Modern Mechanix, April 1935

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"^ AND INVENTIONS Te 3 IN CANADA 20£ AERO. DRIVE MONORAIL EXPRESS SEE PAGE 85 4 ? Building Stratosphere Air Liners 4 By Allan Lockheed - Noted Plane Designer

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Costly Work Formerly «Sent Out" by Business Men Now Done by Themselves at a Fraction of the Expense This is a call for men everywhere to handle exclusive agency for one of the most unique business inventions of the day. Forty years ago the horse and buggy business was supreme—today almost extinct. Twenty years ago the phonograph industry ran into many millions—today practically a relic. Only a comparatively few foresighted men saw the fortunes ahead in the automobile and the radio. Yet irresistible waves of poe buying swept these men to fortune, and sent the buggy and the phonograph into the discard. So are great successes made by men able to detect the shift in public favor from one industry to another. Now another change is taking place. An old established industry—an integral and important part of the nation’s structure—in which millions of dollars change hands every year—is in thousands of cases being replaced by a truly astonishing, simple inven- tion which does the work better—more reliably—AND AT A COST OFTEN AS LOW AS 2% OF WHAT IS ORDINARILY PAID! It has not required very long for men who have taken over the rights to this valuable invention to do a remarkable business, and show earnings which in these times ate almost unheard of for the average man. A Money-Making Opportunity for Men of Character EXCLUSIVE FRANCHISE FOR l AN INVENTION EXPECTED TO REPLACE A MULTI-MILLION-DOLLAR INDUSTRY EARNINGS One man in California earned over $1,600 per month for three months—close to $5,000 in 90 days' time. Another writes from Delaware—''Since I have been operating (just a little less than a month of actual selling) and not the full day at that, because Ihave been getting organized and had to spend at least half the day in the office; counting what I have sold outright and on trial, I have made just a little in excess of one thousand dollars profit for one month.” A Georgia man made $802.50 his first two weeks. A Connecticut man writes he has made $55.00 in a single day's time. Texas man nets over $300 in less than a week's time. Space does not permit mentioning here more than these few random cases. However, they are sufficient to indi- cate that the worthwhile future in this business is coupled with immediate earnings for the right kind of man. One man with us has already made over a thousand sales on which his earnings ran from $5 to $60 per sale and more. A great deal of this busi- ness was repeat business. Yet he had never done anything like this before coming with us. That is the kind of opportunity this business offers. The fact that this business has attracted to itsuch business men as former bankers, executives of businesses —1men who demand only the highest type of opportunity and income—gives a fairly good picture of the kind of business this is. Our door is open, however, to the young man looking for the right field in which to make his start and develop his future. Not a “‘Gadget’’— Not a '' Knick-Knack"— but a valuable, proved device which has been sold successfully by busi- ness novices as well as seasoned veterans. Make no mistake—this is no novelty—no flimsy creation which the inventor hopes to put on the market, You robably have seen nothing like it yet—perhaps never Treime of the existence of such a device—yet it has already been used by corporations of outstanding prominence—by dealers of great corporations—by their branches—by doc- tors, newspapers, publishers—schools—hospitals, etc., etc., and by thousands of small business men. You don't have to convince a man that he should use an electric bulb to light his office instead of a gas lamp. Nor do you have to sell the same business man the idea that some day he may need something like this invention. The need is already there— the money is usually being spent right at that very moment and the desirability of saving the greatest pare of this expense is obvious immediately. Some of the Savings You Can Show You walk into an office and put down before your prospect 2 letter from a sales organization showing that they did work in their own office for $11 which formerly could have cost. them over $200. A building supply corporation pays. our man $70, whereas the bill could have been for $1,600! An automobile dealer pays our representative $15, whereas the expense could have been over $1,000, A department store has expense of $88.60, possible cost if done outside the business being well over $2,000. And so on. We could not possibly list all cases here. These are just a few of the many actual cases which we place in your hands to work with. Practically every line of business and every section of the country is represented by these field reports which hammer across dazzling, convincing moncy-saving i eto which hardly any business man can fail to lerstand, Profits Typical of the Young, Growing Industry Going into this business is not like selling something offered in every grocery, drug or department store. For instance, when you take a $7.50 order, as much as $5.83 may be your share. On $1,500 worth of business, your share may be $1,167.00. The very least you get as your part of every dollar's worth of business you do is 67 cents —on ten dollar's worth $6.70, on a hundred dollars" worth $67.00—in other words two thirds of every order you get is yours. Not only on the first order—but on repeat orders —and you have the opportunity of earning an even larger percentage. This Business Has Nothing to Do With House to House Canvassing Nor do you have to know anything about high-pressure selling. "Selling" is unnecessary in the ordinary sense of the word. Instead of hammering away at the customer and trying to "force" a sale, you make a dignified, business-like call, leave the installation—whatever size the customer says he will accept—at our risk, let the customer sell himself after the device is in and working. This does away with the need for pressure on the cus- tomer—it eliminates the handicap of trying to get the moncy before the customer has really convinced himself 100%. You simply tell what you offer, showing proof of success in that customer's particular line of business. Then leave the invention without a dollar down. It starts working at once. In a few short days, the installa- tion has actually produced enough cash money to pay for the deal, with profits above the investment coming in at the same time. You then call back, collect your money. Nothing is so convincing as our offer to let results speak for themselves without risk to the customer! While others fail to get even a hearing, our men are making sales running into the hundreds. They have received the atten- tion of the largest firms in the country, and sold to the smallest businesses by the thousands, No Money Need Be Risked in trying this business out. You can measure the possi- bilities and not be out a dollar. If you are looking for a business that is not overcrowded—a business that is just coming into its own—on the upgrade, instead of the downgradc—a business that offers the buyer relief from a burdensome, but unavoidable expense—a business that has a prospect practically in every office, store, or factory into which you can set foot—regardless of size—shat ir a necessity but does not have any price cutting to contend with as other necessities do—that because you control the sales in exclusive territory is your own business— that pays more on some individual sales than many men make dn a week and sometimes in a month's time—if such a business looks as if it is worth investigating, get ix touch with us at once for the rights in your territory—don't delay— because the chances are that if you do wait, someone else will have written to us in the meantime—and if it turns out that you were the better man—we'd both be sorry. So for convenience, use the coupon below—but send it nghe away—or wire if you wish. But do it: now. Address F. E. ARMSTRONG, President Dept. 4019-D, Mobile, Ala, TRUS FOR EXCLUSIVE — . I TERRITORY PROPOSITION ! | F. E. ARMSTRONG, Pres., Dept-4018-D Mobile, Ala. I Without obligation to me, send me full infor- I mation on your proposition. I i Name... - || Street or Route. | Box No.. | l City E I State ne ee eee |

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masas A TIP GOT BILL A GOOD JOB! MY RAISE DIDN'T COME THROUGH ' ER a ST MARY -1 MIGHT AS WELL GIVE UP. Ba TOM GREEN WENT . COUPON GAVE ME A QUICK (T. ALL LOOKS SO HOPELESS, ~ INTO RADIO AND HE'S START To SUCCESS IN RADIO, : MAIL THIS ONE TONIGHT IT ISN'T HOPELESS EITHER . BILL. WHY DON'T -YOU TRY A NEW FIELD LIKE RADIO! 5:9 MAKING GOOD MONEY, vd) TOO. VLL SEE HIM > RIGHT AWAY, TOM'S RIGHT - AN UNTRAINED MAN HASN'T A CHANCE. I'M GOING TO TRAIN FOR RADIO TOO. IT'S TODAY'S FIELD OF GOOD PAY OPPORTUNITIES UNES [YOU SURE KNOW 7 TRAINING FOR RADIO IS EASY AND I'M RADIO- MY SET Koh VE, GETTING ALONG FAST-- NEVER SOUNDED m GET & JOB SERVICING SETS. BETTER IN SPARE TIME UD sp ; up AKE THERE'S NO END TO THE "A sp GOOD JOBS FOR THE S; TRAINED RADIO MAN N.R.I. TRAINING. CERTAINLY PAYS. OUR MONEY WORRIES ARE OVER AND WE'VE A BRIGHT FUTURE AHEAD IN RADIO. OH BILE, ITS WONDERFUL YOUVE GONE AHEAD SO FAST IN RADIO. YN 4 ILL TRAIN YOU AT HOM In Your Spare Time For A GOOD RADIO JOB Mail the coupon now. Get the facts about Radlo—the field with a future. N. R. I. training fits you for jobs in connection with the manufacture, sale and operation of Radio equipment. It fits you to go in business for yourself, service sets, operate on board ships, in broadeasting, television, aviation, pollee Radio and many other jobs. My FREE book tells how you quickly learn at home in spare time to be a Radio Expert. Many Radio Experts Make $40, $60, $75 a Week Why struggle along in a dull job with low pay and no future? Xj Start training now for the live-wire Radio fleld. I have doubled t and tripled salaries. Hundreds of successful men now in Radio H E R E 5 S P R [1] 0 F t h a got their start through N. R. I. training, P M Make $5, $10, $15 a Week Ext my tra ining pays ana Spare Tina Wl» eeek Er i Hold your job. 1’ll not only train you in a few hours of your = " spare time 2 week, but the day you enroll I start sending you J. E. SMITH, President Extra Money Job Sheets which quickly show. you now to do Radio Nationel Radio Institute repalr jobs common in most every neighborhood. I give you Radio Equipment for conducting experiments and making testa Zhe man whe bas Atrasta the that teach you to build and service practically every type of receiv- men for A Radio Industry ing set made, Cleo T. Retter. 30 W. Beechwood Arve., Dayton, than anyother man in America. Ohio, wrote: “Working only in spare time, I made about $1,500 while taking the Course.'" Now Owns Own Business Find Out What Radio Offers. Mail Coupon “If I had not taken Sunre Tiie 1 Earn My book has shown hundreds of fellows how io make more your Course J would be money and win success. It’s FREE to any ambitlous fellow over digging ditches instead “I have no trouble 15 years of are. Investigate. Find out what Radio offers you. of running my own busi- getting Radio work. Read what my Employment Department does to help you get into ness. One week I made I have the reputation Radio after graduation, about my Money Back Agreement, and $75 on repairing alone, of being the best Ra- the many other N, R. I. features. Mail the coupon in an envelope, and inis doen t count dio man 2 E or paste it on a 1c. posteord TODAY. sales. & fellow wants average $15 J. E. SMITH, President, Dept. SDH be) | adio, N. R. week for sparo time DE. A s President, ept. wW a 3/1 V./ p Eri Starting point." only.” G. Bernard Natlonal Radio Institute, Washington, D. C. NOR eH 17) R. S. Lewls, Modern Crey, 151 Washington p PE a eeu munmummuamumECEEEEERMENMEREEEMEN Radio Service, Pitts- St., Bronson, Michl- field, Ili. gan, 1! J. E. SMITH, President, Dept. 5DH H National Radio Institute, Washington, D. C. Dear Mr. Smith: Without obligating me, send your book which points out the spare time and full time job opportunities in Ttadio and your 50-50 method of training men at home in spare time to become Radio Experts. . (Please print plainly) 24 Owes His Success to Radio Training “Since 1929 I have earned my living in Radio. I owe my last three jobs to N. R. I. I am now in the main control room of one of the large broadcasting chains," Serge A. De Somov, 1516 Library Ave., New York Cily. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 3

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«YO? o man «ood finie, FOR THE EXPERT HARMON ICA PLAYER € Always in demand for TM parties, outings and social meetings of every kind are '$ the boys and girls who are goodharmonica players. They are the leaders who get the fun ee that makes the affair “peppy”. ‘2 They are the ones who form the 7 Harmonica Bandsthat play atschool functions, at community meetings, at Scout rallys. And then once or So Simple to Learn Without costing you a cent you can learn to play the Harmonica like a professional in a short time, Mail the coupon below for free Illustrated In- struction Book, "The Art of Playing the Harmonica.” You don't have to know one note from another. This book tells and shows you just what to do. Just follow the simple instructions and in a short time you'll be amazing your friends with the way you can perform. Be Sure of Your Harmonica The Harmonica is a real musical in- strument, delicately tuned and beauti- fully made. Don’t waste your money on an inferior, poorly made instrument. With a Hohner you know you have the best that can be obtained, the Har- monica that for seventy-five years has been the choice of professional players for their stage and radio work. LOOK FOR THE HOHNER NAME ON THE HARMONICA. IF IT'S NOT THERE—IT'S NOT A HOHNER. ACCEPT NO SUBSTITUTE. < Send for FREE Instruction Book to See How Easy It Is to Play

Al Parties and Dances . «+ gay good times

The Harmonica Band makes a big hit Frequent supertunites play on the radio HOHNER im. E 351 Fourth Ave., N M Harmonica.”

Pu i Se NO eer a a E HOHNER, INC., Dept. 973-D, - Y. City. @ Please send me without cost your free instruction book '"The Art of Playing the twicea year comes the big Harmonica Band Contest when bands from different schools and communities compete for the trophies and honors All this is open to the boy and girl who learns to play the Har- monica. Wehave helped hundreds of thousands of boys and girls to learn to play this simple and delight- ful instrument. that are offered. Let us help you. HOHNER IS ON THE AIR: Listen to Carl Freed and hls Harmonica Harlequins every Saiurday evening on the following stations: WOR New York at 7:45 P. M.—E. S. T. WXYZ Detroit at 7:45 P. M.—E. S. T. WLW Cincinnati at 7:15 P. M.—E. S. T. WGN Chicago at 6:45 P. M.—C. S. T. You'll enjoy listening to this superb Harmonica Band

We want every boy and girl to know how quickly and easily they can learn to play a Hohner Harmonica. So we would like to send you, absolutely free and without any obligation to you, our complete Instruction Book, “The Art of Playing the Harmonica.” Just fill in and mail the coupon, and it will be sent you at once. M. HOHNER, Inc., 351 Fourth Ave., New York City

OS EEE eee o wn wd" Please address Canadian tnguirles to Hough and Kohler, Ltd., 466 King St. West, Toronlo, Canada 4 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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PRICE 15 CENTS 7 Z S (20 CENTS IN CANADA) 7 g " IN. cope APRIL 6 Volume XIII 1935 T S Number 6 yo LLLI ERI Gite Build a Midget Racer SPECIAL FEATURES Building Stratosphere Air-Liners - - 32 By Allan Lockheed Knock Down Monuments With Feathers 35 Nic Sprank in Oddities of Science . e Built as a scale model of the famous Miller American Railroads Challenge Speed Dirt Track Special, the midget racer de- Records " M E - R 38 scribed in this issue will attain a speed of 20 miles per hour. FOR BUILDING PLANS AND IN- . . STRUCTIONS, SEE PAGE 94. Racing Time for News Scoops - - - 42 By Robert L. Frey SHORTER FEATURES How I Judge Championship Fights - - 48 P tic Tub h By General J. V. Clinnin "Meals "ad ne ot E - At Three-Mile Bridge Spans Get Cash for Puzzle Solutions; Furniture E enn ds bi " "oc 47 Contest Winners Get $125.00 - - 54 Ocan pen aad NN 53 Paragraph Oddities of Science 62 Electrical City Built Without Chimneys 58 Deer Race On Steeplechase i A ; Course In New Sport - - 63 By Grace Kirkpatrick 50-Year Fire Endangers Town = = =- = = 72 How to Stain Your Microscope Slides - 61 Following the Birds On By Julian D. Corrington, Ph. D. Their Migratory Trek - - 77 * Aero-Car to Cross U. S. In 12 Hours - - - - 85 Clipping Dollars from Auto Running Expenses - - - - - + = 64 HOW-TO-BUILD FEATURES By Maxwell Reid Grant Hear All-Wave Programs With 3-Tube Tool Box Science Builds the Modern Home - >- 68 Portable - - =- - - 90 By P. M. Ohlinger By Paul D. Paddock Build Midget Miller—A Model Dirt Track Racer - 94 Identifying the Fish You Catch- - - 74 By Weston Farmer i Boy-Power Steam Shovel By Robert Page Lincoln Moves Miniature Mountains 100 By Ralph T. Moore ing Life-Like Fi f Unfolding the Mysteries of ood . E mus el ds: - 82 Boat Plans - - - -106 . By Sam S. Rabl By Harold. L. Zimmer (Continued on page 6)

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p m we at aas LE LEE LL DRDERS LOCTLOUE BUDDHIST CHARMS An Ozlstone would have sold for its weight in gold A ago, Empress Shotoku tried to drive the evil spirits out of Japan. She ordered wood catvers to engrave enough wooden blocks to print 1,000,000 charms. Each block contained 74 intricate characters. How many blocks were ruined by eva spirits in dull knives history does not say. The ożłstone quarries of Norton-Pike were first used 1044 years later, Electric furnace oz/- stones were first known in the latter part of the 19th century. Modern industry uses them to take the evil spirits out of cutting tools. For hand-work and machine work, steel edges are made keener, harder and longer- lasting by oilstoning. Go to yout hardware store and see the various Norton-Pike oilstones, fast-cutting, medium and extra hard. The expert's skilful technique of sharpening blades, bits, augers, drills, etc., is clearly des- cribed and pictured in our free bookler, “How to Sharpen”. Send for it today—before you forget! Established 1823 spy PIKE Products BEHR- MANNING CORP., U. S, Sales Representatives Dept. K, Troy, N. Y. Send me free, Norton Pike Book, "How to Sharpen.” Nami REESE RCM ee ae eee meee moe eee eee eee ee ot m m onl CONTENTS—Continued from page 5 NEW MECHANICAL INVENTIONS Machine Studies Brain Action - - - - 36 Tiny Gauge Tests Compression- - - - 36 Instrument Measures Heat of Sun Rays- - 37 Outlet Plug Pierces Through Rug - - - 37 Tubes Replace Strings In Piano - - - 37 Defense Gun Hurls Balls of Fire - - - 40 Vanes On Racer Deflect Rushing Air Currents 46 Big Siren Throws Sound 10 Miles - - - 46 Ribbed Bolts Replace Hot Rivets - - - 46 New Tubes Change D. C to A.C. - - - 48 Light Beams Produce 1,800 Organ Tones- - 50 Alarm Rings As Gas Gets Deadly - - - 50 Adjustable Club Makes Caddies Unnecessary 51 Body Weight Raises Bike Speed - - 51 Wing Valleys Stabilize Air Ride - - - 51 New Talkie Machine Makes Home Sound Movies Possible - - - 52 Umbrella Goes Modern With “Safety” Window - - - - 56 Harness Prevents Running Escape - - - 56 Clock Hands Show Valve Position - - 56 Turntable Featured by Rotary Gas Station 60 Builds Light Diesel Plane Motor - - - 60 Shower Coupling Fits Any Faucet - - 60 Top Wing Slot to Eliminate Plane Stalling 62 Phone Poles Can Be Erected By One Man 66 Frequency Waves Aid to Hearing - - - 66 Revolving Mast Sets Sail Automatically - - - 61 Traveling Bag Yells At Thieves- - - 67 Combine Phone and Mike - - 67 Projector Illustrates Behind Speaker’s Back 71 Baby Bounces In Safety Chair - - - 71 Wire Web Controls Alarm Bell- - - - 73 Build One Thousand Ton Press- - ~- - 73 Toy Train Delivers Rural Mail- - - - 78 Folding Bed Sides Guard Baby - - - - 78 Ash Tray Protects Cigarette - - - -~ 78 Largest Plane Carries Printing Press - - 79 Air Silencer Tames Diesel Roar - - 79 Design New Bicycle Speedometer - - ~- 79 Fins Utilize Wave Motion to Propel Boat - 80 Metal Mask Gives Vapor Facials - - - 80 Bottles Make Attractive Lamps - - - 80 Dirigible Mast Eliminates Mooring Problem 84 Invisible Wires Heat Garments - - - - 84 Electric Eye Trains Voices for Chorus - - 86 Rim Prevents Blow-Out Accidents - - - 86 Steel Plate Guards Holdup Victims - - - 87 Machine Takes Casein from Milk - - - 87 Ball Aids In Cleaning Dust Mop - - 81 Professor Conducts Class With Two-Way Radio - - 88 Rubber Telephone Cord Stretches - -= 88 DEPARTMENTS Solving Reader's Problems - - 16 Random Chips from the Editor's Workbench 20 Electric Plate Lightens Housewife's Labors 57 Sportsmen’s Campfire - - - -~ - - 14 Needed Inventions - = = = = = 81 Radio Sparks - - - - - - - - 89 With the Collectors - - - ~- -1M Business Converts Ideas Into Profits - - 154 (Continued on page 8) Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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Prace: An American industrial plant. CHARACTERS: (1) President of the Company. (2) An employee of the Company. PRESIDENT: What are you doing here at this hour of night? No one has authorized overtime. EMPLOYEE: I’m working on my own time, sir. There's a tough job coming up tomorrow and I want to be ready to handle it. I hope you don’t mind, Iv THIS SCENE HAD HAPPENED IN YOUR PLANT, Mm. PnEsI- DENT, WOULD YOU EVER FORGET THAT MAN? Listen: This very night, at 10:30 p. m. and later, that man (multiplied by many thousands) will be working on his own time so he may do a better job for his employer tomorrow. Of course he expects to benefit ultimately because of it—isn't this the fundamental principle of individual progress in American industry? But the point is, he is making an investment in himself that must pay dividends to his employers before there is any change in his own pay envelope. There you have the philosophy of the average student of the International Correspondence Schools. The I, C. S. student believes the best way to get a better job is to do his present job better, And ambitious men who accept this theory of personal progress are invited to consider the coupon below, mark the subject of their chosen careers and to mail it today. INTERNATIONAL CORRESPONDENCE SCHOOLS ~ “The Universal University” BOX 2317-C, SCRANTON, PENNA. Without cost or obligation, please send me a copy of your booklet, “Who Wins and Why,” and full particulars about the subject before which I have marked X: O Architect O Architectural Draftsman O Building Estimating O Wood Millworking Contractor and Builder O Reading Shop Blueprints O Telegraph Engineer O Telephone Work C Mechanical Engineer O Mechanical Draftsman LI Machinist [O Toolmaker O Patternmaker Ci Heat Treatment of Metals O Bridge Engineer O Bridge and Building Foreman O Development and Protege tion of New Products O Electrical Engineer Electric Lighting O Welding, Electric and Gas O Aviation Engines UI Business Management O Office Management O Industrial Management O Traffic Management O Accountancy O Cost Accountant Oc. P. Accountant O Bookkeeping . O Secretarial Work D Spanish O French DO Salesmanship O Advertising Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers O Gas Engines DO Diesel Engines O R. R. Bridge and Building TECHNICAL AND INDUSTRIAL COURSES O Automobile Mechanic O Plumbing Q Steam Fitting O Heating O Ventilation Chemistry QO Pharmacy O Sheet Metal Worker O Coal Mining Engineer | O Steam Engineer [] Civil Engineer O Navigation L] Air Conditioning O Steam Electric Engineer Boilermaker Surveying and Mapping O Textile Overseer or Supt. O Refrigeration O Cotton Manufacturing D R. R. Locomotives O Woolen Manufacturing O R. R. Section Foreman O Agriculture © Fruit Growing O Poultry Farming Lj Radio L] Marine Engineer O Air Brakes [] R. R: Signalman Li Highway Engineering Foreman BUSINESS TRAINING COURSES O Service Station Salesmanship O First Year College Business Correspondence O Lettering Show Cards O Signs D Stenography and Typing O Civil Service — [] Mail Carrier D Railway Mail Clerk O Grade School Subjects O High School Subjects O College Preparatory O Illustrating O Cartooning

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Ms A A l a uquio cu i IN the strict sense of the word, a can of LePage's Glue is not a tool; but when a craftsman writes: "It's the handiest tool in my workshop," it must be part of the tool kit. Yes, it must be important because the craftsman or hobbyist who has spentmoney forlumber in making a project isn't taking any chances on 2 questionable glue. He wants strength and usually a slow setting glue to adjust joints. Helikes to complete his work without unnecessary stops such as" messing" around with glue pots. That's why theamateur as wellas the top-notcher prefers the ready-to-use LePage's. Keep itin mind nexttime you visit your hardwate store. RUSSIA CEMENT CO. Laboratory and Factory $ Gloucester, Mass. broadcasting, aviation and ENG I N EER I NG 9 police radio, servicing, marine radio telegraphy aud telephony, Morse telegraphy and rail- way accounting taught thoroughly. Engineering course of nine months’ duration equivalent to three years of college radio work. School est. 1874. All expenses low. Catalog free. DODGE'S INSTITUTE Fern St. Valparaiso, Indiana TUTE v Are the Type of Pilots and Mechanics Demanded in AVIATION Lineoln-irained men enjoy the advantage of knowing that the aviation industry quickly recog- nizes thelr ability. Our employment department lists many graduates who have obtained good jobs among prominent concerns in aviation. Good Pay Jobs This Government Approved School Is constantly in touch with the aviation industry with a view to placing its graduates in trusted positions. Future bright for those who No guess-work about your getting proper train- ing at LINCOLN. Only modern, high class training planes with Department of Commerce approval are used. Training given for Govern- ment license as Transport, Limited Commercial, Private or Amateur Pilot. Ground and mechanies school with experienced instructors qualify you as Master Airplane and Engine Mechanic. 24 start now. Write years’ experience as successful mechanics trade today! State your school; 14 years’ successfully teaching aviation. age. LINCOLN AIRPLANE & FLYING SCHOOL 406D Aircraft Bidg. Lincoln, Nebr. CONTENTS—Continued from page 6 INTERESTING SCIENTIFIC ITEMS Device Measures Musical Talent - - - 36 School Built to Please Children - - - 52 Eye Makes Body's Only Vitamin - - - 52 Rail Car Runs On Rubber Tires - - - 50 Plane Drops Machinery In Chutes - - - 50 600-Passenger Planes to Use Huge Airports 40 Bombard Nitrogen to Get Oxygen - - - 40 Campbell to Attempt Record Run - ~- - 56 Safe Explosive Resists Flame - - - - 60 Marconi Predicts Talks to Mars - - - 66 Venom Cures Bleeding Patients - - - 67 Pole Affects Radio Wave Speed - - - - 71 Instrument Solves Math Problems - - ~ 71 Fake Cats Scare Pests to Save Crops - - 73 Paste Removes Old House Paint - - - 73 Duelists Shoot Selves In Target Practice - 78 Tiny Model Sloop Sails 25 Miles - - ~ 84 German Engine Uses "Bullet" Lines ~ - 86 Actor Plays Underwater Symphony - - - 87 Student Makes Home In Trailer - - - 88 First Class Mail to Go By Air - - = - 88 FOR THE WORKSHOP FAN Connect Speaker to Radio With One Wire - 89 Make Insulators from Old Tires- ~- - - 89 Jog Bends Sheet Metal Accurately ~ =~ - 89 Tennis Rules Apply to Indoor Dart Game - 93 How to Sell Your Shop Products - ~- - 96 Auto Generator Kinks - - - - - ~- 9f Mould Plaster Novelties With Gelatin -. - 98 Radiator Cap Is Flying Goose - - ~ - 99 Midget Mechanical Man Moves Head - - 99 Seasonal Home Suggestions - - 102 Make Auto Repairs With Plastic Rubber - 103 Racks In Closet Increase Storage Space - - 104 Fit Window Seat Between Closets - - - 104 Magnifying Camera Takes Insect Photos - 105 Handy Uses for Shop Tools- - - - -~ 110 Weave An Old Chihuahua Chair - ~- - 111 Gas Bolometer Detects Heat of Candle - - 112 Simple Motoring Kinks - - - - -113 Published monthly by Modern Mechanix Publishing Co., at Broadway and Ilth St., Louisville, Ky., U. S. A. Entered as second-class matter under the act of March 3, 1879 at the post office in Louis- vile, Ky. Copyright 1935. Advertising offices: New York: 1501 Broadway. Chleago: 360 North Michigan Ave. Editorial offices: 529 So. Seventh St., Minneapolis, Minnesota. Not responsible for un- solicited manuscripts. Contributions accompanied by insufficient post- age will not be returned. In U. S. and Possessions, 15 cents a copy; $1.50 a year. In Canada, 20 cents a copy: $2.25 a year. Other Postal Unions, $2.00 a year. Printed in U. S. A William J. Kostka Robert Page Lincoln Editor Hunting and Fishing A. Neely Halt Editor Workshop Expert S. S. Rabt Naval Architect 8 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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BIG PAY JOBS zy ELECTRICITY 12 WEEKS TRAINING AT; COYNE WILL QUALIFY YOU | Fit yourself for a permanent job, with good pay and a real future, Better times are opening wide the door to a brilliant | new Electrical Age offering the greatest opportunities in |: history for_electrically-trained men. 12 weeks training in the Great Coyne Shops will qualify you. My practical shop methods make it amazingly easy to learn — no books, no correspondence, but real electrical work on real elece trical machinery! STUDENTS BUSY AT WORK IN GREAT COYNE SHOPS Pil Finance Your Training I mean exactly what I say. You can get a complete training by the world’s oldest and largest Practical Electrical School and I'll finance your Tuition. You won't have to start paying me back in small, monthly payments until 2 months after your required training period is over. I consider the fellow | „who is ambitious enough to want to get ahead by taking my i e È "Training, worthy of my help. MAIL THE COUPON BELOW and oe” you can prove to me that you are willing to spend just THREE MONTHS in the Coyne Training Shops Learning ELECTRICITY. Then, Til tell you how I finance your Tuition — give you your complete Training and let you pay me back later. AMAZINGLY EASY WAY TO LEARN i - tures, operating real motore, dyna- Losk of d pacha ne. hid mos and generators, wiring houses, GET THE FACTS advanced e io M ete. That’s a glimpse of how we Coyne is your one greatest chance one. Idon’t care if you don’t belp to make you a master electri- to get into electricity. Every ob- know an armature from an potere Began for jobs gtacle isremoved, Thissehool is 38 air brake—I don’t expect you . yearsold—Coynetrainingis tes tol It makes no difference! Jobs-Pay -Future =—proven beyond all doubt —en- @orsed by any largo electrical á concerns. You can findoutevery- Don't let lack of puey Z Stop “Two weeks after graduation J ree thing absolately free. Simply mail pu Moatorhamena oyne ceived asplendid job. Themaineon. the coupon and let me gend you aveno more money than sideration given my application wag the big, aes Coyne book of 1 that I was a Coyne Trained man,” b! hs... facta. . . jobs you have. That's why Ihave ind rte d dre) nan, ote e e T E a worked out my offers. Ẹpo! ro! Soucy of llünohs, 4 *‘T wish to thank your Employment ‘Tells you how many earn expenses anager for securing this position While training and how we assist MANY EARN While forme,” wrote Albert Tagon “he Our graduates in the field. ‘This sent me out to this Company the does not obligate you. So acta Bf yon need part-time work to belg pay your living expenses and will te! first day and I wasemployed there Once. Just mail coupon, Es your problems 1 may be able to immediately.” And I could go on elp you as I have thousands of oth- quoting from hundreds of letters of &uecesaful Coyne Trained Men, What Get This they havedone, youshouldbeable FREE to dot ero. "Thon, in 32 brief weeks, in the Electric Refrigeration greatroarings opao Coyne, I trai INVENTO! Rightnow I'mincludin bi u ver dreamed you could i n gmy big new oues you never dreamed you conid MAINTENANCE ENGINEER Eleetrie Refrigeration course at no Book SERVICE STATION OWNER RADIO EXPERT extra cost. est outlays of electrical apparatus ever assembled .. . real dynamos, engines, power plants, auto, awitch= boards, transmitting stations ... everythin from doorbells to farm power ang lighting. . . full-sized PER GERD T CREE? GRIP D Gan a GERD RR. Our 4 H O. LEWIS, President Now In Our |, | Coyne Electrical School, Dept. 45-53 This ls onrnew fre. 8 500 S. Paulina St., Chicago, Hl. +++ in full operation every day? proof modern home B Dear Mr. Lewis:— Without obligation send me TR AINING wherein is installed [| your big free catalog and all details of Free Em- thousendeof dollaro: i ployment Service and zont Pd Ee Re- geration course, also tell me all about your By Actual Work Eia “Every com- fj "Pay After Graduation Offer.” fortandconvenlence No dull books, no baffling charts,no classes, you get individual training bx all real actual work with only e theory you will need. Building tealbatterics... wipdingrealarma- COYNE SA scuost has beenerrangedto | make you happy and contented during your training, FOUNDED 1899 [| Nm. e eoososososeescessesosvosesooseocecvenso i Address ,« «eee eee eere esee ee eroe ee eo oe roeoo | Cit. crerverevervesererceceree -: 7.77 ERES Thank You for Mentioning Modern Mechaniz and Inventions for April When Writing to Advertisers 9

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1935 MODEL ATLAS “UNIT PLAN” Metal-working Lathe—designed so units may be added 1 Tlere’s a lathe that meets every . need economically. As your shop grows, you can add to it UNIT by UNIT until you have a fully equipped, back-geared, serew-cutting lathe, capable of every kind of lathe work—as fine a tool as a man could wish for. This first step has a precision- ground bed of heavy-ribbed cast iron; hollow headstock spindle; tailstock; compound rest; driving belts and pulleys, etc. Takes 24 in. work between centers and bas 10 in. swing. $5475 ASRS 2 By adding countershaft assembly you get greatly increased "* power and wider speed selection ($49.25). Ideel for all é small metal jobs and work on radio, arma- tures, valves, pistons, ete. The next step ($54.75) substitutes different Compound Rest and adds the Carriage and Rack. This gives longitudinal feed entire length of bed without changing the Rest. $8750 A & Be 3 Final additions build up, UNIT by UNIT, to this complete a back-geared, screw-cutting lathe. Cuts 4 to 72 threads per inch; automatic reversible feeds; 16 speeds from 28 to 2,072 R.P.M. The ATLAS does WELL any job within its size capacity, with highest degree of accuracy and an abundance of power. Sold on 2 weeks’ trial, with money-back guarantee, Full line of attach- ments at new low prices, ATLAS DRILL ATLAS PRESS COMPANY 1852 N. Pitcher Street, Kalamazoo, Michigan FREE CATALOG Send your new FREE catalog of ATLAS metal lathes, wood lathes, drill presses, attachments, arbor presses, Name eee eee ee ee ee re ee es aus 954 POLI ———— . t] $33.45 CS cn cse moet ay ..State Lees. RADIO’S LEADING CATALOG Send for the new 1985 ALLIED Catalog—a great book devoted ex- clusively to Radio. Over 100 pages packed with the latest Set-Building Kits—new Short Wave, All-Wave and Broadcast models. Also the greatest if line of Radio Parts and accessories ever listed—at unbeatable low prices. New Sound Equipment—new World-Wide | Radio Receivers, ete. Write for this valu- able book. It’s FREE. Address Dept. B, 833 W. Jackson Blvd., Chicago, IIl. OR: RATION j „JACKSON BLVD.. “CHICAGO ILU: PYORRHEA acier neton TRIPLE FORMULA—A9—B17—0C 54. does what no other method will do Despalr no longer. Here Ie the very Triple Formula TRIPLE method used with success by Famous European dentist surgeons Ín thousands and thousands of TREATMENT ceses. Now available In America. No sufferer of $ Pyorrhea and Embarrassing Mouth Odor should be 3 another dey without the blessed relief and definite expectation of cure that Triple Formula A9-817. COMPLETE € 54. brings -- and on an absolute guaranty basis. The complete Triple Formula consieta of A-9 Concentrated Applica- tion Liquid, B-17 Highly Antiseptic Wash and C-54 Special Medicated Dentifrice. It is essential to use all three in this great auccesaful method, and all three -- à month's supply -- come to you for only $3 postpaid. If, after 15 days’ use, you do not have foll expectation of a complete cure, your money will be refunded in full, You heve nothing to lose, end health and happiness to win. Aet Now while the Special Introductory Price is stil) In force. Send only $3 for the fuli $8 A-B-C Triple Formula Treatment. But doit TODAY: A. B. C. Laboratories, Dept. D-13, Richmond Hill, N. Y. Amazing New Automatic Oil Burner ,; 4 Saves you $50 to 1 "Quiet, Satont ‘Special offer "to DEALERS I'll ship you a semple burne er, on approval, subject to examination, no obligations Write on letter-head for my plan. L. A. Cocklin, Pres, end NO LACO OIL BURNER CO. 245 Union Ave. Griswold, Jowa Only 15 minntes e day with these WONDER BOOKS will prepare, you for a good drafting job in lesa than a year. lechanical and architectura) drafting from simple straight lines to important complex plans. A si eta time! Built especialy for beginners, for men wt: pag These Ra schooling. Drafting room practice, PLU i INEERING, made easy and clear, Includes come 5 Big Ploto course In biue-print reading. Quick Way to Learn B Oo o k sS Competent draftsmen are urgently needed right now in all building and manufacturing lines at $30.00 to $75.00 Shi ped B week. That's just the beginmng—FOR. DRARTSMEN P. HAVE THE BEST CHANGES FOR ADVANCEMENT. ! Pleasant, fascinating work, easy to learn end do. Lea: quickly with these books. Complete set of drawing | * etruments if you send for these drafting books NO ee LLELE LL] American Technlosi Society, Drexel at 5Bth St., Dept. D-4320, Chicago, HL Send for 10 daye’ free use New 5 volume get of drafting. I will pay the few cents delivery charges. If I wish, I may return boska in 10 days and owe you nothing, buti? I declde to keep them, I will send $2.00 after 10 days, then only £8.00 & month until $24.80, the special introductory price, is pald, Send latest edition end include drawing instruments. Name ...........euee. Address .. i Attach lette ing age, occupati that of at least one business man as a reference. s and 10 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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Crowds a lifetimes Progress in 400 Days The Amazing But True Story of LaSalle Student Brown’s Career a [ISHS ek How We Build Men, This man’s career may_ seem amazing to you, but to LaSalleit f is not so unusual. Along with Brown, thousands of others have, these past years changed poorly- paid jobs to well-paid positions of honor and trust. Training some 825,000 men and women has taught us that | Success demands three things. If you have all three, not even a major business depression can stop you from getting ahead. First of all, ¢raining—the abil- ity to do a job better than the next man. LaSalle home-study training is recognized as a quick way of acquiring such ability. Second, there must be a Success Plan. This, LaSalle also supplies —bringing you expert consulta- | tion on business and personal problems; helping you overcome handicaps; building confidence ... Speeding you ahead. Third, and this is vital—there must be ambition; the courage to stick! Given this, LaSalle can supply all else you need to win success. This coupon is your. test—this minute can be the most impor- tant in your life! Why not send “I had to work 12 hours a day, study- ing at odd moments. I used to sneak my books to work, sensitive to ridi- culing friends. They were the ‘poor saps’—for not one of them has since bettered himself in life." “Its almost unbelievable—but just 2 year ago, I was living in a little board shack, trying to raise a family on an unskilled man’s pay. I decided—since everything else had failed—to try LaSalle home study.” : the coupon NOW? “The boss's eyes were sharper than I | |. “On my new job, I immediately ape epe pipi minc anis earl s reckoned; within five months Í was plied the things I had learned through L A S ALLE EXTENSION suddenly promoted from 'Hey, you* | LaSalle. „I organized a maintenance to ‘Mr. Brown’ with the title of Night | | system since adopted by other com- UNIVERSITY Superintendent—over the heads of panies. A director said “Brown knows men twice as long with the company.'* more about handling men than any Dept. 4493-R, CHICAGO, ILL. other man in the company’.” Kindly tell me about your Success Plan and training in the business field I have checked below: O Higher Accountancy D Law O Business Management Li Modern Salesmanship O Business Law O Business Correspondence O Expert Bookkeeping O Industrial Management O Business English O Personnel Management O Traffic Management be cov c a JÅ | Address.....- — PEE EEEE "e 2 Hoe ae pig iuum pube “As I stand in front of my new home, Position cernere em eee e na remarkable LaSalle booklet, ‘The I am proud that in one year I have i Second Milestone.’ I have been a made what is lifetime progress for speaker on business methods, and 4 | many men. Now I'm buckling down urged to run for political office. My to more LaSalle training to meet umm eub deg wed. qq UMS ORDER ME EXTENSION UNIVERSITY “Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 11

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hia PAT ENT INVENTORS Mie for INTERESTING INVENTIONS An Early Revolver This early Colt re- volver was patented in 1836. Samuel Colt, its or- iginator, was known as the boy inventor, While still a lad he ran away to sea and whittled the first model of a repeating fire-arm out of wood during his leisure moments on ship- board. Colt is à good example of the inventor who was persevering. Three years later, in 1839, he had made improvements to produce the second revolver shown here. lt was used in the Mexican War with excellent effect. By 1852, Colt had the largest fire- arms factory in the world. Colt died a very wealthy man. This is an early Gillette Safety Razor and the beginning of one of our greatest modern commercial enterprises. Mil- lons of safety razors have since been sold all over ihe world and millions of dollars of profit have been made. For centuries men shaved with the old straight edge razor. Then came Gillette with his happy idea. Many Little Ideas Have Big Commercial Possibilities Look around in any direction today and see the inventor's handiwork. Many of the most successful inventions have been the small things found in ten- cent stores, drug stores, hardware stores and the like. Many inventions have come from men who did not consider themselves inventors at all. If you have an idea which in your judgment will make money, save money, save time, save labor or give pleasure— then see about protecting your rights to it. It costs you nothing to learn the facts. The Patent Laws were made to protect the poor man and the rich man IS But you must know how to take advantage o em. ee ECEIVED your book, ‘Patent Protection'," writes an inventor, “and I am only sorry that I did not have the information contained therein some thirty years ago. | have been unfortunate enough through my ignorance to lose out in at least three major instances where understanding would have helped immeasur- ably.” Another inventor says: “In going through your book, one of your mechanical movements gaye me an idea that I am sure I will be able to use in my invention.” We cite these statements from inventors simply to emphasize one point: Ignorance is dangerous, where Patent matters are concerned. The easiest way for an inventor to lose his rights, his possiblo profits, is to do nothing simply because he doesn't know WHAT TO DO. That is why inventors by the hundred have wel- comed the book shown on the opposite page. It tells them WHAT TO DO. Its facts are valuable, often vital. They may be the means of saving money, saving time, and most important, saving later disappointment. Can You Answer These Questions? How the Patent Laws protect an inventor? What is the first simple step to take to establish a claim to an invention? What kind of a sketch or drawing is needed? When is a model needed? What can an inventor do to secure financial assistance? Why a Patent is necessary? What can be Patented? What a competent Patent Attorney can do for you? What will it cost? What is the preliminary search and why it is important? These and other questions are answered in our 48-page book of facts, “Patent Protection." In it, we have tried to put the practical, usable information which from thirty-six years' experience we know the average man requires. Among other things it shows interesting inventions, 115 mechanical move- ments, views of the U. S. Patent Office, and much more. |t is yours for the asking. We gladly send it with our compliments to serious, interested men. HOW WE HELP INVENTORS For thirty-six years—more than a third of a cen- tury—it has been our business to help inventors; to assist them in securing ALL THE PROTECTION TO WHICH THEY ARE ENTITLED. We have represented not a few inventors, or a few hundred, but THOUSANDS of them in their dealings with the U. S. Patent Office. We answer questions—thousands of them a year. We study each device to bring out its best Patentable possibilities; we often dissuade inventors who might have gone ahead with inventions which could not possibly have been protected. By methods of effi- ciency, carefully developed over a long period, we endeavor to keep expense at a minimum. We arrange deferred payments where they are needed. 12 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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This is a NEW- Book About Selling Inventions There are two sides to every inventive suc- cess: There is the inventive side, which deals with the invention itself. There is the com- mercial side, which is the way the inventor sets about getting his invention on the mar- ket. A good invention, poorly handled, can prove a failure commercially. An ordinary in- vention, properly handled, can be made a money-maker. In a NEW special booklet, just published, we give you some suggestions on “When and How to Sell an Invention". We &lve you practical hints and advice on the commercial slde of inventing. Write us a card, letter, or use the handy coupon. Look before you leap. KNOW THE FACTS. They cost you nothing. They can be worth much. STRICTEST SECRECY With these two booklets we will also send you a FREE copy of our "Evidence of Invention’ form, on which you can sketch and describe your invention and £ establish a date of disclosure. Such a dated disclo- suro may later prove important to you. We send full instructions for its use. Any letters, sketches, draw- * ings or models you send us are held in STRICTEST ; SECRECY. You can write us frankly, But your first step is lo get the facts. Sign and send the coupon now. Get that much done today. Thank You for Mention'ng Modern Mechanix and Inventions for April When Writing to Advertisers 13

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YOU CAN REPEAT ALMOST EVERY EXPERIENCE IN LIFE —EXCEPT lje- itself Topay is life. Tomorrow is a hope. Yesterday is a dream. Nothing is so dead as a day that has passed, Only the trailing clouds of memory remain. One foday upon another today—how quickly a decade is built! Youth approaches manhood in high heart, embraces maturity as the period of his conquest, then "remembers with a sigh the days that are no more." So life goes —like that. NOW is the only oppor- tunity. NOW is the moment of success, NOW men decide— NOW men win or fail. Are you one of the men who are wondering today what will happen to them tomorrow? Then remember this: Jf you take care of today, tomorrow will take care of itself. And one of the most important safeguards you can take is to be certain your training is modern . . . that you are adequately equipped to master the problems of 1935. Today, in almost every line of human endeevor, ambitious men are modernizing their training by spare-time study of International Correspondence Schools Courses. Their action is a guide to you—and NOW is the time to act! Complete information on any subject in which you are interested will be sent without cost or obligation. The coupon is for your convenience. Return it today. INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” Box #321-C, Scranton, Penna, ` Without cost or obligation, please send mé & copy of your booklet, “Who Wins and Why, pod | full particulars about the subject before which I have ‘marked X TECHNICAL AND ‘INDUSTRIAL COURSES O Architect O Aviation Engines O Architectural Draftsman Lj Automobile Mechanic O Building Estimating O Plumbing O Heating Wood Millworking D Air Conditioning Contractor end Builder B Sheet Metal Worker L1 Structural Draftsman U Structural Engineer D Electrical Engineer O Electio Lighting O Welding, Electric and Gas O Reading Shop Blueprints O Telegraph Engineer B Telephono Work O Steam Engineer D Steam Electric Engineer D Civil Engineer OR. R. Bridge and Building Foreman echanieal Engineer OR, R. Signalman B Mechanical Draftsman [m] Highway Engineeri D Machinist D Toolmaker D Chemistry DJ Pharmacy O Development and Protection O Coal Mining Engin New Products D Navigation O Boilermaker E] Petternmak: D Textile Overseer or Supt. D Heat ‘Treatment of Metala D Cotton Manufacturing O Bridge Engineer G Woolen Manufacturing J O Bridge and Building Foreman H Agriculture D Fruit Growing D Gaa Engines O Poultry Farming [O Radio O Diesel O Marine Engineer BUSINESS TRAINING COURSES O Business Management Businesa Correspondence O Office Management LI] Lettering Show Cards O Signe O Industrial Management O Stenography and Typin D Traffic Management D Civil Service D Mail Carrier O Accountancy end C.P.A, D Railway Mail Clerk oaching O Bookkeeping O Grade School Subjects O Secretarial Work D High School Subjecta D Cost Accountant O College Preparatory [mj Salesmanship [ Advertising Cj First Year College O Service Station Balesmenship D Illustrating O Spanish : D Cartooning O French O Wallpaper Decorating Salesmanship D Lumber Dealer pon to the International df you reside in Canada, send this cou; Correspondence Sohoole Canadian, Limited, Montreal, Canada 14 Hollywood is a Primary SCHOOL FOR LOVE according to DR. W. BERAN WOLFE in the April MOTION PICTURE "As long as our schools and universities do not institute courses in the art of be- ing a good lover, the art of beinga good wife, the technique of holding your hus- band, or the science of making your wife contented, lovers, old and young, male and female, will have to find instructions wherever and however they can .... By and large, Mr. and Mrs. John Amer- ican go to the movies for instruction in love." LEDERER: MAN OF ACTION, also heads the list of features in the new ten cent MOTION PICTURE for APRIL. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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REAL RADIO ENGINEERS! Learn Radio from these men! Just see who they are! All top-notchers in their profession—selected by the great Radio concerns they work for to supervise and direct your Training. Learn Radio the way the Radio Industry wants you to learn it--the Shop way—the practical way—the real money-making way. Only the Radio & Television Institute can offer you this chance to get your Training from real Radio Engineers working right in the heart of the Radio Industry. MANY RTI TRAINED MEN "§06°75 244. Don’t waste time on a small-pay, no- future job when hundreds of men are drawing down $50 to $75 every Saturday ae R-T-I Trained Experts. Get ready for areal job. Get into Radio now. My big FREE book tells you how you can learn at home to fill good-pay full-time or part-time Radio jobs. Good-Pay Opportunities, Everywhere Broadcasting Stations, Factories, Deal- ers and Distributors and others-all use “trained” men, and pay up to $5000 a year. Auto Radio, Short Wave Radio, Photo Cells, Public Address Systems and Sound Pictures have created thousands of good-pay jobs. This is a big yearfor Radio. New developmentsin receivers alone, de- mand up-to-date trained technical men. Get the facts in my free book. Learn At Home, In Spare Time : Hold your job. Keep down expenses, My famous method of home training—en- dorsed by more than 50 leading Radio manufac- furers—gives you ENDORSE and RECOMMEND. SEE WHO THEY ARE! READ WHAT THEY SAY. = ABOUT R.T.t TRAINING. FIND OUT-WHY.THEY. ENDORSE AND RECOMMEND. THIS- SCHOOt. simplified, practical training along workshop lines. In afew short months many R-T-I Trained men step out of poor-pay, no-future jobsinto big-future Radio work paying $50 to $75 & week and up. Many Make $5 to $2) A Week Extra In Spare Time, Whiie Learning C. E. Head, Alexandria, La., wrote: “Made $14.25 in spare time eleven days efter enrolling.” L.M. Christen- sen, Deweyville, Utah, wrote: “Got my first spare-time job two weeks after enrolling. Have al- ready made $250 do- ing spare-time Radio work." 4 Big Working Out- fits Included, No Extra Charge These outfits devel- oped by Engineers directing R-T-I Training to make your Training Real Shop Training for the home. Can be used in your service work. Money Back If Not Satisfied To leam Radio my way you don’t have to be a College man, - or even a High School graduate. My Train- ing is practical shop training for the home. It is the Training en- dorsed by 50 leading radio manufacturers. A| Kendall Clough, Chief Engineer, HERE THEY ARE: Clough-Brengle Company, "| E. E. Gramer, Chief Engineer, Budd ‘Transformer Corpora- ion, Karl E. Hassel, Chief Engineer, Zenith Radio Corporation, H. C. Tittle, Chief Radio Engineer, fi General Household Utilities (Grunow), i F. D. Whitten, Service Manager, Chicago Branch, Philco Radio & "Television Corp. , ali of Chicago. Dr. C. M. Blackburn, Radio En- gineer, P. Malory & Com- pany, Manufacturers of Radio Apparatus. Dear_Mr. Smith: Due to my R-T-I Training I was made m&n- ager of the Radlo Department of acity department store, work- ing up over the other four service men wha had been there for some time. Howard N. Lentz 123 W. Alexander St. Buchanan, Mich. Dear Mr. Smith: My knowl edge of Radio, gained through R-T-I Training, hag won me the position of assist- ant to Chlef Engineer of Radic Station WHO. The pay is very good and every day E make use of what I learned in your lessons. D. A. Whitney Des Moines, Iowa MAIL COUPON FOR MY FREE BOOK See who these big Radio firms are and why they endorse R-T-I Tralning and recommend it to you. See the hundreds of pl tures, the proofs, the thusiastic letters of R-T-I men. Act to- day. Mail the coupon now. RAY D. SMITH, President RADIO & TELEVISION INSTITUTE CHICAGO ne -- uw mu EN NO US E UND EC GN RAY D. SMITH, President, [ Radio & Television Institute (A-T-1} 2130 Lawrence Ave., Dept. 34, Chicago, lil. I Dear Mr. Smith: Without obligating me, rend me Four book that explains your Engineer-Directed and o ndustry-Endorsed method of training men quickly I and Inéxpensively at home in their epore time to be Radio Experte. E city... Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 15

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Watch this page for the solution of your own mechanical problem. USING OUTBOARD MOTOR INBOARD I would like to use an outboard motor in getting my 27-foot sailboat in and out of a crowded harbor, but find it impractical to mount it at the stern in this particular boat. Do you think it practical to place the motor inboard, with the shaft going vertically through the hull through a pipe and bushing ar- rangement, about 6" to either side of the kecl?— R. E. W., Chattanooga, Tennessee. A British outboard engine manufacturer is now supplying an adaptor for stock outboard motors which permits inboard use. The prob- lem, of course, is to get a perfectly water-tight bearing. We would suggest you consult with the manufacturers of your particular engine; they may be able to supply the special bear- ing needed. Many sailboats in this country could use such an outboard-inboard rig to advantage. MAKING LUMINOUS PAINT AT HOME Do you have a simple formula for making lumi- nous paint suitable for outlining house numbers? — M. M. M., Clay Center, Nebraska. Paint made according to this formula will give off a violetlight at night: Take 100 parts by weight of strontium carbonate, 100 parts sulphur, .5 parts potassium chloride, and .4 parts manganese chloride. Heat these ma- terials for from 94 to 1 hour, to about 2,350 degrees F. To make this phosphorescent paint effective, expose for a time either to direct sunlight or to a mercury vapor lamp. TWO CARBURETORS ON AUTO I had the intake manifold of my 1929 Ford re- built to take two carburetors, but now only two cylin- ders work good at a time. Different cylinders can be made to fire properly by adjusting the carbu- retors, but there are always two which fire weak. Please tell me why my Ford will not work with two carburetors.—K. O. K., Wadena, Minn. With two carburetors you are supplying too much rather than too little gas, and flooding one or more of the cylinders. The unburned fuel simply retards the combustion. We doubt whether it is possible to get the two 16 carburetors to supply exactly the same amount of fuel at the same pressure to make all four cylinders respond alike to the throttle. SELLING MINERAL RODS I can make mineral rods which will work as well as any now on the market, giving a signal when the contact points are pushed against metallic bodies buried in the ground. Though my rods are the same shape as those now out, they are larger and made from different metals. Can I sell my own rods without getting into trouble because of patents? —J. F. S., Dover, New Hampshire. If the principle upon which your mineral rod works is the same as that of some patented product, you are of course infringing, regard- less of whether you change the size and color, or use different materials. We advise you to have a reliable patent attorney check over existing patents on mineral rods first. BULLET TRAJECTORIES Why are the rear sights of rifles always raised when shooting at distant targets? —W. D. L. Ful- ton, Mo. A rifle bullet drops 32.2 feet for every second of its flight, regardless of the speed it is travel- ing, because of the force of gravity. With the rear sight raised the proper distance, the barrel automatically is elevated enough to offset this force of gravity when the sights are on the target. RECUTTING OLD FILES Can old files be treated in any way to make them serviceable again?—R. S, J., St. Louis, Mo. Boil the files in a strong bath of caustic potash, clean with a hard brush, then wipe off the liquid. Dip into nitric acid for half a minute, then move the file over a blotter or cloth stretched tightly over a flat surface. This will leave acid in the grooves, cutting them deeper. Repeat the acid treatment until the desired depth is obtained, then rinse and dry the files. Apply olive oil, wiping off any ex- [Continued on page 19]

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A Mlagically Uissuve WORLD-WIDE HIGH FIDELITY RECEPTION with This Amazing New 7 MIDWE ‘ST - l6 FURI BEALE adio! . ALL FIVE WAVE BANDS ) " T = ONLY RADIO COVERING = 910 2,400 METERS. 42, 000 MILE: TUNING RANGE THE almost magical Rare of thissuper Midwest “Fifteenth Anni- radio is startlingly human!As domestic and versary” catalog and see how you foreign stations oho in,‘many automatic can save from 14 to 12 by buying direct adjustments are constantly being madeinside the from Midwest laboratories. Learn why Midwest set. It might be said that a number of “Invisible outperforms sets costing up to $200.00 and more. Hands” enable you to bring in and hold any sta- Now save 30% to 8007. Never before so much tion you desire from the whole world of broadcast radio for so little money! Midwest gives you ».regardless of fading and interfering conditions. triple protection with: One-Year Guarantee, Fore Beforeyoubuy any radio, writeforthenewFREE elgn Reception Guarantee, Money-Back Guarantee. Only Midwest Offers Multi-Function Dial 50 ADVANCED FEATURES Y eluxe Audiorian -Type , This exclusive dial is not an ordinary Exclusive “Invisible Hands” features include: High Level S P? EAKER 00 airplane dial—but a many-purpose Automatic Volume Control Action, Discriminating Auto- A caet unit that performs exclusive functions. matic Tone Control, Multi-Function Dial, Miero-Tenua- Send for FREE miniature dial show- tor, Fidel-A-Stat, etc. Only Midwest covers a tuning low ing these outstanding advantages: range of 9 to 2400 meters (33 megacyelcs to 125 KC)— DOWN 1. Dial calibrated in Kilocycles, Megacycles enabling you to easily and successfully tune in even and Meters; low-powered foreign stations up to 12,000 miles away. Hears His Native UIT 2. Call Letters of American Broadcast Sta- A]| 5 Wave Bands enable you to enjoy today’s "fnest High Fidelity Acushnet, Mass.—I tuned in CTIAA, Lisbon, tions printed on Dial and Illuminated; American programs. In addition, you get Canadian, police, amateur, Portugal, my birthplace...clear as a local, 3. Slow-Fast, Smeoth-Action Tuning; airplane broadcasts. ‘commercial and ship signals...and delight in èx- e^ Heard usic and songs of 4. Station Group Locator; citing world-wide broadcasts from England, "France, Germany, Spa my eount 5. Simplified Tuning Guide Lights: Italy, Russia, Australia, eto. Send today for money-saving actol alone ig worta 6. Automatic Select-O- i more than low Fina titted bolster Indiate ^95 — SENSATIONAL HIGH FIDELITY RECEPTION ]| price F paid for 8. Silent Shadow This bigger, better, more powerful, clearer-toned, super-selective, Midwest. Tuning; 16-tube "Invisible Hands" radio gives you absolute realism—assures Ki Z you of life-like, crystal-clear tone, unlike anything you have ever WP i 9. Cont ralized experienced before. You will hear one more octave—overtones— Soo. Rome. es that cannot be brought in with ordinary radios, Now, hear evel DJA, Germany instrument, every voice, every shade and inflection of speec! end many other foreign sta« tions. Anibal N. Ferreiria. DEAL DIRECI WITH LABORATORIES Increasing costs are sure to result in higher į Py radio Tices Soon: Buy before the big advance OW. while you can take advantage of Midwest s sensational values. No middlemen's rofita to pay! You ean order your Midwest 9, High Fidelity radio from the new Midwest p MIDWEST RADIO COAP., Agents New Style Contoles he Midwest 36- page catalog pic- fures a complete line of beautiful, ar- tistic‘de luxe consoles » and chassis in four H Wri catalog with as much certainty of satisfaction Dept 5 lo, Easy © MEE talo fore d as if you were to select it in our great radio laboratories With Her E kin end Money $ F. catalog Y! You save 30% to 50% when you buy this popular way...you out blir y per, e a FREE 1935-30 log, | Check Here Midwest long-range get:30 days FREE trial..as little as $5.00 down putsa 8 FREE Miniature Di and com | for — and com- : for radios are Midwest radio in your home. Foreign Reception, lete details of your liberal 30-dey vicsd as Y ) (2 Se Due Year and Money-Back GUARANTEES. pr FREE trial offer. This is NOT en ordor. Lee OW AS cee Io» you! Write for FREE catalog NOW...TODAY? MIDWEST RADIO. CORP. DEPT. EEBY— CINCINNATI, OHIO, U. S. A. Established 1920 Cable Address Miraco..... All Codes Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 17

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WOOD IN CANS WILL FIX THESE OLD NAIL AND SCREW HOLES Handles Like Putty Dries to Hard Wood Plastic Wood Becomes a Permanent Part of the Object Repaired Plastic Wood is actual wood that comes in cans and tubes—can be moulded with the hands—when dry it is hard, permanent wood that can be sawed, planed, sanded, drilled, turned on a lathe—will hold nails—can be painted, varnished and lacquered perfectly—it is water-proof and weather-proof. Plastic Wood will adhere to any clean, dry sur- face—wood, metal, glass, stone or porcelain. Sold at all paint, hardware and department stores. FREE Write The A. S. Boyle Co., Inc., Dana Ave., Dept. M. M. 4, Cincinnati, Ohio, for interesting booklet, *'200 Things to Do With Plastic Wood.” 1934 Shaw Band Saw Six inch Band Saw cuts stock 212" thick. Tilting Table 8"x8", 45" or 14” Saws, Roller Guide, piece iron frame. $1.00. Bal. C.O.D. Postal nV A, $9.25 SHAW TOOL CO. 431 No. Tenth St. MILWAUKEE, Wis. „Neur READY SHAPED Get thls sensational sailboat kit. Make authentit speed models in a few hours, All the hard work is done for you. Hull is already shaped and hollowed. Needs only smoot ing down and painting. Then you "step" mast, adjust sail, rigging and rudder and she's ready to launch! Watch her go! See her outdistance all competition. Easy to follow instructions and all necessary parts furnished. Kits as Low as 25¢... Buy Racing Craít Kis at opi or department store. If they can’t Pp be send money order for 7 solid hi z 3 p hollow huil kit, $1.00, o t, 82.50. Set TAN ms T HORN ECRA ‘Dept. 24. 2518 Montrose Ave., Chicag DEGREE IN TWO YEARS i B.S. Degree in Electrical, Civil, Chemical, Radio, Mechanical or Aeronautical Engineering in two years, Located in an industrial center with fat Engineer ing atmosphere. Earn board. Low tuition. Preparatory Department, Enter Mar., June., Sept., Dec. Catalog. INDIANA TECHNICAL COLLEGE 240 East Washington St., Fort Wayne, Indiana Complete description of Drake books, covering RADIO. AVIATION, ENGI. NEERING, AUTOMOBILE WORK, BATTERY WORK, ELECTRICITY, BUILDING, SHEET METAL WORK, PAINTING, SIGN MAK- ING, LETTERING, COMMERCIAL ART, will be sent to you on request. Frederlck J. Drake & Co., Dept. 2 202 179 N. Michigan Bivd.. FREE = CATALOG OF PRACTICAL BOOKS J. H. WINN ae CO., Dept. 204, 124 W. 23 St, New York ^. | BIG MONEY m The American Electric Method enables you to build a nice business of your own. Income practically unlimited. Government Housing Program creating greater fleld than ever. Work easy to get by our tested plan. Small amount starts you. Write today —No obligation. THE AMERICAN FLOOR SURFACING MACHINE CO. " 536 So. St. Clair St. Toledo, Ohio Dn en Ats OPPORTUNITIES 18 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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Problems Editor Answers Queries [Continued from page 16] cess, to retard clogging of the teeth and make cleaning easier. Clean the file with a scratch brush and add more olive oil after use each iime. Files often lose their cutting power because the grooves become clogged with filings and only a smal! fraction of the cutting edges are effective. Where iron is clogging the file badly, immerse the file in blue vitriol (copper sulphate) for a few minutes, rinse in water, and then use the nitric acid treatment. File ridges filled up with zinc can be cleaned with dilute sulphuric acid. HEADPHONES ON MODERN RADIO How can headphones be hooked up to a modern radio set having a dynamic speaker?—H. L. L., Chicago, Ill. ` Loudspeaker and phones can be operated at the same time with fair results by connecting the earphones in series with the speaker voice coil, To operate the phones alone, short out the voice coil, or replace with a 10,000 ohm volume control. The voice coil leads are those going to the tiny coil pasted on the paper cone. DIAMAGNETIC METALS When a bar of pure bismuth is placed near the poles of a permanent magnet, would the repelling force be as strong as the attractive force obtained with an iron bar of the same size?—R. J. B., On- tario, Canada. Though bismuth is the strongest diamag- netic metal known, it is pushed away from a permanent magnet with only a small fraction of the force with which. the same magnet would pull iron. This effect can easily be dem- onstrated with a strong permanent magnet. HOMEMADE DIVING SUITS I would like to make a waterproof suit for use with the diving helmet described in the 1934 How To Build It book. What materials will serve best as a protection against cold water?—F. S., Pontiac, Mich. Rubberized cloth, obtainable at photo- graphic supply stores, under the name of “focus cloth,” is a light, strong and waterproof material which could be used for a diving suit. All seams can be fastened with rubber cement. You may also use ordinary canvas which has been thoroughly impregnated with a mixture of one pound of paraffin dissolved in one gal- lon of gasoline. Soak the canvas in this after sewing the seams. Double stitch all seams. (Editor's Note—All letters sent to this department should include a stamped, addressed envelope. Write to M-M Prob- lems Editor, 529 South 7th Street, Minneapolis, Minn.) WHEN you drain out your anti-freeze, drain out the rust, scale and impurities that have collected during the winter, Give the radi- ator a thorough cleansing with Sani-Flush. You can do it yourself. In very few min- utes. For very few cents, Absolutely safe. Just pour half a can of Sani-Flush in your radiator. (Directions on the can.) Run the engine. Drain out the dirt that clogs the cooling system. Your car will run better, You'll save expensive repair bills. Yowll probably find Sani-Flash in your home. Thousands of women use it to keep toilet bowls glistening. If it’s not there, buy a can from any grocery, drug, or hard- ware store—25c. The Hygienic Products Co., Canton, Ohio. ` Sani-Flush*; 3 KEEPS RADIATORS CLEAN ment of Metallurgy, Lehigh University, and OWEN L. SHINN, Ph.D. Professor of Applied Chemistry, University of Pennsylvania. INTERNATIONAL- SCHOOL OF. CHEMISTRY ^ Ascoolated with the International Correspondence Schools Box 2323-C, Scranton, Penna. Without cost or obligation, please send me full details of your home-study course in O Analytical Chemistry O Chemleal Engineerin O Short Chemistry Course 5 Pharmacy O Industrtat Chemistry Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 19

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Random Chips from Midget car fans, boat builders, and radio hams, here’s good news for you. And if you are planning an auto trailer, get in- side information here on a movie stat’s trailer that you can build from MM. HEN we published that excellent story in the March MM, “Television Will Carry the Mails,” we overlooked granting Alfred Albelli his just credit for obtaining that instructive and revealing article from David Sarnoff, President of the Radio Cor- poration of America. To be fair to both Mr. Sarnoff and Mr. Albelli, our New York cor- respondent, the by-line on the story should have read “By David Sarnoff, President of R. C. A., as told to Alfred Albelli.” * * * Spring may stir some persons to poetry, but it brings the home worshop fan out of hiber- nation. Judging from the letters we have been re- ceiving, he wants to build midget cars, auto- mobile trailers, portable radios, and boats. This issue has them all except the trailer— and we'll tell you about that later. We're not trying to sell you this issue be- cause if you've got this far you've already bought it. But you had better get your order J. E. Bowers took third prize with these photos of his bunga- low trailer. At left trailer is ready to be occupied. Frame work without canvas roof is shown at right. "Trailer folds up. 20 Three types of midget cars built by MM readers. Jere McWethy, 12 years old, of Aurora, Ill., built the car at top. Jack Pinnick, 16, made a chassis of bed rails for the car at left. Ken Leiser of Madison, Wis., uses the car at right for advertis- ing at his filling station. Jere and Jack have Briggs and. Stratton motors. Ken has a one lung motorcycle engine. in now for the May MM. It will contain one of the most unusual automobile trailers you have ever seen and it comes to us right from Hollywood. We'll keep you guessing what movie star's trailer it is until next month. * * * Before you build another radio set get a copy of MM's newest book, *Radio Builders' Manual.” There is nothing like it on the market. It has everything —short wave Sets, converters, adapters, auto radios, all-wave receivers, trans- mitters, and erystal sets. It's written so that anyone can build a set that will work and get distant stations. “Radio Builders’ Manual” will be on the news- stands in a few days. If you want to get your order in early, send 50 cents to Mopern MECHANIX AND In- VENTIONS, 529 S. Seventh St., Minneapolis. * * * Let's get around to our prizes and letters before they get squeezed out. First prize of $5.00 for the best picture of the month goes to Harry Sapp, the first reader to send us photos of the “knee action" midget car in the Sep- tember, 1934, issue of MM. He tells us: This 15-foot boat, his first wood working project, won second prize for O. H. Ryerson, Columbus, O.

