Modern Mechanix, July 1936

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Rake aa i EJ ] ~~ s MOTORIZED SURF-BOARD ; SEE PAGE 69 ; ~a "gi

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Yet a few weeks ago they laughed at his skinny shape I'M SO SKINNY, NO sy f 1 USED TO BE SKINNY | |A FEW WEEKS LATER F GEE, JIM, I WISH Pe TOBE SKIN GIRL CARES FOR ME. | HAD A BUILD WHY CHARLIE! WHAT \/ WISH I'D KNOWN IRONI s ITS : ONIZED YEAST. IT'S | | WAVE YOU DONE TO || WHAT TO DO SOONER. GET SUCH A BUILD? || IRONIZED YEAST YOU'RE AS HUSKY BUILT ME UP IN WISH | WERE LIKE JIM LIKE YOURS PUT 20 POUNDS ON ME NEW “7-POWER” ALE YEAST OFTEN ADDS 51015 iss.—in a few weeks! OW there’s no need for thousands to be “skinny” and friend- less, even if they never could gain an ounce before. Here’s a new easy treatment for them that puts on pounds of solid, naturally attractive flesh — in just a few weeks! Doctors now know that the real reason why many find it hard to gain weight is they do not get enough digestion- strengthening Vitamin B and blood-building iron in their daily food. Now with this new discovery which combines these two vital elements in little concentrated tablets, hosts of people have put on pounds of firm flesh —in a very short time, Not only are thousands quickly gaining normal good-looking pounds, but also naturally clear skin, freedom from indigestion and constipation, glorious new health and pep. 7 times more powerful This amazing new product, Ironized Yeast, is made from special cul- tured ale yeast imported from IHurope, the richest Known source of Vitamin B. By a new process this yeast is concentrated 7 times — made 7 times more powerful, Then it is ironized with 8 kinds of iron. If you, too, need Vitamin B and iron to build you_up, get Ironized Yeast tablets from your druggist at once. Day after day, as you take them, watch flat chest and skinny limbs round out to normal attractiveness, skin clear to natural beauty —you’re a new person. Money-back guarantee No matter how skinny and rundown you may be from lack of enough Vitamin B and iron, this new Ironized Yeast should build you up in a few short weeks as it has thousands. If not delighted with the results of the very first package, your money instantly refunded. Only don’t be deceived by the many cheaply prepared ‘‘Yeast and Iron” tablets sold in imitation of Ironized Yeast. These cheap coun- terfeits usually contain only the lowest grade of ordinary yeast and iron, and cannot give the same results as Ironized Yeast. Be sure you get the genuine. Look for “IY” stamped on each tablet. Special FREE offer! To start you building up your health right away, we make this abso- lutely FREE offer. Purchase a package of Ironized Yeast tablets at once, cut out the seal on the box and mail it to us with a clipping of this paragraph. We will send you a. fascinating new book on Posedby health, “New Facts About Your Body? Remember, results with the professional Very first package—or money refunded. At all druggists. Tronized models Yeast Co., Inc., Dept. 567. Atlanta, Ga.

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A Million Miles from Nowhere... in the Dark “It’s Spooky to be Helpless in the Dark in Bandit Country,” says Albert Williams “Imagine the roughest mountain road you ever saw,” writes Albert Williams. “Recall the loneliest spot you were ever in; the things you have read of beasts and bandits in Old Mexico, and you have the midnight setting EVEREADY BATTERIES ARE FRESH BATTERIES {a ONE REASON WHY THEY LAST LONGER | POR BEST RESULTS SOT BERS Su 2 1 CAN UNDERSTAND in which the generator of my car chose to blow up. The thought of a night in that wild mountain pass gave us the shudders. “Tt flashed upon me out there in the dark that here was another ‘Critical Moment.’ Of course! My big Eveready, full of fresh Eveready batteries, was the answer. “So I sat on a front fender holding our improvised headlight while my partner drove through the wild and rocky night to daybreak and breakfast. “New York seemed a million miles away that night . . . and I thought how lucky it was those batteries were fresh when I bought them a month or more before.” NATIONAL CARBON Co., INC.,30 East 42nd Street, New York, N.Y. THAT BATTERIES LOSE |: THEIR PEP AS THEY DRY OUT ON THE SHELF, BUT PM WONDERING HOW EVEREADY CAN |, |) AFFORD TO DATE THEIR BATTERIES? | IF YOU COULD STAND BEHIND THIS COUNTER FOR A DAY YOU'D UNDERSTAND THAT, PEOPLE HAVE A WAY | ` 3| OF FINDING OUT FOR | | THEMSELVES WHICH PRODUCTS GIVE THE BEST SERVICE. MORE? WHY MAN, | SELL 4,5 AND 6 TIMES AS MANY = | EVEREADY BATTERIES AS b7 | 100 OF ANY OTHER MAKE! THATS WHY EVEREADY CAN OATE THEIR BATTERIES... S i -AND MEAN IT. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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DD PRICE DERN JULY, 15 CENTS 7 i 1936 J SAME PRICE Vol XVI SAME PRICE HOBBIES & INVENTIONS dae CONTENTS SPECIAL FEATURES The Nation Sits In On National AUGUST! Lowell Thomas Writes of Reckless Pilots Conventions - «= a > > - 28 By Bob Gordon New Twin Motor Stirs Aviation - - 32 Lighting The Way For Color Movies - 36 By Earl Thiesen Found—King Solomon’s Gold Mines - 40 By James Nevin Miller England’s Wonder Giant Puts To Sea - 46 Hidden Hazards of Circus Thrillers - 50 By Tom Murray : Win a Soapbox Racing Car! - - - 54 N Brig. Gen. H. H. Arnold Surveys The tadni. Tonal Whores mated, oie Kiying Cames e = = = egi ee planes aloft, Watch tor the tileco Tet The Daredevil Dub-Menace of Auto Pilote Daring Challengers of Death” on al. oO rea it in the next issue. Racing - + e > = + = 64 By Fred Gilman Jopp SHORTER FEATURES Splitting The Waves With The Outboard Nic Sprank - - - - - - 34 Racers -. - - -= - - - 68 The Queen Mary Comes To 5 America - - - 45 By David A. Brown Young Detective Saches Police Ring - - - - - 53 Outfitting For The Canoe Trip - - 74 Movie Cartoons Gain Third , Dimension - - - - - - 59 By Robert Page Lincoln Uncle Sam’s Movies Record zje Army Life - - - - - 73 Building Usefulness Into Your Neglected More Cash Prize Winners An- Basement - - - - - - 80 nounced In Needed Inven- tions Contest - - - - - 79 Odd Instruments Win Fame For Major Housewives Welcome New Conveniences- - - - - 83 Bowes Amateurs - - Z 7 - 84 [Continued on page 8]

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Train at Home-.-Under factory Enginee GOOD PAY Spare-Jime and Full-Time Jobs fc “RADIO A LEARN TO EARN Yo ? 75 WEEK (MANY R-T-1 TRAINED MEN EARN MORE) y

< : = aS APPOINTED BY RADIO MANUFACTURERS TO SUPERVISE R-T-I TRAINING This is the R-T-I Advisory Board —Engineers and Executives of large Radio firms—appointed by these firms to supervise and direct R-T-I training. Put your future in their hands. 50 great radio manufacturers now endorse this Training. : D RAY D. SMITH President R-T-I, who has directed trainingof100,000 men. Read what a few students say. “Made my first spare time money after fine ishing four lessons. Over $500 spare time money in 10 months. R-T-I is 0.K.’* Delmer Grote, Route 5, Greenville, Ohio. + o 4 “I made $14.25 in first 11 days of my training following your instructions.’’ C. E. Head, 431 Third 5t., Alexandria, La. J * e “Before finishing my training I was made Manager of a Depart- nent Store’s radlo sec» tlon.” Howard N. Lentz, 123 W. Alexander Ste Buchanan, Mich. e A A “My job paid me $18 a week before taking your training. Shortly after starting was ave eraging $60 a week. Have made as high as $250 In single week.'* Wm. T. Ridd, 3452 Evelyn _ St., Verdun, P. Q., Canada,

Thauk You for Mentioning Modern Mechanix Hobbies and Inventions

Dept. 3-B Trained Men Needed in All Branches If you're dissatisfied with small pay—lay-offs and an uncertain fulure—here’s an opportunity that’s too good to miss, At the cost of only the time it takes you to mail the coupon you can get my big FREE book, “RADIO'S FUTURE AND YOURS.” This book tells how you can learn at home under the supervision of factory engineers, to make more money almost at once in Radio—whether you want to Make Radio your life’s work, or use it to plek up an extra $5 to $20 a week in your spare time. More Opportunities Than Ever Before Radio is still forging ahead. 1935 was Its biggest year. Over 5 million new sets sold. Over 30 million dollars paid- for service alone in 1935. Where only a few hundred men were employed a short time ago, thousands are employed today. And where a hundred jobs paid up to $75 a week—there are thousands of such Jobs today— many paying even more. And new jobs are being created all tho tHme—full time jobs and spare time Jobs, Get my book and see how casy it it to learn at home for this good-pay work. “Shop Training” for the Home Nt-T-I Training is different than any training you ever heard about. It comes to you right from the heart of the Radio Industry—right out of the factories where Radio sets and other vacuum-tube devices are made. Jt was planned and prepared and is supervised by big radio engineers IN these factorles—by men appointed for the purpose. This means that trained the R-T-I way. you'll be trained as the Radio Industry wanis you trained—just as the Radio Industry, itself, would train you if it was doing the job. Television, Photo Electric Cells, Public Address Systems Included Radio service work is only the starting point in I-T-I Training. From there it will take you through the whole field of Radio and Electronics. You will learn about every new development, in- eluding Television so you'll be ready when Television breaks. You'll also learn the ble money subjects such as Aviation and Auto Radio; Publie Address Systems; how to handle Photo Cells; Sound Picture Recording, Etc. 4 Working Outfits Furnished Start almost at once doing part time radio work. I furnish $ outfits of apparatus that you build into test equipment with which you can do actual jobs and earn extra money. My Training pays its own way and you get your money back if not satisfied. Age or Lack of Experience No Handicap You don’t have to be a high school graduate, nor even have finished the grades. My Training is so simple, easy, and practical, that the average man, regardless of age, education, or previous experience can master it. Jt offers the chance you have wanted to get out of a small-pay, no-future job, into good pay work with a future, in Radio and all its branches. Get My Free Book INVESTIGATE! Learn why R-T-I Training is different. Find out why R-T-I Trained men get “Quick Results” and “Big ltesults.” Send for your copy of "Radio's Future and Yours” today. It tells you about Radio’s amazing opportunities, It describes my approved training. It tells what It-T-I students ere doing and making. It gives the names of my Advisory Board and 50 endorsing manufac- turers. It's FREE. Clin, sign and mail coupon RIGHT NOW! RAY D. SMITH, President

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Big Money in Auto — N and Police Radio Work W. H. Carr, 402 N, 16th St., Kansas Ci Kan- sas, an R.T.I. student, has charge of ay radio equipped cars for the Kansas City Pollice and Fire Departments, Ilis sala is $230.00 a month and he is furnished with an automobile, gas, oll, etc. He says, “If I had not taken your course E would not “be able to hold this job.’*

aad Makes $600 in One Month Herbert B. Thompson, Gorman, Texas, formerl: an oil well driller, borrowed $170,00'to start X spare time radio business after completing 12 H-T-I lessons. He made money from the start. In two years his shop was worth $2500. He SANS, Because of my R-T-I Training I made $459 in September and over $600 in October, 1935. It pays to be R-T-I Trained.” MAIL FOR FREE BOOK Ray D. Smith, President, RADIO AND TELEVISION INSTITUTE (R-T-1) 2150 Lawrence Ave., Dept. 3-B, Chicago, IIl. Uaadio's Future and Yours. 7° T axe Peet! ested in your tralning and the opportunities in the great field of Radio for the R-T-I Trained Man. Name Address ~~-.nee

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frank man to PATENTS -INVENTIONS HE world of invention moves on. The Patent Office clerk who resigned his job back in 1833, because he said there was noth- ing left to invent, now stands out as one of the funniest men in American History. Think of everything that’s happened in the last 100 years! Why, only rerently the papers carried a notice that an obscure worker, Hans Wach, has invented a simple device to utilize exhaust steam on steam boats. Already, the report states, the steam ship lines have saved more than $15,000,000 in fuel bills with his invention. Almost ia the same breath the Dept. of Commerce announces that it will soon test out a new non-crashabie aeroplane, which the average man can learn to fly in a day, which will travel at 110 miles an hour and sell at the price of a cheap automobile. An unknown Seattle man has invented a robot to go 5,000 feet under the sea and recover millions and millions of dellars worth of gold lying at the bottom of the ocean since the days of the early Spaniards. Who Are Inventors? You'd be amazed at the men we con- tact in the course of a busy year. Can You Answer These Questions? Ask yourself these questions: the Patent Laws protect me? Remember this: For every outstanding big inven- tion there are thousa7ds of small, simple things for use in the home, the office, the factory, on the farm, on every sort of travel conveyance. Little articles like you find on the counters of a 10-cent store, hardware store, drug store, toy and novelty shop. Many Little Ideas Have Big Commercial Possibilities A person finds something he’s using doesn’t work right, or it’s clumsy, or costs too much. He gets a happy thought. He improves the old Article. That’s contribution to human progress. Thats the way that many, many men have reached the goal of financial comfort, independence and even wealth, Most of the things millions of us use didn’t come from the brains of engineers and physicists, They came from the mind and maybe the crude home work bench of Mr. Average Man, busily engaged in earning his bread and butter at what- ever chance or circumstance has given him to do. The “little” man’s opportunity as an inventor was never greater than it is today. Our Business Is To Help You. Write Us Today How do For more than thirty-six years, this firm What easy has been helping men with an inventive turn Most of them do not consider themselves inventors at all. During their work or leisure they get an idea. They work it out on paper. They get in touch with us about Protection. , Did you know that a dentist invented the stock ticker, a school teacher the telephone, a farmer the typewriter, an artist the telegraph? Did you know that ‘the crinkly hair pin—sold by millions now—came about because a husband saw his wife twisting the old-fashioned straight hair pin to make it stay in place? Poor men who have no thought of invention now will be financially well-fixed in a few years because of a happy thought that the world could use to advantage. steps can 1 take, without cost, to put myself in position to support my belief that I am the first man to think of my invention? Is a Patent worth the cost? Do I need a model? Should I try to sell my invention befare I have it Patented? Is there any safe, business-like way to secure financial help? Jf I do apply for a Patent how shall I reach people who can market my invention? Can I protect and sell an improvement on some invention that has already been patented? These are but a few of the questions which usually confront the average man. You need the answers! you CAN HAVE THEM, without cost, trouble, or delay. Copyright 1936 Victor J. Evans & Co. RUSH COUPON TO WASHINGTON. D of mind. We maintain a large staff of trained, experienced specialists—Registered Patent Attorneys, Draftsmen, and Searchers to help our clients secure all the protection to which they are entitled. Fees are reasonable. De- ferred payments frequently arranged. Ques- tions promptly answered. Write us frankly with absolute assurance that what you say will be treated with strictest secrecy. But FIRST, send for the FREE BOOKS shawn on the op- posite page. They are filled with facts, pic- tures and suggestions. They tell you things about Patents, Inventions and Selling Inven- tions that we have learned in our long experience. They may save you time, expense, EVEN LATER DISAPPOINTMENT. Simply fill in the coupon. No charge, no obligation. Write us today. 6 Thank You for Mentioning Modern Mechaniz Hobbies and Inventions When Writing to Advertisers

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man talk about - SELLING INVENTIONS d|] 115 Mechanical Move- ments Like These : fa REE WSW x : SS P ; i : Besides many other features and facts there are 115 differ- ent mechanical movements and principles in the big, 48-page Book below. Maybe there is just the idea you need to solve some mechanical problem. Use B B PAG E 5 the coupon or write us a card or letter, of Facts. and Pictures! Ù SNAG SP REGISTERED PATENT ATTORNEYS, MAIN OFFICE: 720-H, VICTOR BUILDING, WASHINGTON, D. C. N, Woolworth Bldg., New York ° Monadnock Bldg., Chicago | -N, Empire Bldg., Pittsburgh 1010-N, Hobart Bldg., San Francisco 736-N, Security Bldg., Les Angeles Send me FREE copies of your books, “Patent Protection” and When and How to Sell an Jnvention.”” (Note; Same books supplied by any of branch offices Usted abore.) Name sessu inte Fieiadaye: Mudie E EE TEELE areas. | Street and Now... cece cece een ence ene an eee eneeeenn cess eeee City or Town Thank You for Mentioning Modern Mechanix Hobbies and Inveutions When Writing te Advertisers 7

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Theres Quicker, Bigger MONEY for YOU-in POULTRY Earn $1,000 to $2,500 a Year or Have a Business of Your Own! Whether you want a job at good pay or a highly profitable busincss ployment Dept willheloscugetonel | FREE Book Shows the Wayto Big Pay and BIG Profits Mail coupon below TODAY Ior my Big NEW FREE Book, "How to Raise Poultry for Profit.” My torty years of experience are yours. The Poultry Industry needs YOU. Youneed my book. Get jt—and get in line for the BIG Money that’s waiting for you in ULTRY. po Mail NOW for FREE Gook NATIONAL POULTRY INSTITUTE, Dept. 139-A Adams Center, N. Y., Harry M. Lamon, Pres. Dear Mr. Lamon: Send me your FREE Book, “How to Ratse Poultry for Profit.” I want to know more about m oppor- tunity to make $1,000 to $2,500 a year, spare or full time. Spare qime or Full Time YOU N Cash-in BIG No matter where you live— city, town or country—or what you do now, my proved methods will assure your success right from the start, ra bai NOMG.cccusaceeneeedeea ee stanesnccnectesurnestabannaess : H AGÜTOSS. n sasernseseceraressercosissenonesss is krssrio ns : SAnNAUNNNNSNONEVANNAMEENENEEDEARNONNNDENGEUNENNRNANSEREEERDINEEN NEW SCIENTIFIC WONDER, S Reog. U.S. Pat oF "si y’ BOYS BIG FUN: EAA epparently sce thru Clothes, Wood Stone, any abject. See Bones in Flesh. FREE PKG. radio picture “You'll Wke ’em.’? t pkg. NEW HAVEN, CONN. films, takes pictures without camera. with each 250 order. MARVEL MFG. C0. Dept. 86, | Radic ie Televi station. Get actual experience over our Tee evision Station W9XALand commercial station WOXBY. Write today for free folder and literature showing actual rd photos of Television broadcasting, opportunities, etc. : FIRST NATIONAL TELEVISION, INC. Dent. G-7, Power & Light Bldg., Kansas City, Mo. WHY NOT GET A GOVERNMENT JOB? Pleasant and dignified and important work. Short hours. High starting salaries. Immigrant Inspector, $2100; File Clerk, $1440; Railway Postal Clerk, $1850; City Mail Carrier, $1700; Post Office Clerk, ’$1700; "Store- keeper-Gauger, $2000; General Clerk, $1560; Inspector Open to U, S. Citizens be- No education necessary. of Customs, $2100 a year. tween the ages of 18 and 50. Write us a note asking us to mail you our FREE Bulletin of Information. This bulletin tells all about Government jobs, and how to get one. Send for this bulletin now! CITIZENS{TRAINING AND INFORMING BUREAU Box 365 Mount Vernon, New York CONTENTS—Continued from page 4 Architect Builds New Home In Glass - - 87 Making the World’s Largest Photographs 89 HOW-TO-BUILD FEATURES “Sunbeam”—a Flashing Model Raceboat = 90 A Home Air Conditioner You Can Make - 95 Surfboards For Summer Sport - - =- =- 99 Build “Handy Henry” Tractor For Twenty Dollars - - - =- - =~ = =- -= « = Tips For Motorcyclists - - - - = > = “Crystaldyne” A Cigar Box Receiver =- = A Novel Sword and Shield Sundial - - =- A Treadle Operated Swing For The Lawn -= Paint Wisely and Save Money - - - = = Making Novelty Jewelry At Home =- = = 100 103 106 107 109 110 113 NEW MECHANICAL INVENTIONS Scrap Iron Pays For Political Race - = - 30 Radio Waves Piped In Tube - - - - - 31 Flying Wings Is Model For Liner - - - 31 Camera Takes 5,000 Pictures A Minute - 35 Flicker Bulb Is Self-contained - - - - 35 Amphibian Sets Two Altitude Marks - - 39 Small Arc Welder Handles Big Jobs - - 39 “Whippet” Boats Guard Europe’s Seas - - 44 Modern School Built Of Glass Bricks - - 44 Motor Truck Delivers Rail Shipments - - 49 Radio Station Built In Top Hat - - - - 49 New Bus Features Aluminum Body - - 49 Electric Eye Judges Races - - - - - 52 Tickets Printed On Midget Press- - - - 52 Robot Synchronizes Plane Motors - - - 52 Rocket Blast Launches Lifeboat - - - - 58 Sootless Cook Stove Burns Sawdust - - - 58 “Family Bus” Carries 11 Passengers - - 58 Plane Claimed Cleanest In Design - - - 62 Canoe, Bicycle Fold For Traveling - - - 62 Giro Plane Flies Without Propeller - - - 63 Athlete Invents Novel Land Canoe - - - 63 Light Beams Boon To Aviation - - - - 67 Robot Develops Film Uniformly - - - - 67 Radio Listens In On Phone Calls - - - - 67 Sound Truck Records Street Comments - - 71 Eye-Glasses Double For Microscope ~ - 71 Camera Boasts Fast, Adjustable Lens - - 72 Electric Iron Sprinkles Clothes - - - ‘- 72 French Car Boasts Automatic Top - - - 76 Machine Heats Or Cools Sky Liners - - 76 Flexible Axle Truck Rolls Over Rough Roads 77 Odd Motorcycle Puzzles Parisians - - TI Huge Spray Used To Color Pottery - - 77 Bicycle Without Pedals Gains Public Fancy 78 Machine Makes Issuing Checks Easy - - 78 German Mail Bus Placed In Service - - - 78 Minnesota Bridge Has Circular Ramp - - 82 Fire Ladder Rises 164 Feet - - - - - 82 Mystery Plane Aims At New Record - - 86 Lathe Combines Beauty With Utility - - 86 [Continued on page 12] 8 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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OWN A COMPLETE SHOP At the Cost of One Finished Machine Everyone wants additional tools for his shop. High cost pat- terns made this impossible in the past. NOW there is a New Deal for the hobbyist. We have engineered the most needed tools and are offering castings and blueprints of them. No chance of mistakes because all detail drawings are half or full scale. Every item designed for complete and trouble-proof construction in school or home. You can build them for your own shop or for re-sale at attractive profits. NO WORRIES ABOUT QUALITY Quality and design of our castings are so perfect that your first order will make you a life-long customer. Only perfectly- designed castings are good enough for you — and for us. When you order, you know that you will get materials worthy of your skill and time. To maintain our leadership we must continue to sell only the best. We are absolutely pledged to this policy. MAKE YOUR SHOP PAY DIVIDENDS Why not let your shop pay for itself and then earn a profit? A year ago one customer had only a small lathe and drill. Now he has a shop full of machinery valued at $4000. He did it by selling finished machines built from our castings. Now read the descriptions of six especially useful tools: Shaper: $42 buys castings for this exceptionally efficient bench shaper. 10” stroke; 10” long. feed; 7” vertical feed. Requires '/;-hp. motor. Truly a marvelous opportunity to purchase a ou machine at less than 1/10 of its assembled value. Machine Vise —7”, swivel base, semi- steel, heavy design. Although a very easy tool to build, this vise has a place in every shop. You save over $16.00 By build- ing it in 7 or 8 hours of your spare time. Castings and materials. . . e. 295 Bench Vise — 4”. No shop is complete without a vise. Why spend $10.00 or more? Castings and material, including Milling Machine: $29.50 buys castings and materials. 12” long. feed; 5” traverse feed: 8” vertical feed. Requires Va-hp. motor. | your equipment is limited, you can buy this mill semi-machined, with all major machin- ing already done . . . including facing, boring, dovetailing, slotting, and T-slotting. You can easily complete the job with 6” lathe and drill. Write for further informa- tion and prices, bronze nut, only $4.80. Can be finished in three or four hours. Drill Press—Bench Size. Truly a well de- signed drill. Motor mount on head, tilt table, ''V" belt drive, pulley rides on head casting, consequently no spindle torque. By machining and finishing this drill yourself you will save about $24, 0. Castings and Prints only . . . . $6.25 Wood Shaper—l4”, This beautiful, ball bearing, high speed spindle shaper is a particularly fine project as it can be ma- chined on only a lathe and drill. Has heavy table, combination guide and guard, adjustable collar to regulate depth of cut, and two large ball bear- ings. You save nearly $20.00 by building this yourself. Castings and Prints . $7.50 following units: O Bench Milling Machine 10” Metal Shaper D Dividing Centers O 7” Machine Vise O 4” Bench Vise mi mi o Bench Drill Press Floor Drill Press 4” Bench Grinder é” Bench Grinder 14” Wood Shaper 0O 8” Circular Saw Complete portfolio of blueprints postpaid for y single blue- print 10c. Low freight rates on castings to all points in U.S. Con- sulting engineering service free to our customers. Ef you want to sell finished tools, we give actual sales help and proven methods. Get in ahead of the crowd. Order your blueprints today. ooo Band Saw—This large al! cast iron saw will be greatly valued by the wood hob- byist, carpenter, or pattern maker. As drilling and filing is the only machine work done on the frame, this project can be built in any shop able to machine the smaller castings. Has tilt table, auxiliary table, gales blade tension tightener and ball bearings. You save over $50.00 by building this saw for your own use. Castings . 1... ee e+ $15.45 Airplane Engine — 4” Bore. 6500 RPM, |/5-hp. This project will appeal to thou- sands. To facilitate finishing we have made this design as sirnple yet as prac- tical as possible. EASY TO MAKE! Long fast flights! Excellent experience! Cast- ings and steel . . a. s e, a $3.45 BLUEPRINT PORTFOLIO FOR $1 You can see how easy it is to build these machines — and how good they are — when you buy our complete blueprint portfolio, 18” x 13⁄2”, showing the O 16” 2-Wheel Band Saw O 24” 3-Wheel Band Saw D 6” Jointer C] Model Steam Engines O 7%” Bore 2-Cycle Airplane Engine COMPLETE PORTFOLIO LEWIS MACHINE TOOL CASTINGS ASSEMBLY DRAWING. BLUE PRINTS LEWIS MACHINE, TOOL CO. Furre 37 SAM MARGO CAn LEWIS MACHINE TOOL CO. 542 Fifth Street San Francisco, Calif. Thank You for Mentioning Modern Mechanix Hobbics and Inventions When Writing to Advertisers 9

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DELAYS ARE DANGEROUS IN The Free Book shown here PATENT MATTERS was prepared for inventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for this book AT ONCE. It will tell you exactly how an application for a Patent is made, what informa- Small Ideas May Have Large Com- mercial Possibilities Ideas do not have to be complicated to be profitable when Patented. The 5c and 10c stores flourish on simple Pat- ented products which are commercially successful, The zipper, safety pin, thumb tack, paper clip, collar button— all are simple yet familiar inventions— brought their inventors rich rewards! If you have a Patentable idea—act to protect it. Send for our FREE 48-Page Book that tells you how A partial view of our draft- ing and specification offices ” where a large staff of ex perienced experts is in our } constant employ. g tion you must furnish your attorney, and what steps he must take in order to protect your interests. Remember, inventing an article is one thing—securing the exclusive right to manufacture it, use it or sell it is another. Without a U. S. Patent, you cannot expect to reap the profits that your invention may make possible. Send at once for this book. After you get that, you'll know exactly what to do to protect yourself. WE SERVE YOU QUICKLY and SECRETLY Anything you write us or send us is strictly confi- dential between us. All letters and drawings are kept in strong, steel, fireproof files, which are open only to ourselves or authorized members of our staff. We have secured patents for inventors located in every state in the Union. Our organization is a large and efficient one, Our practice is confined en- tirely to Patents, Trade-Marks and Copyrights. We have had vears of experience in Patent Matters. When you place your idea in our hands, we are in position to proceed at once to secure protection for you. Our fees are reasonable, and, if you desire, we can arrange convenient terms of payment. IMPORTANT! Please understand that you are not under the slightest obligation in sending for this book. We will mail it, together with the Record of Invention form, the same day we receive your request. Use the coupon on next page to save yourself time and trouble. After that, you will be in position to pro- ceed or not as you choose, to make your application for a patent. CLARENCE A. O’BRIEN & HYMAN 317-H Adams Building BERMAN Washington, D. C. REGISTERED PATENT ATTORNEYS BEFORE U. S. PATENT OFFICE Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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RECORD OF | INVENTION BLANK We will send you our Record of Invention form FREE. This blank will enable you to make a sketch of your idea in proper form and have it witnessed in such manner that it may be of value to you as evidence should the oceasion for evidence arise. In our book, we tell you how to use this form to protect your in- terests. YOU CAN PATENT NEW IDEAS FOR IMPROVE- MENTS IN MACHINERY, ARTICLES, DESIGNS, FORMULAS, ETC. Every year thousands of Patents are granted. Very few, however, represent the discovery of en- tirely new principles. Most of them provide new methods of doing some everyday thing in a better way—changes for greater efficiency, usefulness, adaptabil- ity, or beauty in some previously Patented thing. These IM- PROVEMENTS are Patentable if new, and actually represent new invention. These improve- ment Patents offer large chances for profit if commercially useful. The business world wants im- proved products and services. OUR LOCATIONIN WASHINGTON Our offices in Washington are convenient to the Patent Office, and we and our assistants can, therefore, appear promptly before the officials and Examiners, REASONABLE FEES AND CONVENIENT TERMS yee AND THIS BOOK TELLS HOW! How your Patent Application is made; what kind of sketches or drawings are necessary; what other papers must he made out; how the Patent Laws pro- tect you; why it is important to avoid loss of time in getting your applica- tion filed; and many other important points. Even a very simple idea, if new and useful, may prove very value able. You may have much to gain and nothing to lose by sending for this book DAY CLARENCE A.O BRIEN € Hyman Berman 317-H Adams Building WASHINGTON, D.C. REGISTERED PATENT ATTORNEYS EFORE U.S: PATENT OFFICE Please send me your FREE BOOK, "Patent Guide for the Inventor” and your “Record of Invention” form, without any cost or obligation on my part. We have served thousands of inventors in NAME sigystervcarntonrssiitinanccdiavnirassenernnided tira nt eer Beene all parts of the United States and we are able to serve you very reasonably and ex- ADDRESS icsancacsrsasnrsssnsainsabinnseniiutessnaroneranananonianennciaamnsaneadden sented bonamieneenanes tend liberal terms of payment. So den’t Waste valuable time; ~~~ sd. E E Sinica cuss A A E I E A C L L L n atant: Write or print name plainly.) ——! Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 11

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" REDUCED ~v WAIST __ 8 INCHES” greatvalue andI Admona. (ad Why Don't YOU Testthe WeilBeltat Our Expense? You will appear many inches slimmer at once and in ten short days your waist line will actually be 3 inches smaller... 3 inches of fat gone or no cost! Massage-Like Action Does It! You wili be completely comfortable as the ma:s- Sage-like action gently but persistently ellmi- nates fat with every movel Gives erect, athletic carriage . . e supports abdominal walls .. . keeps digestive organs in place . . . greatly increases your endurance, Experlences uf thousands of men justify us in making you this unqualified agreement: REDUCE your WAIST 3 INCHES in 10 DAYS. . or no cost! Slmply write name and address on postcard and we will send you illustrated folder and full details of our 10 DAY FREE TRIAL OFFER. THE WEIL COMPANY , 397 HINISI., New Haven, Conn. xa Bees pe ms 00 i ©) Young Man! Aviation now offers you a most attractive opportunity for a brilliant career. The aviation industry is having the greatest increase of business in its history. This means thousands of good pay jobs for service men, mechanics and pilots with proper training such as we give you at this Lincoln School. GOVERNMENT PILOT'S LICENSE—Uincoln Approved Flying School training includes everything to make you a first elass PHa Iere you train for Government License as Transport, Limlted Commercial, Private or Amateur Pllot. You learn straight fiyln night Ayling, hilnd flying by instrument, radio beam fiylng, c country tiying, acrobatics, spot landing, aerial navigation. GOVERNMENT MECHANIC'S LICENSE—Lincoln Approved Mechanics School training is all-complete, giving you every re- quirement for Government License as Airplane and Engine cuunic, You rebulld modern airplanes and engines under fa standards, TvalnIng also ineludes aerial radio, welding, instr repair, machine shop practice and Sheet Metal Work, GOVERNMENT APPROVED SCHOOL—Both the Lincoln Flight and Mechanies Schools ure under Government Supervision. Our fleet of training planes includes high and low wing monoplanes, open cockpit biplanes, small and large type cabin planes, all in- spected and approved by the U. S. Dept, of Commerce, Modern building, thoroughly equipped. $100,000 Lindbergh Airport. Ligh class Government Licensed instructors. GOOD JOBS AHEAD—Lincoln graduates in demand. Many em- ployed by leading airlines, factories, airports and service stations. Through our acqualntance and eon- Be taet with the industry, we recom- mend our graduates for positions as pilots and mechanics, Get all YOUR UNCOLN TRAINING |, WON THE PLACE — the facts. WRITE NOW. Please FOR YOU stato your age. LINCOLN AIRPLANE & FLYING SCHOOL 401F Aircraft Bldg., Lincoln, Nebr. CONTENTS—Continued from page 8 New Rod and Grip Aid Fisherman - - - 86 Small Porcelain Base Supports Radio Tower 88 Automatic Glass Washer Patented - - - 88 Robot Listeners Check Broadcasts - - - 88 Dash Lamp Warns of Light Failure - - - 88 INTERESTING SCIENTIFIC ITEMS Capt. Eyston Sets Racing Record - - - 35 Giant Cameras To Photograph Sun’s Eclipse 39 Diamond Cut To Make $2,000,000 Necklace Chef Fashions Caricatures In Toast - - - 62 Device Measures Body Heat Of Bees - - 63 Big Tank Floated To New Location - Film To Record Perfect Voice Pattern - - 72 Garden Thrives On Chemical Soil - - - 76 New Process Turns Out Clean Dirt - FOR THE WORKSHOP FAN Short Cuts For The Shop Man - - - - $4 1 > is I i al m 1 L co N Attractive Lamp Turned From Plywood - 98 A Stamp Projector For Hobbyists - - - 98 Summer Suggestions For Motorists - - - 102 Moisture Gauge Measures Humidity - - 104 Jumping Plug Puzzles Party Guests - - - 104 Helpful Tips For Fishermen - - - - - 108 Ideas For Use About The Home - - - - 112 Combination Door Adds To Home Convenience - - - - - ~- - - = 114 Fruit Jar Makes Decorative Lantern - - 114 DEPARTMENTS Solving The Readers Problems - - - - 14 Random Chips From The Editor’s Workbench - - - - - - =- - - - 2 Nic Sprank - - - - - - - -~ - 34 Sportsman’s Campfire - - - - - - - 74 Radio Sparks - - - - - ~- - - - -~ 105 Camera Puzzlers - - - - - - - - - 116 New Business Ideas - - - - - ~ - 14 Published monthly by Modern Mechanix Publishing Co. at Broadway and 11th St, Loutsville, Ky., U. S. A. Al remittances and co spondence concerning subser as well as notifications of ehange of address, showld be addr d to the general offices, Modern Mechanix Publishing Co., 22 West Putnam Ave., Greenwich, Conn, ‘Address all manuscripts to Modern Mechanix Jlobbies & Jnven- tions, 22 West Putnam Ave., Greenwich, Conn, Entered as second- class matter under the act of March 3, 1879, at the post offiee in Louisville, Ky., with additional entry at Greenwich, Conn. Copyright 1936. Editorial offices: Fawcett Building, Greenwich, Conn. Not responsible for unsolicited manuseripts. Contributions accompanie hy insufficient postage will not be returned. In U. S. E slons and in Canada, 15¢ a copy; $1.50 a year. Other Postal Unlons, $2.00 a year. Printed in U. 8. A. Advertising terms close the first of second month preceding date of issue. Advertising offlees: York, 1501 Broadway; Chicago, 360 N. Michigan Ave.; San Fran- oti cisco, Simpson-Reilly, 1014 Russ Blde.; Los Ang , Shipson- Reilly, 536 S. Till Si. General business offices, Faweett Building, Greenwich, Conn. Member Audit Bureau of Circulations William Kostka A. Neely Halt Editor Workshop Expert . Robert Page Lincoln S. S. Rabi Hunting and Fishing Editor Naval Architect 12 Thank You for Mentioning Modern Mechanix Hobbies aud Inventions When Writing to Advertisers

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Is Your Job Safe Just as the gasoline engine changed or wiped out the jobs of thousands who depended on horse-drawn vehicles for their living—just as electricity changed the entire set-up in the fields of light and power —so now the Diesel engine is fast invading both the power and transportation fields, and threatening the present jobs of thousands of workers, Ifjobs in your line are steadi- ly growing scarcer, you owe it to yourself to investigate this new, progressive, uncrowded À line, that will offer good open- a ings for many years to come. Diesel—The Newest, Fastest-Growing Power i 1 em 5 H H . Nowis your chance t t into a big new industry and grow up with Diesel engines because of their high efficiency, de it to eit ortant postion. Today there is practically no Sati. pendability, and economy of operation—are fast replac- tion in the Diescl field, but the increasing use of Dicsel engines will ing steam and gasoline engines in power plants, motor trucksand result in keen competition for jobs in the near future. By starting busses, locomotives and ships, aircraft, tractors, dredges, your training now, you can kcep ahead of such competition. drills, pumps, ete- opening up an increasing number of well- What This New Field Offers You paid jobs tor Diesel-trained men. e held o 1ese: ngineer- H i A ìng is on the upgrade and continually expanding. It will pro- Get our Free Diesel Booklet and learn all about this newest fastest- i line—its opportunities and requirements. Find out vide steady employment and advancement for those properly {astest growing pp S 2 : what the Diesel field offers you—how rapidly the Diesel industry fj trained in this new industry—as long as they need to work. has developed during the fast three years—the large number of You get complete information on all the latest Diesel de- Diesel engines and accessories being manufactured today—how quickly F i i f Dicsel engine principles velopments—two- and four-stroke cycles; low- and high-speed You can obtain a complete understanding o i 2 r i d S 5 by l tudy during your spare time—without inter- and heavy-duty types; Diesel-electric generating systems, etc. pnd operation by Pome study during y ER : —in our course. Includes all text material—with special dia- Asking for information involves no obligation — but it may mark grams for quick understanding of this new power. the turning point in your life. Write TODAY for full information. American School, Dept.DB-28, Drexel Avenue at 58th Street, Chicago, Illinois _Turn Your Spare Time into Dollars BUILD YOUR OWN | Norr EÀ slow speed wind charger from old Out automobile generator. We show you CIGAR LIGHTER how. Make money building for others, This New scientific marvel amazes everyone. Packed Light your buildings and play radio. | LOGICAL SUCCESSOR TO THE TLINT¢ He ye Dime brings complete plans and Jgnition principle, Every demonstration a ou! catalog. Twenty other generator | SiG; muer mikine salos plan 250.) Gold Display Boxes changes. Satisfaction guaranteed. | Hire" O Tt ue Bhs ies, Sous EE LeJay Manufacturing Co., 1414 W. Lake St., Minneapolis, Minn. NEW METHOD MFG. CO. Sanii a25 New Method Bidg. Bradford, Pa. *— äi Box M-43 BACK YARD Pair of breeders lay 10,000 eggs yearly! Frogs sell up to $5.00 per dozen. WE BUY! . MARKET WAITING. Any climate suitable. No experience necessary, Shallow pond starts you. NufondGiants Write today for complete, il- Weighup3tbs. lustrated literature and FREE FROG BOOK! =" AMERICAN FROG CANNING CO.Dept.119 -K NewOrleans,La: Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 13

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M M EDITORS ANSWER Perplexing READER PROBLEMS CHINOOK CYLINDER WALL THICKNESS “Chinook,” the model gasoline engine described in the May issue of MM was one of the most interesting projects to appear in its pages. Since I hope to build “Chinook” shortly I would appre- ciate knowing the thickness of the cylinder walls.— J. G., Wheeling, W. Va. In constructing the cylinder make the walls one-sixteenth of one inch thick. “Chinook” blueprints are now available through the MM Blueprint Dept. at 50c postpaid. COUPLING TRAILER TO THE AUTO I recently purchased a 1936 model automobile and find that it is impossible to connect my trailer to the car’s bumper as I did with my traded-in car. Can you advise a satisfactory method for coupling the trailer?—T. A. L., Washington, D. C. At no time should a trailer be attached to a makeshift coupling device on the rear bumper of a car. Such an arrangement is not only dangerous but poor practice. A commercial trailer hook, similar to those advertised in MM from time to time, is re- quired. A coupling of this type connects directly to the frame of the car. Due to the low cost of good couplers it is inadvisable to attempt to make your own. In attaching a trailer to your car chains should also be used as a safety measure. INCREASING LIFE OF ELASTIC MOTOR The rubber band motor which drives my three- foot model plane is constantly breaking. At first I thought this was due to stale rubber, but find that new rubber is no better. Can the rubber motor be lubricated with some solution so as to increase the life of the elastic?—E. J. L., Dallas, Texas. The continued breaking of rubber bands used to power your model plane may be traced to the propeller shaft hook or the hook in the tail of the plane to which the elastic 14 is attached. Small gauge piano wire is usually used for this purpose and the sharp edges cut the cord. By slipping short lengths of rubber tubing over these hooks and lubri- cating the elastic with glycerine the life of the rubber band motor will be increased greatly. GENERATOR FAILS TO CHARGE PROPERLY I have noticed that while driving my car the battery does not receive a uniform charging rate. Sometimes the rate is five amperes while at other times it is ten. Since I do quite a bit of night driving the battery has little chance to secure a sufficient charge. Many of my friends have ex- perienced similar trouble. Are you in a position to suggest a method for correcting this trouble?— E. R., Omaha, Nebr. If your generator does not produce a uni- form charge it is due to'a faulty cut-out or worn brushes. Replace the old brushes with new ones then clean the commutator with gasoline. Carefully check the cut-out for stuck contact points and replace this unit if necessary. If the generator charging rate is too low it can be increased by advancing the position of the variable brush on the commutator. USING MIDGET A. C. SET IN AUTO I have a 4-tube midget electric radio and I should very much like to use it in my car. Isn’t it possible for me to connect a B unit to it and get satisfactory results?——G. R. M., Waterbury, Conn. To use a set of this kind in your auto will require the filament circuit being rewired. Since motor ignition noises will be present the set will also have to be thoroughly shielded. Most midget sets have only three active tubes which is insufficient for auto use. We don’t advise the change. A LUBRICANT FOR AUTOMOBILE SQUEAKS My car has developed squeaks in several places and while the regular pressure lubrication does silence the noise for a few days its effect is by no [Continued on page 16]

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You'd STICK HOME, TOO IF YOUR FACE HAD GONE SOUR DON'T SEE WHY YOLIRE SO STANDO- OFFISH. NAN‘S w FRIEND'S A PEACH Ff YouD LIKE HEeR~ F JOE GIVES ME A PAIN..WON'T P| IS THAT WHATS 5 GO ANYWHERE JUST BECAUSE] WRONG P WHY, THE HE'S GOT A BATCH OF HICKIES y POOR BOY! BOB, YOU P QUGHT TO TELL HIM ENJOY GETTIN’ THE ABOUT FLEISCHMANNS ONCE- OVER IF YOUR FACE] WAS ALL BROKEN OUT LIKE MINE! THESE HICKIES LITILE JOSEPHS NOT ASHAMED OF BEING LOOKED AT ANY MORE -~ THANKS TO » FLEISCHMANNS YEAST SAY, JOE IF YOURE SO EX [ y/MEAN THAT... GEEL } UPSET ABOUT “THOSE PIMPLES, | | STOP AN’ GET SOME ON : WHY DONT YOU EAT / | THE WAY HOME! FLEISCHMANNS YEAST? : THEY SAY IT'S THE STUFF TO BUMPEM OFF LISTEN, VICKY. OLD JOE'S THIS NEXT SONGS} MAKIN’ UP FOR ESPECIALLY FOR | LOST TIME f YOV = Don’t let Adolescent Pimples make OUR iP ABOUT YOU want to shun your friends FLEISCHMANN'S YEAST CERTAINLY FIXED HIM UP! RE Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Pimples often occur after the start of adolescence, from about 13 to 25. At this time important glands develop. Final growth takes place. Disturbances occur in the body. The skin gets oversensi- į tive. Waste poisons in the blood irritate this sen- sitiveskin. Pimples appear! Fleischmann’s Yeast clears these skin irritants out of the blood. Pimples go!Eat 3 cakesdaily, before meals—plain, or in a little water—until skin clears. A clears lhe skin by clearing skin irritants out of the blood Copyright, 1936, Standard Brands Incorporated 15

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OBTAIN GOOD JOB and LASTING SUCCESS BY PROPER TRAINING Maybe you are employed but earning only a mere pittance with no chance to advance. Or perhaps you are one of the millions of the unemployed— anxious for work but unfortunate BECAUSE you are untrained! TRAIN AT NATIONAL SCHOOLS LOS ANGELES More than 30,000 graduates hare completed training at our institu- tion, becoming fully qualified for good jobs in the most active, best- paylng Trades, including: DIESEL ENGINEERING GAS ENGINEERING AUTO REPAIRING ELECTRICITY RADIO—TELEVISION BROADCASTING Caterpil Students receiving ine struction in radio transmission, If you are ambitious and determined to prepare for a FUTURE that will earn you thousands of dollars extra mail the coupon. during your life, Checking motor wind- ings in Electrical De- partment, « « IMPORTANT .. Students are allowed coach railroad fare to Los Angeles. We assist you to earn room and board while learning, NATIONAL SCHOOLS Dept. MM-7, 4000 S. Figueroa St.. Los Angeles 1 AM INTERESTED Send Details on Courses Checked O Electricity O Television D Radlo C Broadcasting 9 Talking Pictures Diesel Engineering Auto Repairing Machine Shop Batterles Garage Operation on000 Problems Editor Answers Queries [Continued from page 14] means permanent. Can you suggest a method for correcting this trouble?—L. T. N., Denver, Colo. On shackles and similar parts exposed to the elements the grease is rapidly dried yp and washed away when the car is driven during a rainy spell. The most effective way to correct stubborn squeaks is to apply stick graphite to the source of the noise. If pos- sible pins or bolts holding the shackle should be removed and the graphite rubbed on well. The graphite may also be applied to door hinges and other small moving parts where annoying squeaks develop. KILLING WEEDS IN WALKWAY We recently constructed a gravel walkway on our lawn and while a grass strip was removed before putting down the stones weeds continually shoot up through them. Can you recommend some common chemical which will kill this unwanted wild grass?—R. P., Portsmouth, Va. Wild grass or common weeds can be killed by applying a copper sulphate solution to the ground where the trouble exists. The copper sulphate, commonly known as “Bluestone” is dissolved in water, one pound to each gallon. It should be remembered that where the solution has been applied no vegetation will grow. METAL OR GLASS TUBES? My radio receiver is equipped with glass tubes and performs very well. Several of my friends have receivers which employ the new metal types. Are these tubes superior to those in my set?— E. M. M., Danville, Va. While there is no noticeable difference in the performance of the radio receiver using glass tubes and one using the metal types, the metal tube offers several mechanical advan- tages. Since the tube is a shield in itself the usual metal shields found on glass tube receivers are not necessary. The metal tube employs a uniform socket so that all tubes have an eight-prong base. A special pin in the center of the tube base permits the tube to be inserted into the socket in a fraction of the time required for the glass types. An- other advantage offered by the metal tube is that its electrical characteristics make it ideal for use in modern high gain receivers. (Editor's Note: Your questions will be answered per- sonally and free of charge by MM experts provided they do not require special research or involve trade secrets. Names and addresses of manufacturers of new products described in this issue can also be obtained free upon request. Enclose a self-addressed and stamped cnvelope for reply. Address: Problems Editor, Modern Afechanty Publishing Co., Greenwich, Conn.) 16 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers g

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BUILD Your Own AUTO TRAILER FURNITURE ICE BOATS MODELS ‘RADIOS BOATS SUSLISHED EY MONKAN, MERANIA PURLZHING COMPAR. The 1936 HOW to BUILD IT Tells You How The man or boy with a home shop hobby needs this valuable book, It contains com- plete drawings, photographs, and instruc- tions for building hundreds of projects with ordinary tools. Covers everything from tricks and kinks to dirt track racers. 50° AT YOUR NEWSSTAND OR ORDER FROM MODERN MECHANIX Publishing Company GREENWICH, CONN. from a clerk to CHIEF CONSULTANT ACCOUNTANT The interesting rise of J. H. Krouse . How he did it... And how the same chance is open to you. HE greatest decision I ever made,” writes H. Krouse of Memphis, Tennessee, “was when I decided to take your training in Higher Accountancy. At the time I enrolled I was a clerk. Today I am chief consultant ac- countant for the U. S. Engineers Office in Memphis, Tennessee. Whatever success or rec- ognition I have had I owetoyour training. Ihave had no other specialized training along this line. “Certainly the principles and methods of procedure in your training are so practical and analytical that any man of average intelli- gence can understand them. Your method of teaching is not only instructive but highly en- gaging. I have observed other courses but firmly believe LaSalle has the best to be had anywhere.” Mr. Krouse has not only profited personally from his training but the benefits have been passed on in the government service. Many of the Forms and Methods of Procedure in the government Cost t Keeping Manual, now in general use in all U ngineer districts, were developed by him. Mr. Krouse’s rise in the business world is typical of the thousands and thousands who have taken LaSalle training in Higher Ac- countancy. To date, more than 500,000 have benefited by this course. And more than 1,350 of America’s C. P. A.’s are LaSalle trained. LaSalle training is complete and specialized. Its teaching methods are unusual. All it re- quires from you is ambition, the will to work— and the willingness to exchange hours of play for years of success. Full particulars about this training will be sent you upon request. The coupon below is for your convenience. Don’t hesitate. Send it today. When you see the wealth of material presented—and how it will help you gratify your ambitions, you'll be mighty glad you did! LaSalle Extension University Dept. 7493-HR, Chicago, Ill. Td like to know more about the training which Mr. Krouse found so valuable. Please send me your free 64-page illustra- ted booklet, “Accountancy, the Profession That Pays.” Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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For Faster Better Jobs APPL P LLL LLL LIPS Master Craftsman’s Set 17 useful accessories to grind, drill, polish, rout, Model $18.50, with6 Ac- sand, saw, cut, engrave, cessorics. Catalog Free, carve, etc. $5.00 Postpaid CHICAGO WHEEL & MFG. CO., 106 S. Aberdeen St., Chicago THIS CHEMICAL HOLDS CREASE IN TROUSERS! Men! I've found it... a chemieal discovery that HOLDS the crease in your trousers. StayCrease added to pressing water puts a knife- like crease in your tr users that holds for an astonishing long time. StayCrease will make it easy to press ress at home and save those pressing bits. Will put a beautiful erease in your trousers that you and your friends will admire. Sure no bother keeping crease this easy way. Send now. 23c¢ brings you a year’s supply. H. A. LUKE, 6122 Fawcett Ave., IS YOUR CAR LOSING ITS POWER and SPEED? Don't spend time and money ‘overhauling motor, erinding valves, ete. Simply use ZOLENE, amazing new discovery. that removes carbon, reseats and eliminates sticking valves estores pep io sluggish motors—makes for quicker easier starting and cuts down on gas and oil bills. ZOLENE works automatically. Merely pour into cylinder, through spark plug openings. Enough for 8 cylinders 90e Postpaid. G. & M. PRODUCTS, 1283, Wis.

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É Clearly bring distant object close to your Easlly sec far away subjects magnified with this TESTED Super 40 Power elescope.. Look from your roof or out of your window and far away sights become as clear as if you were on the spot when focused with this trusty WINNEKSCOPE. See close-up of the moon, stars, ships, sport events, etc. Can also be used as a microscope for selen- tific observation. Have fun with far away neighbors. Look at what they are doing and phone and tell them about it. They will wonder how you know .. , makes objects miles away appear in front of you. A sclentifie achievement that defies competition. Durabl, made, brass bound, 4 powerful lenses, 1 foot long closed, about feet open. Made in U. S. A. SPECIAL FREE OFFER—Order at once! pocket telescope that closes to two inches. Fits the vest pocket? Great carry for emergency sights. Send No Money! Pay postman $2.43, plus postage, on arrival, or send $2.48 with order and get postage free. J. H. WINN MFG. CO., Dept. T-207, 124 W. 23 St., New York We will include a genuine

116 PROJECTS YOU CAN BUILD The 1936 Modern Mechanix Blueprint Booklet is America’s best index to how-to-build projects for the home shop. It contains nearly 70 illustrations and lists more than 116 blueprints. SCORES OF VALUABLE BOOKS FOR YOUR SHOP LIBRARY ARE LISTED IN THE 1936 Blueprint Catalog—FREE Send your name, address, and three-cent stamp to cover mailing cost for your copy to Modern Mechanix Publishing Company Fawcett Building Greenwich, Conn.

18 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Karlen AT the Indianapolis Clas- sic is to auto racing and the Kentucky Derby is to horse

Soap Box racers invade MM Boat fans show in-

ijt pron the second prize of $3 in our monthly Editor’s Workbench Contest. He writes: racing, so the Soap Box Derby genuity. Mid get car is to every youthful driver who byilders report success : San Carlos, Cat, has ever pil * Dear Editor: piloted a four-wheeled : : : 7 : ush-mobile do the biggest Editor issues call for pho- I am sending you a picture of the pl < p gs h Di kyack my friend and myself built. hill in the neighborhood. These tographs. Istant coun- We had great fun building it from free-wheeling chariots have got a certain zip and dash to them that none of the big cars seem to-have, and for that reason the Soap Box Derby is fast becoming a national institution, just like the Classic and the Derby. Now that vacation time is here again, it seems that most of the boys in the country are out building their racing soap boxes or hunting for plans to go by. MM is on hand to co-operate with all the builders. Not only are we running a big feature in this issue on all the mechanical details which go into a racer, but we are giving away two complete Soap Box racers and a set of balloon tired wheels as prizes in a new contest. You will find the details on Page 54. sokk This brings us right up to our own workbench contest. This time the first prize of $5 goes to Don Weisbard of Hollywood, Cal. Don decided to use the experience he had gained as a soap box engineer to build a midget automobile. That he was successful can be judged from the photo which appears on this page. His letter follows: Hollywood, Cal. Dear Editor: Enclosed herewith is a photo of a midget car powered with a one-lung, two-cycle motorcycle engine. I built it myself from scrap materials. It has a five foot wheel base, is seven feet long and thirty inches high. It has a low and high gear, a plate clutch and chain drive. She will do about 38 miles per hour when wide open. I found that aluminum disk wheels were necessary in the rear as the spoke wheels can’t take it when the power is applied. The spoke wheels work fine, however, in front. The little model next to it (in the photograph) is de- signed from a midget auto racer and is only ten inches long. It has an all-metal body, dummy engine, steering device, etc. I expect to have it chromium plated. Don Weisbard. oik Our boat building fans were present in even increasing numbers this month. One of them, Ed Olson of San Carlos, Cal, walked off with 20 tries are heard from. plans we found in the first edition of “How To Build 20 Boats.” Alter a great deal of thought and study, the plans were changed to hold two people instead of one. It has carried 340 pounds easily. I do not dislike any article in good old MM. Ed Olson. We have some good news for many of our readers in regard to our first edition of How To Build 20 Boats. After turning down orders right and left for nearly a year because we thought the edition was out of stock, Jimmie, the stock boy, reports that he found about 200 copies while moving the MM files to new quarters. You can get your copy of the first edition of How To Build 20 Boats now, if you hurry, by sending fifty cents to this office. The second edition is also in stock. Be sure to specify which edition you want. a8 aca One of our Paragraph Oddities in a recent issue concerning the custom of driving to right or left in Austria brought an interesting letter from one of our British readers. He has driven all over Europe and he says, quoting parts of his letter:

As neat a job as we have seen in this office for some time is this midget racer built by Don Weisbard. Note the model beside it. Don wins the first prize of $5 for this month. Modern Mechanix Hobbies &

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Eggar’s Hill, Aldershot, England Dear Editor: Having read the paragraph in a recent edition of your excellent magazine, I thought I might be able to enumerate a few other points of interest about driving an automobile in Europe. Most countries in Europe have their own special laws, confusing to the foreigner, For instance, in Czecho-Slovakia it is an offense to smoke while driv- ing. In Germany one must not carry any red lights on the car. Thus most of the tail lamps are orange. On the mountain roads in Switzerland some of the roads are very steep and narrow. A one-way traffic system is in operation, cars going up at one time, and down at another. Mail trucks ure painted yellow, andl the motorist must always pass these trucks on the precipice side of the road so that whatever may befall, it will not be the mail truck which goes over the cliff. In France the small villages have open drainage systems carried across the main road by a trench about two feet wide and one foot Clio Workbench deep. These ditches are very dangerous, being quite invisible in the cobbled streets. In Yugo-Slavia cars are very rare and there are few roads, Needless to say there are no garages and petrol is bought at the local chemists for about a dollar a gallon. In Monaco, the small state containing Monte Carlo, one’s speed must never exceed 9 miles per hour under normal circumstances, and a walking pace in dangerous places. Failure to comply often entails confiscation of one’s automobile. In Holland heavy motorcars must have a deep noted horn, and a light car or motorcycle a high pitched one. I hope these points may be of in- terest to you. Arthur Garratt. ate ie a The third prize of $2 this month goes to Gordon Chris- tiansen for his boy-powered steam shovel. Here is what he says about it: Ryder, N. Dak. Dear Editor: I am enclosing a snapshot of the boy-powered steam shovel built from plans in the April, 1935, issue of MM. (Also included in the 1936 “How To Build It’? Book). I built it as a present for my brother. It is surprising how well it works. The things it can do far exceed what I expected of it. The articles I least enjoy in MM are magic tricks for the amateur, but as a whole I like most all of the articles. I miss one page that used to be in the magazine called “Auto Generator Kinks.” Long live MM Magazine. I think it is a great book: Gordon Christiansen. Right now we want to regis- ter a complaint against you. This boy-powered scoop shovel, built from MM plans as, a present for his brother, wins for Gordon Christiansen the third prize of $2. photos, few of them are clear enough for publica- tion. If you want to win prizes in the Workbench’s monthly contest, take a little time to get good photographs of the things you are building. Don't shoot snaps of the project itself. Put yourself in the picture or let a friend pose for you. We need pictures but they must be good pictures. And don’t forget one of the requirements of each month’s contest is, you must state which article or department you liked best, and which least. ak oe Another midget car builder writes in to say: Mauch Chunk, Pa. Dear Editor: I have just built a midget car during my spare time. She does the one-fifth mile in 12 seconds and holds the road like a Cord. She is a front-drive 4-wheel brake job driven by a motorcycle engine. Makes thirty miles to the gallon and weighs 1,150 pounds. Uses 20x4 tires mounted on 12-inch wire wheels. Quali- fies under all midget racing classifica- tions. I will answer any questions con- cerning car if readers will ask me. William Miller. aie ae Here is a letter from a fan who believes in putting his workshop and MM to work. He makes it a point to keep all his MM copies on file where they can be located as needed. That it is a good policy Yes, you—the reader! You are too modest. While you are all willing to send us all kinds of Inventions, July, 1936 Here is an enlarged version of MM’s kyack plans. It was built for two Passengers instead of one by Ed. Olson. He wins the second prize of $3 in the monthly Workbench contest. you all will agree when you read his letter. [Continued on page 22] 21

