Popular Mechanics 1928-06: Vol 49 Iss 6

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Popular Mechanics Magazine 200 E. Ontario Street, Chicago, U.S. A. H. H. WINDSOR, Founder H. H. WINDSOR, Jr., I ditor and Publisher London: Hachette & Cie., Paris: Hachette & Cie., Melbourne: Gordon & Gotch 16-17 King William Street, Charing Cross, W.C. 2 111 Rue Reaumur 509-513 Little Collins Se

ISSUED 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. Please examine the date printed on your wrapper. Entered as Second Clase Matter Sept. 15, 1903, at the Post Office at Chicago, Illinois, under Act of March 3rd, 1879 Entered as Second Class Matter at the Post Office Department, Canada Published monthly by POPULAR MECHANICS CO Copyright, 1925, by Popular Mechanics Co Copyright in Australia. Copyright in France

Vol. 49 Contents for June, 1928 No.6 Special Features Motorless Ships of the Air 888 The Man on Foot Strikes Back 898 Tigers of the Insect World 907 Do the Stars Rule Our Destiny? 914 Home, Sweet Home of the Future 923 The Border Patrol 931 Burning ’em Up 939 The Iron Horse Snorts Defiance 946 Wrong Side Up! 957 Conquering Age-Old Sea Perils 963 On the Trail of the Quake 973 Easy Pencil Tricks 993 Air Mail—letter box sings and talks to advertise Cattle—hoof-and-mouth serum helps save 943 Airplanes horns grown in laboratory tests 922 faulty testing is one cause of crashes Chimes—porcelain belis for chapel 897 fireproof coating for wings Cigars—pictures from bands form gallery 987 five-motored tandem, to carry 200 Coal Mining—frozen gas as powder substitute 983 telephones for Cottonseed—many uses boost crop’s value 953 with door in nose to serve as ambulance Crime—catch crooks by telephone 974 Automobile Bus—front and rear exit to speed service Disk Grinder—<catches dust and promotes safety 999 Automobiles Dogs—ancient models found in Palestine 935 gasket tape saves time and work Doors—pronged band to hold jambs eliminates nail holes 977 rubber disk replaces spring Earth—rate of rotation changes 976 that flies also serves as fast motorboat Earthquakes—several every day at sleeping volcano 897 Automobiles—Accessories Education—magic lanterns on desks help teachers 975 ball-bearing shackles eliminate squeaks Electric Lights—flat extension cord fits under rugs 986 bumpless seats can be folded Engine, Steam—old, converted into monument observa- sunshine hood for car tops tory 973 Automobiles—Cleaning Ether—perfume sprinkled on masks for quicker sleep 911 polished by electric drill with shining unit Fireworks—suit of, produces novel display 935 speeded by hot spray generator Fish and Fishing Automobiles—Driving—prism helps driver see signals fertilizing fish farms 955 Automobile Trucks—tilting service, helps bring in goldfish killed by too much kindness 928 wrecks 961 Flute—played like trombone gives wider range 927 Aviation Forgery—ultraviolet rays reveal forged check 988 armless flyer plans trip to Paris 973 Gasoline Engine—cools itself without water 954 England-Australia air line to have huge ships 936 Geology—footprints tell of ancient life in Grand Canyon 988 French transatlantic air martyrs to be honored 913 Glass—Egyptians made best of ancient craftsmen 999 Square parachute tested for naval aircraft 954 Giasses—visor, for autoists, relieve eye strain 976 Baby Carriage—won’t tip over while crossing curb 906 Golf Banks—paper-money counter saves time and loss 992 ring big bell when green is clear 999 saseball—coin-in-the-slot game tests player's skill 905 tee has arrow guides to aid stance 944 3icycle—that climbs poles also serves as boat 911 Greenhouse—on wheels for delivering plants 983 Boathook—improved, also holds mops 974 Highway—elevated, to cost sixty million 955 Boats and Boating—rolling boat latest in motor craft. 943 r with four toes 944 30wling—ball’s motion studied to improve game 983 Household Devices 990 Bridge—New York-Vermont shortens motor route 956 House Plan 1056 Burglar Alarm—trap bank bandit by raising hands 982 Ice—at South Pole sufficient to cover world 937 Cards, Playing Ice Cream—cone shaped stand attracts motorists 988 for the blind have raised figures 913 Insects—weather made to order in war on 945 tiles permit outdoor games 928 Kettle—electric water, whistle to prevent overheating 955 [Continued on Page 4]

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[4] [Contents—Continued] Language Typewriting Supplies—sticky tape on eraser lifts letters 956 origin of common phrases iat ‘ 912 Umbrellas—with window panes to prevent accidents 953 study aided by voice recorder 897 Wading Pool—portable, is playroom joy 953 Light—photo-electric cell to gauge at North Pole 913 Lock—chain, resists tampering 927 Lock, Canal—Dutch is larger than Panama’s 935 AMATEUR MECHANICS Machines—that replace human hands and brains 984 Ants—effective exterminator 1036 Magnetic Pencil—for doctor removes bits of metal 897 Automobiles—Accessories—hat holder for sedan 1021 Mail—crewless trains speed in London tunnel 929 Automobiles—Repairs—remedy for squeaky brakes 1038 Maps—magic draftsman traces direct from photographs 988 Balcony—is cheap substitute for porch of small home 103) Mattress—of rubber tubes is easily carried Batteries—increasing voltage of run-down dry 1036 Minerals—X-ray “‘fingerprints’’ of rocks to aid industry 906 Boats and Boating—rowboat operated by bicycle mech- Mirrors—help pedestrians keep neat 937 anism 1027 Molds—spray gun for dusting, aids foundry processes 1000 Box—ornamental, decorated with buttons 1029 Moving Pictures—Egypt’s mummy fluid used for films 953 Bread Knife—improving 1019 Nail—that won’t split wood 956 Broom—rubber cap on handle protects varnished sur- Oats—smut disease cured by dynamite dust 943 faces 1028 Package Tyer—wraps forty bundles a minute 930 Camping—improving canvas bed 1038 Paints and Painting—sprayer on vacuum cleaner saves Canvas—paraffin used for waterproofing 102? hand painting 961 Cooling—device for kitchen air 1019 Pencils—easy tricks with 993 Cot—camp, made comfortable with rubber straps 1029 Phonograph—automatic unit changes records 975 Dirt Chute—for the kitchen 1021 Photography—rapid printing press eliminates trimming 987 Electric Lights Playground—on roof for football and tennis 986 “‘Aladdin’s lamp” 101 Pliers—with parallel jaws get perfect grip 906 installed inside cupboard, have automatic control 1027 Poultry—brooder ventilator serves as smokestack 944 Fish and Fishing Radio oe beaded hook attracts 103¢ battery supply from farm-lighting plant 1013 fishhook improved to hold insect bait 102 dry rectifier-replacement units 1015 Gasoline Hose—rain cap for 102 flashlamp makes pocket tester 1014 Lawns—protecting 1037 hidden lock for radio console 1011 Measuring Cup—adjustable 1022 homemade volume-control device - 1013 Motor, Outboard inexpensive panels Peery ; 1004 bracket holds on auto Gee 1020 simple wire-tinning device... ........... 1015 detachable handles for 1029 variable resistance improves set ey eee 1016 Paints and Painting Radio—Aerials aluminum paint for auto rims 1035 ROSA PST Cree eeere rc eerrr cree 1004 method of preserving paint and enamel 1028 spreaders for cage tetas 1013 Photograph—holder on manuscript 103 Radio—Amplifier—building a perfect-tone ....... 1007 Photography—stunts for the camera 1023 Radio—Applications Rake—magnetic, picks up nails 1035 music by phantom orchestra 977 Razor Blade—cork holds for ripping 102 ( power, light and heat sent out by tube 921 Reservoir, Hot Water—cleaning of silt and dirt 1018 Radio—Batteries Scooter—foot brake for 1019 caring for A 1014 = Screen Door preventing charger hum 1001 fastening hook securely 1035 | Radio—Coil—forms for low-loss 1012 handie on hook permits opening from outside 102) Radio—Installation—homemade ground clamp that Ship Models—Flying Cloud 1031 grips ste 1004 Signs—tape for temporary 1021 kinks for cone-type —_. 1012 Siphon—how to start 1038 midget is five inches high 1001 Stove—cooking on a “‘tin heater” ‘ 1033 twin-cone unit 1015 Tacks—easy method of removing 1028 Radio—Pictorial . . 1005 Teakettle—hanger for, on stove ie hen’ 103¢ Radio—Receivers—increasing sensitivity in tuned r.f.. 1013 Tent Radio—Reception—comfort pads for headsets 1011 Se oe ee ee 1028 Radio—Repairs—the radio doctor . 1002 how to fold single OT aaa gigi eh tet 1034 Radio—Resistors—new clip-mounting are wire-wound 1001 Thermos Bottle—electric heater for wii on 102° Radio—Tubes filament control for a.c. eliminates power rheostats 1001 oe the latest in super-power 1016 SHOP NOTES Railroads—man-made earthquakes help survey 936 : = Rays, Cathode—tube gives off radiation equivalent to Automobiles—Repairing : covering ignition wires epee 105! ton of radium 992 , >. - ‘ Rays, Cosmic—show earth still in process of creation. 927 B er ye if armature shaft is bent tee 1055 Rivne enn dor talie 977 ees—face protector for keepers errr 1052 : Bibcock—homemade facing tool for seat 1042 Rubber—lighter than cork 945 Boati oe Rubbish—handled better with inclosed truck 943 Boats and Boating—painting boat bottoms 1054 Saws and Sawing—motor driven that cut stone speed Box—reversible lid 1051 Cellar—guard for the trapdoor 1042 cathedral work 987 : - : . : "tage Chain Sling—self-tightening ; 1054 Ships and Shipping Pa 4 : battleship has fighting face 976 lock—mantel, made from old alarm : . 4039 battleship is turned into airplane carrier 912 age genane gr friction ' ‘ oon Fo plane carrier is giant task 937 Feed Box—removable ‘ - 4 1055 . ee : : : : asoline Tanks—precautions when solderin 1048 coin-in-slot polisher gives bright shine 936 Ladder—guard a stationary 8 1048 made from old tire casings 989 . nathan tot tin Geers 1052 Skylight—chain lift aids ventilation 942 Oilletone—non-elin holder for 1048 Smokers’ Accessories—coin-in-the-slot cigar-lighter fill- Pp - a 92 Paints and Painting—device for painting stripes 1049 So ing stand i i aid pe Pipe—vise helps laying 1049 SD ren is latest ee = , h 1 956 Plaques—artistic, are easy to make 1043 Song Pee ment a lates singers ome rehearsa - Poultry Netting—dispensed by turntable 1041 Telephone—silence shutter prevents overhearing 44 Roofing Paper—how to nail 1055 Television . Rope—dispenser for hardware store 1050 aided by quartz and improved screen 935 Safety Devices and Measures—safeguard for railroad links ship to land in successful test 982 crossings 1055 Theater—stage and audience revolve in German 928 Sand—sliding device improves sifter : 1042 Tools—mechanics’ clamp and block simplifies small jobs 998 Studs—calculating number required in a wall 1050 Toys Telephone Directory—that saves time 1050 animal circus helps educate children 922 Wheelbarrows—hoisting sling for ............ 1051 racer foot car for children 954 Wire Stripper—made from hacksaw blade ......... 1041 Trafiic—human heads warn speeders to obey laws 953 Wood Trees—trunks swell at night and shrink by day 936 I cd kuna spew sbebeedeaaas 1052 Trench Digger—does work of many men 974 simple way of bending thin .................. 1054

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Copyright, Professor Glatz Viennese Are Able to Enjoy Skiing and Ski Jumping the Year Around Since the Main Hall of a Former Railroad Terminal Has Been Converted into a Winter-Sports Field, with Artificial Snow, the Invention of an Englishman, on the Slides; Similar Year-Around Snow Slides Are Being, or Have Been, Installed in Berlin, Dresden and a Number of Other German Cities

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Popular Mechanics Magazine REGISTERED IN U. S. PATENT OFFICE WRITTEN SO YOU CAN UNDERSTAND IT Vol. 49 JUNE, 1928 No. 6 Italian Workman, Suspended in Mid-Air, Installing the Generoso Antenna Plant Where Lightning Is Collected on Long Cable; 30,000,000 Volts from a Single Flash May Be Gathered THE old dream of harnessing the light- found thev can collect enough static to ng and putting it to useful work may produce a spark a second With 30 e on the way to realization, as the result 000,000 volts to work with, they will be experiments bv three scientists of the able to produce extreme] rapid cat] de niversity of Berlin, who have taken up rays, similar to those generated in the nev e task where Benjamin Franklin left Coolidge tube, and rivaling the prin ore than a century and a half ago. ravs of, radius except that the rate of On lottv Mount Generoso, in Switzer- emanatio1 vill be tar faster t nm it l nd, they have plucked nearly 2,000,000 radium itselt out of the storm clouds and sent: it The three experimentet ) A. Br I hing ove ark gap hiteen feet in | La ¢ ind ( ) 1 ¢ ; It nl oO i e ¢ eT ¢ tT During the coming summer, when — established for the first time the nature torms are trequent over the Swiss moun- ghtning, by suspending their collecti in, thev expect, with new and _ better antenna from a cable stretched betwee ollecting apparatus, to gather in 30,000,000 two mountain peal Thev used a T volts in each discharge. They have already meshed wire net with an area of seve

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882 POPULAR MECHANICS Observations and me¢ vere made f1 a lightning-proot me house, grounded to 1 ve danger to the ex imenters. From it tl 11 1 controlled the sparl hich recorded th age by indicating the d tance the lightning fla could jump through tl air. In the initial exper ments they did ni achieve as much succe already been re as has corded in the laborat with artificial but by lightnit the net higher they expect to get at least raising fifteen times a much pressure. The highest voltage ever produced by maz 5,000,000 volts. was re cently recorded at the Car negie Institution, by Gregory Breit and Dr, M Spark Passing across the Small Preliminary Plant during a Thunderstorm, and Diagram of the Antenna Instal- lation; Note the Collecting Net in the Center Gap in cali ie hundred square yards and a weight too great to be supported in a storm by either kites or balloons. To suspend it a cable was stretched over an 1.800-foot cha m, with the net swung 250 feet above the ground, protected at either end by long chains of huge insulators, capable of checking up to 3,000,000 volts of electricity. To prevent so-called “brush discharges,” or corona effect in the conductors leading from the net to the spark gap, cylinders were substituted for solid wire, as the car- rying capacity of a conductor depends on its surface area, and better a large cvlinder is a conductor than a solid wire taining the same amount of metal. con- CORONA SAFEGUARDS OBSERVATION CABIN SCHEMATIC VIEW OF ANTENNA SYSTEM INSULATORS } ——— “INSULATORS NETWORK y ee COONS \ A. Tuve. They succeeded in impressing a million volts on a vacuum tube with out- side electrodes, The Carnegie itists are aiming at the same goal as the Germans, 30.000.00( moot t volts, at which potential many of the questions of physics may be settled. The retically, it may be impossible to have ra diation at this } igh voltage, since the elec tron would be damped and all wavelengt! Lf 30.000.000 volts can be produced and handled it would make possible the ould become one, production of helium atom each one four atoms of hydroget Such conversion of matter might solve the from lighter-than-air flying-craft problem.

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POPULAR MECHANICS 883 MOVIES SENT BY PHONE TO SPEED UP NEWS REELS Filming a Movie Star in Chi- cago; the Picture Transmitted, and Sending Apparatus ransmitting news reels of current been in service for the last ent re 1co t r oO the dav the eleph ) ra 1 en is a ( po itv, it was tog ated rece he 11 vie Oo! r five b eve | i¢ ( yO as she steppe | egative trom ¢ { € bot i ho \ bet € » SeVe is tele ¢ to New Y ork l t \ ! ¢ » he ho eatel there ¢ ’ even g eI telephoned m« ¢ ) Ice ne po it perfec enor is enlarg¢ by tele \ ent on the theater screen being rather the process sut it proved that, with further de movie fils Five hou fter the 1 ypment, the process may be a success. tion of taking the pictures had ransmission of the movie film used the Chicago, enough film had been transmitted ame apparatus and methods which have to make ten teet ot movie

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884 POPULAR MECHANICS ONE WAY TRAFFIC i THs | ENTER PETWEEN THE KALE HOUR & TEN mimuTeEs To THE nOVAR |] and signs aid the torists. At one pi the directions are ter only betwee the hour and ten ite the hour, while, other, cars may mence the journe tween the hour and minutes to the half The tunnel is at an « vation of more t! 10,000 feet and save rough trip, over ste hills, into the Eleve Mile carryon, one of tl state’s minor gorges. mheEL VOICE AND PICTURI CABINET GIVES LECTURES Illustrated lecture without a human speaker At Entrance to Old Railway Tunnel Now Used by Automobiles; the Clock and Sign Help Regulate One-Way Traffic ONE-WAY TUNNEL FOR AUTOS ALSO AIDS IRRIGATING Although it is now abandoned for rail- road purposes, an old tunnel of the Colo- Midland double purpose, for it is used by automobiles and also as an irrigating flume to water more than 20,000 acres of rado railway serves a land. The passage is but one stretch of the old railroad line which has been adapted for highway uses after the engines and cars w ere taken off, due to the discon- are given by a combina tion stereopticon ar phonograph an inventor has introduced. The records synchronized with the and all an attendant has to do to change the records and a set of slide at the proper time. The entire outfit mounted within a compact cabinet. eastet showing of t slides, PHONE SET FREES BOTH HANDS AND INSURES PRIVACY By attaching a special mouthpiece and ; holder for the receiver, an ordinary tele inuance of the rail- road. It is two miles long and has a ftour-per-cent grade. Because it is so straight, no arti- ventilation is but auto- ficial necessary, must be run through on a mobiles caretully regulated schedule, since the tunnelis wide enough for only phone instrumet is quickly converte into the “mon type familiar abroad. The ar rangement leave both hands free ar the mouth piece so shaped as to pet mit clear conversa tion with less likeli hood of being over heard by othe near by. Both at tachments can be one car at a time. Clocks at either end Using the Telephone without the Hands; the Mouth- piece and Receiver Attachment in Service put on and taken off quickly.

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RE b 4 ~” POPULAR MECHANICS GREAT MACHINE RULES BETTING AT FRENCH RACES ane “ a + Exterior View of the Betting Announcer, and Glimpse In- e at the Complicated Com- ng Apparatus Which ckly Tallies the Odds and Gives the Results | lo show the number nature of the bets laced on different ‘ses under the part- utuel systems at race icks, complicated iachines are em- loved to compute the rids and the amounts 1 1 } ich horse will pay. One of the most elaborate units of this kind has just been finished for the Longchamps course near Paris. It is housed in a building of dis- tinctive architecture, the figures being hown in a series of slots LIFE OF RACING AUTO TIRES LESS THAN FOUR MINUTES One of the most important factors in 1 the success of a racing automobile is the 1 tires When Major pegrave Was asset! bling the car in which he attained a spee of more than 207 miles an hour at Day ert = ay eee eee er er ee es le Poni oS Se Gey Sr cer er er ee ee ee

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POPULAR M | Will He Find the ‘Lusitania’ Bell Which Is Equipped fot ’? Inventor Taking Descending in Movies under the MOTOR-DRIVEN DIVING BELL FOR DEEP-SEA MOVIES Motion pictures under the sea at depths heretofore impossible are expected with 1 of the aid cently tested. a motor-driven diving bell re- It is equipped with four powerful searchlights, can carry two per- SO n weighs nearly 5,000 pounds and is : moved by propellers. The inventor hopes to be able to de cend in it over the wreck of the “Lusitania” and take pictures. SIZE OF SUN KEEPS CHANGING MEASUREMENTS SHOW That our sun is like a big fiery heart that beats at a regular rate, becoming al- ternately larger and smaller, is the inter- esting disco\ ery of scientists at the astro- nomical observatory in Rome. These “beats” occur over periods of eleven years and can be measured only by the most ac- curate instruments and after painstaking In scientific terms, the discov- ery means that our sun is a pulsating star. checking. ECHANICS d Its then decrea es. of furth that it has a dir iameter becomes larget Ch Val ie i fie iti er interest for ect relatio occurrence spots tl oft I sun. on Just before e greatest numbe e face of the period of th spots, gre the diameter is and smallest when spots are lo this, | every sunny day for the last years and more, have been n discover observers | ing careful measurements of t sun at Through an a nomical telescope which produc: noon. . an image of known size, the su was projected upon a white scree | and there measured by means a network of thin order insure cobwebs. to close accurat the measurements were taken | : . three scientists, each repeating operations seven time WICKS IN HUMIDIFIER SPEED EVAPORATION Cloths in dipped water and Diving hung on a rack in a radiator Sea 5 : midifier now on the market, spee evaporation and so insure a better mois tening of the air in a room. Heated a from the back of the radiator, is caught by a protruding apron at the container and is drawn through the fe toons of the cloth which are hung inside rhe back of the increase in evaporation surface 11 rift ALLE what makes the 1 ethncient. Cloth Wicks in This Radiator Humidifier Absorb Water from Pan and So Increase Evaporation

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POPULAR MECHANICS INDY’S NEW PLANE WILL CARRY FOUR PASSENGERS Col. Lindbergh's Historic “Spirit of St. Louis,”’ Ready to Be Retired for Preservation in the National Museum, Has Been Replaced by a New Ryan Ship of the Latest Brougham Design; Built to the ‘‘Lone Eagle’s’’ Own Specifications It Is Somewhat Larger and Has a Comfortable Glass-Inclosed Cabin for Four Passengers Mechanics Installin Mot of the New Plane, Above, a Left, the Cockpit and Instrument | with Pilot and Four Passengers, the Ship Can Climb to 16,000 Feet; the Cocky Comfortably U pholstered in Au Styl ith Silk Mohair Ter ich Lights Are Built into the Leading E f the Wing Tips, Special Windows Are Low Down in the Fuselage to Give the Colonel Good Vision Below: the Tail Skid Is Fitted with a Caster Wheel; Landing Brakes, Op g the Wright erated by Peda S$ on the k ider Bar Are Placed on the Whee ind a Full Set of Special Navigating Instrun vided ire as Well as a Release { ] ; : Night Flying the New Ship Has a Top of 126 Miles an Hour, Weighs 3,600 id and Can Carry a Useful Load of ; / 1,550 Pounds the 115-Gallon Gas Tank : Gives It a Cruising Radius of 1,000 Miles ‘ without Refueling; a Thick L sam Wool between the Outer Fuselage and the Cabin Upholstering W I ise to a Minin Lindbergh’s New Plane, Showing the Extra Windows in the Cockpit and the j Landing Lights Built into the Wing Tips F

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\ FEW months ago Ferdinand = German _ flyer, pent fourteen hours and eight Schulz, a minutes in the air one day, glid ing around in a motorless plane. He took off from a sand dune at Rossitten, near Koenigsberg, soared up on an ascending col- which was umn oft Warm arr, climbing al he heavy cold ove 4 1 currents off the sea, and con- oar and glide and dip through the day and into the night Two davs later, at the same place, Pilot Nehring and a friend clit ibed into the cockpit 974 + ] | . ot a MOtOTrless monoplane, a group ot triends grabbed the fly ing rope, took a=short run the sands, and cata with its two through pulted the ship passengers into the air, where they stayed for five hours and twenty minutes. Schulz, months earlier, had taken a passenger up for nine minutes, but the 1 hours and twenty-one | ie not ony record Was disallowed because } carried a passenger along, but likewise an engine, though he didn’t use the latter. davs after He set another record ten Nehring’s feat, however, by hopping off at Rossitten and riding a wind current across country for nearly thirty-nine miles before he came to earth. From the first crude gliders of Otto hanute, of ( hicago, and the Wright brothers, to the latest German motorless machines, is Lilienthal, the German, Octave ( a far step. The early gliders, frail struc- tures of bamboo and fabric, built some- times like a giant box kite and again, as 1 Lilienthal’s clorified bat, would do, as their name im- 1 mode!, like an enormous 1 8&8 RO I rts é PL ey plies, just one thing—glide down the wind and, if the lucky, land him safely at the bottom. 1 | ! from some height, pilot was ie latest machines are than eliders, more for they not only glide, but soar, and therein lies the secret of their ability to remain aloft for many hours, make long journeys across country and climb, as Ferdinand Schulz did ast October, to a height of . er near Marienburg more than half a mile. On that occasion he picked a favorable air current, rode it up to a height of 2,566 feet above the earth, and continued to float about up there for more than four hours. All of the g experiments, which led eventually to the perfection of the motor-driven early glider airplane, consisted in straight glides, never exceeding more than

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i ne Py . ~,. Bigs “3 launches to r t the end of a light rope, just as a captive kite is flown by a bo 4 Chere one difference, however. n that the crew hauling on the rope supple ented by a second crev that hol he plane ae the Tu eT et up eed \ a their hold an , pu pulted into é W he t reaches a he t ent to fifty feet, t pilot pt re lease leve ee yr the t one and the O1 ‘ | Suc ce 1 g le crepe d « the pilot’s knowledge of air cur rents. Hills make good ing points because there is usu ally an ascending ct imn ol on one side. Any change in the terrain below. as b oon pilots long ago have learned, mea ew hundred feet in length. The glider change in air currents alott. Pa ot, taking off with a short run from from smooth ground to rough, fr open lltop, would rise a few feet in the air country to a forest, or vice versa, fro most, and glide to the ground again at over land to water, all can be utilize e foot of the rise. During the descent, a clever pilot to get more altitude by fac ually made with his body hanging be- ing his ship into the risit w the framework so that, by throwing _ the lift exceeds the nor loss of weight from side to side: he could in a glide. As altitude is attained, 1 eep his balance, the shifting center of ibility to stay up ger ¢ vity formed the only control, a control currents are more pronounced a1 the » tricky that it ended many flights in dis- wind blows harder, as a rule, at eate ter, and caused the death of Lilienthal. heights. he new motorless airplanes are en- Some of the German student 0 é rely different. Sitting in a comfortable been flying for the last six vears in the ckpit, the pilot operates rudder, tail constantly improving models have be é ppers and ailerons through the same sort so familiar with the air currents that the controls as in a motor-driven plane. can pick a destination in ad ce, a ie usual method of taking off is to be then go to it. Nehring the first to

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S90 POPULAR MECHANICS make a predetermined flight. He took the air from the Wasserkuppe, flew to Milseburg, returned to and his starting point. Another German pilot, after mastering then Kegel, the science of motorless flight, fourteen-horsepower added a small engine to his machine, used when the wind was not favor- to be only able, and succeeded nl flying around the Zugspitze moun tains in the Bavarian Alps at a total cost gasoline of entirely for about $1. He ascended more than two and a half miles un- der and then utilized the air currents most of the make the trip. pow 3 time to German Tail, Students Assembling a Glider’s and Dr. Peltzner in an Early-Style Biplane Glider One of the Germat pioneers, Espenlauh, it troduced a the R meet 14 novel \ ossitten glide 1 last vear when brought out a machit that was towed aloft b a motor-driven plane When he reached tl desired height, he cast off the tow rope and proceeded to glide fo coming So little is needed to tow the ers hours before down. power one oO well-designed glid- that machine was taken light airp equipped with Espenlaub’ aloft by a lane only twenty-five horsepower puts it in the light airplanes built 1 the United States. Forty horsepower is which the class of smallest

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POPULAR MECHANICS 891 lered a small “flivver” plane, but with —= gliding offer chean aviation for the horsepower less, the German pilot student. Once the fiver has masters ds in flying not one plane, but two machine thoroughly, the Germa have motor ship and its trailer. demonstrated the p: bility of addis st of the German gliders have been cheap light engine ; in auxiliary. just by engineering students of the va the owner of a sailine vacht ut j “ universities, who have organized motor auxiliary, to take ler-lying clubs, just as is now being when the wind fails, A well-built glider by several American colleges whicl can be powered with a motorcycle e aviation schools. A glider can be light-car engine, and still be used for t for from $75 to $200. the expense de- ing when the air currents are favorable. ling on the degree of finish and equip- Few airplane pilots today have had a1 nt desired. experience with gliders. Lloyd Bertaud (he visit of the German pilots with the who lost his life when the “Old Glory ‘k of their machines this vear for exhi- plane disappeared at sea in an attempted tions under the auspices of newly formed flight to Rome last year, was one 7 O ling clubs is expected to start gliding got his start that way. Years ago, as a a sport in America. A half dozen or boy, Bertaud built a homemade re of the best ‘rman ships are from plans pub- lished in Popular be flown in sev- Mechanics during ral meets. the early days of the Because of the Wright brother first cost, the experiment hsence of expen- he knowledge of e engine repair | the elimination all fuel bills, currents gained by experiment vas essential to the Taking Off in a Glider Built by Breslau Students; the Starting Rope Has Just Been Cast Off by the Pilot; Above, Assembling an Entry in the Rossitten Coast Contest

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892 POPULAR MECHANICS > Wright Brothers, Flimsy Contraptions of Bamboo Fabric, Controlled by the Gyrations of the Pilot's Body to the Modern Gliders with Seats, Control Levers and Even Cockpits, Is a Long Step; Above, Plane Built by Harth, a German Architect of Bamberg, Who, in 192 Made a Twenty-Five-Minute Soaring Flight, Breaking All Records; at the Left Is the Passenger Car “Goetz von Berlichingen,” with Pilot Wolff Below, Men and Horses Pulling a Contestant to tl of a Sand Dune for the Start of the Coast Gliding Con tests Held by German Flyers Last Year; the Moder: Machines, Which Remain in the Air for Hours at a Time, Actually Soar as a Bird on Ascending Currents o Air, Whereas, Prior to Harth’s Flight in 1921, All Motorless Planes Simply Glided Down from a Hilltop Start without Means of Controlling the Descent From the Early Gliders of Lilienthal, Chanute and the and 894 POPULAR MECHANICS

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POPULAR MECHANICS 893 and other filvers, for they rights | so little engine er at their com- nd that a moder- ly strong wind cht be fatal, -un- they knew how utilize it to keep ft. Modern air- nes, with enough ver to fly through sixty-mile gale nd still make head- Vv, are practically dependent of the until the Germans took it up gain, kite flying nd gliding lan- uished. nd, so, Strangely enough, he credit for the revival goes to the tatesmen who met it Versailles after he armistice to WMNHMOYWOTYTT ayy? Two of the Latest Types, Showing the Highly Efficient Streamlining and Perfection of Form; That Below Is a Type Used by Espenlaub RAROTF ART OOS draft the peace treaty. They had no such object in view, but vere merely trying to prevent Germany building up a mili- tarv aviation force that might again menace the peace of To accom- that limited Europe. plish aim they the engine power which could in German Denied an for their en- be used planes. outlet ergies in building high-powered mil: tarv machines, the flvers, im the German poverished by took up soar ing flight as a cheap torm ot sport R05

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894 POPULAR MECHANICS BYRD TO FACE MANY PERILS ON SOUTH-POLE TRIP ae y . . THE ANTARCTIC IS A RE x { PRODUCTION OF THE ICE . AGE OF AMERICA AND EUROPE . THIS REGION AFFECTS THE WEATHER | OF A LARGE PaRT oF , THE WORLD

/f ALSuANOe

Z ee” ae "ha att > p __— =. LAND P QUARTERS ON THE GREAT ICE Ao ee BARRIER , WHERE BYRD WILL fim — a ESTABLUSH HIS BASE » — - ef “S .'-> , . ra + » : é > — ZO a ——- wy ‘ COATS LAND J) . FAO ja ‘ Pu . Ae > = >* - iit Si ~ e ig! : a" “ate Baty . ee ee, | ? | BASES WILL BE LAID DOWN TowarD | Oy“ = = . (/ ae — ' Sige * f 2, F -| THE POLE AT 1OO-MILE INTERVALS |". “ge eg J a's era , a hom” _] THESE WILL PROVIDE A SOURCE — aS op ae en | sell €y71 7 | OF SUPPUES SHOULD THE PLANE we yy} a! Yai ~ ; . — Db / : _— = © 2 tn em LAND Si? ’ _— e& NORTH LAND“ ae4 2, a. 0. o> KEMP : . SABRINA LAND Sune LAND - NEW ZEALAND . ‘ KNOX KAISER WILHELM 11 = ‘. ‘ LAND LAND - “0 bg : a nc a One of Byrd’s Planes with Landing Skids on Trial Ge Flight; Map of the Antarctic, and the Commander in Travel Togs Will Commander Byrd reach the south pole and return? Will his airplanes be of practical service ? Is the proposed jour- ney likely to be more hazardous than the north-pole trip? While the explorer is making final preparations for the antarc- tic dash, these and many other questions are being asked all over the civilized world. The first two cannot now be an swered. But, as to the last, men who have been tar down among the frozen seas of the south, declare ‘that there is scarcely any comparison between the two journeys on the basis of risks and difficulties in- volved. The south-pole expedition, in all probability, will be infinitely harder. In

the first place, the north pole is at sea ture at the northern top of the earth is level. The south is on a high plateau at only just a little below freezing. But an elevation of nearly 10,000 feet. If Byrd summer, which comes in January in the flies over, he will have to soar above this antarctic, is normally as much as fiity rough hurdle, besides facing the difficulties degrees colder. Scott had to fight through of landing and taking off where the coun- temperatures of nineteen degrees below try is a jagged jumble of forbidding ice zero, Fahrenheit, and lower, on his fatal and the perpetual snow deceives the eye. south-pole journey. The third factor is Then, there is the temperature. syvrd = the severe wind. A ten-day blizzard that found the weather delightfully mild when kept Scott from reaching a depot only he slid over the north pole in his hum- eleven miles away, proved his undoing ming Fokker. The mean July tempera- These storms commonly spring up with

ROKR mOrYr4revyTi at acrwmowrmraarrmnm

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POPULAR suddenness, explorers state, some- attaining a velocity of 150 miles an They drag a drift of snow with them, blotting out the land- below, although the sun may be clearly just above the ice cloud. are the principal hazards that face in who would conquer the south But there are bright sides to the e In spite of storms, periods of fine weather are not uncommon. ‘cap presents a better landing sur- for planes than the pack ice, such as ound over the north pole, and the craft of the air will swallow up stances and greatly diminish the equired for travel, an exceedingly rtant factor if the explorer goes on r by dog sled. n gusts, “SAFETY CITY” SHOWS HOW TO AVOID ACCIDENTS ature traffic accidents of all kinds in a twenty-foot model of the city etroit, to illustrate the results of im- er driving and disregard for safety The display, which is an accurate oduction of the main part of the city, streets, buildings and other details to scale, has been arranged for a of the state to teach safety lessons. al lighting effects have been created, eby darkness appears to fall upon the city. Moon and stars appear, auto llights are turned on, train and boat ils are lighted, and electric signs blaze Miniature machinery runs in the factory building, and the entire lel reproduces the busy life and traffic. MECHANICS ie) oO wn Noise Producer in Use, and Part of the Measuring Ap- paratus at Bureau of Standards TESTS WITH MAN-MADE NOISES MEASURE INSULATION Scientists at the bureau of standards have devised various noise-making instru ments for the purpose of testing the sound- proof qualities of insulating materials sub mitted for examination. One of the noise units 1s a crystal of quartz, through which an electric current is passed, producing a definite sound. The intensity of noises made in this way can be accurately deter- mined so that the results of the tests on the samples will be far more conclusive. sy — on- Animated Model of Detroit; Small Lights Flash, Tiny Cars and Autos Glide About, and Regular Traffic C ditions Are Duplicated to Teach Safety Lessons

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896 POPULAR RADIO BEACON TO GUIDE PLANE ELIMINATES HEADPHONES Guiding airplanes by means of a radio an audi- ble signal when he departs from the right course, is now improved in control, which tells the pilot by an apparatus MECHANICS SZ i> i Lx] KI AlxTx R Plane Equipped with the New Radio-Pilot Instrument, and, at Right, a Guide Tower which eliminates the use of headphones. Instead of listening to a signal, the pilot simply has to watch a little dial instrument in the cockpit. A the unit will tell him if he is flving in the right di rection he pointer on sensitive indicator is affected by a radio beacon anywhere within 100 miles of the moving plane. Successful tests have been made with the new guide, and several of them are in use. TATTOO TO MARK PET STOCK HELPS PREVENT THEFT To identify small animals and poultry, a marker, be carried in tattoo that can the vest pocket when use, has space for one, two orthree characters at once and is so adjusted that the units cannot be put in upside down. The in strument is especially adapted to use on rabbits, calves, sheep and poultry, the not in latter being marked on the inside web the wing. An indelible ink, applied wit! the marker, insures a lasting identification AFRICAN HUNTERS “BAG” GRASS FOR U.S. FARMS To reduce the cost of raising live stocl by providing cheaper and better pasturage plant explorers of the department of agri culture have just completed a nine months’ search in African jungles, where they col lected a large number of samples of dit These will be planted in this country, to test them out under different ferent kinds of grass seed. soil and climatic con ditions in the hope that some variety may be found that will thrive, stay green jonger than the domestic kinds and be easier to raise. The collection gathered comprises about seventy-five per cent of the forage grasses that Kenya and the highlands of Tanganyika, formerly known as British and German East Africa. grow in

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POPULAR MECHANICS 897 QUAKES AT SLEEPING VOLCANO NUMBER SEVERAL IN DAY It, Lassen, America’s chief active vol- o, is sleeping, but its slumber is trou- for earthquakes are constantly oc- g near it, sometimes several in one and the peak constantly gives off uds of steam. Within 100 miles of the cano are hot beds of pumicestone and a areas which were formed within re- nt times, geologically speaking. By rrin eging off the surface of the pumice area, uch higher temperatures are recorded. H. Finch, of the geological survey, ose work is to “keep his finger on the ulse” of the sleeping volcano, is making tempts to photograph the summit and to hbtain accurate temperature measure- ents. The Indians say that a mountain ir the peak has been hot for many 1 irs, and earthquakes, with attendant ttling noises, have been observed by the One of the Porcelain Bells for a Chapel at Meissen, : ae : -¢ Rs Germany; the Figures Affect the Tuning rest service for at least fifteen years. . FORTY BELLS OF PORCELAIN GRAPHIC RECORDER OF VOICES TO STRIKE CHAPEL CHIMES AIDS LANGUAGE STUDY Instead of being cast in metal, the forty Persons of different nationalities pro- bells for chimes in a chapel at Meissen, nounce the same sounds by using their Germany, are being fashioned of porce- peech organs in different ways, and to lain. More than twenty of them are al- letermine just what the difference is, the ready completed and have been tested. niversity of Chicago employs an appa- Since each has different decorations, it re tus that makes a graphic picture in wav- quires special tuning. This is done by g lines, of the sound as pronounced. As_ grinding. The bells are to be suspended he breath is expended, the lips moved and _ by stout straps. Other details of the ther processes in speech performed, the chapel are to be made of porcelain. Amon; result is recorded on a moving cylinder. them are a number of human figures, some weighing as much as 000 pounds MAGNETIC PENCIL FOR DOCTOR Bits of metal are re- moved from the eves and other parts of the body with a magnetic pencil of cobalt steel, one of the latest units added to the emergency kit. It is about the size of a lead pencil and has been success- fully used where an op- eration with a knife might otherwise have Making a Voice Picture to Study Speech Methods; the Sound Vibrations been necessary Are Traced in Wavy Lines on Cylinder sate de

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She Mam Omitoot Guns That Aim Themselves, Giant Electrical Ears and Fingers of Light Meet Air Menace oO of the future will be battles be- : mechanized mute electricity, almost tween wizards, masses of steel energized by seemingly endowed with human intelligence. Mammoth guns with which see the enemy many miles away, and which can hurl huge projectiles with remarkable farther than the length of a Marathon race course, add new efficiency eyes, accuracy to tomorrow’s wars. Substitute lights suns—far-sighted search- make fighting at deadly as by day. night almost as Sound recorders give notice of the rhythmic purring of enemy airplanes many miles away. Anti-aircraft Caught in the Searchlight’s Glare, the Planes Over- head Present a Target for Gunners Down Below battery formation, which and vuns, in sighted directed by electricity fired by cannoneers with wonderful accu racy despite the fact that the targets which they rushing onward at speeds of one and one shoot are speeding airplane half to two miles or more a minute. On a day in October, in the year 1415 a little army of English archers wait: behind its improvised defenses near the while a great host knights rode clanking towa1 Nothing short of seemed to be in store for the English, f what could all but unarmored foot soldiet village of Agincourt, French them. annihilatior do against mailed men on horseback? But

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1 not ste Ot neavy hev merely | selected | teel-tippe | shafts. ¢ P ehntiest corpse of ¢ e superiority of the n ‘ et he icceeding centur e le 1 of Agine re ke upon c $ , ened me ba na ne eu tee ot flesh but oO mn to round | ise 1 dragon with wings. ip CaValTy looked to then the best And, ill—the mou! nail to discuss the ae alii IIS of thei at the end, ped dead, there lay invisible tradition 1 1 OT PDC emp ut ] ‘ ] ou The man on horsebac! ited not ( the air, in true knightly stvle:; e\ nd ruined cities, they tore ne ve the treetops and lashed ! t it the men on foot beneat em t veapons the old knights had er dre ed of—machine guns or] osive bombs, clouds of chol 1 ney smoke, The m uld improvise, but, for fire the war-time ingle machine guns Since the armi tice, the ck with such w ‘ ing ga ~ ~ en on foot tried eCapons the mo st part petween the man on foot plane who slic eeded t] . ‘ n , rce bacl ha ryone on here i ] e ho cla m col rete rel ( I the man in the plane ls that nothing s left for the man o1 e ¢ ul put the ] ‘ pertween surre ( hila tion. Thev are oppe secl by those ho de clare that the planes, though m re still in a measure subject to the limitations of all highly | ( yrce t thev have considerable st ing force but no ng Owe d that t ] re ey gain in the fi ! he furthe eX] ited | ts ed the ywer-moving | | tl ee a chance for th last 1 , haft is b no me ent IL ve the crude nti- rc! It ¢ ) ( the \\ rid Va The point ere ri¢ t make ne p ¢ kee r { ude 1 ‘ 7 , en tiie e { ete in j 1 | t \ ce ni ( | tech } ue oO reratt ete ] ‘ le ; ke + ) ] the r 1) : . tru n 1 n So it ome o pass that one of th t airplane fleet } ( f ) } { ‘ " ream ng about me ¢ ish to de t ct \ urt ot t Lak 9g ttle i ¢ ¢ ( cus ms of het el ¢ on , ft und ' ’ in cf e et ect e + ‘ ut ] : seening more succe u LO! I

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900 POPULAR MECHANICS - My it has already begun to be a legend oF Ki newspaper accounts have attributed a most miraculous powers toit. One wide! circulated story declared that it picks up the sound of the approaching plane and automatically trains the gun on it, with out the intervention of any human direc tion at all. This is a little too much of a good thing but even the sober facts are remarkable enough. Manned by a few competent op erators, the machine really will automati cally compute all the firing data necessar) for the handling of a battery attacking a target at any range and altitude The operation of the instrument i simple enough in itself; the compli cated parts of the business are all me chanical and have been taken care oi in advance by the ingenious inventor who constructed it Two observers keep laboratory and shop and on the proving grounds, the army is constantly work- ing to improve ex- isting weapons and to devise new ones wherewith the man on foot may defend himself against the riders of the air. The outstanding difficulty with ground defense against aircraft dur- ing the war, and in- deed until within the last few months, was the difficulty of telescopic eyepieces i " \ getting the fire of the high-angle guns any- where near the target. Marking down a horseman with a clothyard shaft at four- score paces is a simple problem as com- pared with potting a plane high up among the clouds at a hundred times that distance. The archer had it a great deal easier than the “archie.” The practical solution of this problem, enabling the commander of an anti-air- craft battery to train all of his guns as a unit on a single target, is the greatest ac- complishment of the ordnance depart- ment, greater even than the development of the several excellent guns and mounts which have become the standards for our land defenses against attack from the air. The new fire-control instrument for anti- aircraft guns (it hasn’t received a compact name as yet) is the sensation of the day Portable Searchlight, Top; Sixty-Inch Aluminum-Alloy “ anat ner eee ; Iti 1 th; Casting for the Light, and, Below, the Army’s New among artillery experts. It is so good that Anti-Aircraft Gun

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POPULAR MECHANICS 901 ttery of Four Machine Guns, with ater-Cooled Jackets, and, in the kground, a Range Finder; the ir Browning Guns Fire at the Rate of 2,000 Shots a Minute One ot ined on the attacking plane. follows all horizontal movements, nd the other all risings and fallings of he target. The internal mechanisms in hich these telescopes are mounted ac- them tuate indicators on dials, from which the data may be read off directly. Factors other han those of horizontal and vertical posi tion, such as timing of the shell fuse, etc., re “fed in” by other operators at appro priate dials. lhe firing data can be transmitted to the guns in any one of three ways. The sim- Jest method consists merely in telephon ing the figures to the gun pointers, who hen lay their weapons in the usual man ner. The second method is what is called he “tollow-the-pointer” system. Data dials similar to those on the fire-control instrument itself are located at the guns, th pointers that synchronously with those of the control instrument. The task of the gunners then is to operate their handwheels so that a second pointer on each dial follows faithfully the movements of the first. The more nearly perfect they this following of the pointer, the more accurate is the training + \" move are able to make of the guns. The third system, which is the real sen- sation maker, is entirely automatic in its operation. Electrical connections run from the fire-control eun in the battery, applying the mechani- cally computed data by means of motors veared to the training mechanism of the guns. The fuse which time the burst of the projectiles, identical same device. It is an instrument to each setters, are also held to settings for all the guns by the uncanny wholly deserted by sight to see a battery of guns, muzzles their crews, following with thet every movement of a speeding target in the clouds, almost were alive. Chis automatic method work of training the guns in t | of the battery commander, and as if they places the whole he hands eaves the vun crews nothing to do but shove the noses of their projectiles into the fuse setters for a moment, slam them into the breeches of their pieces and pull the lan vards. This makes tor very rapid and un interrupted fire. The automatic training of all the guns in a batterv—which can, if desired, be ex tended to all the guns in any number of batteries—is probably at the bottom of the extravagant stories about the superhuman powers of the new fire-control instrument. One other factor has probably contributed

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902 POPULAR MECHANICS to the spread of the reports. For picking up approaching planes at night, a listening instrument is the main reliance of the fire-control detail. This looks like four huge loud-speaker horns, all pointed in the same direction, with ear tubes like an ex- aggerated stethoscope attached at their lower ends. When the listener hears the roar of the motor at its loudest, the in- strument is pointed approximately at the approaching plane, and the position, trans- mitted electrically to the waiting search- lights, is at once stabbed by their beams. \ little feeling around by these huge an- tenne of light, and the target flashes into view. Then, but not until then, do the observers at the fire-control instrument go to work. But this is far from training the guns directly on the target merely by picking up the sound of the motor. Position find- ing by sound alone, even on a much less delicate footing than this, is not practica- ble, because sound does not proceed in straight lines qs light does, but is subject to change of intensity and apparent direc- tion by winds, lavers of air of differing density and temperature, clouds and ot} reflecting surfaces, and a number of othe factors. At best, the auditory positior finder can only approximately locate target. Within its limits it is a great hel to the searchlights. But a performer military miracles it certainly is not. There are several weapons specially de signed for attack on aircraft, each ver worthy and well adapted for its own par ticular purpose. The backbone of the anti-aircraft service is the new three-inc] high-angle gun. This is the type of weapor now being installed for the protection ot} the locks and harbor works at Panama It can throw a fifteen-pound projectile t a height of 10,000 vards and has an ex treme horizontal range of 15,000 yards. A rate of fire of twenty-eight shots per min ute has been attained with this weapor That means that a battery of four of thes: pieces could hurl at an enemy plane near) a ton of steel and high explosive in a burst of fire lasting one minute. During th past year the improvements in this piece and its control have made possible a dou bling of the hits scored, in half the forme: time and at twice the former r, ss Oe a de fiase ~ + ° ey, Woe. € range, concisely, an 800-per-cent increase in efficiency. The three-inch anti-aircraft cannon has a formidable big brother in the new 105-millimeter, or 4.l-inch, high-angle rifle, a very long-barreled, powerful weapon that can throw its thirty-three pound projectile to a height of 12,000 yards and an extreme range of 19,000 yards, or over ten miles. It is a slower-speaking piece than the three-inch, firing only fifteen | times a minute, but the greater weight and range of its projectiles more than even up the score. Because of the great length and considerable weight of the fixed ammunition for this gun, the op- erations of loading and of eject- ing the empty cartridge case after firing have been made almost en- tirely automatic. The three-inch gun is semi-automatic; that is, its breech block is snapped home by a strong spring as the cartridge The Ears of the Anti-Aircraft Gunners Are This Battery of Super- Sensitive Sound Collectors slides into the chamber, but after firing, the breech has to be opened

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POPULAR MECHANICS 903 Anti-Aircraft Guns Which Aim Themselves, Being Tested at Aberdeen Proving Ground; a Sensitive Sound Pick-Up Points the Weapon Directly at the Source of the Sound cannoneers. The breech the 105-millimeter piece, however, is too heavy to be operated inually at the necessary speed without out ‘the cannoneer in a few Accordingly, the long cartridge laid in a tray extending backward from he breech and a pneumatic rammer shoves home. As it clears the breech block, the projecting rim at its base trips a trig- er, which allows the spring-pulled block to slide up into place and finish seating the cartridge. The gun is now ready to ire. When it is fired, the force of the recoil is utilized by means of an ingenious cam arrangement to open the breech block ind eject the empty cartridge case, and ilso to return the pneumatic rammer to compression position, ready to load an- ther charge into the chamber. The ammunition in these two guns rep- resents a great advance over that used during the war. Then, because of the un- reliability of time fuses, shrapnel was usu- ily employed. This type of projectile fills the air with a shower of leaden pellets, one of the echanism of earing unds. shotgun fashion, and is an ideal weapon against infantry or other scattered targets. But it isn't so good against a narrow target like an airplane, for it was practically nec- essary to score a hit on the aviator himself in order to bring down the plane. Nowadays a high-explosive shell is used, for post-war development in time fuses has made it possible to make sure of bursts within fifty vards of the target. At this distance the aviator is exposed not only to the flying splinters but to the stunning concussion caused by the explosion, which may cause him to lose consciousness for a few fatal seconds. A third gun which has been developed for anti-aircraft work is perhaps the most vicious-seeming of the whole family when it is seen in operation, though it is only a little one. This is the thirty-seven-milli- meter rifle, an automatic. It shells weighing about one pound at the rate of ninety shots per gun per minute. fires During night firing, when tracer ammunition is used, the trajectory can be seen drawn against the dark like a fiery dotted line.

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904 The Brain of the Automatically Pointed Gun Is This Instrument, Which Locates the Plane and Directs the Weapon The light shells of the thirty-seven-milli- meter gun differ from those of its larger brothers in that they are designed to burst That is, a shell actually has to hit a plane before it can explode. fect is ruinous. on contact instead of by a time fuse. the ef- Half a wing, or the whole of the rudder apparatus, simply vanishes. So much has been determined by trial on fabric but what happen should one of these little shells chance to hit a loaded bomb rack had better be left to the imagination. In order to function upon contact with so slight an obstacle as the fabric of an airplane wing, the fuse of this shell, of course, has to be of almost unimaginable This has means of a most ingenious The plunger that fires the de- cap poises ready to strike the moment the projectile clears the gun. But it is prevented from striking by the pres- sure of a tiny column of air admitted through a hole bored in the nose of the shell. So long as the projectile is in flight, this pressure is maintained. But if any obstacle, however slight, closes the hole for even an instant, the restraining air pressure is removed long enough for the But when it does, targets, would delicacy and quickness. been achieved by principle. tonating POPULAR MECHANICS plunger to strike ho: and detonate the ex; sive charge. Shells of 1 type, fired thunder shower, ha exploded on striki: large raindrops. through 4 These various types attack with shells are bh: adapted for the high ing planes—bombers observation planes. |] low-flying “hedge he per,” which just ski: above the tops of t trees, demoralizing c umns of troops and ruit ing transport trains w machine-gun light bombs plante neatly in rows, is difficult to find with weapons large as these. comparatively agile t ty-seven-millimeter aut matic is hardly enough on the turn to catch these fiye: Yet they have to be met, for all armi fire at Even th 1 } qui now have planes designed especially for this very type of combat. One of the ne Curtiss planes, for example, carries thre machine guns pointing forward and on in the rear cockpit for the observer, be sides racks for a large number of lig! bombs. Most of these ground-attac!] planes, moreover, carry light armor arou! the cockpit, to protect the crew and the vital machinery from ordinary fire. this nut, the .50-caliber ma chine gun has been developed. It is the same in general construction as the .30 To crack caliber Browning heavy machine gun, ex cept that it throws a massive cigar-shape bullet, half an inch in diameter and weigh ing two The light plates an airplane is able to carry cannot deny entrance to such messengers as these, and what they hit they break, about ounces. steel whether it be an engine valve or a steering control or human flesh and bone. To make mat- ters doubiy sure, a mount has been de vised by which four of these guns can be trained on the same target by a single gunner. This quadruple weapon delivers two-ounce slugs at a rate of thirty a second —a veritable hurricane of death.

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POPULAR MECHANICS 905 so the man on foot stands again he stood on the morning of Agin- Whether he can prevail against ivalry that may ride to oppose him, in is now able to say. He himself no boast. He only looks to his ring. and picks out the best of his teel-tipped hafts. MATTRESS OF RUBBER TUBES IS EASILY CARRIED lled into a small package of little ht when not in use, an inflated mat- of rubber tubes has been western physician. There are twelve each in a cloth case and with a e for inflating. The casing is wash- The entire mattress weighs but a pounds and, since it can be carried mall space, is particularly adapted to ping and automobile trips. devised AUTO THAT FLIES ALSO SERVES AS FAST MOTORBOAT ourists of the future will be able to conveyance for travel by air if a British craft, re- tly exhibited, proves successful. It is mbination automobile, motorboat and lane, with wings that fold back, tail rudder and two propellers. A _ shel- ed cabin holds several passengers and tle time is needed to change the vehicle different modes of travel. the same water or COIN-IN-SLOT BASEBALL GAME TESTS PLAYERS’ SKILL Young Woman Is Manipulating the Bat. Man at Her Left Is the Pitcher; Scoreboard at Far Corner Many of the thrills of a real baseball game are afforded in a coin-in-the-slot playing cabinet which permits two per- sons to enjoy five innings at a time, and also keeps accurate score of the runs, hits and batting averages. One player acts as pitcher, delivering the balls—small steel spheres—from a slot on the field by turn- ing a crank. His opponent, as batsman, turns a handle which swings a small steel bat, mounted on a pivot. As the balls are struck, they roll into compartments at the rear of the field or drop into holes with the result that miniature men pop up from the home plate and are carried along for one, two or three-base bs hits or homeruns, ac the where the ball This cording to place landed. action is obtained by an arrangement of and the cabinet. automatically gears levers inside Scores are registered on a board is made. as each play Since positions that will bring in runs or result in hits are marked, the batter has a chance to exercise his skill in en- deavoring to send the ball into the The operated by electric cur winning areas. machine is tr Travel by Land, Air or Water; the Vehicle That Combines in One a - Plane, Auto and Motorboat rent Irom a wall socket

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906 POPULAR It Will Tip But Won’t Fall Over; the Specially Sus- pended Baby Carriage at a Steep Angle BABY CARRIAGE WON’T TIP OVER WHILE CROSSING CURB Securely suspended from a frame of springs instead of by straps, a perambu- lator is so balanced that it is not likely to be tipped on end while going over street curbs or similar obstacles. The body is deep and sate and the entire ve- constructed. At an exhibi- tion in London, tests were staged to show hicle durably how caretully it has been designed. FIREPROOF AIRPLANE DOPE INVENTED BY STUDENT Coating the airplane wings with special materials to make them stronger and proof against moisture | added ad vantage with a sub las an stance recently de veloped by an avia student in In | diana. His prepara- tion tion is claimed to be fireproof so that the wings are prt tected against both | | fire and water. Ex | MECHANICS X-RAY “FINGERPRINTS” OF ROCKS TO AID INDUSTRY By preparing thin sections of and taking X-ray photographs of ther scientists of the University of Wisc have compiled an interesting librar mineral and other “fingerprints,” to i More than 6 now * tify different specimens. include According to Prof. A N. Winchell everything solid is ct line, and every crystal of the same kit mineral substances produces its own cl acteristic autograph. By of these “autographs” are in the collection. comparing photo of an unknown specimen with known substance, identificatio The method possibilities for of a often easily made. lieved to have great rious industries. For instance, if a ple of graphite paint to be used in venting rust, is more shale of contall X-rav posure would reveal the true compositi although and outward suspected than graphite, an shale graphite are 1 alike in appearance. The reveal that a diamond is formed of cl packed carbon. Graphite is also carl but loosely packed and of different tern. Examination of cement, ores, and porcelain products can be accurat made by the X-ray system. PLIERS WITH PARALLEL JAWS GET PERFECT GRIP Pliers which adjust themselves to object within their range, while keep the jaws parallel to provide a perfect gri have been invented by a Chicago man a are now on the market. Instead of put ting the strain on the connecting pi the new pliers p1 vide a double fi crum between t lugs. With t jaws parallel, th can hold a piece pipe as perfectly a pipe wrench. pawl is provide which swung ¢aa dD aside, « dropped into plac have been successful, acting tests Parallel-Jaw Pliers Employing Double Fulcrum to In- crease Gripping Pressure to adjust the jav for small work.

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. lgers of the By RENE BACHE \ ONG the most ferocious of creatures . prey are numbered many insects. hat class spiders are, of course, con- us. But the huge spiders called ta- las are in turn preved upon by an known in our own southwest as rantula killer. e tarantulas are trapdoor spiders. spin no webs, relving upon their th and agility for the capture of s, the latter including an occasional e or ground-nesting bird, and their ; are burrows, usually in the side of bank, lined with silk. The door tarantula house is set on a strong n spring, and shuts with a snap when the owner has entered or comes out. At home, the tarantula is per- fectly safe, the entrance of its bur- row being so artfully camouflaged as to escape even scrutinizing ob- servation. But on its walks abroad, the giant spider is always in danger of attack by the killer, which is a species of wasp. Against the wasp it has no ade- quate means of defense. Con- stantly turning this way and that to face the enemy, it is inevitably taken sooner or later, in flank or rear, stabbed with the killer's en- venomed lance and paralyzed. The duel invariably ends with the death or total disablement of the tarantula, in whose body the killer lays its eggs, in order that the baby wasps, when they are hatched, shall have food to eat. Among the most famous of in- sects of prey are the driver ants of int Water Bug Attacking a Frog, and, Above, Two Collectors tropical Atrica. Chey have no per- ming down the Mountain with Sacks Filled with Ladybugs Which Destroy the Parasites of Cantaloupe Vines manent homes, but are continually

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908 POPULAR MECHANICS never gets beyond the status of a loathly worm. The grubs, very hairy, many clawed and with powerful jaws, ha most uninviting appearance. In Java and other islands of the M archipelago there is a kind of manti which imitates a beautiful flower. Perched in the center of a flower cluster, it appea to be part of the latter. But woe to the butterfly or other unsuspecting insect that alights upon the cluster, for it will be instantly grabbed and eaten. On the ty- ground, the mant exactly resembles fallen blossom an orchid. “Ladybird, lad bird,fly a home!” What ot! insect is so e1 shrined in folklor How innocent that pretty litt beetle — seemingly) Yet, in reality, it a fierce creature on the march in armies numbering countless millions, which are system- atically organized prey, its princi food being the and seemingly dis- ciplined. All living creatures flee be- fore them, includ- ing elephants and other beasts of the jungle. Any human being who did not do the same, would be quickly destroyed, his skeleton picked clean. Monster snakes found gorged and torpid are devoured. Yet there is one exception. These fierce ants are themselves followed and preyed upon by an insect called the Bengalia fly, a trifle larger than the common bluebottle. Being always on the march, the ants are obliged to carry with them the cocoons containing their chrysalides. The flies, darting overhead, grab the chrysalides, tearing them from the jaws of the nurse workers, and bear them away for their own food. One of the most remarkable of old- world insects is the Drilus beetle, whose grubs attack and devour snails. The = adult male is. so to speak, just a regular Long-Necked Ant Lion, Top; the Tarantula Killer , - : . Center; and Three Hair-Snail Killers, Offspring of th beetle, but the female, much larger in size, Pair of Beetles in the Foreground a

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| NN POPULAR MECHANICS 909 hugs, or plant lice, o so much dam- crops and garden For that reason ted a very benefi- ect and a friend of mer. Imperial valley in nia is famous for ntaloupes, but the could hardly be there save for the of ladybugs. In men go up into igh sierras, where ttle beetles hiber- in mossy places un- the snow, usually small streams, and them up. They are nonly to be found usters, hundreds of bunched together. en thus collected, are put through e wire sieves, to get of the debris mixed ith them, and are reupon packed in and carried down the valley, sometimes he backs of mules. hey are collected in way literally by the and are placed in storage, in order t they may stay asleep | inactive until they are wanted. en the green bugs have begun to ap- ‘on the cantaloupe vines, and before have had a chance to multiply in lies, the ladybugs are sprinkled over e fields. With celerity they go after the een bugs, devouring them as fast as are hatched, with the result that the ons grow and ripen beautifully. he experimental use of ladybugs for purpose was first attempted in the perial valley, but has since been ex- nded to other parts of southern Califor- Shipments of the beetles are sent long tances, in boxes, so many thousands a box, counted by a special measuring chine which delivers them to the com- ners through a hopper. in Egypt there is an extraordinary in- | Bengalia Flies Stealing the Cocoons of Driver Ants; Warfare Is Constant and Ferocious among the Myriads of the Insect World sect called the long-necked ant lion. Its neck is considerably longer than its body, and its head is provided with two curved pincers somewhat resembling a pair of ice tongs, very strong and sharp. With this equipment the creature is able to reach far into crevices of rocks for prey. Even tually it undergoes an amazing transfor- mation, putting on wings and adopting an aerial mode of life. Most small boys are familiar with a par- ticularly horrid-looking worm, some four inches or more in length, called a hellgra mite, which is commonly found in stag- nant ponds. Eventually it transforms into a giant fly, which is familiarly known as the electric-light bug. Formerly the spe- cies was supposed to be rather rare, but the introduction of electric are lights,

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910 POPULAR MECHANICS

there is another tiger parasite somewhere ready to prey on it if the two can be brought gether, is being cay ized by the department agriculture in combat ng insect pests. As mo the pests that menace nation’s food supplie have been innocen brought in from abt the search for their p sitic enemies extends over the world. An perimental station northern Ohio is bu growing an _ import tiger insect from Europ: preparatory to turning loose on the Europe corn borer, in the fis for which congres appropriated millions When the corn-boret menace started spreadi: westward after its int duction from abr

probably in a shipme of foreign-grown broo! corn, the pest special of the government went to Europe to study tl corn borer’s habits and life on its native heat! They soon found that: ture had developed a ger parasite which live on a corn-borer diet, a quantity of parasit were rounded up at brought to the Unite States for propagation

Malaya, the Nightmare of the Insect World, Produces This Mantis, Here Seen Waiting for Its Prey to Come within Reach ; s < Che list of insect war which attract this fly in large numbers, started by the government is a long one dispelled that notion. Vast armies, like those of the lad "bug The fly in question is a vampire. Noc are marshalled each year and turned joo turnal of habit, it dives in the night into on some unsuspecting enemy of fruit ponds and streams, attacking small fishes, grain or vegetables. tadpoles and frogs. Grasping the victim In the list of the insect kingdom with its powerful legs, it sinks its beak though, there is none so perfectly orga into the flesh and such the blood. In __ ized or so well prepared for both defen some places the rearing of goldfish in and attack, as the ant. Many of the va ponds has been made almost impossible’ rieties maintain a standing army « by the depredations of this insect monster. soldiers, whose sole duty is fighting, ju The fact that for every insect and worm as the worker ants do the building a1

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POPULAR MECHANICS 911 the food supplies. When one of ve colonies of driver ants starts country, no animal is big enough to its path. They swarm over every- ind, when they have passed, the licked clean of every living thing. treams do not turn them aside, for ; of them will form in a ball, often eet or more in diameter, and launch lves on the water, with the queen ung in the center and the workers ldiers forming the outer layers. lexico, and other lands where driver re common, beds must be mounted ich leg in a can containing kerosene ‘tect the occupant from invasion he sleeps. If the moving ant army ; in the daytime, the only safe refuge ‘bed. Hans Heinz Ewers, the Ger- naturalist, who has made a life study s, met his first driver army in Mex- as chased to a chair, from there to ile top, from the table he managed ep into a washbowl of water, and the ants started forming a living e across the water to reach him, he leaped to his bed and escaped. RUBBER DISK REPLACES SPRING FOR AUTOMOBILE ‘cesstul tests with a rubber-disk ar- ement, instead of the usual metal ngs, have been conducted on automo- in London.. A car was driven forty an hour over a road of furrows and es, a foot deep, without discomfort to occupants, and the driver had no dif- in keeping the automobile in the according to reports. The spring titute consists of three parts for each eel. A serrated rubber disk, resem- ¢ a gear wheel is fitted between two tal-toothed disks, one of which is se- d to the frame and the other to the of an arm on BICYCLE THAT CLIMBS POLES ALSO SERVES AS BOAT Climbing a Pole with the Odd Bicycle That Travels on Land or Water With slight alterations, a bicycle in vented by an eastern man can be used as a climbing rig for scaling poles, or the frame may be converted into a boat by adjusting a strip of canvas and fastening it to posts. When not intended for these special uses, the outfit is pedaled in the usual way. ETHER MASK HOLDS PERFUME FOR QUICKER SLEEP By sprinkling perfume on ether masks y Sj used in operations, German surgeons are axle. Bumps d jars are ab- rbed by the rub- disk, and the of shock ab- rbers is. elimi- ed. The disks e been tested for 00 miles, show- ¢ little wear. Chief Members of the Disk Substitute for Auto Springs; the Center Part Is of Rubber reported to have spared their patient some of the unpleasant effects usually 7 attending the ad- ministering of anes- thetics. Sleep is in duced more rapidly, it is said, and the | suffocating cough ‘} is usually prevented | due to the elimina- tion of the nauseat- ing odor of this narcotic,

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912 POPULAR MECHANICS BATTLESHIP IS TURNED INTO AIRPLANE CARRIER Poe's act Fe 2 ne ee fae ce, eae ; ae 8 Suggesting a New Use for Old Battleships; Two Views of the British “Courageous,” a Former Warsh After It Had Been Converted into an Airplane Carrier \t an expense of more than $10,000,000, the British warship “Courageous” has been remodeled into an airplane carrier with landing decks and space for many planes. Six levels for repair shops and storage areas have been provided below The craft recently unde its first steam trial. the top deck. went BUMPLESS SEATS FOR AUTOS CAN BE FOLDED UP Reading a book going over moderately rough roads can be done with and comfort; it is claimed, in a spe- ease cial automobile seat recently in- troduced in France. It is mounted on strong spiral movement that normally jogs the body, and the back may springs to absorb the be folded down or adjusted over a1 of six inches. The seat may also be forward or back and raised or lowere ORIGIN OF COMMON PHRASES Few persons know that the mott America, “E Pluribus Unum,” was o1 inally taken from a poem written by Vi about 2,000 years ago, but such is the c according to authority. A resident of state of Maryland is said to have cho the phrase “In God We Trust” for Ai ican coins in 1862. It was subsequent proposed by James Pollock, director the Philadelphia mint, and, in 186+, first placed on an issue of two-cent pie “He’s a brick,” is an everyday expressi but it is not generally known that it its origin nearly 3,000 years ago, w! Lycurgus, the great Spartan was asked if it would not be advisable law Pive build a brick wall around Sparta and plied that the city already had a wall men and every man was a brick.

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POPULAR MECHANICS 913 PHOTO CELL TO GAUGE LIGHT AT NORTH.POLE nsitive that it will accurately meas- e intensity of star light and will unlight faithfully, a giant photo- cell, developed by Dr. L. R. Koller yoratories of the General Electric vy, will be used by General Nobile ‘th-pole explorations this sum- he cell is said to be 100 times more e than any of this type yet intro- nd is operated with a special re- meter, any variations in the in- daylight being registered on a aaper. The cell itself is a gas-filled even inches in diameter, coated on e with a thin layer of cesium, a extremely sensitive to light. This the thickness of just one atom. n it is can be judged when it is hat billions upon billions of atoms be confined within the head of an pit PLAYING CARDS FOR THE BLIND HAVE RAISED FIGURES ge and other games may be enjoyed Ti Sone Nungesser and Coli; Sketch of Proposed persons with a set of cards that Monument to Be Erected in France TRANSATLANTIC AIR MARTYRS TO BE HONORED | figures, so that the different values may be recognized by the of touch. In addition, a special sed hold the cards so that they To honor the memory of Nungesser and a — Coli, who were lost in an attempt to fly | from France across the Atlantic to Amer 1 on the eH ivre -CTICSS€ Ol ica, a monument is to be erecte cliffs at Etretat, not far north of | [It will be of unusual design, lil | the tiyers torming the prominent part GASKET TAPE FOR AUTOS SAVES TIME AND WORK As a substitute for cork or fiber mate ial, a roll of tape, one 1 ch wide, has been introduce l r i ] oning rasket on ous pa of the mob It sticks of tse € nating e use oO! ] ( ) Crease 4 oO 1e or o1l does not rect it 1 + f o ] | 4 | and the heat of the engine expands it Ee — | 7 - 4 4 use on Oll pans, lor instance, it 1s torn oft sed-Figure Playing Cards for the Blind; the Rack and lapped at the cornet and the lay Provides a Convenient Way for Sorting Them — fais, 5 eats Wren Abas of when screwed up, flatten out so there is no e easily sorted and kept in con- leak from the doubling of the tape. Bolt nt position for plaving. can be pushed through the fabric

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ey Stars,Rule % a ae World’s Third Largest Telescope, with a Sixty-One-Inch Mirror Cast by the Bu i Standards, Has Bee Built for Ohio Wesleyan as a Memorial to Prof. Hiram M. Per...ns By J. EARLE MILLER A GHOSTLY, luminous visitor flashed for the safety of the world, it was f out of the southern sky a few months the gases were so attenuated that t! ago, passed near the sun, and then dashed was less of them than would be found away to the south again, preceded, this the most nearly perfect vacuum ever c1 time, by its tail. ated in the laboratory. lwo hundred vears ago, or even less, So comets have been robbed of all tl the dash across the sky of Skjellerup’s terrors, but the old idea that the sta comet—tfor that was the visitor’s name— and particularly the planets of our would have been accompanied by predic- solar system, in some way affect our tions of wars or the death of kings be- and destinies, still persists. Astrolog cause, for many centuries, the arrival of a once the favorite science of the Mid visible comet always brought forth dire Ages, fell into disrepute about the time t prophecies of evil. telescope began unraveling the myst?ry The perfection of the telescope robbed the universe, but in recent years it | comets of their terror for the supersti- showna tendency of coming back. tious, but fears were roused again by pre- While its advocates are fond of referr dictions of what would happen if the earth to star predictions as an exact science, should ever pass through the supposedly one has ever yet produced proof to suy deadly gases of a comet’s tail. Along came port any of the claims made for it. \ the spectroscope, and the gases were ana- an astronomer what he thinks of ast1 ly zed. strange to relate, the idea that they ogy, and the answer, according to } might be of deadly tvpe proved true, but, Edwin B. Frost, director of the famo +

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Dese observatory, can be given in one contempt. eranting that the moon, the sun sibly, the planets combine to exert ional pull that produces the he sea and, undoubtedly, similar the earth’s atmosphere, though light in their effects to ured, there is no further evidence, to astronomers, that the stars ter are too s influence on the earth or on department of agriculture’ has he old superstitions about g¢ crops in the dark of the moon rming any other farm tasks at lar times during the moon's phases. hat fact, they keep. bobbing up intervals. “, Just recently an in suggested -that one’s hair be cut onPeTAy the’time of a new because hafWas growing best and ll of “sap” & ~ the full moon. ted, as his evic;aite, the alleged fact mushrooms and plants grow best ¢ the full moon, though science long proved there wasn’t enough moon- reaching the earth to have any effect rowing things. The Discovery of the Telescope, from an Old Print; the Dutch, It Is Generally Agreed, Built the First Refract- ing Instruments of This Kind The basic idea of astrology—that the position of the stars and planets at the moment of one’s birth will dictate the course of one’s entire life—has one fatal weakness, from the astronomer’s point of ight and the stars in certain formations are to aftect view. For, if the astrologer is rig the life of a person born at that moment, then it must be some other person than the one whose horoscope is being cast, for the stars and planets were not in their ap- parent relationship at that moment, and never could be. If one’s future is to be dictated by the position of some fairly close planet, Mercury tor example, in re- lation to distant stars at the moment of of the Zodiac, the Ancient Superstition Which Tear 1 eee? , ger Forms the Basis for All! Astrology Today rth, the app irent, visible relation hip 1s

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POPULAR ME¢ HANICS APPARENT POSITION OF STAR cation, tor ¢ ple n the WHEN LIGHT REACHES EARTH , ra arhgg ee Rae os i ACTUAL POSITION se reese ere OF STAR WHICH HAS pr MOVED A THOUSAND the rs 1 YEARS ON IT's JOURNEY THROUGH SPACE Ce

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POPULAR MECHANICS it there have grown up more ns, perhaps, than all the rest of of history can boast, except et of 1680. which Halley also ob | wrote about. The 1680 visitor e when Halley, through a calculations, announced it return at intervals of about 575 An English minister, named Whi reupon produced a book call | eory of the Earth,” in whicl i ‘ the comet, he sought to ’ 1 1 1 ¢ ) ii records ofr the doo! ' ] 1¢ 1 | \\ cyt neg hac] ward from 1680 | H eV — KS —— eae ——_—_ — supermini ~ p te — ee - ~ e == —« Tr w , 2 Fa A > ashe i he Ww $ Mc I t >t rT Comet hree f il ( I —- Ete eee ere eee! | Its Appearance Ab +1 iF 4 x : bh OOO TT Halle Come 684 A t =; D 2 Draw t clin 24> " » “ee ~~ > € € bt + ; ‘ “2° eats, 03 Ce . a Pu Wiese: ¢ A. D., fi Zoe +) e Bave Tapes ls i é to Dd F34] { ‘ : 1 } . I > f ) é ( IX ¢ ] ( yy é ( r ‘ ect ¢t t ‘ e l r i 77 ; \ ) inate é 7 TT te tr ¢ ) ( eT l¢ {) e ‘ 1) j ape I A OS+ e tiie i ) 1 | ( eft ¢ Cc { ) t V« ¢ | ( e ) ) ne ‘ \ ( ere ce , the k Halle | c | | ¢ I t ; F to the Cais t 1 ( ( ) ( i T wr ( t ‘ 742 +2 1 - = o= Ve 140 >. ("ly \\ 1 ec] e ¢ ) é ' ir) the retour? ' sC € raphed at Yerkes Observatory the comet Ty thy meantime Latest . 1910; a Striking Contrast ‘ * “> . . . . | a ? “7 . } ‘ > Child ns of the Earlier Dates in

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O18 POPULAR MECHANICS

| e ce C! pt Or OT t e H] lle, cr et 1 ite ‘ ervations COVe!T _ ms / ,

ter; at Right, Diagram Net Showing How the Tail of ’ . a Comet Always Points ig — ae: Away from the Sur THE TAIL OF A (,reel f (

COMET ALWAYS ‘ / POINTS AWAY FROM \ Z comets to he Said THE SUN, SO, AS THE iets war : lont ( BODY APPROACHES suNO \ a a ' teady ficurit c t THE SUN THE TAIL } treamet! Amst 1S BEHIND IT, BUT 1 . vas tound the at- AS IT RECEDES THE Y 4 the name of t - : . ? TAIL 1S AHEAD 1 ‘ nd saturn, eacl = eee =N cl anged to 1 time the comet had this 1s re tt; \ massed near them Py th nomer, tor during the pre 1iou \ follow the 15 ‘ \ if Mnciey to retare nie — . ut twenty nd fixed Ay is. 17359 the e oft its perihelion 1 ore hen it ould reach the nearest point to e sun nd again start the long journey out into pace bevond teles¢ pi nee | On Christmas night, 1758 Bavarian ¢ and 17 teurt tronomnye \ | ¢ comet, and on March 12, 1759, just +] 1 1 SE Grae, a en - month and a day inside the ¢ Cuiations, 1 passed perihelion, and Halley's theory had ° | proved itself. In the long history ot the Halley comet t has been associated in superstition with the death of the Emperor Augustus. as result of its appearance in 12 B, ( it! the destructi of Jerusale the Em peror | u VC CAUSE it appeared in 66 \ 1) horth perore the Te \ R t] the Ne I in ci nque¢ I of | | id hen T f ec] nN 1 66 (| t] 1 , other famous ever In the ye 837, the Comet as It Appeared at Yerkes Observat ‘ “ ( ?2 191] Then the T; ad Taken the } Chinese astronome M tuat 1" rote 23 J . W er 1¢ Tail Had Take € a Number of Beautifully Delicate Streamers

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POPULAR MECHANICS te be “a 4 peeaenite | ntually nt Egyptian Conception of the Universe Was a Vast Canopy, Resting on Lofty Mountain Height and Supporting the Stars, Hung from the Heavens like Chandeliers The the tail is always on the ind at others precedes it. the comet opposite to the sun. comet of 1680, which Halley erro- visitor, estimated as a 5/5-year on that basis, have been the one ppeared just after Julius Czsar’s but, as it was later found the one Halley had never before | recorded history, the visitor that een seen uch awe over the Romans must | ave ler comet. fine comet, visible to the naked eye, ired in 1769, shortly before the birth poleon, and proved to have an orbit vould bring it 2 000 Napoleon's life was associated by back again in uperstitious several comets. with re was one that reached its perihelion Moscow forced into the retreat that led the Little Corporal to exile ight the burning of French 11 army ba, and he was leading his troops on another appeared in the sky the -h to Paris to found the short-lived | empire. comet in 1264 was associated with the battle of Lewes and another, in 1556 appeared about the time of the abdication of the Emperor Charles V and is asso ciated also with the death of Pope Urban IV. It is possible that the two were the same one, on successive visit >, but it I tiled to appear in 1858, when it | 1 , San ES aa —s . een due again. Chinese records are . ; for the belief, how ever, that of 1264 and 1556 were one comet, for the period then ould check with a comet listed in the Chinese annals in 975, 083 a the year 104 Comets that fail to return en € pected, ind in fact, that never ippeat iwain, are not unknow1 One tound b Montaigne, at | oges n 1772 is ob served later bv Pon . a 18 5: B ela i] B hemia. in 1826, and by others in 1832. It orbit was calculated at six and a half vea In 1839, it was not seen, but in 1845 it appeared, split in two parts. Both part ] returned in since then . 1 Novet ber. no 1852, and heen seen again Eve —_ | saeth ¢ ' ee he cr eve! the ea passes throug the 0 here th comet iv have d ippeared 1 1 there i nine | mer ot nerteo Té

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POPULAR MECH ANTICS 1 ’ ' ! ta ‘ thre r Oor cle ¢ to the « t ange + + + +} + + ] ( ( ) CC ( ( n be ke t t ‘ ; + 1 e ¢ 1¢ ve f r r inset ne ist hetfore 1] p r e secy et ( \ucust n the ore ot one tronome ] + + + + 4 ih ‘ ‘ é é é f f a) | é ¢ ‘ 1 ( OSE t dust ett comet en near the 11 oO sul € ar (7 ( } OccUDpY re the tave te Inting time 4 4 | 7 , 7 PF e Phe ite |] Barnard. « Yerkes ri { ] reat 1 found - ; ( i ¢ © De CO ¢ ttoOry ( | neteen ne one 1 7 1 1 ) ere S observe ave believed they ne | ifetime. He won a $200 ‘ ‘ , ] f | +] ‘ ( r € ¢ ( é ‘ DY " é ’ ele + othe t r ( etiect 1¢ t Stat tor first « e on the tr ’ } hit +1 17 ] Tr +} ; ; ri €e 1 ¢ ¢ ] ( ln i l eC er r 1 é | Tt 71 } 7 , 1 1 1 , 1 e¢ ( eve en ¢ ne the on AOMe, the proceeded to find ¢ ‘ 1 4 1 1 f f o the 1 erial of hich ore to n f complete th, r ; ] ly { { ] ¢ e « Ose IST De a oO | en é ( met nouse + ri ] ; 1} ] | €1 “ ( é ive | ome iven t mer r\ Irie ( t tans t P 1 7 1 ( ¢ l © a muititude ot them Ome Nas! ¢ enn 1 1 1 ( ome rine c ¢ timost exclu ¢ ost the comet Ound ¢ ¢ tery ‘ ’ eT the roe] ‘ the nu er trequent , , 1 r t r e too bu th the re re. are » f t t e ) b ( nl 117 ; ; ¢ \ 1 ( e o1 equire e to i telescons \\ one ce t t i e cle ite pl ce Te leé cope ¢ t te ere } é ¢ ( ‘ OT Cc inche ‘ ure five b t one { {

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POPULAR MECHANICS 921 POWER, LIGHT AND HEAT SENT OUT BY RADIO TUBE nteresting phe- pose tor oO! ena were ab- die \ 1 r —— erved inthe labora- ced 11 ¢ ies of the General tube s hung ectric company ( the end ot ecently while ex- rece ce, 7 perimenting with a allel to the 1 ev high-pow er i Yr ael | | T¢ ort-wave radio- 1 € t began ransmitting tube, to ste i exal ipable of radiating natio OW € 1 rom ten to fifteen | ree thie kilowatts of high oug cooked the equene requencyv energy 1 ; 79 ’ Left, Transmitting Tube; Right, Lighting 250-Watt ; \ , wrrent : apple | pout hilty times as Lamp; Bottom, Standing Arc, Two Feet High Curr’ ‘ much as has been baked to the possible with previous units of this kind. core, eggs were tried at cookie ere \n incandescent lamp, pulled from its baked. One ot the most striking effect carton for the first time, lighted to full was the production of beautiful greet laney without wires or sockets when ite arcs, a foot or more hig] en the exposed near the tube; a copper bar, ls radiating aerial was touched et ng on the floor, blistered the hand that tipped pole. When the pole is remove picked it up, although the metal was cold; the are re ne ke a ime of fire neon tube suddenly glowed when merely sputtering and sending out molten coppe touched bv a spectator. Meters and other n all directions until bl t et nstruments, in adjacent rooms, ran wild neers declare that the tube 1 ( t and were twisted and broken so that ac ug really new in pri é ts ope curate scientific work in the vicinitv was ation marks the first time that suc mpossible. Persons coming too close to power and short ivelengths have bee the tube apparatus suddenly felt a warm combined. “No one c¢ ( edit low like that induced by stimulants, but promise 1til {i ] oon experienced increasing pain in theit said Dr. W. R. Whitne ( ( mbs and joints. Rats close to the radi researe lal | t e became gre lv animated for er @€X] 1 t be ‘

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{))) POPULAR Filling Cigar Lighter from oin-in-Slot Station Which Reduces Waste CIGAR-LIGHTER FILLING STAND RUN BY COIN IN SLOT |) ( f £2 1 a t i dl a jua tity Ol qu ullicien oO !t i cigal lighter pours out of a spout. This lighter-service tation was Paris very popular. recently introduced in tobacco shop and became MYSTERY EXPLOSIONS IN EARTH LAID TO NATURAL GAS Pockets of natural gas, forming under the earth in a district of northern Austra- lia, are thought to have caused upheavals that occurred there recently. Geologists the that the atmosphere, fo: 10 examined area noticed miles around, wa heavily loaded with the odor of petro- benzine. localities, leum and In some the smell was so strong that it was feared an unpro- might cause an explosion, tected flame Apparently, pres- sure in the pockets had increased grad- 1ally until the over- could the lying strata no longer hold MECHANICS HORNS ARE GROWN ON CATTLE IN LABORATORY TESTS Horns on animals are developed fro: the skin and, possibly, the connective ti instead of from the skull, according to Prof. W. F. Dove of the University ot Wisconsin, who has performed a numbe sues, of interesting experiments with calves a1 oats. On these voung animals, he was able to produce the solid horn of the deer, th: sheathless horn of the giraffe, the casting and sheath renewal of the prong-horne antelope and the rhinoceros type of hor which is composed almost entirely of stiff substance without a bony core. T! tests showed that the horn, when it bes to grow, can be taken from its normal sition and transplanted to a foreign gion or to another animal, where it develop. licated The experiments have any erowth except by selec tive ] { method of then, and under the most careful selecti: calves occasionally wil though 1 } i l be born with hor: generations of their forebea: were hornless. Dairy cattle without hor: are preferred because they give considet ably more milk than do the horned breed he horns use up lime and other materia! that otherwise would go largely into the production of milk DOUBLE ANIMAL TOY CIRCUS HELPS EDUCATE CHILDREN Toy animals with interchangeable bodies have been devised by a western artist to add to children’s amusement and also to .aid them in be- coming familiar with different spec Various novel combinations imens. can be made, as the wooden bodies are quickly and separated locked again. The idea of the odd “z00" was inspired by idle sketches the Jointed Toy Animals and Two of the Odd Combina- tions That May Be Formed from Them gas, and it blew out. gartist had drawn.

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Home, Sweet Home of the Future felevision, Artificial Sunlight, Pneumatic Furniture, Metal Fittings home of the future, as an architect ages it seventy vears from now he vear 2000—was exhibited, full London recently as a sunbeam e in a land of perpetual sunshine. class,” to admit the sun’s ultraviolet n fair weather, and artificial sunlight cloudy days and night use, provided permanent summer-day effect. vertible metal and pneumatic furni- re, “bunk” rooms instead of bedrooms, out somewhat like cabins, ble walls, metal steamer furniture, a profu- n of unusual electrical apparatus, a ga ve for a combination airplane-automo and, on the ga- vith folding wings, GLAZED ROOF 3500 C.P U.V.R.LAMP OVER PERGOLA CENTER OF GLAZED ROOF GARAGE winDOws ROLLER’ SHUTTER 7 i . 7 2 FOLDING WING = AEROCAR } ¥ ff G CABIN ——e i — COCKPIT RAMPS UP TQ GARAGE AND GARDEN LEVEL and Unique Materials Combined in Architect’s Vision rage root, a second-story swimming pool gardens fitted with plants in m tainers so that new floral effects could be vorked out at will, rubber-tile paths, wireless power and program recep tion masts, lights, The house, designed by R. A. Duncan, was severely plain, but its simplicity was relieved by futuristic and banks of ultraviolet flood were among the features. plants and trees, formed of boards, painted in something resembling war-time ca mou flage designs, and a system of movable wooden wind screens along the garden vall to shut off or admit the breezes ti es > | 7 1 oe aegree desired i } = Ss aanaamentl } STEEL MAST FOR { RECEIVING RADIO AND POWER sD ; PIVOTING WINDOWS I aeD ROOMS { LAMPS FOR | ILLUMINATING GARDEN — 1 COLORED RUBBER PATH

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QP4 POPULAR MECHANICS

THE RISING € FALL METAL ELEVATOR

with sbultes raise

Operating ever

METHOD OF CONSTRUC TION OF FRAMEWORK ? Outer Wall [ ROOF GARDEN | > a Foot 1S

Tele News Sheet_ an _~ ‘ a aaa - a al a

Bun with

bee ores er. , “ Refrigerator <- ~ Cupboards ¥} = . Switchboard * os . .~, ad

Folding Doors .

— a ta-glag$s ro

ING 4ATES

TYPE OF

Outer Walls 10 draught roof frame Recess wit: sound ¢neatine ressiing

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MECHANICS "LAR PORT

i KG 4 | a << £°. -

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96 POPULAR Electricity ninant y was predor very- where. A sunken garden pool and the fountain feeding it were illuminated by night from under-water lights in many colors. The queer metal beds with pneu- matic mattresses were equipped with elec- tric blankets for warmth. The study wall was lined on one side with built-in radio and loud spe ikers, a built-in television set to see the day’s events and a built-in tele- newspaper for visible radio projection of the day’s news. An electric writer, to transmit by radio similar written messages i@nting-contro panel lso were inclt led Pneumatic armchairs, with enormous inflated cushions built up in sections vere placed in the bed and living room The chairs can be de lated and tolded up into a small space when not needed Besides the main bedroom, with twin MECHANICS beds and metal furniture, there wa whole series of individual bunk roon The walls between them could be rol up, like awnings, to throw two rooms gether as one. Pivoting windows, blinds, a roof garden inclosed vitagla and walls, specially insulated and provid with an inner surface that can be eit! heated or cooled, were other features | wall was an unusual three-ply cons tion, an outer wall, an insulated sp which also contained all pipes and el wires, and the inner wall, which took place of radiators for winter heating, provided a cooling system for summer: Much of the furniture was unu The dining-room table was built in tl sections, the two side parts he ne int connected through a vstem of leve that the table could be tolded up a three-story tea cart and wheeled in f Aejetable nucrors that can . be moved teoany pes: tion ~ THE BIZARRY DECORATION j BOoAs | AD oer ss a ASP Ei WARMING BLANKET sReady for CLS THE DRESSING TABLE

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I POPULAR MECHANICS 92; tchen. The table is completely set, the centerpiece of flowers, in thi nd then folded and wheeled int room, passing through a stand door Arrived in the dining unfolded and is ready for use. des of rooms fronti1 g- ont en al d court vards folded back toa nd sunlight in good weathet he north and east sides of the house ould be exposed to winter wind bile-type rising windows, moved usual automobile window handle, re fitted in wind-proof frames. he airplane-automobile in the attac] ge, while not a practical flying ma ne, was carefully built by an airpl ner as an example of the possible 1 the future. The propelle ler, mounted he nose of a streamlined, glass-inclosed ody, was mounted on a movable shaft could be elevated ninety degrees, ce the propeller in a horizontal posi ve the car—for straight ascent as ¢ ills of the house were made of a ike substance, which is still in the perimental stage in a London labora tough, impervious to moisture capable of being cut and welded a + fhe foundations and ¢ ¢ eratures é rk of the house were of stainless ( The wall material can be colored roduced in any desired patterns. There oO y one staircase—on the outside ne between the main house wall and e attached garage and giving access to e flat roof. An automatic elevator was ed inside, the elimination of the usual rs in favor of an elevator shaft saving nsiderable space. LINK IN CHAIN SERVES AS LOCK AND RESISTS TAMPERING o afford greater protection, a chain ck now on the market is link-shaped and no shackle to ffer leverage for apart or reaking, as has t pad ) ~~ Inventor with the Trombone Flute Which Has Sliding Plunger as Substitute for Keys FLUTE PLAYED LIKE TROMBONE GIVES WIDER RANGE es eete ( ( o é ¢ ( ng e tne Cc ¢ ¢ ¢ ( e¢ T ‘ 1 ) t _ té 7 t t 1 ec ( i ¢ é 1 , 11 per O11 K€ . ( ( f , olume ne ¢ EARTH STILL BEING CREATED MYSTERY RAYS SHOW ihe proce Oot creatiol ] 1 yong O1 ne the ¢ I r ( ( ec o 1 Sp sing ti oO . e evolutiol 1°1 the opi on ¢ 1) R ert \ \l ikat 7 oted cient t oO ¢ piorec em eric ( the Cc r ( r | € € Tc 1¢ ( f t if ( te ( ( yore! ne +} eleme S 1 t ‘ | ‘ r t Ee! cent OT T é ‘ é ‘ proportion oO! é ea ri t ] - ¢ 1 ein cre er | € ¢ ¢ e ci & fav ire ¢ '.) é ( ft ry \ ¢ ( f ‘ ese j i e ce i nounceme T é 1 t ¢ r 1 ortne b ( ne eC \¢ é

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928 POPULAR MECHANICS PLAYING-CARD TILES PERMIT OUTDOOR GAMES

Close View of the Tile Cards and Holder, and Draw- ing to Show Them in Use Durable tiles that cannot blow away or easily be defaced have been introduced as playing cards, permitting games out of doors in comfort. For bridge and othe holders tiles can be arranged in proper order an , : games, re provided, so that the 1 ept in position where other players can- not see them. TOO MUCH KINDNESS KILLS FISH AQUARIUM EXPERT SAYS Overfeeding, water too changing the often and overcrowdin ] bowls, are e the among the common mistakes in caring for goldfish, an eastern aquarium authority declares. He says that many pet fish are killed by the kindness of their owners and irges that keepers remember that the pets t have nervous systems, digestive apparatus and breathing organs which demand proper treatment in order to function ef- fectively. If the water is changed sud- denly or too cold fresh water placed in 1 1 the bowl, the shock is likely to prove fatal. The water should never be heated arti and should be taken out of the bowl at a time. 7 pre 1: 1° ” Hmclaliv, as this drives out the oxvgen, part of the water he time to change > fish come to the top for air. A round bowl should be kept only h filled, as this increases the air space abo the water. In that the fish thrive properly, they must have a balan aquarium; that is, there must be sufficie water, air and oxygen for each. order STAGE AND AUDIENCE REVOLVE IN NOVEL GERMAN THEATER For more rapid changes of scene, a G man theater is being designed so that b ] the Stage and the parquet floor ; oa placed quickly in front of an entire scene. The theater building round and will contain many other no improvements FRONT AND REAR EXIT AUTOBUS TO SPEED SERVICE 1 q > 1 7 . Both the upper and lower decks o motorbus, devised by an Englishman. served by an entr: one end and at the ther, o there i less contfusi exit , load: yr - ] wetting ff . in lers!] In 1oOading and etting OTF and considerab time is saved. The vehicle can be entirely by one man if necessary, as exits from the top and from the inter of the bus are —- contt

_.

Inventor with Model of the Double-Entrance and Ex Autobus for Rapid Loading and Unloading who thus can prevent anyone from leav- ing until he has paid his fare.

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POPULAR MECHANICS 929 CRE WLESS TRAINS SPEED MAIL IN LONDON TUNNEL thirty-three cars, controlled ty from distant stations instead speed the mails underground on boxes to delivery points They run through a tunnel uring the war for the safe rage of treasures from the British Mu against air raids, as the excavation heen converted into part of the city’s iy railroad. Approximately 23,000 of mail are carried daily, saving half hour in the transit between the rail- | stations and the post office. The ie is eighty feet below the surface of treets and is six and one-half miles The trains are controlled from dis- itching “cabins” in the various subter- Views of London's Crewless Rail road Trains for the Rapid Han dling of Mails; a Control Station with Its Signal Board and Switch Levers; Close View of the Cars and Endless-Belt Conveyors That Speed Loading and Unload the System Utilizes a Tt Constructed during the War Protect Museum Treasures ranean stations. Automatic safety cut outs prevent collisions, and indicators in form the operators where the trains are when they leave the offices, and what track they will occupy on arrival. Speeds up to thirty-five miles an hour are developed. Nearly fourteen years were required to complete the underground system. @ More than 2,000,000 separately distin- guishable colors are possible for man’s use.

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a POPULAR FORTY BUNDLES TIED IN MINUTE WITH MACHINE To Save the Busy Merchant Time and Trouble; Package Tyer in Operation the Especially pted to the needs of the grocer d butcher, a package-tying outfit ; said to wrap as many as forty a minute. by hand and form com- TT 7 1 ric ci ! r r l ubme cred 78) 1 f out rit ao the id ist themselves to e tremendous pres 1 ure it great depths l a do thev withstand the r: d cl ie in pre } } . ure s thev submerge 01 An surface? se vers to these and other questions about whales and porpoises, are being sought by scientists in the belief that data gath ered 1 i\ be of Lid n elping divers to void the disastrous effects of caisson disease, the mal- ; licts workers under high pressure while 7 rking in and Like man, Ww caissons, other ailments. whales mammals lived on are : Cleaning once land. MECHANICS ev have organs and tissues corre ng to those of the human system it S nhougnt that Knowledge manne in ch they have | dapted to re in the deep ¢ plied to the benefit of divet estigate e trving to learn whale dispose oT e ¢ irbor diox cle off by the body through the lungs periods of long ubmergence, hi mechanism oO] eat] ng 1S operate to meet the conditions belo vy the of the sea. In connection with the ¢ ments on porpoises a number of , ‘ . se 4 specimens were taken W hich studied in the laboratory GENERATOR MAKES HOT SPRAY TO SPEED CLEANING cutting the grease iri washing machinery of various kind moving paint, and a wide variety lar tasks, a simple outfit that « generates a hot, high-pressure been introduced. It operate é boile nd ] hot cleaning solution under 10 pressure he ay itus func 1 most any kind of cleaning fluid ed by an operat Auto Parts with Hot Spray from Generating Unit Attached in Rea of Service Car; High Pressure Is Quickly Developed

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rt ns, with rupuious nt ls to narcotics 1 1, POPULAR MECHANICS American border, ‘t patrol inspectors id night to stem the tide of ugglers who devote themselves ing rum, narcotics and aliens into in territory. Twenty-four hours av in the vear, these armed ins of the frontier wage re against unlawful invasion, match- ts with the tireless shrewd, dangerous and outlaws who seek easv ney by breaking international barriers. 2 : rimarily organized to enforce the im- the border gglers of all contraband ranging from to human beings and from dia- ition laws, patrol en- sorts and con- ers smu everything that seems smuggling. The work of the patrol rs the Mexican and Canadian bound- and strategic peints on both sea- Is, with heavy concentration in Flor- hecause of the inviting nearness of 1 ) + [Indian ports. he smugglers are many and persistent. bootlegging of aliens has become a usiness, second only to the bootleg- ving of alcoholic merchandise In pra tical operation, the two activities travel together. Expediency and profit are th ole considerations. I mone ick ig for the purchase of liquor consignment the smugglers’ alternative is a id ot aliens—for human contraband requires no cash outlay; it pays in advance and finances the smugglers’ activities on a gen erous scale, with further payment upon safe arrival at an American stination Smugglers are of two types. the well- organized svn licates and the freebooters of less orderly method. The syndicates are businesslike and competent, with fixed rates, while the freebooters gauge their 1 charges by the customers’ ability to pay. The unorganized lugglers are given to abandoning their cargoes at isolated spots upon pretext of going for gasoline or food supplies, and they are not always careful to reach American territory before this takes place. Not infrequently the smuggler of this type drops all pretense of service and holds up his clients at the point of a strips them of their funds and leaves gun, them helplessly marooned.

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132 POPULAR MECHANICS ida alone affords field for a hundre eT —— | cates, large and small, oper ing fleets of power boats and autom Che profits of smuggling aliens are e mous. Government observ f a dozen debarred foreignet ered in Boston through the Montre vay may vield as much as Che syndicates make charges rangi high as $1,000 for safe transport, alt] the usual rates appear to be betw and $200 for each delivery. One cate is said to use twenty hig] =p sedans and touring cars 1 irrying eigners into New England a ‘r the rival at the ports of Halifax, St. Jol Quebec. In handling this problem, the Mexico is honey- ombed with the ac- ities of highly organized smug 17 I ( r syndicates. kKuropean repre ! entatives route their alien clients t ts seaports, where they are met by ents tor trans- portation to Mexico City At this point other agents for ery to those who take them to Juarez, opposite the cCitv OT Ie] Paso, or to some other point along the boundary line. At an appointed time, members of the organ- ation lead a party of aliens to a crossing point where others take them in hand and pilot them to the American side. On ar- 11 rival, still others are on hand to conduct the newcomers to rooming houses or to waiting automobiles, which take the im- migrants to inland points beyond the reach of the border patrol and place them aboard trains for their ultimate destina- tions. In some cases, representatives of the syndicate accompany the strangers as h far as St. Louis, Chicago or even New \ ork City. Similar Systematic activities are carried Some of the Trick Containers for Liquors, Top; Bea nd = ‘ : atro Pg I . a Scen O on in Canada and the West Indies. Can- Patrol in the Far Northwest, and a Scene on the Smugglers’ Trail from Mexico

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POPULAR MECHANICS ~ ww ht in Texas, an Automobile with a Double Top Was Found to Contain Dozens of Bottles of Whisky Packed Away in a Space Only a Few Inches in Depth ets, the hidden nooks in the ceil- of bravado, and started across in a ruc vestibule platforms, and the stor- boat knowna pato.” Onl ippro ts beneath dining cars. Discov- to the American shore, the office le varied hiding places afforded by n led his surrender, but he opened fire reed the smugglers to use covered on then In the ensuing exchange he is and automobiles, or to march their shot to death icross country along hidden by- The fate of the comrade caused the traveling at night and sleeping be- other lawbreakers to direct an intense fire icks and trees during the hours of at the officers across the tream he Every form of conveyance has Americans were in a badly exposed posi- employed, and now the patrol face tion on a long narrow peninsula in the yblem of smuggling bv air. Trans- bend of the river. The peninsula extended b irplane is regarded as an inevita- close to the Mexican shore. On tl 21K)- elopment because of its possibilities ecret landings. he work of the border patrol is color- a | i ind dramatic, with ex-service men as predominant element in its perform The selection of material seasoned he army, navy and marine corps 1s on the logic of physical fitness. il of the experience of the men on | duty was that which befell a group theers awaiting a band of invaders on Rio Grande. at a point where the ‘am is comparatively narrow. The un- watchers could hear the Mexicans uing as to the safety of attempting an sion. Finally one of the men patted chest with both hands, in a gesture foot strip of land the othcers were unde 4 tl crossfire from the front ind both sides for a distance of a mile as thev sought to return to the mainland at their reat Ie caping fire and going for reinforcements, the inspectors returned to find that the daring Mexicans had retrieved the body of their dead leader and had escaped to their own country. Patrol inspectors have made successful seizures of pack trains after riding as much as eighty-five miles in a single day, following the tracks of the smugglers \ favorite trick of the outlaws is to reverse the shoes on their horses to make their progress appear to lead in the opposite di ] rection. Another ruse of the smugglers ts

Page 60

POPULAR MECHANICS

17 ‘ at Van Buren, Me rving two men badges and tw cuffed “prisoner: badge wearers ex} lat thev were ec: ited States ter: for a few miles t a short cut toa C jail. The expl Vas food and e1 the rang to bri concealed in the with the make-bse captives Impersonation uncommon. One het ot a sSmugeg ins 1

rea tn man’ ( top] ed bh in D¢ le al Rouse I When halted the turned to his passe nd said Every Freight Train Entering from Mexico and Canada Is Searched by Im- “VAT AT] ; a migration Officers for Barred Aliens Well, govern do vou know ib« ut tf to cause the I | es To le ¢ tracl wl ch The rovernor! mat é ted Cel t< ye several da oO teat achie ed prise, nd was ill ed te procees | ng pieces of automobile tires instead equent investigation showed that the of shoes on the hoofs of the animals. personator had been hired because . 1 ” “aN ‘ 2 ° 7 In pat ing the border, the officers lie resemblance to the chief executive — — ee ] | P ae ] I uit to “cut the known trails of smug that the car bore a generous shipmet elers be r open country the patrol uses contraband \ sky utomobiles. In wild regions. w] ere mo Motor cars that attempt to rus tor vehicles cannot be taken, the members gates [ at patrol stations are frequent employ horses. In dense 1 itors at the frontier. At some point underbrusl where horses are barred they a8) afoot. Inspectors meet this effort by kee] Along the New England coast, the boat spiked planks in position to cause an « traffic lands aliens and contraband in iso forced halt for each car that tries to bre ara | ited cCOvVesS as far south as Long Island. In one recent case twenty-five Chinamen short work of tires and simplify capt were captured by inspectors who inter A car caught in this fashion is likely S ING through the barrier. The spikes cepted the smuggling boat on its journey have a secret compartment in the t from Newfoundland. The aliens were de- or under the floor for ce: ing contrabar ported, but three weeks later t d i ley returned On the Canadian border the use over their original route and reached Bos- ton in box cars as a sé sleighs constitutes an accepted part of tl consignment of smuggling program for aliens. Ni Westville, N. Y.,. two sleighs came i pickled fish.” alot Che wiles emploved by smugglers are one dav, loaded with passengers. | numerous. One truck entered the United first vehicle failed to halt when the ord: States by way of the international bridge was given by an inspector, and made

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POPULAR 1 the highway. Capturing the eh, the officers pursued the rrested a notorious alien smug- s in command of the expedi- iwbreaker was given a three- nce and fined $14,000, while the mer who owned the sleighs 1 $500 when he made the mistake his vehicles three or four LOCK BIGGER THAN PANAMA’S FOR DUTCH CANAL ige lock, that will dwarf even those Panama canal, is being constructed ind at the North Sea terminal of » channel that connects Amsterdam outside It will be 1,312 164 feet wide and between forty- world. fifty feet deep. There will be huge gates, each weighing 2,604,500 Phe third is kept in reserve for cy purposes. The lock will be yr use next year and is expected to uate for venerations to come in i the steadily increasing size of both ind commercial ships. DOG MODELS CENTURIES OLD FOUND IN PALESTINE models of dogs have been found expedition of the University of Palestine. The ‘lieved to be at least 3,300 vears old w that vivania in figures dogs then closely resem- ine of the modern species. Lead Dog Models Found in Palestine; the Figures Are at Least 3,300 Years Old MECHANICS 935 WEARING SUIT OF FIREWORKS PRODUCES NOVEL DISPLAY >, 4 a4 ax Donning His Suit of Fireworks; an Asbestos Garment Underneath Protects the Wearer Earning his living as a fireworks model is the somewhat hazardous calling of a young man in London. Although he is entirely covered with an asbestos suit, the task of walking around with several pounds oOo! exploding pieces attached to his person is not without its risk of burns. TELEVISION AIDED BY QUARTZ AND BETTER SCREEN ] By the use of vibrating quartz crystals, the image from made to stay more steadily on the screen instead of fluttering and drifting as com- a television machine was monly happens The crystals served to control the electric oscillation and to syn- chronize the sending and receiving units Another improved more accurately. development consists of an screen, formed gridlike electric-discharge tube, bent backward = and through which the luminescence so rapidly that, to the eve. the screen ap- pears to be brilliantly and steadily illumi- nated. Engineers declare that many im- must still be from a large forward, trav els provements made betore television becomes practical.

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936 POPULAK WU a Rudder Skeleton of One of the Huge Air Liners for Service between England and Australia ENGLAND-AUSTRALIA AIR LINE TO HAVE HUGE SHIPS lwo liners are being con- large air structed for the proposed flying route be tween England and Australia. will be fitted with every The ships modern conven- ience and aid to aerial navigation. Their the ac companying photograph of part of the tremendous size is evident from framework, showing the rudder skeleton. TREE TRUNKS SWELL AT NIGHT AND SHRINK BY DAY With the aid of an accurate measuring instrument, Dr. D. T. MacDougall, of the Carnegie Institution, has determined that the trunks of pine trees shrink in the day- time and expand at night. A reason for this 1s that during the day, when the sun is shining on the leaves or needles, evap- oration of moisture is stimulated and the needles stretched while the trifle as it attempts to relieve the tension by carrying sap up from the soil. At night, the reverse of this process With the decrease of evaporation and less tension on the water are tree is drawn inward a occurs, MECHANICS system, the trunk begins to expand intake of water through the roots chance to catch up with the outgo the leaves. The natural elasticity o{ wood comes into play and the tree back to its natural The set measuring apparatus makes a recor size. the shrinking and expansion over a a tvy-four-hour period. MAN-MADE EARTHQUAKES HEL} RAILWAY SURVEY Causing earthquakes to help the ing ofa railroad is one ot the tasks oi neers engaged in surveying the ri: way for the proposed Turkestan-Sib: railway. off under ground, and the resulting vibration Explosives are set curately traced so that the characte: the underlying strata may be detern The study is being facilitated by a spr seismograph which traces the vibrat set up by the man-made quakes on p! graphic paper COIN-IN-SLOT SHOE POLISHER GIVES BRIGHT SHINE Both shoes are shined at once in a « in-the-slot polisher that man attendant. requires no It wipes off the dust plies the polish and rubs the shoes b1 for a finishing luster, all for a nickel the operation takes less than two minu It is designed to fit hoes of any size Both Shoes Are Shined in Less Than Two Minutes in This Automatic Outfit —

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IER POPULAR MECHANICS 93 Adjusting Propeller of the ‘‘Lexington,”’ One of the Huge Navy Airplane Carriers CLEANING BIG PLANE CARRIER GIANT TASK OF THE SEA \lthough the huge airplane carriers of he United States navy are expected to ontribute greatly to the effectiveness of he fleets levy require much the same ng and attention as a battleship, and es are just as likely to impede their ogress as that of the other fighting e huge proportions of the “Lex- ngton” were emphasized recently when he vessel was brought into drvdock for eaning and painting the hull and adjust- ng the propeller. The “Lexington” and the “Saratoga” were originally designed as battle cruisers of more than 43,000 tons. ICE AT SOUTH POLE SUFFICIENT TO COVER WHOLE WORLD There is enough ice piled around the antarctic regions to cover the entire su face of the world to ‘a depth of more than 100 feet, in the opinion of Prof. W. Mein- ardus, of the University of Goettingen. He believes that ice has been accumulat- ing there for a quarter of a million years or so. If all the ice were melted, it would raise the ocean level approximately 100 leet. 1 he eight of the uge ice pack estimated at twenty quadrillion tons \ though there are eievations Ot OLAK) « 10.000 feet. Prof. Meinardus believes that | most ot tne peat consist ot ccumuilates ] ] } + 1cé€ n t t the roc ( \\ ‘ it re j seldom over 2.00 et Ove S¢ r CITY INSTALLS VANITY MIRRORS FOR PEDESTRIANS Mirrors installed at convenient places o1 the streets of Portland, Ore ith signs directing attention to ous articles « apparel, help pedesti an keep themselves neat and tidy. Chev have pro ec popular vith men as well as with wome: To Help Pedestrians Keep Neat; Wayside Mirror with Its Sign on Portland, Oreg., Street

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STUNZ BLACK Haw | + * momma —. Frank Lockhart’s Racer before His Plunge into the Ocean While Traveling Faster Than 200 Miles an Hour Building Tires to Stand Such Speed Is a Fine Art They are, say Akron, rubber capital of America, and the bureau of standards at Washington agrees. As regard the why, you can check off with and } greater speed, lower-hung = cars four-wheel brakes, last, but not least, And, as for what can be done about it, ind night, 600 every twenty-four hours; Akron and Washington are working overtime, and inventors are smaller wheels, free air. test fleets are driving day miles per car laboratories in racking their brains to improve the breed of tires and build longer life into them. But the car his personal tire problem by heeding the lessons the and the test drivers have already learned. Here they are: Lesson 1: owner himself can solve laboratories If you want to increase your average driving speed from thirty to forty- five miles an hour—a fifty-per-cent in- crease—vyou must expect your tires to last only half as long, for they will wear out twice as fast. Lesson 2:'If you want small wheels and a modish, low-hung car, the tire bill will carry “with it a twenty-two-per-cent de- crease in mileage. Lesson 3: because the If you overinflate your tires air is free and the pressure 938 high, you will get forty-five per cent les wear out of them. An automobile tire is rubber band, called the tread, rubber and fabric simply a hear built onto tube, designed to with The man tread to last as long as the sidewalls will stand up stand the air pressure within it. ufacturer tries to build enough If something happens to increase the rate of wear on the tread, all his calculations have gone wrong. And within the last three or four years much has happened to make treads wear out faster. Traffic has been speeded up everywhere, on improved country roads Tests on the road and in the laboratory show that, for every and on city streets. fifteen miles of added speed above thirty or thirty-five miles an hour, the rate of wear is doubled. In other words, at forty five miles an hour the life of a tire is halved; at sixty miles, it is halved again, or a car driven consistently at a mile a minute would wear out four sets of tires for every set required at a speed of thirty miles an hour. Greater speed means more braking and a heavier foot on the pedal, for with every increase in speed the number of emer gency stops required goes up. This is par- ticularly true since the widespread adop tion of stop-and-go lights in cities. En- gineers of the Miller Rubber company found that on tests made, speeding a car

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em Up dead stop to thirty-five hour then slowing down lead st p as quickly as pos e without locking the wheels, e tread wear per 100 miles in eased 2,500 per cent. Engineers of the Goodyear Tire pany tested a truck by run- it at thirty-five miles an coming to a dead stop wore ott ign in a little more than 100 } miles. With four heel bra .¢ on passenger cars, they found the x F = ] ] + ¢ - 1 Cal could be stopped quick : without locking the wheels, there- \ Spreadcdin’g € went ovel t ¢ entire circumterence instead «¢ acauiring flat places trom abra sion, but tire wear was just as fast. And as for Ire¢ air in the old davs, when tires were pumped uy with bacl bre iki ig to by ] ind in over}! flated tire pre bab \\ i rarity and underinflation more oO! le Ss comn Ion U nderi flat on per cent. inen came tree a from power pumps and overinfla tion followed. VW th a le Ss of fortv- five per cent in average mileage. ' i | e Sinailel vheels ha 1 brought their own troubles Pal ng three inches off the diamete > | b | 7 - of the wheel decreases the ci lesting Samples of Tire Fabric on an Abrasive Wheel, and Lock- . . cumterence ot the tire on Hine hart’s Streamlined Car, as Seen from Above

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O4() POPULAR “UMPTY THOUSAND MILES AT NORMAL PRESSURE MECHANICS have naturally looked ior gyreater life fror } their tires. But, the tire makers point out there still remain many miles of mediut poor and bad roads, and the total range ot all driving surfaces shows 500-per-cent difference in which the degree of abrasivenes causes the tire wear. Any paved than the old graded \ road of crushed rock, with it many sharp edges, is harder on tires than smooth, washed gravel from a creek bed And snow is responsible for practicall no wear. highway is better roads. A dozen years or so ago, when it was customary to lay up most cars for the winter, cold weather was popularly sup posed to be bad on ( te Goodyear Tire C Over or Underinflation, and the New Type Smaller Wheels Are Both Respon- sible for More Wear on Your Tires and a half inches, but increases its wear by twenty-two per cent, the Good- year engineers have found. The ratory their “that Miller explains tests indicate increase labo- the tires. As a matter of fact, the of lower effect tempera- ture is just the re verse, and tires will wear longer in cold weather than they will in hot. A tire could be frozen ina solid cake of ice and left for a long time without damage, for the tensile strength of vulcan- in rate of tread wear due to decrease in tire diameter is not in direct proportion but greater than the in- crease in revolutions per mile.” The rea- son is that the portion of the tire in con- tact with the road does not vary in pro- The deflected radius of a 31 by 5% tire is 15.17 inches, and that of a 28 by 51% tire is 13.88 inches. portion to the change in diameter. The larger tire makes 664.5 revo- lutions per mile and the smaller one 726— a difference of nine and a quarter per cent, which indicates an increase in tread wear on the smaller wheel of between fifteen and twenty per cent, although the smaller size will have but ten per cent more road contact in a mile. One for the greater wear of the smaller tire is the heat generated by slippage. With thousands of miles of improved roads being added to the nation’s total of paved highways each reason year, car owners Courtesy Miller Showing the Effect of Increased Speed and Higher Temperature on Tire Wear Rubber ¢ Chart

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POPULAR MECHANICS 941

ed rubber is greater at zero than it is

eventy-five or eighty-five degrees. Nor which is used in many hilly cities melt snow in the streets, hard on tires chemists have found that it does not age the rubber. e effect of temperature changes on re wear is startling. The rate of wear road temperature of 100 egrees is about five times as high at forty degrees. A chart re rding the results of tests at va- temperatures and speeds ows that in hot weather e increase in tread wear ecomes alarming at peeds above forty-five les an hour.

ke. AT Boa. TO REDUCE WIND RESISTANCE

Capt. Malcolm Campbell’s “‘Bluebird,” Present World-Record Holder; Above Is a Rear View Showing the Rudderlike Fin, to Prevent Skids, and the Pair of Radiators ot speed, between fifty-five and sixty miles Rubber company show that wear is greater in hour, cost a twenty-five-per-cent in- in dry weather than in wet, while on snow crease in tread wear. wear is practically nonexistent. Highly [here are several other causes of ex- crowned roads increase wear because they cessive wear, such as badly balanced have a tendency continually to roll the brakes, misalinement: of wheels, and the’ tire to one side, and if such a road is ncreased tire slippage at higher speeds. rough, the wear is even greater. Ina hill \s the speed goes up, there is considerably or mountainous country, where there is more swerving and more axle bounce, due’ considerable second-speed pulling and to rough spots in the road, and both of much braking going downhill, tires will these mean greater tread wear. wear out faster than on level roads Tires run on the test fleet of the Miller The importance of proper inflation

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$2 POPULAR High-Speed Movies; Top, a Cushion Tire, Clear off the Ground; Center, a Solid Tire, and, Below, a Balloon Absorbing the Shock stressed by all the manufacturers. Revolv- ing at high speed, the tire is constantly being compressed and expanded as each part under the load. This high passes lig speed flexing pre duces heat within the tire, just as a piece of metal, bent rapidly back and forth to break it, der the treatment. grows hot un- At the proper inflation point, however, the flexing is less than in ‘ither an overinflated or underinflated tire, and hence there is less internal heat. Manufacturers are experimenting with a wide variety of tread designs to permit the tread to under road without straining the tire or causing tread “oive” 1 1 SNOCKS, wear through its sidewise roll. At the bureau of standards laboratory. a tire is run back and forth under pressure MECHANICS against a sheet of thick plate glass and tl distortion oft the tread photographed the Fire in Akron, a supe stone plant, speed camera, motion mo [Instead is 1 2 - taking the usual sixteen pictures a seco Gl stopping the film an instant 1 for each @» ? posure, the Jenkins camera takes 3,2 pictures each second, and uses forty-ei lenses, revolving before a constantly m ing film, to make the exposure possible. Films taken with it show a tire actuall disintegrating under road wear, and whe the movie is run off at the speed, the tread wear can be studied analyzed. Comparative pictures of h rubber, high-pressure and balloon tit 1 SnHow on the film how the softer 1 when run over a rock or bump, give u they fit themselves around the object a absorb the shock. The movie films ha proved useful in designing tires tor . speed racing cars. British tire builders discovered m than a year ago, when building the ti for Maj. Seagrove’s “Sunbeam,” up a than 203 miles hour—recently broken by Maj. Campbe another which record of more | Englishman—that they had e1 tirely new factors to deal with. Becau the tires were to be used for a few m ments at a time only, and on comparatively soft sand at Daytona beach, Fla., quired less tread, but the they re sidewalls, o of the tire had to be considera bly strengthened to withstand the terrifi “carcass,” centrifugal forces when revolved at such high speeds. CHAIN LIFT FOR SKYLIGHTS AIDS VENTILATION Large or small skylights are eas | i 7 | i | j anna | ily raised or low ered by means of a chain wheel and co y ~ arrange- ment which is eas ily installed and securely locks the sky light so that it cannot be opened furthe from the outside. Any degree of eleva tion is attained so that proper ventilation can be had with little trouble.