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Mt. Holly N. J. Dear Editor: Enclosed find photos of a power push- mobile that I have built and tested. The motor was formerly a two cylinder motor, but one of the walls became cracked so I converted it into a one lung affair. The car was built from your September issue. Wagon wheels were used with 114” by 3” stock. The free action in the front really helps because it keeps the frame from twist- ing. It worked the first time I took it out and attained a speed of approximately 25 m.p.h. Several boys in town are building the midget and we might lay out a track and race them. Harry Sapp. Twenty -five miles an hour on half an engine? Wonder what kind of speed- ometer Harry used? Well, he gets the five dol- lars anyhow. * * * The man who tackles a fifteen- foot boat as his first woodwork- ing project ought to get a prize. Jack Miner, owner of a famous game farm, caught lake trout by That’s why we taking Robert Page Lincoln’s tips. sent a check for $3.00 as second prize to the writer of the following letter: “REAL SHAVING COMFORT NEVER COST ME SO LITTLE!” € “I never dreamed a low-priced blade could shave a tough beard like mine until I tried Probak Jr.” writes T. C. Schreiben Je. “Now I get clean, easy shaves with never a bit of irrita- tion and I'm saving money on razor blades.” in the September MM Construction of this ‘“tknee-action” midget car was described Columbus, O. Dear Editor: Enclosed herewith is a snapshot of a Doane Hydrobout, 1517/x5/2", powered with a Star motor. The speed is approximately 27 miles per hour. The framework is constructed entirely of inch white oak. By following Doane’s con- [Continued on page 22] Get the benefit of unequalled manufacturing Probak Junlor 1s a methods—automatic tempering, grinding, hon- Product of Gillette ing and stropping. Enjoy real shaving comfort 9nd fits all Gillette at lowest possible cost. Try Probak Jr. and Probak razors. Thank You for Mentioning Modern Mechanix and Inventions for Apri? When Writing to Advertisers Harry Sapp built it, sent in the photos and won first prize of $5.00 in this month’s contest.

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"Experíence is a great teacher— but you can learn more from books, quicker and cheaper." And the author of that sentence might have added “AND SAVE YOUR JOB AT THE SAME TIME" if he had thought of a machine shop when he wrote it. A ruined piece of work these days usually means a lost job. Only good men have jobs now, and to keep them they must make themselves top-notchers. You ean do a lot toward insuring your own job with the— American Machinists’ Library & volumes—2,000 pages—2,500 Illustrations (A combined home-study course and reference library) oe Mon qp Teel PH CIAND A GAGE TED Thee THER) rpg M Wonk E = =~ COLVIN = Comics 2 CON TANLEY- HAAS Suey JUDE OPERATION OPERATION: == i S EET Cony A STANIEY ERE is a Library thet gives you expert information on every point of your work. It fully explains and illus- irates tool and gage work, machine tool operation, iigs and fixtures, punches and dies, the working of steel, oper- ating lathes, drills, hand and automatic screw machines, planers, boring machines, milling machines and a thou- sand and one other points of information which you need every day. Solves Your Problems No matter what the problem is that puzzles you, if it is enything to do with a machine shop you will find it answered in these books. Whether you are a tool maker, & die maker, a draftsman, or handling any job there is in & machine shop, this Library contains the practical infor- mation you need. The text is written in language intended for the practi- cal man. You will recognize it as sound, practical, machine shop talk all the way through. This is THE Library which will make you feel surer of yourself and of your job. You owe it to yourself and your future to mail the coupon at the bottom of this page AT ONCE. Free Examination—Easy Monthly Terms Look over this helpful library for 10 days without obli- gation. Thousands have used this plan to satisfy them- Belves. If you decide to keep the books, pay for them as you_use them, in easy monthly installments. Fill in and Bend the Free Examination coupon now. PP Bee 9» 9c» o9 99 cw 79.99.9979. 9.799999 99. ‘FREE EXAMINATION COUPON; 6 McGRAW-HILL BOOK CO., Inc., 330 W. 42nd St., New York. g Ý Send me for 10 days’ free examination the AMERICAN g f MACHINISTS’ LIBRARY. If I keep it I will send you $1.50 g gat the end of 10 days and $2.00 monthly untill the Special Price " g of $17.50 has been paid. If not wanted X will return the books " $ postpaid. , Signed .............. eee eesenesssessesubovevenocceceoeeeeevo f city and State. ; Company. «.:.c.emercssnekc ues gd eerie us Arai Re MMX-4-85 4 CAO*.CAS- Wc CRX X UA C» V9. AUS CALO 99999 99 : Position Chips from the Editor's Workbench [Continued from page 21] struction plan exactly, I have built an abso- lutely tight boat. . This boat was built entirely with hand tools and only four boat builders clamps. It is the first boat I ever built and also it is the only woodworking job I ever attempted. O. H. Ryerson. * * * Third prize of $2.00 went to another MM project, a collapsible automobile trailer. West Allis, Wis. Dear Editor: I am enclosing snapshots of the Bungalow Camp Trailer that I built from plans shown in MM (May, 1932, also first edition of Handy Man’s Home Manual). The trailer may be set up in 12 minutes by one person. ‘ J. E. Bowers. + * * Here's a letter to Robert Page Lincoln. Jasper Miner and his father, Jack, run one of the Jargest game farms in the world. Kingsville, Ont. Dear Mr. Lincoln: I have been accustomed to going into Northern Ontario each fall to hunt moose. While there I heard of an inland lake six miles west of us which contained lake trout. Your articles on casting for lake trout last spring influenced me so much that on May 23 my father and I took a week's trip to this lake. We put up our tent and went out to try the trout. I started casting. I noticed my plug coming in about six feet from me and right be- hind it I caught a glimpse of a fish following it. 'The plug got just under the boat about to come out of the water when the trout arose swiftly and struck and whirled straight down and almost tore my rod inside out. Finally the trout gave up and rose about thirty feet behind the boat. I reeled in and after much splashing at the side of the boat I lifted him in. My, he was a fine fat fish, my first lake trout and he weighed almost four pounds. Well, do you know we fished for two days steady and never caught another trout? The last day there I went just below a dam and caught three lake trout in ten minutes. Jasper W. Miner. Miner goes on to ask if he should return to the lake about May 8 when the ice goes out, if he should use live bait, and what plugs should be used. Lincoln told him that a wobbling spoon is far more successful than live bait and that trolling will get the bigger trout. He also said that the best time to go after trout is just after the ice goes out. 22 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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LEARN BY The great and ever-expanding field of Radio — Broadcasting, Television, Talking Pictures, Aviatio1 Radio, Radlo Servicing — offers steady em- DOING IN ployment and a real future for young men who have the ambition to succeed. üeramous Coyne ;kearn-by-Doing" ethod of training offers you the chance of a lifeti icki t into this fascinating. big-pay field. 10 weeks, anioe in the eat Coyne Shops in cago will quality you. Coyne Graduate EMPLOYMENT SERVICE will help to PLAGE YOU IN THE JOB YOU ARE TRAINED FOR. Send coupon for details, 'PLL FINANCE YOUR TRAINING If you are short of ready cash don't let that hold you back. I will finance your training. The course takes only 10 weeks — but you don’t start paying me back until FIVE MONTHS after you start school or 212 MONTHS after regular training period. Many earn while learning. Complete course in ELECTRIC REFRIGERATION AND AIR CONDITIONING included at NO EXTRA COST to those who enroll now, Write today for my Big FREE Illustrated Catalog and full details of my amaz ) ing “Pay After Gradua- uud tion’? offer — No obliga- awe tion, SEND NOW FOR FULL DETAILS! MR. H. C. LEWIS, President, Coyne Schools, 500 S. Paullna St.— Dept. 45-1H Chicago, L Send me the BIG FREE Illustrated Book explalning your Radio Course, special cffer and Scholarship Loan Plan. i | | Do ———————— l l a 1 I l l CDT OSS saiia a | $1 VALUE For 50c This 50 page book can Order direct from author. Get FACTS on trailer design. save you 100 times its cost. Money back if not satisfied. RAY F. KUNS, Dept. 102, Madisonville, Cincinnati, O. REAL JOBS OPEN For Trained Auto Mechanics Step into Big Pay. Earn $35 to $75 a week I train you in only 8 weeks at largest schools of kind in world. New practical shop plan. Learn with real tools . , . on real equipment. Write today for Big Free Opror- : tunity Book and Special Low Tuition Offer. Address school nearest you. MS EY SCHOOLS, Dept. 22-16 Cleveland, O. or Kansas City, Mo. BREED CANARIES FOR US WE SUPPLY BIRDS AND BUY ALL YOU CAN BREED x We need thousands--paying you highest prices! N Breeders ship us birds from all parts of the country. Large illustrated Canary Book cata. logue and list of prices sent; 10c (coin) to cover cost of mailing. KRAFT BIRD CO., Dept. RR, 5 EAST 14th ST., N.Y. HAENEL “100 SHOT” REPEATER Latest Model 1935 Haenel repeating pistol, Sturdy, massive construction, easy cocking lever, 100 shot magazine. \ J For target. Powerful for small game. Blue or Nickel finish. Shoots B. B. steel shot. Wt. 18 oz. F REE—500 Shots. $2.00 deposit on C. O. D. FREE Catalog—Colts, Rifles, Binoculars, etc. { Hudson Sporting Goods, M-52 Warren St., New York WHO WANT s TO MARRY A GIRL? CERTAINLY, there is a girl you want to marryl But how are you ever going to make this dream come true on the money you're making? The wonder is not new to you. is it? Quit wondering—start acting! Thousands of men have acted by making themselves worth more money by acquiring more iraining for the job at hand and the job ahead. They have gotten thia training in spare time. Their very first step was mailing this coupon to the International Correspondence Schools at Scranton. Why don't you do it? AL CORRESPONDENCE SCHOOLS “The Universal University” Box 2318-C, Scranton, Penna, Without cost or obligation, please send me a copy of your booklet, “Who Wins and Why," and full particulars about the sSubijecb before which I have marked X: TECHNICAL AND INDUSTRIAL COURSES O Architeot O Aviation Engines O Architectural Draftsman O Automobile Mechanic O Building Estimating L] Plumbing D Heating O Wood Millworking O Air Conditioning O Contractor and Builder O Sheet Metal Worker O Structural Draftsman O Steam Engineer O Structural Engineer O Steam Electric Engineer O Electrical Engineer O Civil Engineer O Eleotrio Lighting O Surveying and Mapping O Welding, Electrio end Gas O Refrigeration O Reading Shop Biueprinta OR. R. Locomotives O Air Brakes O Telegraph Engineer OR. R. Section Foreman L1 Telephone Work OR. R. Bridge and Building Foreman O Mechanical Engineer O R- R. Signalman DO Mechanical Draftsman D O Machinist [© Toolmaker ao LJ Development and Protection of New Producta O Patternmaker D Heat Treatment of Metals O Cotton Manufacturing D Bridge Engineer O Woolen Manufacturing | ; D Bridge and Building Foreman O Agriculture D Fruit Growing D Ges Engines O Poultry Farming D Radio LJ Diesel Engines L1 Marine Engineer BUSINESS TRAINING COURSES O Business Management Business Correspondence D Office Management O Lettering Show Cards. O Signs O Industrial Management O Stenography and Typing _ 3 O Trafic Management O Civil Service D Mail Carrier D Accountancy and C.P.A. O Railway Mail Clerk Coaching O Bookkeeping O Grade School Subjects C Secretarial Work O High School Subjects OG Cost Accountant O College Preparatory O Salesmansbhip [O Advertising [] First Year College O Service Station Salcsmanship O Illustrating O Spanish O Wallpaper Decorating O Cartooning O French Salesmanship O Lumber Dealer Name... Address. Occupation. " 1f you reside in Canada, send this coupon to f International Correspondence Schools Canadian, Limited, Montreal, Canada Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 23

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$ z A Month for = 650 New South Bend 9"x 3’ “WORKSHOP” BACK-GEARED, SCREW CUTTING, METAL WORKING LATHE. ~ (less motor drive) Cash Price Praes fa kanp 9" x 3' * Workshop" Bench Lathe Complete with Re- s94 versing Motor and Reversing Switch as shown above $24 Down Balance $7 a month "THE 9-inch “Workshop”? Lathe handles all general machining operations on metals, woods and composi- tions. Cuts screw threads 4 to 40 per inch. Hundreds used in machine shops, auto service shops, home shops, laboratories, electrical shops, and manufacturing plants. Features include back-geared headstock, six spindle speeds, automatic power fced to carriage, reverse for threads and feeds, graduated compound rest. Price, $" x 3' Lathe less drive $75—$19 down, $6.50 a month. Other bed lengths 327, 4’ and 4 V/. Easy Terms. 30-day trial. Fully guaranteed. Immediate delivery. WRITE FOR BOOKLET No. 5-W— FREE = y _ This valuable 32-page booklet | No. 5-W, illustrates, describes and prices the 9-inch **Work- shop” Lathe and all its acces- sories and attachments — sent free, postpaid. Xf interested in larger size lathes ask for General Catalog No. 94 —shows Lathes 9" to 18” | swing—sent free, postpaid. SOUTH BEND LATHE WORKS 609 E. Madison St. South Bend, Ind., U.S. A. sgur fend ^ :Sneh i AWarkihon' deme S eek Grow sur famous Fancy White Queen Mushrooms. Exclusive new process. Biggar, better, quicker crops. More Money for you! Enormous new de- mand. Illustrated book free. Write today! AMERICAN MUSHROOM INDUSTRIES, LTD. 190 Woolnough Bidg., Toronto, Ont. [epee IN YOUR CELLAR ORISHED. * Send post card now for FREE TRIAL LESSON in Drafting. Prove to yourself how easy it is to learn AT HOME to make Mechanical, Electrical, Architectural or Struc- tural Drawings. DRAFTING is the key to the best paid positions in industry. New money-making opportunities now opening. Get an early start toward a good position while learning in spare time at home. We furnish all tools, etc. Send now, TODAY, for your FREE TRIAL LESSON. CHICAGO TECH COLLEGE The Success School for Draftsmen D-267 Tech Bldg., 118 E. 26th St., Chicago, Ill. BUILD RADIOS RADIO BUILDERS Price 50 Cents COMPLETE PLANS FOR ALL-WAVE RECEIVERS AMATEUR TRANSMITTERS POLICE CALL ADAPTERS CRYSTAL SETS AUTOMOBILE RADIO PORTABLE RECEIVERS az Rel at bundvedl af whee fadin plenty stunts, and trouble-hunting kinks, PUBLISHED BY MODERN MECHANIX PUBLISHING COMPANY NOTHING like it on the mar- ket. A cómplete reference book of up-to-date radio sets that anyone can build. Sono NS Building Instructions or SHORT WAVE SETS c TRANSMITTERS POWER PACKS PHONO RECORDING ALL-ELECTRIC SETS and hundreds of other valuable radio plans and handikinks. RADIO BUILDERS’ MANUAL ON SALE MARCH 10th At all Newsstands, or send 50c to MODERN MECHANIX PUBLISHING CO., 529 So. 7th Street Minneapolis, Minn. 24 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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REAL AIRPLANE TIRES! Boys, look! Airline Coaster, speedy, strong, safe. Body length 48 inches, Genuine airplane tires with inner tubes—10x3 "General Jumbo Jrs." Double drum brakes, ball bearing wheels, electric welded chassis. Rolls easy, rides swell, stops quick. Will last years. Complete $16.00 F.O.B. Akron. Less if you assemble it yourself. Write quick for catalog and plans JAHANT CO. Etits Akron, Ohio New DIESEL Engines! DON’T WAIT! Diesel Power Is the big, n | - tunities and blgger pay. GET OUT OF TH men BE AN EXPE PERT DIESEL ENGINEER and advance with this great new dnt S ls sweeping the world. LEARN DIESELS in eur big, nationally recommended DIESEL Schools and Shops. The ori , exclusive DIESEL Schools of the United States and Canada . . . established many years and always &head in training and equipment, More engines... more successful graduates... more Big Pay Jobs. Send for your FREE copy of “Diesel News,’ containing ups to-the-minute information about the amazing opportunities every- where for trained DIESEL men, HEMPHILL DIESEL ENGINEERING SCHOOLS, INC. 2120 San Fernando Road, Los Angeles, Calif. 1253 Diversey Parkway, Chicago, tll, 509 Westlake N., Seattle, Wash. 1365 Granville St., Vancouver, B. C. Nation-wide Employment Service is Free to all Hemphill Graduates You can build this Traller with ordinary tools easily from our step-by-step constructional sheets and large sized blueprints. Finest designed Trailer in existence, sleeps 4, Toilet, Shower, Elec- tr . Save 75% ol the cost by building it yourself. Send 25e for plana sheet, illustrations and details. THE PLAN SHOP $02 Palmolive Bldg. Book K Ezpleins ATI Practical School Courses—Day and Night. Book H Explains Home- Study Combination Course, Chicago, Ifl. ‘You can learn al) the modern dances—the latest Tango steps, the new Fox Trots, dreamy Waltzes, dẹ &mart Collegiate Btepa, a and popular Society Steps at home. easily and quickly. New chart method makes dancing as slmple as A-B-C. No music z or partner required, Don't be & wallflower. ern to dance.Complete course-256 pages, 64 Ulnetrationa ent on 5 Days’ Free Ins. Sas portage un money. fy jue postage upon grim oney back i E53 delighted. Ca We pay the world's highest prices for old coins, en- cased postage stamps and paper money. Large Copper Cents up to $2000.00 each, Half Cents $250.00, Indian Head Cents $50.00, 1909 Cent $10.00, Half Dimes $150.00, 25c before 1873 $300.00, 50c before 1879 $750.00, Silver Dol- lars before 1874 $2500.00, Gold Dollars $1000.00, Trade dollars $250.00, 1822 $5.00 Gold Piece $5000.00, Old Paper Money $26.00, Encased postage stamps $12.00, Cer- tain Foreign Coins $150.00 etc. Don’t Wait! Send Dime Today for our lars. Oman? list. MANO’S COIN SHOP Springfield, Mass. ALEE L TETN TTET Dent omi trn NOW FIX ANY MAKE OF BOOKS ALL SHIPPED FREE on approval; whether you want to qualify as garage owner, auto ve- pair expert or merely wish to know how to keep your own car 100% efficient, look at these books—they are sent to you for free examina- tlon. This brand new edition ha» been prepared by & large group of America's greatest automotive engi- neers. Anybody who ean read will understand them, for this great auto- mobile encyclopedia is a veritable Take advantage of this offer now; send in You don't pay us a penny, you gold mine of valuable facts. the Coupon for FREE examination. don't obligate yourself to pay any- thing unless you decide to keep the books. Just tell us you want to see them and the full set of 6 great vol- umes, just off the press, will be sent to you! Read them, look them over and prove to your own satisfaction that one fact alone, which you will find in them, may save you nn ex- pensive repair, or help you lo a 1935 Edition Imagine books which are so new that every page is right up to date— wiring diagrams, construction details, service problems—are all right up to the minute. Nowhere else can you get as complete and timely information. Over ù million dollars of resources have enabled us io give you the most authoritative books on the subject ever published. Everybody interested in automobiles in any way willl weleome these books published by the world's largest publishers of Technical Cyelo- pedias (est. 1897) with agencies all over the world. Can You Fix It? Can you take out “play” in differ- ential? Can you kill the “shimmy” in steering? Can you reset TIM- ING? Can you put your finger an engine trouble without guessing or ünkering? Can you pull the starter off and fix 1t? Can you adjust and repair transmission, engine, rear axle, bearings? These Books Tell How and tell you bow to do any and every auto job right, the first time. 6 Big Volumes Nearly 3,000 pages, over 2,000 illustrations, wiring diagrams, equip- ment charts, ete. De Luse edition with gold-stamped flexible bindings. Sent FREE for 10 days’ use. If not wanted return express collect, 1f kept, send only $2.00 after 10 days, then $3.00 2 month until special advertising price, $24.80, 1s pald. A Year's Consulting Membership FREE! Privilege of consulting engineers of million-dollar American Techni- cal Society on any automotive problem for one year without charge if you mati coupon immediately. American Technical Society, Drexel Ave. at 56th St, Dept. A4320, Chicago, Ill. END NO MONE A American Technical Soctety, Drexel Ave. at 58th St., Dept. A4320, Chicago, tllinols, I would like to see the brand new 6-volume edltion of your auto- mobile books but without any obligation to buy. I will pay the few cents delivery charges only and will examine the books and return them at your expense in 10 days unless I lke them, in which case I will send you $2.00 then and only $3.00 per month untill the special price of only $24.80 is paid. You are to include free, consulting membership certificate jn ihe American Technieal Soclely. Send 1933 edition. Street I City ... Employer’s Namo a Employer's Address 2.1.0.2... .. cscs eveceeere PEPEES E Please give us, in addition, the name and address of one business man as reference. ] a Thank You for Mentioning Modera Mechanix and Inventions for April When Writing to Advertisers 25

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Batteries Tires Auto tops Running boards Gaskets Floor mats Pedal pads of all kin Husking gloves Fe CLOTHING Galoshea Stops rattles Seat covers FARM USES arnes Belting, Leake CR AES ete. I'll Pay YOU for New Accepted Uses for So-Lo PLASTIC RUBBER 3 Look! $1.00 to $10.00 cash may be yours ABSO- LUTELY FREE for sug- gesting a new way to save money with So-Lol Over 5,000,000 men and women now use So-Lo to fix shoes at home. So-Lo saves money in many other ways. But there are hun- dreds of NEW uses. How do YOU save money with So-Lo? Think up a new way! Write your sugges- tion on the back of a So-Lo can label, and mail it to me. That's all. Send no money. You may get $1.00 to $10.00 cash. Spreads like Butter So-Lo mends the sole or builds the heel on your old shoes for only 1c a repair. Also mends auto tires, holes in auto tops, boots, hot water bottles, hose, etc. Easy—just spread on with a HANDLES an old knife like butter on guste g bread. A child can do a Te: nle racketa perfect job quickly. Dries Tesclatitg tools tough and smooth over- of all kinds, ete night. Waterproof, acid- de proof, flexible. Outwears rubber or leather. One can will save you as much as $25.00. Not a Contest Everybody Wins | A surprise free prize will be sent to everyone who tries, as soon as your Sug- gestion reaches us. This valuable, useful gift is EXTRA and IN ADDI. TION to the CASH AWARDS. Every entry gets a free prize! Send your suggestion today. Act at once! : Get So-Lo today! Try it! Save money with it! You will easily think up many uses. Tear out this ad and take to any hardware or 5 and 10c store. Then send your suggestion on the back of a So-Lo can label and you may win $1.00 to $10.00 cash. Act now. Made and guaranteed by SO-LO WORKS Dept. MM2, Cincinnati, O. RUBBER GOODS Gym shoes Atomizer bulba Rubber mats Syphons "Toys Rubber boots Ete, AT HOME Furniture _ Rug-non-skid Linoleum Washers pui tresde oor etoppers Etc. 28 BUILD A FRONT DRIVE! You can now build your own midget front drive &uto, for racing or sport use, with the simplest drive, using “T” Ford parts and few tools. With the plans now avail- able, this 4 wheel brake, front drive, can be built at home, using your motorcycle motor and other car parts. Made without the extensive machine work found in carsof thistype,this ''Sil- ver Bullet" can be built by almost anyone and most economically. E. A. BORNTRAEGER 3450 NO. MARSHFIELD AVE. CHICAGO, ILL. Send stamps for further details, Learn Public Speaking At home—in spare timo—20 minutes a day. Overcome ‘‘stage-fright,’’ gain self-confidence, increas your salary, thro! ability to sway others effectiva speech. Write now for free booklet, How to 'onders With Worda NORTH AMERICAN INSTITUTE, Dept» 2054 « 3601 Michigan Avenue Chicago, Nunote ork tion—sells on *'flash'' demonstration. Main = or side line, part or full time, Opens big, new market. ~ WREITE--get established for exclusive territory. Hurry! HAN [-EE GRINDER 72 ze TE inany light socket and do 1001 jobs. Do , away with slow hand works / Grinds, routs, drills, carves, sharpens, cuts, engraves, For shop, home or tool kit. (Model A), A. C. or D. C, & operation, 110v., 13,- 000 r.p.m. Order on 5 day ele! poli fac fen grave, etc, Prepaid $5.00. guaran- C4ICAGO WHEEL & MFG.CO. Jteed. 106 ^. Aberdeen St., Chicago, lil, Ordertoday. NEW OPPORTUNITY IN ACCOUNTING —and how you can take advantage of it Never before, has there been as great DOC an opportunity as now faces the ac- counting profession. Depression has taught executives the vital urgency of knowing all the facts about their business. Then our new governmen- tal policy forces the keeping of bet- ter and more complete records in every office and plant. It is not a matter of choice—it is necessity. Authorities tell us the demand for com- petent accountants will probably soon ex- ceed the supply, This spells real oppor- tunlty—for those already in accounting, and for capable men who will start training imme- diately. The man who is wise will Investigate promptly —he will write for tree booklet and full information. LA SALLE EXTENSION UNIVERSITY The Institution That Has Trained Over 1,200 C. P. A's Dept. 4493-H CHICAGO Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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like EVEREADY FLASHLIGHT BATTERIES? Because Why is a newly-painted fence B | both have l] "signs" — 4 A | to show THEY'RE FRESHI INGIS NEA MOLRXH OF. * 2 *3 HOJ29 » SLTA. SEEI AON F | | | il BE A POULTRY EXPERT " Make $40, $50, $60 a Week To Plate Auto Parts, Reflectors, pathroom Fix- Tree book shows how to get started quickly. You']l be surprised at tures, Refinish Beds, Mirrors, Chandeliers, by new the amazing profit opportunities in the poultry business. Wherever you method; no capital or experience required. Simp e plan live—whatever you do—it is easy to start on a spare or full time basis. of manufacturing at home starts you in big money Free book tells all. Send for “How to Raise Poultry for Profit.” ‘You making business. Outfit furnished. Free particulars learn right at home in spare time by methods endorsed by colleges and and proofs. leading poultrymen. Know how to get the maximum profits from in- P teresting, neathy. work. Iron ad aerermenr protects you. We bay -| prepared hundreds for good jobs and businesses of their own rite GUNMETAL CO. Ave. P Decatur, n. now for free book. No obligation. National Poultry Institute, Inc., Dept. 134, Adams Center, N. Y. The new and revised edition of “Auto Power’’ with all the ten original specifica- tions und ten new ones is now off the press. Convert old generators into A. C. and D. €. generators and motors with voltages of 6 to 400 volts, for power, Hight, weld- ing, and radio operation. Create new generators adaptable for home, automobiles, or trucks. They can be driven by fan belt, wind or water. This book, with com- plete illustrations, tells you how easily and economically these changes ean be made. Also instructions for rewinding auto armatures. 350 definitions of elec- trleal terms, ete, Already used and endorsed by thousands. Only $1.00 postpaid. AUTO POWER Dept. A 412 S. Hoyne Ave, Chicago Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 29

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NE TOUCH A BUTTON ! LIGHTED CIGARETTES COME OUT OF MAGIC CASE MAGINE this! You take a beautiful case from your vest . pocket! Automatically a cigarette and a flame appear. You puff... and a LIGHTED, ready-to-smoke cigarette is delivered right between your lips. Smokers crowd ‘round when you use it. . . they gaze in wonder . . . everyone of them wants a Magic Case. Just use a Magic Case half a dozen times a day and you will et a money-making thrill such as you never had before. You can hand out Magic Cases almost as fast as you can take in the money. Make up to $16 a Day! You never saw anything like the Magic Case before in your life. It's got Novelty, Practical Utility, Universal Demand. Let me send one to you for 15 days’ trial at my risk. Just use it... show it... watch smokers reach for it... eager to buy, Agents are coining money fast. You can, too. Write quick, MAGIC CASE MFRS., Dept. D-3549 4234 Cozens Ave. ST. LOUIS, MO. Trained men needed, Demand for Avto- Diesel experts to service and operaie trucks, tractors, trains, buats, airplanes, ower shovels, etc.. grows every month. 'o qualify for good jobs, you muat first become trained. This can be done ina jew months at National. Qualifies you as Auto Mechanic, Auto Electrician, Bat- tery Expert, Carburetor Expert, Diesel Mechanic, Diesel Service Man, Fuel In- section Expert, Trouble Shooter, eic. Oldest, Largest Trade School In West Est, 1905. 39,000 graduates. Finest *quipment—late model autos and Diesel angines to work on. Expert instructors. Earn Room and Board We assist studenta to obtain part tima Job during training. We allow coach railroad fare from any part of U.S. to dos Angeles. SEND COUPON FOR FREE AUTO-DIESEL BOOK Dept. 4.MMA, 4006 South Figueroa St. Send Free Auto-Diesel Book and Special offer. Address City 30 Thank You for Mentioning Modern Mechanix and Inventions for April M XM AC AN 4 Inches of Muscle Put On Your Arms . o o Of We Will refund your money The German Iron Shoe Muscle Builder is the greatest exerciser made to bulld glant-like arms, wide powerful shoulders, brawny back and tre- mendous chest. ‘‘It cannot be equaled,’’ says William Raymond, America’s strongest armod man, John Filepone added 5 inches to his arms. E. Peters 1 inch on each bicep the first week, 60 Day Course Included FREE! The iron Man's famous illustrated course with numer- ous exercis^s included FREE! At no extra cost we will equip the famous Iron Shoe with our new Steel Chain Strength Resistor and Strength Register. The greatest ——— ————À offer yet! Thousands are using this LL | marvelous strength builder, It ia the GET A choice of the champions. NOW ring in on the spoclal offer and GOLD get the lowest priced and bigs est roe gult-getting exerciser under a Bun. MEDAL Special rizos i iven EREEI, Send for ree Information. o obliga . AWARD! Write name and address in margin and rush te— AMERICAN ATHLETIC APPLIANCE CO. 4324 Paul St., Dept. 164, Philadelphia, Pa. When Writing to Advertisers

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Half a Million People have learned music this easy way You, too, Can Learn to Play Your Fav- orite Instrument Without a Teacher Fasy as A-B-C M^A5Y of this half million didn't know one note from another—yet in half the usual time they learned to play their favorite instrument. Best of all they found learning music amazingly easy, No monotonous hours of exercise—no tedious scales—no expensive teachers. This simplified method, perfected by the U. S. School of Music, made learning music as easy as A-B-C, M ul dT p From the very start you are playing veal tunes perfectly, pee cane These eeplain by note. Every step, from beginning to end, Is right before our newly perfected method fully your eyes in print and picture. First you are ‘told how to do 2 and show you how easily and quickly thing, then a picture shows you how, then you do it yourself you can learn ta play at little expense. and hear it. And almost before you know it, you are playing your U. S. School of Music, 2624 Brunswick favorite pieces—jazz, ballads, classics. No private teacher could Bldg., New York City. make it clearer. The cost is surprisingly low—averaging only a few OT TITIETTTTTTTTTLTTTTTTTTTTTTTSTM cents a day—and the price is the same for whatever instrument you : choose, V. S. School of Music, Learn how to play your favorile 2624 Brunswick Bldg., New York City Instrument and. surprise A anus Send me your amazing free book, “How You Can Master Musto LEARN TO PLAY to the center of attraction. Musi- in Your Own Home," with inspiring message by Dr. Frank Crane; BY NOTE clans are invited everywhere. Enjoy ao Frae Demonstration Lesson. This does mot put me under any Piano Violin the popularity you have been missing. s S Gultar Ukulele Start nowl Fe Organ Saxophone Ae. siete EENEN drs ER I E VES RR ERR RS re Ra a Cake lien Rape RA aan ener Ban o Free Booklet and Hawallan Guitar i Piano Accordion Demonstration Lesson Address 2... ccc ccc EESAN ATAI A NN AA ETERA Or Any Other Instru- If you really do want to play ment your favorite instrument fill out Have you this and mall the coupon asking for our Instrument ,.......... vem ess liSstiTument?..... seus | ex) WANT A STEADY JOB. UNITED STATES MAIL RAILWAY POST OFFICE FRANKLIN INSTITUTE, Dept. N298, Rochester, N. Y, Tush to me entirely frec of charge (1) a full description of the MANY OTHER U. S. GOVERNMENT POSITIONS position checked below; (2) Free Copy of 32-page book, ''How to Get a U. S. Government Job’’; (3) A list of U. S. Government S T E A D Y W Q R K S Jobs; (4) Tell me how to get a Government Job. 9 O Rallway Postal Clerk............ 00 ccc e eee (Start $1900 year) Hanae mm 7 1 al arrier.... we | MEN—BOYS 18 TO 50 Y = H Office Clerk—File Clerk. Start 1260 year) @ Kap uineis Lat 2100 year mmigrant inspector ..... we Short Hours Pleasant Work S Ci Liquor OGauger- Storekeeper Are BARN PECUNIAE NHNUNT (Start 2000 year) Rapid Advancement, Permanent Employment — MANY SPRING EXAMINATIONS E MD TUE detent EXPECTED / MAIL COUPON TODAY. TOMORROW / = Address ....ceeeeee I eese sse Vive pd dimi 2d YOU MAY FORGET P Use This Coupon Before You Mislay It Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 31

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Above—Allan Lockheed, designer of ` Lindbergh's "Tingmissartoq," of the monoplane with which Amelia Ear- hart conquered the Pacific, of Wiley Posts "Winnie Mae,” and other famous planes, is also the author of this comprehensive article on build- ing stratosphere air-liners. Right— The Lockheed “Scout,” designed 16 years ago, compares favorably with planes of later development—testi- mony to the fact that. the future in aviation can be predicted today with reasonable accuracy. e stream- lined principles of the "Scout" will be further developed in strato-planes. ALLAN LOCKHEED Supplies the nation’s premier flyers—Lindbergh, Earhart, Hawks, Post, Wilkins—with Lockheed planes for their record feats. This pioneer of early aviation, now active on design work for air transports of the immediate future, contributed many of the ships that today are burning up com- mercial airline schedules and cutting air mail time in half. Consequently the words of Allan Lockheed, today one of the outstanding individ- ual technicians of aviation, are of more than usual significance when he deals with the prob- lems of flying airplanes in the stratosphere. His story follows: HY fly in the stratosphere? Simply because there’s a free 200 mile an hour boost up there that aeronautical en- gineers want to take advantage of. If one could plan a railway that would run down hill all the way from coast to coast, think of the transcontinental speeds he could attain. Flying in the stratosphere is not as simple as building a downhill railway, but it is a sub- ject which has intrigued airplane designers for a long time. Much data has been accu- mulated about it. Many rumors have seeped through the daily press about the wonderful 32 ALLAN LOCKHEED Noted Plane Designer . - This article on the strato-plane of the "future tells how huge double-decked planes will speed through the rarefied air from coast to coast in six hours. trans-oceanic speeds we are going to get. All that is in the offing. Right this minute, however, enough mate- rial has been accumulated through pioneer experiments and flights to turn the minds of those of us who are engaged in the business of developing airplanes toward the possibility of building a stratosphere plane today. Under existing conditions, with existing materials, we plan to double our present speed by the simple expedient of welding this 200 mile an hour stratosphere boost to our cause. Up in the stratosphere—that layer of air between 50,000 and 75,000 feet altitude—there are steady winds that blow from West to East, opposite the direction of the earth's rotation. By these winds alone we can gain a measurea- ble increase in our overland speed. But there is another factor. As we ascend, the density of the air becomes less and less. This even- tually diminishes to a point where we have gained the effect of reducing our fuselage and wing drag; which is the same as saying we have reduced our wing surface to the mini- Modern Mechanix and

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Above—A double-decked pas- senger plane following Lock- heed's design for stratosphere air-liners. Note the “in-line” type motors faired into the ' wings, the retractable landing gears, and the wings set in the middle of ship. Right—At work on the Jimmy Martin strato-plane at Bucks, England. The plane may be completely taken apart for shipping. The motor was built at a cost of $200,000, and attains a speed of about 400 miles per hour. mum. Atthe same time, through supercharg- ing or forcing air into the carburetor to increase performance, we have maintained our motor power output. The result is natu- rally a big jump in speed. The only justification for stratosphere flight is velocity. If two points are so close to- gether that an airplane could reach one point from another in less time than it would take to climb into the stratosphere, go the distance and descend, there will be no need for strato- sphere lines. But the coast-to-coast route is a logical objective! Volume of traffic in pay- ing quantities and the great time to be saved create a demand for such service. Since the eastern trip will take about 6 hours under top conditions, probably the air- line men will loaf from Los Angeles to New York, taking 8 hours. Then by speeding the ship up against headwinds, they can maintain the same schedule going west to the coast. Inventions, April, 1935 Here it will be a matter of psychology in bal- ancing publie feeling so that the traffic will be as heavy one way as the other. But Im getting a bit ahead of myself. I talk just as though the stratosphere airliner were an accomplished fact. To me it is— I've carried all the probabilities around in my mind's eye until I can recite them backwards. Cleopatra could have had an automobile, you know. At that time all the materials existed which were necessary for the construction of the car. We can have a stratosphere plane if we want it; and we know how to build it and what it will look like. I'll tell you what the plane will look like, and why it will be constructed the way it will. Confidence in this prediction is based on the fact that my early ideas have stood the test of time. Some of the designs I did ten and twelve years ago, radical at the time, can 33

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"In Line" Type Safety Motors Will Feature New Stratosphere Planes Above—The Lockheed Alcor, successful test plane built to gain experience with “in-line” motors in new safety twin installations. 289 Above right——A side view of » the “in-line” motor, with the pan removed to show easy accessibility for repairs. This type motor will be used in all future Lockheed airplanes. The motors of the new Lockheed plane are so close together that the failure of one would not cause pilot to lose control. Above—A front view of the Alcor’s motors showing how they afford better vision for the pilot while making a landing. 34 now hold their own with ships of conventional 1934 design. Working closely with aviation problems, things I have seen at an early date have later come to pass with considerable accuracy. In 1918 I designed the Scout. The little Scout had a monocoque fuselage, streamlined to perfection. Today, 16 years later, the Scout would hold its own though stacked up against a modern ship on any tarmac. In 1926 I organized the Lockheed Aircraft Corporation. The fuselage construction used in the Scout—the plywood monocoque—was improved upon in detail but not in principle, and we commenced manufacture of the Lock- heed Vega. This ship did big things. It was aerody- namically clean, a fact which can be attributed to the idea of building the plywood fuselage [Continued on page 140] Modern Mechanix and

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Knock Down Monuments With Feathers Nic Sprank in ODDITIES of Science pr F LYING BIRDS DO NOT BREATHE! — 77e action pi forces afr ito szali cs Lelween He muscles which relay rhe ur To the lungs through sume canals. Birds breathe normaly only wher gliding £ Sack Ward, Chicago, M. DB LUMINUM IS HEAVIER THAN CONCRETE! —According fo governinell mem aluminum WERE Le AR ree aee NN BILE WASHINGTON MONUMENT COULD BE KNOCKED OVER WITH THAN ROPE! Flame can : AFEATHER! — set into a vacuum and hit with a feather, De casco smote qp xw the Washington monument would snay slightly. Listruck See! rope charsiororm ENIM repeatedly on the completion of each swing it would a crust Which Slows. DIAA f soon Topple to the erouzd.— progress H hankin fue Ma M UAE Benard J Rubenstein, Roxbury, Mass. Win $1! Send your Oddity of Science to Nic Sprank, Modern Mechanix and Inventions, 529 South 7th Street, Minneapolis. Source or proof of each oddity must be given. Send all oddities separately, not with other manuscripts or letters. Inventions, April, 1935 à 35

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Scientists Invent Machine To Discover How Brain Works Left—A headpiece containing silver electrodes is clamped on the patient's head to pick up the brain's electrical currents. Right—The inventors of the machine watch the action of the amplified "action current" as it flows swiftly across the disc. S v Device Measures Musical Talent The automatic tone variator (above) has 14 tuning-forks, each delicately tuned to one-quarter of a tone from the other. YARDSTICK for the measurement of musical talent, an automatic tone- variator, is now being used at Northwestern University to determine students' ability to determine exact tonal pitch. The machine contains 14 tuning-forks, set within one-quarter tone of each other. Two -notes are struck in quick succession, and the students are asked which note was higher. Those that can detect the higher note con- sistently are keenly encouraged to study musie. They are considered to be musically apt and talented. Students with less sensitivity to tone are advised to study instruments with broader tone distinctions such as pianos and other keyboard instruments. 36 HE brain, perhaps the most mystifying organ of the human body, can now be scientifically studied by a new apparatus which photographs amplified “action cur- rents. Invented by Dr. H. H. Jasper and Dr. L. Carmichael of Brown University, the new machine will permit physicians to study the action of the brain just as the electro- cardiograph permits a revealing study of heart action. A headpiece on the head of the patient picks up electric currents of about one ten-mil- lionths of a volt which flow from the brain in waves, at a rate of from eight to fifty per second. The currents are carried to an ampli- fying box where they are intensified 500,000 times and flashed across a glass disc. The ordinary currents are smooth and wavy; when the mind is disturbed, they are sharp and irregular. Tiny Gauge Tests Compression NEW tiny compression gauge is set onto a steel tube threaded to fit into spark plug holes. It will quickly. measure the exact com- pression of a faulty cylinder as the piston moves to the top. Tiny pressure gauge is threaded to fit into any spark plug hole. ` Modern Mechanix and.

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Instrument Measures Heat RECORDING DRUM ations. N INSTRUMENT that will measure the heat of the sun's rays even on cloudy days reported by government weather bureaus as being sunless, has been invented by Professor L. F. Miller, University To gain these accurate . of Minnesota physicist. measurements, two vacuum bulbs are set up ` on the roof of the Minnesota physics building. The bulbs are connected by a thermo-couple. Falling on the bare filament of one bulb, the light makes no impression; the other bulb is made of quartz and quickly absorbs heat. The difference in temperature between the two bulbs is recorded on a sensitive galvanometer which governs a light beam to record the fluctuations on a drum. This extremely accurate measure of the percentage of sunlight is expected to greatly advance the study of vital rays cast off by the sun. It will also provide perfect recordings for Weather Bureau records. Outlet Plug Pierces Through Rug O MAKE electrical connections through a rug without damag- new type plug has been devised. The plug is set ; onto screws which pass through the rug without tearing. To help locate the terminal block, two pointed dowels extend upward through the rug. The plug is set on these points. Plug sets on pointed dowels set through rug. Inventions, April, 1935 Left—Professor Miller examines photographic recording of heat fluctu- Heat is registered on two evacuated bulbs shown on right. ing the fabric, a | of Sun Rays EVACUATED BULBS Tubes Replace Strings In Piano NEW piano which uses alloy tubes in- stead of the conventional steel strings will resist any sort of pounding without los- ing tune, according to the claims made by H. E. Noake, Los Angeles inventor. As a test of his idea, Noake has had a four octave piano of this type built. It operates from a standard keyboard and produces 49 notes. The metal tubes are suspended in the place of the strings and are sounded by felt ham- mers controlled by pressure on the keys. Miss Vivian Brandt is shown above as she plays the new chime piano. The piano strings have been replaced by alloy tubes. 37

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American RAILROADS This giant oil-burning locomotive has made Northwesterh railroad's new train, The 400, the fastest in the country. large, heavily-weighted drive wheels. editas eoe Note the The 400 hit a top speed of 91 m.p.h. on its first trip and made 81 miles in 67 minutes on the Chicago-Minneapolis run. Boiler pressure was increased on locomotive and oil fuel used to eliminate coaling stops. ` HREATENED by the increasing competi- tion of air lines and busses, the nation's railroads are whittling time schedules, smash- ing speed records to maintain their position at the top of transportation systems. First established train to set up a new mark was The 400, fastest scheduled train on the American continent. Curiously, The 400 is not streamlined, lightweight, or Diesel- electric, but a conventional, oil-burning iron horse. Pride of the Chicago & Northwestern railroad, it speeds over the 410 miles of re- ballasted roadbed between Chicago and St. Paul with standard coaches in 420 minutes, one hour, twelve minutes faster than old schedules. Its average speed of 58.8 miles an hour is faster than Twentieth Century’s 54.1 m.p.h. . or the Burlington’s Diesel-electric Zephyr’s This latest streamlined train will run in New England. The Flying Yankee did better than 100 m.p.h. on a test run. 38 49.5 m.p.h. The new, oil-burning locomotive of The 400.features larger drive wheels, 79 inches in diameter compared to 75 inches on . similar Northwestern locomotives. As a re- sult The 400 makes the run between Chicago and the Twin Cities with 5,557 less revolu- tions of its drive wheels. That run between Chicago and St. Paul and Minneapolis is the scene of a speed duel be- tween three railroads, the Northwestern, the Chicago, Burlington & Quincy R. R., and the Chicago, Milwaukee, St. Paul & Pacific R. R. First to meet the challenge of The 400 was the Burlington with two streamline trains similar to the Zephyr, which is now employed on a © scheduled run between Kansas City and Omaha. These new, 3-car Diesel-electric units will clip at least 30 minutes off the seven and a half-hour schedule of The 400, accord- ing to plans. The Milwaukee will also speed up its schedule with two new streamlined oil-burn- ing engines pulling streamlined coaches. They are expected to have a top speed of approxi- mately 100 miles an. hour. i Throughout the country similar speed races are in the offing. Union Pacific has inaugu- rated a 31$ hour schedule over the 187 miles between Kansas City, Mo., and Salina, Kan., with its three-car streamlined M-10000. The time reduced old schedules by one-third. Santa Fe must meet this increased speed on the 67 miles from Topeka to Kansas City, which M-10000 makes in 72 minutes, Santa Modern Mechanix and

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Challenge SPEED Records The Burlington railroad’s Zephyr can reach a top speed of 120 m.p.h. Two similar streamlined trains are expected to reduce The 400's time on the Minneapolis-Chicago run. Fe, it is said, plans to reduce this time by two . minutes. This western speed battle probably will extend to the Pacific coast this summer when the Union Pacific puts longer streamline trains in operation. The U. P. hopes to cut the present 54144-hour schedule between Chicago and the coast to about 354% hours. Winton Engine Corp, a division of General Motors, is building a new double unit Diesel locomotive for Santa Fe. The new locomotive can be driven from either end, will be powered with four 900-horsepower engines, ‘and will have a top speed of more than 100 m:p.h. With the new locomotive Santa Fe’s crack train, the Chief, is expected to make the 2,364 miles between Chicago and Los Angeles in 40 hours, instead of the present 55 hours. In the East new streamlined electric engines of the Pennsylvania Railroad are cutting schedules between New York and Washing- ton. Competing with the Pennsylvania, the Reading railroad has built a coal-burning, partly streamlined, steam locomotive that clipped off 90 miles in 88 minutes. ‘A new, streamlined, all-steel passenger train has been built for the Boston & Maine and Maine Central railroad. It attained a speed of more than 100 m.p-h. on a test run between Trenton, N. J., and Philadelphia, Pa. ‘Inventions, April, 1935 by JAMES DYSON This Union Pacific streamlined train broke the trans-conti- nental record. U. P. now plans to increase its new trains to 11 cars pulled by two Diesel engines of 1,200 and 900 h. p. respectively. The record breaking train above has three cars. This coach will be used on the Milwaukee's new streamlined trains between Chicago and Minneapolis. New oil-burning streamlined engines will have a top speed of 100 m. p.h. "Badger tail car above will be used on rear of new train. 39

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600-Passenger Plane of Future to Use Underground Airport Left—Dr. W. W. Christmas is holding a model of his 600- passenger plane. Right—Cross-section of proposed airport. Defense Gun Hurls Balls of Fire A GUN which shoots eight streaking balls of fire in rapid succession is now being tested as a possible anti-aircraft gun to set fire to enemy planes during wartime. The gun is built on a “Roman Candle" : principle, each ball being separately ignited from a battery as the trigger is pulled. A metal funnel on the end protects the operator from flying embers cast -by the imperfect powder balls now being used. Photo shows a police i officer demonstrating the fire-ball gun. An electric battery ignites the powder when the trigger is pulled to send the fiery balls flaring through the sky. The funnel guards user from dangerous | flying sparks. TURNTABLE OOKING into the future and visualizing the fact that aviation will handle a great bulk of the world’s transporation, Dr. Wil- liam Christmas, noted inventor-aviator, has designed a new 600-passenger air-liner and a giant underground airport to service the planes and handle the passengers. The 600-passenger liners will be built with a two-story fuselage and will have an over-all wing spread of 400 feet. Motors of 25,000 horsepower will drive 75-foot propellers at a rate which will carry the planes at a speed of 200 miles per hour. Amphibious and carrying. all the luxuries of a modern steamship, the plane is expected to be too large to be affected by adverse weather conditions. The airport will house a United States post office, hangars, and service rooms for the planes. Landing on the wide, curved roof, the planes will trundle down a ramp onto a turn- table where they will be swung directly in front of the post office to discharge passengers. Elevators then carry the passengers to under- ground automobile and railroad lanes where they may continue their journey. Bombard Nitrogen to Get Oxygen HE dreams of the old alchemists to build heavy elements out of lighter ones has | been realized by Dr. W. D. Harkins, Univer- sity of Chicago scientist, who recently made oxygen by bombarding nitrogen, a lighter gas, with the neutrons of atoms. Modern Mechanix and

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Pneumatic atthe: Shoot . In Berlin’s gigantic central kitchen food is cooked in huge kettles like those in above photo, then placed in thermos jugs, set into cor- 'rugated paper containers, and forced through pneu- matic tube by compressed air to kitchens in vicinity. Coffee, soups, and other drinks are drawn from huge tanks through faucets; en- trees, meat dishes, salads, and desserts are packed into thermos jugs by hand or by automatic machinery. Menu is 300-page book. HIZZING at mile-a-minute speed through pneumatic tubes far beneath the streets of Berlin, Germany, are thermos bottles each containing part of some house- wife’s meal. A phone call is enough to bring, in less than fifteen minutes, a complete meal ready to serve, containing exactly the desired quantity and kind of food for each course. Housewives select their meals from a 300- page menu book distributed to tenants in every apartment house and home within a radius of ten blocks of the gigantic central kitchen. Orders may be placed by phone for delivery at any specified time. In the kitchen food is prepared in huge . galvanized troughs and pots. Long rows of thermos bottles are stacked in readiness to Inventions, April, 1935 Ha Meals To H omes Complete meal is de- livered via pneumatic tubes fifteen minutes after order has been placed by phone, to Berlin homes near new food center. Right: Housewife holds one of thermos jugs used in delivering m eals. Loaded thermos jugs are slipped into these pneumatic tubes at food kitchen, for delivery to homes. Separate pipe runs from kitchen to each home getting service. Compressed air. pushes containers at high speed through the smooth tubes. receive dishes ready for delivery. The bot- tles are wrapped in corrugated containers in preparation for their trip through the vast network of underground tubes. . Newer homes in Berlin will have no kitch- ens—simply a few pneumatic tube outlets beside the kitchen cabinet or sink. With the elimination of all stoves and ovens in. the home, the fame of German women for tasty cooking may soon pass into obscurity. 41

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ROBERT L. FREY Executive Assistant United Press Associations EWS travels fast. It circles the globe like lightning while historic events are still in the making. The world was reading the tragic details of the Morro Castle disaster while her pas- sengers were still leaping from the burning - decks of the doomed Ward Liner into the. -- storm-swept waters of the Atlantic. Less than 20 minutes after first radio oper- ator Rogers sent his SOS from the Morro Castle, the tragic story was flashed over Reader buys the "extra" from newsboy without realizing how fast news is gathered.. Linotype operators (right) hur- tiedly ope the edited news in ‘metal which is fitted into page forms for the presses (center). Papers then slide into news trucks (left) ready for delivery. —Á 42 Modern Mechanix and

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Mo Flash 2 | NEW YORK--RCA PICKS UP SOS FROM PASSENGER LINER MORRO CASTLE UPA NX RM4&42A A section of the New York bureau of the United Press, nerve center of the association. Men at left are operators sending news over wires. Arrow shows sending tape. Man at long table in center is filing editor who decides which stories shall move first. In background center are copy editors. At n: at typewriter is rewrite man. PRYEPOONS April, 1935 At 4:23 a. m. Morro Castle radio operator sent SOS. While PRGA were leaping into sea (arrows in top photo), U. P. at 4:42 a. m. sent flash, then bulletin, then add” (on opposite page) exactly as reproduced here for extra papers. United Press leased wires into newspaper offices from coast to coast. Cables carried it to Europe, South America and the Orient. Rogers’ signal was sent at 4:23 a.m. Picked up by the marine radio division of the Radio Corporation of America, it was relayed by telephone to the United Press. Amid the rattling battery of automatic telegraph printers in the New York office, the night editor took the message. He jumped from the telephone, shouted “Flash.” Instantly a deathly silence swept the room. Loudly but clearly he shouted the sentence to the waiting telegraph printer operators that would mean extra editions and streamer headlines to newspapers throughout the world: FLASH NEW YORK — RCA PICKS UP SOS FROM PASSENGER LINER MORRO CASTLE UPA NX RM442A The message completed, each operator rang n

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Bureaus FLASH Photos the bell on his machine ten times. On every. receiving machine in newspapers throughout the land a similar bell rang ten times. Again silence while the night editor hurriedly wrote the three line bulletin subflash of the first story of the disaster. While he was still wiiting his assistant had grabbed hat and coat and quickly left for Asbury Park, N. J., where the flaming vessel had been sighted eight miles off shore. Be- tween snatches of the story relayed by tele- phone from R. C. A., the editor put through hurried phone calls, aroused United Press editors, reporters, and correspondents and ordered them to stations along the New Jersey coast to pick up every smattering of > the story possible. Reporters phoned New York from a dozen points—calling in disconnected details of the tragedy, stories from the survivors, condition Reporters writing running story of Bruno Hauptmann (arrow } CAT Murder trial A A to mesenger payer vbo rush of rescued passengers and crew, rescues by to telegraph operators (below) in another room. ey sen : f it in Morse code to New York for the press association wires. the Coast Guard and Jersey fishermen. Re- i porters went to sea, flew in planes, inter- viewed every one who had the slightest in- Above automatic telegraph typewriter both sends and receives. As sending machine it ‘punches out tape which passes through trans- mitter to send electric impulses over wires. UNITED PRESS ASSOCIATIONS, NEW YORK. + Each vertical line of dots in sending tape below is a character, space or punctuation . mark. Sent through machine, receiving news- paper would see typed words shown above. e e e eee [IEEE EO *999900000909000000090€ e 44 Modern Mechanix and

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Across U. S. by Wire | | = formation about the tragedy, patiently listed every rescue and death to bring to the world the tragic story of fire at sea. The hastily assembled editors in the New York office of the United Press in turn gathered the disconnected ma- terial by telephone and telegraph and rewrote it into the coherent stories you read in your daily newspapers. That first flash of the disaster broke into ` the routine news that was being sent over the United Press wires. The operator in- stantly broke the smooth flow of the 60- words-a-minute sending tape, used for ordi- nary news, switched to the direct keyboard, and punched out the flash as fast as the editor dictated it. From.that time on the story of the Morro Castle disaster, fed to the operators in short "takes," took precedence over all other news. When Cornwallis surrendered at York- town, ending the Revolutionary War, it took 49 days for that news to reach England. To- day such news would "flash" over United Press wires reaching 1,252 newspapers in nearly every nation of the world within 10 minutes. Scanning headlines over their morning coffee, few newspaper readers are aware of the vast newsgathering network of telegraph . wires and cables, the thousands of correspon- dents, laboring 'round the world and 'round the clock to bring today's news to them today. Bruno Hauptmann testifies in the Lind- bergh kidnap-mur- der trial, a few min- utes later millions of newspaper readers know his answer to every question, A noted European ii D i NEWS . NEWS PHOTOS | / FLASHEDIOO00 MILES ENDING MOTOR To get photos in newspapers simultaneously with press asso- ciation stories, Associated Press has developed Wirephoto service to send pictures by wire. Photocell scans photo, sends impulses over wire to similar receiving machine which has light-valve that acts on sensitive negative, After being devel- oped, print is made and half-tone cut prepared for newspaper. death. The first flier to cross the Atlantic alone lands in Paris; within five minutes the news is in American newspaper offices and newsboys are crying "Extra!" 20 minutes later. : A press association is a world-wide news gathering agency.. It supplies your local paper with all the important news that “breaks” outside of your city. The press as- sociation serves hundreds of newspapers in many countries of the world, each paper pay- ing a fixed fee for the service, "The press association maintains key bu- reaus in important cities and capitals of the world which in turn control smaller bureaus [Continued on page 144] statesman dies; with- / - oo MEO i F $1 in ten minutes the | 7 . fi LECT A tA news has reached \nostiann | — į CENVER this. country and a $ BAN SRANCISCO few minutes later 2 \ bn i extras are on the street telling of his in 24 cities get photographs by wire. photos. Inventions, April, 1935 3 The wire route of AP's new Wirephoto service. Fifty newspapers While press association sends story of disaster, Wirephoto at same time can send actual Receiving and sending machines are located in each city. Service is controlled in same manner as a press association. © am se : EA CUR . cmY .45 ó e fo, YORK

