0 : 2ived. You run no risk. as you wish at price Simply mail us the Send No Money hoto, with your name and address, and in about a week Yoawill receive a beautiful enlargement that will never fade. We will alsosend with the enlargement an illustrated circular describing several of our most ular frames. From this circular you can choose the frame which we are giving FREE with every enlargement ordered in colors. On arrival of picture pay postman only 49¢ plus afew aoe Tae es r send 50c with order and we will prepay d we will ae your money. ial in- yof our ment done in Pastel sale only, DON’T mai each. ry BEAUTIFULLY CARVED FRAME—As a Guosment, to acquaint you => 07 high q el ork, we'll frame eve! | Water Colors—ABSOLUTELY FREE—during PUT IT OFF! MAIL YOUR PHOTO NOW! this sale aa —_—eee ARTWAY STUDIOS, F Room Check Size a Chicago, ill, Wanted Please send.......... ents from enclosed photo. I will pay Noy plus postage for each | [11 x 14 in. enlargement. (If 50c cash for each e ement | gx 10 in is enclosed with this order, pay postage.) uw fe Name “oso ws — —_mdahthGa ew -— +, i

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Cc osition ure in Traffie nm for althful, up to ed op- promo- 1€N. rT Naat wa SS POPULAR MECHANICS ADVERTISING SECTION 59 You Can Be a “Registered” Radio Technician i in90 Days! Tremendous Opportunities For Trained Men in This Fast Growing Industry The School of | of Milwaukee, home broadcasting station WISN and amateur station W9SO, now offers a complete prac- tical 90 days’ course in radio to ambitious men. This gres- electrical school is helping to supply the great shortage of trained radio technicians by giv- ing the most practical training ever before attempted in the radio industry. Federated Radio Trade Association Endorses S. of E. Radio Graduates la ~~ ne Read this letter from Michael Ert, Past Pres. of Wis. Radio Trade Ass'n, and now Pres. of the Federated Radio Trade Ass'n: “We have investigated your Radio and Broad- cast Course now being given at theSchool of En gineering of Milwaukee, and are acquainted with the high quality of edu- cational work you have been doing for years. Therefore, the Wisconsin Radio Trades Association hereby authorizes you to prepare men to receive Radio Serviceman's Reg- istration Cards, classes A, B or C, of the Wisconsin Radio Trades Associa- tion. FREE Mail coupon eoaay rs ¢ A of catalog describing the Course and our Earn- SWhile-You-Leere plan. Writenow! Classes Now Organizing. BOO GCHODL f E Founded 1903 The Wisconsin Radio Trades Ass’n now compels every radio service man to pass severe examinations and become registered. ealers are tired of un- trained, incompetent help. Radio trade associa- tions the country over are planning to follow Wis- consin’s example. The School of Engineering is the only institution in the country whose course is approved by a radio trade association. Graduates of theS. of E. are“registered.”—14 S. of E. men suc- cessfully employed by Radio Corp. of America Photophone, Inc, Most Thorough, Practical Radio Course in America Here in this big splendidly equipped electrical school (from which Station WISN is operated) you can secure in three months the most thorough, the most compact, peaotions radio training offered anywhere. Covers entire of radio! Complete course includes Radio Laboratory onto, Radio Telephony Theory, Radio Transmission, Code Instruction, Electrical Mathematics, Service and Installation, Radio Sales and Merchandising. Daily broadcasting from W ISN. All training is 100% practical. You learn in three short months! Part-Time Job While You Learn If you can finance your tuition we will assist you in getting part-time work to help pay living expenses while at school. Dept. P. M. 1229. me, without obligation, FREE S. of days’ Radio SEED c ccaccccmececcoccccecece ENGINEERING }i Iwaukee Omi Bi ibe Dept. P. M. 1229, Milwaukee, Wis. Pe csccccccescsscccceesecses Towers of Broadcasting Sta- tion WISN on School of En- gineering building. This station now being operated by School of Engineering. Television included Complete Radie Course also includes study of fun- damentais of Television and latest developments in that gigantic new field. Enables anyone to keep up with ress of this new industry. momo or ee Or nr ee eae School of Engineering, Milwaukee, W's., I am interested in your 90 days’ Radio-technician Course. Send BOOK describing course in detail, also particulars about “Earn While Learning" plan. TTTTTTIT TT TTL AGC. .cccce

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60 POPULAR MECHANICS ADVERTISING SECTION Let Slamming Doors PayYou ‘I5y. Amazing invention that ends all trouble, annoy- ance and expense of slamming doors, and brings fortunes to agents. Just one look at this clever device and the sale is made.- Can be in- stalled in a few minutes with just a screw driver. Saves nerves, besides enormous loss through broken glass and wasted fuel. Every office, fac- tory, store, institution, or public building needs one for every noisy door. Entirely New Principle— Works in Oil Kant-Slam is different from any other door control. It’s not pneumatic, but is built on new oil principle, that controls door like human hand. Gives lifetime service without adjust- ments. Always efficient in any weather. Amazingly Low in Price! Kant-Slam is neat, compact, light in weight and is lowest priced control ever offered with a factory guarantee. Pays big com- mission that makes agents $15 a day and more, easily, just showing it. Simple demonstrator does all the work. Just take orders and collect the big commissions in ADVANCE Mail Coupon for FREE OFFER NOW—TODAY! Is the time to mail the coupon for TRE- MENDOUS FREE OFFER. Get in on the ground floor and clean up the profits peing distribute ed among my representa- tives. Just open and shut mur de mstrator 5 or 6 tim day and you'll be making $30, $40 and $50 a week ou can wait because in, and in just a few minutes time. Demonstrate this clever device— tell how it saves thousands of dollars “ AMAZING as hand t at name and addre 88 on coupon belo yw, and I’ iT reserve your te rri- y for you. Kant-Slam Door Check Co. Dept. T-7 BLOOMFIELD, IND. KANT- ¥en DOOR CHECK CO., DEPT. T-7, BLOOMFIELD, IND. GENTLEMEN: Please reserve my territory, and send me full details of your AMAZING FREE OFFER I am not obligated. Name........0+ TIT ITT TITTLE TITTLE TTT Address...... COSC ecoccccceebocsccocerscoeoeocecoses DP thi¢eesveanue development. It is to-day fast becoming —10 Months to Pay SAVE $25 TO $100 All Electric With Dynamic Speaker Screen Grid Tubes The Ranger Radio is a result of7 years’ the most favorably known radio—now leading the field, as its predecessor, the Ranger Bicycle, has for 30 years. The Screen-Grid Tube Ranger Neutro- dyne (with 9 tubes) with 2 No. 245 tubes in ““Push-Pull” is licensed by R. C. A. Ranger assures you of selective recep- tion from near and distant stations. You may now own one of these distine- tive Rangers with Dynamic Speaker in a DeLuxe Console by paying as low as $10.00 down and balance Y RY ‘uneeen Write today Table models as low as $4( for big catalog Rangers come all ready to use—simply insert tubes and plug into your yom light socket—no more trouble than to connect an electric a LE CO. cision aD bes fora torr You ~~ pete 7 c% 4 te for marvelous new entgeduators otfer—easy terms % le DEPT. F173 CHICAGO 2 YEARS TO ENGINEERING DEGREE! Be a Civil, Electrical, Mechanical Administrative or Chemical EN- GINEER in 96 weeks. No entrance examinations or high school diploma required. Low pion expenses. rees conferred by State authority. Catalog FREE * Box E-9113 Angola, Ind. TRI-STATE COLLEGE ALWAYS Ask for DENISON’S—54 Years of Hits Comedy - Dramas, Vaudeville Acta, Farces, Musical Monologs, Dialogs, Comedies, Revues, Entertainments, Musical Readings, Comedy Songs, Chalk Talk Books, Min- strels, Bieckface Skits, Mahou Goods. . Ogtales FREE. T. S. DENISON & CO. Wabash, Dept. CHICAGO Heed th: Call to. Aviation. Quickly Train at Home for BIG PAY If you are seeking a big pay job, get into Aviation! Now—a complete, practical, EASY-TO-GRASP Course in Aviation fundamentals offered at a low price. We teach you—by Home Study—in the quick- est possible time the necessary preliminary steps to qualify tor position as Pilot, Mechanic, Designer, Motor Expert, Inspector, etc. _You are taught every branch of Aviation: Motors, ngs, Assembly, Construction, Design, Nomencla- ture, Flight Principles, Air Rules, Meteorology, Navi- gation, How to Handle Ship in Air and on ground and 100 other fascinating subjects. Profusely illus- trated with all necessary BLUE PRINTS, diagrams, charts, ete. Endorsed by Aviation experts. Accredited Diploma on graduation. All over America manufacturing, transport, : port service and sales organizations are springing up on ith valuable openings for trained men. FREE mployment Service. - Write today for your FREE copy of new book, eB Oo oO wR viation. oeneescsessecessee fF REE Book Coupon National Aviation Training, Dept. 120, 1031 So. Broadway, Los Angeles, Calif. Send me, without obligation, the Free Book “ Aviation” and details of your Home Study Course in Aviation.

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i ~ a = eee S ~ see = — S = poi \F) w >> eae - | Oe A: nite | ie qe <i ary aids rm | SSER2 | Me « Coupon NOW Mail This “BORN OVER AGAIRNY”

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POPULAR MECHANICS ADVERTISING SECTION VOU NOW! you can have the VOICE you want! 100% Improvement Guaranteed! No matter how hopeless your case may seem— send for free Voice Book. New SILENT Method of Voice Training. Increases Range. Improves quality. Banish huskiness—hoarse- ness. 100 per cent improvement guaranteed —or money back. Mail coupon at once for free booklet—the greatest voice booklet ever written—sent FREE with no obligation! Perfect Voice Institute, Dept. 13-59 1922 Sunnyside Ave., Chicago Mail Coupon for Free Voice Book | Perfect Voice Institute, Dept. 59 1922 Sunnyside Ave., Chic Sone Please send me FREE and without tobligation. Fest. Feuchtinger’s I have checked subject in ; new book, “‘Physical Voice Cate § which I am most interes 1 0 Weak Voice O Singing. 0 St ing 0 Speaking | i IID os antpcpasssdsanneenininennininieipptennemnanennnnamnqetninistmintitinigh DB BOG600...ccccccccncccccescasecocwcnecencoenccecaesosoccc= ; SS ee ee a A I ion. The 5 BOYS p teehee i“ AVIATION “The Eaglet” Only $300 A Genuine Duration Scale Model Very Light and Very Strong Specthcatinae: Built up model—wood frame. 20 inch wing n spr read. Fuselage 14 ches. WEIGHS ONLY. SEVEN- EIGHTHS OF AN OUNCE. This remarkable light weight has never fore been achieved in any commercially built scale model of this size. has flying qualities galore. ONDS You will get new thrills with this newest and finest type model plane. Wonderful results indoors as well as outdoors. Such a light weight, long flying, real scale model will be a Practically CRASH PROOF and The record to date is 92 SEC- revelation to you. to the one who sends in with this model. are included with every eagle me jel. Get ne price is low—order your model now CONSTRUCTION SET—Cx nks. Postage free. Eagie Model Airplane Co., I ha Heed- launched Send cash, check or money order. “Win Five Dollars in Gold”’ We are offering semi-monthly prizes of five dollars in gold the best flight record obtained Full instructions and prize entry blanks yours now and compete fo! mplete with all parts, plans, indtrustlons and prise $1.00. North Haven, Conn ve ee “*Eaglet”’ kit d hand-wound it never goes less than 1D ft. at about EAGLE MODEL AIRPLANE Co. DEPT. P12 NORTH-HAVEN-CONN. the prize awards, and aesembed it in one day. LERGY BROWN No stamps or-C, 0. D. Learn Without Study now open in Electricity Electricity is the power behind radio, telephoning and telegraphing; it ftur- nishes powerfor vast industrial plants; and is probably the most important subject in the world today This new edition of Electrical Engi- neering is full of important money making information so arranged that you canat once understand how to do many electrical jobs. Fit yourself for advanced electrical work by referring to these facts, through the JIFFY INDEX which makes them instantly available. Nolong hours of study; no tedious grind; put your finger on the facts —. _want to know and do it QUICK READ Your Way toa Better JOB - Electrical Engineering Revised Edition 8 Volumes, 4300 Pages. 3200 Illustrations Gold Stamped Flexible Binding. Jiffy Index— Vital facts instantly available ®#lectrical subjects fully covered, including -« C. radio practice Note: If you send now we willinclude FREE a consulting member- ship in the American Technical Society. E Eight Big Books Shipped FREE Yes, just your name and address brings ALL of these books to yor atonce. Pay only the few cents delivery charges, look them over, read them, test the Jiffy Index, find out anything Send me the 8 bi examination will and if satisfied t hat t | send you $2.00 and | total of oniy $34.80 you nothi you want toknow | READ before you decide BRI s dcensvese mploye: hana ne to keep them. L Emplover’s Non books on electrical engineering The American Technical Society, Dept. E919, Drexel at 58th St., Chicago, Ill. y the few cents delive | ese books will raise my — that $3.00 a month untiis | has been paid. Otherwise I w . return od hag oks collect in fifteen ance CA — am sending now, in or the mombership in the American Technical Bociety t REE

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n -gold tained blanks awards, nd prise ne day. t_ about sSROWN L D. dy oa JOB cal ring dition 4300 ns Flexible ital facts ailable bjects neluding practice end now le FREE mem her- merican iety .- FREE Oks to you — ‘ | ng for free POPULAR MECHANICS ADVERTISING SECTION 63 One Full Ampoule of my amazing Hairerbs fluid which I discovered myself and which grew hair on pe nny leg Don’t send any money. There is no C. 0. D. No charge whatso- ever. All I want is an opportunity to show you the fluid with which I grew hairon my own and on other men’s heads. Merely mail the coupon below for Free my Here is How I Used to Look [Lae fast on bald on this picture. _ooye withou It’s No Joke to Be Bald! These are exact untouched of Miss Augustine wot: ndo, 2500 Bast 25th Street, Cleveland, who was entirely bald and who had to oe weara Foun covering in the oneal soem. She was a very young lady ysicians, hospitals and clinics told her that she would be bald for life. She saw one of our advertisements, became interested — ~ be taking treatments with Hair- iy fast. A hairy fuzz be; to appear after twelve treatments. More hair came steadily until today Miss Raimondo has a full head of hair which is daily be- coming more luxuriant. This case is open to investigation by anyone. Yihet 1 cccomsiished on my own head and cn on other heade 5 believe I can do for you, provided ace cnder @ years of age ond lene of hair was not or other causes ae to abso- lately dead hair roots. Anyhow, | rust succeed or ag money is +. in ay I accordance wi O'cimels, cod cally copied wet oone® U po Mail this FREE-C oupont¢ REE co Mail the coupon today—Right Now—I will send you, immedi- ¢ different this new treat- ment is, ately, one full Ampoule of my marvelous Hairerbs fluid which I @ eres eee eee discovered, of which I hold the secret and which grew my own 5 we ates FO a pa on my own bald head. Besides the Free Ampoule of Fluid, @ ge 004 tol eee: J ill send photographs, names and addresses of men and women @ PICT WO! tne es ap cusseee ay used my Hairerbs Fluid for dandruff, falling ‘ en ae and loss of hair. RR et aa: Wer ean . --* oo" ---" VREELAND 27 ener i e cceee

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64 POPULAR MECHANICS ADVERTISING SECTION $OOa week NOW How did Ido it p Ask LL QCooke-HeH! show you how Own Shop Pays Big Money “You taught me allI know about Electricity. Last month I made $675in my new shop.”’ J.E.Ritch, Rt. No. 3, High Point, N.C. Now Makes $12 A Day “*A short time ago when I enroll- ed, I was a laborer at small pay. Now I make $12aday. Sure am well Satisfied with Cook Train- ing.” Robert Korns, 203. S. Maple, Newkirk, Oklahoma. That’s the answer of Fred YS: 1 Paris, Ark., when friends ask what put him on Easy Street GIRARD was just like you — just like thousands of other fellows strug- gling along on small pay—working long, hard hours with no chance for promotion and no hope of big money. Then he got mad at his lack of progress and asked this great Electrical School to help him. Now look at him. He’s got a fine job in Electricity—he’s making $100 a week and more —he’son Easy Street with a future that offershim all the good things of life. Why Don’t You Get Into Electricity, Too? You want quick success — you want Big Pay. Then why don’t you get into Electricity. Learn like Girard and hundreds of successful Big Pay Men learned — with the famous tried and proven L. L. COOKE “Work Sheet and Job Ticket” Method. It’s simple, easy, practical — just like actual shop experience, with the big compiete outfit of apparatus given you without extra cost. Yet it’s all done in your spare time, in your own home. If Making Less Than $60 A Week — Investigate Why earn only $20 or $30 a week when hundreds of “Cooke Trained Men” are making $60 to $100 a week in Electricity. Investigate. Find out for yourself all about this wonderful Training that has made “Cooke Trained Men the Big Pay Men” everywhere. Mail coupon for Big Free Book that tells all about Cooke Training, about the famous Money Back Agreement, and about the brilliant opportunities in Electri- city. Get this Big Pay-Raising Book. Mail the coupon at once. L. L. COOKE SCHOOL OF ELECTRICITY Dept. 19 2150 LAWRENCE AVENUE CHICAGO, ILL. [. L. COOKE SCHOOL OF ELECTRICITY te 2 Dept. 19, 2150 Lawrence Avenue, Chicago, Illinois You may send me, FREE and fully prepaid, your book “Secrets of Success in Elec- tricity,” with all particulars about your Home Study Course in Electricity. Name _ Address : “ - heiress oe — oe. _ State é THE COOKE TRAINED MAN IS THE BIG PAY MAN EVERYWHERE —_—— ———-- ADV! experier

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| rug. e for k of ok at nore ‘life. | get Pay J ork like ome, POPULAR MECHANICS ADVERTISING SECTION 65 lassitied ‘Advertisements WORLD'S BEST WANT AD MED Advertisements in this section, 35 cents per word, each insertion, minimum 10 words, payable in advance ky To be printed under proper classification in January issue, copy should be in our office November 18th ADVERTISING AGENCIES ADVERTISERS. Our 32 years mail order experience at your disposal. 68 page self- help guide, with United States map in colors, giving complete information best paying daily, weekly and monthly publica- tions sent free. Frank W. Lenhoff Adver- tising Agency, 66 East Lake St., Chicago. GET Into advertising. Learn quickly at home. Experience unnecessary. New easy plan. No text books used. Practical work. bid established school. yb —_ and ad- dress for interesting free klet. Page- Davis School of Rivertising Dept. 3437, 3601 Michigan, Chicago. ADVERTISE—24 Big S unday newspapers, 24 words only $15.00. Excellent for secur- ing agents, salesmen or business opportuni- ties. Catalog listing 1,000 dailies, weeklies, monthlies, mail-order publications, every- thing. Free. Wade Agency, Great Northern Bidg., Chicago. INCH Display qnee hes 50 maga- zines year $24. Wood's Popular . Services, Atlantic City, N. J. he ADVERTISE 50 Magazines 3c word; $3.00 inch; 5,000 country weeklies le line per pa- per; lists free. Evans King Co., 672P, Wil- mington, Del. ADVERTISING: 24 Words 8 newspapers $5; free list; magazines, farm, trade. Le- Grand Agency, 34 West 33rd St., New York. BEFORE Advertising get our catalog. No charge. 25 years in business. The largest classified agency in the world. Ankrum Advertising Agency, 100 No. LaSalle St., Chicago, 11. AUTOMOBILES TIME Counts in applying for patents. See pages 156 and 157. Clarence A. O’Brien, Washington, Registered Patent Attorney, D. C. See AUTOMOBILE SUPPLIES USED Air compressor, fully automatic, upright space saving type, beltless. Recon- ditioned and guaranteed like new. Shipped on trial and easy terms. Also a few test stands, car washers, battery chargers and paint sprays. E. M. Connor, Box M-1292, Troy, Ohio. GARAGE, Service stations: Make money with harmless, - odorless, non-freezing radi- ator liquid. Costs 25c gallon. 300% profit. Particulars $1.00. Frosproof, 509 Fifth Ave., New York City. “SPRINGS Of silence.”—Universal anti- rattler. For the noisy 4 wheel brake rods all cars. Ask your dealer. Universal Spring ‘o., Grand Rapids, Mich. SPEED Specialties. carburetors, motor and ignition parts, automobile ornaments, radio supplies, wholesale prices. Wireless cigar lighter 90c. Catalog and _ bargain list 10e. Green Engineering | Co... Dayton. OIL Gauge wiper. . Foe stantly. Readily installed. Only 10c. George Koch Sons, 2112 Pennsylvania St., Evansville, Ind. “TS Your ‘motor sluggish? Carbon re- moved and power restored overnight by simple method anyone can follow. Send 25c per cylinder. Money back if not satisfied. Motor Tonic, Box 521, Dayton, FREE—New 1929 Advertisers Rate Guide, Includes everything. Lowest rates. E. H. Brown Advertising Agency, 140 S. Dearborn, Chicago. “YOU Are wanted to resilver mirrors at home. Immense profits plating autoparts, tableware, etc. Write Sprinkle, Plater, 77, Marion, Ind. ADVERTISE In rural weeklies. Lists free. Meyer Agency, 4112 Hartford, St. Louis. Mo. = “TIME Counts in applying for patents. See pages 156 and 157. Clarence ’ Brien, seepptered Patent Attorney, Washington, OIL Pumping stopped. Spark plugs clean, same rings:in most cars. Simple idea for shop and owner. Detailed directions for ._ Ring extractor free. Motor Special- ties, Hinsdale, Tl. AUTO Carburetor attachment adds “pep” and speed; immediate start anytime; saves gas; no carbon. $1.25. Whirlgas, 816 Ford FOR ADVERTISERS Bldg... Detroit. ADVERTISE—28 Words in 62 different CARBEX, Automatic carbon remover. Al- country town newspapers, $3.40. Lists free. ad a — -—— i peite aw Mill B 4-M, Elmw Station, Syra- ».00. egular price $7.80. e Carbu- cuse, a “Y. . wane retor Man, 4437 Madison St., Chicago, Ill. “THE Master Letter Writer,”’ including 500 successful letters, by Ad-Man Davison, world-famous letter expert; 704 pages, $3. Circular sent. Opportunity Press, Westport, onn. SALES PROMOTION $50 TO $50.000 Daily sales secured for our clients. Though physically handicapped this client launched his present business 12 years ago with $20 borrowed capital. Today his sales are nation-wide. He is a recog- nized leader in his field. For several years our copy, counsel, plans have served to further increase his sales. 35 years sales- manship-in-print experience back of our campaigns. Submit sales problems for free diagnosis. 10 years Sales Promotion Man- ager Larkin Go., James C. Johnson, 118A Woodbridge Ave., Buffalo. LETTERS Worded to sell anything worth buying. Request evidence, naming your business. Jed Scarboro, South Orange, N. J. I SPECIALIZE Writing sales Tetters. Satisfaction guaranteed. R. M. Thompson, 504 W. Glensven, Youngstown, Ohio. MAILING LISTS BIG Free rate list describes 300,000 class- ified names. Many kinds; guaranteed cor- rect; priced right. De Muth, 88-15 82nd Ave., Glendale, N. Y. SEND $1.00 For 1,000 rural wWomen buyers names. Sheasgreen, PM1427 North Penn, Minneapolis, Minn. LETTER SPECIALISTS BUSINESS-BUILDING Mailorder letters —tirculars—folders—campaigns. Investigate! —— 7 Se 131P Glenwood, Jersey y N.S “WANT More mileage? Wonderful new humidifier (moisture) gas saver. All autos. One sent for test. Vix, RL-805, Wheaton, Il. AUTO Parts new and used. Lowest prices. Bankrupt supplies, motors, wheels, radiators, transmissions, generators, gears, carburetors, touring tops complete $15. Brakelining 50% off. Brightman, 2065 Main St., Hartford, onn. RADIATORS At wholesale prices. All standard makes. Satisfaction guaranteed. Send for prices, stating make and _ model. Independent Radiator Co., 1119 S. Wabash Ave., Chicago. AUTO SERVICE EQUIPMENT SAVE Money—Garage equipment recon- ditioned and guaranteed like new. Unusual bargains in test stands, car washers, battery chargers, air compressors, etc. Shipped on trial, easy terms. What do you need to complete your equipment? E. C. Galbreath, Box M-1294, Troy, Ohio. GARAGE Men, tiremen, service stations. The quick way to remove pneumatic truck tires from their rim without injury to either. Applies to all solid circle side mounted rims. Can be removed in from one to five minutes. $10.00 for complete simple illustrated in- formation. No machine. No further ex- pense. Reference Ladd & Bush Bank. Ad- dress J. E. Richardson, Lock Box 302, Salem, Oreg. ae —WANTED—Garages, mechanics, battery stations to nickel-silver plate auto parts. Big money sideline Write promptly. Lin- coln Engineering Company, 855-D South 37th, Lincoln, Nebr. sal AUTO Fervice station building plans: Write for plan booklet. Beeman, 656 Brent- wood, Detroit. BIG Opportunity in’8-hour battery charg- ing. Let me tell you how. you ¢an; install equipment with prattically no’ investment. Earn $150 to $300 monthly -from it. . Bar- gains in used. outfits. Write today.” Also haye a few reconditioned car washers, paiht spfays, automatic air compressors. - eG. Helmick, Box M-1293, Troy, Ohio. — “BATTERY Chargers for service stations. Several makes. New and_ used bargains. = price sheet. Adams-Barr, Columbus, Ohio. FOR FORD OWNERS WANT More Mileage? Wonderful new humidifier (moisture) gas saver. All autos. a sent for test. Vix, RM-805, Wheaton, AURORA Undersiung parts and 3.1 racing gears. Speedster bodies, headlights, hi com- peeeten head. See Sport Factories ad page “SPECIAL 1 price. Write City, Minnesota. MOTORCYCLES, BICYCLES AND SUPPLIES Model A Ford heater. Low Broquist, Mfgr., Chisago, MOTORCYCLES $25 To $50. Easy terms. Tires $2.50, frames $3, forks $3, tanks $5, wheels $4, chains $2, saddles $5, handle bars $5, engines $15, side cars $25, trans- missions $12, airplane engines $15, airplane wheels bicycle tires $1. velocipedes $7.50. Boake 50, new auto tires $3, used auto tires $2 50. Send 50c for ee a Price Cutter Deninger, Roch- ester, N “pO You like motorcycles? Then get Into business for yourself. Ride a shiny brand new Indian and own an Indian motorcycle shop for yourself. Write us and we will tell you how to get started on the road to suc- cess in work you will like. Indian Motor- oe Company, Springfield, Mass. Dept. MOTORCYCLE Bargains, lowest prices, bargain sheets for stamp, special aviators supplies, motoreycle accessories largest line in America, lowest prices. Largest motorcy- cle mail order house in the United States. Rochester Harley Davidson . 129 West Main St., Rochester, N “HARLEY-DAVIDSON Bargains at a tre- mendous sacrifice. All models and prices. Guaranteed. Send for our catalog, ‘‘Money Saving Motorcycle Bargains." Knuth’s Har- ley-Daridson Agency, 2525 Fond du Lac Ave.. Milwaukee. Wis. BARGAINS Used motorcycle cores i Cy makes. Goodyear balloon tires, $8.2 Dahl, 3661-63 Archer Ave., Chicago, “rit SEND Ise For latest used motorcycle catalog. All Indian Motorcycle Sales, Kansas City, Mo. MOTORCYCLE Parts, new and used. Lists free. Tower Cycle Co., Pine Lawn, Mo. AVIATION LATEST, Best and up-to-date aviation books Modern aan ge pages, 500 engravings. tion Guide, 256 pages, 140 illustrations. Price $2.00. ABC of Aviation, 160 pages, 150 illustrations. Price $1.00 Modern Aviation Engines, 2,000 pages, more than 1,000 engravings in two large volumes. Price $9.00 for the set. All these books are written by Major Victor W. Page. Also the latest book on the subject of “Aerial Navigation and Meteorology,” by Capt. Lewis A. Yancey, who made the fa- mous flight from Old Orchard, Maine, to Rome, Italy; 350 pages, 102 illustrations. Price $4.00. You make no mistake in or- dering amy of these books as they are all standard works, and some are used in 150 schools for instruction purposes. Any of these books sent prepaid on receipt of price, or just send us a card ordering book desired, and you can pay postman the price of book and postal charges when book is delivered. We publish books on more than 150 different subjects, and will send cat- alog on request. Norman W. Henley Pub- pas Company, 2 West 45th St., New Yo a AIRPLANES Motors and propellers har- gains. Smith, Box 1343, Houston, Tex.

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66 POPULAR MECHANICS ADVERTISING SECTION PROPELLERS 4’, $6.00; 5’, $10.00; 6°, $14.00. Propellers for snow and ice sleds, boats, road speedsters, canoes, hydroplanes largest stock of small propellers in the United States. Twenty years of propeller building plus mass production means better propellers for less money. We an the same day. Write for our free price list. The Crawford Motor and Airplane Pitenuteo- tory, Inc., Seal Beach, Calif. ’ HEATH Henderson motors are aircraft motors built by aircraft engineers. During 6 years of intensive flying we have refined this motor to the point of perfection. For aerial drive of sleds, boats, sea planes or WRITE For new free book, “Aviation.” Tells you quickest way to get into aviation, money earned, etc. Also describes new method of home-study training that is pre- paring hundreds of men for big pay jobs. Address National Aviation Training, Dept. 121, 1031 South Broadway, Los Angeles. PONTOONS, Pontoon-kits and blue prints are now available for the Heath Super Para- sol, America’s most popular sport plane, our ad page 162 this issue. 10¢ in stamps or coin brings large illustrated book- let. Heath Airplane Co., Chicago, Ill. ~““PIME Counts in applying for patents. See pages 156 and 157. Clarence A. O’Brien, Registered Patent Attorney, Washington, airplanes they have no equal. fac- tured motors may be had as low as $190 or brand new for $325. Send 10c in stamps or coin for large illustrated booklet. Heath Airplane Co., Chicago, Ill. Sale—Airplanes, fiying boats, air- lane motors and . Sheeplined eather helmets, $5.50; furlined, $8.50; special leather jackets woollined, $16.00; leather coats woollined, $18.00; sheeplined, $23.50; polarbear jackets, $18.00; leather breeches, $12.00; mnonshatterable goggles (oval) $2.50; one. $3.50. Logan Aviation, 716 Superior, Cleveland. INSTRUCTION -B ‘ook. Five hundred avi- ation questions correctly answered. Post- paid $1.00. Geo. Tuck, 73 South Shirley Ave., Pontiac, Mich. » eels ox +HTPLA} pair $12.00, — tires a $30.00; Russel sport gs, new, $100.00; Empenages, $12.00; "Clark Y ribs, $0.75; Lightplane glider supplies, circulars 20c. Kamm Air- graft Co., 524 12th St., Oshkosh, Wis: AEROPLANE Models and 6 cyl. air mo- tors, the finest to be had. Send 10c coin, new catalog motor driven models, 5 foot, rubber driven, 2 foot. Miniature Aircraft Corn., 83 Low Terrace, New Brighton, N. Y. “HEATH Propellers for the aerial propul- sion of sleds, boats or airplanes always gives the best results. They are made to fit the particular condition involved, accurately figured by engineers of 21 years’ experience specialized in air propulsion. 4c in stamps brings our propeller catalog. Heath Air- plane Co., Chicago, NEW And used sport plane motors, water cooled. Bergholt Aircraft Co., 143 East Lake St.. Minneapolis, Minn. ~ DURALUMINUM Construction set, pursuit type s ale seater. Straightaway and stunt fiver, $1.25 postpaid. Send five cents for manual; teaches building and flying this plane. Foster’s Model Airplanes, 5503 Hud- son Boulevard, North Bergen, N. J. GET The Tatest sportplane constructor book. Full of blueprints, photographs, drawings, detail instructions, ete. Postpaid $1.0 May save you hundreds. Circular free. Russell Aero, Box 455, Toledo, Ohio. “MODEL Airplane supplies. Send Se for large catalog. National Model Aircraft & Supnly Co. , 29 P. North Ave., New Ro- chelle. N. Y. LAT.ST Automatic tilting aeroplane model free with examination course on aerodynamics $10.00 Navigation without instruments $5.00; design $5.00; operation $5.00; meteorology ~ -~ by correspondence instruction. Model ithout course $2.00. Kasmar Rollicpter, 1070 Milwaukee Ave., Chicago. TEN Cents brings our new bargain list of light planes, motors, propellers, hubs and blueprints. Storms Aviation Co., Spartan- urg. 8. SPECIAL Sale on slightly used con- verted Harley motors and others, some as low as $25.00 complete with propeller. Send dime for bargain list and catalog. Sen- senich Brothers, Lititz, Pa. 2e POSTAGE Stamp will bring you com- lete model airplane supplies price list. owest in the country for its high quality. A. A. ©. Model Aircrafters, 340 East 188th St.. New York. ~THE American School of Aviation an- Nounces a new correspondence course in me- chanics of aviation. A thorough training in pract'cal aeronautics American School of Aviation, Dept. 1872, 3601 Michigan Ave., Chicago, Til. WACO Tens—Ox5 motors recently over- hauled. Several late model planes, first class condition. Priced from $1,200.00 up. These ships are bargains. Washington Air Ter- pina. National Press Bldg., Washington, Cc. ~PiOYS—Model airplanes supplies ft. Curtiss Hawk Flying Model Construction Set containing all necessary parts. 2.50. Baby R. O. G. Kit, 50c. Send Se for booklet. Hawthorne Model Aero Co., Hawthorne, N. J. “DRIVE Your ice-sled with your auto or motorcycle motor. Send 10c for price list of conversion parts. Heine Motor Works, Orwigsburg, Pa. ““BEVENTEEN Inch Balsaplane, guaran- teed flier, 50c. Catalog 5c. Marx Aircraft, 320 South Fourth East, Salt Lake, Utah. PLANS For constructing sport monoplane. Use Ford or Chevrolet motor. Bergholt Air- craft Co., 143 East Lake St., Minneapolis, Minn. ZEPPELINS! Boys! They're easy to build with our plans. Blue prints 3-foot models Los Angeles, Graf, Italia 50c a-piece. List free. Southern Aero Model . 1421 No. Washington Ave., Dallas, PROPELLERS For iodel , aeroplanes. Semi carved, 6’, 8°’, 10°’, 10c each. Any size. Aero Shop, 3050 Furlout Ave., Detroit, Mich. AIR Plane 150 h.p. Sisso motor for sale. $600.00. re A. J. Siucera, Box 583, We- a. “$100 FLYING Course. Six hours, includ- ing solo. Only $10 an hour for additional solo time. Allison Airplane Co., Lawrence, ans. SPORTPLANE—$25 Payments. Buy the Alco Junior coupe monoplane. We deliver the knockdown parts to you express pre- paid in eight convenient groups. Blue- prints sold separately, $2.50 per set of four big sheets. Allison Airplane Co., Law- rence, Kans. “BIGGEST, Best catalog model airplanes; parts, supplies; 5c postpaid. Ideal Com- pany, 19 West 18th St., New York. VARIOUS Sizes wood, reeds, bamboo. rubber band, wheels. propeller, onion skin covering and other supplies. Big bundle for 25c,. five for $1.00. No stamps. Will also send circular on free three foot model. Aero Shop. 3050 Hurlbut Ave.. Detroit. Mich. ~ PROPELLERS—1, $8.75; 5’, $13.25; 6, $16.50; Special Henderson propeller, $15.00: Aerodrive boat or sled blueprints, 50c each. Helmets, $3.00; goggles, $3.00, both only $5.00. Engines, fuselages. Ostergaard Air- eraft. 4303 North Narragansett. Chicago. BOYS: Get a pursuit tractor kit complete 35c. No stamps. Send for price list. W. & J. Aeroplane Shop, 200 Maple 8t., Wyandotte, Mich. BOOKS AND PERIODICALS 4TH EDITION, revised “Radio Theory and Operating,”” by Mary Texanna Loomis. The standard radio text and reference book America. 992 pages, 800 illustrations, flexible binding. Price $3.50 postage paid. For sale by hundreds of book dealers throughout America and many foreign coxn- tries. Or may be purchased direct from the ublishers. Send check or money order to omis Publishing Company, Dept. 18, Washington, D. C. ~INDUSTRIAL Alcohol. Wright's book. Full directions for making. fully “iMlustrated, $2.50. Spon & Chamberlain, 120 P.M. Lib- York, N. Y¥. erty Street, New ~HILARIOUSLY Funny book, "fhe Spe- cialist.’”” Generally known but seldom men- tioned subject. $1.00 postpaid. Smith’s Place, 153 Tenth Ave., Charleston, W. Va. "MASTER Key.” ™—400 pages” ‘psychology— Inspiration—Success. Handsome _ binding, $2.75. Phipps, 1014 Belmont, Chicago. PICTURES AND POSTCARDS FRENCH Lovers photos. Love scenes of French girls and fellows. Taken from live poses. Imported direct from France. 12 for $1.00. All different poses. Carrano Novelty Co., Dept. PM-D, West Haven, onn. MOVIE Stars pictures 5x7, 3 for 5c. 7 for 50c, 15 for $1.00; 8x10 25e pl. your choice postpaid. VanWart, 4816 Fountain, Hollywood BULLFIGHTING Scenes. graphic postcards $1. for Xmas greetings. Mexico City. Ten photo- Something original Brown, Box 7062, ART Pictures—220 all different. 160 cam. ples $1.00. Particulars 10c. Howard Sais Co., Dept. 15, Box 529, San Francisco, Calif, NOVELTIES, CURIOS, ETC. NOVELTIES. My big bargain envelope 5c. re L. chase. Burlington, N. J. World greatest aaabestie Bemeies with Mexican game card 35¢e. Hundred with five cards, $1.00. i ¥ or cash. Midwest Novelty Company, 1508 Main St., Kansas City, Mo ——— GAMES, ENTERTAINMENTS AND PLAYS PLAYS, Musical comedies and revues, minstrels, comedy and talking songs, black- face skits, vaudeville acts, monologs, dia- logs, recitations, entertainments juvenile plays and songs, musical readings, make-up goods. Catalog free. T. 8S. Denison & Co,, Wabash, Dept. 11, Chicago. VENTRILOQUISM—Complete course, 5h Premier, 1980 Dorchester Ave., Dorchester, ass. VENTRILOQUISM By mail—small com 2e stamp brings particulars. Geo. W. Smith, re §-373, 125 N. Jefferson St., Peoria, st MAGIC os BOOKS AND JOKER NOVELTIES “THE Book of 1,000 Wonders’’ explains many mystifying tricks with coins, cards, handkerchiefs, etc. Also, contains com- plete catalog of magic tricks, jokes, puz- zles, books, escapes, mind-reading acts, spiritualistic effects, illusion plans, curios and imported novelties. Largest assortment, lowest prices. Amaze and mystify your friends! Send 10c today. Lyle Dougias, Station A-5, Dallas, Tex. MAGIC—Tricks, Books and Supplies. Fo amateurs as well as the great professionals, Anyone can learn through our instructions. Feature Acts in Mind-Reading, Spiritual- ism, Rope Ties, etc. Large illustrated pro- fessional catalog, 20c. Chicago Magic Co., 140 So. Dearborn St., Dept. B, Chicago, IL f: cards. Easy to do. Pro- duce any card called for. Name any card drawn from pack. 6 tricks for 25 cents, in- cluding large catalog listing over 600 tricks. Wizard Magic Co., Dept. 15G, Bor 1055, Station “‘C’’, Los Angeles, Calif. MINDREADERS—1930 Planetary fore casts. 22-paged mauuscript 40c. Birth- date. Matthew, 5202 Avalon, Los An- geles, Calif. EIGHTEEN Magician's tricks, $1.00, including 29 pieces equipment, balls, dice, magicards, etc., and wonderful performing secrets. Weber, 647—KE4—62nd, Chicago. ~NEW Magic and joke catalog free. Eagle Magic. Minneapolis, Minn. “BOOK Of 153 magic tricks and big magic catalog, all for 20¢ stamps. Midwest Nov- elty Store, 1312 Main St., Kansas City, Mo. ~ BARGAINS! Cigaret ‘through handkerchiet 25c. “‘Cortini’s’’ newspaper trick, 25c. Cat- alogs, 10c, “Stringer’’, 3020-A, Shemeld, Chicago. MAGIC Catalog 20c. Lynn's, 105 Beach, Dept. 3, Jersey City, N. J “BOOKS, Magic “Sapestedl herbs, in- censes, perfumes, gifts, novelties. 100-page catalog, sample 10c. Marelle Company, 160 N. LaSalle, Chicago. “WAGIC Tricks and novelties. Send The for illustrated catalog. E. Kay Magic Shop, 8832 Commercial Ave., Chicago, Tl. SEVEN Magical Delusions and “catalogs —25c. Gilmagico, Morgan Park. Tl ELECTRIC Fun! Seventy stunts, 110 volts, $1. Kutting Sons, Campbell, Calif. CHALK TALKS LAUGH Producing program, $1.00. Cat- slog free. Balda, The Cartoonist, Oshkosh, Vis. MAKE ’Em laugh with magical cartoons. No talent needed. Entertain lodges, clubs and parties. G. E. Hendrickson, Argyle, Wis. STAMP COLLECTING FREE: Stamps from Bolivia, Roumania, Spain, Australia, to those sending 10c (coin) and 2c stamp for album with spaces for hundreds of stamps, free perforation cauge and packet of 80 different stamps 150 diff. stamps 10c, 4 Vatican stamps 10c, 10 Persia 10c, 20 Turkey 10e, 12 Cane Verde 10c.. Argonaut Stamp Company, Dept. 15, New Canaan, Conn MAGNICAROCIOUS Packet free—feaw- ties from distant lands. many richly colored, unusual designs. 2c postage. Empire Stamp Co., Toronto, Can.

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160 sam- rd Sales 0, Calif, es ~ el N Worlds Mexican 8 cards, Nov elty ity, Mo, —___ PLAYS — revues, , _bl ack- ougias, 8. For sionals, uctions. iritual- ed pro- fie Co, £0, ml . Pro y card nts, in-

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atalogs

POPULAR MECHANICS ADVERTISING SECTION 67 NOW On sale. 1930 edition Scott's standard postage stamp catalog. Cloth bound, $2.00; with thumb index, $2.50; for- warding extra, 3 Ibs. For sale at all dealers. On sale in December, 1930 edi- tion specialized United States postage stamp catalog, pocket size illustrated, $2.00. Post free. Start your subscription with the Oc- tober issue. Start the stamp year right by sending $1.00 for a year’s subscription to Scott's Monthly Journal. It contains a monthly supplement to the catalog, giving new issues and price changes, and it lists many exclusive bargains that will many times repay you the price of your sub- scription. Sample copy free. Scott’s Stamp and Coin Co., 1 West 47th St., New York, ™ MYSTIC “‘Queer Country’’ Packet! Con- tains scarce stamps from the following strange is: San Marino, Antioquia, Congo, Cy- prus, pa. Islands, Gwalior Hyderabad, Ice- land, Jhind, Kenya, Uganda, Lebanon, Mon- aco, North Borneo, Nyassa, St. Thomas Eastern Roumelia, ‘Siam, Sierra Leone, Tanganyika, Trinidad Tobago, Uban- gi, Upper Volta, Wallis Futuna, Alaouites. Get this wonderful packet of “ ‘freak coun- tries” and make your friends envious! Price only 10c to approval applicants! Write to- day. Mystic Stamp Company (Dept. 8), Camden, N. Y. 500 DIFFERENT Stamps for 25c. Big col- lection from Bosnia, Crete, Epirus, Hon- duras, Iceland, Kenya, Liberia, Malta, Nyassa, Quelimane, Siam, Zambesia and other “‘hard’’ countries. Catalog value $10. Price 25c to approval applicants! Bargains. 1,000 different 79c; 15 triangles 49c; 100 Africa 45c; 100 Asia 50c; 100 Balkans 35c; 100 British Colonies 30c; 100 French Colo-

nies 35c; 100 Portuguese Colonies 50c. Eight packets for $3.00! lIlustrated lists free. San Diego, Lema Stamp Co., 4231 42nd St., Calif.

ANCHERS $$$ Outfit—only 12c! Fine triangle stamp; set German stamps with (pre-war) value forty million dollars (in- teresting!); perforation gauge, mme scale; airmail set; scarce stamp from smallest re- public on earth; newspaper set; packet good stamps and Travancore, Malay, Dutch Indies, etc. Entire outfit for 12c to approval appli- cants! (Nice pocket stock book, value 25c, with every order!) Ageher Stamp Co., Box 1%. Rutherford, x A SNAP—300 erent foreign and 60 different U. 8. comen, including $1 and $2 revenues, all for only 25c. Free, with each order, our pamphlet which tells ‘‘How to Make a Stamp Collection Properly,’’ to- gether with our price lists of albums, sup- plies and hundreds of bargains in sets, packets, etc. Queen City Stamp & Coin pn Room 36, 604 Race St., Cincinnati, 0 UNDERSTAND Your U. 8. stamps. Just what you need. Our U. 8. library (illus- trated) gives full descriptions of all U. 8. issues. Volume issues 1847-1869, 50c; volume 2, issues 1870-1893, 50c; volume 3, issues 1894-1900, 50c; volume 4, issues 1901- 1929, $1. Tilustrated | 2 price list of U. 8S. and B. N. 50e. Our 32 page list of U. 8S. and B. N A. free on request. Stanley Gibbons, Inc., 38P Park Row, New York City, N. Y. DANDY Colonial set free with approvals. Wm. Monjar, 1551 Knox, Cincinnati, Ohio. THRILLING War scenes. A packet of all different stamps showing exciting scenes and records of nations at war. Includes siege guns; firing squad; mounted troops; pris- oners of war; fire-pot hurlers; hand-to-hand bayonet struggle; bloody battle scenes; troop transport; red cross stamp; dying soldier; victory stamps, ete. Send for this thrilling “Big Parade’ packet at once—limited sup- ply. Only 10¢ to approval applicants. A. Rowell, 58 Cornhill, Boston, Mass. 125 FOREIGN Stamps 30c. No duplicates. (eho Stamp, 101 Chestnut, Natrona, a.

U. S. 5 DIFF. Comms, 6c. 50% ap- provals. H. E. Sandstrom, 2412 Noyes St., Evanston, Ill. FREE, Necessary article and packet odd stamps for 8c, mailing costs. Kenley, 432 Chestnut St., ‘Westfield, N = UNITED States, Canada, Newfoundland price list free. Reliant Stamps, 65 Nassau, New York. 5 ICELAND Free to approval applicants. Edward Hammond, Auburndale, $s. FREE Canadian packet to approval | ap- Plicants. Postage 2c. Dominion, Box 222, Toronto, Can. RARE Congo airmail and 5 other air- mails in our packet. 61 different from An- tioqua, Hyderabad, Morroco, Oceanica, etc., 5e. Approvals and free lists. Monumental Company, .Arlington Post Baltimore, Md.

FREE! Largest stamp in the world! Fine packet 65 different stamps from Cape Verde, Jamaica, Mozambique, Syria, etc., ing dying soldier, beautiful women, ships, maps, savages, airplane, scenes, bird and animal stamps, for only 5e to approval ap- plicants. Largest Stamp in the World (Rare China Wild Goose Special Delivery) given absolutely free with each order. Sup- ply limited! Send your 5e today! Western Philatelist, 6021 Harper Ave., M12, Chi- cago. VIKING’S “Extraordinary” outfit!” Con- tains choice stamps from Iraq, Sudan, Jo- hore, Gold Coast, Cyprus, Travancore, Orange River Colony, Malta, etc.; scarce Mauri- tius revenue; largest stamp in world; packet French and Portuguese colonies; beautiful bi- colored charity set; and valuable premium. This de luxe outfit only 10c to approval ap- plicants. Bargain 1,000 different stamps 75c. Viking Stamp Co., P. O. Box 63, Sheepshead Bay Station, Brooklyn, N. Y. UNUSED United States stamps at face value. Your government has nearly 100 different stamps to sell to collectors at face value. Pamphlet describing Government Philatelic Agency, list of stamps it has for sale, and sample copy of “‘Washington Stamp News,”’ all for 10c. A. N. Nickles, 213 Seaton, Washington, D. C UNITED States $2 present issue (cata- logs 50c) for ten cents to approval buyers. State size of collection. Leduc, Redlion, Penna. WRITE For free samples South American stamp weekly. Semanario Filatelico, Peru 309, Buenos Aires, Argentine. ~500 MIXED I5e. 100 Var. U.S... 100 var, precancels, l7c. Charles Beugh, Elma, Wash. - “WRAP Dime, receiver over 100 airmail, triangles, old U. &., foreign. Bargain box, $1.00. 100 nice U. S., 35c. Philatelic Mis- sion, 533 Santa Rosa, Calif.

MOU? D Stamps, $10.00. for $1.00 Richards, W 44th, Shadyside, Ohio. SALVA jangle free with 100 diff. Greece, India, Japan, etc., 5 cents; appro- -. Frank Allen, 19 North Park, Auburn, m

STAMPS At Ie each; 125 vars., $1.00; su- perlative value. 300 vars., cheap but good, 35c. C. Ritchie, Watertown, S. Dak CANADIAN Commemorative, a complete set of 9 var. air mail, 5 beautiful picture stamps and 100 other stamps, all for 5c to collectors who ask for our approval sheets. Prices on approvals, %. %, %a lec, etc. Lowest prices and best quality. Keigwin Stamp Co., P. M., ea ru.

—FREE—1,000 Mixed U. S. stamps. Par- ticulars 2c. Weatherby, W oughby. “onto,

SELAD al with approvals. Bob ~~ “915 “-. Ave., Salt Lake City, Utah. KEDAH 5 Diff. We. Bargain fists free. Henry George, 985 Seventh St., Milwaukee, Wis. 35 DIFFERENT Egypt catalogs 90c for 15c; 25 airmail 10c. Ray Bovard, Fort Ben- ton, Mont. 4 FREE! varieties from Prussia, Bergedorf, Hanover, etc., cataloging thousand dollars free to all who send $1.00 for life subscription to our weekly bargain list. Maison Eugen Le Blanc, Ltd, 1754 Pry- tania, New Orleans, La.

y 4 Romay na, SPECIAL. Watermark detector, instruc- tions for use, stamps to watermark, etc., all yA, fifteen cents. Lake Stamp Co., Toledo,

IFUL Sets of Congo, Nyassa, mE. All for 10 cents. Lufberry Stamp, Branford, Conn. UNUSED ax: l0c. Bell Co., Box 455, Washington, D. ROU MANTA, Young’ king Michel, 3 va. nly 10c. SBargain list free. Rheaume, 7748 Henri Julien, Montreal, Can. 100 VAR ES. oreign stamps 10e to honest collectors. C. Taylor, Cross St., Newport, R. I. BIG Combination, including nice packet Liberia, scarce Turkestan, Sudan, Famine Stamp, Azerbaijan, packet others and fine pocket wallet. All for 10c to approval ap- plicants. Rogers, 1136 Woodland Ave., Houston, Tex. FREE Bargain list. Stamps from Hawaii, Cyprus, Gold Coast, Kena, North . 100 diff. and 2 old coins all for 20c. H. Rissmiller, 620 N. 12th St., Read- ing. Pa. 100 DIFF. Stamps and three months” sub- scription 10c. Philatelist, 56 Times Square Station, — York.

K— Beautiful French colonies to approval BP ants. Reference required. Adams, South Brownsville,

200 DIFFERENT A _ 10c; 50 different Portugal colonies Louis Morrison, Sharon Hill, Pa. FREE: 100 Diff. and price list to app. appl. against ref. 1,000 diff. 95¢c; 500 diff., 40c; 10 White Russia, 10c. Cherokee Stamp Co., 275 Hill Crest Ave., Macon, Ga. NETHERLANDS, 451-3 Free to approval applicants sending references. Beebee, 1252 Chestnut, San Francisco. “BEGINNERS Surprise packet tree te ap- proval applicants. Reference plea 3e —— Superior Stamps, Midland, Ontario, Ca RETTER Grade stamps, 100 different, Tist- ing over $6.00. Price $1.00. (No free junk included). Real investment. Bargain cir- culars free. Tropical Stamp Exchange, Pi- nellas Park, Fla. “35 AIRMAIL Stamps free with 3 mos subscription to livest stamp paper published for 25c. Stamp News, 1476 Broadway, New York City. 100 DIFFERENT U.S. stamps, 75 cents. Jungkind, Box 144-P, Little Rock, Ark. SAMOA, Siam, 3 each, 12c. Approvals. Simmons Stamp Company, Horton, Mich. GOOD Stamps on approval. Premium. G- Bloedel, Box 84, Hamlet, Ind. ~CONFEDERATE Essay Ly Tree with 200 different stamps for 12c. 1,000 fine mixed stamps 35c. Webers Stamp Shoppe, 1377 Park, Plainfield, N. J. ~ FREE Packet to approval applicants. Sutt- kus, 10234 Traverse, Detroit, Mich. MINT Blocks, 100 different e, Box 1387, Spokane, Wash. WHOLESALE: 100° Airmail 20c; 100 French colonies 20c. Alvin Johnson, Storm Lake, Iowa. ~STAMPS—50 Different foreign stamps; illustrated album; stamp hinges; perforation gauge; big illustrated catalog. Send 10c for complete outfit. Betts, Clearfield, Penna.

35 DIFFERENT Portugal colonies 5c. 25 different French colonies, 5c. Approvals. Hollub, Deland, Fila. aluable ates en- velope collection free. pi. - limited. 2c postage. J. G. Ferguson, 1910 W. 41st St., Los Angeles, Calif. “PANAMA Lindbergh packet: 55 different super quality, includes Lindbergh Panama, Canalzone, Central American, others. L. Lord, Pedromiguel, Canalzone. MY SPICE Islands. 29 different better grade stamps several from Kedar Johore, Malay states, North Borneo, Philippines Straits, ete., for 12c to approval applicants. Elder, 114 Pine, Wollaston, Mass. FREE Set Ukrania “unused _ to approval applicants entgees stamp. Monroe, Point Pleasant, W. Va 33 1-3% COMMISSION. Sell our stamps, sheet catalog value, $4. Our price, $2.00. Unsold stamps returnable. No investment required. References necessary. Lux Stamp Co., es Fairmont Place, Bronx, New York.

200 DIFFERENT Stamps 15c. Approvals. Michael, 942 So. 23rd, Bellwood, Ill. DIFFERENT Stamps 25c; Til, 1c; list, approvals. Robert Mosher, 323 New, Newark, J.

STAMP Tongs free to purchasers of oné 10c packet of 50 different from 50 different countries. Paul Revere Stamp Co., Box 40, Astor Station, Boston. her E % FREE 25 UU. S. with approvals only. Postage 3c Ref. Gaerte, please. F. E. 4707 N. Hermitage Ave., ‘ “jo DIFF. United States mixed 25¢. 70% approvals. Burton, Mad- ison, N. Tis STAMPS Five. _wW om h approvals. L. W- Hudson, Plainfiel< MISSION a - - A pound. 5 new Hebrides 10c. 4 Fiume Se. Lists free. Mech Stamps, 4512 No. “Racine, Chicago. A _ — Magazine. Finest monthly stam write for free sam- ple copy. Phitetetic’ ge oe Co., Ine., 15 John St.; New York, N se CU ER Taleseache Every country. Pretty—Intriguing—Cheap. Mint $5.00 rev- enue free to applicants with references. Van- derhoof, 1114 Logan, Denver, Colo FREE—7 Different Newfoundland stamps. Atlantic Stamp Co., 68 Garden St., Spring- field, Mass. FREE! Airmail packet with approvals. Aladdin, 1550 Carrol, St. Paul, Minn. 105 CHINA, Etc., 2c. Album (500 fllus- trations) 3c. Bul ard, 446 Tremont, Boston.

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Seater - vada St.,

68 POPULAR MECHANICS ADVERTISING SECTION FAR-A-WAY Land’s packet, including Zanzibar, San Marino, Orange River Colony, Union South Africa, Southern Rhodesia, Hong Kong, Transvaal, Malay tiger, Tri- angles, Air Mails, ete. Only 10c to ap- proval applicants. MeKwen, 755 Wilson, Columbus, Ohio. FREE. 5 Scarce African, 2c postage. Stamp Importers, Rosebush, Mich.

~3 CONGO Free to approval applicants. Edward Hammond, Auburndale, Mass. STAMPS—100 Varieties, Africa, Brazil, Peru, Cuba, Mexico, etc., 10c; 25 different U. 8. 25c; 1,000 mixed, 40c; 1,000 hinges, lie. C. Stegman, 5941 Cote Brilliante, St. Louis. Mo.

THOUSANDS Of stamps at le each—cat- alog values disregarded. Arrow Stamp Co., Winthrop Terrace, Meriden, Conn. bas FREE Outfit! 52 stamps, hinges, pocket wallet. Postage 4c. Approvals. Milton Angle, South Berkeley, Calif. ae FREE—Scarce two dollar postage stamp to purchasters of our superior British Co- lonial packet, only 10c to approval appli- cants. Globus Stamp Co., Dept. B, 214 Third Ave., New York. CONGO, Free, plicants. Bernard Karch, Bengies. Md. POUTH Central America, 40 different, T0 cents. Approvals. Croston, Box 25, Haver- hill, Mass. f3 PACKETS, Seis, hinges, albums, etc. U- 8., British and French colonies. Lists free. Carl Young, 1208 Chestnut St., Phila., Pa. ATTRACTIVE Assortment, Central Amer- ican with additional interesting unusual stamps, 2c postage only.. Midland Stamp Company, Toronto, ¢ Can. STAMPS Free. 12 large showy picture stamps, also 12 diff. British colonies for a request for my popular approvals at 50% discount. None better. Good supply of U. S. postage, 2c. P. F. Quinn, 1113 W. Ne- Philadelphia, Pa. FREG Stamps with approvals. age. Harvey Teeple, Decatur, Ind. 75% APPROVALS 3c; 1,000 Stamps 20c;

Ze post-

4,000 75c; well mixed. Geo. Best, Cedar Rapids, Iowa. ied Te ae ae WATERMARK Detector free! Approvals. Tatham Stamp Company, 49 Van-horn, West Springfield, Mass. . ONLY 5c! 10 Airmail stamps, including searce Latvian triangle stamp, Portuguese Red Cross set and 8 different Latvian Occu- pation stamps. Approvals and free lists with each order. Curhan Stamp Company, Glou- cester. Mass. ase TCOVERTCO Packet, 200 different stamps 10 cents, with 60% discount approvals. Co- vert Stamp, 39 State. Rochester. N. - STAMPS Sent on approval at 70% dis- count. Reference required. Emory Renoll, Hanover, Pa. FREE—31 Different stamps to applicants for Royal approvals. 2e return postage. Royal Stamp Company. Bristol, Pa. i DIFFERENT United States with latest pricelist 12c. Approvals at 60% discount. Seidenberg, Baroda, Mich “NEWFOUNDLAND” Means “Rev. But- ler.”” Collectors need my catalog (Tree). Rev. Butler. St. Georges, Newfoundland UNITED States stamps on approval. Ref- erence essential. Stamp House, 38 Torrey, Dorchester. Mass. BULGARIA—25 For 10c to approval ap- plicants. Cleveland Stamp Co., Caxton Bidg., Cleveland SPECIAL 500 Different from all parts of the world, 25¢ to approval applicants. Ohio Stamn Co.. Box 249. Cleveland. ~ SURPRISE Packet—Borneo. Congo. Malay, United States Commemoratives. Illustrated list, etc., to approval applicants 8c. Mose- ley. 4521 Parkview. St. Louis. Mo. 150 GOOD Mixed foreign stamps 3 cents. Stanton. Niantic. Conn. . FREE—$1.00 U. S. postag’ old issue free. if you write for our 56 page price-list of U. S. and foreign stamps. 2,000 illustrations. Also fine but cheap stamps on approval. Hussman Stamp Co., 620-3 Olive St., St. Lenis. Mo FREE—Canada (15 Var.) for new ap- plicant of my Ic, 2c and vad Sporevel. and also my 50% discount. Cha Schmidt,

P. 0. Box No. 4832, Frankford lg Phila, Penna. %e APPROVALS, Including Wiberia, Nyassa, etc. Also 14,000 averaging 1%c. Philatelic Exch., Huntington, References. W. Va.

110 DIFFERENT Stamps, many unused, high values, free fo collectors requesting our Net apnrovals. Postage 2 cents. Christen- sen, Milwaukee, Wis.

ONLY 25c For a five months’ subscription to The Stamp Collector, America’s finest stamp magazine. 100 all different stamps given free to each subscriber. Money re- funded if you are not more than pieased. The Stamp Collector, Dept. 15 Sedgwick Drive, Syracuse, N. 35 SCANDINAVIAN lc. M. Gustafson, 766 East, New Britain, Conn. ATTRACTIVE Approvals at 50% discou =e 25% discount. Noemus Stamp Co., 312 “ . New York. PENNY Approvals that Satisfy. Neil Gronberg, Box 5441, Philadelphia, Pa.

FREE! 115 Different stamps to approval applicants, 2c postage. Paige Stamp Co., Oak Park, Ill.

110 NEW Europe All Different, a won- derful collection cataloguing several dollars, free to collectors requesting our Net Ap- Postage 2 _ cents. Badger Stamp Co., Milwaukee, COMPLETE Sets on ‘approval. References necessary. Kenneth White, Rockville, Conn. FREE! Triangles, airmail, Iceland and 50 others to approval applicants inclosing 3c postage. Hawkeye Stamp Co., Cedar Rapids, 39, Iowa. UNITED States—Send on approval. Send me your want list. Ref. please. M. Hanna, New Kensington, I’a. 200 DIFFERENT hinges 10c. R. H. Temple. Salt Lake, STAMPS, 100 all different. Lists free. Quaker Toledo, Ohio. 24 VARIETIES Cuban stamps, 10 cents. List of 6,000 low-priced stamps free. Ad- dress Chambers Stamp Co., 111P, Nassau St.. New York City, N. Y. FREE 50 British Colonials, requested. Postage 4c. Co., South Berkeley, Calif BEST One cent approvals in America. F Hand, 1117 So. 60th St., Philadelphia,

stamps 10c; 1,000 Soe 380 W. So. Tt

Postage 2c. Stamp Co.,

if approvals Berkeley Stamp

101 STAMPS Free with approvals. Post- dohneen Stamp Co., (PM) James- ‘; *< DIFFERENT. A Zanzibar, etc., Floyd Marsh, apolis, Ind Arabia, Azerbaijan, 10c to approval applicants. 524 Hamilton Ave., Indian-

Of foreign stamps while they -000 or pound $1.00 (over 4,000). Approvals sent. Hinges 3,000-25c. Elmer, 61 t St.. Boston. 20 Different Argentine. Appro- List. Send 4c today for postage, etc. Reuter. Santa Ana. Calif RARE COINS RARE Coin book, 700 illustrations, 65 cents Exhibition of United States and colonial coins, 130 pages, 40 plates. $2.00. History and Issues of Penente Gofd Coinage of California, 1849-1855 Price $7.50. Latin-American Coinage, 500 pages, 2,000 illustrations, 6,000 coins. Price $7.50; postage. Foreign $10 plus postage. Money returned if not satisfactory. Wanted. old paper money (no Confederate or Foreign). juttag Bros.. 95 Broad St.. New York UNITED States commemorative half dollars. Pilgrim 89c. Monroe 89¢, Stone Mountain 79¢e, Lexington 89¢, Lincoln $1.19. Norse American $1.19, California $1.69. Huguenot $1.69, Bennington $1.29. Oregon $1.29, Grant $1.39, Trade Dollars $1.19; 10 large cents 79e; 10 two cent pieces 79c; 10 three cent pieces 89c: old coin and bargain price list ic. Arev. Box 483, Muskogee. Okla. 40 OLD Coins all different. $1.00; 100 different coins, $3.00; 100 different Ger- many war-coins, $2.00; 5 different porce- lain coins, 50c; 50 different Germany bank- notes, 50c; 10 different Mexico bills, 50c. Claud Deemer Box 315, Dallas, Tex. ~$0 DIFFERENT Coins 50c; 15 different —_ 25e. Oddehon, Box 681, Kansas City, Mo. OLD Money wanted. Do you know that coin collectors pay up to $100.00 for certain U. 8S. cents? And high premiums for all rare coins? We buy all kinds. Send 4¢ for large coin folder. May mean much profit to you. Numismatie Co.. Dept. H, Fort Worth. Tex. ~J0,000,000 MARK And list 1c.” Green- clay. Box 255 Denver, Colo. —ONE Million dollars in foreign money, 50c. Craig. 670 EK. 42d. Brooklyn, N. Y. CALIFORNIA Gold quarter 27c; half, 52e; $3 Georgia 1856. 20c; Connecticut 1787 cent, 60c; farthing, 5c. A. Wylie, 365 Wheaton, Ti BUYING List old coins, stamps free. Harrv Kelso. Pittsburg, Kans CALIFORNIA Gold $%-50c. Twenty coins 60c. Chester Brooks, Cuero, Tex.