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REE—if you act now—Kushlan’s HANDBOOK OF INDUSTRIAL ELECTRICITY ith the Regular McGraw-Hill 500-page =e manual of practical information for those engage in electrical con- Croft Library structlon, malntenance, testing, In- š spection and contracting. Yours of Practical without charge on receipt of your first payment for the Croft Library. ELECTRI CITY The Croft Library is a complete on practice- —on 20 years of ennt sleeve expericnce—on work as It is actua one. s jammed from cover to cover with the kind of Nard-headod facts you want. Written so that the beginner can easily understand it, yet so sound, so thorough that it is the daily guide of 59,000 highly paid electrical workers and electrical educator. It 1s founded engineers. Croft tells you the things you need to know about motors, generators armatures, commutators, transformers’? elreuits, switch- cards, distribution systems—electrical machinery of every type wiring for light and power—wwiring of finished buildings—underwriters’ and municipal requirements—illumination in its every phase—the most improved methods of lighting—lamps and lamp effects, etc.—how to do a complete job, from estimating It, to completion. No money down—easy payments Fill In and mall the coupon attached and we will send you the entire Set of seven volumes for ten days’ Free Examination. We take all the risk—you assume no obligation. If you decide to keep the books, send $1.50 in 10 days and the halance at the rate of $2.00 a month and get Kushlan’s nseful Handbook free, In addition, Send the coupon NOW and see the books for yourself. FREE EXAMINATION COUPON — a McGRAW-HILL BOOK CO., 330 W. 42nd St., New York Send me for ten days' free examination the Croft Library of Practical Electricity. If satisfactory I will send you $1.50 In 10 days and $2.00 monthly until the price of $19.50 is paid. If not wanted, I will return the books postpald. Upon receipt of my frst payment of $1.50 you are to send me a copy of Kushlan’s Handbook of Industrial Electricity, absolutely free. Name Home Address _._--------------------------.---- City and State as.c0=s-ssSeeeec essa te eee eee Position Name of Company INSTRUCTION BOOK “Harmonica Playing Made Easy.” The easiest and simplest Instruction Book ever prepared for the Harmonica. Tells you all about the different kinds of Harmonicas and how to play them. Explains how to organize Harmonica Bands. Send for your copy today—it’s FREE. Use coupon below. M. HOHNER, INC., 351 Fourth Ave., New York City | M. HOHNER, inc., Dept. 991G, J 35! Fourth Ave., New York City. ] Please send me your new Instruction Book, ] l TO soridin OERE TN aaaioo ERORE PETTA i l ATONE eor ninaiea eiA aa iE is aera REEN EENS l l city ........ PEEPI AA AE State ..........0.. J Address Canadian inquiries to J Hough & Kohler, Ltd., 468 King St. W., Toronto. Chips from the Editor’s Workbench [Continued from page 21] Cambridge, Mass. Dear Editor: While reading MM tonight I got up enough courage to write to you. That’s some- thing I’ve been mean- ing to do for the last four or five years that I have been reading your magazine, Inci- dentally, what I like most is Random Chips, Electrical Kinks, and Shop Kinks. There never are enough to suit me. Now I have made an electric power plant for the home, a trac- tor from an old car, and electric welder aan from a Dodge gen- erator, a saw bench for the shop, a blast furnace, a gas and air torch, an air com- pressor from a refrigerator unit, and oil burner for old crank- case oil, grinders, a press and so on. I could fill a page with things I have built from old MM. I keep my copies all stacked up in my Data Closet, and when I want to make something, I look up MM for the dope and I am very seldom disappointed. Edward LaCrosse of Iron River, Wisconsin, is the builder of this Moth class sailboat for racing. Louis Boutin. We would say that that is a pretty imposing list of completed projects as it stands now. zoko “I like best the Editor's Workbench,” Eltz from his home in Juniata, Nebr. see the things that others make. I also like any blueprints of models or full sized plans. Your magazine goes into such detail in the plans it is a pleasure to work from.” writes Clarence “I always like to Thanks for the bouquet. That is one thing we always insist upon, plenty of detail so that the experienced builder and the amateur alike can get right to work on one of our projects without having to spend half of their time trying to figure out the plans. EEF] Here is the answer to the question—“Why build a boat?” It comes from Kenneth Henshard of St. Paul, Minn. He writes— St. Paul, Minn. Dear Editor: I have just finished building Oriole. (A cabin cruiser from our second edition of How To Build 20 Boats). I am a cabinet maker by profession and I thought about all E would have to learn about boat building would be to learn the difference between a chine and a sheer. 1 learned the difference all right, and about a thousand other things that [Continued on page 24] 22 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Otherwise I will return them- No obligation unless I am satisfied, Namo ,,,ccccceocrssccccenecesccene Aeon esesecensace Peer eresev eres erernnacens Adale. coreneenccccccccsnecenes Moreen arena cera teens seen anveneeneneeterasene Occupations. .sssesscesecsers essseesssessa eeseesasosavpasossoseseseesoreenste, Reference Langa © IN 12 WEEKS | r 4012 BY SHOP WORK—NOT BY BOOKS A Finance Your Training! s irajniAg da in levi Sme te cat me ng Service. Many M al Sh earning. Waite, a a BI FIEREN 10 ani FELEVISION BOOK, and details of ‘ay “Pay-Tuitl lon-After-Graduation’’ H. C. LEWIS, President, COYNE RADIO SCHOOL 500 S. Paulina St., Dept. B6-1H, Chicago, Illinois HULL AUTO COMPASS Have you ever taken the wrong road and traveled many miles before discovering your Mistake? This new AIRPLANE TYPE COMPASS constantly tells your direction of travel. Sticks to windshield. Base 1%” diameter. ONLY $1.95, POSTPAID, in- cluding Compensator. SATISTACTION GUARANTEED, If your dealer cannot supply you, order direct, Box 246-A e eant OHIO HULL MFG. CO. Full size, heavy duty Aladdin Electric ARC WELDER only $29.50! Has effi- ciency of machines costing $145.00 and more. Does all types welding, uses all Kinds rods, welds all metals and alloys from heavy motor block and castings to fenders and light sheet metal. Fully guaranteed. WORKS FROM 110-V SOCKET. $iar'y,plug, inte it ov Volt light socket—costs only few pennies an hour to use. , Comes complete with goggles, welding rods, leads, tongs, etc. Nothing else to buy. Full Instructions Included, . AMAZING DETAILS FREE! Spite today for sen sational facts about Aladdin, Are Welder for $29.50! SEND NO > COMMONWEALTH MFG. CORP: - 3707 Madison, Dept. G-10, Cincinnati, O Chips from the Editor’s Workbench [Continued from page 22] A 1912 model single cylinder engine powers this unique air drive boat. Built by Norman E. Walker of Portage, Wis. Has a cruising speed of 7 m.p.h. Shallow water is no obstacle. I never knew such a small thing as a boat could hold. But it was fun, and if I can get as much enjoyment out of running Oriole as I did in building her, I'll have double my money’s worth, In my opinion a water tight boat is the highest form of cabinet making. When I am building a piece of furniture, T have to be pretty careful that all the joints fit tight, but it isn’t necessary that they are watertight. But on a boat every joint and seam must fit perfectly. Cabinet making may be a help when it comes to fitting out the cabin, but in building the hull, my brother, who just tinkers around my shop now and then, did just as good a job as I did. So I guess you are right when you say anybody can build a boat, Kenneth Henshard. whe It was a little early yet for any mail to reach us concerning Cruisemite, the trailer we published last month, but we know she’ll prove a winner. Let’s hear what you think about her. The way everything is starting out, it’s going to be a great summer, MO RANDOM CHIPS—William Brown of Youngs- town, O., says: “My midget auto, built from plans in your magazine, is equipped with a 3⁄4 horse power washing machine motor. The mileage is very high, about 50 miles to the gallon.” John M. Tucker of Albia, Iowa, also reports favorable results with a washing machine motor on his midget car. He says, “It has a pulley and chain drive and makes about 19 miles an hour. It is geared down to a ratio of 4 to 1.” Lester Rekonty, 346 W 14th St., Norfolk, Va., would like to get in touch with MM readers in foreign parts of the world. He says he would especially like to get in touch with stamp collectors. He ie With that we turn out the light over the work- bench and call it a day. Don’t forget the photos. We want more and better photos with a lot of human interest in them. 24 Thank You for Mentioning Modern Mechaniz Hobbies and Inventions When Writing to Advertisers

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Get your copy of this newest and finest of out- door books now, and make that next vacation a hundred times more enjoyable. In it are those important tricks of camping, fishing, hunting and hiking that prevent disappoint- ments and discomforts. Edited by ROBERT PAGE LINCOLN Hunting and Fishing Editor of Medern Mechanix & Inventions Magazine Filled with practical advice on every outdoor sport, written by leading experts in each field and edited by one of America’s foremost out- door writers PARTIAL CONTENTS FISHING Unfolding Mysteries of Fly Casting Spinner and Fly Kinks for Pan Fish How te Use Lures in Au- Fishing for Fresh Water Giants Choosing “Sure Shot” Casting Lures Bass and Trout Fishing Do’s and Don'ts Tackle for Ocean and Gulf Fishing How to Improve Your Trolling Selecting Bait for Winter Fishing Identifying the Fish You Catch HUNTING Talk Your Ducks Into the Bag Know the Fine Points of Duck Shooting Identifying Ducks Training Hunting Dogs Matching Wits with Pheasants Choosing a Gun for Upland Bird Shooting How to Get More Furs Bedding Down the Winter Hunter Preparing Hunting Camps Finding Your Way in the Woods Advantages of .22 Rifles in Hunting Start a Skeet Club CAMPING Camping Without Cooking Utensils Building a Semi-Log Cabin Selecting Your Motor Camping Tent Camp Cooking Tips How to Smoke Fish Simplifying Fish Cleaning Bagged Game — Care and Preservation BUILDING PLANS Collapsible Camping Traller “Skedaddle” — Simple Out- board Boat Duckboat Costs $10 16-Foot Canoe Light-Weight Boat Trailer and scores of other big fea- tures and kinks covering every phase of lifo in the out- doors. 148 Pages 593 Pictures 50° At Your Newsstand or Order Directly from MODERN MECHANIX PUB. CO. Fawcett Building Greenwich, Conn. DIESEL POWER A Coming American Industry The internal-combustion engine represents man’s su- preme triumph of machire power. Diesel engineers are in great demand. Many are acquiring necessary knowl- edge through spare-time study of this modem I. C.S. Course on Diesel engines. Free beokletl 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 Eringes the broader knowledge necessary for advance- ment. The coupon brings complete information. MECHANICAL ENGINEERING —A Field with a Future This course has meant advancement to hundreds of ambitious men, mechanics. draftsmen, blacksmiths, foundrymen, patternmakers, apprentices, and me- 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. Use the coupon] AUTOMOBILE EXPERTS are always in demand The rapid progress in manufacture end ~~, i, service of the modem automobile brings i a new opportunities to thousands of ambi- tious and forward-looking men. There's Gr e always a demand for trained men. Tho A new I.C.S. Automobile Course will make you a trained man! The time fo act is now. Use the coupon. ‘INTERNATIONAL CORRESPONDENCE SCHOOLS BOX 2320-H,SCRANTON, PENNA. Without obligation, send me full information on subject checked below: O DIESEL POWER O AUTOMOBILE COURSE ELECTRICAL ENGINEERING MECHANICAL ENGINEERING OO Architecture t Drafting — D Accounting Concrete Construction Good Enslish Reading Shop Blueprints OSalesmanshig OiCivil Engineering Advertising {Diesel Engines : (Show Card Lettering ClGas Engine Operating LiCivil Service C)Refrigeration (High School Subjects (Chemistry Air Conditioning (Highway Engineering Inventing and Patenting (Poultry Farming DAviation Engines Name Address Thank You for Meutioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 25

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a Queer Way to Learn Music! No teacher—no monotonous exercises or confusing details. Just a simple, easy, home-study method. Takes only a few minutes-— arerages only a few cents—a day. No "grind" or hard work, Every step is clear as crystal—simple as A-B-C throughout. You'll be surprised at your own rapid progress. From the start you are learn- ing real tunes by note, Quickly learn to play *jazz"' ov classical selections—right at home in your spare time, Free Book and Demonstration Lesson Pick Your Instrument Piano Violin Organ Clarinet Ukulele Flute Cornet Harp Trombone ’Gello Don't be a wallflower. Send for Free Tooklet and Free Demonstration Lesion. some Piecoto These explain our wonderful home study Banjo Accordion method fully and show you how ensily and quickly you can learn to play ot little ex- pense, Mention your favorite instrument. Write NOW. Instruments supplied when needed, cash or eredit. U. S. SCHOOL OF MUSIC 2627 Brunswick Bldg., New York City Harmony and Composition Voice and Speech Culture Drums and Traps Trumpet A NEW PROFITABLE BUSINESS Profitable business of your own. With Simplified Are Welding. Used car motor and chassis lets you ‘Build Your Own” and save $300 to $500. 30 Days Trial—Easy “1Pays-For-lteelf’? Terms FREE Valuable Book If you tell us you're interested. HOBART BROTHERS CO., BoxSM-76, Troy, Ohio | F150 roS 300 4 ss Same Quallty String — $ As in Expensive Racquets Outfit Complete with string, tools and directions A SPECIAL INTRODUCTORY OFFER: Good profits made restringe ğ ing pacqueta, 37 it. string. Colors Purple, Green, Red or White j —also White & Blue Spiral—with contrasting silk trim, awls, stringer’s wax, illustrated easy directlons. Money back guurantce. K Git Send_for Free Catalog and Money Making Plan! A Send Cash, Check or Money Order $1, MONEY ! which includes Postage and Insurance. if Oo © Sent C D., if desired, 15c extra. TO . 0. D. PRO TENNIS STRING CO., Dept. W-B, HARMON, N. Y. AMAZING INVENTION Sharpens [cols Fac V4 i NOW YOU CAN HAVE RAZOR SHARP TOOLS ALL OF THE TIME WITH CHARTIER TOOL HOLDER. ‘This new tool holding attachment can be used with grindstone or emery wheel. You can dress emery or grindstone, sharpen twist drill bits, chisels, lathe cutters, plane iron, most all cutting tools. Enables you, to put a factory keen edge on tools of various shapes and ‘sizes at any angle or group of » arches. Anyone can operate che CHARTIER TOOL HOLDER. SPECIAL TRIAL OFFER! Send $14.50 and Holder will be sent postpaid It you prefer send money order for only $3.75 and Holder will be shipped C.O.D. for balance of $11.25. Use for 10 days, If not completely satisfied, return it and got your MONEY BACK at once. Order TODAY or send for free literature. E. B. DEKKER CO. Clinton Ave. Dept. 31 Oak Park, Ut 25 Piece ELECTRICAL EXPERIMENTAL KIT Ss rays—electro-plate, etc. 25 pleces genuine commercial apparatua, OT TOYS—salvage, bankrupt and surplus stocks purchased from large concerns, ontains SPECIAL 10-volk generator—small D.C. motor—excellent micros phone—transformer—test reslstance wire—secret service micro- $ a 9 9 Dhone—giant magnet—copper anodes—teat cords and clips—and prne | FREE l with each kit—Short Course in Electricity—Laboratory Bench Plena $ and Blue Print! Order direct from this ad or send your name for Free Catalog and Booklet ''20th Century Electronic Magie,'” ELECTRICAL SALVAGE COMPANY Box 524-AA Lincoln, Nebr. Steady cash for you in full or spare time, Over 250 household necessitles—things people must buy; Proven fast sellers— steady repeaters. lg carnings very first day: FÖRD TUDOR SEDANS GIVEN PRO. DUCERS., I'll show you how to start at once; send you everything—Big Display Outfit and auick cash plans. Detalls FREE—no obligation. Just send name on postcard. ALBERT MILLS, 1793 Monmouth Ave., Cincinnati, Ohio ` H RAISE RABBITS FOR US We Pay You Up To $5.00 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 showing names of buyers in various parts of America who continuously buy all rabbits offeredthem. Allfor10 cents. OUTDOOR ENTERPRISE CO., 113 Maln St., Holmes Park, Mo. NEED MOREY? Write for free booklet describing ‘107 Plans for Operating a Successful Business of Your Own”. “ Y Make from $20 to $100 a week starting in spate time at home. No peddling or house-to-house selling. Booklet sent free, and without obligation. Write for f your copy today. ELITE PUBLISHING CO. REE 214 Grand St. New York, N. Y. BOOK E Dept. G Learn Public Speaking At home—in spare time. Many overcome Btage-fright,’’ gain self-confidence, and increase thelr earning power, through abilit to sway others affective speech, Write for free Booklet, How to ‘ork Wonders With Words and requirements. NORTH AMERICAN INSTITUTE, Dept. 2058 3601 Michigan Avenue Chicago, No JOKE To BE DEAF -Every deaf person knows that=- Mr. Way made himself hear his watch tick after being deaf for twenty-five yeara, withhia Artie ficial Ear Drums. He wore them day and night, They stopped his head : aes noises. They are invisible andcomfortable,nowires fi or_batterles. Write for $ TRUE STORY. Also pont on Deafneaa, Artificial ar Drum THE WAY COMPANY Detroit, Michlgam 741 Hofmann Bidz. . ` A Regardless of strength or size defend yourself and friends i against any foul attack, from $ bullies or by gun, knife or club, Subdue with ease persons inuch stronger than yourself. A complete course on approved American Follce Jiu-Jitsu by Internationally known police Instructor. 151 lustrations with detalled instructions pocket size, 13 knockout blows without using fists. Send One Dollar Full price, or C. O, D. S, J. JORGENSEN i 715 Maritime ‘Building Seattle, Washington & 26 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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DIESEL GASOLINE - KEROSENE (MSZ Enclosed o Self-Oiling o Roller Bearing i A size and style for every purpose. Most economical power for farm or factory. Put | one to work and watch it pay for itself. Sold Direct From Factory to You! Write today | for FREE Catalog immediate Delivery. | WITTE ENGINE WORKS 157B Oakiand Ave. 255G So. 2nd St. KANSAS CITY, MO. HARRISBURG, PA. Learn to MOUNT. BIRDS Be an expert Taxidermist. We teach you at home By Mail to mount Birds, Animals, %Game-Heads; to tan skins, Mount wild game also common animal % Squirrels. rabbits, frogs and p ù eons. Big Profits in apare time. J FREE BOOK Fels, ll, about and bow to turn your spare time into Sure Profits. Free. asend To- ” day. Don't delay. State A i N.W. SCHOOL OF TAXIDERMY E47 ŠEINOJdBIdi, orishas Neb. ROLL-A-STRIPE — the lowest priced a commercial striper on the market— stripes automoblles, airplanes, models, furniture—used with paint, varnish or jnk for sign painting and interior deco- tating—sturdy, efficient, compact. Any one can stripe any surface with N ROLL-A-STRIPE, Just roll along surface to De decorated. Specially knurled nhel makes even fow. Ready for use. $1.50 postpald. See your dealer today or order one direct. Modcraft Industries, Dept. D-7, 2908 N. Nordica Ave., Chicago WANT A CAREER IN PHOTOGRAPHY? Wonderful money-making opportunities in this growing field. Earn while learn- ing. Practical, individual instruction in every branch of Professional and Amateur Photography, Personal At- tendance and Home Study courses. 26th year. Free Booklet. New York Institute of Photography 10 West 33 Street (Dept. 153) New York MAN IN EACH TOWN To Plate Auto Parts, Reflectors, Bathroom Fixtures, Refinish Beds, Mirror S, Chandeliers, by late method. Experience unnecessary. Simple plan of manufac- turing at home starts you in big money making busi- ness. Free particulars and proofs. Write today. GUNMETAL Co. Ave. P Decatur, Ill. LET ME SEND YOU THIS ‘TAILORED SUIT AND PAY YOU UP TO $10 IN A DAY Amazing new ideal Wear this splendid suit and I'll Bey fort It Jf f youll follow my easy plan and qualify. hooge aul je woolens, tailored to your meas- ure. Just chow it to your friends. Make up to $10 in K ay—eas: 7 yepresenting big nationally-known tailo: EY rheng No No y for detali of cen AST UALS, ii AMPLES for details of se! ew and actual Gamries Se "fed, Graves, OMi Pres. STONE-FIELD à pres any TELD CORP, » 1300 W, Harrison, BE A PILOT-FLY A SHIP If you are stumped at the high cost of training to qualify for a license and a good future in aviation— write, enclosing stamp, for information on our APPRENTICE PLAN Mechanix Universal Aviation Service, Inc. Strathmoor Sta., Dept. A, Detroit, Mich. BE A TRAINED AUTO-DIESEL EXPER PRET ARE NOW for. ich new fields at ppportual in Wn thla fas fast- | Tow! +L rain en needed fo: rucka, usses. tractora, dorm power and righting plants. Practical, EARN BIG easy, re-time training plan offers quick way talgood jobs M (0) N EY U Write today for Fr look and pay-as-you: learn ea with valuable equipment included to help you earn SEND FOR extra money quick in spare time et bome without leaving fe your present job while training. 3 MOTOR INSTITUTE of AMERICAE 4554 Broadway Dept. GD-13 Chicago, Ill. pooe=—Mail Coupon Today! -—===~- MOTOR INSTITUTE of AMERICA 4554 Broadway, Dept. ap-13 Chicago, Ul. Without obli; atin ‘ime, send Free Auto-Diesel Book, yith full details sJan- Way’! Trainiog and ‘‘Pay- As-You-Learn’’ Bt good pay, or a profitable auto repair business of your own. from the pioneer automot e home-study school. UTO - DIESEL Book, Trailer Plans and Parts Utility Trailers, 4’ x 5’, complete less tires, 50. trailer pla 50e. Cabin traller pla $l. bargain prices. Write for free catalog of parts. SHAMROCK TRAILERS 11777 Grand River, Detroit, Mich; ART LESSONS ‘ae Become Talented Artist with Big Income This thorou gh course by Alexander puray, Hees famous Art Sc! ool instructor, makes it easy t COURSE COMPLETE Utility ailer parts at learn art in spare tlme. Teaches commercial art, cartooning, lettering, anatomy, perspec- tive, adv. layout, etc., without bother or ex- pense of corre sponding. You Fee all 60 lessons at oncc—no walting for next lesson. Over 815 tion illustrations. 125 pases of drawing Pp FREE. Send only $1. Cowrse postpal ' pay postman plus postage. MONEY BACK If not de- y ted after inspecting. Start now turning yous spare time into MONEYI UPPLY CO., Dept. A112-G 5 for Complete UÇATIONAL cLa CITY CARRIERS] = aan GOVE RNMENT START $1260 to $2100 YEAR MEN—WOMEN .-------- Experience unnecessary. ,/ Franklin Institute Dept.K305 : 7 P Gomon muram , ROCHESTER, N. Y. y 1 _Gentlemen: Rush to me, GET READY 1 FREE of charge, list of IMMEDIATELY Pa o £ Geeren big Dr n jobs. Send T 32-page boo. Mail Coupon S describing salaries, vacations, Today— K hours, work Tell ae what to do to get one of these jobs. SURE & / 7 ra BIE sensaryeustenavanennns PAE AOE N A 7 A af Address suserorssovoree aad teenies sea P aaisa oi venisp sinuosa Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 27

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Lhe NATION Sizs in Circle, above—Gov. Pollard of Virginia proposes a resolution at a National Convention. Note directional micro- phone behind him and broadcasting microphones before him. HE political machinery for nominating the presidential candidates of the two major parties remains as old as the parties, but in June this year the entire nation will be given ringside seats at the National Con- ventions at Philadelphia and Cleveland, with both parties taking advantage of every latest scientific wrinkle to bring the conventions to your home or local movie. In stadiums, ball parks and town squares loud speaker systems will be set up for the hundreds of thousands of persons who will assemble on the evening of June 27 to hear President Roosevelt accept the Democratic nomination. Republicans, too, are planning on having their candidate broadcast his ac- ceptance of the nomination from their con- vention hall. More than six thousand persons will journey to the convention cities to select the 28 Scenes such as this at the Republican Convention of 1932. in Chicago will be duplicated soon by the Democrats at Philadelphia and : the Republicans at - Cleveland, Millions will listen by radio . to the proceedings. men for whom you will vote this fall. There will be 1,200 delegates at the Democratic Convention in Philadelphia, with 1,700 alter- nates, while the Republicans at Cleveland will have 997 delegates and 1,116 alternates. Then there will be the 106 National Commit- teemen of each party, more than 1,000 re- porters, and several hundred telegraph, radio, newsreel men and news photographers. The voting delegates will be seated in the front of the hall in four gigantic banks of seats. Delegations from each state will be seated together, with huge signs designating the seats. The alternates will have chairs Modern Mechanix Hobbies &

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onWNational Conventions by BOB GORDON Politics becomes mechani- cally minded in 1936, and both Republicans and Democrats are providing the machinery which will permit the nation to listen in to the proceedings. Wild demonstrations accompanied the nomination of Franklin D. Roosevelt, Democrat, for the presidency in 1932. All state delegates, bearing placards, paraded past the speaket’s table. cn the auditorium floor directly behind the delegates. Aisles between the banks of seats will be especially wide. The speakers’ stand will be an elevated platform erected on the front center of the stage. On this platform will be the Chair- man of the Convention and the principal speakers for the day. On this platform also ‘Inventions, July, 1936 ~ The nation, in the form of radios, news reels and newspapers, will have the chosen seats at the Democratic Convention in the Philadelphia Auditorium. Above is shown seating arrangement. Left—The Cleveland Auditorium into which will parade 997 Republican delegates; 1,116 alternates. will be the operator who will control the radio and newsreel microphones and the public ad- dress system through a maze of 53 switches. From a technical point of view, this switch- board operator will be the most important man in the convention hall, for he will have complete control of all sound effects. It will be he who will, under the direction of the Convention Chairman, sort out the correct speeches from the bedlam created by a thou- sand men all anxious to talk at once, and to see that the voice of only the speaker recog- nized by the chair is amplified on the public address system, is broadcast to the nation over the three networks, and is recorded by the newsreel camermen. On the rostrum of the speakers’ platform. will be the three microphones of the broad- casting companies. The voice of the regular speakers will be carried directly to the sound- proof studios erected over the back of the stage, and from there, over telephone lines, will be carried to the hundreds of broadcast- ing stations on the networks. The five news- reel companies will also have microphones here connected directly with recording ap- [Continued on page 129] 29

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Highest STRATO-PHOTO Covers 330 Miles I HT LINE RULED AIN TO: SHOW CURVATURE This photograph, taken from the highest point ever reached by man, clearly reveals the curvature of the earth, as shown by the ruled line and the curve of the horizon, 330 miles away. when it reached an altitude of 72,395 feet. ; The photo was taken from the stratosphere balloon Explorer II A special filter and an infra-red sensitive film was used. The nearest objects in the foreground are 30 miles away. The Black Hills, shown as a dark patch in upper center, are from 120 to 180 miles away. HE greatest photograph ever taken with a single lens, covering an area larger than the State of Indiana, has just been released by the National Geographic Society. The mas- terpiece of photographic art was taken by Capt. Albert Stevens from the gondola of the stratosphere balloon Explorer II when it reached an altitude of 72,395 feet on the recent National Geographic-U. S. Army Air Corps stratosphere flight from the Black Hills of South Dakota. For the first time scientists, by means of this photograph, are able to study the lines of demarkation between the troposphere and the stratosphere. The troposphere is the body of dust-laden shifting air currents which blanket the earth, often to a depth of 37,000 feet or more, while the stratosphere is the region of calm air and constant cold. The photograph was taken from a position about 35 miles south of Murdo, S. Dak., and shows the jagged, snow capped peaks of Mon- tana and Wyoming as a smooth, curving line on the horizon, 330 miles away. A hazy line above the horizon marks the end of the tropo- sphere. Nearly 96 per cent of the earth’s at- mosphere was below the camera when the picture was snapped. For that reason the sky appears absolutely black. The closest land . in the foreground lies 30 miles away. 30 Scrap Iron Pays For Political Race ECHANICAL ability is seldom called upon to play a part in politics, but in the instance of Arch Campbell, of Mankato, Minn., a knowledge of machinery is directly responsible for his becoming a Republican candidate for Congress. Junked automobiles, worn out machinery, and salvaged scrap iron provided Mr. Campbell with the funds for his filing fee. In his iron reclamation shop, use- less material is made as good as new. He is an expert in all forms of metal working. Arch Campbell, of Mankato, Minn., is putting his mechanical ability to work in politics. By reclaiming iron from old cars and machinery he is financing his campaign for Republican Congressman. Recently his scrap iron paid for his filing fee. Modern Mechanix Hobbies &

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Radio Waves Piped In Tube; Big Aid To Television Seen IPE lines through which ultra-high fre- quency radio waves flow with the speed of light have been developed simultaneously by the Bell Laboratories and the Massa- chusetts Institute of Technology. The pipe line carries electricity in much the same man- ner as a speaking tube carries the voice. Instead of traveling through the metal of the pipe, the waves are conducted through a thin layer of insulating material inside the tube, free of external interference and static. Possibilities of using the pipe line for trans- mitting television signals are now being in- vestigated. Odd-shaped “Flying Wing” Is f ONRAD KRAFT, a young engineer of Thuringia, Germany, has invented a radically new type of airplane in which the wing surface is broken into the form of a W for greater stability in flight. Using a model with a wing span of 2,200 millimeters and a depth of but 280 millimeters Kraft oroved CROSS SECTION THRU PASSENGE COMPARTM ME FUEL AND OIL TANKS PASSENGER ROOM Dr. George C. Southworth is shown here inspecting his pipe- line system for conducting ultra-high frequency radio waves. Waves pass through pipes like sound through a speaking tube. Model For Proposed Sky that his design was not affected by side winds, and would climb more rapidly than other models. He plans to use his design for a great tri-motored plane having landing wheels in the wing angles and a roomy passenger com- partment between the wings. Fuel would be carried in tanks in the hull. Liner WIRELESS STATION _- SECONDARY aT ANDING WHEE LANDING WHEEL SIDE VIEW | AT LANDING STATION ROSS SECTIGN THRU CABIN ood Konrad Kraft, shown at upper right with his model, is the designer of this proposed “Flying Wing” air giant. Tests with his model have proven it to be unaffected by side winds because of angular construction of wings. -It:is also reported to require less space for taking off. Drawings show the arrangements of motors, cabins, landing gear and rudders of proposed sky liner. Inventions, July, 1936 31

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1909 INITIAL SUCCESS 7 ft BLERIOT CROSSES THE ENGLISH CHANNEL AND FIRST MASS PRODUCTION OF RADIAL TYPE ENGINES RESULTS WHEN 400 OF THESE TINY BLERIO TYPE XI MONOPLANES "CROSS-CHANNEL" MODEL POWERED WITH 27H.P AIR-COOLED ANZANI ENGINES ARE ORDERED WITHIN THE SAME HISTORIC YEAR. 1909 -1912 PROGRESS / ROBERT ESNAULT~PELTRIE -BRILLIANT FRENCH AERONAUTICAL ENGINEER AND EARLY EXPONENT OF STEEL TUBE CONSTRUCTION INTRODUCES THE "FAN" TYPE RADIAL, AND LIKE BREGUET (CONTEMPORARY AND OF EQUAL FAME), PRO- DUCES A SERIES OF PLANES POWERED EXCLUSIVELY WITH RADIALS REDUCTION GEAR FOR, PROPELLER NOTE STACGERED CYLINDER ARRANGEMENT, DISTRIBUTOR OIL SUMP CUT-AWAY VIEW (Op TYPICAL “TWO-ROW — -CYLINDER RA . This particular engine has a reduction gear to the propeller shaft. Note the overall length of the motor. Bleriot’s first flight across the English Channel gave the radial air engine its first impetus. The immediate result of his venture was the sale of hundreds of the Type XI or Cross-Channel model. Equipped with three-cylinder, air-cooled Anzani radials, these little ships were soon flying all over the world. The light rotary radial followed and persisted until after the World War. By 1920, there was a swing to “in line” and “V” engines. 32 Three stages in the history of radial engines are shown. The Canton-Unne, an air-cooled engine used on the Breguet, per- sisted until dis- placed by the Gnome and other rotary radials. THE EFFICIENT BREGUET BIPLANES OF THIS PERIOD OFTEN MOUNTED WATER- COOLED RADIALS IN THE MANNER SHOWN 3 DRIVING PROP. THRU BEVELGEARS #4 WENTY-SIX Twin Wasp engines of 1,000 horsepower will begin service in July on air liners as.the latest triumph in radial engine design. A far cry from the three-cylinder radial motor which bore Louis. Bleriot over the English Channel in 1909, the new engines are described as the mightiest yet built for regu- lar service. The new air-cooled engine is the 1,830 Wasp of Pratt & Whitney. The 14 cylinders are in two circles, one behind the other. Normal power maximum is 1,000 h.p. with an emergency maximum of 1,150 h.p. Weighing 1,250 lbs., the motor develops, at sea level, a horsepower for each 1.09 Ibs. It will enable the Douglas DC-3’s of the United Airlines to cruise at over 200 miles per hour and to fly non-stop from San Fran- cisco to Salt Lake, Salt Lake to Chicago, and Modern Mechanix Hobbies &

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” ANCESTOR OF THE 34: MODERN PURSUIT Until shortly be- fore the flight of Lindbergh to Paris, rotary radials were in use. It was a troublesome type of motor and yielded to static designs after only a few years. Chicago to New York. The Navy has ordered 200 of the engines for combat and patrol planes and is barring their export. At its first public demonstration in East Hartford, Conn., the new engine took up a two-year-old Vought Corsair with a run of only 150 feet. After banking once, Pilot H. H. Sargent sped by observers at 225 m.p.h. Witnesses said the roar of the engine was the deepest in their experience. “The time has come when the single row radial air-cooled engine in large transport operation is as obsolete as the four-cylinder automobile engine,” said Charles W. Deeds, Pratt & Whitney general manager. The new engine is the result of experimen- tation which began in 1929 when Pratt & Whitney engineers became convinced that the economical power limit of the normal nine- eylinder radial engine had been reached. Inventions, July, 1936 me—— FLUENCE AIRPLANE DESIGN THROUGH- OUT THE WORLD.- i THE 1913 SOPWITH (80 H.P. GNOME) DE- PICTED HERE af IS THE DIRECT : THE DOUGLAS DS-3 — WORLD'S NEWEST AIR- : LINER-IS POWERED WITH THE LATEST TWO-ROW RADIALS 1910-1918 THE ROTARY RADIAL ENGINE ERA .~ THE GNOMEROTARY TYPE RADIALS REVOLUTIONIZE AIRPLANE PERFORMANCE á AND PROFOUNDLY IN- 1927 Z ©" FIRST NON-STOP FLIGHT BETWEEN NEW YORK AND PARIS LINDBERGHIN WRIGHT- (RADIAL) ~ POWERED MONOPLANE WRITES A NEW PAGE IN HISTORY AND CON- CLUSIVELY DEMONSTRATES THE SUPERIORITY OF AMERICAN RADIALS z 1935 HOWARD HUGHES BREAKS ““F— WORLD'S SPEED RECORD FOR LAND PLANES WHEN HIS RADIAL-POWERED RACER ATTAINS 382 M.P.H. Smoother operation and longer life as well as tremendous power are claimed for the 14- This is the new 1830 Wasp. cylinder two row design. There are 250 light impulses per second from a 52-inch cylinder at cruising horsepower. The combination of high crankspeeds with comparatively small cylinders permits a greater mean effective pressure with any given fuel. More power for a given displacement can be, obtained. Automatic valve gear lubrication and mixture con- trol and 21,000 square inches of cooling surface are features. 22 99

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Average MAN Could Lift The WORLD Nic Sprank Offers $5 for Best Oddity pi 116,000 POUNDS’: EMPTY IT WEIGHED 208,000 POUNDS. A SLÄMMI, Doylestown, Pa, 3 : A SHOUT UNDER WATER CARRIED NINE MILES! ™) IN CONDUCTING SOUND EXPERIMENTS ON LAKE CONSTANCE, EUROPE'S LARGEST LAKE,BAVARIAN SCIENTISTS Mm RECORDED A SHOUT THAT CARRIED NINE MILES UNDER F WATER. AS THE RECORD ON LEVELLAND IS BUT TWO 4 MILES, THE SCIENTISTS HOLD THAT WATER ISA BETTER SOUND CONDUCTOR THANAIR, =, Wel BST 102K, Chicago, LMS NITROGEN IODIDE ! — THE EXPLOSIVE CRYSTALS ARE FORMED BY COMBINING | IODINE CRYSTALS WITH A STRONG AMMONIA SOLUTION, THOUGH NOT VERY POWERFUL, NITROGEN IODIDE POPS WHEN AFLY TREADS ON IT, — George Dekoren Newark Zax SEM A s A ve) Five dollars will be paid for the Oddity used by Nic Sprank as his central illustration. One dollar will be paid for all others used on this page. Send your Oddity to Nic Sprank, Modern Mechanix Publishing Company, Fawcett Bldg., Greenwich, Conn. Source or proof of each Oddity must be given. Send all Oddities separately, not with other manuscripts or letters. 34 Modern Mechanix Hobbies & Solomon Guttman, Mitheapalts, Minn.

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Capt. Eyston Sets 158 M.P.H. Record In Diesel-Powered Car URTLING over the Bonneville Salt Flats at 158 miles an hour, Capt. George Eyston of London, England, was successful in setting a new world’s speed record for Diesel powered racing cars. Captain Eyston drove his streamlined Fly- ing Spray over a seven-mile straightaway. The first three miles were for building up speed, the fourth was the measured mile, and the last three were for slowing down. On three runs he made 155 m.p.h., 158, and 153. Flicker Bulb Is Self-Contained E elaborate mechanism necessary to keep a traffic warning light flickering on and off is dispensed with in a new type bulb which contains its own flicker mecha- nism in its base. It is simply in- stalled in its socket where it flashes con- stantly. This small traffic bulb flashes at a constant rate of speed with- out any additional mechanism. | STATIONARY f ł LENS —— > AG wf “FOCAL PLANE” : SHUTTER MOVING LENSES REVOLVING DISK _ This remarkable action photo caught Capt. George Eyston just as he flashed into the measured mile where he set a new world record for Diesel powered automobiles of 158 m.p.h. Camera Pictures Motor Explosions OVIE film speeding through a highly specialized camera at 250 miles per hour is now enabling engineers for the first time to photograph the explosion of gasoline in an automobile engine. One explosion lasts less than 1/250th of a second, during which time the camera makes 30 perfect pictures at the rate of 5,000 a second. The explosion is made visible by a fused quartz cylinder head. The secret of the high- speed camera is in the revolving lenses which rotate at the same speed as the film. NUMBER 3 | i TRANSPARENT - SHUTTER OPENS! FOR ONE eo QUARTZ WINDOW REPLACES CYLINDER HEAD ENGINE $ EXPLOSION ONLY SPOOL FOR EXTRA FILM This is the 5,000-picture-a-second camera used in photographing motor combustion. As the explosion takes place beneath the quartz cylinder head, its, action is reflected by mirror into a stationary lens and a disk of smaller lenses. At right are thirty pictures of a single explosion in an engine running at 2,000 r. p. m. All thirty pictures were exposed in 6/1,000 of a second. Arrow shows ignition spark in exposuré two and flame of explosion starts itt exposure four, progressing as shown. Inventions, July, 1936 35

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LIGHTING į The naturalness of color movies is largely dependent upon great quanti- ties of light. This “broad”? arc light serves for general illumination. About twenty-five lights such as this are needed for each color scene. EHIND the fascinating natural color mo- tion pictures that are sweeping the country there lies a story of astonishing de- velopments as spectacular in their field as the color movies themselves. Lets visit the huge Stage 8 at United Artists where Pioneer Productions filmed a dance sequence for “Dancing Pirate,” and observe the new mechanical equip- ment and new technique being employed in order to bring a color film to the screen that has coloring as vivid as nature her- self. Because everyone, even in Hollywood, is interested and curious about the equipment and methods employed in making color pro- ductions, a uniformed guard at the stage door stops the curious. Even the employees and actors of the studio who are working on other films would “gang-up” on the color setting ` and interfere with the work. The first thing noticed that is different from the setting of black and white movie is the great number of lights used. Lighting equip- ment or “rigging” of great variety is every- where. Overhead is a solid bank of “broads” which are used for the “filler” or overall illumination. High up on the “parallels,” sixty feet up in the roof on the “catwalks,” everywhere, on the top the setting and on the floor is lighting paraphernalia used for the special effects and for painting the desired scene. Two or three times more light is re- 36 THE WAY Charles Collins and Steffi Duna in an action scene for “Dancing Pirates”, the latest indoor color film. Note the lights at top of | set. Each one of which emits more than 250,000,000 candlepower. Robert Jones, left, and Lloyd Corrigan, center, are the two men to whem credit must go for the success of ‘Dancing Pirates”. Jones is color designer. and Corrigan the director. quired in making a movie in color than one in black and white. A new type of arc unit, called the “high- arc” has been developed for ‘‘Dancing Pirate” which emits 325,000,000 candlepower in a narrow beam. In order to illustrate the amount of heat given off, this arc, which draws 150 amps, if focussed to a narrow beam is capable of almost instantaneously setting a block of wood ablaze at a distance of Modern Mechanix Hobbies &

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FOR COLOR MOVIES by EARL THIESEN Fascinating as the miracle of color is upon the screen, it proves even mote fascinating when one steps “behind the scenes”. The new, novel equipment in use, the lights, and the cameras are fully described in this exclusive article. In this "behind the scenes” photo of a color movie in the making one can see how the lights are arranged to shine with extra brilliance upon the gallows in the center. This immedi- ately but unnoticeably attracts the eye to the center of action. twenty feet. Twenty-two of these powerful lights, besides fifty-six units of less capacity, were set up for the dance sequence. Ac- cording to measurements, 16,000 amps were required for a daylight effect on this set- ting, or enough electricity to light an or- dinary town of 10,000 or more inhabitants. It is enough power to illuminate several metropolitan city blocks with all the street signs and office lights. Eight to ten thou- sand amps, we are told by the “gaffer,” the movie name for the electrician, were re- quired on the same setting for a moonlight effect. With the older type of “sun-are” light used in earlier color pictures the eyes of the actors were fatigued and strained and gave what is known in the studios as “kleig-eyes,” because of the presence of ultra-violet light. Inventions, July, 1936 From a “parallel” above the set the camera- man and his crew shoot a “high” scene. The microphone in the cameraman’s hand is for broadcasting instructions during rehearsals. HREE NEGATIVE MAGAZINE FINDER DEFLECTOR SWIVEL MOUNT Here is a front view of the three-color Technicolor camera. n the magazine are three negatives side by side. One nega- te records red-orange, another blue-green, the third, yellow. A prism behind the single lens divides light rays into colors. Now, on the new type “high-are” a special glass filter which contains a metallic salt is used over the front of the light unit which absorbs the ultra-violet. This glass is also framed so it won’t break from the heat and drop on the players, while the arc mechanism itself has a metallic insulator of cooling flanges which radiate off the heat. A new lens, the “Morine,” is used on some 37

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Electricity For One Scene Would Light City Brilliant sunlight floods this scene, but leaves no dark shadows. It comes from the sun-are lights shown at top. Enough electricity to light a town of 10,000 inhabitants is consumed by the 22 sun-arcs and 56 smaller units needed. of the lights which permits focussing and spreading the light so the center of interest of the picture can be high-lighted. Because the eyes of the audience are drawn to the bright- est portion of the scene, the cameraman al- ways lights the scenes so the center of interest is brightest. In other words, the action of the story is framed by a halo of light. Are light, called a “cold-light” in the studios because it contains a high content of blue, is used in filming color movies rather than the Mazda Incandescent which is a “warm” or yellowish light. While the in- candescent light appears white to the eye, it has the effect of being very yellow in the color processes. The ares when photograph- ing color give a very close approximation to sunlight. Mazda illumination was used for the warm yellow light seen streaming through the doors and windows in the moonlight scenes of this picture. The color of the setting—an outdoor scene AOTH ANNIVERSARY OF MOTION PICTURES Forty years aga Thomas Edison built a camera and George Eastman produced film for it—and the movies were horn. The time was April 23, 1896 and the place, Koster Bial’s Music Hall in New York City. The first showing dominated space in the “New York Herald,” which headlined: “Triumph Of The Vitascope. Edison's achievement to Reproduce a play made Pictorially a perfect success. New phonograph coming. Recorded volume of sound will be magnified so each actor's speech will be heard,” Brt COOLING Vo FINS af CARBON ARC AUTOMATIC ADJUSTING. AUTOMATIC GEARS This is the interior of the sun-arc. The geared motor automatically keeps the carbon arc constant. Special connections keep the are and motor silent. Earlier arcs were noisy. Above—The controls of the suh-arc can focus the light on such a small spot it will ignite wood. The numerous controls are essential for accurate lighting. Left-—-Two men can handle the sun- arc while on earlier models six were required. The lens screens out ultra-violet rays and is similar to those which are used in lighthouses. with an early Spanish church in the back- ground—is a warm neutral tan-brown, and while the eye cannot detect a certain blue quality to the coloring of the set and its props, blue has been added to the paint used so as to cover a certain deficiency of the Techni- color process which leans to the red and orange in reproducing color. The floor of the sound stage on which this setting stands has been covered with a prop “ground.” It looks similar to real dirt but close observation shows it to be a tightly stretched burlap rug that has been dyed a ground color. Real earth could not be used because the feet of [Continued on page 125] Modern Mechanix Hobbies &

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Giant Cameras Photograph Sun’s Eclipse On 30-Inch Film ATTERIES of cameras more elaborate than any yet assembled will be on hand near Ak-Bulak, Siberia, to explore the chem- ical composition of the chromosphere during a total eclipse of the sun on June T6. From the United States a joint expedition of Harvard University and the Massachu- setts Institute of Technology, headed by Dr. Donald Menzel of the Harvard Observa- tory, will bring equipment which will auto- matically record the spectrum of the chromo- sphere on continuous motion picture film 30 inches wide. Hundreds of still photographs will be taken at one-second intervals for four minutes by 15-foot cameras. The huge spectrograph cases for the cameras were made possible by a new metal one-third lighter than aluminum, known as Dowmetal. There will be seven spectro- graphs to cover the full spectrum from infra- red to ultra-violet. Further information concerning the halo which surrounds the sun during an eclipse is also expected to be uncovered. Small Arc Welder Handles Big Jobs This portable arc welder, weighing but 150 pounds, can handle any welding job when plugged into a light socket. It is low in price, and operates at from 5 to 9 cents per hour. NEW arc welder operating from any ordinary light socket employs an en- tirely new construction principle which per- mits it to handle all arc welding jobs at an operating cost of but from 5 to 9 cents an hour. It has a maximum output of 80 amperes at 40 volts and is priced economically. Inventions, July, 1936 This giant machine is a movie camera using film 30 inches wide. It will be used by the Harvard-Massachusetts Tech expedition to Siberia to photograph the eclipse of the sun. Amphibian Sets Two Altitude Marks OARING to an altitude of 27,950 feet, the Sikorsky S-43 amphibian plane shattered two world’s altitude records for laden and unladen ships of this type in a recent test flight over Stamford, Conn. The plane on its record breaking flight was piloted by Boris Sergievsky, and carried as passengers Igor Sikorsky, its designer, and Michael Pravikoff, mechanic. In addition the ship carried a 500-kilogram pay load. In the substratosphere, where the tempera- ture reached 40 degrees below zero, oxygen tubes were used. The S-43 is designed to carry 15 passengers, and is powered with two Hornet engines. Sikorsky’s 15-passenger amphibian, the S-43, is shown here on the flight in which she climbed 27,950 feet, to break two world’s records for laden and unladen ships of this type. 39

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~ FOUND — King Solomon’s Count Byron de Pro- rok (above), Europe’s Roy Chapman An- drews, who found the Jost gold mines of mighty King Solomon. Below—One of the un- told thousands of dus- ky slaves who wash raw nuggets from the gold-ladened subter- ranean streams which flow under the almost- extinct volcano. One of the many tombs (above) of the long-dead consorts to Kings. Right— An actual sketch made by De Prorok showing the mines -as they are today. THE SECRET OF WAR-TORN OUNT BYRON DE PROROK, famous explorer, is again back in the United States after a series of adventures that would make an Arabian Nights fable seem weak and colorless in comparison. He was successful in locating the exact spot where the legen- dary King Solomon of Biblical fame once mined fabulous tons of gold. More important, and perhaps the reason for the Italian hosts pushing their way into Ethiopia, these ancient mines are being worked today on a scale that staggers the imagination. From a volcanic mountain top, de Prorok beheld countless slaves, both men and women, toiling night and day to uncover the heavy golden nuggets. But let this distinguished archaeologist tell his own almost unbelievable story: In the course of my numerous explorations in the interests of archaeology, I have found many ancient tombs and lost cities in Africa. Now I hoped to fulfill one of the major objec- tives of my career, the discovery of the origi- nal mines which supplied the fabulously wealthy monarchs of ancient times: Tut, Hannibal, Cleopatra, Alexander the Great, Solomon and the Queen of Sheba, with the vast supply of golden ornaments which made them famous. i For more than 15 years I have crisscrossed Africa’s ancient caravan trails between Car- thage and Utica, and from the Atlas to the Blue Nile in search of the origin of this lost gold. But without success. However, I had Modern Mechanix Hobbies &

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Gold MINES ETHIOPIA by JAMES NEVIN MILLER located many valuable clues, some of them passed down from generation to generation, others mere whispers gleaned from adven- turers who had been foolhardy enough ‘to penetrate into these mysterious interiors and later lose their lives. These clues convinced me that all trails led into the “back door” of Ethiopia, a remote western desert region ruled over by Solomon Ghogoli, a sultan who admits the supremacy of only one other ruler, Haile Selassie. But an unforeseen difficulty presented itself: In order to penetrate the land of mystery we positively must have Haile Selassie’s official _ permission, and in writing. Otherwise we would be certain victims of Sultan Ghogoli’s murderous warriors. ; This was just before the Italo-Ethiopian war began. But even then Selassie must have foreseen the conflict because he was at that time so much occupied with military affairs that we found it next to impossible to see him. But finally, after endless formalities and dip- lomatic action, the Emperor gave us the first permission ever given to white men. to explore the forbidden land of the Blue Nile. After receiving the first official permit to cross the closed area of the British Sudan we reached Kumuk from Kaston by following the jungle-enclosed banks of the Blue Nile to where Selassie had promised us a military escort of 120. But at the desolate barrier we waited in vain. Inventions, July, Deep in a smol- dering volcano, dusky slaves still toil in the fabu- lously rich mines of Biblical days. Are they the reason behind Italy’s Ethiopian war campaign? Their forefathers slaves to Cleopatra, today’s Abyssinian “customs” men are really brig- ands. And Count de Prorok (mounted) is having border trouble, with his interpreter in loud and heated debate.

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Through Country Forbidden to Hated White Men Right here we made the mistake that almost cost us our lives. We decided to penetrate the interior in the hopes of meeting the escort there. This would have been a wise pro- cedure if we had been properly supplied with official passports from the Emperor. Unfor- tunately the soldiers who were to bring them failed to show up, and we were so impatient to be on the move that we proceeded any- way. So we headed straight for the Old Man of the Mountain, dread Solomon Ghogoli, Sultan of the Shangul. He was over 100 years old, maintained many wives and was, it was rumored, the owner of secret gold mines which no white man had ever seen. Never was he known to permit a European or American to visit his vast, savage realm. For three terrible days we trekked across the enormous canyons and great mountains of this legendary land. Even in the shade our thermometers registered from 140 to 160 degrees Fahrenheit, so much greater than the heat of the human body that we were actually able to cool our hands by clamping them under our armpits. The merciless heat once reached 167 degrees, three-fourths as hot as boiling water. Our porters were terror-stricken. They were fearful of being caught and killed by the savage sultan. No wonder many of them deserted. On the fourth day we made a fantastic dis- covery. While daytime camping in a jungle 42 De Prorok’s party (left) have just been captured by Ghogoli’s emissaries when the Count’s cam- eramen took this shot, another of the exclusive pictures you see here. -De Prorok is second from the extreme left, the man with the beard. When mad savages scrutinize you in this ‘fashion, it is a- question of keeping your-head -or losing it. When the seasoned adventurer goes on safari, physical com- forts are discarded, as shown by De Prorok’s tent and personal necessities. But even these were dropped at the mines so that the porters could trek back with museum pieces. This picture nEn Sultan Ghogoli’s warriors taking the Count into camp with the intention of holding him for ransom, making him a slave, or murdering him and salvaging his head. with my companions I suggested we climb a great mountain about two miles from our camp. We did so and found its approximate center was the huge crater of a smoldering volcano. Aided by powerful binoculars from _ the heights on the far side we saw, a thousand feet below, a weird sight: untold thousands of black slaves, both men and women, work- ing feverishly in ` the subterranean river bed. Modern Mechanix Hobbies &

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Smoking Wolcano Hides King Solomon’s Mines Amazed, I asked our guide, Diressa, “What on earth are they doing?” He warned “Come away, master! They are Ghogoli’s slaves, washing out gold,” The sight excited us, and soon we tumbled and slid down there. For the skeptical minded, let me add that our movie cameras took in the entire astounding spectacle. Some of those nuggets were as big as a man’s fist. While the cameras were grinding away, my fellow scientists and I explored the rocks of the nearest canyons and found ancient hiero- glyphics and rock drawings on the entrances of many of the abandoned mine shafts. Our excitement knew no bounds. By purest chance we had achieved the major objective of our expedition. Think of it! We had found the precise spot where King Solo- mon of Biblical fame mined the gold that provided his court with unparalleled luxu- ries! Was there much gold here? There must have been untold tons of it, and the precious metal was being panned in the same crude way as practiced in Bible times. Yes, these mounds and the rock markings told us the story students of archaeology had been seeking in vain to find ever since the mines were lost. We were highly successful in bribing the guards with the aid of Ethiopian money, to permit us to look at some of the tombs. Which Photographs of King Solomon's mines are today aiding the drafting of another exploration. trip into this same territory, and so cannot be released to public gaze, but here are De Prorok’s authentic drawings of the mines. The map at the right shows the probable lo- cation of King Solomon’s mines. But if you intend going there, banish the thought. For when you are camped out there on the veldt and the tom-toms beat, all the gold in the world wouldn’s buy your chance for fife. Inventions, July, 1936 . lurked everywhere. may sound strange—our “buying them” in this fashion, since they were handling such vast quantities of raw gold. But if a guard was caught with virgin gold in his possession he was executed or mutilated. But any actual money was not disturbed. Then we heard the booming of giant tom- toms telegraphing messages to Ghogoli in his stronghold 50 miles away. His sacred ter- ritory was being invaded by members of the races he despised more than anything else in the world. And here in the mines danger The blazing heat was all but unbearable and the guards locked murderous. Nevertheless, we started digging into the tombs and worked all that night and through the next day. But at dusk the tom-toms began to boom again. Time was short. We knew we musi act with the greatest speed, and instantly. Hastily we packed up our specimens and started on a race for the Yabus River and safety, and three days later, utterly ex- hausted, we reached Albi Moti, the nearest Ethiopian village, praying that the promised military escort was there awaiting us with our official passports. But it was not. We camped on a hill near the village, and as if by magic suddenly found ourselves [Continued on page 141] SF te Re i 4 SS F ‘ Sas ont] E j= KING SOLOMON'S LOS ` GOLD MINES

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Giant Diamond Cut To Lazare Kaplan is pictured here with Jonker diamond which be successfully cut, Originally weighing 726 carats, the huge stone will be used in making a necklace yalued at $2,000,000. ‘““Whippets” Guard Europe’s Seas INY torpedo craft capable of speeds of 40 knots while carrying a full load of torpe- dos are being constructed for several of the European powers by a British boat building firm. The boats, which are not much larger than a pleasure cruiser are capable of de- fending themselves against destroyers. Hav- ing a cruising range of 800 miles and being of minute size they can enter enemy territory without being spotted. The boats are 55 feet long and are powered by 900 h. p. motors. - _ Employing electric eyes to operate classroom lights and glass Se Se i k — ie Capable of giving chase to full size destroyers this “Whippet” torpedo boat measures only 55 feet i in length, Fully loaded it has maximum speed of 40 knots; cruising range of 800 miles. 44 Make $2,000,000 Necklace HE 726-carat Jonker diamond which re- cently was the world’s largest and finest uncut diamond is now in three pieces. Later _ these three pieces will be split into. twelve pieces, most of which the owner hopes to see sold in a $2,000,000 necklace. It was Jacobus Jonker who found the diamond in a South African field. Lazare Kaplan, who cut the diamond, is still smiling over the success of his biggest job. He tapped a wedge against the uncut stone with a brass hammer and severed it—an operation so delicate that even the present owner, Harry Winston, wouldn’t look on. There was a silent moment in the workshop in which everyone sat tense, then a few taps of the hammer and Kaplan exclaimed, “I did it!” Modern School Built Of Glass Bricks bricks instead of windows this grammar school at Hibbing, Minn., is claimed one of the most modern educational centers. DUCATION as well as industry is in the stage of modernization with the little red school house becoming a thing of the past. Featuring all-glass construction and fur- nished in the most modern taste, Park School in Hibbing, Minn., is perhaps the most up-to- date grammar school in the entire country. Where light was not desired regular bricks were used, Electric lights in the classrooms are controlled by an electric eye which auto- matically turns them on when the sun is not shining. Desks can be moved where desired.

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ccompanimentof g _ whistles and -the “=> cheers of thousands of spec tators, . the Queen ; Mary. started on her test trip, The =complete story of this amaz- “ing: liner ‘starts on page 46 - SAn = A 7 SeA

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ACROSS THE ATLANTIC IN. o © Si a g bo] Cire TE BG ji | i | 1 THE WORLDS. LARGEST DINING ROOM I60 FT. LONG ¥ i HS FT. WIDE: 30 FT. HIGH 3 i a A ai i [EMPIRE ST gees {O18 FT ‘ 1004 FT. W.L., RUDDER WEIGHT" a 40 TONS SE ays A SS EACH PROPELLER cre ome Mine s 200.000 HP ENGI 35 TONS 50000 HP PER PROPELLER SHAFT Roe ENGINES RUBBER CUSHIONED ENGLAND’ HEN England’s giant liner, the Queen ` Mary drops her anchors at quarantine, 32 tons of steel will grapple the mud bottom of New York Bay and swing her against the tide on 145 tons of massive steel chain. Captain Sir Edgar Britton, commanding her, says she is a “good sound job.” But what strikes one most is the loveliness of her im- mense presence. For she is a great lady, Glasgow born and bred to follow the tradi- tions of her ancestry—safety, comfort, sea- kindliness, regular arrival and departure, and speed. As speed queen hostess to 3,500 persons, passengers and crew, she has the most powerful engines afloat, cushioned as in an automobile, with the engine room To reach the crow’s nest (above), the lookouts must climb 110 iron rungs inside the hollow steel foremast. For first time in any ship the crow’s nest is elaborately fitted with modern devices. There are telephonic connections to the bridge below, and in addition to the glass weather screens, electric heaters keep the lookouts warm in winter, 46

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EACH FUNNEL LARGER IN DIAMETER THAN HUDSON TUNNEL, 4-MAIN TURBINES CAN BE OPERATED INDEPENDENTLY CROWS NEST ELECTRICALLY |+ HEATED ~ AAN AO MILES OF FREIGHT CARS TO HAUL HER WEIGHT LA COMPLETE DUPLICATION OF STEERING GEAR 1004 FT. . NR space BETWEEN INNER AND OUTER BOTTOMS WILL PERMIT MAN TO WALK ERECT pcr GIANT _ “sprung” to eliminate the least vibration. Her ‘single reduction geared turbines develop 200,000 horsepower and operate four 35-ton propellers. She is 1,018 feet long, 118 feet wide, 135 feet high from her keel to the top of her superstructure, and she displaces 83,000 tons of sea water. - Should her double hull, in which a man can walk erect, be punctured, any one or all of 37 watertight bulkheads would close. Her 24 all-steel unsinkable lifeboats carry 145 passengers each. There are 30,000 electric lights to give her illumination, 50 miles of plumbing, 21 elevators, special garages, a shopping center, gymnasium, cafes, Ke 5 BOAT IN > LOWERING FOR LOWERING AND {HOISTING o7 EAN PUTS TO SEA lounges and even a kennel deck for dogs. Strength, sea-kindliness and ease of move- ment through rough water are built into Queen Mary’s knife-edge bow and all under- water “streamlining,” to keep her steady on the rough North Atlantic and stifle the pounding of the tremendous following seas of the eastern passage. And if you tune in Singing Sam’s deep bass final note of “Asleep In The Deep,” you will have an excellent idea of how the ship’s sirens sound. The deep, soft, far-carrying The 24 lifeboats are power-driven. Davits swing out and lower the boats with full TRICING loads of passengers. PENDANTS SECTION ‘SUN DECK | LENGTH OF EACH LIFEBOAT 36 FT. SIN SPEED 6 KNOTS BEAM I2 FT, 7IN BOAT E BE ENGINE peas HEATING SAS! i j PLUG "i ak PLUGGED IN ENGINE HEATER CONNECTION KEEPS MOTOR WARM IN COLD WEATHER EACH ANCHOR WEIGHS AS WATER LINE

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NEW GERMAN AIRSHIP D-LZ-129

Comparison of the largest se dirigible and greatest Aa à ship in passénger space. \ ACCOMMODATION =

p ER

sA tone can be clearly heard for ten miles, yet its mellow “A” depth will not disturb the passengers. The great restaurant on “C-Deck” accom- modates 815 diners and is the largest room of its kind ever built into a ship. It is 160 feet long, runs the full width of the beam, and towers up through three decks, In the vast adjoining kitchens, among other labor-sav- ing devices, is Robot Molly, the mechanical e R : Be Be dishwasher. She can wash, rinse, polish and TELEGRAPHS sue FOOR MAN TRENES GRA : sterilize thousands of dishes an hour, but ; ~ EEA EE NDEPeNDENTIN 2 - never break even the most fragile china cup. isi And there are 200,000 pieces of china and | ee 100,000 items of tableware to keep clean. pea SHON ST Diners in this restaurant can look up at a

oe Se Me ss i painting of the North Atlantic and see a el aa miniature Queen Mary duplicating the course of the mother ship. Thus the exact latitude [Continued on page 144] SAGE ¢ warn a“ ONS AUIS LY BORA CUAL DER Tal Te ROS woh st a HOW THE WATCH- ` : << KEEPING OFFICERS ON | The diagram shows the com- THE BRIDGE ARE PROTECTE! plete duplication of Queen : “ROM Mary’s steeting gear and how the rudder power is applied.

The design of the wind screen sends an invisible tent of wind over bridge officers.