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. German Racer Has Vanes to Deflect Rushing Air Currents Left—Photo shows the fin-like vanes on the rear of the new racer. Big Siren Throws Sound 10 Miles ARGE sirens that will send their staccato, coded warnings ten miles through the fog to warn approaching vessels, have been in- stalled as guarding signals on each pier of the world's largest bridge across the San Fran- cisco-Oakland Bay. The sirens are double-headed, and will throw sound at right angles to the bridge in both directions. Since the direction of the sound is set in this manner, navigators can tell their relative position to the piers by the in- ‘tensity of the pitch. When in direct alignment with the pier, the pitch is highest. The bells, marking secondary channels, and sirens, are controlled from sub-stations on each side of the bridge. The warning sirens shown in the photo have copper coverings to resist corro- sion. The siren mechan- ism is shown in fore- ground. It will throw sound about ten miles to warn navigators ap- proaching the bridge. Right—The racer in a test run. Note inclosed cab. . SUPER-RACER, with long areo- dynamic lines sweeping smoothly from a blunt nose to an arrow-shaped rear end, has been designed and built by German engineers. The car will attempt to break the existing world's land speed record now held by Sir Malcolm Campbell, British racing driver. Contrary to the customary design, the drivers seat is entirely enclosed and incor- porated into the body of the auto as a sloping turret. Wind foils behind the wheels and vanes in the rear deflect the rushing air cur- ` rents smoothly to prevent vacuum as the auto speeds forward. Ribbed Bolts Replace Hot Rivets OT rivets may be re- placed by a new ribbed rivet bolt for steel con- struction . work. When driven through the bolt hole and tight- ] : ened, the new bolt is said to form such a tight body-fit that it cannot be displaced. The neck of the bolt is ribbed and about one thirty- second of an inch larger than the hole into which it must be driven. New Tubes Change D. C. to A. C. LECTRICITY in the form of direct cur- rent can now be transmitted at high volt- ages and converted into alternating current at any place along the line where power of a lower voltage may be needed. This new method of transmission involves the use of giant thyraton and phanotron tubes. Such tubes and other necessary machinery will be placed in sub-stations along power lines. The ribbed bolts can be driven into a bolt hole with a heavy hammer. Modern Mechanix and

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Ghree-Mile ‘Bridge Spans BALTIC SEA 3.1 FEATURES OF .THE BALTIC SEA CANTILEVER BRIDGE Total length is over 3 miles. Con- nects Denmark to Funen Isle. Has five 2700-ft. water spans. Road- way is 100 ft. above water. Has one giant automobile highway and . two railroad tracks. —Five concrete arches are on land. Piers are over 250 feet high. Cantilever bridge method used. Spans part of the Baltic Sea 100 feet deep in places. by HANS F. KUTSCHBACH HREE miles of steel roadway. resting on five massive concrete piers, will soon carry the Flying Hamberger, Germany's crack passenger train, from the.continent to the Danish Isle of Funen, shortening the travel time between Berlin and Copenhagen. Equal in importance to the mile-long Golden Gate span is this gigantic European project, begun early in 1930. When completed this year, trains and automobiles will be able for the first time in history to reach Funen di- rectly rather than by ferry. Five arches, each more than half a mile long, support the roadway 100 feet above the level of the sea. This arm of the Baltic being an international channel of navigation, the bridge must have clearance above the waters for the largest ocean liners and warships. Steel and concrete piers reaching down into the water an even greater distance than they extend into the air rest upon solid beds of clay 25 feet below the bottom of the sea. With rough seas threatening to wreck work barges, it was necessary to build the over- water spans piece by piece, high in the air, and use the cantilever method of bridge con- struction. Work was started in both direc- tions from each pier, building out the same amount on each side to keep the tons of steel Inventions, April, 1935 MILES LONG Top photo shows where new -| Danish bridge crosses Grand Belt "| arm of Baltic Sea. Concrete arches on land have already been com- ^ | pleted, one water span is complete. How teeter-totter or bal- ancing method is used to erect cantilever bridges. Map shows location of new bridge, as well as route of Flying Hatmberger, German passenger train, which will use bridge. in perfect balance. Engineering calculations were of necessity carried out to the fraction of an inch, to insure meeting of the teetering girders at the mid point. With the completion of the new bridge, trains can run directly to Funen from Berlin, and thence by ferry and land routes to Stock- holm, Sweden. Other trains will make a “great-circle” trip, turning back to Berlin after reaching Malmo, Sweden. 47

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NE minute to go! Fighting men ripping and tearing at each other.... A figure in white moves nimbly around them. ... The glare of floodlights. . . . A sea of faces in the darkness beyond.... Then— The bell. ... As one, the great crowd is on its feet. .. . There is a tense pause. . . . In the center of the ring, an arm is lifted in victory. . . . A chorus of hoots greets the decision.... The resentment grows.... There is pandemonium. How many times a year do we witness this scene in the oldest and certainly the most glamorous of all sports? Too often, maybe, for the good of the game. In many places where boxing is legal, decisions that bring hoots of derision from the fans are doing in- caleulable injury to a fine sport. What is wrong? Is it the system of ceste ing the winner? Is it the practice of naming 48 CHAMPIONSHIP FIGHTS Above—Baer steps inside of a right-hook to land a hard straight left to Carnera’s chest. The blow was cleanly made, delivered with the fist closed, the knuckles for- ward—the type of punch that is a point winner both with the judges and to the most critical audience. Left—Carnera struggles to rise, as the referee advises Baer to get into a neutral corner while the champion is still down, Using the Illinois system of scoring, ' Baer would score points for the knockdown, but he might lose them if he con- tinued to disregard the referee's repeated warnings to get into a neutral corner. Failure to do this is con- sidered as a breach of sportsmanship as it does not afford opponent a fair chance to regain his feet. Modern Mechanix and

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GEN. J. V. CLINNIN FORMER PRESIDENT NATIONAL BOXING ASSOCIATION Above— Billy Petrolle ducks under a fast left-hook delivered by Sammy Fuller. many in the back of the audience, this may look like a clean blow, but to the refetee and judges, it is obvious that it glanced ineffectively off the back of Pettolle's head. inexperienced judges? Is it the referee? Is it because the fans are prejudiced? Lets see what is wrong and find out if there is a remedy. There are two major boxing centers, New York and Chicago. In New York, until recently, the system of scoring fights was solely by rounds. For some years, Chicago has employed what is the nearest approach to a perfect scoring system and New York is now experi- menting with a similar plan. i In Chicago, the scoring system is one that came into vogue while I was chairman of the Illinois Boxing Com- mission. It was invented by Dave Barry, the referee, and William Battye, one of our most competent judges. I shall explain it briefly: Each of the two judges and the referee is given a card on which are five columns for each boxer. The rounds represent units of ten points each; that is, five points, for each contestant in case of an even round. The columns and their classifications follow: 1. Aggressiveness, clean effective blows; 2. Deportment and sportsmanship; 3. Knockdowns; 4. Penalties—For fouls and foul tactics; [Continued on page 120] Inventions, April, 1935 NOTICE... y, SCORE aad Judges must INSTRU, 32, Ratio iH to 2, 'oltta to Seorg, 2 Dopoesslveness and regret 822 Agal $ Buen and paie Olean tgs For Fo ip lows x Poul Above—Gen. J. V. Clin- nin, former president of the National Boxing As- sociation, and author of this article on judging fights . by point system. Below—A score of a mythical match between Joe Blow and John Doe. In the first round, Doe is penalized two points as he is knocked down. In the second, he loses a point for using a rabbit punch. He gains a point in the third for aggres- siveness and one in the fourth when Blow uses abusive language to the officiating referee. te In} E ATHLETIC petite "s in Pilti Nut OMMISSION A» ILLINOIS CARD í CTIONS TO pointe in to fo Merit, tomi D unde o Folat si ference, ma nahi,

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Light Beams Produce 1800 Organ Tones Photo shows Mr. Eremeeff and organist at the console of the Organ tones are produced by broken light beams. organ. Rail Car Runs On Rubber Tires 8 QYILENT speed” is the feature of the new railroad motor cars used in Austria for quick handling of light traffic. Low, stream- lined, and set on rubber-tired wheels, these new cars whiz silently over the rails at a rate of 70 miles per hour. The cars are 75 feet long, weigh 34,000 pounds, and are driven by a motor that will develop one hundred horse- power. E The Austrian streamlined rail-car is mounted over rubber tired wheels and travels at a maximum speed of 70 m. p. h. 50 N ELECTRONIC organ, in- vented by Ivan Eremeeff, Russian physicist, and Leopold Stokowski, renowned symphony director, produces 1,800 tones through the flashing of broken light beams onto photo-cells. Un- like the ordinary organs, it con- tains no reeds, pipes, strings, or ‘phonographic records. Interrupted beams of light, broken on whirling discs, are flashed onto a photo-cell and transferred to electrical fre- quencies. These frequencies are amplified and reproduced as sound, The organ has two keyboards and two banks of stops to control the 1,800 tones. Mixing of the stops brings forth a variety of un- usual effects. The mechanism will not get out of tune and is not affected by temperature and weather changes. Since all the parts are direct products of the radio, it is expected that building organs will open new fields for radio industries. Alarm Rings As Gas Gets Deadly LOUD gong on a new carbon monoxide alarm is set to ring its warning before this color- less, odorless, tasteless gas be- comes dangerous to human life. Reliable tests show that the alarm rings when the poison gas content of air reaches two parts in 10,000. The alarm rings when the gas con- tent of air is two parts in 10,000. Plane Drops Machinery In Chutes ARACHUTES were introduced into the . delivery of machine parts when they were used to drop mining machinery to an inac- cessible mine near Valdez, Alaska. The ma- chinery was wrapped in mattresses and dropped in chutes from a height of 300 feet. Modern Mechanix and

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Adjustable Club Makes Golf Bags and Caddies Unnecessary HE expenses of the ancient game of golf may be considerably reduced if the inven- tion of Charles A. Rolfe of Beverly Hills, Calif. proves practical. "The invention is an all-purpose golf club which aroused considerable attention at the National Inventor's Congress recently held in Hollywood. The use of this club is said not only to eliminate unnecessary caddy expenses but also to cut equipment charges down to the cost of a single club and a few balls. The head of the club has a plain, flat putter surface, and it is attached to the handle by a swivel joint. The swivel joint can be loosened so that the pitch of the club-head may. be adjusted to the proper angle for any desired shot now made with various clubs. After adjustment, the head is locked in place. The handle of the club comes in two sec- tions and may be taken apart and fitted into a small space when not in use. Body Weight Raises Bike Speed Left— Weight on the seat forces down the lever to propel sprocket gear. Right—When weight is released, seat rises. BICYCLE power seat that springs up and down as the bicycle is pedaled has an attachment to a gear on the sprocket and utilizes the weight of the rider to produce additional power and speed. The seat is attached to a long lever that runs to the gear on the sprocket. At the down-stroke of the pedal, the ratchet seat rises under the body. At the end of the down- ward pedal stroke, the weight of the body is thrown fully into the seat, forcing down the lever which in turn impels the attached gear. Inventions, April, 1935 Photo shows Miss Viola Kivett holding the new golf club. The head can be adjusted to proper position for any golf shot. Wing Valleys Stabilize Air Ride ERHAPS the oddest aircraft that ever actually left the ground was demonstrated at the annual All-American air races recently held at Miami, Florida. The plane, known as the Vacuplane, is only - 16 feet long with short, stubby wings that ap- pear as though they were clipped in the middle. Itis of open cockpit construction and has shallow valleys running from the front of the wings to the middle of the fuselage which are designed to stabilize the air ride. The - plane weighs but 350 pounds and develops a top speed of approximately 96 miles per hour. E. M. Lanier and Wen- dall Fleming are shown with the Vacuplane. The valleys in the side are de- | signed to stabilize ride.

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New Talkie Machine Makes Home Sound Movies Possible How “talkie” movies are made at home with actor speak- ing into microphone on end table at his right is shown above. At right—Photographer speaks into mouthpiece built into camera, his voice vibrating a thin metal dia- phragm which is coupled to a tiny mirtor. Light beam on mirror is reflected to sensitized edge of film to form sound track. Sound changes make fluctuations in film record. School Built To Please Children NDOOR and outdoor class rooms are now being combined and built around a huge playground and swimming pool in a new ex- perimental school now being built in Los Angeles. Built to induce the children to go to school because they want to rather than because they have to, classes will be conducted out- of-doors when the weather permits. Ten classrooms will be built to form a semi-circle on each end. The sides will be completed with administrative offices and manual training rooms. INDOOR GLASS -ENCLOSED CLASSROOMS ARCADE _ INNER PLAYGROUND Above-—-The new Los Angeles school will be built around a playground. The ceilings of the rooms will radiate heat. 52 At left: Rudy Vallee speaks into mouthpiece at back of new “talkie” cam- eta, recording on film run- ning account of event being photographed. In circle: Close-up of cam- eta and sound recorder on - tripod, as used in record. ing sound effects. Weight - of equipment is 20 pounds. With microphone, 110 volt a. c. power is used. NYONE can now make “talkie” movies at home with the introduction by R. C. A. of the first amateur sound camera. Though differing in size only slightly from the average amateur movie camera, the new “talkie” cam- era incorporates a complete sound recording system and weighs only 834 pounds fully loaded. The photographer talks into a mouthpiece built into the back of the new camera, as he focuses on the subject, to give a running description of the scene. When the actors speak for home movies, a separate micro- phone attachment with electrical amplifying © and recording equipment is used. The 16 millimeter film used has sprocket holes on one side, a sound track on the other. Eye Makes Body’s Only Vitamin aur only vitamin made in the human body is a carotene-like, vitamin A secreted in the retina of the eye. Without this substance, the eye would lose its health with “night blindness" or total blindness re- - sulting. Modern Mechanix and

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Design GIANT Planes for Ocean Routes Col. Lindbergh, technical adviser for Pan American Airways, is expected to be the first to make a test flight over the above 9,000-mile trans-Pacific route. England's new "composite airplane’ for the Atlantic route. Giant mother ship will lift smaller sea transport, then release it, as shown at right, after takeoff for ocean flight. E STABLISHMENT of regular air schedules across the Atlantic and Pacific oceans is expected to take place this summer. Col. Charles A. Lindbergh may be the first to fly the transport route across the Pacific in Pan-America's new giant Clipper No. 7. On the other hand, Great Britain threatens to be first to make commercial flying over the Atlantic possible with a new “composite air- plane." The composite airplane is the invention of Major R. H. Mayo, technical adviser for Im- perial Airways. It consists of a mother ship and a smaller plane. At the point of take-off in England the smaller ocean plane will be perched on top of and fastened rigidly to the mother ship. Each ship has four motors. Heavily loaded with fuel, passengers, and Inventions, April, 1935 Col. Lindbergh and his wife (above) may fly to- gether over route linki California and the Orient. 60-hour flying schedule is planned by Pan-American. Destined for Trans-Pacific service this giant Clipper No. 7 can carry 14 passengers, ton of catgo, and holds fuel for a 3,000-mile flight. The ship itself weighs 25 tons. cargo, the ocean transport could not take off under its own power, but with the combined effort of eight motors on the two ships, it is expected to rise easily. At an altitude of 5,000 feet the mother ship will release the transport to return to the air base while the transport continues on its flight across the sea. 53

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CASH for PUZZLE Solutions; No. 1: In how many different ways is it possible to spell the wotd REDDER? Always move from one letter to an adjacent one. The same R or E may be used twice in the same word. Black lines show two possibilities, No. 2: Find the area of the inside triangle ABC in the above field sketch by using only simple geometry and arithmetic. D O YOU enjoy working mathematical puzzles—secret messages—letter combi- nation problems? Try your luck at the three given above, send in your solutions, and you stand a good chance to win part of the $25.00 in eash prizes offered this month. Place your solutions all on a single sheet of paper, making them as neat as possible. Elaborate, artistic entries will receive no more consideration than those clearly writ- ten in longhand or typed. Here's a tip that. may save tedious counting in the first problem—work it backward, start- ing at the center of the word REDDER. There's no need to extract square roots in working problem 2—in fact, it’s not allowed in the solution. Your grammar school arith- metic and a little reasoning will get the answer. A little review of French history will be of help in reading the secret message in No. 3. This tip may put you on the right track: “Laws were set aside.” For the most accurate solutions to all three puzzles Mopern MECHANIX AND INVENTIONS 54 No. 3: What is the message shown on above sheet of paper? offers $25.00 in prizes, as follows: First prize, $10; second, $5; and four third prizes of $2.50 each. Contestants should give age, occupation, and education, though this information will not be considered in awarding prizes. Your entry should be postmarked before April 25, 1935. Decisions of the judges will be final, and no entries will be returned. In case of ties, duplicate prizes will be awarded. Answers to these problems and names of the winners will appear in the July issue. Employes of this magazine or their relatives are not eligible to compete. You don't have to buy a copy or be a subscriber to enter. Address Puzzle Contest, MopERN MECHANIX AND INVENTIONS, 529 So. 7th St., Minneapolis, Minnesota. Send in your own puzzles for future con- tests. If accepted, you will receive payment at our regular rates for such manuscripts. No puzzles will be returned. Modern Mechanix and

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CONTEST WINNERS GET $195 pore PINE. d x e NAILING shi, e GIMP, OR PIPING INSERT LEATHER TAB FOR HANDLE ~ ci 243" coverine | FIBER MAGAZINE RACK PROFILES OF SIDE MEMBERS AND 3'x I$ HARD wooo MAGAZINE RACKS - SCALE - 2" SQUARES- Entries flooding into the office from every corner of the United States and from many foreign countries, each presenting some novel modernization of discarded furniture or giving plans for original home furnishings, were indeed gratifying to the judges. Each showed the popularity of MM contests among readers. After careful consideration of each of the entries from the standpoint of ingenuity and practicality, the judges, editors of Modern Mechanix and Inventions, awarded first prize of $60.00 to Paul E. Miller of Casper, Wyoming. Mr. Miller's winning entry, an arm chair built from an auto seat, is reproduced on this. page, while instructions for building this chair follow. by PAUL E. MILLER HE folding front seat of a Model T Ford coach, having lines very similar to that of modern furniture, serves admirably as the seat of this combination arm chair and maga- zine rack. A simple wood frame, made with ordinary carpentry tools and a scroll or band saw, holds the seat rigidly in position. Grace- fully curving side arms conceal, on each side, [Continued on page 152] Inventions, April, 1935 E X 2" PINE CENTER FRAME STRETCHER d'x 3' Nunc STRIP SY W a DETAIL "AM OUTER PROFILE OF THE SIDE FRAME €ROSS SECTION OF SIDE FRAME & EDGE OUTER LINE OF OF MAGAZINE RACK ere aed o {INCH 63 6 - MODEL "T" FORD COACH FRONT SEAT UNIT SEE DETAIL"A" NAILING STRIP CUT QUT SIOE PIECES OF RACK TO FIT BOSS’ \ OF TRUNNION HINGE 126 CHEV. SEAT LEGS FLOOR LINE SEE DETAIL OF ee TRUNNION HINGE Z A HALF SECTION THRU CHAIR INCH SCALE _ FURNITURE CONTEST WINNERS Selected by the judges as winners in the January, 1935 Modern Mechanix and Inventions Furniture Con- test, the following persons receive the $125.00 in cash prizes offered for this contest. FIRST PRIZE, $60.00: Paul E, Miller, Casper, Wyoming. His winning entry Spheda on this page, SECOND PRIZE, $20.00: Ira Edwards, Neodesha, Kansas—a modernization of the old-fashioned davenport. THIRD PRIZE, $8.00: Glenn E. Miller, Alpena, South Dakota—a buffet made from two upright phono- graph cabinets. OURTH PRIZE, five awards of $5.00 each: Bates Jex, Pittsfield, Illiriois—a smoking stand; W. A. Mar- shall, B. Toronto, Ontario, Canada—converting the vic- trola into a Governor Winthrop desk; Carl A. Schacht, Detroit, Michigan—design for a desk; H. R. Wallin, Brooklyn, New York—a cabinet for the home aquarium; reon A . Desaultes, Indianapolis, Indiana—a portable radio bar. FIFTH PRIZE, six awards of $2.00 each: John G. Diehl, Bristol, Pennsylvania; Olive A. Morris, Cape May Court House, New Jersey; Mrs. Wm. Shackleton, Way- zata, Minn.; H. W. Orr, Topeka, Kansas; Louise Shifter, Howard Lake, Minn.; Ernest J. Coons, Crawfordsville, ndiana. 55

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Umbrella Follows Modern Trend With "Safety" Window The new umbrella window consists of a piece of isinglass set into the front to afford the user clear vision ahead. Harness Prevents Running Escape HANDCUFF harness which prevents a prisoner from running away has been devised by Guy E. Lombard, Portland, Maine jailer. The harness consists of a steel ring held to the prisoners’ waist by a stout leather belt. The handcuffs are fastened to the belt, holding the prisoner’s hands so close to his body that he cannot gain balance to run. HE old umbrella, for ages untouched by the forward moving wheels of progress, has responded to the spirit of the times with the addition of a new front window to afford better vision. Hitherto, the umbrella user either had to carry his umbrella so high that it was of no practical use, or he pulled it down and took reckless chances of collision with oncoming pedestrians. The new isinglass window eliminates these hazards, and affords a chance for people to use their umbrellas to shed the rain without fear of poking out the eyes of a fellow citizen. Campbell To Attempt Record Run Above—Campbell is shown driving the Bluebird, the rebuilt racer with which he will attempt to break his land speed record. LAT, streamlined, and swung low to the ground, Sir Malcolm Campbell’s rebuilt “Bluebird” has been pronounced ready for another try at the world’s land speed record now held by Campbell himself. The new racer has a slotted radiator that can be closed while traveling at top speed to lessen wind resistance. A fin-like projection deflects the winds smoothly from the rear end to prevent vacuum drag. Clock Hands Show Valve Position VALVE position in- dicator with a clock face and hands can be read at a glance and tells exactly how many turns the valve is open. Like a stem set watch, the hands change position when the valve is Edward Brown is shown demonstrating the handcuff harness The hands on dial indicate the num- which prevents the prisoner from gaining balance to run. ber of turns that the valve is opened. turned. 56 Modern Mechanix and

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Giny Electric Plate and Handy Jron Lighten Labors of Busy Housewives ELECTRIC STOVES, designed especially for light house- keeping, have one electric piate and a special drawer that can be used for baking, broiling, or toasting. The drawer con- tains an aluminum pan and a broiling rack, both removable for toasting. A plate over top converts broiler to oven. ELECTRIC IRONS with the conventional front handle bracket eliminated : 4 nm now permit the ironing of : : “~~ d 3 5 a single cloth where hither- Eu et 36 ^ EXTENSION CORDS to the cloth had to be : à Bies SOS à : ate now shortened to ironed in layers, impress- any desired length ing the print of the top E e through the use of a layer into the bottom. This disc, fastened to the new arrangement makes it ^ [^ " base of the lamp, which possible to iron inside t 1 : : works like a window sleeves and around collars uy : EX ee shade to roll all extra and lapels without snagging. í . smod : cord into the lamp base. EAD ~ Ui d DRESSER BEDS for small bedrooms have a special vanity table attached to the base-board. The vanity is built of the same material as the bed and has two large compart- ments, one on each side, for the storing of toilet articles and shoes. When the mirror is not in use, it may be shoved down into the frame, leaving the table top clear. Inventions, April, 1935. 57

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| ELECTRICAL CITY Nestling on sagebrush plateau high above swift-flowing Columbia river is Mason City—-a town without a chimney—world’s first all-electric city! RESTO! This was the exclamation of wonder when, not a generation ago, elec- trie lights flashed on as tiny buttons were pushed. The invention of the electric washer, the electric range, the electric refrigerator, and the electric heater in turn brought forth this same exclamation. But that an entire city should “Push the ` button" for all these purposes—that a town which is the home of nearly five thousand people should be built without a chimney is “presto” indeed; particularly when the city has been built within two months on a high sagebrush plateau in one of the wildest and least populated districts of the far west. Homes of U. S. engineers can be seen on near side of river. Grand Coulee Dam is being built at this point. Such a miracle has happened. Mason City, constructed for the families, employees and officials of the contracting firm which is build- ing the mammoth Grand Coulee Dam on the Columbia River, 92 miles west of Spokane in central Washington, is an all-electric city— the first in the world. E The inhabitants of Mason City will con- struct the world's greatest dam—almost four times as long as Boulder:Dam, and with twice the power capacity of the gigantic Muscle Shoals project. In the development, the larg- est conveyor system.in. the: world will carry spoil dirt from electric shovels even bigger than those used on the Panama Canal; the largest trailer in the world, pulled by giant trucks and caterpillar tractors, is now hauling in heavy machinery and electrical equipment. Twenty-ton transformers are hauled to electric city on world’s largest trailer. Two tractors hooked on to rear are necessary despite powerful air brakes on towing truck and trailer..to. make descent safely into canyon of Columbia river when approaching dam site. Modern Mechanix and

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5 Built Without CHIMNEYS Strikingly beautiful is this night view of world's first all-electric city—town built on east bank of Columbia river for construc- tion workers on Grand Coulee dam project. Temporary wood bridge crossing river is expected to be destroyed by spring floods. Every one of the 360 homes, as well as the business and office buildings, will be heated by electricity. Enough heating equipment is installed to keep buildings comfortable even at 29 degrees below zero, the lowest recorded temperature in the vicinity of the Grand Coulee in 22 years. In addition to the heating units, each home has an electric range and electric refrigera- tor Some of the larger homes will be . Chimneyless homes like that shown at right were erected by crew of six men at rate of six a day, after lumber was cut to size and trimmed in Spokane mill. Inventions, April, 1935 equipped with complete air-conditioning plants. DR The heaters used are portable, the plans calling for 1% to 6 kilowatt units in each of the rooms. Twenty-eight thousand heaters will be needed for the first 360 houses. The cost of installing and equipping a five-room house with these heaters will be approxi- mately $160, as against about $250 for a [Continued on page 129] Left: Interior of one of five-room electric homes provided for workers building Grand Coulee Dam at Mason City, Washington. Port- able electric heaters in 11 to 6 kw. sizes, like that under windows, are used in each room.

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Turntable Swings Autos To Pumps In Rotary Gas Station Above—The booth and service pumps on the center island remain stationary; the autos are carried past on turntable, Below is shown an exposed section of the new turntable. Build Light Diesel Plane Motor N EIGHT cylinder gas or Diesel airplane engine with 51 per cent less parts than the ordinary airplane motor was shown at the Hollywood National Inventors Congress by inventor F. A. Van Bezel of Los Angeles. The motor is of the double acting, rotary sleeve valve type with a force feed directly to the valves. It weighs 151 pounds, is easily accessible for repairs, and develops 88.8 horsepower. F. A. Van Bezel is shown demonseatine his new motor. It has 51 per cent less parts than the conventional airplane motor. 60 | NEW type of filling station that uses a turntable to whirl automobiles around a cen- ter service island was recently opened in New York. The service island is set in the center of the turntable and con- sists of an enclosed office with three separate pumping units to dispense gasoline, oil, air, and water. As the auto drives onto the platform, an attendant on the island presses a button which carries the auto into one of the three service positions. When the servicing is completed, the auto is swung out to the street and can be driven off with- out going into reverse to leave the station. The turntable, 37 feet in diameter, can be housed in a building 41 feet wide. It will ac- commodate three automobiles simultaneously and allows a complete service in two minutes. . Shower Coupling Fits oxi Faucet NEW coup- ling, de- signed for at- taching portable shower hoses to a faucet has a stepped-off steel nipple which will hold all shower hose sizes. Ad- justable braces permit horizontal and vertical tightening. A rubber washer at connecting point forms a close fit with faucet to prevent leakage. Coie may be tightened two ways to fit atty size of faucet. Safe Explosive Resists Flame NEW explosive for blasting work in quarries and coal mines cannot be set off by strong commercial blasting caps, jarring, or fire. It is produced only in large diameters for extremely heavy types of work and can be exploded only by a large dynamite cartridge. Fumes from this explosive will not produce a headache. It i is packed i in air and waterproof packages. Modern Mechanix and

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How to Stain Your MICROSCOPE SLIDES - When staining slides in modern university laboratory, glass racks holding up to ten slides are transferred from one dye- ing solution to another after proper period of immersion. by JULIAN D. CORRINGTON, Ph. D. ACOB'S coat of many colors had nothing on the array of dyes used daily by the laboratory microscopist in making transpar- ent objects visible under his instruments. Colors galore—reds, blues, and greens in scores of delicate shades—are to be found in the dye-filled vials covering his laboratory . tables. The microscopist uses color not for decora- tive purposes, but only to reveal the secrets of the tiny animal and plant cells which he studies. In many cases two or more colors are used on a slide to provide contrast. Here special dyes which react only to certain parts of the specimen are used. For the amateur microscopist, one of the simplest experiments in staining can be done with a small piece of cotton fabric. Prepare eosin stain by placing one gram of the dry powder in 100 cc of 9595 alcohol and stirring until dissolved. If desired, this stain- ing solution can be purchased ready made from scientific supply houses. Immerse the cotton in this solution for one hour. Remove the goods, rinse in fresh 9596 alcohol, and : mount on a blank slide for temporary exami- nation under a microscope. If you find the cotton insufficiently or Inventions, April, 1935 When staining individual slides, solution may be applied with dropper as pictured above. Cross-section of stem of Dutchman’s Pipe, at upper right, is example of two-color staining. Without dyes no detailed structure would be visible. unevenly stained, repeat the staining for an- other hour. If your final color is too dark, you can easily lighten it with acid destain, made up by adding one or two drops of pure hydrochloric acid to a vial of 95% alco- hol. Allow the cotton to remain in the destain only as long as the-color comes away freely —further immersion will undo all the work of staining. Rinse in fresh 95% alcohol sev- eral times, adding a pinch of bicarbonate of soda to the first of these rinsing alcohols to [Continued on page 132] 61

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Stout Invents Top Wing Slot To Eliminate Plane Stalling AIRCRAFT IN NORMAL POSITION EXHAUST. PORT: TOP VIEW OF PLANE SHOWING , INTAKE SLOTS | | eT f AR AND exaust BORE The three wings on the left show the air currents as they are deflected smoothly over wing top by front slotted wings. The Stout slots (right) are in the wing tops and suck in air to break “back eddies” and deflect it to cool the plane’s motors. IRPLANE stalling due to “back eddies” on the top surface of a tilted plane wing is said to be eliminated by a wing slot recently patented by William B. Stout, noted inventor and designer of the first all-metal Ford tri- motor plane, Hitherto, when the wing of a plane became tilted at a certain angle while traveling at a low rate of speed, these dangerous eddies broke the lifting force of normal air currents. The result was a loss of flying speed with the resultant danger of going into a stall and crashing. This danger was somewhat cut down by the wing-tip slot which was set in the leading edge of the wing to force a smooth flow of air over the wing top; Stout's wing-top slot is said to prevent stalling entirely. With the new wing-top slot, the downward eddies wil be broken and sucked in by a motor. Inside the wing, the air will be diverted to cool the motor. The ship's pro- pellers at the trailing edge of the wing pull the air through an exhaust port, a small hole in the wing behind the motor, N ORDINARY tree with fifty feet of foliage gives off about five barrels of water per day. The water is given off in the form of vapor and is absorbed by the air— Ben Schuler, Ridgewood, New Jersey. The archer fish, an inhabitant of tropical waters, shoots his prey with a stream of water, : Lying close to the surface, he shoots at flying insects, sometimes at a distance of . four feet. The force of the stream knocks the insects to the water where they are eaten by the fish.—J. W. Lawrence, Vancouver. OF SCIENCE Tests on the vegetable prove that if a person is as “cool as a cucumber," he is exactly one ` degree cooler than the surrounding air.— Edward Merdinyan, Pawtucket, R. I. Germs have been discovered alive in the pyramids of Mexico. The germs are believed to be thousands of years old.—Melvin Cohen, New York. Diamonds will burn if heated red-hot and Diamonds, plunged into pure oxygen gas. like coal, are formed from carbon. 'They are com- pactly crystalized and do not burn easily. There is not enough oxygen in or- dinary air to cause com- bustion.—Robert Arm- strong, Stockton, Calif. Modern Mechanix and

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RACING DEER NEWEST SPORT, , „5 by F. LELAND ELAM 5 oes Breaking away from the starting boxes, the deer dash away like greyhounds. A police whistle is used to start them out. LEETFOOTED deer are being trained for the hurdles and obstacles of the steeple- chase course in California's newest racing sport. They have been taught to circle a race track and leap hurdles with greater ease and grace than the best horses. Mr. and Mrs. Wilbur Timm, of Kelsey, Calif., started the new sport. More than a year ago they caught five young deer in Oregon. When the animals were three months old, the first step in training began. Each deer was taught to wear a collar with a leash. The leash was attached to a wire fastened between two trees to permit the deer to run back and forth. Because of the danger of the animal injuring itself in its efforts to get free, the trainer was with it night and day. When the deer became accustomed to the collar and leash, he was taught to lead. For two days the animal was led about without stopping. Worn out, the animal finally gave in and followed the trainer willingly. The hurdles were next, the deer following the trainer over each hurdle. Because a deer will not run fast unless pursued, a horse and rider urged him to racing speed. After many races the deer got the idea of racing and vied for the lead. The horse, however, always follows them. Inventions, April, 1935 Going over the hurdles ful than steeplechase horses. When racing around the track, the deer are pur- sued by horsemen. After mahy races. the deer will race alone, but are in. clined to be moody and may balk. Above—Mirs, Wilbur Timm and five young deer that were trained fot racing. ; deer are swifter and more. grace. Trained deer enjoy racing. 63

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CLIPPING DOLLARS FROM TABLE SHOWING COMPRESSION RATIOS OF WELL-KNOWN CARS FOR MODELS OF 193i-34 [932 [2 B AUBURN 6-52 i| BUICK 34-60 CADILLAC V-l2 CHEVROLET MSTR 6 ; CHRYSLER & DODGE ê | OE SOTO FORD V-8 g GRAHAM STD 6 HUDSON 8 A HUPMOBILE NASH 8& J| OLDSMOBILE & PACKARD & PLYMOUTH jj PONTIAC 8. STUDEBAKER 8 AVERAGE Experimental engineers are shown checking gas mileage after a test run. Each can holds an exact measure of various testing fuels. A SQUAD of marathon drivers recently piloted cars of all makes over western highways in a series of gruelling road tests. Attaching to each a special gasoline tank con- taining an elaborate series of measured com- partments, and using precision odometers re- cording distance down to 1-1000th of a mile, they put their automobiles through weird and racking ordeals. They ran them up-hill at a snail’s pace, raced them into the wind, climbed to 10,000-foot mountain peaks, made rocket-like getaways, and squealed to sensa- tional stops in clouds of burning rubber smoke. They tried every gas and oil known to man in various combinations, using high precision instruments to record the results. Then, from notebook, table, and chart, they read figures which revealed secrets of stingy driving by which a driver can actually cut his gasoline bills as much as fifty per cent. 64 Above—The intake and. ex- haust ports of a popular car ate separated to lower tempera- tute and prevent pre-combus- tion. Below—A calibrated. measure full of fuel is attached to window to test gas mileage. Do you know your engine's compression ratio? Probably not three drivers in a hun- dred do, yet this information is important in choosing the right fuel for economy and power. Do you know what octane number is best to use? Are you on speaking terms with SAE numbers in grading oils? These things are more than obscure engi- neer's jargon; they mean a chance to fit your car with gasoline tailored to meet its needs, Modern Mechanix and

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AUTO RUNNING EXPENSES MAXWELL REID GRANT: ~ Z pro d Above left-——Adjusting a * catburetor for leanness and idling speed helps keep the motor in tune. Below— The “octane selector" ad. justs the motor to handle the fuel that is being used. and to save many dollars in fuel, oil, and re- pairs. : The way you drive probably has more to do with your gasoline bill than any. other factor. Records prove that modern cars can be run economically. Last year the dealers for a popular make of car staged a “Scotch driver” contest, in which the public was in- vited to see how far they could drive on a pint of gasoline. accurate glass measuring tube, attached to the window beside the driver, so that he could Inventions, April, 1935 The fuel was put into an A b ov e — Charles F. Becker is shown at the controls of the elaborate equipment used to test gás consumption under vátying conditions. Left —Adjusting the heat control on a popular car prevents waste from im- perfect fuel combustion. see for himself how much he was using. Rub- ber tubing connected the device to the fuel line. All contestants drove over the same route, which was fairly level but took them through some city traffic. When the scores were turned in, many peo- ple refused to believe them, for the winners drove as far as 50 miles to the gallon! There was no trick, however. “Scotch” driving, plus a carefully tuned motor, was the secret. Automobile men are chuckling over a story that is still going the rounds. Dealers for a light car no longer manufactured, set out to [Continued on page 123] 65.

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Collapsible Steel Phone Poles Can Be Erected By One Man Right— One man erecting pole without tackle. Left-——A buckled pole can be tepaired by replacing a section. Inset -—Carrying a collapsed pole section. NOVEL type of telegraph and trans- mission pole that can be carried in sec- tions and erected by one man without the aid of tackle and hoisting gear has been put into service in London, England. The poles consist of two sections. Each section contains 12 tubular units that fit one into another and which can be extended to a length of about 30 feet. The sections are fitted together before raising and tightened to a close fit by a hand-operated gear. The cross-section arms that hold the insu- lators are welded into a ring that is slipped or clipped solidly onto one of Wie uppermost sections of the pole. Marconi Predicts Talks to Mars '"NTER-PLANETARY radio communica- tion between the earth and Mars is not at all impossible, according to a statement by the Marquis Guglielmo Marconi, inventor of the wireless telegraph. “It is simply a case of im- proving present-day instruments sufficiently,” he said. Noting the rapid forward progress of radio, he claims that since there is no limit to distance, there can be no limit to radio development. 66 Frequency Waves Aid to Hearing N ELECTRIC machine which sets up radio frequency oscillations and is said to alleviate ear troubles and deafness, was shown by its inventor, Frank C. Kerk at the . recent National Inventors’ Congress in Holly- wood. Though they cannot be heard or felt, the radio frequency oscillations set up vibrations in the eardrums. These induce an artificial © fever, which, it is claimed, create a curative flow of blood into the affected tissues. Above picture shows the new machine which is said to alleviate the efiects of deafness by radio frequency waves. Modern Mechanix and

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Revolving Mast Solves Tacking ; NEW type rigging for sail boats which automatically sets the sail on a change of wind, was recently invented by Fredrik Ljungstrom, Swedish engineer. It is said to simplify sailing to the point where one man can easily handle any of the smaller sized boats. The new rigging is a revolutionary develop- ment consisting of only one double-folded sail fastened to the front of the mast from top to bottom. The mast, itself, is set farther for- ward than is customary and revolves on ball bearings to keep the sail billowing before favorable winds. An endless rope is fastened to the sail tips and passed through a pulley on the stern deck, automatically shortening and lengthening to keep the sail taut as the mast turns. The sail winds around the mast for storage. Traveling Bag Yells At Thieves TALKING bag that emits loud, strident warning shrieks when touched by a per- son other than its owner, was designed by H. Adler to thwart the silent skill of burglars and baggage snatchers. The talking unit can easily be placed in any type of traveling bag and wired to a concealed switch known only to the owner. Such a bag can be left unattended in shops or stations and has already attracted the at- tention of bond men and jewelers who must often carry valuables through crowded streets. The inventor, H. Adler, with his talking bag unit designed to emit a warning cry when lifted by an unauthorized person. Inventions, April, 1935 Sets Sail Automatically REVOLVING MAST s EQUALIZING ULLEY Fredrik Ljungstrom and two friends in a boat equipped with the new rigging. Upper left—Top view of rigging con- struction showing how it revolves to catch the wind. Venom Cures Bleeding Patients HE venom of one of the world's most deadly snakes, the Vipera russelli of Southern Asia, has a curative effect when ap- plied to bleeding cases. So powerful is this poison as a blood clotting agent that it can stop severe cases of the "bleeding disease." Combine Radio Phone and Mike NEW hand- set for port- able radios com- bines a micro- phone transmit- ter with a tele- phone receiver to resemble the conventional *French" tele- phone. The hand- set is chiefly de- signed for use in police squad cars having two-way radios. The new hand set combines a microphone transmitter with a sensitive telephone receiver. 67

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SCHENCK IBUBILIDS From chimney top to basement the 1935 home is new. If you want your home to keep step with science, read this story. by PAUL D. PADDOCK This modetn, entirely fireproof home was built for $2,700. It is 100 per cent concrete. Cement paint covers the walls. | Dept are rising, hammers are ` swinging and new roofs are gleaming in the sun! America is building new houses! In 1933 and 1934, we built less than 80,000 family homes, a pitiful total for a nation of 30,000,000 growing families. Conservative authorities declare that we have a shortage of more than 600,000 homes. This year will see 100,000 new houses built, possibly more, as the gigantic task of home-building gets under way. The 1935 model is not just another house. From chimney top to basement it’s new. More than 300 materials, structural, decorative and otherwise, new to what commonly was in usage six years ago, are now on the market. Scores of others are in the laboratory stage. Science has turned house-builder. It offers the builder a product that, in some respects, is as far in advance over the old-fashioned Pre-cast concrete joists * are shown above in place. -Concrete $ beams sim» plify build- ing and a " make home house as today's automobile is ahead of the tant. They earliest models. . i l I EM form deco: The house that science already has built and CONCRETE JOIST SECTION Nolet is building today cuts fuel bills. Reductions floor joists. 68 : Modern Mechanix and

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the MODERN HOMIE This Cape Cod cottage with latest home improvements was built for $6,000. Walls are of concrete, painted white. of fifteen to thirty per cent are common mat- ters of record. The new house cuts the cost of summer cooling and promotes the efficiency of air-conditioning apparatus the year around. ` It saves steps. Where a woman walks four miles a day doing her work in an old- fashioned house, she walks three or less in a modern house of equivalent service. The house science is building is far easier to keep clean and far more healthful. It is justi- fying lower insurance rates and other main- tenance costs. It is more successfully built to withstand storms of all sorts, fires, and in- sect ravages. It is styled for the times and for the people in step with the times. Common sense is replacing convention. The above statements are not claims, They are facts. Houses already up and occupied prove every assertion just made. This article does not relate to the “fad” house or the “freak” house. The new house that science is building is as natural as the automobile and fully as necessary. Economy, greater simplicity, smart new Inventions, April, 1935 Blankets for the house roof and walls, such as the above, are made from limestone, slag, glass and other materials to reduce heat losses and keep out summer temperatures. style, interesting use of color—these and other generalities apply to the new house, but take a look at some of the specific products that go into this new American abode. Air-conditioning and the new insulations it has inspired, form one of the most interest- ing chapters in this new building drama. Just recently, engineers dusted off an old scientific principle and put it to work to make modern 69

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- Aluminum House Armor Keeps Out Summer Heat, Holds Winter Warmth Shining armor of aluminum is being applied to outside wall of this house to reflect summer heat rays and bounce heat back into the house during the winter. houses warmer in winter and cooler in summer. That principle is this—a . bright, dense metal surface re- flects heat rays much as it does light rays. A razor-thin film of gleaming aluminum, 95/1000 of an inch thick, to be exact, has been applied to building paper, lathing material, sheet rock and other sub- stances to serve as effective insulation. Properly applied, with allowance for air space so that the metal does not actually touch the bulk of the rest of the wall, this “magic armor” bounces the heat rays back when they try to get into the house in summer and bounces them back inside when they try to leak out in winter. If the heat rays can be controlled, the problem of human comfort largely has been solved. Tests with these metallized materials show that they have the insulating equivalent of twelve inches of brick or twenty inches of concrete. So far as can be determined, the metal will last in- definitely. As long as it stays bright and shiny, and the engineers say it should not get black when properly installed, it serves as a reliable and economical protector. There's an equally interesting story in a 70 | | ALUMINUM INSULATION NA Drawings above show how alu- minum sheeting protects the home during summer or winter. VSDEFIYDRATED AIR SPACE OUTSIDE s TEMPERATURE -l'E poe pa PAN WINDOWS OUTSIDE Above—N e w double-paned window reduces loss of heat. Right — Alumi- num lath ma- terial has re- $ flecting heat side and dull 5 side for plaster. 2 ss > 5 tine? new double-paned window now on the market to replace the usual storm windows, The in- ventor, by the way, worked it out first as an idea for store counters and refrigerator doors. He applied it to houses and just the other day, a large manufacturer bought him out. New ideas for house materials are promising money-makers! This double-paned window not only pre- vents heat losses in winter but it ends frosting and condensation on window glass. The two panes of good, clear glass are held apart a fraction of an inch by a special material which expands and contracts but doesn’t crack or break. Between the panes is a layer of [Continued on page 126] Modern Mechanix and

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New Projector Throws Illustrations Behind Speaker's Back IACING the audience as he talks, a speaker may now illustrate his lectures on a screen behind him without turning around with the aid of a novel optical projector recently per- fected by a well known German firm. The speaker, directly facing his audience, illustrates his talk by writing or drawing horizontally on a sheet of cellophane lying on a glass table before him, and the script is pro- jected, ten to fourteen times enlarged, on the wall screen behind him. Underneath the glass table, the light of a 500-watt bulb is condensed and reflected through the transparent cellophane. The lines then pass through a lens to the mirror and are projected onto the screen. Baby Bounces in Safety Chair Right—The safety chair is supported by a spring leaf slipped into a slot on the floor. Left—The chair used in an auto. SAFETY chait which combines the en- joyment of a spring ride for the baby with assurance to the mother that he will not get hurt provides a solution to the problem of baby tending for the busy housewife. The chair is built high to support the baby’s back and is set on a strong steel spring leaf fastened to a slot in the floor. The baby’s legs straddle a hobby-horse head which pre- vent him from falling out of the front. Stir- rups provide a natural rest for the child’s feet. The spring of the safety chair may also be slipped into a slot in the auto floor, and it will eliminate all heavy shocks to provide baby with a smooth, comfortable ride in spite of rough and rutty roads. "Inventions, April, 1935 up do XC MIRROR ADJUSTABLE. OBJECTIVE LENSES WATER CHAMBER ACTING AS ] CONDENSING LENS il SHEETS PLACED Siri — ONGLASS TABLE a | MIRROR SERA , A lecturer illustrating the use of the new projector. Lower left—A diagram showing the basic action of the projector. Pole Affects Radio Wave Speed HE theory that radio waves cross the Atlantic with the speed of light, 186,000 : miles per second, was shattered recently with the discovery by Dr. H. T. Stetson that they sometimes travel at a rate only half that great. It is believed that the speed of radio waves is decreased as their course of travel nears the earth's magnetic north pole. This discovery destroys the scientists’ method of computing distance by the speed of radio waves. Instrument Solves Math Problems PRE in trigonometry are said to be J. easily solved without numerical calcula- tion by a triangular mechanical calculator recently devised for students, instructors, engineers and draftsmen. A movable hypotenuse, divided into decimal parts of an inch, is attached to a right triangle having a scale of degrees. By setting the hypotenuse and extra ruler to the known constants of a triangle, the unknown sides and angles can be read off di- rectly to an ac- curacy of two or three decimal points in a short time.

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Though undergroud fire is burning all around, this oil well near New Straitsville, Ohio, is still producing. Road suddenly sank five feet here (at darker part) and had to be filled in. Where fire broke through into coal mine being worked by small group of miners, forcing them to flee or be burned. Underground fire now covers six-mile area. Mile-long cracks have opened across the hills, with open fire visible below. 72 Overnight cistern of this home became belching smokestack for raging coal fire far below, compelling owner to tear down home, Piece by piece, and move it hurriedly to more solid location. ORTUNES have been spent in futile efforts to stop a great underground fire which day by day creeps closer to the busy town of New Straitsville, Ohio. Started in a coal mine some fifty years ago by striking miners, the fire has spread from one coal vein to another, creating great pits in the surrounding country, splitting hills open, and undermining buildings. The town itself is in grave danger of sinking, building by building, into the raging inferno. Cement walls sunk into the earth have not stopped the constant gnawing of flames. All known crevices have been sealed and steam forced into the great labyrinths to no avail. Creeks have been diverted into the mines in futile attempts to drown out this persistent and deadly fire. Valuable forests have been stunted or killed by the heat. One unlucky home owner in the vicinity woke up in the morning to find his cistern full of fire instead of water, and the foundations of his home sinking into the flaming pits. Needless to say, his home and belongings were moved forthright. The federal government has become inter- ested in attempts to save New Straitsville. Modern fire-fighting equipment used under the supervision of the United States Bureau of Mines is expected to conquer at last the fire which has dropped property values almost to zero in the vicinity, and which has for half a century enshrouded homes and stores alike in a veil of murky smoke and lethal gases. Modern Mechanix and

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Fake Cats Scare Birds and Mice to Save Scotchman's Crop RAFTY are the birds and field mice that eat the farmer's seed as it is planted; craftier than they is William H. Randall, a land-owner in Southern Scotland who, find- ing the futile flutterings of the ordinary scare- crow a poor guard against hungry scavengers, ‘has enlisted the aid of an army of cardboard cats to guard his crops. Painted white on one side and black on the other with grotesque eyes and whiskers, they are almost perfect crop savers. The cats are cut from stiff cardboard and nailed to laths so that they may be set in the soft soil of a newly planted field. After the seeds have germinated and formed roots, the cats are pulled up and saved for the next sowing. Paste Removes Old House Paint NEW paint remover, manufactured in the form of a paste, is produced espe- cially for exterior use and is applied directly over the old paint by means of a brush. It is said to have a distinct advantage over the old methods of scraping or using a blow torch. It ean be used on a windy day, and it im- mediately pro- vides a smooth surface for paint without prelimi- nary sanding. Two coats of paint cover it easily, whereas it takes three to cover a torch charred surface. Using the new paste, the old paint is easily scraped off with a putty knife five minutes after application. Wire Web Controls Alarm Bell INE electric wires stretched across the room in spiderweb fashion and connected to a master wire sensitive to the slightest change in tension feature the new burgular and fire alarm perfected by a French inventor. The wires are fastened to all the doors and windows of the room and pulled to the de- sired degree of tautness by closing the door as the owner leaves the room. If the door is opened again, the slack wires contact to set off an alarm. Soft metal connections melt to release the wires in case of fire. Inventions, April, 1935 ` A view of new press. Randall and his family are shown setting up cardboard cats to keep birds and mice from weed d the newly planted Build One Thousand Ton Press RIVEN by a 50-horsepower high torque motor, a huge new punch press, the largest of its kind in the world, will develop the tremendous pressure of 2,000,000 pounds, enough to bend a cold steel plate one inch thick and twelve feet long or a plate eighteen feet long and 34 of an inch thick. The ram has a six inch stroke and a six inch adjustment with a distance, bed to ram, of 14 inches. A gear shift transmission permits regulation of speed from five to twenty strokes per minute. A huge ball-bearing under the fiywheel is 56 inches in diameter, weighs 4,000 pounds, and runs at a speed of 600 revolutions per minutes. The punch is conveniently operated from any one of several control switches. It will develop a serene of 2,000,000 pounds to bend and form cold steel plates of unusual 1 thick- It will also handle welded steel for machine parts. 73 nesses.

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NORTHERN PIKE - BACKGROUND-GREEN WITH. YELLOW OR WHITISH SPOTS INEVEN ROWS, 14 TOI6 GILL RAYS PICKEREL BACKGROUND— OR BARS. H TOI GILL RAYS At left—A muskellunge and north- ern pike hanging side by side. MUSKELLUNGE Ligh spots in even rows on the BACKGROUND= pike identify it from the muskel- GREY WITH lunge which has darker spots than DARKER SPOTS. its background grayish coloring. 17 TOI9 GILL RAYS A blindfolded person could identify the three pike members by counting the gill rays or bones as shown in above sketch. SCALES ABOVE À ( GIH- COVERING i gremeng as it may seem many fisher- RAR i E men can not specifically name the fish they catch. They will say, “It looks like a perch" or "It's a bass," but whether it is a large mouth or small mouth, they can not say. In some ways this is true even among ex- perienced fishermen. Some of them can not distinguish between the pickerel and the northern pike, and the northern pike and the muskellunge. No greater confusion exists than in identi- fying the members of the pike family which includes three species, the muskellunge, great northern pike, and pickerel The tendency is to bracket the great northern pike and the T three members of the true pickerel species PICKEREL scares COMPLETEN NY : into one. In the same way the muskellunge VER CHEEK AND GILL. ^^ | and the great northern pike have been con- i fused. Some fishermen believe that when a To identify pike family note the scale covering on the cheeks great northern pike grows large.in size, it and pue ante asit esie s R becomes, not. a pike, but a muskellunge. northern pike is completely scaled, but only half the gill is : covered. Both cheek and gill are completely scaled in pickerel. Hence we often see a large pike panned off 74 à Modern Mechanix and " MUSKELLUNGE NORTHERN PIKE SCALES EXTEND HALFWAY OVER GILL COVERING 2727 Karge Ly Ld HE any oy

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CAMPFIRE ROBERT PAGE LINCOLN Hunting amd Fishing Editor The "pickerel" you are catching may be ‘small northein pike. Although you may know your fish, the statements of this ex- pert may surprise you. Waser MOUTH USUALLY BROWN OR BROWNISH GREY A Rage GROUND: Line drawn through eye of bass, as shown at right, will distinguish small mouth from the large mouth. Red : eye of small mouth will identify it. Scales of small mouth bass are small. as muskellunge. Every fisherman to gain the most out of the fishing pastime should know the fish he angles for! , While there are three varieties of the muskellunge in North America (the only place in the world where the species is found), they are all very much alike, save for a few . varying spots, blotches, or bars on the body. The three varieties are: the northern or un- spotted muskellunge (Esox immaculatus); the spotted or St. Lawrence muskellunge (Esox masquinongy); and the Chautauqua muskellunge (Esox ohioensis). All three may be found hobnobbing in common in the same water. The fisherman should know that a muskellunge is a muskellunge whether it is unspotted, spotted, barred, or striped. So far as size and length is concerned, the great northern pike rarely comes up to the mark set by the muskellunge. Following the same line of comparison it may be said that few true pickerel ever get as large as a six or eight pound great northern pike. Most pickerel range around a foot to fourteen inches in length. In coloration alone the muskellunge differs from the great northern pike, the only fish with which it could possibly be confused. The background coloration of the muskellunge is some shade of gray, either light or dark gray, whereas the pike is green in background color, Inventions, April, 1935 LINE THROUGH EY MOUTHAHEAD OF LINE THROUGH | EYE. ; BACKGROUN GREEN WITH BLACKSTRIPE Above is an excellent specimen of a muskellunge caught by the author. | It weighed 35 pounds. It was partly blotched or spotted with wavy streaks. At left is a large mouth bass, Note its flabby stomach which is not found in the small mouth bass. The background coloring of the large mouth is green. X LONG,SLIM BODY | TWO BACK FINS Ww SY WALL-EYED The wall-eyed pike and sauger are really members of the erch family. Both look much alike. The sauger, however, is a slimmer fish, is lighter in coloring, and usually weighs less. The body of the wall-eye is rough. Pike family mem- bers have slimy scale covering and have just one back fin. 75

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RAINBOW TROUT BLACK SPOTS. REDDISH OR PURPLISH BAND ON SIDE A WITH i NÑ BROWN [BE TROUT RED SPOTS LARGER THAN BROOK TROUT BL UE Distinguishing characteristics of four trout commonly found in American waters are shown above. Brown and brook trout may be confused, but the latter has small scales scarcely seen with the eye, small red spots, and worm-track marked fins. sometimes light green and sometimes dark green depending upon the water from which it is taken. On the grayish background coloration of the muskellunge there are darker spots or blotches. In comparison, the spots on the great northern pike, instead of being dark, are pale yellow or whitish and are set more or less evenly in rows up and down the sides. These rows of spots on the side are possessed alone by the pike; the muskellunge does not have them, nor do any of the true pickerel. These rows of light, yellowish spots should at once set the pike apart from the other members of the pike family. Two unfailing means of recognizing the members of the pike family is to take note of the scaling on the cheeks and gill covers and to count the number of rays or bones in the gill covers or opercles. In the muskellunge the upper part of the cheeks and the gill covers are scaled, the lower half of each being free from scales. In the great northern pike the cheeks are com- pletely scaled, but the lower half of the gill ‘covers are bare of scales. In the three true pickerel both the gill covers and cheeks are covered with scales! Spread the gill cover of a member of the 76 N Aj LAKE ^ "TRO! WHITISH SPOTS ON GRAY BACKGROUND > rę age This 34-lb. lake trout was caught in the Lake of the Woods, Minn. Except at the tail, most of its spots have vanished. pike family whose identity you wish to es- tablish. By running your finger and thumb along the lower edge of it you will note the bones that line it, being about a fourth of aninch apart. These bones, or branchiostegal rays, as they are called, aid the fish in open- ing and closing the gill covers as it breathes. The number of bones in this gill cover tells you what sort of fish you have. In the muskellunge each gill cover, left or right on the fish, contains each 17 to 19 of these rays. The great northern pike ranges 14 to 16, while all three pickerel have 11 to 13 rays in each gill cover. It is interesting to state that one should be able to tell any ‘of the three members of the pike family apart with eyes closed, merely by running the fin- gers over the gill cover edges and counting the number of rays that each possesses! There are three pickerel recognized in this country, namely, the eastern or chain pickerel (Esox reticulatus); the little pickerel, or [Continued on page 124] Modern Mechanix and

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ROBIN 13 TO 200 MILES PER DAY TURNSTONE 2,000 MILES | OVER OPEN WATER 1 I 1 I E "o HAWAIIAN ISLANDS Photo Courtesy Chicago Academy of science 'Above——A map of North and South America with dotted lines indicating some of the record flights made by migratory birds. Inset—A pair of arctic terns and a fledgling. Terns hold the record for distant flights, flying 11,000 miles each way. VER unmarked airways, along coastlines, above mountain ranges and river courses sturdy wings are beating steadily to bring the most intrepid flyers of the airways, the birds, back to their northern haunts. The early arrivals, the robins, the phoebes, and the blue-birds are already on their way and, like a well-drilled army, other hosts will follow shortly. And the northland nesting grounds will again be filled with meadow larks, warblers, thrushes, swallows, swifts, martins, orioles, and countless other migra- tory birds. . It is a strange movement, this annual mi- gration of the birds. Man gasps in amaze- ment at some of the feats the hardy travelers perform in their semi-annual trips ranging from 1,000 to 11,00 miles in length. Even the. common robin and many of the other smaller birds make sustained trips of 700 miles with- out food, and the golden plover, flying be- tween northern South America and Labra- dor, goes in a direct route, 2,400 miles over the open waters of the Atlantic, without food or rest. The turnstone, another trans- [Continued on page 130] Inventions, April, 1935 coe their Migratory Trek SINGLE FLIGHT 700 MILES GOLDEN PLOVER 2,400 -MİLE NON-STOP FLIGHT ft os Photo Courtesy Chicago Academy of Science Above—Juncos and finches feeding around a trap. In circle—An upland plover on her nest near Chicago. The upland plover spends his summers in North America and winters in Argentina. SOUTH AMERICA ^. I I [| 1 i ARCTIC TERN w4 RECORD FLIGHT "Y 11,000 MILES BE- e| ~% TWEEN PATAGONIA R ÁND ALASKA Right—T he photo shows a bird enthusiast attaching a band to the leg of a young herring gull. The bands are numbered, and a rec- ord is sent to the gov- ernment Biological Survey telling the species of bird, the band number, and the locale in which he was found for future study.