COMMEMORATIVE Half dollars uncir- culated; 1920 and 1921 Pilgrim, 90 cents each; Lexington, Bennington, $1 each. Lin- coln, Grant, Oregon, $1.25 eac’ & Davis, Box 1791. Huntington, W. ROMAN And Chinese coins 25c.~ Dure 25 Mulberry, New York City. 10 CIVIL War cents, 50c; 10 hands foreign bills, 35c; 10 Confederate bills, , 10 historical medals, 50c; 10 Indian arrow- heads, 60c; 10 large copper cents, $1.00 Catalog free. Nagy, 8 P. South 18th, Phil- adelphia. BARGAINS Scarce coins; 12 dates large cents, $1.00; 3 2c pieces 25c; 5 3e pieces Se. 20c piece, ie; “100 different foreign $2.00;

\< ls

50, $1. 00; 25, 50. Romanocoinshop, Sprin g- field, ky zz 25 DIFF., Fine foreign coins, 55c,

12 diff. fine coins 25c. Wilibert Bishotf, Or- tawa, Kans. FINANCIAL War relics. Collectors de- rive lasting satisfaction from our free list. Pree 1629 Meyer Court, Chicago. $500 Each paid for hundreds of old Ed “ka all old money, it may be very valuable. Send 10 cents for illustrated coin value book, 4x6. Prices guaranteed Get posted. We buy and sell. Clarke's Coin Office, Box 5, Le Roy, N. Y. “RARE United States, foreign coins, war medals, Chinese coin and catalog 10c. Alexis Mengelle, Colorado Springs, Colo. AMERICAN Coins, bought, sold. Coin ues booklet, 12c. Frank Saco, 735 45th Brooklyn, “CALIFORNIA a, Se Geamer size, 27¢; $% size, ; piece and catalog. Ie. Norman Shultz, » *, 746, Salt Lake. Utah, GET Profit and pleasure in collecting old coins. Send 10c for large illustrated coin catalog. You'll be delighted with it. Send for it right now. B. Max Mehl, Numis- matist, Mehl Bidg., Dept. P, Fort Worth, Tex. Largest Rare Coin Firm in the U. 8, OLD Coins, large fall selling catalog of ceins for sale free to collectors only. Cata- log quoting prices paid for coins, ten cents. Villiam Hesslein, 101A Tremont St., Bos- ton. Mass. 3 DIFFERENT Fine bronze or nickel coin, 2 large crisp bank notes and catalog l0c. George Best, Cedar Rapids, lowa. UNITED States. Large cent, two-cent bronze, three-cent nickel and bargain list, 25c. Thirteen dates large cents, $1.00. George Coffin. Greenwood Mountain. Me. FOR BOYS EARN Christmas money. Order 50 sets Christmas seals. Sell for 10c set. When sold return $3.00, you keeping $2.00. No work—just fun. St. Nicholas Seal Co., Dept. 43PM, Brooklyn, N. Y. e BOYS! Subscribe for the “Trailer.” ‘Ue year. Valuable premiums free! The Trailer, 1529 Kominsky, Chicago CAMERAS AND PHOTO SUPPLIES BARGAINS: A few practically new items taken from our bargain book issued free: 2%x4% Eastman 1A pocket kodak, with f:

6.3 Anastigmat lens kodex shutter, $14.25, 10xl5em., Ica Trix Camera with Carl Zeiss le Tessar :4.5 lens Compur shutter, 3 plate holders and adapter $63.75, and many others. Get your copy now. ‘en days’ trial allowed. Central Camera Co., 230 8S. Wabash Ave., Dept. PM-12c, Chicago, Ill. EXPO Watch Camera. Every tick a pic- ture. Complete $5 outfit postpaid $3.98. “Fits the Christmas stocking.’ G. Gen- nett. Inc., 24 E. 13th St.. New York, N. Y. TRIAL Roll developed and 6 news stvle border prints 25¢ (silver). Klinkner Film Service. Dyersville, Iowa 8 TIME Counts in appiving for patents. See pages 156 and 157. Clarence A. O’Brien, Registered Patent Attorney, Washington, D. C

KODAK Films developed 5c roll Prints Se each. Trial offer. 8x10 enlargement 2%c. Sample holiday greeting card from your own negative 10c. Young _Photo Service, 405 Bertha St., Albany, N EARN Big money with "your camera in your spare time, using Halldorson Home Portrait Lamp. Write for booklet ““Home Portrait Photography’’ and catalog—both free. The Halldorson Company, 4748 N. Western Ave., Chicago. WAKE Money in photography. Learn quickly at home. Spare or full time. New plan. Nothing like it. Experience unnec- essary. American School of Vhotography, Dept. 3432. 3601 Michigan Ave., Chicago. _ SAMPLE Eniargement—dime, and neza- tive (returned) Trial roll, glossy prints, 25e silver

Brown, Warsaw, N. C.

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ents - ~ pie- Bs 98. Gen- N. ¥. yetvle Film See 3rien, igton, >rints | 25e, your », 405 ra in Home Home —hoth 8 N. Learn New innec- raphy, g0 nega- prints, HAVE You a Camera? sample of our big magazine, showing how to make better pictures and earn money. American p MASOEEOERT 116 Camera House, Write for Free Boston, 17, 3 ~ FILMS Developed. Special Trial Offer. Any Size Kodak film developed 5c, prints 3c each. Trial 6x10 Enlargement in handsome folder 40c. Overnight Service. Roanoke — fimo Co., 209 Bell Ave., Roa- e, Va. GERMAN Cameras. Lenses. Barttro, 129 W 3rd St., Los Angeles, Calif. MOTION PICTURES SOUND Motion Pictures! The great and only authoritative text book on this subject by James Cameron, world’s foremost author- ity. 400 pages complete information on all systems—Vitaphone, Movietone, Phototone. Methods of recording, maintenance of equip- ment. Complete information for projection- ists and all interested. Thousands sold. Send for your copy, $5.00 postpaid. Bass Camera Company, Motion Picture Head- quarters, 179 W. Madison St., Chicago, Ill. “$1,250 FOR Original photoplay story. Our sales department sold unknown author’s first story for above amount. We revise, copy right and market stories for both silent and talking pictures. ated in the heart of motion-picture industry. We know the de- mand. Established 1917. Free booklet. Universal Scenario Company, 206 en and ponte Monica Blidg., Helywoot, Calif. FEET $1.1 ew ts. Hoffman Film Service, 57 Broad, Bm N. Y. BARGAINS: Just a sample few, practi- tally new, 35mm., Sept camera, for motion or still pictures, large spring model, six magazines and case, $23.50, Sa Klix motion picture camera with & L Tessar :3.5 lens, 100 foot capacity, Par 50, second hand, 35mm., Hall prejectes, hand driven, electric illumination, $39.75. For other bargains see our bargain list issued free. Everything is fully guaranteed and ten days’ trial allowed. Central Camera Co., 230 8. Wabash Ave., Dept. PM-12c, Chicago, Tl. MOVIE Bargains. Felix-Gump-Mutt and Jeff cartoons, $10 each, Complete features, $15.00; single and 2 reel comedies, $5.00. 8 Remington, Box 524, Cincinnati, Ohio. BARGAINS — Excellent films, talking ont. projectors. Marshall Films, it, sold, exchanged. No- Ka, 195 Broadway, Paterson, N. J. MOVIE Cameras 50 ft. film, 99¢. Movie titles, Se ft. “No-Wat- Ka, 195 Broadway, Paterson, N. J. FILMS, Machines. Stamp for list.” Box 255, Hickman Mills, Mo. ~WMOVIE—Films $2.45 per 1,000 feet. post- paid. Comedies, ete.; odd reels drama, features, $1.95 per reel. A bottle of gen- uine film cement free. List free. Schole- mn Jr., 6801 So, Carpenter St., Chicago, 350 FEET New film $1.25. Searles, 130 Fisk St., Providence, R. I. BARGAINS: Machines, films, supplies, stereopticons. National Equipment Com- pany, Duluth, Minn. MOVID Films. Standard size, 250 feet Western or Comedy, $1.00 pestpete. Home Movies, Box 744, Minneapolis, Minn. TIME Counts in applying for patents. See Pages 156 and 157. Clarence A. O'Brien. a Patent Attorney, Washington, $2.25 Per reel; three motiographs reasonable. Hector Film Service, Champaign, Bought, FILMS $2-00 Reel, 250 feet $1.00; 5-reel feature $10.00. Werner-Leslie, 4442 South Broadway, St. Louis, Mo. FILMS—250 Feet 80c, 1.000 ft. 5 late news reels $9. oo Savarese, 149 Pali- sade, Union City, SPRING Motor 35m movie camera $25; movie projector, $35. Negative stock 2 cents loot. Pathex camera and projector, $33. Bargains in 16m cameras, kodaks, type- writers. Ray, 266 W. 46th St.. New York. “WANTED Young men—To train as theater Managers and theater advertising managers. Big opportunities. Theater Managers Insti- tute, Elmira, x. 1.000 FEET Of film $2.00. No Tists. Sunset Film Exchange, 298 Turk St., San rancisco, Cali f. wees. 200 Feet $1.00. Reels $2.50. List. Edgeworth Sales, Box 155, Blue Island, Ti. FILM Bargain (new) theatre size, natural color, Indians, cowboys, scenes, big stars, 3%e foot; sample 10c; no lists. Horizon Film %o., 37 Church St., Boston, Mass. POPULAR MECHANICS ADVERTISING SECTION THE Bass Bargaingram No. 198 hot off the press, culminating twenty years of suc- cess with a tremendous offering of bargains in rebuilt standard and amateur Mi»tion Picture Cameras, Projectors, Accessories, Text Books. The great bargaingram will be sent to you for 4¢ in stamps. Send for your copy today. Bass Camera Company, Motion Picture Headquarters, 179 West Madison 8t., Chicago, Ill. ~ GOOD Film—300 feet $1.00. Reels $2.45. Samples, lists, particulars for stamp. Eastin Feature Films, Galesburg, Il. NEW And rebuilt projectors for theaters, schools, churches, traveling shows Sup- plies and complete theater cusiguenta. Bar- gain prices. Free catalog. anaes Theatre Supply Co., MOVIE Films, 1,000 ft. >. $2.50 each; shipped anywhere on receipt of remittance. Particulars on request. Independent Films, 177 Golden Gate Ave., San Francisco, Calif. RADIO SETS AND SUPPLIES 3) RADIOS All makes Atwater-Kent, Ma- jestic, RB. C. A., and others. Hundreds— world’s best makes. Used, new and rebuilt. Going at $5 to $65. Many formerly priced at $150 to $300. Amazing bargains. Backed by responsible guarantee and 30 years’ ex- perience. Write for big free list today. TBrown’s Radio Exch., Dept. E, 3018 East 9ist St., Chicago. NEW 300-Mile “pocket” radio, $3.50. Complete with special loud receiver. No tubes or batteries required. Order direct. Snencer Laboratories, 116 Atlas, Akron, Ohio. RADIOS $6.65 And Free bargain list. Bright a, Radio. ” 5608 Milwaukee Ave., Chicago, mi RADIOLA cash, guar- anteed. Peak, BIT, ‘Boulder, Colo. s LIFELONG Underground aerial. Tess static, better reception. No lightning dan- ger, guaranteed for life. Only $4.00 pre- paid. Expert Radio Shop, 14236 Indiana, Detroit, Mich. TIME Counts . Seg ind for patents. See pages 156 and 157. Clarence A. O’Brien, or Patent Atierney, Washington, AMAZING! New! Phantom aerial elimi- nates outside aerial, enables you to hear new distant stations never before heard, small, compact. Instantly attached any set. Only $2.75 postpaid. Monarch Radio Corp., 8328 West Vernor, Detroit, Mich. RADIO World, only national illustrated weekly. Latest radio developments. Y dealers, 15c. 6 yearly. subscription 8 weeks, free “‘A’’ battery tester. Radio World, 145 West 45th St., New York. TRADE AND TECHNICAL SCHOOLS OUR Extension course covers entire sub- ject of radio. Graduates allowed three months finishing course free at the college. Tuition charge moderate. Have always placed grad- uates at pay ranging $150 to $300 monthly from the start. Write for catalog. Loomis Radio College, Dept. 7-A, Washington, START A business of your own. profits and no competition. Make harder and better granite than any from a quarry— beautiful, polished marble for 10c ft.—onyx, turquoise, agate, etc., at one tenth cost of natural stone—fireproof paint, l6c gal.— roofing, flooring, wallboard, terrazzo of all kinds. We teach formulas and methods. Write International School of Cement Arts, 443E Washington St., Portland, Oreg. J BE A blue print reader. Write for facts. See how men in your trade got to the top. What’s your trade? Carroll Ramsey, Drexel Bidg., Philadelphia. 69 BIG Free printing line brings easy quick profits. Union label. gger commissions —up to 55%! Experience unnecessary. Now write orders with America’s most profitable printing stationery line. ousands of free cuts. Over 150 standard items covering every business need: letterheads, noteheads, envelopes, billheads, business cards, state- ments, garage forms—shipping, battery, dry cleaning, tire, storage, parking and hat- cleaning tags; repair forms; blotters, gummed shipping, drug, advertising stickers, etc. Lowest prices, Steady repeat orders. Ship everywhere. New free outfit just off press. Write quick. Dept. 177, Box 498, Cincinnati, Ohio. LA he rder News—America’s pioneer mail trade journal. Quarter cen- tury old. Approximately 600 pages yearly of valuable information for ginners and es- tablished mail-order houses. Analyzes mail- order business, its opportunities. Practica- ble mail-order ideas, legitimate money-mak- ing schemes, instructive articles. Tells how to start, what to sell. Published monthly. a $3.00 yearly. Send 25¢ for sample copy. None free. Mail Order News, 500 Fifth Ave., New York. WITHOUT E xception most profitable op- portunity ever offered. Unlimited possibil- ities—plan unique—unbelievable results; small investment for advertising matter only; no stock to carry; permanent income; no effort required; tremendous number buy- ers developed automatically. We warehouse and deliver for you. Anyone can succeed with this most profitable of all sales plans. For full particulars write The Vineness’ Cor- poration, Desk K, 522 McKnight Bldg., Minneapolis, Minn. “LOIDLAC. Chemist’s amazing new dis- covery. Forever ending automobile polish- ing and repainting! Instantly restores all colors, producing hard, brilliant lustre- finish. Guaranteed water, sun and weather- proof. You make LoidLac from my guaran- teed exclusive copyright-protected formula for $1.40 gallon, sell at $14.00 a gallon profit! Write for exceptional offer. Miller, Chemist, 707 Jetton, Tampa, ARTIFICIAL Marble sanitary flooring in- structions, covering wood or cement flooring % inch thick, fireproof, waterproof, all col- ors, low cost. Ornamental casting, concrete, plaster, papier-mache decorations, garden furniture, statuary, flexible molds. 18 years instructing the public; particulars and illus- settens free. Chris. ahler, Huntington, HERE’S A chance to get into a perma- nent and profitable business with your earn- ings keeping pace with your ability. We teach you. You earn from the start. Begin in your own locality. You join a $12,000,000 company. A big, national advertiser. We have a place for a few more reliable men. Write Dept. “T,”” The Fuller Brush Com- pany, 3580 Main St., Hartford, Conn., for full particulars. SUCEED With—food—automobile—house- hold—toilet or medicinal specialties of your own. Successful manufacturer and adver- tiser—will teach a limited number of ambi- tious people—how to manufacture—sell and rapidly build up—a real—highly profitable— successful business. Little capital required. An ———s opportunity. Detailed in- — free. C. Ruskin and Company, 1501 Euclid Avenue, Cleveland. LEARN pestetsing all kind. Wood o etal with vitreous ce- ment, our new industry. It resembles pol- ished marble, onyx, granite, etc., flintlike hardness. For garden furniture, veneering concrete slabs, table tops, wallboard, every- thing, put on like paint gives glassy face finish. Membership inexpensive. Dime brings samples and literature. Cowell In- stitute, Grayling, Mich. concrete products HILES Watchmaking and engraving school. The largest and best equipped school in the west. 5330 Mission St., San Francisco, Calif. ~DRAFTSME @ an expert. By our method we train you quickly. Books and tools furnished. Write for illustrated cat- alog. Columbia School, 204P Drexel Bldg., Philadelphia. LEARN Morse and wireless telegraphy. Big salaries. Tremendous demand. Ex- penses low, can earn part. Catalog free. Dodge’s Institute, Fern St., Valparaiso, Ind. BUSINESS OPPORTUNITIES MAIL Order business your opportunity. Breniser’s famous hand books by expert 28 years’ experience show how to start selling articles you make or buy—all or part time— small capital. Fascinating, profitable. Set eleven books, $3.25. Breniser Company, 1607 P. Sansom, Philadelphia. Sample book, 25c, pay $3 for other ten if satisfied. START Business of your own, making in- vestigations, securing evidence for firms and individuals, with the Ace Secret-Phone. In- structions free. Ace Electric Co., 410 Edge- wood, Dayton, Ohio. GIANT Mail, plans, opportunities, sam- ples, etc., lc. Frank L. Chase, Burling- ton, N. J. MANUFACTURE Clever new toys, novel- ties, foods, preparations, mail order and agents’ specialties. Free list reliable plans, patterns, processes, commercial information. Manufacturer's Bureau, R20, 3937 Tracy, Kansas City, Mo as a STAMP Business for sale. Ytemized Vist, 10 cents. Lhernault, 1802 Amsterdam Ave., New York. BIG Money awaits you here. 250 signs and 7 an hour without press, type or machiner: Samples and Leber es Straco, 16°38 Mulberry, Springfield, O)

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—— ——— ee ere SE Pe RT aN as 70 POPULAR MECHANICS ADVERTISING SECTION LEARN To make molds and mold stat- uary, lamps, toys, vases and other easily sold specialties from imitation marble-lead-rub- ber-wax and 25 compositions. Commercial methods. Easily learned. Simple, _prac- tical, profitable. Free literature. Manu- facturer’s Bureau, R16, 3937 Tracy, Kansas City, Mo. DISSATISFIED Working for somebody else? Want your own business. Want to be your own boss? Start a distributing bureau. Easy. Profitable. No experience. No sell- ing. Start immediately. Opportunities every- where. Complete instructions one dollar. Particulars free. Wagner, Box 457a, Palo Alto, Calif. MAKE Your own electric vibrators, re- dueers and exercisers. We furnish all parts at wholesale prices—wheels, bases, pulleys, stands and vibrating belts. Send for cir- cular. University Floor Machine Co., P. ©. Box 68, Cambridge A, Mass. “MAKE Your own a ag Employ agents ourself. Toilet articles, soap, ye furnish everything. National Scientific Laboratories, 1935 Broad, Richmond, Va. “MIRRORS Resilvered at home. Costs near 5 cents per square foot; you charge 75 cents. Immense profits plating like new brassy, worn-off autoparts, reflectors, tableware, stoves, etc. Outfits furnished. Details free. Sprinkle, Plater, 127, Marion, Ind. “™ YOUR” Magazine subscriptions—Bargain prices savings up to $3. Porters Publica- tions, 9416a, 115th St, Richmond AHill,. “Joe WILL Bring Porter's Postal Success % ~~ (for dealers and beginners). Helps you ceed. Porter's 1; me 941é6a, 115 St, Richmond Hill, 400% PROFIT Belling imperted and American novelties. A $5.00 investment will earn $180.00. Valuable and useful samples. Complete information 25¢ (no _ stamps). Northwestern Novelty Co., 543-M North Ashland, Chicago. ARE You old at forty? See our adver- tisement on page 162 of this issue. The Electro Thermal Company, 2124 Morris Ave., Steubenville, Ohio. ’“AKE Money out of machines. Easy profits operating vending, musical, merchan- dising and amusement machines. Send 10 gente for sample copy. Automatic Age, 2239 . Michigan, Chicago. SS ete Starts profitable route péanut and gum vending machines. Partic- wlars free. Robbins Corp., Dodworth St., Brooklyn, N. Y. -_ CAPITAL—For copy, the “Promoters” Hand Book,”’ a leafiet on financing; an eye cpener for capital seekers. Send $1.00 to Amster Leonard, East Orange, N. ~ EXCEPTION: AL Bargain, latest improve- ments, homes in Washington and Virginia. Sonat 2551 17th St. N. W., Washington, WANTED—Man in each town to do elec- tro-plating. Easy to learn. Write promptly. Lincoln Engineering Company, 855-C South 87th, Lincoln, Nebr. “MAIL Order Selling.” 48” page maga- zine. New ideas each month. Three months’ trial subscription 25c. One year with val- uable a $1.00. Mail Order Selling, Brookfiel 1. DONT Fell for others—Employ agents yourself. Make your own products. Toilet articles, household specialties, ete. 500% profit. Valuable book free. National Scien- ag Laboratories, 1935 Broad, Richmond, a PROTECTION Information (mail rackets) 10¢. Challenge, P3802 Broadway, New 0 5 ~ START Own business from home or office. 50 ways to make money published in blue book of opportunities $1.00 prepaid. De- scriptive booklet free. Reliance Company, Prospect-Fourth Bldg., Cleveland. MONEYSAVERS! Lists, particulars, etc., for red stamp. Write now! Box 881, Glen Cove, J. GUARANTEED Honest,” workable money making propositions. Many lines. Little or no capital required. City or country. Send 10c for bulletin, Nebraska Technical Society, 801 Omaha National Bank Bidg., Omaha, Nebr. BUSINESS Profession of your own and earn income in service fees. See Steph- enson Laboratories, display ad page 154. PAYING Home business making Flora- graph, paintless, brown, black, white signs and floral prints rst day. No lettering ability. Printing through one makes an- other, reversing colors. Contrasting sam- p.es, 50c. New, organdy screen, shocard process worth $3.00 free with outfits. Laird’s Fleracraphs, 5925 Eggleston, Chicago. ~ OPPORTUNITIES Galore! Your address in The Eagle Opportunity Directory will bring you many money-making offers. 10c inserts your address one month; 25c three months; one year, $1.00. Marden, Box 25, Astor Station. Boston, Mass. CUNCKETE Building block manufactur- ing, is your home town opportunity. Par- tievlars free. Concrete Machine Co., 5 Main St., St. Louis, Mo. ST. ART Business of | your own. Blue book of spare time opportunities, just on. 100 money-making inspirational plans and sug- gestions. $1.00 postpaid or write for cir- cular. Standard Supplies Company, 313 Catherine St.. Syracuse, i * PROSPEROUS Business, full or spare time; big money in reconditioned lawn- mowers. New device sets and sharpens in ene operation. Start now, be ready for spring business, no experience mocoesaty we show you how. Complete outfit $7.50. Ace Sharpener Co., 2022 So. Twelfth Ave., ; May- wood, Ill. MONEY-MAKING Propositions for home workers and agents. Stamp appreciated. Jackson, 716 W. Exchange, Owosso, Mich. FREE Listing in Agent’s Directory.” Wolf, 6618 Quimby, Cleveland, Ohio. FR fooklet describes 67 plans for making $20-$100 weekly in home or office business of your own. Elite Co., 84 Eliz- abeth St.. New “AMAZING Screw-holding screw driver! Factories, garages, workers buy on sight! Profit 75c each. Exclusive territory. Free trial offer. Jiffy, 1273-A Winthrop Bidg., Boston. KING System mail_ order, co-operative idea. It’s different! Honest! Big profits! Details free. Evans King Co., Wil- mington, Del. BUILD A Business of your own. Sub- scribe to The Income Increaser, the only mag- azine edited by Edward C. Barroll, the well known advertising man and mail order writer. This 40 page magazine filled with the latest ideas, plans, schemes, pointers and suggestions comes to you monthly for only one dollar per year. Sample copy 10c. Income Increaser, 88 Pearl St., Boston, Mass. SELL By mail! Books, novelties, bar- gains! Large profits! Particulars Free! B-Elfco, 525 South Dearborn, Chicago. DELAWARE Charters; fees small; fre forms. Chas. G. Guyer, Wilmington, De. ‘MAKE Big profits with a fur farm th your backyard. Chinchilla rabbits, musk. rat, mink. Write for facts. 252 Conrad’s Ranch, Denver, Colo. I MADE $30 a week home. French bread- making. 15 years’ experience; free bookle tells. ‘Ashbrook 67, Marengo, Ohio. — AMATEUR Cartoonists: Sell your car toons. New le Smith’s Service, Pa. 1194, Wenatchee, “SCHEMER” Subscribers surely suc One reports $50,000 from one tip; | $25,000 from three Schemes; another $10,000 from one formula. Try your luck! Year, $1.00; three months, 30c. Patterson, Pub- lisher, Alliance, Ohio. FREE Book. Start your own little busl- ness anywhere, selling novelties by mail. My beginner’s outfit contains everything required, novelties, circulars, instructions, etc. scriptive book free. Hadwil, 3A-74 Cort- landt &t., New LEARN The collection business. Good in- come, quick results. Interesting booklet, “Skillful Collecting’ free. National Collec- tors Assn., Long St., Newark, Ohio. A BUS SINESS Of your own making— Sparkling Glass Name and Number plates, Sy signs. Big book and sam- ple free. E. Palmer, 540. Wooster, Ohio. CHARTERS: Delaware; best, che apest: free forms. Colonial Charter Co., Wilming- ton, Del. “COMPOSITION Floor making earns in dustrious men $12 and more daily if used as trade. Or make business of it with profits up to $10,000 yearly. Openings everywhere, Semi-Tile. Box 43, Hollis, Y. MAN In each town to plate auto parts, reflectors, bathroom fixtures, refinish beds, mirrors, chandeliers; by new method. No capital or experience required. Simple plan of manufacturing at home starts you in big money-making business. Outfit furnished Free particulars and proofs. Gun Metal Co., Ave. H. Decatur, Ill. AGENTS, Opportunity seekers. Make qasms profits. Write, Empire, Shawano, TELEGRAPHY LEARN Morse and wireless telegraphy. Big salaries. Tremendous demand. Ex- penses low, can earn part. Catalog free. Dodge’s Institute, H St., Valparaiso, Ind. CHEMISTRY *““ODD-THINGS’’—Money making ideas! Schemes! Plans! Tips! Opportunities ga- lore! New—different! Special three months’ subscription, 10¢ postage. ‘Odd Things,” 1516 Prospect, Cleveland, Ohio. EARN Money’ decorating Christmas cards; new easy method. Send l0c for samples and full @articulars. Walter Sharp, 5255 So. Broadway, Angeles, Calif. FOR Sale, coyrights to two books. Rea- sonable. Good mail order. Strong appeal to homeowners. Opportunity for somebody. Write Geo. L. Brockman, Laporte, Ind. MECHANICS, Painters, carpenters, start furniture refinishing, painting, handyman shop on nearly nothing; winning plan brings customers quickly. John Braceland, 1439 So. Ninth. Philadelphia, Pa. ASSOCIATED Chemists, Indianapolis, Ind. Write for formula lists latest house- hold toilet, automobile and medical spe- cialties. Long profits easily made. Analysis. “RESPONSIBLE Manufacturer wants com- petent men open office, manage salesmen; $200 to $1,000 necessary. Will pay ex- penses to Baltimore if you qualify. Ad- dress Manager, 603 N. Eautaw St., Balt- more, M THAXLY Formulas produce perfect prod- ucts. All lines. Catalog free. B. Thaxly Co., Washington, Cc, UNPATENTED Ideas can be sold. I tell you how and help you make the sale. Free particulars (Copyrighted). Write T. secens, 910 Barrister Bldg., Washington, ‘SIGNS And showcards easily ponmee If you use Letter Patterns. Write for free samples. John Rahn, B2120 Neva Ave., Chicago. MANUFACTURER Wants ible men to run permanent branch offices. Some money needed. Millions profits. Safeturn Signal Company, Washburn, N. Dak. TIME Counts in applying for patents. See pages 156 and 157. Clarence A. O’Brien, Registered Patent Attorney, Washington, SUCCEED With your own products. Make them yourself. Formulas, processes, trade- secrets. All lines. Catalog, circulars free. B. Thaxly Co., Washington. D. C. CHEMICAL Expert will furnish formulas and trade secrets. All lines. Lists free. W. L. Cummings, Ph. D., 228 Gordon Ave., Syracuse, N. Y. YOUR Chemical problems solved and for- mula or process furnished for $5.00. Write me. W. Stedman Richard, Industrial Chem- ist, Box 2402, Boston, Mass. BOOKLET Of experiments and chemical catalog 15ce. General Chemical Company, Box 397. Reading, Penna. “CHEMICAL Analysis, processes, techni- eal information. Robert Henderson, Labo ratory, Madison, Me. CATALOG Listing 2500 —‘iMlustrattons chemists’ supplies, 5,000 chemicals, 1,000 scientific books sent for 50c. Laboratory Ma- Chicago, ae Company, 643 E. 71st St., CHEMICAL Fin! Hundred home experl- ments $1. Cutting Sons, Campbell, Calif. FORMULAS AND TRADE SECRETS INDUSTRIAL Chemist furnishes form- ulas, processes; all lines. Moderate charges. Individual service. All inquiries answered personally. L. Clore, Industrial Chemist, Crawfordsville, Ind. ~ NEWEST Tested formulas. Particulars. Catalog free. Grinstead Laboratories, Os- wego, Kans. “FREE Formula catalog. Latest money makers. Western Chemical. Salem, Oreg STAINLESS Damask tablecloth. Looks like linen, washes like oileloth. yorum instructions, $1.00. Donahoo, Box 693, Hondo, Calif. WHOLE Tomatoes kept without canning. Secret 25c. ‘‘Erie,’"’ Waukegan, Il. WORKING Fecha $1.00. Henderson, College Station, Box 51, New York. MAKE Your own products. Employ agents yourself. Toilet articles, soap, aaeees. We furnish everything. Valuable book free. Na- tional Scientific Laboratories, 193 ¥ “proad, Richmond. Va. FOR Sale very valuable formula for prod uct, chemical seed treatment $.12 per actTé Joseph Modrzejeski, 873 Garden St., Mil- waukee, Wis. ~FORN Catalog free. fULAS All kinds.” € Clover Laboratories (P), Park Ridge, lil. BRO mula $ 216 Ca 3,000 Nationz

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s, bar- Free! Z0. 1; Tree n. Del arm Im musk. onrad’s “bread> booklet iT Care A-1194, ucceed. another $10,000 Year, » Pub- e Dusi- il. quired, . De Cort- ood in- 00k let, Collec- king— plates, sam- hio. eapest; ilming- remist, culars. s, Os money reg. Looks rmula, 693, nning. lerson, agents . We _ Nar Broad, BROKEN Dishes, glassware mended. For- mula $1.00. Guaranteed. Quality Products, 216 Cass St., Corinth, Miss. 3,000 V2 ALUA BLE Formulas prepaid $1.00. motional Service, 3937 Marburg, Cincinnati, Ohio. REL TABLE Formulas for newest fast sell- ers. All lines. Sources for fine labels-con- tainers. Start right. Free literature. Manufacturer's Bureau, R17, 3937 Tracy, Kansas City, Mo. 500 FORMULAS And big illustrated cat- alog 25c. Ideal Book Shop, Park Ridge, Ill. MOST Sensational formula bargain ever ered. Latest, best sellers. List free. Specialty Mfg. Service, 801 So. Farragut, Bay City, Mich. GUARANTEED Formulas, best science can luce for making popular, biggest-selling specialties all lines. Don’t buy formulas till you've received valuable eye-opening lit- erature. Miller, Chemist, 706-F Jetton, Tampa. Fla. DON'T Sell for others—Employ agents yourself. Make your own products. Toilet articles, household specialties, etc. 500% profit. Valuable book free. National Scien- ag Laboratories, 1935 Broad, Richmond, a. FORMULAS: Guaranteed, catalog free. Bestovall Laboratories, 6720 Oconto Ave., Chicago. SUCCEED With your own products. them yourself. Formulas, processes, trade- secrets. All lines. Catalog, circulars free. B. Thaxly Co., Washington, D. AGENTS WANTED AGENTS! You can buy 200 necessities di- tect from manufacturer for less than you can make them yourself in quantities you buy! Four big lines big-selling repeaters sold all over United States, Canada, and Australia: Good Health Products, Stock and Poultry Raisers’ Supplies, Soaps and Toilet Articles, Food Products, Insecticides, Cleansers; need- ed daily every home. All guaranteed exactly as represented by largest company of its kind in the world with four great factories—22 acres floor space. 10 branches—one near you. Cash or credit. Quick, easy sales. Good pay ever day. Steady repeat business. First come, first served. Write for particulars. W. T. Rawleigh Co., Dept. G-12 PPM, Freeport, Ill. SALES Representation now being arranged for 1930 all districts. ‘““My Golf Record’ sells to golfers, stationery, book stores and business concerns. seller; low price; big profits possible. Real business oppor- tunity. Pleasant, lucrative employment. Sample and complete information $1.00. Houston Advertising-Service Company, 3312 Sunset Blvd., Los Angeles, Calif. “SIXTY Meritorious big-profit mallorder Products, trade secrets. sales plans. Success assured. K. Home, 3949 Metropolitan, Chi- cago. eA BENTS Earn $240 month. New patented hot bag. Use 3 ayes cold water. Stays hot ten hours. Kraft sold 36 first day. De- mand enormous. No competition. Big commission. Write quick. American Ac- cessories Co., Room 1031, Cincinnati, Ohio. PERMANENT, Highly profitable oppor- tunity. Start your own business in your lo- eality, distributing nationwide patented well- advertised health machine. Quick sales. Big profits. Address “Opportunity,’’ Room 201, 2061 Broadway, New York City. AGENTS—Absolutely new! Our hand col- ored popular priced photo statuettes going big! Everyone wants them! Agents making $10-$25 daily! Samples furnished! Cruver Mfg. Co., MS2456 Jackson, Chicago. SAMPLE Copy opportunity magazine sent free to those wanting to represent leading manufacturers in their own community. Be ane —come, big money in Cay field. No experience required. Address Op- portunity Magazine, 750AA No. Michigan, Make Chicago. “BE Independent, make, sell your own goods, immense profits. Catalog dependable formulas, special selected agents’ best sellers free. R. Lustro, 4211 Cottage Grove, Chi- cago. NO Investment necessary to coin money with sensational “‘Gits Line” to stores. Your pay daily. No deliveries. Free outfit. Gits Co., F-5419 W. Chicago Ave., Chicago. SELL Christmas cards. Boxed assort- ments cards. Unusual value. Large p wees P. Ellis, 15 Wildwood Ave., Pitman, N. SELL Surety powdered hand n= — uct in great demand; no sales resistance; ecnstant repeat business; immense profits ae. Surety Company, 224 West Huron, POPULAR MECHANICS ADVERTISING SECTION MOST Unusual chemical development. New product for all —_ Prevents steam, rain and snow lurring windshield. Exceptional opportunity . distributors and salesmen. Exclusive territories open. Re- tails 50c. Send 25c for full size product and details. Walter 8S. Doe Co., Manufac- turing Chemists, Dept. 25, Kent, io. FAST-SELLING Specialties: Make them 71 CHICAGO Expert valued $3 stone at $900. The diamond's only guaranteed rival! Great- est spare time, side-line article ever known! Amazing profits. $5 pocket sample case free. Write quick! Mexican Gem Company, Dept. PM, Monterey, Calif. BIG Profits selling our brilliantly colored temporary window transfers to merchants for advertising sales and special events. yourself! Best formulas, processes; guar- Complete line arrows, symbols and giant let- anteed. Gerard Research Laboratories, ters. Permanent repeat business. Quick Wheeling, W. Va. returns. Print-A-Sign, Akron, Qhio. SALES Persons wanted for new foot FOOT-JOY Remedies, appliances. For- comfort appliance. Big commission, easy mula by foot specialist. Proven sellers, sales. Free sample offer. Ventopedics, 120 repeat business. Bellaire Drug Company, High St., Boston. Dept. 30,, Grand Rapids, Mich. AGENTS—To sell electric water heater for WELLS Cleared $620.00 In one month $2.75. New invention. Heats water almost instantly. Real moneymaker. Write Lux- Visel Company, Dept. N, Elkhart, Ind. BIG Money and fast sales. Every owner buys gold initials for his auto. You charge $1.50; make $1.34. Ten orders dally easy. Write for particulars and _ free samples. American Monogram Co., Dept. 40, Last Orange, N. J. MEN And women. I have two of the biggest money making propositions ever put on the market. $60 to $150 week. Write for particulars. Manager, 443 FE. Gist St., Chicago. AGENTS To sell our metal polishing cloth, powdered hand soap, furniture and Duco polish. Sales Mgr., 1307 East Walnut, Des Moines, Iowa. AGENTS Cleaning up on pearls and _jew- elry. Every woman a _ customer. Write Oriental Pearl, 246 Fifth Ave., New York. GENUINE Gold Leaf Letters anyone can put on store windows. Guaranteed to never tarnish. Large profits. Enormous demand. Free samples. Write Lag ate Letter Co., 438-D North Clark, cago. MAKE Your own —~ S, = agents yourself. Toilet articles, soap, ieee. _ furnish everything. Valuable book free. tional Scientific Laboratories, 1935 ‘Broad, Richmond, Va. RTRA en: not Pasco por- traits? We refund your money for all you cannot deliver. Frame catalog free. Por- trait Agent’s Supply Co., Dept. F, La- Porte, Ind. ere “WRITING Ink concentrates. Bottle your- self! Green, — = a black. Makes five qua Huge profit. Five as- sorted $1.00. Texply Color” Co., Somerville, AGENTS Earn $6 day. Bonus besides. Auto given to producers when earned. In- treduce new guaranteed hosiery. All styles, colors. Finest silks. Credit given. Write for sales plan. Wilknit Hosiery Co., Dept. 8231. Greenfield, Ohio. MAKE $20 Daily selling merchant's changeable letter show-window signs. Ex- perience unnecessary. Send ‘or free sample offer. Maze Company, 542 W. Washington, Chicago. wa STRANGE New electric fron cord! Pre- vents scorching. Saves electricity. Can- not kink or snarl. Used on telephones also. $25 daily. Samples free. Neverknot, Dept. 12-A, 4503 Ravenwood, Chicago. GENTS Earn guaranteed hosiery. y. §& nest line All new styles, big sellers. Big commission. Earn silk hose for your own use. Write quick. Silknit Hosiery Co., Dept. 1631, ‘Dawa. Ohio. FIs DAILY Easily ; made: great oppor- tunity men and women; experience unnec- essary; 95¢ profit on every dollar. A whirl- wind seller. Write quick. Particulars free. E. M. Nelson & Co., West Jackson, Box 324, Jackson, Miss. SELL “Koel s blue signs. ‘ost t, sells for 20c. Koehler, 717 N. Fourth, St. Louis, Mo. “EXPENSIVE Silk dresses: Slightly han- dled showroom samples sold cheap for cash. Peddlers, storekeepers, write Mme. Isabelle, P-65 Times Square, New York. “WORLD'S Greatest — t auto novelty.” Jazz- bird whoopee horn. “A Riot.” Sells for $2. Sample pomnets es or ¢ . D. Rico Sales, 166 W. 72d BIG Season on! wiste vine read Over- coats, sheep-lined coats, leather vests, flannel shirts; men’s, women’s underwear, sweaters, hosiery. Outfit free. May Co., Pancoe Bldg., Chicago. “WHERE To buy thousands of articles wholesale.”” New directory. Agents wanted. Pruitt, Brookfield, Til. 300% ee ha Selling Mystery Gas Lighter. Retails 25c. Costs you $1.00 doz. Samole free. Square Deal Mfg., Desk PM2, Bradford, Pa. with Business Guide and free legal service. Write for free outfit. Prof. Nichols, Dept. 65, Naperville, Til. $3 TO $10 Hourly d door check. Finger- touch shuts ‘i doors silently. No slamming. No broken glass. Keeps doors open when wanted open. priced. Big commission. No competition. Quick demonstration sells several to almost every home, office, factory, public institution. Write! Kant-Slam, Dept. TC-7, Bloom- field, Ind. AGENTS—Men, you can earn $12 daily wearing felt hats and showing friends. Smartest styles. Latest shades. $2 to $5 saving on every hat. Samples free. Taylor Hat and Cap Mfrs., Dept. TC-135, Cin- cinnati, Ohio. JUST Out—New kind of electric lamp. 101 lamps in one. So beautiful women can’t resist. So useful men buy instantly. Won- derful spare time or full time proposition. trating i Sell C. O. D. or deliver as you sell. Big profits daily. Write for money-making plan. Falcon Mfg. Co., Dept. 8-251, 2550 Sul- livan, St. Louis, Mo. TIME Counts in applying for patents. See pages 156 and 157. Clarence A. O’Brien, pocigtered Patent Attorney, Washington, AGENTS—Make a dollar an hour. Sell new kind of sharpeners. Sharpens all knives and tools quickly. Demonstrating sample a Premier Mfg. Co., Dept. 98, Detroit, ch AGENTS: Sell nursery stock. Free landscape service. Wonderful possibilities. Pay check weekly. Write for particulars. Perry Nurseries, R-12, Rochester, Y. > ante to demonstrate orders direct from motorists. Amazing mag- netic trouble light. Sticks on metallic sur- faces. Our men earn as high as $75.00 weekly. Write for demonstrator. Magno, Beacon Bidg., Dept. 169, Boston, Mass. —SALESMEN—Farn $100 weekly taking orders for dazzler and rain’ glow elec- tric signs. Big commission. Exclusive ter- ritory. High grade proposition. Write Chi- oem, Sign Sales Co., Dept. 83, Charlotte, AGENTS: Free catalog 200 household spe- cialties, toilet preparations, food products, portraits, frames, photo pillows, medallions, religious goods, pictures. Credit. James C. Bailey Co., Station C-12, Chicago. CASH Paid for Butterfiles, Insects. See Sinclair Display Advertisement on page 26. MAKE Your own products. Employ agents yourself. Toilet articles, soap, extracts. We furnish everything. Valuable book free. Na- Scientific Laboratories, 1935 Broad, Richmond. Va.__ MIRRORS Resilvered at home. Cos osts n near 5 cents per square foot; you charge 75 cents. Immense profits plating autoparts, rellectors, and take tableware, stoves, refinishing metalware, etc. Outfits furnished. Details free. Write Sprinkle, Plater, 128, Marion, Ind. MANUFACTURE Auto Specialties; Ra- diator Seal, Hand Soap, Puncture Plugger, Silk Life, Glass Cleaner. Get my free list. John Mickman, Chemist, St. Paul, Minn. MAKE Big money every day. Sell finest work pants and breeches. Every man buys 1 pair at $1.95, 3 pair for $5.50, your com- mission $1.00. Customer’s satisfaction guar- anteed. Largest, finest sales outfit free. Write today. Dept. 123, Longwear, 489 Broome St., New York. $2.45—RAINCOATS, All colors. Trench- coats, tweeds, alligators, leatherettes. Sam- ple coat and bonus workers. Beautiful outfit free. Bradley, Dept.AB- 12, 230 5S. Wells, Chicago. REPEAT Orders assured, distributing *“‘Lerdco” rubber specialties; generous profits, needed everywhere; excellent mail order proposition. Particulars free. Leredu Co., Park Row Blidg., New York City. 400% PROFIT Selling perfumes. rose Works, Box 731, Chicago, Ill. Mel-

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aor 72 POPULAR MECHANICS ADVERTISING SECTION SELL Rhinestone initial belt buckles, ete. Fastest Xmas sellers. Big commission daily. We deliver. Pocket outfit free. Chaton, 606 Blue Island, Chicago. MAKE More money selling most complete line raincoats, sportcoats, sheeplined coats, leather jackets and tablecloths. Latest styles. Lowest prices. Biggest commissions. 7x5 Swatch line free. Jeffrey, 716 Madison, Chicago. CHURCH'S New lacquered steel drip caps stop rain coming under doors. Dozen com- plete $3.50 postpaid. Sample 50c. Sells ue each. E. L. Church Co., Whitman, ass. AGENTS—Men and women with or with- out experience can sell our superior line of toilet and household specialties, combina- tion bath sets, etc. Big profits. Full par- ticulars on request. Dept. 22, W. C. John- gon Co. Atlantic Highlands, a Ve Book Matches, spare or full time. Big 4 peat business—no investment—every mer- chant a prospect. Send 50c¢ for selling out- fit which includes complete samples. Im- print Book Match, Dept. 119, 877 Meigs St., Rochester, N. $6.00 TO $15.00 Daily. Represent Tead= ing manufacturers. 1,000 immediate open- ings all territories. Salesmanager, 18 E. 12th, Dept. E, Cincinnati, WANT More mileage? — Wonderful new humidifier (moisture) gas saver. All autos. og sent for test. Vix, RO-805, Wheaton, FREE Booklet describes 67 plans for making $20-$100 weekly in home or office business J a own. Elite Co., 84 Eliza- beth St., rk FREE Teklct describes 67 plans for making $20-$100 wekly in home or office business of your own. Elite Co., 84 Eliza- beth St., New York. “AMAZING Screw-holding screw driver! Factories, garages, workers buy on sight! Profit 75c each. Exclusive territory. Free trial offer. Jiffy, 1273-B Winthrop Bldg., Boston. 100% PROFIT Selling watches. Agents, make over $15 daily selling men’s watches. Write how to get sample watch free. Guar- anty Watch Co., 119-P Nassau &t., New York. MAKE—Sell your own goods. We tell you how. Formula catalog free. Clover Labora- tories (PM) ,Park Ridge, Ill. AGENTS Buy hosiery direct at Towest mill prices. Men’s heavy silk and Rayon hose, doz. * $2.25-$3.50; men’s latest fancy hose, doz. $1.45-$2.10; ladies’ Pointex silk ho- siery, doz. $4.25-$7.00. Satisfaction guar- anteed. Act today. Superior Knitting Com- pany, Dept. 31. New Haven, Conn. nequaled window attrac- tion, ‘used by. thousands of merchants, offers exclusive permanent opportunity. Big com- missions, dignified selling, unlimited pros- ts. Splendid sales materials free. The Hustranew, 511 Chapel St., New Haven, Conn. oN _ AGENTS New style tablecloth. No laun- dering, hemstitehed, flannel back, several colors. Sells itself. Samples free. Puri- tan Mills, 43 Tremont St., Boston, Mass. 7 ‘arn $8 day. Sell finest Tine silk hosiery you ever saw. We furnish auto when earned. Earn silk hosiery for your own use. Write today for sales plan. Bet- terknit Hosiery Co., Desk 5431, Columbus, Ohio. CHRISTMAS Cards. Box, 21 cards, 21 fancy-lined envelopes. Sells $1. Large profit. J. Springer, Room 665, 1440 Broad- way, New York. INSTANT Hot water from light socket. Specialty salesmen, crew-men, agents say: “It sells itself—It’s an Oi] Well.”” Also fieldmen organizing. Salesmen and women demonstrators wanted everywhere. All or spare time. Work at home or travel. Ex- perience not necessary. Good pay. Send stamp for —— Dad’s Factories, In- ry lis n ~PHONOG wt eats Plays 50,000 rec- ords. $2.50, pre $1.25. Excellent side- line. Smit, 3605. ». Kingsbridge Ave., New York. 200 Weekly selling new useful article wanted by every home and business. K. K. King. Michigan City, Ind. LET Us send you free folder explaining 67 money making plans, home office. Raphael Co., 122 West 94th, New York. AGENTS: Shoe soles for ten cents. Spreads on with knife like butter. Waterproof, pli- able and wears like leather. Write for big money making proposition and no cost sam- ple. Universal Laboratories, Inc., Dept. 502, Des Moines, Iowa. 80c PROFIT On $1.00 sale! Splendid cleaner for automobiles, furniture, metal and glass. Your name on label assures you ail repeat business. Appoint your own agents and dealers. Earn $25.00 daily. Exclusive territory. Free sample. Minute Kleen Labo- ratories, Dept. E, Evansville, Ind. HOT Seiler till Christmas! Beautiful toilet goods assortment at $1.50 with 25 inch pearl necklace free to your customers, 100% profit. E. M. Davis, 238 North Ave., Dept. 530, Chicago. $8.00 DAILY Selling Ingerle. Exclustve designs. Pashioned at Naomi Shoppe, 1415 U_St. N. W.. Washington, D. C. x if PORTRAIT T Agents! Handle “Viking Brand” portraits. They deliver and satisfy. | pam ue A finished. Likeness guaranteed. owest prices. Viking — be (4 West Jackson Bivd., Chica a SELL Housewives 5 something Thay want A necessity. Reduces gas bills 25 New in your territory. No competition with this a one nae device. Exclusive sales rights. Jo profit. Box 18K, Ea San e Calif. wd )AILY, Showing $2.98 trench coats, also "Seoent's launderless tablecloths; gar- ment bags. Samples free. American, 726- MH_ Roosevelt, C hicago. $5.00 HOURLY. -Mercerized damask scal- loped table cloths. Size 58x58’’, 75c! Tre- —— demand. Other tisostes. Big sample line free. American Braiding, AM- 8 S. Wells, Chicago. n ~ WONDER Hotpad inventipn paying $18.00 daily. Banishes water bottle and electric pads. Sales helps. Experience unnecessary. Free sample offer. Applicator Corporation, 3357 Cottage Grove, Chicago. EARN More. Valuable book teaches. Literature free. Brookins, Warren, ~ VENDING Machine men—Grab — thiat $12.50 commission every call! New, different, low priced, whirlwind seller. Act quick. Postal Confection Mfg. Co., 2033 W. Charles- ton, Chicago. ~ STIK-TITE Sticks rubber, Teather, soles, heels on shoes, boots, rubbers. Use old inner tubes, tires. Outwear leather, cost nothing. No cement. No nails. Water- proof. Guaranteed outfit 35c. Distributors. Agents. Exclusive territory. Wonder Prod- ucts Co., 3617 Cimarron, Los Angeles, Calif. CAN Opener. Made for service; easily operated; does neat job; long life. Good seller. Write for price to agents. Western Wrench Co., 8427 South Chicago Ave., Chi- eago, Ill. ~ MAKE’ $2.00 Every hour. Sell every home wonderful preparation; mends hosiery, clothing without sewing. Invisible. Results guaranteed. Send for free sample of work. —— City Lab., Dept. PM-12, Cincinnati, Ohio. GO In business for yourself and sell our home motion picture equipments on com- mission. Write National All-Movie-Sales Co., 333 N. Michigan, Chicago. DONT Sell for others—Employ agents yourself. Make your own products. Toilet articles, household specialties, ete. 500% profit. Valuable book free. National Scien- a Laboratories, 1935 Broad, Richmond, a. AUTOMATIC Hand power nut cracker. Fast, accurate. Two models, $8.50-$6.00. Agents can clean up. Clarky Nut Cracker, Harrisburg, Pa. STOP: 400 Fast selling specialties from many parts of world. Write for free whole- sale catalog. See ad page 187. Spors Co., Lesueur Center, Minn. ARTICLES Of merit.” Repeat sellers. Big profits. For information write .—— Prod- ucts Co., 616 W. Kinzie St., Chicago. SELL Holiday Greeting Seeks “Some- thing different. 200% profit. Sample free. 3330 Telegraph, Oakland, Calif. EMBOSSED _ Signs. Something new. Going big. Ten cents for twe samples. Signs, 3328A Telegraph, Oakland, Calif. ~AGENTS—Speed filter.” Guaranteed filter beverages crystal clear, one gallon minute; new invention. Sparkler Mfg. Co., 448 West Grand, Chicago. DON’T Sell for others—Employ agents yourself. Make your own products. Toilet articles household specialties, etc. 500% profit. Valuable book free. National Scien- a Laboratories, 1935 Broad, Richmond, GET Into aviation! Earn $35 to $109 weekly. World’s fastest growing — Factories and airports need traine Unlimited future. Learn in ay dant Amazing home study method qualifies yoy in few short weeks. Personal, Practical help of veteran world-war flyer. Employ ment help free. You must be over 18. Rush name, address for special tuition offer and illustrated book free. Write Major Rock. well, Dayton Schooi of Aviation, Desk SC-], Dayton, Ohio. $10-$25 DAILY Simply showing new Polly wrench. 10 wrenches in one. Guar- anteed seller. Sample free. Gellman Mfg. Co., Dept. 6K, Rock Island, TIL AGENTS Wanted—Practical and moat used necessity of the present day. Sold ong money back guarantee. © Es-Ton Com- pany, La Salle, Ill. GREATEST Opportunity; rewest proposi- tion. Build continually paying business in your own name. Household, industrial, brushes, brooms, mops, dusters, fully guar- anteed. New catalog, all net prices, no dis- counts to bother with. Make as high as 300 per cent and over. Write today. Wire Grip Sanitary Brush Corp., 41 East 11th Street, New York. GENTS “Strike a gold mine” selling Nalestso cloths at 25¢; cleans, polishes ail metals; the duller the metal, brighter it shines. One agent sells 102 boxes in 116 calls. Write for free samples, particulars. ae Mfg. Co., 20 Shef Bidg., Weehawken, AG terling’s ““Anti-Freeze”” Keeps frost off windshield. Sample 50c. Ster- ling Laboratories, Cedar Rapids, Iowa. FAST Seller—Big profits.” Every house- wife, automobile owner, etc., will buy “Kwick Kleen” for windows, mirrors, fur- niture, store fixtures. Sample 35c. Sales plan free. Sterling Laboratories, Cedar Rapids, Iowa. “NO Dull times selling food. People must eat. Federal distributors make big money; many over $3,000 yearly. No capital or ex- perience needed; guaranteed sales; unsold goods may be returned. We furnish you with license, sample case and free samples for customers. Repeat orders sure; ex- clusive territory. Ask now! Federal Pure Food Co., A2307 Archer, Chicago. “ENGRAVED Name pilates, signs, num- rs, desk plates, store window signs, etc; profits large. Brett Bros., Winthrop, Mass. “SELL Stores 5c candy specialties. TO profit. Lorrae Products, Albany, N. WANT Distributing agent for renal powdered handsoap; removes anything from the hands without injury to skin; everybody a customer; great opportunity for hustler te get in business; sample free. Solar Prod- ucts Co., 32144 So. Troy, Chicago. “BIG List of Christmas sellers! Greeting ecards, combination toilet sets, perfumes. More than 400 items. Details free. Write! Togstad Co., 30 Punion St., Kokomo, Ind. SELL Complete line household brushes. Send for free catalog and sample case offer. National Brushes, St. Louis, PHOTO Medallion men and women, the largest line of photo novelties in the world Lowest prices, quickest service. Send for catalog showing over 200 money makers. Photo medallions, photo medallion clocks, photo mirrors, photo fountain pens, ph powder compacts, photo jewelry and pheto buttons. Gibson Photo. Jewelry Co., 608- 614 Gravesend Ave., Brooklyn, N. AGENTS—Moseo Corn and Callous Re- mover will build you a steady repeat busi- ness. Send today for pocket-size trial out- fit. The Moss Company, 442 Searle Bidg., Rochester, N. Y. BIG Money applying gold initials on automobiles. Fasiest thing today. No ex- perience needed. $1.45 profit every $1.50 job. Free samples. “‘Raleo,”” X-1043 Wash- ington. Boston, Mass. “BIGGEST Surprise offer ever made. Be sure to answer this ad. My line of soaps, coffee, tea, spices, toilet articles, household specialties, pays you bigger profits. M. G. Roth, President, 2716 Dodier, St. Louis, a SUCCEED With your own products. Make them yourself. Formulas, processes, trade- secrets. All lines. Catalog, circulars free. a Thaxly Co., Washington, D. C. a ELL Men’s neckwear—wonderful propo- sition. Astor-M, 39 East 28th, New York. a Money weekly year round appoint- ing agents. No canvassing, delivering or investment. Mother Hubbard Foods, 554U Congress, Chicago. “A REAL Money-maker. Sells everywhere. Metal polish in tubes. Trial tube free. P. M. Reid, 1619 Clark, St. Louis, Mo. REMNANT Store, Bethel, Ohio. Greatest Dry Goods Bargains on Earth. Agents and Dealers. MONOGRAM Automobiles, $1.35 Profit tea minutes’ work; every owner wants them; mil- lions without; particulars free. Motorists Accessories Co., Mansfield, Ohio. spec Bui pre ‘cae Ol ee 1am ar

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ost, ld ona | Com- Troposi- ness in ustrial, guar- no dis- as 300 reatest ts a fit tem 1; mil- torists POPULAR MECHANICS ADVERTISING SECTION 73 START An honest-to-goodness, successful- paying business that’s yours. Making world’s greatest sellers! Investment small. Profits great. Start anywhere. Get my valuable “eye-opening”’ literature about specialty man- ufacturing—How you can easily make guar- anteed exclusive automobile specialties, in- eluding wonderful LoidLac, finest household cleaners, best soaps, high-grade toilet prep- arations, modern insecticides, delicious food and beverage lines fastest-selling carded specialties. 32 years unequaled reliable service. Miller, Chemist, 706-J Chemical Building, Tampa, Fila. ‘HOW To Secure Agents,” a specially prepared booklet, tells of one of the most inexpensive methods in which to secure good live producing agents. It is free; write for your copy today! ». ke Be Mer. Classified Advertising, Popular Me- a a, 200 E. Ontario St., Chi- cago, 5 “DON'T Sell for others—Employ agents yourself. Make your own products, Toilet articles, household specialties, etc. 500% profit. Valuable book free. National Scien- = Laboratories, 1935 Broad, Richmond, ya. SELL “Prevents Runs.” Guaranteed to prevent runs in silk hosiery. Large profits. Particulars. Specialty Mfg.. 307A West First, Los Angeles, Calif. AGENTS—Make a doilar an hour. Sell Mendets, a patented patch for instantly mending leaks in all utensils. Sample pack- age free. Collette Mfg. Co., Dept. 404, Amsterdam, N. Y. GULUD-LEAF Window letters and script signs; no experience; 500% profit; samples free. Consolidated, 69-I West Van Buren, Chicago. . _ GET Our free sample case—Toilet articles, flavoring and specialties. Wonderfully _prof- patie. LaDerma Co., Dept. A, St. Louis, 0. AGENTS: Stamping names on pocket-key protectors. Sample check with your name and address, 25c. Stamping outfits. Emblem checks, check-fobs, name plates. Hart Mfg. o. Desk 2, 303 Degraw St., Brooklyn, MAKE Your own products. Employ agents yourself. Toilet articles, soap, extracts. We furnish everything. Valuable book free. Na- tional Scientific Laboratories, 1935 Broad, Richmond. Va. ““THAXLY Formulas produce perfect prod- ucts. All lines. Catalog free. B. axly Co., Washington, D. C. POLMET Polishing Cloth removes tarnish from metals without the use of liquid, paste or powder. Our agents say it sells like “hot cakes."” Retails 25c; sample free. Gale & Co., Ine., 15 Edinboro ‘St., Boston, Mass. 32 SEC XONDS Complete tire change by Detmer, Ohio, with Morey Quick Action Rim Tool. Sold, singly, 49 three days cleared $100. Anderson, Mont., sold 1,400 in 14 Get details for good territory. Har- vest time now. M. Morey Rim Tool, Buf- falo. N. Y. NO Matter what you are =e postal ad- dressed to Excello Sales Co., Shreveport, La., will bring best money making offer you ever receiv AGENTS—New shirt proposition. No capital or — = Commissions in advance. fre M Com- pany, 566 Broadway, "slow. “York. NTS Wanted—On a fast selling 25c item for the kitchen, costs you 8 1-3c. Sam- ple sent parcel post prepaid for 10 cents. P. Seed Filfer Mfg. Co., Inc., 353 Broad- way. New York. AUTOMOBILE Specialties. " Guaranteed formulas for all latest money makers. Low- est prices. Write for free lists. Murphy, Chemist, Tujunga, Calif. “FLAVORING _ Extracts—Bottle yourself! Concentrated. Free labels. 600% profits! Whirlwind moneymaking proposition! Write Thomas Manufacturing Company, Indian- apolis, Ind “MAN In each town to plate auto parts, reflectors, bathroom fixtures, refinish beds, mirrors, chandeliers; by new method. No capital or experience required. Simple plan of manufacturing at home starts you in big money-making business. Outfit furnished. Free particulars and proofs. Gun Metal Co.. Ave. H, Decatur, TH. ~REPLATE Brassy worn-off automobile parts, reflectors, bath room fixtures, worn spocns, forks, ete.. with pure silver. Looks like new. Use U-Kan-Plate Polish. Posi- tively no mercury. $1.00 half pints. Post paid. Satisfaction guaranteed. Agents wanted. Dept. A, U-Kan-Plate Co., Phila- ~A BUSINESS S Of your own—Making spark- ling glass name and number plates, check- erboards signs. Big beok and sample free. E. Palmer, 512, Wooster, Ohio. BRANDNEW 50c Specialty, 150% profit. Quick demonstration sells every housewife. Pocket sample. Deliver on spot. Great sideline. Agents, distributors cleaning up $65 to $124 weekly. Territory going fast. Write today sure. Harker Specialties ,Bat- tlecreek, Mich. $12.00 DAILY Showing new tabie cloth. Locks like linen. Wash like oilcloth. No laundering. You just take orders. We de- liver. Pay daily. Sample free. Bestever, 152 Irving Park Station, Chicago. $75 WEEKLY Up placing Aspirin, Notar- tar, Lighter Flints, Silk-Tone and other self- selling counter display cards with merchants, soda fountains, cigar stores, ete. Over 100% profit. Steady repeats. Sterling Company, F, Baltimore, Md. AGENTS — Clever Invention! Inkspoon makes every pen a fountain pen. Fast office seller; big profit, demand increasing Eco where. Exclusive territory offered. mple free. H. ——e Company, Tribune Ridge New York, N. Y. TWO Money makers for agents. ‘‘Fran- cia’ Pocket Adding Machine retails $4.85. To you $1.00. ‘‘Excellograph” Rotary Sten- cil Duplicator $37.50 retail. Write Type- aed Supply, 102 Hersch Bldg., Pittsburgh, "a “WE Start you without a dollar. Soaps, extracts, perfumes, toilet goods. Experience rane Carnation Co., 641, St. Louis, MO. MAKE Your own products. Employ agents yourself. Toilet articles, soap, =. We furnish everything. Valuable book free. N: tional Scientifie Laboratories, 1935 Broa Richmond, Va. ~ CALIFORNIA Perfumed beads selling like hot cakes. Agents coining money Big protts. ngs Sees. ——— Factory rE 2328 W. Pi Angeles, Calif BIG Profits? “Fast sales! $5. 75 auto- matic washing machine. Guaranteed. Write a Royalty Co., 3601 Enright, St. Louis, 0 $60-200 A WEEK. Genuine gold let- ters for store windows. Easily applied. Free samples. Liberal offer to_ general agents. Metallic Letter Co., 438-B North Clark. Chicago. HIGH GRADE SALESMEN WANTED ree printing ngs easy quic profits. Union label. Bigger commissions —up to 55%! Experience unnecessary. Now write orders with America’s most profitable printing stationery line. Thousands of free cuts. Over 150 standard items covering every business need: letterheads, noteheads, envelopes, billheads, business cards, state- ments, garage forms—shipping, battery, dry cleaning, tire, storage, parking and hat- cleaning tags; repair forms, blotters, gummed shipping, drug. advertising stickers, etc. Lowest prices. Steady repeat orders. Ship everywhere. New free outfit just off press. Write quick. Dept. 176, Box 498, Cincinnati, Ohio. “OUR Men actually earn $300 to $500 sell- ing our lines. Adelite, the newcomer in electric window salesmen, is making a big hit. More for the money. Business posters for every line. Changeable letter system too. Permanent business for you working with us. Territory protected and repeats credited. Fat commissions. Full details prove very interesting. Display Products, Ltd., 409-A East 31st St., Kansas City, Mo. “REPRESENT Leading manufacturers in your community. Big earnings. No experi- ence required. Get the facts about this unlimited field. Write for free copy of Opportunity Magazine, Address 750SA No. Michigan, Chicago. A SIDELINE That pays 410% advanced commissions. Biggest line ‘iMlustrated | print- ing for all businesses. No experience needed. Selling outfit free. Hillside, "217 Van Buren, Dent. 30, Chicago ~ EARN $20 A day. Establish Income for life selling for $1 a year, $1,500 accident policy. Write W. C. Stone, 11 So. LaSalle, Chicaea., POOL Shooter, new fascinating vending machine. Merchants everywhere buy! Splen- did sideline. Big profit maker! Free pocket outfit! Specialty Mfg. Co., W617 W. Divi- sion, Chicago. GALLOPING Ivories: New “game that’s thrilling all America. Absolutely legal. Every cigar counter waiting for you. $200 weekly. K&S, 4308 Ravens- wood, Chicago. $382.80 COMMISSION On a $10.50 orlg- inal sale. Every merchant a prospect. Ab- solutely new and different. Exclusive ter- ritory. Sales Stimulators, 339 W. Madi- son. Chicaro. SIDELINE To merchants. drug stores. ga- reves, Reneat business. Corona, Box One Sixty, Norfolk, Va. TAKING Country by storm. Odorles deodorant. Personal uses, Halitosis to toot odors. Household uses, refrigerators to toilets. Powder concentrate hundred times cheaper than any ready-mixed competitor. Amazing repeater. Save time. Send dollar for postpaid dollar bottle and dollar can. Satisfaction guaranteed. Exclusive terri- tory, long discounts, big volume profits, in Products, 2029A Bellevue, St. Louis, Mo. SALESMAN—Traveling, to sell new Da- Nite electric celluloid changeable lettter signs. Men earning $125.00 per week. Write at once for interesting proposition. Elwell a Co., 201 W. Carroll St., Macomb, STEADY Income to mechanically inclined salesman with car, selling guaranteed line socket wrenches and other time saving tools. Every mechanic live prospect. Liberal offer. York Co., Dept. PM212, 2640 Greenview, Chicago. ~~ BUCCESS Ts no accident! You will fully understand this slogan when you examine our automatic credit and collection plan. Copy- righted, brand new, unusual. 250% on original sale. Half cash on_repeats without callbacks. Commonwealth Publishing, 508 So. Dearborn, Chicago. BUSINESS Stationery—Largest __ line, highest quality, quickest delivery. Biggest commissions; liberal bonuses. Free copy- righted cuts every business. Experience un- necessary. Instructions and outfit free. David Lionel Press, 312 S. Hamilton, Dept. 114, Chicago. e+ HOW About this winter? Does your pres- ent connection offer you the money you want to earn this winter? We can show you how to earn $50 to $100.00 weekly. Are you interested? Write Geographical Pub. Co., 621 Plymouth Court, Chicago. aOL a: “PONT Sell for others—Employ agents yourself. Make your own products. Toilet articles, household specialties, ete. 500% profit. Valuable book "i National Scien- tifie Laboratories, 1935 Broad, Richmond Va MAKE Your own products. Employ agents yourself. Toilet articles, soap, extracts. We furnish everything. Valuable book free. Na- tional Scientific Laboratories, 1935 Broad, Rich 4. Vo. PAYING Position open. I'll put you in the shoe and hosiery business. Permanent income, protected territory, full commission on repeats. Experience not necessary. Hand- some sample outfit, literature—everything you need to become a successful shoe mer- Send for free booklet ‘Getting Ahead.” Wm. J. Mishel, Tanners Shoe Mfg. Co., M, 20012 C St.. Boston, Mass. OUR proposition is interesting. What and where have you heen selling. Neverbreak Tools, Box 304, North Canton, Ohio. ‘OOL Salesmen—Now selling auto itme- chanics, garages and service stations, to sell modern brake tester reccommended by lead- ing automobile manufacturers. Give expe- rience, lines now selling, territory covered, etc. The Kelley & Stewart Co., So. Browns- ville, Pa. “BELL “Union Label” business stationery Lowest prices, 72-hour delivery. Big com- missions advanced. Amazing bonus. (Cuts furnished for every business. Experience unnecessary. Outfit free. Northwestern, 2002 Division, Chicago. ~SALESMEN—Don’t miss this one: sell “‘Suredge,”’ the only low-priced guaranteed automatic razor blade sharpener, honing and stropping all blades in ten seconds. 100% commission. Wonderful demonstrator. Real fast seller. Suredge, 15 East 40th St., Dept. G,. New York. $2.95 AUTO Seat covers; pay daily; sales outfit free. Standard, 1938 Godfrey, Phila- dephia. as = ~KLEEN-FOOT Balm cleans the feet of minor troubles everyone has. Free trial. If it cures, sell! 807 Mather Bldg., Wash- ington, D. C. —PUNCHBOARD Salesmen. $10,000 yearly. New line. A!l fast sellers. Lowest prices Full commission on repeat business. free. Hurry! Puritan Novelty Co., 1409 Jackson, Chicago. au AMAZING rew-holding screw driver! Factories, garages, workers buy on sight! Profit 75e each. Exclusive territory. Free trial offer. Jiffy, 1273 Winthrop Bldg., Boston. —PUNCHBOARD Salesman. New deal. $25 daily profit. Great assortment. No selling. Repeats. oe outfit. Manager, 4330 G. Harrison, Chicago. —RUSINESS Stationery — Largest Tine, commission pas daily Sells all merchant« Pocket outfit free. Willens Co., Dept. 269, 2130 Gladys Ave., Chicago.

