Modern Mechanix, May 1936

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Foort by Fn HRK | CANT GET OVER HOW SKINNY YOU WEREATEW WEEKS AGO NOW I KNOW THERE IS NO EXCUSE FOR BEING SKINNY n m^ 2» ag RR s no p U f "H eel. E m le M au Amazing Gains in Weight with New * € 47 Daurns?? Ala a d n A s 7-Power” Ale Yeast Discovery VEN if you never could gain an ounce before, remember thou- sands of skinny men and women have put on solid, naturally attractive flesh this new, easy way — in just a few weeks! Not only has this new discovery brought normal, good-looking pounds to hosts of thin people, but also naturally clear skin, free- dom from indigestion and constipation, new pep. Scientists recently discovered that thousands of people are thin and rundown for the single reason that they do not get enough Vitamin B and iron in their daily food. Now the richest known source of this marvelous body-building, digestion-strengthening Vitamin B is ale yeast. By a new process the finest imported ale yeast is now concentrated .7 times, making it 7 times. more pow- erful. Then it is combined with 3 kinds of blood-building iron in pleasant little tablets known as Ironized Yeast tablets. If you, too, need these vital elements to build you up, get these new “7-power” Ironized Yeast tablets from your druggist today. Then, day after day as you take them, watch flat chest develop and skinny limbs round out to natural attractiveness. Constipa- tion and indigestion from the same cause vanish, skin clears to normal beauty—you're an entirely new person. Try it — guaranteed No matter how skinny and rundown you may be, try these new Ironized Yeast tablets just a short time, and note the marvelous change. See if they don't build you up in just a few weeks, as they have thousands of other men and women. If you're not delighted with the benefits of the very first package, your money will be instantly and gladly refunded Special FREE offer! To start you building up your health right away, we make this absolutely 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 health, *New Facts About Your Body." Remember, re- sults guaranteed with the very first package—or money refunded. At all druggists, Ironized Yeast Co., Inc., Dept. 565, Atlanta, Ga.

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'M NOT GETTING ANYWHERE. FIELD TO MAKE MORE MONEY Clip the coupon and mail it. I will prove "to you that I can train you at home in your spare time to be a RADIO EXPERT, I will send you my first lesson FREE, Ex- amine it, read it, see how clear and easy it is to understand. Then you will know why many men with less than a grammar school education and no technical experience have become Radio Experts and are earning more money than ever before as a result of my Training. Many Radio Experts Make $30, $50, $75 A Week In about 15 years, the Radio industry hag grown to a billion dollar industry, Over 300,000 jobs have been created by this growth, and thousands more will be created by its continued development. Many men and young men with the right tralning— the kind of training I give you in the N. R. I. Course—hare stepped into Ttadio and quickly increased their earnings. Get Ready Now For Jobs Like These Broadcasting stations use engineers, oper- ators, station managers and pay up to $5,000 a year. Manufacturers continually employ testers, inspectors, foremen, engi- neers, servicemen, buyers, for jobs paying up to $6,000 a year. Radio operators on ships enjoy life, see the world, with board and lodging free, and get good pay besides. Dealers and jobbers employ servicemen, salesmen, buyers, managers, and pay up to 75 a week, My book “Rich Rewards in Radio,” tells you about these and many other interesting opportunities to make more money in Radio. Many Make $5, $10, $15 A Week Extra In Spare Time While Learning The day you enroll I start sending you Xxtra Money Job Sheets which quickly show OUGHT TO TRY A NEW V F Yes, / wi// send my First Lesson FREE fo show how easy If Is fo TRAIN AT HOME FOR A GROWING FAST 7-7 AND THE NATIONAL RADIO RIGHT AT HOME IN SPARE TIME GOOD I HAVEN'T HAD A RAISE IN YEARS -- GUESS 1 NEVER, WILL -- I'M READY TO GIVE UP LOOK AT THIS -RADIO IS CERTAINLY INSTITUTE SAYS THEY f TRAIN MEN FOR RADIO SAY -- THIS WAY OF LEARNING IS GREAT. I'M GOING TO ENROLL. THEN | CAN BE A SET SERVICING