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Duelists Break Custom; Shoot Selves In Target Practice A view of several members of the Southern California Col- lectors Association practicing on their life-sized enlargements. Toy Train Delivers Rural Mail a ECESSITY is the mother of invention." An Oregon rancher, living a mile from the highway, proved the truth of this old maxim when he put the world's smallest mail train in operation over a spur line between his home and the road to save his wife the trip. The train, powered with small dry-cell batteries, makes the trip to the road every morning, pulling a tiny mail box. Upon ar- rival, it is stopped by a lever laid along the track. The mail man delivers his mail and turns the switch to send the world's smallest mail train on its mile journey homeward. 78 UITE contrary to the ancient custom of duelling, the members of the Southern. California Colectors Association have evolved a bloodless version of the honorable art, using life-sized photographic enlargements of themselves as targets. One of the club members, a photographer by profession, struck upon the idea, and now the members are staging regular contests, shooting with old guns from their collections. A circle over the heart is the bull’s eye; concentric circles extending over the other vital parts of the body provide a wide range scoring basis. Folding Bed Sides Guard Baby COLLAPS- IBLE guard to prevent rest- less children from falling out of bed can be quickly clamped to the bed by means of thumb- screws. It folds and lies un- obstrusively be- low the mattress level when not in use as a safe- guard for baby. The collapsible bed-guard is quickly attached through the use - of thumb screws on the bed post. Ash Tray Protects. Cigarettes ANCID odors from burning cigarette stubs are said to be minimized through the use of an ash tray with separate compartments for the burning ash and the butt, preventing butts from smoulder- ing. A grid on the top prevents condensation of moisture on the cigarette when it is laid aside, and it scrapes off lighted ends to extinguish cigarettes. The grid on the tray is designed to avoid moisture condensation on the end of a burning cigarette. Modern Mechanix and

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Largest “Plane G arries “Printing “Press 2o WING SPREAD 210 FEET. OARING with all the power of its eight mighty engines, the huge Soviet Mono- plane, Maxim Gorky, the world’s largest land- plane, recently trundled to a stop at the Central Aero-Hydrodynamic Institute field in Moscow for its first public appearance. The Maxim Gorky, named after the famous Russian writer, has a wing spread of 210 feet —more than half the length of an average city block. Itis propelled through the air by eight propellers which are driven by high com- pression motors, three in each wing and two set in tandem over the passenger cabin. The : rear propeller is of the pusher type. The plane will carry a useful load of from seven to eight tons at a top speed of 135 miles per hour. It has accommodations for 70 passengers and a crew of six, and carries a printing press to spread propaganda. Design New Bicycle Speedometer O MEET the demands of bicycle fans, a speedometer for bicycles has been invented which resembles an automobile speedometer in most respects, registering mile- age up to 9,999.9 and speeds up to 50 miles per hour. The speed- ometer is fast- ened to the head of the steering bar by a bracket and is connected to a special gear on the front hub by a flexible tube containing the driving mechanism. The gear, which fastens on the front spokes, and the speed- ometer, can be attached easily by any boy. The new aluminum-finished bicycle speedometer registers mileage up to 9,999.9 and speeds up to 50 miles per hour. . Inventions, April, 1935 Here is the world's largest land- plane, the Maxim Gorky, shown at the. Central Aero-Hydrodynamic Institute field, Moscow, Russia. It is powered by eight motors and has a 210 foot wing spread. Air Silencer Tames Diesel Roar NSPIRED by'a tiny air-filter and silencer used in one of the country’s popular-priced automobiles, a manufacturer recently built what is believed to be the world's largest in- take silencer to tame the ear-splitting thunder of the Diesel engines of the new streamlined railroad trains into a whispering hiss. Although Diesels have heretofore used ex- haust silencers, the noise of the engine backed up and escaped through the intake manifold. The new silencer is now set into the intake manifold and has baffle-plates arranged to hold back the sound, at the same time allow- ing air to enter without retardation. The filter sieves and cloths keep all dust and dirt from getting into the fuel system. The idea for the huge Diesel air-silencer at the left was in- spired by the auto silencer easily held by the woman on the tight. It filters and cleans the air entering the motor. 79

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Odd Fins Utilize Up and Down Wave Motion to Propel Boat Left—The complete gear is shown ready for attachment to the model boat. | equipped, moving through the water. Right—The photo shows the model, completely The motion of the waves sets up vibrations in the fin impellors to force the boat forward. The front fins act independently and can be folded to boat sides. Metal Mask Gives Vapor Facials METAL face mask, shown at the National Inventors’ congress at Hollywood, is used to give steam or medical facials without the use of hot towels. The ingredients used for the facial are first placed in an electrical unit where they are heated to the vapor point. The vapor passes through a tube to the mask where it is emitted through numerous pin-holes in the lining. The metal mask is moulded to fit the face. Medical ingredi- ents are heated to the vapor point in the electric unit. Vapor Passes to the mask to be emitted through pin-holes in lining. 80 ESIGNED to transfer the up and down motion of the waves into forward energy, a new water craft, designed by a Californian is equipped with a set of light metal fins. The fins, which in tests have propelled an eighteen-inch model at a speed of five miles per hour, resemble the wings and tail of an airplane. The fore impellors rise and fall with the waves and transfer this energy to a for- ward propelling fin at the rear of the boat. Although greater speed is attained when the boat follows the wind direction, it can be steered parallel to or dead against the waves. Bottles Make Attractive Lamps CORD and socket given with each bottle of anewly manu- factured product affords the housewife a chance to make a decorative lamp out of the empty bottle. The socket replaces the bottle cork and supports a light wire frame over which the shade is stretched. Various pictures are furnished to replace labels. The bottles may be used as vases. A cord and socket are furnished with each bottle. Empty, the bot- tle makes an attractive lamp base. Modern Mechanix and

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LARGE ROYALTIES Offered Jnventors Cor Needed AUTOMOTIVE Jmprovements GLYCERINE ON WIPER DURING SLEET STORMS I ELECTRO-MAGNETICALLY CONTROLLED | LOCK FOR GAS TANK CAPS- prre inventions. neapolis, A CARBURETOR’ ATTACHMENT TO REMOVE WATER FROM GASOLINE OUNTLESS millions have been earned by smart inventors who have recognized the needs of the American motorist. The Moto- Meter, for instance, made a millionaire of its inventor within a comparatively short time, and the Bendix starter formed the foundation for a $50,000,000 business. Fortunately for those inventors whose minds gravitate toward auto mechanics there is still plenty of oppor- tunity to turn simple ideas into great amounts of cash, for our motor manufacturers are just as eager, just as alert for new ideas as they were twenty years ago, and the man with a new gadget is bound to receive friendly, pa- tient attention. We now have paint spray guns which fasten in a spark plug hole to operate on cylinder compression. What we need is a high-speed compressed air motor operating from the same source that will drive a polishing pad for waxing the car. Auto owners are still troubled with gas Inventions, April, 1935 Above ate illustrated a few of the needed automotive improvements sug- gested in this article as money making Secure advice on protect- ing your ideas by writing to the Patent Editor, 529 South 7th Street, Min- Minnesota. stamped, self-addressed envelope for reply. Do not send models. vy Wu zE ^ MOTOR. TO DRIVE - CAR: POLISHING EAD AN) ACCURA SOLINE GAUGE Enclose a PERFECTED "ONE SHOT LUBRICATION FOR ALL PARTS OF THE AUTOMOBILE thieves. An electro-magnetically controlled lock for the caps of gas tanks, which will automatically engage when the ignition of the car is turned off, should be worth $50,000 to the inventor. An oil filter for gas engines that would auto- matically discharge all foreign matter without attention would be worth a good sized fortune. Some years ago an automobile came to the market which featured “One Shot” lubrica- tion. The object of the idea was to supply lubrication to all points of the car by the manipulation of:a single handle on the dash- board, The idea was not successful because it was not developed properly, and there is still an urgent demand for such a device. Automobile ash trays would be much more serviceable if they emptied directly into the atmosphere at the base of the car. They would then never need to be cleaned out. This prob- lem entails merely correct design. [Continued on page 142] 81

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CREATING LIFE LIKE “death act.” HERE do the horrors in the wax mu- seums come from? This question may have troubled you as you paused in a side show for a few pleasant.shudders. So realis- tically are they made, so gruesomely exact in every tiny detail, that it would seem the artist must have had the original models pose ' especially for him. Let us visit a man in St. Louis who manu- factures these macabre specimens in his workshop. It surely will be exciting, and we may learn something in addition. Arriving at our destination, we opened the door with shivery anticipation— Instead of the ghostly, dimly-lit labora- tory-studio of cobwebs, shadowy corners and bobbling witches’ kettles—presided over by some evil-visaged, misshapen gnome, 82 Left—The artist takes the first step on a model of George Washington by molding a clay model. Only exposed parts are wax-—clothes cover papier mache body. Above—-Preparing a notorious western bandit for the Left-—The worker building up the back panel of a plaster. mold over the first clay model. Center-—Pouring the wax into the plaster mold. Right—Breaking the unfinished wax head out of the mold. It is now ready for hair and teeth.. © which we expected, we found just the oposite. A stout, jolly man of about forty-five, with a booming, cheery voice, bade us welcome. “How do I do it?” he laughed. “Come right in. Bill and I are just running off a cast of George Washington!” We stepped into a well-lighted, well equipped workshop. Bill, a soft-spoken young man of twenty-two nodded a greeting. Mr. Christophel walked over to a well ex- ecuted head of George Washington, sculp- tured in modeling clay. “This is the first step in making wax figures," he stated. “I’m just putting the finishing touches to it now. Next—" he reached for a bottle of oil. “I Modern Mechanix and

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Figures For WAX by HAROLD L. ZIMMER Washington, Roosevelt, Billy the Kid, Jesse James! All the world’s most color- ful figures stand out with startling reality in a wax museum. This article tells how workers transfer a simple photograph into amazingly life like figures sculptured in tinted wax. Right—The author, Harold Zimmer standing n wax models of “Wild Bill" Hickock at left and the famous fighter, Billy the Kid. Left-—Inserting the teeth and applying the finishing touches on the features. Center i Each hair is driven into the model with a pointed punch to g the eyelashes. gain natural appearance. Right—Human grease the clay head thoroughly, to keep it from sticking to the plaster. “People often wonder why the figures are so true to life. This is a compliment to the sculptor, for he seldom sees the original model —most of them being dead—and must go either by old pictures found in books or—as is sometimes the case—from a newspaper clipping. Figures of modern notorious char- acters and celebrities are often found in this way. “A wax workers art is not always gruesome," Chris continued, taking the fin- ished clay model over to where Bill was [Continued on page 122] Inventions, April, 1935 hair, each one individually inserted, is used to complete the model head of George Washington molded from special wax. — A silent electric, motor The breathing mechanism exposed. runs a reduction gear which is timed to conform with regular breathing. The machine can be regulated to produce the breath of a sleeping beauty or the gasps of a dying bandit. 83

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| Collapsible Masts Eliminate Heinen's dirigible is shown moored to his portable mast at Washington, b. C. Note the guy wires supporting stub mast. Invisible Wires Heat Garments IGHT sweaters can attain and surpass the warmth of the Eskimo's fur jacket through the use of a revolutionary new weav- ing process that incorporates fine copper or steel threads, five-thousanths of an inch in diameter, into the regular weave to heat the garment when plugged into a convenient elec- tric ontlet. The wires are covered with a special in- sulation that adds life and service to the gar- meni. Woven into airplane fabric the wires will be invaluable in keeping ice from form- ing on the wings. Left—A. sweater into which is woven thousands of tiny wire heating threads. Right—Rugs may also be heated by this method to aid in heating the house during the winter. 84 Dirigible Mooring Problems IGHT dirigibles receive a new practical value through the invention of a porta- ble mooring mast, by Anton Heinen of Lake- : wood, N. J., which will permit dirigibles to land on any suitable field and remain there any desired length of time. The mast consists of several lengths of pipes fitted one into another so that they may be compressed to fill a small space in the pas- senger car when not in use. To moor the dirigible when it is brought to earth, the mast is extended and set into a hole in the ground. The joints are held rigid by braces and the whole mast is set firmly in place by a system of guy-wires at- tached to stakes driven in the ground. Since a dirigible will not crash when the motor stops, this mast may make it possible for explorers to use this craft on their trips. Tiny Model Sloop Sails 25 Miles H. Ormsby Phillips is shown here with his record-making model sloop. The bottom of the boat was attacked by fish. CROSS a twenty-five mile stretch of open ocean, between Newport Beach, Calif., and Catilina Island in twelve hours and 35 minutes is the record recently set by the trim little model sloop owned by Ormsby Phillips, . Commodore of the Los Angeles Model Yacht Club. Inspired by the run, the club is organizing a deep sea race for models over the same course. The contest is attracting a nation- wide interest among model yacht owners, some of whom have built models which in some cases exceed a cost of $1,000. Modern Mechanix and

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Aero-Car to Cross U. S. in 12 Hours Delicately balanced on a single rail, the proposed Aero-Drive Monorail Ex- press, described in this ar- ticle, will speed across the continent at a rate in excess of 250 miles per hour. PILOT'S COMPARTMENT _ SPRUNG SIDE WHEEL ACTS AGAINST SIDE THRUST TUBULAR MAIN R AIL. FAIRING OVER. GUIDE WHEEL GROUND LINE \ N STEEL GIRDER SUPPORTS ANCHORED IN CEMENT OR IN THE SOLID ROCK -——- At top—The monorail express, unhampered by weather, could travel faster than modern planes. In circle-—-A cross-section of the passenger car. The guide wheels are mounted on shock- absorbing catriages which absorb all tendency of the car to sway from side-to-side. The main wheels are set in the middle of the car, and support it in perfect suspension on the single tubular rail. The rail is carried across the country on triangular steel girders sunk either into cement foundations or solid rock. Inventions, April, 1935 Above--The aero-drive, monorail express car speeding through the mountains. Powered by twin Diesel engines which drive triple bladed air screws, the car will travel at great speed without. being hampered by lack of visibility and bad weather, the present great aviation hazards. URTLING across the country at a 250 mile per hour clip through fog and heavy weather with perfect safety may be- come a common experience if plans for a giant aero-drive monorail express are car- ried out. The designer believes his monorail express could cross the U. S. in 12 to 14 hours, as compared to the 15-hour trip of present-day transcontinental air service. Built to cut the atmosphere at a high rate of speed, the cars are streamlined and ride a single tubular rail on deeply flanged pulley-like wheels. Guide wheels, mounted in shock absorbing carriages, follow sup- plementary tracks, automatically taking up all lateral swaying of the speeding car as it swings around the highly banked curves. The main and secondary tracks are sup- ported by triangular steel girders which can be easily and quickly set in any type of country. 85

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Electric Eye Trains Voices For Chorus ll - FOTO EREC TRIE Left—Members of the Newark Electro- Choir leárning a new song with the aid of headphones which bring a distinct melody as guidance to the singer. MAZING, almost human at its astounding task, is the photo-electric device invented by Captain Richard H. Ranger which breaks a melody into its component parts, soprano, alto, tenor, bass, and transmits them separate- ly to facilitate the quick training of singers. 'The invention is composed of a sound film with five different sound tracks which is: :passed around a drum before five different photo-electric cells. In front of each photo- electric cell is à small auto bulb and a lens. The lens focuses the light of the bulb onto the film, and the rays are then picked up by the cell on the other side which transmits the sound. Each bulb, lens, and photo-electric cell unit handles one of the sound tracks. Four of the tracks transmit the soprano, alto, tenor, and ` bass; the other transmits the melody as a whole. The singers receive their individual tone through a headphone while listening to the whole melody through a loud speaker. Thus, while practicing, each group can be kept in a separate room, hearing the melody only in its perfect form. A view of the new German engine as it will look when it is completed. Note the smooth "bullet" type lines. The vents in the cover side prevent overheating of moving engine parts. 86 Right—A view of the photo-electric transmitter. Note film passing between lens and electric eye. Rim Prevents Blow-Out Accidents ESIGNED to eliminate the hazards of a blow-out, a new inner-rim, off- set to half the size of an inflated tire, is firmly at- tached to the wheel itself. When a blow-out occurs, the auto- mobile drops to ride on the tire guard which is said to maintain a level course without swerving. The device not only lessens the fear of severe accident, but it also prevents rim cuts on punctured tires while stopping the auto. This inner-rim, designed to pre- vent blow-out accidents, is rigidly fastened inside of wheel itself. German Engine Uses “Bullet” Lines ERMAN locomotive engineers in follow- ing the streamline trend have originated a design for steam engines that is uniquely their own—following the lines of the high- speed, soft-nosed bullet. The engines, now under construction for the German Railway Company at the Borsig Works, are completely encased in a smooth metal cover, leaving only vented open- ings to prevent the overheating of the drive wheels. Modern Mechanix and

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Steel Plate Flashes Over Window To-Guard Holdup Victims TE leveled gun and the sharp cry of “Stick 'em up" need no longer strike ter- ror to the hearts of bank tellers since the invention of a new holdup guard which, when released by the pressure of the knee, flashes a heavy steel plate between the robber and. his victim. This new guard features a heavy steel plate, set above compressed steel springs and fitting into grooves behind the teller's window. The springs are held in compression by a trigger fastened to a release bar near the teller's knee. Slight pressure of the knee trips the trigger and flashes the steel plate before the window in a split second. This guard is.more practical than the con- ventional alarm as it can be sprung without tell-tale movement, and it affords complete protection from baffled burglars left with nothing but a bullet-proof wall as a target. ` Actor Plays Underwater Symphony Jack Holt, screen star, shown playing a piano in an under- water scene. A microphone hidden in the seaweed recorded the sound, a faint tinkle slightly resembling music. LAD in a heavy diving suit, Jack Holt, Screen star, gave vent to his musical emotions by playing a piano on an under- water movie set. This strange stunt was a feature called for in a recent movie and was recorded by a microphone hidden in the seaweed which hung over the instrument. The scene, illumined by unusual under- water lights was quite effective, but the microphone picked up only faint tinkles re- motely resembling music. Inventions, April, 1935 ~ i de KNEE LEVER — A mere pressure of the knee releases a trigger and sends a bullet-proof steel plate between the holdup man and his victim. Machine Takes Casein from Milk MACHINE which extracts the casein from cow’s milk has eliminated hand work from the making of glossy finish for papers, taking the milk in at one end and turning out the completely separated casein from the other. The machine insures the uniformity de- manded in the printing of modern advertis- ing. It washes the curds free of foreign sub- stances and presses them into cakes. The cakes are held in storage until needed. Balls Aids In Cleaning Dust Mop HEN the rubber ball, set in the handle of a dust mop, is struck over a window ledge, it sets up a strong vibration which shakes the dust from the mop. The ball does not damage the sur- face on which it is bounced. The rubber ball, when struck over a projecting ledge, sets up vibra- tions to shake the mop head. 87

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Professor Stays Home; Conducts Class With Two-Way Radio Left-—Dr. C. C. Clark lecturing by two-way radio to his science class (right) meeting in another building. TILIZING “micro-waves,” Marconi’s latest discovery in the radio field, Dr. C. C. Clark can lecture to his General Science class a quarter of a mile away without leav- ing the quiet comfort of his own home. A receiver in the class-room is tuned to the professor’s lecture, and questions are an- .swered directly as they are relayed over the two-way transmission by the professor’s as- sistant. Such a device will permit instructor to carry on his lectures even while sick and confined to his home. Rubber Telephone Cord Stretches A BAND of gum rubber, woven between the wires in the center of a telephone cord, gives it an elasticity which permits a stretch of four feet on a cord originally only one foot long. Small wires are packed into the rubber cen- ter like a spring to coil when released. Said to be equally as durable as the conventional cloth wrapped cords, the new type can be ex- tended to four times its original length. The rubber of the new telephone cord is interwoven with coiled springs which allow the user to stretch. the cord four times its original 88 length without any resultant damages. Trailer = = p Ir l G. Albert Spencer is shown standing before his traveling home which is constructed from lumber that he finished himself. ALBERT SPENCER, a student at the e University of Utah, lives in high style at low cost in his home-like trailer which he built for himself for use while traveling be- tween Paris, Idaho, and Salt Lake City, Utah. The trailer is 12 feet long and 615 feet wide. It contains two chairs, a table, a typewriter stand, stove, hat-rack, a clothes closet, and many other home conveniences. It is con- structed from lumber which Spencer cut for himself, and it is painted to resemble brick construction. First Class Mail To Go By Air VAST plan for carrying air mail was started in England recently with the an- nouncement by Sir Phillip Sassoon that all first class mail will be sent by air. First class air service to India, Australie, South Africa and Singapore will begin at once. Modern Mechanix and

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. Connect Distant Speaker To Radio Set With Only One Wire F AN additional loudspeaker is desired in the studio, playhouse, or barn, a single wire between the two points is sufficient, pro- vided magnetic speakers are used. The ground itself serves as the return wire. Locate the loudspeaker post which is con- nected to the plate circuit of the output tube of your set. Run your single wire from this post out of the house to the other speaker using insulators where necessary. A switch should be placed in series with this wire at the remote location, to enable this speaker to be shut off even though the radio in the house is being used. Ground the other termi- ‘nal of this speaker. The radio set itself must have a good ground. Place a 2 mfd. condenser in series with the single wire at the radio set, to pre- vent short circuits. Do not try this with sets having a dynamic speaker. Make Insulators from Old Tires "AERIAL: INSULATOR TRONG and | dependable insulators for aerial wires and mast guy wires are readily made from an old auto tire casing. Cut slices about one inch wide from the casing, and SECTIONS FROM TIRE CASING Make serviceable, no-cost insula- tors from auto tires as shown here. each just inside the bead. - Two of these slices are looped to- gether as shown in the sketch, and the wires then run through the holes. A single slice slipped over a large screw hook makes a good strain insulator for tying wires to buildings or posts, as in anchoring guy wires. There is no danger of breakage here. Inventions, April, 1935 punch holes in: wn? a m i | Renee A MILL MEL bed Above method of connecting extra speaker with only single wire applies to radio sets having magnetic, not dynamic speakers. Place s. p. s. t. switch near speaker as shown here. Jig Bends Sheet Metal Accurately ITH this easily built jig, sheet metal for radio cabinets may be quickly and evenly bent to any desired angle up to 90 degrees. Two boards are hinged together, with a wood clamp to hold the metal in posi- tion while one of the hinged portions is being raised. Use hardwood throughout especially if you plan to bend sheet steel. Metal panels are neatly and quickly bent with this simple jig. 89

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Hear All-W ave Though no plug-in coils are used, pro- grams down to 35 meters can be heard with speaker volume on this powerful long and short wave portable receiver.

Set your toolbox portable anywhere, connect up antenne, and ground leads, flip the switch, and take your pick of music, police calls, or amateur short wave broadcasts o'er the con- tinent. Switch for long or short antenna is on back cover.

GROUND ROTORS .. TO PANEL * USE PHONES FOR DISTANCE. | | MEG. RHEOSTAT | WITH SWITCH -

BN POINT anton / "i G PRONG ISOLANTITE SOCKET FOR GOIL NOTE i= USE RUBBER GROMMETS WHERE WIRES GO THRU CHASSIS Mounting of parts atop chassis is shown in above sketch. 90 IMPLY connect up the aerial and ground wires, and this powerful little receiver is ready to pick up stations anywhere in this country, on any band from 35 to about 370 meters, with good volume on the built-in midget loudspeaker. Take it anywhere—on a canoe, cruiser, or along to camp this sum- met—it doesn’t take much of an aerial to pick up stations on the broadcast band hundreds of miles away. Í An ingeniously wound coil covers four different bands simply by changing the set- * ting on a four point selector switch. There is none of the nuisance of carrying along plug in coils for the different short wave bands, and opening up the set each time you wish to change bands. Everything is built into the single tool box cabinet. Light weight B and C batteries give unusually long service, since the current drain with the circuit used is very low. Two dry cells supply filament power. Rain or snow have no threats for this sturdily built receiver. Its depend- -50 MMFD. BAND SPREAD g CONDENSER — 00014 MFD. TUNING CONDENSER 4.— 00012 MFD. MICA CONDENSER — — 5 MEGOHM RESISTOR 00012 MFD. MICA CONDENSER _ | MEGOHM RHEOSTAT REGENERATION CONTROL — AUDIO TRANSFORMER CONNECT TO | WIRE OF COIL Lo - — GRID CAP FOR '32 _-BASE OF TUBE SHIELO < 4 PRONG ISOLANTITE SOCKET FOR '34 TUBE LOW LOSS 8 MH, CHOKE L-GRID CAP y" FOR 34 Z- METAL CHASSIS -6 WIRE CABLE A

M 4 PRONG ISOLANTITE SOCKET FOR ‘32 TUBE Ordinary 8 mh. choke gives same results as low-[oss type shown. Modern Mechanix and

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3-Tube TOOL by P. M. OHLINGER ability makes it the ideal portable set for mining expeditions, explorers, forest patrol rangers, or even for interference finding. A phone jack is provided to permit headphone reception of distant short wave stations. When phones are used, the speaker is automatically shut off. i Though only three tubes are used in this set, the type '19 dual purpose tube raises the efficiency to that of a four tube receiver. Electrically the circuit is a '34 screen grid untuned r. f. stage coupled by choke and con- denser to a '32 screen grid regenerative de- tector. Resistance coupling is used between the detector and the first a. f. stage, which is one half of the '19 tube. Transformer coupling is used between first and second audio stages, the output passing through the phone jack to the speaker. A tone control is just another of the many i e > l features found in this circuit. It may be used 20 onm RHEOSTAT Bottom view of chassis shows how small resistors and condensers are supported by pigtail leads. Be sure none of patts can touch when set is jarred. Battery leads are pushed into socket in small bottom panel, then soldered. Make all battery leads long enough to per- mit opening of back cover as shown in top sketch. Batteries must be E .S MED, inserted at bottom exactly as 4 4 shown, in order to close box. Bolt CONDENS chassis shelf to box. Place wire SOLANTITE grill over speaker opening. Lead O®KET FOR ‘32 on cover (above) goes to '34 grid cap, and is marked A in sketch on page 90. USE RUBBER í GROMMETS WHERE -> CHASSIS zs 107 TO f SPEAKER 7 S : FS -— TONE CONTROL... A et A 8 MH. CHOKE... j.-—^ — —À — BANO SELECTOR k— ~~ SWITCH PHONE JACK ~~ --® ` £ TUNING CONDENSER © I BAND SPREAD CONDENSER Pv ud Inventions, April, 1935 BOX Portable either for selecting the tone desired or for cutting down background noises on local re- ception. i A 16" by 715" by 714” 22-gauge steel tool case is used as a cabinet. It presents a fine ap- pearance and takes very little machine work. METAL CASE LINE INSIDE WITH CARDBOARD BA SHELF FOR SET SPEAKER 2 DRY CELLS C BATTERY 554.100.000. eT SISTOR BOND ALL GROUND CONNECT- IONS TOGETHER WITH HEAVY WIRE INSTEAD OF SOLDERING TO THE CHASSIS à ] / \ ‘| MEGOHM REGENERATION CONTROL 91

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Selector Switch Permits Reception Of All Wave Bands On Single Coil Drill out the rivets that hold the handle to the lid. The box is stood on end and the handle fastened to the top. Bolt a sponge rubber pad to the bottom of the box to take up shock and vibration. Drill holes for the antenna, ground posts and volt-meter on the I$ TURNS 3280.0. 2f TURNS 32 $CQ. TIOKLER coll 13 TURNS 26D.CC. 35-70 METERS SQ S 10 TURNS 26 DCS. 2 70-110 METERS ooi, ete 22 TURNS 26D.CC. EE S te 110-170 METERS GRID COIL 48 TURNS 32 ENAM. 170— 400 METERS \ ]Z-AERIAL .__/20MMFO. TRIMMER Lı Z GONDENSER C. 5 MEGOHM RESISTOR ae - = 00012 MED. [Grohe 2 MFD. rear 92 ar eie ^om C 9 O o oo om” SWITCH = CHAS: B+67y 8-135 QO-4j A+3 | A-, C+, B- ^20 ONM stAT =~ GROUND : 5 Three views of completed set show how compactly parts are arranged. To slide out chassis, loosen screw on tuning dial coupling, then take off all other front panel control knobs. rear door. The front panel of the box must be drilled or cut out for the speaker opening and for the controls. The five inch magnetic speaker will fit in very easily. The inside of the box should be lined with cardboard to prevent battery shorts and to make acoustics better. A vernier dial is fastened to the control panel by its extended bolts. Then a bushing [Continued on page 128] Wind coil exactly as shown, spacing grid windings 4" apart. Circuit diagram is given below. Filament rheostat is adjusted . to control volume and regeneration. Filament meter should never be allowed to go higher than 2 volts. Use low-priced 3-volt D. C. meter. Aerial binding post is on back cover. Ground post, on cover, is not insulated from the tool box. SOCKET TERMINALS — BOTTOM VIEWS Modern Mechanix and

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| Gennis “Rules Apply to Indoor “Dart Game XCEPT for the fact that darts are used in- stead of balls, this fascinating game is played in the same manner as lawn tennis. Just as much skill is required to place the darts in the proper court areas as to return the ball in real tennis games. While designed here for indoor use, dart tennis may also be played out-of-doors. The game board is a piece of soft plywood 44’’x51” in size, finished in clear varnish. On this board is painted a layout of a standard tennis-court, with a 4” diameter black circle at the center to represent the net, and radial streaks of alternate colors to indicate failure to return the ball. The game is played as follows: Assume that able plays. MATERIAL- 3 SOFT PLYWOOD ' NISH INCLEAR VARH LACK ENAMEL Playing board is set up on tripod, darts thrown from distance of 8 to 10 feet. Score exactly as in tennis; apply tennis rules to any question- Make darts from wood dowels, nails, and feathers, ot pur- chase from local hardware dealer. MP FEATHERS: SHED TO- GETHER — "GLUED INTO DART DOWEL Iu ==... Mark out playing board on plywood as indicated above, then finish with enamel in colors marked. Tripod is shown at right. two players, yellow and blue, are playing singles. Suppose blue is to serve first from the left court. He is entitled to two darts; if the first is placed within Court B he does not throw the second. A dart in the black circle is net ball, and must be served over. If blue gets a dart on the white streak in B, receiving player must now place his dart on a white court area on the other side of the net. If Inventions, April, 1935 blue had landed on a red area, yellow would likewise aim for the red area. A dart on the wrong color indicates failure to return the ball. Darts outside the court boundaries are of course called outside. Play continues until one player fails to place a dart on the correct color inside the court boundaries. Blue alter- nates between courts B and D in serving, while yellow serves into A and C. 93

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Build @MCIDGET e"YCILLER' by WESTON FARMER PART I HIS midget car is a scale model of the famous Miller Dirt Track Special. Built . for Merril M. Madsen, of Minneapolis, Minn., dirt track racer and owner of a real Miller, it combines beauty and speed with simplicity of construction. The car shown in the photos is powered with a % h.p. Briggs and Stratton motor with a kick starter reached by raising the rear hood. . This motor develops a speed of 20 miles an hour. The plans and specification given, however, will do for the power head of an out- board motor or one of those washing machine motors that can be found most anywhere. Unlike most midget cars, the “Midget Miller" has a clutch and a gear shift for for- ward and reverse that is a simple arrangement of V pulleys and a belt. The car can stop, start, and reverse and come to a proper halt for traffic signals. The body of the car can be built. of sheet metal or of wooden molds with chicken wire and fabrikoid cover. The first step in construction is the frame, made of two oak stringers, 1"x4" and 62" long. These are joined by separators, as shown in Fig 2, with 2" No. 14 steel screws. The rear piece is molded as shown from 2"x3" fir. A tie rod of 14" cold rolled steel is threaded and fitted in a slot in the bottom of this rear tie piece to strengthen it. The nose piece may be of the dimensions shown in Fig. 2, which is sketched as a sug- gestion as to how to handle this part. 'This nose piece can be cast, or it may be built up of 10 gauge sheet iron, welded at the seams. Below—A side view of the ‘Miller Midget” racer. Balloon tires come with the wheels. The gear shift is a simple arrangement of pulleys and sliding motor block at rear.

94 Miniature copy of the famous Mil- ler dirt track racer, this midget has class, beauty, and speed, yet is easily built with common workshop tools.

Mt At right —Top view TREAD IS 30 drawing of midget racer. Front springs are fastened to nose piece block. Be- low—-A rear view. MODEL"T" BRAKE RODS <~ lif SPRING LEAVES FORM FRONT AXLE LEATHER- ENTE SEAT g^ FORWARD, REVERSE

SPRING Modern Mechanix and

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7

P.

IM i" mmn E HN NET A- Photo at right shows graceful lines of the midget. Front spring mounting and Model T brake rods used for tie rods can be seen. All parts, except wheels, tires, and motor, can be built up in the average home workshop. If the nose piece is built up, the spring perch should be an iron or steel block welded and bolted as shown. A hole for the foot of the Steering column is cut in the bottom plate. Steering is done with a Model T steering column given half a revolution so that the foot or dash plate rests on the nose piece instead of the usual dash- . board. Holes are drilled into the bottom plate so the dash plate can be fastened with bolts. The driver's feet and legs go under the front hood. They rest on the 16 gauge metal floor, extending from the front seat support to the nose piece. The rear axle is one-inch cold rolled steel [Continued on page 126] Construction of the frame and nose piece, shown here, is not difficult. Spring perch must be iron or steel for safety. odel T steering column goes through long hole in nose : piece bottom. Drill 2" holes for 1" steel rod rear axle. FIG. 2. FRAME. CONSTRUCTION. OF MIOGET MILLER. 16 GAUGE SHEET . METAL FLOOR © SLOT. IN NOSE poss PIECE. FOR STEERING COLUMN FES ROUND odel "Dirt Orack‘Racer

NOSE MAY BE BUILT UP-FROM 10 GAUGE COLD ROLLED d 1 THESE PIECES ^: JO GAUGE y) WELDED AT 7 SEAM: P M Ge - TAPER 2 DETAIL OF NOSE PIECE AND FERONT - - SPRING PERCH

FOR MOTOR SLIDE PLATE Í STRENGTHE ING ROD - 2" HOLES FOR AXLE FRAME OF OAK itx at s < HEAD. SCREWS

'SPRING , PERCH:

Inventions, April, 1935

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f Flow to SELL Your SHOP PRODUCTS 5€... MATERIAL COST 3.254.LABOR 4.125. PROFIT 12.375., -PRICE TO WHOLESALER, 61:51 WHOLESALERS $ “COMMISSION 375, PRICE TO RETAILER, 6625... RETAILERS PROFIT ® 25000... RETAIL PRICE Once your workshop prod- uct is on production basis, and net profits are satisfac- tory, contact wholesalers and jobbers. Using sales- men with cars to deliver to dealers is another method of boosting your profits. Pay for labor on a piece- work basis, not by hour. by DALE R. VAN HORN 'HE owner of a home workshop which is well equipped with power tools can at any time utilize his hobby as a means of making a living. At his disposal is all the equipment needed to go into the production of toys and novelties which will find a ready market everywhere. In any home shop venture, regardless of what type of product is being made, there is just one sure way to figure costs and profits. Get quotations on materials you need from as many manufacturers as possible to get the lowest possible price consistent with quality goods. Let it be known that you plan to go into production, and you will be given whole- sale quotations. From these figures, compute your material cost per unit, allowing about 10% for waste and breakage. The labor cost is an uncertain figure until you have made several hundred items, so figure liberally at first. Remember that any worker naturally speeds up with experience. This labor item, added to that for materials and a pro-rated amount for electricity, machine depreciation, and supplies, gives you the actual cost of the item. 96 Supposing the total in this case comes to 8.25 cents. You are entitled to a 50% markup as your own profit, Adding this, 4.125c, to the cost makes 12.375c, the lowest figure at which you sell the items in any quantity. You can give this price to salesmen or jobbers. To retail dealers should be added 331596 of this figure, bringing the dealer's cost to about 19 cents. Dealers, in turn expect to make at least a third, and 40 to 6095 suits them better. If you also sell your own products, then into your pockets goes both the manu- facturing and selling profits. Selling Price to be Four Times Cost All this is simply a long way of saying that if the item costs you 8.25c, it should retail for at least 30c. This plan, providing the item in question will sell at this figure, will insure the proper profits along the line. Once you have become established on a firm business basis, keep in mind that the only sure way of controlling your labor costs is to operate on a piece-work basis. Here you pay your help so much for a certain amount of work, your labor costs for any one piece be- ing always the same. Keep in mind these simple rules for set- ting prices on your workshop products, if you want to reap the full benefit from your labor, your ideas, and your equipment. Modern Mechanix and

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AUTO GENERATOR KINKS ‘Use Generator as Reactor for Electric Arc Furnace CIRCUIT DIAGRAM ARG LIGHT ARG? wovours ac, | CARBONS N ELECTRIC arc furnace which will operate directly on 110-volt alternating current must have a re- actance in series to limit the current when the arc is struck. The field coils of any automobile generator will prove ideal for this reactor. Remove the armature and brushes, then either bring both field coil leads AG i AND ARMATURE ` out directly, or ground one to the P» : ATOR generator frame and bring out the other. Connect the coils in series with the carbon are rods across the power line. An inexpensive furnace for heating brass, bronze, or lead may be constructed as pictured in the sketches at the right. The electric are is intensely hot, and will prove very convenient for melting small GENERATOR: = PAN FILLED FIELD COILS (NS pirum WITH SAND quantities of metal. This reactor may also be used | 299? GROUNDED TO for an arc light flood lamp.—Carrol R. Whitehill. Electric Motor Helps Charge Car Battery HEN your car battery is down, here’s a kink that will bring the battery up in a short time. On a small board mount an electric motor having a V-belt pulley. Remove the fan belt from your car engine, and connect electric motor and car generator together with it. The length of the board should be such that , the weight of the motor tightens the belt. The am- meter will tell you if the generator is being turned in the correct direction.—R. F. Jennings. Ito VOLT: AG. E High Speed Auto Polisher Uses Any Starter Motor OLISHING and waxing of a car, if done . by hand, can be a very tedious job. With this starter motor-powered buffing wheel operating directly from the car battery, a bril- liant polish may be obtained in an hour. Turn down the armature shaft to take a standard 6” buffing wheel. Two handles are fastened to the starter in the manner in- dicated by the sketches. Connect the starter to the battery with long, flexible No. 14 rub- ber covered leads. A heavier wire would draw more current than is needed here. A switch may be mounted on the starter if A E ERSTES desired.—Lawrence Kay. AND THREAD 6, e E (SESS Inventions, April, 1935 97 BAND IRON HANDLE rx Lx 9" FASTEN TO ASSEMBLY BOLTS BN WELD 1" PIPE LONG v i" X 4t BEARING.

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Alli] PLASTER Newsies Wah Clann Fruit bowls, book ends, and plaques like those shown above are easily made in quantities from plaster composition by flexible molding process described in detail in this article. N THE making of plaques, statues, book ends, or other plaster novelties on a pro- duction basis, a knowledge of flexible mold making will prove invaluable. Model makers, too, can save time and money with these gela- tin molds especially when large numbers of an intricate plaster fitting are needed. Molding gelatin has many of the charac- teristics of rubber, being flexible, elastic, and tough, yet it will melt at a temperature even less than that of boiling water. The gelatin may be used over and over again by remelt- ing. The making of the form is the first step in this new molding process. The model being copied is glued flat side down on a smooth board or piece of tin. With strips of wood or tin set up a form about 4” higher than the model and at least 34" away from it at all points. Cement down the outside edges of this form with a thick mixture of molding plaster and water, and allow to set. If the model used is painted, give it a coat of clear varnish to protect the finish. If it is marble or a plaster composition, warm it up a little before pouring on hot gelatin, to ' prevent cracking. The molding gelatin usually comes in flat slabs about 144” thick. Cut this up into 144” 98 GELATIN MOLO .away from the model. FiNISHED PLAQUE PLASTER MOLD EN Above—Plaques may be easily lifted out of gelatin molds, and mold used over and over again. Below— Model in form is ready for pouring with molding gela- tin. Metal form is backed up by plaster mixture to prevent loss of gelatin. squares, and melt in a double boiler. Allow the water to boil slowly until the gelatin is thoroughly melted, but do not allow the gela- tin itself to boil. Pour the gelatin slowly over the mold, al- lowing it to level itself to prevent formation of air pockets. Allow several hours to cool. Now remove the form, and pull the gelatin With room tempera- tures of less than 50 degrees the mold may be used just as it is, if the plaster is mixed with cold water. In warmer rooms apply two coats of a slow-drying varnish to the inside of the mold. When you are ready to start molding, grease [Continued on page 120] Modern Mechanix and

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: Midget Mechanical Man Wags Head To Answer Questions -— SQUARE, (CUBIC) lity] EYES AND EARS (S) (&) ARE DRAWER KNOBS 2 li | 2% CUT SLIT THRU HEAD FOR MOUTH ALL BODY PARTS ARE GLUED TO- GETHER n IZSQuare [f pon LEGS ARE LUE 3$ SQUARE ee ABOUT 2"LONG OF’ MATERIAL Glue together parts of body (above), then shellac, sand down, and coat with aluminum paint. Drill hole in neck for head control wire. Place washer between head and neck. Radiator Cap Is "Flying Goose" LIVELY and amusing ornament for your auto radiator cap is this grotesquely modernistic flying goose design. Suspended on a thin spring steel perch, the bird flaps up and down fascinatingly as the car speeds along. Transfer the pattern of the body to 34” white pine and cut out on a band saw or by hand. Sandpaper thoroughly, enamel a glossy black, then insert bright red buttons in the eye sockets. Cut the wings from sheet alumi- num, buff to a high polish, then screw to the body. A sharp drill turned slowly will make mounting holes in the length of clock spring used for the perch. BOL DUCK PERCH Fr LATE RT TRAIT EMOTE EIDE AND CUT FROM % Wooo eS CCT ARN Above squares make transferring of goose patterns to work- ing materials easy. Stiff clock spring may be used for perch. Inventions, April, 1935 p MOVE - MENT — S S WEAK SPRING RUBBER BAND: THREADS -> IRON ROD IN LEG, LIGHT ENOUGH TO ALLOW ARM TO DROP OF ITSELF NS N NS With arm up- raised in salute, "Doremus" poses for picture. Fin- ish him in alumi- num bronze, to give him that much-desired metallic robot complexion. UTNE o > m TLL UL aie : U N TABLE] Secret of mag- & EY Ej S netic personality AAT) wei ek MUIE: MAGNET-WITH WIRES mmm yp FROM IT TO BATTERY E— he AND PUSHBUTTON CON- TROLS ACTION à TO TOM OF TA ius m! 1 LITTLE wood, a dash of aluminum paint, and a lot of concealed hocus-pocus, as- sembled as shown above, make Doremus—a vest pocket edition of that strange, awe-in- spiring scientific oddity, The Mechanical Man. He can count to eleven, wag his head in an- swer to any question put him, and even whirl his one free arm around, windmill fashion. Doremus operates by means of electro mag- nets kept out of sight, under the table top or hidden in the base on which the robot can be mounted. The magnets can be taken from a door bell and connected to batteries and separates switches mounted under the rim of the table. It will be necessary to experiment with the counterbalances inside the legs to get them just the right weight and distance from the magnets to turn the arm and head. The short lengths of iron rod are suspended with waxed threads from levers in the hollow trunk of the figure. That attached to the arm lever must be light enough to allow the arm to fall of its own accord. A small spring re- turns the head to normal position when the magnet operating it releases, Make pin pricks in the top of the table to indicate where the magnets are located. 99

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Boy-Power "STEAM SHOVEL" oy -Power Shoveling sand in summer, snow in win- ter, this boy-size "steam shovel" is a year "round source of fun for the mechanically inclined youngster who craves action. by RALPH T. MOORE IKE the giant steam shovels used in cut- ting out highways, this boy-powered shovel digs into miniature sand mountains, pivots about realistically to re- lease its bucketful of earth over a waiting toy truck or railroad gondola car. Hands and feet of youthful operators must move in . coordination as boom and dipper are maneuvered back into posi- tion for another “bite” at the back-yard sand pile. Winter brings no period of rest to this sturdy shovel. Watch CONTROLS Vax MAX 14" SINON = h ee À the one-thousandth cubic yard LEFT DRUM || 3 1 AN BOLT» capacity dipper scoop up snow cB al | fll A 2 WANDLE aN from the sidewalk, pile it neatly aN bx] * pore to one side of the path. MIWA SHER The position of the boom is WASHERS ‘BLOCK controlled by the lever at the top = of the cab, and may be set at BUCKET DUMP CORD LEVER , SP DS EE l EIC four different heights. The slid- ing movement of the dipper in- side the boom is taken care of by the left control crank, and the forward motion of the bucket by : ; the right crank. Turning is done SCREW-EYES Ss SR with the feet, the rear wheel AND AROUND 4. being pivoted. WINCH DRUM, THEN putet. VEI AUT T =í Plywood, a few scraps of soft WINCH - CAM : DETAIL. Details of construction and assembly of steam shovel are covered in above sketches and photos. Control winch, on right side of cab, has locking cam which holds up the dipper. LEVER BRACKETS. Eoc 100 Modern Mechanix and

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Moves Miniatue MOUNTAINS pine, some pieces of sheet metal, and a few odds and ends of wire and bolts are the only materials needed in con- structing this shovel. Build the dipper or bucket first, as- 'sembling the plywood sides with glue and brads. Cut two hinges for the door from 20-gauge sheet metal, bend- ' ing as shown in the sketches. The dump lever is cut from the same ma- terial, and fastened to the dipper door with small wood screws. A small spring fastened to the dip- per keeps sand from forcing open the bucket door. An 11” length of stiff wire is bent to form the dipper bail; this snaps into place. Saw out the base board, the seat, and the front wheel bracket arm Here’s how the completed shovel will appear. Bucket release cord is held in hand. Boom is at highest position here. PULLEY OF SPOOL ENDS ON 3% DOWEL ieee Mies % 5/5, n AND 297, DETAILS OF BOOM ALL * STOCK from 1" stock, sanding the edges and then drilling as shown. The wheels may either be cut from 144” stock on the band saw or turned out on a lathe. Wheel brackets are %xanx7 formed from 1%” thick strap iron. SEAT BLOCK —.— Use strong chalk line in rigging the shovel. Mesa de NCh ee none E Small screw eyes serve as guide pulleys. Red, black, and E REESE for the T Two coats of paint complete the shovel. Inventions, April, 1935 ' 101

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SEASONAL HOME SUGGESTIONS 3 v Clean Chimney With Small Pine Bush HE annual chimney cleaning is often neglected fe wo s- Hooks (REP S SS by home owners because of lack of special V4" x | STRAP IRON c EN equipment. This need not deter you from remov- i 4 N SON shown.—J. Gilbert. Glycerine Renews Typewriter Ribbons Y APPLYING a few drops of glycerine from time to time, type- writer ribbons can be re-inked and used over and over again. Simply wind the ribbon onto an old spool having the bottom removed, and set into a metal can with the ribbon ends touching the bottom. Place 3 or 4 drops of glycerine in the can, then close tightly for one day. The glycerine filtersevenly through the ribbon by osmosis.—F. Bunce. Wee Burglar-Proof Door Lock HEN the kitchen sink is clogged up, and no plumber’s force cup is handy, a half grapefruit skin will serve just as well. Exert rapid pressure on the skin after placing it over the drain opening, just as when using arubber cup. The pres- sure forces air through the drain.—A. Williamson. ERS erence oc Put Rubber Pads Ten in Skate Shoes KNEELING RAD. Chester Sullivan. ing the winter's accumulation of soot, for a small pine bush dropped up and down the chimney a few times at the end of a rope will do the trick. The bush should fit snugly when pushed, tip first, down the chimney. It may be necessary to weight the bush with stones if it jams before reaching the ' bottom. A safe ladder hook for roof work is also OLD i TYPEWRITER RIBBON Iw Z ., SOAK=12 TO AANA HOURS. IDE or back doors of the home, usually locked from the inside, are easily made burglar-proof. Lock the door, leaving the key in the lock. Now bend about a nine-inch length of stiff wire, such as that used for coat hangers, into a hairpin loop which can be slipped over the door knob and through the hole in the key handle. This prevents anyone from pushing the key out from the other side.— TO CLEAN DRAIN — RT PRESSURE. ON GRAPEFRUIT SKIN KATING shoes can be made more comfortable by placing a strip of sponge rubber under the laces, but over the tongue of each. Shoes can be laced tighter, yet there will be no cutting into the ankle. Weak ankles are better supported when the pads are used. Use 2” wide strips cut from kneeling pads sold at dime stores.— 102 Modern Mechanix and

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Make AUTO REPAIRS with Plastic RUBBER WRAP WITH RUBBER BANDS— — APPLY RUBBER CEMENT — — PLASTIC THEN PLASTIC RUBBER Zita ———_ Ff Pd ROS UY] d Ls aN PAX K_ [Se : E CLEAN POSTS AND TERMINALS WITH HOT WATER- THEN GASOLINE REMOVABLE PLASTIC RUBBER HOODS COVER SPARK PLUG CONNECTIONS Many auto troubles can be prevented by timely application, of plastic rubber, inexpensive material sold at dime stores ‘in kits which include tube of cement and sandpaper. It is used extensively for repairing soles of shoes. Corrosion of storage battery terminals is effectively checked by building up air-tight, acid-proof hood over terminal posts as shown. PLASTIC RUBBER HOODS FOR EACH eo LEAD OF DISTRIBUTOR - CAP y oy Plastic rubber is easily molded over any clean surface, making strong, water-proof covering. Damp-weather ignition troubles are checked beforehand by building up rubber hoods over all exposed high-tension connec- tions. Cover each spark plug, working rubber around insulation of lead wire for about one-half inch; repeat for each distributor lead. Rubber can easily be pushed off when replacing or repairing spark plugs or leads. OTHER AUTOMOTIVE USES FOR PLASTIC RUBBER: ——————— ——— |. GASKETS 8. STOPS LEAKS 2. WIRE INSULATION 9. STOPS RATTLES 3. FAN BELT REPAIR Io. TIRE AND TUBE f TT on Hoop -— 4. MOTOR MOUNTINGS REPAIR 3H BEADING FOR 5. WINDSHIELD WIPER “IY SQUEAKS 6. STEERING WHEEL GRIPS 7 WATER PUMP WASHERS PLASTIC RUBBER USED AS GASKET FOR RADI- ATOR CAP A Annoying squeaks in car may be stopped with plastic rubber. If windows rattle, build up sufficiently thick layer of rubber between glass and frame to take up motion of glass. Worn door stops are built up in few minutes without removing old rubber. Plastic rub- ber is ideal gasket material for water system in car; follow directions carefully to insure that rubber will adhere to metal. Neat roof top repairs may be effected by spreading on thin layer of the soft rubber. Inventions, April, 1935 103

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Rack Hangs Inside Closet Door to Increase Storage Space HAT ROD (MAKE THREE) HOLDER ps à P XT 2 S Q4 HOLES FOR Ps o : DOWLING fe y 2 stocky A ae N e Above—Details of the hat and shoe racks. Right—Starting from the top, the hat racks are placed one foot apart. The shoe racks at the bottom are inserted at eight-inch intervals. The bolts holding the racks to the frame should be loose so that the individual racks may be folded when not in use. BOUT a dollar's worth of lumber and a few hours in the workshop will produce a sure cure for the average crowded closet in the form of a handy tie, shoe, and hat-rack that is accessible, though suspended out of the way—on iron straps behind the closet door. The average rack, 6 ft. long by 2% ft. wide, can be constructed of about 50 ft. of 2 in. by 34 in. stock which can be bought cut to di- mension or cut in the workshop as desired. Other necessary materials include twelve 214 in. by 4% in. round-head bolts with nuts and washers, four lengths of perforated strap iron, ten cents worth of 1% in. flat-head screws, and about six ft. of % in. dowling. The frame, a simple rectangle, is con- structed of 2 in. lumber. It is kept from wob- bling by the racks. The racks are built to the desired size and fastened inside the frame at regular intervals with the 214 in. by % in. ‘bolts. They are supported by braces fastened to the front of the frame. Sponge rubber balls are cut in two and placed on dowlings for hat holders, and a bar across the tilted shoe rack catches the heels to keep the shoes from falling. FORE - Above—A view showing the room before the installation of the new closets and window seats. Right—-The same room after the closets were installed. The partition is made of plas- ter board fastened to two-by-three inch stud- ding. This project in average sized room can be completed at an approximate cost of $35. 104 z RUBBER BALLS CU BAIN TWO | ae z 4-KNOBS ARE SPONGE P IRON STRAPS FASTEN TO INSIDE OF DOOR pels HOLES - STOCK FROM END Ww A BY RE à SHOE RACK e enisi HAT Fit Window Seat Between Closets- HE problem of inserting closet space into a rectangular room without producing an unbalanced bulk of blank wall in the corners is easily solved at small cost by partitioning. off the window-end of the room to make two closets and a comfortable window-seat. Using 2 by 3 inch studding covered with common plaster-board and buying the casings and doors to fit, this project can be completed in the average sized room for about $35. If convenient, the window seat may be equipped with grills and used to cover an unsightly radiator, or doors may be hung in the wall underneath to afford the housewife extra storage room.—Mrs. W. J. Wade, De- cember Home Improvement Contest Winner. Modern Mechanix and

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MAGNIFYING CAMERA Takes Insect Photos by PAUL W. GARTNER ITH this simple magnifying camera the actions of tiny insects, enlarged many times on the ground glass screen, offer a fasci- nating field of study. By replacing the glass with a film, pictures of these insects, or of any other small objects such as pins, printing, or stamps can be made. The barrel of the camera is built up of light boards assembled with light-tight joints Paint _the inside a dull black before assembling. The camera described here has an 8-inch focal length lens, but almost any good lens will serve the purpose. Here again the lens setting must be light-tight. The lens may be fixed solidly, since focusing is done by mov- ing the subject. The 6"x6" dimensions are suitable for a Inventions, April, 1935 Insects will be ín focus at from 10" to 15" in front i of magnifying camera lens. Two strong lights with reflectors will provide sufficient illumination. il DIMENSIONS |l] DETERMINED Ab 2 BY SIZE OF 4 JI GaoUNDGLAss ZA” BACK USED. METHOD OF CONSTRUCTING BOTTOM CLIPS OF BRASS STRIP $ WIDE Barrel 6" square will take 4"x5" ground glass screen. Glass is easily replaced with film if back of old plate camera is mounted at end of barrel. Glue strips of velvet to contact edges to maintain light-tight joint between camera and box. 4"x5" ground glass screen, which should be removable so that plates or film may be in- serted in the same plane of focus. The magnifying camera requires two per- sons for its operation—one to move the sub- ject, the other to watch the screen to check focus and centering. The depth of focus on a camera such as this is very slight—only a fraction of an inch—so it is not likely all parts of an insect will be in focus at the same time. The lens may of course be stopped down and a time exposure made, to increase the depth of focus. 105

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Unfolding the e7YCysteries by SAM S. RABL Naval Architect FIG. 3- PORTION REMOVED |] 3 SHOWING A BUTTOCK PLANE O THE seasoned boatbuilder the terms used by a naval architect in describing the design and building of a new boat have a world of meaning; to the beginner they ean be as puzzling and in- coherent as a foreign language. Laying down is the term applied to the process of enlarging the small scale draw- ings of the architect to full size; this must. be done before a single timber can be cut for the boat. Taking off is the term applied to the transferring the curves and Sas oe dimensions on this full size plan to the frame timbers of the boat. Before we go into the mechanics of the AT CENTER D SHEER LINE WATER LINE D —X STATION LINES TRANSOM WATER LINE FIG.2 _ LINES AS SHOWN IN Fic. | BELOW E Wo j WATER LINE EL E. 7 j BUTTOCK LINE : ‘ 4 Wy, } E Ss q = 3 i FORWARD à I x à z S PERPENDICULAR — "es, Phantom drawing of a typical boat, shown in Fig. 2, gives indication of positions of lines used in dimen- .sioning. Base line is reference line chosen arbitrarily, and usually passes through lowest point on the keel. WATER LINE STATION LINES SSS FIG.4 -PORTION REMOVED SHOWING A WATER PLANE" Yi, rp zr rk TRANSOM . |. FWD. FRAMES AFTER FRAMES |’ CENTERLINE . BODY PLAN FORWARD PERPENDICULAR TER I FNIT Ge | fy 7/ Fic. f SET LINES OF A ROUND BOT TO! BOAT AS THE ARCHITECT. LAYS THEM IN HIS DRAWING -WITH | EXPLANATORY TERMS APPENDED These three views—profile, body, and plan, are sufficient when accompanied by table of offsets, to give all information needed by experienced boat builder. In process of "laying down” these views are enlarged to full size on shop floor. 106 : Modern Mechanix and

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of BOAT Plans To one planning to build his first boat, the plans and specifications of the naval architect are a maze of hieroglyphics— a discouraging stumbling block. This ex- perienced designer here explains how: to follow boat-building plans properly. actual laying down, an explanation of the terms used in this process will be a great help. The complete set of curves that depict a boat shape is called the lines. The lines plan is usually divided into three views. The pro- file depicts the shape of the boat as we see her from the side in normal position. The plan. is really a "fish-eye view,” showing how the boat appears when looking at her from a point directly beneath her keel. i SHEER 3 WIDTH WATERLINE Vo WIDTHS CHINE HEIGHT zc] J 2 NN I . FiG.5 TYPICAL "V" BOTTOM LINES SHOWING PROJEC Lay out full size plans on wrap- ping paper before cutting lumber. The body plan shows the boat as she would appear if we were to look directly at the ends. This plan is usually drawn with the forward frames on one side of the center and the after frames on the other. The two sides of the hull are seldom drawn, as the shape is supposed to be symmetrical The lines which represent the frame or mould ` positions are known as the frame lines or sta- tion lines. Examples of each view are shown in the sketches accompanying this article. All vertical dimensions on a boat are usually DE SENN Mae eee TL——A——M—— M SR NNT PLAN : TION OF THE BODY PLAN V-bottom boats offer slightly different building problems from round-bottom craft, but three views are still sufficient to represent the boat. tions, is shown above. are shown in Fig. 6, above. Inventions, April, 1935 Typical table of offsets, giving dimensions with reference to the base line and center line at different sta- Dimensions are given in feet, inches, and eighths. 5-8-2 is then 5’, 814". Meanings of sheer and chine LWL is low waterline, where the boat should float when empty. i Base line is reference line. 107

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Make Projections from Full-Size Plans to Check Fairness of Lines given with reference to the base line, an arbitrarily chosen line passing the length of the boat just under the keel or lowest. point. On plan views the projection of the base line is always known as the center line. Any horizontal cut through the hull parallel to the base line forms a plane which would be called a waterline if we were referring to its boundary or a waterplane if we refer to the entire plane. If on the other hand we were to make a cut through the hull in a vertical plane parallel to its centerline we would form a buttock and buttockplane : or vertical plane. In some old books we may find what we term the buttocks today divided into two classes of lines, The forward portions were termed the bow lines, and those at the stern end buttocks. A diagonal cut through the hull lengthwise with one edge parallel to the centerline is termed a diagonal; this type of line is often used to give measurements which, be- cause of curves in the hull, would be incon- venient to give on either waterlines or but- tocks. | \ In the preliminary examination of a set of lines a good rule to remember is “Waterlines always appear as straight lines in the profile and as curved lines in the plan. Buttocks always appear as curved lines in the profile and as straight lines in the plan. Station lines appear as straight lines in both profile and plan. Waterlines and buttocks as well as diagonals appear as straight lines in the FIG.7- PROPER WAY TO TACK DOWN A BATTEN FOR DRAWING CURVES These “laying down" methods are used for round bottom hulls. PROFILE NOTE.- SHAPE OF TRANSOM 1S ELONGATED. TO MAKE DIAGRAM CLEARER SEM - L4 PROJECTION OF W.L.ENDS «OF Bi uu En Ten) a or B » BOAT-BUILDER’S DICTIONARY LINES—set of curves giving shape of boat. PROFILE—view looking at side of boat. PLAN—view looking at bottom of boat. BODY PLAN—view looking at end of boat. BASE LINE—arbitrary height reference line. CENTER LINE—reference line for widths. BUTTOCK—line through hull formed by vertical slice parallel to center-line. WATERLINE--line through hull formed by horizontal slice parallel to reference line. OFFSET——distance from either reference line. BATTEN-—wood stick used to draw curves. TRANSOM —stern end of boat (usually flat). SPILING—transferring planking curves. STEM-—curved frame piece at bow of boat. SHEER-——highest line on profile. CHINE-—-intersection of sides with bottom. 108 Modern Mechanix and TRUE SHAPE OF TRANSOM THESE DIMENSIONS ALSO SHOW IN FIG.9 * BODY PLAN PROJECTING THE TRANSOM

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Keel and Stem of Boat May Be Accurately Laid Out from Large Plans body plan while station lines will appear curved.” The foregoing rule applies to boats with full curved sections, shown in Figures 1 to 4. The “V” bottom boat presents a slightly dif- ferent problem but the lines are much more simple. An examination of Fig. 5 will serve to explain them. Fig. 6 shows how measure- ments are taken on the curved frame “V” bottom craft. The architect in making the lines plan of a wooden boat always works to the outside of the planking. This should be the rule un- less it is positively stated on the plan that the lines are to the inside of the planking. In drawing the plan the architect uses a pre- determined scale; usually 34" or 1” repre- sents 1 ft. on the actual job. To give measurements on the lines the architect either furnishes a table of offsets or gives the measurements directly on the plan. An offset is either the distance a cer- tain point is from the centerline in case of widths, or above the base line in case of heights. Vertical offsets are sometimes taken above and below the load waterline. Offsets are also given along diagonals... Almost invariably offsets are given in feet, inches, and eighths. Thus 3-7-5 when trans- lated will mean three feet, seven inches and five eights, or 3’-75g”. A rule to remember in reading offsets is that half widths are given out from the centerline, and heights are given with reference to the base line or load water line. [Continued on page 118] THIN BOARD (SP/LING BOARD) LAID ON FRAMES DIVIDER PRICK oe OR ‘TICK’ MARKS SS a Te ne DIVIDERS -

I.