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’ a 74 POPULAR MECHANICS ADVERTISING SECTION SEVERAL, Active, honest, clean-cut sales- men wanted at once. Well known Detroit manufacturer of the nationally known Sto- ver’s Athletic Oil, used and endorsed by Howard Ehmke, world series hero; Sammy Mandell, world’s lightweight champ, and most all other major league athletes and champs, has special and alluring proposition to make to men calling on retail trade. . Your territory may be open. Write today. Stovers, Inc., 7523 Fenkell, Detroit. PU INCHBOARD Salesman—Most gigantic line ever featured. Vending machines, all kinds. Make high as $28.00 on single or- der. Repeat commissions. Beautiful colored catalog free. Lion Mfg., Dept. 8, 308 W. Erie, Chicago. $18 TO $25 Daily; biggest selling line of 2-piece ~ Ry $9.95 and $12.50; 3-piece wool suit, $17.95 (regular $28.00 value). All-wool overcoats $18.50. Splendid rain- coats, slickers and boys’ suits. Biggest com- mission. Free outfits. ‘‘Jim’’ Foster, Inc., Dept. 212, 2250 S. Spaulding Ave., Chi- cago, Til. WHILE Others talk, our salesmen ac- tually clean up. $8.50 commission on ten- minute sale at $18.50. Original Edectric Hot Dog Machine. Write for available ter- tory. Leonard E. Dickerson, Manufac- turer, Dept. E-19, Springfield, Mo. FREE Booklet describes 67 plans for making $20-$100 weekly in home or office business of your own. Elite Co., 84 Eliza- beth St., New York. PUNCHBOARDS—Hottest, largest money- making line ever offered. Season starting. Best commissions. Nothing to carry. Cat- alog free. Act! M&L Sales, 301 W. Adams, , Chicago, __ ~ WONDERFL JL Invention.” Seals fifty en- velopes minute. Sells on sight at $2.25. Attractive trial offer. Square deal. Bank references. Kendall Sealer Co., 440 San- some St., San Francisco, Dept. 14. MANUFACTURER Wants distributor for 300-mile $2.00 ‘‘Pocket’’ radio. “Sells itself with music.’ Pays 100%. Spencer Radio, Dept. 10, Akron, Ohio. ~ CASH Paid for Butterflies, Insects. See finclair Display Advertisement on page 26. BOYS, Girls, make some extra spending money during your spare time. No experi- ence necessary. Albert E. Pickett & Co., 3019 Diversey Ave., Chicago, Ill. $250 TO $400 Monthly for salesmen. Our goods sell quickly to factories, hotels, ga- rages, public institutions, etc. Large profits. Year around repeat business. Exclusive ter- ritory. Free samples. Vasco Products, El- mira, N. Y. BIG Wages in Canada, construction work, all trades! Write for list of positions, stamp appreciated. A. Allard, 4724 Des Erables, Montreal, Can. Se nnn ESI UeIEENEREEE REID EERE Pepeneneneeeeeneme eee EDUCATIONAL AND INSTRUCTION $50,000 PICTURE Man Friedman made canvassing. Beginners can make $100.00 weekly with my sales talk. Experienced men make more. Free book ‘Profits in Portraits” explains. Sample free. Picture Man Friedman, Dept. 8, 109 West Austin, Chicago. “ELECTRICAL Tool Tine selling to garages, mechanics and auto owners, wonderful dem- onstrators, big commissions. Salesmen, write Barker Specialties, Girard, Penna. “~SALESMEN—America’s leading collection service wants you to help doctors, mer- chants collect their bad accounts. You list them; we collect. Hustlers actually make $75-$100 weekly. Pleasant work, increasing profits. Get the ate Arrow Service, 29 Jay St., i A N.Y. SALES) your busi BECOME Your home town leading busi- ness man. Sell full line of groceries, motor oils, paints. Everybody a customer. No capital or experience necessary. Selling outfit free. Write Loverin & Browne, 1602M So. State, Chicago. FURNACE Carburetor for any heating fur- nace or boiler. Eliminate 80 per cent of smoke and soot. Reduces coal bill one fourth. Easily installed and operated. We offer you a permanent business with a big profit. Give sales experience, reference and territory covered, when answering. National Engineering Company, Lancaster, Pa. PUNCHBOARD Salesmen—$200 weekly. New deal. Biggest commissions. Repeats, liberal cash bonus besides. New catalog. Write Superfine Sales KF-531 So. Franklin, Chicago. ZINGOIL, The new petroleum oil hand- cleaner, outsells two to one any other cleaner on the market; replacing ordinary hand soaps wherever shown; if you can’t build up a business worth $100 weekly with Zing- oil, quit calling yourself a salesman. B. C. Carter Co., 6647 Foothill Bvid., Oakland, a BRUSH Salesmen attention! We pay highest commission, furnish your gift brushes free, give larger (restricted) territory, pro- mote you quickly. Prices reasonable, qual- ity line more complete, nationally known, tested, approved Good Housekeeping. Act now, company expanding. Donald Brush Co., Camden, N. J. SPARE Time work for young men selling the super automatic oil heater (for resi- dences) to the trade. Generous commissions on all wholesale sales. Write the Super Oil Heater Sales Company, 275 Connecticut Boulevard, Hartford, Conn. SRALL Salesmen—Make $20 daily selling new $3.50 improved coveralls, also service coats with customers name embroi- dered on back. Unusual construction. Com- mission 75c! Wonderful advertising value. Lowest priced; highest commission. Free outfit. Am. B. Co., AS-418 S. Wells, Chi- cago. AMAZING Auto oil gauge wiper. Sell garages by the gross as well as car owners. Particulars with sample 10c, refunded. George Koch Sons, 2112 Pennsylvania St., Evansville, Ind. BURGLAR Locks—For residence windows and doors. Locks them closed or partly open for ventilation. District — manager of salesmen for each city. 66% commission should run $4,000 to $18,000 per year. Tur- ney Mfg. Co., Sales Dept., McGee St., Kansas City, Mo. $1,500 POLICY For $1.00 a year. Big profits. Easiest, fastest selling proposition ever offered. United States Registry, Desk 10, Townsend and Superior Sts., Chicago. _ SALESMEN, Dealers, service men inves- tigate this new radio device. First time advertised. Doubles volume and distance. Can demonstrate coast to coast in summer. Brings in stations never heard on set before. Territories to producers. Write W. H. Laf- ferty, Sales Mgr., 279 Richton Ave., De- troit, Mich. SELL Goodyear raincoats; | $2.95 up. Good- year Rainwear, 682 Sixth Ave., New York. 3 experience unnecessary, sell” Oe our $10, 000 ‘Accidental Death; $50 Ac- cident; $25 Sick Weekly Benefits—$10.00 yearly. Other amounts proportionate. Guar- anteed steady income from renewals. $250,000 deposited Insurance Department, Universal a Dept. A, 40 Clinton St., Newark, MAIN Or sideline. Sell auto tires and auto accessories to tire stores, garages, etc. Protected territory, liberal commission. Economy Rubber Products Co., 604 Burk- hardt Ave., Dayton, Ohio. NEW Invention—Sell every business. Four $15 sales daily pay $288 weekly. Walker made $165 first day. Exclusive territory. Adiustment Service, Dept. PM, Mobile, Ala. WANTED District managers—Capable men to represent us in prosperous terri- tories with direct home office contract. Our organization is the oldest of its kind in the health and accident business and offer excep- tionally remunerative compensation. Write today for information. Dept. 18, Inter-State Business Men’s Accident Association, Brown Bidg., Des Moines, Iowa. ~ GOLD-LEAF Window letters and script signs; no experience; 500% profit; samples free. Consolidated, 69-V West Van Buren, Chicago. SALESMEN—Four $15.00 sales to mer- chants net you $40.00 daily. Sayers Sys- tems, 2813 Sheffield, Chicago, Il. TO Market 3A garage door holders, simple automatic action, quickly installed, instantly attracts garage owners, builders, dealers. Write for exclusive territory proposition. Knowlson-Stevenson Co., 1118 Packard, Ann Arbor, Mich. PUNCHBOARD Salesmen make $200.00 weekly selling punchboards and vending ma- chines. Big — commissions. Beautiful 3-color catalog free. Best season now. Write today. Old reliable company, estab- lished 20 years. Lincoln Sales, 16 8. Wells, Chicago, Dept. D. $60-$200 A WEEK. Genuine gold letters for store windows. Easily applied. Free samples. Liberal offer to general agents. Pietaltie Letter Co., 438-A North Clark, nicago HELP WANTED NO Dull times selling food. People must eat. Federal distributors make. big money; many over $3,000 yearly. No capital or ex- perience needed; guaranteed sales; unsold goods may be returned. We furnish you with license, sample case and free samples for customers. Repeat orders sure; exclu- sive territory. Ask now! Federal Pure Food Co., C2307 Archer, Chicago. YOU Are wanted to resilver mirrors at home. Immense profits plating autoparts, tableware, etc. Write Sprinkle, Plater, 287, Marion, Ind. “TF You need $100, $500 or $1,000 to pay your bills, buy new clothes, furniture, etc., T’ll show you a new, easy way to make it as my local representative. No experience or capital required. Albert Mills, 3948 Mon- mouth. Cincinnati. Ohio. “OBTAIN Employment desired, anywhere. Learn how. Station K, New York. “quickly, Write Box 39-203, LEARN To figure twice as fast by study- ing Smith’s “‘Higher Arithmetic’ at home. Write for prospectus to F. A. Smith, 608 S. Dearborn St., Chicago. MAK Money—Raise canaries for us year round, we buy all. Free: Outfit, birds course. Send 10c for particulars Schmeisser’: Canary & Pet Plant, Dept. 21, 5 East North, Buffalo, N. Y. GOVERNMENT Jobs.” Become railway postal clerks. $1,900 to $2,700). City car- riers, postoffice clerks. ($1,700 to $2,300). General clerks, file clerks ($1,260 to $2,500). Men-women, 18 up. Steady work. Life positions. Paid vacation. Common educa- tion sufficient. 25 coached free. Particulars free. Write today sure. Franklin Institute, Dept. D3. Rochester, N. Y. COMMERCIAL “Art p good, new $1.00 lesson plan leads to success. Write. Inte- gral School of Commercial Art, Meirose Park, Ill. ~WMEN 18-3 ~ Railway postal clerks, $158.00-$225. 00 month. Steady. Examina- tions coming. Common education sufficient. Particulars free. Write immediately. Frank- lin Institute, Dept. D14, Rochester, N. Y. FIRE , Brakemen, baggagemen (white or colored, sleeping car, train porters (col- ored), $150-$250 monthly. Experience un- necessary. 810 Railway Bureau, East St. Louis, Ill. STUDY A scientific profession. Micro- biology. Bacteriology. Sanitation. Exten- sion-residential course. Diplomas, degrees granted. Urinalysis outfit-prospectus free. College of Microbiology, 23 State, Hammond, Ind. AMATEUR Cartoonists: Sell your car- toons. New market. Smith’s Service, PR- 1194, Wenatchee, Wash. ae PRIVATE School for boys and girls. Wilson Schools, Dayton, Ohio. ad DOUBLE Entry bookkeeping 60 hours with 8 keys; guaranteed. (Diplomas.) In- ternational Bookkeeping Inst., 8 Spring- field. Mo. DON’T Prepare for any civil service ex- amination without seeing our catalog. Free. Columbian Correspondence College, Wash- ington, D. BIG Demand for photopl+y talking pic- ture and magazine stories. ./e revise, de- velop and copyright. Sell -on commission, Established 1917. Booklet free. Universal Scenario Company, 406 Western and Santa Monica Blidg., Hollywood, Calif. LEARN Aircraft welding,. auto mechanics, electricity. a — Big pay. Big demand. Free catalog. Stevinson School, 20088 Stain, Kansas City, Mo. WANTED Immediately, men-women, 138- 55, qualify for permanent government posi- tions, $105-$250 month; no gov’t experience required; paid vacations; common education; many needed soon. vrite Ozment Inst., 101, St. Louis, Mo. BECOME A landscape architect. Un- crowded profession ; wonderful coesttanity keg money-making. casily mastered Earn while you learn. Est. 1916. Write for details. American Landscape School, 29 Plymouth Bidg., Des Moines. Iowa. U. 8S. GOVERNMENT Wants men, $1,700- $1,900 and up at start. Railway mail clerk examination coming. Let our expert (former government examiner) prepare you for this and also rural carrier, post office, customs, internal revenue, and other branches. Write today for free booklet. Dept. 8, Pat- terson School. Rochester. N. Y. VALUABLE Kinks for Machinists. 419 time-saving ideas on various phases of ma- chine shop work. Intensely practical. 287 illustrations. Just write for ‘Machinists’ inks’’ and pay postman $1.50 — postage when he delivers the book. ‘opular Me- chanics Press, Room 808, 200 E. Ontario St., Chicago. TYPEWRITERS AND SUPPLIES “SIMPLEX Typewriters $3-$8; Remingtons $12.00; catalog 5c. Demeo, 114 Ford S8t., Providence, R. I. Tv Ren ingt gral for i—— = 61 eo ~~

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08 1g- TYPEWRITERS—Factory rebuilt Royals, temingtons, Underwoods. New Royal, Kem- ington and Corona portables. New “‘Excello- graph” Rotary Stencil Duplicator $37.50. Catalog free. Pittsburgh Typewriter Sup- ply. Dept. 945, Pittsburgh, Penna. TYPEWRITERS, All standard makes. $10 up. Fully guaranteed. Free trial. Write for complete illustrated lists. Northwestern Typewriter Exchange, 121 N. Francisco Ave., Chicago. axe ee TYPEWRITERS—AlIl makes, fully guar- anteed. $15.00 and up. rite for catalog. M. & M. Typewriter Co., 180 W. Wash- ington St., Chicago. TYPEWRITERS. Radios, motorcycles, $1.98-$24.98. Knights, 1524 Locust, St. Louis, Mo. combs art YPEWRITERS—All_ makes, $6 to $29. Fully guaranteed. Dee Typewriter Exchange, Ada, Okla. ADDING MACHINES NEW $3.56 Automatic adding machine. Adds, subtracts, multiplies, absolutely accu- rate Capacity $999,999.99. Fully guar- anteed. 75,000 pleased users. Makes add- ing easy, positive, quick. Eliminates mis- takes. Saves time. Postpaid $3.50. Bas- sett Co., 1458-D, Hollywood Ave., Chicago. PRINTING, ENGRAVING AND MULTI- GRAPHING BIG Free printing line brings easy quick profits. Union label. igger commissions up to 55%! Experience unnecessary. Now write orders with America’s most profitable printing stationery line. Thousands of free cuts. Over 150 standard items covering every business need: letterheads, noteheads, envelopes, billheads, business cards, state- ments, garage forms—shipping, battery, dry cleaning, tire, storage. parking and hat- cleaning tags; repair forms; blotters, gummed shipping, drug. advertising stickers, ete. Lowest prices. Steady repeat orders. Ship everywhere. New free -outfit just off press. Write quick. Dept. 178, Box 498, Cincinnati, Ohio. PRINTING—Low prices, fine work. New price list and samples. Stationery, circu- lars, folders, booklets, catalogs, ruled forms. Sell direct, large or small orders. Large modern plant in small town, low operating cost Shenandoah Publishing House, Ince., Box 1140. Strasburg, Virginia. WE Print stationery, booklets, catalogs, circulars. Samples. Commercial Press, Ba- tavia, Ohio. 200 LETTERHEADS And 100 envelopes $1.00 200 letterheads, 8%x11, 150 envelopes $2.00. 250 cards $1.00. Hoosier Print Shop, Portiend. Ind. PRINTED Stationery for personal or business use. 200 note heads and 100 en- velopes only $1.75 postpaid. Satisfaction or money refunded. -Redfield Co., 515 Sedgwick Drive. Syracuse, N.Y. VRUITT Pays postage on all printing orders. Satisfied customers in every state. Free samples. Pruitt. Brookfield. Ill 5,000 3%x6 TINTED Enamel folders, $13.75; 5,000 elegant envelope slips, $5.00. All printing low prices. Samples. Good- print, Harrisonburg, Va. STATIONERY—1,000, $2.75; 5.000, $10. Samples. Vineent Mosher, 323 ten. New- ark, N. J. 1.000 BUSINESS Cards $2-75_ postpaid. Samples free. John Miller, Montgomery Ave.. Narbert Pa. 500 BUSINESS Cards $1.10, 500 Tetter- heads, envelopes $1.98. 2.000 6x9 circulars oi 0 postpaid. Wm. Sirdevan, Ravenna, hio. 500 BUSINESS Cards, $1.25 postpaid. Other printing reasonable. Attractive sam- ples free. Hanzer’s, 1039 8S. Cleveland, Phila.. Pa. 200 NOTE Sheets and 100 envelopes $1. Brown, Warsaw, N. C. PARTICULAR? “Neargravure”’—Specia) 500 8%x11 letterheads, 250 envelopes, $4.44 postnaid. Samples. Sollidays. Knox. Ind. QUALITY Printing on quality paper. Prices and samples. Burket Printing Com- pany, Roaring Spring, Pa. SPECIAL High grade business state- ments $1.95 thousand. Many bargains. Bat- tlefield Press, Gettysburg, Penna. Free battlefield souvenir. 1,000 6% ENVELOPES Printed $185. Free samples. Spors Printery, Lesueur Cen- ter. Minn. “00 HAMMERMILL Tetterheads or en- velopes $2.00. Patton Comtany, 534 Paxton, tock. Omaha, Nebr. 200 8% x11 HAMMERMILL Bond letter- heads, envelopes or business cards $1.00 costes. Race Printing Company, Hudson, POPULAR MECHANICS ADVERTISING SECTION CIRCULARS, 5,000—5%x8%—$11; 3%x6 —4-Page folders $14. Big plant, little prices. Garrison Press, Harrisonburg, Va. 1,000 Hammermill Letterheads or en~ velopes $3.25. Cards, statements; bill- heads, 5%x8% _letterhbeads, $2.50 cash de- livered. The B. & M. Press, “Printers Extraordinary,”’ Dawson, Okla. ~MULTIGRAPHING—High grade business letters. Two dollars fifty cents thousand. Commercial Printing Company, 7054 N Clark St., Chicago. SAMPLES Raised letter printing with spe- cial prices free. LaClyde Service, Westfield, Mass ° 2.00 1,000. » ADS, Noteheads, envelopes, cards, billheads, tags, postcards. 2 free. Coyle & Kimballs, Newport, N. Y. MULTIGRAPHING Business correspond- ence two dollars shousand. Hammermill letterheads, four dollars; inexpensive quality, three dollars. Miscellaneous pantie. May- era Corporation, Monmouth, Ill ~ QUALITY + Printing! Heasonabie Prices! Send for Free Standardized samples and prices. Folders. Circulars. Catalogs our specialty. Earnest Fantus, 525 South Dear- born, Chicago. 250 BOND Letterheads, Envelopes, Ss, Bill- heads, Cost, $1.35 each. Economic Press, Leonia, N. ~ GOOD Peinitag- reasonable prices, distinc- tive ideas. Stationery, circulars, blotters. Samples free. J. Wilford Price, Harleysville, Pa. —_—— PRINTING OUTFITS AND SUPPLIES PRINT Your own cards, stationery, cir- culars, advertising, etc. Junior press $5.90; job presses, $11; rotary, $149. Print for others; big profit. Easy rules furnished. Write for catalog presses, type, paper, etc. Kelsey Company, Q-11, Meriden, Conn. “PRINTING Outfits—Presses, type supplies. type novelties. Send stamp for catalog. Model Press, York. Penna. MAKE Your own printing device. Ti’s practical—different! Particulars, specharmas free. Grinstead Laboratories, Oswego, Kans. ~PREUSED Printing presses and supplies. Lists 2c stamp. Popular Bargains, Rich- land, GUMMED LABELS 1,000 PRINTED: Name, business, address 50c. JBS Company, Box 93, Holyoke, Mass. RUBBER STAMPS RUBBER Stamps! Name, address, two lines 25c; three lines 35c. DeLuxe Stamp Works. 2M. Auburn, Nebr. DUPLICATORS AND DEVICES YOU Can make 50 to 100 copies of a letter, notice, etc.. at_a cost of three cents on a Heyer Quality Duplicator. Wr.te for free trial offer. The Heyer Duplicator Co., 909 Jackson Bivd., Chicago. “EXCELLOGRAPH” Portable rotary sten- cil printing duplicators $39. Terms. De- scription, testimonials, printed x: free. Pittsburgh Typewriter Supply Co., Dept. 531. Pittsburgh. Pa. FOR THE HOME HEAT Regulator. Make one for your own furnace. Simple. effective. No bat- terics. Handy man can make for few dol- lars. Send $1.00 for blue prints. Gryce System, 2416 E. 43rd St., Minneapolis, Minn. ~EGG-TIMER With bell; makes soft. me- dium, hard-boiled eggs certain, $1. Lellep, z Box 388. San Francisco. CEDAR Chests only $11.65—‘‘Red-i-Kut”’ complete with rich copper trim—you as- semble and save half—send for pictures. owas Furniture Company, Guttenberg, owa Lowest lt, on parts and eegenerinn. Paul Steckel, Glendora, Calif. FOR MECHANICS ATTENTION—Home mechanics: We sell unusual cabinet hardware. chest trimmings, tea wagon wheels and casters. big line small hinges, locks, etc. Upholstering supplies electrical hardware, knocked down cedar chests, ete. Send ten cents stamps for cat- alog. Thurston Manual Training Supply Company, Jobbers and Manufacturers, Anoka, Minn A BIG Opportunity in 8-hour battery charging or 20 minute car washing Let me tell you how you can install equipment with practically no investment. Earn $150 to $300 monthly. Bargains in used outfits. Also a few reconditioned buffers. grinders, air compressors, paint sprays, are welders. Write feday. Ken Byrum, Box M-1295, Troy, Ohio. 75 FOR SMOKERS SMOKE Tampa cigars. 20 a hun prepaid. Hand made. Ideal Xmas gift. Try them once, smoke them always. Cun- ningham, Box 374, Tampa, Pia. AUTOMATIC Cigaret making machines. Rolls, glues 50 for 10 cents; — folder. Postpaid $2.50. For hom Automatic Cigaret Machine Works, o247- Si Broadway. Chicago. RAZORS AND BLADES NEW Automatic safety blade sharpener selling like wildfire. Makes old blades better than new. Improves new blades 100%. Prolongs the life of any blade indefinitely. Quickly pays for itself. Every shaver wants one. Sharpens all blades including Gillette, Durham Duplex, curved blades, ete. Simple. compact, easily operated, guaranteed. Agents get free goods bonus proposition. Sample post paid $1.00, all countries. Viking Blade Comnany, 1706 Sunset. Los Angeles, Calif. “BHARPEN Razor blades. Build a busi- ness for yourself. Make a dollar per hour with our machines. Easy, light work. Ideal proposition for elderly men. Fully equipped chines $175.00. Velvet Edger Mfg. Co., 5 West 59th Place, Los Angeles, Calif NEW Gillette type razor blades. 30 for $1.00. Every blade guaranteed. Superior Biade Co., Box 1516 Cincinnati, Ohio. 36 GILLETTE Style razor blades, 1 dol- lar prepaid. World’s best. Genuine Swedish steel. Handelskomp, Reliance, Landskrona, Sweden GILLETTE Razor blades _resharpened 100% keen, le each. Petter Wetterquist, Rockford. Il. RAZOR Blades sharpened; two-edge blades 3c, single blades 2c. Newman, 6402 Ellis Ave., Chicago, Ill. eh GUNS, FISHING TACKLE AND SPORT- ING GOODS SHOTGUNS: Single barrel $9.00; dou- ble, hammerless, $21.75. American manu- facture; money-back guarantee Free cata- log. Franklin Sporting Goods, Box 10, Ampere. N. J. ~ HUNTERS And trappers: 3 See and try the “‘Screw-Bug,”” a mechanical ferret for rout- ing rabbits, skunk and other burrowing ani- mals. Sold by mail, allowing five days’ trial with an absolute money-back guarantee Price $4.00 each, with order prepaid, or C. O. D. plus postage. Free circulars and tes- timonials. The Grabow Co., Dept. A, Frank- lin Square, L. L, New York. FIELD GLASSES USED Fieldglasses: $2 to $75. J. Alden Loring, Dept. J, O-we-go, N. Y. ARCHERY MAKE Your own archery equipment. We furnish complete line highest grade mate- rials and complete instructions for assembly. Can easily build highest quality outfit for fourth cost of complete outfits. Letter brings complete catalog and prices. Sidney Archery Co., Box M119. Sidney, Ohio. CIRCULAR Free—Yew bows and bow- staves. Arrows—Highest quality, tackle, reasonable prices. Harry Hobson, Lyons, Oreg. ANTIQUES, WAR RELICS AND INDIAN Goops GERMAN Iron cross $1.00; Bohemian medal of honor, 90c. List of medals 10¢c. Dare, 670 E. 42d, Brooklyn, N. ANTIQUES. Firearms, ‘swords, relics daggers. curios. Catalog free. Nagy, 8 South 18th. Philadelphia. FINANCIAL War relics. Collectors find rich material for den or office in our free list. Preatorius, 1629 Meyer Court, Chi- cago. ~FOR Sale, mounted heads ee, , antiques. Lee Henderson. Stanley, “SEND 5c For fine new tise ~Tndian relics, antique firearms. - & llis, Webster Groves. Mo “INDIAN Stone relies.” 32- page catalog 5¢ Grutzmacher, Mukwonago, 8. — mneeAs PRECIOUS AND SEMI- ECIOUS STONES TOPAZ. Finest quality, colorless or smoky. The birthstone for November. Buy your stones direct and save money. Some stones low as $10.00. Can supply any size wanted up to twenty carat. R. A. Garner, Box 188, Lancaster. Pa. ao AGATE Jewelry, polished stones. Cab'net specimens Opals, zircons others. Indian arrow points. Cutting mounting. E. Bireh, The Stone Man, Box 34, Salem, Oreg.

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free. aa & Co.,

PATENTS. Prompt pases service Write for information. Albert E. pisterich, Registered Patent Lawyer, 621% Ouray Bidg., Washington, D. C. “LANCASTER and Aliwine, 221 Ouray Bldg., Washington, D. C. ‘Originators of the Form Evidence of Conception.”” Be- fore disclosing your invention to anyone ona for blank form to be signed and wit- . Form and patent fal bul- Tetin free. PATENTS. Send sketch or model for advice. Free book: ‘“‘How to Obtain a Pat-

ent.”” Established thirty years. Highest references. Prompt service. Reasonable charges. Chandlee & Chandl 910 F St.,

Washington, D. C. ““INVENTOR’S Adviser with mechanical movements sent free. Labiner, Three Park- row, New York,

IF You have a good patent or pending patent for sale, write promptly, American Patents Corporation, Barrister Bldg., Wash- ington, D. C. SELL Your invention before patenting. Write for free particulars. W. T. Greene, 902 Barrister Bidg., Washington, D. C. ~ INVENTORS—Cash in on your invention now! Don’t delay the sale any longer! Send for a free copy of our specially pre- pared booklet, ‘‘Turn Your Patent Into Money,”’ today! It contains helpful infor- mation for all inventors. M. L. Rund, Classified =} a" Popular Me- chanics Magazine, 200 E. cago INVENTORS, Manufacturers. If you have a specialty of real merit suitable for national distribution write The Plomo Spe- cialty Mfg. Co., Cleveland, Ohio. WANTED—Article to manufacture and sell. All or some part of which must be consumed and thus be a repeater. Give full particulars and price. Address G. 0 Room 514, 1240 South Main Street, Los Angeles. “INVENTIONS Wanted—P ‘atented, unpat- ented. If you have an idea for sale, write Ilartley, Box 928. Bangor, Me = bs ~ own patents. Legal blanks, complete instructions $1. Cuttin Ss, Campbell. lif. . rears INVENTORS Universal - Educator — con- tains 900 mechanical movements: 50 per- petual motions. Tells how to obtain and sell patents. Suggests new ideas. Explains how to select your attorney and avoid patent a shen ee A ees St. .00 post pa r ieterich, 621 Ou ° Washington, D. C. a Bids. “MAKE Your ideas a reality: consult the Thomas Engineering Laboratories, 1900 Vine St., Cincinnati, PATENT Application blanks. 23 cer cents. Everything for inventors.

. Ontario St., Chi-

Correspondence invited. American Inventors Directory and + Institute, Benning. Washington, D. C. Ifred E. Glascock, Director.

WANT —- opportunity to back eng!i- neers with new ideas for the improvement of airplanes. If we feel your inventions are practical we will help you develop them. Alexander Aircraft Co., Dept. 6, Colorado Springs, Colo.

INV “How Inventi inventi improv value pense new ¢ tem ventor

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POPULAR INVENTIONS—Write for our free book “How to Obtain a Patent’ and Record of Invention Blank. Send model or sketch of invention for inspection and _ instructions free. Terms reasonable. See advertisements en pages 158 and 159. Victor J. Evans Co., 157 Ninth, Washington, D. C. ™TNVENTORS—Read marvelous history of American inventions—most impressive record in annals of human achievement. Beautiful 2 vol. set, over 1,034 pages and 500 illus- trations. Original price $10.00—a few sets left will be sold at $5.00. Pay postman when delivered or, if outside U. 8S., remit when ordering. Popular Mechanics Press, Room 809, 200 E. Ontario St., Chicago. “INVENTORS Notice—Your invention or improvement can be sold, or its commercial value can be determined, without the ex- pense of first getting a patent, by using our new copyrighted Inventors’ Protection Sys- tem. Write for full free particulars. In- ventors Protection Bureau, A2032 Estes Ave., Chicago, Ill. WANED, All lines—household, automo- bile accessories, farmer requirements, novel ines. Particulars. Patent Supplies, Box { ‘Johannesburg, Africa. ELL Patents. Established In 1900. A nationally-known service. Experienced, respected. Why take chances? Charles A. eott, T73PM Garson Ave., Rochester, N. Y. ATENT Wanted—To buy outright patent on articles using hard wood as principal stock, maple, birch, beech, etc. Articles must be made from six foot stock. Chas. E. SUE Derby Line, Vt. ATENTS Sold, modeis built, sales cam- aoe prepared. Prospects furnished. Write Leroy Brown, 2519 Barclay, Baltimore, Md. TIME Counts in applying for patents. See pages 156 and 157. Clarence A. O’Brien, -—— Patent Attorney, Washington, ¢ “LACEY'S Patent Sense. nse. Valuable book free, See ‘ad page 161. PATENTS FOR SALE OUTRIGHT—Electrie flat tire indicator. Patent pending. Write G. Frederick, 6557 ” N. W., Seattle, Wash. YOR Sale—Patent pending. Outright, rovalty, adjustable sweep stock plow heel; ad ust in one minute. . Farmers wild. Sim- ple. Benj. P. Best, Ogeechee, Ga. SCRAPER. 28,036; Sept. 10, 1929- Troley, 1,729.92 4, Oct. 1, 1929. John rs zowich, 1404 Eddy 8St., San Francisco, alif. ~ OUTRIGHT Or foyalty, night bird-cage enclosure. Closes automatically. Phil. J Adamowiez, 2140 W. 21st Place, Chicago. KITE String reel—Wire. low cost, flat. Puente pending. Root, 476 Dartmouth, Buf- alo, 5 . UNITED States and Canadian patent on new loud speaker. L. A. Smith, 2821 Clara St.. New Orleans, La. ADVERTISING Improved reflector sign. shines days by sunlight, nights by electric livht, at low cost. Outright or royalty Schauder, 9324 Farragut Rd, Brooklyn. ~ REAR Glare eliminator—For automobiles, for any make automobile (mechanism con- cealed). Controlled by driver by single movement of finger (action instantaneous). Ornamental and truly a safety device for nieht Pw Will sell or consider roy- alty. B ‘ood, Winchester, N. H. FOR Sale—A figure toy of quadruped type with traction movement. Patent pending. Jovevh Heleniak, 661 Oklahoma Ave., Mile Waukee, . Wis, OUTRIGHT Or royalty. Patented brake drum cooling for automobile. Guarantee keen brakes from overheating; every auto- Per hile needs it, Peter Lasco, Forest City, Per na. ROYALTY Or cash, patent pending; adaptor fits all radio tubes; dozens uses, unlimited possibilities. Have others. Cash | royalty. H. Pack, Box 1183, San Fran- else. FOR Sale—Mechanical base-ball game with candy-vending machine. Manufacturers write and give me estimates for manufac- turing same. R. J. Thomas, 2209 W. Main St., Kalamazoo, fich. MECHANICS ADVERTISING SECTION WILL fell patent. Something new for hotels, restaurants and homes. Inexpen- sive. George Uhlig, Rochester, Mich. _ PATENTED Clinker tongs. Cash or roy- alty. Gust Carlson, 331 McPherson, Ot- tumwa, Towa. eh tale PATENT On small stamping good or clock. Entirely new, cheap to manufacture. market. Guyot, 443 8S. Virgil Ave., Los Angeles, Calif. — oe INVENTIONS To order. Submit prob- lem for estimate. Dudley Bunn, Savanna, Okla. ~ PARTNER Or purchaser—Patentable steam shovel, gas saver, refrigeration, tire, boiler and others. Garic, Lock Box 722, New Orleans, La. SiNGLe Sleeve valve motor. construction (no camshaft) 50% opening than other motors. Less weight per horsepower. Cash,-royalties. F. Dauen- hauer, Dutton Ave., Santa Rosa, Calif. OUTRIGHT Good will and trade mark “Vital” registered, a fortune word or brand for some manufacturer. Dr. Keller, Wi- baux, Mont. Simple greater valve 77 ELECTRICAL _.FILTER Condensers, test voltage, imfd, 750 $1.50; 2,000 $2.50; 2,500 $3.25; 4,000 $8.00. 2mfd, 1,000 $2.50; 2,000 $4.00; 4.000 ~~ pre Aluminum, square-foot 85c. Lead 85e. ‘“‘Ham-List’’ 4c. Curtis Sales Com- pany, 1109 Eighth Ave., Forth Worth, Tex, ~~ HANDY Electrical kinks on all phases of practical electricity. 47 ideas on wiring, 45 on making electrical devices, 19 on light- ing, 5 on transformers, 5 on motors, 8 on generators, 11 on switches, 22 on testing, 12 on repairirg, 11 on battery manufacture and repair, 5 on telephones, and 9 on ele- tricians’ tools. 214 articles, 162 pictures. Send no money. Just write postal for “Electrical Kinks.” Pay postman $1.50 and postage. Popular Mechanics Press, Room 808, 200 E. Ontario St., Chicago, LiL MODELS AND MODEL SUPPLIES *RODUCERS Of results. echanical an: consulting engineers. Our specialty models in metal designing, developing, building special machinery, manufacturing, experi- mental work, patterns, castings and model PATENT For sale. Something new. Cart- ridge and magazine holder. For sporting and military purpose. Stamp sheet metal, cheap to manufacture. Chas. J. Cook, 3908 Michigan Ave., Detroit, Mich. OUTRIGHT. New improvement for air- planes. 8. Wiechacz, 3520 Trombly St., Detroit, Mich. Mette ts “FOR Sale or royalty money making patent on fountain pen. Chrystal McCue, Goodell, Mich. OUTRIGHT Or royalty. Latest” grocery fixtures. Patented. Nelson T. Sharo, 32 8S. Bellevue, Memphis, Tenn. rates. Inventors see or write us. 25 years in this work. Dept. F. The Johns Engineering Co., 1380 E. 17th St., Cleveland, Ohio. SCALE Model railroad supplies—not toys. For hobbies or railroad exhibition work. The first and only complete model railroad catalog in the country—35c with credit slip. Well illustrated, parts for five gauges. American Model Railway Company, New Rochelle, N. ““FIME “Counts = popizing = patents. See pages 156 and 157. Cla rien. aes Patent Avene. Washington, FOR Sale—New style weather strip, for bottom of fire door, garage or house door, swinging or sliding. Can be put on with- out removing doors, A. Lundeen, Lyn- brook, N. Y. NEW Sensation. Kickless scooter. Patent pending. Jos. B. Iams, 929 So. Grant, Ta- coma, Wash —OUTRIGHT—Simple mechanical dandelion remover, destroys plant permanently with one pull. Louis Mauch, 846 Corona 8&t., Denver, Colo. WIND-STORM Hat retainer. Every man a prospect. Louis Pichler, 670 E. 102d, Cleveland, Ohio. OUTRIGHT Or royalty. U. 8. patent 1,724,767, ae soem. 1929: automatic — water heate R. A. Mercer, 6605 N. 13th 8t., Philadelphia, Pa. oA For sale. Sanitary, self- cleaning cuspidor. Useful on boats, street cars, railroad buildings, ete. Blue prints on request. Frank Seder, Box 1171, Jerome, Ariz. U. 8. PATENT For sale outright in clining dives for cream separator. Far superior to any now in use. Carl Molstad, Newfolden, Minn. ~ ROYALTY Cap and jar for preserves, jelly, jam, etc. very practical and eco- Patent pending. 8S. Thompson, St. James, Minn. OUTRIGHT New cream cone filler. ich. OUTRIGHT Or royalty—Butter dispensing device for homes, restaurants, hotels, etc. Serves butter direct to guest’s plate. Offers wide distribution for responsible organiza- tion. Thomas Kaskouras, 8244 Paxton Ave., Chicago, Til. aT RECENTLY Patented automat‘e flushing valve, also have a combination water and air machines. Fred Benske, 1422 Stebbins Ave., New Yo TIME Counts in applying for patents. See pages 156 and 157. Clarence A. O’Brien, Registered Patent Attorney, Washington, D.C. improvement in ice Wayne Like, Plainwell, ~ COMBINATION Motor truck, concrete and mortar mixer; establishing a new mixing principle and will prove a_ big money maker to manufacturer. Chas. Payne, 27 Fulton Ave.. Waukegan. Tll., U. 8. A. OUTRIGHT Or royalty—Patented kerless automatic door lock. Jay Westcott, 103 Wil- more Pl., Syracuse, N. Y. “ELLIGRAMS” —Protected ideas for go- ing ecncerns. Copywritten, health residence (sectional); patent pending. Perfected self- contained fool-proof, stabilizing, banking; tontrol all flying machines. Mctor-compell- ing, I‘felike movements, any extinct animal, or toy. All on royalty basis. Be able to put it over completely or don’t write. J. Ellinger, 645 Henry Bldg., Seattle, Wash. INVENTORS—Cash in on your invention now! Don’t delay the sale any longer! Send for a free copy of our specially pre- pared booklet, “Turn Your Patent Into Money,” today! It contains helpful infor- mation for all inventors. M. L. Rund, Mer. Classified Advertising, Popular Me- chanics Magazine, 200 E. Ontario St., Chi- cago, Ill “POWER Models for modelmakers. Steam and gasoline engines, boilers. Ship, rail- way and steam fittings. Modelmakers sup- ory metals. Catalog 20c Chas. Cole, Church St., Ventura, Calif. — or ani Bi Model Fittings: Send Dime for booklet. A. J. Fisher, 1002 Etowah Ave., Royal Oak, Mich. ~ LET Our experience be your guide. Mod- els that are models; tools and equipment for economic manfg. Patterns of all types; manufacturing in all branches. Satisfaction guaranteed. z wy Machinery Company, Cin- cinnati. “MODEL | Bisa 1 locomotives, castings, ma- terials. Catalog 15c. Birch, 131 Elza _Avenue, Hazel Park, Mich. “WORK With master machinist; 15 years experimental experience, well cauipped shop Albert Weiss, 161 W. 2ist St. ew York City. THE Modelmaker, @ magazine for all in- terested in making working models, boats, etc. Sample 10c. Modelmaker, 122 Lib- erty St., New York. Bs" WE Make working modeis for inventors and do experimental work and carry a com- plete stock of brass gears and model sup- plies. Send for catalog. The Pierce Model Works, Tinley Park. Ill. : ae “SPECIAL Machine builders, tool and die makers, inventors’ models production work of all kinds. Dept. L. Quality Hardware & Machine Corporation, Ravenswood and Thorndale Aves., Chicago, Til. MODEL Steam engines and b0Ylers for miniature power boats. Boat and _ boiler fittings. New catalog lic. Model Machine Shop, 212 Price St., Rahway, N. J. MANUFACTURING LARGE Factory exceptionally well equipped to manufacture your product complete, ware- house it and ship to your instructions. Dies, stampings, casting, screw machine, wire products, plating, enameling, assembling, eartons and printing. Quantity production. Estimates promptly furnished. A_ reliable and efficient organization. Maiestic Prod- ucts Mfg. Company, Box 877, Chicago. LOW Cost manufacturing. Large plant completely equipped for blanking, drawing, stamping and wire forming in any finish. Can save you money on your product. Our figures will convince. Eastern States Prod- ucts, Box 721, New Haven, Conn. MANU FACTURING Models, dies, stamp- ings, brass_work, one or thousands. Cir- cular free. Baum’s Metal Specialties, Kansas i Mo. *ECIAL Machinery or parts, dies, tools, metal specialties, models, special gears, stock gears and model supplies. Send for Catalogue. The Pierce Model Works, Tin- ley Park, Til WIRE Goods made to order. Cooley Mfg. Co. 530 N. Western Ave., Chicago. ‘SPECTAL' TY Manatectustog: Stampings, wire products, patents developed and mar- keted. Safety Globe & Mfg. Co., Colum- bus, Ohio.

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—— een ge pte 78 POPULAR MECHANICS ADVERTISING SECTION DIES, Stampings. A. Frye, Box 12, Sta- tion A, Elizabeth, N. J. fe a core anufacturing, Stampings, springs. Iron, aluminum, brass, die castings. Pat- tern and die making. Allen Industries, Independence, Mo. DIES, Stampings, machine work. B. L. Nortwed, Mitchell, S. Dak. FOR MANUFACTURERS MANUFACTURERS Job lots bought for cash. What have you? Edward Ross Co., Westerly, R. I. HOME WORK SHOP GOOD Used band-saws, jig-saws, wood craftsman’s lathes, drills at special low prices. Waco Tool Works, 5212 West Kinzie 8t., Chicago. MACHINERY, TOOLS AND SUPPLIES Cc resses: Small power bench type. $65.00. Circular. Allen Industries, Inde- pendence, Mo. TIME Counts in applying for patents. See pages 156 and 157. Clarence A. O’Brien, oy neg Patent Attorney, Washington, REBUILT 3 Rg or gasoline engine, price right. J. Hildreth, New Kensing- ton, Pa. STEAM Engines—One h. p. $18.00; % $12.00. James Chambless, PR, * ala. NAVY Surplus, 800 new radio generators d.c. and 500 cycles. Unusual prices. List. od Kiengle, 501 East 84th St., New ork. WELDING AND SOLDERING START In highly profitable are welding business with practically no expense. Our constant are welder starts you on road to success. Easy monthly terms, liberal trial on money back guarantee. Write today. Hobart Industries, Box M-1298, Troy, Ohio. BENDING MACHINES USED Are welders, air compressors, buff- ers, grinders, reconditioned and guaranteed like new. Shipped on trial and easy terms. If you’re in need of good guaranteed equip- ment, write today to Bob Jones, Box M-1296, Troy, Ohio. NO. 3 CINCINNATI Universal Milling 4K with dividing heads, $550.00; 14 in. x 6 ft. Von Wyck lathe, $140.00; No. 60 Heald Grinder, $275.00; 20 in. Hendy Shap- er, $225.00; 24 in. Steptoe Back Geared Crank Shaper $550.00, 36 in. x 18 ft. Niles Lathe, $775.00; 20 in. Barnes Drill Press, complete, $65.00; Quincy Air Compressor with tank and hose, $65.00; 10 in. Bench Drill Press, $23.00. Terms to suit. Write for catalog. Cincinnati Machinery & Sup- py Co., 27 West Second S8t., Cincinnati, BENCHLATHES, Real working - da a — recision machines. 2 inch swing, 6 inch tween centers and above. Set of detailed blueprints and directions 50 cents, complete castings Dzubay, 609 Avery St., Pitts- burgh, THE Famous MHossfeld ‘‘Wrenchless’’ Universal Iron Bender is the last word in bending machines. Bends metal, cold or hot, into most any conceivable shape, in- cluding Eye Bolts and Automobile Spring Eyes. Bends up to 1” bars or 1%” pipe cold. Thousands in use by all classes of trade, from the smallest shops to the largest railway system. Write for circular and prices. Hossfeld Mfg. Co., Winona, Minn. LAND Sale, $5 down, $5 monthly, buys 40 acres Southern Missouri. Price $200, Send for list. Box 22N, Kirkwood, Mo. PECAN-Orange-Fig groves *‘On the Gulf.” Monthly payments. Guaranteed care. Big, quick returns. Suburban Orchards, Dept, M.. Biloxi, Miss. SELL Your property quickly for cash, no matter where located. Don’t pay big com- mission. Particulars free. Meal Estate Salesmen Co., Desk B, Lincoln, Nebr. ~“OZARKS—10 Acres near White river and proposed power dam, $100, $5 monthly. Alvin Zimmerman, 1802 N. 5th, Kansas City, Kan. REDUCE Labor on your farm and in- crease income. One farmer writes he would not part with the information for $100 if it could not be duplicated. Send today for our valvable ‘Farmers’ Handbook” and get ready to put some of the 861 practical ideas into operation for your own benefit. Pay postman only 98 cents plus postage when delivered. Popular Biehontes Press, * Room 808, 200 E. Ontario St., Chicago. MONEY Made in Mich. potatoes. $10 down now and easy terms buys land near — lakes, streams. Write today. Swi- & Co., P-601, 32 N. State St. Bidg., Chicago. iil. EASTERN Pennsylvania farms near Phil- adelphia, Write for bulletin giving prices, sizes and descriptions. Wilson George, Quakertown, Pa. SURVEYING INSTRUMENTS GUARANTEED _ Rebuilt levels. All makes. Sold on approval. - gain prices. Cash or easy terms. Wri today for descriptive list M-312. Westen Knight Company (Makers of ‘Sterling’ Transits and Levels), 136 N. 12th St., Phil- adelphia, Pa. COMPLETE a ia. outfit $25.00. Combination transit $45 Sent pre- paid for cash. Money —_ guarantee. Wissler, 639 No. Broadway, St. Louis, Mo. LUMBER transits and CONCRETE Building block — ent molds. Easy payments. Catalog free. Con- crete Machine Co., 5 North Main St., St. Louis, Mo. START Business of your own, small in- vestment required, doing nickel, copper and silver plating. This work in big demand. Information free. Electro Platers Supply Co., 28 W. Second St., Cincinnati, jo. NEW And used machinery and equipment. One of the largest stocks in the country. Lowest prices. Botwinik Brothers, Inc., 67 Water St., New Haven, Conn. —————$—_—$—$—_$—_—— ENGINES. MOTORS AND DYRABOS ARGAINS—Elec. drills, enc! saw outfit $7. 35; elec. bench grinders *s13. 20; combination lathe, $8.15; scroll saw, $5.60; motors, generators, james plant equipment; flexible shafts; 100 other bargains. Send for special bargain bulletin. Acme Tool Co., 627 W. Washington, Chicago. FOR Sale: One-sixth hp. elec. motors, 60 cycle, 110 volt, a.c. slightly used, first class running condition. $4.50 each. Cash with or- der. Also some % hp. gasoline engines with magneto fly wheel at $12.00 each and some electric motors not running at $1.50 each. Maytag-Chicago Co., 160 E. Illinois St., Chicago, Ill. NEW Idv. 5 Ampere battery charging gen- erators $6.50; a.c. 110v. % hp. motors, $7.50; % hp.. $16.50; 32y. motors, % hp., $19. 50; 1/3 hp., $12. 30; % hp., $8.50; 32v. motors with emery, buffer, drill chuck, $8.00. Large stock motors and generators. Queen Caty Electric, 1736 Grand Ave., Chicago. ES Phonograph motors with speed governor. Westinghouse dictaphone motors, both universal, $5.00 plus express 10 Ib. Geo. Schulz, Calumet, Mich. KNOW Your wood. 33 samples rare woods $2.00. 20 cabinet and 20 inlay $1.75, choice $1.00. Sets postpaid and labeled. Send _ for catalog. Craftsman Wood Service, L-717 East 62nd St., Chicago. FARM LANDS LAND Opening—The Great Northern Rail- way serves an agricultural empire in Minne- sota, North Dakota, Montana, Idaho, Wash- ington and Oregon. These states abound in opportunities for small farmers or large op- erators to rent or purchase a farm at lowest prices and best terms of many years. Every kind of farming, grain, livestock. dairying, fruit, poultry; large acreage or small sub- urban tracts, rich cutover or high producing irrigated land. Write for free Zone of Plenty book with detailed information. Low homeseekers’ rates: E. C. Leedy, Dept. 457, St. Paul, Minn. $900 GETS 78 Acres on asphalt, edge de- pot village; trout brook; 7 homelike rooms, -cow barn, silo. $2,900 with horses, 8 cattle, poultry, machinery, all crops; $900 down. Pg 47 big new catalog. Free. Strout Agency, 255-P Fourth Ave, New York City. WINTER Home in Florida.” Lots $1 down $1 a week. On Dixie Highway, close to Tampa. _Ask for prospectus. Box 374, Tampa, Fila. FL ORIDA “Real estate appraisers. 34 years’ experienc Know the real value of your land. leaseaahie fees. Cunningham Investment Co., Inc., Box 374, Tampa, Fia. TO Sell, trade or buy property any- where located. Write Fisher Realty Co., Hannibal, Mo. OZARKS—40 Acres, Missouri; ba! nent: own a home. Jarrell, Mt. Vernon, WHILE 100 Last: % horse alternating double shaft grinding and buffing motors with emery wheel, buff, cord and_ switch, $9.75. % horse motors, $7.00. 1-3 horse, $10.50. Also generator bargains. Electrical Surplus Company, Dept. 5, 1911 Chicago Ave., Chicago. OUR Governors will control any make of auto engine at any speed desired. Easy to install. $10 C. O. D. Candee-Smith Gov- ernor Co., 215 North Los Angeles &t., Los Angeles. COMPRESSORS, Twin cylinder, for small tire shops. Duco spraying. J. Trockman & Sons, Inc., 310-312 Lincoln Ave., Evans- ville, Ind. SAVE Money—Automatic air compressors, constant potential battery chargers, recon- ditioned and guaranteed like new. Unusual value—shipped on trial and easy terms. If ean use, better write today to D. W. Baker, Box M-1297, Troy, Ohio. WANTED: Hear from owner mavtmk “good farm for sale. Cash_ price, particulars. John Black, Chippewa Falls, Wis. FLORIDA—20 Acre tracts at De Funiak Springs, N. W. Florida. Biggest oppor- tunity of year. Where the sun shines the year around. Fine for poultry, grapes, fruits, garden or truck farms. On good roads. Good soil. Health-giving water. Perfect climate. Near schools and churches. Co-op. market plan assures comfortable steady income. Full price only $500. Pay $200 down. You get clear title deed at once, balance $18 a year; no interest. Specially arranged round trips by auto from Chicago. Great opportunity. Send for free copy Chamber Commerce book- let today. McCaskill Estates, 7 8S. Dear- born, Chicago. EIGHTY Acres oil mineral land, five dol- lars acre. Terms. Also irrigated grape- fruit and vegetable land. Business oppor- tunities. Wonderful subtropical Rio Grande Valley. Phillips, San Benito, Tex. ie AND PETS JT 4 hg houn al; literature free. Dixie, Alf, Herrick. IL “FOR Sale, my tra et ae eee buys him on 20 days’ trial. D49, D. D. Scott, Calhoun, Ga. SCOTTISH Terriers for Xmas. Good ones ready for delivery Nov. lst. 8S. Guss, Point Reyes, Calif. ST. BERNARD For Christmas giftT Rare, beautiful thoroughbred puppies. Photos submitted, delivery guaranteed. Helvetia — 181-P McKenna Ave., Montreal, ue. “FANCY Rats and mice. shine Mousery, Palmetto, FOR Sale. Minks, squirrels, raccoons, foxes, ferrets, muskrats, ginseng, rabbits, skunks, wolf pups, opossums. B. Tippman, Caledonia, Minn. SHEPHERDS, Collies, fox terriers shipped on approval. Ricketts Farm, Kincaid, Kans. WHITE Collies and other colors. Beau- tiful and useful. Dept. P, Shomont Ken- nels, Monticello, Iowa. DOG Lovers—Every fact regarding every phase of dog training (all breeds) includ- ing psychology, obedience, guarding, swim- ming, rescue work, hunting, herding flocks, teaching tricks, finding lost articles, rac- ing, war service, police dogs, sled dogs, . will be found in “Training the Dog,” by Will Judy. Price only $1.5 Pay _post- man when delivered or, if outside U. &., remit when ordering. Popular Mechanics Pregs, Room 809, 200 E. Ontario St., Chi- cago. 30 varieties. Sun- RABBITS RAISE Fur rabbits. We pay $4.00 for those raised from our stock. Send 10c for catalog, contract, etc. Goldenrod Fur Farms, Inc., Lincoln, Nebr. MAKE Big profits with Chinchilla rab- bits. Real moneymakers. Write for facts. $52 Conrad’s Ranch, Denver, Colo. MAKE Big profits—Chinchilla rabbits. New bonus plan assures big profits. t facts. T. Mueller, U. 8S. Nat’l Bank Bldg., Denver, Colo. RAISE LaSalle fur rabbits. Build big paying business. LaSalle Fur Co., Mt. Clemens, Mich. MUSKRATS Neen eee se ani aTEEEEETER TRAPPERS—'‘Eleven Box Traps. Com- plete blueprints, 30c. Weesho-Uco, 3lst Office, Detroit, Mich. —MUSKRAT Farming—The greatest book on one of the greatest opportunities today. Tells of the opportunity in this business and how to do everything in connection with the raising and marketing of muskrats. Pay postman only $2.25 and postage when deliv- ered or, outside U. 8., remit when order- ing. Popular Mechanics Press, Room 809, 200 E. Ontario St., Chicago. WANTED—MISCELLANEOUS crowns and bridges, watches, diamonds, silver, platinum. 1 G returned. if offer refused. United States Smelting Works “(The Old Reliable), Dept. 71, Chicago. WE Buy gold teeth. Southwest Gold & Silver Co., Box 68, Ft. Worth, Tex.

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buys $200. flo. ulf.* Big, Dept. l, no com- State and Alvin Kan. in- ould 0 if ' for and tical refit. tage ress, ° ones oint Rare, hotos vetia real, Sun- pons, bits, man, pped cans. seau- Ken-

every plud- le),

POPULAR MECHANICS ADVERTISING SECTION 79

WANTED—March 1928 copies of Pop- CHILBLAINS, Ingrowing nails or bun- NINE Foxes in one day is the record of war Mechanics Magazine. We pay ions, safe, natural, painless correction. Write | one man that used my methods. One set 25 each for all copies of this number de- your ailment for free information. Eugene takes fox, coon or skunk. Write for proof. livered to us in good neuen, oer Eaton, D106, Bandon, Ore E A. Estabrook, Pittsfield, Vt. Popular Mechanics Magazine, oom. » LETTERS Mailed from he “TPS You!” Se See ye : LE 7 } ere for 10c sil- ou: nsational song 25¢ r 200 East Ontario St., Chicago. ver. Foster Mailing Service, bre hy “s2nd, | copy. Over 60 waltzes, fox-trots, etc. Ex- —HIUNDREDS Of people have sent their | Chicago, Ml

traordinary low prices to jobbers, dealers,

old gold, silver, platinum jewelry, dental ~ — ~ - agents, music teachers, etc. Chester Escher, work to me. Why not mail yours today? 1OSALINE. What is it? Send for free Music Publisher, 125 West 45th St., New Highest prices paid. Satisfaction guaranteed sample. A soothing, comforting external York City or goods returned. F. Polcer, 2408 South application for simple head colds, muscular TTTOOTST —Learn how with my out- Cicero Ave., Cicero, Ill.

FOR SALE—MISCELLANEOUS

soreness from exposure and fatigue. Simple fits headache, neuralgia. For tired aching feet - and ail pains and aches. It is clean and FOR Sale—Remaining stock of Nuway ae The Iosaline Co., 630 M St. N.

Descriptive circulars sent anywhere. Sergt. Bonzey, 367 So. Main, Providence, a

’ “WATERTIGHT Wrist purse for swim- soap cup saver, manufactured by the Hi:l- A —- mers. -Keep "your valuables with you, 50c. wood Specialty Co., to retail at fifty cents. ARE You old at forty? See our advertise- | Lellep, Box 388, San Francisco. About 500 cups and mailing containers hand. Write for free sample, then offer on lot. Chas. E. Audinwood, Line, Vt.

“ADDRESSOGRAPHS, Letter folders, tigraphs, envelope sealers, duplicators, than half price. Guaranteed. Pruitt

on ment on page 162 of this issue. The Elee- FASCINATING Christmas gift. Brought make tro Thermal Company, 2124 Morris Derby Steubenville, Ohio. Ave., | from Holy Land. Christians thrilled. Spe- cial offer now. Write League, 815 Long-

i. TOBACCO Or snuff habit cured snl pay. $1.50 if cured. Remedy sent ‘on trial. CASH Paid for Butterflies, Insects. See less Co Superba Co., N3. Baltimore, Md or no

acre Bidg., New York City.

Sinclair Display Advertisement on page 26.

No. Wacker Drive. Chicago ADVICE, Information, any subject, 25¢ MAKE Money with magical cartoons. at TATCHMAKER s take ie <aleat a | coin. References. Fred Klotz. Reading, Pa. | Learned in one evening. eae 4 bargain. R. Jaegermann, 5815 Easton Ave., STOP Fingernail biting habit. Guaran- clubs and parties. endrickson’s na. St. Louis, Mo.

ROOTS AND HERBS teed cure $2.00. M. W. MelIntire, Wilming- Talks, Argyle. Wis. “ MEXICAN Made holsters, lariats, horse-

HERBS, Roots, barks, seeds. All 2e box Lists free. Botanics, 112th St., Chicago.

PERSONAL

LEARN To hypnotize. Instructive on hypnotism, 10c. Geo. Fenner, K Jef- book | Jished 1855 ton, N. C hair articles; rattlesnake belts. Send four cents for illustrated list. Tex-Mex Leather kinds, MISCELLANEOUS Co., 309 Esperson Bidg., Houston, Tex. West INDIAN Methods—World’s greatest trap- HOMEOPATHIC And Biochemic prepara- ping secrets exposed for first’ time Best tions sent postpaid to all parts of the world. ‘“‘weatherproof’’ Fox—Coyote—Mink sets on Manual and booklet free. Halsey Bros. Co., earth. Methods $1.00—worth hundreds. 5547 Ravenswood Ave., Chicago, Ill. Estab- Cecil Atkinson, 446-T. Mandan, _N. Dak.

cUutgs Aaebety can make Simple, cheap

ferson. Louisville, y. d. MIRRORS Resilvered at home. Costs near process, $1.2 Specimens, particulars. 2¢ TOBACCO Or cigarette habit In I cents per ane eos you charge Og stamp. M “Day. Windfall, Ind seien days. Guaranteed. Costs two dollars. mmense profits plating autoparts, reflectors a - —— Marvin Helle, 41 52 Gladwin, Detroit, "Mich. tableware, stoves, refinishing metalware, etc. CARTOONISTS Sell your drawings. —FOOT-PAINS! Ended with famous “Arch- Outfits furnished Details free Write Proven plan. Castle Studios, Independence, belt Send shoe size. Box 4, 178 Read, Dorchester, Mass lie postpaid. Relief guaranteed. - 78 Columbia COMMERCIL 4 | a og ing. Work done rea- TELL An army of 3,000,000 live readers Ave., ali about your offer! If you have anything Missouri

Sprinkle, Plater, 288, Marion, Ind. sonable. E. Hildreth, 2136 Clinton “FOOL Your friends!” Make them think | New York City. you are in New York. Send 25c 10 TIME Counts In applying for patents

to sell, buy or exchange, or if you have any See reasonable proposition, tell our readers all

New York postcards. I will mail them to pages 156 and 157. Clarence A. O’Brien, about it—they’ll respond quickly. Our book- your friends from here. Send any letter you Registered Patent Attorney, Washington, let ‘‘How to Create More Business’’ contains want mailed from here, with 10¢ for service. rc some very interesting, helpful facts Write Marvelous fun for practical jokers! Wol- OIL-PAINTING—Anyone can learn. Start | today for your copy—it’s free. M. L. Rund, green, Box 59, Whitestone, N. Y . studio, teach, demonstrate. © Inexnen<ive in- Manager Classified Advertising, Popular “YOUR Photo, 20, $1.00. Ceniidentiol, frente. Particulars free. Hughes, Box Mechanics Magazine, 200 E. Ontario S8t., Send photo. Pop~ Gpo, Box 471, New York, 1264, Los Angeles, Calif. Chicago, IIL

Now. You Can Weatherstrip Your

MADE OF REAL S-P-R-I-N-G BRONZ

AGENTS BIG MONEY! This great new develop- ment gives you an amazing chance to get into a business of your own. Up to $200 in a week is possible even in small cities. Even Spare Time may pay from $3 to $5 in an hour. Sales out- fit furnished. Mail coupon for territory.

