Popular Mechanics 1925-06: Vol 43 Iss 6

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7 DAY BOOK NOT RENEWABLE§ i’ YO 8g REET EE OE ET Fe “ erewet a” > PUBLIC LIBRARY | a RSs v aff wi a eh Sapte a 4 a eh 5a ee eK] ey Fat, : ay ; +. 39 i, 4

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Popular Mechanies Magazine 200 E. Ontario Street, Chicago, U.S. A. H. H. WINDSOR, Founder H. H. WINDSOR, Jr., Editor and Publisher London: Hachette & Cie., Paris: Hachette & Cie., Melbourne: Gordon & Gotch King William Street, Charing Cross, W.C. 2 111 Rue Reaumur 509-513 Little Collins St. 33UED MONTHLY SUBSCRIPTION: SINGLE COPY, 25 CENTS In United States and its possessions, also Canada, Cuba, and Mexico, per year, postpaid - $2.50 To all other countries in the Postal Union - : ° ° - 3.00 All subscriptions are discontinued at expiration. res examine the die pe on your wrapper. Entered as Second Class Matter Sept. 15, 1903, at the Post Office at Chicago, Illinois, under Act of Marci: Srd, 1879. , Entered as Second Class Matter at the Post Office Department, Canada > > ed monthly by POPULAR MECHANICS CO. Copyright, 1925, by Popular Mechanics Co Copyright {n Austratia Copyright in Frenee SS — . 43 Contents for June, 1925 No. 6 jents—children killed in auto accidents 935 Coal—try to make smokeless coal 989 ertising Cross Word Puzzle—indicator guides fans 885 atch artist sews poster ads from colored rags 948 Dams rindow display changed by traveling shelves 992 big tank safety valve against floods 94? piane built only to be burst in test 946 fe belts carried in plane 934 Decoration and Ornament naed to bus line 993 art works from baby shoes 907 ips—rain acts as airship ballast 968 art wrought in iron 995 ls Desk—has fifteen thousand pieces of inlay 993 nimal life in Australia preserved in museum 928 Diseases hunting wild animals for Uncle Sam 963 pain finder locates cause of stomach ills 921 mument to honor burro 929 smoke seen as cancer cure 912 notor hospital for sick pets 895 tuberculosis soon to vanish 933 A nomy—star equals half million suns 895 Dolls—jointed shapes to form dolls 298 Actomobile Driving—how to keep your car new 949 Electro Therapeutics—folding electric-light bath port- A: tomobile Racing—burning 'em up on the speedways 888 able 969 mobiles—Design—auto with two front ends 948 Eyes—test for auto drivers 992 mobiles—Equipment and Supplies Fingerprints—army can find one man in se million 994 yathtub in motor-bus floor 953 Fire Protection é. seat adjuster on small car 954 alarm rings doorbell when set off by 929 shock absorber and jack combined 924 fire fighting school to save forests ook obiles— Lighting phone on firemen’s helmets aid rescue work 918 ombined spot and trouble light 921 Fish—elevators save lives of sa'mon 944 amps on running boards eliminate glare 942 Fogs—Londor: seeks cure for togs among inventors 894 spotlight on car front turns by lever at steering post 928 Garage—office building with garage 947 mobiles—Repairing—first-aid cars for motor ills. 911 Geology—geolozists serve as scouts in railway deve!- nobiles—Safety Devices opment . 929 ) wis aS autu speeds 912 Glider—launched from plane as target to test guns 988 stop and turn signal controlled at wheel 897 Great War ball—net on ship deck for practice 897 captured v ir stock serves fermers in Argentina 969 aged with plum trees insure rich‘cro»s 913 war camps effaced Ly homes and industrial centers 998 ; Heaters—portable oi! water heare: 920 canary cage with thick walls helps birds learn tuncs 905 Helium—to hep divers and the “sand hog™ 922 clockwork bird iures larks 895 Holders—for paper bags 935 pheasants, farm bred, freed to stock wilds 907 Household Devices 990 and Boating Irrigation—fence rail acts as water pipe 912 at like air mattress run by oars and sail 896 Lead—target range mined for lead 4/0 boat rides on bubbles and is driven by air 997 Lens—three pair of glasses in one 911 boat shown in frame to give interior view 962 Life Saving Apparatus—suit warms body aid has oks—with wooden pages tell history of trees 983 water-tight cap 929 os and Shoes Lightship—school fits sentinels of sea for duty 983 coin runs electric bootblack 982 Loading and Unloading elastic laces for shoes 997 automatic loading scraper 896 sottles self-dumping sacks on trucks 977 ledge on neck makes removal of caps easy 893 Locomotives—engine shaped like bullet 925 _ opener for, worn as ring 982 Logging—sunken log hfter does work of fifteen men 921 sromine—steamer as chemical plant to extract from nar — yee ae grease cup holds sixty days’ ocear 954 pply 998 Building Meaguiivtins Glass—ru'er with magnifying glass used back-mortared brick walls 907 as letter opener 961 new church built about old without stopping serv- Mail Box—trapdoor inside of 948 mn 1ces 925 Mechanical Drawing—magnetic T-square aids drawing 947 Building Materials—gypsum mixed with concrete saves Memorials—tower erected to elephant studded with tame 955 ivory tusks 998 = neras—stand for lofty view 935 Milk—where all the milk goes 936 amping—kitchen in box for auto camp 978 Mines and Mining—cigarets smoked in mines help dis- Chairs cover ore 989 adjustabie schooiroom desk 968 Mirrors—polished metal for 928 hobby-horse chair on springs 943 Models—toy warship run by batteries 977 hicago—huge market to cut food bill 961 Money—what dollars cost to make 914 Cleaning—steam cleaner on wheels keeps signs new 954 Motorships—motorizing the ocean highways 956 Clocks—reminder alarm on timepiece can be set for any Mountain—moves many feet 911 __time 924 Mower—grass trimmer like mower 994 Clothing—why your clothes wear out too soon 937 Musical Instrurnents—new keyboard on accordion 933 [Continued on Page 4] ‘ 7 7 & oe

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[4] [Contents—Continued] N iven better hold by spiral groove 943 Toys Paddle Wheels—fan-tail paddle wheels give more power 935 child’s auto driven by air Paleontolog: ynamite unearths bones five million shake of card changes faces on funny cartoon years old in Mohave 930 Trees—glove leather from trees 9 Paper—newsprint made from straw 924 Turbines—two barrels of oil a minute keep huge tur- Pencils—new points put on by breaking tip 905 bine cool Pens—over six million used in post offices 953 United States Navy—training sailors to shoot ee loose leaf binder cuts holes pe Violins—schoolboy as maker rivals masters umes—fiower scents impair voice ; Volcanoes—severe yt Periscope—guards om seme 906 ar ta volcanic eruptions reduce eet ests Waste Product flypaper rat catchers si 982 a roducts—waste steam in paper mill yields alco exico issues ““grasshopper”’ stamps 918 Waterproof— 1 Petroleum—steam shot into oil wells renews flow 894 See ae mee — eg et for campers by flood 7 Pipes—water mains made on spot 932 Weather—studied in airplane for government report ae AE oor » ave covers large tract = Wire—rope resists unstranding . _— 9) ugs—in battery lights lamp , Ww ; Sudbarecamemelia teeter’ tar dents 984 renches—with socket in head have ratchet handles ¢ Puppets—behind the scenes in a puppet show. .. 899 Radio Aerials AMATE cage foes ayeee, yea Ry space A 4 Sian ae UR MECHANICS vies a wera se 1012 ng Se” le gaa ea aaa i001 Gace —Meree hom cone and seietics 0 like stovepipe sends and receives i oe. ee utomobiles — Lighting — preventing headlights from using loop with a neutrodyne 1012 gy wee R 10% Radio Apparatus—amplifier control switch replaces Py es At en ns af Fe ny ang Ig ™ Raa 2 Application arte or B slipping a i Of phen iene lennctend from trap on warship 913 Bievcl aa 4 ot ee caster Ta calms swarming bees. 906 aos radio control to start and run trains 905 Birds—rustic bird houses. when radio turns doctor. 881 7 and a Radio Battery—battery and charger in one unit 1011 tting the outboard motor for cruising Radio Construction how to make a “straddle bug’ 10 lettering on panels ..... 1011 Built-in-Furniture for the hemno—-Purt VII—bathroom wiring the homemade radio receiver 1006 , cabinet . : ‘ Radio Detectors—adjustable detector r seplaces crystal Clams—digging with a hoe and catwhiskers 1012 Coasters—driving by hand Radio Loud Sp. hers Color Whee!—o!d phonograph used to turn nine feet a SS) © Se 919 Electric Fan—distributes heat 102 novel, of tt ao 1011 Fishing—catching mackerel and blue fish with umbrella sha Te eee ..1001 swivel .. Radio Questions and Answers... ee 6 Cn, Se ot Aggliensse—siots 6 driven in corne: neg mene Grinders—water can for grindstone. pel A a Ear ~~ 3 eee 999 Kitchen Utensilo—three-sided pan for baking ‘cookies t -tube porta ; : ‘ 1003 Rodin bending invisible but deadly rays 985 Laundry—handy tool for washday..... Railroads—“hedgehog” car tells if trains can pass 894 Mucilage—how to apply adhesives... Railroads—United States—50,000,000 meals served in Paper—sanitary drinking cup of, how folded. dinin 962 Phonogtaphs—substitute for diaphragm... Pee “apy ws for safety razor blades ... 988 ee ene ee on letterheads acles—oilcan crate tips in pouring 913 Rubber—proper care of rubber goods Refrigerators—truss rod for ice box keeps doors from safety ac to read the-future . - warping 994 Restaurant—automatic cafe serves food without coins 933 Tags—holder for animal cages, indestructible Road Making Machinery—one-man tractor scoop.... 920 — marker - auto road across the Andes ; 084 for cupboards, cabinets and refrigerators blazing trails for motorists 971 for shingles ——- tell legends 992 in messengers’ vests protect bank valuables 978 Devices and Measures SHOP NOTES loor on car opened by passenger's weight 922 S-bend in street at crossing reduces hazards . 962 Advertising—garden hose shields protect linemen from charged wires 946 Automobiles — Repairing — eee worn spindle warning signs in road center 914 washers ! Safety - — ie -jam movies used to test Bee—geneting. bees f from ants. moto’ 887 eprints—making “Saratoga” :” (Ship) —power of to equal energy of city ad Bridges—portable Sitch en brldge Sawdust—wall covering Calv ective weaner for ’ Saws and Sawing Rigs—portable motor-driven saw 364 Distilling Flask—easily made from light bulb Silver—non-tarnishing . 969 Draftsmen—dial ruler for _.. Smoke Nuisance—man paid to watch chimneys. 935 Drills—how to use twist. Smoker's Stand, etc.—smoker’s kit for auto or table. 953 Ladders—box rest on storeroom. Speed—limit to speed of airplanes seen by doctors 925 Li handling heavy rolls. Sports—latest fads and fancies in water at beaches 926 Merry-Go-Round—novel shoe store Steam Engines—cost cut in haif by high pressure 936 Paints—thinning oil paint with water Street Traffic Regulations Photography—photographing printed matter witho stop sign of rubber .. 996 plates . street traffic signal hand tells time left to cross 989 Pulpe—puiley and gear speeds and sizes = tine ag | America’s newest sugar bowl... . 915 Reamers—high speed, will work in metal v Suitcase—on folding wheels........ ‘ 914 Saws and Sawing Rigs—light portable sawhorse ‘+ Sun—to throw out more heat as spots increase. 946 folds up . oa Swains Island South Sea isle to U. S. 914 Sewage Piant—ceerer pipe septic tank for farms ow be for phone receiver leaves hands free 989 Steel—water for hardening steel Tennis—balls that won't leak . 924 Taper Turning Tool—for the toolpost...... Testing—metal worth more than gold used in testing Econ Stn a PRA machine 919 Trees—watering roots of plants Ne rokeas Tornadoes—phone-alarm plan proposed to save lives... 896 | Wood—shellac over sap and knots............. at DADYDIITAYD AUABOWaANT CS.

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earth's is alco oods Pports idles ies 102 Ss from ir 1 s from nv" ibrella corne fads ‘ s- vT Popular Mechanics Magazine REGISTERED IN U. S. PATENT OFFICE $3 JUNE, 1925 No. 6 WRITTEN SO YOU CAN UNDERSTAND IT Public-Health Service Ambulances, Summoned by Radio, Meet Incoming Ships to Take Off Sick Seamen Who Need Hospital Care ROUND a table in the offices of Marine hospital No. 70, down by the waterfront in New York city, a half dozen ctors sit. They are diagnosing the case a patient who may die within a few hours unless they solve his symptoms and provide the proper treatment. Yet they ve not seen \eir patient h oO is O600 miles or so away in the k bay of an ocean freighter. With all his ymptoms and complaints he represented the medical mnference by a mall sheet of hite paper ying on the ‘onference table—a radio lessage from only that to go by, the half dozen doctors —commissioned officers of the United States public health service—analyze the case and send directions winging back through the air to the ship more than half a thousand miles away. In the usual course, a few days later, a laconic mes- sage, “Patient well; thanks,” and the skip- per’s signature will come back. Last year, the following mes- sage ticked in from the freighter “Casey,” some- where on the Atlantic ocean. “Request co n- sultation as to advisability of extraction of infected tooth. Maranzes.” i¢ captain of is ship. With —_—- ss eaeree i. Sh Public-Health Physician Boarding a Ship via the Jacob's Ladder at Quarantine _eae 7s A sailor had the toothache, and 8381 rTwrsatpearTT ee oOogd

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882 POPULAR MECHANICS Radio Officer on the ‘Leviathan,’ Service to Many Ships Captain Maranzes had a pair of forceps. In the old days he would have used them and the sailor would have suffered the consequences, if any. But with the radio available, the captain called in profes- sional assistance and after the exchange of several messages regarding symptoms, the following advice was sent through the air. “Do not extract. Apply continuous hot compresses to cheek. Give five grains as- pirin every four hours. Give patient a dose of salts immediately. Wash out mouth every hour with alkaline antiseptic. If no alkaline antiseptic, use a teaspoonful of salt to a glass of warm water. Take tem- perature and pulse every four hours. Keep us informed of condition.” “Patient shows signs of tetanus, lock- jaw; blood discharge very light color; one-quarter grain of morphine no effect,” was the next message from the ship. “Continue treatment previously recom- mended. Have patience,’ was the reas- suring reply. The captain did, and the fol- lowing day closed the case with a brief message saying: “Patient greatly improved. services rendered.” Once the U. S. liner “America” picked up a stray message from a lone freighter stating that nineteen members of its crew were suffering from a painful malady. Only the vaguest details were forthcom- ing, as would be expected from laymen. The vessels at the time were some 300 miles apart—obviously a case of long-range di- agnosis. Putting their heads together and working on the meager details, Drs. C. F. Thanks for 884 POPULAR Which Has Given Wireless Medical Leidy and Hislop di nosed the ailment as pt maine poisoning. | two days the men of freighter were treated radio instruction. T} this message came bh to the “America”: “Y; directions followed. but. six now on dut Chey are recovering { Thanks and God ble you. Bon voyage.” At another time other freighter called the “America,” stati: that a member of its cre was in dreadful ago: The. doctor then aboar the “America” studie the case by means of t! scant data supplied, a: The following day a me sage was received fro an Italian steamer some 300 miles aw in an entirely different direction sayin “Many thanks to S. S. ‘America.’ We h sick member of crew suffering from sin lar ailment. Prescribed same as direct: for other steamer. Our patient recov ing. God bless you.” So, what was tended for a specific case also came handy for another. In this particular i stance the radio medical service of “America” had been truly broadcast. More than one operation has been pe formed successfully by a ship’s crew, wor! ing under the direction of a surgeon mai miles away. In some instances the sur: cal instruments have been of an impr: vised nature—kitchen knives, always quite in keeping with the lay han: that wielded them. Surgical cases, su as acute appendicitis, must be caught the nick of time lest they prove fatal. their incipiency, lay methods will wo greater wonders than the efforts of t foremost surgeons when the case has a: vanced to the fatal stage. Hence rad operations have been the means of savi! many a life which would otherwise ha had to be forfeited for lack of early surg cal care. To aid the radio work, a standardiz medicine kit has been developed, and leg lation is being sought to compel eve: American merchant ship which does carry a physician to provide one of t standard outfits. By having the sar medicines and instruments on every shi the radio treatment of cases will be great MECHANICS then prescribed by radi ordinat scissors, pieces of wood, and so on—bu' —— = tel a

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POPULAR MECHANICS 883 Office Ashore, Where Hospital Messages Are Handled, and, Right, the Ship’s Aerials plified, since the doctors can fit the itment to the medicines and instru- s which they will know the ship's ptain has. \Merchant-marine officers also are being juired to take short courses in simple t-aid treatment, and are learning some- ng of medical terminology. One ship’s ptain, advised by wireless to give a pa- tient a “tepid sponge,” radioed back and nted to know what that was. In reply e doctors translated it into a “lukewarm th,” and ever since the word “lukewarm” is replaced “tepid” in treating radio cases. lhe radio medical service had its begin- ng four years ago in an idea of Captain untington’s, chief of the medical and rst-aid course for seamen at the seamen’s urch institute, New York city. The serv- e expanded rapidly and soon enlisted the ive aid of the public health service and e Radio corporation of America. Wire- ess doctoring and the treatment of sailors shore is only a small part of the work of e public health service. It handles the inspection of sailors and passengers at quarantine, the examination of immigrants at Ellis island and fumigation of ships, and is the agency which guards against inter- state spread of epidemics. WDA YDrrTyawp?y VrDrnerrTraArTrmea oor

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884 © Henry Miller ‘ When His Car Is Out of “Fuel,” This Young Driver Charges the Compressed- Air Tank with a Foot Pump and Drives On CHILD’S AUTO IS DRIVEN BY AIR AT FIVE MILES AN HOUR Driven by a compressed-air cylinder that may be recharged with a bicycle foot pump, a motor car for children develops a speed of five miles an hour and will run a quarter of a mile on one “filling.” Steer- ing wheel, windshield, running board, brake levers, and other parts, are modeled closely after those of a real motor vehicle, and the body is built on roadster lines of a late pattern. The car is the work of a British inventor. SCHOOLBOY AS VIOLIN MAKER RIVALS FAMOUS MASTERS Knowledge in woodworking that he gained in the high-school shops has been turned to good account by Edward Davis, seventeen years old, of Wash- ington, D. C., who has fashioned four instruments, two of which he has sold for $1,000 each. He started his enter- prise as the result of a schoolmate’s challenge that he could not make a fid- dle that would play. Undiscouraged by the fact that some of the unusual tools required in making the seventy- three different parts and pieces of a violin could not be ob- tained in Washington, the boy made the imple- ments he needed. Among these was a plane half an inch long with a blade less than a quarter of an inch wide. The backs of the instruments are made from Tyrolean maple and 8S6 POPULAR MECHANICS the fronts from spruce. Scooping out frail bellies required great skill with d cate instruments. Davis is said to be youngest violin maker in the Un States, and musicians who have tes: his instruments declare that they fully comparable w it those made by expert DECAY KILLS MORE WOOD THAN FIRE Decay of wood in United States causes annual loss equivalent t 3,696,137,000 cubic feet standing timber, or 165 per cent of the tot quantity removed fr the nation’s forests e year, according to Reginald H. Colley of t bureau of plant industry. Fungi; atta ing ties, poles, pulpwood and other fo: products and rotting millions of feet standing timber, are the most import agents of destruction, not excepting fir: floods, and insects, he declares. Bet methods of preservation, he belie would save 1,726,774,000 cubic feet of t ber yearly, or about thirty per cent of t new wood grown each year, so that, stopping all preventable decay, the sa: result would be attained as by increas the present new fore areas thirty per cent an ally. Rot, it is estimat: claims 782,145,000 cul feet of fuel, pulp, tanni distillation and ex: sior woods, and 2.9! 992,000 cubic feet lumber, ties, mit timbers, fence po furniture wood, a: the like. ©) National Young Davis in His Workshop, a Sample of a Finished Violin and Anoth in Process of Construction POPULAR MECHANICS

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POPULAR MECHANICS 885 WEATHER STUDIED IN AIRPLANE FOR GOVERNMENT REPORTS \t the naval air station near Washing- observers circle at high altitudes in a cially equipped two-seater airplane to ther temperature and humidity records. ey co-operate with the weather bureau their reports. A conspicuous feature ot the ship's apparatus is a large thermom- eter attached to one of the struts near e pilot. It will register a temperature f sixty degrees below zero. CROSS-WORD PUZZLE INDICATOR GUIDES FANS TO ANSWERS \s a guide toward solutions for cross- rd puzzles, an indicator with a series of ovable alphabets can be used to aid the nin forming proper letter arrangements betore they are written in the squares. By making up test words on the device, various combinations it letters can be tried out, sav- Weather Scouts of the Skies About to Take Off for a C!oud- land Journey to Gather Tempera- ture and Moisture Records MINER FIGHTS WITH CANNIBALS WHILE SEEKING GOLD That adventure still lives in the South seas and that cannibals still are active in spite of the advance of civilization, is shown by reports of a battle a miner had not long ago with the “jungle devils” while seeking gold in the interior of New Guinea. Ignoring the advice of older residents, he had pushed far into the wil- derness with only a few friendly natives. As the party was stumbling through the dense undergrowth at midday, the black leader screamed and went down with a spear thrown from ambush in his breast. His companions fled, leaving the white man to fight the unseen foe with his rifle. For more than ten hours, he battled the cannibals who re- mained hidden be- hind thick foliage. Darts from their blowguns and spears wounded ~ erasures and changes on the uzzle chart. The ndicator, which him in the nose, back and leg. He was finally rescued in be carried in e pocket, does not equire a pencil for marking and its by other white men who had learned of his danger from the fleeing natives. A few weeks before, onstruction per- the savages had at- t sas ready opera- mas a small add- Cross-Word ‘Finder’ by Which Letter Groups May Be tacked a small vil- lage, capturing a g machine. Tried before Marking on Puzzle number of victims. POPULAR MECHANICS 887

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886 POPULAR MECHANICS a Stee 5 ~ ~~” nes " ‘ a Chee Left, Comparison be- tween the Size of Work- men and One of the Craft’s Eight 22,000 Horsepower Electri« Propelling Motors Drawing Above Shows the Low but Graceful Lines the “Saratoga” Will Present in Service, Despite Its Huge Weight and Length Hangar Deck of the Airplane Carrier Where Idle Flying Machines Will Be Stored; Elevators Will Convey Them Up to the Launching Deck Which Forms the Ceiling 888 POPULAR MECHANICS

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o™ | POPULAR MECHANICS 887 OWER OF AIRPLANE CARRIER TO EQUAL ENERGY OF CITY ‘ropelled by giant electric engines gen- ting a volume of power surpassing the ergy of a city of almost 2,000,000 able- lied men working con- 1ously, the naval air- ne carrier “Saratoga,” vy under construction, ll be supplied with 30,000 horsepower to erate its vast equip- ent. Over its top will a flying deck, 888 feet ng and 105 feet wide, vering the craft from m to stern, and form- the world’s largest iting aviation field. o huge elevators be- een decks will carry machines from the rage space below to e landing platform ere they can “hop off” easily as on a ground *k. Seventy-two air- nes will be “mothered” the monster sea-going ngar, which will be ipable of a spe ed of bout forty miles an ur. To defend its car- » during combat, the ssel will carry a heavy quipment of high-pow- red guns. The main bat- tery will consist of eight ght-inch rifles in four turrets built on an “island” on the starboard side, where mast, up- takes and superstructures will be placed to leave the flying deck free from obstruction. For the repair and upkeep of its quota of air- craft, the ship will be provided with ample facilities for performing practically every mechanical service and supplying all re- placement parts necessary to the most up- to-date hangar. Hoistmg apparatus will be available to take aboard and launch seaplanes not fitted for deck landing, and in capacious chambers below decks, tons of high-explosive bombs will be carried. Half of the aircraft will be made up of machines of heavy-duty, types, but the “swarm” will include fighting, bombing, torpedo, scouting, and observation planes. Put to commercial use, the electric power could supply the city of Boston with all the ‘urrent required for light, heat and power. TRAFFIC-JAM MOVIES USED TO TEST MOTORMEN As a final test for the fitness of appren- tice trolley motormen to successfully op- erate through busy thoroughfares, a Movies of Congested Street Traffic Employed with an Imitation Street-Car Cab to Test Skill of Apprentice Motormen When Facing Emergencies street-car system in France places the be- ginners on a platform, equipped to repre- sent a car cab, facing a motion-picture screen on which reproductions of traffic are thrown. The reels are made from the front of a moving car while passing through crowded districts and include sit- uations of risk that demand skill in the operation of a vehicle to be safely avoided. When the motorman takes his position in the imitation cab, the scene is stationary, but as he moves the controller to start, the film is set in motion. As the traffic conditions on the reels are mainly such as are met with in everyday running, the .student is called upon to slow up, stop and apply the brakes in emergencies to demonstrate his alertness and ability. POPULAR MECHANICS 889

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888 POPULAR MECHANICS

Burning "Em Up on the Speedways Testing Ground for Motor Ideas Shows What Next Year’s Pleasure Car Will Feature and What It Will Discard HE 122-cubic-inch racing car, weigh- ing all of 1400 pounds, and with an engine one-third smaller than that of a Ford, will make its farewell tour of Amer- ican racing tracks this year, preparatory to being discarded for something even smaller. Next last year, will feature superchargers. The first pleasure car with a supercharger wil not be on the market before late this year or early next. Only the highest-priced cars will have it at first, but if the price of gasoline goes up, the cheaper cars wil! come around t<

year’s racers, with a cylinder capacity of 91.5 cubic inches, will turn a new page in the history of automobile de- velopment. When you divide a total cylinder capacity of 91.5 cubic inches among eight racing cylinders, the re- sulting bore is so small that it is not much larger than the diameter of the crankshaft. As usual the race track, laboratory of the pleasure car, is several years ahead of commercial auto- mobile develop- ment. This year’s

supercharging ir time. Practically every major ad- vance in pleasure automobiles, with the sole outstand- ing exception o|! the balloon tire, is a development of the race track Build them and break them up, then rebuild them until they won't break, that has been the rule with the racing designers until the possibili- ties of any given size have been ex- hausted. Then they

racers, like those of 890 Fred E. Duesenberg start work on an- other size. It is a far cry trom the 600-cubic-inch class, POPULAR MECHANICS

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— i ~ POPULAR MECHANICS 889 -- ¥ Assembling the Rac- | ing Car at a Speed- = way Garage Ready | for a Grueling | Long-Distance Race | =—>~ — ————————y J _ = = a 3 7 + . A i . 4 : ff” A — . ' | ¢) ¢) BItY YVw _ . a | Ph ae oS | RADEON a 7 | ‘ ha é = se wT s N® > y su, eS Yh te é A With Tools Laid Out and Sup- my plies Ready, the Pit Crews Are Prepared for the Start of a 500- Mile Grind ee ___— wn TTI NS. ST POPTITAR MEFCHTANTCS e014

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890 Drivers Lose Track of Time and Distance, So the Pit Crew Keeps Them Posted with Lap Numbers, Their Posi- tion, and Advice Now and Then about the Po- sition of Rival Drivers, or Obstructions from Accidents on the Course raced back in 1911 at the first Indianapolis 500-mile race, to the 122-cubic-inch single- seaters of this year, or the 91.5 one-pas- senger racers of next. Ray Harroun won that first Indianapolis classic in a big six-cylinder Marmon of 447.1 cubic inches’ displacement, while Ralph DePalma, who came in sixth, piloted a Simplex with a 597.2-cubic-inch motor. Stripped for rac- ing, his machine weighed 2,700 pounds, and in a pinch his motor would turn up to 2,000 revolutions per minute. The Duesenberg which Joe Boyer drove to victory at Indianapolis last year weighed 1,400 pounds, had eight cyl- inders, a displacement of only 122 cubic inches, and the racing speed for his en- gine was around 5,000 revolutions per min- ute, with an even higher rate possible for short spurts. Harroun’s winning speed in 1911 was 74.59 miles an hour. Boyer drove the 500 miles at an average of 98.24 miles an hour. Since that 1911 race, American and European builders have fought year after yeac for supremacy in design, and their developments, reached independently, have frequently arrived on both sides of the ocean at the same time. When Fred Duesenberg introduced the first eight-in- POPULAR MECHANICS line American racers at Indianapolis, in May 1920, three foreign cars were present with eight-in-a-row engines. A V-type eight, the year before, and DePalma’s twin six, in the same season, had been the only cars to pass the six-cylinder size. Two years after Duesenberg and the foreign designers introduced the eight, the old four-cylinder racer had _ practically disappeared. Out of the first ten cars fin- ishing in 1922, nine were eights and one was a four, and it got ninth place. Three names stand out in American motor development since the first of the Indianapolis races — Duesenberg, Harry Miller and Louis Chevrolet. Miller has worked alone, while both the others have been assisted by their brothers. Duesenberg’s first eight-straight engine is a story of motor-car development in itself. The motor owes its birth to the fact that the racing-car builder had been ordered to Florida by his doctor in the winter of 1918. Having nothing else to do but be sick, he set to work in bed and developed the engine, had the patterns made and parts cast, and sent for the late Jimmy Murphy and George Dennis to take charge of the con- struction. The drawings were not completed until February, and two of the motors were racing at Indi- anapolis on May 30. He was the first to develop a supercharger for an American racing car, and worked out the THE GROWTH OF SPEED "| BE following table shows the progressive development of rac- ing cars in the Indianapolis races, with the constant lowering of sizes, increase in cylinders, and increase in average speed of the winner: 600-CUBIC-INCH CLASS No of Cubic Av g. Year Cyl. Inches Speed 1911 6 447.1 74.59 1912 4 490.8 78.70 450-CUBIC-INCH CLASS 1913 4 448.13 76.92 1914 4 380.2 82 47 300-CUBIC-INCH CLASS 1915 4 274 89.84 1916 4 274 83.26 1919 4 274.6 88.06 183-CUBIC-INCH CLASS 1920 4 182.5 88.50 1921 8 182.5 89.62 1922 8 181.44 94.48 122-CUBIC-INCH CLASS 1923 8 122 90.95 924 8 122 98.24 POPULAR MECHANICS

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- ‘ POPULAR MECHANICS 891 (= — a — " 30 = \ we Hurried Repairs un- der Way at Pit to Put Car Back in Race, Y While a Rival's Up —~ Manager in Next (Pr. ™ Stall Holds Up the ail aa (b Yor \) Hundred-Lap Sign Getting Up Speed on the Steeply Banked Turns of a Wooden-Floored Racing Bowl in Southern Cali- fornia POPULAR MECHANICS R92

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892 idea at church on a Sunday morning while listening to the organ play. The super- charger, Duesenberg says, is the biggest forthcoming improvement in the pleasure car. Before it is perfected, however, it will be necessary to produce a dependable source of power, with a steady speed, to turn the blower. The supercharger is designed to main tain engine compression when the intake ports are opening and closing in minute fractions of a second, with the engine run- ning, as in a racing car, at 5,000 revolu- tions per minute, or more. An engine with a compression ratio of six to one will give a gauge compression reading, say, of 95; but at 5,000 revolutions, this would drop to 68. The supercharger forces the mixture in under a pressure of about two and one-half atmospheres, just enough to keep the compression reading up to 95. It is nothing but a revolving turbo-wheel, which turns at speed that the gasoline fed apart into atoms. Duesenberg is one of those accidents of the automobile field who rode into it mounted on a bicycle. Holder for four- cone-shaped such terrific into it flies teen years of the world’s record for the unpaced two and three-mile distances on two wheels, he became interested in gaso- line engines through the desire to have a motorcycle to pace him in exhibition races. No motorcycle made in those days could compete with “Dusey’s” legs, so he set to Tommy Milton Driving Sixteen-Cylinder Duesenberg at Daytona Beach the Day He Made 156 Miles an Hour, and, at Right, Electrical Timer Clocking Him work and built himself a gasoline engine and mounted it on a bicycle. He campaigned some of the earliest auto racers in the old stock-car days, finally ending up in a bad smash which left his shoulders too badly crippled ever to pilot a racer again. Then he turned to design- ing; and, with his brother August, began producing special racing jobs, and started his career as one of the best-known auto- mobile designers in the world. Six-hundred-cubic-inch classes were POPULAR MECHANICS common in those days, while practically nothing was raced under the 450-cubic- inch size, but the Duesenbergs started off with three little 220-cubic-inch machines and won a number of races. Next the turned to 350-cubic-inch four-cylinde: racers, and cleaned up the 450-inch class The cylinders were cast separately, so the provided an extra set of cylinders and pis- tons and overnight could turn the 350- inch cars into 300-inch motors. One day they would race in one class and the next day be out again in the other. Racing cars so far below the standard classes of the day permitted them to do much of the pioneer work which led to the steady lowering of car sizes until the present 122-inch class was reached—and it is now going by the board for something still smaller, though as an official class it is but three years old. When Carl Fisher, head of the Indianapolis speedway, an- nounced, after the 1919 race, that the 300- inch machines would be dropped, he gave as his reason that they were entirely too fast for the famous brick oval, built as a testing laboratory and not as a speed track. The winning speed that year was 88.06 miles an hour. Last year, with 122-inch cars, the winning speed was 98.24, and the cars were sater than the 300-inch class. That increase of 10.18 miles an hour in five years is a tribute largely to the work of Duesenberg in developing the eight- cylinder car, four-wheel brakes and the supercharger. POPULAR MECHANICS

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POPULAR MECHANICS 893 . - a 4 = ' y 7A | es in | Battleship ““Arkansas’’ with Its Network of Radio Antenne and Lead-Ins Strung between Masts; the Cage Type Predominates Because of Its Greater Efficiency in Small Space CAGE TYPE OF RADIO AERIALS SAVES BATTLESHIP SPACE Radio antenne of the cage or “sausage” pe are more widely used on our battle- ps than other kinds, because they save pace and generally have been found more ethcient. A single ship may have several ransmitting sets, evidenced by a network { aerial wires and lead-ins rigged between e masts. One antenna, usually the high- st, is devoted exclusively to sending offi- cial code. The others are used for vessel- to-vessel communication. LEATHER KEPT FOR TEN YEARS That leather of good quality kept for ten years, under ordinary conditions does not lose more than fifteen per cent of its trength, was shown by experiments of he bureau of standards. Belting stored in he laboratory for a decade was found to be only slightly weaker than new material ot the same grade, indicating that articles made from it would be preserved for an ndefinite period if subjected to normal at- mosphere, ventilation and light, while lampness and sunlight appear to have a harmful effect on the leather. it is be- lieved the results of the studies will enable manufacturers of shoes, luggage and simi lar goods to alter shipping and storage practices, since such articles may be ca- pable of many years of service even though they might not reach the user un- til one to three years after they are made. LEDGE ON BOTTLE NECK MAKES REMOVAL OF CAPS EASY Metal caps can be pried off with a coin, knife blade or other flat article on a bottle that has a ledge around the neck ’ just below the locking rim to af- ford leverage. The operation does not mutilate the top; hence it can be used again, and the danger of chipping the glass is eliminated, as is also the trouble of hunting for a bottle opener. POPULAR MECHANICS 895

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894 POPULAR STEAM SHOT INTO OIL WELLS TO RENEW FLOW Steam, heated to 1,100 degrees Fahren- heit and injected at 1,000 pounds’ pres- sure, is being used successfully to renew the flow in oil wells that become clogged by the congealing of the salt and paraffin content. The method produces somewhat the same results as exploding nitroglyc- erine, but is said to be more effective as it does not drive the paraffin back into the sand, but dissolves it so that it can be drawn off. With the equipment invented by a Colorado man, this process now can be applied without removing the pumps. Steam generated in a special boiler is in- jected through a three-quarter-inch pipe, incased in an outer one two inches in diameter, to insulate it from surrounding oil. It raises the temperature at the bot- tom of the well to 240 degrees. Continued for eight or ten hours, this boil- ing-out treatment is said to entirely remove the accu- mulated paraffin. Tests made at a depth of 2,200 feet, resulted, according to reports, in an in- creased flow of eighty- five per cent. MECHANICS can be arranged to represent the exact height of the rolling stock and are con nected to signal bells inside the car. to warn the inspectors when an obstacle is struck. LONDON SEEKS CURE FOR FOGS AMONG WORLD’S INVENTORS In an attempt to combat the deadly fogs which regularly envelop the city during the winter months, the London county council is seeking a means of dispelling the’ heavy ( the mists, among scientists and invent- ~ } \| ly Wt / ors of the world. Many extermina- — tors have been tried, but none has resulted in any great degree of success. One method tested consisted of suc- tion fans at- tached to conden- ser boxes, which drew in the murky mist, and by means of heat, turned it into nor- Tunnel-Testing Car with Rows of Spikes to Touch Obstructions, and Measuring One of the Prongs Which Are Wired to Bells “HEDGEHOG” CAR USED TO TELL IF TRAINS CAN PASS TUNNELS Sets of adjustable spikes have been at- tached to the roof of a car on an English railroad to determine if new equipment can pass safely through tunnels and under bridges, or signal boxes and other objects along the right of way. The projections 896 mal air and per- mitted it to dass off, leaving the dirt particles in a receptacle. The appa- ratus was capable of “reducing” several hundred cubic feet of fog a minute, but even a light formation would require about 750 of the machines, on streets, roofs and poles throughout the city. The cost of such an installation, it is claimed, would amount to $25,000,000, and much more in the case of denser. fogs. POPULAR MECHANICS

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BS “<t JS In SF

POPULAR MECHANICS 895 STAR EQUALS HALF MILLION SUNS Equaling the radiation 600,000 stars as bright the sun, the S. Dora- believed to be the st’ luminous star own, loses two and a f trillion tons of its ss a second, by its ac- n of producing light, ording to Prof. Har- Shapley, of the Har- rd College observatory. e diameter of this int of the skies is much reater than that of the rth’s orbit, which is bout 186,000,000 miles in ength. The huge lumi- ous body is classed with e stars known as vari- bles, owing to their hanging periods of max- mum brillianey. The re- ort states it has been growing brighter for the past twenty years. CLOCKWORK BIRD LURES LARKS Skylarks in France are being killed in such great numbers by the use of a ooden “insect” placed the end of a pole hat efforts are being made to stop the sale of the device. The lure has two wings which revolve rapidly by means of a clock- work, and there are small mirrors to catch he sunlight. The birds, attracted by the glitter, fly down and are shot by a hunter ho conceals himself behind bushes. Courtesy The Sphere

Run by Clockwork, the Mirror-Studded Wings Whirl in the Sunlight to Lure Larks

Veterinarian Administering Medical and Surgical Aid to Animal Pets of Lon- don’s Poor Quarter, in a Motorized Hospital That Renders Free Service MOTOR HOSPITAL FOR SICK PETS TREATS ANIMALS ON STREET Skilled treatment for sick and disabled animals is dispensed by veterinary su geons who tour the poorer quarters of London with a miniature hospital in- stalled in a motor truck. Dogs, cats, chickens, horses and practically every other kind of pet are brought by owners to the motor dispensary for first-aid and medical attention. The veterinarians are fully equipped to perform almost any service for the ailing animals, and afte attending to their needs, give valuable advice to the owners regarding the care of the pets in health as well as in illness. In six weeks of work in one large district, more than 1,600 cases were treated during the evenings. The automobile hospital was established to reduce disease and dis ability among animals of those who can not afford to pay for attention to them POPULAR MECHANICS 897

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896 BOAT LIKE AIR MATTRESS RUN BY OARS AND SAIL Using a collapsible hull of waterproof fabric, which is pumped up like a tire, a new boat recently exhibited at the third annual hunting show in Berlin, Germany, provides a novel form of navigation in shallow and reed-grown lakes. The craft has an inflated sausage-shaped rim, with a fabric bottom. Outriggers on either side assist in bracing the short mast, to which is bent a leg-of-mutton sail. Steer- ing is done with a short oar slipped through a metal holder at the stern, and when wind is lacking, the mast may be taken down and oars shipped in oarlocks on either side. Because of its extremely light weight and ability to support a heavy burden with light draft, the boat is ex- pected to be especially useful in the duck marshes. With the sail lowered and mast unstepped, the shape of the hull is such that it can be built into a duck blind with ease. The craft is said to be practically non-collapsible. Dragged ashore at night, its air-inflated skin would be available as a mattress for the occupants, while, when deflated, it is easily transported. Though stanch enough to withstand moderately rough weather, the boat is, of course, prin- cipally designed for use in the quieter waters of rivers, lakes and inlets. POPULAR MECHANICS TORNADO PHONE-ALARM PLAN PROPOSED TO SAVE LIVES A telephone-alarm system to warn per- sons of the approach of tornadoes ha been suggested by Dr. W. J. Humphrey of the weather bureau. There is no certai way of foretelling their coming, he say but when they strike, word could be tele- phoned ahead in time to save lives, it is believed, as the storms, contrary to popu- lar belief, average only about thirty miles an hour and move in a relatively straight path. They generally do not damage a: area wider than a quarter of a mile. As shown by the disastrous storm that swept southern Illinois, Indiana and Missouri last March, great damage and loss of life may result when they strike populous centers, but statistics prove that a single house is more likely to be destroyed by) fire or lightning. than by tornadoes even in districts where these severe winds are common. Several years ago, the weather bureau made an effort to forecast tor- nadoes, but the warnings were uncertain and spread so much fear that the plan was aban- doned. Scientists believe that airplanes can be used in studying these storms, as the machines can circle around them, enabling photographers to take pictures, furnishing data that would be of great value. soncinantiantitscitnieamidl Air-Filled, Collapsible Boat for the Use of Sportsmen in Navigating Shallow Waters, Which Cannot Upset and Is Propelled by Either Sail or Oars 898 POPULAR MECHANICS ' ; ' ' '

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iu n- 1g Tee ee ee ~ ee POPULAR MECHANICS fl meg = OOOO! Abi pot Ay | : eS » = ie A EEF RG gle pia 897 Battery Practice inside Cage of —s on Deck of the “‘Mississippi’’ Gives Players an Early Start toward a Championship BASEBALL NET ON SHIP DECK PERMITS PRACTICE AT SEA Sailors on the U. S. S. “Mississippi” get heir early baseball practice while at sea rigging a large net on the deck, and, on the improvised “diamond” within, have ly workouts at pitching, catching and itting. The cage has a roof of meshing » keep wild balls from going over the »p and is large enough to accommodate eral men at one time. } AUTO STOP AND TURN SIGNAL IS CONTROLLED AT WHEEL \ttachable to the front or rear of the r and controlled by buttons on the steer- wheel, an electric traffic signal that licates stops and turns by a combina- tion of lights, a pointing hand and a ud bell, has been patented. It is pat- terned after the semaphore system in use railroads and is operated by a small eectric motor. To signify a stop, the inter is swung back and forth three times. At night, this causes a red light move like that of a switchman’s lantern siving the universal signal for a halt. urns are signaled by pointing the arm to POHOPTITITAR eam When the Spring Training Season Opens the side the car is to take. Each sign is accompanied by a gong which rings auto- matically, and a red flag with a white pointer hand is an additional aid in the daytime. A neutral or safety position is indicated when the pointer is vertical and a green light is showing at the center. The device is independent of the brakes. Rear Signal at Left-Turn Position with Dotted Lines Indicating Neutral and Right MWIRCT ANTICS eo0

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898 POPULAR MECHANICS AUTOMATIC-LOADING SCRAPER SINKING OF LOFTY DOME TO BE SAVES TIME AND EXPENSE For all kinds of slip scraper work where material is to be hauled, an automatic STOPPED BY DEEP CAISSONS The “flow” of foundation soil resp sible for the sinking of the huge gol: dome adorning the st

capitol building of Sou Dakota is to be stop; with caissons which y pierce the earth for twenty-seven feet. In addition, the _ footings that support the stru ture on which the dome rests, are to be encircled by retaining walls sheet-steel piling, one- half inch thick. ‘The soil slides have caused the dome to dropthree inches since the edifice was erected fifteen years ago Though the structure

With This Rig, the Team Dumps the Scraper Load and Empties It into the Truck in One Continuous Operation loader has been devised that is operated by the same team of horses that does the excavating without unhitching or stopping them. It consists of a hopper attached toa geared arm, both fixed to a flat base placed in position by the side of the truck. After the scraper is dumped into the conveyor, it passes onto a track where it engages a hook, and as the horses proceed, the load is lifted and emptied into the wagon. An automatic spring permits the hopper to return to the ground for another filling without too much force, and the scraper is released from the hook as soon as it reaches the end of the track. This ar- rangement, it is claimed, makes a bridge or tunnel trap unnecessary, saves the use of extra teams and men, and because the operation is continuous, there is a marked saving in time. The equipment has a lifting capacity of 2,000 pounds. &)

4a “a s > ¥ 4 DM 223 < fy wer cannot be lifted back in to place, it is claimed t anchoring of the so which undergoes a slow but steady shii' ing, will halt the downward movement of the building’s roof and cupola. JOINTED SHAPES TO FORM DOLLS TEACH AND AMUSE CHILDREN Character dolls, toy animals and midget figures of a wide variety can be made | children with sets of jointed frames at- tached to small supports to hold them up right. Only the bodies, arms and legs ar represented in the flexible skeletons; t! heads, hands and other parts are to supplied with paper cut-outs and attach: with little clamps provided for that pu: pose. The joints permit many different postures and by suiting the face and a ditional equipment to the character th« wish to depict, children gain instructi: and learn to draw on their imaginatio:

Samples of Character Dolls and Postures Obtained with Frames; They Have a Broad Base and the Universal Joints Can Be Bent Dozens of Ways for Variety aA WWMM WITT AWD ACE OCOUTFT ARTI OOS

“ w,

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POPULAR MECHANICS 899 P 'PPETS, so marvelously constructed ty-four-inch dolls, with movable legs and it the little two-foot-high dolls con- arms, tongue and eyes, and even chests the illusion of full-grown people as that rise and fall in simulated breathing. strut across the stage, fight, make They are so complicated in construction dance, sing and talk, have revived that some have as many as twenty-six of the world’s oldest forms of en- separate control strings, while few have inment. less than twenty-two. The strings are of Ya great many years the marionette strong black thread, invisible to the audi- had fallen to such low estate in ence. To handle so many separate strings, erica that an occasional Punch and Sarg designed a controller, a device con- pair for amusing the children was __ sisting of crossed pieces of wood with sole survivor. Then a New York art- strings attached at the ends of the various id illustrator, Tony Sarg, captivated = sticks. The original controller, a four e grotesque charm and string type, was two straight » of some puppets he ] in London, revived the t dead art and, by ap- ng modern methods, ight it to a higher state when it flourished in ent Greece and Rome, later still in China, in and Siam. The old- e puppets were either nipulated by the thumbs | fingers of the operator, ng thrust up from below e stage level, or else were the style of those still used pieces of wood joined in the center to form a cross. Wrist strings were attached to either end of one cross arm and the knee strings to the ends of the other. By rocking the controller, al ternately lifting and lower- ing the ends, it was possible to make the puppet’s legs alternately rise and fall, to produce a walk, or to raise | and lower the hands. From iii that simple beginning the | twenty-two string con- italv, heavy ungainly fig- trollers have been developed. es suspended from wires. When Sarg first entered rg s puppets, on the other the puppet -show business nd, are dainty little twen- Tony Sarg he employed and trained a i ee et i, mn am a eee 4 ee @ ae ee nn?

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900 POPULAR MECHANICS Preparing for the Puppet Show by Hanging the Characters for the First Act on Their Hooks and Mountin; the Back Drops and Curtains cast of “puppeteers” to manipulate the strings, and a cast of actors to remain hidden in the wings and speak the lines. The resulting cast was so big the mem- bers were in each other’s way, and the pay roll so great that the show, while an ar- tistic success, was a financial failure. Later he eliminated the speaking actors, and now the same cast pulls the strings and speaks the lines. To bea puppeteer requires careful train- ing. The men and women who work the strings are placed on platiorms above the visible stage. They must be able to handle more than twenty strings without produc- ing any false motions, memorize and speak the proper lines, and, if strings become tangled or some accident momentarily de- lays the action of the play, they must be quick-witted enough to extemporize lines and actiontocovertheaccident. The joints of the dolls are very loose and flexible, and the trunk of the body is cut away and part of an old stocking substituted, so that the puppet can sit down in a normal position, with none of the stiffness of an ordinary doll. The feet of the male dolls are fil with shot to keep the body properly er: and the skirts of female characters, if lor are weighted for a similar purpose. the play calls for short skirts the feet m1 be weighted too. Heads of the marionettes are carefu carved from wood and then painted in t proper colors, while wigs of natural h are fitted. All of the stage settings carefully designed in the right proportio to fit the two-foot characters. The pr cenium arch itself is but six feet above t stage floor. The result of the careful b ancing produced a remarkable and unc pected result. When the first show presented, there were calls for the aut! at the end, and Sarg stepped out onto stage, apparently leading the little lead: lady by the hand. There was an astonis! gasp from the audience, and thena burs! applause. Friends rushed back stageto' him that when he walked on the stage appeared to be twelve to fifteen feet hi and as though he weighed about pounds. The audience had been watch

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POPULAR MECHANICS Sailors Bold and a Ship Suggest a Pirate Play or Deeds of Dar- ing in a Storm on the Howling Main Man) N // _ All Strings to the Woo Controller Putting the Finish- ~ ing Touches on an Actor JS — ——$___— 901

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902 POPULAR MECHANICS Cf - | . e i\ | 4 \ \ | Vay | Two “Puppeteers” Working a Nineteen-String Manikin, One Hold- the one in the chair, makin; good connection. Back stag: operator is watching throug] peephole in the curtain, and ho ing a lighted cigaret in his hat When he sees Veeder’s pipe up to his mouth the operat puffs on his cigaret, and blo through the tube. Wisps smoke emerge from the pipe bo Then Veeder lowers the pipe a smoke curls from his lips. In “The Green Suit,” a fat pu pet, bewitched by Doctor Mas cus, shrinks to alarming thinne and afterward is restored to | original size. Inside the doll i rubber bag, somewhat like t bladder in a football. This is i flated when the puppet is to fat, while a tube running ba stage makes it possible to let t air out when he grows thin, a: blow him up again when it is tir to become fat again. Originall toy balloon was used instead of heavier rubber bag. One day t young woman who was doing t! part and blew the puppet up unt he burst. The actor speaking t ing the Controller and the Other Manipulating the Hand Strings lines cleverly improvised a fe the marionettes so long and were so under the spell of their natural acting, that they had come to accept them as living actors, so that when Sarg appeared, he seemed to be a veritable giant. The illusion was seized on by the artist, and, ever since, his marionette shows have closed with the manager appearing on the stage among the dolls, a trick which never fails to produce gasps of amazement from the audience. Remarkable effects are obtained with the tiny dolls. In the play “Rip Van Winkle,” the audience was mystified when the puppet representing Nick Vedder, the innkeeper, sat down in his comfortable chair, put his pipe in his mouth, took a long puff, and then blew a column of real smoke into the air. The effect was made possible by an ingenious arrangement of rubber tubes. One tube runs from Veed- er’s mouth through his body and emerges in the middle of his back. A second tube runs from back stage up through the floor, and inside one rear leg of Veeder’s chair, emerging just above the seat. The ar- rangement is such that when Veeder sits down, if the puppeteer handling his strings manipulates him into the correct position, the tube in his back slips over lines and covered the situatic One of the most remarkable of the Sa marionettes is porter Gruffanuff in “T! Rose and the Ring,” who is turned into door knocker by a fairy whom he has i sulted, and later brought back to life wh« the fairy relents at the end of the pla The figure of Gruffanuff is fitted with ty complete sets of strings, thirty-six in a one set being manipulated from the ove head platform and the other from ba: stage. The body of the porter is holl and so are his legs. As long as he stand upright he appears like the other dolls, bu when the moment for the transformatio into a door knocker arrives, the back-stag set of strings, which pass through a sma opening in the back-drop door where t! knocker should be, are pulled, and t! body is drawn through the hole, leavi: only the head sticking out as a knocke: Gruffanuff shrieks with pain as his body pulled through the hole. At the close « the play the fairy transforms him back t life, the strings leading to the overhe platform are pulled and the body emerg: ‘again. An amusing bit occurs in “The Thre Wishes,” another of the Sarg plays, whe Margaret wishes for a string of sausag« and an instant later finds them attached t blowing was carried away by he: Se Po oe

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POPULAR MECHANICS 903 Ballet of Mari- onettes in “Puss in Boots,” at a Performance before Italy’s Monarch Two Dignified Characters from the Puppet Stage of Japan —— Huck Finn Live Again in Mark Twain’s Immortal Story 4 e, Copyright, Outdoor Photo Service

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904 the end of her nose! The sausages are hid- den in the pocket of her apron, with a string running from them through her nostril and up to the operator. When the time comes for the sausages to appear he pulls the strings and the sausages fly up and attach themselves, apparently, on the unlucky girl’s nose. Anyone can produce marionette plays at home, Sarg says. His little daughter has her own troupe of puppets, which she made after suggestions furnished by her father. For the home play, Sarg suggests a supply of characters can be made from ordinary rag dolls, purchased at any toy store. The stage can be built up from an old wooden box, with a cardboard pros- cenium arch, and a cardboard background to hide the operator. The stage is mount- ed on a table, and the operators handling the strings stand on the same foundation. Toy furniture provides the stage fittings, and scenery and backgrounds may be painted on cardboard. A window shade with roller makes a good stage curtain, which is very necessary as it must be pulled down quickly if any accident hap- pens to tangle the strings of the charac- ters. Arch and other fittings should be designed in proportion to the size of the ? ee POPULAR MECHANICS dolls. With two-foot puppets he uss six-foot high arch. In using ordinary dolls for puppets, arm and leg joints should be loosened t work freely, the head loosened to turn ¢ ily, and, if possible, the chest of the b should be emptied of stuffing to per the marionette to bend and sit down. | children, he advises only seven string start with, two being fastened to the knees two to the wrists, and two to the ear turn the head, and the seventh to t! middle of the back. The two knee string are fastened to either end of a short wo en bar, to be worked with one hand, the other five led to a cross of two b The ear strings go to either end of t! crosspiece, the two wrist strings to front end of the other strip, and the c from the middle of the back to the rear end of the same strip. A loop of cord tached to the crosspiece slips over hand when the puppet is in use, and serves to hang it on a hook when it is not action. A wooden peg or nail is drive: in the cross at the center, and a hole m in the extra stick attached to the k: strings, so that it can be slipped over peg to free the other hand when this : be found necessary. (no / / ine The March of the Wooden Soldiers with Their Bright Pink Cheeks Expresses the Sly Humor Which Marks any of Tony Sarg’s Marionette Shows

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POPULAR MECHANICS 905 RADIO CONTROL ON RAILWAYS TO START AND RUN TRAINS radio system capable of operating ay trains, throwing switches, and iding means of com- ication with passen- all from a central has been described G. T. Allen, of the estinghouse Electric Manufacturing com- It is entirely pos- he said, through a bination of electric radio supervisory control, to start a train out a crew from a tion, operate it at full eed, or to slow or stop automatically in com- ince with automatic ck signals, permitting ntrol and supervise mpletely all move- ents of trains on a sys- The carrier-current of signaling and mmunication, as the process is called, is hased on the principle that wireless waves | practically follow along the course of res without leaving them, if propelled a certain way. A combination of the itomatic-telephone art and the radio into wireless-telephone system has _ been orked up by C. A. Boddie, of the same concern, and, the speaker said, has oper- ted perfectly for over a year on an ex- ended power system. The carrier-cur- nt system is a method of communication radio which can be operated at any oint along a system of power-transmis- ion wires, similar to those of an electric railway, and the inventor claims it pro- duces greater clar- Whistling and Singing Practice for the Feathered Pupils; Walls ’ of the Cage Boxes Are Insu- central dispatcher to lated to Deaden Noises When the Birds Are Shut Up in Them CANARY CAGE WITH THICK WALL HELPS BIRDS LEARN TUNES Canaries that can whistle “Yankee Doodle” and other simple tunes are being raised by a Cali- fornia woman,and one of her helps in teaching the K, vy ——_. Distracting pets is a soundproof outer cage for each bird. This prevents them from hearing the chirpings of their neighbors and thus confusing other songs with the ones they are being taught. All the cages are.ar- ranged so that the birds can hear phono- graph records used in training them. Canaries that appear to have unusual abil- ity are given special lessons with a piano. NEW POINTS ARE PUT ON PENCIL BY BREAKING TIP OF HOLDER When the point of a self-sharpening pencil designed as an inexpensive time- saver is to be replaced, the used stub of lead can be quickly broken off to expose a new tip fer writ- than is possible ith the ordinary elephone line cov- ering an equal dis- tance. Any switch on such a system ay be thrown without affecting other switches, he tated, and practi- cally any operation in be performed ing. The sections are carried ina notched tube of soft metal and each point is finely ta- pered. As the pieces wear down the filler can be pushed outward and broken off with a slight twist of the fingers. As each | TO BREAK OFF } USED POINT t a distance with- ut wires even hough one of the tations may be in motion. A central op- rator could be informed by the same method of the various performances. Self-Sharpening Pencil on Which Point Is Renewed by Breaking Tip of Holder portion is removed the following one is uncovered in prop- er position for use. Fillers are made to extend the full length of the pencil and are readily inserted in a few seconds.

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906 PERISCOPE GUARDS BANK VAULT FROM BURGLAR RAIDS Valued in the war as the hidden eye that enabled soldiers to look safely out of their trenches, the periscope has been adapted to the purposes of peace as a bank-vault protector. An eastern institu- tion has installed the apparatus in r such a way that a watch- man can keep vigil over the vaults from the sidewalk, without entering the build- ing or giving marauders any clue that he is around. Near the safe is an arrange- ment of mirrors set to re- flect the area surrounding the deposit boxes into a telescopelike tube that leads to a peephole in the outer wall of the bank. A glance into this opening gives the watchman a full view of the vault room. In case intruders are found, he can send in an alarm while remaining on guard. WASTE STEAM IN PAPER MILL YIELDS ALCOHOL AND OIL Turpentine, pine oil and wood alcohol are being collected in large quantities at a southern paper mill from the fumes aris- ing fn the cooking of the pulp. The prod- ucts are expected to yield more than $150,- 000 a year from what has heretofore been considered waste. This saving is in line with similar economies now being prac- ticed at several modern plants. Tree tops POPULAR MECHANICS and limbs, once considered useless, are now sent to the mills and ground into pulp; lath, broom handles and other a: ticles are made from slabs; trimmings and sawdust are used for fuel. Even the pine cones are collected for the seedlings they provide to replant cut-over tracts. RADIO CALMS SWARMING BEES AND AIDS HONEY YIELD By introducing radio among his numer ous hives, a European beekeeper claims he readily pacified the young swarms, en- abling them to be easily removed to their Upper Photo Shows Periscope Peephole on Outer Bank Wall, through Which Watchman Observes Vault Room Reflected by Mirrors Below new homes. Bees, it appears, are pecu liarly susceptible to sounds, especial drumming noises. When these sounds are not produced artificially, a buzzing noise is made by the insects, but the energy thu expended excites them. To avoid this, the radio loud speaker is placed near the hives with the result that its sounds attract the bees’ attention and seem to pacify them while they are settling in their new homes In this way no time is lost in setting the hive in order and gathering honey for the combs. @ Whenever you find that you wish to know more about any article in the maga zine, write our Bureau of Information.

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POPULAR MECHANICS 907 FARM-BRED PHEASANTS FREED rO STOCK WILDS OF STATE ry year the state of Oregon hatches ets free from its two game farms than 10,000 Mongolian pheasants. birds, bred purposely to stock the ng grounds of the state, are shipped e localities in groups of from twelve rty-six pairs. Once freed, in a short they become as wild as those reared » open country and seem to thrive in limate of the region. The first of : pheasants were imported forty years ind have multiplied until they have d to all parts of the northwest, where greatly outnumber any of the native nd birds. While none of the native es have been found adaptable to farm ture, the Mongolian variety is said to ell fitted for such breeding. In bad her, when the game fowls are de- ed of feeding grounds, the state sup- the food wherever large numbers of can be found. Wild ducks inhabit- at section are kept from migrating the winter months by the attraction eed provided for them, and these birds freely with pheasants and other fowl the game preserves. Approximately 0.000 are collected annually by the te for hunting and fishing licenses. BACK-MORTARED BRICK WALLS CUT SMALL-BUILDING COST lesigned for small homes, garages, and ar buildings, a type of brick-wall con- ction which employs a backing of rtar is said to reduce consumption of terial and provide ample protection inst heat and cold. Since the cement tions can be easily applied by the same rkman who erects the sonry, no extra ex- ise is necessary for litional labor. The tem of construction, ich affords consider- e strength to the wall, ults in a fireproof par- on. Each part is nned to bear its usual ire of the supports of a ulding and requires less e than ordinary walls rcompletion. Although s strengthened at reg- r intervals by pilasters | brick, its use is claimed accomplish a saving of in two to five bricks a lare foot. ART WORKS FROM BABY SHOES MAKE USEFUL KEEPSAKES Serviceable keepsakes, modeled from baby shoes after they have been outgrown Novel Keepsake Ornaments and Useful Bric-a-Brac Formed from Outgrown Baby Shoes by infants, are being made by a San Fran- cisco artist, who metallizes the tiny foot- gear. The shoes are then used as parts of ornamental articles such as candle- sticks, ink stands, and flower holders. The application of the metal process prevents the shoes from losing shape and protects the surface. Bases of wood, metal or stone are added as supports for the works of art, which make attractive and lasting mementos of childhood days of interest both to parents and children. Section of Back-Mortared Brick Wall Showing Cement Inset Which Reduces Material Costs and Provides Protection from Heat and Cold

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908 POPULAR MECHANICS se3C gies o - # « ery r Fire-Fighting School to Save Forests Boy Scouts Are Taught How to Put Out Experimental Blazes Started in Woods of New Mexico Preserve a will be the toll of the forest fire this vear? As tourists set out for their summer playgrounds in Uncle Sam's woods and the dry season approaches, some 20,000 alert rangers and specially hired forest firemen in state, government and private service, are anxiously scan- ning the horizons daily for traces of raids from the “red enemy” that last year con- sumed about 537,000 acres of our national forests alone in more than 8,000 separate fires. The dryness of the season was held chiefly responsible, but more persons are flocking to the parks each year, and eighty per cent of all the forest fires, according to government officials, are caused by hu- man carelessness. Lightning ranks second. The trees will have at least one factor in their favor—a larger number of experi- enced fire fighters on the job than ever before, organized in units, in many parks, and equipped with fast horses, motors and airplanes. Forest fires, like their city and town cousins, are tricky. There is a tech- nique to the business of fighting them. When blazes get bevond control, appeals for experienced men are broadcast. Vet- erans came pouring in from New Mexico and Arizona, three years ago, when dev- astating fires swept through California to take charge of hundreds of willing but “ovreen” and sometimes too enthusiast volunteers who unwittingly helped tl fire occasionally, instead of quenching it Sut the forest service is not waiting f fires to train veterans. It is making the: in a school where officers of the servic: are the instructors and actual fires, set real woods, are the laboratory material. This school is kept in the Mazaro na tional forest, in New Mexico, where stretch of woodland has been set aside f: the purpose of training boy scouts an others in the correct methods of suppress ing the flames. The students dig trenche make flank attacks and learn how t charge the foe. The tactics of fighting ; forest fire are said to be not unlike those of an army in battle. In the early stages if there is no wind, a fire generally spread in a circular area. If driven by a breeze it assumes the form of an ellipse or an oval with the smaller end at the point where it started and burns slowly agains! the wind. The fighters, divided into tw groups, endeavor to cut the line of fire 11 half and advance toward the head where the flames are being fanned by the breeze In mountain areas, while efforts are mad to extinguish as much of the fire as pos neewyw Em. eae OST iLe

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raping away POPULAR MECHANICS 909 a big conflagration can best be | by driving it toward natural bar- such as lakes or steep barren cliffs, rrounding it with a back-fired strip it it will kill itself. ‘se tactics, so far as is practicable the position of the tract in which the started, are taught the pupils at this ie school. They are also shown how e some of the implements the fire ters carry. e include an for boring er holes to blast ld stumps and from the path idvancing fires; brush hooks knives; hoes for | es ; e e needles, grass leaves; shovels mother sparks flames and dig hes; water bags buckets. With portable hand » for extinguish- ing purposes has come a portable torch for saving time in setting back fires to make barren gaps where flames will halt. Students are like- wise taught the impor- tance of using their heads. “Fighting for- est fires is not a par- ticularly hazardous job,” declares Col. William B. Greeley, chief of the forest service. “It requires ghting Forest Blazes in Oregon; Using the Portable ch to Set a Back Fire; Fellers Sawing Down Snags and, Bottom, Smothering Flames with Dirt cool heads, common sense and an experi- enced and trained force. There are times, however, when a fire breaks over the fight- ing line and causes a stampede among green men.” Resourcefulness is consid- ered as big an asset to the fire fighter as it is to the soldier making a night attack on an enemy trench. Applicants to the service sometimes get this question from an examiner: “What would you do with a fire fighter who broke his leg on the fire line?” The reply and the time it takes to formulate it are an index to the mental alertness of the candidate. That this quality is often tested is borne out by many incidents in the fire fighter’s career. For instance, speeding down a steep hill in a burning forest zone, a big motor truck loaded with forest rangers collided with another. The firemen leaped to safety before the crash which wrecked

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910 the: vehicles, but they found themselves surrounded by the fire. They promptly ripped the gasoline tanks out of the cars, carried them to a tiny stream and covered them with wet sacks. The flames were halted, and both men and fuel were spared by a little quick thinking. Systematic forest protection in the United States is only about twenty-five years old. While much has been accom- plished with forces of trained rangers, and airplane patrols that not only keep watch for fires, but make maps of forest areas for the guidance of the fire fighters, the task of protecting the timber supply from the hazards of flames, is said to be only one-third done. Fire prevention is regarded as three-fourths of the national- forest problem, an important issue to not less than fifty different industries that de- pend on wood, from builders of homes to makers of clothespins. The other fourth is the job of replanting burned and cut- over areas, a territory said to be equiva- lent to the combined forests of Germany, Holland, Belgium, France, Switzerland, Spain and Portugal. Lumber, in the last eighty years, has advanced three and one- half times faster in price than the average staple commodity, and consumers are pay- ing an annual freight bill of about $250,- 000,000 to have boards hauled from the Pacific coast to the Atlantic ports near regions that once abounded with native timber. Three-fifths of our original lum- ber already is gone and the demand is POPULAR MECHANICS four times greater than the rate trees are being grown. The total number of fore fires throughout the country is betwee 30,000 and 40,000 annually. In 1924, tl field service to protect our forests in na tional parks cost less than $3,000,000 i salaries and wages. To greater thoughtfulness from the pub lic, increased vigilance and improved skill on the part of trained fire fighters, the government largely entrusts preservation of its precious woods. NEW WIRE ROPE FOR INDUSTRY RESISTS UNSTRANDING One of the disadvantages of wire rope its tendency to unwind when cut o: broken—has been overcome in a cable now on the market. Its strands are “pre formed” before they are united in the com pleted product, that is, they are twisted in to the shape they are to assume and then combined. This, it is claimed, not only keeps them together, but also distributes the strain more evenly, prolonging the life of the rope. When individual wire break, they lie flat instead of sticking out of the cable and fraying. A special steel fitting is also provided that grips the strands firmly, permitting the use of shackles and turnbuckles. The cable is now being manufactured in sizes up t one-inch in diameter, and is in use for oil drilling, industrial hoisting of all kinds and in factory and shop operations. Rakes Often Are Effective Weapons against a Forest Fire; Fighters Close to the Front Lines Use Them to Scrape Back the Twigs and eaves on Which the Flames Creep Toward Trees and Logs

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POPULAR MECHANICS 911 MOUNTAIN MOVES MANY FEET iveling slowly, with velike motion, “Mov- Mountain,” a peak it 2,000 feet high, in rado, is shifting at base and spreading ss Rio Blanca valley. slope of the moun- said to be formerly n angle of forty-five rees, appears to be ing down into a more ual incline. In little re than a day the untainside has moved feet, and is reported be disturbed by tre- rsresemblingtheslight lling of the ocean sur- ce. The present activ- of the peak is said to the second of its kind that point in fourteen years, the last ement resulting in a_ considerable ange in the position and formation of mountain. Similar activities have been served in other hills in nearby regions. FIRST-AID CARS FOR AUTO ILLS SERVE MOTOR CLUBMEN When motorists belonging to a Chi- ro club call for aid in car emergencies, t-aid trucks equipped with a winch and ble, devices for starting stalled engines d complete apparatus for curing almost every auto ill, are sent to their assistance. \ fleet of about twenty of these rescue cars has been established in what known as the “mudhen cruiser it” and is expected to render lar greater help than was possible vith the former motorcycle idecar equipment. The cable is 200 feet long, per- mitting the first-aid truck to remain on solid ground and ‘onnect with a tranded or mired car with little diffi- culty. A specially designed generator ind over-size stor- ige battery have been installed for tarting cold en- fines or reviving run-down batteries. Rear of First-Aid Truck with Windlass, Tow Rope and Tool Box in Body Diagram of Lens, Its Three Magnifying Fields Shown in ro Corner, and Different Ranges It Allows Wearer in Actual Use THREE PAIRS OF GLASSES IN ONE PROVIDED BY NEW LENS Science has produced an additional aid to faulty eyesight in a lens that affords three fields of vision instead of the two furnished by the usual bifocal glass. It consists of four sections ground from a single piece, an upper one for far sight, a lower part that magnifies distinctly for close work, and on either side of these, an intermediate area for distances of eighteen to fifty inches. A chief advan- tage claimed for this lens is that it elim- inates the blind spot or “jump” where the two surfaces on the bifocal glass are joined. Light is deflected here and does not reach the eye. More accurate cor- rection of vision is obtained with the three-field lens, it ts said, and the dan- ger of accidents through failure to see steps and ob- stacles is decreased. The user employs the intermediate area by a sideward glance and quickly becomes accus- tomed to glasses of this type. They are aimed to fill the needs of business men, motorists, me- chanics and clerks.

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912 Automatic Horn and Lights That Tell When Car Exceeds the Lawful Speed Rate HORN HOWLS AS AUTO SPEEDS TO WARN DRIVER Automobile drivers who run their cars faster than traffic rules allow can be warned by a horn which sounds and turns on lights when the speed limit is reached. Fastened to the front of the machine, the signal starts automatically and keeps up its noise until the pace is slackened within the rate tor which the device is set. Even with speed gauges, the horn acts as an accurate caution should there be any de fect in the operation of the meter. Attached to traffic patrolmen’s cars or motorcycles, when trail- ing speeders, the signal may be used as a means of telling whether the “suspect” is traveling faster than the law per- mits or not. @in California, more than 10,000 farmers’ wives cook by electricity, ac- cording to a power dis- tributing company. POPULAR MECHANICS SMOKE SEEN AS CANCER CAUSE IN SOOT-POLLUTED CITIES Coal smoke and soot in large America cities cause an annual property damage . about $7.66 per capita, the bureau of min estimates, and to this evil, another seriou charge is added by Dr. J. B. S. Halda: a British health authority. He declare that these agents may prove to be a source of cancer. As products of incomplete combustion, they are said to contain the same bodies found in tar and soot b which cancer has been produced artificial! in animals in laboratory experiments. A general lowering of resistance to variou diseases is also attributed to the smoke polluted atmosphere in many large citie The evil is being combated by careful fi: ing and use of smokeless fuels. FENCE RAIL ACTS AS WATER PIPE TO SUPPLY LAWN SPRINKLERS Iron pipe used as the top rail of a wi fence surrounding a park in California being employed to conduct water f sprinkling the lawns and flowers. TI tubing is connected at the corners a1 taps are inserted at intervals so tl water can be supplied at any point arou: the inclosure. By serving a double pur pose, the rail eliminates the expense a1 labor that would be required to install a: underground system. Leaks in the lin can be quickly detected and repaired in short time, thus saving losses of wate which might otherwise continue over lo: periods before being found. % \ \ 2 “eo. 2 - \ » SO ‘ * * al . Watering Hedge and Lawn Border through Top Fence Rail Made of Pip Which Has Been Perforated to Serve as Sprinkler

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POPULAR MECHANICS 913 Experimenting with Pilotless Aircraft; When Catapult Is Released, the Plane, with Motor Running, Shoots Sharply Upward; from Then On, Radio from the Boat Is Its Unseen Guide PILOTLESS PLANE LAUNCHED FROM TRAP ON WARSHIP Guided in their flights by sensitive radio- mtrol apparatus, pilotless airplanes be- ng tested in France and England are unched from a catapult arrangement on e bow of a warship. The steel runway ints upward at such an angle that the ine swiftly gains sufficient altitude and, nce in the air, the craft is steered by lio impulses sent from wires rigged on e ship's masts. While this innovation flving is yet in its infancy, experiments eady indicate its practical success. BEES CAGED WITH PLUM TREES TO INSURE RICH CROPS In the great plum-growing districts of rthern California, bees are being caged ith the trees to insure pollenization of he blossoms with pollen only from other trees of equal quality. Much loss has heen occasioned to growers in the past ue to cross-fertilization of their pure- ‘red plums with pollen from wild species nd inferior varieties of the domestic fruit, resulting in crops of poorer grade and aller size. A framework covered with rong mosquito net is built around each ee, and a hive of bees is installed in the losure when the blossoms begin to ap- ear. Freshly cut flowers from plum trees ' equally good grade with the one caged, are supplied to the insects each day and from these blossoms the little workers carry the pollen to their home tree. Cages have also been equipped with wheels so that an entire orchard can be covered with only a few of the inclosures in a short time. OILCAN CRATE TIPS IN POURING AND PREVENTS WASTE An oilcan crate equipped with a stand that automatically adjusts itself to the normal position can be easily tilted for pouring the liquid, protecting the clothing of the handler and pre- venting waste or splashing. The container is also fitted with a mov- able spout which avoids dripping after the holder returns to an up- right position, thus keeping the outside clean and dry. When the tilting attachment is not required, it can be swung up over the can and becomes the top of the crate. No hinges or. protruding nails, injurious to clothing, are present on the box, which has been patented.

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914 POPULAR Plainly Striped Crossing Sign Placed in Middle of Road as Warning to Motorists WARNING SIGNS IN ROAD CENTER LESSEN CROSSING DANGER Increasing the safety of autoists and others using the highways, danger signals are being placed squarely in the center of roads leading to railroad crossings. Driv- ers of approaching machines are forced to turn out a trifle to avoid a collision and naturally notice the sign. Encased in a concrete base, the signal cannot be broken by the impact of an automobile and painted in distinctive colors, it is visible for a long distance in both directions. ANNEXING OF SOUTH SEA ISLE ADDS TO U. S. DOMAIN Known to map makers under five dif- ferent names, Swains island, a tiny dot of land in the South seas, is only a mile and a half long and a mile wide, but since its discovery, believed to have been made by Spanish explorers in 1606, has been inde- pendently governed. To geographers it has existed as Quiros, Gente Hermosa, Olosega, Jennings island, and as Swains island will now appear on the map as part of the United States, since its recent an- — .o ea aoe ap a ana. MECHANICS nexation by this country. The isle has a population of seventy, and is surrounded by a coral reef with an opening at one end through which small boats can pass. WHAT DOLLARS COST TO MAKE According to Charles S. Dewey, assist- ant secretary of the treasury, it costs one and seven-tenths cents to print a dollar bill and it has a very short life. But a sil ver dollar can be minted for one cent and it lasts indefinitely. This is said to be one of the reasons for the government’s de- sire to put the metal coins into circulation It is estimated that 40,000,000 silver dol- lars, replacing that many paper bills, would save the government $1,000,000 a year. SUITCASE ON FOLDING WHEELS IS AID TO TRAVELERS Intended mainly for travelers who do not wish to go to the expense of hiring taxis or porters when only small distances are to be covered, a suitcase with folding rubber-tired wheels and a long steering handle has been devised. The running gear is strongly attached to slide roils within two tubes at the top of the case, and when the carriage is not desired, the wheels, with their forked spindles, are drawn close to the carrier and the handle folded down so that the outfit occupies little space. The supports are enough to permit a small child to ride astride the case. stout Suitcase with Wheels Folded and in Use as Cart for Hauling Small Child

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POPULAR MECHANICS 915 ld (Xo I the refuge of runaway slaves, the homing grounds of the Seminole lians, the mystical Everglades of sunny orida are now being drained and med as America’s potential sugar owl, \t an aggregate cost of $22,000,000, the ‘atest wamplands of the whole world being reclaimed and adapted to truck pp and sugar-cane production. The eading agricultural experts of the coun- have surveyed the Everglades, ana- ed the black-muck soils which are from twenty feet deep and have pro- med the region a tropical Eden. (he tormation of the ’G!ades is peculiar | has developed unusual drainage con- tions. These soils cover a tract as large the combined areas of Rhode Island Delaware. Ages ago, this vast belt nothing more than the rock-lined bot- of the ocean. Enormous quantities vegetation have accumulated and de- ed there. zest zone of peaty muck known to man. volumes of water are impounded in its rock-rimmed borders. Mighty e to ] Today the Everglades is the By G. H. DACY largest lake in forty miles in ex Lake Okechobee, the Florida—thirty-five by tent—acts as a sort of sump basin. By lowering and controlling its waters, engi neering science is draining the Everglades For this project is not only a gigantic drainage enterprise, it is also a water-con trol system which, when completed b means of ditches, dikes, canals, locks and pumps, will handle the normal and flood waters of the district Six canals are now in operation carrying the surplus moisture of the Everglade down to the sea. Ten million dol been expe ne led and hundreds of thousand of acres of Florida’s most fertile soil have responded profitably to intelligent cult vation. Florida is preparing to complet the stupendous drainage project by the e penditure of $12,000,000 for additional canals and lateral ditches which potential! will convert great areas of idle acres into well-tilled farms. Three years ago, two large sugar mill were built near the rim of the Everglade Previously, it had been demonstrated that sugar cane could be profitably grown aTs h ive

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V16 The earliest settlers in Florida brought with them supplies of sugar cane from which they established new patches. The Seminole Indians, the runaway slaves and the outcasts of civilization who once lived in the swamps, all raised their supplies of sweets from sugar cane. From these pioneering attempts, the current industry came into being. Untoward floods have complicated the cane harvest during the last two seasons. These washouts oc- curred because the Everglades drainage system had not been completed. But when the water-control enterprise is fin- ished, the drained Everglades will become America’s newest sugar bowl. The 3,500,- 000 acres of swamplands yet to be drained have been organized and an adequate en- gineering survey and plan of reclamation have been worked out and accepted. Work is now under way to finish the last lap of a salvage project which will liberate another agricultural empire from water- logged bondage in the land of our last frontier. “What is the matter with Louisiana as a Sugar-cane supply source?” you logically may inquire. A dread disease of sugar cane, known as mosaic, which stunts the growth of the cane and curtails the sugar yield now is dominant throughout the Louisiana su- gar-raising country. The only known con- trol is to develop disease-resistant varieties of cane. Louisiana must now look: to other southern states for future seed sup- plies. Florida is most propitiously located POPULAR MECHANICS to supply this seed, for the sugar-cane growing regions of Florida are wholly free of infection. Furthermore, Uncle Sam’s experts in Florida have developed one species of cane which is resistant to the destructive disease. Latterly, congress made a special ap- propriation of $25,000 to establish a sugar- cane research station in the Everglades i; the vicinity of Canal Point, seventy-five miles from West Palm Beach. Here fhe government will test every variety of sugar cane to ascertain its adaptability to Eve: glades conditions. It was through pre vious experimental work of this character that the mosaic-resistant species was oric- inated. The national sugar experts no have available enough of this seed to plant fifteen acres. They expect from this planting to produce enough seed and cut tings to save the Louisiana sugar indust from portending failure. Uncle Sam now has available forty 0! the parent plants of the La Purple, Ka soer, Uba, Java and Crystallina varieties of sugar cane that have demonstrated their value in Florida as well as a numb: of new specimens from the Virgin island The government experts also are makin» scientific studies of wind velocity as it a fects sugar-cane culture. Moisture gaug: are exposed at various points in order th. tab may be kept on any changes whi occur. An interesting feature is the pr: agation beds, which are provided wit oil-burning heaters to hasten the germi: tion of seed samples which are tested. The yield of sugar cane has run as hig as sixty tons to the acre in the Everglade This production is four times as large : the average vearly crop in Louisiana. Specially Designed Cars, Emptied by One Operation of a Dumping Tipple, Facilitate the Hauling of the Newly Harvested Sugar Cane from the Field to the Mills ~ a maior WeyrTwT Aa Wy a rcCcwmwmooeestiyryAtTwyTrt~ct

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POPULAR MECHANICS a : Sugar Mill Located on the Rim of the Everglades, Draw- ing Its Raw Materials from Rich Soils Reclaimed from the Deep Swamplands; Be- low, Giant Crane, Loading Cars with Cane

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918 POPULAR MECHANICS PHONE ON FIREMEN’S HELMETS TO AID RESCUE WORK Helmets fitted with a telephone, to en- able fire fighters in a smoke-filled building U. S. FLYERS COIN NEW TERMS TO DESCRIBE WORK Just as the army and navy have the special slang expressions, so the air ser ice has developed a cabulary all its own. officer who cannot fly the New Zealand bir, with undeveloped wing “Ground flying” describ: talk about flying; a m is in a “flat spin” wh« he becomes confused conversation, and if talks too long, he is give a gentle hint to “lan by making the letter ‘ of two matches, the out line of a plane. “Wash: out” is the aviator equivalent for gettin killed, and “cracked u means wrecked. Ant aircraft guns are call “Archies.” A plane o any kind is spoken oi ; a “job”; “prop” is sh« for propeller and “give ’ the gun” is the aer equivalent of the moto: ist’s “step on the ga To “set down” is to lan but if a flyer falls a fe feet when running par: lel to the ground, | planes with Hispan Suiza motors are call “hissos,” a “Jenny” is Firemen, Demonstrating the Portable Telephone Outfit; Speaker Is Carrying plane with a JN-type + Batteries, Receiver and Mouthpiece Are Concealed under the Other’s Helmet tor. The “barrel roll to communicate with their comrades out- side, have been tested in the east. ~The cable is carried on a reel that unwinds be- hind the firemen. The batteries are car- ried in a frame at the side of the operator who remains in the street. The helmet also serves as a gas mask to protect the wearer. ISSUE “GRASSHOPPER” STAMPS To finance a campaign against grasshop- pers, the Mexican government has put a spetial postal tax in operation. All do- mestic mail matter will be subject to an extra charge, and a special “grasshopper” stamp on each parcel will represent the payment of the tax. a complete revolutio: lengthwise, “zooming” is to climb sharp for a short period, and “sausage” is th: name for a small dirigible or balloon. GIRL FINDS NEW MOTOR FUEL WITH AID OF SUGAR Said to be twice as powerful as gasolin and costing but half as much to produc: a new motor fuel has been discovered | a fifteen-year-old French girl. A chic ingredient is “irol,” a heavy explosive {: which chemists unsuccessfully had be: seeking a solvent, but which the girl final dissolved with ordinary table sugar as principal substance in the process. At t! dinner table one day, she suggested to he father, in whose laboratory she worked : _known as a “kiwi,” after speaker at a banquet “pancakes.” Training

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POPULAR MECHANICS nior assistant, that the explosive might idapted to use by means of carbon in form of sugar. The father dismissed idea as impractical, but the daughter rted experiments. After trying a num- of supplementary chemicals, she finally ind a mixture which converted the ex- sive into a yellowish liquid suitable for in motor engines. First tests were le with the family automobile, in ich the fuel fully demonstrated its ef- tiveness. These tests have been. fol- wed up by experiments on a larger scale | the results of them also are reported ive proved altogether successful. LOUD SPEAKER NINE FEET HIGH HELPS TEACH PUPILS RADIO Radio instruction for pupils of a Brook- n high school is simplified and made ore entertaining with the aid of a loud eaker, eight and one-half feet high, erected in the assembly hall It is con- nected to an eight-tube superheterodyne et and is said to produce tones of such uality and distinctness that they can be heard easily by persons in distant parts ithe large room. It was constructed by sanbers of a radio club at the school and int Wooden Loud Speaker High-School Pupils Con- structed for Use in Assembly Room e greatest care was exercised in putting together in order that undue vibration ] te . . loss ot volume might be avoided. sam weTrTwT ia We arwswa‘SeUT POU lUCU OT Or Or 919 METAL WORTH MORE THAN GOLD USED IN TESTING MACHINE Metals more precious than gold are used in a machine built by the bureau of stand ards. Palladium and an alloy of iridium and osmium, rare ele- ‘ ments of the plati- f Copyright, Harris & Ewing Precise Steam Gauge of Metals More Precious Than Gold Used in Bureau of Standards Tests num family, and pure silver are employed in constructing this costly piece of lab- oratory apparatus. A tiny bit of the alloy of iridium and osmium, no larger than the top of your small finger, has a valuation of $15. A fragment of palladium, not as large as a common office rubber eraser, costs in the neighborhood of $75. Pure silver, while not so costly as some othe precious metals, is more or less expensive when used in quantity. The construction of this mechanism of precious metals, however, will serve the needful and use ful purpose of formulating precise steam tables. That is to say, if you are one of the millions of citizens who ride on rail way trains or otherwise a beneticiary of the motive power or use of steam, this bit of laboratory equipment does not represent extravagance, as it will enable engineers and others engaged in harnessing and using steam to better understand its be havior and to apply it more efficientl) Water vapor, or steam, as it goes throug! this experimental apparatus, built of pre cious metals, would contaminate the baset elements and thus impair the usefulness of this testing equipment. This is not true with respect to the palladium and pure silver. The vapor or steam thus con trolled and studied will have a tempera ture of about 575 degrees Fahrenheit and a pressure of 1,250 pounds to the square inch, yet this assembly of costly metals will not corrode or otherwise be contam- inated by the action of this hot vapor now

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920 POPULAR MECHANICS ONE-MAN TRACTOR SCOOP COPPER AND TIN SUBSTITUTES REPLACES MANY TEAMS DEVELOPED IN GERMANY With a tractor scraper now on the mar- Aluminum is being used as a substitute ket, one man, it is said, can do the work for copper in the electrical industry of several horse outfits on grading or Germany, in spite of its softness and k melting point. Conductors of this metal with steel tubes are now often used. Tec! nically pure aluminum, it has been found, possesses some of the qualities which cause hardness in duralumin, the alloy which the framework in the dirigible “Los Angeles” is made. Small additions of copper and magnesium seem to improve the basic aluminum when it is subjected to high temperatures. Lead is taking the place of tin as an alloy for bearing metals, but bronze is still being used { heavy work. “4 PORTABLE OIL WATER HEATER REQUIRES LITTLE SPACE For homes where running hot water not available, a portable kerosene heat: that occupies but fifteen inches of floor space, may be placed beside a bathtub, sink or laundry basin where it is to be used to save carrying, splashing and other di comforts. A faucet at the bottom lets th: water run out directly from the container thus preventing loss of heat. Rear View of Tractor Scraper, Showing How Control Is Managed from Driver's Seat similar jobs. It has a revolving scoop controlled from the driver's seat by simply pulling a rope. With little effort it can be adjusted for dumping, spreading, level- ing or loading, and each operation is per- formed while the tractor is going forward. Thus the trouble of reversing and delays in stopping are eliminated. The scraper is durably made, has no parts that need oiling or attention, and is manufactured in five, six and seven-foot sizes. = = PUTTING DIAMONDS TO WORK Diamonds employed in industry are mostly used in their natural state. They are sometimes cut for special work, but are generally set in steel holders for tru- ing and shaping grinding wheels. Two types are commonly employed, “borts,” those of crystal formation, and “carbons,” the black Brazilian stones which are gen- erally considered to have greater resist- ance than the others. The supply of these is limited and their use is largely confined —— to drilling. Diam s also ¢ s i mr ; 5 — onds ilso are used in Filling Bathtub from Portable Heater, Which Is Spx stone saws, wire dies and glass cutters. cially Suited to Small Rooms 999 POPTITAR NMERCTHANTCSE

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POPULAR MECHANICS 921 Steering Sunken-Log Lifter into Shallow Water to Raise Heavy Timbers from Bottom of the Stream SUNKEN-LOG LIFTER DOES WORK OF OVER FIFTEEN MEN To economically reclaim sunken logs, a lifter has been made that may be oper- ated by two men in from twelve to eighteen inches of water. It is said that it will easily do the work of from fifteen to twenty men working with the old hand methods. The device is operated by a mall gas or kerosene engine installed on bargelike floats. By reversing one of the paddle wheels, the craft may be turned around within its own length. The ma- chine is especially adapted to reclaiming logs through the south, on account of the iree movement in shallow waters. PAIN FINDER LOCATES CAUSE OF STOMACH ILLS Vagrant aches and pains which often afflict the stomach and are hard to identify may now be accurately located and classi- fed by an instrument resembling a minia- ture seismograph, the device with which earthquake tremors are’ recorded. The pain finder, devised by Dr. W. C. Alverez, of the University of California, is said to register the course of such ills in almost iny part of the abdomen and to clearly eveal every step of the digestive proc- esses. By the recorder, the passage of food through the digestive tract can be closely followed, and the exact spot and instant of the setting up of any trouble definitely learned in a few minutes. The instrument, called the multiple-electro- enterograph, is said to obtain its data by means of a pendulum swung in a vacuum tube, and marks its records with a needle. AUTO SPOT AND TROUBLE LIGHT ARE COMBINED IN ONE An automobile spotlight which can be quickly removed irom its position for service as a trouble lamp, clamps to the bottom of the wind- shield frame. A ball movement allows the rays to be directed to any point in front of the car. Focusing is done by pulling the light in or out through the collar. When needed for repairs the lamp can be easily lifted from the hold- er by loosening a small screw. It throws a wide beam of light which can be ad- justed as the driver desires for reading road signs or illuminating the path ahead. whnoor.rnrewywr?yey av eae eae es oe ae See ee ee wl nae

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POPULAR Street-Car Safety Exit Which Is Automatically Opened by Passenger’s Weight as Car Stops SAFETY DOOR ON CAR OPENED BY PASSENGER’S WEIGHT The weight of a passenger standing at the exit in the vestibule of a trolley causes a safety door to open automatically when the car comes to a stop. As the rider MECHANICS leaves the car step, the door shuts, relea ing a control lock which prevents the motorman from starting again until a entrances and exits are closed. The ap- paratus is so delicately adjusted that the weight of a small child is sufficient to op erate the device, which relieves the crew to devote more attention to trafhe and other duties. It is believed the self-oper- ating exits, which were developed by the Chicago street-car system, will serve to reduce accidents materially. FLOWER SCENTS IMPAIR VOICE, SINGING EXPERT DECLARES According to a European authority, the mere act of smelling strongly scented flowers temporarily impairs the voice while if indulged in unchecked, it may prove disastrous if the singer is attempt ing high notes before an audience. Vio lets, roses, the lily-of-the-valley, the narcissus and the white lilac are said to be especially harmful in that they pre vent clearness of vocal sounds. Violets if freshly cut, vary in effect according to different individuals. In some cases, the) cause an almost total loss of voice, while in others, they create a peculiar hoarse ness and dryness in the throat. Rose scents act similarly, although the white and yellow varieties usually impair the voice less than the red-bloom scents, it is reported. HELIUM TO HELP DIVERS AND THE “SAND HOG” Helium, the wonder gas that will not burn or explode and which is therefore in great demand for lifting Uncle Sam’s giant airships, is now to be used in deep mining operations, submarine tunneling, bridge building and other tasks that can be con- ducted only with the use of compressed air. Workers on these jobs perform their labors under tremendous pressure and after they have finished, it is necessary to “decompress” them, that is, restore them gradually to normal air conditions. Here- tofore, nitrogen-oxygen mixtures have been used for this purpose and decom- pression has been a long process attend- ed with some danger because of the tend- ency of the nitrogen to leave bubbles in the blood which are likely later to produce paralysis or death. Experiments con- ducted by the bureau of mines on guinea pigs and men have shown that, if helium is mixed with the oxygen instead of nitro- gen, the danger of tormation of bubbles nmoaa wromaseyrrYTryTr ia wT is greatly minimized and the decompres sion process takes only one-sixth of the time required for the present method With the use of helium, it is believed, diy ers will be able to labor for longer periods than they now can and penetrate to great er depths. When men get caisson dis- ease they are treated in a steel lock. The helium-nitrogen mixture, it is pre dicted, will prove useful here also. Pres- sure in the lock is raised to that at which the victim has been working and is kept for some time at this point to elimitate bubbles that may have formed in the blood, then gradually reduced to normal conditions. The apparatus is cylindrica! and is divided into two compartments of equal size. The inner one is fitted with a cot for the patient and various instruments for the physician’s use. The victim can be observed through a glass window in the side, and the pressure is regulated by both outer and inner controls. agwseaoeyrypaeaTrea

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POPULAR MECHANICS Glimpses from World of Work Under- ground; at Top, Cross Section of Cylinder for Treating Compressed-Air Illness; Cen- ter, Caisson Locks in Which Men Become Accustomed to Different Pressures Grad- ually; Regulating Helium and Oxygen Flow to Restoration Tank, and Diver at Work in Subway a. ae ‘ ” , - oncieiiiiads "Sx: : ; Se

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924 POPULAR SHOCK ABSORBER AND JACK ARE COMBINED IN ONE A combination hydraulic jack and shock absorber has been invented to give greater Raising Right Front Auto Wheel with Combination Jack and Shock Absorber by Releasing Inner Cylinder from Control on Instrument Board riding comfort and use in emergencies. It consists mainly of two telescoping cylin- ders operated by oil pressure from a mo- tor-driven pump under the engine hood and controlled from the instrument board. On the road, the attachment is said to take up the jars and shocks in the manner of a big spring, and when the jack is needed, the extension cylinder that is to lift the car is forced out as a stream of oil enters it through copper tubing from the pump. Any one or all four wheels of the auto may be lifted. NEWSPRINT MADE FROM STRAW TO SAVE WOOD PULP With the increasing shortage of wood pulp, comes an encouraging announce- ment from London that a Frenchman has discovered a process for making newsprint paper from straw. The only chemicals he uses, it is reported, are common salt and lime. The brittleness of the product, which heretofore has limited its use in this field, is said to have been overcome. Not long ago, an English daily appeared for the first time, printed entirely on this ma- terial. A factory is under construction in Canada for making it at the rate of fifty tons daily. Waste straw that now is be- ing destroyed in great quantities each year will be utilized. The new paper is said to be white and tough. MECHANICS TENNIS BALLS THAT WON’T LEAK TO IMPROVE GAME One of the disadvantages of the usual tennis ball is that it grows “dead” throne loss of air, and the plug placed inside to seal the shell sometimes inte: feres with its bounce These difficulties are said to have been overcome by an improved manu facturing method an ex pert golf-ball maker ha evolved. He eliminate the plug entirely by u ing two. guttapercha spheres. They are ce mented together, a rub ber skin put over then and then they are placed ma mold where they are heated to about 300 de grees Fahrenheit. Thi vulcanizes the rubber to the guttapercha and form causes gas to anc expand the ball to the proper diameter. The mold is cooled in ice water, and a felt coy ering slipped over the rubber. Balls made by this method, it is said, can be standard- ized as to bounce and compression. REMINDER ALARM ON TIMEPIECE CAN BE SET FOR ANY MINUTE The elapse of any number of minute can be marked by a reminder clock whic! rings an alarm when the interval has passed. Time, from one to ninety min utes, can be indicated by the signal, whic! is controlled by the adjustment of a small figured dial. The time- piece is designed to be fastened to a wall or may be set on a table. Used to time processes in factories and laboratories, the instrument serves as anaccurate guide, relieving workmen for other tasks while awaiting the completion of the measured operation It may also be employed in the kitchen to prevent overcooking of foods. An ordi nary twelve-hour alarm is also contained in the clock, which is independent of the short-interval timer.

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POPUEAR MECHANICS 925 Bullet-Nosed Locomotive for Express Service on French Railroad Is Built to Pierce the Air Like a Projectile, Decreasing Wind Resistance at High Speeds ENGINE IS SHAPED LIKE BULLET TO RESIST WIND PRESSURE For hauling heavy express trains on a rench railroad, a locomotive that rivals e monsters common in this country, has ist been put into operation. It weighs IS tons, is over fifty feet long and has ht enormous driving wheels. Its nose haped like the sharp end of a bullet to educe the air resistance. A low smoke- tack with a swinging lid, a cab without de windows and a general streamline esign are other points that distinguish engine from the usual locomotive. LIMIT TO SPEED OF AIRPLANES IS SEEN BY DOCTORS \rmy air-service surgeons declare that viators have about reached the maximum peed at which they can suddenly change lirection without suffering serious results. ‘he rate is placed in the vicinity of 250 miles an hour. The limit on a straight- away, they say, can be put much higher. On the turns, at high speeds, as shown bv the experience of Lieut. Alvin J. Williams, who banked his plane around sharp urves while flying at a rate of nearly 245 miles an hour at the Pulitzer races in 1923, the cen- trifugal force exerted on the body and its ef- lect on the blood, cause the flyer to become practically unconscious. Greater speeds, the sur- geons say, might rupture a vital blood vessel. The height limit is placed at 45,000 feet. Even with oxygen apparatus, it is believed that, at greater altitudes, the available oxygen supply in the lungs would be too low to sustain life. At extreme heights, aviators suffer drowsiness, fits of giggling and laughing, muscular weakness, short- ness of breath and impairment of the in- tellect and judgment. NEW CHURCH BUILT ABOUT OLD WITHOUT STOPPING SERVICES While workmen were erecting a larger brick church around a smaller frame one in New York city, weekly services and other activities of the congregation were interrupted only to lay the floor of the new structure. Timbers from the wooden church were carried through door and windows of the outer building. The task was simplified by the position of the old church, set well back from the street, a self-supporting trussed roof and the sence of a cellar. ab- While Brick Walls of New Church Were Rising around Old Wooden Struc- ture, Services in Latter Were Not Interrupted

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Latest Fads and Fancies in Water Chinese Games on Life Rafts for Tables, and Surf-Riding on a Rubber Horse That Rolls Over in the Break- ers, Add Novelty to Beach Sports 2] Acrobatic Stunts on a Skimming Surf i | or Furnish Thrills for mrameore i ; and Test the Nerve and ill of a L Fighting p= Se | Plucky Team of Performers Who Must = Ring-Side Seats | | Balance with Utmost Care *.