ARCS SWUNG FROM DIVIDER TICK MARKS ON SPILING BOARD

BOARD TO BE FITTED 2. TRANSFERING CURVE To PLANK Method of transferring curves from partly finished boat to next piece of planking is indicated above. Planks should fit perfectly without need for excessive forcing into position. Keep dividers at right angles to plank already on boat to get the correct distance. Inventions, April, 1935

RABBET BACK RABBET TYPICAL KABBETED KEEL & STEM PIECE: CUTWATER FACE ON STEM PEE STEM JOINT

ims | FWD. EDGE <A OF STEM Bis SHOWING HOW| KEEL & STEM SECTION ARE OBTAINED FROM FLOOR LINES f SIDING HALF ø $ L Zl P CUTWATER FACE

CENTER LINE FIG.12 TAKE OFF SPIDER

BEND TOLINE AND NAIL TO FLOOR LINES ON FELOOR h BOARD IN MA PLACE UNDER , Jf SPIDER READY FOR MARKING OFF

109

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HANDY USES FOR SHOP TOOLS Align Dowels Accurately With Wood Jig ES ARE DRLLED THRU R Mp ERFECT joints can be made with wood even ONED | .— 77 ye though no standard dowel hole boring jig is available. Make a wood template containing the dowel holes in their proper locations, as pictured in the sketch, using either a steel square or a drill press to insure that the holes are perpendicular. To use, lightly nail the template to one side of the joint, bore the dowel holes, then nail the opposite side of the template to the other joint and repeat. Dowels will now fit perfectly.—K. E. Frick. — —— File Cleaners Made of Copper Tubing ILES often become gummed up with lead or other soft metals. Short lengths of copper tubing which are flattened | FLATTEN WS at one end make very serviceable cleaners, the flat end being S His? rubbed over the file in the direction of the ridges. The rounded tubing makes a comfortable handle to work with, and the tool is easily carried in the shop kit.—(G. E. Hendrickson. — d Ses Ro. | a, Rewind Stretched Springs Without Lathe OIL springs of any desired diameter and spacing An D are easily wound either from old springs or from DECR j^ AREE meen) wire in the manner shown in the sketch. . The angle m È of the wire before it is squeezed between the wood blocks determines the distance between turns. C DISTANCER BETWEEN clamps may replace the vise. A pipe wrench may also AMAA be used on the rod.—Robert Macgregor. Holder for Cold Chisel ~ SCHISELL E STICK, HEN using a chisel or punch, there is always risk of injury he to the hands from a glancing blow of the hammer. A 16-inch length of garden or air hose, in which a slot has been cut 2 inches from one end, makes a convenient holder. Wood plugs fitted into the ends of the hose serve as handles and make the holder more rigid. Rock drills are used same way.—R. A. Meeks. Set Teeth of Circular Saws With Gauge Made from File In IS advisable to use a gauge of some kind when resetting the teeth of large hand saws or circular saws, to make sure that all teeth cut a channel of the same width. An old flat file is readily adapted to this purpose by bending the tip of the handle. When the file is placed against the saw with the bent tip toward the saw teeth, this tip should just barely touch the tips of the teeth when the saw is correctly used. There should now be no bind- ing of the saw in its cut.—Thos. G. Chudy. Ail i4 Modern Mechanix and

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Wear uias Oud COTO ATTA Chaar by HI SIBLEY ROM old Chihuahua province, on the southern banks of the Rio Grande, comes this artistic as well as comfortable chair for your lawn, porch, or sun room. . Not a single nail or screw is used in the entire chair—these were unheard of in the days when some Mexican, or possibly an In- dian, first worked out the simple design. Rawhide lacings hold the frame together, and form the springy covering for the seat. Select and gather your frame pieces first. For the vertical posts almost any American woods such as birch, oak, or ash saplings may ` be used once they are well seasoned. Hoops may be bent from ash or hickory slats by steaming or soaking in water. In weaving the rawhide for the chair seat, use the same care as you -would in restring- co IN LATTICE SPLINTS Nai 19” LONG AS S NOTCHES CUT ON DIAGONAL SOFT LEATHER BINDING FOR ARMS AND BACK oe DIA Y lá x 3 ROUGH-CUT LATTIC HOOPS OF ROUGHLY VST SHARED ASH OR Fasten ftame of chair together with leather thongs which have been soaking for several hours. Leather will shrink in drying, and hold pieces rigidly together. Use dry thongs for chair seat. Inventions, April, 1935 Front and back views of a completed Chihuahua chair as built by the Mexicans. SOFT LEATHER PEt NE RAWHIDE 2 LACINGS Ten, Cover seat of chair with soft leather, fastening to sides of seat hoop with leather thongs. Fasten each reed with fishline and glue in manner shown above, then cover with soft leather binding. Weaving is carried around to each side. ing a tennis racquet, to maintain a circular shape yet have every string tight. Rough slats or splints are notched and fas- tened at an angle around the bottom of the chair to give rigidity and an artistic effect at the same time. The split bamboo or reed used for the herring-bone weave at the back of the chair is. now cut to the correct lengths for horizontal and vertical pieces. These thin reeds are held in place at each end with fish- line and glue, and the ends later covered with a soft leather binding. A coat of clear lacquer will preserve your chair against ravages of time and weather, yet leave the wood and reed in its natural color. Do not lacquer the leather. An occa- sional oiling or rubbing with lard will be suffi- cient to keep the leather soft. Ai

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Gas Bolometer Detects 4 Heat of Distant Candle ., To tell whether certain transparent solutions will pass infra-red rays, place them in flat bottles in front of bolometer, shine flashlight through bottle on to bolometer, and watch for bubbles at water seal. Ferrous sulphate, copper sulphate, or potas- sium dichromate solutions do not allow the infra-red rays to pass. Bend glass tubing to shapes indicated above and connect with rubber hose, to use bolometer to control power circuit AIR BUBBLES WATER through relay. Expand- K ing air pushes mercury V LUNES cen ae up _to contact poine BOTTOM OF Se closing circuit. pen sctew clamp to admit air TEST TUBE to bottle occasionally. BEVERAGE Use iron wite for con- BOTTLE tacts. Potassium chloride BLACK ` - solution will give a faster PAPER action than mercury here. Construction of water seal from test tube and length of glass tubing is shown at right. Photographic black ! paper is best in bottle, though . black cloth or any duil finish paper will work. CANDLE HIS little gas bolometer, operated by in- fra-red rays given off by any light source, will actually detect the heat from a candle or flashlight held ten feet away. By adding an electrical contact, the bolometer can be made to close a power circuit, operating a light bulb or alarm bell when light or heat is turned on in its vicinity. Requiring no batteries, it will be found very economical for use as a fire or burglar alarm. A sheet of ordinary black paper inside the bottle absorbs infra-red rays, converting them into heat which expands the air in the bottle. This air escapes as a bubble through the water seal. The sensitivity of the instru- ment increases as the amount of water in the seal is diminished; it is not at all difficult to detect the presence of a lighted match five feet away by watching for bubbles. The bolometer easily shows which trans- parent liquids and glass panes will pass infra- red rays. A flat bottle filled with ferrous sul- phate solution will pass visible light rays, but cut out the infra-red. Several drops of sul- phuric acid added to this solution will keep it clear. By placing a bunsen burner about a foot from the bolometer, you can easily demon- strate that a yellow flame produces more radiant heat than a blue flame. Bubbles will slow up or stop altogether when the burner air ports are opened to give a blue flame. When making the electrical switch, use iron wire for the mercury contact. This will not tarnish in the rubber tube. Modern Mechanix and

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. SIMPLE MOTORING KINKS Heat Makes Inner Tube Patches Stick HEN the thermometer is hovering around zero, prepare inner tube patches in the usual manner, but touch a match to the cement as soon as it is applied. Blow out the flame immediately, and apply the match again, as often as the cement will burn. Then apply the patch quickly, and it will stick.— H. J. Olson. CANVAS OR INFLAME Use Roller Shade As Radiator Shutter CUT-OFF length of window shade on its roller makes an easily adjustable shutter for the auto radiator in winter. The shade cloth should be re- inforced with a piece of canvas or heavy cloth. The spring tension keeps the cloth from flapping in the 3 BOTH HANGERS| ^ WINDOW. SHADE EAM wind.—Vernon W. Palen. ROLLER CUT DOWN Race Engine to Clear Dirt from Carburetor HEN dirt becomes lodged on the needle valve above the float of your auto carburetor, close the gas tank valve, then speed up the motor till gas in the carburetor is consumed. The vacuum created will usually suck up dirt particles.—J. M. Evans. SPEED MOTOR- FF- x Gore Ae Ford Vacuum Tank VACUUM TANK ITH gravity feed for gasoline as used on model T Fords, it is sometimes necessary to back the car up a steep hill when the gas supply is low. By installing a copper tube be- tween the upper part of the intake manifold and the carburetor bowl the vacuum set up by the engine pistons on the intake stroke will draw gasoline from the tank to the carburetor.—H. M. Anderson. Temporary Repair for Damaged Generator HEN the generator armature on your car en- gine burns out, or a short circuit occurs, a tem- porary repair can be obtained in a few minutes simply by strapping a model T Ford generator to your old unit, and driving it with the same fan belt as was used before. For a permanent mounting use a strap of iron.—R. Spencer. Inventions, April, 1935

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1 WITH THE WIN $5.00 CASH FOR UNUSUAL HOBBY STORIES HETHER your hobby is the collecting of rolling pins, match boxes, wishbones from the Christmas day platters of famous men, or something even more unusual, tell us about it. If possible take snapshots of the collection, similar to those shown on this page. You will then have an excellent chance to win one of the $5.00 cash prizes offered each month for the most un- usual hobby. The story describing your collection should not con- tain more than.200 words. Even odd collections of stamps or coins may be entered. Send your entry to Hobby Editor, Mopern MEcHANIX & INVENTIONS, 529 S. 7th St, Minneapolis, Minn. Be sure to include return postage if you want your snapshots and story returned. "Sailor's Bottles"— given to embarking sailors by sweethearts, to be tossed overboard with a last message of love, if ship met disaster, are gathered by Lerna Kelly of Long Beach, Cali- fornia. S. Wixon of the Battleship Utah holds two of the ornate colored glass: bottles. The collecting of salt shak- ers may not seem to offer any possibilities as a hobby, but Louis C. Gulley, re- tired postal clerk of Venice, California, has 1,520 dif- ferent specimens of them in his collection. He is holding bamboo cane once owned by Aguinaldo, Philippine insurrectionist. Have you a more unique . hobby than this? From every corner of the United States came this armful of pocket matches. Collectors the world over gather these colorful advertising packets, then trade with each other to build up collections. Your own match packet collection, photographed, may bring $5 in MM's hobby contest. 114

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The THRILL OF THE ing Drive Swift streams, swollen by melted snows — tangles of smashing logs — yet those brawny, sure-footed riders of the north- woods enjoy every thrilling minute of the spring drive. But “riding the logs” isn’t in it with the thrills of spring driv- ing on a Harley-Davidson. A new 1935 Harley-Davidson will take you sweep- ing along — darting ahead of slower moving tangled traffic — out in the; clear where the going is good. Don sit back and merely wish you had’ a new 1935 Harley-Davidson. [ ONE! See your nearest d about the FREE RIDE hes offer- ing. Ask him about his EÁsy Pay Plans—and send in the coupon. MAIL THIS COUPON HARLEY-DAVIDSON MOTOR CO. Dept. MM, Milwaukee, Wis. Interested in Motorcycling. Send illustrated literature. Postage Stamp is enclosed to cover mailing cost. Name.... Address. My age is L1 16-19 years, L1 2030 years, C] 51 years and up, C} under 16 years, Check age group. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 115

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ADLETS FOR HOBBYISTS STAMPS MEMEL! We include a stamp, guaranteed genuine, from this distant and rare country, along with a complete Russian Commemorative set; complete Hungarian "Postage Due" set; 3 classic stamps of the world, all over 50 years old; and a complete set of the most historic issue in existence, “The Bosnian Assassination, The Spark That Set The World Afire,” all guaranteed genuine, for only 10c! Pearson Bros., 68 Nassau St., Dep’t. 501, New York. SUPER-WONDER Packet offered, containing 60 different stamps from Brunei, North Borneo, Zanzibar, Sudan, Macao, Iraq, Jaipur, French and British Colonies, including natives, beasts, ships, etc., all for 5c to approval applicants. Big illustrated lists included. Kent Stamp Co., Box 87 (Sec- tion 5), Brooklyn, N. Y 50 DIFFERENT Stamps cataloging over $1.00 only a dime to approval applicants. 20,000 different stamps at prices ranging from Ic. All stamps guaranteed genuine. A fine selection of U. S. revenues at le and up. Address F. G. Stein, Dept. 214, 7360 N. Seeley Ave., Chicago. SUPER-WONDER PACKET of 60 different stamps, con- taining scarce Bolivia triangle, stratosphere balloon, French, British, Portuguese Colonies, Andorra, Inini, Monaco, Victoria, ship, beasts, etc. Only 6c to approval applicants. Potomac Stamp Co., Dept. 903, Washington, D. C. YOU'VE tried the rest now get the best! We have answered all advertisements, compared premiums, approvals, etc., and absolutely proven that ours are far superior. Send 10c for "Challenge Offer" with approvals. Bargain Stamp Service, 1332 South Hope, Los Angeles, California. MAMMOTH Mystery Packet of rare stamps for only 10c to serious approval applicants, also valuable free premiums with every selection afterwards. Our stamps are better and our service different, Fair-Play Stamp Service, 1215 Browning Blvd., Los Angeles, California. BRITISH TURKISLANDS—Also Congo's— Montecarlo— Nigercoast-— Uganda— D fibouti— Ecuadorian— Ivorycoast— Ubangi—Countries collectors need. Free for 5c postage. EM- PIRESTAMPSHOP, Dept. M.M., TORONTO, CANADA, ZANZIBAR—Also Sudan— Somaliland — Tigerstamps— Togoland—Caribbean Archer — Algerian — Centralamericans —Britisheolonials—This magnicarocious collection free for 5c postage, Graystampshop, Dept. MM, Toronto, Canada. MALDIVE ISLANDS, Drunei, Charkhari, Turks Caicos Islands, $5.U.S., genuine Baden, and Imperforate “Park” —absolutely free to approval applicants enclosing 3c postage. Viking Stamp Company, One Hanson Place, Brooklyn, N. Y. AIRMAILS—írom Brazil, Chile, Colombia, Ecuador, Mexico—all for only 10c with double premium penny ap- provals. Progress Stamp Service, Franklin Park, Illinois. 200 ALL Different U. S. and Foreign Stamps including China, Charkari, 50c. Returns exchangeable for others. LeRoy Stamp Co., 416B Ohio, Sedalia, Missouri. STAMPS! 100 diff. 3c; 500 diff. 35c; 1,000 diff. 90c! Illustrated Album (4000 spaces) 22c. Approvals sent. Tatham Stamp Co. (D9) Springfield, Mass. 105 DIFFERENT, Guinea, Congo, Hyderabad, ete., 3c to approval applicants. Extra—Airmail Set free with above. Hunziker, Box 225-F, Minneapolis, Minn. TRIANGLE and 50 different Liberia, Hyderabad, Inini, Azerbaijan, Kouang-tcheou, Gold Coast, etc. Only 6c. Gardner, 5220 Cuthbert, Baltimore, Md. FREE! Gorgeous packet including Spanish airset, triangle, ship, animals, etc., to approval applicants inclosing $c postage. Royale Stampco, South Pasadena, Calif. 116 1000 U. S.— Good Mixture—contains airmails, specials, precancels, commems, dues, etc., price 50c. J. S. Edwards, 719 N. Lime, Lancaster, Pa. GIGANTIC Collection containing stamps from fifty different countries only 10c with approvals. Walker, 471 Witmer, Los Angeles, California. FREE!!! Russia Ethnographic Set or Ten Foreign Picto- rials. Postage 3c. Roberts, 901T Fourth, Baycity, Michigan. STAMPS Sent on approval. 50% discount. Fred Herz- berg, 197 Grantley Ave., Elmhurst, Illinois. FREE 250 mixed stamps to approval buyers only. Send 6c postage. Yakima Stampco, Yakima 3, Washington. CANCELLED Stamps Bought. Send 10c for list those wanted, D. Roberts, 5437 N. Sawyer, Chicago. 110 DIFFERENT Stamps Free to approval buyers, 3c. M. Badger Stampco, Milwaukee, Wis. Postage SENSATION: Airmails from 10 countries; U. S., South America; Pictorials 10c. A. Steele, Springdale, Pa. U. S. $2.50 Consular Service Fee Stamp, 5c, approvals. Chipless, 7080 Cahalan, Detroit, Mich. FREE Packet, 3c postage. Approvals sent. Murkison, 530 Chestnut, Long Beach, California. COINS FREE—Foreign coin, banknote, and large illustrated coin catalogue—4c postage, Souvenir California gold quarter size 26c; $V; size 53c; both 65c! Round or octagon, set of each $1.30! Approvals with each order. Tatham Coinco, Springfield—9, Mass. $5.00 TO $500.00 EACH paid for Old Coins. Keep all old money. Get posted, Send 10 cents for Illustrated Coin Value Book, 4x6. Guaranteed Buying and Selling Prices, Coin Exchange, Box 17, Le Roy, N. Y. WHAT are the odds against receiving rare coins as change? Get facts. Startling information in booklet. Send dime, Stamp. M. Egert, 1502 Dupont North, Minneapolis. STAMPS. Coins. Indian Relics. Curios. Illustrated catalogue and arrowhead 6c. Curio Store, Northbranch, Kansas. CALIFORNIA gold, quarter size 27c; $12 size 53c; 100 different stamps and catalogue coins & stamps 10c. Norman Shultz, Salt Lake, Utah. UNITED STATES. Large cent, 2c bronze, 3c nickel and bargain list, 25c. "Thirteen dates large cents, $1.00. George R. Coffin, Augusta, Maine. We PURCHASE ALL Indianhead Pennies. Price range 5c 5.00. Purchasing catalogue 10c. Brownley Pennies, zià yu New York. OLD MONEY Wanted. $5.00 to $2,500.00 each paid for old coins. Boying catalog 10c. Robert Cohen, Box 483, Muskogee, Okla. WE PURCHASE All Indianhead Pennies. Price range 5c— $55.00. Purchasing catalogue 10c. Photonumismatic, 100 Forsyth, New York. WE BUY 1907 Indian head cents. Full information one dime (coin). New Miss Mattick Co., Box 3455, Altoona, Pennsylvania. HIGHEST Prices paid for Indian Head Pennies. Send dme for list of those wanted. Coin Shoppe, Box 407-MM, ttawa, H FREE list of Old Coins wanted, highest prices paid, include 3c stamp. Eastern, Box 115, Biddeford, Maine. Beadwork. Minerals. Lemley Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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BOYS! THROW YOUR VOICE Into atrunk, under the bedor lf /§ anywhere. Lots of fun fooling i A teacher, policeman or friends. x THE VENTRILO & little instrument, fits in the mouth out of sight, used with above for Bird Calls etc. Never falls. triloquism and the Ventrilo. JOHNSON SMITH & CO. AUTO SCARE BOMB Thé Auto Bomb is attached to the motor of your car, fastening ono wire to the spark plug termtnal and the other wire to anv part of the motor to serve as ù ground. The instant your “victim” steps on the starter, there Is a shrill whistle, followed by & loud bang. The driver thinks his car has exploded. Can be attached In a few scconds. Does not harm the car. Glves you more protection than an insurance polley—catehes the thief in the act. PRICE i5c Each, 3 for 40c. Shipped by Ezpress, not prepaid. Anyone can use it. 64-page Book on Ven All for 10c Postpaid. Dept. 619, RACINE, WIS. O AUTO SKUNK BOM Works same as above. Attached to motor of car. When driver Tesses foot on starter the contact sets off the Skunk Bomb. A dense cloud of smoke envelops front of car; upon raising hood a violent odor greets the PRICE 20c Each, 3 for 50c. Crystal Radio driver. Complete with Crystal 35c ‘This Detec- tor is prncti- cnly a radio in itself, as Jt ja possible to get reception w th it alone, Pom provided you are within 25 miles of & j broadcasting station (or up to 100 miles under, very favorable conditions). All, you need da an aerial and on enr phone and you are all set. It is completely assembled and wired, all rendy for uac. It haa two posts, making connection muah e&s'er, also making iL possible to make changes quickly, Every- thing comnlete, including the stand, erystal cup, orm with catewhisker and neceasary acrews, an ultra sensitive crystal of the finest erade, two terminals for wire_conneclions mounted on handsome base—EVERYTHING COMPLETE FOR ONLY 35 CENTS POSTPAID. Every set tested and recoption positively guaranteed. Put PHOTOS on Slik, Cloth, Wood, Paper, G Linen, otc. THIS EASY QUICK WAY It ia now easy to print your snapshots and other photos on any cloth or other fabrie sur- face—cushiona, pillows, hand- kerchiefa, searfa, tice, hosiery. underwear, paper, wood, linen, ete. The photos are washable. Will not fade or rub off—long lasting. Enay todo, Just fol- low & few simple directions. One bottle is good for about 50 prints in RICH TONES. "Théroughly practical, Price for Complete Outfit, only 25 cents postpaid. A wonderful little instrument pro- ducing optical Mllusions both surprising and - Startling. With It you can eee whot ig apparently the bones of your fingers, the lead in a lend pencii, the in- terior opening in & pipe stem, and many other similar illusions. Price 100, 3 for 25c, pnd. | ATEST :1 CATALOG Dept. 619, A copy of our NEW CATALOG malled on receipt Luxe Edition with cloth binding 23c. d b: Shipped Express only. An excellent little book containing nearly 300 tr for parlor or etage that any- " Tricks h eas, ^ if! Also Second Sigh graphy, etc. Profueely il- fuatrated. 10¢ postpaid. 125 CARD TRICKS and sleight of hand. Contains nll the latest and best card tricka a8 performed by celebrated magicians, with e: posure of card tricks used by professional gamblers, Price 250 postpaid, SNAPPY JOKES. A splendid collection of rich and rare jokes, compiled by a jolly bartender for stag parties, amokers, etc. 10c. FORTUNE TELLING BY CARDS, dle, dominoes, crystal, ete. Glyea meaning of every card, how to deal and lay them out, etc. Price 100 postpald. LEARN TO HYPNOTIZE. Book tella how to hypnotize, how to produce sleep. how to awaken s subjeot, medical hypnotism, hypno- tism in diseases, how to hypnotize animala, etc. Price"TOc!posipald. STAR TOY MAKER phone, raph Instrument, Box ite. Talking Machine, Microscope. | Electric Motor. Electric Door Bell Water Wheel, Paddle Raft, a palr of Sk a Dog Sled, Bird House, Rabbit Yard, ei 64 pages. strations. PRICE 100. MIDGET BIBLE, Size of a postage stamp. Over 200 puges. Remarkable curiosity. Said to bring good luck. Price 15c postpald. BREAM BOOK AND FORTUNE TELLER. "Tell your own fortune. With dictionary of dreams interpretations, lucky numbers, oracles, divinations, palmistry, ete. 1c. HOW TO TIE KNOTS. 32 page book telle how to make different knota, hitches, splices, 100 illustrations. Price 10c postpald. pc AD a ERR DD ie sch Lakh 5-MINUTE HARMONICA COURSE. A new ensy self-teaching method. Teaches how to play, to use the tongue. tremolo, fully illustrated. Price 15e postpaid. BOY ELECTRICIAN Book tells all about eleotricity in almple language. How to make batteries, dynamos, mo- tora, telephones, bella, coi enginea, lighte, telegraph a Li paratus, alarms, radios, ate. 64 paces. Fully illustrated. PRICE 10c postpaid. RACINE, WIS. of 100, r thi book of its kind in existence, the newest stamps, unusu: Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers Here it ls, boys. You can have an immense amount of fun with this new pistol. It shoots 12 to 15 ordi- nary peas without reloading. All you need do is to load the gun with peas, pull the trigger and keep on fring until the barrel is empty. ‘hen reload and fire again. It Is absolutely harmless and safe. Nothing to explode. These pistols sell like hot cakes, so get yours AT ONCE, Be the first boy In your town to own one of these automatic repeating pistols and be the envy of all the other kids neighborhood. PRICE ONLY 2 CENTS Holster for Peamatic 25¢. The Art of DANCING LEARN TO DANCE THE LATEST STEPS. Be popular this season. Really good dancers are always admired—always popular guests. Part- ners welcome them eagerly. With the aid of this book you can learn the newest, smartest steps without a teacher and become a dancer who is sought after. After following the instruc- tions in this new book you won't need to make ex- euses when the dance music starts. Besides you'll get lots more fun out of parties and dances. If you want to be- come a perfect dancer, Jearn to dance at home this new, easy way. WHAT THE BOOK. TELLS: How to de- velop poise and control, how to improve your dance steps, the art of holding, how to walk to music, how to lead, how to do the latest Fox Trot Steps, Natural and à Reverse Turns, the Re- verse Wave and Change of Direction Steps, the Qui step, swaying to music, how to Waltz, Backward Changes, how to do the Continental, the famous Kiss dance, tlic Manhattan Dance, the College Rhumba, the Carlo, etc., etc. Numerous illustrations are given, in fact everything is made so plain and simple that if you follow the instruc- tions given, you'll be dancing before you know it. PRICE 25 CENTS POSTPAID. BLANK CARTRIDGE PISTOL REVOLVER 25c STYLE Thece new models now 50c and SU made and effective. Madelled_on pat- tern of latest type of Revolver. Appearance slone enough to scare & burclar. Takes 22 Cal. Blank Cartridges obtainable everywhere. Great protection ngninsl burglnra, tramps dogs. Have lt lylng around without the danger attached to other revolvers. Fine for 4th of July, New Year's. for stage work, starting pistol, e SMALL SIZE 4 In. long 250. M 5 in. long 50c. LARGE SIZE 6 In. BLANK CARTRIDGES 50c per 100. HOL- STER (Cowboy type) 50c. Shipped by Ex- press only not prepald. Big novelty catalog 10c. JOHNSON SMITH & CO., Dept. 619, Racine, Wis. 117

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'9Tibs.of SKIN and BONES!" -but now TheWorld’s Most Perfectly Developed Man... A recent pho- of World's Most b Perfectly De- veloped Man’' “won in open compeli- tion in the oniy national and international contests held during the past 15 years, HEY thought ^ it couldn't be done—but look at me now! I used to be a skinny, * scrawny weakling weighing only 97 pounds. Only half alive; too sickly for sports; afraid to put up my fists. THEN l discovered Dynamic Tension !--the amaz- ing method that gave me the body which twice won the title, “The World’s Most Perfectly Developed Man." And thousands of other fellows a who have put my secret to work are today the envied, he-men LEADERS in any crowd! Proof in 7 Days that You, too, can Have a Body Like Mine Now I actually guarantee to show you PROOF in just 7 DAYS that I can give you a body that men will respect and women admire. Let me make you à NEW MAN-—with a body of.might and muscle, afraid of nothing, ready for the good things and good times of lite. I'll put solid layers of rippling muscle on y-ur back and shoulders. I cau build out your chest to husky, he-man size and give your arms and legs handsome muscles of powerful strength. I'll give you vigorous new health, too-—banish pimples, blemishes, bad breath. poor digestion, etc. Send for FREE BOOK Mail the coupon now for my valuable illustrated book, “Everlasting Health and Strength,” filled with actual photos, vital body facts and full details of my "Proof in 7 Days" Dynamic Tension Guarantee. There's no risk, no obli- gation, It's FREE. Clip and send coupon TODAY to me personally: Charles Atlas, 115 East 23rd St., Dept. 64, New York, N. Y. . u UND Remp ee ee Á UEM MEME r Und CHARLES ATLAS, Dept. 64, 115 East 23rd Strect, New York, N. Y. I wanl the proof that your system of Dynamic Tension will make a New Man of me—give me healthy, husky body and big muscle development. book, *'Everlasting Health and Strength.” NOME: PE (Please print or write plainly) FV | en EE in A cient vv eas eee esas State ......c.-seee © 1935 C. A. Ltd. 118 Unfolding Mysteries of Boat Plans [Continued from page 109] In laying down the lines a smooth floor is selected, and either painted white or covered with building paper to form a surface to draw on. The first line drawn is the base line, which is made an absolutely straight line by stretching a string about two inches above the floor and projecting down to the floor with a square. The marks are made at the heel of the square at about three foot intervals, and connected with a straight-edge. The station lines are now measured off ac- cording to the architect's plan, and laid out at right angles to the base line. Sometimes floor space is limited and one plan must be laid down over another. In other words the plan and profile are superimposed, using the base line as the centerline of the plan. This has its advantage, in that it makes projection from one to another easier. Usually the two plans are laid down atop one another using different colored pencils to distinguish them. Draw Curves With Batten To draw the curves properly we will need a batten or stick a little longer than the boat and about three-quarters of an inch square. If there are any very sharp curves in the boat a couple of battens about three eighths or a half inch square will come in handy. When the architect’s offsets for a cer- tain line are marked on the floor a batten is run through the points by driving a nail into the floor on each side of the strip as shown in Fig. 7. Never nail through a batten; an unfair line may result as the nail will not allow a natural curve. If any spot in the line appears unfair draw a nail and allow the wood to take a natural curve. The architect’s lines are laid down to a very small scale; each mistake is mul- tiplied 12 to 16 times on your full-size layout. All lines must produce fair or graceful curves in profile, plan and body plan. If they fail to do so the lines are altered by a trial and error method until they do. Subtract Thickness of Planking After our lines are laid down and checked, the job of making the various timbers is the next step in the construction of our boat. As we said before, most lines of wooden boats are drawn to the outside of the planking and the first step in making moulds and timbers is to “take off the plank.” There are various methods used in doing this. In straight sec- tioned boats the simplest method is to nail a square stick the exact thickness of the plank on the inside of our line on the floor and build the frames directly against this. Where curves occur in the section lines the process is a little more complicated. One Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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Unfolding Mysteries of Boat Plans method is to draw a line parallel to the line from which we wish to make the timber and pick this up, as will be described later. An- other method is to tack a series of small blocks of the same planking thickness inside the Jine and build against these blocks. The in- side of the planking is generally termed the “moulded line." The stern end of the boat, known as the transom, is seldom perfectly perpendicular, and does not show in its true shape on the lines plan. A projection must be made from the lines to get its true shape, as shown in Fig. 9. This is called projecting the transom. Cut Keel and Stem From Full Size Plans It is perfectly possible to cut all the rabbet lines of the keel and stem from the lines as laid down on the floor. Fig. 10 shows how this is done. Next to taking off the shapes of timbers on the floor comes the difficult part of shap- ing the planking to fit the job. Where the edges of the planks are curved it will be necessary to fit each plank individually. 'The method of picking up these shapes is termed spiling. 'There are three methods by which this operation can be accomplished, all of them employing a thin board termed a spiling board or batten, which is allowed to lay on the frames with absolutely no edge spring. In other words it must lay in its natural ten- dency on the framing. Transferring Curves With Dividers The first method, and that most generally used, is to set the board as close as possible to the edge of the line to be fitted to. With a pair of dividers set to a little more than ihe greatest gap in the space between the spiling board and the line to be fitted to, a series of prick marks is set up all the same distance away from the line. Be sure that all prick marks are taken at right angles to the line to be fitted to. Mark all of your tick marks with a piece of chalk and rub these an the board when you have transferred the ine. Another method of using the spiling board is to tack a series of sticks to the spiling board so that their edges will be on the line to be fitted to. The spiling board is then removed and the shape transferred to the plank. Yet another method is to draw a series of random lines, on the spiling board and mea- sure along these lines to the line to be fitted to. The measurements are then transferred to the plank. In laying down the lines of any boat be sure to hold as close as humanly possible to the architects plan. He has designed the lines to have certain curves with a definite purpose in mind; any big alteration may up- set the performance of the boat. DIESEL POWER A Coming American Industry The internal-combustion engine represents man's supreme triumph of ma- chine power. Diesel engi- neers are in great demand. = Many are acquiring neces- = sary knowledge through spare-time study of this. modern I. C. S. Course on Diesel ELECTRICAL ENGINEERING —A Great Industry with a Great Future The new course in Electrical Engineer- ing covers this fascinating field thor- oughly. If you are just starting or are partly on the way to a real paying osition in this industry, this new course Brings the broader knowledge necessary for advance- ment. The coupon brings complete information. . —A Field with a Future This course has meant advancement to hundreds of ambitious men, mechanics. draftsmen, blacksmiths. foun en. patternmakers, apprentices, and mo- chanical engineers men who wanted to get ahead and to earn more money. You will find, as they have found, that enrolling for an I. C. S. Course is an investment in a Bigger Future. Uso the couponl . are always in demand Tho rapid progress in manufacture and — (ON Bervice of the modern automobile brings — new opportunities to thousands of ambi- tious and forward-looking men. There's G e always a demand for trained men, The A new I. C.S. Automobile Course will make you a trained manl The timó to act is now. Use the coupon. INTERNATIONAL CORRESPONDENCE SCHOOLS BOX 2319-C, SCRANTON, PENNA. Without obligation, send me full information on. subject checked below: C] DIESEL POWER [] AUTOMOBILE COURSE L1 ELECTRICAL ENGINEERING O MECHANICAL ENGINEERING Architecture Drafting C Accounting Concrete Construction Good English Reading Shop Blueprints 3alesmanshlg Civil Engineering Advertising Diesel Engines Show Card Lettering Civil Service Gas Engine Operating Refrigeration Chemistry Highway Engineering Poultry Farming High School Subjects Air Condittoning Inventing and Patenting Aviation Engines Name Address. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 119

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GET YOUR COPY OF OUR FREE COURSE FLEXIBLE MOLD MAKING WE TEACH YOU TO MAKE RUBBER MOLDS GELATIN MOLDS We teach you how fo use them to mold Plaques, Book Ends, Ash Trays, Flower Holders, Match Haider: and other NovelLles. We teach you how to paint each article. THERE IS BIG MONEY IN THIS BUSI- time we ure offering you LLR (Liquid Live Rub- ber). ‘you brush it over your model. Then heat lt slightly and you have a rubber mold, not a hard composition, but real live rubber—whiech is very flexible and so durable you can mold plaster —llquid marble cement clay or almost anything. Even boiling waler won't harm it, LLR is also sultable for making rubber dolls, toys, insulating the handles of pllers, screw drivers, etc., making rubber grips for hammers, golf clubs, etc., making rubber bands and hundreds of other uses, It's something that's new, but it is really good. USE THE COUPON BELOW AND TRY IT. Hardware—Drug 2355 write for prices on DELL EL CG Ei E STEWART'S STUDIO, 2102 W. 15th St. Chloago, i Minois. Check Here Fleane send me detalla on your FREE Course InfFlexible ing. L1 Encloged find 25c. Send sample Gelatin Mold with Ine structions. 0O Enclosed find $1 Send 8 oz. can of LLR (Postpald) (Enough ser maulng Geveralomali molde witk Inetructlone, NAME (Print) STREET SHOP PLANS Build Your Own Boat! You can easily construct any boat, from an outboard to a big cruiser, by following the simple instructions, plans, and com- plete details given in— HOW to BUILD 20 Boats It your newsdealer is sold out, send 50 conte to FAWCETT PUBLICATIONS, INC., 529 South 7th Btreet, Minneapolis, Minn. 50c at All Newsstands The 1935 How to Build is at your newsstand, 50 cents. 120 Mold Plaster Novelties With Gelatin [Continued from page 98] the inside surface with ordinary raw linseed oil. Use about 94 cup of cold water to each cup of molding plaster when mixing, to make a thick, creamy mixture which will level itself when poured, Fill the mold level full, allow to set a few minutes, then smooth off the top surface with a trowel or large knife. Allow about one-half hour for the plaster to set, then remove the mold. The mold can be used over and over again, regreasing each time. Allow the plaques to dry for several days, then fill up the pores in the plaster with a coat of ordinary shellac, white lacquer, or white enamel. Oil paints can now be used in finishing the product in color. Information on where you can get the ma- terials needed in flexible molding will be sent you, if you are unable to purchase these in your vicinity. Address Problems Editor, Mopern Mecuanrix & Inventions, 529 S. 7th St., Minneapolis, Minn. How I Judge Championship Fights [Continued from page 49] 5. Total points. Now I shall explain the purport of each classification. Aggressive- ness, in the first column, does not necessarily mean walking blindly into the other man or charging helter-skelter into an opponent. In this respect, we must consider aggressiveness of mind as well as body. Too often, a boxer is feinted into a lead with disastrous results. Solar Plexus Punch Is Effective In most cases, however, aggressiveness is best measured by a boxer’s eagerness and ability to give the fans a good return for their investment. If he is continually pressing the fight with good results, there is little question but that he must be given due credit. Clean, effective punches can only be de- livered with the closed fist, knuckles foremost. This is the phase of scoring a boxing match which is most deceptive to the fan whose view of the fight may be impaired either by dis- tance or the presence of some obstacle. To the referee in the ring there is seldom any doubt about the legality or effectiveness of a punch. But to the man in the 25th row, a punch that may be deflected off an op- ponent’s shoulder or head ofttimes appears to be one of an effective nature. Rabbit punches are not clean blows, be- cause they are delivered to the back of the neck with the lower edge of the hand. Punches most effective are those delivered under the heart, under the liver and to the solar plexus. A blow delivered under the heart is damaging, particularly if repeated Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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How I Judge Championship Fights several times. It wears an opponent down. Punches delivered under the liver bring ex- cruciating pain. 'The solar plexus punch to the pit of the stomach is always effective, cut- ting the wind supply and sapping an oppo- nent's strength. In the second column we find sportsman- ship and deportment. Here we consider a boxer's adherence to such rules as require a man to walk quickly to the farthermost corner after a knockdown, to cease hitting after the bell, to obey the referee, and to use proper language. In the third column, we must consider the cleanliness of a knockdown as well as its effect on the recipient. A knockdown which is the result of a half-slip or a push is never as effective as one which is the direct result of a clean punch. In the system of scoring by rounds, a man may automatically lose the round in which he has been knocked down; using tbe point system he may lose only two or three points and retain some recognition ar creditable work before or after the knock- own. In the fourth column, we award points to a contestant when his opponent breaks the rules. There are minor fouls such as flicking —hitting with the open glove—rabbit punch- ing, use of the elbows, use of the head or poking a thumb into an opponent's eye. Low Punches Are Seldom Intentional The low punch is the most flagrant of fouls. But even this, in the light of equipment a boxer is required to wear today, seldom seri- ously injures the man on the receiving end. Automatically, a man who delivers such a blow must lose the round in which it occurs, but the scoring system has such flexibility that he may go on to redeem himself. I am quite sure that most low blows are uninten- tional, anyhow, and that the tendency is to overestimate their importance. What I particularly like about this system of seoring is that it is sufficiently elastic to permit a man to come from behind to rectify mistakes he may have made early in the bout. It also substantiates my theory that things which happen early in a fight are just as im- portant as those which occur in late rounds. I think the tendency is to credit a boxer too much for a strong finish after he has done a poor job of the early rounds. We forget too easily the things that happened early in the fight. In the Illinois scoring system these things are recorded in black and white and cannot be erased. From time to time there have been sugges- tions that the two judges be eliminated. 'This practice, I believe, would do no good. The [Continued on page 143] Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers SAVE MONEY ON YOUR HOME REPAIR Quick, easy, dependable ways to make over 100 of the commonest emergency and routine household re- pairs are explained in this free booklet. ee ee Home m AUTO REPAIRS VERY householder has his SMOOTH-ON p unlucky days, when some- thing suddenly leaks, breaks or comes apart, but—you can laugh at many such emergencies and save much money if you keep a can of Smooth-On No. 1 handy and do your own repair work! Smooth-On No. 1, applied without heat and without special tools, hardens into metallic iron and holds on any metal. It offers the simplest means of stopping water, steam or gas leaks, and is ideal for use on pipes, boilers, tanks, heating systems and automobile radiators, Kitchen utensils, etc. The repairs can usually be finished before a professional fixer could arrive, and at a very small fraction of the cost of an outsider's work. Resetting a loose handle, lock, hinge, stripped screw, bolt or nut with Smooth-On No. 1 seldom takes more than several cents worth of material and a few minutes of time, but the repair holds like new. Hs Properly made Smooth-On |: repairs are permanent, avoid |: labor expense, often avoid buying a much more expen- sive renewal part, and you have the satisfaction of know- |: ing that the work is well done. A dollar saved is a dollar earned, and the money you can keep each year by utilizing Smooth-On No. 1 at every opportunity is a substantial sum. Perfect results require only that simple instruc- tions be followed. Write for FREE BOOK Get the free booklet by returning the coupon, and buy Smooth-On No. 1 in 7-oz., l-lb. or 5-lb. can from any hardware store or if necessary from us direct. SMOOTH-ON MFG. CO., Dept. 69, i 574 Communipaw Ave., Jersey City, N. J. Please send the free Smooth-On Repair Book.

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Today's Most Distinguished Radio Achievement! IL T AL CUSTOM BU IMPERI (8:-TUBE Radio HIS super radio musical instrument was engineered by master craftsmen for those discriminating and exacting radle enthusiasts, who want a finer, more beautiful, more pre- cisely built radio, The Imperial 18-tube All- Wave receiver crystallizes all that is fine and new in today's most advanced conception of radio, Scores of new features, many of them exclusive, result in brilliant sparkling per- formance heretofore unattainable. This exclusive insirument will bring in more stations, ovor greater distances with Higher Fidelity than any other receiver. It is fully guaranteed for years of service—for foreign reception—for your satisfactlen. The FREE Trial Offer enables you to try this super in- strument in your own home, for 30 days, wlth- out obligation. Write or mail coupon. IMPERIAL RADIO CRAFTERS, Division Midwest Radio Corp., Dept. 152A, Cincinnati, 0. Witheut obligation, send me literature describing the Imperial 18-tube Radio—and details of your 30-day FREE Trial Plan. Name .. Street ... High School Course in 2 Years t High School education at home — iz 2 ears or lesa. Course meets all requirements for entrance to col- lege and leading professions. Standard H, S, texta supplied. Diploma ewarded. Full credit for H. S. subjects already com- pleted. Send for Frea Bulletin TODAY. No obligation. American School, Dept. H-428, Drexel at 58th, Chicaga 122 Creating Figures for Wax Museums [Continued from page 83] mixing Plaster of Paris. "Like Washington, here. Fifty per cent of our business comes from orders for non-criminal characters. Setting the head upright on a board, he took clay and worked it into slender, flat pieces. "These are ‘stops, ” he said. “When plaster is placed over the head, these strips will break it up into panels." Sun's Heat Cannot Melt Wax “You can start heating the wax, now, Bill," he said, turning to his young assistant. "By the way—this is not ordinary wax. It's five different kinds of waxes, and it's tempered just like metal." While the wax cools, he ties the three panels of the plaster cast together with heavy twine. Soon, the wax is gurgling into a spouted can. “Pour it slowly, we don’t want any bubbles—” As soon as the mould is brimful, Christo- phel immediately up-ends it back into the container. “We pour it out because we want a hollow head. If solid, it holds the heat too long and afterward expands out of shape. There’s plenty now to give it about an inch of thickness all around.” The next step is to untie the ropes and re- move the mould from around the wax casting. Chris next hauled out tools, then a handful of glass eyes—real ones—and false teeth! “Just a few of the things that make them more real,” said Christophel. “For each head a special set and size of teeth is used, copying, as near as possible, the persons’ own. The eyes must match also. And—” he pulled down a huge box and opened it. Out of it cascades every known shade of hair. “Human hair! I even make eyebrows and eyelashes for my figures—to the exact length and size. The hair is stuck—imbedded—right into the scalp like this." He picked up a needle- pointed punch in one hand, a lock of hair in the other and began vigorously pecking away. Body is Made of Paper, Not Wax *Now about the body. My latest invention is a breathing figure. To start with, moulds are made of the body with plaster casts. But papier-mache instead of wax is used in con- struction," he nods toward Bill who is in- dustriously slapping wet paper into the mould. “Only on exposed parts—heads, feet, hands, is wax used. . *Here is my breathing figure—" he walked over to a nearly complete body lying on a table. Reaching toward the chest, he pulled two door-like parts open. Inside was an off center wooden disk on a steel shaft. “When this disk turns, it lifts the divided pieces, causing the chest to rise and fall. Under- neath is the silent electric motor running a reduction-gear timed to conform with breathing." Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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Clipping Dollars From Auto Costs [Continued from page 65] make an economy record. Mechanics loos- ened all the bearings, lubricated them with vaseline instead of grease, tuned the motor to its finest performance, and took the car to the level floor of a nearby valley. Here they drove for a number of miles, alternately gathering speed and coasting. Low and High Speeds Eat Gas When results were computed, the experi- menters were amused and chagrined. The car had gone slightly more than 100 miles to the gallon! So fantastic were these figures that they did not dare use them in advertising, for no one would believe them. These experiments. prove beyond doubt that a careful person who knows how to drive for economy and has a well-adjusted car, can cut his gasoline bill astonishingly. Speed is the motor’s costliest attribute and at the same time offers the largest chance to save. If you drive 20 miles an hour, you will actually get twice as much mileage from ‘your gasoline as at 60. The average automobile attains its best mileage per gallon of gas at a speed of from 20 to 25 miles an hour, then falls off rapidly in efficiency. The car that gives 17 miles to the gallon at ten miles an hour, will give 19 at twenty miles, 18 at thirty, 16 at forty, 12 at fifty, and only 7 at sixty. Fast getaway is economy’s next worst enemy. Recent experiments showed Bureau of Standards scientists that in some cars the carburetor could be adjusted to save at least 25% on gasoline, simply by sacrificing a little of the flashy performance of the car. Light- ning stops eat fuel almost as fast. Penalties of Faulty Driving Actual measurement enabled engineers to work out a “price-list” of the penalties paid for some of the common faults in driving. Excessive use of brakes, one mile per gallon, Needless racing or “gunning” of the motor, two miles per gallon. Unnecessary idling of the motor, one-half mile to the gallon. Too heavy oil costs 1 to 2 miles per gallon. A ten per cent up-grade costs 8 miles a gallon; a five per cent grade, 4 miles. Driving into a 20 mile wind costs 3 miles to the gallon more than a 20 mile tail wind. The driver at sea level gets 3 miles per gallon more than at 10,000 foot elevation. The care you give your motor is a big factor in economy. Your new car is delivered to you in perfect condition, but like any other high-speed, precision piece of machinery, it needs occasional adjustments. For example, in an average engine which has gone one [Continued on page 146] Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

graving with any of our presses.

European Address, Kelsey, Montreux, Switzerland

eS SABA Print for Others, Big Profits Ox NE Pays for itself in a short time, o NOS 5 Easy rules bont Write for Irea M EE TR catalog of outfits and all details, ERAAI. The Kelsey Co., Ko.Meriden, Conn. 123

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Row Boats—= Tenders, Sail Boats, Canoes INDIVIDUAL CHARM ARTISTIC BEAUTY LUXURIOUS COMFORTS UNCHALLENGED SPEEDS and seaworthiness are easity {ecoantzed in the ermain-Craft Boating is clean, healthtul sport and build- inr your own boat from our bullding plans and instructions, full size paper patterns, or seml-erected frames and ready cut materials is a profitable pleasure. Twenty-five models lo choose from. Germain boats are backed by more than thirty-four years of careful de- signing and the construction of many of the finest pleasure and racing craft produced in this country. GERMAIN BOAT COMPANY 506 S. Niagara Saginaw, W. S. Michigan GO TO HIGH SCHOOL AT HOME Maxsm up the education you missed. Study at home in spare time. Your choice of subs jects. Expert instruction. Personal service, You make quick progress because you are in & class by yourself. Diploma. Mail coupon today for interesting FREE BOOKLET. “INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University" Box 2322-C, Seranton, Pa. Without cost or obligation, please send me full particulars @ about the course I have checked— O High Schoci Course O English H Bookkeeping ng . O Accounting [] Civil Service Salesmanship Advertising Can You Identify Fish You Catch? [Continued from page 76] brook pickerel (Esox vermiculatus); and the banded pickerel (Esox americanus). Both the chain pickerel and the banded pickerel are found only east of the Alleghanies, while the western pickerel goes as far westward as Wisconsin, Iowa, and a portion of southeast- ern Minnesota, but was never numerous in Minnesota. Tn the three true pickerel, there are no rows of yellowish or lightish spots up and down the sides as on the true and only great north- ern pike. On the three pickerel the back- ground coloration is some shade of green with streaks, reticulations, or bars of darker against the green. The chain pickerel obtains its name from the fact that the markings on its sides resembles the chain armor worn by the knights of old. Wall-Eyed Pike is a Perch When a writer of some years ago gave the wall-eyed perch the name of wall-eyed “pike” he surely started something, and the argument will probably boom down through the ages. The wall-eyed -pike is not a pike at all, but is the larger member of a group of perch led by the wall-eye, followed by a close relative, the sauger, and ending with the yellow, or banded, perch so common to our waters. Undoubtedly the first named was called “pike” by reason of its pike-like ap- pearance. If you are in doubt whether you have taken a wall-eyed pike or wall-eyed pike-perch, as it is sometimes called, rub your hand over the body. It will be found rough and harsh to the feel, as there is no slime covering its scales. The true pike or pickerel on the other hand have a body that is slippery with slime, the same being a film to protect the body against parasites. The extremely sharp points or spines in the dorsal (back) fin of the wall- eyed pike is another easy means to telling the fish. Yet if these two methods fail, look at the eyes of the fish. After the fish has been out of the water a short time they turn milky or whitish in color, sometimes as though white-frozen. One look at the eyes of the wall-eyed pike, and noting this white color of the eye-ball, instantly marks it as a wall- eye for no other fish has eyes that change in this manner. Also remember that whereas the pike, pickerel and muskellunge have only one back fin, the wall-eye has two. The sauger (Stizostedion canadense) differs from the wall-eyed pike (Stizostedion vit- reum) in that it is a slimmer fish than its relative, is lighter by far in coloration, and hardly ever goes over a few pounds in weight. Fishermen have a contempt for this fish and class it as “all bones and no fish.” It is found 124 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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Can You Identify Fish You Catch? in the rivers, and in many of the lakes of the north, principally in Canada. There is a dis- position to drop canadense as a variety, and to class the wall-eyed pike and it as one. The difference between the two is not great. While not as great confusion exists in differ- ing between the large-mouth black bass and the small-mouth bass, it is sufficient to need some explaining. In the small-mouth bass (Mycropterus dolomieu) the corner of the mouth is forward of a line drawn perpendicularly from the eye downward. In the large-mouth bass the cor- ner of the mouth is back of this line. In the small-mouth bass the eye has some touch of red to it, either yellowish red, orange red or some other such red shade. This is unfailing, no matter where you find the species. No Stripe on Small-Mouth Bass The background coloration of the large- mouth bass is greenish, varying according to the water it is taken from. The small-mouth bass is sometimes darkish green, but is mostly brown or brownish gray. The green background coloration of the large-mouth bass is sometimes relieved by a black stripe or band that extends from the gill cover to the tail, in some specimens from some waters, very sharply and distinct!y etched in, but in others, merely showing as a broken-up blotching of black along the lateral line on the side. This stripe is never found along the side of the small-mouth bass. Its markings, if any, are darkish perpendicu- lar bars on the sides, absent in specimens from some sections of the country, but prominent in members of the species in other sections. Spots Disappear on Lake Trout The trout in this country with which the angler is most concerned are the lake trout, the brook trout, the rainbow trout and the brown trout. Of these the lake trout (Cris- tivomer namaycush) is most common, be- cause it is taken and sold in the markets by the commercial fishermen. It is not a stream fish, being found chiefly in deep-water north- ern lakes, in several of the Great Lakes, throughout the region of Ontario, Montana and British Columbia. In the latter sections of the west it is also called mackinaw trout. Young specimens of the lake trout are very much spotted in whitish against a grayish background. In older specimens of the lake trout the spots will have almost entirely dis- appeared, and the trout will be plain grayish and half silvery in color. Up to 12 or 15 pounds, lake trout keep their spots. i There are two varieties of the lake trout, namely, the plain gray trout and the so-called salmon-trout, or red-fleshed trout, often called erroneously, “land-locked salmon” in [Continued on page 131] jl S m- Z ES, you can! Send $5 B u | Ke | x it F for full-size patterne and daz : = clear detailedinstructions, with special Private Permit and Label for making (yourself) instant-lock joints under Diehl patented “Sure-Tite” construction methods, enabling you to build this tremendously satisfactory water-tight sec- tional fishing and pleasure boat ($110 finish- ed value, same as our most popular factory product, used in Government Forest Survey and approved for Naval Air Force), Only ordinary tools and skill smal] shop- room, and home-bought materials that need cost, paint and all, less than $20. No parts necessary to have made or buy from us. ——Or we will furnish parts, or boatin any stage of completion, at reasonable cost. or more 12 ft., comfortable three-seater -- easy-rowing -- speedy -- very staunch and rugged for powerful outboard motors. =b me uuum uui Ms Mu E M E m, Nests to 3x31 ft.x20 in. for handy running-board pack. Putstogether single-handed in 6 minutes. Positively stronger, more rigid than single-piece. Can’r leak at joints. Lasts for years. Don't doubt in advance—confidently send $5 check, bill or money order for patterns, the Diehl Patent-Permit and complete building instructions on strict money-back guarantee of practicability. Information free, DIEHL BOAT FACTORY, 3267-9 N. 8Bth Street, Milwaukee, Wisconsin Marine Builders for. 25 Years Get atations all over the world with this POWER- $ 95 FUL radio receiver! All Wave-—1b5 to 600 metere], Works on two inexpensive batteries. T a toy or attachment! Results Guaranteed! arta mounted om Ace kits Include all attractive metalchasslaand panel. Clear pictureinstructions. Wire ityoureelfl It’s easy] One Tube Kite»$1.95. Two Tube Kit—$2.85. ALL ELECTRIC 105-125 volt AG- DO two tube house current set. No batterles needed] Complete k1t $3.65. Kits wired7Sce 5 extra. Tubes 85c ea. Doubleheadphones—$ 1.25. AES = ORDER NOWI Send $1. deposit, or postpaid if full remittance. Send for literature. FREE'!I Large three color map of the WORLD, valuable Short =ë Wave data, etc.!l Send 10c for handlin WI ACE RADIO LABORATORIES oop mxa 1519 broadway RAYS Reg.U.8.Pat OF “Silver Only" BOYS BIG FUN. You apparently see thru Clothes, Wood, Stone, any object. See Bones in Flesh. FREE PKG. radio picture films, takes pictures without camera. ‘You'll Ilke *em." t pkg. with each 25¢ order. MARVEL MFG. CO., Dept. 88. NEW HAVEN, CONN. Better Built Lower Prices Canoes $45 and up seats SEE Only Boats With Full Length Spray Rails Keep passengers perfectly dry—even at high speeds. Catalog also shows snipe sail boat complete with sail for $185. Two big factories. Prompt shipment. Write f COS FREE kindof Vent a when vou are interested. Very fast utility model THOMPSON BROS. BOAT MFG. CO. ^? 230 Ann St. Write to 130 Elm St., either place. CORTLAND, N. Y. Rowboats $36 and up RENI Outboards $42 and up RU. PESHTIGO, Wis. Thank You for Mentioning Modern Mechanix and Inventions far April When Writing to Advertisers 125

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Only HALF ALIVE . . Because of Poor Posture and Dislocated Organs BUT NOW HEALTH AND VIGOR HAVE | RETURNED "I HAD backache most of the time; constipation was giv- i ing me headaches; I hadn't | BREATHE p enough energy to get through MORE c \ the day’s work. I was only half-alive—and looked it! “Exercises at home were no use—too monotonous. I'd for- get them or put off taking them. My doctor said: ‘Look here, Sam, what you ought to do is send out to Salina and get yourself a Natural Body Brace.’ “Man! Did that brace do a job for me. It made me cor- rect my posture—literally did it for me. It got my kidneys and liver back into normal working position. The weak- ness that was making me feel like an old man simply disap- peared.” Over 300,000 satisfied users testify to the amazing benefits of the Natural Body Brace. Medical text books recommend his Brace, and physicians pre- icribe it for patients suffering from weakness, headaches, backaches, poor cireulation, constipatlon, in- digestion, lung and heart troubles resulting from poor posture and dislocated organs. The wonderful Rash Health Ser- Tlce, given free, assures perfect fit of your brace, guarantees rellef from suffering, on a money-back basis. Send today for free beauti- ful illustrated booklet—‘‘Health, Strength and Perfect Figure." There is no obligation whatever. Mail the coupon today! NATURAL BODY BRACE COMPANY Energy All Over. I Feel Like 134 Rash Bidg., Salina, Kansas — 55 Although I'm Over 40. n e a —À — ee S e — NATURAL BODY BRACE CO., 134 Rash Bldg., Salina, Kansas Without obligation on my part, please send ] me your free illustrated booklet “Health, Strength and Perfect Figure.” ^W Bigger Lung Capacity With My Shoulders Held Back I Breathe Deeper—That Means More ra Corpuscles, Better ealth. No More Stomach Pressure Plenty Of Room Yor My Stomach Now—Good Digestion, No Gassiness, Heartburn, Sick Teeling. I DON'T GET TIRED Nerves Untangled With The Pressure Off Nerves And Arteries, I Get Plenty Of Blood In My Feet And Hands. gg Feel Like Young Man Man! I’m Tingling With New "Midget Miller"—HModel Racer [Continued from page 95] rod mounted on springs. The 2" holes in the frame give the axle just enough play for the average city pavements. If you plan to use the car on rougher roads, it is advisable to use wider stock for the frame and drill larger holes to give the axle and springs more play. Next month construction of the “Midget Miller” will be completed. The article and drawings will go into detail on the handling of the springs, motor, shift, cluich, and con- struction of the body. Those who want to get under way immediately on this midget car should order the blueprints described below. BLUEPRINTS FOR THE “MIDGET MILLER” Blueline prints of the “Midget Miller", printed on tough paper to stand rough han- dling in the workshop, are available now at $3.00 postpaid. These prints contain both installments of the detailed instruction and plans, which are greatly enlarged. Send your orders to Modern Mechanix Publishing Co., 529 S. 7th Street, Minneapolis, Minn. Science Builds the Modern Home [Continued from page 70] dehydrated air. It stays dry because nothing can get in to dampen it. This layer of air acts as an insulating balance between the panes. The temperature may go below zero outside, but the inside window panes stay more nearly the temperature of the room because the heat rays, blocked by the air space, do not escape so fast. This development is considered especially important to house-builders who like generous window space. It now appears that they can have it without putting too severe a strain on the heating. Limestone, furnace slag, bottle glass and other materials are being blown into fibers which are matted into bats and used as snug insulating blankets inside the walls of the new house to prevent heat losses and keep out un- desirable temperatures. Whether one builds of lumber, brick, stone, concrete, steel or other things, science has been at work improving these materials for better houses. Lumber for instance, is now being made with micrometer-like exactness, corners rounded and smoothed to ease han- dling and ends accurately squared. More effective ways of treating lumber to curb ter- mites and to make it more fire-resistant have also been developed. Engineers and chemists have developed stronger brick and mortar, interesting forms 126 Thank You for Mentioning Modern Meckaitixz and Inventions for April When Writing to Advertisers

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Science Builds Modern Home of synthetje stone and just lately, pre-cast concrete joists have been placed on the market, They save building time and make the house more resistant to fire. These joists serve a double purpose. On the first floor, for instance they not only act as structural members but form decorative rafters for the recreation room in the basement. Paints with a rubber base for a more effective appli- cation to concrete have been developed. Con- crete that looks like irregular-jointed stone, ashlar it's called, and concrete that resembles over-lapping clapboard for outside the house are other recent innovations. New Plaster Board Eliminates Lath Marks New plaster board, put on in relative small units with the aid of spring clips reduce noise transmission and break up strains or stresses so that the plaster is less likely to crack. It also eliminates lath and joist marks on the ceilings and wall New forms of synthetic Jumber made from wood fibers are on the market for interior trim and to increase noise absorption. There's a whole new “family” of synthetic resin plastics for interior and ex- terior walls. New types of floor construction include cellular steel beams that also serve as electri- cal conduits, and metal clips for wooden floors without nails. There are new sound-absorb- ing plasters, an interesting new line of win- dows with spring and grooved balances in- stead of the usual weights. Copper piping, with sections joined together by soldered sleeves instead of the usual threaded joints and unit bathrooms than can be installed in a variety of room shapes and in various types of construction are other new ideas in plumbing. Copper sheeting, new cement and asbestos shingles are included in the 1935 model roofs. Homes Being Built at Factories The wider use of steel and glass as major building materials and the development of the more completely prefabricated house are interesting developments that will be watched with special care this year. Prefabrication, a method as old as the pyramids, is being worked out more completely in some of the new houses, particularly those of steel, plywood, glass and brick, to reduce assembly costs, save waste and to give standardized factory pre- cision throughout the dwelling, The prospective builder, deluged with a host of new products and new ideas, can obtain competent aid in the selection of his new house. Wise advisers suggest the prac- tical value in the services of a competent architect. One national service bureau has a new free catalogue, containing the most re- cent offerings of hundreds of manufacturers. Accept this Sensational 10 Day Trial Offer F REE “a aeei (tat details ee o Send Gee No Money Ae Genuine Brand- NEW ROYAL PORTABLES For the first time, you may obtain a genuine, new, latest model Royal Portable on 10 days free trial. Lowest Prices and Monthly Terms Unusual new sales peu places amazing convenience of the Royal Portable easily within reach of readers of this magazine. Try a Royal Portable at no ex- pense to you. Even if you have never typed, you can use one instantly. If not pleased in every way, it may be returned without question. : Royal’s Simple System Learn Touch Typing of Touch Typewriting,” prepared by expert instructors, will enable you fo acquire professional typing speed and facilit: spare time at home. “ Astonishingly quick res tes This isYour Opportunity Business and Professional Men and Women, Students, Teachers Parents! Be sure to sign and mai! the coupon. This entails no obli- gation. Remember — Royals are the finest of portables — made and fully guaranteed by the world's largest organization devoted exclusively to the production of typewriters. Smooth, rhythmic action of an office typewriter. Will last a lifetime. Act at oncel Offer not guaranteed after March 30th | Royal Typewriter Company, Inc., Dept. M-4 | 2 Park Avenue, New York City I Please send me complete information concerning f Royal’s special new sales plan on latest model i Royal Portable Typewriters with details of [| [| l [i FREE Typing Course .« » CARRYING CASE included in This Offer 1 l I I t l ! 1 [ I I 4 10-DAY TRIAL OFFER FREE. L CITY... ne eee STATE wee hit;’ i enden popularity; in creased income. Opportu nities for good-pay jobs. You can qualify quickly. on trial, any Bues- cher in- strument. Write now for details andhandsomeFrea Book.Mentioninstramen’ | Baxophone, cornet, trom- bone, ete, 415 BUESCHER BUILDING ELKHART INDIANA Thank You for Mentioning Modern Mechanix and Tasroitins for April When Writing to Advertisers 127

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E Architecture Carpentry |- | Carpentry Sand | and Beilding Building, HELPS for Home Builders or anyone planning to Remodel His Home If you are plenning to remodel ^, your own home take advantage Pore of this FREE OFFER NOW. wo» Under the new modernization program you are permilted to do your X own wor for doing it if you know how. These five VERAS. v. and Pay Yourse big books, Architecture, Carpentry and Building cover every phase of building and repalr, from the preparation of drawings to completion of the work. Use of tools, construction, heating, lighting, plumbing are all fully covered, Nothing has been overlooked. The new Jiffy index lets you put your finger on what you want to know instantly. Get these books NOW and qualify in a few days for almost any kind of rebuilding job. No Money Needed—Don’t Send a Penny You take no chance of any Kind. Just send us your name and address on ihe coupon and we will ship the complete set of Ave big volumes, 2,400 pages, without a penny of down payment. Look them over, tind out anything you want to know and then, at the end of ten days, if you want to keep them, send only $2.00. After that send only $3.00 per month until the special price of only $19.80 has been paid. (Former price, $24.80.) wwmmmasFOR FREE OFFER USE COUPON smana American Technical Soclety. Drexel Ave. at 58th St., Dept. G4320, Chicago, IIl. I would like to look at the five books described above. Send them on your free offer. 1 will examine them thoroughly and return them 1n ten days unless I Hke them, in which ease I will send you $2.00 and after that $3.00 per month until the total prico of only $19.80 is paid. NAME Qzoocecesessecis ase sei disi aS wal es iee e ies MI Ra ERIS sasa Address .......... € sesuessaosereesesaesossequeveasoseesosoe Attach letter stating age, occupation, employer's name and address and that of at least one business man as a reference, desire to contact earnest men to COUR work and learn Electric Arc Welding in their laboratories at the School of Engi- neering. Small training Fee. Accepted applicants will be fully trained until ready to pass rigid test and assisted in securing employment. Arc W eldi rc e ing portunities for steady income and X future success. Welding is growing rapidly, replacing large and intricate castings, rivets, nuts, bolts, screws. It is commonly used in assembling cranes, hoists, bridges, Structural steel work, etc. No limit to the application of welding to industry, increasing durability and reducing manufacturing cost. There is a decided shortage of properly trained welders. Why be content with ordinary work, hit or miss jobs and low pay when in a short time you can become a trained Specialist in Welding? ware MILWA UK E Eam GCHOAL of ENGINEERING? Snstitute of Efectrotechnics presents one of the outstanding op- Without obligation send Free Booklet '"The Dawn of a Gigantic Industry and its Outstanding Opportunities." Name .... "not harm the tubes in the least. 3-Tube Toolbox Portable Radio [Continued from page 92] with a l4-inch shaft extender couples the dial to the tuning condenser. This shaft and coupler may be made from an old bakelite dial Break the dial and remove the bushing. Cut off a piece of 4% inch shaft from an old control or condenser. Solder one end of this shaft into the bushing so that the set screw will be free to engage the condenser shaft. The chassis may then be removed without taking off the tuning dial. Chassis Rests on Sponge Rubber If an electralloy panel 7x18 inches long is used, there will be a three inch strip left over. This may be used to make two brackets which are bolted to the inside of the box about eight inches from the bottom, to support the chassis. A sponge rubber base is placed between the chassis and these supporting brackets. Two small pieces of sponge rubber will dampen tube vibrations if placed in the tops of the | shield cans. Bend down the two flanges that formerly held the tray in the box. Form the chassis from a strip of electralloy 7x15 inches long. This must be cut down to 644 inches in width, and is easily done. Take a rule, mark off 1$ inch and follow this line with a sharp pointed instrument until a deep cut results. Place the panel in a vise and bend back and forth. It will break off cleanly where the line has been cut. Bend this panel to dimen- sion'; given and drill holes. The battery cable fastens to a six prong wafer socket which is fastened on the bottom chassis flange. Rubber grommets or bakelite bushings of 5-16" or 15" size are used where wires pass through metal. Filament Switch is a Tone Control Shaft Use moisture proof hook-up wire and Solder joints well, making resistors and con- densers vibration proof. Wire in filament circuits first. The filament switch is on the shaft of the tone control. The high impedance R. F. choke may be mounted on a stand-off insulator or soldered directly on the tube socket plate terminal. Study the connections to the six prong “19” tube carefully before wiring. A means of cheap insurance against tube burn-outs is used in this set by wiring a flash- light bulb in series in the B lead. Any B battery short circuit will blow this bulb and This fuse may save the cost of several sets of tubes. All B batteries may be disconnected by un- screwing the flashlight bulb. Negative wiring and grounds are soldered to any machine bolts which protrude through [Continued on page 132] Thank You for Mentioninc Modern Merhanie and Inventions for April When Writing to Advertisers