Own Home at’s the Cost! This short message contains facts of almost startling significance to both home owners and renters. Read them and then use the coupon below for detailed proof including generous free sample. INVENTOR’S DISCOVERY BANISHES ALL OLD-STYLE EXPENSIVE METHODS O more costly “make-shifts’’! No more inefficient zinc, rub- ber, felt or composition “‘strips’’! Now a new-type material used to weather-proof the great city sky- scrapers is available to householders in a newform. The mechanical wizardry of a St. Louis genius brings this super- insulating material to you ready to use right in your home. If you can handle a yardstick and a pair of scissors you can now weatherstrip every door and window in your home in just a few minutes. Cuts Fuel Bills in Half... Ends Drafts This new weatherstrip is guaranteed to pay for itself in fuel savings alone in less RED-D-PLY MANUFACTURING CO., W-10, __Dept. : 1531 Washington Avenue, St. Louis, Mo. than two years otherwise it doesn't cost you one penny. It Dantahes drafts ends “colds” and doctor bills. Keeps out all ine soot, dust and dirt that now sifts in around doors and windows. Curtains, rugs, drapes, clothing stay clean twice as long. For advertising purposes a sample of this revolutionary new weatherstrip is being sent to interested people. With it are included the many astonishing details that there is naturally not room to print in this limited space. Get the facts along with our ae introductory offer. Mail the coupon at once iid oY Red-D-Piy Mfg. Co., Dept. W-10, 1531 Washington Ave., St. Louis, Mo Without obligation to me, rush sample of weatherstrip invention, also low-cost in- troductory offer.

Tow State {5 Put check mark here if you want to make money as our agent.

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2 a a EAL SF de Sr ay wea Ph Psi Rae ne ae 80 POPULAR MECHANICS ADVERTISING SECTION 20 Years of Shirt Sleeve Practice In ELECTRICITY The Croft Library of Practical Electricity HIS is the electrical age, with unlimited JUST opportunities for the man who has educated himself in the finer points of OUT! electrical practice. 2 Fit yourself for a big-pay job by knowing electrical practice complete, including in- Newly Re- vised Edition side and outside work, central stations, and the whole subject. With the aid of the ‘Croft books you can know electricity as experts know it and put yourself in line for an expert’s pay. Standard Electrical Training The Croft Library is a complete electrical educator. It is founded on practice—on work as it is actually done. It is jammed from cover to cover with the kind of hard-headed facts pe a Written so that the beginner can easily understand it, yet sc 80 thorough, that it is the daily guide of 59,000 highly 4 clerical workers and engineers. Croft tells you the things you know about motors, generators, a pane el circuits, rmatures, commutators, ~~ switehboards, distribution fystems—eiectrical of every ty wiring for t an wer—wiring o fnished ed bull dings —-~gnderwriters and a requirements— illumination 7 its every phase—the latest and most improved methods of lighting — lamps and lighting effects, etc.—how to do a complete job, from estimating it, to completion. Make no mistake ee it—there are big jobs in Goctrietty send for you Me you're ready for them. Thousands of men who have we = t aeeery know at to be a fact. The Library itself, on a ASIS, will prove it to your own absolute satis- fnetion. 3000 Pages, 2100 Illustrations In these volumes Croft teaches you electrical practice complete He takes you in quick, easy steps from the simplest princip the an operation of a great central station He tells you all that he has te in twenty years of shirt-sleeve is. ith these books at his elbow a man can learn as much about electricity 1 in six months—good practical ‘bread and butter’’ stuff— as he would ordinarily learn in a lifetime of practice. NO MONEY DOWN SMALL MONTHLY PAYMENTS Fill in and mail the pom m attached and we will send ou the entire set of eight volumes for ten days’ Free cxamination. We take all the risk—pay all charges. You assume no obligation—you pay nothing unless you decide to keep the books. Then $1.50 in ten days and the balance at the rate of $2.00 a month. Send the coupon NOW and see the books for yourself. FREE EXAMINATION COUPON McGraw-Hill Book Co., Inc., 370 Seventh Ave., New York Send me for 10 days’ free examination the Croft Library of Practical Electricity. If satisfactory I will send you $1.50 in 10 days and $2.00 monthly until the special price of $19.50 is paid. If not wanted, I will return the at your expense. (70 insure prompt shipment write plainly and fill in all lines.) NMS. oc vccorccccccccecs ee rercceces ee ererececceeccceees . POND. 5a vvcesveccedsccecovceogec eeeccccccceces evccecce City and Slate... ..cccee Coccccercces ececepecoces Coeccesse SN 66 6 tbbd EN CbddersCecéEsceRd ese nenecesenesonelle ° Ne EEG+0n60ens.cbe ccctaneeenstt.astee P, M. 12-29 Al for *529 Why pay an extravagant price for strength—here’s an opportunity to get l the equipment you require along with an excellent course of instructions Realize your ambition P muscles of a super-man. Get strong and amaze your friends. We show you how to easily master feats which now seem difficult—or if you want physical culture for your ealth’s sake, ~ gotgmens is just ips ustable to give resistance up to 200 ibs. It is made of new live extra strength, springy rubber so as to assure long wear and give the resistance you need for real muscle develo also get a pair of patent sor developing — powerful ment. You hand grips grip and orearms. We include wall exercising parts which permits you LD develop your back, arms and legs—a real necessit know that business men oad @ athletes, too, vagy MS show their ing you how to ~—- any part of Fag body so that you will quickly get on with these exercises and gain the greatest advantage from their use. Act — —_ you can get in on this special offer. ight be withdrawn, so rush the coupon. SEND NO MONEY All of the items pictured on this page are included in this big special reduction offer Sign your name and address to the coupon jow and rush it to us. We will send your ten cable chest developer, the wall parts, a pair of hand grips, foot strap and the course by return mail. Pay t postman only $5.00, pius the few cents tage on arrival. (If you desire to send check or money order in advance, we pay postage.) GUARANTEE All Crusader products are guaranteed to give entire satis- faction or money back. SOR Crusader Apparatus Co., | Dept. 112, 44 Parker Ave., Maplewood, N. J. | I accept your offer. Send me everything described in your advertisement by return mail. I will pay postman $5.00 plus postage on arrival. It is understood if I am not entirely satis- fied after examination I can return the goods and you will re- fund my money. | I ] Note:—No C.0.D. Orders to Foreign Countries or Canada | 1 | | ! | l | City. 6

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, eo", POPULAR MECHANICS ADVERTISING SECTION 81 How | Made $100,000 (In Less Than 5 Years) Learn the secret of my success. Use my money-making system. NE hundred thousand O dollars—a comfort- able fortune. That's the net profit I made in less than five years in the big- gest and best business in the world. ‘And the hard-to-believe part of it is that I started right at home, in my spare time, with less than $5 cap- ital and no experience in the business. Of course, I don't expect you to take my word for this. You don’t know me. So I don’t blame you for saying, “I'm from Mis- sou But I do expect you—for your own Ssatisfaction—for your own profit—to sign and mail the coupon and receive—without a penny of cost or the slightest obliga- tion—the most convincing proof of the greatest oppor- tunity for business success you ever saw—proof of my own success— proof of the success of hundreds of ambitious men and women—from 21 to 65—who are using my amazingly successful business system—proof of how you—yourrelf—can use my method of money-making to build up & permanent, profitable business of your own—right at home, in your spare time. The Best Business When I say that my kind of a business is the biggest and best business there is, [haveat least ten reasons for sayingso. Here they are: 1. The business in round figures amounts to about 28 billion dollars yearly. 2. More money is invested in it than in anything else. . The money made in the business exceeds the output of all the gold and silver mines in the country—the product of all the oil wells — the dividends on all the railroad stock—the capital and surplus of all the national banks. It is the most permanent of all businesses. It cannot be injured by changes in fashion or by any human whims or caprices. The business is growing bigger every day, and nothing can stop it. . It is a pleasant, healthful, vocation. . It does not take years of study to learn like most businesses or professions. . It is a business suited to young and old of both sexes. . You do not have to keep a stock of goods, invest in machinery, or buy any expen- sive tools or instruments to get started. . You can start in your spare time, right at home, with a few dollars capital, just as I did. w es o high-class a N S FREE Book Tells How You can't afford to turn your back on this remarkable business opportunity Start right at home, in your I know of no other busi- ness, of any. kind, any- where, that includes all of theseimportant advantages. That is why I say it is the biggest and best business there is. That is why you should investigate this busi- ness at once. That is why you should mail the coupon now and learn about the big, quick money that is being made in this im- mense and profitable field. What Others Are Doing Enthusiastic letters pour in from those who are mak- ing money with my success- fulysystem. Read these words of praise: “Your system is wonder- ful. Without giving up my job as stationary engineer [ made $900 the first three monthsin my sparetime.""— M. J. Stokes, Pennsylvania. “Have been helped a great deal by your system I have now a hew car, two new typewriters, a stencgrapher, and a dandy office and money in the bank, all through my own efforts and without any capital to start with.""—Mrs. A. Moore, Connecticut. “Increased my income $8,000 in three months with your System.’’—A. W. Fos- green, New York. “Made $14,400 in less than six months with your System. Gladly recommend it.” —H. G. Stewart, Maryland. “Before getting your System was a Ford salesman averaging $300 a month. Have now increased my earnings 200%. Now own a Chrysler Sedan, up-to-date office equip- ment and have increased my bank account.” —A. J. Bennett, Michigan. There's no room here for more such letters, but sign and mail the coupon and you will receive a bunch of the most enthusiastic letters of businees success, you ever read. A minute's time and a postage stamp brings you full information about your big opportunity to make big money my way— build up a profitable business of your own— right at home—in your spare time—without capital or experience. Get the Facts at Once Tear out the coupon now—before you turn the page—and mail it to Pres. AMERI- CAN BUSINESS BUILDERS, Dept. M-44, 205 East 42d St., New York. Then you will have the satisfaction of knowing that you did not turn your back upon the biggest and best business opportunity that ever came your way. >/ and women make published. This FREE Book has helped MORE men MORE money in LESS time than any similar book ever / Name Get into the biggest business of all—where the most money is. Mail coupon and learn how. spare time. 7° Pres. American Establisbed 1917—(Capital $500,000) Dept. M-44, 205 E. 42d St., New York Send me—without cost or obligation— full particulars of how others are succeeding RY Business Buildgrs, Ine. vy, —and proof of how I can succeed in the best / business there is. AGGress.. 2... ceccccececes ceccscoocoosesacacnes ! errr rrTOeE TOTTI e eee eee eee

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a ae ahi ~ oes agua mE ox Get into the Air from the Ground! Aviation holds the greatest future of any vocation a young man can choose today. Get into it now, by the shortest, most practical route—from the ground, asa mechanic. With the new course in Aviation Engines offered by the International Correspondence Schools, you can quickly gain the knowledge that will qualify you as an expert aviation mechanic. The lessons re | written by such experts as Lieut. Commander Carpenter, U.S.N., formerly in charge of ead training at the Pensacola Naval Air Station. The course includes a study of the necessary Mathe- matics, Mechanical Principles, Heat and Its Effects, Com- bustion and Fuels, Principles of Gas Engines, including the newer Diesel-type engines, Construction of all present- day Aviation Motors, Carburetion, Ignition, Lubrication and Cooling, Pumps, Propellors and other accessories, Aviation Engine Management, Repair and Maintenance. You can start at once. No need to give up your present job. You can study at home in spare time. It costs nothing to find out all about this splendid new course in Aviation Engines, or any other I. C. S. course that interests you. Mark and mail the coupon today! INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” Box 5653-F, Scranton, Penna. Without cost or obligation on my part, tell me how I can qualify for the position or in the subject before which I have marked an X. D AVIATION ENGINES (Complete Automobile Course [Gas Engine Operating (J Automobile Electric Equipment [jComplete Gas Engine Course _|Electrical Engineering Architect Electric Lighting OjArchitects’ Blueprints () Mechanical Engineer | }Contractor and Builder L) Mechanica] Draftsman [JArchitectural Draftsman Machine Shop Practice jConcrete Builder Railroad Positions Structural Engineer Civil Engineer (1) Mining [ }Chemistry 0 Pharmacy Surveying and Mapping Agriculture Plumbing and Heating J Navigation CJ Steam Engineering Mathematics [) Radio BUSINESS TRAINING COURSES Business Management () Salesmanship ‘| Industrial Management Advertising Personnel Management Business Correspondence Traffic Management Show Card and Sign Lettering Accounting and C.P.A. ")Stenography and Typing Coachi {jEnglish [() Civil Service Cost Accounting ( }Railway Mail Clerk Bookkeeping [jCommon School Subjects Secretarial Work High School Subjects Spanish { )Tilustrating French LJCartooning TIIITID «sos nccccnosesosnsnccosncsosetnnesesoocontetonoserecsnesss cocessecesenenssongnaneneccssbooonne ante SP AMEDD ccts soccncccrecccetseescnscesescecuede . ati hiss acaniiigenicebtlniauinnelad i State ID coscccssnnst nacsssveses nobeenaneencurch secs segnpoussageconsesoooonsnetbncosenezenndpeasse® If you reside in Canada, “send this coupon to the ‘International Correspondence Schools Canadian, Limited, Montreal, POPULAR MECHANICS ADVERTISING SECTION WwW CARDS Get into this interesting, profitable fascinating business where the field is not crowded. Thousands of cards used weekly. Department stores, clothiers, movie shows, etc. pay big prices—work done ae and easily—profits large—hundreds of jobs all around you. Our students can more than pay for course doing jobs in spare time while studying. ——. a salary, get a better job or go into for yourself. Earn $50.00 to $200.00 a Week—Easily e will train you either at home or here a our big resident pA to fill a big-salaried a... job. Thi years successful teaching. Thousands of su ful graduates all over the world. No town too small. No je job too big for our graduates. Get our training. Start now. Big Money in Card, Sign and Bulletin Business No other profession pays such profits—work comes to you in abundance—no +4 = stump you—our students learn all. e new designs, how to run the POSITIONS , how to hire men, We have placed com- — keep records, in fact, petent students in = you @ complete ny 3 profitable positions | finish our course t pay good money a short time. Read our — Ang everywhere. The de- mand for trained, competent men is far — than the sup- and free out- fi mony pe er. ALL FREE. Don’t delay. Act Oo . Get Started Now. Detroit School of Lettering,™*§"-Detroit, Mich. SPLEEN. ALDI ILOD, PIE LELOLE LANCE IO A ACES NE Nearest their + gg ee where—to train for Firemen, Brakemen; Average $159-6300) ment! Promoted to Conductor or Engineer— highest wages on tan RAILWAY EDUCATIONAL ASSOCIATION, Depl. D-1, Brooklyn, N.Y, oa to earn gneiss lesson. ne Olt. EPAint photos—portraits, landsca rart FS | to $50 and more a week. "OIL Pat T OUT- GIiv Send oe for free illustrated book. PICTORIAL yas! STUDIOS Inc. Dept. MP. 2926 Broadway, Chicago, Iil. The Joy of Popularity! The Thrill of Extra- Time Money! Five Days’ Trial—Easy Lessons and a Year to Pay! pu days are a thing of the past, monotonous evenings gone oe when you learn to play the drums. The tamest party becomes a el Gon affair. In every orchestra and band a drummer is need od drummers get $3 to $20 fora night of “play!” .... Andit is so easy to play the drums! Sim- ple lessons, furnished without extra cost, show you how. Even if you can "t read a note of music now you begin “right off the _—* ** accompany famous orchestras on your radio or phono- . Soon you thrill friends and family. fore you realize ite yOu = Lepr fo make a “bid” for an orchestra, band or Fay u want to turn dull, profitless hours into SOYOUS E EVENIN SOF PROFIT, ask today for free literature telling all about the famous Ludwi line, easy payments, free lessons ard 5-day trial offer. No obligation. Simply fill in and mail the coupon. LUDWIG & LUDWIG, Dept. A-12, 1611 N. Lincoln St., Chicago Send me without obligation, full information on Ludwig Drums. Name Fe A a - City State as we Oe et ee et a

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wages a tail , WAY, POPULAR MECHANICS ADVERTISING SECTION s A Big Pay Job 7 Up to $15,000 a year for Greer Graduates, Electricity and Radio now pays hundreds of trained men up to $200 a week. Here are the world’s Greatest businesses. Billions —not millions—but billions of dollars are spent in them every year. Now is the time to get away from the low pay job! Learn in Only 3 Months i in Great Greer Shops on Real Equipment Mine is not a correspondence course. You can start any day or any evening. It is practical, easy, quick, fascinating trainiug. You learn on great, running live equipment in tremendous Greer Shops. Electricity is the fastest grow- ing industry in the world—Radio a close second, and yet in its infancy, is a billion dollar industry. Choose one of these wonderful professions today. Trained men by scores needed for positions up to $250 a week and up. Find out now about my great shops training. You Get Real Help to Big Jobs Five people are in my big Employ- ment Department, getting jobs for Greer men. You get their help before and after graduation. Don't let money hold you back. Get my free book. Learn how I get you ready so Employers gladly pay you what you are worth, made hundreds of $10,000 a year men. 90,000 in the’last 27 years have come to Greer. u- sands more in the future will likely come here. one of them. Send coupon to me for open- ings. GREER COLLEGE Dept. 41201E, 2024 S. Wabash Ave. HICAGO, ILLINOIS NN ot MM od Sot dalor-| B stole) 4 Erwin Greer, President, Dept. #1201E, 2024 So. Wabash Avenue, Chicago, Illinois. Send Free Book and details of Special offer, without obligation to me. = Own Your Own Business Be your own boss. Learn it all. Big men draw big money because they know the whole business, You can’t make big money by just doing one single little thing. Factories pay a very ordinary salary to “Jones” who screws on nut number 39, because they can quickly teach: some- one else to do it cm as well. At Greer College — learn how to the job. Quickest, Easiest of Ways to Become Expert I'll allow your fare here free of extra cost, then help you to a job while learning. Then I not only fit you to get a big pay job, but I'll help you hold it. , Sane and old, educated and uneducated, ex- me and inexperienced, have ound Greer Shops training easy, fascinating and valuable. You learn on big, actual, full size equip- ment like you will work on out on the big pay job. Coupon below brings details. DON’T DELAY! GET MY FREE BOOK NOW! GREER COLLEGE Dept. #1201A, 2024 S. Wabash Ave. HICAGO, ILLINOIS FREE Auto Book Erwin Greer, President, Dept. #1201A, 2024 So. Wabash Avenue, Chicago, Illinois. Send Free Book and details of Special offer, without obligation to me. by Flying The steady 27 years’ growth of Greer College, thru genuine service, speaks for itself. From a ama be ginning in 1902, to the present tremendous plant including three modern buildings and three air- ports in the Chicago area. Real endorsement by satisfied students and graduates have made this pos- sible. Aviation enthusiasts the country over have come to marvel at the tremendous outlay of motors, planes, instruments, wood an metal working equipment, welding and ignition shops. Many more have come to consult our Chief Aviation Engineer, C. L. Laird, regarding airplane design and con- struction. \Get My Free Book “Winning Your Wings” Learn how my students are now pre- posta for amazing opportunities iu his most fascinating and alluring profeesion—Aviation. Find out about my great shop and field training. Our rates are reasonably low because of our largeenrollment. Mail the coupon below for full details of my free em- loymeat offer and of the many ways nm whicb I help you to piiot’s and mechanic's license. Now All Can Learn to Fly My shop training plan equips you for ony ae of Aviation. Get the GREER COLLEGE Devt genet ketsete *™ IRS ot VUE bilelihsiele) 4 Erwin Greer, President, Dept. #1201, 2024 So. Wabash Ave., Chicago, Illinois. Send Free Book and details of Special offer, without obligation to me. |

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~4 a muscular marvel. Have the of a superman, Become wens for your health's sake or to astounc your friends with extraor- dinary feats which only men of giant strength can do. In a f short weeks you will easily do stunts which now seem dificult—then real and strength will strength of the Progres- sive Exerciser by eliminat- ing as many cables as you wish If you want great resistance so as to build up big solid muscles en use the full strength. How the Giant Chest Expander and Progressive Exerciser is Made The Giant Chest Expander and Pro- five” toe Exerciser is made with new rubber so as be finest rubber poseusable to each Free Instructions We do not think it enough to send you an exerciser worth double what we ask, so for a limited time, we offer is withdrawn. Your Guarantee The Giant Chest Expander is sold with a guarantee that you will say it is the i you ever saw or your money 5 Cables or double 10 oem for strength $9 ris 54 ae ‘00 ib ibe. How to Order—Send No Money Sign your name and address to coupon below and get your Giant Exerciser at the present low ~~ price by return mail. he price ade low because we want everyone to enjoy muscles and —— at the lowest ible cost. Don't pay more—order rom ue—get the mas for your money, Use coupon now ~~ ee Se ew we we oe oe oe oe oe oe oe oe oe PROGRESSIVE eanewes co., 4012 Langdon Bid way and Duane Street, New York OYour 10 cable Progressive. Please send Your 5 cable Exerciser. Ghock the Rowslecr you want, and & wil be cont you by return mail. Pay introductory price, plus few cents postage on arrival. It ts Understood that if you are not entirely satisfied with your exerciser you ure it within 5 days and get your money back, Name........ Peeseteccsscsesocceescosoecnocecocecese DE daseesGebnbeheerseedadreccneésacaeduesssveseee Pec ccccccccvcccccccccsocaccce BOMB. . crcccccccvces If you live outelde the United States. send cash with order. aes we eS SS SS SCS SSB eee eee ee = oh POPULAR MECHANICS ADVERTISING SECTION t home, this t _. aie La fe - te Ao note ¥ > onl Mt par. nm furnished $100 to $500 stersen® DO YOU LIKE TO DRAW? Billy Hon’s Famous Cartoon Book Will Teach You Develop your talent, learn this interesting and = profession. Billy Hon, the celebrated dev isedasim ple, up-to-date course = Castogaing 7 of nay ta with over time, Rent postpadd Yor BI00 oueide of Us Be Stas. Co., 210-P West 14th Cal. Los We teach ambitious men by actual welding practice. me OXY-ACETYLENE and ELECTRIC ARC— Pipe-line, Sheet Steel, Structural Steel, Aircraft, Cast-Iron, Alum- um and Goenmanelel Welding. Cutting, Brazing and Plating. Splendidly Equipped to Teach You oe Rapidly and at Reasonable A Free Booklet for ‘You—Write for it Now. rest COLEMAN neuen SCH 1628-X Main St Hi TELEGRAPH iCOD =m Morse or Radio : ATHOME .SVouatn Leads quickly to money U.8. Gov't., Se » ete., a aice Age Catalog. City, Mo, jobs. The essy and cheap way. use it. THE W WORLD’ SS lobby. special gs and chor e-up. Coteiog Free. TS. Denison & Co., 623 S. W Wabash, Dept. 19 Chicago ef: PAINT SHOW CARDS SIGNS. LEARN AT HOME IN SPARE TIME. WE Teacn you my _ ba ee WORK. $75 */ WEEKLY. CIRCULAR. SEND Gc IN STAMPS Fi Universal School of Lettering ne even, "BASHEUL embarrassed in com- pany of the other sex! Stop being shy of siraneers jn ible fear of your superiors. and future! Your ie easily > a Send 25¢ Or Ne can enjon life: life to t Ke fullest. ay /MECHANICAL DENTISTRY EARN BIG MONEY—Steady Work WHY spend the best years of yous life at uncertain jobs at small part You canEARN ILE LEARNING this modern money making business and become independent. BIG DE- MAND. You LEARN BY Rog SEND FOR structions. Easy terms. Railroad Fare '2°S a aes ttlte.@ Allowed — No Extra Cost. Address “ad SECRETARY, N. Y. SCH OF we ee MECHANICAL DENTISTRY, 147 Your 7 W. 33rd Street. NEW YORK, N.Y, Write or 3 or Mail C Coupon. Street City

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at 1oss a oe! POPULAR MECHANICS ADVERTISING SECTION are Two Books— Mail Coupon! Yes, Absolutely in Great Industries—Learn At Home | ° high school graduate. Automobiles—Electricity—Motor Busses who are making —Aviation—Building Construction. cameo you plan industries and in hundreds of Aviation is expanding to enormous sensations. Comfo Electricity is getting bigger every day. Motor Bus building is becoming a leading world industry. Building of stores, homes, factories and office buildings is going on all the time. There are jobs for Draftsmen in = of these others, or you go into business for yourself. AsY NeedI others. Get started now toward a better gestion, pay- ou t ing a good, straight salary, the year around. Emplo built without plans drawn b loyers of ° . I train you at home, in Drafting. mg the Because they +. that Dobe Trained Men | I will advise you about + make good as . by actually doing the work themselves, ina | jobs, extra work, fees and a know they are not men trained by me, job you have now while learning draftin I will train are in your 6 If You care Less Than $70.00 a Week Ask for My 2 FREE Books | mew in a | right ao you ractical im | fale 8 coupon, at once. at AL Raisin; g ically all industries, for Draftamen. These two books are Free. They come to you post paid. Mail the Coupon for them TODAY. ENGINEER DOBE 1951 Lawrence Ave., Div. 93-59 Chicago Just Send the Coupon Below! Jobs for Draftsmen not necessary. You do not year. There isa big fi rtable surroundings. ‘Inside wo Earn As You Learn I tell you how to start earning extra money a . few weeks after beginning my training. want toand as oftenasyou yment Service No structure can be erected without plans After training you I help you to get a jo ~~. — help on any subject per- drawn By s draftemen. Ho machinery canbe out charging you a cent for this serv Em- | taining to draftsmanship. y a draftsman. to You get these Gen- uine High Quality, Imported Drawing Instruments, 14 Other Tools and a Drafting Table — all incladed in my Home Training Course. Money-Back Agreement I train you at home under a positive Money - Back Agreement. If my training does not satisfy you after you have finished, you get every penny back. Age or Lack of Education, No Drawback Previous experience is need to be a college man Sofas tor datamen ee | Help As Long supervise the work of As my student you can write to me any time you like and I will give you have learned drafting how to make extra money. FREE BOOK COUPON ENGINEER DOBE 1951 Lawrence Ave., Div. 93-59 Chicago Send me free of all cost your book, “‘Successful Drafteman- ship’’, also plan to earn money while yoy E = ay of big mone Lveyes positions, Also your new sing Name Age.

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POPULAR MECHANICS ADVERTISING SECTION err THE FINEST ys VON es United States CCIMAMN “fo APPROVED SCHOOL for Transport- Limited Commercial Private Pilot & Ground Course There is money for you in aviation if you get thorough training now! Our courses will give you this training—they are taught under the direction of U.S. licensed transport pilots and mechanics and cover everything about planes, motors, their maintenance and construction, The train- ing which the student receives at the School of Von offmann is the exact training which he must have to qualify for immediate positions on the ground or in the air. Our equipment is new and of modern design, sub- ject to daily U. 8. Gov't inspection—the cost is low con- sidering actual flying and the thoroughness of ground instruction on latest modern type planes, Wright Whirl- wind and other standard motors. No student bond required. WORLD'S FAMOUS PILOTS TRAINED HERE Our field is identified in the world of Aviation as an out- standing place to enjoy the best training—a place where conditions are ideal—from here was started the ’cross the Atlantic Flight that convinced the world what could be done and more recently the world endurance flight record was established here. EASY MONTHLY PAYMENTS It is easy to pay the Von Hoffmann way because small monthly payments are extended. Let us show you how you can start now and pay later, even after you have finished the course of training. VON HOFFMANN AIRCRAFT SCHOOL 124 Lambert-St. Louis Flying Field ST. LOUIS, MO. VON HOFFMANN AIRCRAFT SCHOOL 124 Lambert-St. Louis Flying Field St. Louis, Mo. MAIL TODAY Please mail FREE information at once. corres vewxee I am interested in FLYING COURSE 0 GROUND COURSE 0 The biggest value you ever saw advertised anyw eeeeeen Haven't you often wished that you could draw —artoene, iMlustrate some idea, sketch some pretty face, etc You can do all of these things. One of America's most famous Cart ists and ill 3 hus de- sore a rat. simple wey for success in all branches of Commercial This system has revolutionized the entire enery of drawing. It means that drawing can be as easy for you as writing — much simpler than learning shorthand, bookkeeping or typewriting. ie are now placing this original system for learning Drawing, Art and Cartooning, consisting of 34 lessons with over 500 illustrations, = = of every one. If you will devote a few urs each week to the Course WE ABSOLUTELY QUAKANTING that you will learn to draw and draw well before you have half finished the Course. If we fail to make this claim good, we will refund every cent paid us. By eliminating a large office force for answering correspondence, expensive cat- alogs, ete., we are enabled to make a price of $2.98, the cheapest price ever known for a high-grade, home study course. Learn to draw. It isa big asset, no matter what field you are 2 Drawing Course $2 No Money if order the t Just order the course pt og we will include ‘a and on arrival drawing oatfit, consistin; pay postman of artist's pencils, pens lus a few cents postage, payment in full} Porc" egreners, the — ‘or theentire Course and Drawing Outfit. to goto y to work ek without any lfnotentirely satisfied, return within five days and we wil! Refund Money. Address: LEDERER SCH of DRAW! Dept. 224-5, Chattanooga, Tenn Orders from outside the U.S. 0 8. A. are payable $3.28 cash with order, OOL ty Ba eitan qateeaee —— GIVEN! Boys! Here’s the Navy model Airship. Large 6-foot air bag with inflators, parachute with auto- matic release and complete instructions for fying, Will fly for miles at height of 1000 feet. chance to study aerial a} navigation. Send Dame one we'll Sot gur f pew to dispose o: 2c the $1 Bos you collect gad as 9 reward cyt serjon we mil .M. Thomas, 337 W. Madison St., 12-K-91, Chicago MAKE $36 A DAY# Showing This SELF-LIGHTING © exnaveriie ding spells and bashfu are caused by Pocket to Smokers _ - » tonics and very canna heip weak, The world’s only windproof automatic cigar sick, we Sy ag oy how to regain Vigor. Calmness and Self Confidence. Send 25¢ fo flash demonstration to smokers and lighter. Lights instantly without flint or fric- Excited? F w _ a Een Cc ‘Snatipattons indiceat er | a = amazing book tion. Guaranteed for ten years. Everyone wonders what makesit light? Sellsona 71 LDING. » Y. Complete Complete Course in BOXING» Wy Jiu-Jitsu & Wrestling : = Complete course in Boxing, for only $2.97. Our scientific methods cut time of learning in halt. Teaches the blows used by profes sionals—Dempsey’s Triple, Fitzsimmons Shift, ete. Every blow illustrated. ‘Rise Wrestling, Jiu-Jitsu and History of Boxers. Six big ks—hundreds of pages. Send no money—see coupon. a Marshall Stillman Association, Dept. 12-M. 247 Park Avenue, N rk Send on 10 ds approval complete Self-Defense course. 1 will deposit $2.97 plus postage, postman, I will return course in 10 days if not satisfactory and money will | be refunded. (Outside U.S. A.—Cash with order.) wien, y Street and City.......ccscceecereccereecerecsseeesers i di rry ae ae ee ee ae ee. ee |

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POPULAR MECHANICS ADVERTISING SECTION Most Amazing INVENTION in 25 Years “Cleans Up” for Agents $90 Weekly in Spare Time Men, here is a wonder—the most sensational invention of the age! If you are looking for a rapid fire seller—an item that nets you 100 per cent profit—an item that sells itself to seven out of ten men on demonstration—l’ve got it in Ve- Po-Ad, the amazing new vest pock- et adding machine! Sells for $2.95 You Make $1.65 This most remarkable invention does all the work of a $300 adding machine, yet fits the vest pocket and sells for only $2.95! It sells on sight to storekeepers, business men, and everyone who uses figures—and makes you over 100 per cent profit on every sale! Ve-Po-Ad does any kind of figuring in a jiffy, yet weighs but 4 ounces. Counts up to a billion. Shows total visible at alltimes. Perfectly accurate, lightning fast. Never makes a mistake or gets out of order. There are over 100,000 in daily use! FREE MACHINE FOR AGENTS Get Your Machine FREE! Live wire salesmen are drop- ping everything else and flock- ing to Ve-Po-Ad. Ve-Po-Ad brings them quick money and lots of it. Shapiro out in California made $475 in one week! You can “clean up” too! Only 10 sales a day in spare time will bring YOU over $95.00 a week! You need no previous sales experience—Ve-Po-Ad sells itself! If you are really interested in earn- ing a steady, substantial income, write at once for full details of my MONEY-MAKING PLAN and FREE VE-PO-AD given to new Agents. Do it NOW—TODAY! C.M. CLEARY, 303 W. Monroe St., Dept. 44, Chicago, III. - ’

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88 POPULAR MECHANICS You Can Learn ELECTRIC REFRIGERATION SUCTION UNE TO COMPRESSOR eo WOu'ID UNE TO f.Oat wavt COMPRESSO® Smut OFF vawE RECOVER ADJUSTABLE FEET Men in Big Demand! Hundreds o1 thousands of Electric refrigerators in use. Thousands being installed day aiter day. ‘Trained service and installation men are in urgent need in this new, fast growing industry. Big money awaits men who master the principles of Electric Refrigera- = oe School of Engineering of Milwaukee— America's greatest ec COMPLETE PRACTICAL 90 DAYS COURSE includes Electric Refrigeration, Applied Electricity, Merchandising, and Practical Mathematics. me of the topics are: Physics and Chemistry of Refrigeration, Heat and Heat Transfer, General Theory of Refrigeration, Systems of Refrigeration, Household Com- ression Systems, Refrigerants, Household Absorption Machines, efrigeration Cabinets, Installation and Repair, Maintenance, Troubles ana Their Cures, Sales and Merchandising. All instruction is thoroughly practical. Splendid equipment and laboratories. WRITE FOR FREE BOOK TODAY “Your Future in Electric Refrigeration,”’ a fascinating book describing the School of Engineering course in Electric Refrigeration will be mailed free. Also contains details of *“‘Earnm While you Learn” plan, and facts about our employment service after you raduate. Unlimited money making opportunities are open in lectric Refrigeration. Write today! New Class Organizing Now — Mail Coupon SCHODL of ENGINEERING \ lwaukee 163 East Wells Street P.M.1229B MILWAUKEE, Wis. Founded 1903 School of Engineering of Milwaukee, P. M. 12298, 163 East Wells St., Milwaukee, Wisconsin. Send me FRE E, with no obligations, a copy of “YOUR FUTURE IN ELECTRIC REF RIGERATION.’ ADVERTISING SECTION MOULDING A MIGHTY BACK EXTRAORDINARY Complete Course on Back Building ONLY 25c Does your back back up your physical dreams? Have you the shoulders of a Guardsman and a spine as straight as a die? If not, don’t waste time craving them but GET THEM. The back is actually the easiest part of the body to develop—provided you follow the right exercise principles. No man need be narrow or round shouldered. You can build huge, powerful mus- cles from neck to hips in an incredibly short time by following this wonderful book. “MOULDING A MIGHTY BACK” is a complete treatise on back devel- opment packed full of splendid, illustrated muscle- building exercises and other information wonderful for developing every muscle in the back. Make Your Spine a Column of Might Arthur Saxon became the strongest man in the world’s history through the massive Herculean muscles that surrounded his spine.” The author gives you Sax- on’s favorite exercises—and many others, be sides fas- cinating instruction on how to use your back muscles to perform great feats of strength. It is one of the most interesting books he has ever written. Deals con- clusively with the Broad of the Back. More complete than any other course at the price. Will repay you a thousand fold in strength and muscle. With this won- derful book will be given a copy of “The Thrill of Being Strong.” The sort of book you have always longed for. Right now, 25c and this coupon means your positive success in back building. Get it now while the offer holds good. Worth $1.00 of any man’s money but yours for 25c if you act today. REACH OUT---GRASP THIS SPECIAL OFFER JOWETT INSTITUTE of PHYSICAL CULTURE 422 Poplar Street, Dept. 4Z, Scranton, Penna. Dear Mr. Jowett: I am enclosing 25c. Please send me the course “MOLDING A MIGHTY BACK” and a free copy of “THE THRILL OF BEING STRONG.” Name. Address Her solt Op: Age Ww Fac OF for soa col rag the the th jas co mt sts be lif it’ go op

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i for les POPULAR MECHANICS ADVERTISING SECTION 89 New Million Dollar Can Opening Machine BRAND NEW INVENTION BRINGS FORTUNES TO AGENTS! Here’s Something Brand New! An Amazingly Simple Invention—Yet, Ab- solutely Revolutionary! For Now, At One Sw Millions Of Old Style Can Openers Are Doomed To The Scrap meee! Think Of It, Men! A ee dous New Opportunity For Quick Profits In Every Home In America! io Wonder Agents / Are wenens f Astonishing, Almost Incredible Sums—$75, $100. $150 In A Week Easily Right Along. So ‘ail The Coupon For All The : Facts And Full Details Of My Remarkable FREE TEST OFFER! ABOUT once in a “‘blue moon” some genius pops up with a new invention that everyone has been waiting for. Then, presto! Almost like magic, agents’ profits go soaring overnight to tremendous heights! And now the cold, hard-boiled facts about this amazing new can opener bear convincing proof! More Than a Can Opener This queer new device doesn’t just cut a ragged hole around the edge of the can. It lifts the entire top completely out, clean as a whistle! The machine holds the can—opens it—flips u the lid so you can grab it—and gives you back the can without a drop spilled, without any jagged edges to hack your fingers—all in a ont of seconds! You just put the can in the machine—turn the handle—and almost in- stantly the job is done! Built to do the job better than anything ever devised! Will last a lifetime! It’s far more than just a can opener, it’s a real can-opening machine! The Secret of Big Money Women hate the old style can opener—and with good reasou, too. It’s the last relic of barbarism in the modern kitchen. Yet every day millions of women have . open cans the dangerous, laborious old-fashioned way spilled and wasted. Fingers are Act Quickly! If you are ambi- tious—if a new, but cut and torn — often followed by py —_s ! infections and blood poisoning that pA 8 $75 to $150 in AGENTS! result in expensive doctor bills. a week interests you FULL Spesing cans Ge old er is a job —act at once before some other live wire beats you to this lifetime es Fn maar make most any opportunity. Without obligation, learn about these amazing new TIME— an swear— this amazing hew way patented inventions, and get my FREE TRIAL OFFER. Just —it’s so easy a ten year old child mail the coupon today—NOW! $265 can do it with perfect satety! No ie wonder women—ani men, too— — CENTRAL STATES MFG. Co. “Here is my record for 4500 Mary Ave. Dept. W-703 St. Louis, Mo. = 30 — with peeeee A S l —June 13, 60 Speedoer; Juns “20,” 84” Speedos! pectacular une 30, 192 Speedos; _ july | 6. ni38 _ Speedos. New Sales Plan r ‘ : ; 8 0 —° | CENTRAL STATES MFG. CO., M. Ornoff, Va. I want you to see this surprising | 4500 Mary Ave., Dept. W-703, | SPARE TIME— new invention with your own eyes. St. Louis, Mo. | $9 first half day I waat you to know whyeveryone, | Yes, rush me the facts and details of your FREE TEST “The first afternoon I re- man or woman, ~— for it the in- | OFFER. | ceived my Speedo outfit I stant they sze it. Whether you are made $9.” an experienced salesman, or never | EE ee OP ee tay ~ ans Oe | Mrs. R. Spain. Kans. sold a penny’s worth of anything f Te Se ae a : = p PART TIME. d in your life—I want to tell you 1 | $20 in 3 hours about a remarkable new sales plan ee nee Pe 6060 “I worked about three that wins you a profit on every call l | hours and took 25 orders. | YOu make. This plaa is made pos- City saveces Sillcccocesedeeen l ‘Lhis is certainly a mon- sible by another spectacular money | ence Tne SeEeeae ys. ey-maker.”’ maker in the —— line anu -— | ] 0.C.G rx antees you a steady iacome of up 0 Check here if interested only in one for your home C_ Gregg Wyo] to $150 in a week! FB icc agen techy pomp digs tesng ines

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90 POPULAR MECHANICS ADVERTISING SECTION (RR ~™ Body Chart If you will mail the coupon below, thi Anatomical and Physiological Chart will be pomene to you without one cent of ex- It shows the io Socanee of the Or- gene. Soma Ronee of the Body, Muscles of the y, Head and Vertebra Column and tells you how the nerves radiate from vowed -—~ cord to all organs of the body, is be in every home, Where Is That PAIN ? be in the neck. beck, hi . Whereve te fo the chart FREE! Violet Ray — Vibration Ozone — Medical Electricity The Four Greatest Curative Powers Generated by This Great New Invention! +R for you! If ~ ‘wast more health—greater po joy the pleasures and rope j socut you. or if more bes: > desire— ik for Here’ s What Elco Users Say= “Wouldn"t take $1000 = oe me ie Electric Health © Generators

“Cured m: Rhoumatl ism.” “Cured, stomach bei ed “Cured i my “Now "1 aicep oc soundly’ 8 “mn night.” "racks to ay, strength an wer are re back." » No more pain.” “Colds never bother me “bad “Chronic Constipation banisi . Mee Re Vibration, E3 great new saventione qonsente iol y. ration, Eleoe ele and Ozone—combined or separate, They operate on the Free Triel ete light in your b home or on their own motive power at less than 50 cents per yeats Health Ge rs are positively the onl: _instrum: ents which can oy Po a =: om Electricity, Violet Ray— pn, and Ozone—t. Ky reatest Tiantive agents, ree Book NOW! MAIL COUPON | gests for FREE BOOK \toxs, Do not put this paper down without sending the co’ Don’t go on as you are with pains nd a with almost no life and energy. You owe t to to be a better man or woman. You were put joy Paden just to drag through it. So do not fest another da we ou have put your — on the these gread ae a hee ole story of new «| indstrom & Co, [Mekere of Therapextic} mannang = 2322 po omy eam Dept. 13 $9 Chicago § Please send me your free * pan \— Power— Beaut; $ full information of your 10-day Free Trial Otter. —_ | on ER a ee eR . H Hy S AddrEss....sccvevevecsseceseccceveeseseseseecsccccsseses §

Don’t Be Afraid "nat Concrete Job! With the instructions found in the new, revised edition of Popular Mechanics Concrete Handbook you can make any of the following useful articles: and Bird Baths—Ornamental Pools— Drinking Fountain—Gate- Auto Driveway—Sidewalks— Landings and Docks— Entrance and Garden Walks — Sidewalk Flag- ing—Narrow Curb Walks—Curbs Gutters—Wall Coping—Steps— Garage Floor—Basement Floor— Fence Posts—Lawn Roller—Cistern— Chimney Cap—Refuse Burner—Cul- vert—Benches for Greenhouses— Tile—Retaining Walls—Foundation Ry Foundations—Sep- k — Toy Blocks — a Safe—Ice House— Watering roughs— Milk House—Smokehouse— Silo—Horse Stalls—Hitching Post— Rural Mail Box Post—Cyclone Cellar. Build With Ease for Permanence and Bea This is a book of practical plans for using concrete about the home, farm or shop. For amateurs as well as con- tractors. In addition to making all the articles men- tioned above the making of good concrete mixtures for various classes of construction is given; mechanical mixers and homemade tools are dealt with. All aecessary form and mold making are covered as well as many other valuable pointers too numerous to mention here. Simply write and ask us to send you this book. When postman hands you the package pay him $1.00 plus the postage. If outside U. 8. remit when ordering and in- clude 15 cents extra for mailing. POPULAR MECHANICS PRESS Room P12 200 E. Ontario Street CHIC, [~—s«sC §@C aon eae | C FOR YOUR HOME WORKSHOP _ If you like to make things, you will enjoy this new book just published by Popular Mechanics entitled Make It Yourself The home mechanic, whether young or old, amateur or pro- fessional, will take pride and delight in making many of the things described therein. Both father and son will find fascination and an association of interest in making useful and ornamental articles for mother to admire upon their com- pletion. 900 Articles All Different There are attractive ship models, a great variety of toys that operate themselves by means of an ingenious application of mechanical! principles, nbovel amusement devices for indoors and outdoors, for both water and land, unique designs in furniture for children, scores of useful appliances for the home, things of beauty and utility for lawn and garden, etc. Special articles instruct the amateur mechanic in the care and use of tools, special tools for special purposes, how to read and use plans, how to solder, the making of a handy work bench, cuts, joints and methods in woodworking, automobile repairing, installing radio equipment, house wiring, fixture hanging, working in glass, leather, metal, celluloid, lathe work, utilizing parts of old maeeanee to make equipment that would 480 Pages 823 Likus — i ‘ages— ustrations bf Size 7x10x1%4 in. Cloth Binding Price $3.00 Mailed Postpaid upon receipt of price anywhere in the world. If you reside in U. 8., Hawaii, Porto Rico, Alaska or Mexico, we will send the book by mail C. O. D. if you prefer. POPULAR MECHANICS PRESS (ROOM P-112) 200 East Ontario St. Chicago, Ill.

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a r d 1e d Actual size of Magic Dot. The new system weighs only 4 ounces, yet holds rupture more securely than pounds of steel springs, and hard, gouging cushions. ri. POPULAR MECHANICS ADVERTISING SECTION 91 Beware the Small Rupture THAT “DOESN’T BOTHER MUCH”’’ eight as a feather Yells Rupture! First Day. SCIENCE has at last developed a tiny, interesting device weighing less than 1/25 of an ounce, which has helped to free and amazed thousands of rupture sufferers and won the ad- miration of many doctors and scientists. The New Science System makes utterly obsolete all painful trusses, gouging knobs, steel springs and unsanitary, cumbersome leg straps. It ‘‘Breathes’’ Air Magic Dot anchors a flesh-soft padlet composed of a newly perfected substance named Airtex. This is honey-combed with microscopic air cells that tend to “breathe” air with each movement of your body. It expands and contracts as easily as your own flesh. When you walk, run, bend or exercise it tends to Squeeze itself—not the part of the body it rests against. The appliance is so light—so comfortable—the wearer as a rule hardly knows he has it on. It does not produce that “hot spot” feeling. Sanitation is now more sure—because the padlet can be washed clean and sweet in a jiffy. Now—An Ohio Scientist Is Helping Nature Rescue Thou- sands Of Rupture Victims From The Eternal Horror Of Many Dangerous Cumbersome Trusses And Other Tor- 7 turous, Harness-Like Contraptions. A Tiny, Feather-Weight Magic Dot That Frequently Brings About Joyous Relief And New Comfort From The Countless Former Victims Everlastingly Thank This Interesting Discovery For Their New Happi- ness. Just Mail The Coupon For Free Material Sample If You, Too, Want New Freedom. He Has Perfected Immediate relief and new comfort are not the only things the New Science System should accomplish. Of far greater importance is the comfort you have dreamed of—the possi- bility of ultimate FREEDOM! This should be possible because this amazing new method gives nature a chance to heal the rupture automatically. This is not possible with gouging trusses that prevent free circulation. Test Sample Free Send no money. Just mail the coupon for Free Sample of remarkable Airtex. With it we send, without charge, latest copy of a very new and informative book on Rupture and Hernia that should open your eyes. NEW SCIENCE INSTITUTE 2167 Clay Street Steubenville, Ohio New Science Institute, 2167 Clay St., Steubenville, Ohio. Without obligation send me a no-cost Airtex sample with new book about rupture and hernia relief. PRIMED. cc cccccccccccccocccccsecvcesccesesesssoosnecesees RBGIs 5 nc cccccccvcccccccccccececssesececosevesecegenn City oo UBER. wcccccccccces

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92 POPULAR MECHANICS ADVERTISING SECTION ADERWOOD blow 72 Price Famous Medel No. 4 Now ONLY ! Standard 4-Row Keyboard Think of it! Only $1.00 brings the World’s most famous Underwood Typewriter for 10 days’ free trial. Lowest price and easiest terms ever offered. Pay only 10c a day on easy monthly payment plan. This is the full size standard Under- wood 4-row keyboard typewriter, manufactured to sell for $100.00. Do not confuse this 4-row standard office model Underwood with other frail machines originally costing only one-half as much. 10-Day Free Trial This late model Underwood, spe- cially priced at $39.90 cash, is the lowest price ever quoted; 2 modern improvements including 4-row keyboard, two-color ribbon, ec t, ribbon reverse, tabulator, re- lease, shift lock and many other improve- ments, Beautifully refinished and re- newed. Looke and operates like brand new. Other Bargains! FREE — Course in Touch Typewriting We teach you free. Complete No. 10 SS $100 Model, Home prety om jee famous Cash, Now Only...... $39.9 t ph full "illustrated: " easily -. 8 L. = ‘Smith $100 Model. learned, used in schools, business 2 Jas ow Only...... $39 offices, overywhere. No. 5 Woodstock $100 Mode, Cash, Now Only...... $ Pee ee ee ee ee ee ee ee ee ee ee ee ee es i International Typewriter Exch. ‘ Dept. 1294 231 W. Monroe St., Chicago. § O L. C. Smith No. 8. i i O Underwood No. 4. O Remington No. 10. O Woodstock No. 5. j Send typewriter checked above for 10 days Free Trial. I am enclosing $1 deposit with understanding that it will be returned Y if the typewriter is not satisfactory. If I k i a month until $44.90 (term price) is paid. Bea ak eines ches cecbecsvcondes Age eep it I will pay CARTOONS Cougs 32% COMPLETE Easy to Learn this New Way For fun and profit learn to draw cartoons and comic strips. Amazingly simple system developed by CARL ANDERSON, famous contributor to SATURDAY EVEN YORK JOURNAL, NEW and other leading publications, gives com- lete instructions in DRAWING, CAR- ‘OONING, COMIC STRIP AND ITLLUS- TRATION. These easy lessons make draw- ing as easy as writing. Spend only a few hours a week practicing and you will be able to draw and draw well in a very short time. 48 lessons, hundreds of illustrations, cost pa $2.98, oe — or over offered in s SEND NO MONEY. the postman $2.98 plus We positively GUARANTEE MONI Y¥ BACK if the course is y—Address NING , NEW /OF SEND NO MONEY pono Bo Sigs We not everything we claim. THE CARL ANDERSON SCHOOL OF ART MADISON, WISCONSIN Send $3 28 cash with ord-rs from outside US.A. No Better Christmas Present for $2.50 than a year’s subscription to Popular Mechanics Magazine Containing 3600 Pictures and 3600 Articles Much of it Interests Everybody Most of it Interests Anybody All of it Interests Somebody Order through your Newsdealer or address the Publisher POPULAR MECHANICS COMPANY 200 East Ontario Street, CHICAGO, ILL. Here’s Your Chance to Get an Education The quickest, surest, easiest way Here is the knowledge that gives real edu- cation—all organized in a single volume. It is really SLX booksin ONE offering in simple, clear, fascinating style the understanding you need of History,Science,Lit- erature, Art, Phil- osophy, Religion —the six great branches of knowledge, an under- standing of which will give you the education that brings SUCCESS and LEADERSHIP. Here is the easiest, the most practical, the most interesting method of self-education— The Outline of Man’s Knowledge The Pittsburgh Sua-Telegraph calls it “A Uni- versity in itself.’’ Here is the whole scope of modern education in one thrilling narrative of 7+0 sparkling pages—the cream of the world’s knowledge for quick and easy self-improvement. Read It FREE __Use This Coupon — Lewis Copeland Company, Dept. 566, a 119 West 57th Street, New York City. | Kindly send me THE OUTLINE OF MAN’S KNOWL- EDGE, by Comens Wood, 700 pages, illustrated, handsomely bound. Within 7 days, I will either return the book or remit $1.50 as first payment, and then $2.00 per month for two months, a total of $5.50. (Ten percent discount for cash with order. Same return privilege.) i+ ETE ee ere eee eee If outside continental U. 8. send $5.50 with order. cries cease dee deseeto-enniesemeste cen einen costa mes camntn aiat rT =. in On by au N.

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POPULAR MECHANICS ADVERTISING SECTION 93 0 pra Learn at Home y in Spare ns ~ us NG Ww LUD m= R- Sg. Ww ew be / ort 4 ns, 33 and More cu Get into the big-paying field. Prepare yourself through our practical, fascinating instruction. Draftsmen and tool designers are always in demand. The highest paid men today in any a industry are the production and tool engineers. — — : Best Equipped, Largest and Oldest School . in Michigan specializing in mechanical drafting and tool designing. Learn quickly by mail, or come to Text books written in this school endorsed by leading universities. Detroit, the center of the automotive Our methods are simplified and easy. Lessons given personal attention and airplane industry, and attend our by chief tool designers and chief draftsmen from Detroit's largest resident classes. automobile plants. | saluatieeetientiestieetientineetanstiantantenmnentanstantantiana : OUR GRADUATES EMPLOYED IN EVERY Detroit Schoo! of Appiied Science. Inc.. -8213 Woodward Ave., Detroit, Michigan. DESIGNING ROOM IN DETROIT Please send complete information regarding your Leading manufacturing plants recognize our school. We have more | instruction in calls for graduates than we can fill. We help you in securing a position. | 0 DRAFTING 0 TOOL DESIGNING In every city there is a demand for well-trained draftsmen and tool designers. | Neae Detroit School of Applied Science, Inc. d 8203-8213 Woodward Ave. Detroit, Michigan oul 7 SPORTSMEN Read This Offer! Send the COUPON and receive a magnificent Sportsmen’s Book telling you how to learn to MOUNT GAME-HEADS, BIRDS and ANIMALS. Youcan NOW be your own Taxidermist. Our school has over 100,000 graduates throughout the world. You can now learn AT HOME in SP. TIME. Mount Your Own Trophies! Hunting and Puhing have entered a new era. Alltrue sportsmen now kill fewer us epecenens, but SOULS their interest by The of Taxidermy (mountin: on birds pad o nimals) are now revealed. You CAN NO Now LEARN TAXIDERMY FOR Y OURSELF. Be a Taxidermy artist. Mount birds, animals, game-heads, fishes, tan skins and make beautiful rugs and robes. Easily and quickly Sanened 2 in. your own home. Adorn your home and so with nature’s finest ART. If you enjoy peat you will enjoy Taxidermy MO n Bi or SPARE TIME to T MONEY? Make 23 ro ‘axiderm: e P. ig Profits & 0 $250 a — Lo | Specimens. for others or Es a4 your, mouse imens, or go into busi- ness—open a Taxidermy shop of your own, and 000 to $6,000 a year. This Book FREE = Every Sportsman should have this marvelous book. You can right pow, while this edition lasts, get a c op Free and prepaid by mailing the coupon NOW. Only limited number free—Sen Today. Nothing like it. Just off the press. Contains 48 large pages and cover in brilliant colors. More than 100 photos of splendid game specimens and masterpieces of the National Museum at Washington. Brim full 7. of interest to every sportsman. And think of it, this —— po he and artistic book can be had RS aay ag eter x —a now, by Sportsmen for the asking. a N. W. School of Taxidermy * y s 3379 Elwood Bidg., Omaha, Neb. * e} Mail theCoupon!? ®@ Send me your free illustrated book ‘“‘Sportsmen and Their 8 # @ Trophies.’’ Also tell me how I may learn this fascinating 8 : \ If you want to preserve your trophies; if ™ ®t easily and quickly by mail. No obligation. } you desire to eke money from your spare S ¥ s time, if you are a nature lover—send the & # — and receive your copy by return @ Name . a + 5 * CC er N.W. School of Hg 3379 Elwood Bldg., Omaha, Neb.

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5 DAY TRIAL - NO COST 1F NOT SATISFIED Gain New Power! UIT being just one of the crowd! Stand out—dominate—make others admire and obey you! Learn how to bend people = your'will; how to develop a winning, magnetic personality; how omain popularity, success, big money—by the USE OF HYP- ae just ‘a few hours, I'll show you o inner secrets of this mys- terious force or the Five Days’ TRIAL IS FREE! I'll show you how to develop the hidden germ of this magic power within yourself. Once you know how, you can use it in overcoming obstacles, achieving your fondest ambitions and becoming MASTE SR of your- self, friends and acquaintances—either sex. Hypnotism can banish fear, worry and opposition— improve your memory—increase your earnings—and force others te give you the good things in life that you desire! In this startling NE Ww book “The Science of Hypnotism,” the world famous Hy pnotist—Prof. L. E. Youn Mysteries of veals t t carefull je >I this fascinating subject and ard : ALL! H Hypnotism Revealed not. A explains the methods of noted hyp- —How to Hypnotize notists, step by step—but tells clearly all about the nine stages of hypnotism. The Hypnotic Mirror, Mental Telepathy, how to select your subjects, magnetic healing, methods of hypnotiz- ing, how to waken subject, how to make money out of hypnotism! Try 5 Days Free—Send No Money So confident are we that Prof. Young and hig gros book will quic aly teach you the science of ypPactism, that we will send you a copy without one cent in advance! ek clip sod mail the coupon below. When the book arrives, pay the postman the special low price of $2.50 plus pow cents postage. Then test the powers of Hy notism 5 days! If not ‘amazed and delighted, return the book and mo: ney will be refunded at once! Mail the coupon now Franklin Pub. Co., Dept. W-70 800 N. Clark St. Chicago, Ill. ec ce cs ee ces cn es me ee ne Franklin Pub. Co., Dept. W-70 1 800 N. Clark St., Chicago, It, at a glance —How to Hypnotize By Telephone —How to Give an Entertainment —How to Make Others Obey You —How to Do Dozens of Hypnotic Feats send me your amazing new book—“The Sec lense a Hypnc xtism”—b Prof. Young. When the book ‘arrives, I'll pay the proton ale Gap pits | . If I am not satisfied after 5 days’ tial. I m - ‘return the book a you are to refund my money. l LEVERAGES DTD U OCS ieee sks su sd dees Tokwisdecade | DO. ow pcr ccncceccsccscccssececs Sta te If you are e likely to be ‘out when postman calls, send $2.50 with coupon and we'll Rad delivery charges. Customers outside U.S, must send cash with order | — POPULAR MECHANICS ADVERTISING SECTION '[ GUARANTEE An Inch of Solid Muscle All Over Your Body In 30 Days! CHARLES ATLAS—Winner of two $1000 FIRST PRIZES as the World’s Most Perfectly Developed Man, at Madison Square Gar- den, New York City. Ne ether living man can claim this title! Are You Ashamed of Your Figure? My system “Dynamic Tension” is what you need. Inside of 30 days I’m going to add at least an inch or more of solid muscle all over your body if you'll] give me a chance to prove it. I'll Make You a Muscular Giant in 90 Days LOOK AT THESE PUPILS— Here's con- vincing proof my pupils become tremen- dous, virile Herculean Giants, more mus- cular than many other physical instructors are. Regardless of your age I GUAR- ANTEE to give you marvelous quick-fight- ing muscles in record smashing time, and develop your nerve, courage, confidence and strength, too. READ THIS! Look at the picture of El Marquis de Guada- lupe. He's 53 years young! He attributes his rfect development to the CharlesA tlas Course, What I have done for the Marquis and thou- sands of others let me prove I can do for you! I'm waiting to give you New Health, Great Strength and a aaa Physique. So come on, fellows, let’s go EVERY PUPIL RECEIVES MY PERSONAL ATTENTION The lessons are prepered to suit the particular condition of each pupil FREE y “EVERLASTING HEALTH a AND STRENGTH” Write for this amazing Free Book full of Py @ ictures of men s neve, Gee ir all > Marquis de Guadalupe formation how to have health and strength. Mexico City Mail the coupon TODAY—NOW! CHARLES ATLAS “ World’s Foremost Muscular Scientist” Dept. 812, 171 Madison Ave., New York City Dear Sir; Please send me your Big FREE Book “* EVERLAST- ING HEALTH AND STRENGTH” by return mail, without cost or obligation, Name

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the are tle! 2? side POPULAR MECHANICS ADVERTISING SECTION 95 When Thomas Edison groped in the dark IN 1859 Edison was a newsboy on the trains in and out of Detroit. He spent every hour he could spare in the public library “grappling bravely with a certain section, an consecutively, shelf by shelf, regardless of subject.” Admirable determination! Edison was destined to’ be well read, just as he was destined to become the greatest inventor of all time.. But his early desire for fine reading was-a blind groping in the dark. The books in a modern public library would take fifty lifetimes to read! Now—Everyone Can Be Well Read Just as America’s great inventor brought light into the world through the great medium, electricity — America’s great educator brought light to everyone through the medium of good reading. Dr. Charles W. Eliot, from his lifetime of study, selected the pure gold from the world’s literature. Into a single set he assembled the essentials of a liberal education, the books that everyone must know to be well read. In the Five-Foot Shelf are the care- fully selected writings of 302 immortal authors. Dr. Eliot’s Pian of Reading FREE The Five-Foot Shelf is not a “rich man’s library.” By the famous Collier plan these wonderful books are brought within easy reach of everyone. Do not put off finding out more about this invaluable set. DR. ELIOT’S FIVE-FOOT SHELF OF BOOKS (The Harvard Classics) Carlyle once said, “If time is precious, no book that will not improve by repeated readings deserves to be read at all.”” Time nowadays is more precious than ever before. We cannot, like the young Edison, attack the countless shelves of public libraries. Probably none of us possesses the persistency and patience which guided his early reading. We must have only trying to read it through. the really great literature, the books that make us think straight, talk clearly and increase both our power to succeed and our enjoyment of life. The Harvard Classics answer these requirements to the last detail. Already they are read and cher- ished in thousands of cultured homes, They are constantly bringing keen enjoyment and deeper understanding into busy lives. “Reading,” as Edison himself says, ‘‘will never take the place of doing, but it enables us to travel twice as far with half the effort.” Mail the Coupon TODAY! P. F. COLLIER & SON CO. 250 Park Ave., New York City — | By mail, free, send me the booklet that tells all about the most famous library in the world, describing Dr. Eliot's Five- l Foot Shelf of Books (The Harvard Classics) and containing the | plan of reading recommended by Dr. Eliot. Also please advise how I may secure the books by small monthly payments.

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U. 8. Gov't asks 8S. of E. to F< jest this huge a Elec. generat- ing Unit, built for Panama Canal.

ey) oe Electrical gineering Electricity seeks men of action! Jobs up to $10,000 a year are open to men who have received special training such as is given in the School of Engineering of Mil- waukee—one of the foremost and best equipped Electrical schools in America. If you have 14 high school credits or equivalent, you can become an electrical engineer with Bachelor of Science degree. Lacking credits can be made up in our g, §. DEGREE IN short special course. 3 YEARS Complete, Practical Electrical Education Learn by the thorough, approved scientific methods which our 26 years of specializing enable us to give you. In addition to Electrical Sow ring, the following complete courses are given: A. C. and D. C. Armature Winding—Wiring and Testing —Commercial Electrical Engineering—Automotive Elec- tricity— Radio Sales Service and Broadcasting—Electrical Refrigeration. EARN WHILE YOU LEARN Cooperation with large Milwaukee Electrical industries enables us to help place students in part time jobs to help their way while learning. Low tuition. Board and room reasonable.

Daily broadcasting. School orchestra. Fraternities. Send Coupon for Free Catalog NEW TERM BEGINS NOW §CHODL -f ENGINEERING Iwaukee ——-F% OF ENGINEERING OF MILWAUKEE Dept. P. M. 1229A E. Wells & Jackson, Milwaukee, Wis. Without obligating me in any way please mail free illustrated book “ hire toSuccers H Through Electricity,” and particulars regarding the course I have marked with an X. | | RESIDENT COURSES + -Moctwiont @ incoriag. 8. Ss. Sore: (3 Years) Armature Wind: P A Motor wire ight ye in and and Testing.

1 yr.— others 1}; yrs.)

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POPULAR MECHANICS ADVERTISING SECTION —IN 90 DAYS: Play anything —jazz to classical! Even if you know nething about piano music— I'll have your fingers dancing over the keyboard with cen- y If you a or students are money. Without puzzling notes! Without racticing tedious scales! I've ound the way to bring out your musical instinct. New and original system does away with ¥ ru send it. Write me now. LLInOIs SCHOOL OF MUSIC 1801 Byron, Dept. 115, Chicago, Iii.