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Sports Seen at Nation’s Beaches Swimmers May Enjoy Radio Concerts from a Set on Pool Platform; Right, a Floating Rubber Tub Permits Combina- tion Sun and Water Baths Lighting His Way with Flaming Torches Held in His Hands and Grip- ping the Tow Rope in His Teeth, This Skillful Aquaplane Rider Enjoys the Daring Sport at Night J Taking It Easy Is Often yt . the Best Way toSolvethe § Kc ——— — Cross-Word Puzzle E

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928 POPULAR Polishing Metal Mirror before Shipment; Refection of orkman Seen as Clearly as in Glass POLISHED METAL FOR MIRRORS IS SUBSTITUTE FOR GLASS Sheet metal covered with a highly pol- ished nickel preparation is being used as a substitute for glass mirrors on table tops, doors and many other places. Aside from the obvious advantage in being proof against breakage—an important factor both in shipping and in service—it is said to cost less than glass, is easily kept clean, and will not rust. The metal is manufac- tured in a variety of shapes. MECHANICS ANIMAL LIFE OF AUSTRALIA PRESERVED IN MUSEUM To provide for the future study of the country’s disappearing wild animal life a national museum has been established at Canberra, Australia, in which will be kept specimens of native species displayed their natural surroundings. With tl! advance of civilization and increase domestic animals, the unique wild life h been greatly deplete Although man private collections hfi¥ been donated the new institution, j believed the gat! ering of most of th@ rafer specimens wil be a difficult task oping to their scarcit SPOTLIGHT ON CAR FRONT TURNS BY LEVER AT STEERING POST An automobile spotlight with the switc! and control on the steering column move at a touch and can be turned in any dire: tion by the driver without changing posi tion. As the lamp itself is placed low o: the front of the hood, it cannot obstru the motorist’s view of the road and quires no piercing of the windshield marring of the frame for installation The rays of the light are below the li: of sight of approaching traffic, reducing risks of night accidents often resultin from. blinding glare. Although easil swung about, the lamp cannot be jarre from its position after the rays have bee once fixed in any direction. Spotlight Worked from Steer- ing Post of Auto, Rays to Avoid Blinding On- coming Driver; struction of Control Lever on Post, and Right, How Light Is Placed at Front of Car Casting Left, Con-

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POPULAR MECHANICS 929 . GEOLOGISTS SERVE AS SCOUTS LIFE-SAVING SUIT WARMS BODY IN RAILWAY DEVELOPMENT ogists often prove as important to Acting as oad as the engineers. they examine de- of ore. oil and resources, and ex- re mountains and rnesses, using pack to take them far d beaten trails. that they gather erning the land are on to the road’s ts, who use the in- ion to induce in- es to locate along ine. When a rail- is asked to an extension, word its geologist may le the matter, as his ey tells if the new rich enough irrant development ong ago, a railway ts geologists to ex- plans or tory 1s some deposits of m heir analysis ed that the area held 1.000 tons of the ma |. A plant was built, it is expected to be a lucer of railroad traf- or several years to e. Studies of the ber supply and of water problems in | regions also are made by these scien- ts, who save the companies thousands dollars annually and eliminate much of speculation as to reasonable returns m new lines. WHEN SET OFF BY HEAT Wired to the doorbell, a fire-alarm at- iment for the protection of the home, ngs the signal automatically when the mperature certain nt. It operates ymewhat the e principle as overhead nkler devices extinguishing being ex- ely sensitive certain to function. ntly and keeps ringing until the tem ture falls or the alarm is cut off. he >» a The bell is rung AND HAS WATER-TIGHT CAP Persons are said to be able to remain in ice-cold water several hours without dis- Demonstrating Life-Saving Suit That Acts as Float and Keeps Wearer Warm; Hood Can Be Drawn over Head Wh Needed comfort in a life-preserving suit that has a hood arrangement fitting tightly over the head and shoulders and heavy mittens for the hands. It is declared to be so well in- sulated that the heat of a wearing it is retained and no moisture can seep in. The arms and legs can be used while wearing the garment, and the head covering may be adjusted for better pro tection against high extremely cold weather. body person waves or MONUMENT TO HONOR BURRO Members of a Colorado mining associn tion have decided to erect a bronze monument to the burro in recog nition of the help the animal has given in the development of the west. Although the butt of jests and sometimes the vi tim of ill-treatment, the burro’s good qual ities, dependability, strength and ance, long have been appreciated by pio prospectors and adventurers who have been seeking fame and fortune oft the beaten trails. stone o1 endut nee;rs,

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Dynamite Blast in the Desert Unearths “& Setting Off One of the Blasts Which Ripped Open the Barren Hillsides to Uncover the Secrets of Life That Existed Millions of Years Ago near the Mohave Desert By C. W. MACFARLANE I ID you know that camels originated in North America? And that the only representative now existing on this hemis- phere of this once vast tribe is the llama of South America ? Or that the now dry and arid Mohave desert was once a verdant plain? And that, from five to eight million years ago, giraffe - camels, three-toed horses, and other totally extinct creatures cropped its grass and herbage in untold numbers? An expedition, composed of Los An- geles scientists, accompanied by the writer and a motion-picture cameraman pene- trated the desert fastnesses of the barren Mohave and brought back an answer to the questions propounded above. Organized and headed by Dr. A. J. Tieje, widely known paleontologist, the expedi- tion succeeded in bringing back the bones of animals, which, according to scientific estimate, lived from five to eight million years ago, and that may have perished in an ancient volcanic catastrophe. In appearance the fossil-bed area is as fantastic and as odd an earth formation as you will ever see. Whole slices of moun- tainsides have been pushed up in steplike layers. Here are hundreds of little mounds like chicken croquettes on a huge platter. There are lofty towers pattern- 930 ing their jagged silhouettes against desert sky. Whole castles and cathed: stand forth in bold relief, and ming with these are hundreds of lesser for: tions whose contorted and _ irregu! shapes defy description. It is weird a: seems of another world. But, forsal and desolate as it is, this lonely reg carries a record of life now vanished fr the earth that is fascinating and alm overwhelming. Diligent search soon revealed the pr ence of hundreds of very much broken v pieces of fossilized bones, some of th: showing the marrow channel, and oth: parts of the rounded ends of joints. M of the specimens were found lying on t surface, exposed by the rains which h washed away the ashen blanket that | covered them for so many millions years. With the profusion of so ma fragmentary specimens, it seemed lik: that underneath lay other more comple: remains, and, acting upon Dr. Tieje’s su gestion that a small charge of dynam might uncover a skull, drilling was start preparatory to placing the dynamite. Now, to be told that a bone, or anyth else for that matter, is from five to eig million years old, and to be asked to | lieve it, is a rather large order; therefo POPULAR MECHANICS

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rs Animal Bones Five Million Years Old scene of the Expedition’s First Fossil Find Which Resulted in the Determination to Shatter the Surrounding perhaps well to add a few enlightening rks concerning the composition of fossil-bed area. Scientific scrutiny tablished the material into which our ls were now punching to be principally iicanic ash, laid down apparently in what cientist would term the Upper Miocene ene designates the ldle period since » beginning of the mammals. uthorities differ, it this period is ually placed at ut five to eight ion years ago. the back of the age of mmals lies the ” ve of reptiles, who, ; rding to the scientific Ss close of re of + i °.6 thorities, ruled ’ e entire earth, , id, sea, and air, ; a period of ap- w } ximately thirty lions of years. is was the age of ing : ; ty 4 e gigantic carniv- " us Tyranno- . ™ - . B urus, which & od. In the geologic calendar, Upper Fossil Fragments Torn from the Earth That Reveal Secrets of a Little Known Era POPULAR MECHANICS Soil with Dynamite in Search of Additional Specimens of Prehistoric Bones reacheda length of forty-seven feet or more, and was eighteen to twenty feet high Back of the reptiles was the age of fishes and back of that the age of invertebrates From this reckoning, some idea can be gained of the antiquity of the fossil bed With the dynamite placed, the fuse lit, a muffled roar reverberated sharply from the torn stratified walls which rose around us and struck an answer- ing note in the beat ings of our hearts as we ran to comb the cavernous hole made by the blast No skulls were uncovered, but tron the shattered gray ash we rescued part of the thigh which was identified as belonging t« Alticamelus, a high necked camel, and portions of the foreleg of the sam animal, and in sort ing, found the tooth of Merychippus, a three - toed ing horse, bone brow > It was a 931 933

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932 POPULAR MECHANICS fortunate find, for strange as it may ap- pear, scientists tell us that the camel tribe originated in North America and was long confined to that continent, while at the present day this once vast tribe is repre- sented only by the llamas of South Amer- ica and the true camels of Asia, having completely vanished from its former home. With the Mo, ie Camera, the Explor. ing Party Recorded the Story of a Hand. ful of Fossil Bc nes Thousands of Cen. turies Old When this animal roamed, the now d: and arid Mohave desert had considera! grass and herbage, with frequent wate: holes, much the same as certain parts Africa, and for unknown distances th country was low, open and rolling. Th present desolation has been due to soni volcanic upheaval. WATER MAINS MADE ON SPOT CUT CONSTRUCTION COSTS Combination steel and concrete water mains can be made on the spot in a tem- porary works by a new system in use in England. The skeletons of the tubes consist of metal strength- ened, inside and out, by spiral bars which retain the concrete body. These frames are rolled from ready-cut material as needed, eliminating any waste of raw products. By 934 POPULAR molding the pipe as it is laid, losses resu ing from left-over supplies are greatly 1 duced since only sufficient lengths are c: to finish out a line. After the sections ar constructed they are heat-dried and left | “season” in the open air for about t days. The method does away with t cost of transporting the pipe. Joints the sections are welded and sealed by t acetylene torch, forming a tube which reported to be capable of withstandin: high water pressures. @ After severe volcanic eruptions, t!: earth’s temperature is said to be reduc: for long periods because of the floati dust that is sent to high altitudes, inte cepting the sun’s heat. MECHANICS A

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POPULAR MECHANICS 933 COUNTRY’S AUTOS WILL SEAT SEVENTY MILLION PERSONS tor cars and busses in this country, it mated, have a seating capacity of at t 70,000,000 persons, about three times iny as can be carried on all the rail- dcars. About two-thirds of the popu- in could ride at one time at thirty miles our on hard-surfaced coast-to-coast ls, and there are about 2,500,000 miles ther roads suitable for auto traffic. AUTOMATIC CAFE SERVES FOOD WITHOUT USE OF COINS Ouick service for restaurant patrons . been a fact for some time both in cafe- terias and coin-in-the-slot places where lishes are kept in sanitary, glass-front mpartments until purchased. But the bother of handling money and waiting in ne in front-of steam tables, where food ten is long exposed, are common objec- ms. These, and other shortcomings i such eating places, are said to be elim- ited in a restaurant that combines the principles of the usual cafeteria and auto- itic lunch counter. As in other shops, foods are kept in separate, covered hold- but to get them, all the customer has » do is to insert a card in a slot. This perforations at the top that automati- release the lock, and at the same ime the price of the article is stamped a column. When the dish is with- rawn, a light flashes in the compartment, orming an attendant behind that the ice needs refilling. When he has gath- red what he wants, the patron pays the | Compartments and Slotted Card That Is Stamped with Price as It Unlocks Them hier the total of the sums shown in the 1mns of his card. This self-service ii has fifty-three patented features. NEW KEYBOARD ON ACCORDION SIMPLIFIES PLAYING A violin-accordion, differing from the usual instrument in that its left-hand keys are operated in the same way that finger- Easily Played Accordion with Four Rows of Left-Hand Keys for the Melody Part ing is done on string pieces, has been pat- ented by a Kansas musician. Knowledge of the piano keyboard is not essential, and anyone familiar with the violin, mandolin, banjo or cello, it is said, can play this ac- cordion after but little practice. Bass parts are fingered with the right hand on the usual arrangement of stops, but can be learned easily, as the melody is carried by the leit on four vertical rows of keys corresponding to the four strings on other instruments. TUBERCULOSIS SOON TO VANISH BRITISH DOCTOR SAYS Twenty-five years from now, tubercu- losis will be as uncommon in the British dominions as leprosy is today, according to Dr. C. W. Saleeby, of the London medical institute. He also predicts that infant mortality will be reduced to almost nothing and that successful ways will be discovered to combat cancer. Largely through preventive methods, the death rate trom tuberculosis has steadily de- creased in the United States. In 1910, the fatalities from this affliction of the lungs were nearly 140 for each 100,000 popula tion and in 1922, less than one hundred. POPULAR MECHANICS 935

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POPULAR MECHANICS Inside the Passenger Car of Trans-Channel Airplane in Use between France and England; above the Window Are the Life-Belt Holders with Release Straps within Easy Reach PLUG IN BATTERY LIGHTS LAMP TO SHOW DANGER HEAT A plug that registers the danger heat of automobile storage batteries has been made to light a warning lamp on the in- strument board, indicating overcharging, “shorts,” low water and other imperfect conditions and injuries. The plug is eas- ily attached, and only one is required for all three cells. Since damage to practically any part of a battery will cause it to heat, the high temperature in the cells affects strips of delicate metal in the tube result- E Close View of Plug and Tube, and Their Appearance Installed in Storage Battery ing in the closing of the electric circuit connected to the lamp. 936 LIFE BELTS CARRIED IN PLANE TO REDUCE JOURNEY HAZARDS In addition to comfortable seats and roomy car for passengers on an airpla that makes regular trips across the En; lish channel, life belts have been provide for the safety of the occupants. They are within easy reach and can be put on quick ly in case the machine should meet with a: accident while passing over the wate: The windows of the craft are made e ceptionally broad to permit easy escape. UNDERTOW IS CALLED MYTH Undertow, much feared at bathing beaches, is a myth, according to Dr. \\ M. Davis, of Harvard university. ‘ course, he says, there is a return mov: ment of water after each wave, but it reversed by every succeeding wave. \ genuine undertow, that is, a strong botto: current setting permanently away fro: shore, he holds, can arise only under pec liar circumstances. A deep “pocket beach between two headlands will devel a steady bottom current when a wi blows in from the sea. POPULAR MECHANICS

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POPULAR MECHANICS FAN-TAIL PADDLE WHEELS GIVE BOATS MORE POWER Jlow-draft vessels equipped with a series of six paddle wheels set fanwise at tern, develop greater power than de-wheel types according to German tests. This method, known as the Lloyd tem, is said to overcome many of the culties presented by the limited widths uch craft at the beam. The arrange- t, which seems to be especially adapt- ei to towing vessels, has been applied to designed for service on the Rhine, in increase of twenty-five per cent of ing power over that of the ordinary le-wheeler was shown in tank tests. MAN PAID TO WATCH CHIMNEYS TO PREVENT SMOKE \\ henever one of the 265-foot chimneys n eastern power plant emits thick, smoke, a big gong clatters and the en in charge run to their boilers to irrect the nuisance. The warning signal ent in by the chimney watcher who sits a little coop in the yard where he can mmand a clear view of the flue tops. \. soon as he detects too dense a cloud, e throws a switch that rings the gong. here are three eight-hour shifts of watch- rs each twenty-four hours. HOLDER FOR PAPER BAGS SAVES SPACE AND CLERKS’ TIME \ holder for paper bags, designed for roceries and similar stores, keeps the cks out of the way, but convenient to the reach of clerks when needed. The hanger can accommodate many different- sized bags, which are released by a slight jerk from the worker's hand. Besides keeping the articles clean and dry, the hold- er avoids waste of the sacks, which are often damaged or badly soiled when deposited on counters or Several thousand bags can be pended on the rack, which is easily in- illed and may be folded up for shipping. e device is patented. } elves. POPULAR MECHANICS 935 CAMERA STAND FOR LOFTY VIEW FOLDS INTO SMALL PACK A camera tripod which can be extended to several times the height of ordinary i Lofty Photographers’ Tripod Which Elevates Camera above Obstructions When Taking Pictures stands is being employed by a Cincinnati photographer to take pictures of tall build- ings. The attachment enables the ope: ator to get the “shots” over the heads of pedestrians, avoiding interruptions caused by passers-by obstructing the field of the lens when photographing from the street level. Large structures may also be it cluded in the lens with more detailed effect with the tripod, as it brings the camera in better line with its object. To work the camera after it is set up on the lofty stand, the operator uses an extra-high steplad der. On thoroughtares where trolley and light wires are strung, the arrangement elevates the lens above such obstructions. @ Of the 20,000 persons killed in automo- bile accidents in the United States last year, thirty-two per cent were children under fifteen years old. 937

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936 WRENCH WITH SOCKET IN HEAD HAS RATCHET HANDLE With a ratchet of head and a be turned in a form can socket handle that Ratchet Wrench Needs No Re- adjustment after Socket Is Slipped over Nut wrench direction, a now on the market is said to permit reach- ing and turning nuts in difficult places and is not likely to slip off when once adjusted. The socket stays in place until the opera- tion is finished, thus eliminating the need for fitting it repeatedly to the nut to geta forward or reverse new grip. The long handle gives ample leverage and by turning a pawl close to the socket, the motion can be reversed. ENGINE COST IS CUT IN HALF BY USE OF HIGH PRESSURE An engine driven by steam generated at a pressure of 3,200 pounds to the square inch, or 218 times the ordinary atmos- pheric pressure, has been safely operated at Rugby, Eng., for six months. Water is heated to over 700 degrees Fahrenheit un- der this pressure and is then turned into steam without any extra heat. If water is heated in an ordinary boiler to near the boiling point, a large amount of extra heat is required to turn it into steam. It is this additional heat, known as the latent heat of vaporization, which is so costly an item in the fuel used in steam engines. Water heated under sufficient pressure, rises to what is called the critical point, POPULAR MECHANICS and it will then turn into steam with prac- tically no extra heat. At the critical teim- perature and pressure, a gallon of water will be converted into only a gallon of steam, the high-pressure steam only occu pying the same space as the water. Thy engine is capable of 1,500 horsepower, and is said to save half the fuel and one-th the boiler space required by ordinary types. The extremely high pressure of the steam is first reduced to a point suit able for operating a specially designed turbine, and then is again decreased for driving a lower-pressure turbine. WHERE ALL MILK GOES SHOWN BY GOVERNMENT FIGURES Out of every dollar spent for food about twenty cents goes for dairy pri ucts, according to the departmént of ; riculture. It is estimated that every px son in the country drinks an average fifty gallons a year, an increase of about eight gallons over 1917. The per capit consumption of butter is also said to hy increasing. It was nearly 16.5 pounds | year and only 14.6 pounds in 1918. Ab: one fourth of the yearly milk supply made into butter. Less than four cent of the milk goes into cheese about three and one half per cent for c densed milk, the use of which is growing — POWDERED CREAM 002%. POWDERED MILK MILK 098%. CHOCOLATE CONDENSED & \)'y MILK WASTED a aa Almost as Much Milk Is Wasted as Goes into Ik Cream, This Chart Shows 38 POPULAR MECHANICS

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POPULAR MECHANICS 937 Striking Patterns Ex- pressed by the Weaver of Cloth Are First Arranged by an Artist from Combinations of Vari- ous Shades and Designs Tests by Government Experts Point Way to Longer and More Useful Life for Fabrics - it true, as housewives sometimes assert, that clothing and household abrics now being manufactured are of poorer quality than those made before the ar? That tablecloths, sheets, towels, and other linens do not last as long as iormerly? That portieres, upholstery, rugs, curtains and other textiles used in the home must be replaced more fre- quently ? A series of interesting mechanical tests to determine these facts are now being made by government textile experts at the ureau of standards. The tests contem- plate, in addition, the preparation of pecifications for fabrics that will stand arder wear. lt has been found, for example, that it is ossible to use reworked wool and produce tabric which is superior in wearing qual- ities to One containing all virgin wool. It as been shown that very often the kind of fiber used in fabrics is less important for ertain uses than the closeness of the weave. In testing the goods, the experts make allowance for the fact that wearing ap- parel and house furnishings receive harde wear nowadays than in grandmother's time. Parlors, for example, once held sacred to be opened only on rare occa- sions, are now used by the entire family, with resultant heavier wear on rugs and upholstery. The modern housewife changes the bed sheets and towels more frequently, and uses the napery more often. Motoring and other outdoor ac- tivities, naturally, are a tremendous strain on clothing. The tests consider the whole problem of fabrics from the production of the raw fibers in the cotton fields and on the sheep ranches, through the gin, the spinning of the yarn, and the manufacture of the cloth. They are made in a special labor- atory insulated with cork so that atmos- pheric conditions of temperature and humidity may be artificially regulated and hence, each test will be made under identical conditions. One of the testing machines is an abra- sion device which rubs two pieces of POPULAR MECHANICS 939

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938 POPULAR MECHANICS Blankets Are Tested for Their Efficiency as Com- fort Producers and Health Protectors on This Electric Device Which Measures Heat Retained by the Cloth and the Amount of Air That Escapes through the Fabric; Right, Wool Fibers Magnified 500 Times by Textile Ex- perts in an Effort to Determine the Strength Below Is Shown a Attendant in a Wea ing Factory Measurin; the Width of the Ws of Patterned Cloth as I \ Passes through the Ma 5 catia 1 eee \\\ chine; Left, Preparing AT en , rr TY fs Vg REST mid? 4 FRE \ Finished Cotton Mate Where Designs Are Ap I| it Sate i = one plied by Printing Ther \ peter ot Te sga¥ *g a, % - W trom Engraved Rolls o \ ey ud Ga "| Metal or Wood Coat \ | with Dyes That Can B and Structure of Raw \\\ gue : }] Worked Together wit! Materials from Which \ * waren ; Pov seal be 4 war let, // out Mixing or Running Our Clothing Is Made we LE av v7 » 7 RA. ae de th yj irto Each Other Ves TESS | ~ wee Ss \ a: * ao rial on a Huge Press 910 POPULAR MECHANICS

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J POPULAR MECHANICS Where the Standards of Cotton Fabrics Are Set by Textile Experts of the Agri- cultural Bureau, Who Keep an Ac- curate Record of Their Findings; Left, Registering the Pull Required to Break a Strand of Cotton Fiber; Be- low, Left, Instru- ment That Tests the Twist of Wool and Cotton Threads, and Right, Determining the Resistance Sheets tc Rips of and r POPULAR MECHANICS Tears 941

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910 until they are worn through. The pressure is adjusted to ap- proximate actual wearing conditions. Such a test recently made for the army developed a commercial cloth that, when used in trousers, would enable the wearer to sit down 97,000 times before the cloth was worn through. Another device measures the taining properties of fabrics. This consists of a square metal plate, electrically heated, and provided with means for measuring its temperature and the amount of elec- tricity required to keep it at the tempera- ture of the test. Samples of the fabric are clamped down on both sides of the plate so that no heat can escape except through the fabric. The escaping heat is measured electrically, because the conversion of electricity into heat is made without loss. \ test of blankets in this device devel- oped the information that those of mod- erate density are most effective for re- taining heat when not exposed to.air cur- rents, but that heavyweight blankets are more effective in keeping out the wind. Wind permeability tests are made by fastening a sample of the fabric over the open mouth of a cylinder into which air is pumped at low pressure, a gas meter being used to measure the amount of air escaping in a given time. Resistance to moisture is determined by tying samples over small glass beakers containing water. The beakers are weighed at intervals and fabric together heat-re- 942 POPULAR POPULAR MECHANICS the loss of moisture noted. The test that increased thickness of fabric give a proportionate increase in resistance to heat flow. Resistance to the passage ot air currents increases with the closene of the weave, and hence with the density Resistance to the escape of moisture also increases with the density. Comparing cotton blankets with woolen the bureau found no significant difference in the heat resistance or in the resistance to passage of air or moisture. Cottor blankets, however, are apt to be stiffe: than wool and fit less closely around the neck. They also have the undesirable property of absorbing moisture, wherea wool repels moisture. On the other hand cotton blankets are much cheaper tha: wool and can be used to good advantage indoors with sheets. The advantages o wool are most pronounced for camping The investigations of production met] ods in the field show have led to a campaig among cotton growers to protect thei baled cotton from weather damage. Dam age of as much as 370 pounds of cotton i: a 500-pound bale has been found by the experts where cotton has been expose over a period of several months. The dam age is caused mostly by absorption o water from the ground rather than frot rain falling on the bale, and the govern ment is urging producers to keep thet cotton off the ground on boards and to cover the bales with tarpaulin. Effects of Damp Weather on Your Clothes Shown by This Device, Which Weighs the Moisture through Fabrics Passing MECHANICS

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POPULAR MECHANICS 941 - % Inspectors Examining Samples of Raw Cotton Collected from Shipments of Material Pro- duced by Plantations of This Country; Careful Study Is Made of Moisture and Damage Sustained in Transportation X = a ———— 4 * F ! 4 z 4, j vy , ae . ¢ Printing Department of a Cotton-Fabric Mill Where Miles of White Cloth Are Covered P> with Brilliantly Colored Patterns as It Races through the Rolls of Machines Which Turn — Out Thousands of Bolts a Day POPULAR MECHANICS 943

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942 POPULAR + Sai oa: Ow - ee, B, Headlight MECHANICS Running-Board Lamps Installed, a on Right and the Lei: One Casting Glow to Rear; Inset AMPLIFIER - CONTROL SWITCH REPLACES PLUGS AND JACKS An all-purpose switch that can be mounted on the receiver panel, and elimi- nates the use of plugs and jacks for con- trolling the various am- plifying stages in the modern multi- tube receiver is now avail- able. The am- plifying units of the receiv- er are brought into action by simply turn- Bakelite cams on the shaft ing the knob. are arranged to make and break the cir- cuits as the knob is turned, and a fan- shaped switch blade, mounted on the shaft at the rear, makes and breaks the filament circuits to the tubes, so that only those required for the stage used are lighted. @ Names and addresses of manufacturers of articles described in this magazine will be furnished free by our Bureau of Infor- mation. 944 Gives Close View of Lamp POPULAR MECHANICS LAMPS ON RUNNING BOARDS ELIMINATE GLARE By placing auto lamps on the running boards and directing the one on the right hand side forward and the left one to the rear, an effective way of eliminating the glare from the usual headlights and 0! aiding the driver has been devised. Ap proaching autoists are protected from the full rays of the right lamp by the front fender but ample illumination is throw: upon the road where it is most needed The left light, shining behind, is to be used only when on the highway or on dar! streets, affords a useful tailpiece and help in backing. The lamps are not difficult t install and serve as brilliant step light in entering or getting out of the car. PLANTING FLOWERS BEES LIKE INCREASES HONEY YIELD Experiments conducted by an Englis! bee expert go to show that by catering to the insects, or planting the flowers the. prefer, the honey yield may be increased as much as twenty per cent. Apart fron clover, bees show a preference for cut rants, loganberries and gooseberries, fol lowed by the sycamore and the raspberry Most bell-shaped flowers are also attrac

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POPULAR MECHANICS e and provide abundant honey sources, ile mignonette has been found to at- act bees for more than a mile from their ives, and the common hollyhock even irther. It is asserted that by planting ose flowers most preferred by bees as ear the hives as possible, the time spent n traveling to and fro is given to the stor- ig of larger quantities of honey, and the erry yield is increased through more effi- ent fertilization as the bees serve as dis- ributors of the pollen. BIG TANK IS SAFETY VALVE AGAINST FLOODS \s a safety valve to guard against heavy ressures and floods caused by thaws or reaks in dams, a hydroelectric power mpany’s water line in the Sierra Nevada ountains has a huge tank constructed at e top of a 265-foot tower. Any greatly nereased flow which reaches a point of danger to the system causes the water to urge up in the tank and run out over the des, thus relieving the strain on the tructures below. The water is conveyed by gravity to the power plant through twenty-six miles of pipe and canals from uurces high up in the mountains and this makes necessary the unusual height of the Huge Tank Serves as a Safety Valve for Water Line during Pressures and Floods tank. From the base of the safety valve there is a drop of 1,900 feet to the giant turbines. POPULAR MECHANICS 943 HOBBY-HORSE CHAIR ON SPRINGS KEPT CROMWELL IN TRAINING One of the reasons for Oliver Crom- well’s fame is the fact that he successfully Baldwin Seated Used to Keep Fit for Cavalry Duty Premier in Spring Chair Cromwell developed the cavalry units of his army to a high degree of efficiency, demonstrating the value of horses in many battles. An interesting sidelight on this phase of his career has attracted attention recently in a curious armchair with a seat resting on high springs extending above the bottom frame. When home from campaigns and too busy to take regular exercise on his mount, Cromwell is said to have exercised in this chair, bouncing up and down for a short period each day to keep himself ac- customed to the motions of horseback rid- ing. The relic is now in the possession of Premier Baldwin of England and was demonstrated by him when friends visited him at his residence. NAILS ARE GIVEN BETTER HOLD BY SPIRAL GROOVES Packing cases coming from Europe have been found fastened together with ten- penny nails that have spiral flutes in the sides to afford a better grip on the wood. The grooves also decrease the likelihood of splitting the boards and help in driving the nail straight. 945

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944 POPULAR MECHANICS Top of Etevator Shaft with Recciving Box into Which Salmon Are Dumped before Being Released into the River Again Elevators Save Lives of Salmon yLEVAT ORS to lit fish over the tall — hydroelectric dams in the far west have been tried out successfully on the White Salmon river in Washington, and as a result they will be ordered by the state for all dams which are too high for steelheads have negotiated ladders. The elevator, developed by Prof. Joh N. Cobb, of the University of Washingto promises to solve the difficulty of getting the fish to the spawning beds upstrean seventy-foot the fish to It is a simple scale by the wire-mesh bas usual fish lad- ket, traveling der. A fish up an incline ladder is a se- hoist, with ar ries of shallow electric motor pools, arranged in step forma- tion, and with a small amount of water di- verted to them at the top of the dam. The fish flop into the lowest pool, and then by successive jumps rise from step to step until they top the dam. Average salm- on, however, will not climb to operate it aad an attend ant in charge A “waiting room” is pro vided for the fish at the foot of the dam, 1: the form of a large woode! tank, anchored near the shore with its top edgea foot above the rive: surface. Water is diverted into the tank, to spill over the more than thir- ty teet, though Fish Ladder, in Foreground, on San Clemente Dam edge. The ap pearance, to the

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=] ee =” POPULAR MECHANICS 945 Elevator Hoist and Basket on the White Salmon River, with the Corral for Gathering Fish Below; Inset Shows Basket Leaving Fishway Box

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946 POPULAR MECHANICS fish, is much like the usual lowest pool of a fish ladder, and the salmon, when they find they cannot negotiate the surface of the dam, jump into the box. When a suf- ficient number of “passengers” has entered the elevator, the attendant lowers the cage down rails into the bottom of the box, lets it rest a moment, and then raises it, scooping up all the fish in its passage. The experiments already made have dis- closed that the fish can be lifted over the dam without injury, although the cage holds no water. While the fish elevator is more expen- sive than the ladder, requiring electricity and an attendant to operate it, the invest- ment is expected to prove worth while. SHIELDS PROTECT LINEMEN FROM CHARGED WIRES Danger from electric shocks which menace linemen engaged in a maze of Linemen Guarded by Shields against Contact with Wires While Repairing Broken Electric Cables charged cables at the top of transmission poles, is considerably lessened through the use of special shields that fit over the wires for a distance of several feet. Con- structed of heavy insulating material, the sleevelike guards can be quickly clampe on the cable and insulators, and protect the men from contact with electrified sur- faces among which they work, eliminat- ing the need of cutting off the power until the tasks are finished. Shields are « made in shapes to conform with the cross- arms of the poles, for use in cases where the pieces are covered with ice or water and likely to be charged with current Equipped with the shields, electricians are free to move about with greater ease and can work with greater efficiency. DAM BUILT ONLY TO BE BURST AS TEST OF CONSTRUCTION An experimental dam costing many thousands of dollars is to be built and then immediately destroyed to test the latest engineering theories in relation to the constant-angle arch type of construction. The experiment, made in connection with an tended expenditure of $35,000,000 for a flood- control system in C fornia, is expected to prove the value of thin- ner arch construction than has been tried in | past. The dam will 140 feet long and sixty feet high, when the first tests are made with spe- cial instruments installed in the concrete to meas- ure stresses, deflectio: and temperature chang: as the volume of wate: increased. After su data have been obtain: the height of the arch will be extended to 100 feet, and t water permitted to rise to a sta where the wall may be forced fr: , its position, in order to obtain i formation as to the maximum lo this type of arch construction c: withstand. SUN TO THROW OUT MORE HEAT AS SPOTS INCREASE Measurement of the sun’s heat sin 1920 show that for over two years it | been below normal, according to C. ‘ Abbott, of the Smithsonian Institutio who says it is now reaching normal aga Comparison of the number of sun sp: gives the reason. During periods wh:

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POPULAR there are few spots, the 1et seems to burn low, lar to a fire which is unattended, but with erowth in the num- of sun spots more ir heat is radiated, as eh the embers were tirred. Two observation tations are carrying on - work of studying the ibiect for the entire world. One is located on the arid heights of Ari- na and the other at the mmit of a desert mountain in Chile, 9,500 feet above sea level. Daily reports of their findings are sent by tele- graph to headquarters. MAGNETIC SQUARE AIDS DRAWING Holding the T-square in an accurate position has been simplified by a magnetic steel head for the instrument, the in- vention of an English en- gineer. Strips of stainless iron on the edges of the drawing board attract the magnet with sufficient strength to keep the square from falling off even if the board is held in a vertical position, but the draftsmen can shift the rule with little trouble. Sloping lines are drawn without removing the head simply by loosening a locknut that permits the arm to be swung to any angle desired and the lower edge of the square is shaped to allow it to pass over the heads of drawing pins or other obstructions without jerks. E SQUARE mame DRAWING —— BOARD | oe l-Square Is Held to Drawing Board Edge with Mag- net and Has Swinging Arm MECHANICS 947 Architect's Drawing of Front of Combination Building and Diagram of Garage Section to Show Spiral Auto Ramps and Elevator OFFICE BUILDING WITH GARAGE TO SAVE PARKING SPACE A thirteen-story combination office and garage building that will hold 1,200 cars is proposed for a Pacific coast city as a solution of the tenants’ parking problem. Machines are to be stored in a separate section on each floor, entering and leav- ing on ramps extending from the second basement to the top. They are arranged in a compound spiral fashion, sixty feet in diameter with a twelve-per-cent grade. One runway is for incoming and the other for outgoing cars. A single circle on the spiral takes a car up two stories. A freight elevator between the ramps is pro- vided for drivers who do not wish to use the spirals. The building will have 150 offices besides stores and other rooms, and the section devoted to ramps can be con- verted to other purposes with little re- modeling. Concrete and steel construc- tion safeguards against fires. The drive- ways are banked at the turns and have non-skid floors for added safety. The plan is expected to relieve traffic confusion and prolong the life of cars.

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948 PATCH ARTIST SEWS POSTER ADS FROM COLORED RAGS Needle and thread serve the purpose of brushes in the hands of a poster artist who Copyright, Keystone View Co. Patch Artist Stitching a Cloth Poster Ad from Bits of Fabric That Make the Picture Look Real forms attractive designs with patches of colored cloth. Each piece of material is of proper shade and shaped to fit neatly in place on the figures. Where special cuts of wearing apparel are to be displayed, the entire garment is stitched into the design, presenting a realistic effect. By using the same fabrics in the signs as are made up into garments, the artist is able to por- tray a gown or suit almost exactly as it would appear on the wearer. In addition to saving window and. show-room space, the process does away with the need of elaborate wax figures which represent a great expense to merchants. Materials can be used repeatedly, since the posters may be taken apart and re-formed into other designs as styles and seasons change. AUTO WITH TWO FRONT ENDS FACES BOTH WAYS For the purpose of advertising his busi- ness, an Oregon automobile dealer built a car with a false hood, driver’s seat and steering post to replace the rear end, giv- ing the machine the appearance of facing in both directions. As the substitute structure is an exact duplicate of the orig- POPULAR MECHANICS inal front, the machine attracts much at- tention as it speeds grotesquely along the streets or is drawn up at the curb. The strange car is employed by the owner in the routine of his business, and the false front can be used to carry tools and other service equipment. PLATINUM FOUND IN AFRICA COVERS LARGE TRACT Extensive deposits of platinum discoy- ered in the Transvaal districts over a tract of land sixty to a hundred miles in lengt have been described by Drs. P. A. Wagner and E. T. Mellor, of South Africa, w! state that the conditions under which the metal was discovered are similar to those occurring in Colombia and the Ural mou: tains, from where the world received ninety- five per cent of its supp! of the mineral before the Great War. The plat num is said to exist in two well-defined strata, among material rich in iron, and in deposits washed out of such soils by the action of water A little more than a dec- ade ago, the combined production of platinum in the world amounted to over 300,000 ounces annually, but in the past few years has dwindled to about on sixth that volume, owing mainly to re- duced output from the Russian source. TRAPDOOR INSIDE MAIL BOXES TO PREVENT THEFT To make mail boxes secure against theft, an English inventor has devised a trap- inside the door arrangement that fits holder to prevent taking letters from the slot. When the mail is put in, the top flap auto- matically closes the trap, which is above the bottom of the box. But as soon as the flap is released, the lower door falls back, allowing the mail to drop into the main compart- ment where it can be reached only by unlocking the box.

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o — — a aa Oa Ss == POPULAR MECHANICS i) -) By WILLIAM ULLMAN Wwits air cleaners, straight-eight mo- YY tors, four-wheel brakes, balloon tires nd many other improvements coming in- to wide use on our modern automobiles, the average motorist is beginning to find the answer to the oft-repeated question, Vhat next?” lhe next great improvement, according those who have paid the penalty for retarding its progress, is intelligent use of of the new features as well as of those hich have become such integral parts of the average automobile as to be consist- ently abused and neglected. Improve- ments in driving, motorists are finding, | do more to cut operating costs, etter performance and increase safety han any half dozen new inventions that ight be added to the present motor car. With a little co-operation from its opera- tor, any car can reach new levels of abil- ty and usefulness. There have been two stumbling blocks to progress in this direction. In the first place, bad habits in driving grow on one 0 rapidly that a very destructive driver yon reaches the point where he resents lvice. And, in the second place, the new improvements in cars along mechanical nes have been such as to lead the driver to believe that the modern car almost uns itself. Perhaps nothing illustrates both points etter than the situation with respect to clutch. Ever since the first repair in began to prosper, drivers have been iring out rear ends because of their ibit of letting in the clutch suddenly Vhen they were criticized for this brand abuse, they argued that the rough ac- on of the cone type of clutch rendered smooth starting exceedingly difficult, if not impossible, with many cars. But now that the disk and plate types have become practically universal in America, the average car owner goes right on letting in the clutch carelessly. Instead of tear- ing out the rear end, however, he is wreck- ing the clutch. ’ The average car today is capable of run- ning at from two to sixty miles an hour in high gear. The engines, being of the light, high-speed type, will not stall until the brakes are actually set. They will accelerate without nursing. This means that, for the bulk of one’s driving, nine- tenths of the results desried under any conditions can be obtained by wise use of the accelerator and the service brake pedal. Riding the clutch and frequent dis engagement of this unit are relics of the old days when slow-speed, heavy engines would not throttle down without stalling, nor give anything approximating flexi- bility without slipping the clutch. Improvements in driving, like improve- ments in the automobile itself, await sim- plicity. Set the hand throttle to a position that will provide enough gas for the mini mum speed in high, and then use the ac- celerator for your speed variations. Just taking the foot off the accelerator will serve as a brake, for the car will then have to drive the engine, and that serves to kill momentum. A dab of the brake pedal will serve for a more definite slowing down of the car, while a little forethought in study- ing the trattic conditions will often make a complete stop unnecessary, thus saving the car the sort of work that future results. Many cars “buck” when the driver's sacrifices

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> POPULAR MECHANICS of an obstacle to quick starting today as it ever was. This is the habit of switching on the ignition before steppi: on the starter. The chief function of the starter is to create enough suctio: in the intake manifold, through action of the pistons, to cause a healthy spray raw gasoline from the carburetor jet, a1 to create as high a compression of what ever gas forms as is possible under th adverse circumstances. The quicker t! starter spins over the engine, therefor: the more favorable conditions will b: for starting. To assure the starter every assistance is only logical to permit it to drain all t! current it needs from the storage batte: That is why the first step in cranking ; cold engine should be done with theligh: and ignition off and the clutch out. Aite: the engine ha been turned ov: a few times, the switch on the i To Start, Push In Clutch, Press Starter and Then Switch On Ignition foot is removed from the accelerator merely because the hand throttle set for too little gas. Much of the natural braking power of the engine is sacri- ficed through setting the hand throttle for too much that the engine keeps on pulling when the foot is released from the accelerator. The smooth performance is there, so why not use it? The car that now troubles its owner can be spared the junk heap through this sort of co-opera- tion, while the new model, with its inher- ent features of superiority, can give surprisingly better results with 1925 ideas in driving. The average driver would probably resent being told that he does not even know how to start his motor efficiently. But this does not alter the fact that a little snooping around any public garage will show him taking five times the re- quired time to get the engine into work- ing shape. One mistake as old as the self- starter, but the few car owners who are aware of it contend that it is just as much is gas, so Don’t Drive with Your Foot on the Clutch is nition. The spa: will then cat: one of the cylin ders with a mo: readily combu tible mixtur« When the driv starts by switchin on the ignition, 1 often happen that the spark ic nites some of t! earlier and weak: charges of g: This Is the Proper Driving Position for the Feet—t Right Foot Only Being Used

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POPULAR por. These are not of proper mixture for a ilstart. That gives him - well-known half-dead tion of a cold motor, nd starts him on the ivy to flooding the en- ne with raw gas, and ther difficulties. Un- miliarity with the type ignition on one’s car another reason for iny starting troubles. \ number of cars are now equipped with semi-auto- matic spark advance, hich means that in cranking it isn’t neces- iry to retard the spark o far as is necessary in cranking a car of the con- ventional spark - control type. Some manutac- turers do not recommend any retarding of the spark for the semi-auto- matic type, since the dan- ger of back fire in crank- ing is very remote with this arrangement. Thus the driver who retards a spark that is already partially retarded simply encourages sluggish action on the part of the engine. \ favorite trick in pulling out of the garage is to allow the engine to race mod- erately, obtaining slow speed out of the car itself by only partially letting in the clutch. Owners are pleased with the way this plan helps to warm up the engine and ive time, never realizing that anything ived is more than offset by the strain on the clutch facings. Usually the friction created in this starting process is not suf- licient to injure the plates themselves, but the facings or linings are often badly damaged. The use of the choker is illogical in nine tarts out of ten. So much has been writ- ten regarding the danger of excessive use ot this device that most drivers today are running to the opposite extreme. There is a constant cry for something to take the lace of this troublesome control, but lack of improvement along this line does not trouble the car owner who is wise enough to adopt a few new ideas in driving. Watch the average driver during the tarting process. Time and again he will y to start a cold motor without first pull- the choke control all the way out. lls means that the first dozen or so turns the engine are waste effort, the cylin- MECHANICS 951 In Driving down a Hill Always Let Your Engine Act as a Brake—It Will Save Burned-Out Linings ders merely starving for want of some- thing to fire on. Then, after the engine has started, the usual thing is to push the choker all the way in and keep the engine from stalling by opening the throttle rather wide. Aside from the possible damage to the bearings, this practice simply means that, while the engine will usually keep going, some of the cylinders are not firing half the time because the mixture is far too lean. The owner thinks he is sparing his car the hazards of crank- case dilution by sparing the choker, whereas, on the contrary, he is actually inviting dilution through loading up some of the cylinders with unburned gas vapor or raw gasoline. Here is the automobile being improved by the addition of oil purifiers and crank- case rectifiers, yet here is also the average driver offsetting the advantages. In one of the new cars offered this year the cir- culating water passes through the crank case in such a way as to warm the con gealed oil in starting and keep the oil cool during hot weather or at high speed. But such valuable improvements are meaning- less if improvements in control do not go with them. The driver who operates his engine wisely saves himself the expense of burned bearings, either at high or low speeds in summer or winter.

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952 There has been a lot of talk about bal- loon-tire “shimmy.” Front-wheel shimmy is as old as the automobile, but thousands of drivers never encountered it until they started to use balloon tires, and then auto- matically blamed it on this new develop- ment in pneumatics. The truth of the matter is that nine-tenths of all so-called balloon-tire shimmy is the result of driv- ing too fast over rough roads. Without balloon tires most of the drivers who ex- perience this quivering of the steering gear would probably turn turtle. Similar psychology applies to the use of four-wheel brakes. Drivers have tried to stop dead at unreasonable speeds. Only the other day a car with balloon tires and the finest type of four-wheel brakes skid- ded and turned over because the driver thought that steering didn’t matter. Knowledge of the truth in these stories is encouraging the progressive driver to operate his car even more carefully than in the days when tires were narrow and smooth and when brakes could not even be relied upon to work. He will then ob- tain from his car the results these new improvements were intended to produce. Any driver who does not discover some- —— it yw” ipa rif) (i a Wy = i / eee eon pre iS Laon rc . wy Ns POPULAR MECHANICS thing new each time he takes the wheel ; not keeping up with the progress of mo- tordom. A driver who has discovered the danger of habit in operating a car, throv some light on this subject when he sa, that he is never satisfied until he feels that he and his car are working as a unit. When there is close co-operation, he points out, it isn’t necessary to keep dal bing the brake pedal or shifting gears o1 otherwise wearing out the car prem turely. He lets off a little on the gas ani allows the natural loss of momentum t do the work of the braking force when ever possible. He never shifts into hig! in traffic, when he knows he will hay to go right back into second. He coast Every day finds him discovering son new way to get better results from thx car, all of which is another way of sayin: that each day he learns something that wi help cut down depreciation and repaii The biggest developments are coming 11 the line of driving. The driver has bee: the automobile’s weakest link, and to: many of the improvements in the car itsel! have served only to make it weaker. Your car is only as good as you drive it. Try that on your straight-eight. Never Drive in Such a Way That Sudden Applications of the Brakes Are Necessary—a Steady, Even Pace Will Get You There Quicker and Save Your Car and Tires

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POPULAR RADIO AERIAL LIKE STOVEPIPE SENDS OR RECEIVES radio antenna designed for installa- either with a broadcasting unit or iving set, is shaped like a stovepipe | is said to make possible greater selec- y and more volume than the ordinary als. The device, which is formed by a es of wire windings, was tested on a watt station at Mc- ik field and was re- rted to operate with eater efficiency than er types in general use that point. Its in- ntor claims its applica- ; n may result in con- %* erable changes in the ethod of broadcasting | receiving. SAWDUST WALL COVERING Economy of time and is sought in a pat- ted wall covering made ncipally of sawdust d that is applied with damp roller. It is said adhere equally well to rown or white finish aster, wallboard or gal- anized iron, only one oat is needed, and none of the material falls to the floor. The tendency sawdust to stain is re- orted to have been overcome by boiling t in a borax solution. Ready for Service at SMOKER KIT FOR AUTO OR TABLE HOLDS CIGARS AND CIGARETS For use on the instrument board or ther convenient place in the car, or for the table or desk, a compact metal kit that hold cigars and cigarets and has space for box of matches and ash tray, is always ithin easy reach, keeps the tobacco n good condition nd eliminates loss nd muss. It has compartment on ach side opened a small button nd is finished to irmonize with the upholstery of the auto r the furniture of the home. Models are o made with electric lighters installed id a similar box holds a vanity case. MECHANICS 953 BATHTUB IN MOTOR-BUS FLOOR ADDS COMFORT TO CAMPING Motor vehicles fitted for long cross- country tours are furnished with an added i Ss > . ve Sy by iy = \i 7 : —| i ore the End of a Dusty Journey, the Motor-Bus Bathtub Is Concealed in the Floor convenience in a bathtub built into the floor and concealed by a trap lid when not in use. The basin is fastened securely so that it cannot rattle when the car is mov- ing, and is eH tied by removing a plug in the bottom. OVER SIX MILLION PEN POINTS USED IN POST OFFICES To keep its patrons supplied with writ- ing implements, for next year, the post office departygent will furnish 6,185,000 pen points €t.distribution to the nation’s 52,000 stations. The public will also be provided with 480,000 holders to accom- modate the great volume of nibs. The pens are almost every style so that a point may be found on the post-office desks to suit practically any writer. For the same period of time at least 900,000 quarts ot writing fluid will be required to keep the inkwells filled, and 500,000 large sheets of blotting paper will be used up.

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SEAT ADJUSTER ON SMALL CAR ADDS EASE AND SAFETY For the short-legged driver who has difficulty in reaching the pedals of an auto- mobile, a sliding seat adjuster that can be installed with little trouble, reduces the discomfort of running the auto and les- sens the likelihood of accidents. It is essentially a mov- ing platform set in a runway that is controlled by a geared shaft and operated by a single small metal wheel on the base of the seat. By simply turning the knob, cushion and back are set at any lesired distance. There is no loose play, preventing accidental moving by a jolt of the car, and the parts are so arranged that they cannot easily get out of order. Ex- tra cushions and other makeshifts are elimmated with this adjuster, which is now made especially for the sedan type. ————— Or POPULAR MECHANICS Cleaning Advertising Sign with Steam and View of the Mot Outfit, with Its Boiler, Gasoline 4 and Soap Tanks, and Hose Lines Which Brush Operators Carry or Belt Harmess and Control with Nozzles STEAM CLEANER ON WHEELS KEEPS SIGNS NEW A steam-cleaning outfit on wheels is be- ing successfully used to renovate adver tising signs. The equipment consists of a 300-gallon tank of water to supply the boiler, and two smaller ones for gasoline as fuel for the burners and for soap) water. Lines of flexible steel hose, eac! fifty feet long and inclosed in rubber wit! control valves for regulating the amount of steam, soap and water, extend from the tanks. The nozzles are carried by the operators on a belt and shoulder-strap harness. With this apparatus, it is claimed two men can clean a sign in a fourth ot the time required by other methods. STEAMER AS CHEMICAL PLANT TO EXTRACT OCEAN BROMINE Abundant supplies of various chemical may be obtained from the sea, it is pre dicted, if success attends the venture o the steamship “Ethyl” which has been fit ted up with refining apparatus to tap th: Atlantic ocean of its bromine, a materia used in the manufacture of ethyl gasoline

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POPULAR MECHANICS on-picture photography and in medi- It is estimated that there is a pound is substance to every 1,700 gallons of vater. It is now obtained by laborious esses from mineral springs and from ish deposits in Germany. The “Ethyl” draw aboard and discharge water at rate of 7,000 gallons a minute, retain- the chemical in its refining devices. eet of similar boats is proposed to ex- t also other substances if this experi- nt proves practical. GYPSUM MIXED WITH CONCRETE SAVES TIME IN BUILDING Gypsum, the material used fort the finest ster walls since the days of the ancient yptians, is now helping to build, al- st overnight, substantial dweHings for erican citizens. <A specially treated de of it is put in the concrete and ired into forms like those used in or- iry cement work. Heat generated by gypsum causes the mixture to set in it thirty minutes, it is said. A new se can thus be poured on top of the t one with little delay, and fewer forms needed. In New York, a two-story lence was completed to the roof in twenty-two working hours, it is re- ted. A recommended mixture is one rt sand, three parts cinders to one and e-half parts of the cement and gypsum.

tting Up the Forms for Already Poured

a New Course of Gypsum-Concrete on Layer

When the Card Is Shaken the Outline of the Funny Face Changes into Many Grotesque Shapes SHAKE OF CARD CHANGES FACES ON FUNNY CARTOON A toy amusing to both old and young is a cartoon of a funny man that changes faces when the card on which it is printed is shaken or lightly tapped. The outline of a portion of the features is loose so that it can be made to form a variety of gro- tesque icttires. Since the head and shoulders of the drawing are printed and in colors, the slightest vibration of the article produces a complete caricature. By moving the flexible line with the fingers, figures resembling the popular characters of the comics may be easily created. OIL FIELD FOUND IN ARGENTINA Traces of oil have been discovered by road en- gineers who were drilling for water near Magda- lena, Argentina, only sixty miles from Buenos Aires, according to re- ports. Should the supply prove to be of commercial value, it will be of great economic importance to that region, for the oil now refined there must be carried a six days’ journey in tank steamers

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956 POPULAR MECHANICS Motorizing Khe . cean Highw Courtesy Burmeister & Wain Norwegian Cargo Vessel “‘Borgestad,’’ Typical of Latest Motorships; It Burns Six Tons of Oil Every Twenty- Four Hours and Has a Cruising Radius of 50,000 Miles By H. T. WILKINS [| the spring of 1926, a radio message flashed from Sandy Hook lighthouse to Manhattan will announce to expectant New York the passing of a_ splendid 20,000-ton motor liner up the Narrows to New York harbor. No dense pall of smoke will belch from the funnels, for there will be no funnels. This motorship will be the advance guard of a great fleet of transatlantic liners, marking a silent revolution of the sea and forecasting the passing of the tur- bine ships, with their twin, triple and quadruple smokestacks. The day of the gigantic liner is over, according to no less an authority than Harold A. Sanderson, chairman of the White Star line. Motor- ships already are rapidly replacing steam tonnage in the merchant fleets of the world. This quiet revolution in marine engi- neering is the outcome of the wonderful engine invented thirty-two years ago by a German engineer, Dr. Rudolph Diesel, and brought by him to perfection in the Augsburg factories in 1900. Congress is alive to the vital part the motorship will play im the race for commercial prosperity and power on the high seas of the world. In its last session of 1924, it rushed through a bill authorizing the shipping board to spend $25,000,000 in converting fifty of its steamers to motorships, and the board has just let contracts for eighteen Diesel installations. In the Diesel system, power to drive a ship on the sea or a railroad locomotive on land is obtained by the burning of a mixture of gas in the cylinders of an en- gine resembling that used in an automo- bile, except for the fact that no electric spark is needed to fire the gas. How is it done? The air in the cylinder of a Diesel engine is compressed with a force of 500 pounds to the square inch. This compression raises the temperature of the air to about 1,000 degrees Fahrenheit. So hot does it become that oil, sprayed into the cylinder at the high pressure of 75) pounds to the square inch, immediately takes fire. Greater heat is caused, result ing in an expansive force which drives the piston, and, finally, the ship’s propellers Commercially, the advantages of the motorship are very great. Boats drive: by Diesel motors save seventy-five pe! cent on the space needed to carry fuel, the importance of this being that more space is made available for cargo, with appre ciable effect on the earning power of the ship. The fuel bill of a motorship is smal! compared with that of a steamship or an oil-burning ship with boilers. At sea, a motorship of average size will consume fifteen tons of fuel a day, where an oil- burning steamer would need thirty tons

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POPULAR MECHANICS — \ Looking Down from an Airplane on a Queen of the Seas, the “Majestic.” — Leaving New York Harbor, and, Be- (ay —— - low, View of Six-Cylinder Diesel PQS =" Engines in Erecting Shops = > er Photo © H. Maxwell; Lower Photo Courtesy Burmeister & Wain

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958 =e 7, J : sys : 3 ’ Pins S'P iw es wees Recalling Days Before Steam Ruled; Glimpse of Masts and Rigging of Large Danish Barque That Still Re- sponds to Hemp and Canvas POPULAR MECHANICS A high-seas motorship can also carry more cargo than a steamship of the same si because a vast amount of space in the engine room of a steamship is taken up by boilers, which are not needed by the motorship. Water-ballast tanks, holding a _ non- paying element on the steamship, are al- sent from the motorship, as may be see: in the case of the “Fulda,” built and launched by the German Weser compan, at their Bremen yards, in the spring of this year. A novel feature of the “Ful da’s” hull is a “bulge,” which does away with the need for water ballast, and re places it with oil. The net result of this innovation is that the “Fulda” can cart twenty per cent more cargo than a stear ship of the same size. On the human side, we now witness the passing of the grimy, toil-worn sailor u dergoing the exhausting labor of coaling a ship under a hot, tropical sun; o1 stripped to the waist and sweating in tl inferno of a steamship’s stokehold in equ torial waters, shoveling coal into a ca dron of flame, or spraying oil under ship boilers at a gasping heat. In Europe, the small Scandinavian countries are vying with each other i: transforming their ocean fleets to motor ships. The Swedish-American line now has under construction a twin-screw ship with accommodations for 1,650 passen gers. The craft is about 17,000 tons gross and will make a speed of around seventeen knots. The power will be supplied by two six-cylinder, four-cycle, double-acting en gines. The craft is expected to reac! New York in June. Mr. Gunnar Knudsen, the ex-premier oi Norway, is president of a company whic! has just launched a new twin-screw, 6,800- ton motorship, the “Borgestad,” with a speed of ten and three-fourths knots Burmeister & Wain of Copenhagen, the first to place a Diesel installation ina large- sized cargo vessel, are the builders of the “Borgestad” and the sister ship “Selandia.’ Use is second nature, even in engineer ing and mechanics, and there are not a few people who would feel a pang of regret !! the familiar smokestack disappeared from ocean-going ships. Funnels, however, are of no real use on a motorship; but, for appearance sake, they are none the less in stalled. A British-Indian Diesel ship doing a coast trade in eastern waters, uses her funnels merely as ventilating shafts up which foul air from the ship’s interior is expelled by a powerful blast. The Hamburg-South America shipping line was last year compelled to equip its

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POPULAR MECHANICS —— Scenes of Steamer Power Plants; Stokers Protected from Fumes by Masks While Working on Boiler Tubes, and the Engine Control Platform of the “‘Leviathan”’ — \\ ——e == ae peer Phot yston V *hot © Keystone; Lower Phot Cc

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960 : POPULAR powerful motorship “Monte Sarmiento,” with two dummy smokestacks because ignorant immigrant passengers think no ship can be safe without smokestacks! Not only have motorship owners been forced to put smokestacks on their ves- sels, but they have also had to give them air whistles apparently emitting steam. A siren sounded on an ordinary steamship, warning other vessels approaching in the fairway, gives rise to a “white feather” of steam as well as a piercing blast. The pilot, standing in the wheelhouse of his tug, sees the white feather blowing from the siren even when he cannot hear the sound of the blast. On the motorship, in the ordinary course, he would see no smoke, since the siren would be operated by air or elec- tricity. The American Sperry gyroscope company has overcome this difficulty by devising a visible air whistle, blown by compressed air, and emitting a white cloud of smoke in much the same way as mili- tary airplanes send out smoke screens. As soon as the whistle valve is opened, air is let into a nozzle which takes “liquid smoke” from a tank and blows it out in a white cloud from the siren. The battle between oil and coal is grow- ing fiercer, Lloyd’s register for shipping for 1925 showing that more than half of all the tonnage under construction is motorized. The world’s first ocean-going motor liner “Aorangi,’ recently completed a maiden voyage from Southamp ton, England, to Vancouver, on MECHANICS the round trip to New Zealand and back. The motorship kept up an average speed of seventeen and one-quarter knots on the voyage out to Vancouver, burning fifty- six tons of oil daily not only in the Diese! engines but also for such auxiliary pur- poses as those of the laundry, cooking and steam heating. When the “Aorangi” reached Vancouver, she had burned 1,250 tons of oil, at a cost much less than that of coal under a steamship’s boilers or oil from an oil-burning liner’s sprays, on a similar vovage. At a trial trip in Englis! waters, the “Aorangi’ reached eighteen and two-thirds knots an hour. This motorship, which is the climax of twenty years of experiments in marine e: gineering, has four screws and carries 97() passengers and 330 officers and cre\ Hardly any firemen or oil trimmers age needed on this boat, which is so free fri vibration that, during a violent gale o the trip, the ship’s saloon seemed pract cally as motionless as a hotel lounge ashore. A specially sprung dance floo: and a radio cabin, with wave and spark instruments which can receive newspaper: messages and shore broadcasting pr grams, are some of the boat’s features. A novelty in life-saving devices on board the ship consists of motor lifeboats, each carrying fifty people and launched b automatic davits. Massive Crankshafts That Will Propel a Motorship under Construction in Copenhagen Yards liad HU

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POPULAR MECHANICS rchitect’s Drawing of the Gigantic New Produce-Market District in Chicago Where the Foodstuffs of a Great Part of the Nation Will Be Received and Distributed HUGE MARKET TOCUT FOOD BILL OF NATION TEN MILLIONS Reduction of handling charges of food- ffs and elimination of waste caused by nsportation delays and accidents to ments of farm products, it is claimed, result in an estimated saving of more $10,000,000 on the food bill of the n, when the new produce-market dis- in Chicago is completed. The mar- which will be the largest of its kind e world, is scientifically planned to mmodate more than 300 concerns ing in foodstuffs. The district will be ited almost entirely to wholesale ex- ige, and will occupy six city blocks sist of 165 buildings in which an ial business of approximately $500,- 000 will be transacted. The structures to be three stories high with a’ com- ed floor space of 2,000,000 square feet. ng the entire fronts of the buildings, ling platforms will be provided for cks, wagons and other vehicles. GLOVE LEATHER FROM TREES IS SUBSTITUTE FOR KID \ vegetable leather which is said to com- pare favorably with the animal product il costs less than one-fourth as much in e manufacture of cheap kid gloves is be- ‘ produced from the “mitsumata” plant. is prepared by stripping off the bark | removing the inner layer of wood ile it is moist. This is passed through rious chemical processes which render it pliable and warm. The material is easy to work up, and the gloves, when finished, readily “give” to the hands, and do not interfere with the circulation. RULER WITH MAGNIFYING GLASS USED AS LETTER OPENER Reading glass, ruler and letter opener are combined in a single convenient ar- ticle for the desk or pocket. The lens is at the blunt end. The ruler is divided in to inches on one side and millimeters on Ruler and Letter Opener with Lens, and How It Is Used as a Reading Glass the other, while the blade is shaped to cut pages or open envelopes neatly and easily.

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962 POPULAR MECHANICS BOAT SHOWN IN CRADLE FRAME TO GIVE INTERIOR VIEW Visitors at a motorboat show were able to inspect the interior of one of the craft FIFTY MILLION MEALS IN YEAR SERVED IN. DINING CARS Food consumed by the railway di: cars of the country for one year would | sufficient to supply) town of 600 people f: period of seventy y and allow every per three meals a day. serve this amount foodstuffs to traveler the diner services lay proximately 50,000,000 table covers, and to p: vide the meats for menus requires ab: 30,000 head of cattle About $2,000,000 is sp: for bread and butter « ing the year, and 8(K* 000 pounds of beef I Inspection of Boat’s Interior at Show Was Simplified by the Cradle Frame Easily Tipped at Any Angle without difficulty as the boat was locked in a cradle which the attendant could tilt to any desired angle. Collars at the ends held the prow and stern and they were inserted within grooved supports resting on the floor. S-BEND IN STREET AT CROSSING REDUCES AUTO HAZARDS As an experiment in safety, a novel ar- rangement of the road and crossing signs is being tried in Florida at a grade inter- section with a railroad. At the right, on either side of the track, the street is curved and is guarded by 2,000,000 pounds eac! fish and ham are used in the same lengt! time. More than 6,000 dozens of « and almost 17,000 quarts of fresh and cream are served in a day, while t potatoes consumed annually are equ lent to the yield of 6,000 acres of plant land. A _ year’s provision of ora amounts to 2,500,000, and 1,250,000 gra fruits and 3,250,000 pounds of sugar required to satisfy the appetites of nation’s travelers. Out of one hund: patrons it has been learned that practi eighty-five order coffee with their m: Thirty-five of the same number will ta roast beef. Chicken is the next favor meat, after which come fish and steal a stout wire fence to keep autos from plunging through. Motorists are thus prevented from driv- ing straight across the rails and in slowing down for the curve, naturally become on the alert for trains that may be ap- proaching. The sign, supplemented at night by a bright red lamp, is placed in the middle of the road at the end of a plot bordered by a white curb, which serves to emphasize the warning. The. curve is said to dis- courage drivers from attempting to beat trains across the tracks, one cause of many accidents. Twist in Road at Railway Crossing for Greater Safety; Strong Fences Gu Sides and Also Serve as Warning Signs rs M

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POPULAR MECHANICS \I RE than $1,340,000 was spent by . ederal and state governments dur- 24 for the destruction of predatory and rodents. The resulting cam- vas one of the greatest drives ever d against dangerous and destructive from bears and wolves down to mice. hundred and twelve picked hunt- re the brunt of the campaign against eat eaters, who were taking toll of horses, sheep, hogs, chickens, deer, iin goats, elk, and even the game the west and parts of the east, t and southern states. They were eral game hunters, and every one xpert with rifle, trap and poison. he season closed, they counted up ns or scalps of 38,591 predatory and estimated that about 100,000 had been poiso1 ed. bag brought in included 562 wolves, untain lions, 193 bears, 3,507 bob- Canadian lynxes, and 34,092 coy- Of wolves alone more than 5,000 een killed and scalped since the ment hunters took over the job in in-addition to hundreds which have poison and not been found. predatory-animal campaign, while st spectacular, is but a small part work done by the bureau of bio- survey of the department of com- e, In co-operation with various states ities. The war on destructive and se-carrying rodents is even more im- nt. The year’s work included cam- ns against prairie dogs, ground By J. EARLE MILLER rabbits, wood- jack rabbits, chucks, field mice, cotton rats, kangaroo squirrels, pocket gophers, cottontails, snowshoe rats, house rats and mice. No less than 66,000 farmers and stockmen co-operated in wiping out rodent pests on 8,000,000 acres of land during the year, while whole cities joined in anti-rat and mice cam- paigns. Since 1916, 12,000,000 : federal land and 105,000,000 acres of state and private lands have been practically cleared of pests by carefully organized poisoning, trapping and gas attacks on inderground burrows. Seventy lion dollars’ worth of crops have acres ol two mil- been saved by this work alone since 1916, the bureau estimates. Some of the small rodents are unbe lievably destructive. One = Arkan farmer, with a nickel’s worth of poison bagged two cotton rats which, within a few nights previously, had gnawed and worth more Damage by jack rab d other crops 1S SO great ruined 1,000 young citrus trees, than a dollar each. bits to alfalfa ai in several sections that widespread drives vere organized to their number. One Colorado drive netted 20,000 rabbits hich were shipped to Denver and distrib uted free among the poor. Two Kansas drives brought in 10,000 rabbits, 13,000 vere bagged in North Dakota, 50,000 in one Oregon county alone, 25,000 in Texas, and in Utah 536 co-operating systematically covered 128,220 acres with poison and killed 340,500 jack rabbits in the greatest rabbit war vet staged. The wholesale execution of rodents, however, reduce ¥ 1 Trancners

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Two Mountain Lions Treed in a Yellow Pine near the Northern Rim of the Grand Canyon; Deer Herds on the Plateau Have Increased Amazing- ly Since Government Hunters Stepped In Photograph by Jacob Neitzling, Courtesy the United States Biological Survey is far less spectacular than the work of the wolf and mountain-lion hunters, who go out single-handed to pit their skill against the craftiest pests in America. While thousands of rats or rabbits pile up considerable damage in a season’s time, a single wolf has been known to kill $25,000 worth of live stock, a good part of it out of sheer deviltry and not because of hunger. One of the most notable kills of the year was an old white wolf in Ari- zona, who had wantonly slashed the throats of sixty-five sheep in one night, and forty in another, while he averaged a calf for food about every four nights. The old wolf was such a wanton killer that a pack of from twelve to fifteen coy- otes followed him and feasted off the kills he left. Stockmen estimated the white wolf's food bill was considerably over $25,000 when he finally succumbed to a skillfully placed poison bait, set by a gov- ernment hunter. The stockmen had placed a bounty of $500 on the animal's head and many private hunters and trap- pers had worked for months at a time to earn the reward, but without success. Another marauder, known as _ the “butchering wolf,” was trapped in Colo- rado. It took its name from a peculiar practice of biting off the ears or tails of calves and even full-grown cattle after it POPULAR MECHANICS had killed one and eaten its fill. Hun of animals were mutilated before a ernment hunter was called in. He over the territory and marked the ani: habits and trails, then set his traps. first inspection found the wolf caug’ A notorious she-wolf was killed hunter who rode its range south of | lo, Colo., for three weeks before he the animal. She had been in traps se times, losing a toe on each front foot wounds healing so perfectly that her t had the appearance of a naturally t toed animal. Another old wolt trapped in Colorado, after it had p heavily on deer, cattle and sheep. \\ she finally met her end, the hunter seven unborn pups. In three pre years her dens had been located and tal of twenty-one pups destroyed. In many districts the hunters thinned the wolves out so far that remaining animals try to entice away from ranch houses as mates. ‘| was poisoned within thirty yards ranch-house door in Arizona when

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POPULAR MECHANICS ng in a Full-Grown Mountain Lion, Above, rapped Coyote Glaring at His Captor, a Biological Bureau Hunter wn on such an errand. In one along the Oklahoma-Arkansas fourteen wolves were bagged in a vs, eleven being poisoned and three ed, while hunters in southwestern iri accounted for ninety-three dur- he year. tes, while less dangerous than es, are considered far more destruc by the government, because they are ich more numerous. The coyote indicates there are several million in the country, and since they enormous litters, the hunters’ work takes care of the normal increase. are much cleverer than wolves in ling traps and poison bait, and as they lriven back by men, adjust themselves surroundings so easily that they now found in the high rockies, in £ e forests, and have even extended AG range to Alaska and the Mackenzie 4 er delta in the Arctic. They persist- 965 ently follow game and live stock in their seasonal migrations between summer and winter pastures, constantly preying upon the young, and even adults. They also destroy an enor- mous number of eggs and the young of ground - nesting birds, including sage hens, prairie chick- ens, quail, grouse and other kinds of fowl. They are as clever as foxes at concealing their dens, and ac- tually rear their families close to ranch houses. One hunter located

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966 POPULAR MECHANICS eight dens near one ranch, and destroyed forty-eight young pups in them. The war on the coyotes is mostly con- fined to poisoning, with some trapping. Poisoning is carried out on a large scale. Last year, 3,567,000 poison baits were es- tablished in an .area covering 284,400 square miles. A Texas rancher, after studying government methods, established a poison line 100 miles long and found fifty-seven dead coyotes at the first inspec- tion. An Oregon rancher bagged twenty-nine on his NO etl line, and one Arizona Trapped Bobca 7 Looks as Innocent as a House Tabby Center, Placing Bait | for Coyotes ranch killed 140 within a short t': The mountain lion’s kinship to the c mon house cat was turned against him | the first time during the last two yea when government hunters applied oil catnip as a bait to cover their pois: The lure of catnip proved irresistible { wily old lions who had evaded poison s« for years. During the year, 237 full-grow mountain lions were poisoned or shi bringing the total bag since 1915 to 1.23 One Arizona hunter, after having eight Timber Wolf, with Long Record of Killings, Snarls to the Last

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POPULAR lis sheep wantonly slaughtered in one rht by a lion, put out a poison and cat oil set and the next day found the ttender dead. Oil of catnip also proved a lure to bob- s and Canadian lynxes, the federal inters getting 3,448 of the former and nine lynxes during the year. The tnip is used as a trap bait, and some inters reported taking every bobcat that MECHANICS 96 Skis and a Rifle Help Government Hunter Bring Down Two Idaho Wolves in Winter; Left, Biological Survey Hunters with a Coyote Shot at Long Range near a trap where the powerful odor was present Be came ars are protected as game animals and are onl hunted down and killed by the government men when there is good proof that they have gone bad and be come meat eaters, yet 193 vere slain in seventeen states during the year. One notable kill was made in the Okanogan forest, in Wash- ington, when a hunter shot an old grizzly which had killed iarge numbers of sheep and cattle for three years. The work of the hunters has also been spread to Alaska, where wolves, lynxes and, in some cases, bears were killing fawns in the reindeer herds being estab lished for Eskimos and Indians. The gov ernment hunters are also wiping out the wolves on the islands off the coast, making them available for fur farming.

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968 POPULAR MECHANICS Serviceable Rubber Blanket That Makes an Ideal Addition to the Camp or Motoring Equipment and Son of the Many Uses to Which It May Be Put to Guard Health and Clothing RUBBER BLANKET FOR CAMPERS SAVES HEALTH AND CLOTHES A rubber blanket with eyelets through which ropes may be passed to make wrap- ping secure, can be folded up and slipped in the side pocket of an automobile. Snap fasteners are provided so the cover may be used as a poncho leaving the wearer's arms free for other tasks, or it may serve to spread over the ground to save the clothing when making repairs to a car. As it can be easily washed, the sheet can be placed over grass as a tablecloth for picknickers, and can be stretched between trees as a sunshade. Laid on the ground beneath a camp sleeper, it keeps both the bedding and occupant dry and warm. Thrown over a rope stretched between two trees or stakes, a pair of the blankets make a roomy waterproof tent. RAIN ACTS AS AIRSHIP BALLAST SAVING VALUABLE GAS Rain water at seven dollars a pound may seem a bit high in price, but it was worth that much to the dirigible “Los Angeles” on her return from Bermuda to the United States. A heavy storm was encountered during the voyage, and about 2,000 pounds of water accumulated on the huge enve- lope. On its arrival at the Lakehurst hangar, this extra ballast permitted ship to be brought to the ground with releasing any of the helium. The « mated value of the gas thus saved $14,000, making the rain water wor' seven dollars a pound. ADJUSTABLE SCHOOLROOM DESK CHANGED BY PUPIL Mounted on a single pedestal, with o1 arm extending forward and holding t seat and another toward the rear and | ward to carry the desk, a school desk | been designed that can be adjusted by t pupil in a fe seconds to proper height quired for him sit correctly comfortab Nine notches the arms per! the desk and s« to be raised lowered to many different levels. The changes accomplished by turning a handwheel a shifting a pin. @ Whenever you find that you wish know more about any article in the mag zine, write our Bureau of Information.

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POPULAR MECHANICS 969 = NON-TARNISHING SILVER KEEPS FOLDING ELECTRIC-LIGHT BATH BRIGHT WITHOUT CLEANING IS EASILY PORTABLE ‘ er said to resist tarnish and to stay The benefits of treatment by electric- without frequent cleaning or pol- light baths may be enjoyed by a patient : has been discov- : ( by an English 4 st. Containing r than nine-tenths of i ire metal, the ma- can be worked by dinary methods : ‘h the same results as smmon variety, and ites the need of es or other treat- t to preserve tlie With this prop- 4 it is claimed the j tarnishing metal is } ible for use where ae Sei a ag | tendency of silver to Placing Folding Electric-Light Bath over Patient for Treatment; a Blanket en and grow dull overing Keeps the Heat In; Insert, Cabinet Collapsed sitates considerable ; | t to keep its surface free from defac- with a collapsible cabinet designed for use | blurs, especially when the objects’ in the home, hotel room, or wherever cur | not frequently handled. rent is available for its operation. The ap- paratus is compactly constructed and can TWO BARRELS OF O1L A MINUTE folded into a small package for pacing KEEP HUGE TURBINE COOL Pcp sie: toes: a few minutes, and where necessary, may eighing nearly sixty tons, the huge be entirely handled by the user. The of a 45,000-horsepower steam tur- portable incandescent-light bath is said to e built for a Los Angeles lighting plant be harmless to patients too delicate to produce so much heat in the bearings withstand the effects ot treatment with operating that two barrels of oil Steam or hot-air appliances. Curtains and minute will be necessary to lubricate ards are provided for the lamps to pre- 4 e mechanism and keep it within safe Vent possibly dangerous contact with the perature. At full speed, the outside Patient or bed clothing. of the largest section of the massive ne will travel nearly 600 miles an hour. CAPTURED WAR STOCK SERVES proximately 5,000 small blades compose FARMERS IN ARGENTINE eries of rings which make up the ap- tus. The turbine will be used with a Practical use of quantities of light rail erator to produce electric current. road material taken from Germany afte? ' the armistice is being i a made in Argentina as feeder lines. Nineteen small German locomo tives, thirty-seven gaso line tractors and 2,300 cars, the kind employed to carry rations and mu nitions to the trenches, are hauling grain and po- tatoes from the farms to the stations. As the roads on the Argentine pampas become very bad i“ after rains, the equipment has been of great service Gigantic Turbine Rotor Which Requires Two Barrels of Oil a Minute to the farmers.

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POPULAR MECHANICS ce Two Americans Who Made the First Trip from Winnipeg to Victoria, Can., Last Summer Found No Road through the Rockies, So Used the Railroad Tunnels in Passing the Divide

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, 4 POPULAR MECHANICS * Blazing Trails. Rk for Motorists © ~ —" Road Mappers Risk Lives in Hunt for Routes; Dozens of Instru- ments Make Recording of Topography Almost Automatic | ) ) you know the best route from Kalamazoo to Kankakee, or, for that er, from Portland to Portland, the n Maine and the other in Oregon? ou don’t, Danny Nee can tell you, D. J. Nee is the official pathfinder of rica’s automobile highways. He is pilot of “Wayfarer IV,” the American mobile association’s scout car. You have to know Danny Nee or consult personally to find the best route from re you are to where you want to go, his findings in 600,000 miles of travel ready in written form in the A. A. A. distributed by the millions each through the 700 clubs affiliated with parent organization. Several other pping crews are constantly at work ng add to the road knowledge of the ntry, but Nee is the king of the adven- us clan of pathfinders, having been at nger than any of them. e life of a mapper is adventurous, for h of his work is done over highways are roads on paper oniy, and exist in fact as Indian trails or wild-game runs in the mountains, or perhaps as shifting sand in the desert. When the fine Roose velt highway was laid out the mapping car plowed over rocky trails, forded swift mountain streams, bogged in river bot- toms, and bounded and twisted up the winding game trails over mountainsides. One of the veteran drivers, back in those early days of road pathfinding, was ma- rooned for eight da tiny island, hemmed in by a sudden flood. The only other living creatures within sight a few prairie which had sought refuge on the same hill, and during the last two days averted death by starvation The same veteran trail caught on the Apache trail with a radia tor boiler dry and forty miles of desert sand to the nearest water. He had eight quart bottles of wine in his car (this was several years ago) and had to sacrifice all of them to keep the engine cool until the next water hole was reached. Curiously enough, his most trying experiences have VS ona were dogs blazer was

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972 POPULAR MECHANICS from Winnipeg to Victoria, B. C., last sumt winning a gold medal for blazing the trail, a constant succession of hair-raising exp: ences. Canac cause tains. high Srecial Flanged Wheels Were Used by Pathfinders - -_— in Canada Where the Rail- road Bed Was Too Rough to Permit the Use of Rub- ber Tires been with insects. On one occasion in western Kansas swarms of locusts plas- tered the radiator until the fan could not draw air through it, and he was forced to stop until the migration passed. On an- other occasion the pathfinder and his crew were under medical care for several days following attacks by a huge swarm of mos- quitoes in the Bad Lands of the Dakotas. Austin F. Bement, vice - president and secretary of the Lincoln High- way association, who, with a companion, made the first automobile trip in history Many miles of the trip across wester: la had to be made on railway tracks, there were no roads through the moun- They drove their car across enormou trestles, bumping over the ties, with guard rails to protect them from a dr into streams far below. They rode through miles of railroad tunnels, where there would have been no chance to « cape had a train approached. And between times they bumped over some the worst future road sites ever met » The road-mapping job, though, been simplified in recent years by the « velopment of special instruments to rec: the desired information. Twenty to tw« ty-five recording devices and contri make up the instrument board of a pat! finding car, and the pilot and his assista: must watch all of them constantly, besic: noting every left and right turn, hill at valley, crossroad and railway, and su landmarks as churches, schools an‘, } | amma 5) Ti Wl } \

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POPULAR MECHANICS — a PE, Te aan Bouncing Along across the Trestle of a Canadian Railroad, in a Land Where Automobile Roads Are Still Unknown ely settled districts, even the big red One of the biggest aids to mapping developed is a special adding machine ried by Danny Nee. Enough of the e keys have been retained to jot down mileage, and the rest have been pped with special characters and ab- iations, which record, on the same ¢ paper strip, all the information need- for the completed map. Nee simply es a button labeled “left turn,” er “right turn,” “garage,” “school- use,’ “bad road,” “railroad,” or any er desired information, and the word phrase is printed on the tape, with the Typical Going on a Pathfinding Tri P through British Co lumbia, and, Left, Rocky Road Scoured by a Cloud- burst and Washout in Western Part of Canada correct mileage from point. The roll of tape, “zero,” the starting which is auto- sent to the draft- to be used in preparing matically accurate, is ing department, new maps, or checking old ones of the route. With all the recording devices used, the pathfinding cars are frequently able to make thirty miles an hour and at the same time take an accurate log of the road. Should the road to be mz ipped hap pen to be between New York and Florida or New York and San Francisco, New York is taken as “zero.” A month out from Gotham the crew will reach Florida with the map log completed, while three months are sufficient to log a transcon-

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974 POPULAR MECHANICS tinental highway. Each day the tape from the adding machine is mailed back to headquarters in Washington, and by the time the crew returns from the trip, the map is well under way. The rough draft is compared with all existing maps of the same territory, and after every detail has been checked the measurements taken are plotted on government topographical charts, and these are then assembled for a section of the route connecting two cen- ters of population. For many years the drafting department faced a problem because westerners pre- ferred written logs of the road, while the east and south liked road maps best. The A. A. A. recently solved the problem by publishing a strip map which combined log and map, with the written directions of the first printed alongside the corre- sponding point on the map. But, getting back to Danny Nee and “Wayfarer IV,” the best-equipped of the official pathfinding cars, he designed it after hundreds of thousands of miles of travel to master all conditions of the road, and installed in it every conceivable ap- pliance for his work. It has a grade meter which shows at a glance the grade up or down a hill. altitude meter to give the elevation alx sea level; two speedometers, a thermo: eter, a barometer, and gas, oil and wat gauges on the instrument board. 17 board also has room for three butt which completely oil the car, controls { the twenty lights with which it is fitt: a graduated dimmer and an oil pump. With four-wheel brakes and a power! motor, roads ordinarily impossible mea little to the pathfinder. If the car bog down, there are caterpillar sand belts the rear wheels; if they fail, there is powerful motor-driven winch, capable pulling twice the weight of the car, and with sufficient cable to reach an ancho. placed on firm ground. And as addition precautions, there are clips on the bod holding a shovel, crowbar, extra front and rear springs, large containers for emer gency gas and water, and a special thometer on the dash to record the condi- tion of the battery at all times. The adding machine with its speci characters is mounted back of the driver seat, but within easy reach of either pas senger. Besides all this equipment there are an autolog on the steering column fo: recording expenditures for gas, oil, repairs etc., a visible note pad, two compasses, a small one on the dash and a large one i: the top of the car over the driver’s head a clock and an electric cigar lighter. Out Where the West Still Lives and Indians Appear “tin Person,” instead of in the Films, a Scene on a Path- finding Tour near Banff, Alberta; Note the Braids of the Unbobbed Brave

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Jrafting American Automobile ciation arters the Pathfi Road Logs Are Translated Where POPULAR MECHANICS 975 Room As- Head- nder’s into Maps for the Guidance of Fu- re Auto Tour- sts across Na- n’s Highways Instrument Board of Danny Nee’s Offi- cial A.A.A. Path- finder, Showing Mapping Aids Canada as Yet Has No Highway from Coast to Coast, but There Are Wonderful Stretches of Roads, Even in the Far West: Above Is a Typical Highway near the Famous National Park at Banff, Al- berta, with the Three Sisters Peaks in the Background J

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9% POPULAR MECHANICS Spillway of the Cornell Dam, in Croton River Valley above New York, Converted into Miniature Niagara by Floods That Caused Tremendous Losses of Water to the City CITY LOSES BILLION GALLONS OF WATER BY FLOODS Melting snows and heavy rainfall in the Croton river valley above the Cornell dam which supplies New York with water, are estimated to have cost a daily loss by flood of 1,500,000,000 gallons. The wasted vol- ume flowed over the spillway, which is 1,200 feet wide, into the gorge 150 feet be- low, in a torrent that resembled a minia- ture Niagara. Experts measuring the flow estimated the value of lost water at $200,- 000 a day, based on the charge made for it by the city. BOY DIVER FINDS PEARL WORTH FIFTY THOUSAND DOLLARS What is called the world’s finest pearl, a lustrous, peacock-green gem nearly three quarters of an inch in diameter and weigh- ing almost thirty carats, has been found otf one of the Gambier islands in the south Pacific ocean by an_ eighteen-year-old native boy diver. He parted with it for a small fortune, and the buyer is said to have been offered $50,000 for the treasure. lt is not an uncommon occurrence for the fishermen to go out in their little canoes in the morning and return at evening rich, according to their standards. The find oj the young boy, however, is said to be the largest in the records of the region. PUNCHES IN LOOSE-LEAF BINDER CUT HOLES TO FASTEN SHEETS Perforators fitted in a loose-leaf binder may be used to punch holes in papers t fit the fastening rings. A ruled scale also provided i the cover for the purpose of accu rately measuring the points to be pierced. The punches may b-¢ adjusted for pet forating other matter to fit cif ferent - sized file If desired, the cutters can be re moved from th binder for carrying on a key ring and re placed whenever material is to be punched @ Miners’ bunks are said to have give George M. Pullman the idea that resulted in the sleeping car.

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POPULAR MECHANICS 977 STENCH ALARM EMPTIES MINE IN TWENTY-NINE MINUTES o pints of a chemical of a noxious were used successfully in an iron in Minnesota as an alarm signal to e workers out of the shaft. The sub- e was introduced into the air-dis- rge line at the engine house and pene- <1 the underground tunnels so thor- ly that men half a mile from the ning detected it. Within twenty-nine ites from the time the chemical was ulated, 130 miners had received the ling, walked to the exit shait and bed 300 feet to the dry house. The was so strong that it worked its way ugh leaks in the air line and was il by the regular ventilating system. SELF-DUMPING SACKS ON TRUCK STOP WAST2, SAVE TIME ; containing cement and _ similar erials when carried on a dump truck, n be emptied automatically without un- ling them by means of fasteners which | the bags upside down as the body of vehicle is elevated. Besides saving uch time and work, the hooks make it sible to carry cement with loads of wet | and gravel without impairing its use- ness. Losses due to the material being vn away by the wind are also pre- ted. With the dumping attachments, re numbers of sacks may be emptied tically in the same time as required pour out a single bag by hand. uled with other materials, which it is to be bined, the cement readily emp-

Sacks Are Fastened to iow Seif-Emptying Cement Truck; Above, Load Ready for Dumping

TOY WARSHIP RUN BY BATTERIES BUILT ON OCEAN LINER Operated power trom with fully by a motor supplied batteries and storage

Model Maker and Toy Warship He Constructed aboard a Liner during Transatlantic Trips equipped with electric signal lamps and searchlights, a model of a Dutch destroyer built by an officer of an ocean liner has almost every accessory found above deck on the original of the copy. The hull is constructed of small strips of wood over a carefully laid keel and skeleton of the same material. The tiny craft can make fast speed in the water, and its motion can be regulated from the deck. A cook's galley has been provided where a toy stove and a set of kitchen utensils are in stalled. It required almost three years for the builder to complete the miniature and all work was done during trips on the Atlantic ocear Although the rolling and pitching of the liner ofte: made the task difficult the most delicate part were successfully fash ioned The model 1 about forty inches long URGE ROADS BE COLORED GREEN Minor eve troubles re sulting from the reflected glare from gray or white auto roads in Ie1 eland are al flicting a great umber ol drivers, a British optician de lares, and recon mends that green coloring matter be mixed with the surfacing material to curb the evil Che effects are said to be most pro nounced among drivers who are com pelled to vaze al the road ntently

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978 POPULAR MECHANICS SAFES IN MESSENGERS’ VESTS PROTECT BANK VALUABLES Telltale bags carried by messengers when delivering valuable securities have Vest Safe with Lid Off and in Carrying Position, Sewed under the Lining often attracted holdup men, are easily snatched away and can get lost. To pro- vide a safer way of carrying bonds and currency, a vest has been devised with a flat steel safe built into the lining and locked in front. The buttons and outer lap effectively conceal it, and it does not bulge sufficiently to be conspicuous. It cannot be opened except by the proper key. By using these safes, mem- bers of commuters’ train crews, who are idle dur- ing bank hours, may be satisfactorily employed to make deliveries in some cities, thus elimi- nating the need for spe- cial messenger boys and obtaining the services of bonded men who are trained to a sense of re- sponsibility. The steel compartments weigh but little and require no re- modeling of the garment. @Six months is said to be the average life of a dollar bill. Campers’ Auto Kitchen Prepared for a Homelike Meal in a Few Minute: without Detaching It from Its Place on the Trunk Rack TARGET RANGE MINED FOR LEAD WITH GOLD SLUICE A unique and profitable lead “mine being worked in an abandoned cornfi long used as a target range by a west: trapshooting club. Over the traps f: which clay pigeons are flung, an alm steady hail of shot has been poured years by sportsmen in practice and c: tests. The “prospectors” are reclaimi: tons of this lead with a sluicing machi of the type that has panned many milli: of dollars’ worth of gold from the strea: of the Pacific coast. Since most of metal pellets lie within six inches of 1 surface of the ground, “pay dirt” struck immediately with the first shov: ful of soil lifted. It is estimated t! approximately thirty tons of lead shot a: scattered within the limits of the ran; and a value of $5,000 accordingly has bee: placed on the mining rights. KITCHEN IN BOX FOR AUTO CAM! PROVIDES HOME COMFORTS A portable commissary for automobi! tourists, which holds an array of kitch: utensils and camp accessories, folds into a cabinet and can be fastened to t! rear of a touring car. The equipment i: cludes a stove, complete set of cooki: ware and refrigerator with water cool attached. Ample space is provided f{: linens and storage of groceries a: canned goods. The front of the cabine' folds out, forming a table with adjustab legs to hold the top level on unev ground. Collapsible seats are carried a separate compartment, as well as a fi set of unbreakab dishes. A_ speci place is intend for every artic! and it is claimed t! entire kitchen c: be packed and rea: ranged in its box 1 a few minutes.

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POPULAR MECHANICS 979 YZ Af ~ — One-Pound Subcaliber Gun Mounted on Top of Six-Inch Rifle in New Type Turret Used on Uncle Sam’s Fast Light Cruisers Training Sailors to Shoot Little Guns Fastened on Big Ones Save Uncle Sam Nearly $500 at Every Shot Fired during Preliminary Battle Drills tb. \INING Uncle Sam’s naval gunners light one-pound gun to the back of the for the big-time shooting, when the _ big guns, and an ordinary rifle to the back urteen, fifteen or sixteen-inch rifles of the one-pounder. A sailor straddle sh in thundering salvos, is a most -ex- the barrel of the big gun to load the one ensive pastime. It costs $500 to shoot pounder or the rifle, but from there on e of the big guns, or $4,000 for an eight the sighting and firing are carried out just in broadside. Then, too, the life of a as when the turret gun itself is fired. The 1ge rifle is ex- relative size of the iely limited, l only a very few ractice shots may e indulged in be- ire the gun must back to the indry for relin- But naval ex three guns, and the distance each wil fire, have been care fully calibrated, and targets worked out to the proper size and placed at the right distance that the sighting operations are the same for all three It costs about have solved problem of ning gunners nomically, and a crew may be two cents to fire rilled for months actual firing ictice for what it suld cost to shoot big rifle ju st rifle ind eight cents to shoot the one - pounde a compared to the $500 bill for the big e. They have fun, so that 25,000 troduced econ- rounds of rifle am into target munition or 625 ; = Firing a One-Pounder Mounted on a Thirty-Caliber os irk by fastening a Battleship Rifle one - pound she

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980 may be fired for the cost of one charge for the turret gun, not to mention the great saving in wear on the latter. Gun crews are not permitted, however, to waste even two-cent rifle cartridges or eighty-cent one-pound shells until they have had enough preliminary training to insure they will get some value out of actual firing experience. The training of the gun crews starts from the day a ship is commissioned. The gunnery officer culls the crew for the pick of the men, looking not only for the physical condi- tions but also for the mental qualifications that will make good gunners. With the crews thus picked, prac- tice starts with a dotter, a small device that fires a needle at a card. Everything about the dotter is on a reduced scale, but its mechanism is the same as that of a big gun, and even the firing trigger isa minia- ture copy. After the gunners thoroughly understand the mechanics of the piece and the mathematical factors that enter into its aiming, they are advanced to the big- gun turret, but only to fire the rifle that is attached to the back of the one-pounder mounted on the big rifle. When the crew become proficient with the small rifle, they graduate to the one-pounder, for more weeks of incessant drill, until finally they are ready to shoot the big gun for the first time. In the meantime every spare moment for weeks has been devoted to loading and sighting drill with the turret gun. Officers POPULAR MECHANICS with stop watches stand by and time ea movement, until the crew become so k ter-perfect and their actions so automat that the required speed can be maintain without a flaw. A moment’s confusion . a lost step in the co-ordination of the e: tire crew's movements might cause accident of serious consequences und: actual firing conditions. While the crews are drilling, the office assigned as target spotters have also bee: practicing daily to perfect their judgment of distances. The first drill is made wit a row of tiny targets two or three inch: square, mounted on the deck. The spott: lies down on his stomach, 200 feet or mor: away, and focuses his binoculars on th: targets, while a brother officer stands be side them with a stick wrapped in cotton The cotton is to represent the geyser o! water shot into the air by a shell whic! misses and plumps into the sea. The ma: holding it places the stick in various posi tions about the target and the spott« lying on deck calls the correction whic he believes would have brought the she! on the target. By the time the spotter h: trained his eyes, the gun crew is ready t: start subcaliber practice with the sma rifle and one-pounder, and the spotting of ficer graduates from his toy targets to th: somewhat larger floating ones used fo: these small pieces. His advancement keeps step with theirs until he is callin; shots on the big targets used for the occa sional practice with the turret guns. Gunner Sitting Astraddle the Big-Gun Barrel Loads the One-Pound Gun Which Is Pointed by Aiming the Five-Inch Rifle on Which It Is Mounted

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POPULAR MECHANICS 981

A Stick Wrapped in Cotton Represents a (|- = — i | $Shell’s Splash When | 70 7 =| Spotters Are Trained = mA Oe a - a by Calling Imaginary /| Ty O _ = — Shots at Tiny Deck L a a

"= Subcaliber Guns Mounted 24 on the Forward Turret Bat 4 teries of the U.S. S. “Utah,” Ps One of America’s Greatest Ve Battleships *

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982 POPULAR COIN RUNS ELECTRIC BOOT- BLACK TO SHINE SHOES An electric coin-in-the-slot shoe-shining machine has been designed for installa- tion on street corners, in hotel lobbies and public dressing rooms. The me- chanical bootblack may be resorted to as a timesaver at any part of the day or night. With the insertion of a nickel, the motor is turned on, dressing is applied to the Electric Shoe-Shine Vending Machine, That Is Op- erated by a Coin Inserted in a Slot shoe, and a neat polish produced by re- volving brushes. Only one foot can be placed in the device at a time. Handle- bars are provided so users can maintain equilibrium during the operation. FLYPAPER RAT CATCHERS TRAP PESTS LIKE INSECTS With the erection of countless big build- ings in the large cities and the continued destruction of old structures, expert rat catchers are called upon to combat the spread of rodent pests which do millions of dollars worth of damage each year to costly woodwork, wiring insulation and merchandise. While methods that have been employed to trap and kill the little animals for years still prove effectual in many cases, scientific means have been in- troduced by chemists and others in efforts to rid overrun areas. Rat boards, some- MECHANICS what resembling flypaper, which impris: the rodents in a sticky substance, are b: ing used with great effect. In a test « board a steamship infested with them, 1 rats were caught in one night. A doz were ensnared on one board which occ: pied no more room than an ordinary tra The expert trappers generally ply the trades at night, mixing and setting poiso especially devised to lure the animals i: festing particular districts. Before su campaigns are undertaken, the hunt: studies the area to acquaint himself wit the various kinds of food the rodents hav. been devouring, so the bait can be mad: as attractive as possible to them. Ferret are still widely used in killing off or dri ing rats from buildings. Hundreds « these wiry creatures are kept, and br: and trained by concerns specializing the work. In New York alone there ar about twenty-five firms, employing a larg: army of workers-who make a business destroying rats by both scientific and ol}: but time-proven, methods. BOTTLE OPENER WORN AS RING SAVES TIME AND TROUBLE Vendors of soft drinks at ball park theaters and similar places are spared cor siderable time and trouble in the caps from bot- tles by a ring- shaped opener worn on the fin- ger.. On the inner side is a notch which fits under the edge of the cap. A slight up- ward push is sufficient to re- move the top. The opener is always in position for use, saves time re- quired in handling or adjusting a tool that must be kept in the pocket and cannot easily get lost. It is also found convenient for home use a1 for camping and picnics. removin @The Popular Mechanics’ Bureau of I: formation offers its free service to a readers of our magazine. Names and ad dresses of manufacturers and dealers | articles described will be promptly fu: nished by addressing the Bureau.

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983 POPULAR MECHANICS SCHOOL FITS SENTINELS OF SEA FOR LIGHTSHIP DUTY len who guard ocean traffic from harm ing the perilous spots in Vineyard d are trained for their lonely calling lightship school where all the duties ightkeepers are taught them before are assigned to actual service. Not , is the important care of the lamps onstrated in every detail, but the re- and upkeep of a lightship and its rig x are thoroughly learned by the schol- Drills are also maintained for the pur- e of practice work by veterans of the ice in order to keep regular crews in «1 form for their tasks. After gradu r from the training school, the guards sent to stations along the sound where y take up their lonely duties of attend- to the warning lights and safety sig s of the sea. The men are made ac inted with the tactics necessary during eakish weather conditions, signal codes, d the rules governing ocean traffic ()nce assigned to a station, a guard is sel- im visited by other members of the serv except to provision the lightship and ieve the attendant at special periods.

e BOOKS WITH WOODEN PAGES TELL HISTORY OF TREES ound in timber covers and printed on ooden pages, a library of about 500 vol- ies at Cassel, Prussia, is devoted en / tirely to the subject of forestry, and by ff |

lustrations and text, describes the history the trees from which the collection was / made. Each book bears a leather tab giv- ng the name of the tree that furnished : e wood for its sheets and binding. In | | ite of the age of the volumes, they are | ; ell preserved and are considered priceless. /

oT

/ ’ ' 2 LF. d - * <¢ “ — _

< uardians of Ocean Traffic among Perilous Spots of Vine Practice Drill Aboard School Lightship Where G Sound Are Trained in Duties of Their Lonely Calling

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984 PORTABLE MOTOR-DRIVEN SAW SAVES HAND LABOR A portable motor-driven wood saw which may easily be moved about for any Cutting Small Lumber Sizes with Portab'e Mo- torized Saw That Can Be Used to Do the Work of Hand Tools work where the ordinary hand tool ts used, can be connected to a light socket for power. The machine is designed for service either on small buildings or houses or for medium heavy lumber where saving of time is important. The saw is of the disk type so arranged that the workman can handle small pieces of material with- out risk of injury. The device is also ar- ranged to operate by gasoline motor for use in districts where electric current is not available. AUTO ROAD ACROSS THE ANDES TO LINK ARGENTINA TO SEA Following the line of the new trans andean railroad that is literally being bored and chiseled into the steep ranges that divide Argentina from Chile, an auto- mobile highway under construction will be devoted to tourist and to heavy-truck traffic. One hundred miles of it already have been completed. The road was be- gun about twenty-five years ago, but rumors of war between the two countries halted the work and only a mule trail was finished. When done, road and railway will rank among the greatest engineering feats of the world. At points, an altitude POPULAR MECHANICS of 14,520 feet is reached, the ascent bei gained by circling between precipit« gorges and tunneling into solid cliffs. some places, it is necessary to travel eig miles to proceed only one mile. Flat, ba: ren plains on the mountain summits mor than two miles above the sea, give relic to the winding journey in_ straight stretches extending twenty-five and fort miles. More than 300 miles of the road lie on the Argentine side and sixty-fiv: miles are in Chilean territory. Narrow gauge railway and auto road will cost the former country about $25,000,000 and wi not be complete for three years. Ar American engineer is directing the work AUTOMATIC FEEDER FOR FOWLS PREVENTS LOSS OF GRAIN Chicken feeders that may be placed in lots with other stock, are opened by thx weight of the fowls and closed as soon a the birds leave, thus preventing hogs an cattle in the same lot from consuming the grain. The arrangement consists of a hop per with a trough on each side, protected by lids which are connected by levers with a shelf on which the chickens stand when eating. The weight of one is sufficient to raise the cover which automaticall closes when the fowl hops off. The in ventor found that the birds learned to us: this feeder in one day; it kept sparrow from getting at the grain and mash, and As Fowls Step on the Platform, Lid to the Feed Troug Opens Automatically solved the problem of giving his fowls special feed without keeping them in separate pen.

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POPULAR MECHANICS 985 Modern Theraputic X-Ray Machine, Inclosed in Lead Cylinder, with Single Aperture through Which Rays Can Fall to Reach the Patient Lying Below Handling Invisible but Deadly Rays Radium and X-Ray, Which Have Claimed Lives of More than 140 Scientists, Made Safe by Elaborate Precautions | ISPATCHES from France that Prof. Bergonie, of Bordeaux, is slowly ng a terrible death from radium burns, ntracted while treating patients, have ealed that the cause for which he and ore than 140 other experimenters with lium and the X-ray have laid down eir lives has been successful. No one living today, scientists declare, s suffered burns from either of the dan- erous rays during the last ten years, for e reason that the investigations of the ientific martyrs have made both safe to ndle. The patient being treated with dium for the cure of cancer or other ease, or being photographed or treated th X-rays, has never been in danger, be- use of the short period of exposure. ut the physicians and scientists and lab- ratory workers who were exposed day iter day for months and years to the rays aid the toll, until bitter experience taught the preventive measures. One of the greatest advances science has made is the substitution of radium emanation, or radon, for the pure radium salts in the treatment of patients. Only a few years ago radium, the most expensive substance known to man, was beyond the reach oi all but a few very wealthy groups of doctors. A tiny tube containing an infinitesimal amount of the substance —fifty milligrams—was worth $6,000, and every now and then the newspapers would carry accounts of such a tube being lost during an operation, or swept out by careless janitor. With the discovery that radium salts, dissolved in water with a slight addition of acid, gave off emanation in the form of a gas, which could be cap tured in glass tubes, the price dropped so that it is now within the reach of everyone A tube of the gas, about the diameter of! a fine hair inside and five-thirty-seconds doctors or

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986 POPULAR MECHANICS Giving an X-Ray Treatment, Above, and Right, Han- dling Radium While Sheltered behind Lead Shield of an inch in length, sells for $3, and is much safer to use. It can be planted right in the infected portion of the pa tient’s body and leit there, since it will exert its curative properties for about a month, and then becomes too weak to do any harm. In handling the radium and prey radon in laboratories elaborate precau ar tions are taken to protect the chemist The radium is dissolved in a small which could be held 1 the palm ot the hand \ lead-covered glass tube lead from the top of the fla | to automatic mer- cury pumps which draw off the emana- tion and the flask is then placed in a large sate, surrounded by a thick lead evlinder to protect people in the room from the ravs. Atter the tinv g! completed they are kept in a small lead iss tubes of fas are sate, with four-inch lead walls, until shipped. The ability of lead to check the activity of radium rays is as definitely measured as the life of the material As given off by the radium, the radon contains hy gen and oxygen. A, electrical heating in one tube conne to the pumps, bu the hydrogen while the oxyg. passes into anot tube, where it «¢ bines with chem to form water, I ing the pure radon t pass on into tit tubes, no thicker t a pin and with an side diameter the of a hair. The tubes are drawn to more than a me in length. WI about five inches the end has filled \ radon, the chemist plies a small jet, wl burns throt the tube, s¢ ing both e: The five-i1 m : j - piece containing radon. is then placed an ingenious machine with brass finge dividing five inches into thirty-two par \ gas jet behind the machine can moved back and forth by turning a wh: rhe chemist swings the gas jet to t space between the center fingers, two a

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POPULAR MECHANICS 7 alf inches from either of the tube, and burns lass in two, thus dividing radon into two equal Each of the parts is 1 burned in half, and each e quarters in half, and until the tube is re- to thirty-two equal These tiny tubes, so ll they can only be dled with delicate forceps, the radium “seeds” which sicians implant in infected ue to treat it. The radium mist places them in a box is lead safe, until ready hill orders and ship them. ey are then tested with cate instruments to meas- e their strength, | the required ount ordered by physician is ced in a small s phial, a half h in diameter an inch and a long. The ith is sealed by = ting it overa jet. The usual ( n, ed ~——— “a iking an ate Picture; the Apparatus in Front of ubject Is Fluoroscope 987 Automatic Pumps for Ex- tracting Radium Emana- tion; a Gram of Radium Is in Lead-Lined Safe at Left mailing package, unless instruments are required, is a simple block of wood, four inches square and five inches high, with a half-inch hole bored down the center. A bit of cotton is dropped into the hole, the phial follows, more cotton and a plug. The block ts then wrapped and a mailing tag added The progress in handling X-Rays and protecting the operator has been no less remarkable than the developments in radium research and use. Until the in- vention of the Coolidge tube in 1913 the X-ray operator could never be sure what his Crookes tube was doing, and many a1 operator, as a simple test, would place his hand before the tube and look at it through a fluoroscope. If he could the bones he knew the tube was working. The result such constant exposure, however, was burns, and eventually cancer or some other serious infection. With the invention of the Coolidge tube all doubt about the working of the machine van- ished, and with modern equipment the operator can work in an adjoining lead- lined room without danger. Machine for Cutting Tiny Radium-Filled Tubes Used in Internal Treatments sce ol

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Adjusting the Model Glider Plane to Its Rigging, from Which It Was Released as a Target for Anti-Aircraft Guns to Test the Efficiency of the Marksmen and Ordnance GLIDER LAUNCHED FROM PLANE AS TARGET TO TEST GUNS A target that tested the efficiency of anti-aircraft guns and marksmen without endangering the lives of pilots was pro- vided at a mock air battle at Fort Monroe in a small glider released from an airplane It was carried on a specially constructed framework upon the top wing. Atasignal, lever was pulled, the target, closely re sembling an “enemy ship” floated free and as soon as the plane was out of range shells from the guns began bursting around the glider, but it was not hit. The demonstration also involved the “bomb ing’ of the fort, dodging searchlights and dropping explosives on a land target paint ed to resemble the deck of a battleship FISH THAT CARRY OWN TORCHES ADD MYSTERY TO DEEP SEA Among the marvels of life in the ocean deeps are various kinds of fishes that carry their own lighting plants to illumine the dark waters and help them seek for prey They can turn the lamps on or off at will from mysterious internal “dynamos.”’ One’ specimen found three miles deep in the Pacific ocean had a sort of hinged lan tern light that could be swung over its back or in front of its mouth and, at the POPULAR MECHANICS —_ end, was a luminous lure or search! Other varieties have rows of lights either side and look not unlike s1 steamers with illuminated portholes, pa ing in the night. Further study of th submarine “electricians” is one of the ol jects of the expedition now at work the Sargasso sea. CLIP FOR SAFETY-RAZOR BLADES MAKES HANDY TOOL An inexpensive holder for discat safety-razor blades converts them int convenient tool for cutting cord paper or as a ping knife seamstresses. holder is light easy to handle is designed to « pose only one ner of the b! When the edge dulied, a new is exposed by versing the bl until all sides | been used. prevent accide the blade can be pushed back into a gu or withdrawn altogether when the kn is not required. a

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POPULAR MECHANICS 989 TRY TO MAKE SMOKELESS COAL TO PURIFY CITY AIR method for producing “smokeless from the ordinary bituminous prod- being sought at the University of s. The fuel is to be used in domestic ces and stoves, as it is the theory of cientists that these, and not factory ire the principal cause of air pollu- n large cities. Already, sufficiently quantities of the coal have been pro- duced for home tests, it is said. The rial is carbonized in vertical retorts e of a special alloy. In addition to the | coke by-product, a rich gas with er heat value than the common fuel, ew kind of tar, and oils that may be for running automobiles, have been duced in the experiments, according to rts. So far, no other than Illinois coal been subjected to tests. STREET-TRAFFIC SIGNAL HAND { TELLS TIME LEFT TO CROSS raffie-signal posts at a busy intersec- in Los Angeles not only tell which vehicles and pedestrians are to go, also indicate how much time is left crossing the street. s is accomplished a slowly moving which rotates kwise, covering part one sign as it un- ers the _ other. en it is time to halt, ell rings. iting Disk on This Traffic Post Covers Signs Slowly, Indicating to Motor- ist If He Has Time to Cross HOLDER FOR PHONE RECEIVER LEAVES HANDS FREE With a convenient holder for the tele- phone receiver, now on the market, a typist can use both hands in taking dicta- tion directly from the instrument and is spared the incon- venience of adjust- ing a bothersome head apparatus that musses the hair and Phone Receiver in Use, Allowing Stenographer Both Hands for Her Machine causes delays. The device consists of a bracket on an upright length of flexible cable that may be swung to various posi- tions. The rest is built into the same base on which the telephone stands and there is a weight for holding the receiver hook down when the operator has finished, thus making it unnecessary to remove the ear piece from its position. CIGARETS SMOKED IN MINE HELP DISCOVER ORE Over the entrance to the principal mine of a lead company in Arizona, hangs a portrait of “Antonio, the Cave Finder,” an employe who roams about the under- ground passages puffing cigarets. He keeps close watch of the smoke as it drifts away, and if he sees it dis- appearing through tiny breaks in the rock forma tion, the workings are ex tended in that direction which often leads to innet caves, rich in ore. Miner als in this region seem to have been deposited i cavities which lie in an ap proximately ] horizontal plane. The mine is said to have been enlarged by more than half a mile in this manner. Tunnels are driven under the caves and the ore is dropped directly into the cars that carry it out of the mine.

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For the Sick-Room or Any Window in the House, This Adjust- able Ventilator Allows Fresh Air to Enter without a Draft, Keeps Rain _ from Floors and Prevents Children from Falling ut Peeling an Orange or Similar Fruit without sreaking It and Losing Juice Can Be Done with This Cutter, Shown in Position for Grooving the Skin and for Pry- ing It Off ———— [=== @ 990 H Is Dave Dishes, s T ime Well; | It a Gent! F Table | Accessory and Bother in Passing Protects the ] a Revolving Center Board That Turns on Ball Touch and Will Dinner Service Time and Money-Saving Tools § for Above Is a Fue!-Savir Cooker in Which He Passes through Indent« Bottom and Is vented from Escanin by Asbestos-Lined To; Left, Combination F! Traveling Kit, f Comfort of Moth and Child, Has Out side Rubber Pocket for Holding Soiled Clothing and Carr Two Aluminum Ni ing Bottles with Ot! Articles Inside; It I Washable aes. Waxer and Polish

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ls for Woman’s Workshop in Home r Women Who Travel, Laundry Problem Is nplified with Trunk it Has an _ Ironing- Board Attachment, Easily t Up, Always Ready for e and That Takes Up Little Room Easily Clamped to Any Article of Furniture, a Holder Keeps Balls of Thread or Yarn from Getting Lost or Snarled and Can Also Be Used for String Foods Are Chopped egy with This Cutter with Revolvin ircular Knives and a Metal Guard That Fits over Them to Keep the Blades from Getting Choked; Below Is a Com- bination Cleaver, Pan Scraper and Meat Tenderer; the Head Turns on Handle Delicate Fabrics Can Be Safely and Easily Washed at ome in This Little Hand Machine Which Also Is Useful at Camp; It Can Be Packed in Small Space and Has Few Parts Painful Accidents in Pouring Boiling Water Are Avoided with Kettle the Lid of Which Is Weighted to Keep It On; It Was Invented by a Woman by addressing Bureau of Information, Popular Mechanics Magazine, Chicago &

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992 POPULAR EYE TEST GIVEN AUTO DRIVERS TO QUALIFY FOR LICENSE Owing to the belief that defective vision is the cause of many automobile accidents, Vision-Tester Employed to Determine Fitness of Auto rivers to Operate Cars the state authorities of Massachusetts re- quire applicants for drivers’ licenses to pass a thorough eye test. The examina- tion is conducted by a board of experts who employ special apparatus to deter- mine the sharpness of vision under condi- tions similar to those met with ‘in traffic. Tests for color-blindness, range of sight and other important features of the eyes are applied. Out of 443 persons examined, 382 were recorded as having normal vision, while the remainder failed to pass the tests. ORIENTAL RUGS TELL LEGENDS Aside from their prac- tical value as floor cover- ings, Oriental rugs play an important part in many social, political and religious the east, ceremonies in while the leg- ends and svmbols woven into their intricate pat- terns add to the fascina- tion of collecting and studying them. Some are manufactured for special occasions, as the holy carpet carried each yearfrom Cairo to Mecca to cover the caaba, the receptacle in which the sacred black stone of the MECHANICS Mohammedans is kept. It is retained one year, a new one being made to re; it and the old one cut up and sold t grims. From the design, the village y the rug was woven sometimes can he told, and symbols of good luck, he happiness, faith, strength, dominion vine wisdom and glory frequently are ‘ worked into the patterns. White a: { green express joy; white alone, mou ing; yellow, honor and distinction: and purple, dignity, while black s; darkness and trouble. WINDOW DISPLAY CHANGED BY TRAVELING SHELVES Moving show which continually have been invented. windows and _ shel change the displa Shelves attached a motor-driven chain go up from floor AIR the ceiling before the customer’s e move to the back and come behind display. If the device is used in a s] window, the descending shelves at back can be made invisible from the int rior, or concealed by curtains. The vice is intended for use both as a sh window attraction and as storage she in the store. In the latter case, ther no climbing to reach goods on she since the desired rack can be broug around and stopped at any point. G] Mechanism of Moving Show Window; Top, Settins Speed of Motion, and Left Display Shelves Ready f Operation

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POPULAR MECHANICS AIRPLANES LINKED TO BUS LINE GIVE DUSTLESS JOURNEY the end of a motor-bus route in Cal- ia, the call, “Change cars,” means a ible from the big road car to a wait- iirplane with pilot ready tc speed the ists over forest and desert to a lake up in the mountains. The state rail- commission has granted a permit for oint air and motor line, and the air te has been made doubly secure by tion of emergency landing fields with- e “dead” motor range of the plane. t is, there is a spot to land all along the within gliding distance should the es stop at any time. The scenic fea- of the trip by air are said to be tened by the panorama of orange es, vineyards and forest stretches, and line is expected to appeal to travelers ish to enjoy variety. GERM-KILLING POWER OF SUN PROVED BY TESTS vs of sunlight have been imitated and ted for their effects on various germs the bureau of standards. The beams, luced in small quantities and pro- 1 onto colonies of microbes, killed e of the germs in less than a second the light struck them. The different e lengths of the rays were measured the numbers of germs killed by them given time figured up for comparisons letermining the most effective beams germ-killing power of sunlight has known for a long time and is often oyed by housewives in “airing out” gs on bright days. The invisible rays believed to transmit the energies that oy some types of germ life. ter 993 Whisk Passengers High over Plain and Forest to a Mountain Lake, the Airplane, with Propeller Turning, Waits at the End of the Bus Line DESK HAS FIFTEEN THOUSAND PIECES OF INLAY More than fifteen thousand pieces of ivory, wood and pearl have been used in an inlaid desk set brought from Damas- cus. It is ornamented by paneled designs created with carefully carved bits of the various materials. There are more than = Set of Office F*:rniture Inlaid with More than 15,000 Pieces of Ivory, Wood and Pearl a hundred different kinds of wood in the set and it required two and a half years for the artist to accomplish the inlay work alone. The chair, desk and wastebasket which comprise the suite are well matched and of ordinary size. The patterns Cov- ering the surfaces show great skill in piec- ing and fitting the richly colored blocks accurately together. @ Eight states in this country are said to have more telephone instruments each than the whole of France

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994 POPULAR MECHANICS TRUSS ROD FOR ICE-BOX DOORS KEEPS THEM FROM WARPING Ice-box doors that have a tendency to warp because of the damp air, thus pre- Truss Rod in Place; Man Is Pointing to Sleeve for Tightening or Loosening It venting tight closing and a loss in effi- ciency of the cooler, can be kept in aline- ment or straightened with the aid of an adjustable metal truss rod attached to the inside. It can be tightened or loosened with a sleeve section that turns on threads and is strongly fastened with an upper and lower bracket, while the center part curves outward to form a handle that helps in using the door. ELECTRIC LAMP GIVES NO HEAT AND USES LITTLE CURRENT An electric lamp, invented by a French scientist, is said to burn without heat and glow for some time after the current has been turned off. Its secret lies in a fluor- escent substance on the outside of a vac- uum tube. The dim violet light in the interior of the tube causes this material to gleam brilliantly, and the illumination can be produced in almost any color de- sired and may be diffused to avoid eye strain. The lamp requires only a small amount of current, it is claimed. ARMY FINGERPRINTS FIND ONE MAN IN SEVEN MILLION The identity of any man who has se: in the regular army since 1906 can learned, and the entire record of the dier laid bare in from ten to twenty 1 utes, through the fingerprint system service has employed for almost twent years to register its members. More t 7,000,000 men have been in the army since the method was installed, but data for one of them can be located quickly comparing his finger marks with thos the files. The operation of the syste: so simple that, it is said, inexperie: clerks can accomplish successful sear: in a few minutes, after a short instruct Although there are on record more t 50,000 Smiths, 40,000 Browns and 28 Johnsons, it is claimed any one of t! could be easily identified by means of t fingerprint system, which also has used to expose frauds, to keep unde ables from enlisting, and to protect government against false claims. GRASS TRIMMER LIKE MOWER ELIMINATES STOOPING For trimming grass along walks, edg borders, around trees and other places : satisfactorily reached with the la mower, a machine that is pushed by ha: has been invented, doing away with necessity of stooping as in using sh¢ ora sickle. It is claimed that high as as low grass can be trimmed as fast as ' Trimmer in Operation Showing Clean Edge It Le Close View in Inset person operating the device can Strongly built of hardened material, saves time and labor.