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Motor Truck Picks Up Freight Car To Deliver Goods ie ORDER that bulk rail shipments could be delivered to their destination without reloading the German railways have placed into service special semi-trailer trucks. which ean deliver a loaded freight car to the most remote locality. The trailer is provided with rails so that it may be backed to a siding where a switch engine pushes the car on board. The wheels of the car are then locked and the truck starts on its overland journey. Upon reaching the destination a hydraulic lift is brought into service and the car tilted so that the bulk contents, such as grain or coal, ean be removed rapidly. Radio Station Built In Top Hat Constructed for. broad- casting special features the tiny broadcasting sta- tion demonstrated here by George Hicks is hid- den in his top hat. The power supply consists of miniature cells mounted in a belt about the waist. The rod protruding from hat serves as the antenna. Signals transmitted by transmitter ate picked up by a mobile receiver and tebroadcasted to station. At left is sketch of re- ceiver and power supply. MODULATOR ESIGNED for special broadcast purposes by O. B. Hanson, Chief Engineer for the National Broadcasting Company, a tiny mi- crowave broadcasting station fits in the crown of the announcer’s hat. Powered by a minia- ture power supply the transmitter has a broadcasting range of one-quarter mile. Its unusual construction permits announcers to mingle in a crowd without the use of a cable between the mobile apparatus and his micro- phone. Comments made by the announcer are picked up by a microwave receiver. This specially designed trailer truck now in use by German railways delivers rail shipments to remote places where service is not available. A hydraulic lift tilts car for unloading. New Bus Features Aluminum Body ESIGNED by a young Spokane, Wash- ington manufacturer, a new aluminum bus may revolutionize the motor coach in- dustry. The bus, of streamline design and powered by a V-8 Ford engine installed in the rear of the chassis, reduces the weight over similar coaches by two tons. The con- struction of the bus is such that loaded or empty one-third of its weight is at the front and two-thirds at the rear so as to insure maximum traction at all times. Featuring a body constructed of aluminum instead of the usual steel, this modern bus reduces gross weight by two tons. A V-8 Ford motor is sufficient to power the new motor coach. 49

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by TOM MURRAY ILLIAN LEITZEL, the world’s greatest lady aerialist, had just finished her 100th muscle grind in the high dome of a Copen- hagen theater and the huge crowd of spectators were applauding loudly. Suddenly hundreds of eyes saw a slim graceful form . plunging downward. The fall was not a | part of the woman’s act. She had fallen i} to her death. ‘‘Crystalization’”’ had weakened a swivel in her rigging, and once again this mysterious deterioration of steel had claimed another circus per- former; this time one of the best and most loved artists of the sawdust arena. Science has been unable to cope with this steel granulation and every season one or more. circus performer plunges to his or her death beneath the white tops. Next to the demon crystalization the ‘| biggest problem confronting the circus | performer, and upon which their lives depend, is perfection in mechanical con- Circus performers are trained from- infancy; These skilled high wire artists ate still in their early teens. Photos at right | struction of their various riggings from pinging Bios. > which they perform their many dan- gerous feats. Every bar, swivel, guy wire and metal connection must be abso- lutely accurate in detail and perfect in construction. Hidden defects must be avoided in every piece of mechanism if the man on the flying trapeze is to survive from season to season. Many of the circus performers’ acci- dents are unavoidable, others could be avoided. Weather conditions, especially sudden changes in temperature, affects metal parts of the performers’ paraphernalia causing bolts, rings and steel wires to become brittle. Sometimes during extremely cool weather these metal parts will snap like brittle candy. Apparatus when mounted in several different Above-——-The lives of these artists rests on a small metal swivel. Should this snap they would be hurled to their doom on the sawdust ring fifty feet below. Right—-The Walkmir Troupe take their lives in their own hands to present this daring feat of juggling. 50 -~ Modern Mechanix Hobbies &

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CIRCUS THRI directions from a single ring or other fasten- ing will, at times, create an uneven pressure causing the fastening to snap. This has hap- pened in Madison Square Garden, New York City, where several riggings must be guyed from the same fastenings or ring anchors. As the circus moves from a low altitude to higher country, the aerialist and acrobats must be on the alert to the lightness of the air or they will over-shoot their marks. In high altitudes leaps and turns can be made with less effort than in low altitudes. Many of the leading circus performers make their own performing equipment, de- signing it and then creating it in every mechanical detail. Mechanical perfection, in many cases, is lacking. In some instances bolts and hooks are made too small and not strictly uniform. Inefficient mechanics who do not understand the proper details in con- structing metal aerial equipment, are often responsible for accidents beneath the white tops. : There are several professional manufac- turers of apparatus for circus performers who cater exclusively to this type of business. f [Continued on page 131] Inventions, July, 1936 2 i; NE RRR _ DE B Er ERE eee The success of the human cannon ball stunt was largely due to the mechanical genius of the elder Zacchini, an Italian mining engineer. His five sons have been per- forming this amazing act throughout the world. Phoios copyright by Ringling Bros. Barnum & Bailey Here in the world’s larg- est tent several score of experienced aerial rig- gers are constantly on the alert for faulty bars. 51

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The Jamaica Race Track “electric eye” shown above snaps a picture the instant the winning horse breaks a light beam thrown across the finish line. The lower drawing shows how the end of the race will look to the “electric eye” camera. Tickets Printed On Midget Press ERMAN bus and street car conductors are now using miniature print- ing presses in is- suing transfers and tickets. The machine, slightly larger than a camera, prints the transfer point, destina- tion, price of ticket and other symbols as needed. and transfers can be Tickets printed as needed by this German device. 52 This eliminates punching. Electric Eye Judges Races; Photographs Close Finishes A and impartial judging of neck- and-neck finishes at horse races is made possible by means of a new “electric eye” working in co-operation with a camera. The mechanical judge was placed in operation for the first time at the Jamaica Race Track on Long Island. f .A wall of light is projected across the track at the finish line, striking upon the electric eye. The first horse to break the wall of light sets off a relay in the “electric eye” which in. turn clicks the camera. A pictorial record is thus made which can be studied at leisure, eliminating hasty decisions. Robot Synchronizes Plane Motors Mr. Harris is shown here with his airplane motor syn- chronizer. When all three motors are revolving in unison, three dots in dial appear stationary. Any change in a motor’s speed will be shown by a corresponding movement of its dot. REVOLVING disk which seems to stop revolving when the engines of a tri- motored plane are operating in unison has been invented by Luther Harris of Central Airlines. The instrument permits pilots to synchronize their motors to within a fraction of a revolution per minute. Vibration is eliminated and air sickness greatly reduced. Modern Mechanix Hobbies &

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Young Detective Smashes Police Ring Inside lamps, beneath chairs and under desks Jamie rigged his tell- tale microphones. These led to powerful dicta- his as the Ticker tape unfolded a story of crime for Wallace Jamie. He rigged the ticker to tele- phone lines, and when a num- ber was dialed, it was tapped off by the ticker detective. Mo an officer saw stocky, youthful Wallace Jamie about the St. Paul police station the late winter and early spring of 1935 and laughed up their sleeves at his ac- tivities. By midsummer that year, however, they wished sincerely in their hearts they never had heard of him. For Wallace Jamie was the kind of a kid who liked to`play “policeman” with a ven- geance as a lad and then grew up to continue playing the game—but playing it for keeps. Before he finished, almost a score of the officers were under indictment and awaiting trial for alleged neglect of duty. Wallace Jamie went to St. Paul at the be- hest of Howard Kahn, embattled editor of the St. Paul Daily News, and a World War veteran of the French army, and Henry E. Warren, Commissioner: of Public Safety, who, at that time, had been just elected to office. St. Paul was rankling under label of “Poison Spot of Crime,” placed upon it by Attorney General Homer Cummings. The three men determined that the city must be cleaned up. In secret conference, it was decided. that 27-year-old Jamie, who had majored in police administration and criminal detection at the Inventions, July, 1936 Commissioner Warren, left, and Jamie inspect the evidence. hand “mechanical phones for recording. Warren has in pamograph, known stool pigeon.” the Wallace Jamie, the 27-year-old criminologist who broke up the vice ring in the St. Paul police department, is shown here with an aluminum recording of telephone conversations between the police and members of the city’s underworld. University . of Chicago and Northwestern University, would pose as an efficiency ex- pert making a survey of police methods. He was given an office in the new public safety building on the floor below Warren’s and took with him secret operators whom Kahn had brought to the city previously. To the coppers about the building, he became just another “smart college guy” whose duty it was to go to work on a report that would soon be forgotten. First he tapped telephone lines. It was decided next to supplement the tapped telephones with three dictaphones— new, compact, modern, highly sensitive in- ‘struments—the position of which should be changed from time to time. These were placed [Continued on page 127] 53

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Full speed ahead in an Soap Box Racer! This “trike” wheeled speedster is second prize in the contest. THE PRIZES First Prize—A scientifically designed Soap Box Racer, complete with Doenut tired wheels. Second Prize—A Soap Box Racer ‘of same design as above, complete with ball-bearing tricycle wheels. Third Prize—A set of four Mussel- man Doenut tired wheels. a RADIUS OF SL MOVEMENT & ` ATA. —= ON TURNS i le NORMAL TREAD -> POOR FRONTAL AREA ~- OR FLAT PLATE RESISTANCE 1S IMPORTANT. SKETCH ON RIGHT CONTRASTS GOOD DESIGN & POOR POOR TREADLESSENS AS WHEELS ARE TURNED f em CONSTANT > i > TREAD o NS. EASIERTOALIGN NO EFFECT WHATSOEVER UNDER 40M.PH. There is a right and wrong to everything, including soap box racets. Right, in this case, means increased speed and victory. 54 THE RULES l. From the letters contained in the three words "Hobbies and Inven- tions" make as many words as possi- ble. No other letters can be used. . List all words in alphabetical order using pen and ink or a typewriter. Neatness will be considered by the judges, but elaborate entries will not influence their decisions. 2. Proper names, foreign words, and slang do not count. 3. In fifty words or less write a letter describing the article you like best in this issue, and what type of article you would like to see most in a future issue. WO Soap Box Racers! A set of Mussel- man doenut tired wheels! These are the three prizes in MM’s Soap Box Racer contest. First prize is a scientifically designed racer, fully equipped with doenut tired wheels! Second prize is a racer of the same design, equipped with ball bearing tricycle wheels! And the third prize is a set of four Musselman doenut tires and wheels. The winning of one of these prizes will make you the envy of all the boys in the neighborhood, and will be sure to put you right up in the front ranks in the pushmobile speed contests. To compete for one of these big prizes, all you have to do is write as many words as you can from the letters contained in three words “Hobbies and Inventions.” Proper names, slang, or foreign words will not count. Then write a fifty-word letter or less describing the article you liked best in this issue and why, and what kind of an article you would like to see most in a future issue. Mail your letter and list of words to the Soap Box Derby Contest Editor, Mopzrn Mrcuanix Hossirs & INVENTIONS, Greenwich, Conn., before June 24, Readers submitting the most words and Modern Mechanix Hobbies &

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RACING CAR 4. Write your name and address plainly on your entry. No entries will be returned. 5. Webster's New International Dic- tionary will be used as reference in cases of disputed words. 6 The editors of this magazine will be the judges. Their decisions are final. 7. This contest is open to everyone ex- cept employees of Modern Mechanix Publishing Co. and their families. 8. You don't have to buy a copy of this magazine or be a subscriber to enter the contest. 9. Mail your entry to the Soap Box Derby Contest Editor, Modern Mechanix Publishing: Ço., Greenwich, Conn. Entries for the contest must be post- | marked on or before June 24, 1936. who fulfill other requirements listed in the rules will be awarded the prizes. Soap Box Racers built on sound engineering principles will prove to be the winners in the Soap Box Derbies to be held all over the country this year. Gravity furnishes the power, but science must furnish the speed. Naturally, the builder of the winning car will need to exercise considerable ingenuity in getting together his soap box derby en- trant. It is with the idea of showing what has been done, and what can be done that this article is written. All Derbies are rolling races. Pushing is not allowed. Consequently the car will have to be a good coaster before all else. This indicates ball bearings, perfect wheel align- ment, perfect braking and smooth steering control. Indicated also are a rather light weight, perfect load distribution approaching the ideal of weight equally divided on all four wheels, and as little wind resistance as pos- sible. While the latter is not of much mo- Inventions, July, 1936 The third prize. Engineers are agreed that low pres- sure, pneumatic tired wheels are fastest for soap box racers. Winner of third place in MM’s contest will receive a full set of four. Here is the first prize in the MM Soap Box Racer Word Contest. This de luxe scientifical- ly designed, doenut tired racer is fin- ished ‘in cream and navy blue color with cable brakes. 55

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Small Details Decide Soap Box Derby Winners Fiet ye STRAP IRON EUROPEAN STYLE ; : FRAMES STRAP IRON THEY TO 1/2 [a BRACKETS G.R.S. AXLE \ 5 ities: ; 2" x ae | $ HUB FITS INSIDE FRAME. : “a ade BALL: BEARINGS - PRESS BRAKE PEDAL. oe t. FIG.3: SUGGESTED FIT INTO. 11/8” PIPE k DETAILS ; e \ MOUNTING FOR BI- : ; Ñ . : i LOCK HUB ON: f g FINISH. RIM OFF ; ; , HANGER 7 cur our W: ROUNDED Here a youthful builder is fastening WITH A YW; 1/2" PIPE down the brake beam carriage. COMPASS. g x Se Also is shown the way in which rear axle is housed. in axle beam. Such an axle cannot get out of line. EACH END)

ee se Eoy sies D AJW will wobble in tracking. DETAIL re SAPE BEOOR Posi TON OE The best wheel from the 3/4" 5-PLY ` COLUMN standpoint of the derby builder is the CARRIAGE som balloon doenut tired wheel. These ae < rrame wheels are ball-bearing, easy to install, BEAM ENGAGES WHEEL TIRE and their soft pneumatic nature will absorb shocks and do away with the springing function, making entire total steernccocumn weight of car practically sprung weight. ALL FRAME. SEATS IN CROSS PIECE + . A D MENEER OF aa ee OO The next best thing is what is RETURN SPRING Ine Ale. FIR © (erce roa) known as the 14” diameter “trike” or STRAP IRON HANGER: s s a CROSS MEMBERS ~ FASTEN FROM BRAKE BEAM~1 k’ x 15e! FIR "SIDES WITH COUNTERSUNKLAGSCRS CHASSIS DETAILS tricycle wheel. This wheel is much == stouter than the ordinary baby buggy The chassis, together with steering and brake details are shown here. wheel, and can be had in any eycle The steering wheel can be made of five-ply wood or two layers of , three-ply. Fir is used for frames and three-ply wood for floor. shop. Such a wheel wouldn’t stand much 56 Modern Mechanix Hobbies &

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Drawings Show Strength, Speed of MM Racer ee es <a 1/2" PIPE BOLT me SASt CORD FIGS USUAL PE WAGON-STEERING 4 ae POURED LEAD ANCHORS CONE STAY. ROD S$ CARRIAGE BOLT AND WASHERS

The flange of the front axle cone is sawed off and filed round to fit hole as shown in drawing above. Lead is poured around it for a tight fit. of a chance of winning a national event with its flat, long greased bearing surface, so we must needs make it a ball-bearing job. This can be done, in the rear wheels, by threading the 3%” cold rolled steel axle for a length that will accommodate the hub and locknuts. The wheel is bolted securely to the axle. The axle turns in ball bearings that are inserted in a pipe nipple. See Figure 4, These bearings are “trike” bearings, costing from 12 cents to 25 cents each. You will find you can insert them snugly in a 14%” outside diameter water or gas pipe nipple. The end. of the axle is washered and pinned. The nipple is set in a Inventions, July, 1936 KING PINS OF 1/2". PIPE TEES A NIPPLES WITH DRILL ROD PINS $ SET IN POURED LEAD i, WOODEN DRUM „a PULLEY ` AIRPLANE 7 SPINDLE / RADIUS ROD. _ORILL OUT FOR: BIKE CONE MODEL "A" BRAKE TOGGLE CONE CUT IN TWO SEE CROSS- SECTION” * B STRAP IRON Figg "ALL. BALL BEARING * AUTO TYPE SLOT PERMITS a SPINDL] ADJUSTMENTS R yas 2C NT AXLE TO CAMBER WHEEL EMPLOYED. STEERING ARM

groove in a 15¢”x15s” fir axle (commonly called 2x2) and is retained by %”x114” strap iron. clips bolted together as shown with s. a. e. auto bolts costing about 3 cents each, obtainable at auto supply houses. This as- sembly gives a stout wheel, of perfect align- [Continued on page 132] The completed assembly of the MM Soap Box racer is shown in this phantom drawing. 22 ga. galvanized sheet iron is used to form the hood. 3/4" PLYWOOD SEAT BACK 7 3/4" #6 F.H. d SCREWS GENERAL ASSEMBLY AND CONSTRUCTION DRAWING OF THE CAR = DESCRIBED — "3/4" PLYWOOD DASH 12" PIPE-SEE DETAIL\ FRAME WITH PLYWOOD SKETCH OF STEERING WHEEL AND COLUMN | HERE TO FORM LOW SEAT

22 GA. GALVANIZED SHEET IRON HOQD FASTEN TỌ SIDES AND FORMERS WITH SHINGLE NAILS 1/4" PLYWOOD FLOOR &SIDES SEE FIG.9 FOR DETAIL OF AUTO TYPE STEERING ASSEMBLY AND BALL BEARING KING PINS “MUSSELMAN* 10" X 23/4" DOENUT~ TIRED BALL BEARING WHEEL 57

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Rocket Launches New Type Lifeboat From Ship’s Deck Nanni of Brooklyn. Nanni here demonstrates how his 10 passenger, steel lifeboat will be launched. Rubber cushions will reduce starting and landing shock. The boat cannot turn or twist in the air. “Family Bus” Carries 11 Passengers HE “family bus” now becomes a fact, and not just a term applied to the car in the family garage. One of the first of these ex- tended Ford cars was purchased by Wallace Beery for use as a private bus and station wagon. It is 22 feet long and carries 11 passengers in four wide seats. Brakes are of the air booster type. Wallace Beery is shown here with his new “family bus.” It carries 11 passengers, has four wide seats, air booster brakes, De Palma safety rims for front tires and a Ford motor. 58 VALVE CONTROLS FLOW OF LIQUID GAS —— LIQUID GAS CONTAINER GAS EXPANSION CHAMBER “RIGID STEEL ae t $s LAUNCHING DAVIT REVOLVES IN 95 DEGREE ARC | Rocket principles are employed in launching this new type lifeboat invented by Menotti é _ Non-perishable liquid gas explodes when released into the expansion chamber, discharging the boat as shown in the diagram pictured at right. ROCKET type lifeboat which can be shot over the side of the ship instead of being slowly launched from davits has been in- vented by Menotti Nanni, of Brooklyn, N. Y In tests conducted on models, he has shown that the boat will not turn or twist in the air. In the full size life boats rubber cushions and other supports will take up the initial jolt as the boat leaves the deck, while the forward momentum coupled with the hull design will eliminate shock as the boat skims into the water. The boats will be held in place on deck by two steel plungers running through tubes in the hull parallel to the keel. In launching the plungers are pivoted over the side of the ship, and liquid gas released into the tubes. This explodes against the plungers and the lifeboat is catapulted into the sea. Nanni took his family with him in a demonstration May 10. Sootless Cook Stove Burns Sawdust AW dust, shavings, peat, old leaves or any waste ma- terial forms the fuel for a new slow - burning stove invented in Germany. Stove consumes every- thing, producing a uniform heat without soot. Sawdust forms the fuel for this slow-burning German cook stove. It produces no soot or smoke. Modern Mechanix Hebbies &

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MOVIE CARTOONS Gain THIRD Dimension Max Fleischer, cartoonist, inventor, mechanic and animated movie director, confers with Pudgy, one of his famous characters. Three-dimensional animat- ed cartoons are produced ‘on this miniature set. The houses are not built to scale, the buildings in the foreground being much THIS SECTION OF SET (OUTER EDGE) TRAVELS. PAST LENS MORE RAPIDLY È: THAN SECTION NEAR PIVOT MESES 4 i GEARING BY N shorter and wider than WHICH TABLE those nearer the pivot. The 1S MOVED camera perspective rem- edies this and the result is a picture creating all the illusion of three dimen- [METER TO S ie sions. Cartoon character is MOVEMENT OF H TABLE o = A WITH FILM placed in a slide mounted between camera and set. CIRCULAR REVOLVING ~ TABLE WHICH MOVES ` SET IN FRONT OF LENS Popeye cartoon courtesy of King Features AX FLEISCHER worked a full year to produce 250 feet of motion picture film on one of the first animated cartoons ever to reach the silver screen. Alone, he made thousands of drawings, wrote the story, and did the photography. The animated cartoon was “Out of the Ink Well.” It made movie history just after the World War. Today he has a staff of 225 people who turn cut a 650-foot animated cartoon every ten days. All of them are in sound, many in color and, latest of all, with three dimensions. The famous “Popeye the Sailor” animateds are leaders in the field; “Betty Boop,” “Ko- Ko the Klown,” and the familiar Screen Songs with the famous bouncing ball are known to every movie-goer. They are re- leased through Paramount Pictures Corpora- tion. Max Fleischer’s story reveals the almost unfimited opportunities which await the man who adopts cartooning as a profession. He began his career as a $2-a-week errand boy in the art department of the Brooklyn Eagle, Inventions, July, 1936 PIVOT AROUND WHICH YEO 1D TABLE REVOLVES -—— PIVOT iS 6 FT. FOR 6 FT. INFINITY “el FROM Popeye, Olive Oyi and Wimpy, three remark- able characters created by E. C. Segar, lend themselves admirably to Max Fleischer’s movies. CUT-OUT The camera equipment necessary to film a three- dimension animated car- toon weighs two tons. The character is drawn on cellu- loid through which camera picks up the background. WHAT a CAMERA SEES later becoming cartoonist on that paper. One of his early cartoon strips was “E. K. Sposher, the Kodak Fiend.” He has always been mechanically inclined and of an inventive disposition. His latest patent gives an effect of three dimensions to cartoons. After the drawings are completed they are photographed in sequence, usually against a water color background which remains sta- tionary, the cartoon characters being super- imposed upon it in several celluloid layers. It is just at this point that Mr. Fleischer’s new three-dimensional illusion figures. Upon a table are placed miniature sets, constructed with microscopie accuracy. The sets are built in segments shaped like a piece of pie. They are not built to scale—this is [Continued on page 132] 59

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Brig. Gen. H. H. ARNOLD After months of intensive ground schooling, the student pilot takes off on a dual jnstruction flight. FLIGHTS QN MILES) The spectacular pro- gress of aviation is clearly shown in these charts. No other in- dustry can show such great advances. o 1908 1913 1918 1923 1928 1933 ' Brigadier General H. H. Arnold, former aviation editor of this magazine, and Major Ira Eaker, twa of America’s greatest pilots, men who have been in aviation since its birth, have collaborated in writing “This Flying Game,” a 268-page book dealing with all phases of aviation. Excerpts from the twelfth chapter of this book, published by Funk and Wagnalls Co., are reprinted here through the kind permission of the authors and publisher. VIATION is an industry. It includes many trades and a few professions within its extensive realm. In addition, many of the old and long-established trades and professions have fresh pastures opened up to them as a direct result of this new industry and its demands and opportunities. The uninitiated are prone to look upon aviation as merely a collection of pilots. Flying machines and flying men form the 60 Aviation, the giant infant of Industry, challenges youth to find jobs within its many fields. Where? How? Brig. Gen. H. H. Arnold, former aviation editor of MM, and Major Ira Eaker tell you in this chapter of their book, “This Flying Game,” published by Funk and Wagnalls. The young pilot, hav- ing graduated from dual instruction, is ready for his first solo. Parachuting. It is not as - dangerous as it looks, experienced jumpers claim. Parachutes are life rafts of aviation. Charts and U, $. Army Air Corps, photos ‘reprinted by courtesy of the Funk and Wagnalls Com- peny. complete popular conception of the industry. Too many of us overlook the many men and the varied types of human occupation re- quired to give these airmen something to ride. Let us outline, briefly, this new field of endeavor; let us follow the tentacles of the octopus and thus learn something of the mag- nitude of the creature. On a western airport stands a magnificent plane, ready for a mad dash across the con- tinent tomorrow. Consider that plane. It is a complete vessel but it is composed of a mul- titude of co-related parts, accessories and complete mechanical assemblies. That ma- chine took a year in the building. First it originated in the mind of an airplane de- signer; then it was transferred to plotting board by skilled draftsmen. These blue- prints, upon being reproduced in manifold and transferred to the factory floor, set more than a hundred men at work on the plane alone. Before actual work can begin, a model of wood, complete in every detail, called a mock-up, must be built up by carpenters and skilled wood workers. This mock-up is then deliyered to the metal workers, who dupli- cate it in dural, since the fuselage or body of Modern Mechanix Hobbies &

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Surveys The FLYING Game Here is Brigadier General H. H. Arnold, co-author of this article and assistant chief of the United States Army Air Corps. All phases of aviation are covered by Brig. Gen. Arnold and his collaborator, Major Ira Eaker, in their book. the structure will probably be entirely of this material. This requires work by practically every type of artisan known to the metal trades—rollers, cutters, riveters, and formers. After the completed fuselage is rolled upon the assembly floor its power-plant installation begins. Other mechanics install an instru- ment board, carrying more than twenty in- struments and gauges. Others install win- dows, sound-proof the cabin, and complete the whole with seats and upholstery. The engine comes to the airplane factory as a complete assembly, but its construction has required an even greater number of skilled designers, engineers and mechanics. After the plane is completely constructed it is rolled onto the flying field, where line mechanics begin an engine run-in and tuning-up. The test pilot next takes the plane into the air for its trial flight. After the first, there will be slight adjustments of controls, followed by four to ten hours of routine flying to “shake down” the completed article, insuring its satisfactory performance. Special gasoline and lubricating oil must be placed aboard. These have been prepared for the air industry after a long series of Inventions, July, 1936 Aerial photography comprises no small part in the training of tomorrow’s pilots. In war or peace this training is invaluable. For almost every hour in the air the student-pilot spends at least 10 on the ground, learning aviation from A to Z. Here two are mastering the art of folding a silk parachute. tests, as automobile products are not satis- factory for the airplane engine; thus an allied industry is brought early into the picture. The plane is located in a flying field especially prepared as a home and landing site for aircraft. This complete installation, with its hangars, runways, shops, operation buildings, and waiting-rooms probably cost more than two million dollars, required a year to build, and made work for several hundred men of many trades, running through the gamut of the building industry. Before the plane takes off, the pilot will receive complete weather reports gleaned over radio and wire all along his proposed course. These will be interpreted and pre- pared in final form by skilled meteor- ologists. The pilot tunes in his radio for contact with the ground organizations along the airway he is to fly. His course is not marked by [Continued on page 133] 61

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New Aluminum Plane Claimed Cleanest In Design Capable of speeds exceeding 160 m.p.h., this new aluminum and steel monoplane is claimed to be the “cleanest” in design of modern aircraft. Plane is powered by a 17 cylinder engine. Canoe, Bicycle Fold for ‘Traveling FTER constructing what might well be called a vestpocket bicycle the French inventor, Louvet, realized that a craft for water travel, featuring the collapsible feature of the bicycle, was also needed. After several weeks of planning and building Mr. Louvet emerged from his workshop with a truly fold- ing canoe. The odd craft consisted of three sections easily assembled with only ten screws. A rubber lining prevents the boat from sinking once it is in the water. After designing a collapsible bicycle for land travel, French inventor, Louvet, shown above, set to work on a folding craft for water travel. A small trailer hauls folded cance overland. 62 ONSTRUCTED of Alclad, an aluminum alloy, and powered by a 285-horsepower Jacobs engine a new monoplane recently tested at Tulsa, Oklahoma, is claimed by its builders to be the cleanest in design of any plane yet to be constructed. Featuring a raked rudder post and an un- usually deep fin area the plane is capable of speeds in excess of 160 miles per hour. The design permits the plane to land at a speed of 45 miles per hour in perfect safety. Sufficient gasoline can be carried for flights of 800 miles. The framework of the ship is of reinforced steel tubing covered with sheets of the thin, but durable, Alclad metal. Special insulation materials are employed to keep all motor noise from the cabin during flight. Chef Fashions Caricatures In Toast These novel caricatures have been fashioned from toasted bread. Louis Strakes, New York chef, is shown applying finishing touches to a group representing notables in politics. EW people would find an ambition for developing art talent in toast yet Louis Strakes, a New York restaurant chef, has developed striking cariactures from this common breakfast item. Using people prominent in the world news Mr. Strakes begins the caricatures by browning slices of bread to various shades. The bread is then cut into small pieces and assembled to form the character to be depicted. When the figure has been completed it is. mounted on a base consisting of four pieces of toasted bread. Toothpicks are used to hold the caricatures together. In a few months Mr. Strakes has become world famous for his unusual craft. Modern Mechanix Hobbies &

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GIRO PLANE FLIES N AUTOGIRO plane which is expected to fly without the aid of a propeller has been designed by W., Laurence Le Page, a Phila- delphia consulting engineer. The odd craft has been constructed in model form. It is wingless. Tests in the wind tunnels of New York University have been satisfactory. In Mr. Le Page’s plane there is no vertical propeller. The rotor supplies both the lift and forward motion. In order that the craft will fly in a true course parallel vanes are located both forward and back of the fuselage. Steer- ing is accomplished by means of special rudders extending from the rear fins. . Device Measures Body Heat of Bees Standing before his thermo electric apparatus at Brown Uni- versity, Professor Ivan R. Taylor, of the faculty, points out instruments used in recording body heat of various insects. N INSTRUMENT so sensitive that it will record the body heat of bee moths has been perfected by Ivan R. Taylor of the Biology Department at Brown University. Operating on the thermo electric principle the apparatus permits the University scientists to make a careful study of the changes that take place when the insect changes into a moth. Prof. Taylor and his associates have learned that it would take four bee mothpupae seven and one-half days to produce enough body heat to raise the temperature of a thimble of water from freezing to the point of boiling. This is the first time instruments have been used to explain the phenomena. Inventions, July, 1936 Without PROPELLER W. Laurence Le Page, inventor of the revolutionary autogiro, is shown with models of the original and his improved craft. Mr. Le Page is holding his plane above model of earlier type. Athlete Invents Novel Land Canoe PERATED by oars and capable of speeds of 30 miles per hour, a novel land canoe has been invented by Umberto Bozzoli, an Italian athlete, for keeping in trim. Effort applied to the oars is transmitted to a special gear arrangement which drives the rear wheels of the vehicle. Steering is accom- plished by pedals located in the floor of the device so that rowing is not interrupted. Bringing the features of scull racing to dry land is made possible with this land canoe, the invention of an Italian. Vehicle is propelled by oars which actuate a gear mechanism. 63

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The DAREDEVIL DUB— The speed maniac is poison to veteran race by FRED GILMAN JOPP pilots, for he is the driver who has no regard age for his own life or the lives of others. His misguided daring is exposed in these pages. Above—The start of the annual Automobile Race Classic at the Indianapolis Speedway. This famous brick saucer has long been the thrill crucible in which motor cars ate tes and is the track responsible for breeding the mechanically- perfect, beautifully-appointed car that you drive today. NDIANAPOLIS! Stands and infield are packed with high-tension humanity. Everywhere is the multi-colored hue of race day. The aroma.of crankcase oil is in the air, with all eyes glued to the gigantic brick saucer, where the steel whippets are receiving their final tuning. “Look!” shouts someone. “There is Kelly Petillo. If the jinx doesn’t ride with him, he’ll win again this year.” “And there is ‘Wild Bill’ Cummings over there,” says his companion. “Boy, does he roll a fast bus?” The cars are pushed into starting posi- tion, and telegraph keys and press type- writers leap into high and begin their On the dirt tracks, those high-banked as shown in the above feverish “tick-tack” to'a waiting world. illustration, the usual skid brings the spinning car down The referee dispenses eloquent caution, eset ence, i pilot is aom injured Ghen “weaving the apron’ then drops his flag. The swarm of motored It is the outside spin that worries him, for centrifugal force is projectiles shoot forward. pushing him outward. When this latter spin occurs on a banked A SF 5 curve, over he goes in a terrific impact which may mean death, Despite your protracted anticipation, 64 Modern Mechanix Hobbies &

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The pilot is sa d Ein’ e dora and sio im fee y down. is d X ing wheel Death comes with dra- matic suddenness to the speedway. Whirled out of his machine, as this actual photograph from a Universal Newsreel shows, this pilot fell to the track in front of bis still-rolling car, and it crushed out his life. the start is unexpected. A blast of violent, all-swallowing noise from engines suddenly accelerated smites your ears with a pang of sharply-enhanced apprehension. The roar from unleashed cylinders swells and broad- ens, then temporarily breaks as the pilots lift heavy feet to ease their mounts into the turn. They circle the track and enter the straight- away in perfect start formation. Again the referee snaps his flag downward, this time with an authoritative jerk, and they are off— to a flying start! There’s Kelly Petillo, Floyd Roberts, Doc MacKenzie and Chet Miller out front, already for these boys qualified for the Champion 100-mile~An-Hour Club by averaging better than “100 miles per” for the entire distance last Decoration Day. And only fourteen Inventions, July, 1936 enough when the rear throws up a wheel, But oe y ynamite whet urding over a densely-packed crowd. MENACE of Auro Racine irt others have had the driving stamina and racing luck to win the Indianapolis Race since it was inaugurated a quarter century ago. Lap after $100 lap the pilots flirt and kid with death, the slipstream flattening them back, ears splitting from the howl of wide- open throttles, and always with eyes front that the curves may not gravity-slap them into the retaining wall. Lap after lap... and look! That skidding car! Those in the stands are out of their seats in a flash, for . . . CRASH!—a tangle of shattered men and cars. It’s happened! It was bound to happen. But why? . Down in the repair pits the attendants don’t ask why. They know—know that a mechanical break in tight quarters shot a veteran pilot out of control, or that a “dub” pilot messed up the race. The “dub” pilot seldom will be found in 65

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RIDING THE RAIL IS RACING'S SUPREME THRILL Above—The veteran pilot at the right has just cracked , the outer rail. The veteran racer behind him slid down to the inside rail, then up again, to be sure to clear the crippled car. the great automobile classic, the 500-mile Indianapolis Speed Contest. He is usually eliminated in the qualification trials. For the “dub” is born, not made. He works his way up the racing ladder from the county fair circuits and professional dirt tracks. AAA officials do everything they can to eliminate him, but no set of judges are infallible, and no group of men, no matter how capable, can determine just what a pilot will do in a dread emergency. They judge his past per- formances, watch him carefully in the speed trials—and hope for the best. For the dub looks like any other pilot on the surface. But inside he is a fatalist, and when it comes his turn to be kissed by the icy lips of Death, he wants to be gripping the wheel of the fastest car in the world, his. feet shoving the accelerator through the floorboards. He is certain of winning every race he enters. In fact, he always has the prize money spent even before the race starts. . But there is no telling just what he ‘will do when Death hovers over the track, because he has an utter disregard for his own life, and the lives of others. One in particular will give you a good idea why veteran pilots call him “dub.” We won’t mention his name, but he certainly 66 The insert at left shows the pilot actually’ “riding the rail” at the Ascot Speedway in Los Angeles, one of the most spectacular dirt tracks. was a driving fool. He had raced on many dirt tracks and—had never won a race. One morning he was showing off speed in practice to a visiting movie star, and he “cracked the rail.” When told he had but a few moments to live, he raised himself on his elbow and summoning all the breath left in his broken body exclaimed with a conviction as impres- sive as it was pitiful, “Tell them the world’s greatest race pilot is dead.” And he was gone. The movie star, who aspired to be- come a pilot himself, was cured then and there. And. now to illustrate how the “dub” works on the track. Statistics prove that the veteran pilot who | has gone through twenty races unhurt, has passed the favorable balance. Then, at any time, his “rubber tired dice” may throw a losing “seven.” But it is seldom he is seri- ously injured. The “dice” went against a veteran pilot one day. The steering knuckle of his car had let go and dumped him out on the track— unconscious. Those veteran pilots coming up behind had acted automatically in the emer- gency and allowed their cars a quick drift and skid up towards the rail to avoid the sprawled out body, but had straightened out [Continued on page 144] Modern Mechanix Hobbies &

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Light Beams Carry Voice; Instrument Boon to Aviation ONVERSATION between airport dis- patchers and pilots, who are about to land, can now be carried on without the use .of the usual short wave equipment. The new apparatus transmits the voice over a light beam which is aimed at the plane. A special photo cell receiver picks up the pulsating light emitted by the light transmitter on the ground and converts it into sound. The light transmitter, the invention of A. A. Arnhym and R. L. Longini, Chicago elec- trical experimenters, is claimed to be simpler in both construction and operation than the instruments now used for handling airport traffic. Robot Develops Film Uniformly Movie film which varies in density, as with the film shown on the left, may be uniformly developed through the use of the ` Densometer shown. Photo cells insure proper developing. ESIGNED for use in motion picture de- veloping laboratories a new machine permits uniform developing through the use of an electric eye densometer. In the past ex- pert photographers were required to watch the film during processing in order that all portions of the film would be uniform in den- sity. Due to eye fatigue even the most skilled film technician would commit many errors in processing a picture. The Densometer elimi- nates all errors and is also five times as fast as a human in doing the work. Inventions, July, 1936 Conversation between pilot and ground crew may be carried on over this light beam transmitter, invention of two Chicago experimenters. Electric eyes form the heart of instrument. Radio Listens In On Phone Calls N ELECTRICAL eavesdropper, the in- vention of a Washington, D. C., man, Samuel S. Hixon, permits the listening in on phone conversations without connecting to the line. The device, operating on the radio principle, is capable of picking up conver- sation from phone wires within a radius of twenty-five feet without tapping lines. Samuel S. Hixon Washington, D. C. inventor, points out the interesting fea- tures of his telephone eavesdropper. The unusual radio receiv- ing apparatus permits picking up telephone conversation without making any line taps.

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by DAVID A. BROWN at bj à Fe FA A DOZEN outboard racing boats drive wide open toward the starting line as the hollow boom of a gun rolls out over the river. They get away in a straight line, but as they roar down the stretch three boats pull away ahd go into the turn fighting for the advantage, their sterns awash in a shower of spray and their bullet noses bobbing like flat stones skipping over the water. They are rounding the buoy in a bunch when, suddenly, the outside boat, its driver leaning far out over the gunwale to keep it from ledping out of the water, cuts in sharply, drives rhiraculously through a narrow open- 68 SPLITTING the WAVES with the Outboard races are won or lost at the turns. Here is a thrilling bit of action with three contestants rounding a buoy during an outboard regatta. Note how C-476 is cutting in close to take the lead from his two faster competitors. Circle—-At the start of the race the motor digs into the water, carrying the stern down. The driver must balance against this with his weight. ing, and rockets out of the turn a full length ahead of the field. The race isn’t over, but by continuing to outgeneral the pack on the turns and by pushing his tiny seagoing chariot to mile a minute speeds, this dark horse pilot is able to cling to his advantage and to race home a winner. There are few dull moments in any out- board race, but there is little doubt that the greatest thrills come when a field of dare- devil drivers race their boats into a breath- taking turn in their efforts to gain a slight lead. It is agreed, too, by the men who drive these roaring river-comets that most races are decided at the turning buoys. The tendency among boat designers today- is toward shorter and wider boats with little or no freeboard. In fact, most of the boats used are designed with sloping decks which meet the hull. One of the most radical of this latter type is shown on the cover of this maga- Modern Mechanix Hobbies &

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Aquatic sports reach their peak of excite- ment in outboard rac- ing, when sizzling spray fills the air and skill rides the waves to tri- umph over speed. Each year the records go higher. This article tells why and how. zine. Here the hull consists of nothing more than a surf board so designed that all buoy- ancy is provided by the planing action of the boat at high speeds. Two sponsons keep the craft afloat while gathering speed, and also serve to stabilize it on sharp turns. Motors, too, have been greatly improved. Not long ago the speed record for outboard boats was but a little over 25 miles per hour, but today four-cylinder motors which will turn up 6,500 to 7,000 revolutions per minute are used in Class F and Class X,. and the record has been pushed up to 69.383 miles per hour. In fact, even the midget racers—50- pound boats powered with motors of 7% cubic inches piston displacement, with their tiny two-cylinder motors have done better than 33 miles per hour. The beginner at the sport, then, must learn not only how to eliminate the hazards that. exist on the turns, but how to make use of them to gain an advantage. Leading the field, a pilot should hug the buoy as he goes into the turn and swing around it as sharply as possible to block out his opponents. How- ever, if a boat is prevented from taking the inside, the turn may be made so as to bring the boat about close to the buoy and inside of leading opponents as the swing is completed. Often a trailing boat may be maneuvered into the lead in this manner. If a turn is made too sharply, however, excess cavitation—propeller churning up water without developing power—will cause Inventions, July, 1936 STEEL TUBE \ CANTILEVER OUTRIGGERS This radically new motorized surf board may easily establish a new world’s record. WATERLINE ~ AT REST O WATERLINE J T AT SPEED As the boat gathers speed the side sponsons lift clear of the water and the craft skims on the planing board. In turning the sponsons dip into the water, in- suring lateral stability. a loss of speed which will more than off-set the saving in distance traveled. There is also the danger of wind catching the tilted bow and capsizing the boat in a close turn, as well as the possibility of a spill resulting when the outside gunwale dips and catches in the water as the boat slips away from the turn. These accidents may be prevented by moving forward in the cockpit and throwing the weight out across the gunwale on the inside of the turn until the buoy is rounded and the boat is straightened out for the return. River currents also must be carefully gauged. If the motor is throttled down too soon when going into a turn, a strong, adverse current may carry a boat into the buoy and wreck it. There is, too, a danger of being carried far beyond a down stream marker if 69

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STRATEGY Counts in OUTBOARD Racing ad hn Mo z Fe pte eet ac a a Here is a beautiful start in a spirited outboard race. The boats are off at top speed and are already jockeying for posi- tion. Note how drivers are balancing their bouncing crafts. the motor isn’t throttled down soon enough to allow for the drift of a fast current. But there are many more tricks that the experienced hydroplane drivers employ. The majority of races are started by firing a gun ohe minute before the contestants may drive their boats across the line in a running start. At the same time the second hand of a huge clock is started. To gauge their speed so that they can hit the starting line wide open, many drivers time themselves with a stop watch in a fifteen-second run, back from the line. This is done before the race and the point at which the timed run is completed is marked by its relation to some object on shore. The driver then starts from this point when the clock registers fifteen seconds of the starting time, opening up his motor so as to hit the line as the clock hand completes its revolution. These racing starts should be practiced until perfect timing is mastered, for the boat getting away first has a tremendous advan- tage. Jumping the clock is penalized by re- quiring the offending driver to turn and re- cross the line, but since anything may happen before the end of an outboard race, a penalized pilot should never drop out. Never ride in the wake of another boat. The water will be found too rough for easy [Continued on page 128] 70 t I ' f) ' f} 1 CUTTING IN i y BEHIND TO TAKE 4 LEAD FROM BOAT WHICH SWINGS À WIDE ON TURN 4 ‘ 1 t 1 i f] 1 ‘ t ‘ \ \ \ 4 é ` ie y ps Ss i sy A INSIDE BOAT A HUGGING BUOY ` TO BLOCK OUT ` OPPONENT `Y ` OUTSIDE BOAT HEADS DIRECTLY FOR BUOY AT START TO CUT OUT FAST BOAT COMING ` S w UP ON OUTSIDE AND OPPONENTS CUTTING IN FRONT | OF OPPONENTS TO ® BLOCK THEM OUT OF à THE TURN Above are diagrammed some of the tactics employed by strategists. speed when it winning outboard Brains not discount comes more often to winning than races. Weight thrown 5 on inboard side: is necessary on sharp turns. OUTBOARD CLASSIFICATIONS Maximum Piston Class Displacement of Motor Boat Weight Midget 50 lbs. Minimum for boat and driver 150 Ibs. 100 Ibs. Minimum for boat and driver 250 Ibs. 100 Ibs. Minimum for boat and driver 250 Ibs. 20-30 cu, in. 150 Ibs. 30-40 cu. i 190 Ibs. 50-60 cu. 71% cu. in. 14 cu. i (Inter- national Class) 190 Ibs. 6114 cu. in, and up Modern Mechanix Hobbies &

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Sound Truck Records Street Comments for Repr ondea SING a specially designed sound truck, the German Broadcasting Company picks up the daily comments of various people interviewed on the street, records them on steel tape, and then rebroadcasts them in an evening program called “The Echo of the Day.” In addition to recording interviews on sundry topics, the truck also tunes in secretly on the talk of bystanders and often records remarks incident to fires and accidents. It carries enough steel recording tape to “can” a program lasting one and a half hours. The recording is done by magnetic dis- placements of iron molecules through the use of an electromagnet controlled by the micro- phone current. Using a pickup magnet the recordings are transformed into electrical current fluctuations. These in turn pass through an amplifier and a loudspeaker and are converted into sound impulses. The same wire can be used again and again since another powerful magnet can be used to “wipe off” the previous recording or, in technical language, to bring the iron mole- cules back into their natural position. Big Tank Floated To New Location This new tank with a capacity of 330,000 tons was literally floated to a new site. Engineers etected an earthen dyke, filled it with water then towed the tank to its destination. IACED with the necessity for moving a 330,000-gallon tank to a new site in a short time, engineers of a Canadian oil company decided to take it by the water route. They built hard-packed earthen walls high enough to dyke a canal for the giant tank. The dyke .was then filled three-quarters full of water and the empty tank was floated quickly and safely to its new location. Ordinarily, such a job would have required three weeks. Inventions, July, 1936 ORIVING ROLL enor AMPLIFIER STORAGE ` B08BIN RECORDING MICROPHONE Mane TEST G AMPLIFIER LOUDSPEAKER MICROPHONE Here is sound truck of German Broadcasting Company which is sent daily through the streets of Berlin recording comments and opinion of Everyman, These are rebroadcast later in day. Eye-Glasses Double for Microscope YE-GLASSES which can be used instead of a microscope have been invented by C. Dreisseg of Hamburg, Germany. The glasses obtain their microscopic power from This paper specially treated dark paper. changed the focus of the eye so as to magnify the size of a fixed object. Even mi- nute particles can be distin- guished. The dark paper is en- cased in a leather band which fits snugly around the eyes to ex- clude all possible light rays. The novel glasses are ideal for student use. These novel spectacles can be used instead of a microscope. They their microscopic power specially-processed dark paper. obtain from 71

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Film Expert Expects To Record Perfect Voice Pattern Esih 940 Sele 2 es cel eee ee ee eee, eee ee ee Douglas Shearer predicts his ‘'densitometer” will furnish the perfect pattern for all voices. At top and bottom are tests made of voices of Jeanette MacDonald and Sherwood Eddy. Camera Boasts Fast, Adjustable Lens NEW midget candid camera utilizing 35 mm. motion picture film has been de- veloped by an eastern research organization. Thirty pictures can be taken at one loading. The unit is produced from rich black bakelite molded with a metal back. The lens may be adjusted for close-ups or to any point on the horizon. The camera also has precision adjust- ments for dia- phram openings and shutter speeds. It can be aimed, focused, and a picture Utilizing 35mm. film this camera takes 30 photos in one loading. 72 seconds. snapped in three “DENSITOMETER” developed by Douglas Shearer at the M-G-M studios in Los Angeles puts the sound vibrations of the voice under a microscope and determines exactly what vibrations give certain vocal qualities. The new instrument operates on the prin- ciple of a recording machine. By projecting beams of light the slightest voice fluctuation is magnified 50 times and then photographed on a moving record film. Densitometer tests of Jeanette MacDonald and Sherwood Eddy revealed that both sing an absolutely pure note. Miss MacDonald’s test showed a series of evenly spaced uni- form hills and dales. Eddy’s test showed the same fundamentals spaced four times as far apart. Electric Iron Sprinkles Clothes This iron is partly filled with water which is heated by the same electricity that heats the iron. The clothes are steam moistened from the bottom of the iron as the ironing goes on. $ A NEW type of household electric iron, which looks like other electric irons on the market, sprinkles clothes while it irons them. Part of the iron is filled with water and heated by the same unit that heats the iron. Clothes being pressed are steam moistened from the bottom of the iron as it passes over them. The steam is released as needed by a trigger in the handle. Modern Mechanix Hobbies &

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UNCLE SAM'S MOVIES Record Army Life Their horses groomed to the peak of perfection, all equipment freshly polished, officers and soldiers at Fort Myer, Va., ap- pear before the camera to make a training movie. Hollywood- trained technicians take charge of the Army’s motion picture pro- ductions which serve a two-fold purpose. They keep the public informed on army activities and they instruct raw recruits in the intricacies of army maneuvers. Few movie companies have as efficient a system as the army. This operator of the Signal Corps cinema unit is synchro- nizing sound and picture on the “moviola.” The army has millions of feet of such film dating as far back as 1908. T U. S. Army has gone Hollywood! America’s fighting men. have succumbed to the bright lights of the movie capitol, and now parade on well groomed horses before the eyes of a battery of cameras. In fact, the army is now recognized as one of the largest motion picture organizations in the world. There is one big difference. The army does not deal in make-believe. When a movie is made, the film is either released to the army posts to be used for instructing raw recruits and training personnel, or it is used to keep the public in close touch with what its army is doing towards national defense. Three major segments of the army are in charge of production. These are the Signal Inventions, July, 1936 Here an army training film is being scored. A prepared lec- ture is read into the microphone tg accompany action on the screen. Recruits are quick to follow this method of instruction. Corps, the new GHQ Air Corps, and a special motion picture section of the regular army. Working under these departments are staffs of Hollywood-trained technicians equipped with the finest sound apparatus and cameras. Their film records date back to 1908 when the ‘Wright brothers first showed army officials how to fly at Fort Myer, Va. They include the greatest collection of World War movies in the world as well as “shorts” on almost every phase of army life. At a moment’s notice the air corps can send a camera-equipped plane to any part of the country from any one of 15 photo sections located at major airports. The films are not “romances,” but they insure safety and ade- quate defense for the nation. 73

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Above— Square- sterned canoes for outboards are becoming increas- ingly popular. Right— Lincoln demonstrates in- convenience of carrying oil in five gallon cans. N THE estimation of most seasoned wilder- ness “trippers” there is only one type of boat that really fits into the situation when one is considering an extensive water jaunt and that is the canoe, The canoe of years ago, and somewhat in the present day, were round-bottomed. As a direct result they had but little gripping power on the water surface and would tip and roll from one side to the other. The canoes of today have not only a most de- sirable width at beam, but the bottom is almost flat over a generous portion of its The end of a perfect day. The modern canoeist takes his comfort with him into the woods. Air mattresses are replacing the laborious- ly cut balsam boughs, light tents eliminate lean-tos, while enough dehydrated food for a two weeks’ trip can be conveniently packed into a good-sized knapsack. Outfitting by ROBERT PAGE LINCOLN area. This flat-bottomed effect makes it cling to the surface in a manner that stalls off any real possibility of the canoe’s tipping over. A sixteen-foot canoe is considered of suffi- cient length for two persons. For three persons, however, the so-called guide’s model, eighteen feet in length, is a recommendation. This will permit of four packsacks to be lodged on either side of the canoe, eight in all. Or if a third person is carried, then that person may be seated toward the stern, just forward of the rear thwart. A neck or shoulder yoke to be used on the portages in carrying the canoe is a recom- mendation, especially if you are unfamiliar with carrying the canoe. These simplify portaging at least fifty per cent. Square-sterned canoes are often used in the north and Canada, where the outboard motor is brought into use. This type of canoe is rather heavy, but where there is comparatively little portaging to do it fits in perfectly; has a generous wide bottom, and is excellent to fish out of. The impression is often had that the out- board motor may be used only on a square- sterned canoe. Asa matter of fact, more out- board motors are used on the everyday sharp-bow, sharp-stern canoe than on the square stern. There is a bracket attachment

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CAMPFIRE: A for the Canoe Trip made especially for canoes of this everyday type, as the result of which the motor is lodged on the side of the canoe, near the stern. Both the twin and single type of motor are used on the canoe. With outboard motors now being had as light as 20 pounds up to 30 pounds the excess baggage thus brought along is not overly great. Indeed, by the use of the motor the length of a canoe trip can be stretched out to twice the distance one would go if just paddling. The gasoline and oil are mixed together at the start of the trip, and are preferably carried in square gallon tins. These are then lodged in a packsack especially made for the purpose, cut straight as to side and flat bottom, so that the straight-sided tins will rest side by side in a truly compact fashion. A pack of these tins will weigh a little more, but they are far easier conveyed in this fashion than in the regulation five and ten- gallon cans. While the canoe leads in consideration on a wilderness trip, it should be remembered that all other items in the outfit, each in its department, require thoughtful selection. Regulation shelter tents of ‘the so-called canoe tent or forester type are much favored. It is a requisite that these tents be so made that all windows and openings be covered with netting or bobbinet, to keep out all winged pests, Usually when the occupants of the tent are in for the night the plumber’s candle that is carried for light will reveal any mosquitoes inside. They invariably alight on the canvas, when a touch of the candle flame will singe them. One can thus kill every mosquito inside of the tent. It is necessary to kill each one because one can keep you awake as well as fifty. Since air mattresses and sleeping bags are often used, and are recommended in [Continued on page 122] On portages a neck yoke should be used to simplify the task of carrying your canoe through the brush. If you do not have a regular neck yoke, one can be improvised by lashing your paddles to the thwarts parallel to the gunwales. In this way the carved handgrips of the paddles just fit the shoulders, and by moving the paddles back and forth, you can find the best balancing point.

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Vertical Strawberry Garden Thrives On Chemical Soil Here ate upright boxes filled with chemically treated soil in which strawberries are inserted through holes drilled in the sides. When placed on wheels, boxes can be moved at will. Device Electrocutes Floating Germs METHOD of electrocuting floating germs without pinning the fatal electrodes to their bodies has been worked out by two French physicists. By a special process germs are attracted to high voltage wires. The slightest touch then kills them. The process is expected to be useful in hospitals. French Car Boasts Automatic Top ROADSTER designed by a French manufacturer boasts the latest in auto- matic motor car devices, a top which slides up in position or down into the back of the car without any exertion by the driver. He has only to press a button to set the mechanism in operation. The roadster has an electrical appliance installed in the back to which an accumulator supplies the current. Lk This French roadster is equipped with an automatic top which slides up or down into the back of the car without any effort. The driver simply presses a button next to the steering wheel. 76 ROM Florida comes news of a new port- able strawberry garden designed to effect greater sanitation and to save space. The garden is laid out in a series of vertical ter- races each 10 feet by 4 feet. The plants are inserted in a soil of predetermined chemical content through holes drilled into the sides of upright boxes. The inventor has more than a hundred of these terraces so arranged as to provide a maximum saving in space. Gleaming with green leaves and luscious red strawberries, the garden is now on exhibit in Miami. A yield in excess of planting under ordinary conditions has been forecast. Machine Cools Or Heats Sky Liners Cooling the plane’s interior in the summer and heating it in winter just before it starts out on its trip across the skies is the duty of this four-wheeled electric air conditioner. N AIR conditioner which forces cool air in summer and hot air in winter into a- plane’s cabin forecasts a new era of comfort in air travel. The machine contains a 250-gallon tank filled with calcium brine. In winter, steam- heated air is drawn into and then forced out of the tank into the plane’s interior through a hose. In summer the conditioner connects with a refrigerator through which the brine circulates at 40 below zero. The machine is mounted on four wheels and can be shifted around the airport. Modern Mechanix Hobbies &

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Flexible-Axle Eight-Wheel Truck Rolls Over Rough Roads N UNUSUAL type of mechanized motor transport has been built to carry oil in bulk to the Persian Gulf from oil fields 400 miles distant. Built with eight master wheels, the tanker boasts an oil capacity of 3,700 gallons. Its route will cross a mountain pass 8,000 feet high filled with hairpin bends, cross a snow covered plateaux, and follow a badly conditioned road along the edge of a 1,000-foot precipice, Each wheel is independently mounted and all can be braked simultaneous- ly. The frame, like the human backbone, runs the whole length of the chassis. ` The unusual springing of the craft’s wheels permits it to travel over unusually rough roads with the wheels uniformly distributing the weight at all times. Odd Motorcycle Puzzles Parisians The inventor plans to drive this 3-wheeled motorcycle from Paris to Berlin. Police arreste: im on his first trip out because they had no licensing classification for the vehicle. THREE-WHEELED motorcycle powered by a one horsepower motor will chug along from Paris to Berlin if the plans of Robert Dozin, its inventor, mature. Paris gendarmes arrested Dozin on his first trip out. Because they had no licensing classification for such a vehicle. The cycle is unique in that the driver is caged in by sur- rounding steel bars. Two headlights and a horn are mounted to the bars. The lower bars are also equipped with rests for the driver’s feet. Fastened over a circular steel frame above the front wheel is the motor and gas tank. The vehicle is capable of speeds of 25 m.p.h. Inventions, July, 1936 Used to haul oil to the Persian Gulf from fields 400 miles away, this 8-wheeled, 3,700-gallon tanker crosses a mountain pass 8,000 feet high. All 8 wheels can be braked at once. Huge Sprays Used To Color Pottery TILIZING new designs and colors, a California pottery expert, Mrs. R. A. Hickman, has worked out a new method for producing colored pottery. The actual model- ing is done with a special clay secured from California hills. Following the modeling, the pottery is designed. Then the potter adds the finishing touches by donning a gas mask to wield a huge nozzle for spraying with pigmented fluids. Baking at high tempera- tures brings out the color of the sprays. A California woman has invented a new method of coloring pottery. Donning a gas mask, she sprays it from a huge nozzle, Baking in high temperatures brings out color of sprays. 77

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Bicycle Without Pedals or Gears Catching Popular Fancy This Ingo-Bike has neither pedals nor gears. utilizes springboard action to attain a speed as fast as 20 Instead, it miles an hour. Two brothers spent 2 years perfecting it. German Mail Bus Placed in Service FLEET of six-wheeled master buses has been placed in service by the German Postal Department. The buses are powered by 150 h. p. Diesel engines and are intended to expedite mail deliveries from the main postal centers to the provinces. Equipped for sorting and handling mail en route, they also boast windows which afford perfect illumination during daylight hours. A fleet of these buses has been placed in service by the German Reichpost. They are especially designed for handling mail en route. Powered by 150 h.p. Diesel engines, they run from the main postal centers to the provinces. 78 BICYCLE without pedals, the “Ingo- Bike,” harnesses the free power in the end of a flexible scooter board. A Negro boy with a home-made scooter gave the Huyssen brothers the idea for their Ingo-Bike. The lad’s weight released from the rear of his scooter board sent the scooter bouncing for- ward. The brothers set to work to harness this free power. The result, after two years of work and more than 50 models of spring platform bicycles, was the Ingo-Bike. It attains a speed of 20 miles an hour. Machine Makes Issuing Checks Easy This electric protectograph working in tandem with the check signer on the right can turn out 2,500 checks, written, signed, and numerically stacked in an hour. They also operate singly. N ELECTRIC Protectograph, the latest development in the field of mechanical protection for money in transit, operating in tandem with a check signer, can turn out 2,500 checks, written, signed, and pee stacked in an hour. Operating as a single unit, the electric protectograph is capable of an hourly volume of 1,500 checks of different denominations or 2,500 identical checks under average manipulation by an average oper- ator. This output can be increased approximately 1,000 an hour with an experienced operator. The total capacity of the protectograph is 3,800 checks an hour. For smaller firms the hand pro- tectograph solves the problem of issuing large numbers of checks. Both the electric and hand pro- tectograph write checks up to $99,999.99. Modern Mechanix Hobbies &

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More CASH PRIZE WINNERS ANNOUNCED in $50.00 NEEDED INVENTIONS Contest THERMOSTATICALLY CONTROLED WATER TEMPERATURE FOR =. SHOWERS GAS PURIFIER ND why didn’t someone think of that before?” is the question many readers will ask themselves after learning of the latest winners in the MM Needed Inventions Contest. It is the simple idea which makes the great invention and simple ideas are what the contest judges want. Francis W. Oliver, of San Mateo, California, suggested that some ambitious inven- tor perfect a system for quickly checking the igni- tion timing of automobile engines and took first prize of $25 for the idea. Mr. Oliver believes that a system of electric or neon lamps might be connected into the igni- tion circuit to indicate the firing order of the plugs. In this way the eyes being much more sensitive than the ears would detect the slightest error as indicated by the lamps. Each month Modern Mechanix, Hobbies and Inventions offers cash prizes to the 10 readers submitting the best ideas for the most needed inventions of today. The ideas Inventions, July, 1936 A MACHINE WHICH WILL CHECK THE IGNITION PRIZES First Prize ............ Second Prize ........ Third Prize .......... Three Fourth Prizes Four Fifth Prizes... Total—10 Prizes... eee raat TIMING OF AUTOS Above-—An instrument that will assist in timing a car will be welcomed by all mechanics. Operated possibly by neon lamps or meters the device must be simple to gain favor. Left, above-——A tempera- ture regulating device would prove a boon to most homes; scalds would be impossible. ` Left—-A ..simple exhaust to prevent carbon monoxide gas. need not be of technical nature, In fact, a simple idea for use in the garage, workshop or home stands a better chance than a com- plicated device suitable for use in a limited field. For example: The second prize winner, A. H. Johnson, of Washing- ton, D. C., submitted the $25.00 in Cash idea of an adjustable tem- .. 10.00 in Cash perature control for shower 5.00 in Cash baths. Mr. Johnson believes 2.00 each that if some device where 1.00 each installed in the plumbing 50.00 in Cash systems in apartment houses and hotels painful scalds caused by overheated water might be avoided, A simple control mounted on the wall would eliminate all possible danger. Allen W. Torbert, Baltimore, Maryland, recommends an attachment for automobiles that will render carbon monoxide gas harm- less. “Such an invention,” says Mr. Torbert, “would save many lives and at the same time make cities with heavy traffic more healthful.” [Continued on page 124] 79

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Building Usefulness Into HE basement, long the repository for cob- webs, lumber scraps, and discarded junk, is rapidly undergoing a transformation which will make this long neglected room one of the most popular in the house. In a recent contest sponsored by the Ameri- can Radiator Company among members of the New York School of Fine and Applied Art, 36 notable examples of what can be done with a cluttered up basement were presented. Working from floor plans and photos of actual cellars, the students built models of sports rooms, hobby rooms, play rooms, studios and all-around utility rooms. COST OF Sy ee CELLAR INTO PLAYROO STRUCTURAL AETERATIONS: Erection of par CARINE T WORK TIN 18 Walls. ceiling, floor and fugnitore; including paper Cr $157.00 Special Furnishings, $83.00 The contestants tackled the problem by disguising obstructive beams and pipes with an all-over color scheme of unified colors. Basement pillars were used as the center for circular benches, tables or cabinets, while the floors were painted or covered with linoleum. The rough plaster walls were painted in pleasing colors, and in many ‘cases were con- cealed behind shelves, book cases, or covered entirely with paneling. The model basements, placed on display in Rockefeller Center, New York, immediately focussed nationwide attention on the Ugly Duckling of the home. Architects hurriedly Today’s kiddies are fortunate in having dads who plan their 80 play hours in such beautiful safe quarters as the con- verted basement shown above. Circle— an old Just dust and furniture collector was this unused But at the low cost of $132 (minus appliances), the cellar was transformed as shown in photo above. cellar. Modern Mechanix Hobbies &

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Your Neglected Basement This basement belongs to an athlete, with the construction cost (without gymnasium equipment), 190 well-spent dol- lars. The draftsman (right) spent $235 for his home hobby. began making estimates on the costs of con- verting disreputable basements into charming rooms. They found that even in the most horrible examples the restoration would not exceed $400, while with the exercise of a little ingenuity, miracles could be wrought for as little as $50. Naturally the camouflaging of the furnace is a big item. If it is a coal burner this is usually accomplished by boxing it in a room by itself. Modern oil burners and air condi- tioners with their bright finishes and new designs, need no such concealment. If you are handy with tools, any number of treatments will suggest themselves. By using composition materials, you can write your own price for transforming the neglected basement into the home’s most popular room. Circle—-Not only is this basement useless and unsightly, but it is a fire-trap as well. At left is shown the same basement after re- modelling. The reno- vation, exclusive of furnace, cost less than $200. This room now equals any found in most expensive homes. Inventions, July, 1936 81

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Minnesota Bridge Has Ramp That Goes Round And Round This Minnesota bridge, built high over the Mississippi to give : tiver steamers enough head-room, has an approach ramp that spirals groundward to permit automobile vehicular traffic. Fire Ladder Rises Skyward 164 Feet HE loftiest fire ladder in South America, 164 feet high, has just been placed in service by the fire department of Buenos Aires, Argentina. With its assistance rescues can be effected from the roof of 15-story building. Roof fires can be immediately quenched. Special jacks are mounted to the base to preserve stability and prevent the ladder from toppling. An inclination dial shows when the safety limit of extension has been reached. Should the warning go unno- ticed, however, automatic machinery at once prevents further extension of the ladder. This automatic device can be locked by the delib- erate use of a patent trip catch. Manufactured in England, the ladder folds up into four sections which can be easily mounted on the fire truck. At the top, the ladder is equipped with a jet through which water can be directed to any part of the burn- ‘ing building inaccessible from the ground. ARS meer a por ma ageno x K j PEGAL This fire ladder used by the Buenos Aires Fire Department reaches 164 feet into the air. m i An inclination dial shows when the ladder has been extended to the limit. the base to prevent it from toppling. 82 ASTINGS, MINN., solved the problem of building a bridge high enough over the Mississippi to permit head-room for river steamers, but the solution posed a still more difficult problem, the building of a ramp which would not be too steep, but which would still enter the town without overshooting the main street. The result is the famous spiral ramp. Be- ginning at the bridgehead this ramp spirals groundward in gentle gradients until it leads into one of Hastings’ main thoroughfares. . New Process Turns Out Clean Dirt LEAN dirt required by florists and spe- cialty growers can be obtained elec- trically by a sterilization process similar to that employed in the pasteurization of milk. The process kills such plant enemies as weed seeds, insect life, and fungi, leaving the ground pure for the flower seeds. Special jacks are mounted to 3 At the top, the ladder has been equipped with a jet through which water can be directed to points inaccessible from the ground. Modern Mechanix Hobbies &