Be a MEAT CUTTER Make up to $60.00 and more every week ; steady jobs ever yw here—people musteat Manage a market. Get a big profit store of your own. Weteach you quickly through our easy. simple Home-Instruction course This & golden opportunity for u—grasp it. Write P. —y ‘or FREE boo “Big Pay the NATIONAL Way.” National School of Meat Cutting, Inc. Dept. E Toledo, Ohio

BART’S NEW CHALK TALK BOOK ‘Their Best Stunts” from 25 chalk talk experienced artists. $1.25 repaid, 5-day trial. Also catalog “A,”’ Art Supplies, or “S,” Show Card Supplies. BART SUPPLIES, 525 Eustis Bidg., Minneapolis, Minn.

BREAKFAST NOOK 332 2° other splendid articles of Built-In Furniture in our new book on this euhiost. 198 pages Illustrated. Price $2.50 Postpaid. POPULAR MECHANICS PRESS, 200 E. Ontario St, Chicago

Are You Interested in Flying? No matter what you want to know about this subject, send for our free catalog of aviation books. It is the latest and most complete pub- lished. A post card brings it. Popular Mechanics Press, 200 E. Ontario St. Ch icago

Oh, You Skinny! Don’t be laughed at for your lack of flesh and muscle. Don't be an object of ridicule wherever you go, at the dances, in the swimming pool or on the field of sport—don't let them call you “Skinny.” Don't suffer this humiliation. You can turn it to admiration by the simple method of letting Lionel Strongfort, the world’s fore- most physical instructor, take hold of you and build you up through Strongfortism, into a real he-man—with a body to be proud of. Away with weakness. In less time than you think you-will rid yourself of vitality sapping ailments and be admired and respected for your fine physique and robust physical powers Come on—be a manly man. Just write for my illustrated book giving priceless secrets about the human body. Send the coupon today. STRONGFORT INSTITUTE LIONEL STRONGFORT. DIRECTOR, STRONGFORT PUVSICAL AN 4 SPECIALIS ee Se NEWARK. NEW JERSEY, U.S.A.

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AVIATION TrainingF REE of extra cost Coupon brings full de- tails of complete Avi- ation Training, | am offering FREE of ex- tra charge. Send it now. d 0 D pen 1 ad h i J i de ained me . > % 00 m i V DO D 0 oto n 0 plendid o 0 a now amb oto n 4 oupon b Send - : on nd proo od ' 4 » u 7 0 ng 0 GINEI 7 e am 4 Gress

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iDrawing .««the First Step Toward a Good Job in Drafting ... Building .. . Architecture The fine positions = and big salaries paid in Drafting, Building Construction and Architectural lines, are leading many men to ask how they can “‘break in. The sensible way is to learn Mechani- cal Drawing, which every man must know before he can become a Draftsman, or take charge of construction jobs. You can easily learn Mechanical Drawing at home in spare time—then you can get a job with some Contractor or Architect and cash in on it, while gain- ing valuable practical experience. Later et rr cap tackle building superin- t architectural drafting, or con- tracts, cxtsmates and specifications or some one other braach of the work. The new idea is to learn one “‘unit’’ of the work at a time, as you need it for promotion, and then make that training pay for itself before you take another. We'd like to tell you more about this new “one-step-at-a-time’’ method of training for a better job and a raise, lower in cost and uicker in time than “complete courses.’ ust mail coupon for free unit plan book. AMERICAN SCHOOL _Dept.t D-947, D Drexel Ave. &5 58th a St., Chicago American School, ‘Dase. “D- "947, Drexel An. ©. & 58th ‘St. ., Chicago I am interested in the new quick way to get into Drafting, Contracting, Architecture, etc., by starting with mechanical draw- Please send Free Unit Plan Book and complete information. POPULAR MECHANICS ADVERTISING SECTION Would YOU Like To Get Into Municipal Air Port, Kansas City, Mo. ow To Secure A Government Position Why worry about strikes, layoffs, hard times? Get a Government eae In- creased salaries, steady work, trave — ay. I'll help you become a Goueaun touse Clerk, Railway Postal Clerk, Post Office Clerk, City Mail Carrier, Rural Carrier—or any other Govern- ment job you want. I was a Secretary- Examiner of Civil Service Commission for 8 years. Have helped thousands. Now FREE My 32-page book tells about the jobs open— and how I can hel you get one. Write Py ARTHUR R. PA RSON, Civil Service Expert, PATTERSON SCHOOL,812 Wisner Building. Rochester. N.Y. FREE Book CATALOG | Send today, without obligation, for our new 72 page catalog, de- scribing books on more than one nundred and fifty practical and scientific subjects, including books on Aviation, Automobiles, Air Brakes, Alloys, Electricity, ne Heatin Hydraulics, Model Making, Metallurgy, Rad 0, Ship Models, Soaps, Per- fumes, Recipes, Plumbing, a. ¥, Tanning, Television, etc. Norman V. Henley Publishing Co., 2 West 45th St., New York, N. Y. The man who studies gets ahead. Popular Mechanics Press will — — what books to read to advance in your trade. East Ontario Street, Chicago, Illinois. Ay up-to-the-minute instruction make it e a of the rse and what National DRAW CARTOONS Cartoonists earn from $50 to $250 per week—some even more. System of Drawing teaches you in balf the usual time. world are enrolling for this exceptional instruction. asy Send for interesting BOOKLET and SAMPLE LESSON ~~ ~ explaining full details TURN YOUR TALENT INTO MONEY Remarkable Circle Students from all parts of the Personal criticism service and for National students to attain success. will call. are The National School of Cartooning, 623 Penton Bidg., p wobec Ohio WANT $1900 Railway Postal Clerks $2700 A YEAR U. S. Government Jobs Mail Coupon Before You Lose It oe ee ee eee es ee es es es FRANKLIN INSTITUTE, Dept. D175 Rochester, N. Y. a Sirs: Rush to me without charge—copy of 32-page book “How to get U. 8S. Government Jobs,” with list of posi oa tions obtainable and full particulars telling how to get them.

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ae eC — en POPULAR MECHANICS ADVERTISING SECTION Hock lectricity| . fea — 3 Need Electrically Trained Men These new Electrical industries are ping the world. This is the Elec- trical Age! Big manufacturers are pleading for Electrically-trained men. Sal- aries of $3,000 to $7,500 a year are common! Wonderful opportunities for advancement. Here is the field for you. Now is the time to start on the that leads to increased pay and SUCCESS! Train the Practical Way Theory or books alone can never make you a Practical Electro-technician. Our new Home , Cees esertany Method, with the patented Unit Board System brings the School right to your home. You learn by doing—by work- ing on full-sized equipment that is yours without extra cost. Behind your train- ing is a fully established college—not a mere correspondence school. Recog- nized by the U.S. Government. Established 26 years. Over 25,000 graduates holding important Electrical positions aJl over the world Earn as You Learn Cash in on your Electrical Training while you're learning. Many studenis report increased earnings, advancement, even while studying. Train in spare time at home. Employment Service renders FREE »'¢ for life. Lite. time Consultation Service. Many exclusive features avajiable nowhere else. Mail the coupon today for full parti EXTENSION DIVISION SCHOOL of ENGINEERING, MILWAUKEE, saber sci Aviation ‘Talking Movies, Radio, Super Power, Television, Refrigeration, Lighting Big Shop Laboratory Worth’60° without Extra Cost Exclusive Patented Laboratory Equipment Special Unit Board System makes fascinating sport labora- tory experiments. Amazingly easy to use, theoretical aay —but PRACTI- CAL tramng on full-sized motor, switchboard, cir- cuits, and eleo trical equipment. Satisfaction Guaranteed ing without risk- ing a penny. Guarantee Protects you. FREE 48-Page Book Send -Coupoh TODAY “Practical Elec- tricity—the Key to Suc- cess"—and full details of Extension Division Training. weeeeeee tor Mapated ae ee Pee reek) to ine teee....t-: ee hee ee Book Pa E = 3 3 t é Uae. ee ae

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100 POPULAR MECHANICS ADVERTISING SECTION The. AMERICAN RED RACER my) We a MONEY for YOU~in Earn $2,000 to $5,000 a Year or Have a Business of Your Own! Whether re want a job at good pay or a highly profitable business of your own—the Poultry Industry offers you more than any other. There's a shortage of poultry meat and eggs—a owe of trained ypeanyes. I'll train you quickly at home—to fill a good job in Poultry—and our FREE Students’ Employment Dept. will help you get one! 20” Wing Spread Here is a brand new development in a model plane for you—an endurance model. It has many novel features which give it entlurance and flying aualitien that you have never before experienced. It will sta: the air for a minute—a minute-and-a-half or more. ay is A rights weighs less than an ounce—and practically crash-proof, You can fly it again and aga: he American Red Racer t is easy to ee outfit being complete in every aunt, having all plans, parts, covering paper, motor, propeller and dope You can mplete it 8 quicki and marvel -“ the fights it will nit - for you. Ree« rds of 150 to 400 feet ha we been made. With a heavier motor you can get great speed FREE Book Shows Way to Spare Time or Full Time YOU Can Cash-in BIG Big Pay and BIG Profits No matter where youlive— Mail coupon below TODAY city, town or country—or -—for my Big NEW _ FREE what you do now, my _ Book, “How to Raise Poultry proved methods will assure for Profit.” My forty years your success right from the of experience are yours. The $2000 1 5.008 Ste te, ‘ip «Poultry Industry And, AF you choose to start your Sete SUN. Youneed usiness, " d distance. sake eee ee ee y book. Get it—and get “ spread is 20” and the fuselage is built uy; " P-_ measuring 14”. Avy itself Your thy investment multiply in ‘tine for the BIG M powerful, flexible, long-running, smooth motor, as we! ¥ pectal bearing i Fee nately othe Tens that’s waiting for you in pr : This plane will ty wonderfully hand maid os wilt i 0. ae cies call ULTRY, 2 perfect 3-point la: PO The price is low—remarkably low—for such a perfectly designed plane that has ’ oy will want lots A these American Racers for youre . It makes a wonderful gif rder yours right now—don’t let a day pass without getting the fun and ige struction that is in store for you Price postpaid complete only $1.00 or we will send 6 postpaid for $5.00. NATIONAL POULTRY et Dept. 411-D 7 Washington, D. C., Att'n: Harry M. Lamon, Pres. . sods from BI00 te S000 gies On gear orders ar cont fer ite Dear =a ee: pone me you: FREB Book, “How to Ratse © with free glider. Poultry for Profit.” Want to know more about my oppor- tunity to make $2000 to $5000 a year, spare or full time. : AMERICAN MODEL . 2 NS cacuinhhs tienen neiliecigis «vod as. sovindeneseeiniale AIRCRAFT COMPANY 7 ENE AE ee ‘ 4 Desk PIZ NEW HAVEN, CONN. . a LEARN CARTOONING AT HOME DURING SPARE TIME with the course that has trained HUNDREDS of beginners successfully. The Landon Picture Chart Method of teaching ORIGINAL drawing 4 mail makes cartooning easy to learn. This school is 1 Member of The National Home Study Council. Write today for sample picture chart to TEST YOUR ABILITY and examples of the work of Fear oy students now earning from gee to $200 and more per week. lose 6c in stamps and STATE YOUR A THE LANDON SCHOOL, 2838 National Bidg., Cleveland, Ohio a Census Clerks-FileClerks AT LAST! You can now learn to make PATENT DRAWINGS The taking of the 1930 Census means the appointment by HOME ST vey. Ps couse Sesine 76 u fo make drawings of many Government Census Clerks and File Clerks. Now mventions such as Shown in Fepular Mechanics and qual- is the time to get ready. Men—women 18 to 50. $1440 to Ry Se he Te , ah nt Attorneys—U- ine $2500 year. Full particulars and list Government Jobs— mechanical drawing. No mathematics. Send for booklets. FREE. Write today sure. Immediate action is necessary. U.S.School of Patent Drafting, 303 N. Parkside Ave., Chicago Franklin Institute, Dep’t D705, Rochester, N. Y. fia Money Quick Here’s An Easy Way! Begin Right Now! —to bring ycu a fine cash income! Thousands are making Fireside Without taking any time away decorations—making from hundreds from your job. Pleasant eas to thousands of dollars and doing y j asant easy their own work besides. We supply work at home. Decorate beauti- you with everything you nee Rig ful giftwares the Fireside way. Generous Complete Kit WIT HOUT You can do it — in spare c We EXTRA COST. It’s a cinch! moments. No previous training absolutely crys A he agree requifed. No_ special ability y . - F R E E! - Fireside Industries, neweee RR ong “ae ote, Me Sis cut ond enot i Dept. 66-W, Adrian, Mich. izing. 1th 1€ ree > - i Simple Steps sent you by Mon- coupon at once. Send me your wonderful Free Book in Without any ob- colors. Tais does not put me under any sieur Petit the great artist — ligation it brings obligation. Director of Fireside Industries, it ou wonderful is just fun! We want men in ireside Book in every community. Be the first! colors. Explains PUBMED. .cccnccccccccesteccevceeaesos Fireside Industries, 2er'. $6” everything. het maeel {Address Lack vance I don an ari —I de care i let lac

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i—_ ni Fe | . < ——_——

POPULAR MECHANICS ADVERTISING SECTION Amazing y Easy Way 101

to get into ELECTRICITY Don’t spend your life waiting for $5 raises, in a dull, hopeless job. Now « «. and forever ... say good-bye to 25 and 35 dollars a week. Let me show you how to qualify for jobs leading to salaries of $50, $60 and up, a week, in Electricity—-NOT by correspondence, but by an amazing way to teach, RIGHT HERE IN THE GREAT COYNE SHOPS. You be- come a practical Electrician in 90 days! easier than you imagine! Getting into Electricity is far Learn Without Lessons ix 9 xs Lack of experience—age, or ad- vanced education bars no one, rs I don’t care if you don’t know an armature from an air brake —I don’t expect you to! I don’t care if you're 16 years old or 48 —it makes no difference! Don’t let lack of money stop you. Most of the men at Coyne have no more money than you bave. Railroad Fare ~Allowed I will allow your railroad fare to Chicago, and if you should need part-time work I'll assist you to it. Then, in 12 brief weeks in the great roaring shops of Coyne, I train you as you never dreamed you could

Here are a few of +~— of positions open to Coyn trained men. Sorivcoemaier- ment bureau gives you life- . time = loyment service. be trained... on the greatest Arma: ure Expert 8g w ry a eek outlay of electrical apparatus §f curstation Operstor ever assembled . . . costing hun- a Week and p dreds of thousands of dollars... Jf Auto Electrician . $110 a Wee . mventor ... . . Unlimi real dynamos, engines, power Maintenance Engin plants, autos, switchboards, to $is0 @ Week Service Station wn transmitting stations...every- Yo $200 a Week i Radio Expert up to 100 « Week thing from doorbells to farm

power and lighting...full-sized -.. in full operation every day!

Nobooks,no bafflingcharts = . all real .“r work... right here in the great Coyne school... building real batteries... winding; real armatures, operatin real motors, dynamos and generators, wiring houses

Every fence! NOW IN OUR NEW HOME This is our new fireproof, modern home wherein is in- jars equipment o nem av we the largest amo pace devoted to th exclusive tes teaching of prac- tical electricity in the world. comfort and conven- all kinds. bas emais Jou bs happy and con- your train etc., etc. That’s a glimpse of how we make you a practical electrician in 90 days, teaching you far more than the average ordinary electrician ever knows and fitting you to step into jobs leading to big pay immediately after graduation. Here, in this world-famous Parent school —and nowhere else in the world —can you get such training! Jobs, Pay, Future m’t worry about a job, Coyne training settles the jobquestion for life. Demand for Coyne men often exceeds the supply. Our employment bureau gives you a lifetimeservice. Two weeks aft- = graduation Clyde F. Hart got tion as electrician for the Great Western Railroad at over $100a week. That's not unusual. Wecanpoint toCoynemen mak- ing up to $600 a month. $60 a week is only the beginning of our opportunity. You can go nto radio, battery, or automo- SS businessfor your-

fandmakeupto$15,000ayear. I Coyne Eiectrs Dear Mr. Lewis: ment Service, ed to : Name. COYNE ie ote _— 500 S. Paulina Street, Dept. 99-72C » Chicago, Hl. ® city............... eee ee eee eeeeeeeere Get the Facts Coyne is your one great chance to getintoelectricity. Every ob- stacle is removed. This school is 80 years old—Coyne training is tested—proven beyondalldoubt —endorsed by many large elec- trical concerns. Youcan find out everything absolutely free. Simply mail the upen! and let me send you the big, 3 we yne book of 150 pho- tographs ... facts... jobs... .sa- aries ... : opportunities. Tells you how many earn expenses whiletrain- ng and how we assist our graduates n the field. This does not obligate you. Soactatonce. Justmail coupon. Get This Free Book \

| ae agtageeye omg ti vee Electrical cal School, Dept. 99-72C sae S. Paulina Street, Chicago, Illinois Without obligation send me your big free catalog and fan details of Esilroad Radio, | motive Courses, and how I can oad Fare to Chicago. Free Employ- Aviaton Electricity, and uto- ‘earn while learning.’’ eee ee eee eeeeeee

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102 POPULAR MECHANICS ADVERTISING SECTION STEAM ENGINE

Here’s our special “Little Hercules” Steam Engine. Made by “Weeden,” world’s leading maker. Fine quality and high finish. Has heavy fiy-wheel, pulley-wheel, easy acting piston, and heavy cylinder. Strong boiler and fittings. Has fire box. Runs by alcohol or canned heat. Will run mechanical toys like Erector, Meccano. A big, high quality steam engine—powerful —just what you have been wait- ing for and you can have it FREE. The Magazine of Thrills The Open Road for Boys magazine has fifty pages crammed with thrilling, breath- taking stories that will hold you spell-bound. Tense stories of high adventure on land, on sea and in the air. Deep mystery. \ Suspense. ‘“‘The Street of = Dreadful Silence,’’ the most a thrilling mystery serial smash ‘ in ten years, now starting. S Regular subscription price alone $1.00 a year. We'll send you z Open for Boys ° Magazine for = a whole year 35 for $1.00 and yt this dandy steam engine = FREE! 3 Wow! What I a bargain. E BOTH

Canadian tage 25c extra. Foreign 50c extra. The Open Road for Boys Department W-86 130 Newbury Street Boston, Mass. You bet I'll grab that bargain. Here’s my $1.00. ush the Steam Engine right out to me and put me down for a year’s subscription to The Open Road for Boys Magazine.

ay TURN THIS DIAL and make $20.00 OVERNIGHT RIGHT IN YOUR OWN HOME! You simply turn the switch with a full set of batteries on the table, and make $20 to $40 overnight. Ralph Baron Miranda makes $125.00 a week charging batteries. Proesel makes $150 a week, after starting in a small way. You can, too, under my plan. Pocket 90c Clear Profit on Every Battery I have invented a new Service Station Charger which saves 40% to 60% in electric current, yet handles 50% to 70% more batteries than similar outfits. Millions and millions of batteries in daily use by auto owners every- where. Amazing new principle of my Service Station Charger simply scoops up all the business in town for you. s Starts ¢ No Special Ex lence 5.00 You * orEducation uired You start making money as soon as charger is unpcrated, using either full or spare time. Charger is automatic and requires no attention during ——. Profits go into Ly 2 ket without <= effort on your ollars starts you. We ship complete outfit on receipt of $5.00. O55 Bost for Tools, and Extra Equipment “You are the best Incluéed Without Charge , As an owner of my charger you get the benefit ‘* ow bringing me in of my advertising. When you open up, business plenty of money, with comes = to your door. No soliciting—no practically no effort.” luge or i b

oe rm Py Customers are glad to give you FREE Book Tells How to Start! Full or Spare Time

Clip oougen and get your Free copy of my 900k, “Big Profits."" Read how hundreds

FEA “ ma lished themselves in their own business. m\ See the description of my amazing Serv- - ice Station Charger. Find out about f\ my plan for establishing you in this Big; Pay field. Clip the coupon now! Address Me Personally \)c. F. HOLMES, Chief Eng. Independent Electric Works Dept. H 4912 N. Clark +. Chicago, Ill. ee ee ee SS C. F. Holmes, 4912 N, Clark St., Dept. H, Chicago, Ill. Rush me by return mail a copy of your Free Book “Big Profits.”

WIRED. 0.0.06 cb Recedtecccascsccccsesesccecescocacccccceseooses

. er -_ -

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wrreer POPULAR MECHANICS ADVERTISING SECTION 113 Three different size screw-drivers in one. Dealers are ready To bore holes for screws, a man needs a “Yankee” Automatic Push Drill No. 41—with eight sizes of i ntemee Lg" to /e". Price, $2.60. — (t=) “Yankee” No. 15—a ratchet driver, has thumb-turn on blade for starting wabbly little screws with thumb and forefinger. Price (4 in. blade), 80c. No. 90 is a husky “Yankee” plain screw-driver that stands all sorts of use and abuse. Price (8 in. blade), 75c. The finest tool on earth of its kind is “Yankee” Ratchet Bit Brace No. 2100, Price (10 in.), $8.20. Lucky man, who gets a “Yankee” Bit Brace. MEN take pride in owner- ship of “Yankee” Tools! Ingenious . . . interesting! Give a man—or boy—a “Yankee” Tool and you have made a fine gift. Your fiatee” Se. 1800 Ran =, hardware man is expert in knowing Drill (above). and No. 1555 Ratchet what tools to give a mechanic; what Breast Drill are fine gifts for motorists. These drills have five ratchet adjust- tools the handyman wants for the ments; they work where others can’t. P N 1530, $5.25; No. 1555 c Price:” No. 5.25; No. 1555, home workshop. “Yankee” Tool Set No. 105 — ratchet tool holder with nine attachments For the man who Every man wants this “Yankee” Spiral Ratchet Screw-driver No. 30-A. Drives all sizes of screws, Sadhome ‘ae, Yaad —— quick and easy—simply by pushing . wa = es on the handle. Price, $3.00. Three sizes of bits included. _ YANKEE’ TOOLS MAKE BETTER MECHANICS ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee eee ee ee ee ee ee ee ee ee NORTH BROS. _—s CO., Lehigh Avenue, Philadelphia, U. S. Reade ts of Popular a who like to own good tools, are invited to se nd this coupon for “Yankee” Tool Book (free) illustrated with action pictures of “Yankee” Tools in use, showing how these ingenious tools save time and labor

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114 POPULAR MECHANICS ADVERTISING SECTION Own a car your friends can admire OU needn’t envy your friend’s fine car — or be ashamed of your own — when you can buy a fine quality motor car for little money. Many good used cars have their original beauty, style and distinc- tion, with thousands of unused miles. Pledge to the Public on Used Car Sales 1 Every used car is conspicuously marked with its lowest price in plain figures, and that price, just as the price of our new cars, is rigidly maintained. 2 All Studebaker automobiles which are sold as CERTIFIED CARS have been properly reconditioned, and carry a 30-day guarantee for replacement of defective parts and free service on ad- justments. Every purchaser of a used car may drive it for five days, and then, if not satishied for any reason, turn it back and apply the money paid as a credit on the purchase of any other car in stock—new or used. (It is assumed that the car has not been damaged in the meantime.) © 1928 The Studebaker Corporation of America STUDEBAKER Builder of Champions And you can buy a really fine used car for the price of a cheap new car. By buying your used car under the terms of the famous Studebaker Pledge, you get positive satisfaction-insurance. The Pledge gives you five days driving trial with any used car you se- lect. You get a 30-day guarantee on all Certified cars. And all prices are plainly marked—there are no code priceson a Pledge-backed used car. This free booklet, “How to Judge a Used Car,” willteach youmany _ __ fine points about used car li — buying. The Studebaker Pledge will thoroughly J protect your motor car ‘ investment. Act now to J give your family a bet- ter car — mail the coupon today! THE STUDEBAKER CORPORATION OF AMERICA Dept. 1512, South Bend, Indiana Please send me copy of “How to Judge a Used Car” di ei

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POPULAR MECHANICS ADVERTISING SECTION 115 How to File Circular Saws Told by the World’s Foremost Makers of Saws iia aus ant tienines die snide DP #sTON Circular Saws, and all other Disston Saws, are made of Disston Steel, from Disston’s own steel furnaces. This steel, and the skill of Disston craftsmen, made Disston the world’s foremost saw makers. You want Disston Steel in your circular saw. There is no substitute for it. This steel takes and holds a keener cutting edge; cuts easier, and stayssharp longer. In great lumber mills, Disston Circular Saws are standard equipment. You will find that you, too, can do better work if you use only Disston Saws in your home workshop. Ask for Disston! Circular Saws and Band Saws, Hand Saws, Hack Saws, and Files. Files for the Wood Worker Disston Cabinet Files (fine teeth) for smoothing and finishing w surfaces, easing tight doors and drawers, etc. Disston Rasps (coarse teeth) for rough and fast cutting, enlarging holes, etc. Half-round 8” Cabinet File, 65c. Flat 8” Wood Rasp, 50c. Handiest of Pocket Levels For truing up construction work, levelling shelves, etc., use @& ton Featherweight Pocket Level. The lightest and handiest level made. Length, 9”; weight, 20z. Aeroplane aluminum. Three proved glasses. $1.25 For Cutting Dovetails, etc. Wherever the finest possible joint is needed, and for dovetailing, pattern making, eétc., se Disston No. 68 Dovetail Saw. Blade extra thin, wjth fine teeth. The 8” biade, 17 ints to inch, is most popular. $1.60. A Disston Circular Saw ona Portable Bench Machine Te sharpen small circular saws, you need a filing clamp or vise; the proper files, and a saw set, or an anvil and hammer, to spring the teeth. The Disston No. 7 Circular Saw Filing Vise is handiest, taking saws from 4” to 16”. On cross-cut and combination saws, use Disston Taper Files, 6” or 7”; on circular rip saws use Disston Mill Files, 6” or 7”, with one round edge. First joint the saw, getting all teeth same length. Turn saw backward by hand on mandrel, holding emery stone lightly against tops of teeth until all are touched. Then put saw in vise and set the teeth, using a Disston No. 18 Tri- umph Saw Set (Illustrated; $1.50). Be careful not to carry the set down too far on the teeth. Follow the original set of your saw. Note that one tooth is set to right and the next to left. Next file the teeth as near to their original shape as pos- sible. Keep all gullets of same depth and width. Bevel teeth alternately, following original angles. In filing, do not reduce length of teeth: simply wary them up to a sharp point. Bevel on both face and back should be about one-third the length of the teeth. On a combination novelty saw, which cross-cuts, rips, and miters, do not set the raker teeth; set only the scoring teeth. No teeth of a hollow-ground combination saw should be set. Do not bevel raker or cleaner teeth, but file them straight through. Your hardware dealer has in stock, or can get for you quickly, Disston Circular Saws for any machine. DISSTON Makers of “THE SAW MOST CARPENTERS USE” “The Saw Most Carpenters Use” The two handiest saws for the home work-shop are the 26-inch 8-point for cross-cutting, and the 26-inch 5%-point for ripping. pi] y~] =," these on almost ery job. © popular **D-8”" Lightweights cost $3.45. Many other styles and sizes available. Band Saws for Better Work Disston “Thin Gauge” Narrow Band Saws are 2 to 3 gauges thinner. They run better on machines with wheels up to 26” diameter. Saw 9 8” long, 4” wide, 25-gauge, brazed, $2.03. Other sizes in proportion. Disston Combination Saw This type of Circular Saw, known as a Combination Novelty Saw. does cross-cutting, ripping. and mitering equally well. It is made either flat ground for general work or hollow ground for smoother cutting. lew “‘Disston Small Circular Saws and How to Use| Them” is a new bulletin which tells how to operate and refit saws. It will be of interest and value to every owner or prospective owner of a small electric bench saw outfit. The coupon will bring it to you. Henry Disston & Sons, Inc., Philadelphia, U. 8. A. (In Canada, address Henry Disston & Sons, Ltd., Toronto) Please send Bulletin on Circular Saws, and other data. a Name and Address

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116 POPULAR MECHANICS ADVERTISING SECTION How to be Gonna to a man at Christmas

EE how does the Gillette Fifty Box qualify as the ideal Christmas gift for a man? Here’s how—on these eight counts : It is practical... Man, famous for his practical mind, insists on useful gifts. Yet he probably wouldn’t buy this for himself... From long habit, he is used to getting his blades in packs of five and ten. This will be a new and refreshing idea for him. He'll be sure to use it... Blades are a daily necessity in every man’s life. The Gillette Fifty Box is the most convenient way to have them. It is personal ... It’s all to himself, for his Own intimate, bathroom use. Itis good looking ... Packed, as you see, ina Give him shaving comfort in abundance with the famous Fifty Box of Gillette Blades metal box, velvet lined, with a spring-hinge cov- er. Blades are enclosed in brilliant Cellophane. It is truly generous... With fifty smooth, double-edged Gillette Blades in easy grasp, a man can look forward to more continuous —— comfort than he has probably ever enjoyed before in his life. It will last well beyond the Christmas season ... For months his mornings will be free from all thought of buying Gillette Blades. It is reasonable in price ... Five dollars buys this édeal gift. On sale everywhere. Gillette

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POPULAR MECHANICS ADVERTISING SECTION 117 XmasGifts J Smart-Modern . fe UAa4a\oc | Tes S tea a DT28-Gor- 10 DAYS’ PS: nt fing of 18K Gold geously” hand FREE TRIAL ae blue-white diamond | engagement i ring set with atl 18K Solid sparkling, genuine ite Gold “Bridal pieg-whise dia- Blossom" wedding ond. $4.08 a mo. ring; 5 genuine Ghes-whise aiamonde. $2.37 a mo. 0T23-Modern, sq ng, meng ring in new zy mony : 2 Solid White Gold set eee: meaive, with special 4K Solid Green Go esamae: = enuine and fa cmt nota Gold with Guaranteéd Savings DT 31« Direct Diamond “thee od and Nationally known ELGIN or —— large volume buying for both our National THAM! Handsomely engraved ne Mall Order business and our Chain Store style case. Guaranteed Ligin or Wale system enable us to offer you superior tham movement. Wossences 14K quality genuine diamonds, fine standard White or Green Gold filled 25-year watches and exquisite jewelry at saving case. Latest style flexible mesh wrist prices which are beyond comparison. band to match. $2.21 a mo. Ail of this with no extra charge for the added convenience and advantage of digni: fied, liberal credit. ‘DTS-Diamord » wen watch. 14K Solid White Gold engraved case; 2 genuine diamonds, 8 emeralds or sapphires. ea me 15-jJewel movement. with sapphires or ae to match. $3.04 a month. How to Order Just send $1.00 with your order and your selection comes to you on 10 Days’ Free Trial. No C.O.D. to pay on arrival. After full examination and free trial, pay balance in 12 equal monthly payments. Satis y- faction Guaran 10 Days’ Free Trial e yey = 2 the full pavenee of aor free trial— not comp! y satis return . . shipment at our expense and the entire OT9-The “Prac ~ ’ deposit will be refunded. Written guar- quarevél eine, eB D, OT22-Gentleman’s mas- antee bond with every purchase. 15-jewel movement. En- sive, hand engraved ring All Dealings Strictly Confidential graved genuine “Wrista- us oo ae : hite Gold A whole year to pay! No extra charge—no erat’ Sexibe beacetet to red tape ou take no risk—satisfaction match. $1.96 a month. cr with a genuine diamond absolutely guaranteed or money back. and any carved initial or Gift Cases Free emblem desired. $2.21.mo. 3 very article comes to you in a most beau- as iful and appropriate presentation case. be Send S. for this CATALO GL E: Tera ra, _ Ts our C FREE Xiuns — Completely illus- trated new cata- log of genuine dia- monds; Bulova, Elgin, Waltham, Hamilton, How- ard, Illinois watches; fine jewelry and sil- DTS - Nationally ad- - verware at yertised- guaranteed apectal prtecs. OT19-Nationally known 15-jewel J WALTHAM Spreaen: Fe ane warranted engrav ite ades White Gold filled d case, RES ABLISHED 1895 12 size, thin “dust-tite” protector; \ Gold filled, Sees ROYAL DIAMOND “Water Co. Bee wrist band to match. . Address Dept. 11-Z, 170 Broadway. New York chain. All complete in hand- some gift case. $2.21 a mo $2.39 a mo.*

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118 POPULAR MECHANICS ADVERTISING SECTION Ends Blade Expense \Yesuchucte NYototts fically Correct - Mechanically Perfect i cominore knows that a safety razor maker could afford to g've away the holder and grow rich on the profits from blades. from even the best blade. Because one good and one or two indifferent shaves are Most men have to use a new blade every day. all that you can expect At cut rate prices for blades this amounts to $25.19 a year. If you get two shaves from a blade you pay $12.60 a year for new blades; and for three shaves your yearly blade bill comes to $8.40; and you don’t get “head barber” shaves. Scientific Invention Ends Blade Expense There has never been a device for Gillette type blades like the GRECO Sharpener. It actually lets you get better shaves all year from ONE blade than you would get from 365 new blades. = You know that the only way to Id make It to ¥o sharpen an edged tool is to use a a Sinclair STONE. . . a Grindstone, a Whet- lien one: cite ap Oe ee or Bert A. Sinclair, Sales Director 4 The GRECO DISTRIBUTING COMPANY 91 Warren St., New York, N. Y. I'll try the GRECO Sharpener for 30 days. If it doesn’t give me the clean, cool, close, quick shaves that I expect I I'll return it in good condition and you'll return my $5, sent herewith. | Accept My 30 DAY FREE TRIAL OFFER end today for a GRECO Sharpener; use it in your own home for days. I Guarantee that you will be delight- = A. gy renot, nee re- the SHARPENER in good condition and I'll re- turn your money witb- out argument. It I of a er offer If interested in Agency offer check below: Full Time 0 oun gn en an en enén op ae Ghanan es daab a Ce ee SER eT me ee ae Or Z ~ =| @ Spare Time 0 stone or a Hone, depending on the kind of edge to be sharpened. You know that a razor needs to be honed when itis dull. That's just exactly what theG RECO Sharpener does. With a few quick strokes it HONES a Gillette type blade on a special Pike hone to form NEW cutting edges . and then, on fine shell jeather, STROPS the new edges to shaving keenness. It does this to both sides of both edges automatically without removing the blade from the carriage. Beautiful, —> . lightning quick; not ing to get out of order or rust. Precision built of heavy bronze-brass, fully plated Read What a Few Users Say H. 8. W. writes: “I have used but 3 blades in 18 months since I got your GRECO Sharpener. One blade cracked and my wife used the other to scrape paint off the window or would have used buttwo. I formerly Saat a new blade every other L. said: “Jn the 7 ‘months that I have had your GRECO Sharpener I have used but one blade a expect to use it forever if it retains its temper.”” D. M. B. tells you: “I have tried almost every blade sharpening device; the GRECO Sharp- ener, which both hones and strops the blade, is the only one which really does the work properly.” Your MoneyBack If You Want It If the GRECO Sharpener will do for YOU what it does for others you want it. For it pays for itself every six months in the blades it shaves as well. So I want to send you one... on 30 days FREE trial. If you don't like it, return the GRECO Sharpeaer in good condition and I'll send back every cent you paid. For I'd rather have your good will than your money, if you're dissatisfied But you won't be. So Ce the coupon, pin your chec or a $5. bill to it and mail it to me today. BERT A. SINCLAIR, Sales Director THE GRECO DISTRIBUTING COMPANY 91 Warren Street NEW YORK, N. Y. oo

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y rich xpect lades ades; rmerly y other In the ve had ener I de and r if it D. M. e tried pening Sharp- es and e only es the lack It rpener hat it ant it. every udes it better mail it ANY N.Y, POPULAR MECHANICS ADVERTISING SECTION 119 LOOKING INSIDE A CLOSED CYLINDER The Midgley Indicator Knocks out that “*knock’* GASOLINE _ famous Midgley Indicator was devised to enable the scientists in General Motors’ Research Laboratories to look inside the closed cylinder of a gasoline engine. The indicator is an ingenious and sensitive mechanism which records the pressure inside the cylinder while the engine is running. By study- ing these pressures the scientists found out ex- actly what caused an engine to “knock.” Gasoline, even the best, they found, explodes too fast when compressed beyond certain limits. So they developed Ethyl fluid, which controls the combustion rate under increased pressures. Today Ethyl Gasoline—good gasoline to which Ethyl fluid has been added—has created a new standard of motoring efficiency and com- fort. It has made possible the new so-called “high-compression” cars, and it improves the performance of older cars. Try Ethyl in your car. Ethyl Gasoline Corporation, 25 Broadway, New York City; 56 Church Street, Toronto, Can.; 36 Queen Anne’s Gate, London, England,

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POPULAR MECHANICS ADVERTISING SECTION of New Model South Bend Lathes for the Manufacturing Plant Tool Room Machine Shop Service Station Electrical Shop Engineering Shop Laboratory Marine Shop Airport Machine Shop General Repair Shop and All Classes of Preci- sion Screw Cutting and Machine Work. Le WA Wiens 16’'x6’ Quick Change Gear New yes South Bend Lathe........7... $598 Prices of Popular Sizes of Quick Change Gear Lathes with Lathe Equipment Size of Shipping Countershaft Silent Chain Lathe Weight Drive i tae tise $5 8 it, 4 Ss. -00 A Few Recent 13'x5’ 1110 Ibs. $443.00 Purehasers 15"’x6’ 1550 Ibs. $543.00 16"’x8’ 2035 ibs. $638.00 Standard Oil Company Pennsylvania Railroad Co. * Eastman Kodak Company Dohler Die Casting Company Frigidaire, Inc. General Electric Company Commandaire, Inc. Fokker Airplane Company Victor X-Ray Company Cadillac Motor Car Company Formica Insulation Co. Raypheon Man. Company White Truck Company General Motors Corporation Victor Adding Machine Co. Nicholson File Company U. S. Government Western Electric Company Kohler of Kohler —used in 78 countries 18’x8’ Quick Change Gear Silent onan Motor Driven Lathe....... $1049.0 The South Bend Lathe Works is represented by machinery dealers and importers throughout the world, who carry South Bend Lathes in stock. 96 Sizes and Types | , nD

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The New Model South Bend Lathe is a back geared, screw cutting engine lathe with improvements and new features that make it | the most remarkable lathe value in the world. It is practical for handling the finest and most | accurate work coming up in the “4 modern plant and shop. a i Easy Payments as Low as $11.41 a Month Our Easy Payment Plan allows you to install a South Bend Lathe by making one payment with the order the balance to be paid month by month the amoum de- es pending on the size of the lathe you select Write for Cocstea No 90P which describes th sy Payment Plan os wa New Model Junior Other 9-inch Junior Lathes The Prices include Lathe Equipment | | | / G12 E. Madison St. SOUTH BEND. IND.. U. Ss. A. POPULAR MECHANICS ADVERTISING SECTION 9 'x¥ New Model Junior Horizontal Png Driven Bench Lathe complete.......... gi! x 3! South Bend Bench Lathe $169 with Countershaft and Equipment Weight 375 Ibs. Size of. Shipping Countershaft Horizontal Motor Drive Lathe eig Drive Motor Drive Without Motor 9’ x2\,’ 350 Ibs. $163.00 $248.00 $165.00 9x3’ 375 Ibs. $169.00 $254.00 $171.00 o"' x3’ 400 Ibs. $175.00 $260.00 $177.00 9” x4’ 425 Ibs. $182.00 $267.00 $184.00 | 9x4,’ 450 Ibs. $190.00 $275.00 $192.00 SOUTH BEND LATHE WORKS Mee. # New General Catalog No. 90A just out illustrates and de- scribes the 96 sizes and types of New Model South Bend Lathes from 9” swing to 18” swing. Write for this free catalog men- tioning size of lathe in which you are interested and 16 page Bulletin will also be sent de- scribing lathe in detail. Free Catalog are = Write ”

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ooh Na 122 POPULAR MECHANICS ADVERTISING SECTION Body by Fisher

and you’ll readily see why the Pontiac Big Six is mechanically the greatest value in its field If you are interested in the “‘works” of a fine automobile, we promise you a real thrill when you lift the hood of the Pontiac Big Six. For there you'll seé€ the “‘inside story”’ of why Pontiac is acknowledged the greatest motor car value at its price ... . Greatest for Power—200 cubic inch ‘piston displacement, large L-head engine developing 60 brake horsepower at moder- ate engine speed—more power with less wear and strain. Greatest for Speed—Ahead of any- thing in its class—proved by the “‘fifth wheel,”’ the most accurate speed measur- ing device known to automotive engineers. Greatest for Snap—Gets away like a dart—swiftest acceleration of any low- priced six—again proved by the ‘“‘fifth wheel.”’ Greatest for Safety—Scelf-energizing internal-expanding four-wheel brakes— noiseless, unaffected by weather. Full tread axles—front and rear. Rugged hardwood- and-steel bodies by Fisher. Foot-controlled headlights, dimmed or brightened while both hands are free to guide the wheel.

“®) BIG SIX RooDuwuUcC Greatest for Durability — Prolonged top performance and longer life due to ms ressure positive lubrication at all s—crankcase ventilation preventing dilution of oil— Harmonic Balancer elime- inating torsional vibration—non-squeak brake bands often good for 30,000 miles— Cross-flow Radiator with automatic tem- perature control—no watching, no over- heating. Greatest for Economy—Low first cost, thrifty operation, high resale value. Of 996 cars of 33 makes operated in 1928 by one large corporation, Pontiac cost one cent less per mile than any other low- priced six used! In addition, Pontiac’s long, low lines, its smart chrome plating, refreshing Duco color combinations and roomy, luxurious bodies by Fisher supply the finishing touches that mean greatest satisfaction, comfort and convenience for every dollar invested. See your nearest dealer, drive the Pontiac. You'll be amazed at how easily you can own this leader of low-priced sixes. Pontiac Big Six, $745 to $895, f. 0. b. Pontiac, Mich., plus delivery charges. OAKLAND MOTOR CAR CO., PONTIAC, MICH. GENERAL

MOTORS

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bes POPULAR MECHANICS ADVERTISING SECTION 123 “Hello boys / Tell ‘em you built it with GILBER]T @ig-Boy Tools BOYS, here’s your chance to give Mother and Dad the surprise of their lives! Build furniture, airplanes, toys, bird houses, and hundreds of other practical things. Tell Dad you’ll start right in as soon as you get your. Big Boy Set. Lift the lid of one of my big red brass- bound tool chests and you open up a whole new world of exciting thrills. Call in your pals. Oh, Boy! How their eyes will pop! Boy Builder’s Plan Book tells exactly how each job is done. And there’s a tool for every purpose. Find out right away how smart you are with your hands. Look over my Big Boy Tool Chests and & machine shop outfits at any good store. Pick out AC. our set and start right in . iiding wonderfulthings. When You Buy Your Tool Chest See that you get these eee ee —_ | J _%e __LET’S GO: : y . GILBER ys, want to make thin ‘RBid- F hum? My brand new Motor- BOYS! A. C, Gilbert's Rig ay, a Gates Driven Machine Shop is the This big (No.780)isthe Free Plan DAD’S SIZE greatest thing I’ve made for treasured possession of Book HOUSEHOLD TREASURE CHEST No. 780. boys since I invented Erector. thousands of red-blood- ga ¢5,- voureo ie-lnch cross cut saw and 7% inch plane. A A complete scientific work ed boys. They wouldn’t of my Plan Bock, iS in ese Ean ee nd cae shop— a combination portable swap it fora million dol- which tellshow to —_, rst Nanton so tnt THE MASTER CARPENTER SET No. 785, Practical selected high grade tools. lathe, demountable drill, emery lars. 26 pieces in all— construct dozens - - r of interestin pieces, 2 plan books and color chart, 1§-ineh wheel, scratch brush, buffing 18 pounds of scientific things, including tical "level, “16-inch "crom-cut and dandy ; » ee. eyhole saw, also inch plane.’ Packed in wheel, etc. And—Boy, here’s fun—the kind of fun Toys, Bird Hous- brare-bound chest. Sapolin speed enamel ; - 2 ch gee RRP cw ote Bp reer eorren bow. $15.00 news, this workshop’s equipped you'll never get tired of. age ag THE DELUXE CARPENTER 8 with a 1% H. P. Universal Meal he-man tools for Etc. ' : Motor and A. C. or D. C., the boy builder. Two pLANBOOKand level, 20-inch eros, iS-insh rip, aadidandy with toggle switch, cord and completebooksthatshow catalog describing AS ff yt gt z ° & ® = 3 7 ” brass corners and lug. Send the coupon and get clearly and exactly how to yarious Big Boy lock. Sapolin speed enamel........825 n 4% klet that t if 7 ie build hundreds of wonderful Tool Chests come BOY’S SIZE e booklet that telus you al IN ~— useful things. See“Big Boy” © your door free | 1.415 peLLow’s SET No. 701. Contains words and pictures. at your favorite toy shop. for the asking. 11 pieces with plan book oaanes Sa — fill out DANDY BIG SET No. 701E. The set for i the beginner. Contains 12 pieces with plan the little . ry coupon be PRACTICAL YOUNG CARPENTER'S 8 THE NEW 1 LINE INCLUDES THESE IMPORTANT DESIRABLE FEATURES ET When you are looking for a Genuine Chest of Tools, be ow and No.702. 16 pieces with plan book. . . .$2.50 sure to get these big exclusive features contained in the mail to- HANDY SET No. 707. Practical set for Dad's Size Chests. ay. boys, 19 pieces including plan book. . . .$3.50 1. Big Boy Tool Chests have more and better tools than FAMOUS No. 765. Feature set in Boy’ other chests of equal value. i Size Group. Dandy Set. 24 pieces. Real 2. All metal spirit level in No. 785 and up. tools for practical service. Packed in big 3. High quality ground faced block plane in No. 765 ced chest wh gina Seck..... cemaed and No. . 4. Beech pane, the kind that real carpenters use, in No. and up. 5. Sa —X, 3 c art. Home Rtonget, + Seek and J ERECTOR SOU ARE. NEW HAVEN CONN Sapolin Speed Enamel, in all Dad's Size Chests. : , : pad . 6. New 1929 Plan Book in all sets. Please send me free copy of Plan Book and Gilbert 7. Carpenter's apron in No. 785 and up. Toy Catalog. 8. Brop Seages hammers in Dad's Size Chests. 9. Big Boy Saws. EE- 10. Metal Tray. FR ° NAME... eee eeeeeeeeeseeeeeeeeess ll. Big red brass-bound chest. Fi apg a et ce : THE A.C. GILBERT COMPANY, NEW HAVEN, CONN.,U.S.A. = srreet.. Manufacturers of the Famous Erector and Chemistry Sets, Magic, Motors, Etc. A. C. Gilbert’s Radio Sports Talks. See Station Listings Page 133 CORREO O EEE E HEE EE EH EES CITY... .ccccscccceces se eeeeececereeesereseress

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124 POPULAR MECHANICS ADVERTISING SECTION en{irel No. 24. Range O to 1” by ten- thousandths of an inch. + The new Brown & Sharpe Micrometer Caliper No.24 measures direct by ten-thousandths in a new, easy way. Ten-thousandths can be read as easily and positively as thousandths on an ordinary microm- eter. Notice the widely spaced graduations on the lower thimble where the ten-thousandths are read. Compact in design, easily used, easily read—there are no gears or intricate mechanisms to get out of order. Ask your dealer to show you this new microm- eter or write us for circular. Dept. P. M., Brown & Sharpe Mfg. Co., Providence, R. I., U. S. A. [BS “WORLD’S STANDARD OF ACCURACY” BROWN & SHARPE TOOLS A better way to read ten- thousandths Lione are $7 HE Tus the wh thousa Lionel tion! locome with yc Witk of the . System the Co See driven motor rcasser Also "Giant electri El Model

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a read POPULAR MECHANICS ADVERTISING SECTION Lionel Electric Trains are priced from $7.00 to $325.00 Tos photograph tells the whole story better than a thousands words. It shows you how Lionel Model Electric Trains look in ac- tion! It pictures the realism of these remarkable locomotives and cars. It shows you what you can do with your Lionel trains and accessories this Christmas. With such a Lionel Electric Railroad you learn many of the details of actual railroading, for Lionel Railroad Systems are true-to-life models of the big railroads of the Country. See the new Lionel Steam Type Loco—electrically driven by the famous Lionel “Bild-A-Loco” motor—the motor that may be removed in a jiffy, taken apart and reassembled again. Also, see the new Lionel electric type locos. These "Giants of the Rails”’ are the most powerful model electric locos ever built. LIONEL ELECTRIC TRAINS Model Railroad Accessories * “Multivolt” Transformers THE LIONEL CORPORATION, Dept.C, 125 Send for the FREE Lionel Railroad Planning Book. HERE’S A LIONEL ELECTRIC RAILROAD THAT ANY BOY CAN BUILD Remember, too, that Lionel trains can be control- led and operated by Lionel Distant- Control”— which enables you to start, stop, reverse or switch your trains at any dis- tance from the track. This is a feature that every boy is enthusiastic about. Write for the catalog today—it shows all the new Lionel models. See the Lionel demonstrations at your local stores. ON THE RADIO STARTING NOY. 8th Every Friday night, 6-30 to 7 00 Eastern Standard Time, “t/ncle Don" and his Lionel Engineers’ Club over stations WOR, WLW and WBBM Listen-in and enjoy this wonderful Lionel radio program, and laugh with “*Uncle Don “ BOYS: SEND FOR FREE BOOK FREE: Don't delay another instant Write today for a FREE copy of the new Lionel 46 page handsomely illustrated Railroad Plan- ning Book and catalog, and pick oul the set you want for Christmas The Lionel Cor- poration, Dept C, 15-17-19 East 26th St . New York Cily 15-17-19 East 26th Street, New York City

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ny eS Ett AED | Moulding Cutter POPULAR MECHANICS ADVERTISING SECTION Motta Electric Handi-Shop " (Pat. Jan. 1, 1929) 1 __ _ A complete motorized workshop for craftsmen including all necessary equipment for Circular Sawing, Wood Turning, Scroll Sawing, Sanding, Drilling, Grinding and Buffing. Full instructionsand blue prints furnished. New “DELTA” Cuts Over 50 Moulding Shapes With Only 4 Sets of Blades Interchangeable high speed blades produce over 10,000 cuts per minute at 3500 RPM Blades require no individual adjustment. Quickly and easily locked in position. Special guide fence. Unusually low price. Below are a few of the many attractive mouldings that can be made with this Delta Moulding Cutter. aaa: CLeS Practical Design—Dependable Quality Plus Many Exclusive Features that’s what you find in every woodworking unit bearing the Delta trademark. Craftsmen, artisans, farmers, mechan- ics—ali who use wood in their daily labors or spare-time hobbies—are delighted with the sturdy construction, splendid efficiency and moderate cost of Delta equipment. They appreciate keenly such practical constructional features in the Handi-Shop as: 1. Two-shaft motor that permits carrying on two important operations at one time without con- tinually dismantling set-up. 2. Heavy U-shaped Lathe Bed (no rods) guaran- teed not to chatter. 3. Automatically Oiled Bronze Bearings. 4. Patented Tilting-Tables. 5. Circular-Saw Raising lever. 6. Absence of interference when sawing large pieces of lumber; and many other important improvements found only in Delta products. 10-DAY TRIAL EASY TERMS For complete details and full description of the new 1930 Delta line, send coupon for FREE illustrated literature. You will learn also how you can try any Delta equipment for 10 days under actual working conditions at our risk. Your choice of three convenient payment plans. Mail coupon on opposite page today. It describes numerous items of interest to those who work with wood. ne ie Dolla Speciarty Co The Cire mod Now sturc conv ingly Unit A con Perm ing i Joint from belts. other separ: welde heigh at ar nishec sired. Consi moun stand work Built deper work. clusiv ing Fi perm at an) guard bronz slippi nishe« moto! 8-1 Consi grace desig! stead bronz Miter Cran! ment moto:

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the nan- ‘ime ‘ion, ent. onal 1930 ture. ment risk. Mail rous O. POPULAR MECHANICS ADVERTISING SECTION Woodworking Units OF HOME CRAFTSMEN, FACTORIES, SHOPS, CONTRACTORS 4nd FARMERS The introduction of the Delta Jointer and Circular Saw Units marks a new era in moderate-priced woodworking equipment. Now, for the first time, are available sturdy, practical machines in compact, converient form at price levels astonish- ingly low. The new Delta Units include: Combination 4-Inch Jointer 8-Inch Circular Saw Motor Driven A convenient, efficient combination. Permits sawing, sizing, and smooth- ing in one quick operation. Both Jointer and Circular Saw are run from the same motor with separate belts. Neither Unit interferes with other. Can be operated together or separately. Mounted on sturdy welded steel stand of convenient height. A rugged portable outfit at an attractive low price. Fur- nished with or without motor as de- sired. 4-Inch Jointer Unit Consists of new Delta 4-inch Jointer mounted on separate welded steel stand. Produces smoothly finished work in surprisingly short time. Built to give years of satisfactory dependable service on production work. Incorporates numerous ex- clusive features such as Self-Align- ing Fence with accurate graduations permitting fence to be set quickly at any angle from 0°-45°; Fool-proof guard; Automatically-oiled bronzed bearings; Non- slipping V-belt drive. Fur- nished with or without motor. 8-Inch Circular Saw Unit Consists of new. Delta 8-inch circular saw on gracefully designed welded steel stand. Practical design and sturdy construction make it ideal for steady production work. Has Automatically-oiled bronze bearings; Patented tilting table; practical Miter-gage and Rip gage; Raising and Lowering Crank Screw permitting micrometer-like adjust- ment; V-belt drive. Furnished with or without motor. Send coupon today for FREE Illustrated Literature show- ing many items of interest to those who work with wood. Dept. A.129 Divisionof Delta Manufacturing Co. 661-67 HOLTON ST MILWAUKEE , WIS 4-Inch Jointer 4 Unit *“‘DELTA”’ Circular Means Quality in | Saw Unit Every Detail Deita Specialty Co., Dept. A.129 Division of *‘Deita Pawn BL Co."" 1661-67 Holton St., Milwaukee, Please send me without obligation, FREE illustrated literature showing new 1930 Delta iine. Also full details of your 10 day trial offer and easy terms. (Check proper square) O I am particularly interested in Delta Electric — -Shop. O I am interested in new Delta Woodworking Units

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128 POPULAR MECHANICS ADVERTISING SECTION as the rushing getaway as you open the throttle — the quiet speed as you flash ‘down the road — the eager power as you zoom over a hill! “45 Twin” for 1930 — a very popular mod- el. The ideal solo motorcycle. That’s motorcycling, on a Harley-Davidson 45 Twin — and no other sport has such a “kick”. You will find new thrills every mile— whether you ride on long tours, short jaunts, or just to work and back. And the total cost is barely 2 cents per mile, including everything. Let your nearest Harley-Davidson Dealer show you Mail the the 1930 models — look over their new features and Ee Coupon{ improvements. Ask about his Pay-As-You-Ride Plan. HARLEY-DAVIDSON Motorcycles HARLEY-DAVIDSON MOTOR CO. Dept. P., Milwaukee, Wis. Mail This Coupon Interested in your motorcycles. Send literature. —for literature showing our full line Name of Singles, Twins, and Sidecars. Prices Address. range from $235, f. 0. b. factory. My age is [] 12-15 years [) 16-19 years [) 20-30 years [] 31 years and up. Check your age group. AI i ARE = pe

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POPULAR MECHANICS ADVERTISING SECTION 129 not N OT just making things, but making them right—that’s the big kick you get out of your shop down cellar when you work with Starrett Tools. Each of the Starrett Tools shown here — and many another be- sides—should be in your tool-chest. They are accurate, practical, dependable. Write for Catalog No. 24 “AP” showing over 2500 Starrett Tools. Your dealer will be glad to show you the tools you select. just making things -- Starrett Dividers No. 92 Starrett Micrometer No. 320 Starrett Combination Square No. 04 Starrett Pistol Crip Hack Saw Frame No. 153 THE L. S. STARRETT CO. World’s Greatest Toolmakers Manufacturers of Hacksaws Unexcelled Steel Tapes— Standard for Accuracy ATHOL, MASS., U.S. A. a

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130 POPULAR MECHANICS ADVERTISING SECTION >> ON DUTY WITH THE NEW YORK STATE POLICE FROM THE CANADIAN BORDER TO LONG ISLAND SOUND, PATROL CARS CARRY THIS UNFAILING WINTER PROTECTION « « EVEREADY PRESTONE READ what Major John A. Warner, Superintendent, has to say about the use of Ever- eady Prestone, the perfectanti- freeze, in the cars used by the New York State Troopers in theperformanceoftheirduties: “We have had no single instance where complaint has been found with ‘it. It has been employed under the most trying of weather conditions. Frequently our men are on the open roads for hours at a time, during which their cars must function under all sorts of stress and strain. “It is gratifying to us that during the past two years Eveready Pres- tone has contributed so materially to the success with which the State Police have been able to carry on their work.”

Wherever men, engaged in hazardous cold-weather duties, entrust their lives and reputations to motors, there you will find Eveready Pres- tone. At Army flying fields. At Navy air stations. With Com- mander Byrd in the Antarctic. And one supply of Eveready Prestone will provide your motor with the same |com- plete, permanent protéction against freezing. It posgesses all the properties poinged out by the National sur w of Standards as esse ia ran anti-freeze. ¢ A single supply added to the

. # af 2 Eveready Prestone does not con- tain any alcohol or glycerine. 9 POINTS OF SUPERIORITY 1 Gives complete protec- tion. 2 Does not boil off. 3 Positively will not dam- age cooling system. ~ 4 Will not heat up a méter. 5 Circulates freely .at,fthe lowest operating temper- atures. 6 Will not affect paint, var- nish or lacquer fines. 7 Non-inflammable. gOdorless. * iy pee tg Bi EV EREADy PRESTONE (TORE mane 86.) FOR PREPARATION QFE THE PERFECT ANTI-FREEZE radiator will provide trouble- free surety against all freez- ing hazards through all -kinds of weather. You can buy it at the nearest garage, filling Sta- tion, automobile supply shop or hardware store. <EST BO, Thoroughly tested and AR AY 100% poe Ae: by the “Y American Automobile _* = & Q 5 or aristeo Xo Association. NATIONAL CARBON Co., Inc, General Offices: New York, N. Y. Branches: Chicago Kansas City ae has San Francisco Unit and Carbon Union Carbide Corporation

Buffe: Grine Assen

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am- ithe Der- var- -S. ~ity arbon ation POPULAR MECHANICS ADVERTISING SECTION 131 Assembly Chest 18°COM POUND TOOL REST ~ Sold Only Direct from Factory MakeTI Complete arming ne ay Shop Yourself/ Improved Features -Exclustve Advantages tie The right kind of tool-equipment is even more necessary than your own ability and desire. Now, you can dothe things you long have wanted to—at homein your own modern motorized — shop—with th: = new, improved Waco Red Jacket Wonder-Shop. No other compares with it in its — interchangeable, power features, efficiency, exclusive aevenmages and q eae Family ot Waco Wonder shop Workers Red Jac’ tested, approved and guaranteed AW pro ee . Hnationally ph — and manuinesurer who has aT his own life’s hobby into a cooperative association of thousands of amateur and fessional craftsmen. He invites you to join. He will instruct, guide and Top Table elp you. A new zest in doing things awaits you. The new 1930 Red Jacket Combination brings you the powerful Red Jacket Master Drill Motor with direct drive to the Waco Craftsman’s Wood Mb | Lathe Kenpactty 9” x 36”), Compound and 18” Rests, Tilting Top Mitre Saw wi both depth and side gauges, Sander Disk, Scroll and Jig Saw, improved Band Saw, and all accessories for both portable and stationary power drilling, buffing. —— and cleaning. Attaches to light socket. Converts your work ben nto a complete private tool and machine shop—a complete chest full of elec- trically driven tools for your own private use. Add New Special Equipment Any Time as Desired Take pour choice of four different assemblies to fit your present ideas and uses. A, time you wish to expand or add new special equipment poe can doso. The Red J Jacket Assortment is the most complete available anywhere. Avoid mitations! Waco Red Jacket is the pioneer—foremost in the field—sold only direct from the factory; not ugh stores, Buffer and Grinder Assembly Professional Quality Buy It NOW On and Efficiency Easy Terms The choice of professional as well as Coe $10 down. Easy monthly pay- sponds home craftsmen. Red Jacket Shops nents. Liberal discount for cash. FREE Blue Prints are making money for their owners all No hardship to own a Waco The WACO over the country. You can be one of Jacket. You can make it more than GUARANTEE the Red Jacket Guild chain and mar- pay its way in = if you want, as If it is not what you ket your products if you want under well as in the pleasure of doing things went when you ont 1s our new plan. for yourself. —send it Send NOW This Coupon for Interesting Literature Detailed descriptions and specifications. You will be sur- FREE prised and fascinated by the possibilities afforded Just see what at yous can makeanddo. Fillin and MAIL TODAY. In 5216 Ww. Kinzie St., Chicago. Til. Manager, Dept. 112: Please send me all free information and literature on Red Jacket Assemblies and FREE Powerful | | Services. Sesh wnuaned ITTTITITITITIT TTT oe and useful | ever devised. | PPPTTTTTTTTITIT TTT TIT IT TTT eS —e~ 3 Head Stock— i For any kind of power ' gg PPPTTITITITITITITiTT itr titi ook-up.