EXPERT-- OR GET A JOB IN A BROADCASTING STATION -- OR. ) INSTALL LOUDSPEAKER BUCK UP, BILL, WHY NOT TRY AN INDUSTRY THAT'S GROWING -- WHERE THERE'S NORE OPPORTUNITY | DON'T THINK y COULD LEARN RADIO THAT WAY -- BUT THEY'LC SEND ME A SAMPLE LESSON FREE. GUESS I'LL MAIL THE COUPON AND LOOK INTO Lot OF GooD MONEY- (& MAKING OPPORTUNITIES IN RADIO you how to do Radio repair jobs common in Most every neighborhood. Throughout your training I send you information for servic- ing popular makes of sets! I give you plans and ideas that have made good spare time money for hundreds of fellows. My Train- I famous as ‘‘the Course that pays for tself,’* FREE 64-Page Book Of Facts Mail the coupon now. In addition to the sample lesson, I send my book, “Rich Re- wards in Radio." It tells you about my Course, what others who have taken it are doing and earning. This offer is free to any ambitious fellow over 15 years old. Find out what Radio offers you without the slightest obligation. ACT NOW! Mail coupon in an envelope or paste on a iç Postcard, J. E. SMITH, President, Natlonal Radio Instltute, Dept, GEH, Washington, D. C. POPE n ALSO SENT ae a——— me a mp m mm m m J, E. SMITH, President y National, Radia Institute, Dept. SEH ashington, D. C. l I want to take advaniage of your offer, J Sample Lesson and your book, I i Name Address Clty State RADIO. MINE NEVER SOUNDED BETTER ONLY A FEW MONTHS AND VM ALREADY MAKING MONEY IN MY SPARE TIME. THAT'S $0 AM t. I'M MAKING GOOD MONEY Now AND WE HAVE A BRIGHT FUTURE AHEAD IN RADIO OH BILL. I'M SO GLAD YOU SENT FOR THAT FREE LESSON AND PROVED TO YOUR- SELF THAT YOU COULD LEARN RADIO AT HOME Without obligating me, send me your Free l l “Rirh Rewards in Radio.” i (Please Write Plainly) I I l I Thank You for Meutioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 3

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PRICE MAY, 15 CENTS 1936 SAME PRICE & INVENTIONS MAGAZINE Volume XVI CONTENTS SPECIAL FEATURES H. G. Wells Photographs the Future in “Things To Come” - >. 8 By Donald G. Cooley Feeding America’s Appetite for Games - By W. A. Swanberg He Made Sky Mapping a Big Business - (The Story of Sherman M. Fairchild and His Aerial Camera) By Richard H. Parke $1000.00 Cash Contest— Me Tou Know Cars? . - Docking the Normandie With the New York Tugboat Fleet - = = @ By James Dyson When Hollywood Stars Turn to Hobbies By Howurd Sharpe Outshooting the Guns of Gangland a By Sterling Gleason Floods—Winter’s Devastating Aftermath By Ivan Houk Amateurs Capture Action for the Newsreels = 2 = 3 c 5c By Maxwell R. Grant Fly Rod Fishing for Small Mouth Bass By Robert Page Lincoln Linoleum—Another Industrial “Accident” - 3 = ae =z Packing Thrills in a Motoreyele T. T. Track =- > =e žá a By Walter E. Burton 35 40 44 48 52 56 60 64 68 74 82 86 Next Month — A Camp Trailer You Can Build At Home You won't be able to resist building “Cruisemite,” the latest addition to MM's trailer family. She is so compact and well balanced that she seems part of the car t is drawing her, while her interior is roomy and packed with conveniences. So simple are her plans that anyone can build her. Don’t miss her in the June MM. ALSO IN JUNE — SPECIAL FEA- TURES AND KINKS FOR THE HOME OWNER AND HOME BUILDERS. SHORTER FEATURES You Can Shout 15 Miles in Arctic - - - - 84 New York's Vertical High- ways Total 1700 Miles - - 43 Meet Toonerville’s Inventor— Fontaine Fox- - - - - 51 All-Electric Home Sets New Living Standard - - - - 70 Super-Speed Turbo-Plane to Span Ocean - - - - - 73 What New Inventions are Needed? $50 in Cash Prizes 77 Glass Fabrics Startle Experts 78 Home Scientists Banish Was Day Blues- - - - 80 HOW-TO-BUILD FEATURES A Studio Type Microphone for the Amateur - - - - Plans for Little Bear—A Math Class Racer - - - Kitchen Utensils Make Professional Photo Enlarger 99 “Chinook” A Midget Gas Engine for Your Model - - 100 By Weston Farmer [Continued on page 6]