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Housewives Welcome New Conveniences FOOD BOWL LINERS for children make breakfast seem to taste better, as there is a picture and story which cannot be seen until all food has been eaten. LIQUID SHOE POL- ISHING container for the home cannot spill even when tipped over. A spring valve seals the bottle. The polish is obtained by pressing the dauber against spring. rre |i , mincer, grater LER and cutter can be used in | | NEW DISHWASH- preparing any type of salad ; | ING MACHINE is with Be need of changing A puik into a ee utensils. One utility tool oe sina rrows indicate e |f does wok of several T diles: : mechanism which in- P BAS SHELTER ; jects cleansing chem- sane ‘ “i K acts ike a icals into the water. Heise i clothes wringer E : quickly strips pods. The peas ¿`| are inserted be- 1 | tween rollers and Pressure snaps. the pod open. i j j i} 7 ARM CHAIR DRAWERS THIS INVISIBLE KITCHEN, when folded, -occupies no pa cea Mi ate the latest convenience more room than a standard cabinet. All equipment necessary $ : j N introduced by furniture men, for cooking, including stove, sink and ice box, are inside. ; : Smokers and readers find 5 ees ja eet them especially desirable. Inventions, July, 1936 f 83

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MUSICAL FREAKS Win Fame Just try to arrange all the instru- ments above so that they. will be instantly available to your lips. hands, knees and feet. Vincent Muni did it—made the “music go round and round” the nation to bring him instant fame, But it took mechanical ingenuity, plus the ability to play, to merge the whole into a weekly salary. re marvelous how a home workshop fan can make himself famous with a broom, a saw, a dozen tin cans or a few dingy bottles picked up from a junk pile. Take these assorted ingredients, mix in a little inventive genius, and you have the makings of a typical success story as drama- tized every week before the nation-wide audience of Major Edward Bowes’ famous radio Amateur Hour. On the Amateur Hour, saws sound like violins, milk bottles like xylophones, and glass tumblers like cellos. Almost any day some workshop musician may emerge with a band saw that sounds like an orchestra, or a drill press as versatile as a pipe organ. Victor Lundgren is an example of a young man who made good on the Amateur Hour as the inventor of a musical instrument which any home craftsman can duplicate in a few minutes. An ordinary house broom is the backbone of his instrument. He stretched a single wire along the handle, elevating it with a bridge like that used on a violin, For 84 All right, all right! Wire, glass, tin cans-— anything. It was all the same to these boys, who made jobs grow from their mechanical ingenuity. This article re- lates what you didn’t hear on the radio. Rehearsal found the Major tinkling Jack Sevant’s window glass xylophone, with the tincanaphone running second. a sound chamber he took an old wooden box about six inches square. This slides up and down along the broom handle and amplifies the musical notes pro- duced by playing on the single wire with a violin bow. Steeple Jack Kay’s musical invention is even simpler. He plays an ordinary har- monica, the simple music-producer made famous on radio and in the movies by Borrah Minevitch and in his Harmonica Rascals, but he does it with the mouth organ held out of sight behind his head. He does it by remote control through the medium of a two-foot length of rubber tubing. One end of the tube ~ is held in his mouth; the other end delivers Modern Mechanix Hobbies &

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for MAJOR BOWES’ Amateurs lung power to the proper openings in the harmonica. Somewhat more complicated are the in- ventions of Jack Sevant, who is practically a symphony orchestra all by himself, with no less than four novelty instruments to his credit. He was employed as a sweeper in a factory until he made such a hit on the Ama- teur Hour that he was signed as a member of a Major Bowes traveling unit which tours the theatres of the country. His musical bottles look like a drug store window display, except that they hang by their necks from a crossbar. They are ar- ranged in graduated tones, like the keys of a piano. The bottles are tuned by filling them with varying amounts of water, and are tightly corked to prevent evaporation. When tapped with small hammers, bell-like tones are produced. A cotton string is tied behind the row of bottles, touching them and dampening the after-vibrations like the soft pedal of a piano. Similar in principle is Mr. Sevant’s “tin- canophone,” in which cans are used instead of bottles. He even leaves the labels on, and thus A sharp may be tomato soup and High C sliced pineapple. The labels cannot be taken too seriously, however, for the food contents are removed from the cans and they are tuned in much the same way as the bottles. Window glass takes the place of customary metal [Continued on page 124] Marshall Rogers’ delicate fingers stroke the goblet rims, and the crooning glasses sing to millions. Inventions, July, 1936 A bow, a broom, a wire and a box for a sound chamber brought Vic- tor Lundgren fame for his ingenuity. If the flagpoles Steeple Jack Kay painted were laid end to end, they wouldn’t reach half so far as did his remote control type of har- monica playing when the Major put him on the air to win plaudits for his utterly unique style in piped music. He doesn’t paint flagpoles now 85

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Crack Freight Comes In With the Morning’s Milk Supply This iron horse hauls a fast freight to give west coast towns the benefit of early morning deliveries. Christened the “Overnight,” the name describes its speedy running time. Mystery Plane Aims At New Record NEW mystery plane with a cruising speed of 200 miles an hour is being groomed by the French for a trans-Atlantic hop from Paris to New York and return in 40 hours. Built by the Cauldron works, the plane is now undergoing extensive tests under the watchful eye of the famous pilot, Captain Rossi. Rossi hopes to make the crossing in 16 hours and after a rest of 8 hours to return to France in 16 hours. The mystery plane, 1936 edition, is a far cry from the monoplane flown across the English Channel by Rossi’s compatriot, Bleriot, in 1917. Here is the secretly built French plane which hopes to span the Atlantic in 40 hours and return. Powered with Renault motors, the ship has a cruising speed of 200 miles an hour. 86 RUCKS and modern science have com- bined with the freight train to provide merchants between San Francisco and Los Angeles with overnight delivery service over the 450-mile route. The fast freight, christened the Overnight, makes but four stops between the two cities. Fleets of trucks, working in close cooperation with the train, scour the intermediary points, picking up freight and making deliveries. So tight is the schedule that multiplex printers, operating at 60 words per minute, are needed to telegraph the way bills ahead. Not only do milk distributors in California’s key cities get their produce before daybreak, but a full day is clipped from the Los Angeles- Reno schedule. It is expected that other freight routes soon will be speeded up. Lathe Combines Beauty With Utility OINTING the way toa new trend in ma- chine design, a. new _ precision- built lathe com- bines beauty of line, rigid con- struction and freedom from vibration. It can be run at any speed desired. In addition, the lathe is adapt- able for bench This precision-built lathe combines freedom from vibration with beauty of line, safety, and rigid construction. Note shelf-space. or pedestal mounting. New Rod and Grip Aid Fisherman ODAY’S ACTIONIZED Anglers are ee e AIR CHAMBER slated for a new deal, judging by the latest inno- vations, an` “ac- tionized” steel rod and a new type streamline vacuum grip. The vacuum grip is obtained by. a tapered cowling housing an air- chamber which grips the rod. Izaak Walton would welcome this new steel fishing rod with a special grip which keeps it in position. Modern Mechanix Hobbies &

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Architect Builds Modern GLASS HOME HE open spaciousness of a country manor, captured in a 5-story house but 19 feet wide and set in the heart of crowded New York City is the latest architectural miracle to be wrought by the use of glass blocks. From the outside the narrow structure, de- signed and built by Morris B. Sanders, archi- tect, is impressively beautiful. Inside all idea of confinement is lost. Through a clever method of arranging the furniture close to the wall an illusion of space is created which is further heightened by the perspective- destroying glass walls. The rooms seem to extend indefinitely. l Recessed shelves, bookcases, and cupboards add to the roominess of the interior. In many cases metal furniture was used. Inventions, July, 1936 Above— Though less than 19 feet in width, this modern living room in New York’s latest glass-fronted home looks as large and open as all outdoors. Circle— Morris B, San- ders, the archi- tet who de- signed and built the house for himself, planned this airy room for a drafting office. The glass Top, right—-A night view of the glass house. € a blocks permit light to shine throngh, but screen the interior from persons on the street. Above-—-A neat lounging room on an upper floor. Rooms are all sound proof, dust proof and air conditioned. Metal furniture adds to spaciousness. 87

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Small Porcelain This porcelain base supports an iron radio tower reaching 390 feet into the air. The base is 6 inches in diameter and only 18 inches long. Total pressure on porcelain base is 120 tons. Automatic Glass Washer Patented N AUTOMATIC glass washer has been patented by two Wisconsin inventors. The apparatus instantly washes glassware inside and out. This automatic glass washer com- prises an upright nozzle over which a vessel is placed. Downward pressure opens a valve and releases outer and inner water sprays. 88 Base Supports 390-Foot Radio Tower ia PORCELAIN base 6 inches in diameter and 18 inches high supports a single radio tower 6 feet square and 390 feet high at the north end of St. Louis, Mo. The tower, one of several in the United States, has been erected for Station KWK in St. Louis near the Mississippi river at a site offering the most efficient ground effect. Made of channel iron, the lofty tower has a dead weight of 20 tons and with its four guy wires exerts a total pressure on its porcelain base of 120 tons. It is calculated that the base can bear an added strain of 80 tons. Severe pull on the guy wires requires that they be fastened to a cement standard sunk 10 feet into the ground. The wires are con- nected with the tower at a point 211 feet from the ground. The Arthur A. Zeis Erecting Co., of St. Louis, constructed the tower. Robot Listeners Check Broadcasts GROUP of six “listeners” to Station WOR haven’t missed a single broadcast note or syllable in six months. The “listeners” con- sists of six decibel meters which follow each rise and fall of signal volume at high speed. They are part of a study of the advantages of this “high speed” type of decibel meter in checking broad- cast signal char- acteristics. Op- erated by a fixed frequency re- ceiver turned on last June, and kept in constant operation since, meters spring into action with WOR’s signal. These radio “listeners” have checked every note broadcast by Station WOR in the last 6 months. Dash Lamp Warns of Light Failure LIGHT failure indicator which promptly informs the driver when one or. more . lights on his car are failing is now being manufactured by a California con- cern. By means of an inexpen- F sive relay system the failing light turns on a small warning bulb on the dash panel. The arrow is, on when a headlight burns out. Modern Mechanix Hobbies & small lamp indicated by automatically turned

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Making the World's Largest PHOTOGRAPHS by EARL THEISEN SECRET GRAIN ARC LAMP ELIMINATOR This special enlarging camera, equipped with a secret device to diffuse the grains of silver in an image, enlarges a nega- tive the size of a postage stamp to make a 16’x20’ photo. —— ENLARGING CAMERA | CAN BE RAISED 9 FT. PHOTO - BACKGROUND | MOVIE SET RAISED 3 FT. Here is the stage setting for the above photo, taken during the filming of ‘Broadway Melody of 1936.” is used in preference to a real one because technicians can better control sound, | Towering New York skyscrapers in the background of this movie set are really photo enlargements. 3 M COUNTER- BALANCED CAMERA CRANE This inside set ight, and camera angles. To take above photo, for instance, the cameraman would have to be perched dangerously over an alloy, a strain on himself and actors. ISUALIZE a photograph about as long as the average city block, and as tall as a telephone pole, and you will have some idea of the enlargements being used in moving pictures. The largest photograph ever made by Pacific Studios, who specialize in this type of work, was 180 feet in length and 30 feet high, and showed the skyline of New York. The views through windows of tall build- ings, foreign scenes, or mountain and forest panoramas are in most instances photo en- largements made to serve as atmospheric Inventions, July, 1936 backgrounds. They are mounted on wheels and rolled into any desired position. The great pictures are made on a specially woven canvas, coated with a light-sensitive bromide emulsion, and anchored to an easel to receive the photographic impression. The pictures are developed by the roller method. Often story requirements demand that there be trees where there are no trees, or a new skyscraper on the skyline. Then the new is grafted onto the old, and the manipulations cannot be detected on the screen. 89

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LIGHT ALUM, TUBE SWAGED TO RADIO PANEL SNAP SWITCH CONTROLS IGNITION 3/8" 3-PLY FIR TRANSOM \ iA A A DECK LINE AT COCKPIT DECK LINE AT SHEER \ y/, ` 4 CHINE LOG 1/4" X 1/4" SHAFT LOG OF WALNUT GLUE WITH CASEIN AND FASTEN TO BOTTOM WITH SCREWS DRIVEN. FROM BENEATH “SUNBEAM”—a by WESTON FARMER MARINIZED "CHINOOK" ENGINE POSITION OF AUXILIARY CARBURETORS -~ IF USED WALNUT STEM PIECE. STRAP TO FRAME AND STEM MOULDING 4 FLASHLIGHT |. BATTERIES 6VLT |] HOSE TO WATER INTAKE OF ENGINE BRASS SHAFT SLEEVE | REAMED To 3/16" IN-DIA. i i REEFING CHINE PIECE OUTSIDE CHINE - 3/16" X 3/16" BIRCH; = E x R | 1/8" COPPE! |! SOLDERED COPPER GAS TANK | ae BOTTOM = 1/8" ePi BASSWOCD | 5 ~ 1/8" 3-PLY BASSWOOD | SIDE PLANKING fa" xia" BIRCH- ~" COCKPIT STRINGER ae DECK WITH 1/8" 3-PLY BASSWOOD “SUNBEAM *”-Fıic.2 SCALE OIL HOLE STRAP NOTE- ALL FRAMES 3/8" PLYWOOO EXCEPT AT STEP FRAME WHICH IS OF 1/2" PLYWOOD.. USE /2"# 3 FLAT HD BRASS OR COPPER SCREWS THRUOUT IN INCHES o 1 2 3 4 5 6 In building “Sunbeam” follow the plans carefully paying close attention to the various dimensions. The above cross section diagram clearly shows the arrangement of the hull as well as the location of miniature engine and ignition system. OTHING affords more pleasure than to see a model hydroplane, built by your own hands go skimming through the water in a most realistic manner. Powered by “Chi- nook,” the miniature gasoline engine de- scribed in the May issue of MODERN MECHANIX & Inventions, “Sunbeam,” as the model race- boat has been named, is the last word in model marine craft, The construction of the hull is not at all difficult as one will learn after examining the detailed plans. Birch and 3-ply basswood are used to form stringers, frames and inci- dental parts. To begin actual construction first repro- duce the lines drawing full size on a drawing board, then draw out the patterns for the frames, deducting 4” all around for the %” plywood basswood planking which is used. A keel pattern board must be cut out to space the frames and to keep them aligned while you are screwing on the side planks. Line the keel pattern board up on the drawing board as shown in the sketch, Fig. 1, and the 90 STUFFING BOX REEFING CHINE PISCE S ENGINE STRINGER - SEE DETAIL BELOW 3/1" x 5/8" BIRCH == HEIGHT AND ANGLE AT "BUB" TO SUIT ENGINE AND ENSURE ALIGNMENT OF DRIVE, SHAFT SLOPE TO COINCIDE WITH BOTTOM AFT OF STEP. La Pouca FOR FRAME #2 of j FIG.2-A-MAKE 2 ENGINE STRINGERS OF BIRCH TO SUIT ENGINE USED _ NOTCH FOR FRAME #4 frames are then put in as progressively shown. The transom is solid, of course, and is beveled for the proper rake before being temporarily fastened by brads to the keel pattern board. Attach the walnut nose piece to the keel pattern beard, which can be of 34” scrub stock, and then put in the sheer clamps and the chine logs. The construction of the frame at the step has been made clear in the draw- ings. Use 3” No. 3 flathead brass screws for the planking, or 14” size if screwing into end grain in the plywood frames. The sides are attached to the chine log and sheer clamp with screws spaced about 11⁄4” on centers. Thick casein glue is also used in attaching the sides to the clamp and chine. Being waterproof it will prevent leaks. Next the bottom aft is put on. This is a simple operation, but it might be wise to state that all the holes for the screws must first be Modern Mechanix Hobbies &

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Powered with the MM “Chi- nook” this model hydroplane as 2 oe 4 F. completed and ready = LO offers model fans new thrills. i for hetarat trial run: The tubular device in center is the spark coil. drilled with a root diameter drill ae ee \ to a depth of 14” in order to pre- = ; Py vent splitting. Countersink the : i ED screw heads flush with a rosette. z : The crown is cut into the aft formers. Forward, separate crown formers must be made and as these will take some fitting and beveling to get them right, they should be made as separate pieces, later to be glued. Si A former is used to determine the proper crown for the hydroplane. Painting of the hull should be done with priming coats of half boiled oil and turpen- The table shown below gives the offsets for the measurements not indi- cated on the lines plan and profile. Deduct from above tine. When dry, sand, and apply synthetic dimensions for planking. auto enamel in colors desired. The original “Sunbeam,” as shown in photos, was painted TABLE OF OFFSETS FOR DIMENSIONS NOT SHOWN a buff creari. ON LINES PLAN = OFFSETS TO OUTSIDE OF PLANKING While construction of hull is quite simple FRAME NO. —> TRANSOM some explanation as to “Sunbeam’s” opera- AFT CHINE tion is in order. First, you will notice that the OUTSIDE CHINE | boat has no rudder. Since it is operated from -| REEFING CHINE a central stake or tethering boat moored in SHEER LINE _ | AFT DECK CROWN | DECK CROWN AT [78 NO.4 IS HIE"; DECK LINE E3 BASELINE | MAKE KEEL PATTERN TO slices | Baek PROFILE - HEIGHTS ABOVE BASELINE | SHEERJ& CHINE LINES COINCIDE | STEM | OUTSIDE CHINE MOULDII = SHAPE OF : FRAME! AT STEP IS FWD. OF PROJECTED 4 STATION LINE- ALL OTHER 4" TRANSOM FRAMES GO AFT OF THE LINE | HALF-BREADT H | o ae doe ke WIE As 290 OR 4g 26.25" ———___________________ Fig.| DIMENSIONED PLAN —HALF-BREADTHS FROM CENTER! "SUNBEAM"=20 MILE LINES PLAN & PROFILE PLANT HALF-BREADTHS FROM CENTERLINE 2 MODEL HYDROPLANE The lines drawing should be reproduced full size on drawing paper according to the above measurements before starting any actual construction. Note that the placement of frame at step is forward of the station line while all other frames are aft. Inventions, July, 1936 91

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Lay Out Plans To Full Size Before Building | CUT KEEL PATTERN BOARD TO FULL SIZE PROFILE LINES AFTER DEOUCTING FOR NOSE PIECES, TRANSOM AND 1/8" PLANKING AND DECK- ING. THE FORMER IS REMOVED BEFORE THE NY q DECKING IS LAID BUT AFTER PLANKING. BEVEL & FIT. p TRANSOM CROWN FALLS OVER END OF BOARD AS INDICATED DRAWING BOARD _ FIG. 3- DETAIL OF KEEL PATTERN BOARD. OR JIG, SHOWING METHOD OF ASSEMBLING FRAMES ‘the middle of a lake, and a cord, such as a stout fishline, is hooked with a brass leader into the brass rail at the starboard side, a rudder is not required. The engine is started up and the craft gently lowered into the water. A good push sets it into motion after which the line is paid out for about fifty feet. A fishing reel mounted on a stub pole is ex- cellent for this purpose. When the gas runs out the boat can be reeled in. Should the cord break, or should you wish to stop the boat before the run is finished, an ignition switch on the side of the decking allows a cord or a pole to be used in swiping off the ignition in emergencies. The switch is a radio toggle type with a tubular ex- tension. Cooling, water for the engine is obtained preferably through the strut. The strut can be drilled as shown, and a tube led 92 SHEL þe gn eer ume I ra A CROWN TO A: E SUIT NOSE BLOCK TYPICAL FRAME. VARIES WITH FRAME NO. NOTCH FOR CLAMP aL" eae: 7 FIT NOSE BLOCK 7 AND ALL FRAMES PROGRESSIVELY NOTCH FOR CHINE FRAME Above is shown the detailed diagram for the keel pattern board. Cut this according to the dimensions of the keel profile pieces deducting for nose pieces, transom and 1⁄4” planking and decking. Bottom of finished hull is shown. through the transom, from which a rubber hose is used to carry water to the jacket in- take of the engine. From the jacket it is piped overboard, Although a scoop can be used the strut idea has the advantage of the engine being cooled even though the boat is not in motion. Without the strut scoop the motor will heat when running at a dock. Ignition for the motor is supplied by an aero model spark coil. Current for the coil is obtained from four flashlight cells wired in series and soldered at the contacts to give six volts. If the popular Duplex carburetion is used, several changes are required. One is the matter of forcing fuel to the carburetors, which in this case are higher than the fuel. To do this a rubber tube is run from the goose neck vent in the gas tank, to a small balloon which has previously been blown up by lung power to give one to two pounds above atmospheric pressure. This will keep gas at the needle valve. In the orginal carbureting system, as shown with the aero engine, no balloon is necessary. The method of laying out the screw pro- peller is shown in the drawing. Be sure your wheel is a “true screw” wheel, with all parts of the blade advancing at the same pitch, so that in one turn all points would travel the Modern Mechanix Hobbies &

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Jig Saw Aids In Making Smaller Parts For “SUNBEAM” POINTS =~ SHAFT CAM z 4 SET SCREW FIG.6A~ SUGGESTED á TIMER- FOR MOUNTING ON THE STUFFING BOX FIG.6. ~ WIRING DIAGRAM.caM ON TIMER HOLDS POINTS APART UN- TIL SPARK 1S WANTED; THEN POINTS CLOSE AND OPEN ~ ONE SINGLE HOT SPARK OCCURS AT PLUG AS POINTS OPEN, CONDENSER ACROSS SPARK daa POINTS PREVENTS EXCESS SPARKING, S~% _ CROWN FORMER SEPARATE PIECE MOULDING REEFING CHINE This is the appearance of the hull after the framing has been completed. Crown pieces are glued in place over the frames to form a rigid support for attaching deck. For best results use a jig or coping saw for cutting frame and crown pieces. same distance no matter what their radii from _ the hub. By using the method of layout in the drawing you assure this. The wheel can be cast as shown in the diagrams, using old piston alloy stock out from junk autos for metal, or you may build up props silver soldering hammered blades to a brass hub as the drawing shows. Should you wish a variable spark control it can be arranged by making a timer as shown in cross section on the inboard profile and in the detail drawings. This will make the engine a bit easier to start and offer the advantage of a controllable speed. In the Chinook aero the timing is fixed. In case the stuffing box timer is used the wiring is of course led to it according to the wiring dia- gram after which the ordinary timer be- comes inoperative. The engine is started by winding a cord around the flywheel in strop. fashion. For fuel, lubricating oil is mixed with the gasoline to the ratio of about 1 pint to each quart. Use heavy oil, and high test gas for best results. BLUEPRINTS FOR “SUNBEAM” SPEEDBOAT Enlarged blueprint plans for building Sunbeam” will greatly simplify construction. These plans are Order Blueprint No. Greenwich," available at $1.00 postpaid. M-412, Modern Mechanix Publ. Co., Conn. Inventions, July, 1936 RETARD — my Meta BRASS PLATE HARD OIL iS | O TA 3/6" 1.0, Ee es À ( TUBE HAND THUS RES B ROSETTE A ‘ A S , a: Z f SHAFT CROWN PATTERN — SEE PROJECT INTERSECTING LINES EXPLANATION IN TEXT = ALONG BASE LINE A-B F.H.BRASS SCREWS - COUNTERSINK THE HEADS FLUSH BY i» -] a id Wa" 3-PLY p J bassweop A SEE DETAIL OF © BOTTOM AT STEP é LEFT HAND WHEEL RIGHT HAND. WHEEL = 13/4"D.X 2 1/2" P. E ROTATION LOOKING FWD. — HOW TO LAY OUT "TRUE SCREW" PROPELLERS l. —* LAY OUT LINE O-D. EQUAL TO CIRCUMFERENCE 2. LAY OUT LINE O- Y:PITCH 3. DIVIDE O-D INTO FOUR EQUAL PARTS A,B.C-D THE RESULTING ANGLES ARE TRUE SCREWAT FACE OF BLADE***SHAPE PATTERN WITH 1/8" THICK BLADES; FILE CASTING AND FINI H BLADES TO I/16" THICKNESS DETERMINES PITCH o A j þe 77 x D= 314x 1.75" = (CIRCUMFERENCE) FIG. 8 ` BUILT UP PROPELLER CUT BLADE HOLLOW IN HARDWOOD BLOCK HAMMERED BLADE 2 Propeller is made as shown above by soldering hammered brass blades to the propeller hub. If desired the propeller may be cast from white metal although a great deal of care is needed to do this. SAW œ CUT gg SILVER SOLDER BLADE TO HUB 93

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SHORT CUTS FOR THE SHOP MAN CELLULOID Instrument Finds Center of Circles -ree Aru cones. PH TOE ASE EPCE ONES CELLULOID disc divided into three like pra ete as sections and marked off in inches as shown makes a handy rule for finding the exact center of a round object. To use the rule it is only necessary to place the disc over the end of the article to be measured and move it about until all edges show the same reading. A small hole pierced in the center of the rule permits the object to be marked with a scriber or stylus-—Dr. A. Bustamente. Nail Driven In Screw-Head Prevents Removal NAIL driven into an ordinary screw effectively thwarts any attempt to remove it from exposed hasps and hinges. A cut is made at an angle in the screw-head with a thick or double hacksaw blade. The door hinges are then mounted using the special screws. After having been securely inserted small finishing nails are driven into the enlarged slots at an angle so as to hold the screws rigid. A small countersink or punch will aid in driving the nails below the level of the screw heads.—T. L. Moore. Sawdust Helps To Clean Oily Machine Belts EATHER belts which have accumulated oil and grease after long usage may be restored to their original condition by scrubbing with very fine sawdust. Remove the belt from the machine and lay it flat on the floor. Scrub the sawdust over the belt using a stiff bristle brush. Rub the sawdust well into the grain of the belt so as to absorb all of the grease on the surface. When this work has been completed scrape off the sawdust with a putty knife or similar dull tool. For the final operation, coat the belt with fuller’s earth and set aside to dry in a warm place. The fuller’s earth removes the remaining grease particles from the pores of the leather. Treating a belt in this manner is not at all difficult and the money the operation saves is well worth the trouble-—L. Robinson. Washers Prevent Nails Marring Wood HEN repairing furniture about the home a slip of the hammer may result in an ugly dent in Ss N the wood. Usually the correction is either impos- E i sible or it involves a great amount of time. A simple LAS and sure way to avoid damaging furniture during e eh ee repair work is to slip a leather washer over the nail FROM POSSIBLE INJURY just as soon as it has been started in the wood. The rs ll nail can then be driven without the danger of the hammer doing harm.—L. B. Robbins. LEATHER WASHER 94 Modern Mechanix Hobbies &

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pot AR CONDITIO} you can make by DALE R. VAN HORN J / Oe RB s g : 4. CONN a 5. FAN © COLD A -HOTARE ORT P ITH theaters, trains, ships and stores provided with air conditioning equip- ment there is no reason why the home owner should go without this modern convenience. A practical air conditioner can be built by - anyone familiar with tools at very little ex- pense. Through its ingenious design the pipes of warm air heating systems may be used to carry the cool air to all parts of the house. This air conditioner has been designed primarily to best suit the needs of the home shop fan. For the most part, simple con- struction predominates. As may be seen, many of the dimensions are arbitrary for the average home is blessed with any one of a number of heating plant types. This condi- tioner will fit nicely into any home having hot air heat for the adjustments needed to fit the unit into place are few. Inventions, July, 1936 R BO. s NECTING PIP, Beau ERSTER “APPROX. 7- The diagram at left shows the manner in which the air conditioner is connected to the basement furnace. The cooling system couples with the cold air inlet on the furnace which in turn carries the cool air to all parts of the home. This refrigeration plant is not only inexpensive to build, but it has the added feature of consum- ing very little water and electricity during con- tinual summer operation. An air conditioner, to be efficient, adds moisture to the dry air of winter months, and removes excess moisture from over humid air during certain summer conditions. It is an all-the-year-round unit of benefit, helping to make homes more comfortable in winter and more tolerable on excessively hot sum- mer days. A glance at the drawings will show that this unit has four major parts. There is the fan compartment, the filter box, the moisture _box and the condensing plates. In winter the conditioner is hooked up between the furnace and the cold air pipes. In summer, the unit may be left as for winter or the down pipe over the fan box may be removed, thus per- mitting the cool air of the basement, rather than the cooler air from upstairs, to be used. If water from city mains is used ordinarily 95

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Air Conditioner Sends Cool Breezes Through Heater Pipes LIGHT as IRON OED a wi with the unit on some summer days, it may > B — SIRAP IRON rise above 55 or 60 degrees, then for the best _ eS Pee cooling effects the water can be shut off, the we GE! gg” ao basement floor wetted down and the air blown -op goarp’to through the unit without benefit of the water SYT see secviov. | box or condensing plates. Experiment will 0% asseweu determine the best adjustments for all con- ditions. Wood construction for the most part is m i COUNTERSINK _. specified. Use cypress for all construction ALL screws ~ between the fan and the furnace. If you have the facilities however, and prefer, you eee NOTCH TO FLUSH FIT FILTER FRAME -=> | STRAP IRON | 3 SCREEN f ~~ 36" | ney ~~; GASKET Ree SECTION THRU FILTER Á 1" X 2" CLEATS FORM GROOVES PIN SPRAY i 5 = sg NOZZLE IS a CENTERED TA d| 6 RDA |- ON SPATTER P | p Sd PLATE DISC P SPATTER PIPE SETS FLUSH PL i „TO FLOOR LEVEL ; O SAIR FILTERING COMPARTMENT Me RECESS a OO l GENERAL LAYOUTOF Ho my E ECOOR FOR j X | e l AIR WASHER TANK PIPE NUT x Z = s : DRAIN VALVE—> y $ e : N of The air conditioner’s washing tank should NEF N INLET PIPE |10 be constructed from cypress wood to insure against rot. Make the filter cloth according to the above diagram. Use screws throughout in constructing the tank. BAFFLE PLATE- MAKE 20 - LE PLATE can substitute galvanized iron for practically BATE BLY all of the sections. Tongue and groove the boards for the top, sides, ends and bottom of the water compart- ment. They are 3 feet square and 26 to 28 inches high. The baffle or condenser plates. are bent in “V” shape and installed, as shown. Directly in front of the baffle a hole is cut for the outlet compartment. The wet air draft passes between the off-set plates which con- dense the surplus moisture, and is then de- flected upward by the galvanized iron vent which is nailed to the inside walls of the outlet compartment. A lip of galvanized iron is bent over as shown so that an occasional drop of water will be caught and thrown back In order that the moisture into the water box. After passing through metal lip as r N ie tailed. deals behini Basie: 96 Modern Mechanix Hobbies &

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Pictorial Diagrams Aid In Simplyfying Construction the vent the air enters the 16-inch pipe and on into the furnace jacket. In the center of the baffle mount a strip for supporting a copper disc to form the spatter plate. The disc should be in direct line with the pin stream of water which issues from the spray nozzle. The tiny stream of water strikes the spatter plate and is broken into minute parts which cool and wet the air. The piping comprises an inlet pipe near the right end of the water box of sufficient height that when the nozzle has been screwed on the pin stream is centered with the spatter plate. The lower end of the pipe is provided with 2 inches of thread, permitting thin nuts and washers to be screwed on each side of the cypress floor. The other pipe which is simply an overflow or drain also has rather long threads permitting the top nut to be screwed on in a recess cut for it, thus bringing the pipe top level with the floor. This makes it pos- sible to drain off all the water when not in use. A valve provided in the drain pipe is adjusted so as to keep a few inches of water The cold air down pipe fits on the top of the electric fan box, supply- ing cold air from joist line. Water spray not used on very hot days. Z 22" SHORT PIECE OF YÉ 16" DIAM. GALV. PIPE aS FILTER BOX END PIECE OF CYPRESS WOOD SCREW --fiie in the bottom of the washer tank at all times. This filter frame slides up and down in a groove at each end of its compartment, the grooves being formed by cleats nailed inside the ends and spaced just far enough to permit moving the frame easily up and down for withdrawal. The right end of this compart- ment is covered with a cypress board which has a hole cut in it to take the end of the short 16-inch diameter galvanized pipe leading from the fan box. The fan box can be made of white pine if Inventions, July, 1936 desired, since no moisture of an excessive nature will be present here. A standard air fan can be mounted on the motor shaft, . although a 2-bladed aluminum propeller fan is to be desired due to the high speed of the motor. A second-hand washing machine motor will do nicely for the power plant. It is essential, of course, to have the motor mounted on blocks to center the fan accu- rately. The blade tips should clear the sides of the galvanized pipe not more than 14-inch all the way around. By providing small lag screws on the end of the motor box easy [Continued on page 122]

COLD AIR DOWN PIPE \ NOTE: FAN BOX MAY | BE OF WHITE PINE — THROUGHOUT. ALL _ JOINTS NAILED Ex CEPT WHERE NOTED ~= | \ IN THE DRAWINGS _

CUT OUT TO COLD AIR PIPE SIZE

— AIRTIGHT JOINT RUBBER GASKET 152 DIAM. AUTO FAN ay, Lp REMOVEABLE INSPECTION

SMALL 4 í; LAG SCREWS K)

BLOCKS FOR MOTOR MOUNT. AS REQUIRED TO LINE UPAND CENTER THE FAN t" X3/32" STRAP IRON HANDLE GENERAL LAYOUT OF FAN COMPARTMENT

~

Build the fan compartment according to above specifications, mounting the motor on blocks for simplified adjustment. An old automobile fan is excellent for supplying necessary draft. 97

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TURNED lamp is the ideal solution for using up scrap plywood lying about the shop. The layers of plywood are cut out in discs with a jig or band saw and glued together. At the largest part of the lamp is placed a layer of walnut or other dark wood. Another layer of dark wood is placed at the smallest point in the lamp stand. The turning is a slow process and only a small cut can be taken at a time for there is a lot of mixd end grains to work with. The turn- ing tools must be very sharp and considerable sanding must be done at the finish to get a smooth job. The smoothness of the end grains is what gives the beauty to this lamp. _ The lamp is placed in the lathe with the chuck against the top and the turning is done from the bottom up. The base is completed before the small part of the spindle is turned out. Then the bowl is turned and finally the neck. The idea is to work so as to save strain on the small part while working on the larger parts. A ¥” brass nipple is set in the top of the lamp for attaching the pull socket. The lamp is fitted with a ten-inch shade. 98 . TURNED PLY- mT A Z FT o woo LAMP, iw = S178" NIPPLE- le” THREADED ire a1 1/4" aii. HB. LAYERS ZA Fes ESATEN nae | oe eal We a HOLE FOR COR — Attractive Lamp ©Ourned Grom “Plywood ( One of the things most easily made and most useful is a table lamp, and while glass, metal and other hard to work material appeal in the purchased lamp, a decided homemade novelty is this easily made plywood lamp. A Stamp Projector for Hobbyists ‘DEAL for hobby clubs, this simple projector enlarges postage stamps to giant size on a screen for examination by large groups. The projector consists of a metal box, such as a cake can, in which has been mounted a light socket to take a 100-watt lamp. Slots cut in the rear of the can allow for the stamp slide. A small square opening is cut in the front of the can so that the image may be projected through the lens which is an ordinary 10-cent magnifying glass. Mount the glass on an adjustable strip so that the stamps may be brought into focus properly. S LEAVE REST OF CAN BRIGHT FOR REFLECTION MAGNIFYING GLASS MOUNTING To TIO VOLTS This simple postage stamp pro- jector is constructed from a tin cake container, magnifying and electric light bulb. „TIN a = Modern Mechanix Hobbies &

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SURFBOARDS FOR SUMMER SPORT NO. 6, 3/4" BRASS SCREWS COUNTER- UNK X 174" CE BATTENS 144" PLY— WOOD DECK V2" WHITE PINE BULKHEADS PADDLE SUREBOARD This paddle surfboard is built with a plywood deck and a water- proof canvas bottom. The photo at left shows the surfboard before the canvas has been attached. The ribs are of spruce\and supported by white pine bulkheads. All dimensions required for construc- tion appear in the above diagrams. BOTTOM CANVAS sÀ PUT ON FIRST REASON FOR TOW ROPE ON BOTTOM Ma J WHITE PINE 22 i72" X 3/4" X 1172" F YOU are one of those who have thrilled at a surf rider’s antics and wished for your own surfboard here is your chance to build it. The four types of surfboards described here just about cover every demand and all of them are very easily constructed at home. The largest is really a paddle board, being buoyant enough for the rider to lie flat and paddle far out into the rollers with safety. It Designed for towing behind a speedboat, the construction of consists simply of a thin plywood deck, four gis squenlae is such tha it will dou like a boas at all times, white pine bulkheads over which are installed pine Brock for Wiles. Tow tape is attached on ‘the bottom. nine spruce battens, or strakes. Casein waterproof glue is used in 3/4" SPRUCE, all joints and the battens are se- STEAMED AND cured with countersunk brass screws. Any one of these surfboards can be very easily constructed in the home workshop simply by follow- ing carefully the plans illustrated here. In order to protect the wood for deterioration apply three coats of boat paint or spar varnish to all wood surfaces. Paint the canvas work in the following order: One 3/8" X I 2" BATTENS CUT OUTS 5/16" BOLTS LAMINATED SURFBOARD p u coat of shellac, one of white lead The child’s surfboard shown at left consists of a spruce board steam bent as shown. The laminated and two of spar varnish. The colors ee Deed fies Por pacan. : ` 3 3 . 4 suriDoar: is uit up o: ollowe: out sections o are left to the builder’s discretion. pees pine and redwood bolted together as shown here. Inventions, July, 1936 99

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BUILD “H HENRY" ASSEMBLY OF HANDY HENRY TRACTOR NOW HAS 6 FORWARD AND 2 REVERSE SPEEDS- FORD AND DODGE TRANS- MISSIONS ARE USED IN CONJUNCTION FORD MOTOR i ; j p È = ae zj A S ANGLE DRAW BAR, UNIV. SUPPORT n le S cW DIFFERENTIAL __\\ IRONS ad ANA DODSED, -% \ 4 : Be = ara o LA WY) BSS , A > ; goa fak = § BACK / FRONT SN A ARE te \ 2 RADIUS act SEONG ROD vy FEN ENED TIE ROD MUST | DODGE CLEAR RADIUS TRANSMISSION WHEN TURNING DRAW BAR Sa The above pictorial layout shows the FORD "P" Pi G placement of all parts on the com- FEM ORD TRUCK DIFF. CMe G\: pleted tractor. The tractor is shown UNIVERSAL) 6" PLANKS SUPPORT FRAME l g 1 at work, in the upper left hand picture, —— FROM AXLE HOUSING We A doing the work ordinarily done by a Tyee here PART =/ HOOK IRON N team of horses. Removable rims per- (DIFFERENTIA -BOTH SIDES- AA mit the „tractor to operate on either yY FITTING) BOLT THRU SSS a pneumatic tires or flanged wheels, FORD Be FRONT DRIVE SHAFT OF TRUCK DODGE TRANSMISSION DRIVE SQUARED TO FIT FORD CAN j UNIVERSAL TRANSMISSION SUPPORT HOUSING A Uai DODGE, FRONT OF TRANSMISSION, BEARING PLATE PARTS 3&4 j- FORM I UNIT STUD BOLT GOES y THRU MEMBER xn AND INTO TRANS- MISSION DODGE TRANSMISSION DODGE STUB HOUSING 2 FER 8B Ae E DE 1 Apu, f=, El (OR. 00068 F: ; TRANSMISSION ONE UNIT, i d ; INSTALLING THE DODGE TRAN : BOLTED i DODGE UNI- ` 2 LAE DODGE TRANSMISSION TO FORD VERSAL BELL aye p WORM GEAR E HOUSING To provide sufficient flexibility the chassis is cut down as 3 DIFFEREN iy shown. Cut out the original drive shaft housing and insert a dodge transmission to provide the necessary gear ratios for pulling heavy loads. Transmission is welded to bell housings and supported by T” frame member. Welds must be secure. PA O PA ie) by E. H. GIBSON ERHAPS in your own back yard you . have an old Model T Ford truck or "REPLACE THIS ONT To FIT DODGE N é passenger car that wasn’t worth a license tag. ae WORM GEAR =m E aE] : $| If it is a truck so much the better, then all ; ENTIAL p= =f i you will need is the transmission from an COUPLING DIFFERENTIAL TO TRANSMISSION old Dodge. oe The tractor described here is capable of In order to use a double transmission the worm drive shaft on A the Ford must be squared to fit the Dodge universal joint. If handling any two horse load, at a faster speed a passenger chassis is used for tractor replace the “rear end” x ` : tepo : a than horses and on nominal gas consumption. with one taken from a “T” truck. Since all parts are num: bered on diagram they may be easily identified in assembly. It should be noted that the plans have been Part “A” in one diagram and part “A” in another are same. 100 Modern Mechanix Hobbies &

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TRACTOR for ies Dollars With T Fords available throughout the country any shop man can easily convett one into a practical tractor. DODGE FORD “T™ TRANSA TRUCK DIFE Let HOLES FOR þe—o"—>] HITCHES FORD MOTOR COUPLING OF COUPLING OF m PARTS 3 8&4 PARTS 2 AND 5 A SEMBLY. OF MAIN UNITS The photo above shows the rear of ‘Handy Henry” and location of clevis holes. The draw bar is located in the center. Note manner in which differential is mounted to the chassis. The drawings depict the manner in which this is done. worked out in an effort to build this tractor without undue cost. Where possible, all fittings are made in your own work shop and it is not necessary to seek the aid of an expert machinest at any time. There are, however, several joints that must be welded. If the builder will note these and then have them all welded at once the welder will no doubt make a special rate for the complete job. This little tractor is not an experiment, but a proven product that will, under normal conditions, handle any farm job done by two good horses and if a good motor is used it will easily handle a three horse load. It is not advisable, however, to overload the tractor as this would slow down the engine and reduce its horsepower output. The tractor is made from parts of a Model T Ford truck and an old Dodge transmission. Any make of transmission may be used but the old Dodge is preferred for its rugged build and ability to stand up under long grinds in lower gear. The shifting on this model Dodge is just reversed from stand- ard, in other words low gear is where re- verse is on later model cars. If you do not have a Ford truck, but do have a passenger Inventions, July, 1936 | REAR VIEW. OF DRAW BAR ASSEMBLY ~ 5/8"X 3" IRONS ! mai oR 2" ANGLE IRON aero | Sia HOLE OAK BLOCK FORD FRAME = 7 z Ta VERTICAL E BOLT THRU SIDE BOLT THRU BLOCK AND DRAW BOLT TO DRAW BAR—F ONT š : © HOUSING "U" IRON HOLDS ">| DIFF. TO BLOCK & FRAME ale oo 5 CUT OUT [8" FROM AXLE-. SUSPENDED SPRINGS REJOIN AS BELOW PERCH AXLE CUT AND SPLICED WELD WITH CLEAT IRONS RIM TOGETHER LUGS PLACED AT 45 ACROSS WHEEL- BOLT TO RIM WITH 378" ROUND HEADED BOLTS The axle splice is shown above. Since eighteen inches are removed here it is necessary to shorten front springs, too, The radius rod is fastened to bottom of spindle bolts instead of on the top as it was formerly. The flanged rims are buit up from old rims which have been welded together at split joint and lugs bolted on to provide traction in soft earth. car, it will then be necessary for you to obtain a Ford truck differential. Any wrecking yard should supply one with low gears for not more than five dollars. The Dodge trans- mission should be bought for about $2.50. A regular T model passenger car frame is used and the first job is to strip it of all unnecessary parts, then block it up and re- move the rear end which will later be, replaced by the.truck differential. A good . radiator and motor are the important parts of the tractor and to aid in cooling a water pump may be installed. Next block up the front end and remove the front wheel assembly and spring. This is then dismantled. The object here is to narrow it up 16 inches to permit shorter turning. With a yard stick or tape find the exact center of the front axle. [Continued on page 120] 101

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SUMMER SUGGESTIONS FOR MOTORISTS Tubing from Fan to Choke Saves Gas SIMPLE device that will save gas on many cars consists of a length of flexible tubing mounted in the manner shown so as to send a constant rush of air into the choke chamber. On the one end of the tubing attach a metal funnel so that air coming into the engine through the radiator will be forced through the tube. Attach the device firmly to the engine head, using a clamp made of sheet metal, Another bracket is attached to the opposite end and directed so that the tube may be fastened just 144 inches from the choke chamber.—J. Vanderton. ` 12" APART AT CHOKE CHAMBER ingest UX Bolted Steel Bar Holds Garage Doors Open : cea ne CONVENIENT method of holding the garage door WIDTH WERE DEPENDS UPON O a open while the car is being put away recommends M THICKNESS OF DOOR itself to private garage owners. It is made by bending a steel bar to the shape shown and then cementing or anchoring it in the driveway with machine bolts. The FORM, IE WIDE, Ya rule NT bar is bent from a strip of flexible metal—vV. C. Childs. cK A HOLES FOR BOLTS , A Plug Allows Removal of Stray Flywheel Bolts | *” om ros ae OTORISTS constantly annoyed by broken and loose à bolts falling into the flywheel housings of their | DRILL HOLE ‘a FISH OUT cars can now remove them without too much trouble or expense. Bore a hole in the bottom of the flywheel housing slightly larger than the diameter of a bolt, tap _ the hole and insert a pipe plug.—D. L. Wells. BROKEN BOLT WW TAP MOLE AND INSERT PIPE PLUG ce aaa er eee re ee E Fire Fighter Made from Old Pump AS OLD tire pump can be converted, in little time, into a practical fire extin- guisher. Take the pump apart and connect up the two barrels through a length of tubing so that the one tube leads into a check valve in the manner shown. The plunger is re- moved from one of the barrels and a check valve inserted in the opening in the cap. A final check valve is then mounted in the bottom of the other barrel to which the hose _is attached. Drive a wooden plug in the top vent hole in the pump barrel cap so that no leaks result. Extinguishing liquid is placed in the larger barrel and device is ready for use. 102 Modern Mechanix Hobbies &

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TIPS FOR MOTORCYCLISTS

ESTABLISHING CORRECT GEAR RATIOS ENGINE SPROCKET -i2 TEETH

CLUTCH—

GEAR Zer TEETH BOX SPROCKET -14 TEETH 36 x 28 Ree GEAR RATIO=———- = = 6 TO} eee keT— 56 TEETH <- EXAMPLE TO FIND RATIOS GEAR RATIOS decide speed and power. The ratio of your INLET OPENS + DICK EXHAUST motorcycle can be determined. Count the number of teeth on 20° BEFORE ` CLOSES 20° the engine and gear box sprocket then multiply these together. T.b.c. AFTER TOP Next, count the teeth on the rear and clutch sprocket and multiply DEAD CENTER them. Dividing the last figures by the first you will have the j g gear ratio as examplified above. Knowing the gear ratio you can : EXHAUST OPENS 60° find the different ratios required for solo and sidecar use. If a BEFORE BOTTOM 5 to 1 ratio is required multiply the number of teeth in the rear sprocket by the number in the clutch. Dividing these figures by teeth in the gear box sprocket times desired ratio number (5) you know the number of teeth required for the engine sprocket.

INLET CLOSES 60° AFTER BOTTOM DEAD CENTER

CARE OF CHAINS

VALVE ABOVE DIAGRAM ON PIECE OF TIN TIMING BOLTED TO == ENGINE SPROCKET

GEAR BOX SPROCKET REAR SLIGHT SAG WHEEL SPROCKET VALVE TIMING, for best results, can be determined IN BOTTOM readily by copying the above diagram on a tin disc and OF CHAIN attaching it to the outside of the engine sprocket. This done bring the piston to top dead center and place the diagram in the same position. You can then put a center punch mark on the crank case to correspond with it, push 2 in the gears and continue on to the next in the same “i EXAMINE 7 manner. Arrange inlet valve to open 20 degrees before OP INKS MINE Loose top dead center and close 60 degrees after. Exhaust opens 60 degrees before and closes 30 degrees after.

GAP THE WIDTH OF THIN DIME SPARK SOAK CHAIN IN oy a —«<—— PAN OF HOT è e ` TALLOW- CLEAN sA OUTER SURFACE Š CHAINS are a very important part of any motorcycle. No motorcycle should be driven more than one thousand miles PROPER SETTING OF IMPROPER without relubricating the chain drive. To do this requires that SPARK PLUG POINTS SETTING the chain be removed from the. motorcycle and cleaned thor- CARE OF PLUGS oughly in gasoline, then wiped perfectly dry. This done melt AND CABLES enough tallow in a pan to completely cover the chain. Allow SESS the chain to remain in the liquid until all bearings are pene- trated by the tallow. The surplus grease is then wiped off and the chain examined for cracked side plates or loose rivets. In

BROKEN HIGH TENSION WIRE Ay P

mounting chain on sprockets allow a slight sag, but not too i BENG ALONG LENGTH S SOX much or it may work off the sprocket and whip itself to pieces. Lp- \ UNTIL BREAK IS Se | aaa

TERMINAL IN GOOD DETERMINED M es GENERAL SUGGESTIONS for good motorcycle operation include spark SMEAR CLEAN aes plug, breke ae high tension are Vi $ e spark plugs shou e adjuste ROUNDS ER HAND BRUSH so that the gap is between .010 and .014 inch, the thickness of a 10 cent piece. When engine misses at high speeds trouble is due to gap on a plug being too wide. Broken high tension leads rob engine of power and should be checked by bending. Greasy brake linings should be cleaned with a small brush and gasoline.

BATTERIES must receive periodical attention if they are to perform properly. Excessive burning out of lamp bulbs is often due to loose battery connections. In fact, poor connections may result in a generator going bad. To insure perfect contacts scrape off the corrosion on the terminals, attach leads rigidly then coat all metal parts with vaseline to prevent any further corrosion. Inventions, July, 1936 103

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Moisture Gauge Measures Humidity in the Home SCALE WE HARDWOOD BAR ——> VENEER A BASE-4K23x1 13" PLYWOOD a = ‘ ; Y KEEPING the air in your home suff- ciently moist you can avoid colds, pre- vent furniture from becoming too dry and improve the efficiency of your heating system. In order to do this a simple moisture gauge is required and this may be built by anyone from odds and ends found about the home. ` The base of the gauge is a piece of ply- wood measuring 1⁄4”x212”x13”. This may be finished by staining if desired. The heart of BEARING —— the instrument is a strip of hardwood to` which is glued a layer of oak veneering. The veneer absorbs moisture at a different rate as compared to the hardwood strip making the bar bend one way. When the bar dries it bends in the opposite direction. The hard- wood strip measures 1⁄4”x⁄2”x1134” and to it is attached the strip of veneer with the grain running crosswise. Nail or screw the strip to a small block of wood and fasten this in turn to the base. The pointer is made from a straight piece of wire 12” long. One end is hammered flat and filed to a point like the hand on a timepiece. At the opposite end of the pointer, 2” from the end, flatten the wire sufficiently so that a small hole may be drilled to receive a nail which acts as the bearing for the pointer. File the end of the wire opposite the point flat and make a depression in it with a sharp drill. Mount the pointer parallel to the bar and about 11⁄2” to the right. A stiff wire is attached to the wood strip and bent so that it rests in the depression of the pointer. 104 WIRE —— Fs With this simple moisture gauge the humidity in any | room may be determined. The photo at left shows | the completed instrument in operation while the above photo shows the manner in which the veneer strip operates the arm and, in turn, the pointer. Jumping Plug Puzzles Party Guests HERE is nothing that will add more life to a party than this jumping plunger. Offered to a friend, he cannot make the plunger fly into the handle although he is told to hook the rubber band to the notched end of the plunger in order to accomplish the trick. The secret lies in the torpedo shaped plunger knob. Instead of actually catching the rubber band with the notched stick the operator merely lets the knob pass through the finger tips rapidly. The illusion is almost perfect. Make the handle frqgm a wooden dowel 1” in diameter and 3” long and carve the knob acorn shape as shown. Complete by attaching 44”x234” dowel to knob. Constructed from a length of broom handle or regular dowel rod this novel stunt will add interest to any party. Idea is to make plunger fly into handle. Modern Mechanix Hobbies &

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TeS handy multiple purpose tester will make a valuable addition to the experimenter’s workbench and it costs practically nothing to build. Secure a neon bulb with standard lamp base and wire it up in the manner shown. A small wooden box may be used for the case; switch, terminals and socket being mounted on the top. To use the tester for measuring an unknown resistance connect a known resistance to terminals R-R, for example 50,000 ohms and a 2 mfd. condenser tọ C-C. Open switch and connect 90 volts of B current to terminals B-B. Allow and the battery tọ remain connected for a few moments then disconnect it and close the switch. The neon lamp will glow until the condenser has completely discharged through the 50,000 ohm resistance, To use the tester to measure resistance take a slow count while the lamp glows and use this number as a standard. For example: If the count is ten for a 50,000 ohm resistance it will be twenty for a 100,000 ohm size or just five for a 25,000 ohm resistor. To measure the capacity of an unknown condenser connect it to terminals C-C and just reverse the method used for testing for resistance. For instance: Since you know the ccunts for a 50,000 ohm resistance with a 2 mfd. condenser is ten and when this un- known capacity is but five it must be a 1 mfd. condenser. To identify current connect leads to ter- minals R and C attaching these, in turn, to the current supply you wish to test. If the current is direct one of the electrodes in the neon bulb will glow brighter than the other indicating the positive side of the line. To check R.F. currents connect a 3-inch diameter 2-turn wire loop to R-R and a C battery to B-B. The lamp will glow when loop is brought into R.F. field. Inventions, July, 1936 Costing less than one dollar to build, this simple tester is valuable in testing the capacity of condensers, polarity of currents, value of unknown resistors the locating of radio frequency currents in radio receiver circuits. Shortwave Attachment Easily Made HIS simple attachment will bring in police calls on many types of radio re- ceivers intended only for broadcast recep- tion. Wind a 15-turn and’45-turn coil on a 1%-inch diameter coil form, connecting the inside leads to the set chassis. Connect the top of the smaller coil to the antenna and the bottom lead to the control grid of the detector tube. Tune in stations in the-usual manner only. dialing more slowly. . CATHODE PRONG OF _ | DETECTOR TUBE ANTENNA CATHODE jiii CONTROL GRID CONTROL GRID OF +» DETECTOR TUBE Attached to the detector tube of most electric radios this simple coil device will bring in police broadcasts. While it will work on many sets it is not guaranteed to work on all. 105

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“@rystaldyne” 6 VOLTS N H ANTENNA —*\// 118 TURNS NO. 28 ENAMELED B+ 135 VOLTS Bt 90 VOLTS HAT youth at some time or. another hasn’t wished for his own personal radio receiver with which he could listen in to his favorite program. The little cigar box re- ceiver described here was designed by a high school student just for this purpose. Ex- tremely simple in construction the set pos- sesses unusual tone quality through the use of a fixed crystal detector feeding into a type 39 or 44 Pentode tube. On local stations the set has sufficient volume to operate a small loudspeaker and on distant stations earphones may be used. Except for the tube and crystal the set costs practically nothing to build. Parts from old battery sets were used to supply the neces- sary materials for building the “Crystaldyne.” A cigar box served as an excellent chassis; all parts being mounted inside and readily ac- cessible by raising the lid. The tube and tuning condenser are the only exposed parts and are mounted on top to add balance to the set. The A. F., transformer and coil form are attached to the side of the cigar box with short brass machine screws. Three holes drilled in 106 Above pictorial diagram shows how set is wired. A CIGAR BOX RECEIVER 3 70 | EARPHONES CRYSTAL a. F, TRANSFORMER ` B- Hs © VOLTS B+ 90 V. B+ 135 V. The schematic circuit for Crystaldyne is shown above. Constructed from junk parts this novel cigar box radio can be built at practically no cost. Either batteries or a B Power Supply Unit can be used to furnish current for the receiver. the front of the box provide a mounting for the switch, 12 ohm filament rheostat and 500,000 ohm potentiometer. Fahnstock clips are mounted along the rear of the cigar box to allow for connection to the power supply. Wind the coil on a 114” form using No. 28 enameled wire. The coil is mounted to the side of the cigar box with screws and studs. The crystal detector being of the fixed type needs no adjustment. Since heavy wire is used to wire up the circuit the smaller parts require no mounting; the wire holds them rigid. ` The simplicity of the circuit makes it almost foolproof in operation. Unlike the usual set it will not get out of order easily. Some cau- tion should be exercised, though, in con- necting the power supply so that connections are properly made. Modern Mechanix Hobbies &

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The unusual sundial as it appears when completed. At right is shown the manner in which the jig insures the sword being mounted at the correct angle, The sword is anchored to shield with plastic wood. Don’t remove jig until plastic wood dries. | | i SHIELD CHAMFERED CLEATS. n h i) \i 1 | BACK oF j =a —L G | MAK 6 | MAKE 18, CUT NUMERALS a Ym SHEET LEAD ty | MAKE DOTTED LINES El ANGLES FOR, 42° LATITUDE VIZ: 90-42% 48° SHOW NUMERAL SHIELD ne EN i À N ę IDES LOCK © 90° MINUS LATITUDE rAr 90442548 PROTRACTOR FIG. 2 al | Lay out the shield according to the top plans. The hour lines are laid out on the shield with a protractor in the manner shown. Cut the numerals from sheet lead. Inventions, July, 1936 ` shows the manner in OA NOVEL SWORD and SHIELD SUNDIAL With a protractor lay out the divisions ac- cording to construc- tional details. Fig. 2 which this is accom- plished. Paint the hour lines on the shield neatly with; black enamel. Pain the sword aluminum, the shield bronze. Ro charm may be added to the garden gate, garden wall or doorway by making a sundial like the one here described which resembles a sword thrust. into a shield. This sundial, of the vertical south type, is easy to construct. And when correctly laid out is actually a good time-keeper. ` To construct the dial obtain a piece of 1” oak stock 157x1112” and on this lay out the pattern for the shield shown in Fig. 1. The sword is made from a piece of oak 16”x136”x5e”. Drill a 14” hole through the width of this piece at the center and 4” from one end, then chamfer the blade on all edges as shown in the sections in Fig. 1. The section which forms the handle is rounded as shown; the blade tapers slightly and the “point” end is cut off at approximately 45 degrees. The ` hilt pieces are made from small oak blocks drilled at the ends to a depth of 34” with a 1⁄4” drill. These pieces are then shaped and rounded either with a rasp and sandpaper or by whittling. Now cut out notches in the blade which will snuggly receive the hilt pieces, insert a short length of 14” dowel in one of these pieces, gluing with a waterproof glue then assemble. With a narrow chisel cut out a hole at the center of the shield 2” from the top edge. This hole is cut at about 45 degrees and the sword should fit into this hole. Now from 1” oak stock 2” wide cut out two cleats and chamfer the edges then screw these to the back of the shield. A On sheet Îead lay out the Roman numerals. These may be cut out with tin snips or on a jig saw using a [Continued on page 126] 107

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HELPFUL TIPS FOR FISHERMEN RUBBER BAND BWide PUNCH HOLES 4 FROM TOP OF CAN ( == found. Odd Parts Form Practical Anchor A OLD furnace grate, several bolts and a piece of sheet iron can be formed into a practical boat anchor which will hold even a large boat securely. To the grate attach two flukes made from pieces of 4 by 8-inch sheet iron. Stove bolts are used to hold these firmly in place. An 18-inch length of strap iron or an old telephone cross arm brace serves as the bar for the anchor.—Geo. A. James. SCREW TOP COVER PA "RUBBER HOSE | INSTALLATION OF, HOSE, \ sy AIR INTAKE) TO WINDSHIELD INDICATED BY DOTTED PES = Z wiper A q = =x JA COPPER TUBE | WATERLINE END OF TUBE "FROM BOTTOM TWO GALLON METAL CAN Steam Renews Feathered Fishing Lures ERY often the fisherman is confronted with an assortment of fishing lures which appear too matted to be of further use. New lures are expensive and to throw the old ones away would result in many sportsmen doing without any for possibly some time. In many cases it is possible to restore old lures to their original luster and fluffiness in a few minutes with little or no work being required to effect the change, Take the old lure and hold it over a tea kettle spout so that the live steam strikes the feathers or hair. The steam will cause the mass to open and take on fluffy appear- ance.—Joseph Petr. 108 Rubber Bands Prevent Cans From Leaking HO hasn’t at some time or other went on a camping trip only to be constantly bothered with the contents of open cans spilling and ruining all the food in the vicinity. Since this trouble was apparent especially with canned milk and since this item was one of the camping necessities it was impossible to dispense with it. Some means of sealing the can had to be A length of old automobile inner tubing lying on the ground gave one of the campers an idea. Taking a pair of shears from the supply kit he cut off a band one-half inch wide, then punched a hole in each side of the can about one-quarter inch below the top. By slipping the inner tube band over the top the holes were sealed perfectly and no contents escaped.— James W. Clift. arxa" SHEET IRON BRACE FROM TELEPHONE AUTO 5 RING CLAMP Vacuum Tank Airs Minnow Bucket TWO-GALLON can to which has been soldered a short length of 34-inch copper tubing on one side with a long piece of 4%-inch tubing attached in the center makes a good minnow bucket. The windshield wiper hose is disconnected and attached to the short tube on the can.—J. Rae. Mechanix Hobbies & Modern

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A Treadle Operated Swing For The Lawn END FRAME ASSEMBLY je = 8) " 1" ‘ “4% 1% STRAP IRON fj This novel. lawn treadle swing may be constructed by any handy man at practically no cost. An old auto seat forms the cushion while any lumber may be used for the construction. Dimensions for the swing's end pieces are above. Old pipe forms the swing support. HIS veranda or garden swing not only is a comfortable and ornate piece of outdoor furniture, but it offers conveniences not found elsewhere. The swing is oscillated by putting a gentle pressure to bear upon the foot-board. The operating mechanism is designed so that there are no finger-pinching or clothes-mangling joints. Because of the parallelogram suspension the table-like arms are always horizontal, per- mitting safe afternoon tea service in the chummy swing. Although this is a rather imposing piece of furniture, the cost of building is trivial, and the owner of home workshop equipment will delight in the work. The rear seat cushion and back upholstery from a “quality” junked auto provide the cushions for the sedan swing. The longitudinal dimensions vary with the particular auto cushions used. Particular attention is called to the end elevation which depicts the mechanical means of operating the swing. It will be seen that the rear suspension chains are attached to bars which are free to oscillate. These bars are linked with rods and levers to the treadle- board. A stop pin to the bars restricts the movement of the treadle-board to about 4 inches. It will be noted that when the swing goes forward the treadle-board will rise. If, at the end of the forward oscillation, the Inventions, July, .1936 OSCILLATION RANGE = OF TREADLE BOARD BACK STRETCHER 56x24 RUBBER SLEEVE - .ON LAG SCREW TREAI ~BOA Above is shown an end view of the swing’s oscillating bar assembly and the manner in which it is constructed. Pushing the treadle board lightly with feet sets swing into motion. treadle-board is depressed, the rear pair of suspension chains are thrown back con- tributing a slight added pull to the swing. The sedan swing may be suspended from a pipe frame-work like the one shown. The construction is shown sufficiently clearly so that the prospective builder can adapt it to his swing. A light framework of pipe serves to support an awning. - 109

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An examination shows the paint above coming loose from the wood in large flakes. A mag- nifying glass proves that the coating disinte- grates by crack- ing, curling and flaking up from the original paint. 110 PAINT WISELY On three sides of the house pictured here, the paint cracked and scaled badly— see left photo. On_ the fourth side, the side fully exposed to weather, paint gave excellent service, as shown in lower left photo. On the bad sides the wood carried six coats of paint, the good side only three. - Originally painted with — lead and zinc and sub- sequently repainted with a titanox, lead and zinc type paint, photograph above shows paint failing in an unaccountable way. Going to paint your home? Ex- pect trouble—blisters and such? Forewarned is forearmed, and this article may save you trouble. OUSE paint which cracks and peels in less than two years after application is fail- ing unreasonably soon. If the previous coat held up well; if you bought the best quality paint and had it administered by reliable. craftsmen, you are probably bewildered to know why. the present coating has failed to keep its bargain with you. The reason may be one of a number which the United States Forest Products Labora- tory at Madison, Wis., has discovered respon- sible for failure of exterior paint jobs. If you are one of those owners, the re- painting of whose home in the next year or two is an utter necessity, let the laboratory’s findings safeguard you from the exaspera- tion, and, worse still, unnecessary costliness, which are the outcome of mistaken painting practice. With a reliable painter as con- sultant, you can go a long way toward diag- nosing the paint ills of your own home if you compare its symptoms with typical case histories recorded by the laboratory. It is bad policy to try to apply a white or tinted paint over brown, green, or deep red. He who does so, does it at the risk of early The house at the left was built in 1931 and painted with pure white lead, a satisfactory job. In 1934 it was re- painted with a hard, quick-drying paint. The above photograph was taken only a year after it was applied. Modern Mechanix Hobbies &

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and SAVE MONEY a otal ESA k jeng sin of paint This house is a chronic peeler, for the side walls get wet every winter, making new paint jobs blister and peel, as shown in the circle. The paint job will never satisfy until some way is found to keep mois- ture out from behind the painted boards. “disagreement” between the colors. Even between whites and tinted whites, incom- patibilities may exist, especially when dif- ferences in amount and kind of pigment are marked. If your house has always been painted with the soft type of paint, but no new paint has been applied for seven or eight years and the coating has thoroughly disintegrated, you are in luck. Have the painter merely dust off loose chalk and dirt, perhaps cleaning a few places where soot or grease from oil-burning furnaces have collected on shaded parts of the building, and brush on new paint. Two Inventions, July, 1936 This paint neglected house is typical of those on which white paint is applied over a dark color, a fine example i incompatibility. by M. B. HOPKINS The house up above was not painted for eight years. From a distance the paint looked shabby. A closeup photo reveals the paint worn down to bare wood. Two new coats will fix it up fine. coats of new paint are necessary. As a rule, the new paint should be of the same soft type previously used because the chances are that the job will again pass through a long period of neglect before it is repainted. If, however, you feel that in the future you will repaint before the coating disintegrates badly, it is practicable to apply the harder types of paint over this surface, The first coat of new paint should be thinned with linseed oil and rela- tively little turpentine or other volatile thin- ner, using not more than 1% gallons of total liquid to 1 gallon of soft paste paint. If your house has been painted and two or three times repainted with paints of a fairly hard type, but you have waited a little too long each time before calling in the painter, you’ve no doubt found successive repaintings less and less durable. If close inspection shows that the paint is disintegrating by flaking and scaling rather than by crumbling; if at the edges of the cracks the coating curls upward and eventually falls off leaving a patch of bare wood; if the coating still clinging to the wood has jagged and inse- [Continued on page 130] 111

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IDEAS FOR USE ABOUT THE HOME

ZEA “RUBBER HOSE WEIGHTS

VALVE STEM\BOARD LESS VALVE for Ja SLOTS E Cia ee Ga BE Ners wj i WOOD SPOOL Z DEET J iSe Ji wooo i A hose CLAMP

Farm Gate Built From Auto Parts PRACTICAL gate for farm use can be very easily built by any ambitious crafts- man from a pair of Model T Ford rear ends. The gate proper is constructed from 2 by 4 or heavier stock and mounted on the wheel hubs with strap iron clamps. The tie rods act as braces for the center of the gate. The drive rods form a very rigid support for the outer sections so that the gate will withstand rough treatment. Concrete bases provide a suitable foundation on which the rear ends may be installed.—Al Cole.