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Grand Coulee's Electrical City ` [Continued from page 59] furnace. No chimneys are needed, giving an additional saving of $50 to the builder. The electricity is being furnished to the contractors by the Washington Water Power Company of Spokane at a special rate which enables a five-room house to be heated for about $60 a year. One reason for portable heaters besides their convenience, is that Mason City will exist only while the Grand Coulee dam is under construction, a period which may be from five to eight years. The builders will be able to salvage portable heaters more easily than any which are built into homes. Electric Heat is Cheaper The light circuits will have 110 volts, the heating, 220 volts. With the average five- room house requiring 1615 kilowatts of heat, it can be wired for heating at a cost of $2.00 per kilowatt. Heaters of proven quality may be purchased for about $5.00 per kilowatt which brings the net cost of the house, even if it must share in cost of distribution, to $181.50. The simplest hot air furnace at Ma- son City would cost $250 to which the cost of chimney would have to be added, or an- other $50. Figures compiled, but which can- not be revealed, show that electricity can be used in comparison with other fuels if the base rate does not exceed five mills per kilo- watt If desired that a humidity unit be added, which is the ultimate goal, the cost of the heaters would be slightly higher, al- though the consumption would be less for the same result. The Mason-Walsh- Atkinson-Kier com- pany. or the MWAK as it is now known throughout the northwest, estimates that dur- ing the construction of the Grand Coulee dam a $100,000 saving will be made by heating with electricity. Six Men Build Six Houses a Day The homes and other buildings in this new city are of timber construction. They have siding of Pondosa pine; the floors are of na- tive fir, with a sub floor and paper insulation. The interior furnishings are also of Pondosa pine. There is a front and a back porch on each. The houses and bunkhouses were cut and eonstru-ted in a lumber mill in Spokane and shipped, knocked down, to the dam site. There six man crews erected them at the rate of six houses a day. Water for this mushroom city will be pumped from the swift-flowing and deep Columbia, chlorinated at the pumps, and settled by successive storage in each of three huge wooden reservoirs built high on the cliffs. [Continued on page 130] AIR CONDITIONING THE NEXT B!G INDUSTRY Its opportunities are as big in winter as in summer, Plumb- ing and heating engineers must know Air Conditioning —the field in its broader as- pects invites ambitious mon. Write for information on the new, up-to-the-minute course on Air Conditioning now of- fered by the International ka Ee s Correspondence Schools. ees INVENTION —a field of opportunity for men with ideas If you have an inventive turn of mind, this new International Correspondence Schools Course in inventing and pat- ` enting will teach you all the basic knowledge you must have in ordor to eam real money from your talents. The coupon will bring full information. CHEMISTRY —a career of e service and profit No field of human endeavor offers greater possibilities today than chemistry. All progress is dependent upon this fascinat- ing science. And right at home, in spare time, you can learn the fundamentals by study of the International Correspondence Schools modern course. Today. ask us for complete information. Send for an inter- esting booklet — free. RADIO holds great rewards for trained men TS Almost in a decade radio has become a giant industry. The opportunities created will be enjoyed by trained men. The International Correspondence Schools Radio Course, pre- pared by leading authorities and constantly revised, will help make you a trained man! A fascinat- ing book—FREE. Mail the coupon. Box 2320-C, Scranton, Penna. Without obligation, send me full information on subject checked below: O Air Conditioning L1 Chemistry O Inventing and Patenting LI Radio O Architecture LI Concrete Construction Li Mechanical Engineering Lj Reading Shop Blueprints Li Civil Engineering L] Electrical Engineering O Diesel Engines Gas Engine Operating Refrigeration ivil Service D High School Subjects Aviation Engines Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 129

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Yours for {0ta Day writer. ompleteiy rebuilt an LLY GUARA g Lowest 'Terme— Moneys Back Guarantee als i strate learned, given during th ffer. until zm, price) ia : moe Limited o doien "act ate mee SSS ee ee ee INTERNATIONAL TYPEWRITER EXCHANGE West Monroe St. xia i, ? Dept: 405 ( Name ESI UN Wn GRE PROFIT every $6 SALE Forceful, dramatic, copyrighted selling or “Proven Profit Plans" manual sells amazing new $3,000.00 Life and Accident Certificate for you. Merely write applica- tion and pocket profit. Rush name, age, address and name of beneficiary for your own free Certificate and full supplies. Hurry. American Aid Soie Dept. 606, Willow Hill, Ill. Write for free booklet describing ‘87 Plans for Operating a Successful Business of Your Own", @ BP Make from $20 to $100 a week starting in spare f Š time at home. No peddling or house-to-house selling. B | Booklet sent free, and without obligation. Write for B your copy today. E ELITE. "PUBLISHING CO. 4 Dept.G 214GrandSt. New York, N. Y, Send for This 96-Page à Book of Fishing Facts FRE E! If fishing is * your hobby » you'll want this book. > All new—11th revised edi- \ tion. Fishing facts ga- lore. Bait and fly cast- ing lessons.Shows fish species in life colors, Articles by noted a ekle Shows new SouthBendTagkle in big variety. Write for “Fish- ing—What Tackle and When.'* BAIT CO., 508 High S SOUTH BEND.IND. 130 Following the Migratory Birds [Continued from page 11] oceanic flyer, travels 2,000 miles over the Pacific between the Hawaiian Islands and Alaska. While not as daring as golden plover and the turnstone, the arctic tern holds the cham- pionship for long distance flying—11,000 miles from his winter home in Patagonia to his summer home around the Taku glacier. This makes an annual flight along the coastline of about 22,000 miles, a low estimate when taking into eonsideration the fact that their breeding grounds are known to extend to within seven and one-half degrees of the north pole. Aviators racing against birds have re- vealed many interesting facts about their Speed. Small birds fly at an average of 20 to 37 miles per hour; crows, 31 to 45; geese, 42 to 55, ducks, 44 to 59; falcons, 40 to 48, and waders, 34 to 51. ` The highest speed is set by a swift found in India which has been timed over a course at between 171.4 and 200 miles per hour. The homing pigeon, notorious for its speed, achieved. 55 miles per hour in an accurately timed test. The study of bird habits, their speed of flight, and their summer and winter haunts, is carried out almost entirely by men who trap and band the birds entirely without pay from thé government. The government supplies these men with numbered aluminum leg bands to be attached to captured birds. When a bird is banded, a record of the number is made, together with the date, locality, and species of bird con- cerned. When a banded bird is retaken, the number is checked to aid in the study of the bird's flight. Grand Coulee's Electrical City [Continued from page 129] Power is brought in from Spokane over a 92 mile long, 110,000 volt transmission line. To carry this line across the deep gorge of the Columbia river required the stringing of a cable span 3,087 feet long, the longest power line span of its kind in the world. A sub-station within the new city reduces the 110,000 volt power to 110 volts for the lighting circuits, and 220 volts for heating. Twelve homes are set aside as a test labora- tory for the College of Mechanical Arts and Engineering of Washington State College. In each of these houses meters and instruments in special rooms on the back porches will re- cord the power requirements of heating and other electrical equipment, and at the same time record indoor and outdoor temperatures, humidity, and barometric pressure. Thank Vou for Mentioning Modern Mechaniz and Inventions for April When Writing to Advertisers

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Can You Identify Fish You Catch? [Continued from page 125] the north. If you take a deep-run lake trout and its flesh is pink or reddish, much on the order of the salmon, be certain that you have taken a red-fleshed lake trout. If the trout has ordinary white flesh, it is the gray trout. Brook Trout Have Tiny Scales Our most famous and much extolled brook trout (Salvelinus fontinalis) is easily told by several coloration characteristics or markings that gre known to it alone. If the trout you take has the familiar wormtrack reticulations or vermiculations on its back and likewise on its dorsal fin, a feature that is possessed by none of the other trout, be certain that you have taken a brook trout (fontinalis). Also, if the scales are so small that you can scarcely see them with the naked eye, this is another brook trout characteristic, and identifies the fish. Other trout have noticea- ble scales, easily seen at a glance. The brook trout also has red spots on its sides, delicately circled with blue. The brown trout (Salmo fario) was not native to this country, but was introduced from Europe. It has none of the wormtrack markings on its back and dorsal fin, but has some red spots on its sides much like that of the brook trout, but larger. The rainbow trout (Salmo irideus) has none of the red spots on its sides, therefore will not be mistaken for either the brown trout or the brook trout. Its body is sprinkled with black spots in greater or lesser number. Its chief distinguishing mark from the other two trout is a reddish or purplish-red band from its gill cover along its side to its tail. Rock Bass Have Red Eyes What is a calico bass? This is a question that all too often comes up. The calico bass, or black croppie, is the northern representa- tive of the croppie species. The southern member is the common or white croppie which has been introduced into the north as the result of which it is now found over most of the range covered by the calico bass. The calico bass (Pomoxis sparoides) is sometimes almost black in color, so heavy are the blotchings of dark on its sides. The common or white croppie is but little marked, and is, sometimes, almost silvery. If you take a fish that has the shape of the sunfish, and very much the same in size, on the average, but which has red eyes, then be assured that you have taken the so-called "red-eye" or rock bass (Ambloplites rupes- tris), common to much of the eastern part of the country, and found in the south as well as the north. The rock bass has a yellowish- brown coloration, somewhat mottled. tacit Cet for your .22 rifle with sensational Kleanbore Hi-Speeds OU'LL take new pride in your shooting skill once you try the king of .22’s— Kleanbore Hi-Speeds. How they travel—flat, straight and true, With lightning-like get- away. With a business-like zz-zing. With a striking force 100 yards away that more than equals that of old-type low speeds at the muzzle! These .22 speed kings are built like big game cartridges —with solid brass cases. Strong—to hold the extra power of our special Hi-Speed powder. The lubricated bullet is special, too—extra hard for greater accuracy, greater strik- ing force (shoot hollow point Ii-Speeds if you want an ex- panding bullet). The quick-action priming is patented Kleanbore—non- mercuric, another exclusive feature. No matter how hot or moist the climate, Klean- bore will not fail. Harm your rifle barrel? Never! And that means no rusting, no pitting, NO BARREL CLEANING! SEND FOR FREE folder on Remington Kleanbore .22 Ammu- nition or, better still, get the information from your dealer who sells Kleanbore Hi-Speed Short, Long and Long Rifle Cartridges. Rem- ington’ Arms Company, Inc., 947 Seaview Ave., Bridgeport, Conn. Thank You for Mentioning Modern Mechanix and Inventions for Abril When Writing to Advertisers 131

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A microscopic battle. Didini- um attacking Paramscium. SEEING WONDERLAND With Bausch & Lomb amateur microscopes, you can see more detail, with the resolving power made possible only by precision optics. New Gem—Magnifies 75 to 172 diameters; to 300 diameters with extra lens ($2.50 more). In walnut case, with 20,000-word book, $14.50. Model R—Finest ama- teur optical system made. Magnifies 75 to 300 diameters. With walnut case and 455-page book, 350 illustrations (book alone $7.50)—all for $21.00. Interesting Litera- ture Free. Want it? BAUSCH & LOMB OPTICAL COMPANY 121 Lomb Park, ROCHESTER, N. Y. BAUSCH € LOMB ESKANOE|READY TO ASSEMBLE 75) Complete kilts including FREE PADDLE, with simple” plan for self-assem- bling. No experience needed, safest boat for children. Also cedar and folding KAYAKS, carry 1 to 4 persons, 10 to 20 ft. For Ries paddling, sailing, hunting & fish- 3 ing, non-sinkable, light, portable. fa Postage for catalog illustrating 16 Expert Kayak designer models & new self-assembling plan, and builder since 1924 KAYAK BOAT CO., 147 East 84th Street, N. Y.C. Complete Goggles Health pas ants 0 Rickets and Skin disor- 50 ers. Gives Sun-tan—Vi- tamin “D”. Automatic PIA MIOLET, ap Safety control. 110 Volt AC r DC. Free Details. BEYER MFG. C! o. Dept. B-4, | 4655 Lincoln Ave.. (\425-POWER 518.50 Produced by Lens Specialists Highest magnification you can buy at anywhere near this price. Fine optical quality, too— made by same experts who produce our world. famous movie and portrait lenses. Mag» nifications, 100 diameters to 425. Cor- rected for photomicrography. At deal- ers, $18.50. Or direct (check with order or C. O. D.) postpaid, under money-back guarantee. Other Models: 110 to 235-power, $15.50; 70 to 150-power, $12.50; 100-power, $5.00; Home Slide. «making Set, $3.50. IE Write for Free Catalogue Wollensak Optical Co., 822 Hudson Avenue, Rochester, N. Y, NA llensa “TELESCOPES WO MICROSCOPES 132 CHICAGO BINOCULARS How to Stain Your Microscope Slides [Continued from page 61] neutralize any remaining acid. The above method is known as regressive staining, since the color can be removed. Now pass the fabric into a clearing solution such as aniline oil or carbon xylol for twenty minutes, then into pure xylol for ten minutes. The specimen is now ready for mounting in balsam on a slide. Dozens of other staining solutions and methods, some simple and some highly com- plicated, are available for different subjects. Even dilute iodine and mercurochrome, available in any medicine cabinet, will give satisfactory results in many cases, and are used extensively by the amateur, Colored inks, food colors, and fabric tinting dyes may ae be utilized, though with uncertain re- sults. Turpentine may be used instead of xylol as a clearer just before mounting. 3-Tube Toolbox Portable Radio [Continued from page 128] the underside of the chassis; these are all bonded together by soldering a bus wire to them. This gives a well defined path for return of R. F. currents. The coil form is a 6 prong low loss type . made for short wave work. It fits into a six prong Isolantite socket, from which connec- tions are made to a four contact selector switch mounted on the front panel. The grid winding is tapped in four places to allow selection of four different bands. These taps are brought to four prongs on the coil form. Though the grid winding is continuous, it is in effect broken when the grounded switch arm contacts the different taps and shorts un- used coil portions to ground. The two remaining coil prongs are for the tickler winding; this is in one winding but distributed with different turns for different coil sections. Grid coil windings are spaced five-sixteenths of an inch apart. Tickler wind- ings must be wound and spaced between by these experiment. If oscillation cannot be obtained over a part of a certain band, push grid and tickler coils for that band closer to- gether. The coil may be removed and windings changed without disturbing parts or wiring. BLUEPRINTS for this three-tube toolbox portable receiver, showing clearly every detail of the sketches on these pages, are available to radio experimenters at 50 cents postpaid. These blue-line prints, on tough white paper, contain in addition a complete detailed list of the parts needed to build the set. Modern Mechanix Pub. Co., 529 S. 7th, Minneapolis, Minn. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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Try these Knock-Out Punches of Champions Can you knock any man cold with one blow? Its easy when 4 you know how to land these famous punches on the eight vital : points of the body! Learn them all for only 25c. Read this amazing offer! Win Any Fight with these Sleep-Producers Next time you find yourself in a scrap, just haul off and land one of these famous Knock-Outs. WHAM! The fight's over! Down goes your opponent. He's out! You walk off a hero. Yes, it’seas simple as that when you know how to hit—with the deadly knock-out blows of the great champions. A hundred wild swings don't do one- tenth the damage of any ONE of these paralyzing punches. Why take a licking when you can KNOW these amazing secrets of the knock-out? Now they are revealed so clearly and concisely that any man can quickly master them, For only 25c you gain the knowledge that may save you from insult, humiliation, ridicule—that may make you à CHAMPION 12 GREAT PUNCHES 95 Explained and Illustrated —All for No man living can stand up under the paralyzing effects of these expert yam wem wm um MAIL COUPON! E & m w m s punches landod on the vital points gof. the body: Here are the king i e unches of all the great masters—Corbett, Fitzsimmons, Kid McCoy, 1 * ark Johnson, Benny Leonard, Gene Tunney, Carnera—every punch i The Institute of Physical ae vagi Wet explained and illustrated—every move made clear, And here's an 55 East (1th Street, New York, N. Y. EXTRA SPECIAL GIFT: I Please send me at once a complete set of the 12 Chart showing the eight vital knock-out spots and Knock-Out Punches of Champions with Free Chart of FREE vulnerable points of the body. Tells you where to hit viral Points of Body. I enclose 25 cents in full pay- a man to render him helpless and unconscious. Rush Coupon—Offer Limited J sime s Only a limited number of these sets of Knock-Out Punches and Free Charts on hand. Don't miss yours! Mail the coupon or write, enclosing | Add a quarter, or 25c in stamps for your complete set. Money Back Guar- E33. a a en meii TG nas RINSE antee. The INSTITUTE of PHYSICAL CULTURE 55 East 11th St. Dept. W-4 New York, N. Y. W Town ............sseessseeee State ......ceees Raise Giant Frogs Up To 10007 Profit! START BACKYARD—ANY CLIMATE. Small pond starts big business. No experi- ence necessary. No equipment except fence, Raised in north and south. UNLIMITED MARKET—NO COMPE- TITION. Breeder lays 10,000 eggs (833 doz.) each year. Bullfrogs sell $1 to $5 per dozen. Biggest money-maker you can raise. Snecial Breed ''Nufond" Giants welgh up to 3 Ibs. each. SEND FOR FREE BOOK Get the facts on this new uncrowded industry NOW! Our big FREE illustrated book “A Fortune in Frogs" explains everything. Send post card or letter TODAY! AMERICAN FROG CANNING CO. “Originators of Canned Frog Legs" Dept. 119-D New Orleans, La. World’s LARGEST Frog Market

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Issue.) Minimum 10 words. April 30). A. C. GENERATOR TWENTY new practical changes for automobile generators. See our adver- tisement at bottom of page 29. Auto Power, Inc. DODGE 500-W self-excited A. C. generators $25. Chas. R. Hoge, 5348 Cornelia Ave., Chicago, Ill. ACQUIRABLE INFORMATION WHERE to Buy Anything—Manufac- tured, Wholesaled. 25c coin. (NAME. IT). King, 3223 Sixth Street, Harris- burg, Penna. ADDING MACHINES NEW $4.75 Automatic adding machine. Fuly guaranteed. Bassett, 1458L Hollywood Avenue, Chicago. ADVERTISING AGENCIES ADVERTISE: $15 reaches 6,000,000 readers with 24 word ad. Newspaper and mail-order magazine. Rate-Guide, free. Chicago Advertising Agency, 22 West Jackson, Chicago, ONE INCH Display 3 months, 40 magazines, $3.00. Halspence Ex- change-M, 509 Fifth Ave, New York City. ADVERTISE—24 words in 250 news- papers $10. Lists Free. Advertising Service Bureau, 4650 Drexel, Chicago, 24 WORDS in 50 newspapers, $2.00. Goodall Agency, Box 1592, San Fran- cisco. FREE NEW advertisers rate guide. Brown Advertising Agency, 140 South Dearborn, Chicago. AGENTS WANTED NEW marvelous electric light bulb gives strong, concentrated white light. Con- sumes 36% less current. Stores, fac- ity for right party. 110 East 23rd, New York. few dollars at home in spare time. Write to Mail Order Institute, 669-1, Marcy Ave., Brooklyn, N..Y. BIG MONEY and Fast Sales. Every owner buys Gold Initia!ls for his auto. You charge $1.50; make $1.45. Ten orders daily easy. Write for particu- lars and free sample. American Mono- gram Company, Dept. 11, East Orange, New Jersey. AGENTS: Smash go prices. Santos Coffee 12c lb. 4-oz. Vanilla 814c. $1.00 size Tonic 14c. Razor Blades 10 for 814c. 100 sticks Chewing Gum 12c. 150 other bargains, Experience unnecessary. Write Carnation Co., MN, St. Louis, Missouri. MAKE MORE MONEY Taking Orders Shirts, Ties, Underwear, Dresses, Hosiery, Raincoats, Coveralls, Pants, Uniforms. Outfit Free! Nim- rod Company, Department 132, 4922-2 Lincoln Avenue, Chicago. E START bargain store business. Tre- mendous profits, New and used clothing. Bankrupt and auction sale merchandise: Experience unnecessary, Everything supplied. Publix, 568-HE Roosevelt, Chicago. 134 Classified Advertisements Rate for classified ads, [5e per word (include name, address and, alt numbers) per insertion, ash must accompany order an e recelved in this office March for the i i Address Classified Mgr., Modern Mechanix and inventions, 150} Broadway, New York City. May eue" (On set SELL New and Used Clothing 100%- 300% profit! Satisfaction guaranteed. Experience unnecessary. We start you. Catalog free. Liquidation Merchandise Company, AK-550 East 43rd, Chicago. SELL Colored Folks: Hair Straighten- er, Bleach Cream, Perfumes, Incense, 300 Products. Write for Free Samples. Big Money Making Offer. Valmor, 5249-SM Cottage Grove, Chicago. BUILD Big Business—Making chipped glass name plates, numbers, signs. Re- silvering mirrors, metal plating, Il- lustrated booklet free. E. Palmer, 517, Wooster, Ohio. PENNY Each. Popular Sizes. Guaran- teed Window Sign Letters. Enormous Profits. Easily Applied. Free Samples. Atlas Sign Works, 7941-G, Halsted, Chicago. AGENTS clean up. Automatic cream siphon delights housewives. Particu- lars free. 20c coin brings sample. ASCO, Box 349-M, Frankfort, Ohio. GOOD Income Plating Auto Parts, Reflectors, Mirrors, by new method. Outfits furnished; free particulars. Gunmetal Co. Ave. A, Decatur, Ill. $$ LUMINOUS PAINT!! Makes Anything Shine in Dark! 1 Easily made! "Formula"—$1.00. T-S-G- Publ, Box Ten-M, Wilkinshurg, Pa. $75,000,000 Market for Firefuse Auto- matic Fire Alarm. Rings doorbell at 145 degrees. Sells dollar. Sample 35c. Goldenrule, Kalamazoo, Michigan. BIG MONEY applying gold initials on automobiles. Easiest thing today. No ex- perience needed. Free samples. ‘‘Ralco,” 1084 Washington, Boston. Mass. AMAZING, Healthful, Energizing. Hu-Tran-Aton plays radio through body, agent’s sample $1.55. Hu-Tran-Aton Co., 20 W. 22nd St., N. Y. CASH Income Daily Resilvering Mir- rors; Replating Metalware; Making Glass Signs. Portable Outfit. Sprinkle, Plater, 850, Marion, Indiana. REGULAR income, home, office, no canvassing, prospectus free. Niel's Specialty Sales, Box 6, East Rockaway, New York. AGENTS’ Gold Sign Letters for store windows. 500% profit. Free sample. Metallic Letter Co., 426 N. Clark, Chicago. AGENTS! Sell your own products! Bigger profits. Free literature describes all. Barretts, 4243 Keystone, Chicago. MANUFACTURE your own products. Free information. Guisinger, 1626 Que St., Lincoln, Nebr. FREE Literature describing many mon- ey making plans. Keeler, Chicago. REGULAR income; home, office. No canvassing. McArthur Co., Desk 19, Butte, Montana. 1000 BUSINESS CARDS cost $1.17. Sel $1.75. Brigshaw, 3214 Huron, Chicago. i D-Belfort, 4042 N. AIRPLANES BUILD 3-Cylinder aircooled Sportplane Motor. Half-size blueprints, $1. Parts Cheap. Allison Airplane Co., Lawrence, Kansas. ARTISTS ARTISTS-—Money for You. Complete information 10c. Straley, 1314M, Main, Springfield, Ohio. (New rate effective with April, 1935, AUTOMOBILES RACING NEWS from all American tracks—52 weekly issues $2.00, outside U.S. $2.50 (published since 1921). Na- tional Auto Racing News, Box 11, Nor- wood, Ohio. AUTOMOTIVE SEHVICE EQUIPMENT MICROMETER Reads outside every thousandths between 1%, 5 inches $1.00. Pick-up tool reaches inaccessible parts. Starts"bolts, etc. 30c. Agents Schaap, Springfield Gardens, Long Island. AVIATION ARMY Air Corps gives free flying training, salary, expenses paid. In- formation pamphlet, how to apply, 20c. Same information on Navy Aviation training, 20c. Information pamphlet, Marine Corps Aviation, 20c. All three, 40c. Used Airplanes $40 and up. Literature 10c. Continental Sales, Box 344A, Indianapolis, Ind. METAL tipped propellers; Fords, $9.98; Henderson, $8.50; Harley, un- tipped, $3.50; New Production Ships, $98.00; Improved LeRhone 40 H.P. motors, $127.00. Photos, information, and leather bound flying manual, 25c. Hibbs, Dept. 2, Ft. Worth, Texas. GET into Aviation. Air transport pilots get up to $7,000 per year; mechanics, $2,500. Learn at this government ap- proved school. Write for complete iñ- formation. State age. Lincoln Flying School, 4001 Aircraft Building, Lincoln, Nebr. AIRMINDED young men interested in entering aviation as apprentices. Write immediately, enclosing stamp. Me- chanic's Universal Aviation Service, A-13291 Ardmore, Detroit, Mich. LORENZEN Propellers for Airplanes, Ice, and Snowsleds, and Wind Driven generators. Large illustrated catalog, dime. _ Lorenzen Propeller Company, Niles, Michigan. HERE’S HOW! Complete, illustrated flying instructions, written by engineer- pilot; will save you many times their cost. Send $1 to Sinclaircraft, Box 182, Seattle, Wn. AVIATION Opportunity. Learn avia- tion mechanics at home by new method. For information send 25c. American Technical Institute, Box 59, Des Moines, Iowa. LeRONE Motor, 80 h. p. propeller, spare parts, unused. $90, car or motor- cycle. L. Brindley, 16 Langdon, Madi- son, Wis. BATTERIES PROFIT rebuilding batteries. Make your own plates. Information 25c (coin). Wind driver charger plans 25c. Gen. Batt. Service, 78F Glenwood, Minneapolis, Minn. BIG MAILS AMAZINGLY big mails—newest op- portunities whole year, 25c. Interna- tional Agency, M-4. Cincinnati. BIG Mails, Magazines, catalogs, propo- sitions, etc. Send 10 cents. Anderson Press, Box 3178, Miami, Fla. BUSHELS of letters daily bringing money-making opportunities! 25c. Mail- marts, M-4, Cincinnati. 100 BIG Mails during 1935, 25c. west, 4854 Reading, Cincinnati. Mid- Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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BLUEPRINTS AUTO RADIO blueprints, with plans for 6 tube set and vibrator type B bat- tery eliminator, sent postpaid for 50c. Other radio blueprint bargains listed in new M-M blueprint book, sent free for stamped, addressed envelope. Modern Mechanix Publ. Co., 529 So. 7th St., Minneapolis, Minn. SPEED-E-ARC Electric Welder. 75 ampere. Built from automobile gener- ator. Complete instructions and proven blueprints $2.00. C. M. Carlson, 2212 Grand Ave., Omaha, Nebr. BOATS LATEST Boat Sensation! New 20-Ib. Mead Sportsman's Ki-Yak assembled at home easily, quickly from complete factory-cut kit. $6 Paddle now given with yours—if you hurry! Rush dime for Catalog. Mead Gliders, Dept. MC.4, Chicago. CUT-TO-FIT Kayaks, Canoes, $6.95 up, complete. Catalog for dime, instruc- tions for quarter, refunded with order. Boat Shop, 737M, Greenville, Pa. BOOKS SEND stamped, addressed envelope for free copy of big M-M Blueprint book, listing many workshop books and blue- print plans. Modern Mechanix Publ. Co., 529 So. 7th St., Minneapolis, Minn. MULTIPLY or Divide any sized num- bers easily with The Math Pony. Dic- tionary of Numbers. For Business, School, Home. 90,000 Products. 212 Pages. $1. Box 1810-N. Milwaukee. BOOKS AND PERIODICALS BOOKS! Books! Books! No matter what you want in the book line, I can fill your order. If you can not find the books you want, send 25c in silver for my book cataloguc :oday. Levi Bryant, 654 East 44th St., Chicago, Illinois. BURIED TREASURE TREASURE Seekers—Learn scientific methods, Wyss, 104% Francis, St. Joseph, Mo. BUSINESS OPPORTUNITIES THE PLASTEX Industry needs manu- facturers on small scale and for big pro- duction of Art Goods, Novelties, Souve- nirs, etc. in Plastex and Marble imita- tion. Experience unnecessary. 2c ma- terial makes 25c articles. Rubber moulds furnished for speed production. We place orders and buy goods. Small in vestment brings big returns. Interest- ing booklet mailed free. Plastex Indus- tries, Dept. R, 1085 Washington Ave., New York. LEARN Rubber Composition mold mak- ing. No heat. No machinery. Inex- pensive, durable. Great for novelty manufacturing. Imitation marble for casts, decorating, etc. All branches mar- bleizing and mold making taught. Dime brings mold and cast, rubber material for testing. assorted samples. Litera- ture. Cowell Institute, Grayling, Mich. MEN-WOMEN. Start making Donuts, Potato Chips, Salted Peanuts. Experi- ence or expensive macbinery unneces- sary. Full particulars and instructions $1. Joyce Aid Co, Murphy Bldg., Salem, Ohio. LIQUID MARBLE — Anyone can make! Colorful, glazed! Molded, brushed, sprayed. Rubberlastic molds. Composition flooring. Big money mak- ing these! Particulars free. Marbleiz- ing § Service, Edwardsville, Illinois. “LEARN all about casting marble novel- ties in rubber moulds. Cement secrets. Illustrated catalog and beautiful samples 3c. (So. Calif. business reserved.) John H. Payn. 945 Grande Vista Ave- nue, Los Angeles, Calif. Thank You for Mentioning Modern Mechaniz and Inventions for April When Writing to Advertisers COMPLETE Chemical Service, Analy- sis, Formulas, Consultations. State Licensed Chemist. Twenty-five years’ experience. Write for literature. W. L. Cummings, Ph.D., 428 Gordon Avenue, Syracuse, N. Y. IF you have some "Spare room, a base- ment or garage where you can do light work, see our offer to Branch Manu- facturers on page 145. Metal Cast Prod- ucts Co., 1696 Boston Road, New York City. BUILD Battery Electric Plants. With washer engine, Dodge generators. Oper- ates lights, washer, water system. Build new batteries from old. Enclose stamp. Battery Laboratories, St. Paul, Minne- sota. START a profitable mail order business of your own. Pays up to $200 weekly. Capital or experience unnecessary, valu- able introductory booklet free. Mail Order Service. S. Bound Brook, N. J. FREE PAMPHLET describe 87 money making plans. Earn $20-$100 week. Your own business. Home or office. C & B Sales Company, 1580 Sherman Ave., Evanston, Ill. EARN while learning—men—women— your own Cleaning—Pressing Business. Easy home training. Free Outfit Offer. D-52, Dusiness Ownership Institutes, 2400 W. Madison, Chicago. $0.50 BRINGS Plans for America's Fastest Selling Novelty. Material cost about $0.10. Sell for $5.00. Is not Junk. Bob's Shop, 927 High S. W., Canton, Ohio. SOAP Making, Disinfectants, Insect Spray, Deodorants, Cleaning Com- pounds. Learn at Home. No Machin- ery Needed. C. Alexander, Sta. F, Milwaukee, Wis. OPERATE Chain of amusement machines. Be independent for life. Start small, grow big. M. Goodbody, 1826 East Main St., Roches- ter, N. Y. OPEN a key-making shop. Start a per- manent, profitable business with a small sum. No skill necessary. Write for par- ticulars. Beisser Mfg. Co., 419 E. Fort, Detroit. Mich. START Now. Make extra $1,000 next summer. Million bottles sold. Big Profits. Sunburn Remedy Formula 50c. Eastern Products, Box 115, Biddeford, Maine. CASH: Listing Local Names. Inter- esting spare time home occupation. Complete working plans 25c postpaid. Publishers Bureau, 850 East 47th, Chi- cago. THAXLY Technically-Tested Formu- las, Practical Processes, Chemical Con- sultation. Analytical Service. Catalog free, A. Thaxly Co.. Washington, D. C. MONEY without canvassing! 3c stamp brings copy 60-page magazine spare- time opportunities, plans. $1 year. Ward M. Smith, Fergus Falls, Minn. SIGNS and Showcards Easily painted with Letter Patterns. J.arge variety of styles and sizes. Write for free samples. John Rahn, B-2120 Neva, Chicago. SOMETHING New. Make money building and installing burglar alarms; a real protection. Instructions and draw- ings 50c. Hodges, Waukegan, Ill. HOW would you like to receive 100 letters a day, each containing a dime? Will send plan for 10c. Carl Greiner, 5112 N. Oakley Ave., Chicago, Ill. FASCINATING, Profitable, Easy— Make tumblers, vases, dishes, etc. from bottles. — Illustrated instructions 25c. Henry Estberg, Waupaca. Wis. EXTRA DOLLARS daily at home. Sample with your name and address; instructicns, 25c. Art Service, 35 Second Ave., Newark, N. J. CASH Income Daily Resilvering Mir- rors; Replating Metalware; Making Glass Signs. Portable Outfit. Sprinkle, Plater, 845, Marion, Indiana. MEN, Boys, for 25c I will send you a plan that brought me 100 letters a day, each containing a dime. 4898 Di- vision Road, Dearborn, Mich. 10,000 MEN Wanted to Supply Tourist Information on 1935 Highway Specials. Layouts, Assignments, 25c (coin). Ap- ply Box 2621, Tulsa, Oklahoma. LEARN How to make Money. Send for “Pointers on How to Make Money,” free. Wm. M. Wells, 5624 Hub St., Los Angeles, California. WOULD you like to receive $10 a day? I wil tell you how, and send a new Plan for 10c. B. Daniels, Box 315, Chester, Mass. CASH Each Week furnishing names— addressing postals. Contract-details, for dime and purple stamp. Frederick, A-8, Chesterhill. Ohio. . RECEIVE 100 Dimes Daily through mail. Three formulas and plans, ten cents. D. Imson, 133 81st, Niagara Falls, N. Y. UNUSUAL Opportunity! Send 10c coin and receive 50 guaranteed money- making plans. Sales Service, Belleville, Kansas. inner Instructions 12-AK, Norwood, READY Cash from discarded tubes and drained auto oil. 25c each. Charles,” Ohio. vending ` and BIG MORNING MAILS, 3 months, 10c. Propositions, Premiums. Hen- ean 141-M Garson, Rochester, AMATECR cartoonists, earn $25.00 week, spare time, copying cartoons for advertisers. Three-M Syndicate," Argyle, is DOLLARS made at home; 53 success- ful money ideas, rush 25c. Fortune Products, R. D. 26, Garrettsville, Ohio. CASH! Operate profitable spare time. Mail business, Complete plan 25c. Home, 1635 Bender Ave., Hamilton, O. AMERICAN Homeworker Magazine. 50 pages opportunities! Three months’ trial, 25c. Mailmarts, M-4, Cincinnati. SELL by Mail! Books, Novelties! Bar- gains! Big profits! Particulars Free! H. Elfco, 525 South Dearborn, Chicago. ONE “Pyramid” Plan completed pays you $2,952.00. (Homework). Plan 25c. International Agency, M-4, Cincinnati. GET Barrels of Mail, Your name in 10,000 Opportunity Directories, 25c. Roservice, 4627 Glenshade, Cincinnati. AMERICAN Homeworker Magazine, 50 pages opportunities. Three months’ trial, 25c. Mailmarts, M-4. Cincinnati, 3 PRACTICAL Methods of starting a business, 25c coin. Not formulas. C. Sherman. Station "C", Milwaukee. Wis. LARGE, steady profits. Make products yourself. Catalog free. Allied Re- search, 2217 N. Kilbourn, Chicago. COPY of money-making plan. 100 dimes a day. Enclose 10c. E. Binkelman, 4626 Scotten Ave.. Detroit, Mich. MAKE PRODUCTS yourself. Tested formulas — catalog free. Grinstead Laboratory, Edwardsville, Illinois. HOMEWORK Opportunities from everywhere all year! 25e. Bluegrass Bureau, M-4, Newport, Ky. STEADY Income from drained auto oil! Instructions 25c. International Agency, M-4, Cincinnati. FREE Radios—-make money giving them to friends—details 10c. Ferguson, 2840 Bailey, New York City. WHOLESALE Supply Sources, half million items! 10c. International Agency, M-4, Cincinnati. 135

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INVENTION Finance Magazinette, 5-H Beekman Street, New York. Sample copy sent upon request. TATTOOING Outfits, Supplies—Cata- CARTOONING CARTOONING Course—30 lessons, 500 Illustrations, with drawing pens and pencils. Postpaid. Complete $1.00. cen Studios, Box 610-M, Hollywood, alif. logue. Guaranteed Remover. "Waters," M-965 Putnam, Detroit. PARTNER Wanted! Help Operate Profitable Mailorder Business. Duffy- Co., Covington, Ky. FOR UNEMPLOYED. Guaranteed taoney making plan. 25c (coin). Box 135, Auburn, Maine. EARN $20.00 per 1000 mailing circu- lars at home. Write, Euvico, 434 Wal- nut, nut, Statesville, N.C. CASH Earnings positively guaranteed! No canvassing! Rush dime. Mailmarts, M-4. Cincinnati. COLLECT Old Spark Plugs. Worth 3c. Details 10c. Goldenrule, Kalama- zoo, Michigan. BIG handful of new formulas! Quarter brings them today. Dowling, Dunellen, New Jersey. NEWSPAPER Clippings Pay. Infor- mation 25c. Goodall, Box 1592-P, San Francisco. MAKE mirrors from old. window glass. Complete instructions, 25c. Westcott, Clyde, N BE INDEPENDENT, Easy money- making plans 20c. Dowling, Dunellen, New Jersey. MEN-WOMEN interested earn money home, write Eller, F-277 Broadway, New York. DOLLARS Daily! other offers, 10c. Cincinnati. "SELL Neat Letterheads. 1000—$1.99. Dodds-V, Cedar Rapids, No Selling, Facts, Int’nat’l Agency, EARN $5 Daily. Instructions 25c. Pettit, 1379 Teller Avenue, New York. $$$$ $40,000—I made it. Plan 10c. *"Moore-Made," Lapeer, Mich. MAKE $10 daily. Instructions 25c. Wm. Snow, Webster, N. Y. CAMERAS AND PHOTO SUPPLIES INCOME From your camera instead of expense. Low cost home course teaches you to make photographs for magazines, newspapers, advertisers. Tremendous demand. Earn good money wherever you live. Free book. Universal Photog- raphers, Dept. A, 10 West 33rd St.. New York. FREE Photographic listing thousands of money saving values in Cameras, Lenses, materials, for still or movie pictures. Complete line at lowest possible prices. Central Camera Co., Dept. J4, 230 South Wabash, Chicago. ALL-PURPOSE Camera, enlarger, and photo-taking equipment plans are in 1935 How-To-Build-It, 146-page book of home and workshop projects. Price 50c. Modern Mechanix Publ. Co., 529 S. 7th St., Minneapolis, Minn. MAKE Money in Photography. Learn quickly at home. Spare or full time. New plan. Nothing like it. Experience unnecessary. American School of Pho- tography, Dept. 2046, 3601 Michigan Avenue. Chicago. CANCELLED STAMPS WANTED WE BUY used postage stamps from ordinary mail. Booklet (instructions, prices) 10c. Stamp Exchange, Dept. 53-A, Backbay Annex. Boston. CARNIVAL GAMES Bargain Book ae MAKE you money—Outfits supplied, catalog 10c. “Mooremade”, LaPeer, Michigan. 136 BIG list cartoon buyers, syndicates, etc., 25c. Cartoon Market Guide, 3235-R Jefferson, Cincinnati. Ohio. CHALK TALKS LAUGH Producing Program, $1.00. Catalog free. Balda Art Service, Dept. 65. Oshkosh. Wis. CHEMISTRY FASCINATING Chemistry Magazine contains loads of Experiments, News, Problems, Queries, Jokes. 5 cent stamp brings sample, Chicago Press, Dept. 105, 158 Carroll Ave., Chicago, CHEMISTRY Magazine (Illustrated). 3 months 25c. 1015 High, Petersburg, Virginia. COIN CARRIERS COIN Carrier Order Blanks. Easy, quick, safe method of sending money. Package 10c. Kraftguild, Lawrence, Kansas. DETECTIVES DETECTIVES. Make Secret Investi- gations. Experience unnecessary, De- tective Particulars free. Write, George Wagner, 2640-V Broadway, N. Y. DECOME a successful detective. Par- ticulars and Detective Paper Free. National System, 340-D Electric Bldg., Omaha, Nebraska. BE A Detective. Make secret investi- gations. Experience unnecessary. Write United Detective System, 1623 W. Grand. Chicago. DISTRIBUTORS WANTED DISTRIBUTORS: A few quick easy sales dary nets you $58.00 weekly. Represent manufacturer—Latex—amaz- ing self-sealing bandage that breathes. Wonderful demonstrator. Irresistible appeal. Exclusive territory. Neway, :24-G So. Clinton, Chicago. STATE and District wanted for carded Kil-Rat. Send 45c for sample card. on first order. River, Missouri. DOG TRAINING "DOG Training for Home and Stage," by Monty Collier, famous dog trainer contains over 80 interesting tricks, les- sons in obedience, guarding, etc. 224 pages illustrated. At Public Libraries or order direct $1.50 postpaid. Scovell Publishers, Box 610-N, Hollywood, Calif. Distributors Good profit. Refunded Farm Products, Flat DUPLICATORS INCREASE Business. “Excellograph”’ Rotary Stencil, Clay, and Film Duplica- tors $3.85 to $37.50. Prints anything typewritten, penned, drawn, traced. Colors, Folder Free. Pittsburgh Type- writer Supply, Suite 519, Pittsburgh, Pa. DUPLICATORS. Cost 75c to make. Instructions 25c. Joyce , Aid Co., Murphy Bldg.. Salem, Ohio. EDUCATIONAL USED Correspondence Courses and Educational Books sold or rented. In- expensive. Money-back guarantee. Write for Free Catalog Listing 4000 bargains. (Courses Bought). Lee Mountain, Pis- gah. Alahama, ELECTRICAL EXPERIMENTS EXPERIMENTERS, students, home- builders, instructors, C.C.C.'s Scouts. Electrical kits free (almost). Enter- taining, educational, useful. No toys. Write Engineering Service Company, 3722 A Street, Lincoln, Nebraska. ELECTRICAL SUPPLIES INSULATION, Wire, varnishes, sup- plies, etc. Send 3c stamp for bulletin. Auto Power, 412 S. Hoyne Ave., Chi- cago. FARM LANDS FREE homesteads, some improved, for- feited; 18 states. Maps '700 Facts," $0.40, Box MY33, Modern Mechanix, 1501 Broadway, New York Citv. FINGER PRINTS FINGER Print Outfit $1; Professional in Wooden Case $2. American System, 219-F West 100th St, N. Y. FIRE ALARMS HERR Fire Alarms, operate, electric, doorbell; 75e each. Collinsville, Illinois. FIRE ARMS GUNSMITHS' Secrets—Bluing, check- ering, engraving, etc., 25c. Interna- tional Agency, ,M-4, Cincinnati. FREE! Gunstock Checkering Tool. Send Dime for Postage, Packing. M- Duffy, Covington. Ky. FISHING SUPPLIES MAKE Dipsies for use or profit, Free folder. Reading Instrument Co., Read- ing, Pa. FLY & LEADER MAKING and materials. Paul 8065-4 Grand River. Detroit. Mich FOR BOYS AND GIRLS BASE BALL, build exciting game of skill batting home runs, pitching strike outs. Plan, instructions, rules, $0.25 coin. If wanted game ready to play, $2. Charles E. Wood, Highland, FOR INVENTORS INVENTORS: Send immediately for your copies of our new Free books, “Patent Protection" and ‘Suggestions on Selling an Invention", Sixty-eight pages of interesting facts. They tell how Patent Laws protect you; kind of sketch or model needed; simple Steps to take without cost; how successful inven- tors have secured financial assistance; show interesting inventions; illustrate important mechanical movements. With books we also send Free Evidence of Invention form to help establish date of disclosure. Prompt service, reasonable Íees, special deferred payment plan. Strictest secrecy. Thirty-six years’ experience. Highest references. Write us today. The facts in our books are worth money to the man with a good invention. Address: Victor J. Evans & Co., Registered Patent Attorneys, D Victor Building, Washington, PATENTS—Before too heavy an out- lay of time or money is made on an invention, a search of the Patent Office records should be made to determine as nearly as possible whether or not the same idea has been patented before. The cost of this search is small, while the value of the facts it uncovers is often considerable. We offer inventors and manufacturers a thorough, prompt, con- fidential search service—plus experi- enced counsel and assistance in every phase of Patent and Trademark practice. rite for my new free book containing valuable information relating to patent procedure. Clarence A. O’Brien, Regis- tered Fatent Attorney, 28-T Adams Building. Washington, D. C. INVENTORS: A service never before offered for the protection of patentable ideas. Your smallest ideas may have great possibilities. Don’t delay in send- ing $1.00 immediately for information and forms giving you absolute protec- tion in government dating of conception of idea. E. L. Wickham, Dept. A., 205 E. 42nd St., N. Y. C. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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INVENTORS—Go "'sight-seeing"" into mechanisms of famous inventions. Our collection of patent copies fully illus- trates and describes. New ones weekly. Broadens conception. Fascinating—and inexpensive. Free illustrated folder for stamp. Patent Copy Service, Box 239, Ephrata, Penna. YOUR INVENTION will work if you get the right speed, weight, temperature, pressure, strength, etc. Let an engineer figure it out. Very reasonable. Abso- lutely confidential. James Bryant, Jr., Port Huron, Mich. DESIGNING, drawings, blueprints, working models, commercial develop- ment of inventions, Reasonable prices. Satisfaction guaranteed. Engineering Service, 1519 Crescent Ave, Ft. Wayne, Indiana. INVENTIONS now salable before patenting. Safe, practical. What have you? Chartered Institute, Dept. 5, Barrister Building, Washington, D. C. INVENTORS—Sell your inventions before patenting. Free particulars. Write W. T. Greene, 942 Barrister Building, Washington, D. C. INVENTIONS—patented, unpatented. Bought outright, royalty. Write Arel- lano-Power Company, 160 North La- Salle St., Chicago, Ill. PROTECT your idea! Forms and in- structions 25¢ (coin). Write E. H. Neuser, 924 Buffalo St., Manitowoc, Wis. INVENTORS—Large list, inventions buyers and wanted inventions, 25c coin. Theo Hines, Chapel Hill, Texas. LEARN why most inventors fail, 25c coin, Hanchock Laboratory, 3943 Oliver St., Detroit, Michigan. FORMULAS 425 TESTED Chemist Formulas (du- plicate standard household, medical, Cosmetic, auto specialties—easily, cheap- ly.) $1—$100 sellers! Mfrs., Agents, Mail Order Supply Directory. 42 sec- tions successful miscellaneous money making schemes, advertisements, gen- eral information—in new, enlarged “Twentieth Century Business Encyclo- pedia.” $1.00 postpaid. Interesting folder for stamp. A. K. Fuller, Box 1144A, Kalamazoo, Michigan. SENSATIONAL discovery. Send 10c for package of Fixall, mends everything in household and factory. Simple for- mula making plastic wood 25c. Hopps Laboratory 286, Wythe Avenue, Brook- lyn, New York. i READ “Spare-Time Business Builder" —Money-making Plans, Formulas each issue. Copy 10c. Halspence Ex- change-M, 509 Fifth Ave, New York City. THAXLY Technically-Tested Formu- las. Practical Processes. Chemical Con- sultation. Analytical Service, Catalog free, A. Thaxly Co., Washington. D. C. RECOVER Gold from Gold Plated Articles With Acid and Electricity Formula $1.00. Joseph Dorsney, Sta- tion J, Box 2614, Philadelphia, Pa. HARDSCRABBLE RELISH — Ideal for home manufacture. Formula, work- ing plan $1. Acorn, 3521 Wallwerth, Toledo, Ohio. GOLD. Produce artificial gold by new method. Complete formula, $1.00. Mavis Mailway, 709 S. Monroe, Bay City, Mich. [tt ANY FORMULA 50c! Three $1.00! Guaranteed! Personal Service! ! T S G Publ: Box Ten-M, Wilkinsburg, a. TESTED FORMULAS — Newest, guaranteed! Catalog free. Grinstead Laboratory, Edwardsville, Illinois. GET Reliable Formulas and scientific information. Catalog free. Church & Galle Laboratories, Marissa, Ill. 525 PRACTICAL Formulas 25c. Profitable Literature free. Pelishek's, Adell, Wisconsin. PROVEN Formulas. Practical Busi- ness Plans. Big special offer. Barrett's. 4243 Keystone, Chicago. MONEY-MAKING formulas. Litera- ture free. Mitchell, 2506 52nd, Keno- sha, Wisconsin. ANY Formula or Process 25c. Buchman, 614 New York. FORMULAS—AIl kinds. Catalog Free. Illinois. Louis E. Jefferson, Syracuse, Kemico, 67, Parkridge, 50 FORMULAS 10c each. Mitchell’s, 10407 Lexington, City, Mo. DRUG Product Formulas! New Lists 10c. Continental, 3542 Polk, Chicago. FORMULAS — Interesting literature free. D-Belfort, 4042 N. Keeler, Chicago. ANY Guaranteed tested formula 35c. Kaplan, 13 S. Eden. Baltimore. GUNS, FISHING TACKLE & SPORTING GOODS NEW Rifle Muffer $3.50. Makes 22 sound like air gun. Stops flinching, improves accuracy. Spencer Labora- tories, Akron. Ohio. HELP WANTED MEN Wanting Jobs on new construc- tion work in United States, South America, other countries, write E. Moore, 1892 Hunter Bldg., Chicago. Enclose Stamp. HYPNOTISM HYPNOTIZE Instantaneously! Learn how! Instructions 25c. Lonk Institute Hypnotism, D-1313. Palatine, Illinois. INSTRUCTION WORK FOR “Uncle Sam”. $105.00-$175.00 month. examinations expected. Steady work. Men-women, 18-50. Common education usually sufficient. Qualify immediately. List positions, sample tests and full particulars—Free, Write today sure. Franklin Institute, Dept. N-88, Roches- ter, N. Y. Start Many Spring Guaranteed. |: SMALL inventions wanted. A. Hull, 7829 Euclid Avenue, Cleveland, Ohio. KEYS SET of Five Master Keys. Opens thousands of locks. 50c postpaid. Fixit Shop, Bristol, Tenn. MACHINERY, TOOLS AND SUPPLIES MAKE Your Own Workshop, Motor, Lathe, Drill Press, Saw, Planer, Shaper. Complete specifications—$1.00. Stark Engineering Co., 616 Holland, Erie, Penna. BIGGEST Bargains! -Bankrupt and surplus stocks, supplies, materials, spe- cialties, for shop, factory, home. List 5c. Kostka, 2358-P South Crawford, Chicago. CONSTRUCT accurate Machine Tools inexpensively. Blueprints 20c. Krait- guild. Lawrence, Kansas. BARGAINS: Used service station, garage equipment, Fesco, 3117 W. Roosevelt, Chicago. MAGIC TRICKS & NOVELTIES REVERSE Friends Vest, Without Re- moving His Coat. A good parlor trick! Instructions 10c. E. Sprague, Everson, Wash, SPECIAL, Magic Book. Detect Proof Card Trick, Send Dime. Penn, 950 Saint Marks Avenue, Brooklyn, N. Y. FUN! ‘13 Funny Love Letters,” 10c. Funny Fads for Funny Folks, 10c. Stukes-d, 2112 Venus, Jacksonville, Fla. ANTIMONY Elephant, Table Cigar or Cigarette Lighter 50c. Albert C. Carn- cross, 304 Dearborn, Buffalo, N. Y. THREE Magic Tricks—10c. Other lists free. Ock, 5728 13th Court, Kenosha, Wis. MALE HELP WANTED MEN WANTED at once to call on stores with newest line self-selling 5c and 10c necessities. Strong, original counter displays. Aspirin, Mercuro- chrome, razor blades, household cement, etc. Automatic sellers. Many new items. Up to 125% profit. Big catalog Free. Procopax, Dept. 95-HD, 1956 S. Troy, Chicago. MARRIED Man with spare time to dis- tribute free samples coffee, flavoring, food products and make customers. Must devote at least two hours daily and be satisfied with up to $3 in an hour. test for steady Government Jobs; com- mence $105-$175 month. Common edu- cation, paid vacations, pension. Valu- able information from our Civil Service Expert mailed Free. Write Instruction Bureau. 234, St. Louis, Mo.. Today. INVENTIONS products. Ear] & Koehler Mfg. Company, 1147 Ne. 31st Avenue, Portland, Oregon. SOUND, practical inventions, patented or unpatented, wanted by our manu- facturer-clients. Write Chartered In: stitute, Dept. 5A, Barrister Building, Washington, D. C. INVENTIONS developed, manufac- and financed. ss Engineering Co., Bliss Building, Tulsa, Oklahoma. INVENTIONS are the wealth and independence. you? Write National Service Bureau, Dent. H.. St. Louis, Mo. Permanent. Blair, Dept 623-D, Lynch- burg, Va. WANTED: Names of Men Desiring Outdoor Jobs; $1,700-$2,400 year. trol parks; protect game. Write imme- diately for details. Modern Institute, M-32, Denver, Colorado. EARN Quick Cash Raising Mushr»oms in cellar, shed, attic. We buy crops. Guaranteed materials furnished. lasy Odorless method. Book Free. United, 3848-BC Lincoln Ave., Chicago. . FOREST Jobs easily available, $200 month. Cabin. Hunt, trap, patrol. Get details immediately. Rayson Service, K-32, Denver. Colorado. MALE—INSTRUCTION DETECTIVES. Work home or travel. Experience unnecessary. Write, Ameri- can Detective Institute, 2640-T Broad- way, N. Y. Pa- MANUFACTURERS MANUFACTURING, Models. Dies, Stampings, Brasswork, Moulds for Cast- ings, Vulcanizing, Catalog free. Baum’s Metal Specialists. Kansas City, Mo. MICROSCOPES START Your Own Business. 50 money making formulas. Send two dimes. Rehm's, 34 Nichols St., Bridgeton, N. J. INVENTIONS Commercialized, Pat- ented or unpatented. Write Adam Fisher Company, 582 Enright, St. Louis, Mo.l M Thank You for Mentioning Modern Mechanix and Inventions for A bril When Writing to Advertisers PREPARED Microscope Slides 15c. Sample and list 10c. Box 481, Salem, oO. 137