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POPULAR HOOF-AND-MOUTH SERUM HELPS TO SAVE CATTLE Progress in curbing the and-mouth reported from iy as aresult of using ecial serum prepared ; (4 disease Ger- n animals which have made immune to isease by constantly ig of the Inoculation is racticed in three first is a protective treatment, merely tempo- in effect and render- | the animal immune ten days. The second simultaneously an artificial infection of irus itself, and the third is a curative in- oculation to cattle that have con- it has not Satisfactory results een ed ncreasit doses a ways. he Boat That Rolls by tne viven vitl the disease viven tracted the disease if reached an advanced stage. have been reported when the treatment administered during the earlier stages. RUBBISH WAGON IS INCLOSED TO PREVENT DUST cleanliness in handling rubbish is possible in Potsdam as the re ult of the introduction of a special truck (;reater street body is in the form of a cylinder. The small containers emptied into it through a rear opening and, when the truck itself is dumped, the load pours out through the bottom. The arrangement also prevents spread of unpleasant odors. Filling Rubbish Wagon Which Traps Most of the Dust and Odors it are MECHANICS on Water with Motor Attached; the Idea Was Inspired Seeing Two Tin Cans Floating in a Stream BOAT THAT ROLLS ON WATER LATEST IN MOTOR CRAFT From seeing empty tin cans roll along on the surface of the water, a southern in- ventor obtained the idea for a novel motor craft. It consists chiefly of two galva nized-iron drums on axles with an out board motor between the two cylinders While the outfit does not develop great speed, it is unsinkable and will support considerable weight. DYNAMITE DUST CURES OATS OF SMUT DISEASE As a substitute for more laborious processes, a dynamite-dust treatment is being given oats to eradicate smut, one of the most destructive of the diseases that attack the grain. The infusorial earth, a used dust is base in dynamite manufacturing. Being po- rous and dry, it absorbs the formaldehyde solution that kill the fungus spores, carrying the to used smut poison through the grain when mixed with the oats. rhe dust is also treated with iodine vapor to kill the pest. It cleans the grain at a cost of less than five cents a bushel.

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944 POPULAR KIT OF PAPER SOAP AND TOWELS LATEST TRAVEL AID A Quick but Thorough Toilet with Paper Soap and Towels; the Entire Kit in Foreground One of the most recent conveniences for the auto tourist, camper or picnicker is a kit of towels and soap in paper form. It comes as a small flat package that requires little space and contains sufficient mate- The soap paper is held in the hand, water ap plied and the paper rubbed. A thick lather quickly forms and the piece is used as a wash rag would be under ordinary con- ditions. The towels are of a stout, ab- sorbent grade and may be dried and re- used if desired. rials for twelve complete washings. GOLF TEE HAS ARROW GUIDES TO AID CORRECT STANCE ee Many poor shots in golf are due to improper stance and in order to correct this dif- ficulty, a tee has been introduced that has two ar- row guides set at right angles so that the player may take his position in a more effective relation to the line of the ball’s flight. MECHANICS With the tee is ! pin, by means of which it is held secure to the ground furnished an FIRST HORSES SMALL AS CATS AND HAD FOUR TOES 1 In body and features, the first horse believed to lived about 55,000,000 embled the animal of today except that they were about th size of cats and had four toes. A cast ai the skull of one of these early specimen have years ago, closely re anda model showing the animal as it prob ably appeared in life, are on exhibit at th: Field Museum of Natural History. Th skull was found in the Wvoming “Bad Lands.” Other skulls and models are di plaved, showing that the horse gradually increased in size and had three, two an subsequently one toe or hoof as at present SILENCE SHUTTER ON PHONES PREVENTS OVERHEARING So that heard by the “aside” conversation cannot be person at the other end of the telephone, a silencer shutter has been devised for the mouthpiece. It acts a a hand does in covering the diaphragm and is moved into position simply by turning a little lever like that of a camera. shutter. The proper ad- justment is shown by the ‘speak wor d S and “si- lent” on the dia- phragm cover. POULTRY-BROODER VENTILATOR SERVES AS SMOKESTACK Designed to fit any poultry-brooder stove and to offer a protection against roof fires, a combination smokestack and ven- tilator has been introduced by a Califor- nia man. The ventilator part is of gal vanized iron, twelve inches in diameter and the brooder pipe runs through the cen- ter. A slide at the bottom of the venti- lator serves to open or close the draft. @ Leather dust is used in making fertilizer.

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POPULAR MECHANICS 945 RUBBER LIGHTER THAN CORK important uses found fora “foam” recently devel- engineers declare. iid to be one of the t known solid sub- having about surth the specific of cork. Unlike rubber, sponge has large pores, iterial is not usu- vermeable to fluids said to have ex- eat-insulating ties. It is formed by ng a special gas un- ch pressure into the compound while heing vulcanized. reservers, etc., may pared from the sub- e, it Is predicted. PRISM HELPS AUTO DRIVER SEE SIGNALS ’rivers of closed cars considerable ulty in seeing over- | traffic signals, but this obstacle is said have fe overcome by using a special prism on It is adjusted to deflect rays of the beacon into the field of the so that the driver need not out of windshield. stoop the car to see when the The unit is easily attached does not interfere with driving. lean ht changes. >) Soi istrating How the Prism on Windshield Directs Rays from Overhead Traffic Light for Drivers’ Aid Placing Tray of Insect Specimens in the Temperature Cabinet to Study Ef- fects of Hot and Cold upon Them WEATHER IS MADE TO ORDER IN WAR ON INSECTS Winter summer quickly produced in a veloped at the Massachusetts Institute ot and temperatures = ibinet de aTe testing Pechnology, to aid in the study of insect pests that damage orchard and forest trees loday, the interior of the box may be mild and pleasant in warmth. Five days later, the thermometer show thirty degrees below zero. While one observer will keeps careful record of the temperature induced, anothe places trays of the insects into the cabinet changes, artificially and, after a certain length of time, the specimens are éxamined to determine the effect of the “made-to-order” weather @Whenever you find that know more about any article in this maga zine, write our Bureau ot you wish to Information

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° TRON HORSE SNORTS By HUBERT MALKUS }' YR nearly a hundred years the steam ocomotive grew in size alone. Me 1 1y 1 : 1 11 m4 chanical it developed not at all. ihe “Old Iron Horse eot bigger but not bette Incredible as it mav seem to the age that perfected the automobile. the radio and the airplane, the “Tom Thumb” of 1830, no bigger tl in a handecar and weighing scarcely a ton, was as good a locomotive as many of the 250-ton mon- 1 sters in service today. In principle, the amusing and crude little contraption that supplanted the horse as the motive power of American railroads century ago was exactly the same as the huge steel mastodons of the present They re just boilers on wheels. gener iting steam to propel themselves and a train. fa yuilt by Peter Cooper for the Baltimore and Ohio rail- road about 1830. On a truck, the size and shape of a handear, was a small upright boiler, feeding steam to a tiny evlinder. my 1 1 The little locomotive, wood-fired, pro- ‘ ‘ a? , duced one and a half horsepower. In time | ° 1 ° 4 . the pioneer iocomotive designers laid the boiler horizontally on { specially made truck. Phe cvlinder was also pl iced hori- zontally. Appurtenances, such as the bell, . > cowcatchner and cab appeared, but none ot The Granddaddy of All Locomotives, Stephenson's ‘‘Rocket,’’ Was Just a Tall Smokestack Followed by a Small Boiler and a Pair of Oblique Cylinders, with Water in a Barrel As the demands of American traffic increased locomotives were more powertul Dy increasing the the boiler. by increasing the size anc ber of cylinders, and by adding t number of driving wheels. But mentally they were all just bis Thumbs.” For many vears the stea comotive designers were able to kee ith the rapid growth of railroad ton: simply by enlarging the scale of blueprints. But this convenient met could not last forever. There is a li 1 the size of a locomotive. The weight not be more than the rails and can safely support—400 or 500 ¢t Clearance in tunnels and cuts limits | to tourteen to sixteen feet and to nine to eleven feet. Curves in the way make it impractical to build loc tives much longer than a hundred feet. Nearly fiiteen years ago designers of steam loco- motives reached the limit of sheer size. The Bald- win locomotive works built four giant Mal let locomotives withtwenty-tour driving wheels,

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wr DEFIANCE, A Three-Cylinder Engine with the Added Cylinder Head Showing Just above the Pilot; Note the Be Wh Has Been Moved Forward Where It Can Be Heard Far Ahead

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POPULAR MECHANICS liree feet in diameter Va driven In disgrace irom ; : - tender was 106 feet in Klectric locomotives nov pu ; oe , eight 860.350 pounds. trains over the mountains, not Express, Baggage and Passengers, and Haul a Trailer or Gas-Electric Coaches, Capable of Making Sixty-Eight Miles an Hour, Are Displacir Chicago at a speed at times exceeding as big an engine as the track « eventy miles an hour, vet have a tractive would permit—but it was not bi force of only 42,000 pounds. The problem was to increase tl The Virginian railroad, which bought — capacity thout enlarging the bi ne of these huge Mallets, needed a still the designing room it is —P ssible ore powerful locomotive for mountain a locomotive of any desired speed, ervice. So, on their order, the American desired hauling power. It 1s al ocomotive company built, in 1918, the of the size and number of drivi1 lost powerful locomotive the world has and pistons. Large driving whe seen With four cylinder . two ot them erate-sized cvlinders and sho thirty inches in diameter and two four stroke make a fast passenger eet, and twenty driving wheels, this gi but one without tremendou antic Mallet developed i tractive force power. Small driving vheels, larg f 176,000 pounds. It weighed 898,000 inders and a long piston stroke ounds—nearly 450 tons heavy, slow freight locomotive. But this giant, despite its great power, That is all a matter of form is too slow. Freight trains jammed up can design a locomotive to go n both sides of the mountains like logs pull as much as you like, if at n.the spring drive. The Virginian aban- time you can design a boiler that wi "1 loned its steam giant, cut it up into two plv enough steam to feed the cylit1 ocomotives, and electrified part of its line. But in operation, both speed and po he old iron horse, the largest ever built. are limited bv the steaming capacity. |

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POPULAR MECHANICS 949 A Giant 2-10-10-2 Whose Four Cylinders and Twenty Drivewheels Pull Coal Trains . over the Mountains = Here Another Pair of Cylinders Has Been om 7 “ Added t Operate Drivewheels beneath | the Tender | | | ' { The Size of the Driving Wheels Stamps +—-- — —— - | This N. Y. C. Hudson Type as a Fast and | | Heavy Passenger Engine High-Pressure Articulated Locomotive —— Above, and, Below, a New British Tur bine Engine Which Has Boiler Only ir the First Unit and Carries the Driving | Mechanism on the Tender: It Is Used in Express Service |

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950 POPULAR cieé severe conditio1 the boule ao not produce enoug Ste to keep ¢ C\ det niles Such locomotives are mus- i be na ee 1 4 1 Ne € ( ocomotive embody the re- 1 1 y}1 ( the designe ettorts oO make the e 1 e | eriu \mazing in- ‘ 7 | heey? t-4 va | ( is¢ Ciicic¢ \ € peen Onptames The 1 est ce ces ch Live i ed ler eC! necre YD e! ( 1 ev « Hye n € ¢ ted a TOLLOW 1 Ine ‘ ' thre ( ) r ) e pres 1 ire ‘ whe eating dey P oO 11 1 1 Cart tie i¢ De ture 1 t - eam cle T ] tT T T na T t t | »+ “o ( ( f endel ate vetore it O¢ ) € PO TLE qi ine easing { { } 1 +] re: , +) - Ze ¢ the e De and tne ea O! e sul ‘ , ce r sing water to be transtormes nto team a ne capaci \ of a iocomotllve is propor- onal to its boiler pressure. With a pres sure of 100 pounds, for example, an engine mav develop 38,100 pounds tractive pul \t 200 pounds’ pressure it will develop a tractive force of 76,200 pounds—twice as r much. Until very recently only a fe pound number built pressures 265 pouns ne pecia ory ire oO fountain-Type Passenger Locomotive, Built in Canada for the National Railways; and, Above, Three Cyl- MECHANICS oiler pressure of 850 pounds, at Whe factory methods are found to stre: aving ot forty-five per cent. the boilers to withstand the bending of the extremely high pressures, we ire reduced } 1 , ’ Superheaters, aiso daeveioped lnv, are not vet gene lv used | 1 7 1 i,a ougn most ¢ the ne Vb + 1 T oO es have them it 18 a prope + ) ' , ] eam that the higher ji tempera ) ; - salier -3 5 ] Qe lore rapidiv ‘it expands. ote 200 pounds’ pressure, when superle 2) degrees, increases approximate! ird in volume. The importance is the saving in steam, as two poun } e 1 r 1 do the work of three. The superhe from fifteen to fifty per cent boiler’s capacity, depending on the sure and the degree of superheat. Twenty-five per cent of the heat e1 the smol estack. Part of this waste is used to superheat the steam be Another s« team, led into the cvlinders. “at the tender before it flow is turned into 1 le locomo few mont! inders and Their Surrounding Parts Cast in a Single Unit created in the locomotive fire box go¢ the boiler, where Yet a check-uy showed that fe han 5,000 of steam locomoti

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POPULAR MECHANICS comotive Boiler and Fire Box Loaded on Two Flat Cars; Enormous Fire Boxes, to Provide Heating Surface for Su use in the United States were equipped h feed-water heaters. hat further increases in boiler efficiency made in the next locemotives will be years, as higher pressures are made cticable and improvements are made he superheating devices, designers are iin. In fact, they admit they must iust the possibilities of improving the ; l vt iron horse or see him become obso Competition has forced sieam-loco itive builders to make radical innova- ns in their engine designs. Forty years ago when the first electric olley line was successfully operated, the resident of one of the country’s largest ilroads predicted that the steam locomo- e would disappear within twenty-five irs. The automobile has almost driven he trolley lines out of business, but the ron horse still rules the rails. Now the steam locomotive is beset by everal rivals. Jetween 1900 and 1920, he number of steam locomotives grew rom 37,000 to 69,000. Now there are not ore than 64,000 iron horses in hey face a real fight to survive, for the past few years have brought amazing de- service. 951 the Mammoth Engines Used Today Require ficient Steam Making velopments. Tremendously powertul elec tric locomotives have supplanted steam on long stretches of roa lway. Europe is developing the Diesel-type of internal- combustion locomotive which can be op ly, and the h can cover 450 erated much more cheap steam- turbine locomotive, whic miles without refueling. There are gaso line-driven locomotives, storage-battery locomotives and one th operates ona charge of live steam. developments, all past the experimental stage, explain why the num These new ber of steam locomotives in service has shrunk from 69,000 to 64,000 in the last few vears. In light-traffiic work on Ameri- can railroads, there are already in service nearly 500 gasoline-electric cars, some ca- pable of pulling several trailers. Thou- sands of coaches are in operation, chiefly in suburban service, in multiple-unit that is, from a trolley to operate dynamos trains; each car receives electric power on the axles. In the face of opments, it does not require great courage that these remarkable devel- to predict once more steam is neat ing the end of its usefulness on the rail

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POPUT .AR MECHANICS ewer, more pow- voracious ap} ul and more of the old heaply operated ioned iron ls will send the Was not a se! on horse to the drain on tl rap heap. Such road purse prediction would hen it ce e safe if the iround $5 to tea ocomotive ton of coal reached the New German Turbine, with Water Condensers in the ender. the ; Tender; Below, the Geared Turbine with Cover Removed : mit ¢ its deve of coal i vit OF ent Bu urp ng as it may seem In the three-cornered fight bet argy so far as real development concerned, steam is t the t] “€ hold of infit te po sib ties As i practic ndicat 1 Oo} what has happened, consider the fuel economies of the t ¢ veal lt 1923, the average ce consumption ot passenger locomo- tive s 18.4 pouns tor each “pa senger- ( mile In 1926, t] had been reduced 15.4 pounds, a ng of sixteen per cent. Over the me period, the fuel con- umption ot treig locomot Cs Was Tre- duced from 163 pounds to 130 pounds in hauling a 1,000-ton train one mile. a sav ing ol twenty per cent. he real significance of these figures is lost in the lact that they are averages. As the older locomotives are replaced \ ith the modern type, with superheaters, feed- vater heaters, and gradually Increasing boiler well-founde charge of excessive cost of o no longet be possible. Iu been due to unwi moderni use of fuel by pressures, the present nerati pe al Mucl oO} llingness ze their locomotives with rious economy devices becau e of tial cost. When tender coal cost on wil d of the waste- Steam locomotives has railroads to the va- the ini- dollar d the internal bustion mportant cons tion, from a railroad standpoint, i bility of operation under all cond The great electric locomotives more useful on steep grades, but the « trics have this drawbacl Chey lose 1 rapidly as speed i increased WI ¢ Diesels operate cheaply, they are st heavy for all-around work The | weighs, as a rule, around 275 pout each horsepower developed. The locomotive weighs on an average not 1 than 220 pounds. Considerations such as these will what sort of used on the railroa nine motive t the power 4 ds o future. A other factor, neithe mechanical not ot ne; tical, operates in favor railroads are poor, mar the to their roads or to purchase improved type of ot 1\V iT They cannot get money locomotives. Cheretore nece¢ they must continue to use steam. The cannot scrap billion dollars’ worth ot IS Of steam locomotives because they art just more expensive to operate. This may not be sound economy. Then

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POPULAR MECHANICS 953 ; n it probably is, because the railroad PORTABLE WADING POOL IS tors and the locomotive builders real- NEW PLAYROOM JOY hey must make the iron horse do more ——— = —_— and cut his feed bill. The field of elopment—higher pressures, cut-offs, vater heaters, superheaters and im- ed design—is still practically un- uched. The iron horse is steaming into rvelous age. EGYPT’S MUMMY FLUID USED FOR MOVIE FILMS One of the “mystery” fluids, used ‘tians in preserving their mummies, is bv the employed in the manufacture of mo- ' t pic i ure film. It is an acid, obtained waste wood. Certain derivatives of ubstance enter into the making of the Its preservative qualities are due ef] to the presence of wood alcohol reosote The old Egyptians pre red it in much the same way ds ft is now ned, by heating wood to a high tem rature in an inclosed chamber and con Demonstrating the Wading Pool for Playrooms; ar HUMAN HEADS WARN SPEEDERS Attractive Border Makes It Decorative TO OBEY TRAFFIC LAWS | | re t ¢ dea ot t e ¢ i 1) Motorists in certain parts of Pekin, tub . portable wading tank for the hina. are visibly reminded that the speed door plavroon ha hee ntroduce mit is fifteen miles an hour, by means ot Water connection is made im warning signs at various street inter framework in somewhat the same manne ections. Hung with the legend, which is as shower bat! re attached to faucets itten in English and Chinese, are boxes The tank can be stored in small space. MANY USES FOR COTTONSEED BOOST CROP’S VALUE ) ( 01) 15M } i ottonseed and its by-product ire en ILES PER HOUR | ae ploved in the manutacture ot stuthings 1 RRQ O2g7 ey 25 Hwee | oon . ttre nd wud! t i is ( - OMS c ( eC! elt. clothing d low-g é la " «| cane e t ¢ }¢ pe e expi ¢ 1 ( ¢ is nd phe g I . 1 other ] ¢ ie ¢ 1 7 ource of! ( | ind r » 1 e il ) ( T eT feed nd l¢ It hee ¢ ted that the seed add | S500 000 000 _ a nually to the nations h ce I l In Pekin, Heads of Chauffeurs Who Violate the Speed vear. more than 6.000.000 tor were Laws Are Cut ff and Ext as a Warning : : ‘ Cc Off and Exhibited as a ing crushed. vielding 2.000.000 pout f crude containing the heads of chauffeurs who oil. 3.500.000 barrels of refined oil an have violated the speed laws. nearly 3,000,000 tons of cake and me

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POPULAR Testing Parachute with Dummy at Lake- the Square ms Bes SS ypies Are Easily Folded hese Carn nurst, SQUARE PARACHUTE IS TESTED FOR NAVAL AIRCRAFT I;xperiments with a square-shaped para chute as a substitute for the usual type, have been conducted at Lakehurst, N. J If the tests, which have been made dummies instead cf men, prove satisfa tory. it i proposed to adopt this torn or naval aircraft GAS ENGINE COOLS ITSELF WITHOUT WATER °.9 1.1 ith no visibie means 4 \ gasoline engine w of cooling, because it uses a “refrigerating stroke” to dissipate the heat trom the cyl inder walls, has been England by len ' tecl in aemonstrated in ‘ ‘a 4 ; a. ‘ a New Zealand inventor. It is claimed to recover a large part ot thie energy wasted in the cooling water of an ordinary engine, and to put the reclaimed heat to useful work, thereby saving tuel ; ; : oe lhe motor is a tour-cycle engine, tn that there is only one firing stroke per cylinder for each revolutions of the shaft, but it is actually divided into five two crank- MECHANICS On the intal the inlet valve is open for but ha phases, instead of four. stroke of the downward stroke. The valve tl] closes, mixture 1 and the gas which been sucked into the cylinder is expande stroke continues, until a part vacuum of ten pounds less than atm The cooled, in accordance with law. As th temperature drops, they absorb the he 1, as the pheric pressure is reached. are thereby well-known thermodynamic of the previous power stroke from the « inder walls. On the compression strol owing to the absorbed heat, the temper ture isc iderablv higher tl ssnal ture is considerably higher than usual the compression ratio is also much highe Ratios as high as twenty to one have bee: used in the test motor RACER FOOT CAR FOR CHILDREN LATEST ROADSTER NOVELTY Youngsters on the Riviera have been « joying rides on racing roadster cars th they can pedal at considerable speed. | ead of the usual tvpe of body, these | i flat board installed edgev ise and paint ith tl | “{ tic lines and marki i the characteristic of the hood of a racing automobile. ; is equipped with a lightweight cl fast travel Cal and slender wheels for Child’s Race Ca Reflects the Slends Streamline Patterns of the Fastest Aut mobiles and Is Equipped with Real y istic Steering Whe

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POPULAR MECHANICS SLEVATED SUPER-HIGHWAY TO COST SIXTY MILLION elevated highw ay, nearly ten es long and to cost $60,000,000, eing planned for Chicago as a super- for automobilists entering the city he northwest. One hundred and vo cross streets, which now re e si ing down or complete stops for ing traffic, will be eliminated, while mps will accommodate twenty ee feeder streets, distributed at regular tervals. The super-highway will start he northwest corner of the down-town p district, where it will connect with a uble-decked boulevard along the north k { the Chicago river. The roadway be 160 feet in width throughout its ength, and will cut three miles from the ce ni traveled to reach the coun highwavs which branch out fan-wise northwest. 250.000 vel he It will have a capacity icles a day, and will connect ith 300 miles of paved highways which erve 1,100 square miles of northern III nois and southern Wisconsin. FERTILIZING FISH FARMS lust as the value of fertilization and cul- tivation of the soil has long been recog nized, so fish “water farmers’ —those who raise are coming to realize the importance of adding fertilizing materials to the “~~ Fe i ~ te SS bg © ty seas sae eagas “ «58a ‘ a “a FY Engineer's Sketch of Elevated Oo § & Super-Highway, Ten Miles r ‘ah, / . Long, Planned for Chicago tation. a marked increase in the vie Was noted after a mixture of phate and other materials Was idded the vater. It has » been ound that cer- tain small fi hicl ( ecit i e blac] bas eed ( i ( nN in eater numbe gy the th an abundance ot egetable matter and other substances hich the bas vill not consume, but which the smaller fish levour greedily ELECTRIC KETTLE HAS WHISTLE TO PREVENT OVERHEATING When ter boils elec tric kettle now on the a ] et, a \ ] tle blows as ial that the cur e1 can be shut ( } nd ST ¢€ yore a e dey ¢ i oO prevent Ove}! and reducing its life.

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BAD | HORAID Performance Thermometer for Shows When the Singing Is Good or Bad CHORUS “SONG THERMOMETER” STIMULATES SINGERS Training Chorus; It lo encourage chorus singe to pettet STICKY TAPE ON ERASER LIFTS TYPEWRITER LETTERS POPULAR MECHANICS a time. Slig is applied to one letter at pressure and then a quick jerk obliterat the typing used, Che tape is rolled up as o that a 11 rpie, surface is aly fresh avail and replacement rolls of it a supplied for the reel NEW YORK-VERMONT BRIDGE TO SERVE MOTORISTS \I tor routes between the Adironda ind the Green mountains will be ened from fiftv to 150 miles by a S900 00 bri lee t be built across Lake Chan pl linking New York and Vermont lt also mark sites important in Ameri tory, for, at the New York end, are { i Frederick and Amherst. The forme: built by the British and captured b Frenc I thre | encl i! l In t Fort Amherst was taken from the Br by Ethan Allen’s Green Mountain B was recaptured bv the former at 1 tl } ndone tter the ] ++! " — ¢ tpahnaoner Atle! IN¢ Wal “ I ra lt was here that ,enedict Arnold et with a fleet to defeat the British o1 northern end of the lake. The bridge be 2,190 feet in length. NAIL THAT WON’T SPLIT WOOD HOLDS MORE FIRMLY With 1 tri instead ot a sharp angular tip point, a nail, devised especially for use cking crates and boxes, ill not readily split the wood and is said more firmly than the kind. The ordinary usual nail acts as a wedge as it enters, often fore ing the fibers apart to the extent ot plitting them The triangular- tipped nail fune like a gives tions more punch and the wood more surtace against which to lension is spread around the nat tead ot in ise with the just two directions, is is the \ I common variety ters the wood like an ax.

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Wrong Side Up / Composite of Five Photographs of U. S. Army Planes, Looping, Rolling and Doing I **Aerobatics,”” (; ERHARD Fieseler, the German stunt x fiver, recently announced the perfec- on of a vertical figure &. To the non-flyer at doesn't sound exciting, but ask a killed stunt pilot what he thinks of it. Major Reed Landis, } 1 famous war-time ace, much about atics as anybody in the claimed, 10 knows as aerial acro- country, ex- “Marvelous!” when he heard the news of the feat. For a vertical figure 8 is a combination of an inside and an outside loop, and it has been less Lieut. than a year since Doolittle, U. S. A... retired, per formed the first outside loop in the his tory lames v of flying, and came down with his eves popping out of his head as the result of the terrific Lieut. Doolittle, who can turn vertical banks around a race pylon steeper and tighter than anyone else has been able to turn them at high speed because his “insides” strain. seem to be pecul- larly constituted to resist the terrible cen trifugal force involved, declared when he landed that he would never do an outside loop again. Lieut. Al Williams, navy race pilot, re- cently tested a fast Curtiss Hawk pursuit ship in inside and outside loops, barrel rolls and other “aerobatics,” carrying an or Aerial Acrobatics, Are Essential in Every Pilot's Training mmelmann Turns; iccelerometer measure the strapped to the strains on wing to and the The tests showed that, in an out- side loop, the himself plane. centrifugal force w great that Williams’ 200-pound weight in- creased to a thousand pounds, and the en- tire the plane, about 2,100 pounds, was converted into 13,000 pounds as the ship swept as so WW eight of through its circles at 200 miles an hour. In an inside loop centrifugal force tends to keep the pilot in his seat. He doesn't even need to be strapped in, tf fall a Oy ile can't out any more than the adventurous souls who looped t] e | park fact, an inside loop is 1 } Op on amusement rides twenty vears ago could. In pertormed just like the old stunt, starting usually vith a swift drop to get up speed, then a quick climb up and over the top, and 1 an carnival other drop down the backside of the loop, followed by a level flight again Yet it wasnt until November. 1913, that the late Lincoln Beachey performed a gen uine inside loop in America, while the French flyer Pegoud did the first world on Sept. 13, 1913, at Issvy, France. An outside loop is just the reverse. If is started with the plane flying right the pilot first noses down. side up

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POPULAR MECHANICS ae — — — de, ANSIDE SCOR STAAL ES HOLMAN, OUTS! DE t LOOP- most CANCEROUS CONSECUTIVE LOOPS OF THIS TYPE, PERFORMED BY LIEUT. JAMES DOOUITTLE, ANO & FRENCHMAN HAS @EATEN U.S.A., IN 1927, THIS RECORD witht uit. IN THE UPSIDE DOWN POSITION, SPATE IN THE UNITED CENTRIFUGAL FORCE TENOS ATES BY LINCOLN EY, TO thimow THE FILOT CONVINCED SCEPTIC WARS iT was as? — OPTICAL ILLUBION. THE ROLL~as 5 SEEN er Pt tt nme A PLANE. oveR. o's R wTeO wird ANOTHE Si0E SLIE OUT OF THE PLANE.

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POPULAR MECHANICS VERTICAL aie oe elo» ; q = << ire & ABOUT AN IMAGINARY POINT, USVALLY

pl see EXCEPT ON PUR POSE. Fi - BY GERHARD rieguee ‘ cénents. e AN INSIDE AND OUTSIDE LOOP. AN IMM ELMAN N TURN- OLVED OVA THE Bi ge AS waanne a op ai MAKIN : Quick REVERSAL OF DIRECTIO TT COMBINES a ¢8 INSIDE LOOP WITH AHALFE THE PLANE AIGHTING 1 iTSELE AT THE Top OF THE LOOP.

R

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960 POPULAR MECHANICS normally accustomed t so that every step mu planned advance, and then pra ticed until it automatic. be carefully becom«: Things ha; pen so rapidly in the a that it is difficu for an observer on t! often ground to sav just wha Be fo! actually pei takes place. Beachey formed the first loop | had for months execut what, from the ‘looked grout } like a loop, but flying a mile high only put his plat through a steep verti bank in a 100-foot cir When nounced his premier loo and followe with his announcement experienced flyers, Pegoud Beachey Wright, the same optical illusion claimed it and it took several de: onstrations to convince the doubting ones that 17 man really could fly u ide dow n. The chie reason for doubting th: loop was the theory that the engine would stop be cause the carburetor: Trailing a Streamer of Smoke, a Cabinet Plane Dives Out of the Clouds to Start a Dog Fight with Three Enemy Ships 1 pulls the plane back and under, climbs straight up, and then Fieseler does it two ways, a downward [n the latter, he first half-barrel roll until he is flying upside down, then noses upward as though for the usual inside loop, except, as he started from an upside- levels out again. and an upward loop. rolls the plane over in a down position, he is on the outside of the circle instead of the inside. It took weeks of studying of eac 1 } 1 sep- arate movement before he perfected his vertical figure 8, performing it sometimes with the inside loop first, and again with the outside one at the top. In upside- down flying, the controls work in just the opposite direction from what a pilot is could not feed gas to the cylinders when the powet plant Beachey con tended centrifugal force would carry him was upside down. over the top of the loop, and the engin would then. start and this ide proved correct. The tail spin used to be one of the most deadly causes of flying accidents and ccn time teaching ne again— siderable pilots how to avoid it, and how to get out of a spin if the plane should accidentally go into one. The chief requisite for get ting out of a spin was plenty of altitude to maneuver in. With modern aircratt changed. was spent conditions have Planes are built now which can’t be without deliberate intent on the part ot the pilot, and which will come out of a made to spin

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simply setting the controls in neu- \ few years ago a failing motor was terror of flyers, because loss of flying eed almost invariably meant a tail spin. dead-stick landing—one in ich the motor is stopped either by ac- lent or design—gave a real thrill. i] planes are built now which will prac- llv fly themselves even after the motor cut off; in fact, as they lose flying speed ey will “pancake” toward earth on an en keel, without a hand on the controls. Col. Lindbergh’s favorite stunt is a side p when landing. It offers a quick and ectacular way to lose altitude. Normally, ver approaches a landing field at a fairly ul altitude, to give opportunity to look ver before coming down. To lose the titude a few drop one wing so low that ceases to support the plane, and then lip downward and sideways. lwo of the most popular war-time ma- euvers, which aren't used much in ordi- iry commercial flying, are the barrel roll d the Immelmann turn, the latter named -the famous German pilot who invented fhe Immelmann turn offered a quick iy to get out of trouble or to return to he attack after passing an enemy. The lot simply pulled the nose of his ship up though to do an inside loop, and then, 1 } i ilarlv a Sev- the top of the loop, dipped one wing nd rolled the ship over in a half-barrel ll, so that, instead of flying upside down, vas right side up, but reversed. Che full-barrel roll involved a double turn. Lowering one wing in a side slip, he pilot kept on until he was flying upside n, and then by side slipping again, mpleted the evolution, either in the ime direction, to produce a letter-S ef- fect when viewed | ead on, or in the pposite direction, | hich produced a With war- time planes, the roll nvolved some loss f{ altitude, but odern high-speed ips can be rolled so rapidly there is | practically no dip, | and some even can rvir 2 rure Oo. POPULAR MECHANICS 961 Vacuum Cleaner Rigged as a Sprayer for Furniture or Other Articles SPRAYER ON VACUUM CLEANER SAVES HAND PAINTING Painting your automobile, furniture or walls with a vacuum cleaner, sounds fan- ciful, but that is essentially what is done with the aid of a sprayer attachment easily fitted to the cleaner hose in place of the usual nozzle. It has an instantaneous shut-off and the air forced from the cleaner insures a thorough job of spraying. TILTING AUTO-SERVICE TRUCK HELPS BRING IN WRECKS lor hauling tractors and disablec truck man is 1 auto mobiles, a service devised by an equipped with a ly that can be tilted up until the back rests on the lowa garage bor ground. This facil- itates loading. The movement is ac complished with the aid of a hoist at the forward The body is quickly re- turned to the nor- mal plane after fill- ing. A tractor can end. be rolled while they climb the truck un- are climbing. Service Truck with Body Tilted for Handling a Tractor; the Same Arrangement Is Useful in Towing Wrecks der its own powef.

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PrVe, ANG WiliCil Wilt COMIC OUL OT Suspended from a Lightship, the Submarine Bell Transmits Under-Water Warning Signals When Fog Is S Thick That the Light Overhead Cannot Penetrate It A GREAT liner, ablaze with lights, is ” ready to sail New York, to Europe bound. The hour is midnight, when a dozen little tugs snake the tower- ing ship out of the pier slip. Electric tele- graphs, scattered over the ship, transmit orders back and forth between the chief from of the tug captains and his aides, direct- ing the operations. Well clear of the rows of piers along the shore, the tugs back away and allow the huge ship to swing toward the sea. Engine-room telegraphs sound their warn- ing bells to stand by, followed by slow ahead and then half speed. With hardly a sound, the big ship slips away down the river, a moving mountain of blazing lights. On the bridge, the harbor pilot calls an occasional order to the quartermaster at the wheel. As the Narrows are reached, an officer dons a radio headset and takes over the task of conning the big vessel down the channel, guided by electric mes- sages. from a cable stretched along the sea bottom. Outside of Sandy Hook, a boat picks up the pilot, the ship squares away for the 962 run to the Grand Banks, and on the bridg the course is set on “Metal Mike,” the cu rent turned mechanical ma takes over the ship. His quartermaste: attendant stands by to see that the electri steersman works properly and doesn’t ru out of oil, but Metal Mike does the work That’s the picture of sailing day, o1 rather sailing night, l on—and a that makes the old time skipper rub his eyes. In the last te: years navigation of the seas has been com pletely revolutionized. There is as mucl difference between the modern crack fly: of the north Atlantic and the fine old “St Paul,” “St. Louis” and other ships oi thirty years ago, as there was between those cruiser-liners of Spanish-Amerizat war days and the sailing packets of a cen- tury earlier. The old-time sailor who strained hi eyes to pierce the murk and spray of a driving rain, snow or sleet storm is gone His successor, warm and comfortable on a glass-inclosed bridge, glances through a whirling pane, kept free from snow and ice or raindrops by the speed at which it revolves. Or if he must go out on the

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re. he has an- revolving window mounted in a hood, ich protects his face y eves while he swings round the horizon. Once ships felt their along forbidding ts and often brought » with sails aback while was the Now storms along at to twenty- and if the of- atch to know the depth of water he deep-sea lead e to iter underfoot. measure e iner entv-three ‘er on w wants der his keel, he turns, button. and an “Metal Mike,”’ presses a visible electric machine sound the hull. tarts a producer on the outside far beneath the waves, to send rnals to the sea bottom, while another ichine their echoes on und \s the the appa- tus, an indicating hand begins to turn, nd when the returns, it I the ie hand gives the exact depth catches the re- officer starts signal lights a lamp, while reading of tiny electric he seaman who served his apprentice- p in sail, or even in the best liners of a veneration ago, learned’ to drive through and rain for days at a time, computing position from the course, the patent log, and dead reckoning, supplemented, in The too. but if he Ste the revolutions. sailor can do that am by lern engine moc Which Guides Human a Giant Liner without with This Small Wheel Help, Is Set is within wireless range of land, he need only don a headset, reach overhead tora handwheel that turns a loop aerial, and tune in on a couple of distant 1 o-com pass stations. Whi the loop points di rectly at the land station, the Is com at their loudest, and it the rl f only 1 few moments to take the compass bear ings, lav them down ] illel ruler and pencil, on a navigation chart, and where thev meet there the ) One by one the pe ~ tt ( ire su cumbing to inventive venit ere were the dangers of storm, of 1 f un charted rocks: the perils of ut e! v ie shores, OL passing hip ] mating watel ¢ logged derelicts and wanderin 963

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ee ee ee eee ee el = 962 964 POPULAR MECHANICS And, on one’s own ship, there was ever-present peril of fire, the most drea danger of them all. Ships themselves are fireproof, since days of wooden vessels have passed, | the possibility of fire can never be eli nated so long as they carry fuel and infl mable cargo. Now, the modern liner, ; the modern merchantman and yacht, t have eliminated the peril by making it possible for the fire to get a real start. From the bridge the condition of ev: compartment in every section of the s| is constantly under control. Delicat sensitive electrical apparatus record ev change of temperature in each part of 1 ship, and sound a warning if the temp: ature begins to rise. In some ships a s) tem of piping leads from every compar ment to a hull model of the ship, mount: behind glass, so that the air in each c be tested for smoke. If fire does break out, a turn of a val floods the compartment with a heavy, ine: gas, which smothers the flames instant and the gas disappears within a fe hours, leaving neither trace nor dama behind, so there is no loss from water. The international ice patrol, establish« after the “Titanic” disaster, has robbed t! fog-shrouded reaches of the western oce« of much of the spring-time terror, for t! coast-guard cutters ride herd on tl southward-bound bergs and report eac day the position of ey ery one, until, in th warming influence of the Gulf Stream, has melted down below the danger size Uncharted shoals and rocks, at least o1 all the regular courses, are things of the past. The ocean bottom is so well know: that it is possible to compare the echoe returned by the “fathometer”—as the sea depth indicator is called—with a chart made for the course and tell just about where the ship is. But it is in the aids to navigation that the greatest advance has been made. Once storms swept up over the horizon and often tore the sails away in ribbons be fore the crew could smother the canvas into reefs. Now the liner at sea can get the weather map each day, drawn by an automatic radio-operated pen without the help of any human hand, the governing Sailors Laboring on Lofty Skysail Yards, and the Slow signals coming through the air with the Task of ag nn yey ee Alike Are speed of light, just as they are trans-

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POPULAR MECHANICS 965 ZI } fp j ; ‘i la WZ | : Ul = 7 ~ is “= = > ‘ PULVER ip RNE FLAME TATED Y AIR RE TO AID COMBUST Even the “Black Gang” Has Been Replaced, First by Oil-Fired Boilers, Then by Diesel-Motor-Driven Ships and Now, on One American Vessel, by Powdered Coal, Which Is Blown through Pipes and Burned like Oil the Coal May Be Pulverized on Board, as Shown in the Large Drawing, or by a Plant Ashore, as in the Insert Sketch, and Then Piped Aboard

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966 POPULAR MECHANICS HYDROPHOM— ame cre ca The Electric Sounder, Above, Has Replaced the Lead; at Right, the Indicator Which Shows the Sea Depth mitted from the naval station at Arling- ton, on the heights across the Potomac from the capital. With the weather maps for each day available, the navigator can trace the development of each cyclonic storm center as it sweeps across the coun- try from west to east and so out to sea, or as it moves north and west across the middle Atlantic, turns northward along the coast, or up through the Atlantic states; or, in exceptional instances, circles over the middle west, before recurving out over the north Atlantic. Watching the advance of the storm, getting the daily +4 radio bulletins on its progress o and intensity, and the reports of other ships, he knows just wh: and how hard it will strike. If he runs into fog, he kno from his radio reports, whether there are icebergs ahead. H automatic fog siren sounds regular warnings to the fishin; boats that may lie in his path along the Grand Banks. Wir: less and submarine sound de- tectors both keep check on othe: large vessels in the neighborhood The submarine sound detecto: is a story in itself, and, like many of the other new devices aboard ship, is an outgrowth of the ir tensive study of the submarine menace during the war. An automatic bell, under water on the ship’s hull, sends out con- stant sound waves, to be picked up by listening electric ears, just as the ears of the ship will pick up the waves from the bells of others. Along the shore, similar bells are in use, transmitting their signals farther than a foghorn can send sound through the air—often farther than the best of the coast lights can be seen. «

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POPULAR MECHANICS 967 a her’ > ~ - Officer Listening to the Submarine- Bell Receiver, and the Control ~ Board of the New Turbine-Electric | Ship “California,” Largest Liner Ever Built in the U. S.; the Four Levers Control the Ship re ws. “Metal Mike,” Left, and Standard Elec- me tric Steering Wheel of the “California”: Engine-Room Controls in Background

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968 POPULAR MECHANICS serve to keep them afl A liner speeding throu the night at twenty-five land miles an hour can be badly damaged, should it strike such a mas Another use for the submarine bell has been found in conjuncti with automatic radio a paratus on lightships marking channels off i: portant ports. Radio waves travel through th: air with the speed light, but sound traveling in water ad- vance only 4,800 feet per second. Knowing tl the navigator need onl Wave = ——aeeee Ss oe = as a eee a @ ESps= 22 seasseseete a rt TTS Average Yaw © as measure the elapsed ti: between the receipt of radio signal and a subn rine signal, sent simult neously, to figure how { he is from the sou source, on the lights! At the same time, t radio direction finde gives the true bearing the lightship, so it is po The Steering Engine, Operated by a Gyro Compass, and a Typical Steering Sheet, Showing the Tremendous Yawing While under Hand Control Some experiments have been made to utilize the submarine-bell and fathometer ideas to detect icebergs by reflecting back sound from them, for a big berg, with the greater part of its bulk under water, ex- tends to depths of several hundred feet. If these experiments, which have shown some promise, meet with final success, it is possible that other ships and particu- larly floating derelicts may be located, too, by echo. The derelict menace is always present, though the coast-guard cutters and a world-wide system of reports on navigation menaces, serve to reduce it. The cutters scour the seas to track down every derelict reported and either sink it by gunfire, blow it up with bombs planted in the hold, or tow it to port for salvage. Some of them are hard to destroy—a dis- masted lumber schooner, for example— because, no matter badly water- logged they may become, their cargoes how sible to plot the line: position on the chart with that single bearing instead of requiring cross bearings fro two radio stations to fix the distance fro: ship to shore. The revolution in modern ships reall started before the war, with the first app! cation of gyroscopes to seagoing prob lems. Now there is the gyroscopic com pass, “Metal Mike,” the gyroscopic helm man, and the gyroscopic stabilizer, that make a relatively small vacht or ship ride as smoothly as a giant liner. Metal Mike, because he replaced human hands and does the job better than en man could possibly do it, is the most in teresting of the three. In the old days, two, three or four men struggled with a huge wheel, fighting the kicking ruddet to hold a plunging ship on her course. Then came steam, and later electric steer- ing engines, which reduced the labor, but, if anything, made good steering harder, for the helmsman no longer had the “feel” 1 otne!

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POPULAR MECHANICS 969 Fire-Alarm Signals on a Private Yacht; the Presence of Smoke in Any Section of the Model Indi- cates the Location, While an Electric Bell Rings to Sound the Warning to the Officers ~~ One of the Two Driving Motors of the Liner “California”; Everything, Even the Cooking, Is Done Electrically ae Ship’s Engine-Room Con- trol Signal, beside One Built for a Small Motor- boat, and, Right, the Ap- paratus for Launching a Liner’s Lifeboats

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970) POPULAR MECHANICS of the rudder to guide him. In tact, the both utilize the same principle: th only guide he had was the normal tend- that a gyroscope revalving at high ency of the rudder to return to an amid- always maintains its axis in a fixed ships position, tion with relation to the earth. The Steering a speeding liner, with the bow scopic compass always points to the continually trying to fall off the course north, and not to the magnetic pok every time a wave slapped it, was no easy cause the earth’s rotation, not magnet job. Good quartermasters became {fa- is the controlling force. mous, and men like Herbert Hartley, late With the magnetic compass every c commodore of the “Leviathan,” and other taken from the chart must be tran famous captains, rose through their abil- into a magnetic bearing before it c ity to hold the old “St. Paul,” “St. Louis,” transmitted to the helmsman, and eve; “Paris” and other American liners totheir bearing taken from the magnetic-co1 proper course. card must be translated into a true « But with the introduction of Metal pass bearing before it is applied to Mike, everything was changed. The ship’s chart. That would not be difficult, bow need only be laid on her course, the magnetic-compass error was alway gyroscope helmsman started by closing a same, but it not only differs for every poit switch, and the machine, with more than on the globe, but is constantly changi: human intelligence, will hold the vessel from year to year, so sums must either to that course far better than the best added or subtracted from every magnet steersman could do, and without regard to bearing, to correspond to a carefully storms, cross-seas or other circumstances, pared table covering the number of y: Metal Mike and the gyroscopic compass since the chart plate was engraved. | One of the Two Turbine Generators, Which Furnish the Electric Current to Run the “California,” and Operate All of the Electrical Conveniences Which Make Traveling Safe and Pleasant

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POPULAR Mike’s compass brother elimi- that. He points constantly to th pole, instead of the magnetic ) matter where on the earth’s sur- may be. Because he works on a cal and electrical principle, he need to be mounted on the bridge. the master compass is usually below deck in some distant com- ent, with a series of repeater com- hooked up to give identical read- the chart house, on the bridge, in ptain’s cabin, or any other place. not difficult to see uch an uncanny in- ent can be adapted steering itself. In plest form, a set of cal contact unted in the gyro points ss, and, as soon as move to re- the turning of the the circuit is closed, ins to ll motor operating MECHANICS 97) fheer of an Atlantic Liner Listening In As He Turns Loop of the Radio Direction Finder; Above, the Revolving Sleet-Proof Vision Screen as Used on an Open Bridge the steering wheel started, the brought back to position, and ship often before the eve could have detected it was beginning to yaw. An automatic course re- corder, showing the steering of Metal Mike in human illustrates the the ma competition with control, superiority of chine over the quartermaster. The automatic course recorder is an other of the gyro-compass developments. A simple clockwork mechanism to turn a paper-covered drum, and a pair of record ing pens operated by every movement oi the gyro’s axis do the trick. Electricity is doing so many things aboard ship these days that it has even supplanted the bull-like bellow of the old- time first officer and the megaphone which sometimes aided him in transmitting or- ders from poop to forecastle. Nowadays a complete telephone system connects the acres and acres of space within a big ship, while engine room, chart room, bridge, and other control positions are interconnected with loud-speaking phones. There is a specially designed tele phone instrument which can be u even sed in the noisiest engine room to transmit the

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M2 POPULAR MECHANICS -e onlv and eliminate all other sounds. Even the lifeboat has been taken _ + l | ips, tramp steamer and others of with a wireless set of its own. M ; that cannot afford all the latest refine- the larger liners now carry several p ents of navigation as practiced on the’ boats to tow the other life craft in ¢ north Atlantic, have not been neglected in of shipwreck at sea. The power vision for safety. Automatic wireless with engines and battery power ava sets are available which send out an ap- are equipped with regular radio sets peal for help without the aid of an expe- the smaller boats have radio, too, a rienced operator. With their direction- set with collapsible mast and getti: finding radio, larger ships in the vicinity power from a generator turned by a c1 can take the bearing of the signal, and by like the old-fashioned magneto telep its intensity and the known range of the And, as there aren't enough radio itic sender, compute the distance, erators on a ship to furnish one for « if two liners equipped with direction lifeboat, the little sets are entirely, nders get the signal, they can, through matic. As long as you turn the cranl n exchange of messages, Compute the machine sends out the distress call. exact location of the vessel in distress. The same efficiency is being appli And to make sure that no wireless op- other directions, perhaps at the expe erator, working his set on some other of some of the romance of the sea wavelength, misses an appeal for aid, the the increased safety makes the saci bigger ships are being fitted with auto- vorth while. In the old days of oil atic alarms which respond only to the terns, when the lookout on the foreca SOS call, when they ring a bell to attract struck the bells at night and called b the operator's attention. on every half hour, that the lights —_ c P ' Oil-Fired Boilers of the “‘Montroyal,” Where Grimy Stokers Have Been Replaced by Pipes That Feed the Liquid Fuel to Jets in the Fire Box

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Vpen btricge POPULAR MECHANICS 973 ne bright, it was romantic. But f[ — lays there is an indicator in the house carrying a number of pilot and one lights up automatically to the officer of the watch if any one ‘running lights goes out. And if one he only has to turn a rotary switch ing another light into operation in of the one that has failed. low deck the modern ship is pro ng just as fast as it has on the e. Oil burners have displaced coal the better ships, and now powdered fed through pipes like oil, is threat- to supersede the black liquid. Oil, dozen became almost ersal on the bigger ships, as well as of the smaller ones, because it saved money and labor. It displaced the iting, laboring “black gang” of ers; it reduced the time wasted in port iuse it could be pumped aboard faster coal could be loaded; it eliminated lrudgery of cleaning ship after coal- and saved much repainting, while fur- ings in the passenger cabins lasted er with less frequent cleaning, and, lly, it made better and more econom- | operation of the engine room possible. [he new powdered-coal system, success- lly tried last year by the U. S. shipping rd on the freighter “Mercer,” prom- to introduce to the sea the same econ- which has proved a money saver in years or SO, nts ashore, including the great Ford er plant at River Rouge. The pul- ized coal, mixed with air; is blown ough pipes, just like oil, and fed into furnace burners in the same way. The ercer” installa- n carried a small rushing plant board, so that or- fuel ided in the bunk- and powdered needed. This sys- m eliminated the ssible danger of fire risk n the fine coal dust. he coal may some iv be crushed hore and piped hoard into the fuel inks, laTy was creased Loxla Thornton, ator, J This Old Steam Engine Ironworks Grounds Its Period of Duty Done, Serves as an Observatory in OLD STEAM-ENGINE MONUMENT SERVES AS OBSERVATORY After nearly fifty of service, a steam engine of the heavy-duty type has been converted into a monument on the Germany. years grounds of an ironworks in A circular stairway leads to the top, from which the whole plant can be seen. ARMLESS FLYER PLANS TRIP FROM NEW YORK TO PARIS Loxla Thornton, Armless Avi- . , Who Hopes to Make a “*! Transatlantic Flight is making plans for a transatlantic flight armless aviator, this year. He has been flying for nine vears and can op- erate any standard make of craft with- out extra attach- ments, it is said. He controls the stick by means of an iron hook and it is re- ported that he had no accidents in his flying. has

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974 POPULAR MECHANICS GIANT TRENCH DIGGER DOES WORK OF MANY MEN about one-sixth the of hand methods. It a trench, sixteen wide and five feet depth, unwinds cable from a dru and drops it in the ex vation, and as the outfit moves along, the eart carried back and tat down so that the entir operation is finished \ forty-five horsepo motor pulls both chines and the rig mo on endless treads so t! Top, Cable-Laying Outfit Complete; rier and Back-Filler Spout and other cables, unit devised by ._ does the For laying telephone German men at a combination igineers work of many BOATHOOK PUTS LINE IN RING AND HOLDS MOPS With an improved the market, the mooring line is through the and time. a spring socket boathook now on automat- ring, accomplished by o. °® ° ce ° F which ejects the hook from its after the ring has engaged. ically passed saving work This is been ) Close-Up of Hook, and How Line Is Handled Below, Close View of Cable-Drum Car- it can traverse ruggt territory. It will lay 1 200 to 300 depending upon the and only five men are requi to manage the entire outfit. feet of cal per hour, charact of the soil, Line and hook are then picked up by grapple at the side and drawn in. 1 shaft and holder of the boathook may be used for scrubs and mops. CATCH CROOKS BY TELEPHONE TO HELP REDUCE CRIME Broadcasting news of a crime, with scription of the criminals, to a towns and officers at one and the sat time, has been made possible in a C ifornia county by score co-operation betwet the telephone company and the sheri office. Immediately the latter receives n tice of a murder, the sheriff’ other crin 1 telephone operator calls th long-distance operator at telephone head TC »bbery or

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ers. All the deputy sheriffs, chiefs lice and constables, in twenty-two towns and all the suburbs, are | at once by plugging in connec- to all of them. The sheriff's op- rin one message, gives all the avail- letails of the crime with a descrip- of the criminals and the probable di- on of their flight. Tests have shown not more than three minutes are re- «| to inform all officers in the county e on the lookout. Bridge tenders, watchmen and others are included he same telephone broadcast, being rn in as special deputy sheriffs for emergencies. PHONOGRAPH UNIT CHANGES ITS OWN RECORDS automatic phonograph unit, built to nto standard talking-machine cabinets designed to play any number of rec- up to ten, changing its own records playing the program over and over stopped, is now on the market. It be used, in connection with a radio or a radio amplifier, to convert old- e talking machines into the latest thing electrical and automatic phonographs. Up to ten or twelve- inch records are carried above the reproducer on three supports and low- ered onto the turn- table, one at a time, until all have been played. A selector switch is provided so that any prede- termined number of records can be played, id the machine will then stop itself. NATURAL GAS RUNS ENGINES IN AUSTRALIAN TOWN Natural gas, discovered in Roma, Aus- ralia, during a search for oil, is used to perate engines as well as for lighting. here is an apparently inexhaustible sup- of the fuel, which is delivered at pres- ures varying from 320 to 480 pounds to le square inch. Valuable products are btained by filtering the gas and the ex- \ust as it comes from the engines. POPULAR MECHANICS 975 Miniature Lantern-Slide Projector Used by Schools in Nature-Study Classes MAGIC LANTERNS ON DESKS HELP TEACHERS Lantern slides in small boxes, contain- ing an electric-light bulb, are employed in a New York schoolroom, to help teach the pupils about nature. Each box is like a little picture theater, the slides can easily be taken out and new ones inserted, and the children have a better opportunity to study the subject than they would, were it shown on an ordinary screen. After examining the slide, the pupil is re- quired to write an essay about the picture it reveals. BALL-BEARING AUTO SHACKLES ELIMINATE SQUEAKS To eliminate squeaks and rattles, and to make the car ride more easily, ball- bearing auto spring shackles have been introduced. No ad- justments are re- quired, and a spe- cial advantage claimed for them is that no greasing is necessary, as per- L manent lubrication is provided, good for the life of the car and eliminating grease cups and fittings.

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Or 1/0 POPULAR Visors on These Spectacles Relieve the Wearer of Un- pleasant Strain as They Shade the Eyes VISOR GLASSES FOR AUTOISTS RELIEVE EYE STRAIN Sun visor, glare shield and driving glasses are combined in one pair of spectacles de vised for the safety and comfort of auto- mobile drivers and others who have to face bright lights. The upper part of the lenses is of a restful, transparent green shade and the lower part, a semi-smoked This portion When glass, clear. practically emploved while driving. the glare of headlights strikes the eves, the wearer simply lowers his head and looks through the upper half of the lenses. The pro- tectors can be worn in front of regular That the rate of changes from time to time and that this fluctuation may be due in part to the ef- ad- vanced by Dr. Benjamin Boss, of the Car- fect of « irthquakes, are possibilities He has found evidence for the apparent variation in a long study negie Institution. of star positions, and the change appears to be related to the frequency of earth- Further indication of the fluctu- ation is suggested by quakes. the fact that, when rotation | MECHANICS checking clock time with the stars, is a daily variation in the clock rate, s ing that the rate of rotation. earth may change its TELEPHONES FOR PLANES Passengers in cabin planes of a western air-transport company, may talk with pilots through a special telephone sy recently installed. Except while lai and taking off, occupants of the cabin permitted to ask the pilot questions « cerning the route and the position of ship. It is expected that the phone meet with the favor of the pilots, as of them find long air journeys monotor and welcome a call from the passenger BATTLESHIP HAS FIGHTING FACE CAMERA REVEALS That there is a sound basis for the ¢ pression, ‘ ‘in the face of the enemy,” speaking of war vessels, is seen by the companying illustration of the bow oi U. & S&S, The hawser | have the appearance of eyes and the resembles the teeth of animal. The effect is not so pronounce “California.” chor some all times, but is frequently noticeable f: certain angles. | | | Warship’s Stern “Face” to Challenge the Enemy; Bow of the U. S. S. “California”

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POPULAR MECHANICS 977 ‘re Musical Inst Pieces More Faithfully, MUSIC BY PHANTOM ORCHESTRA LATEST RADIO NOVELTY roved reproduction of radio and ograph music is claimed for the intom orchestra” an eastern inventor devised. It is an assembly of twelve instruments each one serving as loud speaker to reproduce the tones ed by a unit of the same kind in the | The important theory yperation is that each instrument will pond t of orchestra. to the vibrations tones it 1s PRONGED BAND TO HOLD JAMBS ELIMINATES NAIL HOLES Por ndows, she fastening the jambs of doors or ving and other installations, with reading prongs band end has introduced. one been t eliminates ham- er marks, puttying ae caer saves up nail ] jes and can be lriven in without splitting the wood. The prongs spread as they are forced in, in- uring a firm hold. The bands can be ruments, Connected to the Amplifier on Radio Set, Are Said to Reproduce Tones of the Original for Better Reception of Orchestra and Solo Numbers made to produce, that is, the violin as a loud speaker will reconstruct the res: and the cello, pi ino or other pieces will function in the tones of a violin, lo operate the wind instruments, a vib ing diaphragm is placed across the mout! ban piece. Music from the radio graph set or phon is amplified by vacuum tubes and then transmitted to the manles In a recent test of hat the timl » 7 1) pick il, l i 1 +} | yvre and individual tone chat acteristics of the various pieces were ren ¢° ed with aet remarkable fidelity more quickly applied than mails and con- sequently save both time nd work fo painters and carpenters, as well as for home mechanic NEW USE FOR RICE HULLS To facilitate of wet, sticky trucks, the dumping soils from automobile engineers, working on a grading contract in Cali fornia, scattered rice hulls, a waste prod uct, in the trucks. Being slippery, the hulls proved entirely satistactory and a light covering of them was found sufficient to cause the soil to start slipping out when the truck bottom was raised.

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sgh Father Francis H. Tondorf, of Georgetown University, America’s

Most Famous Earthquake Observer, with lis Exceptionally Sensitive Galitzin Vertical Seismograph will America’s next great nd wh + wil the THERE Wier ‘arthquake hit, a lamage be? In seismological laboratories sca tered Irom coast to Coast, patient « bservers are recording on smoked paper the earth tem blors of all the world in an effort to find nan ¢ to those t oO pre € l Che answer to the first he es pieces together ( the t11¢ ( é ch eal quakes the r pre e < 1S¢ nd ther dat ] cf) 1 € entu e tie riddle of | and he1 n ¢€ the ke S occur The answer to the secon epend gely on the use to which the countri put e solution of the f f mage | be lessened in direct proportion to the precautions taken in ¢ irthquake ZONE to build shake proof houses and offices. One of the dozen greatest earthquakes of all times occurred little more than 100 vears ago in the heart of the Missis ippi valley, yet damage was very slight, sim- ply because the country affected was That was the New quake of 1812, formation sparsely settled. rid, Mo., sponsible for the which was of lake, in northwestern Tennessee, and for the sinking of all northeast Arkansas and southeast Missouri, a region still therefore, as the Sunken Country Last at the height of the Missis- Tre- Reelfor yt known, year, sippi floods, the same region suffered other quake, this time a slight did no particular damage. \ ] the blor in Lester Jones, director of t one, ame zone, according te ba 87 1e might down old and poorly constructed buil coast and creodetic survey, within that area. 7 7 that practically quake-p oot pul po sible wa cle Ion trated lurit great Japanese « thquake of 1923 ‘ id such enormous damage to Tokvo “7 ° 7 Y okohama Steel and concrete 1 Came t] rougn the <¢ 1 Lnce t] , damage e more flim structures fe ] n ruins and then burst into flames w pread into a new tt of destruction and not the shak i e fora great part of the loss of ng, 1S respo! life ‘7 property when a quake rocks a densel populated modern city. Stoves and ope hres spill live coals into the ruins, broker gas mains are touched off by chance sparks, and, at the same time, the wate: mains are broken and rendered usele As San Francisco found in 1906, onl dynamite and back-firing can stop a con flagration under such circumstances. The Japanese government took the les sons of that quake to heart, and rebuilt the destroyed capital along modern line Residential, commercial and industrial di: tricts were segregated, six great avenue

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4TInSs a firm hoid, ihe bands can be t! ie truck bottom was raised. the portions of the 1 122 broad streets “la maze of narrow ng allevs. Parks itted over the city as ee centers, three large nd fiftv-two smaller ing T] inal cs ne tinal surve' opened for the qu ike showed the } irative loss from ] 1 i ocks and fire, even 1 +h e conditions pre- in the old capital, re buildings were down with ease. The number of sant, Mo., near the New Madrid “fault.” totally destroyed by the quake was The Jesuit fathers are the most numer- 6, while 447,128 structures were ous earthquake observers in the United ed by fire. States, and probably in the world. Their e year 1925 was notable for a num- universities have seismographs scattered t fairly strong shocks in the United all over the country, with the center of tes and Canada, as well as another de- activity at Washington, where Father e quake in Japan, and out of that fondorf, of Georgetown University, is activities grew the present earth- usually the first to announce each succes- ke survey being made by the Carnegie _ sive quake. ution, the coast and geodetic survey That there is a relation between widely the Engineering-Economic Founda- — scattered disturbances seems certain. The The same year saw earthquake in- best explanation of their cause is read- ince established in the United States, justment of the earth to relieve the strains h the Woolworth building insured for and stresses of internal pressure. The 00,000. The survey so far has been car- crust slips and slides, sometimes in a lim- out mainly in California, with both _ ited locality, and again over a wide are te and federal governments co-operat- The Montana quake of 1. June 27, 1925, Another survey has been started in while severe, did not cause any vast dam Mississippi valley, where Dr. James age, aside from loss to the railroads whose \McElwane, S. J., president of the Seis- canyon tracks and tunnels were damaged logical Association of America, has to a serious extent ened a new recording station at Floris- Two days later, and hundreds of miles 979

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hvah YN, GAL LEILD FILER TE Wi t8ity savVsboodio= terwLten wweaesdr Vee FN oy CAEN Se Elum EU ECU ULDU JOU POPULAR MECHANICS “black bottom” i: vicinity of norther: f England, just as she in February, 1925. Late last fall, repre atives of twenty-nin tions, meeting at | Czechoslovakia, proy a plan whereby the terious ocean canvo1 “deeps,” are to be p1 soon in order to their possible conne Y with eartl quakes reaching and deep et the canvons. The A tian deep, largest Pacific, extends for miles and is five deep. The Nares largest in the \t = lal ls more than five 1 the coasts of Java and Sumatra. $ three-fourths oft world’s eat their cradle in the s« the probe should rreat importance Watching Quake the Pacific Coast; Prof. J. M. J 8. J Gonzaga eismograph stat ers Spokane, Was! e established a1 O ¢ outhwest, i o=#&B ( ed, so if en a « (a ted hb dect ‘ we t¢ p ‘ p tion! e deter? ne or, with further she the ollowit Also t i Pro Akitune { x i B ( e¢ 1 ¢ the | oO | eT | [ eT I rea San Andre t t rs ( nounces Pre | », one 600 miles through the Coastal range, p colleague had developed an instru ng just west of San Francisco, east of Le called the clinograpl vhich is Cc Angeles, and, finally. an indeterminate dis of producing an earthquake irnit tance into the Gulf of Mexico. The great ——— ie quake of 1906 occurred along the San At areas rit taking in a stretc] of some 15 a8 les \\ ith san | Tang co ne T the cente d vay { One side of another well-known geolog SS. ical fault extends approximately along =—re the line of the Hudson river. There is the Coie a i ——t possibility that some time during the Ice | =the \ge the New York side slipped under the train of a terrific tremor. However, to- day the geological position of Manhattan island and the surrounding territory is —_—————. such that about the only danger of even a slight quake comes from the fact that _ —— Series of Wavy Lines across the Seismograph Char Mo or «Fart cide ] 3 ° lother Earth may decide to do a mild Marking the Vibrations of a Distant Earthquake

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Hea a new recording station at PFloris- 1WO days iater, and hundreds ot POPULAR MECHANICS 931 yyy 3 oye eee | N A . fA ; igs Y a Ys ‘ Ate oe d Yip Yy' = - pty YY) 4 / Dy) A 444 WV aa yy 4 Ys f Yy ; 4s VA fh fb r rr VA % Uy yp | typ, Y ips, MYvyyhgp Wy ,, Yi , | 4 5 ZY 4 ; , | A UM | } r | ; f VIDITAS SY Ahoy ‘T/, Y Yh | \/ | i | . F THE UNITED STATES ? -) EARTHQUAKES OF MODERATE FREQUENCY ano MAGNITUDE |__| EARTHQUAKES RARE OR UNKNOWN EARTHQUAKES FREQUENT, SOMETIMES DESTRUCTIVE eteeee Pie | WM quake zones = he shock itself. Prof. Imamura ted out that a short time before earth tremor occurs, a slight tilting he earth’s surface takes place. The ograph’s function is to detect this. he movement in America in recent urging the serious study of the of ea quake-proof construction is, ter all, ‘tho from the e earthquake menace has been pres- rth an e& ancients. ever since the world bega 1 cooling Pharoah Cheops, who achieved id at because he wanted a il resting place that would withstand of earth tremors. For a ilar reason, the Mayas Central erica built pyramid-shaped temples imous pyram Gizeh, without built it l subt ravages of unusually thick walls. While earthquakes are sure and inev ble as the daily rise of the sun. it is ginning to look as if man, with his er-increasing knowledge about them, iv one day win in his battle with the ‘nturies-old menace. Earthquake Tondorf Studying a Quake Record; Map of River the United States, and Father the Black Spot at Marks the S cene the Mississippi-Ohio of the New Madrid Junction Disturbances

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982 POPULAR CASHIER TRAPS BANK BANDIT BY RAISING HANDS Raising the hands at the command of a bank bandit, proves costly for the Pun Cashier Obeys Order of Bandit, and as He Raises His Hands, Alarm Is Sounded; Relay Unit at Right , ! ith an alarm svstem an eastern in entor has introduce As the cashier ‘ ms ts his arms, his hands, coming close to ] tT} vA ] rp ? 7 t | oad on € i create one c dis urbance which causes electrical relays to function and operate an alarm. The sig also repeated at police quarters to sum- mon aid. The apparatus is hidden from the bandit, hear the alarm, he is not likely to molest his victim long as his orders are and as he cannot obeved., TELEVISION LINKS SHIP TO LAND IN SUCCESSFUL TEST like to be halfway ocean, perhaps a bit out of and then suddenly see the best friend smiling at you from a screen? Such thrills may be the common How across the would you sorts, face of your lot of ship passengers in the near future, for television already has linked the liner “Berengaria” with land in this way. Stan- MECHANICS ley Brown, chief radio operator of the ship, enjoyed the thrill of his life whe: he saw the face of his fiancee, Miss D Selvey, on the test screen with which tel vision experiments were being conduct She was in the br casting studio in Lor many miles away, but recognized her distin even her special way dressing her hair when she turned so her profile came in \ too, identified | Johy inventor of the others, According to Baird, paratus used in the t it is now only a matter time until one-half of 1 world will be able to as well as hear what other half is doing. | 1 that the dav is not far distant Atlantic w all sorts of pet formances, such as games, and believes when persons crossing the be able to see, in colors, parades, meet ings other events worth recording that may be happening on land thousand of miles away. @ Those wishing further information o1 anything described in the editorial page can obtain it by addressing Bureau of In formation, Popular Mechanics.

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POPULAR MECHANICS 983

e COAL MINED WITH FROZEN GAS e1 AS POWDER SUBSTITUTE rked reduction in coal mining haz- seen in the development of a for extracting the coal by means zen liquid carbonic gas instead of lvnamite. While the method is still experimental stage, engineers believe has great possibilities. The liquid + cont l 1ined in a steel shell, is inserted four-inch hole, drilled in the coal. ipor is far below the freezing point a pressure of 2,000 pounds to the 1 nch while in the shell. By means

n electric fuse, the temperature of the raised to a point where the pressure reased to 20,000 pounds to the square \ plug of softer metal in the shell iy at this pressure, and the gas

es out, breaking the coal. Experts ; , ut, breal ng =P > I : Window in Umbrella to Make Walking Safer on Rainy out that, if this process proves suc- Days; It Is of Unbreakable Transparent Substance it v <geringh ro ai the actual WINDOW PANES IN UMBRELLAS of getting the coal out TO PREVENT ACCIDENTS GREENHOUSE RUNS ON WHEELS _ Persons carrying umbrellas are pro AND PROTECTS PLANTS a ee oe ee pee trians and cars by a small windo trons of a London florist are served canopy. It affords a clear view raveling greenhouse which is driven the umbrella is opened up. even heir doors and the order delivered di held down in front

from under the glass. The plan apping and handling the plants STUDY BOWLING BALL’S MOTION ily, keeps them fresh and pro- TO IMPROVE GAME from unfavorable weather, and the t of the auto greenhouse attracts at- Science has been making an analvsi , i ion as it passes through the Streets. bowling to determine the rate of speed the balls, how much the curve and other interest ing factors about them : Dr. L. W. Taylor, of Oberlin College, has d vised an apparatus wv nere by the passage of a bal is registered to the hun 1, . dredt ol i second it twenty-inch interval down the alley. A cata pult is used to propel the ball. From facts so far learned, some of the ac cepted theories with re

gard to a ball’s motion

have been found incor rect, but friction eems His Traveling Greenhouse Keeps Flowers Fresher and Is Attractive to vary with the speed

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OR4 POPULAR MECHANICS THIS AUTOMATIC AGE AND MACHINES THAT ] . In This Automatic Age, Machi: ery Is Eliminating Personal Se: ice; at the Left Is a Machine That Sells Handkerchiefs in L don Subways, and Next, a New Device That Polishes the Finger nails, Two at a Time* } ’ | i . ‘ i} i | ‘ 1] i | ‘ | ay ispocsbineaaa ee } wi lll | F | } | | | il : a ‘ ; 4 ; » : sg & a i S | ; ee ; 4 pe a g Everything, from Counting Election Votes to Selling ; Merchandise, Can Be Done Quicker and Better by Ma- chinery, Releasing an Army of Workers for Other O cupations; at the Left Is a Voting Machine Used i: f New York; with Its More Than Human Intelligence ; It Receives the Votes of the Electors and Totals Them if Up as It Goes Along, Eliminating the Long Nights of , Costly Hand Labor Entailed by the Old Australian Ballot System; Above Is a Machine for Dispensing Several Different Brands of Cigarets; Anything Sold in Ready-Prepared Packages Is Easily Merchandised by Machinery; Many of the Automatic Vending Ma- chines Are Triumphs of Ingenuity, So Perfectly Built They Will Reject a Slug and Even Return a Badly Worn Coin; Others Will Take Coins of Various De nominations, Deliver the Merchandise and Return the Correct Change, as Well and Quicker Than a Clerk

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.T POPULAR MECHANICS 985 REPLACE HUMAN HANDS AND HUMAN BRAINS n trical Robot That Takes Orders ov the and Then Executes Them, Is S} ling a Statue of George Washing- Started a Fan and Cleaned Floors ; CHANGING MACHINE ee eer Mere es so Even Change Can Be Made by Machinery as Well as by a Cashier; the Machine Above Takes Different-Size Coins and Returns Others of the Proper Size to Fit Vending Machines; at the Right, an Automatic Telephone-Call Recorder That Takes Messages While You Are Away

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O86 POPULAR MECHANICS — = | ) T ; : | fi i y ; fi | } 4 ; | fi ~ oo j i ! iii yy | | / ' / 1 j Bd - — © 7 «* . distine ie t ‘ ie...

Football Game in Progress on the Roof Playground; the Space Is Also Used for Tennis and Cricket, an Proves a Valuable Feature of an English Settlement House ROOF SERVES AS PLAYGROUND FOR FOOTBALL AND TENNIS football are nglish settle- Rugby Tennis, cricket and ) . played on the roof of an E ment house. A screen over and about the prevents the balls falling to the street, and the space is large enough for a number of players at one time. area from EXTENSION LIGHT CORD IS FLAT TO FIT UNDER RUGS Longer wear for the cord, improved ap- pearance and less wear on the rug or car- pet are afforded in a rubber-insulated ex- tension cord that is flat instead of round. There is less tendency for the wires to geome et eae tos oe pose tospaconecanoeane SS A AS SAMBB BaORSH,

ow ok Electric Cord in Form of Flat Tape Slips under Rugs with Little Trouble and Decreases Wear break and the material is suited for nection with <inds as well as for floor lamps. electrical appliances Ol FAULTY TESTING OF AIRPLANES ONE CAUSE OF CRASHES Army test pilots deliberately try wreck the planes while they are in the ai in order that the severest tests possib may be applied. By the time the t1 flight is over, the tester knows practical every characteristic of the ship. Eng land and Germany both testing bureau for commercial planes well have a spec as military ships, and the establ: ment of a similar institution here has been recommended. It is believed that failure to give the ship an adequate test is one explanation of the mysteriou crashes that occur in planes thought to be entirely safe. Not long ago, a Mexican pilot, flying at high altitude, in to penetrate fog and clouds, nearly fell to his death when the ship. stalled and plunged into a tail spin. It fell 5,000 feet some of an effort

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POPULAR few seconds, the descent being so id that the pilot was pinned against side of the fuselage and almost unable Sut at 3,000 feet, he managed ring the plane out of the spin and con- ued his journey. The structural parts the ship withstood the fall without dam- e, but its tendency to spin had not been covered before the flight. move. MOTOR SAWS THAT CUT STONE SPEED CATHEDRAL WORK drills and planes re used in cutting stone for the modern iilding. How they time and ex- nse is illustrated in the work now being me on the Washington cathedral. The lilders’ specifications call for more than 60,000 blocks, unds apiece. The plain ones cost ap- oximately $10 each and the more elabo- te $300, while many thousands of molded d carved Motor-driven saws, Save weighing from 300 to 500 costing from $50 to As each block cut and shaped, it is given a number to rrespond with that on the blueprints. iilding the stonework on the cathedral thus simplified, the task being some- at like that which pleases the child— ting blocks together. stones, 00 each, will be required. ELECTRIC DRILL POLISHES AUTO WITH SHINING DISK addition of a patented disk to the ectric drill, an effective polishing unit for j “ the quickly The By the

automobile is formed. will fit any drill chuck up to inch, and is used in con- nection with a rub- bing compound and water, to loosen the grime and dirt. <A lus- disk one

L trous surface is the result of the treatment, at a minimum OT hand labor. @ Write our Bureau of Information if you wish to know who makes or sells anv article described in this magazine. Send no postage; the service is free.

MECHANICS 987

Indian Profile Formed of Cigar Bands; a Londor man Makes This Unusual Craft Her Hobby PICTURES FROM CIGAR BANDS FORM UNIQUE GALLERY the oddest to be a London woman Wo- One of picture galleries in the world is found in the home of who has been collecting cigal bands for the last twentv-five vears and l making other them. portraits Her showi1 150 pictures, and the designs from ° includes they are fashioned came from cigat smoked bv famous Englishmen ; in all parts of the world RAPID PHOTO-PRINTING PRESS ELIMINATES TRIMMING Operated on the same principle as a job-printing press, a rapid photograph- printing unit causes the nega tives to register with a uniform margin on the pa per so that trim- ming the prints is not necessary

Paper is fed on a platen and, with pressure of the left is brought in contact with the mask and negative. hand

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Y88 POPULAR MECHANICS ULTRAVIOLET RAY “DETECTIVE” level along the mountain or whatever REVEALS FORGED CHECKS ject he is studying. The instrument with photos taken from the ground a as-from the ait FOOTPRINTS TELL OF ANCIENT’ LIFE IN GRAND CANYON Slabs bearing the imprint of reptile marks have been found in the Grand von of Arizona, about fourteen mile the site of previous discoveries of kind. They correspond with other tr already uncovered, but further study have to be made to determine 1i match exactly. In all, some thirty-six cies Of animals that lived many thousar of years ago, have been identified by me of these imprints. An estimate as to tl 1 age is made by the character of the soi which they are found Witr Pent Checks and Other Articles Are Detected |CONE-SHAPED ICE-CREAM STAND ATTRACTS MOTORISTS Further practical use for the ultraviolet ravs has been discovered in the field ot \ conspicuous roadside feature alot minal investigation. With a specially motor highway, near Los Angele constructed instrument, the rays can be refreshment stand shaped like a huge ade to reveal torged checks, counte cream cone one exclusively are feit money and other fraudulent art! here and, besides affording a1 t cles, including adulterated liquors. TT] display, the booth e cted is accomplished by the peculiar reactio helter and to shed rain of the rays on roreign substances of va a -_ riOus KINAS as ¢ pared to Cir €1rect oO | ' renuine and ordinarily used materia — MAGIC DRAFTSMAN TRACES MAP | DIRECT FROM PHOTOGRAPHS ' What experts declare will be a great aid to the aerial surveyor, and others, is a | | instrument that 1 arawing reproduces an accurate contour map from stereoscopic photographs. The photos ire observed t] rough special eyepieces, with the result that an apparently solid model confronts the observer. A floating mark is then ma nipulated, seemingly in contact with any part of the scene, and its movements are automatically registered on a sheet of pa per on the drawing board. The operator, using the elevation above sea level from which the photographs were taken, as a starting point, may then adjust the float = To Catch the Eye of the Hungry Tourist; Refreshment ing mark to any desired elevation, say, 1,000 feet above sea level, and trace that Stand Shaped like Ice-Cream Cone

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POPULAR MECHANICS 989 j ; 4 se : | cp ae , 4 « Loading the Flying Ambulance, and In- terior View of the Stretcher Compart- ment, Showing How It Is Fitted as a Small Hospital AIRPLANE HAS DOOR IN NOSE TO SERVE AS AMBULANCE Speedy and comfortable transportation of sick and in- red persons from Istricts 18 outlying afforded in an air- plane ambulance introduced in ngland. tient, on a tretcher, is loaded through a door in the ao ; ihe pa nose of the plane and thence back into the cabin vhere cots are provided. This saves difficult lifting and mov- ing, and the smooth ride 2 ee * eerie Ba through the air is far less likely to injure the sufferer than other means of transport SHOES OF OLD AUTO CASINGS GIVE LONG WEAR Peasants and others in Mexico and Gsreece have found another practical use for old automobile-tire casings, by con- verting them into sandals. The demand has become so great that, last year, more than 50,000 casings were imported at Sa loniki, supply was 1n Greece, alone, because the local ufficient. In Mexico, there are enough automobiles to provide the The tire shoes weat those better pr material. from four to six times as long as made ot hide, against dampness and also. offer tection A durable portion of the casing is cut off, and straps attached and bound about the feet. One tire will make at least three pairs of sandals.

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Strainer That Can Be Removed from Its Frame, Simplifies Cleaning and Is Especially Suitable for the Steam ing of Foods Cabinet for Electric Refrig- eration Has Bright Dome Light Inside, Controlled by Toggle Switch; Door Closes Tightly by Pressing It with Elbow, a Convenience When the Hands Are Full Electric Heater of Spe- F cial Alloy without Re- F sistance Coils, Begins 2 to Heat as Soon as It » Touches Water bie. Metal Hamper, to Hold Laundry in Bag; It Is Well Ventilated and Supports the Contents by Four Snappers to Simplify Removal Rotary Cutter for Vegetables or Meat Is Easily Cleaned by Removing the Clamp and Tak- ing It Apart 990

Page 117

avin Jhings@® or the 1p 74 Ss ae . “nga ay) b safe Pot for Boiling or Steaming Ap- Has Easily Removable Inner Compartment, to Drain Off Liquids, and Side Handles Sim- plify Manipulation; It Is Made of Aluminum and Special Lift- ing Hook Is Furnished Double Electric Outlet for Table pliances Is Handsomely Finished and Prevents Tangling Cords Flexible Tubing and Clamp, Eas- ily Attached and Safe, Hold the Baby’s Bottle Securely and in Convenient Position Candle-Shaped Electric Bulbs Give the Effect of a Real Flame Drying Racks for Golf Hose Help Preserve the Articles, Keep Them in Shape, Prevent Shrinking and Are Suited to Hang in the Locker

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QQ? POPULAR Where Bundles of Paper Money Are Quickly and Ac- curately Counted by Machine BANK’S PAPER-MONEY COUNTER SAVES TIME AND LOSS To count packages of paper curf@ncy sent to the federal reserve banks, pesenst- tive apparatus that sorts certificates with greater accuracy and speed than would be possible with human hands, has been used with great success. Since its instal- lation, it has never made a mistake. It is O adjusted that if two bills are passed the difference in thick- At the aratus again through together, ness causes the machine to st p. end of each 100 count, the ip] MECHANICS in the laboratory, according to Dr, \V liam D. Coolidge, inventor of the X tube now in general use. The predict follows his successful development o 900,000-volt cathode-ray tube in wi! electrons are the rat 175,000 miles a second, some 350,000 1 \ shot along at faster than an army-rifle bullet. The ing electrons are emitted through a met ten-thousandth of an lead window, thick \ ° 4 vided to shelter observers from the str one telephone booth is | be iVS produced when the electrons st1 a target. This “super-power” tube ninety-five inches long and has three bu inches in speeding from the first, twelve diameter. Electro are accelerated the introduction of a high-voltage cu into the second bulb. The process peated in the third, until at effect of 900,000 volts is the end, obtained. i Coolidge believes that much higher \ ages can be used without serious difficu It has not been possible to imitate rad ti aaratl a omni — | ions With complete success radia l] of the u tube bilities, Dr. out that the rays can be controlled, s thing that cannot now be done wit! dium, as e of insufficient voltages. new opens a vista OT alluring Coolidge scientists have no physical that affects either quality or the quantity of the output! chemical agency radiations from radium. Chemical, t] 1 peutic and other uses for the rays w developed, Dr. Coolidge believes. locks automatically until another package is put in. Bills unfit for further use are sorted and, if there is a shortage or excess num- | ber in a package sent to tact One of the bank, the is al- ways revealed. the machines has paid for itself, as any shortage is charged to the bank send- ing the money. MAGIC TUBE RAYS EQUAL TO TON OF RADIUM tubes, radiations equivalent to those of a ton of radium, worth High-voltage giving off $56,000,000.000 at present prices, may be produced View of the 900,000-Volt Cathode-Ray Tube: Note the Three Bulbs, Used t Step Up the Speed of the Electrons

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By SAM BROWN } YLKS, let me introduce my friend, Mr. placing the pencils, one at a time, to your Pencil. “Persistent Graphic,” I eall forehead psychic stuff—it is a simple him He has been after me for several matter to pick out the villain by hi onths—wants me to give him the lead patchouli breath role in a magical article, promised me For this next one you must take a knife ed keep his long nose out of things and and raise a tiny projection on the metal try to be pleasant. Well, I’m human. Sit end of the pencil, as shown on page 994. lown anywhere and see how you like his Does that suggest a trick to vou? No? how. Listen he performer passes out several pen The performer takes | penc cils to the audience. All the pencils are ‘This pencil,” he explains, “is gifted with is alike as peas ina pod. Addressing one wonderful magnetic powers Wonderful ot the spectators, the performer requests magnetic pow him to initial the pencil he is holding. The lo prove his point, the performer pencils are then collected in a hat. The the pencil flat on his hand. He turns his performer is blindfolded. hand over. Does the pencil i off like The trick is to pick out the initialed an ordinary pencil? It does not! It is pencil.. It’s easier than it sounds. One’ the wonderful magnetic pencil. It hans the pencils has been previously dipped on! What does it? The little raised pro in perfume. The performer must watch jection on the end of the pe Phi here this pencil goes, and ask the person catches on the s! ( t clot holding it to mark it with his initials. In wherever it is applied, and does the trick

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994 POPULAR MECHANICS \fter two or three experiments using this tiny hook, the performer drops the pencil on the floor and rolls his foot over it. “This,” he states, “is to give the pencil more magnetic power.” But, don’t believe him! What it really is for is to roll the little hook out flat. To show how magnetic the pencil now is, the performer makes it cling to his finger tips. Without the hook? Simply hold it as shown in the photo to the right on this page, pressing down with the second and third fingers and out with the fourth and first. A variation of the magnetic pencil trick, which always mystifies, requires two pen- cils, exactly alike. Get a pair with plain ends—no erasers or metal caps. Sharpen them to the same length, lay one aside, and you are ready to prepare the other. Take a common pin, cut off a half inch, measuring from the point, and sharpen the cut end, so you have a piece of steel, half an inch long and pointed on both Sure! The Magic Pencil and the Hook That Turns the Trick sixteenths of an the palm. Push ends. Now bend it about three- inch from tl] t original point, and, with a sm hammer or other weight, dri the newly sharpened end of th: longer leg into the top of tl pencil, about midway between t! lead and the edge of the wood. Holding the pencil in one han cup the other by bending t} fingers upward at right angles t he pin point through the loose fold of skin i: the palm of the hand, and you are ready for the demonstratio: So long as you keep the finge: slightly bent the pencil will lic flat along the hand, but the mo ment you start to straighten then out, the fold of skin is stretched taut and the pencil begins to rise Here is how the effect work “I have here a couple of ord nary pencils with which I car demonstrate the power of stati electricity over graphite and woo I will pass out one pencil and you can follow my motions and prove for yourself that it really works Place the butt of the pencil at about the palm of the hand—so and allow the length of it to along the fingers. Now rub the other hand briskly over your coat sleeve, just as I a1 doing, to gather a charge of static. Then pass the hand above the pencil and watch it come up.” Making an Unprepared Pencil Clin Is Easy, If the Fingers Are Bi to the Finger Tips aced Just So

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POPULAR MECHANICS 995 ‘ \s you pass the “charged” hand above the other, you slowly straighten the fingers the pencil slowly and smoothly rises it stands erect on the palm. As the rge wears out, you can let the pencil wn by bending the hand, and then re- ‘at the process. The pencil can be re- ved at any time, and often can be passed round for inspection without the pin int being detected. ‘ir. Pencil is.assisted in the next effect a playing card, and an envelope just large ugh to hold the card. The card is placed in he envelope and the en- elope is sealed. The pen- | is then thrust com- letely through the en- elope and card and ulled out on the other le. And, yet, when the velope is torn open, the ird is found intact and nharmed! Darn consid- rate, this fellow, Pencil! The Pencil Can Be through the Envelope, at the Left, without Damaging the Play- ing Card, For the Card Has Slipped Down through the Slit End and Is Concealed within the Palm of the Hand While the Puncturing Is Taking Place 3efore- ind you must carefully slit open the bot m of the envelope. This is simple. Now yourre all set »go. Place the card in the envelope, be- ng careful not to push it through the slit- open bottom. Not yet. Hold it up for inspection. Then take it Seal the envelope. in the left hand. Allow the card to slip halfway out of the envelope, concealing it with the hand as shown on this page. Do the “Indian Basket” jabbing feature, pushing the pencil through the en elope immediately above the card. Remove the

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996 POPULAR MECHANICS

With a Black Tissue Tubs to Cover the Penc!!, and a Pair of Envelopes, the P« former Can Stage a Vanis! ing Act That Will Mystify the Audience; the Pencil, Slipning Out of the Tube Is Concealed in a ip- posedly Empty Envelope While the Tube Vanishe into the Wadded Paper Si posed to Hold the Pen

——— a — BLACK PENCIL - << —

BLACK TISSUE-PAPER TUBE PUTTING THE TUBE OVER THE PENCIL P< ’ tenes = KL pencil. Slide the card back into the —_

envelope, and tear the envelope open along the edge that is already cut. Remove the card. And there you are! The performer exhibits an ordinary pencil and two long envelopes. One of the envelopes is shown to be empty

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POPULAR MECHANICS 997 Passing a Pencil through \ a Loop, Much Too Small for It, Is Easy, Once \ You Learn How the \ Trick Is Turned \ er placed at the far of the room. | Qa the remaining fy envy elope the per- - former slips the pen- ’ > Presto! The en- ope apparently ntaining the pencil crushed flat in the pertormer’s hands, hile the pencil is und intact in the other envelope. The how of this effect is found in a pa- er case open at both ends, which fits over e pencil proper, as shown on page 996. e a black pencil and make the case by rapping four or five layers of tissue per around it, and then neatly pasting e outer edge. When you pick up the first envelope, run the pencil around in- le to show that it is empty. It is an matter, when doing this, to release he real pencil and let it slide into the en- lope. The envelope should be of suf- ient stoutness so as not to show the out- ne of the pencil. The case is then ropped into the remaining envelope, and but why explain further? The crum- pled-up envelope is, of course, tossed care- lessly away out of reach of the audience. This next one is called the “Flexible Pencil.” Cut a notch around the end of a pencil and tie a short loop of string to

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998 POPULAR Making One Line in the Palm Grow into Two, While Another Vanishes from the Back of the Hand it, as shown on page 997. The loop should be about half the length of the pencil. Now, if you will put this loop of string through your buttonhole, you will see how obviously impossible it is to put the other end of the pencil. through the loop and thus fasten it to your coat. 3ut it can be done! Turn your back to the audience. Pull a piece of your coat through the loop, then place the pencil through the buttonhole as shown in the center and bottom photos on the same page. And there you are! Say, I'd almost forgotten. Pencil’s wife, Mrs. Pen, is with him tonight and she’s standing over there in the corner all by her lonesome. A _ wallflower! can’t have this. The performer borrows a fountain pen. He draws a line on the inside of his hand. He closes his hand. He makes a similar line on the back. Then with a handker- chief he rubs off the line on the back of his hand. But too late; a Say, we the line has already gone through, and the performer shows the two lines in the palm of his hand. This one is almost too easy. Make the line on your palm one of the large creases, as shown on this page. Use plenty of ink. When you close your hand, the line will across automatically ing H MECHANICS Different Applications of the Clamp and Block, Show- i ow It Is Adapted to Many Tasks duplicate itself as shown at the right. The sinking-through business? That’s all ap plesauce! MECHANICS’ CLAMP AND BLOCK SIMPLIFIES SMALL JOBS W ork on small pieces that are difficult t hold is often one of the most bothersome tasks for carpenter or mechanic, but the labor is lightened by using a combinatior clamp and block recently introduced. It is suitable for home bench or machine use and is adapted to a wide variety ot articles. For in stance, it may be employed to hold small! pieces of iron for bending, lengths of pipe, rods, flat pieces for drilling holes, and for many other purposes. The unit is of steel and occupies little space in the tool box.

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rN POPULAR MECHANICS 999 EGYPTIANS BEST GLASS MAKERS OF ANCIENT CRAFTSMEN Glass makers of Tut-ankh-Amen’s time before, were the most skillful of all ancient craftsmen, according to a Ger- n professor. He has made a number of ts and analyses of samples of old glass inufactured by the Egyptians and the ‘omans, down to about 850 A. D., and found that most varieties had one mmon fault. There was too much alkali the mix, resulting in a product some- it too soft, with lower resistance to rrosion. One reason for this was that e wood-fired furnaces did not develop a ifficiently high temperature without add- high alkali content to get the ingre- ents to melt together. From early times ntil the beginning of the Christian era, much glass was used for ornamental pur- ses and for jewelry. A wide range of colors was available, but the ancients could t make clear glass because they did not know how to remove the impurities. DISK GRINDER CATCHES DUST AND PROMOTES SAFETY For grinding a wide variety of small metal or wooden parts, a horizontal disk unit that is portable and operated by an electric motor through a lighting socket, is equipped with a bag at the side to catch the dust. In addition, it has a convenient support for the arm to expedite feeding, and the edge of the disk is inclosed in a hous- ing for the pur- —_—S— J pose of safety. ce rn en tenet en LETTER BOX SINGS AND TALKS TO ADVERTISE AIR MAIL Equipped with a radio loud speaker, a letter box in Cincinnati sings and talks the praises of the air mail to encourage persons to use the service. The box is placed in a conspicuous position in a pub- lic square and attracts hundreds daily. Ringing Bell to Announce That the Golf Course Is Clear; High Trees Make the Signal Necessary RING BIG BELL ON GOLF COURSE WHEN GREEN IS CLEAR Players on the golf links in Jasper na- tional park, among the Canadian rockies, are required to use a big-gong signal to inform others when the green is clear at a “blind hole.” This is necessary because of the trees that hide the green. SUNSHINE HOOD FOR AUTO TOPS ADDS PLEASURE TO DRIVING Fitted to the top ~~ of the touring car, a special frame unit has been de- vised which allows the driver to throw the front part of the canopy back to admit the — . — sunshine. It can be closed as easily, mak- ing it unnecessary to shift the entire top. It fits almost any movable top.

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1000 POPULAR MECHANICS is controlled by a squeeze-trigger valve It is effective at practically any angle, us¢ various kinds of dust and prevents tl formation of defective castings, as ji reaches every part of the mold so that burning on of sand is less likely to occur FIVE-MOTORED TANDEM PLANE TO CARRY TWO HUNDRED Tests are being made with a model of tandem airplane, planned to carry 200 pa sengers besides the crew, and to make no1 stop flights of 13,000 miles and more. is to be equipped with two sets of win five motors, three in front and two on th: rear set of wings, and will weigh 72,01 pounds. Tanks for 7,500 gallons of fue are to be provided. A cruising speed ( 100 miles an hour is expected with the five 400-horsepower motors. The inventor L _— ac arranced : omati. o P . - Spraying Mold with Compressed-Air Gun; a More Even ha arcane. d the « Fart o that » — Dusting Is Accomplished in This Way converted into a bombing plane in a te hours. As such, it would carry 35,00 oe.” pounds in bombs, he declares. An exper mental ship to cost $250,000 is proposed Economy of time and materials is the anda trip to Tokyo and Paris from L chief advantage claimed for a spray gun to \ngeles in eight days with a crew of eig! apply dust to molds in foundry operations. men is anticipated. The craft would have It is similar to the units employed for a fuselage 116 feet long, and a wing sprea liquids, being run by compressed air, and of ninety-six feet. es J Model of the Tandem Plane, Which, the Inventor Hopes, Will Be Able to Make Long Flights and Carry 200 Passengers; Three Motors Are in Front and Two Behind

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POPULAR MECHANICS 1001 Filament Control for A. C. Tubes Eliminates Power Rheostats n automatic filament-control device, a.c. tubes of the 226 and 227-types, is on the market. These tubes are ex- nely critical as to filament voltage and control unit will greatly prolong their It is designed to compensate for any tage or current fluctuations, due to in- iracy in transformer windings, line ce, or overload, that are likely to ten the life of the tube filaments. omatie control devices for the stand- d.c. tubes are now in general use be- e of their convenience in eliminating ostats where possible; the new a.c. unit equired more as an actual protective ice. No cumbersome power rheostats, tofore considered essential for these es, are needed with the new device. Midget Speaker Is Five Inches High \n interesting radio novelty in the form midget loud speaker, weighing only ounces, has appeared on the market. handy whenever small volume is de- ed and takes the place of headphones in h cases. The speaker also has many a _ possibilities as a , means of amuse- ment: being so small, it may be concealed in lamp shades or drawers, under tables and in other places where unexpected talking will puzzle those present. New Clip-Mounting Resistors Are Wire-Wound Wire-wound resistors of the clip-mount- ‘ type, in values up to 5 megohms, are ww available for the set builder. Of turdy construction, unerring accuracy nd ample current-carrying capacity, these nits are especially suited for plate-voltage culation. The fine wire necessary to roduce these calibrated units is one-third e diameter of human hair. It is claimed at the resistor cannot possibly break ywn and will outlive the receiving appa- itus in which it is used. Free-Edge Cone Speaker Installed in Cabinet Designed in Gothic Style New Cone Has Free Edge The new speaker shown in the photo employs a free-edge cone or floating pe- riphery. eliminating “nodal” or dead areas. The driver or connecting rod is very short and high efficiency over a wide range of frequencies is claimed for the instrument. Many of the low notes usually lost in speakers of the older types are brought out by the newer types now available, such as those produced by the bass horn, the ] bass viol and the cello. Preventing Charger Hum The usual bulb-type charger sometimes produces a slight hum, especially for the first half hour it is in operation. This may be elimi- nated by the simple method shown in the illustration. Four wooden spools are placed against the sides as shown, anda wire is drawn tightly around the case over the ends of the spools. This will reduce vibration to a minimum.

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oe ADIO - ' E.R. Haan wcToR te - \ SOME UNAVOIDABLE TROUBLES A LIGHTNING discharge in the imme- ™ diate vicinity of a radio receiver pro- More distant discharges produce irregular, fry- ing sounds. This is duces a loud crash in the speaker. static. Sometimes the air appears to be entirely void of sig- ials, although no abnormal evident in the receiver. noises are Static, then, in- tercepts radio signals and prevents them from reaching the receiver. This may be likened to the interception of a light beam by high waves, as shown in the sketch on page 1003. Such conditions may be local, existing in a small territory of a few square miles, or they may cover an area of several thousand square miles. Static is usually short or indoor aerials, or loops. Chet is really no method of eliminating stati at present, although some devices on the market are supposed to do this. the effects of reduced to some extent by shortening t! and connecting a condenser in ground lead. However static in a receiver can aerial small-capacit with the It is also a good idea to u series aerial or a fixed resistor and condenser across the aerial and which will tend to by-pass severe stat ground, as shown in Fig. discharges. You may have noticed, when a distat station is tuned in on a receiver, that t signal varies in volume, sometimes Leco1 ing almost or e1 inaudibl a (ltirely = put finally comin back again to its o1 SMALL FIXED iginal volume. T! CONDENSER iS called “fading and is caused ) varying atmos pheric condition between the receive! more troublesome i eC during the summer = months than during seated the winter, and it is also more evident in tropical and semi- _ RECEIVER tropical regions than farther north. Long aerials pick GROUND4 up more static dis $$$ turbances than = 1002 '» —- and the broadcast-

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II PWIA tation. Sometimes the signal strength e station varies, and this is mistaken iding. When this trouble is noticed, not attempt to increase the filament ent of the tubes beyond the proper rating point or to retune the dials, for ignal may then be lost entirely. ertain spots on the earth’s surface are rently impervious to radio signals, these are called “dead spots.” About of these have been charted in North erica, and they have usually been nd accidentally, so that it is probable there are many more. One of the rest dead spots is located a little south Hudson bay in Canada; another is over ocean off Atlantic City, and a third is he vicinity of Camden, N. J. There are imerous dead spots in Mexico and the ithwestern states. A map giving the proximate location of dead spots in Cal- rnia is shown on this page. Radio nals can be received all around these, the dead areas cannot be penetrated, en when receivers are placed close to eir boundaries. These phenomena exist on land and sea, but the cause of em has not yet been determined. Sometimes it is impossible, in a certain ation, to get reception on a radio set hich has been found to work elsewhere, id in such cases it is possible that the rticular location of the instrument is ielded from external electrical impulses, nd hence the receiver cannot pick up dio signals. This is usually the case hen a loop-operated set is installed in a teel-skeleton building. The steel absorbs ost of the energy and grounds it. Like etfects are often evidenced in receivers lo- ited in the vicinity of large deposits of metal in the earth. One of the most frequent interference tie AA hy G By) /| ke U4 MdaD POPULAR MECHANICS 1003 troubles is that experienced from reradia- tion of regenerative receivers. All re- ceivers, which feed back some of the plate current from one or more tubes into the aerial, either directly, as is the case with the ultra-audion hookup, or indirectly, as is the case with three-circuit tuners, are regenerative. When these receivers are operated improperly, the tubes oscillate and the aerial is charged with a high-fre- quency current, which is radiated in the air for many miles, and is picked up and amplified by all receivers in the vicinity. This interference causes either a steady howl or a whistle; or, if the tuning dial on the offending receiver is being rotated, “mocking-bird” whistles of varying in tensity will be heard in other receivers The trouble cannot be eliminated at the receiving end, although it can be reduced to some extent, but it can usually be ef- fectively counteracted at its source. As a general rule, it is caused by turning up the tubes too high. The use of a non- reradiating unit on the offending receiver is an effective cure.

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turbances than 1002 1004 POPULAR Homemade Ground Clamp That Grips Most radio ground clamps are adjust- able by means of a screw or bolt, and, in time, will slip or the one shown in the sketch, which can be made i min- But loosen. @\ BINDING POST f } in a few utes by any- one familiar with tools, is So designed, that, in position once on the water pipe, / Hotes For «it «Will st put, insuring Stay BY f ~ RIVETS rd A ~ oy a good, tight ko y A ground — mo. Se nection. lithe L l &E/ he * é , . 2" BRASS ORCoppeR —-Cltmp is to be ‘ STRIP 6”"LONG used around the usual 34 or l-in. pipe, cut a strip of fairly heavy sheet copper or brass, the size and shape indicated in the drawing. The main portion is 1 in. wide and the dis- tance between the two end lugs is slightly more than 1 in. Drill part, as shown, and fasten a binding post in the When completed, double over the lugs and rivet them together to form loops. Wrap the clamp about the four holes in this center. pipe and pass a large steel cotter pin through the loops. Then push the pointed end of the strip through the slot in the pin and turn it down. Push a nail through the eye of the cotter and twist until the metal strap is pulled tight about the pipe. Wire the nail to the pipe to re- tain the tension, and the result is a perma- nent ground connection. Inexpensive Radio Panels Ten cents is surely a low price to pay Such a panel can be cut from an asbestos shin- found to answer the purpose nicely. The shingle can be bought from any large lumber dealer, who usually will be willing to cut it to any size wanted. While this panel will require careful han- dling, it drilled easily even in Shingles may be obtained in several colors, and in contrast to black for a good 7 by 16-in. radio panel. gle, and has been can be critical places. mse.t MECHANICS dials give the panel a pleasing app ance. The dielectric effect is, perhaps better than wood for many radio purposes. but as a front panel for experimental sets. asbestos shingles offer a good substitute. Aerial Kinks of DX-signals is a swaying lead-in wire from t] Fading weak often caused by aerial. It is not a good idea to pull t! lead-in wire tight to prevent this, as the strain on the horizontal part of the ae: would be too great, but if an additio: insulator is placed as shown in the sket the lead-in wire may be strung as tight the horizontal section without causing ar strain on the The sket shows a simple method of bringing in t] lead-in wire without drilling holes in building. aerial lower Carefully untwist a few inch: of the aerial wire, separate the strand and lay them out flat. Wrap an insulating sleeve made of a thin strip of rubber from an old hot-water bottle, or se tion of inner-tube, around the wires fasten it with adhesive tape as shown. T] insulated se tion the placed on tl | SECURED TO EDGE OF is r ROOF a — ANTENNA vindow S TSS and the lowe: dh nig. sash close A j jie down tight j EXTRA ar 3 ; 4 suaawen over it. If n a | ' | STRANDS SEPARATED too bulky, t strip will 1 Ye || ANDSPREAD FLAT “, 4 1] NZ interfere wit! S27 THIN SHEET | RUBBERS, the closing — the windo a Another vantage bringing the this mennet no soldered connections that the the proper, upper sketch, is looped through the en of the and the lead-in wire brought down to the set without cuttin: it. One for the eliminates high-resistance lead-in wa that Note wire n2ece of tl are horizontal portion in aerial shown in tl insulator continuous wire entire aerial soldere connections; tant depend largely on at efficient aerial and ground. good reception of weak dis signals will

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Vne of the most trequent interference is an emective cure. Facts and Fads for Radio Fans

ng Radio Pictures on a Small Outfit ted at the Home of Dr. Alfred N. Gold- New York City; the Device Is Con- 1 to an Ordinary Receiver Much in the Same Manner as a Loud Speaker —— — ~ - wag ” oo . on ¢

Countess Bezzi-Scali, Wife of William Marconi, the Wire less Wizard, Operating a Com- pact Portable Receiver, the Only Duplicate of Which Is Now Owned by the Prince of Wales <

ve, a Radio Concert from the ids Was Heard in Los Angeles Vhen the Menge Orchestra Played in Plane as It Flew over the City; Right, Mr. E. T. Grossman Operating Device of His Own Design for the multaneous Control of Eighteen Mi- phones Located in the Auditorium heater at Chicago and Used in the Broadcasting of Operas

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ia ae ‘ano 43AIZO34N NO 1SOd “GND in ®: 13S GHINI 3eni “130 S1SOd dN-NIid HdVY9SONOHd WINNOISNVYL “V4 KA —ASt— SLINN @3774dN0D “2ONVLSIS3¥ FHL NI GIONTONI SYISNZANOD “G4W $00°=X JONVISISIY v7 TWddvl T cal 18 / SWHO- 0001 ,__ MOIWNITA-@ ONY AIadNS WIMOd Be et Se eS ee “A 00% +@ wINVIdS —\\. ; Ad +4) \ fi : 7 \ ) lt &)) 4 Ay 5 -i7 UINVIdS 8261 annr YAMIIdAV WNIdOLIaNV SOINVHOIN _YVINdOd 1349V48 e*

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S| Broadcasting of O peras Building a Perfect-Tone Amplifier Ultra-Modern Power Amplifier Furnishes Undistorted Volume for Radio Sets and Phonographs ‘T tone, at power-amplifier vol- P RFEC e, is available to all owners e looking for a means of improving receivers or wish to provide ampli- olume sufficient to take the place of rchestra for dancing parties. New opments in a.f. amplifiers and efficient devices have placed this e of reserve power within the reach ery owner. The combination resist- coupled and push-pull power ampli- well as the power-supply and B- inator unit, described and illustrated his article, are the latest ideas in this for the man who likes to build his FIGS HH map a - now et-power own. The power amplifier combines the advantages of a resistance-coupled am- plifier unit, used as a voltage amplifier (giving the most uniform response the a.f. range), with the excellent quali ties of a push-pull transformer-coupled power In this circuit the trouble- some harmonics generated in the ordinary stage of this type are neutralized and can cel themselves, the two popular types of a.f. amplification being employed in the manner in which each is most efficient. It goes without saying that, such as this, any old resistor, or transformer cannot be used; these in- struments must be the best obtainable, noiseless, accurate and permanent. The coupling condensers must be of suitable capacity with resistance of sev- eral thousand megohms, and the push-pull transformer of proper design; of types tried, those named in the list gave the best results. The resistance- coupled a.f.-amplifier units are of the com- over Stage. in a device condenser a leakage several material Power-Amplifier Unit, Showing Type Suitable for Installing in Radio Con- soles or Large Cabinet Speakers 1007

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1006 1008 POPULAR MECHANICS plete-unit type with the fixed condenser and 18 in. long. If a bakelite pan already installed. All resistors usedinthe selected for this flat layout, use the amplifier are specially selected for their panel brackets suggested, or short purposes, some being of the wire-wound dowel pins, to raise the panel so that type; therefore, in this particular item, of the wiring m the builder should follow the material-list If the builder desires a cabinet ty specifications closely. The power ampli- top bakelite pan

J

ay be hidden undern yp el will be “46 by 7 by Two side panels, ¢ by 1734 in., two panels, Hie by 3 by 7 and six pieces of wood, % in. square in. long, are required instruments, except five l-mfid. conden and the volume-cont unit, are mounted on t top panel exactly a fore. The photo of LMFD. |; L.MFD. |: ILMFD. LMFO. |} I.MFD. ‘voCumeE CONTROL! C5 C-4 |! 6-3 ‘C2 Cl rn L. 7) ee eee eee Fae

Fa. f-}-} — Q-Y \ ™~/ Scie \S\ | | |PHONOGRAPH |“) | PICK-UP POSTS | 4 te me \ y - —— DET. DET. P| B+ 7 , * 2 . | 7 as Top, Under View, Showing Sim- - r ———— a ple Method of Construction; Be- B+ A- B+ 2.5V. TAPPED 77 1.8.7" low, Top-Panel Layout and Sche- DET. P.DET. SET I35V. A.C. 7RESISTANCE B- B+ ( CENTER TAP) matic Circuit Diagram ff deoys 9”

l | fier may be built in flat, | |

or “breadboard,” type, or as a cabinet unit such as the one shown in the photo on page 1007. In either case, the instru- ment layout is practically

ONIN?