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132 : co mer Aa POPULAR MECHANICS ADVERTISING SECTION Gee, Dad! : Couldn’t We Have Fun with One of Those Chests ! Aset of tools—what do they mean? To the boy—boats and airplanes and swords and heaps of shavings; to Dad—a workshop—hours of in- teresting recreation with his boy. Boys or men, the fascination is the same. Why not a chest of Stanley Tools for them this Christmas? There are ten different sets all packed in sturdy chests. From $10.85 to $90, there is one to fit every purse. There are also twenty-five Stanley Plans giving step by step instruc: tions how to make twenty-five use- ful household articles. The book, “How to Work with Tools and Wood,” is a practical textbook and guide for tool users. Plans cost 10c each; book, $1.00. Your hardware dealer will be glad to show you these tool chests. Ask him for a copy of Stanley Tool Chest Catalog No. $35d or send to us for a copy. THE STANLEY RULE AND LEVEL PLANT New Britain, Conn. STAN LEY TOG. CH ESTS f -- HELI who BLA TOR sure | town. your real | pelin, from 1 it ov! silver peller: And t can | mech WEA ORs > ha > = —2OQODOMO4L io] m4vpomeozs” Ser eooO-usz nH Ou 7 KOA AMM age eee eM aM ee ees esese

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J 01 O8 Op) \ HELLO, BOYS! The bo: who gets my new TR ail BLAZING No. 8 ERE TOR for Christmas eo sure be the talk of the town. When you've built your 5-foot model of a real trans-atlantic Zep- pelin, your pals will flock from miles around to look it over—with its giant silver bag, gondolas, pro- pellers, landing mast. And that’s not all. You can build almost every mechanic vad invention you can imagin Think what, ‘a thrill you'll get building these wonderful models that whiz and hum Shovels, Locomotives, Der- ricks, py Power Plants, are 0} ‘ew. Now, bo’ At, here’s the way to get this barrelful of Ted blooded fun. Send for the amazing Mysterious Erec- torscope and Catalogue that tell all about Erector. Show it to your Dad — then take him to any good My | store. Let him see Erector himac If. It’s a sure way to get te World's Greatest Toy for Christmas. AG SUNDAY AFTERNOONS Tune in on RADIO’S ZIPPIEST FEATURE A. C. Gilbert’s Famous Sports Talks Let me introduce to you Babe Ruth and other great Sports Heroes of 1929! Hear them broadeast their inspiring America Every Sunday afternoon inning Novem- ber 10th emember the WRC Washington, D. C. WGY Scheneetad: WGR Buffalo WSAI Cincinnati ‘YW Chicago WS = Detroit 8D St Lou ¥CCO Minneapolis, St. Paul IC Davenport ¥HO Des Moines y Omaha Kansas City J Milwaukee Cc Puberior, Wisc. & Duluth nv 8L Salt Lake City San Francisco HQ Spokane’ and other N. B. C. Chain Radio Stations. ‘Hello boys / a build this @ "giem none 2° Gr Lit ner we POPULAR MECHANICS ADVERTISING SECTION 133 RECTOR with THE TRAIL BLAZING NO. 8, The Set That Builds the Zeppelin, $25 The giant ship of the skies, and hundreds of other great inventions. Includes girders for Zeppelin frame and landing mast, silver bag, gondolas, pro- yam ae stabilizers, and in addition includes all the parts of the Sensational 7% Erector. SENSATIONAL NO. 714 Mororized Erector BUILDS the CHASSIS, $15 Here's the set I know will give you the greatest thrill you ever had. Fun? Oh, Boy! It’s the real thing. From this great assortment you can build over 800 models. Automobile Chassis, Tractors, Scooters, Fire Engines, and a Hook and Ladder are only a very few. Packed in a big, red, brass- bound chest; 15 inch steel truck body, steel model building tray, manual, powerful electric motor, assembled gear box, ise wheels, oversize balloon tires, fenders, radiator, hood, bumper, springs, steering wheel, heavy truck axles, cab top steam boiler, steam shovel—in fact, 25 Ibs. o scientific thrills for every day of the year. Why the New \929 ERECTOR. is the world’s greatest toy 1. PATENTED ERECTOR GIRDER. A real genuine girder like engineers use. The interlocking edge, a novel, exclusive ERECTOR feature, eliminates bending and makes it possible to connect two girders, sturdy and strong, with a single bolt and nut, and a four piece square girder with two screws only. (In all Erector Sets. 2. PATENTED ERECTOR MOTORS. Powerful Battery Motor in No. 4, 6, 7,74 and 8. Famous Polar Cub 110-volt Universal Motor in No: 9 and 10. 3. PATENTED ASSEMBLED GEAR BOX. Adaptable to every poesible gear combination, and for reversing movements. Convertible into 3-drum hoisting engine. Standardized for use with either battery or ~ olt Motor. the Famous No. 4 Set a - HEAVY STEEL TRUCK BODY, 15 inches long. ERECTOR feature. In No. 7'4 Set and up. 5. 3% INCH SOLID STEEL DISC WHEELS WITH BALLOON TIRES. An exclusive ERECTOR feature. In No. 7% aad up. 6. PATENTED BIG GIANT CHANNEL GIRDERS, straight and curved. Electrically baked in brilliant red. Exclusive = “O%--+-+++e-seeeereennes $5.00 ERECTOR feature. In No. 7 and up. . ae ag, BEGINNER'S SET NO 7. LARGE STEEL MODEL BUILDING TRAY, pierced with he Set that builds the ERECTOR standard holes. Patent pending. Exclusive ae ers ox éaseeceh $1.00 ERECTOR feature. In No. 6 and up. THE ADVANCED NO. 3. The NEW ERECTOR ZEPPELIN FEATURES Set with the long girders $2.50 Patented Erector Zeppelin girder, silver bag, gondolas, propellers, THE GIANT NO. 9. The Mechani- stabilizers, rudders, etc. cal Wonder Set, with 110-volt $35.00 Famous ERECTOR Sets = hg + 4 ay | 7. The Set Included assembled in “ ” —— eo10.06 THE WONDERFUL NO. 6. In the Big Red Chest with tie Steam Boller........... .$7. 50 THE FAMOUS NO. 4. With pow- = Electric Motor and Gear — Exclusive OTHER EXCLUSIVE SESSA TIONAL FEATURES Motor....... Patented curved girders (in all sets); giant fi y wheel machine frame (making possible the ° y models); Patented THE DELUXE SET NO. 10. Com- duplex ake plate (double standard holes), making it possible to use pate, N — aeeepen ERE eee axles of two sizes; Erector Dredge Bucket, Tip Bucket. EXCLUSIVE MECHANICAL WONDER FEATURES Duplex Plate, Cam, Flat and Cone Pulleys, Quarter and Internal Gears, Eccentric Loop, etc. pt , meh EXCLUSIVE ERECTOR AIRPLANE FEATURES THE BIG GIRDER SET NO. Fuselage, wings, cylinders, propellers, stabilizers, rudder, pontoons, Wo we that builds the Pert -_——o ELECTRICAL SET NO. 5. The fet that “isso struts, nose, swivel. SENSATIONAL AUTOMOTIVE FEATURES ERECTOR AIRPLANE SET NO. Truck body, fenders, radiator, hood, axles, steering wheel and C. Flies by an electric motor $10.00 knuckle, springs bumper, heavy duty disc wheels, etc Adem Ghenetiatuanrs ot FREE? As long as they BIG BOY TOOL CHES last GILBERT CHEMISTRY, TD A. C. GILBERT'S AMAZING M YSTO-MAGIC AND MYSTERIOUS ERECTORSCOPE The first lucky 100,000 boys will get absolutely free the My ——_ Erectorscope. It will fool t' smartest boy. You have never seen anything like it. Just look through THE A. C. GILBERT CO. 123 Erector Square, New Haven, Conn. Please send me my free copy of the Mysterious Erectorscope and Gilbert Toy Catalogue. the Erectorscope; you_ will not I sts cca 6cdblins this ceevcernss scenes ° believe your eyes Everybody will want to look through it. Mail Street the coupon today, and get your GEG so eco ccccocctesisiccecccovecessqean e Erectorscope and Gilbert Toy Catalog. 2 pT rrT TTT TTT Tire? State......++ ee

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POPULAR MECHANICS ADVERTISING SECTION All Around the World! ANTARCTICA HOLLAND JAVA JAPAN MELBOURNE OU can hear words and music from Java, Australia, England, France,—from all around the world,—with the NATIONAL Screen-Grid SW-4 THRILL BOX. Already many famous broadcasting stations abroad and in this country are putting their regular programs on the short waves, too. ‘ More and more stations are doing this. These “broadcasts may be received anywhere else in the world, in cities, in the country, at the ‘frozen poles, in the jungles and the deserts, with the NATIONAL THRILL BOX. This simple Four-Tube Screen-Grid THRILL BOX is a trim, neat receiver with single dial tuning and smooth sensitivity- control. It is free from annoying radiation and the design eliminates “tuning holes,” formerly a troublesome short-wave difficulty. The special audio system with 171-A Power Tube gives excellent loudspeaker operation, and the plate supply may be taken from the NATIONAL lighting circuit, through the NATIONAL 7 Velvet-B,—a feature not usually found in shortwave receivers. The interchangeable tuning transformers are kept in special storage sockets inside the cabinet, protected from dust and damage, and always ready for use. The cabinet itself is more than just a box. It is of simple and very attractive design and finish, which harmonizes with the most taste- ful surroundings. Write us for full information and prices today mentioning Popular Mechanics Maga- zine. NATIONAL COMPANY INC. ENGINEERS & MANUFACTURERS 61 SHERMAN ST., MALDEN, MASS. Est. 1914... W. A. Ready, Pres. & THRILL BOX SCREEN-GRID SW-4

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POPULAR MECHANICS ADVERTISING SECTION in Your Own Home | XAMINE IT, show it to your friends, play it as much as you wish. An ample free trial—no obli- gation to buy. We make this liberal offer because we want you to see for yourself this — quality of Wurlitzer instruments, the result of 200 years’ ex- perience. Noted musicians praise them for unusual tene quality, artistic workmanship and ease of play- ing. ‘They are used in the finest bands and orchestras throughout the country. Easy Payments If you decide to buy, payments are arranged in small monthly sums. A few cents a day pays for ran hy instru- ment. Special offers on complete musical outfi SEND ror New Catalog The greatest musical catalog ever published! ae | 3,000 articles—every known instrument described and illustrated; many of them shown in full colors, Gives you lowest Prices and all details of Free Trial, Easy y payment plan. Ail sent FREE—no obligation. Send coupon be THERUDOLPH WURLITZERCO. , Dept.1779 117 E. 4th St., Cincinnati Send me, absolutely free, new illustrated catalog, with prices) and details of Free Trial Easy Payment plan. No obligation. | Instrument (State Instrument in which you a are re interested, Copyright 1929, The Rudolph Wurlitecr Cos

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136 POPULAR MECHANICS ADVERTISING SECTION / SALES KIT WORTH $15.25 \ me For Only $4.75 BE —_ sales representative, full or part time. Enjoy pleasant work taking orders for one of America’s largest leather goods con- cerns. Sell jaick-moving, fine-quality genuine leather articles suitable for gifts and personal use. Big commissions! Call on your friends, busi - ness people, lodge brothers. Ev article in extensive line made by cuuete of the Famous vorsen Patents. This guarantees the quality. Order the kit now; receive excellent assortment of sample articles at ue § $4.75: Halvorfold Calfskin Billfold (Value $5.00), Halvor-K Case of Pin Seal (Value $3.75), Halvor-Car Case of Steer Hide, laced and embossed (Value aP-72) Morocco Letter Case (Value $2.75), all articles cornered in gold. Also hand- some pocket kit case for carrying outfit, with our name in 23K Gold across cover. Order kk and pricelistincluded. Retail value $15.25. Remember, $4.75 sets you up in business. Act now! Whether you work full or part time you'll make big commissions. Get complete informa- tion. Send coupon at once! The gift season is on! Get in on the profits that are easily yours. Dept. PM, U.S. LEATHER GOODS CO. 564 W. Monroe St., Chicago, Illinois I want to be your special sales representative and am enclosing $4.75, cost price of com- plete kit as described. Send full sales equi ment. My name as below toappear on kit in 23 Gold. I am to receive liberal commission. If * not satisfied in any particular, I will return out- fic and my money will he refunded immediately. y Set Yourself Up In Business (AGENTS AND SIGN MEN Silver Ace Models Winter Flying IE Christmas brings you a SILVER ACE, you won’t have to wait months for warm weather to enjoy it. With these new pyralin skis, designed in type similar to those used by Commander Byrd in the Antarctic, you can, in one day, build a SILVER ACE Spieit of St. Louis or Fairchild cabin model, and fly it over deep snow and ice. Attachable with five minutes’ work to all SILVER ACE convertible models, or to our famous flying Fokker with special wires. Skis, $1.50 a pair extra at all dealers. Add 25 cents if ae 3 by us. id remember SILVER ACES are world famous for their beauty, scientific design, demountable, silk covered waterproof wings, and above all for their — performance. They are designed by aero- nautical experts, and cost less in the long run. A steel winder with every set. Send 10 cents for 32 page catalog describing 18 genuine SILVER ACE dels and ible con- struction sets. Sailplanes, Monoplanes, Biplanes, Seaplanes Ready to Fly, Partly Assembled, Knocked Down. Prices, $1.50 to $25.00 Sold by 1000 dealers. 50 cents extra if shipped by us. AERO Mopet CoMPANY (2X) Dept. M 12, 111 North Wacker Drive (2%) CHICAGO : a Now Making $50.00 to $100.00 and Up Per Week Selling Our GOLD LEAF SIGN LETTERS For store and office windows, board signs, trucks and glass signs. We also make to order script signs and business emblems singly or by the per capital or experience required. Big demand in every city. Samples and Literature Free. CONSOLIDATED SIGN LETTER C0. "S.cage °c" Reduce at will / — this positive , harmless way 10 DAYS FREE TRIAI 6 montus TO PAY AT LESS THAN 20¢ A DAY ~ WRITE for ODeTAILe a (Small Weekly Payments Now—Spring Deltoery at Winter Prices) |, 826-28 State St. Shipments to all CRANDALL CYCLE CO. 2-28 State St. Shipments Stop that ruin hatter on Ford Owner yourcar. MAKE THIS TEST —take out your floor boards, pull youre: gency brake bac at bel 4 4 y mer and forth. Ifyou notice xy our or order Bredar's Shim. SON Ricks SCIENTIFIC ye IL uae 453 Oe ete oe pal NYC is CATALOG ete A . POSTAL BRINCSIT LATHE THE GEROLD CO. AMATEUR M ICS, REPAIR SH VENTORS, STUDENTS WA D E —r na a Fe For Mets!- Weed chive meterieig, Tursing’Facing “Soriog”Driling' “Winding Toread Catting Aces 2 one BENCH Cerenect slide rect has travel entire fength of c Ugatgcrew ynside bed Mont Lethe, plate boas beck-geared headstock, $68. isthes 16 inches be te line of -A—_. A —', = prices. Write for free catalog. Dept. P-58 120 Liberty St. New York

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POPULAR MECHANICS ADVERTISING SECTION Boys! @ here’s a M. illion Dollars worth of Fun! isis ~& tie — Giant Block-setting Crane. B it with EVERY BOY likes to see, and know why the wheels go round. Meccano answers every question. T’S dead easy making models with Meccano. There are more than 200 accurately machined parts —a part for every purpose —of sturdy stéel strips, with holes every half-inch apart; Brass Pulleys, Gears, Gird- ers, Axle Rods, Couplings, Nuts and Bolts, Miniature Dunlop Rubber Tires and a host of other parts forming a perfectly interchangeable mechanical system. There is world. What’s more, these models actually operate when hooked up with the powerful Meccano electric motor, which comes with outfits No. 5 and Nos. 20 to 70. If you want to become a famous Engineer, com- mence now. All models illustrated in our manuals are built on correct en- gineering principles. FREE—The big Meccano booklet tells simply no end building models of every mechan- ical invention known to the engineering eerpeareet O en MECCANO OUTFITS all about Mec- of fun with it, | no. 10 Makes 472 Models $1.9 cano. It is free, by sending the names and ad- dresses of three of your pals. a. Co., , Bae., Elizabeth, x J. TAS ~a9 co seseeeses yo bos Trans-Atlantic Mono Build it with Steam Roller Build it with Meccano Real miniature RES 48/6 MECCANO TOY ENGINEERING FOR BOYS wie F Realist i- Automobile Build it with Meccano

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“Wheres the can of- PLASTIC WOOD? (Reg. U. S. Pat. Off.) The North Wind doth blow, and keeps blowing right through the edges of the window casing. Stop the drafts with Plastic Wood— force it in the cracks around the frame. No matter what the house construction—wood, tile, brick, stone—Plastic Wood will hold yermanently fast. It handles like putty and ardens into wood. Use it for cracks around the baseboard, too—under door sills, in floors, in doors— wherever the cold air seeps in. It is water- proof and weatherproof, and takes paint or varnish perfectly. Plastic Wood Solvent When working, it sometimes is desirable to soften or thin Plastic Wood, and because of its adhesiveness it will stick to tools or fingers. To soften or remove it use Plastic Wood Solvent, in 25 and 50 cent cans. 1 Ib. can $1.00 14 Ib. can 35 cts. At Hardware and Paint Stores ADDISON-LESLIE CO., 422 Bolivar St., Canton, Mass. POPULAR MECHANICS ADVERTISING SECTION 140-Page Book of record- keeping forms, filled in to show you their uses. It answers problems of ac- counting for office,factory and professions. This Free Book describes and illus- trates Moore’s Security 4-Post Binders, the sim- ree plest, easiest handled on grea the market. To insert or A . help remove sheets takes but toward simple a moment. Low in cost and accurate —long in life. Moore’s rd-k : ee are Different. recora-Keeping Write on your busi- : : ness stationery for Write for it this Free Book on today! up-to-date Loose- Leaf equipment Joun C. Moore Corp, _©*- 3839 6044 STONE STREET ROCHESTER, N. Y. GEARS inneaiate deiiver immediate delivery Gears, speed reducers, sprockets, thrust bearings, flexible couplings, pulleys, ete. A complete line is carried in our Chicago stock. Can also quote on special gears of any kind. Send us your blue-prints and inquiries. Write for catalog No. 10. Chicage Steck Gear Works 769-773 W. Jackson Blvd., Chicago, Ill. oni 3 = a MASTER kind of inside measurement. Just slide INTERLOX a # MASTER till it reaches from stop to fi SLIDE RULE fre, Ne prpessine. wick results. Locks rigid for outside measure, too. Agents Wanted. MASTER RULE MFG. CO.. Inc., 821 E. 136th Strest, MEW YORK CITY ; Ban YOU THIS S AW COMPLETE MOTORIZED GUARANTEED 227, LODE OE fF ° This big, sturdy, powerful 8" Saw with % H. P. Motor —shipped to you onapprov- al for only $5.00. 10 Days’ ree Trial. Thenconvenient monthly termsif you keepit. Sendf or complete facts on this offer and details on Lathes, recone petals wos complete ir 140.P. Motor shop. Write toda. APPLIANCE CORPORATION 225 N. Michigan Avenue cHuicaeo MIDLAND Dept. 1215

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POPULAR MECHANICS ADVERTISING SECTION NATION-WIDE CONTEST TO ENCOURAGE APPRECIATION AND | } PERFORMANCE OF MUSIC BY THE YOUTH OF AMERICA MINENT musicians, educators, civic aug i thorities and pyblic leaders have been ery so eulogistic in their praise of the harmonica rust that this nation-wide contest has been in- etc. e ° . rag augurated to intensify the already keen in- ‘ond terest in this universal musical instrument. i | How to Enter the Contest Here is your opportunity to win a valuable prize and to have plenty of fun while doing it. More than five hundred fine prizes will be awarded. The contest is for the best com- positions on the subject: ‘‘My Experience with the Harmonica.” tetas A | s | 3 #8 If you cannot obtain the obtain Every boy and girl under eighteen years is eligible. You deat even have to buy a harmonica: You don’t even have to own a harmonica. Even if you have never played a harmonica you can compete. Simply use the coupon in the corner be- low to ask for a Hohner instruction book, entry blank and a harmonica catalog illus- trating and describing almost 50 of the famous Hohner harmonicas. The entry blank will tell you just what to do. Fre€eé vo EVERY ENTRANT Whether you en- ter the contest or not, the Hohner instruction book will be a big help to you. Playing a harmonica adds to your person- ality and popu- larity. (--------------— | Contest Editor, Dept. 508-M M. HOHNER, Inc., 114 E. 16th St., New York Please send me FREE items checked below: Instruction Book [] Catalog [] Entry Blank (J | | | rful | stor rove | ent | Name —_——. pit. c | cers | Ade —— $$ ee HOHNER a Harmonicas | City State

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140 POPULAR MECHANICS ADVERTISING SECTION IDEAL~ "is ope ainrLaNes The DEAL: , 7 merican Eagle The Greatest Development in Flying Model Airplanes Wing Span: 26 in. Weight: 3° oz. N entirely new, light-weight, fast- flying Model; distinctive appearance, realistic in flight, unique construction de- tails. Balsa wood fuselage, with specially designed aluminum bulkheads; built-up wings with ready-formed ribs; removable tail assembly. Finished in modern color decorations. Just the Model Airplane you have been wanting; simple in con- struction, and a reliable, fast flyer. Construction Set: Assembled $2.50. Model: $5.00. For Fun and Instruction Build and Fly IDEAL wove. AIRPLANES The most perfect copies of real airplanes possible to make in Flying Models; true miniature dupli- cates of famous planes, wD realistic parts and fittings. Build hem the IDEAL way, and we guarantee them to fly. IDEAL Construction Out- fits show how and contain everything required. Here are several types; pick yours now and get it for CSstetenee: FORD MONOPLANE— a dandy 3-ft. Model of this giant ship. All the distinctive features of the original are duplicated in this Model. Complete Construction Outfit.$8.50 New York-Paris Mono- plane—3-ft. Model of the most famous airplane in the world. A Model every amateur aviator should build and fly Complete Construetion Outfit $7.50 i b MONOPLANE: 3-ft. Model “North Pole” ype. plete Construction Outfit $8.50 Destav ILLAND BiPlane; 3-ft. Model of this famous original. Complete Construction Outfit Cecil Peoli Racing Airplane; 36 in. size. A Champion- ship Winner. C my > $3. 75 Ask for IDEAL Model Airplanes in your local Toy, Hardware or Sporting Goods store. If unobtainable, send your order direct to us. (West of Denver, Colo., and in Canada, add 10% to the prices above.) 64-page Catalogue of Models, Parts, Materials for Model Builders, 5 cents Ideal Aeroplane & Supply Co., Inc. Established in 1911—18 years ago 26 West 19th Street New York City Pay as You Please — sieetiones 5 Select your own payment terms for a Mead instrument. Make money play- ing in local orchestras, Be the “life” of the party wherever you go. 10 DAYS FREE TRIAL—no obligation to buy and no cost to you. Mead instruments are easy to play and a joy to learn. If you can hum a tune, you can play. Free instruction book—new simple method. Send a postcard today for free instrument catalog with mar- velous offers and terms. Be CYCLE CO. i DEPT 254s CHICAGO At $1.00, $1.25, $1.50, $1.75 and up to $4.00. © United States Rubber Company Ked R06 v5 Par OFF WOOD Samples of 33 rare woods $2.00. 20 cabinet and 20 inlay $1.75, or our choice $1.00 OF ALL KINDS gets tatvieds stpaid. Free Price List. CRAFTSMAN WOOD SERVICE. | -715 E. 62nd St., Chicago BIG MONEY easily made by floor Migs ing # contractors who average $40 per 4 The New “American High Production” Machine does the work— makes you the money and builds you a business of your own. No dull seasons—no large capital nor experience required. complete information free without obligation—write today. THE AMERICAN FLOOR SURFACING MACHINE COMPANY 523 So. St. Clair St. TOLEDO, OHIO Ye 5.4 Se PLUMBING HEATING b Cut-to-fit Heating System New Easy method enables any man to in- stall his own PLUMBING and HEATING. Lowest —— prices on Highest Quality & Grade A WE SHOW YOU HOW Send for our new free catalog telling how on save waste material and high labor costs y being your own plum This book has saved money for builders, home-owners, farmers and mechanics for over 50 years. Send for your copy today. id 7 with MIC

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POPULAR MECHANICS ADVERTISING SECTION Entirely NEW... THE CHEMICAL OUTFIT ..-real fun with Chemistry / .; ca the Science of Chemistry jwith CHEMCRAFT; work hundreds of won- derful and useful experiments; make soap, inks and dyes; test foods, water and soil; pro- duce amazing chemical changes and perform surprising tricks of magic. All these experi- ments, and many more, can be done with CHEMCRAFT, the original and leading chemistry set. These NEW sets are greatly improved, the finest we ever made. More chemicals, more apparatus, more and better experiments. Get CHEMCRAFT, then you can invent new experiments of your own and learn useful chemical facts all the time. 9 This is the No. 15 Set Packed in handsome wooden cabinet with extra tray de- * es | signed so it stands upright to Six Fine Sets to Choose from: j Contains 115 chemicals and No. 1—$1.00 No. 5—$ 5.00 No. 15—$15.00 = Picay not found tn other aste No. 3— 3.00 No. 16— 10.00 No. 25— 25.00 0 More than 649 experitrents Each set plete with chemicals, apparatus and Manual ° are explained in book. of Instruction. Look for them in the Toy Department. If , $15.00 unobtainable, send your order direct. st. = | e TELEPHONE Book Try Chemistry WeteCrarr with the MAGIC c The BOYS’ HOME 7 MICROPHONE for 25 ‘WORKSHOP o Get CHEMCRAFT . Junior, the set that it will introduce you to ~ chemistry. Sent post- paid for 25 cents. is Send for Free Magazine Contains fine ideas on B ° Chemistry, Woodworking ; a yourown about the ete mentioned | LECTRIC °fust ask for your copy. TELEPHONE! Design and Make Many Read the inside story of the telephone and The PORTER Useful Ar ticles of Wood! build a real, electri Ww thE e e OODCRAFT will show you how to plan, Sensitive Microphone, a ttle a CHEMICAL th gE 1 *- 4 = Steth - . things. Each set is a complete home work- struments” You can have great fun ompen. COMPANY plane ‘and ail "materials for making Tooke ny i] —— - learn — tele- } a ‘hole bird i air — microphonic science— jence h icles. Sleound Seems . 78 East Ee yy you what to do and how to do it. Two different y Toy Departments and Book Sto MD. direct. Sold b: Jf unobtainable, send your order If unobtainable, send your order - a in New Book-Box Washington St. inciuded; everything in'an unigue HAGERSTOWN Book-Box $5.00

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142 POPULAR MECHANICS ADVERTISING SECTION mee ot Fin -——o~ Lio. ra! Chicago. Genuine Diamonds Guaranteed—CASH or CREDIT five a Diamond for Christmas! Buy from Loftis, the Direct Importer, and be sure of highest quality and most value for your money. Our ring mountings are the latest creations in solid 18-k White gold, elaborately carved and pierced. Set with sparkling blue white Di: Diamonds. a beautiful. guaranteed, or money back. Goods sent for tree it. CREDIT TERMS: Pay one-tenth down; balance weekly, semi- monthly, or monthly at your convenience. All goods delivered

HOW TO ORDER: Send first carneeneinell article desired—name of pane of a work pal py ee in position—age— marriec bow long there. STRICTLY SONFIDENTIAL. < Standard Railroad Watches on Credit at Cash Wrist Watch No. 866—1 Prices teed to stand inspection. 88 whitegold. High grade 15-Je | Bn sie iG CHARGE. ement. ancy. corners; — $is. $1.50 down & $1.50 mo. Our References: No. 897 — Elgin “Legion.

Any Bank or -— ¢ ‘whi Ao gold- ker in the filled case ye i'raleed faured U.S.A. = Fy ten ee. £0 down and

RACING AND SPORT EQUIPMENT Direct from Manufacturers Bodies torte. and Chevrolet $100 a Week i'emeSo"cavernse ES. 2 made $321 in 9 days—sold 5 machines THE EUREKA ADVERTISER and u (Automatic Wrapping Paper Printer) Hi-Compression Heads, under- Automatically prints the merchant's “ADS’’ on his 5 slung Parts, Racing Gears, Cowl ag Paper in one or wes colors. ae, caly Lemos, eo mag Soe 08 anoes ‘ortable or. Tune of Be Mew % York id -¥ machines Radio, Bieyc'es, and C amping mission. We éciver. Outfits. Send 10c for Catalog buy five or more machines—one for each paper showing bodies of rare beauty and Build a Real SALESMANAGER, Dept, A-10, 1201 Cortland Street, Chicago, illincis | “=D cowpment Auto from Used Chassis SPORT FACTORIES Dept. K-2 AURORA, ILL. v.450\INKOGRAPH PENCIL POINTED DEN

Writes with ink smooth as 2 ACTION AUS without mi miss, skip P - — Paper, blot, Pull at " a Maxes 3 carbon n copies one time = in ink Out Pops Protect yourself against ote- oF i | this clever cigarette a ee wd reign

ike ine the ale. “Hoge Y roots fal k Kr Throweh mu: ol rettes. ai gepteanee, eopemocnies onder mans sk Handsome’ gun metal fish. Beuble ‘ection: hitanedaed at ene Poise ieaeaeer . im your . _ 4 — Lb) rier . or &t 70 one to them and i, & big laugh. Either | enclose yo | A Send for Inkograph or FREE sales plan booklet. Sells i } ped or "eR TINDER Co. jus postage on arrival. Money G E N T on sight. no investment, immediate commissions. ae ‘ent 812, 200 Hudson Si., New York en

You Can’t Beat This for Value! Here’s Boice’s newest workshop—the 5-machine Handi-Bench, complete from floor to switch! Designed for industrial or home use. Each machine complete i in itself and ready to run. Boice’s Handi-Bench No. § Boice’s Handi-Bench No. 3 As illustrated below, consists of following S., ment: 78y 12" Handi-Band Saw. 7°x40" Handi-Lathe. 4° Handi- Flot Mustrated. Universal Handi-Gew, 76@ Jointer. Universal Jig Saw. Universal Handi-Saw. 2 Handi-Lathe, Jig Saw, one ¥ h. p. double shaft Motors, double shaft, }; h. p. each. 3’x8’ Bench with motor and 3°x6’ bench with OOP eee ee ee ee Price complete. . Note: Any one or more ma chines in these Handi-Bench outfits may be bought sepa- rately at any time, Send 10c for 80-page cat- alog describing these Handi-Benches and other Boice-Crane machines. Ask about our Easy Pay Plan.

W. B. & J. E. BOICE Dept. P.M. 12-E Toledo, Ohio

C You ica’s tory Surr guar est | fecte supe elect ante savil with day 8 ente! opini final. Or velo radios perfec rock Prices up st ant Posta. or Spec: Offer! Don With rich, dral opera sharp

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ILL. —s y one these ench ty be sepa- any cat- ese ther nes. Pay ICE ef t POPULAR MECHANICS ADVERTISING SECTION SCREEN GRID, PUSH -PUL A T You needn’t send us a cent! Amer- ica’s big, old, reliable Radio Fac- tory springs its 10th Anniversary Surprise in high-grade full-year guaranteed sets at history’s low- est prices! With its latest per- fected Screen-Grid, push-pull, super-powered and hum-free AC electric Miraco’s—you are guar- anteed satisfaction, values and savings unsurpassed. ; At our risk compare a Miraco with highest priced radios, for 30 days in your home. Surprise and entertain your friends—get their opinions. Unless 100% delighted, dcn’t buy! Your decision is final—no argument! Only mar- velousl Tadios, of latest perfected type, at rock-bottom Prices, can back up such a guar- antee. Send postal or coupon or Amazing il — Factory r y\IRACO Don’t Confuse Radio with Cheap ail Radios With Miraco’s Tich, clear cathe- dral tone, quiet Operation, razor- sharp separation RAC RADE MARK REGISTERED CATHEDRAL TONED, SUPER SELECTIVE. POWERFUL DISTANCE GETTER | Compare with costliestsets beforeyou buy! of nearby stations, tremendous “kick” on distant stations and latest improve- ments—you'll be the envy of many who pay 2 or 3 times as much! nd for proof that delighted thousands of Miraco users cut through locals, get coast to coast, with tone and power of costly sets. Miraco’s are custom-built of finest parts—product of 10 years’ suc- cessful experience. Approved by Radio's highest authorities. DEAL DIRECT WITH BIG FACTORY Miraco outfits reach you splendidly acked, rigidly tested with everything m place ready to plug in! No assembling! Entertain yourself 30 days —then decide. Liberal year’s guarantee on each set. Play safe, save lots of money, insure satisfaction—deal direct with Radio’s old, reliable builders of fine sets—10th successful year. POSTAL OR COUPON NOW! SEND (oar ti loney Bolonbosey Ofer - mail coupon night Now/ BEAUTIFULLY ILLUSTRATED #@ = = = os eet Se oo LITERATURE RADIO 10th Successful Year Bidg., Factory & WITHOUT OBLIGATION send latest literature, AMAZING Offer TRIAL OFFER, testimony of nearby users, etc. ITZ) DAYS FREE 7] BEFORE YOU BUY SS y COMPLETELY ASSEMBLED Excels $425 Outfit some very expensive sets in our home, one a $425 9-tube AC set. Thanks is beyond words to tell you what we think of ourwonderf ulbargain. will always praise Miraco’s to everyone. . W. Laupersacx, Barberton, Ohio. Ret he ee FREE A O User OC Agent Dealer 0 Check here if interested in an EXCLUSIVE TERRI. & TORY PROPOSITION. ‘mazing Name 1 D acdress

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144 POPULAR MECHANICS ADVERTISING SECTION PARKS REAL WOODWORKING MACHINES THING! \*390 Here is that famous genuine pump boys everywhere are turning to. Single With Motor stroke outshoots all others. Two to three You ought to have this strokes now give full shooting force. New handy Parks in your shop. Compact, complete ma- F rear peep ay 8 toe ge valves, fully en- losed action. auty. Amazing accuracy. | hi designed like a bi Full factory guarantee for one year. Uses regular |. | Caine Comgned Ske g ae BET sions ance, Few chews datiening pov te ests Mhose apnen sequived only 42x . on 8 " 8 ost. Flo > 2 genuine air rifles ever offered. 72in. Does any kind of cabinet and “The Shooter’s Art” joinery work. Write for circular. Tells how to hold, aim : Files; balgs you guide others in core The Parks Woodworking Machine Co. 23 kaos Of guns. | Builders of quality woodworking maci.ines since 1887 1500-40 Knowlton St. Cincinnati, Ohio Canadian Factory: 338 Notre Dame East, Montreal at your dealer’s ¢.. or sent postpaid s NEW MODEL“G” AIR RIFLE & MFG. CO. 6450. Broadway, St. Louis, Mo. & So Easy Play Before Xmas! OU can play a Pan- ‘ American Trombone, Saxophone, Trumpet or any instrument with a fewlessons and three weeks’ practice, because Pan- American Band Instru- ments are noted for easy blowing qualities, true Price $10 and up purchased tones and accuracy. Moderately Priced through our Co-Operative F ° “ No hardship to pay for Pan- Pian for as low as $1. or free trial offer, write Amarieans. Con be pusshaged down and $1.00 per week easy yment plan after RL on et Pan-American Band Instrument & Case Go, fins ot nstioustry “sdverteed, nd Clevelands moderately priced FACTORY Send ten cents for Bulletin A. 1203 Pan-American Bldg., GUARANTEED instruments Motorcycles chipped te all parts of the world ELKHART INDIANA by teachers and ‘bandmesters. WALKER-INDIAN CO., 1309 Boylston St, BOSTON, MASS. Now! en Electric Nickel Plating: =a Ga tarts, Make $150 to $500 a Week $6.50 Garage, Office or Place of Business. Electrically Deposit Metal—Nickel, Brass, Copper, Silver, or Gold. You can Successfully do all the plating on your Automobile, Electric Fixtures, Faucets, Spoons, Forks, Chandeliers, Tools, Coffee Urns, Surgical and Dental Instruments, Utensils, large or small, Iron Stoves, Music Instruments; recondition worn plating or plate New Work; do it Instantly without interrupting the Service or without removing the parts to be plated with the ALADDIN PORTABLE ELECTRO-PLATER Simple and Economical to operate. Not a toy, but a practical Plating Outfit with which Perfect and Durable Work can be done. Positively Guaranteed to do as we claim. BE YOUR OWN BOSS! Build up a Profitable Aladdin Electro-Plating Business of your Own. This offers wonder- ful ECONOMY to users and BIG MONEY-MAKING possibilities to AGENTS. Thousands in Service since 1924. Write for FREE Beoklet and Testimonials and 30 Day Trial Offer Today. SEE P. J. F. BATENBURG, Dept. 121, RACINE, WISCONSIN |_wanreo ‘evervwwene expe boys swit prac of re

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Mar! to Make TART in business for yourself now! expert hand-filing. boys of 14 are operating the Foley Filer. switch. of repeat business. -~-sarwvc ee SAW S B=

FILED Peau FOLEY FILER SERVICE f. |

Ss ?

POPULAR MECHANICS ADVERTISING SECTION ouN4, Here Is Your Opportunity

BIG MONEY You can do it with the Foley Automatic Saw Filer. Nothing else like it in the world. Files hand, band and circular saws automatically with such mechanical accuracy that they cut faster, and stay sharp longer. Easy work to file 5 and 6 hand saws an hour. Better than the most No experience necessary—even Simply adjust the saw in the machine and snap on the You don’t have to be a skilled mechanic to do it—very simple to operate. practice you can turn out perfect cutting saws that will please your customers and bring you plenty With a little Start At Home In Spare Time Make $2 to $4 an hour in spare time while starting. No high-rent store neces- sary, very little capital needed. You can start in your garage, basement, attic, or anywhere. Soon you will have plenty of business to keep you busy full time. J. J. Southwick writes, ‘‘Enclosed find con- tract for my second Foley Filer. The first machine easily paid its own way and increased business, and I am ex- pecting this to do the same.”’ Frank Huber says, “It is very easy to pick up enough work to pay for the ma- chine in a short time.” No Canvassing You can get all the business you can handle from carpenters, contractors schools, factories, hardware stores, and others. William G. Diederick writes, **lam kept busy filing saws.

To tell the truth, I get more saws than I can handle.”’ Get Started Now! Lots of men, old and young, are making big money filing saws on the Foley. They have a fine paying, steady year-’round cash business of their own. Many started in their spare

<0 — —get in the game! —mai! coupon NOW!

$52 In One Week “TI started filing saws on the Foley as a sort of hobby in my spare time. I got my first machine and in five months had to buy another. Have filed $52 worth in one week and am abso- lutely satisfied. Instead of a playtime hobby it has gotten to be a regular business." E. V. Harper. “Made a new record Mon- day, filing fifty saws in less than 9 hours. M. 8. Gray.

Foley Manufacturing Co. 246 Foley Bldg., 11 Main St. N. E. MINNEAPOLIS, MINNESOTA time. Our Free Plan shows you how to get started. Others are making big profits from the Foley Filer Be your own boss—don’t delay Thomas Hoadley has filed between 25,000 and 30,000 saws during the last two years with his two machines. Foley Manufacturing 246 Foley Bidg., 11 Main St. N.E. Minneapolis, Minnesota Please send me Free Plan telling me how I can start my own business in spare time and make big money with the Foley.

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POPULAR MECHANICS ADVERTISING SECTION

C. E. WARNER, Pres., Cut the Family ~ Barber Bills 2) Afiyone can trim or bob hair, pper bangs, clip neck or underarms in a shape almost im- possible with hand clippers or shears. Operates on direct and alternating current. Will not clog or cut the skin, and cuts as cleanly as a razor. Thousands in use. Rigidly guaranteed. TEN DAYS’ FREE TRIAL If your hardware or electrical dealer can’t supply you, write for interesting booklet, or order from this ad. Send no money —pay postman $8.75. Return it in ten daysif not satisfactory. State whether 110, 220 or 32 volt current is used. Dealers and Representatives Wanted Belle City Appliance Co., 922 12th St., Racine, Wis.

A red handle with a gold stripe marks the most ular blow-torches in the world. They are Clayton am- bert blow-torches. CLAYTON & LAMBERT MFG. CO., Try 30 oy TT Days OTTAWA AWA OTTAWA Sr pet on coming.” Every sow Backed by 10-Year Guarantee FR EG ey crn tees ogd oftrerp ap 0

DETROIT, MICH, It's easier. now, than ever betase to ene Op easiest-moved, most powerfu fastest- you cai ke big mo pat LWP ay J le = e wig . Stav: ice, shing WRITE TODA FOR FULL DETAILS.

Werking For You!

sell- mee Money —ing'at se cord iv own 5 into the "wood. bus = * Don't let 350 Cuts a Minute ! Sean ‘colon va oa terms. Take any size log To — in a few seconds wn : Tes tet ss you oe, <0 all sawed up— or firis cou y eleteetel — 1) postcard today for wonderful new edition of the Be sure to investigate—it will help you to = big money. OTTAWA MFG. COMPANY 1745-L Wood St., Ottawa, Kans.

SALESMEN WANTED! SELL COX HOLDEAST SCREW DRIVERS Sells on sight to mechanics

Releasing. Send SOc for sample and ok how y get Salesman’s Outfit Free. Ss. 3. C ot. F FRANKLIN, PA. A Genuine Robbins & Myers 1/4, H. P. Electric Motor for 110 V., 60 Cycle light circuit at 4 the low cost of $10.70 net. A tool that will ~—— your chores, connected to your lathe, grinder, pump, washer, etc, Always ready for service. ROBBINS & MYERS, Inc Department A, Springfield, Ohio SAW TABLES Portable and heavy, 16 types This No. 14 Portable is well built, highly, ef efficient, and excepti ly, convenient for light eth __ Sutin table raises and lowers, ete. 30 wood: erhins machines include band saws, welt fe —, pap =, shapers, jointers, =, 5 mann eee ond matcher, variety weaguateer, ‘in grinde ‘ut-o! vut-off say bore: ow « mortisers, tenoners, ‘universal woodworkers, universal varietyeaws THE CRESCENT M z SCENT MACHINE CO, ie PAGE'S

HOW Ow rou MaKe YOUR OWN VE FURNITURE fend 10 a mad sie ior Le New Third

ferent ae neste asses Ave Gloucester Mae), mmm Mass

Soviomiths ae Real Drill for €very Man! It’s a brute for work. Drills in metal or wood. Lots of power, wire brushes, sanders, buffers, etc. Westinghouse Motor. Full ball bearing spindle. drill to have around. None better is made. l4-inch general drilling in steel, overall length 1134 iny Products of the weight 444 lbs. Price only $24.00. voltage in eoderiog, No. 1051—110 volts; No. 2051—220 volts ciate bein CO., Greenfield, Mass., U. S. A. Chicago Office 38 No. Clinton St. Will operate grinding and polishing wheels, Long life. or write to us. London Office New York Office 127 Queen Victoria St 107 Lafayette St.

Wil eo moan’ s7<3 so

| (_ aaeenemeN | aes —

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Machines A Steady Income Start your own Busi- ness with this NEW Low- Priced Elec- tric Woodworker. Circular Saw in One Band Saw Performs 35 Woodworking Operations. The Electric Carpenter Runs from any Light Socket You can earn good profits ... in spare time or full time ... making screens, storm sash, mouldings, cabinet work, mill work, etc, Performs evecy woodworking operation with speed and accuracy ... Mitering, shaping, mortising, tenoning, paneling, rabbeting, boring, sanding, etc. WRITE TODAY $2,425, 41 THE WOODWORKING MACHINERY CO., INC. Eleventh and Vine Sts., Philadelphia, Pa. Write with electricity any name or design on the instruments. Interesting illustrated circular free. Write TECT YOUR TOOLS FROM THEFT jest i tools and . Or any metal, like writing on with pen or il. today. jents wanted. MKOGHAP PeA_CO.~1171 €. Stark St. Portland. Orem ETC ET | / BETTER GIFTS for \ Christmas. Practical GERSTNER Tool Chests are practical. desirable, and ideal. TOOLMAKERS and MACHINISTS, choose your own cifts from our Free Catalog A Scostner Sem 472 Columbia Street, Dayton, Ohio / Shaw Mig. Co., dept. pmi2, Galesburg, Kan. CALCULATIONS in Office, School, Store and Shop can be instant! made with the Midget Slide ‘Role. It gives pid answer to any problem involving fractions, mixed- figures on white celluloid. Sise > Price with Instruction Book,$1.80. Fabrikoid Case extra. Catalogue Free. Sent C. O. D. if desired Your money back tf you are not satisfied. GILSON SLIDE RULE CO., Stuart, Fia. Makes Old Ford a Tractor Now you can convert that old Ford ».¥*ss>Ply 3 car into a useful farm tractor without altering any Ford parts. We furnish the traction wheels, drive gears and auxiliary axle and mountings, read toclamp on to the Ford frame. Pul 16” plow. Belt Pulley also Write for Free Particulars. POPULAR MECHANICS ADVERTISING SECTION KO ae as F AK poms your plant ? Let “Red Streak”? Hack Saws prove they out-perform any blade you’ve ever used, Waen you have a metal cutting job, you want it done as quickly and as easily as possible . . . you want the easiest and fastest cutting hack saw on the market. You want “Red Streak”? Hack Saw Blades! Mechanics in all types of trades praise the improved cutting qualities in “Red Streak” Blades. Electric furnace steel] makes “Red Streaks” wear-resist- ing. Evenly set teeth make the cut go straight. They’re made for those who handle a hack saw roughly. Test the “Red Streak” in your hack saw frame and you'll be a booster, too. Look for the blade with the red end. SIMONDS SAW AND STEEL COMPANY FITCHBURG, MASS. “The Saw Makers” ent Like lightnina RED STREAKS Established 1832 Branch Offices and Service Shops in Principal Cities

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148 ATKINS 400” “401” Hand Saws ATKINS “* Junior Mechanic” Hand Saws ATKINS Back Saws ATKINS Hack Saw Frames and Blades At your Hardware Store. POPULAR MECHANICS ADVERTISING SECTION Mr. Happy-Man Says:— “Give HIM an ATKINS Saw for His Home— Shop or Tool Kit” T’S not a bit too early to select HIS Christmas gift at your Hardware Store, NOW! For the man who is handy with tools, there’s no finer gift than an ATKINS “400” or “401” Hand Saw. Its “Silver Steel’”’ blade will cut faster and easier than any other saw he ever used; its Perfection Handle gives the saw balance, beauty, and eliminates all wrist strain. He’ll use and appreciate one of these famous saws, for a lifetime. For boys who like tools, an ATKINS “Junior Mechanic’ Hand Saw is the ideal gift. A really good saw, with a 20-inch blade. Dozens of other fine ATKINS Saws for home craftsmen! Hack Saw Frames, with “Silver Steel” Blades, which cut TWICE as fast, and last six times as long. Back Saws for fine work. Compass and Keyhole Saws. Circular Saws. Band Saws. Cabinet Scrapers, Saw Filers, Saw Sets, Files, etc. Every tool user should have the four SAW BOOKLETS shown below. They’re free. Send coupon. ATKINS s::: SAWS GET THESE SAW BOOKS FREE Ca “a y" E.C.ATKINS & CO. 4 Est.1857 426 S. Ulinois St. Indianapolis, Ind. Send “Saws in the Home,” “Circulat Saws,” “Dado Heads,” and “Saw nse”’; also information on your offer to pay $10 for best home workshop photo. THRO eee meee eee meee nesses eseseee® THROM e eee ee eee eeeeeeeseeereeeeeee® PLIERS -for radio work \| You'll find there is a Crescent- \eo5 Smith & Hemenway Plier for . \@ every phase of radio and electri- 942~— cal work. Long, slim ‘noses for hard-to-reach places, keen diag- onal cutters for skinning and ,X°- cutting wire, and many others 5’ for general work—all with char- acteristic Crescent easy action, dependability and long life. See them at your hardware dealer's. CRESCENT TOOL COMPANY 210 Harrison Street Jamestown, N. Y. CRESCENT fféxenway TOOLS | Catalog on request f {i | ines & Motors Bi Catalog No. 30 Illustrating Electrical, Mechani- cal and Model Maker's Supplies, Small Steam & Gasoline Engines. Motors. Generators, Lathes. Drill Presses, Bench and Band Saws, etc., 16-32 & 64 Watt Dyna-Motors, School Projects, Engine Castings, Motor Parts, etc., Books, Blue prints, Brass and Steel Tubing, Gears, Pulleys, Hongess, Expesimentel Material. an lor Copy. Mailed anyw ‘or conta, cents , refunded first order. LOOMIS ELECTRIC & MFC. CO. 2822 N. CALIFORNIA AVE. CHICAGO, TLL Chester! ield |] The MILD cigarette that SATISFIES ALL FUEL—ALL PURPOSE—POWER Inventive skiil coupled with mechanical perfection has produced in this wonderful engine the most reliable power for every need of home, farm, shop or mill. Runs as efficiently on cheap fuels as on gasoline—a big saving factor. All parts interchangeable — no costly repairs. A Witte unit pays dividends from the start. Put one to work now! Ask your dealer or write us for free catalog WITTE ENGINE WORKS Kansas City, Mo. ENGINE BUILDERS SINCE 1870 A Co that thin; has 1 rigidi work Utilit

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| ~~ nm 7 dod Fi od Ld as er as rit POPULAR MECHANICS ADVERTISING SECTION £ IR = if O N —the KING of them all UTILITOOL A Workshop ‘You Don’t Need to Coddle A WORKSHOP that won’t do all that you want it to do is, after all, only an expensive play- thing. Make sure before you buy that the outfit you choose has the power to handle any load within its capacity; and the rigidity, strength and precision construction essential to fast and accurate workmanship. Then your choice unquestionably will be the Ar-Con Utilitool—the werkshop that means satisfaction with every job you do. Free Trial! Easy Terms! Mail the coupon now for fully illustrated de- scriptive circular, together with details of our 10-day free trial offer and liberal time pay- ments applying to the complete outfit or any unit or combination of units you may desire. eee ae ee ee | THE AR-CON TOOL CO. 5€¢ Fassett St., Toledo, Ohio. Mail me complete information, prices and terms on | Ar-Con Utilitool with details of your free trial offer. THE AR-CON TOOL CO. TOLEDO, OHIO Exploding >» WEDGE:-:: Big Money For splitting Logs, Rails, Pit For Agents Posts, Fence Posts, Cord Wood, iP ] ete. Will do more work than ten ‘ é y & men. Willsplit any log up to Rail Lengths, no matter how large or tough. Pays for itself in a few hours. Satistaction guaranteed or money refunded. EXPLODING Parcel Post prepaid to any address in U. 8.— CH LL $5.00. Send money order, check or cash to ‘actory.W al Offer and F Book ** ro hae net BELSAW MACHINERY CO. PLEASANT HILL, MO. Andy Sannella Talks to Reed Players. Get this Free Book! On the air tonight, and ev night, Andy Sannella is earning a fabulous salary with his Selmer Sax. In his book of ““Advice to Saxophone Players’’ he gives more than in ten private Eo ave. Send a postal today a) If you will mention the in- Alexandre Reeds. They Play! CORNWELL CATALOG -FREE This book is free to all reed Published in English and Spanish Qy © your copy. No obligation. The Cornwell Quatiey Ze a Co., hio) iq strument you play, we will Send me new illustrated catalog with prices on full line of CORN- sf send also, free semple of our WELL Handmade " Tools. 58 SELMER BUILDING, ELKHART, INDIANA . aa Name al ET Pe ee ee ee of the NOWN throughout the world for their ———, ear pS and amazing a - ormance, CORNWELL tools are pri mechanics everywhere. They accomplish re- markable results under the most adverse condi- tions and do work that no other tools will do. They are made by our —_ Cc i co L proc- esses, which insure their unvarying quality. There Is No Substitute for Cornwell Quality Mechanics are amazed at the startling tests which demonstrate the superior quality of CORNWELL tools. Your money back if any tools fail to do what we claim. We Stand the Risk You are fully protected by our guarantee that covers every tool. You lake no risk, If ja are not exactly as represented the: back and we will refund your money. In Canada: 516 Yonge St., Toronto

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150 POPULAR MECHANICS ADVERTISING SECTION

i

Mand ten oa! The grocer or druggist. What? A dime. Why? ‘ For a cake of Lava Soap that’ll get the grimiest hands clean in 58 seconds. You can see the pulverized Italian pumice in Lava Soap drag out the dirt, but you can’t feel it. Lava makes a rich, creamy, penetrating lather in the hardest water. But it won’t harm your skin. It’s the busiest hand cleaner you’ve ever tried. George Lee fave Soop Man Lava costs a dime (or 6c for the medium size cake) at any drug or grocery store. But if you want to try it at our expense, mail this coupon. Procter & Gamble, Dept. W-1229 Cincinnati, Ohio George: I want a free sample cake of your Lava Soap.

Reduced Factory Price Lower terms—year to emg Choice of 5 colors in New § Porcelain Enamel Ranges. New wie me Heaters— & $34.75 up. 200 styles and sizes. Cash or 4 easy terms. 24-hour ship- Furnaces $5 g*

| isfaction guaranteed. 29 years in business. 750,000 customers. Write today for FREE book. KALAMAZOO STOVE CO. 391 Rochester Ave. Kalamazoo, Mich. “A Kalamazoo ° Direct to You” @ Make Big ® Money BUILD BIRD HOUSES Boys! pany A — pooney maker. With simple in- wtructions boy uild and erect Grandpa. nd Bones. They sell at $2 to $97. Soench: $2,000 worth sold in Oak Park, Tll., in one year — s bt 16 Bive ‘Print Drawings show: is correet building build my famous — houses. Valuabie’ et = 5 ton birds eye tips and advice making sales wong birds — act Now — Today, GEO. J. BREIDERT, 1040 “N. Elmwood ten, Oak Park, tl.

NEW VEST POCKET

ADDING MACHINE MUL DIVIDES por“ work so $300 machine. Guaranteed 5 years Made or steel and indestructible. Million ha } es. . : = simple child can operate it. Instructions fur- Trey te Dished. Everybody should carry one for figuring. TRIAL Weed

Sdditional in Leatherette Case. If not satisfied after 10 in a ‘ou usta” money back. THOUSANDS OF BATI teed Ev lowest priced tieal caleulator made. “Why pay more for inferior tations?” Order from this ad. -——=—a => if £3 || am, | oll

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POPULAR MECHANICS ADVERTISING SECTION Model 2. Racing T: 24 im. wi (West of Mise $228) Compete and Win with the “SILVER ARROW” Beat the other fellows! With this plane you can con- fidently get into com tition with boys who have other planes, and consistently win the contest. Here's a plane that flies—flies!!—not just once or sometimes, but repeat- edly. Fool-proof, trouble proof, it does not disappoint you. More flights, too, because it’s durable—built to stand rough usage. Launches by hand or “taxies’’ aad “takes a Zooms way over the housetops on long continuous flights. Not a construction toy but a fully built plane. A few moments to assemble and it’s ready to fly. Designed by Charles H. Grant, one of the foremost pioneer designers and builders of model airplanes in the United States. That's the reason! New expert construction. Wings and body of light Balsa wood reinforced with atuminues races; aluminum propeller; strong elastic motor. Du- rable, stable and beautifully “finished.”’ Three models: No. 1, Racing Type, 18 in. wing spread, $1.00; No. 2, Racing, Type, 24 in. wing spread, $2.00; No. 21, Cabin 288 2 in. wing spread, $2.50. (West of Miss., $1.10, $2.20. $2. 75.) Get the plane that really flies—all the time. If your dealer hasn't the a vet thriller, order Girect- Kingsbury Mfg. Co., 83M yrtie St., Keene, N. KINGSBURY 227% TOYS Send 10c for this Eraser: A steel disc wheel from a aC, tire of solid eraser rubber. Set of four, 35c. Toy Kingsbury Toy P catalog free. with a ‘balloon Agents#@ aDay Build a permanent business with regular customers and big repeat orders every week. 300 high-quality Household Socnmaeaen at low prices. fast sellers. Easy to make $6 to $9 profit in a + Nodull seasons. Steady income all year ‘round. $83 FIRST § DAYS That's what Baumann made. Mrs.Hodges makes $18 to $20 2 a day. Tr MT gt yous same opportunity. No capital need New Ford Tudor Sedan offered as bonus, in addition to your big cash profits. Write today! ALBERT SAILS. Pres Av>.. D _—_ J $11 up, 1 Rotary #18 Will'do popular Raised Printing like like fa y rules sent. for a. THE is Ease eee Meridon, Conn. Greatest Value Ever Offered $ MACOY’S sumom * DL Morocco Goatskin Well made in every way. Edges turned and stitched; ket for business cards; 4d emblem if desired. Gold ping, name and address, 35c per line a Clip thisadv. andenciose $1 bill. 4 Enclose another dollar for beautifut solid gold Masonic Pin (illustrated). Catalogs Masonic Books; Jenelry: Novelties; Leather Goods; for X Xmas gifts. State one wanted. PUB. & MASONI PPLY le MACOY it'w. Sina'st (ea. 10), New York Christmas Gift Brings You Popularity "TPrhousands will start toward musical success on Conns this Christmas. The one gift that brings you fun. popularity and endless chancestomake extra money. Join a band or orchestra. It’s easy. Anyone who can whistle a tune can learn quickly. Easy to Play Saxophone, Cornet, Clarinet, Trump- et, Trombone—any ; band or orchestra instrument you choose. Conn makes them all. And Conns are easiest of all to play. The choice of Sousa and the world’s greatest artists. Especially re- commended to beginners for quick peogsess. Easiest to blow. Easiest to nger. Easiest to play in perfect tune. The result of more than 50 years’ ex- perience and patented processes of manufacture exclusive with Conn — the world’s largest maker. Y et a gen- uine Conn costs you no more than any so called standard make. FREE TRIAL, Easy Payments Any instrument sent for free trial in your own home. Easy payments if you Write for FREE BOOK Write now for interesting booklet illustra- ting the latest models in colors. Tells everything you want to know about your favorite instrument. *.ention instrument. BAND INSTRUMENTS es Amwes) manner Ree New Era Trumpet me eee Cc. G. CONN, LTD., 1231 Conn Bidg., Elkhart, Indiana §§ Gentlemen : Send free literature and details of free trial offer on ? ....~ (Instrument)

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"A NEW BUSINESS IN YOUR TOWN ral Snap oe ty ce and fascinating business. ttes. Delicious confection. Young and o oid Se them. oe nonin and — be ent om ~~ ma s ing. phen ial plentifu \ >rofite von b No tows too small. Start now. QUICK SUCCESS POSSIBLE eee, crowded streets; surgi a little retail store; or, bakers, POPULAR MECHANICS ADVERTISING SECTION throngs at parks, carnivals, fairs, etc.; open druggists, parks, EXCEPTIONAL (,,2°5 California man. New Jerse in at home; wholesale to stores, grocers, ball games, picnics, wayside stands. 11, 1 ox), PROFITS ovis reported’ by ts in less than 2 months. Revel of Michigan wrote: Chante 92 $2: rs ay first day’. A. Leib of Montreal wrote: “My sales averaged $400 per wee! * littl s | WE START YOU IN BUSINESS {°",!'tt'2 money, Supply rmulas, and raw material. Little capital starts you. No experience needed. ” WRITE FOR “BOOK OF FACTS ~ —It’s free, contains success letters from others—shows laces of business, tells how to start. their SALES” eg EAKINS CO 81 1228 High t., Springfield, Ohio MASSACHUSETTS Mail at once, your Book of Facts & as AVERAGING $3000°° PROFIT FOR 3 SUMMER MONTHS Report July 241929 ER NABOR Address... STICKS *AN has magnetized base. Stickstighttoa paemorane. Ideal ha res nds free! A eal Auto “Trouble Ligh Attached in cosonaet . c 5 Leaves \ No batteries to weer out. Gives powerful shield-nes \ —— . Protected bulb. Alsoserves_,, AGENTS MAKE 50 TO $100 WEEKLY FF lis atsight. Every autoist,garage man, repair man a Eressect. Sells at only $3.60. W. Miller: ** in one hour!’ C.H. Streator: ““ mp ooe Week ener, af any a ™ nd for sample \ 10 Day Trial special Agents price of $2.00 C.0.D. 10 Day trial. Also detai of ee making Tiadatactio car. You Need This~ COMPLETE HOME GYMNASIUM It gives you facilities at home for playful, health-building exercise — to strengthen weak muscles—to reduce flesh—to keep vigorous and physically contented while indoors. Fits in 34x4Mit. floor space—it is so compact. Is of durable tubular metal construction, at- tractively finished. Hundreds have been pur- chased and set up in dens, bedrooms, base- ments, sleeping porches, attics, garages, play- rooms, etc. GY UNIOR Petented Ghe }fome Gymnasium Reasonably priced — and obtainable on easy payment plan. Rowing Machine Chest Weights Parallel Bars Wrist Developer Massage Reducer Chinning Bar Swimming Machine b wat Ladder GYM JUNIOR CO. 530 Gregory Ave. WEEHAWKEN, N. J. l2- INCH SCALE MOD Lind 5 Bae of St. Louis. Botentineal d and very = fons ground by o ae. R, - flies 40 ft. of more. Only & bebe scale model sold at thie price. Easily bah 2or Jhouts. No tools eodal Construction| Sed deodwerr tow New . Get Fre ie Book, 100 Home H Oo M ES Plans, wholesale, mills-to- you prices, and our 15-year Payment Plan. Write GORDON-VAN TINE .,3°%,, Davenport, lowa ne, C0) 6) ok For Making Toy Soldiers. Indtans, Cowboys Animalsefe. With om Mould you can make many HUNDREDS OF CASTINGS, whole Armies. Outfits, including material for casting, enamel paints and every thing complete,!$4.50. Easy enough for any boy to make and great fun for grown-ups. Sport for the whole family. Write for illustrations of dozens of patterns you can make. MAKE-A-TOY COMPANY, Dept. E, 1696 Boston Road, N. Y. CITY i | Yor wri 192 YE. Tris Wr

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POPULAR MECHANICS ADVERTISING SECTION 153 — - ) A and this machine out can make anything wnyracrousnce! The SAFETY-SAW money on toy machines when you can get this real rig at MODEL N ice? Easy to operat such a low price? Beer fon e RIPS...MITERS... wees See 18"x 14" eco I SEVELS. .DADOSS. Rg level, as PLOUGHS... $4qso Cur 244" Thick 2 GROOVES... F Rips 12" Wide RABBETS... without — Cross-cuts any width a SANDS... s Bevel Rips to 45° BORES... Send C GRINDS... Now for Detaths POLISHES... ETC. i Illustrations and . EASY TERMS : TRY THIS Safety-Saw AT OUR EXPENSE ( 2 Put this machine on your work bench . . . give it a thorough Oy " test. .. compare it with others ...and then if you’re not more SAFE TOOL MFG. CO., Bridgeport,Pa. ; can ied wih in evry wa send back and well | Pieue end me fll information shout you portation charges both ways. You can’t lose a nickel, but you woodworking machines. can gain a lot. Don’t buy any machine until you've read our FREE descriptive folder . . .It shows Bench Saws .. . Band Pe sniectacencintinninsdbhienaciaiiainnnsencaate Saws... Lathes... Jointers ... and all equipment. aaa ee ee See een SAFE TOOL MFG. CO. . . BRIDGEPORT, PA. 3) ELE TO Let us recommend the best books to study ) a SE Cae) on any subject. Popular Mechanics Press, a. FIRE EXTINGUISHER Chicago, Illinois / ARTISTIC PORTRAIT ENLARGEMENTS AGENTS Profit) Boge come sror. GENUINE GOLD LEAF LETTERS ir ed Tue babel price of this work Unusual 0} for live agents in every \~~4 &. & Make $5, bob or more & year—easily. Fugo ic fire extinguisher : —is needed and wanted in every home, store, the- w atre, garage, shop, school, automobile, etc. Chea est fire protection available today. Within reach of all. 1 Qt. Size $5.00 2 Qt. Size $7.50 Recharged in a jiffy 30-seeond onstration tome sale—each one sold bs Territory gomg fast Write at once for wonderful ion that will MAKE YOU BIG MONEY. The National Formetal Co., 6535 Metta Ave., Cleveland, Ohio . ¢ advan- guaranteed to never tarnish. Anyone can put them oe ww: hag T= — on stores and office windows. [Enormous demand, : a beautiful ~F like enlarge- ome lange pea. Paul Clark says: Smallest day $28.70. of mother, -to- R. L. Reel made $920 in two =. Write today : for free sample and liberal offer to general agents. mail 4-4 size rite METALLIC aa CO. 433-8 N. Clark 90 CHICAGO . I r send ith and.we pay postage. i ited. your most will be returned to you unharmed. ise this remarkable Hand action , mi are your « le ALTON ART STUDIO, Dept. 46 Cepek Size 5654 West Lake St., Chicago, i. 10 Day FREE Trial Please enlarwe photo, | Oi 8x6 m. wrteny & $1 gf down. Lowest orice ever ptered! “Sawitat terme A ite Pt you are Te oted Ta Fh 4 - A — roe Years" down and we ship. No delay. No red tape. 10 day Free Name. Write fects BE a paper Conese 7 s Tests. | Waterproof Cover if you act now Smith Typewriter Sales Corp., 11-€- 459 E. Ohio St, Chicago, til. Town State ==

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POPULAR MECHANICS ADVERTISING SECTION Build these of metal yourself! Be up-to-date! The latest airplanes, trucks, etc., are of ALi- METAL construction. Build your models that same way! Working with metal is fascinati fun. It’s easy to make an all-metal monoplane mode’ like the “Spirit of St. Louis” or an all-metal model army truck with the complete Plans and Instructions we give you FREE All the materials you need are tin, wire and solder. You can get these anywhere and soldering is made simple with Kester Metal Mender—the genuine wire solder with the flux right inside. We send you a FREE sample to use. There’s a new thrill for you in building things of metal. Win a Metalcraft Merit Medal! Be the Srstin our neighborhood! Just write today for FREE Plans and Instructions and we'll mail you full par- ticulars about the Medal Awards with them. Be sure to state your age and address. KESTER SOLDER COMPANY Formerly Chicago Solider Company 4212-04 Wrightwood Ave., Chicago Makers of Kester Metal Mender Established 1899 attendto? Then become DO YOU 2222 in a few weeks earn big income in service fees,—not medical nor chiropody—easy terms for home training, no further capital needed, no goods to buy, no agency. Address Stephenson Laboratory, 1 pack Bay, Boston, Mass. WANT a new business profession of your own, with all the trade you can FLY THIS COMBAT MONOPLANE! This realistic covy of a military fal fecr, Wine svread’ {8 in. Weight only 7/8 oz. Will take off wn and fly over 8v ft. ferkings in red and blue. Can itruc' se! 5 \ aluminum lier with shaft, / Me ‘ood 8 ee. yo “shear direc breakable container. only $1.00. postpaid in U. Sand & The MIDLAND MODEL WORKS, Chillicothe, Ohio (Wecannot make C.O.D. shipments. No retail catalogue issued.) World’s finest outboard motor. Four cylinders. Powerful, vibrationless, easy starting. The motor for fastest racers, luxurious runabouts, com- fortable cruisers. Send for Catalog. ELTO DIVISION, Outboard M Corporation, Ma- son Street, Dept. AA, Milwaukee. _@ MOTORCYCLES Wo WE WILL TRUST YOU Pay As Low As $2.00 per Week Hendersons, Harley -Davidsons, Indians Slightly used and rebuilt. Hundreds to select from. Send 10c for list today. MYEROW BROS. CO., 15 Berkeley St., Boston, Mass., U.S. A. Your FORD Into The ‘“‘ACE” $599 Red-i-Kut life size patterms Prvtcrns und potire tance ie os lass—Snap pew tes > ig convert rome Ford into this Fas aucy, Sport-C: thousands have done with caaily i tained materials. N indshields and man ORDER RIGHT thrill. 1OwaA IND SOcIN STAMPS FOR CATALOGUES pes eee 7 bicye Eels, Mink, Muskrats with our new folding galvanized STEEL WIRETRAP. Write for our FREE TRAP OFFER and Bargain Catalog. $1 Box of our famous Fish Bait FREE to introduce our traps. WALTON SUPPLY CO., 3502 JUNIATA AVE., ST. LOUIS, MO. TOO. fora own thse stot matic. Use for or def. .K RIDGEStramps, frightens loves, Given! Freer ao —— icitve ceeeees ecironet loading and ejection of cartridges, instant pow- Gua a! wa erful report ec. mon. Pay on “oliver 44't0 > ~ ippii a —~ 100 JENKINS, 683 Broadway, New York, Dept. t2-i-23

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POPULAR MECHANICS ADVERTISING SECTION 155 Campbell’s ,/-46> Relieves Infra-Red ( - . © Pain re Lamp > \. Quickly a Write for Factory Price "30 Days Home Trial Relieve That Troublesome Ailment Write at once and let me tell you how to relieve that troublesome ailment with Infra-Red treatments in your own home, The Campbell Infra-Red Ray Lamp throws out mild beams of Infra-Red Rays which penetrate deeply into the tissues and bring a soothing internal heat—best, because it works where ” congestion is, and restores active blood circulation. Medical authorities say most ailments are due to congestion—relieve the congestion and you relieve the ailment because nature itself does the Seaton through active, normal blood circulation. Why Suffer Needless Pain? Are you troubled with Sinus Irritation, Sore Throat, Neuralgia, Bronchitis, Rheumatism, Neuritis, Lum- bago, Tonsilitis, Catarrh, Ear Trouble, Gall Bladder trouble or similar ailments? Just let me send you this wonderful lamp on approval. Use thirty days according to directions and see if it does not bring you wonderful results. Harmiless You or anyone in your home can use the lamp on instant notice. It is on an adjust- able stand—easily carried to any room—easily placed in any position. Leading health authorities recommend it. Letters from satisfied users everywhere tell of wonderful results. Just a few treatments will surprise you. First cost only cost. Connect with any electric light socket. Easy Payments Shipped by parcel post or express direct to you from factory at lowest cost. Don’t delay—if you or some friend have some troublesome ail- ment. Write and let me send it at once. Get Our Book on Infra-Red Rays This book quotes leading. medical authorities and hundreds of users. Mention your ailment when writing and we will send you free valuable suggestions on how to treat it with Infra-Red Rays. Thirty day trial period. WILLIAM CAMPBELL CO. Dept. 1040 ALLIANCE, OHIO 1"? : aes Stop being shy, 2 ee caneere. Conquer it our faite easily _ twigs oon oun onbey Hest ore ake! Send 25c for for this amazing book, RICHARD BLACKSTONE, Ba-473 12 Flatiron Bidg., N. Y. At last—the end of tedious, time- wasting flour-sifters. This great in- vention holds the flour while you sift. No need to pour and re-pour BA AS a F U Ki: ‘cae SIF" WAY TO from dish to sifter and back again. No muss or waste flour. Lighter, fluffy cakes assured in 6 Hours is agents Profit Montgomery made $54 in6 hours. ° A Bargain at $42 Imported French Binoculars — Never before ofiered at our special price. Powerful lenses. Magnifies vision many times. Solid metal, elegantly finished Complete with carrying case and~ genuine leather straps. Ideal for gifts. A real buy at our _apecial rice of $4.69. Worth Mrs. Lobrman writes “They sell themselves." Men and women delivery $4.69 end. ‘posta t. - oe: ay agents wanted. Get liberal sample JENKINS, Dept. 12-023, 685 Broadway, N. Y. offer. Kwik Factories, 718Kelmar enue, Dept. .