BROOMSTICKS OR —<—— RON RODS — w CARDBOARD INSULATORS, OR CORD SHORT SECTIONS ADJUSTMENT OF PIPE TO WHICH CORD IS TAPED LAMP SUSPENDED ABOVE BENCH ~

Inner Tubes Form Changeable Roadside Sign A and old inner tubes. aluminum bronze. to the inner tube belts with small brads. 112 NOVEL and practical road sign, suitable for the farmer to advertise his produce, may be put together in a few hours using random lengths of pipe, a few fittings The pipe is made into a frame similar to the one shown after which it is painted with The inner tubes are next cut into wide belts so that they may be stretched over the frame. The signs are painted on lengths of plywood and attached Plywood fastens to each side of the inner tube strips —J. Ott. Pump Makes Handy Paint Sprayer N EMPTY thread spool, an auto inner tube and a small salad dressing jar are the only materials needed to build a practical paint spray for doing odd jobs about the home. Attach a copper tube to the jar lid by soldering in place. The spool serves to hold a similar copper tube rigid for the air supply. This is mounted to the jar top with a tin clamp. An old inner tube provided with an extra valve serves as an air supply for the sprayer.—L. Plebanek.

CONCRETE BASE— A

Adjustable Light Slides On Cord IGHTING the workbench is one of the most trying tasks encountered by the home shopman. A sliding light is no doubt the most practical way to’ light the workbench. Install two rods in the ceiling and between them stretch a steel wire using turnbuckles to make it taut. Empty spools are threaded on the wire and to them the fixture cord is attached with friction tape in the manner illustrated—W. J. Brown.

WOOD STRIPS ON WHICH LETTERS: ARE PAINTED y

Modern Mechanix Hobbies &

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Making Novelty Jewelry cAt Home These novel pieces of jewelry may be fashioned from inexpensive silver metal using only simple homemade tools. The number of designs possible are limited only to the maker’s imagination. Gold and silver wire add interest to the various styles of charms, rings and bracelets. JEWELER'S -TOOLS NAIL SETS VICE ~ FOR WORKING JEWELRY RECESS CUT IN SIDE \ OF BENCH m e e e 1 il METAL IS HELO IN NOTCH WITH FINGERS OVERLAID Here are the tools required for making the many interesting ` € R — AT POTTOM pieces of jewelty described. An inexpensive jewelers’ saw, a a i few reshaped nail sets and a simple vice are all you need. ITH no past experience anyone the least bit handy with tools can produce in- teresting pieces of jewelry ranging from rings to small charms. A jewelers saw and a few nail sets, reshaped as shown by heating then retempering, are the only tools required. Initial rings may be cut from 20-gauge silver and fashioned to the desired size. The same f : metal may also be used for making small TEDDY BEAR charms. A simple vice made from hard wood — |evepHant in the manner described will simplify working the metal especially when cutting out designs. 4 E RING CUT DOWN FROM ORIGINAL THICKNESS J CHARMS. . , fe} © SCOTTIE PARROT . $H (CO) RING FOR CHAIN SUGGESTED. CHARMS After choosing a design for a ring or pin it oN should be drawn full size on paper and this in CHICK PUP r ilver sheet. The design can tum glued to the silver s t A E S gne Charms such as these are cut from 20 gauge sheet silver using then be cut out accurately with the jewelers oniy a jewelers eer be daigai are irst drawn on paper ini 4 34h ‘ which in turn is glued to the metal. ter cutting, the paper SAW. After gaining skill with the more simple may be soaked off. Novel rings that may be adjusted to fit articles silver or gold wire may be substituted any finger are also cut from the same metal. Initials, club for making initialed pins and bracelets A and lodge emblems and decorative designs may be inscribed on face of rings by using the nail sets to form the impressions. great number of designs may be used. Inventions, July, 1936 : 113

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Combination Door-Window Adds To Home Conveniences ~ WHICH DOOR CAN BE OPENED In order to preserve the symmetry of the outside of the home one constructor struck on the idea of a door patterned after the windows. exit. ALBOA ISLAND residents vie with each other in the simple symmetry of their California homes. Consequently, one owner’s worry is easily imagined. His new home was complete and he had to add another door. He was afraid the new door would throw off one side of his tastefully designed home. Yet there had to be a door. What to do? A carpenter was called in—a carpenter who had formerly worked on a major studio lot in Hollywood. He knew just what to do in such an emergency. “Why not,” he said, “make a door that will resemble a window?” Yes, that was it, a window door. The door itself was simple to make. Just a window frame topping the lower construction, and blending with the sheathing of the house. But the hinges presented a harder problem, for the house owner wanted this disguised door to swing out and clear the wall of the house. But again the stage carpenter had the solu- tion. He had the blacksmith create heavy hinges of iron, and attached these to the middle of the door and to the door frame itself. The sturdy wood construction, supple- mented by the heavy iron hinges prevents the door sagging or getting out of alignment even when the fogs come in from the sea. 114 Special hinges were provided so as to permit the door to swing out from the wall and provide an additional The above photographs and drawing show how this type of construction might be applied to other types of dwellings. Fruit Jar Makes Decorative Lantern HIS attractive lantern is made with an ordinary preserve jar. Other materials required are four supporting metal rods, threaded at one end, and some sheet steel. A piece of the sheet steel is formed into a 6-inch wide by 3-inch high cone, and the four rods are welded or soldered inside the cone. The base is made 5 inches square. Make the jar opaque, using an emory wheel. While costly to purchase a lantern similar to this, one can be built in the home workshop from odds and ends. Ordinary fruit jar and pieces of scrap metal comprised the materials.

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SB» spot pos? ka a E cee are Tha nk Y. ou fo rM entiont nang Mod ern Mi echant. vir H obbies a md I nvenii tons W hen n Wri itin g to Ad verii sers 115

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NOSES In this department the Photography Editor will answer any question or problem related to cameras of all types, enlarging, printing, developing, taking pictures, and the various phases of home movie making. When sending questions to this department, be sure to include a stamped, addressed envelope in case space not permit publication of the question and reply on this page. Send all inquiries to the Photography Editor, Modern Mechanix Hobbies & Inventions, Greenwich, Conn. CAUSE FOR SPOTS ON PHOTOS I find that negatives from a recent roll of film show large, round spots in the center. Some are black, while others are thin or nearly clear. Was this trouble caused by the film or by the camera? —J.R.M. The large spots which you mention were caused by the camera shutter being opened after the bellows had been collapsed. Where spots are light the exposure was so great that WHY NEGATIVES ARE MOTTLED In some photo work done recently I was sur- prised to find a mottled effect on my negatives. I cannot understand the cause of this and would, therefore, appreciate some explanations.—T. R. H. Mottled negatives may result from the paper backing of the film taking up moisture and transmitting it to the film before develop= ment. The cause of the moisture was due either to the films being stored in a damp a reversed image occurred. MAKING THE MM PHOTO ENLARGER In building the photo en- larger described in the May, 1936, issue of MM I should like to use a special lens in- stead of the lens from my camera. What is the best speed and, to, do you advise the use of a diaphram?— D. N. B. Lens rated at f: 4.5, £:5.6 or f: 6.3 may be used to ad- vantage with the enlarger. The smaller the f-value the shorter will be the period of exposure. The diaphram is advisable if very sharp enlargements are desired although very good work can be secured from a lens which is used wide open. It is a good rule to use a lens having a focal length similar to that used by the camera that took the pic- ture. For miniature nega- tives the focal length should be about two inches and for vestpocket size or slightly larger the. focal length of the lens may be three inches. In no event, though, should the lens be slower than f: 6.3. 116 THIS PHOTO WON $5 QUPLICATOR FITS OVER CAMERA LENS These twins certainly look alike, but actually they are one and the same person. his novel picture won for Henry Sternberger of Wil- mington, N. C. this month’s prize of $5 for the most unusual photo. A duplicator, similar to the one shown was used on an ordinary folding camera. The camera was mounted on a tripod, then the duplicator attached over the lens and the picture snapped at one-hundredth of a second. The duplicator was then turned, to cover the other half of the lens, the girl changing her position and the camera again snapped to expose the other half of the film, this time at one-twenty-fifth of a second. place or used in a climate where the humidity was extremely high. The mottled effect might also be caused by insufficient agitation of the film in the developer or from the use of a developer that con- tained considerable sedi- ment. PICTURES IN RELIEF In taking pictures of various subjects some time ago I was surprised to find that upon developing the film some of them came out in relief. When prints were made of these very unusual effects were obtained. Can you offer an explanation for this?—W. E. T. Since the developing you refer to was done some time ago the developer was evi- dently of the pyro type. This developer has a tan- ning effect on the gelatin. The result is that the film would often swell where it was not tanned or hard- ened and this would pro- duce a relief effect. Each month MM pays $5 Jor unusual amateur photos or pho- tography kinks sent in by a reader. Send all entries to MM Photography Editor, Modern Mechanix Publ. Co., Greenwich, Conn,

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Snapshots this size ODAK DUO is ideal for the miniature camera enthusiast. It has all the advantages of a small, pocket camera...economy, convenience, short focal length—yet it yields a larger picture: Makes sixteen it f : 156x214 inch pictures on a roll of 620 Kodak Film cHOOSETHE RIGHT FILM ... actual size above. Kodak Verichrome Film There’s no need for posing with Kodak Duo. The isan excellent all-around Compur-Rapid shutter, with speeds up to 1/500 Picture maker. Has great second, sto ps action—covers aoe latitude...guards against ? any exposure require- exposure errors. Kodak ment. The keen f.3.5 anastigmat lens makes snap- Panatomic.. . extremely shots in almost any light—even at night, with Kodak fine-grained, designed * “SS” Film and Mazda Photoflood bulbs. Com- pletewithdepth-of-focus F R EE scale, optical finder. Price $57.50. At your dealer’s, KODAK MINIATURE ENLARGER, MODEL B—Ideal supplement for the Duo. Makes enlargements from Duo negatives up to 16x21 inches. Paper cabinet base optional. Enlarger, Kodak Anastigmat f.4.5 lens, mask- ing paper holder, iris diaphragm, magnification scale, exposure cal- culator, $82.50. Without diaphragm, $67.50. Paper cabinet base, $10. Name Address City. especially for miniature cameras. Makes striking enlargements . . . Kodak “SS” Panchromatic ... extra speed for difficult pictures. Ideal for snap- shotsatnight with Mazda Photoflood bulbs. a booklet you'll want in your photo library Gives complete information about minia- ture Kodaks and enlargers. ter, N. Y. Write today . . . Eastman Kodak Company, Roches- State. M. M. 7-36 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 117

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Master of one of the strangest hebbies in the world is J. A. Adams of Roseville, California. Using sand of various hues he places it in specimen jars to form interest- ing pictures of flowers, people and other objects. in some of his pictures 27 different shades of sand were required. The only tools used by Mr. Adams to form his unusual pictures are several hick- ory sticks and a spoon for pouring the sand into the odd shaped jars. Desiring a collection of all the birds, fish and animals in his state Anthony Dehevic, Waukee- gan, Illinois youth, took up the study of taxidermy during his spare time. Using a set of books secured from a correspondence school he began with small birds and fish gradually adding other animals to his collection until now he has a wide variety of ihe more common species, all attrac- tively mounted on rustic plaques. ADLETS FOR HOBBYISTS (See regular classified section for rates and other information.) STAMPS UNITED STATES—Elaborate Pricelist free. TWO Fine Airmail Triangles—Iceland triangle and new Bi-colored Mozambique triangle, and fine packet including Ubangi, Chad, Gabon, Inini, St. Pierre Tozo; Senegal, Herzberg, MM 197, Grantley, Elmhurst, Ill. savages, ships. and animal stamps. nly 5c to approva 3 r $ > A fais applicants, Potomac Stamp Co., Dept. 907, Washington, Hegeleod pacate, Pook 1E Approvals. 10c. 75 different 30c. Seidenberg, Baroda, Mich. STAMPS sent on approval. Quality at low prices. 50 DIFFERENT Stamps cataloging over $1.00 only a dime to approval applicants. 20,000 different stamps at prices ranging from 1c. All stamps guaranteed genuine, fine selection of U. S. revenues at ic and up. Address F. G. Stein, Dept. 214. 7360 N. Seeley Ave., Chicago. TRIANGLES—New Bi-Colored Mozambique airmail tri- angle; Bolivia and Guatamala triangles, smallest in the world; and the attractive Costa Rica triangle. All four “hard-to-get”? triangles for only 5c to approval applicants. Arlington Stamp Co., Dept. 907, Bethesda, Md. BRITISH TURKISLANDS—Also Congo’s—Montecarlo— Nigercoast—U ganda—Djibouti— Ecuadorian — Ivorycoast — Ubangi—Countries collectors need. Free for 5c postage. EMPIRE STAMP SHOP, Dept. MM., TORONTO, CANADA. AMAZING Caucasian Collection of 24 stamps from Azer- haijan. Transcaucasian Federated Republic, Georgia and Ar- menia—cataloguing $2.00—only 10c to approval applicants Viking Stamp Co., Williamsburgh Bank Building, Brooklyn, Na Fa i LARGE SPANISH Ship stamp, Azerbaijan, Cameroons, Chad, Dahomey, Ubangi included in packet of 57 stamps. All for 5 cents to approval applicants. Swedell, 3129 Gar- field Ave., Minneapolis, Minn. SCARCE SIBERTA, Two Russian Levant. Far Eastern Republic cataloguing $.35; interesting Soviet Packet--- Everything 5c to approval applicants! Saxon Stamp Co., Albee Bldg.. Brooklyn, N. Y. 115 WORLDWIDE STAMPS: Asia. Europe, Africa, etc., Pictorial Set FREE! Minnesota. STAMPS! 100 diff. 3c; 500 diff. 35c; Illustrated Album (4000 spaces) 22c. Tatham Stamn Co. (D9) Snringfield. Mass. 25 UNITED STATES Stamps Free to new approval ap- plicants sending 3c postage. Brownie Stamp Shop, Dept. M, Flint, Mich. ee Sp British Colonials, 3c to approval applicants. Extra- Hunziker, Box 225-Ę, Minneapolis, 1.000 diff. 90c! Approvals sent. ALBUM; 215 Stamps; 1000 Hinges; Tweezers; Stockbook. All 60c. Burtis Co., Saratoga, N. Y. COINS UP TO $2,000.00 for 1799 Large Cent, 1793—$750.00, Other dates to $50.00 each, 1796 Half Cent $250.00, Others to $30.00 each, Flying Eagle Cents to $20.00, 1860 Cent to $50.00. Cents of 1861, 1869, 1870, 1881, 1890 to $20.00 each, 1859, 1866 to 1875, 1909 to $10.00 each, Lincoln Cents to $35.00 per 100, etc. We guarantee to pay the World’s Highest Price. Send dime for this complete large illustrated list before sending coins. Romanocoinshop, Dept. 560, Springfield, Mass. (In Business Since 1927). $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. COMMEMORATIVE $s. Lincoln, Texas, San Diego, Oregon, $1.50 each. Illustrated Catalogue 25c. Norman Shultz, Salt Lake, Utah. FREE. Foreign Coin, Banknote and Large Illustrated coin catalogue, for 4c postage. Approvals sent. Tatham Coinco, Springfield-9, Mass. ; peA OLD MONEY Wanted. $5.00 to $2,500.00 each paid for cld coins. Buying catalog 10c. Robert Cohen, Box 483, Muskogee, Okla. COINS, Beadwork, Indian Relics, Minerals, Books, Curios, Stamps. Catalogue, 5c. Indian Museum, Northbranch, Kansas. INDIAN CURIOS 16 ARROWHEADS, Scalpingknife, Gempoint, Spearhead $.99—110.000 Bargains: Relics, Firearms, Antlers. Photo- list 10c. Paul Heikes, Rutland, Illinois. SENSATION: Airmails from 10 countries; U. S., South America; Pictorials 10c, A. Steele, Marlinton, W. Va. 118 15 GOOD Indian Arrowheads 50c. Tomahawk head 50c. Catalog 3c. H. Daniel, Dardanelle, Arkansas. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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RAPID FIRING OF FORD V-8 DISTRIBUTOR AT 60 M.P.H. Wuisk along the highway in a Ford V-8 at a mile a minute and the engine is taxed but little. But when the speedom- eter is saying sixty, a small but vital mechanism under the hood is providing 12,360 sparks a minute to ignite the fuel mix- ture. The distributor must fur- nish hot, fat sparks at precisely the correct intervals for efficient performance and economy. Compare these 12,360 sparks to the 1440 photographs which pass through a modern motion- picture projector in the same This special testing machine checks the distributor for timing, automatic advance, and vacuum brake setting. Ki This gage makes sure that the distributor bearing is at right angles with the Fics of the advance housing flange. time—or to the 3600 ticks of the second-hand on your watch. Then you will have an idea of the important job done by the distributor on a Ford V-8. Yet a Ford distributor sel- dom needs attention. After thousands of miles of use, if it should require repair, your Ford dealer wili exchange it for a dis- tributor that has been rebuilt completely at the Ford factory. Then you get the benefit of factory inspection and recondi- tioning, instead of local repairs—workmanship by men who have every needed tool or machine FORD MOTOR 12,360 Sparks per Minute at hand. Parts which do not pass their minute inspection in every respect are rejected, and replaced with new parts. The exchange distributor costs little more than the conventional operation of changing points. Every reconditioned Ford distributor must meet the per- formance standards of brand- new distributors. That’s one of the reasons why the Ford Ser- vice Exchange Plan, which also includes many other important assemblies, is so popu- lar with Ford owners. It saves them time—it saves them money. COMPANY Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 119

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Radio Servicemen who build their own radios and radio devices know that dependable parts by responsible manufacturers are essential. That’s why so many come to the world’s greatest radio SERVICE organization—for here not only are you assured of quality —but fastest possible service plus lowest WHOLESALE prices! Naturally we can supply parts for all radio sets and de- vices described in any issue of Modern Mechanix. FREE RADIO CATALOG Lists hundreds of items needed by every radio fan, amateur and experimenter, Thousands of parts, kits, sets and acces- sories. All leading manufacturers. It's Free, Just ask for catalog 63-G22n. WHOLESALE RADIO SERVICE CO., INC. 901 W. Jackson Blvd., Sniega. m. 100 Sixth Ave., New York, N. 430 W. Peachtree St., N. W. Atlanta; Ga. APWCTTE RADIO --- BRANCH --: WANTE MANUFACTURERS On small or large seale, by old established firm to cast 5 & 10c Noveltles, Ashtrays, Toy Autos, etc, No special place or experience necessary as we furnish full instructions with moulds. A rare opportunity for these times so if you are over 21 and want to devote your sprre or full time to profitable work write AT ONCE for full details as we are now closing arrange- ments for 1936 supply of our goods. METAL CAST PRODUCTS Co. 1696 Boston Road, Dept.2, New York, N. Y HIGH POWERED TELESCOPE GENUINE AMERICAN MADE BROWNSCOPES Most powerful made for the money! 15 power long range telescope. Can see moon's craters or time on pocket watch a block away. 5 sections. Approx. 3 ft. iong Fine lenses. Drass bound. Can be used: as Bx only" microscope. Vol. Magn, 1.69 postpuld C. a a G K ag, and 30. imes, closer e Only $1. os Spostpatd. Catalog: of Microscopes, Binoculars, etc., free. BROWNSCOPE CO. Dept.77,234 Fifth Ave., New York, N,Y. Go dit X JBS Village Carrier POSTMASTER SALARY P. O. Laborer ? Seamstress R. F. D. Carrier Auditor Speoisl Agent Stenographer U.S. Border Patrol () Customs Inspector () City Mail Carrier Telephone Opr. P. O. Clerk Watchman Matro Meat Inspector Secret Service Opri ) File Clerk Send me FREE particulara * ‘How. to Qualify for Government Positions’? marked ‘‘XK’’. Salaries, locations, opportunities, etc. ALL SENT BREE. 120 Build “Handy Henry” [Continued from page 101] Then measure 8 inches each way from the center, or in other words cut a 16-inch piece out of the middle of the axle. A hack saw will do the job. The axle is then welded together. Another way that will save the cost of welding is to butt the axle together and bolt an iron on each side, like cleats, running the bolts through the iron and axle. This method is plenty strong as there is no weight directly in the center of axle. The front tie rod is next. Unscrew the adjustable end and cut 15144 inches from this with a hack saw—rethread the rod and screw the adjustable fitting back on and align the wheels. The small steering rod has 7 inches cut from it and it had best be welded. Lay it aside as there will be a few other things to weld later on. The front spring is now shortened. Only five short leaves are used and instead of the spring shackles hanging down from the perches they are up and on top as shown in the photo. The object here is to raise the front end higher so as to permit easier crank- ing and the use of longer spring leaves. The lower main spring can be cut and welded, however the one used here was made from two old lower springs utilizing one shackle hole in each spring. These are cut 20 inches in length, measuring from the center of oil hole on shackle end. They are then lapped over each other—heated in the center to take out the temper, and a 3%-inch hole drilled through both pieces for the center spring bolt. The other four leaves are then all bolted to the main leaves as in the original spring and spring clamps used at each end. The next job is to install the Dodge trans- mission. First the front stub shaft is removed from the transmission and squared up to fit snugly into a Ford universal joint, which is used next to the motor. The drive shaft and housing is removed from the truck differ- ential and the drive shaft may be discarded. The housing is used by cutting a 21-inch length piece from the bell end measuring from the edge of the bell back as shown in the drawing. This is then welded to the small metal bearing cover on the front of the trans- mission. This completes the front universal unit and the transmission may now be set in place and bolted to the motor with the usual bell collar. The shift, however, will have to be blocked up while this i is done and also lined up to fit the transmission brace. The transmission is rigidly braced by using the old rear frame member from the T pas- senger car frame. This is already curved and is bolted to the front of the transmission and to the under flange of the frame with [Continued on page 123] Tractor Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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WHEN YOU BUY THE Pra ə Risking money on unknown razor blades is no fun. Buy a known quality blade — Probak Jr., product of the world’s largest blade maker. This blade whisks off bristles easily, quickly. Costs only 10c for 4. Ask your dealer for Probak Jr. PROBAK JUNIOR ERE the ancients gifted with | strange powers of foresight? Their § amazing predictions have startled the scientific world. Astounding is the rev- § elation that they possessed a secret | wisdom for the supremacy of man and ihe mastery of life which has been pre- served throughout the ages. Let the Rosicrucians explain how you may share Í this heritage of learning by writing today for the fascinating free Sealed | Book. Address: Scribe K. O. N. The ROSICRUCIANS San Jose (amorc) California NOT a religious organization RSAL AuTO TRAILER HITCH New adjustable lock-type ball socket design. Always tight against ball. Elimie nates jerks, wear and danger. Sariy. "cawe SCIENTIFIC BALLIOINT HI i stantly. Can’é come Malleable iron, construction glves extra strength. ae æ BUMPER COUPLER. SCAMP 95c \ o Fits any bumper. in a jiffy with 5. only a wrench, (without Ball uticed ball that comes with Hitch.) Traller Hitch and Bumper Clamp Complete $2.45 Prices quoted cover dellvery in U. S. A. only. Order Direct Today. Fully guaranteed, Send cash en M. O. today or write for Free illustrated folder. EQUIPMENT MFG. CO. 313 Locust St. St. Joseph, Mo. FACTORY SALE! Electric Welders OUR BIGGEST BARGAIN! _ 1000 AMPERE SPOT WELDER Arewelding $0).19 f Arc Welding Attachment Home craftsmen, sheet metal and sign shops, school shops, factorles, tinners, autobody and fender shops, and a host of others can now do better work and make greater profit fabricating metals by the modern instantaneous method of welding by electricity with a New World 1000-Ampere Spot Welder at only $8.75 during the summer months. Operates from any 110-volt light socket. Capable of dolng diMicult work on 16-gauge and lighter sheet metal, or on rod, strip, ete., up to 14” diameter or thickness, thls low-priced spot welder, bullt to sell for $14.75, Is just what you need In your shop. Fully guaranteed one year, it may be returned after 3-days’ trial for refund of purchase price If not satished, Send stamp for folder giving information on this and larger models; or order direct and get absolutely FREE an are welding attachment that operates from the spot welder transformer and will do all sorts of light welding, brazing, and soldering. Ship- ping weight, 50 Ibs. $1 7.50 and $27.50 These two popular electric are welders are now offered at tremendous savings. The light-socket operated ‘'Craftsman’’ Model for general repair work, manufacturing. sheet metal work, and ali medium class welding, at only. $17.50, A big 150/200-Ampere ‘‘Commerclal'’ Model bullt for heavy-duty service, operating from 220-volts A. C. current at only $27.50! New World alternating current “smooth as D. C?’ welders are reliable, easily operated, and extremely durable. Why experiment when you can now obtain these standard machines at such low prices? Order promptly and obtain absolutely free a pro- fessional type welding helmet and supply of electrodes. Send stamp for folders and particulars of New World Welding: equip- ment. (California purchasers, please add 3¢ sales tax to orders.) NEW WORLD APPLIANCE COMPANY Dept. F-2 1214 Webster Street Oakland, California WHY RENT A BOAT? MAKE YOUR OWN Even a child can build at least one of the many boats that are described in the big new 148-page book, How To Build 20 Boats. Send 50c for. your copy, now. MODERN MECHANIX PUBL. CO., GREENWICH, CONN. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers The new “1936” edition of “AUTOPOWER” with all the olein specificattons and many new ones ls now off the press. illustrated—the inslructions easy and simple, practical A. C. and D. C. generators and motors, with voltage from 2 to 1,000 welding, radio, sound, ete. tools needed to make these economical changes. wind, water, fan-belt, OF “AUTOPOWER.” AUTOPOWER, INC. volts, for power, light, Send for your copy today. The book is plainly written and Change auto seneralors into No experience nor special Generators can be driven by $500 IN PRIZES GIVEN TO TIIE READERS Price only $1 postpaid. Dent. A 412 S. Hoyne Ave., Chicago

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COULD YOU FILL-THESE THEY'RE the shoes of the man ahead of you. Any day he may be promoted. And that means a better position for you. Are you ready? Learn now—to“ sell yourself” —to express your ideas in type. Easy—if you own a New Royal Portable! TOUCH CONTROL... that’s the answer! Royal’s sensational exclusive improve- ment enables you to adapt the key-tension to your exact finger pressure. With the New Royal you actually type easier than writing by hand! SPECIAL LOW-COST PLAN. Genuine latest model New Royal Portables with Touch Control. Only a few cents a day. Act quickly. FREE! Price includes handsome carrying case; also amazing new system of speed typing quickly learned in spare time. Coupon brings complete information. Fill out—mail today! Royal Typewriter Company, Inc., Dept. MM-76 2 Park Avenue, New York City. Please give me details concerning special pur- chase plan on the New Royal Portable. Quote trade-in allowance on my Typewriter, Serial number Send for CATALOG of Motor-Driven Tools Thousands of home workshops, factories, builders, farms are z using these new compact port- able, rugged and efficient motor- driven tools. They stand the heavy grind of continuous use—yet are astonishingly low priced. Many new features and improvements. Com- plete DELTA line includes: Circular Saws, Scroll Saws, Lathes, Jointers, Shapers, Band Saws, Grinders, Drill Presses—and full line of accessories. Send today for big 48 page FREE | Catalog. „ Dept. M736, DELTA MFG. CO. 600-634 E. Vienna Ave. Milwaukee, Wis. A Home Air Conditioner [Continued from page 97] access is possible for motor adjustment. A hole is cut in the top to take the lower end of the 16-inch pipe leading down from the cold air vent originally installed in the home. To filter out dust particles from the air the filter frame is provided with cheese cloth or other suitable material not too closely meshed. This frame is built up of strap iron, the ends cut out with a hack saw or emery so they will be of the same thickness as the sides. To provide disinfecting qualities to the humidifier, the filter cloth is immersed in a solution of chlorinated lime, about 2 ounces to a gallon of water. AIR CONDITIONER BLUEPRINTS Enlarged blueprint plans fer constructing the air conditioner, printed on tough rag content blueprint paper, are available from the MM Blueprint Dept. These plans will simplify construction and insure satisfactory results. The price of the plans is 50c postpaid. Order Blueprint No. W-640. Modern Mechanix Publ. Co., Greenwich, Conn. Outfitting for the Canoe Trip [Continued from page 75] wilderness camping, it is a recommendation that the tent have a floor canvas sewed in. While blankets can be used in conjunction with the regulation air mattress, there is something to be said for a lightweight, sum- mer type of sleeping bag, kapoc filled, not eiderdown. Laid down cn a full length air mattress, the combination is as perfect as modern inventiveness has been able to con- trive. In eastern Canada, as far as the Labrador and west of Hudson Bay, the so-called pack- harness on which to lodge the various bags containing the sleeping bag, duffle bag, food bags, etc., is generally in use. In western Ontario, Minnesota, Wisconsin, Michigan and portions of eastern Ontario, Duluth pack- sacks are the standby. Without doubt the pack-harness is the most efficient, although a large size pack-sack will hold an amazing amount of material. Tump-straps, being broad leather bands that cross the forehead, are used both in carrying a pack-harness outfit and the pack- sacks as well. Pack-sacks having the regu- lation shoulder straps and tump-straps, per- mit one to carry a heavy load without exact- ing effort. Food is carried in small bags, usually of muslin. These in turn fit into waterproofed or paraffined bags. By careful protection, [Continued on page 126] 122 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Build “Handy Henry” Tractor [Continued from page 120] studs as shown. The holes are marked by first lining up the shift, then holding the frame member against the transmission and up against the under side of the frame. Don’t Batter the Ball Bearings We next take up the rear universal unit. Here a regular Dodge universal joint, bell housing and collar is employed. The stub drive shaft or worm gear is first removed from the truck differential and squared up to fit into the female end of the Dodge universal. Be careful, here, not to batter the ball bearing surface on the shaft. It should be squared up to within one-half inch of it. It might be well to have a capable blacksmith do this job and also the front drive shaft that is squared because they must be hardened to the right temperature. After this has been done re- assemble the differential. Next, measuring from the edge of the Dodge bell housing as shown, cut 14% inches back, Then cut a 14-inch piece from the rear end of the Ford truck drive shaft hous- ing filing the Dodge stub housing slightly so it will slip inside of this ring. Be sure the bell collar is in between then have this welded all around. Lining Up the Whole Assembly Using a heavy cord one may now line up the whole assembly by looping the cord over the Ford magneto plug and measuring back to the spring perches on the differential. By trying the cord first on one side and then on the other will tell whether or not it is all lined up with the center of the motor. Check this closely as it is important that the whole unit be lined up before completing the rear as- sembly. The distance between the under side of the frame and the top of the rear axle housing is 534 inches and this is blocked up by using two pieces of 2 by 6 hollowed out a quarter of an inch over the axle housing. Each wood piece, preferably oak, is then drilled and bolted to the under flange of the frame. The truck radius rods are now cut off to the desired length and to fit at the side engine hanger bolts. These holes should first be reamed out to half inch. The radius rod is first heated and then bent to fit, then the holes are marked and drilled. For plowing and heavy loads put the Dodge shift lever in low and let the Ford into high. However, you still have another lower gear if needed by shoving the Ford into low. One must use discretion here if the lug wheels are being used, for the low low exerts such a tremendous power upon the universal joints and shafts that something might snap if the load did not give. .- but it tells a grim story of DESTRUCTION? Here is a microphoto that shows a portion of the dirt and grit and small metal particles and hard carbon that find their way into every engine. These deadly abrasives were filtered out of the circulat- ing oil stream by a Purolator Oil Filter, during 8000 miles of driving .., stored away in the Puro- lator reservoir...and rendered harmless. Other- wise they would be carried to the engine’s closely fitted moving parts... to grind away at valves, and cylinder walls, and bearings. A genuine Purolator keeps the oil so clean that it even retains its color for many thousand miles, AND NOW REMEMBER THIS YOUR PUROLATOR MUST BE RESERVICED AFTER ABOUT 8000 MILES That is because its reservoir has become so full of this destructive sludge that it will hold no more. Your garage man will give you this service while you wait. Motor Improvements Inc., Newark, N.J; PUROLATOR The Oil Filter on Your Motor Car LICENSED UNDER SWEETLAND PATENTS Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 123

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INVENTORS Pages 6 and / INVENTORS Ey TO OBTAIN a naL mo) tT aie) -y- Vy PATEN SEND FOR FREE BOOK ===> i HOW TO OBTAIN A PATENT written by a Former Member of the Examining Corps (1922-24) & 5 of the U. S., Patent Office. If you SSS 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. It 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 personally han- dled only by a Registered Patent Attorney who is also a Former Member of the Exam- ining Corps of the U. S. Patent Office. AII communications will be strictly confidential. MAIL COUPON TODAY FOR FREE PATENT BOOK AND RECORD OF INVENTION FORM CARL MILLER. REGISTERED PATENT ATTORNEY FORMER MEMBER EXAMINING CORPS U. S. PATENT OFFICE KA NIE Tea jl sovsssorss teresosanosoonsesoooneosossoesoasao = 1638 Woolworth Bldg., Dept.76B, New York City ™ Miller Bullding, Dept. 766, Washington, D. ©. M MI please send me your Free Book, “How to Obtain a Patent,” a B and “Record of Snvention’* form. ' i | | | Ml KAME ooo. ceeccees ERRAI Eo a ERE m - L ADDRESS m | E POPE TITTLE LCL EL 124 Odd Instruments Win Fame [Continued from page 85] sounding boards in Mr. Sevant’s xylophone. If the kitchen cupboard holds a sufficient variety of glasses and goblets, the amateur can experiment with musical glassware which Marshall Rogers has developed to a high point of artistry, as demonstrated on a recent Amateur Hour. Sheer mechanical ingenuity comes into its own with the One-Man Bands. The problem here is to arrange a dozen instruments so they will be simultaneously available to the lips, knees, feet and hands of the lone artist who plays them all at the same time. Vincent Mundi, the Major’s original One-Man Band, solved the problem in a striking manner and may serve as a model to others whose musical talents are suitable to wholesale reproduction. More Prize Winners Announced [Continued from page 79] For this idea the judges awarded $5 to Mr. Torbert. Awards of $2 each went to Capt. M. J. Shannon, of Los Angeles, Calif., for his sug- gested glass trap for kitchen sinks; Woodrow Wood, Springfield, Ohio, for his idea of a de- vice for recording phone numbers of calls received while visiting; and R. C. Verhines, Springfield, Ill., for his novel cigarette tip suggestion. The judges also paid $1 each to John Jastrab, Jr., Binghampton, N. Y., who recom- mended an automatic blackboard eraser for classroom use; George Hodson, of Gorham, Maine, for a device to remove slack from shop machinery belts; Elizabeth Wenzel, of Van Dyne, Wis., for an indicator that would warn typists when they reached the bottom of the page. The final award went to L. Hoht- weigler, of Aurora, Ill., for his suggestion for a device which would combine a weighing device with a slicer so that pressed meats might be cut without waste. Read the following rules and send in your idea of a much needed invention: 1. In 100 words or less explain your idea for a needed invention. 2. This contest is open to everyone except employees of Modern Mechanix Publish- ing Co. You don’t have to buy a copy of the maga- zine or be a subscriber to enter. Write you name and address plainly on your entry. No entries will be returned. The editors of this magazine will be the judges. All decisions will be final. Mail your entry to Inventions Contest Editor, Modern Mechanix Publishing Co., Greenwich, Conn. Entries for this month’s contest must be mailed before July 1, 1936. aan e S Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Lighting the Way for Color Movies [Continued from page 38] the dancers in this scene would make a scraping noise during the dance ensembles. The costumes of the dancers, while colorful as are Spanish costumes, are not garish or over-colored as would have been the case in “Becky Sharp” or other earlier color pro- ductions. The colors are warm and have just enough brilliance to make them stand out from the color of the set, a problem which was solved by Robert Edmond Jones, the noted stage designer who is also the Art Director for “Dancing Pirates.” New discoveries in makeup by Max Factor, who collaborated on the technical problems and tests before the production was started, resulted in a makeup that gives a smooth texture to Steffi Duna’s and the other players’ faces, While the earlier makeup was mask- like and oily, the new Technicolor makeup is about the same color as natural skin, except for a slight blue quality, and it may be applied so thinly that the pores of the players’ skin show under the makeup, which gives a freedom of the facial muscles and permits a more facile play of expressions. Little or no rouge or lipstick is used; in fact, so thinly is applied the makeup that Stefi Duna bites her lips each time before appearing before the camera in order to increase the natural blood flow to the lips. The Technicolor camera is the result of experimentation since 1916 when Technicolor first began. While the black and white camera “shoots” only one negative at a time, the Technicolor must take three separate negatives simultaneously. Each of these negatives is a record of one of the three primaries, red-orange, blue-green, and yel- low. (See “How Movies are Colored,” Mopern Mecuanix, July, 1935.) The nega- tives are made by a prism which splits the light ray, after which it is filtered and the three negatives photographed. The prism is behind a single lens and the negatives are rolled up in three separate rolls in a large magazine. The whole camera is housed in a huge “blimp” which prevents the noise of the camera mechanism from interfering with the sound recording. A new device con- sisting of two Selsyn autosynchronous motors permits the cameraman to focus the camera from remote control; that is, in moving shots, the cameraman may be twenty or thirty feet from the camera and still keep it in focus. The complete camera unit with camera, “blimp,” and “Velocilator” (which serves instead of a tripod so the camera can be made to follow action) weighs 1,150 pounds. The new improvements in color movies make it possible to record the delicate tones of nature and successfully bring to the screen the things seen by the eye in real life. “Seldom see an I.C.S. graduate OUT OF A JOB—” “In ALL the years I have known of the International Corre- spondence Schools, I have seldom seen one of your graduates jobless,” A business executive made this statement in a recent letter commenting on the I, C. S. graduates and students in his em- ploy and expressing regrets that it is necessary to reduce his personnel, “However,” he added, “all I. C. S. graduates and students will be retained, for I realize their value in the conduct of my business.” The reason so many I, C, S. men have jobs is because they are trained men! A recent investigation into the working con- ditions of 1000 I. C. S. students revealed only 10 unemployed. You, too, can be an I. C. S. man. Mark the coupon and mail it today! It has been the most important act in the lives of thousands of men, - INTERNATIONAL CORRESPONDENCE SCHOOLS Box 2321- 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; TECHNICAL AND INDUSTRIAL COURSES D Architect O Plumbing O Architectural Draftsman O Air Conditioning O Building Estimating O Steam Engineer CG Contractor and Builder O Steam Electric Engineer O Structural Draftsman D Marine Engineer O Structural Engineer O Civil Engineer O Electrical Engincer O Highway Engineer O Electric Lighting D Bridge Engineer D Welding, Electric and Gas D Bridge and Building Foreman O Reading Shop Blueprints D Surveying end Mappiug O Telegraph Engincer O Refrigcration O Telephone Work O Radio OR. R. Locomotives O Air Brakes D Mechanical Engineer OR. R. Section Foreman © Mechanical Draftsman D R. R. Signalmen O Machinist D Toolmaker O Chemistry D Patternmaker O Boilermaker O Coal Mining D Sheet Metal Worker O Navigation D Heat Treatment of Metala O Cotton Manufacturing D Management of Inventions D Woolen Manufacturing O Diesel Lngines O Agriculture D Aviation Engines O Fruit Growing O Automobile Mechanio O Poultry Farming BUSINESS TRAINING COURSES O Business Management O Business Correspondence D Office Management D Lettering Show Cards D Signs O Industrial Management O Stenography and Typing O Traffic Management D Civil Service O Mail Carrier O Accountancy and _C.P.A. O Reilway Mail Clerk Coaching O Bookkeeping O Grade School Subjects D Secretarial Work O High School Subjecta O Cost Accountant O College Preparatory D Salesmanship O Advertising D First Year College D Heating D Pharmacy Oo Service Station Salesmanship O Illustrating O Spanish O Wallpaper Decorating O Cartooning O French Salesmanship Š O Lumber Dealer Name Present POUT i ssassvnieassssvsions inaa a ra EEE isi ipoetars A S If you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada Thank You for Mentiontug Modern Mechanix Hobbics and Inventions When Writing to Advertisers 125

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Mil desire to contact ilwaukee Manufacturers camest “men to 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. * A re Weld I ng portunities for steady income and 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, ete. 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? MA MILWAU K E Ete? GCHAAL of ENGINEERING Gustitute of Electrotechnics MM7-A Broadway and E. State, Milwaukee, Wis. ee oe mees TS p m a Without obligation send Free Booklet, ‘The Dawn of a Gigantic Industry and its Outstanding Opportunities.” Name ..... presents one of the outstanding op- sesceses srerisssanessesis se eew ees ÅBO srossasosese Address $1995 Now buysa genuine MEAD Bicycle : RANGERS cost a few dollars more. Do not buy until vA ; you get our nator anne new prices and torma ə ship on ape 30 Days’ Trial poa? ir aot satisfied after trial return the bicycle at our expense. lamps, wheels, equipment at half usual prices, $ Tires Write’ for marvelous zew prices and terma, Es Mea CYCLE COMPANY write ue Y today for DEPT. F205. CHICAGO tree cataros $ INVENTIONS Concentrate your talents on inventions that will pa BIG MONEY. 1936 Edition of 1500 NEEDED ~ INVENTIONS by R, F. Yates tells what Inven- tions manufacturers NEED badly. Describes In detail 1500 Needed Inventions in these fields: General Problems; Automotive; Electrical; chanical; Chemical: Aviation; Radio; Marine. \lso chapters on the Ten Most Needed Inventions, and on new scien- cific discoveries important. to inventors. Simple, practical ideas—one idea from this bi in you a fortune. If you want to invent, ay you the most money. This book tells Keeps you from we ng on inventions nobody wants to buy. arge cloth bound book, $ pages, nine big chapters. Only $2.50. Drop a postal and we will send 1500 NEEDED INVENTIONS C.O.D. We pay postage if you send cash with order. If not delighted after 5 days' examination, return it and get your money back. INVENTORS’ SELLING GUIDE How and where to sell patented or unpatented Inven- tions. Inventors’ Selling Guide by R. Yates, noted authority on inventions, gives classified list of nearly 1000 manufacturers who buy ideas. Tells how to sell unpatented inventions safely, how to sell chain stores, how to price inventions, seiling by correspondence and demonstration, how to find Duy- ers, ele. = Tells what an inventor must know about Law, Royalty, Contracts, Patents Pending, Financing. Gyp Schemes, Selling Methods. Cloth hound book. 224 pages, 15 chapters, postpaid. $2 (or C.0.D. Plus postage.) Satisfaction guaranteed. BOTH BOOKS FOR $4.00 lf ordered at one time Wrile for FREE specimen pages and complete catalog of valuable books for inventors. DONLEY PUBL. CO., 509 Filth Av., Dept. M-7, New York,N.Y. 126 Also: Take Out Your Own Patents, $1.00 Making Unpat- ented Inventions Pay, 50c A Novel Sword and Shield Sundial [Continued from page 107] metal cutting blade. Before laying out the shield it is necessary to first know the latitude of your location. This is easily found by referring to a map and locating your town with respect to the parallel of latitude given at the right or left of the map. Let us assume that this is found to be 42 degrees. Subtracting this from 90 degrees you have the complement of this angle or 48 degrees. On the shield draw a line across the top of the hole for the sword. This is the VI—VI line in Fig. 2. Now draw a line from the point of the shield to this hole. These lines are at right angles to each other. Refer to the chart shown in Fig. 2-C and on this locate 48 degrees on the quadrant lines. Now place a straight edge at the center of the shield, intersection of VI-VI and VII o’clock line, and draw a line from this point to the point where the 48 degree line intersects the curved lines. In Fig. 2 the dotted lines stop at this point. Now continue this line to the pro- tractor scale and read the number of degrees. Now using a protractor on the shield at the intersection of the VI-VI and XII o'clock mee mark out the angle as obtained from the scale. Outfitting for the Canoe Trip [Continued from page 122] dampness and water will thus have no effect on your store of food. All seasoned trippers are of the opinion that you cannot protect your food too well. A list of food supplies and other essentials connected with the cooking end of the camp- ing pastime, involving two persons for a space of time extending over ten days lists about as follows: Two 1-pound cans of vege- table shortening; 8 pounds of bacon; 4 pounds of flour; 5 pounds of sugar; 2 pounds of rice; 3 pounds of navy beans; 1 pound of salt pork; 2 pounds of coffee; 8 loaves of bread; 1 can of powdered eggs (which equals 4 dozen fresh eggs); 1 peck of potatoes; 2 pounds of salt; 1 can of pepper; 4 pounds of dried fruit; 1 box of matches; 3 pounds of onions; 1 can of kitchen cleanser; 3 yards of toweling; 2 plumber’s candles, two-inch size;; 2 pounds of butter; Y% pound of baking soda; and 1 bar of laundry soap. The above are essentials, those items, in fact, that can hardly be left out. Following are some additions that are not out of place: 2 pounds of brown sugar; 1 package of hard- tack; 1⁄4 pound of tea; 6 cakes of sweet choco- late; 2 pounds of oatmeal; 1 pound of raisins; 2 packages of spaghetti; 4 pounds of ham; 2 pounds of corn meal; 2 pounds of cheese; and 2 pounds of split-peas. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Detective Smashes Police Ring [Continued from page 53] under desks, in desk lights, under chairs in which certain officials sat. The method of listening to conversations and taking them down in shorthand soon proved cumbersome and slow. To be of any use later as evidence, the shorthand notes had to be transcribed, and this in itself was a herculean task. So Jamie went on a hunt for a short cut. He found what he wanted in the pamo- graph, later to be known as the “mechanical stool-pigeon.” This machine, built like a portable phonograph, recorded conversations on an aluminum disk, cutting them deep into the metal with a sapphire needle. The tapped telephone lines and the dictaphones were rigged so that they could be switched to the pamograph in a moment’s notice. Jamie naturally was acquainted with sig- nal devices of all kinds used in public safety work and now he turned his attention to the apparatus used in fire department offices to punch out on continuous tapes the record of fire alarms sent in from alarm boxes, Ticker Tape Records Telephone Numbers He set to work to fit one of these recorders to watch through the silent hours of the night in his office. Should a police official, to take a number not used in St. Paul, call Duncan 3224, the record on the tape the following morning would show 3-8-3-2-2-4. The regularity with which certain numbers were called led to undercover operations which served only to fashion more firmly the case Jamie was building up. Janitor Tips Off Jamie’s Plot The tip-off came one day when a janitor was repairing a ventilating shaft leading to the office of a high police official. In the shaft was found one of Jamie’s high-powered dic- taphones and the officials realized instantly what had been going on. But Jamie had been in operation for four months and had secured more than 400 disks of incriminating conver- sations. These were placed in the hands of the mayor, the city attorney and the county attorney, and immediately three detectives and a patrolman were dismissed and a num- ber of other officers, including the chief of pclice, were suspended. Jamie now came to his rewara. In tne resultant shakeup in the police department, he found himself made assistant commis- sioner, a post next to that held by Warren. Later he was invited to join the force of a large private detective firm in New York City at such a salary that he could not possibly turn it down. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers “Experience is a great teacher— but you can learn more from books, quicker and cheaper.” _A man can go just so far in machine shop work with only his every-day experience to aid him. The men who get ahead are those who equip themselves with knowledge—who prepare to take advantage of the breaks. Many have done so with these practical books; you can too. American Machinists’ Library 6 volumes—2,000 pages—2,500 Illustrations (A combined home-study course and reference UJbrary) MACHINE MACHINE FOOLS Pus m e STANLEY’ 5 CAN] STANLEY STANIEK This Machinists’ Home-Study Course helps men get ahead _ This library of machine shop practice was written for prac- tical men. It gives you expert information on every point of your work. It fully explains tool and gage work, machine tool operation, jigs and fixtures, punches and dies, the work- ing of steel, operating lathes, drills, hand and automatic screw machines, planers, boring machines, milling machines and many other facts which you need every day. Plainly written —completely illustrated—the best kind of help to the machine- shop man who wants to advance himself. Solves Your Problems No matter what the problem is that puzzles you, if it is anything to do with a machine shop you will find it answered in these books. Whether you are a tool maker, a die maker, a draftsman, or handling any job there is in a machine shop, this Library contains the practical information you need. The text is written in language intended for the practical 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 ON Special Low Price Bought singly these books would cost you $20.50, In this Library they cost only $17.50, a savings of $3.00. In addition, you have the privilege of ex- amining them 10 days without sending a cent in advance, and, if you decide to keep them, of paying in easy monthly installments, while you use the books, Look over this helpful Library—Send the free examination coupon now. 10 Days FREE TRIAL Just Mail PPV BBA BQBBeweBUeEBVeVVSVUEBeeeeBBe Be ‘FREE EXAMINATION COUPON, f McGRAW-HILL BOOK CO., Inc., 330 W, 42nd St, New York. g Send me for 10 days’ free examination the AMERICAN g f MACHINISTS’ LIBRARY. If I keep it I will send you $1.50 í gat the end of 10 days and $2.00 monthly until the Special Price of $17.50 has been paid. If not wanted I will return the books § g Postpaid. , s p Signed ......00.. Oem emma enon eee sodrai osp osrenss psina cael s GAUGES spouneususesecsceces EEEE EEA A g Clty and State.....cccseescessseceees terseereeeseeneesserecee g 4 Position ames oeesaceneas seseoseseu sersryesepsass EEEN 4 d 4 p COMPANY 2... scene nee seen ee ee nne cea eeenne MAMs-7-36 g Wee eewewaweeawaewaewesawenuenuarn 127

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FACTORY TO YOU LATEST MODEL REMINGTON TYPEWRITERS ; SRAND NEW, atent : model Remington Port- ableforonly 10¢ a day! Amazingly low price direct from the factory. Every essential feature of large office type- writers—standard 4-row keyboard, standard width car- riage, margin release, back space, automatic ribbon re- verse. Actnow, while this special opportunity holds good. You don’t RISK a Penny ‘Wesend you this genuine Model 5 for 10 days’ free trial. Tfnotsatisfied, send it back. We pay all shipping charges. FREE Typing Course and Carrying Case You will receive FREE a complete simnnied home coure in Touch Typing. Ca ERED, : handsome, sturdy carrying case. No obligation. i full detaile—NOW. eee is cine EEE Oe Ses ee ee ee ee ee ee ee ees ee Remington Rand Inc., Dept. 141-7 205 East 42nd Street, New York, N. Y. Tell me, without obligation, how I can get a New Remington Portable, plus Free Typing Course and Carrying C $ 10¢a day. Send Catalogue” RE y Profits ASSEMBLE YOUR OWN KAYAK--./75 Easy. No experience f required. 16 new models, 10 to 20 feet—1 to 4 per- sons. Safe, light, non- sinkable, Best materials and construction. Ideal for Campers, Sportsmen & Fishing. Complete cut-to-fit assembling kits. Money Back uarantee, sk for agent’s LA ine te self- application blank. Oldest Kayak Builders in America, KAYAK BOAT CO., Dept. M, 147 East 84 St., N.Y.C. SEND 10 CTS, POST- AGE TODAY for com- BUILD AN AUTO RADIO Send 50c for blueprints to Modern Mechanix Publishing Co. Fawcett Building, Greenwich, Conn, EVINRUDE 5PORTSMAN oe WITH l “HOODED POWER” $ ONLY... Enjoy water motoring, fishing, rec- reation at lowcost with America's most popular outboard motor. Weighs only 24% lbs; runs 3 i hours on one gallon of fuel; starts * quickly, runs quietly, smoothly, depend- ably. Many advanced features. Hand- somely illustrated catalog de- g scribes eight Evinrude models, shows every type of outboard boat. Free. EVINRUDE, 4817 N. 27th St., Milwaukee 128 | Splitting Waves With Outboards [Continued from page 70] steering and its backward flow has the effect of counteracting the forward drive of your propeller. Even the V-shaped stretch of water between the two diverging lines of another boat’s wake, while it is smoother, still has enough backward motion to cause a no- ticeable reduction in speed in the trailing boat. If the leaders are so spread out over the course as to make it impossible to find smooth water, a boat may be jockeyed onto the down-hill side of the waves set in motion by one of the leading boats and gain speed from its forward sweeping motion. Smooth Hull Important To Speed It is important, too, that a boat be abso- lutely waterproof and thoroughly dry inside before a race. It is surprising how much a little water in the bottom of a boat will weigh, and how much it will do to retard speed. The hull should be kept smooth and well caulked. If the finish is rough or chipped, it should be removed, the hull sanded, and fresh paint and spar varnish applied. A boat will plane better and develop greater speed, too, if a thin coat of graphite is spread over the bottom just before a race. Because of the power and speed these modern motors can develop, there is no longer much need for drivers to spend hours “souping up” or rebuilding them as they did a few years ago. However, it is important that they be kept tuned up and there are several ways in which their efficiency may be increased. Pistons should be balanced in scales and if any difference in weight is found they may be filed down until they balance perfectly. The crank shaft, too, may be ground down to a perfect balance. Remove Muffler To Reduce Back Pressure All gas passages, including the venturia tube, should be polished and filed to remove all irregularities or burrs in the castings so as to increase the free passage of fuel. Check piston rings and adjust all bearings so there is only enough play to allow for expansion when the motor heats up. Compression may be increased by removing the head and filing it down to reduce the space in the firing chamber. The muffler should be removed to reduce back pressure, although the use of cutboard motors without mufflers is pro- hibited in many places, except when they are in actual competition. The majority of racers now use fuels which are blended and sold commercially, a few still use a solution of 75 per cent wood alcohol and 25 per cent benzol to every gallon of which is added 1% pints of castor oil, as the fuel and lubricant are used together. Thank You for Mentioning Modern Mechanix Hobbics and Inventions When Writing to Advertisers

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Nation Sits In National Conventions [Continued from page 29] paratus, while another microphone will amplify the speech so it may be heard in the farthest corner of the hall. So far there is nothing unusual about the procedure. But there are a thousand delegates seated on the floor of the hall, each of whom has the right to speak when he has been recog- nized by the chairman. Actually, each state delegation has a spokesman, who is author- ized to speak for all. Pages Will Carry Microphones Owing to the size of the meeting, it would unnecessarily delay the business of the Con- vention if every delegate desiring to be heard had to mount the speaker’s platform. To. obviate this there will be ten microphones suspended from the ceiling, each mike in charge of a page boy. When the chairman recognizes a speaker on the floor, the nearest boy will bring him a microphone, into which -he may speak, while the switchboard opera- tor plugs in that mike to the loud speakers, radio and newsreels. It will be futile for anyone to attempt to shout down a speaker, once he has the exclusive use of all sound facilities. Howard Leland Smith, the architect for the Democratic Convention, has designed a way of taking care of newspapermen that will do away with the complaint that the most favored pressmen had the worst seats. Press boxes at such affairs have usually resembled two huge sections of grandstand, sloping downward toward the center, so that the representatives of the big press associations and largest papers have been directly under the speaker’s stand, unable to see, and often to hear, what is going on. Smith has re- versed this arrangement, elevating the center of the press box, and sloping it down- ward toward the ends, thus enabling all to see and hear. This press box has been placed over the orchestra pit, with press rooms di- rectly beneath. Newsreels Will Be Active Three platforms have been erected for use of the newsreel cameramen. One, a double deck affair, will be at the edge of the stage, so the camera may catch a profile view of the speaker, or may be turned outward to take in the Auditorium floor. Two other platforms will be erected 120 feet from the speakers platform, at either side of the hall. The cameramen here will use telescopic lenses. Accredited newspaper photographers taking stills will be permitted the run of the audi- torium, mainly because those in charge realize the futility of trying to confine their activities tc one spot. MY NEW JOB,TOM,IS A DANDY, MORE FUN, EASIER WORK AND BIGGER PAY NOW gr WORKING ASA f| CAN | R? DRAFTSMAN. > | WANT TO LEARN DRAFTING SS WELL , TOM, YOU'LL HAVE TO PUT IN ONE OR TWO NIGHTS A WEEK STUDYING AND WORKING 2m WITH DRAFTING TOOLS. I'LL. WRITE ENGINEER DOBE TODAY FOR HIS Prepare, for Better , are ready and more expected soon in auto Pe work, aviation, electricity, machinery and certain building lines FOR THOSE WHO LEARN DRAFTING NOW! It's the wayfor a quickstart to a better pay- ing, much bigger job, Send at once for Engineer Dobe’s Get out of ovar- : alis now! : Boom in in- 5 dustry and build- ` S ing now seems well under way. Operating Draftsmen, who draw plans, are Successfully, ” needed first. Trained draftsmen will be Since : indemand at better pay, shorter hours. Pre- 1900 =, pare now! Engineer Dobe will teach you at ome in surprisingly few months at little cost. Practical method successful with thousands. High school education or previous experience not needed. Everything made plain on practical work. Engineer 7 Dobetrains his students until in a satisfactory posi- tion—or money back, Send for FREE Book NOW while this offer lasts, F i ALL TOOLS FURNISHED A valuableset of tools & —sent at once (also a drawing table), without extra cost if you enroll now. Mail coupon today. DRAFTING = FROM AN ENGINEER : j= MAIL THIS COUPON...» | ENGINEER DOBE, Div. B473, Libertyville, III, i Engineer Dobe’s School I Send me your free book, “Successful Draftsman- § I ship” and explain how you assist your graduates 1 J to good positions as draftsmen. I I | ARES 77 E T E erates ree N OECTA Pen | l I | A ORES ede re cece pasate tect aati I l l Towns seire State. ne r Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 129