>F SS <= We = ; Ws

the same. The blueprint layout and wiring dia- 2000 OHMS gram show the instru- : WM ments assembled on I } { ~~ . ‘ IE either a board or a bake- * 1L.MFD. | 12,500 — OHMS imo| 15,000 OHMS : (.012) c-3 fools lite panel, 914 in. wide

100,000 OHMS (.1)

50,000 OHMS (.05

SPEAKER

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1007 POPULAR MECHANICS 1009

el js +} a I t SN 1 } > 3 es nd 3 1] tro the POWER COMPACT ye- € R- 210 the ann Tf Vea = "| Sear | 2 MFO. 2MFD 2MFDMFD] MFO ES 11S | | [wax Tr) 0.C. 4000.C.4000¢ \& Z iF A) PC) j WORKING WLV. WV is i is = j 3 VOLTS HiSitis| joi. w Is\1/8| 'S/Kas) Tis) is) is) 1 Onna TAP i © 2 2 ar ae Complete Assembly, with All Tubes in Position Ready for Final Connections; Lower Left, Power-Supply Unit and B-Eliminator, Showing Arrangement of Parts; | Diagram of Connecti leted cabinet unit shows the volume — grapl The first two heater-type tube on the panel at the input end. require 2.5 volts a.c. for the filaments; if ~ 1-mfd. condensers are mounted under’ the receiver is of the kind using similar top panel, as shown in the underside — tubes, this voltage is already available, but in page 1008, but the circuit is wired _ if it is of the battery-operated type, a fila- shown in the blueprint in either ment-heating transformer such as shown A schematic diagram is also given on page 1010 must be provided. Note he same page for those who prefer it. that transformers of this type also have he construction of the cabinet as well terminals for 1'4-volt and 5-volt filament ' f the layout is so clear in the photos supply, so that it is a simple matter to use diagrams that little further comment one of the standard harness arrangement necessary and convert the receiver into the a.c. type : No. 14 round tinned-copper busbar is if desired ) ed tor the circuit with the exception of Any good power pack designed for the e filament leads, which are standard UX-210 or CX-310 tubes may be used; ‘ible rubber-covered hookup wire, the high plate voltage necessary is 400 sted as shown in the diagram. Tape volts d.c., and a filament supply of 7.5 nnections carefully to prevent shorts, volts a.c. Ordinarily such power packs 7 use spaghetti tubing to insulate any are designed for use with only one tube a e busbar wiring likely to cause a short. of the 310-type; the one specified in the 7 Now that the wiring of the amplifier material list, however, will handle the fila it has been completed, we are ready to ment supply for both 310 tubes in parallel e our attention to the power supply. without undue heating. The power-sup- e designer has given a wide range of | ply unit is shown in the photo at the lower <ibility to the power-amplifier unit, as left on this page, and the simple wiring can be used with any radio set, either diagram is given at the right The dia ttery-operated or of the latest a.c gram 1s self explanatory. as all specifi i cket-power types, as well as with phono tions are given his unit provides ample

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1010 POPULAR MECHANICS power and is also a B-eliminator, supply- ground lead from the receiver must ing any other plate voltages required in the l-mfd. by-pass condenser in the receiver. with it as a protection against short A block of wood is placed between the = cuits, which may occur if both sick power pack and the condenser bank as a the A-battery are grounded, or support, the large, flat condensers being potentiometer is used for volume c a Al] necessary negative C-bias for thet in the power-amplifier unit are sup) by the resistors, and the plate circu stages one and two, being isolated + vent feedback, oscillation and moti ing. An additional resistor shunt push-pull-transformer primary, pre ing howling, while the CX-327 he tubes in the first two stages are comi: to operating temperature. The amp unit is free from a.c. hum except the power transformer of the B-elim or the filament-heater transformer cated very close to the push-pull t1 1 1elds of these tr formers at right angles to each othe: lo use this power amplifier proceed follows: Take the audio tubes out of set and disconnect the detector B ‘ ; , 7 wire from the | batterv o1 the elimi Filament-Heating Transformer; Pencils Point to the Run a wire from the plate of the det: Terminals Supplying 2.5 Volts tshe socket ta the binding post g ; bolted upright to this block. When build- detector P, on the amplifier unit. N ing this power supply, use wire sufficiently a wire from the B-battery or B-elimi: heavy to carry the current, and wherever using positive 90 volts on the detect busbar wire or bare wire of any kind is positive post of the amplifier, and employed, covet th suitable spaghett lead trom the B-positive 135 volts t insulation 135-volt post on the amplifier. Make Remember that all tubes must be in the other connections, such as ground sockets before the house current is turned filament-voltages, and 400-volt suppl on, and the power-supply unit must not shown. Keep the speaker cord be touched without first disconnecting the from the input; if it is possible ea house current. Never take a tube out of disconnect the P-side of the transfor either amplifier or power-supply units in the set from the detector plate, it unless the current is turned off; this also visable. A spade soldering terminal u1 applies to the loud-speaker connections, as the P-binding post of the detector-tu a very uncomfortable shock may result. socket will make a quickly detachable c The best rule to follow is to make all con- nection for the flexible lead going to nections and adjustments while the cur- detector P-post on the amplifier uw rent is off, and keep the device where small Note that when connecting the pows children cannot get at it. A double-output supply unit and filament-heating crat choke is used in the amplifier unit in place former to the 110-volt, 60-cycle, a.c. hou of the usual output transformer. Re- lghting supply, only one plug connecti ferring to the blueprint diagram, note that is necessary. Plug the power-supply un the B-negative of the power-supply unit into the socket provided at the rear of t is connected to A-negative of the radio small filament-lighting transformer set and al connect the 1-mfd. by-pass condenser just and connect it to the wall plug as shown in the diagram, so that the direct When the power amplifier is to be us so to the ground. Be sure to then take the lead from this transforme ground is only on the points stated. The for phonographic reproduction, the

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POPULAR detector and detector P-posts on are not connected to the set or to upply, but all other posts are left ted just as shown. Place a mag- ick-up device on your phonograph nnect it to the posts marked phono- pick-up on the amplifier. The of this unit is placed on the record same manner as the usual tonearm. the cord of the magnetic pick-up om the loud speaker, or distortion esult, caused by feedback between ut and output. risingly little trouble will be en red in building this power-ampli- ice, if the wiring is carefully spaced event interaction between the various its. One important point to watch is scket contacts, which should make t connection with the tube prongs. It od idea to bend the socket contacts her slightly before mounting the on the panel, as a poor high-re- e contact will cause no end of trou- d is hard to locate. Poor contacts oscillation and ruin quality. builder will feel well repaid when ears the tone quality and volume de- red, and the designer believes that he fe in saying that the amplifier will not ut of date for several years to come, robably the only important improve- ts will be in better tubes and speakers. e on the subject of speakers it is well ention that a power-amplifier device his type will give the best results on , of the exponential type, with an air nun of 5 ft. or more, or when used the new small type power-speaker nes. If the builder is not interested in ining quite as much volume and er, the 171A-type of power tube may ubstituted for the 310-type, and the change necessary is to supply 5 volts instead of 7.5 volts for the 171-tube ments and use B-batteries or a B-elimi- ir delivering from 180 to 200 volts. he complete list of materials used in original model will be mailed to any lress without charge, a postal will bring > to vou. A large blueprint of the circuit grams and layouts may be obtained for ents, to cover cost of mailing and pack- Address Popular Mechanics radio partment, 200 E. Ontario st., Chicago. ecify blueprint No. 133. MECHANICS 1011 lj | 4 H | | | py = ————— | | es 7) 2 _ | ae al | = INSIDE VIEW OF CABINET SHOWING LOCK ‘ | hes] i { Mn P i i a a q y} at —f . . ‘+ — yy. Radio Console Showing Battery-Compartment Door Open and the Location of the Safety Lock Hidden Lock for Radio Console The use of B-eliminators and power am- plifiers requiring high voltage and exposed wiring, often leads to severe shocks to the uninitiated who tamper with them. Small children especially almost always will in vestigate what they do not understand, and therefore I devised the hidden lock shown in the sketch. It is merely a wooden turnbutton screwed to the back of the power-compartment door, so that, when rotated, it will extend behind the center brace. To open or close this door, the hand is inserted through the othe: door as shown.—Harry G. Schultz, As- toria, Long Island, N. Y Comfort Pads for Headsets Radio listeners who use headphone often experience sore ears caused by the pressure of the hard bakelite surfaces when the phones are used over long peri- ods. Soft cloth pads, fitted over the phones, as shown in the illustration, and held in place with rubber bands, offer a simple relief RUBBER BAND and absorb moisture that might otherwise corrode the metal diaphragm

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ihe ESE valuable kinks have been written especially for zine by advice from t prominent radio experts. | he best technicians Cone-Speaker Kinks Most speakers of the cone type employ a holder or setscrew, with a small driving wire which runs from the actuating mem ber to the cone through a bushing. If this rod or wire is not in the exact center, the cone will not reproduce as it should. Tune in a good loud signal and loosen the setscrew; if the wire centers, there will be little or no rattling of the cone diaphragm. If it is out of line, as indi- cated by the heavy vibration against the bushing, it may be centered by removing the screws holding the speaker unit and turning the latter until the rod centers, as shown by the cessation of the vibration; the screws are then retightened. The set- screw at the front is also tightened, and the result will be a much better repro- duction. An output transformer between the set and speaker will greatly increase the handling range of the latter, as well as protect its delicate windings from the high-voltage d.c. current of the B-supply. when will prove desirable. There are times a damping effect This may be ob- tained by wrapping several layers of tape 1012 They represent not merely ideas, but in the profession on methods that will help make set more efficient in operation, more convenient to handle Popular Mechanics pract or easier to build. on the driving rod. An easier me is to tape a small weight on the of the driving rod, at the point of speaker.—Peter Gioga, engineer, St KSMR, Santa Maria, Calif. Forms for Low-Loss Coils When winding coils on bakelite tu vreater efficiency can be obtained by ting slots in the tubes. These slot 5 in. wide and may be cut with a knife, scrollsaw. razor blade or a — binder 1 = ae BAKELITE SPT TT TUBING necessary the edge the slots | the vwrire pos i L 1 0 1 Space thes! about ! 4 OF in. apart make then long as tl if two coils are to | wound on the same tube, two sets of s| are cut.—Herman R. Wallin, commer radio operator, Brooklyn, N. Y. coil to be wound:

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POPULAR MECHANICS Spreaders for Cage Aerials _ \ite often the radio listener is tempted b | ike a cage aerial but does not know rings to use. I have discovered that m-tractor transmission oil rings ve used for this purpose, and they are ible even in the smallest towns. The number is S-345. They are thin steel 5 in. in diameter, easily drilled and light in weight. If the aerial is to be long, the rings ma, be doubled at greatest strain will he rings are spaced 10 ft. apart, and ring is drilled for the number of decided on by the builder. If a wire cage is desired, space the holes 1. apart around the circumference | e rings; for a six-wire cage, the holes paced 2% in. apart.—E. Dale Trout, ‘tor, Station WLBQ, Atwood, II. 1 ends, where the Increasing Sensitivity in Tuned R. F. Sets ar of the tuned r.f. receivers now in ( hands of radio fans are extremely sen- sitive at the Ja I-N a end - = FN the wave- end MIDGET JN length scale CONDENSER, f 4 ; 1 Ter CAPACITY = om and o ’ -00005 43 . squeal so hard that it is nec- essary to turn f the sensitivity \ control far down. These sets, above 350 or 4) meters, are apt to lose Sa sensitivity so souuter thine that they are most useless. This latter condition may e corrected by connecting a small varia- e condenser with a maximum capacity 40 or 50 mmf. from the grid to the ' ite of the second r.f. tube. This will use the receiver to oscillate more easily, nd, therefore, can be used only as a re- eneration control at long wavelengths.— bert E. Smith, engineer, Allen D. Card- : ell Mig. Corp., Brooklyn, N. Y. @ Popular Mechanics’ radio department fters its information service free to all eaders of our magazine. 1013 a —— hel SET (ir o accom, = SWC Ae — POTENTIOMETER = ‘~..>_ PHONE TIPS OR | BINDING POSTS’ Above, Circuit Diagram; Below, Bakelite or Wood Box for Instruments with Pin Jacks for Connections Homemade Volume Control The sketch and diagram show a volume- control device that can be built by any amateur; the principle is that of a volt- age divider, and it will introduce no dis- tortion in the receiver. The tubes work at their specified voltages and are in no way disturbed by the control unit. The diagram shows the simple circuit required and the sketch below indicates the suggested method of inclosing the de- vice and providing jacks for quick con- nections to the set. abov e Che switch is of the sush-pull tvpe and is required when DX- ] I YJ | signals are desired For distant stations the switch is opened and the potenti- ometer arm is moved to the aerial side. In this position, the volume control has no effect upon the receiver. With the switch closed, the operator can control the recep- tion from a whisper to full volume by ad- justing the potentiometer arm.—E., Stuart Capron, engineer, De Luxe Radio and Equipment Co., Buffalo, N. Y. Battery Supply from Farm-Lighting Plant The practice of using a six-volt block of the farm-lighting attery A supply is not good shifted as the radio unless the cells are time. If the same the block will from time to cells are used continuously

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1014 POPULAR either be undercharged or the remainder of the battery overcharged. This system- atic shifting is a tedious procedure and is seldom attended to. The diagram shows how it is possible to provide the same dis- “A +A Pe charge rate ADDITIONAL B- nal he cellc« BATTERY tar Oy on all the cell INSERTED WERE -<.. and at the same time ob- tain approxi- mately 26 volts of B-battery supply. If five standard \%4- amp. tubes are used in the resistance should be 50 ohms, of 1.5-amp. capacity.

~~ VARIABLE RESISTANCE

on b+ 32-VOLT SUPPLY set, the variable The filament rheostat in the set is then cut out entirely and the variable resistance is used to con- trol the tube filaments. Additional B-bat- tery units may be connected, as shown in the diagram, if desired. The energy con- sumed by the use of this method is only 40 watts, and the entire light-plant bat- tery unit is discharged at the same rate.— nm. F. State Iowa City. Olson, University of Lowa, Caring for the A-Battery While the possession of a trickle charger is of advantage, it does not mean that the storage battery may be neglected. In fact, it should have more attention, as most low-rate chargers have no provision for varying the rate of charge. As a re- sult, the battery is often overcharged, or few ’ in a cases, slightly under- SINGLE CLIP ~~~-—— charged. A case where the battery was overcharged came to my atten- tion when a trickle charger was hooked up to a battery sup- plying a standard five-tube set and — FLASHLIGHT BULB BASE ) then left unattended ” in a remote corner TIP_ ~~ 2 } 4 ~ iT { of the basement. ns IP. | The battery was FLEXIBLE LEAD / . . oa wars SOLDERED TO FILAMENT continuously over- charged for weeks, and the result was

CLIPS POST CONNECTED TO TIP | Seen A Neat Tester Is Easily Made from a Flashlight Case, a Burned-Out Bulb and Some Scrap Parts MECHANICS that the battery had to be sent to the for a new set of plates. A charge at a specific gravity around 1,300 and at this point the acid becomes ve and begins to attack the plates and sep arators. For best results, the batter should be alternately charged and dis- charged; in other words, it should not re- tain the same gravity reading over a long period of time. This may be avoided hydrometer checking and charging pe so regulated that the battery is kept regular charge and discharge rate within a good operating range for the set. Dis- connect the trickle charger for a short time each day or week, increasing the time that it is left disconnected until you fi that you are occasionally bringing the bat- tery down to about 1,150, below the operation of the set will be impair¢ Attention to the storage battery will repair bills and Op and me reaches fy] i separators storage battery lengthen its life—lJo! B. Eccles, chief engineer, Station WIJR Detroit, Mich. Flashlamp Makes Pocket Tester A neat little tester for condensers and transformers can be made as shown in the illustration. All that needed is an old flashlight and a few part that can usually be picked up about the bench. Remove the lens and its ferru from the flashlight and take out the bul Break the glass from a burned-out bull accompanying and dig out the wax around the filament posts. Then find the one connected the tip in the ce ter of the tube ba and solder a flexib! lead to it. Cut disk of hard rubbe the same size as t! Drill a_ hol near the center an fasten a CLIPPED TO 4 TRANSFORMER lens. double Fahnestock clip Run the bulb-base one side. lead the hole and then reassen ble the flashlight before but with th: rubber disk in place of the lens. Lastly | 2 } tnrougn \~ HARD- RUBBER DISK

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shop ome 300). ind the POPULAR 1 single-contact Fahnestock clip to etal shell of the flashlight, ahead of itch. Fasten a spring clip to the e lead from the disk and another to nd wire attached to the double clip. ittach the phone cords to the two clips as indicated. With batteries shell, the tester is completed and for use. Simply attach the spring to the transformer or condenser put on the headset and press the lhe in the phones of the part.—L. B. Mass. absence or presence of a will indicate the con- Robbins, Har- Twin Cone-Speaker Unit e twin cone-speaker unit shown in hoto is now available for use in cone construction unit in It is sensitive and to work well un- der the heavi- est loads with- out any ad- justment or attention. The unit is easy to mount in any speaker of the large cone or balsa-wood speakers. Inc ffers from the usual speaker it employs a balanced armature. be unusually I ed similar type. * A 6-ft. cord is ided terminating in the usual cord- plugs; only two small wood screws re required to mount the unit in the ‘aker frame. This simple type of sunting provides an easy method of ad- ting the thrust pin of the unit in order obtain the best results. Simple Wire-Tinning Device It is often necessary to tin the ends of ires when building a radio set, and this rather awkward with the usual tools. ie simple device shown in the sketch ovides a quick method of doing the nd costs practically nothing. A piece of eet metal is cut as shown, then crimped nd bent to form a small cup. This cup mounted either on a block wood or short metal brackets. The wire stand 1 } job MECHANICS 1015 — ——— | BENT ON. 2! DOTTED c LINES {| / ] >| SHEET | METAL 0 ae Mag EDGES ARE CRIMPED } TO FORM CUP oe SOLDERING-IRON _7 || RACK * YoY | ZA Y (SCREWED TO BASE 4 Left, Completed Device; Right, Details of Cup and of Soldering-Iron Holder for holding the soldering iron is made of No. 12 gauge and screwed to the wooden base. supporting the iron so that the tip rests in the cup, the bracket being pinched at the bend so that it is a snap fit for the iron. solder are dropped in the cup and melted by the iron, and the wire ends to be tinned are then sparingly coated with paste and dipped in the hot solder—Robert J. Wil- Chicago, Ill. wire metal wire Pieces of liams, Dry Rectifier Replacement Units Dry rectifiers for replacing bulbs and electrolytic units and the simple method of using them is lustrated in the photos. At the right, unit is shown clamped to a charger of the tungar available, 7 are now the tungar type, the bulb being removed and the plug screwed into the socket instead The unit at the left is designed to replace electrolytic-rectifier jars and takes up no more room than the latter. The unit is made of a number of disks and requires little or no attention after installation. Left, Dry Unit for Replacing Electrolytic Cells; Right, for Use on Tungar Charger

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1016 POPULAR MECHANICS control by means of which the plate volt- age of the r.f. tubes may be regulated to REC. SET. operate the tubes at their maximum eff a ciency. Increase the plate voltage on these i \ tubes from 90 to 135 volts and insert the - Qt variable resistance, shunted by a .5-mfd ; condenser, in the 135-volt B-positive lead In Fig. 3 we have a simple volume-contro] SENSITIVITY CONTROL TONE CONTROL resistance, shunted across the secon¢ of the first a.f. transformer, which serve to iron out resonance peaks or cause distortion in the usual transformer. ky generation control is possible with a able resistance shunted across the tic] 7 MF.~ or feedback coil of a three-circuit tuner OSCILLATION +5 as in Fig. 4, and Fig. 5 indicates a met! + ~ ° ° ° 6 © ) 7 “Oo “a or 7 Oo cr ) 1e & PLATE VOLTAGE DETECTOR mate f tone control for bringing out th CONTROL FOR R.F. STAGE VOLTAGE CONTROL notes and removing harshness from the speaker output. In this case, the variable resistance is placed in series with a .25 mid. fixed condenser and shunted acri the loud-speaker terminals. Many of the special detector tubes now in use requit a micrometric plate-voltage control @ best results; this is obtained by the met! in Fig. 6. shown in Resistance and impe VOLUME CONTROL || RESISTANCE COUPLING dance-coupled at. amplifiers are improve by a variable grid resistance in place the usual fixed gridleak employed in suc! stages, and the position of the resistance in the circuit is given in Fig. 7. T) method is particularly good in the power REC. SET. 7 tube stage, but is useful in all resistanc: “ coupled stages. As a loud-speaker co @® 6) trol, to regulate volume, the variable-r« d sistance unit is shunted across the speake REGENERATION CONTROL | LOUD-SPEAKER CONTROL terminals, as shown in Fig. 8. This pr Simple Methods of Improving the Set by Means of cedure is not to be confused with the tor Variable-Resistance Units control method previously described. Variable Resistance Improves Set two loud speakers are used, one of hig and the other of low pitch, each may b \s a means of control, a variable resist- shunted with a volume control and t ance is an important part of any radio relative output of both controlled for t! set, but many owners do not realize that most desirable blending. they can use these in several positions - ~ for the improvement of their receivers. (he accompanying diagrams give a few suggestions in this respect. The sensi- A new super-power tube, to be known tivity control, Fig. 1, prevents excessive as the UX-250 or CX-350, has been an signal pick-up, which broadens tuning nounced. This tube is a larger and mort The Latest in Super-Power Tubes where sets are located near powerful sta- powerful amplifier than the UX-210 typ: tions. The variable resistance may be It provides a far greater loud-speaker vo! used in series with the antenna or shunted ume, without distortion, than has here across the aerial and ground binding posts tofore been possible. It may be used at a of the set. Try both methods and retain fraction of its full capacity, thus making the best. Fig. 2 shows a simple oscillation possible undistorted output at all times.

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} } ee AMATEL 2 | i; 4 Ree MECHANICS Net el ILI] a An Electric “Aladdin’s Lamp” By DICK HUTCHINSON i ( i of the most interesting novelties given in the patterns. All the pieces can hat the home craftsman can make in be cut out with a coping saw, although a leisure moments is an electric “Alad- band saw may be used if available. First s lamp.” By consulting the illustra- cut out an oval, 3 in. wide and 4'% in. long, ns and following the instructions, any- as shown in detail A. This forms the base ne can make this simple and attractive of the lamp. Round off the upper edge mp, and equip it for electricity at the with a jackknife or wood file. Glue and t of a few cents. nail the small oval B to the first piece, It is made of white pine, a number of exactly in the center. Now cut piece C eces being cut out of 7%-in. material, ac- which is also rounded on one edge, then cording to the design and dimensions’ glued and nailed to B, with the rounded edge down. The next two pieces, D and Ik, are cut out and attached in the same | way. Round the under edge of D. Both | the upper and lower edges of piece E | which forms the top, should be rounded. |} Cut out a handle as shown in detail G, round the edges. and glue and nail it in place. The piece F serves as a cover and | should be well rounded on the top edge, | while the bottom edge should be grooved | | about % in., so that it will set l iW. down slightly in the lamp body ' \ small knob is glued to the cen- on Vp, ter of the cover, more Gesso-Covered Electric ‘“Alad- din’s Lamp,” Finished in An- tique Colors and Provided with Natural-Flame Lamp, Makes an Attractive and Ornamental Piece for the Mantel 1017

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1018 POPULAR vearance than because ight socket, re wire socket. Re move the black fiber from the cap and slip it over the wires and up against the bottom of the socket, to insulate the wir- ing. Set the socket in place and run tl wires back through li cover the opening wu let the socket ind glue and tack this in place. D 1 116-11 hole up through the side of the body o the lamp and insert a fiber bushing of the kind used in fixture Che lamp is now ready for a coating of fesso Pour abou t. of liquid glue into a receptacle and into this stir enough ordinary whiting to make a thick putty Add 3 on } spoot lis Of l n eed o1] and then st n more of the \ ting to make a good workable putty. With an ordinary pocketknite, pack sufficient putty around the socket to hold it firmly in place. Then cover the entire lamp with the putty, wit a more or less rotarv movement, to pro- duce a rough etfect. When completed, let it set for a day or so to dry, then go over with ied thor oughly, paint red ground in japan Rub bronze and, after this has d: with antique high lights with a soft ha prece of cloth up the piece of cloth Then wit dipped in antique g rub over reen, ground in japan, the entire surface lightly, or just sufficiently to old bronze. Pull the through the give it the appea light ~ rance of out attach a fiber bushing and MECHANICS T Fe 4 on J yF Patterns and Dimensions of the Various Pieces of 7% Wood, Which Are Glued and Nailed Together to Mak the Body and Cover of the Lamp, the Edges Bei: Rounded and Gesso Applied over the Entire Surface connecting it to the house-lig!] ing supply at a wall socket. plug for A bulb in the semblance of an ordinat candle fl ge deer be screw ed into t in order that carried out ame socket the idea of an anciet oil lamp may be as realistica possible. Cleaning Hot-Water Reservoir of Silt and Dirt the the watet the marked degree, esp Where we live in supply west, comes from mountains and carries adobe to a during the spring of the which occurs almost every our altitude of 8,000 ft. We water, and the reservoi1 cially after a rain, afternoon at ] ] 1 use considerapie to be filled four After of dirty water that of the kitchen range has or five times a ng there day. every empty is about 2 in. has to be removed. The range is used also during the night the reservoir is always hot. Tak the dirty therefore a task, unt when the cat that was being washed, ld be useful to soak up day and sometimes o that out water ing was painful one day it occ urred to me a big sponge wot the boiling water in the dirty reservoir I got a pie tin lifter and proceeded to drop the sponge into the boiling, silty water, removed it and submerged it in a

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of cold water. Then I ueezed all the water out of the onge and repeated the opera- n a few times until the reser- ir was empty.—Winifred Mc- lillen, Ridgway, Colo. Foot Brake for the Scooter Nowadays, homemade soap-box cooters have found particular ivor among the kiddies, but their use has certain disadvantages. (hey help wear out shoe leather remarkably fast. as the feet are used both for braking and pro- unnecessary wear, the brake hown in the drawing may be

- ' mt TO FAUCET —---» pulsion. To avoid some of this WATER INLE provided. It consists of a strip 1 wood, fastened to the under- 1 ide of the scooter by means of i leather hinge. An old rubber | heel is nailed to the other end of at the brake, a section of inner tube FAN -- POPULAR MECHANICS 1019

Tm-~0

" Water-Cooled Coils and Elec- tric Fan Make Good Air-Cool- ing Device for the Kitchen

provided to keep the brake off the ground, an old valve stem is used as 1 pedal to press the brake down, and two guide nails are driven on each side of the brake to hold it in position. In use, the child presses on the pedal, which causes the brake to bear down against the side- walk. This stops the scooter in a short distance, depending on the speed and the pressure on ‘the brake—Earl E. Moffat, Los Angeles, Calif. | | i

il | ; SECTION OF ; INNER TUBE

——S

| | 1 ——__—___—_—_— Gp. LEATHER HINGE? — = ——

* HALF OF GUIDE Foun OLD SKATE > NAILS” RUBBER HEEL Pe ‘ A \ , ) “ ™ } 5 yf Ni {- » “ CE; ' / ee. % Ss A“ Vix SY ‘ atts y ”) \ Z SWAT SS, Sf Vy ae we ry iM : 4 \ ~ i t “3 ». Vi 4 ~—_ Children’s Soap-Box Scooter Can Be Improved by the Addition of a Brake

Device for Cooling Kitchen Air During summer, the kitchen is usually a warm place and, although a ventilating fan will remove hot vapors, it does not cool the air. This, however, can be ac- complished by means of a set of cooling coils placed in front of an electric fan, as shown in the drawing. The coils are made of water pipe and fittings, and the device is cut into the cold-water main so that the water flows through the coils before it gets to the faucet. This practi- cally insures a supply of fresh, cool water in the coils. The fan circulates air be- tween the coils and in the room, moderat- ing the heat considerably. It is, of course, advisable to inclose both the coils and the fan in a box with two screened sides.— Kenneth Coggeshall, Webster Groves, Mo. Improving the Bread Knife Few bread knives cut fresh bread well and with regularity. This trouble can be overcome quickly in the following man- ner: Place the knife near an open stove- burner flame, not on the fire but close to it so that the blade will get warm. Then trv it on the fresh bread.

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1020 POPULAR

‘ Dirt Chute Installed in the Kitchen Dispenses with the Usual Dustpan and Waste-Paper Basket Dirt Chute for the Kitchen Keeping th kitchen t | litated by the 1 } ! e floor clean is installation of It is clothes greatly faci dirt chute | to simile except that the aA as shown in the drawing. the common type of made in so that brushed into in use, the chute, opening is the baseboard between two studs, all the sweepings are r it. When tl opening is covered chute not ic by a portion of the baseboard, which carefully cuteout and hinged to swing upward a indicated. has. been A simil between at opening the same studs is provided in the basement, the lower ; being flush with the basement floor that a shovel can be edge of the opening SO used to scoop up the dirt when dis posing of it in the It is ad a visable to make the chute of furnace. Ss iden Bracket Attached to Front End of Auto Holds Wo sheet- Outboard

MECHANICS metal as this material will not catcl retain dirt and also asa safety measure Glenn O. Wilson, Denver, Colo Electric Heater for the Thermos Bottle To avoid the necessity lunch tle cr, a -box thermos bot ince of heating extra wat ger of breaking the giass lining +}, | h- > ><] Sa , »] Ty ae tr = “yori y 1? Cis, nave used an electric cu©riing 1 from which the hinged member was 7 | | moved so that only the rod containin element remained. By its use coffee « ‘ be made at night, the grounds strained o1 ‘a and the cle; liqu allowed TO cool OV iT night. In the morning the coffee is pour into the thermos bottle cold, the iron inserted into the bottle and the « light socket ihe cofte then be heated without bottle —Thayer Beckwith, plugged into the crackin: y i Tiffin, Ohio will Bracket Holds Outboard Motor on Auto Many campers pass up the pleasures » I an outboard motor because they have it. space to carry The drawing show convenient method of disposing of motor without sacrificing any space. A wooden bracket is attached to the fri end of the car as indicated. Al by 7 b 12-in. oak board is supported on 4% l in. iron brackets bolted to the frat of the ca Two by 1 in. bars exten from the board the front sprit bolts, to give rigi ity to the bracke Che length of the bars varies witl each particulas make OI car, but 1! ‘ the top edge of board 1s locate about 3 in. belo the top of the rad ator, the height wil usually be suitable The outboard mo tor is attached to the bracket as in dicated, and it will not obstruct the ai circulation to extent any Motor Securely ippreciable

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POPULAR MECHANICS 1021 Better Labels for Fruit Jars Labels pasted on fruit jars often come which makes it more or less difficult one to identify the contents. A better ethod is to etch or grind a frosted patch | the side of the jar. Thus you can write the rough surface with a lead pencil, nd this writing will only come off by ishing. The etching is done by form- ng a small “dam” of putty around the ortion to be frosted, and pouring a little vdrofluoric acid on the glass thus in- osed. Stir the acid with a brush, and in few minutes the glass will be found to be ufficiently etched. Pour off the acid, re- ove the putty and give the jar a thorough ashing to remove all traces of the acid nd putty. Another method is to rub the lass with a small piece of flat marble dipped in glass-cutters’ sand moistened vith water. If the sand is too coarse, use fine emery powder and water. Tape for Temporary Signs Electricians’ friction tape can be used to make temporary signs, which are often necessary dur- ing the con- struction of a building. Cut lengths of the tape to form letters, as in- dicated in the drawing, and apply them to the wall, door or window, wherever a | SELECTRICIANS’ TAPE sign is needed. The tape will adhere securely but can readily be pulled off. If some of the ad- hesive remains after this, remove it with a cloth saturated with gasoline—Frank W. Bentley, Jr., Missouri Valley, Lowa. Hat Holder for Sedan When on an auto tour and wishing to remove one’s hat, a satisfactory place to put it, out of danger of being crushed, is hard to find, especially if the sedan is crowded, or considerable luggage is car- ried along. However, a simple hat holder Wire Hat Hanger for the Sedan Is a Real Convenience on a Long Automobile Trip can be made from a wire clothes hanger. It is bent to the shape shown in the draw- ing, two eyes being formed so that it can be screwed to the side of the car near the top. It must, of course, be of such size that the crown of almost any hat can be slipped through without being pinched. Adolph Lonk, Chicago, Il. Handle on Screen-Door Hook Permits Opening from Outside It is often desired to lock or unlock a screen door from the outside and this is, of course, impossible, unless a regular latch or a specially made hook of the type shown in the drawing is used. The hook is made of No. 10 or 12-gauge , il galvanized- DOOR | HANDLE«--t-. iron wire. A FRAME Lae, hole to receive this size of ' wire is first ///y\ drrited i tap) through the door at the proper point and the wire then bent to the shape shown.—John Swayze, Newark, New Jersey

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1022 POPULAR MECHANICS the eye of the hook and wrapp: on the shank, leaving a sing

er prong or tine projecting dow: nd bearing against tl! lower part of the hook. The e1 of the tine is ground to a p ward lo bait the hook, the tine is raise and the insect is slipped on. Whe the tine is released, it resume position against the hook and pr vents the bait from coming off G. E. Hendrickson, Argyle, W Adjustable Measuring Cup Che novel cup shown in the lustration facilitates the measu

ing of fixed quantities of mater lor instance, in sow ing seed be a certain quantity of seed is usu WIRING | ally W el rhe Oo for eac be i DIAGRAM ; sn l dood tor ach b ee iy Instead of weighing the desire

oe + tl Installation of Cupboard Lamps quantity tor each bed, the se NXUIS CLOSED 7) Which Are Automatically is weighed out once, and the me a Switched On and Off ‘ . ° ? , uring cup is then adjusted to h Automatic Control for Lamps Installed just this amount. Thereafter the « Inside of Cupboard tainer is filled brimful each time. rhe « consists Of two parts, one telescoping The lower cupboards in the pantry usu- side of the other. The inner one is ally have solid doors, making them dark low, and has no handle. The outs inside so that it is difficult to find utensils. cup is slotted to permit its diameter To provide light, get an eight-lamp Christ- be made smaller by tightening a thum mas-tree cord, equipped with white lamps. screw, which is threaded through two lip Such a cord can be plugged into the 110 soldered beside the . volt house-lighting circuit To control slot as indicated. A these lamps automatically so that thev are handle is. of course. lighted when the door is opened, arrange also provided. The a spring switch, as indicated in the detail. inner cup can be A switch of this kind can be fitted to each slid up or down door.—W. Saul, Lexington, Mass when the thumbnut a is loosened, to en- Fishhook Improved to Hold Insect Bait able the user to ob

tain various meas- ures.—D. S. Olson, Missoula, Mont. Anglers who prefer to use grasshoppers and other insects as bait for trout and

similar game fish, find that it is rather difh- a cult to fasten ae A _ them to an or- Gray Finish for Polished Brass << dinary hook so that they Unlacquered brass articles can be given will appear a beautiful gray finish without the use of lifelike and paint in the following manner: Mix 1 oz

SMALL GAUGE vill . tartar emetic with iust enoue ‘iatic SPRING Wire. Will not come of tartar emetic w th just enough muriati off easily. One acid to dissolve it. Add water equal to fisherman improved his hook by adding one-third of the mixture. Apply the so a length of small-gauge spring wire to it lution to the brass and the color will soon as shown. ‘The wire is inserted through change to a pleasing gray.

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STAN 1 Ser “e CAMERA by Robert G regg

gun is set in place five feet behind the sheet, as shown in Fig. 1. With the flash, sheet, subject, and cam era all placed in their respective positions, you are all set to make the shot. Just before the exposure is made, all lights in both rooms must be extinguished and the blinds drawn, if any outside light penetrates. When the room is in total dark ness, the shutter of the camera is opened and the flashlight ignited, after which the shutter should be im mediately closed and the light in the t many amateur photographers, and turned on again. That's all there —* that includes practically everyone at

e time or other, the camera represents mere snapshot-taking device, while the ore puzzling phases of camera craft, the ck photograph and the silhouette, are Imost unknown arts. The popular im- ression that trick photography demands the skill and knowledge of the professional entirely erroneous, for excellent results can be obtained at the first trial, even with the most inexpensive camera. lake the silhouette. Here we have a two-tone product in black and white which itfords a pleasant relief from the monot- onous gray of the ordinary print. Two rooms, with an open doorway between,

are needed in making these pictures. The doorway should be entirely covered with

a white bedsheet, stretched smooth so that

no wrinkles can be seen. The person to be silhouetted takes his CAMERA SUBJECT | FLASH, pose two feet in front of the sheet, and in , CQ). : y oe : sep 2>- FD such a position that the face will be in full CP profile and not even the lashes of the eyes WHITE SHEET-~ ] can be seen when the subject is viewed ; . - . : ] wae ‘ . = Jiagram Illustrating How the Silhouette Portrait Shown irom the location of the camera. A flash Above Was Made with Simple Apparatus

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1024 POPULAR Development in the usual manner will give vou effects like those pictured herewith. Silhouettes can also be made in daylight if posed before a window which admits an abundance of clear, unobstructed light. Fig.-2 is an example. In making this pic- ture, white paper was tacked on one side of an old screen door, and this was placed outside and a few feet from the open win- MECHANICS ; Fig. 7, Posir for the Picture Above; | 8, a Regular ‘Feat,’ Easy to Do; Fig. 9, W Happened to Adonis dow, with the top ot the door leaning so that it reflected the light of the sl other light, that coming throu the window, was shut off. kodak, with the lens stopped down t ll, was used, the about 4% minute. So much for the except \ vest po exposure time beit silhouette. Anothe form of camera craft especially suited the amateur is the “cartoonette.” This a combination of a cartooned pen-and-it sketch, Fig. 3, called a “comic foreground with an actual head, the result being shown at the head of this article. Com purchased quit cheaply from any large photographic-sup ply house, foregrounds can be or you can make your own b enlarging Fig. 4 to indicated. Do cardboard, times the siz white sheet o about 18 by 30 in., making the squares on the cardboard about 2% in. o1 the side. five this on a Sketch in the figure lightly wit pencil, and then outline and black in wit! a good grade of India ink, as in Fig. 3. The manner of using the foreground 1 illustrated in Fig. 4. board containing The sheet of card held on and arranged by the photographer so that his head rests just above the neck of the cartooned body. A the cartoon is the subject’s knees,

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POPULAR MECHANICS 1025 ickground is placed behind and funny, isnt it The clever amateur ire taken photographer can produce the same luc lu evel rO I ng And Cc | crou € ects ind \ | it’s more thev re but little dinky sunfish? Yes permanent! The method is simple. You m1 can still save the day if vou have’ take a photograph of any prize beauty and along the lil old camera. Here's crease it lightly down the center. That’ of it: You simply attach the all. A snapshot of this photo, when de | “little dinky sunfish” to the end veloped, will assume the grotesque pro- hown in Fig. 9. Other effects 1; ; ] - } +; ) ur line, pose in the manner shown portion 5, and let vour brother fisherman can be produced by creasing the photo e picture. Due to the simple prin graph across or by bending it diagonally, ) of angles, the resultant picture will as shown in Figs. 10 and 11 respectively mething like the one shown in Fig. Perhaps one of the oldest of camera perfect example of fisherman’s luck! tricks is “The Man in the Bottle.” In ther wide-angle study is pictured the illustration, Fig. 13, it is “The Girl 7 and 8 Fig. 7 shows how the _ the Bottle,” but in any case the method is ood results can be obtained is arranged in relation to the identical, and g taking the picture, and Fig. 8 out of doors with any ordinary vest he finished picture turned out. No pocket camera uing—it’s some “feat”! Have the subject stand on a box whic! ember the last time you went tothe has been covered with a black cloth, and l? \nd saw your perfectly pro- take a snap of him, or her, from a med anatomy and physiognomy dis- v the convex and concave mirrors ? ~ derisH oF el | Fig. 2, Another Silhouette; Fig. 3, Sketch for Cartoonette: Figs. 4 a 5, Methods of Posing Subjects for Cartoonette and for “Fish Story

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10.26 POPULAR MECHANICS

Figs. 10 and Examples of tortion; Fig. 12, ‘*The in the Bottle,” or ‘‘¢ Peach,” If Y« Call Her Th

ome. os ; , , nce of 15 ft., resting votir camera on taking the picture ot the subje ome solid objec Then obtain a large a little experimenting you will be clear bottle and place it in such a position produce this quaint eifect as easily that the outline of the bottle will be sure ing an ordinary snapshot to extend a around the subject picture. ihe exampie snown 1n Fig. 13 Snap the bottle on the same film Make vanced double-exposure stunt but ; : ; , ; exposure a trifle longet than when this demands somewhat more

the previous tricks, the procedure Look What Came simple. The photograph of the git Out o th nk P : . , coeds <4 rw taken fit st, using a black background vanced Double-Ex picture of the man was then take: posure Trick, but 1 One That Also Is ize, on the same plate. Comparatively _— di : ‘ntesre = ia tie The 1 laking of stunt pictures | ke will add greater interest to the posse of a small camera, for sooner or later becomes tire

amateur photographer

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POPULAR MECHANICS rnal sameness of his snapshots, and ir other worlds to conquer. Stunt afford a new world of pleasure, for himself, but for his friends 4 ain Cap for the Gasoline Hose t gasoline pumps le a holder for the which keeps the of the The objection- feature of this posi- that e hose end nozzle ] heavy rains with water, he result that some mer gets a_ liberal mn in his gasoline revent this, one gas n owner made a cap for the hose to keep out the It was made of itha slight taper to match that of Iwo cranks were p zie The small end was closed by so that both hands ing on a disk of the same metal. which was found t ill chain was fastened to the open using either alone nd to the nozzle base. When the connected toa 1a removed, it hung from the nozzle ~-hain. After use the hose. the is placed over the nozzle and the hooked the rack the No water from rains has entered 4 solution | much paraffin, cut of Paraffin on hose of solution ot hose since the cap was provided Is Ings, as the gasoli1 Cork Holds Razor Blade for Ripping handy sim- old satety-razor blade is a for ripping and carries the paratin seams other cloth, after which How ever, thin blades are pa | vr | er hard to hold | ™" To suitable one end the fingers. ide a 1] 1 i@ SINK the blade into a as shown in photo. This kes it much er to manipulate blade.—F rank Bentley, Jr., souri Valley, Ia. ~" Ordinary Cork Used for Handle of Blade When Ripping Seams Safety-Razor For waterproofing parainn prepare applied to the ca 1027 Rowboat Operated by Bicycle Mechanism Finding rowing too hard, slow and gen- inconvenient, erally one rowboat owner | mean the reanimation of interest installed a bicycle mechanism to propel it. vorth-while hobby. ' { , Bicycle Mechanism Fitted to Rowboat and Driving a j a Propeller Provides More Speed and Less Hardship " le 1 of one, nd feet « ld b used, be le tiresome than | ce Sat . r ( iim arrive 15S Used for Waterproofing Canvas canvas, paint it with ind gasoline. The 1 by dissolving as to sma thin shay e sorb. When ’ 1 ~ +] cy ] 1 C = cl ) ne nto the pores of the evaporates, leay nga ediment of par iffin sj r that watery] yrooIT$s the cloth eftectiy ely. lhe solution can be ipplied by means of in old whiskbroom. If it is let stand for any length of time, more gasoline will have to be added to 1 replace that lost by evaporation,and the solution must be stirred thoroughly

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1028 POPULAR Laid over Tack to Be Pulled Provides Lever- age and Prevents Objectionable Marks Washer Easy Method of Removing Tacks tool to dig out lhe screwdriver is an ever-ready average house owner tacks. Its efhciency at this job can be improved considerably by using a small washer as shown in the illustration. The washer is put over the tack and provides a good fulcrum, holds the screwdriver in place, and makes it possible to pull out a stubborn tack without marring or nick- ing the wood. Rubber Cap on Broom Handle Protects Varnished Surfaces kind can be Rubber ends of caps of the crutches the obtained in va- used on j ii rious sizes at almost ys) anv drug store. Itisa i Z RUBBER good idea to provide zg ~~ the broom and mop === ‘| handles with these caps in order to avoid } marring papered walls and varnished wood- I work, for, when one is SF busy working, it often a. happens that the end HANDLE OF of the handle hits a BROOM OR MOP : : furniture or the broom is inadvertently placed against the wall—W. W. Snvypp, Lakewood, Ohio. piece of MECHANICS Oiling the Doormat After some u e, coco and othe doormats collect dust, which tracked into the house. Chis can be entire ly voided \ p! mat with cedar oil, using a fine fly-poison sprayer. Apply just ¢ oil to barely cover the surface of th« If this is done properly, you nee fear of the oil being tracked house. By gi and shake, all dirt dust can be rei and it will alwavs be clean.—L. B bins, Harwich, Mass Collapsible Tent Pole In order to economize Ot! pace touring. a collapsible tent pole ot shown in the drawing will be fou considerable utility. If the pole is 6 ft., only one joint is length of hardwood, 1 in. square satisfactory. pieces which are hinged together b of ordinary flat 1 ole this purpose as indicated. Four angles are required. They are securely by means of ‘aie, ' wood screws so that the ends project and 1 are in alinement. A int | + HI machine screw can then be inserted to serve asa pivot. A short chain and a cot- ter pin are attached by means of a staple or screweye, the pin be- ing used to hold hinges together when the the pole is set up at full length.—Claude P. COTTER PIN Fordyce, Falls City, Nebraska. Method of Preserving Paint and Ename! Everyone who has used paint and amel knows that, if the can is not empt but the rest for the future, paint in time becomes hard put away and usele A good method of preventing this troul is to melt some paraffin and pour it o the paint as soon as one has finished us it. This hardens over the surface of

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POPULAR MECHANICS 1029 : but provides an effective seal against ir, thus keeping the paint in good tion indefinitely—Charles Latour, lattsburg, N. Y. How to Make an Ornamental Box with Button Design 4 useful box ornamented with pearl ns can be made from a wooden cigar a mint container of the 1-lb. size or itfee tin. Cover the outside surface a sizing coat of glue, and after this Irv, apply gesso or Egyptian clay to top and sides to a thickness of about While the clay is still soft press of flat pearl buttons of uniform into it around the edge of the lid. lesired, you may make a simple design huttons, such as a four-leaf clover, in center of the lid. With a stiff brush yple or swirl the clay in the spaces be- ‘en the trimming, both on top and on sides. After the clay has set, apply bronze to the stippled spaces with | paint and give the button border and tral figure any colors desired with int. Green or red buttons make a very ‘ly trimming against the gold-bronze kground. Also paint the inside of the with gold-bronze paint.—Hilda Elly- Allen, Onawa, Iowa. i Camper’s Cot Made Comfortable with Rubber Bands iwo long rubber bands, about 2 in. wide, ut from an old inner tube and stretched igonally underneath the canvas of a ling cot, as indicated in the illustra on, will add eatly to its com- rt. Smaller bands, out 34 in. wide, un crosswise under e cot and over the lding at the an- es and the waist, ill prevent an un- sy sleeper from hrowing off his ivering. When the / ~ / 7 ». : Ce HANDLE —\\ _--NUT ga Detachable Handles for the Outboard Motor Are Con venient for Carrying It Detachable Handles for Outboard Motor An outboard motor is an unusually bulky article and difficult to carry, be- cause there is almost no way of getting a firm hold of it. One cannot grasp the steering handle, timer lever or other pro- jecting parts, for fear of damaging them Hence, specially made handles, fitting the spark-plug holes of the cylinders, will be found convenient. Each handle is made of cold-rolled steel rod, bent to the shape most suitable for the purpose, and the end is fastened to the body of an old spark plug, by threading the handle end and using nuts to hold the parts together or by welding. Such very RUBBER BAND 2” —a > a pair of handles Se ee occupy little space in the tool box. When the mo tor has to be lifted and carried or han ’ = dled in any other 3 ———— | way, all that is nec : ) essary is to remove the spark plugs and it is folded, these inds can be used 'o hold the cot ina pact bundle. Rubber Bands Cut from fort of a Camp Cot and screw in the han RUBBER BANDS ae : ammeter. eae Panes ta dies in the spark INNER TUBE plug holes.—John Edwin Hoag, Los Inner Tubes Increase Com- Angeles, Calif Hold the Bedding in Place

Page 156

Page 157

Build this Model O Ia RINKC, SLYUYY, By James Tate re item, small but essential, shaping the insides of the chocks to fit | be added to the model to make _ hull, allow about Me in. on each side for the ‘te: the guvs for the main-brace thickness of the thin-felt lit Stain the From a point %& wood light-brown mahogan the end of the bump- or light walnut and finish wit] ide, fit a short everal coat of " rubb , 22-link chain, run- ya hard, dull po n to the center of the not essent that the Iding. Fit a similar vattern given for the stand be om the end of the followed exactly, but it is ad on the after side, to \ ed that the nes ot the stand in. straight aft on be kept mple An ove elabo . Paint black. These rate stand, highly varnished o1 Ip the bumpkins take polishes merely calls undu on the main braces ttention to itself and detract e stand for the model 1 fanv oO walnut. the —— del ier tl ade i hi , ? attHEnD ry . 1 . og 1 in. thick. 16 in. "ae t¢ AY The simpler the stand is. the 634 in. wide. Cut the

Page 158

RO ee eae a= a Ani, 7 imgityeg atk baat tf | SCOR SSM ARAVANL YH |

Page 159

ye 1U6 POPULAR MECHANICS 1033 Whether or not a case should be built or the model is largely a matter of taste. (here is no doubt that, in the home, an open” model is decidedly more attractive than one inclosed in a ‘lass case, but, on the 1030, the camera was pointing at the star- board bow, and the light was coming over the starboard quarter. The black back- ground shows up the running rigging, and Fa CHOCK,CUT FROM BODY MOLD NO.15 CHOCK CUT FROM MOLD NO.75 ther hand, ship models | m7 ire marvelous dust catch- 3" 5" ers and hard to clean, and 2 4 - there is always therisk of ¢€ a = ee the enthusiastic maid or © 7 —J housewife doing a lot of F ‘ 16" xa] damage when dusting SIDE VIEW around a valuable model. If a case is made, the same advice applies as for -— THIN FELT the stand; make it simple and avoid heavy, over- elaborate moldings. The two full-page END VIEW photos accompanying this article illustrate how the photos for the contest should be taken. llere, again, it is not essential that con- testants’ photos be exactly like these, but the two views show best the points on which models will be judged, and thus are hest from the point of view of the con- testant, as well as of the judges. One hint in connection with the taking of these photos will be useful. Use a black background, and illuminate the model from the same side as that on which the camera is placed. In the photo on page Cooking on a “Tin Heater” Here is a method Manitoba cordwood cutters use for cooking on a light sheet- Container Installed in Heating Stove Permits Cooking without Smoke and Soot metal stove, called a “tin heater.” A heavy tin or sheet-metal container, such as an THIN FELT 4 DETAIL OF FASTENING the reflected light on the standing rigging makes the black cords stand out also. The pictures lose somewhat in printing, but, on the original photographs taken by this method, every line was as sharp and distinct as though etched on the plate. According to the rules, the contest closes two months after the date upon which the final article appears in the mag- azine. Consequently the deadline is Aug. 1, 1928, and all photos and negatives must be in our hands on or betore that date. ice-cream can, is hung in the stove through a hole in the top, as shown, the upper edge of the can being cut in sections, which are bent over at right angles to form a shoulder. A sheet-metal disk is cut to fit on the container, four small brackets be ing provided to hold it in place. If a ready-made container is not available for this purpose, one can be made from a piece of sheet metal of suitable size. It is bent to a cylindrical form, the edges being over- lapped about 1 in. and fastened with cop per rivets. The bottom is a disk held in place by right-angle brackets fastened to it and to the side of the container. A hole should be made in the cover to facilitate its removal. Baking can be done in the container, frying and cooking on top. There will be no trouble from smoke or soot.—H.: Webster, Winnipeg, Can.

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How to Fold a Tent Single-Handed By R. R. CARRYL WHEN out camping, there is usual h; more than one person to help breaking camp, taking down the tent ar i packing up the provisions and accessorie Sometimes, however, it is necessary to fol the tent single-handed: this is often con sidered quite a difficult job, but anyor can do it without trouble by carefully fol lowing the instructions contained in th article and proceeding along the lines i: dicated in the accompanying photograp! Although this method may require a litt! longer time to do the work than it would with the help of an assistant, the job « nevertheless be done just as well. rhe first step in taking the tent down to loosen all the guy ropes except th: 1 corner ones, Fig. 1. The butts of all t] ra | ' ] ar 1 ) 1 ] - ¢ riagepoies are then moved overt Ow one side, for instance, the right side as y are facing the opening of the tent, an the two corner ropes on the left side a: then loosened. As the poles are set at angle their weight will prevent the tent } from falling over until the corner rop: on the right side are loosened, and t] heii ate Raat ee ey « O Mmm ee ee = - wr. ae oenceemnees Striking Camp and Folding and Packing the Tent Are Usually Formidable Jobs for One Man, but by Using the Method Shown in the Above “Movie,” the Task Is Made Comparatively Simpie; the Photos Show All the Steps in Taking Down and Folding the Tent, in Proper Sequence 1034

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nt >. ee POPULAR MECHANICS 1035 nt allowed to tip and fall over to the it. One side of the tent is then carried er so that the inner side of the tent is tirely exposed and the outside and all e guy ropes underneath. The poles are emoved and packed separately. The tent des, which include all the material up to he edge of the roof where the guy ropes re attached, are folded over toward the nside, care being taken to straighten out he ends and the flaps of the opening, Figs. 2and 3. Keep all the guy ropes out- ide. Fold the tent over again, as shown n Fig. 4, so that the width is a little ess than the length of the carrying bag. lf you have no carrying bag, the width hould correspond to the space allowed for toring the tent. All the ropes now pro- iect from one side. Bring both ends over toward the center, as shown in Fig. 5, and after folding all the ropes in, start rolling the tent to form a tight bundle, Fig. 6. Stop just as the roll is finished so that its own weight will hold it in place while you vet the carrying bag. Then, holding the rolled tent under one arm, proceed to slip on the cover, as shown in Fig. 7. After this is done, draw a rope through the brass eves to close the bag tightly. If the bag is placed where rain can get at it, be sure to set it in such a position that the open- ing is underneath, in order to prevent the rain from penetrating to the inside. To waterproof the bag or the tent, dis- solve paraffin in gasoline and apply to the canvas. The paraffin fills the pores and effectively waterproofs the fabric. Fastening Screen-Door Hook Securely Most screen-door hooks can readily be opened by merely striking the door, the jar causing the hook to jump up out of the screweye. To prevent this from occurring, as is often desired, espe- cially when the doors are left open all night during the summer months, it is only nec- essary to turn the screweye over a little, forcing it over the end of the hook. When this has been done, the hook cannot be opened until the screweye is turned back to its original position. Rake Made from Discarded Magnets Is Useful for Picking Up Nails and Tacks Magnetic Rake Picks Up Nails I had numerous tire punctures caused by nails picked up in the alley, outside my garage, and decided to eliminate this trou- ble by the use of a magnetic rake. This was made from discarded Ford magneto magnets, which anyone can obtain from a junk yard for a few cents, and the photo clearly shows its construction. In a few minutes, I picked up over two quarts of spikes, nails and tacks from a small space. —C, H, Rise, Rapid City, S, Dak, Aluminum Paint for Auto Rims Auto rims become rusty after having been in use for some time. Graphite paint is often applied to the rim to prevent the accumulation of rust, but this does not always prove effective. It is better to scrape as much of the rust off as possible, clean the rim thoroughly and then apply a coating of aluminum paint. This covers well and adheres to the metal for a con- siderable length of time. Evanston, III. Thomas Blaine,

Page 162

1036 POPULAR MECHANICS Beaded Hook Attracts Fish Chere are innumerable kinds of t: ¥ hooks, spoons and spinners on the mat > [+t but one that should prone just as g j \ Sh | F as any of these 1 be made in a few 1 A [ \ h — ments from an ordinary hook. Heat 1 . eye of the hook and open it up. Str is many glass beads, of various colo possible on the shank. Use a bead a small hole for the first one so that will bind at the sharp bend of the ho and not go to the barb. Heat the e again and bend it back s former It can be | hardened by plungi T ] ittractive lure for bass, and other fish. Increasing the Voltage of Run-Down Dry Cells When three or four dry cells, hool

Two Hooks Attached | eee ee to a Stove Provide a * OMLOINeG Handy Place for the their power can be increased tempor Teakettle a | by reversing the connections of one « 1] ] lets ce F ho in ) cle lo Hanger on Stove Keeps Teakettle , ; . - © tow 3 liustratior S s; done ) ( mnect Out of the Wa y the cen po t o1 po t e te nal o On a small gas range it often happen end cell to the side or negative term that the teakettle is in the way when « ook of the next cell, which is connected in pa ing, and it is rather difficult to find an allel with the rest of the cells. Then other place to put it. Two hooks, made negative terminal of the end cell is ¢ of heavy galvanized-iron wire and bent a nected to the positive terminal of the ne show are attached to the side of the ell. This arranzement adds to the vi nown, are attache tO the side oO Une cell. lis arrangement adds to the \y ] ‘i. tastes * ; ee ee eee | ee o? tmeee ] ve, Hung on these, the kKettie 1s out age Of ali the celis wi out increasing the : 1 ie i " 1:7 ie aati *4..4 ¢ _ - . srmittin ther + } 1 ] ot the way entireiv, yet readiiv accessibie. amperage, permitting them to be user } ge, | S C, D. Paterson, Worcester, Mass i longer period of time. USUAL PARALLEL HOOKUP Effective Ant Exterminator The best ant exterminator I have eve used consists of the following ingredient arsenate of soda, 1 Oz.; white sugar, | cuptful cream oO irtal ; tea poo! 1] ‘ ‘ hot water, 1 pt. Mix and stir these in- gredients until the sugar and soda are completely dissolved. Then take three baking-powder cans. with tight-fitting lids, and punch several small holes below th covers so that the ants can get in. Put e some of the poison in each can and mark the cans conspicuously to indicate that they. contain poison. Set the cans near if the ants, and in three day 3 ==

have disappeared.—William B | » Calit Reversing Connections on End Cell Increases the V Jose, LIE, age of Entire Bank

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POPULAR Hints for the Painter When using white or red lead, or any % aint in paste form, the worker often has xo rouble in keeping the contents moist, as oa ie lids on such cans are not generally s ir-tight. A satisfactory method of keep- , ng the material from hardening is to 7 pread a piece of ordinary wax paper over 4 t, pressing it down smoothly over the entire exposed surface. I have found bl that a wire strainer of the kind used in the “) kitchen is useful for straining paint. It P ill hook across the top of almost any : in, leaving the worker’s hands free to at- ; tend to the pouring.—Eric B. Roberts, Re- ina, Sask., Can. Protecting Lawns -e(] Ordinarily the public is kept from walk- ate ing on a lawn or freshly seeded places by T the simple method of driving a few stakes around the space and running wires be- tween them. Such barriers, although ef- he fective, soon lose their rigidity and then whe detract from the neat appearance. This he is because there is no “give” to the wires al and at the first contact the stakes are ir- *r ; pulled loose ® d and the wires t BI i | sag. speedily - “Trt 5 wii lh rendering the r barrier inet- fective and | more or less | dangerous. A noticeable de- parture from the conven- tional method COIL SPRINGS is shown in ————_—_—————_—_———$_ the illustra- tion, coil springs being arranged at each : corner post. The springs keep the wire stretched taut and there is sufficient give to prevent the wire from pulling the posts loose under ordinary conditions. Cheap Balcony a Substitute for Porch When building a small home, where the appropriation does not allow for an up- stairs porch, an airing balcony of the kind shown in the drawing will be found an ideal substitute. It is narrow and can be MECHANICS 1037 This Airing Balcony Is a Good Substitute for a Porch and Costs Much Less to Build built after the house is completed, if de- sired. A railing of some kind should, of For the shaking clothes, such a_ bal- cony W ill be of considerable utility. Poles. held by suitable wooden brackets, fastened to the side of the house, may be provided for hanging rugs. course, be provided for safety. airing of bedding and mattresses, rugs and brushing Photo Holder on Manuscript 1 have found it very handy, when mail- ing a photo with a short manuscript or letter, to attach an envy elope to the man- uscript.as the accompanying illustration. Simply apply a shown in little glue or li- brary the ners on the face of the envelope and attach it to Phis con- paste to four cor the sheet. forms a venient pocket for the photo, preventing it lost and protecting it from damage while en route-—Thomas Blaine, Evanston, Il. from being

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POPULAR Improving Camper’s Bed per’s stretcher bed is usually made of a piece of canvas with a hem in

Camper’s Bed Consisting of a Doubled Length of Canvas, Which P: 5 vides Dead-Air Space each side to fit the supporting pole \ } . e rood bed or this tvpe consists ota piece Of canvas about Z ft doubled ! long. This en- ables the user to insert the poles without any trouble and permits the use of poles that hz rough to be inset would perhaps be too large or too When t set up, the top and bottom surfaces of the ed in the hem. canvas inclose a layer of air, which acts as insulation to keep the sleeper’ back warm. Leaves, grass or extra clothing may be inserted in the open ends of the - — : Stan ; , ; canvas to make a dead air space | F, Chicago, Ill Remedy for Squeaky Auto Brakes Auto brake linings often become glazed, which causes them to squeak and operate unsatisfactorily. This overcome by fault can be ea Wy in the Apply kerosene to the After fill the can with neat’s-foot oil, and Such attention ill keep the brakes in a condition silent. Of manner not be fit for use immediately afterward treating the brakes following manner: brake lining by means of an oilcan. this, P Res ‘o ¢ - og = : apply in a similar way. once a month, w 1 dependable and course, brakes treated in this will especially if the kerosene and oil have MECHANICS been ipplied quite liberally. The surt of both drum and lining are then covet with oil, reducing the friction and all ing the brake to slip. How to Waterproof Matches On camping trips I often had conside able trouble in keeping matches dry, unt I waterproofed them in the following w [ obtained kind that is larg enough to hold a laver of matches. Aft these were put in, they were covered wit a small plug-tobacco tin, tl has a wide cover and melted paraftin. Another row of matche laid more paraihn was was down in the soft paratin, at added, the ing repeated until the box was full. \ will find this method entirely satisfactor and you will have bone-dry n They can be readily removed by means a penknife or other sharp-pointed too them out carefully to breaking them.—E. J. Cutting, New York. digging preve! Marill Starting a Siphon In starting the siphoning of liquid the mouth carelessly, one may get mouthful, which is rather unpleasant not dangerous, especially in case of line or other oil. This risk can be ove come by inserting a length of glass tu The tube enable as it rises and y ing in the siphon hose. you to see the liquid can oe ete | stop < uc] GLASS “4 ing betore

reaches tl] mouth. Pincl the tube to pre vent back flow RUBBER TUBE place your finger over t] open end of the class tube t hold the vac uum, insert the free end in tl vessel that is t receive the liquid trouble and no w hat- ever will be ex- Schaphorst, Newark, perienced.—W. F. New J ersey.

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2. ee | — + ; ; ; Shop ' | A, J i _ Gy All Shop Notes published in 1927, in book form—Fifty Cents—from our Book Department Mantel Clock Made from Old Alarm By R. W. MADDEN ANY an alarm clock that has been dis- carded as worn out can readily be restored to useful life by a gasoline bath and a little oiling, and may be converted into an attractive mantel clock by making - a wooden case for it. as shown in the illus- trations The better the grade of wood ar ee - 2 >) B 7 Pad | 4 11 33 a / a * | i ye | ' ; ; : ; ] ’ i 54 i | : , ] ' 1 ! ! : i} 1% ; ile J ! : ‘ - 4 ; Those Who Like to Make Useful Things around the House Will Find Pleasure in Renewing an Old Alarm Clock and Mounting It in an Attractive Wooden Mantel Case

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1040 POPULAR used for the case, and the greater the care taken in doing the work, the better will be the finished “ 5 | appearance ot the clock. Che write | I made one Ot these clock cases of white pine and stained it with mahog any wood dye Using %-in. wood, first make a rectan- in. W ; in. deep and Ve in. high. The front and back should over] ip the sides so t! ‘ 1 ular box, 514 ide, Ny no joints will The nailed together w Carefully scribe the circles o: the front and bacl where to cut at be visible from the front be glued bra d Se edges should ith small and the clock i located, them out a coping saw. These and be with circles should be smaller than the face of the clock. they will hol it securely. The curved top

for med by steaming ] Voous ss

MECHANICS the wood, Is back side. The base, made of cut as indicated in F turn down the f; A disk of thin 1S hinged on the back of the then ( [f a lathe is available, pilasters or columns. 1 Case to ¢ the opening and a small latch « turn to hold it closed. All joints must be thoroughly be provided sandy - ’ e 1 1 o . Pd pered, as a small dent or depression \ show up distinctly after the case has ] finished, T and a filler should be used | fore stain is This is particula: necessary on et orain. Apply many coats of fil ] , as the wood w ,oruntilaw as Pe like deposit cove! the surtace. Scr fol off the surplus ar ———— tain the case ood dye. The give the case ar [ ypIcation OT } shellac After P

and 134 in. wide Boiling the wood in - ° +17 ] | water will adisoO make

it pliable, but has a tendency to cause it t » become spongy he wood can be bent around a large tin can, tying or clamping it in position until thoroughly dry. Next, cut out the ; 4 : : ection, which fits under the curved Iront top This piece should be ™% in. thick 1%6 in. wide and 6 in. long \ piece of } it wood, 1 n. ea 12 j im. | mney, 1S then laid o1 each side of the curved sec tion, flat on the top ot the case. Care should be taken to 101in all the ede. ell he top molding is now ipplied It is < in. by % in. wide. This can be either pur- chased or made In the latter case. take a piece of white pine of the required dimer sions and burn in the round or concave part with a heated rod or carve with a gouge of proper sweep. he charred sur- face is removed by rubbing with sand- paper wrapped around a rod. To bend the molding for the top curve in front, it is necessary to cut slots every 4 in. on

rubbed powdered pumice stone and water fore applying t next Use i la brush with stiff bristles for this purp dipping it first in water and then in t pumicestone. It may be necessary to provide a ne : I face for the clocl . it the old one is soiled Remove the hands and then the face which can be traced on a similar disk good manila paper. With black India inl make the numerals, using a fine lette: ing pen, such as a Gillot 303. Omi't tl small alarm dial on the face. The metho of attaching the clock in the case depend on the construction of the After fitting the works front ring around clock use the c e tace can be e1 in ise, the } th ~ | oO apply Y gilded or gold leafed. it is I necessary first to brush on a coat o japan gold size. This is allowed to set for about five minutes until it become sticky, so that you can hear a slight snap

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POPULAR MECHANICS 1041 ping sound when pulling the finger away after touching it. The leaf, which comes hacked on sheets of tissue paper, can then be put on, after cutting it into strips the most suitable size for the purpose. After the leaf, with the tissue paper still ched to the back, is applied as evenly sossible, smooth it out with a camel’s- brush, about 1 in. wide. Burnish he paper with the back of your finger nail, ind then remove the paper. If there are rough edges of leaf, press them down irefully with the brush. After the size has dried overnight, give the leaf a coat- of transparent lacquer, which will pre- tarnishing. Turntable Dispenses Poultry Netting [In a hardware store where floor space was rather limited, considerable inconven- ience was experienced in the sale of poul- try netting, as there was not enough space to lay the rolls down for measuring off to the desired length. To facilitate the work, the owner made the revolving rack shown the drawing. The base was made of ak, two pieces being used as indicated. \ hole was drilled at the point of their in- tersection to receive the stub of a buggy axle, with a small wheel mounted on it. The rack could then be revolved so that the netting could be unrolled, measured ind cut off without any trouble.—G. E. Hendrickson, Argyle, Wis. } STUB OF BUGGY AXLE ~-SMALL BUGGY WHEEL Turntable in Small Store Found Convenient for Storing and Dis- pensing Poultry Netting Device Made from Hacksaw Blades Is Useful for Strip- ping Insulation from Wire Wire Stripper Made from Hacksaw Blade Anyone doing electrical work will ap- preciate this wire stripper. It is made from two pieces of fine-toothed hacksaw blade, and will quickly remove the in- sulation from small or large-gauge wire. A blade is cut in half and a hole drilled in each at the cut. This may mean anneal- ing the steel to do the job, after which it should be rehardened. Bolt the original ends together tightly and link the other two with a small rod of steel, using machine screws and nuts. This link should sepa- rate them at about the angle shown and the points of the teeth should point toward the cross- piece. In use, the stripper is clamped in a vise and the wire then pulled through the jaws. The saw teeth will remove the in- sulation quickly and neatly. @An ordinary wooden clothes- pin will serve as insulating pliers when automobile spark plugs are tested; a detached spark-plug wire is pushed into the slot in the pin, so that its end can be held close to the spark-plug bind- ing post without danger of shock.

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1042 POPULAR Hastening Sand Sifting 5 by Means of. a Simple 7 “pe Sliding Device Sliding Scraper Improves Sand Screen Using the blade of a shovel to scrape damp sand through a sifter will soon ruin the screen. A much better method is shown in the drawing. A bar of %4-in. round steel is bent to a U-shape to fit in- side of the sifter. Both ends are threaded so that a length of flat steel, drilled to fit on them, can be held by nuts. In use, the sliding device is moved back and forth, causing the sand to pass through quickly and with less wear on the screen.—G. E. Hendrickson, Argyle, Wis. Guard for the Cellar Trapdoor During summer it is often necessary to open cellar trapdoors in order to provide proper ventilation, but this involves a cer- tain degree of ——- | X4X4 BLOCKS», danger to chil- ~ ~— / . LS —= dren. Acci- BRAceE*7 dents caused ~ ~ , by falling ey a down an un- — ’ guarded cellar can be prevented by the use of a guard rail, as shown in the drawing. It consists of two lengths of 1 by 5-in. wood, the edges of which are nailed to- gether at right angles, and two 1 by 4-in. blocks at each end, with space between way MECHANICS them to fit over the edges of the cellar doors. The way of using the rail is clearly shown.—Frank Harazim, New York City. Eyelets for Paper Fasteners Protect Paper Paper fasteners of the kind that are pushed through holes in the paper and then bent over, are rather sharp and the sheets are torn easily, especially when they are frequently handled. Paper eye- lets are obtainable to overcome this trou ble, one being placed under the head of the fastener before it is inserted, and the other slipped over the shank of the fas tener before it is spread. A good sub stitute for these eyelets, in case they « not be obtained, is those found on ship- ping tags. It is an easy matter to cut them out. Homemade Facing Tool for Bibcock Seat Small, flat composition washers used in hot-water bibcocks are very often dented by obstruc- tions catching and lodging under them as the spindle is screwed down to the seat, and this causes them toe. Teak. Trimming or facing them down witha pocketknife blade is not : satisfactory, as a perfectly smooth face cannot be obtained in this way. A simple homemade facing device is shown in the illustration. Whittle a stick down so that it can just be slipped through the scre hole of the washer. Force an old safety razor blade on the end of the stick pro jecting through the hole as indicated, a1 then turn the washer against it. T! face will be trued squarely and evenly F. W. Bentley, Jr., Missouri Valley, low @ Machinists, mechanics, airmen, and others who wear goggles, are often bot! ered by grease collecting on the lenses carbon tetrachloride removes it instantly

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cellar learly + City, Paper it are r and d the when r eve- trou- ad of d the ~ and yt | es tly By ROBuck TMHE vogue for gesso and plastic paints has brought back into popularity that ost ancient of the arts, modeling. Done in low relief, it is surprisingly easy, and ery pleasing results can be obtained with limited skill if a plastic compound is used. This material can be obtained at any art store for a small sum, or even from the 10-cent stores. Its advantage over clay is that it does not require experience in mixing to the proper consistency, nor does it dry hard, hut remains in the same condition in- definitely, and may be used over and iver again. Of surse, the model- ng compound is only a means to an end and you will want to preserve your work in a per- manent form. This can be accomplished with plaster of paris or a marblelike ce- ment used by dentists. TLL => Yirntamiow \ = For many pur- poses, such as plaques, a plaster cast Is en- tirely satisfactory and less expensive than MUA UU cement. Plaster is used in either case for making the mold. The cast may be painted or enameled to obtain very beau- tiful effects. However, for articles that require greater strength and durability, the cement is recommended. This cement, which goes under such trade names as Weinstein artificial stone, Healy stone and clover rock, may be purchased from dental- supply houses or from your local dentist It dries very hard and close-grained and looks much like marble. It is com- monly used for cast- ing so-called “mar- ble” statuary. Many beautiful articles can be made by the use of these materials at small cost of time and money. As the scope of this article is necessarily lim- ited, I am describ- ing only the model ing and casting of plaques of the type shown by the photo graphs. You need not confine yourself to these, however, for there are many other 104

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1044 things you can make, such as desk sets, book ends, trays, ® lamp bases, i . ah | ye ly ik tl \ mi i} Usa f a ah \ Nath inte i candlesticks, jars, vases and even of statuary and art pieces. The first step in the making of a plaque is the selection of a design. If you have skill with a pencil, this will not be much of a problem. Assuming that you have not, I would suggest selecting some rather con- ventionalized drawing in a magazine il- lustration or advertisement, or perhaps you will prefer to use one of the drawings shown in this article. Modeling compound has certain limitations which must be rec- ognized at the outset. Fine detail must be avoided and care must be taken that no backdraft or undercutting, which would prevent the separation of the cast and the mold, is present. Of course, if provision is made for dividing the mold into sec- tions, as is done with statuary, you need not guard against undercutting, although it is best avoided at the start. copies RWI AD Kis POPULAR MECHANICS After you have selected a design of suitable size, or enlarged one to the size required, you are ready to begin. A piece of sheet iron or somewhat large; than the size of the finished plaque used to do the modeling on, as any absorbent ma- terial, such as wood soaks up the oil from the compound. Roll the m terial out smoothly to an even thickness about 4% in. An olive bottle or glass rolling pir is convenient for this pur pose. Fig. 1 stage of the process. The next step is the cutting of the bach ground to size by the of a cardboard patter as shown in Fig. 2. ordinary vegetable kn glass, shows this is suitable for this. M: eling tools can be made from slivers @ of wood that may be cut in a variety of shapes that will suggest themselves to you. They should be sanded so that they will lea the model smooth. . The actual building up of the design largely a matter of. patience and care. T| drawing is placed on the surface of th compound and traced with a sharp pence point to make an impression on the co pound. Pieces of the material are the cut to the approximate size and shape « the raised portions of the design and put in their proper positions, and tools are used to work the material into place an to the exact size and shape desired. Parts

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POPULAR MECHANICS 1045 ire to be raised are built up to height surface of the water, as raising it out of the background. Some detail may the water produces bubbles and results Lined by cutting into the raised por- in a spongy mold. or even into the background. If The plaster should be poured into the ter contrast or an appearance of mold slowly. It is best to cover the de- ter depth is desired, a roughening of sign only % in. deep at first, then rap the background will give this effect. table sharply to break any bubbles which ed edges are formed by building on may have formed from pouring. Fill os of the compound. The finished the mold even with the top of the band lel must look as you wish the casting and allow the plaster to set. This re- e. Fig. 3 shows a model completed. Now we come to the casting of the mold plaster of paris. A band cardboard or tin, about n. high, is shaped to fit und the outside of the lel and fastened with a re or strong rubber d. (See Figs. 4 and 5.) \ dam of the compound is irced against the band on | sides to keep the plaster nfined. The latter is mixed as follows: Esti- mate the quantity of liquid laster required, and fill 1 } bowl with clean water to hat amount, Take a hand- ful of plaster and sift it into the water slowly. Keep + adding plaster while stir- _ 2, ring gently, until little de- | 'S7 2 posits or islands of plaster | x bill ippear above the surface. | A. \ This is the saturation A / point, and only a small mount of plaster should be added after that has been reached. The mixture ill then be about the con- sistency of rich cream. In =n¢ LA: P i ’ \ss \ - _ (ZZ — —_ a # = A tirring, the spoon or pad- dle must be kept below the

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1046 POPULAR quires about 15 min- utes. The dam and binding strip may then be removed, and the mold lifted from the pattern or model. It will probably be neces- sary to do a bit of trim- ming on the mold, espe- cially at the edges. Smooth all irregular places and patch with plaster any portions that are rough or did not The mold may be used for casting with plaster while still damp; in fact, bet- ter results are usually obtained this way. In order to remove the cast from the mold, it is necessary to employ some sep- arating material. A soap paste is often used for this purpose, but you will have better results with “liquid glass” and oil, sandarac varnish and oil, or collodion. All of them are satisfactory and easily ob- tained. Cover the entire surface of the mold with the separating fluid, applied with a camel’s-hair brush. After it has dried, which will be within a few minutes, a thin coating of oil is applied. Almost any kind of oil will do, but it must be a thin coating so that it does not make bub- bles or discolor the cast. cast well. A band and dam are placed around the mold just as they were around the model. MECHANICS GaN Vos may wr adel a Le The height of the bat should be such that cast will be the desired thickness. If the cast is to be of plaster, the mixing shou be done in‘the same manner as for tl mold. Care must be taken to get tl! plaster into every corner and crevice, a! to avoid forming bubbles. A small pie of wire, for a hanger, should be plac: in the plaster when it is partly set. I: case you overlook this, another method to drill small holes diagonally from the to; edge through the back, so that a light wit may be twisted in for a hanger. The cast is ready to separate from thi mold as soon as the plaster has set. You can tell when it is set by the fact that will feel quite warm to the touch, because of the chemical action that has take: place. Scrape the edges of both the mold and the cast until the separation line

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POPULAR visible all the way around. Gently insert the edge of a case-knife blade along this line to a depth of about Me in., as in Fig. 6, and all the way around again. Now, the full length of the blade in this cut, gently pry the mold from the cast. li it does not yield readily, insert the knife on the opposite side and repeat. The cast should part from the mold cleanly if you e applied the separating material over e entire surface. After the cast is sep- rated, it is ready to be smoothed and dec- orated. Do the touching up and smooth- ing while the cast is still damp, as it 1 re difficult after it is dry and hard. lf the casting is to be made with dental cement, estimate the amount you will need to fill your mold and mix the powder with vater to the consistency of thin paste. his material is less liable to form bub- does not require as care in the mixing as plaster does, but it must be mixed thoroughly. All dental plasters set slowly ; about 24 hours are usually re- quired before they set hard enough to be separated. This depends on the grade of ce- ment used, however, as it can obtained in quick-setting, medium and slow grades. A wire hanger should be inserted into the plaster when-it is only partly solidi- fied, as it is difficult to drill this mate- rial later. It may be necessary to tap the mold gently with a small wood block to start the separation. I found sandarac varnish better than the other materials for separating ce- ment. This material can be obtained at the same place you get the cement. The cement +} 1S h es, So great } pe castings are pure white and resemble mar- ble very closely, but may be ainted er enameled as desired when thor- ughly dry. ( A bit of dry color is some- times added to the dry cement, to give an MECHANICS 1047 ivory tint, which has a very pleasing effect. Various shades of bronze, such as rose, fire, green, lilac, blue silver and: old gold produce beautiful effects on plaques of either material. They may be bought in small quantities, at most paint stores, in dry form to be mixed with a bronzing liquid. It is important that the plaques or other castings to decorated be thoroughly dry before bronze paints or enamels are applied, as the slightest bit of moisture will cause the paint to flake off in spots. Brushing lacquers are also suit- able for this work and give very pleasing velvetlike results in combination with the above-mentioned bronzes. be Showcard or poster colors may be ap- plied to casts of either material while still damp, and are particularly suitable where brilliant color effects are desired. Paint- ing the entire plaque in a solid color, such as blue or red, and then high-lighting or touching up the raised portions with one of the bronzes, is one of the simplest, but not the least pleasing, treatments. Fig. 7 conventional flower plaque completed, and, though it is impossible to do justice to the with black and white, some idea of shows a coloring afl the possibilities is 2. suggested. The plaque in which the windmill is the central figure was painted in shades of blue and old gold with a border of black and stippled gold. The Venetian boatman is effective in bril orange W ith lights, d while the ship red-gol pro\ ed to be most attractive in treatment of shades sepia with the high lights The border was done in dull gold. a simp! of rubbed somewhat lighter e A mold can be used repeat edly, but it is then advisable to viling for each casting and add separating fluid also, if many are to be made. repeat the « of duplicates a coat

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1048 Wooden Guard Pre- vents Children from Climbing on Ladder Guard for Stationary Ladder Children often unthinkingly risk hurt- ing themselves by climbing ladders that. are permanently attached to tanks, barns and other buildings. To prevent this, a guard of the kind shown in the drawing may be provided. It is simply a wooden of the same width as the ladder, hinged to one side and with a hasp on the other so that it can be secured with a pad- lock. The guard should extend over three or four rungs at least, so that a boy would not be able to climb over it, even if, in spite of its presence, he should attempt to do so.—F. G. Rempe, Oakland, Calif. door Precautions to Be Taken When Soldering Gasoline Tanks Numerous serious accidents have oc- curred from attempts to stop leaks in gas- oline tanks by soldering, brazing or simi- lar processes. The use of an open-flame torch for work of this kind involves great danger, but under certain conditions even a soldering iron may cause an explosion. The danger is due to the inflammable fumes left in a tank after the gasoline has been drained out, and these fumes are POPULAR MECHANICS really more dangerous than the gasoline itself. If one is not certain that all the explosive fumes can be removed from repair job, it should not be undertaken for the loss of the job is preferable to the loss of a hand, eye, or life itself. The best method of removing the fumes is as lows: First drain all the gasoline, provid- ing a vent to allow the free entrance of air to replace the gasoline. Most tanks have a petcock or plug at the bottom, which can be opened for this purpose. After the tank has been thoroughly drained should be flushed by means of a water hose, making sure that the tank is filled with water all the time, the water entering the upper hole and escaping through the lower one. After the tank has been flushed for about 15 minutes, all the water is drained out, the inside dried by means compressed air, and the tank is then placed on a hot-water or steam radiator, or other fireless heating device. When placed on the radiator, the tank should be set so that the largest hole is at the top to per mit the free escape of fumes, and tli smaller hole at the bottom to allow the e: trance of air. These precautions may a pear to be exaggerated, but the number of accidents that arise from attempts solder gasoline tanks warrant them. Non-Slip Holder for the Oilstone When usit an oilstone, convenience often expe! enced due the lack « steady support for it. Of course, it can be held in a vis but when t! latter is in use or is net avai able, a non-sli holder will be found hand) It can be made from a piece of sheet meta cut and bent to the shape indicated. Suc a holder provides pointed feet which gry the surface of the workbench tightly whe: pressure is applied to the stone—Fred i Hake, Cincinnati, Ohio.

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‘Oline the OM a aken, O the best tol- Ovid- ot air h ive hich After dd. it Vater filled ring | the shed = 636 Is of aced ther l on rip le! POPULAR MECHANICS 1049 Sal-Ammoniac Stops Casting Leaks Small leaks or flaws in castings, that how seepage of liquid when filled, can be temporarily repaired with common sal- moniac. Dissolve % Ib. of this in warm ter and let it cool. Pour the mixture to the casting and allow it to remain indisturbed for 24 hours. If it leaks hrough too fast, place a bucket under- neath to catch it. Refill the casting when- ever necessary. The leak will gradually ecome filled with a deposit of rust and should be water-tight in 24 hours. Of ourse, this repair will stand no pressure, and a permanent one should be made as soon as possible. Vise Helps Pipe Laying Laying a long stretch of piping involves the difficulty of screwing new lengths onto those already laid. It is necessary to hold he end of the pipe that is placed with one wrench, and turn a coupling and a new length with another. The job is usu- ally done by two men, but it can be made so simple that one man can do it without heing handicapped in the least. All that s necessary is a pipe vise securely clamped to a plank, which is long enough to be laid icross the ditch as shown. The end of the piping is securely clamped in the vise, and new length can readily be screwed in. (he worker can usually do most of this by hand, grasping one end of the pipe while the other end is supported by a second plank. The tightening is, of course, done with a pipe wrench.—James H. Brundage, Katonah, N. Y. ~~. gS Pipe Vise Clamped on Plank Aids Worker to Lay Piping Single-Handed Sg * DROP,OF SOLDER — ON AXLE Simple and Easily Made Device Which Helps Amateur Stripers Do a Good Job Device for Painting Stripes Most people who paint their cars have considerable difficulty with the striping, which under ordinary conditions is an ex- pert’s job. With the aid of the simple device shown in the drawing, anyone who is careful can do the work satisfactorily. It is merely a rest for the brush and con- sists of a nail, pencil clip and two type- writer erasers of the disk type, assembled as indicated. The nail must be a sliding fit in the holes of the erasers, which are kept in place by means of a few drops of solder applied to the nail. In use, the brush is held by the pencil clip which is also soldered to the nail. It will be found, with this device, that a straight line of the same width throughout can be drawn even on curved and irregular surfaces.— S. A. Marshall, Jr., Rome, Ga. @ An easy way to clean a pipe is to hold the end of the stem against the valve of a compressed-air tube, such as is to be found in nearly every garage.

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1050 POPULAR Rope Dispenser for Hardware Store A Wisconsin hardware dealer who had been in the habit of storing his supply = ae Simple Rope pensers for Hardware Store Are Made of Pipe and Fittings Dis- of rope in the basement, where it would be out of the way, arranged to dispense it by threading the strands through holes drilled in the that any desired length might be drawn up and measured out. This, necessitated tying a knot in the end of each rope to prevent it from dropping down through the hole. The simple pipe arrangement shown in the drawing prevented this trouble. Lengths of 134-in. pipe and fittings were used as standards. They were attached to the floor over the holes and the rope was threaded through as indicated. Into the upper end of each, a short piece of l-in. pipe, equipped with a serted to drop down past the tee. floor, so however, in- the opening of is pulled out to any desired length and is prevented from dropping back into the basement by the l-in. pipe, which rests on it—G. E. Hen- drickson, Argyle, Wis. Cap, Was In use, the rope Extension Die Holder We often had some small job where an extension die holder was needed, as, for example, in the threading of auto-spring clips. To facilitate this kind of work, we improvised a holder which cost us nothing to make and saved considerable time. It consisted of an old auto-wheel tained from the junk pile. hub ob- The flange was MECHANICS cut off, and a setscrew was threaded into the side to hold the die securely in the end. A handle was, of course, also pro vided.—H. W. Swope, Danville, Pa. Calculating Number of Studs Required in a Wall Studs, ings are usually spaced 16 in. from center to center. rafters and joists in frame build To calculate exactly how many of these are required in a wall of known length, divide the total length of the w by 4, multiply by 3 and then deduct 1 For example, if the length is 20 ft., it will be found that 14 studs are required In cases one-fourth of the total distance is not even, the last space will be less than 16 in., and then you do not de duct 1. For example, if the wall is 21 ft., which gives 1534 studs, 15 studs are used. The fraction represents exactly 12 in. in this case. VW here length Where you have frac tions of an inch, forget them. With rafte you do not deduct one, as you start and finish with a rafter. The same is true of joists.—T. E. Jeffries, Charleston, W. Va Phone Directory Saves Time Busy executives who use their tele phones considerably every day, will find the phone direc tory er ee EES te ee . shown in the photo a real time saver. In one fac tory a number ot these directorie were made by photographing a typewritten orig inal and printing as many copies as were necessary Each print was glued toa piece oO} | fiber board, in which a hole was cut at one end to * fit the threaded section of the-telephone mouthpiece. This was screwed up tight to hold the card If desired, the card can be made to extend both above and below the mouthpiece so that a list of approximately 100 names will be in view.—E. H. Flaharty, Paroo, Wvo.

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into the TO- le POPULAR MECHANICS 1051 Covering Ignition Wires lligh-tension cables and other ulated wiring on automobiles may be short-circuited after they have been in use for some e, causing the current to jump through the insulation in- stead of jumping across the gaps in the spark plugs. This is very annoying, as spark plugs will rk well when they are out of the cylinders, but will not spark under compression. The trou- ble can be remedied by covering the cables with old rubber hose, hich is much cheaper than buying new cables. Reversible Box Lid A reversible box lid, which can be locked as securely as one of the hinged type, is convenient ior boxes which are used to carry material to distant points and then returned to the sender. Instead of a full hinged lid, only one board of it is hinged, as shown in the drawing. The re- maining part, which is loose, is Simple Slin Facilitates provided with extending cleats of Wheelbarrows Loaded with Brick that straddle the hinged section. A staple is, of course, driven into the edge of the lid and another on the box to per- mit locking. .When locked, the lid is se- curely fastened, side movement being pre- vented by the snug fit of the under cleats against the sides of the box. To render the use of the box simpler, the address of the receiver is painted on one side of the STAPLE----~ REVERSIBLE BOX LID JONES AND CO. MONTREAL QUEBEC oe eS — = Reversible Box Lid Bearing Addresses Facilitates Re- turn Shipments lid and that of the sender on the other.— Harry Moore, Montreal, Can. Which | oisting Hoisting Sling for Wheelbarrows During the construction of a_ brick building, the task of hoisting the bricks to the third floor was greatly facilitated by the use of the sling shown in the drawing. It is fastened to the wheelbarrow at three points, so that the load can be hoisted safely, and when the barrow reaches the upper floor it can be wheeled to the par- ticular place where the bricks are needed. The sling consists of three equal lengths of strong rope, one—for the front end of the barrow—being provided with an iron hook, while the other two are tied to iron rings, which slip over the handles of the barrow. This method has been found sat- isfactory for the average-size barrow, which will not be top-heavy in this way. —Chas. Latour, Jr., Plattsburg, N. Y. @Do not try to ream out more than Ms in. with a hand reamer.

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1052 Convenient Mask for the Bee Keeper, Made from a Hat, Screen and Cloth Face Protector for Bee Keepers mask for from an old broad-brimmed hat, a piece of fine-mesh screen, a light metal hoop and a piece of netting or cloth. The screen must be long enough to reach around the rim of the hat to which it is sewed. A simple face protector or bee keepers can be made The other edge is attached to the hoop and the overlap- ping edges of the screen are sewed to- It will be found most convenient to have the sc®teened wide. gether. section about 6 in. cloth is and the overlapping | | part The piece of netting or sewed onto the hoop edges stitched together. The cloth must be sufficiently cover the user's shoulders and chest. It extends down to the waist. If the cotton gloves should be worn, espe- large to bees are not docile, cially by persons un- familiar with bees. When handling bees one should move about slowly and quietly, and re- frain from noises POPULAR MECHANICS Finishing Wood Patterns The finish on a pattern has a distinct effect on the finish of the casting produced A rough pattern cannot leave a smooth mold in the sand. The dampness of the molding sand and the cleaning of a pat- tern by washing with water from a hose bring out all the “hair” from the surface of the wood, leaving it covered with small raised particles. Cleaning patterns by the use of water is, therefore, poor practice as is also drying them near steam pipe Places where the end wood appears on the surface of the patterns are most difficult to get smooth and keep smooth. After once smoothing the pattern, the least dampness brings out the roughness again to a greater degree than on portions wit! the grain. To prevent this, prepare sor glue water and with a brush apply tv coats to the end grain of the wood. Thi fills up the pores and effectively prevents “pulling out.” paint as usual. plied to hardwood furniture. Over this apply finishing This kink is also often ap- One Lock for Six Doors Most shops are equipped with metal clothes lockers for the convenience of employes, each of whom holds a key for his locker. One shop did not find this in- dividual-key system satisfactory, mainly because of the frequent loss of keys which gradually resulted in most of the lockers being left open. To overcome this, a mu tiple-locking system was devised whereby one lock. Hinges were attached to both ends of a wooden bar, and fastened to the first and last doors of the set of lockers y WOODEN BAR six lockers are secured with as show n in the illustration In the shop where this idea has adopted, it is the been duty of one man to lock and unlock the last door in | or sudden, jerky movements, for the bees are easily ex- cited and are then more likely to sting. —Milton A. Ayers, San Francisco, Cal. ALL LOCKERS CLOSED AND LOCKED HERE) Automatically Closing All ment Locker by Locking Only One each set at certain times. This gives satisfac tion to everyone, and it is impossible to tamper with any of the lockers dur- Doors of a Six-Compart- . . ° ing working hours.

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\VING a friction-driven drill fitted vith a sliding head, we found it advis- to guard the spindle to eliminate ver of accident to the operator. e problem involved was the design of pe of guard that would automatically and descend with the spindle. At- ing a metal shield to the sliding head he usual way was impossible in this ticular case, as it would have to pro- out too far, in order to provide suf- ent clearance for the large cone. The rd we finally devised, which proved to entirely satisfactory, is shown in the tos. It was made from an old inner e, an old clock spring and tin can. A cket, supporting a short shaft to which e clock spring was attached, was pro- ed on the frame of the drill, just in nt of the revolving cone. The inner Effective Safety Guard for a Friction Drill Press Prevents the Operator from Coming in Contact with the Re- volving Spindle; the Center Photo Shows the Danger Involved and the Side Views the Constructional Details of the Guard Safety Guard for Friction Drill By ALBERT A, BAILLEY tube was cut open to make a flat length of rubber, one end being attached to the short shaft and the other to the spindle bracket, as indicated in the side views. The inner tube is always kept under ten- sion by the clock spring, which is anchored to the inside of the tin can. The latter, which, of course, has to be covered to keep the spring safely confined, is rigidly at- tached to the bracket. With this arrange- ment, the spindle can be raised or lowered at will and the inner tube always remains taut in front of the spindle. The inner tube will effectively prevent the operator from accidentally coming in contact with the revolving spindle. This device, of course, is adaptable to many other types of drill press where the same danger exists, and is especially suited to the school shop. 1053

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1054 Bending a Strip of Thin Wood over a Polished Axle or Pipe Heated with an Alcohol Lamp Simple Way of Bending Thin Wood It is often necessary to bend a thin piece of seasoned wood to conform to some shape or pattern, as in violin making or repairing. This can be done easily in the following manner: Take a polished shaft, such as the axle of an automobile, and drill a hole in the end, about 4 in. deep, so that the wall will be about % or % in. thick. Drill a counterhole, %4 in. in diameter, through the shell, about 2 in. from the end. Clamp the shaft in a vise or fasten it se- curely to the workbench in any manner you choose, and put an alcohol lamp under the counterhole so that the flame goes inside of the hole. When the shaft is heated, dip the strip of wood in water for a moment and then slowly draw it over the polished surface of the hot shaft, as shown in the drawing, until the desired curva- ture is obtained. W-ood bent in this way will hold the curve permanently, > POPULAR MECHANICS although it can be taken out again by the same process.—Emmett Marshall, Seattle. Washington. Painting Boat Bottoms Most boats are kept in water where either weeds, barnacles or worms will at- tack the this reason paint-is used below the waterline and has the tendency to prevent destruction by either or all of these parasites. wood. For vs per CO] pet Two or three eood coats should be applied. Cop- per paint does not dry quite hard, so you need not hesitate to launch your boat even if the bottom surtace feel tacky after 24 hours Use a cheap brush in applying the paint but never use it for any other purpose. does slightly Small racing boats are often especially prepared by painting the bottoms with melted tallow of graphite and oil. This gives a slick surface which repels water and reduces or a mixture the friction, thus adding speed. Ever vaseline may be used in emergency case These lubricants are applied over the reg ularly painted bottom and _ should, course, be cleaned off after the race to prevent soiling other boats coming in con- tact with them. Self-Tightening Chain Sling It is often necessary to erect a chair block in various positions in a shop fo: temporary work. Sometimes a _ bar thrown across two beams and the block i suspended from this, or the chain is simp wrapped around one beam. In the fi: the slide out of po tion with disastrou results, and in second, the chai: may slide on a diag onal pull, unles care is taren t: wrap it well. 1] avoid both of thése hazards, a case bar may support can be made that \ tightens itself un \ der load and is con sequently rigid and safe. Use 1% by ¥% in. bar stock. Three A Chain-Sling Support Which Tightens Itself on Any Beams within Its Capacity

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’y the Pattle, vhere il] at- Opper d has n by YO or Cop- ) you even grhtly rush t for S are 4 the xture slick luc es Even ases

POPULAR MECHANICS 1055 lengths are needed, one solid piece, bent er at each end, and two pieces, half as long as the solid one. These are bent er at the outer ends only, and the inner ends are slotted and drilled for a pin, then nged to the first piece by means of a oss pin. The pull of the chain tightens - device.—Harry Moore, Hamilton, Can. Determining If Armature Shaft Is Bent The armature shaft of the Ford starting 1otor often becomes bent from a severe backfire when starting. This causes the pring or setscrew to strike inside of the Bendix cover, and the motor turns so rapidly with the Bendix removed that the eye cannot be trusted to determine vhether or not the shaft is straight. A cood method of determining this is to hold nail or a sharp-pointed punch in the center mark at the end of the armature shaft. The motor is then started and topped several times by pressing and re- leasing the switch. As the motor starts and stops, a severe vibration can be felt in the nail or punch if the armature shaft is not straight—E. T. Gunderson, Jr., Hum- boldt, Lowa. How to Nail Roofing Paper Roofing paper is usually applied as shown in the upper detail. This method is not entirely satisfactory, as the paper contracts and expands, which in course of time will pull the nails loose or enlarge the nail holes, permitting leakage. To prevent this, drive the nails in a zigzag manner, as in- dicated in the lower detail. The edge of the paper may then buckle to some extent but will not leak.

Removable Feed Box “Stationary feed boxes, generally used in horse barns, are decidedly unsanitary and cause many diseases,” says a veteran horseman. Removal of the trash from the box is not sufficient, but a thorough clean-

Removable Feed Box on Manger Facilitates Clean- SS ing and Airing ing and airing in the sunlight is essential. Accordingly, the feed boxes must be made so that they can readily be removed, yet securely held in place while in use. A good arrangement is shown in the draw- ing. In this case, two 1 by 6-in. boards, i2 in. long, were nailed to two opposite sides of the box to project underneath. Two 12-in. lengths of flat iron were bent to the shape shown and fastened to the sides of the manger, providing slots into which the extending boards on the box could be inserted. Thus the box was held securely, yet was easily removable. Safeguard for Railroad Crossings Many serious accidents have occurred to people getting their feet caught between the planking and the rail at railroad cross- ings. A method of reducing this danger is shown in the drawing. It is very sim- ply contrived, the edge of the plank ad- jacent to the rail being merely beveled. This affords plenty of clear- ance for the flanges of < the car wheels and at ° the same time makes it easy for a person to pull his foot out, in case it is accidentally caught.—F. N. Hol- lingsworth, Boston, Mass. BEVELED { ‘RAIL

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Is This Your Home? | me -——— 28-0" ». KITCHEN | Cle OxNr-0"! BED =] fac | _ROOM — Lo. ™ , eS | K t OPEN , = > PORCH LIVING ; , ROOM 13-0"x19-6" H LI (ALTERNATE i tLOCATION a }FOR OPEN —t —™~ PORCH Ps Copyright, Architects’ Small House Service Bure Plan No. 4A35 UESTIONS regarding home building addressed to this magazine will be answered by The Architects Q Small House Service Bureau of the United States, Inc., controlled by the American Institute of Archi- tects and indorsed by the United States department of commerce. Blueprints, specification forms, and ma- terial lists for the house shown here may be obtained from the Architects’ Small House Service Bureau for a small fee. If further information is desired, literature describing the plan service and publications of The Architects’ Small House Service Bureau will be sent you upon request. A booklet entitled “50 Ways to Lower Home Service Costs,” illustrated by ten Bureau homes actually lived in and showing how as much as $1,000 can be saved on a home, may be obtained for 20c. HIS is a vivid type of house, with aro- fire in the living room or in a bright cornet mantic history, and, though naturally of the kitchen. more suited to warm climates, it is found Consider the in artistic settings throughout the north th vista. When you enter is house from the end, the whole living east and northwest. The walls are a cool room lies before you. At the far end shade of stucco—white, gray or with just the fireplace, beyond it a glimpse of the a suggestion of pink. The tiles of the root sunny dining corner, and through the are variegated reds, and the iron work of door at the left you look out upon the the porch and entrance may be either open porch. There is a full basement be black or verde. neath the house. This Spanish bungalow should be of spe- ——— ting Home Builders’ Questions cial interest to younger people get started in life, or to older folks who have P Q. Can you build a fireplace in the second stor y if given up the larger house and want less there is not one below? A. Not it the tloo rs are 0 . - - 9 frame construction n all types t trame hbuiidit room. It isa home fora small family. It chimney stacks should start from the basement provides nearly every comfort and conven- Q. Is there any quick way to find out exactly how ‘ : - -* > > is no quick we ience demanded by the modern housewiie. much a hous e will cost? A. There 1 — : - : The approxima price is sometimes tound by -earnit Among its many advantages are those ot the cubic contents of the house and using this w.th the ie ft a ‘ @ ses prevailing cost per cub toot reasonable building costs and adaptability cality. For small houses thi to a narrow lot. method, though a very « f . : computed for larger buildings, At the side is an open porch of generous _ houses, etc. The i's way to . . “ ° 7 ore . tt t the s1 i st ) at ‘ dimensions, restful and inviting. Chis an estimate based ao w king drawings and spe porch isa particular advantage, for its con- = Meattons venience to the kitchen permits its use as Q. Our roof leaks. We have held out money from ke ‘ ; the contractor until he fixes it. van I force him to an outdoor dining room On cooler days, make the necessary repairs? A ir contract wi . - ‘ repair your 1 You are iuatified in holding out on the table may be set either before the open him until he does. 1056

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POPULAR MECHANICS ADVERTISING SECTION l hs te. 38 ER gs ter yh a ist - Sugersott, YANKEE The most famous and popular watch in the world! Over sixty million or in the last thirty- ve years have had de- pendable time and sturdy service from their Ingersoll Yan- kee Watches. A handful of value at a pinch of cost. Radiolite $2.25 Sugerstt TYPE-T ALARM CLOCK It’s going to be just as popular in the alarm clock field as the Yankee is in the watch world. It is priced the same and it has the Yankee qualities of re- liability and sturdiness. A half dozen good looks features such as hea rolled edge case; mat finish metal dial: antique handle. Knob alarm switch for convenience. Height 554”. Radiolite $2.25.

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POPULAR MECHANICS to ADVERTISING SECTION $244.00 PROFIT One day/ The only light in the world that throws two separate beams at one and the same time That’s what R. W. Helmer made—$244.00 Profit Day—without experience,—just showing most amazing light you ever saw—38,000 Candle Power without Glare ITS inside regular reflector—e sy Patented Device—100% more lis ht money waiting for you stounding demonstration, low cost, to install—Wonderful no glare. Pocket big whirlwind seller makes agents cleaning up. 300% Profit Big repeater, sells on sight. En- thusiastic customers multiply your sales. Over 300 sets sold in one town of 2,000 people. Prominent Users The Governor of Minnesota, the Governor of Colorado, the Mayor of Milwaukee, Chief of Police, Wichita, Kans., the General Man- ager of Milwaukee Motor Club and the Vice-President of Carolina Motor Chub are all among the prominent users of Trippe Offset Reflectors Orders Pouring In From All Over the World Our first advertising appeared in 1927 and we are already shipping TRIPPEOF FSE T REFLECTORS to England, South Africa, Australia, New Zealand, Egypt, Cuba, Mexico, now Peru and Canada. Many other foreign countries are asking for in- formation regarding this — the greatest automobile headlight all time of Salesmen Enthusiastic rank B. Finch of Kansas sold 1398 sets the last siz months pm er pe - to sell over 10,000 sets this year **Paul McLean of Providence, Rhode Island, telephones has just sold Public Service Corp. of Rhode Island 160 sets for entire fleet of cars. Rush 200 sets immediately."’ of 1927 **Have just sold Claude P. Madden 100 sets TRIPPE OFFSET REFLECTORS. Mr. Madden is the best known man in this om, having been mayor of this city two times and is a live wire.”'—C. 8S. Heim, Illinois “Cramer & Kirkwood, my local agents for this c iY, oes over my entire first shipment of 100 sets T RIPPE OFFS REFLECTORS Please rush another 100 sets Cc Bevill, pe le ‘Any man who could not sell TRIPPE OF FSET REFLECTORS, could not give food to a starving crowd.”’ J. G. Obiander “Friday night I had headlights inspected by tate Inspectors. They said it was the greatest light they had ever put on the screen.’ -A. P. Wilbur, New Yor J. E. Dudd, of Washington, wires er for 200 sets and says, ‘Here goes for big business, and I feel ‘the uw I am doing the public a favor in giving them the right kind of light.’ Write NOW—TODAY—WHILE YOU ARE THINKING OF IT. Lid M A I L N oO W (SSSeeeeeeseeeeeee. > + s AERIAL ELECTRIC CO., : & 336 W. Ohio St., C whicago. s =: Without any obligation, please send FREE SAMPLE offer § & and Trippe Offset Reflector OPPORTUNITY OFFER for . : (J Salesmen (.) Distributors : 4 . NG, «x deeb aek wana ohekstie Nels cdebeees (kaa eeee H+ s - 4 os : Address H . : H s City State : Veseececcessscesenseesesececessesssseeceessscsssescessssssssees® in One Ideal Advertising Co., of Wisconsin, write encl for 100 sets TRIPPE OFFSET RE PL EC TORS. We Putting out at least ten salesmen.’ Powell, of Canada, wires in an order for 200 sets and have set a quota of 2,000 sets during the next two months and Vi DO IT Jackson Bros. & Jones, of Cobridge, England, says { pleased to inform you that TRIPPE OFFSET REFI EC are just w hat you claim them every detail Wonderful Demonstration “I set up the demonstrat ‘ back roof tonight and the whole: borhood opened the wind wanted to know what the ! going gon I agreed with ther the light is simply terrific giare is removed when attached correct way to the cars. Lamb, Maine, 24,000,000' Prospects Want This Light Thousands killed in 1927 by lights—or glare. Country movement for long, low powerful beam that protects without blinding other f Only Trippe Offset Auto Refi do this perfectly. Trippe light roads and side ditches. No to bewilder other drivers. M spotlights unnecessary Patented United States and Foreign Countries Eliminates Glare Without Dimming or Tilting Motorists are sick and tired of clumsy headlights, dimmers, flimsy tilters and makeshift reflectors obsolete devices fail because they’re not accurately dk The Trippe Ofiset is scientifically correct—let us prov: 38,000 Candle Power Certified to in Report No. 42306 of The Electrical T: Laboratory of New York City, the official testing lab: of the Society of Automobile Engineers. The report s TRIPPE OFFSET REFLECTORS meet every requir: of the Society of Automobile Engineers. Managers Here is your opportunity to get exclusive territory and $1,000.00 and more monthly. Get crews started everywhere to agents. Clean up big this year and next. This is a r manent offer. Exclusive Territory tomorrow may be too late. It does n this remarkable device At our own risk, w 1 SAMPLE. ‘Test it in every way It does Anyone can sell Trippe Offset Reflectors and make big ! Free Sample Offer—Write Now Don't hesitate to investigate this big money-making pla mediately. Only the coupon, a postal or letter is needed. Y losing money every day you wait! At least get this propositi front of you and stuay it carefully before deciding One greatest money-making schemes ever put before specialty sak No matter what your experience in selling has been—no n what you are now selling or what you are making you cannot not to get the facts If you write NOW one cent to see send you FRE say.