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oi POPULAR = PU! ee i-Wrought Door of Iron; the Artist at His and Memorial Gates for Yale University Art Wrought in Iron Revives Forgotten Handicraft By FULLERTON WALDO | \M a blacksmith.” That is Samuel Yellin’s definition of himself. But | critics of art declare that he has re- ed a lost art in his poetic yet practical itment of wrought iron. He wrought table things for the Cathedral of St. the Divine in New York, for the J. rpont Morgan estate on Long Island, the memorial chapel at Valley Forge. itors to the Harkness quadrangle at e will not forget the gate with its fig- emblematic of the fidelity of Yale serving their country in the army, the v, the air service and the marine corps ring the war. hose who have felt the beauty and the tic quality of these achievements are turally curious to know something of personality behind them. Samuel n is a Pole, born in Galicia thirty- MECHANIC 995 eight years ago. From the first he was steeped in an atmosphere of creative handicraft. At seventeen he was gradu ated a master in ironwork after an ap prenticeship of five years. “My emblem is a hammer,” says Yellin. “When I go to Heaven I shall take ham mer and forge with me, and if St. Peter won't let me in, I shall make a key of mv own. “My little boy—aged six—inherits my own passion for iron. He runs about the shop full tilt wanting to strike at all he sees, and I have to keep on the qui vive to see that he doesn’t spoil things.

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996 POPULAR MECHANICS oe | ae Dy . co a, Pe Se ; rea vig hl be pats p | $e, pez Pas | Und Fess Wad “Some of my clients com: here with positive ideas, and down the law’ as to their wi If I think they are wrong, | fuse to give them what they » but when they see the fini product they are pleased— are glad I didn’t let them their way! “I work in iron in the belief I can say in it anything | No material is more plastic, : ductile, more expressive. S of my raw material I get Sweden; most of it comes western Pennsylvania. It ing process. I take it as I fin “I try subtly to vary a repe design; the difference bet the rigid forms of cast iron my work partly appears in t! irregularities, and the delibe unevenness. Here a point i ward, and there it thrusts d ward. Here a curve is out the next is inward. The man in making a successio vertical panels or a numbe: bosses, or finials, is not doing Iron Gates Erected to Honor War Service of Men of Yale Uni- z versity in Which Variety of Design Lends Beauty to the Pattern over. “It is my ruling passion in life to found a school of workers in iron. I find in the handicrafts today so much that is false, so little that is real. There is so imperfect an understanding of the limitations of mate- rial, and so faulty a recognition of the fact that one substance is the suitable medium for expressing certain ideas while another medium should be chosen when the ob- jective is different. “This is true even with some architects who should know better. TRAFFIC STOP SIGN OF RUBBER SAVES REPAINTING COSTS To do away with constant repainting and replacement of traffic markers, a rub- ber stop sign which can be fixed on end in the street paving, bends under wheels of vehicles when they come in contact with it. While avoiding breakage, the flexible na- ture of the signal permits it to be placed where drivers cannot fail to see it. Re- sembling a metal sign sticking up in the middle of the road, its presence also causes many motorists to slow down to prevent running over the object, though it cannot be injured or damage tires. Almost any same stereotyped thing over Only the unperceptive ask me why I avoid making e leaf in a foliated design just like e other leaf. Infinite variety gives lif the pattern, be it large or small. “Nor is the mottled effect where hammer has fallen an afterthough the sake of appearance. The marks oi implement are not added subseque: they are incidental to the working oi iron. I will not have in what I make thing that is for show; it must be rea the material itself, coming from the frame of the earth, is altogether re inscription may be placed on the which is said to withstand long wea: 3 Rubber Traffic Sign Installed in Street Paving passed through no special refi

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POPULAR MECHANICS 997 BOAT RIDES ON BUBBLES AND IS DRIVEN BY AIR Boat in Action > > AIR ESCAPING THROUGH EEE FINE HOLES= — Bottom View of Model Show- ing Air Vents, and the Real THESE AIR JETS DRIVE THESE BOAT AHEAD BO Compressed air has been used at various times for many years as a means of pro- pelling a boat. AIR JETS DR AT ASTERN the backward Diagram of Boat’s Construction and Path of Air That Pushes It Forward or Back lriving a thirtv-three foot boat with a 1 one-half foot beam at a speed of ne miles an hour, yet using only three sepower to do it, is claimed for a new pressed-air propelling system devel- ed by an Australian engineer in Eng- |. The unusual boat, when under way, les on a cushion of air, eliminating much the friction between boat and water, ich must be overcome with ordinary sels It is likewise claimed that the cushion has a tendency to prevent ac- mulation of barnacles on the hull in salt ter. The bottom is almost flat, and the re after section is pierced by rows of holes, through which the jets of air pe. Each row of jets is separated its mates by fins, extending back- rd, to guide the air as it pushes aft and its force exerting a forward push. e forward half of the hull bottom has ew jets and fins, arranged in the same inner, to be used in reversing the craft. ind pressure of the escaping air be ing utilized in all cases to drive the vessel. The latest craft has the advantage, it is claimed, of de veloping greater speed in proportion to weight and because the cushion formed by the air escaping from the openings in the hull lessens resistance by about two-thirds. A larger boat em ploying the same system is planned. horsepower, ELASTIC LACES FOR SHOES Shoe strings made of a rubber compo sition and recently introduced by an English manufacturer are said to stretch so easily that shoes can be taken off o1 put on without unlacing them. The strings are fastened at the top on the in side, thus eliminating the need for tying or knotting, and they cannot work loose In games or on hikes, the elastic laces are said to relieve the pressure of the shoe on the foot. They are made in different colors.

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998 POPULAR MECHANICS TOWER ERECTED TO ELEPHANT STUDDED WITH IVORY TUSKS One of the landmarks in Bombay, India, is a ninety-foot stone tower studded Tribute of an Indian Rule: a Tusk-Studded with ivory tusks a1 graceiul dome above latticework. It is tl of the favorite elepha ruler, and evidences the high esteem these faithful animals sometimes win in the hearts of men. In addition to their value as beasts of toil and burden, they are of- great Service on tiger hunts, and it is not unusual to have sixty or more elephants in one expedition. They have become even more. popular with the advent of the motion picture, for the camera man has opportunities for “shots” at tigers in the long grass in which they hide, while riding safely on the back of his elephant. When the big beasts are wounded in encounters with the prey, their keepers carefully dis- infect and treat the injuries, for the ele- phant appears to have little resistance against illness. WAR CAMPS EFFACED BY HOMES AND INDUSTRIAL CENTERS Army cantonments used during the great war to train the country’s milli: of soldiers are being rapidly converted : attractive residential communities and dustrial centers. The general layout most of the military posts makes the ar: readily adaptable for use as parks, build- filled with a reeu- lar pressure gun and is so con- structed that the road shocks and vibrations drive a piston in the cup against the lubri cant and force it into the supply chamber as it is needed. The position of the stem at top indicates how much oil is carried reserve and the cup fits any standard s) tem. It is designed to reduce repair bi and replacement expense on king pins a spring shackle bolts.

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A Long-Distance Portable Receiver \ ORTABLE receiver for the auto- A obile tourist or other traveler, with n. loud speaker, all complete for a { $75, including tubes and batteries, latest product of the Popular Me- . chanics radio laboratory. it of standard parts which can be ob- GES SING By F. L. BRITTIN home, too. The small built-in loud speak er, of course, has not as good tone as a larger unit; so the speaker connections are arranged in such a way that they can be disconnected quickly and a larger speaker or phones connected. All that is necessary is to pull one set of cord tips out another pair e 85-ft. aerial with two in nd. In use, e drawn over ‘owing a cord ¢ the branch, vulling- it up. vith ome end ed and tapped binding post, »d temporary 1e auto camp. rd case, 143, ligh, 16% in. and 6% in. , is used. The lite or for- a instrument 1 is %s by 7 by 2in. The ar ement of the uments on panel is clear hown in the ‘ration. The or subpanel akelite or ica, %e by 5 Rear View of Instrument Out of the Case, Showing How the Tubes Are Mounted 1003

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998 POPULAR TOWER ERECTED TO ELEPHANT STUDDED WITH IVORY TUSKS One vof the landmarks in Bombay, India, is a ninety-foot stone tower studded Tribute of an Indian Ruler to His Favorite Elephant, a Tusk-Studded Tower in Bombay with ivory tusks and surmounted by a graceiul dome above a railing of delicate latticework. It is the monumental tomb of the favorite elephant of a famous Indian ruler, and evidences the high esteem these faithful animals sometimes win in the hearts of men. In addition to their value as beasts of toil and burden, they are of° great Service on tiger hunts, and it is not unusual to have sixty or more elephants in one expedition. They have become even more, popular with the advent of the motion picture, for the camera man has opportunities for “shots” at tigers in the long grass in which they hide, while riding safely on the back of his elephant. When the big beasts are wounded in encounters with the prey, their keepers carefully dis- infect and treat the injuries, for the ele- phant appears to have little resistance against illness. MECHANICS WAR CAMPS EFFACED BY HOMES AND INDUSTRIAL CENTERS Army cantonments used during the great war to train the country’s milli: of soldiers are being rapidly converted | attractive residential communities and in dustrial centers. The general layout most of the military posts makes the are readily adaptable for use as parks, build ing and manufacturing sites. Many ha preliminary improvements already stalled, requiring little preparation to meet the needs of home builders and factori: Camp Bowie, near Ft. Worth, Tex., n: accommodates a community of seve: thousand bungalows, forming a popula: residential addition to the city. Car Logan, near Houston, and Camp M Arthur, at Waco, also have been convert ed into fashionable residence district Flying fields and aviation camps, becaus: of the buildings required by the air ser) ices, serve as admirable sites for indust: concerns, the hangars and shops affording valuable structures for housing comme cial establishments. A large fextile plant almost entirely occupies the ground where Love field stood, near Dallas, a Barron field, in the neighborhood of F: Worth, is a busy colony of many different industrial concerns. AUTOMATIC CHASSIS GREASE CUP HOLDS SIXTY DAYS’ SUPPLY Squeaks and rattles in the automob chassis are said to be eliminated quic! and effectively with an automatic grea cup to supplement the regular lubri- cating system and which holds a six- ty days’ supply of semiliquid grease or heavy oil. It is filled with a regu- lar pressure gun and is so con- structed that the road shocks and vibrations drive a piston in the cup against the lubri- cant and force it into the supply chamber as it is needed. The position of the stem at t top indicates how much oil is carried reserve and the cup fits any standard s\ tem. It is designed to reduce repair bi! and replacement expense on king pins a spring shackle bolts. a

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A Ct } temporary f he stations e n, Nebr., \\ p rt ile intended an | rer A Long-Distance Portable Receiver By F. L. BRITTIN YRTABLE receiver for the auto- ‘bile tourist or other traveler, with n. loud speaker, all complete for a $75, including tubes and batteries, latest product of the Popular Me- s radio laboratory. t of standard parts which can be ob it most radio stores and housed in lard, leather-covered sample case— | that is built in quantities for trav- ilesmen—the entire outfit weighs » lb., is less than 15 in. high, by 161% and 61% in. deep. te its compactness, the set is se- nough to tune out a station with movement of the dial and covers ‘tionally long range for a portable tube receiver. In nder favorable Chi- nditions, using an aerial ft. ground with good on the included Springfield, K FAB, BAP, Fort hb, eee ly for the the set is 1 for use at home, too. The small built-in loud speak- er, of course, has not as good tone as a larger unit; so the speaker connections are arranged in such a way that they can be disconnected quickly and a larger speaker or phones connected. All that is necessary is to pull one set of cord tips out of the small jacks and insert another pair For use as a portable set, the 85-ft. aerial is carried wound on a spool, with two in sulators handy for either end. In use, one end of the aerial can be drawn over the limb of a tree by first throwing a cord weighted with a stone over the branch, attaching the aerial, and pulling: it up An ordinary curtain rod, with one end sharpened and the other drilled and tapped for a small binding post, makes a good temporary ground for the auto camp. A standard case, 1434 in. high, 16% in. long, and 6% in deep, is used. The bakelite or for mica instrument panel is “6 by 7 by 157442 in. The ar rangement of the instruments on this panel is clear ly shown in the illustration. The base or subpanel is bakelite o1 formica, “6 by > Rear View of Instrument Out of the Case, Showing How the Tubes Are Mounted

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1004 by 152442 in. The front panel is mounted on the subpanel by means of three small brass brackets, and is set 1% in. back from the front edge of the base to allow clear- ance for the dials and rheostat knobs when the lid is placed on the case. The instru- ments are mounted on the subpanel with -in. 6-32 brass machine screws, in the positions shown in the diagram. The universal-coupler unit at the extreme right is secured on the subpanel with one ma- chine screw, so that it can be turned at an angle that will give the best results. Flexible wire must be used for the con- nections leading to this unit to permit this rotation. The correct adjustment cannot be obtained until the set is completely wired. The other instruments are set up in the order shown in the diagram: the tube sockets, of the shock-absorber type for UV-199 and C-299 tubes, are mounted on a strip of bakelite, 46 by 1% by 157% in., and the bakelite strip on two brass brackets, *32 by 4% by 3% in. high, which are screwed on the base in the position shown in the rear-view photo. This places the tube sockets just above the transform- ers, and should be just the right height to allow the tubes to clear the top of the case when placed in the sockets. The set is now ready to wire.” Use rub- ber-covered wire of the flexible stranded type, obtainable from any electrical dealer. It is especially useful in portable receivers, where flexibility is one of the factors that makes for successful operation, due to the fact that tubes of the dry-cell type must be used, and all jars and vibrations should be minimized by flexible wiring and shock- absorber sockets, to eliminate microphonic noises in the horn or phones. It will be noted that long leads for the 76-volt positive B, positive A and nega- tive A, are taken through the subpanel to the battery compartment below the in- strument. The positive-A and negative-B terminals are connected together at the batteries. The A-battery consists of three No. 6 dry cells connected in series; the B- battery of three No. 3156 Burgess 22%- volt units. These units are also connected in series. Two brass brackets, formed from “6 by 1-in. brass angle bar, are screwed to the inside of the case on each side, 644 in. from the bottom of the case, to support the panel of the instrument, and a third bracket, cut from brass angle stock M46 by 1 by 5 in., is mounted inside the case at rear to support the back of the base. The height of these brackets must be carefully determined to allow the front of the base to rest on the wood panel in the front of the battery compartment. POPULAR MECHANICS This wood panel is % by 6'e by 152%e in. and may be of either poplar or basswood It should be stained, and several coats of good varnish applied, rubbing down eac! coat with pumice or rotten stone. A hole 3% in. in diameter, is cut in this wood panel to take the bell of the hard-rubber horn, which is secured to the rear of the panel by means of a block of wood, 3% by 13g by 1% in. high. This block is recessed to hold the end of the horn in position, and a strip of brass, 4s by % by 6 in., is bent into a bracket around the horn and block, then screwed to the rear of the panel, making a solid mounting for the horn. A horn of this size does not come equipped with a loud-speaker unit, but the base cap can be furnished by the man- ufacturer for most of the standard units A Baldwin type-C unit is used in the horn illustrated. The cord from the unit is brought through a hole in the panel, for connecting to the cord-tip jacks in the front of the instrument panel. A smal! hard-rubber bushing of the type used in electric-light fixtures is set in the cord hole in the wooden panel. The instrument is now ready to test Make this test before placing the instru ment in the case. Connect the A and B- batteries to their respective leads and place the tubes in the sockets. Connect to the aerial and ground, use a pair of head phones and make the adjustment of the universal-coupling unit before placing the instrument in the case. First tune in some near-by station to maximum strength. Then, listening in with a pai of head phones, turn off the first rheostat at left entirely. The signal will probab still be heard, owing to the coupling bh tween the universal couplers. To eli: nate this, rotate the first coupler slight! When a position is finally found where no signal is heard, fasten the first couple: permanently and do not disturb it agai: Now to mount the set in the case. Y: will note two screws in the top of the i strument panel; these two black-finish brass screws are 6-32, % in. long, a1 screw into the two small brass ang| brackets, threaded to receive them and mounted on the inside of the case near t! top. Disconnect the batteries, put t! instrument in the case, reconnect the ba teries and the set is ready for use. signal Tuning the Set 1. See that good contact is made on crystal detector; it may be necessary screw the little knob all the way in to g a good contact; then back off the kno) until the signal is clearest. —.

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POPULAR MECHANICS 1003 1005 Left, Lower Panel Removed to Show Arrangement of ries; Upper Right, Back of Wood Panel; Views of the Complete Receiver [urn up the rheostats about halfway. urn both dials slowly in the same tion and keep them at about the same ng. Listen carefully in the head es, and when a signal is heard, turn dial separately ts the point where the il is the loudest. \djust the contact on the crystal de- rr until it is at the point of maximum tiveness. urn the rheostats down, if neces- , to get the clearest possible tone. ) get the best possible results from the iment, learn to control properly the perature of the tubes, by adjusting rheostats, for best volume and clarity one. Try interchanging the tubes, for Below, Two there is variation in the electrical constants of different tubes, even of the best makes. Reasonable care should be taken with any portable set not to subject it to hard knocks or falls. See that the A and B-batteries are strapped together and secured in place in the case, before taking the tnstrument on atrip. We have subjected this instrument to a great deal of rough treatment, and it continues to work nicely, so we do not hesitate to rec- ommend it to our readers. he instru ments are contained in one standard kit, easily obtained anywhere, and the builder is not obliged to hunt for parts to com plete the set. Free blueprints of this set, showing all details of construction and a full list of materials, may be obtained from the Radio Department, Room 515, 200 E. Ontario St., Chicago. cents, to cover the cost of mailing. The only charge for this service is

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"THE wiring of a homemade receiving set seems easy, and there is nothing really dificult about the job, but there are a number of little points that should be ob- served if the finished set is to be an object of pride to the builder—and what radio fan is there who builds a set without de- termining that it is going to be the best set that ever was made? This article does not pretend to cover the whole subject of set wiring, but if it helps the reader to build a better set and makes the building a little easier for him, it will have achieved its purpose. The first question that comes up in the mind of the builder is: What kind of wire shall I use? There is no definite answer to this, as so much depends on the taste of the maker and the design and pur- pose of the set. If the set is a portable one, for example, and is built so that the interior is not ordinarily exposed, then flexible stranded wire, rubber-covered, will be found ideal for the purpose. A set wired with this does not look as well as one wired with the ordinary busbar wire, but, on the other hand, the job can be done much quicker, as one does not have to be so careful to make nice bends. Also the flexible wire is non-microphonic, and this is an advantage in any set. The or- dinary set, however, is built in a cabinet, with a top that can be lifted to give easy access to the interior. Everyone that looks at the set lifts the top to see the “works,” and the builder naturally wants the wiring of the instrument to look as wellas it can be made to look. The choice of the wire then falls between round and square busbar. The square wire is a little stiffer, and some think it makes a neater job, but I prefer the: round variety. The wire is a little harder to straighten, as it comes in coils instead of in straight lengths as does the square wire, but it can be done. It will be found that spaghetti can be drawn over 1006 the round wire with much greater facil than over the square, and if much of the tubing ig used in a set, there is a great saving of time here. Also, in confined places in the set, the round wire is m easier to bend into shape with the fing and the appearance of the set can be made just as good, with a little care, as w! the square type is used. Next comes the choice of a solder iron. If the reader expects to make ma: sets, it is well to get two, one light the other heavy. Of course, the best type to use is an electric iron, but, if electricit) is unavailable, good work can be d with a plain one. -This can be heated means of a blowtorch, as shown in Fig 1, which, incidentally, shows a very g¢ holder for the soldering iron, made f a length of busbar wire and a piece wood. If a blowtorch is not at hand, t iron is heated on the oil or gas stove means of a Bunsen burner, or even a tin of “canned heat.” will serve nicely for the electric iron prevent the top of the table or bet from acquiring ugly burns. The he iron is shown in use in Fig. 2, on joint that are in the open, and this iron serve for a majority of the joints in a However, there are places, as in Fig where the handiness of the small iron be appreciated. It but one or two sets to be made, the small iron, which co about $1.50, will serve very well. smaller irons “burn” away rather fast left switched on for long periods, so ¢ } should be taken to switch them off whe not in actual use. No soldering iron will do its work w if it is not tinned properly and kept tinn Heat the iron, taking care, if it is a p! one, that it is not brought to a red he and brighten the point with a file as sho in Fig. 4. Spread some flux on a sh of copper, brass or tin that has been p The same holder

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POPULAR MECHANICS 1007 |, and rub the bright point of the iron the fluxed surface, applying some r to the point while doing so. This coat the point with a layer of solder e point is hot enough) and this tin- t must be preserved while the iron is u [If a plain iron is overheated the ng will be burnt off and must be re- d. With an electric iron no atten- need be paid to the proper heat, as it esigned to keep at this temperature matically. quantity and kind of flux used in g¢ a radio set are very important. As t ire used is tinned and the wiring lugs ( e instruments are usually tinned also, a great deal of flux is necessary in ng joints. Never, under any circum- es use acid-core solder or an acid Rosin-core solder may be used, al- in Popular Mechanics radio lab- ry, a good non-acid paste flux is pre- d. This is applied very sparingly to oint, and care is taken that none of eeps under the lugs when the solder- ron is applied. If rosin-core solder ed, be very careful that all trace of the is cleared from the joint after solder- as we have seen radio sets that re- | to work simply because some rosin the solder had happened to find its under one lug. Vhen using solid wire, it is advisable to e as many of the bends before the | ae the End of the Soldering Iron with a ile in Preparation for Tinning Tinning the Iron on a Polished Metal Plate with Flux and Solder = Upper Left, Using Soldering, Lugs and Mounting Grid Leak; Upper Right, Bending Solid Wire; Below, ear View of Set Showing Uses of Soldering Lugs

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1008 POPULAR wire is put in place as can conveniently be done Che bends should not be sharp but rounded somewhat. The best tool for this purpose is a pair of round-nose pliers, or one of the plierlike tools used for forming eyes in the ends of wire. This is shown in Fig. 6. Soldering lugs should be used under every terminal in the set. These can be bent and twisted in any way to suit the wiring. For instance, in the upper left corner of Fig. 7A there is a drawing of a lug under a socket terminal that has been twisted at right angles and the wire run through the hole; this permits one straight wire to be used for either filament lead. In the right-hand corner of the same drawing is shown a lug bent up at right angles to catch a wire running across the terminal. Fig. 7 shows a set in which lugs have been used under the terminals, and the many ways in which they can be bent to suit the wiring and eliminate extra joints. Fig. 7A also shows a very neat way to mount a gridleak and condenser on a transformer; the terminal posts of the transtormer pass through the holes on MECHANICS the condenser, and the terminal nuts | it tight as well as make the desired con nection. A grid condenser mounted i: ordinary way simply hangs on its conne ing wires, and this is not a very satis{ tory method of supporting it. W1 using lugs, always cut off the project ends of wires that pass through the holes. This is easily done with a pair end-cutting pliers, and adds to the appear ance of the set when completed. The commonest joint between wires a radio set is a T-joint, where two wire meet and are connected at right angles t each other. There are three methods making such joints, and these are show in Fig. 9, that permits the user to make a very gox d e in Fig. 9A shows a T-connecto: joint, and also eliminates the trouble of holding the wires while soldering. T| connectors can be obtained for a few cent a dozen in the radio store. To use, t connector is pinched around the wire shown in the lower illustration at A, | 9, and the joint soldered. Another met is shown at B, Fig. 9. Here one end FIG.3 \ ~ FIG.2 Two Types of Electric Soldering Iron, Showing How Each Is Used; Below, Method of Heating Plain Iron, and Simple Stand e

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POPULAR MECHANICS 1009 COPPER LUGS THE RIGHT WAY SO THE WRONG WAY SOLDER |; BEND CLAMP WIRE AROUND COVERING HERE FiG.i2 Cutting Off Ends of Wires; Proper Methods of Making T-Joints in the Wiring; Twisting the Ends of Flexible Wice and Jointing It; Finishing Ends of Connecting Leads and Correct and Incorrect Ways of Soldering Wires to Nuts

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1010 POPULAR MECHANICS one wire is bent at right angles and butted against the other wire and the joint is then soldered. At C, one end of one wire is simply butted against the other and enough solder run around it to make the joint secure. The first method makes the best joint, but, in the absence of the con- nectors, the second method may be em- ploved, and is preferable to the third. The bent-end joint (B) is not so neat in ap- pearance as that shown at C, but it is the better joint. Remember that the purpose ot the solder is simply to preserve a good joint, not primarily to make one. The wires should touch each other over as large a surface as possible. This is the real joint, and only enough solder should be used to insure that the contact of the wires will be preserved. Remember also that the solder is a much poorer conduc- tor than the wire, and do not depend on a blob of solder to make a contact; it will make a contact, but not such a good one as the wires themselves. When using flexible wires, be sure to twist the bared ends as shown in Figs. 10 and 10A. If cotton-covered leads are used anywhere in the set, the ends of the FIG. 16 A Upper Left, Tightening Terminals per Right, Cleaning Terminals and | fraying further, after the are bared, by simply applyi: drop of collodion to the e: the insulation. When making joint flexible wire, make them as shown in 11, not as in Fig. 9. of one wire around the bared spot o: other before soldering. Leads that must be connected and connected frequently should be prov with copper lugs on the ends, as show Fig. 12. Two types of these lugs available, with and without clamps. W using the former, the end of the wi: passed through the hole in the lug soldered to it; with the latter, the en the wire is passed through the hole as fore, and the wire is pulled far enoug bring the clamps on the lug over the « of the insulation. The clamps are bent tightly around the insulation shown in the lower drawing, and the soldered. The clamps take a great of the strain on the wire and also pre fraying of the insulation. Sometimes it is necessary to soldet rectly to nuts without using lugs. ber the previous warning and make joint as shown in the upper part of Fig Bend an eye on the end of the wire t Below, Tool for Skinning the End Flexible Wire and Manner of Usin; insulation can be prevented f: Twist the bared « solde: When this must be done, rem: Tr 1

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em" POPULAR MECHANICS tly over the projecting screw and then er. Don't lay the wire on top of the and solder as shown in the lower This will make a joint, certain- ut a very poor one. \fter all the wiring is done, go over ery terminal on the set (Fig. 14) and see they are tight, but, before doing this, e off the terminal nuts on all instru- nts, lift the lugs off carefully so as not ut any kinks or bends in the wire, and over the terminals and the surfaces of lugs with a rag moistened with alco- (Fig. 15). This will clean off any trace flux that may have crept under the it only takes a few minutes to do but it may save trouble later on. \ very useful tool when working with xible wire is shown in Figs. 16 and 16A. is is a common kitchen paring knife a couple of notches filed near the ing. Lettering on Panels [f one wants to finish a panel without iting for the engraver, or whenever ne is unable to have a panel engraved, e job can be done at home. The sur- ice should first be cleaned with alcohol ) remove the film of dirt and grease; the ttering can then be done with a fine ttering pen, using thin Chinese white else draftsman’s white ink. The letter- ng must be allowed to dry thoroughly nd then given a coat of transparent var- h, using a soft varnish brush. Novel Loud Speaker Entirely different in design and oper- tion from instruments of the conven- nal type, a new “hornless” loud speaker has been de- veloped by a Chicago in- ventor. In- stead of a single more or less. straight passage for the sound this type provides a zigzag path from the cen- - outward, the total length of travel be- ng 42 in. By this construction, the in- ‘ntor claims, the tone reproduction is mproved and the range of audibility en- irged so that persons sitting anywhere round the instrument can hear as well those in front of it. Compactness is n obvious advantage of the speaker. U. &U. 1011 handle end of the blade. The edges of the notches are filed sharp, and each notch must be just deep enough to cut through the rubber insulation on the wire it is in tended for without severing any of the strands of wire. The manner of using the tool is shown in Fig. 16. It is used near one end of the table; the notch is brought down over the wire at the proper distance from the end and the wire revolved be tween the fingers so that the insulation is cut all around. The wire is then pulled out, still keeping the knife pressed down on the table; this strips the insulation from the wire and leaves the end bare. ready to twist. The whole operation is done in a fraction of the time it takes to describe it, and anyone who has skinned the ends of a number of lengths of wire by the ordinary method will appreciate the time saved by this simple tool. B-Battery and Charger in One Unit An alkaline B-battery with a recharger, built in one unit and assembled in a neat is one of the latest solutions 12-in. cabinet, Front View of the Combined B-Battery and Recharger Note the Compact Control Panel offered for the battery problem. Danger of acid boiling over has been eliminated by using alkaline-salt solution in the and it is also claimed that there is less wear on the battery elements, which are said to be practically free from shedding and buckling, while sulphation of the plates is impossible. The combined bat tery-recharger is guaranteed to have suf ficient capacity to handle the heavy drain of the superheterodyne or other multi- tube receivers. cells,

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1012 POPULAR M Using Loop with a Neutrodyne Many readers who have a neutrodyne set will no doubt wish to use a loop in- stead of an outdoor aerial. A simple one to construct is shown in the illustration. 12 TURNS OF ECHANICS on opposite sides at one end, to hold the wire, and the inner ends are screwed into a gas-pipe cross. Number 22 d.s.c. wire is used and six turns are wound on each side. The loop is held up, yet permitted to rotate freely, by inserting the 17 stick into a floor socket, which is bee wike. NO.22 — —— screwed on a wooden base. Bot! EACH sticxs **+— 17 —| ends of the wire are connected to Sipe . Ih oon _ eee a variable condenser of .001-mi GAS-PIPE Wf cc - =a Capacity, which is equal to that of ae ~~ ae ous any 23-plate condenser. From the A Yi condenser terminals leads are Uf _ SAW CUTS brought out to the receiving set ~ FOR WIRE and connected to the antenna a ground binding posts. The three diagrams given in th. TUNER OER. lower part of the illustration sh: several other methods of hooki: up the loop to the instrument with and without the condense: Each hook-up should be tried separately to determine whic! VARIABLE CONDENSER -OO! MF. a ¥ VAR. COND..OOIMF. A Neat Homemade Loop Aerial and Three Hook- ~- for Connect- ing It to a Neutrodyne Receiving It consists of four pieces of broomstick, cut to the lengths indicated in the upper right-hand detail. Six saw cuts are made Adjustable Detector Replaces Crystal and Catwhisker A detector that replaces the ordinary crystal and catwhisker, and eliminates the constant adjustment necessary in most reflex receivers, can be quickly reset with a common pin. The device requires no bat- teries and can be either fastened to a panel or connected to a pair of wires without mounting. It may be used as part of any crystal or reflex set and is claimed to work equally well in any position. A small hole is provided in the side of the tube for the insertion of a pin, when it is desired to VNMOUNT, MOUNTED works best; this varies with dit ferent sets. The first figure at t! left shows one end of the | brought over to the antenna bin ing post, while the other end the loop is open. A separate co: nection is made from the instr ment to the ground. In the cer ter figure the variable conden: is inserted in the lead from t! loop to the ground binding po of the receiver, while the othe: end of the loop is connected the antenna binding post. In t! right-hand figure both ends oi t loop are connected together and then ru over to the antenna binding post.—F. | srittin, Chicago, III. readjust the detector for increasing volume of the set. It is easily instal and, when once adjusted, is said to p duce smooth, uninterrupted reception Direction of Aerial Has Effect All aerials are somewhat directional effect, although the loop is popularly su; posed to be the only antenna that has t! property. If the radio fan will bear t! fact in mind when erecting his aerial may increase the efficiency of the set. F example, if the majority of the broadca ing stations that he expects to receive 4 to the north of his location, and he erecting a single-wire antenna, the aer should point north and south, and t lead-in wire should be taken off the nor! end, that is, the end nearest the statio:

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ff MECHANICS Fixing Doorbells and Buzzers By E. R. HAAN ‘) [f° ordinary troubles experienced with Both operation and construction are ectric doorbells or buzzers can easily easily followed by reference to Fig. 1, ken care of by the amateur without which shows a battery-operated bell. Two ¢inanexpert. All that is necessary dry cells are connected in series, that ts, ittle knowledge of the operation and the center terminal of one cell is connected truction of the apparatus and the to the side terminal on the other cell, and to handle such common tools as of the two remaining terminals one is vdriver, a pair of pliers and a knife. brought to binding post H on the bell and —) Household Doorbells and Buzzers Can Easily Be Repaired by Any Amateur. Fig. 1 Shows the Actual Connections of a Simple Doorbell Circuit and the Mech- anism of the Bell 1013

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1014 the other to one of the push-button ter- minals, while the other terminal on the push button is connected to the binding post A. By pressing the push button the electric circuit is closed and the bell rings. The current passes from the cells through the push-button switch to A, and through B, D, E, F, G and H back to the battery. These parts are respectively: B, the elec- tromagnet; D, the armature; E, spring on armature making contact with point of screw G (which is held in bracket F). What happens when the current flows is that the cores in the electromagnet attract for a moment the armature and the hammer on the latter strikes the bell, but at practically the same instant contact is broken at E and F and the current flow stops, releasing the armature; however, only momentarily, for, so long as the button on the switch is pressed, current pushes on from the battery through A to the electromagnet, and the same thing happens over again so rapidly that the hammer strikes the bell with scarcely per- ceptible intervals. Therefore, when no bell is used, the apparatus is called a buzzer from the sound it produces. A light spring under the armature on pivot C aids this rapid back-and-forth move- ment. The amateur repairman can make all this much clearer to himself by pro- viding himself with a secondhand doorbell and connecting it up as shown. Also take apart and dissect the push-button switch. Although the experienced electrician may be able to locate certain troubles im- mediately, the amateur, to save time and to learn faster, had better work system- atically, beginning, when the bell system does not work right, with the batteries. These may be dead or exhausted, and this is the commonest “trouble” encountered. It is easy to test the cells with a lamp from a small flashlight, but the cells show de- cided symptoms of exhaustion several weeks before they actually go dead, the action of the bell becoming weaker and weaker every day. One can then deal with the exposed parts that can be examined without disassembling, that is, the wires and their connections at the cells and the bell base. Ifthe binding posts do not hold the wires firmly, tighten the screws, and if there is any corrosion found around the connections, clean them carefully to make good electric contacts. Next examine the insulation, which may have been chafed off at some corner; wrap any such points with friction tape, so that the wires cannot come into contact. If broken wires are met with, cut out the broken piece and splice in a new one, soldering and taping POPULAR MECHANICS the joints. Often these simple steps wil] suffice to restore an installation that wil! not ring at all or that rings intermittent|, or weakly. If they do not, unscrew the push button and see that the terminal hold the wires firmly, that the screws hold ing the contact springs are tight; that the springs come together and fly apart when the button is pushed and released, and tha; all contacts are free from corrosio: Remedy any defects by tightening ser bending or replacing the springs ani cleaning the contacts. Weak or loose « tact springs may cause a bell to ring suddenly even though no one touches | button. Often it will be necessary to pro vide a new push switch to remedy trouble here. As a rule the mechanical parts the bell ringer give little trouble. The bel! hammer may have been bent some so that it does not hit the bell, or bears - tightly against the bell that the armatur: cannot vibrate, but these troubles easily remedied by loosening the scr and bending the hammer shank. Anot reason why the bell will not ring may found at the point where the sprin makes contact with the end of the scr G. The repeated and rapid making breaking of contact here causes tiny e|: tric sparks to fly back and forth bety the screw and the spring, so that the of the screw is burnt off. Remedy thi scraping off any burnt part and readjust ing the screw until the armature a; vibrates freely. In cities and towns where lighting « rent is supplied, a small bell-ringing tr former may be used instead of dry c The method of installing such a tra former is shown in Fig. 3. Two oi terminals are connected to the 110 line and the other two terminals to the circuit. The proper connections ar« indicated on the transformer, so that mistake can be made if the wiring is ¢ carefully. The two terminals to which bell circuit connects usually supply 6 \ pressure. On some types of transfor: there are three terminals on the bell cuit side so that any voltage of 6, 8 o1 volts can be obtained. The two outer minals give 14 volts, the center ard end terminal give 6 volts, and the ce and the other end terminal 8 volts. 1! voltages are marked between the termin Fig. 3 shows how a doorbell and a bu on the front and back door of the h are wired, each being controlled wit push-button switch, and run by city rent through a transformer. When a or water pipe runs close to the bell also close to the push button, it can \«

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1013 POPULAR MECHANICS 1015 will Po auzzer used instead of one wire; this method of installa- seu wil ~~" tion is especially handy where the switch and bell | are quite a distance apart as it saves about fifty per | (“| cent of the wire. Where the wire is attached to | J || the pipe, a clamp should be used to obtain a good a f electrical connection or the wire may be soldered to the pipe. In some instances it may be desired to have a bell controlled by several push buttons located at i\! | different points. If they are not too far apart the 1 |; method of wiring shown in Fig. 5 will be the best. t| Where two bells or buzzers, or a bell and a buzzer + | . & = | must operate simultaneously on one push button, a the arrangement shown in Fig. 6 should be fol- Foose t | lowed. It may be desired to have two bells at remote points and one push button near each bell, } == a SA = SS ‘ Fic.2 FRONT DOOR ; y * ; ‘ ‘ ‘ $ . AY me : 4 % 7 .=s T + “+ 3 7 ¥ TRANSFORMER he.3 --110-VOLT LINE BASEMENT ‘ ; “é " : t - Vv — PARALLEL- PARALLEL-CONNECTED CONNECTED PUSH BUTTONS ; BELLS Fie.5 Fic.6 Figs. 2 and 3, an Actual Installation of a Bell and Buzzer Supplied with Current through a Small Transformer; Below, Connections for Various Bell Installations in Home and Office perating both bells at the same time. water pipe if one runs along the points his arrangement, shown in Fig. 7, is indicated. In these diagrams a single dry indy between the house and barn on the — cell is indicated to denote the source of iarm, for example. The lower conductor, current, but at least two dry cells should to which four taps are made, may be a_ be used, or a transformer. An Emergency Spring Repair culty, although the bumps and jolts, taken by the frame directly, were unpleasant.— While driving over a rough mountain Hal. S. Borland, Asheville, N. C. detour, I broke one of the front springs on my automobile. As I was about twenty niles from the nearest service shop, with hve miles of rough road ahead, and as the break was a bad one, all but the bottom eat being broken, an emergency repair of ome kind was necessary. I jacked up he frame of the car and then inserted a piece of planking (which I found near by) etween the frame and the broken spring, parallel to the front axle and directly hove it as indicated. Of course, I wired the piece in place so that it could not work ose. WH i dened ; . : ' ii : Vith thi vow pcs drove on to the Block Inserted under Frame Is Good Emergency Re epair shop without any trouble or diffi- pair for Broken Spring FRAME BROKEN SPRING

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1016 Old Phonograph Used to Turn Color Wheel In a small western dance hall where it use a was desired to color wheel but a small electric motor was considered too expensive, an old phono- graph of the cvlindrical- record type was found useful. It was placed on the ioor, as shown in the photo, and a length of rope serving as a belt was run from the phonograph cylinder to the color wheel. To give a pre- sentable ap- pearance the spotlight and color wheel were mounted on an old wicker lampstand.—Charles W. Geiger, San Francisco, Calif. How to Read the Future Whether or not the householder “be- lieves in signs,” he would do well to pay heed to the following maxims, which are the result of long experience and study on the part of Mr. John J. Gilday, chief of the fire department of Hoboken, N. J.: A crack in your chimney is a sure sign that vou are going to move. To see a paperhanger hang paper over a flue hole indicates an impending loss. It is worse luck to look in a dark closet with a lighted match than to see the new moon over your left shoulder. When the wind moans it is extremely bad luck to burn trash near your house. If you smell gas or gasoline and look for it with a lighted match, it is probable that you are about to start on a long journey. If you have a pile of rubbish in your cel- lar, it indicates that a crowd of people are coming to your house. A quart of gasoline will cause an auto- mobile to move three miles. A _ similar amount in household cleaning may cause three auto fire trucks and an ambulance to run a similar distance. A child who plays with matches will gain experience—if he lives. POPULAR MECHANICS Wood for Cupboardgg-Cabinets and Refrigerators” > One essential of woods used in making compartments for storing foods is the sence of strong odors. Cedars are recommended for this purpose, althoug if they must be used, they can be pai: to kill the odor somewhat. Other wo: such as hemlock, pine, cypress and cott wood, while they also have distinct od will not impair the quality of the food un less the latter is placed in direct cont with them. The wood used in building frigerators is subject to extremely trying conditions. Light woods conform to tly requirements better than the heavier ; denser woods, but do not permit th beauty of finish possible with oak, ash birch. Elm is a suitable wood and is fact, used largely in refrigerators becaus it stands the moisture well, and is not fected by repeated scrubbing. Rustic Bird Houses Novel rustic bird houses of odd desis can be made from a saw log of straig grained wood, preferably black oak walnut. The only tools ne ~ ed are a saw, ax and hamme: A log, not less than 8 or 9 in diameter and 12 or 13 long, is obtained, and five six 2-in. holes are bored int it; these holes should be line lengthwise, spaced ab: 10 in. apart, and about 3 - deep. The log is then cut into 10-in. lengths, as show: Fig. 2. Next, these sect are split as shown in Figs. and 5, and the parts are sembled and _ tied toget tightly with rope, as show: Fic.5 Novel Rustic Bird Houses Made from Log

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POPULAR MECHANICS 1017 6. A number of 10 by 10-in. pieces \-in. board are nailed to the ends of e units, each thus forming an individual e, Fig. 7, and the rope is removed. remaining part of the log can be set in sround and the houses mounted on it, above the other, as shown to the left. ebirds, woodpeckers, house martins wrens are especially fond of these ises. If desired, a few crosspieces can nailed to the log to form a trellis for a e, which adds to the natural beauty of arrangement.—Willis Mehanna, Bus- lowa. Tennis-Court Marker lennis-court lines laid with dry lime neither lasting nor otherwise quite tisfactory. For this reason I made the PATTERN FOR DISTRIBUTOR at the upper end and is held alongside the handle of the truck by means of a screweye and a small bracket. A coil spring is held on the rod between the bracket and a cotter key and washer, so that when the rod is released the gas cock will be turned shut. In use, a thin solu- tion of slaked lime and water is mixed thoroughly and poured through the strainer into the tank. The right propor- tion of lime and water can best be deter- mined by experiment; it has been found that a thin mixture is better than a thick one, as it soaks into the ground more easily. Before marking, the earth must be smoothed and rolled, then sprinkled. o> GALVANIZED TANK, 10X12 X24" _- SCREENED STRAINER Constructional Details and Method of Using a Three-Wheeled Tennis-Court Liner Which Makes Durable Marks and Can Readily Be Made and Operated by Anyone et liner shown in the drawing, a simple ichine that will make a durable smooth- lged line when thoroughly dry. The ink is made of galvanized sheet iron: is about 24 in. long, 10 in. wide and 12 . high, and is supported on a low three- heeled wooden truck. The wheels are bout 8 in. in diameter and 2 in. thick. \ handle is fitted on the truck and is sup- ported by a flat-metal bracket. In the top i the tank is a strainer and lid which ooks on the edge of the tank. A gas ick is soldered in the bottom, flush on ie inside, and a two-piece sheet-metal ‘rough or distributor is nailed to the bot- tom of the truck directly under the cock. he lower details show how the distrib- itor is cut and bent. The cock is opened nd closed by means of two metal rods ivoted end to end, the shorter one being bent around the handle of the cock. The onger rod is bent to form a finger grip Never try to mark dry earth, as the solu- tion will roll instead of adhering to the earth. After a few trials anyone will be able to make a smooth line.—Lerov Cony, Placentia, Calif. Preventing Solid-Tire Wheels from Slipping The cook at the navy-yard hospital at Charleston, S. C., has perforated solid tires on his truck. One day he got stuck in the mud and had a hard job getting out. so I sawed up a couple of old broomsticks into 8-in. lengths. These are stuck through the holes in the tires when the roads are muddy, or muddy spots are likely to be encountered, and he hasn't had any trouble since, as these sticks are very ef- fective in preventing the wheels from slip- ping in the mud.—Harry W. Yeager, Charleston, S. C.

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1018 POPULAR MECHANICS =~ £2. ; . 3x15 x93 Guing rt ( CLEATS ‘ s 7 7 ! “ y; 4 ‘ z ee y PA “ | ' : a ‘ ~N w , a7? ete ALD 3 aie | Sig ja_t \ ‘ ; ie Ve + = ~ | r 1 i ” 3} oo, = It ‘le | RF © ll ~ La 8s s",,! ae CLEATS 4 X15 RAIL S--Hty Ait + 1 AL a | j | W ¢ = } (a = DETAIL OF TOP DRAWER CASE ily ) Y i DETAIL OF FRAME Fia.!

Above, Left, Method of Constructing the > AN ad Bathroom-Cabinet Frame; Right, Construc- SS > > i tion of Top-Drawer Cases: Below, Perspec- a> tive View of Finished Cabinet in Use 2. otto ——-

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_ BUILT-IN FURNITURE Li _——y FOR THE Part VII—A Bathroom Cabinet T= modern bathroom is incomplete vithout a linen cabinet of some kind. e dressing table illustrated is not only y useful as a storage place for towels, ving supplies, and other bathroom essories, but is unusually well propor- ned and neat in appearance. Preferably s built in combination with the medi- ne chest, the mirror door of which is the rect height for the use of a person eated at the cabinet, while not too low convenient use for the man who pre- to shave standing up. However, if bathroom is already equipped with a cine case, the dressing table may be t without it. cabinet is 7 in. high he main top, 6 in. long 1 1% ft. in pth. The lges of the ird_ parti- ons form awer and nging stiles, us making e construc- ion very mple. Lay out the back nd end walls the levels for 8-PENNY FINISHING NAILS, nr END NOSING MITERED_ / INTO TOP A 34 by 1'4-in. stile is then nailed to the wall, bearing against the cleats it is likely to come between studs, ; and since it must depend temporarily on the cleats for its support. wall is out. are spaced 1 ft. above the floor, 1% in. and are 1 It is wedged to plumbness if the The tops of the drawer cleats and 1 ft. 10% in. ft. 314 in. long, the right-hand ends coinciding with a line plumbed 34 in. bevond the end of the top cleat. On the floor, square lines from the vall locating the bottom of each partition, and lining to the insides, by 2-in. stock to the floor. nail cleats of 1 The one for the right end of the cabinet must extend 1 BOTTOM SHELF HAS %MARGIN -. ABOVE RAIL ‘ DETAIL OF BOTTOM METHOD OF H & cleats, petaior top Nosinc ROUNDING ‘ wa’ “y — hich are all of NOSING 16. . e Fic.2 | by 2-in. stock, xcept for those near the floor. leat at the back is 4 ft..5% in. long, and mate on ws end wall, which butts gainst it, is 1 ft. 334 in. A like cleat, 4% longer, is nailed 1254 in. below it, and esting on the floor a third, 314 in. wide. he front ends must be plumb on the wall. The top ft. 5 in. beyond the plaster, and the other two must just meet a line drawn on the floor from the end of the first cleat to a point 1 in. be hind the front edge of the hanging stile on the end wall Glue up the partitions from 1 by 10-in. stock, cutting them = roughly to 2 ft. 6 in. in length, and driving three corrugated fas teners across the joints on the back. Lay aside to dry, and glue up the top, using al by 10-in. and a 1 by 12-in. board, cut to 4ft.9in. in length. Also glue up 10-in stock for shelves. If the medicine cabinet it is now time to cut the is to be built opening in the 1019

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1020 plaster. Plumb a line from the center of the dressing table layout on the back wall, and locate a point 3 ft. 134 in. above the floor. With this as a base, center a rec- tangle, 2414 in. wide by 3 ft. high, on the line, making it plumb and level. Remove the plaster within and saw out the laths. Cut off the studding thus exposed. This is difficult and tedious, but can be done by careful work without cracking the plaster on the other side of the partition. Square lines on the studding, and saw in as far as possible. Split out as much as possible of the piece to be removed, and then finish cutting off by alternately cutting to the line with a chisel and splitting out the waste. Cut off the lath nails and cut in the head trimmers, as shown in Fig. 1. If one stud is not placed to act as a side trimmer, two studs may have to be removed, in which case neither end of the head trimmer can be nailed; but it must be spiked to the short studding and below. Nail in side trimmers required, keeping them 1 ft. 11 in. and plumb. Nail the loose ends lath to these. Stand the left partition against the wall in the floor position, and scribe to the floor and wall. After ripping, fit carefully to the wall and tack in place. Then plumb up from a point | in. in front of the line on the floor, level the top line from the upper edge of the top cleat, and level the top line tor the shelf cleat from the cleat already in position on the end wall. Re- move the partition, and cut to size. If the builder is very skillful he can speed up this operation by setting his scribers to the exact distance necessary to reduce the par- above where apart, of the POPULAR MECHANICS tition to width when scribed to the wall, but in this case the front edge must first be carefully plumbed. Nail on the shelf cleat, keeping the front end 1 in. behind the front edge of the partition, but do not glue, as in that case shrinkage will chec! the wide board. If necessary, clamp the cleat to the board while nailing to take out any warp. Drive the nails at variou angles to get a dovetailing effect. The other partitions are fitted in like manne: Nail the partitions in place and brace the front edges by tacking a strip across them all. Test the tops for alinement an cut in the rails. Notice that the uppe door rail is 1 in. wide, while the two othe top rails are 1% in., making the top of the door line with the top lips of the drawer Nail into the ends of the rails through the partitions with six-penny finish nails. The drawer rails must be level. The cente cleat above the top drawer is 1% in. wide and prevents the upper drawer from sag ging when opened. Fit the shelves, notch ing them around the upright stile on the wall, but keeping them back from the front 1 in. for the thickness of the door. If de sired, they may be placed before putting up the partition. The lower rail for the shallow cente! drawer is ¥% in. thick by 3% in., width horizontal; and slide cleats nailed to the partitions are notched underneath to strengthen the joint. The elliptical brackets are laid out as shown in the diagram, Fig. Using a string, or better, a fine wire looped at bot! ends with a total length of 1 ft. 6% in., the length of the long diameter AB, strik« arcs through this diameter with one-hal! sanded. : p piece, 1 by 2 in. by 6 ft., pine or fir, piece, 1 by 3 in. by 4 ft., pine or fir, S4S, sanded. S4S, sanded. 2 pieces, 1 by 10 in. by 16 ft., pine or fir, S4S, sanded. 1 piece, 1 by 12 in. by 19 ft., pine or fir, S45, sanded. 1 piece, % by % in. by 8 ft., base shoe 1 piece, l-in. quarter round, 8 ft 1 piece, “%-in. quarter round, 6 ft. 1 piece, 1 by 4 in. by 2 ft., drawer front 1 piece, 1 by 6 in. by 2 ft., drawer front 1 piece, 1 by 7 in. by 2 ft., drawer front 1 piece, 1 by 8 in. by 2 ft., drawer front 1 piece, 1 by 9 in. by 2 ft., drawer front. 1 piece, % by 9 in. by 14 ft., drawer side 1 piece, “a by 6 in. by 6 ® drawer side 1 piece, 54 by 4 in. by 4 ft., drawer side 1 piece, 1 by 2 ft., M%-in. three-ply panel veneer Dressing 1 piece, 1% by 4 in. by 3 ft., pine or fir, S45, sanded 1 piece, 1% by 3 in. by 6 ft., pine or fir, S4S, sanded. 1 piece, 1 by 2 in. by 10 ft., pine or fir, S4S, sanded. 2 pieces, 1 by 2 in. by 12 ft., pine or fir, S4S, MATERIAL LIST Table 1 pair 2% by 2%-in. hinges. 1 piece, 4% by 6 in. by 14 ft., T bottom. 1 piece, 4 by 6 in. by bottom. 7 1%-in. glass drawer pulls (knobs). 1 frog catch. Cost of materials, about $9.50. Time to build, about 20 hours. & G pine, drawer 16 ft.. T & G pine, drawer Medicine Case 1 piece, 1% by 3 in. by 8 ft., pine or fir, S45 sanded 1 piece, 1% by 4 in. by 2 ft., pine or fir, S45 sanded. 1 piece, 1 by 6 in. by 10 ft., pine or fir, S45, sanded. drawer bottom 3 by 3 ft., three-ply pine panel 1 piece, %& by 6 in. by 8 ft., pine 1 piece, 4% in. by veneer. : 1 pair 2% by 2%-in. loose-pin butts 1 1%-in. glass drawer pull 1 frog catch. 1 plate glass mirror, 1 ft Cost of materials, about Time to build, about 7 27% in. by $6.09 hours

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POPULAR MECHANICS 1021 7 \\ | ff ] BEVEL-EDGE PLATE- | GLASS MIRROR, a Lae 14% X 24%, IN DOOR OF MEDICINE CASE : | | 2 | . ~ Q 2 G 3-44 ite | " sh ee ; - Front and End Elevations of the Com- 2” ---s.H ») f4- 3 pleted Bathroom Cabinet, with Details KW hes is 25 3 of the Medicine-Cabinet Trim e string as a radius and the upper point upper slides are kept flush with the lower the curve as a center. Drive brads at edge of the upper rail. Make the tops %& ese intersections, loop the ends of the in. thick with a l-in. projection in front ng over them and trace around with a and at the ends, and miter around undet neil, which will give a sufficiently true neath a '4-in. quarter round. pse. Cut out with a compass saw or by The drawers are made \% in. narrower erfing with a handsaw to the line and than the openings and ¢ in. shallower for iseling out the waste, finishing with clearance, and have \%-in. lips, 3g in. wide, okeshave, rasp and sandpaper. When on tops and ends of fronts, which close icing them set back % in. from the face over the rails and stiles. Since the amount ges of the partitions and the rail. of material for the sides is so small, the Scribe the top to the end wall and then material for the deep drawers is ordered the back, and when fitted in position, 9 in. wide and ripped down to the required rk the projection of end and front from width. Rabbet the sides into the fronts e cabinet itself. Remove and miter into and the backs into the sides, assembling e end of a strip, 1% in. wide,as shown in the drawers and then sliding the bottoms e detail Fig. 2. Finally, round off the in. Square carefully and tack brads ve and nail into place. through the bottoms into the sides to pre he little drawer boxes on top are built vent racking. The side partitions and much the same way as the main cabinet. cleats serve as guides, so no strips on the at is, the sides must be scribed to the bottoms of the drawers are required. ble top and the walls, and bottom cleats Build the door of 1% by 3-in. stock, ust be supplied to act as drawer slides sized to 1 by 2% in. for the stiles and upper nd to prevent warping of the sides. The _ rail, with the lower rail 3 in. wide, net. Cut

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LO2Z2 vop--=*}-B°3-PLY PANEL VENEER y fete Secs te eSarr 4 - 4 us -DADO 3 DEEP © e DETAIL OF the panel 11% in. by 1 ft. 944 in. Surface down until the door has a clearance of Ye in. on the shelves when hung. The hinges are lined with the inside edges of the rails and project % in. The medicine case is simply built of 1 by 6-in. stock, which, when jointed up, is 54% in. wide. The top and bottom, 1 ft. 834 in. long, fit in rabbets 34 in. deep in the ends of the sides, the latter being 2 ft. 7% in. in length. The three long shelves, made of drawer-bottom material, are housed in dadoes, 3% in. deep, and are there- fore the same length as top and bottom. The short partition butts against the shelt above, but dadoes into the bottom, while the short shelf butts against it and dadoes into the side. Assemble the frame, nailing the corners in both directions, tack a brace across the front, and size the back edges to alinement, afterward nailing on a back of 3¢-in. three-ply panel veneer. Set the box plumb and centered in the open- ing in the wall with an equal projection all around, and wedge tight for nailing into Proper Care of Rubber Goods There are two agencies that hasten ma- terially the deterioration of rubber arti- cles—heat and sunlight. At 160° F., articles that would otherwise last five or ten years are destroyed in a few weeks, and at higher temperatures the action is even more rapid. This explains the rapid deterioration of waterproof coats, hot- water bags, etc., which are thrown over steam radiators or hung over hot-air reg- MEDICINE CASE POPULAR MECHANICS PANEL,IS$X25§ ----------- , BEAD, Tk A" MIRROR, I4g X24, \ = fa Ae, p—2ey - 2 DETAIL OF . > MIRROR-DOOR CONSTRUCTION ka - Fig.6 LAYOUT OF ELLIPTICAL BRACKET Fic.7 the studding with eight-penny finish na Make a plain mold similar to the detail a: miter it around the case, fitting the thic! edge against it. Round off the cas corners. The mirror door is of the sam: construction as the dressing-table d: except that the panel groove is cut ‘16 from the back edge, so that there wil room in front of the plate glass mir to tack the retaining bead of 4 by ™« pine. Before setting the mirror, paint | back edge of the mold, as this is reflect: in the glass. As with all other cabinets, sand thi oughly before finishing, remembering t! the slightest scratch or hammer m shows plainly when varnished or enamel: isters to dry. In direct sunlight, rub! bands that would ordinarily last from t: to six years become useless in th months. The ideal storage place for r ber goods, therefore, is a cool, dark pla Oil has also a serious effect on rubber It is absorbed by the rubber, and in short time produces a soft spot. It therefore, of the utmost importance to move any oil from rubber goods as s« as possible, and it pays to see that the t do not come in contact at all.

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POPULAR MECHANICS 1023 Wood for Shingles he wood used for shingles must be durable because they are usually ex- ed to the weather without paint cover- or other preservative treatment. Ce- cypress and redwood shingles give ellent results, although pine shingles e been known to last for many years. esh redwood shingles discolor the rain ter that passes over them, and the ce- rs give it a disagreeable taste, but, after ew rains, the leaching ceases, and the ngles no longer impart any objection- e qualities to the soft water for the tern. Electric Fan Distributes Heat During spring and autumn when the irnace is not used constantly, the morn- gs and evenings are apt to be rather iol, and it is then uncomfortable to sit the living room without additional eat. When the kitchen stove is on and e kitchen is kept warm, it is an easy atter to bring the heat into the living om by the arrangement shown in the rawing. All that is needed is an electric n, a vacuum-cleaner hose, about 10 ft. ng and a large tin funnel. The latter is ttached to the rear end of the fan and ne end of the hose attached to the funnel, iter the spout has been removed. The ose is brought through the wall and istened to the wall of the kitchen near e ceiling. The fan is then started and will draw the warm air from the kitchen, hich will soon remove the chill in the Electric Fan and Vacuum-Cleaner Hose Leading to Kitchen Remove Chill from Cold Room ljacent room. To avoid a direct draft, screen may be placed in front of the in.—G. G. Grose, McComb, Ohio Blueprinting on Letterheads Nearly every amateur photographer, after he has progressed beyond the stage of havitig a professional finisher make his Blueprinting on Letterheads Can Be Done at Home by Simple Process prints, desires some method of expressing his own individuality, but is deterred from attempting gum prints and other advanced artistic forms by the complicated processes involved. However, very pleasing prints on letterheads, wood and even on cloth can be made by the following method Obtain a yard of ordinary slow-printing blueprint paper and then, working by the light of an oil or electric lamp with the paper shielded from direct rays, swab a portion of the surface with a tuft of ab- sorbent cotton moistened with water. When sufficient solution has been taken up to transfer to the letterhead or other object upon which the photograph is to be printed, carefully swab that surface with the saturated cotton till the solution is drawn into it, working in such a manner that no streaks will be visible. After this is done, piace the sensitized paper, wood or cloth in a dark closet to dry, and the next day print in direct sunlight until the shadows are well bronzed. Then wash in plain water and a pleasing print in deep blue will result. If the blue color is ob- jectionable, it can easily be changed to a brown tint. This is done by first bleach- ing the image in a solution of household ammonia and then redeveloping it in a weak solution of tannic acid—John D. Mayer, New York City.

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1024 POPULAR MECHANICS pictitin g, Flip ard ot or "T BERE are several hundred thousand users of outboard motors, all of whom are interested in getting the most for the smallest investment, as well getting maximum service out of their motorized rowboats. The writer has done a great deal of boating with outboard-motor boats, including some lengthy cruises in quiet in- land waters as well as at sea. In doing this, he has learned a great deal concern- ing the limitations of such low-powered water craft, well about the wide range of use such boats may have by the adaptation of certain homemade me- chanical features to overcome limitations. The average outboard motor has a fuel capacity of about a gallon—sufficient only for about two hours of operation with the motor at full throttle. Obviously, that fuel capacity is not satisfactory for lengthy as as as cruises. Frequent refueling is undesirable largely because all outboard motors are two-cycle engines, which necessitates care- ful mixing of the lubricating oil with the gasoline. Of course, a quantity of ready- mixed fuel may be carried in the boat, but the transferring of this from container to motor tank is always a nuisance. come this objection, I fitted my boat with a regulation Ford-car oval tank, having a capacity of approximately 10 gal. _ This tank is placed under one of the seats in the boat. The gasoline line to the motor is a copper tube, with a final 12-in. length of flexible metal tubing for connecting with the motor. The flexible tube reduces the risk of a broken gas line and leakage that might result from motor vibration. Gasoline mixed with lubricating oil won't To over- flow uphill, so a leather under the filler cap of the 10-gal. make an air-tight joint. gasket is fitte tank An ordinary aut mobile tire-valve stem is soldered into the top of the tank, and a little air pressui furnished with a few strakes of an aut tire pump moves the gasoline to the moto A shut-off valve board motor. except when refueling the motor. Whe refueling is desired, all that’s necessary to open the valve. the fuel into the tank of the The air pressure feed outboard is placed in the line where the flexible tube joins the tank of the out This valve is kept closed motor, and when the fuel begins to squirt out of the air vent, the motor tank full. The valve in the line is then close and there’s no more fueling trouble t another two hours, and then only to be opened. The 10-gal. tank provid fuel capacity for twenty hours of cruisi: at full speed (six to eight knots), or for distance of approximately 125 mile There’s no fuss, no muss, and no bothe about this fuel system, and there is a su stantial reduction in the fire hazard compared with the old method of handli: gasoline in open measures, slopping about the boat, etc. If the outboa motor is to be removed, all that is nece sary is to release the air pressure in t! main gasoline tank, and disconnect t! flexible line from the motor, about a tw: minute job. Many hours of cruising served to de onstrate that the noise, vibration an work of driving the boat from the re seat, with one hand on the outboat motor tiller handle continuously, const a valv

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POPULAR MECHANICS . severe nervous strain. Also, the rear eat is by no means the most advantageous ( \iter having tion from which to manage a boat be- wise the steersman cannot see where he is r nor can he look out for floating sea- eed, sedge grass, or fixed or floating ob- tions that may be the cause of trouble. ogical place for the pilot when hand- iny kind of a boat is in the bow. More- the average small boat makes better when the bow is loaded down than it is high. A small yacht steering | was therefore obtained and mounted . thwart between the forward gunwales, hown in one of the accompanying tographs. Lengths of white line run m this steering wheel through gunwale evs, and are lashed to the outboard- tor tiller handle. Two lengths of copper - and a push button provide a cut-out -h can be operated at any time from pilot seat to stop the motor. With arrangement, the boat is steered from omfortable upholstered seat well for- rd, away from the noise and vibration the motor. The pilot sees where he is ng, the bow is kept down as it should ind there’s no strained or unnatural ition to be ‘upied for urs at a time. complished ese improve- ents and find- them thor- ughly satis ctory, there is still one ore. altera- in of vital im- irtance to be de. That was »me method ir protecting e motor from isture and ‘ray when vigating in ugh waters. he outboard otor will go ut of business tantly if a sod dousing spray de- ends upon it. Vhen it gets et, its ignition stem is irted, and en this hap- ns the motor View of the ’ Showing the Gasoline Tank and Pipe Line and the Steering Wheel General Boat with the 1025 is done. It rains in most parts of the earth where these motors are used, and even the most placid lake of any considerable area can kick up enough of a sea in the right kind of a wind to stop the average out- board motor when a douse of spray comes over the bow. The writer went to work with a few carpenter's tools, some white lead, and paint; did a little careful work and com- pleted the water-tight motor cover shown in some of the illustrations. The thing is ridiculously simple, being nothing but a water-tight box with a hinged lid, built to fit over the motor and into the stern of the boat. When put over the motor it holds itself in place by being carefully fitted into the gunwales and stern of the boat. It is additionally secured, however, by means of four copper screen-door hooks. This cover can be applied or re moved without disturbing the motor. Likewise, the application or removal of it can be done either on shore, or from the cockpit of the boat when in open water. By having the top of the box hinged, the lid can be raised to make the motor accessible for starting or for adjust- ments. Tiny scuppers are cut into the wood where the lid parts join the main body of the box to carry off any water that might other- Wise get to the motor through the joints. Some difficulty was experi enced in keep- ing water from splashing up under the stern of the boat and getting into the motor when running before a following sea. This trouble, however, was overcome by providing a canvas “petti coat.” This is a piece of can vas fastened to the rear of the motor cover Motor . with copper Housing Removed,

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1026 POPULAR MECHANICS Above, the Motor Housing Is Opened to Start the Engine; the Housing Is Removed Merely by Releas a Few Hooks; Left, Cruising with the Housing Closed, and Right, View over the Stern, Showing Canvas “Petticoat”

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Lay rim of the ylass, which necessary to break the vylass before the rim can be removed. trouble is POPULAR MECHANICS 1027 s. The lower end of it has a tunnel 1 carrying a length of white line which ecured around the motor driveshaft me. The whole assembly gives absolute tection to the motor, and keeps it dry | functioning, regardless of rains or ubled waters. \lthough this boat is only 16 ft. long, | was intended for use only in quiet, tected waters, it is, with these improve- ents, a genuine little sea-going outfit. has been up and down the coast for eral hundred miles north and south of \ngeles, and well out to sea on fishing s when the Pacific has been just as ugh as it ever gets. It has weathered rms that have caused other and bigger sats to seek friendly harbors. Its most ent accomplishment was a 200-mile lise among the islands of the Santa rbara group in the open Pacific off the vast of Southern California. On this wccasion, the boat, carrying its owner, his mpanion, and 800 pounds of equipment, a total load of more than half a ton, ossed stretches of open sea the longest which was nearly 50 miles. Further- iore, during this cruise the boat had to be tvigated by regulation deep-sea methods, being frequently 20 to 25 miles from the nearest land, and out of sight of land for i total period of approximately 20 hours— ll this without a single motor failure nor ny incident that could be termed as par- ticularly thrilling, aside from a world of holesome pleasure and enjoyment. Preventing Auto Headlights from Rusting Headlight glasses occasionally have to be removed and one often finds that this a rather difficult task, due to the rust retween the imp and the HEADLIGHT-. FRONT GLASS AND RIM ‘y iy make it ] lhe same APPLIED HERE ometimes ex- erienced when the conductor plugs are etached from the headlights. To pre- ent this a little cup grease should be ap- ied between these parts at the points in- icated in the illustration. ‘Although this expedient saves a lot of time and trouble lost car owners neglect this entirely. Springs on Bicycle Fork Make Riding Easier Shock-absorbing springs attached to the front fork of a bicycle, as shown in the Extra Fork and Sorings on Bicycle Reduce Vibration of Handlebar and Make Riding More Comfortable drawing, will make riding over rough roads much more comfortable. On bi cycles equipped with a small motor such an attachment is of special value. It con sists of a length of 4%-in. flat iron, about 1 in. wide, bent to a U-shape to fit over the front wheel as shown, and two screen door springs. Holes are drilled at the ends to fit the hub axle and to take the bearing bolts, which hold it to the ends of the fork. Obviously, the nuts on these bolts must not be drawn up tightly but must be just loose enough to permit the piece to pivot freely on the forks, the nuts being pinned in place with cotter pins. It is still better to provide a sleeve around each bolt and then draw the nut up tight. Or- dinary screen-door springs are attached to the handlebar with heavy wire hooks and also to the extra fork, holes being drilled to permit this. The distance from the hub-axle holes to the bolt holes should not be more than 2 in. to avoid undue strain on the springs.

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1028 POPULAR MECHANICS Driving Coaster by Hand A simple attachment on a coaster, as shown in the drawing and photo, can easily be made by any boy from material How to Apply Adhesives In general, the surfaces to which hesives are to be applied should be and free from grease or other impuriti: If the material is \x Simple Attachment on Coaster Wagon Permits Driving It by Hand at Con- siderable Speed that can readily be obtained anywhere. A heavy flat-iron clamp made in two parts to fit over adjacent spokes on the right rear wheel is screwed together and a hole is drilled through it to receive the end of a connecting rod, which is made of ¥4-in. round iron and bent at the end to run free of the wheel hub. A washer and pin are provided on each side of the clamp to hold the connecting rod in place, and a wooden handle, such as a length of broom- stick, is pivoted to the side of the cart and to the other end of the connecting rod as shown. The upper part of the handle should be of sufficient length to permit the driver to slide his hand up or down until he finds a point where the propelling action is smoothest.—Loy E. Owen, Col- lege View, Nebr. Substitute for Phonograph Diaphragm The diaphragm of my phonograph re- producer was broken accidentally at a time when I expected to entertain visitors. In the emergency, I obtained an old pho- tographic cut film and made a substitute which proved entirely successful. I traced around the broken diaphragm, cut out one of similar size from the film and drilled a hole in the center. The disk, thus made, was placed on the reproducer and the sty- lus bar connected to the diaphragm with a small screw.—Henry B. O’Connell, New Haven, Conn. porous, it may be nec: sary first to fill the por by applying one or mor preliminary coats of adhesive, allowing ea coat to sink in. The fi: coat must be put on ve: thinly and the surfa to be joined pressed to the very closest p sible contact. T! applies especially wood, china, etce., a: joints made in this ma ner will be stronger t! if a thick layer of the ; hesive were applied. Many adhesives can | kept for a long time wit out impairment of the strength, if they do 1 decay or become moldy; others should | used as soon as possible after they prepared. Some, which must be warm: before applying, often dry out or beco: stiff and should be mixed with water give them the proper consistency. Cleaning Stovepipes Pounding stovepipes to remove t soot accumulated in them during the wi: ter is ineffective and injurious. A bett: way is to use the easily made clean: shown in the illustration. It consists o length of sprii wire formed to double con shaped spira about 6 in. in « ameter at its w! est point, and tached to a a carded broot stick as indicat: By inserting cleaner int end of the pi and moving back and _ fort F the inside of t pipe is scray clean in a te seconds. It is the soot particles sticki! to the inner surface that absorb moistu and cause rusting during the summer, 4 pounding will not loosen them. ‘SPIRAL SPRING a Se LOWE BRUS CRO ACT —————————— VIE VIB ARI

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Auto-Horn Troubles and Remedies By G. A. , electric auto horn is a needed acces- sory and must be kept in good condi- Still, because of constant use, it is to get out of order frequently. The ble is usually easy to find and can y be remedied by any driver or A Cte ery electric horn has a thin dia- igm, which is vibrated by mechanical ns so that a sound is given off, the of which depends on the rapidity of ition of the diaphragm. Two meth- are used to cause these vibrations, h divide electric horns into two es, namely, motor-actuated horns and rnet-actuated horns. The cross-sec- il view of these two types is shown in l and 3. The motor-actuated horn the more expensive and is found on h-grade cars. It consists of a small tor on the shaft of which a toothed Pp seesh 777, FIELD, ARMATURE | POLES ’ a7 { i 4 — 1A | B ~ | ; e \ |Z LOWER __-* FIELD BRUSH WINDING CROSS SECTION OF MOTOR- ACTUATED HORN LUERS wheel is attached so that the teeth strike against the end of a small button or pin on the diaphragm, as shown in Fig. 2. When the push button on the steering column is pressed, the motor is given a whirl, and the rapid succession of taps against the button causes the diaphragm to vibrate. The usual trouble experienced with such a horn is decreased intensity of sound. This is caused by slight wear of the button or teeth, and can be compen sated for by moving the motor shaft to- ward the diaphragm just a trifle, so that the teeth will make closer contact with the button. This adjustment is made by loos ening the locknut A, Fig. 1, and screwing in the adjusting screw B, which moves the armature. Care should be taken not to adjust it too tight, or the horn will not work at all. The current that the horn consumes varies from 3 to 8 amp., depend- ing on the type of horn and its size. Ili more current flows than usual when sounding the horn, the bearings are per haps dirty and are in need of lubrication. The oil hole should always be kept clean and a little thin oil applied about once each month. The armature, or movable of the motor, should always turn part | Fis.! } HARD-TOOTHED -” WHEEL ii¢ > , | Ais aj ig j[ “BUTTON Fic.2 kK ie _ DETAIL OF a DIAPHRAGM . \.. GROUNDED DIAPHRAGM, ta J \ \ \ TO FRAME’ \ ’ . ® \ ; \ \ : \ ‘ \ \ : VIBRATING \ BATTERY SPRING CONTACT " Nanacgint il Fia.4 Fig. 1, Motor-Actuated Auto Horn; Fig. 2, Dia- vr phragm Vibrator in Motor-Actuated Horn; Fig. 3, VIBRATING —~ Magnetic-Actuated Horn; Fig 4, Actual Horn Cir- ARMATURE Fic.3 cuit in a One-Wire System

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1030 SIMPLIFIED HORN CIRCUIT. 2-WiRE SYSTEM Fie.5 POPULAR MECHANICS TESTING THE HORN CIRCUIT AMMETER Fig. 5, Simplified Horn Circuit of Two-Wire System; Fig. 6, Method of Adjusting the Diaphragm of a Ma; net-Actuated Horn; Fig. 7, Testing Horn Current easily when revolved by the fingers. The carbon brushes inside of the metor, which rub against the copper segments or com- mutator, should also be cleaned occa- sionally, as trouble will also be experi- enced when these are dirty. If the copper segments wear down faster than the mica insulating strips between them, the arma- ture should be taken to a machine shop and the commutator dressed down on a lathe and made smooth with a strip of emery cloth. The magnet-actuated or vibrating type of horn, shown in Fig. 3, is the more common type. It consists of a pair of small magnets, similar to those found in doorbells, and their action is also the same as the action of a common bell or buzzer, which is explained in an article on this subject on page 1013. In action, the arma- ture vibrates and strikes against one end of a rod, the other end of which is screwed to the center of the diaphragm. The most common trouble experienced with this type of horn is also decreased volume and can be remedied by inserting a long screw- driver into the horn from the front and giving the screw on the diaphragm part of a turn, as in Fig. 6. The two points, one on the end of the spring contact and the other on the armature, make and break the current when the horn operates, and the tiny sparks between them tend to burn the contact surfaces, causing them to stick onsumption in Absence of Dashboard Ammeter and rendering the horn inactive. 1 should be cleaned to allow good elect: conduction. After some time the p: which should be made of platinum ium, may be so badly burned that have to be replaced with new ones. Adj ment of the diaphragm should be n while the horn is operated until the sound and volume are obtained. Another trouble often experience: the horn circuit lies in the wiring t horn. Breaks and shorts are liable to cur, and the only remedy is to trac: wires leading from the horn to the meter, push button and battery. An act wiring installation of a horn circuit shown in Fig. 4. This is a one-wire tem. The current flows from the batt through the ammeter and the push ton, to the horn, returning to the batt through the frame, to which one sid the battery and the horn are secu grounded. If the wire is bare at any p and touches the metal on the car t will be a short circuit. This will not the horn, but will prevent it from f: tioning, and will discharge the batt in a short time. It often happens such shorts occur only when the car motion, the vibration causing a bare on the wire to touch some metal pat the car. In this instance, the sudde: crease in discharge shown on the meter indicates the trouble. Of cor

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POPULAR MECHANICS 1031 may also be in other wiring, outside the horn circuit. The remedy is to p friction tape over all bare places on wires. \ frequent source of trouble, which pre- nts the horn from operating but does t show on the ammeter, is a break in the re or a loose connection. A _ good ethod of finding the break is to take an linary doorbell, connect one binding st to the terminal of the car battery to hich the wiring is attached, and the other nding post to a 10-ft. length of lampcord th a needle at one end. Then, begin- ng near the horn, prick the needle rough the insulation of the wire to make ntact with the conductor inside. The will not ring on the horn side of the ik, but as soon as the break is crossed ili ring, which shows where the break Of course, during the test the push itton switch should be kept closed. If » break is found and the bell will not ng at all, it is safe to conclude that the uble lies in the push button. Push- utton troubles on doorbells are enumer ‘1 on page 1014, and except for differ ence in construction the same remedies e applicable to auto push buttons. Fig. 5 shows a horn circuit of the two- ire system. In this case, a separate wire used for the return circuit instead of he frame of the car. On some cars the rn current is not indicated on the dash ard ammeter. The current flowing rough the horn can then be determined Vv using a small pocket ammeter, connect | _ | in the horn circuit as shown in Fig. 7. Tag Holder for Animal Cages When guinea pigs, rats or other small ani- mals are kept in cages they have the habit of chewing the strings that hold the identifying tags. A little holder of gal- vanized iron, bent as shown in the illustra- tion, prevents the ani- mal from destroying the string or the tag, nd at the same time the latter can be readily removed and replaced. Catching Small Mackerel and Blue Fish with Umbrella Swivel A novel rig for use when fishing for small mackerel and blue fish which come into our bavs in large numbers every vear., An O:d Umbrella Frame Makes a Good Rig for Catch- ing Mackerel can be made from an old umbrella frame First remove the handle and fasten a small swivel to the thin steel rod in its place, then attach a No. 3 Carlisle or similar hook with a long shank to the end of each rib. After baiting the hooks with killies for small blue fish, or with a bait made up of oil sardines mixed with flour and cotton batting for mackerel, suspend the rig from the end of a stiff rod and lower into the water not deeper than 8 ft. Do not be in a hurry to draw in your line when the first fish bites, for the theor is that when the first fish is hooked, he will begin to swim around in a circle, pul! ing the outfit around with him and attract ing additional fish which will be more eager to catch the moving bait.—John D Mayer, New York City. Tools for the Home Handy Man } Have you ever started on a job around the house lh and had to stop two or three times during the work to uy or improvise tools before you could finish it? If you have—and who of us has not ?—you will be interested in the article on tools for the home in the forthcoming August issue of Popular Mechanics. The tools de scribed have been selected from the equipment of Popular Mechanics model workshop, and include all the home owner will need to do any ordinary job around the house, with valuable hints on their care and use.

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1032 Three-Sided Pan for Baking Cookies Ever on the alert for methods of de- creasing his labors, a baker found that a three-sided pan, which would cover the bottom of his oven, was a timesaver in baking cookies. The pan was made of medium-weight sheet iron. When the cookies are done, they are transferred to the pastry ONE SIDE LEFT OPEN Three-Sided Pan Aids Baker in Transferring Cookies from Oven to Pastry Board board, quickly and easily and without breakage, by sliding them off the pan, as shown in the drawing.—G. E. Hendrick- son, Argyle, Wis. Sanitary Paper Drinking Cup When a drinking cup is wanted where there is none at hand, one that serves the purpose well can readily be made by fold- ing an ordinary sheet of paper. The strength of such a cup depends, of course, on the water-resist- ing quality of the pa- per; some cups of ' this type have held A water for 15 or 20 FR 7% | POPULAR MECHANICS the fingers to prevent the topmost side ti; from flying back. These steps are clea: illustrated in the drawing. Aside from their convenience, the cups are entire, sanitary, and, therefore, useful around picnic grounds and similar public plac: —Albert Perez, Nicaragua, C. A. Water Can for Grindstone The upper part of an old acetylene g: erator, such as was used for automo! headlights a few years ago, makes a ¢g water drip can for the grindstone. It fitted with an adjustable needle valve | regulate the flow of water. As such ge: erators are now seldom used one can | obtained for a small sum at almost an junk dealer’s.—E. T. Gunderson, Jr., Hu: boldt, Iowa. 0 Digging Clams with a Hoe As only the larger soft-shelled clams desirable for making chowder, sea-co residents who dig only a few dozen at time will save much back-breaking lal by using a cut-down hoe in the followi way: Walk slowly at low tide along most any hard, sandy beach inside an let or bay, looking for the telltale h: that betray the presence of clams. W!) one is seen, scrape away a few inches sand from the surface of the beach, a the size of the hole exposed will usua show whether the clam is large or sma However, do not be misled by the appea: ance of the hole on the surface, for ve . often waves, brea! vo ing on the beach the tide goes ou! almost close t holes, and one minutes before they a started to leak. - These cups are made in the follow- ing way: A square piece of paper is first folded diag- onally and the two upper tips folded over, one forward and the other back- ward. The two side tips are then folded back, one over the other, in such a manner that they lie ‘straight against the upper edge. To open the cup, the side edges are squeezed lightly between the thumb and forefinger, using one of Sanitary Drinking Cup Which Can Be Made in a Few Moments from a Sheet of Paper AH small hole indicat: asmallclam. Whe one is discovere dig down at on side of the ho! with the hoe fo about 8 or 9 in. a: then break aw: the sand on t! side of the exca\ tion, which perm! one to remove t! clam by hand. Bb working in tl way, few clams w be broken and the: is no need of actually digging out any b the larger ones.—John D. Mayer, N« York City. , é \ a iy apt to think that NL Will

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How to Make a “Straddle Bug” A Simple Sailing Model That Is Easily Built By WM. ATKIN Naval Architect \V tools are required to make the ailing model described in this article, there is no tedious shaping and carv- to be done on a hull. The hull in this lel—if it can be called by this name— thing but a simple framework to hold mast and three floats. This construc- while it does not give the model speed of a “regular” body, per- the boat to be knocked together — MAIN SAIL very quickly, and, despite the unconven- tional design, the little vacht is really a splendid sailer. Before going on with the details of con- struction, we will explain a few of the terms used in the drawings, to save trouble later on. The hull, or body of the boat, needs no description, nor does the mast. The latter, however, is braced by five lengths of wire; there are two on each side, running from a point near the top of the mast to the sides of the hull, and these LACED TO STAY 2X15 X30 CROSS ARMS, | SHROUDS - ei4 >) 3 x 1g X35 CENTERPIECE ----, 4 || / H ’ | ' / is sai J K ~——— 35 +4 1h, 1Sz ~ / | “ UDDER FLOAT ~m9 99 +4 / a 6-434) ma RD Al ‘43-4 BOWSPRIT? | fom Ef \ } ' j — \ secemnes eek > a sey ' 1 j stay} | . SCREW TO RUDDER-* || j Y LY 2 SCREWEYES _-- t J : t = TT = i FOR SHROUDS 4#}_-—————#k- —> Hf f . Fis.! Above, Elevation of the Simple Sailing Model, the ‘Straddle Bug” : Below, P'an and End View of Frame 103

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1034 POPULAR MECHANICS FRONT FLOAT,

j 2 REQUIRED ~_ ~ s 3-» Re ‘. ats Pe a oe aw —*, Nk : “a BRASS ee * PN nage - 5 SCREWEYE +-~" cat S\N : l

" FORWARD END / | % - BRASS WIRE \ (OF BOOM ee * ae / | | we x 2 ji \ Y i“ 7 \ ie LEACH ~// le ~ a | HOIST 18 / JIB —

} Details of the Frame and ~~ aug center” ; { Floats, and Dimensions of PIEC TAC Mast, Spars and Sails MAIN SAIL Fia.4 Fia.5 i

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POPULAR MECHANICS called shrouds. Another runs from e same point on the mast to the end of e bowsprit, and this is called the jib The bowsprit projects from the bow carry the end of this stay, and to the iy is fastened the jib, or triangular fore- The sail nearest the after (rear) end the model is the mainsail, and in this e it is a “jib-headed” sail. The sails lashed at the bottom to spars called main boom and jibboom. On the sails, e upper end is the head, the bottom is e foot, the side next the mast on the ainsail is the hoist or luff, and the oppo- te side, the leach; on the jib, the side at runs on the jib stay is the hoist, and he inner side sialon e leach. The SHROUD, 20- MAST 7 each of the GAUGE BRASS ~. ,ainsail is HEAD OF oached, or SAIL ~~~ urved, to make ae t keep it Ss RING ~~ HEM ~ hape. The ngle that the awvarp-- ails are al- n owed to take CROSS to the center- ine of the boat governed by ines. attached REAR OF to the outer HAY end of the main . boom and the ‘ nner end of the jibboom, nd these lines 1035 centerpiece, and glue to the underside a block 3 in. thick, 14% in. wide and 2 in. long, keeping the center of the block on the 3-in. mark. Drilla %-in. hole through both centerpiece and block, on the mark. Three floats must now be made. Make these of white pine or poplar, 18 in. long, 5 in. deep and % in. thick. On two of them, cut one end as shown in the draw- ing, so that the bottoms are 15 in. long, round off the beveled ends, and, from a point about 7 in. from the after end, taper the floats so that they are about \% in. thick at the after edges, then round these. Drill M%46-in. holes in the positions marked, and then fasten the floats to the ends of the crosspieces - SHROUDS ) with No. 6 ase brass screws, i 1% in. long. The third, or ' rudder float, is exactly similar : to the others, ' except that i only one \%¢-in. \- hole is drilled in it, exactly in the center, and but one screw used to fasten it to the center- piece, under the little block. Now drill two rows of e6-in. holes along the ire the main edges of the and jib sheets. centerpie ce lhe corner of (Fig. 6), spac- the foot at ing them '% in. Fic.6 hich the sheet ; apart, for the ‘ } es a Details of Shroud and Stay Fittings, Mainsail Lashing and Sheet : ft the sail is Pins and Holes in Centerpiece pins on the end fastened is the of the sheets, lue, and the opposite foot corner is the and cut out the mast step or hole. This tack. Now for the construction. hole is oblong in shape, 4% in. wide and % lhe frame requires three pieces of in. long. and should not be finished until hite pine or poplar, 34 in. thick by 1% in. wide. Two of these are 30 in. long and the third 35 in. long. Measure 4 in. from one end of the 35-in. piece and fasten one ‘U-in. piece to it so that the forward edge of the latter comes to the 4-in. mark, and the crosspiece is exactly central; use two No. 6 brass screws, 34 in. long. Fasten the other crosspiece similarly, so that the distance between the inner edges of the two is 10% in. Mark a point % in. from the two ends of each crosspiece and in the center, and drill %-in. holes, and 1% in. from each end drive in small brass creweyes for the ends of the shrouds. Measure 3 in. from the after end of the the mast is ready to be “stepped.” (See Fig. 4). All of the spars are also made of white pine or poplar, and, when tapering these as shown in the drawings, the best way to go about the job is this: Taking the mast as an example, cut it a trifle longer than necessary, and about 34 in. square. Still keeping it square, plane it down until it is 46 in. square at one end and % in. square at the other, the taper being straight. Now plane off the edges carefully until an oc- tagon is produced, and plane off the edges of this in the same wav. The mast can now be finished round with coarse and fine sandpaper without difficulty, cut to

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1036 POPULAR MECHANICS length, the top rounded, and the oblong step cut on the foot. Notice that the main boom and jibboom taper from the center to the ends, and that the bowsprit tapers and is round only for 15% in. of its length. The inner end tapers a little, but is kept square to make it easy to fasten it to the “deck.” Measure 38 in. from the deck shoulder of the mast and at this point drive in small brass screweyes to take the ends of the shrouds (Fig. 4). A piece of copper or brass wire is twisted around the lower part of the mast, 1% in. from the shoulder, and formed into an eye on the after side to take a brass hook on the end of the main boom. This is shown clearly in Fig. 4. Now step the mast so that it “rakes” or leans aft 9 in. from the vertical, measured at the top, and glue into place. The shrouds, which are of 20- gauge brass wire, can now be fitted. Each shroud is passed through the screweves on the mast, twisted as in Fig. 6, and, about 2 in. from the deck, is passed through a small brass ring, then twisted around itself and cut off. Now, fasten one end of a leneth of fine fishing line to each ring, and pass them several times through the deck screweyes and the ring (Fig. 6). By drawing on these lines or lanyards, the shrouds are set up (tightened) and the mast straightened. The shrouds should not be set up until the jibstay is in place or the mast may be sprung (bent). The stay is formed with a loop on the upper end that passes over the end of the mast and rests on the screweyes; the other end is fastened to a small brass screweve onthe Wire Attachment on End of Stick Facilitates Removing Clothes from Boiler end of the bowsprit, as seen in Fig. 1, The sails are made of light-weight per- cale, and must be cut so that a 3-in hem may be made on all sides. Remembe: that there is a l-in. curve (roach) on the leach of the mainsail and a slight roach (about 4% in.) on the hoist. The edges of the jib are straight. Twelve small holes are punched through the foot of the main sail and 15 on the hoist; if small eyelet like those used on shoes can be put these, so much the better—maybe the shoemaker will do this for you. Seven are also put through the foot of the jib, an: about 12 on the hoist. The sails are lace to the booms, stay and mast through thes eyelets by means of light fish line, shown in Figs. 1 and 6. There are tw small holes drilled at the head of the mas) to take the end of the lacing and make it fast, and similar holes in the booms. Thx lacing on the hoist of the jib can be take: to the shroud screweves and made fas! there. The only work left now is t! sheets. These are also of strong fish lin: One end of the jib sheet is fastened to th: after end of the jibboom, reeved throug a screweye near the after end of the boy sprit and passed aft; it is then cut off nea: the end of the row of holes in the cente: piece, and fitted with a pin made of bra: wire (see Fig. 6). The main sheet is fas tened to the after end of the main boon and leads down through the screweye i: the end of the centerpiece, then forward The rudder screw should bind the rudder float tightly, but not so tightly that the float cannot be moved with the fingers. A Handy Tool for Washday Most women use a short piece of broon stick for lifting wet clothes out of the boiler. The trouble with a round stick is that the clothes slip off while the stick i being turned to wind them on. A lengt! of heavy galvanized-iron wire, bent and inserted through two holes drilled i: the stick, as shown in the detail, will elin inate the trouble entirely. When th: stick is turned the wire catches in the clothes without any danger of teavin: them, and they can then readily be re moved.—E. K. Wehry, Cedar Rapid Towa. @Short lengths of %-in. pipe driven a! the corners of the flower beds prevent the hose from dragging over the bed an: knocking down the flowers. The pipe should be at least 18 in. long and shou! extend 6 in. or more above the ground.

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jeccek ge dG S S z All Shop Notes published in 1924, in book form—Fifty Cents—from our Book Department A Sewer-Pipe Septic Tank By EARLE W. GAGE ‘* )UNTRY homes are fast coming to enjoy city conveniences, and the in- ensive, easily built septic tank is aid- in this, since it brings a home sewage nt within reach of the 6,500,000 farm mes. Until now thousands of country le have not installed sewage systems Septic Tank of 24-Inch sewer Pipe That Can ily Be Made by Any rmer and Will tve a fousehold of Four Per- sons the Year Round WML 2 because they believe that the cost is low in the city but high in the country. This is not so according to figures collected by ii Me experts of the P department of agriculture; referring to one city in the east, where the average home is valued at $10,382, the average charge for sewerage, outside the house, 1s $335. On the other haad, an average country home in the middle west is worth $17,259 and yet a farm sewage-disposal system can be installed for less than what city folks pay tor this convenience.

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1038 Safe disposal of farm sewage is not a passing fad, but a vital necessity, cautions A good plant the experts of Uncle Sam. 4°VIT-PIPE LINE FROM / HOUSE ISTCHAMBER .“ ! 2N° CHAMBER A

_- PLANK COVERS --», POPULAR MECHANICS siphon may be omitted in those rare in stances where it is feasible to discharge into salt water or into a large stream al- ‘+ 4’ VITRIFIED PIPE TO DISPOSAL FIELD. { __ DOSING CHAMBER PERFORATED ' / VITRIFIED COVER

POURED JOINTS —----*> GASKET--~~~<

Sectional Eleva- tion of the Sewer- Pipe Septic Tank, Showing How the Sections Are Con- nected

because it is the healthfulness of the for the purpose greatly promotes country home. Before undertaking construction, how- ever, it is best to prepare a definite plan. The septic tank should be located from 50 to 100 ft. from any dwelling, and, if practicable, to the leeward of prevailing summer winds. The sewage-distribution field should be located downhill from any well or spring, and if possible at least 300 ft. from such water supplies. The dis- posal of all sewage should be through dry, porous, deeply drained ground. The dis- tribution of the sewage in the land should be so apportioned that all of it is thor- oughly absorbed and oxidized. Always lay sewers straight and below the reach of frost, ventilate them thoroughly and make the joints water-tight and _ root- proof. Makeshift methods, materials and — devices should be avoided or used spar- ingly. Vent pipes should never be placed in the top of septic tanks or cesspools where they are near dwelling houses. In the construction of a sewage-disposal an asset, ot plant, the siphon or dosing chamber and

BILL OF MATERIAL (1) 4-6X6 T-BRANCHES (9) 1-610 4 REDUCER (2) 2-90°LS (0) 1- 3° SIPHON (3) 3-6 VIT. DRAIN TILE (11) 1- FOOT LENGTH VIT, PIPE 4) 1-2470 6 DOUBLE T-BRANCH ()2) 1- SACK CEMENT (5) 4-24T06 T-BRANCHES (132 FOOT SAND (6) 4-24" LENGTHS (4)3 FOOT GRAVEL (7) 3-PERFORATED VIT.COVERS (5)3 PLANK COVERS (8) 1-410 € INCREASER (16)100 LB. JOINT COMPOUND

ready badly polluted. Disposal of sewace in a running stream should be a last resort. as such practice endangers water supplies downstream, and unless the volume ani velocity of flow are good, may be very ob- jectionable. It is economical and easy t make a septic tank out of sewer pipe. The vitrified-clay pipe will last almost a life time and give good service. The accom panying illustration shows how the pipe should be placed. The construction of the tank calls fo: eight sections of 24-in. sewer pipe, each 3!) in. long, comprising four sections of plain 24-in. pipe and four sections with 6-in side branches. Four 6-in. tees and two © in. bends or ells are also required, besid two 4 to 6-in. increasers and several se tions of plain 6-in. pipe. Proper fitting 0! the connecting line requires the t\ chambers to be placed about 4 ft. apart The depth of the excavation and level the column base depend upon the lev« of the inlet from the house sewer, as \ be seen in the drawing. The bases are ©! cemented brick or concrete, 30 in. square and a plain section of 24-in. pipe is plac

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9 POPULAR MECHANICS 1039 n each and cemented into place with els of cement mortar inside and outside pipe. [he remainder of the structure, includ- the inlet, connecting pipe and outflow es should be assembled loosely before more cementing is done. [wo 24-in. pipes with side branches ould be placed above the pipes already position. Cement the two sections to- ther, calking the upturned bell joint th a small quantity of oakum or hemp, d pour cement grout into it, of the con- tency of thin mush. The branches of two lower pipe sections should be inted directly toward each other, and ose of the upper away from each other, e in the direction of the disposal field, d the other toward the 4-in. inlet from e house. Then the remaining plain sec- ns are installed. The inlet consists of t-in. houge drain connected to a 4 to 6- increaser, a 6-in. tee, and a 6-in. ell, the tter being cemented into the upper 6-in. Light, Portable Sawhorse Sawhorses are usually too clumsy to irry-around, but where portability is re- uired, the folding sawhorse shown in the iotos and illustration will be found very seful. An additional feature, which akes them convenient, is the small space equired to store them when not in use. ach horse is made of 2 by 2-in. or heav- stock, and a length of broomstick is issed through all four legs at the point ndicated to serve as a pivot. Another ength of broomstick is used as a cross- SAWBUCK OPEN side branch in the first chamber. The out- let is similar and may be connected to the line leading to the disposal field. The outflow should be below the inlet. The dosing chamber shown at the right of the second chamber is not necessary when the liquid outflow is discharged into a watercourse or a leaching cesspool. However, if this method of disposal is not practicable, for the reasons outlined pre- viously, the dosing chamber may be con- structed of a 24 to 6-in. double-tee branch and a 3-in. siphon, set in concrete and con- nected in the outflow line as shown in the drawing. The covers for the vents are of vitrified tile and are perforated; those for the three chambers are made of wood. All the joints must be thoroughly tight, and be grouted with cement or a bituminous compound. There are special joints made for work of this kind, known as “flex- form” joints, and the use of these will obviate any trouble due to settling of the earth around the pipes. piece, where a larger piece would be in the way when the horse is folded. The whole device weighs only about 6 lb.—Dale R. Van Horn, Walton, Nebr. Shellac over Sap and Knots White pine, or any white wood that re- quires treatment to prevent the penetra- tion of sap or knots through white paint, should be given a thin coat of white or bleached shellac. It may be applied di- rectly to the wood, which is the most com mon way, or on a primer of lead paint, BROOM _ HANDLES 1 eee ee Folding Sawhorse Made of 2 by 2-in. Material Can Be Carried Around Conveniently, Stored in a Small Space and Weighs Only Six Pounds

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1040 POPULAR Portable Ditch Bridge On the sides of almost road there are ditches, be crossed with cars. every graded which must often A convenient meth-

drawn from the /| — circumferencetoa | °* | } 2-in. circle, con- \ Nae centric with the \ 8-in. disk, as shown in the drawing. About Me in. tothe left of each radiat- ing line, another one is drawn, parallel t the former; slots should be cut in th: disk on these lines with a very sharp knit to insure clean edges. By referring to tlie drawing, it will be seen that the ruling edge (to the right) should be slightly longer tha: the other to prevent confusion when 1: use. A small piece of cardboard, the edg: of which are drawn by setting the co: passes to the 4-in. radius of the disk, a: the length of which is sufficient to rea: over two segments of the disk and aiso t take two thumbtacks for fastening, used as a vernier gauge. To use the ruler, it should be place concentric with the drawing to be made; small pinhole in the center makes this po sible. To divide a dial in 10° division the vernier is not used, and it is only nece sary to draw lines in each slot. To mal finer divisions, place a pin in the center « the disk and fasten the vernier against t!