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ATAZAN ACCORDION @ If. you want to be really popular, have all the fun, the centér of at- traction everywhere, just learn to play this thrilling insiru- ment from lialy A complete band or orchestra in itself, and so easy to learn to play You'll master this easier Soprani in no time, and you'll, have real fun from the slart. Don’t delay Big future. Send postal for beautifully illustrated literature, No obligation Easy terms. Write today sure, dl ° SOPRANI, INC., 630 S. WABASH AVE. DEPT. 734 CHICAGO, ILL. ELES NERAL A BROAD, basic intensive course complete in one school year. Includes fundamentals of Refrigeration, Air-conditioning, Electronics. Approved by educa- tors, endorsed by industry. 44th year. Catalog. ELECTRICAL Wy BLISS "Esra 297 Takoma Ave., Washington, D. C. SPECIAL SALE “100 SHOT” REPEATER Latest Model 1936 Haenel repeating pistol. Sturdy, massive construction. 100 shot magazine. Shoots B. B. steel shot. FREE—300 Shots. BENJAMIN AIR $6: 95 82. on deposit PISTOL .177 or .22 cal. — on C. 0. D. FREE—Folder on ba Pirols etc. Earn $1850 to $3000 a Year Excellent opportunities for citizens 18 to 50. No special experience needed. Railway Postal Clerks may earn $155 first month; Customs Inspectors as high as $3000 a year. Send for my FREE BOOK ‘ ‘How to Secure a Government Position.’’ It tells about many good govern- ment jobs and how I help to qualify you for the one you want. | Wrile At ONCE. Address Arthur R. Patterson, PATTERSON SCHOOL, 437 Case Bldg., Rochester, N. Y. means a new pr ‘ofession, a new trade for countless thou- sands of men. Learn Diesel operation, construction and repair NOW. Use this new, complete quick reference Look. Air and sold quel injection systems explained. ND NO MONEY Send name and acaress and we will ship this new book ‘‘Diese] Engines’? immediately. Pay the post- man only $2. 50. plus a few cents postage upon delivery and if you are not more than satisfied, if you_don't believe this subject can pave the way L. for bigger pay, send it back and every penny you wI have pald us will be returned to you. If you prefer you may send only $2.50 and the book will be sent prepaid with the same money-back guarantee. AMERICAN TECHNICAL SOCIETY, Drexel at 58th St. Dept. OB-320 Chicago, Ill. Splendid opportunities. Prepare quickly in spare time. No previous experience necessary, common school education Many earn while earning. Send for free booklet ‘‘Opportu Modern Photography” 1 Particulars and requirements. RICAN SCHOOL OF PHOTOGRAPHY 3601 Michigan Avenue Dept. 205B, Chicago, Hlinois 130 Paint Wisely and Save Money [Continued from page 111] curely adhering edges, HAVE THE OLD PAINT REMOVED COMPLETELY for a really first-class job. In repainting over this old coating, use a hard type of paint, preferably the same as was used previously. Use a real oil paint which contains no heat-treated oils or var- nishes that tend to give enamel-like con- sistency to a paint. A real oil paint properly mixed will show brush marks, but it will fill the flaked patches better and more nearly conceal them than a paint containing oils treated to give quick drying or freedom from brush marks. Moisture Under Paint One of the most frequent and costly causes of premature failure of paint is moisture getting behind painted woodwork. The con- ditions are greatly aggravated when the tem- perature on the unpainted side is materially higher than that on the painted side, as is the case on the outside walls of heated build- ings during cold weather. Under such con- ditions good paint may fail within a few months, leaving a surface that is unusually expensive to repaint properly. Blisters are unmistakable signs of moisture in the side walls. If you must be convinced that there is moisture behind the boards, allow a carpenter to remove a board of siding, which he can replace without damage. Blistering is found most often in late winter or early spring. Later in the season the side walls may dry out again and the blistered parts of the coating become flabby or even sink back to almost their original position. Blisters may break and peel soon after they form, but often they merely dry out and shrink back. When the coating becomes more brittle as a result of weathering for a few months longer the blistered areas crack open and scale off. Some Homes Are “Chronic Peelers” If your home is a “chronic peeler,” it is useless to repaint it, even if the old coating is entirely removed, until proper steps have been taken to keep moisture from getting be- hind the painted boards. There is no way in which houses can be kept properly painted at reasonable cost until construction practices afford dry side walls at all times. Care must be exercised that in new buildings the plaster is properly dried, that no rain water can seep through leaky joints left by poor carpenter work or faulty design which leaves inade- quate flashing around’ windows, chimneys, dormers, eave troughs. Stingy application of paint and too much thinning of priming coats often cause diffi- culty in paint jobs on new wood surfaces. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Hidden Hazards of Circus Thrillers [Continued from page 51] One of these is Edward Van Wyck, of Cin- cinnati, Ohio. He has a small mechanical work shop in Cincinnati and in this little fac- tory rigging for such circus stars as the Cris- tiani Troup, Con Colleano, Mrs. Tom Mix, formerly one of the flying Wards, Ira Millette, Joe Cook, Martin & Martin and hundreds of others, is made. He makes apparatus from ideas suggested by performers. If a performer has an idea for a certain piece of mechanical equipment for his or her act, they go to Mr. Van Wyck who works out and perfects the apparatus. Mr. Van Wyck, who was at one time a pro- fessional juggler, has been making circus and juggling equipment for some thirty years. Good Apparatus Necessary Good mechanical apparatus, and particu- larly individual creations, are very necessary to the circus performers’ success. A bounding wire performer must have accuracy and the exact proper elasticism in the huge springs that create the rebounding power in his wire. Clowns have created their biggest laugh hits with the use of mechanical devices of various kinds from the funny fliver to the hatchet in the head. The hatchet in the head stunt is done by placing a piece of wood beneath the clown’s wig. The hatchet is made from wood also and couple of small, sharp nails pro- truding from the blade of the hatchet does the trick. When one clown bangs the hatchet down upon the top of another clown’s head, under whose wig there is wood arrangement, the weapon sticks, and looks as though the blade was buried in the poor jester’s skull. The Human Cannonball Act, in which the two men are shot from a huge cannon, is strictly a mechanical perfected and executed act. The act is done by Hugo and Victor Zacchini. They are both shot out of the cannon at the same time, with Hugo coming out a few seconds ahead of his brother Victor. They land in a net some 100 feet from the cannon. The entire apparatus they use cost $40,000. Use Compressed Air In Cannon What really shoots them out of the cannon is not a force created by huge springs. Some cannon acts have used the spring mechanism but the Zacchini Brothers use costlier com- pressed air. By carefully gauging the air pressure, they know to the inch where they will land. Springs, subject to weather con- ditions, are temperamental, and have rocketed several men to their death. The real working details of the Zacchini Brothers big gun are known only to them. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Course at Home. Many Finish in 2 Years You can complete this simplified High School , Course as rapidly as your time and abilities permit. Equivalent to resident school work —prepares you for entrance to college. Stand- ard H. S. texts supplied—Diploma. Credit for H. S. subjects already completed. Single sub- jectsifdesired. High Schooleducation is very important for advancement in business and industry and socially. College Entrance During the past 14 years, our High School graduates have been admitted to 531 different Universities, Colleges, Junior Colleges and Normal Schools—80% of them without entrance examination, Course also prepares for teachers’ certificate and pre-professional examinations. Business—Industry To get and hold a good position in Business today you must be able to write clear, accurate letters and re- ports—do figuring involving Algebra and Geometry— talk intelligently on matters requiring a knowledge of Geography, History, and Economics. In Industry—Mechanical and Engineering lines— you must have at least an elementary knowledge of Physics and Chemistry—be able to figure quickly and accurately—know something of Mechanical Drawing and blueprints—and be able to talk and write ac- curately and clearly on both your work and ordinary topics of conversation. Our High School course meets the preparatory edu- cational requirements for Business and Industry. An Educational Institution The American School was chartered in 1897 as an educational institution, not for profit—and is exempt from paying Federal income tax, like the best resident colleges and universities. Don’t Be Handicapped — Complete Your Training Now Be a High School Graduate! Prepare yourself for promo- tion in Businessand Indus- 20 Other Courses try—for the Professions, College Entrance and so- cial success. No matter Over 150 noted Educators, En- gineers, and Business Men helped prepare our special in- struction material, which is used by many resident schools and colleges, U.S, Navy, and Province of Manitoba, Canada, We offer you quality training what line you may select, High School training will prove invaluable to you! Our moderate fees cover all instruction, standard textbooks and Diploma. at home for the best - paying lines of Industry and Business, as listed in the coupon. Easy monthly terms. Get ahead in life. Start your training NOW! Mail coupon for information about line that interests you American School, Drexel at 58th, Chicago AmericanSchool, Dept. HB-28, Drexel at 58th, Chicago Tell me how to train for success in line checked. No obligation. (High School Course O Accounting & Auditing (Diesel Engineering DArchitecture & Biding ODrafting & Design O Automotive Engin’ ring Liberal Arts O Business Management Private Secretary O Comercial Aeronautics Hi'er Ac’t'g(C.P.A.) D Electrical Engineering Highway Engin’r'é D Electrical Refrigerat'n [Mechanical Eng’r'g DAir Conditioning ORadio & Television O Civil Engineering O Salesmanship O Complete Law O Steam Engineering ooo 131

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GAS ENGINES For Model Airplanes—Boats e G. H. Q. “Loutrel” Motor is most spec- tachi achlevement In model airplane history— in “0003. denser, tank, i connecting rod, screws, nuts, lts, pati is fully machined and ane gas, batteries or propeller ineltaéas Postpaid for only $8.50. Re y-to-Run G. H. “Loutre” Motor complete i with propeller block In- eluded; entirely assembled Perae “Shinment=Performar pefo ipmen: ‘erformunce guaranteed—1/5 horsepower at „0CO to 7,000 REAL, il or batteries included. Postpaid for’ onl; $12.50, Y Hlustrated catalog including information on gas accessories and par G. H. Q. MODEL AIRPLANE ‘CO. 564-A Southern Boulevard New York, N, Y. ime: er, erank: Cards, stationery, advertising, labels, paper, circulars, tags, ete. Save money and time. Sold direct from fuctory only, Junior Press, $5.90, Job Press, $11, Power, $149. Do popular raised printing like en- graving with any of our presses. Print for Others, Big Profits Pays for ltself in a short time. Easy rules sent. Write for free , catalog of outfits and all details. j) The Kelsey Co., K9, Meriden, Conn Build Your Own Electric Outboard Motor from old auto generator. We show you haw. Make money building for others, Variable Speed, Light weight and Silent. Operates from 8 to 12 hours on ordinary storage battery. 25 cents brings complete simplified plans a and catalog. r LEJAY MFG., (514 W. Lake, Minneapolis, Minn. = Bulld furniture, toys, novelties in your spare time. Make extra money. || Tools are casy to operate. You can cats a workshop for as little as Write Dept. MM7 for free 40-page Catalog SS Walker-Turner Co., Inc., Plainfield, N. J. AMERICAS Finest- f ROYCRAFT COACHES. Breath-taking beauty, amazing comforts, h: 4 pointments and precision craftsmanahip make" Royerat i Coaches America’s most Luxurious trallers! Ten Moedels—$450 to $3,600! Free Catalog! ROYCRAFT COACH CO. 437 Main St., mca Mich, For..BIG Money- Making. „Doing ALL Work Use Je ESFEL-GEARED > PUERENCH KIT @ 2 New Pocket Machine @ACTTODAY, „and Shops». 7” and 81⁄2” get also Free... “the @ It Takes 7 SQ. FT. OF ‘SPACE and 101 Pictures to show the astound- ing Working Power, Speed and Effi- ciency, and the AMAZING MONEY- MAKING Power..$35 to $100 Weekly.. of ie Greatest Hand Tool Invention of ALLTime . .so Don’t expect us totell the slory Here: but... let us send you the MOST AMAZING Propositions, FREE! so They will Please and Astound you! P Mail this Part of of Ad TODAY with your m address Ton "A Postcard will 1 l do). Get FREE~101-Picture Manual of Mechanies, with .. (Q) User Offers. Or, Wilh: CO DISTRIBUTOR, Territory and FREE KIT Offers. l 1_ AMERICAN PLIERENCH CORP'N MMS -4809 N, Ashiand Avo., CHICAGO, ILL. | 132 "ea alalog Sworld’ s Most Useful Aly tool.” Ithas.. 2 End, 2 Side and 3 Angle gesSss turos F R E E Serews in D All Posi- tions:. $1 worth E of Uses. Cartoons Gain Third Dimension [Continued from page 59] part of the secret of the process. Between the camera and the set is a frame on which the celluloids with their drawings are mounted. The camera photographs through the celluloid and includes the back- ground, so that the characters seem to be walking on the set. Between the lens and the celluloid, cut-outs of trees or other objects can be mounted. Thus the completed film presents a single picture of objects actually photographed in three vertical planes. This alone, however, is not enough to give the illusion. Ordinary camera lenses are set for infinity, which is an imaginary point as many miles distant as vision may reach. Mr. Fleischer’s cameras, however, have the lenses set for an infinity of six feet, which is the imaginary vanishing point of the set on the revolving table—the pivot around which the set moves. When the table revolves, the portion of the set which is closest to the camera seem to be moving more rapidly than sections nearer the pivot. The human eye is accustomed to viewing things in its own manner, so when a film made by this process is projected, the spectator unconsciously reconciles the false vanishing point with his perspective. Win A Soapbox Racing Car! [Continued from page 57] ment, ball bearing, true tracking, and free of friction to such an extent it can be set rolling by blowing the breath upon it. The rest of this novel assembly is covered in the drawing. The doenut wheels can be fitted by merely bolting one end of the ball bearing axle to the U. The best frame is by all odds the 156”x154” fir longeron idea, with plywood bulkheads, plywood floor, and galvanized iron hood, all screwed into one boat like box and mounted on the coil springs over the axles. This gives a body which is made rigid because of its covering. It is stout, and comfortable, being of the hammock type. The drum and cable method of steering, because the size of the drum can be adjusted to give fast or slow turning action, is the best. It can be easily adjusted, and if you use pulleys with stranded cable, or wire rope, you have a strong method of steering that is geared to the proper leverage and speed. A college education. A trip to Europe. These and other valuable prizes are to be given by the Chevrolet Motor Company in conjunction with your local newspaper for the winner of the great American Soap Box Derby for 1936. Start your preparations by entering MM’s Soapbox Word Contest. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Brig. Gen. Arnold Surveys Flying [Continued from page 61] steel rails or tarviated highways, yet it is almost as definite as if it were. Along this route are emergency landing fields built by employes of the Department of Commerce; beacons stand at regular intervals, the distance depending upon the character of the terrain, to light the way by night. At all the larger cities along the course will be found other landing terminals as complete and ex- tensive as the airport of departure. As the plane flashes along the course the pilot will “check-in” at frequent intervals by radio voice with men who sit, day and night, beside the radio switchboard to keep track of planes in transit. Airplane Manufacture Comes First Now we shall consider in greater detail the primary ramifications of the new busi- ness, always with the end in view of showing the proportions of each, the numbers em- ployed, and the degrees of skill required. First, the manufacture of aircraft. There was a time when airplanes were built in sheds, in blacksmith shops or even in the open, That was long before they assumed their present sizes and proportions. Today, ten principal factories in the country build 90 per cent of the naticn’s aircraft. They are built in tremendous establishments, covering thousands of feet in floor space. Engineering Field Is Highly Specialized Aside from the business executives, some of whom have grown up with the industry and others of whom have been in banking, law, and other professions, the principal pro- fession represented is engineering. These engineers are men with college training, fol- lowed, generally, by practical experience in the drafting or design rooms of aircraft manu- facturing plants. In recognition of the present requirements for aeronautic engi- neers many of the larger universities have installed special aeronautic courses. The department, section or shop foremen are also men especially trained and educated, and they draw good salaries. Under them come the artisans, the men who work with their hands. There will be found carpenters, blacksmiths, tinsmiths, tool makers, die makers, instrument repairmen, and general mechanics. Such plants employ a large num- ber of common laborers, clerks, typists, and general utility men and women. At its peace-time peak several of the large plane and engine factories employ more than two thousand people in a single plant unit. In addition to plants and factories devoted entirely to airplane manufacture, many affil- [Continued on page 134] Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers "GIVE ME YOUR MEASURE AND ILL PROVE IN THE FIRST 7 DAYS YOU CAN HAVE A BODY | LIKE MINE! No other Physical In- structor in the World has ever DARED make such an offer! LL give you PROOF in 7 days that I can turn you, too, into a man of might and muscle. Right in the first week you will see and feel the im- provements! Then I continue to re- build, renew and “overhaul” your body. Soon you are the proud owner of a powerful build like mine. People will notice the ruddy glow of health in your face. the sparkle in your clear eyes. the breadth of your shoulders. You will be the fellow who will walk oif with the prettiest girl and the best job. Mail coupon below for a FREE copy of my new hook. It reveals the secrets that changed me from a 97-pound weakling into a husky who won the Actual title of “The World's Most Perfectly photo Developed Man.” how! Are you underweight? TII add showing pounds where needed! Are vou fat in how spots? T'I! pare you down to fighting CHARLES trim! And T'I] also give you rugged health ATLAS that banishes constipation, pimples, looks skin blotches and similar conditions TODAY that rob you of the good things of life! i I haven’t any need for contraptions that may strain your heart and other vital organs. T don't dose you or doctor you. Dynamic- Tension is all Í need. It’s the natural, tested method for developing real men inside and out. 48-Page Book FREE Tells all about my method and what it has done to make big-muscled men out of run- down specimens. Shows, from actual photos, how I develop my pupils to my own perfectly balanced proportions. My system can do the same for you too, Don’t Keep on being only half of the man you CAN be! Put your name and address on the coupon, or a posteard, and mail it today. CHARLES ATLAS, Dept. -G, 115 East 28rd Street, New York, N. Y. measurements Flee eral lalla a n ce Nae Nene a E a Ben Nese Nan Herel led may be Bn equal CHARLES ATLAS, Dept. 6-G_ |enance to „YIR 115 East 23rd Street, New York, N. Y. | YOUR, name en- graved on it! Big Sliver Cup Being Given Away This. valuable solld sterling sil- ver cup, stands about 14 inches high. I will award it to my pupll who makes the most Improve- ment within the next 3 months. Therefore, no matter what your I want the proof that your system of Dynamic- J sseseeeee! Tension will make a new man of me—slve me a healthy, husky body and big muscle development. free book, “Everlasting Health and Strength.” Send me your © 1936 C. A. Ltd. 133

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Law! LEARN AT HOME Are you adult, alert, ambitious, willing to study? Investigate LAW! We guide you step by step— furnish all texts, including 14-volume Law Libra- ry. 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. 7493-L, Chicago Charles Magnante, famed Radio Accordionist, reveals secrets of Accordion playing. Explained with photo chart EXCELSIOR Aee trates ce Aceoriign toa ley, Correspondence Courses In) à SPECIAL aE RADIO and ELECTRICAL ENGINEERING $96 333 SIXTH AVENUE, NEW YORK Dept. 1376 ELECTRICAL ENGINEERING Covers. complete elec. Prepares you for y 7 ern poures So simplified anyone can wie nela ure S AND E ELECTRONIC ENGINEERING Dan smodern course in radio ddress, photo- eloctrle work, Trains you to be super- service” Tone reat vacuum tube tec! niclan. Student pin, diploma given. Tuition ONLY $25, elther course. Ask about deferred payment plan. Send name quick for free coples of school catalogs, = student magazines, complete details, SEND NOW! LINCOLN ENGINEERING SéHOOL, 655-12 So. 37th St., Lincoln, Nebr. $50 To $100 A WEEK! ecessful students are now making big imple methods make it fun to learn artooning and Designing at home, in spare time. New low tultion rate. White for big fice be book: “ART for Pleasure and Prost,” today. STUDIO. “207, WASHINGTON SCHOOL OF ART 1115—15th ST.. WASHINGTON, D. C. BUILD YOUR OWN FURNITURE Full details in 1935 Handy Man’s Manual Send 50c to Modern Mechanix Publishing Co. Fawcett Bldg., Greenwich, Conn. “KNEE ACTION’ for Your BICYCLE Float over cobble stones with ONLY, 1936 Packard smoothness. Sail 00 $ over curb stones with hardly a jar. Ride mlles farther and faster with- nut getting tired. Anyhody can attach KNEE ACTION quickly to zan make or size bicycle $ £ wo minutes with a é Mrencht Nothing to wear out or get out of order. COMPLETE Patents applied for. ER a lifetime. Be first in your town. D NO MONEY!—Rush postcard for your KNEE, ACTION and instructions. Pay postman plus few cents postage on delivery. oF Hot Aatiphted in 15 days, return and we'll refund yours de onar. We include FREE details on haw to make money selling to îr ienis, PACKARD RNEE ACTION CO., Dept. C-963, OG Marburg Ave., Cincinnati, snio o “Shimmy'' 134 Brig. Gen. Arnold Surveys Flying [Continued from page 133] iated industries have felt the effect of this growing, new business. Along the slopes of the Pacific Northwest, scouts are hunting lumber, perfect spruce, to build into aircraft spars and longerons. Mention has already been made of the new metal, dural, used largely in transport and war-plane manufacture. The necessity for this provides work for metallurgists, work for aluminum alloy plants, and production of the raw material in no mean proportions. The necessity for the many plane and en- gine instruments special to aircraft provides employment for a considerable number of skilled watchmakers and allied artisans in the instrument field. Oil Industry Feels Boon Of Aviation Mention has already been made of the boon to the oil industry resulting from the special requirements of aircraft power plants. This necessity has led all the leading oil com- panies to install special aviation units to supervise the provision and distribution of these products. Providing airplane clothing has furnished work to many. Aircraft engine manufacture has been a distinct aid to the steel producers and their employes. When it is realized that more than six thousand airplane engines have been built in this country in a year, the effect upon the steel industry and its affiliates can be realized. Then there are the men needed for airway and airline installation. Many employes of airlines and of the Airways Branch of the Department of Commerce are necessary to provide a safe causeway for the misnamed “trackless traffic.’ Radio operators, four to five in number, are required at each stopping point and weather station. Mechanics Needed At Way Stations Each way-station along the route employs licensed mechanics—airplane and engine— for the service of the craft which pass through. These men are especially schooled. They get their Department of Commerce licenses only after stiff examination and long apprenticeship. The larger terminals afford employment to a multitude of varying tradesmen, mail handlers, bootblacks, clerks, typists, barbers, bell-boys, restaurant waitresses, signal men, gatekeepers, guards, and unskilled and un- classified laborers, in addition to the regular airline employes connected with plane traffic. As to pilots and co-professionals: There was a time when any enterprising young man possessed of the urge and the courage could learn to fly for a few dollars per hour. Per- Thank You for Meiutionina Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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haps that can be duplicated yet, but the student who completes one of these brief courses will find that there is no place for him in the industry. He has simply wasted his time. The airline pilot in demand today is a professional. He is a professional because of the high standard set for original selection and because of the time and funds required to complete his instruction. acteristic that airline pilot training has in common with the professions in the long ap- prenticeship, similar to the interne period of the young medical graduate. A thorough pilot’s course will require a minimum of one year. The applicant should have at least a high school, and preferably a college educa- tion. In addition to learning the rudiments of pilotage, he will be taught mechanical sub- jects to familiarize him with the equipment he is to use; he will receive radio instruction because he will have to operate radio equip- ment constantly when he becomes a co-pilot. He will be given courses in meteorology and map reading. Good Navigators Are Scarce Another employe of one type of airline may also be classed as a professional. He is the navigator. On airlines across long spans of water, such as the Pan-American “Route to China,” navigators are employed. We class them as professionals because of the high standards set up in original selection. Another semi-professional called for by the aviation industry is the meteorologist, the man who “makes” the weather. These men are generally former employes of the Weather Bureau. However, several colleges are now giving special courses designed to build the college student up to fit this station. Future Of Aviation Is Bright What is the future of the air employee? There is no present prospect that any of the trades, businesses or professions which have been described will fade from the air picture. On the other hand, there is every reason to believe that all will continue to offer sure fields of lucrative employment as the industry grows. Aviation employes have one distinct advantage over all others. They are con- nected with an infant industry. The field does not tend to be over-crowded. During the great boom days, immediately following 1927, many flocked into aviation looking for thrills and romance or for quick fortunes. Nearly all were dismally disap- pointed. Flying, like its allied pursuits, is a serious business with normal rewards. But one reward it gives profusely. Its workers must feel the stimulus of the fact that they are intimately connected with a live, growing, rapidly expanding industry. There is nothing dying or decadent about this flying business. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Another char- | COMPLETE AS SHOWN i LESS MOTOR ER They're all tatking about it—master craftsmen, work shop speciallsts, lovers of fine precision equipment— because never before has such a modern back-geared serew-cutting lathe been offered at such a price, 10” swing, built-in ad- Justable counter-shaft, V- belt drive, automatically reversible power feeds, Cuts 4 to 96 threads per inch, .001 accuracy, Sold on easy terms with 2 weeks trial. Send coupon TO- DAY for catalog of lathes, drill presses, and tools. FREE CATALOG DRILL PRESSES City and State ATLAS PRESS CO., 752 N. Pitcher St., Kalamazoo, Mich. Under C.P.A. Supervision—At Home in a Few Short Months SVE) ~Newer—Quicker—Simplified HOME Men and women with thorough book- STUDY keeping and business training in greater de- = mand than ever before. Previous experience 3 i unnecessary. “Business Tech” training quali- s fies you at 14 the cost and in a fraction of the usual time. “Short Cut” your way to pro- motion and more pay under expert C.P.A. 3 are Placement Service PREP. of 4 SFREE extra charge et a better position. ree book gives details-—mail coupon for it PLACEMENT 1 TODAY! _ SERVICE INSTITUTE OF BUSINESS TECHNOLOGY CRA ee +65, Dept. AL-210, Chattanooga, Tenn. ADUA 5 =a an am an ye om am mm e m n o a o INSTITUTE OF BUSINESS TECHNOLOGY. pt. AL-210, Chattanooga, Please send me your PREE book and details as to how I can I shorteut’?? to promotion and more pay at home, in spare time. Name ] aadress Lez PET PE EEE State On a u U mE u es ee ees 0 ee 2 2 ee a 135

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A. C. GENERATORS PRACTICAL changes for automobile generators. See our advertisement at bottom of page 121. Autopower, Inc. ADVERTISING AGENCIES LEARN Advertising quickly at home. Easy practical plan. No text books. Common school education sufficient. In- teresting booklet and requirements free. Page-Davis School of Advertising, 3601 Michigan Avenue, Dept. 2044, Chicago. ADVERTISE: Get mail-order_ business, agents. Free assistance, Free Ad- Guide of newspaper, magazine, circula- tions, rates, mailing-lists. Chicago Ad- vertising Agency, 22 West Jackson, Chicago. ADVERTISE—24 words in 250 news- apers $10. Lists Free. Advertising Bervice Bureau, 4258B Drexel, Chicago. 30 WORDS, 25 magazines $1.00. Good- all Agency, 230 Bankers Investment Bldg., San Francisco. FREE NEW advertisers rate guide. Brown Advertising Agency, 140 South Dearborn, Chicago. AGENTS WANTED MEN OR WOMEN—Look after local Coffee and Tea Route. Call on homes with 300 highest quality necessities, Spare or full time. No investment. Permanent. Pay starts immediately. Bright future. Blair Laboratories, Dept. 613-X, Lynchburg, Virginia. BIG MONEY and Fast Sales. Every owner buys Gold Initials 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. $6.85 HOURLY!—Amazing No-Flatz fixes punctures without patching; makes tires puncture-proof! Instantly, perma- nently seals holes made by nails, ete. Big seller. Free sample offer. No-Flatz, Dept. C-164. Cincinnati, Ohio. _ MAKE Good Money Taking Orders; Shirts, Ties, Underwear, Dresses, Hosiery, Raincoats, Pants, Uniforms, Sales Kit Free! Nimrod Company, Department 132, 4922-28 Lincoln Ave- nue, Chicago. $6.00 HOURLY. Amazing Karnu Re- finishes autos like new without rubbing, polishing, waxing or painting: Wipes on with cloth. Lasts 8 to 12 months Free Sample, Karnu, Dept. C-84, Cin. cinnati, Ohio. AMAZING scientific discovery, Motor Aid, gives pep, speed, power, more mileage, cleans carbon, agents 400 per cent profits, rush 35c for samples. Motor Aid, 1455 N. Ogden Ave., Chi- cago. Ill. PLL Give You groceries at wholesale besides splendid opportunity to make $60 a week. Brand new Ford Sedan given as bonus. Details free. Albert ie 2737 Monmouth, Cincinnati, io. PROFIT with new products, Make, sell, repeat. Analysis. Research. Guaranteed formulas. Special prices, leads. Biggest catalog free. Gibson, Chemist, CE-1142 Sunnyside, Chicago. WHERE To Buy At Wholesale 500,- 000 articles. Free Directory and other valuable information. Maywood MM. Publishers, 925 Broadway, New York. 136 Classified Advertisements Rate for classified ads, {8c per word (include name, address and all numbers) per insertion. accompany order and be received In this office June 3rd for the August issue (on sale June 29th). Modern Mechanix & Inventions, [501 Broadway, Rotary Clock Gives Time At A Glance Time at a glance is furnished by a rotary clock having neither hands nor face. The clock bears numerals about its circumference, and as it revolves, time is shown by a stationaty indicator. SELL Colored Folks: Hair Straight- ener, Bleach Cream, Perfumes, In- cense, 300 Products. Write for free samples. Big money making offer. Valmor, 2241 SM Indiana Ave., Chi- cago. COSTS 1c—Sells 25e. Make Non-ex- plosive cleaner from benzyne crystals. le gallon. Sample 10c. Literature free. Western Reserve Laboratories, 6614 Denison Ave., Cleveland, Ohio. AGENTS: Smash go prices. Santos Coffee 12c 1b. 100 Sticks Chewing Gum 12c. Christmas Cards, 21 in box, 14c. 150 other bargains. Carnation Co., MN, St. Louis, Mo. 1000 BARGAINS, Drygoods, Notions, Drug Sundries, Specialties, Novelties, Agents undersell stores. Free catalog. Jobbers, Dept. 798-A, 504 S. Crawford, Chicago. CASH Income Daily Silvering Mirrors at Home. Plating Autoparts, Table- ware, etc. Combination Outfit. Write aoe) Plater, 850, Marion, In- iana. GOLD Reflecting Letters for store windows. Easily applied. arge sizes, penny each, free samples! Atlas Sign Works, 7941-G Halsted, Chicago. BIG MONEY applying gold initials on automobiles. Easiest thing today, No ex- perience needed. Free samples. “Ralco,” 1084 Washington, Boston, Mass. MAKE PRODUCTS YOURSELF— Get the whole profit! ‘Tested Formulas —-catalogue free. Grinstead Labora- tory, Edwardsville, Illinois. GOOD Income plating Auto Parts, Reflectors, Mirrors, by late method. Free particulars and proofs. Gunmetal Co., Ave A, Decatur, Ill. USE $500? Raise Canaries for us. Guaranteed market. Free particulars. Crimmins, 3741C, 60th Woodside, New York. AGENTS’ Gold Sign Letters for store windows. 500% profit. Free sample. | Metallic Letter Co., 426 N. Clark, | Chicago. New York. Minimum 10 words. Cash must Address Classified Mor., ART NOVELTIES “FREE Instructions,” Write for free 10-page Booklet on making beautiful, fast-selling Novelties, Bookends, Plaques, ete. Big demand! Big profits! Stewart’s Studio, 2102 West 19th, Chi- cago, Dept. M75, AUTOMOBILES SEMI - DIESELIZE - TO - ECONO- MIZE. Burn cheap Diesel Oils in any car engine. Costs less than $5.00 to convert. Parts available anywhere. Anyone with ordinary mechanical abili- ty can quickly install. More mileage at less cost. Guaranteed instructions and drawings $1.00. FREE trouble shooting chart. Write today. Earl Behl- ing. Box 944, Los Angeles, California. ARC WELDER—75_ Ampere, D.C. Build your own from Dodge generator. Weld fenders, light castings, etc. Com- plete blueprints and simple instructions, $1.00. Paint Striper—For automobiles or any decorating job, Latest guaranteed tool, $1.00. Agents write. Cash or C.O.D. C. M. Carlson, 2212 Grand Ave., Omaha, Nebr. JUST OUT! 1937 Dieselizing Plans. Genuine, authentic, reliable. Postpaid $1. Remember success depends upon instructions alone. Guaranteed success here. Particulars stamp. Research, 126B Lexington, New York, SEMI-DIESEL Conversion works ou any car. Install yourself for less than $5. Blueprint instructions 50c (coin). Maydwell-a Mfg. Co., Box 492, Glendale, ali GARAGEMEN—Time motor while running. Checks cam wear, vacuum advance. Light $2.25. Rays Mfg. Co. Box 613, Anderson, Ind. WHILE THEY LAST! Former guar- anteed $1.00 Dieselizing Plans now 25c. Hurry! Research, Napanee, Ontario, Canada. AVIATION ARMY AIR CORPS gives free flying training, salary, expenses paid. Infor- mation pamphlet, how to apply, 20c. Same information, Navy Aviation traine ing, 20c. Information on Marine Corps Aviation, 20c. All three, 40c. Used airplanes, $40 and up. Literature 10c. Continental Sales, Box 344, Dept, 23, Indianapolis, Ind. GET INTO AVIATION. Air trans- port pilots get up to $7,000 per year; mechanics, $2,500. Learn at this Gov- ernment approved school. Write for complete information, State age. Lin- coln Flying School, 4002 Aircraft Bldg., Lincoln, Nebr. AEROPLANES, New Production, $98.00. Easy payments. Propellers for aeroplanes, boats, sleds, wind-driven generators, $2.50 up. Send 25c for more information. Hibbs, Fort Worth, Texas. YOUNG men aviation under interested in entering Apprentice Plan write enclosing stamp. Mechanix Universal Aviation Service, Strathmore Station, Dept. E, Detroit, Mich. Thank You for Mentiontng Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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_ BEAUTIFUL PICTURES Form MATCH BOX COLLECTION coe MADEIN AUSTRIA | Finding that many of the European safety match boxes were decorated with beautiful color pictures led a German hobby fan to limit his collecting to odd match box labels. In his collection are boxes from nearly every country in the world. A few of the most unusual ones in the form of women’s portraits from match boxes from Austria and Japan are shown here. BUILD the Nimmo High-Speed Sport- plane. 10c for details, Nimmo Air- craft Co., Box 6151 Met. Station, Los Angeles, California, Dept M. BLUEPRINTS BASEBALL Dart Board Charts 36-in. Sq. List of prints furnished. R. Fields, Box 1058, Lindenhurst, N. Y. BOATS HOW TO BUILD 20 BOATS—The big new edition contains twenty differ- ent up-to-date plans for sailboats, ice- boats, rowboats, outboards, cruisers, and speedboats. The price for the book, 50 cents, makes each plan cost only 214 cents. Order your copy from Modern Mechanix Pub. Co., Fawcett Bldg., Greenwich, Conn. BUILD a Kayak from our cut-to-fit kit. Single or two-passenger. $8.45 up. Everything furnished, Parts guaran- teed to fit perfectly. Mail dime for literature. Refunded with order. James- iwn Specialty Co., 377M, Titusville, a. ROWBOATS — Easily constructed. Complete plans, specifications, details. State length desired. $1.00. V. & B., 913 Village, Kalamazoo, Mich. BOOKS SPORTSMEN’S MANUAL—The out- doorsman’s guide, containing scores of practical articles by America’s leading outdoor writers, covering every phase of fishing, hunting, camping, and trap- ping. This book, edited by Robert Page Lincoln, will make that next vacation a dozen times more enjoyable. Price 50c at your newsstand, or order directly from Modern Mechanix Publishing Co., Fawcett Bldg., Greenwich, Conn. BOOKS! BOOKS! BOOKS! No matter what you want in the book line I can fill your order. If you cannot find the books you want send 25c in silver for my book catalogue today. Levi Bryant, 654 East 44th Street, Chicago, Ill. FREE! Big catalog describing hun- dreds of hooks on various subjects. Franklin Publishing Company, 800 North Clark Street, Dept. 2900, Chi- cago. FREE—Send for list of new technical books at sensational discounts. I, WINN, 124 West_23 St.. New York. BURIED TREASURE TREASURE Seckers—Learn scientific methods. Wyss, 104% Francis, St. Joseph, Mo. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers BUSINESS OPPORTUNITIES RUBBER MOLDS made with our com- position equals rubber. Cold process. Anyone can do, Learn marbleizing with snow white composition. Learn Papier Mache work, Amateurs make big money. Dime brings rubber mold and marblcized cast. Cowell Institute; Grayling, Mich. LIQUID MARBLE—Anyone can make! Colorful, glazed! Moulded, brushed, sprayed. Rubherlastic Moulds. Composition Flooring. Big money mak- ing these! Particulars free. Marbleiz- ing Service, Edwardsville, Tllinois. START Own | Business Mirrors, Refinishing Metal, Articles, Autoparts, Tableware. Exe perience unnecessary. Small invest- ment, Combination Outfit. Sprinkle, Plater, 845 A, Marion, Indiana. RAISE Giant Bullfrogs: Use pond, swamp, creek, Ready Market—Big Profit. Send 50c for complete hook explaining easy inexpensive method, Ohio Frog Industries, 10-A, Steuben- ville, Ohio. IF You Have Some Spare Room, a base- ment or garage where you can do light work, see our offer to Branch Mani- facturers on page 120. Metal Cast Prod- ce Co., 1696 Boston Road, New York ity. PROFIT with new products. Make, sell, repeat. Analysis. Research. Guaranteed formulas. Special prices, leads. Biggest catalog free. Gibson, Chemist, CE-1142 Sunnyside, Chicago. A DOUBLE rubber mold, material, complete instructions to start your own business. No experience. A wide range of ideas, Price Two Dollars, Etruscan Studio, 11411 Union Ave., Chicago. DIRECTIONS and formulae for manu- facturing your own chemical products, Any guaranteed formula for $1.00. McGillicuddy Laboratories, Box 1093, Seattle, Washington. Resilverin Plate FREE PLANS, Books, Circulars. Make Thousands of Dollars selling by mail. Home Spare Time. Mail Order Institute, 193-L, 193 Tompkins Ave., Brooklyn, N. Y. 20TIT CENTURY mail order business, Earn thousands of dollars. Home, spare time. Free literature. Gold- brook Co., 479 Broadway, Brooklyn, N. Y. OPPORTUNITIES — Re your own boss, earn $400 month with single plan. Many other, plans. Booklet sent frec. Pybitshing Service, Box 101-B, Aurora, LEARN Sign Painting and Show Card Writing at home. Earn $50 to $100 Weekly. Particulars free. H. Pomeroy, 1121 7th, Des Moines, Iowa. EARN MONEY: Learn corresponding for Newspapers and Magazines. Write Publishers Service Bureau, 4258& Drexel Blvd., Chicago, Ill. CAN you copy simple cartoons? You may earn up to $37.50 weekly, duplicat- ing for advertisers. M-Syndicate, Argyle, Wisconsin. SUCCEED With Make-Sell them, Formulas, Analytical Service. Catalog free. A. Thaxly Co., Washington, D. C, GET barrels of money-making mail. Your name in 10,000 Directories, 25c. Roservice, 4627 Glenshade, Cincinnati, SELL by Mail! Books, Novelties! Bar- gains! Big profits! Particulars Free! H. Elfeo, 525 South Dearborn, Chicago, MAIL Business. Start small. Every- thing furnished. Free details. Metro- mails, M-7. Cincinnati. LOCAL or Mail Order Business. Par- ticulars Free. Wright, 1032 W. 66th Street, Los Angeles. 500.000 WHOLESALE SUPPLY SOURCES. Complete list 10c. Duffy- Co., Covington, Ky. BUSINESS. 100% Profit. Small in- vestment. Sure thing. Vanderpools, Springfield, Ohio. MAKE Big Money, Be a safe expert. Wayne Strong, 313 West Wilson, Glen- dale, Calif. MAIL ORDER Opportunities. Litera- Your Products. ture. Silvester & Co., Old Bridge, N. J. FREE “Folder of Opportunities.’ Write Fairmount, 9 Hester, New York, CAMERAS AND PHOTO SUPPLIES CAMERAS and supplies. Free illus- trated catalog listing everything photo- graphie—still and movie cameras, films, lenses—at tremendous savings. Thou- sands of bargains, new and used. All guaranteed. We take your old camera or equipment in trade. Write now for your Free copy of, our Photographic Almanac and Bargain Book—just out! Limited edition. Hurry! Central Camera Co., (Photographic Headquar- ters since 1899), 230 S Wabash, Dept. J-17, Chicago. MAKE MONEY in photography. Learn quickly at home. Spare or full time. Easy plan. Previous experience un- necessary. _Common school education sufficient. Interesting booklet and re- quirements free. American School of Photography, 3601 Michigan Avenue, Dept. 2044, Chicago. 137

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_ STAMPS SHOW MARCH IN MODERN TRAVEL All forms of modern travel are depicted in these interesting postage stamps which have been eagerly sought From left to right are the stamps of Chile, showing a modern seaplane; the Normandie stamp, everywhere, |

aS eal ecrats France; streamlined train, from a recent German series and Persia’s stamp of a European type express train crossing a steel span,

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. $50.00 WEEKLY with kodak! 25c silver. Weston, 607-8 South, Seattle, Wash,

CHALK TALKS LAUGH Producing Program, $1.00. Catalog free. Balda Art Service, Dept. 65, Oshkosh, Wis, CHARTERS DELAWARE Charters: Complete in- corporating and organizing service $35. Submitted forms. Chas. G. Guyer, Inc., Wilmington, Delaware. CHEMISTRY SEND 25c for new illustrated chemical Experiment Book with over 300 formu- las and tests, Also receive entry blank for $100.00 Cash Prize Contest. Tl-

lustrated catalog of apparatus and chemicals free. J. Winn, 124 West 23 St.. New York City. COMPLETE chemical serviee—Ana- lyses, industrial problems, formulae, equipment. Free estimates. McGiili- cuddy Laboratories, Box 1093, Seattle, Washington. FREE—Send for list of new technical hooks at seusational discounts. K. Winn, 124 West 23 St, New York, CURIOS—-RELICS

110.000 BARGAINS: Firearms, In- dian Relics, Antlers, Antiques. Photo- list 10c. Museum, Rutland, Illinois.

DETECTIVES POLICE WORK INTEREST YOU? Then send stamp today for full infor- mation of FREE MEMBERSHIP and how to earn big money in this fascinat- ing, adventurous work. National Po- lice Patrol System, Box 1944, Phoenix, Arizona. BECOME a Successful Detective. Ex- perience unnecessary. Detective Paper and Particulars FREE. National Sys- tein, Box 425-D, Fremont, Nebraska. DETECTIVES—Malke Secret Inves- tigations. Experience unnecessary. De- tective particulars free. Write. George Wagner, 2640-V Broadway, N. Y BE A DETECTIVE. Make secret in- vestigations. Experience unnecessary. Write United Detective System, 1623D W. Grand, Chicago. 138

DUPLICATORS INCREASE Business, “Excellograph” Rotary Stencil, Clay, and Film Duplica- tors $3.85 to $37.50. Prints anything typewritten, penned, drawn, traced. olors, Folder Free. Pittsburgh Type- writer Supply, Suite 519, Pittsburgh, Pa. EDUCATIONAL AND INSTRUCTION WANTED Immediately, Men-Women, age 18 to 50, qualify for next eligibility test for steady Government Jobs; com- mence $105-$175 manth. Common edu- cation, paid vacations, pension. Valu- able information from our Civil Service Expert mailed Free. Write, Instruction

Service, Dept. 234, St. Louis, Mo., Today. MEN WANTED—Learn Tool & Die Making. Automatic Screw Mach. Machinist Trade. Big Demand, Actual Experience. Expert Supervision. Write for FREE Book “M”, Allied Screw Machine Co., Inc., School Div., 603-9 Lake St., Chicago. WANT GOVERNMENT JOB? Start $105-$175 month. Men—women. Pre- pare now for next announced examina- tions. List positions, FREE. Write immediately. Franklin Institute, Dept. L-74, Rochester, N. Y. WINDOW Trimming, Crepepaper dis- plays. professional instructions. Earn and learn in four weeks, Advance Dis- plays, 1553 Madison, Chicago. FOREST Jobs available $125-$175 month, Cabin, hunt, trap, patrol. Qualify immediately. Write Rayson Service, B-32, Denver, Colo.

ELECTRIC REFRIGERATORS MACHINE Costing $24.50 changes ice-box into automatic electric refrigera- tor. Build it yourself. Blue prints: Automatic refrigerator $1; Changing auto compressor 10c; Holder for cutting ice or sawing bone 10c; Electric plant costing less than $10 and 5c each day for fuel, $1. Onia A. Koistinen, Box 107-A, Lake Norden, S. Dak. ELECTRIC WELDERS ARC WELDER—Build your own EASY. Guaranteed to weld 16 ga. and up. Complete plans $1.00. G. & W. Mfg. & Plans Service, 1449 Loretta Ave., Columbus, Ohio. ELECTRICAL SUPPLIES HUNDREDS of new and rare items, replacement parts and supplies. Send 10c for new, 60-page, wholesale cata- log. Autopower, 412 $. Iloyne Avenue, Chicago.

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 in- ventors have secured financial as- sistance; show interesting inventions; illustrate important mechanical move- ments. With books we also send Free Evidence of Invention form to help establish date of disclosure. Prompt service, reasonable fees, special de- ferred 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. Ad- dress: Victor J. Evans & Co., Reg- istered Patent Attorneys, 821-H Victor Building, Washington, D. C. INVENTORS—Write for New Free Book < ‘Patent Guide for the Inventor” and “Record of Invention” form. No charge for preliminary information. Clarence _A. O’Brien and Hyman Ber- man, 28-R Adams Building, Registered Patent Attorneys, Washington, D. C.

WE Successfully Sell inventions, pat- ented and unpatented. Write for proof, and tell us what you have fer sale. Chartered Institute of American Inventors, Dept. 5-B, Washington, SELL your ideas. Complete sale, patent, and model facilities. The In- ventors Guild, 4th Floor Central Build- ing, San Antonio, Texas. ‘The Gate- way to Old Mexico.” INVENTIONS patented, unpatented successfully sold. Mail 10c for “Copy- righted Sales Protective Plan. The Inventors Guild, Central Bldg., San Antonio, Texas, INVENTORS—Sell your before patenting. Free particulars. Write W. T. Greene, 942 Barrister Building, Washington, D. C SMALI, inventions wanted by manu- facturers. I’ll help you sell your in- vention. S. Hull, 7829 Euclid Ave- inventions

nue, Cleveland, Ohio. SELL your invention yourself. Expert, inexpensive information. Cole Asso- ciates, Syracuse, N. Y. GET YOUR own patent: Legal blanks, full instructions $1.. W. Rigal, 326 Stanley Terr., Chicago.

Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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FORMULAS cosmetics, inks, special- ties, insecticides, trade secrets, Complete collection. Tested; guaran- teed. $1.00. E. McLaughlan, Box 138, Yonkers, N. Y. ANALYSIS. Research. Newest guar- anteed formulas. Biggest catalog free. Special prices, leads. Gibson, Chemist, CE-1142 Sunnyside, Chicago. SUCCEED With Your Products, Make-Sell them. Formulas, Analytical Service. Catalog free. A. Thaxly Co., Washington, D. C TESTED FORMULAS —Lowest Prices! Newest, Guaranteed. Catalog Free. Grinstead Laboratory, Edwards- ville, Illinois. FORMULAS—Latest money makers. Literature free. D-Belfort, 4042 N. Keeler. Chicago. ICELESS ICE! COLDER! Cheaper. Tnstructions 25c. Covington, Ky. FORMULAS—AII kinds. Guaranteed. Catalog Free. Kemico, 67, Parkridge, Illinois. POLISHES, Cleaner! Duffy-Co., FROG RAISING RAISE frogs; be independent. Start in back yard. Free Book. Write today. California Giant Frog Farms, Dept. E, Santa Rosa, Calif. HELP WANTED PROFIT Gathering Roots, Herbs, De- tails 10c. L. Merritt, 1752 Nicholson, St. Louis. HYPNOTISM HYPNOTIZE Instantaneously! Learn how! Instructions 25c. Lonk Institute Hypnotism, D-1313, Palatine, Illinois. INVENTIONS INVENTORS’ Primer answers every question right. Saves you dollars. Copy postpaid $1.00. Adam Fisher Co., 582 Enright, St. Louis, Mo. ete. , MALE HELP WANTED LOCAL AGENTS wanted to wear and demonstrate Free Suits to friends. No canvassing. Up to $12 in a day easy. Experience unnecessary. Valuable demonstrating equipment, actual samples free. Progress Tailoring, Dept. G-219, 500 Throop, Chicago. MALE & FEMALE HELP WANTED MRS. M. earned $267, three weeks, raising mushrooms in cellar! Excep- tional, but your cellar, shed perhaps suitable. We buy crops. Book Free. United, 3848-A85 Lincoln Ave., Chi- cago. MALE INSTRUCTION DETECTIVES. Work home or travel. Experience unnecessary. Write, Ameri- can Detective Institute, 2640-T Broad- way, N.Y, a MIDGET AUTOMOBILES BUILD a Midget Miller Racer. Com- plete plans for constructing this authen- tic midget automobile appear in the new 1936 edition of How-To-Build-It along with many other interesting home and workshop plans. Send 50c for the 148- page book to Modern Mechanix Publ. Co.. Greenwich, Conn. MISCELLANEOUS JOIN! The International Scientific Association. The club for the science- hobbyist. Send ten cents for sampie journal. 31-51 41 Street, Long Island City, N. Y. RECEIVE gigantice mails. magazines samples. Your name in 1,000 mailing lists 10c. Fairbanks Mailer, 100 Forsythe, New York. OIL DEPOSIT Locating Solution. De- tails, sample, and instructions 25c. W. Marshall, Box 303, Baytown, Texas. FACTORY Finish Your_ Furniture. Complete Instructions, Dollar. L. Wright, 426 E. 6th St., Peru, Ind. THREE manufacturers’ names of any article 25c. Additional, 10c each. Box 2235 Paterson, N. J. HAVE you a sound, practical invention for sale, patented or unpatented? Jf so, write Chartered Institute of Ameri- can eee Dept. 5-A, Washington, 2 C INVENTIONS Commercialized. Pat- ented or unpatened. Write Adam Fisher Company, 582 Enright, St. Louis, Mo. LAMP INSECT KILLER ELECTRIC Lamp Kills insects indoor or out. $2.75 and up. Literature free. Sauer Brothers, Oakland, Calif. LATHES METAL Turning Lathe complete, $6.95. Depoy Model Shop, Muncie, Ind. MACHINERY, TOOLS AND SUPPLIES SPRING winders $3.00. Myers Spring Winder Co., 111 Washington St., Bur- lington, Iowa. MAGIC TRICKS & NOVELTIES MAGIC TRICKS, Joke ; Novelties, Puzzles, at lower prices. Magic” postpaid 10c. You will be surprised! Lyle Douglas, Station A-14, Dallas, Texas. LEARN MAGIC — Large Illustrated Catalog of tricks. You Can Do, 25c. Holden, 222 West 42nd St., New York. MALE HELP—AGENTS 1,000 BARGAINS, Drygoods, Notions, Drug Sundries, Specialties, Novelties. Agents undersell stores. Free catalog, Jobbers, Dept. 898, 504 S. Crawford, Chicago. 10c BRINGS Copy “National Mail Order News”, Box 1773-MM2, Roan- oke. Virginia. MODEL MAKING MODET, Railroad Supplies “O” gauge (14” scale—1 14” between rails) Freight car Body Kits, painted and lettered $1.00 (will run on toy tracks). Choice of 20 Cars. Catalogue 6c stamps. Westbrook Company, Hasbrouck Heights, New Jersey. EASY-BUILT 00 GAUGE (%-inch between rails) box and refrigerator car body construction kits $1.00. Choice of ten cars. Catalogue one dime. Nason Railways, Dept. X7, New Rochelle, New York. MODEL Steam Locomotive 34” scale. Easily made. Particulars, casting list, photo, 25c (ret. on Ist order). Little Engines, Box E-15, Wilmington, Calif. MODELS & MODEL SUPPLIES YOUR Ideas developed into practical working mode 30 years successful experience; thousands satisfied custom- ers. Confidential service guaranteed. Bank references, Send 3c postage for 32 page book “Making Inventinns Pay.” Crescent Tool Company, Dept. T. Cin- cinnati, Ohio. EVRAY’S Models—Engine Castings, Books, Blueprints, Materials and Sup- plies. Advance Bulletin illustrated cir- cular for stamp. EVRAYmesco, 28 No. Clinton, Chicago. MONEY-MAKING OPPORTUNITIES POPCORN Machines, all kinds, New used, kettles. Nortside Mfg., 2117- Harding, DesMoines, Iowa. Thank You for Menticning Modern Mechanix Hobbies and Inventions When Writing to Advertisers MOTION PICTURE AND SOUND EQUIPMENT SUPERSPEED Panchromatic 16MM film, 100 ft. $3.75. Other films from $2.19. Bargains in new, used equip- ment. Send for circular. Fotoshop, 1344%F West 32nd, New York. LEARN Motion Picture Theatre Busi- ness. Home-study training: Manage- ment, Advertising, Projection. Free Catalog. Theatre Institute; 345 Wash- ington, Elmira, N. Y. HIGHEST prices paid for used still- movie equipment. Send description. Fotoshop, 13414 F West 32nd, New York. MOVIE Cameras, projectors, screens, Film Library, Sound, Silent, Catalogue free. We buy used equipment. Mogull's, 1944-G Boston Road, New York. 16 MM FILMS bought, sold, exchanged. Catalogue 10c. Fotoshop, 13444F West 32d, New York. MOTORCYCLES SEND Isc FOR ILLUSTRATED used Motorcycle catalog. Bargains. Largest stock genuine Indian parts and motorcycles. Indian Motorcycle Sales, Kansas City, Mo. RECONDITIONED Motorcycles. New and used parts for all makes. Complete service, Whitman Motorcycle & Supply Co., 405-9 Southwest Blvd., Kansas City, Mo. ALLOY Pistons. Harley, Henderson, Indian, Excelsior. Used parts, catalogue and wings pin 10c. Ballak, 1115 Chest- nut St. St. Louis, Mo. MOTOR WINDING DATA WINDING DATA, 100 motors. Single; three phase; various horsepower. $1.00. Motor Data Service, 3002 Monroe, Kansas City, Missouri, MUSIC SPECIAL—90 favorite cowboy songs, 25¢ (coin). Empire Novelties, Peter- horo, Canada. OFFICE EQUIPMENT TYPEWRITERS, multigraphs, address- ing machines, adders, dictaphones, dup- licators, sealers, folders. Save half, write Pruitt, 553 Pruitt Bldg., Chicago. 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 hooks, “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 in- ventors have secured financial assist- ance; show interesting inventions; illus- trate important mechanical movements. . With books we also send Free Evi- dence of Invention form to help_estah- lish date of disclosure. Prompt service, reasonable fees, special ferred 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. Ad- dress: Victor J. Evans & Co., Regis- tered Patent Attorneys, 820-H Victor Building, Washington, D. C. INVENTORS—Write for New Free Book “Patent Guide for the Inventor” and “Record of Invention” form, No charge for preliminary information. Clarence A. O’Brien and Hyman Ber- man, 28R Adams Building, Registered Patent Attorneys, Washington, D. C. 139

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UNPATENTED Ideas Can Be Sold. We tell you how and help you make the sale. Particulars, with list of manu- facturers and wanted inventions, sent free on request. Write W. T. Greene, 958 Barrister Bldg., Washington, D. C. “INVENTOR’S Guidebook” containing 96 mechanical movements and advice about patenting, selling inventions, also “Record of Invention”, Free. Frank A. Ledermann, Patent Attorney-Engineer, 154 Nassau Street, New York. REGISTERED Patent Attorney-Con- sulting Engineer obtains patents and trademark registrations, Write for confidential advice. Z. Polachek, 1234 Broadway, New York City. INVENTORS—My Complete service protects and sells your idea. Write Starck, 333 Wells Building, Milwaukee. PATENTS INVENTORS—-Write for New Free Book ‘Patent Guide for the Inventor” and “Record of Invention” form, No charge for preliminary information. Clarence A. O’Brien and Hyman Ber- man, 28R Adams Building, Registered Patent Attorneys, Washington, D. C. PATENTS. Booklet free. Highest references. Best results. Reasonable fees. Watson E. Coleman, Victor Build- ing, Washington, D. C INVENTIONS Commercialized. ented or. unpatented, Write Fisher Company, 582 Enright, Louis, Mo. Pat- Adam St. gor, Maine. PATENTS—Reasonable Terms. Book and advice free, I. F. Randolph, Dept. 729, Washington, D. C. PERSONAL STUTTERING and Stammering cor rectel at home. Booklet free. Paul J. Wolfe, Box 52, Pittsburgh, Penna. PHOTO DEVELOPING SUPER High Gloss prints on Velox paper by exclusive secret process. Most modern equipped plant assures best re- sults obtainable. Roll developed and ex- pertly printed 25c, reprints 2c, Write for lowest film prices in America. Paramount Co.. Photo Division, 403 E. 92nd Street, New York. FINER Finishing—Rolls devcloped and printed, colored Enlargement, or two double professional enlargements, all for 25c (coin). Genuine Nationally Known Moen-Tone Superior Quality. Moen Photo Service, La Crosse. Wis. $100.00 PRIZE Offer with every roll developed, including 8 beautiful Prints, Professional Oil Painted Enlargement, 25c. Individual attention. Quick eee Janesville Film, Janesville, is. ROLL, Developed, 8 permanent prints, two double weight, portrait-like profes- sional enlargements, prize coupon, 25c. Extra fast service. Midwest Photo, Janesville, Wis. FILMS DEVELOPED—2%5c coin two 5x7 Enlargements, 8 High Gloss Never Fade Prints. Club Photo Service, La- Crosse, Wis. POCKET Album with roll developed and printed 25c. Enlargement Coupon. Ideal Photo Service, Box 2255, Pater- son. N. T. POCKET RADIOS “POCKET RADIO”, $3.85 Complete. Catalogue, 10c. American Business Service, 353-MMM, Shamokin, Penn- sylvania. 140 Midget Microscope Supplies Own Light - A five-power magnifying instrument combined with a flashlight, provides an illuminated two-inch field ready for instant use. A spacer ring keeps the lenses in focus, and the light is so di- rected that while it illuminates object being inspected, it does not strike eyes. POEM—SONGWRITERS COMPOSE Your Own Popular Songs. This is Simple with the Famous Dial System. $2,00 postpaid. Westmin- gen. 2636 University Avenue, Bronx, SONGWRITERS—Get all inside facts. Free booklet by famous Broadway som 12 poser, Songwriters Institute, Broadway, New York, MUSIC composed to words. Send for Box proposition. Arranging Service, 382, Vincennes, Ind. WANTED: Original Poems, Songs. MMM Publishers, Studio Bldg., Port- land. Ore. PRINTING PRINT your own cards, stationery, circulars, advertising, etc. Save money. Easy rules furnished. Print for others, big profits. Junior press, $5.90; job presses, $11; power, $149, Write for details. Kelsey Co., S-57, Meriden, Conn, MAKE money printing! Build your own printing press for less than $3.00, Complete illustrated plans 25c post- paid. Supplies, Box 451, Manhattan, Kansas. 2000 BUSINESS CARDS neatly printed $1.50. Free samples. Atlas Distributing Co., 1814 Bedford Ave., Pittsburgh, Penna. 250 EACH Letterheads, cards. $3.00 postpaid. 3214-M Huron, Chicago. HOMADE Press. Prints colors! Plans 50c. Box 111, Maxwell, California. RABBITS RAISE Angora Wool Rabbits. Big Profits, Each Rabbit shears pound wool bringing up to $6 lb. Wool Samples, Catalogue 10c. Clay Farms, Dept. MD. Sharon, Wash. RADIO & TELEGRAPHY RADIO BUILDERS’ MANUAL—A book of radio set building plans and kinks for the home experimenter. Everything from a crystal set to a powerful 6-tube auto radio is included. Price 50 cents—order directly from Modern Mechanix Publishing Co., Fawcett Bldg., Greenwich, Conn. RADIO Engineering, broadcasting, aviation and police radio, Servicing, Marine and Morse Telegraphy taught thoroughly. All expenses low. Catalog free. Dodge’s Institute, King St., Val- varaiso, Ind. é INSTRUCTIONS 18 Distance Crystal Sets—record 2100 miles; ‘Radio- builder” year; 25c. Laboratories, 151-K Liberty, San Francisco. envelopes, Bradshaw, SALESMEN WANTED GUARANTEED Salary Plus Commis- sions to Producers. New plans under- sell stores. Hundreds fast selling ne- cessities, Free Gifts. Special deals. Rush name for Catalog. National Products, 104, Berwyn, Ill. GOLD Reflecting Létters for store windows. Easily applied. Large sizes, penny each, free samples! Atlas Sign Works, 7941-G Halsted, Chicago, SKIN AIDS ACNE, Pimples, Blackheads, Freckles positively removed at home. Results guaranteed. Kennedy Laboratories, 3005 E. Gd. Blvd., Detroit, Mich, SPECTROSCOPES SPECTROSCOPE with hook of 120 experiments. $2.50. Cudding Sons, Campbell, California. STORAGE BATTERIES EDISON Non-acid Storage Batteries for all types electric light plants. None of the acid battery diseases. Long life. Fully guaranteed. Attractive bargains in light plants, generators, motors. etc. Frawley Smith Co., Croton Falls, zp TATTOOING SUPPLIES TATTOOING Outfits, Supplies—Cata- logue. Guaranteed Remover. “Waters,” M-965 Putnam, Detroit. TELESCOPES, MICROSCOPES, ETC. TELESCOPES, Microscopes, Binocu- lars. Save 15%—50%. Illustrated catalog 10c (Refunded). Teeke Optical, 5156, Evanston, Illinois. TELESCOPES, Microscopes, Binocu- lars. Lowest prices. Optical catalog free. Brownscope Company, 234 Fifth Avenue, New York. BUILD your own Reflecting Telescope. Copy of instructions ten cents. Cata- log Free. Optical Laboratories, Larch- mont, New_York. WELDING GET full-size, 150-pound Electric Arc Welder, only $29.50! Does all types welding, uses all kinds of rods, welds all metals and alloys from motor blocks to fenders, Portable. Power adjustable. Works on 110-volt or 220-volt alternat- ing current. Plugs into light socket. Complete with goggles, welding rod, tongs, etc, Get details Free. Write Commonwealth Co., Dept. G-14, Oak- ley, Cincinnati, Ohio, from old farm light plant. Small cash ay. Gets the job done. Blueprints, specifications, $5.00. City Electric Shop, Snyder, Oklahoma. 150-Ib. ARC-WELDER. 110-220 volts. Uses up to ye rod. Complete $29.50. 60-lb. Spot Welder 16 gauge or yy wire $15.00. Maywood Electric Co. May- wood, Ill. Literature. ARC-WELDER—Build your own from Dodge generator. Membership and Re- liable Instructive Drawings, $1.00. Welders’ Club Of America, 3432 Drake, Chicago. ARC-WELDING Outfit $1.25. Weld fenders, braze, solder. Lavrow, 4368-W, Warren, Detroit. Stamp appreciated. WIND ELECTRIC LIGHTS ELECTRIC Light-Wind Driven, auto- matic control, build your own electric plant. Copyrighted Blueprints. Write Wind Motor Electric, Brainerd, Min- nesota. WIND ELECTRIC PLANTS GENERATOR Propellers, expertly de- signed at factory prices. Hibbs, Fort Worth, Texas. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Found—King Solomon’s Mines [Continued from page 43] surrounded. Ghogoli and his warriors had beaten us to the river! Diressa, our guide, and a panic-stricken one, served as our spokesman, for the murderous sultan was coming up the hill with his mighty retinue. He looked like an apparition, wiry, eagle- eyed, ancient, hook-nosed and evil. We had built our camp in a semi-circle. Guns in hand, we eight white men and our scant band of about 50 quaking porters pre- pared to parley. A Vital Moment It was a moment that might cost us our lives. Through chattering teeth our inter- preter spoke with one of the sultan’s men and then told me: “Ghogoli wants to know what right you have in his country?” I told Diressa to say: “We are the guests of Haile Selassie, King of Kings.” “Not king of this king! Where are your passports?” “Coming any minute with Selassie’s sol- diers from Walya.” “We don’t believe you. Either you stay here as my slaves or pay me 1,000 thalers each for ransom!” The savage sultan’s followers were behav- ing like any bandits would under like con- ditions, yet it was absolutely necessary that we show no fear in front of these murderous- looking Abyssinians. So we expressed will- ingness to accompany Ghogoli to his head- quarters. There was a long palaver. The sultan was not satisfied with our reason for invading his sacred territory. He was certain we came fer his precious gold and pointed out that always he imprisoned or killed all tres- passers. When we asked the sultan why he was ac- cumulating so much gold dust, the answer was: war clouds and fighting in the East. Gold to buy guns for the British to keep out the Italians. Does Italy Want These Mines? And this, mind you, was before the Italo- Ethiopian War began! Yes, here were the ancient mines of the Queen of Sheba being used to help preserve the independence of Abyssinia’s far off, savage provinces. Did we sleep very well that night? Nota wink. As dusk fell, hundreds of savage war- riors, behaving like madmen and shrieking a fiendish gibberish which even our interpreter did not understand, paraded all around us. From time to time they waved gruesome trophies, trophies made of shrunken heads. Suddenly Diressa caught a few familiar [Continued on page 142] Amazingly Easy Way to get into. j | | MANY EARN 330, §40,350 ambag eite | AND UP A WEEK lead to good salaries in Electricity—NOT by correspondence or b jt by an amazing way we teach tight here in the erent Coyne oborot apit PLL FINANCE YOUR TRAINING Mail coupon below for details of my finance plan. Man: in- Ing FIRST, then take 18 months to pay tuition, in cast monthly PA Aa ios 5 montba after they start school, or 60 days AFTER their required 12-weeka Whether your age is 16 or 40 «.- Don't spend your life worrying about lay-offs, low pay and job un- la over. ,, Learn By Doing...in 90 Days You don’t need previous experience or a lot of book learning to master my training, You'll be trained in 12 weeks...by doing actual electrical idajtional insteuction in Diesel Eainess Redriseravion aad Ale COndition? on in Diese! n je: ing included AT NO EXTRA COSL. O 7 ©ofriseration and Alr Condition Many Earn While Learning TE you need part-time work to help pay living expenses while at school, write and tell us. We've helped many students solve this problem. Lifetime employment service after you graduate, Get My Free Book! The training of this 97-year ed. My new book tells all about it, abso ten 18 thoroughly test- lutely free. 48 facts, jobs, salarios. or Dee taa Te 2g iN obligation, so acetone ee Nes H. l z SEND NOW FOR FULL DETAILS H. C. LEWIS, President, COYNE E P 500 S. Paulia St. Dont Booey Cho OTRICAL SCHOOL ©, Alle. Dear Mr. Lewis:Without obligation send Free catalog on C: Training and “Pay-Tuition-After-Graduation’ Plane l l I | Niemen. sitiewienenddiniia snsaaaesaeeosswmunnaiinn N l | Address..cecseee -| Se] ANY PHOTO ENLARGED Size 8x10 Inches or smaller If de- sired. Same price for full length or bust form, groups, landscapes, pet animals, etc., or enlargements of any part of group picture. Safe return of y; orlginal photo guaranteed. : SEND NO MONEY lestat photo or Bre pshot le ny, size) and within a week you will recelve your beautiful life-like enlargement, guaranteed fadeleas. Pay postman 47o f: plus poatage—or send 400 with order and we poy postage. Bl 16x20-Inch enlargement cent C. O. D. 780 plus postage or sen snd we pay postage. Take advantage of this amazing ofer how, Send your photos today, Specify aize wanted, STANDARD ART STUDIOS, 104 S.Jefferson St. Dept. s76H, Chicago = MECHANICS ) & WELDERS | Auto Mechanics and Welders are in big de- > mand, Complete courses in are and ¢ z acetylene welding, metal finishing, Write body and fender bumping, spray paint- for ing. Special low rates. Write today. FREE i AD ‘ MICHIGAN TRADE SCHOOL CIRCULAR 3763 Woodward Ave., MIDGET POCKET RADIO A ae Soke $29 Complete Postpaid Fits in any small pocket easily, Weighs only 4 ozs. as shown. Comes in four beautiful colors (Black, Green, Brown, White). NO tubes, batteries, or elec- trical’ connections needed! Nothing to wear or need replacement—will last for years—only one moving partl Separates and re» celves broadeast stations 2 with beautiful clear tone. H E aitt Fan tease static or ineerfar: MUCH GREATER under good con ons—very little static or Interfere ence! Can ke used by ANYONE ANYWHERE! NO CRYSTALS TO AD- JUST! Absolutely complete with midget phone and instructions to use whe in bed, hotels, 4 home, autos, offices, campi en. hieveles or any place you may be. No complicated or messy hoo! —lakes y Decori to connecti THOUSANDS OF SATISFIED OWNERS. THÈSE ARE FACTS. Send only $1.00 and pay postman $1.08 plus postage on arrival or send $2.99 (Cash, Money Order, Check). Ideal Gift. Guar- anteed. _ State Color. ORDER NOWI (Foreign orders G5c_ extra.) TINYTONE RADIO C9., Dept. M-7, KEARNEY, NEBRASKA Detroit, Mich. NEw!! Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 141