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ration ple ne ow POPULAR MECHANICS ADVERTISING SECTION 5 DRAKE'S wectanicat BOOKS THEY WILL RAISE YOUR PAY— ORDER ON 5-DAY TRIAL The books listed below will perfect you in your chosen trade—pave the way to the big positions. Written in non-technical language—easy to read and understand. Every. book covers its subject completely. An entire course of instruction condensed into one volume. Your choice sent postpaid—you benefit 5 days— money refunded in full if not entirely satisfactory. Order direct from this page. ; AUTO 4~0 RADIO BATTERY CARE* REPAIR ” EE RCE ae Automobile Books Carpentry Books | Painting and Decorating ——— area ines = $3.00 Cloth Binding a ee een Dec- $5.00 £ ’ y ianty ‘ .- . = oratic a ateh id . Brookes’ Automobile Handbook 2. rhe oa ' arponsry 3 vers . $3-00 | ross Crane Book of Home Furnish- Ford Motor Car, Truck and Trac- 1¢ Steel Square, 2 vols $3.00 ing and Decoration Cloth $3.00 tor, by Manly Cloth $1.50 | Modern Estimator $1.50 | fouse Painting Methods with the Auto and Radio Battery, Care and Timber Framing $2.00 Brush and Spray Gun, by Vander- Repair, by Manly Leatherette $2.00 Rullders Architectural Drawing $2.00 walker Cloth $2.00 Motoreycle Handbook, by Manlv $1.50 Saw bit e+} Interior Wall Decoration, by Van- $4.00 : C RAlOWwS . jerwalker Leatherette $4. Roof Framing, by Van Gaasbeek $1.50 | The Mixing of Colors and Paints, by Vanderwalker Cloth $2.00 Studio Handbook—Letter and De- PRACTICA } sign $3.00 |HEATING SYSTEMS) A Show at Sho’ Cards Cloth $4.00 Sign Painting, by Atkinson. Cloth $4.00 Strong's Book of Designs, Leatherette $4.00 TROVBLE J065 LLU VENTILAT | a Modern Painters’ Cyclopedia Cloth $2.00 ) Oh | Automobile Painting Cloth $1.50 h bd) New Hardwood Finishing Cloth $1.50 Co Wood Finishing, Plain and Deco- rative Cloth $2.00 ~~ | Owen's Paint Guide Cloth $1.00 ° . Steam Engineering Swingle’s Handbook for Steam Engineers and Electricians Leatherette. $4.0 Examination Questions and An- swers for Marine and Stationary Engineers Leatherette $2.00 Steam Boilers Leatherette $2.00 Swingle’s Catechism of Steam, Gas and Electrical Engineering Leatherette $1.50 = Shop Practice Books we Practical Heating Systems, Trouble Jobs and Ventilation $4.00 ’ . ° set Metal Workers Mandal... $2:08| — Drake’s Radio Cyclopedia Modern Languages Oxy-Acetylene felding *ut- 0 i. e 0 ac ting. eer —- i Cloth $1.25 By H. P. Manly French without a Teacher Cloth $1.25 Slide Rule and Logarithmic Tables. $2.00 | 870 Pages, 985 Illustrations, 1700 Subjects, | Spanish without a Teacher Cloth $1.25 Handbook for Millwrights Cloth $2.00 | arranged alphabetically. For Service and | German without a Teacher Cloth $1.25 Machine Shop Practi Cloth $2.00 | Repair Men, Dealers, Salesmen, Experi- Everyday French $1.25 A ce Mechanical Drawing and Machine menters and Designers. Bound in Art | Everyday Spanish $1.25 Ch ° Design th $2.00 | Buckram. Price..... Seeeccecese \. -= ORDER DIRECT FROM THIS PAGE oe = — | —ON OUR MONEY-BACK PLAN = DRAKE & CO. The books listed above are only a few of the many in our % catalogue, which you will receive promptly after filling out FREDERICK . ichig2" Avenue ind mailing us the attached coupon. For quick action order R508 179 No. Mic direct from this page—cross name of each book wanted and paid your send in with price quoted. We prepay postage and send the practical xy Ss books on our money-back plan. filustrated catalogue Wi oine study FREDERICK J. DRAKE & CO. | S28Ses. | Chicago, fil. , Publishers 1 2 gapeneeee GENTLEMEN:— Pleeicn lists and R508—179 No. Michigan Ave. CHICAGO ; Drake Books Are For Sale at All Book Stores Mail Coupon For Free Catalogue Your Guide to Home Study

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e \F s . o JS SSSSSSS SS SOH SAREE RESET REESE ERERR SEES ERE SEES CSREES eee eee $6 ’M going to let you in on a little secret, Tom. It ought to be worth at least $5,000 a year to you, and I’m not goingto charge youa single penny— **‘When I was your age, I wasalways wondering why the boss never seemed to take much interest in me. Every six months or so I would hit him for a ‘raise’— and once in a great while I would get an extra $5 a week. But the big jobs—the jobs that paid real money—always went to someone else. **Then something happened that set methinking— ‘*Bob Harris, who had started at the same time I did, was promoted to the very job I had picked for myself—salary $6,500. I knew Bob didn’t have any more natural ability than I had—yet the fact remained that he got the place. AndI had to admit he was better able to swing it! **Well, I took myself aside, and for the first time in my life I looked the situation squarely in the face. That night | clipped and mailed a LaSalle coupon. How He Landed the Big Job “And now came the big surprise—for me, at least. *‘I had always looked upon home-study business training as drudgery. Inside of three weeks, how- ever, 1 actually got to “ooking forward to those different lesson assignments. ou see, instead of reading a lot of heavy, theoretical stuff, 1 took up case after case that represented ac/ual business problems. Iwas shown the principles that governed them; ¢hen I worked them out for myself. \t fas- cinated me, because I couldactually see myself grow. ‘First thing I knew, I received my first real ‘raise’ —then a better job—and a better one yet— *‘L told you I was going to let you in on a little secret. Well—the secret 1s this: Always give a little more than you’re paid for. And—so that you can be sure to give more, frst get more to give!” POPULAR MECHANICS ADVERTISING SECTION ere You Borna Money- Maker?” \ Neither was 1, but 3% [have learned the @ secret of making | money—and here it is— what you are now selling or what you are making 3 not to get the facts you cannot i

Send for These Free Books—They Tell You How You want to make more money—as soon as possible—with the least lost effort. Then there’s one thing you should do immediately—you should send to LaSalle Extension University and find out bow you can turn that secret into cash. During only six months’ time—as a direct result of putting that secret into practice—as many as 1,248 LaSalle member: reported definite salary-increases totalling $1,399,507—an av erage increase per man of 89 per cent. Find out how you can i or even exceed this record. To aid you in this purpose, LaSalle has prepared two very interesting and helpful books and will send them to you wit! out cost or obligation. One is a64-page book outlining the oppor tunities in the business field that most appeals to you—telling you exactly how you can turn them to your own advantag The other has marked the turning point for thousands. It is entitled, “Ten Years’ Promotion in One.” Face your problem—decide the field in which you want to make a big success—then fillin, clipand mail the coupon NOW, = <= Find Yourself Through LaSalle! — —— — = LaSalle Extension University The Worid’s Largest Business Training Institution Dept. 664-R Chicago I would welcome an outline of the LaSalle plan, together with a copy of “Ten Years’ Promotion in One,’’ all without obligation, O Business Management 0 Modern Salesmanship OD Higher Accountancy CO} Traffic Management D Railway Station Management D Law: Degree of LL.B. OD Commercial Law D Industrial Management D Modern Business Corre-

OD Banking and Finance © Modern Foremanship D Personnel Management O Expert Bookkeeping OD Business English

spondence D Commercial Spanish D Credit and Collection 0D Effective Speaking Correspondence 0 C. P. A. Coaching D Telegraphy D Stenotypy—Stenography Name Present Position Address

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— ese POPULAR MECHANICS ADVERTISING SECTION ULE BERS eee sewers See ; AUDELS CARPENTERS AND BUILDERS GUIDES—4 VOLS. $6 Inside Information for Carpenters, Builders, Joiners, Building Mechanics—all Wood- workers. 1600 pages; 3700 diagrams; flexible; pocket size. Short-cut instructions, new methods, ideas, solutions, plans, systems—money saving suggestions. An easy progres- sive course for the apprentice. A practical daily helper and Quick Reference for the master worker. A Helping Hand to Easier and Better Work and Better Pay. To get this aid for yourself, simply fill in and mail the FREE COUPON below. SIDE TRADE INFORMATION ON: ing strength of timbers; | to excavate; How to How to set girders and | use settings 12, 13 and eq How to use steel square; How to file and “Audels Guides worth four times ther priee— handy too as carry How te frame set saws; How to build furniture; How to use mitre box; How to use chalk line; How to use rules; How to make joints; Carpenters’ arithmetic; Mensura- tion problems; Estimat- sills; houses and roofs; How to estimate costs; How to build houses, barns, garages, bungalows, etc.; How to read and draw plans; Drawing up specifications; How 17 on the steel square; How to build hoists and scaffolds—skylights; How to build stairs; How to put on interior trim: How to hang doors; Howtolath—lay floors; How to paint. them in pock- et for refer- AUDELS PLUMBERS AND STEAMFITTERS GUIDES—4 VOLS. $6 A new set—just out! A practical, illustrated, Reference Library and Study-Course for Master Plumbers, Journeymen and Apprentice Steamfitters, Gas Fitters and Helper Sheet Metal Workers, Draughtsmen, Master Builders, engineers and all Building Trad« Students. 1670 pages; 3642 diagrams; flexible; pocket size. Guides explain all thx principles, advances and short cuts of the Plumbing and Heating trade. Contains instruc- tions on how to figure and estimate jobs. Use FREE COUPON below to examine, with out obligation, this valuable work INSIDE TRADE INFORMATION ON: tion, syphonage, tanks. | tilation, refrigeration. Drainage, sewage, puri- | Water supply, mains, ferries Pome’ Punagens «Pi aeeere Svcam Soldering, tinning. “ Audels Guides are prao- Joint wiping, bending, tical, easy to understand, beating. Pipe—iron— | fication. Fixtures— | wells, tanks. " Gas-fite | tflepls, in pian yy steel, threading. Math- | bath—kitchen Pipe | tings Underwriters. | langusce.” W.F ematics, tables, phys- | fittings, soil pipe, tools. | Sheet metal work, prob- | Arminger, Ann- ics. Materials—iron,| Laying out work. | lems, methods,Brazing, — I—you ; steel, copper, brass, | Roughing. Screwed fit- | heating, lead burning. md. id out lead, tin, antimony.| tings, flanges, joints. | Welding, various welds, 4. Sheet metal— galva-| Pipe bending, examples. | methods. Blacksmith- . nized—plate. Sanita-| Elbows. Heating, ven- | ing, forges, tools. utting mbe AUDELS MASONS AND BUILDERS GUIDES—4 VOLS. $6 in A new, complete, illustrated trade reference library, for Bricklayers, Cement Workers, mu can Plasterers, Tile Setters and Stone Masons, including a practical outline of Steel Con- struction. 1100 pages; 2067 diagrams; flexible; pocket olee. A practical! Trade Assistant _— . explaining modern methods of masonry construction. Easy to understand and apply A y Auotts reliable and authentic reference work and study-course for Master Journeyman and Young 2 wit! MASON Mechanic. Use FREE COUPON below and find out for your- qudes Masons Go are oppor self, without obligation, whether this set will benefit you. the best books on t telling INSIDE TRADE INFORMATION ON: aun chlo to jodeo.”” GA Bent > I * Bricklaying, tools, ma- | eling; How to ficure brick | Prasterera agreement; | Sortiss = S. 01S terials; Brick designs, pat- | work; Safe loads, piers, | Plastering on various sur- | Pa. 7 terns, bonds; Setting | chimneys; Boiler settings, faces:Stonem: seary:¢ ‘ut ant to frames and foundations; | anchors, fire stops; Labor | ¢° = wen “CU ting, finishing, estimating stone; Derricks, rigging; Stee construction; Fire proof; How to read blue prints Mortars, scaffolds, esti- mating; Mortarsand mor- tar mixing; Tile setting, mosaic, hollow tile; | new buildings; Plastering Straight edge test, trow-|— wood lath — metal; PRACTICAL ELECTRICITY — 1 VOL. $4 (Learn More and You Will Earn More! Audels Handy Book of Practical Electricity is a simplified Ready | githeg nce ts ota FOU lt never be without one. The ) ‘ . : skilled man is always in demand. Knowledge is power Reference and Study Course in one pocket size, leather bound vol- | Learn your trade thoroughly by easy reading. This cou ume—for Engineers, Professional Flectricians and Students. 1040 pages; | pon is your opportunity for advancement and better pay 2600 diagrams; flexible red leather bound. A reliable authority and You risk nothing in sending for Audels Guides for /fre« handy helper for every electrical worker. Contains important and valu- | ezamination. Send it NOW! I able wiring diagrams, calculations, machine eketohes, helps on maint . == os oD T HEO. AUDEL me nance and repair. Jse this FREE COUPON today and find out, with- | FREE 65 W. 23 st NEW . & SO... EXAMINATION * - out obligation, how this handy book Ple anil hor Gas Gunmenenee 1 » , ’ aily . “Ase i ne to ation will help you in your daily work | COUPON the books marked (x) below If 1 find Electro-Therapeutics, X-Rays, | ‘ ables; Concrete, forms; How te ficure concrete work; Stucco—on old and Complete in one \ handy, red leather , bound volume INSIDE TRADE INFORMATION ON: them satisfactory, I agree to mail $1 in days, on each set ordered, and to further mail $1 ’ Shocks, Welding, Brazing, Radie monthly 9n each set until I have paid the purchase price 7 Hook-ups, Motion Pictures, Tele- | a 4 CARPENTERS | 4PLUMBERS » »yhone, Telegraph, Cranes, Bells, | » eee, hen alphas Hou e, | GUIDES $6| GUIDES $6 tailways, Vehicles, Automobile Elec- : 1040 tric Systems, Ignition, Generation, 4 MASONS 1 ELECTRICIANS Lighting, Plant Management, Power GUIDES $6 HANDY BOOK $4 Plans, Armature Winding, Repairing, A. C Motors and Apparatus, D. C. Motors and Ap- paratus, Alternator Construction, Dynamos, Wir- ing Diagrams, Sign Flashers, Cable Splicing, Power Wiring, Outside Wiring, Switches, Light- oing, Rectifiers, Converters, Transformers, Fuses, Circuit Breakers, Rheostats, Electro Plating, Electro- lysis, Storage Batteries, Magnetism, Electrical En- | GOCUPATION oo. ccccccceseccccesess ergy, Conductors, Insulators, Static, Dynamic, Radio Flectricity, Applications, Ready Reference and Index Covering the entire field of Modern Electricity i i | ¥ 4 ADDRESS i i L EMPLOYED BY..... 6T30

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8 POPULAR MECHANICS ADVERTISING SECTION ALTO A YE. AR Start to Make ick “hn ~~ ace cutck = M.J. Morriston, Parkersburg, W. Va. (photo at right), never had a day's eaperience on care worth over $500 to me. I have gone into businese and I'm making over $50 a week clear, with wonderful proe- pects.” And what Mr. Mor- Friston and bundrede of others ““— have done I will help you to Fa ean aay go dol rsburg, W. Va. repai most fascinating business needs you! esting You needn't slave away at small wages another minute— Other “ aining : mail coupon and I'll tell you how I train you at home in No JOB-WAY™ Tr a OUTFITS > 3 My training includes ALL Electrical work our 6 ” time for positions paying up to $150 a week. . ~ , niimited opportunities for trained Electrical and (|) eee aries. os =m Me- INCLUDED Mechanical Auto Experts. Let me show you how my CHank , s-~1 es a _ contetng WAY” training has prepared hundreds of men a also 4 on ‘enn Gama 7 Mag- just like yourself for a quick, brilliant success in the Auto ¥ ne, also esting pair Outfits. usiness. owhere else I know of, can get you ALL this. Earn Up to $150 a Week! six sinion aonars spent ta IATION each year to repair 18 rainin Don’t sell your time for low pay! You don't need to Million Autos, ucks, gFREE when you have my “JOB-WAY” training. AS Tractors—it’s the of extra cost Directing Engineer of this Institution I know what worid’s biggest busi- Coupon brings full de- training you need to succeed, AND I GIVE YOU THAT ness. Amazing money op- tails of complete Avi- TRAINING right in your own home. MASTER every portunities everywhere for ation Training, I am branch of Auto, Truck and Tractor work. I train you ‘rained men. My Employ- offering FREE ot ex- wm 2088 Bot, books. I pring the original “JOB- ope‘ ond 1 help you to get tra charge. Send it now. " training TO YOUR HOME! : into businese for yourself. Read M Experience, Ed tion Get My Big Book Agvesmentt = Not Needed! 7 Guick! % 2. The World’s biggest, Ten agreements In my __=iI don’t care how little schooling I will send it to you big free Auto book. you have, I will train youto be- without one penny of No. 1 is “I will refund come an Auto Mechanic or re- cost. Read all the facts, every cent of your fund your money! mops and find out about the de- money if after receiv- men of all ages have become mand for trained Auto ing my training youare Garage owners and managers, Experts. Let me tell not absolutely satis- Superintendents, Foremen,Auto you how easily and fied.” This and nine Experts, BIG PAY executives, quickly you, too, may other wonderful agree- after completing Cooke “JOB- become an Auto Ex- ments make my “JOB- WAY” training, I prove to you pert. Splendid offer WAY” course the train- that I will prepare you to take right now to ambitious ing for you! Be sure to eévantage of the many wonder- men. Coupon brings get my book and read _ ful 5 of the great complete information. all ten agreements. auto business! Mail it today! Address M DIRECTING Pascunily B. W. COOKE ENGINEER CHICAGO MOTOR TRAINING CORPORATION 1916 Sunnyside Ave., Dept. 516, CHICAGO, ILL. EI ORR NES: EE MAIL THIS COUPON NOW! Free Auto Book B. W. COOKE, Directing Engineer, Chicago Motor Training Corp., Dept. 516, 1916 Sunnyside Avenue, Chicag Send me FREE your Big Auto Book A Facts” and proof that you will train me = 8} time at home Also reserve Complete Aviat Course and 4 Testing and Repair Outfits wit! obligating me, POD. 6 6 cc ctcvecseca Address ME, souks cdadckhdobansowl Stat

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PERF oe SMELLY VH7E RG = — SE ESTNE SCONE Ee OUST, 6 SEs OO ae a . Flectricity, Applications, Ready Reference and Index Covering the entire field of Modern Electricity. | i Ee 6T30 POPULAR MECHANICS ADVERTISING SECTION 9 A PAIR OF GREASY OVERALLS DOESN’T MAKE A MECHANIC Lots of fellows seem to think that all they need to do to qualify as a good mechanic is to put on a pair of greasy overalls and sort of bluff things through. Then along comes a man with real mechanical training and the first thing you know he’s the boss of the shop. Take, for instance, the career of O. C, Anderson, of Lincoln, Nebraska. He writes: “I took up a course in automobiles with the International Corre- spondence Schools, while living in a small town. When I came to Lincoln, I applied for a job at the Cushman Motor Works and showed Mr. Hildreth, the superintendent, my lesson papers. He had taken a course himself at one time, and on the strength of my course, he put me on over the heads of about 200 applicants. “After working there a short time I was put in the Testing De- partment ‘shooting trouble.’ By hard studying, in one year from the time I went there, I secured a place in a garage which I handled satisfactorily and in six weeks’ time had an increase in salary of 35 per cent. Later I became foreman in the service station of Franklin and Stutz cars, at a salary increase of 300%, “I find in hiring men that the man who will study, in place of taking in all the late shows and dances, is the man who will be on the job after the ‘get it from experience’ mechanics are out.” Mr. Anderson is just one of thousands of men who have made good as a result of I. C. S. training. Jesse G. Vincent, Vice-president of the Packard Motor Car Co., is a former I. C. S. student. So are Walter P. Chrysler, President of the Chrysler Corporation; E. V. (“Eddie”) Rickenbacker, famous Air Ace and Director of Sales for the La Salle car; and Hiram Walker, Chief Engi- neer of the Chandler Motor Car Co. The first step they took was to mark and mail an I. C. S. coupon similar to the one printed below. Make your start the same way and make it right now. We'll gladly send you complete information about the I. C. $. Automobile Courses or any other course in which you are interested. —— ————————————_—_- - — — INTERNATIONAL CORRESPONDENCE SCHOOLS, Box 5533-F, Scranton, Penna. “The Universal University’ Ww! Without cost or obligation, please send me a copy of your booklet, ‘‘Who Wins and Why,” and full particulars about een the subject before which I have marked X: ( AUTOMOBILE WORK Architect [}Chemistry [) Electric Lighting QC) Civil Engineer \rchitects’ Blueprints Pharmacy J Mechanical Engineer L) Surveying and Mapping - Contractor and Builder [ }Airplane Engines _JMechanical! Draftsman { | Metallurgy sd 1 \rchitectural Draftsman | }Agriculture and Poultry Machine Shop Practice ( } Mining | icago. Concrete Builder [ }Mathematics [ } Railroad Positions jSteam Engineering f “Au Structural Engineer [ J Electrical Engineering [}Gas Engine Operating j Radio 1 Al n spa BUSINESS TRAINING COURSES viation P)Salesmanship © Advertising [} Railway Mail Clerk s Personnel Management DZD Accountancy yithout business Correspondence [ }Common School Subjects Traffic Management (including C.P.A.) Show Card Lettering [ |} High School Subjects |} Civil Service CO) Bookkeeping Stenography and Typing J} INustrating L_) Cartooning [ } Secretarial Work English { JIndustrial Management _JCost Accounting LL} Spanish C) Freneh NOM. cimscedotorts Re Ne ee ; Street Address.............. wit | | ON a ee eS RE ee ee eee ee Oe II i ccorircsesintts nae | If you reside in Canada, send this coupon to the International Correspondence Schoole Canadian, Limited, Montreal |

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GRR. cc ccccccssccscocecocces Stat 10 POPULAR MECHANICS ADVERTISING SECTION Are You Hungry For... Adventure. | THEN CHOOSE AVIATION! RE you a red- estimated. Those who qualify quickly will fi blooded, dar- themselves on the road to undreamed of money ing he-man? — success—popularity—and prominence! Are you eager for a life of constant thrills, constant excitement and fascinating events? Do you crave Easy toGet Into Aviation by ThisHome Study Method adventure, popularity, admiration, and the applause Get into this thrilling profession at once whil: of great crowds? Then why not get _ _ field is new and uncrowded. Now into the Aviation Industry—the great- : unique new plan—you can quickly secur ° . = : of oe. ae . : ! yasic training for one of these wondert est adventure since time began—the Pick Your Job! saheiiedl job at home, is spare time. Expert greatest thrill ever offered to man? will teach you the secrets—give you all t ian yee . Flying side facts that are essential to your _ Phink what Aviation offers you. Airplane I : And, the study of Aviation is almost Thrills such as you never had before! acpiane instructor nating as the actual work itself. Every les The praise and plaudits of the multi- Airplane Engineer is chock-full of interest—and so absorbing t you poe forget you are studying. But & Airplane Repairman of all are the ultimate rewards you are fitt yourself ty gain! tude And a chance to get in on the yround floor where rewards will be un- é i ‘ted! x Airplane Assembler imited! . ° ° ° es Airplane Mechanician Send for FREE Book Aviation is growing so swiftly that Airplane Inspector Send the coupon for our new, free boo! one can hardly keep track of all the . rise out—Opportunities in the Airplane I) astonishing new developments. Air- Airplane Builder It is vitally interesting mail routes have just been extended to Airplane Salesman ele ey hie +. form a vast aerial network over the Buhibision Mansger profession you nevet entire U.S. Airlines and airplane fac- | .. ; dreamed of. We offer a | tories are springing up all over the | Airplane Contractor “egestas country. Men like Henry Ford are in | Airplane Motor a vesting ee in the a of = | Expert | nathan School of Aviation mercial Aeronautics in America! The Airplane / , So? possibilities are so tremendous that | Designer iar ie a Mints _ they stagger imagination! Diese —_ Range, Siete Everything is set for the greatest boom in his- AMERICAN § SCHOOL OF AVIATION, tory. The fortunes that came out of the automobile! sears 136- -A, 3601 Michigan Ave., Chicago, III. industry and out of motion pictures will be | Onn ithout obligation please me tag ' FREE nothing compared to the fortunes that will come =! about aca cdl tude Coures tn Penctl 1 Aviati ) out of Aviation! There is just onething holding it . E up:—tack of trained men! Even in the beginning ; wey \g thousands will be needed—and generously paid i Addr The opportunities open to them cannot be over- § Sty Stat —) ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee

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POPULAR MECHANICS ADVERTISING SECTION 11 Railroad Fare You Can Learn ALLOWED TO ALL WHO ENROLL NOW Get PRACTICAL Training in the Great Shops of E will fin money— y Method while tl Student Winding Stator Make Your Career a Happy One in the Clean, Fascinating, Profitable Field of ELECTRICITY. COYNE-Trained Men Are in Dema Here's a proposition that should arouse the enthusiasm of ev red-blooded, ambitious fellow. Why not make this your hap ert and most profitable ae Come to Chicago, the great, interesting summer resort and cfty of opportunities, I'll allow nd railroad fare here, and you can prep: ure yourself, in 12 happy weeks at COYNE ELECTRICAL SCHOOL, to join the ranks of successful Big Pay men. Why gamble on ot her lines of work when the field of Electricity offers millions of amazing opportunities? Complete Electrical Training in 12 Weeks —NOT BY CORRESPONDENCE—ALL PRACTICAL WwoRrK— Ihave etarted thousands of men, young and old, on the road to success and independence. I can do the same for you. I teach you everything i in Electricit _— -¥ A to Z, by practical instruction, Nothing that will help to make you a success is le lems on thousands of oA are’ worth Experience, Advanced electrical tas ‘in my great COYNE shops, appara’ My cneteuatere are men with years of experience Sean weeny ect oferta te Learn in Chicago, Electrical en’t bi ag ot Sronente peat copertaniiice fee E « w ng hep Waleing visit kind Telectrics! equi wer planta apd ees every o every kind of job, —~ f conditions. -_ EARN While You N? d tel advanced education or e Emo! asto CRs bh you overs Steg a sinaple. tow Center of the World | A 8 good e Hy gph Bey: ose ever PRACTICAL manner, cut prob: Chicago is the great electrical and industrial you to a good job on graduation. fet a You'll Enjoy a = unmeah in Chicago, Send Coupon NOW for My Big, . Right I akin the Wonderful Summer New FREE Book “*) 77 Joe sks Chicago, on beautiful Lake ever made by a Practical Training Institution. My offer Mich jean, » the yt riation Summer Playground. Free | Avis Bathin Beaches, Beauti- igan Ave., ful Parks, Exeursion Boats " and the great Municipal o1s Pier Zoos. Ball Parks. The daylixht saving plan makes it —— — -i ee ri, _ plenty of es: and et) ave en’ 1. Une for your Blectrkeal edu- ji _ Sean = Covne ELECTRICAL SCHOOL ae | S00 So. Paulina St., Dept. &-872 Chicago, 1. Et Dear H. C.—I sure want one of those big handsome 12x15 ifo Wieorriont books with 151 actual photographs printed in two colors. Send it quick without obligating me Also tell me about the Railroad Fare and Two Extra Courses COYNE £533: 500 South Paulina Street, CHICAGO, ILLINOIS NAME -———... -___._. —_ —_- _ _._. __..__.... __. _., ADDRESS on STATE... em

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12 POPULAR MECHANICS ADVERTISING SECTION f ¢ 4 | 7 F } 3 J J. Jones Auto Painti : ae 2 ; tyr A m < BN Te WS a Gf oa —Because here is the biggest uncrowded field in the world today. Prove it to yourself by the next You Can OwnYour 20 cars you see. Yes Sir, 17 4 ! out of 20 need painting. Own Business! will have you ready [n auto painting it’s no trick to | in afew months your own boss—own your own bus: ness and be independent! NOW—how many auto painters do you know?-. . . I thought se. Well, | You don’t have to start out with th who’s going to do the work? You biggest building on the busiest cor. are—after you get the right training . y ‘ ‘ ie and you're going to make more er. You can begin small with litt! money than you ever dreamed of! or no capital, but I don’t know of G. KING FRANKLIN $ The world is looking for trained auto another business where you cat Famous Auto painters. Cash in on this big Painting Authority G.,and! get big so fast. You Can Make from 560 to‘125 a Week | .zestmomas “Skilled Duco men a

After you get my training you can get a job anywhere. You can travel and know at your destina™ scarce We can place tion there will be a job waiting for you that pays big money. Remember—I don't forget you when many at $1.00 to $1.25 ar you complete the course. I help you get areal job. You also get a life consultation service without hour Binks, one of tl! largest auto equipment manufacturers says *‘T! 17,000,000 Cars Need Painting ae cars."" Stockton init ni extra charge Just im A There oi -w-e-n-t-y m-i-l-l-i-o-n cars in the U. S. alone—and 17 million need — _ shh here m Al priming, surfacing, painting, ducoing, varnishing, striping and the whole works—and take it from port “Belic ve oe nty ( me, I teach you the whole works so you can get in on the Big Money—or I'll refund every penny week to make paying of the small price you pay business. Nash sa} I realize that you are up against quite a problem in deciding what field to enter, but on my say-so, “This is a big field splendid opportunitic your graduates in = painting cars."" Many my advice are now making $5,000 many more like these MAIL the COUPON [imams and my guarantee to you, just come into auto painting with me and you'll be glad of it all your life fen like yourself who have taken

‘ | eee ; LEARN at HOME American Auto Painting School. ; i “mtg ot pacing + mags ya tn Ail a how | And the beauty of my proposition is that you can learn at |! Send sample shop tickets ¢ and oO ation oO 0 y spare 1e -e gs « Ac nt j# | I may a auto painting and Duco at home in spare 3 meg nace time—in the evening “t ep your pres¢ ) time 1 ar g q | A few pennies a day puts you in line for a job in this big ur . r] crowded industry. It doesn't obligate you or cost you a per Name clip the coupon : j So get this information now—while Byrd and Chamberlir — talking about flying the Atlantic, Lindbergh did it. Nuff sa i i now! : a ; G. KING FRANKLIN, Supt. . = = cot , American Auto Painting Schoo Come me ee ee §©6—dDept. 1501, 425 South Ashland Avenue, CHICAG!

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= | = ek to | ywn busi- to prove you can get eady for a well-paid ratting Job—at Home— in your spare time! with th siest cor: vith litt! know off you want a better job and you can ger pay-check and brighter r ts, ’ll show you how to get hem. It may never have occurred )you that Drafting is one of the INIALS asiest lines to get into which uco Sa*'\Mefers real opportunities and sean plac i¢ salaries. Many fellows when to $1.25 ar sytney ou mention Drafting say “Oh, I equipment ver could draw and I S says ‘'T , ll - ynufacturer aven’t any artistic tal- that their nt nt all use “ on, [Min you have any such no- phere A " ro to Free |eons mail the coupon and +3 yA ‘tireeour first 3 Drafting ake yay ing “ - 2 Nash ons. See for yourself ig field rtunitic ites in re gs Many ke these pw-easy they are to un- tandand do. See how ting the work is, ve to yourself that as good a chance ny one else to get a Drafting job. rn at } DRAFTING is Stepping- Jeet tone to BOSS-JOBS! 1 this big ur " t the Draftsman and his plans the ua per t industry would stop—all em- t and activity would cease. This ital the MACHINE AGE, and back Nutt on hinery are the Draftsmen and — Before any building, any ean be built, the Draftsman t BUILD IT ON PAPER. No vork is so INTERESTING, so iv 80 creative and original It School t out into a thousand different CHICAG) \nd by its very nature it prepares to advance, to take charge of 1 construction work % DRAFTING JOBS pay $50.00 to $120.00 a Week! Over 70,000 positions were advertised in the past year What other line offers euch opportunities—not only for jobs, but for advancement and with bigger salaries? Electrical, Auto, Manufactur- ing and Building. concerns—Railroads, Cities, Counties, States and even the U. S. Government—all need DRAFTS- MEN. In all parts of the U.S. At all year. To draw plans for roads, bridges, public works, buildings and machinery. Wonderful positions at splendid salaries in delightfully pleasant surroundings! Get in touch with me and I'll tell you how you can get one. seasons of the A wonderful bunch of HE-MEN are | Drafting informal atmosphere ; room, and thechance acquainted with | attracted to You'll enjoy the pleasant of the Drafting it gives you to get the big men of Industry No piece- work or clock-punching grind to Drafting—instead original, creative individual, thrilling work! The American School Dept. DA-74 Drexel Ave. & 58th St., Chicago TOWN wee STATE. POPULAR MECHANICS ADVERTISING SECTION 13 ctually FREE! Start with the Coupon! Send No Money! Just taking my word for the Opportunities in Drafting isn’t d enough. For decid- ing to go into Drafting or any- thing else is the most important question you'll ever be called on to answer. That’s why we’re willing to send you absolutely free—the Sret 3 lessons of our Drafting practice yurse want you to know how clear everytl as been made—how instantly vou 1 naster every step Don't say ¢ Fe "—or “I haven't education enough” or anything else Don't risk losing your biggest chance to get ahead fail the coupon and I'll show you how thousands of men JUST LIKE YOU have become Expert Draftsmen. Get my offer to prepare you for a_ well-paid Drafting positior to help you get one lollar 0.CMthn Director Extension Work without risk ol oO. ¢ Miller Director Extension Work. The American School, Dept. DA-74, Drexel Ave. & 58th St., Chicago Please nd me without cost or obliga- tion 1. The f } Drafting lesson Your offer to prepare me for, and help me get a well-paid Drafting ol Facts about the opportunities and ularie in Drafting City State

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Pr ne fe es en oe se DLL tis 14 POPULAR MECHANICS ADVERTISING SECTION Are you afraid you will be fired ? RE you sitting on the anxious bench wondering what will happen to you if business slacks up? Are you one of the many small-salaried, untrained workers who are always the first to go when employers start cutting the salary list? Why have this spectre of unemployment hanging over you all the time? Why not decide today that you are going to make yourself so valuable to your employer that he can’t get along without you? You can do it if you really want to, right at home in spare time, through the International Correspondence Schools. In just an hour a day you can get the special training that you must have if you are ever going to get —and keep—a real job at a real salary. You're ambitious, aren't you? And you want to get ahead? Then don't turn this page until you have clipped the coupon, marked the line of work you want to follow and mailed it to Scranton for full particulars. Surely it is worth at least a two-cent stamp to find out all about the I. C. S. and what it can do for you. This coupon has helped thousands of men te earn more money INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University’ Box 5534-F, Seranton, Penna. Without cost or obligation, please send me a copy of your bhook« let, “‘Who Wins and Why,’’ and full particulars about the subject before which I have marked X in the list below: BUSINESS TRAINING COURSES (Industrial Management (1) Advertising Lj V’ersonnel Management {j Business Correspondence LJ Traffic Management {} Show Card and Sign Lettering CJ Accounting and C. P. A. {]Stenography and Typing Coaching () English 0) Cost Accounting L) Civil Service {_] Bookkeeping | [] Railway Mail Clerk C) Secretarial Work CL) Common School Subjects U) Spanish (French {} High School Subjects (J Salesmanship () lilustrating C) Cartooning TECHNICAL AND INOUSTRIAL COURSES J 4 0 Electrical Engineering Architect {| Electric Lighting Architects’ Blueprints LJ Mechanical Engineer CL) Contractor and Builder J Mechanical Draftsman C) Architectural Draftsman () Machine Shop Practice () Concrete Builder L} Railroad Positions |} Structural Engineer () Gas Engine Operating () Chemistry 0) Pharmacy l } Civil Engineer (j Automebile Work L} Surveying and Mapping L) Airplane Engines J Metallurgy and Mining () Agriculture 0 Navigation J Steam Engineering Li Mathematics 0 Radio Name Street Address City ‘ State Occupation Persona_residing in Canada should send this coupon to the Interna- tional Correspondence Schools Canadian, Limited, Montreal, Canada LEARN BY DOING Every phase of all branches of ELECTRICITY taught by Actual Practice In one of America’s foren institutions for | trade training ESTABLISHED 1902 No Books Used | i] Individual Instruction Start Any Day } Write for FREE 64-pagecatlalog | THENEW YORK | 44 West 17th St, New York City i FP Se SOUS TES WUE SES CROSSES SS CSV riwwy wee eee STATEMENT OF THE OWNERSHIP, MANAGEMENT, CIRCULATION, REQUIRED BY THE ACT OF CONGRESS OF AUGUST 24, 1912. of Po Mechanics Magazine, published monthly at Chicago, Lll., for April, 192% State of Illinois, County of Cook, as. Before me, a netary public in and for the state and county aforesaid, personal peared H. H. Windsor, Jr., who, having been duly sworn according to law, depowes says that he is the editor and business man the Popular Mechanics Magazi that the follow to the best of his knowleage and belief, a true etater t of ownership, ement, et iblication for the dat above red by the Act of August 24, 1012, embodied in sex printed on the reverse of this form, to wit s of the publis editor, managing editor, and b are: Publisher, Popular Mechanics Co., 200 East Ontario St., Chicago, Il dy H. H. Windsor, Jr., 200 East Ontario St., Chicago, Ill. Managing Editor, L. K. W 200 East Ontario St., Cricago, Il. Business Manager, I Ontario St., Chicago, I. Second That the owncr is (If owned by a cory name and address must be stated and also unmediately thereunder the sddresses of stockholders owning or holding one per cent or more of total « stock. Lf not owned by a corporation, the names and addresses of the individ must be given. If owned by a firm, company, or other unincorporated name and address, as well as those of eac! individual member, must be giv Windsor, 200 East Ontario St., Chicago, Lil; H. MH. Windsor, Jr, 200 East O Chicago, Ill Third That the known bondholders, mortgagces, and ot! ne holders owning or holding 1 per cent or more of total amount of bonds, mortgages other securities are: (If there arc none, so state.) None. Fourth. That the twos craphe next above, giving the names of the owners, stockholders, and securit . if any, contain not only the list of stockholders and sccurity holders as t pe upon the books of the company but also, in cases where the stockholder holder appeare upon the books of the company as trustee or in any ot) fiducia relation, the name of the person or corporation for whom euch trust » acting given; also that the said two paragraphs contain statements embracir knowledge and belief as to the circumstances’ and conditions under wh holders and security holc wh ear upon the books of the « trustees, hold stock and ser in & capacity other than that of bona fid and this affiant has eason to believe that any other person, associatior rr n haa any interest direct or indirect in the said etock, bonds, or other than asso stated by him. H. H. WINDSOR, Jr Editor and Busines Sworn to and subscribed before me this 28th day of March, 1928 J. ¢ Notary Public. (My commission expires June 17, 1928) PREPARE FOR AN ART career thru the only art school operated as a department of a large art or- ganization, who have actually pro- duced over a quarter million draw- ings for leading advertisers. Where else can you get so wide an experi- ence? Home study instruction. Write for illustrated book telling of our successful students. MEYER BOTH COMPANY Michigan Ave. at 20th St. Dept.16.Chicago, Ill. Windsor, Jr ») Ean

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seowee™ ’ sed || tion i. 2 City | I } persor wd ior st I I L.K.W J x ory t v d et at ¢ ot » r th . le t ei 1 wi af tor th — > ” advance, to take charge 1 and construction work of vp MAES Drexel Ave. & 58th St., Chicago POPULAR MECHANICS ADVERTISING SECTION 15 If You Were Dying od | offered something that would give you ten years ‘ _ would you take it? You'd grab it. Well, got it, but don’t wait till you're dying or it 1a bit of good. It will then be too late. Right time. Tomorrow or any day, some disease will t 1 if you have not equipped yourself to fight it oft re gone. I don’t claim to cure disease. I am not ii ijoctor, but I'll put you in such condition that ctor will starve to death waiting for you to take ok you imagine ‘a mosquito trying to bite a | ick wall? A fine chance. A RE-BUILT MAN get the weak ones. I delight in getting hold of a has been turned down as hopeless by others. enough to finish a task that’s more than half tut give me the weak, sickly chap and watch him er. That’s what I like. It’s fun to me be- Ik v I can do it and I like to give the other fellow I don't just give you a veneerof muscle that \ {to others. I work on you both inside and out. I not put big, massive arms and legs on you, but | those inner muscles that surround your vital The kind that give you real pep and energy, the fire you with ambition and the courage to ything set before you. ALLI ASK IS NINETY DAYS 14 t ys it takes years to getin shape? Show me the vho makes any such claims and I'll make him eat his I'll put one full inch on your arm in just 30 days. Ve i two full inches on your chest in the same length Y Meanwhile I'm putting life and pep into your id back-bone. And from then on, just watch 'em grow. \t the end of thirty days you won't know yourself. Your dy will take on an entirely different appearance. t 1've only started. Now comes the rea] works. I've built my foundation. I want just 60 days more (90 id you'll make those friends of yours who think trong look like something the cat dragged in. A REAL MAN When I'm through with you you're a real man. The kind that can prove it You will be able to do things you had hourht impossible. And the beauty of it is you keep on Your deep, full chest breathes in rich, pure air, stimu sur bloed and making you just bubble over with vim nd vitality Your huge square shoulders and your massive lar arms have that craving for the exercise of a regular You have the flash to your eye and the pep to your t will make you admired and sought after in both the J s and. social world Thi no idle prattle, fellows. If you doubt me, make me pr t. Go ahead, I like it I have already done this for tt inds of others and my records are unchallenged. What I ne for them, I will do for you. Come then, for time hes and every day counts. Let this very day be the beginning of new life for you ake have d ‘ It contains over four dozen full-page photographs myself and some of the many prize-winning pupils I have trained. Some of these came to me as veaklings, imploring me to help them. Look them over 1 you will marvel at their pr.sent physiques. This book rove to be an impetus and a real inspiration to you. It rill you through and through. And it's all yours. I don’t ent. This will not obligate you at all, but for the sake of ture health and happiness do not put it off. Send today now before you turn this page. Earle E. Liederman Dept. 2006 305 Broadway, New York City TONIGHT —_— EARLE E. LIEDERMAN, The Muscle Builder Author of ‘‘ Science of Wrestling,”’ ‘‘ Muscle Building,” “Secrets of Strength,” “‘Here’s Health,” “‘Endurance,”’ etc. Send Forlty New 6 * Page Book. IT IS FREE ” | DONT SEND ONE | PENNY | ear sir: Pi i aaa Tia ae | ~—~ | paar beet took, “Musnter Deven I EARLE E. LIEDERMAN Dept. 2006, 305 Broadway, New York City YOUR | ment Pleas rite or print plainly.) NAME |. | AND he ; ADDRESS ONA | Street | POSTAL | | WILL DO) ci Stat ie citcie: aie-dadkipeuncintantas gn sep aaetentapeneeineienaeeennal

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16 POPULAR MECHANICS ADVERTISING SECTION

Know Electricity as Experts Know It./

HIS is the electrical age, with unlimited opportunities for the man who has educated himself in the finer points of electrical practice. Fit yourself for one of the really big jobs by knowing electrical practice complete, including inside and outside work, central stations, and the whole subject. With the aid of the Croft books you can know electricity as experts know it and put yourself in line for an expert's pay. The Croft Library of Practical Electricity A reference library and self-training course in eight volumes. 3000 pages —2100 illustrations In these volumes Croft teaches you electrical practice complete. He takes you in quick, easy steps from the simplest principles to the com- plete and economical operation of a great central station He tells you all that he has learned in twenty years of shirt-sleeves practice. With these books at his elbow a man can learn as much about electricity in six months—good prac- handling , . tical “bread and butter’ stuff—as he would : ordinarily learn in a lifetime of practice. - The Standard in Practical Electrical Training The Croft Library is a complete electrical educator. It is founded on practice—on work as it ts actually done. It is jammed from cover to cover with the kind of hard-headed facts you want. Written so that the beginner can easily understand it, yet so sound, so thorough, that it is the daily guide of 59,000 highly paid electrical workers and engineers Croft tells you the things you need to know about motors, generators, armatures, commutators, transformers, circuits, switchboards, dis- tribution systems—electrical machinery of every type—wiring for light and power—wiring of finished buildings—underwriters and nunicipal requirements —illumination in its every phase—the latest and most improved methods of lighting —lamps and lighting effects, etc.—how to do a complete job, from estimating it, to completion. No Money Down 10 Day 3\Small Monthly Payments FREE TRIAL Just Mail t

Flexible binding for easy

Fill in and mai! the coupon attached and we will send you the entire set of eight volumes for ten days’ Free Examination. We take all the risk—pay all charges. You assume no obligation—you pay nothing unless you decide to keep the books. Then $1.50 in ten days and the balance at the rate of $2 a month. Send the coupon NOW and see the books for yourself

FREE EXAMINATION COUPON McGRAW-HILL BOOK CO., Inc., 370 Seventh Ave., New York Send me for 10 days’ free examination the Croft Library of Practical Electricity. If satisfactory, I will send you $1.50 in 10 days and $2 monthly until the special price of $19.50 is paid If not wanted, I will return the books at your expense. (To insure prompt shipment write plainly and fill in all lines).

stoned Address Ctty and State Position ® Employer

98 Healthful Outdoor Work. Travel =—4a$ Your Own Boss— No Selling NO HUNTING FOR JOBS 3 Is Every graduate is assisted to a posi- tion as Traffic Luspector paying at ¢ sles ast $120 a month to start, plus ex- C. © Apenses, or tuition money is refunded. \"RNo strings to this understanding. There }, Are actually more traffie inspection jobs 4) Waiting for graduates than can be gfililed. It is common knowledge that transportation companies prefe, men with SBTI training Three months apare time study and

t immediately on a fascinating, profitat ar 1 in traffic inape tion ~one Of the few us rowded : professions oftoda . : . : ‘ Aon tradi inaps tor you willtravel ur own ’ aap Enjoy > deat } : a4 eneteey « walls oe aty to confine ver-< agi nor f interesting scenes an iDi ~m faces and new species Every day of your life "ll find new

pleasures in your Z rk Earn UpTo $50 ,! Month With alittle experience you will be rapidly advanced to

$160, $185, $200 and £259 a month plus expenses, as our graduates are doing every day. The very nature ofyour worl motion, officials. Write for Free Booklet telling of the actual success es of our many graduates during the last nine years Andread for yourself the tui- tionrefundcontract thatgoes with every course to make your future a certainty Standard Business Training Institute Div.2 Buffalo, N.Y. BE AN ARTIST YOU DRAWING in your own home during your Spare time. Twenty-five years of successful teaching proves our abil- ity. Artiste receive large salaries. Write Today for Art Year Book SCHODL“APPLED A ART ; Room No. 2 CHEMISTR Complete, practical R study courses prepared by some of the st-known chemists in this country, including ALLEN Rocers, B.S., M5 Ph.D.—Head of Department of In dustrial Chemistry, Pra Institute; L. M. Totman Ph.D.—Formerly Chie! Chemist, Wilson & Co. Now Vice - president, Uni Chemical and Or Products Co.; Brapiey StoucnuTon, BB» Head of the D aids rapid pro You report to high

ment of Meta Lehigh Un versil ’ — Owen L. SHINN D —Professor of Applied Chemistry, University of Pennsylvania Mail Coupon for Free Booklet ee ee INTERNATIONAL SCHOOL OF CHEMISTRY Associated with the International Correspondence Schoo!s Box 5540-F, Scranton, Penna. Without cost or obligation, of your home-study course in (CD Analytical Chemistry DO Metallurgical Chemistry CL) Chemical Engineering () Short Chemistry Course CJ Industrial Chemistry LJ Pharmacy please send me full details Name Ee eer a nae

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POPULAR MECHANICS ADVERTISING SECTION 17 be ledge prefe, ind start 300% Increase $8 to $125 a Week $7200 a Year 600% Increase fitab Care . . w us rowded “My salary since Len- “I came to this country At the time I started “Six years ago I was a » rolled with the N. 8. T. in 1919, being for some N T.A. Training my stenographer Now I ! ur own A. has increased over 300% time unable to speak or ong income was less than am in the advertisin ‘ere jaunt and I d t intend to stop at the English language S15 > , " r, j e ‘ na ae tat. Las formes employed worked naa dichwaeher at $8 oo er month, Xow it business for my ee an ee to confine in a Creamery ing ri ob, i four times that. Ifeelthat my earnings have in- D2 norama d healthy work “A., ™Y_taerease from $1800 to creased 600% The places. Now have charge of 14 1 Now i over 87 00 per year ts monty lestraining and co-0f f x Eve oy er i a a e id du to eile at te Saar wr | ir - row t : A pring mu . on a eceived f he " “li find eat wanting to become a ‘ was , Yo a Bt developed the self-confidence should take the N.S. T. A orkin restau- Youre! a nat nevi = eet ability that I needed to Pp course A. F. Thompson, at!"*"—Mar richievich, de Mt i D. Mather, Riche ™®ke good.” H. 1 er Sioux City, lows Cal dt, ‘Chicago, Illinois Month rience you ivanced to and $250 Penses, as are doing Cry Nature rapid pro- ort to high Youre Fooling Yourself -if You Think These Bid Pay ‘or klet al success eTaduates ine years. elf the tui- *t thatgoes e to make tainty onl Records Are Due to LUCK! stitute J.E. GREENSLADE as. | 3ut don’t take my word for it! When I tell you that you can increase your earning power. I'LL PROVE IT! FREE! I'll show you hundreds of salesmen like yourself who have done it. And I’ll show you how you can do it, too! LL COME directly to the point you have mastered these fundamental | First you'll say, “I could never do - rules, your success is governed only by your 7 energy and ambition. ese salesmen were lucky. But j “ raya le “~~ ee oe these are only four out of oa 88 FOR See wae See . , can learn salesmanship And through tl is. And if you think it's luck that NATIONAL DE MONSTRATION MI TH ienly raised thousands of salesmen OD—an exclusive feature of the XN T System of Salesmanship Training you Eo a direct knowledge of the actual making of sales while studying The N. ®. T. A. System of Salesmanshin Training and Employment Service has en- big-pay class—YOU'RE FOOL- 7, ‘G YOURSELF Easy to Increase Your Pay — But let's ge . , »2aP Tow Q mas i ge Gos $07 hon % Yor want abled thousands of men to step into the ranks os * Bhs mfor a ile —_ 2 » Seams 4 of successful salesmen—will give you a big th edvatites ¥ “ ~ mg l -¥ — advantage over those who lack this training , i K aa 2 ghase of ienportanes in your Sa ee re-study ’ ] . a real man’s > 2 ome , yd . ity. All these can be yours. And 1 rea: nan eneoun e of t I'll prove it to you free! With my compliments I want to send youa nt 7 4 ‘ > ° » oe First, get this one thing right. There's a surprising number of most remarkable book, “Modern Salesmanship.' ep © g : year salesmen. But why is it that thousands of other men nt of In ely able to make a living? Simply because they enter Remarkable Book Sent Free ng fleld without scientific knowledge of selling! They irely on native ability to forge ahead. It will show you how you can become a Master Salesman—a big “OL MAN ¢ TOLMA moneymaker— how the N. 8. T. A. System of Salesmansiip Training y Chief Compare that type with the MASTER SALESMAN whee will give you the advantage over many men who have had years of Co. Now run into five figures a year. He is made of the same ; ~ selling experience. How ovr FREE Employment Service wil! help t, United rand I. But he has won success because he has le eg +“ you select and secure a good selling position when you are qualified | Organi with any situation: how to batter down yoo \ sbi and ready. And it will give you success stories of former routine BrabLeY 1¢ competition; how to make others act for mutual | : workers who are now earning big money as salesmen. Mail the attached coupon at once and you will have made the first long stride Bs ' Simple as A.B.C. toward success D t oe eee eee ee ee ee ee ee ee ee ee ee ee ee ee ee etallurgy, T Association takes men of average intelligence—regardless of 2 sity, and eir lack of selling experience—and develops them into MASTER | a a oy Salesmen's 1 PhD \LESMEN,. You may think itremarkable. Yet there is nothing | N.S. T. A. Building eet | iN, | ied markable about it. Salesmanship is governed by rules and laws Chic ago, Illinois. i f Applies here are certain ways of saying and doing things, certain ways of | Send me your free bool ‘Modern Salesmanship,”’ and niversity ‘pproaching a prospect to get his undivided attention, and once | proof that I can become a MASTER SALESMAN. i —_ i. | Ni >. "heen wTTiTeT i : Y ume | thools | ] Address | etaila | | | State “a | | City . . . - tea ! e Dept. G-100 1 _ Occupation ! | N.S. T. A. BUILDING CHICAGO, ILLINOIS Da ee ee a ee —----!

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Make BIG MONEY—Spare-Time or Full- Time—with Hawaiian Guitar time aa ofevery party—be paid h ig for your Hawaiian el) Gr eek and upezira is me afew r add Mie V y r passport to popularity fun andphnat of EXTRA DOLLARS! . No Musical Knowledge Needed; Learn * Quick Right at Home in | to 3 Months it re ad ng nc ee: few « f My: dex- ing. No ha ractice scales ‘ y “Had learned ; torn a ct age only a few can actually be playing for 3 chords when I Ll prove was asked to Met my FREE " bel lay atadance. Received six- teen dollars ($16) for one night's play- ing.” R. A. Prutzman, Lehighton, Pa “Only quarter way through course and already playing 3 evening#® & wee spare-time for$10." Krulichi, Kit- chener, Ont., Can PHONOGRAPH RECORDS and Complete Outfit at No Extra Cost In addition to beautiful Hawaiian Guitar — Complete Outfit — easy les- sons and instrue- you tions YONI ( EXTRA COST to you! FREE BOOK Shows You How Every plained thing is ex- every last bit of A. F. Bloch, President, Hawaiian Studios 52068 of New York Academy of Music. 100 Fifth Avenue, New York City. Without obligation, send me FREE Book ‘How to Learn Hawaiian Guitar,”’ with facts on how I can make BIG MONEY spare-time or full- time Name Address — ee ame ee ee me ee ee ee ee ee ee ee ee ee d POPULAR MECHANICS ADVERTISING SECTION Extra Each Week THE CHICAGO DAILY NEwWs School and College Bureay Offers You Its Specialized Services in Choosing a School 7 year the Schooi and College Burea, The Chicago Daily News saved many on parents and questioning boys and girls both time and worry by sending them prompt, reliable information about just the kind of school they wanted personal requirements as to location and tuition charges being considered in each individual case. Again this year many young people will be perplexed by the problem of finding the right school. Why not let us help you ? The Chicago Daily News maintains this service absolutely free of charge to you No need to hurriedly select a school mere hearsay when expert advice can be obtained by telephoning Dearborn 1111, writing or calling for a personal interview at || THE CHICAGO DAILY NEWS School and College Bureau Dept. K, 15 N. Wells St., Chicago, Illinois ECTRICAL TRADES xe ees nl on Massive Lay-Out of Expensive Electrica Equipment. Armature Winding, House Wiring, Electric V Electric Refrigeration, Power Plants,Switch boards, Transf« tors, Generators, Radio Batteries, Automobile Course included wit out extra cost. Write Today for Free Catz log COLEMAN ELECTRICAL SCHOOL. 1628P MainSt..Kansas City Missou is TRAVEL rmers.\ New Bandit Proof Railway Mail Car U.S. GOVERNMENT JOBS $1140 TO $3000 YEAR Men— Boys, 18 Up ee eee ee ee ee ee Po FRANKLIN INSTITUTE | Steady Work 4 . DITZ, Rochester } Pai : Yd Ge ntlemen ooo to me with« j aid Vacations o* 32-page book with list of | | Common Education gO mnt Die, id “rie ott Usually Sufficient ° salaries, hours, duties, vacation and f | Mail Coupon © ulars. | —Today 7 Name | SURE Ps Address. .

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wii NEWs 1reay iene “dd hool ureay Many > and nding ibout ted ! and each [llinois

<—S Electrica ic We'd ormer { luded wit ity Missour /EL Incle am”

ester, N.Y he

‘Heres the PROOF Made $185 in 3 Weeks" | Spare Time rm I have met with ued

a vine Ap rk ) esr € tanking good | Sneat fi ‘ | enrolled. T! I e ont solid ae I J ‘ ' s id Mode $588 in 1 Month truin-

$588 i ving 6 * ple i k «i ! v andle of « b alo . ere rt Reese, 2215 & Street, Elwood, Indi-

Earns Price of Course in One Week Spare Time I have been #0 busy with jio work that I have not sd time to study The er week, in spare time rned eno

arn

POPULAR MECHANICS ADVERTISING SECTION 19 | Will Train You fa at Home to Fill Big-Pa (SZ RadioJo If you are earning a penny less than $50 a week, send for my book of information on the opportunities in Raaio, It's FREE. Clip the coupon NOW. A flood of gold is pouring into this new business, creating hundreds of big pay jobs. Why go along at $25, $30 or $45 a week when the good jobs in Radio pay $50, $75 and up to $250 a week? My book “Rich Rewards in Radio” gives full ine formation on these big jobs and explains how you can quickly learn Radio through my easy, practical home- study training Salaries of $50 to $250 a Week Not Unusual Get into this live-wire profession of quick success. Radio needs trained men. The amazing growth of the Radio business has astounded the world. In a few short years three hundred thousand jobs have been created, And the biggest growth of Raaio is still to come. That's why salaries of $50 to $250 a week are not unusual Radio simply hasn't got nearly the number of thoroughly trained men it needs. Study Radio and after only a short time land yourself a REAL job with a REAL future You Can Learn Quickly and Easily in Spare Time Iiundreds of N. R. I. trained men are today making big money—holding down big jobs—in the Radio field. Men just like you—their only advantage is training You, too, can learn Radio just as they did by our new practical methods. Our tested, clear training makes it easy for you to learn. You can stay home, hold your job, and learn quickly in your spare time. Lack of education or experience are bo drawbacks. You can read and write That's enough. Many Earn $15, $20, $30 Weekly On the Side While Learning My Radio course is the famous course ‘that pays for tself.." I teach you to begin making money almost the day you enroll My new practical method makes this possible. I give you SIX BIG OUTFITS of Radio parts with my course You are taught to build practically every type of re- eeiving set known M ». Sullivan, 412 73rd Street, Brooklyn, N. Y., writes, “I made $720 while studying.” Earle Cummings 18 Webster Street, Haverhill, Mase: “I made $375 in one month.” G. W Pa 1807 Ziet Ave., Nashville, Tenn time while studying.” Your Money Back If Not Satisfied I'll give you just the training you need to get into the Radio business My course fite you for all lines— manufacturing, selling, servicing sets business for yourself. operating on board ship or in st and many others. I back up my training with « sign fund every penny of your money if, after completion you a with the course I give you. Act NOW—64-page Book is FREE Send for thie bie book of Radio in- formation t won't « , It has put hundreds of fellows on the

= me ‘I picked up $935 in my spare

road to bigger pay and auccess. Get it. Investigate. See what Radio has to fer you, and how my Employment Department helps you get inte Radio after you graduate Clip or t the coupon and mail it RIGHT NOW J. E. SMITH, President, Dept. 6-H, National Radio Institute Washington, D. C.

a You can build | 100 circuits with

30f the 100 you can teaid aa

Mail This FREE COUPON Today J. E. Smith, President, Dept. 6-H. National Radio Institute, Washington, D. C. Dear Mr. Smith: Kindly send me your big book “Rict Rewards Rad giving infer yn the big-money opportunities in Rad and practical method of teach- ine with aix bie Outfits. I derstand this book ia free. and tha : aces me und obligation whatever

No Ao

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20 POPULAR MECHANICS If You Want a Job 4_ and Keep Your OwnHours | 6:1) learn Illustrating hp Our new catalog ‘A Road to Bigger Things” tells you how. You will also be interested in the illustra- tions and comments by Nevsa McMein, Levendecker and other nationally known artists who are among the Federal authors and contributors. Write your name, age and address on the margin of this page. Tear it out and mail it to us and we will send you your copy. | je Iilustrating 6138 Federal School Bldg., Minneapolis, Minn. ADVERTISING SECTION WITH THE Learn to Fly *s:srcn ON GOVERNMENT SUPERVISED FIELD Transportation Free to Kansas City from Chicago, St. Louis, Detroit, Tulsa, Denver— to those who enroll. QUALIFIES for private pilot (15 how fiving); limited commercial license (50 hours’ flying), and Transport Pilot (209 hours’ flying). Department of Commerce li cense. Use Safe New Eaglerock planes, trans port pilots instruct you, thore ground mechanics, all di flying ycu want free. Aerial photography, map & compuss flying, ete. A practical course for Commercial WORK FRE E Simply send name for complimentary 1 entitling you to free tripin Eagler pl and full details of practical instruction commercial flying BENNETT FLYING SCHOOL | | Write 223 West 12th St., KANSAS CITY, MO. () Hotel 1: J =— Positions Open: OTELS, restaurants, clubs, apartments, hospitals, instituti schools and colleges everywhere need trained men and won Over 70,000 high-class positions paying $2,500 to $10,000 a year o} annually in the hotels of the United States. Nearly one and tt quarter billions of dollars’ worth of NEW HOTELS, CLUBS A> INSTITUTIONS being built this year will need over 200,000 trair men and women. Hotels start you at salaries up to $3,500 a ye with living usually included. At any time there are over 1,000! positions open Previous Experience Unnecessary You can have one of these fascinating, big-pay posit‘ons. 7 our Simplified Study Plan we give you the valuable know! some of th ul tel e ‘ it hae taken nost # onf men y bt Ae obs ~young and olc t al char for enc r y A ed t e all v you int with bx por ion of Cl d Lewin, M P By w we ween abbtnkclon one bent tnenk parenteral ’ , BOOK COU PO New qe cee ee ee ee =) LEWIS HOTEL TRAINING SCHOOLS, | Room AW-385, Washington, D. C. | Send me without obligation the Free Book ‘Your Big Opportunity : | | | Name.. . | ccesecce | | Addreee | | State mi! SP! Lo tou

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H THE SPOR rs FIELD $85 aWeek SOY Success + . inl > ome : : Y 4 Lesher! “ Before starting your course, did not know a thing about the Tenor Banjo, but within one month after I re- ceived the first lesson, I was playing with a very good dance wrchestra. The course was so easy to understand that my progress was very rapid.’’"—L, V. Lesher, Braddock, N. Dak, music, but I ing. —_— Mich “Before taking up your course, I was making $18 weekly as a clerk and knew nothing about made ‘paid’ performance in less than eight weeks after starting day I owe my salary of $55 a week as a professional Tenor Banjoist to your excellent train- o Kenneth Parkview Hotel, South Haven, POPULAR MECHANICS ADVERTISING SECTION 21 » Over $278 in SpareTime for McGriff! >. if “When I or- dered your Ten- or Banjo course I had never had my hands on a Banjo I now have a $278 Banjo bought with extra money made by playing. Now also play weekly at the picture show and for dances at our country club, too. ’’—J > McGriff, Hawkins- ville, Ga. my first To- McCarty, The Book that started Lesher McGriff and McCarty is Now ROBABLY like thousands of others whom I have helped find themselves, you have always thought t nor Banjo as just a pastime—just a remarkable, melo- trument for those who have “talent.” .. . . But stopa minute and think of earning $15, $20 or $25aweek EXTRA SPARE-TIME MONEY for two, three or four nights’ fun! Look at the men pictured above. None of them had ever touched a string@—ever read a single note. I'll Train You at Home in 1 to 3 Short Months YOUCAN DO what Lesher, McGriff and McCarty have done! Many of my students get off their first tune within half an hour after they re- ceive the big Tenor Banjo you see pictured here. It isn’t hard or tedious; instead it’s like learning a game. Not one thing stands between you and popularity, good times, scores of new friends—and big EXTRA PAY. Phonograph Records Included, Too— With your very first lesson I send you this full pro- fessional size Tenor Banjo; Phonograph records demonstrating every selec- tion in the course: Banjo Pick, Tuner, ExtraStrings Gain-Time Chart to help you quickly learn notes Everything you need to learn—everything you need AFTER you learn. Mail 7 the coupon TODAY. | A. F. Bloch, President New York Academy of Music Studio 1068 100 Fifth Avenue NEW YORK CITY Ready for you / “The Play-Way to Popularity and Big Pay’’—that’s the FREE book I want you to have. It will open YOUR eyes—just as it did for Lesher, McGriff and McCarty. What- ever you’ ve thought about your oppor- tunities and advan- tages as a Tenor Banjoist before— you'll think again the minute you lift the cover of this remarke able FREE book. It has been the start for hun- dreds who today are en- joying more fun, popular- ity and prosperity than they ever dreamed could be possible. Don’t pass this page until the coupon’s ready to mail. j A. F. BLOCH, President, New York Academy of Music ] Studios 1068, 100 Fifth Ave., New York City. l I'd like to know more about The Play-Way and about my opportunities as a Tenor Banjoist. I'm ready NOW for my 1 copy of your FREE book. 1 i I l Name. Address

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22 POPULAR MECHANICS ADVERTISING SECTION High School Course in Two Years! You Want to Earn Big Money! And you will not be satisfied unless you earn steady pro- motion. But are you prepared for the job ahead of you? Do you measure up to the standard that insures success? Fora more responsible position a fairly good education is necessary. To write a sensible business letter, to prepare estimates, to figure cost and to compute interest, you must have acertain amount of preparation. All this you must be able to do before you will earn promotion, Many business houses hire no men whose general know- ledge is not equal to a high school course. Why? Because big business refuses to burden itself with men who are barred from promotion bythe lack of elementary education. Can You Qualify for a Better Position We have a plan whereby you can. We can give you acom- plete but simplified high school course in two years, giving you all the essentials that form the foundation of practical business. It will prepare you to hold your own where competition is keen and exacting. Do not doubt your abili- ty, but make up your mind to it and you will soon have the requirements that will bring you success and big money. YOU CAN DOIT. Let us show you how to get on the road to success. It will not cost you a single working hour. Write today. It costs you nothing but a stamp. American School __ Devt. pt. H 574, | Drexel ol Ave. and 58th St., Chicago American School Dept. H-574, Drexel Ave. and 58th St., Chicago Send me full information on the subject checked and how you will help me win success. ....Architect ...-Building Contractor ....Automubile Engineer ...-Automobile Repairman ..-Civil Engineer .... Structural Engineer .... Business Manager ...-Cert. Public Accountant ....Accountant and Auditor ... Bookkeeper ... Draftsman and Designer ...-Electrical Engineer ....Electric Light & Power ..Business Law ...Lawyer ... Machine Shop Practice ...-Mechanical Engineer ... Shop Superintendent ...Employment Manager .. Steam Engineer “oremanship .. Sanitary Engineer : Surveyor (& Mapping) . Telephone Engineer .... Lelegraph Engineer .. High School Graduate ...General Education ...Wireless Radio .. Vocational Guidance .. Undecided ree Se eT re ee eee e SR ubth teeaubiesidtwsadsaawen BLISS ELECTRICAL SCHOOL Condensed Course in Theoretical and Practical Electricity A-special technical school, with comprehensive course, ELECTRICAL men with training are in demand. Since 1893 this school has been training men b ambition and limited time for the electrical industries, Condensed course in Electrical Dagens pal enables as to secure good positions and pron Mathe ics and Mechanical Drawing Student nstruct motors, ‘install wiring and test electrical machinery Regu lar course designed to be completed in one college year. Over 5000 men trained Thoroughly equipped e-pr dormitories, dining hall, laborat shops Prepare for your profession. in _ most oo’ city in the world. atalog on re s BLISS ELECTRICAL SCHOOL 116 Takoma Ave., Washington, D. C. LEARN WATCH REPAIRING Be a watchmaker—you can learn this profitable trade by correspondence in a few weeks in your own home by the DeSelms Chart System. After you complete the course you will know & watch from AtoZ. You will know just what the matter ie and how to repsir one. When you eraduate you will be a practical watchmaker and repairer and compe- tent to fill any position Positions for our graduates. Ask for eur Free Book. {tf explains our system and terms. THE DeSELMS WATCH SCHOOL LOGANSPORT, INDIANA th e quickly teach you a bm or at jj Oe in , °F ‘Enor- | future. Inter- | oremost school. yer To $200 WEEKLY gets $25 for single show card. Barnet S00 while taking course.’ jes and tee. DETROIT ScHooL 0 OF LETTERING 154 Stimson A 1899 Detroit, Mich, Make money taking pictures earn while you learn. else tike it. Send at once for free book. PHOTOGRAPHY and full particulars AMERICAN SCHOOL OF PHOTOGRAPHY 3601 Michigan Ave. Chicago, U.S.A Write for my free book “‘Millard’s Advanced =» Natural Corrective Course’’ and a free copy ol my speech magazine. 10,000 cases successfully treated Est. 24 years. Largest school for stammerers in world. Millard lost. of Normal Speech, 2317 Millard Bidg., Milwaukee, Wis. Prepare — Eo Be. yo — experience necessa et "opPoRTUNITIES in “MODERN Dept. 135-A Results Quick—Part or Full Time Take up poultry raising. It’s interesting, ! ful, PROFITABLI Easy to sell all you ca! duce at big prices. Our new course by Henry M. Lamon gov't expert, gives short cuts to success. Write for free book to Raise Poultry for Profit.” NATIONAL POULTRY INSTITUTE, Dept. 411, Washington, 0. ©

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urse, } school r the =r.hU ’ t ' sion in } world,

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POPULAR MECHANICS ADVERTISING SECTION 23 came near being a chair-warmer for life —when suddenly I learned how easy it is to be popular... Who's dead, Don? Why don't you “Who said these things were join in the fun—this is no funeral— pecessary?”’ “Well, aren’t they?”” Now I | tried hard to smile. “‘’'menjoy- was becoming curious. it's a party.’ ing myself a lot, Ray,” I lied. “Of course not. I learned to “Well, why don’t you dance dance right in my own room with- en—just look at all the charm- Out music or partner. And it only ¢ partners here tonight ... cost mea few cents a day.” lar live! if you don't brace up ““Vou're kidding me,” I sc offed. u'll be a chair-warmer for life.’ ‘I'm not fooling. And to prove Ray hit the nail on the head. it I'm going to write to Arthur ly only fun at a dance was a Murray, who made it so easy for ‘ke with the boys. When the me to become a good dancer, and ic started I was invariably on ask him to send you 5 lessons from e sidelines. Now and then I'd his famous set of home instruc- “cet by’ with the latest tions. I'll wager at the next party tep But I was so clumsy. [ you won't want to sit out a single ped. I knew that I continu- dance.” tell out of step. A Short Cut to r | ever accepted nd Trew, | if You Can 4 Popularity Ang never . -d her. This Step Ray was right. ‘

Ray's remark Arthur Murray will When the five lessons a sore spot. make you a finished arrived I was So | blurted out my dancer in 90 days. enthusiastic. Arthur le hey of woe to Murray's simple in- = ne eg - . structions worked e like yo Z f you, Way, marvels for me. Ina | be a happy fellow. what’s the use? vould take months e to learn the few short evenings | had learned many of the very latest dance rut

test steps correctly steps and within a ada — oases month every one ad expe sive fees that <=—____—_- mitted that I could rivate teachers FoMSW SENSORS hold my own with the 6 ~~ best of the dancers.

Arthur Murray certainly took me out of the wallflower class and put me in the whirl of things his story is typical and it how vou just the chance you've been looking for hance to become an accomplished dancer right in your home at asmall cost. No matter how poorly vou dance now —no matter f{ you've never been on a lance floor in your life—Arthur Murray's new method makes you a finished dancer in ten days or you don't have to pay a penny for the lessons. You can learn right in your own room without music or ) t T Just think! In ten days’ time you'll be ble to do the French Tango, the Fox Trot, the Waltz and all the other smart Five Lessons FREE To prove that Arthur Murray can mak ou a finished dancer in ten days’ time, he is willing to send you five lessons from his remarkable course absolutely free! Just send the coupon (with 10¢ to cover cost of printing and mailing) and these valuable lessons will be forwarded itor Also a free copy of his new book, The Short Cut to Popularity; Mail co NOW Arthur Murray, Studio 822, 7 East 43rd Street, New York City. SSSeeeeeeeeseeteeeee . Arthur Murray, Studio 822, 7 East 43rd Street, New York City. To prove that Icanlearn to dance at home in ten days you may send the FIVE FREE

LESSONS. Lenclose 10c (stamps or coin) to pay for the postage, printing, et¢ You are to include free ““The Short Cut to Pop- ular Name Add ( y State

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- ¢€ It will be easier than fish- ing for you to earn money and win prizes. Here’s your chance to score the Catch of the Season by joining up with the Crowell Junior Salesmen who are lively and peppy fel- lows just like you. Every week Crowell Junior Sales- men deliver three of the best known mi — s to regular customers. It takes but a few minutes of their spare time. You can do the same and score a catch of money and prizes and vi ry easily, too. Mr. Jim Thayer, Dept. 64 The Crowell Publishing Co. Springfield, Ohio. Dear Mr. Thayer: Show me how to catch money and prizes My Name Address Town State POPULAR MECHANICS ADVERTISING SECTION I Teach ' Mail Begin Today—Write for My FREE Book, I can make @ goud penman of you at home during spare time Write formy FREE BOOK, How to Become a Good Penman.’ It contains specimens and tells how others mastered penmanship by the Tamblyn System. Your name will be elegantly written on a card if you enclose stamp to pay postage. Write today for book. F .W. Tamblyn, 418 Ridge Bidg., Kansas City, U.S.A, Learn Auto Mechanic, Auto Electrical Battery, Haw _ ey a hanic, Tiling, ic e "lumbing, Wek Drawing Estimating Show Card, Sten Painting Window Dressing, Fine And Commeryial Art Write for Catalog 50 BROOKLYN ENGINEERING INSTITUTE (Operated by Bedford Br. Y. M. C. A 1125 Bedford Ave.. Brooklyn. New York City MUSIC LESSONS voix HOME Write today for our FREE booklet. It tells how to learn to D a Piano, Organ, Violin, Mandolin, Guitar, Banjo etc. Beginr advanced players. Your only expense about 2c per day for mus and postage used. American Schoo! of Music, 51 Manhattan Bide Chicage Learn Watchwork, Jewelry work and Engraving A fine trade command a good salary, and your service alwaysindemand. Addres: Horological, Dept. P. Brack Institute, PEORIA, ILLINOIS, for our latest catalog A GREAT BOOK FREE WITH THIS LIBRARY! For a short time only we will give every subscriber to the New Library of Machine Shop Practice a copy of French's Engineer- ing Drawing—the greatest book on mechanical drawing ever written. Thisbook makes drawing as plain as day and prepares you to handle any drawing job you will ever have tod It comes to you absolutely free with Machine Shop Practice 9 volumes— 3065 pages— 3608 illustrations (A combined home-study course and reference library) The Machine Shop Library was writien for practical men. It gives you the best methods for every kind of machine shop work Itexplains machine tools and their operation, drawing and desiz! tool work, gears and grinding, jigs and fixtures, automat ew machines and their toows and all of the mathematics you © f need. Plain'y written, completely iliustrated—the best kind of to the machine-shop man who wants to advance himself No money down— only 7c a day E EXAMINATION COUPO! McGRAW-HILL BOOK CO., Inc., 370 Seventh Ave., New York Send me for 10 days’ free examination the Library of Machine Practice If satisfactory. | will send $2.50 in 10 days and $2 month! the special price of $22.50 is paid lf not wanted, I will return the t at your expense On receipt of my first payment I am to receive, fre charge, a copy of French's Engineering Drawing lFRE| PRs vccconcesssuesicdvicocwcseseecesvetsntes eeneesnoesbese , City and State Position....... | | i | | | | | | | | j | ! | ' Sale. Pa

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ic Tiling Weldin » Painti ™ erctal Art STITUTE A fork City the New Nngi neer- ing ¢ pre pd ce ations ibrary) wn— ly 7c a day > ON York POPULAR MECHANICS ADVERTISING SECTION 25 opportunity of the age awaits YOU Your “Big Chance” Calls for Complete Practical Training Get It from a Company Actually Engaged in Air Transport Service en who complete the necessary training now will position to take advantage of the present tremen- s demand for aviators, ground mec, etc., in this tast- ving, potentially greatest of all industries repare yourself for Aviation’s wonderful opportunities ring training that is PRACTICAL andCOM PLETE ire going to make the most of your “ Big Chance YOUR COURSE MUST INCLUDE: Aerodynamics Aerial Navigation Airplane Shop including Mechanics Meteorology Aircraft Motor Flying Mechanics Commercial Phases Simply learning to fly is not enough. Even to secure a sport pilot's license you must pass satisfactory govern- t tests in the first four subjects above, as well as know w to fly Ss. T. ¢ ourse covers all of the above training—simpl« 1 for the ymmon school graduate and sufficient for the man—in “the shortest possible safe time from the largest ons sible transport-training company in Chicago Home Study and Actual Flight Training 1 can learn the fundamental principles and practical phases short time at home, finishing the entire ground work under home study plan, and then come to Chicago for shop practice and flight training in day or night classes our great city airport, the hub of the nation’s aerial s, where our own large, modern hangar is located, you rm mail transport, sport and training planes com- iz every few minutes Write This Man NOW! He Will . 2 If, re nd ers eontract air transport, air photograp! y i erti g service, operating planes for commercial e p ou pleasure pur ‘Doses to and from all points radiating from Here is Mr. Walliser’s Modern Planes—Famous Aces Teach You y Message ai Maes 4. S. T. fleet includes Ryan Monoplane (Wright-Whirlwind Swallow and Laird-Commercial planes Only modern The time for consider YOURSELF - = censed planes are used and only licensed military and ection with Comme LA ti s RIGHT NC Ww -mail go mechanics and instructors train you Famous Every day is important here is need for ACTION. if s teach you to fly. you are going to make the mostof tod OPPORTUNI- mplete army and navy corps courses adapted to commercial ry. It is part of my mission to help you determine the S Over 25,000 sq. ft. of floor space devoted to ground place you fit best Write me frankly nd fully te ng me ning alone Course covers full 450 hours practical training shout yourself, your educatior ge, experience and de- juired t Department of Commerce. Everything necessary sires I will discuss your qui cati witl ou per- fit you for the big-pay jobs. onall Do it NOW! S. T. is constantly making records—soloing 6 to 11 men per eek placing 10 to 20 and even go men in ener ces h FSCS RSE SSSR CSE S SESE ESSE SSSR ESET E ESE R SEES E KES ES EERSTE Eee ! helping pay tuitior and living expenses rendering » " a ee “ § AVIATION SERVICE AND TRANSPORT, INC. The season is on NOW! Do not delay. Write for full FREI & Dept. P. M. 6, 203 N ‘Wabash Ave., Chicago formation today S § Please send me FREE information about your training Mail 10c for ‘“‘The Airway”, a fascinating book of s facts everyone interested in Aviation should read. : NAME AGE ADDRESS: Dept. P. M. 6 ala “AVIATION SERVICE AND TRANSPORT INC S én 103 N. WABASH AVE., CHICAGO,U.S.A H : . ® la enclosing 10c for rhe Airwa ( ec

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26 POPULAR MECHANICS ADVERTISING SECTION 52500 counse tor 528 Haven't you often wished that you could draw cartox rns, illustrate some idea, sketch some pretty face, « You can do all of these things. One of Ameriva's most famous Cartoonists and illustrators has de veloped a great, simple system for success jin , branches of Commercial Art. This system has revolutionized the entire theory of drawir

means that drawing can be as easy for you = writing — much _ simpler than learning shorthand, bookkeeping or typew I Ve are now placing this original systey for learning Drawing, Art and Cartox consisting of 34 lessons with over 500 illustr within reach of every one. If you will devote a few hours each week to the Course WE ABSOLUTELY GUARANTEE that you will learn to draw ana draw well before you have half finished the ¢ 8 If we fail to make this claim good, we will rx i every cent paid us. By eliminating a larce on force for answering correspondence, expensive cyt. alogs, etc., we are enabled to make a price of $2 4% the cheapest price ever known for a high-grade home study course. Many have sent us letters sim- ilar to that of Rob’t P. Davis of Detroit, who wrot “I can’t see how you ask so little. It is more thar I expected.” Learn to draw. It is a big asset, no matter what field you are in. iant Chest Expander and Progressive Exerciser Be a muscular marvel. Have the muscles of a superman, Become Send NoMoney strong for your health's sake or to astound your friends with extraor- Thi Send No Money If you order the cour dinary feats which only men of it = 18 Just t

once, we will incl . d t order the course and 2 98 drawing outfit, consisting on arrival pay postman . of artist's pencils, pe plus a few cents postage, payment in full = an can hy mt for the entire Course and Drawing Outfit to go to work without any If not entirely satisfied, return within five additional cost daysand we will Refund Money. Address: Cou on LEDERER SCHOOL of DRAWING, Dep!. 8480-0, Chattanooga, Tenn. P Orders from outside the U.S. A. are payable $3.28 cash with order,

giant strength can do. In a few short weeks you will easily do stunts which now seem difficult—then real muscles and strength will be yours—and yours to keep. If you want exer- cise to just keep in good shape you can reduce the strength of the Progres- sive Lxerciser by eliminat- ing as many cables as you wish. If you want great resistance so as to build up big solid muscles then use the full strength. How the Giant Chest Expander and Progressive Exerciser Is Made Fon Giant Chest Expander and Pro- re e Exerciser is made with new five springy rubber so ae to give it long wearing and great resisting qual- ities Do not pay more for an exer- ciser that as forty or less rubber strands to each cable Get the best and most durable The Giant Pro- gressive Exerciser has SO strands of the finest rubber procurable to each

Men and Women Everywhere! Make Big Money! wer 7 FREE BOOK Explains o ate a3 Motion Picture Camera Man, Portrait, News or Commercial Photographer. You can learn at home or in our New York Studios. Spare or full time. N.Y. Institute of Photography, 10 W. 33rd St., N.Y. Dept..49

Free Instructions We do not think it enough to send yo an exerciser worth uble what a lir ited time we

iderful oles a is ; withdrown. Your Guarantee The Giant Chest Expander is sold ae * guarantee that you will say it finest you ever saw or your mony back. 5 Cables or double 10 one for strength The double strength exerc'ser has reeistance of over 200 Ibs. How to Order—Send No Money Sign your name and address to coupon and get your Giant Exerciser present low introductory irn_ mail The price is

d your name and address for free booklet giving interesting Informati and vital facts about Advertising. Find out how we prepare you at home your spare time, for the op unities open in this fascinating business. Fr tical work. Notext books. Old cetabliched school. Successful graduates ever where. Just the plan you have always wanted. Write today. No obligat: PAGE-DAVIS SCHOOL OF ADVERTISING Dept. 135-A, - 3601 Michigan Ave. Chicago, U.S.A

2-YEARS TO ENGINEERING DEGREE! Be a Civil, Electrical, Mechanical Administrator or Chemical EN- GINEER in 96 weeks. No entrance examinations or high sc! diploma required. Low tuition poe expenses. Degrees conferred State authority. Catalog FRE TRI-STATE COLLEGE <= —E-Aii3 Angola, Ind.

cost Don't pay more—order get the most for your money. Use coupon now.

PROGRESSIVE EXERCISER CO., 4006 Langdon Bidg Broadway and Dunne Street, New York d Your 10 cable Progressive. {] Your 5 cable Exerciser Check the Exerciser you wart. and it will be sent you by return mail "ay postman introductory price. plus few cente postage on arrival it is yt sod that if you are not entirely satisfied with your exerciser you may return it within 5 days and get your money back

Please sen

Wonderful, new device, guides your hand; correct your writing infewdays. Big improvement in three hours. No failures. Com- plete outline FREE. Perfect Penmanship Inst. D-34, St. Louls,Mo ony WA OE DAIDRIN

| PTT TTTTORTTIT TTT TEP LT tL ° i 4 Y A ae ee See eee ee ee eT You can learn by our modern and original syst ae + of instruction every part of the Watch Repairing Trade at home as good or better than at a City.. . State. was You can earn money while learning and s If you live panera the United States, send cash with order, | well paying position or Start in business. after pleting our course of instruction. Good w ee ae ee oe ee a ee ee oe a ae oe oe oe oe oe oe oe oe B repairers are always in demand and earn !r $50 to §75 per week. For particulars apply t Wisconsin School of Watch Repairing 166 Mason St., MILWAUKEE, WIS.

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rr first day of Dorothy's house I ty at the shore had been a huge After boating fing all were ready the iat followed said Bill as we left the I": ll set for a good dance.”’ Dorothy, “Dick ean Who'll play the cess, swimming, lor wonh- } um ed at one ‘ hy you play, inother foolis ’ asked don't you? Yes, I'll 6 liy W then, play ‘Far, Far Away’, Mabel, will you help us mit it, but d arty

i note she ar if the 7 awe were to Play I offered Then I Offered Iks can stand it,” - POPULAR MECHANICS ADVERTISING SECTION They gave me the'ha-ha when I offered to play ... but Iwas the life of the party after that dancing in a jiffy Fox-trots and waltzes—with rests few and far betweer After a good round of dancing I decided to give them some real music and began a beautiful Indian love lyric The couples were now seated quietly about the that plaintive melody room, entranced by No sooner had the last soft notes cied away than I was surrounded by my aston ished friends. “How wonderful, Jack! Why haven't you played for us before?” “*How long have you been studyin “Why have you kept it a secret these years when you might have been playir for us?"* Who g wonderful! ave you lessons? He

Clarinet

Ill y for ou.” | erowd instantly urst mut i ( vd instantly b out into I Reveal My Secret nay be able to play football, Then I explained how I had made up 1 1 mind to go in for something besides sport can't tackle a pian i . ~ : . o : ie ‘ | wantec to play to entertain other 0 er hea ou pa » note ane be popula But when I thought of tf) wn u all your life,” cut in great expense and long study and } ‘ required, I hesitated I strode to the piano Phen one day I j iia and acre an ar on 1 to myself: I PICK YOUR & magasine ¢ : prise in store for INSTRUMENT quick and t Piano Hawaiian learn music wit ne new what to Organ Guitar out a teacher They thought | Violin Drums and I was a li ske} Np le cap gs oe —— Trape first, but I sent fo the | Harmonyand booklet and demonstration 4 SSoT T? On t Composition lesson. The moment |

I struck the Flute Sight Singing it I was convinced and sent uppv chords of that Harp Ukulele for the complete course ng fox-trot, “St "Cello Trombone When the lessons a ed Blues Dick. dum- Guitar Cornet 4 oe eee ote ne a | almost dronned Mandolin Saxophone 7 -s — OF Mj pi slp Voice and Speech Culture time each day And w B flash Automatic fun it was No monot 1 picked p the Finger Control nous scales—no tedious ¢ ind w strum- Piano Accordion ercises—no tricky met way like mad Banjo (Plectrum, - o— ms a simple, cor ~ crowd was. all 5-String or Tenor a child pte.’ steam

lam enclosing 10«¢ or The Airw ( e¢

4nd I was playing my favorite numbe al- most from the start " ‘ ‘ " . Anyone can learn to pl t ea I teacher way ight at home I pian f desired, or any othe nstrument that you may choose Almost half a million people have learned to play by this simvle system i than half the time it takes by the old- f oned methods And the cost averages < a few cents a day Send for Free Booklet and Demonstration Lesson )

To prove ow pract U. 8 hool of M cemonstr on lessor let hict may h tt to! to | o be oO} I and de t t ‘ don't delay ‘ or dt ! the attached coi n to« < n \ teve Inet eT 1 } eded « } ‘ ee I Sc! f 761 wich ew Ye (

U. S. School of Music, 76 Brunswick Bid¢ New York City Please send me 4 l free bool M Lesso! n Your Own Home witl duction by Dr. Frank ¢ Demonstration lA nand |] 1 ‘ ‘ I i interested in the wing « ‘ Have ' I ‘ \ (

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' et ae | 166 Mason St., MILWAUKEE, WIS. 28 POPULAR MECHANICS ADVERTISING SECTION RAILWAY POSTAL CLERKS MEN—BOYS MAIL CARRIERS—POSTOFFICE CLERKS 18 Up $1700 to $3300 a Year for Life | ¥8* Coupon Before thepal Lose It PON — No “lay-offs” because of strikes, poor business, etc.—sure pay— rapid advancement. City and country residents stand same chance. FRANKLIN instiTuTe Sept D-177, Rochester, N.Y Sor n sense education usually s ient— i > onnection vernme : Common sense ed 0 sally suficient—no political influence. Rush to me, entirely free of charge, (1) A full description of STEADY WORK. the position checked below with sample coaching: (2 ; book, with list of positions obtainable; (3 rs 2 page Cut coupon and mai it before turning the page. j how to get the position checked ee CjRailway Postal Clerk ($1900 to $2700) (_)General Clerk ($1140 to $1860) | CiPestotace Clerk ($1700 to $2300) {Prohibition Agent ($1860 to $3000) COCity Mail Carrier ($1700 to $2100) (Rural Mail Carrier ($2100 to $3309) | Name Here’s An Easy Way! Begin Right Now! —to bring you a fine cash income! Thousands are making Fireside Without taking any time aw: ay a moking from hundreds ~ : Pisses ace nail o thousands of dollars and doin frome your job. Ple as ant easy their own work besides. We sup m work at home. Decorate beauti- ou with everything yc . 3 ful giftwares the Fireside way t wit WITT * vow ares é R = ide way. Generous Complete Kit WITHOU t can oO —in spare EXTRA COST. It's a cinch! We ne No previous training absolutely guarantee your success, required. No special ability | Fireside Ind needed. No cations study. No F R E E! Fireside Industries, qnemeriaine. With the Three Fill out and mail ; Dept. 66-G, Adrian, Mich. Simple Steps sent you by Mon- coupon at once. Send me your wonderful Free Bool sieur Petit the great artist— Without any ob- | colors. This does not put me under Di t f Fi i ted ligation it brings obligation. irector o ireside Industries, it you wonderful | is just fun! We want men in | | = Ll Fireside Book in { | | | | isin ii ii iin EA RN PROMOTION every community. Be the first! colors. Explains | “®me everything. Fireside Industries, ,Srfes, ‘mich. Act now! Address COLLEGE ‘CREDIT through the success, Sherwin Cody's wonderful new invention * HOME-STU DY COURSES gives you language power in only 15 in vinute ~s’ a day . . fascinating spare-time study at home. No rules to mem- : in 40 different subjects given by Learn correct English this new, easy way. Write . 'Ssasy™smemain COBY SGwoL OF EWOLISH. The Aniversity of Chicago ‘Searle Building, Rochester, N 207 Ellis Hall, University of Chicago, Chicago, I 11. LEARN CARTOONING AT HOME DURING SPARE TIME with the course that has trained HUNDREDS of beginners successfully. The Landon Picture Chart Method al coneiion ORIGINAL drawing by mail makes cartooning easy to learn. This school is a Member of The National Home Study Council. Write today for sample picture chart to TEST YOUR ABILITY and examples of the work of ounen asful students now earning from $50 to $200 and more per week. Enclose 6c in stamps and STATE YOUR AGE. THE LANDON SCHOOL, 2838 National Bidg., Cleveland, Ohio GO TO HIGH SCHOOL AT HOME You can secure a high school education right at home by studying the splendid new courses recently prepared by the Interna- tional Correspondence Schools. ; 4 INTERNATIONAL CORRESPONDENCE SCHOOLS m4 _These courses are equivalent to the courses Without ee ee me full par- given in resident high schools. They have been spe-] ticulars about the course I have checked below— cially arranged for men and women who wish to Hues Preparatory Course Masterly English wins friends, increases chances for — ° ° . Schoo! Commercial Course meet college entrance examinations, to qualify for a High School English business position, or to make up the education they High School Voeational Course missed when forced to leave school too soon. A] Name diploma is awarded at graduation. : Mail Coupon for Free Booklet Address ee 4

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ring

POPULAR MECHANICS ADVERTISING SECTION 29 RADIO sOIN THE © a) ——————— s & i

ASSOCIAT

— ae er, N.Y ription of o<-Dage TS telling 40 to $1860) 60 to $3000) 00 to $3300)

A f $/ 00 aweek : “in Your Spare Jime OINING the Radio Association enables you to Doubled Income in Six Months cash in on Radio now! Follow its success- « . , Z “s I attribute my success entirely » Radio Asso- proven plans and you can earn $3 an hour, in te my success entirely to the Radio Asso Soilan “aaeastll ©. Shaan Clonee a saci ir spare time, from the very first. Over $600,000,- ciation,” writes W. E. Thon, Chicago, who was clerk

. . in a hardware store before joining. We helped him secure the is being spent yearly for sets, supplies, service. managership of a large store at a 220% increased salary. You can get your share of this “In 1922 I was a clerk,” writes K. O. siness and, at the same time, Benzing, McGregor, Ia., “when I enrolled. : ti ‘ e then I have built hundreds of sets— rself for the big-pay oppor- . since t ; a a What a Membership | _ ‘rom 1-tube Regenerative to Superhetero- uties In NadIO, , dynes. lam now operating my own store , d d N Id Can Do for y ou and my income is 200% greater than when oun e on a ew ea I joined the Association. My entire suc- —E ) Oo ear + 1a. “ “ee ; cs 1 neg ae ae = cess is due to the splendid help it gave. \lembers of the Association do ead up ‘ y spa t wait for months before they. a . ‘ i i ¢ . reaas 2—Train you to install, repair Easiest Way Into Radio ike money out of Radio. With- and build all kinds of sets I + Rad I ' $ 0) Ss. ambitious » become a idio ngines t quitting their jobs, our mem- 3—Start you in business with- rd fit eaten if for stae $3,000 A. $10,000 ers are earning $25 to $75 a week out capital, or finance an opportunities in Radio, join the Associa- re time by building “tailored” invention. tion. It gives you a comprehensive, prac- . . . . nd } ] ning , } io sets. serving as ‘“‘radio doc- 4—Train you for the $3,000 to tical and theoretical training and the ) sets, serving as “radio doc $10,000 big-pay radio posi- benefit of our Employment Service. You rs,” selling ready built sets and clone. . earn while you learn. You have the privi- essories, Or following one of 5—Help secure a better position er of buying radio supplies at wholesale. e 2 . ™ ou have he Association behind ri ! the many profit-making plans of at bigger pay for you. pas ipl — oe anc you sn tlie Association. 6—Give you the backing of the

Radio Association. o ‘ Earned $500 in Spare Hours A MEMBERSHIP NEED NOT ACT NOW—if you wish Hundreds earn $3 an hour as COST YOU A SINGLE CENT Special Membership Plan

radio doctors.” Lyle Follick, To a limited nu mbitious men, nsing, Mich., has already made we will give Special Memberships that Ps , . i r nay -nee oc ve cent T cur one writ 500 in spare time. Werner Eichler, Rochester, N. ™ay not—need not—cost bc ee —E . a “ . today. We will send vou details and also our b » “Your s earning $50 a week for spare time. F. J. Geer in ne Radio Industri a alll atin ences ey, Sedalia, Mo., is earning as much in spare to the money-making possibilities of Rad Writ e as he receives from his employer. tm neh. Ore eee e_”6h—~—~*~S™”~C<; ;73SSstéé;‘t”TSDT”C:””t””S”””St es the ambitious man his opportunity to establish | RADIO Asso LATION OF AMERICA | St Many have followed this plan and estab- | Chicane. 11. Dept.pM-6 | ed radio stores. Membership in the Association |] Gentiemen | increased the salaries of many. Scores are now || .Please send me by return mail full details of your. 4 ted with big radio organizations. Others have prosper- | “Your Opportunity in the Radio Industry {| .. | r ago Claude De Grave knew nothing about Radio. | Nan l] is on the staff of a famous radio manufacturer andan |] i member of the Institute of Radio Engineers. He I] Addre his success to joining the Association. His incom ; | 0") more than when he joined. if Cr i | PO AO: LR feel ciindieta lea net iaas tiie ae —— -——-—-—-—-—---- —

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3 diploma is awarded at graduation. } aedte a a a ; | Mail Coupon for Free Booklet ste . | 30 POPULAR MECHANICS ADVERTISING SECTION You can play the CC. HAWAIIAN GUITAR The Plumber ONE! =—— $11.00-$16.00 PER DAY and work peng day, is the Plumber's wage. pros skilled Tyree will tell you that Plumbers have the * Don’t Gon t Envy Just like the Hawaiians / Play all the latest hits just as the Hawaiians do. Be the | | of it. WINTER and SUMMER the Plumber is busy at most popular member of your set, a happy crowd always top wages. No skilled Plumber js ever out of a job—compare . . —, D) 3 around you, everybody enjoying and admiring your | re me7 oe eee playing. Get in on all the good times. Entertain your } We teach you recat with TOOLS (not books) under } aste : a . : eo al Licensed PLU RS fn one of the finest Ded friends or play professionally. We will help you. schools in ‘Amerien emake you a P fensher, aperp Green z tau rv Sercunie— a Work—Blue Print for pian read. Native Hawaiian a LEARN IN 8 to 12 WEEKS pA a expert directs you If you are making less than $60.00 a week you owe it to your- self to a Get FREE c prt em that — = fa __ tures aod words how we teach this trade. Special ra UNIVERSAL PLUMBING SCHOOL NS 2030 Troost Ave. KANSAS CITY, mo. You get expert instruc- tion, directed by a world- famous player and teach- er, Prof. Walter Kolomo- ku. He quickly reveals to you the secrets of this fascinating instrument. | | Complete Conservatory Course | You get 52 complete printed lessons. § Nothing is a Pictures explain | every move. And no matter how tittle you know me pap music vie n you begin, no matter if you ~~ Its Guise and Gire S| Cause aly quire a ave never toucheda musica instrument, you can positively . fearn to play by our plain, easy picture method. You are Y ee can eeguiety cured if you stammer. Send 10 cents coin, : What w do fot others Ge do tor yor or stamps, for page cloth bound book on Stammering and sure to learn! at we can otne can co you. Stuttering. It tells how L cured myself after Stan umering at { ~~ ” . 9 rf - — « i ing anc 51,000 successful students. This record assures your success. Stuttering for 20 years. BENJAMIN N. BOGU Learn at home in spare time 11106 Bogue Building, 1147 N. tl. St. Factonceens ‘ Study in spare time—in absolute privacy— when you like— es long as you like. Even if you don't know one note from another, our method is so simple you begin a piece your first lesson. In half an hour you can play it! Only 4 motions to learn Then you can play any music—popular songs, classical, old- yer. Legally trained ban vin bien soakitens and big s cess in business and public life ke independent. Greater opportunities now than ever before. Big , tions are headed by men with legal tra time melodies, native Hawaiian airs—or real jazz—separately tarn or with accompaniment. You'll never be lonesome aftes ide O0@ to $10, ,000 Annually you learn to play on this beautiful Hawaiian Guitar. eileen anaes tae’ ae. ee a d LaBelle students found among LaSalle Extension University, Dept. 664- L. Chicago The World's Largest Business Training institution when you IVEN .= G $18 to $20 Hawaiian Guitar With Genuine Seal Grain Fabrikoid Cover and Complete Playing Outfit Reliable retailers ask $18 to $20 for a similar instrument and outfit without the fine Fabrikoid Case, which alone is valued at $3.50. Yet you receive this sweet-toned splendidly built Hawaiian Guitar, case and entire playing outfit, in- cluding picks, steel playing bar, tuning pipe, etc., without one | penny of expense, as soon as you enroll. BOOKS SENT FREE! Pay as you play We make it easy for you. Start any time with a small first payment—then pay while learning. It comes to only a few cents per lesson. And bear in mind: Your only investment is the cost of the course —we furnish everything else. Our new illustrated book, “ The Romance and Enchantment of Hawaii— Its Music and Its People.” you will want to keep. You won't layit down until you have read it from cover to — Send for your copy today OTH Tenor Sande, Violin, Tiple. a cSunses Guitar, Uku lele, Banjo Ukulele— well-known instructors FIRST ay CONSERVATORY 9th Floor Woolworth Bldg Dept. 548, New York, N. Y. Erereret as a Correspondence hool Under the Laws of the Seats of New York. Just mail the coupon and we'll set of these remarkable auto b the press. Whether you are a! helper, expert or apprentice, au! driver, if you're interested in kr ga about automobile mechanisms, then by ® means take advantage of this Free 0! Don’t Send a Penny! A better job—in the gigantic au try—BIGGER PAY—a Gases to g business for yourself and get a@ share ©! huge profits, are waiting for any ‘4 even half tries to improve hin Auto a OY ene wor books Can +4 @ new way—without studying or | you fix it? ping. Simoly use the JIFFY INDEX : ook wp the answer .o any aut t These, wonder books tcl Built by eleven of America’s er to take out “play” in di- Mobile engineers, and written | ferential—how to kill the language so you can understand ; a Member of National Home Study gainny fn ficering bow 5 BIG VOLUMES . =i 0 se a NOr—now 9 9 stratior Soe pt Star antiy a par,2000 Mua on engine trouble and then gold-stamped flexible binding the quick expert way to Send This Coupon for Liberal Offer! FIX it. Equal to a com- AMERICAN TECHNICAL SociEn plete trade course at lesg ——_— ee eee ee eee ee than a fourth the cost. Dept. AA-19, tums Ave. & 58th St. cago | FIRST ——— CONSERVATORY OF MUSIC, Inc. SSSR ee ene ith Fl., Woolworth Bidg., Dept. 548, New York, N. Y. ’ AMERICAN TECHNICAL SOCIETY ut Please send oa information about yous 62- B-leesen Hawaiian Guitar Course. I F R E E . oo aM th wo coy ing bo yin y am not obligated to enroll unless | want to TO BOOKS 1 alll cay the foe cate Privilege of con- AUK ; a tere wales ine few enti Cove . " ‘ only, bu choose to, wi return em « Name_ — 7 — sulting Automo- lect. If after 15 days’ use I prefer to keep ¢ Address _ Fneaqere ot send you $F and nay the balance at the rate = = merican ech- month, unt 2 is paid. ease includ nical Society for], ership, your offer above. City __State a one year without Name__ cost if you mail Address —— immedi-f Reference ” : Address as .

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POPULAR MECHANICS ADVERTISING SECTION dl Bea Draftsman 1 Get this Draftsman’s Rule If you are 16 oc alae rhe will copy jac mice ect | Copy This and mail it to me I will send Jack and Get you a Drafts- man's ictee | Drafts- New et Roy Pay-Raising Plan Te EE! Now is the time to learn to be a draftsman and Get Free, “My Copy me and Pay-Raising Plan.” Send for it at once. Let me tell you how some get a Dobe Draftsmen make $250.00 to $750.00 a month. Read this adver- ye tisement clear through. See for yourself how you can make real money as a draftsman. Read how much work there is for them. See anes! mma | py es, oe D af N I ing a so I wi ave some idea what nos pe a 7 see add mba packeS make. r tsmen eeded n = Auto Work Electricity Aviation MotorBusWork Building Work The automobile in- Electricity is the com- Aviation is just in ite in- Motor bus building and There will always be dustry is one of the ing motive force of the fancy. It is bound to ex- motor bus transportation building. No structure eatest in America. world. Draftemen are pand to enormous propor- have become leading can be erected without usandsofdraftse- needed in every depart- tions. Draftemen are es- world industries. Hun- plans drawn by drafts- men needed. I'll mentof thiefascinating sential to it. I'll train you dreds of draftemen en- men. I'll make you an train you for the work. I'll trainyouat quick at home fordraft- gaged in this work. I'l architectural drafte- yet ing position. show you the way. man et bome. “FREE “ws Jack You do not need previous experience. You do not need to be a high school graduate. My practical, home study course gives ” you just the kind of training you need to Raising Pian become successful. Your spare time is all that is necessary. Earn While You Learn Servi You can start earning extra money a few weeks Employ ent ce . = 5 4 After training you I help you to get after beginning my training. I give you special work @ job, without charging you a cent and tell you how to make money. for this service. Employers of drafts- men come to me for men because they Money Back If Not Satisfied — **°" ** me | tin make goos. What could be fairer than that? I don’t ask you to I Train You at Home take any chances. I train you under a positive Money New, Quick, Sure Way Back Agreement. If my training does not satisfy you yy practical working method makes qd it ES SOCIET! Chicago, | anuae t ported after you have finished you get every penny back. every step 2 learning Grafting, = Drafting Toole FREE of all clear as a moving picture. at's why extra expense just as soon as If You Earn I train you so fast to be a draftsman. you become my student. Less Than TITITITILILILILILILI LL a) 1951 Lawrence Ave., Div, A-135 Chicago Here’s the sketch. Send me free rule; also send me free of all cost Engineer Dobe how to earn money while learning and proof of big money paying © y positions. Write Me Today! ACT NOW Before You Put this Magazine Down. GMO .--- nnn nn nnn nnn nnn LAGS Let me send geome boos ‘Successful Draftsmen are needed everywhere. That’s the kind of pro- fession to get into. Get started now. Get into a better posi- Address __._. tion, paying a good straight salary the year around. 1951 Lawrence Avenue FREE RULE COUPON! at home ar A a eek books “‘Succeesful Draftsmanship™ and “‘My Pay-Raising Plan’’ — Draftsmanship’’ and ‘‘My Pay Raising Plan’. Remember Engineer Dobe ji?" MiSs Chicee: Il. ago, til iv Poet Office

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With Violet Ray Vibration Ozone Medical Electricity The Four Greatest Curative Powers Generated by This Great New Invention! Eleo Health Generators at last are ready for youl If you want more health—greater power to en- joy the pleasures and delights aboutyyou, or if more beauty arom desire—wrtte! Ask for the k on these inventions which has just been prepared. It will be sent to you without cost. It tells you how Elco Health Generators aid you in leaving the lethargy and hopelessness of bad health and weakness behind forever. Re-vitalize your- self. Bring back energy. Be wholly alive. Write today! Here’s What Elco Users Say— LO/to (éco Electric Health Generators - “My Eczema gone.” “Cured my stomach Zroubie.” “Ca cm “Now I sleep soundly a ‘ais ight.” Ur anks to Eico fay, strength call vigor are back.” “No more pain. Cold is never bother me no “Chronic Constipation banished.” These great new inventions generate Violet Ray, Vibration, Eleo- Free Trial tricity and Ozone—combined or separate. They operate on the electric light in your home or on their own motive power at less than 50 cents per year. Elco Health Generators are positively the only ———- which can give you in one outfit Electricity, Violet ga and Ozsone—the four greatest curative agents. Bend the coupon below. Get the Free Book NOW! MAIL COUPON for FREE BOOK Do not put this paper down without sending the coupon. Don't goon as you are with pains and with almost no life and energy. You owe it to Ramon to be a better man or woman. You were put here to enjoy life—not just to drag through it. So do not rest another a 4 until you have pet your name on the coupon here t will bring the whole story of these great new inventions. “Do it today—now. ~sseseesesseees | indstrom & Compan y***sssessuseseens 30 West Lake St. Dept. A-135 Chicago Please send me your free book, *‘Health—Power—Beauty” and full information of your 10-day Free Trial Offer. | Pately POPULAR MECHANICS ADVERTISING SECTION } Address 500 TRICKS 10c 4 Be Popular — Learn to Entertain! Amaze and Mystify your friends. Earn money at Clut and Parties. It's easy No skill require d. Our Copy righted book, **Fun-Magic-Mystery”’ tells how Ex; many startling Tricks with Cards, Coins, Matches, reading, ete., you can do without practice. The 1928 Edition, profusely illustrated, containing descriy of over 500 other Mystifying Tricks, Illusions, Puzzles, Books and European Novelties, sent Prepaid on! 10c. | See. Sete Rouges, Saat Douglas, Station A-10, Dallas, Texas. Be aDoctor ¢ tor of Surgical CHIROBOD Diente, prctestionsl field Call for doctors every- , where fake $5000 to $15,000 a year. Course only 2 years B. best known College of Chiropody in Amer- A ica equips you for practice 1Sth year. You are ready to enter with 4 years high school or equivalent. Largest foot clinic in world large faculty physicians, surgeons, chi- ropodists—study in Chicago—you can earn while you learn. Write for catalog No obligation. Dept. 311. ILLINOIS COLLEGE OF CHIROPODY 1327 North Clark Street Chicago & With or without musie. Short Course. Adult by mail. No teacher required. Self-in- for Advanced Pianists. learn 259 st) Blue Harmony, Orienta Trick Endings, Cleve Breaks, Space Fillers, Sax Slurs, Triple Bass, Wicked Har- mony, Blue Obligato, and 247 other Subjects, including | Playing. 133 pages of REAL. Jazz, 25,000 words. A Pos brings our FREE Special! Offer. WatermanPiano School, 1826 W.AdamsSt. Los Angeles,Cal. | BE AN OIL EXPERT! Trained men needed! Geologists, Drillers, Refiners (Chemists Still Men), Oil Salesmen, earn 2 to 10 times more than in other f Write today! FREE Booklet! Petroleum Engineering Uni v« Dept. 226, Fort Wayne, Ind. By Note or Ear. beginners taught struction Course Be successful. Master ich. Win happiness. nformation and special me covers postage. eee ee, Detroit WHY NOT 3rir Serine. Fall wath ring butterfiic sects? I buy hundreds of kinds for collections worth $1 to $7 each. Simple outdoor work wit instructions. pictures, price-list. Send 10 cents (not star my illustrated Prospectus before sending butterflies MR. SIN R, DEALER IN cmaeets, Dept.6. Box 1424. OV TPOSITIONSE "35 10°75 WEEKLY Ry. Mali Clerk ) Steno-Typist Prohibition Inv Summer Postmaster Typist OsMENT INSTRUCTION BUBEAU. ope St. Louis, Mo. Send me To Qualify for positions marked tions, opportunities, etc §

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i eeate wey POPULAR MECHANICS ADVERTISING SECTION 33 REE How to Read Blue Prints FLOOR PI AN New Easy Practical Way Leads Quickly to $4,500 to $12,000 a Year Thousands of Men From All Walks of Life Have Discovered an Altogether New Way to Double and Triple Their In- comes! Surprising, Yes—But True! Almost Over Night They Have Taken Their Choice of 9 Interesting, Big-Pay Jobs—Become Foremen, Superintendents, Estimators, Real Estate Experts—or Are Making Big Money in Business for Themselves. The Same Wonderful Opportunity Is Now Offered You. Don’t Send One Penny. Just Mail the Coupon for Full Set of Valuable Blue-Print Plans, Big Free Book, and Complete Details. IG pay jobs by the score, yes, by the hundreds, study—you are taken by experts right through every step of are waiting for you in the world’s richest indus- try—Building. There is a constant never-ending call for trained men—and still more trained men—men who have practical headwork training ind can read Blue Prints and run jobs. Many men think the only way they ean get this practical “‘headwork”’ train- ing is on the job. But thousands of ( igo Tech. graduates have proved that the ea is all wrong. In fact, a man can spend 5 or ears working with his tools and never get a hance to learn the things he must know, if s ever to get into the big-pay class. Anyhow, 1 long, hard, slow process—on the job. Amazing, New Kind of Training But it’s all different— the new Chicago Tech If You Live in or Near Chicago Visit our day or eve- ning classes which lifferent! ’s » ver 1,000 Builders Ciferent! te quick, get the same train- ing by mail—same t lans, Lessons and Instructors. Mail the coupon for de- tails and keep for reference. you can understand, cal home lessons—no Dept. G-141 118 East 26th Street READ! “Since starting the Builders’ Course I have been raised to Superintendent and my pay raised 100 ' >. F. Blair, Okla “T owe a lot of credit to your course Am now listed as a Brick Contractor and made about $3,800 clear money this summer."’ I Baker, Ohio Builders’ Course way—amazingly easy, certain ttend. You ean Right at home you get real Blue Prints used on actual jobs to examine In language 4-B-C, everything is told you and worked out for you in concise, practi- | textbooks to | CHICAGO TECHNICAL | SCHOOL FOR BUILDERS | CHICAGO, ILL. plain as | Name Address send you absolutely FREE a full set of practical working Blue Prints, also valuable book, ** How lo Read Blue Prints Trial opportunity may not be offered again ee EE SE CHICAGO TECHNICAL SCHOOL FOR BUILDERS, I Dept. G-141, Chicago Technical Bidg., 118 E. 26th St., Chicago, Iilinois. Please send your Free Books and Blue Prints which I under- stand are mine to keep without oblig that no salesman will call on me Occupation Plan Reading, Estimating, and Superintendence so simply and easily it is just like play education to understand every word and absorb every fact You don't need even a grade school Big Pay in 3 Months Consider what this quick, practical Chicago Tech training has done for others. Woodside, in less than three months, rises to foreman, then makes big money in contracting business for himself. In a few months McAvoy goes from bricklayer on the wall to foreman in charge at a big increase in pay. Marchand says * Ten days after completing course my pay was raised 100%.°" Hundreds—yes thousands of others say the same, Chicago Tech. has helped them to bigger jobs or a business of their own. It is ready right now to FREE BOOK help you Blue Print Plans — FREE We want you to see for your- self how easily you can learn to read Blue Prints and do Esti- mating this new quick way how easily you can double and triple your income rest this yourself. Don't send one penny Just mail the coupon. We will Act at once as this Free n It is also understood state

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34 POPULAR MECHANICS ADVERTISING SECTION We Will Train You ina Few Months Day and Night Schools in Chicago Detroit Cleveland Boston Phila.

. Up To $125 a Week as MECHANICAL DENTISTS We teach you to make rub- ber plates, crowns, bridge work, metal base dentures, etc., for dentists. After graduating you are ready for a job or can open your own laboratory. We assist you. Big Demand for Men! Mechanical Dentistry is the laboratory bench work which - the dentist turns over to the laboratory worker. Master this profession and help meet the demand of 64,000 dentists for laboratory work. Every city and every town where dentists are located offers work to the mechanical dentist. We train you in a few months in day or night school for this uncrowded field—no classes—no books—no mechanical ex- perience necessary. Work Your Way Thru School We will help you find a job to meet your expenses while taking our training. And we will help you find satisfactory living quarters when you arrive. Schools located in Chicago, Detroit, Cleveland, Boston, Philadelphia. Day and night schools. INTERESTING FREE BOOK Our illustrated, free book on Mechanical Dentistry will acquaint you with some surprisingly interesting facts. It tells about the thriving profession of Mechanical Dentistry—the way to swift and certain success. And it tells about the progress of many of our graduates—men who have suc- ceeded beyond their expectations, also full details of our liberal offers. Mail the coupon and find out more about this fascinating opportunity. McCarrie School of Mechanical Dentistry 1338 S. Michigan Ave., Dept. 169, Chicago, Ill. McCARRIE SCHOOL OF MECHANICAL DENTISTRY | 1338 S. Michigan Ave., Dept. 169, Chicago Withovt cost or obligation, send me your illustrated book on ' Mechanical Dentistry, and complete information as to my i opportunities in dental laboratory work. Name Address. .

SWB ,vpness..........

Tremendous demand for Practical Trained Electricia and Engineers at Big Salaries. Fascinating w rapid advancement, opportunities unlimited. 12 Weeks Intensive Courses in PRACTICA! ELECTRICITY and POWER PLANT OPERATION covering Wiring, A. C. and D. C. Motors and Ge: erators, Transformers, Armature Winding, Radi Farm Lighting, Power and Light Switchboards Electric Elevators, Electric Refrigeration, Batteries Power Plant Operation, Auieagotive Electricit These courses open to you NO ONE and TWO YEAR COURSES ~ EL ECTRICAL ar MECHANICAL ENGINEERING leading to degre« open in September. Laboratories and shops extensiv« equipped with modern machinery and apparatus. Facult of recognized experts, 27th successful year. Free empk ment bureau. Send for free catalog.

FINLAY ENGINEERING COLLEGE 306 Finlay Bidg. Kansas City, Mo. ACCOUNTING THOUSANDS of ambitious men are earning more money today because they know Accounting. Send for our 80-page book, “How to Learn Accounting,” and the first lesson. Both will be sent free. International Accountants Society, Inc. A Division of the Avexanves Hamitton Instrrute Dept. 51,3411S0.Michigan Ave.,Chicago, Il,

Ag 3 FREE 96-page book, ““‘THE LAW-TRAINED MAN"’, which to learn law in spare time th the Blackstone home -study AC, legal authori s

farn paeme w library, delivered 4 te X- enrollment. orn: grad Moderate tuiti on lows monthly terme. a" rent Write for free book today. BLACKSTONE INSTITUTE, {22,%- ¥'shx Ave. es WANTED!

Ornamental Iron and Bronze Draftsmen. $50.00 to $65 a we: to trained men— up to $500.00 a month to experienced nv We train you at home and help place you when ready. Deman:! greater than supply. Get out of the rut — write today for f information. American Institute of Ornamental tron & Bronze 3065 Hennepin Avenue, Minneapolis, Minn. MEN TO LEARN MOTION PICTURE PROJECTION A BIG-MONEY PROFESSION—$2,000 TO .4,000 We Assist Students te Earn While Learning MOVIE OPERATORS SCHOOL 61 Sproat Street Detroit, Michiga»

The rare, valuable secret b« =< 1 which has astounded the wor Reveals the secrets of hypn fk — & tism, telepathy, personal ma aed netism, mesmerism, clairvoyance, mind read etc This book—called the wonder of the 20" Century—worth $3 but sent Free to you if } order our remarkable course in Practical Hyp! tism—teaches you how to control others- I everybody obey your every wish and desire—econgut habita, enemies, win success in life and Leve, obtain | iti, hem wealth, social position Explains the greatest fo cule $2.45 history of man. The most pprtest complete and easily learned system. Pay Dep!. #

on arrival, including the * pnotic Eye,” greatest aid to beginners EDUCATOR PRESS, FULLER BUILDING, JERSEY CITY, #. J.,

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Dept. G-141 118 East 26th Street CHICAGO, TL. wa ee ean ewe

POPULAR MECHANICS ADVERTISING SECTION 35

“ ee 1 ‘ Wpetaitin,. pita ITE A? < fs nF oe 4 tle aa , Let Air Mail Pilots Teach You to Fly The regular pilots of the U.S. Air Mail are the most capable, loyal, dependable flyers in the world. They KNOW flying. They HAVE to. The very success of the Air Mail depends upon them. These are the men who teach the advanced students at the Robertson Aviation School — the very same pilots who fly the mail between St. Louis and Chicago every day—in every kind of weather—and do it 98% on time. Col. Chas. A. Lindbergh was our Chief Air Mail Pilot and Instructor before he obtained his release to perfect plans for his epochal trans-Atlantic flight. The Robertson School of Aviation is one of the oldest and largest in this country. Going into its tenth year with over 500 graduates. Courses are thorough and com- plete — flying, ground work, lectures, text book study. Airplane factories right here at the field offer exceptional facilities for gaining practical mechanical knowledge and experience,

The combination of all these advantages is something you should consider seriously. They are important, The demand for well trained pilots is growing by leaps and bounds, Get in on the ground floor of this great, new, thrilling industry by getting the right kind of training NOW, from regular Air Mail Pilots. They teach you so well that we require no bond and make no charge for breakage. a

Complete catalog on request. Write today. Y | Robertson Flying Services, Inc. 4 Department P -_ | ; Affiliated with Robertson Aircraft Corporation (Operators St. Louis-Chicago U.S. Air Mail Route) Lambert-St.Louis Flying Field, Anglum, St. Louis Co., Mo. Robertson Aviation School, Dept. P. Lambert-St. Louis Flying Field, Anglum, St. Louis Co., Mo. Please send catalog telling how I can get flying instruction from U.S. Air Mail Pilots. Name. Age Street Address or Rural Route City... State we2e

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36 POPULAR MECHANICS ADVERTISING SECTION * BOOKS SENT FREE! Only fifteen minutes a day with these WON- DER BOOKS will prepare you for a good ae job in — b a Mechanical an Architectura yrafting om simple For Beginners straight lines to important, complex plans, a Written so you can step at atime! Built especially for beginners, understand every for men with only grammar schooling. Draft- word, by 18 famous ing room practice plus engineering made easy Engineers and Ar- and clear! chitects. Deluxe, = flexible binding, . Sig Field—Big Demand—Big Pay! 1750 pages, 1050 Competent Draftemen are urgently needed right now in all blue pri h: ts building and manufacturing lines at $50 to $100 a week. 1€ Di nts, char That's just the beginning—for draftemen have the beat chances and diagrams. Prepares for advancement! Pleasant, fascinating work, easy to learn you for @ good Drafting ‘and do. Learn quick with these booke—send coupon for @ ‘b in mechanical or get FREE, and see for yourself! architectural lines. Sent . for 15 days’ free ue, if A year's Consulting Membership in the you a coupon imme- American Technical Soctety now given diately. Sree to all readers of this famous Cyclo- pedia of Drafting. Many say that's worth more than cost of books. American Technical Society Dept. DA-19, 58th & Drexel Ave., Chicago Modern AmericanHomes FREE ! : American Technical Society’ Dept. DA-19, 58th & Drexel Ave., Chicago Bend for 15 days’ free use 4-volume set of DRAPTING. In return for mailingthis coupon promptly send absolutely FREE “ Modern American Homes,” 112 mm redg exteriors, interiors and plans. I will pay the few cents delivery charges. If I wish I may return books in 15 ove and owe you nothing. But if I prefer to keep them I will send $1.80 after 15 days, then $2.00 a month until $14.80 (special red uced price) is paid Name Address... Bonployed Oy... occ cccccccccvccscsess BEER. onc ccccensdscnetocccecévesenesreasteseseucesseenee ° Re rer a FY | Jo b eS ae CT post nc RAIN ce LENE PARTME of jumpin Re . sane from job t b? pa ouldn't you like to earn $1900 tw $2700 every year and know that your ‘ob issafe? Youcan doit! I'llshow you how to get A set for life with Uncle Sam—the biggest, fairest, squarest employer in the world. You can plan your life, save money get &@ raise every year until you reach the maximum salary, get promo- tions to better jobs, have two weeks vacation every year wit! full Pay, sick leave, pension, eight-hour day and everything you've dreamed about. No worry, no petty bosses. Write for my big illustrated book about all Civil Service Departments of Uncle Sam Don't wait. I’m making a special offer now on my coaching for these jobs. Just say ‘‘send me your Book, Free."" Address Arthur R. Patterson, Civil Service Expert, Patterson School, Dept.x6 Wisner Bldg., Rochester, N. Y. ei To Show My Mysterious Cigarette Lighter to Men Quick, easy profits for you with this amazing invention Lights - Guaranteed for 10 years M organ sold 60 in one day. John- n cleaned up $63 00 in two days Smokers and dealers buy on sight. Noexperience necessary Work full or spare time. Send wind can blow it out! How does $3.00 for dozen lighters or 50¢ it ? for agent’ssample. You make work 100% clear profit. Youcaneasil _, make $40 aday selling to deal- ers. Satisfaction guaranteed or.money back. MASTERLITE MFG. CO., Desk F-23, 110 E. 23rd Street, NEW YORK City Big Money for you as an Automobile Mechanic These four practical books, written by five well known teach- ers of automobile practice, will teach you right in your own home during your leisure time just when you need to know about automobile troubles and repair. They will teach you automobile construction, maintenance and repair as practiced by experts and will help you to earn an expert’s pay. ~- Practical Automobile Library: Four $1.50 In 10 days and $2 monthly for 6 months—only $13.50 in all! Hundreds of question-answeri diagrams—hundreds of clearly- marked illustrations—make the ks plain and readily under- standable. All the explanations and descriptions are clear, simple, direct. Every chapter is packed with definite, step-by-step, how-to- do-it information. Here is your opportunity to enter a big-pay field. Send No Mo FREE TRIAL Mail the Coupon FREE EXAMINATION COUPON McGRAW-HILL BOOK CO., 370 Seventh Ave., New York Send me for 10 days’ free examination the New Practical Automobile Library If satisfactory, I will send you $1.50 in 10 days and $2.00 monthly until the special price of $13.50 is paid. If not wanted, | will return the books at your expense, Signed Address City and State Position Employer P.M. 6-28 You-~and This New Machine | $500 a Month a Tire Repair Shop ,000, ires in America’s test pane oe A A men with emall capital. We furnish everything—$100 and up. Easy pay- sans poy St ons, Write touny for Pros Book to z Haywood Tire Equipment Co. 2330 F Ogden Chicago, Illinois ZIP-ZIP SHOOTER "THOUSANDS of boys are mac happy with this wonderful Zip-Zi; shooter, something every boy want and never gets tired of. Zip-Ziy shooter is scientifically and_ practically made; if you like hunting and out- ’ ; door sports, get a Zip-Zip shooter with plenty of pep and Soren, If your dealer happens not to have them, order from us. Zip-Zip shooter 85c or three for $1.00; coin or mone . AUTOMATIC RUBBER CO, Dept. 8.8, COLUMBIA, S.C Al he N._ Send now for free illustrated book. ART STUDIOSB Ine. Dept. MP. 2926 Broadway, Chicago, Il BY OUR PROFIT-SHARING PLAN OUR GRADUATES SUCCEED One of our Tows students started in s very emall way—now & ing over $30.000 a year. Another in Wisconsin, over $10,000 th | first year. Day or night classes. Call or write for FREE BOOK | | Chicago School of Watchmaking, Dept. 4101, 549 W. Randolph St., CHICAS®

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, t you um pi ug I 100 to our job y to get 1Uarest ey, Zet promo- ith full you've my big le Sam. ing for irthur ept.s6, —____

nace ~ Zit -Zin Cally

City... State were POPULAR MECHANICS ADVERTISING SECTION 37 12 SHORT WEEKS — THEN A BIG PAY JOB Get in the BIG PAY field. Earn from $50 to $125 a week. No layoffs—No strikes. Big demand for real HE MEN. MYSTERIOUS — FASCINATING — ELECTRICITY Learn all about it—the practical way. No BOOKS—No PRINTED LESSONS. Work with REAL TOOLS on REAL EQUIPMENT. Work on real motors, generators, substations, batteries, com- plete telephone and telegraph systems, house wiring EVERYTHING. KNOW ELECTRICITY. L This Is Not a Correspondence Course. All Practical Work |

: in These Men Learned Ho “SS <= —— 1am making $00 0 wee ek and more ~)4- a R.F.D . — ; nstows Board and “T ar . Bisowle und have be rking as Dynar snd Black et Forer My weeh lary averages from $ Railroad Fare wT took - our ach a ‘ alter [came home a, peappediright he & ened av i since .. i Seenmeme Fervor) | Included in This Himdingbare 1 Int ion FREE ro . Training u ormat on . REMARKABLE Write today for, BIG gow Ft N F« Oo regar « y remarkable tu fier MAIL COUPON NOW—T¢ A I % -_ "T otek sted ie T U ! Tl 0 N - oe ENERO ee i system of training OFFER J. H. McSweeny, Pres., I ning that makes McSweeny Electrical Schools,

® trical me Dept. 51-HG, Cincinnati, O., or Cleveland, O. s Dear Mac 4 Without obligating m¢ RUSH your BIG FREI BOOK, which gives me FULL TNFORMATION on REMARK- ABLE TUITION OFFER.