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0... NOW IST IGHT now, in many lines there is a search for really good men— managers, leadcrs—men who can take charge of departments, businesses, branch offices, and set things humming. As always, there are not enough ordinary jobs to go "round—but rarely before in the history of American business, has there been so much room at the top! New 30b are being created by the business pick-up in almost all lines. „ Ordinarily, there would be plenty of men to fill these jobs—mcen in junior positions who have been studying in i time. But most men have been letting their training slide during these dark years of depression . . . ‘‘What’s the use?’’—You have heard them say. Perhaps there has been some excuse for sticking to any old kind of a job one could get the past few years—but the door is wide open Tor the man with ambition NOW! | . And don't let anyone tell you that “Opportunity Only Knocks Once”—that’s one of the most untruthful sayings 4year later — -d stayed late at the — [hots.sw office, Honey, to get off: : Ay last ex- hats.swell, Wee uc E TIME!. ever circulated. Opportunities flourish for every American every day of his life. Far more to the point is to be rcady—-be prepared—to make yourself interesting to the big-time employer—and LaSalle offers you a short-cut method of qualifying for opportunity jobs in accounting, law, traffic, executive management, and kindred occupations. LaSalle Extension University is 27 years old—40,000 students enroll annually—60 Amcrican firms each em- ploy 500 or more LaSalle-trained men—surveys show that LaSalle students attain 40% average salary increase after graduation—10925 of all C. P. A's in the U. S. A. are LaSalle-trained—in two states over 60% of the C. P. A's. aro LaSalle-trained men. Why not find out what LaSalle has done and is doing for men in your position? Send and get the facts; see what LaSalle can do for you, personally! There’s no question about it—business is picking up— jobs are looking for trained men—the time has come for you to qualify for prosperity. Mail this coupon today! LaSalle Extension University, Dept. 5493-R, Chicago. Kindly send me your free booklet on the business field I have checked—and tell me how your training in that field can help me. O Business Management DO Business Correspondence DO Business English OTraffic Management Address. O)Salesmanship OLaw DAccountancy (QO Bookkeeping OCommercial Law LASALLE EXTENSION UNIVERSITY Thank You for Meutioning Modern Mechanix end Inventions Magazine When Writing to Advertisers 5

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"Ls WEEKS AGO this black, tarry-looking substance, that you wouldn’t buy at any price, was a fine high grade oil... taken out of a sealed can and put in the completely drained crank- case of an engine that was not protected by an oil filter. Today, this once fine oil has already begun to develope sludge... and to accumulate the dirt and grit and hard carbon that always find their way into an engine. These harsh, destructive substances are sources of costly replacements and repairs... for they are carried by the oil stream into closely fitted moving parts, where they grind away at valves and cylinder walls and bearings. If you are driving one of the many millions of cars that were protected with a Purolator Oil Filter at the factory, your oil will continue to be a fine, clean, effective lubricant, and will even retain its color after thousands of miles of driving. There are just two things to remember. First, YOUR PUROLATOR MUST BE RESERVICED AFTER ABOUT 8000 MILES That is because its reservoir has become so full of the destructive sludge it has removed that it will hold no more. Second, Be Sure You Get a Genuine Purolator Refill That is because it is the overwhelming choice of automotive engineers...as is attested by the fact that 91% of all filter-equipped cars during 1935 left the factory carrying GENUINE Purolators. Your garage man will give you this service white you wait. Ask him about the Purolator. He knows. Motor Improvements, Inc., 365 Frelinghuysen Avenue, Newark, New Jersey. PUROLATOR The Oil Filter on Your Motor Car LICENSED UNDER SWEETLAND PATENTS CONTENTS—Continued from page 4 Power Saws Built from Scrap Parts - - - 105 Captive Model Planes Become Flying Kites - 106 By Dick Cole Old Phonographs Make Useful Furniture - - 109 Make These Novelties With Rainbow-Hued Plastics - - - - - - = = = = - 310 By Dale R. Van Horn NEW MECHANICAL INVENTIONS Giants of Sea and Air Vie for Honors - - - 39 New Plane Rises Like Autogyro - - - - 42 Electric Eye Tests Auto Lights - - - - - 42 Locomotive Dons Streamline Dress - - - 42 Wind-Tunnel Auto Foreshadows New Airship 47 Vacuum Cleaner is