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POPTI ve of the former. After drawing the nes move the disk to the right un- e A points to the next line on the er for 30-minute divisions, etc., con- ¢ the drawing of lines all around the The further application is us. For inking lines, the disk d be elevated at the center by cardboard circle, concentric A and B represent This ruler can in the ruler. iwing edges. ‘<1 on work from 2 to 8 in. ter. lesired, concentric circles can iwn on the large disk, about ipart to mark off the radiat- nes so as to act as guides for mining lengths of division here the drawing is not to e a circular boundary for such In this every fifth line can be drawn longer for rast on the dial drawing and will be unnecessary to have cular boundary drawn to in- equal lengths of such lines Wa\ or Cheap Homemade Tractor 'LAR MECHANICS 1041 Novel Shoe Store section of an eastern find an odd canopied of a merry-go-round, In the children’s shoe store one will stand in the form

ood serviceable tractor, which ie work of four mules, was - , : % rR : ‘ a Novel Stand, with Canopy, Animal Seats and Painted Decora- vy a Georgia tarmer trom tions, Proves Drawing Card for Children in Shoe Store costing only about $250. Of liscarded Ford automobile — which worth about $50—he used the en front wheels and steering apparatus, purchased a pair of regular tractor eels for $165. A homemade frame was made and the engine shaft cut off to his tractor can turn around in a 17 ircle and is useful for all kinds of heavy uling and farm work. By jacking it up using a special flywheel, it can also be | tor belt work. The accompanying to shows the tractor as it is used to a mower. A top is provided to fur- shelter from sun and rain. emade Tractor by Old Auto- ile Engine and isting of Front eels and the Steer- Apparatus of Dis- ded Car, with gular Tractor Wheels in Rear with several seats mounted on it, as shown The are de rabbits, geese, goats take great de in the photograph. signed to resemble and horses, and children light in getting on the stand and sitting on one of these animal seats, while the clerk fits their shoes. The proprietor has found this affair good advertising, as its novelty not only impresses people but when the children need shoes they inevi tably ‘ome, mama, let's go to the animal shoe store.’"—Mrs. David M. Me Pherson, D.C seats _——,. “. Vashington,

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HE twist drill is a special cutting tool — generally formed by milling a cylindrical piece of tool steel, or by forging and twisting grooves in a flat strip of that material. The drill may be divided into three principal parts: the point, the body and the shank (Fig. 1). The cone- shaped surface at one end of the drill is called the point. Two spiral grooves run along opposite sides of the drill; these are known as flutes and are shaped so as to do four things: First, they help form the proper cutting edges onthe cone-shaped point; second, at their junction with the cutting edges they are shaped to curl the chip taken from the work tightly within itself so that it occupies a minimum of space; third, the flutes form channels through which the chips es- cape from the hole, and fourth, they allow the lubricant to get down to the cutting edges. The CUTTING LIP, AB Bo 4 “CUTTING LIP THE POINT Courtesy Cleveland Twist Drill Co. € 1042 LIP OR CUTTING EDGE -----=. FLUTE--- Fic.! a ‘ a dead center (Fig pepe is the sharp edg: \ the extreme tip : of the drill ' e formed by the int section of the c 1 shaped surface __ Bopy _ =. al ELEARANCE | Shou d always ; the exact cente: | the drill. The } of the drill s! Boor -- , not be confused | the dead center } former, as the pia, ~~——~ ~~~ is used in this art AXIS ~-MARGIN means the. ent OF DRILL cone-shaped surface at the | ting end of the drill. The is the portion of the point of the lips or cutting edges lips (sometimes called cutt lips) are the cutting edge the drill; they are formed b) intersection of the flutes and point. -Of course, a real ting edge would not be for: at this intersection if the face of the point were at a 90° angle to the plane ot tation, as shown at the leit Fig. 2. Under this condition edge would merely be a sq corner, too blunt to penet! Therefore, in order to git real cutting edge to the lip, surface of the point -SHANK ground away, or reli¢ just back of the lips shown at the right in fF) This relief is called clearance. Lip clearan -- TANG ' the shape of the point 1 lation to the lip, and 1s

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POPULAR MECHANICS 1043 he most vital subjects discussed in this cle Improper grinding of the lip irance is a frequent cause of disaster. narrow strip between A and B (Fig. called the margin. It is practically full diameter of the drill and extends entire length of the flute. The surface m B to C (Fig. 1) is of smaller diameter n the margin, and the depression thus med in the body is known as body rance and reduces the friction between lrill and the walls of a hole, while the rgin (which is of full diameter) insures hole being of accurate size. It there The Drill on the Left Has No Lip Clearance; re no body clearance, more power That on the Right Is Properly Cleared ild be required to overcome the fric- | between the drill and the walls of the —— and this friction might be sufficient to draw the temper of the drill itself. : The | Fia.2 wel is the metal column that separates the lutes, and it runs the entire length of the 1 between the flutes as shown in Fig. 3. e web is the supporting section of the the drill’s backbone, in fact. It dually increases in thickness toward the nk (Fig. 4). This thickening of the gives additional rigidity to the drill. e section shown at the bottom in Fig. 4 as cut from a drill near the point and he section at the top near the shank. The | ference in thickness of the web at these nts is shown by the small figures be- een the two sections. The kening of the web as it nears he shank naturally decreases he area of the flutes, and, un- ;s compensated for in some inner, this would seriously inder the chips in their escape from the hole. Therefore, order to offset Fic.3 Fic. 4 Left, Web of Drill; Right, Sections of Drill Cut near Point and near Shank; Note Dif ference in Thickness Fie. 5 be : 7 | Bit-Stock, Straight, Taper and Ratchet Shanks

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everTe 1044 the thickening of the web, the flutes widen as they approach the shank, thus keeping their sectional area substantially the same throughout their length (Fig. 3). The shank is the end of the drill that fits into the socket, spindle or chuck of the drill press. There are a number of types of shank, the most common of which are shown in Fig. 5. The tang (Pig. 5) is usu- ally found on taper-shank tools only. It is the portion of the tool that fits into a slot in the socket or spindle. It may bear a portion of the driving strain, al- though its principal use is to make it easy to remove the tool from the socket by means of drifting. Fully 95 per cent of the difficulties en- countered in drilling arise from faulty grinding either of the point or of the lip clearance. In grinding a drill, three things must be considered: first, the lip clear- ance; second, the length and angle of the lips; and third, the location of the point and dead center in relation to the axis or center of the drill. Lip Clearance Lip clearance is most generally mis- understood. Lip clearance as stated be- fore, is the relief given to the cutting edges in order to allow them to enter the metal without interference. To make clear just exactly what lip clearance is and does, let’s look at a drill without any lip clear- ance (Fig. 6). Imagine this drill trying to cut into a piece of steel. It would be impossible, because the surface S would always be in contact with the metal, and would effectively prevent the cutting edge from biting farther into the metal. Such a drill would merely rub—around and around—without penetrating. Therefore, if the lip is to penetrate, if its edge is to cut, we must grind away the surface S back of the lips (this is called giving the drill relief). This is shown in Figs. 2, 7 and 8 A somewhat similar purpose is served by the bevel or relief that is given the bit in a carpenter's plane (Fig. 8A). This lip clearance is very important; in fact, the effectiveness and life of a drill depend to a large degree on the correct forming of this clearance. Bear in mind that it is not merely ground on the cir- cumference of the drill but is applied to the whole surface of the point S, back of the lip. The heel (surface of the point back of the cutting lip) should be ground away from the lip at an angle of 12 to 15°, as in Fig. 9. In all cases, this angle of 12 to 15° is the angle at the circumference of the drill. This angle of lip clearance should POPULAR MECHANICS be gradually increased, however, as center of the drill is approached, until 1 line across the dead center of not less than 120° or it may be as m as 135°, as in Fig. 10. For heavy feeds soft material, the angle of lip cleara may be safely increased to the full Care should be taken, however, to that the angle at the center of the drill near the tip—is increased proportional! If the angle of lip clearance is too gr the edges of the cutting lips will bre down (as in Fig. 11) when the drill st to work, because they will not have sufi cient backing to support them, just razor would break down if used to cut 1 because it is too thin and lacks sufficie: If insufficient support to stand the strain. surface is ground away, in other words the angle is made less than 12°, the cle ance of the point is so reduced that ceases to be a cutting edge and refuses t bite into the metal—as in Figs. 2 and ¢ and this condition may result in splittir the drill up the center (Fig. 12). Requirements of the Lips After we have properly ground point, so that the angle of lip clearanc: correct, our work is only half done must now cross-check our point grindi: and assure ourselves that, first, the t lips are the same length, and second, t angles of both lips, in relation to the a of the drill, are equal and correct (Fig. 1: The angle of 59° is recommended as t best for ordinary purposes. If the lips at the same angle to the axis (59°) and equal length, the third requirement good grinding, namely, the central lo tion of the point and dead center, will | fulfilled. If the angle of the cutting ed is more than 59°, as in Fig. 14, the d will not center properly, because the co: shaped point, which should hold it position, will be too nearly flat to perfo: this work. If the angle of the cutt edge is less than 59°, as in Fig. 15, the t drills much less rapidly and more poy is required to drive it, because of the ad tional length of the cutting edges. li get the point in the center but differ angles on the cutting edges (Fig. 16), t drill will bind on one side; only one |! or cutting edge will do the work, with 1 sultant rapid wear on this edge, and t hole will be larger than the drill. pose we get equal angles on the cutt edges, but, on measuring, we find the |! of different lengths: then both the p: and lip will, of necessity, be off cent The result will be a hole actually lars of the drill stands at an angle with the cutting ede, Or su the i

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POPULAR MECHANICS 1045

CUTTING LIP

i Fic. 8-A Showing the Bevel, Relief or Lip Clearance That Is Given a Carpenter's Plane, C Being the Clearance Angle; Practically the Same Purpose Is Accomplished by the Lin C'earance Given a Drill. It Permits the tom Edge to Penetrate the Meta

Fic.6 Fis.7 Both the Cutting Note How Much Lip and the Heel, Lower the Heel S. Are in the Same Line, B, Is than the Plane Cutting Lip, A

1] Fic.8 it Fic.9 The Cutting Lip Has Already Removed Considerable en of the Heel as Showing the Proper Way to Grind the Surface Indicated by the lack Portions of the Back of the Cutting Lip; the Angle Indicated Hole on Each Side of the Drill Is the Angle at the Circumference of the Drill. This Angle Should Be Increased as the Center of the Drill Is Approached so That the Dead- LESS <n on cae nee Center Angle Is Correct THAN 12°TO 15°--- \20" 70

Fic.10 Showing One Way to Gauge the Correctness of the Lip-Clearance Angle by Means of the Dead-Center Angle

Fic.11 Showing the Result of Giving , re 12 a Drill Too Great Lip Clear- sis Gan = aah oe Den, This Drill Was Given Insufficient Because of insufficient Sup- Lip Clearance; as a Result There | port Ceased to Be Any Cutting Edges and the Drill Split up the Center

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1046 than the drill (Fig. 17). The effect of this condition is the same as if the axle of a wheel were placed anywhere outside the exact center of the wheel. The strain on the drill press, in such a case, is tre- mendous and causes “weaving” or wob- bling of the spindle, rapid wearing away of the drill and breakdowns from strains on spindle bearings, etc. Where we com- bine both of the above faults—unequal angles and lips of different lengths—we have the very peak of abuse. Under these conditions, the hole is larger than the drill and the strain on both the drill and press is terrific. (Fig. 18). Particular attention is called to Figs. 16, 17 and 18, showing the results of un- equal angles and lengths of cutting lips. Notice how much larger the hole is than the drill. Also notice, where the lips are of unequal length (Fig. 17), that the short Fic.13 The Lips of This Drill Are of the Same Length and at the Same Angle to the Drill Axis Fic.16 In This Case the Angles of the Two Lips Are Dif- Fic 14 The Angle of These Lips Is Considerably More Degrees; as a Result the Drill Is Will Fail to “Center” Fig.17 Here the Angles of the Lips Are Equal POPULAR MECHANICS lip cuts the smaller hole while the lo lip cuts the larger hole, and how far fr: the true center the tip and point ot! drill are located in these figures. causes a strain that results in sidepla the drill-press spindle. Rake Angle Another part of the drill, on whic perfect action largely depends, is the angle. This is the angle of the flute i: lation to the work, as shown in Fig If the rake angle were 90° or mor: would not make a good cutting edge it is ground with too small an angle, | ever, it makes the cutting edge so thin t it breaks down under the strain oi work. governs the tightness with which the c| curl within themselves and hence amount of space that they occupy. Ot In addition, the rake angle part ¢ Fic .1S Here the Angle of the Lips with the Axis of the Drill Less than 59 Degrees than 59 Fic .18 The Angles of the Lips but the Are Different and the Lips ferent; Note That the Lengths Are ifferent: Are of Different Lengt Hole Is Larger than the the Drill Punishment Is Note = - og hape Dnill Terrific of t ole © Cleveland Twist Dr

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POPULAR MECHANICS 1043 ver ( itions being the same, a very great ! angle makes for a tightly rolled chip be changed except under special condi- tions, which will be considered later. For ordinary drilling, the rake angle estab lished by the manufacturer of the drill is correct and should remain unaltered. Fig. 19A shows the rake angle on a carpenter's FIG 19 A ke Angle on Plane and a Lathe Tool; Compare with Rake Angle on Tool Shown Below FiG. 19 Rake Angle Is the Angle of the Flute in Relation to the Work hile a rather small rake angle gives the ip a tendency to curl into a more loosely led spiral. The should not plane and a lathe tool, and the purpose of rake on a drill is the same anglea a ’ rake angie Continued Next Month Remedying Worn Spindle Washers loosened, which is equally undesirable \ simple remedy for this trouble is to replace the spindle washer with a new one, ll take up part of the play, and which wil hand as fat When tightening Ford front-wheel ball irings, which need a more caretul ad tment than roller bearings, it is some es found that they are too tight or too se after pulling up the locknut. If the rings, and spindle threads are l, the cause of this is usually that the ndle washer, and the tongue and groove the spindle, are worn. When the lock is pulled up, the spindle washer and also to turn up the washer by as possible beiore tightening the nut; this takes up the wear in one direction lo guard against the cone turning back, when loosening the nut in case the adjustment is too tight, the angle of the flats on the cone should be carefully noticed loosening the nut cones before ne are carried with it for a fraction of a rn, which makes it too tight. When the knut is backed off for another try, ’ sher and cone are carried with it and The cone can be reset by tightening it slightly to loosen the ad justment, because it has al ened by removing the Gunderson ready been loo locknut.—E. T. Jr., Humboldt, Lowa.

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1048 POPULAR MECHANICS Protecting Bees from Ants Every season thousands of farmers and bee raisers throughout the country find that ants and other crawling insects enter Wop wll ‘a ~- we, ow Fa Protecting Beehives from Ants by Placing Legs of Stand in Cans Filled with Water the beehives and inflict considerable in- jury on the swarms, sometimes destroy- ing them entirely. Many methods of guarding against these enemies have been tried with more or less success, but an ef- fective barrier is provided against ant invasions by placing the hives on tables and setting the legs in small pails filled with water. Obviously the ants cannot get at the hives as they would have to cross the water to do so. It has been found advisable to mount three or four hives on one table, which is made of 2-in. planks held together with cleats. Holes, about 2 in. in diameter, are drilled in the ends of the cleats and the legs driven into these. The legs are set in small pails and the pails are filled with water. This method of protection has been tried and found entirely satisfactory—H. H. Sie- gele, Emporia, Kans. Water for Hardening Good tool steel of high temper is very sensitive to differences in the water in which it is hardened. It has frequently been found that a tool which hardens per- fectly in soit water will not harden nearly as well under the same conditions in. hard water. If soap, greasy matter or dyes are present in the water, the steel will some- times not harden at all. Distilled water is ideal for hardening and this can readily be collected from the exhaust pipes of a steam plant. It is also important to | plenty of water available and, if poss to have the water running slowly. \\ an insufficient amount of water is u the first steel hardened will be quite s factory, but if the same water is used peatedly, it soon becomes too hot t effective. In general, good tool should require no admixture of chemi: to the water; the purer the water more satisfactorily it will harden the st Effective Calf Weaner Calves and colts are often difficult wean and patented devices do not al prove effective. A simple weaner, w! will be found satisfactory, can readil\ made from a 10-lb. lard pail, the bott of which is removed and the edges lx over so that there are no sharp pro; tions. Ordinary bit straps are attached that it can be held in place over the mout The animal can pasture in grass an able to drink, but cannot suck.—R Meeks, Manville, Alta. Easily Made Distilling Flask The chemical experimenter will fin discarded electric lamp, of 75-watt or larger, useful for distilling liquids in t! laboratory. Take a knife, or any simi! sharp instrument, and turn up the bra screw ca] Then wit! pair of pli give the ca few twists break up glass filan holder is « posed. | delicate tion now lows: W a narrow glass held the filame leads so t! it can be removed. The rough edg should be filed down smooth. length of glass tubing, heated and b« to the shape shown, is inserted throu a cork which fits the open end of flask. It can then be filled with liqu and placed over a Bunsen burner.—Ha: Faller, New York City. hand ceme! so that t! of the ope: break t!

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VVVVVVVVVY WELL Johnny, are you ready for vour gear lesson? I don't suppose vill run into any more trouble with ev jobs after yesterday's session, will ’ Bill grinned at the apprentice, o grinned back as he replied, “No, sir!” \ll right, Johnny,’ — pulling some eets of paper from a drawer in the desk here we go. The principles that we plied to the figuring of pulley sizes and eeds also apply to the same problems vearing, whether straight gearing or el: the calculations for helical gears, BY JAMES TATE or, as many shop men call them, ‘spiral’ (although this term is wrong), you will not have to bother with for some time. “If we have two gears running together as in this sketch (Fig. 1), the product of the diameter in inches and the revolutions per minute of one of them will equal the product of the diameter and r.p.m. of the other. In dealing with gears, however, we do not often refer to them by their diameters, but by the number of their teeth. You know that vou are sent to the store- room for a 24-tooth gear, not for a 6-in. 24 TEETH wy EXAMPLE |! TEETH | L/ 48 week lp 24 TEETH 100 RPM. intTERMEDIATE GEAR Ficg.2 Fig. 1, Simple Gearing, Illustratin with Intermediate Gear; Example 1, Illustration of Simple Gear Calculation tt) al the Reiation between Tooth Ratios and Speed; Fig. 2, Simple Gears 1049

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1050 one. In gear calculations we can use the number of teeth just as conveniently as the diameter, so that-the rule above could be given this way: The product of the number of teeth in one gear, and its r.p.m., is equal to the number of teeth in the other, multiplied by its revolutions per minute. “For example, supposing one of the gears has 24 teeth and its speed is 100 r.p.m. and the speed of the other is to be 50 r.p.m., it must have 48 teeth, because the product of 24 and 100, the numbers relating to the first gear, is 2,400, which is also the product of 48 and 50. Now, look- ing again at these figures, don’t you notice anything else about them? See, the small- er gear has exactly half the number of teeth in the larger and revolves at twice the speed. This gives a clue to the figuring of gear speeds, doesn't it? “The simple rule for finding the speeds or numbers of teeth in gears is: Take the gear of which you know both the r.p.m. and the number of teeth and multiply these two numbers together. Divide the product by the number, whether number of teeth or r.p.m., that is known about the other gear, and the result will be the num- ber you require. “Suppose vou have a gear witli 40 teeth, running at 250 r.p.m., and you want it to drive another gear on a shaft that is to run at 200 r.p.m. How many teeth must you have on the second gear? Multiply 250 by 40; the result is 10,000. Divide this by 200, and the quotient, 50, is the number of teeth you require. Instead of figuring the sum out in this long manner, however, set the problem down in the form of a frac- tion (example 1), as we did in the case of the pulley calculations. Now we can strike out al! the the lower line against those in the upper and divide the 2 into the 4, leaving only the 25 to be mul- tiplied by 2 to obtain the answer “In calculations of this sort, it is always best to state the probiem in the form of a fraction. Not only do you but it is very easy to check over the fig ures, while if there are several multiplica tions and divisions scattered over the pa per it is sometimes difficult to check the result, or to find an error. This is not so important in a simple problem like the one we have just dealt with, but in figur- ing a train of pulleys or gears a lot of time is saved, and chance for error is lessened. “When two pulleys or gears are running together, one driving the other, the first is called the driver and the second the fol- lower. You noticed before that it is the larger gear that runs slower, and the pro- zeros in save time, POPULAR MECHANICS portion formed from the revolutions and diameters, or number of teeth, is called an inverse proportion, because the larger pu! ley runs at the slower speed, and the smaller pulley at the faster speed. Hence we say that the speed of a pulley varies versely as its diameter, or teeth. “The first sketch (Fig. 1) shows simplest form of gear train, one driver one follower. This sketch (Fig. the same gears A and B, but with an termediate gear, C, between them. 1 intermediate gear reverses the direct of the follower, and may be used for t! purpose only, or may be employed to c nect A and B without using larger g« In this form of gear train, the gear ( no effect on the speed ratio of the ge A and B. Each will revolve at the sa speed as they would if the intermedi gear absent In other words speed ratio of the gears in both sket is the same, 2 to 1. “When it is desired to make a great change in speed, it is necessary to use two or more pairs gears to do the job. This is also nec 2) sho were —" practi 1 sary, for example, in lathe work, whet thread must be cut for which simple g« ing will not serve \ train of gears two or more pairs in it is called compou gearing. The back gearing of a lathe another example of this “Here is a common example of co! pound gearing (Fig. 3). In this sket A drives B, and C, which is keved to same shaft as B, drives D. A and C the drivers, and B and D the follower Suppose A has 36 teeth; B, 60 teeth 18, and D, 72 teeth; if A runs at 200 r.p.1 what will be the speed of D? The ru for finding this is exactly like the one u in a similar case for pulleys. Mult the speed of the first driver by its nu ber of teeth, and by the number of teet in all the other drivers, and divide product by the product of the number teeth in all the followers. In this ca we multiply 36 by 200 and by 18; the pro uct is 129,600. Multiply 60 by 72; 1 product is 4.320. Divide the second prt uct into the first, and the quotient, 30 the answer we are looking for. “See again how much time is saved the fractional form of the calculation (e ample 2); 36 divides into 72 evenly; 6 divide both 18 and 60; the resulting divides into 200, and the 2 below the | into the last 20. All that remains is multiply the 3 and 10 and we have answer. “If we had known the speed at wl the shaft on which gear D is fastened

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POPULAR MECHANICS 1051

COMPOUND GEARING: DOUBLE BACK-GEARED LATHE HEADSTOCK re REVERSE SPINDLE 727 dll st

= Ce : = ‘ ; LEAD : SCREW —f — 3 a jE weer | SIMPLE GEARING ON > LATHE: WITH INTERMEDIATE 36 xX 18x 200 _ 3X10 _ 30 OR IDLER GEAR 60x 72 ' 19 2 os yp REVERSE EXAMPLE 2 Jas ; «6SPINDLE | iO (Soa, 4 36x ix 206 _ 2 « , ~~ G@xZG °§}§ 3 . i. | EXAMPLE 3 0; | pitting” f 36 _ 3x12 %~ i2 2x6 | _\ (a) ; © > % _(3X6) x (12x4) | Es % ~ Sy, » s - (2X6) X (6x4) | 7, y =| 6) IDLER es A o b ——_ - 18x48 1224 COMPOUND GEARING ON LATHE: (c) | WITH INTERMEDIATE OR | IDLER GEAR 36 T. SJ AAA, iv p! S | 2 03 © oN ha F ISORPM 50 RPM. SATO Oh COMPOUND GEARING ; RATIO 3:1 EXAMPLE 4 _EXAMPLE 5

Above, Example of Compound Gearing; Left, Above, Simple Lathe Gearing, with Idler; Left, Below, Com- pound Lathe Gearing with Idler; Illustrations of Compound-Gearing Calculations and Figuring of Gear Ratios

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1052 to run, and knew also the speed of gear A, and the number of teeth in gears A, B and C, but wanted to know what size of gear D must be, the problem would be similar (example 3). Multiply the speed of the first driver, 200, by the number of teeth in it and in the other driver, 36 and 18, and divide by the product of the r.p.m. of the last follower, 30, and the number of teeth in the known follower, 60; the result is 72, the desired number of teeth. “Now, having all this clear in your mind, suppose you knew only the speed at which the first shaft runs, in this case we'll say 150, and the speed at which you desire to drive the last shaft, say 50, how would you select the gears? Set down the 150 and 50 in the form of a fraction (example 4). This represents the ratio that the speed of the first shaft has to that of the last. But a ratio of 150 to 50 is the same as 3 to 1, so we call the latter the speed ratio. Now, what gears can we use that have a ratio of 3 to 1? Gears with 12 and 36 teeth will do, provided that their center dis- tances, when mounted on the shafts, will be correct. This is a matter for a de- signer and for more extended calculation, but we will suppose that gears having 12 and 36 teeth will fit. If the 12-tooth gear runs at 150 r.p.m., the 36-tooth ‘one will run at one-third this speed, or 50 r.p.m. Simple enough, isn’t it? Suppose again, however, that the 12 and 36-tooth gears won't meet, what shall we do? This is perhaps a case for larger gears, in which case we could use gears of, say, 20 and 60 teeth, or any others with a ratio of 3 to 1; we might also use an intermediate gear Handling Heavy Linoleum Rolls When large and heavy rolls of linoleum, carpet or similar materials have to be handled and shown in stores, the work can SLOTTED ---- > PIN 7 L. CASTER Device in Store Supporting Large Rolls of Liholeum or Carpet Aids in Showing Them to Customers be facilitated to a great ex- tent by placing the most used POPULAR MECHANICS with the 12 and 36-tooth gears, if the rection of motion of the last gear would be correct, or else we must use compound gears. Let us go back to the 36 to 12 ratio (example 5); suppose that the gears available have 12, 18, 24, 28, 32, 36 a; 40 teeth, increasing by four teeth from to 100. Resolve the upper and lower fis ures of the fraction into their fa tors (see a, example 5); in this case t factors are 3 and 12 above the line and and 6 below. Let us call 3 (above the lin and 2 (below the line) one ‘pair’ of factor and 12 and 6 another pair. Now multip each pair by some number, not necessat the same in each case, that will give values corresponding to the gears we | on hand. That is, multiply the 3 and by, say, 6; this will give us 18 and 12. The multiply the other pair by 4, whi gives us 48 and 24. This gives us 18 a: 12-tooth gears as drivers and 48 and tooth gears as followers. “Another method is as follows: Su pose our ratio is lO tol. Select two gear say of 12 and 16 teeth to use as follower Multiply 16 by 12; the product is 19 Now the drivers must have a product t times as great, or 1,920. Select a gear tl we happen to have on hand, and see if t! number of teeth in it will divide ever into this number. If we use a 60-toot gear, and divide 60 into 1,920 the quotient is 32. We may then use 60 and 32-toot gears as the drivers. This will give a spe: increase of 10 to 1. If the speed is to | reduced in this ratio, of course the 12 a: 16-tooth gears will be the drivers and t! 60 and 32-tooth gears the followers.” rolls on a device of the kind shown in t!] drawing. The rollers are made of wo 2 or 3 in. in diameter and about one-| the length of the roll of material to placed on them. Pins, driven into tl] ends of the rollers, act as spindles rest in bearings, made from large ans irons, which are screwed to a woods base made of 2-in. material. The ba is provided with casters.

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POPULAR MECHANICS 1053 Thinning Oil Paint with Water ace 1 lb. of white shellac gum and '% f sal soda in a porcelain vessel and r with water. Put the vessel on the e and bring the water to the boiling nt, letting it boil until the gum is en- . dissolved. Then remove it from the and allow it to cool, after which the id may be stored in bottles. Add % of this liquid to every quart of paint: well, and after the paint becomes k, add cold water to bring it to a paint- consistency.—A. A. Kelly, Malvern, nsylvania. Watering Roots of Plants \Vhen water is poured on the ground ound a shrub or plant it spreads out over arge area and flows away—especially if e soil is hard—with the result that the its do not get the needed moisture. uring a recent drought, when plants d shrubs needed constant care, I found the method shown in the drawing en- tirely satisfac- tory. A hole, 3 or 4 in. deep, is made in the ground, close to the root and a bottle full of water is inverted and set in the hole. A milk bottle will do very well for shrubs but a pop bottle is better for small plants, while a jug or larger con- tainer is suitable for small trees. This ethod takes much less time than is re- iired to pour water over the ground fre- iently, and also eliminates carrying and asting so much water. In many soils, en when dry, a milk bottle filled with ater at night will still contain some e next morning. When a pop bottle is ised it is not necessary to dig a hole; just ish it into the soil for a few inches.—W. Schaphorst, Newark, N. J. @ High-speed reamers will often work in etal so refractory or tough that carbon- teel reamers would fail utterly. Box Rest on Storeroom Ladder A box rest on a storeroom ladder is a handy attachment as it holds the box while material is taken out or while space ‘=e > Box REST a a Handy Box Support Attached to Storeroom Ladder roves Great Help to Workers is made for the box on the shelf. It con- sists of a length of 34-in. iron rod, bent as shown, and having the ends formed into eyes, which slide on two side rails, also of round iron, attached to the ladder as shown in the illustration. In use the rest is slipped up to the height -where it is needed, and the box is then set on it and on one of the rungs. The weight of the box binds the rest to the rails and keeps it from slipping down.—Harry Moore, Montreal, Canada. Making Blueprint Paper When it is impossible to obtain blue- print paper, it can easily be made by sensi- tizing ordinary paper with a solution made in the following way: Dissolve 334 oz. of ammonium citrate of iron in 18 oz. of water in a bottle; also dissolve 25¢ 9z. of red prussiate of potash in 18 oz. of water in another bottle. Equal parts of the two solutions mentioned above are then thor- oughly mixed and applied to the paper with a broad brush or a sponge, making long parallel strokes and spreading the solution thinly and evenly. This is done in a dark room under ruby light, and the sheets are then hung up to dry in the dark room, whereupon they are stored away for use, without exposing them to light. The mixture of the two solutions will not keep and should be thrown away after it has been used.

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1054 POPULAR MECHANICS Advertising Garden Hose The cutting bit is held in the cutter bar in the usual manner by means of a set In the spring and summer when gar-_ screw, and the bar is free to slide in the dens and lawns need watering to keep main casting. It was found necessary to them green and fresh, hose is often on make this casting of malleable iron, as cast iron would not stand up under the vibration. Hinged to the end the bar is a link, which may be oted at any point along its lengt on a stud fitted in a slot in the m casting; the link is also hinged the opposite end to a lead scre which operates in a square-groo wheel or spool. A spring-steel t or strap is wrapped around spool, one end being fastened the spool and the other to the lat bed. All slack is taken up by a ter sion spring attached to the end the cutter bar and to a support | Che device is mounted in the t post, the toolpost screw bea on the main casting of the atta ment. It is apparent that when lathe carriage 1s moved to the the anchored strap imparts a rot motion to the spool. This dr the leadscrew in, which, in tu forces the bar in, through the 1 tion of the link. For extreme t ‘Water Spray’’ Issuing from Garden Hose on Display in Win- dow Proves Good Advertising Attraction pers, the lead screw can be m with an increasing lead, o1 display in the hardware man’s window. multiple threads. This device has A striking imitation of water coming out been applied to the turret of screw of the hose will attract attention. This chines and to the spindle of a horizo1 effect can be had by stretching a number _ boring mill.—W. Bennett, Bloomfield, N of lengths of white cord from the end of the nozzle to a 2-ft. wire hoop, which is stapled to the side wall. The hoop must be perfectly circular and the lengths of cord tied on at equal intervals about 1 in -TAILSTOCK -LATHE FACEPLATE __ apart. The other ends of the cord are tied fe: _— together and fastened to the nozzle, i 7 MAIN CABTING which may be done by passing a small 1 LEAD piece of wire through the knot and insert- ines SCREW ing this in the recess at the end, then pat > screwing the nozzle up tight to hold the Ft “ wire. The hose is mounted on a reel which nm is pulled back to keep the cords taut. -R. + gre F. Lufkin, Medford, Mass {i A Taper-Turning Tool SUPPORT BAR for the Toolpost The writer was recently called in on a —- job where the problem was to turn a quan- tity of parts like that shown in the draw- PIN ---- ing, on a regular engine lathe, without setting the tailstock over or using a stand aX ard taper attachment. The taper-turning CLAMP COLLAR —_ tool shown was therefore designed and —————— worked in a very satisfactory manner. Attachment for Lathe Toolpost for Turning Ta

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ts to make them sed on any rad the metal

luces ] “frying” without any How long will dry cells last? A. parts a film of oil w rly harmful on r arbonizes as the rheostats get hot, noises in dio equipment now on the market is designed to form of

Is there any objection to oiling the shafts of rheo- turn easier? A. io equipment. In many radio de are used in making connections ill cause interference. Oil is par- the rheostats, since it heats up and thereafter the receivers. Practically Oil should never lubrication. The A-batteries ld give about 150 hours’ service. When a volt ter connected across the terminals of a 45-volt B ttery registers less than 35 volts, it is time to re e the battery with a new one. In the case of A teries a voltage of 3.5 necessitates replacement, the per working voltage of a new battery being 4.5. voltage of set in A-batteries should operation, always be A-battery tested with as an which is almost

which you are familiar in this country triode valve, since it contains three electrodes, filament, plate and grid. The diode valve, or two-electrode tube, was invented by Dr. J. A. Fleming before the discovery of the more efficient three electrode tube. His tube lacked the grid. For a while + they were used both as radio detectors and as rectifiers for alternating current The present diode tube is used as an amplifier only would be a B-BATT a ‘ian A

5-MFD. oe CONDEN Q. How can I eliminate bat- “ — tery noises which interfere Fig. 3 with clear reception? A. Con nect a .5-mfd. batteries, as in fixed condenser i across the A and B Fig. 3, and reception will be quieter Q. Is it all right to use acid flux for soldering radio down will show a higher voltage if it is lying connections? + -= use. If you use paste, use 4 volts. If you -&: - es a the minimum amount ne e no voltmeter, you y Z Se = i \ essary, and remove all sur- judge of the condi ~ = : a } E plus with alcohol. Other of the B-battery by Tend “ wise the molten paste ning to the click in i 2.s which runs down under loud speaker as the binding posts will cause is inserted in the very poor connections. l-speaker jack. When atteries are fresh, the k will be quite notice voltage disappear rely. Considerable due to the =e e, but as_the ps, it will ver is lost, stance of connections, unclean and care

bat

ild always be taken to Fig. 1 e that a useful battery not discarded when rty connections are all t prevent its deliver the proper power. The illustration (Fig. 1) shows mmon B-battery cut open A is the zine con ner of the individual cell; B, a moisture-proof wrap- around it; C, the se aling material; D, the parti between cells; E, the cardboard outer case; F, the seal, and G, the wobbiiner between the two seals. Can a B-battery be used until it is entirely ex- ae and if not, When the voltage of

how long is it proper to use one? your B-battery drops to 60 per cent of its original value, it is time to replace it. A weak battery offers increased resistance, reduces strength of signals and causes all sorts of battery noises. (See Fig. 2.) Q. How can I test my B-batteries? A. Never test a -hattery | shorting it with a screwdriver or other piece of metal to see if you get a good spark. This will soon ruin any battery. Always use a good high-resistance voltmeter for this purpose. An ammeter will not and never use a cheap, inaccurate pocket instrument. Q. Can you tell me whether a diode valve is the same thing as the ordinary American vacuum tube? A. All ibes are called valves in England,

but the tube with

Q. Is it necessary to dis- connect the A - battery when the receiver is not in use? If you have a potentiometer connected the A-battery, it otherwise a consider drain of current will through the po tentiometer winding. The simplest and most con- enient way of discon ecting the battery, is mounted on the panel cross

ecur ’ ufforded by a swit Q. How can I tell when a dry-cell A-battery and a B- battery are worn out? A. If the signals become weak, and turning up the rheostats does not increase the volume, it is pretty certain that either the A or B-bat tery is run dowr The B-battery should be tested with voltmeter to make sure, and the A-battery with an ammeter. Q. I am planning a set for a very shallow, compact box. Is it all right to mount the tubes horizontally above the other instruments? A. Never mount a tube horizontally, as the filament may eventually sag and rest upon the grid, making the tube useless Tubes should always stand in an upright position Q. Is it more economical to use large size B-batteries than it is to use the small ones? A. The current capa ity of the large batteries is so much greater that they should always be used when possible. Of course, in a portable set, where space is at a premium, the smaller batteries must be used. My receiver works satisfactorily in one room, but when I extend the aerial lead-in and move the receiver to another room, the signals are much weaker. Can you tell me the reason? A. Your trouble lies in the long lead-in running through the house when the receiver is moved. The walls and ceilings absorb much of the 1055

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1056 POPULAR close to the s brought in radio frequency energy. Place the receiver window through which the antenna Q. A 100-ft. but = good re- am using of braided wire on the and a lead-in os gp? é of about 30 ft., sol- 5 ae ct'¥o-° dered to the aerial about 50 ft. from each end. Can you suggest any change? A. The length of an aerial not the over-all length of } the wire, but the distance from the lead-in to the end. With your arrange- ment you have in effect a 9)-It two wire aerial, instead of a 100-ft single wire Take the lead-in tap off one your trouble will | antenna was specified for my set, doesn't sults. 100 ft. copper roof, 1s 100-ft. strand and ve (See Fig. 4.) your up. Is there any possibility of a storage battery accumu- Q.

MECHANICS have been killed while pulling antenna wires over power lines, and if the antenna is placed below them, there is always the danger that the power wire may fall on the aerial and ruin the receiving set or ir anyone operating it Q. How can I stop radiation from a single-circuit re ceiver? A. Add a single stage of radio-frequency plification in front of your single-circuit receiver this will cut out radiation from your antenna radio-frequency amplifier itself, however, should 1 be allowed to oscillate. Neutralize the first stag: the same manner as a neutrodyne, and thus be sure you are not disturbing your neighbor's reception Q. Can you tell me how to make an amplifying trar

former for audio-frequency amplification? A. Don’t ¢ to make one You would only give yourself a lot trouble, and end by produci an interior instrun It is best to buy one of the reliab'e machine-made tr formers to insure getting good results from your Q. Is it necessary to disconnect the battery from the set to charge it? A. Yes; never turn on the charger » the battery is connected to the receiver, or you blow out your tubes, or the line fuses Q. How can I get rid of body capacity? I have + hold my hand near the dials to keep distant stations tuned in. A. Connect the rotary plates of the vari to the ground, or if the variable 1 condenser conde!

lating so high a charge as to become dangerous? is in the secondary circuit, connect the rotary plate Strictly speaking a storage battery does not store the filament side of the circuit If the trouble is ex up electricity as suc! lf it did, the voltage would rise enced with the plate variometer, connect the to very high figures, just as when electricity accumu windings to the plate and the rotor windings lates on a condenser What happens in the storage B-hattery battery is that the charging current deposits a chemical , ; on one of the plates of the battery When you stop Q. Should the ground wire run straight down into t! the charging current and connect the wires to withdraw earth under the spot where the receiver is placed? I ha electricity, this chemical been told it can be fasten lissolves again in the bat 1|| OUTSIDE OF con to the radiator pipe. \ tery and produces electri sv —, _, GRID LK & radiator pipe may be 1 ity What is stored in the = ~ 1 COND but is not so satisfact ttery is really this chemi —— 1 the cold-water pipe ; cal, not electricity itself | SEC. & 1 23-PL 3 P| heating pipe goes onl : | ewe: the furnace, while the w Q. I am very much inter- 5 } main gives a ground u & a he . hel I ested in the details of the == the entire city t is - PRIS _ : ro oe rebuilt Reinartz cet de- re ® = A j necessary to ground scribed in your March issue. ae — 7 hhh ceiver beneath the set Please publish the hookup : ' the length of grour 1 of this receiver. A This is 23 PL < should be —— in t et the ordinary Reinartz hook =o | J tal length of the aerial up, and a schematic diagram = a c * other words if . 2 (Fig. 5) is given herewith —S_o B ground connection is u TICKLER X41} jul the aerial should be s Q. Why does a nail driven into a live tree make a good 22 ov 45V ened accordingly. ground, while one in a dead 1-STEP REINARTZ HOOKUP Fig. 5 Q. Can a hard tube be use tree does not work? A. The as a first detector in the live tree contains sap which is not pure water, but con- Popular Mechanics superheterodyne? A. We re taims various salts in solution The sap is a very good mend only the soft tube for the first detector a electrical conductor The dead tree has no sap, and hard tube for the second If the set is built of hence makes a very poor conducto parts specified and according to the drawings givet know it will work satisfactorily We cannot guar Q. How can I build a transformer for use on direct the same results if different parts are used current? A. This cannot be done The principle of

the transformer applies only to alternating current, or such pulsating ¢ ents as you have in a radio receiver With alternating current, each time the current direc tion changes a magnetic wave is produced around the primary <« il and this wave creates the pulse ot current in the secondary coil. With direct current there would be no such alternating magnetic wave, and accordingly no current pr mduced in the secondary While radio currents are direct, vet the e ire successive impulses which give the same effect as an alternating current an hence tT! ike transtormers in radi ’ Pp yssible Q. I want to erect an aerial from my house to an ad- joining one, but there is an electric-light power line running through the yard and the antenna would have to pass over it. Will the power wires interfere with the working of my set? A. Do not under electric-power erect an ar wires tenna either Several persons over oT Q. Is radio-frequency amplification employing res

ance coupling satisfactory. A. It is feasible wave-length work, but ts not so efficient on the shorter wave bands more generally used in broadcast ng. The large internal capacity of l cuur n tubes causes this Q. Is it all right to shellac the windings of a coil to keep the wires from slipping? A. Never use shel lac or paint on any radio instru ment A small bit of sealing wax dropped on the edge of the wind ing of a coil is sufficient to hold the wires from slipping The end of the wire sl be passed through three small heles drilled im the « (See Fig. 6.)

I N accordance with the editorial policy of this magazine never to accept compensation in any form for what appears in our reading pages, and also to avoid all appearance of doing so, we are obliged to omit the name of the maker or the seller of any article described. This information, however, is kept on file and will be furnished free, by addressing Bureau of Information, Popular Mechanics Maga- j zine, Chicago. [ Editor. ] al

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POPULAR MECHANICS ADVERTISING SECTION a

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~~ he > lean FE ctnwrties ED, Double and triple your present earnings —stopping this waste The loss to railroads and manufacturers, due to the improper cratingof merchandise, runs into the millions of dollars. Practically every. dollar of that loss is preventable. The trained Traffic Manager knows what to do to eliminate that loss. Every day his specialized training proves its worthindollars-and-cents sav- ings to the company that employs him—proves his right to a handsome salary. Take the matter of scientific packing. A well- known concern manufacturing Kitchen Cabinets— acting on the recommendation of its Traffic Manager—worked out a plan for detaching the legs of the Cabinet and shipping the entire outfit in cor- rugated papercartons. Inasingleyearthe total saving resulting from this change amounted to $136,000. How is that for an opportunity to show results? Again—take the matter of classification, weigh- ing and routing. In 1923, the saving effected by the Traffic Department of the Woolworth Company —thru the application of a scientific understanding of Traffic Management—amounted to more than $200,000. Do you wonder that the man who heads that department commands a big five-figure salary? How do men prove their title to such salaries? — By saving big money for the firms they work for. Traffic Management— A Field of Unlimited Opportunities Traffic Management is a new and rapidly grow- ing profession in which men who make good com- mand incomes ranging from $50 to $200 a week, and even better. Ten thousand a year for an experi- enced and capable Traffic Manager is nof large. At least three of the leading automobile manufac- turers pay their Traffic Managers twice that figure. “Big men,”’ says J. Ogden Armour, “‘are sim- ply small men who have had a chance to grow.”’ Gwe yourself that chance! Can you make savings for your firm or in your POPULAR MECHANICS ADVERTISING SECTION s oe r ~ & } } —~, \ bid ge * field which would justify doubling your saiary? Car you do what thousands of others are doing every day of their lives? Only 2c and two minutes stand between you and the answer to those important questions. Simply indicate on the coupon the field in whi you desire success and we will send you with cost a book describing the LaSalle salary-doubling plan and the opportunities in that field. Can you afford to turn the page without making this slight effort to insur. your business future’ am ae ae NOUR COVUlrwe eo = LASALLE EXTENSION UNIVERSITY The World’s Largest Business Training Institution Dept. 664-TR Chicago, Illinois Please send outline of your salary-doubling »lan, together with a copy of “Traffic oakeumant.” also copy of “Ten Years’ Promotion in One,’‘all without obligation. Traffic Management — How Traffic Men Make Money Other LaSalle Opportunities The LaSalle plan opens the way to success in every important field of business. Check below the opportunity that appeals to you. O Busi M t O Modern Salesmanship O Higher Accountancy D Railway Station Management D Law — Degree of LL.B. O Banking and Finance O Modern Foremanship and Production Methods 0 Personne! and Employ- ment Management 0 Expert Bookkeeping = a O Business English Efficienc 0 Commercial Spanish O Modern Business Corre- O Effective Speaking spondence and Practice 0 C.P. A. Coaching EE ee ae Ce Address ................

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POPULAR MECHANICS ADVERTISING SECTION . CARPENTERS LET THIS NEW AUDEL SET SOLVE YOUR PROBLEMS NOW your job and you'll never be without oe ] > cere “i Condensed Contents of one. The man who takes pride in his per- Audel’s New Guides sonal skill is the man that is always in - . Guide No. 1—431 Pages demand. The skilled carpenter’s work is the 1200 ILLUSTRATIONS easiest because he knows the practical short cuts Use of tools, different woods, nails and screws, filing saws, chalk line, and modern methods. His pay is higher be- plumb and level, rules ‘and scales, - " mitre boxes, steel square, laying- cause he does more and better work with less out work, joints and joinery, how to build work bench and furniture. effort. Audel’s Carpenters’ & Builders’ Guides 5 gives you a Helping Hand into the Master Oulte So. ee gs } Class. AcompleteCarpenter’s and Builder’s Carpenters’ Arithmetic, how to . yuil ,ouses, barns, gé ~s, | - Course for study and ready reference. Sn, manding pak aavolen Up specifications, estimating cost, pro- Helping Hand Is Extended to You portioning beams, estimating strength of timbers, mensuration, Carpenters everywhere are using AUDEL’S geometry, trigonometry CARPENTERS’ & BUILDERS’ GUIDES as Guide No. 3 — 255 Pages a helping hand to easier work, better work and 400 ILLUSTRATIONS y better pay. To get this assistance for yourself Exeavating foundations, how to all alien eee Sees a below witl aaaine aateas cmd. ota, Women S. you need only use the coupon below without esttine gi ‘ders a sills, framing , risk. Find out for yourself whether they will joists, well boles, how to »lath, types iwh off “ . of roofs, t sk vlighte ‘and ails be a valuable daily assistant in your work. scaffolding and hoisting. If you find that the hundreds of charts, tables, lout diz bee 8, specificati : ; and rr —— = will Guide No. 4 — 448 Pages lagrams, Specifications and insiwucuons wi 400 ILLUSTRATIONS help you, keep the books, sending $1 a month for 6 months. | . Shingling, how to lay roofs, hang aKING doors, frame windows building Strong, flexible covers easy to carry in the pocket. Clear whites stairs; cornice work, exterior and in- paper. A handsome set of practical, helpful books that every carpen- terior trim, laying floors, putting on —-—_—— ter will be proud to own siding, painting, and first aid to the injured, HANDY POCKET SIZE GUIDES | Use This Free Coupon Now! BIG TYPE-EASY TO READ AND LEARN 1500 PAGES-3700 EXAMPLES Take this step now into the Skilled Carpenter Class. Don’t keep on doing hard or unnecessary work that you don’t have to do. Learn the short cuts and easier modern methods. Be a Master Worker. Let these Practical Guides give you a helping hand into the class where you belong. Auptts ELS Auoecs a woenTes CARPETS Caren TES - THEO. AUDEL & CO. aytNead ms Pebibce «= 72 Fifth Avenue, New York City VILDERS ” Ques y EXAMINATION Please submit me i approval d free wow examination: AUDEL’ $ CARPENTERS’ 3 mw ety Ano BUILDERS’ GUIDES. Ship at once, prepaid, the 4 numbers Sir isfa a tory I agree to send you $1 within five days and ) fure 2 ther mail you $1 monthly until $6 is paid © BD ivam > a Add * Ads BS Bo Occupatt m a Employed by.... 6T 30

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POPULAR MECHANICS ADVERTISING SECTION Bea B. W. Cooke " Job-way" Trained: =a ant 3000: $10000.2 year The World's Greatest, Most Fascinating Business NEEDS YOU! Why, man, look into this Auto Business — it n s you! Send Coupon for my Big Free Auto Book right now! Think of it—Five Billion Dollars spent every year for AUTO UPKEEP ALONE! No matter where you live, this aetr field offers cnimated opportunities — EV RY- WHERE —for Cooke Trained Experts. Find out how you too can start to AN rE Make $60 to$200 a Weekk 2 2 osc a penny less! Hundreds of Big Pay Positions open right now, waiting for Cooke “‘Job-Way” Auto bh xperts —opportunities waiting for you. Just read my book “Job-Way’ See how many BIG PAY opportunities there are and “T make money quick like Morriston, Car- chances to start your own usiness—where $3,000 to arth ter, Mayville and other students! $12,000 a year and more can easily be made. Y _— ° if vi Clip Coupon You Don’t Need to Leave Home! BBY. ow Stay Home! Keep Your Job. Save Hundreds of Dollars. Students’ your letters in my Big Free Book —c that you needn’t leave your away doorstep! Read them. See w “JOB-WAY” is so thorough, so Tak practical and such easily learne d Auto Training. Being a practical = OUTFITS i PP ESUIPMENT F ane tO Dire cting Engineer, owner and head of this es I know Spor Offer—Act Quick! Many students what practical, money-making training ite need to be a BIG want use these outfits to make money PAY Auto Expert—and THAT TRAINING I give you. . FREE shortly after starting my training. ever MAIL COUPON NOW! Experience or Education No Other Training Jike do w Not Needed! | don't care how “JOB-WAY'"’! Bb. W. ° be little schooling you have. Men of isinnoway connected withany r ys all ages can become Garage Owners person or training of sirailar 1 “Ty and Managers, Superintendents, You get the original, genuine, copy: Foremen, Auto Experts, in the class Cooke “JOB8-WAY" training. Incl days | with BIG fe Ty as Mechanical, all Electrical work ~ It } completing Cooke “JOB-WAY"™ Starting, Lighting, Welding, Brazing lad B. w. COOKE, Directing E _— training. I guarantee Under Bond, many othe er big features—everything ¢ hb a Chicago Auto ‘Sho Ss, Dept. that I will prepare you to take ad- yous HIGH SALARIED Auto Bape. he g 1916 Sunnyside Ave., ICAGO, ILL. vantage of the many wonderful Op- BOOK! Find out how thie. trai in t Send me FREE Auto Book and proof that I can Oo = you for BIG FAY. Gee wit ie eee WOW. thing become an Auto Expert at home in spare time. ff Also send your special offers of 3 FREE outfits Address me B. Ww Cooke ?.; en ee -— . personally ° H eee Te eer re ee ret Name ago t CHICAGO AUTO SHOPS : ceecccccces Address es Ow: The Famous “Job-Way” Training Institution he et eeeeeeeeeeeees Town -++++ State 1916 Sunnyside Ave. Dept.A16@ CHICAGO, ILL. a

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EE that man at the Receiving Teller’s window? That’s Billy King, Sales Manager for the Browning Company, First of every month he comes in and deposits $500. I’ve been watching Billy for a long time—take almost as much interest in him as I do in my own boy. “Three years ago he started in at Browning’s as a clerk at $15 a week. Married, had one child, couldn't save a cent. One day he came in here desperate—wanted to borrow a hundred dollars— wife was sick, “I said, ‘Billy, ’'m going to give you something worth more than a loan—some good advice—and if you'll follow it V’ll let you have the hundred, too. You don’t want to be a $15 clerk all + ~ur life, do you?” Of course he didn’t. ‘Well,’ I said, ‘there’s a way to climb out of your job to something better. Take up a course with the International Corre- spondence Schools in the work you like best and want to advance in, and put in some of your lings getting special training. The Schools will right here in the bank.’ “That night Billy wrote to Scranton and a few days later he had started a course in Salesmanship. It had a fascination for him and in a little while he got his chance on the city sales force. Why, in three months he had doubled his salary! Next thing | knew he was put in charge of a branch office up state. “He made such a good record up there that a few months a brought him back and made him Sales Manager— on sa'ary and commission. He’s making real money now. Owns his own home, has bought some good securities, and regular at that window every month. It shows what can do in a little spare time.” ma POPULAR MECHANICS ADVERTISING SECTION j “He Deposits $500 a Month!” Employers are begging for men with ambition, men who really want to get ahead in the world and are willing to prove it by training themselves to do some one thing well. Prove that yow are that kind of a man! The International Correspondence Schools are y and anxious to help you prepare for the position you want in the work you like best. _ Surely the least you can do is to find out just what there is in this proposition for you. Here is all we ask: Without cost, without obligating yourself in any way, simply mark and mail this coupon for complete information, INTERNATIONAL CORRESPONDENCE SCHOOLS , Seranton, Penna. Box 5513-E Without cost or obligation, please tell me how I can qualify for the position or in the subject before which I have marked an X BUSINESS TRAINING COURSES (Business Management { } Industrial Management { lathe Me Organization () Traffic Management (|) Business Law | ) Banking and Banking Law |} Accountancy (including C.P.A.) [) Nicholson Cost Accounting (] Bookkeeping LJ Private Secreta Spanish oO French LJ TECHNICAL AND IND [} Electrical Engineering ] Electric Lighting ) Mechanical Engineer }] Mechanical Draftsman ) Machine Shop Practice ) Railroad Positions }Gas Engine Operating )Civil Engineer _) Surveying and Mapping F) Metallurxy LjSteam Engineering Lj Radio Name Street Address Occupation ) Salesmanship ) Advertising ) Better Letters }Show Card Lettering } Stenography and Typing } Business English } Civil Service Railway Mail Clerk [| |}Common School Subjects { } High School Subjects (J) Illustrating CJ Cartooning USTRIAL COURSES [) Architect } Architects’ Blueprints ]Contractor and Builder ) Architectural Draftsman }Concrete Builder ) Structural Engineer }Chemistry () Pharmacy } Automobile Work } Airplane Engines }) Navigation } Agriculture and Poultry Mathematics 3-6-24 State Persons residing in Canada should send this coupon to the Interne- tional Correspondence Schools Canadien, Limited, Montreal, Canade.

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10 A RAILWAY BErrarric INSPECTOR PER MONTH EARN UP TO *250 Expenses Paid POSITION EASY TO GET More Trained Men WANTED Good Positions Open This wonderful new profession presents unusual opportunities for pleasant work and advancement. One great advantage START AT is that, after preparing in about three $1 1 Om months’ spare time at home, there is a position waiting «I you upon graduation. Enjoyable Work Railway Traffic Inspection takes you out of doors and pre- sents many opportunities for travel if desired. Work is steady, hours are not long; you report to high railway officials. Ex- ceptional opportunities for advancement. A SPLENDID FUTURE R. H. Kruger expresses his gratitude in this way: “ Having completed your course in Traffic Inspection, I find that it is very interesting work; also it is one of the most interesting studies of today. The work is very fascinating, and I would be glad to advise anyone wishing to take up this course, as it is sure wonderful work, a splendid future. Your Diploma means Prosperity.” with You can easily qualify in your spare time at home easy to understand. about a position. Everything Upon graduation you don’t have to worry Cost is moderate; easy terms if desired. SEND COUPON TODAY Get complete information. Hundreds of successful gradu- Send coupon for free Booklet No. D-63 and terms of our strict Money-Back Guarantee, ates Standard Business Training Institute BUFFALO, N. Y. an Gene Gee eae ey ae Gee eee oe. o oe one aes GE i Standard Business Training Institute ] | Buffalo, N. Y. , Send me, entirely free, Booklet No. D-63, giving full | particulars about course in Railway Traffic Inspection. I | | I | | ne ee | I a | fn I Is eeniditecahahdiencttianaiumiatelneniieoniiattindsaieaamminsinaaan I Lace cum cm ap aun om om sm gunn am ahem anew an en ewe POPULAR MECHANICS —— SECTION TENOR BAN ERDF “e8 YOU CAN PLAY IT IN 30 MINUTES 40,000 successful students back up our guarantee that you cap Riay a piece in 30 minutes by following. our printed instructions, ou get this $18.00 TENOR BANSC, EE, as soon as you en roll for 52 easy lessons. New low +k. and easy terms! PICTURE LESSONS MAKE IT EASY You can’t fail to learn because the pictures explain every You-don’t have to be able to read notes. structions, move. Better than oral in- We teach you in the largest conservatory, by mail, PLAY FOR FUN OR MONEY Don’t be a walifiower. Get in on parties. Entertain your friends, Be popular. Play for dances, ete. Form an orchestra. Our 2 lesson course wil! make you an expert. Earn money in spare time, WRITE FOR SPECIAL FREE OFFER Famous teachers will explain how we can positively teach you to lay You get the free $18.00 Tenor Banjo with the first lesson, ay while you play. Write for other special courses under famous teachers for Hawaiian Guitar, Violin, Banjo Ukelele, Ukelele, FIRST HAWAIIAN © ~eenpenntenedel OF MUSIC, Ino, Weotwerth Bidg., Dept. 6O New York, N. ¥, “a Ma Do You Want a College Education We start you where you can EARN $500 a year after school hours, Endorsed by every Governor of the States, the Great Men of the Nation Educators and Teachers. Be the first in your town tomake big profits and sell The Book of Our Presidents from Washington to Coolidge. The only book of its kind. Every good citizen, student and scholar = buy one. Mr. H. T. Wang says **Here is the money for 1000 copies; now I can “nish my course "* Single copies f0c in civil engineering. Write Today. Agents Wanted. P, JAENICKEN CO..727 So. Dearborn Chicago LEARN TO PITC Lessons by “MATTY,” WALSH, WHI JOHNSON, RUCKER, WOOD — PIT@ THE FADE-A-WAY, SPITTER, KNUC LER, SMOKE BALL, etc., clearly descr! and illustrated by 56 Pictures Ent COURSE OF LESSONS sent p. p. for J.C. DORN, 721 S. Dearborn St., Dept. 65, Chicage LEARN MECHANICAL DENTISTR Earn $35 to $125 a week. Taught by actual practic a j night. ree months’ course. 3 laboratories. required. a blished 30 years. For 36-page catalog, write Dept. "2. BODEE DENTAL INSTITUTE NEW Y Ay me BUFFALO bi 136 W. Ly Se. . Broad St. 501 Washington St. ss LEARN PHOTOGRAPHY arn $200 to $500 monthly. Or start your own business raphy and Photo-Engraving taught by largest college ts Kind world. Established 1893. Big demand for graduates. Writ e fort Illinois College of 00 Box 465, Effingham, It Kinds of IRON, WOOD WIRE PUZZLES. | «aces Illustrated List 10 cent 200 Puzzle Works, C, St. Paul, Mi elivered to You Free 3—* De 30 days trial on approval. You can have your choice of 44 Styles, colors and sizes of the famous RANGER Bicycies. Express prepaid. jory-to- Rider Prices save you b to os on qour sepa win $5 aM save the p— 4-- Parents often advance first p: Tires = pry 2 at fac ayment. wheels aged pec tow — Mead DEPT Fr. yf

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POPULAR MECHANICS ADVERTISING SECTION We Will Make YouAn lectrical Expert ~! In12 Weeks At Coyne | you can itructions, a) a —_ tructions aes bce; mam S Not by Correspondence—All PRACTICAL Work * SO. wae I) IN GREAT SHOPS! m Oral ine ¥ ” by mal Clip that Coupon Right Now! Get my Big New Book—IT’S FREE! It points the way to Success for you. Crammed full of hard, dependable, proven Facts. Shows the way to Big ur friends, a. Our 2 —“ — Pay in the Largest, Most Interesting Money-Making Field ach seal ELECTRICITY! Find out how a world of Opportunities can be opened vat (nal wp for you as a Coyne-Trained Electrical Expert. See what my PRACTI- ler famous e, Ukelele, : d. : tN | SIC, Ine, = @6 SIC, Ing | | iy Earn $60 to $200 a Week! « ~ r y Yes, sir, I train you for the BIG JOBS in ELECTRICITY! Coyne IS NOT A CORRESPONDENCE SCHOOL! I train you- thoroughly on Students Doing Actual Wort Ow Thousands of Dollars’ worth of Electrical Apparatus. You do ACTUAL Power Transmission Appar. WORK on REAL EQUIPMI + the kind you use out on the job tbe why my Coe AKE GOOD. That's why you can master tlectricity in 3 MONTHS! ts ehh ava as Coyne Trains You for Life Radio and Auto Course Free Jp ates no dificrence bow much or how little Special Offer right now! I am in- uca or jectrica Xperience you have elu tir Absolute: F my Bi N » Cyne LEARR HY “DOING WIBEHODS! | RADIO COURSE and AUTO. AL TRAINING has done for others. Read what they say about Coyne. ve done it for thousands. I will do it for TRUCK andTRACTOR ELECTRIC- ’ ~~ You ! At Coyne you get a Life Scho larship. ITY. Coupon brings full details. - ’ ae 3 You can stay_longer than the Ca ey time if necessary. You con retorn any time later to EARN Whiie You LEARN take up new work m continually ~~ to

keep my course up-to-date at all times. I back my students up. My Employ- T HERE'S THE BOOK! ment Dept. will assist you in getting j C : FREE! Send for it now. It’s = book worth a@ part time job to make a good part 3H, WHIT * - having. Handsomely bound. Beautifully li- of your expenses while training. And »D PITe lustrated. Size 12x15 inches, Shows dozens it will help you get a BIG ty _photesteee a, pS rr", ptadents PAY JOB on graduation ¢ ’ :

* o s' experiences. hows what | Students Working on Massive Sg F D A. é Control ane. botits sy yours FREE if yo »u — R E E ee <a aaa Railroad Fare! = on the ait. : Come to Chicago—the it = WTAY, 260 Electrical Center of the - World. I'll pay your Pe Fn : Railroad Fare from any place in the United States. Grasp this op- portunity to fit your- self for a BIG al! JOB. Send coup quick for full a ticulars. meters,

arent Students Practicing House-wiring ain “eal it. tee In Skeleton Houses po-- st ------ 10 cent mt & = Send For Free Book 1 MAL L THIS COUPON! Cc. LEWIS, Presid COYNE ELECTRICAL SCHOOL, 1300-10 West Harrison St., Dept. 135-A, CHICAGO, ILLINOIS Dear Sir: Please send me, absolutely FREE, your big Ne w Book and full particulars of your Special Offer of Two Extra Courses and FREE RAILROAD FARI

race” COYNE omni. ELECTRICAL SCHOOL 00-10 W. Harrison St., Dept. 135-A, Chicago, Ill. Name etna

Address

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POPULAR MECHANICS ADVERTISING SECTION (P. & A. Thoto WORLD FLYERS Greeted by huge crowds landed at Paris after flying 17 when the y ,000 miles Excitement-Popularity Thnills-For Young Men in AVIATION the excitement and To daring young men who love adventure, field of Aviation offers fascination, thrills found in no other work. As yet this industry is still in its infancy and the chances ‘ the student gets a thorough unders ~~ One ¢ res of reading them.’ James Powers, Pa other stud “T am indeed surprised that such a v aluable course ¢ 4 from such practic al men for so little cost Personal Instruction By for quick success for trained men of courage, nerve and self-reliance to fill the jobs which are unlimited will lead quickly to advancement, big pay and success in this thrilling work. Unlimited Opportunities for the Trained Man S100 to Aeroplane Prepare for These Positions Aeronautical Instructor $60 to $150 per week Aeronautical Engineer Aeronautical Enormous Profits Experienced Men Men who ha had actual expe Aviation give personal atte and guide you carefully through y t 4 Thev select the lessons, lectures, | ts and bulletins They tell you the $300 per week are essential to your success Contractor mig Aviation Book yas Repairman The Airplane Industrv is the ONE un- apatiens thai id coupon below for new FRI J crowded field It is only 21 years since the $40 to $60 per week out, ' ‘Opportunities in the Air pla ei Wright Brothers made the world’s first air- Aeroplane Inspector It is interesting and instructive and : plane flight Now airplanes fiy around the $50 to $70 per week you many things about Avi won © world Today Aviation offers the same aston- Aeroplane Assembler never knew het ishing opportunities as were found in the auto $40 to $65 per week a limited: mobile and motion picture industries 15 and Aaor to 8 to tani ae yous & 7 20 years ago Men wl rot in on the ground edition ts exhau floor when those industries were young made AMERICAK SCHOOL millions before others awoke the opportu nities they held AN I \’ rie IS NEW! It clamors for OF AVIATION trained men—big pay awaits the capable man! Easy to Become an Aviation Expert—$50 to $150 a Week You can now qualify quiekly for one of these exciting, big pay jobs through a new, sure, easy method of training. The study of Aviation is almost as interesting as the work itself Every lesson is fascinating and packed full of interest. That's why Aviation is so easy to learn. Only one hour of spare time a day will give you the basic training in an amazingly short time One student, 8S. F. McNaughton, Chicago, says: “Your lessons are like a romance and, what is more, after one reading 3601 Michigan Ave., Dept. 135-A_ Chicago, Mt. At SOME © AVIATION eerie | AMERICAN SCHOOL OF AVIATION, ! 3601 Michigan Ave., Dept. 135-A, Chicago, Hlino's | | Without any obligation, send me your Free Boo | tunities in the Airplane Industry also informatk | your Course in Practical Aeronautics ] Name | | Street | City State wil hese fou have guestions noney an raining now wha our who pends on ou choo BWER TH traight fr plain Ens million hool gua Her bond his sensa 2 Wiring Outtit

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POPULAR MECHANICS ADVERTISING SECTION 13 Iwill answer nese questions: lad ) RIV.) T) Sati’ OQuarantee me

ey and time into home- vou are! entitled to it will do for you. our whole future success de- nends on the kind of training ou choose NOW. 1 WILL AN- REWER THESE QUESTIONS— craight from the shoulder, in siain English. For the first time million dollar correspondence pool guarantees its training un- ter bond. Coupon below rings his sensational guarantee.

Chool $2.00 a week a 7 ) torElectrical miles Graduates, EXPERTS! rill help you at every step—- Enormous demand for all-around Electrical Experts as tat age 4 pony ty Power Plant Superintendents, Chief Electricians, ve-time Work; hep you finda Foremen of Construction, Electrical Draftsmen, Radio 4 I 11 position when you Engineers, etc. And with my training you te d help you make good can go into business for : ; ourself with vance to a betterone. _ little capital and make \merican School back of to $12000 a vear bound to succeed big : F Electrical business. G I GIVE YOU THESE __eAElectrical : Outfits! }

This is not a one-man, one idea school. 22 famous En- gineers and Executives of the following anqpenations and universities helped me of a Million make Dunlap-training com- plete and up-to-date: Opportunities! | ener rice. co. ave to leave your Com mon wealth'Edison Co. e or quit your job, you don’t While you're at it, while you're spending your Crocker-Wheeler | By y D ast LZeoceery time and money to be a success, Train for heehee ype Mm — | ~ — 1 - + an ; ee —_ : pay Boss jobs in the World's fastest growing industry. Telegraph . Electrical Outfits, ai The world’s work is now being done by Electric power. Westinghouse Electric : tory and Shop appa- Autos, ships, buildings, aeroplanes, all electric equipped _& Mfg. Co. and tus i need to understand Electric lights everywhere. Think of Radio, Telephones, Western Electric Co. ning r ve ond pri Telegraph, Electric railways. This business DOUBLED in . ~ . Dept. EA-74, Drexel Ave. Mail Coupon-Gel my Answer’ ON seat YQ SF _ and 58th St., CHICAGO 7 \ : ’ _ Chief Engineer Dunlap, se OM es &. Radic Receiving ° 11 — = Set AMERICAN SCHOOL, Dept. EA-74 1 ptm Y « ] [2] Drexel Ave. and S8th St.. Chicago

A i the

Send me at once complete information about becoming an Electrical Expert, also your new guarantee and your confidential SURPRISE offer

| | | ' Name h | y | © | 9 st. No | © iS... {vo J ourin’ : oe

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14 POPULAR MECHANICS Two Incomes GoodSalary; Paying Home Work Read this letter from a successful Dobe student “As a beginner I am doing fine. Am earning a salary of $300 a month, besides I made over $450 at home the last two months. The practical drafting training you gave me oy, mail put me where I am in less than six months study. hank you for all saat personal interest and help.”’ (Signed) J. Name and Address upon request.) ! Guarantee: To train you on practical work under ees supervision until competent as a regular draftsman, and guarantee fur- —_ to furnish you with draftsman’s ete working outfit, a special oCh ef’s Own” drafting and os om r instruments you need, just as you become my student — all to >be x aun. in the course without extra You ey Ss 90 Drafting Earn a Course In addition to my other offers, I have made arrangements whereby you may earn a regular $90 drafting course while ze, are my student. I want to offer ovary es to am- itious men anxious to s ina big way. Big pannes issue calls every day for ¥ obitied Ui. to fill Sood | Seyi tions, trained man can be ly sure of a all the time. Write fc for de details, Drawing Table AMMCluded! Drawing Table Here is the drafting outfit and drawing table which I send ou without any extra charge whatever, the minute you »come my student. You get every tool you oe The retail price for these articles is approximately $23 Read again the letter above. What other >on al have done, you can do. Write tome. Make your start now. — Write for FREE Book Send Coupon Today Get this t book—‘‘Successful Draftmanship.’’ Send cou- pon for free book today. Chief Draftsman Dobe 1951 Lawrence Avenue, Div. A-135 Chicago, Ill. CHIEF DRAFTSMAN DOBE 1951 Lawrence Ave., Div. A-135 Chicago, Ill. Without any obligation to me please mail your book, *‘Successful Draftamanship,’’ and full particulars of your liberal ‘‘Personal Instruction” offer to a few students PID ciimncnidpeccsvcanavencenmmensesnsnonsntesencsnendesaseesion nienthntinititipiteamannnendimnnamneness ones — PU ii cntesntsnerentsensecatenseenssecasecs 0n00...cccseces euce ADVERTISING SECTION HE | o I I Teach by Mail Oh, | I can make & good penman of you at your . home during spare time. bo matter w)} ere s youlive or how poorly you bow write. My w! simplified system bas shown thousa ade 1 ; the way to good penmanship durin ig the uh ast twenty-five years— it CAN and che , ILL do the same ror OU. f. My be autifull h S As illustrated 32- page Book “ How to Become Ye 3 a Good Penman” D 4 (7 Z, ( SA w= Bove toe tee) FREE! : It contains many beautiful specin ens of bla ) penmanship showing what others hove ac- complished by the Tamblyn System, wit! going testimonials and ceneral information about our courses. (Your name elegantly written on a ard you enclose siamp Jor postage I nies! successfully as men. Write Today. Pe ae 33 A Ph Ff. W. TAMBLYN 418 Ridge Bidg. Kansas City, Mo., U.S. A. 1 It's ) Sav pier ‘ e ___—_—__———————— r My job lam g == IN Yourm C own BS" : ; : starter Yow can Tae. Uke thu quidly HOME m Piano, Organ, Violin, Mandolin, Guitar, Banjo,et.m Beginners or advanced players. One lesson weekly. Illustrations make everyt ba KUO jain. Only expense about 2c per day to cover cost of tage and musik cat rite for FREE booklet which explains everything in ful on you AMERICAN SCHOOL OF MUSIC, 5 1 Lakeside Building, CHICAg¢ strong have a your € you ; recogni It you stammer attend no Institu Ul yuu get my large rong, 'STAMMEKING, Its Origin and TI 1v¢ Advanced Na at of. Vi ment.’’ Ask for specia i taleen Miikend 6% EE cna ot Th N et Magazine,’’ pu lished monthly in the interest of those afihct D- manho mering, stuttering and other speech impediments. Lar gest ~ 7 and most —— school in the world for the cure of stam pity ar 20 years. Nos -song or time-beat. Write today. MILLARD INSTITUTE ¢ OF rl low Ss, SPEECH, 2317 Millard Bldg. MILWAUKEE, WIS. Branch Summer School, S« g uaran go. | With our TUNE-A-PHONE, Action Model, tools, charts and lessons you can learn quickly and easily and be prepared to make big money. Estb., 1898. Money-back Guarantee Diploma given. AZ in our free book, “ Winning ‘Inde pendence.” W rite for jay, Mies Bryant School of Piano Tuning. 40 Bryant Bidg., Augusta, Mich. | jan Finest bicye er built—44 Styles, colors and if sizes. Factory-to-Kider prices. FREE delivery, ex-ff AN press prepaid on 30 Days Free Trial. Cash or easy payments. Bicycles, $21.50 and up. ‘ lamps, wheels and equipment at half It con usual pricos.Send no money- Write today \. tome of for big catalog, specia: factory prices, free trial [HW] TE cies pion and marvelous offers. ap Write today for free nly CYCLE COMPANY Ranger Catalog, them be tory prices and mervr lous p.- payment te Came t —e — ther I phy ur Don to 4 tot cost corn -an learn by our modern an . pli of instruction eve ee: a a } aged at home as good « ett ot put | rn money while well gt m or acon in pleting our vurse of instruct d repairers are always in demand $50 to $75 per week For part Wisconsin School of Watch Repairing 166 Mason St., MILWAUKEE, W'S

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POPULAR MECHANICS ADVERTISING SECTION 15 How Do You Look : Bathing Suit? THE good old swimming days are here. | boy! But it’s great to rip off the old s} to your suit and—SPLASH!! But * hock to some of the poor girls when ¢] e their heroes come out with flat cl nd skinny arms instead of the big, husky frames they expected to see. You Are Out Of Luck D try to make excuses. You are just k. It’s your own fault. You can’t I snyone but yourself. What are you to do? She is going to find you out, A Physique To Be Proud Of It's not too late. Snap into it and I can save you yet. It means hard work and ple f it, but—wait till you see the results. The Muscle Builder My job is to build muscle. That is why they call me The Muscle Builder. In just 30 days lam going to add one full inch to your bi- ceps. Yes, and two inches on your chest in the same length of time. But that’s only a start I am going to broaden out those shoulders and shoot a quiver up your old ba me. | am going to put a man’s neck on | and a pair of legs to balance the strong sturdy body they support. You will have a spring to your step and a flash to your eye, radiating the dynamic life within yol 3efore summer is past you will never recognize your former self. You will have a strong, sturdy, virile body to be really proud f f. You will be admired for your perfect manhood—while others are given glances of EARLE E. LIEDERMAN pity and scorn. This is no idle prattle, fel- 4 lows. I don't just promise these things. I Author of‘‘Secrets of Strength,”’ ‘‘Muscle Building,” guarantee them. Are you with me? Let's ‘Science of Wrestling,” ‘‘Here’s Health,” etc. g lime is short and we have a job to do, Send Forlty New Y OF kk AL A 2 Page Boo [JTT V7 i a ee 9 A. ntains forty-five full page photographs of my “y he many prize-winning pupils I have trained. = “ are le iders in their business professions today med ly given them a body of which to be proud, bi mn tter doctors, lawyers, merchants, etc. Some ~ ¥ me as pitiful weaklings, imploring me S ook them over now and you will marvel at thei ee - : = book will prove an impetus and a rea = % u t will thrill you through and through. ‘ . . you one penny. I want you to have it wr a mpli ments. It is yours to keep. This will not oblig all, b at for the sake of your future happiness and putitoff. Send today—right now before you turn t: EARLE E. LIEDERMA. Dept. 2006 305 Broadway New York

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16 POPULAR MECHANICS ADVERTISING SECTION This Dental Laboratory Expert earns 20 a day! What’s the use of training for the old, overcrowded trades? If you’re going to prepare for big-salaried jobg or a profitable business of your own GET INT@ THE NEWEST PROFESSION — “Laboraton Dentistry.”” Biggest opportunity for suecess ¢ the century, because there are ten times as mang jobs as men to fill them, because there are a dozey cities crying for Laboratories for each EXPERT capable of operating one! if you want a job while training, I'll get you one. Come to my big schools at Chicago or Detroit. Easiest, pleasantest work you ever saw! Your own boss, money and suc. g* cess yours from the very be- ginning. Youcan start with a ‘‘shoe-string.’’ We prepare you ina few months to run a business of your own, to do any job. Common schooling, ability to use your fingers ALL YOU NEED! Free R. R. Fate J. E. Only a few hundred Laboratories in all the U. S.—most @ {Ff il 60 to 125 a Laboratory Expert at $3.00 an hour and sell their own R f learn mechanical work, start a “Lab” of your own, give them quicker servie o * there are many times perts, salaries are high, McCarrie - trained Experts sion, we will help you find a good location for your Laborato and Dentists everwwhere recognise e self in_a profitable business of your own after you become a Dent the high-standing of our grad uates. No books here—learn with tools and instruments C | Right this minute we can place 150 Dental Laboratory Expert tunity! Mail Coupon today! Catalog tells you how quickly and easily you can ‘hica r De f ——= Be 70,000 DENTISTS NEED ~? LABORATORY WORK! Jobs at them in Chicago and New York. Dentists can’t afford te do their own mechanical jobs. They can buy the services of a : : : time at $6 to $15 an hour. Dentists will encourage a Week ms than sending to Chicago or New York Dentists can't wait and kee patients waiting In a business where Fa ‘C here are many time : LABORATORY OF YOUR OWN! as a ( SAS IUX- ‘ Many of my graduates open a Laboratory of the a ae abend ahharet re] To encourage more men to go into this wonderful always get the preference— make a success of it. Write for complete information on bow you can f atory Expert in my schools INTERESTING CATALOG—FREE! Start quick—get ready in a few months for your big oppor- tions where they can do a business of $5,000 to $20,000 a year. Bu cash in, take advantage of these OPPORTUNITIES martial upper or 0 until you're read et ly, how it othershave SUCCEEDED! Tells you how you learn in a few months BY DOING ACTUAL LABORA- TORY JOBS under one of the world's vreatest Me- chanical Dentists! Brings you FREE R. R. Fare offer and dther big inducements. Write for free Catalog today! Day ie.School of Mechanical }>-»..:: Dentistry }: aS 8 Michigan Ave tent we'll help you 19201, F . Chicago, ll , | EARN while you LEARN! McCarrie School of Mechanical Dentistry, ; S. Michigan Ave. Dept. 2201-F, Chicago i Without oblivation, please send me your F ree R free catalog with complet¢ information abou me a Dental Laboratory EXPERT. How you W Ma Laboratory, how you will provide me with > my training, ete.

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a§ r{ vded jobs NTQ rato 288 Of man dozen -ERT most of ford te vices of { help wl iad try, icago, If i how I jot 18 J. E. GREENSLADE JACK WARD Chicago “T didn’t want to work for small pay. Hasily proved Mr. Greenslade was right—over $1,000 every month last year.”’ aa FREE! e directly to the point. First you'll say, “I could it. These men were lucky.”” But remember the se pictures are shown above are only four out of is and if you think it’s luck that has suddenly sands of men into the big pay class you're fooling Easy to Increase Pay zet down to your own case. You want more money he good things in life, a comfortable home of your you can entertain, a snappy car, membership in a good clothes, advantages tor your loved ones, travel { importance in your community. All this can be nd I'll prove it to you, Free. ill get this one thing right: such achievement is not KNOWING HOW! And KNOWING HOW in a ch your opportunities and rewards are ten times 1 in other work. In short, I'll prove that I can make ter Salesman—and you know the incomes good sales- ne of the four men shown above was sure that he r SELL! They thought Salesmen were “born” and uid, ‘‘Enter the Selling Field where chances in your n to one,”’ they said it couldn’t be done. But—I them that this Association could take any man of elligence—regardless of his lack of selling experience hort time make a MASTER SALESMAN of him— apable of earning anywhere from $5,000 to $10,000 nd that’s what I’m willing to prove to you, FREE. Simple as A. B. C. think my promise remarkable Yet there is nothing ‘bout it. Salesmanship is governed by rvles and laws. ert.in ways of saying and doing things, certain ways of £ & prospect to get his undivided attention, certain ways e objections, batter down prejudice and outwit com- u learned the alphabet, so you can learn salesmanship- zn the NATIONAL DEMONSTRATION METHOD— e feature of the N.S. T. A. System of Salesmanship Train- gain the equivalent of actual experience while studying. POPULAR MECHANICS ADVERTISING SECTION WARREN Fr. WYNW GEO W. KEARNS , omy Portland Oklahoma “After 10 years in “Last week my ‘From $60 a month the railway mail earnings amounted working on a servic e I decided to $554.37; this ranch, to $524 in to make a change. 4 “ Earned more than Week will go over two weeks, is the $1,000 the first 30 $400. ‘Thanks to step I took after days.”” the N, 8, T. A. this training.”’ Youre Fooling ' Yourself -if You Think These Bid Pay Records Are Due to LUCK! But don’t take my word for it! When I tell you that you can quickly increase your earning power; I'LL PROVE IT! I'll show you hundreds of men like yourself who have done it, And I’ show you how you can do it, toa The N.S. T. A. System of Salesmanship Training and Employ- ment Service will enable you to quitKly step into the ranks of suc- cessful salesmen-—will give you a bi¢ advantage over those who lack this training. It will enable you to jump from small pay to a real man 8s income Remarkable Book, ‘‘Modern Salesmanship”’ Sent Free With my compliments I want to send you a most remarkable book, ‘Modern Salesmansbip."’ It will show you how you can easily become a Master Salesman—a big money-maker—how the N. ©. T. A. System of Salesmanship rraining will give you years of selling experience in a few weeks; how our FREE Employment Service will help select and secure a good selling position when you are qualified and ready And it will give you success stories of former routine workers who are now earning amazing salaries as salesmen. Mail the attached coupon at once and you will have made the first long stride toward success. National Salesmen’s Training Ass’n Dept. G-12 N. 8S. T. A. Building Chicago, Il. eee eee eee ae eee ae ea ear ereese National Salesmen’s Training Association, Dept. G-12, N. S. T. A. Building, Chicago, Ill. Send me free your book, “‘ Modern Salesmanship,” and Proof that I can become a MASTER SALESMAN Name Address City State Age Occupation

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POPULAR MECHANICS Get into the Easiest, Most Fascinating Work in the World! If you're earning a cent less than $50 a week, clip cou- von now! Send for Free Book, LEARN DR AFTING "ositions everywhere. Short hours. Big Pay. onderful Oppor- tunities Draftemen are in contact with’ BIG ME N in line for pro- motion—BIG PAY. Amasing Careers built on Drafting, Practical Training from Practical Engineers Get that Free Book. Find out about,this Thorough, Easy, Simplified, Money-making Training. Common schooling all you need We guarantee to train you successfully—AT HOME, with actual Drafting Jobs Also Professional Instrum sate a oe Feme ~~ and indivi ival Lifetime Consultation Service FRE Fa “Job Method not narrow, one-man viewpoin “3 FRE E F MPLOY ME Nr SE RY ICE. Powerful Association backs you 1p DRAFTSMAN’S Outfit FREE—Many other big features epecial for limited time. Act Now!, GET THIS FREE BOOK NOW! Start to make money quick, like P. Noyak of Free land. a. He gays, “‘l was a laborer at $4.50 for ten hours. NOW it's $10 for Shours. Easy Work. You did it for me.’’ CLIP_COUPON FOR SPECIAL 2 FREE OUTFITS OFFER! ASSOCIATED DRAFTING ENGINEERS The celebrated “Job Method” Training Institution 1920 Sunnyside Ave., Chicago FREE DRAFTING BOO Address Me Personally, C. E. WESCH, Chief of Staff, ASSOCIATED DRAFTING ENGINEERS, nae The celebrated ‘‘Job Method” Training |,,_, —- os Soa Institution Scheel of Gretta - 1920 Sunnyside Ave., Dept. A 19, Chicago, I1.'= - Without: obligating me in any way, please send me your book, a pratting. the Foundation of Industry” absolutely free. Also com- lete Information of your home-study Drafting course, 2 FREE UTFITS and Special Offer. BD. o's. cn ccenseccess eibabskncwedéehGhhGhes ds weecktedtvonsanens SD i600 cercsesedddbederserssedseaddshes . 00000 crcnsbteekees Bn rinces ce ctcsniegacescusgnessneda PONE icc cs cenesesetness ADVERTISING SECTION LEARN 5B BY DOING al Every phase of all branches ; taught by Actual Practice In America’s foremost and oldest institution for trade training No Books Used Individual Instruction Start Any Day Write for FREE 64-page catalog THE NEW YORK ELECTRICAL SCHOOL 44 West 17th St, New York City Open All Summer PIANO JAZZq oo By Note or Ear. With or without music. Short Course beginners taught by mail. No teacher required. Self king a struction Course for Advanced Pianists. Learn 259 7 of Bass, 684 Syncopated Effects, Blue Harmony, ‘ Chime, Movie and Case Jazz, Trick Endings, f Breaks, Space Fillers, Sax Slurs, Triple Bass, Wicked Har mony, Blue Obligato, and 247 other gnubjects, including Ear Playing. 133 pages of REAL Jazz, 25,000 words. Al brings our FREE Special Offer. Waterman Piano School, 1826 W.Adams St. Los Angeles, it y I Adu S E AN ART IST . B WE CAN TEACH “ I ar YOU DRAWING in LW; your own home during your bly spare time. Twenty-five years of Pa tine successful teaching proves our abil- « bg ity. Artists receive large salaries. nel Write Today for Art Year Book taki SCHODI“APPLED AR Ant iti \ROOM No. 2 g BATTLE MIKA, — y big Every year cqes and poultry meat on an the money. ‘The demand is far greater supply. You can earn $1,000 a year inspare wit time or $5,000 a year in fulltime. Poultry lL raisers all over the world are using our tos methods with wonderful success. Learn r re; at home. Startas small as youlike. — rw ea ToL \ or no tor mis FREE BOOK \ 2.5", fin Free book,“ How to Raise Po for Profit,” telis all about our new, up-t« te, money- n d making poultry course, endorsed by leadin. agricultural schools, and about our prov por p lan of close, careful, individual instruction. uecess positively guaranteed if you follow our met . Send for your copy. Doittoday! The National Poultry Institute Dept. 151H Washington, D.C.

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POPULAR MECHANICS ADVERTISING SECTION 19 hy shouldn’t you, too, havea glowing, healthy body? Y Benny Leonard’s id Home-Course n . for Promoting ed = Physical Fitness alog K WONDER why so many people think that won the lightweight championship of the world. OOL nly athletes are supposed to keep in good I also trained thousands of American men in the physical condition. Why shouldn’t YOU— Army during the World War. As a result of all — r or whoever you may be—have the _ this, I have developed a system of physical cul- ad sings that go with a glowing, healthy body? ture that every man, woman and child in this work keeps you confined indoors—or if country can use in the privacy of their own homes = t doesn’t give you the chance to exercise your with much profit to themselves. a limbs properly, you are unknow- ~ saumcly bringing on untold ailments; you are Personal Attention to Everyone king a pitiable, flabby weakling of yourself. I study each person’s individual condition and ? * Do You Feel Pe : adapt my methods to your own requirements. Hi Right this minute stop to analyze your con- My system is unique—there is nothing else like Do you feel bright and strong and spar-_ it. It eliminates all possible harm of over-exer- ng; have you that springy step, that clear eye, cise. If you value feeling fit, if you want to make it keen, peppy ambition that only a sound, good in your present occupation or avocation, inging body can furnish? If you haven’t—you you should begin at once a regular system of nd I are going to become better acquainted home training under my personal instruction. ght away. For I have been making a very I'll send you my book that tells you all ntific study of the human body, both through about it—it’s FREE—send for it NOW—this trimental work with myself and through a minute, nstaking study through books by the greatest rities. , . I've Trained Thousands P Undefeated Lightweight \s you may know, I trained my own body from Champion of the World rail, “skinny” lad to physical supremacy that END FOR THIS INTEREST’ “Now I Can Tell You” is my booklet: 1 with interesting reading. It has !photographs and accounts which yo ver read before. Whether you are a ! or not, or a physical culture “bug” o find the booklet well worth sending nd it to you, FREE, just mail me t printed here for your convenience : ook is yours. Don’t put it off, send foi OW—while it’s on your mind. Lind Austin Adv. Agency, N. Y¥. C.

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20 POPULAR MECHANICS ADVERTISING SECTION learn CARTOONING 2 Hom 7 “I’m Going to Mak | m Going to a e It’s not unusual for successful cartoonists to earn $50 to$ | ; : a week. You can do as well and join most attractive profess ! 99 | even if you've never touched a drawing pencil befor ore one through a wonderfully easy method Cartooning can now e learned at home during spare time most convenient. [fy step from beginning to erd is clear and easy to understa . “T’m tired working for a small salary I Many students of this method began to sell their cartoons | Gh . . “ fore they were half through their courses. Every day { know I have just as good a head on me as F red new opportunities for the trained cartoonist — anywhere fr : Moore and Bob Roberts, for we used to work $25 to $100 is very often paid for single original drawig ° Learn to draw and cash-in on this ever-increasing den side by side. But they’ve gone far ahead of me. | all kinds of good cartoons eden a . Send for FREE BOOK Why? Because they saw the value of special A handsome booklet has just been prepared which is crammed‘ atl - . , of interesting information about cartooning, and describes training, and I didn’t. the remarkable method. It will be sent you without cost « £ tion. Mail postcard or letter today! “But I know better now. If the Inter- | WASHINGTON SCHOOL OF CARTOONING national Correspondence Schools can raise | Room 306C, 1113-15th St.,. Washington, D. ( the salaries of men like Fred Moore and Bob | LEARN WATCH REPAIRIN : 2 . ise ine ! Be a watchmaker—you can learn this profitable Roberts, they can raise mine, too! trade by correspondence in a few weeks in your own home by the DeSeims Chart System. After “= they have helped others to advance, they you complete the course you will know a Watch . . ’ : from AtoZ. You will know just what the matter can help me. Today —right now—l m going is and how to repair one. When you eraduate you will . . be a practical watchmaker and repairer and compe- to send in this coupon and at least find out tent to fill any position. Positions for our graduates ” Ask for our Free Book. it explains our system and terms. what the I. C. S. can do for me THE DeSELMS WATCH SCHOOL INTERNATIONAL CORRESPONDENCE SCHOOLS Box 5516-E, Scranton, Penna. Without cost or obligation, please tell me how I ean qualify for .— sé the position or in the subject before which I have marked an X: BUSINESS TRAINING COURSES | Business Management ()Salesmanship = Industrial Management ( )Advertising rT) Personnel Organization (Better Letters Ifs Cause and quire Traffic Management L}Show Card Lettering Business Law ) Stenography and Typing You can be quickly cured if you stammer. Send 10 cents, coin Banking and Banking Law )Business English | or stamps, for 288 page cloth bound book on Stammering and Accountancy (including C.P.A.) LjCivil Service Stuttering. It tells how I cured myself after Stammering and Nicholson Cost Accounting LL) Railway Mail Clerk Stuttering for 20 years. BENJAMIN N. BOGUE Bookkeeping [)JCommon School Subjects 692? Bogue Building, 1147 N. tll. St. _tndlanapels Private Secretary L) His h School Subjects ——— = Spanish C French Citllustrating © Cartoening LEARN TECHNICAL AND INDUSTRIAL COURSES | : Electrical Engineering [) Architect ric L ighting [j} Architects’ Blue Prints +L} Contractor a nd Builder is re mecicts |F Mey sz learn the secrets of World's Champions—how to wrestle expertly- how to bandle big men — ease hot to win. Be 3-7 strong y ° he Learn how to pay 8 yourself, Farmer Burn Soest anne ei te sea oe Mig tn se World’s Champions, wi P Champions, E and boy i Pagtey ~~ very man n no ma wh needs this information on SCIENTEIC WRESTLING - CULTURE — nU-NTSU— SELF DEFENSE. Book frej.2755 zs. ine and get my splendid 82 pege athletic book—absolutely ‘"# f any kind. ny kind. Write ROW. obligations © any 7 0 A om —

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POPULAR MECHANICS ADVERTISING SECTION 21 ’The Right Start Means Everything — ==>.) in this Auto Business There’s a tremendous demand for men who start right in every branch of this business. Let us start you right, in a big job paying up to °125 warn

= lome HERE is an old proverb, “The right way is always the easy way.” That’s true of any automotive or electrical A dire problem you’ll ever meet. It’s easy—in fact, it’s fun— efore. i when you know the right way. And that old proverb is ent. Eva especially true when you start to learn this business. The sartoons GREER WAY is the RIGHT way and the EASY way to ry day fin That coupon at the bottom of the page is your first step. Don't wait. Send it now and you can have that big job this summer. In Just 8to12Weeks

crammed ff ‘bes in det ost or ot THIS SEVEN STORY BUILDING we will fit you for a big paying job and help you get started in it, ' the home of GREER COLLEGE ire many courses offered for learning Auto and electrical work, but there’s only one GREER COLLEGI The plan has been worked out through my personal experience in training men for over 23 years. This is the oldest \utomotive College in existence, and our methods have been proven at every step of the way. If any better system of tra g were possible, we would have it. Our highest recommendation is the success of our 40,000 Greer trained 1 every branch of auto, truck and tractor work. Over 30,000 of them now own shops of their own. Of rse there are many ways pointed out for you to get into the Auto business. The de- r trained men is so great that some get excited and do not give proper considera- what training means. The worth while, top notch jobs are calling for men trained Greer Way. Neither long tedious apprenticeship nor any makeshift training can pare for one minute with the real “know how’ you get at Greer College. You learn . by actually doing, under a plan we have developed to greatest possible efficiency. There is no lost motion and no lost time in the Greer system of training. [Expert supervision shows you the way at every turn. FREE EMPLOYMENT SERVICE We help you get started in the job where you fit best, as soon as you finish training. If you need extra money while learning, we help you arrange for a part time job. There are evening classes for men employed in daytime. Everything is arranged to fit your individual needs, because your problems are our problems

conte, cots Get This FREE BOOK Without Delay mering and € President mering and It will give you some new angles on starting your career. This coupon will bring you = Dept. 601 the book and complete information about our attractive offer now open to a limited = ndianapolis ERWIN GREER dumber for summer training. Get into the big money field this summer by starting yead { this organisation Address me personally, < tince‘ebeginningin 1903 = CHICAGO, ILL. *

Erwin Greer. © Please send me FREE .Y BOOK “How!lto Succeed < in the Automobile and f World's © Tractor Business,” and ortl = special training offer. This = request does not obligate me in ; < eri s any way. COLLEGE Automotive rs ee Engi ne e ring f ES Oe nO ae eo Dept. 601, _ CHICAGO

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Doubles Salary | His Profits—5000%! Why Accountancy Training Pays “I say without boasting, and simply as a statement of | fact,’’ writes E. G. Wilh m, a Pennsylvania man, “‘that I have earned more than fifty times the cost of my LaSalle freiatog.' in special accounting work, since taking it up; and addition, my regular income, or salary, has in-reased | « roximatel 125 per cent.’”” —Not an unusual report from } ned man. During only three months’ time, as | many 2 as 1, 193 le definite salary-in- | totalling $1,248,526, an a increase per man of yt Promotion i is the rule—not the exception. re youmtike Withelm— pursuing a by ty yy plan to ary? Or are you relying nowledge picked up thru | day - =~! experience—casual reading—haphazard methods of study? Ifa ———* career is worth a 2c stamp and two minutes of your time, check the field of eo that appeals to you, fill in your pame and ress, and place the | ru your eae adv t upon coupon it in the: mail ’ TODA La SALLE E EXTENSION UNIVERSITY The Worild’s Largest Business Training Institution Dept. 664-HR hicago, Illinois Please tell me about your salary-doubli on as low Bend tomy advancement in the business field chee also copy of ““Ten Years’ Promotion in Onn” nie withou' obligation. C)Higher Accountancy Modern Business Corre- spondence and Practice O Modern Foremanship | | OBusiness Management and Production Methods | O Modern OTraffic Management O Railway Station Manage- ment O Law—Degree of LL.B. OCommercial Law OlIndustrial Management O Personnel and Employ- ment Management OExpert Bookkeeping OBusiness English oc > cial S ish Efficiency OBankingand Finance = De“ery"e Shettiat oe a ae Present Position Address . Wonderful, a few ——.. Big — — git oy in | hours. No failures. Com- new device, guides your hand; corrects your Writing | Write C. D-34, St. | . Osment, Louis, Mo POPULAR MECHANICS ADVERTISING SECTION We Teach COMMERCIAL AR Meyer Both mpany, y, the Commercial rganization in the World offers you a practical training base upon twenty-five years of success. This nationally known organization each year produces and sel to advertisers over 15,000 commercial drawing, This pone paid —— equally open to me and women. Home study instruction. GetFactsBefore YouEnrollinAny School Ask the Advertising Manager of the paaing © ewspapers in your city about th Company—let them tell you Send four ae my in stamps for illustrated book telling of the success of our argest students. iss Eli MEYER BOTH COMPANY AB Department of Art Instruction - a ILLS. ichigan Ave. at 20th a, A Note—Te Art and Engraving Firm + artists among ous graduates. witeen as. HOW TO SPEAK Ate GooD ENGLISH Easy and delightful way to learn good Enzglist home—without RULES. Spelling, granimar, puncte \ ation and expression, taught in 10 minutes a « 4 bi 4 ity to use clear, forceful, and convincing Eng wot P= || | ~~ » ee, ry undoubtedly bring you MORE MONEY M ORI i / POWER SOCIAL SUCCESS Write to~ for Free Book “How to Speak and Write Good Enciis and 10 minute test with apswers. Address ) ELMER CLIFFORD SCHOOL OF ENGLISH 213 W. Como Ave. COLUMBUS, OHI0 d WHY NOT fai‘gathering butterflies, insects? I buy hundreds of kinds for collections. Some worth$ | to $7 each; simple outdoor work with my instructions, pictures, price-list. Send 10c (not stamps) for my Ilustrated Prospectus before sending butterflies. Mr. Sinclair, Dealer in Insects, Dept. 6, Box 1424, San Diego, Calif. 4 —e =) We ~ pe a wonderful new copyrighted system of teacuing note musk t ever yi] taking this course we will give free a $20 superb t 7 ty awaiian-Guitar, Banjo, Mando lin, Banios kulele Ban, N and net or Banjo-Guitar absol utely tree. Also teach Piano and Organ v pred for lessons only. our lessons will teach you several pieces qe ceasful peruse. guarantee success of no charge Compl+t te today. Dept. 214. a obligation. Slingeriand School of Music, Lincoin Park P. O., Chicago, © wt WANTED RAILWAY POSTAL CLERKS $1900 to $2700 Year (All Postal Pay Just Raised) MEN — BOYS, 18 UP Postal fae Examination a 2) 7 ernmen € open to men, 5S up; na fre WRITE IMMEDIATELY coaching (4) Send free illustrated book, "How t0 Steady work. No layoffs. Paid vacations ment Positions. Travel—See Your Country io, “gS sdunalive snksceeesbosguaheendhecmaiens Commen education sufficient. Mail coupon teday — SURE! 7 PRANKLIN INSTITUTE, Dept. D-180, ROCHESTER, ¥.! Sirs: Send me without charge, (1) Specimen Ra / ————— ns... wal.

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POPULAR

-_ ive

BLISS 6 special technical Electrical ts construct motors, install wiring and test electrical Bliss Electrical School,216 Takoma Ave., Washington, D.C. CHOOL school, yncise but comprehen- ourse, men with training are in demand. For more than 30 years this school has ing men of ambition and limited time, for the elec- justries. Condensed course in L-lectric ai Engineering od positions and promotions. tricity. a grad uates to Theoretical and Prac- Mathematics and Mechanical Drawing. Course with diploma complete In One Year Over 4000 men trained. Thoroughly equipped fireproof dormito ics, dining hall, laborato- ries, shops Prepare for your profession in the most interesting city in the world. Free catalog. 33rd year begins Sept. 30, 1926.

DO EARNED E Oe inane — Well-trained artiste earn splendid incomes. The Federal home-study Course is a proven result-getter. I/ you like to draw, send 6c in stamps for 56-page book “Your Future.” State your age and present occupation.

Federal Schools Building Minneapolis, Minn.

FEDERAL SCHOOL OF COM'L DESIGNING]

Abe Lincotn did it! Ap thousands of other greaf lawyers, men. YOU, too, can "become a lawyer Ro home study undeg guidance of the successful practicing lawyers T Free pa nad today for our special offer of American Correspondence School of Law HOME 3601 Mich.gan Ave., Dept. 135A, Chicago

MECHANICS ADVERTISING SECTION

-RAY. Learn This CHICAGO TECHNICAL COLLECE* Drafting Engineering Electricity and Architecture [2and Year | MAXIMUM of practical training ina minimum of time is offered you by one of “America’s oldest and largest schools of special- ized engineering” ... technical train- ing of college standard for men who have neither the time, money nor preliminary education to attend a university. Over 1000 men enroll each year in day and evening classes. Short, Intensive Training of a very practical sort puts you immedi- ately into a high salaried position. Many of our students are placed in responsible positions before graduation ... they earn while they learn. Chicago Technica! College Bidg.

If you can’t come to Chicago Courses are

arranged to suit your needs: 2- fascinating and profitable profession. Start any time. Takes 3 to 9 mos. Graduates now getting big pay. Write Wy full particulars to NATIONAL SCHOOL OF X-RAY, Peoria Life Bidg., STUDY AT HOME Peoria, Oi. year diploma; B. 8. 3-year

Yoo don’t need a music to become a piano expert. Read the beoklet and get the whole story. Earn $250 to $500 a month

aE You don’t need o mated education, you don’t fecsion, ane aie oe It pe. f i -~ the even need an ear for music--yet you can become co SCS u aescTip- =a, an expert under our system and make $250 to FREE OUTFIT . 1): al I $500 a month and more in ‘bis pleasaact, inte o sentiee 005 Geatienetno tions); about the great demand for Chicago Technical College : trained men; about pe Se hee Learn in 12 Weeks 40-Page Book college sthietioen ond aval . f facts about draft é é arene an ear for pT ny ee eT oe send for it. free. Write other interesting facts you'll want to know. nse for the Blue Book no without obligation! Addre 38

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EARN *50t°*200 A WEEK!

This is the time to get into Radio—the new, fast growing, uncrowded | pee Stop working long hours for small pay at werk that is drudgery. Men from all walks of life are taking advan- tage of the big Quervsities now open in this wonderful new industry. Salaries of $100 a week—and more—not at all uncor nmon! Learn at Home You can train for this ‘‘big money” field right in your own home—in spare time. No matter how little you know about electricity or Radio, the National Radio Institute —the largest and oldest home-study Radio school in the world — established 1914—can quickly make you an ex- pert through a marvelous method of practical instruction which includes all the material for building the latest Radio apparatus Demand Now Almost every day we get urgent calls f or our graduates, The big jobs hunt you when you are a Radio expert. tadio offers you more money than you ever dreamed possible—a chance to travel or to take any one of the you a glorious future! Send for FREE Book this great new money-making field— [I and describes our amazing practical Mail postcard NOW. National Radio Institute, Dept. many Radio positions all around you at home. Offers Write today for free book “ Rich method which gets you the bigger 1S5HB, Washington, D.C ' Rewards in Radio.” Tells all about ~h pe ing jobs in Radio. No obligation.

The National Radio Institute, Dept. 15HB, Washington, D. C. T am interested in Radio as a profession. You may send me, free and without obligation, your interesting book, “ Rich Rewards in Radio,” all information about your spare time, home-study plan and about your free employment service. Also, the details of your Special Offer Name Btreet Sn cies ccc cccsce vi scvcccccccsédecdiesstess MMDnSss, cdetes POPULAR MECHANICS ADVERTISING SECTION

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Lewis Institute is nized internationally as the leading authority in nam 9 correction. Stadents come from nearly every es Gpeking country. Its wates number over 1} Medics authorities endorse its methods and results. Lewis instructors are former stammerers long expe- | rienced in re-educational work, Both Resident and Home-Study courses co: Cc lete, permanent | correction of starmering and stuttering ‘guaranteed Don’ t Fo through life handicapped. Stammering is | aoe | if ever outgrown. Your happiness and success depend on freedom of speech. Write ates for catalog. Learn how easily stammeriny is corrected 42 ee PIONEER L = LEADS THE Ali The LEWIS INSTITUTE |

ETROIT, MICH Lesh Logan HOME cere $3000 to $10,000 a year. Pre me. Also earn while you learn. ew ey, method. Not |= else like it. Send at once for free boo “Opportunities Medern Photography” and full particulars. Special offer now INTERNATIONAL STUDIOS, Dept. 135A, 360! Michigan Ave., Chicago, U.S. udwig of the new | ad ear ment

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om — a Tri-State Dellees of Engineerin Makes you a Civil, Mechanical, in two years, 48 weeks each. School Diploma not required only. Expenses low. For catalog address, Start Little Mail Order Business—Free Book Home employment evenings. Beginners Outfit furnish Book Free. Pier, 842 Cortiand St., NEW vors SIGNS & SHOW-CARDS Painting Made ou too, can paint attractive signs and showcards with the'aid of Let: Soret trace around the letter pattern and fill in. me.‘ ~ be ast quic’ Nely you can paint a sign by this method are ct able oiled stencil board with smoo res, which rs 7 ter rapi Each alphabet contains all the letters and the character 4 etamp tor sample or better s'il! order a few sets, and you secon will want m ABC ABC ABC ABC HBC ABC abc 123 abc abe 123. 123 ABC 123 4

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POPULAR MECHANICS ADVERTISING SECTION ‘ YOU CAN PLAY THis ; FREE! Professional Style HAWAIIAN GUITAR — cenuine » HAWAIIAN JUST LIKE THE HAWAIIANS! = = Guitar aa ee 4 es ell

ie 4 BECAUSE OUR NATIVE HAWAIIAN WORTH $15.00 - INSTRUCTORS WILL SHOW YOU HOW! Serget tn Gee Goons nt Be the Most Popular Member of your Set. Play *““What'll I Do”, “So, Is stores for these beau- d Lov *‘Memory Lane’’, ‘“‘Minding My Business’’, ‘‘Fair Lady’’, ym tiful Hawaiian Gui- Linger Awhile’’. All the late song and dance hits. "You can play First Selec- tars. We can afford is | nin Half an Hour and Harmonious Chords at “yr Entertain your friends. togive them away free ss | y for money. Don’t be a wallflower. Party. of charge to every pu- | FAMOUS HAW ALIANS TEACH YOU TO MASTER QUICK.- il because we oo ne LY THEIR SECRETS OF THIS FASCINATING 1c aatare . them - auge 42 The instructions receive from such world famous experts as Lawrence quantities - -_* the » | Kalaluki, Walter np Bane ony Frank Ferera, Carl Seville and others are invalu- owed . eets ged in- ble. NO OTHER Conserv atory can even begin to give you the expert teach- 4 argos ie in P and coousenee xen gain through us. And remember, while it is conceded / a che wort _— , the Hawaiian Guitar produces the sweetest music, yet its mastery by #7

will be simple and quick. We guarantee it NLY 4 EASY MOTIONS — ‘0 learn to be able to play any music, popular, -lassical, native Hawaiian Airs or old time melodies and hymns. Just think of t! You need never have read a musical —_ in your life. For that matter, even, though you haven't the slightest knowledge of any musical in- istrument, we guarantce to teach you to play just like the native Hawaiians. eects. = ive fasci eNiGlesity /A WA NEW INVENTION| © enecs eet the vas WAN a -<eciaaiaiatidl

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26 BARBERING sand a of ya Highest Paid . Every Week! Re sas 150 TAT a } »/\7 SLAVIN ; Quick to Earn! That’s BARBERING for YOU! the And 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 B s @ MOLER trained Men are always given the prefer- u y: 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 out why MOLER Men are making DOUBLE the money others made last year, before Ladies’ Shingle Bobbing became so popular. You're NEXT in line for big pay—the MOLER way. Send Coupon TODAY! Moler System of Colleges 30 Branches in United States and Canada New York, N. Y. Chicago, Ill St. Louis, Mo Kansas City, Mo. Cincinnati, Ohio Cleveland, Ohio MOLER SYSTEM OF COLLEGES Address Nearest Branch (Street Address NOT Needed) Detroit, Mich. Denver, Colo. Omaha, Nebr. Milwaukee, Wis. New Orleans, La. Atlanta, Ga. Memphis, Tenn. Dallas, Tex. Houston, Tex San Antonio, Tex Please send me without obligation on my part your Booklet B, Name POPULAR. MECHANICS ADVERTISING SECTION The Finger Print on the Gun Two shots rang out in the dark- ness with but a single report, One found its kinthe heart of an in- nocentman. The other crippled the gun arm of the murderer. A thril- lingescapet gh a cordon of police But behind lay the murderer's revoly- er with the telltale finger print clearly impressed on the smooth, bluedstee]. Almost every paper tells of the exploits of the Finger Print expert, the master detective. Why ; don’t you — Be a Finger Print Expert More men are needed every day. But only trained men are wanted. We will train you at home in your spare time, as we have trained many of America’s greatest experts. Big salaries Big Money to Experts >:,":'s\ Rich rewards offered for ‘‘wanted”’ man. Unlimited opportunities for a professional business of your own. Special Offer Now Write at once. Get full details. Also our Free book on Finger Prints, full of true stories of crime mysteries solved by our aduates. Free Professional Outfit and Free course in Secret Service Intelligence if you enroll now. Write today. University of _ —y Science 1920 Pama yh pt. 4-135, Chicago Com Conservatory by Mail Wonderful home study music lessons under great American and ry: puropeen emer mo = y erew: . Mas’ teachers Al Hi 0 m guide and coach you. Lessons 4 Selo gamtus compas Fan pan ieemerted Any instrument Fos fay, Vibes Pot FREB'CATALON. SEND fore lowl” — University Extension Conservatory, 165 Siegel-Myers Bidy., Chicaro LEARN WATCHMAKING and become independent. Good-paying positions secure Easy to learn Send for FREE CATALOG ST. LOUIS WATCHMAKING Dept. 5. ST. LOUIS, MO eee BECO : I / rr AD ae). i MAKE MONEY CHALK TALKING. SEND $/00 - 4 PROGRAM OF TRICK ORAWINGS WITH INSTR PROF ESS/(ONAL CARTOONIST SATISFACTT ARA ow Ge C/ACULAR FREE. BALDA ART SERVICE. 1. OSHKOSH WIS *40% Suit for *23* a ult ror You don’t have to have experience in selling such goocs. In fact y¢ don’t have to have any selling experience whatsoever. The 0b!) question is, could you sell a $40.00 value for $23.50 if given a p ful. impressive selling outfit with which;to do it, and caré complete instructions on how to go about it. If you think you we'll take you, equip you, teacb and train you in a way th assure you earnings of $75.00 to $150.00 a week and even provided you're honest, thoroughly dependable and willing to hard to make the most of what is really an unusual opportu! the right man. We're an old established house of unques reliability and responsibility. We work with our salesmen an back of them in a way that few houses do. That's why w' particular about the men we take. If you, too, are particular the house you work for, let us hear from you and when you tell us all about yourself, who you are and what you v¢ Address Dept. 423 WILLIAM C. BARTLETT, Inc. 850 West Adams Street CHICAGO PO] Room

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The Most Important oo in the World are mune from temporary sickness and hich shortens life. The Next Most important Thirg is the way you look. Your al ap nee counts for a lot in these times. fee is nice to look well ina a bathing suit, at itis far more important be able crea street ci one glance chest, trim Preiet and beautiful p prepor- tons noticeable even when you are fully dressed. wy METHOD is NEW. effect is so sure and rapid that— eginners, who cannot even chin themselves with both arms, soon an easily chin the bar with one arm. it beginners, who cannot even cence Getr ankles, can soon learn er and put che pains of t their wii bending and tales ly reducing their waist Cate rom eight to ten inches). “ ny beginners soon find themselves gaining weight and shape- _~) of their Geveneed digestive powel. leve mners soon find themselves taking pride in their + and clean-cut muscles. t non-athletie beginners soon find that they are in posscasion of the trength that e them winners in sports and games. — Control, Tumbling and Hand-Balancing Are Given You in in My Free Book title of this Absotutely F ik is, hones It shows you how to sctunly porto k of its kind, besides ct oapleining my rmore, it is fall of halftone pienes ey P , ‘ cat number of my magnificently developed re are sixty- r pares " agnitooet Cay and desir le instructions tor you Free Don’ ne for mailing charges. You'll enjoy this book, so for your copy NOW. CHARLES MacMAHON Sette O13, 180 W. Semorset st. BE A PRACTICAL ARTIST! Win Fame and Fortune. The new book, “PRACTICAL ART,” tells you how. 86 Lessons, over 250 illustrations. Drawing made easy, complete instruction. Covers layouts, illustrations, cartooning, lettert for art students, cartoonists, commercia artists, fashion artists and illustrators. Written by Manuel Rosenberg, well known illustrator. $5.00 per copy, postpaid. SIGNS OF : THE TIMES et « ther t +3 ery Publishers — Cincinnati, Ohio sie «20 Mathematics Made Easy by pachers - = /ROPP’S CALCULATOR oak, AND SHORT-CUT ARITHMETIC vl onl Shows the Answer as Quickly as a Watch shows the Time ago pall Problems likely to occur in the Office, Store, Shop, = Mebank, Farm, or Factory. Over afe0,nee Explains and sim- lifes every princi > Arithmetic, e en- chanics, and sura ° PRICES POSTPAID Desk Size. .$1.50 Leatherette,Pock- et Size. ..$1.00 Pocket Size, Cloth Pocket Size, 7 Paper... .$0.35 Popular Mechanics BookDept., 299 E. Ontario St., Chicago -_ | Automobile Tourist’ S | Handbook 1 | w to keep food cool and free from dust while on | i; how to provide sleeping quarters inside the car; | provide plenty of room for baggage; how ‘to avoid ible on the road; how to build a combination bed fj gage carrier; how to cook food without carrying a | | g ve; how to make tents, cots, and stools, how to jf} t radio set for touring, and dozens of | ractical articles needed when you are nat 96 pages, thoroughly illustrated. 5 0 Cc | | POPULAR MECHANICS PRESS | Room 706, Popular Mechanics Bldg., CHICAGO, ILL. | POPULAR MECHANICS ADVERTISING SECTION i doing spare time Learn Electricity Male Bis M How would you like to earn two or three dollars every evening after school and prepare yourself for a fine big job at the same timie? Here’sthe opportunity of a lifetime for you fellows Wha who like Electricity. Begin right now to Look e prepare yourself for a regular man’s size job in This Boy this fascinating field. Your chances for a big Is success are simply wonderful—the pay is big (870 Doing to $200 a week) and advancement comes swift “Althoagh the and sure. Scbeot term fe'com: I will Train You at Home | == ot With my easily learned, spare time Elec- to keep ‘up trical Course I will train you at homelike | S.),.m7,aecg'™ I have trained hundreds of other w I forgot are - Froese f now big successful! men. It will not interfere with -4- oul pow your school work and you can earn more than t to = Jae email! cost of the course doing odd dlectrical yobs a. nT pare Sno in Ty spare time. The Course pays for = f. - If it had not been for will show you how to get this work and your 1, being do it. Some of my boy students aoe foe to sis under could not a week this way. a , A, But I got ft, and now Tools, Apparatus and Shee Ls | Course—FREE a iees cee tae Send me the coupon below and I will tell you all about the big outfit of soaks, apparatus and in- struments and a new ree that I am giving to my students for . “limited time. I will send you my big interesting Electrical Book and @ sample lesson, too—all Free. You will be tickled with the things I will send you Free. Mail the coupon right now. ot - COOGEE, Chief Engineer Seice Engineering Works ROGER SMITH. Greenville, Are: Use This “FREE OUTFIT” Coupon L. L. COOKE, Chief Engineer orks, Chicago Dept. 01-A 2150 Lawrence Avenue, Chicage peng me your Free Outfit Offer, your big Electrical Book, Sample —_ and particulars of your Electrical Course and Free Radio Course. This will not obligate me in any way. en Fn — This Goupon only for use of boys 15 years old or more.