(SSCS STEER SEER ESSE eeee

Name Address ELECTRICAL ned ein CINCINNATI, OHIO CLEVELAND, O000 Lccccesccsocscsccsccccccoccocsnsncceen eecccase Get this great work for your own use Learn Watchwork, Jewelrywork Write for FREE Booklet and a Leib Say PM2 and Engraving m See woes penne = a good salary, and your services THE ENCYCLOPADIA BRIT ANNICA, INC, | always in demand. Address Horological, Dept. P, Bradley 342 Madison Ave., New York City Institute, PEORIA, ILLINOIS, for our latest catalog. Travel on ‘‘Uncle Sam’s”’ Payroll $158 TO $225 MONTH Mail Coupon Before You Lose It | acti hoa ER A RNRROR SS Sa TO gg aaa ORaE NS Tae eae meena i FRANKLIN INSTITUTE, Dept. D-174, Rochester, N. Y. a No connection with U. 8S. Government) @ Sirs: Rush to me, without charge, (1) Full parti cul: urs, telling how to # become au Railway Postal Clerk; (2) send copy of 32-page book, ‘‘How ¢ to Get U. 8. Government Jobs,” with list of many positions obtainable ’ and sample coaching

“On the Fast Mail in the 4 Hudson River Valley”

* J * * * BH AVANCE, ccccccccces scceessseeees se eeeesesesesesseseseseseessese++eeees * a 2 2 - Steady Work — Wo Layoffs — Paid Vacatiens — Common Education Sufficient Address...... ine - Perrrereerreee

Show Card Lettering 1 bales is the very course you need if you want to get a good paying position as a Show C ard Eatherer or Sign Letterer, or have a business of your own. This course is complete and practical and es —, art anged to meet the ne¢ as of = student who studies at home. It was written by E. L. Koller, Principal of the Int , Set of Art, member of

the American Federation of Arts, “oad The National Society of Craftsmen A H. L. Wood, a clerk, made more than $700 “on Ceca the side’’ before he had completed this course SCHOOL Harry Lord writes that he has more than OF ART doubled his salary. William Whitman Division of the earning three times as much as he a International Correspondence Schools did before enrolling with the y” Dept. 5537-F, Seranton, Penna. International School of Art. ra Without cost or obligation, please send me . “Ginf, Mail C full details of your home-study course ir lore Cn Learn f a (SHOW CARD LETTERING ] , ° sel TRATING CARTOONING 5 at = Booklet ~~ oat = Home a“ 7 o sf Address ——F mm mm ee ee ee

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_*eaecees . One of our Tows students started in a very emall the ee : OO ES pete ae ona cater se er Fae Boor Bmployer PM. 628 & | [Chicago School of Watchmaking, Dept. 4101, 549 W. Randolph St_. CHICAS? 38 POPULAR MECHANICS ADVERTISING SECTION Here Is “Where to Find “What <You “Want EALIZING the difficulty one frequently encounters in locating information that may be sorely needed in pursuit of a line of work or study, we have adopted a plan that we believe will be of real service to our readers. To a greater extent than ever before knowledge pertaining to practically every kind of human endeavor is made available through the medium of books. Each month, therefore, we will vive descriptions of new and outstanding books that we think will be of the greatest interest. ings. thing that will be helpful. We suggest that you send for our catalog of over 5000 books listed alphabetically under 2000 subject head- If the subject you are interested in is not covered, write us about it, and we will try to find some- New and Outstanding Rooks Dyke’s Aircraft Engine Instructor Just out. A big book on a big subject. Many firms, magazines, government departments, engine manufacturers and individuals all cooperated with A. i.. Dyke, eminent gasoline engine expert, to make possible this up-to-date book dealing exclusively with modern air- craft engines. The greatest need of the industry is for men who have a working knowledge of these engines. This work is the most authoritative on the subject. 400 Pages. 400 Illus. Flexible. Price $5.00 Everybody’s Aviation Guide Aviation for everybody is coming—rapidly. This new book by Major V. W. Page avoids technical detail and answers the demand for a simplified book to provide young people, beginners, students and all others with information of general interest such as the control systems of all types of land and sea flying machines, ete. 256 Pages. 140 Illustrations. Cloth. Price $2.00 SKYWARD—By Commander Richard E. Byrd, U. S. Navy In his new book this intrepid explorer who was the first to circle the North Pole by air and who plans next to conquer the Antarctic “the globe's last great geographical challenge,’’ projects his flying aspira- tions into the future. Fascinatingly he deals with the tomorrow of the airplane. Revealing to the mat re mind and inspiring to the youth. 369 Pages. Illustrated. Cloth. Price $3.50 Fur-Farming for Profit A new book by F. G. Ashbrook, chief of Division of Fur Resources of U. 8. Dept. of Agriculture. Here is a complete book dealing with every aspect of practical fur farming by a man whose first- hand knowledge of every detail of production causes his advice to be sought by fur farmers everywhere. This book is for everyone connected with or interested in any branch of the fur industry. $326 Pages. 128 Illus. Cloth. Price $4.00 Armature Winding and Motor Repair By D. H. Braymer. Practical information and data covering wind- ing and re-connecting procedure for direct and alternating current machines compiled for electrical men responsible for the operation and repair of motors and generators in industrial plants and for repairmen and armature winders in electrical repair shops. The book also covers motor troubles and motor repair. 600 Pages. Jllustrated. Price $3.00 The Welding Encyclopedia New 5th Edition. By Mackenzie and Card. New operations in the welding industry are at once incorporated in this book. Exten- sive and valuable revisions have been made in this edition It represents the highest authority in this industry and can be relied upon for authentic information, pertaining to all kinds of autogenous welding. 480 Pages. Profusely Illustrated. Flexible. Price $5.00 Ship Model Making, Vol. 2 The making of a model of the American Clipper Ship “ Sovereign of the Seas," Donald McKay's most beautiful vessel is described in this new book by Capt. E. A. McCann. Two methods are given so that either a simplified model that eliminates much work may be made or a complete scale model for anyone wishing it. Full descrip- tions, illustrations, plans. Cloth. Price $2.50 Handbook of Window Display By W. N. Taft. An exhaustive discussion of the fundartental principles of modern window display work, together with hundreds of examples of these principles as applied in actual practice ins c- cessful retail and department stores all over the country. Complete data on every phase of window display work are given, from a pre- liminary consideration of the field to the design and execution of a —_ display. 428 Pages. 207 Illus. Flexible. Price .00 Any of the above books sent postpaid u and you prefer to have books sent C. O Practical Landscape Gardening By R. B. Cridland. This book is for the owner of a modest home It tells how to plan and plant from a 20 foot plot up. Gives detailed sketches, planting plans and working plans showing how to con- struct walks, drives, pergolas, terraces, pools, fountains, garden Seats and rustic houses. Also covers home ground surroundings lawn making, gutters, catch basins, roadways, etc Illustrated. Cloth. Price $2.50 Are You Ready for the Boating Season? New, revised edition of our Boat Book covers the building of several different types of boats for the outboard motor as well as rowboats canoes, portable folding, motor, house and sail boats, punts, trailers, catamarans, speed boats and boat houses. Paintin and calking hulls and other valuable information. Pric 50 cents A Homemade Refrigerating Machine At comparatively small cost the home owner can construct a house- ho!d refrigerating machine that will operate with complete success and give much better service than ice. The instructions for making this machine appear in our book entitled ‘‘ Home Mechanics’ which also contains dozens of other valuable household helps. 88 Pages dilus. Paper. Price 60 cents. Recreations in Mathematics By H. FE. Licks. Mathematics an entertainment.

Its puzzles afford many interesting and pleasant hours for all who like figures. In- triguing questions, simple, complex, logical and fanciful, each representing some ee eee Your ingenuity wil! be stimulated, your appetite whetted, your curiosity teased by any of the puzzles or riddles contained in this book. 155 Pages. Cloth dlustrated. Price $1.50 Ropp’s Calculator This famous book of which over two million copies have been sold has been issued by the publisher in new and attractive styles of bindings. Shows the answer as quickly as a watch shows the time to all problems in office, store, shop, bank, farm or factory. Should carried in the pocket or kept handy on the desk for reference Desk size, flerible, $2.00. Pocket size, art leather, $1.00. Pocket size, cloth, 50 cents Blue Print Reading By Fairfield, Kenison and Waite. Here is a valuable book of in- struction in blueprint reading through the analysis of typical plates with reference to mechanical drawing conventions and methods. 2:6 Pages. 206 Ilius. Flexible. Price $2.00 The Complete Practical Machinist By J. Rose. New, revised edition of one of the best-known books on machine-shop work. Written for the practical workman in the language of the workshop. Full, practical instructions on the use of all kinds of metal-working tools, both hand and machine, and tells how the work should be properly done. 647 Pages 4 illus. Cloth. Price $3.00 How to Draw Cartoons By Briggs. Let the world's most successful cartoonist tell you. He takes up in logical sequence every step in cartoon work and eusses it in detail. Briggs answers every question a beginner might ask. Even the professionals will learn from his book. Every branch of cartoon work, the strip, comic supplement, editorial cartoon and the like, is fully described. Zlaborately illustrated Boards. Price $3.00 Small Motors, Transformers and Electro- magnets By Stoller, Austin and Seeger. An excellent discussion on desicn Se of small motors, ete. 311 Pages. Cloth. Prict 24 n receipt of price. If in the U.S. . D. we will do so, charging in addition to the price, a small fee to defray the extra expense involved for the service. PorpuLaR MEcHANIcS Press—Room S6—200 E. ONTARIO STREET, CHICAGO

q é [ ‘ie

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iia I at Booklet »~ LI TLLUSIT RATING JV iVvurinw x Name at Home a“ racecars POPULAR MECHANICS ADVERTISING SECTION 39 ‘How can get into Aviation?” nt eeded Ice to kind ] > | ead this Answer from t u uCCERs va king whieh Page Aviation is waiting for no one! Too many millions of capital are already invested—the as deal demand for air service of every kind is nsvending too tnt Aviation demands men who “ _ KNOW. Men who can DO. Men who can step into the real jobs and command the real ens salaries Plane production today is ter mes what it was a year ag And a vear from , e now it will be twenty times what it is today! Landing fields, municipal airports, plane and al t equipment factories, air mail and passenger lines, service and sales organizations—all are ‘ leaping ahead in the fastest, most amazing development that any industry has ever known. In such racing, feverish activity, where is there any room for a man who has nothing to offer? An empty pocketbook is no drawback—but Aviation has no place, no patience, no time for » acti o empty hands or empty heads! Aviation is taking off for the greatest non-stop flight in les of Walter Hinton history—and the men who will go along and climb to the top are the men with a foundation » time of FACTS under them. Id The man who is ready to help rence YOU get into Aviation is the You Don’t Have to Fly; Get Your Ground Work NOW | Aap te mee he hang 4° Different Jobs On Right at Home—Hinton € 0 oO anc Walter Hinton was pilot of the the Ground PAY BIG Too! Is Ready to Train You : mous NC-4, first plane to fly To succeed in Aviation—make BIG MONEY YOU can train at home in spare time for the e Atlantic he piloted the first you need not necessarily be a pilot There best paid jobs in the : Jinton’s ine from North to South must be many thousands of pilots, certainly proved course start " beginning erica; he was first to fly to But for every plane that flies, there's an im- trains you fast. You get ine Satin aha e headwaters of the Amazon; mediate need for trained men in more than ¢.nctr oteine tants Seiad - examin vas the hero of the runaway forty different important jobs on the ground 4 re +a sch thd wits, Paton pas nee balloon that was swept Construction, motor and instrument experts - . a flight, navigation, commercial ooks fway tothe North Pole. But airport managers, service foremen, salesme! Aviat 1 tbe that erery Man must have to 1 ‘ addition to being an explorer, ali make real money. Some of them even inte ently and profitably fill AN Y job in the € use meer and aviator, Hinton also bigger pay than pilots earn. But every last In r With this Instituce’s trainir mn d A. lg nay ong te Oy others the one of them must have the FACTS. ‘Today's have yur foundation, your start, for real ac r was « crack flying instr problem—YOUR problem—is to LEARN con plishm ent Serious-minded air-n ad ‘avy. Today—with a « Aviation quwich And right there is where men are reading and acting on the Free Book agree is the me a ieeae lete and Walter Hinton is achieving the biggest success shown below. I want YOU to havea copy too! whet So agg eg! La of his career. Send the coupon NOW le Aviation ¥ 1k below P- CUE ne oat ‘FREE Berake thie (Signed) Walter Hinton, President nd forthis book—NOW! = a : Aviation Institute of U. S. A. ‘orial 4 ; f ? 1115 Connecticut Ave., Washington, D. C. - I > 2 Walter Hinton, Pres. 1-F , Tells YOU How to Start Aviation Institute of U.S. A. 115 Connecticut Ave., Washington, D. C. Please send me at once your FREE Bool Rich Rewards Aviation’’ showing w / can get into this tremendous field Name Street > mm oo 18) City State SE cs

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40 POPULAR MECHANICS ADVERTISING SECTION

OT WARM AIR HOT WATER STEAM OR VAPOR HEATING PLANTS

Free Book Shows AMAZING EASY WAY to Quit Tobacco Are you nervous? Do you suffer from heart-burn, head aches,

a — ay sleeplessness, inability to work at full capacity, etc? _ If you do, é I or eve ry kind of he ating 8) stem you may not be aware that tobacco is the cause. No ae aa for every size home or building, the —— - —- Fame <a — ape its harmful e —_ ° effects 1e Keeley Institute has published a valuable and LACO is the PROVED oil burner. helpful book that every tobacco user should road—i it tel lis bh ~ i. 3 J 5 ing to quit the tobacco habit easily and quickly—at home nd When the LACO oil burner is in- without a bit of trouble. Tells how The Keeley me sthod quic! kly . . I ishes all z f toba stalled in your present h ating plant »sanishes all craving for cco. your worries over the heating problem Send for Your Copy Today have ended. You will then have The Keeley Institute has geen positively that anyone ca automatic, quiet, clean, economical heat. No -_ tobacco by their simple, easy method. They have hel. t aie q as 3 n ° 10usands restore themselves to glorious new vitality and more trips to the basement to poke up an mm health when tobacco had almost ruined them and robbed them different fire—no more shoveling of coal or of success. The method is simple and absolutely harm|: carrying out ashes. At the touch of a finger to Don t try to banish unaided the firm hold sabecee hes upor tha wes ge wee you. rite toc lay for your copy of this valuable book. Ba: ish the thermostatic control, you can have just tobacco forever! Enjoy the mental vigor and hearty appetit the temperature y ou want all over the house the sound, sweet sleep, and the sheer joy of health that freedom no matter how cold it is outdoors. from tobacco will give you. Write Now—no obligation. . ‘4 aly , 7 995 (ts - . At the extremely low price of $225.00 tank The Keeley Institute and installation extra) the proved LACO is made to heat homes of from five to seven Dept. A-910 DWIGHT, ILLINOIS

rooms better and more economically. Six other sizes are manufactured to meet every heating requirement. Each size is the lowest in price for its heating DE ALERS! capacity. It’s as simple s as the ordinary kero- Ask About sene lamp; safe as a gas range. Thousands of the LACO LACO oil burners have Sales been installed. Write for details, proof and Opportunity prices of the remark- . * BUCHSTEIN’S FIBRE LIMB -t AY coal, neat, light. Fasy

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a PERFECT t LOOKING NOSE ours Trados Model Ni No. 1 laiveda now ill-shaped quickly, painlessly, permanently and comfortably at | (excepting cases caused by improper bone structur« is a safe aad guaranteed patent device of precise a ment that will actually give you a perfect looking Over 90,000 satisfied users. For years recommends physicians. 16 years of experience in manufacturing \o«+ Shapers is at your service. Model 25 Junior for ai dren Write for testimonials and free booklet, which tel! how to obtain a perfect looking nose. M. TRILETY, Pioneer Noseshaping Specialist Dept. 3070 Binghamton, N. ¥ able LACO.

LACO GAS BURNER CO. 307 Union Street Griswold, lowa

« When all else fails, end your suffering with the Heefner Arch Support No Metal Fully patented. Itre-adjusts the entire foot. Write for free book and statements from doctors and users. 664 M. E. Taylor Bldg. —_ Louisville, Ky. Write for Details and Prices PC oe oe ee ee eee me em Laco Gas Burner Co., 307 Union St., | Griswold, lowa. | Gentlemen: I want to know more about LACO for my home of I I | * rooms | ] Check square if interested in LACO agency | Skin T roubles | | | 4

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Cleared Up—Often in 24 Hours To prove you can be rid of Pimples, Blackhea: Acne Eruptions on the face or body, Barbers’ Itech, Ecze Enlarged Pores, Oily or Shiny Skin, simply send me y name and address today. CLEAR-TONE since 1910 « 500,000 users—simply magical in prompt results. Use toilet water. You can repay the favor by telling y.'' friends; if not, the lows is mine WRITE TODA E. S. GIVENS, 528 Chemical Bldg, Kansas City, Mo. Name.. Address | Postoffice State Se mm eee a ea ia eC

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-CO iches, ”u do, an or rmful > and how and ekly elped them nless nye inish Cit State ee a i eT irene POPULAR MECHANICS ADVERTISING SECTION 41 rll Pay Your Railroad Fare to Chicago Without Extra Cost $15,000 a year for GREER GRADUATES ELECTRICITY, AUTOS, AVIATION now pay GREER trained men are NEEDED. I HAVE hundreds of trained men up to $200 A WEEK. MADE hundreds of $10,000 A YEAR MEN. Here are THE 3 WORLD'S GREATEST BUSI- 90.000 in the last 26 years have come to GREER. NESSES. BILLIONS—not millions, but BIL-~- THOUSANDS MORE in the future will likely LIONS of dollars are spent t in them every year. come here. BE ONE OF THEM, Send coupon 5 ONE OF THESE THREE, HERE and to me for openings. Ow MEN WANTED I will beip you get a position while —— = after gradust ion. Never before such un rtunities. GET MY FREE BOOK Wil a 4 EARN ABOUT Tne a £ AY © pty 0" 1 A ead TWORLD’s BU SINESS. That's whe GREER College selected these Fields and ONLY THESE. tary Converter, used by students for testing Learn to Boss the Job ates, ELECTRICITY | Learn in Only 3 Months in GREAT GREER SHOPS ON LARGE LIVE EQUIPMENT » ig NOT A CORRESPONDENCE il of HARD THEORY—NO E. You can start ar " 4 Itis PRACTICAL EASY. QUICK, PRACTICAL SHOPS TRAIN: whee ~ \TING Ly You learn on Great, running, DOING. You learn to fy by mendous GREER SHOPS. AUTO fying. BIG GRsi BUS i= ~ world. Pg Vie FAS TEST GROWIN an a nfanc: 47 ths mete any alluring business toda: ~—_ 4 You Get Real Help to s aB lic op Dollar Industry one of these 3 wonderful professions dodey, BIG JOBS 2 en ate needed by ecores, for positions up to $: ad up. Find out now, about my great Shops TWELVE PEOPLE are in my Big ing. PLOYMENT DEPARTMENT getting be for Greer You get their help ASOFTEN AS you NEED iT, both BEF FORE and AFTER uation. a Easiest of Ways to Gm Become Expert Get My FREE BOOK PAY YOUR FARE HERE FREE of extra cost, \toaJOB WHILE LEARNING, ‘Then I not NOW rt hel LIne | I Young and Old, Educsted « nm PR ! let mene hold you ed and Experienced have found ¢ G RE ER SHOPS back. Get Free Book. SY, FAS ind out Nol y, how I PA HERE, let YOU DAYS or OUR FARE Coupon below brings details. ATTEND EITHER BVENINGS and help yeu find Not Corre- DAY or EVENING WORK to s endenc PAY SOUR Sar See eee ey z. Then when rea id Co © JOB. a : £4 ~ real BIG PAY urse . how 1 get you rea dy — N ok yers WANT YOU, and GLADLY pay you what you are wort Here at GREER SHOPS ou learn on BIG ULL SIZE Machinery, like you will work on out on the Big Pay Job. Y to" personal supervision. O Guess work—NO books — = 90,000 Students “26 Years Teementeus Success +) eee Above is the important EH history of GREER COL- LEGE. Note the steady 26-years growth, thru genuine SERVICE, from the tiny Shops on the left to the tre- mendous Building on the right, filled with GREAT TRAINING Equipment. These GREER COLLEGE I can make you a most unusual short Get My Big Offer Now! Would an offer of £100 a week be OPPORTUNITY ti off cli m NOW 2024 Se. Wabash Ave. ‘™° find ah "ae os personally CHICAGO, ILL. _Enwin GReEn, President Address moves to always greater quarters mean GROWTH—PROGRESS and SERV- ICE. What is it you like—ELEC- TRICITY—AUTOS—or d nating AVIATION? GREER will train you in EITHER, as YOU SHOULD BE TRAINED, Ave Chicago, Hiinets ee or DISAPPOINTMENT tor you? If you govts Se r 300k i Electricity—Autos— HOLD the JOB it would truly be OPPORTU anne oan “Setalin of Brock * 7 ITY. If you can't hold the $100 a week offer, vithew obligation to me Aviation Bonne Mme Be ready. Don't invite dis- CT] tlec- [_] Avia- intment. Learn about GREER Autos tricity | tion Dept. 601 8 OPS. Right now if you act quick,

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} Postothice to eee ces eres eee ee ee es ee ee es ee > oe ee ee oe oe ee state ' 42 PAIN and DISEASE Quickly Conquered by VIOLET RAY Let us tell you how thousands of menand women suffering from rheumatism, neuritis, paralysis, nervousness, skin diseases, headaches, constipa- tion, sprains, prostate trouble, goitre and many otherailments, even hay fever and asthma, have found quick relief—new health and vitality with this marvelous, scientific invention. Pains vanish almost instantly. Days “Yioletta. 2: For Health—Beauty—Vigor Trial Endorsed and used by hospitals, sanitariums and physicians. Every home can now have one. Saves hours, days, months of suffering. No medicine. Painless, pleasant treatment. Only the violet ray can penetrate toevery nerve affected. Simple, safe, painless—anyone can use VIOLETTA. Why suffer pain and poor health when you can try VIOLETTA 10 days FREE. This Book FREE Tells all about violet rays—how this marvelous discovery by Nikola Tesla, the electrical wizard, now brings this mysterious curative power to all. Con- tains many astounding testimonials from our thousands of satisfied users, Send forthe facts and our liberal trial offer today. Mail the coupon now. VI-REX CO., Dept. 631 2304 Warren Avenue. Chicago Ten Chicago VLREX CO.,2304 Warren Ave., Dept. 631 Please send me your free book on Violet Rays and details of your 10 days’ free trial offer. Address City | | | | | ae | | | |__Ailment aaa ane VV u toilet water. friends; if not, the loss is mine. E. S. GIVENS, 528 Chemical Bldg., Kansas City, Mo. POPULAR MECHANICS ADVERTISING SECTION sers—simply magical in prompt results. Use You can repay the favor by telling ) WRITE TODA hae oe Toy-\cre) TECHNICAL ooo 5 Sich Intensely practical training. 2 year Di- ploma; 3 year B. §S. Degree; special 3 and4 months’ short courses. Courses adapted to your needs. No time wasted. Expert in- structors. Graduates in constant demand. Opportunities for self-support while studying. Day and evening classes. Athletics. Enter any time Low tuition—easyterms. Desirable board- ing accommodations. Write today for your copy of 80-page illustrated Blue Book, mailed free. Chicago Technical College Dept. G-76, 118 East 26th Street, Chicago $20 Musical pacitaasent Yes, we will give you without extra cost a $20.00 quality Vielia, Tenor Banjo, Hawaiian Guitar, Banjo, Banjo-Guitar, Cornet, Guitar, Mandolin or Banjo-Mandolin. learn to play by note. We teach men, women, boys and girls by mail, Amazing new, simplified method A few cents a day pays for Lessons. Instrument and first lesson sent on FREE TRIAL. Over 500,000 successful pupils. Write today. CHICAGO CORRESPONDENCE SCHOOL OF MUSIC, INC. 1632 North Halsted Street, Dept. 703, Chicago, Hlinois. Write today for this new book. It tells you how \ alaw training will shorten your road to suc- cess. It also carries a vital and inspiring mes- sage to every ambitious man. Find out about the opportunities that await the law trained man. Find out how you can learn law rightin your.own horge. No obligations. The book Is absolutely Frar. Write Today—Po Ryne low tuition fee is in force, American Correspondence School of Law 3601 Michigan Ave. Dept. 135.a Chicago, li, LEARN MECHANICAL DENTISTRY making crowns, plates, bridges, etc. for dentists Unusual demand now and always will be—a! man necessity. Steady, dignified Profe Trade. Three to six months training. Ea learned by actual practice. R.R. Faretonear- est school included, Part time positions t help pay expenses while training 7 Ask for Catalog No. 2. “i : BODEE DENTAL INSTITUTE wl New York Philadelphia Brooklyn 1755 Broadway 1305 North Broad Street 85 Court Street “BECOME A LIGHT aT") TRICK CARTOO Send $1.00 for Laugh Producing Program of 23 Trick Draw ings with Instructions, Catalog of Chalk Talk Supplies Free BALDA ART SERVICE, Dept. 1, Oshkosh, Wis Great Athletic Book [0c Be strong and athletic. Learn wrest- ling, self defense, jiu-jitsu. Let - Farmer Burns, Mer. Frank Gotch, World's Champion, teach you. Great opportunity for young men, Makes you strong, healthy and skillful. Send 10c for 32-page book and tricks by Burns and Gotch. Only 6 few at this price. Write today, giving your age. Farmer Rurns School of Wrestling, A337 Rames Bidg., Omaha showing great holds Neb.

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; CHICAGO, ILL. ERwin GREER, Presisent Address lo. POPULAR MECHANICS ADVERTISING SECTION 43 Talay lon Siro ea = @eaklings Stand Aside. Be defiant, courageous, MANLY! You won't be regarded as a real man if you are a slouching, nervous, fidgeting grouch— slinking along, afraid of your shadow, timid in company; sallow-complexioned, pimply- faced—with shifting, cowardly eyes; round-shouldered, with unsteady step; a cold, clammy grip—lacking pep, punch or personality—you simply won't get anywhere. Fellows of this type are not wanted. If you are a weakling, sickly, nervous and always pessimistic—you will feel your inferiority wherever you go. Men will shun you. Women will not be attracted to you. Even dogs will bark at you! It is the penalty you pay for weakness!—but you won't have to pay this price if you will face the facts and make up your mind you are going to go to the mat with ill-health and fight to a finish. It’s up to you—to you alone. You can overcome weakness. You Can Be Strong and Healthy Like thousands of those who have come to me in a pitiable state of physical bankruptcy you can be restored through STRONGFORTISM, the basic science of health and strength. You can be raised from the depths of despair and despondency to the heights of glorious manhood. You can be strong, vigorous, happy and successful if you but give Nature a chance to work through my proven system. STRONGFORTISM Creates New Energy and Strength f S "occnet Through STRONGFORTISM men all over the world have been rejuvenated and re- 10te. We stored to health and strength after they have suffered untold mental and physical rm horrors as the inevitable result of excesses, fast living, and abuse of their physical power. STRONGFORTISM has a record unparalleled—there is no other system, or method, or Ic, INC course that compares with it in restoring impaired human beings to health and strength. STRONGFORTISM begins at the source to create new energy and strength by utilizing Nature's forces scientifically. It builds up the internal muscular system first and thus gets rid of constipation, dyspepsia, indigestion, heart ailments, bad blood, catarrhal troubles, rheumatism and other afflictions, increasing your energy and ' stamina. External muscular development follows quickly and you become a new man ~o inside and out—a fellow to be reckoned with and envied wherever you go nes= out -_ NO APPARATUS—NO DRUGS own feo Strongfort’s Course does not depend upon artificial means or stimulants—no dope nor drugs, Nature does the work—all you do is give Nature a chance. Only a little of your time, in the } privacy of your home, is all that is required. You will be surprised at how easy It all is, how Mu, astonishing the results, how speedily you will feel the effects of the new life animating your - eames whole body. TRY I Want to Send You MY FREE BOOK dentists ea This book of many pages and dozens of pictures tells of my wonderful experience—how fe STRONGFORT I became the outstanding se SSCS S CESSES eee eeeeeee ba Builder of Men athlete of the world, per- tonear forming feats others darec . x . ition Compare Lionel Strongfort’s not attempt: how I turned Clip and Send this Coupon physique, faithfully ictured the knowledge gainec pare with that of aay of the through Sat’ pe = an FREE CONSULTATION —_ undreds ublished of other body to the bene 0 " . . UTE athletes and strong men. Com- others, and then how ABSOLUTELY CONFIDENTIAL boklyn ‘ are the lines. See the muscles. STRONGFORTISM was Mr. Lionel Stron@gfort, Strongfort Institute, Dept. 47>, — ote the fact that Strongfort is evolved. It tells what I Newark, N. J.— Please send me absolutely free my copy of not crouching, nor pressing, nor have done for others, what your book, “‘PROMOTION AND CONSERVATION OF expanding—he stands up I cando for you. It doesn't HEALTH, STRENGTH AND MENTAL ENERGY." I straight, naturally, normally— mince words. It tells plain have marked (X) before subjects in which I am most interested. the finest and most perfect truths. Catarr Overweight ..Weak Heart specimen of physical and health ‘‘ Promotion and Conserva- ‘Colds h * * Consth —. *' Great Strength development the world has tion of Health, Strength .. Asthma .. Weak Back ..Lung Troubles known. and Mental a — Headache Weak Eyes Round Shoulders : ; the way from disease an Rupture Rheumatism ..Stomach Disorders Weakness to health and strength. It is priceless. I'll send it to you Thinness Nervousness Increased Height on request—FREE. Write for your copy today. Pimples Short Breath ..Muscular Development Insomnia ‘ TRONGFORT INS ORE TI TT Sia. Cp Bi Oe a ah EO LIONEL STRONGFORT, DIRECTOR, a Ree es weet ere ates oe Cone PHYSICAL AND HEALTH SPECIALIST Age... Occupation. DEPT. 473 NEWARK, NEW JERSEY, U. S. A. © es dtagatin leg SSE ee ere he, Te ‘ Rete reece trae er istceneenenevideewessi ee

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|_ Ailment — — er Rurns School of Wrestline. A337 Ramee Bldg

14 POPULAR MECHANICS ADVERTISING SECTION Tobacco Is Hurting You Look at the facts square in the face, Mr. Tobacco User. You may think tobacco is not hurting you. That is because you haven’t as yet, perhaps, felt the effects of the nicotine poison in YOUR system. For you know that nicotine, as absorbed into the system through smoking and chew- ing tobacco, is a slow working poison. Slow, yes—but sure. Tobacco is lowering -your efficiency. It When your hands begin to tremble— s . 2 and your appetite begins to fail— slows amandown. Makes it harder for you $n ¥our heart seeme to “skip a beat” now and then— to concentrate your mind on your work. You andslight exertion makes you short of breath— haven’t near the amount of ‘ ‘pep’’ and energy then you have a right to suspect that . eve ita . . a _ TOBACCO is getting the upper hand. you would have if you stopped using It. There's Any well-informed doctor will tell you that these are _——— SCO many a man twice as old as you in years who's twice as only a few of many symptoms of tobacco poisoning. young in energy, simply because he lets tobacco alone. And YOU know that the use of tobacco in any form Some day you will realize to what an alarming extent is an expensive, utterly useless habit. You know you tobacco has undermined your system. ought to quit.

Tobacco Habit Banished Let Us Help You 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— Tobacco Redeemer will positively remove all craving for tobacco in any formin a very fewdays. Not the slightest shock to the nervous system. Your tobacco craving will usually begin to decrease after the very first dose—there’s no long waiting for results. Tobacco Redeemer contains no habit-forming drugs of any kind and is marvelously quick, scientific and thoroughly reliable. a

P It is in no sense a substitute for tobacco. After finishing [Z - the treatment you have absolutely no desire to use tobacco again or to continue the use of the remedy. It helps to quiet the 00 ou | nerves and make you feel better in every way. Asingle trial will convince esu ts uarantee you. Our legal-binding, money-back guarantee goes with each full treatment. We will refund every cent you pay for the treatment if after taking it according to the easy-to-follow directions, it should fail to banish the tobacco habit completely.

NEWELL PHARMACAL CO. Dept. 300 Clayton Station St. Louis, Mo. Please serid, without obligating me in any wy

Let us send you our free booklet on your free booklet rezarding the tobacco habit an SEND Coupon for oett -- ot — . 8 : proof that Tobacco Redeemer will positively ! “4 gether with testimonial! letters from " - will be refunded Free Proo men allover the country telling how q from the tobacco habitor my money will be re they have been absolutely freed from the tobacco habit by this simple f home treatment. You could not ask for stronger proof that Tobacco Redeemer will free you from the habit than the evidence we will gladly t 4 Name neccqunsddbsedboobotboutesentocccenossccadeyueneeunorces send on reguest. Just mail the coupon—or a postal will do. | NEWELL PHARMACAL CO. Te Miaaietlls amtontaineniinpeneibenmens me Dept. 300 Clayton Station St. Louis, Mo. t | OO.

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POPULAR MECHANICS ADVERTISING SECTION 49 link JUR hew- ie are form ry you 2 ais, Mo. any way abit and y free me efunded operate a safety razor?” demands one blade for five years, and from the looks of things, the blade will outlast me!’ You men who think you are lucky if you get a week's service out of a $50 to $200 a Week KRISS-KROSS is so astonishingly efective in rejuvenating all makes blade—think that over! But don't t blades that any number of waste time envying the man who is men are earning sur- banking the money he used to throw Pt ims by repre- away on razor blades! Join the army of KRISS-KROSS shavers right now! You'll never know real shaving com- ber is in their terri- tories. Even spare-time men, office and factory ke as much s $6$12 a day extra nisi You can't possibly realize how KRISS- howing KRISSKROSS to KROSS will brighten your mornings and save your money until you have seen and tried it nd fellow-employees. Jas. Tillotson paid entire expenses of yourself. So don’t to take advantage of our 3 acation tiip with KRISS- — ’ SS profits. One day he made H. King made $66 in a R. Vanderhof sold 27 in 844 b —cleared over $50! Emil Ham made $200 his first four days, wh S. Kantala made $154 in 3 working just an hour or two each evening!) Why not get your st f these easy profits? We > bas! a« “— P Pendleton Ave., St. Louis, Mo. | verything and back you to the 1418 Pendleton Ave., Se. Louis, Mo. | Check bottom line of coupon y Send felt dues of KRISSKROSS and your Fre | t our big-profit plan at once! , _— . | | Name | : | des [| Address ! RS KRISS KRO | | J Cit dg biaee State | Rhodes KRISS-KROSS CORPORATION, Dept. G-372 STROPPER | Check if interested in making money as a | J rld’s Largest Manufacturers of Mechanical Stroppers. acceask-ten HO saysit costs alot of money to 3 Mr. M. T. Main of Kenosha, Wiscon- sin. “Using KRISS-KROSS stropper, bd I have been getting slick shaves out of Amazing Offer Means...No now in effect. This fort and economy until you do. For KRISS-KROSS actually rejuvenates all makes of safety razor blades (except Durham). It makes them keener than new! Eleven seconds in a KRISS- KROSS Stropper will actually make the oldest blade you own deliver a shave so cool and velvet-smooth that you won't believe your own eyes! That's because KRISS-KROSS actually duplicates the diagonal stropping stroke of a master barber! No wonder more than a million men say KRISS-KROSS has solved their shaving problem for- ever! More Razor Blades to Buy! offer includes an amazing new kind of razor, now given Free to KRISS-KROSS enthusiasts Absolutely unique and different Adjusts three ways in a jiffy. Re no cleaning or assembling. Gives a sli creascs beard res with five nev probably the last you get! Do not delay, for this é unusual offer is limited and may be withdrawr at any time. Mail the coupon. It will bring full without obligating you in any way. Rhodes KRISS- KROSS Corp. Dept. G-372 KRISS-KROSS Representative

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eocces scenes seeceeseccesonesereccesses DUALC....cccesce----—*” 1418 465 POPULAR MECHANICS ADVERTISING SECTION WO OY f SOs you pledge E-- in A They all await you in Aviation. Experts who yourself to secrecy we will can fly—who can design, build and repair air- teach you the secrets of Real Projfessional planes and motors, are in big demand every- where. You can make from $75.00 to $500.00 a week after thorough training. You may be internationally famous ina year! Prepare for Big Pay Jobs We give you complete and thorough flying and ground instructions on modern equip- ment such as Travel Air, Waco, Eaglerock and other new-production ships, and on Whirlwind, Siemens and other new engines. into this great that is making You'll be taught Air Navigation, Meteorology, Aero- dynamics Airplane Construction and Maintenance, Mote or Overh = 9 Airport Management—and you'll learn to fly by flying with expert transport pilots. You'll find yourself in a hotbed of aviatic ivity ¥ u'll see all the latest pla zooming sad ro " corm our field. Parks is not a correspondence s« i Neo talent or qupertence necessary. Fascinating ork. Pays big Compiete instruction a = tells ob aout Alphab. ts, Cok iors, How to Miz Paints, Show Cards, Window Board and Wall Signs, Ready made letters, as Tricks of the Trade, also gives 100 Alphabets and De- signs. Book bound in Rexitle imt. leather- J a gold edges. and four ball bearing Show Card Pens. Sent postpaid $3.00..C.0.D.) l0cex. a HM Ogilvie Pub. Co..57 Rose St. Dept 20. W.¥. City worl, presi B \\\\/// EARN MONEY /MMEDIATELY=~ B i 4 WE FURNISH EQUIPMENT TO START: ea Magician? | -stronc man poorer Frit Send your name and address to the Milo Bar Be ll Co. and receive Earn $250 to $1000 a Month a large 48-page booklet on *“‘How to Get Strong.” It’s FREE and no obligation whatsoever. For the first time in the history of Magic the age-old, THE MILO BAR BELL CO. —P.M. 6-2747 N. Palethorp St., Phila., Pa sacredly guarded secrets of Mystic Art are bein LEARN PIANO TUNING AT HOME inn revealed. Now at last you can learn to be a Rea Professional Magician. Yes, and you can learn this Send tor FREE copy of the 30th AN- ¥. a NIVERSARY EDITION of our book, —— “Winning Independence’. Read how — our — wonderful art easily and quickly AT HOME. You are taught the mysterious Principles by which the Profes- sional Magician works. But before you can study, you must sign the Magician’s Solemn Pledge of : ¢ . stude ants master tuning with et Secrecy. This means you are getting the guarded TUNE-A-PHONE, and WHY our graduates hes d the profe ion io secrets of the Magic Profession. all ps arts of the world. With Bryant's patented devices, tools. charts , > and lessons, one learns quickly and easily. Low tuction; easy terms t Mail coupon now for big free Diploma granted. MONEY-BACK if not satisfied. $10.00 to $20.00 ~ Magic Book telling all about a day, exceptional opportunities and an ideal profession awaits you th Tarbell C i ic Mesls, Gat@ulas Prices Boney Wrtay wed nny bo, BRYANT SCHOOL OF TUNING, 31 Bryant Bldg., Augusta, Michigan pny -cenp aggeeaccgepmcumi, GF Fi BF Gye TTS aie Tarbell System, Inc., Studio A-135 oe and become independent. We help you secure a position a _ 1920 Sunnyside Avenue, Chicago, Ill. B | sr.cours warcumanine SCHOOL: Dept. 8. +O" sr. Louis. mo. a Gentlemen: Without any tall abo send me your free @ - @ literature and information all about your wonderful & Days Free Trial - a ‘Tarbell Course in Magic.” Also tell me about your & New Models now ready for delivery a Low Price Offer and Easy Payment Plan. Fr ae from our i por bey ypu ou get q low prices 4 a A AGENT ED to ride and exhibit ae ee ee ae ee Ae ee See * a Make big money. Many models $ 1°50 . . ies (are ase S i OEIIIB ee 50. non cnnnnmswnncwsenecaeessasmbenepeccesccasceaasanit a , ae oS S o Mone ip wns a u = a our A+. Mead terms on RANG

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RMS VEE VERA LEU, SCRE. Were : [) Check if interested in making money as a nmumenial — P endletea Ave., St. Louis, Mo. SI NUPIFEN | | KRISS-KROSS Representative ld’s Largest Manufacturers of Mechanical Stroppers. POPULAR MECHANICS ADVERTISING SECTION 47 HELP’ HELP” HELP)

© Thousands of | Big Pay JoBs CryinG For navn’, AUTO MECHANICS constantly stepping into big pay jobs and are opening their own repair shops. McSweeny trained men are earning as much as 3 to 5 times their former salaries. There are opportunities for trained men everywhere. $75 to 5125 as Auto Expert “Won 8 WEEKS Why work for low wages? Why beg for a raise of a 8 short weeks of pleasant work on real few dollars a week? Thousands of positions are open at sg ge — aes tools. h.. ork on $50 to $125 a week. McSweeny trained men are in de- [** onal abaine ~ Rng epteiaiens mand to fill these positions. Mail the coupon today etc. Ne Beoks —No Printed Lesson and take the first step toward a big pay job. Correspondence Course. All practical work, Mace Shop Plan Makes the Big Pay Man.” That ic the secret of my successful training a You Can Do What These Men Have Done °="# == D. M. Colli f Willi ilie, W. V writes, After finishing McSwee ony train: Full Information ing, I started as manager of a garage at $300.00 per month.’ Write today for _~ F rm *\ “J now own my own repair shop and automobile BOOK which ives you Sena, ond age meks ailone momo FULL INFORMATION o eaidin thanks to McSweeny training.” writes Geo my remarkable tuition one MAI Smith of West Alexandria, Ohio COL PON NOW—TO

Railroad Fare and Board Included in My Remarkable Tuition Offer

J. H. McSweeny, Pres.,

McSweeny Auto and Tractor Schools, s Dept. 11-H, Cincinnati, Cleveland, Ohio. 4 Without obligation on my part please send me de tails of your § remarkable tuition offer and your BIG FREE BOOK, S Di cschvdckeebiupedede sds ses ADDRESS Dept. 11-H oo eee 0% o: o2.00 ees CINCINNATI, OHIO CLEVELAND, OHIO

Learn Watchwork, Jewelrywork ARE YOU BASHFUL? A fine trade commandin and Engraving * Sesiery, ond your ween | You must overcome Bashfulness—Self Consciousness— Mental Fear—to succeed in the business and social world. Bend 10c¢ for amazing booklet, alwavs in demand. Address Horological, Dept. P, Bradley mt LY Achievement.” Tells how thousands have conquered Bashf{ulness Institute, PEORIA, ILLINOIS, for our latest catalog. SEYMOUR INSTITUTE 38 Park Row Dept. 162 Mew York City WORK FOR Fy “UNCLE SAM” ise eT $1700 to $3000 Year KS RAILWAY POSTAL CLERKS “Fesssunynstrrure ra Dept. D175, Roc ester. N. ¥. Y Postal Clerk and Mail Carrier coa 6.. QF REE 3 your well L ae beck with list of U. 8. Government positions now

TEE d receive REE and

Prepared training, I - tainab saot egies aa TRAVEL—See Your Country A e was placed SHOULD MAIL COUPON PF TROND, cc ccccccccccccccccccececcecccsccecececcoes . iW. Tucker.” MEN, BOYS, 17 UP IMMEDIATELY ? Steady Work No Layoffs ce eg ee ee ene — ofession ip | ol harts sy term i DRAFTING—Learn at home he # Michigan F. E. King was “a poorly paid clerk” when he enrolled for the home-study we | ING Drafting Course of the International School of Drafting. Through study Pad | and perseverance he became Chief Draftsman of the U. S. Steel Furni- Ps a. ture Co. He is now earning more in a day than he used to earn a“ | LOUIS, MO. in a week. ee 1 — A. J. Hutchins became Chief Draftsman for the wee. TERNATIONAL J yy American Strawboard Company and increased his Pad “scnool "GF Onart AFTING i salary 300% —also as a result of our training. “ vision There is no doubt that Drafting offers i a by a | a real opportunity to ambitious men v4 Without cost or obligation, please send | and it will pay you toinvestigate it. we me full details of your home-study course in | 2 DRAFTING i Mail Coupon for Free Booklet (7 82200... mmnmnnnnnnnnnnn L oa” Address iisineeedsenii diced aidliaicsaniniiati in |

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ieee se er ae ~ | MPC AC cvcxeE 00. dept.cioseenicaco MANS 18 POPULAR MECHANICS -ADVERTISING SECTION $20 a Day for Schreck **Use my name as a@ reference and depend on me as a boost- er. The biggest thing I ever did was answer your adver- tisement. I] am averaging bet- ter than $500 a month from my own business now. I us to make $18 a week.”” A. Schreck, Phoenix, Arizona. Makes $700 in D pie “Thanks to your interesting Course I made over $700 in 24 days in Radio. Of course, this is a little above the average but I run from $10 to $40 clear profit every day, 0 you can see what your training has done for me.”’ Fred G. McNabb, 848 Spring St., Atlanta, Ga. $3500 a Year for Beckett “When I began with you I was just a common laborer, going from one job to another, work- ing for anything I could get, and that wasn’t much. Now my sal- ary is $3,500 a year and the Com- $70 to $80 a Week for Jacquot “Now I am specializing in Auto Electricity and battery work and make from $70 to $30 a week and I am just getting started. I don’t believe their is another school in the world like yours. Your lessons are a real joy | | any furnishes me with an automo- vile,”’ Cc. O. BECKET" study LTT, Robert Jacquot, 108 Maple Heights, 2005 W.. Colorado Ave. N xgton, Ohio \ Colorado Springs, Col. I Learn to $3000 to ELECTRICITY ~The Big Pay Field~ NEEDS YOU NO Send Coupon Now It’s your own fault if you don’t earn more. Send the coupon and I'll prove it to you. Blame yourself if you stick to your small pay job when I have made it so easy for you to learn to earn $3,000 to $5,000 a year in Electricity. One billion dollars a year is being spent in electrical work. Electrical Experts are badly needed. Just send the coupon. Thousands of men are needed—trained as I train them, They can practically name their own salaries. Every- thing is ready but the men. Will you answer the call of this big-pay field? Get ready now for the big job I will help you get. The biggest money of your life is waiting for you. Send the coupon. You Can Do It Too? Let me show you that I can train you just like I trained the four men whose pictures you see here, Just like I have trained thousands of other men—ordinary every-day sort of fellows—lifting them un from starvation wages and starting them on the road to jobs that pay $60.00 to $100.00 a week. With my easily learned, spare-time course, I can fit you for one of the biggest jobs in electricity. Send the coupon and I'll tell you how. Quick and Easy to Learn Don’t have any doubt about your being able to do what these other men have done. McNabb and Schreck and these other fellows didn't havea EARN , \Home ~ Spare - time Only Needed S Outfits—Tools and § Apparatus Included § — —No Extra Charge In addition to giving my students employment service and consultation service, I give them also 6 complete working outfits without extra charge These include tools, measuring instruments, material and a real electrical motor—among the finest outfits ever put together. You do practical work right from the start. Afterthe first few les- fons it enables you to make extra money every week doing odd electrical jobs in your spare time Some students make as high as $25 to $35 a week in spare-time work while learning. L. L. Cooke, Chief Instruction Engineer L. L. COOKE SCHOOL OF ELECTRICITY 2150 Lawrence Ave., Dept. 1-A, Chicago Sasa aeaaeean » L. L. COOKE, Chief Instruction Engineer Dept. 1-A 2150Lawrence Ave., Chicago Without obligating me in any thing on you when they started. You can easily duplicate their success. Age g@ way send me your Free Book lack of experience or limited education do not bar you. Start just as you are and a and particulars of your Electrical i I will guarantee to train you at home with a signed money back agreement. If you are a Outfit Offers, Employment Servi - not 100 per cent satisfied with my course it won't cost youa cent. Mail coupon to me today. and proof that you can fit me for 3 J gat peost tnt yous Big Electrical Book—FREE J ierniy clecttical job The coupon below will bring you my big free electrical book—over 100 ine 5 teresting pictures. The real dope about your opportunities in electricity—positive proof 4 Name that you, too, can learn to earn $3,000 to $5,000 a year. Send it now. Send it while 4 the desire for a better job and more money is upon you. The Cooke Trained Man is: The Big Pay Man ~Always eeeeeeree eee eee ee eee e weer eneee PL 6 onccnceveeh Sehndtbhenbabanenee 7 IE 6 ots dadoenectnsnsssbeostnateesbeses

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loyment 2em also charge. uments, long the ractical few les- y every re time a week ineer ry jicago ams ineer ra -”

ot o en en enenan ease an enenasanenanasanenanananal POPULAR MECHANICS ADVERTISING SECTION 49 lassitied Advertisements WORLD'S BEST WANT AD

\ veers in this section, 30 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 TERTISE In 24 Big Sunday News- : words $15.00. Excellent for secur- , salesmen and business oppor- Catalog listing 1,000 leading weeklies, mail order magazines. g. Free. Wade Advertising, Bal- t tidg., Chicago DV 06 Page free catalog contains many and display bargain lists of news- ) nd magazines; 18 years experience. ‘inckerhoff, Inc., 37 W. Van Buren St.,

_ ADV! ERT [SE 50 Magazines 5c word, $4.00 rice 10¢ word, $8.00 inch. King- 4 sing, Box_6723, Wilmington, Del. BEFORE Advertising get our “catalogue. N harge. 25 years in business. The

large lassified agency in the _ world. ankru Advertising Agency, 20 W. Jackson Bivd., Chicago TM. tele. B.) 1%.. LOWEST Rates. Catalog free. Owl Ager Times Bldg., New York, FREE—New 1928 Advertisers Rate Gulde. " $. Includes everything. Lowest rate Ee. H. Brown Advertising Agency, 140 S. Dearborn, _Chicago. Je Display 50 Monthlies Thrice $8.00. Adme $112M Hartford, St. Louis, Mo FOR ADVERTISERS ERTISE—28 Words in 72 country

town newspapers $3.40. Lists free. Miller, 127M Bellevue Ave., Syracuse, N, _# THE Leatherneck, marines’ magazine. readers. Marine Base, San Diego, IDVERTISE In weekly papers. Lists fr Keator, Hartford Bldg., Chicago, __ WORDS Insert 60 magazines $2.00. I Agency, Shawano, Wis. AUTO Parts, New, Used—Lowest prices, largest stocks, bankrupt supplies, motors, wheels, rear ends, radiators, transmissions, generators, gears, tops. Brightman, 2065 Main St., Hartford, Conn. KADIATORS at wholesale prices. All standard makes. Satisfaction guaranteed. Send for prices, stating make and model. Independent Radiator Co., 1119 S. Wabash Ave., Chicago. AUTOMOBILES PATENTS. Time counts in applying for patents. Don’t risk delay in protecting your ideas. Send sketch or model for in- struction or write for free book ‘“‘How to Obtain a Patent’’ and ‘Record of Inven- tion’’ form. No charge for information on how to proceed. Communications strictly confidential. Prompt, careful, efficient serv- ice. Clarence A. O’Brien, Registered Pat- ent Attorney, Security Bank Building (di- rectly across street from Patent Office), Washington, D. C. See pages 140 and 141. TRUCK Owners—Stop shoveling, dump your loads. Dependable Hoist Co., Streator,

SLASHING Price Reduction! Fine Har- ley-Davidson motorcycle bargains. New, used and rebuilt motorcycles, $50.00 and up. Send for our new Free Bargain Bulletin just off the press Knuth’s Harley-Davidson Agency, 2525 Fond du Lac Ave., Milwaukee, Wis. Exclusive Harley-Davidson Distrib- utors. “USED Motorcycle bargains. All makes Lowest prices Guaranteed Shipped on approval. New easy payment plan. Motor- eycle parts—supplies. Catalog free. Floyd Clymer, ‘‘Largest Motorcycle Dealer in the West,’’ Denver, Colo WRITE For free bulletin of late models Harleys and UHendersons from Chicago's largest dealer. Easy payments. Kemper Motorcycle Co., 1507 Michigan Ave., Chi- cago, TL ~NEW and used Motor ¢ ‘ycle Parts. Tower = Co., 3604 Kingsland Ave., Pine Lawn, “BARGAINS in used motorcycle parts for all makes. No Catalogs. J. B. Dahl, 3661 Archer Ave., Chicago, Ill AVIATION

BATTERIES AND BATTERY SUPPLIES BATTERIES, radio and auto. structions, $1.00: Tex. —————— AUTOMOBILE SERVICE EQUIPMENT JUNK Tires converted into saleable mds. with our Hoxie. $200 starts you Vul- canizing tires pays 100% Have shop out- fits near you $50 up. Portable electric paint spraying outfits complete, only 50 Ibs. $61 delivered. Equipment Exchange, 108 East lith, Los Angeles, Calif

How to make and ¢epair; Formula and complete in- Arthur Clarke, Paris,

SALES PROMOTION

“CAN You sell it? $ rO $50,000 Daily Sales Developed lur 28 years for clients by our direct copy, campaigns. One product, 2 j ‘idea; this year $100,000 orders v0ked Fifty year old concern desired 50 national representatives in 1925; we pro- duced 40 in three months. 700 dealers in months at $3 each, for another. Ten s Promotion Manager Larkin Co. S ales problems for free diagnosis. J ©. Johnson, 118A Woodbridge Ave.,

years Sale Buff hi SINESS” Building letters,” circulars, ta ns. Seientific methods guarantee re- § Long experience; reasonable rates. Fir Advertising, 107P, Concourse Bldg., City, N. J. YOUR Product will sell. Have us find salesmen, prospects, customers, or etters, folders, mail-order ads and te campaigns that get business. Out- ir problem to “‘Mail Merchandisers,’’ Maccabee Bidg., Detroit. We can! Marketing, ng, and sales promotion under our on bring results. Submit your m for Free Analysis. FP. A. Porter, Counselor, 156 Fifth Avenue, New ‘ ry l. Me your business troubles; your merchandising methods. Shaffer, k St., Indianapolis. BIG Profits in automotive electrical serv- ice with use of low priced testing equipment. Small down payment brings it—pnays for it- self with handsome profit besides Write for details, no obligation. E. C. Galbreath, Box M685, Troy, Ohio CARBURETOR Troubles’ We repair all makes. We also give a generous allowance on your old carburetor for a new one. Every- thing guaranteed. Factory representative, “The Carburetor Man,’ 3847 W. Madison St., Chicago, Tl. BIG Opportunity in 8 hour battery charg- ing. Let me tell you how you can install equipment with practically no investment. Earn $150 to $300 monthly from it. Bar- gains in used outfits. Write today. I. C. Helmick, Box M684, Troy, Ohio. “NEW Charging units that will charge from 1 to 5 six volt batteries from 32 volt line, direct current, neat and compact, guaranteed $15.75. General Distributing Company, Se- curity Storage Building, Duluth, Minn. BUILD Business with the best of air service. Bring car owners to your doors— no matter what branch of automotive service. Costs less to operate than others. Easy pay-for-itself terms. Free trial Write D. co. Jenkins, Box 683, Troy, Ohio. “START A business. New or used tire and battery shop equipment State what you are interested in. Wholesale only. Adams-Barr, Columbus, Ohio.

LETTER SPECIALISTS

VERFUL Letters $10. ‘8, New Bedford, Mass Cecile Serpa, “Th TERS, sales literature written. Long nee. Reasonable. L, Bartells, 504 St., Milwaukee. PEVPY Sales Letters, $5.00. Lincoln St., Chicago. . Hueser,

AUTOMOBILE SUPPLIES

Are wanted to resilver mirrors at Immense profits plating autoparts, ire, ete Write for information. le, Plater, 77 Marion, Ind.

FOR FORD OWNERS TNDERSLUNG With RRO” Swing Lo Trons. See ‘“‘Red-I-Cut” ad page 128 MOTORCYCLES, BICYCLES AND SUPPLIES

MOTORCYCLES Cheaper than Bicycles, $25 to $50 Easy terms. Tires $2.50; Frames $3; Forks $3; Tanks $5: Wheels $4; Chains $2; Saddles $5; Handle Bars $5; Engines $15; Auto Tires $3; Airplane En- gines $15; Bicycle Tires $1.25. Send 50¢ for catalog. Price Cutter Deninger, Roch- ester, N. “BUILD Your own

FLYING Instruction by air mail pilots the finest and most experienced flyers in the world. Col. Lindbergh was our chief air mail pilot and instructor, With such in- struction, this school has operated over 9 years without an accident, graduating over 500 students Our course and our equip- ment are of the very best and strictly mod ern. Average student flies by himself in two weeks, but we guarantee to solo you re- gardiess of time required No charge for breakage. First-class fivers are in great demand. Enroll now in one of the oldest and best known flying schools in America. Booklet on request. Write Dept. 0, Rob- ertson Flying Services, Lambert-St. Louis Field, Anglum, St. Louis County, Mo. ‘GET Into fiying now—learn at America’s finest aviation school in Chicago—the cen- ter of air activity—on the finest field in the middle west—where the air mail lands We give you complete instruction in our big downtown factory—you actually work on motors and ships You fly at our airport in brand new ships with licensed instruc tors. No limit to your flying time. , Write for our “ig free book ‘‘How to Fly.’ Free to you tor the asking. Chicago ‘astute Company, 725 S. Clark St., Chicago, Il BUILD Mode! airplanes that fly. Our 52 page catalog illustrates 26 flying and exhibi tion models. Most complete line of acces- sories and supplies. Send 10 cents for our big catalog. U. S. Model Aircraft Corpor- ation, 341 Monroe St., Brooklyn, N. Y JUST Out—Book and blue prints on de sign, construction of small sport plane. De- pendable information on motors to use, ete Includes flying lessons and weather map reading All for one dollar Chas. Rus- sell, 545 Stadium Drive, Ft. Wayne, Ind NEW! Three models in one Perfect scientific reproductions Catalog free. Stew- art Marshall, Rome, Ga sportplane. 18-60 horsepower monoplane, cheap to build: biue- prints and instructions $2.50 Biplane, two seater, 28-60 horsepower; blueprints $5 Sketches, 10¢ each. Allison Airplane Co., Lawrence, Kans. FLYING Instruction complete. Two lessons. $1.00 each. Church, Box 2518, San Fran- cisco, Calif SIMPLEX Air Model Co., Auburn, Mass. Send for free booklet MODERN <Aircraft—New book describing fully all latest developments in newest planes and engines used in recent trans-oceanic flights Just what every student of flying needs Covers every phase of aeronautical science 855 pages Over 500 illus Pay postman $5 and postage when he delivers the book. Popular Mechanics Press, Room 805, 200 E. Ontario st., Chicago, Til.

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50 POPULAR PATENTS Time counts in applying for patents. Don’t risk delay in protecting your ideas. Send sketch or model for in- struction or write for free book ‘“‘How to Obtain a Patent’’ and “Record of Inven- tion’’ form. No charge for information on how to proceed Communications strictly confidential. Prompt, careful, efficient serv- ice. Clarence A. O’Brien, Registered Pat- ent Attorney, Security Bank Building (di- rectly across street from Patent Office), Washington, D. C. See pages 140 and 141. “AERODRIVE” Propeller boat attachme nt blueprints, 50c. Propellers, 4’, $8.75; 5’ $13.25; 6’, $16.50; others propo rtionately. Leather helmets, $1.50: goggles, $3.00. Os- tergaard Aircraft, 4309 N. Narragansett, Chicago. DICTIONARY Of Aviation, $3.90. Lan-

guages Publishing Company, 15 W. 18th St., New York “BUILD A “Dixie” monoplane at home. 20 ft. wingspread, 72 mph., 12 hp. motor, 300 mile radius. Plans and working draw- ings complete $10.00. Warner Co., 311 Ed- wards Bldg., Cincinnati, Ohio. “LEARN Aviation. Thirty endorsed by aviation experts ject thoroughly explained. Diploma given. Free employment service. Send $15.00 now for complete course, silver wings, etc., or $3.00 week or month until $18.00 is paid. National Aviation Training, Detwiler Bldg., Dept. M, Los Angeles, Calif. COMPRESSED Air for model airplanes. Send stamp for cir- cular. Model Machine Shop, 212 Price St., Rahway, New Jersey. NEW Aircraft magnetos, 6 or 8 cylinders, cost government $75.00, sacrificed $7.50. Real airplane propellers, 8 foot long, given away, $5.00. Air Transport Co., Carle Place, N. Y. CONVERTED Motorcycle engines for air propulsion, suitable for boats, sleds, ete. Propellers, $8 to $15; hubs, $6; new Le Rhone 80—$95. Send dime for catalog. Sensenich Bros., Lititz, Pa DOWAE Stunt Plane. spirals. Ready to fly. $1.00 postpaid. Springfield, Mass. FLYERS, Students: Send 25c¢ coin for our complete course in designing, building and flying. Dix Engineering, Dept. B, Box 302, Allentown, Pa “AVIATORS” Wanted Pilots and me- chanics. We prepare you in short time. Lowest rates—complete thorough courses. Send for free booklet, ‘‘The Why’s, Where’s, How’s of Learning ‘Aviation.’ ’’ Atkinson Aviation Company, Dept. D, Gary, Ind SCALE Model Airplanes ready to filv—all types. Send dime (3 for 25c) for Flying Glider and catalog The Clinton Toy Co., tox 141, North Haven, Conn. 12 GENUINE Photo miniatures of famous planes only 35c (coin). G. ). Hesse, 449 Troutman § Brooklyn, N. Y. BIGGEST. Best Catalog Model Airplanes, Parts, Supplies; 5¢ postpaid. Ideal Com- pany, 19 West 18th Street, New York. PARACHUTES. Specify weight. Thomp- son Bros. Balloon Co., Aurora, Il. Estab- lished 1902 ~ SEND Dime for 12-inch mounted propeller and circulars on free three-foot model aero- plane. No selling. Aero Shop, 3050 Hurl- but Ave., Detroit. Mich “SKYWARD Ho!” New book by Derek White on your future in aviation Opens road to career, fame, fortune Sent free. Write at once. Parks Air College, 213 Mis- souri Theatre Bldg., St. Louis, Mo. THE American School of Aviation an- nounces a new correspondence course in Mechanics of Aviation. A thorough train- ing in Practical Aeronautics American School of Aviation, Dept. 1871, 3601 Mich- jean Ave ~¢ Chicago. TH lesson course Every sub-

engines and tanks Loops, climbs and Durable, educational. Dowae Toys, Box 1396,

ADVICE In glider and airplane < contrue- tion. Blueprints price list, 25 cents. J. P. Schroeter, 452 Broadway, Milwaukee, Wis. ~~ AVIATION For. Everybody. idly. New book, just issued, suitable for beginners, young people, students of flying, ete., who want something non-technical to teach them the control systems and methods of fiving all tynes of land and sea fiving

Coming rap- machines. Strictly up-to-date. 256 pages Tilustrated. Price $2.00. Sent C. O. D., if preferred. Popular Mechanics Press, Room

805, 200 E. Ontario st., Chiago, Til. MECHANICS ADVERTISING BOOKS AND PERIODICALS THE Kadio Book of the day-—‘‘Radio Theory and Operating’’ by Mary Texanna Loomis, president, Loomis Radio College; member Institute of Radio Engineers. 8386 pages, 700 illustrations, $3.50 postage paid to all countries. On sale bookstores through-

out United States, also Shanghai, China; Melbourne, Australia; Wellington, New Zealand; London, England; Calcutta, India; and Honolulu, T. H. Buy of bookdealer or send check or money order to Loomis Pub- lishing Company, Dept. M, Washington, dD. C

SAVE On plumbing bills—Repair your own plumbing and heating system. A prac- tical book written expressly for the home owner by an experienced plumber, is easily understood and will enable you to make your own plumbing repairs with a great deal of satisfaction. Price of book only $1, plus postage. Send no money. Pay postman when he delivers the book C. O. D. Popular Me- chanics Press, Room 806, 200 E. Ontario st., Chicago. EX Checker Calculator and Book. Very good for adding, subtracting, multiplying and dividing; 6 places $1; back if not satisfied; 1 wk. surpasses slide rule; flat for pocket. Agents 30%. Circulars on many new things

of utilic advantages. Dr. W’'l’s, Spec., Audubon, Pa. BOOKS, Magazines, art publications In French, Spanish, English. Photo novelties, ete., samples, lists, 20 cents stamps. Villa- verde Co., Dept. 207, Box 1329, Havana, Cuba. INDUSTRIAL Alcohol. Wright’s book. Full directions for making, fully yg $2.50. Spon & Chamberlain, 120 P.M. Lib- rf

erty Street. New York. N. 2 HYPNOTISM Easily learned. Lessons guaranteed. Postpaid, $1.10. Smith Pub. Co., Dept. 3, Springfield, Mass. —WHE RE’D Cain Get Wife? 15 pages 20c. Black Studio, 1249 8. Grand, Los Angeles. PICTURES AND POSTCARDS SEE The only tree in the world that owns itself. Sepia Post Card Mount Rushmore memorial, by Gutzon Borglum, sculptor, Sepia Post Card. 15¢ each or both 2%c post- paid in envelopes. E. B. Magill, Box 256, Toledo, Ohio. ~ FREE — True-Blue _ Tis' postcards, stamps. son, Elroy, Wis. MAGIC TRICKS, BOOKS AND JOKER NOVELTIES MAGIC—Tricks, Books and Supplies. For amateurs as well as the great professionals. Anyone can learn through our instructions. Feature Acts in Mind-Reading. Spiritual- ism, Rope Ties, etc. Large illustrated pro- fessional catalog, 20c. Chicago Magic Co., 140 So. Dearborn St., Dept. B, Chicago, 1 AMAZE And Mystify! New 1928 “Fun- Magic-Mystery,”’ profusely illustrated; ex- plains many tricks. Also catalogs 750 Tricks—lIllusions — Jokes — Puzzles—Books— Imported novelties at reduced prices. Post- paid 10c. Lyle Douglas, Station A-5, Dal- las, Tex. ELECTRIC Fun! Seventy stunts, 110 volts, $1. Cooper Sons, Campbell, Calif. ILLUSION And Trick Catalog 20c. Lynn's, 105 Beach, Jersey City, N. J. ~~ GARD Tricks, coin tricks, hypnotism, ven- triloquism. Instructive 64-page books, 10c¢ each. George Fenner, 2401 Jefferson, Louis- ville, Ky. FREE with $25 order die box. Send 20c¢ for our large catalogue of tricks, wigs, sen- sational escapes. Oaks Magical Co., Dept. 548. Oshkosh. Wis. __ : “SEVEN Magical Delusions and Catalogs —25¢ Gilmagico, Morgan Park, 4 GAMES, ENTERTAINMENTS AND PLAYS

listings. Exchange Membership, 25c. Eric-

PRIZE-FIGHTING Pair of dummies, op- erated by patrons; exciting bouts, knock- outs possible; interesting, entertaining, gets the crowds. Patented. Some exclusive ter- ritory still available. Michael T. Lane, 901 Harris Trust Bldg., Chicago. “LINDY-Take-off.” The great aeroplane puzzle A lifetime of fun for old and young Indestructible. Send 2%¢ to Star Novelty Co., Box 83, Linwood Station, De- troit, Mich. VWPCOCUPGLIVE cee eeeeeee eeeeeseeeeeeoeoos eee” SECTION PUNCH And Judy, ventriloquism, tions learned by mail. Information 2 Scott, 719 First, New Orleans, La ~ LEARN Ventriloquism by mail—smali cost, 2c stamp brings particulars. Geo. W. Smith 125 North Jefferson, Room 8-260, Peoria, 1 STAMP COLLECTING HERE Is a chance to improve your album with some fine packet bargains—Scott Seajq Packets—every stamp guaranteed genuine Packet No. 342, Dutch Indies, 25 dir for 25c; No. 255, Africa, 25 different for 10c; No. 185, Lichtenstein, 20 different for 10c; No. 187, Netherlands, 25 different for 10c; No. 51, Central America, 30 different for 20c; No. 91, Guatemala, 50 different for $1.50; No. 169, Central and South Ar eric a 200 different for $1.50; No. 271, Czech vakia, 50 different for 10¢; Ne. 177, many, 200 different for 30c; No. 181, Ive. land, 20 different for 40c. More than | 109 packets and sets are listed in the free Scott price list. Ask us for a copy. Scott Stamp & Coin Co., 1 West 47th St, New York, N. Y. 500 DIFFERENT Stamps for 25c! Big collection 500 different stamps from Bosnia- Herzegovina, Crete, Epirus, Hong Kong, Ice- land, Kenya and Uganda, Liberia, Malta Nyassa, North Borneo, Orange River Colony Siam, Wallis and Futana, and other ‘hard’ countries. Catalog value $10.00. Price only 25¢e to approval applicants! Special gains, 1,000 different 79c; 15 triangle stamy 49c; 100 Africa 45c; 100 Asia 5S0c: 100 Balkan States 35c; 100 British Colonies 2% 100 French Colonies 30c; 100 Portugese (»\- onies 50c. All 8 packets for $3.00! Illus- trated lists free. Loma Stamp Co., 3926 S2nd St., San Diego, Calif. MYSTIC ‘‘Queer Country’”’ Packet! Cor tains scarce stamps from the following strange lands: San Marino, Antioquia, Congo, (y- prus, Fiji Islands, Gwalior Hyderabad, Ice land, Jhind, Kenya, Uganda, Lebanon, M aco, North Borneo, Nyassa, St. Thomas Prince, Eastern Roumelia, Siam Sierra Leone, Tanganyika, Trinidad Tobago, Uban- gi, Upper Volta, Wallis Futuna, Alaouites. Get this wonderful packet of ‘‘freak tries’’ and make your friends envious! Price only 10c to approval applicants! Write day. Mystic Stamp Company (Dept. 8 Camden, N. Y $1.00 FREE. Black U. S. Postage, Given Away with each order. Pioneer Stamp Al- bum with 500 illustrations. 150 different stamps from 40 countries, Syria, Lebanon, Hejaz, Liberia, New French Colonies, Brit- ish, Portuguese Colonies, South Africa, Aus- tralia, 500 hinges, 36 page illustrated cata- logue. All for l5e Big Commission to Agents for the Best approval sheets of stamps ever offered. Write for sample t fit Hugsman Stamp Co., Dept. M, 620 Olive St., St. Louis, Mo. ANCHERS $$$ Outfit—only 12c! Fine triangle stamp; set German stamps with (pre-war) value forty million dollars (1 teresting!); perforation gauge, mme scale small album; airmail set; scarce stamp from smallest republic on earth; newspaper set; packet good stamps from Travancore, Malay Dutch Indies, ete. Entire outfit for 12c to approval applicants! (Nice pocket st book, value 25c, with every order!) Ancher we af Co., 148% Clerk St., Jersey Cit “WONDERFUL collection 205 differs stamps from Gwalior, Haute-Volta, K ang-Tcheou, St. Thomas, South Africa (Springbok), and other ‘“‘hard’’ countries; fine triangle stamp; package hinges; © lometre scale, ruler; copy largest stan imita- Stamp,

erent

the world (China ‘‘Wild Goose,”’ 40c!); big illustrated lists. Total Va $4.50. All for 10c! Also approvals. ! dian Stamp Co., 103 Howard Si., Bane Maine ~J00 DIFFERENT Foreign Stamps from 100 different fereign countries, including Africa, Asia, Australia, Europe, Wes! |! dies, etc., for only 20c. Free with each der, our pamphlet which tells ‘How Make a Stamp Collection Properly,”” toget! with our price lists of albums, supplie hundreds of bargains in sets, packets Queen City Stamp & Coin Co., Room 604 Race St., Cincinnati. Ohio. 87 DIFFERENT Countries! Cyprus, |) homey, Indore, Jhind. Somali, ete. ™ velous packet 87 different stamps fron different countries; many scarce Twe cents, but only with approvals. Lists f Reimers, 9 Flatiron, Fort Worth, Tez

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imita- Lamp, | cost, a, Ii ——

~ CEYLON, “FREE — True-Blue AS, Dail, 64 SEBEL, SU POPULAR ris Big Four! New set 6 Greece (beau- tifu enes); new set 3 Turkey (blacksmith - § Costa Rica (gov’t adv. bag Japan (famous earthquake set). " 6 Ree price 50c. Special to approval ap- pli ide. Dennie, 7763 Logan, Detroit, M — . % » $2 TO $500 Each Paid for hundreds of old and odd coins. Keep all old money, it may be very valuable. Bend 10 illustrated coin value book, 4x6. Get posted. Guaranteed prices. We buy and sell. Clarke Coin Office, LeRoy, N_ Y. OLD Money Wanted. Will pay fifty dollars for nickel of 1913 .with Liberty head (no Buffalo) We pay cash premiums for all rare coins. Send 4c for large coin folder. May mean much profit to you. Numismatic Co., Dept. H, Fort Worth, Tex. UNITED STATES and Foreign Money: Military Decorations Catalogue and Greek

= 10c. Alexis Mengelle, Colorado Springs. olo.

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on - UNITED bronze, three-cent 25¢. Fifteen dates George Coftin, Greenwood RARE Coin Book, 162 pp STATES, Large cent, two-cent nickel and Bargain List, large cents, $1.00. Mountain, Me. 28 plates, U. S. and foreign. Prices paid, 60; 32 pp. retail list and 3 bills, 6c stamps. Elder Coin Corp., 8 West 37th St., New York. 25 DIFFERENT Coins, 50c 22 different bills, 25c. Oddehon, Box 681, Kansas City, Mo CALIFORNIA Quarter 20c, half 50c. Brooks, 114 Cisco, Dallas, Tex FOR BOYS boys and girls to sell nov- Don’t delay. WE Want 500 elty cards; complete outfit free Greene Printing Co., 215P Davis Ave., Dayton, Ohio. BE A “‘Daddy Long Legs,”” walk on Hi-Lo adjustable stilts Send only $1.00 and we will send you pair postpaid. B. & R. Mfg. d Co., 1249 8S. Michigan Ave., “THE Boy Electrician,’’ illustrations, 30c, . Tillbergh, Vt Chicago. pocket size, 75 Proctor, BOYS—Strongest and most powerful sling- shot—20c silver. C. Brunner, 1718 No. May- field, Chicago CAMERAS AND PHOTO SUPPLIES PHOTOGRAPHIC Equipment and acces- sories of every description are listed and illustrated in our 228-page catalog. It will pay you to secure a copy which is issued free, as our prices are low We also deal in used goods which are sold under the ame guarantee as new goods Ask for our Bargain Book. Central Camera Co., Dept. E130, 112 S. Wabash Ave., Chicago, Il. KODAK Films enlarged; sample 3x5 mounted in folder like portrait, 15« Roll developed, six prints, 25c Six postcards 25e¢ Commercial Studio, Carthage, Mo. “~POZEN Prints 50c; velvet green free Skees, 151 Chesterfield, Pittsburgh. ROLL Developed and seven prints, one print hand colored, 25« Pasco Photo Labo- ratorie Dept. P, 2921 Nicollet Ave., Min- neapolis, Minn. MAKE money in quickly at home, Spare or full time New Plan. Nothing like it. Experience un- necessary American School of Photog- raphy, Dept. 3431, 3601 Michigan Avenue, Chicago BIG Money in Free. Ne fork 10 West 33d St., New York a EARN big money with your camera in your spare time, using Halldorson Home Portrait Lamp Write for booklet ‘‘Home Portrait Photography’’ and catalog—both free The Halldorson Company, 4747 N. Western Ave., Chicago ~ SAMPLE Enlargement, 5x7, 25c silver, and negative (returned Trial roll fin- ished, three dimes Brown, Warsaw, N. C. ROLL Developed—Six print one beauti- fully tinted, 25c 8x10 enlargement Oe. Falls Foto Finishers, Dept. A, Glens Falls, photography ~~ Learn Catalog 49A of Photography, Photography Institute N. Y HAVE You a Camera? Write for Free sample of our big magazine, showing how to make better pictures and earm money American Photography, 116 Camera House, Boston, 17, Mass AMATEURS—Develop and print your own kodak films Ten tested and guaranteeed formulas sixty cents Monarch postpaid. Sales Co., O-we-go, N. Y ~ RODAKERS: Give your films a chance Real finishing 35c any size roll. See what good prints look like.» Cassens Art Studio, Drawer 256, Litchfield, Ill. FILMS Developed Special Trial Offer Any Size Kodak film developed 5c, prints 3c each. Trial 6x10 Enlargement in handsome folder 40c Overni Service Roanoke Photo Finishing Co., 209 Bell Ave., Roa- noke, Va $50.00 FOR Photographs—This price paid for photographs if they meet our require- ments. Perhaps one of your pictures will bring this amount, For particulars, ad- dress Redkrafts, Dept. 11, Denver. Colorado. MOTION PICTURES MOVIE Films, 1,000 ft. reels, $2.50 each; shipped anywhere on receipt of remittance. Particulars on request. Independent Films, 177 Golden Gate Ave., San Francisco, Calif 2 POPULAR MECHANICS ADVERTISING NEW $150 Spring movie camera, $37.50; 35mm film, 242ec foot; Film Camera $100 Cine Kodak 16mm camera, $50. lémm, 100 ft. negative film, $4.50 postpaid 100 ft. complete 16mm comedy, western travel, or war reel, $4.50. Cameras, projectors and films bought and exchanged New twin are movie lamps $40. 3%x5% Kodak, $9 Ray, 296, Fifth Ave., New York STARTLIN Bargains in motion-picture cameras, projectors, apparatus. Send stamp for the 192nd issue of the Bass Bargain- gram. Never in history has such startling bargains been offered in guaranteed ap- paratus. Write for your copy now. Re- markable motion-picture exposure meter, $2.00. Sixty-six page catalogue. Send stamp. Bass Camera Company, 179 W. Madison St., Chicago, Ml $1,250.00 FOR A photoplay story by an unknown writer and sold through our sales department We revise, copyright and mar- ket Located in the heart of the motion picture industry. We know the demand Established 1917. Postal brings free booklet with full particulars Universal Scenario Company, 206 Western and Santa Monica Bldg., Hollywood, Calif MOVIE Films Ic ft.; 200 ft.. $1; reels, $2.50 up. Stamp brings samples and list. X. Sales Co., Box 1506, New FILMS $2.50, $45.00 Haven, Conn. Projector $100.00, camera Stewart Marshall, Rome, Ga. BE A Movie Exhibitor—Big Opportunity — Only Moderate Capital Required—Com- plete Equipment at Remarkably Low Prices. Write Atlas Moving Picture Co., 624 South Michigan Ave., Chicago, Il BIG Money in Photography. Free. New York 10 West 33d St.. New York FILMS—200 Feet 95c. Reels $2.50 List. Beware Tieman, P. O. Box 155, Blue Island, NEW and Rebuilt Projectors for Theaters, Catalog 49A Institute of Photography, Schools, Churches, Traveling Shows Sup- plies and Complete Theater Equipments Bargain Prices Free Catalog Monarch Theatre Supply Co . Mem; his, Tenn PROJECTORS And films sold and Toaned, also toy films. Richter, 756 East 155th St New York ‘FILMS And slides. Send stamp for lists Bargains. Clifford Hoffman, Albany, N 3 SCENERY TO RENT WORLD’S Most Beautiful Settings for operas, plays, minstrels. Amelia Grain, Philadelphia EDUCATIONAL AND INSTRUCTION GET Into big-pay end of radio—the sales division. 10,000 big dealers need specially trained men to sell new A. C. Radios and electric phonographs. I train you by mail and place you anywhere in U. 8 vo past ex- perience necessary My graduates earn $256 to $850 a month. Earn while you learn. Write today for details of positions now open. C. H. Mansfield, Dept. 71, 1031 So. Broadway, Los Angeles BE A Landscape Architect—Splendid earn- ings, real success awaits you in this un- crowded profession. We train you by corre- spondence Personal guidance by noted authorities, helping you get started. Imme- diate income possible Catalog free Write today. National School of Landscape Design, 518 Equitable Bldg., Des Moines, Iowa STORY Ideas wanted for photoplays mag- azines Big demand. Accepted any form for revision, development and submission to markets. Established 1917 Free booklet gives full particulars Universal Scenario Company, 406 Western and Santa Monica Bldg., Hollywood, Calif ~~ $1,140 TO $3,000 Year S. government life position Steady work. U Men—women, 18 to 50 Short hours Pleasant duties Common education sufficient. Experience un- necessary Sample coaching, list positions and full particulars, free Write immedi- ately. Franklin Institute, Dept. D14, Roch- ester, N. Y. FIREMEN, Brakemen, baggagemen (white or colored), sleeping car, train porters (col- ored), $150-$250 monthly. Experience un- necessary 810 Railway Bureau, East St. Louis, Ill. MEN—I8 Up. $1.700 to $2.700 year carriers, railway postal clerks Steady— po- sitions. Vacations. Sample coaching free Write immediately. Franklin Institute, Dept. D3, Rochester, N. Y. Mail SECTION FREE ip-shade Instruction by mail I painting; glass, china pa photo painting; gesso polochrome; art | lay modeling; gilding-bronzin oi pastel painting; furniture decorating ror silvering, picture frame wood carving, tools, et Write for t Chicago Art Carving Co., P. O. Box js59 INVESTIGATING And Tracing Work home or. travel Experience unne Write George Wagner, 2188 Broadw N.Y MEN Wanted for go D $1,700 to $2,700 per year. Particula Wm. L. Jones, 215 Fairfield Ave “ WANTED s0y men sSecome a chanics. Sample training free. Frank stitute, Dept. D400, Rochester, N. Y ADVANCEMENT! Prosperity f College grade _ practical business through correspondence Director, pr executive, graduate three world-wide sities Write Saunders, 509% Fifth New York. ~ WORLD-ROMIC languages Arabic, ¢ French, German, Italian, Japanese, R Spanish. Languages, 15 W. 18th St York ernment stem, Masterke *rimers, $1.98; a Ss GOVERNMENT wants mer $1,700-$1,900 and up at start Railway Mail clerk examination coming t expert (former Government examiner pare you for this and also Rural Car Post Office, Customs, Internal Rev other branches. Write today for f let. Dept. 8 Patterson School, Rh N. Y¥ LIKE To draw? Will enlarge pictures. Hockanum, Conn STUDY A’ Scientific tion—Bacteriology— Microbiology Ext Residential courses Diplomas—! granted Urinalysis outfit and free. Int. College of Microbiology, 722 ‘ umet Ave., Hammond, Ind DOUBLE Entry Bookkeeping masters 60 hours with 8 keys; guaranteed mas International Bookkeeping Instit Dept. 8. Springfield, Mo WANT U. 8S. Government Posit mence $100 to $250 month? Mer ‘ Send Joc for pant Lilley, Box 20s, Profession. 18-55, trained at home in three Write, Ozment Instruction Bureau, 101, § Louis, Mo TRACE Missing People Exce ing work Open to all Writ Headquarters, 169 East 83rd Street, New York ra a USED educational matter sold on re purchase asis. Also rented and ex changed Money-back guarantee Catalog free. (Books, etc. bought.) Lee Mot Pisgah, Ala 2 ENGINEER Teaches Arithmetic, A Geometry, Trigonometry, Drafting, § ing, Aviation. Mondell, 1440 Broadway New York DON’T Prepare for any Civil § : amination without seeing our ¢ log. 1! Columbian Correspondence College, W ington, D. C STUDY Mechanical Dentistry and earr to $125 per week Learn at home in s time to make crowns, inlay etc Vv for information Modern Dental Inst 49 South Main St., Salt Lake City, | SELF-IMPROVEMENT System, most 4 vanced, lowest cost Work wonder 1 versal League, Times Building, New Y YOU Need a better grip on mathen Tell us to send you a copy of “‘Mathv for the Practical Man,’’ only $1.5) common sense methods it removes the n and difficulties so algebra and calcu made simple Assuming your knowled limited to arithmetic you quickly and € gain a working knowledge of algebra, g¢ etry, trigonometry and calculus Si pay postman when he hands you the Age Address Popular Mechanics P Room 894, 200 E. Ontario St., Chicago, | RADIO OUTFITS AND SUPPLIES BE The licensed radio doctor in your ¢« munity $7-$10 spare time evenin 0 co-operative plan secures all the work want Secure franchised territor Li Write for booklet Co-Operative FR Doctors, Dept. M, 131 Essex St., § Mass.

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POPULAR TUnE Sets in massive walnut cabinets, henry chokes, $1.00; 2 microfarad blocks, $.60; Stepup transformers, ee cireuit tuners, $1.75; Saal its, $1.75; sockets all types, $.25; ie tuners, $.75; also suitable for Crystal detectors, $.45. Every unteed or money refunded. Chas. Co., 4240 Lincoln Ave., Chicago, rs in bankrupt stocks. Lo Speaker reception from any crystal . our microphone button. With in- ssc. Portable radio $2.00 each. ) Laboratories, 1213 West Third town, N ait EY Radio Pups. $2.75 new. Also igar lighters, two-year guarantee, Pay postman. General Distributing Security Storage Building, Duluth, TRADE AND TECHNICAL SCHOOLS Writ A foreman’s job? You may be echanic but if you can’t read blue- ou haven’t a chance. I train you Write me your trade. Carroll 266 Drexel Building, Philadelphia. TELEGRAPHY—Both Morse and Wireless taught thoroughly and quickly. Tremen- and. Big salaries. Wonderful op- es. Expenses low; chance to earn s che ol established fifty zonrs. Catalog Dodge’s Institute, Fern St., Valparaiso, WANT WE Train you for commercial radio — ! ind junior engineering, pissing os in positions paying $15 $305 from : start. Rapid advancement. e for catalog of course including extension rse Loomis Radio College, Dept. 5-E, gton, D. C. BUSINESS OPPORTUNITIES Ne WAIL-ORDER Business is y READ The Mail Order News—America’s neer Mail Trade Journal. Quarter Cen- » Old. Approximately 600 pages yearly of information for beginners and es- i mail-order houses. Analyzes mail- usiness, its opportunities. Practica- \il-order ideas, legitimate money-mak- emes, instructive articles. Tells how what to sell. Published monthly. sription $3.00 yearly. Send 25c¢ for r copy. None free. Mail Order News, ) Bristol Bldg., New York. a $i PAYS $20—I start you t big money business. You supply and agents with new sure-fire sell- eclalties. Write immediately for eye- literature, describing guaranteed latest valuable trade processes. lines Small investment. Immense Start anywhere. Miller, Chemist, 1) Jetton, Tampa, Fila. your oppor- Breniser’s famous handbooks, for years have shown beginnners prac- how to get into this fascinating and ible business. Continually revised, up to date. Set of ten, $3. One nd descriptive catalog 25¢. None free. er Publisher, hia HEMICAL Expert will furnish formulas i trade secrets. All lines Lists free. L. Cummings, Ph. D., 228 Gordon Ave., r e N. ¥ KETIRED Manufacturer offers private a with complete instructions for man- 1607 P, Sansom, Phil- iring household vanilla flavor. Big Used in every home. Unusual profits. achinery required. Write Freeman ts Corporation, New Haven, Conn. START A big paying business. Small ital. Details for Burn- stamp. Roy ‘it Lockport, _ ee M Making 75 to hundred month making n products; why not you? 24 money- formulas, 50c¢ (coin, no stamps). rd Cineiolo, Gainesvillle, Ga. Pay three dollars each for money-mak- ideas acceptable for our publication. r “Novelties and Specialties you can ind sell at home,’ 25 cents. Ideas hing Co., Box 6068, Kansas City, Mo. HOW To raise capital; my service is for ’ who require money for business proj- f merit, and is fully explained in my ‘Corporations & Finance’’ sent on re- t W. Harrison Cole, 509 Sth Ave., York. MECHANICS ADVERTISING SECTION 53 ANYONE Handy with paint brush can earn five thousand dollars or more yearly installing Waltex—a beautiful plastic paint of many shades and textures. Waltex is in- stalled in homes or buildings where beau- tifvl appearances are desirable. Sells on sight. Get full particulars. Everlastone Products Corp., Everlastone Square, Balti- more, Md. ARTIFICIAL Marble sanitary flooring in- structions, covering wood or cement flooring % inch thick, fireproof, waterproof, all col- ors, low cost. Ornamental casting, concrete, plaster, papler-mache decorations, garden furniture, statuary, flexible molds. 18 years instructing the public; particulars and illus- seations free. Chris. Mahier, Huntington, ig directory where to buy half million articles wholesale, copy $1.00. Particulars free. Miller Mfg. Co., De Land, Fla. BECOME A Heating Engineer. Increase your means from year to year. We tell you how to start right in and land the =) sf might have been. 11 Cross, Newport, N _H DO You want to earn five thousand dollars or more installing Everlastone incinerators? Burns up all garbage, waste, sweepings, etc. Installed at extremely low price in all homes and apartments. Get full particulars. Ever- lastone Products Corp., Baltimore, Md. 185 MANUFACTURERS, Exporters—Ger- many, China, Japan, ete. (ten countries). pe classified list $1.00. C. Alexander, 4725 Sheridan, Chicago. ing and selling automobile seat covers. teach you and furnish materials at cost. Seat Cover Shop, 2419 W. Angeles. THE Latest, most amazing products! 200% to 500% profit! Make them yourself. Write for free, valuable literature. Scheld, Chem- ist, Box 1199, New Haven, Conn. se GENERAL Repair shop. Good locality. The 9th St., Los Must sell. Sickness. $2,000.00 down. Bal- ance like rent. H. Armstrong, Delhi, Calif. “LET Me guide you to big pay. Com- plete library of over 100 successful business plans 10c. Write today. H. C. Stanton, 32 New St., Binghamton, N. Y. CHARTERS: Delaware; best, cheapest; free forms. Colonial Charter Co., Wilming- ton, Del. “PONT Sell for others. Employ a yourself. Make your own products. articles, household specialties, ete. 500% profit. Valuable booklet free. National Scientific Laboratories, 1984W Broad, Rich- mond, Va. MIRRORS Resilvered at home. Costs less 5 cents per square foot; you charge 75 cents. Imuiense profits plating like new, brassy, worn-off autoparts, reflectors, tableware, stoves, etc. Outfits furnished; details free. Sprinkle, Plater, 127, Marion, Ind. PROMOTER Wanted for fuelless electro magnetic motor. Mr. C. Patock, 3234 Pierce Ave., Chicago, Til SMALL Capital starts profitable chewing- gum machine business. Particulars free. Chewit Company, 28J Dodworth St., Brook- lyn, N. Y. MAKE Furniture polish. Big demand Formula 50c. AHO, 407 Morristown, Minn. agents Toilet UNPATENTED Ideas can be sold. T tell you how and help you make the sale. Free particulars (Copyrighted). Write W. T. a 810 Baltic Building, Washington, Cc. “SCHEMER™” Subscribers; surely suc- ceed. One reports $50,000 from one tip; another $25,000 from three Schemes; an- other $10,000 from one formula. Try your luck! Year, $1.00; three months, 30c. Pat- terson, Publisher, Alliance, Ohio. SUPERIOR Formula and complete manu- facturing information for automobile and radio batteries. Real business opportunity. Particulars free. Moline Laboratories, Mo- line, Ill. ~—GAPITAL—An_ experienced, dependable broker with following will aid in financing worthwhile project. Address B. W., 810 Broad St., Newark, N. J. oe ~T MADE $30 a Week Home. French Rreadmaking. 15 years’ experience; Free Booklet tells. Ashbrook 67, Marengo, Ohio. PATENTS. Time counts in applying for patents. Don’t risk dalay in protecting your ideas. Send sketch or model for instruc- tion or write for free book “‘How to Obtain a Patent’’ and “‘Record of Invention” form. No charge for information on how to pro- ceed. Communications strictly confidential. Prompt, careful, efficient service. Clarence A. O’Brien, Registered Patent Attorney, Se- curity Bank Building (directly across street from Patent Office), Washington, D. C. See pages 140 and 141. WITH $50 Equipment you can have busl- ness of your own; no selling or repairing ex- perience required. Render service every auto- ist is glad to pay for. Boy can operate. Write Motor X-Ray Co., 1095 Market St., San Francisco, Calif. INCOME Increaser—Newly enlarged J6- page monthly magazine of best, latest ideas, plans, schemes, tips, pointers, starters. One year, $1.00. Three months, 25c. Income In- creaser, 63P Court, Boston, Mass. MAKE Money with small mail order busi- ness of your own. New book tells how. De- scriptive folder free. Reider Sales Service, Ashland, Ohio. “NO Peddling. Start own business. Home, office. Free folder describes 27 money making opportunities. No outfits. Elite Co., 38 Elizabeth SS 2 SUPPLIES For making chipped glass house numbers and signs. Tinfoils, glass and frames. Osborne Sims, 13580 Tuller, Detroit, Mich. START A Crispette shop. Delightful con- fections. Everybody likes them. Make a lot of money. Adams reports $364 profits in two days. We start you. Write, Long Eakins, 1962 High St., Springfield, Ohio. (Samples _10¢. ) i SIGNS And Showcards easily painted with letter patterns. Large variety of styles and sizes. Samples for stamp. John Rahn, a2120 Neva Ave., Chicago. “BUSINESS Profession of your own and earn big income in service fees. See Steph- enson Laboratories, display ad. page 130. MECHANICS, Painters, carpenters, start furniture refinishing, painting, handyman shop on nearly nothing ; winning plan brings customers quickly. John Braceland, 1439 So. Ninth, , Philadelphia, Pa. MAKE Big Profits with a Fur Farm in your backyard. Chinchilla Rabbits, Musk- rat, Mink. Write for facts. 252 Conrad's Ranch, Denver, Colo. WE Start You in ~ Business, furnishing everything; men and women, $30.00 to $100.00 weekly operating our “New Sys- tem Specialty Candy Factories” anywhere. Orportunity lifetime; booklet free. W. peuiyes Ragsdale, Drawer 4, East Orange, SUCCEED With Your Own Products. Make them yourself. Formulas, Processes, Trade-Secrets. All lines. Catalog, circulars free. B. Thaxly Co., Washington, D. C. “LEARN the collection business. Good in- come, quick results. Interesting booklet, “Skillful Collecting” free. National Collec- tors Assn., Long St., Newark, Ohio. “RUILD your own business selling Annie Blain Flavors. New Repeat System. Geo. S. Parker, New Brunswick, SELL By Mail. Particulars free Room Wonderful “opportunity. Mason, 3902 Broadway, National | Cutlery, Sta. v. Los "Angeles, Calif. BECOME Indepe ndent. Start a Mailing Service Business with almost no capital. 1 cleared $5,000 last year. Write for par- ticulars. Keystone Mailing Bureau, Box 1032, Altoona, Pa. KING System Mail Order Business, King Company, Box sample, details free. 6722, Wilmington, Del. __ ee ie UNLIMITED Opportunities and mail or- der information Advance Company. Stillwater, N. SELL by Mail! Books, novelties, bar- gains! Large profits! Particulars Free! B-Elfco, 525 South . Chicago. BIG Bunch Mail. Year 15¢. Catalogues, Magazines. Kentucky Agency, Covington, Kentucky ATTENTION Establish for yourself new system real estate, brokerage and insurance agency; office at home; earn $5,000 year. Stamp free booklet. Hayes Realty Associa- tion, Cincinnati, Ohio.

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POPULAR on f of ground No stamp Geo AN Income from an acre ginseng raising Particulars, L. Brockman, LaPorte, Ind

“CIRCULAR Free Learn how to sell nov- elties by mail under my instruction Had- wil, 96A, 74 Cortlandt St., New York A BUSINESS of Your Own Making Sparkling Glass Name and Number plates Checkerboards, Signs Big book and sam- ple free E. Palmer, 540, Wooster, Ohio. TELEGRAPHY TELEGRAPHY—Both Morse and wireless —taught thoroughly and quickly Tremen- dous demand. Big salaries. Wonderful op- portunities Expenses low; chance to earn part School established fifty years Cata- log free Dodge’s Institute, H St., Valpa- raiso, Ind

CHEMISTRY YOUR Chemical problems solved and work-

ing formula or proce furnished for $5.00 Write me W. Stedman Richard, Industrial Chemist, Box 2402, Boston, Mass CHEMICALS And apparatus. Price list he George Ott, 1218 Chestnut, Reading, Penna

FORMULAS AND TRADE SECRETS ATTENTION! New

Attention! superfine, late, scientific, non-alcoholic lemon, orange, lime, maple and vanilla flavors These are not gummy emulsions Will not deteriorate Easily ade No machinery required. Im- prove with age Formulas for all with com- plete information $10.00 Any one flavor complete $3.00 each Samples of these flavors made with same formulas will be sent for 25c W. & E. Specialty Laboratory, 1067 Broadway, Buffalo, N ‘

LATEST Valuable trade secrets, guaran- teed formulas for starting world’s fastest big money business making newest sure- fire specialties All lines, small investment Immense profits! Write immediately for eye-opening valuable literature Miller, Chemist, 1706-E Jetton, Tampa, Fla LATEST Book of money making and opportunities $1.00 No trash. Scheiderer, Plain City, Ohio ~~ MANUFACTURING Tdeas made practical. formulas August

Chemical consultation and analysis. Money- making formulas. Charges moderate. Write Associated Chemists, Indianapolis, Ind MAKE And sell puncture stopper. Stops punctures without removing tube from tire Easy to make, big profits Formula $5.00 R. E. Matthews, Sherman, Tex EXPERT Chemical analysis and consulta- tion at low cost. F Stenton Laboratories, adelphia, Pa and processes $1 sriffith St., Phil-

DON’T Sell for others Employ agents yourself Make your own products. Toilet article household specialties, etc 500% profit Valuable booklet free National Scientific Laboratori 1984W Broad, Rich- mond Va SUCCEED With Your Own Products, Make them yourself. Formulas, Processes, Trade-Secrets, All lines. Catalog, circulars free. B. Thaxly Co., Washington, D. C. INDUSTRIAL Chemist furnishes formulas plans trade secrets All lines Work guaranteed Lists free J. F. Mazur, 941 20th. Lorain, Ohi ~~ FORMULAS—170 Money makers and big illustrated catalog 20c. Ideal Book Shop, (K) Park Ridge, Il AGENTS WANTED

AGENTS—I'll pay your bills, give you steady in e for rest of your life, if you will take my business in your lo- cality or spare time You be my partner, make $15 a day, ride in Chrysler Distribute coffees things people eat I furnish ev super sales outfit con- sedan teas ex- tracts

thing: world’s finest taining thirty-two full-sized packages: low prices; big repeat business; $25,000 guar- antee on quality I go 50-50 with you Get my amazing offer Cc. W. Van De Mark, Dept. 102-F, 117 Duane S8t., Cin- cinnati, Ohio “CEE-DAR Kills moths. chases flies. mos- quitoes, cackroaches New form No pow- der or liquid. Hangs on hook. Guaranteed Repeater Women buy one to six Parti ulars free Sample loc Cee-Dar, D777 W

Washington, Chicago MECHANICS ADVERTISING SECTION $40 PROFIT The first day! That’s what Murphy did with the new Perfo-Siphon, the fastest selling novelty of the year. Sells on sight to everyone using ginger ale or any carbonated drink Makes a siphon of every bottle. Slipped on right over crown cap it perforates it Keeps contents full of like it! $1.50 or ask for full Mfg. Co., Dept Chicago for days seller. Mail $1 for sample, details. Vaughan Novelty A-135, 3213 Carroll Ave sparkle Nothing

“RIDE AIR” Men made $375,952.00 in- troducing this world-beating money maker the last 2 seasons If you are not afraid to work 2 to 4 hours a day, I'll prove that $20 a day profit will be easy for you No selling experience necessary. Sample free and I mean just that! No strings to this offer—not a cent now or ever for the sample and full particulars. Address C. F. Hamil- ton, Dept. 15, No. 532 W. 27th St., Los Angeles, Calif 100 MORE Active men to introduce ‘‘Chief- tain’’ guaranteed tailored shirts, 3 for $4.95 Latest novelties, colors, styles. Dickman, Illi- nois, in 3 weeks made $589; Sinton, Texas, in 12 days, $219.60; $334.80. Why capital needed Bend, Iowa, in 16 days not you? No experience or We deliver and Full ollect working outfit free. Cincinnati Shirt Com- pany, Shop 1586, Cincinnati, Ohio AGENTS Fixit Rubber Repair is the wonder of the age. It is semi-liquid, chem- ically prepared pure up-river Para Rub- ber. Applied cold, without heat or tools, it quickly vulcanizes itself to tube or casing Repairs punctures or blowouts. Agents make big money—best season now. Auto owners, garages, service stations, fleet owners will welcome the opportunity of sav- ing 800% on tire repairs and of increasing mileage of their tubes and casings. Send $1.00 for full size sample or write for free particulars. Marquette Rubber Co., 2325H Wolfram St., Chicago. _ DRINKS, The best you ever tasted, con- centrated true fruit flavors, cherry raspberry, strawberry, grape, etc. Just add water and sugar. Can be kept on ice for a week. 30 quarts (150 glass size) $1.00; 3 for $2.50 postpaid 80c clear profit on every dollar selling at ‘Se a glass—beautiful signs free Also 10c packages soft drink powders, makes 10 big glasses delicious drinks Big sellers to families and stores. Seven packages, as- sorted flavors (70 glasses), with full partic- ulars, 50c postpaid. Chas E Morrissey Co., 4417 Madison St., Chicago PRIVATE Brand toilet articles, house- hold specialties, perfumes, soaps, extracts, et We pack these goods for you under your private label. With your name on the goods you can get all the repeat business Don't sell for others, but build up profitable business for yourself Highest quality merchandise Extremely low prices. Quick shipments. on both large and small orders. Write immedi- ately for lowest wholesale plete information offer. Address, Scientific Laboratories, mond, Va prices regarding our azing Supply Department, National 1904W Broad, Rich-

WANTED! Ambitious, industrious person to introduce and supply the demand for Rawleigh Household Products. Good open ings near you. Make sales of $150 to $600 & month or more. Rawleigh Methods get business everywhere. No selling experience needed. We supply Sales and Advertising Literature and Service Methods—everything you need Profits increase every month. Low prices; good values; complete service W. T. Rawleigh Co., Dept. 63PPM, Free- port, Ill AGENTS: Large profits selling our eighteen making specialties including pat- All-In-One combined cigarette and Holds package cigarettes and box money ented match case

safety matches teautiful, compact, flexible container. Write today for complete informa- tion. All-In-One, Dept. A-6, 2810 Portland Ave., Minneapolis, Minn AGENTS: Make two dollars hourly Sell new kind of sharpeners Sharpens all knives, tools quickly Demonstrating sar ple free. Premier Mfg. Company, Dept. 68, Detroit, Mich JUST Out—New Patented Apron No strings or stran $20.00 a over 100% profit: commissions for free offer Sta-Put Co Louis, Mo.

AGENTS—Best seller; Jem Rubber Repg for tires and tubes; supercedes yulca at a saving of over 800 per cent; put i . old, it vuleanizes itself in two minut and ‘ is is guaranteed to last the life of t =i me tube; to every auto owner and ory dealer. For particulars how t big money and free sample, address A Rubber Co., Philadelphia, Pa De EARN $15 Day selling No Touch &

Forks; women buy on sight. Parti ad or $1 for sample. Du Pree Co., 608 | Bldg., San Francise NEW Invention—400° profit I ; quick mend for fabrics and hosiery Stons runs Every woman buys » fast sellers J. E. Johnson 6129 Wentworth Ave., Chicago ~WOMEN—$2 An hour spare tim commission; new idea nitar r sell on sight; every woman t feature never before used: de ned sician; revolutionizes old uncomfortat ods; 1 every day; no deliverie r tions; no experience or capital r Write Mary P. Coleman, Meride ( AGENTS— Distributor Whirlwir r Gas tation deal . driver Mir windshield cloth One wiping defies r i hour lazing results Retails 5 ) Chemical i7th & Washingt I Ohi AUTOS Washed without water: me d cloth removes mud without ing; 250,000 sold by ag ts; re Security Mfg. ¢ Dept. 25, Toledo, O AGENTS—RBig profits selling candy specialties. Colonial Co., 312 } New York SELL Grip-It rewdriver H . w until it is 1. Send 50c for - and proposition try it ir r our profit 100% ex Stamping ( R erdale Station, Chicag Til BIG Money selling Sez ibbe Sealair Rubber Co., Five Hundrs I e. New York “WE Want more good salesmen f r men’s neckwear and h r arer. Big Vaiues 9 | sample order C. O. D G Radiant Neckwear

( 1879-B Southern Boulevard, Ne specialty that sells on holder fills every need f or shrubbery ideal for su er prot ory; no mone W liate for particulars before tl gets under way i

tion for le line Grewer Prod ( Port ] B n. Mass MAKE $11.00 Dai ir our la toilet good rt t at $2.2 = piece r et Each sale

( € is Household Prod 12 M cr ig SPINNING Red white light colors for cowl See e ! f ! Get i ' rr nd fi r AGENTS Cre en Make i Handling ur Mysti Zi § prot on a napp ( “G ¢ article’ sell n 10-second le Perfor while you watch it De value while others make clair G scientific triumph of the age Wri diately for proposition! Kara Ss pany, 606 Bozan St Fort Wayne, I “~AGENTS—Sell new auto spri tached instant! any 1! I riding comfort—tire mi ‘ breakage Over 100 i Supply Company, Dept ( GENUINE--Dupont Fabrikoid T h like oilcloth 1 $75.00 weekl Ia Doilette Corporati Stop hosiery rur é al imazing needie re-knit like new: ever woman buys arr in pocket; working sample offer N Needle (< 19 S. Wells. Chicag AGENTS Send for free sample “‘Tretr Washes clothes snow white without 1 5.00 aily and more easily made tr given Empire, 1549 N, Wells, Dept Chicago

Page 235

Repair iZation . it on $s, and Ure or acces. make ‘mazon 505, erving rs free Pacific Liquid Stops other 466, 100% essity; , New phy- meth- collec- juired, onn. seller. ; ir direct Write is re- ring POPULAR MECHANICS ADVERTISING SECTION 55 \GENTS—$13.80 Daily in advance, intro- » insured hosiery for men, women, Must wear or replaced free. 57 ) colors including latest “Silk to ladies’ hose. Nyland made $595 jonth. Edwards, $460.60. Mrs. Bone 25.45. Why not you? Even spare ; id pay you $3.00 an hour. No ex- - needed. We furnish samples. Silk foun f your own use free. New plan. ducing Writ Lick. Macochee Company, Park a5 innatl, Ohio. “Fi Ys $20—Start the world’s fastest . making business. Make and gents, salesmen with new sure-fire pecialties. Write immediately for literature, describing guaran- las, latest valuable trade processes, Small investment. Immense profits! where. Miller, Chemist, 1706K, Tampa, Fla. Mi You cannot sharpen a razor blade wit! ning it. “Zip’’ Safety Razor Str ; hone and strop in one operation. N iple; automatic master stroke; pos- { f Superior to all other stroppers; sts lifetime. Retails $2.50. Write for free off Commissions daily. ‘*Zip’’ Inc., 4|3 b. Stark St., Dept. M, Portland, Oreg. “No Peddling. Start own business. Home, ofice. Free folder describes 27 money mak- ing rtunities. No outfits. Elite Co., 3 I beth St., New York. —{ RELIABLE firm wants few more lively agent Brilliant proposition that will help 1 nvert your spare time into money. We furnish sample. Write for particulars. Tampa Habana Industrial Co., Box 5147, Fla. AGI NTS—Just out. Whisper your talk over telephone. 100% profit. Every tele- phone a customer. Immediate sales on dem- onstration. Sample one dollar. Whisper Phone, Long I Island ( C ity, N. Y. AGENTS: Wanted for imported novelty pocket knife used as cigar cutter, twine cutter, nail cleaner, manicuring, ete. Sells easy for 50 cents each. Cost you $2.00 per dozer Send 25 cents for sample. New Trar t, 464 West st 23rd St., New York. No less. MEN _Women, $1.80 an hour. arge Mfg. Co., established 30 years, Start- ew medallion dept. Amazing new sales First 22 agents average $1.80 an hour stea Only 1 agent wanted in locality. Your own photo free as sample. Art Me- lailion Co., Dept. 77, Corner Campbell and Jack Chicago, TI. “AGENTS — Something new. $75-$200 weekly selling $7.50 washing machine. Does work of high-priced machines. Biggest profit We deliver—collect. Free sample fer (Weight 4% pounds.) Act. Merle Mfg. Co., (Manufacturers), Desk 4C, Aurora, Can't resist buying New patented self-wringing We prove it’s the biggest money- maker and the best mop made by sending on approval. Kleanezy, Dept. G-20, s, Ohio. STRANGE Invention! Pays $25 daily; telephone and iron cords from tan- giing and kinking. Prevents iron scorching. Saves electricity. Sample free. Neverknot, Dept 6-A, 4503 Ravenswood, Chicago. Tio SEWIVES ‘ ” Nieane7V, Delp! FL \VORING Extracts—Bottle yourself! Concentrated, add water. Free labels, whirl- wind sellers! 500% profit! Moneymaking opportunity. Write Thomas Manufacturing c iny, Indianapolis, Ind. DON’T Sell for others, Employ agents rself. Make your own products. Toilet articles, household specialties, etc. 500% profit Valuable booklet free. National Scientifie Laboratories, 1984W Broad, Rich- mond, Va. BIG Pay every day! Complete guaran- ! line direct to wearer, dress shirts, work shirt overalls, coveralls, work pants, un- , sweaters, playsuits. $10-$15 daily. ience unnecessary. Big outfit free! od Co., Dept. 8, 4922-28 Lincoln Ave., MAKE Money—Spare time. ANY Salesman can earn $75.00 to $200.00 a week selling our patented real art genuine gold leaf window letters. No experience nec- essary. Sell on sight. Big demand all year round. Any one can put them on. Buy for cash and sell for huge profit. General agents can collect big commission on original and repeat business. Free liberal samples. Write today for complete proposition. The Tablet & Ticket Co., 1015-1021 West Adams St., Chicago, Ill. AGENTS $240 Month. Sell finest Tine silk hosiery you ever saw. Auto given when earned. Free silk. hosiery for your own use. Write today for samples and state size of hose worn. Betterknit Textile Co., Silk, 2631, Greenfield, Ohio. AGENTS ante - weekly. New patented ironing board covers. Other fast selling novelties. Samples free. American Braiding Company, W. Monroe, Dept. K, Chicago. Men, women, boys, girls. Easiest method; absolutely something different. No selling; no can- vassing. Free particulars. Federal, 561 AA Broadway, New a “AGENTS Make big Sell magnetio run and patch needa? "aes. ‘straight needle. Every woman buys. Wonderful samples sent. Diamond Specialty Co., Dept. C, 5851 Went- worth, Chicago. $15 A DAY Sure. Sell guaranteed solid leather shoes. Unequaled low prices. 85 styles; men’s, women’s, children’s. Free outfit offers complete line shoes, rainccats, leather coats, puttees. Consolidated Shoe System, Dept. 615, Eau Claire, Wis. “IF We send you two of our newest inven- tions—Wringer and Dust Mop—will you demonstrate and take orders? Every house- wife eager prospect. Pays $75 weekly. No money required—samples loaned free. Write Delphos Mop Co., 1016 Washingtcn, Del- phos, Ohio. ~“FHE Christensen Mop Wringer rubs, scrubs, cleans the mop. For sale by H. K. Christensen, Fort Atkinson, Wis. WHY Sell Non-Essentials? Home neces- sities repeat. Duo Double Strength Ex- tracts, toilet articles, full line of special- ties, can’t be beat. Big profits. Write quick. Duoform Co., N-1, Attica, N. Y. AGENTS: Make $5. 00 an hour taking or- ders for our 40 fascinating kitchen special- ties. No competition. Write quick. Gen- eral Products Co., Dept. F207, Newark, N. J. COME To work with us—New spring out- fit ready. Our agents make $15 daily sell- ing shirts, underwear, sweaters, raincoats, boys’ suits, hosiery. Northern Sales, 101 S. Wells, Chicago. $75.00 WEEKLY Demonstrating and dis- tributing Rich’s soft drink powders to homes and stores. Southern agents selling 30,000 monthly. Wonderful apportunity. Sample free. Sol G. Bich Co., 622 8S. Sangamon, Chicago. AGENTS Wanted—Make $250 weekly sel!- ing rare quality products to homes or stores. Big demand; repeaters—profits. For details send us your address. Continental, 47-G West 45th St., New York. DISTRIBUTORS—Sf Page wholesale sup- ply source. Directory offers unlimited op- portunities. Pruitt System, Brookfield, [il AGENTS—Men and women now earning $75 a week with Hoyt’s foods, soaps, toilet- ries, necessities. Nobody n experience. Our plan is different. Insure a big, steady income. Join us. Ask for free sample case offer today. Hoyt Bros., Inc., Dept. 92, Newark, SELL Supreme No-Cement tube and tire patches. 310% profit. Particulars. Write Supreme, 135 Winder, Detroit, Mich. RE-NU-A-TIE Tie tree. Removes wrin- kles, keeps ties like new. Automatic, in- stantly adjustable any size. Agents’ prop- osition, sample 25 cents. Re-Nu-A-Tie, 9 Newbury 8t., Boston, Mass. AGENTS And salesmen wanted, easy mak- ing $15.00 daily and how, selling men’s imperfect hosiery and neckwear, everybody needs; cost $13.20 gross pairs $15.00, $22.20, $24.00, $27.00; neckwear $7.20 gross $12.00; send today $10.00 for 7 doz. assorted sam- ples. Very good opportunity. Lewis Hosiery Co., 12 N. 3rd St., Philadelphia, Pa. AGENTS—150% Profit selling the Hel O Pad. Just out, the fastest selling speci- alty on the market. Every telephone a prospect. Send $1.00 today for sample and complete information. The Hel O Pad Co., Dept. P, Cumberland, Md. ANTI-GLARE Headlight attachment. Takes glare out of headlights. Makes night driving safe. Increases light efficiency. Agents wanted. Retails $1.50 per pair. Anti-Glare Attachment Co., Box 97, Sa- pulpa, Okla. FREE ‘“‘Guide to a full pocketbook.”” New ideas, original business plans, money mak- ing secrets, other valuable information Elite Co., 38 Elizabeth St., New _ York. ~ GENUI INE Proposition for serious workers. Changeable signs sell readily to store- keepers. $1.50 size costs you 35e-50c. Two samples $1.00 postpaid. Also embossed show- cards. Catalog. Free sample. Changeable Sign Co., 379 Logan St., Brooklyn, N. Y. ATTRACTIVE Auto cablems, embossed, engraved; never tarnish. Belle Mfg. Co., 96 Friendship, Providence. ~~AGENTS, 80c¢ Profit per dollar. French toilet preparations, food products. Particu- lars free. Rene Products Co., 137 Broad- way, Chicopee Falls, Mass. NAM-0-LENE—New, _self-selling auto wonder—300%—Prepaid—Free sample. Dia- mond Spear, Texarkana, Ark. “BARGAIN Lots of chemical specialties for less than production cost. Big profits, list free. Peoples Chemical Laboratory, 2519 So. Crawford Ave., Chicago, Til. GENTS Felecia Cigar Lighter. 1] ented lighter on market. Clean up $50.00 daily. Sample $1.00. Hamburg Import Company, 27 West 33rd 8t., New York. QUARTER Sellers. Every housewife, auto- mobilist buys. Quick demonstrations. Big profits. Write. Home Appliance Company, Ellisburg, N. Y. AGENTS—Make $20 daily. Wonderful article. Amazing new profit opportunity. Women buy quickly. Orders repeat. We deliver and collect. Write quickly. Knights Mfg. Co., 37 Hamilton Blvd., Buffalo, N. Y. ENGRAVED Nameplates, signs, numbers, initial, desk, city nameplates. Big profits. Hilton Specialty, 90 Stewart, Providence, » & Best pat- NEW! Patented automobile washing mop; tubular handle; attaches any hose; no splash- ing. Enormous demand. No competition. Amazing proposition. Federal Specialties Co., 1325 Sheridan Ave., Pittsburg, Pa. ~ ‘MED. Agents—Everybody is - MED ALI LION prospect for photo medallions, jewelry, com- pacts, mirrors, photo novelties, etc. Make bigger profits; full time or sideline. Write at once for catalog and plans. Medallion Novelty Co., 208 Bowery, New York, Dept. $5,000 A YEAR—Selling Perry Photo Me- dallions. Big demand. Ready sales. 400% to 600% profits. Any photo copied perfectly on medallions, mirrors, compacts, jewelry, etc. Guaranteed likeness. Investigate. Free catalog, full detafls on request. Write to- day. PM. Perry Photo Novelty Corp., 1793 Jerome | Ave., New York. AGENTS —$240 Month—Biggest line guar- anteed cutlery ever offered. Knives, razors, ete. Exclusive territory. Extra commission. Big money for spare time. Write quick. Novelty Cutlery Co., Desk 1831, Canton, Ohio. WELLS Cleared $620.00 in one month with “‘Business Guide’’ and free legal serv- ice. Write for free outfit. Prof. Nichols, Dept. 8, Naperville, Til. THE Latest, most amazing products! 200% to 500% profit! Make them yourself. Write for free, valuable literature. Scheld, Chem- ist, Box 1199, New Haven, Conn. AGENTS $240 Month. Dri-Kleanit re- moves dirt, grease, tar, all one operation. Cleans car for 10c. No soap or water used. Car looks like new. Wonderful seller. Free sample. American Accessories Co., Desk -51, Cincinnati, Ohio. CATHOLIC Representative wanted in every city and town in the country to take orders for brand new novelty which has di- rect appeal to every Catholic heart. Calnan — 27 Haymarket Square, Boston, lass. MIRRORS Resilvered at home. Costs less 5 cents per square foot; you charge 75 cents. Immense profits plating autoparts, reflectors, tableware, stoves, refinishing metalware, etc. Outfits furnished. Details free. Write Sprinkle, Plater, 128, Marion, Ind.