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HOW TO BUILD 20 BOATS NEW EDITION A complete guide oook for boat builders— simple enough for amateurs, yet exacting enough for professionals. Contains detailed instructions for building twenty different boats, designed by leading naval architects. COMPLETE PLANS AND INSTRUCTIONS FOR FOUR MOTOR CRUISERS Ranging from 13 to 30 feet in length FOUR RUNABOUTS Outboard and inboard powered tested designs TWO OUTBOARD SPEEDBOATS Champions in their classes THREE SAILBOATS Including a Moth class racer and Sam Rabl's famous Sunray ICE BOAT—CANOE—RO WBOAT HOUSEBOAT—CATAMARAN Get a copy at your newsstand or send order to MODERN MECHANIX PUBLISHING CO., Faweett Building Greenwich, Conn. 142 Found—King Solomon’s Mines [Continued from page 141] phrases and tcld us that we were camping on the legendary “Execution Hill’! All night the giant tom-toms of the world’s most war- like savages boomed in our nerve-wracked and weary ears. Death to the invaders was certain. Next day Sultan Ghogoli and his oldest son came to gloat over our precarious situation. Our filled money cases and our numerous packages of canned goods and other delica- cies made them envious. They handled our modern rifles lovingly. And again Ghogoli repeated his threat of yesterday: “Haile Selassie doesn’t know you. You leave all baggage, money and guns here and get back to the British Sudan.” A Miracle Happens Only a miracle could save us now. But all was not lost after all. The very next day Ghogoli and company changed their attitude and procedure. Instead of gloating over our unhappy plight, they treated us like kings. Lressed in their grandest finery, they plied us with costly presents. What had happened? Just this: that same morning one of Selassie’s swiftest riders had dashed into the village with the most wel- come news of all—that our long-hoped for military escort from Selassie, plus the all- important passports, was only a few miles away. Yes, the mighty Sultan was a changed man. He was now exceedingly contrite and lavish. He showed us many things no white man had ever seen before: his most valuable golden idols, dating back many centuries, which his slaves had dug up in the surround- ing region; also a number of huge, rough diamonds. We in turn were quite willing to offer presents. And maybe we didn’t bless Haile Selassie! His name was indeed powerful in that wild stronghold of barbarism. Safe At Last From then on our journey back to Addis Ababa was pleasant and uneventful. Next day, accompanied by the Sultan’s tamed, if somewhat sullen warriors, we met Selassie’s retinue of 120 warriors on the bank of the Yabus River. After months of studying the movies and specimens of our exploration trip, I am con- vinced that this was the legendary land of Ophir of Biblical fame, whence came the gold, frankincense and other treasures for Solomon’s celebrated temple in Jerusalem. I also believe that this newly discovered oldest and richest of gold mines is one of the secret, but prime causes of the Italo-Ethio- pian war! Thenk You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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TALK=-SING - PLAY _thru your own radio BROADCAST your voice on programs coming through your radio set--make an- nouncements from any part of house --inject wiae cracks, Josh and mystify Mike’ made especially for home use, attached in a jiffy, Nota Toy. Also put on own pro- 5 grama et home, parties, club § affairs, Barrels of fun] Easy to operate. PRICE 25c POSTPAID Johnson Smith & Co. Dept. 540 Detroit, Mich. CRYSTAL RADIO 25c fe a radio in itself, es it te possible a friends. ‘‘World Thi f; to get reception with it alone within. miles of a atation (or ap to 100 miles under good conditions), Alzon need ia, an serial earphone, Complete! assembledand wired, à with supersensitive crystal, stand, base, crystal cup, arm with gate whisker, ote. ocel on uaran. r niy 25c ppd. Telle how to make inexpen-| sive crystal seta, electric! sets, short waveradios,etc. A Private Electric Teles raph Set for only 15c] so it aa a practice aet lor send meseages to friends (sending and The Boy Electrician blanks, code 100 and instruc- DON'T BE BULLIED The Japanese art of self-defense. New methods of attack and de- fensa are given, illustrated so that @ you cannot failto understand them, Deals fully with. trips: throwa, wrist locks, body holds, defense against revolvers, strangling, arm- locks, scissors, aplits, head lock, holding a man down, double knee Ñ throw,stick attack defenseagainst knife, one hand throat grip, de- fense against two assailants, stome 4 ach throw, secret thumb knockcut, nerve pinches, and numerous oth: Ñ ers. Learn to protect yourself un ği der all circumstances with nature’a weapons, Fear no man, guns or knives! ‘*Sclence of Ju Jitsu” Only 30 cents oostoaid. AUTO SCARE BOMB Age! attached to the > spark plug and the her wire to ang art of the motor. ‘he instant your H policy-catches the thlef in the act. Pri It looka like a deadly weapon, but It is merely e novel Cigs- ha tte Case. etter than the real thing in many an awk- ward encounter. Great fon “‘sticking up’ your friends, They squirm and protest. Pult the trigger and the slide flies open, disclosing the cigarettes. PRICE 25c ppd. Catalog 108 DANCING LATEST STEPS. Ba popu- y lar. Good dancersare always admired --always popular guests. Partners welcome them eagerly. The newest, smartest steps without a teacher. Don’t make excuses when the music starts. Get lota of fan from parties and dances. If you want to become a perfect dencer, learn to dance at home this new, easy way. B K TELLS: How to develop polse and control, improve your dence steps, art of holding, how to walk to muele, how to lead, latest Fox Trot eteps, Natural and Reverse ne, the Reverse Wave, the Quick: . aylng to music, fea, Back war ‘Changes the falta, ontinental, the famous E les dance, the Manhattan, the College Rhumbe, the Carlo, Charleston, end many othere. t Danc. ‘a. Apt O E. Price 25 Conte Postpald, Boys: BOYS! BOYS! THROW YOUR VOICE A; P.. Dy bed oranrenéxe, Lota of x fun fooling teacher, po- ‘4 liceman or friends. The É VENTRILO & little instrament, fits in the mouth out of sight, used with above for Bird Calls, etc. Anyone can ase It. Never falls. A 64 Page course on Ventriloquism only 10 cents postpa I ery of learning the ecalea \ eraving and keys and without fedi- maot wr. did ing Tutor iso greatly nim- plified method, which, after a little practice, enables written in ony “time” or in any “key.” No knowl- edge of music necessary. Once you havc mastered the songs, ballads, waltzes, the latest hits, cte. entirely by ear without any music, Price 12 cenis postpald. REVOLVER STYLE - models now Sg \ out, 25c,50c TEE fogether, with the Ventrilo. All F T ey f Would you like to play the r | ii, | piano or organ without NLD Lk doing throush the drudg- ane NPL ow practice? The Vamp- you to play the accompaniment to any tune or eong aystem, you will be able to play the accompaniment to "=, Three new and $1.00. Gi F Well madeand effect- ne ive. Patterned afte- latest type of Revolvr er. Appearance slone “Ss will scare a burglar. i Takes 22 Cal. Blank Cartridges obtaln- able everywhere. Great protection & galnst burglars, tramps,dogs. Have it Tying around without the danger ale p tached to other revolvers. Fine for 4th of July, New Year's, stage work, a starting pistol, etc. Small size 25°. Medium size ‘S0c. Large size $1.00. Blank eare tridges 50c per 100. Holster (cowboy type) 50c. Shipped by Express only, not prepald. ADDRESS ALL ORDERS FOR GOODS ON THIS PAGE TO “LATEST CATALOG Lane Edition wi Only book of its tricks in magi ri) JOHNSON SMITH sco, JOHNSON SMITH & CO. Dept. 540, 6615 E. Jefferson Ave. „LATEST || CATALOG DETROIT, MICH. * NEW CATALOG mailed on receipt of 10c, or the Do- th cloth binding 25c. Bigger and better than ever, nd In existence. Nearly the newest novelties, puzzles, goods, rubber stamps, unusual and Interesting books, curiositles in 600 pages of the latest james, sporting Seeds and plants, etc., unprocurable elsewhere. Stampa Accepted. Thank You for Mentioning Modern Mechanix Hobbies and Inventions Our Christmas Special! Electric Train Kit AnElectric Train for 2501 Com- pletely Rasembled in a few minutes. Train is beautifully litho- graphed in several colora. Fast, it goes foster than most arge treina. Needs no maki Price, complete 25c, plus 10c postage and packing. ROCKET SHIPS! StepInto the $ i future with ‘a 5 \ Rocket Ship of your ownl Buck Rogers § and Flash Gordon use them, Be cen- turies aheadof anybody in Fi ar neighbor- SS ` ood. evoral a Sai kinds: rocket planes, rocket cars or rocket boats. Complete plans are in book form. Rockets require only about an hour to build from inexpensive materials ob- tainable at your druggist or chemical supply company. WIU go far at high speeds! Price 10c postpa H HOW TAP DANCE Why envy the easy rhythm end fascinating grace of Gtep’n Fetchit, Fred Astaire f ete. Tap dance in ONLY 6 HOURS by anew, simplified course by Prof. Wilson. No epecial ability needed. Bo Friends adore it, Bi dancing is not onl ELECTRIC EVE 25c PHOTO-ELECTRIC CELL entific discoveries th flash of light opens & garage, lighta on or off, stops or stari all television sets. The miracle with a mi experimentor, no inventor (end who isn't) should be without this latest acientlfic novelty. Can also be used to amuse and Gellght Deople by creating weird ef- fects. Lights go off, doors bang, with a flash of light. Electi Eye, onty 25c postpaid. Supersensitive Electric Eye, botter quality, 50 cents postpald. ELECTRIC MOTOR 6000 Revolutions © per Minute I= An Electric Motor for 10c. Sounds almost unbeliev- able but itis perfectly true. i th parta acked in a neat box, with fall speedy! Runs on a No. 6 or similar dry battery. Y can learn more about a motor in 30 minutes than by houre of study, Perform mang novel and interesting experiments with it. Price 10c; postage Sc extra.

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Send for the latest ALLIED Radio Catalog. New Metal Tube radios— battery, 32 Volt. 6 Volt and Auto Sets; dozens of new Set-Builders Kits; every- thing in Short Wave Receiving and Transmitting Equipment; new Public Address Amplifiers and Systems; also thou- “BUILD YOUR OWN” Write to us for FREE parts Jists Lamp Radio; Vest Pocket Receiver; Musical Derby; 2-in-1 Amplifier, Midget P.A. System, ete, We can supply matched kits for build- ing any Modern Mechanix circuit, Write for our FREE parts lists. E 833 W. Jackson Blvd. Dept, B. E W Chicago, Minois. E E O Send me your FREE Radlo Catalog. a || O Send me Parts List for 2.0.22... ccc e cc eee ee ee cee e eee | E : E Hame arerin tst Rk oan AREENA AEE Guages EAk a E AOS. is E E E EERTE AES TA TAE E EEE a SHE'LL SAY “THANKS” 7 and Wake : B A DAY or 500% Profit AUTOMATIC GAS LIGHTER. -4 Packed on individual cards. Samples 10c. Retail 25c. Rush Nu $1 for dozen or $8 for 15 dozen. We pay PP charges. New Method Mfg. Co. Box MG-43, Bradford, Pa. S Two Giant Industries NEED MEN 4 AIR CONDITIONING ELECTRIC REFRIGERATION We supply trained men for America’s two fastest-growlng industries. If you can meet our requirements, we will train you for good pay positions as Installation and Service Expert in the Electric Refrigeration and Air Condi- tioning fields. We will give you an opportunity to qualify for profitable employment with an exceptionally bright future. Can You Qualify? To he acceptable for enrollment you should he mechanically inclined, between ages of 18 and have fair education and be able to furnish character references. FREE BOOK Get amazing facts about actual niong, and for ambitious men in A Condi ionini and Electric Refrigeration. Our new Free Book describes these money- Making opportu: unittes and tells how you can quallfy if you meet our requirements. Write for rou ee copy today stating which industry interests you most: No obligatlon. UTILITIES ENGINEERING INSTITUTE Fstagished 400-410 N. Wells St., Dept. 276, Chicago, Ill. cs 2. ' Daredevil Dub—Menace of Racing [Continued from page 66] again and gone on their way. Then along came the dub. He suddenly saw the human heap lined up in front of his radiatér and, without thinking, he spun into a skid and slammed backwards into the pits just below, emangling the pit attendants. Yet, when it was all over, he was acclaimed a hero by the spectators. Fast thinking and experience with similar accidents would have staved off the disaster that cost two of the pit at- tendants their lives, for the unconscious pilot, apparently dead there on the track, was merely out cold and just a little bruised. For the foregoing reasons, and many cthers, the “dub” is the terror of all veteran pilots. There is no telling what he will do when a mechanical break starts the cars piling up. Talk with any one of the veteran Indi- anapolis Speedway pilots, and he will tell you of the “good old days” when rivals rode wheel to wheel and fought each other in the turns with not an inch to spare between them. Those mechanical jockeys eased long engine strains by getting a tow—riding the suction created by the tail of the hurtling car ahead, with radiator of the car behind seemingly ecupled right on to the other fellow’s tail. That took head work and complete confidence that the other fellow wouldn’t let them down. And he never did. England’s Wonder Giant Puts to Sea [Continued from page 48] and longtitude of the voyage can be de- termined at will. Up on the bridge are twin steering wheels, geared to dual controls. If one wheel goes dead, the change over to the other is only a matter of seconds. In the diagram on page 48 is shown how the puny power of one man is increased stage by stage until the gigantic rams turn the 140-ton rudder. The rudder has two doors so that the repair crew can enter and make repairs from inside when necessary. “Iron Mike” does most of the sea steering, for this gyro-pilot not only keeps the ship on her course, but makes a perma- nent record of every course steered. It required a quarter of a million crafts- men to provide material for and construct this great ship. Her decorations alone total $2,500,000.00 in cost. Mail is handled by electric hoists and chutes. And when occasion calls, it will be pos- sible for the Queen Mary to arrive in port, disembark passengers, restore, refuel, em- bark passengers and proceed on her next voyage inside of 12 hours. This vast floating hotel is indeed a wonderful ship. 144 Thank You for Mentioning Modern Mechanix Hobbies aud Inventions When Writing to Advertisers

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N N UNIO! weSTENN gD __ new YORE 10 STABLISHING new mileage records on cars in all sec- tions of the country, the Vacu-matic again scores in a new speed record established by Bob McKenzie transcon- tinental automobile champion, Los Angeles to Chicago — 2,322 miles in 39 hours and 42 minutes— driving 75 and 80 to maintain a speed average of 59.7 miles per hour! Here is speed—a gruelling grind—where quick accelaration, greater top speed — and less stops for gasoline mean those precious moments saved that make new speed records possible The same Vacu-matic that helped Bob McKenzie establish this speed record and ‘gave him such fine gas savings is now available for all car owners. It is positively automatic—simple to install—inexpen- sive—and pays for itself many times over in gas savings itsmahéz ++ Nothing Like It! Vacu-matic is entirely different! It operates on the super- charge principle by automatically adding a charge of extra oxygen, drawn free from the outer air, into the heart of the gas mixture. It is entirely AUTOMATIC and allows the motor to “breathe” at the correct time, opening and closing automatically as required, No idl- Agents and ing troubles—no carburetor adjust- Salesmen ments necessary. It is so simple it will amaze you—so practical it will VACU MATIC oien save you many dollars on gas costs. ~a-splendid opportunity for unusual.sales and Fits All Cars profits. Valuable terri- | VACU-MATIC is constructed of six tories now being as- | parts, assembled and fused into one unit, signed, Check and mail | correctly adjusted and sealed at the coupon. factory. Nothing to regulate. Easily attached in ten minutes, The VACU-MATIC Co. Wauwatosa, Wis. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Guaranteed Gas Savings VACU-MATIC must prove itself on every car. It is guaranteed to give worthwhile gas savings, quicker pick-up and more power, or it costs you nothing. “On my V-8 Ford it works miracles”, says Ralph Fields. James Seeley —"On an International Truck on a round trip to Cleve- land, 385 miles, it saved 19 gallons of gas.” A. V. Grove —On the Buick it showed 5 miles more per gallon.” F.. S. Peck—“I average 22 miles per gal. on my Plymouth, an increase of 7 miles, for a saving of $15.00 a month, or $180.00 a year.” Wm. Lyons—‘“Averaged 25 miles on a gal. with a Model A Ford at 40 miles per hour.” Free Details You owe it to yourself to know all about this remarkable discovery. Mail the coupon below. Start saving gas with VACU-MATIC and enjoy a new driving thrill! There’s no obligation—so get the facts now! Write today! == -FREE OFFER COUPON @ = œ q THE VACU-MATIC COMPANY I 7617-207 W. State St, Wauwatosa, Wis. t 1 Gentlemen: Please send me full particulars concerning the § Vacu-matic and details of your Free Offer. This of course a does not obligate me in any way. J Name .essessesasssosnarreseneoossesposensereoaes .... ‘ Po Address ..cssscceeseneeeneeeees sieewieeeeeimeiaseere nas l 1 CRY cites cis 865 viet arimas aeonaeaece: “States sre aroos l O Check here if interested in selling proposition. in =b = w SSS ee eee eee A UŘ M

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Naw) Tcloars that tost Wusinoss. This spraying device, designed for the printing trade, de- posits a thin film of powder over each sheet as it leaves the press. The powder absorbs the fresh ink, preventing smudg- ing and offsetting. No absorbent paper inserts are needed. A man’s wrist watch combines the features of stop watch, telemeter and tachometer in a single, compact unit. A reflector belt for pedestrians is studded with reflector buttons for safety at night. A light plane containing many improvements has recently been announced by a Pittsburgh manufacturer. A latch-string en- velope is opened and contents re- moved by pulling a string. A cigarette dis- penser for cars re- leases a lighted cigarette when button is pressed. A working angle of more than 90 degrees is obtained by this screw driver which works around corners. A depth gauge for 146 `- claimed for it. printers quickly determines the depth of halftone plates. Spark plugs with a U type shell electrode are now being made. Greater spark area and less carbon are An eightinch floor sander with adjustable drum insures fast work and a greater saving in sand paper. An exercising ma- chine mechanical- ly duplicates the benefits of rowing, swimming, bicycling and horseback Aircooled is this light-weight outboard motor. It weighs 2212 pounds and develops 2 horsepower. riding. A hanger rod for bathroom, kitchen, closet, or automobile can be adjusted to any length. No screws are needed, the rod expanding or con- tracting at the twist of an internal screw. A mosquito repellant in the form of a crearan is greaseless, stainless, and pleasantly fragrant. It also repels other insects. A radio receiver features a new tuning dial con- taining all wave bands on the single face. Cover- age from 540 to 18,000 kilocycles is possible. A fly killer electrically vaporizes a new chemical formula which penetrates all corners of the room. The odor is unnoticeable. An air cleaner designed for cars in the dust storm area is reported to have conquered dust trouble as far as motors are concerned. Rubber sealed reflector buttons withstand the abuse of traffic and are not dimmed by moisture. 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 MecuanIx PUBLISHING Co., Information Bureau, Fawcett Building, Green- wich, Connecticut. Manufacturers are invited to submit material. ent eo US. e

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BILL, JUST MAILING THAT Bn TOM GREEN WENT COUPON GAVE ME A QUICK INTO RADIO ANO HE'S i START To SUCCESS IN RADIO. MAKING GOOD MONEY, MAIL THIS ONE TONIGHT

was tickep-THEN A TL MY RAISE DIDN'T COME THROUGH ' MARY-~-I MIGHT AS WELL GIVE UP, IT ALL LOOKS SO HOPELESS. IT ISN'T HOPELESS EITHER BILL. WHY DON'T YOU TRY A NEW FIELD LIKE RADIO?

YOU SURE KNOW (THATS $15 i've RADIO- MY SET ( MADE THIS WEEK NEVER SOUNDED eo IN SPARE TIME

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 TRAINING FOR RADIO IS EASY AND GETTING ALONG FAST-- | can GET A JOB SERVICING sete _

A THERE'S NO END TO THE “8 sy, GOOD JOBS FOR THE Sire TRAINED RADIO MAN

N.R.I. TRAINING CERTAINLY PAYS. OUR MONEY WORRIES ARE OVER AND WE'VE A BRIGHT FUTURE AHEAD IN RADIO. OH BILL, IT'S WONDERFUL YOU'VE GONE AHEAD $0 FAST IN RADIO.

I'LL TRAIN YOU AT HOME In Your Spare Time For A GOOD RADIO JOB MAIL THE COUPON NOW. Get the facts about Radio—the field with a future. N. R. I. Training fits you for jobs in con- nection with the manufacture, sale a operation of Radio equipment. It fits you to go in business for yourself, service sets, operate on board ships, in broadcasting, television, avia- tion, police Radio and many other opportunities. My FREE book tells how I train you quickly at home in spare time to be a Radio Expert. Many Radio Experts Make $30, $50, $75 a Week y Why struggle along in a dull job with low pay and no future? ka E R Start training now for the live-wire Radio field. I have heiped many men make more money. Hundreds of successful men now that my training pays in Radio got their start through N. R. I. Training, 1 Many Make $5, $10, $15 a Week Extra J. E. SMITH, President j in Spare Time While Learning National Radio Institute Hold your job. I'll not only train you in a few hours of your The man who has di- spare time a week, but the day you enroll I start sending you rected the Home Study Extra Money Job Sheets which quickly show you how to do Training of more men tadio repair jobs common in most every neighborhood. I give for the Radio industry you Radio Equipment for conducting experiments and making than any other man in tests that teach you to build and service practically every type A 7 re of receiving set made. Otis Denton, 14105 Lorain Ave., Cleve- AMerica. Gets Job While Makes More Money Than land, Ohio, writes: “I picked up $1800 while studying. The Training Ever Before time I gave my Radio work did not interfere with my other “Before finishing your “I am making more business.’ Course I was Radio money now than I have P i Expert for the largest ever made. My gross Find Out What Radio Offers sporting goods store in income in cash one My book has shown kundreds of fellows how to make more money North Carolina. Sinee month was over $500 and win success. It's FREE to any ambitious fellow over 15 enrolling I have made and I also did a eredit years of age, Investigate. Find out what adio offers you. about $8,500. I want business which ran Read what my graduates are doing and makin about my Money to thank N. R. I.’— something over $200. Back Agreement, and the many other N. R. I. features. Mail J. F. Huff, 601 W. Any time I can speak a the coupon in an envelope or paste it on a le post card TODAY. ISth St., Austin, Texas. good word for N. R. I

I will be glad to do J. E. SMITH, President, Dept. 6GH it."—Otis K. Wolfe, National Radio Institute, Washington, D. C. Harlan, Ky. X wi il _ ee J. E. SMITH, President, Dept. GGH . National Radio Institute, Washington, D. C. | d h Dear Mr. Smith: Without obligating me, send your book which points out the spare time and full time job opportunities in Radio and your 50-50 method of training men at home in spare time to become Radio Experts. (Please write plainly) l N. R. I. Course Pays for Itself = “At the end of my first year I more than tripled

the cost of my Course. NAME gesam dup dey Aaa E Eai EE EEE AE NLS ANSI AGE cenrriiiria ] Other fellows need not be A fraid to start the Course ADDRESS gioii tratara ane EEETETETETEET peaeees Pee eneeneueene ec arts ] for fear they cannot pay for it, because it more DITI renovi Yeap egress as ANNES NAE Aamir deme + SPATE socesh ease than pays for teeta F: E, anderson r. < À z Moyock, E C. ’ . (If you do not want to cut this cover simply write us on a post card)

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ONLY SILVERTOWNS GIVE YOU GOLDEN PLY @420-erc7 PROTECTION Put yourself in this picture. Don’ triska blow-out accident like this. Unless you are pro- tected, the chances are better than even you will have a blow-out some day. *% E When thousands are killed or injured in blow-out accidents every year isn’t it foolish to take unnecessaty chances? Even at normal speeds of 30 or 40 miles an hour, terrific heat is generated znside the tire. Rub- ber and fabric pull apart. A blister forms and grows bigger and bigger until—sooner or later—BANG! A blow-out! To protect you, the Life-Saver Golden Ply is built into every new Goodrich Safety Silver- town. This ply has a special heat-resisting construction de- veloped by Goodrich engineers to keep blisters from forming and overcomes the great, unseen cause of high-speed blow-outs. Have your Goodrich dealer equip your car with a set of Golden Ply Silvertowns. They’! give you greater safety and months of extra trouble-free mileage. Yet they cost no more than other standard tires. HEAT CAUSES BLOW-OUTS. PREVENT THOSE BLOW-OUTS WITH THIS HEAT-RESISTING GOLDEN PLY FREE Į Join the Silvertown a Safety League. Sign the Safe Driving Pledge and your Goodrich dealer will get for you absolutely free a tail- light emblem with red crystal reflector. No obligation to buy. he Goodrich SAFETY Silvertown With Life-Saver Golden Ply Blow-Out Protection

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uble Page Spreads

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A frank man to man talk about PATENTS-INVENTIONS -SELLING INVENTIONS HE world of invention moves on. The Patent Office clerk who resigned his job back in 1833, because he said there was noth- ing left to invent, now stands out as one of the funniest men in American History. Think of everything that’s happened in the last 100 years! Why, only recently the papers carried a notice that an obscure worker, Hans Wach, has invented a simple device to utilize exhaust steam on steam boats. Already, the report states, the steam ship lines have saved more than $15,000,000 in fuel bills with his invention. Almost ia the same breath the Dept. of Commerce announces that it will soon test out a new non-crashabie aeroplane, which the average man can learn to fly in a day, which will travel at 110 miles an hour and sell at the price of a cheap automobile. An unknown Seattle man has invented a robot to go 5,000 feet under the sea and recover millions and millions of dellars worth of gold lying at the bottom of the ocean since the days of the early Spaniards. Remember this: For every outstanding big inven- tion there are thousa-ds of small, simple things for use in the home, the office, the factory, on the farm, on every sort of travel conveyance. Little articles like you find on the counters of a 10-cent stores hardware store, drug store, toy and novelty shop. Many Little Ideas Have Big Commercial Possibilities A person finds something he’s using doesn’t work right, or it’s clumsy, or costs too much. He gets a happy thought. He improves the old Article. That’s contribution to human progress, That’s the way that many, many men have reached the goal of financial comfort, independence and even wealth, Most of the things millions of us use didn’t come from the brains of engineers and physicists, They came from the mind and maybe the crude home work bench of Mr. Average Man, busily engaged in earning his bread and butter at what- ever chance or circumstance has given him to do. The “little” man’s opportunity as an inventor was never greater than it is today. Who Are Inventors? You'd be amazed at the men we con- taet in the course of a busy year. Most of them do not consider themselves inventors at all. During their work ov leisure they get an idea. They work it out on paper. They get in touch with us about Protection, Did you know that a dentist invented the stock ticker, a school teacher the telephone, a farmer the typewriter, an artist the telegraph? Did you know that ‘the crinkly hair pin—sold by millions now—came about because a husband saw his wife twisting the old-fashioned straight hair pin to make it stay in place? Poor men who have no thought of invention now will be financially well-fixed in a few years because of a happy thought that the world could use to advantage. Can You Answer These Questions? Ask yourself these questions: How do the Patent Laws protect me? What easy steps can I take, without cost, to put myself in position to support. my belief that I am the first man to think of my invention? Is a Patent worth the cost? Do I need a model? Should I try to sell my invention before I have it Patented? Is there any safe, business-like way to secure financial help? Jf I do apply for a Patent how shall I reach people who can market my invention? Can I protect and sell an improvement on some invention that has alveady been patented? These are but a few of the questions which usually confront the average man. You need the answers! YOU CAN HAVE THEM, without cost, trouble, or delay. Copyright 1936 Victor J. Evans & Co. Our Business Is To Help You. Write Us Today For more than thirty-six years, this firm bas been helping men with an inventive turn of mind. We maintain a large staff of trained, experienced specialists—Registered Patent Attorneys, Draftsmen, and Searchers to help our clients secure all the protection to whith they are entitled. Fees are reasonable. De- ferred payments frequently arranged. Ques- lions promptly answered. Write us frankly with absolute assurance that what you say will he treated with strictest secrecy. But FIRST, send for the FREE BOOKS shown on the ope posite page. They are filled with facts, pic- tures and suggestions. They tell you things about Patents, Inventions and Selling Inven- tions that we have learned in our long experience. They may save you time, expense, EVEN LATER DISAPPOINTMENT. Simply fill in the coupon. No charge, no obligation. Write us today. WASHINGTO 6 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Thank You for Mentioning 115 Mechanical Move- ments Like These FREE = BOOKS with 68 PAGES of Facts and Pictures! Besides many other features and facts there are 115 differ- ent mechanical movements and Principles in the big, 48-page Book below. Maybe there is just the idea you need to solve some mechanical problem. Use the coupon or write us a card or letter, REGISTERED PATENT ATTORNEYS, MAIN OFFICE: 720-H, VICTOR BUILDING, WASHINGTON, D. Other Offices: 100 14 CTOR , Monadnock Bldg., Chicago Empire Bldg., Pittsburgh 1010-N, Hobart Bldg., San Francisco Security Bldg., Los Angeles I Send me FREE copies of your books, “Patent Protection” and “When and How to Sell an Invention.” (Note; Sume books supplied by any of branch offices listed abore.) Mame sesave + Street and No. City or Town Modern Mechanix Hobbies and Inventions When Writing to Advertisers bd

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DELAYS ARE DANGEROUS IN The Free Book shown here PATENT MATTERS was prepared for inventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for ttis book AT ONCE. It will tell you exactly how an application for a Patent is made, what informa- tion you must furnish your attorney, and what steps he must take in order to protect your interests. Remember, inventing an article ies is one thing—securing the exclusive right to manufacture it, use it or sell it is another. Without a U. S. Patent, you cannot expect to reap the profits that your invention may make possible. Send at once for this book. After you get that, you'll know exactly what to do to protect yourself. WE SERVE YOU QUICKLY and SECRETLY Anything you write us or send us is strictly confi- dential between us. All letters and drawings are kept in strong, steel, fireproof files, which are open only to ourselves or authorized members of our staff. We have secured patents for inventors located in every state in the Union. Our organization is a large and efficient one, Our practice is confined en- tirely to Patents, Trade-Marks and Copyrights. We have had vears of experience in Patent Matters. When you place vour idea in our hands, we are in position to proceed at once to secure protection for you, Our fees are reasonable, and, if you desire, we can arrange convenient terms of payment. IMPORTANT! Please understand that you are not under the slightest obligation in sending for this book. We will mail it, together with the Record of Invention form, the same day we receive your request. Use the coupon on next page to save yourself time and trouble. After that, you will be in position to pro- ceed or not as you choose, to make your application for a patent. CLARENCE A. O’BRIEN & HYMAN BERMAN 317-H Adams Building Washington, D. C. REGISTERED PATENT ATTORNEYS BEFORE U. S. PATENT OFFICE Smail Ideas May Have Large Com- mercial Possib Ideas do not have to be complicated to be profitable when Patented. The 5c and 10c stores flourish on simple Pat- ented products which are commercially successful, The zipper, safety pin, thumb tack, paper clip, collar button— all are simple yet familiar inventions— brought their inventors rich rewards! If you have a Patentable idea—act to protect it. Send for our FREE 48-Page Book that tells you how. A partial view of our draft- ing and specification offices © where a large staff of ex- perienced experts is in our constant employ. 10 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers RECORD OF INVENTION BLANK We will send you our Record of Invention form FREE. This blank will enable you to make a sketch of your idea in proper form and have it witnessed in such manner that it may be of value to you as evidence should the oceasion for evidence arise. In our book, we tell you how to use this form to protect your in- terests. YOU CAN PATENT NEW IDEAS FOR IMPROVE- MENTS IN MACHINERY, ARTICLES, DESIGNS, FORMULAS, ETC. Every year thousands of Patents are granted. Very few, however, represent the discovery of en- tirely new principles. Most of them provide new methods of doing some everyday thing in a better way—changes for greater efficiency, usefulness, adaptabil- itv, or beauty in some previously Patented thing. These IM- PROVEMENTS are Patentable if new, and actually represent new invention. These improve- ment Patents offer large chances for profit if commercially useful. The business world wants im- proved products and services. QURLOCATIONIN WASHINGTON Our offices in Washington are convenient to the Patent Office, and we and our assistants can, therefore, appear promptly re the officials and Examiners, REASONABLE FEES AND CONVENIENT TERMS We have served thousands of inventors in all parts of the United States and we are able to serve you very reasonably and ex- tend liberal terms of payment. So don’t waste valuable time. AND THIS BOOK TELLS HOW! How your Patent Application is made; what kind of sketches or drawings are necessary; what other papers must he made out; how the Patent Laws pro- tect you; why it is important to avoid loss of time in getting your applica- tion filed; and many other important points, Even a very simple idea, if new and useful, may prove very value able. You may have much to gain and nothing to lose by sending for this book TODAY. CLARENCE A.O BRIEN € Hyman Berman 317-H Adams Building WASHINGTON, D.C. REGISTERED PATENT ATTORNEYS BEFORE U.S PATENT OFFICE Please send me your FREE BOOK, “Patent Guide for the Inventor” and your “Record of Invention” form, without any cost or obligation on my part. i |! | NAME ADDRESS (Important Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 11

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Karlong AT the Indianapolis Clas- sic is to auto racing and the Kentucky Derby is to horse racing, so the Soap Box Derby is to every youthful driver who has ever piloted a four-wheeled push-mobile down the biggest hill in the neighborhood. These free-wheeling chariots have got Soap Box racers invade MM Boat fans show in- genuity. Midget car builders report success. Editor issues call for pho- tographs. Distant coun- tries are heard from. Chijesfuong tg the second prize of $3 in our monthly Editor’s Workbench Contest. He writes: San Carlos, Cai, Dear Editor: I am sending you a picture of the kyack my friend and myself built. We had great fun building it from plans we found in the first edition of a certain zip and dash to them that none of the big cars seem to-have, and for that reason the Soap Box Derby is fast becoming a national institution, just like the Classic and the Derby. Now that vacation time is here again, it seems that most of the boys in the country are out building their racing soap boxes or hunting for plans to go by. MM is on hand to co-operate with all the builders. Not only are we running a big feature in this issue on all the mechanical details which go into a racer, but we are giving away two complete Soap Box racers and a set of balloon tired wheels as prizes in a new contest. You will find the details on Page 54, This brings us right up to our own workbench contest. This time the first prize of $5 goes to Don Weisbard of Hollywood, Cal. Don decided to use the experience he had gained as a soap box engineer to build a midget automobile. That he was successful can be judged from the photo which appears on this page. His letter follows: Hollywood, Cal. Dear Editor: Enclosed herewith is a photo of a midget car powered with a one-lung, two-cycle motorcycle engine. I built it myself from scrap materials. It has a five foot wheel base, is seven feet long and thirty inches high. It has a iow and high gear, a plate clutch and chain drive. She will do about 88 miles per hour when wide open. I found that aluminum disk wheels were necessary in the rear as the spoke wheels can’t take it when the power is applied. The spoke wheels work fine, however, in front. The little model next to it (in the photograph) is de- signed from a midget auto racer and is only ten inches long. It has an all-metal body, dummy engine, steering device, etc, I expect to have it chromium plated. Don Weisbard. PEPI Our boat building fans were present in even increasing numbers this month, One of them, Ed Olson of San Carlos, Cal, walked off with 20 “How To Build 20 Boats.” Alter a great deal of thought and study, the plans were changed to hold two people instead of one. It has carried 340 pounds easily. I do not dislike any article in good old MM. Ed Olson. We have some good news for many of our readers in regard to our first edition of How To Build 20 Boats. After turning down orders right and left for nearly a year because we thought the edition was out of stock, Jimmie, the stock boy, reports that he found about 200 copies while moving the MM files to new quarters. You can get your copy of the first edition of How To Build 20 Boats now, if you hurry, by sending fifty cents to this office. The second edition is also in stock. Be sure to specify which edition you want. iok One of our Paragraph Oddities in a recent issue concerning the custom of driving to right or left in Austria brought an interesting letter from one of our British readers. He has driven all over Europe and he says, quoting parts of his letter: As neat a job as we have seen in this office for some time is this midget racer built by Don Weisbard. Note the model beside it. Don wins the first prize of $5 for this month. Modern Mechanix Hobbies & Editori Workbench Eggar’s Hill, Aldershot, England Dear Editor: Having read the paragraph in a recent edition of your excellent magazine, I thought I might be able to enumerate a few other points of interest about driving an automobile in Europe. Most countries in Europe have their own special laws, confusing to the foreigner, For instance, in Czecho-Slovakia it is an offense to smoke while driv- ing. In Germany one must not carry any red lights on the car. most of the tail lamps are orange. On the mountain roads in Switzerland some of the roads are very steep and narrow. A one-way traffic system is in operalion, cars going up at one time, and down at another. Mail trucks ure painted yellow, and the motorist must always pass these trucks on the precipice side of the road so that whatever may befall, it will not be the mail truck which goes over the cliff, In France the small villages have open drainage systems carried across the main road by a trench about two feet wide and one foot deep. These ditches are very dangerous, being quite invisible in the cobbled streets. In Yugo-Slavia cars are very rare and there are few roads, Needless to say there are no garages and petrol is bought at the local chemists for about a dollar a gallon. In Monaco, the small state containing Monte Carlo, one’s speed must never exceed 9 miles per hour under normal circumstances, and a walking pace in dangerous places, Failure to comply often entails confiscation of one’s automobile. In Holland heavy motorcars must have a deep noted horn, and a light car or motorcycle a high pitched one. I hope these points may be of in- terest to you. Arthur Garratt. LEE The third prize of $2 this month goes to Gordon Chris- tiansen for his boy-powered steam shovel. Here is what he says about it: Ryder, N. Dak. Dear Editor: I am enclosing a snapshot of the boy-powered steam shovel built from plans in the April, 1935, issue of MM. (Also included in the 1936 ‘How To Build It” Book). I built it as a present for my brother. It is surprising how well it works. The things it can do far exceed what 1 expected of it. The articles I least enjoy in MM are magic tricks for the amateur, but as a whole I like most all of the articles. I miss one page that used io be in the magazine called “Auto Generator Kinks.” Long live MM Magazine. I think it is a great book? Gordon Christiansen. Right now we want to regis- ter a complaint against you. Yes, you—the reader! You are too modest. While you are all willing to send us all kinds of kyack plans. Inventions, July, 1936 Here is an enlarged version of MM’s Passengers instead of one by Olson. He wins the second prize of $3 in the monthly Workbench contest. Thus This boy-powered scoop shovel, built from MM plans as, a present for his brother, wins for Gordon Christiansen the third prize of $2. photos, few of them are clear enough for publica- tion. If you want to win prizes in the Workbench’s monthly contest, take a little time to get good photographs of the things you are building. Don't shoot snaps of the project itself. Put yourself in the picture or let a friend pose for you. We need pictures but they must be good pictures. And don’t forget one of the requirements of each month’s contest is, you must state which article or department you liked best, and which least. gO Another midget car builder writes in to say: Mauch Chunk, Pa. Dear Editor: T have just built a midget car during my spare time. She does the one-filth mile in 12 seconds and holds the road like a Cord. She is a front-drive 4-wheel brake job driven by a motorcycle engine. Makes thirty miles to the gallon and weighs 1,150 pounds. Uses 20x4 tires mounted on 12-inch wire wheels. Quali- fies under all midget racing classifica- tions. I will answer any questions con- cerning car if readers will ask me. William Miller. wok Here is a letter from a fan who believes in putting his workshop and MM to work. He makes it a point to keep all his MM copies on file where they can be located as needed. That it is a good policy you all will agree when you read Ed his letter. It was built for two [Continued on page 22]

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Lhe NATION Sizs in onNationalConventions by BOB GORDON o Politics becomes mechani- cally minded in 1936, and both Republicans and Democrats are providing the machinery which will permit the nation to listen in to the proceedings. ~ The nation, in the form of radios, news reels and newspapers, will have the chosen seats at the Democratic Convention in the A Philadelphia Auditorium. Above is shown seating arrangement. Left—The Cleveland Auditorium into which will parade 997 Republican delegates; 1,116 alternates. will be the operator who will control the radio and newsreel microphones and the public ad- Circle, above—Gov. Pollard of Virginia proposes a resolution at a National Convention. Note directional micro- phone behind him and broadcasting microphones before him. HE political machinery for nominating the presidential candidates of the two major parties remains as old as the parties, but in June this year the entire nation will be given ringside seats at the National Con- ventions at Philadelphia and Cleveland, with both parties taking advantage of every latest scientific wrinkle to bring the conventions to your home or local movie. In stadiums, ball parks and town squares loud speaker systems will be set up for the hundreds of thousands of persons who will assemble on the evening of June 27 to hear President Roosevelt accept the Democratic nomination. Republicans, too, are planning on having their candidate broadcast his ac- ceptance of the nomination from their con- vention hall. More than six thousand persons will journey to the convention cities to select the 28 the Democrats at - Philadelphia and the Republicans at Cleveland. Millions will listen by radio to the proceedings. - men for whom you will vote this fall. There will be 1,200 delegates at the Democratic Convention in Philadelphia, with 1,700 alter- nates, while the Republicans at Cleveland will have 997 delegates and 1,116 alternates. Then there will be the 106 National Commit- teemen of each party, more than 1,000 re- porters, and several hundred telegraph, radio, newsreel men and news photographers. The voting delegates will be seated in the front of the hall in four gigantic banks of seats. Delegations from each state will be seated together, with huge signs designating the seats. The alternates will have chairs Modern Mechanix Hobbies & Wild demonstrations accompanied the nomination of Franklin D. Roosevelt, Democrat, for the presidency in 1932. All state delegates, bearing placards, paraded past the speaker’s table. on the auditorium floor directly behind the delegates. Aisles between the banks of seats will be especially wide. The speakers’ stand will be an elevated platform erected on the front center of the stage. On this platform will be the Chair- man of the Convention and the principal speakers for the day. On this platform also ‘Inventions, July, 1936 dress system through a maze of 53 switches. From a technical point of view, this switch- board operator will be the most important man in the convention hall, for he will have complete control of all sound effects. It will be he who will, under the direction of the Convention Chairman, sort out the correct speeches from the bedlam created by a thou- sand men all anxious to talk at once, and to see that the voice of only the speaker recog- nized by the chair is amplified on the public address system, is broadcast to the nation over the three networks, and is recorded by the newsreel camermen. On the rostrum of the speakers’ platform. will be the three microphones of the broad- casting companies. The voice of the regular speakers will be carried directly to the sound- proof studios erected over the back of the stage, and from there, over telephone lines, will be carried to the hundreds of broadcast- ing stations on the networks. The five news- reel companies will also have microphones here connected directly with recording ap- [Continued on page 129] 29

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1909 INITIAL SUCCESS / ft BLERIOT CROSSES THE ENGLISH CHANNEL AND FIRST MASS PRODUCTION OF RADIAL TYPE ENGINES RESULTS WHEN 400 OF THESE TINY BLERIO” TYPE XI MONOPLANES “GROSS-CHANNEL" MODEL. POWERED WITH 27H.P AIR-COOLED ANZANI ENGINES ARE ORDERED WITHIN THE SAME HISTORIC YEAR. Bijen, 1909 -1912 PROGRESS / ROBERT ESNAULT -PELTRIE -BRILLIANT FRENCH AERONAUTICAL ENGINEER AND EARLY EXPONENT OF STEEL TUBE CONSTRUCTION INTRODUCES THE "FAN" TYPE RADIAL, AND LIKE BREGUET (CONTEMPORARY AND OF EQUAL FAME), PRO- DUCES A SERIES OF PLANES POWERED EXCLUSIVELY WITH RADIALS NOTE STACGERED CYLINDER ARRANGEMENT REDUCTION GEAR FOR PROPELLER DISTRIBUTOR OIL SUMP CUTSAWAY VIEW OF TYPICAL TWO-ROW MULTI-CYLINDER RADIAL: AIRPLANE ENGINE This particular engine has a reduction gear to the propeller shaft. Note the overall length of the motor. Bileriot’s first flight across the English Channel gave the radial air engine its first impetus. The immediate result of his venture was the sale of hundreds of the Type XI or Cross-Channel model. Equipped with three-cylinder, air-cooled Anzani radials, these little ships were soon flying all over the world. The light rotary radial followed and persisted until after the World War. By 1920, there was a swing to “in line” and “V” engines. 32 Three stages in are shown. The Canton-Unne, an air-cooled engine used on the Breguet, per- sisted until dis- placed by the Gnome and other rotary radials. THE EFFICIENT BREGUET BIPLANES OF THIS PERIOD OFTEN gf MOUNTED WATER- COOLED RADIALS IN THE MANNER SHOWN DRIVING PROP. THRU BEVELGEARS IWENTY-SIX Twin Wasp engines of 1,000 horsepower will begin service in July on air liners as. the latest triumph in radial engine design. A far ery from the three-cylinder radial motor which bore Louis, Bleriot over the English Channel in 1909, the new engines are described as the mightiest yet built for regu- lar service. The new air-cooled engine is the 1,830 Wasp of Pratt & Whitney. The 14 cylinders are in two circles, one behind the other. Normal power maximum is 1,000 h.p. with an emergency maximum of 1,150 h.p. Weighing 1,250 lbs., the motor develops, at sea level, a horsepower for each 1.09 Ibs. It will enable the Douglas DC-3’s of the United Airlines to cruise at over 200 miles per hour and to fly non-stop from San Fran- cisco to Salt Lake, Salt Lake to Chicago, and Modern Mechanix Hobbies & 1910 -1918 THE ROTARY RADIAL ENGINE ERA .~ THE GNOMEROTARY TYPE RADIALS REVOLUTIONIZE AIRPLANE PERFORMANCE, AND PROFOUNDLY IN- FLUENCE AIRPLANE DESIGN THROUGH- OUT THE WORLD. - THE 1913 SOPWITH pe (80H.P. GNOME) DE- PICTED HERE IS THE DIRECT ANCESTOR nl” ~ FIRST NON-STOP FLIGHT BETWEEN NEW YORK AND PARIS LINDBERGH, IN WRIGHT- (RADIAL) Ww POWERED MONOPLANE WRITES A NEW PAGE IN HISTORY AND CON- CLUSIVELY DEMONSTRATES THE SUPERIORITY OF AMERICAN RADIALS Until shortly be- fore the flight of Lindbergh to Paris, rotary radials were in use. It was a troublesome type of motor and yielded to static designs after only a few years. ee 1935 HOWARD HUGHES BREAKS WORLD'S SPEED RECORD FOR LAND PLANES WHEN HIS RADIAL-POWERED RACER ATTAINS 382 M.P.H. Topay/ sas THE DOUGLAS Ds-3 = WORLD'S NEWEST AIR- LINER-IS POWERED WITH THE LATEST TWO-ROW RADIALS Chicago to New York. The Navy has ordered 200 of the engines for combat and patrol planes and is barring their export. At its first public demonstration in East Hartford, Conn., the new engine took up a two-year-old Vought Corsair with a run of only 150 feet. After banking once, Pilot H. H. Sargent sped by observers at 225 m.p.h. Witnesses said the roar of the engine was the deepest in their experience. “The time has come when the single row radial air-cooled engine in large transport operation is as obsolete as the four-cylinder automobile engine,” said Charles W. Deeds, This is the new 1830 Wasp. Smoother operation and longer Pratt & Whitney general manager. The new engine is the result of experimen- tation which began in 1929 when Pratt & Whitney engineers became convinced that the economical power limit of the normal nine- cylinder radial engine had been reached. Inventions, July, 1936 life as well as tremendous power are claimed for the 14- cylinder two row design. There are 250 light impulses per second from a 52-inch cylinder at cruising horsepower. The combination of high crankspeeds with comparatively small cylinders permits a greater mean effective pressure with any given fuel. More power for a given displacement can be. obtained. Automatic valve gear lubrication and mixture con- trol and 21,000 square inches of cooling surface are features. 33

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LIGHTING THE WAY FOR COLOR MOVIES The naturalness of color movies is largely dependent upon great quanti- ties of light. This “broad” arc light serves for general illumination. About twenty-five lights such as this are needed for each color scene. EHIND the fascinating natural color mo- tion pictures that are sweeping the country there lies a story of astonishing de- velopments as spectacular in their field as the color movies themselves. Let’s visit the huge Stage 8 at United Artists where Pioneer Productions filmed a dance sequence for “Dancing Pirate,” and observe the new mechanical equip- ment and new technique being employed in order to bring a color film to the screen that has coloring as vivid as nature her- self. Because everyone, even in Hollywood, is interested and curious about the equipment and methods employed in making color pro- ductions, a uniformed guard at the stage door stops the curious. Even the employees and actors of the studio who are working on other films would “gang-up” on the color setting and interfere with the work. The first thing noticed that is different from the setting of black and white movie is the great number of lights used. Lighting equip- ment or “rigging” of great variety is every- where. Overhead is a solid bank of “broads” which are used for the “filler” or overall illumination. High up on the “parallels,” sixty feet up in the roof on the “catwalks,” everywhere, on the top the setting and on the floor is lighting paraphernalia used for the special effects and for painting the desired scene. Two or three times more light is re- 36 Charles Collins and Steffi Duna in an action scene for “Dancing Pirates”, the latest indoor color film. Note the lights at top of set. Each one of which emits more than 250,000,000 candlepower. Robert Jones, left, and Lloyd Corrigan, center, are the two men to whom credit must go for the success of ‘Dancing Pirates”. Jones is color designer, and Corrigan the director. quired in making a movie in color than one in black and white. A new type of arc unit, called the “high- arc” has been developed for ‘‘Dancing Pirate” which emits 325,000,000 candlepower in a narrow beam. In order to illustrate the amount of heat given off, this are, which draws 150 amps, if focussed to a narrow beam is capable of almost instantaneously setting a block of wood ablaze at a distance of Modern Mechanix Hobbies & by EARL THIESEN Fascinating as the miracle of color is upon the screen, it proves even more fascinating when one steps “behind the scenes”. The new, novel equipment in use, the lights, and the cameras are fully described in this exclusive article. In this “behind the scenes” photo of a color movie in the making one can see how the lights are arranged to shine with extta brilliance upon the gallows in the center. This immedi- ately but unnoticeably attracts the eye to the center of action. twenty feet. Twenty-two of these powerful lights, besides fifty-six units of less capacity, were set up for the dance sequence. Ac- cording to measurements, 16,000 amps were required for a daylight effect on this set- ting, or enough electricity to light an or- dinary town of 10,000 or more inhabitants. It is enough power to illuminate several metropolitan city blocks with all the street signs and office lights. Eight to ten thou- sand amps, we are told by the “gaffer,” the movie name for the electrician, were re- quired on the same setting for a moonlight effect. With the older type of “sun-are” light used in earlier color pictures the eyes of the actors were fatigued and strained and gave what is known in the studios as “kleig-eyes,” because of the presence of ultra-violet light. Inventions, July, 1936 From a “parallel” above the set the camera- man and his crew shoot a high” scene. The microphone in the cameraman’s hand is for broadcasting instructions during rehearsals. THREE NEGATIVE MAGAZINE FINDER DEFLECTOR $ SWIVEL MOUNT, Here is a front view of the three-color Technicolor camera. In the magazine are three negatives side by side. One nega- tive records red-orange, another blue-green, the third, yellow. A prism behind the single lens divides light rays into colors. Now, on the new type “high-are” a special glass filter which contains a metallic salt is used over the front of the light unit which absorbs the ultra-violet. This glass is also framed so it won’t break from the heat and drop on the players, while the arc mechanism itself has a metallic insulator of cooling flanges which radiate off the heat. A new lens, the “Morine,” is used on some 37

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Count Byron de Pro. rok (above), Europe’s Roy Chapman An- drews, who found the lost gold mines’ of mighty King Solomon. Below—One of the un- told thousands of dus- ky slaves who wash raw nuggets from the gold-ladened subter- ranean streams which flow under the almost extinct volcano. Le One of the many tombs (above) of the long-dead consorts to Kings. Right— An actual sketch made by De Prorok showing the mines -as they are today. | FOUND — King Solomon’s THE SECRET OF WAR-TORN OUNT BYRON DE PROROK, famous explorer, is again back in the United States after a series of adventures that would make an Arabian Nights fable seem weak and colorless in comparison. He was successful in locating the exact spot where the legen- dary King Solomon of Biblical fame once mined fabulous tons of gold. More important, and perhaps the reason for the Italian hosts pushing their way into Ethiopia, these ancient mines are being worked today on a scale that staggers the imagination. From a voleanic mountain top, de Prorok beheld countless slaves, both men and women, toiling night and day to uncover the heavy golden nuggets. But let this distinguished archaeologist tell his own almost unbelievable story: In the course of my numerous explorations in the interests of archaeology, I have found many ancient tombs and lost cities in Africa. Now I hoped to fulfill one of the major objec- tives of my career, the discovery of the origi- nal mines which supplied the fabulously wealthy monarchs of ancient times: Tut, Hannibal, Cleopatra, Alexander the Great, Solomon and the Queen of Sheba, with the vast supply of golden ornaments which made them famous. A For more than 15 years I have crisscrossed Africa’s ancient caravan trails between Car- thage and Utica, and from the Atlas to the Blue Nile in search of the origin of this lost gold. But without success. However, I had Modern Mechanix Hobbies & Gold MINES ETHIOPIA by JAMES NEVIN MILLER located many valuable clues, some of them passed down from generation to generation, others mere whispers gleaned from adven- turers who had been foolhardy enough ‘to penetrate into these mysterious interiors and later lose their lives. These clues convinced me that all trails led into the “back door” of Ethiopia, a remote western desert region ruled over by Solomon Ghogoli, a sultan who admits the supremacy of only one other ruler, Haile Selassie. But an unforeseen difficulty presented itself: In order to penetrate the land of mystery we positively must have Haile Selassie’s official _ permission, and in writing. Otherwise we would be certain victims of Sultan Ghogoli’s murderous warriors. This was just before the Italo-Ethiopian war began. But even then Selassie must have foreseen the conflict because he was at that time so much occupied with military affairs that we found it next to impossible to see him. But finally, after endless formalities and dip- lomatic action, the Emperor gave us the first permission ever given to white men to explore the forbidden land of the Blue Nile. After receiving the first official permit to cross the closed area of the British Sudan we reached Kumuk from Kaston by following the jungle-enclosed banks of the Blue Nile to where Selassie had promised us a military escort of 120. But at the desolate barrier we waited in vain. Inventions, July, 1936 Deep in a smol- dering volcano, dusky slaves still toil in the fabu- lously rich mines of Biblical days. Are they the reason behind Italy’s Ethiopian war campaign? Their forefathers slaves to Cleopatra, today’s Abyssinian “customs” men are really brig- ands. And Count de Prorok (mounted) is having border trouble, with his interpreter in loud and heated debate.