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156 eee ee POPULAR MECHANICS ADVERTISING. SECTION Protect Your Ideas Take the First Step Today If you have a useful, practical, novel idea for any new article or for an improvement on an old one, you should communicate with a competent Registered Patent Attorney AT ONCE. Every year thousands of appli- cations for patents are filed in the U. S. Patent Office. Frequently two or more applications are made for the same or substantially the same idea (even though the inventors may live in different sections of the country and be entirely unknown to one another). In such a case, the burden of proof rests upon the last application filed. Delays of even a few days in filing the application sometimes mean the loss of a patent. So lose no time. Get in touch with me at once by mailing the coupon on the opposite page. Frompt, Careful, Efficient Service This large, experienced organization devotes its entire time and attention to patent and trade mark cases. Our offices are directly across the street from the U. S. Patent Office. We understand the technicalities of patent law. We know the rules and requirements of the Patent Office. We can proceed in the quickest, safest and best ways in preparing an application for a patent covering your idea. Our success has been built on the strength of careful, efficient, satisfactory service to inventors and trademark owners located in every state in the Union. NO CHARGE for Information On How to Proceed The booklet shown here contains valuable information relating to patent procedure that every inventor should have. And with it I will also send you my “Record of Invention” form on which you can sketch your idea and establish its date before a witness. Such evidence may later prove valuable to you. Simply mail the coupon and I will send you the booklet, and the “Record of Invention” form, together with detailed information on how to proceed and the costs involved. Do this NOW. No need to lose a minute’s time. The coupon will bring you complete information entirely without charge or obligation. My P Jus Stre U.S.1 All are aut wri the u Me Col Col C

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POPULAR MECHANICS ADVERTISING SECTION T f i nvuentlors XY Unite for thee , Free where a ae staff of ex- Strict Secrecy Preserved All communications, sketches, drawings, etc., My Patent Law Offices Just Across Street From U.S. Pat. Office perienced experts are in my constant employ. All drawings and specifications are prepar be - under person Tf are held in strictest confidence in strong, steel, fireproof files, which are accessible only to authorized members of my staff. Feel free to write me fully and frankly. It is probable that I can help you. Highest references. But FIRST—clip the coupon and get my free book. Do THAT right now. supervision. Clarence A. O’Brien Registered Patent Attorney & Attorney-at-Law Member of Bar of: Supreme Court of the United States; Court of Appeals, District of Columbia; Supreme Court, District of Columbia; United States Court of Claims. Practice confined exclusively to Patents, Trademarks and Copyrights ae » Clip this Coupon wi Mail it 2Zow/ CLARENCE A. O’BRIEN, Registered Patent Attorney & Attorney-at-Law 70-Y Security Savings and OR | Suite 1106 Woolworth Bidg., Commercial Bank Bidg¢., New York City Washington, D. C. Please send me your free book, “ How to Obtain a Patent,” and your “ Record of Invention” form without any cost or obligation on my part. (Important—Write plainly and address office nearest you) STR: SN sm cC RRR

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POPULAR MECHANICS ADVERTISING SECTION VICTOR BUILDING Stes: ‘ice Specially Erected by Us for T TRADE MARKS COPY RIGHTS Have You An Idea? Our Offers OF your INVENTION YOUR FIRST STEP The inventor should write for our blank form “RECORD of INVENTION’’ This should be signed and witnessed and returned to us together with model or sketch and description of the invention for INSPECTION AND ADVICE No Charge for the Above Information Our Five Books Mailed Free to Inventors Our Illustrated Guide BOOK How toObtaina Patent Contains full instructions regarding U. S. Patents. Our Methods, Terms, and 100 Mechanical Move- ments illustrated and described. Our Trade Mark Book Yo Shows value and necessity of Trade Mark Protec- tion. Information regarding Trade Marks and un- fair competition in trade. Our Foreign Book We have Direct Agencies in ForeignCountries,and se- cure Foreign Patents in shortest time and lowest cost. Progress of Invention Description of World’s Most Pressing Prob- lems by Leading Scientists and Inventors. Payment of Fees in Installments It is not necessary that the total cost for the preparation and rosecution of a patent be paid in one payment. Our custom is to permit our clients to pay for their applications in three installments as the preparation of the application progresses in our office. This plan makes the payments easy for the inventor. We Regard a Satisfied Client as our best advertise- ment, and furnish anyone, upon request, lists of clients in any state for whom we have secured patents. Highest References—Prompt Service —Reasonable Terms VICTOR J.EVANS & CO. Patent Attorneys, Established in 1898 Main Offices: 789 9th St., N. W., Washington, D. C. Nearly Opposite U. S. Patent Office ween) ee OY 8 OD ALA it een |

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POPULAR MECHANICS ADVERTISING SECTION ELAYS ARE DANGEROUS IN PATENT MATTERS IMPORTANT! To Avoid Delay! YOU SHOULD HAVE YOUR CASE MADE SPECIAL IN OUR OFFICE to save correspondence, secure protection and early filing date in the Patent Office. To secure special prep- aration of your case send $25.00 on account with model or sketch and description of invention. ACT NOW—Often two or more inventors file applications for practically the same idea. In such cases the burden of proof rests upon the last appli- cation filed. Therefore, delays often cause the loss of a patent. MAIN OFFICE, VICTOR J. EVANS & CO.—VICTOR BUILDING, WASHINGTON, c. Our Large, Comprehensive Organization has been established for 30 years and offers Prompt, Efficient and Personal Service by experienced Patent Lawyers and Draftsmen. Every case is in charge of a oe who has been selected for his knowledge and experience in certain lines of invention. Our Lawyers practice in all U. S. Courts and defend clients in suits involv- ing Patents, Trademarks and Copyrights. All Communications and Data strictly Secret and Confidential. We shall be glad to have you consult us or to answer any questions in regard to Patents, Trademarks or Copyrights without charge or obligation. : ee ea conren | VICTOR J. EVANS & CO. | COUPON | PATENT ATTORNEYS ali NEW YORK OFFICES CHICAGO OFFICES 1007 Woolworth Bidg. Suite 1640-42 Conwa " | PHILADELPHIA OFFICES PITTSBURGH OFFICES SAN FRANCISCO OFFIC 828 Fidelity Phila. Trust Bidg. 514 Empire Bidg. 1010 Hobart Bidg. MAIN OFFICES: 789-9th Street, N. W., WASHINGTON, D. C. Gentlemen: Please send me Free of Charge your books as described on preceding page.

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} 160 POPULAR MECHANICS ADVERTISING. SECTION PATENTS TRADE-MARKS * DESIGNS FOREIGN PATENTS MUNN @& CO. PATENT ATTORNEYS Associated since 1846 with the Scientific American SCIENTIFIC AMERICAN BUILDING 625 F Street, Washington, D. C. 1303 TOWER BUILDING Cerner of Michigan Blvd. and Madison St Chicago, Il. 1551 SCIENTIFIC AMERICAN BUILDING 24 West 40th Street, New York City HOBART BUILDING 582 Market Street San Francisco, Calif. 511 VAN Nuys BUILDING Spring and Seventh Streets, Los Angeles, Calif. og Books and Information on Patents and Trade-Marks by Request. Associates in All Foreign Countries. 165,000 REWARD FOR AN IDEA That sum was paid to the inventor of “Kiddie Kars.”’ Here is a remarkable book which. tells you what inventions are NEEDED in every field. today for 1000 NEEDED INVENTIONS Prepared by Raymond F. Yates, famous inventor, former managing editor of Popular Science Monthly, who knows what manufacturers want. New, revised 1929 edition. This book may start you toward a fortune. Send no money. Just write a postcard. Pay mail man only $1.50 plus postage when book arrives. Money back after 10 days if desired. Limited offer.. Write now. Get started in right direction. (Outside U. S. $1.70 cash with order.) Bureau of Inventive Science, 312 Wisner Bidg., Rochester, N. Y Don't waste your ideas. Send PATENT uwventions EDWARD GOTTLIEB Attorney in Patent Causes 5 Beekman Street New York Inventions Developed—Representatives for BLAIR TOOL AND MACHINE CcoRP. INVENTORS “cobain PATENTS and pay for them on the basis of DEFERRED PAYMENTS INVENTORS SERVICE. BUREAU Dept. B, Union Trust Building, Washington, D. C. PATENTS |PROTECT YOUR IDEAS) Write today for FREE INSTRUC- TIONS—or send Drawing or Model of your Invention for Examination. Promptness Assured with Best Results CARL MILLER REGISTERED PATENT ATTORNEY Former Member Examining Corps U. S. Patent Office 255 McGill Building Washington, D. C. PATENTS TRADE-MARKS Don’t Lose Your Rights To Patent Protection Before disclosing your invention to anyone send for blank form “EVIDENCE OF CONCEPTION to be signed and witnessed. LANCASTER & ALLWINE 480 Ouray Bidg. Lng 7 Saath DB. Cc. Originators Sof forms “Evtdence of Concepti a icez OC pee | eee eee

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POPULAR MECHANICS ADVERTISING SECTION Booklet Free Highest References a A a yy ; Promptness Assured Best Results Send on, or oe pedal See for preliminary advice. ALL BUSINESS GIVEN PROMPT AND PROPER ATTENTION Listed Patent Lawyer in the latest editions of the Rand-McNally Directory of Bankers and Bonded Attorneys, published by Rand-McNally & Co., Chicago, Ill.; The Baggott & Ryall Directory of Guaranteed Attorneys, published by by Legal Directory aa. Boston, Mass.; Flugel’s Law List, published by Legal Directory Publishing Co., teckene Lo Arrer. an Lawyers. Annual, ‘pu ublished in Cleveland, Ohio; Bankers Service Legal ublished by Boston, Mass.; Eyre’s Law List, 9 Park Place, New York City; oe Gn can Legal Eaeceners » Omaha, ‘Nebraska, and the National Directory of Attorneys, Baltimore, Maryland. WATS Oo N E. COLEMAN, WASHINGTON, D es REGISTERED PATENT LAWYER , D.C. PATENTS To the Man with an Idea PATENTS Procured. Trade Marks Registered. —A comprehensive, need, prompt eervice od the protection ~~ opment Nels our ideas. o—wy 2 --yJ- — furnish without eae let of Eformation and form for disclosing idea free on request. IRVING L. McCATHRAN, Patent Lawyer Formerly with and successor to RICHARD B.OWEN 704 International Bldg., Weshingten, D.C. 41-E Park Row, New York City TERMS IF DESIRED Don't let lack of ready money keep you from protecting the idea which may prove the turning point in your life. FORMER ASSISTANT EXAMINER OF U. S. PATENT OFFICE = now handle your patent matters on easy payments rite today for free information and particulars. M.S. CAYNE (Registered Patent Atterney) Main Offices BANKERS BLDG., 105 W. Adams st., CHICAGO (With Offices in Washington, D. C.) oe PATENTS—— ae ee | RADE - MARKS ALBERT E. DIETERICH *k formerly member Examining Corps U. S. Patent Office R a Gl RE e RED - PATENT LAWYER and SOLICITOR 20 ¥ 621-A, Ouray Bldg. Play S o Patents Trade Marks —— ears’ ence ashington, D.C. — Experi ————— Edward C. Sasnett firms in America we eve in Atty. at Law, Registered Patent Atty. a po ent | | Formerly @ Principal Examiner U. $. Patent Office well-known Patents of extracrdimary Valen "haan ty ee ky 516 McGill Bidg., Washington, D. C. Lacey & Lacey, 646 F St., Washington, D- ‘c. eich ‘Tse Personal Service $10.00 PER MONTH BUYS Fibre-Life Limbs ESS Let us recommend the best books to study NEXT TO NATURE. BRACES MADE TO ORDER. AGENTS | on any subject. Popular Mechanics Press, — | font sampeee WORMAN CO, MINNEAPOLIS. MINN : Chicago, Illinois NVENTORS xcun we YOUR IDEAS Write for our Guide Book, “HOW TO GET YOUR PATENT,” and Evi- | dence of Invention Blank, sent Free. Tells our terms, methods, ete. rR ee odel or sketch and description of your invention for INSPECTION and INSTRUCTIONS Terms Reasonable. Best References. WRITE TODAY RANDOLPH & COMPANY, Patent Attorneys 301 VICTOR BUILDING, WASHINGTON, D. C. ea eR RS Are fe mk ep ed Se Bomy Address

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162 POPULAR MECHANICS ADVERTISING SECTION Turn a Corner of Your Shop into EXTRA MONEY with this Amazingly Simple Plan METALL, a Reflex Battery er. No attention re- tever. Wetks 24 to you. Steady profits year "round. No overhead. tteries charged for less than 6c apiece. Special Price to You Bateeny. Charger (any eines shipped te, you cirect from —4 Einnot Srathare’ ot dachare REFLEX perates on current. TTERY CHARG' Guaran |e hour installs GA vc ER it. We show you how. Write | 1 te 15 Battery Capacity TODAY! $ 00 This “New Model” on Comme SHR a down payment ee el it to Bala: terms. Satistaction Uarantesd er money back, Serine maki money imm tely. Low price, a of operation and life cannot be surpassed in any other make. Mail this Coupon for Complete Details Get detailed information today on this amazing Reflex Battery Charger. Quickly pays for itself. 10809 Berea Road, Cleveland, Ohio Gentlemen: Without obligation, send me complete details on the specially priced Reflex Battery Charger, explaining how I can ssteaed a battery charging service on a big, profit paying Now... THE Super Parasol Sea Plane Thus again the Super Fuinebs proves the Super power of the HEATH- Henderson combination. Fit pon- toons and fly your Super Parasol from the water. Complete pontoon equipment $200.00. Complete set pontoon blue prints $2.00. Send 10¢ in stamps or coin for large illustrated booklet describing Amer- ica’s most popular Sport Plane which you can build for $199.00. HEATH AIRPLANE COMPANY 1727-29 Sedgwick St., Dept. P-12, Chicago, Ill. ie s erauisite. Set le "i fi eh tna fine quality, full. | Srillianceof scintillating beau is 18 Karat real white gold, petty. Mounting . If you k ns re a wack f tor about one year th ic’ pontsonties— ie o orders uy ption so yoy can buy diamonds like an ex . Gives you information _—— welers dare not te Genuine B oe se a ag as 2 107.0 00 a 0a Carat, it brings our large wp dowreley Store right into your home. Gives i STERLING | een CP: **At61’’ “I thought I was through. I was half-living—getting up nights—con- stantly tormented with aches and pains. At 62 my condition became almost intolerable. Then at 63, I shook off 20 years almost overnight.” “How I Licked Wretched Old Age at 63” %, 65% of all men, the vital prostate gland slows up soon after 40. Pain may not ap- pear instantly. But gradually symptoms often develop that lead to sciatica, backache, blad- der weakness, constipation, etc. But now a new, safe way has been discovered by a simple home treatment to restore the prostzte to normal health. The reports on many cases are amazing. Many physicians use and recom- mend it. No drugs, medicine, surgery, or electric rays. FREE! A 24-page illustrated book fully de- scribes it. The edition is limited. Send for a free copy. very man past forty should know the meaning of these tee facts. Simply write The Electro Thermal Co., 2124 Morris Ave., Steubenville, Ohio. Western Address: Dept. 21-A, 303 Van Nuys Bidg., Los Angeles, Cal. Nor The Ld 4 _~ - a a fe 0 \ —

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POPULAR MECHANICS ADVERTISING SECTION 163 It makes no difference who you are or where you live, we want you to send us a name for this new and unusual shampoo. Whoever sends the most suitable name will win $1,000.00—nothing else $100 EXTRA FOR to do. Just write or-print the name on any kind of paper. PROMPTNESS | Neatness does not count. To get quick action we are going to pay NY AME MA the winner an extra $100.00 for prompt- A N ¥ WIN ness, or $1,100.00 in all—so send your No matter how simple you think your suggestion is, you can- suggestion AT ONCE! not afford to neglect sending it at once. Any name may win. The names of people, flowers, trees, birds, ete., may be sub- CONTEST RULES mitted for a name or you can send a coined word or a word This contest is open to everyone except mem- made by combining two or more words such as “‘Sun-gleam,” _ bers of this firm, its employees and relatives. **Youth-glow,” etc., or your name might suggest the handy new container, Each contestant may send only one name. our latest sanitary tube, from which the shampoo is simply squeezed out. Sending two or more names will cause all names No — oo, or spill, no cake ~ | soap to lie — — Sa submitted by that person to be thrown out. germs. othing safer or more sanitary and convenient for travel. ere . oses : : : is nothing more to do, simply the person sending the most suitable sug- Ne mg) oom yy = — Duplicate prises gestion fora name will receive $1,000.00 in cash or, if prompt, $1,100.00in all ¢ + To win the promptness prize of $100 extra, the Nothing to Buy—Nothing to Sell winning name suggested must be mailed within . three days after our announcement is read. Win po $1,000.00 oe prize by a few monenty Saat me Big go DEO RT IE ROI I LIES: SS CS earn this amount of money easier or more quickly? emember, there i is no obligation! The person submitting the winning name will have | PARIS AMERICAN yf my a? co., nothing else to do to win the $1,000.00 and the extra $100.00 if prompt, = PM McCune Bidg., loines, Iowa. there is nothing to buy or sell. Only one name will be accepted from | Enclosed with this coupon on separate sheet is ] each contestant. We are offering one hundred other big cash prizes ranging | my suggestion for a name. from $8,000.00 down as a part of our novel advertising plan to make the —— of the Paris American Pharmacal Company better known. | veryone sending us a name for our shampoo, regardless of whether it wins | or not, will be given an opportunity to win the $8,000.00 first prize or one of the other one hundred cash prizes. The winner of the $1,000.00 cash | Name.............ccccccccuccccccncceccccece l l Date this announcement wae read............... | —— ($1,100.00 in all if prompt) offered for a name for our shampoo may y participating in our other prize offers win an additional $8,000.00 or a total of $9,100.00. You have everything to gain and nothing to lose as it costs you nothing to send a name. Do it today. The very name you think least of may be the winner. RADIO CONSTRUCTORS Querterty GET TWICE THE STATIONS Now official organ Radio International Guild, keeps posted L ee latest radio, short-wave, television. Send 0c for 4 issues. sne year's Tune Scientificall | membership in the — lapel pin, etc. > & Nore: Being prompt qualifies you for the extra | $100.00 as outlined in thiq t RADIO DESIGN, 103-3, Broadway, Brooklyn, New York City Information on any book free. Write Popular Mechanics Press, Chicago, III. VICAM STANDARD MOVIE CAMERA DEX san 25¢ Complete howr-by-hour program of all chain features Make your own action RADEX PRESS, 1365 CLEVELAND, ome movies of events, trips, $ 50 7 prof ateme etc. Takes F.0.8. a asa oN om mmm feet of standard Phila. film. Equipped with F.5 universal lens. Loads in daylight. Films developed free. Film can be projected from any stand- ard projector. All-Metal Camera $18.50. An ideal gift for Christmas for any member of the family. Order today C.O.D. or send 10c in stamps for illustrated booklet. Gane, a neon VICAM PHOTO CO. 1222Bcimont Ave. W. Stokes Kirk Dept. ?.M.12, 1627N. 10th St.,Philadetphie,Pa.

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164 POPULAR MECHANICS ADVERTISING SECTION

WET CELLARS MADE DRY from the Inside! MP musty cellars are unsanitary, a dan- r to health and a poor place to store valuable material. Where water or moisture seep in through cracks or porous _ in the floor or walls, you can make and keep your cellar dry and sweet—a fit place to work, free from oder, mold and rust — by filling the cracks and coat- ing the moist surface with Smooth-On No. 7. This is the one practical waterproofing that you can apply yourself, easily, from the inside, to wet or dry surface and with every as- surance of thorough water- tightness, even in the wet- wrrigg — ag ooaree FREE BOOK Excellent also for patch- ing concrete floors, waterproofing garage, stable and washroom floors, brick walls, cisterns, se tic tanks, water troughs, fountains, fish ponds, swimming pools, manure pits, etc. ———————_, About 25 pounds of ae =A, Smooth-On No. 7 are re- quired for each 100 square feet of surface covered, and no experience is necessary. Com- plete instructions on the package.

Sold in 5-pound cans and 25 and 100-pound kegs.

SMOOTH-ON MFG. CO., Dept. 37, 574 Communipaw Ave., Jersey City, N. J. Please send the free Smooth-On Repair Book. COREE RRR EERE EEE EEE EEE HEHEHE HEE HEHE HEHEHE EEE Return this coupon for FREE copy of Booklet 12-29

The FARRAND RAPID RULE The rule good craftsmen are proud to use and to show. Six or eight foot rules coil easily in small container no larger than a watch. Are both rigid and flexible, Write for six inch sample and descriptive folder.

HIRAM A. FARRAND, Inc., Berlin, N. H. RRR Sa

Welding Cutting Write for catalog—also our payment plan. SUPERIOR OXY-ACETYLENE MACH. CO., P. 0. Box 285, Hamilton, Obie Every (0000-27 toYou/ Coo-Coo Auto Horn (patented) sells itself at $5.00 —Costs $2.25. Agents making high as $25 an hour. No house-to-house—stand around garages, service stations—coo-coo and clean up! Installed by any- one in 3 minutes. Cleverly sings “‘coo-coo.” A jolly greeter. Send $2.25 for sample or write for further information. PACIFIC COAST PRODUCTS CO. 1233 Taft Buildin HOLLYWOOD, CALIF.

The man who studies gets ahead. Popular Me chanics Press will advise you what books to read to advance in your trade. 200 East Ontario Street, Chicago, Illinois. Attractive New Binders For Popular Mechanics Magazine Your choice of colors; blue, green, brown, red or black in these beautiful and durable art binders. Ideal for the home or for libraries, schools, reading rooms, etc. pos’ id. Your name in gold on front cover for 25 cents Address POPULAR MECHANICS COMPANY 200 E. Ontario Street, CHICAGO, ILL-

nei fF

saraesm<o35 iP |

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POPULAR MECHANICS ADVERTISING SECTION 165 z PROFIT WHILE YOU PLAY! BECOME A M.C.H.C.OWNER-DEALER! BUY FOR % ii 1930 *cRs" LATEST WORLD-FAMOUS ALL-ELECTRIC Roosevelt Model 94 A De Luxe console cabinet of genuine matched walnut with burl overlay and OUR SPECIAL XMAS OFFER carved pilasters True screen rr ~F. mas orders pesstves immediately, we will in- en epuives c= seven latest, eS ee eee Sas amplification, shield- t uoted— Model 20 at $69.50 Pine T ed reception; bal- 84 at $79.50. Write at once and receive s anced an eek amazing extra value absolutely Look ia the big city stores and the high class magazines! Teetifier; ’ al electri¢: You will see these famous £creen Grid sets and these Utah Dynamic cabinets featured at high prices, under famous manu- Speaker. mes. Through our organization, you can put this same radio perfection into your owa home at One-third the prices you see adios sets and cabinets are big surplus stocks of leading manufacturers’ latest approved models. We bought them at — enable us to give them to you at less than Roosevelt Chassis prices. They are decidedly not \ecands, very Roosevelt isa Leg ingtremons a the big je—the only tote ye ae a ey , with all the Complete with Pa newest improvements, exactly as shown for this Xmas offer. the only Under our liberal plan, merely to own one of these Radios totally enc’ qualifies you to act as an Owner-Desler. You can buy var own set at the Owner- Dealer Enjoy it in your Roosevelt Model 20 A De Luxe modern console of two-tone walnut plywood, with inset of Spanish mar- quetry. improved sereen grid, totally price. Jwn home! Show it to your friends with our sdvertia MERCHANDISE CLEARING HOUSE CORP. Bz ell fer one-half Retail Prices and make Dept. 509, 1737 8. Michigan Ave., Chicago, Lil, Without obligation send me your FREE catalog and - R E S -— for r amaziag offer Offer § Special Owner-Dealer Offer. specifications. ogi ig out, mail now ¥ Owner-Dealer Namé....ccecees Oe eereresececeseseceseresesesees H. p ney RM MERCHANDISE CEEARING ie bs cluding rectifier: all mcecnanets RUG Addrem..seeseeeee atsitieiahehtatensasimahille 3 Speaker Dept. 509, 1737 S. P LAL tA Chicago Cy ccccccccccccccccescoscocerd Btate......++++-. i DON’T INVEST 0 U) 3 Until You IN-| fn VSP MONEY 0 Up VESTIGATE the = and stamps 2 UB ‘MULTICRAFT WwANTED 0 U Th i - fl : ie P9st® YOURSELF! It pays! I paid J. D. tendy tor use. A postal will Weiee fall partisnlase Send er cent. Mr: Manning, New Yorls, $2800 for sos me Tessmer Machine & Tool C 1428-1445 DT, Mi silver dollar. Mrs. G. F. Adams $740 for a few 0.) RivaRD ST.. troit, Michigan old coins. I want all kinds of old coins, medals, bills and stamps. I pay big cash premiums. Seni A Better Looking Nose! your Perse ILL PAY $100 FOR DIME 1894 S. Mint; $50 for 1913 Liberty Head Nickel (not buffalo) and hundreds of other amazi ng prices for coins. Get in touch with me. Sen 4c for Large Illustrated Coin Folder. It may ey or during the day. Money refunded if not mean much profit to you. Write today to satisfied after thirty days’ trial. Write for free . FORT WORTH, TEXAS M. & Ter, Ptoneer Nose Shaping mapine Spectaties ul Rare Coin E sblish in U.S) ps lilly ONDS _— “~| LIF. (Sent Free Examination ) rs Di here 60% of Market Prices? own, 10 large loan firms combined (world’s oldest, lareeet e association of its kind—ratea over $1,000,000.00), loans rable money on diamonds. A few such loans not repaid. Diamonds originally sold by outstanding jewelers. Of r for course we can loan but a fraction of real values. You get the advantage in Unpaid Loans at cash prices Price you can try to match at full 60% more. Every liberal privilege.—Examination free— No obligation to buy. Id Ev: | ey accurately described. Radically low ss Free List of Unpaid Loan Diamond Bargains ress for any duality. aay aoe. Welton qunsuntend amounts you can borrow (like Insurance Policy loan guarantee’ fall ‘detail of free cunmination offers. You don’t A tisk a penny. X century old house (references: Bank of Pgh., Union Trust Co., 8rd Nat’ Bank). Lists limited—Send now. ror.f REE LIST Jos, DeRoy & Sons, Opp. P. 0. 1987 DeRoy Bidg., Pittsburgh, Pa. i, r cewene © Sa) aim) _™ eee

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166 POPULAR MECHANICS ADVERTISING SECTION SORES vO TO ANY OUT OF THE WAY WHEN NOT IN USE Glaring Lights Cant Blind You! Now—end that nervous tension and peril that faces you when glaring headlights flash in your eyes on dark, narrow roads or winding curves. Face-a-Lite is more than a glare shield. Note description above. ‘33 Sak, Incidentally, if you need extra money, here is your chance to clean up. A. H. Wilkinson made 33 in one hour dem- onstrating Face-a-Lites to eager car owners. Lewis Carpen- ter made $51 in seven hours. And Samuel M. Davis teports sales “from noon Tuesday to noon Wednesday” that give him $263.10 profits! Over half a million car owners have paid Face-a-Lite agents wonderful profits. And no wonder! Face-a-Lite is the one glare shield that dims blinding lights without blocking your view. Note the illustration above. Just hand one to any car et him look at glaring lights and he’s sold. Car owners and spare time workers are invited to get the Face-a-Lite liberal introductory offer and easy “extra in- plan as explained in my free book—‘“‘A Sure Way to Safety and Profit.” End that night driving menace— and make extra money doing it. Mail coupon below to W. M. WILLY, Pres. FACE-A-LITE MFG. CO. W-79 Logan Bldg., Mitchell, So. Dakota. w. M. ‘Witty. Pres. te Face-a-Lite Mfg. Co | W-79 Logan Bidg., Mitchell, So. Dakota. Without obligating me, send free book, I “A Sure Way to Safety and Profit.” Also full description of Face-a-Lite and your x liberal introductory offer. 1 } i CGh tlw Ge Qhes CONG stecdnt at ccccketaccsxetecosaees i Ne 4es cnéuy Se berev pcbbs naleeeepcosncnceoeees covets | | City.. Be cccencescanvan FREE CATALOG YAY wew SCREEN GRID sers Wholesale Prices Everything in radio at wholesale pine aee, Screen Grid, A.C. Hum- ess All-Electric Sets—Standard A. C. Sets—battery operated sete— Priced as Low as $45.95 Also an attractive array of beautiful ies, parts, kits. Most oe catalog in radio—196 pases of unusual price values. Write r it today! ALLIED4 RADIO. CORPORATIOW’™W 7iiW. LAKE ST. DEPT.66 CHICAGO RADIO! RADIO!! AGENTS: Make big money selling antiensity ® known radios to consumer. Liber discounts. We finance installment sales. Sold F soe 1,000 franchised retailers for last five years. Live agents wanted for open territories. Write Verein Bex 1142, CHICAGO a CuI-RAD D RADIO AUDIONS. Eight years eclling z $139.50 quality radio equipment—now we've made an all goon set of our own, jas all the latest fea’ ith 245 power tubes, rage “A wi “Trane.” iP Sostker, amp = new ul vox ut console, ete ‘a — wee. Agents * yew. MWeite todn sins popaition te Sat Builders Write for , a ay Catalog mane APP CO., Dept. P.m. 415 S&S. Dearborn St. ” Chicago, in 22 Cal. Blank WINEHOLT MAM. ORDER, Box B-25, Woodbine, Pa. GET INTO THE VENDING MACHINE BUSINESS LARGE PROFITS BEING MADE’ You buy machines and place them in stores paying merchants 25% of receipts. Gum and , Peanuts used allow you from 100% to 200% : profit! Start with small capital during spare “sf toe Wy time. A route of our machines will make ib you financially indenendent! write for catalog and full details Today! ff O.Roseins & COMPANY 28-p DooworTH Sr..BrooKivn, N.Y. &S| METAL TURNING LATHES 435 Keota St., js Ottumwa, ta. Goodwin Mfg. Esc hur

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SE a i i

i “Se all nce. -<ctthel

L_ POPULAR MECHANICS ADVERTISING SECTION

Big Christmas Catalog Ready! 202 Baperaatee PAGES OF THE LATEST ILLUSIONS, TRICKS, NOVELTIES, PUZZLES AND SENSATIONAL ESCAPES. Send only ten

cents (United States sta or coin) for this fully describing over six hundred eighty articles. = Write it or make a note of it include with your order of any of the tricks described below. Fire-Eater OAKS’ MASTER pa OF TRICKS 4 pron ® aoe by M and entertainment for breat every day in the am woes

New Bills To Conform With Small Size berg y 4 With these bills it is easy for a person of limited

tr fe a d : 8 will” think they heard a steam engine or someth: You can blame the whole “OAKS? CARD MIRACLES - Complete box of our most Popular card tricks. Easily a aut Caras, Bisaiaehtng ards, minishin Card Trick and Wond . erful Ace Tries, If arehaced grbarately wo cost $1. Special complete, only 50c. Serpent's Eggs

When lit with a match each egg hatches itself into a snake several feet long. curling and twist in li

scilia able to make it le down: G disappears, and is of hat, Si.00 for vanishes; jat and Dice Trick. andl culeusatie yet no one has touched

apparatus t com- ice or experience, anyone can give a complete entertainment por ras cass ps noe tat = bA-$ cks so ple a ae seuss us tbe completa eka This book tells of [sect secure | Magic Ball and Vase Trick. the sciences of is inside, Magic, Witch- hes io et and pon replacing the tides. lid has disap- craft, Alchemy, puree. Se Dise emer Si Necromancy, consists of changing iow Ki to four Aces, and then to blank cards; Magnetic W: Mesmerism, etc. sages cles tries Nitken Bustioe fiom the haath fick of 15 ies It tells how to of colored sibben comes out of the mouth; Disappes H hief. make persons Kerehief held in the Enchan: tle. No one but your-

me | Pri bere, the performes, makes his escape. on nded. SIBERIAN RT CHAIN &trong chain is thoroughly ex- amine atter —_ performer's are chained together and locked with a padlock. Sores the very yes of the specta- the stage and is highly recom- Very easy to perform. ice 75 cents.

posse disa MAGIC CARD BOX med the card h: The

See With this instrument to pe eye you can what is go behind your back. aw times things when no one thinks you are look- ing. Just like havin eyes at the back o your h Price 25¢ post

su st ten ARETTES, BUT Exploding Cigarettes ST LIKE OPP imARy ciG- SUCH REAL ARTLERS! The box contains genuine cigarettes of excellent quality. They appear so real, but when each cigarette is about one-third smoked, the — tsa pos surprise as it goes off with N areat mirth provoker " yet A fy i ae Price 25¢ box.

Mystery With this contriy- | to ance esapparentiy to chang iat ease ie flute. No fingering. paper inte’ a bill of any denomination, Can be lormed ‘i

Magic Nose Flute A unique and novel musical instrument played with nose and mouth combined. Just a little knack re- uired to enable you roduce sweet music that resembles Effect is charming when played as an ac- to piano

THE JUMPING PEG A very effective pocket trick which will puzzle them all. The performer intro- m peg hen i upper hole, both sides of the pad- dle being shown, Law 4 the peg ote enters on each side. Upon the performer sim

then to the lower one and bac! are continually shown. Price 1 his hand, the peg mysteriously = — L upper h ale to th to the middle hole. while both sides of the paddle Sua.

WANDERING DICE THROUGH HAT sents after = | company -y 2? aced cen ot : borrowed hat which the con- jurer holds y therim. An examined cover is now put over the dice, and upon command, through the hat and falls upon the floor. This is

MULTIPLYING BILLIARD BALLS

y producing a solid bil- lard ba bail ee yy simply moving h thru the air, qnuses o_o nls bas ball of the same it. veryone matching ses “<aty yo OG Make t like manner. Box of 12 loc i companiment or easy to do, and so clever thet no one ean | a fo m vanish Rena Tate | sete ave | er game pf | eater ceo ic oe | pa na ate ee

BIG FREE OFFER

Our large die box trick is sent to you when you have orders amounting to only $25 within one year. You have twelve full months from the date we re- ceive your first order to make your purchases totaling $25. We are the largest dealers in tricks of all kinds in the world. Order from this adver-

OAKS MAGICAL CO. tisement or send for our big catalog immediately. Above are only a few of more than six hundred a nd eighty new tricks, puzzles, illusion and novelties. Deal with us and get satisfaction. Dept. 802 OSHKOSH, WISC.

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168 POPULAR MECHANICS ADVERTISING SECTION Four-In-One QUAD UTILITY SAWS saps §6=« $695 Here’s a utility saw with a thousand time and labor saving uses. Four different saws in one—adapted to any cutting problem in the shop, on the road, or in the home. Works easily in holes or corners; cuts in tight places without laborious filing or chiseling. With QUAD you can make a true flush cut; cuts broken nipples or bushings inside pipes; finest “*key-hole” saw you ever used. Illustratiogs w two of the four set- tensi con- trolled by the fingers. Just write a postal or sign and — Sy ee arrives it d jus postage. Use QUAD for With : fied, return it QUAD your Four-In- k. This of- One Utility fer limited Saw goes 5 Tung- sten Steel Saw _ mieten. Fcceamntpoed ROGERS PRO $ PRODUCTS CO., INC. 190 Pacihe A , NJ. —write Man B. Write 1 for Special Blue Print Offer AMERICAN C CHIME CLOCK COMPANY 1670-P Ruffner St. Philadelphia, Pa. 25 POWER $1 GERMAN POCKET MICROSCOPE A marvelous German 5 dig Ay microscope, size of pencil, enlarges diameter 25 ti area 625 times. Fine lenses five: extra large field and § peat light. Only 4% inches by inch; weighs but one Used in schools an colleges throughout the a eine for biology, geology. botany, nature guay. examining stam ps, finger prints, insects, cloth — s and thousands of other things. a handy lowntats wn prepaid. Money back guarantee. Discount for 6 or more. BINOCULARS Q7%i20.Se 9% All Makes $1-$110 E hing in binoculars, field gle , telescopes and optical instruments. The and largest assortment in America. Ca‘ gives all information bow to choose the best for your individual needs at the LOWEST PRICE. Try America’s Leading Binocular House First DuMaurier Co., Dept. 2012, Elmira, N. Y. THIS DEMONSTRATION GETS ORDERS! The flashi: movement of Dazzler and Rainbow Glow Electric Signs—the brilliant illumination of Diamond Neon Signs—the gorgeous colors, the exact materials and construc- tion—all are embodied in the special demonstrator signs that our suc esmen are using with amazing results. MEN WANTED in exclusive territory to demon- strate this line of electric signs. Sold at low prices and on easy terms to stores, cafes, Theatres, etc. BIG MONEY! ones earned $517 in 3 weeks. pnearen made $177 in 4 days. Fauley earned $257 in you how to demonstrate and | i: da: Same is yours. % ys. me copgenty yous. eR Big commissions Send today - Pre yy 4 illus- F R E E B oO Oo K trated book Dazzler, Rainbow ~— and Diamond Neon Electric ~ onl full details of mey making proposition. Write Me | CHICAGO sig le Charlotte, N. C. fe See our Big Catalog on Steam and Gasoline Engines, Battery Motors, Dyna-Motors, Drill Presses, Gears, Books, Blue Prints, Pulleys, Hangers, Bench Saws, Display Tables, Model Makers’ Supplies and Materials. Sent Postpaid for 20c to Canada 25c refunded first order HOWARD ENGINE & ure. co. 2417 WN. Ashiand Ave. , 1h. C-A Sanding, Grinding ARBOR, SAND DRUM and THREE 6 in. WHEELS It is on big outfit for real jobs! SANDING DRU in. by 2 in., wonderful for model making floor sanding, refinishing furniture, smoothi ree 6 in. interchange- able wheels of CLOTH, WIRE BRISTLES and EMERY. The ARBOR is simply con- structed, party A as finest materials and de- sign can make it and is easily converted for use on either electric hand drill or motor. me wi An eMolens fime and labor saving = a MONEY BACH IF ‘NOr's SATISFIED! = 3 Wheels and Write for Folder — Dept. B Polishing Comp. ADJUSTABLE BEARING CO., Inc. Indianapolis, Ind. U.S.A.

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of Ww nt on he C= ire

POPULAR MECHANICS ADVERTISING SECTION

169

~ SANTA MARIA 25” High; 11” Wide; 27” Long Write for our ry poo > Nga booklet containing photos and

+ information on all of our models. Miniature Ship M Dept. RT, 3216 NG STREET, PHILADELPHIA, PA.

A $100 SHIP MODEL FOR *422 jg tap the parts in place. » you to go wrong. These models when completed are exact in odels, Inc., You can put a beautiful Ship Model together in a few hours of pleasant pastime Let the World’s Largest Builders of Ship Models supply you with all the er! parts cut to fit and ready to put together for the models, Santa Maria, Mayflower, or La Pinta. You need not know anything about ship building to assemble one of these models. If you have never seen a ship model you can put one of these models together in a few hours by following our diagram and instruction sheets which explain and show you exactly what to do with each part. All you need is a small tack hammer to he diagram making it impossible for every detail of the famous old ships they represent, and when completed will add a distinctive touch to your home. We also have parts for the model fer the Constitution and Flying Cloud at $6.98; all other models listed at $4.98 each. La Pinta—Size—26 in. high, 11 in. wide, 27 in. long. . . .$4.98 Mayflower—Size—26 in. h, 10 in. wide, 30 in. long... e 4 Constitution—Size—25 in. nigh. 8 in. wide, 29 im. lon Flying Cloud—Size—33 in. long, 7 in. wide, 24 in. hig

MINIATURE SHIP MODELS, INC., Dept. RT 3216 Baring Street, Philadelphia, Pa. ‘Please send me the complete parts cut to fit and ready + Lay = gp bd for the Mosel poowe Prt eee eee, w y - pilus Picnse prthe aamne and address piainty s to Saveed dake

ORREC! 7 Your NOSEs NOSE ADJU

‘ou sleep. Results are lasting. Doctors it. 68,000 users. Write for 30-Day OFFER and F BOOKLE Improve your appearance with the ANITA StE ER. Shapes flesh and car- tilage — quickly, safely and painlessly, while raise IAL ANITA INSTITUTE, N-12,Anita Bidg., Newark, N. J.

. Chas: Short Wave Se eiee, os ugsivae< os 0thiok pn odhs SOGee OS Se EOD 0 DOW OD. op os oo thocccnvnscantecm 9.90 Power Transformers and Condenser Blocks at extremely low prices. Send for bargain list of sets, wp and parts. CHAS. HOODWIN CO., Dept. 4240 Lincoin Ave. Chicago

Dealers in Bankrupt Stocks

Is ‘Your Car...... A Gas Fater New Invention Increases Mileage on iia. Auto Gas Eaters An astonishing new device has been perfected that is amazing car owners

everywhere. Thousands have been installed users report greatly ~ creased i} n additi ed is increased, instant starting aod flashy pick-up is Seanad and carbon formation disappears. eva anne owner country needs th ew invention. Its cost is so trivial tT paya ya tor itself in a few days time, Ba it will save - of dollars for its owners in gaso $100 a Week Territory Ope -

$5.00 an hour for spare i Men are needed in — ery locality to Signals Auto Driver When Tire Needs Air

SALESMEN and DISTRIBUTORS can make $350 to $1000 per month. Write for Big Money Making FREE SAMPLE Offer.

uae care of the tr eadous loc , 1. Sales ability fe not re- | Name........-...-.cecececccccecccccsccecsecsccceseces uired. ow! uy on workers. “ee ee er a = lo cc anndesrecvcvecithetiliewustes FREE To help our workers we furnish them with this —_ Quick acti a, Whirtwind eae saver free for their own cara. | "CTT tte ee teem ewes wee eaeeeeeee pbecessary. @ one in your locality to ‘cms ae Govico whieh every auto on owner will buy. Send today OES. cckadiads oceesvnidenshs ceupedconsded¥bevs particu and free sample off Whirlwind Mfg. Co. 999 S7-A Third Street, Simpson Manufacturing Co. *) MILWAUKEE, wisc. Dept. G. 307 West Douglas, Wichita, Kan.

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170 POPULAR MECHANICS ADVERTISING SECTION L eWovld's Premier, -Filter Tunin parses of id“Amplifier Six Tuned Circuits World-Wide Range REGARDLESS of cost, no radio produced in mass can even approximate the skilled perfection of the new Custom-Built “HiQ-30.” Here is the newest, most efficient model ever presented by Hammarlund — the climax of five years of unequalled custom de- signing and famed throughout the world for power, selectivity and tone. Assemble it your- self in two hours or we’ll recommend a local custom-builder to do it for you. Choice of rca speakers. $139.50 to $1,175 H 4: complete, less tubes. Fo é ' oe” y Mail Pol coupon for oie 48-page re ea, “HiQ-30” > Po - ee Manual , 4 ras «A “0° Apply pat: int, lacquer, varnish or enamel the DOMESTIC AUTO SPRAY and get results you believed only skilled painters could accomplish. No experi- ence and p —y gt no effort required. Idling ae. auto, truck or tractor, h valve « of the DOMESTIC in spark plug opening, furnishes pot power to operate this highly developed ar brush. Just the outfit for homeowners, farmers, etc. Furnis ed complete, ready for instant use W. R. BROWN Co. 5837 W. Ohio St., CHICAGO AGENTS Her2’s a BIG opportunity to make BIG money. Write today! XMAS $S$ FROM of useful, SPARE TIME WOOD-WORKING., attract! drill groove At Lowest Cost included motor, $32.50. INCREASE YOUR POULTRY PROFITS! By per Breeding, Housing, Culling and Marketing A AMERICAN N POULTRY JOURNAL tells’ how to do it, and in addition a series COLORED PicTURES 7. oy text tell and show man — you should know. They are not j Pictures of bi ut Giese of an educa- tional nature, fomntdon never before shown & poultry per. 12 nae of ot American Poultry Journal contain about Pages Price 25¢ a AMERICAN P POULTRY JOURNAL, 14-536 S. Clark St., CHICAGO RAISE CHINCHILLA FUR RABBITS & We et ices for fa — ess Fr peasiilisstrated book catalog spel tec ble pe pokes i ite Yor fons shores BOTs Now FREE = Nation’ 3 Great Poultry Manual; tells about mam- j 52 BREEDS pure tested poultry, Feeding, Housing, Beer PRICES, best t Fowls, Eggs, Chicks, Brooder Houses and Btoves. BERRY'S POULERY Y FARM Box 29 Clarinda, lows HUNDRED HUNTING HOUNDS Cheap. Fur Finders. Money Makers. Dog Feed. Remedies, Collars, Hunting, og Camping Equipment. Agents Wanted. Catal KASKASKIA, M-144, Herrick; Th SQUAB BOOK FREE Breed PRsquabs for rich trade. Sold hy millions for more than.chickens. Write for free 48-page book telling how to do it and how to profit by new sales method. eb ee oures Roce Savas co. Highlands, Mass. WHY Banao? Scalp aeone’, dn 0 stops pose hair, like ; Whyte-Fox No. 2 knocks head colds, skin and rectal irritations. Used by millions. Money- Guarantee. A toilet necessity. A valuable booklet free on request. At Barbers, Druggists, Beauty Parlors Sey-we. "x LUCKY TIGER REM. CO. Your eo SS When all else fails end ee suffer. ive Finest Performance Every _ piece of 8S. & B. equipment gives dependable, economical service. The ‘‘Wonder” Scroll Saw is ideal for fine craftsmanship and costs only $15.00. The motor-driven Lathe is the biggest value you can find at $35.00, without extra tools. The 3-speed Lathe, without extras or ll your handiwork ata hesdinoays a oe wey for Scroll Saw \e . too in a few ~~ aaah, Write today for catalog! $45°° Ginter | §, & B. MFG. CO. Nev

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103 \F POPULAR MECHANICS ADVERTISING SECTION 171 SELLS LIKE WILD FIRE New impreved wind>w washer eliminates all muss and fuss wherever there is glass to be cleaned. Re- stricted territory to Producers. Write today. CARTER PRODUCTS CORP. 951 Front Street Cleveland, zanna SAH QUIT. :%2 An Ideal Xmas Gift for your order, particu Sock on these 8) 15” high Our. outat includes rd Double attachments to Rip, Crosseut, Bevel, Grind, Mitre, Groove, Sand, Mortise, Tenon and Polish. Everything is complete, ready : in any light socket. Same spomincsiens, but with Tpall and 12° by 18° table to Pe: Saw Table only with Combination Blade and 4 P Motor $30. 00. Catalog Freein which thisSaw Outfit is more clearly pictured. It also contains Bench Lathes, 12” Band Saw, Complete Work Shop and Hardware Specialties WILBAR ‘co. ONC., 2020 E. Arizona St., PHILA., PA. BOW LEGS? THIS GARTER (Pat’d) Makes Trousers Hang Straight If Legs Bend In or Out Free Booklet—Plain Sealed Envelope THE T. GARTER =O. Dept. E th Bend, Ind. 12 IN ONE TOOL! A Whole Tool Kit in One Salesmen Making Over $100 A Week A patented invention never before presented to the trades. Used by carpenters, cabinet makers, machin- ists, millwrights and workmen in any craft. Also a handy tool in the home. Instantly adjustable—True—Precise. Use it as a Tri-Square, T-Square, Mitre Gauge, Bevel Square, Inside-Rule, Extension Rule, 30°, 45°, 60° angles, Marking Gauge, Compass and 1 Two Foot Rule. Has many uses. Price Send Money Order or will be sent C.O.D. in U.S.A e pay postage. This tool was featured editorially on Page 191, August, 1929, Popular Mechanics. Twelve in One Tool Co., Not inc. 2? 24:45 %ne Stree You Can EARN $150 to $300 MONTHLY Charging Batteries in 8 Hours £ tart Filling Stations Making Re! of your Fy 1 Doshenten, 0 p BIG MONE ops, Gi tery ons if making # I yo =e HBS 8 Hour Battery Service. mendea by t ry makers. Con- ao "Potential Ay Pen one a yy fH io pe than the other yp Ae in one-t e time, and at a caving of 30% to 30% on nt. Angeap ‘can operate. oy coupon below for 4 ‘information on how to get started in this money making wo Shouldn't Cost You a Cent Pays for Itself—Brings a Big Profit Besides Only $16 Monthly 30 DAYS’ TRIAL AT OUR RISK Largest Profits The best paying work in automotive field today is 20 minute car washing. Puts you above competition—eliminates all drudg- 7 Users report $100 weekly profits. Liberal trial, easy terms. Savi in labor and material over other meth: will easily pay for it. Earn 5 Men’s Wages Portable Paint Spray does the work of five four men's w: as fit. Paints Cars, uses, Garages, Barns, Furniture. No experlonee ane necessary to operate. Check coupon for trial offer terms. CAR WASHER Paint Spray Only $12 Monthly Free Air Service costs you only $12 monthly for a we months. Fully Auto- matic day and it service will draw = to Your s Op as well as operate air tools. kK coupon for full details without a Air Service Box M129 - TROY, Bro ther e, OHIO Tear off and Mail Teday __ Hobart ym Box M129, Troy, Ohio. Send me complete infermation on the items I’ve checked— your thirty y-day trial offer—easy paymert terms—information on how H. cauipenaint will increase my earnings. O HB 8 HOUR PAtTERyY CHARGER O HB TEST BENCH O HB PAINT SPRAY OB AIR SERVICE O HB CAR WASHER

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172 POPULAR MECHANICS ADVERTISING SECTION 210 Power Amplifier and “ ‘05 Unit without tubes This famous genuine Kolster K-5, AC Dynamic Reprodueer is complete with a 210 Power Amplifier and “B” Supply Unit all celf-contained on a — real fine matched ru Unit weighs 45 lbs. without the Cabin The oes itself is Pencil-Stri Walt erie beautifully designed with Cathedral ecired, the Power Aner Mean ES will also supply 22-67 and’S0 volte “B" parent. sufficient x: any set ae up to 8 tubes. tie voltage r tube, UX-874, main- tains the tp volume —— Yand steady. ona, ewes ers ic Reproducer can men Be used with x, bettery acing the last audio stage, or be used with all tubes of ae a "Wherews r used it will bri ody - ery alien ond range of tone; every note is reproduced with utmost faithfulness, pure and undistorted. It will modernise & any radio receiver. Uses 1—UX-210, 2—UX-281 and 1—UX-874 tubes. A 20-ft. cable is included with each instrument. Operates direct from 50-60 cycle, 110-120 volt AC current. Brand new in original factory cases and guaranteed. Every —- is serial-numbered ad has factory guarantee tag AMERICAN SALES COMPANY 19-21 Warren Street, Dept. M, New YorkCity AFightAgainstRupture ATTENTION NEGLECT Buoyant should realize the seriouse ness of Raptute, even where the protrusion is small. The Brooks Ap- Deulance is the finest kind of mechan- ical at eis p for reducible rupture that it is — to build. Hard . tif? springs are entirel Piiminated. Our Supeaite A ushion, light, cool and abso- lutely sanitary, is protected by patents in the United States and all important foreign countries. Your name and address pinned to this advertisement will bring com plete repy BE of our free trial plan in plain sealed envelope. No to write a letter. BROOKS APPLIANCE CO., 107C State St., Marshall, Mich, QUIT TOBACCO No man or woman can escape t! the harm- ful effects of tobacco. Don't try sot a ish ided the hold tob has yon. St Join the thousands of inveterate users that have found it peasy to quit wi with the aid of the Keeley " Treatment For K FE 7 aa men Habit Over 50 tte Quickly banishes all craving for tobacco. Write today for Free Book telling how to [ny A Free 3 nea from the tobacco habit and our Money B THE KEELEY INSTITUTE, ory A-s28, Dwight, IMinois EADY OR AL EST Big Cash prizes are won yearly by contestants. Send 10c today for 48 page illustrated catalog and contest pestientene. Hurry — no time to cman — AIRPLANE SUPPLY CO. Grand River A Detroit, Mich. rT aperting and tan- gling of telephone and electric iron cords. House- wives and business men buy 1 to 50. NEW KIND OF CORD SET FREE Every Neverknot Salesman is given FREE the complete Neverknot Switch Plug Cord Set pictured. This new kind of ironing cord automatically coils itself out of the vey and a new kind of switch ue prevents scorching and avs & a ry, vA) you '90.A W fr AGEW>S . E is different and it’s yours free if youwork for us. Don’t delay! Send now for free offer. NEVERKNOT CO. Dept. 12-V, 4503 Ravenswood, Chicago RANGE INVENTION! BUCHSTEIN’S FIBRE LIMB —_ ~ ‘ 4 is cogtaes to oat Stop Using a Truss neat, light. aw for ail Setormitien STUART’S ADHESIF PLAPAO-PADS are entirely different—being yo appli- cators—made self-adhesive purposel y oa the muscle-tonic called “Plapao” MB. applied to the affected parts, and to minimize danger of slipping and painful friction. The fabric is soft as velvet, and being adhesive—clings closely to the without . Straps,buckles or springs. Easy to apply, inexpensive. For almost a quarter cen- tury stacks of sworn testi- monials from many differ- ent countries report success —without delay from work. The epidermatic absorption Awarded of Plapao utilizing “me- Grand Prix chanico-chemico”. therapy tends toward a natural process of recovery, after which no further use for a MAIL COUPON BELOW TODAY FREE TEST COUPON PLAPAO CO., 193 Stuart Bidg., St. Louis, Mo. Send me a FREE 10 day test supply of the remedial factor Plapao and 48-page illustrated book on Rupture; no charge for this now or later. o “Awarded Gold Medal ai» fir Cle yee int

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Sooswi’ POPULAR MECHANICS ADVERTISING SECTION An ad " like this ~ Started Him Making 700 a Month How’d YOU like a Job like his? Why plug along on $40 or $50 a week when over 1800 Popular Mechanics readers, like you, now make $500 to $1000 a inonth as Clarke FlorKraftsmen? Stop doing drudgery. Quit wasting the years in which you should be laying up money for the future. Get into Clarke FlorKraftsmanship now and earn big pay. Be a Clarke FlorKraftsman Earn $25 to $75 a Day This ad tells you the low-down about Clarke FlorKraftsmanship. There is no applesauce about Clarke’s statements of what you can make. $25 to $75 a day is the pay men get for turning old floors into new ones and for sanding floors in new houses with the Clarke Vacuum Portable Sander. A. E. Sweeney, Alturas, Calif., writes: “‘I made $76 the first week.” Fred S. Gail, Cody, Wyo., says: “The little Devil, as it is called around here, paid for itself on the first job.” Millard W. Dalby, San Marcos, Calif., writes: “In one hour I had my 200 sq. ft. of that floor as clean and new as any new lumber would have been. My price for that work is 10c a foot.”” W.G. Roe, Clarke FlorKraftsman, Richmond Hill, L. I., N. Y., “I have made from $40.00 to $45.00 per eight hours with my Clarke.” You Don’t Have To Learn a Trade Go To School or Pay Tuition This is not a school course or training system. You pay no tuition—buy no books. We teach you to run the Clarke Vacuum Portable Sander in a half hour or less. You get paid for the first day’s work you do with it. You don’t need to be a carpenter or a painter to get into FlorKraftsmanship. Clerks who never made over $30.00 a week, mechanics who couldn’t earn enough at their old jobs, young fellows just out of school, are highly paid FlorKraftsmen today. The same opportunity is open to you. You need only about $100 to start. No office or shop required. The Clarke and some sandpaper puts you in FlorKraftsmanship. The Clarke sands 900 to 2200 square feet of new floors a day—and you get Paid 2c to Sc a foot. On old floors the Clarke does 300 to 1000 square feet every eight hours. Here you get 7c to 15c a square foot. Many operators do far more footage than this. No wonder FlorKraftsmen own cars and homes and still save for a rainy day. Stop Wishing and Start Earning == DARK Esters ~— —— to your Eas STE. no-future job. Get the i —_ acts that have put so many on the road to independence. Learn the real truth about Clarke FlorKraftsmanship. Use this coupon. 1 Se A . ie 63. a Send it today. Don’t wait till you see 3 or 4 more Clarke ads and i Chica 0, Ilinoi 2 ’ learn that 3000 instead of 1800 readers of Popular Mechanics have — Sa seized this chance. Let one of these new FlorKraftsmen be YOUR- | Tell me, without obligation, how I can make 7 SELF. Stop wishing and start earning. 1 $25 to $75 a day as a FlorKraftsman. i CLARKE SANDING MACHINE co. 1 TRB. ckccociatcccccsacsvivetecespotasees - 4 DEPT. T-212 DB BbOtieti. 0.22. ee ccc ccessapsnnscsonswuaves ¥ 3831 Cortland Street CHICAGO, ILLINOIS i GP iiwccesietvecvedscovestst Beats. 656 so i ee es

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174 POPULAR MECHANICS ADVERTISING SECTION FLY A GLIDER! Gliding, the New Sport of the Sky NeGiag Gung eaing the past vgemtn- Ove years has taken the world by is eae Spend Sow pars at is as safe as sit ry exciting. Gliders are airplanes without engines, and can be flown by anyone with a Suttle skill. Nothing in the entire world of sport can compare with glider flying. It is Now Possible for Anyone Who Can Handle Tools to Build LS J secctent Glider Costing from $50.00 Upwards. “GLID is the first complete book in a new aerial- -_ a field. It is the only authoritative American book sul It Contains All of tee Latest Glider Advances in Ger- many Where This Sport Has Become a National In- stitution During the Past Two Years. ie a German stayed up in the air for 14 hours in a You can do the same or better the record. peer book enables you to build and fly poe own glider with little work and small expense. The entire book is written by expert gliders, both German and American. Some of the main chapters are: “The Glider’’—How to Build and Fly It, by John Pierce. “Practical Gliding,”’ by S. Staner and A. , “ESiiker: by Wallvce Bam pew 10 Buide am by Wallace B “Glider Construction and Design,” by Alfried “The 8 Rhon Soaring-Flight Contest,” by “The Laws of anon,” by W. Gvepferich. This is a large book, co 100 pages, with beauti- ful cover, in four Colors. Size 9 x 12 inches. With over 200 illustrations. You Can NOW Buy this TWO DOLLAR BOOK for at most of the larger newsstands. If 50 newsdealer cannot supply it, send check, money order, cash, or stamps, to POPULAR BOOK CORP. 94 Park Place, New York, N. Y For the Home,Workshop, or Manual Training ITH this 500 Ib. sighten Simplex Ws ten window or Planing or re- cing locks —level 1 caleitene. plumb- = drain pipes, ice box—straighten os came et giaee wee, radio cabinets, teSaate | ia tt the Bex’’ is for the man who uses tools, or boys interested manual gor a a egy toys. It hundreds o f uses. Sturdily built, beautifully finished, and unconditionally guar- Ite pur is to d urpose jemon- strate and advertise the exclusive safety feature of the visible screw and power of the larger Sim- and sent Gentlemen Please send me postpaid 1 Simplex Miniature Jack at 35 cents and aneactee cents each =e my friends. A Say of! ry ce seedianed is enclo Merk color desired: Red, Sioce ‘Green. 0 JOKE TO BE DEAF w I make you hear. A Medicated Ear Drum oe,e Pp. Ne RSs Artificial Ear Drum Co. (inc.) Bidg.; Detroit. Mich. —EVERY DEAF PERSON KNOWS THAT I make myself hear. after being de deaf for 25 years, with these Artificial Ear Drums. I w: them day and night. They oon head noises and eteaing care. They are persooty comfortable. No one sees them. Write me and I will tell ou a true etory.how Igotdeafand STOPS A ACHES—SUPPORTS BACK THE NATURAL BODY BRACE Takes strain off the back, the abdomen; relieves nerv- tS Stdel ine "Forienan'Women cosTs N G TO TRY IT Write for our 30 days free trial offer, free il) book, measurement blank, ete. NATURAL BODY BRACE CO. Howard C. Rash, Pt.,77 Rash Bidg., Salina, Kansas Palmolive Shaving Cream “5 New Delights for Men” ART GLASS LANTERNS made at home, Interesting and profitable work easily learned - our simple La mag — us make it for you. Inquire you want anything i in G The Glass Company, Lh a aa The man who — ts ahead. Popular Mechanics Press wil! advise ft ws books to read to advance in your trade. 200 nat Ontario Street, Chicago, Illinois. LATHES ; $ Ag wines fe bet. § NG bed, otor driven asehen, =. 50. Twos motor driven 4 with circular saw table, $38. Practical ma- chines for your shop. CO., Parkers Prairie, Mins. Ti inve shor tha gua

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with POPULAR MECHANICS ADVERTISING SECTION Astonishing Invention Protects Your Car From Thieves This unquestionably is the queerest, most incredible invention since the first discoveries of radio! A magical, shouting, automatic watchman that actually is far more nhuman! Never sleeps, rests or gets tired! Stands guard over your entire car from spare tire to headlights and steering wheel! Endorsed by police! Approved by insurance companies and Motor Associations! Now offered on generous 10-day free test basis! The coupon brings full details. No Wonder This Startling, Uncanny 3-Minute Demonstration Brings Fortunes To Agents " HAT makes it work?” ‘“‘Where on earth did you get it?” “Bet you five dollars he’s got some one hiding in there!” “It simply can’t be true.” A running fire of comment like this breaks out whenever and ing features is the fact that it can be installed by anyone in 3 minutes or less. There is absolutely no cost for operation. It will last as long as the car. Fits any car from Ford to Rolls Royce without adjustment or fussing. For introductory purposes a special 10-day test wherever this new invention is exhibited. And why not? When no one ever heard of such a startling, uncanny device before! In fact few people would even dare to dream there could be such a thing! So this, men, is something really NEW, something to grip the imagination of everyone, something that sells to every autoist on sheer novelty alone. Distributors, “‘star”’ salesmen, every man who wants to double and triple his present income should note carefully the following facts. A Mere Handfull Note the tiny size of this The Secret of a Theft-Proof Car ae offer is now being made. If you are interested in learning about the most astonishing inventionsince the radio first came in, use the coupon at once. If your present income is less than $75 a week, the profit porsibilities as our agent will astonish you. The coupon brings details of all offers. Mail it now. 4 TEMME MFG. CO., Dept. W-10 411-419 No. Trumbull Avenue CHICAGO, ILLINOIS Now in this amazing new way, every car can Tetavator™ Rey sy x Aut 7 c be protected from theft for 24 full hours a day. Ty LO 4 In the garage or parked on the street, if any thief tube! Test it. Mail the fL y so much as pulls at your spare tire or touches coupon today. his foot to your running board—ZOWIE! A riot of noise starts instantly! And your car never shuts up till the thief leaves. And listen to this. Even if the thief is wise to what’s up, you alone place the secret control button anywhere ve want it around the car. The thief can’t possibly find it. If he wastes time looking for it— Bingo! He's caught and on his btn / to jail! This —— invention guards your spare-tire, -lignts and spot-light as well as the car itself. Installed in 3 Minutes—Costs Nothing to Operate The inventor has asked the U. 8. ap to protect his Patent rights in this revolutionary discovery. uncanny powers and to distinguish Bs from everything else on earth this queer discovery is now called “Devil Dog.” Among its amaz- Temme Mfg. Co., Dept. W- | 411-419 No. Trumbull Ave. ~Sinicago, Tit. | Rush details of your big 10-day test offer and big profits | for agents. | NOMC. ......ccccccccccecccccscesesssesesssesssseesesens 1 SRR SE: Res eC aS ee SS | | TOWB. ccccccccedccdcccscoccccevcccses State... ..i.ccscece ] {.] Check here if interested only in one for your own car and not in agents’ money-making offer 1

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POPULAR MECHANICS ADVERTISING SECTION Zi y Here they come! Around a turn and down | p = the home stretch to cross the finish line with a last furious burst of speed! You want things that will “GO”—things you can race with—scooters, ushmobiles, small autos with motorcycle engines, wind wagons, etc.— Whether on spinning wheels or glistening runners—fast ice yachts, skis, toboggans, bobsleds, motor driven sleds snow speedsters. You air-minded boys enjoy gliders and model airplanes. Turn your back yard into a regular amusement park with all these thrillers —ferris wheels, roller coasters, merry-go-round swings, etc. How fascinating to imitate the big engineers and make small water wheels, pile drivers, aerial cableways and other things that ‘‘work.”’ When at camp or on the water you néed plenty of ideas for new ways of having fun. Here are dozens such as water bicycles, push boats, water coasting toboggans, water games, etc. Cn rainy days and other times when working in your home shop you have the hardest time finding interesting things to make. Here are any number such as electric locomotives, motion picture cameras, wood turning lathes, etc But why try to describe this great Boy Mechanic Library Boys, it simply cannot be done. You must actually have these books in your hands and see them before you can begin to realize that the four big volumes contain enough interesting things to last you until you are a grown- up man. THINK OF IT! 4000 Worth While Things to Make and Do Don’t envy the other boys on account of the things they have. Be the boy in your neighborhood to make the others wonder where you get all your ideas—and it doesn’t cost a lot of money, either. These wonderful ks show you how to me Farts from old cast-off things and perhaps get a few cents worth of material froma hardware store—or have a blacksmith or shop man help you bend some iron, and thus make something that works just as well as though you had paid several dollars for it. Best of all—you get the thrill of having ** Made It Yourself.”’ é Everything is —— out and made easy. Don’t try to get along without these books any longer. Save or earn the money to buy them right away. The complete library of 4 volumes, each = book 7aléxi ig inchesand with 400 Pages. E-YICE $7.00 or single volumes at $2 each. Each volume complete in itself. Books are numbered: 1, 2, 3 and 4. State the ones you want when ordering. Sent postpaid when remittance is sent with your order, or will be sent C. O. D. anywhere in the U. S. Pay postman price -plus extra postage for this service. Popular Mechanics Press, 17 Chicago 200 E. Ontario St.