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28 POPULAR MECHANICS ADVERTISING SECTION The Letter That aca Bob Johnson’s Job —and paved the way for a better one! I’ Was written to his employer by the International Correspondence Schools. It told how ‘Robert Johnson had enrolled for a course of home-study and had received a mark of 94 for his first lesson.” Bob answered the summons to the Chief’s office with just a little fear and trembling, for a lot of men were being pues lot more were having their pay reduc But as Bob came in, his employer did a surprising thing. He got up quickly from his desk and grasped Bob warmly by the hand. “TI want to congratulate you, young man, on the marks you are making with the I. C. S. I am glad to see that you are training yourself not only for your present job but for the job ahead. “We're cutting the pay-roll. Until I received this letter, I had you in mind as one of the nfen to be dropped. But not now. Keep on studying—keep your eyes open—and pretty soon there’ll be a still better job for you around here. We’re always looking for trained men.’ Won’t you let the I. C. S, help you, too? Won’t you trade a few hours of your spare time for a good job, a good salary and the comforts that go with it? Then mark the work you like best on the coupon below and mail it to Scranton today. That doesn’t obligate you in the least, but it will be your first big step towards success. Do it now! ]= = am 68> Go G&D Gm Om” oe ee oe om Oo oe om oe oe = ot INTERNATIONAL CORRESPONDENCE SCHOOLS Box 5515-E, Seranton, Penna. Without cost or obligation, please tell me how I can qualify for the position or in the subject before which I have marked an X: BUSINESS TRAINING COURSES Business Management ()Salesmanship Industrial Management [ )Advertising Personnel Organization |) Better Letters Traffic Management 1] Show Card Lettering Business Law (j)Stenography and Typing Banking and Banking Law { ) Business English Accountancy(includingC.P.A.) (CJCivil Service Nicholson Cost Accounting ) Railway Mail Clerk LJ Bookkeeping LJCommon School Subjects Private Secretary b High School Subjects Spanish CJ French llustrating 0 Cartooning TECHNICAL AND INDUSTRIAL COURSES Electrical Engineering Architect Electric Lighting Architects’ Blue Prints Mechanical Engineer Contractor and Builder Mechanical Draftsman Architectural Draftsman Machine Shop Practice Railroad Positions Gas Engine Operating Civil Engineer Surveying and Mapping L)Conerete Builder C)Structural Engineer Chemistry [) Pharmacy Automobile Work Airplane Engines Metallurgy Navigation Steam Engineering Agriculture and Poultry Radio Mathematics UID vescncsene venrcneccspnnedenttvemndsnsietecbatbudeabensssesnsedsesce~ussecncesscetouaninntoesssscats Street -6- Se Se a ee ee: — SE vail es rendnsoiceinrininsineeesdensnsinnnnsiceninenaniecaee ND ennsneanitditisininciammiansdissitaaicisaadanis Occupation Persona residing in Canada should “send ‘this ‘coupon to the Interna- tiene! Correspond Sch 0 » Limited, Montreal, Canada Teacher Learn at Home by wonderful print-and-picture method that teaches in half us ual time. Simple as A, B, C—, child can master it. Your lessons « sist of real selections instead of ‘tire some exercises. When you finish on of ne eee easy lessons you'y added a new “‘piece’’ to your list. \ read real notes, val no ‘“‘numbers trick music. Method is so thorough thy Play by NOTE iano, Organ, Violin, Cornet, Mandolin, Harp, ’Cello, Trombone, Flute, Clarinet, Piccolo, Saxo- phone, Ukulele, o Spores 44> Guitar, Har- many of our 300,000 students are ba phys mony and Com- and orchestra LEADERS. gontten, Banjo, a Nerv C voner Banjo, Automatic Speech Cul-| Finger Control and be Au- Our own invention — limbers, trains tomatic inger Control, Piano Accordion, etc. and guides your fingers so that they fall into proper place almost automat ically. Free Book and Illustrated Folder You may quickly become a fine player or singer through t U. 8. Sch hoot home study method. Write now, however, b ae book and illustrated folder are gone. Mention your fe vorite instrument or whether you prefer vocal music. Please write your name and address plainly. Instruments supplied when needed, cash or credit. Address U. S. SCHOOL OF MUSIC, 76 Brunswick Bldg., N. Y.C. LEARN ENGINEERING Great Demand for Practical- Technical Engineers. Big Salaries. Wonderful Opportunities. Thousands of our graduates holding responsible high-salaried positions. Practical- Technical Courses from 3 Months to 2 Years in Electrical and Mechanica! Engi neering. Simple and Condensed Method. Faculty of Trained ks perts. New Building. Extensively Equipped Laboratories and Shops Department of Architecture. Structural and Mechanical Drafting Degrees Awarded. Positions Secured. Day and Night Sessions Catalog D. FREE. Ask about our Earn While You Learn Pian FINLAY ENGINEERING COLLEGE, Kansas City, Mo. Stop Forgetting Make Your Mind an index from which you select facts, figures, names, faces. Develop concen- tration, self-control; overcome bashfulness, forgetfulness Write today for FREE memory and concentration test and illustrated booklet, “How to Remember." PROF. HENRY DICKSON Dept. 7056 Evanston, ll. A FILE NOT A PILE High-Grade Instruction By Correspondence Prepares You for the Bar—Est. 1892 Methods. Standard Text- Books. Approved by Bench and Bar. Graduates prac- ticing in every state. Send today for Free Catalog and Rules for Admission to the Bar. CHICAGO SCHOOL OF LAW. 802 Reaper Block, Chicago, [IL Universit When workit NOTICE—-All men, women boys, girls. 17 to 65. willing to accept Government Positions, $117-$300 monthly, traveling or _ station- ary write Mr Ozment, 111, St. Louis, Mo AT ONCE

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POPULAR MECHANICS ADVERTISING SECTION 29 ERVE STRAIN The high pressure, mile-a-minute life of today, with mental strain, worry, anxiety, grief and trouble, mention nerve strains resulting from excesses ne Have your Nerves stood the strain? i vices, is wrecking ihe nerves of mankind. ially to the people with highly active brains and sensitive This ap- icture “ . usual Me FE Verve Force,” a 64 page book on the care of the nerves. C~ MT : is of extreme value to “‘near-neurasthenics” and people 18 con " tive and deranged nerves. It has aided many thousands t ‘tire Q ontrol of their nerves and build up their Nerve Force oun MM Because of the many valuable hints it contains on the control of \ nerves and mind, ‘* Nerve Force’”’ has been bought by the thousand re by large corporations for their employees; it is recommended by ; physicians to their patients and by ministers to their flocks. Nerves or No Nerves, You Should Send ao oa gs — pecan s ul of “Nerve Force” and various other for this Book Today —_ on Health, Psychology, Rresthine, i Tygiene and kindred subjects, many of whic ol PRICE 25c POSTPAID (Coin or Stamps) have been translated into foreign languages. rains, y t they What Readers of ‘‘Nerve Force’’ Say: : 1at gained 12 pounds since reading your book and I feel gs energetic. I had about given up hope of ever finding the caus my low weight.” been treated by a number of nerve specialists, and led from country to country in an endeavor to restor nerves to normal. Your little book has done more all other methods combined.”’ your book has stopped that dre adful feeling of FEAR ch paralyzed my stomach and digestion.” Write to PAUL von BOECKMANN, Studio 491, “Your book did more for me for indigestion than two courses in dieting.” ‘My heart is now regular again and my nerves are fine I thought I had heart trouble, but it was simply a case of abused nerves. I have reread your book at least ten times. ‘The advice given in your book on relaxation and calming of nerves has cleared my brain. Before I was half dizzy all the time.” A physician says: “Your book is the most sensible and valuable work I have ever read on the prevention of neuras- thenia. I am recommending your book to my patients. 110 West 40th Street, NEW YORK CITY NG | alaries, | = + holding artoons. Commercial. and trating, rial e OUTSES traits and Seckions. Our poor method quiekiy Iv develovs your talent | 1] Engi By Mail or Locel Classes. ite for terms and } as JATED ART STUDIOS, bv B, 100 W. 23rd te NEW YORK In your own home— AGENTS—500Z Profit Genuine Gold Leaf Letters GUARANTEED TO NEVER TARNISH Anyone can put them on stores and office windows. Enormous demand, large profits. Paul Clark says: Smallest day $28.70. R.L. Reel made $920 in two months. Write today for free sample and PIMPL Y= When a few applications of this wonder- working lotion has cleared faces of pimples, blackheads, acne eruptions on the face or body, barbers itch, approved in over 100,000 Test Cases. The simplicity of the treatment, and The Story of How I Cured M: Myself are all ex- E. $. Givens, 128 Chemical Bid, Kansas City, Me. liberal offer to general agents. Broadcasting. Yet, the METALLIC LETTER CO. cost of the Deagan 433-C N. Clark, Chicago Xylorimba is no greater than the cost of any lained in my free booklet, “A Clear- SOD daiwecvicgeet vests 50s Skin.”” Write for your sh to- day and learn of the resu i ec Become a crack Xylorimba player right in your own home. Easiest instrument to play. Everyone enjovs it—anyone can learn to play it. We furnish yeu free 14 complete lessons. Learn to play in a few hours. Earn $80.00 to $200.00 a week. Deagan [ instruments are world- renowned—used exten- sively in leading dance, theatre and concert. or- chestras, and for Radio other good instrument. DEAGAN XYLORIMBA With this instrument you can play either for profit or forfun. Deagan instruments furnish the ‘‘spice’’ of the music. Used exclusively in recording studios for phono- graph records. Free Lessons—A Year to Pay Our free trial and easy payment plan make it easy to learn at home. Send coupon below for illustrated lit- erature and details of our special free trial offer *SEND THIS COUPONecesecessccccss J. C. DEAGAN, Inc., Dept. A-135 Berteau and Ravenswood Avenues, Chicago, Ill. Gentlemen: Without obligation, please send me literature and full information regarding your Free Trial Deagan X ylorimba offer

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30 POPULAR MECHANICS ADVERTISING SECTION >7100 aweek fom his own Photograph Studio “My income now averages from $700 $1000 a week,” writes Michael Ga owns his own photographic studio « ionable Fifth Avenue, New York adds, ‘“‘My portrait studies bring me much as $250 a dozen.” Hundreds of others are earning big mor everywhere. Amazing growth of sional Photograph offers chance of a lifs time; high salaried position or your business. $20 to $75 a week in spare time! LEARN AT HOME st gy experience or special ability | nee wo New easy method makes you a Pro- WwW } * fessional Photographer in spare hours at home. Famous experts of New York Institute of e 2 ! Photography train you by mail. All branches: | ; din > > : > Y ou Want to Earn Big Money! Motion Picture, Portraiture, Commercial, News Photography. Earn while learning ey yt — CAM ERA FREE ‘ And you will not be satisfied unless you earn stead motion, But are you prepared for the job ahead at yout you? | Do you measure up to the standard that insures success? J | pinche abotuey oo... tf hen one oe er toe Fora more responsible position a fairly good education is theatres—View Camera is latest professional model for all | % our New Yes necessary. To write a sensible business letter, to prepare still photography; genuine anastigmat lens. nap a estimates, to figure cost and to compute interest, you WRITE FOR BOOK tion. day or evenin must have acertain amount of preparation. All this you Handsome big new book explains wonderful opportunities; | Catalog R-49 must be able to do before you will earn promotion, positions paying $80 to $250 a week, how to, start your own | nearest addrow: Many business houses hire no men na eneral know- jeter today for FREE BOOK and free Camera offer : ledge is not equal to a high school course hy? Because New York Institute of Photography, Dept. ae, big business refuses to burden itself with men who are 143 West 36th Street YORK, barred from promotion bythe lack 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, giving 7, all the essentials that form the foundation of practical usiness. It will prepare you to hold your own where jy - 3 P.pt AY J +4 i? Biege = competion is keen and exacting. Do not doubt your abili- opportunities now, in adverdaine than ever before. Tremendous « po but make up g x yt it and you will yg Send for FREE Book. ‘oun interesting information and vital the requirements that wi ring you success an ig facts — just what you want to know about advertising. Write today money. YOU CAN DOIT. PAGE- Pavis Scnoot OF ADVERTISING Let us show you how to get on the road to success. Sept. 258 — ot It will not cost you a single working hour. Write today. It costs you nothing but a stamp. American School Dept. HA74, Drexel Ave. and 58th St., Chicago Write quick for our re- markable offer. Learn NOW TITS OUTFIT FREE eee eee ee eee i ee at home, in spare time, by ur new oad — Ff Gear a= a= ape instruction method. Commercial tooning, Illustrating, Design ~~. 1 fase inating work in big de American School Dei for ‘one drawing, “Hard Dept, HA74, Drexel Ave. and 58th St., Chicago Send me full information on the subject checked and how you will help me win success. explains every in SE ND ‘TOR IT TODAY WASHINGTON SCHOOL OF Room be isin he ” . Washington, 0 ....-Architect ....Business Law * ows Raiding Comtractor ea Lawyer eats N Oo .... Automobile Engineer .... Machine actice ...-Automobile Repairman’ ....Mechanical Engineer M Oo RE ...-Civil Engineer ...- Shop Superintendent Kill the/fear of stammering. Re-education the ke) .... Structural Engineer ....Employment Manager widely famed Hatfield Method fully outstned in ar - ....Business Manager ....Steam Engineer curate, dependable, worthwhile book—-"HOW .-..Cert. Public Accountant . F"oremanship STOP STAMMERING.” It baci nepired thousands. Free copy = ....-Accountant and Auditor ....Sanitary Engineer THE HATFIELD INSTITUTE, 109 N. Dearborn, Chicago, tik .... Bookkeeper .... Surveyor (& Mapping) ....Draftsman and Designer ....Telephone Engineer ....Electrical Engineer pa peezeph Engineer ....Electric Light & Power ....High Sc 9! fyraduate ... General Education .... Wireless Radio ee a o> queen Give. ..-. Vocational Guidance .---Undecided ~~ "tame ender tan furs, make rugs Complete lessons. Easily and Name

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POPULAR MECHANICS ADVERTISING SECTION Tenor Banjo FREE Read §~ = Bis Offer Become Popular Over Night Thousands flock to New York’s many jazz palaces every night, which proves how magnetic and irresistible jazz is. You, too, can become popular, irresistible, magnetic. We start you by furnishing free when you enroll, with a full tone, pro- fessional size $18.00 tenor banjo. No red tape or strings to offer—you get tenor banjo immediately when you enroll. The simplest of all to learn to play is tenor banjo, because we have devised a method of instruction so simple, you quickly learn, even if you have neve r had previous mus ic knowledge. Rush coupon and secure our book in colors, ‘How to Learn To Play Tenor Banjo,” and we will also send your first lesson free. Act quickly. Learn to Play Quickl With Our Picture Method Rush coupon. We will send you by retufn mail our beautiful ; ‘ ; book in colors, ‘‘How to Learn to Play Tenor Banjo,”’ and Besides furnishing you with also your first free lesson. We will also reserve for you an easy-to-understand printed les- $18.00, full tone, professional size tenor banjo which will be sons. we also furnish you with presented to you as a gift when you enroll as a student. et - . » Thousands of happy graduates from our Academy today show pictures of ous professors their diplomas to their friends and are ever increasing their playing. It is easy to imitate popularity with their tenor banjo education as a stepping pictures and do the right thing. stone ' You, too, will — oe heave — but you must You also get phonograph rec- act therefore sign and rush coupon today. ords from time to time of our professors’ playing which is really a visit to you. Another exclusive feature is our Gain- Time Chart which enables you to play quickly. This chart has Worth RIO 22 years Prof. John Martell pretured at right, is famous as @ great tenor banjoiat. The combined ¢fforts of both professors offer you an opportunity (o lear” to_ play. - ' ' ' ' ' ‘ ' ' ' ' ! ' \ t ' ' i ! ! ' ' ' ' ' ' i em en mee a eH” NEW YORK ACADEMY OF MUSIC Studio 16, 100 Fifth Ave., New York, N. Y. Please rush your book in colors, ‘‘How to Learn to Play Tenor Banjo,”’ my First Free Lesson, ai! reser e a gift sis been said to be the greatest full tone, professional size Tenor Banjo for me ob! discovery for the teaching of gates me in no way whatever. music, and it is being used with our permission by several Ee eee oe 2 ene musical schools throughout the country. a New York Academy of Music: .., wet ea Studio 16—100Fifth Ave: ah ticiete . New York-N™ 3

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POPULAR MECHANICS ADVERTISING SECTION V1 TrainYouto?int \V6 Jobs Tike ‘These | Te ACYd pectin

(

Here's the biggest offer yet —So big that I can't explain it allon this page. You don’t know what guarantees are—You don’t know what wonderful things I do for my students —and what I guarantee to do for you—’till you get my book ‘*The Vital Facts.”’ Send forit now. Get the details of my 16 smashing world beating guarantees.

VEN ordinary electricians are earnin , $10 to $12 a day and thousands of big ee - ~ po jobs paying $70 to $200 a week are go- John Jirinee, 1133 Fourth Ave. Ast ing begging for want of trained men business toe ‘himacll. He says Con to fill them. Electrical Experts “""7ooeb' {or us sccm (trained men) are needed reef Verywhere now. Electric- >», ity—the fastest grow- ' ing industry and best paying pro- SSS roe in — the world— NEEDS YOU. I will train you right in your own home—in your spare time. Get the details of my training and my 16 smashing guarantees. Cooke Trained Men Most Successful In my training you get my own 20 years of experience as an engineer; the knowledge and experience of 50 other noted engi- neers and the full time and services of 10 college trained and practieal engineers who I employ to assist me in the work of training my students. Cooke Trained Men easily get the big jobs in electricity because employers know me—They know the value of my training and the reputation of the big two million dollar institution behind me. Go Into Business My Training Pays With My Money Its Own Way

Auto Electricity Pays Big W.E. Pence, Albany, Oregon, specia Electricity and i $750.00 formerly a mechanic earning $3(

Gy ~~~ +

. = Most of my students make many “eae g j rery t ve tw ’ . ons / Every month I give two of my times the monthly payments for Big Money in Electrica students $500 in cash to go my training in spare-time work. Construction into business for themselves Beginning with your 6th lesson I A. F. Kiemz, 4449 Kerwin Det: t, Michigan als rork 5 i lectrica struc J y this e It’s give you special spare-time work earns over $5000 a year in Elect No strings to this offer ee instruction. You earn while you tion work. He formerly earned an outright gift—all explained $5 a day.

learn. My training is not an in my book. expense—it pays its own way. Getthe Facts—WriteMe Now The coupon will bring you the big story of the opportunities for you in Electricity. Don’t decide on any training till you get my book Learn how hun- * Bi dreds of other men get into the ar 0 y ig big-pay class. Get my 16 smashing Guarantees. Mail coupon NOW! FREE OUTFIT |i v. cooKe, chiet Engineer 5 Wi PREE a whole set ot | CHICAGO ENGINEERING WORKS

tools and measuring in- struments and complete outfits of experimental, | Dept. 1-A,2150 Lawrence Ave. a . electric lighting and elec- Chicago IIlinois ’ tric power apparatus.

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POPULAR MECHANICS ADVERTISING SECTION 33 Classified Advertisements WORLD'S BEST WANT AD MEDIUM

Advertisements in this section, 25 cents per word, each insertion, minimum 10 words, payable in advance. To be inserted under proper classification in July issue, copy should be in our office May 18th.

ADVERTISING AGENCIES TO e agents or salesmen or for selling far reaching investors, use classified wa is in largest newspapers and maga- e Price list No. 30 sent free. Ankrum sdvert ¢ Agency, 20 W. Jackson Bivd., oO Ill. The largest classified advertis- j in the U. § a ‘TISE in 24 Big Sunday Newspa- vords $15.00. Catalog listing 1,000 Dailies, Weeklies, Magazines 4c nion Advertising, Baltimore Bidg.,

\l RTISING in all magazines and news} s at publisher's lowest rates Rate book free Taylor's Advertising Service, Dept | Freeport, Ill WORDS—355 Rural Weektic $14.20 Ad- Me Agency 4112-M Hartford, 8&t L Es ee aes VERTISE, hundred magazines, three issue word Pennell, Covington, Ky 25 WORDS, 75 Country Town Newspapers $3.40 Shaw, 221A Northeast, Wash- s DD. ©

FOR ADVERTISERS | WRITE letters, folders, booklets, com- t wup for manufacturers, mail order Long experience Write for de- L. Taylor, Box M44, Freeport. I! E 25 words 75 magazines

$ One salesman made $167.00 from $ Why not you’ John R’’ Ad- vert 6553 Woodward. Detroit 2 VORDS 88 magazines $1.00; thrice $2 Smith’s Service, 1194 Wenatchee Wa COMBINATION Winner 1235 Magazines Thr 10e word, $8 00 inch Interstate { Munising, Mich INCH Display—100 monthlies and week combined $12 Cope Agency, P. Champaign, Il CIRCULARIZE guaranteed lists Agents’

$5.00. 1.000 Pennell. Covington. Ky SALES PROMOTION $ £50,000 Daily Sales developed during s for clients by my direct-mail plans, y ipaigns A $25,000 annual volume reased ten-fold in twelve months An-

othe fram an initial expenditure of 20 leveloped in four years sales by mail of half lion yearly Ten years Sales Pro- tion Manager Larkin Co Submit sales pr for Free diagnosis James C. Jot 11 SA Woodbridge Ave., Buffalo QUEX Letters Get More Business. Write tod Quex, 4418 Michigan Ave., Chi-

AUTOMOBILE SUPPLIES CARBURETORS: Save 20% to40%. Your

uretor made like new Guaranteed ed on new carburetors by tra ling old one Loftus Carburetor Co., 7 M idison St Chicago, Ill All SWITCH: Combination § air-gauge inflater; pocket size; sample $2.00; S ll dial air-gauges; 12,000 feet of t h braided rubber tubing: 1.600 valve connections: a bargain Judd BE. Hammond, Munday. Texas \ REAL gasoline saver for Dodge cars, wer, speedy acce'eration Write to- it free Schrieber’s Automobile Nashville, Ill ‘OMOBILE and Truck Parts at a sav- ou of from 35 to 75% off the fac- t prices, on Reclaimed parts for ‘ll makes and models, from 1914 to State parts wanted, and send for rts list on your make of cars “The stock of Reclaimed parts under one Send us your parts orders Auto ( Boyle & Panin. St. Louis. Mo USED Parts for Dodge Brothers Cars 50 from Factory List Price. All Parts teed A No. 1 Condition Harris Car Comnany. Cane Girardeau, Mo ! B. S. RIM Compound prevents tires king to rims, stops creeping and over- makes tires last longer Also pre- ust. Two years’ supply $1.00 postpaid. free mS B. Scott Mfg. Co., Dept. ' eport, »

CHEAPER Gasol ine Satisfaction or money

Ford Spec i alties s or —¥ Baudin, Havre. CLOSE Tite your

MILLERITE-ETHYL-Super-Fuel Increases Power and Mile- simple Formula and High Class Automobile Specialties described the valuable literature I'll Everything for the ’ fe are the largest car

We refund your money AU TO Trailer = 00,

Pump costing $2.50 will

charges dead battery Oakland, Overland, Oldsmobile,

LE SUPPLIE s, ACCESSORIES AND HOUSEH

OLD ECIALTIES WANTED. PENNSYLVANIA Distributor reaching more than one million automobile owners will consider meritorious automobile sup- plies and accessories If you desire such representation submit description, sample and bed-rock prices James C. Johnsor 18B Woodbridge Ave., Buffalo. AUTOMOBILES

PATENTS Time counts in applying for patents Den't risk delay in protecting your ideas Send sketch or model for instru tions or write for Free book, ““How to Ob tain a Patent’ and ‘‘Record of Inventior form No charge for information on how to proceed Communications strictly confi dential Prompt, careful, efficient service Clarence A. O'Brien, Registered Patent At- torney, 5892 Security Bank Building (di rectly across street from Patent Office Washington, D. C See pages 154 and 15 CANADA, British, and France patented; I S. pending; guaranteed Automobile ix nition lock, Thief-proof. A... W. Mabbutt Kenilworth, Utah $500.00 TO $500 00- ~ profit, monthly in One Day Battery Service Easy monthly payments allowed Hobburts brings particu- lars without obligation. Hobburts, Troy, Ohio DYKE’S Automobile Encyclopedia Lith edition, new, greater than ever, entirely re- written and rearranged Contains greatest array of automobile facts ever published in one volume Separate books cc ntaining same information cost $21 Over 1,200 pages and 4,100 illus. Cloth $¢ Flex. Amer. Mori co $7.50 postpaid Send no money Sim write a postal, if you liy e in the U. 8&., say ing you want ‘‘Dykes When the postman hands you the bo give him the price plus the few cents postage Popular Mechanics Press, 20) E. Ontario St., Room 806, Chi Ti

AUTOMOBILE Owner's Handbook « taining 286 ideas for making your car longer lived and more comfortable Also tells how to make emergency repairs on the road. 2 illustrations 50 cents You should al! ive Automobile Tourist’s Handbook which is dozens of ideas on auto camping and juning. 50 cents soth books for $1 Popular Mechanics Press, Room 806, Popular Mechanics Building, Chicago, Tl FOR FORD OWNERS WARM gasoline improves ignition and saves fuel Uniform gasoline pressure t carburetor at all times—no grades too steep Install the famous Auxiliary Gasoline 8 tem. Better than a Vacuum at a mere fra tion of the cost Nothing to get out of rder and will last as long as your Ford ns Send $3.50 for outfit complete prepai Absolute and positive guarantee 4A Pro ucts Company, Mfrs., Department A, Den ver, Colo FORD Necessities Visible oil pum; $3.00; Water pump. $4.50; Hartford Shock absorbers, $25.00; all carburetors and igni tion systems E ything fits; no drilling C. Loftus 847 Madison St.. Chicago, Ill TIGHT Valves Save Gas Our outfit iy

cludes Instructions Grinding Compound and Tool. Nothing else to buy. $1.00 Mailed Anywhere Vaclift Valve Grinder (< Minterbrook, Wash FORD Sedan beds, Two-door $7.00, Tudor $9.00 Milligan and Chrey, Bremertor Wash HOW to rewind Ford armatures, $1.00 Kelsie Click, Mt. Vernon, Ohio THE best Timer for your Ford, price $1.50. Guaranteed one year. Agents want- ed Hy-Power Manufacturing Corporation, Dept. C. Mt. Vernon Y UNDERSLING with “RKO” Swing Le Irons. See ‘‘Red-i-Kut"’’ ad page 146 FORD sport, speed bodies and specialties See Ad. page 150 ONE Day Battery Service pays big in smaller Shops Only $16.50 monthly Ho- hartseo brings particulars Hebartsco, Troy, Ohi

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34 POPULAR MECHANICS ADVERTISING SECTION 2% MORE volts than ar rdinary Ford AIRPLANI rs, New 4-B YUCATIONAL books and cort @ Timer. More power, more pet etter pi ixteen-i liameter Au , in br “a P ul nd instant starting. Wipe Timer B i t i t t Air t f Cour ! I r er ir I j 1 Ford T new for Ex t \ We 24d S N Ss I rs Positi ing yor r and 1 PRACTICAL Psyct gy T t ‘ k—use r or h $ ) 1 ) tisr I t M etist Ma greas¢ Highe r r or i Wri for ir le I ing, A s Cure H r ‘ t r th i H J Air r 1 Su Co ase i I Send r B keep spark plugs clear | i t ! ) n, O ‘ Fernando, D ) r 1 tr é epaid f NEW Alt rs f \er i \ f I lar r r e toda ¢ »: Tact t ) s Tr \ Pr ( D t Air Ss $4 \ \ r | i regar \. Denver. ¢ i é ‘ Interna il manu Catalogue free. Cor FORD Part Save f t f \ t 20 M S Balt M invited J Knapp Reeve (f e factory list eed R EN Tt Ed r), 5 Alexander Bldg rf Ford Parts. Re 1 Ford Motor, 8 : i ' or na. Sopee ! INDUSTRIAL Alcol Ww : ‘ . rf $ Full dir ns for 1 Ir i é s America ift f s & Chamber! »PM I r \ i ( fl ‘ Str N Yor — = | Sr NI Wor i ‘ : FREE—Send for Newtt MILES ( W I H \ ne ¢ ‘ I tur oO t. M nd & ak \ H f f i FOR Sa ! R Mo l " Mart P i r, B ‘ ( "v AJ Whe I r 0 ~ ri D ' I I —_ SMALL M r KARN §$ $ ) I NATI V tes the 1 \ \ \ } N si ig} ‘ ‘ I ( for \ I Air I aura R Ford Mal D 1 | Write for f Western Airplane | derful ‘Oy M a > er j \ k Write for ‘ D M 1 B i Cur ( me inf i x ir Au ‘ i inteed 27 x mat I r ( ( 1. K NEW 1 inder Gnome aeroplane « M. Ste MOTORCYCLES, BICYCLES AND | While the i $4 ) ea rhe HYPNOTISM ea earned SUPPLIES Sales Corporation, Alexandria, Va | guaranteed. Postpaid $1.10. 8S: SEND for , @ 1 sulle and OX5 CURTISS § al Two-Seater, $500 2 = > = neld._M M Savi Mi . , ~ . Lis ane wit! t r $250 \ RI} W n Mot vele S Car Motor 1 Se Lig Biplat ( t r s W Repair Parts and A rie Some I _— slueptints, |S , : : 1 parts than half. Cleveland and | M e Blue $2.50. Propeller ' The P Ace M es our specialty. S$ i; ! rs S10. | g Instr New ¥ \ W n pa American Motor ( le ¢ . Avi t . .* La , > : 4 w oO Awa ‘ . K (“URIOUS Book I jue N LEARN to Fly Now at Chicago's big new t Pictures Sa , ; MEN'S 3, girls bi $10; Racer Mur \irport t urse ir Li 14 W ith Str New ¥ $20 lar $25 McD ald 17 W Wir Lake, Chicago vais = : 7 on eee eee ee ee PICTURES AND POSTCARDS OVERSTOCKED—200 Used Motorcycles for a pilot ‘ 1 guarantee to JOIN Popular Friendship ¢ Must be sold at e. We have Harley-Da 1 é rt Aviator. Spring classe Exchange ¥ post fsor India Hender ; Excelsior now formir rst ass April fir get ir Er Cleveland Write for ir Bargain List. | eat Write for folder Chicago Aviatior t nating sti ° Ye Myerow Brothers, Dept. B, 15 Berkeley St., | ©o.. I1811F Stevens Bldg., 17 N. State St ‘ Oc. three 1 Bost Ma } Chi 1 r 22 HARLEY-DAVIDSONS, § ; 192 | AVIATION Fa Send e dollar oe | Ol ( ( eld $ 19°20. $8 19 ¢ 19 ¢ ) beautiful pair erling g I nte | , . . b eae 1R I } ' $ $4) 14 : teed or r n \ safety lentifi ms $ 9 . 914, $ Guar om Ee fi a Bay inca S} P ‘ I R fone we , i tisfled Cir r | " i f Na ia as free. Wi in Cycle les ¢ 726 Na t Thousands being pilots, avi t 1 Ave Milw r W r har i enthusiasts ALASKA | tea i e Aero ( rf, Iowa grat e assorted ON’T buy Motor A ct t i d i \ I ‘ : eee om ai ui sehen HE American Sel f Aviation an- | 1941 Anchorage. A has, \ r ers, § i i 7 ‘ . eats ; cin, t OCR M acs Shaw Mfg. ¢ best 37. Sinton \ , f Avia Qt A thorou h tr . 10 ‘im ™ r | i ra ! i ror rl r | » a. Scho of tior ep 61 601 J hi | 4 vIra«@ , 2 EW and used parts for Motor and CS a a oo —— Oe ANGE! , Ricyele Get prices parts needed. | Ave \ t 2 B s I \ Kingshighway Motor ¢ 1166 N. King COMPLETE Scale Plans, with ART P i 2 hw St. Lou M : r Instructior Ry rf a a S Pp ( Isa R SEN har i et \er ines ic each postpai \ no a A ae Havilland; N.C.-4; Curtiss Tracto es at low rf Used | Nieuport or Taube Monoplane PAGI part f-pri e Ast Motor ¢ rat aes sg a cR tog I H Aer ine ( 651 Spring Street ; ¢ is D> ( USED : for ! eap Yor , | rRUE-BLU! ( I tate ant Schuck ¢ e ( 1922 West a - : ~ | Excha urd ke. Seattle Wael FREI I ing wel r Ou ‘ Elr WV INDIAN Prince $150: 1 ile WW ‘y ie JOIN Li Po i W. Lewis, 6801 ‘‘J,”" Houston, Tex Sper Write for our folder. Chicago | lists i ling ¢ li Avi ym ¢ any E Auditorium Build I) Ind AVIATION Fag ey 1-4 AUTIFUL Art P | > = = aoe - : | ing ies 2 Pr s MOTORS Curti OXX-6 Class A iW LI ARN A taul J w L068 Var- | 6977 wree. Suite i. Chiea ler Fifty Hours) for Plane. Sea-Sled, M nev Aircraft Co.. Peoria. 1 . . - tor boat, et $140. 0 All Motor i Plane LEARN Aviation; write for formatior GAMES, ENTERTAINMENTS AND Spares at Best Prices Send for Catalogue. | Am-Rhein Aviation Co 120 Colle St PLAYS Monumental Airct Co., 9 N. St. Paul | Peoria, I VENTRILOQUISM h Place ltimore, Md AIRPLANES. propeller eather its. | at } Sma t. Send FLYING Instructior Pr t Piersol- | New 28 hp. motors $1.25 Weigh 1535 1 for articular i proof. G Ww. 8 Veave Air Ss e Corporation, Kalamazo | Good for igt t irshi Smith Ma- | Ro S-4 25 N Te Ave Miet | nery P. O. Rox Ho t Tex I SEND 10c for our latest aeronautical cata BOOKS AND PERIODICALS PLAY Pola he fascit 5 z i ng ete line f rplane g , — ! t of the — ogy ig Ba ve. Bigg enh HANDICRAFT Magazine tells “How to | 1.90 complete. The Polaris ¢ Ford Air Airplane . M ike ; I ini Copy ) Prit N Yor \ t Ww ingt ) ur 1 ea € $2.90 : : | POPULAR MECHANICS ne Heath Airplane HYPNOTISM wins your wi ‘ | Book Catalog lists books of « BUILD Your 1e—America’s | A™muse Astound Pa 25 Es \ y is free. Add itest ht Sy mate | r oi.t ! il | \ t s Pre R 8 ) lig t aterial and | Wonderful! ) DP a! nr Saas , » I jue prints now lers Write | ,") 1518 North Gr a . | u sUGINE _nicag . for parti ilar lard Aircraft A c - = eatin | MAGIC TRICKS, BOOKS AND JOKER Cor Lin - WRITE “a y _ ) ice n agazines NOVELTIES WANTED to trade Automobile for Air- | hse = - | 2D Mysteries’ 10c: New B mane Box 52. Danville, I KNOW thyself and friends; astr gical | CARI ysterie 0c; New Bo le eations birt! It t t il ! Am n I PATENTS. Time count BB > mgt ~~ Ag Sgt a les rege —"'s iM patent _ Don’t risk delay - = = =e = y : Appar Im Puzz! ideas Send sketch or m | KNO \ How tea Jokes—Pocket Tri or write for Free book Secret Word and the ding Eft ~ Patent’’ and “Record of tune,"” by Adar $ ies included No charge for information on how to pro- trated catalogue o S Both for i ceed Communications strictly confidentia ; ¢t Realize Any Desir I Douglas Prompt, careful, efficient service. Clarence | 1646 West Ohi A. O’Brien, Registered Patent Attorne $2,000 YEARLY } FUN! } 5892 Security Bank Building lirectly acro local tion of r pocket ertie : street from Patent Office), Washington, D. ¢ s t and detail 2 Send for e ! see pages 154 and 15 ( Quir Ma oO Gand Cristield, Md

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WAGIC POPULAR icks, Books and Supplies ell as the great professionals irn through our instructions \ n Mind Reading, Spiritualism, Large illustrated Profession- Chicago Magie Co.. 140 8 Dept. I. Chieago. Il Mysteries, Magical Nov- e Particulars Free Singer, Wi ‘ ng Cards For l0c a set B. Zitka, is cards for 2 “ Louisville $25 order talogue of Oaks 0 Wis. : \ gical Delusions and Catalogs— ( o, Morgan Park, Ill SCENERY TO RENT books, stamp. Cc novelties, Fenner, £ die box Send tricks, wigs, Magical 20¢ sen- Dept vi

for Opera, Plays, Minstrels Address Amelia Grain, Phila-

STAMP COLLECTING

NCHER’S FAMOUS re OPULLAR Packets—Frow Countries you ir Album These are selected est packet list ever offered the ector. Hundreds more equally low priced No. 60, 150 all 279 5 diff.. Egypt, 30¢, No Madagascar, ie, No. 297, Re- ff., 50e, No. 152, Europe, 100 No. 3 Ireland, 10 diff., 10c, r, 25 diff., 50c, No. 278, Dutch l0c, No. 15, 300, all diff., all diff., $1 25, No. 248, diff. countries, 25c, No iff.. $5.00, No. 223, 100 Africa . No. 161, 100 Mexico, 211, Honduras, all diff., 100 Portuguese Colonies, all Every one of these packets bears ild guarantee, which means that in every Scott packet is not only listed in Scott’s Stamp Cata- Seald packets contain no post ts, cut squares, foreign rev- egraphs such as are commonly kets of uncertain origin. If not epresented we, or any of our make good. Write for the Free e list of bargains in Scott Seald 1s, sets and accessories Scott are sold at your stamp deal- e, Seott Stamp and Coin Co., Street, New York, N. Y¥ . cent Approvals I , 1117 So. 60th in St., America. Philadel- iR ' Stamp ) Collection— -70 70 different foreign \frica, Asia, Australia, Europe, Our pamphlet which tells ike a collection properly,’’ and albums, packets and sets all for ts. Queen City Stamp Co., Room Kace St., Cincinnati, Ohio MIXED Stamps from 40 different Australia, North, Central, and America, Russia, Africa, China Japan, French, Colonies, War issues, ete. tamp hinges, pocket approval book. ration gauge, and 3 United States ps issued before 1870, all for 25c. Big- bargain ever offered Satisfaction ed or money back Hussman Stamp Dept. P. ML, St. Louis, Mo $$$ Outfit—only 12 stamp; set German stamps var) value forty million dollars perforation gauge, mme._ scale; im; 2 approval sheets; airmail set; mp from smallest republic on earth; iper set; packet good stamps from Johore, Dutch Indies, ete. Entire for 12e to approval applicants! (Nice tock book, value 25c, with every \ncher Stamp Co., 148% Clerk St., t a ~ different countries, ! Fine with (inter- neore tf YSTIC’S Packet! Con- lands of cannibals, ens, sun worshipers, and wild savages. ire Kenya and Uganda, Persia, tch Indies, Gold Coast, Federated States, Abyssinia, Nyassa, Travan- m, Congo, ete. This wonderful ntaining 105 all different (mostly r only 8 cents to approval appli- a. stic Stamp Co., Dept. 8, Camden, ss, Mysterious’ . from the a ed) f Fenway Outfit_— 2 triangle mall album, 5 blank approval 250 hinges, perforation gauge, 5 large " Colonials, 2 special deliveries, ani- et, red cross set, packet 55 different, in- & Abyssinia, Azores, Cape of Good Bosnia, Crete, Congo, etc., 16-page ii all for 12ce to new approval appli- Fenway Stamp Co., 161 Massachusetts Boston, Mass.

SM SS oS eeeess, Sree, MECHANICS ADVERTISING COLLECTORS! I'm giving away, without a penny’s cost, thousands of beautiful and valuable stamps every day Are you getting yours?’ <A card will bring you full partic- ulars of the most sensational free offer ever made Argenbright, Staunton, Va STAMPS sent on approval at 70% dis- count. Reference required. Emory Renoll, Hanover, Pa. STAMPS Free—Ask for money-saving ap- provals. John P. Borresen, Cedar Falls, Ia.

CURIOSITY Packet, 104 unused in blocks 12c. Big 20-page List, set Air Mails Free Rueger, 31 Cambridge, Dayton, Ohio HONEST prices paid for stamps Spot Cash 1889 Albany Ave., International, Brooklyn, N. Y FREE—50 Different applicants sending Neumann, Box 8953, “UBRRAINE” — the country with thrills than the jungles of Africa. different scarce big picture stamps cents only to approval applicants Buck- nam, 63 Court St., Room 1, Boston, Mass TEN Large Showy Stamps Free; Also list of sets; Postage 2c. We buy Stamp Collec- tions Payn Stamp Co., 945 Vista Drive, Los Angeles, Calif. _ FREE! Fine set Azerbaijan to applicants. Penna Stamp Co., Manor, Pa FREE 48 different with approvals. Bay State Stamp Co., 461 Moody, Lowell, Mass FREE, Hungary Charity No. 565 to 567 and a surprise packet given those re- questing for my 1, 2 and 3c approvals and also my 50% discount and better. Chas. W. Schmidt, 3227 Benner St., Wissinoming, Philadelphia, Pa. _ $1.00 WORTH of Stamps 12 West 101st, New York. APPROVAL sheet Catalogue lowa Stamp Co., Cedar Rapids, Towa 300, ALL Different, good stamps, 25c to approval applicants. Neumann, Box 893, Houston, Texas _——_ 500 MIXED U. 8. old Weatherby. Medina, Ohio STAMPS! Big Bargains! 50 diff. Ny- assa, Fiume triangle, etc and Perf. gauge only 5c; 15 Uruguay 12c; 8 Nyassa, beauties, Sc; 25 French Cols. 10c; 50 Br. Cols. 1c; 40 Africa 12c; 10 Iceland l2c; 500 diff foreign 30c; 1,000 diff. $1. All above, cataloging about $50, only $1.70. My choice 50% approvals with all orders List free! L. B. Dover, Clayton, Mo 500 MIXED U. 8S. and Lle R. H. Cariton, 366 Salt Lake. Utah SPECIAL Packet of Europe, consisting of 100 stamps selected from this continent alone. This packet is made up to sell at 2/« It is offered at only 10c to applicants for our approvals Edgewood Stamp Company, Milford. Conn i“ PENNY Approvals That berg. Box 5441, Philadelphia 1,000 DIFFERENT Stamps, 2.00. Martel, 306 Canada COVERTCO Packet and used stamps 15 39 State. Rochester, FOR Sale—To almost given away—Collec- tion of rare old stamps and Confederate Stamps that are hard to get now Will send to 9° 2 Stamps reference and Houston, Texas approval postage more 24 all for eight approval to for 3c. Hull, .78, Ide. and new, lc. Foreign W. So stamps Temple, Satisfy Pa $1.00; 1,500 Station ‘‘C,’’ Montreal, Gron- 250 cents. N. ¥ unused Stamp, varieties Covert on for examination. 8S. A. Robinson, Or- lando, Fla 300 DIFFERE NT $.2 500, $.50: 1,000 $1.00; 2.000, $4.00. Fred Onken, 630 79th Street, ‘Brooklyn. i COLLECTING Stamps? Start now. Bar- gains on Approvals. Schmidt & Wallace, 124 Glenn Ave., Fresno, Calif.

TEN Large Showy Stamps Free; Also list of sets; Postage 2c fe buy Stamp Collec- tions Payn Stamp Co., 945 Vista Drive, Los Angeles, Calif. FINE Approval stamps. All countries classified. Lester Niven, 1013 20th S&t., South Bend, Ind 15,000 DIFFERE NT | stamps to sell by ap- proval sheets; 75% discount. L. C. Vinet, 329 Laurier, East, Montreal, Canada FREE exchange service, Ten Mint Issues six cents. Elkowis Exchange, Elkhorn, Wis 24 VARIETIES Cuban stamps, 10 cents List of 6,000 low-priced stamps free. Ad- Gress Chambers Stamp Co., 111P, Nassau St.. New York City N.Y cm ae STAMPS, 100 all different Postage Lists free. P. M. Quaker Stamp Toledo oO FREE— 50 varieties to approval applicants

sending 2c. Richard P. Lamprecht, Valpa- raiso, Ind <= FOREIGN Stamp Free. Colleaties Sent | Cornish Co., Schenectady, N. Y. SECTION 35 FREE! Loose Leaf Postage Stamp Album at rate of 8 pages each month given with sub- scription to monthly Journal. Send 2¢ stamp for prospectus United Stamp Co., Mar- quette Bidg., Chicago, I 50 «varieties, Mexico, etc., 1,000 mixed, Africa, Brazii, 10¢ 50 different ‘ 40c; 1,000 hinges 10e List free Cc, Stegman, 59418 Cote Brilliante. St. Louis. Me ZAMBESIA, Zanzibar, govina, Allenstein stamps, tion, album, 10c. Liberty, Louis, M PACKET of 253 5 alike Packet U. 8. Rev., Co., Toledo, Ohio. BIG Variety Packet for 2c postage. Gra tion E10. Toront FRENCH

Abyssinia, Herze- menagerie collec- 3974 Arsenal, St twe countries of $1 and $2 Miami Stamp

r et M. Foreign Stamps Free 2y Stamp Company, Sta- anada. = : Colonies Free.—Pretty Picture Set, Native Chiefs, Tigers, 2e Postage Empire Stamp Company, 342 Lippincott, Toronto, Canada DANZIG Free— with Biggest Lists land Stamp Co

Nice Set Danzig Stamps issued 2c postage. Mid- Station E2 is Toronto, Canada 20 UNUSED stamps free P.M All differe: Postage, 2c. Fisk Stamp Co., Toled Ohio SPECIAL—1000 Ask for approvals and yeceive gift. C Hollister, Mukwonago y ¥ STAMPS on approval—e yromtum. Herbert Keigwin, “$l 00 H different . stamps Free Middletown, 5 PRECANCELS Precancel Partner,’’ cants. Badger’s and copy ‘‘Badger's 4c to_approval appli- Partner, Brooksville, Fla FIVE unused sets, including ‘“‘War Pris- oners,”’ Airmail, Eagles, Dues, Pictures; 5 French, 5 British, 5 Portuguese Colonie 4 Salvador, including triangle; 100 diferent

only l5e to approval applicants. Deering 47 Newton, Marlborough, Mass FREE—25 Portuguese Colonials with fine approval sheets, Lightbown’s Stamp Co Station F, Toronto, Canada 5 AIRMAIL—20 unused 4c. 1,000 dif- ferent 98c, 500 different 38. Both $1.25 Ruckey, 712 Bowen, Dayton, Ohio 110 DIFFERENT Stamps, many unused high values, free to collectors requesting our Net Approvals Postage 2 cents. Christ- ensen. Milwaukee, Wis 1.000 U. 8S. AND Foreign Stamps 2%« Phil. Lundsted. Cape Cottage, Maine $1.00 REDUCED to 6c. 100 all diff. un- used genuine stamps from Georgia, Vene zuela, Poland, Turkey, San Marino, etc worth $1—with 250 hinges, big bargain lists all for only 6e to new applicants for our approvals Victoria Stamp Co., London Canada FREE— a special set of stamps those requesting net approval; de Jong, 539 West 162

required ee

PREMIUM to net approval _ ~ sending i Tower Stamp Co., 42 Westvi lle D rehester, Mass 110 NEW Europe, All Different, a won- derful collection cataloguing several dollars free to collectors requesting our Net Ap- provals Postage 2 cents. Badger Stamp Co., Milwaukee. Wis 100 DIFFERENT stamps free to appli eants for low-priced approvals Westland Stamp Co.. 70 Westland Ave., Boston, Mass FREE—Set Irish Stamps, pogmseme, ete., for 2c stamp. 100 diff. U. § 25 Bul- garia 9c; 1,000 hinges 9c: 30 “Finland 9c; 500 diff. 45¢ Hawkeye Stamp Co., Cedar Rapids. 29. Towa RARE COINS U. 8S. INDIAN White Cent, with price list 10¢ Fred Greenclay, Box 1715, Tellu ride, Colo 50 OLD coin all different, $1.00 Monroe Half Dolls uncirculated Hie List free. Claud Benaw, Box 315, Dallas, exas SPECIAL Offer: United States Old Coins. Every one in good condition Half Cent, Large Cent, White Cent, Flying Eagle Cent, 2e Bronze, 3c Nickel, 3c Silver, Half Dime, Bust Type Dime. 20¢ Silver, Bust Type Quarter, all for $2.00 Postpaid. Large Cent and Bargain Price List 1v« M. Arcy, Box 13. Muskogee. Okla SELL European Bonds, Money, Coins, by mail, and agents Tremendous Profits! Circulars free $1.00 brings big bundle samples, everything. Hirschex, 70 Wall St., New York GERMAN 5,000,000 Mark bond 25. 100 assorted German Reichsbanknotes, excellent value, $1.00. Weiss, Box 3049, Memphis, Tenn.

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36 POPULAR MECHANICS ADVERTISING SECTION

OLD Money Wanted We nid $2 ).00 VELOX G y Pris Don’t confound ROPP’S s for né ilver lollar t Mr Manr if with those mad r hea paper ) cent \ i ‘ Albany, N. Y We buy all rare ir ind for developir exposure fo 2x3! ir M pay highest cash premi Ser lc fo i rints ents 2% or 3%4x4% t large ¢ Cir r. Ma ean mu r 10 for Vest Pocket or Postcard siz r factor Pri to y Numi ic B Dept. H, For Twelve exposures Doubl price W L $1 Desk siz yt ; S Worth. Tex Champli & Son, 6950 S. Carpenter St No Mor Si y rit . T cn » - posta if ) i i the I ws THREE Foreign Coir \ Spri Sell- : ; : , ing Catalogue 10c. B. Gabe Smith, Forne KODAKERS, Get Busy. | Send quarter man sends you t Texa with roll or pack for trial order S. Harter pri I t f 114 Tth Avenue rerre ite y Mect i Pr 4 I Onta ~ ‘ 10 CONFEDERATE bill z Thu ue . Ha L ‘ i I . 21 00 Leases foreian bil he R BETTER Phot Finishing Send one : Coir 10 J ee Sees Se roll film and 15e for trial offer. Moore’s WORLD-R 3 M i irge Copper ¢ 3 Phot S io Alst } N H | langu Pr $ ) \ Forei r 65c; 10 Austrian bills 25; . ~ Ar Chi D > ne ution we bills 30¢; Large | wolid 5 MOTION PICTURES | Ger eek, Hir edal $ ) Mexican bills 20 gy, SP ore a t 8th. Philadelphia, Pa NEW $ Sept Movie ¢ era 37 ed r s I s s - - $50 ) foot Movie Camera $40—Printe aamnen . ANCIENT Roman coin, 1.600 year , : af Mov ; t . + xc. Durso, 25 Mulberry, N. Y. ¢ + a a Fimnrogg® -y- New York = r driver $ é "rose r $37 ) —— = UNITED STATES and Foreign Money 800 foot Fil ‘ Comedic e>, cal rYPEWRITING Meda Catalogue and Villa Bill 10 cents ) $10—P t > 7 inu ia i \ Drama I ion I $100 I : Alexis _Mengelle, Colorado Springs, Colo tented. Ra 1 Sth Ave., New ¥ prantord._' FLYING Eagle cent and price list 10 MOVII 1.000 ft. r { . RAILROAD P Jose Bi 140 19th Street, W é ric $2 é hi here ntl ra i S York, N. J i fr ' witl ik I = ‘ 1 I 2 OLD Coins, Large Spring Selling catal pendent Fi 177 Golden G \ s aS Ge f coir r sale free Catalogue qu Frat Calif EARN $25 t prices paid for coins, ten cent Willis BIG Mor Nightly—Good ~ leon , Hesslein, 101A Tremont Street, Bostor plete O installment 1 s ss i S1-A, St. I M Ma lid H e O t, $25.00 G Movie Ca i KI R Pp ; 2 TO $500 Each paid for hundreds of wore Ralph J. Golsen, Dept. M ceggeone 1. “ee Old or Odd Coins Keep all Old Money; 8 Argyle S (hileag ' NY sits it may be very valuable Send 10 cents for FILM—Million Feet for Sale ( USED I — 1 x 6. Get Yrama—Comedy and Feature Special Mix — fr Aient 3 a Clarke Coin Hart—Chaplir 1 best M tar , s —_—_— $3.00 per reel up. Ger List Fre We pe I s Fr t and Pleasu llecting Old | Supply the World. Der Monarch Fi anes Coin Send 10c for Sample Old Coin, to- Memphis, Tent LEARN Bri 5 gether with my Large Illustrated Coin Cat DON’T fail t i for the big Free [a | Bui - B s rg ; : “ alogue u'll be delighted with it Send Book of Cine i Apparatu The Cy t | , ~ ni ( r 7 R \ for it right now B. Max Mehl, Professional of M. P eras and Projector = : Numismatist, Mehl Bldg., Dept. P, Fort | the game t has made thousand USED ; : — Worth, Texas Largest Rare Coin Firm in dent Write r wire for your « Bass exchanged Hanfling, 799 B S ( era ( pany 105 N. Dearborn St | York oe CALIFORNIA gold, $% size, 27: $% | Chi Ill | noe a , A candy - ) t | r and size, 5 ee-cent-pi ind ca ( see POR ' rman Shultz, Col rado a a 1 is at non a ' new hed | , : Lee M . East ¢ FOR BOYS a a Scenari | ARTIFICIAL Marble sanitary fl — — pose = . i . struction rnamental RAT MOUTH-ORGAN Instructor, 25. Sixteen | Monica_and Western. Holl calle | plaster, papier-n lecor age Ry Fey selections. G EVERYTHING for ‘Movie Man” includ- | furniture tat R : Gree ing Fil Service, lowest price b | years’ instructi Dp par Orga ind Instruction Book Freé Gr rick,’’ Dept. P, Trenton, N. J. | 200 illustrati Chris M I 4 Klugt Ridgw Pa NEW 1 S M ’ ingtor N y Slot Sept wie Camera ¢ | BOYS Earn Big Mone Our free new Used, $50 ( I Ra 24 Fift \ | WHAT t r r Profit” f n ike it easy Write today Dept New York | News-N, Wa ton, D. ¢ ’ Arab Products, Niagar ‘all ; ’ : : igara Falls. NY. | “NEW and Rebuilt Machines for Big | DOUBLE B CAMERAS AND PHOTO SUPPLIES ae he Traveling | 60 hours with 8 Show Also Fil 1 Compl Internati 1 Book gz 1 PHOTOGRAPHIE » Theatre Equi ¢ gai List Free 8 Sopri ld, M ric f every des¢ il- Monarch Theat Supp ( Dept r ! vi ' YOU can have 1 busi lustr > 3 our I It Me his. Tenr j : .- all on on will pay you to secure a copy which is is- | MAKE money writing | la inalis | feca. A Gow aren of 6 ued free, as our prices are We a free to beginners. N rrespondence course. | readily learned by anyone deal in used goods whicl are id under the Producers League. 220 Wainwright, St. Louis. | few week Easy tert for tr same rantee as new wd k for our —— : ~ . | ings everywhere ith 1] e Bargain Book Central Camera Co Det ¢ 0 PROFIT night! Ss ll ca*ital ings Pa <— po By : : E-94. 112 S. Wabash Ave.. Chica Ul starts you experience needed Our sng ore ~ — ; — : machines are used and endorsed by govern- | Ou mo Sgenty & CAMERA Enthusiast Exchange pictur ment institution Catalog free Atlas M ; Stephenson Labor ry, 1 I I World-wide information, taking ~~ i —! Picture Company, 482 Morton Bldg ton. Mas é ngi pictures; interesting nd t Chicag : Metans piness. Wind eat dheut many néiel RADIO OUTFITS AND SUPPLIES lege Walter Johns Director, Wide EDUCATIONAL AND INSTRUCTION RADIO Receiving Set World Exchange Club, Box 243, Lakewood = ~~ ~ t amma on ) eat er SELF-INSTRUCTORS, complete, ea ~ ait _is inexpensive : : =— Spanish, Italian, French, Square Dancing, | ou! ir time. No expes BIG fone Saved on PI graphi Boxing, Baseball Pitching, Etiquette Vio- sary Ur ler tl r r Lense i Apparatu goods excl ged; li Piat Drums Accordior . instructior f r epairi lone Raiph J Golsen, 1128 Ocarina, Ukulele, Saxophone—22 “ ‘ radio r i and Argyle St., Chicago, Dept. P five. 97 G. Elsea, Bowling Ohi ne also HAVE You a Camera? Write for : es ee imple of our big magazine, showing Ww a, tg MB gam - oo gene Ry eases ER ve agg aye <—¥ ike better pictures and earn money co AR ge Sige lg a lg ne A ne age ieee American Photography, 116 Camera House, ae a on cows coe NB —- 5 ; , Reston 17. Masa funded Use it for secret conversatior sta Add t Radio 5 writing letters et Price fifty cents E St Dept F2s Neu r ( FILMS Developed Special Trial Offer H Arbuckle, 7701 Laumer Ave., Cleveland, BEFORI Any Kodak film developed 5c, prints 3 Ohio WI aed expert kr each Trial 6x10 Enlargement in handsome - " . ona , + &20 WwW folder 40 Overnight Service Roanoke LEARN Show Card and Sign Paintir : I _t : Photo Finishing Co., 209 Bell Ave., Roanoke Earn $10.00 to $20.00 daily after short COMPLETE Se P ' Va home _instructior Superior Sign School ‘ $8.00 ) : - - Dept. 508, 2139 S. Wabash, Chicag Mt he 4 G r SUPERIOR quality finishing Trial of- . — a ess : fer: Any size 6 exposure roll developed and | DECORATORS, Signists, Artists, Pres - printed, 25 cents One only 8x10 enlarge- | men T peat ns for mixing 21 beautiful : rO introdu yur $ IR ment unmounted from negative, 35 cents. | rs | ‘ine Arts Publishers, 203 5 ye tor we s OF Carkhuff Photo Finishing Co., 2129 W. Van College, Indianapolis, Ind } ceipt of thi ivertise t a Buren St., Chicago l = ; - Fully guaranteed ci r f — . = s I - - IF you know something about drafting or ; r rk Mf ‘ VW t MODERN Photography in all its branches engineering there’s a place for you in wa roe . _—- now taught by mail New Suecessfu the new ‘expert ” - of calculating ing mA. cn! Method Students earning $300.00 while ree _ . a QUEEN of ¢ 1 R s — — “ : Strengtl of teams irders and Machine ote learning Big opportunity Write for par- - ry modern Buildit $1.9 M Back G 0 ticulars «and unusual offer open for short : senmiie of éumevtent. r Agents w i time Dept. 1351, International Studi ' , ; ' . Thox Wa B Ss o . digg We show you how to Inc., 3601 Michigan Ave., Chicago ind command High Salar Yort SEND picture for enlargement on 4% | Lightning Method Publish- RADIOS; part Se inch Ivorette Medallion (colors $1.50 ers, Long Beach, Calif ! Ww or Black Studio, Los Angeles a et Ernest Poindexter. Evert M

1925 OLD Fisherman’s Caler Will KODAK Films-——Special trial ffer r help you Catch Fish Used by T inds GET Radio Se pat f next kodak film developed c—prints 2 Pri 2 } Mone back if Sell to fri is Ou ! each. Moser & Son, 1917 St. James Ave lissatisfied lar. Box 700, Higt profi Free talog I ( Cincinnati. und Station Ma s 2117 Lo = s

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Tybes, | graph } Gomoll, mek, §=SS5. ‘ POPULAR LES Distance with one tube nderstands our Simplified In- including Panel Layout and j Vesco Radio Co., Box 117-PM, \RN ney at home building Radios. , No extensive technical experi- Send for free booklet ‘“‘Radio } Guide,” with popular hook-ups and priced at wholesale Serlin Broadway, Detroit, Mich. Reecivers No. D-7-A_ with Speaker, Storage A Bat- B Batteries, Aerial, All new. Deposit $10.00, Van Bilaricom Co., Helena, FOREST Storage 9.50. C.0.D ES ew $3.00 value, all . postpaid. Ohio Radio Sales, « K Building, Cleveland, Ohio. _ VONSTRATORS, Radio, wanted, Ama- ssionals, see Radio Shack adver- ze 6. t iaranteed Tubes, $1.65 any type. 540 17th Street, Osh- Regular postpaid, Guaranteed De- Amplifier. Agents wanted for our et Send for our Money saver Kings Radio Sales, 1166 North vay, St. Louis, Mo. G fits recharging radio rie Outfit, easy payments. Oo $1.55 “and auto Hobbarts, TELEGRAPHY Wire- TELEGRAPHY—Both Morse and tau Tre- ght thoroughly and quickly Big salaries Wonder- Expenses low; chance School established fifty years Dodge’s Institute, H S8t., demand rtunities. earn part free rai Inc AGENCIES WANTED WILL be pleased to receive samples of rs | order novelties; also novelties for ertising purposes. E. Stewart, 110 Bath- Sydney, Australia. TRADE AND TECHNICAL SCHOOLS HICAGO Technical College offers short, practical courses in Drafting and ing—civil, mechanical, electrical, Architecture, Building, Construc- Reading, etc Courses fitted to No time wasted Instructors é Graduates in demand at big rie Opportunities for part-time work t lying Day and evening classes Enter any time. No special training required Low tuition is. Write for 52-page illustrated Book, describing opportunities open to tes Chicago Technical College, Tech. Building. Chicago. PAINTERS Wanted. Big shortage re. Enroll now and in a few weeks . 0 to $20.00 per day Practical n Sign Painting, Pictorial Paint- Painting, Decorating, Graining and and Paperhanging. Write for free ind special offer. Chicago Painting —_ A-935, 150 W. Austn Ave., U \O Matter What Trade you are interested can get help from Personal Advance- gazine, published by Popular Me- ni ind sent free to all who request it ip you decide upon a_ vocation. ir name and address on a postal ilar Mechanics Press, Room 806, r_ Mechanics Building, Chicago, I book tells how to learn Carpentry. inet making at home in spare time. “, Steuber School of Carpentry, 0. RE! \RN Bricklaying in a School run by ng Contractors. Cireular Free. As- ed Building Employers, 312 A. B. E. ng. Grand Rapids, Mich GET a Foreman’s Job in any trade. Train rself to earn more money. Become an ewert I Dian at on Dreve} Bldg., Blue Print Reader. pare time. My training will give yuu vent in a few weeks. Write now— me what trade you want—I will send pl ee. Carroll Rumsey, 165 Philadelphia, Pa. You can do it BUSINESS OPPORTUNITIES Gl NTS $11.80 daily in advance (send for ‘worn proof) Introducing New Insured Ho- te 17 styles, 35 colors, guaranteed seven New line now ready No capital experience required. You simply take order We deliver and collect (or you can “iver. suit yourself). Credit given Pay y Daily, monthly bonus besides We o samples. Spare time will do ae hee Textile Company, Station 2586, ati, Ohio. | MECHANICS ADVERTISING SECTION OPEN and Own a profitable store home town. We furnish everything Rate Ford Supplies and provide, free, a chain store system insuring your success. Large chain now operating Unequaled op- portunity if you are ambitious to go into business for yourself. You can start as low as $500 cash. Particulars free. See or write Mr. Cowell, 1438 So. Mich. Ave., Chicago, “THIS Means You.”’ Read Surety Service Company's Proposition! ‘‘Agents Wanted’’ Classification. SPARE-TIME Workers—67 plans with in- structions to make money in spare time Also 29 trade secrets, all for 25¢ Astrolite Company, Dept. 24, Sharpsburg, Pa I MADE $100,000 as Real Estate Special- ist. Free booklet tells how American in your in Cut- Business Builders, Inc., Dept. AA-446, 1133 Broadway, New York YOU Want a Big Money-making business of your own, a sure winner, write for infor- mation on how to make beautiful marble, onyx, agate and turquoise from common ce- ment Spencer Laboratories, 41201 South Main, Los Angeles. Calif b ’ G into the Mail Order business We furnish you with 1l6-page Jewelry Catalogs with your name printed on cover. We fur- nish you with merchandise, etc. Write for information. H. Reisman & Co., 551 W Lake, Dept. 23, Chicago. a START a Profitable Business at Home Men or Women Spare time or evenings 20 plans, many without soliciting or capital required. Particulars for stamp. Frank P Washburn, Business Counselor, 149 West 122d St., New York ae EASY Money! Silvering mirrors, Auto- parts, tableware on Pians Free. Sprinkle, Plater 12 Marion, Ind. FREE Book. Start your own little Mail Order business; home employment evenings. Beginner’s Outfit furnished, including 500 circulars, samples, things to sell; you deal with Manufacturers Also tell easy way to get Agents by mail to sell your novelties Instructive Book free Pier, 978 Cortland Street, New_York : IMPORT Your Own Goods. Big German Export Magazine printed English offers thousands bargains Products low priced, no competition Sample copy 50c. P. Abea Spe- clalty Co., 263 Fifth Ave.. New York THE Venture of a Century! $2.50 Buys 1,000,000-mark German government 1925 bond. Wanted, German bonds dated prier to 1920. All foreign bonds and currency dealt in. Frank O. Everett & Co., 35 Wall St., y York F ANCIAL success can “only be obtained in “the manufacturing business. It is easy We show you how, Trade and Professional list free. Lancos National, Syracuse, Y BEVERAGES Our Specialty; Everything; Syrups, Extracts, etc Other processes. Free information. The Formula Co., Western Dep’t: 122 West Howe St., . Formulas, Seattle, W " MONEY-MAKING | “Opportunities -—— that big Mail Order and Agents’ Monthly that is different, filled with plans, formulas, and valuable money-making information. Sample copy 10c (silver), including Free copy of ‘Building = Business by Mail.”’ a splen- did Mail Order book. CC. Crittenden, 4132 West 2ist Street, Chicago, Ill ’ PATENTS Procured; Trade Marks Regis- tered—A comprehensive, experienced, prompt service for the protection and development of your ideas. Preliminary advice gladly fur- nished without charge Booklet of informa- tion and form for disclosing idea free on request Richard B. Owen, 30 Owen Bidg., Washington, D. C., or 41-R, Park Row, New York v $2.00 INVESTED Year Ago Returned $1,250.00. Write P. 0. Box 3261, Phila- deiphia, — eS eae ote FOR Workers. Here's a New, Superior, Money-Getting Plan that Wins! Clean, sure, quick, unlimited Your in- vestment for this plan only $2.00 Every detail given. Get it today. Guaranteed. Or send for big cireular which tells the facts fully. Pacific Publishing Co., Prineville, Oreg. a PATENTS Different, Time counts in applying for patents. Don't risk delay in protecting your ideas. Send sketch or model for instructions or write for Free book, “‘How to Obtain a Patent’’ and ‘‘Record of Invention’’ form. No charge for information on how to proceed Communications strictly confidential. Prompt, careful, efficient service Clarence A O’Brien, Registered Patent Attorney, 5892 Security Bank Building (directly across street from Patent Office), See pages 154 and 155 ARE you old at forty? Washington, D. C. See our advertise- ment on page 149 of thi Thermal Company, 2157 ville, Ohio. issue. The Electro Main St., Steuben OEM ITOU, 2% Se ' beni 37 LEARN to Paint Your Own Pictures any size, from snapshots, photographs, scenes, animals, anything in one hour's time No knowledge of painting or drawing required Easy, fascinating, profitable. Travel, make big money teaching others. Full $5 in- structions for $1.00 American Sales Com- pany, Box 1278, San Francisco, xe BIG money, evening, mail order business Sample and plan 25c. Box 3093, Bridge- port, Conn ATTENTION | of your own System Real busines and operate New Estate Business, brokerage and insurance agency in your community Office at home. Earn $5,000 year. Representatives wanted everywhere. Send stamp free booklet ~ You can have a k stablish Hayes Realty Association, Cincinnati, Ohio SAWDUST and chemicals make imitation marble flooring Profitable business Di- rections $1.00 Universal Supply Co., Au burn, N. ¥ ee a SMALL capital immediately starts Home Mail Order Business like mine. It’s mak- ing me hundreds of dollars Particulars stamp. Home Business Expert, Valdosta, Ga 66 MILES on 1 Gallon. Wonderful Vapor Humidifier for autos. One free to introduce Critchlow, 83121, Wheaton, Ill. LIQUID Insect Destroyer—formula $1.00 results guaranteed Rubens, 715 Fox St, New York City GREAT Big Mail l0c. M. Casden, Box 43, Muskogee, Okla. QUICK Profit, Honest, Guaranteed, Work- able Mail Order Plans and complete instruc- tions by competent and reliable author. Mail Order Service, Box 93K, Omaha, Nebr YOU can receive 25 letters daily, each containing $1.00 Wonderful legitimate plan Particulars free. Tick, 33388 Arkan- sas St., Oakland, Calif a GROW $20,000 Acre-Crops Goldenseal; 3,000 Big Growers; $10,000 yearly buying crops by mer. explained 20« Charies Dodee._ 1915 Jackson Bivd., Chicago FREE booklet describes 52 plans for mak ing $20.00 to $100.00 weekly in home or office business of your own Downs Cr $ Myrtle, St. Paul, Minn. MAIL Order Business, No part time, or house to house methods. Particulars on re- quest Hugh Allison, Box 6, Station A, San Diego. California : WAGE Earners!—Make big money out capital during spare time made $550.00 monthly. You can do likewise with my money-making plans Sent for $1.00 A. B. Stephens, Redondo, Calif. MAKE high-grade storage battery Formulas and complete dress Expert, 344 New Orleans START Mail _ Costs 5e Sells Write Merry A, | COULD You Here's the plan with “plates instructions Ad Camp S&t., Room 2¢ Order or Agency busine for $1 Particulars free Box 817, Somerville, N. J Use Additional Income? that will positively assure it! No capital required. Just a little work Operate anywhere = successfully Complete details, guaranteed to satisfy, for $2 Further information free on request The Montgomery Company, Box 867, Fargo, Dak INVENTOR’S Universal Educator cor tains 900 mechanical movements; 40 per petual motions. Tells how to obtain and «« patents. Suggests new ideas Explains h I ¥ patent to select your attorney and avoid sharks. Special price (for a limited ti $1.00 postpaid Albert E. Dieterich, 621-C Ouray Bidg., Washington, D. C MAKE—Sell Your Own Goods—Formu Processes. Trade-Secrets, Modern master methods. Catalog free. B. Thaxly ¢ Washington, D. C MS coin or TEN Supply sources, 10¢ stamy Valuable mail-order information Circular Demuth Company, Englewood cow NEW Punchboard Assortments Circular Free Grahams’, 1849 South Broadway, Denver, Colo BUILD splendid business making chipped glass number and name plates, sigr me dallions. Write for particulars Simplex Utility Co., 1133 Broadway, New_York SERIES Collection Letters that oeenes your money without friction. Worth dolla for 0c. Agents write. P Mc Knight Agency, 105 East Juniper, Wildwood, N. J SELL Copyrighted Information by Mail 700% Profit. Printed Matter Furnished at Small Cost. Fascinating Business; Big Possibilities. Particulars Free. oa @ Hinds. Monticello, Tl GOLD, Silver, for windows automobiles, them yourself with our Process and Patterns Fast Sellers Big Profits N Experience Stamp brings actual samy Wilterding, 1144 Pleasant Street, Oak Pari ™. and Colored Sign Letters trucks

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How to Become Success- - M opera- Diego. Ca Or- ery- wn local and required your Mail Part time I

rr ad ee book and samy e Marvel, 2 Market, Philadelphia, 600

INVESTIGATE h oped $2,500 devel- Your quickly ts Legitimate cash Kerr & Company, San Francisco, Calif INVESTIGATE this ire practical way; tart sound dignified home, spare Small capital returns No ng Surprise R. Goods Louis, Mo FOR Sale A fully equipped Automobile machine located in vetter part of Chicago; has a manufacturing propo- sion connected with it Will sacrifice, an- other business calls me away. R. L. Germain, 6337 Was Ave., Chicago, Il A BUSINESS That Gives You Bi 1 new, every home wants t spark! ing beauty sells itself brings sample, prices, and selling «, E. Solaris, 16 Crescent Ave., Ma MANUFAC Fuel ! Power, isse pay you nadnock Bldg business duick ASs awaiting St shop the it also

ne *rofit. $1 mr plans. severly, g I $s to

Ss I TURE gredient Ethyl-Super- Increases mixed— Literature Kor- Kit, Repair, and Millerite! r Gasoline Mileage—saves gas—easily profits great—valuable Formula of this, Lightning Electrolyte, Pro-Tex-U, Amazon Rubber fifty other Biggest selling Specialties in all lines will be ent on request Miller, Seamelst, 1115 Grand Central Ave., Tampa,

Bricklaying in a ntractor { r lilding Emple Grand Rapids MONEY MAKING Order 10 School ular run by As-

Enterprise Booklet, Plan, Samples, e, Decatur, Ind if ines Teer xpert wi gu Har CHEMICAL and Trade Secr Ww L. Cummings Syracuse $25 we for newspapers, mag nece iry Copyrig Syndicate, 981-B _W ANTED Patent Patent News lay 0 Wood N. J.) $2.00 PER Hour, Instructions 50 Mo Address >. © y par izines tht book St Louis Finance Washington Advertisement P WwW. 166 Ma pular Ser Spare Time Pioneer Sales Outfit and Co., Belle- arn $3 fees openings busine Lk professional specialty, the tra you can attend by any at home in a small expense; no further capital required, no goods to buy, job hunt- ing, soliciting or agency Address Stephen- son Laboratory, (1) Back Rav. Boston. Mass 3,384 MONE YMAKING Plans, Formulas, Trade-Secrets ineyelopedia Business Op- portunities,’’ 3 mes 98¢ Ideal,’’ 5501- PM rth Rob Chicag new in foot 000 t makin every 4 1 ie ne

BIG profits Establish y out capital in your s1 ur own permanent busine No peddling nor s No outfit to buy We teach you how the business that is all around you today for free book—no obligatior Company, Sunderland Building Nebr START recharging experience Hoburt NEW Spare First Horst A of quick yu time with- iciting Write wood Omaha your auto needed Ohi Plan ( Time Sure F ime Offered own and

moneymaking busir radio batteri Outfit easy |{ men Tr hted K pyrig Quik Circul Wa WORTHWHILE ur Own by new sure, positive want it Get it is new Rae, Publisher, Portland, Oreg MAIL Order your Breniser’s Famous Handbooks start small, grow big Sell service, ideas: enormous profits Spare time to begin Get complete set, 11 books, $3.00 and be posted. Breniser, 335 Walnut, Phila- delphia Descriptive Catalog and big batch interesting mail order information, 25« None free UNPATENTED Ideas Can Re tell you how and help you make Free particulars (Copyrighted) T. Greene, 810 Jenifer Building, ton, ¥ Mail-Order ines thods, up late and big. is the latest infor Circular free M805 Oregonian rion Bldg., Ihusiness is »pportu nity teach how to merchandise Sold I the sale Write W Washing- POPULAR

MECHANICS ADVERTISING I MADE Breadmaking Booklet tells LEARN the « come, quick res { “Skillful Collecting’’ tors Assn., Long “WHAT to Invent for ent News-¢ Washington st ‘HE MER, Alliance, heme one from three; one Try your luck copy 10¢ WOODWORKING Electric Sharpening at home. Investigate. wndale, Kans City, Mo SIGNS and Showcards Easily painted with Letter Patterns Large variety of Styles and Sizes. Sample for stamp. John Rahn, A2433 Greenview Ave., Chicago INVENTORS—Write for our Guide Book, ‘“How to Get Your Patent’’ and Evidence of Invention Blank Send model or sketch of your invention for our free Examination and Instructions Randolph & Co., Dept. 435, Washington € WE Start everything; 1 Week Home xperience; Free Marengo, O | Good in- | booklet, Collec- $30 Frer ' 4 years Ashbr ok 67 m business Interesting free National Newark, O Profit’’ . «

free. Pat- Ohio, prints Big criber making ther $10,000 from 31 . Three months, 25c; t thy 5,000 an Lawn Mower 415 South as You in Business, furnishing men and women, $30.00 to $100.00 weekly operating our “‘New System Specialty Candy Factories’’ anywhere Opportunity lifetime; booklet free. W. Hillyer Ragsdale, Drawer 4, East Orange J DOLLARS Yearly in ir mushroom dope Particulars 13 East 89th, New York EARN $10 daily silvering ing and refinishing metalware, liers, bedsteads, headlight E. Decie Laboratories, 1133 York SIG ter \ N No Metz, Sackyard free mirrors, plat- autos, chande- Outtits furnished Broadway, New let- from Beau- on glass order for and prices Ave., Chicago naking toys. We for complete working Perfect’’ Cut made easy Over 40 styles Celluloid, Oil-board exact gold-leaf lettering Instruc free with Write for samples stem, 4704 Vincennes MAKE Money at Home—t show you how. Send $1 drawings and instructions Dekalb Design- ing Co.. Decatur, Ga $3,000 TO $6,000 Yearly making it Send check today-for our invaluable bo Real Estate.”” $3.00 and How to Real Estate and Insurance Business Absolute satisfaction guaranteed Free cata- ! Realty Book C Dept. 52, Cleveland, N work patterns. minus i and with tif now patterns R Sy ea Want it? r money ks How Others order to Sell Cond eat $1 are e into the Crispette business. Crispettes fou ean ioney ng Every- make a frite for , Spring- start yo Eakins, 1959 High St field Ohi GooD M

y easily comme 4 at yr ir s E a 7 cafite, cs

MARBLI t ixing instructior wood or cement flooring % in proof, waterproof, low cost colors P 200 Chris 4 thick sanitary illustrations ntington Money in Y Order Secret methods never hefore free Leon Lambert COST $5.00 ferri Mail “L succe ambert’s ful irticulars Wichita. Kans Trans- ur ished. P D your profit 75 ymania letters on aut trunks Send today for outfit or free World Monogram Co., Dept. 73, pub 529 $104 decal¢ (DVERTISE h i 10e¢ word P oP CORN tI icle Co 1306 F Des to Sell Patents’ * free News-H. Washington, D r MAKE toys and profits Instructions y Astrolite Comp indred m three Ky North- wa Patent gazines, Pennell, Covington kinds All Moines,

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Ik HOW novelties at home and 200 illustrati any, Sharpsburg. Pa CHEMISTRY AL Catalogue for Ott, 1218 Chestnut chemical problem solved and work- ing process furnished Five Dollars Write me. W. Stedman Richards Consults Chem- ist iddress, Box 2402 ym. Mass TECHNICAL information cnalpens, form- ulas, trade secrets Jacob Sluyter, Chemist, 2525 East St.. Davenport. Iowa ig Bi ns,

Experimenters CHEMIK mi Reading. Pa George YOUR

SECTION LITERARY SERVICE

NEW 1 irketing p into checks ‘ plete li E. Poindexter. Everton terary fo ——— lan tur

WANTED—BUSINESSES FOR SALE IF You Want to Ye Cash quickly and ately prospective buyer directly to you ur ex pense. no matter where located. We specialize selling out-of-town businesses If your business is worth $5,000 or more, write us The Mutual Security System, 68 W, Wash- ington St., Chicago

Sell pri Business for we take the ur at FORMULAS AND TRADE SECRETS SEND 2 tions Article mense and T Lancos 114 SELE(C Smitt MAIL Magazine : ic Silve Marketi 9 for mpany, TUR profit Up rade Secrets National

TED Tucson \ Order 10 Brooklyn, ANY teed St. L $50 succes 10,000 and ing every one that the 150 Polishe stit ANY Central FORMUL ic Pacif practical hundreds large vol postpaid. i postal, you f Formula b postage Ontari Formula General yuis MANUFA‘ sful mail-or its Pentlan SELEC of business, ime Send if you want He Wh hit ar om ok, give Popul St Re Wall ite, Salve Mirrors et etc three ls, Mich lesired Laborat AS th Publishing Box 179, 250 GOOD formulas Rodgers ( MANUFAC Supt No live r for F ng Hin 10 E to for th ar Syracuse Pro your orm fitable laie own e ly N formulas 35 riz manuf estvold Co., $1 RIN ler plar i Service TED reciy so-called alphabetically che an es of 801 M in nley en the n the aper ¢ Linim ‘ and formul ri 2331 win Ua Prinev ille at Co 1,000,000 FORMULAS, DON'T ula okKivn tire Fifth Formula Shop, 5501-F be $1.00 N i ( 10,000 P¢ Y Secrets, et

every ofr 1 by \ BEVERAGES Y our infort can in able till suppl Grar 50 free ill lines you ) VALU I Favorites atior r e, Wash FORMUL tenewir Gas Tc Shop, 5501-1 K

FORMULAS T anteed Guar Star literature see what ing the 1 Central. Tz larve T bald best >M, p Nels Y Extrac Reliat rmula ¢ rk AS, 1 Dry »M he No bes np I can Mi ampa es Fort $4 Mecha S06, ¢ MON VY-MAKING Pi ionths 25 acturin Satisfac ly Co., 3639 G is in mical, Jia ar j Mai 4 Y ‘ 95 minute line « form te il proce ) page ney the 20th pos ni

F leaner trade Ss U Cent tman rmul 4 book Norwalk arratr P impli Ss 1,016 page Simple n, ts le Robey ha ne ] neluding Bet teries atalog rth R t Cher Reliab! brings big interesting list give y ller, Fla ila Yecat bur u ir julas Free if you order quick North ir-gr A

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AGENTS WANTED

MILLERITE ibout Ingredient Saves Mixed great you orry literature laitie hurry ng ¢ ' zon only Food Automo bile lines ulas est Fila $1

I i l Flynox New for Gas — from my $5,000.00 this G ut send of this describing 1 in all ement, uid; Denta- and other t few drops Self Vulcan Guaranteed Products ; Office years manufacturing and References » WEEKLY Ww i! Don’t lines Marcel Here nderf ast Knocks simp to pas today and oth atest, t Mendit Permanent Whiter as perl Te hin di kills izing Fire Toilet, Specta Miller, it line— ul Ethyl Increase Y Carbon le s this for fu er viggest oth pped roomf Ss Formula $50,000.00 for by ll valuabl le I ellir F rubber flie i Repair; Extinguisher Medical alties supplying the P H late be Inform Che

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Page 213

atl, hio. POPULAR Crew Man- New In Salesmen— Dealers $75 to $100 a Week tion of 1925, just out Every n sight Fixit"’’ Rubber res and tubes Vulcanizes with- Seals punctures and blow- s re repair bills, increases mile- $ Sample free Marquette ny, 2323-2327 Wolfram St., cago Til + 00—$100.00 weekly; Sunlite eaner for windshields, show Big quantity seller. Amazing Summit Specialty, West Ho- in your spare offer to make previous ex- no money required; write ns American Products Co., \ tidg., Cincinnati, Ohio. P ~--Moseo Corn and Caillou lild you a steady repeat busi- s today for pocket size trial out- Company, 230 Searle Bidg., 0 \ t to earn money wonderful women; no ave a nd Re- i 0 tunity for agents to take orders 1 sportswear, $2.00 to $15.00 to $100.00 weekly; pay daily collect; experience not nec- Co., 306 8S. Frankiin, ind Jeanne a week, furnish auto and ex troduce our Soap and Washing uss-Beach Company, Dept. Aiz, Falls, Wis eral hundred men to turer taking orders for peoats, sweaters, overalls Big daily Send for free sample thern Sales Co., 219 Northern Of- (hicago own boss selling all wool tailored- trousers $5.75 up $2 commis- order 10 orders daily easy yutfit free. Write all about your- Lincoln Tailoring Co., 34-C East . t. New York FORDS need I Big Profit ick Teuscher repre- shirts \\ I>. se Greater Grip selling Deaiers Belting Co., St $500 month- new discovery x equals gallons gasoline iranteed, ‘Your na on boxes Write quick P. A. Lefebvre \lexandria, Ont., Canada. _ ADE, in powder—just add cold delicious drink you ever for home, parties, picnics Start in this business—big ily made Send dime for ten ge, postpaid 7 kinds, Cherry Lemon, Strawberry, ete., for 70 50c, postpaid. Morrissey Com- 25 Madison St., Chicago ! Silvering mirrors, eware, Outfits; Plans kle, Plater Marion, Ind START Mail Order Business; Watch Your- Gr ost 5e Sell by Mail for $1. Ni to $: 30 daily Information Free. A, Surety Service Company, 551 Har- St., Rochester, N. Y DEVICE Which Shines Shoes in a e without Soiling Hands Tested by Housekeeping.’” A Dollar Bill for k and One Tan Outfit Will Start Earning 150% Profit. Everett & Bar- Bloomfield, N. J P ANTED Agents. To Sell The King Va- for Fords A Perfect Device for € Something new and regular ir Ford run better. Throttle down es gasoline and a permanent ne- r all Fords. Retail Price $1.00 to agents for the price of one interesting terms. The Whitely Sup- House, 1720 E. Highland Ave., Muncie, lanager-Dis tributors ing *‘Magic Fine “Auto- Free. SY Money 128, ENTS. New Selling Plan! $1.25 pre- to every customer on a $2.00 sale ting of 8-oz. Vanilla, 6-oz. Shampoo, Lemon Lotion. A big hit everywhere details free. Territory going fast. e today. The C. I. Togstad Company, 6, 29 South Clinton St., Chicago, Ii! ORGANIZERS “and solicitors make good enrolling members in national organi- _ working for a modification of the fad Act. Apply at once. The Ra- American League, Dept. A, 42nd and ‘ New York City. ‘S! Sell Women’s Dresses! ine, 75 styles $6.75 to $19.95 ng cuts price in two. Last Agents averaged $55 weekly. 1 for $100 to $200 a week. business. 89% repeat pies actually Free, no deposit. Dept. 153, Ti- season Full Build orders. Carlton, 337 8. Franklin St., Chi- VET@, Wehhao. MECHANICS ADVERTISING $8.50 TO $20.00 daily easy—Introducing New Insured Hosiery for men, women, chil- dren—57 styles, 37 colors Must wear or repiaced free Repeat orders sure—Nyland made $595 one month—Edwards, $460.60 Mrs Bone, $445.25 Why not you’ Even spare-time work should pay you $3.00 per hour—Your Pay Daily in Advance—We de- liver and collect—you spend all your time writing orders—No experience or capital needed. We furnish elegant outfit all grades, colors, including silks. No matter what you are now selling, it will pay you to get our offer Station 256 AGENTS selling Value Spors Macochee Textile Company, , Cincinnati, Ohio Something New. specialties out. 25e brings both $1.25. Money back if not pleased. Co., Lesueur Center, Minn SELL Books by Mail! Big Profits! Par- ticulars Free! Elifeo, 523 8. Dearborn, Chicago EASY Money Applying Monograms on automobiles it Simply transferred 5 minutes. Make $1.50, free. ‘‘Ralco,’’ 325 Harrison, $15 TO $25 daily is easy tinctive, big-selling line of traordinary values Extra monthly No experience or capital sary. Sales kit free Write Horsey- Co., 610 Main St., Crisfield, Md. WONDERFUL inver needles for phonographs Abolishes scratching pocket. $20 daily requested Everyplay Bidg., Chicago AGENTS, $20 Two best Gold Anyone from paper; cost S« Boston, with our hosiery. bonus Initials, ean do takes Samples Mass dis- Ex paid neces- bassett jon eliminates Preserves records Day's suppiy in Sample on approval if Desk B-6, MeClurg daily easy selling house- held necessity every women wants New in- vention reduces price Big profit Fagley & Halpen, 37 No. 2nd St., Dept. 5, Phila- delphia, Pa QUIT Chasing Rainbows. We are placing on the market a new and powerful sales get- ting auto accessory Just patented and first introduction to the sales field Uniimited carnings; be the first agents; investigate. Geo. A. Schmidt, 505 So. 16th, Omaha, Nebr NEW Camera inside camera in takes and finishes pictures one minute Make money selling cameras or taking pictures. Crown Co., Dept. 951, Norwalk, Conn SELL Tapestry Buffet or Dresser 19x54 inches, Blue and Tan effect Sold—Good Profits Cost $1.25 $2.00 to $3.00 each. G. A. Payne, Station D, Columbus, Ohio BIG New $2 Seller! Each sale nets you $1 Every household, hotel, merchant, auto- i te ‘ Scarfs, Readily each, sells Box 102, - takes one or more Secure your terri- quick Volk Mfg. Co., Dept. P, Cin- innatt, Ohio AGENTS ing device for all Big me money demonstrating oil- makes of autos Every driver a prospect. 5 investment Ex- clusive rights to live wires. Free demon- strating sample for your own car. Write H G. Saal Co., Dept. A-135, 1800 Montrose Ave.. Chicago, Ill START Mail Order Jewelry Business your own Big profits in Jewelry Kv mail brings money Everything Catalogs printed in your name four orders for goods filled at wholesale as needed Sample catalog 15 cents Particulars free Acheson, 2218 West € Richmond, Va PORTRAITS, photo pillow tops, frames, sheet pictures, medallions, merchants’ signs, food products rubber aprons, guaranteed hose, toilet requisites luminous crucifixes Catalog 50 specialties free 30 days credit Jas. C. Bailey Co., Desk A-6, Chicago BIG Profits, New $3.50 Automatic Ad ling Machine Quick Sales © competitio Ten daily easy Absolutely accurate Full guaranteed, Pocket size Business panko everywhere positive customers Exclusive territory to workers Act quick. Bassett Company, 1458-G Hollywood Ave., Chicago AGENTS, Salesmen—Sell New Thermo- static Automatic Carburetor Control Attach- ment for Fords. Big Profits, full or part time. Burns 95% air. Doubles Mileage Attached in 2 minutes. No drilling. Does of ery furnished iry automatically exactiy what Ford manual! says do by hand Cadillac now using Thermo- static Carburetor Control under Blancke license. Write today. A. C. Blancke & Co., Dept. 805HX, 602 Lake St., Chicago GOODYEAR Mfg. Co., 174X Goodyear Bldg., Kansas City, Mo., is making an offer to send a handsome raincoat free to one person in each locality it to friends. Write today 27,000 RECORDS guaranteed Everplay phonograph needle. ords Abolishes scratching. Day's supply in pocket. $20 daily. Sample on approval if requested. Everplay, Desk T-6, McClurg who will recommend one Preserves rec- with Blidg., Chicago. SECTION 39 AGENTS, will have the a better such a on 5 Salesmen, Demonstrators, you devil's own time trying to find seller than ““Zippo.’” If there was thing we'd have it. Splendid profit ie “Go Getter’ repeat article that sells on ten second demonstration. Works While You Watch It Demonstrates value, while Others waste time making claims. New dis covery! Greatest Scientific Triumph of the age It’s the berries. Haven't room to tel! our story here. Write immediately. Karam Smith Co., 606 Bozan St., Ft. Wayne, Ind $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 Por explains Samples Free. Picture Friedman, Dept. 8-H, 541 W. Lake Chicago AGENTS guaranteed Nustile You $75 Weekly Selling hosiery Your pay daily write orders, we deliver and collect Special Monthly bonus Sample outfit furnishe Nustile Hosiery Mills, Dept 1-6, Phila delphia, Pa WALL and Auto Emblems—all lodges $10.00 daily easy jvery member buys Absolutely new. No ee Big fall spare time money maker. Write for free sample plan. Crafts, 33144 ve, Chi- cago $51.50 a new gas Beautiful Samples WEEKLY light light. Introducing and selling burner for kerosene lamps No chimney No mantle free Experience necessary Write today Luther Mfg. Dept 542, Cincinnati, Ohio AGENTS——A_ piston by all mechanics as the needed ever invented. sight. Take orders Get territory and tool $1.25 Postpaid kane, Wash. AGENTS Wanted to anted 100,000 mile puncture proof auto tir Tire Demonstrator free Write for pa ticulars. Everlasting Tire Co., 6225 §& Halsted St.. Chicago McDONALD Silver Polish sells fast l-ounce package and terms 10¢ silver McDonald, 18 Agawam St., Lowell, Mas« GET into Line with Giibert’s House Wives Necessities. Good Profits Easy Sel! ers Six Samples for $1.00 Gilbert Sale Co., Milford, Conn., Box 26F MEN and Women Sell a live or spare time No experience Samples and full particulars 25¢ Profits RO Mutual Supply Co., Bradford, Pa AGENTS, energetic every city, earr $12—$15 daily with Ideal Dust Shields millions of prospects; unlimited field; quick cash sales; build mail order and direct busi ness; send for free folder and learn how Ideal Equipment Co., Canton, Ohio AGENTS, Monogram Automobiles 1) Million prospects $1.40 profit every $1 sale Wilbar made $29.50 first day Free samples Worcester Monogram Co Mi Worcester, Mass AGENTS—Novelties from Japan. $20.00 a day easy ing Proposition License Sample free Boston Supply Milwaukee Ave AGENTS | sell tubes Every onstrated. not Company, ring tool, admitted cleverest and most Positively sells on We deliver and collect order books free Sample Art Tool Co., Sp represent our guar Large Daniel “one. “All men, Germany and Write for sell unnecessar) House, 1055-59 Chicago Minitmend for tires and auto owner buys when dem Costs Je repair, saving 600% Superior to vulcanizing Amazing profits i repeat sales Hart made $85.00 first week Particulars and free sample Co al Rubber Co., Dept. 17, Philadelphia SELL Union Label Measure Suits direct to Scott System Wholesale ford Street Soston AGENTS to demonstrate and sell to caer owners Nationally advertise ito §6Polist that removes the dull, cheapening film frow motor cars; quickly restores the factor lustre, and leaves a glass hard, beone-dr dust-proof surface A scientifically correct Cleanser that is each year saving thousands of car owners the expense of repainting, yet the cost is only $1.00 Agents everywhere proving that quick sales follow demonstra- tions; and profits gre steadily from re- peat business For omy testing sample and details of agency, address CC. 8S. Mfg. Co., 502 N. Whittier St St. Louis, Mo AGENTS: Gingham House Dresses $8.50 dozen Retails $1.50 Sample $1 Write for free 200 sure seller catalog Economy Sales Co Dept. 304, Boston, Mass FREE booklet describes 52 plans for All-Wool Made-t wearer for $24.5 Tailors, 99M, Bed making $20.00 to $100.00 weekly in home or office business of your own. Downs Co., 2325A Myrtle, St. Paul, Minn AGENTS wonderful song. Sells at sight. Sample lic. Irl McDaniel, Lebanon, Ind

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40 POPULAR MECHANICS ADVERTISING SECTION

PATENTS 1 ‘ nts ir \ NTS—Best er; Je Rubber R ir | MARVELOUS Radio Gas L ter D t r eve t of G teal , x er | R 2 t for I H oO f in tw and \ : ! i R r I r r | he lif f é Send $ ple f 1 ) r i i I M M r ‘ P = sler. J particulars how t st.. New ‘ \. O'Br | t i c Ama | VHERI 2 RK P \ 8 S ri I ‘ P I D ‘ " _ ¢ Bank | f | ILD 1 bu 1 W $ ( Pat oO W Dp. s | nu i I DIRE¢ I Dri | VW t s K | " ( Mf ‘ . STARTLING I f I ‘ y You « AN G D f j | Gi rs \ ki . I \ 7 x ) ; ' M . : 1 | ‘ P Bluff, A SELL B ‘ FIRS I \\ W t I nS } ( I l P Slide-O0-G i ' f ¢ , N ff lk 1 Geor : Ste : A t t Se fa ' I l \ | - $14 P Ss | j . I I > 1 \GENTS H i " ( I ( W : ~ = N Y ik I I ROY BLADES ; Pr »ATLY M G O | The s c I N \ \\ Ex 3 | | NEW w i e \ \ G R S W Quick P V\ I ri ’ I I Dak R ’ \ | , na Ex oO SIGN ) H M M i J P \ ( I \ i é \ \ ( 3 4 Gold W s I rs | 5. A I ( tet s € = WONDERI I Ss AG ENTS—M 1 $ ! 5 I r I ( } ' I e s : I \ \ W ’ ‘ , x W toda Starke Phar | f n it , r " ‘ ! ( (,! bidg ~ L \I Ea M Age | ter 1’ I> Ruff BOYS—M \ t ‘ : I Mend tel AMAZING ne latest N Ace S I , P I ew t t tche ! Pu B n Kni . B 1. M hou i 6 I f r ‘ f \ ~ f1x Wr . W D M t \ I B ( 8 M I ) SUMMER 1} oO v) M I } } s ~ } f \ . I Mir D } AG \ B G \\ P 1 | I i R ‘ x . ae M | ( I S W I i I R r rs—s ‘ s ( s I MI 0 I ( P } ' : s MEN W $ P | rr I. & f \GENTS \ } ‘ > ; ry § \ ’ G $9 FOR \ W s ~ I I f ( ( ) ID }’ S 1) | r ‘ R 1 ‘ j 1 H } s W ) I AGENTS W M \\ : | J I ‘ M ‘ > - I B | AG! rs, b t ( H I | \GENTS, M $ H «& |! Bb 2 \ i r oO Y W | p G eed l ( i } fr ¢ I - | Represent es wanted. Midwest Drug ¢ - ss A 2. “ \ ir Ow G For nd Nagt S ‘ oO 1 ¢ ' A i, Cata ' . - : : WEEKLY I ‘ \\ t D. ¢ | I ! r 0 NUFACTUR SOMETHING ne P R r Re f ' ( s ( - f i ) \ ‘ \ ( | : x. x : b i CHANGI F EARN $4 $80 fr | Pr I I \ Wi ( De _ a, € t M M [ V rs 1) | | T i ’ x R 1? r ‘ FREE Infor i l l Mone | UNIVERSAL Ll) ur I nna WW ae ns pe SELL I Ele : I Side tee "Wieberiaes tee 68 kx ( M are j r é g | ENERGETI I ki N : , t ‘ Parke ¢ $1 M ~ ; i = * M \ I> \ t of AGENTS = I 1 ~ 0 N Db i N ¥ r I . ) \ ( r i os ; ! 1 . f oO G ‘ ‘ a s Exper t I 2 G M I M Q it, M , : RK ! I I t : YOUR ¢ \ I w | ( De PM AGENTS é $ \ ‘ $1.9 P [ - “ 1 , B ¢ $ i , ent re I r S I \ I gg Me he . ; J » * I , for fr to int NO 1 N Fre r I \ I sO NEW O I 0 f : I \ 0 R RK r R e M ( : % M s ( 0 f i : \ i Box LW s for - I , Calif MI ; an : “ STAI .) ¢ ¢ AGENTS & Retail $ Your P , - * P Qui ‘ M Uv a W erf é \ Ml VW for Redd R r t QO f : ~~ . Magi Writir P , | , le OAS ya or f rie Ser \\ he ’ ste H I i AC \TS ~ EN t 1 A ing f P and . ‘ , AGENTS ! H ( S ' t I H M ‘ g | l e! - a f I D> I 5 I write t H I ( Street, Br klyr N. ¥ & ¢ On? Gr K r. Det t M AGENTS—N-R-G I I \GENTS—N . M : OPPORTUNITY: Metal Weatherstrips i ieee” oa week Gold l f W I ‘ ! 1 = . s ‘ i ¢ Ss 4 M i ( . . - ) rr ; M. Mor ; I ( Box I N-R-G | I WANT Infor tior I f GET p ed—G i pri i f selling arti Wr Institute Moor fl i s Sinclair di ‘ TAR a N Yor ec iw é Kg ’ LESPERANTO—I I 1 be noys. G Me \\ t t to | I Bi . ¢ come our G No ¢ M t S \ oO 7 " ‘ rerrit I 4 ¢ B Ss f I N s Prir ( te ( We \ perar 20 +f M Str New N. J N W P | D 4 SR a ANY man |! ‘ br | Oo. K BATTERY Char Guarant 1 | SEI I Owner eft start furniture re i palr ildi i? re y t Age Ga e | nr t Age € ryw | jobbi nd har 1 $ near | t r ( r and tate $ $ week Hai ' ! x r s ‘ ree tw at $ st W lerful needed J I il, 14 S Ni eo HB. i ( 2 Nor M Ss Dept \ S Pr ( | Pr i, Pa I \ ( f St ( 0