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56 POPULAR MECHANICS ADVERTISING SECTION

WHY Not sell us your spare time? $2.00 NO Dull times selling food. People must ENERGETIC Salespe ple. Ne an hour, 9.70 daily easy full time. In- eat Federal distributors make big mon« : hold device softens, filter water troduce 12 months guaranteed hosiery 47 $3,000 yearly and up No capital or experi- easy Aluminum doughnut t ike . tyles ¥Y colors for men, women, children, ence needed; guaranteed sales; unsold goods seller. Samples $2.00 each. Resear including latest Silk to the Top’’ ladies’ may be returned. We furnish you with sam- ratories, Savage, Minr hose and men’s fancies No capital or ex- ple case, license and free sa nples for cus- CASH P Tor Fhutt ; Rae : . . - : ; aid for Butterflie I perience needed. We furnish samples. Silk tomers—Sure repeat orders. Exclusive terri- Sinclair Display Advert t hose for your own use free New plan tory Ask now! Federal Pure Food Co., - Bl WNPSa +7 = Milton Mathews, Park 5866, Cincinnati, A2307 Archer, Chicago - AB INESS of your ow M Ohio - SEPUmoG 5 . irig glass name and number I h AGENTS $240 Month Bonus besides erboards signs. Big book 1 MAKE Big money selling tires, all or Sell finest line silk hosiery you ever saw E. Palmer 512 We neg oO} mart time Handsome profits; sell your Producers earn auto. Credit given. Write ) Si % NDs 7 friends; buy your own tires and save the for samples Wilknit Hosiery € Dept mn AR yne 8 Cor lete re riddleman’s profit Cruaranteed 15,000 1831, Greenfield, Ohio “tr _ with —— Qui = \ ! Write at once territors i] ae . ool Sol ingly > three « ane . Write ¢ ' ( f r rritory - 1 full AGENTS: Liberal commissions and bonuses $100 Andersor Mont old 1 Ir + Acme Supply Company, Lafayette, selling high quality hosiery, handkerchief weeks. Get details for yr men’s ties . a raster “ ° 7 betas sa - 3 a x linens. Also's Dig fing ee, .cecspreads, | vest time now. M. Morey ier , Colored embossed signs linens Also a big line of dress goods, silks falo, N. ¥ wi ike | ney for you 00% profit etc 1,000 samples furnished Write Y ENTS — r Ever-Ready, 52-A, East Ninth St., New quickly. The National Importing Co., 573 fr S: Portrai : f York Broadway, Dept. F-100, New Y¢ rk, N. ¥ “oa . shee pi ~ edalli I ewelry laranteed e ndry AGENTS Become a regular established LADIES Or gents need no capital or ex- food nr * toilet reauicite = MeConnon dealer Buy on credit; sell for perience Sample case of face creams. etc . crucifixe Catalog 50 , cash or credit 228 absolute household neces- free Speci offer 60% commission with dave redit z la a B ( a ities; all repeater Enjoy a sure income this add Pure Drug Products Co., Station Chicago send ; sue Ss per year, year after year City D,’’ Cineinnati, Ohio — r country trade. ‘Capital, experience ur —— —— $50,000 PICTURE Man Fric ee ry McConnon & Co., Dept. S76, $¢ 0 W E} KLY Introducing and canvassing Beginners can Winor Minr a new gas light burner for kerosene lamps weekly with my sales talk Expe - an No chimney No mantle pl free make more Free bool **Profit AG VO ’rofit élling heatleas : h ipl ‘4 ui NTS ie , n Seog kit Luther Mfg. Co., Dept. 6: Cincinnati, trait explains Sample free } sGer, ens fice. oan + Rs 9 Resi - Ohio Frie n, Dept. 8-H 11 Vi eT hn t t tape eeu u)ys =) WFreoe Marvel, 401 Broadway, Dept 8 New York AGENTS Men and Women—New spring AGENTS —Just oui $8.88 for — sult and someeet line rea ly Rai coats, under- ‘ - € é Anyone can sell Commission $3 in advance ee co house dresses, hosier; I ' 8 Ke yOne Cal ° . Die aoe playsuits sig commission Catalog free equaled, a ing det ree § t ompany yt 7 : . Free sa . 3 kt 855 Company, Dept. F¢ , May Co., Pancoe Bldg., Chicago. r ncentrated ucts (¢ B TR :, WE'LL Pay hustlers $75 up weekly sell Tampa, | G sw > verywhere to sell eeps Page tp ts . ry = 7 " es yt J : oe . ae re ' . r K eet ing our electric flashplugs, cigarette and MAKE More Mons Sell La , et gp has a ms ; a gas lighters, pencillighters. Sample lighter cloths. Big profits. Sample fre M Brings in the money and they come back for -~ania.fi ’ or . 9771 Morr N ¥ re Bi profit carry stock in your and rapid ure selling Dians su Details b Can as = ' ket Get ake ao winner: write today free J Ibee Trading Co., 799T, Broadway, ABSOLUT New rticle f aboard 2 wi g Writ Ga New York daily need; big profits; no € r proposition. Keeps Kleer Co., Inc., 208 — t f l M I epeater; free sample ig *rod Powell St., San Francisco SELL Gillette style razor blades. Gooa | "heater; et $30. itenes eae £ This! $100 auto necessity 100% seller Package 10 blades 35c: 200 bla les, = Sean . eee = fit. Repeats like gasoline. Guaranteed. | $3.50. J. Kramer, Iselin. NJ mM, A. Taylor Products Mfg. (¢ Columbus, Ohic — : Stuckey Novelty gan Lar > SELL All merchants and manufact irer andria, L GULD-LEAF Window letters and script everywhere, $1 profit each sale Four n- iGENTS— : $6 0 nuine i St. Louis, M SURPRISE Housewives! Leaky utensil wg 4 Sell for others Employ gents repaired free inst aa ad - . ter for store windows Easily 7 , 1 wn product Toilet pa ree istantl Kout ue A Free samples Liberal offer to fake your own produ ilet stration cell Mendets ar Twelve - > : : , mat . vy: : ~— © et . agents Metallic Letter Co., 438-B articles, household specialtie ete dollars daily easy Free samples, selling Clark. Chica profit Valuable booklet free National ecret Get territory quick. Collette Mfe ee —— ’ d . ser . ory quik ollette Mfg a? ent tarter Stock Scientific Laboratories, 1984W Broad, Rich- | Co. Dept. 7A, Ameterdwe WN a Srust Agen eee aes ~_ 4 ; 7. orders on Credit ‘ ond signe! . SELL Wonder Cleanser—The great chemi- lit e -00 guaranteed Extracts ure MAKE $2.00 Every hour. Sell every home liscovery. For laundry, floors. dairs Toiletries. Big Profits Vrite f wonderful preparation; mends hosiery rsils etc Revolutionizes housework Perkins Products, BE Hasti p clothing without sewing, invisible. Re 12 oz. boxes. Amazing profits. Sam. AUTOMOBILE Specialties. Gua gus eed. Send for free sample of work 3 free. Write quick, Duoform C Dept formulas for all latest money makers Queen City Laboratories, Dept. PM-6, Cin- 1, Attics, N.Y "| est prices. Write for free lists. M cinnati, Ohio. *_- : Chemist, Tujunga, Calif RELIABLE Men, full or part time. Sell EXPENSIVE Sik dres WE Have the finest needle ca every erchant printed necessities Low landed showroom 8% es sold threading needles, needle threader prices. Handsome rissions Free out uer torekeepers ladies with to 3200.00 weekly. Samy SS < part fit Experience unnecessar Kaeser & parlors, etc. Write Hirschlar’s, free. Empire, 1549 N, Wells, Dept Blayr, 72 Murdock, Cincinnati. Ohi ith, New York Chicago. AGENTS—Sell Trousers” Friend Keeps AGENTS—$25 Daily selling en's neck- WRITE Atlas Sign Works for f: trousers spick and span Sells easily. 100% wear, rayon underwear direct from manu- ing equipment Beautiful window profit Trousers Friend, Dept. 1, Box 521, facturer Send for particulars Wepteen ters Penny each! Any siz , Wo San Francisco, Calif Mills, 67 East 8th St., New York Ter to general agents, K1032 EB Chicago WONDERFUL Opportunity for entire AGENTS, Sell the automati Oy | Gi gece wa Wun - summer $5.00 per hour Saturda Sun- switch, guaranteed You can’t forget cellar . WE Start You W ithe aS & De iar : days, spare time. No experience required. lights. Prevents accidents, saves electricity Extracts, Perfumes, | Toile sends, _* Free booklet sSenson Camerascope Co., Sample $3.50; sells for $7.30. Stairway 1 «a { ~ “ania Carnation Co., 24 23-K, Delancey. New York Switch Co Glenside, Pa ous : DISTRIBUTING Agents for No-Name”’ AGENTS, $75 Weekly selling latest em- ett , powdered hand soap; removes anything from bossed card-signs, two-color how ng outf hands Free samples get business 100% changeable signs, flashing plu All mer- e nla profit Brackman Co., 2638 So. Trumbull, hants buy. Franklin Co., 22 3rd Ave., aw St., B Chicago. New York.

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POPULAR MECHANICS ADVERTISING SECTION vw each town to plate auto parts, refle bathroom fixtures, refinish beds, irr handeliers; by new method. No pi experience required. Simple plan es turing at home starts you in big sone king business Outfit furnished. ree iculars and proofs. Gun Metal Co., ve H. Decatur, —AGENTS—Here’s a , New “One. “‘Bestever Powdered Hand Seap.’’ Sells like wildfire, Marv s Discovery. Removes grease, paint, ink n fact anything from hands. Can- t skin. 150% Profit. Great Re- yea Agents simply coining money. a: Samples Get the Business.”” Write imme tely. Bestever Products Co., 4315W Irving Park, Chicago, ates AGENTS: To sell our new metal folding hat 1 coat hanger; every home or office ¥1 iy it. Bd. Gause Mfg. Co., Elk- hart, Ind SELL “Lustra” Polishing Cloth, rapidly rey metal polishes. Great sideline— 8a free Schrieber, Nashville, IL —PoLMET Polishing Cloth removes tarnish r tals without the use of liquid, paste r powder. Our agents say it sells like ‘‘hot ake Retails 25c; sample free. Gale & Inc., 15 Edinboro St., Boston, Mass. P \TENTS. Time counts in applying for patents. Don’t risk delay in protecting your ideas Send sketch or model for instruc- tion or write for free book ‘‘How to Obtain a Patent’’ and “Record of Invention’’ form. No ge for information on how to pro- ceed Communications strictly confidential. ‘rompt, careful, efficient service. Clarence A. O'Brien, Registered Patent Attorney, Securi Bank Building (directly across street from Patent Office), Washington, D. C. See pages 140 and 141. “WAKE Big money. Ke the electrical dealer in your town. Sell a big line of wt priced, ] ti N. W qual ity appliances. Wr selling plan. Dandyline Products, estern Ave., | AGENTS—New Chicago, Il. Invention! The ite for 4420 Perfect Tie Catch. A _ necessity, makes wonderful demonstration. Sample 10c. Write for par- ticulars. Novelties, Room 420, 1265 Broad- way, New York. ~AGENTS—Sell stores 5e candy Specialties, Loerrac Products, Albany, N. Y. ez “$16 A DAY Easy—I start you in auto accessory business; no investment; no ex- perience necessary. Landin, 4206 Montrose Ave., Chicago, - : ” - $10 DAILY. New, highly practical, use- ful 50c article for every home and office. Sells on sight. Hydrawlik Corp., Roselle, N iG Money and Fast Sales. Every owner buys Gold Initials for his auto. You charge $1.50; make $1.35. Ten orders a day easy Write for particulars and free samples. American Monogram Co., Dept. 40, East Orange, N. J. ~ MONOGRAM Automobiles, $1.35 Profit nN 7 ic AG makes every pen a fountain pen. big profit, Exclusive territory Marui 4 seller; where, free New GET Our Free St. I AGENTS make iinutes’ ns ENTS — Ci H. York, N. perfumes profitable ouis, Mo particulars free Mansfield, Ohi ever Invention! Ir demand increasing offered Company, Tribune Sample Case—Toi and specialties. La Derma Co., Dept. $100 week Ohio. work; every owner wants them; without ; Accessories Co., Motor- ikspoon Fast office every- Sample Bldg.. let ar- Wonder- A, furnishing Cigar Lighters to merchants on free adver- tising once kee plan Particulars sent Drake Mfg Wis. free, w Co., Dept. M, rite at Milwau- $1,000.00 REWARD if this is not the greatest prop W_ Superior, SH clean sition ever clothes in Ch ow stair corn money - house to Rk. G making known N house tablets 10 minutes without rub- Free Samples. N. R. G. Co., _Chicago ers Earn Stalling Ideal Corner Dust Shields today tor buyer Wenderlamp; Ideal Stairway Equipment Co., Yhio H232 Us the housekeeper who likes to big money in- SOMETHING New of our Every motorist a electro-magnetic-emergency takes only one minute to demonstrate and make a sale: no experience Necessary; time or evenings. $5.00 an hour easily made: Write for sample. full Von- derlamp Co., 926 Fisk Bldg., Dept. 10-A, New Y ork. TIRE Agents—Car Owners. $5 to $10 al- lowed on old tires, free 7 day mileage test on new Mellinger heavy duty tires, 15 months guaranteed, free tire offer to agents. Make $50 weekly spare time. Write for amazing offer, powerful selling kit given agents and wholesale prices. Mellinger Tire Co., Dept. 282, Kansas City, Mo., Warren, Ohio, Oakland, Calif. AGENTS Wanted to sell Men’s Hats direct from factory Write for catalog. Model Hat Mfg. Co., Dept. M-14, East Orange, N. J OUR Luminous Crucifix Shines in tne Dark. Every one amazed at the wonderful effect. Easily demonstrated—easily sold, W. G. Hannan Co., 2543 So. State St, Chicago. AGENTS—Engraved name plates, numbers, etc., easily sold, profits Brett Bros., Roxbury Crossing, ass. DON'T Sell yourself. articles, profit. Scientific mond, Va. svcc EED With Your Make them yourself. Formulas, Processes, Trade-Secrets. All lines Catalog, circu- lars free. B. Thaxly Co., Washington, D. C, EASY Money—$50.00 to $150.00 weekly selling ‘‘Jiffy Huller,’’ a device every house- wife wants. Saves time and labor shelling peas and beans. Retails $1.00 Commis- sions 90% to 140% Send $1.00 for dem- onstrating model. Jiffy Specialty Co., Ma- rietta, Ohio. AGENTS make $10.00 Daily selling Non- Splash Water Filters on sight. Best can- vasser’s article on mafket Investigate. Write for particulars, Desk 14, Seed Filter Company, 73 Franklin Street, ‘New FIBRE Brooms—detachable handles, finish. Good profits, repeat Fibre Broom eople, 147-C Ave., Brooklyn, Y. REPLATE brassy Parts, signs, large. Boston, agents Toilet for others. Make your Employ own products. household specialties, etc. 500% Valuable booklet free National Laboratories, 1984W Broad, Rich- Own Products. fine sales. The New Jersey worn-off Automobile Reflectors, Bath Room Fixtures, Worn Spoons, Forks, ete., with pure silver. Looks like new. Use U-Kan-Plate Polish. Posi- tively no mercury. $1.00 half pints. Post Paid. Satisfaction Guaranteed Agents wanted. Dept. A, U-Kan-Plate Co., Phila- delphia. “REMNANT Store, Bethel, Ohio. Greatest Dry Goods Bargains on Earth. Agents and Dealers. Ayton *¥ = ee $50.00 WEEKLY easy, Applying Gold ini- tials on Automobiles. No experience needed. $1.45 profit every $1.50 job. Free samples *“‘Ralco Monograms,”’ X1043 Washington, Boston, Mass —— WANT Distributing Agent for Hands\ick, powdered hand soap; removes anything from hands; everybody a customer; sample free Solar Products Co., J-2142 8. Troy, Chi- cago eS GENUINE Gold Leaf Letters anyone put on store windows toarnish. Large Profits. Free Samples Write today. Metallic Letter Co.. 438-1) North Clark, Chicago TW WO Money makers for agents. “Fran- cia’’ Pocket Adding Machine retails $4.85. To you $1.00. ‘‘Excellograph’’ Rotary Sten- cil Duplicator $37.50 retail. Write Type- writer Supply, 102 Hersch Bldg., Pittsburgh, Pa. ‘can Guaranteed to never Enormous Demand. “HANDSOME Profits “supplying leading self-repeating auto necessity; no competition; pay daily; write today; best season. Topco Mfg.. Dept. xX Sta H, Cleveland, Ohio THRE AD- cv TTING Thimble 25c Sample lhe. Irvel, AGENTS ~ Wanted stration sells it; for windows Seller 3973 Elston, Chicago. One minute demon- startling new glass cleaner windshields, showcases, mirrors. Send 30 cents for sample Fenton Co., 3744 78th St., Jackson Heights, New York. KWIK Straw Hat Cleaner is by millions. Need more agents Harahan, La. BIG Money selling 25c¢ article you make yourself. Costs you 5e. No license re- quired. 25¢ pkg. free Cc. C. Manufactur- ing Co., B-522, Dayton, Ohio. MAKE And sell your own goods. No ma- chinery. Guaranteed formulas. Catalog free. Clover Laboratories, (E) Park Ridge, Il. demanded Allan, 57 AGENTS—100% Profit demonstrating a new product! Surfacine keeps metal sur- faces free of rust and gives furniture and woodwork a semi-permanent polish The Surfacine Co., 3123 W. 22d St., Chicago, Il. ~~ $31.00 PROFIT—with $1.50 Outtit—Big Money—Easy Work. Selling Gold Mono- grams for Automobiles, Luggage, Windows, Wagons. No Experience No License. *‘Samples Free." NuLife Monograms, Hart- ford, Conn. AGENTS—We start you in business and help you succeed. No capital or experi- ence needed. Spare or full time. You can earp = $50-$100 weekly. Write Madiscn Company, 566 Broadway, New York “GRAND Opportunity, 150 fast sellers; commission and valuable premiums free to active agents. Send for special ple case offer. Colonial Chemical Co., burgh, Pa. COUNTY Agents Wanted. 50% commis- sion on tried and proved automobile spring oiler. Nothing else like it. Sells on sight —every motorist wants them. This is a good proposition; don’t pass it up Send for full particulars. Harvey Spring and Forg- ing Co., Racine, Wis WRITE For New Low Prices, manufacturer, Flashy Felt Rugs. colors and patterns Popular dozen. we Rug $1.40. Newark Felt Rug Co., 416-F Morris Ave., Newark, N. J. AGENTS—Mosco Corn and Callous mover will build you a steady repeat ness. Send today for pocket-size trial out- fit. The Moss Co., 403 Searle Bidg., Rochester, N. Y. STOP: 300 Fast-selling many parts of world. Proposition beat. Write for Free Wholesale Spors Co., Lesueur Center, Minn MANUFACTURE Radiant glass name and 30% given sam- Pitts- direct from Attractive size $15 Re- busi- specialties from hard to catalog. number plates, mirrors, signs, etc. Besides teach others! Investigate! Radiant Signs, 15905 Alden, Detroit, Mich. 75-$200 WEEKLY Genuine gold leaf letters for store windows, easily applied. Get the styles good sign painters use. Sign Painters Letter Co., 11416 Forest Ave., Chicago. HERE It Is—newly invented auto neces- sity that goes big with new Ford; par- ticulars free. Suburban Box 10, Mt. Wash- ington, Ohio. WIDESPREAD Demand for Our New Food Drink and new Flavorings (Black Walnut, Peach, Dixie Bouquet, etc.). Many other fine products. More agents needed. Blair Laboratories, Lynchburg, Va . INSTANT Weld Welds Rubber Instantly. Stock’s Profit One Day $72.25. Enormous demand. Exclusive territory Free sample Tourists Pride Manufacturing Co., Desk G, Minneapolis, Minn AGENTS And Mail Dealers cleaning up with Lanowa Combination 200% profit Everything furnished Write quick for sample. Fraser Products, 212-J Westport, Kansas City, Mo CALIFORNIA Perfumed beads selling like hot cakes Agents coining money Big profits Catalog Free Mission Factory P, 2328 W. Pico, Los Angeles, Calif PHOTO Medallion Men and Women, the largest line of Photo Novelties in the world. Lowest prices, quickest service Send for catalogue showing over 200 money makers. Photo medallions, photo medallion clocks, photo mirrors, photo fountain pens, photo powder compacts, photo jewelry and photo buttons Gibson Photo Jewelry Co., 608- 614 Gravesend Ave.. Brooklyn, N. ¥ DON’T Sell for others. Employ agents yourself Make your own products Toilet articles, household specialties, etc. O00 profit Valuable booklet free National Scientific Laboratories, 1984W Broad, Rich- mond, Va SEND name, address on postcard Free introductory copy Modern Salesology Maga- zine: 1000 money-making opportunities of- fered by big reliable firms; no obligatior Salesology Magazine, Desk B-38, 500 No. Dearborn, Chicago AT Last! Diamond Rival Discovered! Amazing blue white Rajah Gem astounds and deceives. Beautiful case free, $100 weekly. Rajah Diamond Company, F20, Salis sbury. N.C a 2 fees, SELL men’s neckwear; wonderful propost- tien Astor. 218-M Broadway New York 25¢ * PROFIT On every misevesante La. sale. Box 500,

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58 POPULAR MECHANICS ADVERTISING SECTION AGENTS—Brush and Broom Catalog with sample Case Assortment of 50 different kinds of Brushes sent without deposit to responsible Brush Salesmen. National Fibre Broom Co., St. Louis, Mo. HIGH-GRADE SALESMEN WANTED SALESMEN Now calling on garages, ac- cessory and other dealers to introduce the revolutionary new way of cleaning and pol- ishing motor cars that’s being adopted by garages and car owners throughout the coun- try; because it is quicker, easier to use, and most important of all it costs only one- fourth of old methods. A quick demonstrat- ing money making sideline for hustlers. Must have auto, and send 25¢ for pocket selling outfit, which includes sufficient for 8 to 10 cars. Address Common Sense Mfg. Co., 2150 P ine, St. Louls, Mo SALESMAN—Side line or full time, call- ing on banks, offices and factories. Brand new automatic all metal, self-inking dater. Every call a prospect Thousands being sold Sample carried in vest pocket. Won- derful opportunity, very liberal « mmission. Factory 200 Shepherd Ave., Brooklyn, N. MANUFACTURER Wants salesman to sell double tread tires, reliners, skived patches, blowout tube repair kits, ete., to boots, vuleanizers, garages, tire, accessory, hard- ware and general stores, on liberal com- mission basis. Economy Rubber Products Company, 420 Master Ave., Dayton, Ohio MAKE Big money—sSell our nationally known all woool tailored to individual meas- ure suits $23.50-$29.50. Commissions $4.00- $5.00 Your big opportunity! Large sam- ple outfit freee! Write General Tailoring Co., Dept. 6, 529 8S. Franklin, Chicago. NEW! Fast seller! Make $3.00 an daily Sell ‘‘Advertising Work Every workman, business a prospect. grade low-priced Coveralls, hour Suits.’’ High- Shop-coats, 2- piece Overalls. Firm name and advertise- ment woven on back Outfit free. John Leeding Co., Dept. 396, 70 E. 18th, Chicago ~ $i TO $25 Daily 3iggest —s line of 2-piece suits $9.95 and $12.50; 3-piece wool suit, $17.95 ‘cular $28 06 value). All-wool overcoats, $18.50. Splendid rain- coats slickers and boys’ suits, Biggest commissions. Free outfits “Jim’’ Foster, Inc., Dept. 26, 2250 8S. Spaulding Ave., Chicago, Il SALESMEN—AIl or part time in small towns and country known bath required, petition, districts selling our well- room equipment. No plumbing ready for instant use No com- easy to sell, big commission. Only sale a week would pay you well Invest- ment unnecessary. Reply Dept. 60 Roberts Metallic Bath Co., 736 Meldrum Ave., De- troit, Mich EXPERIENCED Salesmen—Attractive en- amelware propositions—classy colors—easy sellers to hardware, furniture, drug, variety, general st Prices below average. Qual- ity and missions above average Iron City Tin & Enamel Pittsburgh, Pa Ware Co., Box 706, ~ SALESMEN—125 Varieties brushes, 60% commission, $25.00-$100.00 weekly profit on agents. Neway Brush Factory, Hartford Conn EVERY Woman buys “Marvtex” because it doubles wear and prevents runs in silk hosiery Guaranteed. Big repeater. Agents making big money Write now or send 50 cents for big package and be convinced Marvtex me tenes vag Co., 1727 West Mor- Tis St., Indianapolis | $20 DAILY Rasy New sensational seller, tire armor, doubles mileage, discarded tires give 20,000 miles; outfit free; pay daily. Motor Products, 1758 Lunt, Chicago “NO Canvassing from house-to-house $10 daily, full or spare time, district sales manager. A dignified, respec- table, good paying position open to honest, reliable men and women Write for de- tails. No obligation. Badger Co., Ft. At- kinson, Wis ~ COMMISSION Tn seat covers, we “Make acting as our advance—Selling auto deliver and collect; experi- ence not necessary Write today for sam- ples and proposition. Horne Motor Co., Magnolia, N. C. “WONDERFUL Ynvention seals fifty en- velopes minute Sells on sight at $3.50 Exclusive territory Kendall Sealer Co., Dept. H20, 210 South St., Boston, Mass. MR. BRUSH Salesmen—Old Established New York brush manufacturers require services of men in all territories to sell their extensive line of Sanitary Twisted in Wire Brushes We pay larger commission than any other brush house in the country Write immediately for proposition. Wire Grip Sanitary Brush Corporation, 41-51 East llth St., New York. HOUSEHOLD Mops, ~ self-locking: col- lanpsible frames; yarn sewed on cotton back- ings; lie flat, covering large surface; no wires, washable, Also car mops; nothing like them; all patented. Write W. O. D. Mop Company, 672 South 17th St., Newark, —TooL Salesmen and mechanics with some sales ability sell our line electrical tools to auto mechanics and garages. Easy sales, and very liberal commissions. Barker Spe- cialty Co., Girard, Pa. MAKE $15.00 A day selling original pat- ented Phone Memo Recorder. Sells itself. No competition. Golden opportunity. Write for territories. Rudley Mfg. Co., 52 SB. 60th St., Philadelphia, Pa SALESMEN Wanted to sell” ~ business printing, highest quality, big commissions, lowest prices. Instruction and outfit free. l'. S. Stationery Co., Greenfield, Ind “ATTENTION: Specialty and clothing sa'esmen Fastest selling line today One suit or top coat $15, commission $°%.50 Two for $28.50, commission $6 plus bonus. Union Talioring Company, Denver, Colo ~ PUNCHBOARD Salesmen. $150 weekly, selling new double profit deals from cata- log 100% prospects. 90% sales. Exclu- ive territory Repeat commissions. Rudy Sales 1652 Division, Chic: ago 3 vason just ahead. Advertising pen- ells ~%., popular every day—every business prospect. Our line repeats. Big commis- sions. Established in 1902. North Amer- ican Pencil Works, 126 So. Clinton, Dept. 55-M, Chicago. “~WMEN—Sell_ dependable shrubbery. fruit trees, etc. Steady demand Complete co- operation. Commissions paid weekly We deliver and collect. Write Perry Nurseries, Dept. R-6, Rochester, N. Y ~~ A PAYING Position open to representa- tives of character. Take orders shoes-hos- iery direct to wearer. Good income. Per- manent. Write now for free book ‘Getting Ahead.’” Tanners Shoe Mfg. Co., 356 So C St., Boston, Mass. EASY To sell complete line of groceries, paints and auto oils from samples to con- sumers Steady profitable work; no capital or experience necessary. Commission ad- vanced. Liberal credit. Loverin & Browne, Wholesale Grocers, E 1500 So. State, Chi- cago. BiG Pay every day! Complete guaran- teed line direct to wearer— shirts, overalls, coveralls work pants, sweaters, underwear, playsuits $10-$15 daily; experience unnecessary. sige outfit free! Nimrod Co., Dept. 65, 4922-28 Lin- ri coln Ave., Chicago ~ $£.00 PROFIT On $5.00 sales— ple’’—New specialty. Money getter. Every storekeeper, doctor buys quickly Experi- ence unnecessary. Territories open. sox hf Hartford, Conn. EARN $20 A day. Est life selling for $1 insurance policy So. LaSalle, dress shirts, work "Free Sam- ish income for a year, $1,500 accident Write W. C. Stone, 11 Chicago DON’T Sell for others. Employ agents yourself. Make your own products. Toilet articles, household specialties, etc 500% profit Valuable booklet free. National Scientific Laboratories, 1984W Broad, Rich- mond, Va 10% COMMISSION Selling printed bust- ness stationery at knockout prices Part or full time. Free outfit. L Process Sery- ice, Minneapolis, Minn WERE You Ever Offered a Grocery Store? Our proposition is better Let us tell you how you can handle groceries, auto oil, tires and paint. No rent, no investment in goods ig pay Write. Just say, “Show me.” Hitchcock Hill Co., Wholesale Grocers, 38 Kinzie. Dent. 50. Chicaco SALESMEN To sell interchangeable socket wrenches. Good commission. Howerd, 2417 N. Ashland Ave., Chicago. JUST One Changeable Letter | : window display with moving colo and light—The Luminate. Our boys get e bis money. Don’t risk patent infringe: 4 sell the original. 1928 refinements and ed features make todays’ Luminate irr . A weather-proof number for outdo Join the Luminate money-makers Products Company, Ltd., St.. Kansas City, Mo. SALESMEN—Become Independent Ow your business; experience unnecessa ll. ing our $7,500 Accidental Death: § 4 cident; $25 Sick Weekly Benefits—s$1} 9 yearly. Other amounts proportionat G anteed steady income from renewals, $ ) deposited Insurance Department, 1 rsal a Dept. A, 40 Clinton Street, New ~ YOU Gan make big money introduc: changeable letter signs. Every nt buys. Fast sales; big profits. Write for ex clusive territory now Changeable Sign ( Department M, Redlands, Calif. TOOL Salesmen—Sell to auto me guaranteed line of 120 Oldforge wrenches, pliers, chisels, screw punches, tool boxes Exclusive terr Give complete information about first letter. Quality Tools Corporation, Wilmington, Pa. SALESMEN 405-9A, East 3ic Cemetery, Memorial 1} Mausoleum Experienced and inexperi: Urgent need of men You can earr Free information. J. Joerg, 326 Mt. Ver Grand Rapids, Mich ALL-YEAR-ROUND selling wonderful new cleaner. Removes grease, oil, ink and quickly Every home and business | ea live prospect 100% profit. Big repeat or ders. Exclusive territory Write for free sample. Seacoast Laboratories, Sea Brig J Profitable business water softener i SALESMEN—Semi- Liquid punctures and blowouts rubber without heat or tools: Everyone buys. Salesmen coining money. Get territory quick. Marquette ( P 2325A Wolfram, Chicago. _ - GOLD-LEAF Window letters and script signs. No experience; 500% profit. Samples free. Meyer writes 5 days profits $141 Consolidated, 69-V, West Van Buren, C! cago SALESMEN—F ur $15.00 gales to chants net you $40.00 daily Savers Sys- P tems, ‘ Sheffield, Chicago, Tl ¢ ANY Salesmen Can Sell Them! Merchants everywhere use punchhboards Someone : them, why not you? Collect big commissior daily. Newest, largest, elaborate cata sent upon request. Lincoln Sales Co., 9 S - Clinton. Chicago. Devt. D._ ~ $60-$200 A WEEK. Genuine Gold Let ters for store windows. Easily applied. Free samples. Liberal offer to general agents Metallic Letter Co., 438-A North Clar! Chicago SEND name, address on posteard. FY intreductory copy Modern Salesology M zine; 1000 money-making opportunities fered by big reliable firms; no obligat Salesology Magazine, Desk B-39, 500 Dearborn, Chicago 7 ~PUNCHBOARD Salesmen. 2 hours dail “ $100 every week. New line. Lowest pr Full commission on repeat business ( log free. Puritan Novelty Co., 1409 Ja son. Chicago TO Market 3A ; garage door holders, sin automatic action, quickly installed, instar 1 attracts garage owners, builders, de Write for exclusive territory propos! Knowlson-Stevenson Co., 1118 Packard, A Arbor Mich WONDERFUL Free Selling Outfit w actual samples of Bostonian sroad makes quick sales for our WNatior Known Bostonian Shirts at 2% for $ Postage Paid; $9.00 value: guaranteed colors. Liberal cash commission of $1 on each order of 3 shirts means Rig Mor for you. Bostonian Mfg. Co., Dept. M Boston, Mass. PUNCHBOARD Salesmen—making st towns. One sale a day nets you $ weekly. Full commission on repeats. KA Sales Co., 4395 Ravenswood Ave., Chica HELP WANTED GET Any job you want quickly—send d bill for book ‘‘Making Most of Your I’ sonality and Ability’’ and ‘“‘Three Way Sell Your Experience and Services.”” ‘ $40, $50, $60 a week and up, now I Open Door, Box 179, South Norwalk, ‘

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hanic rivers, Titory urself, . New Park, enced, more. ernon, isinesg r and d dirt lace a at or- r free bright, epairs at or oining p Co., script mples 41.36, Chi- mer- Sys- hants sells ssions italog 9 So Let- Free rents. lark, POPULAR KiED Positions $2,500 to $25,000. lf e open to overtures for new con- and qualified for a salary between $25,000, your response to this ar ment is invited. The undersigned pr a thoroughly organized service, of ed standing and reputation, through eliminaries are negotiated confiden- positions of the caliber indicated. procedure is individualized to each -personal requirements; your identity nd present position protected. Es- ed seventeen years. Send only name idress for details. R. W. Bixby, Inc., vntown Building, Buffalo, N. Y. —S\LESMEN: Manufacturer “and distrib- ytor of one of country’s leading lines auto- hand tools and equipment has ex- ! territory open. Proposition assures good income to right man on commission i Applicant must own car. Write for tion to Woods Organization, Inc., 37 W. 20th St., New York, N. Y. YoU Are wanted to resilver mirrors at home Immense profits plating autoparts, t are, etc. Write for information. Plater, 287, Marion, Ind. DAILY In advance (spare time lo) introducing 12 months insured All styles and colors, for men, children. “Silk to Top’ ladies’; es’ “‘Sport’’; men’s ‘‘Fancies.’’ Cap- experience umnecessary. We furnish ples. Silk hose for own use free. New Spr le, pl Milton Mathews, Park 2606, Cincin- nati, Ohio. CASH Paid for Butterfiles, Insects. See s ir Display Ady ertisement on page 32. —ORTAIN Employment! Get positic ns you want, quickly, anywhere. Use clever ‘“Ways That Win.”’ One person was offered 70 bs! Complete methods, 50 cents. Money pr a returned if wanted. New Idea Ser Box 39-1, Station K, New York. 1) TMENRE & Profits making French plate rrors; patented process; easily .earned. Pi ns free. Wear, Excelsior Springs. Mo. SLND name, address on postcard, Free ntroductory copy Modern Salesology Maga- zine; 1000 money-making opportunities of- fered by big reliable firms; no obligation. Salesology Magazine, Desk B-40, 500 No. Dearborn, Chicago. BECOME A Landscape Architect. Un- crowded profession; wonderful opportunity oney-making. Easily mastered by mail. Earn while you learn. Est. 1916. Write ss details. Landscape School, 56, ewar>rk, +*%. MAILING LISTS 99% GUARANTEED Mailing lists. Ac- te Reliable Guaranteed. The kind hat produces business; compiled for every possible business or individual. Lists of every kind of any business or individuals piled for your individual needs any where. Catalog and information on request. National List, 847 Broad, Newark, N. J. () 1628 WOMEN Buyers names, $1.00. Sheasgreen, PM1427 North Penn, Minneapo- MECHANICS ADVERTISING 1,000 LETTERHEADS $4.00; 1,000 En- velopes $3.00. Postpaid. Fred. W. Payne, Plymouth, Pa. es. 200 LETTERHEADS And 100 envelopes, $1.10, postpaid. Oberman Company, Box 1268, Chicago. LETTERHEADS, Envelopes, $3.00 thou- sand. Robt. E. Troup, Northumberland, Pa. 150 LETTERHEADS S8%éxfi, 150 envelopes 6% printed $1.00 postpaid. Coyle & Kim- balls, Newport, _ New York. ss. Graham Printing Co., Colorado Springs, Colo 350 5%4x8% GOOD Letterheads and 150 envelopes, printed, postage paid, only $1.00. L. T. Norton, 45 Richton Ave., Detroit, Mich. BUSINESS Stationery. Lowest prices Excellent workmanship. Modern type faces Moulton Printing Company, 1410-P East Sth, Kansas City, Mo. 1,000 ENVELOPES $2.95. Letterheads, circulars, folders, circular letters. We write advert'sing copy. Free samples. Able Printing Shop, 416 So. Dearborn, Chicago $2.90 DELIVERED. 500 Bond letter- heads and 250 envelopes. Thousand letter- heads, $3.50 Multigraphing $2.00 thou- sand. Samples. Robert Cook Company, Mc- Comb, Miss. HALFTONES, Etchings at cost. Good printing quick, cheap. Rural Press, Con- tinental, Ohio. ~ 200 LETTERHEADS And 200 envelopes, printed in two colors, $2. Batmin Press, 403 East 158th St., New York City. MULTIGRAPHING Business correspond- ence two dollars thousand. Hammermill letterheads, four dollars; inexpensive quality, three dollars. Mjscellaneous printing. May- era Corporation, Monmouth, Ill 150 EMBOSSED Letterheads, 150 envel- opes, $2.00. Soler, 175 West 126th St., New York. “NEARGRAVURE” Processes—250 each business letterheads, envelopes (plateless embossed), $4.75 postpaid. Samples (state business). Sollidays, Knox, .__ Ind. THREE Color gummed labels—Rubber stamps—money __ getters. Moderate prices. Lists free. McPherson Printing Co., Mid- dletown, Conn. 125 BOND Letterheads $1.25, to match $1.00. Shaw, Box 151, New York. $2.95 DE L IVE SRED: 500 Letterheads &% xll and 250 envelopes. Cash. Print any- thing. Catalog free. National Printing, Goshen, Ind. SPECIAL: $2.95 Delivere a; q 000 printed envelopes, business cards or statements. Let- envelopes Dunkirk, terheads, $3.95. Free samples. Z. Process Service, Minneapolis, Minn. $2.00 DELIVERE D—2 50 E ach: Envelopes, 8%xl1l letterheads Samples? Williams Company, Box 1025, Portland, Me. Minn WE print Stationery, Booklets, Catalogs, Circulars. Samples. Commerci Press, TYPEWRITERS AND SUPPLIES an a munedliiens TYPEWRITERS, all standard makes. $10 250 BOND S ethetmend ion -~ ~ Bill- ip. Fully guaranteed. Free trial. Write ; : SESEREOSS, SEverapes, y: fi r complete illustrated lists. Northwestern ia. 7 $1.35 each. Economic Press, vriter Exchange, 121 N. Francisco Ave., ‘ cago. TY PEWRITERS—Factory Rebuilt Royals, Remingtons, Underwoods. New Royal, Rem- ton and Corona Portables. New ‘‘Excel- lograph’’ Rekery Stencil Duplicator $37.50. Terms Catalog Free. Pittsburgh Type- writer Supply, 945—339 Fifth Ave., Pitts- burch, Pa TYPEWRITER Ribbon 35c, box carbon paper 90c, prepaid Write for sales propo- ion. Miller, 634 North Eighth, Allen- town, Pa TYPEWRITERS—AI! standard makes, §7 to $29. Fully guaranteed. Dee Typewriter Exchange, Ada, Okla. TYPEWRITERS, Motorcycles, Radios, $7 4 $35. Knights, 1512 Locust, St. Louis, PRINTING, ary te AND MULTI- GRAPHING 200 BOND Letterheads, 8%x1l. 150 en- velopes $2.00 250 business cards $1.00. 500 statements $2.00. Dept. E, Hoosier Print Shop, Portland, Ind MAIL Order multigraphing and mailing service. Box 1071R, Knoxville, Tenn. QUALITY Printing! Reasonable Prices! Send for Free Standardized gamete and prices. Folders. Circulars Catalogs our specialty. Earnest Fantus, 525 South Dear- born, Chicago. — iat ‘ : SAVE Money on your printing. Get our price. Any size job. Any color. C. W. Knowles Company, Cincinnati PRINTING—AIll_ kinds. Superior work, prices low. Rattlefield Press, Gettysburg, Pa. Free batt!efield souvenir. 500 BUSINESS Cards 98c. Other print- ing reasonable. Samples free. Hanzer’s, 1039 8S. Cleveland, Philadelphia, Pa. PRINTING, OUTFITS AND SUPPLIES PRINT Your own stationery, cards, book- plate, Christmas cards, circulars, books, pamphlets, etc.; complete outfits, $8.85; larger, $11, $29 rotary $149 Print for others. Easy and interesting rules sent. Write for catalog presses, type, paper, etc. Kelsey Company, K-11, Meriden, Conn PRINTING Outfits—Presses, type sup- plies, type novelties. Send stamp for cata- logue. Model Press, York, Penna. SECTION 59 DUPLICATORS AND DEVICES YOU cam make 50 to 100 copies of a letter, notice, etc., at a cost of three cents on a Heyer Quality Duplicator. Write for free trial offer. The Heyer * oral Co., 909 Jackson Bivd.. Chicago, Ill RUBBER STAMPS NAME And address, two lines, 25. Self- inking pad 20c. Catalog. Rubber Stamp Shop, Muncie, Ind. “RUBBER Stamps—Three lines Soc. Cat- alog free. Newman & Son, Auburn, Nebr ADDING MACHINES NEW $5.50 Automatic Adding Machine Adds, subtracts, multiplies, absolutely ac- curate. Capacity $999,999.99. Fully guar- anteed. 75,000 pleased users. Makes add- ing easy, positive, quick. Eliminates mis takes. Saves time Postpaid $3.50. Bas- sett Co., 1458-T, Hollywood Ave., Chicago FOR THE HOME FAUCET Washer. New invention! Noth- ing better Outwears all others Fits all faucets; shuts tight at easiest turn. Stops plumber bills and water loss Send in 2%« Weise & Sons, Ridge- for 8 diff. washers. wood, N. J KITCHEN Daylight unit with enameled ceiling fixture opal glass, ready to install $1.48. Will ship C. O. D. General Distrib- uting Co., Duluth, Minn FOR Furniture decoration make silhouettes of yourself, friends, pets, ete Also signs showcards, $1.00. Particulars for stamp H. M. Bir, 79 W. Rittenhouse, Battle Creek Mich WATER Pumped night and day with Rife’s Hydraulic Ram. No attention, no expense. Write for catalog Sold exclu- sively by H. T. Olsen, Park-Row Building, New York GRANDFATHER’S Clock Works. $5.00 Build your own case; Instructions free; make good profits selling yor friends Clock works with chimes for o.d or new case Write for full particulars, Clock Co, Ruff- ner St.. Philadelphia. CEDAR chests only $11.65— Red-i-Kut™ complete with rich copper trim—you as- semble and save half—send for pictures Kuempel Furniture Company, Guttenterg lowa GUNS. SPORTING GOODS, ETC- ENGLISH War office field glasses, $°.9>: holsters, $1.00; exercisers, $1.20 Free catalog. Huds n Sporting Goods, W54 War- ren St., New York. BUSINESS ADDRESSES BROADWAY 200—Best address in New York. Two blocks from Wall street. Desk room or mail privilege Rates exceedingly reasonable. We forward your mail daily Room 404 BOATS AND LAUNCHES BOATMEN: Convert your own Ford en gine and save $75 to $100 Send stamped envelope for marine parts list and ‘‘How Redwing Propeller Co. (Ballard), Seattle COLLAPSIBLE Canvas boat Fits nicely on running board of car Ready for use in few minutes; 16 feet long, strong and at- tractive. Write. Langen Folding Boat Co Whalom Rd., Fitchburg, Mass TWENTY Mile outboard motor boat, plans Sixteen foot outboard cabin cruiser, plans 59 cents Free boatbuilding catalog The Rudder, 15 Murray St New York HUBBELL Marine engines into marine Ford speedboat 25 «cents Coolers convert. Ford motors Jooklet free easily built, large blue- print and directions one dollar. C. C. Hub- bell, Perry Ave Norwalk, Conn PROPELLERS, Pumps, stuffing boxes. bearings, other fittings Wm. H. Baker, Pond St., Quincy, Mass OUTBOARD Motor Racer and family speed boat, blueprint and directions for building $1.00. S. E. Wien, 4th St., E. Norwalk, Conn AIR Propelled seaplane type speedboat easily and cheaply built at home using our drawings and instructions Send $2.00 for complete set or dime for illustrated folder Airsled Company, P-176, Cedarville, Mich

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DIAMONDS, WATCHES AND JEWELRY FIERY Diamond-like Sterling rings; qual-

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C-FAR Field Glasses $2. rimmed lenses in neat leather case, 8 27. -™ levine. "Dept. J,

ANTIOUES- Bf oe te AND

LARGE Illustrated list curios, , old arms, ten cents. b “MEXICAN Yaqui Indian potte a a pewter, engravings.

AUTOMATIC Cigarette Making Machines. 50 cigarettes for 10 cents. illustrated catalog. 5 6247-51 Broadway, Submit poems. Pro- ~ CORNETISTS—Trombonists Booklet free. Boucher’s Harmony

SONG Poem \ Writers, Write Sequoia Song- Sherman Branch, Los An-

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a WANT Song Poems.

(formerly of Sousa’s Band), Oshkosh,

POPULAR MECHANICS ADVERTISING WRITE Songs. Big money and reputa- tion. Write for information, Gordon Pub. Co., 201 N. Hoyne Ave., Chicago. “BONG-POEM Writers: Address Monarch, 23 36 W. 55th, Dept. 104, New York. “SONG Writers: Send for our “Publish- ing Agreement."” McKinley Music Printers, 1501 E. 55th St., Chicago. ~~ COMPOSERS; Verse or music, brilliant opportunity. Write at once. Burrell Van Buren, 1910 Woods Theatre, Chicago.

PATENT ATTORNEYS PATENTS. Time counts in applying for patents. Don’t delay in protecting your ideas. Send sketch or model for instruc- tion or write for free book “‘How to Obtain a Patent’”’ and ‘Record of Invention’’ form. No charge for information on how to pro- ceed. Communications strictly confidential. Prompt, careful, efficient service. Clarence A. O’Brien, Registered Patent Attorney, Security Bank Building (directly across street from Patent Office), Washington, D. C. See pages 140 and 141. “INVENTORS Having ideas to patent: Write for booklet explaining co-operative plan for handling your applications Tells how to sell and safeguard inventions at lowest cost. Ralph Burch, Patent Lawyer, 900 F St., Washington, D. C. ~ PATENTS—Free valuable book sent upon request. Save time—Forward sketch or mod- el for our free confidential report. Favor- able report rendered only when we con- scientiously believe your invention contains merit and is of commercial value. Ameri- can Industries, Inc., 222 Victor Bildg., Washington, dD. C. PATENTS Procured, prompt service. Per- sonal, careful and efficient service. Highest references. Moderate fees. Send sketch or model for actual search and advice. George P. Kimmel, Master of Patent Law, 54F, Legal Bidg., Washington, D. C. “SELL Your invention before + Write for free particulars. W. 801 Baltic Bldg., Washington, D. C. UNPATENTED Ideas can be sold. you how and help you make the sale. Free particulars (Copyrighted). Write W. T. Greene, 806 Baltic Building, Washington Cc.

patenting. Green, T tell

“PATENTS Obtained under co-operative payment plan. Write for particulars. W. E. Beck, Registered Patent Lawyer, 951 Baltic Bidg., Washington, D. C. ~~ PATENTS— Write for our free book, to Obtain a Patent’’ “How and Record of Invention Blank. Send model or sketch of inventions for inspection and instructions free. Terms reasonable. See advertiseements on pages 142 and 143. Victor J. Evans & Co., 934 Ninth, Ww ashington, — D. c ~ JOHN PATTEN DU FFIE, patent attorney, Victor Building, ton, D. C. Reasonable rates. Booklet. PATENTS—Write for Instructions Miller, Registered Patent Attorney Patent Office examiner), 211-A Building, Washington, D. C. __ ~~ PATENTS, Trade-marks, Copyrights. Re- liable services by an experienced practi- tioner devoting personal attention to each case. Inquiries invited References fur- nished. B . Fishburne, Patent Lawyer, 525-A McGill Bldg., Washington, D. C RICHARD E. BABCOCK, Patent Lawyer, Washington Loan & Trust Bidg., Washing- ton, D. C. Booklet. ESTABLISHED 1864 Company. Free Booklet Marks, Copyrights. Office Block, Catease; ington, D “INV ENTORE_ Write for our 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. Randolph & Co., Dept. 430. Washington, D. C “INVENTORS: Send sketch or model for advice and exact cost of patent. Ask for our Free book: “‘How to Obtain a Patent.”’ Tells what every invengor should know. Es- tablished twenty-eight years. Highest refer- ences. Prompt service. Reasonable charges. Chandlee & Chandlee, 414 Seventh, Wash- ington, D. C FREE tions. D. ~ Registered Washing- Advice free. ~ Carl (former McGill Milo D. Stevens Patents. Trade- ces, Monadnock Barrister Building, Wash-

~ Advice on patenting new Inven- Sterling Buck, P-692 F, Washington,

SECTION PATENTS Procured: Trade Marks Reg. istered — A Comprehensive, experic ed prompt service for the protection and de. velopment of your ideas. Preliminary ad- vice gladly furnished without Gates 300k- is of information and form for disciosiy Idea free on request. Irving L. Me(at rane 200 Owen Bidg., Washington, D. ( or 41-R Park Row, New York. LANCASTER and Aliwine, 221 Bldg., Washington, D. C. “Originators of the Form Evidence of Conception.’ Be- fore disclosing your invention to anyone send for blank form to be signed and wit- nessed. Form and patent information pbul- tet free. PATENTS—Free advice. Conti jential, Prompt personal service of Registered Pat- ent Attorney, former Patent Officer Exami- ner. Booklet. Albert Jacobs, 727 Barrister Bidg., Washington, D. C. PATENTS, Trade- Marks, Designs. This firm has 27 years’ experience and gives ex- pert personal service at reasonable rates. We properly protect your invention. Write for free information and exact cost of procuring patent before proceeding. John B. Thomas & Co., 902 F St... N. W., Washington. D ¢ ADVICH Free! Patents procured— Rea- sonable—efficient Service. 25 years’ expe- rience. Chester W. Brown, Registered | ent Attorney, 510 Van Buren Street, Chi- car ro. PATENTS. Booklet free. Highest reter- ences, Best results. Promptness assured Send model or drawing for preliminary ex-

Ouray

amination, Watson E. Coleman, Patent Lawyer, 724 Ninth St., Washington, D. « ~ PERC Y S. WEBSTER, 203 Saving and Loan Building, Stockton, California. 1 ng established organization. Patent booklet NVENTOR’S Guide” sent free. ee LACEY'S Patent “Valuable i - Sense.

free. See ad page 144. FOR INVENTORS PATENTS. If you have an invent which you wish to patent you can write fully and freely to Munn & Co., for advice in regard to the best way of obtaining | tection. Please send sketches, or a m of your invention and a description of ¢ device, explaining its operation. All c munications are strictly confidential. Our Hand-Book on Patents is sent free on r quest. This explains our methods, ter etc., in regard to Patents, Trade Ma Foreign Patents, etc. “Scientific Ar ican’’ contains Patent Office Notes, [De- cisions of interest to inventors and pa ticulars of recently patented inventions Munn & Company, Solicitors of Patent 1523 Scientific American Building, 24 WV 40th St., New York City: 524 Scient American Blidg., Washington, D. C I Tower Bidg., Chicago, Ill.: 666 Hobart Bidg., San Francisco, Calif.; 521 Vao Nuys Bldg., Los Angeles, Calif PATENTS Procured; Trade Marks R istered — A Comprehensive, experiet prompt service for the protection and velopment of your ideas Preliminary vice gladly furnished without charge. B let of information and form for disc! Z idea free on request. rving L. MeCathra 200 Owen Bidg., Washington, D. C 41-R Park Row, New York INVENTORS Universal Educator — cor tains 900 mechanical movements: 50 p< petual motions, Tells how to obtain sell patents. Suggests new ideas. Exp! how to select your attorney and avoid pa sharks. Price (revised edition) $1.00 po paid. Albert B. Dieterich, 621-Ouray Bld Washington, D. C. “GET your own patents. Legal bianks complete instructions $1. Cutting Sor Campbell, Calif,

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Ks Reg. rienced, ind de. ary ad- Book- SClosing Sathran, C., or Ouray tors of Be- anyone nd wit- mm bul- lentiaj, Pat- Exami- arrister This ves ex- ss. We "ite for ocurt — * —Rea- expe- d Pat- » Chi- refer- Ssured. ry ex- Patent DC ig and Long ook let ws ldg nks, POPULAR PATENTS. Time counts in applying for Don’t delay in protecting your Send sketch or model for instruc- rite for free book ‘““How to Obtain Pat and ‘‘Record of Invention’’ form. x e for information on how to pro- eed Communications strictly confidential. Prot efficient service. Clarence 0 Brien Registered Patent Attorney, Secur tank Building (directly across treet m Patent Office), Washington, D. ‘ s ages 140 and 141. PATENTS—Write to B. P. Fishburne (a Sou ze linean), Registered Patent Law- > McGill Bidg., Washington, D. C. ireful ] AM in touch with hundreds of moneyed met | manufacturers who wish to buy yood inventions, Write Hartley, 38 Court st., Bangor, Maine. How to get them. Marvelous new ethod tells how to succeed at inventing. te details 50c. No stamps. L. Harold Sherman Branch, Los An- IDEAS Dur Box 703, Calif PATENTS Wanted tion Box 126, “by manufacturers. Send é Dowagiac, Mich. INVENTORS—Write for our free book, H to Obtain a Patent’? and Record of Blank Send model or sketch of for inspection and _ instructions free Terms reasonable. See advertisements pag 142 and 143. Victor J. Evans & ‘ 7 Ninth, Washington, D. C FSTABLISHED Concern with ample man- ng and sales facilities will consider of a limited number of simple in- of practical marketable value. In ive classification or nature of article. B : x Popular Mechanics, Chicago. [NPATENTED Ideas can be sold. T tell w and help you make the sale. Free particulars (Copyrighted) Write W. T. Gree 807 Baltic Bidg., » Washington, D. ¢ SELL Your invention before patenting. Write for free particulars W. T. Greene, x02 Baltie Bldg., Washingten, D. C. PATENTS Obtained under co-operative I ent plan. Write for particulars. W. E. Keck, Registered Patent Lawyer, 950 Baltic Bldg., Washington, D. ; FREE Information regarding selling be- e patenting. Sterling Buck, 692 F, Wash- gton, D. C. L (CEY’S Patent Sense. Valuable book See ad page 144 PATENT Talks” discloses practical in- expensive system of developing, patenting irketing inventions Williams Engi- ing Service, 716 Pacific Bldg., San Franciseo, Calif | SELL Patents. A service of nationally- reliability since 1900. Charles A. Seott, TTSPM Garson Ave., Rochester, N. Y. PATENTS FOR SALE Mancos, Rt. 2, Richmond, Va. PATENTED Hair Curler; automatically ifts hot end; other new features Nolie Simmons, Statler Hotel, Detroit, Mich WE Commercialize inventions Communi- tate ith us if you have patent to sell or AC TOMOBILE Gate for driveways and 1 crossings. Stock cannot pass. A. lL. Merrill, 500% Bellevue Ave., Syracuse, N.Y FOR Sale—U. S. patent on Child’s Lawn Swing. Operates by levers; nothing like it irket. A. F. Fritz, 409 N. Peterboro St.. Canastota, N. Y. SOMETHING New in | ted possibilities as an t Patent No. 1661513, issued March &, 1928 Cash or royalty basis. E. N. Swett, South Sioux City, Nebr. TUBE Tester. Test auto tubes under high pressure Royalty or outright. Geo. golf tees. Unlim- advertising spe- to buy one North American Finance 1 Development Corp., 915 15th St., N. W., hington, D.C. UNITED STATES And Canada patents. Improved dish drainer; outright or royalty basis. Reasonable. Minnie Hatcher, Tyler, Ala PERFECT Safety Envelope, Patent 1184, for sale. Patent allowed Dec. 17, y2 Julius Koesis, P. O. B. 323, Prince- N. J OUTRIGHT Or royalty basis: Safety razor, most economical, cheap to manufacture, ex- ent improvements. Khaira, P. 0. Box MECHANICS ADVERTISING OUTRIGHT—A new toy, builds dozen different vehicle forms with same set. Wm. Katow, 421 8. Harvard Bivd., Los Angeles, Calif. Navasota, Tex. OUTRIGHT—New, handy butt manufactured cheap. H. A. Center St., Waukegan, Ill. COPYRIGHT For sale—New safety collar band for men’s shirts. Most comfortable. Mrs. Louise Compagno, 1759 Oak St., San Francisco. _ aa a4 FOR Sale—Patent on electric door opener, suitable for garage and other public build- gauge; Colby, 419 ings; single or double doors. Very simple mechanism, non-reversing motor, easy in- stallation. Will sell outright. Address The Reliable Machine Company, Anderson, _Ind LISSY Combination try and miter square. For sale outright or royalty. Wm. Lissy, 3502 E. Nora Ave., Spokane, Wash. PATENT For saie on a baih-room spe- cialty. Something to wash and dry your back. Address W. C. Dyer, 2808 Gamble St., St. Louis, Mo. “CASH Or royalty Canadian patents hy- draulic four wheel brakes—for automobiles. Apply W. Armstrong 3515 5th Ave., Regina, Sask. “FOR Sale book rack. recently patented adjustable Fine for hospitals, sanitariums and homes. Johan G. Westerfors, 429 E. 67th St., Los Angeles, Calif. NOTHING Like it, individual marcel waver, curls hair quickly, inexpensive mfg., informa- tion inventor. Amcor, 110 W. 40th St., New York City. —= SALE Or royalty, costumer _ileminated mirror, bearing patent 73576. W. P. Neal, 1335 East Breckenridge St., Louisville, Ky ~~ OUTRIGHT— Patented motorcycle support best offer takes. Clarence Jeske, Walnut Grove, Minn. “HOT Water portable bathing outfit for small homes Elmo J. Bush, 1933 Piggott Ave., E. St. Louis, Il. FOR Sale or royalty. Patent engine oil supply cans; last word in cans Money maker. J. H. Rheney, 2557 Central Ave., Augusta, Ga. and slicer Just leseed. Serial 747626. William J. Donnelly, Weatherly, Penn. “BEST Offer buys Patent 1641849, sani- tary smoking pipe; improved part may be molded or stamped. Raymond Hadley, Fair- field, Conn. __ a “ELECTRIC Hammer, unlike others—more powerful. Reasonable royalty. Patent just allowed; also nut lock pending; ficient. John Karcevsk, 1847 Chicago cheap, ef- Superior St., ~ AUTOMATIC Planing machine for bowl- ing alleys, marble and slatework. Richard Krause, 595W, 178th St., New York City. “SNOW Chains for No. 1,408,388 Winchester, Ky. COMBINATION Motor Truck, concrete and mortar mixer; establishing a new mixing principle and will prove a big money maker to manufacturer. Chas. Payne, 27 Fulton Ave., Waukegan, TIl. “SOLDERING Tron—Feeding wire solder through point with facility of fountain pen, electric or non-electric, the solder magazine automatically sliding back away from heat- ing flame Patent 1631063. P. H. Rogniley, 1404 M St., Washington, D. C SURVEYING INSTRUMENTS GUARANTEED Rebuilt transits and lev- els. All kinds and makes. Bargain prices. Cash or terms. List M-6 gives descriptions. Warren-Knight Co. (Manufacturers of ‘‘Ster- ling’’ Surveying Instruments), 136 N. 12th St., Philadelphia, Pa LARGEST Stock of new and used survey- ing instruments in the country direct from factory. Satisfaction guaranteeed or money refunded Also farm levels. Wissler, 619 N. Broadway, St. Louis, Mo MODELS AND MODEL SUPPLIES DEADEYES—%” 3-16" $3.50 hundred, belaying pins 18e dozen. C. Libby, Tucka- Yy folks. UU. S. Patent Big novelty. Bert Noblette, hoe, WOODS For models, scroll work and in- laying. George Wild, 510 East llth St., New York. BUILD Your own ship model for $4.98 See ad on page 134. SECTION 61 PATENTS. Time counts in applying for patents Don't delay in protecting your ideas Send sketch or model for instruc- tion or write for free book ‘‘How to Obtain a Patent’’ and ‘‘Record of Invention’’ form. No charge for information on how to pro- ceed Communications strictly confidential Prompt, careful, efficient service Clarence A O’Brien, Registered Patent Attorney, Security Bank Building (directly across street from Patent Office), Washington, D. C. See pages 140 and 141. INVENTORS—We build models. Send us your rough idea. Our master mechanics -will develop it for you into a_ practical working model. Thirty years successful ex- perience doing this very thing. Best shop equipment. Expert advice. Confidential service guaranteed. Bank reference fur- nished. Send for free booklet ‘‘The Road To Success.”” Crescent Tool Co., Dept. A, Cincinnati, Ohio. HOW To Make Clipper Ship Models, by E. W. Hobbs, one of the best books pub- lished on this subject. Price $3.00. Fore Y An’ Aft, Huntington, N. COMPLETE Steam plant; %"x” en- gine, boiler, blowlamp, set of boat fittings $27.00. Send stamp for circular. Model Machine Shop, Jersey. ~ MODELS, Tools, Dies and General manu- w. 212 Price St., Rahway, New facturing Logan Machine Co., 652 Lake, Chicago, I. val ~ MODELS, Experimental Work, Light Manufacturing, and Stamping. fFrostholm Bros., Syracuse, N. Y. WE make working models for inventors and do experimental work and carry a com- plete stock of brass gears and model sup- plies Send for catalogue. The Pierce Model Works, Tinley Park, Il. MODEL and Experimental Work at est cost. Wagar Model & Machine Works, 115 So. Clinton Street, Chicago ~ SPECIAL Machine builders, tool and die makers, inventor’s models production work of all kinds. Dept. L. Quality Hardware & Machine Co., Ravenswood and Thorndale Avenues, Chicago, Ill LET Our experience be your guide Mod- els that are models; tools and equipment for economic manfg. Patterns of all types; manufacturing in all branches Satisfaction low- guaranteed. United Machinery Company, Cin- cinnati, 8. A THE Modelmaker, a magazine for ail in- terested in making working models, boats, ete. Sample l0c. Modelmaker, 122 Lib- erty St., New York. : SHIP Model Fittings: Send Dime for booklet A. J. Fisher, 1002 Etowah Ave, Roya! Oak, Mich ELECTRICAL MOTOR Bargains, all new stock from fac- tory, 500 % horse power, 110 volt, 1,750 speed new General Electric alternating cur- rent motors complete cord plug and pulley each $8.75. Lots of six $8.00 Other sizes of motors and generators to 5 horse power at % price Electrical Surplus Company, 1911 Chicago Ave., Chicago. MOTORS—1-6 To % hp. books. Lowest prices Catalogue Manhattan Co., 333a W. Manhattan Blvd., Toledo, Ohio ~ FOR Sale—Burglar and Fire Alarms Daly, 2398 May St., Cincinnati, Ohio FOR MECHANICS SET Eight spiral $10.95. Catalog. W Harrisburg, Penna MANUFACTURING COMPLETE Manufacturing Dies and stampings and Special Machinery. Our En- gineering department will design and perfect your article; our tool room will tool it for production. Our shop will make any quantity you may need. Models made if necessary Barth ens & Machine Company, 3816 expansion Barnitz, 203 reamers srigegs, West 34th St., Cleveland, Ohio SP SPECIAL Machinery or parts, dies, tools, metal specialties, models, special gears, stock gears and model supplies. Send for Catalorcue The Pierce Model Works, Tinley Park, Tl “TO Order Metal articles, models, tools, patterns, experimenting Complete contract manufacturing Parma Engineering Works, Brooklyn Station, Cleveland, Ohio MECHANICAL Problems solved and details furnished I. Gregory, 3311 Ave. H Designs Advise needs Ww, Brooklyn, N. Y

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62 WIRE goods made to order. Cooley Mfg Yo., 530 N. Western Ave., Chicago MACHINERY, TOOLS AND SUPPLIES

BUILD Your own buzz saw. % Arbor $3.00; ball bearing, $5.00. E. A. Pophal Mfg. Co., Wausau, Wis. Builders of bench saws, band saws, lathes and jointers, etc. Ask for catalog. — 30” HENDY Metal Shaper $225. 20x 14° Reed engine lathe $350, 14°’x6’ Monarch lathe, late type, $250. 20°" Kerns Drill Press, $55. No. 1 Brown & Sharpe Milling Machine, $150. 10’ Drill Press Electric Motor $47.50. No. 60 Heald Cyl- inder Grinder $375. 24’’ Fay Pony Planer $175. Air compressor with tank, $37.50. juss 2 Spindle Shaper $125. Terms if de- sired Write for catalog Cincinnati Ma- chinery & Supply Co., 27 West Second St., Cincinnati, Ohio ~~ WOODWORKING Machinery, used and re- $19. 5 hp built stand saws, grinders, jig saws, saw benches, jointers, surfacers, etc. Send for bar- gain list Oliver Machinery Co., Grand Rapids, Mich. WE Sell the imp: ved Roco circulating pump also Strainer Check Valve None better. C. A. Smith Co., 100 Central St., Milford, Mass. START business of your own, small in- vestment required, doing nickel, copper and silver plating This work in big demand Information free Electro Platers Supply Co., 547 Considine Ave., Cincinnati, Ohio 14°” PORTABLE Band-saw, complete with motor, $95.00; 14’ portable dise sander, com- plete, $65.00; real machines Guaranteed. J. W. Maijek Mfg. Co., 30 Front St., Port- land, Oreg. ~ SPEED Lathe $10.50 complete. 7 inch swing, speed cone. Jefferson Mfg. Co., Fairfield, Iowa ENGINES, MOTORS AND DYNAMOS MOTOR Bargains, all new stock from fac- tory, 500 ™% horse power, 110 volt, 1,75 speed new General Electric alternating cur- rent motors complete cord plug and pulley each $8.75. Lots of six $8.00. Other sizes of motors and generators to 5 horse power at

tot % price. Electrical Surplus Company, 1911 Chicago Ave., Chicago ~NEW Battery charging generators, 8 volts

10 amperes, $8.50 110 volts, ampere, $8.50. Westinghouse alternating current, % hp. motors, $7.50 Eight-day time clocks with 20 ampere switch, $6.75 Many other bargains. Queen City Electric Co., 1736 Grand Ave., Chicago, Il. FOR Sale New 6 volt, Boseh starters, $3.75 cash. One Kw. 32 volt, new Westing- house lighting and battery charging gen- erators, $48.00. New 110 volt Vacuum Cleaners, equipped with General Electric motor, $17.95 Satisfaction guaranteed. New Everlite 32 volt, 1250 watt lighting plants at $169.75, complete with engine General Distributing Company, Security Storage Building, Duluth, Minn BARGAINS—Motors, machinery, wass. machine motors, $5.55; % w., $7.50; electric drills, $14.75; electric grinders, $7.45; farm plant motors, $3.15; generators 15.95; electric vacuum cleaners, $8.95 104 other bargains. Send for bargain bulletin No. 630. Acme Tool Co., 627 Washington St., Chicago MOTORS: New General Electric, %{ hp., $11.90; % hp., $27.75; 1 hp., $38.50. New catalog. Special discounts. Motor Spe- cialties Co., Crafton, Penna. BARGAIN Guaranteed, “hp. Robbins and Myers a.c. repulsion type motors, 110-220v, 1,750 speed Only $14 complete Money back if not satisfied Glow Electric Co., 1 East 2nd St., Cincinnati, Ohio “GOVERNORS For all makes of auto en- gines when used by flat or V belt. $10 and up days free trial. Circulars Co., Springville, N. Y., Ont., or Los Angeles MAKE your own—half and one power electric motors. A. C. Induction mo- tor model shows winding connections plain Sicht. Quick easy way. Gaines Bros., Box 481. Gainesville. Texas STEAM Engines—One H. P $12.00 James Chambless, Bessemer, WRITE for bargain catalogs on motors, generators, electric drills, not buy, consult us first. General uting Co., Security Bldg., Duluth, for power purposes. Run Sent on 30 B C-S Governor or St. Catherines, horse- $18.00; %%, Ala. electric ete Do Distrib- Minn.

POPULAR MECHANICS ADVERTISING BENDING MACHINES SECTION

RABBITS THE Famous Hossfeld ‘‘Wrenchless” MAKE big profits with Chinchilla Rab- Universal Iron Bender is the last word in bits. _ Real ,Moneymakers. Write for facts Lending machines. Bends metal, cold or | 852 Conrad’s Ranch, Denver, Colo hot, into most any conceivable shape, in- HONEY ———— cluding Bye Bolts and Automobile Spring PANcy wi - Eyes. Bends up to 1” bars or 1%” pipe > 4 alte Clover Honey an cold. Thousands in use by all classes of pail, $1.00; 10, $1.75. Pay when received trade, from the smallest shops to the largest Agents wanted. Wisconsin Honey Producers, railway systems. Write for circular and Sheldon, Wis. prices. Hossfeld Mfg. Co., Winona, Minn PERSONAL ee BLACKSMITHS FRENCH—Oriental novelties, books: cat BE a Master Mechanic Blacksmith and alog. Sample 1l0c. Marelle Company. 8 Expert Tool Maker and Dresser with col- Madison, Chicago. ored tempering charts. Price $1.00. Val- ~ RELIEVE That headache. No drucs New uable samples free. W. M. Toy, Sidney, method offered first time to public. Oricina Ohio. head compress, $1.00 money order. Good FOR SALE—MISCELLANEOUS for several times use. Goldsmith, P. 09 SDDRESSOORAPES - —r Box 1806, Cincinnati, Ohio d uss Re S. setter olders. WF VTENTY ? ale - a Multigraphs, Envelope Sealers, Duplicators, | 1 VeNTL, Up-to-date beauty prepara less than half price. Guaranteed. Pruitt ‘tr Oe “ihe juaranteed. Box 209, Plain Co., 117 No. Market, Chicago. City, Ohio. _ —-— TOBACCO Or Snuff habit cured or 5 WANTED—MISCELLANEOUS pay! $1.50 if cured. Sent on ria i MAIL us your discarded Jewelry, Gold, Frances Willard, Box 796, Los An Crowns and Bridges, Watches, Diamonds, | Calif , Silver, Platinum and old False Teeth ADVICE, Information, any subj speney ya a f Goods returned coin. Fred Klotz, Reading, Pa if offer refusec Inited States Smelting ~ TOBACCO or Snuff Habit Cured or 1 W — (The Old Reliable), Dept. 71, Chi- | pay $1.50 if cured. Remedy sent on trial cag Superba Co.. N3, Baltimore, Md FARMS AND FARM LANDS MISCELLANEOUS LAND Free if planted to bananas. Ba- LOG Houses. Before building get our nanas bear full crop second year. $5.00 | pian Logs stand upright. — Ea monthly will plant five acre orchard, which cheaper ; “Blueprints heaieniie four should pay $1,500.00 profit annually Ba- ; ' ‘a if lon , f nanas ripen every day, you get your check ace og Ro Tay Br every 90 days. Reliable companies will cul- Blue eke 4053a Mc lee Ave St ote tivate and market your bananas for one- | yy,” oii ee third. For particulars address Jantha Plan- . tation Company, Empire Bldg., Block No s MIRRORS Resilvered at home ( A3, Pittsburgh, Pa. ) cents per square foot ; you charge 7 IDEAL Summer camp, heart of big game rene mental = — peer. vee country, Pike county, Pa., near state road; o a 2 = iat ny "Detai a - * 137 acres, 8-room house completely furnished Sorts kl Pie ey ‘9R8 Mai ‘ t Tn i Ready for you. Think of it! $4,000. W. | Sprinkle. Plater, 288, Marion, Ind 4. Dunmore, Phoenixville, Pa MANUAL Of better locksmithing ~~ATTENTION!

“Get acquainted, cash for your property, farm, hotel or retail store, no matter where located; confidential service. Hayes Business Agency, Cincinnati, Ohio. SMALL Fruit and poultry farms near Los Angeles. Ten years to pay. Send for free illustrated booklets. Fontana Farms Co., owners, Room 617, 631 S. Spring St., Los Angeles, Cal MONEY made in Mich. potatoes $10 down now and easy terms buys land near markets, lakes, streams. Write today Swigart & Co., P-1276, Ist Nat’l Bank Bidg., Chicago, Aig OZARKS — 10 acres near White River and proposed power dam, $100, $5 monthly Alvin Zimmerman, 1802 N. 5th, Kansas City. Kans. eS oe = SELL your property quickly for cash, no matter where located. Don’t pay big com- mission Particulars free. Real Estate Salesmen Co., Desk B. Lincoln, Nebr PECAN-Orange-Fig Groves “On the Gulf’ Monthly payments. Guaranteed care Big. quick returns Suburban Orchards, Dept. M. Biloxi, Miss.

ROOTS AND HERBS OVER 1,000 Varieties medicinal herbs and roots Tested and proved Dime brings valuable recipe book and complete informa- tion. Botanics, 145 West 112th St., Chicago

“HERB Doctor Book—10 cents. 250 re- ceipts for making herb medicine. Hazzard Company, Box 1, Vanderveer Park, Brook- lyn. N MUSKRATS MAKE Money From Muskrat Fur—Raise Muskrats in dry land pens or hutches the facts Get 652, Conrad’s Ranch, Denver, Colo DOGS AND PETS RED Foxes.

Re-stocking, breeding, 3.000 sold since 1921 $15.00 pair, cash with order. Shipping starts May list. Sat- isfaction guaranteed. Earl Farley, Center- ville, Iowa. , ST. BERNARDS. Registered thorobred Puppies from Championbred parents. Prices reasonable, duty free, photos submitted. Helvetia Kennels, 181-P McKenna, Mon- treal. One GREAT The Dane pets. Registered, pedigreed dog. Frederickson Great Cedar Rapids, Iowa. Danes He-Man’s Kennels

up-to-date methods and tricks fully For locksmiths only at $10.00 ther your stamps). Pocket. size Circular McLean, 1656 Lawrence, Denver, ‘ WE Buy or sell war decorations Write for list. Peterson & Wiillia Wis. TATTOOING—Learn how wit! fits. Descriptive circulars sent an my blueprints Send two cent sta Sergt. Bonzey, 367 South Main, Pr R. I. TOYS And furniture easy to build list Address Woodcraft, Box 43 Re $1.00 CALIFORNIA Natural art 50ec *"leasant surprise. Also price Jordan-Ball Art Studio, 975 So. Ar Los Angeles ~ HOMEOPATHIC And Biochen tions sent postpaid to all part world. Manual and booklet free I Bros. Co., 5547 Ravenswood Ave Cl Ill Established 18 | GOLD, Silver, copper, lead, zin 10¢ each Buskett, Joplin, Mo AMATEUR Cartoonists Make n spare time with new cartoon selling Write Smith’s Service, PM1194, W chee, Wash MEXICAN Made Holsters, lariats hair articles; rattlesnake belts Send cents for catalog. Tex-Mex Leather 309 Esperson Bldg., Houston, Te YOU can emboss your stationery as ¢

Perfect work guaranteed, Simple—ir sive. Miller Sales Company, Dept. E ington, Ky PRINT 250 Signs or pictures ar without press, type or machinery Sa and particulars 19c. Straco, 1013, field, Olrio TATTOOING supplies direct from m facturer. Catalogue. ‘‘Waters,”’ 965 ram, Detroit ” WEEDS—Cut_ them with Shaw Garden Tractor. Also plows, « vates and runs belt machinery. Low pr! Immediate delivery. Shaw Manufact Company. Denartment ©. Galesburg. F CUTS anybody can make. Simple process. . Specimens. particulars stamo. M. Dav. Windfall, Ind CASH Paid for Butterfiles, Insects Sinclair Display Advertisement on page cutter bar Spri: SI

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POPULAR MECHANICS ADVERTISING SECTION 63 | $6Qg-°° aDay! With Four New Amazing Plans and SUCTION GRIP ASH RECEIVER VES You can make $60.00 a day. My men are making that much and more right now!—with the handiest specialty that has struck the field in years. The Patented MASTER SUCTION GRIP ASH RECEIVER—absolutely new and practical—a marvelous little invention which holds to any surface, metal, wood or glass, by means of a SUC- es, lla Rab. for fa ts 4 nace NEW TESTED PLAN GETS ORDERS FROM EMPTY CARS! 1.00 for rhis plan is entirely new and different. The TION GRIP. A brand-new Brock Mailman brings you the orders with cash in- and practical idea in Ash Re- Loui sed in every envelope. We have originated ceiver design No screws, no holes to bore, nothing to hurt the furniture or wall to which it is attached. Just press it on and it stays on. Comes off ina jiffy for emptying. Just what the auto owner needs on the dashboard. Keeps car clean. A new self-selling, mailing envelope which is marvelous for getting orders by mail. The cir- . - jlar and envelope is all in one piece. All the Res purchaser has to do is to sign his name and ad- . r dress, inclose remittance, fold the circular into an envelope, and mail it These circulars offer the Master Suction Ash Receiver to auto owners with a surprise FREE PREMIUM—the com- bination for $1.00. We furnish these circulars STICK IT ON AND The Sale is Made! ali ( and imprint your name and address for a small wonderful convenience and protection, complying with the automobile er . charge. You don't have to see the prospect or fire laws. . urs ¢ make sales talk! These clever auto circulars Mas Rn ae bs : do all your selling for you They are distributed I aster Suction Grip Ash Receivers are ideal for homes and offices. Made of in empty cars parked in streets or in garages, or everlasting Bakelite, in Black, Brown, Red, Green and Mottled A‘ color to are mailed out to prospective customers. harmonize with every interior.: Can you visualize your vast market and un- y of our men have school boys distribute the limited sales possibilities for this new and novel Ash Receiver? Auto Owners, ilars for them while they are out on the fir- Homes, Offices, men and women everywhere are your prospects. Priced so ng line selling in quantities. You will make a ridiculously low you sell two or more at a glance. nyw profit of $50.00 to $75.00 for every thousand cir- = o7 or ‘ for ( Jars you distribute. Your earnings are only Sells for 73¢. You Make 100 /0 to 200°%, Profit , nite’ OF jou distribute, the more you can make EVEN ON DEALERS SALES— The Only Proposition of Its Kind in the World It is the most original, easiest and the greatest = Selling-to-Dealer Plan Puts You in a Big Paying Repeat Business id fr stunt in the history of direct selling. Full details This plan enables you to build a steady income by distributing the Ash Re- I {this amazing, revolutionary plan will come to you ceivers to dealers in your community. You call on Garages, Accessory Stores, with your order for one dozen or sample. Filling eae — Stores, General Stores, Drug Stores, Tobacco - . e Stores: in fact, nearly every store along the street is a good prospect Every ce Exclusive Territory to Producers dozen Ash Receivers in assorted colors is packed in - Readoomne self-selling irc Now is the time for you to get into this Master counter display box—a powerful silent salesman which catches the attention of Ash Receiver business, because as soon as you show everyone who comes into the store It is so attractively illustrated as to make s that you mean business, we will protect you in as any person see at once where several can be used conveniently for either the Auto . ich territory as you can handle. You can still Home or Office Keen merchants are always on the lookout for fast-selling reap the many advantages of getting in on the specialties, and they realize at a glance that this product is a self-seller, and is so I ground floor of this whirlwind seller. Wise sales- attractively displayed that it will sell over the counter with no attention from th« Ut with or without experience, men who are ac- clerk. Any dealer will be glad to place it on his counter and make a handsome med to big money, and men who have the profit. This is a genuine opportunity to enter a big-paying repeat business of ambition to earn big money in a business of their your own. Our other plans outline a sure way of making big money selling t own, are all making application for territory. This consumers, to dealers in quantities and getting orders by mail s the chance of a . fetime, and you W don't risk a thin cime, as we guare SEND $4.50 for SAMPLE DOZEN NOW! Make $4.50 Profit in Less Than Half Hour es to re- mmediately Suction) Ash Receivers at our ¢ price of $4 f id your -~ Ste at - song =A r ake orders fr« ~—ay b. nd f money for U Or we refund y« © great power of this pla er ( the dozen article we are sure you w eger orders your discount ie naturally bigee absolutely and so is your profit. Send $ ach a dollar bill ($1.00) and we'll ship the doze ° mptly C.O. D. for the balance ve complete selling i tione and all details of r selling plans e at you'll know exactly li you want a samp nly, send 50c with cous nex (stamps will d and it will De mailed to yous B, I : . = Fill In and Mail Coupon Now!!! Banas GORDON MFG. COMPANY Spr , 110 East 23rd St. Dept. NF-9 New York City m "Et . oe ": : GORDON MFG. CO., Dept. NF-9, 110 East 23rd Street, New York. + bar on I enclose $ ; F , for which please send me order checked below: H o [ One dozen Master Ash Reccivers, in self-selling counter display carton. § pri Price $4.50. (If $1.00 is enclosed, send one dozen for the balance C.O.D.) 4 eturing { }] Sample Master Ash Receiver. Price 50« Stamps will do.) Please s K include full details of all your sure-fire selling plans which guarantee that I will & make sales. H . $ NAME 4 Place this “Self Sell- ADDRESS : , ing’ DISPLAY CAR- : TON on 20 Store TOWN STATI : Counters and Make A DAY References: Bronx County Trust Co., New York : PROFIT Manufacturers Trust Co., New York. : . hee = ost

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64 POPULAR MECHANICS

HYPNOTISM. to Gain Popularity... ; Success,, Big Money. TOW the amazing science of hypnotism will help you win the big learn the secrets of which enables you to make you—to overcome bashfulness—to strengthen your memory, and will power—to realize your ambitions magnetic personality and gain control over others! In book, written by the most famous hypnotist in the told exactly how the great ope given all the facts and methods that are edge of the practice of Hypnotism - things of life that strange subtle powe! now you can world you are rators handle their subjects Hy pnotism— others love mind to develop a strong, a startling you are necessary for a full knowl-

Learn How to Influence Others Can you sway others—can you make Mysteries of them follow your suggestions, adopt 4 your plans? Are you making enough Hypnotism Revealed money? Is your personality strong How to Hypno- enough to cope with others? Are you perfectly at ez » be fore an audience or among strang< row through this wonderful pook you c an, if you have an m tize at a Glance How to Make Others Obey You How to Over-

active and intelligent mind, quickly come Bad Habits develop yourself into a cultured mag- Magnetic Hea!- netic person who will be admired and ing envied by everyone Agency of Death This amazing book was written by I Methods of In- W. de Lawrence, one of the greatest ducing Hypno- hypnotists that has ever lived In tism F simple, clear, forceful terms he tells all How to Wake a about the theory and practice of Hypno- Subject tism — he explains the _ psychology, Duration of Hyp- history and philosophy of Hypnotism, notic Sleep — Prepared especially for self-instruction, this is the only Practical Course in Hypnotism, which starts the student out upon a plain, commonsense basis. Send No Money —5 Day Trial For a short time we are enabled to offer this great book, Hypnotism, by de Law- rence for only $2.50—the lowest price at which scientific, technical books of this kind have ever been sold. Send no money just fill out and mail the coupon below When the package arrives pay the post man $2.50 plus a few cents postage. In spect this revealing volume for five days. then if you are not delighted return it and your money will be refunded. Get the coupon in the m: all this ins ti ant we have one a limited edit price. FRANKLIN Pt BLISHING “cO., Dept. G-70, 800 N. Clark St. ,€ thicago. ———— oe ee ee | Franklin Publishing Co., 800 N. Clark St., Dept. G-70 | Chicago. Susceptible Sub- jects Methods of Fas- cination Snake Charms

Please send me a copy of a pr m by L. W. de Lawrence. Wher package J arrives 1 will pay postma s few cents postage. if not delighted I am at liberty to return the A. me within five days and my money will be Te- | funded | Name l 1 | City a, U2 you Rive outelde t Address State S. send cash with order

ADVERTISING SECTION Learn in 10 to 12 Weeks at the “College of the Air" “Book learning’ is essential in some studies—but can't learn to fly by studying a book The Marsh Flying School takes you right up into the sky in dual e ~ trol planes with expert fliers. You, too, are a filter when you jinish this course. $400,000.00 Worth of Equipment An immense airplane factory—numerous other buildings— a new lighted four-way field—a dozen or more new planes expert instructors of outstanding ability:—These are some of the advantages awaiting you in Marshall We are affiliated with Nicholas-Beazley Airplane Co., Ine FREE! ACT QUICK! To maintain our high standard, we n raise our tuition fee. Write now for attractive FREE catalog, telling how can, for a limited time, still enroll at old rate! Be a flier! Don't hesitate ew” Write for this big FREE book today.

LL FLYING SCHOO S'HA 630 N. ENGLISH ST MARSHALL MISSOURI! TELEGRAPH-RADIO Operators earn $150 to $350 month and up. Learn in Chicago or at home. Chance to work while training. We furnish operators to U.8. Govt., Railroads, Com’! Cos., Broadcasting Stations and Ships CHICAGO TELEGRAPH INSTITUTE, Dept. 1-6-8, 1338 So. Michigan Ave., CHICAGO, ILL, ANT WORK .4<é..? Earn $20 to $50 a week retouching photos—men or womer No selling or canvassing. We teach you at home, furnis working oy: and omnez ment service. WRITE TODAY RTCRAFT STUDIOS Dept. 50.” 427 Diversey Parkway,

Chicago

NEEDED FOR RAILROADS Nearest their homes—everywhere—to train for Firemen, Brakemen; beginners $150-$250 monthly, Promoted to Conductor or Engineer—$3,000-$4,000 yearly—highest wages on railroads. Also clerks. Railway Educational Association, Dept. D16, Brooklyn, N. Y.

JIMMY DeFOREST course Teaches by mail the Same System he taught Champion JACK DEMPSEY In 20 weeks, under the sates 4 ene. DeForest, ey D's ; TRAINE AND MAKER OF CHAMPIONS, you will master the riceless knowledge that made Jack Jempsey his millions, and fortunes fora host of other Jimmy DeForest-trained ring stars. Boys who were once rank amateurs are today earning big money; weaklings have been made strong, cour- ageous; men have learne d the art of self-defense. the now famous book, “THE GOLDEN AGE OF BOXI? greatest book of its kind ever written; full of valuable information, photos of © fighters and <i who became successes over night. Enclose 10¢ to cover cost ing, eto NOW. JIMMY DeFOREST BOXING COURSE 317 Madison Avenue, Box 131, New York ‘ Send toda

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10 go or at ‘tors to i Ships, AGO, ILL, ss en ish ¥ = f great { ¥ SE ‘UN on 20 Store i nrg s TOWN STATI H Counters and Make A DAY : References: Bronx County Trust Co., New York : . Manufacturers Trust Co., New York. H ben ae POPULAR MECHANICS ADVERTISING SECTION 65 SHOP NOTES 500 ~ a 400 . Articles 1 928 Pictures This announcement will be welcomed by thousands because they have learned that each yearly issue of Shop Notes con- tains dozens of short cuts that save time and money. Every article is written by some man who has tried the idea and found it worth money. The variety of subjects covered is one reason why so many buy Shop Notes each year. ways the 1928 issue surpasses previous numbers. The follow- ing brief list will give you an idea of the variety of subjects covered. SOME OF THE SUBJECTS Art ficial lee Making Pottery Gheseing ing Killing Moths in Furni- picts kee - - Moti Flagstone Walks Carpentr Automobile Repairing Plaque Making Machine Shop Work Culvert ork Refinishing Boft-Wood Farm Mechanics Automobile Repainting joors Tuol Repairing PortableSewing Machine Making a Pirate Chest Lock Repairing Hot-Flame Blowpipe Homemade Apple Wiper Key Making Automatic Fire Betting Window Glass Conerete Work Extinguisher tching B Cc Cutting Your Coal Bill jaws Mower Bepeiving - a a 75% eautify in, our Home i i i pore 2 _ ° Making a Bewing Cabi- t pressor net GasolinePumpExtension Glue and Ite Use Log Cabin Construction Proper Hot-Water Heat- Power-Line Pole Folding Bed for Road. erl lat Straightening Cutting Glass ~ 000 Ideas onalishop Work There are now 16 vol- umes of Shop Notes available. And this unrivaled library of shop helps may be had for a spouse price of $6.25. If you do not have the back numbers of Shop Notes, you should pur- chase the entire library. The Cer are now available: 1908, 1912, 1913, 1914, 1916, 1917, 1919, 1920 1921, 1922, 1923, 1924, 1925, 1926, 1927, 1928 y H PROFESSIONAL’S Amateur’s Guide ""?iNosoox Hoth amateurs and professionals find Shop Notes of wonderful jue. The articles are so clearly written and so thoroughly istrated that even a boy can follow them. Teachers of Manual Training should have the complete library. SEND NO MONEY Don't send a penny. Just fill in the coupon with your name and complete address, indicate whether you want the whole library or the special offer of 1928 Shop Notes and Lathe Hand- book for 98 cents. When the books are delivered to you, pay the postage and deposit price of books with postman. -— —~—— SPECIAL OFFER COUPON -——— POPULAR MECHANICS PRESS | 200 E. Ontarioc St., Room P1, Chicago, ih. j | | Send me, as per your special offer the following books. I will pay postage and the price of books wuen-they arrive. My money will be refunded if I am not satisfied. (Check what you want.) ] 1928 S. N. and Drilling and CJ Complete Shop Notes | Thread Cutting, 98¢ Library (16 vols.) $6.25 Poultry Appliances , Plumbing Rinks Electrical Kinks Street and No. ATETET TT ‘ oes State | ame | CET INTO AVIATION Take YOUR place, now, in the business of air navigation. Either as ground expert or flyer, the field is wide. Get thorough practical training NOW,—an intensive course under experts, at this old established School, the ‘Michigan State.” se” NOW MEN NEEDED 20 Trained service men required to every flyer Experts on plane construction and maintenance—with thorough knowledge of planes and motors—are in greatest demand. Air and ground training under army and navy trained ex- perts will fit you properly. Seventeen years of training backs this Air Course. It is complete, intensive. It covers GROUND WORK, Engine and Plane Design, Construction and Repairs, meteorology and navigation. FLYING, Including Solo Without Bond. government approved planes. The course prepares you for Dept. of Commerce examina- tions, and gives you practical training for actual ground work, and flying Here at the Michigan State we SPECIALI of a few “hourly lessons” we give 132 HALF DAY sessions You get thorough ground traiming bere Write today for complete detaile of Opport “Michigan State” training. MICHIGAN STATE AVIATION SCHOOL Affiliated with Michigan State Automobile Sc New, Modern, ZE in ground instruction. ‘ Instead over 400 hours in ali unitiee in Aviation and practical Established 17 years. A. G. Zeller, Pres. 3706 ese*% ~— ow codward Ave , Detre it, Mich —_— —«—« : eusseee** . eoscussete® s —— mv! | Ww an t . A. G. Zeller, President 4 MICHIGAN STATE AVixTION SCHOOL, tO Know : 3706 Woodward Ave., Detroit, Mich. . Send me at once the details of your Aviation Ground and Flying Courses. I ez- : . pect to come to De it at 4 : Name 4 : Street and No. or R. F. D s . City and State . 4 se TTrrririitfitittttt

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t | fighters and + FE NOV Decame successes OveT night. #nciose ive vo cover com —_ etc. W JIMMY DeFOREST BOXING COURSE 317 Madison Avenue, Box 131, New York City City State a If you live outside U. S. send cash with order we ee ee ee ee ee 66 POPULAR MECHANICS ADVERTISING SECTION mo DRAWIN you have natural ability to 4 1w—which only a limited number pos- sess—develop it through proper training for a career as a Commercial Artist. Many Federal Students are earning $2000, $4000, $5000. and $6000—some as high as $10,000 and $12,000 yearly. The right training can save you several vears’ time, and bring you quickly to a worth while income. The Federal School has won a reputation as “the School famous for successful students.” The Federal Course is practical from A to Z, and gives you personal criticisms on your lessons Send today for book “YOUR FUTURE” giving all the facts about this fascinating home-study course. FEDERAL SCHOOL OF COMMERCIAL DESIGNING 634 Federal Schools Bldg. MINNEAPOLIS, MINN, uur Free Questionnaire Send me y¢ Name... Address..... eles Be an electrical specialist. Gain quick success in this most fascinating and prof- itable field. Learn at National in the center of tremendous electrical projects costing more than $100,000,000.00 — unlimited opportunities now. Practical, intensive training by National’s job-ex- perience method in 6 to 9 months. All technical essentials included. School endorsed by leaders in electrica] industry. You learn all branches of elec- tricity; radio. Million dollar institution; all modern equipment and training facilities. Life scholarship. No age limit, Free employment service. Over 17,000 successful graduates. 23rd year. Big illustrated 84-page cat- ° alog sent FREE. Write today. * NATIONAL FLECTRICAL GCHOOL Build Your Own Boat New, revised Boat Book contains approved plans and instructions for building 14 different popular types of craft as follows: Rowboat for Outboard Fishing Sleigh and Boat Motor Long Island Scooter Canoe Portable Folding Boat Speed Boat for Outboard Convertible House Boat otor and Camp Portable Canvas Boat Sea Gull Fast Motorboat Pile Driver Punt Cabin Scow Driven by Inexpensive Motor Boat Auto Engine Power-Driven Catamaran In addition to the above there is much valuable informa- tion on: Boat Trailer for Auto Laying Up Boats for Winter Boathouse etching Your Cance Making Boats Watertigh Handling OutboardMotors pwintios Resairn pent ainting, Repairi et Fitting Outboard Motors etc. aii ea anata Auto Tourists’ Handbook This offer also includes a copy of our valuable Auto Tourists’ Handbook which gives 133 practical plans for camp equipment, stoves and fires, homes on wheels, beds for car and camp, lug gage carriers, tables, | try boxes, making and im- proving tents, portable radio, repairing tires, get ting out of mud, carrying food, making camp, camp cooking, chairs and stools, car repairs, roads and land marks, etc. Both books for 98 cents Pay postman price plus postage when he hands you the package. Popular Mechanics Press Room P6, 200 East Ontario St. Chicago 4006 Figueroa St., Los Angeles. Calif. Send me the big, FREE National Electrical Book that explains everything. Don’t Be Afraid To Tackle That Concrete Job! What is it you want to make out of concrete? A Garage floor—Garden seat— Bird bath—Anto Drive-way Curbs and Gutters—Flower boxes—RKaural Mall Box Post— Garden Fountain—Ornamental Poo!—Priaking Foantain— Boat Landing —Cistern Cap -— Milk House — Engine Foundation — Watering Trongh—Sidewalk— Steps—Gateposts—Fence Posts —Tile— Block s—Silo— Pedestal —Vases—Forge —Smokehouse— Chimney Cap—Horse Stalls Foundation Sapport—Cycione Oellar. With the instructions found in Popular Mechanics Con- crete Handbook you can make 173 different useful articles. Build With Ease for Permanence ana Beauty With the Concrete book we send you another remarkable book called Home Mechanics. This contains 329 valuable discoveries for doing the various jobs that come up about every home, both in the house and outside. These articles cover Furnaces, Stoves and Fireplaces— Homemade Fur- niture and Repairs—Building Refinements—Home Shop —Home Plumbing—Kitchen Equipment—Devices for Men—Home Electric Work—Outdoor Work—Water Supply —Garden— Bees— Miscellaneous Simply write and ask us to send you these two books. When postman hands you the pac Kage pay him 98 cents If outside U. S. remit when ordering plus the postage and include 15 cents extra for mailing. POPULAR MECHANICS PRESS CHICAGO Room 606 200 E. Ontario Street

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_— at S and f craft oat t Boat oat aran Orma- ‘inter ight eaks, ok Auto ns for toves heels, , lug- pan- d im- able get- rying camp tools, land- ents. plus 3 you Press ‘io St. --—4 City 5 City and State al > 3 se PPTTTTTiTT TTT ttt POPULAR MECHANICS ADVERTISING SECTION 67 Brand New Money Maker country. AUTOMOBILE TYPE ype of the Dispensador is designed to clamp on the stee ring post of any automobile. No | pro- 1as heretofore been made for ‘‘smokes”’ for edriver. Now he has one always at hand. No package to open, no reaching for pockets, but a whole package available, one at a time. Twenty Dollars a Day The average man, the casual salesman, the man who only wants to make a little extra money, can easily make $20 a day selling this newest of aJl smokers’ de- vices. The Dispensador is a combination humidor keeping cigarettes always fresh and moist) and dispenser. A turn of the knob gives you one ciga- rette, no wrinkling, no breaking, no loss of tobacco. It is an ideal smoker’s accessory that will commend it- self to anyone, and any man who has the tiniest ability as a salesman can make a lot of money showing them. No sales talk necessary, no arguments are needed. T Just show the Dispensador and take your profits. Holds Full Package of Cigarettes And Delivers ONE At a TIME The advantages of this newest smokers’ accessory are 80 apparent that a salesman never need do more tha in show it. It is beautifully finished in colors. ou have your choice of Chinese Red, Apple Green, ench Blue, Grey, Bronze, Roman Gold. In it ciga- rettes are always k fres} i aay afer 9 AGENTS Cash In moistener in one end They can’t break, and a touch on the knob de- Cash in on this great livers them, one at a | offer! Be the first in your me territory to present this lightning seller to the people of your town or your county. Smokers buy it on sight and the liberal profit guarantees sample offer made to you a big income. Take ad- gents. Almost everyone has vantage of the freesample offer, ttle time to spare and can send in the coupon today e extra dollars this easy Don’t wait for someone else to get the cream of this business. NORLIPP COMPANY 568 W. Congress St. Chicago, Ilinois Even if you are not rested in selling them, r two for your own use, e for your car and one for r desk. Simply send the mn and take advantage of “Sell Every Smoker” Millions of cigarettes are smoked daily. Practically everybody proof of the biggest market for salesmen in the uses them. This is Something new for smokers is bound to win and while it’s new and whi'e there is nothing else like it, the Dispensador, a brand new de- vice, is selling like hot cakes. tunity to learn more about it. business which is coming in. men who should make $10,000 this year Don’t miss the oppor- Get your share of the Be one of a hundred Biggest Opportunity in Years Not once in ten years does an agent have an opportunity to grab something new, something startlingly different, with a practically unlimited market. Millions of smokers will welcome the I Jispen- — as a long felt want, will appreciate its utility and admire its peauty. This type is made to stand on the desk or table, and has fixed rubber cushion feet so that it cannot mar the finest surface. One Free rove the value of the Dispensador and its quick selling G m4 es, we give you a salesman's sample free, if you send for one for your own use. The Dispensador selis regularly for only $2.95, but you need not send a nny, just your name and address and we will mail you rromptly T Wo Dispensadors and you deposit with the postman, eo 9 and BOTH OF THEM are yours to keep. You will begin to abe orders the day you get yours. Wearesureofthis. Begin making money now, send in the coupon today f—————USE THIS COUPON —————, ps NORLIPP COMPANY, . Congress Street, Chicago, Iilinois, DEPT. 1A8 J You may send me a Diepensador at the price of $2.95 and include one will pay the postman on delivery, with the understanding that, if lam not per | fectly satisfied in every way, | may return them and get my m oney bac k | an you refer you may enclose $3.00 with thie coupon and twe Cnenren will be = pa Note:—Check here for color and style wanted rr Type Red Blue Green Grey Tuscan Bronze R Gold Desk Type Pome ° ; SE ee ee ee State I as sa cata “alts Sd: “aniss Seu “sta ‘ents dein ‘cies com> ess mis Gash Sins am eens

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68 POPULAR MECHANICS ADVERTISING SECTION

They make *6,000--- The facts prove that YOU can achieve Success in Radio Radio News writes us: “In looking over the dealer mail received in the last three months, we find that the average income of all dealers who gave us their income figures, | 38 in number, averages more than $6,000 4 year.” {Signed} C. W. EMERSON RADIO NEWS Why don’t you think this over and say to yourself “These dealers are no smarter than I am. If I knew radio thoroughly, I could make that much and more. I know that Radio Institute of America is America’s oldest radio school — gives the finest radio instruction obtainable and the finest and fullest radio equipment. “I know that RIA is sponsored by the Radio Corporation of America, G-E and Westinghouse—that their course covers operating, broadcasting, in fact everything in radio. I can get this instruction at home, and prepare for success in radio withoutgiving LY my present job. I can study when { please and as long as I please. I certainly can’t pass up this opportunity to Ant. more about the RIA course. Here's one coupon I will clip. I want the full facts.” Tear out the coupon and mail it now. RADIO INSTITUTE OF AMERICA, Dept. P-6 | 326 Broadway, New York City

BIG DEMAND EASY-FASCINATING-PROFITABLE Learn to fly by wiying and by actual work on motors and ships. Free em- mPIL '@) ag ployment assistance while learning and when competent. Write for FREE copy “Air Facts.” COMMERCIAL AVIATION CO. Dept. T, 329-37 E. Pershing Rd., CHICAGO, ILL. KNOTTING AND SPLICING A new book for every man who ever uses ropes, *‘Knotting and Splic- ing’’ tells how to tie and splice all kinds of knots—from simple and useful to more fancy and intricate. Illustrated with 208 Engravings Your money refunded if after examination you find that it is not — <b, you want. Price 75c. rite for Free Cataten,. ave McKAY co., 604 So. Washington Square, Dept. 26, Philadelphia,

Special 48 p. catalog “S""—Show Card and Sign ter’s supplies. —— catalog “A'’— Art Sup- plies. Save Money—write— BART SUPPLIES, 508 | Eustis Bidg., MINNEAPOLIS, Minn FOY’S BIG BOOK, in Colors A complete guide to successful Poultry and Squab Raising. Low prices on CHICKS, Breeding Stock and PIGEONS Wrtte Today! FREE! FRANK FOY, Box 18, Clinton, lowa

Make Decorative Metal Articles Pictures and instructions for making: book ends, desk sets, jewelry, desk clocks, drawer pulls, hinges, bookmarks, stationery rack, candlestick, letter holder, whisk broom holder, and many similar articles. Send no money Just write a postal for “‘Metal Work and Etching”, our 83- page book. Pay postage and 98c to postman. Popular Mechanics Press, Room 710, 200 E. Ontario St., Chicago, Ill.

up-to-the-minute instruction make it ea

DRAW CARTOONS sexe Cartoonists earn from $50 to $250 per week—some even more. System of Drawing teaches you in half the usual time. world are enrolling for this ee -~ ey - Send for interesting BOOKLET and SAMI PLE LESSON PLATE explaining full details of the Course and what National students are accomplishing. The National School of Cartooning, 623 Penton Bidg., Cleveland, Ohio Remarkable Circle Students from all parte of the Personal criticism service and for National students to attain success. No salesman will call.

A Gibson Ukulele will bring you peotetey and fun this summer .at home...incamp...on the beach. Rich harmony, sweet melody, music withaswing, that png And so easy to play; fun from the start. Gibsons are today's most popular instruments. You hear them on the air and on records; choice of the world’s famous artists. SEND COUPON for free liter- ature and details. Mention in- strument: Ukulele, Ukulele- Banjo,Mandolin,Guitar, Banjo

Gibson, Inc., 603 Parsons St.. Kalamazoo, Mich. Please send free book and de- tails of payment plan on

(Instrument) a St. or R.F.D.........

Simplified Radio Blueprints Blueprints for the most popular sets described in Pop- ular Mechanics Magazine can be obtained for a charge just sufficient to cover the cost of production and mail ing. The sets for which blueprints are available are Three-Tube, Loud Speaker, Loop Nee Dec. 1926 — 25¢ Three-Tube, 15 to 550 Meter Set Nov. 1926 — 25c Four-Tube, Loop Set, for Car or Home Aug. 1926 — 25¢ Six-Tube, Portable, Loop Set...... June 1926 — 25c Electrolytic B-Eliminator........... Feb. 1927 — 25c¢ Non-Radiating Unit May 1926 — 25c Simple Tube Tester and Chart July 1926 — 25¢ New Pertect-Tone Six ; 1927 — 25¢ Two-Tube Loud Speaker Set. . Oct. 1927 — 25¢ Economy Nine Superheterodyne; Sixty dollars bulids this Super. Complete drilling templates and blueprint PI, canna satinss copesscccetes Nov. 1927 — 50c Loop Set for Cabinet Speaker....... Dec. 1927— 25¢ Aero-Dyne Six Receiver.... ........ Jan. 1928 — 25¢ Homemade A-Battery and Charger. Jan. 1928— 25¢ B-Eliminator for Direct Current... Feb. 1928 — 25¢ Screen-Grid Special..............+.-- Feb. 1928 — 50c Fifteen Dollar B-Eliminator........ Mar. 1928 — 25¢ Short-Wave Converter.............. Mar. 1928 — 25¢ AMq-Biestrie Five, ..0.20cccccccveses April 1928— 25c Three- Tube All- Wave Set............ May 1928 — 25¢ Push-Puil Power Amplifier and Power EE Wi Rcccacstecacchdccestaents June 1928 — 25¢ Address the RADIO DEPT. Popular Mechanics Magazine, 200 E. Ontario St, Chicago Back numbers of the magazines describing the construction of the sets can be obtained from our Circulation Departmen , price 25 cents each.

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= cles ends, inges, , whisk money our 838- cago, Hil. POPULAR MECHANICS ADVERTISING SECTION 69 A ENTS.. SALESMEN.. SPARE TIME WORKERS AND CAR OWNERS BIG MONEY! Earn‘Z5 to‘100 In a Week! Show This Amazing Little Gas-Saving Invention to Car Owners.. Easy Sales, Big Profits RE’S your oppor- tunity to make big i money! A revolu- tionary new auto inven- tion has now been pat- ented. Its purpose is to save gasoline . . . to keep carbon deposits down to a minimum ... to elim- inate spark-plug trouble, and make engines run bet- Just show this amazing device to friends who own cars. Let them test it without risk on their cars. The Stransky Vaporizer is guaran- teed to save them 25% to 50% of their gasoline and make the engine run smoother—OR COSTS NOTH- ING! You don’t have to do any selling—the Stransky sells itself—on results! OVER TWO MILLION ALREADY SOLD This simple device is today one of the most successful automotive in- ventionsin history. Over two million wrench. 90% MORE MILEAGE “I have used one on my Ford for over five years and have traveled over 35,000 miles. Never had any spark plug trouble. Have averaged 28 to 30 miles on one gallon of gas. I was getting close to 20 miles on ne gallon before I installed the Stransky.” J. H. Alruth, Iowa. FITS ANY CAR IN FIVE MINUTES ter! Anybody can install a Stransky Vaporizer. Simply loosen one connection to the intake manifold with a The rest you can do with your fingers. Read the who have the intake manifold. : 4 ner, C. J. Aulick has won a of less gasoline and a cleaner, sharper ek for $100.00. MeL explosion. Thus pickup is faster, Vought got $40 extra. GC. O . . Carlson won a Chrysler Coach power and speed are noticeably in- by selling 5,000 Stransky creased. Starting is not interfered veserens 0 lees Cas four ° . . nonotns with—the vaporizer automatically shuts itself off when idle. It has nothing to get out of order and should outlive the car itself. Act quickly. Now is the best time to get started making money. Mailing this coupon for full information will not obligate you in any way. Tearit out nowand mailto J.A.Stransky Mfg. Co., G-10 Stransky Block, Pukwana, S. D. car owners have bought after testing it. Vaporizers are sold and used all over the world. letters Stransky representatives. Learn how thousands of enthusiastic car owners installed a Stransky praise it. We have over ten thousand Ss E letters like these- ones pour in every day! cess EASY TO INSTALL The Stransky Vaporizer attaches to There is a special model for every make of car. It is based on the principle of creating more thoroughly vaporized gasoline. Thus you get more compression out Stransky Wins A Chrysler and Makes »°157 in One Day Herrick, Portland, Oregon, writes: “I am very much pleased with my suc- I sent in my first order for two vaporizers in Decem- ber, 1923. Now I am order- ing in lots of 400 to 800 ata time The largest one day sale I have made netted me a profit of $157.00."" Mr. Her- rick also won a bonus of a new Chevrolet car from -and new Win Free Bonuses R. W. Johnston has won a free radio, as has B. T. Tratt- Mail Coupon For Full Details!

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70 POPULAR MECHANICS ADVERTISING SECTION

$2,500 Reward For the Capture of An Unknown Man 'WICE he had entered the St. Clair Mansion. What was he after? Who? What wasin danger? Berteau, the famous detective, had warned St. Clair that the mysterious marauder would come again. now—a noise in the passage! The creak of an opening door. Ashotinthedark! Acapture! Is this wounded stranger the mysterious intruder? Who could tell? Yet Berteau identified the man without hesitation and won the $2500 reward. How did hedo it? Easy enough for the Finger Print Expert. He is the specialist, the leader, the cream of detectives. Every day’s paper tells of their won- derful exploits in solving m us Crimes and convicting dangerous . More Trained Men Needed The demand for trained men by governments, ions, and private be- _ here is a real opportunity for Y Ge Soneinn more fascinating line of work than this? fen life and death depend on print evi- dence—and big rewards go to the expert. experts care segulariy trem 08) 000 to $10,000 per year. Learn At Home in Spare Time And now you can learn the secrets of this science at home in your spare time. Any man with common school educa- tion and average ability can learn Finger Printing in sur- prisingly short time. Free The Confidential Reports No. 38 Made to His Chief Write me today. Have me send you my Free Book telling what - have done for others—men just like you. Yes, and if I hear from aon rig rome pase ru also send you FREE—the i R Secret Service tor No. 38 Made tc to tis wad Send for big free oA. of low prices and — Terms. Mail coupon NO University of Applied Science Dept. A-135 1920 Sunnyside Avenue, Chicago

UNIVERSITY OF APPLIED SCIENCE Dept-A-135 1920 Sunnyside Avenue, Chicago, Ill.