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MINES & MINING MOJAVE Gold Strike! Ore samples from rich Silver Queen make a valuable and rare keepsake. Will attempt to an- swer any question on this district. En- close stamped envelope. Cost two dimes. Ralph Crawford, 7922% Norton Ave., Hollywood, Calif. MINIATURE AUTOMOBILES 20x4” MINIATURE Auto Wire Wheels for Ford Spindles $6.95 each. Karl Ort, 540 W. Poplar, York, Pa. MISCELLANEOUS RADIOLITE Enamel Shines in the Dark. Make watches, clocks, electric switches, push buttons, dropcords, and other articles visible in the dark. Price 25c postpaid, complete with fine brush and instructions. —Radiolite Products Co.. 911 N. Sixth St., St. Louis, Mo. BLACK LIGHT--Reveals the invisi- ble, tests minerals, chemicals, shows forgeries. Filter, bulb, blueprint, fluo- rescent specimens $2.00. Argon U-V lamp, 5 specimens $1.00. Catalog 10 cents, free with order. Laboratory Spe- cialities, Wabash, Indiana. SPECIAL Price on some hardwood tractor propellers for auto engines. Write us your needs. whether it be for Airplane, Sled, or Boat, we may have it at a bargain. Senscaich Brothers, Lititz, Pa. MAKE electric pencil for wood, etc., re- newable element, Battery or 110 volts, materials and instructions 25c. The Junior Craftman's and Experimenter's Service. Box 693, Wakefield. Michigan. WANTED: 100 New Writers wishing work on Newspapers, Magazines. FREE information. Enclose stamp. Press Association, 3806 Beverly, Los Angeles. California. BETTER shaves at no cost, no shaving creams nor substitutes to buy. Use your own razor, further particulars for stamped envelope. Box 1205, Richmond, California. WE PURCHASE All Indianhead Pennies. Send 10c for catalogue of prices we pay. Photonumismatic, 100 Forsyth, New York. 1000—8 14x11 Multigraphed letters with 3-line plain, printed letterhead. Bond Paper. $5.00 Postpaid. Bredin, 42 North Yorktown, Tulsa, Okla. ANY QUERY pertaining to sports re- liably answered. Enclose one dime. Sports Information Bureau, 4626 Scot- ten Ave., Detroit, Mich. SPECIAL. 69 useful household items for sale at 3c each. Bargain price list Free. Novelty House, Dept. 483, Muskogee. Okla. ORIGINAL Sketches of Film Stars by Clever Artist, $1. Colored $1.50, Minia- tures 10c. Alvin Ash, Hedley, B. C., Canada. ALL International legal matters. Lic. Victores Prieto, Mexican Attorney at Law, 213 Juarez Avenue, Juarez, Mexico. : AMATEUR Artists, make your hobby pay you cash, Fifty cents brings guar- anteed plan. Adrian Savage, Durham, Kansas. BIGGEST mail you ever received for 25c or your money refunded. W. Eness, Box 315, Muskogee, Okla. INDIAN Relics. Beadwork. Coins. Curios. Catalogue and arrow, 6c. Ver- non Lemley, Northbranch, Kans. IMPORTED Jewelers’ saws (Laubsag- en) $.60 gross postpaid. Hartmann, 8907 244 St.. Bellerose, N. Y MIDGET Electric Motor. Complete with directions 20c. Gordon Hafer- becker, Antigo, Wis. 138 BAR Bells. Make your own. Small cost. Plan 25c. Williams, 5304 New- port, Detroit, MUSIC Composed to words. Wonder- ful proposition, Bauer Bros., Oshkosh, Wis. MODEL MAKING MODEL Makers—Brass, copper, fibre, Steel and aluminum in all shapes, also castings, gears, screws and fittings. Catalog 10 cents. Experimenters Supply House; Dept. M, Box 10, Station Y, THE MODELMAKER. The magazine ior those interested in building mode. railroads, boats, engines, Send 15 cents for copy. Modelmaker Corp., 98M East Main St., Bay Shore, N. Y. MODELS AND MODEL SUPPLIES ENGINES, Steam & Gas 1/10 HP up. Models, Miniature & Practical. Boilers, Pumps, Machinery, Mechanical Books. Engine Castings & Blueprints. See cata- log No. 34. For Experimenters, Model- makers materials & supplies get catalog No. 35. Either postpaid 20c. Canada 30c. Refunded first order. Circular Free. Evraymesco, 28 No. Clinton, Chicago. YOUR Ideas developed into practical working model. 30 years successful experience; thousands satisfed custom- ers. Confidential service guaranteed. Bank references. Send 3c postage for 32 page book *Making Inventions Pay.” Crescent Tool Company, Dept. T. Čin- cinnati, Ohio. OVER 50 engines; castings for Loco- motives, Gas, Steam Engines; Electrical Motors, Generators, Model Fittings; Miniature Valves—duplicates of large ones. Model screws. Bend 25c for No. 17 Catalog. Canada, 30c. Refund on lst order. Howard, 2417 N. Ashland Ave., Chicago. BIG PACKAGE of model airplane samples. Send dime for packing and postage. Aero Shop, 3050 Hurlbut Ave., Detroit, Michigan. MONEY MAKING MONEY from Waste Materials. Tn- structions, Blueprints, 19c. Lawrence, Kansas. MONEY MAKING IDEAS NEW Book—“1,000 Spare Time Money Making Ideas"— $1.00. Guaranteed satisfactory or dollar refunded. New England Exchange, 12 Backbay Annex, oston. Kraftguild, MOTION PICTURES 8MM FILMS: Mickey Mouse, travel, others. List for stamp. Lincoln Film Service, Box 293-C, Saginaw, Mich. HOME MOVIES—Guaranteed outfits. Cine Picture Service, Box 94-M, Mc- Gaheysville, Virginia. 35MM Features $6.00. Cartoons $3.00. Projectors. Marsala Company, Hills- dale. New Jersey. MOTOR WINDING DATA MOTOR winders: winding data, 100 A.C. motors, special selection, various horsepower and voltage, $1.00. Motor SEND 15c for illustrated used Motor- cycle catalog. Large stock. Bargains. Indian parts. Accessories, Indian Mo- torcycle Sales, Kansas City, Missouri. ALLOY Pistons. Harley, Henderson, Indian, Excelsior. Used parts, catalogue and wings pin 10c. Ballak, 100 N. 12th, St. Louis. Mo. MUSHROOM GROWING GROW Mushrooms All Year Round—a steady income indoors, in cellar, shed or stable. Exclusive new process. Bigger, better, quicker crops--more money for you! Book free. American Musliroom Industries, Dept. 169, Toronto, Ont. M ISICAL INSTRUMENTS NEW, simplified, really easy method to play Piano Accordion. Clarke Fertuer's First Five Lessons. a new chart system, teaches you to play melodies in just a few hours’ time, Price $1.90 postpaid. We arrange free practice with nearby music dealer. yr acuen guaranteed. Chicago Musical Justrument Co., Ac- cordion Dept. D, 3U9 So. Wabash, Chicago. OLD GOLD WANTED CASH for Gold Teeth, Jewelry, Watch- es. 100% full gold value paid day ship- ment received. Satisfaction absolutely guaranteed or articles cheerfully re- turned. Licensed hy United States Government. Information free. Chi- cago Gold Smelting & Refining 'Co,, 331 Champlain Bldg. Chicago. CASH for old gold teeth, crowns, bridgework, jewelry, watches. I pay the most because I refine into dental gold. Satisfaction guaranteed or shipment re- turned. Licensed by United States Government. Dr. Weisberg’s Gold Re- fining Co., 1580 Hennepin Ave., Minne- apolis, Minnesota. OLD MONEY WANTED $5.00 to $500.00 EACH paid for Old Coins. Keep all old money. Get posted. Send 10 cents for Illustrated Coin Value Book, 4x6. Guaranteed Buying and Selling Prices. Coin Exchange, Box 18, Le Roy, N. Y. PATENT ATTORNEYS INVENTORS: Send immediately for your copies of our new Free books, "Patent Protection" and "Suggestions on Selling an Invention". Sixty-eight pages of interesting facts. They tell how Patent Laws protect vou; kind of sketch or model needed; simple steps to take without cost; how successful inven- tors have secured financial assistance; show interesting inventions; illustrate important mechanical movements. With books we also send Free Evidence of Invention form to help establish date of disclosure. Prompt service, reasonable fees, special deferred payment plan. Strictest secrecy. Thirty-six years’ experience. Highest references. Write us today. The facts in our books are worth money to the man with a good 7 invention. Address: Victor J, Evana Data Service, 3002 Monroe, Kansas/ & Co., Registered Patent Attorneys, City. Missouri. 420-D "Victor Building, Washington, MOTORCYCLES D. €. ENGLISH Motorcycle Books. ‘“‘Work-| WORTH while inventions are short shop," “Hints, Tips for Motorcyclists,” “Speed—How Obtain It,” “How to Manage Motorcycles,” $1.25 each post- paid. Overhead speed heads for Fords. Send dime for sample copy Speedway Racing Magazine, catalog English rac- ing and stock motorcycles $150 up. Crash helmets, supplies. Clymer, 430 West Pico. Los Angeles, California. PARTS. Send 10c for 1935 Handbook of Information, listing new and used parts, accessories at cut prices, for In- dian, Harley, Henderson, Excelsior. Ind 622 E. Grand, Des Moines, owa. cuts to prosperity. Unpatented ideas can be sold. I tell you how and help you make the sale. Free particulars. Write W. T. Greene, 958 Darrister Building, Washington, D. C. PATENTS PATENTS. Booklet íree. Highest references. Best results. Reasonable fees. Watson E. Coleman, Victor Build- ing, Washington, D. C. INVENTIONS Wanted—Patented, un- patented. If you have an idea for sale, write Hartley’s, Inc., Box 928-J, Ban- gor, Maine. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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PATENTS—Before too heavy an FATENTS- Before too heavy an outlay | 500 LETTERHEADS, envelopes, state-| SELL Process Raised Pining $25: of time or money is made on an ínven- tion, a search of the Patent Office records should be made to determine as nearly as possible whether or not the same idea has been patented before. The cost of this search is small, while the value of the facts it uncovers is often considerable. We offer inventors and manufacturers a thorough, prompt, confidential search service—plus experienced counsel and assistance in every phase of Patent and Trademark practice. Write for my new free book containing valuable information relating to patent procedure. Clarence A. O'Brien, Registered Patent Attorney, 28-T Adams Bldg., Washington, D. C INVENTIONS Commercialized, Pat- ented or unpatented. Write Adam Fisher Company, 582 Enright, St. Louis. Mo. GET your own patents; legal blanks, complete instructions $1. Cudding Sons, Campbell, California. PERSONAL READ the backs of any standard play- ing cards. Secret Key Markings to do this, mailed for $1. W. Ray Davis, Box A, Mullan, Idaho. POPULARITY, success, can be yours. Personality improvement information free. Flow, 6618M. Quimby, Cleveland, Ohio. : FORTUNES await unlocated heirs! Authentic list, 25c. International Agency. M-4. Cincinnati. PHOTO DEVELOPING A-1 PHOTO Finishing Outfit complete, $2.50. Everything needed; easy instruc- | tions. Fascinating hobby. Save, make money. Burnam's, 4334 Melrose, Jack- sonville, Fla. FILMS developed 5c per roll; prints 3c each. Ask for Special Bargain List. Roanoke Photo Finishing Company, 159 Bell Avenue, Roanoke, Va. FILMS Developed any size 25c (coin), including two enlargements. Century Photo Service, Box 829, La Crosse, ur PHOTOGRAPHY MAKE MONEY. Sell your snapshots. “Hundred Best Markets For Your Photographs"—25c Haispence Ex- change M, 509 Fifth Ave., New York ity. SEND 25c for “Portfolio of Informa- tion for the Amateur Photographer”. Stamp brings particulars. Eastern Scientific Co., Box 294, Plainfield, N. J. 5x7 ENLARGEMENT 10c. Send emere Tiebout, 25 Claremont, New ork. PIANO TUNING PIANO Tuning learned at home quick- iy. Tremendous field! ave a year- around business of your own. Be inde- pendent! Information free. Write Empire School of Piano Tuning, 131 Rimbach St.. Hammond, Ind. POEMS—SONG WRITERS NEW DEAL. Write Sequoia Song- writers Service. Sherman Branch, Los Angeles, Calif. WANTED: Original Poems, Songs. MMM Publishers, Studio Bldg., Port- land Ore. PRINTING 500 LETTERHEADS, envelopes, bill- heads, statements, plugeers, blotters, etc. $1.75. Anything printed. Free Illustrations. Bredshaw, 3214 -Huron, Chicago. ENVELOPES, letterheads, statements, etc., neatly printed, $1.60; ras 00. Postpaid if cash with order. . M. Gray, Robbinsdale, Minn. 2000 BUSINESS Cards neatly printed $1.50. Charles, 12-AL, Norwood, Ohio. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 500 LETTERHEADS, envelopes, state- ments, billheads $1.75. Half cash. Cir- culars, cards, blotters. Free samples. Underwood Press, Garden City, Mich. PROPELLERS DIRECTDRIVE Propellers $3. Par- ticulars, sample propellers, 25c coin. M. E. Larson, Minot. N. Dak., Rt. 5. RADIO AND TELEGRAPHY ? Glos free. Dodge’ s Institute, King St, Val- paraiso. Ind. MILLION Point Supersensitive Radio Crystals, one thousand mile range. Set instructions included. Price 50c post- paid. Radio Supply Company, Edmon- ton, Alberta. NEW Long Distance Crystal Receiver. Blueprint, 17 others 25c Coin. lars Free. Modern Radiolabs, 151-K Liberty, San Francisco. REPAIR burnt-out Radio tubes. In- structions $1. Duck Mfg. Co., Free- port, Ill. RADIO SETS AND SUPPLIES RADIO Experimenters and Set Build- ers. Parts and Kits of Parts for Three, Four, and Five Tube AC-DC Sets, 5 Tube All-electric Auto Radio and Port- able Battery Receiver. Catalog. M-15, Lund Mfg. Co., Ave., Chicago. SHORT Wave Transmitters, Receiv- Supplies. WANTED! to $15.00. Calif. RADIOS FOR SALE FARM RADIO—Uses battery. Auto Radio—$?4,.55. . Catalog Free. 20th Century Co.. B-3142, K.C., Mo. RAZOR BLADES RAZOR Blades sharpened extra keen, lc each. Pete Wetterquist, Rockford, THinnis. one REAL ESTATE ROOTS AND HERBS AMERICA’ S BIGGEST VALUE! New Eo Almanac” sent for only Includes hundreds tested Beautifully EHE in natural colors. Needed every Bontanics, 145 West 112th St., 10c. Agency, M-4, incest. "NATURE'S Herbal Remedies" (118 pages; illustrated) 20c. Bluegrass Bu- reau, M-4. Newport, Ky. RUBBER STAMPS NAME and Address 25c. Ideal International Three lines tamp Works, Coeur d' SALESMEN WANTED MEN WANTED by shoe manufac- turer, established 31 years, to take orders for remarkable line of more than 200 styles of highest quality shoes for every purpose, including special bar- gains at $1.98 and $2.98. Good pay every day and your own shoes at factory No experience needed. Sales Write Mason Shoe Manu- facturing Co., Dept. H8, Chippewa Fails, Wis. l UN. Thousand, Cut Worth $6.00. i Noise like it! Com- mission $1.00. Experience unnecessary. Outfit furnished free. United En- gravers, L-8 South Dearborn, Chicago. SPECIAL representatives to wear and introduce Dobbs Pants. $1.95 up. Cash income, bonus, your pants without cost. No money or experience required. Everything furnished. Write. Dobbs Pants Co., Dept. C-5, Cincinnati, O SALESMAN-DISTRIBUTOR with car. Sell drug, hardware, garages, etc. New 10 cent item, Quick seller. Sure repeater. Ideal for truck jobbers. Peerless Waterproof Cement Co., 2741 Dodier, St. Louis, Mo. SHOP KINKS 1935 HANDY Man's Home Manual. Send 50c to Modern Mechanix and In- ventions, 529 S. Seventh St, Minne- apolis. Mion., Y TELESCOPES SPECIAL Powerful telescope, 50c, postpaid. Mars, 196 Broadway, New York. TELEVISOR BUILD Dollar Televisor. Instructions 23c coin and stamp. Arthur Pohl, 2134 Palms Ave., Detroit, Mich. TRAILERS “WANDERER” Cabin Trailer plans are in 1935 Handy Man's Home ual, 146 page book chégk full of auto, radio, workshop, home, and garden proj- ects and handikinks, sent postpaid for 50c. Modern Mechanix Publishing Co., 529 So. 7th St. Minneapolis, Minn. VENTRILOQUISTS LEARN Ventriloquism by mail; small cost, 3c stamp brings particulars. Geo. Smith, 125 North Jefferson, Room $-624, Peoria, Ill. WANTED TO BUY LOOK! $5.00 to $15.00 for old radios. Rush description for offer. Super Dual Radio Co., Sacramento, Calif. WANTED Charge Generator 10 or la Kilowatt, 110 or 220 volt D. Rebelein, Kiester, Minn. WELDING LOOK! Complete Electric Soldering Kit—only 98c! You get sturdy, prac- tical soldering iron complete with cord and plug, generous soldering dien and voluminous, illustrated pe ARC-WELDING Outfit $1.25. Weld fenders, braze, solder. Lavrow, 4368-W, Warren. Detroit. Stamp appreciated. WIND BATTERY CHARGER WIND Electric Charger. Build self from our kit of parts, or send large bluepitnts: Lorenzen Propeller Company, Niles, Michigan. MAKE wind battery charger for lights. Our- 1.00 Construction plans, 25c (coin), Robert McNeill, Jr., Hopkinton, Iowa. WIND Power Battery Charger. Plans 25c coin. General Battery Service, 76F Glenwood, Minneapolis, Minn. WIND ELECTRIC LIGHTS ELECTRIC Lights—Wind Driven. You build them. Simple direct drive. Auto- matic control. opyrighted blueprints. Write. Wind Motor Electric, Ridgway, Montana. a plants. Roblin’s- Propellers, Storm Lake, Iowa. 13 ©

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Bea Civil Engineer! Cyclopedia o£ ‘ Civil Engineering 7 great volumes, 2,800 pages. 1,600 illustrations. New Revised edition by twelve of America’s greatest engineers. Includes: Surveying, bridges, railroads, steel structures, mu- nicipal engineering, water supply, road building, etc. “*Civil engineers ere wanted NOW. Enormoa: amounte are being spent in ell kinds of public worka and not a dime js spent until the Engineer e must direct the imply written s0 an them. Start now on our FREE examination plan. Mall the coupon without obligation. Spanish Grain Flex- ible Covers Gold Stamped $$ | American Technical |! L dá Drexel af 58th St., Dept. C4320, Chicaga gems wer mer ummy NEN URS MENS UD NEN GUN. Uum gane I American Technical Society, Drexel at 58th St., Dept. C4320, Chicago Free! x=” e f I return them within 10 days. If I wish to I keep them I will send you $2 a'ter the 10 days, then $3 a month until speci») advertising price | $29.80is paid. Send latest Edition. within your reach, Sem no money—just mail the coupon. x |] Address 22. eee EDI ERI sees J (Attach letter stating age, occupa- » on, employer's name and address) AUTO TRAILERS FURNITURE BOATS RADIOS MODELS THE NEW 1935 HOW TO BUILD IT Tells You How 149 Different Complete Shop Plans FOR ONLY 50c lf your dealer is sold out send 50c to MODERN MECHANIX PUBLISHING CO. 599 S. Seventh St., Minneapolis, Minn. Building Stratosphere Air-Liners [Continued from page 34] in a concrete mold. The resulting stream- line fuselage has not been amenab!e to im- provement. 'The fuselages of the ships that are cutting airmail times in half today are built on forms of a principle laid out 16 years ago! Right back into the stratosphere again! We can build a ship for it now. We'll be flying it within a very few years; possibly months. And the speeds, the comforts, the unusual travel factors introduced by actual 400 mile an hour speed will put the strato- sphere transcontinental air-liner in a class where it will make today's airmail planes look just as sad as today's ships, today's comforts and progress make the old DH-4 Liberty air- mail planes look. Strato-Liners to Resemble Modern Transports The present twin-motored transports are 60 to 80 feet in span, and 40 to 50 feet long. For stratosphere flight a plane would have to be a real passenger carrier, and it would have seats above and below the mid wing. It would be double decked, so to speak. It would be more than 100 feet in span, and over 60 feet in length. Those are the major outward dif- ferences. Inside the ship is where most of the radical engineering departures will be seen. Why the changes? Take today's airplane up to 50,000—75,000 feet (supposing you could get it there) and what would happen? A number of ridiculous things. For one thing, the engine would slow down and die. If you happened to supercharge it So it could breathe sufficient air to burn a normal amount of gas, it would run away with the propeller and would wind up at a fearful rate, probably breaking a crankshaft and throwing connecting rods all over the coun- try-side. It would be a problem to keep the motor warm. Oils, to be effective, must run at 350- 450 degrees, and the cylinders themselves must be that warm to obtain thermal effi- “ciency from the gasoline heat energy which is doing the work. Ice on Wings Creates Problem The tires of an ordinary ship would prob- ably blow out. The people in the cabin would suffer the bends—a nausea and bleeding due to insufficient oxygen and deficient air pres- sure. And the ship itself would load up with a ton of ice in no time. What is more, the ordinary airplane of to- day could travel only in one direction. A 200 mile an hour airplane could make it overland at 400 miles an hour from California to New York. Then when it had performed the phe- nomenal feat of going from Los Angeles to [Continued on page 142] 140 Thank You for Mentioning Modern Mechanix and Inwentions for April When Writing to Advertisers

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New Scroll Saw Increased Efficiency —New Features Latest Delta Model—hailed everywhere by woodworkers as most efficient Scroll Saw avail- able, This new “Delta” Scroll Saw is another great step forward in scroll saw performance. Enables you to use fine blades at full motor speed without danger Dome of breakage. Has many other novel and useful improvements, This year the Delta line of motor- driven woodworking tools is more complete than ever before. Delta : standards of efficiency, quality, and convenience have been strictly main- tained—and Delta prices still kept at their low levels. Good compact motor-driven tools are within the reach of all. Every woodworker will find the new 1935 Delta line of un- usual interest. Send for 1935 Catalog of Delta Tools The 1935 catalog of Delta quality motor-driven tools is now off the press. It is crowded with photographs and information about the new line of 1935 Delta tools. It shows how Delta tools are built to stand the grind of production work, and yet are so low priced as to be within the reach of all. Send coupon so your name will be placed on the mailing list to receive the 1985 Delta catalog without delay. Enciose only 10c at same time for Book of Prac- MUR NUM GU NUT. UN UN UN RUN RUN NUN UN un RR A NR RN RM a] ] DELTA MANUFACTURING COMPANY f 3775 N. Hoiton St., Milwaukee, Wis. Dept. M435 | I enclose 10e (stamps or coin), for which please f tical Delta Projects, 32 pages of new and send me one copy of ipraencal Delte CL DERBI [| novel things to make with many blue p Pece me on your mailing list to receive 10 elta f prints, working drawings, photographs ] og of quality motor-driven woodworking tools. i and illustrations—and complete directions. [ Name... esses Age? uen [| Delta Manufactu ring Co. | diii e ies ritiene i | ity secet BtAte: — AIA [| f O Check here if you are a Delta user now. I 3775 N. Holton St., Dept. M435, Milwaukee, Wis LEARN W [am m A SS OD os ART LESSONS (ass Become Talented Artist with Big Income This thorough home-study Course teaches Com- PAID mercial Art, Cartooning, Lettering--anatomy, per- d. COURSE COMPLETE AT HOME You can learn by our modern and orig- inal system of instruction every part of the Watch Repairing Trade at home as good or better than at a shop. You can earn money while learning and se- cure a well paying position or start in business spective, adv. layout, short cuts, tricks of profession etc. Jexander Murray, famous Art Bchoolinstruc- tor. Natural ability not necessary. Over alb clear, after completing our course of instructlon. Good Concise tne traction plates ear oor included. FREE. watch repairers are always in demand and earn Compote Course (no more to pay) only $1.95 post very good salaries. For particulars apply to the ald--or send no money, pay postman plus postag: ey back if not delighted after inapecting. Turi MILWAUKEE SCHOOL OF WATCH REPAIRING ores not delighted a our spare time of to Into big money tomorrow. 524 E. MASON ST. Dept. C MILWAUKEE. WIS, EDU TIONAL SUPPLY CO. s Dept. 111-D RACINE, WIS. Modern circuits stumps the old-time cut-and-try radio fixer. More puzzling complications are coming. Service men with up-to-the-minute knowledge are urgently needed. Such men easily make up to $3 an hour. Ne Past Experience Needed Past experience counts for little at this time because changes in radio design are so swift and radical. That's why you, as an R. T. A. Certified Radio-Technician can step right into the big money at once. Write today for full particulars. RADIO TRAINING ASSOCIATION OF AMERICA Dept. MM-54, 4513 Ravenswood Avenue Chicago, lil. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers 141 EARNS $2.00 to $5.00 AN HOUR I started a radio shop handling all kinds Jf radios and electric equipment. Since I have been able to starting this shop, carn from $2 to $b an hour. Ihave built up a good reputation from sales and ser- vice work. These catisfied customers hav * referred their friends to me and asa result I have all the business I can handle. R.T.A. eure opened my eyes to big money and I want to thank you for all you have done for me. My income is more than double what it was at the time I enrolled and I expect tu earn still more. Ernest Lanetot, FREE! OF EXTRA COST To start you meking money without delay we equip you with this Cireuit Analyzer and Point - to - Polnt Tester. Reelstance

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RAFTIN FROM AN ENGINEER. GET READY FOR PROSPERITY. Be ready for Big Pay. I will train you at home by mail on Practical Drafting until in position, or prepare you for Better Pay on the Job you have. All high class tools with Drawing Table furnished by me if I train you NOW. NO EXTRA CHARGE. Write Sor my free book—My Pay-Raising Plan. FREE. Employment Service — Seen After training you I help you to get a job without charging extra for this service. E; | For MORE PAY kearn twback. perience is not necessary. You do not need to be a college or a high school graduate. Find out from me what a big oppor- tunity there is in practically all industries for Draftsmen. DRAFTSMEN NEEDED:-In: Aviation, automobiling, elec- tricity, machinery, building lines and many other industries are now calling for draftsmen. More new draftsmen will be needed right along in all these fast-growing industries, at higher wages than ever before. YOU should prepare NOW. If my training does not satisfy you atter Mon ey Bac k you finish—you get every penny back. “Success in Draftsmanship” It tells you how I help you find a real ma opportunity in anyone of many big | industries. NOW is the time to pre- pare for your better pay position, TODA Y —is the time to write for this free book! (School Est. since 1900.) ENGINEER DOBE, Div. 47.34 Libertyville, Ill. — Hd eme P e EE Meda HOW TO OBTAIN A PATENT, written by a Former Member of the Examining Corps (1922-24) of the U. S, Patent Office. If you want to profit by your idea, you should take steps to apply for a U. S. Patent at once, Your first step is to get this Free Book. This interesting illustrated book contains valuable information you should have. Jt tells you fully how to obtain a patent on your idea in the quickest way, With this Free Book you will also receive a “Record of Invention” form on which you can easily record your idea. Personal and Confidential Service: Your Case will be persenally han- dled only by a Registered Patent Attorney who is also a Former Member of the Exam- ining Corps of the U. S. Pntent Office. All communications will be strictly confidential. MAIL COUPON TODAY FOR FREE PATENT BOOK AND RECORD OF INVENTION FORM MILLER & MILLER REGISTERED PATENT ATTORNEYS FORMERLY IN EXAMINING CORPS U. S. PATENT OFFICE 1638 Woolworth Bldg., Dept. 45B, New York City | Miller Building, Dept. 45B, Washington, D. C. Please send me your Free Book, “How to Obtaln a Patent,” | and **Record of invention” form. ADDRESS ......eeeeeense annehmen ror 142 Large Royalties Offered Inventors [Continued from page 81] The trouble with the electric gasoline gauges of today is that they are not strictly accurate but depend somewhat on the incli- nation of the car. Nor are they accurate at the extréme ends of the scale. A remedy for ihese errors would be a money-maker. We have still to see the automobile with the safe adjustable steering wheel that can be arranged quickly to meet the demands of the driver whether he be tall or short. A little attachment for carburetors that would remove or prevent the flow of water would be a winner. Many an automobile is stalled by water (even a single drop) in the bottom of the carburetor. Such a device would be worth a great deal to the automobile in- dustry with a resultant value to the inventor. A thermostat that could be adjusted to function between certain definite limits by a small serew to replace the type that trips at a single temperature would be quite’valuable. A little thermostat that would automatically turn on a small electric heater under an auto- mobile engine when the temperature of the garage dropped to a certain critical point would be worth a great deal of money. It would prevent freezing and facilitate quick starting on cold days. i A little device that will drop glycerine on the windshield wiper during sleet storms will sell fast. This would drop glycerine under the windshield wiper where it would be worked over the surface of the glass to per- mit better vision. Building Stratosphere Air-Liners [Continued from page 140] New York in 6 hours, it could make the re- turn trip quicker by coming back to Los Angeles via London, Constantinople and the Hawaiian Islands! That is because a 200 mile an hour ship flying against a 200 mile an hour wind stays in the same spot. Temperatures are way down, about 50 de- grees below zero F.—this means we've got to build a flying ice box to keep the passengers warm. And we must keep the engines warm —normal operating conditions must be arti- ficially supplied. We'll have to design some- thing that will take the ice off wings as fast as it is formed. The sweating of windows, the forming of fog within the cabin, all will have to be accounted for by a separate de-icing, cabin warming, pressure furnishing plant that will run independently of the main motors. This pressure furnishing feature will prob- ably have to function in the manner of the air conditioner. It will not do to use air bottles, because they are too heavy. The cabin space Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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Building Stratosphere Air Lines must be a chamber which has intakes and ex- hausts for conditioned air. The link between the cabin and the outer air will be a condition- ing plant. Because of the low pressures, variable area as well as variable pitch propellers will have to be used. Such devices on the business end of an engine will be comparable to the gear shift on a car. Purely in the matter of borrowing from terrestrial aviation what appears to be good practice, I would use two motors in my strato- sphere plane design. They would be super- charged, air cooled, and of the in-line type. This type is slightly cheaper to manufacture, is more robust, and easier to service. The major qualifying point which is now bringing such motors back into their own is that they streamline into a wing so well. By putting the wing at the middle of the fuselage, making it a mid-wing ship, stream- lining the motors into the wing, and allowing a retractible landing gear which can be folded to the wings to lessen air resistance, we will arrive at the design of the ultimate airplane. Yes, that stratosphere ship will be unique— a flying wing that will whisk people about so rapidly they'll scarcely need to eat from coast to coast. We may have to educate a new breed of passenger, but the knowledge, materials and men to build and fly the stratosphere air-liner are here—right now! How I Judge Championship Fights [Continued from page 121] addition of two judges was a forward step. Permitting a referee to be the sole judge of the fight would be like putting all your eggs in one basket and would accomplish no les- sening of squawks on decisions. The argument was advanced that the referee is always sufficiently capable of handling the situation, and that too often the judges are incompetent. Granting that the referee may be sufficiently competent, I do not adhere to this theory. I admit that now and then there is an in- competent judge, but this is one of the fal- lacies of boxing, and to improve the game there must be precaution in the selection of officials. There is only one solution to the numerous decision controversies occurring in various parts of the country. That is the Illinois scor- ing system, which will become universal when other boxing bodies realize its fairness and effectiveness. Add to this the careful selection of officials and a campaign of boxing education to the fans and we will have a better sport. Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers BIG MONEY CO FISHING-CAMPING HUNTING: SAILING MEAD Sportsman's KI-YAK is the most structural fea- tures set & new standard for lightness, Strength, à south market CHICAGO Get Your RADIO BUILDERS’ MANUAL Now. Price 50c at all newsstands. New spice Portable only1O£a day! sk 10-DAY FREE TRIAL OFFER Only 10c a day buys this lat- est model machine. Not a used or rebuilt typewriter. „é Not an incomplete machine. (f A beautiful brand new regu- lation Remington Portable, Standard 4-row keyboard; standard width carriage; margin release on keyboard; back spacer; automatic ribbon reverse; every essential feature found in "standard typewrit- ers. Carrying, case and typing course free. Absolutely the biggest typewriter value ever offered! "Try it in your home or office 10 days free. If you do not agree that it is the finest portable at any price, return it at our expense, Don’t delay. We pay cost of shipment direct from the factory to you. You save on the purchase price and you do not risk one penny. Write today! FREE HOME TYPING COURSE Write Remington Rand Inc., Dept. 141-4, Buffalo, N.Y. 143

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Kile trical Hect rical Engineering One of America's most distinguished, most thorough — institutions. Founded 1903. Unique experimental laboratories. Faculty of Specialists. Widely endorsed by Electrical Industry. COMMERCIAL ELECTRICAL ENGINEERING IN ! YEAR. Fascinating, prosperous new branch of the great electrical pro- fession. For non high school graduates, intensive {6 months course. RADIO-TELEVISiON—Talking Mories—Sound Amplification, ri thorough approved course leading to Government ‘Transmission Licenses. AIR CONDITIONING and ELECTRICAL REFRIGERATION offer unusual opportunities for the properly tralned man. AVIATION, expanding rapidly. ELECTRIC ARC WELDING, a new profession in need of properly trained men, is thoroughly taught, covering all phases under actual working conditions. Each semester a complete Unit of Training. ' You advance ac- cording to your ability, EARN’ LIVING EXPENSES. part of their living expenses, SCHOLARSHIP LOAN FUND for those who need help. Daily Radio Broadcasting over WISN. Athletics. Delightful environ- ment. Successful graduates in all parts of the world. CATALOG FREE. Write today for bulletin, state age, education .and course interested in. B. 8. Degree Many students carn the larger We AAILWALUIEE.— of ACHAL o ENGINEERING MM 335A—Broadway and E. State Milwaukee, Wis. INVENTORS SEE PAGE 12 PUTT TTT ETT REESE No JOKE To BE DEAF ~Every deaf person knows that- Mr. Were made posti hear hi8 watch tick after eing deaf for twenty-five years, withhis Arti- cial Ear Drums. He wore them day end night. They stopped his head noises, They are invisible andcomífortable,no wires TRUE STORY j - p» bookleton Deafness, Artificial Ear Drum MPANY 741 Hofmann Bite. WAY CO Detroit, Michigan How to make 33 electrical devices ONLY ONE DIME! Secret locks © Electro magnets Telegraph sets è Buzzers Complete scientifically correct instruc- tions for making 33 interesting electrical devices that willreally work. Aleo simple, illustrated description of principles of m electricity and dry batteries. Fu hi à 96 pages — illustrated WITH DAY GATITRIES Any map or boy who likes to make thinge needs this book. Write for your copy today. Send 10 cents (coin or stamps) to Dept. MN354, Room 1328, National Car- bon Company, Inc., 30 East 42nd St., New York, N. Y; Racing Time For News Scoops [Continued from page 45] in each country. Each bureau has a staff of editors, rewrite men and reporters. In addi- tion “string” correspondents in towns and vil- lages in the bureau’s territory send news on a “free lance” basis to the bureau. Anyone can sell worth-while stories to press associa- tions, if he has the story first. If the news is purely regional, the bureau rewrites the story and sends it by telegraph, telephone, or automatic printer only to the client news- papers in its territory. New York Controls Press Network If the story is of international importance, it is cabled to all key bureaus which in turn relay it to all client papers in their countries. In the United States the United Press operates a network of telephone wires leased from the American Telephone and Telegraph company. These wires reach every section of the country and enter every newspaper office served by U. P. Each bureau in the country has sending machines and operators who punch stories on the tape of automatic printer machines. The same machine also receives; similar machines are located in every client newspaper’s office. From the time service starts until it ends these machines are always going, neatly type- writing the news of the day on a continuous roll of paper. The New York bureau con- trols the wire. If it has the best story of the moment, it takes the wire and its operator runs his tape through the machine until the story is completed. As stories break in vari- ous bureaus they send schedules of the stories to the New York office. The New York chief editor selects the best ones and tells each bureau when it can send a story. * Hot" Story is a Bulletin If a bureau has a “hot” news story, it waits until the story on the wire reaches the end of a “take,” which is seldom 23 lines long, then the operator in that bureau breaks into the line with a “bulletin” bell signal and sends one or two paragraphs of the story. In the client newspaper office copy editors continually tear printed copy from the ma- chine, select the news wanted, edit it to the desired length, write headlines for it, find a place for it in the “dummy” of the day’s paper, send it to the composing room where it is set up, put in the forms and finally sent to the press. The bureau that has a “flash” story breaks into the wire immediately, stopping any story that may be moving on the wire. The bureau sends the “flash,” then holds the wire for the subflash which follows immediately. [Continued on page 148] 144 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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,Diesel Engineer Diesel engines — because of their high E efficiency, dependability and economy fiw SUN that wlll require more and more Dlesel-tr: BUILD AN AUTO RADIO Send 50c for blueprints to Modern Mechanix Publishing Co. 529 S. Seventh St., Minneapolis, Minn. 3 e FRA CTOR FACTORY PRICE forward and reverse Here s an amazing money maker for farms, truck á Runs 4 to B gardens, orchards, nurseries, poultry rünches, à country homes, etc. Plowe, aisca, herrows, culti- vates, mows lawna, cuts tall weeds. Runs belt machinery. Doea work of many men. 1to5 & H. P. riding or walking types. Write nearest office for FREE CATALOG, Low Factory Prices T! A REAL POCKET RADIO Can actually be carried in pocket or purse! No Ja tubes—batteries—nothing to wear out. NO crystals Pato adjust. Simply clip to any metal object as desks, beds, telephones, ete. One control—gets all E stations 50 to 100 miles; Short wave & police calls atsol No complicated hookups or wires needed! a Verified 1800 mile reception! Foolproof—and pra = tical—great novelty, Can be used ANYWHIE —ANYTIME—In Auto, ete. Complete with tiny phone, NOTHING else to buy, Ready to listen! Send only $1.00 end pay postman $1.95 plas post - ageor send $2.99 (M. O., Currency, Check). Ideal gift. Guaranteed, Order now! (Fcreign orders büc extra), TINYTONE RADIO Co. Dent. Kearney, Nebr. RAISE RABBITS FOR US WE PAY YOU UP TO 35.00 EACH. ALSO PUT YOU IN TOUCH WITH MARKETS EVERYWHERE. Large illustrated book and catalog, also copy of the AMERICAN RABBIT FARMER and monthly market bulletin show- . ing names of buyers in various parts of Ameri- 9‘ c2 who continuously buy all rabbits offered them. All for 10 cents. Address OUTDOOR ENTERPRISE CO., 113 Maln Street, NEW CITY. N. Y. Handy PICK-UP T00L—51. omplete Ine, , included. 14 1-2! flexible body reaches in- f &ccessible places. Picke up email parts, Placeascrews,nuts, cotter Lj Ss ^ ing, when opening ig too smal) or hand. Four steel fingers grip either pin or large object secore- ER i ly. Garages, workshops, machine shops, experimenters, use one or more, Saves time, patience. Pin dollar bill to letter or eend check. No C.O.D, ordcra. Agenta wanted to detail mechanica, Bred pU IN IAND TOOL CO., W. 603 Second Spokane, Washington Werer PINLESS CURTAIN ‘ae STRETCHER! PAYS AGENTS UP TO $10 IN A DAY Saves time—eliminates ironing. Stretches curtains up to 48 inches wlde—eny length—in a jlity. No ns to cause Injury and tear costly curtains—no frames. Jusi two iri ee " le cadmium SAMPLE OFFER! lasts a Low-priced. EVANS MFG. CO., Dept. 6680, Cinsinnatl, © Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers Diesel Engineering offers you a chance to get Into a field that ison the upgrade and continually expanding — one a ned men for the next 25 years, or as long as you need to work. A very important part of our service ia that, when the student has completed his training, we help him search out an opening In the Diesel Engineering field where he can be sure of stead reward for his foresightedness in getting training. Write today for free Bulletin. No obligation. American School, Department D428, Drexel Avenue at 58th Street, Chicago of operation—are fast replacing steam and gasoline engines in power plants, motor trucks and busses, locomotives and ships, tractors, dredges, drills, pumps, etc.—opening up steady, well- paid jobs for Diesel-traired men. You ean get the necessary training at home on all the latest Diesel developments— two- and four-stroke cycles; solid- and air-injection fuel systems; low- and high-speed and heavy duty types: Diesel-electric generating sys- tems, etc. Course includes all text materlal— with special diagrams making possible quick understanding of this new type of power. advancement, with an ever-increasing -- BRANCH --- ANUFACTURERS On small or large scale for our NEW LINE of Cast Metal 5 and 10e Novelties, Toy Automobiles, Ashtrays and other all year sellers. No special place or-experi- ence necessary as we furnish full instruetions with moulds and cooperate in selling, also buy finished goods. Chance of a lifetime for man with small capital to get into this new and profitable industry. If you mean strictly business and are over 21, write AT ONCE for details as we are now closing arrangements for 1935 usiness. METAL CAST PRODUCTS CO. 1696 Boston Road Dept. 2 New York, N. Y. m START $1260 to $2100 YEAR MEN—WOMEN—I8 to 50 ~--—- inn STEADY WORK ,T FRANKLIN INSTITUTE . Dept. N310 Many Spring Examinations — Rochester, N. Y. Expected Po Gei Rush x entlemen: us o me, CORE SUNT ^^ FREE of charge, list of U. S. Government big pay jobs. Send me FREE 32-page book describ- ing salaries, vacations, hours, work and send pointers telling how to get one of these jobs. " d Mail Coupon s? Today— E 7 SURE ; hy ———————— £ — IAddr6ss siena niae n aW ACA EUN CS EV vica 145

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e Popularity! Step right into it with a P-A Sax’, Play beautiful tunes first week. No failures. Learn quickly. Join a dance band in 90 days. Only P-A assures such rapid progress. Easiest blowing, fingering; most beautiful tone. See your P-A Dealer, or write direct for beautiful literature. No obligation. Easy terms. You can do it. Write today. 1166 PAN-AMERICAN 430 P-A Bldg. , Elkhart, Indiana "Grow PU giant mushrooms in cellar, attic, barn. New, easy, odor- less method. We show you how, fur- nish guaranteed materials and buy crops. Valuable big book and pictures free if you write quickly. (Est. 1908.) UNITED MUSHROOM CO. 3848 Lincoln Ave., Dep. MM-4 Chicago s DoN'T COPY - LEARN TO $85 RAYE BURNS will teach you HOW to CREATE ORIGINAL CARTOONS at home 4 that Mat yoa ean can, BELL! Course has 26 lessons and Send name and address for ro 00, Ua pcd Onlyscee RAVE BURNS SCHOOL. Dent, F-X. Box 2194. CLEVELAND, OHIO EXPERIMENTERS Electric Fun! Make things spin, jump, shoot, shock, flash, mystify with 110 volts A.C. Book of 200 stunts . Spectroscóné: "Powerful laborator trument, new invention, identifies aH metals under 50-watt excita- tion and shows the countless lines of the solar CUTTING & SONS 45 D St. Campbell, Calif. PENNIES WANTED Lincoln and Indian Head. We Buy e pay “R to $20.00 per coin. Other coins up to ER 00. Send 10c for buying list and prices. PUBLIX COIN CO. AT-7343 Cottage Grove. Chicago. INVENTIONS WANTED! Patented or Unpatented This amazing new Book, Inventors’ Sell- ing Gulde, tells how to make money with patented or unpatented ideas. In- cludes names and addresses of nearly 1000 manufacturers actively in the market for ideas. Tells how inventors may protect their ideas for small sums, where and how to turn inventions into cash, etc. Book covers Proved Methods of Selling, Finding Buyers, Royalty Contracts, Legal Pitfalls, Financing, Gyp Schemes to Avoid, Patent Office Methods, and many other vital topics. A complete encyclopedia for the inventor, written by Raymond Francis Yates, who has helped over 30,000 in- ventors, 226 pages, fabric binding—mailed postpaid for only $2. (Or, C. .12.) Money-back guarantee. FREE LIST OF NEEDED INVENTIONS offering big opportunities to inventors, and full details of book mailed on reauest. ‘Three other big books for inventors: Protecting and Selling Unpatented Inventlone—Edlson’s Secrets of How to invent—(60 Million- Dollar Ideas for Inventors. 50 Cents each, or all three for $1. DONLEY PUBL. CO., 509 Fifth Ave., Dept. M4, New York, N. Y. 146 Clipping Dollars From Auto Costs [Continued from page 123] thousand miles, the ignition has sparked 8,500,000 times; the valves have lifted 17,000,000 times; the pistons have traveled 2,100 miles, and the carburetor has rapidly split four hunared pounds of gasoline into 8,500,000 accurately measured jets of gaso- line, expanding each drop by adding from 12 to 15 times as much air, All this calls for inspection and adjustment at intervals. The lesson regarding speed holds true for oil also. One engineer says that the average ear driven continuously at 60 miles per hour uses 10 times as much oil as it does at 30 miles. Compression Ratio Increased The idea that heavy oil will last longer is not necessarily true. “Most of us have an exaggerated idea of the difference in con- sumption between, let us say, an SAE 30 and an SAE 50," says one leading engineer. “The difference is usually very slight. When an engine is designed to use light oil, its oil consumption will not be reduced noticeably by using very heavy oil.” As motor manufacturers have improved their cars to give more speed, acceleration, and power, they have been steadily raising the compression ratio—the amount the gasoline vapor that is squeezed in the cylinder before it is fired. The bigger the ratio, the more power generated. But too much compression makes motor knock. For this reason, ethyl gasoline was introduced. Tetra-ethyl lead, chemists found, has the strange property of stopping knocks simply by checking combustion, slowing down the explosions and making the gasoline exert a push, instead of striking hammer-like blows. Cool Motor Saves Gasoline The octane number indieates how strong in anti-knock a fuel is. High-compression motors require an anti- knock gasoline. The higher the ratio, the higher the octane number that should be used, Learn your car's compression ratio, for it will tell you whether your car needs ethyl gasoline, or can use the cheaper grades just as well. One leading refining company rec- ommends its standard grade for cars whose compression ratio is 5% to 1, or less, and its ethyl gasoline for cars with a ratio of more than 515 to 1. Third-grade gasoline is suita- ble only for cars with low compression ratios. The hotter an engine is, the higher the octane number it will need o prevent knock- ing. A motor which doe: not knock at 100 degrees with 65 octane number, will knock at 200 degrees on any fuel less than 85 octane number. Keep your motor running cool and save gasoline. 'This means correct .timing, clean spark plugs, clean valves. Thank You for Mentioning Modern Mechaniz and Inventions for April When Writing to Advertisers

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PERFECTED lewly. perfecte È. Jennie Vice $ inven-' ion enabies any- one to re-stri: E rackets nt big sav- inge or for Bi! OFITS, Just follow sim- ple DRE UM ve on your own tennis e..earn money tool Write for Free detail: zi gUY factory Hresh Strings. e we Now you cen buy genuin- GUT airings direct, EIU eea ^. yeu; oi h Ex oF, cost atrings, ee, Suns, quip- ment d Catalae will SAVE YOU MONEY WRITE Ro EAR u RREN tennis vise invention! H-E: WILES CO [e Vee Waukee Pen. 2354 Kaen TM ud FREE CATALOG Ready March 8 Fully illustrated, showing footwear, clothing and other specialties for Fisher- man and Camper. L. L. BEAN, Inc. 32 Main St. Freeport FREE—BLUEPRINT BOOKLET Select your blueprint plans now for that boat, auto camp- ing trailer, lake cottage, radio, or piece of furniture you're planning to build this spring. Send a stamped, addressed envelope to Modern Mechanix Publishing Co., 529 S. 7th St., Minneapolis, Minnesota, to get your copy of the big 1935 MM BLUEPRINT BOOKLET. CHEAP OIL BURNER Invented COOKS A MEAL FOR ic Slips Into Any Old Stove, Range or Furnace; Beats Coal or Wood; No Dirt or Ashes; HALF THE COST. United Factories, D-600 Exchange Bldg., Kansas City, Mo., heve brought out an amazing oil burner which experts and 15,000 users say boats any ever gotten out. Burns cheap oll a new way, Without generating or clogging up; glves intense heat at HALF COST by turn of valve. One free to one person in each locality who will demonstrate and act as agent. Write quick, be first te learn how to end drudgery of coal and wood and make big money, spare or full time—mail le postcard today. Learn for only—$ Writefor free book, easy payment plan, on America’s best home-study courses that prepare fastest-growing industry Publice Address, Photo El a, tronics, Electricel- Engineering! Most complete, understandable. leborsiery apparatus. We help you earn as yon learn, Send for fall Bi MONEY ^» RADIO, ELECTRICITY you pig, in spare time for biz-pay je In LINCOLN ENGINEERING SCHOOL Maine 955-1 8. 37th BTREET, * LINCOLN, NEBRASKA a World-Wide AII-Wave Receiver with the Sensational New EXPLORER “A M 0” CONVERTER The 1935 EXPLORER makea ANY radio n powerful, complete sll-wave receiver, equal to expensive all-wave sets, Full LOUD-SPEAKER reception of forelgn short wave stations: air craft. amateors, police calls, ete, Exclusive nee "AMO! circuit gives tremendous reserve power] Complete range of 15 to 200 metere in four banda. Precision aata dial, eutomatio band selector, heterodyne station Indicator, Headphone Outlet, other exclusive features. Simple, permanent ineiallation. Can be used alone as short wave receiver. Only $16.95. Money back guarantee. Coupon or postcard brings FREE LITERATURE. -- — — ee ee ee -— ee - umo IM RADIO MFG. CO., 695 Grand St., Dept. M-4, Brooklyn, N. Y. Su at once full information regarding the new EXPLORER. Name. — —— ————— — Address City — — À———————————— — ——————— State Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers FOR A PERMANENT PROFITABLE BUSINESS pree OF YOUR OWN MAKE $30 TO $40 A WEEK Our free plans show you how to build a successful business of your own sharpening lawnmowers. No experience necessary. Most men averago from $30 to $40 a week. J. B. Van Dien, Ridgewood, N. J., writes: ''Some weeks I earned $40 a week with my Ideal just as a side line." H. Greenlau, Fond du Lac, Wis., writes: “In May I sharp- ened over 200 mowers at $1.00 each." Niles C. Race, Rochester, N. Y. writes: “I have sharpened 785 mowers at $1.00 each.” THE IDEAL LAWN MOWER SHARPENER Makes old, dull lawnmowers eut like new. Mowers run easier, stay sharp longer—cus- tomers come back year after year. Start right at home. Attach the Ideal to your lamp socket. Sharpens any make of mower in 15 to 2 minutes—you get $1.00 to $1.50. At- tachments for grinding skates, grass shears, hedge shears, sickles, scythes, axes, ete. Send Post Card for FREE CATALOG and complete plans THEFATE-ROOT-HEATH CO- 335 Bell St. Plymouth, Qhio WHY? HOW? N EON SIGNS Big Opportunity in the Neon wa" and whys in this complete practical ores uds" p "hue hovered gb large size pages, over 150 illustrations. Covers all branches; p lowIng—Tranzformerg & Circuits Vacuum Pumps—Service Worh— THING! Never before sbtatnebl le at eny price—now yours et a e pis E OP. low. Generous-paying on business needs more traine: men right aver Learn it In fale com jeter Gon technical course—ONLY £u 63, postpaid to your door! Don $ jose out by waiting. ail check, express or postal hanea a Now! Do COMMERCIALITE LABORATORIES, P. 0. Bax TaT, Omaha, Nebr. We THEAT R E MOR- E DROY DIRECTOR CEN ERA. * ED Get the facts about this new Technical Course of training in the mechanical and business side of the Theatre. All subjects except acting. De- signed to prepare students for positions in any branch of commercial theatre operation. Write General Manager about this new, interesting and well paid profession. Address Dept. M. [AE ET OEE PASADENA omun PLAWHOUSE «s 39°S* EL MOLINO AE: PASADENA: CALIE 147

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; From a Thousand Fathoms Déep The Secret Knowledge of a Lost Race Choked into stillness by the'fising waters were the | words of wisdom of a vast forgotten people. Majestic structures once stood where now is naught but thé ocean's roar. By what mysterious means did the sut- vivors reach Egypt's shore? What magnificent wisdom did they bring as their heritage? ` "Before death sealed their lips they imparfed To sé- eret Brotherhoods their knowledge. The Pyramid. stands as silent testimony to their greatness. There began the schools of secret wisdom; the traditions of ; this knowledge have come down the ages as a guide. for those who seek happiness and mastery of life. For. centuries the Rosicrucians have searched out and per- petuated this store of fascinating truths." "This Sealed Book Loaned to You: ~ If you are willing to study and apply unusual know! edge, a Sealed Book will be loaned you without cos revealing how you may acquire these secret teachs ings. Write to Scribe A. T. K, Help Kidneys Don’t Take Drastic Drugs Your Kidneys contain 9 million tiny tubes or fllters which may be endungered by neglect or drastic, irritating drugs. Be careful. If Functional Kidney or Bladder disorders make you suffer from Getting Up Nights, Nervousness, Loss of Pep, Leg Pains, Rheumatic Pains, Dizziness, Circles Under Eyes, Neuralgia, Acidity, Burning, Smart- ing or Itching, you don't need to take chances. All druggists now have the most modern advanced treatment for these troubles—a Doc- tor’s prescription called Cystex (Siss-Tex). Works fast—safe and sure. In 48 hours it must bring new vitality and is guaranteed to make you feel 10 years younger in one week or money back on relurn of empty package. Cystex cosis only 3e a dose at drugglsts and the guarantee protects you. Are you adult, alert, ambitious, willing to study? Investigate LAW! We guide you step by step— furnish all texts, including 14-volume Law Libra- ty. Training prepared by leading law professors and given by members of bar. Degree of LL. B. conferred. Low cost, easy terms, Send NOW for Free ,64-page “Law Training for Leadership.” LaSalle Extension University. Dept. 4493-L, Chicago Racing Time For News Scoops [Continued from page 144] News is the most perishable commodity in the world. In a few hours it is “stale.” World- wide news agencies constantly battle time to be the first to get the news to the news- papers. A "scoop" on a big story sells news- papers and the press association that gets the most scoops will get contracts over rival as- sociations with newspaper clients. Where a newspaper must make, at the most, a half dozen deadlines per day, the press as- sociation is up against a deadline somewhere nearly every minute of the day. Serving newspapers in every time-zone of the globe, its dispatches are always going to press. Prepare in Advance for Scoop At 6 P. M. in New York, New York after- noon papers have finished their day, but afternoon editions are just beginning to roll from the presses in San Francisco, morning editions are being made up in London, while in Tokyo evening paper staffs are preparing for another day. Competition to beat the ever-present dead- line is keen. Scoring a beat over his rival is to a correspondent what winning a knockout decision is to a pugilist. And similarly, a beat is more often the reward of painstaking prepa- ration than a “lucky break.” Months in advance the United Press began preparing for the possible death of Reichpresi- dent Paul von Hindenburg. This foresight won a clean scoop on the story. Scoring Beat on Hindenburg Death Long before Hindenburg died, the Berlin office had laid down in London, New York, Buenos Aires and other points a complete background of obituary material, speculation on Hindenburg’s successor and the political consequences of his death. During the three days before his death, the United Press lined up twelve sources for protection on the flash, Special arrangements were made to move urgent cables even faster than usual. At 5:44 on the morning of his death came the final bulletin saying the President was in a deep coma. The United Press staff was mobilized in the office; correspondents waited at Neudeck, the President’s home. The Berlin office radio was turned on, but silent. Suddenly the announcer said, “We will transfer to the Propaganda Ministry.” That was,at 9:45. The bureau manager just got the telegraph office on the phone when his assistant, listening to the radio, cried out, “Hindenburg’s dead.” The bureau manager dictated the flashes for New York and Buenos Aires; they moved immediately. A later checkup showed that the one to New [Continued on page 150] 148 Thank You for Mentioning Modern Mechaniz end Inventions for April When Writing to Advertisers

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DIVORCE EYE CRUTCHES! QU P Get RID of the Spectacle A R= Handicap. The NATURAL Nf EYESIGHT SYSTEM makes Victory over Glasses Possible. You are the Judge—your eyes the Jury—when the Natural Eyesight System goes on trial in your home for four months on our 100% MONEY-BACK GUARANTEE. U — Full Information Mailed FREE | Natural Eyesight Institute Inc. 3 Dept. 54-E, Los Angeles, Callf. 00D post Less Cutters, “The id (c.0.D. t. SHAPER pal d dde U. $, $3.25) "Uses standard 5/16” cutters. Table is heavy gauge pressed steel, 8”x5%4”; stands 5%” high. Base, table support and spindle adjusting slide, heavy gray iron castings. Ollless bearings. Order now or send 3e stamp for Catalog fully describing all our equally low priced power tools and accessories, includi Jig 8 Line Shaft, Laikos, olon eto. ^ nent DTM Press, Sander, J. & H. METAL PRODUCTS CO. 480 5i Paul SL, Rochester, N. Y. ARE YOU A MODEL RAILROADER ? If you are, you need my 76 page hand book and catalog. It gives complete informatlon on getting started, track laying, signalling, control, ete, Also prices all parts, track, signals, control units, ete. A veritable cyclopedia of dala; conversion tables, screw sizes, charts, ote., ete. Price only 25¢ postpaid. W. K. WALTHERS 1576 W. Pierce Street Milwaukee, Wis. E A PASSENGER TRAFFIC INSPECTOR A Good Position WIII Be Ready for You UPON COMPLETION of our ehort, home-study gare, ses lace you as ^ Foire ai Dus enger 'napeetor , atu ermon plus expenses, Start, or refund tuition. | Advance- ment is rapid with experienced men earning more. Active men—19 to 60—eligible. Healthful, faecinat« ing work. Free Booklet describes our i6-yr, ex- nerience. STANDARD BUSINESS TRAINING IN- STITUTE, Div. 6104, Buffalo, N. Y. wc MONEVZCAMERA agazines, newepapers, advertisere BUY 7,000,000 photos a | frs year from people who know to take the kind of pictures apare time, how to take realhuman-interest pic- FREE tures that SELLI Our marketing service helps Fen to quick, nation-wide sales. SEND FOR BOOK REE 800K that tells how to earn while youlearn. UNIVERSAL PHOTOGRAPHERS 34, 10 33 Street, New York City "ELECTRICAL EXPERIMENTAL $2 79 LABORATORY KIT—Only. > mammaa, Amazing Bargain! Complete home electrical laboratory experimental kit. guaranteed orizinal cost of parts, $17.75—formerly told Tor $3.99—NO W ONLY $2.79! Contalns hand-driven 110 volt AC generator—polarized test xinger—ultre violet and arc furnace carbons—microphone transformer—con- densers—test receiver—Skinderviken element—electro-plating bath—electro magnets—magnet and hook-up wire—mechenice assorted nuts and bolts— giant magnets, ete, Illustrated experimental manual furnished, K motors, relays, detectophones, extension telephones, electro plating, etc. Weight 18 Ibs. All high grade electrical apparatus—not toys—assembled from benkrupt ana surplus stocks of leading manufacturers, Order direct irom ad. Send only $2.70. Stamp for catalog. ELECTRICAL SALVAGE COMPANY, Box 524-2, E wanted! Let us teach you, at low coat, in your 0) a $17.75 Lincoln, Nebr. RADIO ENGINEERING RCA Institutes offers an intensive course of high standard embracing all phases of Radio. Practical training with modern equipment at New York and Chicago schools. Also specialized courses and Home Á Study Courses under ‘‘No obligation” plan. 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Send coupon for a eet for ation and see for yourself. 10 Big Books Shipped FREE "Raion" — ee e e ce a MÀ NU M — UR ee — American Technical Society, Drexel at 58th St, Dept. E-4320, Chicago Send for 10 days’ free use, BRAND NEW 16 volume set of Electrical Engineering. In return for mailing thia coupon promptly, send free, certificate of membership În the American Technical Society entitling me to full consulting privilege: for Ru MP eb NOTA UE AP KI Byes and o' T n * after 10 daye, then $3.00 & month until the special price of only $29.80 is paid. 149

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Sam lity Stein tlonal, self-suds- sin Expensive Ras Ont! Completo with $ fae Tostare Ajo cleans TNO- As In Expensive Racquets p 1 String, tools and directions Jeum, woodwork and wlndows Easy to restring racquets—better than new. Saves real money. Send without work! Auto owners for this professional outfit todey. Good profits made restringing other and housewlves wild about players’ racquets. 37 ft. string, colors, Purple, Green, Red or White— this strange chemical sponge! also Scarlet and Black Spiral with contrasting silk trim, awis, Illustrated SAMPLE OFFERI Samples sent at No "MAE. "send check’ or^ Money Order $1.65 which pur risk to first person p each local- | risk. FREE OUTFIT. MONEY includ: P * 3 y who writes. o . rite ay fora e! . * BOOD, ir deemed Be creme Sent fitst—send your name today! PRO TENNIS STRING Co. Deni. We HARMON, N. Y. KRISTEE MFG. CO., 2434 Bar Street, Akron, Ohio Thank You for Mentioning Modern Mechaniz aud Inventions for April When Writing to Advertisers 151 aS AGENTS! MAKE BiG: MONEY New, an. Simp! Show and take orders. No experience needed.

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ea ir, out of a real quirrelll Also make spare time! Free book tells haw. E Write TODA BOOK! 7: hal beauti: Ad free book telling how to learn Ses 3 B boy, Book Je free. TROPHIES ontaing many fine pictures. ATH YOUR : AGE. Dept. 4734 Omaha, Nebr- N. W. SCHOOL AVIATION!! APPRENTICESHIPS AIR-MINDED Young Men interested in entering the field of Aviation as Apprentices. Write im- mediately, enclosing stamp, to-- MECHANIX UNIVERSAL AVIATION SERVICE 13291 Ardmore Dept. A Detroit, Mich. Raise mushrooms in your basement, Az 1 z St cellar, garage, idle places. Large com- panies require tons of mushrooms daily for Mushroom Soup. Become an M.G.A. Grower and cash in on thiz big demand. Exnerience un- necessary. We buy crop, FREE BOOK. MUSHROOM GROWERS OF AMERICA D3-433 N. Clark St. Chicago, lineis The 1935 Edition of the HANDY MAN’S HOME MANUAL! Buy Now How To Fix « « © « o Leaky Faucets, Balky Furnaces, Broken Win- dows, Ailing Radios, and 1000 other items for the Home At All Newsstands How To Build... - Furniture - Toys - Games - Ice- less Refrigerators . . Swimming Pools and Automobile Trailers If your dealer cannot supply you write to MODERN MECHAN!X PUBLISHING COMPANY | 529 So. 7th Street Minneapolis, Minn. Get It Now! Contest Winners Get $125 [Continued from page 55] magazine racks easily reached by swinging out the hinged side panels. Paying one dollars for the seat and eighty cents for necessary unholstery cloth, the total cost for materials comes to approximately six dollars. This figure includes all the plywood, fiber panels, wood, glue and nails needed. By using lumber and materials already at hand, you should be able to reducé costs con- siderably. Make the wood frame first, carefully align- ing all pieces before gluing or nailing. Build up the side frames by sawing out the curves on a band saw, gluing together, then sanding to a smooth finish. Diagonal braces in the base will give additional strength to your chair. Hardwood, if available, is to be pre- ferred for all frame pieces. Magazine Rack Panels Are Pressed Wood Cut out the outer panels for the magazine racks from 14” fiber or pressed wood material, after first transferring the design to your work. Simply draw 2” squares on the fiber, then make the curves by following the squared pattern given. A rather novel method of hinging each magazine rack panel, known as a trunnion hinge, is used here. Stop blocks at each side of the outward swinging rack catch on similar blocks nailed to the inside of the arms and limit outward travel of the racks. Do not be confused by the dotted lines in the end view of the rack—they represent the front stop blocks, which are lower than the back ones because of the slope of the chair arms. Avoid Wrinkles When Tacking Upholstery New covering is applied to the auto seat and to the chair arms. Pad the tops of the arms either with cotton or horsehair, then pull the cloth smoothly over and tack underneath. It is a good idea to use the old covering of the seat here to hold the padding in place. When using heavy cloth, cut triangular notches out of the edges at sharp curves, to avoid bumps at the tacking edge. Do not tack heavily the first time, as you may want to return to smooth out wrinkles. The legs may be taken from an auto seat or cut from wood, as you prefer. After all up- holstery has been completed, set in the seat, and fasten to the wood frame with wood screws. To prevent the back of the seat from swinging forward too easily, clinch the hinges a bit with hammer and punch. Leather tabs tacked to the tops of the magazine racks will make opening easy. The weight of the magazines themselves will keep the racks in closed position. 152 Thank You for Mentioning Modern Mechanix and Inventions for April When Writing to Advertisers

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AND THEY ARE | GUARANTEED FOR A WHOLE YEAR! ATLAS SAVED US 50% ON OUR TIRES P US. oris; ATLAS SUPER VALUES motorists who demand highest quality at lowest cost. Actual tests on roughest roads prove that standard brand tires recon- à structed by the scientific Atlas process deliver 50 to 60% more A service. Order today, save money. Orders filled promptly. BALLOON TIRES REGULAR HEAVY DUTY JS Rim, | sr Tubos " CORD TIRES TRUCK TIRES Xx4.40-: . - Tub 29x4.50-20 2.38 0.89 | 30x3....., $2.25 $0.00 ^ sma PUCK BALLOON hog 30x4.50-21 2.40 0.85 | 30x334 -38 0.75 | 6.00-20....$3-75 $1.65 28x4.75-19 2.45 0.95 0.85 | 6.50-20...: 445 1.95 9x4.75-20 2.50 0.95 0.85 | 7.00-20.... 5-98 2.95 29x5.00-19 2.85 1.05 0.85 | 7.50-20.... 6.98 3.75 0x5.00-20 2.85 1.05 115|8:25.90.... 8.98 4.95 28x5.2b5-18 2.90 1.15 1.15 | 8:27-92.... $9.9 4.45 X5.25- T E . z 31x5.25-21 3.25 1.15 diag | a a — 64b ...5.50-17 3.35 1.15 HIGH PRESSURE ux PSOE Seek Int X5.50- ; à X5...... . E ...6.00M6 3.75 1.45 Well-Known 33x5.:..:. 3.785 145 3d 6:0017 3-49 118 Brands at Lowest 3210 pedes 2-95 2.75 x6.00- E ij i x6...... x 31x6.00-19 3:49 L15||' M95 in History Ip) 535-755 10.85 3.95 32x6.00-20 3.45 1.25 All tubes new guaran- BxT..... 10.98 3.95 33x6.00-21 3.65 1.25 teed. Circularmolded; of 36x8...... 12.45 425 32x6.50-20 3.75 1.36 || finestheavy guageheat- $ | 40x8. ..... 19.98 4.95 ed Orders Filled Promptly || 8 f V/ WE RECEIVE HUNDREDS SAVE MONEY —ORDER TODAY! OF LETTERS LIKE THESE: | ATLAS TIRE & RUBBER CO., Dept. 4723 ] *“ Please send me two more tires, The [ 6250-52 South Morgan Street le ones I got are very satisfactory.” Gentlemen : Please ship the following to N. R. Brocioua, Í ] Pennsylvania Name. “Two years ago I bought two 28 x 4.75 i ] tires from you and was pleased with dd: P 3 them. Kindly let me know at once if | Addren ] ed you have any 30x 3% in stock. Aleo [| n I E: vour price.”’ G. R. Nyquist oe M GERUNT SD Rockford, Hl; I SIZE SIZE PRICE : QUAN. | TIRES TUBES BACH TOTAL 1 > Send $1.00 Deposit with each tire 9 ordered ($4.00 deposit on each truck L—— ul e — us ———] j 5 tire), Balance C. O. D. If you send 77 cash in full deduct 5%. Year's service [—— ———J|——1——— ————] ; 2 guaranteed, or replacement at % ps price. Order today. Las —— — eee Se P | ATLAS TIRE & RUBBER CO.., Dept. 4723, 6250 S. Morgan St., Chicago | Thank You for Mention'ng Modern Mechanix aud Inventions for April When Writing to Advertisers 153

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BUSINESS Converts New ldeas Into PROFITS A soft water unit, containing a special granular material, re- moves all hardness, including lime end magnesia, from water. It rests on any ledge and attaches to faucet with a rubber hose. A new plastic material with a rubber-like con- Sistency may be moulded into any shape, and resists the action of chemicals injurious to rub- ber. It has greater flexing power than rubber, and will be used when resistance to strong oils and chemicals is desired. A six inch bristle brush for varnishing is now available, Attached to a long handle, it may be operated like a push-broom from a standing position to varnish floors in a short time with little hard labor. Bakelite tablets bearing the manufacturer’s name are imbedded into the center of a cake of soap by Hungarian soap-makers to tell the user where to replenish his supply when the cake is used up. Ant bait, a sweet, slow action poison for the extermination of ants, is delivered in an air tight con- tainer and feeds poison syrup through a wick set near the bottom. À home repair pamphlet issued by an iron cement manufacturer con- tains numerous hints for iron re- pair work around the home and on the automobile. A unique water heating unit is contained in a water-proof case, and may be slipped into a hot water bag to maintain any temperature desired, by thermostatic control. 154 A new hack saw frame may be vertically or hori- zontally extended on arms so that the distance between the top of the frame and the saw-blade may be adjusted to fit the work. A blue-print paper, recently developed, is said to provide a clear blue background without a blending of background into the white line even when over-exposed. A radio transmitter, designed for ship and airport work, has a "frequency shift" that allows the operator to select any one of ten frequencies merely by turning a selective dial which works exactly like the conventional telephone dial. A die-making machine, recently perfected, is said to have simple adjustments that facilitate quick changes and speed production almost one- third. The machine is powered with a one-fourth horsepower motor, takes any size saw, and uses either standard or special saws. Electric plants, streamlined and run by gasoline motors are obtainable in six sizes to produce from 350 to 3,000 watts of flickerless alternating current. It is claimed that they will run any elec- trical appliance that would be used on a city line carrying wattage up to the capacity of the machine se- lected. A new belt sander and grinder is de- signed for use on a bench, and de- velops belt speeds of up to 4,000 feet per minute to grind wood, metal, stone or composition materials. Set into a hollow handle, a self- draining shaving brush pivots into an inverted Position when not in use, thereby permitting the bristles to drain. A perforated cover pro- vides sanitary protection. A new fishing reel, said to eliminate nasty tangles when the line runs out after the bait has stopped, features a governor control which brakes the reel spool as soon as the bait hits the water. There are no visible adjustments to regulate this feature; the action is entirely automatic. The reel also has a level winding attachment to minimize snarled knotty backlashes. Editor’s Note — Addresses of manufacturers of these and other new products in this issue can be obtained by sending a stamped, self-addressed envelope to MopERN MECHANIX AND INVENTIONS. Manufacturers are invited to submit photos and literature for this page.