Page 215

| Didg., Chicag

_. «sone = = —_ _— —_ r ample lic. a anie e ano Cc . 4 1 ; L ' Ss Irl Daniel L t D, ny POPULAR M ECHANICS ADVERTISIN G SECTION 41

sells \GENTS—W for 1) tn Free Samples. Sell | a pr } rer direc! ade’ Shirts fo - WANT dis a direct to wearer for large | p : istributin at ence required oe No capital pouteas handsoap; . agent for Hanslick If-s¢ d_ bonus Madi: any earn $100 b e hands without” removes anything — _AGENTS—Se : ] r New York son Mfers., 511 ves iy a customer; gre pone to skin: ev rom sight Best Sell Newark Felt R " RN Your Spare Time int an in business ; ty for hestine + age J aw on market Bi ~~ — missions every nto Cash. Make s Co., G 124 West » free. Solar Prod ion and plar Write quick for g. satis- rtl nue Tablecl y day selling F . MAKE st Lake, Ch uG- 27C Sixtee 1 Newark Fe or informa yh cloths. Sulien 3. a one Me profits selling 1 icago : ixteenth Ave., He. Rug Company ‘ fAlL Ord eset, _ , 24 East | raincoats line $12.50 suits ond tne nationally ae... NTS, sell guarant = oro. M Ko rane Business Wecallent oid umbrellas. nget watesproot ae Sapeeate, also Make Dye Comes need chiste and hos > ( o Carry side tooseve sharpening all n ngenious i s volar » . Newark, N ducts NEW os, Stapleton, N: & Profits G ng all make s invention f ing ‘ ‘TS—I pay _N.J NEW Marve 1, New York Ci ireat econ¢ s of safety re r ] a eve ; — fricti arvelous Pocket Ci rk City. “ omic value razor blade Bou ers, house, strest —" night. —- — 25¢ o eapid M Lighter No a J a Easy ae with hen oceaees I deli sses. Experi- Broadway, New York apid Mfg. Co 7991 sale + uatapne Agents ha o sel Big re [ : . deliver 3 . — sot rk , 99d Full . s having re ‘ repeat » Clea er half. Wri and collect $60-$20 —— particulars. RK emarkable su ght Carol Lee, 12¢ rite without obli ter 200 A WEEK D Broadway, N obt. H. Inge success 2ee, 2 . o 3 y ah ‘ ay, New . ngers City. Mo 6 Gateway Station Free a windows -— Gold Let- AGENTS oat York City soll, 476- ‘ ; , , = ) 5 +6 tT ’ r ‘a “ Mi ” ’ only t GENTS—It’s easy t . agents. Met _ Liberal aa applied pound. Your nar fagic Washing © ) ms. Ralst o sell our paten ~3 Clark. Chi tallic Letter ¢ to general peater 300% ame on package - om Hips awe alston made $114 t fibre Clark. Chicago 0., 438-B North in 6 we sic ® profit filler Great re 2 r Wri Great repeater one week AGENTS—Men and Women” W. 1 eks. Sample fre made $1.000 Wr Write quick We Protected women 4 Men and Wome 35 - rving Park, Chieag e Besco.”’ 194 Nebr y, Box A, Jonesville earever Broom 3-In-1 Hot anxiously waiti n. 35 Million AGENTS, both - ; GENTS: Big Profits; on Mich Syringe - Water Bottle lnk to buy the control new house noid , we manufacture sive 7 \pplied. Sampl - — Sign Letters, No ae cents ana Fountain Cos profits. Exclu = d articl i. wat « an8 f (fer to General Agen Paes ree Liberal making ig. Write f missions daily onnolly, 123 sive territory. W Bente Ar Agents I siberal ing plan or startling 23 Liberty 8 rite No itage ~- nterstate Si tik , Lobl . ing mone PO t.. New Y Ww ; PROFIT n Tt an samelneaaet tion. _Biddleboro 9” __papeaemaees tose. | a = as Wonderful Poll S ~ : 7 sellin SELF ——r — . p ans all mets olishing Clo . I for clothing ” leat mysterious stain Bo 7 - THREADING Needles, N r powder a Rat liquid n = 0. X Co., 801 oe oe et Ful- . ooks, eshine alinn ts ot Needle o50 and “Modern 2 id I mag luce GENTS—Millio ay City, Mi niet = ine side li 8, find sales in Sample fr 8 a’’—sell ‘ ons of we . Mich. | Profits, 5 e lines, easily in every inboro 8 ee. Gale & C s fast at r Sharp-Easy ‘men will buy the | Lee. 1 sample and catalog carried, b St.. Boston Co., Inc., 15 Ex ‘a rs about. the A] qtoday for the | Lee, 145 East 23rd stalogues > me | AGENTS ee Ww 5 Ed nd moneymake fits made sell | GENUINE G : e ork ertising Ciga eek placing % Dept. 813. D er. Premier M oe put Led Gold Leaf Every des ar Lighters with cing Ad 7 813. Detroit, M Mfg. Com- on Store wi zeaf Letters any — : dealer wants ith glass front s\LESMEN—N . Mich tarnish “F indows. Guara nyone can each. Write f one Average nit . Make 2 a a 2 4 arantee " 0 »e . orof , | 8 Morey = mage Rg] to $500 monthly ra ree mR — oo nee | Be Dept M a ee. Drake Mite. _" 1 Quick. easy o trade and ca = 4128. ite today r anc ORTRA — - ; . , ’ sales . an i i-A N ~y Metallic L Phil 7 AIT Agent Write f. ales. Best season cat sc orth Clark. Chi et- hilippines s in Hawaii, C . s ason_ jus $4 CASI " r Chicag es and all . aii, Cuba he 1Co.. & or_ special offe we F "ASH with ever ago for catal all foreign cot the ng - Sect. P — r Morey ire-Foe every sale . wane atalog and lowe 1 countries 4 ees IGHTNING Blissfield, Mich ' a Sg la pistol-type = Capt. Burke’s Portraits and aan prices on Guar ve ae > eoumnal attery Charging Fluid! s 1 Una with one Ry on cure- Man Friedman, - Samples Free. mh i Supplies.”” 2 or ad ender * — stops —— unuersells “ ; used on U St.. Chicago - export Dept., 541 1 - low & 1G Money Sellin urphy Chemist. _ uto- fact wtes rec rs — as it ay $20 PROFIT daily se ne sake S : Every € g Gold Initial $20 a day stitutions bu - res: | costs Se-5e each; y selling ne ar Owne ils. Quick 1 jay easy Ww y in quantity; aiane : each; sells 25¢ ne books \ Make r Buys. Y . K irke Fire-F rite f . ty; amples 2 : ic. val : ve.. O ike $1 : or seat ire-Fo = or sales = ‘ - _ value « Daily = 4 Every Sale aos ¢ meres cinnati. Foe Sales Co., a, plans Specialty € Catalogue get" Three i amples Free.” NuLit No Ext rofit EE A, Cin- ee 661 Broadway, N ebook et Hartt ay “ NuLife Mon ns penton e om TO owner tire a ss \IT and Photo. om New York = onr : . n Com- ality ¢t . p agent > rt > — oto Mex k if VALUE _ = ; is Mellinger y tw take or L wanted each Jo- | any ~ a ah ee Ager t I ir dienes sveryboc . bond 8,¢ © and cord tires: vandmade | aM expensiv sh, finished on canv ee rs and lt, $2 7°. nen ale phar owe shipped pa. 12,000 ie tos guarantee tion se get = painting aaa as Bae like ! big aa se ( ne: aid on ¢ P 0 seconds) ; special the biggest w sensa ridg ig money. S« resent sales fore free; no capi m approval; ge ; pecialty fiel money mah ' - Some valuat ree ait capital o : ; get your tire \ eld. Take — oe in the . Send for f aluable terr 4 make $100 - r experienc es with the fz orders i . ; ree s itory to $300 ence requi amous P. & G n combinatior g opportunity ¢t ample and prices sale price ae weekly. Writ red; and make & G. Photo M i i. an o establish a big ces Saat res and sample kit e for whole- Pudlir a steady “‘clean-up’’! edallion k Co. $25 Pitkin Ble’ Ne M Pit. i Co., Dept. 300 Address, Mel- | © BS ee, Sap MA.” 3208 Boo NTS “Ss tkin Bldg., Newark wt Y mTrt ept. 300, Phil adel phi — City ‘ : ork A,”” 259 Bow _ omething Ne “wer : MALI % Iphia, Pa = 300% PROFIT ‘a i Club ean tien -- for Billiard, MAKE $25 to $50 Week . Rite. New an —Quick easy seller, K I ae i ayed Soe est Amus ement from mill a 2 Philadelphia Hout pounese rubbing Peay Washing fwd y a i » 44th St ss I Cor pair gua’ men, wome osiery, direct premiums mak 1 simply an dg. No \GENTS : . Brooklyn. N. ¥ n- guaranteed. P nm, children. Every D s makes sales nazed Free Pr > $60 te » : How t : oe rices that wi * very istributin “ easy Fast —_— Fone Burnished Genuin 200 weekly putting t Commene Start’’ tells the acon ‘G Free book | bing for cerita free. E abear’ ater me Experience eo window mo Rng ee . Desk 31, Oe ier. Soatan Cons Products C 1937 Write quick ay gral alamaz Premier Letter Co. ie Free sam- ec UREATES T Sensatic =._2 SELLS Lik Irving Park, Chic — TLE Ago » 121 N. Fran- with. $12 “—— selling Mike age toilet = Rust al AZes New Instant an. . STLESS Sponge C dres g like blazes at $2 inen, et wer *o oth Stal e—N bat ponge Clo ; each essmaker’s 8S it $2.00 en, ett F r clothing h. ¥ Rub—Dusts. aay —_ swe Invention Products stomer. Winner for 7 Free to | Quick Profits ins. —— every sale . on Payee ran pli i —— hahin = s Co., Dept. 56, Chic — Davis Christy, 505 Uni ‘ree Ou tfit Write T pis se). Se eTenes., etails (50c) AC ago ? = ym. Newark a oday id. D ene Chae sample Free.” Nuli , (50 “ie 3ENTS Our gold-e 200% P : ark, New York EARN u ife Sponge. — lerful sellers: it yed needle cases a one * nh selling G . . tN 7 ; ' $3 . . nmense ases are m e articl jem kettle lak aps Bricklaying i . 00 weekly; proof profits: $50 Houseke article with ¢ e bot . ling Contract gz in a School sen sample outfi Foo and part 300 to usekeepers buy : a dozen us oe its P ted B ractors Ciret “ run by Ne pu Se Se Fac iculs ars free: cialty Co a y on sight Colur r no ft a building Py? Free. As- oo Co., 231 Davis B ry prices. Paty os Box 72D, East Liverp bia Spe irand Rapid , 314 A. B. E =oes Square, Somervi LIONS kk pool, Ohi \ AGENTS, Mak ids, Mich . AGENTS W erville, new $5.00 Che ont by forgery Wor er: "ioe a $5 an hour: Rapid Pats h - het Wanted—For Red D three colors ee Ang perforates, ir - rful pe ‘ ~4 ; “ of ae 9 api epairs large mt og Tube chine n4 quals work o nks if P wire, write at of profit If ye . tures urgest blow-« ube Fi . - of $60.00 n Oak ke wire. write at once to RX... teres without Th + uae ow -outs ox tom 1 oe prive-year muarantes pfii-00 ma NEW NW rte, Fair- oa ration sells it : Startling letails and free erritory. Write q — Oo wee wh Soh larvelous Seif-lichtine G E 1 can't stand “‘big ; 300% profit If poration ’ a trial. Safety e quick tor = ‘ demonstrati ghting Gas lighte oxclusive territ money,’’ don't 4 Dept. P, Grand Devices Co : : Rapid Mfg oo ~~ De ~ r Products Co.. M Ty Samples free a \GENTS—Good a Rapids, Mich Arte k - Co., 799a Broad ete . Marion, Ind ‘Auto | selling “‘ vood salary a vil ‘ ™ yadway, New SELL : gears Ratskyll.”’ nd commission = If } want good live Oversi 1 Beautiful $7.00 exterminator; re — rat and ton \ A good live : ized har Red q ady =f ! e - get the business oe Aang fellows who $3.50 Co oe made Fount te a Black eaeees non-poisonou “4 pow # no bait re t , 8 ne > s or oe »ns side pre 8. ode Lo ne it. I'l gladly rende me how others are Post card bri soul $1.75. With bo ons for Co premntees( ein ff lents die out c rT Geo. F. Baker Stee” Boosessry © sample, at whol full details, or c Ss , 1549 N. Wells, Dept sinpire Specialties : g. Popular M Mer. Classified Ad- Co., Dept. P nolesale price. J 0. D AT Last—W ; 1. Ch Il Mechanics 4 r 1 . P, 117 So. Firs ohnson Pe ch 7 orld’s Gre a TAI a Magazine, I First St. Rockford. : ine. Almost hut ows atest Adding Ma = ——— — ° qua * iF e a ore ILORING | Salesmen ing pr — it Tremendous = - Five adver AGENTS aueolalay nollnn 3 Adams, ave Send for a we cleared $1,150 in’ 35 territory ee trial offer. tor money now. > y4 salesmen get thi . Co., Dept. 4B, ey —_ Nichols lator_Corp Yept omen. - om g Cal yutfit f ( et us sts ris oe — e s u irar aa 1 ee eaneze and a you in oF Pn Wanted. Yo , $100 00 WEEKLY : ——_,_e Mfg. | eatn S10 SS: nny aed ae et ee newly patented ‘¥ and over. Selling g Au omobilists Ae eaneze sells te : iractical insur siness. We teac sample and partic - tm specialties { Repeats » Offices, public buil a yearly No capital pte Earn $5 ene. - 1351 16th St 1 - sony J ackson Mfg ant timer ; “a. vee over and over uild Dept. M. Roo al required ites ¢ ».00 BIG Yenver, ¢ fg. « ing n. Pa quest Gelbach. Man ~ ree Jersey Cit x oat 215, 75 wD, me - eel re nee and fast . nid f CALIF - — . ger Y - y St., ys sox nitta for galery if a IFORNIA Rosebeads GOLD X-Ray N = $1.50. make $1 44 his a - Big Agents coi reads selling lik lusion! See t Novelty The easy. Samples profit tim py Brofits. § Catal ae ges og ~ inside a fg bones in your = i Monogram Co. Me sntormat M alog free , stu “ ‘ neil, ete vat } ; ept " 19 No. Halsted Ch _ Mission Factory profit. Samples ete Rapid selle 1, lead t. 1 . Chicago, Ill stamps or coin and particulars for e. , taret 1 r an t Third Ave., N : Novelty. Co. 98 en fee y * i mer e pack | De is 404 Am

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See Rhee See eee, YPELEU 42 POPULAR MECHANICS ADVERTISING SECTION

MAN in each town to plate auto parts, WONDERFUL! Startling! Amazing! Our GET into the tafloring business. It's one reflectors, bathroom fixtures, refinish beds, Ex-Cel Luminous Crucifix and Magical of the most profitable of all lines the mirrors, chandeliers; by new method No (Luminous) Necklace shine brilliantly in the selling tield—particularly when you are ¥ capital or experience required Simpie plan dark. Sell on first demonstration. Big profits diing a good line of goods at a pri hat of manufacturing at home starts you in big to you. Write for further particulars, or better meets and beats competition. Our line does money-making business Outtit furnished. still, send for sample and territory protection it It offers an exceedingly fine line of Free particulars and proofs. Gun Metal immediately. Crucifix $1.50, Necklace $1 00. men’s tailored-to-measure clothes at a very ce \ve. H, Decatur, Ill. pores. bef Hannan Co., Dept. B, 57 attractive price, with a liberal pr t KU-KLUX-KLAN lucky Kluxer pocket- 7 st t.. Chicage the salesman and a Ilbberal cash bonus be. piece and Katalog 10c. Agents making big YOU can be your own boss with our Key- sides for good work. Back of the iine j & & a money National Emblem Company, Box Check outfit. Good for $5 a day stamping house of unquestioned reputation ar re 1174-PM, Omaha, Nebr names on pocket key checks, fobs, etc. Sample sponsibility, giving unequalled service ang TO secure agents or salesmen or for selling check with your name and address, 20 cents real co-operation to the salesman. We ¢, (want) ads in largest newspapers and maga- Pease Die Works. Dept M. Winchester. N. H use a few more good men this seaso t zines. Price list No. 30 sent free Ankrum INSTANT Weld Kepairs largest punc- they must be good This does not mm Advertising Agency, 20 W. Jackson Blivd., tures without cement or heat Lenn’s profit cy! mean = —— — > experir Chicago, Ill. The largest classified advertis- one day, $56 Write quick Free sample; yut they must be honest, ambitious and ing agency in the U. 8S territory going fast ourists’ Pride Mfr ing to work hard to make the most . WASH Clothes the new way Use the Co., Desk T, Minneapolis, Minn ee ae hg give them lf you 7 Torrent Automatic Washer. You will be | EARN $10 daily silvering mirrors, plating yourself to be such a man we'll be ¢ delighted. Special offer to one in each lo- | and refinishing metalware, autos, chandeliers, | —_ a. ay — oe — eae = Be el cality. Storm Royalty Co., 3610 Enright bedsteads, headlights. Outfits furnished. FE. | © Dear from. us pare you fe our 1 Ave., St. Louis, Mo Decie Laboratories, 1133 Broadway, New | — h ag og? promptly. hen you write A BUSINESS of Your Own—Make and Yor hp Sy, West Ad aad we goes = ago, | Sell Chipped Glass Name and Number Pilates, AGENTS sell Wolverine Laundry Soap = est Cams treet _at Peoria, Chicag Checkerboards, Signs. Large Booklet Free | Wonderful repeater and good profit maker. | , SALES Representative wanted for E. Palmer, 512, Wooster. Ohio. Free Auto to hustlers. Wolverine Soap Co. — a coiane tiene ga TURN your spare time into dollars sell- } Dent. B37. Grand Rapids, Mich. _ ~~ -. Ry, anna ta ‘Con ane :" ing Polmet Polishing Cloth that cleans all | EVERYBODY uses extracts Sell Duo | ton. M ~oo mated, oo Commercial, 5 metals without liquid, paste or powder Re- Double Strength Extracts. Complete line ~ SaaS IEP Sar EER -- ; tails 25¢ ,, Our agents say it sells like household necessities. Big repeaters. Write —— , advertising pencils. Big p hot-cakes Prove it yourself with free today, Duo Co., Dept. El, Attica, N. Y auber Pencil Works, 740 Hodapp. Da sample sent on request F. C. Gale Co., ta —— 2 specia : on —s | HIGH GRADE SALESMEN WANTED _ | (iostiny ctories, public institutions ard ‘SELL 8 an Overalls rect t . 7 — - = , : 2s <7 Rpem we SELI Da I very Work. fidh be aioe COULD You Sell a $40.00 Suit for $23.50? building owners of all kinds. Products ¢ time. No experience required. Big variety You don’t have to have experience in selling tablished over twelve years among thou dress shirts with splendid line Union-made clothes or any other selling experience, for of largest users, including U. 8. Governmer work and flannel shirts, overalls, coveralls that matter. We'll give you a powerful. Immediate big earnings and promotior nd khaki pants Write today for free impressive selling outfit and careful and $100,000.00 company to ambitious capa selling outfit. The Nimrod Shirt Co., Dept complete instructions. We'll train you in a men. Write at once. The Colorcraft ( 8. 4712 N. Kedzie Ave.. Chicago ; way that will assure you earnings of $75.00 pany, 925 W. 70th, Cleveland, Ohio ~ : to $150.00 a week or more right from the oT UTO Accessory Salesme valli AGENTS make 500% profit handling auto | start, provided you’re honest, thoroughly de- AUTO : egg : a gemee oa monograms, window letters, transfers, nov- pendable and willing to work hard. We’re ularly on dealers acer eae 4 elty signs. Catalog free. Hinton Co., 1153 an old established house of unquestioned as territorial — oe of De . N. Wells St. Chicag: reliability. We're particular about the men te — ae PR ag Bo CAN you sell to colored people? Write, = a “— sg ogy —71 — Bronzo . lumina Corporation, 212 Wi Eston Co., Dept. 101, 2500 Second Ave the house you work for, let us hear from 5 f Y Rirmingham, Ala. 7 you and tell us all about yourself. Address | ter Avenue, Buffalo : Dept. 424, William C. Bartlett, Inc., 850 GOING West, East, North, South “4 big ante fast applying gold ini- | West Adams Street. Chicago | where ‘Kly Giare’’ will take you tials to autos very owner buys—$1.: & -- = a a . - a ; ing Through’’— k sale 4 se SALESMEN—A quick selling news service | woman Smiling rrough Quic n ay RS 50 + iy and .—~: for retail stores Liberal commissions; free | every motorist; unusual profits. Samp!« 1? EF: : ae nN j sithogram o., Dept selling outfit; future for right man llus- | Franklin Company, 1508 Kasota 1 =. — = sy "Ho rT 7 trated Current News. New Haven. Conn | Minneapolis MAIL-C€ IE ouses anc Jistributors — we termes tation | - = eal We pack French made beauty creams, face “ a — ounes — 1 PAY —_ $60 to $100 ' week to - powders, perfumes, toilet preparations with ine of luggage on commission basis only; | my business in their home terri vour label Chemist, 944A North Clark, no advance; monthly commission settlements; | Amazing new kind of brush waves bobbe Chicago , . references required Petersburg Trunk & | long hair as it brushes Millior SLL he Li Quick aT Special Bag Co., Petersburg, Va women and girls read my advertising i SELL the Livest, Quickest Selling Special- e _ . national magazines and are eager to <« ties Ever Known—Famous ‘‘Hahway’’ self- DISTRIBUTORS — Tremendous _ Money this astonishing brush. Over 300,000 lighting pocket Cigar Lighters and Gas Maker Revolutionary Electric Soldering last year. 80% cash profit for you the Lighters. Low Prices. Easily Demonstrated Iron. Operates from Dry Cells or Storage ute order is taken. Write today for tert Sell to Dealers. Employ Sub Agents Ex- sattery Solders Instantly. Complete Kit tory franchise. Wavex Company, Dept clusive Territory. Make over 100% Profit retails $2.00 only. Rapid Fire Sales. Pro- 0 So. _ Michigan Bisd., Chicago P. Bernhardt, 148 Chambers Street, New | tected Territory. Write Regent Mfg. 16 | — — ———— York. ; Trinity Bldg. Boston. Mass. $100.00 A WEEK profit permanent bu — 7S 3 ; -_ | of your own ~aaey rights. No com tino wonder scant car hy at Mill prices assures good income weekly Carlin Laboratories. Broadway Bidg., whole time. You don’t have to telk: if she No investment. Write Maisley-Payne Mfg. waukee _ Wis. a r doesn’t buy at sight, leave sample; she will Co.. 20-5 Sudbury Street. Boston Mass BEST Seiler. Jem Rubber Repair ft be looking for you long before you are able | MR. BRUSH Salesmen—Old established | tires and tubes; supersedes vulcanization i to make the rounds again. Samples furnished | New York Brush Manufacturers require the | sasing of over 800%; put it on cold, , free. Premiums for your customers. Exclu- | services of men in all territories to sel! canizes itself in two minutes; guaranteté 8 sive territory Credit given. Empire Special- | ¢ siv li of Sanita Twisted to last life of tire or tube; sells to ever Cc 1549 N. Wells. D 101. Ch their extensive ne anitary : s 4 aan ties Co, 1549 Wells, Dept. 101. Chicago. | in Wire Brushes by pay layger emi me a os —— — ro BIG Money and Fast Sales. Every owner sion than any other Brush ouse in the culars ho 0 eg mone oe hi buys Gold Initials for his auto. You charge country. Write immediately for our propo- sample. Amazon Rubber Co., Philade!p!* $1.50; make $1.35. Ten orders a day easy sition. Wire Grip 4% Brush Corpora- Pa., Dept. 510 ; Write for portoutan, ¢ and free samples. | tion, 15 Mercer St " SALESMAN: If You Think in Terms — te Co Dept. 40, East NEWEST Invention: Sells Every Office. $6,000 the First Year, Write Me. Strong a ieieke - home and store. Automatically takes slack | line for retail stores. Nationally advertiseé \GENTS: Big Profits. Best and cheapest and kinks out of cords on telephones, elec- Established concern has unusual opport nit window letters made. Easily applied. Dime tric irons, Radio Receivers. $25.00 Daily Liberal weekly advance to producer brings five samples. Particulars free. Stal- Sample on approval if requested. Neverknot, | R. Williams, 1922 Euclid Avenue, ‘ nt brite Co., 1115 Second Ave., New York. | Dept. 61, MeClurg Bldg., Chicago ' land, Ohio, Dept. 200

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ALIF ORNL. \ SOS OSes Se POPULAR Tire Manufacturer wants ven and agents on commis- represent and sell one of the f tires on the market today sands in use New plan iild a business with income 100 to $10,000.00 a year, one money-making opportunities yy a well-rated, reliable com- quick before territory is as- e one else. Simplex Tire & 2035 So. Michigan Ave., Dept. Lil n remover, nly two liquids, automatic Nothing like it No Want high-grade men with teen-karat Knockout Write Valve Co., Plattsmouth, Nebr adver- The Street, Forty ? See our 149 of this issue ompany, 2137 Main Old at page ul © Ohio ti N—New spec prospect; St. Louis St. Louis, — ELN—Calling on Just out; "ev- daily possible Novelty Co., 1504 Mo. butcher grocers, bu laity, $35 Sell pricecards, post 0%. State line, territory. m Co., 116 John St., New York new paved road maps, handy in- le for advertising and premiums _ Full or sideline position n request Ge Cram rth Market St., ¢ »AKR Salesmen Wanted h-grade exclusive ¢ Protected territory Li id promptly each week Y Experi- H et al com Ofter- Works, Buffalo, N \SIBLE representative wanted rvelous Pocket Cigar Lighter ent’s demonstration to consum- ers Big profits and excl ht Send for particulars s Enclose 5c st ps M Masterlite Co 110 w York Radium Health Products—enor- exclusive territory and big prof Applicator Co., 9 Radium SB i MEN If you are making a cent ) weekly, you owe i yourself to investigate this pportunity men earn $300 to $1,000 month- improvements eliminate com- ur new product Selling plans thousand-dollar- onth en ngs of salesmen To secure na- tribution of new line in short offer ground-floor opport ining sales force now H special monthly bonus, exclusive Write today for proof Depart- C. A. Bidg., Los Angele ESMEN—Our Profit Sharing Plan increase in your earnings on our guaranteed Shoe line at popular t to wear—sure repeaters Lib- ition. Working outfit free. Ter- ng fast Big opportunity to build f your own Write for particu- Shoe Company, 701 East Lake nneapolis, Minn MILES on 1 Gallon Wonderful Vapor for autos 1 free to introduce. $1 Wheaton, Lil Salesboard That Takes of a slot machine Something ite for particulars of this inter- profitable Salesboards Scheerer Ave business of operating Square Hole Board Newark J ILORING Salesmen Our guaranteed nd $31.50 all wool tailored to order 10 to $20 cheaper than store prices- ssion in advance. Protected territory f sortment 6 x 9 swatches free Dept 1959, 843 Adams, Chicago rders for shoes direct from manu- wearer Experience unnecessary part time. Mason Shoe Mfg. Co., Chippewa Falls, Wis PRESENTATIVES Wanted To sell motor fuel. Territory to respons- Will save % gasoline Will rbon. Karbonol Chemical Co., St. Ohio \LESMEN to sell cx complete line of Ad- Thermometers; liberal comr sion Thermometer Company, East Street. Springfield, Ohio A WEEK Genuine Gold Let- store windows. Easily applied amples Liberal ~ to general Metallic Letter Cx 438-D North “hic AO A Rosebeads selling like hot Agents coining money Absolutely profits Catalog free Mission SP, 519 No. Halsted, Chicago, Il MECHANICS ADVERTISING A MOST Successful High Grade Household Specialty is being introduced by an estab- ished national concern which offers open- ings to salesmen and managers who can or- ganize specialty salesforce Splendid earn- ings. Write immediately, giving qualifica- tions. The Kitchen Kraft Company, Dept 0, West Bend, Wis TAILORING Salesman ~ $100-$150 week selling Union hand-tailored made-to-meas- ure suits and overcoats $23.50-$29.50. Lib- eral commissions advanced. Wood & Co., 651 So. Wells, Chicago. EASY to Sell Groceries, Paints, Automo- bile oils, roofing, to consumers from No capital or experience necessary able, steady, or part-time work c sion advanced Satisfaction guarantes 1: 53 years in bus iness. Write for particulars Loverin & Browne Co., Wholesale Grocers, 75 So. State Street, Chicago, Il WANTED—tTailoring Salesmen, make $60 to $125 per week. Biggest merchants in many We are the tailoring house in towns have started with our line largest made-to-measure the country, furnishing elaborate sample equipments, including 500 all-wool fabric su make your own profits from $8.00 to $15.00 on each order. Guaranteed absolute satisfaction, perfect fit, best workmanship, or no sale. Write for line and all acces- sories to be sent free. Tell us all about yourself. Address N. O. Perry, Sales Man- ager. Box 483. Chicago. Ill MAKE $100 Weekly in Spare Time. Sell what the public wants—long distance radio receiving sets. Two sales weekly pays $100 profit No big investment, no canvassing Sharpe of Colorado made $955 in one month Representatives wanted at once This plan is sweeping the country—write today before your county is gone. Ozarka, 802 Washing- ton Blvd., Chicag SALESMEN—Bec your business; ing our $7,500 dent, $25 Sick Weekly Benefits; yearly; other amounts proportionate inteed steady incoine from renewals leposited Insurance Department tion Dept. A, Newark, N. J SALESMEN Can make $5.00 a ing our Calendars, Pencils, tising Novelties, Yardsticks, Whistles, etc Liberal terms Seils entire year Fine side line Local and traveling agents Model Calendar Co _Dent 226 uth Bend. Ind yme experience Accidental Own sell- Acci- $12.50 Guar- $250,000 Registra- Independent unnecessary ; Death, $50 day sell- Signs, Adver- WERE You Ever Offered a Grocery Store? Our proposition is better 1 can_ handle flour, canned goods, dried fruit, coffee and entire line of groceries as well as _ radio sets, paints, roofing and automobile oils and tires with no rent to pay; no ney invested, take large orders from samples Goods are guaranteed and proven quality Selling experience not necessary Steady, profitable work for ‘‘workers.’’ Address Hitchcock- Hill Co Jept. 226, Chicago, IIL Reference: Any bank or Express company $50 DAILY Selling Salesboards—Make up to $33 on single sale, selling largest, lowest priced line; no samples to carry; write for 3-color catalogue and full particu- lars Lincoln Sales Co., Dept. E, 212 N Sheldon, Chicage TRAVELING Salesmen | calling on retail stores wanted by large manufacturer to sell unique line of business-boosting articles Year round, fast selling, main or side line If not earning $150 weekly, address Elsaser Works, 2 Charles St., Boonville, N. Y SALES Sideline pays five to ten dollars a day taking orders for Specialty printed gummed advertising and Match Box Stickers Write for proposition, samples etc today Beardsley’s Printery, Rock Island. Tit FOUR $7.50 sales to $20.00 daily Sayers field Ave., Chicago, Ill BUSINESS SERVICE FORMING a company? Look Common Law plan of organizing Dec dacation of Trust Its are outlined free merchants net you Systems, 2803 Shef- into the under a economies and fully in pamphlet upon request 8S Demaree, publisher standard legal TOS Walnut. Kansas City, Mo DELAWARE Incorporator. Charters; Fees Susi; forms. Chas. G. Guyer, 901 Orange St.. Wilmington. Del BRANCH Office in month M 221A Ni HELP WANTED 5 MONTH s. Salaries blanks, Washington, D. CG. nil forwarded promptly rtheast $158—$ Postal Cler ulars free Write tute. Dent. D-t8 MAKE big Silvering M Instructions John Wik Become just raised today Franklin Rochester. N. ¥ money at Railway Partic- Insti- home Spar time rror making signs, novelties 50 cents. Particulars for stamp zynski, 31 Regent, Buffalo, N. Y. SECTION BIG Raise in Postal Selaries Become Railway Postal Clerks. ($158—$225 month City Carriers—Postoffice Clerks ($142 $192 month.) Rural Carriers. (Average $175—$255 month.) Men 18 up ness, work Life positions Vacation Sample coaching and full particulars free. te today sure Franklin Institute, Dept. D-3, Rochester Y HOTELS Need Trained Men n- wide demand for high-salaried 1 past experience unnecessary We trai } ) mail and put you in touch with big oppor tunities Big pay, fine living, interesting work, quick advancement; permanent Write for Free Book Your Big Opportunits Lewis Hotel Training Schools, Suite S-3 51 Washington, D. ¢ EASY Money! Silvering mirrors, Auto- part tableware, Outfits; Plans Free Sprinkle, Plater 287, Marion, Ind THIS Means You.’’ Read Surety Servi Company's Proposition! Agents Wanted ('lassification EASY money applying gold initials mon grams on automobiles Anyone can do it Simply transferred from paper, takes 1 minutes Make $1.50, cost % Sample free Raico,’” 3258 Harrison, Sostor Mass GET posted—Good prices paid for butter flies, insect See Sinclair display adver tisement, page 22 FIREMEN, Brakemen, for railroads neat reir home everywhere: beginners $! monthly (which position?) Railwa Assocation Desk M-1, Brooklyn, } y ABSOLUTELY no competition selling Va Style millinery Live wires earn $50 t a weel Write for liberal offer and excl sive territory Val-Style Hat Co., 767 V Style Building, Cincinnati, Ohio BE an Auctioneer 4: from $10.0 to $100.00 a day Send for free illustrat catalogue als how to htate The H Study Course free of charge Reppert Au tion School, Box 51, Decatur, Ind $158 25 MONTH Become Railwa Postal Clerks Particulars free Wri Franklin Institute, Dept. D-18, R N. ¥ SEEKING Home Work? Write Institut 11 Water, New York BUILD splendid business making chip; gla number and name plates¢ lallion Write for particular p Utility Co 11 Broadway, New Yo Are Wanted Government J $95—$225 month Steady Sample cova ing free Write today sure Franklin I: stitute, Dept. D-18. Rochester, N. ¥ NEAT Handwriters wanted et once ; Day up Send stamp for particular Rus! Dakota Employment Agency, Dept. 28, Lead Ss. Dak AGENTS—$16.50 Daily Easy Big Ne Seller. 6 irs Men's Hose guaranteed 12 months Going like wildfire You simp take orders We deliver and collect Y Pay Daily 19 styles, 37 colors Maco Textile Company, Station 2606, Cincinnat Ohio TRAINED Sales Get $1.500 t $5 year soys—inen ip Experience inexperienced Big demand for trained (traveling and local) during Spring Le it home while earning Sample lecture fr Write today—sure Franklin Institut Dept. D-77 Rochester, N. Y RAILWAY Postal Clerks, $1900-$2 Postoffice Clerks, Carriers, $1700-$2200 a Thousand nually appointments annual Many other lifetime penings Co educatior ufficient Experience unnece sary Particulars free Chicago Civil Ser ice College A-4 Kesner, Chicago $158 > ye Salary just raised Become Railway Postal Clerks Men, 18 Steady work. Full pe one oo free. Wri today Franklin Institute, Dept. D-1s8 Rochester, N. Y FIREMEN — en, Saggage Sleeping car, train porters (colored) $140 $200 Experience unnecessary 810 Rai way Bureau, East St. Li uis, Ii! WANTED—B Men Learn Auto R pairing $30.00 week Sample lessor f Franklin Institute, Dept. D-400, Roch N. Y LEARN Bricklaying in a School ru Building Contractor Circular Free sociated Building Employer 15 B. I Building, Grand $170-$225 MONTHLY, Railway Post Clerks, Postoffice Clerks, Carriers, $145-$192 month. Customs, Internal Revenue, Depart mental Clerks, $1,500 up Information free Chicago Civil Service College, A-141 Ke ner Chicago MEN wanting forest ranger, railway mail clerk and other govt. positions. Write for free particulars ver, Colo, Mokane, Dept. A-12, Den-

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Sans VSe CON

44 PUPULAR U. S. GOVERNMENT wants l $1,600 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, other branches. Write today for booklet, Dept 8, Patterson Civil School, Rochester, N. Y EAKN men 1,400

and free Service

weekly, spare time writing for newspapers, magazines Experience un- necessary. Copyrignt book free Press Syn- dicate, 981, St. Louis, Mo MEN to build. radio sets Leon Lambert, 9-H MEN—Age 18-40, wanting tion-Office positions, $115-$250 transportation, experience unr Baker, Supt., 41 Wainwright EARN $10 daily silvering and refinishing metalware bedsteads, headlights Decie Laboratories, ork SILVERING Miri ily learned; Address, Wear Springs, Mo OUR genuine are an_ excellent In Wichita spare time Kan Railway month, free ary. Write Louis mirrors, plating autos, chandeliers, Outfits furnished. E 1133 Broadway, New Sta- 1ECESS St

~ Bas- Plans free Excelsior French plate profits Mirror Works, Mirrors, immense

gold window sign letters money-making proposition for handy men. Slann Sign System, Bethune Ave. E.. Detroit, Mich ALL men, women, boys, girls, 17 to 65 willing to accept Government Positions, 117-$250 traveling or stationary. Write Mr Ozment, 101 St Louis. Mo.. immediately STORIES, poems, plays, etc are wanted for publication Good ideas bring big money Submit manuscripts or write Literary Bureau, 522. Hannibal, Mo MAKE money writing tails free to beginners course. Producers’ League St. Louis INVENTORS desiring to should write for our book ‘‘How to Get Your Patent,”’ tells our terms and methods. Send sketch for our examination and Instructions without charge. Randolph & Co., Dept. 418 Wachington ¢ Photo-plays; de- No_ correspondence 230 Wainwright,

secure patents

INFORMATION INFORMATION, New Yo Representatiqn, mail address acted, Guide Photos Adamec, 180 Harman St Brooklyn N ADVICE on any subject $1.00. Universal tureau, 3610 Enright, St. Louis, Mo JUST Out—A New Boy Mechanic No. 4—1,309 Articles, 1,520 Pictures how to make such things as Radic ers, Toy Airplanes, Pusheycle, Canoe toons, Diving Rafts, Electromagnets Wagon and Ice Boat, Catamaran Picture Camera, Sidewheel tor-Driven Sleds Camp hundreds of other Price $2 postpaid

rk, Vicinity; susiness Trans- taken; Reliable

Bi 0k Motion Motorboat Mo Equipment and interesting devices Send No Money. Simply write a postal, if you live in the VU. §&., saying you want Boy Mechanic Book 4 When the postman hands you the book, give him $2 plus the few cents postage Popular Mechanics Press, 200 E. Ontario St., Room 806, Chicago Ill COMPLETE information « on any book pub- lished Or will supply lists of books that are the best on any subject Information is free Room 806, Popular Mechanics Build- ing. Chicago, Wl WHAT Is Your mation, advice Any subject $1.00 formulae, supply sources International formation Institute, 15 Moore, New York AUTO Tourist’s Handbook —An sable help for those who wish to make a motor trip. Tells how to prepare your car for the long grind to avoid trouble, how to make and use camp equipment, how to cook on the road and how to make comfort- able sleeping quarters Vill reduce your touring bill many dollars if you follow the ideas presented With this we give ‘‘Auto Owner's Handbook’’ filled with helpful ideas for drivers Send no money Pay the postman $1 plus postage when he delivers the two books. Popular Mechanics Press, Room 806, Popular Mechanics Building, Chicago, Ill. ARTS-CRAFTS lamps, articles, Three Problem ? Expert infor- Also In- indispen- to make metal etched art objects hooks. Send postal, if you live Library—How decorative lamp shades and many other useful cleth-bound pocket-size No Money. Just write a in the U. S& When the books arrive, ex- amine them, and if you are more than pleased. pay the postman $1.50 and the few cents postage Popular Mechanics Press, Room 806, Popular Mechanics Building, Chi- cago, lil. LAW Any ener Powers, question Box $1 Roxbury answered 191,

Seriv- Mass. MECHANICS ADVERTISING COMPLETE, subject $2 formation Rapids Accurate, Information on any Prompt Service National In- Bureau, 1429A Milton St., Grand Mich

UPHOLSTERY SUPPLIES your own Mohair, Tapestry, and cut to size Moss, Cotton filling Free instructions for doing work State your wants and we will quote prices and send samples Enclose 2% stamp Cushions of all kinds made to order. Witt's Upholstery Shop, 1694 Grand Ave Paul, Minn

DO lour, Leather Upholstering. Leather, Ve- Imitation and Hair St.

MAILING LISTS

COMPLETE list over fifteen thous and automobile owners Philippines only $5 Lest buyers all lines Philippine Sales Agency, Manila, Box 2372A 1,000 NAMES of men living in rural vil- lages in So. Dakota $3.50. N. 8S. Co., Box 327, Pierre, So. Dak FREE, 2,000,000 addresses, 100% correct Write Institute. 15-A Moore, New York 1,000 HOUSEWIVES’ names, $1.00. Just compiled Ted Goertler, Dalton, Nebr _PHILIPPINE Government Officials and Employees. Good salaries Permanent service Americans, Filipinos Over 15,000 names $5.00 Philippine Sales Agency, Manila, Box 2372A eaitenines BUYING Agents and Buyers’ Letters. Also Rent; Sell Acey Smith, Detroit NAMES—postcard views. Ben Meyer, 35 West 3ist, New York.

TYPEWRITERS AND SUPPLIES

UNDERWOOD Typewriters—only $3.00 down Easy monthly payments Low prices at less than manufacturers. 10 days’ free trial. Rebuilt, all worn parts replaced. Just like a new machine 5-year guarantee. Write for big free catalogue A-151 Ship- man-Ward Mfg. Co., 1515 Shipman Bidg., Chieago, Il TYPEWRITERS All Makes Save One- half. Thoroughly rebuilt in our factory by the famous ‘“‘Young Process.’’ Fully guar- anteed. Free trial. We handle all standard makes. Cash or sold on easy terms Write for catalog Young Typewriter Co., Dept. 5756, Chicago, Hl TYPEWRITERS, all standard makes, $10 up Fully guaranteed Free trial Write for complete illustrated lists Northwestern Typewriter Exchange, 121 N. Francisco Ave., Chicago PRINTING,

ENGRAVING AND MULTI- GRAPHING and address printed of high-quality linen-finish paper and 100 envelopes to Choice of the following colors: Blue, Pink, Gray, Canary or White As- sorted colors if desired Just send your name and address (write or print clearly) with $2 (West of Denver and outside U S. $2.10), and this attractive box of per- sonalized stationery will come to you neatly packed, postage prepaid Your name and address will be printed on each sheet and envelope in steel-faced gothic type in rich dark blue. Money refunded if you are not more than satisfied Send in your order today. New Method Stationery Shop, Wheel- ing, W. Va $3.00 DELIVERED, 500 Watermarked Bond Letterheads, 84x11, and 250 envelopes, money with order Job Printing Specialty. National Printing Company, Goshen, Ind. 225 BOND ietterheads, envelopes, bili- heads, cards, $1.25 each. Combination, $4.00 Economic Press. Leonia, N QUALITY Printing! Reasonable Prices! Send for Free Standardized samples and prices. Folders, Circulars, Catalogs our specialty. Ernest Fantus, 525 South Dear- born, Chicago Lie MULTIGRAPH — Model 36 ments used once; Autofeed. E. B Louis, Mo. ae “NEARGRAVURE” ferent—Unique—Samples stamp. Knox, Ind a Re . es “EMBOSSERS: Print your note heads and envelopes with a hand embosser. Particulars

YOUR name double sheets correspondence match for $2 on 100

all attach- also Multigraph Press with Mason, 604 Olive St., St. It’s dif- Solliday’s, Stationery-

free. Hazzard Company, Box 1, Vanderveer Park, Brooklyn, W. F. : NAME, Address and Monogram (if de- sired) on 200 sheets letter paper and 100 Envelopes, $1.00 Satisfaction Guaranteed. Nuss Specialty Printing Company, North Wales, Pa BUSINESS Cards—Vellum Finis h, 4 4 type lines, 100, 50 Windermere Press, Box “7. Fast Cleveland. Ohio DISTINCTIVE Printing! Samples for stamp. Franklinpress, B-32, Milford, N. H T

SECTION 5,000 AD Slips, 3%x5%, 150 word Imitation Typewritten Letters, 1,000 ¢ 2,000, $9.00; 5,000, $16.00. 5, 004 Circulars $9.00; S%xll, $15.50 } all sizes, low prices. klegant samples fr, Good's Prinvery, Harriso..burg, Va 500 PRINTED Enuveiopes, $1.60, 1 Satisfaction guarauwteed. Bibb Py Company, Gordonsville, Va 150 EACH—Letterneads, ness Cards, $2.00. Amos F airport, N. ¥ & 250 bOND lewerneads and envel pe 500-—$4. 00 Bullers Printing Co 0 loosa, lowa HAMMERMILL 250 each, $3.00 Brinkley, Ark ~ 1,000 LETTERHEADS or Envelopes. $ Sent Prepaid. Samples Free. Monitor P Morrisville ae nas $2.00 FOR 125 Letter Heads, 8% x 125 Envelopes Bond paper. Delivered fi cash. Pershing & Co., South Bend, | GUMMED Labels, , Name and Addr n00, 2 lines 30c, 3 lines 50c Cat Eastern Label Co., A, Clintonville, ¢ EMBOSSED Stationer Business pice for Stamps. Daniels Company, Pitt Envelk pe B Sullivan, | ~ Tetterheads, enve Dixie Press, B = - — — _ WE “print Stationery, Booklets. Cat LAA Circulars Samples. Commercial! Pre Batavia, Ohio PRINTING OUTFITS AND SUPPLIES COMPLETE printing outfits, ink, paper supplies Press Co., C-11, Meriden USED Printing Presses, List free Norfolk Press lentine, Norfolk, Va ~ PRE-USED Printing I supplies List for gains, Richland Pa PRINTING Outfits—Presses, type novelties Send stamp Model Press, York, Penna DUPLICATORS AND DEVICES -s SPECIAL anteed to cypowrditen xll, $1.85, re md du Lac cS “Gh ONEY STENCIL Duplicating Outfit $3. 00, $4.00 Complete. Typewriting |! writing Returnable. Primos & Co., 3-M, Primos, Pa YOU can make 50 letter, notice, ete., on a Heyer Quality free trial offer. The Heyer Duplicator ( 14 S Wells St Chicago VW ADDING MACHINES VEST Pocket One—accurate

presse Write for . Grand Rapids. M FOR SMOKERS Pounds fine old Ky. Tobacce with age, at the following prices, p tage: Hand picked chewing, $5.00; & Smoking, $2.00; Mild Sweet Smoking First order means your future orde prove it Van Zant Leaf Tobacco A tion, Van Zant. Ky.. J. W. Seraer A BOATS AND LAUNCHES BOAT Building Plans ing, sailing, speed, The Rudder, 9 16-FOOT Adding M Multiplies \ $999,999. 99 Fu Make

TEN

for amateur R Uv cruising Free Murray Street, New Rowboat—easily made struction biueprint 30c. Weesho-t Office. Detroit. Mich S NEW Boat Book telling how to 0 kinds of boats Also many ideas on boating Profusely With this we include the big door Sports the Year ‘Round.’ for making all sorts of devices for recreation Send No Money, if yo the U. 8 Simply pay the postman * PI cents postage when the Popular Mechanics Popular Mechanics B x the few delivered S06 Ii) Room Chicago,

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wee VEE SYM, SEGS0NTU, WHEL G

aah SOVEER TP BALE ROMS, VSR SELECT, SPU GI, .¥, As vol, VOW POPULAR MECHANICS ADVERTISING SECTION 45

0 = that always go are propelled by BAND and Orchestra Instruments—All INVENTOR’S Universal Educator, con- ) Ford engine booklet free to makes of new and used instruments sold, tains 900 mechanical movements; 40 per t Harry Rider, 201B East exchanged and repaired Standard and petual motions Tells how t tain and I ith Norwalk, Conn popular music sold Write today for cata- sell patents Suggests new ideas Explains ‘ . —— log and Free subscription to ‘Musical how to select your attorney and avoid patent RAZORS AND BLADES Booster’’ magazine Deal with the Pro- sharks Special price (for a limited time) —TRPENS dull blades Dollar Watch” aa pognee x Comme Satan Co., $1.00 postpaid Albert E. Dieterich, 621-B Pr ived problem. Outfit $1. Men- 1 Grand Ave., Kansas City, Mo Ouray Bidg., Washington, D. ¢ : f razor. LaRue, 3435 VanBuren SACRIFICE, large stock musical instru- MONROE MILLER, Ouray Bidg., Wash R : ‘ lil ments, 110 page catalog, 1x Play Jazz: ington, D. C Patent Attorney: Mechanical Printe ) ~ ye - 0 onception ) e signe an Witnesse zg. Demonstrator 30 cents. Claus, | | (PATENT Pending Wonder instrument Form, fee schedule, information free. Lan = a n Street. Brooklyn, N. ¥ } anybody play, everybody surprised Imitate caster and Allwine, Registered Patent At ¢ - 2 rchestre come profess nte or: ; > peste - S0y S for Gillette razor 35c per dozen “ 2 -- ng prose — Ne rage torneys in United States and Canada, 221 |} Other valuable information. Multi-tone Co ide hi . sive agents wanted Razo- | : Ouray Bide Washington, D. ¢ 4S Mecodwas, Mew York } 148C W. 38th, New York = ————— . it val ay. e : pe! n lis > t = - | SONG Writers having poems or melodies MILLIONS spent ue = ry Ser idee P OPTICAL GOODS | write for proposition Ray Hibbeler, D-1. Hundr« ls now wanted Patent yours and | 4040 Dickens Ave., Chicago profit Write today for free book—tells how x1] PrNOCULARS, Binoculars, Binoculars! CORNETISTS—Trombonists—-Saxophonists to protect yourself how to invent ideas fered for for every use and every pocketbook Clarinetists. Get ‘‘Free Pointers ** Name | wanted, how we help you sell, et Ameri Ir 3 $ to 20 power. Guarantee of | om_eene ~e : . vee can Industries, Inc., 500 Kresge Bldg . instrument. Virtuosi School, Con i, Mass. | w , Ad tisfaction or money back Get | VIOLINS ese hand - . | ashington. D. ( A ddre ° a price iist @ret Send for de- | LN? jenuine hand-made; sweet, > Trade : =o om — - alogue “ lar today. Geneva Optical Co } soulful, mellow, yet powerful Instruments i NTS Prade Marks D + This I St.. Geneva. N. ¥ P of finest tonal quality Free trial. John as 2s years experience and gives ex s | Lehto, 935 14th St., San Pedro, Calif ere ay Shnak wens “heiediee “Gael I FOR THE HOME | (PATENT Pending.) Wonder dollar in- | for free information amd enoct maat of ten — strument, anybody play, everybody surprised cntenn ¢, ‘bef a : - ol sean . to , iri pater before proceeding John Cata sAZORNIFE A _ seam ips — on Imitate orchestra, become professional enter- Tho + co oo2 FE Bt oe w ~ =. Pre lesign cutter and a hundred an } tainer; other valuable information Multi- ton. D. C agi - ; ; . j - ~— a oe one a. tone Co., 448C W. 38th, New York : = . . —-y Uses discarded _ ife y blade | VIOLINS. Deep Mellow, Soulful-——on PATENTS and Trade-marks btained LIES (coin) postpaid. Whatley & Co., | ; , : - *rompt service. Write for our new book on mg gg | eredit. Easy terms for wonderful instrument ratene Ex ' n 1889. I . . - B-s =~ | Get details teday. Gustav F. Henning, 2424 gig a” © ablished in 188% ». OE & ‘ UNCRETE Handbook, deseribing 173 | Gaylord St., Denver, Colo vo 9 7th St.. Washington, D. ¢ f ng concrete in the home, shop and } I WANT Song Poems. Casper Nathan, ESTABL — D 1864 Milo D. Stevens m, with full directi for doing 1252 B . . Company > Booklet Patent 1 le ee - - . " | 1252 Bryn Mawr, Chicago anh © bHookiet atents race “ yourself with rdinary tools a ; Marks Copyrights Offices Monadnoct B1—I - tions. 8 fe “‘welétes se you can WRITE Songs. Big money and reputa- Shak” Gienene’ Te + Building. Wast i it.” Price 50 cents, postpaid tron Write for information J. Gordon ingt Ow ve —— , ‘ype Mechanics Press, 200 East Ontari Pub. Co., 201 N. Hoyne Ave., Chicago engson, or fi : Chicago, Ill MUSIC Composed” to words. Bauer Bros. : PATENTS Trade marks copyrights CENTS brings you the Supreme’ (formerly of Sousa’s Band), Oshkosh, Wis Prompt, personal, reliable service. Over 36 ie Sharpener Handiest Household ar- — ee, eee Write for terms Patented A. Bohlin, 71 Mulberry PHONOGRAPHS AND RECORDS em free care 5. G. Siggers, N. | > “a BUY . . . bldg 418 St ashingtor PD. ¢ Gold Seal Record Repeater—Won- — : : ~ Ts OME Mechanics—A new Popular Me- lerful time saver. Fits any phonograph es —— pees expeneive as + Handbook containing 329 discoveries Pin one dollar to letter Order Quick — wi : operatior Booklet ( ve of value to anyone who has a | Supply limited. Address—Alfred Gaillard - 9 Creed pesation of Americas pages—203 illustrations. With P. B., 241, Columbia, 8. C — sarrister Building, Washingtor s lude our helpful new book “‘Hand- — 7 ——— _ : D. — er, X for Women.”” Send No Money—Pay _ OPI ORTI NITY, get ' Table Phonographs PATENTS Procured; Trade Marks Regi after you see them When the Ten Dollars Each. Catalogue. Sheafer Mfg tered—A comprehensive lenced, prompt ivers the books and you find that Co., Station E, Box 9, Cleveland, Ohio ervice for the protection and developr ent , H ighted with them, pay him $1 BUILD your own Phonograph Write for of your ideas. Preliminary advice Sr y Popular Mechanics Pres catalog and free BI ue-print offer Amer- | nished without charge Booklet Mechanics Building, Room 806, ican Phonograph C 0., 3752 Belmont, Chicago tion and form for disclosing idea free on les of un art, BUILD Your Phonograph. Spring Motors |} request. Richard B. Owen, 30 Owen Bid ree ee GRANDFATHER Clock Works, $5.00 a ectric Motors, Tonearms, Amplifiers, Ac- | Washington, D. © r 41-R, Park Row, \ for ir own case; Instructions free; make essories. Latest Equipment site in Radio | New York tor ¢ rofits selling your friends. Cloek Mechanism and Cabinets talog mailed PATENTS Time int ir upplying th chimes for old or new cases for ten cents. Hoosier Mfg “ee Supply Co., | for patent for full particulars. Clock Co., Ruff- 13 Baldwin Block, Indianapolis, Ind | ing your Ss Philadelphis | Me . ——— fee ee PATENT ATTORNEYS instructions LOOMS—Only $9.90 and up. Big money ; ¢t Obt tin ing Colonial Rugs, carpets, ete., from PATE NTS How to Obtain a Patent’’ vention”’ 1 waste material. Weavers are rushed is e nat of a book which every inventor hov lers. Send for free Loom Book; it should have It will be sent free upon re- Nac about home weaving and quotes quest, and will tell you what you want to . prices and easy terms on our won- know about patents It contains the whole | P ew looms. Union Loom Works, 480 story It describes the different parts of | i St Boonville. N. ¥ the application and explains in simple lan- | |! Mi HOME-MADE Furniture *opular ~ Me- guage the pr secution before the Patent Office | ! - . ‘ Mission Furniture Library tells how at tells about joint applications, reissues | LACEY'S Patent Sense Valuable book all kinds of furniture in the easiest greements, assignments, license interfer- fr See ad page 158 It is not only cheaper to make your | & es, infringements, pr cess patents lesign | PATENTS—Write for ir Guide Book t you have a lot of fun doing it patents Y x 1 prints and labe ur Record f Inventi Biank be f rary consists of three ecloth-bound | If You in patents either a ! ing inventions. Send model or sketch ie Send No Mone Simply pay 1 Inventor, manufacturer or wner of a j your “ot ention for Free I recti and Used $1.50, plus postage, when he hands | Patent you will enjoy reading this book s Reasonable See ad for books. Money refunded if not de- | Which was written by a lawyer who has had ; 157. Viet g f Popular Mechanics Press, Roon twenty-five years’ experience in patent mat- 934 Nis W hington Ml Popular Mechanics Building, Chicago, | ‘*®™S If you have an invention and will | dD. c ; ‘ a } send us a sketch, model or photograph of it : | we will promptly make a search of the | A FORTUNE may be yours if your idea — DIAMONDS, WATCHES AND JEWELRY | Patent Office records and advise you whether is commercially usable Find it before ‘ . — - or not, in our opinion, your invention i paying for patent I tell you how and help ao _ WATCHMAKERS Earn highest wages patentable, our charge for this service being you make the sale Particulars free Write lerstand adjusting thoroughly Circular $5.00 We feel that our experience of twenty- W. T. Greene, 806-A Jenifer Bidg Wa - Write Walter Kleinlein, Publisher, a years has fitted us to render prompt ing, D. ¢ Mass ar efficient service which will merit your FRED H. HAYN, M. ! formerly First A confidence . pene todas Talbert & Talbe het, ; seo ay alb albert anklet mis Patent ‘ AT tue DIANe RELICS, AND 562 McGill Building, Washington, D. C . oa 1 = “ Hi anny Bu ‘ - GooDs PATENT Procured. Prompt Service. Per- Los Angeles, Calif R OR Dens, exhibitions Relics from Eu- sonal, careful and efficient service. Highest INVENTORS: Sead sketct r model for f Battlefields Illustrated Catalogue references. Moderate fees. Send sketch or advice and exact cost of patent Ask for w Y ‘ple war photographs included), 25¢ - del for actual search and advice. George our Free book How to Obtain a Patent.’ _*tmational, 1889 Albany Ave., Brooklyn, P. Kimmel, Master of Patent Law, 54 G, Tells what every inventor should know. Es 7 Loan and Trust Bldg.. Washington, D. C tablished twenty-eight year Highest refer SEND 5e ft wr fine, 1 new - list Indian relics, PATENTS Trade marks, copyrights ences. Prompt —- Reasor word charges " firearms. F. E. Ellis, Webster Prompt, personal, reliable service. Over 36 Chandlee & Chandlee, 474 Seventh, Wash helpt Mo : years’ active practice Write for terms ington pS us INDIAN Made Baskets, Blankets, Wam- took free Address E. G. Siggers, N. U PATENT Application Blanks free to in 0 Curios Catalog Gilham, Kelsey- Bidg., 918 F. St., Washington, D. C ventors. Patent News-D. Washington, D. C ir “ : lif INVENTORS’ Guide” sent free on re- ms, RCY 8S a BSTER ~ 3 and Los USIC_AND MUSICAL INSTRUME quest; this book contains illustrations of uilding. Stockton, California ang One # : ry NTS patented inventions and gives valuable in- lished organization. Send for free book or “ . i ANO Jazz; Teaches how to play by Ear formation and advice for all who have oric Patents 7. | all the very latest Novelty Stuff. inal ideas or improvements. Frank Leder PATENTS. My fees in installments Ad au ulave Free Write Piano Bill mann, Registered Attorney and Engineer vice book free Frank Fuller, Washington “"\4 Osington, Toronto, Can, Woolworth Bldg., 1712, New York D. Cc

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46 UNPATENTED Ideas Can Re Sold I | tell you how and help you make the sale Free particulars (¢ opyrighted) Write W T. Greene, 806 Jenifer Building, Washing- ton, D. C TRADEMARKS $35; Design patents $35; Copyrights $5; Booklet Free; 20 years’ ex- perience Sanders, Registered Patent Attor- ney, 7 Rand MeNally Building, INVENTORS—Write for « Chicagc aes ir Guide Book, “‘How to Get Your Patent’ and Evidence of Invention Blank Send model or sketch of your invention for our prompt examination and instructions free. Ran lolph & Co., Dept 430, Washington, D. C PATENTS Booklet free Highest refer- ences results. Promptness assured Send model or drawing for preliminary ex- amination Watson KE Coleman Patent Lawyer, 644 G Street, Washington, D. C HERBERT JENNER, patent attorney and mechanical expert, 606 F Street, Washing- ton, D. C. I report if patent obtainable and exact cost Send for circular FOR INVENTORS PATENTS—“‘How to Obtain a Patent”’ is the name of a book which every inventor should have It will be sent free upon re- quest, and will tell you what you want to know about patents. It contains the whole story. It describes the different parts of the application and explains in simple lan- guage the prosecution before the Patent Offk e. It tells about joint applications, reissues, agreements, assignments, licenses. interfer. ences, infringements, process patents, design yatents, trade-marks, and prints and labels you are interested in patents either as an inventor, manufacturer or owner of a patent you will enjoy reading this book which was written by a lawyer who has had twenty- ve years’ experience in patent matters If you have an invention and will send us a sketch, model or photograph of it we will Promptly make a search of the Patent Office records and advise you whether or nc t. in our Opinion, your invention j patentable, our charge for this service being $5.00. We feel that our experience of twenty-five years has fitted us to render prompt and efficient service which will merit your confidence Write today Talbert & Talbert, 566 McGill Building, Washington, D. ¢ PATENTS If you have an invention which you wish to patent you can write fully and freely to Munn & Co., for advice in re- gard to the best way of obtaining protection "lease send sketches, or a model of your invention and a description of the device, explaining its operation All communica- tions are strictly confidential Our Hand- Book on Patents is sent free on request. This explains our methods terms, ete., in regard to Patents, Trade Marks, Foreign Patents, etc. ‘‘Scientitic American’’ contains Patent Office Notes, Decisions of interest to inventors and particulars of recently pat- ented inventions. Munn & Company, Solici- tors of Patents, 623 Woolworth suilding, New York; 524 Scientific American Bidg., Washington, D C.; 413 Tower sldg Chi- cago, Ill.; 366 Hobart Bldg 5 Market St.. San Francisco, Calif.: 22 Van Nuys Building. Los Angeles Calif PATENTS Procured: Trade Marks Regis- tered—A comprehensive experienced, prompt service for the protection and development of your ideas Preliminary advice gladly furnished without charge Booklet of infor- mation and form for disclo ing idea free on request Richard B. Owen 0 Owen Bldg., Washington, D. C or 41-R Park Row, New York DETAILED Mechanical Drawings from Your Sketches Ray Hanson, Thor, lowa PATENTS Time counts in applying for patents Don’t risk delay in protect- ing your ideas Send sketch or model for instructions or write for Free book, How to Obtain a Patent’ and Record of In- vention’’ form No charge for information on how to proceed Communications strict- careful O’Brien ly confidential service Prompt Clarence A efficient Registered Patent Attorney, 5892 Security Bank Build. ing (directly across street from Patent of- fice), Washington, D. ¢ See pages 154 and 155 LACEY'S Patent Sense. Valuable book free. See ad page 158 INVENTORS Write for our Guide Books and ‘‘Record of Invention Blank’’ be- fore disclosing inventions. Send model or sketch of your invention for our free in- spection and instructions Terms reason- able. See advertisement on Pages 156 and 157. Victor J. Evans & Co., 157 Ninth, Washington, D. ¢ i a ie | i A FORTUNE may be yours if your idea is commercially usable Find out before pay- ing fot patent I tell you how and help you make the sale Particulars free Write Ww. T Greene, 807-A Jenifer Bidg., Wash- ington, D. c. INVENTOR Stop turn your ideas into Their Development Purchase and Sale’ will show you from first idea to its success- ful exploitation Will save you hundreds of dollars wondering money how t Inventions wasted in wrong direction Rightly called Inventor’s Bible 230 pages. Limited upply $2.00 postpaid Refund any time if dissatistied Inventors Library Bureau, 117 West 2ist Street, New York IF you have a practical, useful invention to sell, write promptly American Pat- ents Corporation, Barrister Building, Wash- ington, D. € PATENTS wanted for manufacturing pur- poses Write, Ray Lee, Dowagiac Mich INVENTIONS | sold, leased and placed on royalty. Write for our Sales Plan Clar- ence J. Williams, Accredited Patent Engi- neer and Broker, 520 Pacific Building, San Francisco MECHANICAL drawing Difficult de- signs Your ideas developed safely Write Baskerville Engineers Co., Farley Bildg., Birmingham, Ala INVENTORS: Get your goods on the mar- ket Big opportunities Information free Service Bureau, 3703 North Whipple St., Chicago, Il MONROE MILLER Ouray Bidg.. Wash- ington, D. C. Patent Attorney; Mechanical Electrical Expert Before proceeding, read free Blue Book INVENTOR’S Universal Educator con- tains 900 mechanical movements; 40 per- petual patents motions. Tells how to obtain and sell Suggests new ideas Explains how to select your attorney and avoid patent sharks Special price (for a limited time) $1.00 postpaid Albert E. Dieterich, 621 Ouray Blidg., Washington, D. ¢ INVENTIONS Commercialized on Cash or Royalty Basis. Send us your ideas on any- thing built of wood, wood and glass, or all glass In business 20 years Complete facilities Send sketch or model Specialty Display Case Co., Dept. 11, Kendallville, Ind GET your own patents. Legal blanks, complete instructions $1. Cutting Sons, Campbell, Calif WE Develop your ideas into commercial shape for presentation to working models, t purchasers drawings, making experiments or ests., Courtesy, effic lency, secrecy and ample equipment; 30 years’ experience Ducorron- Rich Engineering Co., 504 Pacific Mutual sidg.. Los Angeles. Calif INVENTIONS Developed and Manufac- tured under royalty Unpatented ideas pro- tected in Company I SELL Charles A Rochester, N PATENTS Sold your name Willat 1121 Howard 8t., Patents Scott, 7 Production San Francisco. Established in 1900 3PM, Garson Avenue, or placed on Royalties both U and Canadian, Patented or Pending For immediate action, write Ar- thur S. Billings, Suite 401 Dekum Bldg., Portland. Oreg UNPATENTED Ideas Can Be Sold I tell you how and help you make the sale Free particulars (Copyrighted). Write W. T. Greene, 807 Jenifer Building, Washing- ton, D. C WILL interest ton dD. C finance patent (good invention) for F. A., % Patent News, Washing- GET Cash for your patent or iny ntion un- der our new plan. Write at once to In- ventors’ Syndicate, 61 Palladium Bidg., St. Louis, Mo ‘ RESPONSIBLE established electrical manufacturer will buy outright or manu- facture on royalty new inventions of house- hold utilities or appliances Details neces- sary L. J. Efferth, 6545 Carnegie Ave., Cleveland, Ohio HAVE You an Invention? If 80, write for our free book, ‘‘How to Get Your Patent,’’ tells our terms and methods Send model or sketch for our free examination and in- structions Randolph & Co., Dept. 144, Washington. D. ¢ PATENTS FOR SALE PATENT, Outright, front Ford hubs, emergency repair Erle Zook, Giendo, Wyo UNITED STATES Spring Carrier or design, easily ing qualities. E. E. Carrington for broken rear or device. Patent No. 1,521,504. Pillion for Cycles. ‘New manufactured, delightful rid- Sell outright or Royalty Napier, New Zealand FURNACE built and operated in Combi- nation with Fireplace. R Jensen, 404 West 60th Street, Seattle Wash, FOR Sale. All patent rights on wonder- ful new riding device, with large earning capacity Write W. H. Forsythe, 1205 West Mountain Avenue, Fort Collins, Colo, POPULAR MECHANICS ADVERTISING SECTION NOTICE, tric Cigar change tray space Patent manufacture Adams burlington, MR. INVENTOR invention for sale tral St., Bangor, Manufacturers— Improve Lighter, with emergen and clipper and adve No. 637,991 Inexpensj Outright or royalty I c If you have a | Write Hartley, Maine FOR Sale Patent, Im, roved Flour sjfin Outright or Royalty Basis Harr gawa, Tanana, Alaska GLOBE Valve, three Patents; a furnished upon request Sell outri, royalty George B McCracken, Willi Conn INVENTOR of improved Riding Which is easy t put on and take r same being buttoned up the front Will be wanted by everyone a big maker Alexander Teti, 129 Frank Torrington, Conn OUTRIGHT or Royalty patent 1,495,008 A device that hoots } clean John A. Feagin, 305 Sayre s Montgomery, A PATENT a Only practical Stop Dire Signal on l automobiles Sale or , Cox, 820 Cass St.. Chicago NEVER an opportunity like this I compels sacrifice « patent on sheet article 400 per cent better than arti same purpose that sells by million ally Merits fully proven Low price cash, terms on balance Illustrated scriptive booklet free. C. 7 Pelton, | lon, Ney PATENT Book Free Charles W. | Patent Attorney Lynn, .Mass PATENT 1,530,950 Pulley Clot! Cleaner which actually does the wh: for the busy housewife, removing d dirt from both stretches of the ling only one stretch is moved by hand k lent opportunity for enterprising wir cern to manufacture on royalty ba wire product without competition LN 148 Nelson Ave Jersey City, NJ FOR Sale—t S. and Canadian P Valuable Improvement ket—demand unlin ited Particulars. Address Pine St Martinez, Calif PATENTED pressed metal goods { cent stores manufactured on royalty K ard Co., Bangor, Penna PATENT 1,436,367 Baby Bar. Impossible to drop toy one Make offer Calif PATENT for Sale, newly for cigars and cigarettes essary. Outright or Good Samaritan H FOR Sale U. Pneumatic Tire shoe and inner of Pressed ©. Taylor, 15 on anything or Cash or R Chas. But High © on floor Mark Sullivan, s invente No cleaning Royalty H. Bart pital, Lebanon, P S. and Canada | Protector; Zoe be tube, in sections steel Puncture imy Cross St Newport, R OUTRIGHT, royalty or interest > article patented Will retail to milli Autoists and homes. H Hoy, si ‘alls, So. Dak ONLY automatic auto backing trailer Ss patent or take royalty Car backs a trailer automatically precedes in dir desired Hopkins & Wepplo, Fairfax. M FOR Sale or royalty Truck tire-re and replacing Machine Changes fri 10 in. tires Recently invented ! Pending M. Miller, Gainesville. } FOR Sale Patent No. 1,52] 124 \ washer. Sure Safe, Simple, Ss Needed in every home Mrs k Piasters Hyattville, Wyo UNITED STATES and Canada P for Sale Boltless Rail Joint Super anything invented For full parti write to William Depew Pequaming PATENT for Sale on greatly im stop and signal light for automobile I dicates direction of turn. et Exceed attractive and efficient Rings well t tract attention of pedestrians and autos Will sell for best offer. Wri particulars. Geo. W Michael, 29 Start Wilkes-Barre, Pa PATENT for Sale 5: household Patent Number 1 article Easy to mar ture. P. G. Baily, 5249 Oak View Eagle Rock City, Calif ae, LATEST Smokers’ Accessory—Com tion Pocket Ash Tray and Match Box ent Pending Dr. Osborn, Port Chester N. ¥ PATENTS For Sale To sell, | obtain patents, write Patent News-P, Wast ington, D. C MR MANUFACTURER, Layman or Side Dump Scraper Hoist, loads wag eran ons, does ditching. E. B. Hawkins, Apple gate, Oreg.

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eles worth-while patent, haven't whe you tell our two million ~ Most of them are spe ‘ 1 in patents and new invert RK. ¢ to tell you how other in- . sold their patents Geo Advertising, Chicago, Ill ager Classified ic Magazine AWING INSTRUMENTS AND DRAFT. NG SUPPLIES Automati Drawing Pen ted invention Trading Co., k City Write for sll Fifth Drawing nical Drawing imple enough for a boy igh for a trained echani et size illustrated ir Mechanic Press, Room anics Building, Chi LL tical RVEYING INSTRUMENTS and used survey- intry direct from guaranteed or money ler, 619 N. Broadway, St ck of new in the « faction )9ELS AND MODEL SUPPLIES Free book Record of informatior Communication — strictl r r pt careful € O'Brien, Registered Security tank } ge (di treet m Patent Office D. ¢ pages 154 and 155 rge for lildir fr See hinery re and experimental lies for | kinds P Tool Co 13 Lake Vie ings ‘ er l Inventions eveloped lone oS = we York iels, dies set Iring ery tools A Design ar Sadger Too Chicago, I St get lowest erimental work Spring St., New Y Manufacturing of new Machine ce Ill and General nufacturing Logan Chicag eam engine rts for sar r ble wiampe el Machine York City elmaker For working models M. 120 Liberty e working models for invent rimental work and carry ° Mi f brass gears and mode i ‘ r catalogue. The Pierce Ma Park. Ill lL, machinery, experimental fixtures, and dies for ail ipings C-P Tool Co ikers, 15313 Lake View Shop those i Send Street, New Y tere ‘ ents rk rs m- sup- del work, kinds ore. Place MANUFACTURING CRAFT Eventually petent Engineers, Designers Organization await ies, stampings, die rew-machine and wire pr Enameling Lurnishing Wrapping and Packing ns Large completely equipped guarantees prompt efficient is not the quality of raw mate- nor the precision in manufac- not just the service rendered that Metal-Craft the good reputation 7 all of these, as a constant ] Combination Estimates fernts hed Metal-Craft Manufac- pany, Box 259-W, Chicago dD To manufacture and sell on isis machines or tools with good sibilities American Broach & Ann Arbor, Mich Dies and Special drawing or sample our free catalogue of Pierce Model Works Metal- and duc As- to your It Stampings Mail us your c Send for n1le The lil POPULAR MECHANICS ADVERTISING IRON, Bra Alumin Casting Mod els, Patterns, Light Manufacturing Welch Brothers (« North Chicag Ill Our factory will make your models, manu- facture your articles as well as build your tools, dies and fixtures Standard Die & Specialty Co 1932 W. Austin Ave., Chi- cago, i WIRE goods made t rder. Cooley Mfg Co 530 Western Ave Chicago WANTED—Meritorious articles to manu- facture Dependable Mfg. Co., Streator. Ill PATTERNS, wood ar metal Models, tools and dies. Brass, bronze, aluminum and iron castings Screw machine work, produc- tion work of all kinds Write Modern Ma- chine & Pattern Co., Terre Haute, Ind FOR MECHANICS SHOP Notes—The standard handbook for hopmen of all kind 1 for amateurs Has been published yearly for 20 year 15 volumes still available "The mplete li brary of 15 volumes, $7.00 Odd volumes 50 nts eacl I ie now read Send N Money Sir write a postal sayir Send me the Sl Note Librar When the postman lelivers the hooks pay hi $7 plus the few cents postage lar Me inies Press Roon ROS r Me ini Building, Chicag Il! CARPENTER’S Handbook The new f Popular Mechani useful book t ateurs or professionals 66 id ' t ut methods of using w l ing ls Tells how to do the ar ty} if irpenter work needed ¢ Articles on veneering hingling, cabinet work ing routing drilling z *lathing, millir roofing ill the other phases of carpe No Money Simply write : ive in the 1 s and i u want the New Carpenter’s Han tbov ae When the post man hands yu the book, give him $1 and the few cents postage Popular Mechanics Press, 200 E. Ontario St Room 806, Chi- MACHINERY, TOOLS AND SUPPLIES SPE( IAL L Prices n a the Following Used Machinery 1 2-Jarecki Pipe Mac ine witt lie to ct l : 4 pipe threads WW tr dsor nes 1 6x10 ‘ r r Murrey Iron W ft ? i ond Auton t ndition | 2 h geared. No pou 1 18"x6 x6” Nati nditior 1 « holl uttir No pour t ( am Lathe (in fair ndition) Ser with full set of Gears, Comp T Back Gear Solid Spind 1 Willia ‘Whit e Cutting-off Machine (in good conditio Writ for full letails Saker lee M hir Compa Omaha, Nebr ATT H the Ideal Lawn Mower Grinder Guide to the nder Patented more cl r or filing set up r ower: cuts ir r the blade interested, send for p phiet with elf idressed stamped envelope M. P. Schmitt 1619 Sheridan Road. North Chicago, 1 AUTOMATIK Wrenc! Every mechanic ind motorist prospective buyer 100 protit Mechanical revelatior tpaid; Agencies per ‘6h Company, 145 Church St New York CONCRETE Building Block Machines and folds Catalogue free Concrete Machine Co 5 North Main St St Loui Mo x6’ LeBlond engine lathe, quick change 00 One 18”x8’ LeBlond engine lathe 5.00 One 24” Metal St aper $290.00, One No 60 Heald Cylinder gr $850.00 One No. 1% Cincinnati Milling machine $275.00 20” Drill Press $55 Terms to suit Complete line of machine ry and supplie Cincinnati Ma- chinery Supply ¢ 218 E. Pearl St., Cin- cinnati. Ohi ENGINES, MOTORS AND DYNAMOS STEAM Engines, one H. P. $18.00: %& $12.00 James Chambless, Bessemer Ala $75.00 WILL buy a brand new 4 Cyl. Mo tor that can be used for Farm Lighting Outfit, Stationary Engine Aut Trucks, Tractors, Motor Boats and for many other purposes Maximum speed 2.900 R. P. M Starter and Generator included Act now Fox Auto Parts Co., 57 East 26th St., Chi- cago MOTORS $2.98. Good, Practical, twen- tieth horsepower, 115 volt alternating-direct current Order Now Pay Postman Per Trading Company, Dept. M-6, 81 I é Racine, Wis SECTION 47 SPECIAL Low Prices on tl Following Used Machinery l 7 * Allis Chalmers Reliance Heavy duty Engine Serial No. 483 less Shaft bearing rank ar ind eccentri ntric strap 1 Split Fiyw "x10%"x bore * 8%” thick na 00 pounds; at ” pounds Boiler Pressure, 100 R. P. M ly ‘ fY, Engine i » indicated Horse Powe Engine is ir ood ndition Shaft 2 lia.) 115 H. P. Mietz & Weis Crude Oil Engine 1 25 H. P. Mietz & Weis Crude Oil Engine 1 40 H. P. Atlas Stea Et ine (Slide \V ' Le haft I r Write for ful letal Baker Ice Machine Co., Omaha, Nebr FINAL reducti M Generat 25-volt 1 wit! » hor ing phase ilternating tor, $52.50 With thre phase tor, $20.00 » bareals j tor enerators ‘ qhueer i Ele ri ( 6 W. Grand Ave Chicag 1! BATTERY chargir pay bi Profit pay for outfit i ter! Hobert Ohi GOVERNORS | control Auto Engines when used tationar engine Circu ir ( lee-Smith Governor Co Spring i N. Y¥ BENDING MACHINES feid Wrenchless Uni ast word in bending ta cold or hot t shape, including Lye Spring es t Pipe ¢ 1 1 i by r yet » Inexpe ive p need not be without r. Hossfeld Mf ( Minn ice vt t Fo wing Pipe Bending rt ine Bend e set of For letai taker I arpened tg x] as new erage cost 1 ro 1 nstructions $5.00 A. J. Colwell, Box 260, Norfolk Nebr BLACKSMITHS Liste Make more money doing hard jobs easy with Toys Mod Met is of Master Machine Blacks F rging and Solid Welding, Tool ind Tempering to a standard with colored tempering charts All for One Dollar §& ples Free M. Toy. Sidney, On! ELECTRICAL FOR Sa Battery char gar ur nd motor ne of Satisfaction uaranteed Sold t trial | i What |! trade in } nt Potential Wr Ira H >. or ELECTRICAL Kink The 214 in Everybod Handbook of t k ell how t 1 the variou t i at are mon in this day electr For rs or professiona Le wirl King electrica levices é r ighti transfor r ytors gene vit € inst itior testing repai batte manufacture ind repair and phone Send No Money Simply write FOR SALE—MISCELLANEOUS PURE Vermont Maple Syrup, Fre fr Mississquoi Valley fart in Northern Ver mnt Five and one-half pound ar $2.00 plus the Parcel Post Purit Guaranteed by State and National Laws It is without ny juestion the finest Flavored Syrup known Raymond \V Parker, Lowell, Ver- mont SWAP!—Buy Sel Anything \ where!!! What have you to er W Ortman C Post Office Box 67 Milwauk Wis BU Y—Exchange—s¢ Many f r reader have’ for ile r exchange the irticle you ar king for ind = lot f them are looking for the ery ite 1 want to turn i Get together Let ir two mill readers know your wishes ut ll help Ser yur ad toda Geo. Ff Laker Manager Classified Adver ising, P ir M Magazine, Chicago FOR Furniture Finisher We send vou i t t amp und = your rit K r ilways hot Price ¢ iP j Wr tod G. Johnson ‘ ( é Ss Waterbur Con

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POPULAR ENGINEERS and Firemen, Polished Br Torch, Leakproof, only $3.00, 5-year guar antes no money; send name livisior ! tion and number, get 10 day tria illus trated booklet Write, Jno. Unser, Carth- age ) ADDRESSOGRAPHS Letter Folders, Multigraph Envelope Sealer Duplicators,

less than half price. Guaranteed. Pruitt Cx 117 N. Market. Chicag SUPERIOR Rubber Weld The on rub ber weld on the market Sample can 8%« 0 stamp accepted Agents wanted R W. Smith Company, 1874 E. 20th St., Cleve- land. Oht FOR Sale Coin Operated Machines. Sarr Novelty Works. Shamokin. Pa WANTED—MISCELLANEOUS CASH sent i ediately for old gold, silver platinum, diamond genuine pe aris, watches gold crowr brid work old false teeth magneto point and other valuables Mer chandise returned if offer refused Busch Product Dept. 51, 2560 Eighth Ave New rk WANTED Gold platinu diamond jewelry, silver, unused postage umps, mer- eury false teeth, ete Anytl of value Highest prices Mail in returned immediately Ten-day return privilege Ohio Smelting Co 315 Hippodrome Bidg Cleveland, Ohio GOT something to swap? Write me, en- closing reply postage. Vitalis Malloy, Dept 27. Johnsonburg. Penna MAIL us your discarded Jewelry, Gold, Crowns and Bridges Watches Diamonds Silver, Platinum, and old False Teeth, Money promptly mailed. Goods fused. United States Smelting Works, (The Old Reliable). Dent. 71. Chicag: REAL ESTATE, FARM AND ORCHARD LANDS returned if offer re

POULTRY Farm on Bus Line 5 Acres Equipped. Only $900 Delightful location with good maple shaded -room house, 52 ft poultry house, garage; village conven- iences, markets at door: % acres for poultry and truck, woodlot fruit $900 include poultry flock and tools Details pg. 71 new big Catalog Free Strout Farm Agency, 255-P_ Fourth Ave New York City TO Rent—Furnished home, Otsego Lake; rate reasonable Grace A. Loudon, Coopers- town, N. ¥ ATTENTION Get acquainted.’’ Cash for your property Farm Hotel or retail store, no matter where located; confidential service Hayes Business Agency, Cincin- nati, Ohio 20 ACRES or more of our best land in Michigan; $20 per acre; 25¢ per acre down balance your own terms; 2-page book free Swigart Land Compan P1259 Ist National Sank Building, Chicage CITY or Farm Property Soild or Ex- changed c. Kral, 5255 Se. Wood St., Chi- cago $5.00 DOWN $2.00 monthly buys 2% acres No. Michigan Fruit or Poultry Farm, Camp Site or Summer Home $100.00 Surt Lake, Cheboygan Count Finest hunting, fishing, boating, swimming Good auto roads Get free booklet and map Oo Hermann, 140 So. Dearborn St Chicago, PECAN-ORANGE Groves “On the Guif”’ $10 monthly Guaranteed care n pro- duce $500.00 yearly Suburban "Oecbards, Dept. M, Biloxi, Mississippi $5.00 DOWN, $5.00 monthly; 10 acres un- improved poultry ruit, stock “ ew a3 $100; Ozarks Fishing hee ng apping Alvin Zimmermann, 1800 N Fifth, "Kar sas City, Kans SELL your property quickly for cash, no matter where located Don’t pay big cé mission Particulars free Real Estate Salesmen Co.. Desk B, Lincoln. Nebr DOGS AND PETS FOR Sale—Chinchilla Rabbits Send stamp for prices, literature Grove’s Blue Fox Ranch, Sault Ste. Marie, Mich POULTRY CHICKS 9c up 26 Breeds Circular James Wiltse, Rulo, Nebr FARMER'S Handbook—Filled with dis- coveries made by farmers who have found ways to save time and labor 270 pages containing 861 discoveries on all phases of farm work 683 illustrations Send No Money Wait till the postman delivers the book If you are more than delighted, pay him $1 plus a few cents postage Popular Mechanics Press, Room 806, Popular Me- chanics Building, Chicago, ll MECHANICS ADVERTISING SECTION

PERSONAL INTERNATIONAL Genealogist Estate Successions Heirs Families Absents earched anywhere low charges Rapid tem Write Central Postal Box, 293, Montreal, Canada Horoscope—Six pages, 2,500 consisting extensive four-page ope As ae An alysis and two- guide ving daily and monthly dvice > year Send 50c and birthdate Money ‘turned if dissatisfied Prof. Bolles, Box Cranford, N. J CHARACTER Readings Based on Your Signature 25c Silver. Box so. Hinsdale in a School run t Circular Free As yers 16 A. B. E. Mich. LEARN Bricklaying suilding Contr stows sociated Building Building, Grand FREE—Stop free information and permanently Tobacco League, vmple Hania. using tobacco. We will how to conquer habit Results guaranteed Box K, Omaha, Nebr TOBACCO Kills manly Vigor. Quit eas- ily Cigarettes, chewing, smoking, snuff conquered or no charge Small sum satisfactory. Stops craving; harmless. Full treatment on trial. Perkins Co., 34-A, Ha tings, Neb. TOBACCO or Snuff pay $1.00 if cured Superba Co., TP give easily Anti- cured or no sent on trial Md Habit Remedy Baltimore,

MISCELLANEOUS

TATTOORID,”’ nee lies, trial package 1 2 42nd St., Brooklyn, N I DO typewriting, 60c¢ per thousand words Forrest Robinson, P. O Sox No. 20 Powell, vi FOR Sale—165 gal. oil oak stain, highest grade, in 5 gal. cans—per can Packard three strand ignition cable 3c per ft Black shock absorber 5c per ft Shelby seamless steel tubing, size % to 1”, 10% per ft., 1” to 1%”, l5e per ft Sheet alu- minum 16 and 18 ga. 4’ x 12’, 28 Ib. per sheet @ Sic per Ib No. 8, 9, 10, 12 hard steel wire 30c per Ib. 1-16” soft brass wire 20¢ per Ib Welding rod 4%”, 3-16" %”, 1-16", 12¢ per Ib New 20x4 ball bearihg wire wheels, $2.50 ea. Surplus stock rivets, bolts, brass pipe unions and fit- tings Lincoln Standard Aircraft Corp., Lincoln, Nebr RADIO ¢ Kabinet, Dresser, Kabinet, AMATEI safe tattoo remover; _ Vestvold no &..

very $5.00 Kiddie ch; Smoking Cabinet patterns Sic ¢ Settee, 25¢ eact Kiddie 305 West rd St New York R Artists, make money by mail Plan complete 1.00; particulars free Smith’s Service, Wenatchee, Wash BILLI ARDS Build a table For write E Rose, Box 182, lowa INK-Powder. Make your own writing and save money; all colors, 25¢ a L. Sinkens, Box 300, Station A, Mass EASY parts Sprir abinet doll’s Desk details City, Ia ink package Soston, Money! tableware, Plater 288 Out—A New Boy 1309 Articles, 1320 Pictures Tells to make such things as Radio Receivers Airplanes, Pusheycle, Canoe Pontoons Rafts, Electromagnets, Wind Wagon > Boat, Catamaran, tion- Picture Sidewheel Motorboat, Motor-Driven Sleds, Camp Equipment, and hundreds of interesting devices Price $2 post Popular Mechanics Book Dept., 200 E St., Chicago Silvering Outfits; Marion, Auto- Free mirrors, Plans Ind Mechanic Book kle JUST Nc 4 how M Ontario LEGAL Times Advice This 50 Cents! Costs Elsewhere Reliable Several Confi-

dential, Disinterested Written Opinions by Thoroughly Experienced Lawyers One Hundred Words, 50 cts.; over two hundred $1.00 Satisfaction Guaranteed Write Now! Emmons and Emmons, Lawyers, Can- ton, Ohio. LOCKSMITHING, complete 500 tricks of the trade, new edition, many added fea- tures. $1.50; money back if dissatisfied. H Routson, 3406 Andover St., Oakiand, Calif DYKE’S Automobile Encyclopedia. 13th edition, new, greater than ever, entirely re- written and rearranged. Contains greatest array of automobile facts ever published in one volume. Separate books containing same information cost $21 Over 1200 pages and 4100 illus. Cloth $6. Flex. Amer. Morocco $7.50 postpaid Popular Mechanics Book Dept., 206 E, Ontario St., Chicago.

GI I— Gx T poste od prices pai flies insect See Sinclair tisement page 22 ARE You Old at Forty See tisement on page 149 of thi Electroc Thermal Company, 21 Steubenville, Ohio SIX-POWER

Mem x 4 I

yard Ins a tru Binoculars $5.2 memory for rent, $3.2 I ton serinud

AUTO Tourist’s Handbook—aA able help for those who wish t trip , how to prepare your long grind to avoid trouble, hx ind use camp equipment how the road and how to make ¢ ing quarters Will reduce your any dollars if yu t ented With this f Owner’s Handbook’’ filled with he for drivers Send no money P man $1 plus postage when he two book Popular Mechanics } 80 Popular Mechanics Buildi: oer LIFIED Photo - Engra and If-tone cuts Particulars 2 tor Fisher, Princeton, Ill ARTISTIC, National Anthe words, music bars, I S. colors gold star scrolled in gold with | 412x13) Price one lollar au Specialties 191 Bedfor< A ve B EXCHANGE a nev matic York 176 any ¢ advil is posta free 1 and say, Master 176 vy one at n Pe City PRAC f them e on Wri TICA A New how t« ral arce Se Practical Popular Mechanics jar Mechanics Bu ARTIFIC TAL E ver ¢ Iptic, 59 Barclay, CUTS anybody proce Stat np. tions world, Bros. Mil FORMS Mari Send Schie SE name appre Print KI ss, sent Mant Co., 111 Establi tc nes 10c¢ rcke ND and ciation ing Cor TES. for Rac ac $1 M. Day, L Subjects, study te your Sp your old Ingersoll cost ; & Co postal br Stay how givi subje name and a me “‘An } Subjects’’ ar Room 8 Chicag¢ Booklet Denver, booklet 176 nd Press, ilding fre yes can make, ecimens, Windfall, Sir parti Ind HOMEOPATHIC postpaid wal a hed » Cas Trappers Illus 4 72 lio jdress 100, npany, Eight N. Applause ( and Bioche to all part booklets fre« Wabash Ave 1855 nd t Lead § Soldier Animals trated Catal nd St., Brook ‘ard printed in . $1: 200, $ Sox 5, L kinds of kite described in Outdoor Sports the Y« Popu tions that are ¢ fest comb lar Mect are 80 any boy lescribed ned ined kit kite, lanics clea can make the simple instructions box bu e, eight- book T r and so we the kites The foll kite, boy kite tterfly kite, Cl pointed new Star other articles such as parachute dr This book contains on outdoor sports write Wher him Meche RO SWIMMING Popular Mechanics new "Round illuminating an devices. swimming, the tion for a fascir vices ball, sides not t write a postal, say ¥ postr plus chani Chica LA sonal maga of m me one Year ney year a posts 1 the $1 inies Ir Chicage and ny boy rating for football some n ess, 2 1! i or m gol ew ve familiar want han few ou nan the cs go, Ill TEST Advane zine agic with Press, “Ou is cent 200 and Best ement magic No strings il, if you postman plus the few ‘Devices sports if you you 200 ot No live Ir you the $8 postage ari S over Send hands

200 East Ont

are «ce book, Out The crystal-cle pictures ma} to make the There are boatiny ter f, and winter with whiet Send No Mone live in the | tdoor Sports.’ \ the book $ postage East Ont give Pot ario, R in Magic B Popular Mecha keeps you posted on the Helpful suggestions for performances to this offer your name and address to Popular M¢« Press, ing, Room Chicago, 807 hii. Popular Mechar

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POPULAR MECHANICS ADVERTISING SECTION WEVETIEW Read a This Big Offer Large photo shows our native Hawai- ian instructors, known as Clark’s Hawai- ians. Photo two is Messrs. Detborn and Howard, broadcasting from WEAF Radio Station, New York. Photo number three is Harry J. Clark, chief instructor. These professors welcome you as a stu- dent and offer you absolutely free a beautiful, full tone, genuine $18.00 Hawaiian Guitar when you enroll. Look into this offer and rush coupon to us for particulars. With our short cut method of instruction, you will quickly learn how to play Hawaiian Guitar which will bring you popularity and social suc- cess. You learn to play from notes. If you never had any musical training, you will quickly get on, R uSh because our nine experts have perfected a course of home instruction which is as simple as learning AB C’s. We don’t depend upon printed lessons only for your success, but QU pon we furnish photographs of our professors’ playing, diagrams, charts anc phonograph records. To prove this is as easy, we will send your first lesson FREE. Rush Coupon—Send No Money So positive are we that you will become one of our students, we will send free without obligation, our first lesson. Also receive our big book which gives particulars about our course.Write for ur free book and your free lesson today. HAWAIIAN STUDIO No. 526 ‘ of New York Academy of Music 100 FIFTH AVENUE, NEW YORK, N. Y. Please rush your book, ‘‘How to Learn Hawaiian Guitar” and my first free lesson. Also reserve a gift Hawaiian Guitar for me. This obligates me in no way whatever Name.... Hawaiian Studio of New York Academy of Music Studio 526-100 Fifth Ave. New York Cit

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50 POPULAR MECHANICS Hotel Positions Open: OTELS, restaurants, clubs. apartments, everywhere need trained men and women. Over 70,000 high-class positions paying up to $10,000 a year are open each year in the hotels o: the United States In 1924 the Hotel Business was America’s largest industry in new construction. Nearly a billion dollars worth of NEW HOTELS AND RESTAURANTS being built this year will need over 60,000 trained men and women. Hotels start you at salaries up to $3500 a year, with your livin: At any time you have your choice of over 1,000 hotel positions open You can have one of these higt.-class big-pay positions. with luxurious apartment and meals and fascinating work. No previous ex per.ence necessary. ‘1 he Lows ‘ guarantee to give you the valuable snowledge that it as taken some he most successful hotel men years to obtain—men who are now making $5,000 te $ 50.000 a ear. We train pore mail in your spare time at home with the Lewis Simplified tudy Plan and p y in touch with big « pertunl ~ Our students employed, our methods endor ~* by leading hotel men ever Send t oday for FREE BOOK, YOUR BIG OP 73 ORTU NITY," showin: how we can train you for one of these splendid positions in 20 weeks or at and explain- ing our Money-Back Guarantee, LEWIS HOTEL TRAINING SCHOOLS Cligord Lewis, Pres. Room S8-385 Washington, D. C. — —_ oo oe eee eee CU ie LEWIS HOTEL TRAINING SCHOOLS. Room §-385, Washington, D. C. | Send me without obligation the Free Book *““‘YOUR BIG OPPORTUNITY.’ ‘| Name rTTITiTiTirtr ADVERTISING SECTION Popular Mechanics New Handbooks If you could thumb through these new books, you would want them all. They are literally jar-med with practi-al ideas. Each one is written so clearly that a boy can understand the directions. Each is the experienc: of a practical man or woman. Most articles are ill trated with photographs or drawings. The practi nature of the subjects has made a wide sale for ther already although they have been, o> the market only a few weeks. Here are the tit!es of those now availal Popular Mechanics Popular Mechanics Lathe Handbook Any 2 for Boat Book No. 1 Automobi'e Own- Home Mechanics er’s Handbook Handbook No. 1 Auto Tourist's Handbook for Handbook Women Auto Repairman's Popular Mechanics Handbook No. ! Concrete Hand- Drilling andThread book No. 1 Cutting Order Several at One Time So low is the price that it is certainly wise to order as mar of these at one time as you can use. You may have any two for $1. These books make good presents. They a splendid for boys taking manual training cours« Free Magazine, Personal Advancement with each order POPULAR MECHANICS PRESS mesa Mechanics Bldg., Room 710, Chicago, a, LEARN CA RTOONING Successful cartoonists earn big salaries. Many of the most po day learned to draw in their spare time, at home, through the sooning and now earn $75 to $200 or more per week. The Landon Picture Chart Method of teachirg ¢ RIC *INAL drawing makes cartooning EDWINA— easy to learn. Hundreds of sketches like the abv ORIGINAL heads, figures, animals, etc. Send 6c in stamps today for sample Landon Picture Chart and wonderful course, also long list of successful Landon students ar possibilities for you. Please state your age The Landon School, 738 | National Building, cxplain pular cartoonists of to- Landon Course of Car- Former Students Who Are Now Successful Comic Strip Artists Are: BLOSSER— Creator of Freckles and His Friends. BYRNES— Creator of Reg’ lar Fellers. BRANNER— Creator of Winnie Winkle. LOCHER— Creator of Cicero Sapp. TAYLOR— Creator of Mom ’n Pop. every step in creating Creator of ‘‘Cap’”’ Stubbs. CRANE— full explanation of this Creator of Washington TubbsI/ ad information showing REDNER— Creator of ‘Toby & Tike.”’ Cleveland, Ohio GOV TJOBS OPEN INCOME TAX AUDITORS $1400 to $3300 a Year tone Vacations with Pay (All Postal Pay Just Ra'sed) . MEN—BOYS 18 OR OVER P Mail coupon immediately. Don't delay. , 4 Railway Postal Clerks, City Mail Carriers, Rural Carriers, o Franklin institute, Dept. D177, Rochest City Postal Clerks, Clerks at Washington, D. C. ’ Gentlemen: Kindly send me, at once, and entirely id Address NY. a without charge, list of U. 8. Government big paid positions o> obtainable. Advise me also regarding the salaries, hours ~ work, vacation and tell me how I can get one of these jobs A Send me also free sample coaching. NGMNG. oc ccccsSccsetecevecveversccerecocssecseecsecs

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you are mechan- — ly inclined, 4 y not do the work you like? Let me show you jobs, both in city and country. Jobs as me- chanics, chauffeurs, : drivers, tractor eers, garage men, re- pair men, battery and tire ions, paying $50a week p. No doubt about the fact | can, in a few short weeks yu to step into one of these good iobs. Over sixty thousand en whom I have trained, I esti- 20,C00 of whom are now g their own business. You need experience. I teach ith tools, not books. I make ed mechanics. Here is the PROVEN short cut to in- ependence and success. m1 are looking for work at $50 a week ip, if you would like to get into some- ng sure and solid that will give you success idependence, and can put in a few weeks this summer in TRAINING, write me today. ver FIFTEEN MILLION automobiles running, mand for mechanics, demonstrators, chauffeurs, lrivers, garage men, etc., is greater than ever before. esS Opportunities in cities and towns and even re- aces. Grab one of these good jobs now. own your own business anywhere, or travel where e, sure of good, interesting, high paid jobs. FRE CATALOG AND SPECIAL OFFER y big FREE 64-pagecatalog. It shows hundreds of actual raphs of men at work in my magnificent new school. Tells out wages, profits, opportunities in auto and tractor bus- Explains step by step how you learn. Interesting letters aduates telling how they made good. Shows how men om all over the world to this big school. Makes you oin the crowd. Tells verything you want to kr I willgladly send you e ’ beautifully illus- os ted. I'll tell you how toget hto business for yourself. No colored students accepted. =z E. J. SWEENEY, President LEARN A TRADE - , N.Y. ntirely sitions hours 3. WANTED; Make real % nOowsar POPULAR MECHANICS ADVERTISING SECTION 51 Earn *$§0 a weekandup ‘Auto and Electric BUSINESS i want to prove that you can do what thousands of men just in your position have done as a result of the SWEENEY SYSTEM OF PRACTICAL INSTRUCTION. There's only One Sweeney School— It’s at Kansas City, Mo. System of Practical Instruction is the ONLY way to learn if you want to save time and money and be properly trained. You get this at the famous trade school, the MILLION DOLLAR SWEENEY SCHOOL, and you get it nowhere else. I have helped 60,000 men to success. The way to learn is easy. You don’t need any ex- perience; age makes no difference. I teach with tools, not books. You learn by actuz ally doing the work. You should not delay. The first step is to send for my big Free Catalog. ; EMORY J. SWEENEY, President €31 Sweeney Building, Kansas City, Mo. Send me free, without any ao ation on my part, your 64- page catalog and Special Offer | NAME | GIVE AGE I po STATE

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52 POPULAR MECHANICS ADVERTISING SECTION YO Mechanical Engineering Learn at Home! MPLOYERS everywhere are looking for men with mechanical ability. Splendid sal- aries and rapid advancement are offered those with special training. There is an easy, delightful way in which you ean learn right at home in spare time. For 33 years the International Correspondence Schools have been giving men and women just the training they need for success in mechanical engineering and more than 300 other subjects. Hundreds of thousands have stepped into good positions through I. C. S. help, but never were opportunities so great as now. Let the I. C. S. help you. Choose the work you like best in the coupon below, then mark and mail it to-day. This doesn’t obligate you in the least and it will bring you in- formation that will start you on a successful career. This is your chance. Don’t let it slip by. The most important thing you have to do is to mark and mail this coupon now. i OT A OUT HER ee ee ee cee = INTERNATIONAL CORRESPONDENCE SCHOOLS BOX 5517-E SCRANTON, PA. Explain, without obligating me, how I can qualify for the position, the subject, before which I mark X. ELECTRICAL ENGINEER CHEMICAL ENGINEER Elect a Pharmacy Electric Wiring SALESMANSHIP Electric Lighting Show Card and Sign Painting — Car Running Ral m4 POSITIONS Heavy Electric Traction aaa. ATOR Electrical Draftsman SNE Electric Machine Designer. UEINESS MANAGEMENT a hb Expert Private Secretary Telephony Soctnes Correspondent MECHANICAL ENGINEER BOOK EPER Steno ee oe and Typist ae Cert. Public Accountant Machine Shop Practice Traffic Management Gas Engineer Commercial Law CIVIL ENGINEER GOOD ENGLISH Surveying and Mapping Seven Bhool Subjects Reading Architects’ Blue Prints ic METALLU URGY Railway Mail Clerk ARCHITECT a — ENGINEER Architectural Draftsman Overseer or Supt, PLUMBING AND HEATING konicULTURe Spanish Sheet Metal Worker Navigat Math’m't's C) Automobiles Poultry Raising RADIO Name — Present Business 3-6-34 Occupation___ —___—Addres — Street oné Ke. . — City— — State—— 4 ‘anadians may send this > to International Schools Canadian, Limited, Montreal, Canada Can Be a Dental Laboratory Expert Make $150 a Week BOTH MEN AND WOMEN IN DEMAND PERSONAL INSTRUCTION to Each Student In One Complete School for Me- j | chanical Dentists. Students taught on Patients’ work that is tually used. Only Modern Methods Taught. 50,000 Dentists need Lab. oratory Experts. Stivison Trained Graduates 3'."°::: Jobs Hunt You Every Dent does Laboratory Work that he wou giadiy bave done by an expert and pay big Prices. Real Dentist’s Tools are furnished and Instructions given by Real Dentists on work that Dentists need erriptive Literature Free. We pay cy n Fare to Kansas City d nasist y r your tutition Earn while you lear na LL on i) ’GET IN THE BIG PAY CLASS Write for Special Offer, Delay may cost you a good job and lots of money Stivison Dental Institute kang besust St FREE Training Book Shows y how to earn $150 to $600 a month in this immense field. Famou S & H shop-type training fits you quick at home for big jobs Exclusive system. Lack of experience or education no bar. Write S & H Engineering Co., 1422 W. Monroe St, Dept. F-1, Chicago, lil Mail postcard for amazing FREE book on electricity. yaay Ore AT 9. ded Jahent Pet ieeiccens publie ‘independent. a oppor- fore. 8 orton. men wi tra. . 000 to $1 Anaually | ang guide yen © by step, ‘ou _can train at o! w crelents o TS lew is ov oi al tr tara fer midenoe ‘books free p for them NO LaSail , Dept. 664-L_ Chicags The Wwe World's Carpese vet Susinese Vai Training institution Become An Officer —THE COAST GUARD Pay ranges $1,700 up to $7,500 yearly The U. 8S. Government pays $780 yearly to cadets at the U. 8S. Coast Guard Academy while training | become officers. This Institute prepares thoroughly to take the examination during rl spare time at home. Age limits are 18 to 24, Write for illustrated booklet to Dept. F-15. WASHINGTON PRFPARATORY SCHOOL, Pa. Ave. Station, Box 281. WASHINGTON, D.C. *TO GET DOLLARS OUT OF WATCHES WATCH-REPAIRING, ENGRAVING, JEWELRY REPAIRING. WRITE NOW, ENICAR TRADE e 530 W MONUMENT SQUARE, I Made *100,000 in less than five years as a REAL ESTATE SPECIALIST Started during my spare time, with no exper ence and less than $5 capital. If you want learn the secret of my success and follow my money mak method, send your name and address at once to Ameri Business Builders, Inc., Dept. A-446, 1133 Broadw New York. They send full information free, telling y how you can build up an independent, profitable bu ness of your own by using my amazingly succ essful syst« ecHroos RACINE. Wis JIN Wor Will

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e1 AIL... POPULAR MECHANICS ADVERTISING SECTION 53 Learn How to B2X JIMMY DEFOREST World’s Greatest Trainer will Teach You BY MAIL You Can Have STRENGTH k In 20 weeks I will teach you all there is to know it boxin y-—the very same things It jack Dempsey and a host of other ii) cha 3 and great contenders. TEX RICK D, greatest of all promoters will ent stage his new Madison Square Garden MI at > York, bouts for my champions ” which I select from my pupils every six months, and bring to my Long Branch, N. J., training camp at my - : own e for their final training. Send today for my big FR . 2 book e Golden Age of Boxing.” Enclose 10¢ to cover ¢ ay of - D Greatest book of its kind ever written. Profusely illustrated with photos of great fighters and fully describes my course and FREL OFFER. There’s a fame and fortune waiting lor you if you become a good boxer. Get my book and read all about it NOW , JIMMY DEFOREST, Box 616 342 Madison Ave., New York City 7 (™ Why Miss Half = = = =~} «= the Fun in Life? BE POPULAR—Learn to dance well! Arthur Murray, World’s greatest dancing teacher, has invented a remarkable new easy method which enables anyone to learn all the newest dances at home— in a few hours—at very little cost! No music or partner needed. Success posi- tively guaranteed! ‘300,000 learned dancing by mail.” FREE 5 DANCING LESSONS — To prove you can learn easily and quickly, Arthur Murray will send you Five FREE lessons, including Fox Trot, Gecret of Leading. and How to Gain Conf- Every man on the New York police force ence, oO pay cost o na . printing, . , ah etc., caches She. Ast WOW maa ben must be a model of HEALTH and good dancer soon STRENGTH. rthur Murra Arthur Murray, Studio 466 Set. Arthur W. Wallander, of the New York Police Training School, will tell you all the : : . secrets of health and muscle building, and of Practical Electrical Education sell-defenee that have made New Y« rk td Learn by the thorough approved scientific methods which our . ~ ws 7 7 , - , } twenty years of specializing enable us to give you, , men the finest in the world. Become a Certi ctrotechnician in one : rath . + year. oe pore ot ae ai —— In his new, comple te PHYSICAL TRAIN- ree to six months wer ve Ty : - ; and D.C. Armature Winding. Autometive ING MANUAL, Set. Wallander describes the Electricity, Radio included. Course unexcelled. police, arm, leg, abdominal and breathing ex- Illustrated catalog FREE. Besure tomention ageand education. ercises, and hundreds of other clever training stunts, SCHOOL OF ENGINEERING OF con WAKE all illustrated with action photos and COMPLETELY Deot. PM.-625, 415 Mershell $1, Wituestes, We. EXPLAINED SO YOU CAN DO THEM without further instruction. ] Make Furnitu ti Learn Tricks of Self-Defense j iil e re a ome He teaches the new AMERICAN ART OF SELF- i —either for your own pleasure or to DEFENSE as practiced by patrolmen and detectives yearly J \ sell. It i is easy when you have the in- _ yA ey a a hold or head ams how to — adet 2 li linP k Mech — the tables on a man w 10 attacks you with a swing of his ining structions suppHed in Fopular Alec anics fist, a knifeoragun. All you need is to know the tricks, es you Home Furniture M: iking Library. This and you can have the biggest bully at your mercy and ot ated library consists of the following astonish your friends with feats of dexterity. c ‘loth-bound. illustrated books: A complete course in all branches of physical training, ON. D.C including instructions in boxing, care of the feet, swim ——— 1. Wood Working for Amateur Craftsmen | ming, physical and personal appearance, carrying an “HES. y —— a mam we unconscious person, etc., all explained with wonderful . ssion Furni — Part clearness. 4. Mission Furniture — Part 3 "OU YOU want to feel the thrill of health in a perfectly 5. Arts-Crafts Lamps ‘ c developed body. HOO These books contain full directions For $1.97 you can buy a course that cost the world’s INE. Wid and drawings for the making of all greatest city millions to develop. Clip and mail the sorts of furniture, including table and walllamps | | coupon now. O for electric lights. One purchaser writes that he Siebel Pub. Corp., Dent. P. M.1 has made over $1,000 worth of furniture for 34 W. 20th St.. New York. Te ° , Se >the P SICAL’ ! - sale from these books. You can do the same. ING MANUAL. When it comes I SEND NO MONEY — Simply will pay the postman $1.97 plus ST nie a postal asking that Popu- — peri- r Mechanics Home Furniture Name . Making Library be sent you C.O.D. it to When the postman delivers the addres aking books, simply hand him $2.50 plus — wical the few cents postage. City.. i. POPULAR MECHANICS PRESS g you Popniar Mechanies Building State........ bu Room 711, Chicago, Hl. ste ——

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54 POFULAR MECHANICS ADVERTISING SECTION Professional Coaching for Saxophone Players! Any ‘dub’ Saxophone Player can quickly jump into the big- money agg > ssional class with Cragun's sensational new home- training. Adopted by 500 Sax Artists, endorsed by Tom Brown, Arthur Davis, Ed. Barroll and other world-famous Saxophonists, teaches you the “tricks of the trade,”’ makes you a professional Artist! CRAGUN’S ‘‘The Business Saxophonist? Trains you how to LAUGH on the Sax—how to “Slap-tongue,"’ double- tongue, triple-tongue. Teaches you transposition, rhythm, improvising, breaks, vibrato, “talking.” You can- not earn BIG MONEY with your Saxophone until you have mastered these 20 lessons. Even Saxophone geniuses say CRAGUN’S newest, greatest work has helped them. Sent on approval Money back if not wanted after 10 days trial. Finder & Urbanek | : Make Cham Write me what sport in- World’s Largest Saxophone Publishers | i Pe terests you. I will tell 1322 Congress St. give individua you how I can pep Dept. 501-A Chicago, I11. coaching by mail Baseball you up and turn you in your favorite Tennis into a champ, as I aport.. Twenty- did with Tim Jor- eight champs to my com. Harry Bab- credit. Let me make Boxing cock, and many you one. My system others. Write today never fails. Golf for my book FREE SEIXAS ATHLETIC SYSTEMS, Dept. 6114, 1920 B’ way, N.Y. Great New Invention At Home in your spare time. Be an expert Airplane Engineer. Earn $3,500 to $10,000 a Year Practical course — takes only a few months. Write for special offer on free airplane parts and free catalog. WESTERN AIRPLANE CORPORATION Dept. M6 Monadnock Block CHICAGO FINDER & URBANEK, Dept. 501-A, 1322 Congress St., Chicago, tt. Please send SAXOPHONE home-study courses marked. bY subject to Money Back Guarantee: E BUSINESS SAX A~C* “epee $1 now, mite $9.00 D. (Total $10.00 CRA a; - & CONSERV ATORY METHOD begi $1 now, balance $1.50 and post- ome oo CO. Dd. ; For Seekers _ Health—Power—Beauty Learn at home with | Generate High ait jency Violet Ray, Moghentos Cragun’s fa = ous Vibration, Medion! aoeee rieity and Ozone—the CONSERVATORY eatest curative Combined or separate Fhey operate on By ae light in your home or on their own motive power at less than 50 cents per year . WRITE - Ask Rd Bg on these ri tie ,een prepared sent to — rt cost. Re-vitalize your Brine back energy. Be wholly alive. WRITE TODAY Lindstrom & Co., 30 W. Lake St., Dept. A-135, Chicago Make Money Drawing Cartoons It’s Easy To Learn When Shown In The Right Way Some of cleverest cartoonists and comic artists in America today learned to draw during their spar time by following CARTOONIST LVANS’ SIMPLE AND EASY METHOD. This school is recom mended by foremost cartoonists because they know the students are handled right. If you like to draw, send a sample of your work, either an original or a copy, and we will send you a portfolio of cartoons and full details. The course is NOT EXPENSIVE. The W. L. Evans School of Cartooning 222.2% T E LEGRAPHY (ELIMINATE POISONS! Decayed wastes are deadly to life forces. Eliminate them with Vit (Morse and Wireless) and RAILWAY ACCOUNTING taught thoroughly. Big O-Net Magnetic Blanket—the greatest discovery of recent years salaries; great opportunities. Oldest, largest — Endorsed by Telegraph, Used by hundreds of hospitals and doctors. Relieves pain. Write Railway, Radio, and Government officials enses low—opportunities to earn today for free health document. Representatives want large portion. Catalog free. DODGE'S ws rirUTe. Jones St., Valparaiso, ind. | VIT-O-NET MFG. CO., Dept. 565, 4105 Ravenswood Ave., Chicago, Mi. METHOD. Lilustra- tions show how to finger every note correctly. C ragun makes the Sax easy 2 to learn. 2 volumes, : hundreds of exercises, 118 duets and trios. $2.50 and few cents postage 3~be it the pronunciation of Fascista, the spelling of a puzzling word, the location of Esthonia the meaning of soviet, realtor, vitamin,etc., this Supreme Authority- WEBSTER’S NEW INTERNATIONAL DICTIONARY contains an accurate, final answer. 407,000 Words 2700 Pages 6000 Illustrations. Regular and India-Paper Editions G.& C.MERRIAM CO., Sprinafield. Mass. Write for specimen pages, prices, ete., and FREE Pocket Maps, per Popular Mechanics. ___.___ _“ THERE'S MONEY INIT” bts === LEARN TELEGRAPH Y= i6n-—— ~__—___ _-_ MORSE AND WIRELESS—-——-_—-—= = ‘TE EA A Cc H YOU U R SE E & FF 0 hairusual time, at trifting cost, with the he wonderful Automatic Trans- mitter, THE OMNIGRAPH. Sends unlimited Morse or Continental messages, it any speed, just a8 an expert operator would. Adopted by U. S. Government, and leading Universities. Colleges and TelegraPh OMNIGRAPH MFG. CO., 13-19 Hudson St., NEW YORK if you own a Radio Phone Set—and don’t know the code—you are missing most of the fun.