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Right here we made the mistake that almost cost us our lives. We decided to penetrate the interior in the hopes of meeting the escort there. This would have been a wise pro- cedure if we had been properly supplied with official passports from the Emperor. Unfor- tunately the soldiers who were to bring them failed to show up, and we were so impatient to be on the move that we proceeded any- way. So we headed straight for the Old Man of the Mountain, dread Solomon Ghogoli, Sultan of the Shangul. He was over 100 years old, maintained many wives and was, it was rumored, the owner of secret gold mines which no white man had ever seen. Never was he known to permit a European or American to visit his vast, savage realm. For three terrible days we trekked across the enormous canyons and great mountains of this legendary land. Eyen in the shade our thermometers registered from 140 to 160 degrees Fahrenheit, so much greater than the heat of the human body that we were actually able to cool our hands by clamping them under our armpits. The merciless heat once reached 167 degrees, three-fourths as hot as . boiling water. Our porters were terror-stricken. They were fearful of being caught and killed by the savage sultan. No wonder many of them deserted. On the fourth day we made a fantastic dis- covery. While daytime camping in a jungle 42 Through Country Forbidden to Hated White Men De Prorok's party (left) have just been captured by Ghogoli’s emissaries when the Count’s cam- eramen took this shot, another of the exclusive pictures you see here. De Prorok is second from the extreme left, the man with the beard. When mad savages scrutinize you in this fashion, it is a. question of keeping your-head-or losing it. When the seasoned adventurer goes on safari, physical com- forts are discarded, as shown by De Prorok’s tent and personal necessities. But even these were dropped at the mines so that the porters could trek back with museum pieces. SOAGE This picture shows Sultan Ghogoli’s warriors taking the Count into camp with the intention of holding him for ransom, making him a slave, or murdering him and salvaging his head. with my companions I suggested we climb a great mountain about two miles from our camp. We did so and found its approximate center was the huge crater of a smoldering voleano. Aided by powerful binoculars from the heights on the far side we saw, a thousand feet below, a weird sight: untold thousands of black slaves, both men and women, work- ing feverishly in the subterranean river bed. Modern Mechanix Hobbies & Smoking Volcano Hides King Solomon's Mines Amazed, I asked our guide, Diressa, “What on earth are they doing?” He warned “Come away, master! They are Ghogoli’s slaves, washing out gold,” The sight excited us, and soon we tumbled and slid down there. For the skeptical minded, let me add that our movie cameras took in the entire astounding spectacle. Some of those nuggets were as big as a man’s fist. While the cameras were grinding away, my fellow scientists and I explored the rocks of the nearest canyons and found ancient hiero- glyphics and rock drawings on the entrances of many of the abandoned mine shafts. Our excitement knew no bounds. By purest chance we had achieved the major objective of our expedition. Think of it! We had found the precise spot where King Solo- mon of Biblical fame mined the gold that provided his court with unparalleled luxu- ries! Was there much gold here? There must have been untold tons of it, and the precious metal was being panned in the same crude way as practiced in Bible times. Yes, these mounds and the rock markings told us the story students of archaeology had been seeking in vain to find ever since the mines were lost. We were highly successful in bribing the guards with the aid of Ethiopian money, to permit us to look at some of the tombs. Which Photographs of King Solomon's mines are today aiding the drafting of another exploration trip into this same territory, and so cannot be released to public gaze, but here are Prorok’s authentic drawings of the mines. The map at the right shows the probable lo- cation of King Solomon’s mines, But if you intend going there, banish the thought. For when you are camped out there on the veldt and the tom-toms beat, all the gold in the world wouldn’s buy your chance for life. Inventions, July, 1936 may sound strange—our “buying them” in this fashion, since they were handling such vast quantities of raw gold. But if a guard was caught with virgin gold in his possession he was executed or mutilated. But any actual money was not disturbed. Then we heard the booming of giant tom- toms telegraphing messages to Ghogoli in his stronghold 50 miles away. His sacred ter- ritory was being invaded by members of the races he despised more than anything else in the world. And here in the mines danger . lurked everywhere. The blazing heat was all but unbearable and the guards looked murderous. Nevertheless, we started digging into the tombs and worked all that night and through the next day. But at dusk the tom-toms began to boom again. Time was short. We knew we must act with the greatest speed, and instantly. Hastily we packed up our specimens and started on a race for the Yabus River and safety, and three days later, utterly ex- hausted, we reached Albi Moti, the nearest Ethiopian village, praying that the promised military escort was there awaiting us with our official passports. But it was not. We camped on a hill near the village, and as if by magic suddenly found ourselves [Continued on page 141] KING SOLOMONS LOST GOLD MINE

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HEN England’s giant liner, the Queen ` Mary drops her anchors at quarantine, 32 tons of steel will grapple the mud bottem of New York Bay and swing her against the tide on 145 tons of massive steel chain. Captain Sir Edgar Britton, commanding her, says she is a “good sound job.” But what strikes one most is the loveliness of her im- mense presence. For she is a great lady, Glasgow born and bred to follow the tradi- tions of her ancestry—safety, comfort, sea- kindliness, regular arrival and departure, and speed. As speed queen hostess to 3,500 persons, passengers and crew, she has the most powerful engines afloat, cushioned as in an automobile, with the engine room “sprung” to eliminate the least vibration. Her ‘single reduction geared turbines develop 200,000 horsepower and operate four 35-ton propellers. She is 1,018 feet long, 118 feet wide, 135 feet high from her keel to the top of her superstructure, and she displaces 83,000 tons of sea water. - Should her double hull, in which a man can walk erect, be punctured, any one or all of 37 watertight bulkheads would close. Her 24 all-steel unsinkable lifeboats carry 145 passengers each. There are 30,000 electric lights to give her illumination, 50 miles of plumbing, 21 elevators, special garages, a shopping center, gymnasium, cafes, PUTS TO SEA lounges and even a kennel deck for dogs. Strength, sea-kindliness and ease of move- ment through rough water are built into Queen Mary’s knife-edge bow and all under- water “streamlining,” to keep her steady on the rough North Atlantic and stifle the pounding of the tremendous following seas of the eastern passage. And if you tune in Singing Sam’s deep bass final note of “Asleep In The Deep,” you will have an excellent idea of how the ship’s sirens sound. The deep, soft, far-~carrying

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the bridge below, and in addition to the glass weather fel Ne | / Og Nol “6 x aE z a) BOAT ENGINE screens, electric heaters keep the lookouts warm in winter. ay 5 : : r athe es an \e i pee HEATING ERAN Š S ; STOWED PLUG D na * aa Mona ich Eston eval ee P; ENGI i ees CONNECTION KEEPS LENGTH OF EACH LIFEBOAT 36 FT. GIN MOTOR WARM IN

BEAM I2 FT, 7IN SPEED 6 KNOTS COLD WEATHER

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Circus performers are trained from infancy. These skilled high wire artists are still in their early teens. Photos at right copyright by Ringling Btos. Above—-The lives of these artists rests on a small metal swivel. Should this snap they would be hurled to their doom on the sawdust ting fifty feet below. Right—The Walkmir Troupe take their lives in their own hands to present this daring feat of juggling. 50 Barnum & Balley | ILLIAN LEITZEL, the world’s greatest lady aerialist, had just finished her 100th muscle grind in the high dome of a Copen- hagen theater and the huge crowd of spectators were applauding loudly. Suddenly hundreds of eyes saw a slim graceful form plunging downward. The fall was not a part of the woman’s act. She had fallen to her death. ‘‘Crystalization’’ had weakened a swivel in her rigging, and once again this mysterious deterioration of steel had claimed another circus per- former; this time one of the best and most loved artists of the sawdust arena. Science has been unable to cope with this steel granulation and every season one or more. circus performer plunges to his or her death beneath the white tops. Next to the demon crystalization the biggest problem confronting the circus performer, and upon which their lives depend, is perfection in mechanical con- struction of their various riggings from which they perform their many dan- gerous feats. Every bar, swivel, guy wire and metal connection must be abso- lutely accurate in detail and perfect in construction. Hidden defects must be avoided in every piece of mechanism if the man on the flying trapeze is to survive from season to season. Many of the circus performers’ acci- dents are unavoidable, others could be avoided. Weather conditions, especially sudden changes in temperature, affects metal parts of the performers’ paraphernalia causing bolts, rings and steel wires to become brittle. Sometimes during extremely cool weather these metal parts will snap like brittle candy. Apparatus when mounted in several different Modern Mechanix Hobbies & directions from a single ring or other fasten- ing will, at times, create an uneven pressure causing the fastening to snap. This has hap- pened in Madison Square Garden, New York City, where several riggings must be guyed from the same fastenings or ring anchors. As the circus moves from a low altitude to higher country, the aerialist and acrobats must be on the alert to the lightness: of the air or they will over-shoot their marks. In high altitudes leaps and turns can be made with less effort than in low altitudes. Many of the leading circus performers make their own performing equipment, de- signing it and then creating it in every mechanical detail. Mechanical perfection, in many cases, is lacking. In some instances bolts and hooks are made too small and not strictly uniform. Inefficient mechanics who do not understand the proper details in con- structing metal aerial equipment, are often responsible for accidents beneath the white tops. A There are several professional manufac- turers of apparatus for circus performers who cater exclusively to this type of business. [Continued on page 131] Inventions, July, 1936 The success of the human cannon ball stunt was largely due to the mechanical genius of the elder Zacchini, an Italian mining engineer. His five sons have been per- forming this amazing act throughout the world. Photos copyright by Ringling Bros. Barnum & Bailey Here in the world’s larg- est tent several score of experienced aerial rig- gers are constantly on the alert for faulty bars. 51

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Full speed ahead in an MM Soap Box Racer! This “trike” wheeled speedster is second prize in the contest. THE PRIZES First Prize—A scientifically designed Soap Box Racer, complete with Doenut tired wheels. Second Prize—A Soap Box Racer of same design as above, complete with ball-bearing tricycle wheels. Third Prize—A set of four Mussel- man Doenut tired wheels. ale l | ; Li | MoN TURNS” | 1— NORMAL TREAD =>} POOR GOOD FRONTAL AREA — OR FLAT PLATE RESISTANC PORTANT. SKETCH ON RIGHT CONTRASTS GOOD DESIGN & POOR There is a tight and wrong to everything, including soap box racers. Right, in this case, means increased speed and victory. 54 Win a Soapbox RACING CA THE RULES l. From the letters contained in the three words “Hobbies and Inven- tions" make as many words as possi- ble. No other letters can be used. List all words in alphabetical order using pen and ink or a typewriter. Neatness will be considered by the judges, but elaborate entries will not influence their decisions. 2. Proper names, foreign words, and slang do not count. 3. In fifty words or less write a letter describing the article you like best in this issue, and what type of article you would like to see most in a future issue. WO Soap Box Racers! A set of Mussel- man doenut tired wheels! These are the three prizes in MM’s Soap Box Racer contest. First prize is a scientifically designed racer, fully equipped with doenut tired wheels! Second prize is a racer of the same design, equipped with ball bearing tricycle wheels! And the third prize is a set of four Musselman doenut tires and wheels. The winning of one of these prizes will make you the envy of all the boys in the neighborhood, and will be sure to put you right up in the front ranks in the pushniobile speed contests, To compete for one of these big prizes, all you have to do is write as many words as you can from the letters contained in three words “Hobbies and Inventions.’ Proper names, slang, or foreign words will not count. Then write a fifty-word letter or less describing the article you liked best in this issue and why, and what kind of an article you would like to see most in a future issue. Mail your letter and list of words to the Soap Box Derby Contest Editor, Mopern MECHANIX HOBBIES & Inventions, Greenwich, Conn., before June 24, Readers submitting the most words and Modern Mechanix Hobbies & R 4. Write your name and address plainly on your entry. No entries will be returned. 5. Webster's New International Dic- tionary will be used as reference in cases of disputed words. ; 6. The editors of this magazine will be the judges. Their decisions are final. 7. This contest is open to everyone ex- cept employees of Modern Mechanix Publishing Co. and their families. 8. You don't have to buy a copy of this magazine or be a subscriber to enter the contest. 9. Mail your entry to the Soap Box Derby Contest Editor, Modern Mechanix Publishing: Co., Greenwich, Conn. Entries for the contest must be post- marked on or before June 24, 1936. who fulfill other requirements listed in the rules will be awarded the prizes. Soap Box Racers built on sound engineering principles will prove to be the winners in the Soap Box Derbies to be held all over the country this year. Gravity furnishes the power, but science must furnish the speed. Naturally, the builder of the winning car will need to exercise considerable ingenuity in getting together his soap box derby en- trant. It is with the idea of showing what has been done, and what can be done that this article is written. All Derbies are rolling races. Pushing is not allowed. Consequently the car will have to be a good coaster before all else. This indicates ball bearings, perfect wheel align- ment, perfect braking and smooth steering control, Indicated also are a rather light weight, 3 5 , perfect load distribution approaching the ithe peu Bae inenen ideal of weight equally divided on all four sure, pneumatic, tired A z = wheels are fastest for soap wheels, and as little wind resistance as pos- box racers. Winner of third sible. While the latter is not of much mo- Here is the first prize in the MM Soap Box Racer Word Contest. This de luxe scientifical- ly designed, doenut tired racer is fin- ished in cream and navy blue color with cable brakes. place in MM’s contest will receive a full set of four. Inventions, July, 1936 55

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Small Details Decide Soap Box Derby Winners EUROPEAN STYLE USUAL TYPE > Fig.t i STRAP IRON z ge FG REAR AXLE BENT NAILS. STRAP IRON The" To Va" Se BRACKET. y 4 BRAKE PEDAL $: FIG.3 SUGGESTED DETAILS 2 ae A MOUNTING FOR Bi- \ A - \ CYCLE WHEELS LOCK HUB ON s a Jf THREADED END. 16 Ga-CLIPS HOLD nat —» & O P SPACER 3/8" CARRIAGE AXLE ENDS IN PLACE GROOVE FOR _ PIPE NIPPLE j WASHER FIG.4>^M-M" SPECIAL" REAR AXLE ASSEMBLY Srey SPRINGING AND SPECIAL STUB -AXLES ARE NOT FOR TRIKE" 7 “be rail OF BALL- BEARING CONVERSION FOR" TRIKE’ WHEEL REQUIRED IF MUSSELMAN DOENUTS ARE USED. WHEELS ONLY ment it does mean that what is known as “flat plate resistance” should be held at a minimum. Streamlining is of no value at the speeds these cars travel. To get all these desirable factors we start by looking over the wheels that are available. You can get baby buggy wheels from dumps and junk yards, but invariably they will be off-round in tread, of uneven diameters and vax ale" hee Avg ig CARRIAGE À É STRAP IRON JO" DIAM. PLYWOOD Ya BOLTS — aE ASAT Brace MEADE Uy y (aries Uff j DETAIL OF STEERING ae mank OFF Wa bg LAND COLUMN: | rores- A ee STRAP IRON Ao Se) o HANGER CUT OUT ad WITH A os FINISH. RIM OFF . A 7 ROUNDED Here a youthful builder is fastening Mat PIPE down the brake beam carriage. COMPASS A Also is shown the way in which SS 2 Yy WASHER AT rear axle is housed. in axle beam. T ` ; j BULKHEAD Such an axle cannot get out of line. Spred \ SS ZG v4 EACH END) n si 5 3/4" 5-pLy FRONT [we EvEBoLT A

will wobble in tracking. The best wheel from the OPTIONAL 3-PLY FLOOR POSITION OF ayar S-PLY. ES f \ SS : standpoint of the derby builder is the CARRIAGE à > A balloon doenut tired wheel. These Ee JZ wheels are ball-bearing, easy to install, BEAM ENGAGES | A P . p WHEEL TIRE ' A K and their soft pneumatic nature will absorb shocks and do away with the $ springing function, making entire total gorenns Sorun weight of car practically sprung weight. “ecu ronmug The next best thing is what is (tere raot) known as the 14” diameter “trike” or tricycle wheel. This wheel is much stouter than the ordinary baby buggy The chassis, together with steering and brake details are shown here. wheel, and can be had in any cycle The steering wheel can be made of five-ply wood or two layers of p three-ply. Fir is used for frames and three ply wood for floor. Shop. Such a wheel wouldn't stand much ALL FRAME MEMBERS OF Vg X1% FIR

RETURN SPRING \ STRAP IRON HANGER, ae CROSS MEMBERS ~ FASTEN FROM BRAKE BEAM =I’ x [5g'FIR-) SIDES WITH COUNTERSUNK LAG SCRS> CHASSIS DETAILS

56 Modern Mechanix Hobbies &

Drawings Show Strength, Speed of MM Racer Ad ——— 1/2" PIPE j KING PINS OF 1/2". WOODEN CRU Be PIPE TEES & NIPPLES WITH DRILL ROD PINS: „a PULLEY p 7 L AIRPLANE H oe Sine SPINDL 4 RADIUS ROD LZ AG | EE SHIM BLOCK Á Po FIG5 USUAL y TYPE WAGON: STEERING Ba OUT BOB er, SET IN POURED LEAD BIKE CONE. TIE ROD {G MODEL "A" E BRAKE T ` CONE CUT IN TWO SEE CROSS- a SM ; SECTION ` APRON. N, p VESA STRAP IRON FIG. MUSSE fi (ice) 7 EDV FERINIG EGTION 3 SLOT PERMITS ia "ALL BALL BEARING" SEC} PEIMITS SPINDLE TO SUIT STEERING AUTO TYPE FRONT AXLE TO CAMBER MHESE EMEC OLEC: ARM

groove in a 156”x15g” fir axle (commonly called 2x2) and is retained by %”x1)4” strap iron. clips bolted together as shown with s. a. e. auto bolts costing about 3 cents each, obtainable at auto supply houses. This as- sembly gives a stout wheel, of perfect align- [Continued on page 132] saat oye ‘The flange of the front axle cone is sawed off and filed round to fit hole as shown in drawing above. Lead is poured The completed assembly of the MM Soap Box racer is shown in this

GENERAL ASSEMBLY 5 J AND CONSTRUCTION phantom drawing. 22 ga. around it for a tight fit. DRAWING OF THE CAR galvanized skes AEE — DESCRIBED —— used to form the hood. 3/4" PLYWOOD DASH Wa" PIPE~SEE DETAIL) Geame TOF SIDE OF THE SKETCH OF STEERING WHEEL AND COLUMN | HERE TO FORM Low SEAT

of a chance of winning a national event with its flat, long greased i SCREWS bearing surface, so we must 3/4" PLYWOOD SEAT BACK 3/4" #6 F.H. Dr 22 GA. GALVANIZED needs make it a ball-bearing job. BHEETAIRONHOGO. IRON BRACE This can bedone; inthe rear AAA eae wheels, by threading the 7%” SHINGLE NAILS BEAM cold rolled steel axle for a length that will accommodate the hub and locknuts. The wheel is bolted securely to the axle. The axle turns in ball bearings that are inserted in a pipe nipple. See Figure 4, These bearings are “trike” bearings, costing from 12 cents to 25 cents each. You will find you can insert them snugly in a 11%” outside diameter water or gas pipe nipple. The Bere A end of the axle is washered and vETAIL oF auto Tyre *, . : Pi STEERING ASSEMBLY AND pinned. The nipple is set in a BALLBEARING KING PINS 1/4" PLYWOOD FLOOR &SIDES WHEELBASE 48 INCHES

“MUSSELMAN * 10" x 23/4" DOENUT- TIRED BALL BEARING WHEEL Inventions, July, 1936 57

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Brig. Gen. H. After months of intensive ground schooling, the student pilot takes off on a dual instruction flight. RECORD. 7 RA 8 1913 1918 1923 1928 1933 500 AIRPLANE SPEED RECORDS; ool} f (MILES PER HOUR) 440) ol 1908 1913 1918 1923 1928 1933 The spectacular pro- gress of aviation is clearly shown in these charts. No other in- dustry can show such great advances. Brigadier General H. H. Arnold, former aviation editor of this magazine, and Major Ira Eaker, two of America’s greatest pilots, men who have been in aviation since its birth, have collaborated in writing “This Flying Game,” a 268-page book dealing with all phases of aviation. Excerpts from the twelfth chapter of this book, published by Funk and Wagnalls Co., are reprinted here through the kind permission of the authors and publisher. VIATION is an industry. It includes many trades and a few professions within its extensive realm. In addition, many of the old and long-established trades and professions have fresh pastures opened up to them as a direct result of this new industry and its demands and opportunities. The uninitiated are prone tọ look upon aviation as merely a collection of pilots. Flying machines and flying men form the 60 H. ARNOLD Aviation, the giant infant of Industry, challenges youth to find jobs within its many fields. Where? How? Brig. Gen. H. H. Arnold, former aviation editor of MM, and Major Ira Eaker tell you in this chapter of their book, “This Flying Game,” published by Funk and Wagnalls. The young pilot, hav- ing graduated from dual instruction, is ready for his first sole. Parachuting. It is not as dangerous as it looks, experienced jumpers claim. Parachutes are life rafts of aviation. Charts and U, 8. Army Air Corps photos ‘reprinted by courtesy of the Funk and Wagnalls Com- peny. complete popular conception of the industry. Too many of us overlook the many men and the varied types of human occupation re- quired to give these airmen something to ride. Let us outline, briefly, this new field of endeavor; let us follow the tentacles of the octopus and thus learn something of the mag- nitude of the creature. On a western airport stands a magnificent plane, ready for a mad dash across the con- tinent tomorrow. Consider that plane. It is a complete vessel but it is composed of a mul- titude of co-related parts, accessories and complete mechanical assemblies. That ma- chine took a year in the building. First it originated in the mind of an airplane de- signer; then it was transferred to plotting board by skilled draftsmen. These blue- prints, upon being reproduced in manifold and transferred to the factory floor, set more than a hundred men at work on the plane alone. Before actual work can begin, a model of wood, complete in every detail, called a mock-up, must be built up by carpenters and skilled wood workers. This mock-up is then deliyered to the metal workers, who dupli- cate it in dural, since the fuselage or body of Modern Mechanix Hobbies & Surveys The FLYING Game Here is Brigadier General H. H. Arnold, co-author of this article and assistant chief of the United States Army Air Corps. All phases of aviation are covered by Brig. Gen. Arnold and his collaborator, Major Ira Eaker, in their book. the structure will probably be entirely of this material. This requires work by practically every type of artisan known to the metal trades—trollers, cutters, riveters, and formers. After the completed fuselage is rolled upon the assembly floor its power-plant installation begins. Other mechanics install an instru- ment board, carrying more than twenty in- struments and gauges. Others install win- dows, sound-proof the cabin, and complete the whole with seats and upholstery. The engine comes to the airplane factory as a complete assembly, but its construction has required an even greater number of skilled designers, engineers and mechanics. After the plane is completely constructed it is rolled onto the flying field, where line mechanics begin an engine run-in and tuning-up. The test pilot next takes the plane into the air for its trial flight. After the first, there will be slight adjustments of controls, followed by four to ten hours of routine flying to “shake down” the completed article, insuring its satisfactory performance. Special gasoline and lubricating oil must be placed aboard. These have been prepared for the air industry after a long series of Inventions, July, 1936 Aerial photography comprises no small part in the training of tomorrow’s pilots. war or peace training is invaluable. For almost every hour in the air the student-pilot spends at least 10 on the ground, learning aviation from A to Z Here two are mastering the art of folding a silk parachute. tests, as automobile products are not satis- factory for the airplane engine; thus an allied industry is brought early into the picture. The plane is located in a flying field especially prepared as a home and landing site for aircraft. This complete installation, with its hangars, runways, shops, operation buildings, and waiting-rooms probably cost more than two million dollars, required a year to build, and made work for several hundred men of many trades, running through the gamut of the building industry. Before the plane takes off, the pilot will receive complete weather reports gleaned over radio and wire all along his proposed course. These will be interpreted and pre- pared in final form by skilled meteor- ologists. The pilot tunes in his radio for contact with the ground organizations along the airway he is to fly. His course is not marked by [Continued on page 133] 61

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The DAREDEVIL DUB— The speed maniac is poison to veteran race by FRED GILMAN JOPP pilots, for he is the driver who has no regard £ for his own life or the lives of others. misguided daring is exposed in these pages. His The pilot is sa te breaks and throws up ly dowti. enough when the rear SE pier. drags the slows fies But that pear lying wi keel is dynamite when ing over a densely-packed crowd. MENACE of Auro RACING wheel, Above—The start of the annual Automobile Race Classic at the Indianapolis Speedway. This famous brick saucer has long been the thrill crucible in which motor cars are tesi and is the track responsible for breeding the mechanically- Death comes with dra- matic suddenness to the speedway. Whirled out On the dirt tracks, those high-banked as shown in the above illustration, the usual skid brings the spinning car down exactly as if it were a marble twirling around a saucer. As a consequence, a pilot is seldom injured when “weaving the apron.” It is the outside spin that worries him, for centrifugal force is pushing him outward. When this latter spin occurs on a banked curve, over he goes in a terrific impact which may mean death, 64 perfect, beautifully-appointed car that you drive today. NDIANAPOLIS! Stands and infield are packed with high-tension humanity. Everywhere is the multi-colored hue of race day. The aroma of crankcase oil is in the air, with all eyes glued to the gigantic brick saucer, where the steel whippets are receiving their final tuning. “Look!” shouts someone. “There is Kelly Petillo. If the jinx doesn’t ride with him, he’ll win again this year.” “And there is ‘Wild Bill’ Cummings over there,” says his companion. “Boy, does he roll a fast bus?” The cars are pushed into starting posi- tion, and telegraph keys and press type- writers leap into high and begin their feverish “tick-tack” to a waiting world. The referee dispenses eloquent caution, then drops his flag. The swarm of motored projectiles shoot forward. Despite your protracted anticipation, Modern Mechanix Hobbies & of his machine, as this actual photograph from a Universal Newsreel shows, this pilot fell to the track in front of his still-rolling car, and it crushed out his life. the start is unexpected. A blast of violent, all-swallowing noise from engines suddenly accelerated smites your ears with a pang of sharply-enhanced apprehension. The roar from unleashed cylinders swells and broad- ens, then temporarily breaks as the pilots lift heavy feet to ease their mounts into the turn. They circle the track and enter the straight- away in perfect start formation. Again the referee snaps his flag downward, this time with an authoritative jerk, and they are off— to a flying start! There’s Kelly Petillo, Floyd Roberts, Doc MacKenzie and Chet Miller out front, already for these boys qualified for the Champion 100-mile~An-Hour Club by averaging better than “100 miles per” for the entire distance last Decoration Day. And only fourteen Inventions, July, 1936 others have had the driving stamina and racing luck to win the Indianapolis Race since it was inaugurated a quarter century ago. Lap after $100 lap the pilots flirt and kid with death, the slipstream flattening them back, ears splitting from the howl of wide- open throttles, and always with eyes front that the curves may not gravity-slap them into the retaining wall. Lap after lap ... and look! That skidding ear! Those in the stands are out of their seats in a flash, for . . . CRASH!—a tangle of shattered men and cars. It’s happened! It was bound to happen. But why? Down in the repair pits the attendants don’t ask why. They know—know that a mechanical break in tight quarters shot a veteran pilot out of control, or that a “dub” pilot messed up the race. The “dub” pilot seldom will be found in 65

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SPLITTING the WAVES with the _ by DAVID A. BROWN A DOZEN outboard racing boats drive wide open toward the starting line as the hollow boom of a gun rolls out over the river. They get away in a straight line, but as they toar down the stretch three boats pull away ahd go into the turn fighting for the advantage, their sterns awash in a shower of spray and their bullet noses bobbing like flat stones skipping over the water. They are rounding the buoy in a bunch when, suddenly, the outside boat, its driver leaning far out over the gunwale to keep it from ledping out of the water, cuts in sharply, drives miraculously through a narrow open- 68 Outboard races are won or lost at the turns, Here is a thrilling bit of action with three contestants tounding a buoy during an outboard regatta. Note how C-476 is cutting in close to take the lead from his two faster competitors. Circle—-At the start of the race the motor digs into the water, carrying the stern down. The driver must balance against this with his weight. ing, and rockets out of the turn a full length ahead of the field. The race isn’t over, but by continuing to outgeneral the pack on the turns and by pushing his tiny seagoing chariot to mile a minute speeds, this dark horse pilot is able to cling to his advantage and to race home a winner. There are few dull moments in any out- board race, but there is little doubt that the greatest thrills come when a field of dare- devil drivers race their boats into a breath- taking turn in their efforts to gain a slight lead. It is agreed, too, by the men who drive these roaring river-comets that most races are decided at the turning buoys. The tendency among boat designers today is toward shorter and wider boats with little or no freeboard, In fact, most of the boats used are designed with sloping decks which meet the hull. One of the most radical of this latter type is shown on the cover of this maga- Modern Mechanix Hobbies & Aquatic sports reach their peak of excite- ment in outboard rac- ing, when sizzling spray fills the air and skill rides the waves to tri- umph over speed. Each year the records go higher. This article tells why and how. zine. Here the hull consists of nothing more than a surf board so designed that all buoy- ancy is provided by the planing action of the boat at high speeds. Two sponsons keep the craft afloat while gathering speed, and also serve to stabilize it on sharp turns. Motors, too, have been greatly improved. Not long ago the speed record for outboard boats was but a little over 25 miles per hour, but today four-cylinder motors which will turn up 6,500 to 7,000 revolutions per minute are used in Class F and Class X, and the record has been pushed up to 69.383 miles per hour. In fact, even the midget racers—50- pound boats powered with motors of 74% cubic inches piston displacement, with their tiny two-cylinder motors have done better than 33 miles per hour. The beginner at the sport, then, must learn not only how to eliminate the hazards that exist on the turns, but how to make use of them to gain an advantage. Leading the field, a pilot should hug the buoy as he goes into the turn and swing around it as sharply as possible to block out his opponents. How- ever, if a boat is prevented from taking the inside, the turn may be made so as to bring the boat about close to the buoy and inside of leading opponents as the swing is completed. Often a trailing boat may be maneuvered into the lead in this manner. If a turn is made too sharply, however, excess cavitation—propeller churning up water without developing power—will cause Inventions, July, 1936 STEEL TUBE CANTILEVER ‘OUTRIGGERS: ` ienn This radically new motorized surf board may easily establish a new PLANING fppoane 7 Sa world’s record. E nd) PEE WATERLINE- WATERLINE ~ J ENOENGIS ; iT SPEED i y AT REST A Ow Keser 8 As the boat gathers speed the side sponsons lift clear of the water and the craft skims on the planing board. In turning the sponsons dip into the water, in- suring lateral stability. a loss of speed which will more than off-set the saving in distance traveled. There is also the danger of wind catching the tilted bow and capsizing the boat in a close turn, as well as the possibility of a spill resulting when the outside gunwale dips and catches in the water as the boat slips away from the turn. These accidents may be prevented by moving forward in the cockpit and throwing the weight out across the gunwale on the inside of the turn until the buoy is rounded and the boat is straightened out for the return. River currents also must be carefully gauged. If the motor is throttled down too soon when going into a turn, a strong, adverse current may carry a boat into the buoy and wreck it. There is, too, a danger of being carried far beyond a down stream marker if 69

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Above— Square- sterned canoes for outboards are becoming increas- ingly popular. Right— Lincoln demonstrates in- convenience of carrying oil in five gallon cans. N THE estimation of most seasoned wilder- ness “trippers” there is only one type of boat that really fits into the situation when one is considering an extensive water jaunt and that is the canoe, The canoe of years ago, and somewhat in the present day, were round-bottomed. As a direct result they had but little gripping power on the water surface and would tip and roll from one side to the other. The canoes of today have not only a most de- sirable width at beam, but the bottom is almost flat over a generous portion of its The end of a perfect day. The modern canoeist takes his comfort with him into the woods. Air mattresses are replacing the laborious- ly cut balsam boughs, light tents eliminate lean-tos, while enough dehydrated food for a two weeks’ trip can be conveniently packed into a good-sized knapsack. Outfitting by ROBERT PAGE LINCOLN area. This flat-bottomed effect makes it cling to the surface in a manner that stalls off any real possibility of the canoe’s tipping over. A sixteen-foot canoe is considered of suffi- cient length for two persons. For three persons, however, the so-called guide’s model, eighteen feet in length, is a recommendation. This will permit of four packsacks to be lodged on either side of the canoe, eight in all. Or if a third person is carried, then that person may be seated toward the stern, just forward of the rear thwart. A neck or shoulder yoke to be used on the portages in carrying the canoe is a recom- mendation, especially if you are unfamiliar with carrying the canoe. These simplify portaging at least fifty per cent. Square-sterned canoes are often used in the north and Canada, where the outboard motor is brought into use. This type of canoe is rather heavy, but where there is comparatively little portaging to do it fits in perfectly; has a generous wide bottom, and is excellent to fish out of. The impression is often had that the out- board motor may be used only on a square- sterned canoe. Asa matter of fact, more out- board motors are used on the everyday sharp-bow, sharp-stern canoe than on the square stern. There is a bracket attachment CAMPFIRE. for the Canoe Trip made especially for canoes of this everyday type, as the result of which the motor is lodged on the side of the canoe, near the stern. Both the twin and single type of motor are used on the canoe. With outboard motors now being had as light as 20 pounds up to 30 pounds the excess baggage thus brought along is not overly great. Indeed, by the use of the motor the length of a canoe trip can be stretched out to twice the distance one would go if just paddling. The gasoline and oil are mixed together at the start of the trip, and are preferably carried in square gallon tins. These are then lodged in a packsack especially made for the purpose, cut straight as to side and flat bottom, so that the straight-sided tins will rest side by side in a truly compact fashion. A pack of these tins will weigh a little more, but they are far easier conveyed in this fashion than in the regulation five and ten- gallon cans. While the canoe leads in consideration on a wilderness trip, it should be remembered that all other items in the outfit, each in its department, require thoughtful selection. Regulation shelter tents of the so-called canoe tent or forester type are much favored. It is a requisite that these tents be so made that all windows and openings be covered with netting or bobbinet, to keep out all winged pests, Usually when the occupants of the tent are in for the night the plumber’s candle that is carried for light will reveal any mosquitoes inside. They invariably alight on the canvas, when a touch of the eandle flame will singe them. One can thus kill every mosquito inside of the tent. It is necessary to kill each one because one can keep you awake as well as fifty. Since air mattresses and sleeping bags are often used, and are recommended in [Continued on page 122] On portages a neck yoke should be used to simplify the task of carrying your canoe through the brush. If you do not have a regular neck yoke, one can be improvised by lashing your paddles to the thwarts parallel to the gunwales. In this way the carved handgrips of the paddles just fit the shoulders, and by moving the paddles back and forth, you can find the best balancing point.

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Building Usefulness Into HE basement, long the repository for cob- webs, lumber scraps, and discarded junk, is rapidly undergoing a transformation which will make this long neglected room one of the most popular in the house. In a recent contest sponsored by the Ameri- can Radiator Company among members of the New York School of Fine and Applied Art, 36 notable examples of what can be done with a cluttered up basement were presented. Working from floor plans and photos of actual cellars, the students built models of sports rooms, hobby rooms, play rooms, studios and all-around utility rooms. COST OF CONVERTING CELLAR INTO PLAYROOM STRUCTURAL ALTERATIONS artition K Merry-go-round, shelves, train table, ete. J PA Wa n iste $157.00 Special Furnishings, $83.00 The contestants tackled the problem by disguising obstructive beams and pipes with an all-over color scheme of unified colors. Basement pillars were used as the center for circular benches, tables or cabinets, while the floors were painted or covered with linoleum. The rough plaster walls were painted in pleasing colors, and in many ‘cases were con- cealed behind shelves, book cases, or covered entirely with paneling. The model basements, placed on display in Rockefeller Center, New York, immediately focussed nationwide attention on the Ugly Duckling of the home. Architects hurriedly Today’s kiddies are fortunate in having dads who plan their 80 play hours in such beautiful an safe quarters as the con- verted basement shown above. Circle— Just an old dust and furniture collector was this unused cellar. But at the low cost of $132 (minus appliances), the cellar was transformed as shown in photo above. Modern Mechanix Hobbies & Your Neglected Basement This basement belongs to an athlete, with the construction cost (without gymnasium equipment), 190 well-spent dol- lars. The draftsman (right) spent $235 for his home hobby. began making estimates on the costs of con- verting disreputable basements into charming rooms. They found that even in the most horrible examples the restoration would not exceed $400, while with the exercise of a little ingenuity, miracles could be wrought for as little as $50. Naturally the camouflaging of the furnace is a big item. If it is a coal burner this is usually accomplished by boxing it in a room by itself. Modern oil burners and air condi- tioners with their bright finishes and new designs, need no such concealment. If you are handy with tools, any number of treatments will suggest themselves. By using composition materials, you can write your own price for transforming the neglected basement into the home’s most popular room. Circle—-Not only is this basement useless and unsightly, but it is a fire-trap as well. At left is shown the same basement after re- modelling. The reno- vation, exclusive of furnace, cost less than $200. This room now equals any found in most expensive homes. Inventions, July, 1936 81

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MUSICAL FREAKS Win Fame E Just try to arrange all the instru- ments above so that they. will be instantly available to your lips. hands, knees and feet. Vincent Muni did it—made the “music go round and round” the nation to bring him instant fame, But it took mechanical ingenuity, plus the ability to play, to merge the whole into a weekly salary. T’S marvelous how a home workshop fan can make himself famous with a broom, a saw, a dozen tin cans or a few dingy bottles picked up from a junk pile. Take these assorted ingredients, mix in a little inventive genius, and you have the makings of a typical success story as drama- tized every week before the nation-wide audience of Major Edward Bowes’ famous radio Amateur Hour. On the Amateur Hour, saws sound like violins, milk bottles like xylophones, and glass tumblers like cellos. Almost any day some workshop musician may emerge with a band saw that sounds like an orchestra, or a drill press as versatile as a pipe organ. Victor Lundgren is an example of a young man who made good on the Amateur Hour as the inventor of a musical instrument which any home craftsman can duplicate in a few minutes. An ordinary house broom is the backbone of his instrument. He stretched a single wire along the handle, elevating it with a bridge like that used on a violin, For 84 All right, all right! Wire, glass, tin cans— anything. It was ali the same to these boys, who made jobs grow from their mechanical ingenuity. This article re- lates what you didn’t hear on the radio. Rehearsal found the Major tinkling Jack Sevant’s window glass xylophone, with the tincanaphone running second. a sound chamber he took an old wooden box about six inches square. This slides up and down along the broom handle and amplifies the musical notes pro- duced by playing on the single wire with a violin bow. Steeple Jack Kay’s musical invention is even simpler. He plays an ordinary har- monica, the simple music-producer made famous on radio and in the movies by Borrah Minevitch and in his Harmonica Rascals, but he does it with the mouth organ held out of sight behind his head. He does it by remote control through the medium of a two-foot length of rubber tubing. One end of the tube is held in his mouth; the other end delivers Modern Mechanix Hobbies & for MAJOR BOWES’ Amateurs lung power to the proper openings in the harmonica. . ii Somewhat more complicated are the in- ventions of Jack Sevant, who is practically a symphony orchestra all by himself, with no less than four novelty instruments to his credit. He was employed as a sweeper in a factory until he made such a hit on the Ama- teur Hour that he was signed as a member of a Major Bowes traveling unit which tours the theatres of the country. His musical bottles look like a drug store window display, except that they hang by their necks from a crossbar. They are ar- ranged in graduated tones, like the keys of a piano. The bottles are tuned by filling them with varying amounts of water, and are tightly corked to prevent evaporation. When tapped with small hammers, bell-like tones are produced. A cotton string is tied behind the row of bottles, touching them and dampening the after-vibrations like the soft pedal of a piano. Similar in principle is Mr. Sevant’s “tin- canophone,” in which cans are used instead of bottles. He even leaves the labels on, and thus A sharp may be tomato soup and High C sliced pineapple. The labels cannot be taken too seriously, however, for the food contents are removed from the cans and they are tuned in much the same way as the bottles. Window glass takes the place of customary metal [Continued on À page 124] 4 i | A bow, a broom, a wire and a box for a sound chamber brought Vic- tor Lundgren fame for his ingenuity. Marshall Rogers’ delicate fingers stroke the goblet rims, and the crooning glasses sing to millions. If the flagpoles Steeple Jack Kay painted were oye mere laid end to end, they $ wouldn’t reach half so fat as did his remote Es control type of har- { monica playing when the «= Major put him on the air to win plaudits for SSS his utterly unique style in Piped music. He doesn’t paint flagpoles now a Inventions, July, 1936 85

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3/8" 3-PLY LIGHT ALUM. TUBE SWAGED Ç tomy FIRTRANSOM TO RADIO PANEL SNAP NOF oN SWITCH CONTROLS IGNITION \ SHAFT LOG OF WALNUT GLUE WITH CASEIN AND FASTEN TO f BOTTOM WITH SCREWS DRIVEN \ f FROM BENEATH a \ OY DECK LINE AT COCKPIT He DECK LINE AT SHEER y), by WESTON FARMER MARINIZED "CHINOOK" ENGINE POSITION OF AUXILIARY CARBURETORS — IF USED WALNUT STEM PIECE STRAPTOFRAME AND STEM MOULDING $ Ma f CHINE LOG 1/4" X 1/4" F i #2-56 BOLTS. 4 FLASHLIGHT, | BATTERIES 6VLT HOSE TO WATER INTAKE OF ENGINE BRASS SHAF | REAMED To 3/16" IN-DIA. TRIM TO 90? | S : 2 LEEVE 1 1/8" COPPER BOTTOM ~1/8" 3-PLY BASSWOOD: PIPE EL j i | | m g" | ag = ma ag i i N REEFING CHINE PIECE OUTSIDE CHINE - 3/16" X 3/16" BIRCH bn = = i CLAMP - 1/4" X 1/4" BIRCH! D Ta" X i/4* BIRCH „COCKPIT STRINGER- ae Diaea aes = G DECK WITH 1/8" 3-PLY BASSWOOD OIL HOLE “SUNBEAM ”-Fıic.2 Di NOTE- ALL FRAMES 3/8" PLYWOO0 EXCEPT AT STEP FRAME WHICH IS OF 1/2" PLYWOOD.. USE /2"# 3 FLAT HD BRASS OR COPPER SCREWS THRUQUT SCALE IN INCHES In building “Sunbeam” follow the plans carefully paying close attention to the various dimensions. The above cross section diagram clearly shows the arrangement of the hull as well as the location of miniature engine and ignition system. OTHING affords more pleasure than to see a model hydroplane, built by your own hands go skimming through the water in a most realistic manner. Powered by “Chi- nook,” the miniature gasoline engine de- scribed in the May issue of MODERN MECHANIX & Inventions, “Sunbeam,” as the model race- boat has been named, is the last word in model marine craft, The construction of the hull is not at all difficult as one will learn after examining the detailed plans. Birch and 3-ply basswood are used to form stringers, frames and inci- dental parts. To begin actual construction first repro- duce the lines drawing full size on a drawing board, then draw out the patterns for the frames, deducting 4%” all around for the 1%” plywood basswood planking which is used. A keel pattern board must be cut out to space the frames and to keep them aligned while you are screwing on the side planks. Line the keel pattern board up on the drawing board as shown in the sketch, Fig. 1, and the 90 STUFFING BOX ` 18" 3-PLY BASSWOOD | SIDE PLANKING i A REEFING CHINE PIECE 3/16" X 5/8" BIRCH ENGINE STRINGER - SEE DETAIL BELOW ae ee HEIGHT AND ANGLE AT "Bua" SLOPE TO COINCIDE WITH TO SUIT ENGINE AND INSURE | BOTTOM AFT OF STEP ALIGNMENT OF DRIVE, SHAFT E aE + dg i ; : ee 2 a A NOTCH FOR FRAME #2 | vs NOTCH FOR FRAME wel $ AP ii of lyk- FIG. 2-A.MAKE 2 ENGINE STRINGERS OF BIRCH TO SUIT ENGINE USED frames are then put in as progressively shown. The transom is solid, of course, and is beveled for the proper rake before being temporarily fastened by brads to the keel pattern board. Attach the walnut nose piece to the keel pattern board, which can be of 34” scrub stock, and then put in the sheer clamps and the chine logs. The construction of the frame at the step has been made clear in the draw- ings. Use 34” No. 3 flathead brass screws for the planking, or 4” size if screwing into end grain in the plywood frames. The sides are attached to the chine log and sheer clamp with screws spaced about 114” on centers. Thick casein glue is also used in attaching the sides to the clamp and chine. Being waterproof it will prevent leaks. Next the bottom aft is put on. This is a simple operation, but it might be wise to state that all the holes for the screws must first be Modern Mechanix Hobbies & “SUNBEAM”—a__ Flashing MODEL Raeeboat Powered with the MM “Chi- ; es nook” this model hydroplane / | Seisa ua raa offers model fans new thrills. for her first trial run. The tubular device in center is the spark coil. drilled with a root diameter drill N to a depth of 14” in order to pre- i : PN vent splitting. Countersink the oe E screw heads flush with a rosette. ae The crown is cut into the aft formers. Forward, separate crown formers must be made and as these will take some fitting and beveling to get them right, they should be made as separate pieces, later to be glued. Di A former is used to determine the proper crown for the hydroplane. Painting of the hull should be done with priming coats of half boiled oil and turpen- tine. When dry, sand, and apply synthetic auto enamel in colors desired. The original “Sunbeam,” as shown in photos, was painted a buff cream. ; While construction of hull is quite simple some explanation as to “Sunbeam’s” opera- tion is in order. First, you will notice that the boat has no rudder. Since it is operated from a central stake or tethering boat moored in The table - gives the offsets for the F measurements not indi- cated on the lines plan and profile. Deduct from above dimensions for planking. shown below TABLE OF OFFSETS FOR DIMENSIONS NOT SHOWN ON LINES PLAN — OFFSETS TO OUTSIDE OF PLANKING OUTSIDE CHINE REEFING CHINE SHEER LINE | AFT DECK CROWN REEFING CHINE : eee : | MAKE KEEL PATTERN TO SHADED PROFILE PROFILE - HEIGHTS ABOVE BASELINE ral SHEER|& CHINE LINES COINCIDE | į | OUTSIDE CHINE 1 SHAPE OF PROJECTED TRANSOM g" | HALF-BREAOTH "SUNBEAM"=20 MILE MODEL HYDROPLANE FRAMEIAT STEP IS FWD. OF q" STATION LINE- ALL OTHER FRAMES GO AFT OF THE LINE 2 i ; L n 43 sss AI ae Fig.1_ DIMENSIONED PLAN ~ HALF-BREADTH LINES PLAN & PROFILE LF-BREADTHS FROM CENTERLINE The lines drawing should be reproduced full size on drawing paper according to the above measurements before starting any actual construction. Note that the placement of frame at step is forward of the station line while all other frames are aft. Inventions, July, 1936 91

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Lay Out Plans To Full Size Before Building CROWN TO SUIT CUT KEEL PATTERN BOARD TO FULL SIZE Jig Saw Aids In Making Smaller Parts For “SUNBEAM” CROWN PATTERN — SEE EXPLANATION IN TEXT RETARD — ~a AACE PROJECT INTERSECTING LINES ALONG BASE LINE A-8 POINTS = = BRASS PLATE pane >- KARD OIL F.H.BRASS SCREWS ING. THE FORMER IS REMOVED BEFORE THE DECKING IS LAID BUT AFTER PLANKING. BEVEL & FIT. TRANSOM F TRANSOM CROWN | FALLS OVER ENO OF BOARD AS INDICATED DRAWING BOARD FIG. 3- DETAIL OF KEEL PATTERN BOARD, OR JIG, SHOWING METHOD OF ASSEMBLING FRAMES ‘the middle of a lake, and a cord, such as a stout fishline, is hooked with a brass leader into the brass rail at the starboard side, a rudder is not required. The engine is started up and the craft gently lowered into the water. A good push sets it into motion after which the line is paid out for about fifty feet. A fishing reel mounted on a stub pole is ex- cellent for this purpose. When the gas runs out the boat can be reeled in. Should the cord break, or should you wish to stop the boat before the run is finished, an ignition switch on the side of the decking allows a cord or a pole to be used in swiping off the ignition in emergencies. The switch is a radio toggle type with a tubular ex- tension. Cooling, water for the engine is obtained preferably through the strut. The strut can be drilled as shown, and a tube led 92 þa SHEER LINE To a | kä 16 AFT OF STA.LINE i NOTCH FOR PROFILE LINES AFTER DEOUCTING FOR NOSE FRAMES Y PIECES, TRANSOM AND 1/8" PLANKING AND DECK- ay] TYPICAL FRAME. pt p- GP ” \ ot v7 FIT NOSE BLOCK AND ALL FRAMES ~ PROGRESSIVELY--= * VARIES WITH FRAME NO. NOTCH FOR CLAMP NOTCH FOR CHINE Fi fig PROFILES ~STATIONS TR. 4 ALL MEASUREMERN, FIG. BASE TNE TO OUTSIDE OF pi ANKING Above is shown the detailed diagram for the keel pattern board. Cut this according to the dimensions of the keel profile pieces deducting for nose pieces, transom and 1⁄4” planking and decking. Bottom of finished hull is shown. through the transom, from which a rubber hose is used to carry water to the jacket in- take of the engine. From the jacket it is piped overboard, Although a scoop can be used the strut idea has the advantage of the engine being cooled even though the boat is not in motion. Without the strut scoop the motor will heat when running at a dock. Ignition for the motor is supplied by an aero model spark coil. Current for the coil is obtained from four flashlight cells wired in series and soldered at the contacts to give six volts, If the popular Duplex carburetion is used, several changes are required. One is the matter of forcing fuel to the carburetors, which in this case are higher than the fuel. To do this a rubber tube is run from the goose neck vent in the gas tank, to a small balloon which has previously been blown up by lung power to give one to two pounds above atmospheric pressure. This will keep gas at the needle valve. In the orginal carbureting system, as shown with the aero engine, no balloon is necessary. The method of laying out the screw pro- peller is shown in the drawing. Be sure your wheel is a “true screw” wheel, with all parts of the blade advancing at the same pitch, so that in one turn all points would travel the Modern Mechanix Hobbies & wá 7 TA fo À shart ” A CAM SET SCREW ee FIG.64~ SUGGESTED | TIMER- FOR MOUNTING ON THE STUFFING BOX FIG.6 = WIRING DIAGRAM-CAM ON TIMER HOLDS POINTS APART UN- TIL SPARK 1S WANTED; THEN PONTS CLOSE AND OPEN -ONE SINGLE HOT SPARK OCCURS ‘AT PLUG AS POINTS OPEN. CONDENSER ACROSS SPARK POINTS PREVENTS EXCESS SPARKING, S- 2 BRASS TETHERING PLATE => ts, hee o M ab, CROWN FORMER SEPARATE PIECE STEM MOULDING REEFING CHINE This is the appearance of the hull after the framing has been completed. Crown pieces are glued in place over the frames to form a rigid support for attaching deck. For best results use a jig or coping saw for cutting frame and crown pieces. same distance no matter what their radii from the hub. By using the method of layout in the drawing you assure this. The wheel can be cast as shown in the diagrams, using old piston alloy stock out from junk autos for metal, or you may build up props silver soldering hammered blades to a brass hub as the drawing shows. Should you wish a variable spark control it can be arranged by making a timer as shown in cross section on the inboard profile and in the detail drawings. This will make the engine a bit easier to start and offer the advantage of a controllable speed. In the Chinook aero the timing is fixed. In case the stuffing box timer is used the wiring is of course led to it according to the wiring dia- gram after which the ordinary timer be- comes inoperative. The engine is started by winding a cord around the flywheel in strop fashion. For fuel, lubricating oil is mixed with the gasoline to the ratio of about 1 pint to each quart. Use heavy oil, and high test gas for best results. BLUEPRINTS FOR “SUNBEAM” SPEEDBOAT Enlarged blueprint plans for building Sunbeam” will greatly simplify construction. These plans are Order Blueprint No. available at $1.00 postpaid. Meara Modern Mechanix Publ. Co., Greenwich,’ onn. Inventions, July, 1936 3/16" 1.D. TUBE HAND THUS ROSETTE i S e d APS we FIG.5 - FRAMING PERSPECTIVE + COUNTERSINK THE HEADS FLUSH BY = Fm [| A AA ar 18" 3-PLY j BASSWOOD A A L A SEE DETAIL OF ` BOTTOM AT STEP & a MORTISE AROUND LEFT HAND WHEEL IGHT H. J. = 13/a"D x 2 1/2"P Ri AND WHEEL ROTATION LOOKING FWD. — HOW TO LAY OUT "TRUE SCREW" PROPELLERS l. —* LAY OUT LINE O-D. EQUAL TO CIRCUMFERENCE 2. LAY OUT LINE O- Y:PITCH 3. DIVIDE O-D INTO FOUR EQUAL PARTS A,BC-D THE RESULTING ANGLES ARE TRUE SCREWAT FACE OF BLADE ***SHAPE PATTERN WITH 1/8" THICK BLADES; FILE CASTING AND FINI H BLADES TO 1/16" THICKNESS THIS DIMENSION ook, ETERMINES ~ et Saag X D= 3.14 x 1.75" (CIRCUMFERENCE) Fee ` BUILT UP PROPELLER CUT BLADE HOLLOW IN HARDWOOD BLOCK A HAMMERED BLADE 2 Propeller is made as shown above by soldering hammered brass blades to the propeller hub. If desired the propeller may be cast from white metal although a great deal of care is needed to do this. SILVER SOLDER BLADE TO HUB 93

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Air Conditioner Sends Cool Breezes Through Heater Pipes with the unit on some summer days, it may rise above 55 or 60 degrees, then for the best cooling effects the water can be shut off, the basement floor wetted down and the air blown through the unit without benefit of the water box or condensing plates. Experiment will determine the best adjustments for all con- ditions. Wood construction for the most part is specified. Use cypress for all construction between the fan and the furnace. If you have the facilities however, and prefer, you

PIPE SETS FLUSH „TO FLOOR LEVEL: RECESS FLOOR FOR. PIPE NUT

can substitute galvanized iron for practically all of the sections. Tongue and groove the boards for the top, sides, ends and bottom of the water compart- ment. They are 3 feet square and 26 to 28 inches high. The baffle or condenser plates are bent in “V” shape and installed, as shown. Directly in front of the baffle a hole is cut for the outlet compartment. The wet air draft passes between the off-set plates which con- dense the surplus moisture, and is then de- flected upward by the galvanized iron vent which is nailed to the inside walls of the outlet compartment. A lip of galvanized iron is bent over as shown so that an occasional drop of water will be caught and thrown back into the water box. After passing through 96 SEE DETAIL Of. LIGHT ANGLE [RON i 3 EB E z TOP BOARD TO SUIT SEE SECTION |

3/32" x 1“ — STRAP |RON~ NOTCH TO FLUSH FIT >|

AL VIEW FOR DETAIL. OF ASSEMBLY

FILTER FRAME COUNTERSINK ALL SCREWS

LIFT OFF DOOR

J LIRON- | STRAP IRON = SECTION THRU FILTER 1” X 2" CLEATS FORM GROOVES FOR FILTER = FRAME, PIN. SPRAY NOZZLE |S CENTERED

“AIR FILTERING. COMPARTMENT

GENERAL LAYOUT OF AIR WASHER TANK

The air conditioner’s washing tank should be constructed from cypress wood to insure against rot. Make the filter cloth according to the above diagram. Use screws throughout in constructing the tank.

BAFFLE PLATE- MAKE 20 - LE PLATE BATT SEM BLY

In order that the moisture does not pass into the furnace jacket a metal lip as shown above is installed directly behind baffle. Modern Mechanix Hobbies & Pictorial Diagrams Aid In Simplyfying Construction the vent the air enters the 16-inch pipe and on into the furnace jacket. In the center of the baffle mount a strip for supporting a copper disc to form the spatter plate. The disc should be in direct line with the pin stream of water which issues from the spray nozzle. The tiny stream of water strikes the spatter plate and is broken into minute parts which cool and wet the air. The piping comprises an inlet pipe near the right end of the water box of sufficient height that when the nozzle has been screwed on the pin stream is centered with the spatter plate. The lower end of the pipe is provided with 2 inches of thread, permitting thin nuts and washers to be screwed on each side of the cypress floor. The other pipe which is simply an overflow or drain also has rather long threads permitting the top nut to be screwed on in a recess cut for it, thus bringing the pipe top level with the floor. This makes it pos- sible to drain off all the water when not in use. A valve provided in the drain pipe is adjusted so as to keep a few inches of water The cold air down pipe fits on the top of the electric fan box, supply- ing cold air from joist line. Water spray not used on very hot days. AIRTIGHT JOINTS \ \ 225 SHORT PIECI 16" DIAM. GALV. PIPE `~

`N FILTER BOX END PIECE OF CYPRESS WOOD SCREW ~- in the bottom of the washer tank at all times. This filter frame slides up and down in a groove at each end of its compartment, the grooves being formed by cleats nailed inside the ends and spaced just far enough to permit moving the frame easily up and down for withdrawal. The right end of this compart- ment is covered with a cypress board which has a hole cut in it to take the end of the short 16-inch diameter galvanized pipe leading from the fan box. The fan box can be made of white pine if Inventions, July, 1936 desired, since no moisture of an excessive nature will be present here. A standard air fan can be mounted on the motor shaft, although a 2-bladed aluminum propeller fan is to be desired due to the high speed of the motor. A second-hand washing machine motor will do nicely for the power plant. It is essential, of course, to have the motor mounted on blocks. to center the fan accu- rately. The blade tips should clear the sides of the galvanized pipe not more than 14-inch all the way around. By providing small lag screws on the end of the motor box easy [Continued on page 122]

COLD AIR DOWN PIPE NOTE: FAN BOX MAY. BE OF WHITE PINE. \ THROUGHOUT, ALL a JOINTS NAILED EX CERT WHERE NOTED IN THE DRAWINGS CUT OUT TO COLD AIR PIPE SIZE AIRTIGHT JOINT RUBBER GASKET REMOVEABLE INSPECTION va PANEL

SMALL LAG SCREWS

BLOCKS FOR MOTOR MOUNT. AS REQUIRED TO LINE UPAND CENTER THE FAN

1" X3/32" STRAP IRON HANDLE

GENERAL LAYOUT OF FAN COMPARTMENT

'~

Build the fan compartment according to above specifications, mounting the motor on blocks for simplified adjustment. An old automobile fan is excellent for supplying necessary draft. 97

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BUILD “HANDY HENRY"

ENDS ONLY- DIFFERENTIAL AND UNIVERSAL— OF SHAFT ARE USED

FORD "T" FEMALE A TRUCK DIFF JOINT (FORD UNIVERSAL) FROM AXLE HOUSING

FRONT DRIVE SHAFT OF TRUCK DODGE TRANSMISSION DRIVE : SQUARED TO FIT FORD SHAFT i j UNIVERSAL HOUSING r DODGE, FRONT OF TRANSMISSION, BEARING PLATE

PARTS 384 FORM I UNIT REPLACE SHAFT To provide sufficient flexibility the chassis is cut down as shown. Cut out the original drive shaft housing and insert a dodge transmission to provide the necessary gear ratios for pulling heavy loads. Transmission is welded to bell housings and supported by “T” frame member. Welds must be secure. by E. H. GIBSON ERHAPS in your own back yard you . have an old Model T Ford truck or passenger car that wasn’t worth a license tag. If it is a truck so much the better, then all you will need is the transmission from an old Dodge. The tractor described here is capable of handling any two horse load, at a faster speed than horses and on nominal gas consumption. It should be noted that the plans have been 100 6" PLANKS SUPPORT FRAME

ASSEMBLY OF HANDY HENRY TRACTOR NOW HAS 6 FORWARD AND 2 REVERSE SPEEDS- FORD AND DODGE TRANS- MISSIONS ARE USED IN CONJUNCTION FORD MOTOR

A Zfeacni __RFRONT SS YA f/f BABU BOD “RADIUS RoD SG PSR ENEC TIE ROD |

CLEAR RADIUS DODGE TRANSMISSION WHEN TURNING The above pictorial layout shows the placement of all parts on the com- pleted tractor. The tractor is shown at work, in the upper left hand picture, doing the work ordinarily done by a Tyee here PART ay HOOK IRON team of horses. Removable rims per- (DIFFERENTIA\ ~BOTH SIDES- mit the tractor to operate on either FITTING) 4 PART BOLT THRU = pneumatic tires or flanged wheels, DRAW BAR ~O) TRANSMISSION SUPPORT

DODGE STUB HOUSING A WELD 3 WORM GEAR Jf: DIFFEREN = A TIA IF USING PASS. CHASSIS REPLACE THIS UNIT WITH ”T" WORM GEAR TRUCK DIFFER- ENTIAL COUPLING DIFFERENTIAL TO TRANSMISSION In order to use a double transmission the worm drive shaft on the Ford must be squared to fit the Dodge universal joint. If a passenger chassis is used for tractor replace the “rear end” with one taken from a “T” truck. Since all parts are num- bered on diagram they may be easily identified in assembly. Part “A” in one diagram and part “A” in another are same. Modern Mechanix Hobbies & With T Fords available throughout the country any shop man can easily convett one into a practical tractor. DODGE TRANS wil FORD. "T" TRUCK DIFF

=

"fi ; ! sly HITCHES BOLT TO DRAW BAR- F © IEF. lu > O PIE Foie "U" IRON HOLDS eh | DIFF TO BLOCK & FRAME

FRONT AXLE ASSEMBLY

ae oo SHORTENED SPRINGS CUT OUT [8" FROM AXLE-. SUSPENDED ABOVE „REJOIN AS BELOW

PERCHES

AND SPLICED i AXLE CUT WELD WITH CLEAT IRONS RIM TOGETHER

ANGLE IRON The axle splice is shown above. removed here it is necessary to shorten front springs, too, The radius rod is fastened to bottom of spindle bolts instead of on the top as it was formerly. The flanged rims are buit Since eighteen inches are up from old rims which have been welded together at split joint and lugs bolted on to provide traction in soft earth. car, it will then be necessary for you to obtain a Ford truck differential. Any wrecking yard should supply one with low gears for not more than fiye dollars. The Dodge trans- mission should be bought for about $2.50. A regular T model passenger car frame is used and the first job is to strip it of all unnecessary parts, then block it up and re- move the rear end which will later be, replaced by the.truck differential. A good . radiator and motor are the important parts of the tractor and to aid in cooling a water pump may be installed. Next block up the front end and remove the front wheel assembly and spring. This is then dismantled. The object here is to narrow it up 16 inches to permit shorter turning. With a yard stick or tape find the exact center of the front axle. [Continued on page 120] 101

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An examination shows the paint above coming loose from the wood in large flakes. A mag- nifying glass proves that the coating disinte- grates by crack- ing, curling and flaking up from the original paint. 110 PAINT WISELY On three sides of the house pictured here, the paint cracked aid scaled par see left Hae oto. the le, fourth side, the a fully exposed to weather, paint gave excellent service, as shown in lower left photo. On the bad sides the wood carried six coats of paint, the good side only three. Originally painted with lead and zinc and sub- sequently repainted with a titanox, lead and zinc type paint, photograph above shows paint failing in an unaccountable way. Going to paint your home? Ex- pect trouble—blisters and such? Forewarned is forearmed, and this article may save you trouble. OUSE paint which cracks and peels in less than two years after application is fail- ing unreasonably soon. If the previous coat held up well; if you bought the best quality paint and had it administered by reliable craftsmen, you are probably bewildered to know why. the present coating has failed to keep its bargain with you. The reason may be one of a number which the United States Forest Products Labora- tory at Madison, Wis., has discovered respon- sible for failure of exterior paint jobs. If you are one of those owners, the re- painting of whose home in the next year or two is an utter necessity, let the laboratory’s findings safeguard you from the exaspera- tion, and, worse still, unnecessary costliness, which are the outcome of mistaken painting practice. With a reliable painter as con- sultant, you can go a long way toward diag- nosing the paint ills of your own home if you compare its symptoms with typical case histories recorded by the laboratory. It is bad policy to try to apply a white or tinted paint over brown, green, or deep red. He who does so, does it at the risk of early The house at the left was built in 1931 and painted with pure white lead, a satisfactory job. In 1934 it was re- painted with a hard, quick-drying paint. The above photograph ~ was taken only a year after it was applied. Modern Mechanix Hobbies & by M. B. HOPKINS and SAVE MONEY This paint neglected house is typical of those on which white paint is applied over a dark color, a fine example This house is a chronic peeler, for the side walls get wet every winter, making new paint jobs blister and peel, as shown in the circle. The paint job will never satisfy until some way is found to keep mois- ture out from behind the painted boards. “disagreement” between the colors. Even between whites and tinted whites, incom- patibilities may exist, especially when dif- ferences in amount and kind of pigment are marked. If your house has always been painted with the soft type of paint, but no new paint has been applied for seven or eight years and the coating has thoroughly disintegrated, you are in luck. Have the painter merely dust off loose chalk and dirt, perhaps cleaning a few places where soot or grease from oil-burning furnaces have collected on shaded parts of the building, and brush on new paint. Two Inventions, July, 1936 of paint incompatibility. The house up above was not painted for eight years. From a distance the paint looked shabby. A closeup photo reveals the paint worn down to bare wood. Two new coats will fix it up fine. coats of new paint are necessary. As a rule, the new paint should be of the same soft type previously used because the chances are that the job will again pass through a long period of neglect before it is repainted. If, however, you feel that in the future you will repaint before the coating disintegrates badly, it is practicable to apply the harder types of paint over this surface. The first coat of new paint should be thinned with linseed oil and rela- tively little turpentine or other volatile thin- ner, using not more than 114 gallons of total liquid to 1 gallon of soft paste paint. If your house has been painted and two or three times repainted with paints of a fairly hard type, but you have waited a little too long each time before calling in the painter, you’ve no doubt found successive repaintings less and less durable. If close inspection shows that the paint is disintegrating by flaking and scaling rather than by crumbling; if at the edges of the cracks the coating curls upward and eventually falls off leaving a patch of bare wood; if the coating still clinging to the wood has jagged and inse- [Continued on page 130] 111

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