Gentlemen :— Without an | obligation whatever, send me your new, full . oT FREE book on Finger Prints and your copy of 88’s report. Also your Low Prices and Easy Terms. Ric dco cescscccecccccccesscepsaveveccocovensensseesbenstesosecess BOBIEED cecccccccccccoccccecgocccccccccsescocccccccccccococeccsscces E Esuumeremsnosesensnoenoneeoeconceqeensnooeconsooeees AGE. nc ccsenes

A BIG BOOK ON =A BIG SUBJECT NE DYKE’S Aircraft Engine Instructor Air travel has arrived. Thousands of planes carr precious human lives are propelled by intricate, compli- cated engines that require constant care and attent Only a few men have a working knowledge of these engi The industry needs men who know engines, accessories instruments. That is why the manufacturers assisted A. L. Dyke, emi- nent gasoline engine expert in the preparation of this first real, up-to-date book dealing exclusively with modern a craft engines. “~ Wright Corporati builders of t ne far “Whirlwind”’ eng say of this book, *' feel sure it will meet th: demands of the laymar much better than our own instruction boo! Master charts in colors in effect, take engines apart and enable you t study the many pic Information given = A

Time, Labor and Money Saving Ideas for Auto Repairmen 334 Valuable Discoveries made by Hundreds of Auto Mechanics are con tained in our Automobil Repairman’s Handbook. 337 Illustrations......Price 50c

301 Ways to use drills drill presses, taps and dies with more effective- ness are given in our Drilling and Thread Cutting Handbook. 298 Illustrations......Price 50c 259 Kinks furnished by 106 of =

the most successful Lathe Operators are found in our Lathe Handbook. 212 Illustrations............... Price 50c These three books (regular $1.50 value) are offered for a limited time only for 98 cents plus the postage. Pay postman when he delivers the package. If outside U.S. send remittance and include 15 cents extra for postage. POPULAR MECHANICS PRESS Room 604 CHICAGO |

200 E. Ontario St.

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[= = POPULAR MECHANICS ADVERTISING SECTION 71 Button Rupture Newest Way | Without Pressure] CIENCE now advises discarding cruel steel springs, barbarous leg aren, ane other har- ‘ ness that press against the rupture and thus prevent nature from healing it. A new sensible method has been perfected, after thousands of opt Le ee called Magic Dot— entirely different from any other way. Instead of ‘‘pressing’’ **seals’’ rupture, and course allows users to run, jump, bend and cough in perfect at Me, Breathes Air With this 1-25th oz. device is a new kind of pad, air-porous and washable. It actually breathes air, and cannot slip off the rupture—a feature, you'll frankly admit, that is lacking in your present appli- ance. In fact, it is so superior and different that it is praised by physicians as “an entirely new de- parture.”’ Users report they have forgotten they are wearing it. But don’t buy it yet. See It First By aecpecial arrangement you can now have it sent to your home without obligs ation to wear it. Don’t send a penny or order it now. Just mail the coupon for full desc — of ‘Magic Dot”’ and details of this unusual offer. Act now for quick relief. Write your name and address on the coupon and mail it today! NEW SCIENCE INSTITUTE \ 2149 Clay Street Steubenville, O. \ - SSCS C CSRS CRESS ER eee eee eee eee eeEEE ' eS * . = New Science Institute, 2149 Clay St., Steubenville, O. . H Please send me free your illustrated book and sample of Airtex. Include also your offer which permits § . me to see the New Science System without cost or obligation. s : : : Name . . . : H . Address + . . . = s 7 \ . 5 City State. sees ssseeeeees } 4 LPPTTTTTTTITITITITIITTTITliiriiiiiiitietliltiiiliiltll ——*.f, ~ 2 — EVERY DEAF PERSON KNOWS THAT I make myself hear, after being deaf for 25 years, with these Artificial Ear Drums. I wear them day and night. They stop head noises and eee enty They are perfectly comfortable. No one sees them. bg Cn es tell | ou a true atory.,how Igotdeafan ard. 3. I make you hear. Address Medicated Ear Drum le taking course."’ Don’t ¢ and guarantee. cro. P. WAY, Artificial Ear Drum Co. (inc.) | DETROIT Schoo. oF LETTERING DETROIT, MICH. 80 Hoffman Bidg., 2539 Woodward, Detroit, Mich. ELECTRICITY Srupy right at home in spare time to get a good position in this fascinating profession or have a business of your own, Complete, practical, well-illus- trated electrical courses of International Correspondence Schools make every step easy. Cost $200,000 to prepare. Written by well-known electrical engineers. Endorsed by Edison and Steinmetz. NO JOKE TO BE DEAF AL "snow CARDS |e CNTERRATIONAL CORRESPONDENCE SCHOOLS, Box 5539- F, Seranton, Pa. Vithout cost or obligation, ple Ase Se nd me booklets describing your courses in ELECTRICITY }] RADIO —- AIRPLANE ENGINES Drafting () Civil Engineer 0 Chemistry CL) Automobiles Mail Coupon” Name for Free Booklet Address

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~I to

Can We Talk with Spirit Friends? ‘Easily; Says This Great Mystic O other problem has been so fascinating for mankind as that age old mystery, ‘‘Can We Communicate with Our Departed Dear Ones?"’ And now one of the great mastersof Psychic Powers declares that the ability to talk witn spirit friends can be developed under the proper guidance. Not only that, but he gives definite rules and instructions for discovering and cultiv ating Lpavens ychic powers. famovs seer is Swami Bhakta Vishita, a Hind faster, noted as an authority on Psychic Manifestation. In simple. every- day language he reveals the long hidden mysteries of Clairaudience, apparitions, spirit guides, telepathy, Voodooism, Crystal Gazing, and Black Magic. All the different methods through which spirits talk are carefully explained—Writing and Drawing Mediumship, Trances, Inspira- tional Speaking, Impersonations, Spirit#Ra appings. and Table-Tiltings, Materializations, Trumpet Talking, and Slate Writing Not only are these methods fully explained, but complete instructions are given for the my these various powers, and conducting the Spirit Circle is great book is also filled with fascinating in- cidents and thrilling accounts of actual incidents of spirit return. Swami Vishita also takes up, besides the methods of communica- tion with tne dead, the subject of the development of our onal- ities through harmony with the finer vibratory forces of nature From the infinite wisdom of the East, he tells us about the great mental currents and Psychic Vibratory Waves, which, when we semanas them, can be used to bring us a fuller, richer, happier ife.

These Fascinating Mys- Send No Money— | ‘tries Fully Explaines 5 Day Trial The Nature of Spirit . Power rhis great book by Swami Vishita | How to Conduct Spirit is called Genuine Mediumshtp, or The Circle Invisible Powers. In order to get this | Crystal Gazing invaluable information into the hands | Spirit Rappings of the many thousands eager to get State Writing in touch with their dear ones on the | Psychometry other side, we have made every effort | How to Develop Telep- to offer these lewons at an extremely ath ow price. Consequent ‘ou POW cAn secure this ae work for elie $1.98. Send no ee money— just fill out and mail the coupon below 4 When the package arrives pay the postman $1.98 Fraudulent Spirits Trance Phesaomena plus a few quis pooteee Taspect this omecing volume for five Then if you are not de- y ~ - lighted return it and your money will be refunded eed my tn Get the coupon in the mail this instant—we have be mineer =<: rits only a limited edition at this low price. Franklin The Psychic Triangle Publishing Co., 800 N. Clark St., Dept. G-190, | Public Seances

POPULAR MECHANICS ADVERTISING SECTION

or Middle Aged Men Forty thousand men have already learned the amaz- ing benefits of a new method of gland stimulation Now in your own home you can use a Dp’ you have these

new drugiess gland treatment endorsed by noted doctors and sanitariums ip many sections. Do you have prostate dis- order? Bladder trouble? Any of the symptoms? symptoms mentioned in the box at the . : : left? Then write immediately for a new FrequentUrination] booklet, “‘Why Many Men Are Old at Foot and Leg Pains} 40," which gives the real facts about that asinine often misunderstood subject of ‘‘rejuvena- tion."’ Learn how thousands of men, some Nervousness as old as 90, have ended these too common Loss of Pep and distressing conditions of mature years. No obligation. Simply request free book, by letter or post card, to the address below. Book will be sent in plain wrapper. THE ELECTRO THERMAL COMPANY 2106 Morris Avenue j : Steubenville, Ohio Western address: Dept. 21-F, 303 Van Nuys Bldg., Los Angeles, Calif Bladder Trouble Prostate Trouble

apne ng tefconefgpererna nye ere ardboreigugas aes ean deem | FRANKLIN PUBLISHING CO.. 800 N. Clark St., Dept. G-190, Chicago, Tl. Please send me a copy of Genuine Medtumshtp or The Invtsible Powers, by Swami Bhakta Visnita. When package arrives I will pey postman only $1.98, plus few cents postage. If not delighted, I am at liberty to return the volume Pyithin five days and my money will be refunded. PPT ee City. - State If you may be out when the postman arrives send $2.00 with the coupon, and we'll pay the postage. Price outside U. 8. L* 50 cash with order ae a a cee ee a ee ee ee es ee ee ee ee ee ee oe oe me ee Zz ~ B ° eee eae ae ieee

A Week Is Earned to By Cartoonist« Toda DO YOU LIKE TO DRAW? Billy Hon’s Famous Cartoon Book Will Teach You A short road to success for the beginner, as well as the advanced art student. A simple, complete and up-to-date course in cartooning, consisting of 30 lessons and over 300 drawings by Billy Hon, the celebrated newspaper cartoonist. Sent for $1.00 postpaid; outside of U.8., $1.25. Wasley Publishing Co., 210-A West 14th St., Los Angeles, Cal. MECHANICAL DENTISTRY n U a Year THIS money-making profession eas Earn Up to $5000, a Year ines ine ten epee in Soh road fare allowed—no extra cost. Write NOW for tr s catalog P and epecial toot offer. A ens— N. Y. SCHOOL OF MECHANICAL DENTISTRY, 147 W. 33rd St. WN. Y. I POSITIVELY GUARANTEE to increase your arms one-half inch in size, chest one full inch, strength 25%, health 100% in one week’s time, by following my instructions and using my exerciser ‘10 minutes mornings and at night. Send $1 for com- peote course and exercisers. Satis- action guaranteed or $1 ~efunde it Prof. J. A. DRYER, Box 1850-P, Chicago, I! Learn To Fly $100.00 WILL START YOU Complete courses, flying and shop work in equipped aircraft factor 20 years’ experience. Best offer obtainable. OVERTIME WORK in factory GUARANTEED to students taking the day courses. Spec evening course and EMPLOYMENT ASSISTANOE to students © ~. to. werk ner — Ser INTO THE GAME NOW how to get unlimited flying tins HEATH SCHOOL of AVIATION, Dept. A337, 2856 Broadway, Chicago, !!\

Mail for

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— b Mail Coupon” Name for Free Booklet Address POPULAR MECHANICS ADVERTISING SECTION 73 ROWING — Growing — Growing! LOOK at those muscles grow! You almost need a moving picture camera to keep = with the speed of their develop- ment! You think it takes years to build up a powerful body? Boy, it only takes DAYS! Take a good look at these two pictures. First fen naz- tion "aN use a endorsed state din you see a lad who scarcely has pep enough to , Of te raise his arms. He doesn’t seem very proud of or a new them, does he? And no wonder! Those soft, aK skinny chicken wings aren’t much to brag about. eluvens- But now for the next picture. Holy smokes! Is ‘common that the same boy? Sure enough, and see how — he’schanged! Why, his arms have doubled in l. to the ae size. He’s got a pair of biceps that stand out like shes BEFORE carved granite. His forearms are sheathed in APTER Before this lad learned sbout at wads of muscle. And note how his chest | Look | what happened when c Ohio [fii Talming he was ag soft a8 has broadened and deepened! Say! He never isiéoton thejobl, Inan amar- — oped. , He had no pep, Just knew he had so many muscles. But I know completely rebuilt, his whole body Earned wrote to Titus, where they are, and I know how to develop them. PANTHER musclest «°° Mists ; / : | Now Watch YOUR Muscles Grow: — You’ve seen what I’ve done for one man. _ beef, but oe gg reed aig medion -ccnaath, omplete That’e 3 . ’ rippling, fast as ning, strong as steel. ose eising Thee oy —, ot want Eve see for ‘are CHAMPION muscles-the kind of muscles that Sent for (housands. ow | want to get to Work ON make Titus Trained men the most perfect fighting es, Cal. \ OU ! How would YOU like to add machines that science can develop. — INCHES of tough, powerful muscles to Don’t think I’m going to make you work like a RY yourarms, your body, slave. Say! All 1 want isa few minniens day. Just re our legs? Not just follow my personal directions and watch results! I eas y rat un ‘: of work fast. My methods are scientific. “They'll ac- tL, N.Y clumsy complish more in 30 days than ordinary exercise will ag do for you in a year! You see the proof in the pic- Y tures shown here. Now let me prove that I can do I want to send you a copy of the most remarkable muscle-building book = ever laid eyes on. It’s the same for YOU. I don’t care what your present condition may be. I’ve made over fellows who were actually cripples. And I’ve trained champion strong men of the world. Strong or weak, I’ll give you just what you need to make you a perfect specimen of MAN POWER. Titus, Dept. M-127 ihe singe have « packed full of one pee 105 E. 13th St., New York, N. Y. i eoek, 8 fodyand bow = demonstrations and vital facts about ke pink” now. cane: tf bought them ‘aif strength and health. cos found the best. I from dumb-belle up, but It reveals Titus’s scientific method of training you in your own home. No cost, no obli- Yes! I’d like to have your book. Please mail it to me FREE. ow the that gave me the 4 add a me ranther-tege and is tion. Just send name and ress on . | ~ ‘eons ee from Titus oak a & aaiened ox te letter, 0 PEPE PEPESLOUELER ELLE Se oe F the same ome LT booght ten Dept.M-127. But doit NOW. eare ago. There isn't srother, dawtrostor | like Rn i. t on cincndinitinannaan mings tpineta a HERMAN BAXON The One 105 E. 13th St. ‘ ‘o rthur aa er = ant Oaly New York City RN ous cased ctu ek 3 Pate... ci ibes

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74 POPULAR MECHANICS ADVERTISING SECTION

New American Eagles The Porterfield Flying School is operated under the man- agement of the American Eagle Aircraft Corporation, Kan- sas City, Mo., the third largest aircraft factory in the United States. Unlimited opportunities in all departments of Aviation are waiting for properly trained men. More than one hun- dred airplane factories are turning out thousands of planes. The American Eagle Company alone is now producing ten ships per week. It is impossible to keep up with the tre- mendous demand for aircraft. Only the great shortage of pilots, airplane riggers, mechanics and builders is holding up the faster development of Aviation. Porterfield graduates have fine opportunities to accept big paying jobs with new American Eagle distributors and dealers that are being appointed every week all over the country. Allinstructors are army trained licensed transport pilots. Your individual training is on modern equipment and government approved American Eagle airplanes Send for illustrated catalog describing complete ground school and flying course. State age and occupation. PORTERFIELD FLYING SCHOOL, Inc. Dept. P10, 2800 E. 13th St., Kansas City, Mo.

861 PRACTICAL IDEAS for REDUCING FARM LABOR and INCREASING INCOME One farmer writes: “I would not take $100 for my copy if I could not secure another.’ The Handbook for Farmers contains 138 ideas for the farm shop, 35 oy fencing, 98 on auto, truck and tra tor, 61 on farm buildings, 36 on held machines, 48 on concrete work orchard work, 23 on painting, ’ live stock, 34 on poultry, 54 on gar- den work, 25 on electrical work, 22 on farm tools, 16 on hunting, fishing and trapping, 140 household helps 394 HELPFUL KINKS to LIGHTEN the LABOR of the FARMER’S WIFE The Handbook for Women con- tains: 83 kitchen and dining room helps, 17 on garden and flowers, 19 on sewing and mend- ing, 37 on furniture, pictures and fixtures, 38 on laundry and clean- ing, 32 on house cleaning, 12 on music, 14 on sleeping rooms,11 on care of children, 16 on lights, 9 on photography, 14 on cloth- ing and shoes, 23 on house tem- peratures, 12 on water and drains, 10 on Insect pests, and ll \ 47 miscellaneous. 4 SPECIAL OFFER BOTH for $1 (Regular $1.50 Value)

POPULAR MECHANICS HANDBOOK WOMEN Pay post age. If outside U.S. send remittance and include 15 cents extra for postage. POPULAR MECHANICS PRESS Room 707,200 E. Ontario St.,Chicago

7 oe = - wa A # yw” ~a\ 7 m ’ Yo B ! je " < fe ‘ Be an auto expert! Earn $40 and more every week. If you are earning less, stop wasting your life away. The auto industry will pay you more and offer you greater opportunity. You can qualify for big-pay auto jobs through National’s famous job-experience training method. Over 17,000 successful graduates have proved its genuine efficiency. You learn auto mechanics, ignition, repairs, construct- ion, etc., by actual practice. You are definitely certain to qualify. Life scholarship. No age —- a training institution. ist. 1905. Free employment ser- vice. Write for free illustrated FREE auto book ~Explains everything. National Automotive Dept. 712, 4006 Figueroa St., Los Angeles, Calif. Send me the big, FREE National Auto Book that explains how I can get a big pay auto job.

Do You Enjoy Making Things? If so, you should have a copy of this new book published by Popular Mechanics entitled Make It Yourself The home mechanic, whether young or old, amateur or pro- fessional, will take pride «a delight in making many of t things described therein Both father and son will f fascination and an associat of interest in making useful a ornamental articles for mot! to admire upon their « pletion. 900 Articles All Different There are attractive ship models, a great variety of t that operate themselves by means of an ingenieus applicat of mechanical principles, novel amusement devices for indo: and outdoors, for both water and land, unique design furniture for children, scores of useful appliances for the ho! things of beauty and utility for lawn and garden, etc. Special articles instruct the amateur mechanic in the « and use of tools, special tools for special perpesms. how to r and use plans, how to solder, the making of a handy w bench, cuts, joints and methods in woodworking, autom«

repairing, installing radio equipment, house wiring, fixt hanging, —— in glass, leather, metal, celluloid, lathe w utilizing parts of old machines to make equipment that w« Se cape nsive to buy, ete 4 ages —823 Illustrations. Size 7x10x1'4 in. Cloth Binding Price $3.00 Mailed Postpaid upon receipt of price anywhere in world. If you reside in U. 8., Hawaii, Porto Rico, Alaska Mexico, we will send the book by mail C. O. D. if you pre! POPULAR MECHANICS PRESS (ROOM P-202) 200 East Ontario St. Chicago, !

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» for BOR )ME ould not Pould hot contains D,. 35 on And trac. 6 on fleld rk, 22 on ng, 15 on On gar- work, 22 r. fishing Id helps. IL ITEN VIFE is? ok just hether _ HERMAN Baxon’ = = The One ee ee.. s sauawone stones and Only ie ah OE These ieee. sss... State... cba. POPULAR MECHANICS ADVERTISING SECTION 75 Books on 65 Practical Subjects Popular Mechanics Press spot in supplying the outstanding pest book on any subject. Check the books you want, and mail this adverusement a8 your order blank. AIRCRALY HOME REPAIRS Dyke's Aircraft E Practical Book of Home instructor (Just ut). $5.00 R esecccccccc oQaeee ARCHITECT ness HOLD Design and rorty . $2.00 Le ag ae ny ARMATURE WIND Built-In Furniture..... $2. Winding and Motor INTERIOR DECORATOR Mn pedeset eene $3.00 saeereer Wall Decora- ll SR OO eee ° Dyke's Encyclo - $6.00 INVENTOR BOAT BUILDE Inventions and Patents $2.50 14 Popular Types...... $0.50 LANDSCAPE GARDENING BOOKKEEPE ERE RR $2. Bo ok keepers” Hand- LATHE WORK Yas SRR pa $1.00 athe Handbook...... $0.50 Boys: BOOKS —— WORKER he Bey Mechanic (4 Leather Work . . «+ $1.50 EE Ee $7.00 Le TTER WRITING BRICKLAYE R Effective Stn estas 0% $3.00 Plain and Fancy Brick- a. worK 90 OR ee Cb ner see $1.50 Pao kgs cae see oosing CABINET MAKER Loom FIXER Prac Furniture Making. .... $3.50 tical Loom Fixing..$1.50 CALCULATOR MACHINIST Ropp’s Calculator... .. $1.00 Complete Practical Ma- CA ym R De ksageterees $3.00 verything About All mM Cc ’ rere . $2.00 200 Tricks You Can Do.$1.00 CARPEN MAIL-ORDER AND Carpenter's Handbook . $1.50 DIRECT-MAI i CARTOONING St $5.00 How to Draw Cartoons. $3.08 CIVIL SERVIC Course in Civil Service. $1.50 Se MATH MATICS we ep for the Practical Man...... $1. Ott Waneet Uses Com MECHANICAL DRAFTS- GUND. tne svesecceses $0.50 MAN COOKING Practical Course in Me- Settlement Cook Book . $2.50 oft a Drawing. “$1.00 DIESEL ENGINES m L MAKI Diesel Engines, Marine, Model Making........ $3.00 apart epee a ye ae 3.90 poc ‘FANCIER ouTpoor. ‘SPORTS Dog Encyclopedia... .. $2.00 Outdoor Goeres d the Year DRAWING *Round.... .. $1.50 Freehand and PAINTIN G Perspective. .....scees $1.50 House Painting Methods$2.00 DRILLING PLUMBING — and Thread Repair Your Own..... $1.00 ue ee ewe ee $0.. POULTRY RAISER ELECTRI 1AN Breeding and Manage- Electrical Kinks ...... oe ae) ere 2.00 ELECTROPLATER RADIO Electroplating......... $1.00 Trouble Shooting. ... . $3.00 ENGINEER REAL ESTATE Halley's Handbook for Modern Practice....... $5.00 enaty. Marine, REFRIGERATION Beebecceseeccecvs $2.00 a Refrigerat- ENGLISH achine........ $0.50 Self-Improvement in sue Mm MODE ts EMGMER . «cc ccccceccs snip Model Making. . . $2.50 ENTERTAINMENTS sHO worR Producing Amateur En- Shop Notes (16 vols.) . .$6.25 tertainments ....... $2.00 SPIRITUALISM ETIQUETTE —— ~— Seenes =. a Book of Btlquette (2. yg | STRUCTURAL DESIGN FARMER Tim As 8 $4.08 Popular Mechanics one aiéc tenes . ate: sorbate Methods in Taxidermy . $3.50 rong 7 TOY MAKER 10.000 Formulas....... $4.00 aia $1.50 FUR FARMING TREE ae . As a Business, and Why.$0.60 iar $2.50 FURNITURE MAKING WELDER , Mission Style......... $3.00 Welding Encyclopedia. . $5.00 HAND FORGING WIRING niand Forging and House Wiring......... $2.50 Wrought Iron Orna- WOOD FINISHING mental Work....... $2.00 Plain and Decorative. . $2.00 Books sent C.0.D. anywhere in U.S. just check the ones you want, write your name and address below, and mail the whole advertisement. It is your order biank. Whe of postman hands you books, pay him the price and the postal charges, If outside the U. 8. remit when ordering and include 10 cents per book extra for postage. We have many other books on these and 2,000 other subjects. Catalog free. Name,, COCO OPO EERE EEE EEE EEE EERE EHH EEE EH EHH EEEEEEHEEE ES CIY. ceccccccccccccs eCocccccesccceseces SAE. ... cr cccecccees AAGTONB. . ccccccccccccccccccocceccccscccceccescccccococccs ° Mall to Pepular Mechanics Press, Room P5—200 East Ontario St., Chicago, Il. “So you want to get married! “That’s fine! I’m glad to hear it. just wanting to get married is not enough to justify an increase in salary. “Don’t depend on sentiment, or on any man’s favor, to ! 99 But you know, Tom, bring you the salary increases you need so badly. Baila on a firmer foundation than that, Tom. Study your work —learn to know more about it than the other men in your department—and you won’t have to come to me for an increase in salary. “Why don’t you take up a home study course with the International Correspondence Schools? It’s been the making of Joe Browning and Dick Roberts and some of the other men around here, and I’m eure it will help you, too.” Employers in every line of business are begging for men with ambition, men who really want to get ahead in the world and are willing to prove it 4 training themselves in spare time to do some one thing well You must study for promotion sometime! Isn’t it better to start mow than to wait a year or five years and then realize what the delay has cost you? One hour a day, spent with the I. C. S. in the quiet of your own home, will prepare you for the position you want in the work you like best. Yes, it will! Put it up to us to prove it. mail the coupon to-day. ee i —— — -- n SOS INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University’’ Box 5535-F, Seranton, Penna. Without cost or obligation, please send me a copy of your book- let, “‘Who Wins and Why,” and full particulars about the subject before which I have marked X in the list below: BUSINESS TRAINING COURSES Mark and Industrial Management Advertising Personnel Management Business Correspondence Traffic Management Show Card and Sign Lettering Accounting and C. P. A, Stenography and Typing Coaching English Cost Accounting Civil Service tone oy A Railway Mail Clerk Secretarial Work Common Schoo! Subjects Spanish ( French High School Subjects Salesmanship CJ Iustrating C) Cartooning TECHNICAL AND INOUSTRIAL COURSES Electrical Engineering Architect Electric Lighting Architects’ Blueprints Mechanical Engineer Contractor and Builder Mechanical Draftsman Architectural Draftsman Machine Shop Practice Concrete Builder Railroad Positions Structural Engineer Gas Engine Operating eee 0 Pharmacy Civil Engineer Automobile Work Surveying and Mapping } Airplane Engines L) Metallurgy and Mining Barner 0 Navigation O Steam Eng ineering Mathematics D Radie IIc iciosieohseihcetedetaabbetielcassdetetiansels encinsniion’ tebatbeltdldsenioncheaidiananlpidiidlenbdmasiiaiiinisntin IE icncinsitinsicicnptiimnieninsseandanczinnepsidingsineensentiinaranesdinatn Ciiy..... pelea ; Saeaisenaiaineitianatiaientiadys Si dininisneiicdibleietagiimnis Occupation Persons residing in Canada should send this coupon to the Interna- tional Correspondence Schoole Canadian, Limited, Montreal, Conadé

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i Men! Air Commerce NeedsMen! Don't envy the Highly Paid Air Man—Be One! Air Men are in demand. Beat the other fellow to the High Salaried Jobs in Aviation. Western training will qualify you to enter Aviation. Learn how through our catalog, sent on request. Write for Free Catalog ‘“‘Airplanes and Flying’’ Aeronautical Training Division Be Sure to State Your Age WESTERN AIRPLANE CORPORATION Dept.M-628, Monadnock Block, Chicago.!1I. Stop Using a Truss STUART’S ADHESIF PLAPAO-PADS are en- tirely different from trusses—being mechanico- chemico applicators made self-adhesive purposely to keep the muscle-tonic ‘‘PLAPAO” continuously applied to the affected parts, and to minimize pain- ful friction and danger of slipping. No straps, Soft as buckles velvet—easy or springs to apply— attached. inexpensive. For almost a quarter of a cen- tury satisfied thousands report success without delay from work, Stacks of sworn statements on file. Process of recovery natural, so no subsequent use for a truss Awarded Gold Medal and Grand Prix. Trial FREE of “Prapao” will be sent you absolutely No charge for it now or ever. Write name on coupon and send TODAY. PLAPAO CO., 588 Stuart Bldg., St. Louis, Mo. | Vir OUR Mev» CLOCK Profitable spare time work for spring. Turn idle hours into welcome dollars by building clocks from our jp structions. We furnish plans, instrye. tions, blue prints, works, dials, and || materials at surprising low prices You make a big profit building artistip clocks for your friends. Banjo Clocks, Mantel Clocks, works a, low as $1.65. Beautiful Grandfather Clock; with chimes. All styles, all prices. ASK FOR OUR ATTRACTIVE FREE BLUEPRINT PLAN AND CATALOG CAN CHIME CLOCK COMPANY 167¢e Ruffner Street, Philadelphia Deafness Perfect hearing is now being re- stored in all cases of deafness caused by Catarrhal troubles, Relaxed or Sunken Drums, Thickened Drums, Roaring or Hissing Sounds, Perforated, Wholly or Partially De. stroyed Drums, Discharge from the Ears, etc Wilson Common-Sense Ear Drums require no medicine but effectively replace what is lacking or defective in the natural ear drums. “hey are simple devices, which the wearer easily fits into the ears where they are invisible Soft, safe and comfortable. Write today for 168-page book on deafness giving Free Book on Deafness full particulars and many testimonials The hearing of thousands of grateful users has been restored by these “little wireless phones for the ears WILSON EAR DRUM CO., 302 Todd Bidg. Incorporated LOUISVILLE, KY. Handbook for Farmers 861 discoveries by practical farmers, telling how to make repair or improve the various devices and machines used about a farm or garden. 683 illustrations. ‘The Most Remarkable Book Ever Published for Farmers,” says one authority. Send No Money. When the postman delivers the book to you, hand him $1 plus the few cents postage POPULAR MECHANICS PRESS Popular Mechanics Building, Room 711, Chicago, III. Concrete Articles easily made with instruct and pictures to follow. ‘ Concrete Handbook and 1925 Shop Notes tell how to use crete. Hundreds of Ideas. Send No Money. Pay postman 98 Popular Mechanics Press, Room 702, Chicago, Il. cL a ittan Ex seunserere THIS BIG sail OFFER! GIVE GREAT NAVY MODEL AIRSHIP Complete with Parachute Here’s the great Navy model Airship. Large 6-foot air bag with inflators, parachute with automatic release and complete instructions for flying. Will fly for miles at height of 1000 feet. Great chance to study aerial navigation. Send name and we'll send 6 of our new art pictures to dispose of on special 25c offer. Send money you collect and as a re- ward for this service we will send this wonderful Airship with full instructions free. Cc. M. THOMAS 337 West Madison Street 6K91 CHICAGO

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rk for Vvelcome OUP In- instruc. and all rg artistic orks as r Clocks REE LOG (PANY Phia 5S ing re. used by Sunken r Hissing lally De. Ears, ete Tums cking or devices, invisible ‘ite today 8 giving moniais grateful y these € ears.” ted » KY, ———— rs nake used M st s one | Niall LO FePular Wiechiamits Frees, Room P5—200 East Ontario St., Chicago, Ill. ~vi shat Paring Speedo keeps all kitchen knives, big or little, atr or curved, always sharp makes dosens of kitchen tasks easier. — Carving The biggest, finest carving knives are sharpened safely in a few seconds with Speedo, Cutting Grass All kinds of edged tools are given the keenest, smooth- est cutting edge with Speedo. Dress Making Scissors and = shears—al- most impossible to sharpen properly the old way are pertectly beveled and sharpened with Speedo is™ pen SY. AS Works Like Magic Simply rest blade in “magic-groove” and give the handle a couple of turns. Both sides are sharp- Sharpens Scissors At iast! A sure, quick way for women to sharpen scissors Even a youngster ean bevel them easily with Speedo. Sharpens Tools Speedo puts the keenest, smoothest edge that t car take on sickle ke magic A.B.C. POPULAR MECHANICS ADVERTISING SECTION 77 At the Lightest Men, here is a message so fresh that the ink is hardly dry on it! It’s the announcement of a revolutionary sharpening invention! Operating on an amazin new principle! Utterly different from everything else. Teow fully patented. Cannot ‘‘nick,’’ ‘‘burn’’ or injure the finest steel binde. Yet puts the keenest possible cutting edge on knives, tools, scissors, etc., in 3 to 9 seconds, AUTOMATICALLY! AGENTS Already Making $5 to *11 an Hour! EW! Brand new! Yet it fills a need as old as the hills! That in a nut-shell is the sum and substance of this message. Hardly one of you who is reading these words can fail to understand what that means. Nor can any sensible man shut his eyes to the big profit facte— as proved by the many surprising records actually made during the 30 days before these words were written. For example: P. K. Howey, Michigan, writes, “I started after my regular day's work and before 9:00 o'clock had 19 orders, profit $15.50."". Romeo Trembl. Mass., reports $18.90 profit in one day. M. Ornoff, Va., cleaned up $oa4 his first month. Chas ’. Grosvenor, Illinois, says *““My best record so far was $18.50 for 1‘4 hours’ work."" These men are just a few among scores who have already found this the greatest money making opportunity of their lives both spare and full time. Study the Pictures—Mail the Coupon On this page are pictured a few of the things this remarkable new shar- ener will do and how it does them. Look closely. Make no mistake. “he “magic groove’’ makes Speedo absolutely unique. Note the supreme simplicity of this new sharpening method. Note also how it makes dozens of tasks easier. In every home, and in stgres, offices, shops, factories, practically everywhere that knives, scissors or tools are used—it is needed, yes, actually waited for! Once and for all Speedo makes every old method of sharpening as obsolete as a horse and buggy. So-called Butcher's Steels, Oll Stones, Emery Wheels, Steel-Wheel makeshifts, all must go For the Speedo Sharpener makes anyone an expert instantly! No knack or skill required. No fuss or bother. Just turn the crank. You can't sharpen wrong if youtry! No wonder Speedo is approved by Good Housekeeping Inst., Modern Priscilla and other experts. And no wonder, too, that it's a proved fact that 4 out of 5 women buy literally on sight—and men simply can't resi ! This is a big responsible company—in business over 20 years. When they say they offer you complete cooperation they mean it—exclusive territories, real sales training, plenty of advertising literature, etc., Is all yours FREE. The coupon brings full details and ‘‘first-come-first-served " Free Sales Outfit Ofer. Jump in on the ground floor, Mail it today. CENTRAL STATES MFG. CO. DEPT. G-701, 4500 MARY AVE., ST. LOUIS, MISSOURI —— — — EO eee Central States Mfg. Co., Dept. G-701, 4500 Mary Ave., St. Louis, Mo. | | Rush me full details of Territory Reservation and Free Test Offer | Name Address

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~] 0 Automobile service!—the best paying end of the world’s est business! Trained auto men have steady jobs the year around. It's the open shop industry—no unions, no strikes, no lay-offs. Auto repairing has jumped to a tremendous world- wide business. Many millions of dollars are spent yearly to keep the 24 million cars in condition. Car owners have to pay out all the time—it’s $15.00 here—$100.00 there. Trained men are getting this big money. You can get into thts business no A few weeks’ Detroit-training at this world-famous auto school will start you to success. 25,000 Graduates M.S. A. S. trained men are making good—in all quarters of the globe. Be sure of a good job anywhere, at any time. Or, open a shop of yourown. Very small capital needed if you have right training. A Steady Job Now great- owners se jareh for ski illed eervice men. They soon advance to be euperintendente—th get their own busine Car owners, too, are getting more parti n't trust their cars to any but trained men Learn right, @ tate"! Here you work on new cars supplied by fa oh under expert instructors Also omplete business oupon for particulars and big 17th Anni- versary Catalog. Today eure! MICHIGAN STATE AUTOMOBILE SCHOOL A, G. ZELLER, Pres. and Gen. Mgr. The Old Reliable School— Established 17 Years 306 Auto Building DETROIT, MICH. | WANT oe * - Write Today Sure!) SUCCESS MICHIGAN STATE AUTOMOBILE SCHOOL 306 Auto Building, Detroit, Mich. Send without obligation full information about Detroit training to make the most money Also send me FREE your big new illustrated Catalog and Automobile Training Book Name + 7 Street and No. or R. F. D : : City State H 7. } | POPULAR MECHANICS ADVERTISING SECTION _AGENTS— New— Wonderful Self-Wringing Mop re Profits DAILY! Just Out! Every objection to other mops over. come. No wires. Mop worked from flat, solid steel plate. We send sample on approval. Just l | Nothing es ae your mame and ] Here’s a revolution in Mop mak. | Like It! ing. KLEANEZY does away wit all old-style Mops. Three twists of knob wrings Mop thoroughly dry. Broad, steel pressure p] above meshed cloth, scrubs up dirt practically without lab Child can wring it. Test it at our risk. Don’t send deposit { sample, just ask for one. We mail it postp: aid, on approval Here's your biggest bet for quick selling. You'll find the KLEANEZY the fastest seller, biggest profit-maker out KLEANEZY MOP CO., Dept. 3620, Delphos, Ohio $4,500 in ONE Sale That’s what L. C. Clarke made. Formerly a brake- man, earning an average of $638.40 a year. Got started in real estate. Used my successful systen Now has large real estate business of his own. | ashe did. Bea Real Estate Specialist. Use my money-making system. Start in spare time, with- out capital or experience. Send for, free book now Address President, American Business Builders, Inc., Dept. 44-6, 18 East 18 Street, New York, N.Y. LEARN TO FL Commercial Aviation Needs Men We teach by practical a and guarantee to make each student master of his ship. All instruction on U. 8. Gov't Licensed Aircraft by Gov't Licensed Transport Pilots. The cost is low considering the practical experience of daily flying, combined with ground work and theoretical instruction. Writ: us at once for further information. DO IT NOW! VON HOFFMANN AIRCRAFT co. Distributors for Ryan Monoplanes, anes 2% The Spirit of St. Louis,”’ also Eagiero Hiptan NGLUM, mo, 107 Lambert — St. Louis Flying Field, * Ya Make *90 atl Give a ‘ And I will give you your own beautiful WAY raincoat. Selection of over 30 pat resent earnings are you can quickly dou- } WK 4 tle your income! Write at once for big free . selling outfit that makes instant sales for you. rite me now—. ELLIOTT BRADLEY. 230S. Wells.Street. Dent. FL-6, CHICACO. uts BRICKLAYING wes, 200; job. 8 weeks of s! ntensive training, puts you in She field. Individual _lnatruet 1. Learn by doing rint, Estimating, ing inelud terns and colors. No matter what your Absolutely finest slicker and raincoat line in ‘America! V ACT! Weekly and U P Be a skilled worker in healthy “Out of Doors’’ American » Building Trades School, 4341-A W. enlem St, Chicago SO0DELL-PRATT COMPANY -% “GOODELL- PRATT isOO GOOD TOOLS Tran Tz THEATRE MANAGEMENT AT SCHOOL OR AT HOME. SEND FOR CATALOG M. MOVING PICTURE THEATRE MANAGERS INSTITUTE, INC, 135 WEST 44th ST., NEW YORK CITY It’s Fun to Make Things of Wood Our book tells you how to use tools, how to care for them, how to figure a lumber bill, how to make bird box taboret, umbrella stand, magazine stand, table and cat inet. Many pictures. Send no money. Just ask for “Woodworking for Amateur Craftsmen.” Pay postma: 98c and postage. Popular Mechanics Press, Room 710, 200 E. Ontario St., Chicago, Ill —E

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ut! On to Over. Mop solid proval, ie and P mak. ray with € twists re plats t labor, rosit for val i the out Oki ale . brake- r. Got system. m. Do Use my » With- k how. tilders, Di Be Satton 4 es ach

D. Lt | ule 70. 00 ind Up pf short ruction Chicago

sharpened with Speedo @ bike magic POPULAR MECHANICS ADVERTISING SECTION 113

C finest tool of its kind Guaranteed by the name “YANKEE’’ EE this wonderful ““ Yankee” Ratchet Brace , ° < y ” at your hardware dealer’s. Like all “ Yankee Tools it saves time and labor. Try it and you will appreciate the economy of paying a little more to own the finest tool of its kind. : For No. 2100 is made and finished like a precision tool. The Price famous “Yankee” Ratchet is smooth, powerful, silent; as (10-inch sweep) smooth-working as the stem-wind of a watch—yet unbreakable. $8.20 No need to hold chuck to keep it from turning back on ratchet movement. A finger touch on easy-acting Ratchet Shifter gives right or left ratchet, or rigid. Positive visible adjustment. Dustproof. Moisture Try This Test Put Auger Bit into chuck of “ Yankee” Brace. Bore deep in- totough wood. Then pull upward with all your strength. Bit will not come out of chuck.

-proc of,

v “Yankee” Chuck—most efficient ever made. Ball-bearing, quick centering, and accurate. Holds any bit (round, square, any taper) in vise-like grip. Yet chuck re- leases bit at a turn of wrist.

Handles are hard rubber and indestruc- tible. Top handle, steel clad, ball-bearing. Sweep handle caps held by patented “Yankee” method, preventing excessive handle play. Brace is finished beautifully in keeping with its perfect mechanism. **Yankee”’ Bit Extension No. 2150 Price (18-inch) $2.30 Stands abuse and follows through. Bit held by socket. No jaws to break. No loosening and pulling out of bit in work, And bit in “Yankee” Socket can’t jam. Fits any brace. Lengths: 15, 18, 21, 24 inches. Holds large range of bit shanks. Nortu Bros. Merc. , Philadelphia, U. S. A, “YANKEE” TOOLS Make Betlv Mechanics’

Write for FREE ‘“Yankee’”’ lool Book

»ws how “‘ Yankee” Tools make work easier: Spiral Screw-drivers; Plain Secrew-drivers, Ratchet Bit ices, Automatic Push Drills, tomatic Feed Bench Drills, Ratch- et Tap Wrenches, Vises with re- movable base, etc. Dealers Everywhere Sell ** Yankee’’ Tools Yankee”’ on the tool you buy means the utmost in quality, efficiency and durability

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POPULAR MECHANICS ADVERTISING SECTION ny Bae ney, ; 4 A home town enterprise backed by national experience An Advertisement of the American Telephone and Telegraph Company Tue Bell System is a home town enterprise in operation so that each community may have service that suits its needs. It is a national enter- prise in research, engineering and manufac- ture so that every telephone user may have the best that concentration and quantity production can achieve. There are twenty-four operating com- panies devoting their energies to telephone problems throughout the United States— for example, the Northwestern Bell Telephone Company operating throughout Iowa, Min- nesota, Nebraska, North Dakota and South Dakota. It has 11,000 men and women— friends and neighbors of the other people in their towns— wofking to maintain in its territory the best standards in teleph- ony now known. In New York, in the American Tele- phone and Telegraph Company and the Bell Laboratories, are 5000 persons, includ- ing scientists, engineers and consultantsin man- agement, engaged in inventing better appa- ratus and discovering better ways todo things. The Company with its 11,000 employees has the use of all that this group of sooo in New York discover and perfect. Likewise the other twenty-three operating companies. They are regional or- ganizations adapted to local conditions, but behind every telephone in city or hamlet is the national organization for the develon Northwestern ment of the telephone art. ree

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el eee Veen eee oes VS —_ . means the utmost in quality, mf efficiency and durability e BettOv Mechoni POPULAR MECHANICS ADVERTISING SECTION 115 Racinc car drivers can’t take a chance with their engines. Before a race they test their cars with the best gasoline obtainable. Then they add “Ethyl” fluid—the anti-knock com- pound—to develop the last ounce of power for speed and safety. Similarly, leading oil companies are adding “Ethyl!” fluid to the gasoline pro- duced for the general motoring public, so that your car too may increase its per- formance under all driving conditions. This fuel is called Ethyl Gasoline and is sold at pumps which display the emblem shown below. Read the facts about Ethyl Gasoline given below. Remember that even the best gasolines become better when “Ethyl” fluid is added. ETHYL GASOLINE CORPORATION 25 Broadway, New York City 56 Church St., Toronto, Can. What Ethyl Gasoline does I: THYL GASOLINE was de- 4 veloped by General Motors re- search to provide a more efficient fuel for internal combustion engines. Itis formed by adding Ethyl! brand of anti- knock compound (“Ethyl” fluid) to selected motor gasoline in an amount sufficient to utilize the higher compression created by car- bon deposits or advanced engine design. What Ethyl Gasoline is Ti Ethyl” fluid is a concentrated l:quidcontaining tetraethyl lead which has the property of controlling the combustion rate of gasoline. It is a patented product. Ethyl Gasoline is colored red for identification. The color has nothing whatever to do with its performance. It takes more than dye to make anti-knock”™ gasoline. Ethyl Gasoline is sold only at pumps which display the “Ethyl” trademark. Ethyl Gasoline is the yardstick by If your car is designed to operate on ordinary gasoline, the use of Ethy! Gasoline will: Eliminate “that knock” and power loss Make carbon deposits a source of extra power. For carbon increases compres sion and Ethyl Gasoline is the high compression fuel. Give a smoother and better pulling engine. Reduce gear-shifting and increase accel- eration, thereby making traffic driving easier. Cut down vibration, thereby reducing engine wear and tear and depreciation Save you the expense of carbon re- moval and other repairs caused by “knocking” and carbon formation. Give more power per gallon for your fuel bills—and more mileage as com pression és increased by carbon deposits If your car is a high compression car, just remember that Ethyl! made it possible and is necessary to obtain maximum performance. which other gasolines are measured.

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116 POPULAR MECHANICS ADVERTISING SECTION Plan No. 1d A Plan No. 4d For hands that are “All Thumbs” Stanley Plans make woodworking easy Nothing compares with the satisfaction and pleasure you will get from making articles . like these with your own hands and your own tools. With Stanley Plans to work from, the job is easy and inexpensive. There are 25 different Stan- ley Plans. The list is shown in the centre of this page. Each plan tells you just how to make the object, covering every step—how to select and cut the wood, how to assem- ble the job, how to sandpaper, The best tools are the cheapest to use No. 1d—Book Rack 2d—Candle Stick 3d—Pipe Rack 4d—Flower Box 5d—Table Lamp 6d—Toy Automobile 7d—Sconce 8d—Dinner Gong 9d—Bird Houses 10d—Dog House 1lid—Book Stand 12d—Smoking Cabinet 13d—Kitchen Cabinet 14d—Sewing Cabinet 15d—Cedar Chest 16d—End Table 17d—Tea Wagon 18d— Model Sailboat 19d—Combination Sail- and Row-boat 20d—C om bination Kitchen Seat and Step Ladder 21d—Garden Seat 22d—Garden Trellises 70d—Small Tool Chest 71d—Large Tool Chest 72d—Work Bench This book, ‘‘How to work with tools and wood,”’ takes all the mystery out of wood working. Tells how to make useful objects,do odd jobs, and care for tools. 185 pages 150 illustrations cloth binding At your dealer’s or direct, $1.00. paint and finish it. To do your best work you need good tools—of course! Practically every carpenter uses Stanley Tools. Manual Training classes, too. Stanley makes the most complete line. Buy your Stanley Plans from your hardware dealer. If he cannot supply you, write to us. Send 10c for each plan and ask for a free catalog of Stanley Tools. Ad dress The Stanley Works, New Britain, Conn. Ask your hardware dealer STANLEY TOOLS The choice of most carpenters

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9 » do good cally inley ling s the ‘ans aler. you, for free New Ethyl Gasoline is the yardstick by which other gasolines are measured. 7 8 BD ee, ees maximum performance. POPULAR MECHANICS ADVERTISING SECTION 117 New Low Pniced Electric Pop-corn Machine Creates Amazing Opportunity for $200 #01000 Monthly Profits! DEALERS! el w li make your ste space pay big prof- Nine it ol ten cus- ers buy pop-corn else- here why don't you et these extra sales? Let show you how other ealers are making these Sy prohts SALESMEN! Trop everything—here's ir proposition. A few les a week can net you $100.00. Sell drug stores, ir stores barbecue nds, et market un- ited! No experience eeded we give you ex- ct method that assures steady $20.00 days. Ter- nitones going tast SPARE-TIME _ WORKERS! ien and women get to this great pop-corn isiness and make $50 to $200 a week We show you complete plan that inswers every question Small payment down tarts you. Learn about Maj! coupon now AN, do you realize the money that is being made in the pop-corn business today? MILLIONS OF DOLLARS! Stand near any pop-corn stand. Watch people hand- ing dimes to the dealer as fast as he can hand out bags! At a good location 50, 100, 200, 500 sales in a few hours—$5 to $50 cash- AND 75% OF IT IS CLEAR PROFIT! And now a sudden new opportunity to cut yourself a big slice of these easy profits is dropped into your Why is it that only a small percentage of stores (in comparison to the demand) sell pop- corn? Simply because the big majority of dealers have never bern approached. They never realize the long profit, big sales and fast turnover on pop-corn. And, then again, many have balked at paying $300 to $1,000 for a pop- corn machine But now this last remaining obstacle to big profits is swept away! Here's a beautiful, effi- cient, modern electric corn popping machine at a price less than the down payment on many other machines of the same efficiency! So amazingly low that it often pays for itself the first: week. And sold on easy payments if cesired, A New Invention Make no mistake. Don't think that because the price is so low that this machine has any cheap construction or weak parts to get out of order quickly. It is designed and sold by The Excel Flectric Company, originators and largest manufacturers of domestic (electric) corn poppers, sold all over the United States This fea price could only be made by such an organization as this nationally advertised con- cern, whose production facilities can turn out a huge volume of these machines at low man ufacturing cost! Excel is guaranteed for one year! Heating element is of genuine Nichrome. Beautifully fin- ished in decorated mahogany plate glass, and nickel plated metal. Popper itself is genuine alu- minum Easy to operate. Just shove the plug into any socket and pop 80 10c tags in less than an hour! When you see and examine this beautiful machine, you'll wonder how such a value is pos- sible! Sold on cash or easy terms Dealers—salesmen—men and women who want to get into the pop-corn business in full or spare time MAIL THIS COUPON We have a complete money-making plan for each of you that answers every question and explains everything fully Absolutely no obligation But act quickly You can't lose Tear this coupon out and mail to The Excel Electric Co., Commercial Corn Popper Division, Dept. G-16, Muncie, Indiana ‘ . RUSH COUPON FOR DETAILS . The Excel Electric Co., ® Commercial Corn Popper Division, 4 Dept. G-16,. Muncie, Indiana. 4 : . . . . Yes, rush me full information regarding your money-making plan I am interested because ( ) I am a dealer ( ) I am a salesman ( ) 1 want to start up a pop-corn stand Check the reason you-are interested.) . - . . a . Name ° . . . Address ‘ cones evense ae sooo B 7 . . . 7 . $ City State 4 swcccccccccccescesescesesscccesescsccssssscesest

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~~. 4240 Oa 4 2S Oe ee = = eet es => ee 118 POPULAR MECHANICS ADVERTISING SECTION * COMBINATION SET No. 438 Planer ond Shaper Gauge ie. os qnven ane in ad- justing the cutting tool. e design of the gauge . makes it easy to set to a micrometer and permits a . tht ee / tool setting from 4" to 84" with only one extension. GAUGE No. 620 Users of Tools Are Good Judges of * SCREW PITCH GAUGE No. 630 aiue Men who use precision tools have the mechanical training that enables them to judge mechanics’ tools fairly. “ ” CALIPER They appreciate that fine finish, clean cut JQ No. 570 graduations, and good design indicate tools of mY high quality. They know that accuracy and reliability can come only from the most exact- ing standards of workmanship. That’s why mechanics everywhere respect Brown & Sharpe i, fo Tools so highly when they judge tool values. = Ask your dealer for Small Tool Cata- ae log No. 30 listing over 5,000 items. If he cannot supply you, write us direct. Dept P. M., Brown & Sharpe ——s Mfg. Co., Providence, R. L, U.S. A. =A BrROwN * MICROMETER CALIPER No. 55 * For description of this tool see Catalog No. 30 [BS “wORLD’s STANDARD OF ACCURACY”

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re UGE INS ER Se yvue AAC Eee M 4 coupon Ir VUuY ne ? . | corn poppers, sold all over the United States § City 1, 1OwW } s his low price could only be made by such an Seneonboveseoeseseeeenensse a 7OR: The Singlemthe fa- POPULAR MECHANICS ADVERTISING SECTION HOUSANDS of trail wise, pleasure-bent sportsmen ride the Harley-Davidson Twin—because it fits their needs, fits their pocketbooks, and multiplies their sport. Join them this year! Crowd your after-work hours and vacation days with happy, carefree sport. You'll thrill to the Harley-Davidson’s power. You'll admire its low cost of operation—2¢ per mile pays for everything! You can buy a Twin for $310 f. 0. b. factory, on easy Pay-As-You-Ride terms. Ask your dealer. os cS 2, Mail the coupon for our latest catalog. Re) Haritey-Davipson Motor Co. DEPARTMENT P Mitwauxeeg, Wis. s solo mount per gallon f.o. b. factory + equipment t :t travels ‘80 1 is priced at only Pu ; b - be | models have both front and rear-wheel ikes and complete | ! | ! ! ' ' ! ' ! | | | ! | ' | ' ! | t ' | | ' ! ! | | ! ! | | ) Sete ag oo he ng MOTOR CO. Dept. P., Milwaukee, Wis. (C) Interested in selling motor- cycles. Address.......... : . | { | 1 EBay Be ee ee | | | l | genes 5 g 2 = % ( State 119 Mail this Coupon

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120 POPULAR MECHANICS ADVERTISING SECTION 16 inch— Weight 2035 Ibs. Quic k Change Back Geared Screw Cutting Lathe, 8 foot Bed. With countershaftand equipment $570 13 inch— Weight 1460 Ibs. Tool Room Quick Change Back Geared Screw Cutting Lathe, 4 ft. Bed. With motor andelectrical equipment. Price - - - 11 inch— Weight 675 Ibs. Quick Change Back Geared Screw Cutting Lathe, 3 foot Bed. With countershaftandequipment $325 New Resin Brow Lathe Handles all Brake Drum work with- out removing tire orrim. No. 1 for wheels up to 33” diameter, complete with countershaft and equipment weight 1225 lbs. Price - - - - - $425 Carried in Stock by Machinery Supply Dealers in Principal Cities Throughout the World ATLANTA, GA.—Fulton Supply Co., 70 Nelson St. BALTIMORE, MD. — Carey Mach. & Supply Co., 119 E. Lombard St. BIRMINGHAM, ALA.—Moore-Handley Hdwe Co. 21st & Ave. ‘*A’’ OMAHA, NBB. —Interstate Mach. & Supply Co., 1006-10 Dougias St. Co., 465-71 Atlantic Ave. BOSTON, MASS.—Joseph Beal & CHICAGO, ILL.—Scott Bansbach Mach. Co,, CINCINNATI, OH10—The E. A. Kinsey Co., CLEVELAND, OH1IO—Clark Machinery Co., DALLAS, TEX.—Huey & Philp Hardware Co., DENVER, COL. — Hendrie & Bolthoff Supply Co., 1621 17th St, DETROIT, MICH.—Lee Machinery Co., HOUSTON, TEX .—Brazeiton-W essendorff & Nelms, 317 Preston Av. KANSAS CITY, MO. ,—H.J. Brunner Mach. Sup. Co., 1512 GrandAv. LOS ANGELES, CALIF .—Eccles & DaviesMach.Co. ,320 San PedroSt. MILWAUKEE, WISC.—Western Iron Stores Co., 145 W. Water St. 3171 Bellevue Ave, South Bend Lathes New Model Back Geared Screw Cutting Lathes for the Manufacturing Plant Machine Shop Laboratory and Service Station Engineering ae Write for Catalog No. 89A showing complete line of new Model So Bend Lathes ranging from 9 in. to 24 in. swing and from 2% to 16 ft beds—with countershaft or choice of 3 types of electric drives, al at surprisingly low prices. P 64 accuracy tests with precision instruments applied in the recision manufacture of each South Bend Lathe insure its accuracy s& Simplest adjustment and absence of all unnecessary parts ena pee the operator to work at highest efficiency. Du bili t South Bend Lathes are sturdily built of most durat ra a ¥y materials. Electrical Shop ” 14,’ Nt 9” x 22 SO: Junior Back Geared eo hes Screw Cutting on ia Ba pe Complete with Countershaft § 1 50 — wil and Equipment Features Built in the same ‘plant where 40,000 other fine —Power Feed to Carriage ton Precision Lathes have been manufactured for the —Set-over for Taper Turning he United States Government, Ford, Westinghouse, —Hole through spindle 3, in. the Bethlehem Steel Co., U. S. Steel Corporation, and —11" Between Centers gla hundreds of other large industries in the United —Cuts threads 4 to 40 per in. , States and 78 Foreign Countries. It is the world’s um draw-in Collet val largest Lathe value. size 2 in. , Easy Payments if Desired an th: A small down payment brings you the Lathe to use while you are paying { a" In this way it earns its own cost by the work it does and the savings it ma} In: FREE—Write for No. 89A Catalog and New Booklets . Check off in the squares below, indicating the Lathes in which you are interest 1 —cut out and mail to us. Special booklets and Catalog No. 89A showing :‘ to! Sizes and Types of New Model Lathes mailed free postpaid on request. O Qin. Junior Booklet 22k 0 16 in. Lathe Booklet bu OO 9in. Lathe Booklet () 18 in. Lathe Booklet to. ©) 11 in. Lathe Booklet ©) General Catalog No. 89A rf © 13 in. Lathe Booklet 0) “How to Run a Lathe” gi © 15 in. Lathe Booklet price 25c, posipaid 0) New Brake Drum Lathe Circular us South Bend Lathe Works : ,.u ese Stee’ New York City Salesroom: 183 Centre Street NEW ORLEANS, LA.—Oliver H. VanHorn Co.lnc.,522-534 Camp St. NEW YORK CITY, N.Y.—J. E. Beggs Co., 183 Centre Street PHILADELPHIA, PENN. — Delta Equipment Co., 148 N. Third St. PITTSBURGH, PENN. — Somers, Fitler & Todd Co., 329 Water St- 335 Fourth St., W. PORTLAND, ORE.—The Portiand Machinery Co., 62-4-6 First St. 1235-45 St. Clair Ave, PROV IDENCE,R.1I.—The E.A.Eddy Mach. Co., Eddy & Clifford Sts. 1029 Elm St. ST. LOUIS, MO.—Blackman-Hill & Co., Inc., 1513 N. Broadway 8ST. PAUL, MINN .—Robinson-Cary @ Sands Co,,4th & Wacouta Sts. SAN FRANCISCO,CALIF .—C. F, Bulotti Mach. Co., 829 Folsom St. SEATTLE, WASH, — Perine Machinery Co., Inc., 209 First Ave., 5. TOLEDO, OH10—The Kirkby Mach.& Supply Co., 20-22 St,Clair St. MONTREAL, QUE.—Can. Fairbanke-Morse Co., 84 St. Antoine St. TORONTO, ONT.—A. RB. Williams Machinery Co., 66 Front St., W. 130 8, Clinton St.

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1 5 POPULAR MECHANICS ADVERTISING SECTION 121 C&L 32 This is one of the most popular blow-torches we have ever made. It is designed for the man who uses a blow-torch in his daily business and demands not only excellent performance but rugged ability to stand rough handling. 32 contains the most advanced, patented C&L improvements. It has a red handle. Sure sign of satisfaction. Fe eee ee ee eed = pT: nn ll ig SIR ps5 ay MiG 9g We’ve put a red handle on it to be sure you get Clayton & Lambert Next time you’re in a hardware store or electrical shop, if you happen to look over the line-up of blow-torches you'll see some with red handles. They’re Clay- ton & Lambert torches. We put the red handle on so you could tell at a glance that you were getting the best value you can buy in a blow-torch. The red handle doesn’t make it work any better. The insides you can’t see do that. But the red handle tells you the insides are right. It’s too bad you can’t see what a lot of improvements we’ve made in blow- torches. Improvements that make them burn hotter, burn longer, and last longer too. But they’re there, all right. And they give such definitely better service that users have made Clayton & Lambert the largest selling blow-torch in the world. Here’s an example. The little hole the gas comes out of must be fifteen-thou- sandths of an inch in diameter. If you spread that hole you might as well throw the torch away, for it won’t work satis- factorily. Clayton & Lambert devised a way to make sure that hole couldn’t be spread, but at the same time whenever you close the hole you clean the carbon out of it so it can’t clog. That’s just one of the many Clayton & Lambert patents. So when you need a blow-torch—and if you’d just think about it a minute you'll be surprised how often you do, for scrap- ing paint, or fixing up the radio, or any number of jobs around the house—look for the blow-torch with the red handle, in the hardware or electrical store. Your money can’t buy better. CLAYTON & LAMBERT MANUFACTURING CO. Detroit, MICHIGAN

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ee wae OO Oe awa ‘ NATURE’S FEET No. 2* The Coyote travels at . POPULAR MECHANICS ADVERTISING SECTION 100 yards a minute HE coyote of the Western plains is one of the swiftest of American animals. be fast in order to eat. wise swift runners. Read Trapper Evans’ account of his unusual experience with a coyote: For the other beasts of the prairies that he must catch for his meals are like- sight. He has to smaller. “One morning I was out hunting geese with my brother. sitting waiting for the geese to arrive. come, but off in the distance we heard a coyote howl. As day commenced to break we noticed the coyote sit- ting on a nearby hill about half a mile away. I would have some fun which had a bullet hole through it, my gun in hand, | crawled through the holding the decoy just above the top of the grass. I had gone about 50 yards when I looked back and noticed my brother wav- ing me to lie down. I lay down quickly and looking through the hole in the decoy beheld a strange grass, **THE GLADIATOR” This popular Keds model for all around use has a distinctive non-skid sole. In brown, white or gray. Copyright, 1928, by United States Rubber Company We had placed the decoys around us and were They did not So, picking up one of the decoys soles are tough ground or floor. I thought The coyote, thinking that one of the geese had strayed from the flock, was crawling slowly towards me, every once in a while rising to look at his supposed prey I lay perfectly still and waited until he approache within 50 feet, and then rising quickly fore he had recovered from his surprise. and i% uy To American Boys An Offer of the Actual Footprints se | 98 of the Coyote Sie ; : ‘ae By special arrangement with _— Trapper Evans the makers of Keds are now able to offer you the actual tracks of many American wild animals. Each one is an original, iden- tical footprint — hardened in claylike material, mounted on felt. Write to Trapper Evans, care of Keds Outdoor Department 2270, 1790 Broadway, New York City, enclosing 35c, and obtain a track of the coyote sent postpaid in U.S. and Canada. Acomplete list with prices of the wild animal tracks made by Trapper Evans will be mailed free on application. I shot him be “The coyote’s feet are very much like the wolf’s, only He is a cunning fellow and very swift.” rape Gr EDS special models for boys give your feet much of the springiness of the coyote’s paws. Keds springy. The uppers They grip surely on are light, yet strong. And the special Feltex innersok keeps your feet comfortable Ask for Keds by name. But be sure the name “ Keds”’ is on the shoes you buy. That name is your guarantee of getting the best dollar for dollar value in rubber soled footwear. Write for our free booklet containing all kinds of infor- mation on games, sports camping, vacation sugges tions and other interesting subjects. Dept. 2270, 17% broadway, New York Cit: United States Rubber Company * This account of the coyote by Trapper Evans is the second of a series of his experiences with wild animals of America printed for the first time by the makers of keds, They are not Keds @ unless the name Keds is on the shoe

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Detroit, MicHicAN

POPULAR MECHANICS ADVERTISING SECTION 123 ‘ , : ‘The Modern Craftsman Wonder Shop . oan 4 03 2 The C= = 7 =f —— ~~ s Ra, —

eese had ards me, . - and lists the advantages and privileges that t t ftemen. jat name when you get it—send il back | knowing all about _—. nai a wen, se nea yer craftsmen. Don't mise

f getting \. ; | Look out for imitations. There is only one Red Jacket—one ar vaiue Waco—one Wm. L. Aylward, Mastercrafteman ecial Crafts Course FREE Complete Wear. SPECTAL CRAFTS COURSE and blueprint service is free to t kle Red Jacket Shop owners—all that there is to know about OOKIET handicraft methods, raw materiale, woods, carving, sawing, f > f _ turning, designing, carpentering, decorating, is taught by of intor special correspondence sports, uy Your Own Terms Only $10.00 down. Liberal discounts for cash. Easy monthly sugges payment plans. It is no hardship to own a» Red Jacket. teresting THE COUPON 70, 1790 Top FREE Interesting Literature Free

Send th oupon. You will be surprised rk Cits Table Biue wit h all it contains. Beautiful, Instructive, ~_) Prints Fascinating, Interesting. jompany coyote by eh 4 “rer ?Titrtitertittittete ee ea ith \ red f : de WACO TOOL WORKS, Inc. 5 0 Secs, 542 N. Parkside Ave., Chicago Manager, Dept. 106. Please send me all free information and literature on Red Jacket Assemblies. This Head- stock fur- nished where no electricity is available.

“a, The most elaborate and unusual drill motor ever designed as driving power.

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Copyright, 1928, by United States Rubber Company unless the name nedas 1S on tne SiLOE 124 POPULAR MECHANICS ADVERTISING SECTION

Adana Automatic Self-Inking Printing Machine NEW ALL-STEEL lem 4 SUPER-MODEL > had Complete

Build and Fly this 3-ft La i a . Model of .ite LINDBERGH'S Built from the experience of over 10,000 Users of the old Model.

oe ” Over 15,000 users of « New Yor “Rain, Plave, = SPIRIT OF ST. LOUIS Adana Printing Plants, saving in their own work, and hun- Plane, ( a3 JN4D- Fipyt ny tng S Ng iy Png. dreds making an excellent living. Will print any matter from , oH AY in which Lindbergh crossed the Atlantic Ocean. Any bright boy can build thismodel:

Chemist’s Label to An Illustrated Magazine

, , . = iot. . Taube or Niouport The IDEAL Construction Outfit contains at a really good speed, including Perforating. Simplicity to the yy sol Seo everything needed: all parts, fittings, ma- extreme, no special skill required. Large numbers of boys pro- — ee et eee The mod's c ‘ iad : ‘ % - ae on } ons, é é 8. 100e jucing school magazines. Government Departments, Large HOW TO wonderful; has many features of the original Printers and Big Stores are amongst the many successful owners. BUILD AND FLY and is guaranteed to fly 7 50 ' THE $19.50 PLANT COMPRISES : MODEL AIRPLANES Comptcte Construction Owtat Machine. Complete as above with padding cards. —_ | gene Cse.. 20d te Chasen, id ts 08 Type. The finest Printers’ metal type. Three complete sets. Each set sk your dealer or order direct. inctades composition of all letters, figures, signs, points, and spaces, mak- ing a total of nearly 2,000 pieces. Type Cases. Three Fibre Cases to take the above New 64-Page Book of Model Airplanes Teaches the principles of flying; contains plans and die Spacing Material. A set of both wood and omeal, all being machine cut to rections for —— = aore and racers, and - informa a standard system of sizes so that type-setting for cards, billheads, note- tion about scale Mod of real planes; alec et com headings, labels plete catalog of mate -~4 for model builders. Sent 3, etc., is as simple as building with boys’ toy bricks Ruling Materiat. A smal! set of brass rule for fi ogether witha —_ e of perforating rule Wedges for Locking u: a, -% Steet tray for type potting. 3 patent Reiotertng &S In Large Tin of Be - Bla instruction Book ro Tasely ected. 20 Page

ne, heavy and dotted lines; *{DEAL AEROPLANE & SUPPLY CO., Ine 26 West 19th Street New York City MEN WANTED to become floor surfacing contractors—Pay averages $30.00 per day—no lay offs—your own boss—work the year round—demand ever increasing—New “ American” machines do the finest work and are easiest to handle Complete information sent free without \ obligation. Write today AMERICAN FLOOR SURFACING MACHINE COMPANY

Obtainable direct from our Warehouse. Dept. P.A.4. THE ATLAS SHIPPING COMPANY 11 Broadway, NEW YORK State if required Sor Tropical climate when harder inking rollers will be sup- plie AU other communications to be addresse THE ADANA AGENCY which is a complete oreaan oon for the supply of Equipment of every descrip- tion for the small Printing Dept. Controlled by pees ney Bee skilled” a pone. experienced men of the Printing world having expert t part of Letterpress Printing. Owned and Grested oe D.A. SPINALL. (Dept. PA4) 17 Church St., TWICKENHAM, ENGLAND Information on any book free. Write Popular 523 S. St. Clair Street Toledo, Ohio Mechanies Press, Chicago, Il. NEWAUTOMATIC Wow AT HOME 7 ns-Dries-Polishes | Many models of genuine MOVIE MACHINES, some

N = S———[—=

as low as $3.75, all using standard size big theatre films Our stock of films is the most complete and lowest in price—with an exchange service. Films of leading stars Amazing new invention com- and religious subjects are available. DON'T DELAY pletely revolutionizes window ‘7~Y 9 WRITE FOR FREE INTERESTING CATALOGUE washing. ye Meow eter ‘ ~y NOW! supply! eliminates a 18 > / my ~ drudgery and unpleasantness, | \ PARAMOLU NT MFG. co. Five times as fast as old methods! | sal Dept. 1371 BOSTON, MASS. Me No = _ —_ No No Your hands never | touch water with the NEW AUTOMATIC. Can be used with or without pole. Every | |

housewife, auto-owner, storekeeper and fac- tory owner a live prospect. Sensational dem- , onstration. Sells of sieht. Big repeat busi- ness. Year $907 MAKE $9 oto $150 A WEEK! Agents coin eg © proats, Going like wild- fire. Sells for only $ Liberal profits for agents. ote o $25 “yt easy; $200 to $300 ssib WRITE FOR OUR FREE SAMPLE OFFER You risk nothing. Don't delay. Write for money making proposition today. NATIONAL INDUSTRIES. Wriglev Bidg..Dept. 15, CHICAGO Any one can earn $2,000 extra mone yoosty in view of low price. Up to date * les, vorkmanstlp. Variety of beau- iful pattern 888 Co. - Dept. F-7,FortWayne,'nd. fy Do Your PRINTING Cards, stationery, circulars, tag, labels, paper. Complete Outtits, $8.85 up, Job Presses $11 up, ‘Rotary $149. Card (af “KE Cutters, $3. Save money. Print for others, big profits. Alleasy rules sent. Write for catalog presses, type, paper, Ls rete. cards, ink ete. THE KELSEY CO., T-36, Meriden, Conn.

Direct at Factory Prices Sample $1.18 3 for $3.00 Postpaid Hand Forged Razor Steel Blades Send for our 100-page FREE List and

ni Genuine $2 Knife fer $1. : y shaped Blade makes this knif, f = — and farmers; light but strong: re-shar od aaa sca tek re eee <= andle. German silver finish: blades file tes: . hand a forged from razor steel and warranted. a Maher & Grosh Co. : — _ = , 106 A St., Toledo, Ohio -18 Postpaid

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SRE IE TET PES SR csceeesesehieoesnasaees oe The most elaborate and unusual drill motor ever designed as driving power.

POPULAR MECHANICS ADVERTISING SECTION 125

“Why shouldn’t Starrett have the right dope!” 2, Obie “The World’s Greatest Toolmakers certainly ought : : ” —— to know how good, accurate work is done.

VIE Starrett Volume I for Machinists’ Apprentices gives you ae just the information you need in interesting, get-at-able a_i form. Volume II for Machinists gives more advanced in- Jowest in formation for experienced tool users. Volume III for DELAY Motor Machinists and Auto Repair Men is just the thing ALOGUE for men who work on cars. MASS. Your tool dealer will show you the Starrett Books and — the Starrett No. 900 Apprentice Set. Write us for your copy of the new Starrett Catalog No. 24“AP” illustrating and describing more than 2500 Starrett Tools.

Starrett Apprentice Set No. 900, in a handsome folding leather case, is made

a co up of 6 inch Combination Square, com- THE | * Ss. STARRE . plete; center punch, 6 inch flexible steel Ca World’s Greatest Toolmakers a in So eS 4 a NG Manufacturers of Hacksaws Unexcelled pon <r aia mon perm rye Complete Steel Tapes—Standard for Accuracy nil ah alt ans, 149. Card ATHOL, MASS., U. S. A. g profits e, paper pn, Conn. ices stpaid Blades ols Ast and ag Co. Ohio

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—_—_—_—_—_——e—_ev—s OS Vessel Oe 106 A St., Toledo, Ohio 126 --..Just plug into any electric light socket.... You don't have to That's all there is to it. fuss around with a brush any more—and you don't have to invest in an expensive com- pressor and storage tank in order to have all the advantages of spray painting. The Electric S -or the home prayit is ideal for ‘the hop Sprays any finish, stain or other liquid preparation of proper consistency, including bronze ;, enamels, lacquers, you a better job Order yours today ery line of in disinfectants, or dry powders. Gives in half the time with less material —for sale by jobbers and dealers in ev dustry, or from our factory direct Over 10,000 satisfied users to date THE ELECTRIC SPRAYIT CO., Inc. 320 Colfax Ave., E. SOUTH BEND, IND. WE +3450 complete Sprays paints, lac- quers, bronzes, enamels, stains, shellacs, varnishes, oils, disinfectants, or dry powders. THE ELECTRIC SPRAYIT CO., INC. 320 Colfax Ave., E., South Bend, Indiana. (Send me an Electric Sprayit at $34.50 f. o. b. South Send COSend further information on Electric Sprayit. Name.. Address. ‘"P.M.6-28 POPULAR MECHANICS ADVERTISING SECTION Make $5,000 a Year in this New i 2” Business NY % boas AHere’s your chance uy we Sok eye )an amazing new | 4 Loy > +25 bod Se one with no comp ; . selling something that a Pi to men, women and cl l Palle eneratere ave re: - earnings anywhere from &7 . . to $125 a week Sensation at the CHICAGO FOOD SHOW ‘olored, deliciously flay amazed the crowds Amazing crowds everywhere s \ a magnet and you reap big I vari-¢ 5 seconds Puffles—crispy, crunchy, made in exactly Chicago Food Show A puffle stand acts like Sell Like Lightning Special Free The mystery of the Puffle Starting Ofer machine draws the crowd. For a short time we Placed in any window, in ® 12% 50 Ibs. of raw fla with each outfit — ~¢ ] stores lrue atc s candy tores, Grug stores, to start you in business for at beaches, parks, fairs, carni- nothing and pay you a vals—anywhere—it attracts profit as well Wr t instant attention. And you once for full details make $4 profit on eac h dollar’s worth of raw flakes PUFFLES, Inc. 27 S. Wabash, Chicago, Dept. 50A Sport Bodies for Fords AT FACTORY PRICES! ‘r= This Me ~ I $39. 50 in Gre klet A Prime Ate M odei SPORT FACTORIES, AURORA, ILL. SALESMEN! $100 WEEKLY SELL COX HOLDFAST SCREW DRIVERS Also 1 use in ) - or Rat t Handle. Sells . - Naiiiatete fen ok Garages, Radio Men, ete. Self Holding, Self Releasing. 8 50e and Proposition, S. J. COX, Dept. F, Franklin, Pa Petty, EASY SY MONEY 100625 Profit a Day for nad Others are getting it— why not [| you? Fairs—parks—busy cor- LITTLE ners—aviation fields—roadsides TO —every place you can set up INVEST A Business Of Your Own PLENTY witha OF TIME ; So Kingery Popcorn Popper Peanut Roaster Barbecue Machine EACH MACHINE a MINT of Nickels and Dimes Write right now— TODAY—for illustrated catalog—FREE THE KINGERY MFG. CO. DEPT. P.M. 6 CINCINNATI, OHIO

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POPULAR MECHANICS ADVERTISING SECTION 27 «tl A better used Car | Es} for fewer dollars vl This valuable free book “a |{ tells how to save money —send for it! figs WwW S' REWD buyers are taking advantage of today’s low used car prices to enjoy shown a quality ‘‘6’’ for Jess than the cost of a Pledge to the Public os new ‘4. . on Used Car Sales Ser You can buy a used car safely with the we an information pictured and explained in our ] Every used carisconspicuously matked with its perwen valuable book, ‘““How to Judge. a Used price in plain figures, and that price, just as the price of our new cars, is ngidly maintained. eta Car.’ The coupon below brings you this 7 fund of facts without cost. Experts who ne. buy thousands of used cars for dealers tell you what to look for and what to avoid. Much of this trade information has never rdse.: : before been made public. Since its first printing a few months ago, 9.50 125,000 motorists have sent for this time and money-saving buyer’s guide. The coupon below will bring a copy of the second edition of ‘How to Judge a Used KLY Car” to you without cost. A 2c stamp : may save you $200. Send the coupon NOW! 2 All Studebaker automobiles which are sold as CERTIFIED CARS have been properly reconditioned, and carry a 30-day guarantee for replacement of defective parts and free service on adjustments. 3 Every purchaser of a used car may drive it for five days, and then, if not satisfied for any reason, turn it back and apply the money paid as a credit on the purchase of any other car in stock—new or used. (It is assumed that the car has not been damaged in the meantime.) - ee THE STUDEBAKER CORPORATION OF AMERICA, Dept. F-72, South Bend, Ind. Please send me my copy of your valuable free booklet, “‘How to Judge a Used Car.” slin, Pa Name.... Street | | | | | | | om ee oe oe ee STUDEBAKER. ——__—=—The Great Independent———___—_. 5 sHIO

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128 POPULAR MECHANICS ADVERTISING SECTION

ee tn Adar ee You Let meshow youhowtomake \ , big money right from the start. I've prepared a FREE book explaining ail details. First week's profit pays for all equip- o_o — ment. You can get all the battery charg- I Y Set 160 Pe 9 ing business in your community with my > > Service Station Charger —it’s years ahead S our et a erc ente rs of ordinary chargers—handles 50% to 70% more bat- ae teries. I explain everything—st: art you ina OO many sets are delive ering only 60% of the business of your own and put you on the way tones broadcast by the studio. Most of the audio to big money. Write for FREE Book. systems choke off or distort the very tones which give C. F. HOLMES, Chief Engineer, Dept. PM that fullness and roundness which makes the difference Independent Electric Works, 5116 Ravenswood Ave., Chicago between ordinary and Natural Reproduction.

Link up your Tuner to Natural Reproduction with the companion units, The Amer Tran Push-Pull Power Am- plifier and the AmerTran ALC Hi-Power Box. You must hear it to appreciate it. Even your imagina- tion will not exaggerate the difference. Write for full information or ask us to arrange a demonstration at | your dealer's store, no obligation of course. AMERICAN TRANSFORMER CO. 151 Emmet St., Newark, N. J. Transformer Manufacturers for 28 years ME 20 Minute Car Washing Shops everywhere are adding pressure car washin TRADE MARK REG US PAT OFF Washes cars easily in twenty minutes with unusually

LIGHTING FIXTURES Ready to hang Direct from the manufacturer. Complete! wired, including glassware. Send for new catalogue No. 29. Just Reduced Prices. Specia/l Proposition to Deale Erie Fixture Supply Company, Inc. Station A E, PA.

large profits for you Satisfied customers advertise your business, Installed with practically no expense to you— /) COSTS ONLY $20 MONTHLY the extra profits easily pay for it. Beltless, Ball

Bearing, single unit construction insures long * > > life and trouble free operation. Write for oe - Details. No Obligation. ; . x > << Se HOBART BROTHERS i NO ONE CAN BEAT Box M682 Troy, Ohio

the enjoyment of building your own substantial and safe 20- — mileSPEEDboat,requiresbutlittlesparetime. We $29. 75 furnish the materials machined ready to fasten. Also furnish this boat complete at extremely low price. TRUSCOTT BOAT Co. - ST. JOSEPH, MICHIGAN DON’T WASH YOUR AUTO fa yr tm busines. ST nousands of ens DRY CLEAN IT and all highly polished surfaces with Kdw Borkosky of N. J. Write today TH E WUN DA WI PER HARDIN-LAVINCO., 107-17C Pershing Rd., CHICAGO —_ A chemically treated cloth. Removes | C t h Fi h! wl : a Ss road dirt and dust Without Scratch- a Cc Ss ing. Just as good for furniture. Eels, Mink, Muskrats with PRICE DELIVERED 75 Cents our new a weg! pane ena esean : + Sa STEEL WIRE TRAP. rite for our and Bargain HOWARD SUSTLESS-SUSTER OS. Catalog. $1 Box of our famous Fish Bait FREE to introduce our tr Agents Wanted 407 c Tires Soston. Mass. | WALTON SUPPLY CO., 3502 JUNIATA AVE., ST. LOUIS, MO.

Send for BIG FREE BOOK of Guarantee |! Plumbing and Heating. Everything cut-to- ft. 50 yrs. in busine ss. Thous: inds of cus-

: Reached the Age of 40# To these men, who are beginning to think about the time when they will want to stop working hard, we offer a vs aluable FREE plan that will help them get into a good, steady paving business of their own! You can start right out now making $15 to $20 a week extra cash in spare time, and soon build up a full time business filing saws by mac hine! FOLEY Automatic SAW FILER You'll get all the saw filing business you can handle from carpenters, contractors, schools, woodworkers, factories, farmers and homes, because a Foley makes saws cut even better than new. It’s the only machine that files h and, band, and circular saws Easy to run—no eyestrain. No canvassing. Write now for the FREE plan and complete information. FOLEY SAW TOOL CO., Inc., 228 Foley Bidg., 9 Main St. N. E., Minneapolis, Minn.

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—————————The Great Independent—— HIO POPULAR MECHANICS ADVERTISING SECTION 129 ileqaiac Just what you’ve been waiting for. = am | new, first quality Eb Alto Saxophone ® in beautiful polished brass, engraved, for Eas Only $8O in. CASH OR CREDIT— 5% Discount for Cash or C. O. D. Beautifu onds — Spec — Standard key system. Easy fingering. Accurate . Diam jal Values! scale. Marvelous tone and volume. Used by First quality Diamonds at a great saving! Daz- many professionals. New low price brings this zling gems of fine blue white color— all special most wonderful instrument in easy reach. Learn import stions—exquisitely set in mountings of solid quickly. Have fun. Ma e good money 18-k white gold. Buy direct from Loftis, the im- play for dances and shows. . porter, and save what others pay to middlemen Other Elkhart Models, C and Bb Sopranos, Order now—direct from this ad! > Melody, Tenor, Baritone or Bass at tisfacti equally low prices. Also finished in silver wii, o pat A or gold at small extra cost. Illustrated p : ~— for your u/, Folder-Catalog, sent free on request, shows t complete line and prices. Give this wonderful New Saxophone a week's trial at home. See how easily it plays, and how beautifully. Send full cash with order or K deposit pad we will ship balance C. O. D Satisfaction guaranteed « money promptly refunded. Easy terms arranged with re- sponsible purchasers, Don't cheat your ambition any longe You will never have a better opportunity. Order TODAY. ELKHART BAND INSTRUMENT CO. 11 Jackson Street, Elkhart, Indiana AUTOMATIC CONCERTINA ooea: (SMALL SIZE ACCORDION) BY tree Write ies, | INTERCHANGEABLE ROLLS Without any faint idea of music or notes, without study or practice, you can play perfect like an artist any songs, dances, fox trots, one steps, operas, marches, ete. Nobody can see the mechanical wrangement, everybody must think you are an artist. Wonderful tone, playing complete with all bass and accompaniments. Music iswanted and welcomed everywhere. Biggest assortment of Rolls, latest hits. Three models, for — Concerts, Paid Entertainers letely nd for duced calie , Inc. E, PA. osheteel $ $10 o ) Le oe $60.00 and free music rolls. Descriptive circular TREASURE SALES COMPANY New York, Ny. Cal, 30-40 6 Shot $9.75 s A ite.2. 6 Jewel pich »., $8.50 **To Be Successful, oe nah K RAG CARB I NE Wear a Genuine Diamond’’ All the qualities of a high price rifle. The choice No. 884 . No. 860 ‘ \> LY, of those who know. Fine w condition, all working parts guaranteed for one year. Send for our Free 50-page catalog Hu € RING of money saving values; Guns, Ammunition, Cutlery, Sports FOR N—An un- and Gov't goods. Outfitters for 50 years to leading Military usual value. Solid und Society Organizations, Theatrical and Wild West Shows \ 18-8 id set Go Satisfied customers all over the world. Terms Cash. No C.O.D woes Niant ‘7 W. STOKES KIRK, 1627-P. M. North 10th Street, Philadeiphia, Pa. Waite ‘ STUNNING DIN- eS bays pric = AGE” Handiest tool in your Bi Whites Sold with 8 dazsiling Biue workshop. White Diamonds. { 17 JEWEL ELGIN GLUE In bottles, tubes and cans. RAILROAD WATCHES No. 14, Thin Mode! ANTEED TO Pp: White gold filled, 20 year quality case; 3 size; silver dial: s 50 MARE.TON NE No. pay 21 Jew- els. Adjusted to 6 Positions. Goid filled 25-Year Qual- ¢55 ee ity Case 2.350 e Month. ELGIN’S LATEST RAYMOND. 21 Jewels, 8 KER Runs 40 hours one > $55 winding. 20-Year Quality Case ILLINOIS “BUNN SPECIAL.” 21 Jewels, Adjusted to 6 Positions. Gold filled 25-Year Quality Case. 60 bours, 1 winding eh 0 0 6 HOWARD RARROAD WATCH. 21 Jewels, 8 $80 Adjustments. Year Quality Gold filled Case Rauroad ite odd Guaaedeputer edt terme. BEAUTIFUL WEDDING Rimes SPECIAL LOW S. Mo. NEW» REBUILT EQUIPMENT Everything for ‘‘The Movies,” Ma- chines, Screens, Chairs, Generators and Supplies, QOomplete Stationary and Traveling Outfits. Free Catalog. Write Dept. M. MONARCH THEATRE SUPPLY CO 595 SO. SECOND ST MEMPHIS, TENN Send for Free Sotziog! Profit $1,000 Month Easily Possible!

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| i lk i , Be ee, Dee, See, « eee 130 POPULAR MECHANICS ADVERTISING SECTION "nol Rowing Fie thrill of angling when your heart is _Aéashed to an oar? But shiftthe job to a powerful » Johnson motor and you will wing your way to f/ fishing haunts as freely as you choose. The = é, Johnsons offer unmatched agility, dependability and power to meet your fishing requirements Write for catalog JOHNSON MOTOR COMPANY 2461 Pershing Road Waukegan, ii Export Division: 75 West Street, New York City Canadian Distributor, East’of the Rocky Mountains Pete:borough Canoe Co.. Peterborough, Ont., Canada West of the Rocky Mountains Hoffars, Ltd. Vancouver § models of Johnson Motors J ohns se Son briced from $115 to $275 Sold on free trial and time Outh ard bayment plan. All prices 0a Aig, M Ee, — Motors a f.o b Waukegan, Til WORLD'S LARGEST’ MANUFACTURER OF OUTBOARD “MOTORS a hoot the Best Gun Now Making $50.00 to $100.00 and Up Per Week Selling Our The New BENJAMIN is the finest air rifle ever made. GOLD LEAF SIGN LETTERS Unlike all others. Has amazing accuracy—shoots hard For store and office windows, board signs, trucks and far, It’s the original American genuine AIR operated and glass signs Ve also make to order seri i . i kes ¢ ress air to desired signs and business emblems singly or b rifle. One to six ee ee a thousands. A permanent business. No capital degree of power. Same force asin air drills and air hammers of experience required. Big Gemand in except you control the shooting force. Never ee > every city. Samples and Literature Free. springs or levers to get out of order, Makes crack shotsquick- 71-X W. Van Buren ly, inexpensively. Gives years of delightful recreation with CONSOLIDATED SIGN LETTER CO. CHICAGO, ILL utmost safety. At your dealer’s, or sent postpaid for $5.00, Shoot § Days FREE Bodies of Rare Beauty for F ords We give you five days, ammunition supplied, to test the New BENJAMIN. If in this time you ons believe it te be At Factory Prices! the finest air rifle you’ve ever seen or us and if you don’t and believe it is the one and only air rifle for you, return it, $22. 7 postpaid, and your money will be refunded at once, Write for Circular A-3 bed the NEW BENJAMIN _ |srorrracronirs AIR RIFLE ~~ WANT a new bus 8 profession of your with all the trade you attendtc? Then become a foot correctionist, in a few weeks e: irn big Income in service fees,—n t me nor chiropody—easy terms for home training, no further « needed, no goods to buy, no agency. Address ~ Stephenson Laboratory, 1 Back Bay, Boston, Ma SS. America’s Original Air Rifle 4 at your dealer’s or sent postpaid direct from factory on FREE Trial as above if dealer does not handle it--write for our wonderful offer. Get This Book and Details FREE ' BENJAMIN AIR RIFLE & MFG. CO. I ‘ 645 N. Broadway, St. Louis, Mo, j | Please send your amazing offer — and free copy of ‘‘The Shooter’s ! = > ! Art,”’ telling how to become a crack shot, how 1 i to hold, a and handle guns and guide others i in use of guns, i WE WILL TRUST YOU § Name ' | Pay As Low As $2.00 per Week i r 1 | Hendersons, Harley -Davidsons, Indias | Slightly used and rebuilt. Hundreds to select from. ! Address ee a ! Send 10c for list today. Gist en en an am an an an on on an ow oe —_ awa ome ow oe oe oe oe ed MYEROW BROS.CO., 1205 Columbus Av., Boston, Mass., U.S.4

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VEL a, Th. Bins nada a ‘ORS # ling Our RS s, trucks er script r by the Capital and in P. Van Buren GO, LL POPULAR MECHANICS ADVERTISING SECTION 131 LO Back to camp with | a handsome string We nap fished far up the lake and were loath to stop, for how those trout were rising. But the cook’s grim warning—why are cooks always rim?—to be back before six, persuaded us to — the “Old Town’ back toward camp. As we glided easily over the water, we were grateful to this fleet canoe which brought us back with time to spare. An “Old Town” is the ideal canoe for every | fishing trip. Light in weight and perfect in | balance. Strong and durable too. Priced as low | as $67. From dealer or factory. New catalog gives prices and complete in- formation about sailing oes, square-stern canoes, dinghies et Write'for free copy ‘today. Oi town Gat #-Co., 1866 Middle Street, Old Town, Maine. ‘Old Town Canoes a OEE Beautiful HOUSES and BUNGALOWS ——— CAN BE BUILT FOR AND UP This and many others in my new book, Building Plans for Modern Homes, will save you hundreds of dollars. One of the mostcompleteand comprehensive books t plans ever published by any architect. Neweditionjust off the press. Nearly 600 floor plans and photographs of Colonial FREDE RICK H. GOWING houses, bungalows, etc,, costing from $200 up; gives sizes and. on to build. ARCHITECT id .0o. 101 Tremont St.. BOSTON, MASS. become nist, b me er cat YOU r Week . Indians ‘om, }., U.S.A, This ts only one of hundreds of bar- 7 $45 Buys This Motor Cycle It's a Harley-Davidson, 16 H. P., twin chain drive, magneto and clutch. It - has power and can get up and go on > the open road at a speed which thrills. eri Bo fe ez gains in used motor cycles which you Sat) can get Send for Free Catalo AS tells o big b ins and tremendous values in used motor cyc'! Repairs quickly done otor cycles exchanged. SS ovethoniod. OliverCycle & Motor Co.,1045 N. Grand Ave., St. Louis, Mo. PIN A DOLLAR BILL TO THIS and get this genuine leather 5- window-pass case. Holds Railroad Passes, Auto Li- cense, Lodge Cards, etc. Ma- sonic or Shrine Emblem stamped on in gold free. Your name or other stamping 35c extra per line. Cash must accompany order. We carry Send for free catalogue No. 10 P. M.,of Books, Monitors, Jewelry; No. 11 P. M. of Lodge Supplies. We Have Been in Business 67 Years! REDDING MASONIC SUPPLY CO. | 200 Fifth Ave., Desk P. M. NEW YORK ahs Keep Your Money ——till you’re convinced. We offer a free 10-day test of this amazing shaving cream to prove our case. You risk nothing Gentlemen: When we first told you of the remarkable delights of Palmolive Shaving Cream, we advanced our claims modestly, leaving it to the product itself to “‘sell’” you. We told you “Don't buy—yet."" We asked you first to let us prove our case at our ex- pense. Eighty-five per cent of men, we find, who once give Palmolive Shaving Cream a trial, become wedded to it. And these boosters have spread our fame in every city and town Today we make the fastest selling shaving cream in the world. These 5 unique features 1. Multiplies itself in lather 250 times. 2. Softens the beard in one minute. 3. Maintains its creamy fullness for 10 min- utes on the face 4. Strong bubbles hold the hairs erect for cutting. Se Fine after-effects due to palm and olive oil content. Now mail the coupon We take the risk—not you. We undertake to please you . . . to win you in ten shaves. The coupon is for your convenience. Won't you use it, please? THE PALMOLIVE-PEET COMPANY, CHICAGO, iLL. 10 SHAVES FREE and a can of Palmolive After Shaving Talc Simply insert your mame and address and mail to Dept. B-1509, Palmolive, 3702 Iron St., Chicago, Ill Residents of Wisconsin should address Palmolive, Mil- waukee, Wis. (Please print your name and address)

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Wn cs ee ee ee -_——— == = AVR Tee FSS SVs — ee ee ee oe ed MYEROW BROS.CO., 1205 Columbus Av., Boston, Mass., U.S.4 132 POPULAR MECHANICS ADVERTISING SECTION

You Need TISIT The Liquid Solder TISIT removes all the fuss and bother from soldering. It is a liquid solder which is applied cold with a stick, no heat or soldering iron and dries in 20 minutes. and acid-proof—not affected by only known solder for aluminum. It is used successfully for repairing kitchen utensils, gasoline tanks, cracked radiators, cracked evlinder heads, radio aerials, radio con- nections—in fact, every place a solder is used. Thousands of bottles in use, without one satisfied user prove the efficiency of Ask your dealer for TISIT. If he cannot supply you, send us 50c money order or stamps—and we will send you a bottle postpaid. Money back if dissatisfied. LETELLIER LABORATORIES, Manufacturing Chemists Dept. E 119 Main St. E. Rochester, N. Y. necessary, Heat-proof water. The cis- TISIT

OTTAWA Loc Saw | Ce 39 Gs yer TaIs OTTAWA Gs. yorrawa # 2 Weed to velegite. | Saw 15 to 20 cords a day more work than 10 men, Mh mang Hy A operated by man or boy. Falis trees se 4 —saws | for other work. 30 DAYS TRIAL. Write toee ToremEE book and — saw offeg

ever made. ipped from wets = on of 10 bi bous.s. orsaw KANSAS Ortawa Mrs. Co. Reon! H ‘ 1 Witesve © By! Gr, PA.

WOODWORKING MACHINES Cabinet Shop Special No. 10 ‘290 With Motor You ought to have this handy Parks in your shop peg ss complete ma- chine designed like a big pre ducti. yn outfit at 14 the cost... Fits in a corner of your base- ment. Does any kind of cabinet and joinery work. Write for circular The Parks Woodworking Machine Co. 1500-40 Knowlton St. Cincinnati, Ohio Canadian Factory: 208 Notre Dame East, Montreal

| |

FVERY MOTORIST needs this CRESCENT, KIT

T Crescent Kit provides thre necessar ito! bile tool t duck is I otorist should T in the car peci hen touring or « t ed tr The tools consist of an 8-inch Crescent wrench, a pair of thin nose pliers and teel screw driver wit i | hich may be les for h work Ack rned at right ang ler to show you the Cresc« r hardware de CRESCENT TOOL CO. 210 Harrison St. Jamestown, N. Y. CRESCENT and Smith & Hemenway TOOLS Made under the supervision of and quarant by the originators of the Crescent Wrench

We supply @ Now you can convert that old Ford ggit Pulley alee car into a useful farm tractor without altering any Ford parts. We furnish the traction wheels, drive gears and auxiliary axle and mountings, ready toclamp on tothe Ford frame. Pulls 16” plow. W rtte for Free Particulars. Shaw Mfg. Co., Dept. 4506, Galesburg, Kan.

ARKOGRAF PROTECT YOUR TOOLS FROM THEFT Gh &. ey

Write with electricity any name or design on the hardest and finest tools anc a instruments, or any metal, like writing on par th pen or pencil Complete Outfit $3. ‘SO — Prepaid Anywhere ene prasting: a circular free. Write today. gen wanted. ARKOGRAF nt 0. 1171 €. Stark St., Portland, Oregon <2, or [T ONE HANDLE VANES THE | ne OF MANY nis 1BLE ITH ew FL Ex nol

4” square connection. Six #0 ocketa, 7-16", 46", 916" -1¢

$3 3.65, prepaid C.0. D. Han = ) C.O.D. Ante 1. Too! Service Sales Co., Box 4605, Ssltwoad Sta.. Portland. Oreeon

ROW BOATS From factory direct to you Prices: $2400 and up Write for catalog L-1 SPORT FACTORIES

: | | | ILLINOIS} AURORA,

2 | ——

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REDDING MASONIC SUPPLY CO. | ae Doin hat RE: eis _j| ee 200 Fifth Ave., Desk P. M. oe. ens bee ; POPULAR MECHANICS ADVERTISING SECTION 133 MONDS SAWS FILES NIVES STEEL NGSTEN MAKES THEM WEAR BETTER ORE-than-average tungsten is introduced into Simonds Hack Saw steel, with the result that Simonds blades have better edge-holding - © toughness and durability—than other hack saw blades . on the et. For lower costs and faster production on all types of y x metal cutting jobs, SPECIFY Simonds Hack Saw Blades for economy. SIMONDS SAW AND STEEL COMPANY ielaiioad “The Saw Makers” Fitchburg, Mass. Established 1832 rench BRANCH OFFICES AND SERVICE SHOPS IN PRINCIPAL CITIES a If you want to be free from worry about your tools, keep them safely ina GERSTNER Tool Chest . There's one you can use and one you “=~ 2 Willwant. Write for free catalog. I Alirtan Se c Rime ee CO Any Test wee SS mm We Stand Behind Them 7 Tools of phenomenal strength and wearing qualities. You can drive rivet punch through auto frame $25 To $50 nate Yocrown Boss! Per Day Drilling Wells! Cash in on demand for good wells in every com- 8 ARH Cut shaving off axle shaft with bearing | scraper Lock our wrench with any inity! Any man with mechanical turn of mind | other wrench and bring pressure until one in easily operate one of our drills, make big | breaks Drive 5° chisel through 1'.* mey, be independent, work the year ‘round! A machinery steel Your money back if tools fail to meet these tests. CORNWELL Quality Tools Hand made of finest Swedish Charcoal Process Molybdenum Steel manufactured to our famous Cernwell formuta. Forged, heat treated. hardened and tempered in oil . NOT drop forged and case hardened. ScuroeterS ceue i‘. saw ne Free Booklet—Mail the Coupon Booklet describing amazing tests Home or Small Shop oe eee OF tew hundred dollars starts you in this big pay- business—pay balance out of earn- ges! Write for FREE CATALOG de- ribing ARMSTRONG ALL STEEL WELL DRILLS—gasoline traction or on-traction models Write now—today—Armstrong Mfg. Co., 810 Chestnut St., Waterloo, Iowa. wiTHOuT these tools will be sent upon re- OTOR The saw is mounted on a neat uest Our Money Back oo” wood base and has a 7 'y-inch nickel é - cP plated tilting table which is easen- warantee is your as- a tial for inlay work. The work which surance that these oo” The Cornwell A ran ecomplished is tools will do ar Quality Toots Co., F ous. Has a ras everything @ Dept. Y, Mogadore, Ohio : of B toe, Sneet we claim. agi (Formerly at Cuyahoga Falls, Ohio.) Add = of : practi- of Send me new illustrated catalog with $500 -~ prices on full line of Cornwell Hand- 5 adio panels euch as ae Made Tools bakelite, sheet brars hard rubber, bone oe. ee eg ec ‘ Where Employed attach- inch sewing. Weight Name ment is : -4 only 21 pounds with- wanted out motor. We sup- Address... . For More Information Write for Our Scroll Saw and Tes! Catalog PLY * catslog of 250 ae State SCHROETER BROS. HARDWARE CO. Geicns with each 810 Washington Ave.. ST. LOUIS, MO. machine

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Canagian Factory: cvs Nore Vame East, monucal | eee FAL IVNIES PAV BERNA ERP gg 2B eww) —— $2 Down—$1.35 Week A fine quality, genuine blue-white diamond 1s set in the latest style, handsomely engraved 18 Kt solid white gold mounting 2 emeralds in sides. Money back if you can duplicate it for less ~ than size 0 anywhere se. = ee oe) —$69; $2 Deposit, $1.35 kly. 18 Kt. white gold Dinner ae set with 9 Diamonds. . «5a 25 Va 12 srenuine blue-white dia sapphires set in solid platinum in this dainty, handsomely engraved 18 Kt. solid white gold wrist watch. Guaranteed 15 jewel accurate move- ment. Other diamond wrist watches as low as $39.00. POPULAR MECHANICS ADVERTISING SECTION WILL YOU Accept $75°°aWeek? This great nationally known corporation, the leader j field in America, is now allotting exclusive territory on eit! a Spare-Hour or Full-Time basis to honest salesmen and saleswomen who furnish good references and who can handle successfully our various lines. Per and Commer Stationery, Commer and Professional Remo other Announcements, Ws Announcements and _ Invitations, three distinct lines of Xmas Greeting C sell respective ly to stores, banks, business h professional people and individuals. This is a life-time proposition on a very liberal and ir . ately paid commission basis, offering an opportunity for secure promotion in just a few months to a District Ma ship position where you will put out your own sub-salesy« and build up a permanent business of your own, wort! $6,000 to $12,000 a year. All necessary samples, stationery and advertising are fur nished at our expense Address immediately in full as follows SALES MGR. DEPT. 3 The Process Engraving Company, Inc, Troy at 21st Street, Chicago SEND NO After you get the | Take 10 days Money Back article, ay de- | to decide. If M °o N E Y posit spoaied to : you are not GUARANTEE the postman. If you keep it, pay weekly for one whole year. Don’t bother writing a letter. Just circle article desired, pin this ad- vertisement to a piece of paper with your name. and address NO RED TAPE—NO DELAY satisfied that the article is the big- yest bargain you ever got, return itand we will refund every cent you paid. A!! credit dealings with us kept strictly confidential 6% INCREASE per year is | in exchange for a larger diamond miss the money LOWEST PRICES-—EASIEST TERMS Try as hard as you please, you can not buy elsewhere and get as good value for your money. The terms are so easy that you will never Our guarantees assure you of full protection Writefor !t brings our large Jewelry Store Catalogiicn into your home. Tells how to buy diamonds hke an expert. Gives informa- tion other jewelers dare not tell. Our catalog gives $197.00 you complete in- formation about ACARAT weights and grades of blue-white diamonds, starting at the remark- ably low price of $197 per carat AGENTS WANTED: Earn $200 weekly. Write for details DIAMOND STERLING 2?arce C@: (Diamond Importers—$1.000,000 Stock—Est. 1879) 1540 BROADWAY, DEPT. 2487 NEW YORK RAISE BELGIAN HARES NEW ZEALAND REDS—Chinchillas—Flemish Giants MAKE BIG MONEY—We supply stock and pay you following prices for all you raise: Beigian Hares $2 each ew Zealands $3 each—Chinchillas $4 each— Flemish Giants $5 each. 32-page illustrated book, catalog and contract, also copy of Fur Farming magazine, tells how to raise skunk mink, fox, ete., for big profits, all forgl0c. Address OUTDOOR ENTERPRISE CO., Box 25, Holmes Park, Mo. We start you ‘In business land help you succeed New plan. No experience or capital needed. We furnish everything. Spare or full time. You can easily make $$0-100 weekly — Write at once Madison Shirt Mnfrs, 564 Broadway, New York | too CART- tun or self-defence keeps away tramps, RIDGES Frightens thieves, scares away dogs— a real home protector. Fool your friends. Same as an expensive automatic in construc- ‘e tion, finish, appearance, durability; automatic magazine loading and ejection of cartridges instantly and powerful report. Guaranteed absolutely . Send no money, Pay expreseman $4.99 for automatic with 100 cartridges, JENKINS, 621 Broadway, New York, Dept. 2 3-.)-6 o iggbave StrikeYo Y Make big money fullorsparetime. Just introd my amazing $3.98 Raincoat Bargain in your « munity. Every human being a prospect. Steady, year-round money-maker. Complete Outfit and Sam- le Coat FREE to workers. Write quick. . E. Comer, Pres., The Comer Mfg. Co., Dept. W-5131, Daylon, 0. AGENTS eror PROFIT GENUINE GOLD LEAF LETTERS guaranteed to never tarnish. on stores and office windows. I:normous demar large profits. Paul Clark says: Smallest day $28.7 R. L. Reel made $926 in two months. Write toda for free sample and liberal offer to general agent METALLIC LETTER CO., 433-B N. Clark St., CHICAGO A SHIP MODEL FOR $4 98 Build an exact replica of the historic 5 Maria or the Mayflower with your own h We will furnish the parts cut to fit and ready t« semble complete for only $4.98 plus a few cent ostage. No tools needed except a small har -arts for model of Constitution may be purchased for % Write for our tlustrated cata! MINIATURE. SHIP MODELS Dept. P-8, 3618-20-22-24 Baring St., PHILADELPHIA, PA Anyone can put the

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on either

Persona] nmercia] mmerc) i] 10Val and Weed g

You! ntroduce kur COM Steady, ind Sam- Dayton, 0. % FLT ERS it them

c Sant » har dy to cents f LAMM Ine for $é IELS PHIA, PA SRS Se i Vt wee! ew See iver Valens sh machine

‘= wwe ive miniature acroll saw City SCHROETER BROS. HARDWARE CO. Secitas wit yt b et ~~ 810 Washington Ave.. ST. LOUIS, MO. State. . ees

POPULAR MECHANICS ADVERTISING SECTION

OUTBOARD MOTOR BOATS—A complete line of strictly ae racing models, good for over 30 miles an hour. Also some entirely new models for general pleasure use with as: of 20 to 26 miles an hour. Built strong and durable and absolutely safe. Rowboats

$44.00 and up— The most complete line ever offered, at real money- saving prices. Canoes $48.00 and up— Some all wood, others canvas covered. Light, swift, safe, strong and durable. Choice of many distinctive color combinations. Motor Boats— With or without Engine. For Lakes, Rivers, Shal- low water and weeds. CATALOG FREE — SAVE MONEY — ORDER BY MAIL Please state the kind of boat you are interested in (30) TWO LARGE FACTORIES > <-—__ — THOMPSON BROS. BOAT MFG. CO.

213 Ann St. ( Write to $13 Bie St. PESHTIGO . TLA WISCONSIN [Esther Piece NEW YORK

LAND OPENING The Great Northern Railway will build a 75-mile branch in Northern Montana this year opening a million acres. Settlers will get the benefit of a $2,000,000 improvement—200,000 acres for sale on special terms. Write for FREE BOOK. Low Home- seekers Excursions. E. C. LEEDY Dept. 557 St. Paul, Minn.

CORONA IN COLORS! Beautiful Duco finishes. Write for new illustrated folder. LC Smith & Corona Typewriters Inc 612 E. Washington St., Syracuse, N.Y,

xa MUSCle¢ Absorbine, Jr. makes them limber Muscles, unaccustomed to long or sudden ex- ercise, respond quickly when rubbed with Absorbine, Jr. As the tension relaxes and con- gestion disappears, you feel like a new man. At all druggists’, $1.25. Send for free trial bottle W.F. YOUNG, Inc. SPRINGFIELD, MASS. Absorbine Jr THE ANTISEPTIC LINIMENT

| | }

bands of nerations, down to the , the descendants of Hans m Wurlitzer have carried on his work.

come om tence of manefoctere- er if Try € any Warlitzer Instrument’ in your * Own Home OU may now have any Wurlitzer instrument for a generous free trial in your own home. Examine the instru- ment, show it to your friends, play it as much as you wish. No obligation to buy—no expense for the trial. We make this liberal offer because we want you to try for yourself these wonderful instruments, the re- sult of 200 years’ experience in musical instrument Building Easy payments are arranged to suit your convenience. This is your oppor- tunity to try a famous Wurlitzer instrument in your own home. | Send for New Catalog The greatest musical catalog ever pub- lished Over 3,000 article every known instrument described and illus- trated; many of them shown in full colors. Gives you lowest prices and all details of Free Trial, Easy Payment plan. All sent FREE—no obligation Send this Coupon

ttle Saxon (200 Years Ago ¥ tm itis Saxon) lived Hans Adam W urlitzer, Master Violin Maker. His shop was a gathering place for musicians of the time, for he was 6 true craftsman When he died his shop passed into the his eldest apt apy resen

THE RUDOLPH WURLITZER CO., Dept. A177 117 E. 4th St., Cincinnati Send me absolutely free, your new illustrated catalog, with prices and description of every known musical instrument Also tell me how I may try any instrument in my own home and pay for it in emall monthly sums No obligation OME... cececcesecrecesesesesesessseessesess Addreas a : State Inatrument....... (State inatrument in which you are interested -

Copyright, 1928, The Rudolph Wurlitzer Co

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136 POPULAR MECHANICS ADVERTISING SECTION

PEED, sport, pleesure — never before have Evinrude motors giv- en so much of each. Four re- markable twin cylinder models: \ Speeditwin—16 H. P., only 85 Ibs., 4 6to 35 m.p.h. Powerincreased 100%. »Fastwin — 12 H. P., only 69 Ibs. 5 to 30 m.p.h. Power increased 200%, Fleetwin— 6 H. P., only 55 Ibs. A new motorideal for family row boat. 4to25m.p.h. Sportwin — 2. H. P., only 44 Ibs. World’s finest light twin, recommend- ed where younger children use motor. 3 to 13 m. p.h. Four 242 to 16 «ke Evinrude Boat Speed Guide tells you exactly which motor to buy to give you the speed you want on the boat youown. Insurance policy against fire and theft from $1.10 to $2. 10, depending on your model. Time payments—as small down payment as $31.1 puts an Evinrude on your boat. Write for 1928 Evinrude Year Book EVINRUDE MOTOR CO, Milwaukee, Wis. 2417 27th Street EVINRUDE

Taylor Ceebynite Compass Visible at night without the aid of matches or flash light rhe North and South points are prepared with a radix active compound, permanently luminous and plainly se« in the dark The dial is of floating design, the magnet needle being attached to its under side Jeweled cents Hunter-style case with automatic dial stop A reliabk handsome compass that any man will be proud to own Your sporting goods dealer has them, or if remote fron dealer, Ceebynite will be sent direct by us upon receipt price, plus 5c postage Send for free compass booklet Taylor /nstrument Companies ROCHESTER. N. Y., U.S. A. CANADIAN PLANT MANUFACTURING DISTRIBUTORS TYCOS BUIL DING IN GREAT BRITAIN TORONTO SHORT & MASON, LTD., LONDON

SQUAB BOOK FREE Breed squabs and make money. Sold by millions for more than chickens. Write at once for free 40-page book beautifully printed in colors telling how to do it. You will be surprised PLYMOUTH ROCK SQUAB CO.