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POPULAR MECHANICS ADVERTISING SECTION 55 10U io) OS ame CANT STUMP SN 4 Hepes Car Owner! Mechanic! Garage Owner! You need the new American Auto Cyclopedia! With these 4 books you can lick anyAuto problem with one hand! To prove it, we will send them to you to use as your own for 10 days without cost or obligation. Use them for reference. Use them for home-study. Look up any snag you encounter, on any make or model auto, truck, tractor, bus, taxi or aeroplane, from the first “one lungers” down to 1925 straight eights. SPECIAL SALE? 1. Specifications, a separate sheet for each car, e = showing parts and sizes, ignition timing, firing order, generator output. Worth $5 to any car as owner or garageman. SAVE 40% To introduce the new 1925 = edition, price cut 40% for A=7) 2. Wiring Diagrams. Separate sheets for every make and a limited time. Easy model of auto. With these diagrams you can make good on terms, only $2 every electrical job that comes along. Also worth $5, but free down, only $2 _ 1.3 | KS this offer remains open. @ month until 3. “ Trouble Shooter.” Quick, practical ways $12.80 has been paid. Mailcouvson for to find 58 different kinds of trouble and 334 standar d meth xis tocure them. A third $5 value free with the American Auto Cyclopedia. re ») draw, lio of building , Ono iS! vith Vit cago, Mi. Send no Money ist books”’ but com- 1e-training in every f auto work by 16 ed authorities. 2400 diagrams, illustrations so you can understand the ficult subjects. 19th edition, re- 1925 Adopted as text-books by muy leading colleges and vocational schools 10 Days’ FREE Trial! n't send a penny—just mail coupon. Put these 4 elpers’’ to work. If you are a mechanic, this great Auto brary will make you an Auto Expert. If you are a car ner, useit tosave repair expense. If you are a garage-owner, ed this Cyclopedia—turns losses and leaks into PROFITS. ] i brings all 4 big volumes for 10 days’ FREE TRIAL. Mailit today! IMERICAN TECHNICAL SOCIETY, Dept. AA-19, CHICAGO, ILL. NS American Technical Society sept. AA-18, Ch cago, lil. pans me § e, 4 big . P AMERICAN AUTO cYt PE ‘ whic ” DAYS FREE TR ither re em t r if ild le =—_ fs N 8 cus Buc ng & O terenc Dassen

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56 POPULAR MECHANICS ADVERTISING SECTION Tobacco Is tobacco is not hurting you. ing tobacco, is a slow working poison. Tobacco is lowering your efficiency. It slows amandown. Makes it harder for you to concentrate your mind on your work. You haven’t near the amount of ‘‘pep’’ and energy you would have if you stopped using it. There’s many @ man twice as old as you in years who's twice as young in energy, simply because he lets tobacco alone. Some day you will realize to what an alarming extent tobacco has undermined your system. Let Us Help You a very few days. long waiting for results. Tobacco Redeemer contains no habit-forming drugs of marvelously quick, scientific and thoroughly reliable. It is in no sense a substitute for tobacco. or to continue the use of the remedy. nerves and make you feel better im every way. Results Guarantee goes with each full treatment. you. should fail to banish the tobacco habit completely. home treatment. send on reguest. Just mail the coupon—or a postal will do. NEWELL PHARMACAL CO. Dept. 300 Look at the facts square in the face, Mr. Tobacco User. 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- Slow, yes—but sure. Tobacco Habit Banished It doesn’t make a particle of difference whether you’ve been a user of tobacco for a single month or 50 years, or how much you use, or in what form you use it— whether you smoke cigars, cigarettes, pipe, chew plug or fine cut or use snuff— Tob Red r will positively remove all craving for tobacco in any formin Not the slightest shock to the nervous system. Your tobacco craving will usually begin to decrease after the very first dose—there’s no After finishing the treatment you have absolutely no desire to use tobacco again It helps to quiet the Asingle trial will convince Our legal-binding, money-back guarantee t We will refund every cent you pay for the treatment if after taking it according to the easy-to-follow directions, it gether with testimonial letters from Free Proof men allover the country telling how they have been absolutely freed from the tobacco habit by this simple You could not ask for stronger proof that Tobacco Redéemer will free you from the habit than the evidence we will gladly | Let us send you our free booklet on your free booklet revarding the tobacco habit and SEND Coupon for the deadly effects of tobacco, to- -] proof that Tobacco Redeemer will positively free me St. Louis, Mo. 4 —-} urting You You may think 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 TOBACCO is getting the upper hand. Any well-informed doctor will tell you that these are only a few of many symptoms of tobacco poisoning. And YOU know that the use of tobacco in any forn is an expensive, utterly useless habit. You know yo ought to quit. any kind and is NEWELL PHARMACAL CO. Dept. 300 St. Louis, Me. Please send, without obligating me in any way from the tobacco habitor my money will be refunded ND iacneccnctinienitnaiimeit ae are eke : SIE TI anttnninenrtannesnenpacunen bites hens

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FF Se

POPULAR MECHANICS ADVERTISING SECTION 57 Let Me Make a Man of You| you dragging yourself about

from day to day always ailing and complaining— ways tired and despondent—suffering from Backache, Indigestion, Constipation, Nervousness, Vital Depletion, etc., etc., your Biliousness showing in your your lack of energy in your eyes? Have you and your family given up hope that , will ever be a real man again, achieve success and amount to anything in the world? Have you lost ambition and allowed your youthful ideals to slip down into the bog of al defects and unfitness? Then, you are the man I want to help Pull Yourself Together Brace up—you can come back—there is a way out \ an regain your vigor and vitality, your health eaknesses that are undermining your body ) psia, you can be a real man again and strength—you can conquer and brain—you can root out the results Bad Habits and neglect and fill your life with the success and joy of abundant health it is Not Too Late. There is hope for you. It doesn’t matter what brought you to your present physical condition—it doesn't matter hew many methods you have tried in vain—or how often you have been disappointed. You can be saved from the heap of worn-out humanity and be rebuilded into a red-blooded specimen of vital, netic Manhood I Can Re-create You There isn’t the least doubt about it. I know that my scientific methods will make

you a 100% man. _ I have helped and am helping thousands of men and women, boys and girls, many of whom had given up all hope of relief. I can do the same for you I have no pills or powders, dope or drugs to offer you—no foolish fads or fancies—no ition diets or tedious expensive routines. My methods are safe, sensible and tific and are based on the immutable laws of Nature. These are the principles I applied to my own body and won the World’s Award as the Finest Specimen of and Health Attainment. Look at my picture and note the evidences of rugged , Strength, vigor and endurance. You can be as I, if you will, thru the application e same wonderfully effective principles that — me successful. I want to help I can rebuild, rehabilitate and restore you with THE NEW SCIENCE OF HEALTH PROMOTION Strongfortism will go directly to the root'of your trouble and remove the eause, Strongfortism will purify and enrich your blood, revitalize your nerves, strengthen r Heart, Lungs, Stomach, Liver, Kidneys, Bowels and other vital organs. Strong- fortism will send the rich, red blood to every corner of your being, bringing the nutri- t and vital force necessary to restore the half-dead cell life and build up muscle | bone. Strongfortism will drive out the poisonous waste matter that has been are umulating for years in your body and brain and make you clean, wholesome and mal, externally and internally. rir o e Come to Me in Full Faith < as You Would to a Brother Open up the secret chambers of your heart and tell me all of your troubles without ervation. You can confide in me with full faith—I will never betray you. Come to with your problems as you would to your father, mother, brother or closest friend | let me show you the way out of your difficulties with Strongfortism—The Beacon rht of Health, Happiness and Success. Once you accept Strongfortism you enter a v life. The results are immediate and positively thrilling. You feel the rich red d pulsating thru your body—you acquire poise, confidence, and a magnetic person- ality. You feel new power developing in every organ and function. I personally irantee your success, irrespective of your sex, age, occupatior surround Send for My New Free Book “Do It With Muscle”’ is the ructive book you can ever read It will tell you in understandable,

LIONEL STRONGFORT DP ““RGENT - “'orverd, deciared that

most interesting :

non-technical

ist how you can nesses and make ignetic, robust banish your ailments conquer y« yourself over into a splendid spe: 100% Manhood with pep and pov

absolutely free. Just mark the subjects on the fi iltation coupon on which you want special confi information and send to me with a 10c piece (one d p pay postage, packing, etc. It’s a man-builder ss maker and life-saver. Send for my new fr Right Now—TODAY Lionel Strongft Physical and Health Specialist Over 25 Years Dept. 1796, Newark, N. J., U.S.

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58

Men Needed in Electricity O PROFESSION offers greater opportunity to-day than Electricity. Salaries of $12 to $30 a day are not uncommon and the opportunity for advancement is unlimited. As Forrest Crissey said recently in The Satur- day Evening Post—The demand for electrical work is increasing immensely and electrical con- tractors assert that the supply of electrical workers cannot overtake the demand for several years.” Now is the time to prepare for a good position in this profitable, interesting profession. You can study right at home in spare time through the International Correspondenc many other men have done. The I. C. S. Elec- trical Courses have been endorsed by Thomas A. Edison and Charles P. Steinmetz—the date elec- trical wizard of the General Electric Co. Just mark and mail the coupon printed below and full information about Electrical Engineering, Electric Lighting, Electric Wiring, Electric Rail- ways, Radio or any other work of your choice will come to you by return mail. Mail the Coupon To-day — ee TE INTERNATIONAL CORRESPONDENCE SCHOOLS “ BOX 5514-E SCRANTON, PA, Explain, without obligating me, how I can qualify for the position, or in the subject, before which I mark X. [ ) ELECTRICAL ENGINEER ) GREISCAL ENGINEER . Electrician |) Electric Wiring Electric Lighting \_J Electric Car Running |) Heavy Electric Traction Ls E lectrical

Show Oard and Sign Painting |] RAILROAD POSITIONS _JILLUSTRATOR oo '

POPULAR MECHANICS ADVERTISING SECTION

AGENTS $s Some Seller Looks Like $5.00 Worth Gives You $1.10 Profit! *? You should see our Nifty Nine Package Representatives introduce our products first sale of beautiful combination sety Tollet Articles, Soaps, etc., at half prices. No fancy talk—they sell on Make twenty to thirty sales a day, $1.10 profit on each. Easy to Average $100.00 a I will show you the biggest opportunities. No experi

Tite te The quality holds y: = > A a comers, thus you build ) ns manent, sound business. hd the Coin will keep you financially dependent. Also & winning plan, a Premium to =< sale Write today for trated circulars explaining our unique plans. Aet ‘ E. M. DAVIS CO. Dept. 5620 CHIC

DOWN "A Sireews ELECTRICAL en pee Se oe of oldest, best Easy, Practical, Thorough.” Brings eat courses: FREE 5 Days T money. For ity, or need men. Send for FREE C BURGESS ELECTRICAL. SCHOOL, 521-127 WN. Dearborn St., CHI EXPE Home Trai

Cz LEAR 4 MMMPUCPLII, Oy, . I Teach Penmanship by Mail Small Cost, Spare Time, Easy Lessons Writ2 for my book “HOW TO BECOME AN EXPERT PENMAN" FREEI It contains specimens and tells how others became expert writers by the Tevis Method. Your name will be T.™. “TEVIS written ona card if you enclose stamp Wteetades Box 25K, Chillicothe, MANAGEMENT ee U Lae *

_

STATEMENT OF THE OWNERSHIP r REQU IRED BY THE ACT OF CONGRESS OF AUG UsT Me pchanic s Magazine published monthly at Chieago, Ill, for Apel ny "192 if State of Illinois ty o a. I Be sone me, a notary pet in and for the state and county aforesaid, pers peared H. H. Windsor, Jr., whe says that he is the editor and t that the following is, to the b ownership, management, et« above caption, re quired by the Act Lawe and Reculations, printed names and addres ases © are Publisher ' H. H. Windsor Jr 30 having been duly sworn ac siness manager < seat of ans OS She afore ording to aw depose uf f the Popular Mechanics Mag his knowledge and euler a true stateme said publication for the date show { August 24, 1912, embodied in section 44 his form, to wit iret tor, and businese mang

00 East Ontaric : Ontario St.. Ch a by «a livid q name and addr orporation the nam holders owning T cer be «i ; Winds r, 200 East Ontario St.. ¢ aco, I 200 East Ontario St., ¢ Te , Ill.; First rust and Savings Windsor ti na B. Windsor and Henry y of th Estate of He nry H w ndaor, deceased ange I . bondholders, mortgagees, and other security holde ownir more of total ar nt of bonds, mortcaces, or other ‘ so stat ne ourt That the two paragrar of the owners, stock! s, and security holders ers and ee

olders as they appear holder or se ty k

ciary relation

ng. is give e full kn stockholders and se«

any other persor associatior or corp said stock, bonds, or oth Jr., Editor and Business Manager. Sworn t of March, 1925. J.G RAHAM Notary P 9°

er © stated by him H © and subscribed before me th iblic My commission expires BECOME A ILWAY POSTAL

CLERK

py recently raised from $1850 to $2600 a ye Steady job. Pleasant work. Common educati aaama Sufficient. No“pu

Re on Civil Service School ROCHESTER, WN. Y. necessary. M coupon for FRE! Catalog.

Civil Ns ‘tend me without charge your * Patterson \ i - © Service Schoo log, describing this and other lt e Fovernment positions s Dept. 36 + @ Rochester ° ee PY

15

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biggest No experi olds your, ou build 4 | business ti financially te today for Herbert Di ' Warrenton CHic -XPE bme Tra Days T FREE c 1 makes $7,500 « year this great offer, the greatest ry of home study schools,

POPULAR MECHANICS ADVERTISING SECTION 59

emotive Electricity pays W. E. Pence, Autereean. Ores over $9,000 a year tos r: Columbus, Otic, makes $30 Soe day in business for himsett y Are in Big Demand I Will Train You at Home To Fill a Big Pay Jcb , = It’s a shame for you to earn $15 or $20 or $30 a week, when in the same six days as an Electrical Expert you can make $70 to $200 — and do it easier — not work half so hard. Why then remain in the small-pay game, in a line of work that offers no chance, no big promotion, no bigincome? Fit yourself for a real job in the big electrical industry. Be an Electrical Expert Earn $3,500 to $10,000 a Year Today even the ordinary electrician —the ing money—big money. But it’s the trained man—the “ picked out to ‘‘boss’’ the ordinary Electricians—to boss the pay $3,500 to $10,000 a Year. Get in line for one of thes “screw driver’ kind—is mak- Electrical Expert ’— who ts Big Jobs—the jobs that ‘Big Jobs” by enrolling ion is ow big FREE book. now for my easily learned, quickly grasped, right up-to-the-minute, Spare-Time Home een, the ae Study Course—now. Trustee tr i Age or Lack of Experience Your Satisfaction Guaranteed pet tke Ce No Drawback So sure am I that you can learn Electricity—so sure am tpg, .p°. mg ou don't have to be a College Man; youdon’t — | that after studying with me, you, too can get into the giving t q ve to bea High School Graduate. “As Chief “big money”’ class in electrical work, that I will guarantee under regular way. For ~_ “Cooke 1 tools, and I give the a ti you a complete outfit, one that would cost Get Started Now — Mail Coupon bond to return every single penny paid to me in tuition, if when you have finished my Course, you are not satisfied it was the best investment you ever made. Guarantee Backed by a Million Dollar Institution k of me in my guarantee, stands the Chicago Engi- I know educa- able to make Bac neering Works, Inc., a on dollar institution, thus ng toevery student enrolled, only a wonderful training in Electricity, but an unsurpassed Stude nt Service as well. It’s this home. Service that makes “ Cooke trnising (iberent sem Say other train- Service plus oke Training, that makes the ’ Trained Man the Big. ‘Pa y Man,” everywhere. Be a ‘‘ Cooke’’ Trained Man and earn $12 to $30 a day —$70 to $200 a week — $3,500 to $10,000 a year. Use This “FREE OUTFIT” Coupon L. L. COOKE, Dept. 51-A The Man Who Makes 2150 Lawrence Ave., Chicago “Big-Pay’’ Men Dear Sir: Send at_ once, Sample Lessons, your Big Book, and full Re articulars of your Free Outfit and Home Study Course, also the Free ad.o Course—alli fully prepaid without obligation on my part.

ibsolutely fre

EE I | SND ccmvinsneiven i I Chicago, i111. Occupation The Cooke Trained Man is the “Big Pay Man

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60 POPULAR MECHANICS ADVERTISING SECTION / WILL MAKE You NO. EXPERIENCE EARN °2,000 TO ‘10,000 A YEAR Gc Why take small pay from uncertain jobs? Why be knocked in around from this to that, and not know whether you are going t th have a job tomorrow or not? You can change all that. Trained Auto Men m Are Wanted. Learn how to repair autos right. Make big money as a skilled ng man. Pave the way for a business of vour own—a business that can make you State” independent for life. You can do it with a few weeks’ training at my Schoo 2 biggest the Michigan State Automobile School—the great auto-trade school in tly ng heart of the auto industry. Write me today about your- self and your plans and what you have been doing. I’ ll show you how to get out of the rut and win success! Be a Trained Man—Successful! Fellows just like you step out and make great successes Trained men ar wanted all the time—everywhere! More than 17,000,000 autos need servic th fou and repairing. Millions of tires and batteries to be kept in commission. Mor a men needed for good jobs. More garages—more electric service stations more tire-repair shops—welding shops—battery stations needed. ‘1 means amazing opportunities for the men who start now. Fit yourself to \ a good job, or to start a business of your own. Very small capital needed. You are right at the door of big money if you decide now to mak this your business. LEARN AUTOS, TRUCKS AND TRACTORS IN THE HEART OF THE INDUSTRY Without any previous experience— Read What Factories Say: just a liking for mechanics you can learn the auto business from A to Z in a few weeks here in Detroit—the heart of the industry. Then step out, equipped with knowledge and train- ing, to a future of certain, big money making. You have big advantages, learning the business here. It’s the fountain head of the auto business. You are taught under factory endorsed methets You learn both theory and practice on latest equipment. Go through the great Ford plants Visit the other auto factories—learn their methods first hand. The Michigan State Automobile School, in Detroit, the auto center, is the logical place to learn the auto business. LEARN IN A FEW WEEKS—START NOW A thorough training in Detroit, at the “ Michigan State,” fattens your pay envelope if you are working for others, or puts more profit in business for yourself. Service Man; ; a Repair Man; a Welder; a Machinist; or Tractor Specialist Free Course in Garage Management, Business Methods and Selling included. Classes are always open. Jump on the train for Detroit and get started now. PACKARD MOTOR CAR Co., DETROIT “I do not believe you would ms ake any mistak: in attending this school if you wish to become thor oughly experienced in the automobile businesm’*” A “We believe the MICHIGAN STATE AUT‘ SCHOOL, Detroit, would best meet your requir« ments, as its course in technical wars is most thorough and complete in every detai THE STUDEBAKER CORPORATION OF AMERICA Buick Motor COMPANY “We do not know of a better automobile schoo! than the MICHIGAN 8T Anca Lena ing the M.S. A.8.” MIGHIGAN STATE 306 Auto Building Detroit, Michigan DETROIT You can take a full Automotive HUDSON MOTOR CAI CAR COMPANY Yo Course in 12 weeks, or my big for D eee Seuss” te ese Ce “This school ae cae 2 hiy of by tl h . . s sche oug z : specialize in any one of its money- automobile men of Detroit and is considered or fu making branc hes; you can be an Auto of the best equipped and most efficient schools | Electrician; a Tire Expert; a Battery the country. You will make no mistake in attend et

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POPULAR MECHANICS ADVERTISING SECTION 61 Good Positions Open /,, . lhe demand for trained men is greater than the supply. Look cked to any garage—everybody is busy as bees, have more work 170 rose ig ti than they can do. Men working overtime, all at extra pay. ’ 00 ited Men means big money for repairmen and boss. These money- 7000 cilled ng opportunities can be yours, too, with “ Michigan S A ; > Vou State” training. The years ahead are predicted to be the YSto lon; S, 0] biggest years of the industry. That means certain money- Ms 8 'Tiop n th ing advantages to men who start in the business now. 5 Md ony Le PRACTICE ON FINE FREE arg 4 NEW CARS Ses, I is the new Oakland Six with four-wheel brakes, Course in Garage Manage- f the many fine cars that are here for you to . . ! ‘ice om. Here you learn on up-to-date, new Ment, Business and Salesmanship sent - types of — engines, axles, ipuonanie Our fine Business Course, taught by Packard ser- electrical systems ther new cars and engines ectiie oie, ws Aa Py ‘ : . cata : n ar + equipment are the new Packard Straight Eight Vice Manager, FREE to all students who enroll this rviee th four-wheel brakes, Packard Twin Six, new Buick month. Learn how to locate and lay out a garage about Mot four-wheel brakes, Cadillac Eight, Hupmobile, equipment, management, banking, selling, advertising. This ‘ Reo, Oldsmobile, course alone is worth $100. But it’s free if yougetin now. Write ns G. M. C. truck at once for application blank to reserve your place in the School 1] | Hudson, Over- a iind,and §©6§Spend Your Summer at Detroit man y - al prin “The Summer Resort” City ma Where business is good. Where weather is always fine Detroit's location in center of the Great Lakes gives it ideal climate, not too cold in winter, not too hot in summer. Get away from the burning sun into the cool breezes of Michigan RS After school hours, enjoy boat trips, swimming, fishing, sail- ing, canoeing on the lakes and river. See Major League base- ball games—see Ty Cobb, Babe Ruth, Eddie Collins, Tris Spe aker, Ws alter Johnson, George Sisler—all the stars Spend a pleasant summer and improve yourself at the same time. a } We work hard up here but we believe in some good ~, times, too. ry: _ EARN WHILE YOU LEARN take We help you get part time work to help pay -hor- expenses while in School. Or work days and take a our evening course; many do this. It starts them to success. Ask for details, and explain your ¥ circumstances fully. We are here to help you succeed. oT MAIL THE COUPON TODAY Fi a Get all the interesting facts. Send for informa- tion, illustrated with photos of school equipment, and letters from graduates. It tells you how you x can get a good paying job—how you can go into - business for yourself with little capital. Mail th shoo! HOME STUDY COURSE FREE coupon or send us a postcard today. Write now ¥ You can start your course here any day. Jump on the train ed ee ae Be a0) for Detroit now. If you can’t come at once you can begin to learn - home by my new Home Study Method. Then come here later to / Ci 7c th finish. No extra charge for the Home Study Training. Write me al oupon or rfullinformation. Or use the coupon. This is your opportunity he i 518 } wild tt. to get ahead. Act now A. G. Zeuver, President Michigan State Automobile School 3?¢ pernorr, MICH Send me FREE and without obligation complete infor- Ve do not enroll colored students, except for our Home Study Course) mation about Detroit-training to make the most money. AUTOMOBILE SCHOOL! = 3729 Woodward Avenue, Detroit, Michigan City ; State 12 Weeks’ Auto Course am interested in 30 Weeks’ Master Course. Home Study Course

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62 LL of the Chemistry, Pharmacy and other books listed below were written and prepared by well-known authorities in this field and are used by leading colleges and technical schools through- out the country. They contain much material that is not available in any other form — anywhere. They are complete, authoritative, profusely illus- trated, yet surprisingly low in price. Studied faithfully, there is no doubt that they will help you to gain a°greater mastery of your work and secure a better position and a larger salary. SEND NO MONEY Just check the names of the books you want on the coupon below and we will send them to you on approval by return mail. FREE EXAMINATION COUPON INTERNATIONAL CORRESPONDENCE SCHOOLS Box 5512-E, Scranton, Penna. Please send me the books I have checked below. I shall either return them in five days or send you the money. [] Pharmacy and Materia Medica, 326 pages - $ (] Qualitative and Quantitative Analysis, 472 pages [] Organic Chemistry, 387 pages - - - ] Inorganic Chemistry, 605 pages - - | Chemist’s Handbook, 348 pages- - - = coMmoo: oooo°o°o Chemistry of Iron and Steel, 347 pages - - Chemistry of the Packing House Industries, 313 pages - - [] Industrial Chemis try — M: anufacture and Sugar, 375 pages - [] Chemistry of the Manufacture of oooo0o w& ~ wn of Paper Cc ottonseed Ww w& t st ro) Oil, Petroleum, etc., 415 pages - - 50 C) Good English for Everyone, 442 pages - = 3.00 Seven good books only $1 each (] Pharmacist’s Handbook, 324 pages - =- = , [] Machine Shop Handbook, 335 pages - = = 1.00 f Mechanic’s Handbook, 330 pages - - - = 1.00 [] Electricity Handbook, 414 pages - - = = 1.00 [] Building Trades Handbook, 409 pages- - - 1.00 {) Advertising Handbook, 445 pages - - - - 1.00 [CJ Radio Handbook, 514 pages - - - - - = 1.00 Name Address.. 7 = ro} : So AB cnn A DB: oR POPULAR MECHANICS ADVERTISING SECTION fe & Bargains in a TE LEGRAPHY' at home in8Months By DUNLOP SYSTEM on Ptonograph Records! § guarantee to make you an expert teleerapber right } your own home in spare time, er § will retund your money! Famous Dunlop System, quickest way Morse or International Code now on phonograph Learn easily by methods adopted by U.S. Army and N Railroad, Brokers’, Commercial Tel graphy and U. S. License Radio Complete training includes receiving and sending at «;. of 30 to 40 words a minute; and all other duties pay jobs. R.R. course includes train operatior signal, etc. Radio course prepares for land or sea o; position. Telegraphy the stepping stone to boss-; EARN $175 TO S4SOCO A MONTH = crormous salaries a> ees JOBS FOR MY GRADUATES Free employment service finds positions when yx ph a rite immediately for my special offers, free bx brokers,banksandtele- ©**Y terms. Dept. 601, Bethe: radivootrator D. J. K. DUNLOP, Chief Dispatcher Chicago Tel. institute, 1338S. Michigan Ave. CHICAGO $3,000 to $5,000 a Year If you want to make at least $3000 a year, send for our 1 big catalogue FREE. Qualify for a big pay job in the mobile business after only 10 weeks’ training in New Previous experience not necessary. You learn by doing : work on passenger cars, truck and tractors. Thousar successful graduates. FREE BOOK—Write today for large, illustrated catalog u STEWART AUTOMOBILE SCHOOL 225 West 57th Street | Dept.Al75 NEW YORK CIT) $3,000 to $10,000 a year. Howto! repair, install, sell radios now, quickly lear: Simple, easy home-study plan, 1000-mii free with course. Low cost, easy terms. now for free big book on radio opportun'! RADIO ASSOCIATION OF AMERICA 4513 Ravenswood Ave., Dept. A-6, Chicago, tii. Learn RADIO At Home-By Mail ALL METAL ADJUSTABLE | PANTOGRAPH Indispensable Wherever aGreughti: g board is used. c enlarges or reduces. Sent oat on receipt of..... ~ ree escccece $3 -00 Money refunded tf not satisfactory. DRAWING AIDE CO. 206 Caxton Bidg., Cleveland, Ohio [EARN WAT CHMARKING 40 ENGRAVING BY OUR PROFIT-SHARING PLAN OUR GRADUATES SUCCEED One of our Iowa students started in a very small way-—now ing over $30,000 a year Another in Wisconsin, over $10,000 first year. Day or night classes. Call or write for FREE Bb‘ CHICAGO SCHOOL OF WATCHMAKING Dept. 501 4844 Lincoln Avenue, CHICAG! FREE TRIAL for-Me n and Women Try Violet Rays for your ailment. It is the latest achievement in the field of medi- cine for HEALTH, BEAUTY and VITALITY. ‘© improve scalp Violet Rave ger work 4 ee ve doctor b 4 ailments success Tally 1a .. wih Violet Rays and satisfied users and get tails of our VI-REX COMPANY, 223,22" Peariz Sueet

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0 the | BOOK CHICAGO POPULAR MECHANICS ADVERTISING SECTION in the saw you buy HERE must be no question about the steel in the hand saw you buy;there need be none. The different good qualities of several steels must combine in Disston Steel to make it: Stronger than the steel beams which support great buildings; And tough as the armor-plate that protects a battleship. It must sharpen to a razor-keen edge; Be hard, like a bank vault’s door; Be springy as the main spring of the finest watch; And polish like a precious metal. Henry Disston made the first crucible saw-steel to be melted in America. It made better saws than had ever been known. Today it requires 3600 work- men and 68 factory buildings to supply the world’s demand for saws of Disston Steel. For Disston Steel, in “The Saw Most Carpenters Use” — Gives you a saw so tough and keen that its teeth stay sharp and it cuts with ease— A saw whose strength means clean, straight sawing for years— A shining blade that runs smoothly, easily, speedily, no mat- ter how deep the cut. The nearest hardware store has your Disston Hand Saw waiting for you. You will do better work than ever before, when you have made it yours! HENRY DISSTON & SONS, INC. Philadelphia, U. S. A. Hardware dealers the world around sell Disston Saws, Tools, and Files |\DISSTON

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114 POPULAR MECHANICS ADVERTISING SECTION F a ' | Le x ‘ Y —a intr 4, Ar i \ , re wee vihape yt > = 7 | The Bell Telepnone Laboratory in 1884. From an old wood engraving published in the “Scientific American” Winning nature’s secrets Every day that passes records some new advance in the telephone art. Con- stant experiment and observation are winning new secrets of chemistry, of electricity and magnetism, and of mat- ter. Nature’s unseen quarry is yield- ing to the researches of the laboratory _ that exact scientific knowledge which is among the telephone engineer’s most priceless resources. The workshop of the telephone engineer is a scientific laboratory. Here he studies and ex- periments with principles and laws of our physical environment and sets them to aid us in our daily lives. Forty-nine years ago the telephone was born in a scientific laboratory—a very small laboratory, to be sure, as it numbered in its personnel none but Bell and his assistant. As the Bell System has grown that laboratory has grown, and as the laboratory has grown the telephone has grown in efficiency, in distance covered, in numbers, in per- fection. Countless are the milestones marking progress in the telephone art that have come from the laboratory. Today the laboratory numbers among its personnel 3000 employees, more than half of whom are skilled scientists and engineers. Headed by a vice-president of the American Tele- phone and Telegraph Company, it is known as the Bell Telephone Labora- tories, Inc., and forms an indispensable department of the Bell System. ace LON AMERICAN TELEPHONE AND TELEGRAPH COMPANY AND ASSOCIATED COMPANIES BELL SYSTEM One Policy, One System, Universal Service

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POPULAR MECHANICS ADVERTISING SECTION 1] See demonstra- \ tion at hard- ware de alers’. Try the “YANKEE” Ratchet. A “Yankee” Brace —everyway worthy to take its place with the famous “Yankee” T ools. Made for the man who values his time and labor, wants accuracy and efficiency, and sees the economy of paying a little more for the finest tool of its kind. With it you can hold any shape bit without loosening in work. Yet chuck releases bit at a turn of the wrist. A finger-touch gives a smooth, silent, pow- erful ratchet that works without calling for a hand to hold chuck from turning back. No. 2100 Hard Rubber Handles. Unbreakable. Do not warp, shrink, crack or bind. Top handle steel-clad, ball bearing. Sweep 2 RRP EI ee = a Famous “Yankee” Ratchet.— Smooth as stem- wind of a watch, yet unbreakable. Dust-proof. Moisture-proof. Quick, positive ratchet shifter. “ s handle caps held by New ‘Y ankee”’ Chuc k.—Ball be aring, ; Quick - yatented “Yankee” centering and accurate. Won't loosen in work os il i pre nn with any bit; round, square taper, 1% in. e method, prevent- aililies ‘ “y, ” ° ° s 74) “sb > > 2 Og een enanesive hendile Dealer everywhere sell ‘Yankee Tools play Write us for “Yankee” Tool Book “y Deep Nortu Bros. Mrc.Co., Philadelphia, U.S.A. DANY Yankee Finish. Nickeled and fin- ished in keeping with the perfection of its construction. § YANKEE’ TOOLS Make BetlOv Mechanica’

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116 POPULAR MECHANICS ADVERTISING SECTION In an isolated region, almost inacces- sible in winter, this automatic hydro- electric plant of the New England Power Company on the Deerfield River starts, protects and stops itself. - These power plants almost think Each Saturday afternoon, thedemand for electric current diminishes. Imme- diately this plant, at the head of the Whether electric power is Stream, shuts down, and a storage generated from water, coal reservoir begins to fill with water. or oil, there is automatic i t that will d i et ee ae & On Monday morning, the plant starts ne ee Compeny ine itself and sends water down to all this equipment and the the others. : experience of its engineers is at the service of everybody No human touch. Just G-E auto- who wants to develop elec- tric power. matic control. GENERAL ELECTRIC

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HC 2 Wtake Stuley Vilechanmcay POPULAR MECHANICS ADVERTISING SECTION 117 Hew to the line with the Plumb Hatchet ITH the Plumb Hatchet, you cut where you meant to cut. Balance and hang and power are in it —in the red handle, in the black head. Plumb makes this balanced tool to cut fast as well as true. The blade is tapered just right for easy, clean cutting. The head is forged of steel that Plumb armor-plate methods toughen and temper for years of use. And to keep this head tight, for safety ana service — the Take-Up Wedge (ex- clusively Plumb). A turn of the wedge tightens the handle, preserves the bal- ance, makes the Plumb Hatchet always safe to swing. FAYETTE R. PLUMB, Inc., Philadelphia, U.S. A. Instantly, with a turn of the wrist, you retighten the head of any Plumb tool. V-shape of wedge expands wood of handle against all sides of eye, Bi all the way in . = | a, PLUMB. ———— —__—- Hammers Hatchets Files Sledges Axes Look for the Red Handle WITH THE Black Head (Color Combina- tion Registered as Trade Mark, U.S. Pat. Off.) EXCLUSIVELY PLUMB

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118 POPULAR MECHANICS ADVERTISING SECTION Why Do Mechanics Call Starrett Tools Their Best Friends Black Enameled Frame Micrometer A justly popular number from the Starrett Line of over 2200 Fine Precision Tools. This Micrometer has the Black Enameled Frame, Decimal Equivalents plainly marked on the thimble and is furnished with or without Ratchet Stop. See pages 142-181 in the Starrett Catalog No. You can buy this Starrett **Mike”’ from any good hard- ware store at avery attrac- tive price. It is accurate, well made and will give you years of reliable service. Your choice of 1, 2, 3, 4, 5 and 6-inch sizes, singly or in sets. 23 “AP” for description of the very complete line of Outside and Inside Micrometers made by The L. S. Starrett Co. If dealer cannot supply you, write us and we will send you a copy at our expense. THE L. S. STARRETT CO. World's Greatest Toolmakers Manufacturers of Hacksaws Unexcelled Steel Tapes—Standard for Accuracy ATHOL, MASS. No.

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POPULAR MECHANICS ADVERTISING SECTION 119 You can still make “money talk.” Turn a dollar into a Topkis Union Suit at your dealer’s. You’ll say any dollar that buys such underwear value is a loud speaker. Here’s fabric otherwise found in only high-price makes. Here’s com- fort-fit that comes from liberal cut. Here’s careful tailoring. In every detail there’s workmanship far be- yond the commonplace! You'll marvel that such under- wear can be yours for a dollar. Look Men'sUnion Suits.$1.005 . ih nc awers, c for the Topkis label. each; Boys’ Union, 75c3 Girls’ Bloomer Union, 75c; Children’s Waist Union Suits, 75c. Men’s Suits, $1.50 in Canada. Write for free illustrated booklet Topxis BROTHERSCOMPANY, Wilmington, Del. General Sales Offices: 95 Worth St., at Broadway, New York It pays to buy Topkis by the box. Six union suits for $6. The more suits in service, the better each one wears. Athletic Underwear

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120 POPULAR MECHANICS ADVERTISING SECTION = “Get a BROWN & SHARPE —we'll be sure it’s right then!” T’S a byword with every machinist, «Get a Brown & Sharpe for sure ac- curacy.’ Whenever disputes arise over the measurement of a piece of work, Brown & Sharpe Tools surely and accurately de- termine that measurement. They are the | final judgment in accuracy. When they | say a job is right, it /s right. | Brown & Sharpe Tools are the biggest help a mechanic's skill can have. You'll see the complete line of “tools that help mechanics” in the Brown & Sharpe Small Tool Catalog No. 29. Send for your copy today. BROWN & SHARPE MFG. CO. | Providence, R. L, U.S.A. | BROWN €? GHARPE TOOLS “Standard of the Mechanical World”’

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POPULAR MECHANICS ADVERTISING SECTION Keep radio tubes like NEW! JEFFERSON TUBE REJUVENATOR doubles and trebles tube life wners of radio sets long have hoped for such a device as this—a “tube rejuvenator” for home use to keep radio tubes at full efficiency and greatly increase their length of life. Weak tubes mar radio reception just as much as weak batteries. Keep your radio tubes like new with the Jefferson Tube Rejuvenator! Get from your radio the one thing you paid for—satisfactory reception at all times. All radio tubes deteriorate with use; the Jefferson Tube Rejuvenator “brings them back” in 10 minutes! Attach it to a convenient electric light socket. Used once a month, it adds months, even years, to the life of every tube. Improves Summer Reception You cannot expect satisfactory warm- weather reception with “run-down” tubes. During spring and summer you will appre- ciate the Jefferson Tube Rejuvenator most of all. Get yours now. At its small cost of $7.50 the Jefferson Tube Rejuvenator soon pays for itself many times over in its savi tubes and bat- teries. It’s wasteful to be without one; it’s economy to own one. Sold by leading dealers in radio supplies, and fully guaran- teed. See it today. If your dealer can’t supply you, send $7.50 to JEFFERSON ELECTRIC MBG. Co. 501 South Green Street, Chicago, IIL Makers of Jefferson Radio, Bell Ringing and Toy Transformers; Jefferson Spark Coils for Automo- bile, Stationary and Marine Engines; Jefferson Oil Burner Ignition Coils and Transformers. $10 in Canada Takes Large or Small Tubes—201-A, 301-A, UV-199, C-299

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122 POPULAR MECHANICS ADVERTISING SECTION Victors in Olympic Soccer and ‘Jennis Championships wear Keds / es Every four years the Olympic 4 ‘ Games draw from all corners of ; A Keds orford the globe the greatest athletes in é ’ model — designed every line of sport * ; i a for general wear ne as well as jor — ‘ e sports NE of the big surprises at the last . Olympic Games was the Soccer ber-soled shoes! Springy rubber-soles Championship—hotly contested and and cool canvas uppers make Keds finally won by the team from little light and comfortable. Yet Keds are so Uruguay. strongly constructed, so tough and . In their gruelling daily work through- durable, that they anh set record selv out the series—every member of this after record for long wear! | fb : ' ~~ * »>member—every real Keds shoe always ae champion team wore Keds! But remember—every real y a _— a : has the name Keds on it. They come in all the a Os In addition, all of the Olympic Ten- popular styles—and at prices from $1.25 to $4.50. Vi nis Championships were won on these Avoid substitutes—insist on Keds! bh > , . . . pe famous shoes. _ Our Keds Hand-book of Sport gives interesting the P s information on games, sports, camping, vacation wa Another tribute to Keds! Another suggestions and dozens of other subjects. Sent free na ie ’ 7 : rt @ v« ? om Bowie ' proof that there’s a real Vetta. Dept. 370, 1790 Broadway, Neu nae difference between Keds st terfe and other canvas rub- United States Rubber Company St For A sturdy athletic-trim stati Keds model in the popu- leng lar lace-to-toe style— And built for the hardest no £ sports and Stati vacation wear Trademark Reg. U.S. Pat. Off, ay ' CG) They are nor Keds unLEss the NAME Keds is on the shoe

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s oxford le signed ul wear as for i we POPULAR MECHANICS ADVERTISING SECTION 123 oil is Revolutionizing Radio Set Building \ ODERN electrical science A has discovered a new principle in radio frequency amplification—a new improved transformer that gives the most amazing results. It is known as the Erla Cir- cloid. Simply clip the coupon below—and let us send you the complete technical story. 4 vital improvements The story of Circloid advan- tages is a fascinating study— even for those who are not interested in the technical side of radio. As practically everybody knows, in the ordinary radio set, not only the antenna but the radio frequency coils them- selves act as pick-up devices of broadcasting signal. This is one of the chief causes of what most radio fans call “broad tuning.” With Erla Circloids, inde- pendent pick-up of signals by the coils is completely done away with. Selectivity of the receiver is always at maxi- mum. Sharp tuning and less in- terference are the direct result. Static disturbance has been reduced to the very minimum. For everybody knows that static has no particular wave length. It invades them all. And because the Circloids have no pick-up qualities, only such static as happens to be present on the exact wave length to which the receiver is tuned can ERLA CIRCLOID ‘Radio Frequency ‘attain __*Trade mark Registered ae Circloid Radio Advantages 1. The absence of an exter- nal field eliminates the effect of the coil nearby coils or wiring circuits. 2. The Circloid has no pick- up quality andisrendered | immune from outside | electrical influence. | upon adjacent Three Great | | 8. Its efficiency is higher than any other type of coil and losses are unbe- lievably low. The New Erla Balloon Frequency Transformer and Coupler Patent $4.00 Each come through. Thus here at last is a radio set that offers new delights in summer-time radio. No other receiver can provide such perfect freedom from annoying interference. Another Circloid improve- ment is greater stability — smoothness of operation and ease of control. The tendency of conventional receivers to squeal and howl Pending uncontrollably is due to exces- sive feed back between coils and wiring circuits. With Circloids feed back of energy is eliminated between coils and confined solely to the wiring circuits where it is sub- ject to complete control. Thus perfect stability is obtained. Oscillation that is sudden and violent in the average receiver, making it necéssary to start tuning all over again, is now controllable. Just the slight turn of one control and it is completely controlled. But the most important of all Circloid improvements is its effect upon tone quality. Any radio engineer will tell you that excessive “feed back” is the greatest cause of distortion or blurring. And Circloids, be- cause they have no ex- ternal field, eliminate stray feed back effects and do away completely with this principal source of tonal dis- tortion, Only with the Circloid principle can supreme musical clarity and fidelity of reproduction be obtained. No other radio set can offer you these exclusive advantages. No other set can offer these supreme achievements. 4 ways to buy the Circloid Erla Circloid Transformers are offered for sale, $4.00 Each—in kits of three, $12.00—in kits of three with Erla Con- densers, $21.50—and in Facto-y-Bilt Kits, $49.50. They may be obtained direct from your nearest dealer. Or write direct for detailed information. Electrical Research Laboratories, 2507 Cottage Grove Ave., Chicago, Ill. Gentlemen: information about the new loon Circloid Transformer. | Address —— — "I ll Inc. I Please send me deta''ed Erla Bual- EE a ee

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124 POPULAR MECHANICS ADVERTISING SECTION Vi Every All-American transformer has stamped upon it a serial number which identifies the rec- ord of its individual test at the factory. The man- ufacturer stands behindit absolutely provided this serial number is not ef- faced. Look for the number, and for the famous red guarantee tag with the inspector’s punch marks. Of what importance is it to youas a user of radio transformers, to know that any users. The average purchaser of a trans- former chooses, above all, an instrument particular brand, such as Att-AmerIcAN, which has been recommended to him by a Ne has held continuously for a number of person whose judgment he respects. e 1¢: he positic ,; , ; thie years the arary of proven leadership in Only by the most thorough accuracy and oe quantity of sales! care in manufacturing, and unusualcare in “a . . ‘ . ° . . . qt —_ Simply this: that such an achievement is testing, is it possible for Att- AMERICAN \S the best possible proof of continued satis- to maintain this position. Let it be your X faction given to other Att-American protection! A new edition of the Radio Key Book, just off the press, illustrates an eight-tube |= set which is the sensation of the year. Send 10 cents for it now, coin or stamps. — ford | ALL-AMERICAN RADIO CORPORATION, 2656 Coyne St., Chicago ten E. N. Rauland, President ads a ~ Largest Selling Transformers in the World

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tw ~~ VY oe ed Motoriatal You can’t POPULAR MECHANICS ADVERTISING SECTION _ The New yPDQ Wrench with the MAGIC GRIP” That moves stubborn nuts, bolts and pipes with lightning speed. Plier Ease and Pipe Wrench Grip. No adjustments to make or springs to get out of order—simply hook this wonderful tool on the object you wish to turn and apply pressure on one handle only—the patented P.D.Q. principle does the rest. The Harder You Pull the it Grips. The patented hook and pull teeth give a sure positive grip that defies resistance —and the harder you pull the tighter they grip. You Need This Handy Tool. The P.D.Q. wrench is the handiest tool for the tool kit, home or work bench. It has a thousand and one uses that will many times repay its cost. tools are already in use—due to their many advantages and our liberal money back guarantee. The P. D. Q. Is Built to Last. The P.D.Q. wrench is made of car- bonized drop forgings, with patented rivet that prevents binding or side slipping and is guaranteed to give — satisfaction or your money back. Act Now. Use Our Money Back Guarantee. Avail yourself of this wonderful offer. Send $1.00 direct to the factory. If for any reason you are not satisfied return the wrench and your money will be cheerfully refunded. Save. Save middleman's profits and salesmen’s ex- Thousands Are Already in Use. Although on the market only a short time, thousands of these wonder ACT NOW | ; * ford > i Sat Dy me ght COUPON wT The P. D. Q. Wrench Co., Three Rivers, Michigan. Please send me the P.D.Q. wrench with the understand- ing that if it is not satisfactory iF my money will be returned. penses and receive this handy wrench at far below its value. motor car owner. > & Your Money lam enclosing $1.00. Back If Not iain /hose lawn mower nuts Send Id : Re kOe TA Satisfied 7... Bs aad References: Any Bank at Three Rivers, Michigan ,1

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126 POPULAR MECHANICS ADVERTISING SECTION SARGENT PLANES Sargent Steel Block Plane No. 5206 Sargent Auto-Set Bench Plane No. 714 Planes that suit the carpenter are the ones for you to use You are eager to get the profes- sional touch into your work. To do this it is necessary first of all to use good tools and particularly good planes. The two Sargent Planes illustrated here should be on every home and school work-bench. First, because they have proved their ability in the hands of exacting carpenters in shops and out on building jobs the country over. Secondly, because they are most moderate in cost and are built to withstand the wear and tear of hard usage. SARGENT & COMPANY, Mfrs. The Sargent Auto-Set Bench Plane has a feature that saves much delay. The chromium stecl cutter may be removed for whetting and replaced without changing original adjustment. Yet, in place, the cutter is as rigid as can be. For end work and the smaller jobs, you can’t beat the Sargent Steel Block Plane. These two planes fill practically every need you may have for a finishing tool. They will help you get professional- looking results. At hardware stores. Write us for booklet. 49 Water St., New Haven, Conn, 4 a

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POPULAR MECHANICS ADVERTISING SECTION 127

or Ir. ail/ Sade ~ pega ES » HERE is eager power to outspeed and outclimb we ee >> anything else on wheels—ready to take you fay WF yw through side roads and bypaths right to your sets, A or to your favorite streams and hunting grounds. New 1925 “Stream-Line” Harley-Davidson has 27 improvements—lower, easier riding position, Alemite lubrication, husky truss-loop frame— pt me plus — ey go ba guy i maaan | lie economy (ride fifty miles for a dollar—gas, oil, ps Baa are tires ond )—but the price is reduced. for particulars. Go to your Harley-Davidson dealer. Have him give ! * AZ you a free Demonstration Ride—without obliga- < 47 : 2 & tion. Learn about his Pay-as-You-Ride Plan. Send the coupon below, today, for interesting booklet. HARLEY-DAVIDSON MOTOR COMPANY DEPARTMENT P MILWAUKEE, WIS. | Harley-Davidson i The Motorcycle HARLEY-DAVIDSON M@TOR COMPANY, Department P, Milwaukee, Wisconsin Send me your new 1925 cataleg showing the “Stream-Line”’ Harley-Davidsons in actual colors. —— —

SR - : “oe ees — i SSeeeeeeteeeseeee Steseteeeeeeee SSCS CEESE CESSES ESE E eee eee eeeeeee*teeee

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128 POPULAR MECHANICS ADVERTISING SECTION OLD MAN STATIC |} - KILLED AT LAST Statichoke Has Startled the Radio World—Insures Clear, Long Dis- \ tance, Summer Reception The long promised invention which insures clear, long dis. ») tance, ‘summer radio’ without the agony of static, has just been announced. Radio experts and fans who have tested the . new invention, pronounce it marvelous. In addition to reducing static to a minimum, the Statichoke as this new imported invention is known, increases the vi as well as clarity of distant reception, sharpens the selectivity of tuning in, eliminates that harshness of the tubes so notice- able on local loud speaker reception and acts as a safety light- ning arrester. The Statichoke somewhat resembles a small transformer,

That Musical Pal of Mine Happiness, friendship, inspiration, popu- larity—all these and more are the result and by a system of coils it allows only the correct current ® ont: value to enter the set, choking out all other high current varia- of music. No wonder millions of happy tion from the aerial, which is passed off through a secondary people affectionately refer to the Hohner Harmonica as‘‘That Musical Pal of Mine’’. Anyone can quicklylearn to play a Hohner with the aid of the Free Instruction Book. You don’t have to tune it; it is always tuned. You can’t make a mistake as to tone for the tone is fixed. You merely breathe ground connection. A novel plan of distribution of the Statichoke direct to Radio fans is announced by the American importers, who have set aside 10,000 units for the purpose of ‘‘word of mouth’’ adver- tising at a special price of only $2.50 each on ten days’ free trial, with a guarantee that it will enable clear, long distance - reception throughout the summer. = If interested, write today to the radio department of Im- 9] perial Laboratories, 8152 Coca Cola Building, Kansas City Mo., and the Statichoke will be sent you by insured mail. Use it for 10 days with the distinct unde rstanding that if it does

~2 X«

into it the song that is craving expression ty a eames ene — G . ° not do everything c aimed for it in 18 article, you can return »~ write today as you do not risk a cent pictures and favorite musical selections. GAL. of “GAS” |- Leading dealers everywhere sell s 0) le-s than five minutes. The inventor, Mr. John A. |9 risk. Write him today. A co ile, light lamps, charge storage batter-

UP | ies, electroplate, ete., makes an — Life-size $ UNDER] machine for experimenting ‘at mote they w »perate heavy mode emery paper pat- wheels, and other appliances terns — You can build your own body at smal! cost. SLUNG pioWett $6.50 p22¥ett. $8.00 64 to 200 Watt Dynamos, Armatures, Commu PARTS tators,Punchings. Parts for S nd Students, We are man- | Send for Catato = Per Set LOOMIS ELECTRIC COMPANY j f $6.75 1427 N. Artesian Ave. CAGO. ILL. ufacturers and our quantity production enables us to quote exceptional! low prices. Our unique shipping methods |

It will boost your garage or service station businsee. Depe able Franklin Super-Single Stage Air Compressors are doing e it the country over. Write today for free illustrated booklet »© ' Mai save you 73% in FREIGHT CHARGES. Send at once for free partic- ulars on Central Bodies. Our Book: “HOW TO BUILD A FORD RACER” sent, anywhere on receipt of 25¢ in cash or stamps. WRITE TODAY! Central Auto Supply Co. Dept. 12°, Louisville, Ky.} | Sells for $1.2: 25. Agent’s Sample 65c! 2m "Foun ; Franklin Aids to Better Business. Franklin Air Compressor Work

Pen with Styloi

Guaranteed for , 1 year fi “It makes Carbon Copies” c Hustlers 1 ne $20 D. eo i 6T Money ~.e if you don’t think it’s the best pen you ever wrote with. Just out. Comes in beautiful brown trimmed in a black. Send for wholesale que

price list and distributing plans. F. SPORS & CO., 337% Main St., Lesueur Center, Minnese’® |

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POPULAR MECHANICS ADVERTISING SECTION 129 9 Ch Santa Fe Sp ecia gag 070 Crvediv ) i oS! iy Ve “> 4 , ba fs > %. 4 , .| iach - wT, e ; ;. -. Sa ae AE ea Ask for the Santa — : Fe’sLadies’ Bracelet }] ~~ Watch folder and t wf W E will send this famous watch direct to you, express prepaid on FREE Diamond folder. Approval. Examine watch and be convinced it’s the best watch buy ow you ever saw. You save 14 to % your money by purchasing a Santa Fe Special Watch. We trust you—wear watch while paying for it. . Mail orn for FREE Watch Book— | Llip the coupon, fill out and receive the FREE WATCH | BOOK. All the newest watch case designs in white or ‘n gold, fancy shapes and thin models are shown. Read | easy payment offer. Select the watch you would like Please send prepaid and without obligation your ee, we will send it to you on approval, express prepaid. | Watch Book Free, explaining your No Money | SANTA FE WATCH CoO., 66 Thomas Building, Topeka, Kansas . ds — “7 own’’ er on the Santa Fe Special Watch ir the watch 30 days FREE—return at our expense if ae pio i , fully satisfied. Name SANTA FE WATCH COMPANY Thomas Building Topeka, Kansas The Home of the Great Santa Fe Railway Address

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130 256-page well - boun Piumbing and Heatin Supplies, Fixtures and items—illustrated and trouble-s saving kin coal in heating,” Every householder, mechanic, Shows institfiition how to save Water Supply System HARDIN-LAVIN 107-17 West Pershing Road CHICAGO ' Plumbing and Heating ne Write for your copy today without fail. Guaranteed Heating Plants Our Handy-Man Book shows how Hundreds of floor plans, e evations, diagrams, trade secrets, money POPULAR MECHANICS ADVERTISING SECTION Reg. Price 500 Brings you this big yelopedia-Catalog. Big d encyclopedia of 1z Outfits, Systems, Accessories— 10,000 ks. etc.,‘‘How to save **Easy repair methods.’’ 3 contractor, farmer, Hot Water Boiler needs this book. wages, work and materials. Big Handy Man Book Tells bow we help you plan and install From rough sketch or description we supply working plans and clear instruc- tions. We loan the tools needed Any handy man can install. This is the place to buy On money-back guaranty. Plumbing Outfits and Supplies; Water Systems; Hot~-A Water or Steam Heating Plants Radiators, Pipes, Boilers or Septic Dis- posal Tanks. Send 25e for Yours Today We have spared no effort or expense to complete this remarkable and instruc- tive book. To keep from sending it broadcast to disinterested persons, werequest a deposit of 25c, which will be refunded on your first order —or send for our FREE Bulletin. Write sone and save a Only $5 months—easy to mous standard W Kerosene, Gasoline, gine. Use Distillate or Gas. with celebrated Simplest and cheapest to operate. ing easy. 50°% surp! Sold FREE BIG NEW NINETY DAYS’ FREE TRIAL. today for my new illustrated engine book sent absolutely Free 69 a month eme fora few own the fa- ITTE En- Equipped Troubleproof W ICO Sizes 2 to 25 H-P from factory to us power, direct you WITTE ENGINE WORKS 1748 WITTE BUILD! 1748 EMPIRE BUILDING, - - 1748 WITTE BUILD! NG@,----- NG, - - - Magneto. New device makes start- all styles. on Write No obligation to you. a tab ciTy, mo. URGH, PA. SAN FRANCISCO, CALIF. gy “Made on a different inci- ple from all other Air-Rifles. The Benjamin is really a strong air- nn pump used to compress the air in the ) air chamber to any degree of power 4 desired. From one to six strokes of =" ie I amp give all the force necessary. Each —_; itional stroke gives increased power. The Benjamin works on the eame principle as all air-drills and air-hammers—with this difference: You control the sh: te >! Jorce as you de- sire. Look at this | > hardwood. jt shows how Benjamin power is regulated as you wish. You can’t have accidents with a Benjamin It's safe, always, because you control t power. The Benjamin never loses shooting jorce, and has no springs to get out ot order or shake youraim. Write us for an interest. ing folder about this wonderful air-gun, If your dealer does Ask your not handle same, send — for emon- onatien, BENJAMIN AIR-RIFLE & MFG, Gay. Pacifie-Coast Representatives Angeles Calif., and AGENTS PROFIT _ GENUINE GOLD LEAF LETTERS guaranteed to never tarnish. on stores and office windows. large profits. Paul Clark says: Smallest day $ R. L. Reel made $920 in two months. Writ« for free sample and liberal offer to general a P METALLIC LETTER CO., 433-B N. Clark St, CHICAGO Mailing Lists Will | Bese Seat ree | tr, fT your best pros; ’ Sale, Professions, Business, So0cerns. NO % \———re ¢ “Ross -Gould coma st Lo Anyone can put t l:normous dé aah are selling at highest prices ever known. Greates at ake money renting them. No mixing f labor. no young to attend tart small, grow bie. Read how our customers sell squabs for $12 a dose been established for 24 years. Better look into t send now, at no cost to you, our big, illustrate telling how to make money breeding squab Plymouth RockSquab Co.,634 H.St., Melrose Highlan’ “ss “If I hac in't been all through it myself, I wouldnt have the assur- = ance to sap to 7 pou ‘cheer up.'” ERICKSON. Those who wear them say: ERICKSON LEGS are Wonderful because they do not chafe, overheat or draw end of stump. If you have had a recent amputa!io new booklet on TEST LEGS for bes E. H. ERICKSON (¢ 38-A Washington Av. * MINNEAPOLIS ~* MI! ~ os Do ef = 4 me

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the mg |) POPULAR MECHANICS ADVERTISING SECTION 131 “Brought Me ™. This Genuine %&. a UNDERWOOD" Ye only $3 brings this genuine Shipman- Ward Rebuilt Standard Underwood direct from our factory, and then only small monthly payments while you are using it. / Thoroughly tested and guaran- : teed for five years. EASY Monthy Little more than rental. Balance of payments so small you will hardly notice them, while you enjoy the use of this wonder- ful machine. You don’t have to scrimp and save to pay cash. All at a big saving to you. Five Year Guarantee With every typewriter we give a written guar- antee. These machines are rebuilt like new by the famous SHIPMAN-WARD PROCESS. Equipped with late improvements. You can’t tell them from a new machine. The world’s standard typewriter, the same models as sold by the Underwood Type- writer Company today, at a big saving to you. Act now! Get this splendid offer and save money. From Factory to You These machines are shipped direct from our face tory—the largest typewriter rebuilding plant in the world. They are rebuilt by the famous SHIPMAN- WARD PROCESS. Developed through 33 years in the typewriter business. Through our money saving methods of rebuilding and elimina- tion of a large expensive sales force we are able to make this wonderful money saving offer to you. ACT TODAY, take advantage of it Boo ts and you will SAVE MONEY. Free ha om of F - explaining Shipman-Ward’s won- derful system of rebuilding type- - writers. We show you exactly how it’s done. How you are able to buy them. Complete and valuable in- aaa TRIAL COUPON formation about the typewriter 4 industry, both instructive and educational. SHIPMAN-WARD MPG. CO., A212 Shipman Bidg., FREE a Every MOontfose arid Ravenswood Aves., OUR FACTORY » Sopewee Chicago. A complete course in touch type- Send by return mail your wonderful All Shipments made direct to you writing. You don’t have to know offer of Shipman-Ward Standard Rebuilt fi od fi h how to operate a typewriter. You Underwood, also your book of facts. rom our modern ftactory— the can learn to operate this machine (This is not an order and does not obligate largest typewriter rebuilding in one day. We also give free a me in any way.) a h waterproof cover and all tools that plant in the world. come with a typewriter. PON s 6 00 00cnnGnctentncseenteneeess SHIPMAN-WARD MFG. CO. : A212 Shipman Bldg., Montrose and Ravenswood Aves., Chicago 2° '"°"'* +++: ss serrrsrrr sere reeerees oe 33 Years in Business gms © Post Office.....ecceeeeeeecd State... °

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rE 132 POPULAR MECHANICS ADVERTISING SECTION Never in three quarters of a cen- tury have we offered such amazing bargains. Hundred of | | } | Male to Order introduce unbeatable money ~— saving pageants in a argai i al 1 I - Ged iar | | SEND NO wrap crs PROGRESS Here’s why we can offer such MON EY tailoring we offer, for remarkable values: This 75 year tailored tomeasure old firm—rated at over $1 ,000,000.00 any style suit of odie pti delivered post-} capital — the largest and oldest aid. We Guarantee Satisfaction or Money © diamond banking institution of Back. : wonderful values up to $39.50. its kind in the world has made loans on Diamonds, Watches, and AG E N Ts eer WANTED bors. wre explain “how, ‘no other jewels in excess of 000 svure,etc. Complete outfit ' simple REE, write Why Pay Full Prices directions F te at once. SAMPLES Costs Nothing to See Thousands of unpaid loans. Must li now. _Diamonds, Jewels, atches and other Gems of un- usual qualities — at an entirely different price basis— viz: loan values not market values. Atour risk we send you any bargain you wich for [73d vee goon gation. No obligation, is ss — of 8185 The Magic Mender per a yt even lower Fh, See a “ T’arns stockings, mends clothes, pat all fabrics, rubber and leather. | away with drudgery of darning mending. Does the work cheaper, « auicker. Stands repeated was Send 50c for full size tube. Money if not satisfied. Agents oou0 i of un 8 and other soars e A ne. ad oy Nie cash DARN-IT-ALL COMPANY cu gem described in full itters. very detail with exact weight. color, quality, ° i ee Examination er. No obligation List is free. MAIL COUPON NOW | 1933 DeRoy Bldg., Pittsburgh, Pa. Without obligation, send m- free, your latest Bargain List of r factory to wearer. Diamonds, Watches and other jewelry Easily sold. “Ove r one million sat- iafied wearers. No capital or experience uired. Large steady income. Many earn $100. to $150. weekly. Territory now being allotted, Write For Free Samples. Madison Shirt Mill, 511 B’way, New York AN OPPORTUNITY Responsible Middle Western Manufacturing Institu- tion desires to get in touch with inventors or sm manufacturers with view to buying outright manufacturing on royalty basis. icon. bronz iron, steel or aluminum preferred, but will consider any article having merit. Address MANUFACTURER, Box 300, Popular Mechanics NR | BA ins PUN Puts ! WORLDS LARGEST Te eaiias = 4 EASIER 22234203, the result of exclusive Conn pro ; Name.... SERRE REE EEE REESE EEEE ESET EES EEEE EES COEEEEEEESESSSEEES Every Boy Needs Them To hang to the walls of his room his pictures, drawings or charts. MOORE PUSH-PINS Glass Heads — Steel Points Moore Push-less Hangers ‘* The Hanger with the Twist”’ Easy to use; won't injure walls. 10c pkts. Everywhere MOORE PUSH-PIN CO.., Philade!phia, Pa. esses, speed your progress, £1 L you quickly the pleasure a! Is Do you want proof or profit of. personally played musi ie claims? Even without ex- Used and endorsed by the world’s perience or investment you greatest artists. can start a permanent, profitable business for yourself. You can prove this state nt FREE TRIAL: £7;” mentson any instrument for baudor orchestra. Send today for catalogs ” and details; mention instrument x Cc. G. CONN, Ltd. 631Conn Bidg., Elkhart, Ind. W ite today for full particulars. TANNERS SHOE MFG. COMPANY 5-410 C Street Boston, Mass. uses and endorses the the Conn

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rr

| of Chicago. Don’t hesitate. Fill out the coupon ' has. Cayton —“! sold twelve tubes trial State POPULAR MECHANICS ADVERTISING SECTION 133 500 PUNCT| URES, Yet Leaks /

A new Puncture Proof inner tube has been invented by Mr. 8. G. Milburn of the Milburn Puncture Proof Tube Company, Chicago. In SZ actual test it was punctured with 500 nail holes without the LOSS OF AIR. This amazing new inner-tube increases mileage from 10,000 to 12,000 miles; eliminates chang- ing tires and makes riding a real pleasure. Many users have run over 20,000 miles without removing a tire from the wheel. These wonderful, no-trouble, puncture proof inner tubes cost no more than ordinary tubes and Mr. Milburn wants agents everywhere to help him introduce them. CAR OWNERS WANTED To sell and demonstrate this wonder tube. Interests every- one immediately. Automobile owners buy on sight. It makes no difference what car they drive or what tires they use. Our salesmen are coining money on our “DIRECT FROM FACTORY” scheme of selling. Absolutely no competition. We control all basic patents. No capital re- quired to start. Previous selling experience not necessary. EARN $5,000 to $10,000 A YEAR Re ad Wh at These Earn $5,000 to $10,000 yearly or more. Get into business for Men Sa y yourself. Sell Milburn Puncture Proof Inner Tubes. Every car owner is a prospect. Your field is unlimited. Get in while it is good. Be independent. Find out all about it now 74

J. D. Cooper—‘I have made 30,000 oe . . es with oe Mtn Panrtune Pros and get started at once. Then you will be ready to make > ibes and have not as yet removed a rim big money when the heavy spring selling season starts. 4 e casing and my casings are still ia excel casing and ¢ phe FREE TUBE wie ‘orm 4 ® .*,% J. C. Jerves —“I sold 50 Milburn Tubes : oe eee 1 the first three days.” Send coupon or write today for special free tube FDS FES ffer and further details. References, Indus ALA offer and further details. ferences, Indus- 4

. ey A pee - O°. Bank of Chicago, National ¥ Ax: Ke Bank of the Republic, Chicago, Baker State Pank 4 Of # eo 4 “ .) y@terday in ten minutes. ‘ L. S. Knapp —“ My first few hours out and send it in or write and send name and Z, I sold eight tubes, no trouble at all to sell

we will send you al! details. This is your qe: Py hem. The most wonderful tube on the opportunity so don’t delay. Address FOS 6 ‘oe narket today, I think. I am hoping you : 7 SAS Os Ss vill give me the agency for a big territory.” Ss. G. MILBURN, Pres. ow o re ,* 2 oe Ys te o . S29 D. Edelere—‘‘I have driven seventy Milburn Cuneture 7 ¢ ow os ve nails in one of the 30x3 tubes and Proof Tube Co. 2" eg XP venty were spike nails. It has gone 4S Sree bove the test that you recommended to 331 West 47th Street 4 2 VES S 2 e it would do.” CHICAGO, ILLINOIS ZEN PS ge i , oy 8 s Og ws o wo S : Q : , TE A TE Cad at > r C >

o% “A

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POPULAR MECHANICS ADVERTISING 2OXO-GASE WM AY ASA CS SWZ For Furnaces, Ranges, Heating Stoves, Etc. OX0O-GAS, the cheapest, made from kerosene or distillate, and air, mostly air. Burns with a pure blu: flame of high heatin use. Manufactured by the oldest (est. 1906), highest rated and most respon Oxo- ~— <i sible corporation. Askany bank. Send for Catalog illustrating and de GAS oil # a scribing twenty different, distinctive designs of oil burners for Furnaces, Cook burner GO < & Stoves, Heating Stoves, Base Burners, Hot Water Heaters, etc. Téa ‘ = & Agents Wanted Some choice territory for OXO-GAS agencies stil! for ranges § ee g open to thoroughly responsible parties. Your own locality may yet be unassign ed. i arrnions: GLORIA LIGHT COMPANY, 111-6 N. May St., Chicago, Ill. SECTION

cleanest, most efficient fuel known to science, is intonety. as silently as city gas. Over a million in es

Make"}0an Hour Your Profit in Advance ““Stay-Prest”’ Trouser Presser sells q“uick to every Man—thousands in use. Men and women are cleaning up big profits with this fast seller. Sells on sight. Priced low. 40% clear profit for you. You take or- ders. We deliver. Your profit in advance. Wonderful New Invention

Puts perfect creases in trousers. Takes out wrinkles and baggy knees. Easy to use-—takes less than half a minute. Folds into smal) size. Saves clothes and tailor bills. MAKE BIG PROFITS — OTHERS DO Jack Ames made $24 in four hours. Randle sold 25 the first day Mary Roberts made 410 in one evening. Others making big profite in epare or full time. Se can you ou risk nothing. We start you

FREE Write quick for- FREE selling outfit and full details of money-making selling plan THE GETGEY-JUNG CO., G-121, G-J Bidg., Cincinnati, O RAISE BELGIAN HARES NEW ZEALAND eS nen See Giants

MAKE BIG MONEY—We cupply stock Pay you following prices for all you raise Iwian ees 2 each ew - 4 OF $3 each inchillas $4 each— Flemish Giants $5 each ge fllustrated book, catalog and contract, also a Ge ‘so orenes magazi..e, tells how to nase se skunk, min fox, etc., for big profits, all for 10e. Add OUTDOOR ENTERPRISE CO., Box 25, Holmes Park. Mo.

SEND ONLY $1.00—we’ll send this beautiful 18K White Gold Ladies’ Dinner Ring set with 8 sparkling brilliant, blue-white dia- monds fora 15 DAY FREE TRIAL, to duplicate it any where atour price. If you are convinced that it rep- resents exceptional value, pa $4.75 monthly—price $48.5 50. Otherwise return and your dollar will be sent back ime mediately. ae slightly enlarged No Red Tape— No Delay FREE— —* com lete catae og € yi Transactions Confidential Watches, Jewelry. ; Te ~~ Rush Your Dollar Today topayoneverything. Sendiforit

AUTHORIZED CAPITAL £1,000,000 LW: ‘SWEET INC.

BROADWAY, NEW YORK

FUGO f Automatic Extinguisher | Be prepared to put out a fire in your home, store, garage, shop or auto. Fu is reliable, instantaneous in action, k | lived, rechargeable. The cheapest protect you can buy. Foil the red menace & ta F / today. Send $2.00 with order. Balance C Agents Wanted—Wonderful cen ah The National Formetal Co. |

CLEVELAND, OHIO.

227 St. Clair Ave., SWEATERS (iotGoy scotia Women, bb Scheele Clubs, Teams Order direct from mull. Save 20% to 30%. Any style, co size, from stock or to order. Finest virgin wool, Send now f: catalog of big bargains, Special offers to schools, clubs, t« AMERICAN KNITTING MILLS, 1538 Clybourn Ave,, Dept. 46, CHICAGO

Saleswomer—Salesmen! Make big money taking or- ders for our beautiful Dress Goods, Silks, Wash Fabrics and General Yard Goods Large Book of Fabric Samples fur- nished to Agents. Write today. National Imp. & Mfg. Co. S73 Broadway, Dept. 6, N.Y. City LEX ACTUAL FABRIC SAMPLES NEW IRON! Cuts ironing time in half. Saves steps. Quick, regulated heat. Beats electricit or gas. No cord. No tubes. Low priced’ Ends hot stove drudgery. Easy, cool, comfortable ironing. Use anywhere, in- doors or outdoors. Dependable. Lasts a lifetime. Guaranteed.

Send x“ Write i 30 Days Free Trial f°) p2.27"%icodr ee AGENTS and Free Trial Offer. Just send name and address. No obligation. Write for THE AKRON LAMP CO., 36 iron Bidg.. AKRON, O. Offer

30 Days’ from y Free Trial famous Ranger bicycies. Delivered free on approval, express prepaid, at Fact Prices. You can easily Baveéi0 to @25 on your’ bicycte. Prices 923,09 and far

y Ranger if - XY advance first . at factory prices, .. Lamps. t, low prices. No foney.de! Cusinees and egaiumest” ‘of % Write todas fas for free Ranger ©: COMPANY = DEPT. §. CHICAGO

ortes | arvel- i FT ent terms

in om ne

Writ FRE

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POPULAR MECHANICS ADVERTISING SECTION — | eh Stop that leak in a jiffy with SMOOTH-ON No.1 JAKES no difference whether its water leaking from the hose connections or radiator; oil or gasoline from the supply lines; or gas from a loose exhaust pipe, Smooth-On No. 1 will produce perfect and permanent tightness in a few minutes. Use it also for keeping grease cups, lock nuts and hub caps from dropping off, and for perfect sealing of cracks in bursted water jackets. Write for free copy of the Smooth-On Automobile Repair Booklet and get Smooth-On No. 1 in 7 oz. or 1 or 5-lb. can from any supply house. SMOOTH-ON MFG. CO. Dept. 37, JERSEY CITY, N. J. Write for FREE BOOK MOOTHO Beautiful HOUSES $900) . and BUNGALOWS CAN BE BUILT FOR AND UP and many others in my new book, ng Plans tor Modern Homes, will save indreds of dollars. One of the most ete ree omprehensive books of plans d by any architect. New edi- 5, et , costing from $200 up ;+gives ARCHITECT and cost to build. Sent postpaid for $2.00. 101 TremontSt., BOSTON, MASS ist one N D0 fic Yorn yin Colonia FREDERICK H. ora DEAFNESS IS MISERY I know because |] was Deaf and had eas Noises for over 30 years. My invisible Antiseptic War Drums re- stored my hearing and stopped Head Noises, and will do it for you. They are Tiny Megaphones. Cannot be seen when worn. [ffective when Deafness is caused by Catarrh or by Perforated, Partially or Wholly Des- troyed Natural Drums. Easy *» put in, easy to take out Are “Unseen comforts.” Inexpensive. Write for Booklet and my sworn statement of how I recovered my hearing. A. O. LEONARD, Suite 226, 70 Sth Avenue, New York City ADDING MACHINE VEST POCKET SIZE BABY CALCULATOR UBTRACTS MULTIPLIES DIVIDES NEW Does Work of $100 Machine. Total Visible at all Times. FREETRIAL—Send No Money Anyone Can Operate It. Guaranteed for Life Just write ‘“‘Send me a Baby Calculator’’ and give your name and address. We will ship it immedi- ately, all oa prepaid. On delivery pay postman $2 50. You can return it after 10-day trial for full refund if the Baby Calculator is not the i Fhisisthet time and labor saver you everus hine made. Order today. BABY "CALCULATOR SALES CO. P. 0. Box 118, Chicago, Mlinois 135 CHree! Beautiful book shows how easy it is to play a Buescher. Gives first lesson. 64 illustrated pages. Put Yourself Here in 60 Days You can do it! It’s easy. You don’t have to be ‘‘gifted’’. If you can carry atune, whistling or singing, you will find it almost as easy to play a Boescu: CTrue "Tone Saxophone And the music of this sweetest of 4.1 wind instruments will make you the most sought for, the most popular man in town. Easily played, soft orloud. Perfect tone in all registers, warbling and screeching elimi- nated. Simplified key arrangement. Persons who have never played any instrument commonly learn scales in an hour and play popular tunes in a week. Six Days Free Trial - Easy Terms Try a Buescher six days free in your own home. See what you can do with the instrument itself. Make this test. Easyterms. 3 lessons given free. Send the cou- pon. Get the particulars. hey may be your key to untold pleasure and profit. Clip, fillin and mail today. BUESCHER BAND INSTRUMENT > Everything in Band and Orchestra Instruments 806 Buescher Block Elkhart, Ind. Easy to Play - Easy to Pa TS 806 Buescher Block, Elkhart, Indiana described above. Check here «en ype ——— — ae ae eee oe BUESCHER BAND INSTRUMENT CO 7 | | Mail Gentlemen: Without obligs then to me, send your beautiful book ‘‘The Story of the Saxophone’ ’ If you prefer other literature describing other band or orchestra instruments, check b« low. | Cornet [) Trumpet J Trombone ([] Tubal) { PI SE SINE. c ccc ccecceccesccesccstooneneseosess Write plainly, Name, Address, Town and | State in Margin Below |

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136 POPULAR MECHANICS ADVERTISING SECTION Puts This Motor on Your Boat Only $37.00—then no more rowin —no more blistered hands — aching muscles. Our “Pay as You Play” plan makes it easy to take care of the balance. Covers any Caille motor, Ask your dealer or write us for details. Speed in Speed changes made mechanically and positively by raising or lowering steering handle in ratchet. Provides high oneal te rward, trolling speed, fast reverse, slow reverse and neutral. Witen set at neutral, motor runs while boat stands still. Ex- clusive Caille feature. Other Features Twin cylinders—no vibration. Light weight. Zenithe art uretor. Eismann magneto. Motor tilts over obstructions. Rope starter. Beautifi - ish. Fully guaranteed. Send for details—now. THE CAILLE PERFECTION MOTOR CO. 6318 2nd Boulevard Detroit, Mich. An Umbrella Tent Deluxe~ | Waterproof | Mildew-Proof | For Life With or without Center Pole. Light—compact— erected in 5 minutes by one person. Buy direct from factory of largest tent we mee Perfect manuf: a rs in world. Vv til ti Save Z Satisfaction entiation guaranteed or moneyb: ack. Rain-Proof S : _— ‘ Send for Free Booklet of Vacation We hot a Equipment No ho uffy ont U.S. TENT & AWNING CO. ster “it rains |) 731 No. Sangamon St., Chicago, Ill. ONLY Starts YOU Paddling — S 2 0 a Kineo Special KENNEBEC DowN CANOE Our new EASY PAYMENT PLAN enables any responsible person to buy for a small sum down, balance monthly payments. 16 models to c hoose from. Strong, staunch, easy to paddle. Beautiful designs and finish. Years of fun at low cost! Popular everywhere for fifteen years. SEND NAME for FREE CATALOG IN COLORS: Mention dealer. Kennebec Boat & Canoe Co. Dept. PM-1 Waterville, Maine ‘Old Town Canoes° Where’er the smiling stream may beckon Get an “Old Town” this summer and realize the joy of a truly fine canoe. “Old Towns” are beauti- ful canoes. They are patterned after real Indian models. Invest in an “Old Town” today and you will re- ceive dividends in happiness for years to come, “Old Town Canoes” are low in price. $64 up. From dealer or factory. y : 7 The 1925 catalog shows all models in fyll colors. It is free. Write for your copy today, Orp Town Canor Co., 1566 Middle Street, Old Town, Maine, U. S. A, SEND FOR THE INTERNATIONAL CATALOG Our net price Full line of a bodies and access for Fordsat W hol: Prices. Save money on bodies buying Direct Factory FOR FORD—Prices voms $27.85 Seotery to consumer direct— Only One Pro international Body Works, 914 W. Ohio Sree, Dept. 7, Clicago, llinois Eels, ie Mushrets and other anir large numbers, sure with our new fol: Galvanized Steel Wire Traps. | C ' | Fist catch them likea fly -trap catches fies v for our FREE TRAP offer, bargain catalog of Fishermen's Su; and Reeipe for making best ture known for eatching fish. Agents We WALTON SUPPLY CO,, Dept. A, 8T. LOUIS, MO SEND NO MONEY ass White gold top. Gold Emblem (ony Lodge) or any Initial (OldEnglish), yellow or white gold, In- laid in Genuine Also, in Black Onyx No. | Send size of finger and ring This . Trade Mer* will be sent for inspection. guarantees you genuine diamor Send for Free Catalog B FC M & Wi Any Lette’ BUFFALO JEWELRY MFG. CO., “THE MAIL ORDER HOU: Dept. P 501 Washington St. Buffalo, N WALTON aaa St ep Oaet rere TK5 wm Vrs. _

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ct— amor y Letter HOUS: o, N POPULAR MECHANICS ADVERTISING SECTION ¢ World’s Best Roofing at Factory Price Don’t buy Roofing of any kind until you get our big Free Roof. ing Book, describing full line of Edwards Famous ‘’Tightcote” Galvanized Roofings, Sidings and Ceilings, and our lowest fac- tory prices. Then see for youseel’ how much we save you by selling direct and saving you all in-between “REO’ [pues EDWARDS Metal al Shingles JISA TS or a o ou can’t flvaniain 1g. 5 eee iaa pecan Priced Garages Wide = a ‘ortable Pay os — eee rite can 4 bars} a money oo pap Fo‘ nceding Bool! No“: mandy Samples & Book THE EDWARDS MFG. CO., [Fas 600-650 Pike St., Cincinnati, O. . Forming a Company? if starting a new business or reorganizing one you may ind it expedient to organize on the Common Law plan inder a Declaration of Trust. The economies and dvantages are set forth in ‘ D-53’’—a pamphlet nailed free upon request. C. 8. Demaree, pub- sher of legal blanks, 708 Walnut, Kansas City, Mo. $75 to $150 WEEKLY | INSTANT WELD Welds Rubber Instantly. Beiter, quicker, and easier than vulcanizing. Once on—always on. No Heat or Cement re- quired. Repeat orders sure. Big profits. Ap- point sub agents. Write today. Tovaists pumps MFG. CO. Desk No. 40 Minneapolis, Minn. Why pay a high price to have New Top put on your car? Re cover it yourself very easily, and save $15.00. Just send name, year and model of car. We make Top te erder and se nd it to you with com- plete simple instructions. It's a snap and will Make Your Car Look New Improves appearance of car 100%. Greatly increases ite value. No middleman’'s charges—that’ 8 why we can ship direct to you at &n amazing saving Write for FREE Style Book showing money-saving prices on tops and other Auto accessories. Semptes free BUOB & SCHEU, Dept. A-6, CINCINNATI, OHIO The magic of make-believe Gs a boy a toy pistol, and first thing you know he is playing robber —with a handkerchief for a mask. Equip him with a Corona Type- writer, and just as readily he acts the part of business man or author. Play is real life to a child—and that is why parents should provide play- things that start right habits of mind and body. * * * * Every home should own a Corona, and every child should learn to use it as early as possible. With Corona a child will teach himself to read, spell, punctuate, and co-ordinate mind and muscle. If hehasa talent for writing, Corona a will help bring it out. And just incidentally, the grown-ups will appreciate Corona quite as much as the youngsters. Corona Four costs only $60. Easy terms if desired. Look for Corona in your phone book or write Corona Typewriter Co., Inc., 108 Main St., Groton, N. Y. 137 Please Mention Popular Mechanics

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138 POPULAR MECHANICS ADVERTISING SECTION

SOTO RE MERIAEE RTOS OEROERDEDS@OTREGDIEDELICS HTIERNUOODTRAREATI RR ARELHTinienay | AGENTS spat Pt PLUG Visible Flash Just Out— Amazing Invention — Beacon Lite Spark Plugs. You — see the flash of each explosion in ““"B_ the cylinders. Tells which are firing right. ss Greatest improvement in spark plugs SS since gas engines were invented. Won- - derful gas savers. Agents coining money.

——s

Easy to make with new sure-fire plans. Sells on sight to every auto owner. Phillips, Ont., = writes “Sold 2 dozen today, 3 dozen yes- " f terday. Rush 10 dozen.”” Write for spe- ame cial Free Demonstrator Offer and FREE ir 1. eS deal to introduce these wonder spark plugs in your territory. Write quick—t Yy- CENTRAL PETROLEUM COMPANY 643 Century Buliding land, Ohie FORD Owner's Del) a fe Every Ford owner —. when you show him how a NEW-RODE WATER PUMP for FORDS

ONLY a very modest investment is needed to put you in a clean, pleasant, profitable business selling bicycles.

Be your own boss!—Make money! —Get set for the future! —Stop Working for somebody else! — Realize your ambitions!

There is a big demand for bicycles everywhere these days, at a good forces a big stream of water so fast it ends over- ae ar ae os" heating, prevents freezing, makes engine work bet- proht for dealers. You'll be surprised ter, saves oil, reduces repairs. Our men are making > ° equipping Ford cars with these fast sell- how lit tle it takes to set up your own BIG MONEY ; ne Pumps o¢ $5 Put gn ina few minutes. . . ‘ . > tagency, equip rene car, li raw crow make business. Now’s the time to get in. pt Keep big share for your work. Exclu- 9 = Trito Good men wan everywhere rite now. Don’t waste another day—write for - JENKINS VULCAN SPRING CO, 534, North 8th Strost

interesting particulars to Dept. 252. Drive This p= em Beautiful Raceabout CYCLE TRADES OF AMERICA, Inc. a [instead of your OLD FORD Choice of Four Colors 35 Warren Street NEW YORK Fiat or the Bullet Nose ©_ S) Radiator Shell. Ser TT

for 1925 Free Catalog of New Auto Acces BodiesandSpeed Equ ment Direct from Seder AMERICAN TOP AND BODY CO., Park ie N “STOP cnsketnarr END-PLAY! ark Ave., DELPAI, IND C-A ADJUSTABLE BEARING corrects and prevents *f end-play without removing motor. Eliminates many tr oubtes. Fasy to inst: all imply drop pan. Only ' Fishing facts and hints. ry Tells how to compete in $3.7 deale sent prepaid ADJUSTABLE BEARING CO. Dept. P BRAZIL, IND. our annual $2,000 Fish- Photo contest. A postal gets it FREE! SOUTH BEND BAIT COMPANY - DIA MON D | 3583 High Street South Bend, Ind. e AGENTS WANTED—cSet HusHeEs ‘ ““WALVE CAPS A few cents a day will pay Fastest selling article on the market today. Big profits with a for this handsome ring minimum of effort. Retail price $1.25 per set of five. Simply send S2'to us} wrue a Ailox Rubber Co., 2512 W. Monroe Street, Chicago 'GUARA MOTORCYCLES | GUARANTEE LESS THAN HALF COST. Absolute satisfaction; if you ps agree this ring is an mazing bargain, we will Ace, Indian, Cleveland, Harley- Davidson, Henderson Motor- cycles and Sidecars, new, — refund your money. If satis- fied. pay balance in 10 equal ind rebuilt. Rider A < = = SEI wy Wanted. Write for FRE oon al ' \

Brings You this Genuine

7 Lady's wide top Solitaire. Latest Style “— 18 K. white gold hand en- graved and pierced ring ¥ gives the blue white, perfect Jj] \ cut diamond extra brilliance and large appearance fs Regular price $85 spe- cial bargain price only 250

monthly payments.

—_——_—_— Catalog showing bargains in Diamonds, pea Write and Jéweiry from $10 to $1000 Cash or lib- | =

credit terme t. + oe . pean neh oa AL UES. 6 i offer, agent's free outfit and big bargain bulletin. New Amert- vat can Bicycles in different styles rae. AE R S O and colors. Write for illustrated 7 * - catalcg giving our money saving prices. = tap 4 ae , en OA) PAN 00) of) Mm Ova 00 | MEME) DA A (©) 04.4 AMERICAN MOTOR CYCLE CO. t 2047 W. Chicago Ave., Dept. 629, Chicago

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qu D> Factory IND _HAMILTON LEAD CO., HAMILTON, POPULAR MECHANICS ADVERTISING SECTION 139 **919”’ the drop-forged large capacity wrench No broken jaws or sheared threads with this new Crescent Auto INCHES Wrench! It is made to last. Entirely drop- forged, including the jaw, it stands terrific strains. Covered by The Crescent Guarantee very Crescent Tool is guar- anteed to be satisfactory in every res —— purchaser to be the judge.” The new 019 Auto Wrench i is 59 inches long and opens to 3 inches. It is attractively polished. Retail price 75c, at hardware and accessory stores. CRESCENT TOOL COMPANY Originators of the Crescent Wrench 210 Harrison St. Jamestown, N.Y. wf CRESCENT TOOLS “Saws in the Shop,” “Saw Sense,” “Saws on the Farm”; just send your name and address, and say which of these help- | ful books you want—and we will send it FREE. |E. C. ATKINS & CO., Dept. P, Indianapolis, Ind. SOLDERS ALUMINUM of any description. NO ACIDS OR FLUX NECESSARY. For home, shop and garage use. Your tool kit is not complete without HAMILTON LEAD CO. ALUMINUM SOLDER. (Nameon every bar.) Send 25c for 2 six inch bars, or $1.00 for 9 bars; postpaid. OHIO SERVISTEEL TAP AND DIE SET, ONL ONLY$3.75 FOR THE HOME—THE FARM—THE W No. 82 Automobile ‘urnished aan ae h be tains 8 emg St Pace eee Tels and Le). kn the SAE. thread, idie coal and reamer wrench No. 31 Set is the same as No. 82 except that the thread Is U. 8. 8. vad of 8. A. E. You are purchasing a splendid set at a very low figure. Seed us your wa Ss at once and be one of our many spteted customers. Let us also our sivemtore @ Mustrating our full line of tools. Forcester Steel Products Co., Dept. 40, 25 Union St.. Goranten, Mass. U.S.A. ne _ Maybe his wife was right He had ability, he dressed well — but several recent opportunities in the office had gone to other men. Maybe his wife was right. She had tried to be tactful when she told him— and now he was going to do something about it. Nearly all young men are inclined to have a grimy-looking skin, spotted with blackheads and dull j in appearance, Few realize that this hinders their success in life. Pompeian Massage Cream helps you overcome this handicap by giving you a clean, ruddy complexion. Clears the Skin: Pompeian Massage Cream thoroughly cleanses the pores. It helps clear up blackheads and ——. by stimulating healthy circulation, and by keeping the skin clean and the pores open. Easy to Use: Rub it in; rub it out, After shaving or washing, rub it in gently. Continue rubbing and it rolls out, bringing with it all the dirt and skin impurities. Result—a clean, healthy skin with clear, glowing color. Your drug store has it. Use it regularly at home. SPECIAL OFFER 4 of 60c jar for 10¢ For 10c we send a special Trial Jar containing one-third of regular 60c contents. Use coupon below. iT ilk = The Pompeian Co., Cleveland, Ohio, Dept. 23 Gentlemen: I enclose a dime (10c) for trial jar of massage cream. Name Address City en

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la 140 POPULAR MECHANICS ADVERTISING SECTION LEIN’S are good husky pliers, the favorites of expert mechanics. You can’t do better than follow their lead. Your hardware dealer knows. Don’ tsend a single penny. fend ays Pree Trial, When he ring comes, examine it —if you are not convinced it is the Greatest Bargain in America, send it back at our expense. Only if . pleased, pay 20% as first for this payment--then send Ve i weekly—at the rate ofa Diamond ; few cents a day. This | E a y Bargain Cluster Ringwith | go 7 Blue-White Perfect | Cut Diamonds can be F } yours.Nored tape. Norisk. reoin Send forittoday. 4 Million m Dotiar Bre: FREF It pic eames thou- | sands of ete Address Dept. A-177 J.M.LYON &CO. 2-4 Maiden Lane N.Y. TURN WASTED TIME | _— INTO MONEY! Every Purchaser Finds Numerous Uses for the Torit Acetylene Torch a 13 Uses cAcetylene only. No oxygen or air pres- sure is required. Tips suck in air. Simply Mathias & Sons | | connect to Presto auto Chicage IN USA | tank, light gas, and the outfit is put to work. Beats anything you ever ————a tried for soldering, heating or light brazing. SS S | Outfit consists of 4 tips for different kinds of work, soldering copper, 5 feet tubing, tank connection, and full instructions. ahout their ST.PAUL WELDING & MFG.CO., 17711”. 3rd St., St. Paul, Minn. CORNWELL T OOLS | CALCULATIONS in Office Shop can be instantly made w A hundred thousand men boast that La — * sie tt _ at icives Seats smabere CORNWELL Hand Made Tools de mals, whole-numbers, roots, powers, Logs ‘ j work no other toolscan do. They'll i t i is of these rules are us ’ ' show you tests other tools can't stand ‘ sommes, Clue lees . t t , ealeulator eve Try these amazing tests yourself at our If you have any ficuring to do, order . Use these tools in shop and home Slide Rule or . Made of alaminem wit a oney back guarantee on every yn white celluloid. Sise 4 CORNWELL Tool. Se an tee he eee | Your money back if you are not Finest Tools in the World —— GILSON SLIDE RULE E co., Niles, Mich. CORNWELL Tools made of finest | - - Swedish Charcoal Process Molyb- denum Steel, from our famous Corn- PROTECT YOUR TOOLS FROM THEFT Write with electricity any name or design on the well secret formula. Forced, heat hardest and finest tools — iv arene nt treated and hardened and tempered in oll. Made by hand, NOT drop forged and case hardened Try These Strong Tests Cut vise handle shavings with bearing & scrapers. Drive % in. flat chisel through | metal, like writing on peepee GFF et $35 1 ‘4 in. machinery steel. Won't damage Complete Outfit $3. SO — Prepaid Anywhere €—_ ie > we Many other tests described in Interesting illustrated circular free. Write — (-4 , SEN ooklet y- ted. NA ARKOGRAF PEN "e0.. NT E. Stark St., Portland, Oregon 9 —a, or (ee MAIL THE COUPON! — Get special illustrated booklet;and prices - now. Then order. If you ever saw tools as good as these return your order and money refunded. Mail coupon at once. ee CORNWELL QUALITY TOOLS CoO., | Dept. K, Cuyahoga Falls, Ohio. | —— i ae Send me illustrated book'et with prices on Cornwell Secret Formula Hand Made Tools Operate a Tire Repair Shop 70,000,000 Tires in use. Ameri- ca’s greatest opportunity for men with small capital. We aes everything— $100 and up sy payments. We train you Fr REE right at home. Start mak- ing money at once. s Write today r Free Book of Opportunity. Haywood Tire Equipment Co. 1344 S.0akiey,Chicage Occupation |

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€ POPULAR MECHANICS ADVERTISING SECTION 14) IN ONE MONTH A NEW BUSINESS—BIG BUSINESS A Business to Enthuse Over — The “IDEAL” Lawn Mower Sharpener A wonderful invention that sharpens lawn mowers scientifi- cally—quickly—perfectly; does the work as nothing else can. Fred C. Milkert of Roselle, lll., writes: ‘“The Ideal Lawnmower Sharpener | ay me in business, starting in the basement of my home and forcing me now the third time to move into bigger quarters. Today the dream of my life- a shop of my own—is realized. With a machine like yours and a little hustle any man can have a business of his own and be independent.” D. H. Noakes, Milford, Ohio, writes: “Several years ago I started sharp- ening lawn mowers ina 10x10 shed. Today l own a store of my own on Main Ave., No, 212, valued at $8,000.00. The ‘Ideal’ Grinder did it all.” No town too small. Lawn mowers are dull— You Start Now owners don’t know where to get them sharp- ened. Mowing the lawn dreaded because of dull or improperly sharpened mower. Lawn mowing healthful, invigorating and pleasant when mower is “Ideally” sharpened. You do the work scientifically—you are in big demand. Lawn Mowers Sharpened to Razor Edge— People glad—owners delight i la with A ml ‘sharpened’ on \an “ideal.” ¢ os 7 Le we = t —_ oe —_ > oe ick-c oe USE THIS—Mail it Today ness for yourself. Start now! A» ime te Company treets, Plymouth, Ohio Write Today—FREE >. sae sls +. once free Illustrated Catalo;; Detailed Jpastrated catalog nd booklet “‘Let George Say It.’ booklet “Let George Say ‘tome Write Today ! ny.¢ Mame The Fate-Root-Heath-Compa Bell and High Sts., jeath-Compa at Address

7 "000 vvsurg wyTi0d WO

If you want to be es wey e)e & 'e) A iy fee, bout your tools, eep them le ee ee e Rt 3 Bo 4

GERSTNER Tool Chest} | |More Thana Wrench. Better than Pliers Does the work of both. Instant adjust- There's one you can use and one ment. Unbreakable. Drop-forged steel. you will want. Write for free catalog. Saves time and trouble for mechanics plumbers, electricians, farmers, auto- | ; —psleer i mobilists, housewives. Grips, holds Jerslner 1) 6ns.. or twists anything round, square, or ° 418 Columbia St., DAYTON, OHIO hexagon up to one a eA yous CRESCENT ser rench now Wood Working Machines continue to steadily increase in pop- uiarity. Tell us just what you are

direct Noble & Westbrook Mfg. Co., Hartford, Ct

MONEY-BACK GUARANTEE

1S, Mich. mail circular. Band Jointers, Saw _ Tables, Planers, Planers & ¢ Matchers, Hollow Chisel Mortisers, Borers, Disk Grinders, Swi Cat Of Saws, Cut Off Table, Uni- versal Wood Workers, Shapers, Bingie End Tenoners. THE CRESCENT MACHINE CO. 93 Columbia St. Leetonia, Ohio, U.S. As Sales Agents Write for Special Discount

ite ereces Uae LOOSE CHAIR RUNGS FASTENED FOR ALL TIME $35 te $175. Easy Terms. 5 Year Guarantee.

Great Invention for Cripples. BE OUR AGENT ° 4 SEND BUYERS’ 252-P HENNEPIN AVE. with Wy . AMES TO WORMAN co. MINNEAPOLIS ty Trade Mark Reg. U. 8. Pat. Of NO GLUE, NO NAILS, SIMPLY. INSERT RELIABLE STANDARD MAKES] | that you can DEPEND on. Enjoy th«cloripus Box of 30 experience © going whereverese like— when- Assorted iB xof 70 Ty epee Sizes | Box of 130 35% to 50% lees than other Ox « op are sliehtly used. thoroughly overhauled HOLDEMS CO.. D t > or rebuilt. Send for cataloguts 7) Bs a ° ept. " MYEROW BROs., 161 Summer Street, Boston, Mass. Ne 15 Rertetew St. Boston, Mass. | ve ip ou WADE AMATEUR MECHANICS, MODELMAKERS, INVENTORS, STUDENTS ak A real machine tool for the home work bench— capacity dia. x 12” length. For Metal—Woeod ay BENCH Composition Materiais Turning Fac ing— Bo pring Beitting Winding ia sad Cutting pees —4 rong Shic s e tire v ot or <ok $58.00. m Not ques Slate hendeteoh, $26.00. pepe Qe headstock, $58.00. Com S LATHE plete line of accessories at equally low prices. Write for interesting free literature THE GEROLD CO., Dept. P-11, 120 Liberty St., New York

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142 FUrULAR MEUNANIUS ADVERLISING SEULIUN i “Been on a vacation, Bill?” “No, Jim — I’ve stopped smoking. Gained six pounds in a week. You know how I used to smoke—a pack- age of cigarettes and a cigar or two a day — it sure had some hold on me. But I’m cured—took a scientific home tobacco treatment—fixed me up in two weeks. ‘‘Wasn’t hard on me at all—noticed improvement the first day—lI feel like a new man. It didn’t interfere with my work—didn’t leave any druggish after-effects—the money I saved in the last two weeks has paid’ for the treatment alone. “Why don’t you take it? It has cured men like you and me for over forty years— it is a doctor’s individual prescription that sure fixes youup. Just send the coupon for full informa- tion NOW. No obligation. All correspondence is strictly ctors_ confidential.’ Prescription The Keeley Institute, Dwight, IIL Please send me, without any obligation on my part, your free booklet which will tell me how to rid myself of the tobacco habit. Every muscle out of alter More muscles aching than you knew you had—scraped shin, —- hand— sunburn. Apply Absorbine, Jr. for relie soothing, healing, cleansing, antiseptic. It ts an energetic liniment. $1.25, at your druggist’s W. F. YOUNG, Inc. it gaaee Mass. “= i, Lobsters, Eels, Mink, Muskrats an a Cc bere wire animals, in leeee i} rs, with By Latest Improve Folding, Galvanized STEEL WIRE TRA They catch them like a fly-trap catches flies. Stron mgly bal built. x) rit sizes. Ly today for Descri Price List, an Free and Bait offer. Best bait known for attractin: yall -> of fish. In fresh or sa!t waters. J.F.GREGORY, Dept.26, Lebanon, M a ostpaid $3.00. Money returned if rr satisfied. DISTRIBUTORS. Fortune right men! tee Id Exclo- Srientee like wikdfire! sive territory now rite Dept. 33. Propucts MANUFACTURINGCORP. DOES YOUR BOAT LEAK? Send for our Booklets, ‘“‘How to make Your Boat Leakproof,”’ and **Marine Glue— What to Use and How to Use It.’ JEFFERY’S MARINE GLUES IN ALL THE VARIOUS GRADES Any old boat so long as the frames are in f condition can be made watertight by follow the instructions in the above booklets. For sale by all Yacht, Beat and Canoe Supply Houses Hardware, Paint and Ou and Sporting Goods Dealers L. W. FERDINAND & CO. 156 Kneeland Street Boston, Mass., U.S. A SHAW MOTOR ATTACHMENT MAKES YOUR BIKE A MOTORCYCLE! A high grade 24% H. P. motor attachment quickly clamped any bike frame. Speed 4 to 40 miles an hour. 90 to 125 miles per gallon of gas. Special Low Price Now! Write today for Complete Description and Special Low Prices on SHAW Motor Attachments/ and the SHAW Complete Motorbicycle.\ } sang MANUFACTURING COMPANY ° Dept. Galesburg, Kansas skin can be quickly cleared of Pimples, Blackheads, ‘aan uptions on the face or body, Enlarged Pores, Oily or Shiny kin, $1,000.00 Cold Cash says § can clear your skin of the blemishes. WRITE TODAY for my FREE Booklet—*‘A Clear-Tone Skin” —telling how I cured myself after being afflicted for fifteen years- E.S.GIVENS, 129 Chemical Bidg., Kansas City, Mo. ji. om low 2 oe eo oof ol

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—_ —_ —we eee Ten Wwe Seen Spee Ss = a ee mm eae! TS FVETULAK MEUCMANIUS ADVERTISING SECTION 143 FREER Gi: WURLIZER in the little Saxony Sent You Every fees Secret in ALL the latest im- Maker. His sho was © gathering place proved apparatus is eS listed in our monthly bul- letin: “The American Radio Transmitter.” If it’s new we have it. Lowest stPrices in U.S. eal rs are the lowest | in the Unies States. All Gationaity advertised y money. Desiers, oe! latest. ble monthly Balietin hows one | tionally advertised f whee WERICAM RADIO MFG. CO. twain Si, De Dept. ©, Kansas City, Mo Demonstrate Once— Results Mean Sure Sale Coast tocoast, lowest prices,attrac- tive four-tube instrument $39.50. = Make $100 Weekly-sell RADIO — Big commission to you. Exclusive rove territory to proven salesmen. Ter- ) them ritory going fast, write today for today large illustrated book No. 100. — Don’t fail to name your county. Mo. ZARKA, Inc. } . 851 Washington Bivd. _ Chicase, mm. OU may now have any Wurlitzer instrument for a m veek’s free trial in your ®eeenvn0020080808082082°80 } eve 1y ——— TEXT BOOK own home. Examine the instru- 7 2) ATAL ment, show it to your friends, ot . ; SY & Cc isle play it as much as you wish. No ees obiigation to buy—no expense $s for the trial. We make this in f liberal offer because we want llowi i | 4 you to try for yourself these louse on lt oy “Ups wonderful instruments, the re- valores sult of 200 years’ experience in u.s.a ” v musical instrument building. “| ¢,_™ Build Your ‘Om with RASCO Parts Easy payments are arranged to suit NT RADIO SPECIALTY, Gc your convenience. This is your oppor ‘ tunity to try a famous Wurlitzer od @eee e@ © - . ¥ ver ee oy 6 wy e instrument in your own home. HONEYCOMB COILS one The Universal all-wave induct- New Catalog ance. Back and front pane mountings. Send 25¢ for Super | The greatest musical catalog ever pub» ot. © 8. and Heneveem> lished! Over 3,000 articles — every Coil’ Circuits and Complete known instrument described and illus. Catal trated; many of them shown in full atalog. qien. on you jownms ppetens ane al) etails © Tree rial, sy yment Chae. A. Branston, Inc. | pian. All sent FREE — no obligation . 8, 815 Main St., Buffalo, N. Y. Chas. A. Branston, lid., Toronto Send this Coupon {our 2 0 urs is the strongest guarantee! Use it 10 days. If not the finest s::s 42nd St., New York 7 ©: * Cincinnati ads, you ever heard, return it and get your money. Dealers Everywhere. Send me. sbenlatsly nee, yo your ae i pontine’ caf Scie HB Viernes . ion of every known ins’ men 80 me how may try _ Utah Radio Products Co. Sent, 0 ee ber yy tee any ipstroment in my ‘own home and pay for it in eaiall monthly sums Cold “s : g) =e Mer) RE ; f the This Radio Book Him = pO r _s of Bargains | B Radio Cata City. — -------------------- State_ _ _ _ after > A) aoe ea aie im radio y~ rears. - sembled sets and parts for « com . Instrument — —— ————-— ——~———— — —— — — — — —— — ~~~ —— =. Accesso ,— Valuab i ‘State Inatrument in which are interested) eeeceehecsetesseeeace of x | ‘159 W. Union v= one. Bor 5 S, Chicago Copyright, 1924, The Rudolph Worliteer Co.