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ive er tc er, ice Kind in Existence DOMESTIC AND IMPORTED NOVELTIES, PUZZLES, TRICKS, GAMES, JEWELRY, HOME APPLIANCES, CAMERAS, SPORTING GOODS, MUSICAL NOVELTIES, CURIOSITIES IN SEEDS, RUBBER STAMPS, UNUSUAL BOOKS, ETC., ETC. SPECIAL De Luxe Edition The 600-page book which we mail entirely free of charge has a lithographed paper cover. But there are many of our friends who want this book ina permanent binding for their library shelves. For them we have prepared the De Luxe Edition of our catalog— & beautiful hard cloth binding—nearly 100 more pages—many pages in Ser —snd the book itself is printed on very high grade paper. This yr De Luxe Edition will be mailed you postpaid for 25 cents. This price is, ee course, but a fraction of the cost of this beautiful book, Check coupon and enclose 25 cents if you want the De Luxe Edition. JOHNSON SMITH ga MITH & CO. . . . Dept. 845 Racine, Wisconsin eae POPULAR MECHANICS ADVERTISING SECTION 177 Nothing else like it. Far more interesting than @ magazine. And it’s FREE! Doesn't cost you acent. Nothing to buy to get it. Nearly 600 pages packed full of pictures and descriptions of odd items from all parts of the world—amusing, entertaining and useful articles you never knew existed—hundreds of items that stores don’t sell—dozens of things you've always ‘ wanted but never ° knew where Pe. tofind. 25c enclosed. sesseersreceescssceseeees Mail Now! JOHNSON SMITH & CO., Dept. 845, RACINE, WIS. 0 Send me FREE Catalog. CF Send me De Luxe Catalog with hard-bound, permanent, cloth cover. They're all in this amazing FREE catalog. All the latest tricks and magician’s equipment, in- cluding trick cards, magic boxes, vanishing de- vices, ete.—many games, joke ks, real and trick fountain pens and pencils—musical instru- ments of all kinds—fireworks—imported novelties —puzzles such as “ Bootl r’s Puzzie,"’ “ Automo- bile Puzzle"’ and a hundred others—water and blank cartridge pistols—enchanted cigar box—exploding jewel case—load cigars and cigarettes—squirt badges—amateur and professional make-up of all kinds, including wigs, funny noses, teeth, ears and whiskers of all types—good luck rings—mystic rings —odd books—sneezing powder—real diamond jewelry—everything you can think of and hundreds of things you never dreamed of. 2000 ITEMS under 25c Over 2000 of the items shown in this fascinating book cost less than 25 cents and every one is good for 25 dollars’ Put Real“Life” Into Your Next Party Go thru your catalog—when it arrives. Pick out a half dozen fun makers and put them to work at your party. “BIN- GO” shooters placed under tele- phone, plates, books, chair legs or in a dozen other places explode violently but harmlessly when ob- ject covering them is moved. Trick cards, some of our imported ““Mag- ic,”’ one of our artificial indoor snow storms, some of our sneezing powder or any one of hundreds of other novel- ties shown in our catalog and cost: from five cents to a q will get al your guests acquainted quickly and will turn your party into a good natured oO MAIL the COUPON A copy of our new 1930 edition of this big 600 page catalog is waiting for YOU—waiting to nish you an endless amount of genuine pleas- ure and fun. Just think of the hours you on pee reading the highly interesting descriptions of the 5000 odd and curious items listed in this amazing book. Don't wait—don't hesitate—the book is absolutely free. Simply fill in your name and ad- dress in the coupon below and mail it to us at once. Mail the coupon now—today. (See our other ads on previous pages.)

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178 POPULAR MECHANICS ADVERTISING SECTION LUMINOUS PAINT Make Your Watches, Clocks, Etc., Visible by Night Tu sore ere aoe unchtains we have © inet, ry bh TY TY s AA — « MAKER Wonderful own and instrument. ° "Better and quicker; eaves more than pall T your favorite .. Neat, useful, bandy yc Made seiely of eae my briilies t, ‘ to nickel plated. Se, 3 tor 65¢ pparkle out of aes Some ~ tha etn bi NOVELTY BADGES | ‘t ccc: of with = song’ BANal BANOf "A erent mi cr wag, mirth Drovoker yet en SURPRISE MATCHES , & Telescope, a C a pocket M be Laryngoscope—for examining eye, ear, nose and throat. wit is worth all the — to locate even one painful cinder in. the for " 44 The pocket. Something Be grest—you 7 Sent by mail. Only 35¢ or ore! wo very novel metal ba deee Sickel -. kne that can wear, giv ou tun | ight one he gets quite a rprise. . : , Inv ig, tate Es al propo a = thelr hang” cot Piles 10e per box,°9 bexes for 25e, 12 ler 75 conte, Combination Sun Watch =e ‘| STAR TOY MAKER! Be and- Compass re Groton, hooey book PERPETUAL WATCH written. Tells how t make a Pinhole Game Never needs winding. ephone, Boomerang, ceatee Instru- t, Box Kite. ren ing Machine, Mier Li Electri Motor, Electric Door Bell, Water Wheel. me matt. r pair of Skis, an Dee SS) —. oe Pn ian Paice seemed Wonderful X-Ray Tube erful little nstrument ucing opt cal illusions both surprising and Semoqnips to teh chain. Loads like a regular pistol. Pull the treger and ii goss off with & loud han ome 3 tarSing. hd it break open type; Spustretion shows position for loading. M you can see what y entirely , hi & arade steel, plated, octagon a alt + Hisar ied — a comme Se & in 19 Saee ua rod PRICE ws ‘ rn 80 niches i 2. simiiar . 3 yOunson ser smite & CO., Dept, 845, RACINE, Wis. been to 3 for 2Se, ARTESIAN DEVIL A Clever Novelty : Just Press Top and the Devil Dives to the bottom—Let Go and It Comes Up Again. Most Interesting and Amusing The Devil in the Tube is a most interesti and amusing novelty. There PD proper time and peeling off a genuine bill or two from the outside of the roll, the effect created ba be found w be all that can be desired. Prices, poston’ 40 Bills toc, 120 for 50c, or $3.50 thousand postpaid. MAGIC NOSE FLUTE \ £¢ _ coed and your friends will a they beard a steam The Masts Hane Flute, or Hu- | engine or something. You can blame the a. is we and | hideous noise to cour having a very bed cold nov coumenh tnetromeent that | and keep up the fun as long as you like ie nena with nose and mouth PRICE 10c, "3 for 25c, or 76c doz, postpaid. com! ; bined. There Serp ent’s Eggs Boz contains 12 eggs. Post Paid hes itself 20c - nee several is @ slace tube poate os int * no fingering epee you have mastered | fest long, whic inches long, a little glass _ 2 gen om Bing all kind of — ane ee oe devil and a rubber cap which fits tightly over the top of the SI to & piano or any other mus ment, (Bethe = manner. glass tube, effectively sealing it. The tube is filled with the effect is as charming as it is surprising je bex, 10c postpaid, 3 for 25¢ aan the glass devil placed inside, and the rubber cap P NEW BOOK ON ROPE SPLICING! mt oy yy BO A eee mer SQ Spiel koe. = R for, Seete tial ave a ian oan. eae To 3 ia shown in the illustration, and the devil immediately sinks + Ai"sbaal "eas dibac Beene vasleteblsesyanctings co Pmice | CONG, Dottom., As soon as you release the pressure tue ts Address orders = all goods on this and ‘ero eo to | water on By PR 4 is yh. FF, eS oe JOHNSON SMITH & CO. aatine “tis.| testers! rer poring, PRICE ONLY 250 Postpaid rn ge Stamps accepted NSON SMITH & CO., DEPT. 845, RACINE,

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POPULAR MECHANICS ADVERTISING SECTION 179 -_ Into a trunk, under the bed, under a table, back of the door, into a desk at school, or anywhere. You get lots of fun fooling the teacher, ‘policemen, peddlers, and surprise and fool all your i friends besides. 2 is a little instrument that fits in the mouth out of sight. ‘ Cannot be detected. It is used in connection with the : above, and with the aid of this wonderful DOUBLE ; THROAT, or VENTRILO, you can imitate many kinds of birds, animals, etc. Remember 2 you get everything for ONLY TEN CENTS—a booklet giving you full instructions how - to become a ventriloquist and throw your voice, the Double Throat, or Ventrilo, and our : big 600 page catalog of novelties, tricks, puzzles masks, books, etc., 1 oO nt ; ALL SENT POSTPAID TO ANY ADDRESS FOR ONLY cents 4 ’ i INVISIBLE INK Rubber Choning Gum MAGICIAN’S BOX OF TRICKS ; confidential ——— eo i. 4 ; tl oO8FlCUURia ee NOX RR Ae "i Bo | Entertainment............. e Sa ANYONE CAN DO Lb ng | u at ab aememmceaiet 7 invaluable for mode, fat, te, 0 seenes costae ihe Spparatun many reasons we TS real, tha it ine The MAGIC BALL AND VASE TRICK Keep your post- pects it is not genuine until they etart upon Te als and other private memo-|to chew it. There's @ world of tun in ie found randums away from prying eyes this rubber chewing gum — 5 sticks to someone pocket); ‘The HIN DOO Great fun for playing practical] package. Price, 10c Pkg.; 3 for TRICK ey ines chang pose jokes. Only 15¢ a Bottle; 3 for40c 25er 12 tor 75¢ postpaid. ¢ times) ; Wis te ebeten into & coin Rubber Dagger. . . . Price 25e|Rubber Matches. Price per Pkg. 10e ters tiie ~tee GLASS GOB, ae U s BA B Y ‘TAN K ry oes with Y See oat found somewhere piven rd the HIBBON F N FACTORY Fa FROM Sa vies Som power | ot ay mew te ingPrEARING HAMDEN Weer be CHANTED TTLE oo one but youreelf is able to make it la: nA Sogn: the GREAT HAT AND DICE TRICK (e large dice is placed on top of a hat, diss no one touc hat), and last. oO} ™ E XG Pe ered eh ee See > Great curiesity. Place RESURRECTION PLANT St, wet... Pisce “4 nena up ond caste to grow in few minutes. Taken . gree out it dries up f pan doacne of the most ty ne igoeer thas ante: 336 ie ices at and goes tosleep of until put in “9 water again. i J aSe 7se + £ow “4 pestee De This is surely the most ingenious of a oad s. . ot Vs istols. For ammunition ALL ¢ MADE 250 Ta Com- EED IS AN ORDINARY 24 EASY ° " Uses Potato FO POTATO, and that isn't hard-to ical for Ammunition 2 +40 Merely place the point of the » me Darrel of the pistol into a potato, as Motto ¥ shown in the illustration, withdraw . os Ri g e pistol ‘an re. t tainin, are be simpler. It fires quite a distance, lor Theke ick s y - os off eae = a ae like “ air guns. d Pr AN 4 es ‘2 *& Jamavement wearing these e Asimple' tha rings. Made in plati . Great Fire Eater | SQUIRT ROSE ERG i esse [finish (xo. ‘resemble pint Ne A great trick by Sas » fusely illve Sent ™ g parentiy = address tor onty tee, 3 cptes fen'kés.” ""” |Price only 280 Postpald. | h, 29 rd the horrer and com The “Little Giant’’ Typewriter is sternation of all. A First Class Writing id ite harmless. Ali ee Machine For $1.50 re a cam onnthaan A pertect little typewriter for $1.50. ~ inbox for ONLY 30e. p. pd, JOHNSON SuITH ‘> oes jot " SEEBACKROSCOPE AD Place this R he clever instru- as ment to your ks pye.youcee wees he Mad year bask ° to press to ery interesting Don't they La There is a very long | most frequently used are so uped as enable one to write rapidly, he —— = rubber tube that easily reaches to tne | 1 to 10, and the punctuation marks cn _—— With this A. 5 you ean send ed yt Qe = atin taste Borkt of your cose nee ang the yout best git irl typewritten love letters, address en slopes, sp make on e.g and do almost rd ing eyes at the back of your head. —¥ Ti one loading, ORICE 2se send a sus of ink ink and fol ip Ramee fog ina the machine. d. raat Si ~_ non 3 for 6Be postpaid. $1.50 by the world. Sena ‘Dept. 8 accep ok vin arte a pt elit JOHNSON SMITH & CO. Racine, Wis.

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180 POPULAR MECHANICS ADVERTISING SECTION WORKSHOP Electrically Operated AMAZINGLY BETTER | WORK SHOP! Heme Mochentes, Smaciow improvementoy new easy w me and sian Serene sriclen rh Tight i in you Fa Bo om Sot om 1 Daye FREE TRIAL en weir 8 man’s oy tee a completa . Jointer; “sturdy Jie Lathe; 4- wv and complete accessories for all wood operations. %, Gs Se , degree of gaves N rr before has machi = character and quality offered at such amazingly low Plans and Payments Instructions Given Complete outfit shipped to you We'll help to develop your qperorel. 10 days’ Free Trial, mechanical its. A convenient terms if service, including decide to k it—as low as and » is given. A ¥8'b4 per month. "The things you to master the art of w. make will be worth many times ing. ort a HAS monthly payments. come an expert cabinet maker. MIDLAND APPLIANCE CORPORATION Dept. 1210, 225 N.Michigan Ave.,Chicago,II1. EITHER DESIGN SHOWN. SILVER PLATE 35¢ EA.; 12 eo 9 ie OR MORE. $3.50 DOZ.: STERLING SILVER OR GOLD as a WF PLATE. 50 EA: 12 OR MORE, $5.00 DOZ:;10R2 ORS ENAMEL, ANY 3 LETTERS Ano DATE. cou GASTIAN BROS. CO, 2925 erssrunccoan ROCHESTER. N. ¥, Ship Models with. ONLY } 6%?) We furnish you with all the parts cut perfect. No trouble to fit them together and in a very little time you will have a beautiful ship model that you will be proud to own, placed on your radio or mantel and lighted with the electrical equipment that comes with each model. They give the effect of a ship at sea sailing along on the quest of adventure. Electric ic Lights 0- We have the following models, all parts cut to fit and ready to be put together, a complete diagram and instruction sheet numbered so that you cannot go wrong. Flying Cloud. .2614" long, 714" wide, 19” high. Santa Maria...27" long, 10” wide, 25" high. Mayfiower..... 30” long, 10° wide, 26” high. P= 27" long, 12” wide, 26” high. Constitution . .32” long, 10" wide, 30” high. Every Model Guaranteed Money Back If You Want It We will send you any of the above models C.0.D. anywhere in the United States. Money order or check must accompany all foreign orders. All models shipped same day as order is received. Model Woodworking Co. WE WANT MEN WHO CAN SELL We want to hear from live, ambi- tious men who can sell a high class article to businessmen and the better class of homes. We have a real selling proposition that will keep on month after month, bringing in big money for a man not afraid of hard work. The K-S Telegage is the leading hydrostatic gauge used to measure the liquid contents of large or small tanks al a distance. Experience not necessary. We teach you how to sell the K-S Telegage. Write today for full details of our selling plan. Address Sales Manager, Industrial Department, King- Seeley Corporation, 314 Second Street, Ann Arbor, Mich. Dept. D PERKASIE, PA. 110 Volt—complete plant with all OP OM ial eme Wiring, Fixtures and Lamps for LIGHTS Direct-To-You. ANYWHERI ae Oe Some, mer Homes. Also runs Household Electrical Appliances. Install it yourself. Write for circular. D, W. ONAN age $447” mM Ave. "erat Demonstration Commission checks for all money due mailed every Saturday toour men. Work full or spare time making amazing dem- onstration that will save prospects thou- sands of dollars. Demonstrator Furnished We will furnish outfit for sensational demonstration, No investment for stock -— deliveries or collections. Every one a prospect. Show in homes, stores, ga- rages, schocls, offices, and to farmers, etc. Many of our men now making $300 to $600 a month. Write at cnce to FYR-FYTER COMPANY ‘ 90-Z Fyr-Fyter Bldg., Dayton, Ohio Ten of these sensa- tional demonstra- tions a day should pay you $50 a week. No experience necessary —we show you how.

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1e i- }- al ne Lo

Tobacco lowers efficiency. It slows a man down. Makes it harder to concentrate the mind on work. Tobacco users seldom have the amount of ‘‘pep’’ and energy of those who do not use the weed. There’s many a man older than you in years who is younger in energy, simply because he lets tobacco alone. Some day, probably, you will realize to what an alarm- ing extent tobacco does undermine the system. very first dose—there is no long waiting for results. safe, pleasant and thoroughly reliable. POPULAR MECHANICS ADVERTISING SECTION Tobacco Is Hurting You Look the facts square in the face, Mr. Tobacco User. You may think tobacco is not hurting you. — Pe That is because you haven’t as yet, perhaps, felt the effects of the nicotine poison in YOUR system. For you know that nicotine, as absorbed into the system through smoking and chew- ing tobacco, is a slow working poison. Slow, yes—but sure. Tobacco Habit Banished Let Us Help You It doesn’t make a particle of difference whether tobacco has been used for a single month or fifty years, or how much, or in what form—whether cigars, cigar- ettes, pipe, plug, fine cut, or snuff. In most cases, Tobacco craving for tobacco in any formin a very few days. Not the slightest shock to the nervous system. The tobacco craving will usually begin to decrease after the Redeemer removes al] Tobacco Redeemer contains no habit-forming drugsof any kind and is quick, It is in no sense a substitute for tobacco. After finishing the When your hands begin to tremble— and your appetite begins to fail— and your heart seems to “skip a beat” now and then- and slight exertion makes you short of breath then you have a right to suspect that TO is getting the upper band. Any well-informed doctor will tell you that these are only a few of many sympt of tob poisoning. And YOU know that the use of tobacco in any form is an expensive, utterly useless habit. You know you ought to quit.

treatment, there is usually no desire to use tobacco again or to continue the use of the remedy, It helps to quiet the nerves and makes one feel better in every way. R. It G eed A single ped YE gee ‘ou, Our oi ing, mo- wosuits (Juaranteedt toc ceva ene with each full treatment. We will refund every cent you pay for th » * . ment < aer taking it according to the easy-to-follow directions, it should Dept. 300 Clayton Station St. Louis, Mo. fail to banish the tobacco habit completely. Please send, without obligating me in any way, Let d our free booklet 2 i i SEND Coupon for het ps eapt peneny' ire on ; your free booklet regarding the tobacco habit and ook Coupon NEWELL PHARMACAL CO.

proof that Tobacco Redeemer does positively relieve the tobacco habit or money refunded. , to- ther with testimonial letters from Free Proof Sen all over the country telling how they have been absolutely freed from the tobacco habit by this simple beens treatment. You could not ask for stronger proof that Tobacco Redeemer does do the work than the evidence we will gladly send on request. Just iJ Bh ascinrenscinisioumanniboaes mail the coupon—or a postal will do. eS , NEWELL PHARMACAL, co. = 4 e ayton ion t. i P yt tata uis, Mo. a BA iscneintetnentinntinmacnns —— pe —s Street and No. ..........

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182 POPULAR MECHANICS ADVERTISING SECTION Build POWER < AMPLIFIERS, ill Li . ee This NEW ke this BOOK Tells Hon

Finest Tone Quality Greatest Power

END today . . . right now . . . for FERRANTI’S AA The latest i an electne cup gun spraying machine at: tag ae ed ane Pens most as volume z : Mister Made by the makers of the Atomuster of its kind ever published. mtains diagrams, com- . : ponents and instructions for building 10 perfectly en- Hage gore powerful, more durable machune. Mameams an gineered 2 and 3 stage amplifiers ... even 3 stage ressu ush-pull for 250 and 245 tubes. F ; ou need this new FERRANTI Book if you are in- ; "prays pat, lacquer, varnish, disinfectants, *insecnades. For use terested in Amplifiers. And for Amplifiers of the finest tone quality and most power be sure to use Ferranti Transformers. They supply an undistorted output ranging from 25 to 8000 cycles. At dealers or direct. FERRANTI'S NEW Power Amplifier Book mailed for 15c, coin, to help pay production and mailing cost. home, factory, garage, dairy, farm, sign shop, boat yard, Wie for Booklet ph ‘ At your dealer’s —or us, THE ATOMISTER CORPORATION 32 Hamilton St., Rahway, M. J. 130 W. 42nd St. New York,

Suite 1012 N. Y. INC. Se $ K | A SCUPE For Xmas — Make Your Boy w rea) Happy “ee HGA LATHE t i anced, splendidly X AMERICAN accurate —a truly wonderful ma- chine at surprisingly low cost. A gift that MADE “ee FIELD HESTON a ANDERSON 612 Market St., F: , ta. GLASSES FOR P BOYS — Something New You in model aeroplanes. If you install a su- WHO parpewerss motor, with mechanical con- ols, made according to our directions our model airplane will make perfect hunt, hike, fish, motor, eamporstudy loops, tailspins, dive, zoom, fly figure 8, birds. Great for movie, theatre or : circles or any other maneuver same as field sports. Makes everything look high powered army pursuit plane. Moter 6 times as big. Precise optical quali- : can be made by anyone, nothing compli- ties. Fine finish. Leather case free. cated. Will work successfully in any fy- PYUCKESCOPE ing model plane. Complete, directions and drawings 50 cents coin. No stamps. Su Albert City, towa Compact telescope magnifies six times. Same —— and optical qualities as lascope. Supplied with leather DAIL _— EXTRA CASH BONUS case. Both at your dealer or . 7 business. ALL-WOOL sent direct postpaid. Money 7 its back guarantee. Catalog free. suse Wollensak Optical Co. 870 Hudson Avenue Rochester, New York

FACTORY PRICE SAMPLE $1.18 —» Best Knife for Mechanics, HAND-FORGED FROM RAZOR yee tit <= Farmers, and Sportsmen. 2 ay Aa 3 for $3.00 Postpaid Send for our free list and FILE TESTED. eee “HOW TO USE A RAZOR” =~ : Prtiched 1877 MAHER &GROSHCO., 106 ASt., Toledo, Oxi0 [Or

SiS2 °F Jie... 2 _

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POPULAR MECHANICS ADVERTISING SECTION 183 IF YOU SKI you already own or know about NORTHLAND SKIS To identify the fast, dur- able skis that have won every Nat'l Championship since 1917, look for the deerhead trademark. Our new booklet, “How to Ski’’, is ready. Write for your free copy. How about Northlands as Christmas gifts? NORTHLAND SKI MFG. CO. World's largest Ski Mfrs. 95 Merriam Pk. St. Paul, Minn. PRINT YOUR. OW Bulletins, Circula regan Letters, etc.— with this Amazing New “EX CELLOGRAPH” Simple and easy. Prints anything written with neil or typewriter. Just make stencil and print . Wonderful for illustrations drawn or traced. All supplies and instructions furnished. Guaranteed fe years. Prints any size from postcards to sheets 9x14. Does beautiful work. SAVE MONEY—MAKE MONEY Saves and makes money for Mer- chants, Ministers, Teachers, Offices, etc. se it to build your business. Do work for others at big profits. Write for Free Book — T: \) Shipped at our risk. Positive money- Only $39.00 © sands in use. Oa be Gs ates Easy Terms all details and easy payment plan. PITTSBURGH TYPEWRITER & SUPPLY COMPANY Dept. Me2—339 Fifth Avenue Pittsburgh, Pa. JENKINS: |. $ «4 Watch-Lighter 4°? Guaranteed 6 Jewel watch and new design elegant quality lighter inone. Watch is of excellent Swiss make, tested and ade usted. Two years’ written guarantee. jum dial—tells time in dark. Lighter fs of sturdy construction and can with one a Gives [_—— Game. Lecge fi 4 cal 'e ceable ints. legwan pn "SEND NO MONEY. Pay on Sotvers $4.97 plus catage. Satiafoction guar- New York, Gept. 12-A-23, as PANTS MATCHED! Why Throw Away That Coat and Vest? Save $25 or more! Let us match your coat and vest with new trousers and save the price of a new suit. Each pair tailored to your measure. (Average price $8.50). Over 100,000 patterns. Mailsample of suit, or your vest which will be returned together with “Cea Lares MATCH PA NTS CO. Dep t. 100, A o., . Siatches 20 W. Jackson Bivd. CHICAGO New Food Idea Pays Big Profits! Men! Women! Investigate the wonderful NEW Brown Bobby GREASELESS Doughnut. Sells like wildfire! You can easily make $50 week spare time; $5000 to year full time. Investment small. No experience needed. Write today for big special offer. Food Display Machine Corp., Dept. 3-W, 500-510 N. Dearborn St., Chicago ih =: DUO=-PAC is a Whirlwind Seller Duo-Pac holds package cigarettes, also regular book matches in special slides onside. Variety colors bakéd enamel also plated. Most con- venient little article ever invented. A sale ev e shown with profit. Beautiful gift men and women. Nothing like it. Write for full particulars MUTUAL SERVICE FACTORIES Petonts Deading Desk 22—522-24 McKnight Building 3 tor $1.00 Minneapolis, Minn. 5 SASL ome ara FREE/ This Big SAXOPHONE Lesson Illustrated —explains all about Ba True Tone Saxophones Write today for the Buescher Saxophone Book. See the first lesson chart—look over all the different saxophones—get acquainted with the many strictly Buescher features that make the Buescher Saxo- phone the easiest of all instru- ments to play. Easy to Play Easy to Pay Learn why you can be playing popular pieces within two weeks and be able to take your place in an orchestra at the end of three months. You'll find it possible because only a Buescher gives you all these features: _ p-on pads. —Patented automatic octave key. —Perfect. scale accuracy. —Convenient key arrangement. —— stay in one playing posi- tion. These features are explained fully in the new Buescher Book. Be- sides being easy to play, we make it easy to pay for a Buescher. A little down and a little each month makes it possible for you to play while you pay. SIX DAYS’ TRIAL After you have read the Buescher Saxophone Book take any Saxophone or other instru ment on 6 days’ trialin your home. See it— play it—hear it—convince yourself that you can master it. Write today for free copy of the Buescher Book—use the coupon. BUESCHER BAND INSTRUMENT CO. Elkhart, Indiana BUESCHER BAND INSTRUMENT CO, (547) 1 2957 Buescher Block, Elkhart, Indiana. | Gentlemen: Without obligating me in any way please send me your free literature. I am interested in the SoU MENUTUIROES. oo occ csc cccccccccccvcesccgccoocesoes ] DL, a5 ccb pnosetestecsensesecetedececeoeeguesesqgeune | ee ces ee ee ee ees ee eee ese ee eee ee

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184 Weighs Only 4 Pounds coeaall Universal Motor oe Write for our catalog showing complete line. POPULAR MECHANICS ADVERTISING SECTION Enjoy Weighs Only Four Pounds Yet will do a better, cleaner, quicker job than a large drill for light and intermittent work. Sturdy, practical—an electric drill specially built for tight corners. Guaranteed fully for one year. The ideal drill for garages, woodworking shops, machine shops, and wherever light drilling is done. Uses direct or alternatiugcurren and is supplied to you for 110 to 128 volts, 200 to 250 volts or-32 volts. Fitted with a special Jacobs Chuck. Boreupto 4". Stop and start switch in the handle. Comes complete with 10 feet of cord and socket. Price post- paid anywherein the U.S.A.—$18.75. Send check or money order. If not satisfied return in 5 days and money will be gladly refunded. In ordering, be sure to specify voltage used. Jones Motrola Sales Co. Dept. 9, 370 Gerard Avenue, ew Yor! Grid, Complete Chicago AY 7 GRID models A.C., operated sets—beautiful consoles, accessories, —all at wholesale prices. 509 So. State St., Dept. 110, Chicago | CATALOG Write for latest cat- alog just off the press— 148-page book offering hun- dreds of radio bargains —New Humless Screen all-electric and battery parts and kits 5% Salvage Stock Store sets as low as thelhrill of Flecs,; fi @ADIO at Small Coss 7 Make Good Reception Easy Thousands of users marvel at the difference in reception with a Townsend “B” Power Unit. Full, sweet tone, clarity, volume and greater distance are among the many advan- tages reported daily. Townsend “B” Power Unit Hooked up in a few minutes: just plug into = light socket and forget it. De ya up or A.C.— —- to 1 volts on any set—D.C. any cycle. Approved and Passed by the rigid laboratory &é tests of *‘Popular Radio” and *‘Radio News.” Over 150,000 Now in Use Com There's no longer any reason for putting up with the expense and undependable perform- py a “B” Batteries—when you nagood “B’’ Power Unit for HAS ONLY $6. Bo. Over 180. of yey = WORDS OF PRAISE Power Units now in a su Please send me enother Elim- stantial proof of satisfaction. inator. I have had one of your Eliminators in constant use ona TRY IT FREE! 5 tube set for over two years and have only words of great -/ are so sure the Townsend will do all praise for it. An accident with claim for it, we give you the privilege it is my reason for wanting an- of trying it ten days at our risk. A new other assidy, Fone 531 Sterling Place, Frcctiye, N.Y TOWNSEND LABORATORIES 715 Townsend Street Chicago, Illinois Ya THREAD CUTTING LATHE — S. REAL Lathe. 9” swing; 30” between eocin t ,. mend ond Corum. a uments an toolsavailable. wre today for 2” Band Saw Ctreular an Powerfu 2 practical. Not a toy. Prices on these Has tilting table. Pri $30 and other ma- B b ings. es. Special —10 Months to Pay SAVE $25 TO $100 All Electric With Dynamic Speaker Screen Grid Tubes The Ranger Radio is a result of7 years’ development. It is to-day fast becoming the most favorably known radio—now leading the field, as its predecessor, the Ranger Bicycle, has for 30 years. The Screen-Grid Tube Ranger Neutro- Sone come 6 $ sebew with 2 No. 245 tubes “Push-P’ is licensed by R. C. A. | pat, you of Aad, recep- tion from near and distant stations. You may now own one of these distinc- tive Rangers with Dynamic Speaker in : Deluse Conse’. kd Laying io sow an 1 Own an alance y months, Table models as low ss $40 tor big cataiog Rangers come all ready to re insert tubes and plus, into your clectric ent socket—no more trouble than to connect an electric a oe as been known for Ranger Pree CYCLE CO. —— yard for 30 Yea Write for marvelous new intreductory offer—easy terms DEPT. 3173 CHICAGO

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iy iog POPULAR MECHANICS ADVERTISING SECTION 185 tube voltage. Improvestone, sensitivity, volume. For every tube. $1.10 with mounting (in U.S.A.). At all (AMPERITE Grporation 661 BROADWAY, NEW YORK FREE—"Amperite Tu: Chart.” Write Dept. PMi2. i FREE RADIO ‘\DVIC and infor- TODAY FOR COPY on your, copy of this great ide and catalog AB- SOLUTEL ‘EL REE. Don't i this offer! Sienply med, will il do. But you. aia ros WHOLESALE RADIO SERVICE CO lA +) Me eee C-1l 8a a, Not merely a product; nor again an entire line of products nor still again a resistance for Ly 4 pees. More than ali that, it is the name of a service ded AIDS TO BE TTER RADIO ranging from improved wave interception to detector action, radio and audio amplification, volume control, tone quality and r. = pees a, Ly and onpertmnentes applications. your dealer CLAROSTAT mre. CO., Inc., 288 u. 6th St, BROOKLYN, “1 Y. Every Electrical Connection necds Solderall f v perfect receptic The SOLDERALL CO NEWARK NJ 'Gitey(aomtyi 1200} | OAL AY oe SEND for our_wholesale 1930 catalog. Filled with amazing values in screen grid radios, 245 pte 4 pull audio’ Ta- dio consoles, kits, parts. Guar- anteed merchandise at whole- vale prices. WESTERN RADIO MFG. CO 2S | ST W LAKE CHICACO ILL JB =a 19? 1s, sw Qegiend ake OBL i many L Lay ore env ASSEMBLE Your Own SHORTWAVE RECEIVER Seventy-eight stations in 21 guumtries and 49 in the U. S. broadcast os on shortwaves. Listen entertainment from — a. ce, —- South Africa and oven Japan and Australia. waves Carry maoy times farther than long waves. mame | “Tt = complete in all details assembled -§ 4 mn Dat K aS pbk ETEOSE Veadannsondes et "4 mplete, assembled se oan arpa ctaheginye Ha — BAIRD 4 4-T Kit—Detector, 1 stage screen grid stages Audio, complete, assembled in2 hours... Ri dise OCTOCOILS %.°""" Set of and most = shortwave coils; i our TOCOILS ge Bakelite — with Nos. 12-14-16-25 enameled w If your enon cannot or will not supply you with our parts, we will ship, prepaid on receipt of price. SHORTWAVE & TELEVISION LABORATORIES, INC. 70 Brookline Avenue Desk 31 Boston, Mass. ADJUSTABLE SLIDING TRUVOLTS TRUVOLT is the SAFE Resistance for radio battery eliminators and power packs. Built for accuracy and durability. Heavy nichrome wire cleverly wound for direct air cooling. Fixed models have sliding clip, ~~ set for exact value -_ All usual sizes. TRUVOLT Variable has a knob-control and one hole mounting. Lasts longer owing to endwise travel of contact over wire. 22 sizes $2.50 each. 175 Varick St., New York. N.¥. Mail coupon for data

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186 ture of a Name of emplo Soutidential. _employer. er work, - oe ae. long No "Eientes to" ‘ POPULAR MECHANICS BSTOO 4, Brings Your 4 al) (hs > MONTHS TO PAY : O80 AY GIETS WE ee teeters IAN » wLORPORATED Dept: Waa 1670 Broadway New York. N.Y atches and ° e737 for it Dat, ADVERTISING SECTION 4 i. ses 99 Vi, iden, Something Foy original idea—never before seen on the market. Every man and boy a prospect. Hook-Fast Belt and Buckle made to individual order—no two alike. Every buckle with personal initials and emblems—accordi to individual taste. Splendid fits made easily—HANDSOM SELLING OUTFIT FURNISHED—contains actual samples Become the official representative of Hook- —_ Belt and Buckle in your locality—Make big money—Sells itself. Belt made of genuine English cowhide—never wears out— Buckle made of attractive plati-croyd—iasts a life time, bright and untarnished—Specially patented Hook-Fast catch never slips. Red-Hot selling proposition. Get in on it now! Write for free portiowart, ATIONAL CRAFTS COMPANY 20 West 27th guest. Dept. B-126 New York City YOUR TREASURE SHIP! Get this yellow book crammed with golden ideas. Follow a hobby that turns spare hours into money. True hand-carved ship models built from Hancock parts are readily sold. See Nancy Lee and Jumbo. Send 10c for copy right now. ROY HANCOCK 323 Douglas Ave. Portsmouth, Va. Rincis MoKes SCIENTIFIC NOVELTY CO FREE 98-£) PARK PLACE.N.Y.C STAY Ghia Ordinary Kerosene most startling heat urcteciag G burner ever made. I farm, in: Tochery. for polling. cooking, and heating. Ideal for Think of it! Improved of burner ‘Burns OUTDOORS = meat halfthe emt Horaaleto as (Bans aurooons desired d and ble generator assures without shut-downs. Nothing to wear out. Starts ina jiffy. Will last alifetime. Every burner fuliy to give complete satisfaction. “I would not take $600 for it if I could not potanct , Mic an eee pe wel Ord a, set." *J.B.A roduces 4 heat and saves lots of aceoene 1d fo Kis Kistler, Pa. Also Burners for Cook Stoves and Heaters -O-Gas Burners. of Improved Therm-0O. HOME MFG. CO., Dept. 3813, 20 E, Kinzie St., Chicago

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ut— City I

POPULAR MECHANICS ADVERTISING SECTION 187

Sells for $1.25 SEND ONLY 39Cc Doz. $3.95 Gross $39.60 AGENTS BUY DIRECT FROM IMPORTERS! AT WHOLE- SALE PRICES. MAKE $10 10 $20 A DAY EASY

Dakss Coal VEST OW Shin

No. 285—A special patented clip enables you to fasten anywhere as illustrated. May be used as a necktie clasp. Very attractive, comes in assorted colors. Sells for WHOLESALE SAMPLE 10c. DOZ. 95c.

ry LALIT Try,

Mends all metals, except aluminum. Excellent for radio work, mending of pots, pans, kettles, etc. ——~,» & clean the parts to be mended. Put om Spors Simple Solder. Apply heat. The job one. Instructions in each Sells for 35c. WHOLESALE SAMPLE 18c. DOZ. $1.75.

All you do i is wind the ag and the fun be- gins. Made of heavy gauge metal. Face and arms are black, apron is white. Other danc- ing dolls in imitation of Santa Claus, rabbit, or dog. Sells for 35c. WHOLESALE SAMPLE 23c.

. as —_ Ss No. 216—-COMBINATION bp soi ped ~~ ae —_ es and scissors; cuts glass and o 7 useful tool. Setis for i WHOLESAL SAMPLE 1Sc. DOZ. $1.20. ed in brink color. When the ball is pressed the tongue and ears stick out making you laugh. A real fun maker. Sells

WHOLE- SALE SAMPLE 10c. DOZ. 65c.

No. 281—PENCIL SHARPENER. Sharpens standard size pencils. Will not break the lead. Blade can be removed and sharpened. Conveni- ent for pocket, home, school, and office use. Sells for 15c.

WHOLESALE “SAMPLE 9c. DOZ. 67c. No. 33p —Twenty- four inch necklace. Has rhine- stone set clasp. All uniform graduated pearls. Very at- tractive, closely re- sembling the genu- ine, also have 72 different kinds, styles -—<— —s. of beads, write, tot prices WHO SALE SAMPLE 1 15ce. DOZ. $1.56.

MONEY BACK IF NOT PLEASED. Goods that do not please you may be returned any time within 60 days from date of purchase for refund. F. SPORS & CO. 1029 Main St. LESUEUR CENTER, MINN. FREE Upon request, our wholesale catalog showing over 400 fast sellers, the world. from many parts of Many ideal Xmas gifts shown.

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188 POPULAR MECHANICS ADVERTISING SECTION Thank you for making it possible for me to own a 21-jewel Santa Fe Special, writes thousands of our customers. Buy Direct Our catalogue is our showroom. Any watch will be sent for you to see with- out one penny down. No obliga- tion to buy. Save /; to */2 on the price you pay for a similar watch made by other Manufacturers. Most liberal offer, Our “Direct to You” offer aud Extra Special Distribution Plan is fully explained in the New Santa Fe Special Booklet just off the press. The “Santa Fe Special” Plan means a big saving of money to you and you get the best watch value on the market today. Watch sent for you to see without one penny down. Railroad Accuracy Beauty Unsurpassed the famous “Santa Fe Life-long Dependability Special” Watch. These watches are now in service on practically every railroad in the United States and in every branch of the Army and Naval service. Thousands of them are distributed around the world. You will never miss the few cents a day that will make you own one of these watches.’ ® Send coupon for our New ‘Watch Book— Just Outi just off the press. All the newest watch case designs in white or —all are combined in the highest degree in een gold, fancy shapes and thin models are shown. Read our easy payment offer. Wear the watch 30 days FREE. SANTA FE WATCH CO. Dept. C-6 Thomas Bidg. Topeka, Kans. SANTA FE WATCH CO., Dept. C-6, Thomas Bidg., Topeka, Kansas. Please send me your New Watch Book with the understanding that this request does not obligate me in any way. Dr. Wu Famous Chinese magi- cian, the originator of the Block and Ball trick which mystified the world. This trick, now con- tained in Set No. 2 of the Knapp Master Magic sets, is one of the manyfamoustricks included in this series, ¥Fellows...bea i real Master Magician y@ts achance to give real magic shows all your own. With the Knapp Master Magic Sets you can now do as famous magicians have done — pick things out of the clear air — make coins disappear—escape from locked chains— use the magic wand —these and many other feats of magic are yours for the asking. All of the world famous tricks in the Knapp Master Magic Sets are easy to do, yetthcy will com- pletely mystify your friends. With each set you get the ‘Secrets of Master Magic’” in- struction book. You can’t go wrong after Set No. 1 Price $1.00. Set No. you'veread it. It’ s easy as ABC. This is your 2Price$3.50,(Iilustratedabove) one big chance to be the Master Magician of Set No. 3 Price $5.00 your Neighborhood.Getthe setsatyourlocal “Slightly higher Denver@'West” dealer now—or if he haso’ tthem, write tous, Send for free booklet “P” KNAPP ELECTRIC, INC. 3029 East WashingtonSt. Indianapolis, Ind. — — 2. Trane LOOK FOR THIS TRADE MARK ON ALL KNAPP MASTER ) ‘21= wonDEni 10” swing, 25”, 35” and 45” centers. Weight 60 Ibs. Biggest lathe value yet. nd 6c for 32 page catalog on lathes; saws, etc. Largest line of small lathes in America. SYPHER MFG. Co. Dept. D-12 TOLEDO, OHIO GOVERNORS To control speed of any make of auto engine, regard of changes, when as @ stationary engine. Driven by flat or V belt. Driving pulley, 34%"dia. Governor speed range, 400 to 2000 r.p.m. State imate speed you desire. The Governor is built to be easily attached to any make of engine. Fully Guar- anteed. $10. with order or sent C.0.D. with examination privilege. c. S$. GO. CO. 215 No. L. A. St. Los Angeles MODEL SHIPS Would you like to build a real fine ship model? We can supply construction sets and all sorts of parts such as semi-finished hulls, blocks, dead- eyes, special flags, anchors, steering wheels, capstans, figureheads, blue nts, books, etc., for building a Flying Cloud, Constitution,Span- ish Galleon, Mississippi River St boat 3 ereign of the Seas, Mayflower, Bluenose, Half Moon and many others. Also special construction sets for rac- ing sail boats, power boats, model steam engines, propellers. ete.. and fine tools for the model maker. Our large 48-pace photographically illustrated book- let contains valuable information and hinte for building ship models in addition to Prices and full description of the above articles. Many people only slightly inter- ested in models have become greatly enthused upon receiving this booklet. copy will be sent postpaid upon receipt of 15 cts. (coin preferred). Whether you spend your spare time in building a ship model for pleasure or profit, you will find this work to be the most interesting and fascinating hobby in the ° Model Ship Supply Co., Dept. A, Mineola, N. Y. Sov-

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WY sall agic lave aake s— ther ll of aster om- L set after your in of ocal US, nd. > vile

POPULAR MECHANICS ADVERTISING SECTION 189

10 ft. Cable with sep- arable Plug. Planer and Saw may be pur- chased separately — $25.00 each.

——— A HOBBY that o offers relaxation from everyday cares—bringing pleasure and profit. Thousands of men have adopted the Workace hob- by. Make hundreds of things with the Workace Electric Woodworker. Under the magic of the whir- ring saw, planer, lathe, sander, drill, grinder and buffing wheel (all included in the Workace Wood- worker) raw lumber is easily converted into furni- ture, household necessities and countless other articles. Work out your ideas with your own com- plete electric workshop. There’s no better gift for the growing boy than Workace. It provides a wholesome man-building outlet for his 4 and enthusiasm. Man or boy will appreciate Workace. $9 down will bring it. Send coupon now for details. J.D.WALLACE & COMPANY Adams Street at California Avenue, CHICAGO 11 W. 42nd St., New York 268 Market St., San Francisco Consult telephone directory for branch addresses in other cities

eee ee — J. ALLACE & COMPAN 5 Ft. Workshop 9 Adams St. at California Ave., Chicago, I INCLUDES > > Please send me fuli information about Ay Workace 4” Planer, 8” Circular sppcume ———— the Workace Ma- Saw, 6” x36” Lathe, =e Werkass” Workace 8” Disc Sander, 6” be Jig Saw Band Saw | Buffer ,5’’Grinder, 4” Workace Workace Workace Drill Chuck, { H.P. Shaper Planer Radial Saw G. E. Motor, 110 V., 2 1 A.C., 60 Cycle. End- Name. ..ccccccccesccese PPUTITITiTiTiTrTriiiy lessV Belt, T wo 2-step | 4” and 2%" Pulleys. SEED « ccb ve cedbenedbenecesbbvasecesbedbece i Cast Iron Sub Base. ' Jig Saw Attach- . t for the | tre Woed-$9 - — Workace meet Saw, sare one any "$440 Cast Cron Table $10 oes Cast Iron Legs $15 Ex A maies pole motor §60

AMAZING NEW TABLECLOTH LOOKS LIKE LINEN WASHES LIKE OILCLOTH | New material rivals Irish linen in without laun-

AGENTS - 1S15 ot easy! ry Write f"dFs mente. onan Tail detaile. | industries, eT EL Lake, Dept. 15-1 Chicago 2: Tons HEATS 6

“Our Bulldog Furnace uses only 2% tons to heat 6 rooms!” So writes Frank H. Taylor, Dunning, Neb. Many users report saving \ to % their fuel. The Bulldog comes com- pletely erected. Sent free for inspection. No money down. Small monthly payments. Write for big free book! Address BULLDOG FURNACE CO., Dept. 13-59, 19th and California Ave., Chicago

School Go to High School this easy, inexpensive way at home. 15 fascinating “*Ques- tion and Answer” books is your complete education !

High Think of it—only $19.85 on easy month- ly payments— for every subject. Now used in 12,000 High Schools. Certifi- cate awarded. Send for FREE Book Learn how you can prepare at home for big- ger business and social success. Send this ad with name and address for FREE booklet, “isi, ° High School Home-Stud 31 Union Square, I Dentesa7ohew York (LY. Easy Terms

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190 POPULAR MECHANICS Mechanical Engineering Learn at Home Mecuantcat Engineering embraces the design, construction and operation of machines and machine tools. It is a pro- fession which offers almost unlimited opportunities to men who combine natural mechanical ability with technical training. For this is The Age of Machinery. Almost every conve- nience, luxury or necessity which we enjoy depends on ma- chinery for its production or adaptability to our needs. Every new invention multiplies the opportunities for competent de- signers, builders, erecting engineers, etc. One of the best ways to train yourself to secure a position as a Mechanical Engineer is through the home-study courses of the International Correspondence Schools. These courses are complete and up-to-date, and especially arranged to meet the needs of the student who studies at home. They are particularly helpful because they are written by ‘well-known mechanical engineers with years of practical experi- ence, who know the quickest, best way to solve every problem. Just mark and mail the coupon and we'll gladly send you Free Booklets describing the I. C. S. courses in Mechanical Engineering or any other course in which you are interested. NTERRATIONAD. a ag at ng id SCHOOLS 656-F, Scranton, Pen Without cost or ya ey Please send me os copy of your book- let, “Who Wins and Why,”’ and full particulars soot the course before which I have marked X in the list below Mechanical paeote 5 ‘Toolm akin — Cour: i] Blacksmithing and Forging Mechanical Drawing = Shop Practice Architectural Draftsman Building Foreman Concrete Builder Contractor and Builder Structural Draftsman Structural Engineer Electrical Engineer Electrical Contractor Electric Wiring Electric Lighting Electric Car Running Telegraph Engineer Telephone Work = ~ nn urveying and Mappi Bridge Engineer on Gas Engine Operating Foundrywork Machine 2 Shop Pra Plumber and oases “Fitter Plumbing ) ad Foreman Plumbe' Heating and Ventilation Sheet-Metal Worker Steam Engineer Marine Engineer Refrigeration Engineer R. RB. Positions Highway Engineer Chemistry () Pharmacy Mining Engineer Navigation () Assayer Iron and Steel Worker Textile Overseer or Supt. Cotton Manufacturing Woolen Manufacturing Agriculture () Fruit Growing Automobile Werk C Aviation Engines Mathematics EyRadio BUSINESS TRAIHIEG _covnees Business Management usiness Correspondence Industrial Management Show Card and Sign Lettering Personnel Management Stenography and Typing : Patternmaking affic Management Reais Accounting and Civil 8 C. P. A. Coaching Railway } Malt Clerk Cost Accounting Mail Carrier Bookkeeping Grade School Subjects Spanish () French High School Subjects Salesmanship Cartooning Advertising Illustrating EE SIN Tiaetalipctiabadlindlibdscesvccsnsedseevinceuvellcgsbertestetcessinecestessaetnsacdveseeeananes EN EE ee Occupation If you reside in Coneds, send this ¢ coupon to the Internationa - Correspondence Schools Canadian, Limited, Montreal, Canade ADVERTISING SECTION MOTOR BARGAINS Heavy starting duty, 110 Volts, 60 Cycle Single Phase, 1725 Speed, General Electric Repulsion In- duction MOTORS in original cartons. 4H. P. only $1350 1/¢ H. P. $4 250 1/3 H.P. #159 These motors were built by the G. E. Co., for a con- cern that failed before delivery could be made. W e purchased 1500 cf them at a very low price. You can buy one or more at prices quoted above until stock is exhausted. Fur- nished with feet or rubber cushion base. Shaft diameter 54 inch. Pulleys 75c extra. Grinding and buffing , wo spindle $1.95. Six inch by % grind wheel $1.7 Cotton Buffing Wheel 60c. OTHER MOTOR BARGAINS We have a large stock of new and rebuilt motors. Write us your requirements. We can save you money on any type and size motor. NORTHWESTERN ELECTRIC CoO. 410 So. Hoyne Ave. CHICAGO, ILL. on Nationally Po 21-JEW. EL—Thin Model = sold Imagine being able to pur- chase these magnificent thin model watches at lowest ; If you write at once we will send beautiful style book, showing lowest f. prices on these lifetime — watches. Thous oo money this way. Writetoday WRITE! Laxurious strap and bracelet //// watches at remarkably low# ices! Write for free sty TODAY! ha R WATCE COMPANY a 4A. tr, a century of fair oun Sor ‘NZ.103 South Bend, Indiana Canadian Address: Windsor, Ont. ese) ” A © we 2 Oo ers & i >a

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POPULAR MECHANICS ADVERTISING SECTION 191

ip

Chock Full of Real Money-Making Facts! ND it will do the same for you! Aill I ask is a chance to prove it. If you are the sort of a fellow who is content to grind all your life for poor pay you’ll not be interested in what it has to tell you. But if you are looking for an honest-to- goodness opportunity to earn more money —if you look forward to having a business of your own—if you really have THE WILL TO WIN— Then you owe it to yourself to send for this amazing book. You have never read anything like this straight-from-the-shoulder, intensely hu- man story. Read it and find out how 7143 men—average men, just like yourself— men with the same problems you are now up against—read how I helped them ac-

This Book Has Shown 7143 Men How to MAKE MORE MONEY complish exactly what you would like to do. Read and be inspired to action. Your spare time a few evenings a week is worth money, real money. I am ready to pay you for it—from $25 to $60 a week. And you can keep your present job. I don’t ask you to take my word for it. I'll give you the names of men who are doing it every day. My plan is simple— thoroughly tested and proven. The facts are there in the book for you to read and judge for yourself. Investigate. Send for this book and get the whole wealth-bringing story. Convince yourself that I can help you make extra money. Start now by mailing the rae Be sure to give your county.— J. Matheson Bell, Pres. PA ,

See for yourself the record of a man who has made | oy Ss ‘- | $10,900 out of Ozarka. And another who made 7G yo | $1750 last year; another $1645; another $1848; and 2 oe? : so they go—$1212, $1708, $1028 for last year’s ; oe oe ca af ‘work. Hundreds of them with their names. Make \ © , fe 8; em sal me prove that what they have done, you can do. | °* Sr a | OZARKA, INC SEL 9 * r “ty gp* a 122 Austin Avenue, Chicago, Illinois YS ii. ci

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192 New Moisture Humid for all Makes of Cars, Trucks, Tractors and Engines An amazing NEW Scientific Vapor Humidifier and GAS SAVER has been patented throughout the World that beats anything ever gotten out before. It makes engines run ALL THE TIME with the same wonderful efficiency they do on a cool moist night. It gives MORE pep and power—HIGHER topspeed—auto- matically ELIMINATES hard carbon from engine—and causes engine to give AMAZING MILEAGE RECORDS NEVER EQUALLED BEFORE. ENTIRELY UNLIKE ANY OTHER DEVICE. This startling invention is radically different from every other kind. It uses MOISTURE from the radiator and makes the car run like on a damp cool night. It isGUARANTEED to save trom \% to \% the gas and oil, stops boiling and steaming, makes engine start easier in all kinds of weather, and completely de-carbonizes the engine as you run. POPULAR MECHANICS ADVERTISING SECTION Man with Car Spare or Full Time $360 to $1500 a month 1 man $4,939.66 in 3% months Another $1,656.60 in 58 days $5,160.00 in 6& months to another. BIG MONEY can be—I!S being made Fitting Motors With Vix One man sold 8 first morning Another selis all 3 men can install Ancther’s profits as high as $100.00 a day

VIX sells itself by 8 STARTLING dem- G, STUNNING is new princi device has been extensively tested out by Technical Engineers rr pe Thy MELEE ALES and Experts and found to give vastly more mileage, with largely increased Successful VIX men make MORE MONEY power - With it the engine used approximately $07 air, 6% _ of gas. Free Tria Gas Saver AT MY RISK Try this wonderful VIX Moisture Humidifier and Carbon Eliminator AT MY RISK on YOUR OWN CAR to prove that VAPOR MOISTURE (drawn from Radiator to Engine) gives you that wonderful night driving effect ALL THE TIME with MORE mileage from gas and oil—eliminates hard carbon accumulation—gives MORE power, a SNAPPIER, PEPPIER motor, FASTER acceleration, a SMOOTHER, QUIETER running engine and HIGHER top speed. VIX will PROVE ITS MONEY SAVING MERIT on your own car by 8 DEMONSTRATIONS —conducted by yourself AT MY RISK—the most SENSATIONAL, most ASTOUNDING, most CONVINCING DEMONSTRATIONS you ever saw. If you don’t find from your tests that it does MORE than I claim; return it and it COSTS YOU NOTHING. | want wide-awake hustling, County, State, Province and National Agencies everywhere, part or full time, to make $350 to $1500 per month filling the great DEMAND for this wonderful invention wherever introduced. Write for my FREE TRIAL and MONEY MAKING OFFER. Use coupon below. WALTER CRITCHLOW inventor and Manufacturer, 805-W 8 Street, WHEATON, ILL, U. S. A. . Offer al Ow WALTER CRITCHLOW, INVENTOR and MANUFACTURER, 805-W 8 Street, Wheaton, IIl., U.S.A, Please send me without obligation or charge your FREE TRIAL and MONEY MAKING VIX OFFER. and pep from the engine. and ONLY than they ever made before TRY This New Principle

Pictures here and at top show Model “B” VIX attached to my own New Model A Ford. This car is wonderfully improved i rformance with the VIX Moisture Humid- ifier. So is every Auto, Truck, Tractor, Taxi, Bus, Marine, Stationary and Aircraft Engine, both American and all Foreign makes. GUARANTEED TO |

Ps ddabundesdedebeskbsice<cosdheodeel SAV E) S682 iitne Engine Repairs ae tn i ek NS gga Ae or Costs You Nothing a re

POPULAR MECHANICS PRESS, PRINTED IN U. S. A.

PA What ¢ you cor dren th long fu: ment? Love ove of ciation « in life, | to give that lov: dious pr instrum Xylorin No tea Practice Reme mba is product establis! century that sta: cromise Ser BIG B _

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Start to Play Very First Day PARENTS! What greater gift can you confer on your chil- dren this year than life- long fun and entertain- ment? Love of music means love of home, an appre- ciation of the finer things in life. Here is a chance to give your boy or girl that love without the te- dious practice that most instruments require. The Xylorimba is easyto play. No teacher is needed. Practice is actually a joy. Remember, the Xylor- imba is the guaranteed product of a company established nearly half a century ago—a company that stands back of every cromise it makes. : wy a ‘han oy lh ~~ pais ~~ ~ ~ 7 "THINK of the best Christmas gift you have ever received. Multiply the pleasure it gave you by ten, and still you have only an idea of the joy you can give yourself this Christmas if you act at once. Start to Play the Very First Day! Haven’t you, like millions of others, envied the fellows who “bring down the house” with snappy xylophone or xylorimba numbers? Haven’t you longed to create your own music, to be looked up to wherever you go, to be able to make real money in sparetime? If you have, this ad spells O-p-p-o-r-t-u-n-i-t-y. The xylor- imba—wonderful for home,indemand at dances and gatherings—is nevertheless the easiest of all instruments to play. In fact, on the very day you get yours you play simple melodies, even if you can’t read a note of music right now. In afew weeks you astonish your friends and fam- ily. All your life you have the joy that comes to those who can entertain. Plays 20 Minutes; Gets $20! Ralph Smith Chicago, played twenty minutes at wedding; his “ pay” was Ay Altho o- 12, Turk McBee, Jr., plays big ~t. vaudeville ex- clusively. Harry Breu- er, New York, has made thousands of friends ive his xytosbone selections on the radio, L.E.Hallm ead ing, Pa., writes: “Made $300in5 weeke—apaee time. And now J.C. Deagan, Inc., (world’s largest manufacturer of xy lophonic’ instruments) has made it so easy to own a xylorimba that noth- ing stands in your way. Sizes and styles to fit every age and pocketbook. A five-day free trial that eliminates risk. Free, easy lessons that make teacher unnecessary—and, best of all, such easy paymentsthat theyare hardly noticed. Will You Investigate? Everyone wants to bepopular. Everyone wants to make extra money. Everyone wants to be center of attraction at gatherings. But these ad- vantages don’t come by themselves. Oppor- tunities must beseized. This is your oppor- o tunity — will 70 iu pass it up without in- ¢ vestigation? The accompanying cou- 4 pon will bring our big FREE book ¢ to your door. It tells all about .@ the Deagan line, the free trial, the easy payments. Remem- ber, no cost or obligation! rs Simply fill in and mail the coupon— but do it rs before it slips your _¢ = é: s mind. Today is 4? .Y ¥ «< as good a gay 3) ree Revd Do i eS

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With the Same BI>+« —and Still Going Strong ee of it! 365 keen, cool shaves a year—and not one penny during the whole Seeel hat's what an amazing a shaving invention did for J. W. Starksbury of Oklahoma ! And W. D. Carroll of Pennsylvania got two solid years of slick shaves out of an old blade that was just oe worn out to begin with! No wonder > everywhere are simply astonished ! KRISS KROSS—the remarkable invention t nape such long- distance shave records possible—deserves to be called much moze than a stropper. Rather it isa super-stropper or blade rejuvenator. Almost literally, it makes a new blade out of an old one every day—makes hundreds of keen, q uick — blossom baer only one grew before. Until you've seen KR KROSS and tested its uncanny ingenuity, you'll never know gv really sensational it is-! MAGIC DIAGONAL STROKE KRISS KROSS ploys the diagonal stroke, same as a barber uses. Never before has anyone captured the secret of Teproducing this strokeautomatically. Eight “lucky leather grooves’ do the trick in 11 seconds with a erection it tahoe a@ master barber years to attain. But that’s not all. KRISS KROSS embodies still another feature that has hitherto baffled mechanical reproduction. It strops from heavy to light. It's absolutely uncanny the way the strokes grow lighter and lighter until an adjustable, automatic jig flies up and notifies you that ow bi is ready—ready with the keenest cutting edge that steel can take! NEW-TYPE RAZOR BLADE FREE! Tointroduce KRISS KROSS stropper, we are including this month free samp!es of a revolution in razor blade construction. Made to fit your present razor. Guaranteed to last longer and shave better KRISS KROSS KRISS KROSS CORP. 1418 Pendleton Avenue St. Louis, Mo. "gest Manufacturers of Mechanical Stroppers. Canadian Address: ADIAN KRISS KROSS CO. ton Street East, Toronto 2, Canada a ow other. Expect a new shaving sensation —KRISG des are made of a unique steel, made a new and GET FREE CFFER! “4 Send for fullinformation on these surprising new invention KRISS KROSS products are never sold ia stores. Youd with me or my authorized representative. Write for description and full details of free razor’ ‘> offer. It's remarkable than I can tell you in this . space. Clip now. Mail it today. Makes Ses "5 “DA Make big money with KRI. sg ' FREE razor blades boosts ae tag . ie made $66 in one day. SPARE-TIME workers, OFFIC make $6-$12 extra in a day friends and fellow employee bottom of coupon and maii KRISS KROSS CORPORA 1418 Pendleton Ave., St. L« Send me details of KRISS Ki > u sample of your new-type razor blade for Razor. (Fill in your make of razor.) *714, . Also send FX, PPPPPIITTTTTTITITITITTTiiTiiiiiiitit 0 Cheek here for agents’ money-making plan, full time hours. Fe RE EL NESE

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