NEW VEST POCKET ADDING MACHINE Guarantors 5 ors. ADDS, SUBTRACTS, ) MULTIPLIES, DIVIDES Costs only $2.50 each yet does work of $300 machine. Not a Tor but a real ine that everyone should carry. Made of steel and indestructible Milli F

fillion dollar e¢ pacity ts in pocket. Weighe + es, Will not make mistakes. So simpl hild can 7 operate. Instructions furnis —4 Be Q Go moder c.. ali os wit fi r = a) i) a) eS order y¢ achine = ROS 16 (ata atateravetay, —rwhnO ~1 oo naVaretetsveve’ SEND NO MONEY— Just name and address. We will ship Calculator immedi- ately On delivery pay post- man $2.50 (Plus few cents Post- : i 1s nd at 10

day trial you get your SANDS OF SATIS- k FIED USERS

This is the lowest priced practical calculator made, “Why pay more for infer tions?” Order from this ad -—=—=——— Mail Coupon Today — — I am enclosing $2.50—send adding machine prepaid Send Adding Machine C. O. D. $2.50 plus px see ue (10c¢ additional in Leatherette Case Name Address City State Write for big commission and territory proposition

ae 634 H Street Metrose Highlands, Mass.

izae ee AMERICAN offers you $65 to $90 Weekly!: This is your opportunity to obtain the fastest selling Raincoat line in America. Also Slickers, Topcoats, latest two-tone Aerotex, Hidelike,etc. All colors, latest styles FREE HAT MAKES SALES EASY Sell $10.00 Slicker for $2.98. Men and women cleanin up with us. We show you how. Outfit free AMERICAN WATERPROOF PRODUCTS co. @ Dept. 354 yr 724 Roosevelt Road

POST PAID f World famous Cross-Atlantie “Spirit of St Louis" model. Guaranteed to fly under own power. Very fascinating, educational, thrill- ing fun! Simplified easy construction set together in an evening wood covering, all dif alt fittings. « mater : SPECTAT "NTROD UCTORY 18- $2. 1-ft. Model—$1. 18-inch SINPLEX LINDY TYP? MONOPLANE 5O« Simplex. only 25e. All r satisfaction or purchase price refunded. Model Aircraft Co. Box M, Chillicothe, Ohio 12-inch odele guaranteed to fly to your

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THA, FA 10 ght Alic Seer et) Iter bie m oe tEE sold by at once nted in Tr prised co. | Mass. ;s— e an +2] aon yle v4 ning {2 fe) SERSeEReeeeeee — —| State inatrument in which you are intercated Copyright, 1928, The Rudolph Wurlitzer Co POPULAR MECHANICS ADVERTISING SECTION 137 ig 1 filament AMPERITE a Vol tage alone keeps tube filament voltage con- stant despite variations in “A” supply, Tube efficiency demands it. Indis- — with battery eliminators, ‘liminates hand rheostats. Simpli- fies wiring. FREE~ Amperite Book of latest construction data and circuits. Write Dept, t su -6 RADIALL CO., 50 Franklin St., New York IM PE RITE RFEG VS FAT OFF The “SELF-ADJUSTING’ Rhcostat This 148 Page Radio Cat- alog and Encyclopedia FREE Containing 75 radio hook-ups,500 illustra- tions, 1000 articles. Biuld your own with Rasco parts. The lowest prices in the country. Radio Specialty Company 98E Park Place NEW YORK, N.Y. TUBFS “201-A Ty; Tested & R 10ON An amazing value that can’t be beat! Latest 6 tube tuned radio srequency cire ut E Sy gpd selective és fore — te descrip- tive circular alue $60.00, our price $16.95. Write tod ay RADIO EQUIPMENT CO.,'549 S. Wells Sst. -, Dept. 10-F, Chicago Resistors for every requirement of the radio builder & engineer. Arthur H. Lynch, Ine., 1775 Broadway, N. Y. C. RADIO PANELS BAKELITE — HARD RUBBER Cut, drilled and engraved to order. Send rough sketch for estimate. Our complete Catalog on Panels, Tubes and Rods — all of genuine Bakelite or Hard Rubber. Mailed on Request. STARRETT MFG. CO. **é)icS0%m." You Can Easily EARN +150 4300 MONTHLY Roffts cOosTS Only $16 MONTHLY Pays for Itself—No Expense to You Biance Preties Bem caeret Sit the mnt for You bills in two and doubled his business. Start a money-mak- ing business of vour own biggest Mo M ike Jattery Charging the ney-Maker in your shop You can do it with HB 8 Auto and Radio 0) °° sonic Battery Business |: = oo from other s because you give a Good Now - in tter charge in one- third the time required by alf as much for current as old sk Ww bulbs to burn out. Start Now thers—only methods. No expensive costs vou h: 30 DAYS’ TRIAL AT OUR RISK Pays for Itself and a Profit Besides Where they stop they buy Bring ‘em to your Shop with Air Service better than the other fellow’s HB Silent win Air Service will do it. Only $11 for a few months. Increased business ‘s easily pays for it. Check No. 2 in cou- pon below, The best paying Auto Electrical work ts now available to small shops with this new low-priced HB Test Bench—that does better work and makes more tests than many benches costing $100 to $150 more Costs only a small part of the extra profits Check 0. 3 it brings $20 monthly. below for particulars. Paint ‘em for $15 and sell ‘em for $100 more rhat’s why HB Paint Spray is going into hundreds of Garages. Does the work of five brush painters Big profits in contracting painting interior decorating or production work No experience necessary Check No. 4 to get more details on this profit maker HB Equipment built in HB Factories does more and costs less. Any item can be had on 30 Days’ Trial and easy monthly terms. It pays for itself with a handsome profit for you. HOBART BROTHERS Successlul manulacturers ~sincel89I3Z~ BOX M68 TROY, OHIO Tear Off and Mail Today SSSSSSSSSSSSSSESSSSESESSESSSESESEEESE CESSES eee eee eee eee Hobart Brothers, Box M68, Troy, Ohio. Send me complete information on the items I've checked your thirty day trial offer—easy payment terms—informat on how HB equipment will increase my earnings No. 1 iB S Hour Battery Charger No. 2 ( HB Air Service No. 3 ( HB Test Bench No. 4 HB Paint Spray Name \ddress

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2. —s Bs el A Jj | 138 POPULAR MECHANICS ADVERTISING SECTION “KNIVES THAT BITE” NEW! A Remington Knife for Electricians and Radio Fans THis new Remington Knife is just what electricians and radio tinkers have been waiting for. A knife for real work, yet light and good-looking. Can't be beat for scrap- ing insulation from wires, making connec- tions, tightening up, doing odd jobs. Has one 3-inch sheepfoot blade, and a 24-inch screw-driver. The blade is forged from high carbon steel, razor sharp, and holds its edge a long time. One side of the screw driver is ground to a cutting edge. Safety catch prevents screw-driver from closing when in use. Nickel silver bolsters, brass linings. Although designed specially for electricians, it will appeal to engineers, mechanics, workingmen. A dandy general utility knife, handy around shop, factory, or in the house. It's the kind of knife that stands up—that lasts. Hand-honed and tested at factory. We cannot do justice to this knife in an advertisement. So ask your dealer to show ou the Remington Radio Electrician's nife. Note its hard, handsome, cocobolo handle. Test its razor-sharp blade. Note the screw-driver . . . see how strong it is. You wouldn't sell this knife for ten times what you paid for it if you couldn't get another. Knife No. R 4548 is a wonderful value for $2.00. If your dealer hasn't it in stock, send us his name and the price. The knife will be forwarded at once, postpaid. REMINGTON ARMS COMPANY, Inc. 25 Broadway - Established 1816 - New York City Originators of Kleanbore Ammunition Remington, ARMS AMMUNITION CASH REGISTERS € 1928 R.A.Co. MEN! @ Tough, Wiry Beards @ Fall Easily Before These Genuine SWEDISH Blades No more half shaved chins and necks—no more ten- der, scraped skins. Genuine Swedish VIKING Blades give quick, smooth shaves. MAN—what a differ- ence; you'll enjoy shaving now. Order with com. plete confidence. Cleaner and Better Shaving at Lower Cost Special Introductory Offer: Send only $1 for a package of 10 Genuine Imported Swedish Viking Blades for maximum shaving comfort. Guarantee: Try them et our risk—entire satis- faction guaranteed or your $1.00 bac AGEN TS: Write for Special Proposition SUPERFLEX SAFETY BLADECO. 8 Murray St., New York, N. Y. CUTLERY SERVICE MACHINES We scll every thine in plumbing, heating, hardware, paint, roofing and millwork supplies. Due to large-quantity buying, we are able to offer you Grade A merchandise at enormous savings. Satisfied cus- tomersinevery State. Send for our elaborate catalog—over 95 pages of surprising bargains. STANLEY PLUMBING SUPPLY CO., Inc. 400 N. 12th Street, PHILADELPHIA, PA. MAKE FORD Into The “LARK” $ 00 Red-i-Kut life Class—Snap Famous eure-fit RL D-J-KUT 5° life-size patterns and picture size patterns instructions show | ~ ye ean easily convert y« rd into this Fast, Saucy, Spor Car as thousands ha with easily obtained wate rials. No need to lay up the elect Seer ay Send 16 _— . an for actual body phote co! and new manual of other distinctive sport body patterns from 23. £0 up—"“RXO" *swing-Lo” irons, Topa and Windshields. ORDER RIGHT NO KUEMPEL COMPANY, 97 Kuempel Bidg., GUTTENBERG, 1Oowa ‘Fvery Man I can show you how to start earning $100 a week immediately. Salesmen are happy and prosperous—there is no limit to their earnings. I have started thou- sands of men on the road to financial independence. YOU ean make big money selling all wool quality suits and over- coats at $23.50 and $31.50— cannot be- duplicated at $40. Liberal commissions paid in advance—extra bonus money— steady income from repeat orders. I can make you a successful salesman—let’s start NOW —write for FREE selling outfit and full instructions. W. Z. GIBSOW, Inc., 500 ThroopSt., Dept. 1-516 Chicage

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alll | STARRETT MFG. COQ. “Chicago, m. ~ | | POPULAR MECHANICS ADVERTISING SECTION 13: C-O UTILITY DRILL The Makers of the famous cycle, single Leg oN AC, with C-O Garage Tools and Equip- Cord and switch: belt drive: 3- ment, known the world — jaw chuck; 11 x 6° Lench space; - ° 7 } * 23° high; weight 62 pounds offer you a | tility-Drill com- Bores holes up to %°: works in plete, ready for the job, for 9° circle; 24:° up and down ONLY $34.00 spindle run; 7'."° range on Not an attachment nor a Column; 1100 to 2200 spindle nakeshift, but a real drilling §Peed — Neca) ~ master J2ea! for garages. repair and (ole), 1 2) me service plants, factories, all engineers. amechanics and farm and home WwW Ready for Here's real drill value—just craftsmen. Order today or if ITH y read these specifications: Verti- you need more information M eum e) =] the job cal type motor, 110 volt, 60 write for circular. If interested in other tools or equipment for servicing auto- mobiles—write for the complete C-O catalog. CANEDY-OTTO MFG. CO., Dept PM. Chicago Heights, III. — $75,10$125.A WEEK Me Selling SUPREME Auto Seat Covers Manufacturer wants salesmen for Supreme Auto Seat Covers Also outdoor furniture and $8.50 Automati« Clothes Washer No experience necessary We show you. Simply take orders; make as high as $25.00 a day! HIGHEST Cc OMMISSIONS PAID IN ADV ANCE FULLY GUARANTEED Just plug into socket Great Fun ith Fun Model E AIRPLANES The ‘SPIRIT of ST. LOUIS’? MODEL We ar ‘ f ¢ make of READY TO FLY—$5.00 ather _trimmed— pos r en Quick deliverse ‘ fadetoscale—22" high liftwings, metal propeller, pow- en eee : ; erful two bearing motor, shock absorber landing gear ‘NE Ww FEATU RE ARCHES shipped ready to fly— guaranteed. Exceptional value id to 5 ; s. Fast eelling « sities > extra strong construction Learn about aviation : $s 50 6 ng big. »Don't pass this ops ty . with these actual flying models E oO T RNIS 1 D ait Also Fokker— Fairchild and Seaplane models. Specif; lalla ale B stag + E aU TRIT FU wheat 1 ee eae model when ordering. Cost only $5.00 postpaid in lutely FREE! Write for the FREE Outfit today ali 4 be lutely FREE! E Outfi Se a. ten cents (3 for 25c) for Racing Glider and complete catalog ADDRESS DEPT. 320-8 owing these real models of famous airplanes. Agents and jlealers—write for discounts © heen CLINTON TOY Company Su PREME AUTO SEAT COVER (0. Sars. Se OG CAVE, CONN, 1243 | So . WABASH AVE.. BASH AVE.. CHICAGO, yILL. | 0- Gives You All DOWN These Features ia aa then ie Pra os Brings Patented Snap-on Pads— the Seed six cents for 32 page catalog this Lathe ee hg gg Soa beauty of ig rye | poems ig a to You cementing } ound 3 only on ‘the od mater SYPHER MANUFACTURING COMPANY 2 ™ Automatic Octave y upthe Dept. D Toledo, Ohio | Key—always positive Perfect scale accuracy—every ane T tone always full, clear and true O” "Sted IS WONDERFUL l EN ION Hands never moved from one playing position converts any ordinary cook Easier to play because of many exclusive improvements stove into a gas stove. OXO- Convenient key arrangement. GAS is made from kerosene | *implifies fingering of rapid passages e . The Buescher is the choice of and air. Cheaper, cleaner and | ost of the great professionals, > 2 bec se of re r cording more efficient than coal. | Decause of more perfect recordin Re spon sible distributors wanted | Easy to Pay GL ORIA LIGHT CO., 111-6 No. May St., CHICAGO, ILL. Agreeable payments arra ngec dan ad 6 days’ trial on any Buescher S: “Greatest Sax” | | | phon Cornet rrumpet _ oo ne A BEAUTIFUL FINISH sand ion Sep amephene Deck ar 5 beagha a aero tame. Sort improves bodek pictures. Send ask for circular on any other in- phone, and I know now I A ours for sample and trument made the right choice It catalog of specialties. B t t tion and uescher Band Instrument Co n ' FRANK SCOBIE, 43-S, SLEEPY EYE, MINH. , . en 2539 Buescher Block, Elkhart, Ind. ‘ ‘ FREE BOOK—Send Your Name face Fhree ttiver, Mick Fo anaes enue cn ae an ae aoemamanan een an -— BUESCHER BAND INSTRUMENT CO. 4¢ BE \ SOLDERALL _ | 2539 Buescher Block, Elkhart, Ind | METAL (N PASTE FORM | ce ntlemen:— Without obligating me in any way please send m¢ | yur free iterature Mention ins rument interested it | | Age N instrume Every Electrical | Connection needs j Name | Solderall for perfect reception | The SOLDERALL CO., NEWARK.NJ| Bai eee j

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POPULAR MECHANICS ADVERTISING SECTION WNw5 Protect Your Ideas Take the First Step Today If you have a useful, practical, novel idea for any new article or for an improvement on an old one, you should communicate with a competent Registered Patent Attorney AT ONCE. Every year thousands of appli- ‘ations for patents are filed in the U. 8. Patent Office. Frequently two or more applications are made for the same or substantially the same idea (even though the inventors may live in different sections of the country and be entirely unknown to one another). In such a case, the burden of proof rests upon the last application filed. Delays of even a few days in filing the application sometimes mean the loss of a patent. So lose no time. Get in touch with me at once by mailing the coupon on the opposite page. Prompt, Careful, Efficient Service This large, experienced organization devotes its entire time and attention to patent and trade mark cases. Our offices are directly across the street from the U. 8S. Patent Office. We understand the technicalities of patent law. We know the rules and requirements of the Patent Office. We can proceed in the quickest, safest and best ways in preparing an application for a patent covering your idea. Our success has been built on the strength of careful, efficient, satisfactory service to inventors and trademark owners located in every state in the Union. NO CHARGE for Information On How to Proceed The booklet shown here contains valuable information relating to patent procedure that every inventor should have. And with it I will also send you my “ Record of Invention” form on which you can sketch your idea and establish its date before a witness. Such evidence may later prove valuable to you. Simply mail the coupon and I will send you the booklet, and the ‘‘ Record of Invention”’ form, together with detailed information on how to proceed and the costs involved. Do this NOW. No need to lose a minute’s time. The coupon will bring you complete information entirely without charge or obligation. MMe EE i SO OS A ETRE MEE

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POPULAR MECHANICS ADVERTISING SECTION 141 \lv Patent Law Offices just Across Street From U.S. Pat. Office

ag + i — .. ? Saree a t oe REE ier’ Above is a view of my draft- ing and specification offices where a large staff of ex- perienced experts are in my constant employ. All drawings and specifications are prepared under my personal supervision. nventors [nile for tue, Free Strict Secrecy Preserved \ll communications, sketches, drawings, etc., OO are held in strictest confidence in strong, steel, fireproof files, which are accessible only to authorized members of my staff. Feel free to } He & write me fully and frankly. Your case will To 0 Ww have my personal attention. It is probable E—— 1A BI that I can help you. Highest references. = gape AC BRiny \ Par; In But FIRST—clip the coupon and get my free PS eae ue -N7 i book. Do THAT right now. : . Clarence A. O’Brien Registered Patent Attorney Member of Bar of: Supreme Court of the ited States; Court of Appeals, District of lumbia; Supreme Court, District of Columbia; United States Court of Claims Practice confined exclusively to Patents, Trade marks and Copyrights » Clip this Coupon ad Mail it Now! CLARENCE A. O’BRIEN, Registered Patent Attorney 708 Security Savings and Commercial Bank Bldg., Washington, D. C.

2] wn | 7

<f Co Please send me your free hook, “ How to Obtain a Patent,’ and your “ Record of Invention” form without any cost or obligation on my part. Re a ee ee i ase eile ne Fe ei aa 2 ALONE MERE mmm

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142 POPULAR MECHANICS ADVERTISING SECTION ATENT TRADE-MARKS p COPYRIGHTS ~ Have You An Idea? < Our Offers: OF your’ invention YOUR FIRST STEP The inventor should write for our blank form “RECORD of INVENTION’? This should be signed and witnessed and returned to us together with model or sketch and description of the invention for INSPECTION AND ADVICE No Charge for the Above Information Our Five Books Mailed Free to Inventors Our Illustrated Guide BOOK How to Obtaina Patent Contains full instructions regarding U. S. Patents. , Our Methods, Terms, and 100 Mechanical Move- ments illustrated and described. Our Trade Mark Book Shows value and necessity of Trade Mark Protec- tion. Information regarding Trade Marks and un- jair competition in trade. Our Foreign Book U} We have Direct Agencies in ForeignCountries,and se- cure Foreign Patents in shortest time and lowest cost. Progress of Invention

Sue 518-519 Liberty Bidg. , Yi Description of World’s Most Pressing Prob- lems by Leading Scientists and Inventors. We Regard a Satisfied Client as our best advertise- ment, and furnish anyone, upon request, lists of clients in any state for whom we have secured patents. Highest References—Prompt Service —Reasonable Terms VICTORJ. EVANS & CO. PATENT ATTORNEYS Main Offices: 789 9th St., N. W., Washington, D. C. : Opposite U. S. Patent Office

TAA DODITT AP MERCTANTC. ANWVETDOTICING CrevTrTrnawn

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se- its TRADE-MARKS POPULAR MECHANICS ADVERTISING SECTION AND PATENT COPYRIGHTS IMPORTANT HAVE YOUR CASE MADE SPECIAL TO AVOID DELAY. YOU SHOULD HAVE YOUR CASE MADE SPECIAL IN OUR OFFICE to save correspondence, secure protection and early filing date in the Patent Office. Tosecure special prep- aration of your case send $25.00 on account with model or sketch and description of invention. Suite 1114 Tacoma Building “Our Chicago Office Our Pittsburgh Office Suite 514 Empire Building | bis Our Lawyers Practice in all U. S. Courts and defend Clients in Suits involving Patents, Trademarks and Copyrights All Communications and | CUR ORGANIZATION OFFERS Data Strictly Confidential. | PERSONAL S ERVICE Interference and Infringe- | By Experienced Patent Lawyers, ment Suits Prosecuted Solicitors and Draftsmen IF REF) VICTOR J. EVANS & CO. NEW YORK OFFICES CHICAGO OFFICES m| 1007 Woolworth Bide. 1114 Tacoma Bidg. | PHILADELPHIA OFFICES PITTSBURGH OFFICES SAN FRANCISCO OFFICES | 518-519 Liberty Bidg. 514 Empire Bidg. 1019 Hobart Bidg. MAIN OFFICES: 789-9th Street, N. W., WASHINGTON, D. C. | |i Gentlemen: Please send me Free of Charge your books as described on preceding page. Pre - =] ~-~—-—-—— = —— “—-— = — = a Our San Francisco Office Suite 1010 Hobart Building WHfiwmwrwyyy+feAaAawD WwMOoMruUVaANWroe aAanirwwwonrroiwie cw’ nrmevar

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144 POPULAR MECHANICS ADVERTISING SECTION PATENTS TRADE-MARKS + DESIGNS FOREIGN PATENTS MUNN @ CO. PATENT ATTORNEYS Associated since 1846 with the Scientific American ScrenTiric AMERICAN BUILDING ScIENTIFIC AMERICAN BuILDING 24 W. 40th St., New York City Washington, D.C. Tower BuiL_pING Van Noys Buttpinc Hosart BurtpinGc Chicago, Ill. Los Angeles, Cal. San Francisco, Cal oe Books and Information on Patents and Trade-Marks by Request. Associates in All Foreign Countries. Send us sketch or model for advice and e cost A patent. Our book “How to Obtain a Patent’ ’ Sent free. It tells how to apply for Patents, Trace Marks, Foreign Patents, Copyrights, etec.; gives infor- mation on Patent Procedure; tells what every inventor should know. Thousands of Inventors, who are our $300,000 For This Invention That's what Eastman Kodak paid for the Autographic idea Thousands of other inven- clients, are our reference. tions are needed and offer enormous oppor- CHANDLEE & CHANDLEE, 25 Years’ Experience tunities for earning fortunes. If you are of an s tt t inventive turn of mind why not concentrate on 410 : St. w ington, D.C. things that are really NEEDED. Get Raymond Yates’s new book ‘+3000 NEEDED INVENTIONS"? PA TEN | S HE ss invAmwerjea Costs only $1.25 and may start you thinking along the right lines. haa charge. a You'll get nowhere just fussing around. Concentrate on what the gervice noted for results, evidenced by many well known industries need, and on what the public wants. Mr. Yates'’s book 3 of extraordin value. Book, Patent-Sense, i. tells you what these things are. Send no money. Just write postal pe Ny tae Lacey, We PSt Week be. Cc. Estab. 1 Pay mail man $1.25 plus postage when book arrives. Your money back if you want it This offer limited. Write now and get on the right track. (Outside U.S. $1.45, cash wtth order.) a EDGAR M. KITCHIN BUREAU ofr INVENTIVE SCIENCE Attorney & Counsellor at Law Dept. 36, Wisner Building, Rochester, N. Y. Patent and Trade Mark Specialist 805 6 St. H. W., Washington, D. ( Booklet Free Highest References - A E “y 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 Lawyers Guaranteed Directory, Detroit, Michigan; The Lawyers and Bankers Quarterly, published by the Legal Directory Pub- lishing Company of St. Louis, Mo.; the American Lawyers Annual, Cleveland, Ohio. WATSON E. COLEMAN, oct ne REGISTERED PATENT LAWYER , e e at a rr AOT..hUCm TO OSG KA ore ATI OMPRT ara APART ea

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POPULAR MECHANICS ADVERTISING SECTION 145 Buy a BULOVA WATCH —the Modern war WHAT YOU DO— SEND A DOLLAR with Name and Ad. ess, and: aciet o note telling us some thing about y Simply state: rr +" long at address, (2) age, (3) married or single, (4) name and eddress of employer, ‘6 ‘nature of |) work, (6) bow long in emp’ All information held strictly confiden- tial--no direct inquiries to employer, t p| WHAT WE DO- ord P 6 S Fommench the hey by patra bang : To the Man with an Idea I offer a comprehensive, experienced, effi- cient service for his prompt, legal protec- tion and the development of his proposition. i aLiteare ea sedt Send sketch, or model and description, for otherwise retura. advice as to cost. Preliminary advice gladly be refunded. furnished without charge. My experience and familiarity with various arts frequently enable me to accurately advise clients as to probable patentabil- ity before they go to any expense. Booklet of valuable information and form for properly disclosing your idea free on request. Write today. IRVING L. McCATHRAN, Patent Lawyer Formerly with and successor to Richard B. Owen 200 Owen Bidg., Washington, D. C. 41-E Park Row, New York City TRADE -MARKS REGISTERED —PATENTS——_| Trade Marks, Copyrights, Patent Litigation Handbook with | illustrations, 100 mechanical movements. Sent free on request. P A E; N fe ALBERT E. DIETERICH I I formerly member examining corps U. S. Patent Office Don’t Lose Your Rights PATENT LAWYER and SOLICITOR each. Ganey ead To Patent Protection 27 Years’ Experience Wasiinaten. a. c. Before disclosing your invention to anyone send for blank form “‘EVIDENCE OF CONCEPTION” to be igned and witnessed. A: is ate yrney: BLUE BOOK ON PATENTS | |] werepresent hundreds of inventors all over the United - Flexibie transparent ca be hich protects t ne / movement. AND PRIORITY RECORD BLANK GRATIS. States and Canada in the advancement of inventions. MONROE E. MILLER PATENT LAWYER The form “Evidence of Conception,” sample, instruc- 411-2 Ouray Buildin . ASHINGTON, D. | tions relating to obtaining of patents and schedule of ELECTRICAL AND MECHANICAL EXPERT fees sent upon request. | 0 PER ife Li Buys | LANCASTER & ALLWINE bre-Life Limbs | |] 480 Ouray Bidg. WASHINGTON, D. Cc. ae TO. NATURE. BRACES MADE TO ORDER. AGENTS Ortgtnators of forms **Evtdence of Conception."* romesanpte WORMAN CO, giaiesindtis wits INVENTORS ,fROTECE 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 invention for INSTRUCTIONS. No charge for the above information. RANDOLPH & CO. 301 Victor Bldg., WASHINGTON, D.C. { .,., an (PE RERESELESERLE EEE EEE EEE ERE EEE EEE EEE EERE EERE EERE TT NAME___ a

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146 POPULAR MECHANICS ADVERTISING SECTION Portable electric planer for wood-working Fast This Workace light-weight portable electric planer is specially t built for amateur and professional wood-workers who want ty do Accurate accurate work at the least cost and in the shortest time. [t Economical speeds up every planing operation. Pulley drive or direct motor drive from any socket Propuct or J.D. Improved design includes many new fea- tures. Steel cutterhead, three high speed steel knives, bronze arings, rabbets 34%," deep, planer takes any stock up to 4’. Amazing low price of $25 (with pulley drive) puts this money-saver and time- saver within anyone's means. With 4 H.P.G.E. motor (direct motor drive), with 10 ft. cord and plug providing instant power from any light socket, $60 complete. Better work done quicker Tables raise and lower by hand wheels— quick and easy to operate. Makes pos- sible better, cleaner, more accurate work. Woodworking plants and piece workers use these machines on each bench to speed up production—you can work wood for any and all purposes with the “ Workace ” Easy terms—money back guarantee We'll send you the “‘Workace” for a smalj down pay ment, the balance on easy terms It pays for itself in better work done quicker and at less cost. If not thoroughly pleased send the ““‘Workace" back and you don't lose a cent. Write today for large illustration, complete description and terms J. D. WALLACE Co. Adams St. and California Ave. CHICAGO, ILL. $1000 Profit or Agents / Ss a eee.’ WATCHES & JEWELRY y— CASH OR CREDIT Here’s your opportunity to make an easy extra $1,000 in 90 days time, Everyoneis always think- ing of buying jewelry for themselves or as a gift for some dear one. Show them our pian of easy Payments. Show how they can have a beautiful dia- mond ring, watch, silverware or any jewelry they may desire and yet have 12 months in which to pay. You can earn to $200 weekly representing our na- tionally known house. Sell on cash or credit. We put you in the jewelry business for yourself. You make no investment. You merely take orders and earn very liberal commissions. No tk tfit matter what you are selling, this is your opportunity to make extra We will send ABSOLUTELY FREE by return mail everything necessary to start you earning LIBERAL COMMISSIONS atonce. We include complete outfit containing handsome catal e beautifully illustrated in colors, order blanks and full instructions to insure your immediate success. SEND NO MONEY. Just send your name and address—write today—NOW! STERLING DIAMOND & WATCHCO, 1540 Broadway, Dept. A158, NewYork, N.Y. It Costs You $4—You Sell It for $100 For every dollar invested in sugar you can get out $25 in cash if you own one of our CANDY FLOSS MACHINES Five models of new machines, and many good machines at sometimes less than half price. We also manufacture and sell other carnival, fair goods and concessions. We buy used floss machines. AUTOMATIC FISHPOND CO. 268 Langdon St. TOLEDO, oni0 | MAKE A MOTORCYCLE OUT OF YOUR BICYCLE with aSTEFFEY MOTOR ATTACHMENT. RELIABLE — ECONOMICAL—EFFICIENT. Easy to at- H tach.Fitsany wheel. Send 10 cents (or circujars. STEFFEY MFG. CO.., Depl. P, 3924 Fairmount Ave., Phila., Pa. DX FANS RECORD YOUR DISTANCE RADIO RECEPTIONS Prove your success to your friends with our RADIO DX MAP. A visible means of recording every station in U. §,, Canada and Mexico, on heavy mat board 13°x19", almost 1-4 inch thick, complete with 250 colored markers. Sent postpaid for $2.00. RADIO MAP C0 210-K WEST FOURTEENTH ST. mw LOS ANGELES, CALIFORNIA The SILVER ACE — FLYING MODEL . Wing Spread, 30 inches Weight, 5% oz. yn as ett ‘Build a Silver Ace Convertible LAND PLANE + SEAPLANE After two days work with our construction set you can go after long distance or speed records in scale-model contests on land or water. Sold ready to fly also, with or with- out the S1rverR ACE Pontoons. Ask your local store for a Silver Ace, the model that really flies, or send ten cents for catalogue. THE AERO MODEL COMPANY 329 Plymouth Court - Chicago FREE RADIO | BOOK: 40 pages chock-full of vital information for radio set builders. 14 new Aero circuits—receivers, transmitters, radiophones, short wave fully described. Com plete construction data, schematics, photos, et Exactly the book you've wanted. Write for FREE co TODAY. Address AERO PRODUCTS, Inc., Dept. 107, 1772 Wilson Ave., Chicago, !!!. nt ~~ E are in immediate’ need of several men and wom- en in every state to act as our District Sales Managers, full or spare time. No house-to-house canvassing. A dignified, respectable, good paying Position open to honest, reliable men and women. Write for details. No obligation. - BADGER SPECIALTY MBG. CO. in Spare Time jo S. Third St., Ft. Atkinson, Wis.

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POPULAR MECHANICS ADVERTISING SECTION 147 Build It Yourself! Send at ®@) QO HOME PLANS ! | aioe

ing Nook and Bath. ina tera: | = Get our low wholesale prices before you build. We furnish complete lum- ber cut to plan at mill; hitects’ plans free with rder. Saves you 30% abor cost and 18% imber waste. Save $200 to $2000. One guaranteed price cov- ers all—no extras. Many put up own homes. We also supply lum- }

berandbuilding materialfor 14.Q0-Page Book FREE! ,i".<.. any job. Write for free estimate. shows photos, floor ae fae ~ ifeations, Girect-trot-mill : ices on 100 PLAN-CU OMES. Also ask for books s Easy Payments on Gaseane, Summer Cottages, Barns and Poultry Houses. § Gordon-Van Tine Company 1 own a lot and have Garages and Poultry Houses : 1173 Case Street, Davenport, Iowa so! cash, write for easy 20 different sizes and styles. Easy to build. Plan-Cut : Sattsfactton Guaranteed or Money Back ms. Pay like rent & Please send me Book of 100 Home Plans. N, Ti No. 459 ° . Gordon: AN LINE 16x20 babe ae el EP Established 1865) ~ 14 1 4 PLAN-CUT Homes ® Address anneee o5050000900668

| —— ~~ BUILD BUSINESS WITH AIR

|Yourshopean have lfyousell tocar ownes, | | [SALLLAGE! ER MO] OR aad TE Costs Only $12 Monthly THIS YEAR | fora few months. Tire stores, Garages, Bat- tery Shops, Filling Stations, are making big } money with the new low priced HB Auto- matic Air Compressor—priced $75 to $100 i less than similar yi nt on the market. Ask for bulletin M 681—+tells all about it. Hobart Brothers, Box M681 Troy, Ohio MOTORCYCLES Price $10 and [Pp guschaced through our Operative | ae PF Plan for as low as $1.00 , taya down and a rd week P / Indians Hariley-Davidsons Ace : Henderson - 4? rum Dp 4 This summer you too, can play a band and Clevelands instrument. Vacation’s the ideal time ne ten cents for Bulletin A. etercycles chipped te all parts of the world to learn. Pan-American Trumpets, Saxophones, Clarinets, or other wind WALKER- INDIAN CO., 78 Brookline Ave., BOSTON instruments are so easy to play. When school opens you are ready for the band, or orchestra. Order a Pan-American (or any instrument of your choice) as they are moderately priced, factory- guaranteed, quality instruments. Free Trial offer. Easy payment plan Send coupon today for beautiful illus- trated catalog. Send No Money-Maiil Coupon.

“4

50 New Features. Years ahead of old style engines. Run on Kerosene, Gasoline, Dis- tillate or Gas. MORE Power—LESS Easy to Start—Easy to Use. 2to 30 H- P. Lowest Prices. Easiest Terms. Catalog Free. WITTE ENGINE WORKS 174A Oakland Avenue, KANSAS CITY, MO. 174A Liberty Street, PITTSBURGH, PA. CATALOG? Write today for your co 50% direct from Manufacturer oM iddleman’s Profit. SSE CIAL: 8 Room Phestriceer ready to hang, $24.50—Other bargains. UNITED LIGHTING FIXTURE CO. 83 Flatbush Ave., Dept. M, Brooklyn, N.Y.

Pan-American Band Instrument & Case Co., Dept. G-19, Elkhart, indiana. Send me Pan-American catalog of medium-priced band and orchestra instruments by return mail. I am interested in ELECTRIC trations [7}'egt)-14

(Name instrument here) . Name Street or R. F. D. Address City...

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148 POPULAR MECHANICS ADVERTISING SECTION LUMINOUS PAINT able cope orbitant price, have at last succeeded in producing thie remarkable Lu MIN Us PAINT. which, a; plied to the surface of an c emits of it wisibie in the dark. THE r, LIANTT ~ _ Quite simple to use. one—you can doit. A little applied to clock will enable you to tell the time by night. You can cost the push but- your electric lights, match ek in.umerable other articles; ifixes, Luminous Rosaries, etc. Small bottle, price . Into a trunk, under the bed or any- = yp Be LIKE ORDINARY CIG- sures’ more than hal mes (7 G00D LUCK RING |Anertes, eur Such tobac- ery REAL STARTLERS! The where. Lots of fun favorite quaint . fon, (Noat,” uefa handy. | unosermgn.. ter “tlh: wivuse of escohant gen fooling the teach- Made entirely. of metal, | two brlllast, fahing Mgome| CRey sppeer se, real, but wer, policeman or nickel plated. 3 tor 6Se | sparkic out of the eves, Baid to | oe-third smoked, the victim friends. NOVELTY BADGES | soot cin jet 2a pAStactes SURPRISE MATCHES More fun than Fad | fighting with your like erat n ore one can matches. Put up NeverFaiis. Ail6) e course on ventril- in bozes Lt 4 — 10c oquism, the Ventri . ALL FOR 10 CENTS As the victim ties to 7 .© |MAGICIAN’S BOX OF TRICKS Price 10¢ per box, 3 baxes for 25e, 12 for TScents. | Apparatus and Directions for a Number of Mys- terious Tricks, Enough for ) een Evening’s THE VENTRILO a little instrument, fit mn the mouth out o sight, used with above for Bird Colts, etc. Any- se ° Rubber Chewing Gum Can Do It is great fun mystifyi friends. Get this Conjurer’s net, and you will be the i — in your . It in the World, the apparatus for ten Sise of @ post- 10¢ pgs tricks, including T M age stamp, . BALL AND VASE TRICK @ 200 Pages. Stor 25¢ P.Pa. |e cdenballis placedinside and upon good ‘ is i and u It is just like a regular package of chewing | replacing the lid has disap; um and looks so real thet it fools everybody. | and is found in someone 8 pock~ course no one suepects it is not genuine | et); The HINDOO TRICK CARDS until they start to chew it. There's a world | (can be made to change com : Ui Pesknee™ Bring Se Pages 3 tor | XrrtnitG Sint BOX Csi, seed tes woos to the ace. By ° t! vanishes 250; 12 tor 75¢ postpaid. entirely or changes into ® coin of another denomination) ; Brass GOB- LET TRICK (a coin is dro) into a of water and w' Pie a8k Lies sit 83 the gen of be sell 5g ot li hen the water is Wonderful X- Ray Tube | Fravost rash sus tree cat ieee! eras ae te BERD ON A erful little instrument ‘o- ely ribbons comes out of your ith); the DISAPP HAN DRERCHIEF to bandkerclief bald in the heral ¥ the WIZARD'S RING COIN TRICK; the ENCHANTE Seen: 7 to make it lay a jarge dice neath yet no one has teeked the vee . PHANTOM CA & > structions are sent for performing each trick. In addition to py tpl ot Sd hich you make or procure the necessary apparatus. complete $1.00 US. BABY TANK yy E me $= on S o 8 z 5 a es HI : ul above. . can easily postpeic own power if-& along, overeom- Bin: les, in the ame lifelike manner as thelarger Tankthat no. y in . What makes ; - tery, for ism to wind up as is hanical toys, yet this tank k ing _—e than the qvdinacy \— for toys i jorm come the most ul stunts; it will backward or { at will: 2%4 inches long. Price only 25¢ prepaid. SMITH ACO Look i effect be all that can be desired. Prices, poutine’ | 40 Bills 20c, 120 for 50c, or $3.50 t postp as "85 Comical Motto Rings Lots of harmless fun and amuse- Wondertu! instrument. Greatest yet.Nir t these rings. Made in | #4 separat piatinold to resemble plati- | ft isnt’ wick articl« i with ing on enamelold, | curie and twiste on 25¢ we LE ith & Co. | price ver box, 10c postpaic, 3 for 25e- Odd, curious and interest ing. Lots of pleasure as we! as very useful. It is a double Microscope for ex amining the wonders of nature. It is also an wis. Glass, a Stereoscope, a Burning Lens, a Readin« ase. | G . & Telescope, a Compass, a pocket Mirror, and : kad ia | Iaryngascope—tfor examining eye, ear, nose and throat. : t p— dg IV E Llp Re tt is worth ali the cost to locate even one painful cinder in th« games, sporting goods. rubber stomps, unusuel one | eye. Folds fist and fits the pocket. Something great—you oe CS CFS, Folds Ook oe iss Wek. aly Sto or 3 tor on Stamps ciso sccepted. JOHNSON SMITH & » DEPT. 824, .

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POPULAR MECHANICS ADVERTISING SECTION 149 ——HOME MECHANICS MADE EASY WITH THE NEW— “UP-TO-DATE HOME-CRAFTSMAN SHOP” This Outfit a Superior Development Over All Others The Up-to-Date Home Craftsman Shop can be used in any home lighting fixture, making of your old fashioned work bench a complete machine shop. Complete it is made up of a Super-Power Motor, a precision lathe (10° x 34°), featuring the bevel, & miter, side and depth gauges, a tilting table, jig- saw, and all accessories for buffing, sending. clean- ing and all portable or stationary drilling and saw- ing. This “ane will make you an advanced |

craftsman. faster mechanics have designed and skilled engineers have constructed this equipment which, after inspection, you will agree is the best of its kind. For those who build, invent, create and construct at home it is unexcelled OUR EDUCATIONAL AND BLUE PRINT DEPARTMENTS Under personal supervision of Master Crafts- man Eugene E. a. offers special correspond- ence crafts course, giving in simple detail full in- formation on home handicraft. lue print service giving plans and details for making hundreds of leces of wood handicraft included in this course "REE to our users. GUARANTEE After receipt of the Up-to-Date Home-Crafts- man's Shop, if you are not satisfied, without ques- tion or delay every cent refunded and return express charges paid. We elke | |3

MAIL THIS for full particulars to oe Machine Works 2915 S. Wabash Ave., Chicago, Iil. MANAGER, Dept. 9. Without any obligation, please send me full particulars about your shop, 10- day free trial, free blue prints, free crafts courss, also, $10.00 down pay mext offer. THE SUPER-POWER MOTOR The drive power of our shop equipment is positively the latest dev elop- ment in electric drill motors. It p uces 4 H.P. operating on 110, 220, 32 volt currents either A.C. or D.C. and is guaranteed not to! burn ‘out ot wear out i the ordinary use of home or factory. It drives the lathe, circular sa ‘ a 4” jointer with amazing power and durability. For further Seta on this Super-Power "Motor and the perfected shop it operates, mail the coupon at right TODAY. NAME

- ADDRESS

TO YOUR

= » feats ADDS fete) 13 GOB. cnet Sve Soller that will rise frum > BON by.own power. ft. or more ly of NG shes) ; inair $0020 qqeende. pore dab E {no 2or 3 hours. + needed. Con- DICE inder- EAT in- ee & pasily — Flying Cloud Model a7 yt 8 Here is an adding machine that sells so easily you ll say it's “‘like tte Mintetars model Galches 99) ens Gompicte handing you money You won't need any “sales talk'’—just we Blocks, Steering wheel Aree. Bell, Capstan, — ore. it sells! A real adding machine—mechanically right os ts, Flag, materia! Ss, , Brass wire or only os \ k Be. i Ping. te-coles ait materiale Yor Tack Tioaess Every Store and Office Desk a Prospect in the tus postage for 5 Ibs. Hull shaped and sanded At this low price every business man, every clerk, can have one coed opt agg Figure head Sle. Sapply catalog. on his desk. No need for a whole office force to depend on one a a) 4 | costly machine. Sell them an AD-RITE for every desk A ROY HANCOCK, 323 Douglas Ave., Portsmouth, Va. | ADDS_SUBTRACTS—MULTIPLIES han e AD-RIT Guaranteed for 5 Years = You don’t have to be a “high power” its { la in a Band salesman—you don't need any experi- i ence. AD-RITE makes you a one-call man right off the bat. All you have to do ful is show it—work ane state the price . , . wa. they'll hand you a $10 bill an eep the = ‘OLLOW Sousa’s advice atest ret AD-RITE ng and get into a band or or- 5 sa $00 Sells Not $150—nor even $25 vin chestra. With a Conn instru- os ; 0 Only $10——and it does the rate manne # rh AS ment, used and endorsed by nl 1 ° sles . : : > t cash for you. ~- Sousaand his artists, you learn y sales. Spo or you 4 to play quickly. Then profit F ll eee en en ee 4 and pleasure opento you. a Tell me your offer vo agents. and how I can get rel Conn’s many exclusive fea- e free AD-RITE sample machine. ex tures cost you no more. 4 2 EI: SIESTA EP | AD ing FREE Trial; Easy Payments. & Address Mea ees < Write for the free literature, . AD-RITE COMPANY the mentioning instrument. BAN 1517 E. 63rd St., Chicago, tl. you INSTRUMENTS j AS Cc. G. CONN, L&d., ee 4 6321 Conn Bidg., Elkhart, Indiana ———

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150 POPULAR MECHANICS ADVERTISING SECTION ' New Model Pocket Gen “ The | Westclox 1 watch | 150 ERE’S full value in a good-look- ing watch! The makers of Big Ben built it. The name Westclox on the dial stands for sturdy construc- tion, long life and excellent time- keeping. fi | Millions all over the world rely on Pocket Ben with confidence. So can vou. It’s an ideal watch for your vacation. Sold everywhere for $1.50. WESTERN CLOCK COMPANY La Salle, Illinois New Westclox }Auto Clock Attractive, convenient, reliable. Fits any car. Qui kly attac hed on dash or above 7; $2SO “windshield. Ae — “ Glare 7 Shield "gener Representatives Wanted EYE LEVEL AT A TOUCH OF Ree) ’ Makes Night driving Safe ~~ Easy Positively ends glare. Attached on any car i No installing. The «ma pe he in the fabric at the windshield. The GLAREZ Shield «t up until you touch the bulb with your to then drope instantly to youreye level. The clear green celos shield makes night driving as enjoyable as day SALESMEN Distributors-Dealers Make $10 to $50 a day and more fr the start. GLAREZ. like the automat “ - shield wiper, is destined to univers = ceptance Marvelous possibilities for Bpecialty Saleemen, distributors d dealers, who write now Pat. App. fer. GLAREZ isa fine quality prod- uct Constructed with precision andaccuracy appearance in keep- ing with the finest motor care. Re- duced 80 low that every motorist buys on sight Mailed post paid to any address in the U. 8. upon receipt of $2. A fine high-grade rubber tube, (almost unnoticeable) extends down from the little device above the windshield, fite on the steering post at the floorboard witb @ small bulb at your toe. Good for years of service. round Out Static wi SUBAERIAL Let Ground Waves Bring You Amazing Distance, Crystal Clear Tone Quality, and Greater Volume and Selectivity without Distortion. Sub-Aerial has brought a new epoch inRadio. Noneedlongertobother with troublesome overhead Aerials. Why risk breaking your neck to put up roof aerials only to have the first storm blow them down? Forget your Aerial troubles. Why not use the whole earth as a static and noise filter with Sub-Aerial? Costs No More Than An Overhead or Loop Aerial and less than many. Hook your set on to the newly discovered Ground “Wien ta Waves that bring practically static-free recepticn. Don’t stand for the squawksand tin pan reception you get from Air Waves when you can step right out and leave that stuff. If you don’t believe us, try it yourself. we're right—absolutely right test. We know so well Y T the surprising re- sults you'll get 3 S that we'll let you put in a Sub-Aerial entirely at our Risk. Don't take down your overhead Aerial. Pick a summer night when static and noise interference on your old Aerial are ‘‘Just Terrible.” If Sub- Aerial doesn't Sell Itself to You Right Then on Perform- ance—you needn't pay us a cent. Send for “‘all the Dope on Sub-Aerial."" You'll be surprised. Do it NOW. UNDERGROUND AERIAL SYSTEMS St. Clair Building Dept. 8-H Cor. St. Clair and Erie Sts. Chicago, Hl. If you do not find —you don't pay us a cent for the | |z>8 L wm >- oo» oa GC

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POPULAR MECHANICS ADVERTISING SECTION 151 EDWARDS ncorinc BIGGEST VALU E-LOWEST COST Buy your metal roofing, shingles, Spanish tile, sidings, ete., DIRECT from the world’s largest manufacturer of sheet metal build- i materials, at BIG SAVINGS. Thousands of tisfied users. We own our own rolling mills. Enormous output ng ires lowest production costs Factory-to-con- imer plan makes prices rock bottom. You get the e benefit. Many varieties. Edwards metal roofs last el e N yo longer, look better. Resist rust. fire and lightning. above fing, shingles, ete., of COPPER BEARING ur toe STEEL at special prices. This steel stands the det ~ acid test. Outlasts the building to which applied. an Amazing New salere Ready Made Garages and Buildings n the THAT PAYS len fos vy in cost. Easily erected. Permanent. Good- uP TO rs, @ ng All types and sizes to suit your purse and pose. Now’s the time for action. Write for Roof- ing and Material Book No. 150 and for Garage Book, 5 A —FREE— EDWARD MONTH SAMPLES R Ss MFG. co. 7 BOOKS 600-650 Butler St., a: ESTIMATES Cincinnati, Ohio Big Money Everywhere! HREE Chicago food experts have created a new kind of business in which any honest. industrious man or woman can make from $50 to $250 a week the easiest way you ever heard of. They have worked out a simple, complete and proven plan by which you ean immediately become the owner and operator of a big food business. You start making money the very first hour Works Like Magic! a —-- = fag aay Ps Rip Saw Bench Jointer Wood Lathe _ H & A Portable Electric cut-off See Woodworking Machines . . eenaaemedinenall Sew Part of the complete plan that will be sent you is a rdy bench type machines; move em rig! and plug into nearest ) » re , _@e > — > amp socket. Speedy: efficient: wave 16% of eet A tea tts ne wonderful invention of one of the experts—a machine ully guaranteed, Dealers in principal cities. Write for description and prices that cooks greaseless doughnuts by electricity NESTON & ANDERSON 606 Western Ave. Fairtield, lowe Everything you need to make as much as $1,000 a month. WINDMILL-RAINBOW -FLASHER A Remarkable New Food! SPINNING AUTO LIGHT —Spins with the wind. Red, White and Blue trick light. The greaseless doughnut is an entirely new food. Not Most beautiful light in the world. Every- a drop of oil or grease is used. It is a crispy, fragrant, body wants One. Auto, motorcycle, airplane appetizing doughnut cooked by electricity More canoe. Put on any auto in few minutes. Ra- captivating than old-style doughnuts—tich as pie or diator, mudguards, side or top cake—yet easily digested as bread Just ng me es ag A People literally fall over one another to buy these new you receive tne Basher Dius dainties. That's why Minch made $3,000 in 3 months Seo back Guarantee. Costopolis, Illinois, takes in $6 to $7 an hour in the GO LIGHT CO., 78 Milford Ave., Newark, N. J evening. Mrs. Jane Statts, Chicago, becomes the owner of a big shop in less than 2 months—All kinds of p tore”, xcople have coined money in this amazing new business t fromsenteorland “| : . Direct from The Secret of Big Money Practical men every- ota tee praee weather prpot. Mail coupon now for complete details of plan throug)! Tells time in dark. Fine imported full which many make enough money the first few days to jeweled movement, ich silver finish. pay for the machine—with profits up to $1,000 a ih ai month waiting for you If you are interested in a on NS ComPoRaTON steady income of $50 to $250 a week mail the ‘ork, Dept. '23 F coupon today. DEAFNESS Is MISERY —— — = ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee eg ! Food Display Machine Corp. ; Multitudes of persons with defective hearing and Head : be te A- — 500-510 No. Dearborn St., \ Noises enjoy conversation, go to Thea- ; shicago, js i treand Church because they useLeonard 1 Rush me proof of $1,000 a month. Also send details Invisible Antiseptic Ear Drums. Tiny of your liberal co-operative Plan. i] Megaphones fitting in the Ear entirely i i out of sight. No wires, batteriesor | N \ head piece. They are Unseen Com- ' NAMC. ce cee eee eee reer ene eenennneees forts and inexpensive. Write for 1 1 booklet andswornstatement of the ‘ Ef pam ore 1! inventor who was himself deaf. A. 0. LEONARD, Inc., Suite 699, 70 Sth Ave., New York

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POPULAR MECHANICS ADVERTISING SECTION * go00INUsE’ SAW AA A SHOPF UL OF TOOLS WITHIN ARMS 7 ld sow meena WHEEL , SAW GUARD AND ORILL AT~ TACHMENT N THE short space of four years, the Devitt 8- Inch Combination Saw has become r.0.B. PHILA a practical necessity in thousands of shops, " factories and households everywhere. Many imitators have sprung up, but Devitt leads them all. Think of the convenience and economy of this handy little machine that will rip, cross cut, bevel, miter, groove, mortise, tenon, drill, rabbet, grind, buff and polish. Attachments are easily and quicky adjus ted. The and motor, when set up for work, occupy very little room. ee is equipped with 14 H.P. 60 cycle, 1750 R. P. M. 110-volt A. Motor which can be attached to ordin: ary light socket, “i pro- vide power for other purposes when wanted. A cut up to 214 _can be made without planing. Comes complete with following attachments—12’x16” table,.8” Combination Saw, iron pulley for saw table, 10” ripping fence, adjustable cut off miter gauge, motor- specifications as above, 114” endless leather belt, wood pulley, 8 ft. cord and plug, 6” buffing wheel, 34” 3 jaw drill chuck, 5” emery wheel, 6” sander, saw guard, and 2” dado insert. $35.00 O. B. Phila. Height 714", shipping weight, 100 lbs (Only $12 extra for Planer Attachment to fit on table top. Can sm to 2 inches wide. Price, F. O. B. Phila.) Send today for our attractively illustrated 4-page circular a ee 1102 SOUTH 2no ST. PHILA,PA. Your Coat and Vest Can Be Matched with New Trousers Get full wear out of that good coat and vest by fo buying New Trousers to Match You save the cost of a new suit. Each pair tailor to your measure Over 80,000 patterns to cl from. Mail vest or sample of your suit and we will submit sample of cloth for approval. We employ no agents. ACME PANTS MATCHERS Dept. BS-14,20 W. Jackson, Chicago- -76 TACHMENT ON SAW TABLE Saw SHOWINC SANDING DISC ATTACHED % TILTED FOR ) BEVELING 0th I ieces up Enclose return postage if vest is sent. Be independent and make big profits with the— NEW IMPROVED BEISSER KEY MACHINE You can start a business of your own, no experience necessary. The only key machine that cuts ALL kinds of keys. No hand-filing. Make first keys by number without taking locks apart Locksmith instructions fur- nished free. Write today for Full Particulars. BEISSER KEY MACHINE COMPANY 407 Fort St. East Detroit, Mich., U.S. A. 21 Jewel Burlington — Nothing lese than 21 Rub id Sapphir: ls oa br a) Quality and Style Adjusted to the second— rature—tsochro- pism—positiens. 25 year Got Strata Case, in 160 designs. $i ¢ $i a down 4 walgnee ia email monthly en SURLINGTON WATCH CO. Dept. A-135 19th St. & Marshall Bivd. Chicago, iinois ; pow’ KIT crt WORKS WHERE OTHERS QUIT. No job is too smal! for this remerkeb le edged tool, Works in the smallest and most difficult places to react Takes care of the big Jobs too. eas _— teeth will saw anyth ing Ry m bakelite steel. Everyone who has a hacksaw wil! find the KIT-H AW an! able time-saver. Actual siz« over allis 10 in. Blade is 1-32 in. thie “ Comes plete with handle and biade and two extra blades for only $1.00 pests JE ERS: Write TODAT for aatae of this interesting ropositior GEORGES P PICARD CO., Inc. OS Water Street w YORK city 2

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— — SnVentOor wav wes oes oe - A. 0. LEONARD, Inc., Suite 699, 70 Sth Ave., New York POPULAR MECHANICS ADVERTISING SECTION 153

Cylinder Outboard

We'll pay you for your old razor blades! NOT NEW ONES—we want them old, the older and duller the better! We want the kind you'd think no sharpener could possibly give a keen shaving edge. Our representatives use them to demonstrate an amazing new in- vention—absolutely nothing like it—an AUTOMATIC sharpener with a_ flexible Hone-Strop actually gives the TRUE barber stroke and instantly blesses dul!- est blades with the keenest pos- sible edge. Read this big offer New Mechanical Wrist’ arpens Blades Like Magic/ LE EVINRUDE’S sensational a new achievement. Develops (A) 18 H. P. — easily drives stock rac- » ing boats better than 35 miles per ay hour. Drives sturdy runabouts 25 m. p.h. Absolutely vibrationless. Dual ignition, dual carburetion, instant start- ing. ‘lerrific, zooming acceleration, excep- tional handling ease. Weighs only 92 pounds. Send for free book on the Three Great Super Eltos. Describes the 4-cylinder Quad, the new B Class Speedster and the famous Service Twin. Write today. ELTO OUTBOARD MOTOR CO.

Ole Evinrude, President Here's a light, handy device as different from ordinary sharpeners as Lindy’s “WI from Langley’s first crude flying machine. In | Mason Street Department AA Milwaukee the first place, it’s the one sharpener that both hones and stro; The FLINKER sharpens all makes (larger size for Durhan Duplex). And it’s automati turns blade on strop exactly like the master barber gives his razor its super-sharp edge! No “thread ing’’ of strop through holder—clever guides hold it! Can't cut the strop! A few pressure strokes, a few light ones-—-2 seconds and 4 Greatest Value Ever Offered S 1 your blade is marvelously keen. One blade will give you smiling G

M AC oY’ 5S Window shaves 365 days! We guarantee these things! The amazing new PASS CASE FLINKER BARBER STROKE SHARPENER offers the strong est money back guarantee ever devised No matter what you've Genuine Gold Corners tried—or what you now think—here’s a sharpener that will posi Morocco Goatskin Well made in every way. Edges turned tively give you a satisfying answer to every safety blade problem! and stitched; pocket for business cards; IT DOES ACTUALLY MAKE NEW BLADES FAR SHARPER AND YOUR OLDEST BLADES SHARPER THAN NEW! Shrine or Masonic Emblem FREE. Gold stamping, name and address, 35c. per line crag maand sages. sce en || Klere’s An Amazing Offer!

S Window Pace Case. ..... - -$3.00 Do this: Run an old blade over a hard surface, or cut wood, to 9 Window Pass Case...... .. $1.50 bend the edge! Then give it a few strokes with this device. You'll 13 Window Pass Case...... by positively find it keener than new! You're so sure to be amazed = Puss Case $2.00 and delighted the first time you use the FLINKER BARBER Masonic Books, Monitors, Bibles, Leather STROKE SHARPENER that we make you this astounding offer Goods, Novelties, Radiator Ornaments, We will give you 10 cents each for

your old razor blades—limit for each yerson 10 blades—which you subtract from the retail price—$3.90. sed | AGENTS balance for the sharpener. Try 5 days Test it thoroughly Then if like wil you don’t say it's the most wonderful earns sharpener you ever saw—if it doesn't e give you your greatest shaving joy 43 | send it right back WE WILL RE- e nh a on 0 as FUND YOU THE FULL RETAIL Jewelry, etc.—Wrile for Catalog No. 8. M A © oY PUB. & MASONIC SUPPLY CO. 35 W. 32nd St. NEW YORK Oldest and Largest Masonite House—Est. 1849 This new invention is selling Croft, Michigan n e day |

< fire $33

PRICE, $3.90! Whether you've sent ag Ee k : : . us one or ten blades, we'll pay you the ay Fg SR. a RS : (Affidavits on File) full price! Could anything be fairer? Obligats ~3 ' at le ope cago-76 This Simple Device Can Be eee eee an CD heind | antadwie, without risk? This offer is limited. we sdaniiagimes ——S Installed on All Cars Send TODAY!

i] AGENT S—Make | FLINKER SALES CO. °° S.fRotr wien.” 2 ~~ eee $15.00 a Day Guaranteed to Dept. D, 206 East Grand River, Detroit, a 7

Producing Distributors C ) Pelee 4. «5-12 -- 3 ond sugee Maden at 10 qaeteanah ontd'S.... ....+. Oot TRIAL COSTS You NOTHING ( ) Inclosed regular price $3.90 (I'll keep my old blades and make them better t t I new ee money making proposition. | Get FREE Tire Offer Write for Full Information Address Blancke Auto Devices Co.,154 E. Erie St., Dept. 805-H, Chicago Name.....+.+ +: PPPPTTVITITITITITITITITITITITL TILL .. Btate...

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154 POPULAR MECHANICS ADVERTISING SECTION Selling “Red-Hots”’ Always a Money- Making Business —And NOW a Regular Gold Mine! There has always been good money in No stove or fuel to bother with—no selling ‘“‘red-hots.””. Now here is a muss, fuss or dirt—just hook it up at NEW way of cooking them, that means _ the nearest electric service outlet. The more money—liberal chunks of it—sell- | constantly moving baskets roast wieners ing clean, sanitary, delicious, roasted deliciously brown—the bright, clean “red-hots” from the SAVORY Electric enameled machine attracts the crowd Wiener Roaster. With this machine you can and makes them stop look and buy. turn out a vastly better ’ product-—with ¢ wey — Small, complete and easily ry © — , Longs - SAVORY —, this new and better ge t o method of roasting “ red- stands selling the flavorless 4 hots” withtheSAVORY — Ke + . or a = _ wy » LEC TRIC-tx. Electric Wiener Roaster shriveled, Iried product, W will prove a regular gold IENER ROASTER mine for you. T .* . . SAVORY Electric Rotisserie Juicy roasts, delicious broilers, meats of any kind—all roasted to perfection in this SAVORY Electric Rotisserie. Portable, compact, sanitary and perfect in operation, it gets the crowds and brings in big money. Send for Details of These Machines At fairs, picnics, ball games, roadside stands, beaches—any place in a crowd these mac hines will draw the trade. Both have distinctive features that make them regular “gold mine”’ profit makers—and the price is right. Write for full di tails 93 Alabama Street SAVORY, Inc. svresto x": ‘ Makers of Quality DEE yore for 90 Years

Free Bulletin lists diamonds es low as $60 per carat, eat to aren coe salar A cut diamond, s et Burm ond Hankang im all the wor Liende money on d ei ue unpaid oans and other in -4 3 cash d direct with European Diamond Cu tters, Must sell NO WHY PAY FULL PRICES Costs Nothing to See Asay Digmond sent for absolutely free examination at our . No tg oe Md cost ted ot i in \ ice for Caigctivts distance, 7 rich thedral tone. Turn 1 dial f for tions. Completely m Bled tally a guarantee teed 7 rature, users’ testi o| Freelersiy SERCIAL, OFFER User MIDWEST RADIO CORPORAT ts Pioneer Builders or 407-DMiracoBidg.

=" gees coh ean snveynen span toda aa "Beplainn ue tat mond Bargain List. Use blank eaay for youre od mall. —LOOK— PSC PT ‘| BALLOON INFLATOR Fly balloons, balloon kites, sell balloons, GREAT FUN Address......-.-.------------------ --- | Special Spring Prices | No. 1 Inflator, 50c postpaid. ‘Tear out end Ses; Se Roy & Sens, sh 1969 ‘Be Bey Sulidina No. 2 Inflator, $6.00 F. O. B.—10 lbs.

BALLOON INFLATOR CO., Box 853, PROV., R. I. SAVE 30 TO 80% ON AUTO PARTS | 6-TUBE RADIO COMPLETE | Write us for prices on your requirements. Everything for the $34.75 to $66.66 car at prices only Warshawsky can offer!

Licensed R. C. A. Circuits. Shielded. One Dial WARSHAWSKY & CO. }3'5 ea, > Write for catalog. Big discounts to agents World's Largest Replacement Parts F pues Consumers Radio Co., Dept. 165, 4721 Li im Ave., Chi

JUST OUT Spors No. 9 Combination Pen and Pencil AGENT’S 66 Sells for $1.35. Make 8 different SAMPLE C $15 daily easily. colors.

eacentecd 2 years. Money beck if not us Soffa Zs ai =~ — a - Zs EF a ‘> Se =— ~~ a | Baas aw Sa Pen part e Y = fitted with Write for FREE WHOLESALE catalog. smooth writing STY LO point. F. SPORS & CO., 428 MAIN STREET, LESUEUR CENTER, MINNESOTA

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i crry cc POPULAR MECHANICS ADVERTISING SECTION 155 DELTA Handi-Shop The joys of craftmanship are made easy with this un- usually designed, carefully built shop with its two shaft motor that permits as many as three tools being ready for work at one time. You will be surprised at the ease and speed with which it accomplishes an exceptionally wide range of difficult work, due to the fact that the Delta Handi-Shop embodies No other shop offers so much so many unusual and exclusive machine-value per dollar features.

—. —_——_— Tee ll —— coat ta Send Coupon NOW! [essere orc ren | bd 858 3rd St. Milwaukee, Wis. Gratify your desire to make things. Develop your | Send me your illustrated color folder describing I these reative and inventive ability. Make money in full or Dalen Sank Seep. Tell ma about your Pree Tris ! a spare time. Spend happy hours in interesting, health- all ready to put to- All parts complete, $98

therin ew hours pleasant work, s at least half. Length 13’ 8°, including brass and beam 46". Finest materials: seneq- coupes foatentage any planks, Spruce frame, Oak keel, tion booklet, etc. F. 0. B. Nyack

et All ts cut to shape accurate- . Instructions make i easy. Send for Printed Matter—FREE HARTMAN KNOCK-DOWN BOAT CO. NYACK, N.Y.

KEEP YOUR LAWN MOWER SHARP wih a BERGHMAN LAWN $4 -95 .25

MOWER SHARPENER= You can e a Aare quickly (Pesteaid) use a BERGHMAN and get at wonderful results. It is adjustable and lasts Extra Money— Hosts of Friends—Loads of Fun Within Your Reach forever. Just a few strokes on each biade and I APPY DAYS are in store for you if you will only act

your mower cuts like new. PY on this suggestion! Che evenings , LAWN MOWER IN SHAPE THIS suusls eben on with wes etl heart, wilt of Guta: ooean by sending bey for this ney imocpenes. | snoments as center est at gatherings; nights of x 5737 W +--+ — co rant. joy making $5 to $25 to x work that is “‘play. Ee = ~- age AV. “age The Deagan Xylorimba is your Opportunity! Wonderful —— | Same and Money for home, in demand at dances and entertainments, yet | Broadcasting easiest of all instruments to play. No teacher neces- sary--you actually play simple melodies the very first day even if you cannot read a note of music right now! Earns {$60 a Week -- Ral; ah Smith Chicago, says: E.

Played 20 minutes at we ing. Ree eived Sm.”” L ago - . Hallmann, Reading, Pa., writes: “‘Made $300 in 5 weeks, —— fk my may - for live te: in os ery loc ality spare time. Had never p! d instrument before.’’ — yy viaKke 0 or more a year casity rug the in- fa) stantaneous automatic fire extinguisher—is led and Center of Attrac- SEND FOR BIG FREE BOOK! var w, bes a Oot - aft chout j a“ . . . ae u ' ms a at 1 it ea » ine umen ] 7 wanted in every home, store, theatre, garage, shop Gonat Gatherings ¢.... day trial that removes (risk! the wonderful Deagan’? easy school, automobile, etc. Cheapest fire protection avail- mm ayment plan. No obligation ~cenply & fill in ar ne mail the coupon able today. Within reach of al << ee se eene

i C. Deagan. Inc., “Dept. Liss, 1770 Berteau Ave., Chicago Send me, without obligation, full details of Free Trial 1 Qt. Size $5.00 2 Qt. Size $7.50 Recharged in a jiffy

Amazing 30-second demonstration ctinches sale—each one sold offer and easy-payment plan on the Deagan Xylorimba. sells others. Territory going fast Write at ence for wonderful N part Proposition that will make you big money ws ame — L t vith THE NATIONAL FORMETAL Co. a ———~te ? Se re PE RO En int. 6535 Metta Ave., N. E. Cleveland, Ohio

a oT

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MO Be Me a OB 156 IF YOU CAN USE AN EXTRA $20°° BILL write for this FREE BOOK You ean save $20.00 in no time by using SMOOTH-ON No. 1 to do your own household repairing—and in addition you will have that proud ‘ How to make HOME.“AUTOMOBILE REPAIRS I-did-it-myself”’ feeling. Here is what one enthusiast did with two 35 cent cans:—A $25 lamp stand loose in base, two big leaks in heating furnace smoke pipe, loose hammer handle, and three loose hooks in tiled bath room wall were all put into good usable condition at an average cost of 10 cents each for the seven repairs— and $20.00 easily saved over what would have been paid to professional fixers or for new parts. By using Smooth-On to make dozens of the simple repairs necessary inevery home, you can save enough to pay your radio upkeep, buy yourself or your wife a camera, a bull pup or some other pleasure-giving article that you would otherwise hate to spend the money for. rhe free Smooth-On Repair Book will show you how an astonishing number of home and automobile repairs are as easy for you to make as for somebody else, also how you can make cellar walls, concrete floors, etc., water and damp proof with Smooth-On No. 7 Mail the coupon for a free copy and get Smooth-On No. 1 in 7-ounce or 1 or 6-pound can from any hardware store SMOOTH-ON MEFc. Co. Dept. 37, 574 Communipaw Ave. JERSEY CITY, N. J. SMOOTH-ON MFG. CO., 574 Communipaw Ave., Dept. 37, Jersey City, N. J. Please send the free Smooth-On Repair Book Address 6 Return this coupon for a 28 FREE copy of Booklet | | SSS SS a 8 OS 8 9 SS SS POPULAR MECHANICS ADVERTISING SECTION SENSATIONAL 5 | Typewriter Offer DON’T SEND US A CENT—we'll ship you a genuine L.C. Smith fora 10-Day Free Trial. Put it to any test in your home or office—no one will urge you to buy. Compare it with any machine made. Then, if you decide to a keep it, we'll make you the LO T PRICE EVER ONFERED D 4.4 ive you EASY MONTHLY PAYMENTS so small you'll never miss them. The ONLY Ball-Bearing Typewriter Because of its_ball-bearing con- struction, the L. C. Smith is the easiest running and est wear- ing typewriter made. L THE q 1926 ATTACHMENTS. Guaranteed for 5 Years HIGHEST QUALITY re-newed n’t buy any typewriter until ou have tried an L.C. Smith ‘or the sake of your future satis faction, accept our FREE TRIAL OFFER, $3 WorthExtrasFREE By acting now, you get Tools, Waterproof Cover, valu able Home Study Coursein Touch Typewriter Free. Play safe. Use the ball-bearing L. C. Smith 10 days eters deciding on any machine. Write TODAY for details of our Special Offer and manual of typewriter information Smith Typewriter Sales Corp. 116-360 East Grand Avenue, Chicago E Make More Money With PieeniN Crescent Wood Working Machines You can perform all wood working operatior AFTER IO DAY FREE TRIAL y, speedily and economical Cc Senaanl Wood Working Machines. | able, convenient, sturdy, simpie, or from any lamp socket free bulietins of Band Saws, Saw Ta Swing Saws, Borers, Hollow Chisel Mor tisers,Tenoners, Universal Wood Workers THE CRESCENT MACHINE CO. 93 Columbia St. eetonia Obie MODEL SHIPS Build a beautiful scale model of the Flying Cloud, Constitution, Mayflower, Half Moon and others. Our construction sets and special parts will greatly assist the model maker and assure an accurate model. Large illustrated catalog containing reproductions of photos « various models together with prices on set hulls, blocks, deadeyes, guns, steering wheel rigging line, etc., sent postpaid upon receipt of 10 cents MODEL SHIP SUPPLY CO., Dept. G, Mineola,N.Y ONLY 1g 3 | This Husky Steel Dump Truck * West, of the Miss. or in Canada $1.40. GUARANTEED Kingsbury Motor-Driven toy! That me & strong, sturdy toy Heavy gauge steel, all joints 80 clectric- welded. Bo dy , tine | to e mpty contents P owerful SI motor drives swift ed. od-looking! | Finished in rv bright ora Dise w t ‘il Ask dealer—if he hasn t direct from ‘Kine sbury Mie Co., 83-5 My rtle § , Ke eene, N. H KINGSBURY Motor Driven TOYS Send 10c for novel Kingsbury Dise Wheel Eraser Complete Catalog Free _—

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Ta J er on- the Par- HE irs ed ntil ith tis- AL lu- lay ore ck ol POPULAR MECHANICS ADVERTISING SECTION On the trail of trouble WHEN you're hunting down the reason why the wheels won’t go round, you need that very best of mystery-solvers— a good flashlight. With your Eveready on the job, there’s a bright, watchful eye of light at your service, searching out the dark places that hide the important clues. Steal a lap on trouble, with ‘ WIS VStar, Sree | | the flashlight habit. An Ever- eady will start you. And Ever- eady Batteries will keep you well supplied with the most light a flashlight can hold. They’re loaded with light. They Say it with Service. They’re the kind of battery every flashlight ought to hold. Get genuine Evereadys. ® Motorize ¥ =. Your work shop’ SPEEDWAY SHOP"; woodworking shop. Attaches lam This. SpredW ay Shop is high grade, for monry-maker. Get full particulars. Write Magnetic Tool Company, Depart ment 22, 1830 South S2nd Ave., Cicero, Mlinois Adjoining Chicago). ew metal and ‘Qenteeence Why Not ATCUED es your RADIO REQUIREMENTS? Resistance is the aes 2 means in any radio circuit. Resistance must be of correct value—not a mere guess or ervde approximation. And that is where the Clarostat comes in It provides absolutely correct resistance for any circuit or condition You adjust it until ideal results are obtained—then leave it alone to func- tion as fixed resistance Noiseless. Foolproof. Long-lived. Ideal. Unique: re's a Clarostat for every purpose—from Volume Control circuits, to Power Clarostat for con- power amplifier or socket- stat for delicate radix g largest power supply unit, r receiver Write for literature on all Clarostats and how to improve your old or new receiver wanene ; American Mechanical Laboratories, Inc. Specialists in Variable Resistors a 285-7 N. Sixth Street, Brooklyn, N. Y. socket. $10 Down Easy Payments. | rm A 157 IWant toSend You a a Special- Watch fey (alee to see and examine Our 21 Jewel Santa : a “E Fe | Special Guaranteed Santa Fe Special Watches are today be- ing shipped to every Watch Senton 3C civilized country in the M4 world, are are prob- ably the best and most favorably known watch in both Army and Navy. In addition to our NEW LOW PRICE, I will send for your approval one of these Standard Watches, guar- anteed for a lifetime of satisfactory service, not only by the Santa Fe Watch Company. but by the Great Illinois Watch Factory. So accurate, Government officials carry them: so pe rfect and beautiful, jewel- ers say they are worth 1-3 to 1-2 more than we ask for them. I will send you one to see W ITHOUT ONE PENNY DOWN— allow you to wear it 30 days FREE— then sell it to you on easy payments. WHY NOT OWN A 21 JEWEL SANTA FE SPECIAL WATCH? You will never miss the few cents a day that will make you own one of these watches—SEND FOR WATCH BOOK— illustrating in beautiful colors hundreds of designs and combinations in cases in the POCKET WATCH, MEN'S STRAP WATCH and LADIES’ WRIST WATCH. You can have your name or mono- gram and any embiem you may desire engraved in the Case to suit your own ideas. Write today for Free Watch Book, and make your selection at once, while this offer lasts. A limited offer! With every Santa Fe Special, beautiful gold chain or strand of exquisite pearis. Write today. Mat! cou ponfor both Watch and Diamond Catalog SANTA FE WATCH COMPANY 66 Thomas ae Topeka, Kans. Home bu the Gr inta Fe Ff Mail 7 SANTA FE WATCH COMPANY 66 Thomas Building, Topeka, Kansas coupon, Please send prepaid and without obligation /> your Watch Book Free explaining your DN to- / Money Down” Offer on th Santa Fe Special Wat day!/.. / Name... / Address. . J City State

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158 POPULAR MECHANICS ADVERTISING SECTION 18 Tools In One “Bh S AWez ok Guaramte S Combination BD) 12 Band Saw Sl" "" Sent to You. on days approval pattern work 12” Band Saw Positively a sensation and at this LOW PRICE you can NOW do the 1001 things you wante «d quick and easy. This 12” BAND SAW has a tilting table, with Miter and stwfrdily built. Ideal for the shop or home. ” *35 S&B Scroll Saw éo5. Here is the outfit of practi- cal usefulness. Will cut wood and light metal true to marks. Table top tilts to 45 degrees, mak- $3.500F- -O.B.Chicago ing it convenient and easy to cut at proper without Motor 7 angle. Thousands of jobs can NOW be ¥,H.P. Motor done by any man or boy with the accuracy croll | aw x . of a real mechanic This S&B Belt Tightener WONDER SCROLL SAW is free —_ 1% 1/4 H. P. Motor-40°-1007% overload Double Shaft Extension from vibration. 18 Tools in One—Greatest Machine You Ever Saw THE S&B 8-in. COMBINATION SAW (18 toolsin one) is the ideal machine for the shop, factory or the home; will rip, cross cut, bevel, miter, mortise, groove, drill, tenon, grind, rabbet buff and polish. Motor is mounted on a base that is a part of the machine proper. Run from any light socket, also provides power for other purposes when the saw is not in use. Complete with attachments and price includes 1-3 H. P. Motor, 60-cycle, 110-Volt A. C. Price $35.00 F. O. B, Chicago. Shipping Weight 100 Ibs (Planer attachment to fit on table top will smooth pieces up to 2 in. wide, $10 extra.) SCOTT-BANSBACH MACHINERY CO. Write for Complete Illustrated Folder— 130 So. Clinton St., Dept. 74, CHICAGO, SLL. Dealers Wanted. $100 eWeek esc Py ENJOY % THRILL’ ELECTRIFIED | iia eee Cy os Oe ~ RADIO at SMALL COST 4 (Automatic Wrapping Paper Printer) 6 85 Automatically prints the merchants’ *‘ADS’’ on his wrapping paper in ofte or twocolors. Costs only what it costs tohave “AD’’ printed on twenty from your light sock- et from that time on. Use same tubes now in your set. No changes needed You'll be amazed at the way Townsends improve your recep- tion and add to distance getting. More than 50,000 now in use. Send coupon today for full infor- mation and free trial offer Made of jet black Ebonite inlaid in s Aladdin and Lamp crest on top. M wand on each side Beautiful to lo« Different from anything you have seen Ladies and gentlemen both send name, address and strip of pape size of your finger. On arrival pay px $1.49 and postage. Cash with Canad we gn orders ORECK’S, 120 So. Wabash Ave. -~ 9! _ ty 1 ry 96 page — is yours for the asking e for your cop Wr SILVER- MARSHALL. “INC., B40W. jackson Blvd.,Chicago, U. S.A. Banish forever all the annoyance | | {imaif'tea'hourss ou toiect and keee yu ard expense of buying new “B commission. We deliver. Every merchant « pros ect Many : ota a TC YSEN -~ 2 ines—one for each paper ra POWER UNIT. Hooked up ina few SALESMANAGER, Dept. A, 1201 Cortland Street, Chicago, Illinois "6 2R UNIT. Hooked up in a few moments—and you have permanent | | ALADDIN GOOD LUCK RING, ENTIRELY NEW pono Chicago, Illinois Townsend Laboratories, Pe FOX Holdsany 713 Townsend St., w e .. OWNSEND screw on tip Bent. 06 e? LABORATORIES, ie te — a ov 713 Townsend St., =—=—T : ‘ Chicago, - ©” pept. 15 Chicago, mm. | | CLIP mail 10c. | - AI ¥ ill. —~_ Please send me full information on the | | ARNOLD FOX, 43-33 42nd Street, Long Islanc City, N. —_ Townsend “*B" Power and Free Trial Offer | Do You Know the Secret = of Quality Reproduction? - OD cic Seeeerccevesconretscecccvecesnneeeboesenmes | os - ity’ . The Secret of Quality’’ tells you simply and cor how to get the most out of your amplifier — how Addreas. .. .cceccs C- A DEVICES WILL SOLVE YOUR BEARING PROBLEMS! new C-A AD JUSTER BOLTS for connecting rod Th aute ankel be ings keep y arings always in perfect tension nently ond t t ". automatically In alle d leas time thes fitt ing ne Ford and Chevrol bearing the Id way and — ention few minutes Just re ve crank-ca Made for mos MON ‘EY Be ae = IF need to “pull” the motor. Now pr YOU AREN 1 "PERFEC rLy ‘SATIS rh Specify low. Install a C-A Automatic Bearin ing ar 1d dismiss make and model of car. Sent dir te ye pur end-pis sy worries. Direct by mail t Complete set for Fords, Chevrolets, ete fies $275 you compl $275 . ADJUSTABLE BEARING COMPANY, Inc. — 405 Virginia Avenue, INDIANAPOLIS, INDIANA

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255-7 N. Oixth otreet, Drookiym, iN. ft. 21 JEWEL~Extra Thin | POPULAR MECHANICS ADVERTISING SECTION 159 STUDEBAKE |

ae work Clarke Jost $1.00. The wat FlorKraftsmen iw ence In easy monthly are doing. You don’t need training—nor ex- this famous Stade. | eh eid perience to make this big money. Others like 8 saving of thirty to fifty percent. you are making it. They acted. It’s your turn Your choice of 80 new ty cases and ls. Latest now. Be a FlorKraftsman — own your own busi- ness—make $25 to $75 per day. It’s easy with the Clarke Vacuum Portable Sander — the

Styles or Jewelry C

: floor sander that does the work of many men lim- ° 500 Watch Chain FREE! "=; DOWN working by hand — and does better work. we are offering a beautiful Watch Chain free. This » al : Rend : offer will be sent to everyone who writes at oncs. Don't delay! ' The only sander with a definite written guar- 3. Get this free chain offer today—while it lasts. antee of erformance GO STUDEBAKER WATCH COMPANY P = nr ic. Directed by the Studebaker Family—known for THINK of the opportunity. No school—no tuition xtra ree-quarters of a century of Jair dealing —no experience necessary. Méillions of dollars are eel Dept. M9e7 South Bend, Indiana spent yearly surfacing new floors—resurfacing old —_ ——ee Cunadian Address Windsor, Ont

ones. Every one wants beautiful floors. Every build- ing in America needs Clarke FlorKraftsmen service— not only once but every few years.

os ewWwa ac mers ra Hand work and big cumbersome machinery is out of q Pp date. Built into the Clarke is the skill and power you : need. It does the work— quality and quantity. You so” . . get the profit. Think of surfacing 800 to 1600 ft. of Smoother and Swifter Than Brushing floors in eight hours—so satiny smooth that you - a j tical ccati f get from 21% to 5 cents a foot for it. Or resurfacing eee. oe One SN "Da ~’ a - a 300 to 800 ft. of old varnish floor a day at from 10 to Complete pare nen cso il i Paint and 15 cents a foot. Think of making school desk tops able es f ass sa | é . . " Ullinois A5 retin ~ 4 ea a Reiataele. aananien like new—120 to 200 a day. Think of renewing the — . hat — iit: ate Unhimited surface on office desks, store counters, etc. The NEW — aan i oie ny en aalnt + mony . Clarke does it all—better, quicker and at less cost. se 1any h 2, . a ° . ; - silver Well designed and builc. Adjustable atomiz- | | Plenty 4 big profit work for you everywhere, just M ing head affords a continuous spray. Useful waiting for you. 7 for spraying ey ae ag th 1%° Many who have seen our previous announcements are _ ~ —as show co ete w i 4 . e heavy duty pump, 8 ft. tubing—New Way | now making big money. The results are certain. | dual top for use on either metal or glass con- It’s a sure pay business. Get the facts—send the - tainers. Glass furnished as standard—$3.45. coupon, And doit now. Aj Type “B"'—less foot pump. For your pump = yr air supply —$2.45. | Ave Type "A" —Attached hand | CLARKE SANDING MACHINE Co. ump. Dualtop. Easy clean {= —_ re ——_ f ass container assures Visioll- —— | Dept. 5, 3831 Cortland St., Chicago, til. any ty ime er and finest TYPE “A” ano For 11 years, Originators and Manufacturers of . hand spray 95. \ Ss. ing | shines. n tip ype “C”’ De Luxe. Complete with large Complete Portable Sanding Machines r. By auxiliary pres- S 95 ° TYPE “©” sure tank and Co moisture trap. med 7 N.Y Requires only an —Saeseeeecesee: | Seeeeeesceene : 95 occasional stroke of pump. A profes- iia ret sional outfit for shops, farms and s ame homes where large surfaces are to be all calls sprayed. No experience necessary to | _ operate Heavy duty 1'%° pump, to pressure gauge on tank, shutoff valve CLARKE SANDING MACHINE co.., Gad 10 ft. hose, New Way dual top anc Dept. 5, 3831 Cortland St., Chicago, Ill. 1 es ane pooner gape vegas ? Gentlemen: Please send me the facts about CLARKE = aa ee oe FLORKRAFTSMANSHIP. No obligation to me. Extra Glass or Metal Tanks with Air Tight Tops for I ey TS te ok “ee Keeping Lacquers and Liquids Handy for Use aan ee ee re a Send 10 cents postage for 3000 word booklet: ‘How To Do Lacquer.” New Wa S ray Gun Com any Peas hc 0 0 00:5 0:0000 4s 00db ei ob Kee CEES 6 tase ddeue y op p | 4 Dept.Q, 5511 EuclidAve., CLEVELAND, OHIO a Po ae en) ees s Headquarters for Lacquer Spraying Equipment. . seene ,

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1 60 Now/ POPULAR MECHANICS ADVERTISING SECTION HOUSEHOLD LACQUERING UNIT YOU CQ CAUSIY GUESS Up JOLLY OWA HUM. SCICEMS. ete 15-foot roll Masking Tape of Paasche with each Unit. Used for clean-cut color edges, shielding and stenciling Brighten Up The Home Until now the home owner had to be content with the old-style slow hand brush, with its unsightly laps and brush marks and uneven coverage Now you can spray lacquers, paints, varnishes, enamels, shellacs and bronzes and make the work easier, look better and finished much faster. Now you can brighten up the home with your choice color schemes. This outfit has been tested and approved for home use and is the latest product of the world’s largest manufacturer It's Amazing Paint Your Own Auto With this unit you can obtain beautiful re- sults, always smooth and uniform—secure any shaae—spray intricate pieces as easily flat surfaces—produce rich blends— veiling effects, and any finish, and as an aid in antiqueing furniture, this unit has no equal. Also don't overlook your auto—now you can keep it bright and new looking. Manual training classes of high schools every- where find this an inexpensive unit and val- uable in teaching this finishing method. as how easy you can now paint with this Outfit of airbrush equipment Now do it better with a Paasche Spray Outfit. UNIT CONSISTS OF Pint Sprayer, Hand Pump, Tank with ind 8 foot Hose Also Finer Outfits for Artists and Larger Power Outfits for Painters Rasch Berbrush b0. . Friant W ° for FREE J. A. PAASCHE, President rite FOLDER 1949 Diversey Pkwy., CHICAGO, ILLS. THIS Patented One Paasche J. D. % Gauge, Fittings Bases cart : Start a Welding & Battery Shop } Lead Burning Outfits $18.00 up Welding Outfits 25.4 I | Soldering Outfits g 0 Lead Burning Torches 6.0 Welding Torches 10.50 up Cutting Torches 50.01 Regulators and Gauges 9.50 Paint Sprayers 14.01 = = Amazing New a) VAAN Pe \"''\\\\" TROUBLE LIGHT! =f GRIP-LITE has magnetized base. Sticks tight to any Ymetallic surface. Ideal Auto ‘‘Trouble Light.’’ Leaves both hands free! Attached in 6 seconds. No batteries to wear out. Gives powerful shielded light. Protected bulb. Also serves as emergency headlight, tail-light, or camping light. “Stick It” Everywhere —Make $50-$100 Weekly Makes sensational demonstration. Sells at sight. Every autoist, arage man, repairman a prospect. Sells for only $3.00. W. iller: ‘Sold 6 in one hour!’’ C. H. Streator: “Selling 90 a week easy!’’ Many others cleaning up. | 10 Da T + 1 Send for sample at special agent’s price of $2 y ria C.0.D. 10 day trial. State make and year of car. Satisfaction guaranteed cr money returned, Order today! MAGNO SALES CO., 6 Beacon St., Dept.17 Boston, Mass. Welding Supplies Superior Oxy-Acetylene Machine Co. P. 0. Box 285 Hamilton, Ohie a 939 Speeds up all measuring nterlox’ 228 MASTER SLIDE RULE a en 8 {t., 20c lineal ft. If not at dealers, sent postpaid. == = MASTER RULE MFG. CO., 813 E. Dealers and Agents: 136th Street, NEW YORK Write for attractive proposition NOW! You Can Do Your Own NICKEL-PLATING “For Plating Nickel, Brass, Cop- Make $150 to $500 a Week per, Silver, Gold, etc. New Scientific Invention Enables Anyone To Nickel-Plate Anywhere with Aladdin Portable Outfit This marvelous Invention enables anyone to NICKEL-PLATI anything—anywhere; in the Home, Garage, Office, Store or Sho} —in fact, you can do all the NICKEL-PLATING on any auto mobile with the ALADDIN ELECTRO PORTABLE OUTFIT See the Nickel Flow Z introductory in a very short time—without removing any of the parts. This i Offer terests every auto owner (and others $q50 | bessuse. you ean SEE THE NICKEL FLOW s3y ono 6 Plater to the job instead of taking the job to the Plater. This offers — wonderful ECONOMY to users and BIG MONEY-MAKING Plus possibilities to AGENTS. Be the first in your locality WRITI Postage FOR FREE BOOKLET. | —AGENTS— P. J. F. BATENBURG Dept. 32 RACINE, WISCONSIN |_WANTED EVERYWHERE

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POPULAR MECHANICS ADVERTISING SECTION 161 SEND FOR THIS BOOK T E Book Teli Here’s Your Chance! The big opportunity you've always wanted— to make extra money, BIG MONEY, in your spare time, at home. W.T. Moore, Twin Falls, Idaho, made a net profit of $1200 in 90 days. You can do it too— turn every spare hour into $4 to $6 profit with the IDEAL LAWN MOWER SHARPENER You, too, can make yourself independent, build a permanent, honorable, big-paying business with this ‘‘Ideal’’ Grinder—a wonderfully simple machine that sharpens all makes of lawp mowers perfectly, scientifically, without taking the mowers apart. Mower slips into Just pick up the mower, set it in the “‘Ideal,"" make a few simple adjustments and sharpener without proceed to sharpen. In 15 minutes the mower is ready for the lawn, and you have § being dismantled made $1.50 to $2.00—depending on the charge you fix. s] A j ~ E it is to make big money with the ‘‘Ideal.” Man, It $s maz ng ow asy Anyone can do it! H.J. Nulick, El Dorado; Kans., turned his grinder business over to his year old son. } grind us: ) ree abet de i _ [2100 Cast Season Hundreds of D il Mo in your locality are waiting |W P. Kendt, Buffalo, u wers to besharpened. Notowntoo | writes I sharpened small. R.8S. Newcomer, Vinton, Ia., writes: ‘People come for miles [ 994 lawn mowers last around and other towns to get their mowers ground.”’ Your cus- | ###0n and the receipts tomers stay with you, too. The “Ideal” sharpens mowers to razor | “ere neatly $2100 edge. Owners are delighted; tell their friends; your business grows } }i t by leaps and bounds. Geo. E. Kearney, Stillwater, You Make Money Right Away Nitin’ writes: We set the a @ machine up 2 weeks ago Friday: since that time have sharpened o* SIGN 102 a 9 That's close to $200 in Kearney's pocket for 2 4 AND MAIL weeks’ work ‘ THIS TODAY This Is Your Chance, Man! Make Us Prove It o* THE FATE-ROOT- Our FREE BOOK, “Let George Say It,” con- HEATH Co. tains proof of what we say. Send today 818-844 Bell St., for it. Plymouth, Ohio, The Fate-Root-Heath Co. o* n .. ai nthe ee teal™ , th Send = 818-844 Bell Street wr your phek Book : Plymouth, Ohio g@ Name ; ee vaon oceseteoes BOOER. 6% c.cee ceaeunnrcee ae cceceseces The International Motor Saw does every sawing job from straight cutting to intricate scroll and design work; crosscuts, rips, miters, bevels, inside and outside jig sawing and scroll cutting. One saw instead of several Write for full description. Dept. S. The International Stamping Co., 400 N. Leavitt St., Chicago, Ill. Cut the Family Barber Bills "King Bugle Best" Band Master R. E. McGeary, 1st Battalion, New York City, after testing all American and foreign made bugles, wrote Scout Headquar- ters that the King Official Boy Scout Bugle was “far and away the best instrumeut of those tested.” The King Bugle has highly polished - brass finish, silver plated mouth- piece. It's the finest bugle made. Get in the Band! Learn to play a band instrument. Start now with a King, the choice of both professionals ne Home Electric and leading amateurs. fit King Band Instruments will help you to learn rE Hair Clipper faster and play better. Our liberal payment : . . terms put these fine instruments within the d op Anyone can trim or bob hair, shorten bangs, reach ofall, Send coupon for literature, prices, lip neck or underarms in a shape almost im- terms, etc. ri to- possible with hand clippers or shears. ¢ )perate s Fits -=£ 1.N.WHITECO.. |. I'l on direct and alternating ~~ _" Will not clog Any 5211-01 Superior Ave., Cleveland, Ohio ! or cut the skin, and cuts as cleanly as a razor. : : + = hy = dc pe ales - ae Light Please send me free copy of ‘‘The White Way” TI 10usands in use. Rigidly guaranteed. . > ? Socket Magazine and your Handy Reference Catalog. TEN DAYS FREE TRIAL (Check, below, instrument preferred.) If your hardware or electrical dealer can’t supply P antng write EE ee eee ee for interesting booklet, or order from this ad. Send no money Ada —pay postman $8.75. Return it in ten daysif not satisfactory. ' is. SP Prrereeeeeeeeeeeee. : seeeereeee eeeee State whether 110, 220 or 32 volt current 1s used. Ge o506ncseseseeceorctere State..ccccccce oe Dealers and Representatives Wanted © : OSaxophone (Trumpet ()Trombone [Alto Belle City Appliance Co., 1022 12th St., Racine, Wis. () French Horn [) Baritone () Bass () Bugle

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162 POPULAR MECHANICS Kills Glare of Bright coe |

tion against the r ght Ww 1 not against the roof ft he car It is ae t all y shaped and placed. Statistics show that thousands have lost their lives auto accidents dn to glaring headlights The Libe rty Glare Shield banist nes th sis danger and m ake dr ving @ safe pleasure. $5.00 AN HOUR TO MEN WHO WILL HELP INTRODUCE IT

Men are needed in every L reality t take care of local business Th: money fr aking poss ar « riwa t e or part “ so the maker they eve ed Seles experien Df ay neces » Libe erty Glare Shield aol our sales instruc they tacliee ters Our workers ar 8 ber rty Glare Shield for their own cars so that they will be at ake +. n a ons. Send for full partioul lars of our sales proposition s and free of Liberty i Company, wos: arr pococin

ADVERTISING SECTION BeYour Own Broadcaster

THE SKY IS THE LIMIT A NEW IDEA FOR A RADIO PARTY! The mystic Home Broadc aster is attac hed to any radio set in a jiffy No skil) required Stretch long extension cord into anc her room or close t, press the switch button on the microphone which sutom radio reception and radio reception comes th yp aster in your pock

more Pp u go to the next sadie

party and see what happ« BE Nb NO MONE Y Pay stman hes a 19 postage for aes a ney ter « lierophone, Special ¢ s cord and a + al ? ples ther you

wand oho ‘Type "v: ‘x. < x Type A. ¢ anteed ELBA PRODUCTS MFG. CO. 726 Atlantic Avenue, B’klyn, N. Y., Dept. 106 ZUSE ENGINITE Bae MOTOR CooLiNG sySTEM Manin Applied through radiator. Gives pleasu motorists. Prevents overheating. Re rust, scale and corrosion scientifically. SA \ GAS AND OIL. ADDS PEP AND LIF! MOTOR. Non-injurious, non-lmflamma is a preservative. Four treatments in on: price $1.00 (West of Rockies 25 cents « Sent C.0O. D. Postage prepaid. Guarant or money refunded. Reg. at U.S. patent Dealers write for proposition Manufactured by INDUSTRIAL REFINING COMPANY 120 West 42nd Street NEW YORK CITY

and economy on Boice-Crane's Universal Jig Saw Sold with or without motor.

It’s Easy to Build Things You can perform every Ya operation with greater speed, accuracy Table 8 in. dia. tilts 45 deg. both ways. Saw-to-frame 10 in. Vertical stroke 1'4 in. Uses blades \% in. to % in. wide. Bronze bearings. Speed 650 R. P.M. Height 14 in. Send 10c for new catalog “ B” describing and illustrating Boice-Crane’s complete line of band saws, jig saws, circular saws, mortisers, jointers, lathes and the Boice Home Workshop. W.B. & J. E. BOICE, Dept. P.M.6-D, Toledo, Ohio

Universal Handisaw Table 15 in. x 17 in. tilts 45 deg. Elevates for grooving Swings 9 in saw te 2% in. stock Insert takes 6 in. x 1 in. dado head, cope he ads and in sand dis 2 in. Jointer attac t sides always

remain parallel to saw re a. se of cleva- tion or tilt of table. No other saw has this feature. Sold with or without motor and base.

Newest Invention=. Eliminates the old fashioned ‘* Always Dull’’ Sickie—No more E xpense ar xd Bother for sharpening anc $ grinding. The Safety Grass Cutter is always sharp—Uses your old

Razor Blades—C uts graas 100% faster. Handle is adjust- y able toany convenient cutting angle. Blades can be n se tly peoinaed Absol::tely safe to leave around the house—f olds up like a jack knife, hid- ing the exposed cutting edge Rates never to get out of order. SEND MONEY. Pay postman $1.00 plus pos tae on delivery. die iba Products Mfg: Co 4 Dept.P.M., 726 Atlantic Ave., ee wy. ae

No work to camping if you take a Zagelmeyer Trailer along. Just raise canvas cover and your dining and sleeping quarters are ready. Folds compactl and instantly for traveling. Carries all luggage All theluxuries of home. Send for FREE catalog. Special low prices for a limited time ZAGELMEYER AUTO CAMP CO. , 2606 S. Henry S!., Bay City, Mich.

Try It “for souenina ARKO SOLDERING TOOL works from any —heats in

¢ St inU G older prepaid in $1.00 Prepaid Anywhere

or rosin core solder. = wary, mechanic is delighted with th ist new time saver. Sent with sample ; ° Pri po -00. Worth the price @e A used. Should be int! tool boxes of ev ery Zadio anc uto owner—connect to any live wire on the Auto or Radio wit Jump Wire- - Fft Long clips furnished. Can be used as a Cigar, Pipe or Cigarette Lighter. Keep it in your car. ARKO MFG. CO., 180 PARKWAY, WINCHESTER, MASS. storage batt stantly—can be used with Kester acid cor

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aS ae See ee a oe ae Le ee ee eee Sle Belle City Appliance Co., 1022 12th St., Racine, Wis. | | 1 (French Horn [ Baritone () Bass Bugle A}

POPULAR MECHANICS ADVERTISING SECTION 163 SALESMEN _ Make a “Clean-Up” Big Profits Roll in! | Over $10,000 a Year Income ;

Our Salesmen-Agents, many of whom have had no previous sales experience, are making a “clean-up” on Dickinson Cord Tires. No e, in years, has met with such phenomenal success. Its astounding pert mance, under severe stress, strain and excessive load both in the ha boratory and on the road has convinced even the most ptical. Big Profits are easily made on the orders that tomatic: lly roll in from business already established in your locality by our National Advertising and ough Consumer Recommendation. Dickinson Cord Tires appeal to the reason and sound idgment of every car owner because they are built long scientific lines by the Dickinson Automatic Tire Building Machine of which we are the exclusive users. The economies they effect, to say nothing of the satis- ction they give, save the Motoring Public millions lollars. ‘hese are the tires that our Salesmen-Agents are find- » a ready sale for. Tires which users, all over the ntry are commenting on as marking a new era in \utomotive Progress. ery Dickinson Tire is Perfect anda Racing Tire. Its bled-cord construction, correct motor-traction prin- ciples, resiliency, quick “get-a-way” and absence of tirelag™ make it a tire for the classes, those who want only the best. Yet it costs no more than the ordinary e; practically pays for itself, as savings in fuel con- imption range from 10°% to 17% ‘hether you have ever sold before or not you can easily make

$40.00 a day selling Dickinson Cord Tires because they render service, deliver Speed, provide Comfort and supply Economy. wien @ ed Customer satisfaction and — sales are assured. Every tire ROFIT ... nteed against all road hazards regardless of mileage. ae | Wy da I > t Excl sive Terr tory ] open. D nt. £0 get : - n < | HYDRO-UNITED TIRE CORPORATION che quality of: Di Tre J: G. FEIST, President a ts 5 VOTTSTOWN, PA CHICAGO, ILL. ‘ a. | Address WNearest Branch I N —_ f ni nm yitraasiy Lf mn r’ TON Mi vant "i “" N D | j L | q mn nN \ ly 7 | i hi ih IN a i hy y py i on mt lim i MN TM Hi ran I eH A uth lf i 1s P I il ct Me a al wo, fre ihhlhini ili bi Ht rl i WH mul | hill sis sith tin snakes epeseapcaliatiimaainesaieadimaidiamlanesdeemeniaiseet |

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i ee ee OO Oe eS UC eee 2 © ee + ee tee, a oes SS Eee =o

164 POPULAR MECHANICS ADVERTISING SECTION

[Charge I oe ig i

14K Solid White Gold engraved case, 183 guaranteed movement, com- ze y plete with silk Princess Pat id Wiistocrat” Sag ‘4, *2s

—hand sanding is made 5 times faster with the TAKE; Sander ‘ombination a > ial

NO c. O. D. TO PAY - the finest, and a full year to pay--Send $1 with order and your choice comes to you prepaid---no C. O. D to pay on arrival. AFULL YEAR TO PAY | Hana engraved 18K solid white

only 3 belt surfac- ing machine. Now making money for thou- sands of carpenters, builders and wood- workers. Quick, easy belt change. Flexible

10 DAYS \ After examination and 10 FREE wd free trial, pay balance in ! TRIAL 2 equal monthly payments. } gold mounting; No inte rest. No extras. All | ywenuine biue- transactions strictly | white dia- confidential. You take | mond, $3.% a no risk—satisfaction ab- | mo, +48°5° 50 solutely guaranteed por money back. >

2 models >, Take-About ee. $85.00 A) Super

pads for curved sur- Take-About 8125.00 faces. Finish unequalled by any machine, due to belt principle. Plug in light sock- et, let the belt work— you merely guide it. Pays for itself. Wrtte for further detatils New catalog ef genuine diamonds ;

* The Porter-Cable Machine Co. gin, Waltham a 1704-10 N. Salina Si., SYRACUSE, N. Y. amtliton Howard, Ili: Sorhhi, f nois watches; fine jewelry. rite for gone copy

Elgin or Waltham move- ment, hand engraved 20 year guaranteed gold filled case 2.12 a month, 326°5° ROYAL 34%". 5 ADDRESS DEPT. 24-F 170 BROADWAY, NY.

=| AGENTS! nce: Geloncs has finally pro- duced it. An instanta- neous metal cleaner— neither elopey weld <r hz DISCOVERY magic floss. Touc 5 to The metal shines bret A BOLISHES ‘ and clean i hard rubbing ight- ning Silver Cloth does same for METAL PO LI - H Silverware, =v!" |No liquid. Lightning Imasine! | Touch tarnished sv =F Polishing Cloth is ap- 5; Flos and you make them === proves by Good House- asnew. Demonstrations posi keeping Institute, stonish! very one asale! A Agents making up to $30 a day! collect real money on ever eovbody, Buys These Pred Makes a Sensational Demonstration! »-* ne eguemizes, bu ntni ver A buy Lightning Peiehing Ploss. Sell to stores and offices in big quantities N else like them ure big, quick MONEY GETTERS Exclusive territory Real coc poration Tri le profit Ar Sample Free! Riciusve territory, Real cooperation. Trp Cons delay. Write NOW! FREE test ane »le and proposition by return mail A. LIGHTNING PRODUCTS CORP. 416 So. Dearborn St, Chicago New Auto Light Sticks on Car Pocket $20 Daily! 4 You can easily make this money act- ing as our locai representative for Stick- A-Lite, greatest night auto trouble light for changing tires or fixing engine. Sticks anywhe re on iron or steel. Spotlight aad tourist camp light, too. Easy for you to sell 5or6aday. Just show it to your friends ar ‘eo pon Ag Hunt made $270 in 9days! School boy sold 35 one afternoon. Get A Stick-A-Lite Write for complete details FREE. Better still, have us send Foe a tomplete Stick-A-Lite Demonstrating Outfit C. O. D or $2.00 Money refunded, less postage if returned within 10 days. Write at once

Information on any book free. Write Popular | Mechanics Press, Chicago, Ll.

T i i i BY N onze INCOME! . © trick at all with this EASY amazingly low price Wood- TERMS worker, which you mayt

and pay for, on terms, to turn idle ho- urs into pro- fit. Does 20 woodworking opera- tions. Ideal size, capacity for shop, home or the job. Economical. COMPLETELY EQUIPPED! Comes complete with 8-in. Cross Cut, 8-in. Rip Saw; 12-in. Band Saw; Jointer, Lathe, Borer, Sander, Guides, Electric Motor. Investigate it!

IPF Working Drawings wsirom co. FE 60 Items You. ott? 1832 Olive St.5 St. Louis, Mo. SEG Can Mabga te’ Without obligation, send me nP details on the Woodworder, and \ ~ J/ Wes he Free Trial and Easy Terms Plan. A Sabena ADDRESS

PREMIER ELECTRIC COMPANY 3870 Ravenswood Ave. Chicago, Il. 1 -_. SEER, = 2s pe ss oes oe es. - SSS

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POPULAR MECHANICS ADVERTISING SECTION 165 — . . a — ) etectric Woodworker Complete Outfit Including Planer, Saw, Lathe and Electric Motor and Many Useful Attachments Planer 3}—> ie Motor oe rn é GCRINDING, 417TTACH- This is a COMPLETE All-Electric Shop. MENTS FAST — ACCURATE — COMPLETE Every kind of woodworking operation It accurate—you can perform every kind of wood- costs a lot less than most other outfits—and for every dollar you pay, you're getting THE BIGGEST VALUE—you can’t beat it, any- where! You can prove every word of this by actually using the Workace Woodworker at working operation, make furniture or other use- ful and decorative things for your own home or for profit. Planing, sawing, turning, drilling, grinding, sanding or bufling—it is all the same to the Workace Woodworker. You can save home or in business. You'll find it fast Amazing low price...... That’s because all the modern up-to- date manufacturing facilities of the J. D. Wallace Company, suppliers of standard woodworking equipment for industrial and commercial uses, are ES utilized to produce the Workace Ss Woodworker. Materials and work- manship are 100°) and the designing 1" articles of the Workace is. strictly professional. Rg" t Woodworking plants, pattern shops, carpen- - a ter and cabinet shops all over the world use 6 ry call. Wallace equipment. It’s the kind of ma- 8° Prod chinery you want—you can't afford to own 6" ( any other. «* o be Become an expert time on every operation, do the work better and and cleaner, too! ......includes everything slotting, turning, crosscutting, ripping—any- thing. Every unit works from the motor. The parts are sturdy and well-fashioned. The regular Wallace UNQUALIFIED GUAR- ANTEE assures replacement of defective Includes aT at thiss | KASY TERMS Circular Saw Get the outfit right away x 36” Lathe ce | SEND TODAY Buffing nw ~ ip | f Wheel Reaney The terms are all in your favor. In fact. this whole advertisement. the merchandise offered Grinder and the easy method of purchasing is new and woodworker There is no end to the number of useful and decorative things you can make with the Workace. Tables, chairs, footstools, screens lamps, lattices, fences, cabinets, doli houses, boekalien, chests—you'll soon become an ex- pert. Woodworking is the greatest hobby a man can have—hundreds turn it to profit too The Workace has Woodworker power strength and capacity to handle quickly and economically any job you'll ever want to do -mitering, tapering, rabbeting, beveling 4” Drill Chuck “4° H. P. G._E. Motor, 110 Volt, A. C., 60 cycle Endless V Belt. two 4" and one 21," V Belt Pul- leys, Cast Iron Sub Base and 10 ft. Cable with separable Plug. all 0 arta can't oo on any by the J. D ompant 4 dams alifornia Ave., Chicago, Ili nthe l b wrong achine Wal- revolutionary A small down payment brings the complete Workace All-Electric Woodworker ready to up and use right The monthly payments are so small you'll scarcely miss them. Many pay for their Workace Shop out of profits from the work it does. So find the set iway can you Work we Investment Get it—use it—you'll Electric Woodworker the best you ever made. Send this coupon now today ind we'll see that you get full details and a complete description right away! J. D. Wallace & Co Adams St. and California Ave., Chicago. Illinois. That Workace Electric Woodworker ire looks good to me I want to know ALL about it, includ- ng your easy terms, right away Name Address SSCS SCE Fees eee ee eeeeeeeS City tats

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166 renlulely FRE F ih the 125-Pleney Seta! Smal Tool” RENCH Circular, a **eteence Ce eseses *erereee aa HERE ame Mail Today to Thi PF-4809 N. patlona Ave. EFLASH SALES ConPN iLL. to fae. 1000 Readers mailing above FREE *: —an ye ANGLE Serowtviver— te tempered crucible Spring steel, it bas 7 J terse! uses—worke > L-t t_. aL others A S. "hase like a smal) pocket knife—more ¢ often useful and valuable. Also FREE—the “$5,000” Circular— giving amazing 125-Picture story of \ Machine Shop- >~ with its 1-TON Power-Gear it Out- gweee a ~ yet eH Vise! * of a tiny Rubbe band hx x ot a + Ral!—the Hardest Le to-bold thing known—against @ 300-Ib. Pull! No, 3—for'all Wire, chain, No. 2—for all Pi spring-making, fence work. ‘*chewed’’ nutsin tight pe -¥ etc, lo. 1—Universal—for ALL ee Nut Wrench, ise and clamp, Spring - making .» etc. EIFEL-ELSSH. PUERENCH KIT t the amaz Sand 3 -CONVERTIOLE in 1. see, You rvice of Nos. OND—inthis New 24-dunce Master Tool Kit for the PRICE Work of ti and Costing $50.00! OF ONE GOOD TOOL; yet, it Does th other tools Weighin 60 pounds HUNDREDS_OF THOUSANDS of men and Women are using ese wonder Kits to make their Homes and Estates more com- fortable— Farms, Shops, etc., more profitable; to get more and better service from A and all jlevices; with an enormous saving in money, time and energy! 6 by the U.8. Army and Navy. Just try — PlieRench Kit once and you would no more go back to other tools than you wou! to the ancke nt Ox-cart With each Kit is a 64-page Manual of Mechanics A GUARANTEED SUPER-QUALITY PRODUCT interested in Permanent income of $75 to $200 Week J. Ky Representative (full or part time mark coupon Mail the Valuable Coupon 7 Better than a Brush Ideal for applying brushing Duco, orany bri oy g lacquer toyour car, furniture, screens, D j ete. Less work, less time; 5s richer finishes. Anyone can aT do it. Change tanks— and et oil springs, spray plants, ete ir | Automatic continuous spray action; oh equal to outfits at three times its price S85 oy LACQUER-WELL SPRAYER 3 = > Challenger Model, complete ‘> Ss 0660 666490.0002060 6006 $3.45 ga Same. less pump, ready to con- he nect with any tire pump....... 2.25 3 Milaster Model, larger _throughout...............+000 4.50 Jame less pump, ready to connect with any tire pump.. 2.75 Spray Gun Model 2.50 Extra tanks with screw tops 25¢ each The Lacquer-Weill Spray Co..,, Dept. R, 2012 E. 105th St., Cleveland, 0 POPULAR MECHANICS ADVERTISING SECTION PROFIT the First 40" That’s What Bill Murphy Made Selling this Sm) . _O. Lerlo-Siphon “It perforates the cap” The fastest selling novelty of the year Others say: “Sold 9 doz. the first day”. “Walked 3 blocks one sold 1 doz”. “Sold 600 order on my first call”. “Sold 3 doz. my first hour out”. So it goes! Everyone Wants This New Gas-Tight Siphon Perfect way to serve ginger ale and all carbonated beverages. Put on without removing crown cap, it perforates cap. No gas is lost. Keeps the contents from going stale and flat. Keeps unused portion full of sparkle for days. Nothing like it. Sells on sight! WRITE! or Mail $1 for Sample You'll want one for your own use anyway. Just send dollar bill with name and address and ask for special offer to agents. Or write for full details. Vaughan Novelty Mfg. Co. Dept. A-935 3215 Carroll Ave., Chicago Dealers! Perfo-Siphon sells on sight from attrac- tive counter display. Write for Qrices. -? Over 3 ft. long; brass bound; powerful lenses. See dist NO objects. Loads of fun! Carrying Case FREE. SEND NO MONEY: Pay Postman only $1.85 and postage (Or send $1.85 and we pay postage Money back guarantee FERRY & CO Dept. 1777 CHICAGO Let us recommend the on best books to study any subject. Popular Mechanics Press, Chicago, Illinois. Electrify Your Shoe Shining Stand We als make complete stands, with power brushes, folding footrests, automatic counter and many Give a better shine in half the time. other features. Time payments if desire: HASTY-JOHNSON, Inc., ELGIN, ILL. ——_ ta ~~ 2»

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POPULAR MECHANICS ADVERTISING SECTION 167 Astounding Successful nated ip, it tents ull of Ground Antenna Gets Winter Reception in Summer! 4p on send ss : . ecial i Clearer GroundWave Reception ° : Allows Greater Distance h P f Hundreds of satisfied users of the sensational Ground Antenna— ; _— cago Read t 1S roo Aer-O-Liminator—are wondering how they ever got along without 5 it. All over the country radio owners are finding marvel us satis- ONLY From 208 Golf Terrace, faction in freedom from static and noise interference. This revo- fl Wilmette, Il lutionary improvement of reception comes from hooking your re- t 85 ceiver to Ground Wave Reception. Radio engineers tel! you that T onan “Your Aer-O-Liminator works the broadcast wave through the ground is in most cases almost 2 pt] fine. You could hardly believe static-free and with rare exception carries no noise interference CD i iL Mu what a difference it makes in the The rapidly increasing a1 my of Aer-O-Liminator owners also liad » distant clearness and tone of my set. It enjoy and appreciate the natural human tone and clarity of this ‘ND NO certainly seems to take out nearly Ground Wave Reception. If you haven't tried it you can't (Or send all the static and power noises that imagine the difference! have been bothering me, too Another advantage users have found with Aer-O-Liminator is CHICAGO Mine is only a three tube set, the surprising D X they get. Distant stations formerly drowned ects but with the Aer-O-Liminator I out by static or noise interference of air waves now come in clear can pick up outside stations every asabell. Selectivity is improved becayse, with pure clear Ground hight, clear and with volume. You Wave Reception, you can pick up and log signals that before were study must be right about the static-free lost in the jumble of shrieks and howls so common in D X reception > . ground waves." through air waves { ress, L. Beauvais You shouldn't deprive yourself of the new thrill of pure, clear ground wave reception a day longer than necessary We let you From Kimberly Radio Corp., prove it for yourself. 328 N. Michigan Ave pagers >| 225 3|FREE TRIAL —_ qrent satisfaction. It removes the necessity th e unsightly « aden her ial 8 and ov Mp = il r tion materially t reduces static and erteide interference. end prodecse very Make this thrilling test at our ear Easy to " = ’ e t ees selectivity greatly Tnetall an Aer-O-Liminato or (Ground Antenna). Leave yor PH ~~ : : We w | it to anyone for the Try out on a night whe u do not get a w and drop Aer-O-! . beet freedom from stati c vity and clear, eweet t into it P. R. Kimberly, President po peacndtg pat ph og mpg Fee hy Fn Piggy ne Sood Eger il for scientific aa n of inator (Ground Antenna), proof of performance » and our iron-bound guarantee, and remarkable Free Trial Offer—Mail Coupon TODAY! 7 A Oo ov, , to _ eV - mina: ) c arcane Mfg. Company 54 E. Erie St. Saag gr 805-H, Chicago. Il. (Ground Antenna) Feapes une ot tee cami Seamer Aer-O-Liminator with details 7 guaral ntes, Seis tific Proof, and Free Trial Offer Passed by the National Board of Fire Underwriters. Meets requirements of the National Electrical Code. — als: Endorsed by Foremost Engineers and Dealers. ; sitesi hes, : : any C Mf C City : “* urtan g. Company Dept. 805-H 154 E.ErieSt. Chicago, IIl. nese

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168 POPULAR MECHANICS ADVERTISING SECTION When the} ro Take advantage of the most amazing offer ever made in all Radio History! Try this remarkabls new Crosley Radio with Crosley new type D Mus cone without cost or obligation. Just phone a Crosley dealer—tell him vou want to test the new Crosley Jewelbox Home is really the place to buy radio! where you can decide leisur urely Crosley dealers authorized to home demonstrate tl new radio Antenna unnecessary for such demonstrations—30 feet of w n the floor of the room will do ie p Put the Jewelbox to any test! Compare it with your old set rry with any other! Learn what rad receptio: rn bee Note how eas will be to break through any surroun ing wall of | il stations—to bring distant programs quickly, clearly in full volume Be sure you test the Jewelbox with the Crosley new typ« D Musicone that you may fully realize, if you own an « } not heard a Crosley, ho srogressed. temember—you do this all in vour own home—at no cost and no oblig tion to you! POPULAR MI HANICS PRESS, s of the air are presented_ THE CROSLEY _ Tre’ teauty of the Jewelbox RADIO CORPORATION PowelCrosley, Jr.,Pres., Cincinnati,Ohio ump The new Crosley Jewelbox is self- tained to operate from light socket. All in one beautiful case. Add and it’s ready to operate! It WITHOUT TUBES erful Supplying 180 volts to ; output tube it gives full undist volume. Other sets supplying | 135 volts result in poor quality tortion and less volume The Acuminators, an exclusive ¢ ley feature, enable you to tune on distant stations increasing strength and volume to a s degree Try it in your home —that’s the only way to buy a Radio! Every Crosley Dealer is now authorized to The new Crosley Jewelbox is up-to-d ° > oy The dial is illuminated—a 1 give you this FREE ty Be ge Ye necessary teature set on ’ let , j . ‘ ‘ rt v pietety shielded as ali hig 1 zg trial! radios should be. The rich br finish high-lighted with gold ma an ornament to grace the fir charm you. The p" ice of the new Jewelbox is a 1 of manufacturing genius! Crosley engineers «dk mned tt ed only Radio Amateur, Exrperi- Crosley Jewelbox under explicit inst tal B Perent tions to make first a perfect radio. I ; w . production of their final design had Wy Col Ve M limited to a few hundred, only. we 1 We pru wWhtty highe persons could have afforded them with efficient Crosley production r ods, facilities to manufacture part NEvr=cownf million quantities and a faith in enormous demand such values w create, this splendid radio receiv« priced at $95 Write Dept. 15 for literature The Musicone finished to match the Jewelbox, $15 PRINTED IN U. S.A

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the new improved UBANTENNA Easily Installed in a Few Minutes — Guaranteed to Bring in Loud, Clear DX Right Through Summer Static Here it is—the new, improved and perfected SU BANTEN NA—even better than its amazingly efficient predecessor which brought forth volumes of en- thusiastic praise from thousands of critical fans. Now it’s ready—the new : SUBANTEN NA—teady to prove its DX ability—ready to challenge any type of loop or up-in-the-air aerial—ready to challenge those who have tried to produce an underground antenna of comparable effi- cieney, but who can’t because the features of the new SUBANTENNA which make it so superior to anything else are patented. In short here’s the ideal antenna. Loud, clear DX regardless of the season- regardless of weather—regardless of how much static there is in the air »>FREE TRIAL!

This Amaz- ing New Un- derground Antenna Works known fact that radio travel through the ground t as they do thru the air ni yvaves, however are learer than air waves, ile Waves are more or t-up with static and other

turbances, while the ground We want you toinstall ietically free of all such the new, improved erference rhe new, im- SUBANTENNA ed Subancenna a real, Insta.lation takes only tifie device completely en- 5 minutes We want se in a amall, compact you to try it on your j and moisture proof can. own set entirely at

our risk! Test it, try it in every way. Com- pare the reception it brings vou, to the re- 1 wav

i y ception you can get a he with any other kind of s great new device antenna If it isn't lf-con g clearer, louder, sweeter . Tac and better in every 4 Tested and Proved Z and better in ever tu 2 A a Tremendously Suc- 2 pe sstul on Every IL COUPON Lit S Clip, fillinand , Type of Set natn No TODAY . notenna was put to count!ess obligation : Cr ts before being orlered to you whatever. We'll send you full ar twas tried out on as many ty pes details of the new improved sig f receivers as it was possible to SUBANTENNA and particu- yr n. In every test the new, lars cf our FREE TRIAI proved Subantenna exceeded - R nd . } 7 4 | previous standards for anten- OFFER and the truly ra -da na performance it is sure to imazing tests we rkonyour set It is certain want you to 4 oO greatly improve your re- make entirely at oe tioa and to so greatly in- our risk Mail st Stina enti hinet by which I can throw fr » good test and ' t : . Name “#9 If . to the Subante » For example, 1 tune in WEAF 1 AY ver a and d any I eo Subantenna and find I have to turndown my volume atat alway oS ae See. . A ihe Sen nath canter ouay bem “OST” Tea spot, and the quality and tone are fs S street... ia I r tot serial I can hear barely a sound, and this i» j . 1 y had bertrer send me me @ same night I stalled the Subantenna Bt « jer t ks Y d . 1 me a a | ts s. its d be re than re arkable some before but ' placed th ov ‘ Neville Seymour, Newark, N. J A.W. 1 re, Md. ft vo CLOVERLEAF MFG. CO.,2714B Canal St., CHICAGO 4c wom som co os ee ee cs el

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PUPVULAR MECHANICS PFRESSs FMINITEMW IN Ve wee mH

< and dont spare the horses/ D.. in and day out, from clubs and liners. hotels and homes.

comes the call for this excellent cigarette. It isn’t that “price doesn’t matter” — but tha! taste matters so much more! copraich 1928 LIGGETT & MYERS TOBACC: CO. JUTSTANDING FAVORITE AMONG HIGHER PRICED CIGARETTES

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