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144 POPULAR MECHANICS ADVERTISING SECTION NOW/- EASY PAYMENTS y on Any Model EVIN NRUDE | VINRUDE now makes it as convenient to own an outboard or inboard motor as to own a motor car. Over 80% buy automobiles out of incomes rather than savings. Why not an Evinrude ? Why sweat at the oars when you can get to the good fishing in a hurry—any time? Why miss out on the fun of scooting over the water with a breeze in your face—exploring distant shores treating the kiddies to the health of the outdoors ? Why, when you can] “play” as you pay? BUY NOW— EARN EASIER TERMS The earlier you place your order, the easier terms you will earn. Write for copy of “1925 Evinrude Year Book.”’ See the advantages of owning a genuine Evinrude and why more motors of this make are in use than all others combined. Mention if interested in easy payments. EVINRUDE MOTOR CO. 330 Evinrude Bldg... MILWAUKEE, WIS. You Can Buy Any Model EVINRUDE On Easy Payments See the New 1925 Champion EVINS}UDE It Took 50 Years ~ of experience to make this “‘ Master Blotorch.’’ TURN TORCH Just a few of these patented features: Superheating Burner Raffle 400 déegrees more heat from kerosene o1 gasoline; Twin eeeste Control no orifice ouble; Automatic Safety Valve 8 can't explode. Fearlessly Guaranteed. postpaid A As sk your dealer or write for catalog ("TRE TURNER BRASSWORKG ) Industry Ave., Sycamore, Illinoi The World’s Largest Exclusive Manufacturers of Blotorches, Fire Pots and Brazers BIG CATALOG Thousands of Contains interesting Radio mt mation. Complete list of U. Broadcasting stations with space to log station. All hookups. How to operate sets. Construction of aerial. Write today. peruse et 27 W MADISON ST.Civcago Save $1 50 ON COST OF " NEW TUBES BY HAVING YOUR OLD TUBES REBUILT AT $1.90 Each Guaranteed equal to new. Send us your tubes by parcel post. We return parcel post, C.O. D. and try to maintain 24 hour service. Harvard Radio Laboratories 204 Old Colony Ave., So. Boston, Mass. Cut Prices on Radio Standard Sets, all types, $5.00 t Wiring diagrams a Save 25 to 50 per cent. $79.00. Everything in accessories estimates free. 150,000 customers. Money-back guarant: Immediate delivery. Illustrated catalog on request. Spe proposition to community agents. Radio Dept. 108 IMPERIAL LABORATORIES, Coca Cola Bidg., KANSAS CITY, MO AGENTS DEALERS WRITE Radio Batteries -they last longer Charges radio 2, 4 or 6 volt “‘A’’ battery, radio © battery up to 120 volts and an » batteries from socket. Average cost per charge about a n Solidly built—will not get out of order. Fool-s and simple The first suc conntel charger duced over ten years ago Type A. B., price > West of Rockies, $21 A acto batteries, ; “B’’ battery charging attachment, Write for literature and name of s+ who _ supply you with the genuine FF charger. FRANCE MFG. CO. 10424 Berea Road CLEVELAND, OF i": FFougr The Triple Duty Charger . es ee ye Hool Tor ceive easy Unit If yo now. form

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a eee ith a |} . J POPULAR MECHANICS ADVERTISING SECTION Your “Vacation Home?’’ Bossert “RADIO” Bungalow Biggest Value $615 Ever Offered in a Bungalow F. O. B. Brooklyn HE Bossert RADIO Model Bungalow is a new idea in vacation bungalows. Comfortable room arrangement is combined with compactness of design, and sturdiness of construction with ease of erection. Built at the largest lumber plant in the East. The RADIO Bungalow is fully portable. Two men can put it up in a day and a half. No skilled mechanics required. If you desire to change the location it may be taken down quickly and trans- ported easily, so that it is your summer home wher- ever you desire to be. The RADIO Bungalow has living room, 12x12 ft., with big double windows on side, and single window, 2 bedrooms, 9x9 ft., with 2 large windows on different sides to allow for complete circulation of air. Kitchen, 6x9 ft., with 1 window, and bath. Both front and back doors glass paneled. Here is an ideal way to spend your vacation. At the beach, in the mountains or country. You can always enjoy your bungalow. Its small cost is paid back the first summer in health and happiness. Decide right now to benefit from the eet of bun- galow values. Houses in stock ready for immediate shipment. Write at once for order form and folder completely describing the RADIO Bungalow. LOUIS BOSSERT & SONS, Inc. Largest Lumber Plant in the East 1371 Grand St., (House Dept.) BROOKLYN, N.Y. It’s easy to operate the new KIC-O “B” Multi-Power Unit Hook it up to any light socket and leave it. To recharge, throw panel switch up; to re- ceive, throw panel switch down. i Sn easy — efficient. This KIC-O Multi-power Unit is guaranteed against electrical and mechanical defects. If you want the best radio reception possible, buy a K now. If your dealer can't supply you, write us for full in- formation and complete price list. 269 Mata ELECTRIC CO., Inc. 2669 Main Street, BUFFALO, N. Y. Veope tes. SHAVING CREAM 9 oe Oe SESE, s,—“‘( “ .CT.ChCTCOUhTT TL. 145 Mistakes Corrected for you in a shaving cream Please accept a tube to try —feel the difference GENTLEMEN: When we started to make a shaving cream, we looked to see what most men complained about in theirs—then set out to correct the mistakes they pointed out. These mistakes were: Too scanty lather Too quick drying. Hairs lying down We overcame them one by one. And that changed the whole situation. Men by the millions flocked to Palmolive Shaving Cream. It gained top place almost immediately. # Its success became a business sensation. 60 years study back it You may agree that it’s the finest shaving cream men will ever know—or you may not. But in justice to us both, won't you mail the c »upon and find out? Slow action. Skin irritation 1 Multiplies itself in lather 250 times. 2 Softens the minute. 3 Maintains its creamy fullness 10 minutes on the face. Strong bubbles hold the hairs erect for cutting. Fine after-effects, due to palm and olive oil content. beard in one remarkable 4 results 5 To add the final touch to shaving luxury, we have created Palmolive After Shaving Talc—especially for men. xesn't show. Leaves the skin smooth and fresh, and gives that well-groomed look. Try the sample we are sending free with the tube of shaving cream. There are new delights here for every man who shaves. Please let us prove them to you. Clip coupon now THE PALMOLIVE COMPANY (Del. Corp.), Chicago, Ill. PALMOLIVE — = ae 10 SHAVES FREE and 2 can of Paimotive After Shaving Tale Simply insert your name and address and mail to Dept. B-1012, The Palmolive Company (Del. Corp.), 3702 Iron St., Chicago, Il. Residents of Wisconsin should address The Palm- olive Company (Wis. Corp.), Milwaukee, Wis.

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146 The LARGEST RADIO STORES in AMERICA Pee ean ® a vi ort” O other Radio Catalog includes such a complete assortment of the best and latest Knock - Down Kits, Parts and Accessories. You need this book-——Write for your FREE copy today! We Save You Money! Our business is to buy up manufacturers’ and government surplus stocks, jobber and dealer benbrest stocks but only brand-new, fully g lly advertised appa- ratus. = enormous buying power permits us to pay spot cash and get rock-bottom prices —even way below manufacturer's costs. That's why out catalog is crammed with thousands of wonderful Radio Bargains. multanot 509 So. State St., a _CHICAGO, ILL., , Dept. PM6 POPULAR MECHANICS ADVERZISING SECTION New Quick Detachable ROWBOAT MOTOR Get more fun out of your vacation this year. Take thethrillof motor boatingw ith you wherever you go. Elto attaches instantly (without tools) to any boat. This wonderful little 3 H. P. Motor is— FAST—POWERFUL EASY TO CARRY Weighs less than 171!bs. per H.P. Has these exclusive features — Propello Pump, Instant Easy Starting, an Ex- tra Horse Power, Much More Speed, Safe Rudder Steering, Fits Carrying Case without taking apart. Write for FREE Catalog See how easily you can own an Elto. See why it is the safest Motor for all the family —the fastest on the water, and the easiest tostart. Write today. ELTO OUTBOARD MOTOR CO. Manufacturers’ Home Bidg. Dept. AA ec, Wis. -The Motor that Starts with a Touch DEMONSTRATORS WANTED For 5-Tube Neutrodyne Set R ADI 0 04 Live young man in every town and neigh- borhood, to own, operate and take orders ae 7] pie % - Tour Your State} for the licensed, standardized, synehro- nized “De Luxe 5-Tube Coast-to-Coast Neutrodyne” made famousin *““The Radio Digest.’’¢ ast Neutrodyne’ retails only $34.49 at discc Thousands sold. Furnished you ount. Liberal financial arrangements. Write us at once all about HINK of it—you can now motor 1,000 miles for $3.33. New Indian Prince — the {Personal Motor —goes 90 to 100 miles on a gallon. Operates at 14c per mile. Light—Safe—Easy to handle. You learn to ride it in five min- utes. Costs less than any other first-class machine. Write today for illus- trated folder telling all about this Indian Prince—the Personal Motor—and how easily you can buy it. Sndian Holoete ( Ca, \_ Dept. P-6 Springfield, Mass. 7, ee a mm. a) 7) 7) ~ S | % ay x “— | yourself. Ask for plan. Also illustrated description of set. rst. orseeggl The Radio Shack 0... °725.°Ss Votes streets Mew Vor! City At Lower Prices CANOES ROWBOATS FISH BOATS HUNTING BOATS MOTOR BOATS OUTBOARD Outboard Motor Boats V-BOTTOM MOTOR BOATS oe. Two Factories Write to either one, Catalog Free~Save Money—Order by Mail State kind of Boat in which you are interested. THOMPSON BROS. BOAT MFG. CO. Ellis Ave. | 1223 cim st. Peution - Wis. Red-/ life-size x + and pie- Ste-she = ure fit sk ture instructions how you ~ vert your Ford into “into thle Fast, Sauc as thousands have done, wi' easily obtarie ors Car a8 No need to lay up the —, LOOK AT WILFRED ** Total cost with ateel and point for my Pal eni 814.31. It took me just 3 Dundass to build & ‘and ¥ sure am proud to hear them say, *He built that enappy sport car A —_, @ny woodwork before Kuempet patterns The “Pal with pressed «seta! streamiine rear, food “Pal. belia it. it. Over 7 11,000 cut “ , or did KUEMPEL co., vour FORD ‘3 SPORT CAR—SAVE550 to 5150 wirn REG-1-Kut sisSts $ oat Fa part, of 0 of the body co yeu tgo Conicat RS SSK .weses PATTERNS Order now while we can make Sea and a enjoy the wonderful spring days Classy. tron: is cutting ki ‘36. 59. On ne frame cw’ ih ordered with Pa ‘tine hind, “4 new mee of other distinctive == bod R “ can't with o Su (Ouortesd City) Oe. Loads, ae — _* Windehielde. 61 Easy-to-Understand instructions at Detivere oe gS You oon s. Send bc coin for er from $8.80 v onpEk Ire “Sify” Tope - > Rk RIGHT Now z | Bidg Sg. tows 38-inch Easy 5 | riding seat 2 Se am IRIN eT

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POPULAR MECHANICS ADVERTISING SECTION 147 $ 3 5 — livery Paid Seat of Miss. MECHANICS’ BENCH SAWS With this saw you can make your own repairs in shop, home, farm or garage. Makes a clean edge on the toughest wood—no planing nec essary. Rips, cross- cuts, bevels, miters, mortises, tenons, or grooves. Attach to any lamp socket Weight only 61 !bs. Will cut up to 144". Allmetal. Saw-size 6 in. Table 10x1: 3, base 7x11, height 7 in. Table tilts ice beveling 5 degrees left, 10 degrees right. Saw Table Can be » pure —~ $22.50 Motor This heavy duty motor can $12.90 with 6" saw for be furnished separately for , . Delivery paid Eastof Mississippi. $13.90 Delivery paid Delivery paid East of Mississippi. West of Mississippi. Comple te with Cord, P lug, and y are" flat or grooved Pulley. Guaranteed 50% Overload. $24.50 Delivery paid West of Mississippi. srt se Special Prices on Quantities of 10 or Over Write for Our Spring and Summer Catal PAUL J. DEVITT, 1101-1107 So. 2nd St., Phila., Pa. HARDWARE —_ OF PHILADELPHI - ’ FREE OUTFITS 3 | [24 Jewels! EER pote, jewels is good enough [0 AGEN [8= ‘a, = for the Burlington masterpiece. 25 more men can get, Free, Pont 6 Quality and Style i money-making Fire Gun' Adjusted to second—temperature isochronism — pomttens, 5 25 year . gs strata case, in 100 d ne. t- ) nsurpassed uality, rock on | Sales ¢ Jutfit—by acting quickly. This amazing new tom prices. 1 down brings | Fire Gun is bringing salesmen and spare time work- 5 your choice. Balance in small \ ers the biggest money of their lives. Clement made monthly sums. Gains Colin ee EE $113.40 one day. McPhail made $1,900.00 in four j ite or i months. Others are making $150 to $250 a week ) Send for FREE Book —- on Watch . | One demonstration often makes 10 sales—you profit : out about this big special offer made for a limi e $40 or more. Write quick for Free Territory and Burlington Watch Company Dept. A-135 | | Free Sample Outfit offer to - 19th Street and Marshall Boulevard Chicago, Illinois Weldon Manufacturing Co., Dept. 76, Grand Rapids, Mich. ; “Ligh i Lighting, Fixeures” in Your Home ' Our marvelous, practical Movie 1 (Direct from Manufacturer) Machines sell as low as $3.75 postpaid, Completely wired, including glassware. and use same size film as big theatres. We also Send for Catalogue No. 26. Just Off the i ress. have wonderful films at lowest prices—with a Special proposition to DEALERS. new film exchange service. Don't Miss This! ° Write NOW for Free Catalogue PPLY CO. . ag eee See ERIE, PA. | | PARAMOUNT MFG. COMPANY ...°-e* 7 } | ome 10 DAYS FREE TRIAL - MONEY BACK IF NOT SATISFIED AGENTS : neu, actual 4 H = ERE WANTED can ot, mes wth = : bear Bigger Profits More Sales No Investments Popular Prices No Collections assures mare — ~ = — No Competition > NC rite name and ad- INKOGRAPH CO., Inc. - = h glides Send for an inkograph | |_post umn $1.50 plus postage. 167-33 Center St. NewYork “Sue © tong a | _ and our salen plans emcee

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148 It is possible to make from $300 to $400 a month showing the Timberlake Oil Gauge and Dash Light to your friends and neighbors in your locality. Every Ford owner is a live prospect for this practical device. There is no guesswork with the Timberlake Oil Gauge and | Dash Light. It tells in a second the condition of your oil. We want representatives in every community with a Ford car to demonstrate and sell this utility device. It is easily and quickly installed by anyone. No special selling ability required. You can build up a big volume of business of your own. Become independent. Make your own income. Don’t wait. Be the first one in your territory to distribute this quick seller. Write at once for our proposition. Dept.— C. Model Aeroplanes Build your own lane; make trial flights snd Kare J ny ot Asree! of Aeronautics. ID Seale Seontane and Building and oi “Instructions help you build exact 3-ft. duplicates of any A the following well-known Planes. Send 25c now for com plete Pians for the one you want to build. De Havilland Battle Plane; Curtiss JN4D- 2 Training Plene; NC-4 Neve — “BOY'S” Airpiane Curtiss Military Tractor; clips together without nails, wire wt . Reng eo 7 or screws. Ready to fly in 2 hours. Peoti he new est idea Send 5 oc for cata- Arroplanes logue and find out about ft. Supplies, ‘be pectpat nEW YORK IDEAL AEROPLANE & SUPPLY CO., 408 West Broadway, corner Spring St., Build and Fly POPULAR MECHANICS ADVERTISING SECTION You've been looking for a ¢ hance to get out of the wage rut and be your own boss—a chance to get into something for yourself, to build a business of your own and an independent future. Here’s Your - . Big Opportunity wonderful ‘‘American Universal’’ Electrically Driven Floor surfacing Machine has opened a big new uncrowded fieid to men in cities, towns, villages everywhere to become Floor Surfacing Contractors Every new floor must be surfaced Every old floor represents a resurfacing job. The “American Uni- versal”’ whic h does work of six men and earns you six men’s pay, has made hand scraping obsolete Everybody wants “A.U.”’ Machine work. Demand S istremendous. Profitsenormous. Work pleasant, interesting: requires no experience Small amount starts you. Many making $150 to $300 weekly We he! p you, furnish advertis- ing, office forms, st: itionery, everything yu need. Get in now. W rite quick for free details The The American Floor Surfacing Machine Co. | —- §23 South St. Clair St., TOLEDO, OHIO Buy SPORT BODIES for FORDS at FACTORY PRICES! This Model 39. 50 in Grey Prime ) W rite for Circular B-1 Showing Other Models. Spert Body ee ARE Illinois A & H Auto and Furniture Cleaner (Not a Polish) Leaves a hard dry finish with less labor and better results than polish. WANTED Price $1.00 WANTED BATTERY EXCHANGE, INC., 2115 Olive St., ST. LOUIS, MO. Make Your Own MOVIES BABY STANDARD $3 7 MOVIE CAMERA For camp, vacation inciuding 2 Magazines Takes standard size pictures—25 foot reel and fun around home. Earn movey! making news pictures of parades, events, accidents, etc. Pictures can be projected on wall or sheet. $75 COMPLETE PRODUCING AND SHOWING OUTFIT Write for Free Folder telling all about this movie camera and outfit Distributors and Agents Wanted VICAM PHOTO APPLIANCE CORPORATION 1224 Beimeont Avenue PHILADELPHIA, PA. NEW VEST POCKET ADDING Tgp 95 Adds as rapidly and accura’ asa $300.00 machine, yet fits the vest Easy to operate. 9 column acity ow constructed oiling mod ne made. Counts Up to 999,999,999 Total visible at all times. A pull of the clears it. Don’t carry a pocket full of pencil stu paper and > 4 do your figuring. yt ot 10 Days’ Trial 5x ot tas ant ry & - we send machine t- — A, . on delivery $2.9. Use it 0 days A ae rove it does “ we —_ ‘Your money back if not perfectly sa jon f by cheap imitations. Order your Ve-Po-Ad now from this 6 Reliabie Adding Machine Corp., Dept.. 4 184 W. Washington St., Chicago, Wi. us Bove’ # @ money mabes__, Brave’ — i ane 14K Whit Chas Leve’ Writ

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ar Ne POPULAR MECHANICS ADVERTISING SECTION Scores of men mak- ng $5,000 a year and more. EVE YS in big demand in confec- tionery, drug, grocery, cigar stores, waiting rooms, newsstands, hotels, cafeterias, restaurants, poolrooms, barber shops, soft drink parlors, etc. WE GUARANTEE AGENTS 100% to 150% profit on $12 initial investment starts y- 4+ Evereadys (with sales-attracting bell attachment, 25c each extra). Complete investment averages from $100-$200, de- pending on number of EVEREADYS put out. Profits quickly pay back your in- vestment. Sell or lease EVEREADYS. then keep merchants supplied with stock (salted peanuts, candies, nut meats, etc.) ms | repeat orders Our contract with big nut- at specialty house enables you to buy all your (Patent eoalted fork eneglies wholesale—in separate bags or bulk. WHOLE OR PART TIME Volume business and big profits in short time. Steady business. Nothing else like EVEREADY —automatic—easy refill—no hooks, clips or stick- ers. Hurry—AC —for exclusive rights in your ccmmunity. THE INTERSTATE CO., 2387€E. Sth Pl., CLEVELAND, 0. (Refe renee; Midland Bank, C levelond) iveready’’ distributor has called—remit Dealers: \' $1.90. days must prove claims or return Sa Send For Our 1925 FREE BOOK OF BARGAINS Containing a full line of les and accessories at exceptionally low prices. from the e LYON TIRE SALES CO. Body Division Dept. P-33 1344 S. Michigan Ave., Chicago Self-Filler DE LUXE Stylo Pen “INDEPENDENT” All the best features of a Fountpen. Lasts longer Writes smoother. Improves handwriting liminates fatigue, GUARANTEED 14 Kt. White Gold Point, . Chased Rubber Holder. Lever Filler. Pocket Clip. Your Name in Gold Inlay, 25c. Write for Pen Catalog. Agents Wanted, J. C. Ulirich & Co., 161 Washington St., New York Known the World Over for 40 Years. y EW OS WATCHES-JEWELRY ye CO Da ie Be C—) eu © ee 7. & 4 This 45 year ok! concern ts the only credit house that operatesastrictlycash jewelry store. Our customers can buy on credit by mail at the cash store bargain prices. You save one third when you buy from us. Compare. '$2.00 down: $5.00 a month That's all you pay for this ladies’ 18 kt. solid gold ring sct with targe sized, perfectly cut, blue white diamond. Guarantced value $75 00. Will stand any test or comparison NO RED TAPE: NO DELAY You get quick delivery; best values; easi- est terms; money back guarantee; 8¢j, in- crease in exchange value. Dealings confiden- tial. 10 days free trial. Send a trial order. WRITE FOR FREE CATALOG It brings our jewelry store into your home. Hundreds of barwains. Compare prices. Satis- faction guaranteed . Send for your copy STERLING DIAMOND & WATCH COMPANY (Diamond Importers — $1,000,000 Stock — Established 1879) | 63 Park Row. Department 2943, New York. N. Y, 149 e EDICAL authorities agree that 65%, or nearly two- Mtiras. of all men past middle age, are afflicted with a disorder of the prostate gland. Here is the known cause for many of the ailments commonly ascribed to declining years —including aches in back, feet and legs, frequent nightly risings, sciatic pains, nervousness and lack of vitality. But now, science kn ows that thousands suffer needlessly. For a member of the American Association for the Advance- ment of Science hasdiscovered aremarkable new drugless hygiene that usually restores the prostate gland to its normal function- ing. Already it has been used by more than 5,000 men Doctors, Statesmen, Teachers, Bankers, Lawyers, men in every walk of life—with amazing resu “I know too plainly the effects of prostate gland disorder when it is allowed to continue unabated,”’ says the scientist mentioned above. “I know of the operations and the common saying among many that the ave rage life after this operation is only two or three years. Thatis why I am doing eve rything possible to let people know of this important discovery FREE BOOK If you have prostate trouble, suffer with any of the ailments mem- tioned above, you should not lose a day in finding out about this wonderful new method. If you will mail the coupon below you will get, in plain wrapper, a free copy of an interesting book describing this new method. facts every man should know. But edition of this book is limited; if you It contains send immediately, for the address SSCS SSSHSESESE SSSR ESSESTETE SE EES TESS ERS R Eee eee eee sees THE ELECTRO THERMAL COMPANY 2146 Main Street, Steubenville, Ohio Please send me Free, and without obligation, booklet, “Why Many Men Are Old at 40. wrapper. a copy of your Mail in plain Name Address City State. ...ccsccccceceecscses Western Office—Dept. 21-L, 711 Van Nuys Bidg., Los Angeles, Cal.

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ee 150 POPULAR MECHANICS ADVERTISING SECTION Popularity _ anion | The use of Kellogg transformers in your set will prove a delight in clear, powerful reception. Kelle radio frequency transformers are of the low loss, | high efficiency type. No “dope” to hold windings in place. | Minimum amount of insulating material. No. 603 for selective tuning. No. 602 when exceptional selectivity is not desired, Kellogg audio frequency transformers are built right for the kind of service you expect. They amplify the highest or low- est tones with absolute fidelity. Built in 3 and 4‘ to 1 ratios, Kellogg transformers are on sale at all radio dealers. Their use with Kellogg low loss condensers, will give you an idea! tuning and amplifying combination for your set, with results that will be most pleasing. Kellogg Switchboard & Supply Co. a weekto | Chicago, Hlinois operate Just Plugin Electric Light Socket pinceot ‘BR’ Batteries No tubes—no recharging— Lasts a Lifetime. Gives unlimited current supply from house light- ing Circuit and operates on A. C, or D.C. Current. ° - | nl | Every Electrical Lane Eliminator ot Eling, Wt Gives tone improvement and micrometer adjustment by a correct amount of plate voltage. Does not start discharg- ———— ing as soon as attached, but on the contrary, SEER Keeps Up 100% Voltage Constantly lt A tal) SOLDERALL METAL IN PASTE FORM Solderall for perfect reception Radion Panels—made especially for radio pur- nn te yg a ph pean gear pe ge poses. High insulating qualities and beautiful | fon in operation, and lasts as long as your set. Every appearance. Also dials, sockets, etc., etc. eliminator tested and sent out with full rnarantee. American Hard Rubber Co., New York City Comes in handsome $25 ORDER NOW! q indestructible case, Direct from Factory - . ° Lane Mfg. Co., Dept. 21, 2941 W. Lake St, Chicago | ) e Ms [09 YORU 0 0) — 5 TUBES—JUST ONE DIAL TO TUNE —_ GUARANTEED Here’s your opportunity to save $20 to $50 per set on 10,000 mile guaranteed Hold-Tite 10,000 MILES rires by purchasing direct from this factory at big fleet owners’ prices. No salesman's that tells the real truth about tires. Write today. HOLD-TITE TIRE & RUBBER CO., 775 na Ster ares SPRINGTIME — SPO ME — JOYTIME 9 mode! / 7 commissions; no dealer profits. You save the difference. Send for informative literature x age your bodies, $35 up. f t E S | EPS Poros sai Large Profits—Easy Sales en (ee yam Handling “VAPO” Vaporizers To Distributors and Agents selling the “*VAPO”’ Vaporizer—a unique, automatic, patented devict that gives greatly increased motor power, reduces gas con- | cumple Y, te 40% (guaranteed) and WILL remove carbon by a simple operation. Installed on any m - tor without expense in a few minutes—no holes to Build Fourcar NOW and empoy te | drill. Money back guarantee. Very attractiv thrills of motc during the delight “~ , R iT “i _ ful Spring and Summer months! Visit us today or send for free catalog. sales proposition. Write for details and sampk lfamzes. 2/2 om. Overhead vaives rice Price _ Now i 15.00 « Speed and Po Camshaft $16.00 $9.95 4é Ad . Big a, Sancta tte. SOL fy Mesure, sents uuan, glee tese | | WAPO” Specialty Company nia, Ps ce . . ac or oO : - > tn D.C. FORDSPEED BODY MFRS. 250 W. S4th Street, NEW YORK eo Direct at Factory Prices} _ This $2 KNIFE $1.18 Postpaid ' Hand Forged Razor Steel Bladest — : Handy shaped Blade makes this : — —== knife best for mechanics, sportsmen : -- = and farmers; light but strong; re- y sharpened easily. 8 handle. Ger- man silver finish; blades file tested, hand fo from razor steel and warranted. Sample $1.18 3 for $3.00 Postpaid Send for our 100-page List and “HOW TO USE A RAZOR" “ MAHER & GROSH CO., 106 A St., Toledo, Ohio Forged Razor Steel Blades, No. 57 |

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POPULAR MECHANICS ADVERTISING SECTION 151 The Ally of Invention--- ADIO---as every other scientific mechanical achievement --- Owes its present day utility and popularity to inventive genius and master tools. Files are the most versatile Select your files for uniform- of all tools. More kinds of ity, keenness of edge, bal- industries require them. anceor “feel” and rugged en- They serve a wider variety durance. Then your choice of needs. They save time will be those bearing the and money. There is no NICHOLSON crossed-file substitute for a good file. trade mark. NICHOLSON FILE CO. Providence, R.1!., U.S.A. NICHOLSON FILES --a File for Every Purpose Why Not Solve Your Saw!) AGENTS WANTED! You will like its sturdy mechanical! con- Salesmen—Distributors struction. It willsaw wood, fibre, bake- lite 1° and metal 4" thick. Sold todemonstrate and gell attachment that makes Fords also without motor. We carry a run on 94% air. Thermostat on exhaust automat- complete line of bench woodwork- ically turns down needle valve as engine warms, exactly as Ford Manual says do by band. ing machinery. For details write to DELTA SPECIALTY CO. BLANCKE THERMOSTATIC Automatic Carbureter Control Dept. 0, 858 Third St,, Milwaukee, Wis. —!> = en Makes Fords start easier winter or summer — saves Works fast. Slides in half gas and oif— cuts repair bills one-half— prevents and out quickly. Dur- carbon. Sells on sight to every Ford owner as easily as bly ad Fb giving him a $100.00 bill, because it saves $100.00 ably made of brass every few months. CADILLAC NOW USES AS STANDARD EQUIPMENT THER STATIC CARBURETER CONTROL UNDER BLANCKE LICENSE. in on pome Es Money selling this Get pian thats proven vice. ence no 'SINESS; and n t Te ‘OUR OWN BUSINESS, iekne 's trimmed boxwood. Takes accurate inside or poy = z oe ey 20 cents per lineal foot. Outside measureMeNtS 5 not at deaier’s, sent postpaid. MASTER RULE MFG. CO., 841-43 E. 136th St., New York ¥ Dealers and Agents: request attractive proposition Write for Free Circulars Now! A. C. BLANCKE & CO. 602 W. Lake St., Dept. 805H, CHICAGO Built for Service | 5G6O | THE SYPHER | MFG. CO. Here is the lathe value plus—more for the money than anybody ever built. Length over all, 30 inches. Between centers, 14 inches. Swing over bed, 734 inches, includes counter shaft. Bronze taper bearings. Weight 60 pounds. Absolutely accurate. A real job. Write today for circular. Dept. D Toledo, Ohio

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52 PUPULAR MECHANICS ADVERTISING SECTION mower direct from factory Walls, Trees, Shrubs ONTAMOWER Neater lawn, less work, saves hand trimming, Cuts «* as we short grass, ~~ weeds. en jet running reat for terraces. Oa pe poeta users. Strong guaranteed mechanically perfect. Costs less than ordinary heavy lawnmower. Send coupon. “h y Mp othe, sun | MFG ® ids, Mich- . wagers St. Grand an. ; a : ™ Wi an obligation ce _— = = WiMontaMowe | NAME———_ — 4 ADDRESS : Turn Y¥ our Spare Hours Into Real Money! Haven't you often wished for a spare-time way of making money? Of all the various ways there is none more a and enjoy- able than playing in a band or orchestra. Clip and Mail Coupon Get the. articulars of our Easy Payment Pian that tells how you can ree while you play. Tria We want you to try out a *“*KING’’ in your own home, with- out obligation and if you do not find the “*“KING’’ the very best instrument you ever played — return it. Trade-in Proposition. Turn in the instrument you now own as ay ayment on a new ““KING’’, atest catalogs show many new modelsand te why" “KINGS are the finest instruments to learn on and play on. State the instru- ment you are interested in and send coupon. TheH.N.WhiteCo.,Cleveland Manufacturers of “ KING”’ Band Instruments THE H. N. WHITE Co. 5211-64 Superior Avenue ~ . Cleveland, Ohio Gentlemer: Please send me free your latest catalog on (instrument) 5 Motors Ideal for home-made phonographs, experimental. purposes and combina- tion phonographeradio sets. We have 75 small motors which are greatly under-priced for quick clearance. You will never again equal this low price, when this lot is sold. They are universal motors, 110 volts, 60 cycle single phase, complete with turntable, cord and socket for immediate use. 1400 R. P. M Motor has 1" pulley with flange for 14" flat belt. Housed in highly polished, nickel- plated shell. Don’t lose out on this remarkable offer. Order your motor today. Tomorrow may be too late. DO IT NOW! Price, $10.00 f. 0. b. Steger, Illinois. Industrial Division Steger & Sons Piano Manufacturing Company Dept. 50, Steger Building CHICAGO, ILLINOIS Spee down! Balance in easy monthly payments. The 21 Jewel 64 Different Art Beauty Cases. 8 adjustments. Chain FREE! Buy direct—big savings. Bi debater FREE BOOK 72r'S.ck Kk Watch. ieterticcas si Studebaker Watch Co., Det m M22 South Bend, Indiana SHOW IT—and IT’S SOLD The Handy Knife Sharpener is th: fastest selling home necessity eve offered Everyone a prospect. Sells for $1.00, your profit 65c. Free deliveries. Guar anteed. rnadet Under: gains, « oney ia, [Er Betts, Rome on late a cr ines capertiy se re- manv by t pene “Young Process”’ .quar- anteed |i new for fiveyears. Shipped direct from our factory to you at big saving. ig iM vine ted catalog sent free and pan F i ion to bi Dee. rite tr rons todas

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POPULAR MECHANICS ADVERTISING SECTION 153 Taylor Lyi éé 199 t aZe 1 Ou. COMPASSES : Welcome news! Here’s Campers, Tourists, | | : Barbasol in my hand, Boy Scouts, Sailors, ihaahieinn tlhe, and I hold a straight ‘ “at 4 ’ ait shave, full satisfaction, + ia = aoa by and four of a kind. No mapasecs. y brush. Norub-in. No Experimentersand Radio after-smart. No trouble. ie oil fans for loop direction. Try Barbasol—3 times awe Made in many styles; bar- — according to direc- needle or floating dials, open | | tions. 35cand 65c tubes. or hunter case, non-luminous | . or luminous dials. Your rd dealer has them. ra Write for free booklet on rd The Taylor Compasses. Now! ” Suneest Taylor /nstrument Companies ar ~ ROCHESTER, N. Y., U.S. A. Please mail me CANADIAN PLANT, 110-112 CHURCH ST. & your Free Trial TYCOS BUILDING, TORONTO v Tube of Barbasol. Taylor Miradial THERE 1S A TYCOS OR TAYLOR TEMPERATURE P = No. 2916 INSTRUMENT FOR EVERY PURPOSE - ‘| | Bodies of Rare Beauty for Fords FF Mtleee....s+saneden me At Factory Prices! . and ‘ $22.7 Up Soe ae ate Write for Circular C-1 show- . P. M. 6-25 ~ b. DeLuxe Model and F M d S h “ SPORT BODY WORKS, AURORA, ILL. or moacern aving Er EARN A —SRINTING | AGENTS cotton s Do You »-PRID paper NG Youcan sell Premier Knife Sharpeners oOuttits $8.86 up, Rotary Jobber, $10, Card Cutters $3 to housewives, restaurants, stores, Save Money. Print for others, big profit. Easy with etc.*9 out of 10 will buy. Sells for

ae rules sent. rite for catalog presses, type, paper.cards 50c. Writetoday for attractive LARGE Sei eink, etc. THE PRESS CO., L-37, MERIDEN, CONN. offer. PREMIER

J " =a Dept. 29 Detroit, Mich. for you S a E R i DAN 2 i & 1 FREE Book of Newest Styles just out. Womens, men’s, children’s clothing om credit and at bargain Gives opportunity to full and part time workers to earn doubie money daily. An attractive biz line of work and dress shirts. + el:s to bankers and workingman with repeat orders. Write at once. SHERIDAN SHIRT CO., Dept. 400, 702 W. Roosevelt Rd., Chicago, Ill. Brings This Genuine DIAMOND NO RED TAPE—_NO DELAY

= oS - ‘ae mond is set in an 18 Karat white go'd cup; % Karat -4 = est designs at Lowest prices. size. Latest design, hand engraved mounting. j Afull year to pay on everyaing 10 DAYS’ FREE TRIAL Py. gz ou order trom our oO We take all chances—if you are not satisfied at the r 7 ILLION DOLLAR STOCK. end of ten days for any reason whatsoever. return the diamond ring to us and your deposit will be re- Address Dept, 1349. Est, 1895 . funded to you. Send only $2.00, and receive this gen- uine steel blue white diamond ring exactly as illus- trated; in a handsome gift box charges paid. A legal } DI AMOND guarantee bond as to quality and value accomvanies ° % WATCH CO each ring. Afterten days’ trial pay balance $6.46a month e r for twelve months. Price only $79.50. Pe! HK Maiden Lane -New York

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154 POPULAR MECHANICS ADVERTISING SECTION GT SO ant § iC BplJust across street /v VS.PAT.OFF) | At the right is a view of my drafting and specification offices where a large staff of experienced experts are in my constant employ. All drawings and specifications ‘ E are prepared under my per- ms = i sonal supervision. Take the first step | Today to protect your Ideas Delays are Dangerous, Action Counts 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 com- petent Registered Patent Attorney AT ONCE. Every vear thousands of applications for patents are filed in the U. S. Patent Office. Frequently two or more applications are made for the same or substantially the sam« 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. Prompt, careful, efficient service This large, experienced organization devotes its entire time and attention to patent and trademark 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 trade- mark owners located in every state in the Union. Clip this Coupon and Mail il

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POPULAR MECHANICS ADVERTISING SECTION 155 TENTS writefor theseFREE book Frama No Charge for Information | /Innustpy on How to Proceed— ) * The books shown here contain valuable infor- ecw OBRIEN mation relating to patent procedure that every i inventor should have. And with them I will LOGS 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 books, and the ‘*Record of Invention” form, together with detailed information on how to proceed and SS the costs involved. Do this NOW. No need to lose a minute’s time. The coupon will bring you complete infor- mation entirely without charge or obligation. Strict Secrecy Preserved All communications, sketches, drawings, etc., are held in strictest confidence in strong, steel, fireproof files, which are accessible only to authorized members of my staff. Feel free to write e me fully and frankly. Your case will have my personal at- > tention. It is probable that I can help you. Highest CLARENCE A. O'BRIEN references. But FIRST—clip the coupon and get my e Registered free books. Do THAT right now. ’’ Patent Attorney e€ 7092 Security Savings & Commercial Bank Building, * Washington, 9. C. Clarence A. O’Brien 7 Registered Patent Attorney & Please send me your free books, “How to Obtain a Pat- | Member of Supreme Court of the United gy 00", and “Tnvention and Indu States; Court of Appeals, District of Colum- = = @_ Invention” form, without any cost or bia; Supreme Court, District of Columbia; ,.@ °®ligation on my part. United States Court of Claims. e ’ Practice confined exclusively - MOREE. .csntds beaedbaeeuneentektrnses cues - to Patents, Trademarks 4 and Copyrights. * * | id seaeoe | ItNOW! 3 (Important: Write or Print name clearly) FESS.

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156 — 5 | Our Philadelphia Office Sule 714-45 Bidg. TN] We Regard a Satisfied Client as our best advertise- POPULAR MECHANICS ADVERTISING SECTION YNaa ee TRADE-MARKS COPYRIGHTS Have You An Idea? Our Offer: PRE YOUR FIRST STEP Before disclosing an invention the inventor should write for our blank form , “RECORD OF INVENTION” 7 This should be signed and witnessed and returned to us together with model or sketch and description of the invention for INSPECTION and INSTRUCTIONS No Charge for the Above Information 2 Our Four Books Mailed Free to Inventors Our Illustrated Guide BOOK HowtoObtainaPatent Contains full instructions regarding U.S. Patents. Z Our Methods, Terms, and 100 Mechanical Move- ments illustrated and described. Our Trade Mark Book Shows value and necessity of Trade Mark Protection. Information regarding Trade Marks and unfair com- petition in trade. Our Foreign Book We have Direct Agencies in Foreign Countries, 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. | ment, and furnish anyone, upon request, lists of clients in any state for whom we have secured patents. - Highest References—Prompt Attention — Reasonable Terms VICTOR J.EVANS & CO. PATENT ATTORNEYS Main Offices: 956 9th St., N. W., Washington, D. C. Opposite U. S. Patent Office

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POPULAR MECHANICS ADVERTISING SECTION PATENTS cone IMPORTANT Do not submit your invention to anyone before you furnish proof that the invention is patentable or application has been filed. INORDER TOHAVE YOUR CASE MADE SPECIAL TO AVOID DELAY YOU SHOULD TAKE THE PRECAU- TION OF HAVING YOUR CASE MADE SPECIAL IN OUR OFFICE to secure protection, save correspondence and secure early filing date in Patent Office. To secure special prepa- ration of your case send $25.00 on account with model, sketch and description. MAIN OFFICE, VICTOR J. EVANS & CO.—VICTOR BUILDING, WASHINGTON, D. C. All Communications and | CUR ORGANIZATION OFFERS Data Strictly Confidential. | PERSONAL SERVICE Interference and Infringe- By Experienced Patent ment Suits Prosecuted | Solicitors and Draftsmen [FREE Mez “J. EVANS & CO. | COUPON NEW inthe on canoe | SAN FRANCISCO OFFICES | Hobart Bidg. 1007 Woolworth Bldg. | PHILADELPHIA OFFICES 714-715 Liberty Bldg. PITTSBURGH OFFICES 514 Empire Bidg. MAIN OFFICES: 956 9th Street, N. W., WASHINGTON, D. C. | | \ Gentlemen: Please send me Free of Charge your books as described on preceding page. | te Te ALI RR Suite 1114 Tacoma Building - Qur Chicago Office acee g ERR wees Sas Guar Cee SEE BEnF San” Our San Francisco Office Suite 1010 Hobart Building — owe ~-

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158 POPULAR MECHANICS ADVERTISING SECTION PATENTS DESIGNS TRADE MARKS MUNN @& CO. PATENT ATTORNEYS Associated since 1846 with the Scientific American 672 WOOLWORTH BUILDING New York City 412 TOWER BUILDING Chicago, Ill. 220 VAN NUYS BUILDING Los Angeles, Cal. Books and Information on Patents and Trade Marks by Request. FOREIGN PATENTS 523 SCIENTIFIC AMERICAN BLDG. Washington, D. C. 365 HOBART BUILDING San Francisco, Cal. c2G~e Associates in All Foreign Countries. To the Man with an Idea I offer a comprehensive, experienced, efficient service for his prompt, legal geen and the development of is proposition. Send sketch, or model and descrip- tion, for advice as to cost, search a prior United States patents, r etc eliminary advice gladly fur- nished without charge. My experience and familiarity with various arts ge ag crag me to accurately advise clients as to probable patentability before they go to any expense. Booklet of valuable information and form for properly disclosing your idea free on request. Write today. Richard B. Owen, Patent Lawyer 9-303 Owen Building, Washington, D. C. 41-E Woolworth Bldg., New York City C. L. PARKER Patt =n . ‘Law ver MCGILL BLOG WASHINGTON, O.C. Patents, Trade Marks, Copyrights, Patent Litigation p= for Inventors, “ Protecting, Exploiting Selling Inventions,” sent free upon request. wttal 1, ahd Makes Trousers Hang Straight If Legs Bend In or Out. Self Adjustable. Free Booklet — Pisin Sealed Envelope The T. GARTER CO. ?*%f; 2X0" Londons who derive larg- est — and certain simple but vital Patents. Our Ww: o.c. facts before applying for \ book t-Sense gives those facts; free. Write LACEY & LACEY, $46 6 St., Washington, NC. Established 1869. Have You An Invention? If so the WORLD PROGRESS will show you how to PROTECT AND PROFIT FROM YOUR IDEAS Sample copy free. One year’s subscription $1.00. Send for free book, “WHAT TO INVENT” containing SUGGESTIONS TO INVENTORSas to Inven tions N . We invite manufacturers to address regarding inventions they want. WORLD pReensss pes. hen inc. o.c — MO) - - _ ‘ | O.& beet fat CP & eee FP Bell | a

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POPULAR MECHANICS ADVERTISING SECTION 159 Booklet Free Highest References Promptness Assured Best Results _ Send drawing or model for preliminary examination of Patent Office records. ALL BUSINESS GIVEN PROMPT AND PROPER ATTENTION Listed Patent Lawyer in the latest editions of the Rand-McNally Directory of Bank- ers and Attorneys, of Chicago, Ill.; The Baggott & Ryall Directory of Attor- neys, New York City; the United Lawyers’ List of Attorneys, published in Chicago, Ill.; The Lawyers and Bankers Quarterly, published by the Legal Directory Pub- lishing Company of St. Louis, Mo.; the American Lawyers Annual, Cleveland, Ohio. | 644 G Street, N. W., Opp. U. S. Pat Office. Nason tee’ WASHINGTON, D. C.

Models and Experimenting Let Us Design and Build Your Models Complete WOOD— METAL PATTERNS CASTINGS — MACHINE WORK Established 25 Years McDERMOTT PATTERN AND MODEL WORKS 231-233 West Grand Ave. CHICAGO, ILLINOIS +] ~ 6 — {| Inventor's Universal Educator | - 4 N 0 FO R > A | Tells how how obtain fect sell patents. Si ogee sts a ideas. TH | i) F 0 R M ee 10w to select your attorney and avoid patent i ee een are DON’T LOSE YOUR RIGHTS ALBERT E. DIETERICH, 621-A Ouray Bidg., Washington, D.C. TO PATENT PROTECTION Before disclosing your invention to anyone send for blank

Contains 900 mechanical movements; 50 perpetual motions.

= | HL

form “EVIDENCE OF CONCEPTION” to be signed and | witnessed. A sample form together with printed instruc- ining TH tions will show you just how to work up your evidence fice and establish the same beforeg@iling application for patent. ‘ER ¢ Send us sketch or model for advice and exact As registered patent attorneys we represent hundreds of cost of patent. Our book “Hew te Obtain a Patent”’ inventors all over the United States and Canada in the sent free. It tells how to apply for Patents, Trade advancement of inventions. Our schedule of fees will be . c Marks, Foreign Patents, Copyrights, etc.; gives infor- found reasonable. The form ‘Evidence of Conception,” ° mation on Patent Procedure: tells what every inventor sample. instructions relating to obtaining of patents and tion should know. Thousands of Inventors, who are our schedule of fees sent upon request. Ask for them—a | clients, are our reference. post card will do. . <' 0 CREE’ @ CHANELEE, BU Voors Gapetnes PATENTS ANOAZ7AIB ADE MARKS = aan : gives instructive information and candid advice. ANCASTER '& ALLWINE MONROE E. MILLER, PATENT LAWYER a ae 411-2 Ouray Building WASHINGTON, D. C,. Registered Patent Attorneys in U. S. and Canada. ELECTRICAL AND MECHANICAL EXPERT 480 Ouray Bidg., WASHINGTON, D. C. a . . Originators of forms “Evidence of Conception.” ——}] Buchstein’s Fibre Limb | is soothing to your stamp —strong. cool, neat, light. ymenta — “ rn Braces for all de — | The man who studies gets ahead. Popular Mechanics ) ©. BUCHSTEIN Press will advise you what books to read to advance in , 610 3rd Ave., So., quae MINK. | your trade. 200 East Ontario Street, Chicago, Hlinois. — —___—_- — ,

“| INVENTORS yd20%S.. .00. Send for our Guide Book, HOW TO GET A PATENT, and Evidence of Invention Blank, sent Free on request. Tells our terms, methods, etc. Send model or sketch and description of your inven- ven tion for INSPECTION and INSTRUC- su TIONS FREE. TERMS REASONABLE. BEST REFERENCES. ne. | RANDOLPH & CO. STREET hirtnniitiesplesidesintintiaitil beached 300 Victor Bldg., WASHINGTON, D.C. ciy STATE.

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160 POPULAR MECHANICS ADVERTISING SECTION Electric Welding Simplified } > sheets ‘ ry ; never miss them. See our ad page 1 127 in April Popular Mechanics. | burning—either sheets or battery terminals g Course of Instruction, Tools, Waterproof Cover, all free to you now. Send and many other uses. Particularly useful for today for New Special Offer and Bookletof valuable ty pewriter information, > E : . SMITH TYPEWRITER SALES CORP. 300-960. Grand Ave, Chicago | J Welding Cracked Water Jackets, Furnace Sec- — ee ee ee Gee ee ee ee ee ee ee ee ee ee ee ee ee tions, rf rank ( ases or Rear Ends without dis-

i Smith Typewriter Sales Corporation, Chicago mantling. Not good for thin sheet metal or Ship me the L. C. Smith Typewriter described in this advertisement F. 0. B > re | Chicago for ten days’ free tral I will deposit $3.00 wi th the express agent with | brs azing exe ept in spe C if al cases. ' pe understanding that he will refund it to me any time within ten days if I de- cide to return the typewriter to him. If I keep it [ will pay you $5.00 monthly } until the balance of $63.20 is paid, title to remain in you until paid. It is un- i Write for FREE Book § derstood that you give the standard guarantee, | Standard for 1 I | oan an iat eaiie dh. © Send tod: Ma for a ge and our f PND s cn ho pecesowrscséscveccccccccsessevovssdbocce a | Ce eee ae book, ARC” which contains i o> ‘walinee, gnaae OF ages ot arate ai welding ideas . I Street Address 1 frequency, or combina- “REE and no obligation of any kind. (| b FRCIGTOSS ccc cece eee eee e rere eee ee eee eee seeeeeeeseseses tion Geovest, 4 ‘ent censees under Pat 1305362, June 3,19 universa mode le ES EE A ESL DEIR BE 1 | | 220. 440. sso vols ac | THE ELECTRIC ARC CUTTING & | — WELDING COMPANY one unit MenaGS Bis ccc ccccecccccscccccecesesececccsess ccccccceoce 152 Jelliff Avenue NEWARK, N. /

U.S.ARMY KRAG CARBINES All Carbines have the new model $ 1898 stocks. The barrels, actions and parts are either new or have been refinished by the Government and equal to new...........

omen oda Krag Rifles....... $12.50 Krag Sporting Rifles = ge DP me ty the dan hg week he Spread. 45 Shot Gans, 46.59 Sprend. 0s er si6e. - AND OT d MS. ¢ tare tine, up to $16.00 0 Say fall tone ee Sane W. STOKES KIRK 1627-PM, North 10th Street Philadelphia, Po. tives are making that and more with our Plans. Simply introduce and take orders for famous World’ "9 Star Hosiery and Un- derwear sold direct from mil! to home—a com-

plete line for whole family. Permanent customers and ers make you steady, big income. vering or collecting. No capital required. Write Quick °° dollars. "Your profits bogia” at once. Exclusive ve territory. No experience needed. Write today and I’llsend all facts and tell how to start Free. (Established 29 years.) World's Star Knitting Co. 276 Lake Street Bay City, Mich. meosts a ye :48a week We want men and women as local representatives to demonstrate and take orders for Comer All-Weather Topcoats and Raincoats. New offer enables you to earn $48 a week and Dodge touring car. No experience necessary. Write quick. Comer Mfg. Co., Dept. W-5110, Dayton, O ELECTRIC Hh FIXTURE CATALOG! Ulus- Write today for your copy. Save 50% direct from Manufacturer. No Middleman’s Profit. OUR SPECIAL:8 Room Electric Set, ready to hang, $24.5 0 —Other bargains. UNITED —£- FIXTURE Co.

D Add class to your Ford withasnanpy,“‘sassy”’ speed body. Best body bargains on market. Write for fully illus- trated catalog show- different models and all Ford accessories

Linors 280 Bowery Dept.P New York 4 Make $25 t $100 Day 2 Pits, permanent. profitable, veer Ppa ay at ay @ ‘round business ~~ yourself manufactur son ing Chip-O-Taters. Deliciously different okiet from Saratoga Chips. Complete equipment and instructions furnished. Our equipment used by country largest Potato Chip manufacturers for twenty years. THl Compare our equipment, prices and terms SULLIVAN MACHINE co. with others. Write for money making ————T proposition—TODAY ! Pioneer Manufacturers of Potato Chip Machinery __Dep’t. 106 1157-59 Dorr St. TOLEDO, OHIO

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(CxS) a TLE sswrean 9 Lose Bey | ae | cr ta 9 - ® " “ y isfaction Cassantoed - or Money

WY Uy, GY rklin BI ite Diamo Y 2 With Diamonds: p Diamonds, $80; ven Dia- G\4 monds, $95; nin c Diamonds, $110; emrnended by Dia- monds, $225. Guaranteed to Pass In BAMILTOR No. 992, 21 Jewelia, to § in aie ted to.6 F LOFT! BROS.& CO. Fess THE = RELIABLE ORIGINAL CREDIT JEWELERS Dept. 08 N. State St., Chicago, Ill. \i, Send for Catalo set tay ee , Watches, Wrist Watches, esh Bags, Silverware, etc.

sign, beautifully engraved. Solid 18-k White = Gold, 17 Jewels, $35.00. De- 00 A vered on first payment i$] Week TERM « Goods de livered on first fe ayment of one-tenth of purchase price ; balance in equal ampunts Wiatots 17 Jewel Weseua RINGS Elgin No ““Blite’’ Wed- No. 15—Green ding 5 or Gold, 17-Jewel ‘arat White $750 Eigin Watch; 25- 4 he ar * all Piatinum, Case; 12 Size, Gilt res "Diamonds, $65; five Gown, ‘then High-grade Railroad Watches ILLINO Bik N sPEcraf.” 21 wiidegets. $50 Bigis's SLATEST PRAY MOND. 2 21. TT vewels: $55 nega” Adjustments, Runs 4 winding : Send for the Loftis Catalog

Cities

ustrations of Diamo:

tt prepaid for your FREE EXAMINATION SZ

Blue White Di Solid 18-k A “s a ny

WA

~~) Buy of LOFTIS, ; the Direct Im- @ porter. Select as many articles as you wish and have all charged in one account. Catalog explains everything.

We invite comparison of quality and prices All Goods Delivered on First Payment

ear Quality Z ial, $30; $37 apectton, epaated $55 ra" years

from 9 to 10. Loftis Bros. &

Radio Fans—Listen in on W. H.

T. Every Friday night Co.’s Hour of Music

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162 POPULAR MECHANICS ADVERTISING SECTION able excey. LUMINOU 8 PAIN?, rendering it postostiy visible in the dark. LIANT IT SHINES. Quite simple to use. Any of your wateh or clock wi tons or ewitch plates of your electric — our own Luminous Crucifizes, Luminous Oc and $1 postpaid. JOHN Serpent's Eggs Box contains 12 eggs lit with a mate) erad: a self into # foot tong, which eet mg, whic curle and twists about in & most Wife —— CIGARETTE tor 25e. stpan, 2 MAKER Roll your own and save money Makes them better and quicker besides saving more than half. Use your favorite brand of tobaceo. Neat, useful and handy. Pocket cise, weighs 4 os. Made entirely of metal, nickel-plated. Price 25¢ postpaid. MIDGET BIBLE GREAT CURIOSITY Sinallest bible inthe World Bise of a post- age stamp. 200 Pages. Said to bring genuine work of art. Must be seen to be appr selling them to rate tl »une good mvs triends, church acquaintances ete suns E 18¢ ench. 3 for 40c, 12 for $1.35, 100 for $7.50. Also obtainable in Leather Bindine, with cold edges, Price a i. 'S, $4.50 per doz. Ma 1 Midget Bible, 1Se. Withabunch of these bills, itis easy for each person of limited means to appear rosperous y tiashing a roll of these bills at the proper time and peeling off a genuine bill or two from the outside of the roll, the effect created will be found to be all that can be desired. postpaid: 49 Bills 20c, 125 for 50c, or $3.50 thousand postpaid. Wonderful X-Ray Tube A wonderfullittle instrument pro- ducing optical illusions both ¢ surprising and startling. Withit what is apparently the bones of owl inna lend pencil, the in @ pipe etem, and me us. A mystery that no one has been able to eitisfactorily explain. Pri 3 for23c, dose: 7T5c. Johnson Smith &Co. Quaint and Novel Design A VERY striking and uncommon ring. Silver finieh, skull and crossbone design, with two flashing gems eparkiing out of the y many to bring Good Luck to the wearer, hence its name, ood Look Ring. Very unique ring that you will take a pride in wearing. ¥Y 25 Ss. brilliant, Dept. 368 A DeLuxe Edition of our new Handso est tricks in ma interesting boo! elsewhere LUMINOUS PAINT Make Your Watches, Visible by Night = at an exorbitant price, we have at inst Boece Me in which, applied to the surface of any ts — DARKER THE nIGnr, THE MORE BRI enable you to tell ‘the time by night ights, match boxes, and SON SMITH & Co. Clocks, Etc., Le very latest discovery in the scientific Hitherto, practically unobtain- —— this —— article, em rays of white ti, “04 a little applied to the dial You can coat the push but- innumerable other —— Rosaries, etc. Smal! bottle, price 2 Dept 366, RACINE, wis. Exploding Cigarettes y= e@—you can do it. JUST LIKE ORDINARY CIGARETTES. BUT SUCH REAL STARTLERS! The box containg ten genuine cigarettes of excellent juality They appear so real. but when each cigarette leabous one-third an shed, the victim getea voz great surprise as it goes off with a loud BA A great mirth provoker yet entirely een Price 25¢ per box. Popular Watch Charms 1925 me cloth binding. Only ic, the newest novelties, puzzies, ga . curiosities in seeds and ~ e- [5c ONLY 3 for 40c; $1.35 doz Very, pretty little curiosities and decidedly novel. Fitted with Magnifying Lenses that enlarge the pictures to 4 very surprising degree; in fact, it aeeme almoat incredible that a clear picture could be possible in such a emall com. pase, and how eharp and diatinct they show up when you look through. Come in views—Actreases, views of Panama Lord's Prayer in type, etc. Mystic Skeleton A jointed ficure of a skeleton 14 in. in height, will dance to music and perform va- rious gyrations and movements while the oper- ator may be some distance from it. NEW BOOK ON ROPE SPLICING Useful Knots, Hitches, Splices, etc. A most practical! handbook iving complete and simple irections for making all the ’ moet useful knots, itches, s rigging. splices, ete. Over ¥ J 100 illustrations. All about assorted Canal, ete. F illus Knote great value to mechanics, riggers, campere, boatmen MAGIC FLUTE Wonderfully Sweet Toned and Musical The Magic Flute, or Numan- atone, is a unique and novel ' that is Price 20c ppd. Dp combined ie juet a little knack in playing t which, when once ac somewhat rrsembles a finte. There is no fingering, and once you have mastered it you can play al! kinds of music with facility and ease. When plaved as an accompaniment to & piano or anv other musical inetrument, \ the effect is as charming as it ie surprising. Address orders for all goods on this page to JOHNSON SMITH & CO. RACINE, WIS. CATALOG malied on receipt of 25c. book of its kind. 420 pages of all the tat- mes, sporting goods, | plants, etc., unprocurable quired after a little prac- Post ice will enable you to | Paid Produce veryeweet | BLANK CARTRIDGE PISTOL Protection against Burglara, Tramps & Dogs Price Well made and effective; modelled on latest type of Revolver; appearance alone is enough to ecare When loaded be as effective as Blank Cartridges obtainable fo og where. Price 3 00 postpaid. Blank Cartri: by express, Si ner 100. Holster (Cowboy type ies Biank Cartridge P stol, $O0c, postpaid Johnson Smith & Co., Dept. 368, BOYS! BOYS! THROW YOUR VOICE he t Into a trunk, under e\\" me the bed or any- ? where. Lots of fun fooling the teach- er, policeman or friends. THE VENTRILO a little instrument, fits in the mouth sight, used with above for Bird Calls, etc. Any- - sno can tite it. ever Ss. 32 page book on ven- WHloquism, the Ventrillo, ALL FOR 10CENTS y K Everything about the Ku Klux Klan to\ in a clear, fearless manner. Book tells a How it started and was oppressed in 187 —The New Ku Klux Klan—How Orgar ized—How Membe rs -+% Enrolled— Oat yee Klan— @ r Candidat Creed— Objects of the ¢ ordie — Ibedienc: Fidelity—Pledge of Loyalty—Mu Klux Kian and the Masons— The Jews— 1! M: sons—Real A, Cc Oath—The Negro Ku K Kian, etc. atest and most complete | on the Klan ct tisha Price 35c, Postpaid. Stam on dy deligh ted with it. Odd, curious and interesting. Lots 1 of pleasure as wellas very use ul, Itisadouble Microscope for examining the wonders of nature. It is also an Opera Glass, & a Burning Lens, a Reading Glass, a Telescope. @ Compass, a Pocket Mirror, and a Laryngascope—for examin ing eye, ear, nose and throat. even one painful cinder inthe eye. Folds flatand tite the et Something great — you need one. postpaid It is worth all the cost to locate pod Don't miss Only 35c or 3 for $1. 00 BABY TANK Goes back ward mail, y Runs ten times lone most mechanical toy* somely finished and | flaged in natural colors. 25¢ postpaic Male Sex Indicator Hold the MAGIC INDI CA over & man's inatantly it © ine, t j hand in a straight ward and forware it over a woman's ! and it de seeribes | “ plete an circle. The same action can be obtained over & letter written by + fi woman ete Tt ie fascinatin n¢; baffline have never been able om | out how it’s done—but we've never seen it fail. Many novel and onter ji ing feats may he performed with the Sez Indicator. For eras - ieke results can be obtained with animals, cate, dogs rabbits, over bir ib toda | canaries, ole. Aleo used (0 ) predetermine the sex of chickens ws for 85. DP in fact it is sold as a patented exe tester in Europe. Price 25¢e,or 3 for | JOHNSON SMITH & CO., Dept. 368, RACINE, wis. Prt cali reg Fo 9141

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‘oo “pe. a amin jocate pock $1.00 ANK ostpaic icatcr IC IND! . § . POPULAR MECHANICS ADVERTISING SECTION 163 $500 a Month or More "ROUBLE LION? with Foley Saw Filer and Setter J. R. Baker’s Sharpening Works, Ottawa, Can- ida, writes: “The Foley Saw Filer ieee’ Model F-5 is giving entire satisfac- ~ eee tion and I am now doing a great deal more perfect work with it.” Geo. W. Abbott & Son, Contrac- tors, Hughsonville, N. Y., say: ‘Foley Saw Tools are in constant use filing hand, band and circular saws; much better and quicker than filing by hand.” New kind of electric auto trouble tamp sticks to iron or steel—at any angle—under the hood—under the fender—on the wind- shield—leaving both hands free to work. Reaches any part of car. Throws clear beam of light 250 feet. A portable trouble lamp—a powerful spotlight—a convenient camp ok Out-performs trouble lampe costing $7.50 and up. Sells for $2.50— Prices and catalog on € | This Plug 4 Foley Saw | | Attaches To} YOur Profit $1.25 Tool Dash Light Rentvete are cleaning up. A pa sold 56 Stick-a-lites in one hour and 30 minutes- Company | 70.00 profit or almost $1.00 a minute. A school boy in Indiana sold 35 in one afternoon. Toffer sells 800 in one month. Dawes 914E.Lake St. makes $30 a day. Merrill sells 500 to 1000 a month. Clark has Minneapolis, | standing order for 1000 a month. Minn. | Stick-a-lite demonstrates on any car im one minute. Spectacular demonstration is amazing. 8 out of 10 motorists buy. You have 10,000,000 prospecta. Don’t waste any more time on high priced slow-sellers. $10,000 a year is waiting for you with the Jow-priced, . fast-selling Stick-a-lite. et Ga t - el t-Youth | Send $2.00 deposit for demonstrator and start right out making $10 to $30 a day—days or evenings. Your money refunded if de- monstrator is returned in;30 days. If you prefer, send no money——only name and address for details. Hurry for big touring season. PREMIER ELECTRIC CO. Dept 2-G 1800 Grace Street CHICAGO, ILL. | A HOME | = GYMNASIUM Many buman ills are of Spinal origin. This great Univer- sity invention. The Cropp Therapeutic Couch. Rejuvenates a the body—Stretches the Spine , Skeleton, Cartilages, Nerves Arteries, Muscles and Ligaments. Helps correct Curvaturee Deformities, remove causes of arrested growth, give Heigh ® and a Body Beautiful. Ask for free book. “The Human Body.” Sesteseat t h. Nest! Tube a : : . ertected after years of research, Nestler’s Tube Compoun 200 Wanticnel Health Devices Corporation . eliminates punctures, slow leaks, leaky valves—the cause of est 59th St. Dept. 18, New York City 99% of flat tires. No more changing tires; no more costly ee —————— delays; no more rim cutting, no more spoiled fun, when you have Nestler’s Tube Compound in your inner tubes. Fasy to use. Harmless to tube, vaive and tire. Money back guarantee on each can. Inexpensive; 85 cent can does one 5inch tire or two 3% Inch tires. Everyycar owner needs Nestler’s Tube Compound in all histires. Sent postpaid on receipt of price. Agents and dealers write for special proposttion, NESTLER RUBBER FUSING CO., Inc. Easily earned selling THE NEW SUN-O- RAIN gas-mask raincoat. It's the most attractive coat you've ever seen. $2.75 each, (Dozen lots). Sample sent upon receipt of $3.00—Agents wanted. Dept. 12 245 West 55th St. NEW YORK CITY GOODYEAR RUBBER MFG. CO. —_ Dept. E, 34 East Sth St., N. Y. #) Long-Eakins Go., 628 High St., Springfield, Ohio . J ___ Mail me at once your free catalog and full > particulars about how to make big ~ profits in the Crispette business. a GITS CO. 5419 W.Chic aqoAve CHICAGO.) SALESMEN—SEND FOR SPECIAL ADVERTISING OF SPLENDID PREMIUM. Profit $1,000 Month Easily Possible! at LITTLE ee ae Big Saw Values “ cost Bigger work, bigger volume can be easily handled with amazing and accuracy on the BOICE-CRANE HANDISAW Large tabletop 14” x 16” elevates for grooving; swings 8” saw; cuts 24” Stock ; Sedens? 4%” deep by 11/16 wide; attachments for sanding and grinding; driven by any \ to % bp. motor; attaches to light socket; sold with or without to pay motor. Write today for descriptive catalog of Bench Saws, Drills, Jointers, Band ice Saws and the Boice E-Z Pay Pian. the Bo . B. & J. E. BOICE, *oRi2's Warcest maxees OF Dept. P. M. 6-A, TOLEDO, OHIO

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164 POPULAR MECHANICS ADVERTISING SECTION ‘10° a Day Easily New Ford Invention Get Exclusive Rights Now on Greatest Ford Invention David Gunn of Louisiana sold 22 the first day! J. V. Goulding, Utah, made $159.60 in five days’ spare time. You also can double your income and build a big permanent business of your own. Exclusive territory con- tract assures you of commissions on all sales in your district. New copy- righted sales plan secures dealers’ co-operation. No capital needed —just write today for full information. Kirstin Fil'Gage FILLS FORD TANK—GAUGES GAS WITHOUT LIFTING CUSHION Combined filling device and gasoline gauge—put on any Ford in 10 minutes— fills tank without lifting cushion. It makes the underseat tank handier than rear tank. Gas gauge always in plain sight—luminous indicator read at night. Made and guaranteed by 12-year-old $300,000.00 Manufacturer. Sells for less than Clamps in regular tank opening— replaces ordinary screw cap. Fills tank— $5.00. Every Ford owner wants to fill his tank without lifting the cus! euaseo gas, —Fil-Gage sells on sight. Send card today. Learn how you can « w ou 0.00 « av ¢ as xe iv > sentative removing $10.00 a day and up as our exclusive representative. cushion. A. J. Kirstin Co., 601 First St., Escanaba, Mich. $ Brings you any make of ADDING MACHINE We offer all makes of adding machines at the lowest prices ever quoted, Every machine rebuilt in our own big factory by experts. Guaranteed like new in every way EASY TERMS—10 DAY TRIAL We give you 9 months to pay. No interest charge. You can try any machine E ; “J would not part with it for*10,000” So writes an enthusiastic, grateful cus- tomer. In like manner testify over 100,000 people who have worn it. The Natural days FREE. We even pay transportation. Investigate these bargains. Write t day for big FREE catalog. RELIABLE ADDING MACHINE CORPORATION - y race Dept. 116X 184 W. Washington St. Chicago, 1. ( Comfortable and Easyto Wear Overcomes Weakness and Organic Ailments of women and men. Develops erect, aceful figure, brings rest- ul relief, comfort, health ‘)\ Big Band Catalog Fa £ v Sent FREE — Anything you need for the pand —single instrument or complete gauipment. Used by Army ard Navy. nad for big catalog. liberally illustrated, fully de- na. gent interests yon." Bree tra Not Sold in Stores— Fasy payments.” Sold by loading Made to Measure—Makes work easy and walk- — >)! ans SaSeS Syenyeuene, ing a pleasure; replaces and supports misplaced in- LYON & HEALY ternal organs; reduces enlarged abdomen; straight- 60-78 Jackson Blvd ., Chicago ens and strengthens the back; corrects stooping shoulders; develops lungs, chest and bust; relieves WwW backache, curvatures, nervousness, ruptures, con- ( stipation. ForA Write tod: for illas- Get Well—Stay Well trrics ‘rockicc mens- — Every Deaf Person Knows That 1 | urement blank, etc., and read our very liberal proposition. | | I make myself hear, after being deaf for 25 years, BI HOWARD C. RASH, Pres., Natural Body Brace Co. | with my Artificial Ear Drums. I wear them day rf 223 Rash Buildi - « SALINA, KANSAS and night. They are perfectly comfortable. N CRN _ ng rs one sees them. They stop head-noises. Write 1° ae and I will tell you a true story, how I became deaf — and how I make you hear. Address GEO. P. WAY, Artificial Ear Drum Co. (Inc FORDS: 60 miles on one gation of GAS, 4 80 Hoffman Bidg., 2539 Woodward Ave., Detroit, Mic! It has been proven such mileage can be made, " AILRLOCK guarantees to increase gas mile- “BOW LEGS and KNOCK- i { KNEES” UNSIGHTLY age; also prevents radiator boiling in sun- mer or freezing in winter. Cools, Fuels, De- SEND FOR BOOKLET SHOWING PHOTOS OF MEN WITH AND WITHOUT THE PERFECT LEG FORMS carbonizes the Ford motor. Splendid territor y open AIRLOCK PRODUCTS, Box 7U3A f PERFECT SALES CO. y 4 2251 140 N. Mayfield Ave., Dept. S, Chicago, I. | E2zA3 #150 “$300 PROFIT Mowe: WITH ONE DAY Sixkaine If Own a big money-making business charging auto and radio batteries in one day. New improved method with HB One Day Battery Charger. No experience needed. One Day Giergiae endorsed by leading ttery manufacturers. Thousands of HB's in use. Just $35 cash puts an HB One Day Battery Charging outfitin your shop, com- plete, ready to operate. 30 days’ free trial on money-back guarantee. Long, easy terms on balance more than paid by your big monthly battery charging profits. HB users everywhere making big money—you can, too. Write teday for free bulletin. HOBART BROS. CO. Box M66 TROY, OHIO MORE HB sav BATTERY CHARGERS. Js.» ANY OTHER MAKE} a

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POPULAR MECHANICS ADVERTISING SECTION 165 Screws to Beauti? Any Wall rank? | Solid Metal Phone Held truction Securely Handy Memo Recei os eceiver STOP now. Rush post card or Elbow zon / letter for this new deluxe book. /} Tells all about the new, wonderful i ed — ah Tater-Flakes business. Gives com- angs mee plete details of amazing Tater- — kes machine. og Shows how you and a this machine may go into partnership and $1000.00 monthly. It’s a clean, honorable fascinating business. You make and sell Tater-Flakes—the new vy Foe —— Removable Dont a stand for your tele porte Hold-a-Phon Holds It Securely —Releases It Instantly—Takes Up No Needed Room. average and better potato chip. More than 200 stores now operating. additional stores eeded. Send for book. ‘You | e rear This machine slices, drops, cooks, Hold-a-Phon offers an instant solu- factory RIAL go, m : d 4 proms en i “d ble. No Vrite 1 ume deaf o. (Inc. eit, Mich. \ 4 | \ curls, crisps and browns potato chips _automati- cally. No previous experience needed. Bright boy or girl may operate. Big Kos money in retaijing Rush letter or post card § and wholesaling. for deluxe book to i $2.00 worth raw potatoes makes $25. worth Tater- Flakes. Chicago, lil ULTRADYNE Famous Superheterodyne Write for interesting booklet on the famous Ultradyne. Phenix Radio Corp. 114-E East 25th St., New York City FISH WILL BITE i INDIAN | FISH LURE Goernn ee es 25e a box. Free catalog of ea and sed apelin, also Dough Bai’ SUPPLY CO. Dept. D. Miles on 1 G Ssllon| 2 Wonderful Vapor Humidifier For All Make Autos. Spare or full time Agencies Wanted Everywhere 1 FREE TO INTRODUCE BIG PROFITS to any MAN WITH CAR CRITCHLOW, Inventor, J-111, WHEATON, ILLINOIS O will make REAL MONEY selling Boys’ Suits at $6.85. Big commission. The only proposition of its kind in the country. No com- petition. Also Men’s Suits at $12.5 Selling outfit FREE. Write at once. **JIM’? FOSTER 2250 S. Spaulding Ave. CHICAGO, ILL. Sect Wonder Teleseee. 0 ostium a \ bey Brass bouud Powertul lenses See people and objects miles away as if they were close Moon and stars as never before. Useful and entertaining. “Could tell co ~ of Read numbers on \ freight cars mile away. —A. C. Paliner “Saw a light- house 18 miles away.”"—Clyde Serib- “Il could not eet. another I would not take $ $10 for it,"—A. R. Watker. “Can see across the Mississippi 3 miles an - see people fish- . L. Thorne. Thousands pleased On arrival of Bie 3 it. Wonder Tele scope with FREE Case and Strap, de- master only $1.85 plus few pennies postage. Satisfaction guaranteed or —= returned. Order today FERRY & Co., Dept. A-177, 6224 N. Lisleted St., Chicago seated--hut strument cannot be Protect the littl ainst this aby cannot Fee, vou can re- the “phone Senendingveds Hold- a-Phon and enjoy a conversation while the wmn- out from gers d low or fall out. tion tothe vexing problem of where to put the telephone. Its cost is a frac- tion of the price of a telephone stand, and it is free from the objectionable features of such a stand—takes up no floor space, holds the phone securely and endsthe danger of a child pulling the phone down and risking injury. At the same time, Hold-a-Phon is a strikingly handsome fixture, beauti- fully finished, solidly made, and offers a great number of important advan- tages. It fastens quickly and tightly to any plaster or wood wall and can be placed in any convenient corner, or behind a door. The phone directory attaches to it. A handy memo pad is provided. It has an elbow rest, which also takes the receiver when you want to “hold the wire.” Special Introductory Price HOLD-A-PHON SEND ONLY s (postage extra) ~w Positive Money Back Guarantee for only y *y* ~the special introductory price- ean enjy; e tremendous convenience provided b: Hold-a- Phon, Fill out the coupon bek 4 and mail % to us with $4.00. The postman will collect shes —s tage charge when he delivers your Hold-a-Phon. Then attach the Hoild-a-Phon to the wall — we are provided) and in justa few moments you will have solved for all time the troublesome question of the right pic e for the telephone. ane longer you use your Hold-a-Phon the better aU like it- any ft su are not completely satisfi sehr the Hold- hon any time within ten days and your money will be immediately refunded. Order your Hold-a- Phon TODAY and take gaventere of this special you introductory offer, Hold-a-Phon is easily worth more, as you will R “wt ven you see it. The coupon is just below, Sign and mail it, with $3.00 enclosec THE HOLD-A-PHON SYNDICATE 17191 Swift Ave. Detroit, Mich. Mail this Coupon Name ---- City --- The Hold-a-Phon econ, Mat b. P.M, 191 Swift Ave roi ic! is Enclosed is $4.00 for which please send me by Parcel Post, postage collect, one Hold-a-Phon, at your Special Introduc pore Price It is clearly understood that am at liberty to return the Hold-a-Phon at any time within 10 days if I am not th« roughly satisfied with it and that you will immediately refund my money. Street Address--------------------------- ---State-------—--------------

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166 POPULAR MECHANICS 500 fi ench

While ¢ they at These are all we have left of a lot of genuine imported Champiere field glasses bought when the French rate of exchange was lowest. “Champiere’’ always guar- antees optical and mechanical perfection. See cistant object as though they were near you. Won- derful at prize fights, ball games, boat races, horse races, aboard ship, on hikes anc auto trips. An ideal gift. This splendid glass has 8 lenses, of finest optical glass, over 1% inches in diameter. Wonderful light rPeass power and sharp definition. Middle bar graduated from to 12 for quick reference. Only Galilean Glass with 8 Lenses Selling Under $30.00 Only 4% inches high closed, 6'; inches extended. Great range. A good compass is attached to top bar. Tubes engraved. “High Power Aviator’s Glass,"’ or “‘Army Long Range Each instru- ment equipped with neck-strap loops and supplied with handsome case and straps. A wonderful bargain. Only 500 more at $7.95. Order direct from this ad. Money back if not satisfied. FREE Catalog of Over 200 Glasses The world’s finest binoculars, 3 to 24 power. Sport, observation, target shooting, etc. Write to America’s Leading Binocular House DU MAURIER CO., Dept. 206, Elmira, N. Y. Telescopes for

Here’s an Amazing New Way to Make Big Money in Your Spare Time! McDonald made $58 in one week! Hamp-

and women aan . time or full time. Remarkable sa: mele quite hoy ‘or Free Book and Special Agents’ U.S. Leather Goods Co. See. A177. 964 Wont Monroe Street, Chicago

ats SOAP a Removes dirt and grease perfectly with water. Leaves hands delightfully clea! softand dry. Absolutely pure and neutral — as harmless as cold cream. HUNDREDS OF SATISFIED USERS EVERYWHERE Send 20¢ in stamps for half pound sample in con- venient tin. Libera! terms to agents and dealers. Parke Corporation, Dept.K, Kalamazoo, Mich.

ONE DAY 2ai2cnc PAYS BIG Universal demand for brings a complete HB One Writeforfree bulletin. HOBART BROS. CO.

TERE $150 * $300 Froriss Start your own battery charging business that will pay $150 to $30u clear monthly profits. No experience needed. qe charging of auto and radio bat- teries. You can have these big, easy profits. Only $35 cash ready te use. Your monthly profits easily carry the small monthly pay ments. 30 days’ free trialon money-back guar- antee. The best and lowest-priced complete outfit on the market. MAKE YOURS 35 SHOP WITH HB 82724 CHARGING

ay Battery Charging Outfit

Box M6 TROY, OHIO

ind Om wee mM | _—

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’ 3 e r ?

POPULAR MECHANICS ADVERTISING SECTION 1¢

Here’s Your Own 6 Foot Steel Pocket Tape with your own initials stamped on it In extra fine nickel plated case; spring wind, cen- ter stop. Tape %4" wide; 6 ft. long; clearly marked. For architects, draftsmen, mechanics, business men, and for many household uses. Send your initials with order, and tape will be sent C. O. D. YOU PAY THE POSTMAN $1 12 which includes postal fee, — Returnable for full refund éf not satisfied. ™ wene Product AMERICAN RULE MFG. CO. 486 Johnson Ave., Brooklyn, N.Y.

ZIP!! —and the glass is cut clean and sharp. No flaking or breaking of elass. You simply draw the tool lightly across the pane, and you have a clean, con- tinuous cut supe- tior to a diamond cutter. **Red Devil’”’ Glass Cutters —It’s all in the wheel. Each one hand honed and tested. No 024-20c each at all deal- ers. Tool Booklet Free. ~ SMITH & HEMENWAY CO., INC., MFRS.OF CRED 260 Broadway NEW YORK, N. Y. THE TEN, GASOLINE : - WOTE N, ENGINE Aircooled and Watercooled. Nearly One-Half

H. P. in five pounds. Handiest little engine ever made. Ideal wherever power is needed. Complete line of small gasoline and steam engines, dynamos, motors, batteries, battery char- gers, etc. CATALOGUE FREE. DYNAMIC MANUFACTURING CO. First Nat’! Bank Bidg., Dept. 6 Chicago Makes Autos Go 49 Miles On Gallon of Gasoline An amazing new device has been perfected by James A. May, of 805-H Lacotah Bldg., Sioux Falls, So. Dakota, that cuts

down gas consumption, removes all carbon, prevents spark- plug trouble and overheating. Many cars have made over 49 miles on a gallon. Any one can install it in five minutes. Mr May wants agents and is offering to send one free to one auto owner in each locality. Write him today.

Be indeperdent. Make and sell this new candy novelty. Goes like hot cakes. Everybody wants it. Big Quick Profits. Many make $100 a day. (Letters prove this. Our files are full of amazing testimonials.) Nothing like it. Sells everywhere. Small investment. No help needed. Work dignified, easy and clean. Get all the information. Send name and address to = as A. T. DIETZ Mie lesse Toledo, Ohio 445 Sayso Bidg.

A Profitable Business of Your Own §f | THE RIGHT BIT FOR EVERY JOB ALL IN A HANDY KI pT Genuine Irwin Auger Bits in sets are time and money savers for the man who uses tools, Time is saved by having just the right bit for every job. Further time is saved because every Irwin Bit cuts swift and true through hard, soft or knotty wood. It’s a bit that holds an edge. Irwin Bit sets are packed in Borcase or Borkit. Either container protects your set so that it will serve you for life. That’s where you save money. There is a set of bits for every use. Ask your hardware dealer to show you. Irwin Home Set, 6 bits $3.50 Irwin Handy Set, 10 bits $5.50 Irwin Carpenter Set, 13 bits $7.25 The Irwin Auger Bit Company Wilmington, Ohio Hardware dealers everywhere sell gen- uine Irwin Auger Bits. The Irwin mark shown below is stamped on the shank of every Genuine Irwin Bit. ——<—— ThelRWINBit REG. U.S. PAT. OFF.

Please Mention Popular Mechanics

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68 | €ROST RADIO Parts of Quality Selected by Popular Mechanics for Their Circuit PAN-TAB JACKS The newest and finest jacks made. For panel- hung or regular mounting. All types: 70c to $1.00 list. Gang No. 619 BAKELITE Shock Absorber catia cil $3.25 Socket... a No. 251 Loop Aerial Plug only. "S¢ No. 250 Loop Aerial FREE! Jack ES: |: LU 48-Page Catalog of all our Apparatus How would you like to have a copy of our free 48-page catalog of all Frost-Radio Products? Shows our complete lines of Frost Fones, Musette Loud Speakers, Plugs, Jacks, Sockets, MEnmMoER \" Rheostats, Potentiometers, and HERBERT H. FROST, Inc. scores of other products. Write us today for your copy. Ad- dress Dept. 14F436. 314 W. Superior Street CHICAGO NEW YORK CITY CLEVELAND KANSAS CITY LOS ANGELES Export Office: 314 W. Superior Street, Chicago Please Mention Popular Mechanics POPULAR MECHANICS ADVERTISING SECTION Cabinet Shop Special No. 7 $250 as illustrated " with motor Pf, ~ The Most Popular Machine Parks Ever Built! A winner from the start. A real machine, yet convenient size for the small shop. Does everything in woodworking. Has circular rip and cut-off saw, 6 inch jointer, 16 inch bandsaw. Lathe and shaper attached if desired at small cost. Operates from any light socket Just plug in and go to work! Write for interesting circular The Parks Ball Bearing Machine Co. 1500-1540 Knowlton Street, Cincinnati, Ohio Canadian Factory: 200 Notre Dame East, Montreal, Can. p i" Thiaeae ‘woop t ligatio uy talog + / bargains. * Set . Halsted, Dept. A977, Chicago,u = «= Summer colds, bronchitis, influenza, whooping cough and other dar gerous respiratory infections yield quickly to Chlorine Gas. 1 T vents as well as cures. The Chlorinator—just out—ts the new ar successful home or individual mac‘ ine to give Chlorine Gas. / proved by Chemica! Warfare Service of U. S. Army. Some op territory for silesmen. Wr te today HUBERT MYERS LABORATORIES, 179 Erie St, Toledo, O. I Want 150 Good Men Our Representatives introduce our products with a first sale f beautiful Combination Sets of Toilet Art cles, Soaps, etc., at! + store prices. Our leader—Nifty Nine—a $4.00 assortment for -¢ with $1.10 profit for you. No fancy talk—they sell on sight. ¢ 30 sales a day. Easy to Average $100° a Week Could you ask more while introducing line establishing a permanent business y sweat Another plan calis for no investment, no deliveries—no delays: Bos ,ocket immediate profits. Iso a winning plan, with a premium to en rite TODAY for our illustrated circular explaining our unique Sales Plans E. M. DAVIS COMPANY, Dept. 5614, CHICAGO

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POPULAR MECHANICS ADVERTISING SECTION 169 Any Lathe You Want Why not own a Lathe of your own? We make it easy for you to obtain one of our new, latest model South Bend Lathes, embodying 32 major improvements made within the last 2 years. You can order any Lathe shown in our catalog on terms so easy you wont feel the cost at all. In this way the Lathe earns its own cost while you are paying for it. By having your own Lathe you can— —Save money you now pay others for lathe work, : 1 inch Swing over Bed, 3 an : Bed, Quick Change Gear. P Le $284 Make money on job work, Easy Payments if Desired. —Get your work done when you want it, —Do better work just as you want it, —Prevent information of your plans getting into outside hands, —Become a skilled operator, always capable of earning good wages in any shop. SOUTH BEND LATHES are accurate, and preferred by operators. Already 32,000 are in use in the United States and in 64 Foreign Countries. They are used by 5 largest Railroads, 8 largest Auto Factories, 2 largest Steel Plants, largest Radio Com- pany—in fact wherever quantity production of quality work is demanded. New Catalog FREE! Our new catalog (just out) shows 96 styles and sizes, from smallest Bench Lathe to largest Factory Lathe. Select the one you need. Our prices are surprisingly low, and convenient payment terms may be arranged. SOUTH BEND LATHE WORKS 801 E. Madison Street South Bend, Ind. 13 inch Swing over Bed, 5 ft. Bed, Quick Change Gear. Price $354 Easy Payments if Desired. 9 inch Swing over Bed, 2% Bed, Price “ $207 Lasy Payments if Desired. BSS SSSSSSERBREEER EEE REESE EERE BEBE eee g SOUTH BEND LATHE WORKS, 801 E. Madison St., SOUTH BEND, IND. @ Gentlemen: I would like your factory prices and terms on a Screw 8 Cutting Lathe, Size — Kind of work @ Please send Free Catalog. o @ Name s 18 inch Swing over Bed, 8 ft. @ Address Bed, Quick Change Gear. Price $653 a Easy Payments if Desired. @ City........ - ienitnesalianls State

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170 POPULAR MECHANICS ADVERTISING SECTION Quick, pat ptt § with you ri) Pe | Razor Blades . »» Here is aclever new stropper that enables you to strop your Safety Razor Blades just like the barber strops his razor blades — the natural “stropping” stroke. Simple, — easy to use, ‘ood for a lifetime. Puts a “Head Barber” edge on ANY BLADE—ANY MAKE . The TOMPSON STROPPER ... Cuts down your razor blade bill. Quickly pays for itself; shortens shaving time. Gives our blades a keen shaving edge er than new. Makes shaving a mere incident in the day’s life. Enables you to use the same blade over and over again for weeks. Neatly made da nickel steel. No mechanism. 65,000 already sold. TEN DAYS TRIAL Send $1.00 for the stropper complete. Try it out. If you are not delighted with the keen, new shaving edge it gives your razor bi the smooth velvet shave that follows, return the stropper to us within ten days and get your money back at once. Order today. Just pin dollar bill to sheet of paper with your name and address and mail. TOMPSON SALES CO. Dept. M, 739 So. Hope St., Los Angeles, Calif. GENTS-"102%22bay 0

territories are now being allotted, so if you want to last, easy seller (it's going like wild , get a post card off to us right now ends we will send you full pO Be the firstin our territory to secure this valua- _ ozcizeive. money-making agency. any of our agents are making from | 338 35 a day. Hurry your name for particulars before it is too late. AD S thenutecte uring Co., Dept. 100, 215 W. 40th St.. Mew York, N. Y.

a Truss! Now you can throw away forever steel bands, chafing leg straps and other heavy makeshift devices. For a well known American Scientist has founda new easy way to support rupture assisted by means of a wonderful little invention weighing less than 1/25 of an ounce. Not only do you do away with the objectional pressure and ti pe cweaeees. but you eliminate the “coming down” of rupture— when running, straining, exercising, encceing, etc.—which too fre- quently leads to strangulation. So great has been the success of this wonderful device that it is being offered to ruptured people on an absolute guarantee of instant satisfaction or no cost. Simply drop NOW—a world £fa- mous Rem- ington on DAYS FREE TRIAL cee CeCe eoeeeve tienda nn on oe yj ROL LP OD am a

Write today for details of how you can now get a world famous rebuilt Remington by our new Free Trial and Easy-to-Pay Plan. It looks and writes like new. Our 45-year reputation and guarantee are your protec- tion.Here is a real bargain—don’t miss it. American Waitinc Macuine Co. Dept. 601, Newark, N. J.

& postcard or letter requesting free literature to NEW SCIENCE INSTITUTE, 2113 Clay Street, Steubenville, Ohio

* Wonder WOOD FOR MODEL MAKERS! Imagine a wood that is % lighter than cork yet does not split, cuts easily, joins readily, can be sawed, planed, sandpapered and painted. Broadfield Model Wood has all these features and more. It is ideal for making models or patterns such as boats, aeroplanes, radio parts, boxes, etc., etc. Now availablein convenient sizes at low prices. Send 10c for generous sample and price sheet. BROADFIELD MODEL BUILDERS Box 32 : 3 : HEMPSTEAD, N. Y.

| iSaws15CordsaDay! —Easy with the OTTAWA Log Saw! Wood row for $3 acord brings owner $45 a day. Use 4.F. Engine for other work. Lg oo — to move. Saws faster than 10 men. Shi from f ornearest of 10Branch houses. for FREE **Wood Ce ee eh OTTAWA MANUFACTURING co. ‘1741-7 Wood Street Ottawa, Kansas Room 1741-T Magee Bidg., Pittsburgh, Pa. $2590020 A WEEK! Made with the new and improved “‘Krispy” Potato Chip Outfit. Potato Chips the lunch of the hour. Everybody is eating them. One stand in small building sells $100 worth in a week Think of it! Grocers, druggists, pool rooms, cigar sta Soutete counters, parks —al! sell thousands of packages. Su pi P them. Get the big profits. Chips easily, quickly made at ! mn | No experience necessary. Write today. Getina big pro fit fast growing busines SERVICE & EQUIPMENT CO., 905 Hoag St., Toledo, Ohio

Bievele you select, Styles, colors Cg Factory to Rider 2—*? Saves 610 to 825 on the R mene oa) pave o zeae choles pak. roval, express p for 30 poave’t FREE. TRIAL. Bicycles, $21. ‘3b up up. $a desired. and use at once

fin sa = =—« se =< If pe se) an th: sel yo fill ma Int

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—5! POPULAR MECHANICS ADVERTISING SECTION 171 Here Is the Man We Want ow If You Fit Into This Picture Send the Coupon Now He likes to earn big money; his greatest delight is to see the reward of his labors manifest itself in dollars and cents: he is a hard worker and is striving to become financially independent as quickly as possible. He knows that the biggest money is in the selling game — he also knows that sales success can be attained only by selling merchandise that repeats. He knows there is a vast, limit'ess market for high-grade tires and is smart enough to know that if he can offer a better tire at a price no higher than the others, he ean quickly est7blish himsélf in a business whieh will not only prove profitable from the very beginning, but one where his income will pyramid month after month and year after year—to a point of financial independence This Large Old Time Company Offers You *2,500 to 10,000 a Year ==: *::' A Sieady, Always-Increasing Income Our tires are sold everywhere, but we want to sell more of them. To increase our sales, we have adopted a new plan—a plan which puts you on an entirely different basis than any sales representative has ever been put before. This plan assures you a steady, always increasing income of $2,500.00 to $10,000.00 a year all depending upon you. If you want to give all of your time toour proposition you can surely make up to $10,000.0) a year. If only spare time, you can easily make up to $4,000.00 a year Bear Cat— The World’s Greatest Tire and We Can Prove It The Simplex line of tires 's unequalled today. Everyone of the three brands of tires we manufacture stand alone in superiority—in appear- ance, in performance and in value Hundreds of thousands in use inevery part of the world. It isan absolute fact that one of the Most Popular Tires in Chicago today is our Bear Cat Cord. Never in the history of automobiles have tires gained such popularity in the great competitive STANDARD Tires Wrerever You Go Everywhere, you see market of Chicago as Simplex-made tires lex-made Tires have There is a reason for this great end thems popularity. It will pay you to investigate! 9m thousand one set fs Meee 1-made t _ never buys anything else, SEND TODAY for Our STEADY INCOME PROPOSITION a Sees If you are the man who wants t» renresent ZEXTRA PLIES Clip the Coupon Now! an old time tire company financially i.11e- and It Costs No More ee ee a pendent and est:blished; if you want t» Simplex Tire & Rubber Co. sell the kind of goods that enable you t> 2035 &. Michiges Aven Dept. 5, Chicago ile ‘ : ce? atest Send me fu'l particu'ars of your proposi- go back to your customers for orders again tion which will assure me a steady, always and again; if you want to sell tires s> good increasing income, also a copy of your that you will automatically build for 7 »1°- book, “The Paved Koad to Independence.” self a business no one can take away from you; if you want to have a steadily increasing income of from $2,500.00 to $10 000.00 a year, fill out and send the coupon at once. To make certain of your home territory get it ‘ into the mail today. Doit now! At once! 4 moat enlightening b Paved Road to in ye how SIMPLEX TIRE & RUBBERCO. |“ pie 2035 S. Michigan Ave., Dept. 5, Chicago, II. [Ow Ce? ag

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172 POPULAk MECHANICS ADVERTISING SECTION "rae Bench Lathe Complete as Illustrated Price $36 For that home shop of yours OU can do all sorts of turning and boring jobs the minute you set up this lathe on your bench. Just the right size for a small workshop. Length over all, 25 inches; height, 1114 inches; swing, 7 inches; extreme distance between centers, 12 inches. Weighs only 30 pounds. Well-made and finished with black and red enamel. The bed is milled. All working parts handsomely polished. Live spindle No. Slide Rest has a cone bearing to take up wear. Tail 1 3 2 Price $16 stock has screw and lever feed. Cone pulley has three steps—-114, 21% and 31% inches in diameter. A complete line of attachments are avail- able to fit this lathe, such as slide rest, lathe tools, compression check and collets, milling attachments, turret attachments, etc. Interesting Bench Lathe Booklet Free Shows all the Goodell-Pratt Bench Lathes, also various attachments that enable you to do all sorts of turning, boring, milling, sawing jobs, etc. Gives . the amateur mechanic many new and valuable hints . No. Counter Shaft for working out his ideas. A post card will bring you | : a copy of the booklet free. Just ask for the Goodell- | Price $11 Pratt Special Bench Lathe Booklet. i GOODELL-PRATT COMPANY Bench Lathe No. 494 GREENFIELD, MASS., U.S. A. + Same construction as No. 125 above, 4 but slightly larger. Length over all, ° Sta 3l inches. Height 11 4 inches. Swing, : 7 inches. Extreme omer |e : ust centers, 18 inches. eight, 36 of nama Price, $40. . Makers of Mr. Punch | GOODELL PRATT | 1500 GOOD TOOLS

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wes } Ll POPULAR MECHANICS ADVERTISING SECTION THE MacMILLAN ARCTIC ASSOCIATION HERBERT. OmOGHAN @rorenr + cany oe Teasers ~ 4 Loo fDwaro ~ coome Vice Peemoeny town w Bra Donao® vee 626 TREMONT BUILDING, BOSTON, MASS Remington Typewriter Company, 152 Federal Street, Boston, Mass. Gentlemen: I want to tell you all about t 8} i ° rendered by the Hemington Portable Typewriter on our recent lie polar expedition. DONALD B MacMILLAN Arctic 6xplorer This expedition left Boston on J returned on September 20, 1924, @ period o Ye were frozen in for 3350 days at Hefuge land, at a latitude of 78-derrees-S2-minut often at 48 degrees below zero. Our little Remington Portable was used for taking and sending radio messages and also for writing a daily newspaper for the ship, which was posted on the mast each morning so that the men might keep in touch with the outside world. We received radio messages concerning the deaths of President Harding and Wilson, also information on conditions in Germany and France, on the fishermen's race, the World's Series baseball games, etc. More than 150,000 words were written on this Remington Portable, ana Mr. R. P. Robinson, who used the machine most of the time, states that it never failed him, and although carried about in all kinds of weather, it was always ready to do the work. The Remington Portable had absolutely no repairs mde om it during the entire trip except to be cleaned and oiled. Altbough the case shows a little wear and tear, the machine itself is in perfect condition. Ewrnustastic owners are con- that it is the recognized leader, tantly paying tributetotheun- in sales and popularity. usual ruggedness and reliability You need a Remington Port- of the Remington Portable. able, and every home needs one. This little machine possesses Write today for our illustrated every featurecommontothebig “For You, For Everybody.” office typewriters. No wonder Address Dept. 2. REMINGTON TYPEWRITER COMPANY 374 Broadway, New York—Branches Everyw ei Remington Typewriter Company of Canada, Limited, 68 King Street We ynto Remington Portable ee Everywhere

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174 POPULAR MECHANICS ADVERTISING SECTION Wonderful New Shoe - and ne like oe glove, os strong and urdy. Pp your foot troubles like no other. Money Back Guarantee on every ir. SALESMEN and agents wanted. D factory to wearer. Splendid opportunity. Interesting Gatalogue Free GREYHOUND SHOE Co. 120 Boylston St., Boston, Mass. Sse. MakeYour Tires ~ PUNCTURE PRO( IN ONE MINUTE Witenes poner AND Peak Wace) RADIO. “2 2 == FREE AIR LOSS ; Sont complete SSA roe | BARAWIK “COMPANY, _ 2403: Cllmton Strout NK fi “GALACIT rs cae Te ing the tire offthe wheel or in addition it will make the tir> Puncture Proof bet infor: tor white ge is seals instantly and permane ntl ., bune- THE GREATEST without obligation to outs today. ures, leaks, ces and leaky valves. o more Ha OSTWICH CORPORA no more getting out and changing tires n'a. hot sun.” No soll PROFIT-MAKER ‘®t _ 646 N. Michigan Ave., Chicage clothes. A sctentific A ay oduct. Tested in every “+ of the United 8 y a MONEY BACK GU ogres. = Ly 0 everything we claim. spmarantoes aes te awe e contrary it pr hens the e iife of ‘tube and tire, often St iettemsin dine Or vn BUILD A BOAT ; INCREASING TIRE MILEAGE FROM 10,000 TO 12,000 MILES Simple and complete directions for ake a hammer and dri il t , h, TOO taD. Gnahes 0 Sgerenie CREAT nen the ee building 21 kinds of poste and and catioes tures permanently, as soon as they are made. We guarantee & for are to found in opular Mechanics one yedr, but & wil last indefinitely. Boat Book. Tells how to make most CAR OWNER, AGENTS WANTED ||| cry ft stra i at ts aa EARN $5,000 TO $10,000 A YEAR ty te 7 ng 50c bo” to make anchors, lan TREMENDOUS PROFITS. Agents and Distributers everywhere to demonstrate and sell to car owners, a yy a Wor y ~ or spare oor bee your other boat accessories. bor borne or -_ own home town or traveling. La , sella itsel very customer omes POPULAR MECHANIC PRESS enthusiastic that he helps you sell his friends. A that ill make - inde adeate ‘You can aie manufacture and sell GALACITE* Popular Mechanics Building, Room 7Il, CHICAGO, ILL, INNER ays FREE ACT Quick #2 0 MONEY. Just your name and address wil! MAGAZINE bring = particulars by return mail, Get this in-- formation right now. Test it out. Get started while the field is still uncrowded. Afree subscrip- Der . 925, 19 W. Jackson Bivd. tion to Personal Cc. F. JOHNSON 8 & co. ULLINOIS, U, Ss A. | Advancement Trade Mark Reg. “Copyrw Ate1 926 . | | witheachorder. | Mail postal to- day direct to the publishers. ea 2 9 Beaderceel, SALESMEN! foo Sveky pay $20 EVERY DAY tir i ir. Mends i holes in 3p seconds, and they stay fixed! Flug 366 SHORT CUTS FOR ‘ er from inside with special Kex needle. plugs plug ey out water, dirt, sand. Makes 2 pi, lasting job! Every garage, tire repair shop, and auto I store a live prospect. Kit including 50 Mechanics New Carpenter’s Handbook Kex i dye nd needle-$ 50. No competition! Get Salesman's a rs led with illustrated short cuts and im: magroved methods proposition for your Territory N ow! for yo sore of corpentry work Lens os jobs. + idea kso was ove y @ practical man in course 0 work KUPESS SALES CO., 53 W. Jac m Bivd., Chicago, Ml. Each idea is practical, a time-saver, a money-saver. The 229 Pictures are so clear that in many cases, the picture itself explains the short cut. This new book is a book for profes- sional carpenters, for amateurs, and for boys. It is destined BRINGS YOU THE to be just as popular as the many other handbooks published HANDY, COMPACT inrecent months. This new book is beautifully bound in gold ENTERPRISE PORT- orew - aoe. , 2! handy size, and sells for the remarkal & ABLE STOVE _ oe ?¢ mply write a postal saying Send No Money es want Popular Me- chanics New Carpenter's Handbook. It will be sent C. 0. D and you may pay the postman the price of the book and th« few cents postage when he ielivers the book to you. If y live ou e the U. 8. or if you are not at home when the pos'- man delivers your mail, send $1.00 with your order. POPULAR MECHANICS PRESS Campers: Tourists: Have hot food— Hiot coffee—any time—any where. In- tense heat for 444 hours with one filling. Defies winds. Weighs only 7\lbs. Only *\% in. wide. Style 1. Gasoline, $6.50. Style 1-K. Kerosene, $7.00. Send P. O. Money Order for $1.00; pay postman balance. Room 706, Popular Mechanics Bidg., 200 E. Ontario Street, Chicago, !!!. AGENTS: Sell hundreds. Write for —— proposition. ee ENTERPRISE TOOL, & METAL OUTDOOR SPORTS THE YEAR ’ROUND Popular Mechanics New Dollar Book—Outdoor sports appe: | tous all. But the fun is double when you make your own de- = vices. There are 226 my 4 writte a see ee asem tet ling how to make equipment for a an pular sports many a VY Ne L. kinds in thenew Outdoor Spo book. There are clever de- - Vices for such sports as: 2449 N. Western Ave., Chicago, Ill, Swimmi T in: Photography flying Gamote “1 1 oboggeaing Tennis Summer games Football i Outdoor winter Nutting ot? ASK FOR MY NEW Swinging Fishing mes Pushmobiling acin fo Big Gold Producing Plan | | | iii!sycomtise golf pd Skiing Sider FREE SAMPLE oy aking nth, WINNER! It is easy to make the devices described because there are 317 helpful Illus Exclusive territories to AROF trations. The aSciales are clear enough for boys, yet interesting enous? agent distributors of the GL F | 9 to any men. 5 ont on 0 postal The greatest money-making and money-saving Glare | | Send No Money tard ard tay th that you want oe utdoor Sports the Protector ever invented — territory GOING FAST. {or Set, ee. th at Weal, 4 you = ou ive outside t oF. GN "sor if you are WRITE TODAY. — Chas. D. Symms, President. not at home wh a the postman , then send $1 with your 805-H Raad Street . 706. Popular Mechanics Bite, GLAROFF MFG. CO. .?otx Fatts*s">. POPULAR MECHANICS PRESS 225 Ponti "sc, cmcee> |

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; POPULAR MECHANICS ADVERTISING SECTION 175 _ | What the Trirdyn gets where its hotter than Jummer 7 Crosley Trirdyn—on the Sahara Desert at mid-day —brings in Radio-Paris on the loud-speaker! Not only at mid-day, but in February—in Northern Africa and far hotter than any American Summer. The picture above, a post card snap shot sent from Tunis to Mr. Crosley, by D. F. Keith of Toronto, Ont, tells this story on the other side:— Tunis, North Africa, March 3, 1925 Dear Mr. Crosley: Fishing here is rotten but radio is fine. On the Sabarr, using three tubes on the Trirdyn circuit, receptiopfrom> Paris came through on the loud-speaker. Along the South coast of the Mediterranean, using this set, six or eight 4° power European stations came in with good volume by day-light and all of them after dark. Can usually get a few American after | a.m. Can you fish with us thie year? Cordially, (Signed) D. F. Keith Further details on the margins of the picture:— Sahara Desert, 250 miles south of iers, February, 1925. Receiv- ing noon-day concert from “Radio-Paris, Paris, using aerial end counterpoise. Who said summer in America is a poor time for radio—if the receiver is a Crosley Trirdy» ? Every radio fan—actual and aspiring— is invite 1 to think this over and then act. On the Trirdyn is the beautiful new Crosley Musicone, radio’s most startling developmeni. The Musicone’s abilities and its beauty are so superior that we expect it to replace half a millionloud-speakers thisyear. $ 7.50. The Crosley Radio Corporation, 615 Sassafras St., Cincinnati Powel Crosley, Jr., President a “ RADIO _— cependotete Sate 20 Crcmet.te — Better~Costs Less

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176 POPULAR MECHANICS ADVERTISING SECTION ' Finishing Home-Made Furniture Is Easy—this Sure Way | You madea useful piece of fur- ‘ t | niture yourself, and you want to give it a beautiful finish. Because you know that im- proper finishing may ruin it and that any small defects will be minimized if it is well finished. The Johnson Book on Interior Wood Finishing gives com- plete instructions for finish- _/)_; ing all wood—old or new. Itis | nt i full of valuable, authoritative (\"% information on the fascinating subject of wood finishing. The coupon below tells how to get aFREE copy. JOHNSON’S Woop DYE —— a | titan 1 end a — (OP a owe « 4 ‘ dries in four hours—will not rub off or Select the shade of Johnson’s Wood Dye ay . smudge—and penetrates deeply, bring- you want and order it from your dealer ing out the beauty of the grain. by name. (~~ -FREE—25¢ BOOK ON WOOD FINISHING ~~~ Ask for a FREE copy of the Johnson 25c Book on Wood Finishing at stores displaying ¢ — the sign shown at right. These stores carry Johnson’s Artistic Wood Finishes ~~ ( SERVICE will be glad to show you wood panels — and answer questions on how to | DeRARTME® wm’ t bad ; 4 Johnson’s Wood Dye is just what you Johnson’s Wood Dye is made in seven- ‘ need for the artistic coloring of allwood. teen beautiful shades, among the most With it you can finish inexpensive soft popular of which are: e wood so it is as beautiful and artistic as 123—Dark Oak 131—Walnut hard wood. 129—Dark Mahogany 126—Light Oak Johnson’s Wood Dye is easy to apply— 127—Brown Mahogany 124—Golden Ocak finish wood. If no store in your locality can supply the Johnson Book—mai this coupon for a copy—Free and Postpaid. YOUR DEALER’S NAME................ a ala ss a JOHNSON SESS IO A RE RT Sahara a hy aipyiie Your Address... Ree ae ee wb WOOD I, City and State... celicenteditatine FINISH! Ss. C. JOHNSON & SON, ‘Dept. P.A.6, RACINE, WIS. POPULAR MECHANICS PRESS

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