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uble Page Spreads

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NTERESTING INVENTIONS An Early Revolver This early Colt re- volver was patented in 1836. Samuel Colt, its or- iginator, was known as the boy inventor, While still a lad he ran away to sea and whittled the first model of a repeating fire-arm out of wood during his leisure moments on ship- board. Colt is à good example of the inventor who was persevering. Three years later, in 1839, he had made improvements to produce the second revolver shown here. lt was used in the Mexican War with excellent effect. By 1852, Colt had the largest fire- arms factory in the world. Colt died à very wealthy man. This is an early Gillette Safety Razor and the beginning of one of our greatest modern commercial enterprises. Mil- lions of safety razors have since been sold all over ihe world and millions of dollars of profit have been made. For centuries men shaved with the old straight edge razor. Then came Gillette with his happy idea. Many Littie Ideas Have Big Commercial Possibilities Look around in any direction today and see the inventor's handiwork. Many of the most successful inventions have been the small things found in ten- cent stores, drug stores, hardware stores and the like. Many inventions have come from men who did not consider themselves inventors at all. If you have an idea which in your judgment will make money, save money, save time, save labor or give pleasure— then see about protecting your rights to it. It costs you nothing to learn the facts. The Patent Laws were made to protect the poor man and the rich man alike. But you must know how to take advantage of them. ec ECEIVED your book, ‘Patent Protection'," writes an inventor, "and I am only sorry that I did not have the information contained therein some thirty years ago. | have been unfortunate enough through my ignorance to lose out in at least three major instances where understanding would have helped immeasur- ably." Another inventor says: ‘In going through your book, one of your mechanical movements gaye me an idea that I am sure I will be able to use in my invention." We cite these statements from inventors simply to emphasize one point: Ignorance is dangerous, where Patent matters are concerned. The ea. profits, is to do nothing simply because he know WHAT TO DO. That is why inventors by the hundred have wel comed the book shown on the opposite page. It tells them WHAT TO DO. Its facts are valuable, often vital. They may be the means of saving money, saving time, and most important, saving later disappointment. Can You Answer These Questions? How the Patent Laws protect an inventor? What is the first simple step to take to establish a claim to an invention? What kind of a sketch or drawing is needed? When is a model needed? What can an inventor do to secure financial assistance? Why a Patent is necessary? What can be Patented? What a competent Patent Attorney can do for you? What will it cost? What is the preliminary search and why it is important? These and other questions are answered in our 48-page book of facts, “Patent Protection." In it, we have tried to put the practical, usable information "which from thirty-six years' experience we know the average man requires. Among other things it shows interesting inventions, 115 mechanical move- ments, views of the U. S. Patent Office, and much more. It is yours for the asking. We gladly send it with our compliments to serious, Interested men. HOW WE HELP INVENTORS For thirty-six years—more than a third of a cen- tury—it has been our business to help inventors; to assist them in securing ALL THE PROTECTION TO WHICH THEY ARE ENTITLED, We have represented not a few inventors, or a few hundred, but THOUSANDS of them in their dealings with the U. S. Patent Office. We answer questions—thousands of them a year. We study each device to bring out its best Patentable possibilities; we often dissuade inventors who might have gone ahead with inventions which could not possibly have been protected. By methods of effi- ciency, carefully developed over a long period, we endeavor to keep expense at a minimum. We arrange deferred payments where they are needed. 12 Thank You for Ment'on?ng Modern Mechanix and Inventions for April When Writing to Advertisers This is a 1$ NEW- Book About Selling Inventions There are two sides to every inventive suc- cess: There is the inventive side, which deals with the invention itself. There is the com- mercial side, which is the way the inventor sets about getting his invention on the mar- ket. A good invention, poorly handled, can prove a failure commercially. An ordinary in- vention, properly handled, can be made a money-maker. In a NEW special booklet, just published, we give you some suggestions on "When and How to Sell an Invention". We £lve you practical hints and advice on the commercial side ‘of inventing. Write us a card, letter, or use the handy coupon. Look before you leap. THE FACTS. They cost you nothing. They can be worth much. STRICTEST SECRECY With these two booklets we will also send you a FREE copy of our "Evidence of Invention’ form, on which you can sketch and describe your invention and establish a date of disclosure. Such a dated disclo- suro may later prove important to you. We send full instructions for its use. Any letters, sketches, draw- ings or models you send us are held in STRICTEST 1 SECRECY. You can write us frankly. But your first step is lo get the facts. Sign and send the coupon now, Get that much done today. Thank You for Mention'ng Modern Mechanix and Inventions for April When Writing to Advertisers 13

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Random Chips kom the Editors Workbench Midget car fans, boat builders, and radio hams, here's good news for you. And if you are planning an auto trailer, get in- side information here on a movie stat’s trailer that you can build from MM. Three types of midget cars built by MM readers. Jere McWethy, 12 years old, of Aurora, Ill., built the car at top. Jack Pinnick, 16, made a chassis of bed rails for the car at left. Ken Leiser of Madison, Wis., uses the car at right for advertis- ing at his filling station. Jere and Jack have Briggs and Stratton motors. Ken has a one lung motorcycle engine. HEN we published that excellent story in the March MM, "Television Will Carry the Mails" we overlooked granting Alfred Albelli his just credit for obtaining that instructive and revealing article from David Sarnoff, President of the Radio Cor- poration of America. 'To be fair to both Mr. Sarnoff and Mr. Albelli, our New York cor- respondent, the by-line on the story should have read "By David Sarnoff, President of R. C. A., as told to Alfred Albelli." * * * Spring may stir some persons to poetry, but it brings the home worshop fan out of hiber- nation. Judging from the letters we have been re- ceiving, he wants to build midget cars, auto- mobile trailers, portable radios, and boats. This issue has them all except the trailer— and we'll tell you about that later. We're not trying to sell you this issue be- cause if you've got this far you've already bought it. But you had better get your order J. E. Bowers took third prize with these photos of his bunga- low trailer. At left trailer is ready to be occupied. Frame work without canvas roof is shown at right. "Trailer folds up. 20 in now for the May MM. It will contain one of the most unusual automobile trailers you have ever seen and it comes to us right from Hollywood. We'll keep you guessing what movie star's trailer it is until next month. * * * Before you build another radio set get a copy of MM’s newest book, “Radio Builders’ Manual" There is nothing like it on the market. It has everything —short wave sets, converters, adapters, auto radios, all-wave receivers, trans- mitters, and erystal sets. It’s written so that anyone can build a set that will work and get distant stations. "Radio Builders' Manual” will be on the news- stands in a few days. If you want to get your order in early, send 50 cents to MODERN MECHANIX AND IN- VENTIONS, 529 S. Seventh St., Minneapolis. * * * Let's get around to our prizes and letters before they get squeezed out. First prize of $5.00 for the best picture of the month goes to Harry Sapp, the first reader to send us photos of the “knee action” midget car in the Sep- tember, 1934, issue of MM. He tells us: This 15-foot boat, his first wood working project, won second prize for O. H. Ryerson, Columbus, O. Mt. Holly N. J. Dear Editor: Enclosed find photos of a power push- mobile that I have built and tested. The motor was formerly a two cylinder motor, but one of the walls became cracked so I converted it into a one lung affair. The car was built from your September issue. Wagon wheels were used with 114” by 3" stock. The free action in the front really helps because it keeps the frame from twist- ing. It worked the first time I took it out and attained a speed of approximately 25 m.p.h. Several boys in town are building the midget and we might lay out a track and race them. Harry Sapp. Twenty -five miles an hour on half an engine? Wonder what kind of speed- ometer Harry used? Well, he gets the five dol- lars anyhow. * * * The man who tackles a fifteen- foot boat as his first woodwork- ing project ought to get a prize. That's why we sent a check for $3.00 as second prize to the writer of the following letter: Jack Miner, owner of a famous game farm, caught lake trout by taking Robert Page Lincoln's tips. Construction of this "knee-action" midget car was described in the September MM. Harry Sapp built it, sent in the photos and won first prize of $5.00 in this month's contest. Columbus, O. Dear Editor: Enclosed herewith is a snapshot of a Doane Hydrobout, 1514’x5’2”, powered with a Star motor. The speed is approximately 27 miles per hour. The framework is constructed entirely of inch wbite oak. By following Doane's con- [Continued on page 22] “REAL SHAVING COMFORT NEVER COST ME SO LITTLE!” @ “I never dreamed a low-priced blade could shave a tough beard like mine until I tried Probak Jr.” writes T. C. Schreiber, E: “Now I get clean, easy shaves with never a bit of irrita- tion and I’m saving money on razor blades.” Get the benefit of unequalled manufacturing at lowest possible cost. Try Probak Jr. Probak Junlor Is a methods—automatic tempering, grinding, hon- Product of Gillette ing and stropping. Enjoy real shaving comfort 9nd fts all Gillette and Probak razors, Thank You for Mentioning Modern Mechanix and Inventions for Aprit When Writing to Advertisers 21

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Above—Allan Lockheed, designer of ` Lindbergh's "Tingmissartoq," of the monoplane with which Amelia Ear- hart conquered the Pacific, of Wiley Posts "Winnie Mae," and other famous planes, is also the author of this comprehensive article on build- ing stratosphere air-liners. Right— The Lockheed “Scout,” designed 16 years ago, compares favorably with planes of later development—testi- mony to the fact that the future in aviation can be predicted today with reasonable accuracy. The stream- lined principles of the "Scout" will be further developed in strato-planes. ALLAN LOCKHEED Supplies the nation’s premier flyers—Lindbergh, Earhart, Hawks, Post, Wilkins—with Lockheed planes for their record feats. This pioneer of early aviation, now active on design work for air transports of the immediate future, contributed many of the ships that today are burning up com- mercial airline schedules and cutting air mail time in half. Consequently the words of Allan Lockheed, today one of the outstanding individ- ual technicians of aviation, are of more than usual significance when he deals with the prob- lems of flying airplanes in the stratosphere. His story follows: HY fly in the stratosphere? Simply because there’s a free 200 mile an hour boost up there that aeronautical en- gineers want to take advantage of. If one could plan a railway that would run down hill all the way from coast to coast, think of the transcontinental speeds he could attain. Flying in the stratosphere is not as simple as building a downhill railway, but it is a sub- ject which has intrigued airplane designers for a long time. Much data has been accu- mulated about it. Many rumors have seeped through the daily press about the wonderful 32 oted Plane Designe O O-D O e O g doub (d d p peed oug qd O O O O O trans-oceanic speeds we are going to get. All that is in the offing. Right this minute, however, enough mate- rial has been accumulated through pioneer experiments and flights to turn the minds of those of us who are engaged in the business of developing airplanes toward the possibility of building a stratosphere plane today. Under existing conditions, with existing materials, we plan to double our present speed by the simple expedient of welding this 200 mile an hour stratosphere boost to our cause. Up in the stratosphere—that layer of air between 50,000 and 75,000 feet altitude—there are steady winds that blow from West to East, opposite the direction of the earth's rotation. By these winds alone we can gain a measurea- ble increase in our overland speed. But there is another factor. As we ascend, the density of the air becomes less and less. This even- tually diminishes to a point where we have gained the effect of reducing our fuselage and wing drag; which is the same as saying we have reduced our wing surface to the mini- Modern Mechanix and ` wings, the retractable landing Above—A double-decked pas- senger plane following Lock- heed’s design for stratosphere airliners. Note the “in-line” type motors faired into the gears, and the wings set in the middle of ship. Right—At work on the Jimmy Martin strato-plane at Bucks, England. The plane may be completely taken apart for shipping. The motor was built at a cost of $200,000, and attains a speed of about 400 miles per hour, mum. At the same time, through supercharg- ing or forcing air into the carburetor to increase performance, we have maintained our motor power output. The result is natu- rally a big jump in speed. The only justification for stratosphere flight is velocity. If two points are so close to- gether that an airplane could reach one point from another in less time than it would take to climb into the stratosphere, go the distance and descend, there will be no need for strato- sphere lines. But the coast-to-coast route is a logical objective! Volume of traffic in pay- ing quantities and the great time to be saved create a demand for such service. Since the eastern trip will take about 6 hours under top conditions, probably the air- line men will loaf from Los Angeles to New York, taking 8 hours. Then by speeding the ship up against headwinds, they can maintain the same schedule going west to the coast. Inventions, April, 1935 Here it will be a matter of psychology in bal- ancing public feeling so that the traffic will be as heavy one way as the other. But I'm getting a bit ahead of myself. I talk just as though the stratosphere airliner were an accomplished fact. 'To me it is— I've carried all the probabilities around in my mind's eye until I can recite them backwards. Cleopatra could have had an automobile, you know. At that time all the materials existed which were necessary for the construction of the car. We can have a stratosphere plane if we want it; and we know how to build it and what it will look like. TIl tell you what the plane will look like, and why it will be constructed the way it will. Confidence in this prediction is based on the fact that my early ideas have stood the test of time. Some of the designs I did ten and twelve years ago, radical at the time, can 33

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American RAILROADS This giant oil-burning locomotive has made Northwestern railroad's new train, The 400, the fastest in the country. large, heavily-weighted drive wheels. The 400 hit a top speed of 91 m.p.h. Note the on the Chicago-Minneapolis run. Boiler pressure was increased on locomotive and oil fuel used to eliminate coaling stops. HREATENED by the increasing competi- tion of air lines and busses, the nation's railroads are whittling time schedules, smash- ing speed records to maintain their position at the top of transportation systems. First established train to set up a new mark was The 400, fastest scheduled train on the American continent. Curiously, The 400 is not streamlined, lightweight, or Diesel- electric, but a conventional, oil-burning iron horse. Pride of the Chicago & Northwestern railroad, it speeds over the 410 miles of re- ballasted roadbed between Chicago and St. Paul with standard coaches in 420 minutes, one hour, twelve minutes faster than old schedules. Its average speed of 58.8 miles an hour is faster than Twentieth Century’s 54.1 m.p.h. or the Burlington’s Diesel-electric Zephyr’s This latest streamlined train will run in New England. The Flying Yankee did better than 100 m.p.h. on a test run. 38 49.5 m.p.h. The new, oil-burning locomotive of The 400.features larger drive wheels, 79 inches in diameter compared to 75 inches on similar Northwestern locomotives. As a re- sult The 400 makes the run between Chicago and the Twin Cities with 5,557 less revolu- tions of its drive wheels. That run between Chicago and St. Paul and Minneapolis is the scene of a speed duel be- tween three railroads, the Northwestern, the Chicago, Burlington & Quincy R. R., and the Chicago, Milwaukee, St. Paul & Pacific R. R. First to meet the challenge of The 400 was the Burlington with two streamline trains similar to the Zephyr, which is now employed on a scheduled run between Kansas City and Omaha. These new, 3-car Diesel-electric units will clip at least 30 minutes off the seven and a half-hour schedule of The 400, accord- ing to plans. The Milwaukee will also speed up its schedule with two new streamlined oil-burn- ing engines pulling streamlined coaches. They are expected to have a top speed of approxi- mately 100 miles an.hour. Throughout the country similar speed races are in the offing. Union Pacific has inaugu- rated a 3% hour schedule over the 187 miles between Kansas City, Mo., and Salina, Kan., with its three-car streamlined M-10000. The time reduced old schedules by one-third. Santa Fe must meet this increased speed on the 67 miles from Topeka to Kansas City, which M-10000 makes in 72 minutes, Santa Modern Mechanix and . on its first trip and made 81 miles in 67 minutes — Challenge SPEED Records s Zephyr can reach a top speed of 120 m. p.h. similar streamlined trains are expected to reduce The 400s time on the Minneapolis-Chicago run. Fe, it is said, plans to reduce this time by two minutes. This western speed battle probably will extend to the Pacific coast this summer when the Union Pacific puts longer streamline trains in operation. The U. P. hopes to cut the present 5412-hour schedule between Chicago and the coast to about 35144 hours. Winton Engine Corp, a division of General Motors, is building a new double unit Diesel locomotive for Santa Fe. The new locomotive can be driven from either end, will be powered with four 900-horsepower engines, and will have a top speed of more than 100 m.p.h. With the new locomotive Santa Fe's crack train, the Chief, is expected to make the 2,364 miles between Chicago and Los Angeles in 40 hours, instead of the present 55 hours. In the East new streamlined electric engines of the Pennsylvania Railroad are cutting schedules between New York and Washing- ton. Competing with the Pennsylvania, the Reading railroad has built a coal-burning, partly streamlined, steam locomotive that clipped off 90 miles in 88 minutes. A new, streamlined, all-steel passenger train has been built for the Boston & Maine and Maine Central railroad. It attained a speed of more than 100 m.p.h. on a test run between Trenton, N. J., and Philadelphia, Pa. "Inventions, April, 1935 by JAMES DYSON This Union Pacific streamlined train broke the trans-conti- nental record. U. P. now plans to increase its new trains to 11 cars pulled by two Diesel engines of 1,200 and 900 h. p. respectively. The record breaking train above has three cars. This coach will be used on the Milwaukee's new streamlined trains between Chicago and Minneapolis. New oil- burning streamlined engines will have a top speed of 100 m.p. h. "Badger tail" car above will be used on rear of new train. 39

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Reader buys the "extra" from newsboy without realizing how fast news is gathered. 42 ROBERT L. FREY Executive Assistant United, Press Associations EWS travels fast. It circles the globe like lightning while historic events are still in the making. The world was reading the tragic details of the Morro Castle disaster while her pas- sengers were still leaping from the burning decks of the doomed Ward Liner into the storm-swept waters of the Atlantic. Less than 20 minutes after first radio oper- ator Rogers sent his SOS from the Morro Castle, the tragic story was flashed over Linotype Spera (right) hur- ly type: -set the edited news in jet which is fitted into page forms for the presses (center). apers them slide into news etek (left) dy for delivery. Modern Mechanix and sending news over wires. rrow shows sending tape. Man at long table in center is filing editor who decides which stories shall move first. In background center are copy editors. At right at typewriter is rewrite man. Inventions, April, 1935 ad E Flash / NEW YORK--RCA PICKS UP SOS FROM PASSENGER LINER MORRO CASTLE STi E: UPA NX RM442A worro CA " ASSENGER eCEIVE? E -- Wu N So ene? BULLET! P A aShED Y s OAS! 9 yY y NEU a RSE OF FIRE R RnaL5A At 4:23 a. m. Morro Castle radio operator sent SOS. While passengers were leaping into sea (arrows in top photo), . P. 142 a. m. sent flash, then bulletin, then "add" (on opposite page) exactly as reproduced here for extra papers. United Press leased wires into newspaper offices from coast to coast. Cables carried it to Europe, South America and the Orient. Rogers' signal was sent at 4:23 a. m. Picked up by the marine radio division of the Radio Corporation of America, it was relayed by telephone to the United Press. Amid the rattling battery of automatic telegraph printers in the New York office, the night editor took the message. He jumped from the telephone, shouted “Flash.” Instantly a deathly silence swept the room. Loudly but clearly he shouted the sentence to the waiting telegraph printer operators that would mean extra editions and streamer headlines to newspapers throughout the world: FLASH NEW YORK — RCA PICKS UP SOS FROM PASSENGER LINER MORRO CASTLE UPA NX RM442A The message completed, each operator rang 43

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Bureaus FLASH Photos the bell on his machine ten times. On every receiving machine in newspapers throughout the land a similar bell rang ten times. Again Silence while the night editor hurriedly wrote the three line bulletin subflash of the first story of the disaster. While he was still writing his assistant had grabbed hat and coat and quickly left for Asbury Park, N. J., where the flaming vessel had been sighted eight miles off shore. Be- tween snatches of the story relayed by tele- phone from R. C. A., the editor put through hurried phone calls, aroused United Press editors, reporters, and correspondents and ordered them to stations along the New the story possible. Reporters phoned New York from a dozen points—calling in disconnected details of the tragedy, stories from the survivors, condition of rescued passengers and crew, rescues by the Coast Guard and Jersey fishermen. 'Re- porters went to sea, flew in planes, inter- viewed every one who had the slightest in- Reporters writing running story of Bruno Hauptmann (arrow above) murder trial give, “takes” to messenger boys who rush to telegraph operators (below) in another room. They send it in Morse code to New York for the press association wires. Jersey coast to pick up every smattering of ~ Across U. S. by Wire formation about the tragedy, patiently listed every rescue and death to bring to the world the tragic story of fire at sea. The hastily assembled editors in the New York office of the United Press in turn gathered the disconnected ma- terial by telephone and telegraph and rewrote it into the coherent stories you read in your daily newspapers. That first flash of the disaster broke into the routine news that was being sent over the United Press wires. The operator in- stantly broke the smooth flow of the 60- words-a-minute sending tape, used for ordi- nary news, switched to the direct keyboard, and punched out the flash as fast as the editor dictated it. From that time on the story of the Morro Castle disaster, fed to the operators in short "takes," took precedence over all other news. When Cornwallis surrendered at York- town, ending the Revolutionary War, it took 49 days for that news to reach England. To- day such news would "flash" over United Press wires reaching 1,252 newspapers in nearly every nation of the world within 10 minutes. Scanning headlines over their morning coffee, few newspaper readers are aware of the vast newsgathering network of telegraph wires and cables, the thousands of correspon- dents, laboring 'round the world and 'round the clock to bring today's news to them today. Bruno Hauptmann testifies in the Lind- bergh kidnap-mur- der trial, a few min- utes later millions of newspaper readers know his answer to LIGHT BEAM SRECTED EOT REA SANNER. To get photos in newspapers simultaneously with press asso- ciation stories, Associated Press has developed Wirephoto service to send pictures by wire. Photocell scans photo, sends impulses over wire to similar receiving machine which has light-valve that acts on sensitive negative, After being devel- oped, print is made and half-tone cut prepared for newspaper. death. The first flier to cross the Atlantic alone lands in Paris; within five minutes the news is in American newspaper offices and newsboys are crying "Extra!" 20 minutes later. A press association is a world-wide news gathering agency. It supplies your local paper with all the important news that "breaks" outside of your city. The press as- sociation serves hundreds of newspapers in many countries of the world, each paper pay- ing a fixed fee for the service, ‘The press association maintains key bu- reaus in important cities and capitals of the world which in turn control smaller bureaus [Continued on page 144] co o5 $ 5 NEWS PHOTOS . i. ~FLASHEDIO,OO MILES Above automatic telegraph typewriter both sends and receives. As sending machine it punches out tape which passes through trans- mitter to send electric impulses over wires. every question. A noted European statesman dies; with- EUN. w MINUTES dm in ten minutes the a | cm d UNITED PRESS ASSOCIATIONS, NEU YORK. ROW) PES geedid WASHINGTON this. country and a few minutes later extras are on the street telling of his Each vertical line of dots in sending tape below is a character, space or punctuation . mark. Sent through machine, receiving news- paper would see typed words shown above. Sos ANGELES H [7T VefATLANTA = e DALLAS The wire route of AP's new Wirephoto service. Fifty newspapers in 24 cities get photographs by wire. While press association | sends story of disaster, Wirephoto at same time can send actual photos. Receiving and sending machines are located in each city. MIAMI Service is controlled in same manner as a press association. e UNI9*ED © 44 Modern Mechanix and Inventions, April, 1935 ) i ; 45

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NE minute to go! Fighting men ripping and tearing at each other.... A figure in white moves nimbly around them.... The glare of floodlights. . . . A sea of faces in the darkness beyond.... Then— The bell... . As one, the great crowd is on its feet. ... There is a tense pause. . .. In the center of the ring, an arm is lifted in victory. . . . A chorus of hoots greets the decision.... The resentment grows.... There is pandemonium. How many times a year do we witness this scene in the oldest and certainly the most glamorous of all sports? Too often, maybe, for the good of the game. In many places where boxing is legal, decisions that bring hoots of derision from the fans are doing in- caleulable injury to a fine sport. What is wrong? Is it the system of select- ing the winner? Is it the practice of naming CHAMPIONSHIP FIGHTS GEN. J. V. CLINNIN FORMER PRESIDENT NATIONAL BOXING ASSOCIATION Above—Gen. J. V. Clin- nin, former president of the National Boxing As- sociation, and author of this article on judging fights by point system. Below—A score of a mythical match between Joe Blow and John Doe. In the first round, Doe is penalized two points as he is knocked down. In the second, he loses a point for using a rabbit punch. He gains a point in the third for aggres- siveness and one in the fourth when Blow uses abusive language to the officiating referee. Above—Billy Petrolle ducks under a fast left-hook delivered by Sammy Fuller. To many in the back of the audience, this may look like a clean blow, but to the referee and judges, it is obvious that it glanced ineffectively off the back of Petrolle's head. Above—Baer steps inside of a right-hook to land a hard straight left to Carnera's chest. The blow 48 was cleanly made, delivered with the fist closed, the knuckles for- ward—the type of punch that is a point winner both with the judges and to the most critical audience, Left—Carnera struggles to rise, as the referee advises Baer to get into a neutral corner while the champion: is still down. Using the Illinois system of scoring, Baer would score points for the knockdown, but he might lose them if he con- tinued to disregard the referee's repeated warnings to get into a neutral corner. Failure to do this is con- sidered as a breach of sportsmanship as it does not afford opponent a fair chance to regain his feet. Modern Mechanix and inexperienced judges? Is it the referee? Is it because the fans are prejudiced? Let's see what is wrong and find out if there is a remedy. There are two major boxing centers, New York and Chicago. In New York, until recently, the system of scoring fights was solely by rounds. For some years, Chicago has employed what is the nearest approach to a perfect scoring system and New York is now experi- menting with a similar plan. B In Chicago, the scoring system is one that came into vogue while I was chairman of the Illinois Boxing Com- mission. It was invented by Dave Barry, the referee, and William Battye, one of our most competent judges. I shall explain it briefly: Each of the two judges and the referee is given a card on which are five columns for each boxer. The rounds represent units of ten points each; that is, five points, for each contestant in case of an even round. The columns and their classifications follow: 1. Aggressiveness, clean effective blows; 2. Deportment and sportsmanship; 3. Knockdowns; 4. Penalties—For fouls and foul tactics; [Continued on page 120] Inventions, April, 1935 x STAT Et e c COMMISSI dn Fitting Out SCORE CARD nons INSTRU Pole tN, rit toit)

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Nestling on sagebrush plateau high above swift-flowing Columbia river is Mason City—a town without a chimney—world’s first all-electric city! Homes of U. S. engineers can be seen on near side of river. Grand Coulee Dam is being built at this point. RESTO! This was the exclamation of wonder when, not a generation ago, elec- trie lights flashed on as tiny buttons were pushed. The invention of the electric washer, the electric range, the electric refrigerator, and the electric heater in turn brought forth this same exclamation. But that an entire city should "Push the " button” for all these purposes—that a town which is the home of nearly five thousand people should be built without a chimney is “presto” indeed; particularly when the city has been built within two months on a high sagebrush plateau in one of the wildest and least populated districts of the far west. Such a miracle has happened. Mason City, constructed for the families, employees and officials of the contracting firm which is build- ing the mammoth Grand Coulee Dam on the Columbia River, 92 miles west of Spokane in central Washington, is an all-electric city— the first in the world. The inhabitants of Mason City will con- struct the world’s greatest dam—almost four times as long as Boulder-Dam, and with twice the power capacity of the gigantic Muscle Shoals project. In the development, the larg- est conveyor system..in. the world will carry spoil dirt from electric shovels even bigger than those used on the Panama Canal; the largest trailer in the world, pulled by giant trucks and caterpillar tractors, is now hauling in heavy machinery and electrical equipment. Twenty-ton transformers are hauled to electric city on world’s largest trailer. Two tractors hooked on to rear are necessary despite powerful air brakes on towing truck and trailer. to make descent safely into canyon of Columbia river when approaching dam site. Modern Mechanix and Strikingly beautiful is this night view of world’s first all-electric city—town built on east bank of Columbia river for construc- tion workers on Grand Coulee dam project. Temporary wood bridge crossing river is expected to be destroyed by spring floods. Every one of the 360 homes, as well as the business and office buildings, will be heated by electricity. Enough heating equipment is installed to keep buildings comfortable even at 29 degrees below zero, the lowest recorded temperature in the vicinity of the Grand Coulee in 22 years. In addition to the heating units, each home has an electric range and electric refrigera- tor. Some of the larger homes will be Chimneyless homes like that shown at right were erected by crew of six men at rate of six a day, after lumber was cut to size and trimmed in Spokane mill. Inventions, April, 1935 equipped with complete air-conditioning plants. The heaters used are portable, the plans calling for 1% to 6 kilowatt units in each ofthe rooms. Twenty-eight thousand heaters will be needed for the first 360 houses. The cost of installing and equipping a five-room house with these heaters will be approxi- mately $160, as against about $250 for a [Continued on page 129] Left: Interior of one of five-room electric homes provided for workers building Grand Coulee Dam at Mason City, Washington. Port- able electric heaters in 17/7 to 6 kw. sizes, like that under windows, are used in each room.

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CLIPPING DOLLARS FROM TABLE SHOWING COMPRESSION RATIOS OF WELL-KNOWN CARS FOR MODELS OF 1931-34 VICK 34-60 CADILLAC v-iz A MENE | HUPMOBILE NNO = ie. PPA aun Experimental engineers are shown checking gas mileage after a test run. Each can holds an exact measure of various testing fuels. A SQUAD of marathon drivers recently piloted cars of all makes over western highways in a series of gruelling road tests. Attaching to each a special gasoline tank con- taining an elaborate series of measured com- partments, and using precision odometers re- cording distance down to 1-1000th of a mile, they put their automobiles through weird and racking ordeals. They ran them up-hill at a snail’s pace, raced them into the wind, climbed to 10,000-foot mountain peaks, made rocket-like getaways, and squealed to sensa- tional stops in clouds of burning rubber smoke. They tried every gas and oil known to man in various combinations, using high precision instruments to record the results. Then, from notebook, table, and chart, they read figures which revealed secrets of stingy driving by which a driver can actually cut his gasoline bills as much as fifty per cent. 64 | 5.23 1932 [1931 ot P| 528 | 530 5.51 6.50 Above—The intake and. ex: haust ports of a populat car ate separated to lower tempera- ture and prevent pre-combus- tion. Below—A calibrated measure full of fuel is attached to window to test gas mileage. Do you know your engine’s compression ratio? Probably not three drivers in a hun- dred do, yet this information is important in choosing the right fuel for economy and power. Do you know what octane number is best to use? Are you on speaking terms with SAE numbers in grading oils? These things are more than obscure engi- neer’s jargon; they mean a chance to fit your car with gasoline tailored to meet its needs, Modern Mechanix and AUTO RUNNING EXPENSES by MAXWELL REID GRANT. A e A ae Above left-—Adjusting a carburetor for leanness and idling speed helps keep the motor in tune. Below— The “octane selector" ad- justs the motor to handle the fuel that is being used. and to save many dollars in fuel, oil, and re- pairs. The way you drive probably has more to do with your gasoline bill than any other factor. Records prove that modern cars can be run economically. Last year the dealers for a popular make of car staged a "Scotch driver" contest, in which the public was in- vited to see how far they could drive on a pint of gasoline. accurate glass measuring tube, attached to the window beside the driver, so that he could Inventions, April, 1935 Ra The fuel was put into an A bov e— Charles F. Becker is shown at the controls of the elaborate equipment used to test gas consumption under várying conditions. Left —Adjusting the heat control on a popular car prevents waste from im- perfect fuel combustion, see for himself how much he was using. Rub- ber tubing connected the device to the fuel line. All contestants drove over the same route, which was fairly level but took them through some city traffic. When the scores were turned in, many peo- ple refused to believe them, for the winners drove as far as 50 miles to the gallon! There was no trick, however. "Scotch" driving, plus a carefully tuned motor, was the secret. Automobile men are chuckling over a story that is still going the rounds. Dealers for a light car no longer manufactured, set out to [Continued on page 123] 65.

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CONCRETE JOIST SECTION. 68 Pre-cast concrete joists are shown above in place. Concrete beams sim. plify build- ing and make home fire-resis- tant. They form deco. rative, rigid floor joists. From chimney top to basement the 1935 home is new. If you want your home to keep step | with science, read this story. This modern, entirely fireproof home was built for $2,700. It is 100 per cent concrete. Cement paint covers the walls. Ej are rising, hammers are ` swinging and new roofs are gleaming in the sun! America is building new houses! In 1933 and 1934, we built less than 80,000 family homes, a pitiful total for a nation of 30,000,000 growing families. Conservative authorities declare that we have a shortage of more than 600,000 homes. This year will see 100,000 new houses built, possibly more, as the gigantic task of home-building gets under way. The 1935 model is not just another house. From chimney top to basement it’s new. More than 300 materials, structural, decorative and otherwise, new to what commonly was in usage six years ago, are now on the market. Scores of others are in the laboratory stage. Science has turned house-builder. It offers the builder a product that, in some respects, is as far in advance over the old-fashioned house as today’s automobile is ahead of the earliest models. The house that science already has built and is building today cuts fuel bills. Reductions Modern Mechanix and BUILDS the MOIDIEIRN THOME This Cape Cod cottage with latest home improvements was built for $6,000. Walls are of concrete, painted white, of fifteen to thirty per cent are common mat- ters of record. The new house cuts the cost of summer cooling and promotes the efficiency of air-conditioning apparatus the year around. ` It saves steps. Where a woman walks four miles a day doing her work in an old- fashioned house, she walks three or less in a modern house of equivalent service. The house science is building is far easier to keep clean and far more healthful. It is justi- fying lower insurance rates and other main- tenance costs. It is more successfully built to withstand storms of all sorts, fires, and in- sect ravages. It is styled for the times and for the people in step with the times. Common sense is replacing convention. The above statements are not claims. They are facts. Houses already up and occupied prove every assertion just made. This article does not relate to the "fad" house or the “freak” house. The new house that science is building is as natural as the automobile and fully as necessary. Economy, greater simplicity, smart new Inventions, April, 1935 Blankets for the house roof and walls, such as the above, are made from limestone, slag, glass and other materials to reduce heat losses and keep out summer temperatures. style, interesting use of color—these and other generalities apply to the new house, but take a look at some of the specific products that go into this new American abode. Air-conditioning and the new insulations it has inspired, form one of the most interest- ing chapters in this new building drama. Just recently, engineers dusted off an old scientific principle and put it to work to make modern 69

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ern pike its background grayish coloring. SCALES ABOVE GILL COVERING MUSKELLUNGE NORTHERN PIKE SCALES EXTEND HALFWAY OVER GILL COVERING PICKEREL SCALESCOMPLETELY Ar CÓVER CHEEK AND GILL. SEE i To identify pike family note the scale covering on the cheeks and gill covers. The lower half of the cheeks and gill covers are free of scales in the muskellunge, while the cheek of northern pike is completely scaled, but only half the gill is covered. Both cheek and gill are completely scaled in pickerel. 74 At left—-A muskellunge and north- i ging side by side. Em spots in even rows on the pike identify it from the muskel- lunge which has darker spots than NORTHERN PIKE - BACKGROUND-GREEN WITH YELLOW OR WHITISH SPOTS. IN EVEN ROWS, 14 TOI6 GILL RAYS ORBARS. A A blindfolded person could identify the ree pike members by counting the gill rays or bones as shown in above sketch. Sore G as it may seem many fisher- men can not specifically name the fish they catch. They will say, “It looks like a perch” or “It’s a bass,” but whether it is a large mouth or small mouth, they can not say. In some ways this is true even among ex- perienced fishermen. Some of them can not distinguish between the pickerel and the northern pike, and the northern pike and the muskellunge. No greater confusion exists than in identi- fying the members of the pike family which includes three species, the muskellunge, great northern pike, and pickerel The tendency is to bracket the great northern pike and the three members of the true pickerel species into one. In the same way the muskellunge and the great northern pike have been con- fused. Some fishermen believe that when a great northern pike grows large in size, it becomes, not a pike, but a muskellunge. Hence we often see a large pike panned off Modern Mechanix and ‘CAMPFIRE know your fish, the PICKEREL BACKGROUND- GREEN WITH DARKER STREAKS, VEINED MARKINGS, II TOI3 GILL RAYS. MUSKELLUNGE BACKGROUND— GREY WITH K DARKER SPOTS. , ITTOISGILL RAYS ROBERT PAGE LINCOLN Hunting and Fishing Editor The “pickerel” you ate catching may be ‘small northein pike. Although you may ISMALL MOUTH USUALLY BROWN “statements of this ex- á \ BACKGROUND. pert may surprise you. os TRIPE Line drawn through eye of bass, as shown ati righe willldistinguish amali mouth from the large mouth. Red eye of small mouth will identify it. Scales of small mouth bass are small. as muskellunge. Every fisherman to gain the most out of the fishing pastime should know the fish he angles for! While there are three varieties of the muskellunge in North America (the only place in the world where the species is found), they are all very much alike, save for a few varying spots, blotches, or bars on the body. The three varieties are: the northern or un- spotted muskellunge (Esox immaculatus); the spotted or St. Lawrence muskellunge (Esox masquinongy); and the Chautauqua muskellunge (Esox ohioensis). All three may be found hobnobbing in common in the same water. The fisherman should know that a muskellunge is a muskellunge whether it is unspotted, spotted, barred, or striped. So far as size and length is concerned, the great northern pike rarely comes up to the mark set by the muskellunge. Following the same line of comparison it may be said that few true pickerel ever get as large as a six or eight pound great northern pike. Most pickerel range around a foot to fourteen inches in length. In coloration alone the muskellunge differs from the great northern pike, the only fish with which it could possibly be confused. The background coloration of the muskellunge is some shade of gray, either light or dark gray, whereas the pike is green in background color, Inventions, April, 1935 MOUTH BEHIND | BACKGROUN LINE THROUGHEYENN S. GREEN WITH MOUTH AHEAD VER | OF LINE THROUGH EF HUA OR BROWNISH GREY | BLACK STRIPE] Above is an excellent specimen of a muskellunge caught by the author. It weighed 35 pounds. It was partly blotched or spotted with wavy streaks, At left is a large mouth bass. Note its flabby stomach which is not found in the small mouth bass. The background coloring of the large mouth is green. > LONG,SLIM BODY TWO BACK FINS The wall-eyed pike and sauger are really members of the erch family. Both look much alike. The sauger, however, is a slimmer fish, is lighter in coloring, and usually weighs less. The body of the wall-eye is rough. Pike family mem- bers have slimy scale covering and have just one back fin. 75

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MARKINGS IDENTIFY Four Species of TROUT - BROOK TROUT WORMTRACK MARKINGS ON RAINBOW BACK AND DOR- | TROUT SAL FIN. RED BLACK SPOTS. Slee REDDISH OR PURPLISH BAND ON SIDE RED SPOTS LARGER THAN BROOK TROUT Distinguishing characteristics of four trout commonly found in American waters are shown above. Brown and brook trout may be confused, but the latter has small scales scarcely seen with the eye, small red spots, and worm-track marked fins. sometimes light green and sometimes dark green depending upon the water from which it is taken. On the grayish background coloration of the muskellunge there are darker spots or blotches. In comparison, the spots on the great northern pike, instead of being dark, are pale yellow or whitish and are set more or less evenly in rows up and down the sides. These rows of spots on the side are possessed alone by the pike; the muskellunge does not have them, nor do any of the true pickerel. These rows of light, yellowish spots should at once set the pike apart from the other members of the pike family. Two unfailing means of recognizing the members of the pike family is to take note of the scaling on the cheeks and gill covers and to count the number of rays or bones in the gill covers or opercles. In the muskellunge the upper part of the cheeks and the gill covers are scaled, the lower half of each being free from scales. In the great northern pike the cheeks are com- pletely scaled, but the lower half of the gill covers are bare of scales. In the three true pickerel both the gill covers and cheeks are covered with scales! Spread the gill cover of a member of the 76 WHITISH SPOTS ON GRAY BACKGROUND This 34-Ib. lake trout was caught in the Lake of the Woods, Minn. Except at the tail, most of its spots have vanished. pike family whose identity you wish to es- tablish. By running your finger and thumb along the lower edge of it you will note the bones that line it, being about a fourth of an inch apart. These bones, or branchiostegal rays, as they are called, aid the fish in open- ing and closing the gill covers as it breathes. The number of bones in this gill cover tells you what sort of fish you have. In the muskellunge each gill cover, left or right on the fish, contains each 17 to 19 of these rays. The great northern pike ranges 14 to 16, while all three pickerel have 11 to 13 rays in each gill cover. It is interesting to state that one should be able to tell any of the three members of the pike family apart with eyes closed, merely by running the fin- gers over the gill cover edges and counting the number of rays that each possesses! There are three pickerel recognized in this country, namely, the eastern or chain pickerel (Esox reticulatus); the little pickerel, or [Continued on page 124] Modern Mechanix and Following the Birds o s, 1 TURNSTONE 2,000 MILES | OVER OPEN WATER UNITED STATES HAWAIIAN ISLANDS Photo Courtesy Chicago Academy of science Above—A map of North and South America with dotted lines indicating some of the record flights made by migratory birds. Inset—A pair of arctic terns and a fledgling. Terns hold the record for distant flights, flying 11,000 miles each way. VER unmarked airways, along coastlines, above mountain ranges and river courses sturdy wings are beating steadily to bring the most intrepid flyers of the airways, the birds, back to their northern haunts. The early arrivals, the robins, the phoebes, and the blue-birds are already on their way and, like a well-drilled army, other hosts will follow shortly. And the northland nesting grounds will again be filled with meadow larks, warblers, thrushes, swallows, swifts, martins, orioles, and countless other migra- tory birds. It is a strange movement, this annual mi- gration of the birds. Man gasps in amaze- ment at some of the feats the hardy travelers perform in their semi-annual trips ranging from 1,000 to 11,00 miles in length. Even the common robin and many of the other smaller birds make sustained trips of 700 miles with- out food, and the golden plover, flying be- tween northern South America and Labra- dor, goes in a direct route, 2,400 miles over the open waters of the Atlantic, without food or rest. The turnstone, another trans- [Continued on page 130] Inventions, April, 1935 amem 0 Em. Migratory Trek SINGLE FLIGHT 700 MILES GOLDEN PLOVER 2,400-MILE NON-STOP FLIGHT Photo Courtesy Chicago Academy of Seience Above—Juncos and finches feeding around a trap. In circle—An upland plover on her nest near Chicago. The upland plover spends his summers in North America and winters in Argentina. SOUTH NJAMERICA 1 G RECORD FLIGHT i 11,000 MILES BE- ‘pf TWEEN PATAGONIA I 1 I I i ARCTIC TERN Y 9 e. AND ALASKA Right—The photo shows a bird enthusiast attaching a band to the leg of a young herring gull. The bands are numbered, and a rec- otd is sent to the gov- ernment Biological Survey telling the species of bird, the band number, and the locale in which he was found for future study.

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CREATING LIFE LIKE HERE do the horrors in the wax mu- seums come from? This question may have troubled you as you paused in a side show for a few pleasant.shudders. So realis- tically are they made, so gruesomely exact jn every tiny detail, that it would seem the artist must have had the original models pose ` especially for him. Let us visit a man in St. Louis who manu- factures these macabre specimens in his workshop. It surely will be exciting, and we may learn something in addition. Arriving at our destination, we opened the door with shivery anticipation— Instead of the ghostly, dimly-lit labora- tory-studio of cobwebs, shadowy corners and bobbling witches' kettles—presided over by some evil-visaged, misshapen gnome, 82 Left—The artist takes the first step on a model of George Washington by molding a clay model. Above—Preparing a notorious western bandit for the "death act." Only exposed parts are wax—clothes cover papier mache body. Left—The worker building up the back panel of a plaster mold over the first clay model. Center—Pouring the wax into the plaster mold. Right—Breaking the unfinished wax head out of the mold. It is now ready for hair and teeth. which we expected, we found just the oposite. A stout, jolly man of about forty-five, with a booming, cheery voice, bade us welcome. “How do I do it?” he laughed. “Come right in. Bill and I are just running off a cast of George Washington!" We stepped into a well-lighted, well equipped workshop. Bill, a soft-spoken young man of twenty-two nodded a greeting. Mr. Christophel walked over to a well ex- ecuted head of George Washington, sculp- tured in modeling clay. “This is the first step in making wax figures," he stated. "I'm just putting the finishing touches to it now. Next—" he reached for a bottle of oil “I Modern Mechanix and Figures For WAXd \ by HAROLD L. ZIMMER Washington, Roosevelt, Billy the Kid, Jesse James! All the world’s most color- ful figures stand out with startling reality in a wax museum. This article tells how workers transfer a simple photograph into amazingly life like figures sculptured in tinted wax. a ! : ^ i 1 Right—The author, Harold Zimmer standing between wax models of “Wild Bill" Hickock at left and the famous fighter, Billy the Kid. Left—Inserting the teeth grease the clay head thoroughly, to keep it from sticking to the plaster. “People often wonder why the figures are so true to life. This is a compliment to the sculptor, for he seldom sees the original model —most of them being dead—and must go either by old pictures found in books or—as is sometimes the case—from a newspaper clipping. Figures of modern notorious char- acters and celebrities are often found in this way. “A wax worker’s art is not always gruesome," Chris continued, taking the fin- ished clay model over to where Bill was [Continued on page 122] Inventions, April, 1935 I Y. and applying the finishing touches on the features. Center g the eyelashes. Each hair is driven into the model with a pointed punch to gain natural appearance. Right—Human hair, each one individually inserted, is used to complete the model head of George Washington molded from special wax. aid Maiti The breathing mechanism exposed. A silent electric, motor runs a reduction gear which is timed to conform with regular breathing. The machine can be regulated to produce the breath of a sleeping beauty or the gasps of a dying bandit. 83

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Hear All-W ave Though no plug-in coils are used, pro- grams down to 35 meters can be heard with speaker volume on this powerful long and short wave portable receiver.

Set your toolbox portable anywhere, connect up antenne, and ground leads, flip the switch, and take your pick of music, police calls, or amateur short wave broadcasts o'er the con- tinent. Switch for long or short antenna is on back cover.

GROUND ROTORS .. TO PANEL * USE PHONES FOR DISTANCE. NEN E | | MEG. RHEOSTAT | WITH SWITCH |

f i 5 1 i | | | BN POINT anton / TO SPEAKER ; 7 G PRONG ISOLANTITE SOGKET FOR COIL NOTE i= USE RUBBER GROMMETS WHERE WIRES GO THRU : ~ CHASSIS Mounting of parts atop chassis is shown in above sketch. Ordinary 8 mh. choke gives same results as low-loss type shown. 90 Programs With IMPLY connect up the aerial and ground wires, and this powerful little receiver is ready to pick up stations anywhere in this country, on any band from 35 to about 370 meters, with good volume on the built-in midget loudspeaker. Take it anywhere—on a canoe, cruiser, or along to camp this sum- met—it doesn’t take much of an aerial to pick up stations on the broadcast band hundreds of miles away. Í An ingeniously wound coil covers four different bands simply by changing the set- ting on a four point selector switch. There is none of the nuisance of carrying along plug in coils for the different short wave bands, and opening up the set each time you wish to change bands. Everything is built into the single tool box cabinet. Light weight B and C batteries give unusually long service, since the current drain with the circuit used is very low. Two dry cells supply filament power. Rain or snow have no threats for this sturdily built receiver. Its depend- -50 MMFD. BAND SPREAD g CONDENSER ON MFD. TUNING CONDENSER æ — 00012 MFD. MICA CONDENSER — — 5 MEGOHM RESISTOR y Wi .00012 MFD. MICA CONDENSER AUDIO TRANSFORMER CONNECT TO | WIRE OF COIL Lo - — GRID CAP FOR '32 ee OF TUBE SHIELO f SPEAKER 7 buc AN s TONE CONTROL... cP sree -—7 8MH. CHOKE... |.— 7 BANO SELECTOR --— SWITCH PHONE JACK ~ -- TUNING CONDENSER Ss, 2 BAND SPREAD CONDENSER Sx Inventions, April, 1935 BOX Portable either for selecting the tone desired or for cutting down background noises on local re- ception. i A 16" by 714” by 714” 22-gauge steel tool case is used asa cabinet. It presents a fine ap- pearance and takes very little machine work.

- METAL CASE LINE INSIDE WITH CARDBOARD Ba SHELF FOR SET SPEAKER 20 OHM RHEOSTAT 5 uen. CONDENSER « 2 zd =~ AUDIO 7 Ea eleK else hae) 22206513! TOR BOND ALL GROUND CONNECT- IONS TOGETHER WITH HEAVY WIRE INSTEAD OF SOLDERING TO THE CHASSIS

\ / MES l ^; MEGOHM REGENERATION CONTROL 91

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Build “MIDGET eMILLER’ by WESTON FARMER PART I HIS midget car is a scale model of the famous Miller Dirt Track Special. Built . for Merril M. Madsen, of Minneapolis, Minn., dirt track racer and owner of a real Miller, it combines beauty and speed with simplicity of construction. The car shown in the photos is powered with a 34 h.p. Briggs and Stratton motor with a kick starter reached by raising the rear hood. This motor develops a speed of 20 miles an hour. The plans and specification given, however, will do for the power head of an out- board motor or one of those washing machine motors that can be found most anywhere. Unlike most midget cars, the “Midget Miller” has a clutch and a gear shift for for- ward and reverse that is a simple arrangement of V pulleys and a belt. The car can stop, start, and reverse and come to a proper halt for traffic signals. The body of the car can be built of sheet metal or of wooden molds with chicken wire and fabrikoid cover. The first step in construction is the frame, made of two oak stringers, 1"x4" and 62” long. These are joined by separators, as shown in Fig 2, with 2" No. 14 steel screws. The rear piece is molded as shown from 2"x3" fir. A tie rod of J4" cold rolled steel is threaded and fitted in a slot in the bottom of this rear tie piece to strengthen it. The nose piece may be of the dimensions shown in Fig. 2, which is sketched as a sug- gestion as to how to handle this part. This nose piece can be cast, or it may be built up of 10 gauge sheet iron, welded at the seams. Below—A side view of the ‘Miller Midget" racer. Balloon tires come with the wheels. The gear shift is a simple arrangement of pulleys and sliding motor block at rear. 94 Miniature copy of the famous Mil- ler dirt track racer, this midget has class, beauty, and speed, yet is easily built with common workshop tools. At right —Top view drawing of midget facer. Front springs are fastened to nose piece block. Be- low—-A reat view. TREAD IS 30" Fol MODEL'T* BRAKE RODS SPRING LEAVES FORM FRONT AXLE / FORWARD, REVERSE ROLLER BEARING Modern Mechanix and A AVA - a Model Photo at right shows graceful lines of the midget. Front spring mounting and Model T brake rods used for tie rods can be seen. All parts, except wheels, tires, and motor, can be built up in the average home workshop. If the nose piece is built up, the spring perch should be an iron or steel block welded and bolted as shown. A hole for the foot of the & steering column is cut in the bottom plate. Steering is done with a Model T steering column given half a revolution so that the foot or dash plate rests on the nose piece instead of the usual dash- board. Holes are drilled into the bottom plate so the dash plate can be fastened with bolts. The driver’s feet and legs go under the front hood. They rest on the 16 gauge metal floor, extending from the front seat support to the nose piece. The rear axle is one-inch cold rolled steel [Continued on page 126] Construction of the frame and nose piece, shown here, is not difficult. Spring perch must be iron or steel for safety. Model T steering column goes through long hole in nose piece bottom. Drill 2" holes for 1" steel rod rear axle. FIG. 2. FRAME CONSTRUCTION OF MIDGET MILLER | 16 GAUGE SHEET METAL FLOOR. SLOT IN NOSE PIECE FOR STEERING COLUMN X e ROUND HEAD SCREWS “Dirt ©rack‘Racer rn MENSIONS SHOWN - THESE PIECES ^; SPRING PERCH IS NOT SERE a enous P 4 97 DETAIL OF NOSE PIECE AND FRONT. SPRING PERCH FOR MOTOR SLIDE PLATE STRENGTHEI ING ROD FRAME OF OAK

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Boy-Power "STEAM SHOVEL" Shoveling sand in summer, snow in win- ter, this boy-size "steam shovel” is a year B ; round source of fun for the mechanically inclined youngster who craves action. by RALPH T. MOORE IKE the giant steam shovels used in cut- ting out highways, this boy-powered shovel digs into miniature sand mountains, pivots about realistically to re- lease its bucketful of earth over a waiting toy truck or railroad gondola car. Hands and feet of youthful operators must move in coordination as boom and dipper are maneuvered back into posi- tion for another “bite” at the back-yard sand pile. Winter brings no period of rest to this sturdy shovel. Watch the one-thousandth cubic yard capacity dipper scoop up snow from the sidewalk, pile it neatly to one side of the path. The position of the boom is controlled by the lever at the top LEVER of the cab, and may be set at LIFTS four different heights. The slid- ing movement of the dipper in- side the boom is taken care of CONTROLS Vax ilgx ia" BUCKET DUMP CORD PES SCREW-EYES mn by the left control crank, and the AT 9 TO forward motion of the bucket by RIG HAND "n : B CONTROL the right crank, Turning is done Rum" with the feet, the rear wheel being pivoted. WINCH DRUM, THEN Plywood, a few scraps of soft c " TO DIPPER ARM CAB TOP 4 CUT OUT WHEEL BRACKET FOR NUT Bresse NS SE SSE IST ARS WINCH - CAM DETAILS Details of construction and assembly of steam shovel are LEVER BRACKETS SOC covered in above sketches and photos. Control winch, on LEVER BRACKETS right side of cab, has locking cam which holds up the dipper. 00 Modern Mechanix and Moves WAiniatune MOU NTAINS pine, some pieces of sheet metal, and a few odds and ends of wire and bolts are the only materials needed in con- structing this shovel. Build the dipper or bucket first, as- sembling the plywood sides with glue and brads. Cut two hinges for the door from 20-gauge sheet metal, bend- ing as shown in the sketches. The dump lever is cut from the same ma- terial, and fastened to the dipper door with small wood screws. A small spring fastened to the dip- per keeps sand from forcing open the bucket door. An 11” length of stiff wire is bent to form the dipper bail; this snaps into place. Saw out the base board, the seat, and the front wheel bracket arm Here's how the completed shovel will appear. Bucket release cord is held in hand. Boom is at highest position here. LJ CIEE 15, 8%, WAND 29% DETAILS OF BOOM ALL i STOCK L from 1” stock, sanding the edges and then drilling as shown. The wheels may either D be cut from 144” stock on the band saw or 2 ee out on a lathe. Wheel brackets are I X2"X 7" ormed from 1%” thick strap iron. SEAT BLOCK A Use strong chalk line in rigging the shovel. Small screw eyes serve as guide pulleys. Assembly of bucket, base, and boom arm are covered above. Two coats of paint complete the shovel Red, black, and grey is suggested combination for the shovel. Inventions, April, 1935 101

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Unfolding the eMysteries by SAM S. RABL Naval Architect

SHEER LINE FIG. 3- PORTION REMOVED AT CENTER SHOWING A BUTTOCK PLANE

O THE seasoned boatbuilder the terms used by a naval architect in describing the design and building of a new boat have a world of meaning; to the beginner they can be as puzzling and in- coherent as a foreign language. Laying down is the term applied to the process of enlarging the small scale draw- ings of the architect to full size; this must. be done before a single timber can be cut for the boat. Taking off is the term applied to the transferring the curves and SSE ae dimensions on this full size plan to the frame timbers of the boat. Before we go into the mechanics of the WATER LINE

TRANSOM FIG.2 SKELETON VIEW OF LINES AS SHOWN IN e FORWARD PERPENDICULAR Phantom drawing of a typical boat, shown in Fig. 2, gives indication of positions of lines used in dimen- MC MIS sioning. Base line is reference line chosen arbitrarily, STATION LINES: and usually passes through lowest point on the keel.

FIG.4 - PORTION REMOVED SHOWING A WATER PLANE

STATIONS BUTTOCKS SHEER SHEER va STEM WATER LINES «x

TRANSOM V < LOAD WATER} LINE ra iS

pem Ww [BASE LINE | _4DIAGONAI ea TRANSOM | | FWD. FRAMES 2 AFTER FRAMES [Ñ CENTER LINE. BODY PLAN |< FORWARD PERPENDICULAR

6

FIG. i LINES OF A ROUND BOTTOM BOAT AS THE ARCHITECT LAYS THEM IN HIS DRAWING -WITH |. EXPLANATORY TERMS APPENDED

These three views—profile, body, and plan, are sufficient when accompanied by table of offsets, to give all information needed by experienced boat builder. In process of "laying down" these views are enlarged to full size on shop floor. 106 : Modern Mechanix and of BOAT Plans To one planning to build his first boat, the plans and specifications of the naval architect are a maze of hieroglyphics— a discouraging stumbling block. This ex- perienced designer here explains how: to follow boat-building plans properly.

actual laying down, an explanation of the terms used in this process will be a great help. The complete set of curves that depict a boat shape is called the lines. The lines plan is usually divided into three views. The pro- file depicts the shape of the boat as we see her from the side in normal position. The plan. is really a “fish-eye view,” p sc showing how the boat appears when looking at her from a point directly beneath her keel. Lay out full size plans om wrap- ping paper before cutting lumber.

The body plan shows the boat as she would appear if we were to look directly at the ends. This plan is usually drawn with SHEER the forward frames on one side of the center and the after frames on the other. The two sides of the hull are seldom drawn, as the SERT shape is supposed to be symmetrical The S lines which represent the frame or mould positions are known as the frame lines or sta- i SHEER $ WIDTH

MATHS NOH tion lines. Examples of each view are shown 3 i DIAGONAL in the sketches accompanying this article. [i CHINE All vertical dimensions on a boat are usually ites HEM 7 \Reigess [enor TYPICAL TABLE OF OFFSETS — |__| Frame WO.| o 7 KEEL | le SHEER Sais € TRANSOM || SOTIL ee S Wii e P OREMENTS ON " V" BOTTOM FRAMES BS easar 2:07; | 7-5-9 duco a FIG.6 — MEASI i KEEL 1-6-1 | 1777-8 EL I "ud -00| jaa 3 SHEER ZANR Ni

| TRANSOM H :

PROFILE

HALF. SIDING; LOF KEEL PLAN : J . FIG.5 TYPICAL "V" BOTTOM LINES SHOWING PROJECTION OF THE BODY PLAN m d V-bottom boats offer slightly different building problems fron round-bottom craft, but three views are still sufficient to represent the boat. "Typical table of offsets, giving dimensions with reference to the base line and center line at different sta- tions, is shown above. Dimensions are given in feet, inches, and eighths. 5-8-2 is then 5’, 81⁄4”. Meanings of sheer and chine are shown in Fig. 6, above. LWL is low waterline, where the boat should float when empty. Base line is reference line.

Inventions, April, 1935 107

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Make Projections from Full-Size FIG.7- PROPER WAY TO TACK DOWN A BATTEN FOR DRAWING CURVES PROFILE | T Joss FIG.8 PROJECTION OF UTTOCI SHEER PROJECTION OF W.L.ENDS c OF BI 8 or B2 BOAT-BUILDER'S DICTIONARY LINES—set of curves giving shape of boat. PROFILE—view looking at side of boat. PLAN—view looking at bottom of boat. BODY PLAN—view looking at end of boat. BASE LINE—arbitrary height reference line. CENTER LINE—reference line for widths. BUTTOCK—line through hull formed by vertical slice parallel to center-line. WATERLINE—line through hull formed by horizontal slice parallel to reference line. OFFSET —distance from either reference line. BATTEN—wood stick used to draw curves. TRANSOM ——stern end of boat (usually flat). SPILING—transferring planking curves. STEM—curved frame piece at bow of boat. SHEER—highest line on profile. CHINE—intersection of sides with bottom. FIG.9 108 TRUE SHAPE OF TRANSOM PROJECTING THE TRANSOM Plans to Check Fairness of Lines given with reference to the base line, an arbitrarily chosen line passing the length of the boat just under the keel or lowest. point. On plan views the projection of the base line is always known as the center line. Any horizontal cut through the hull parallel to the base line forms a plane which would be called a waterline if we were referring to its boundary or a waterplane if we refer to the entire plane. If on the other hand. we were to make a cut through the hull in a vertical plane parallel to its centerline we would form a buttock and buttockplane or vertical plane. In some old books we may find what we term the buttocks today divided into two classes of lines, The forward portions were termed the bow lines, and those at the stern end buttocks. A diagonal cut through the hull lengthwise with one edge parallel to the centerline is termed a diagonal; this type of line is often used to give measurements which, be- cause of curves in the hull, would be incon- venient to give on either waterlines or but- tocks. In the preliminary examination of a set of lines a good rule to remember is “Waterlines always appear as straight lines in the profile and as curved lines in the plan. Buttocks always appear as curved lines in the profile and as straight lines in the plan. Station lines appear as straight lines in both profile and plan. Waterlines and buttocks as well as diagonals appear as straight lines in the These “laying down” methods are used for round bottom hulls. NOTE. SHAPE OF TRANSOM PROFILE 4S ELONGATED. TO MAKE DIAGRAM CLEARER PROJECTION THESE DIMENSIONS X ALSO SHOW IN BODY PLAN Modern Mechanix and Keel and Stem of Boat May Be Accurately Laid Out from Large Plans body plan while station lines will appear curved.” MS The foregoing rule applies to boats with V^ full curved sections, shown in Figures 1 to 4. The “V” bottom boat presents a slightly dif- ferent problem but the lines are much more simple. An examination of Fig. 5 will serve to explain them. Fig. 6 shows how measure- ments are taken on the curved frame "V" bottom craft. The architect in making the lines plan of a wooden boat always works to the outside of the planking. This should be the rule un- less it is positively stated on the plar that the lines are to the inside of the planking. In drawing the plan the architect uses a pre- determined scale; usually 34" or 1" repre- sents 1 ft. on the actual job. To give measurements on the lines the architect either furnishes a table of offsets or gives the measurements directly on the wLa plan. An offset is either the distance a cer- tain point is from the centerline in case of widths, or above the base line in case of heights. Vertical offsets are sometimes taken above and below the load waterline. Offsets are also given along diagonals. , Almost invariably offsets are given in feet, inches, and eighths. Thus 3-7-5 when trans- lated will mean three feet, seven inches and five eights, or 3-798". A rule to remember in reading offsets is that half widths are given out BASE from the centerline, and heights are given with reference to the base line or load water line. [Continued on page 118] RABBET Rc BACK RABBET TYPICAL RABBETED KEEL & STEM PIECE: KEEL STEM JOINT CUTWATER FACE ON STEM wL3 | FWD. EDGE OF STEM FiG.1Q | SHOWING HOW| KEEL & STEM SECTION ARE OBTAINED FROM FLOOR LINES THIN BOARD (SPILING BOARD) LAID ON FRAMES DIVIDER PRICK OR'TICK MARKS: LINE TO BE FITTED |. Picking Up THE CURVE WITH A SPILING BOARD BEND TOLINE AND NAIL TO FLOOR ARCS SWUNG FROM DIVIDER TICK MARKS ON SPILING BOARD EINESON TOBE FiTTED FLOOR 2. TRANSFERING CURVE TO PLANK PLACE UNDER SPIDER READY FOR MARKING OFF Method of transferring curves from partly finished boat to next piece of planking is indicated above. Planks should fit perfectly without need for excessive forcing into position. Keep dividers at right angles to plank already on boat to get the correct distance. Inventions, April, 1935 109

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