Shop Tool - - - - - 47 New Respirator Aids Miner's Safety - - - 47 Street Cars to Follow Bus Design - - - - 47 Music Students Aided by Gadgets - - - - 50 Elevator Grades 1700 Eggs an Hour - - - 50 Automobile Exhaust Helps Fight Fire - - - 54 Ancient Cotton Spinner Run Again - - - 54 Mechanical Tornado Powers Barrel Plane - 55 Diesels Speed Travelin Argentina - - - - 55 Rolling Tripod Aids Movie Making - - - - 55 Youth Builds Powerful Telescope - - - - 58 Shop Travels to Scene of Work - - - - - 58 Mail Carried by Rocket Plane - - - - - 59 New Glass Bends Like Celluloid - - - - 59 Senate Subway is Safest in U. S. - - - - 59 Exhaust Heats Airplane Wings- - - - - 62 Baby Carriage Has Stair Climber - - - - 62 Formula Found for Synthetic Ice - - - - 63 Excavator Moves 900 Tons Per Hour - - - 67 Portable Gin Mounts on Truck - - - - - 67 Piano Folds into Buffet Cabinet - - - - 67 Models Tested in Wind Tunnels - - - - 71 Radium Made in Million-Volt Tube - - - 72 Robot Bookkeeper Actually Thinks - - - 72 Tiny Engines Propel Model Planes- ~ ~- - 72 French Mail Plane Crosses Atlantic - - - 76 Cocoanut Novelties Prove Profitable - - T6 Machine Separates Atomic Twins - - 79 Small Air-Conditioner Saves Fuel - - - 79 Thin Vanes Form Non-Skid Tread - - =- 79 Device Fits Gloves Scientifically - - - - 81 Road Magnets Cut Flat Tire Toll - - - - 84 Small Airliner is Fastest in Service - ~ - 85 New Safety Glass Bends on Impact - - - 88 [Continued on page 8] 6 Thank You for Mentioning Modern Mechaniz and Inventions Magazine W hen Writing to Advertisers

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NGI wiTH A GR rs this fascinating . : ove a in Electrical Engine od the way to € zen or The n : Ere just starling or 0:9 ie knowledge necessary field thoroughly. T Waustry this course brine? ston in this : ing position in adv ancement. AL E REAT INDUSTRY jumph 's supreme inum : y represents man d. Many are ombustion D are in great goma “tudy oí this . Diese h spare- tl ary knowledge UP. Send for free bookle le A COM The internal-c of machine power iri cess cquiring ne ood L C. S. Course on OMOB | e A e X ARE ALWAYS ce of the modem automobile . C en. : facture and servit d iorward-looking me As The rapid progress in a'to thousands of ambire o, T, C. S. Au PA brings new oppor “a mand for trained men se 's always a de 1 The time to act js now. * men rds for trained ities created ere . The opportunities s giant mie prepared by lead Write today for a fasci- great rewa RADIO holds i a e radio has ee 1. C. S. Radio 4 1 you a trained man: i d Almost in a deca i i will þe enjoyed bY trained men. ing authorities. will help make nating. FREE book. INTERNATIONAL CORRESPONDENCE SCHOOLS BOX 2322-G, SCRANTON, PENNA. * — Without cost or obligation, please send me a copy of your booklet, “Who Wins and Why," X and full particulars about the subject before which I have marked X: [C ELECTRICAL ENGINEERING (DIESEL POWER O RADIO [] AUTOMOBILE EXPERTS TECHNICAL AND INDUSTRIAL COURSES O Structural Draftsman O Mechanical Draftsman D Steam Llectvic Engineer D Surveying and Mapping D Structural Engineer i i O Machinist L] Marine Engincer O Coal Mining O Mine Foreman How to Invent and Patent O Toolmaker OR. R. Locomotives D Navigation L] Mechanical Engineering D Electric Lighting LI Welding, Electric and Gas OU Reading Shop Blueprints O Boilermaker L] Business Management D Office Management O Industrial Management D Trafic Management OD Accountancy LJ Cost Accountant L] Patternmaker O Gas Engines DO Aviation Engines D Air Conditioning O Refrigeration OD R, R. Section Foreman O Air Brakes OR. R. Signelmen UO Highway Engineering QO Civil Engineering BUSINESS TRAINING COURSES D C. P. Accountant O Bookkeeping Ul Secretarial Work O Spanish D French U Salesmanship O Service Station Salesmanship O First Year College D) Business Correspondence OD Lettering Show Cards © Signy D Stenography and Typing D Civil Service D Mail Carrier D Cotton Manufacturing O Woolen Manufacturing D Agriculture D Fruit Growing L] Poultry Farming Railway Mail Clerk D High School Subjects O College Preparatory O Advertising D Illustrating D Cartooning If you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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RESET LOOSE Fixtures with Plastic Wood HANDLES LIKE PUTTY Now you can quickly and easily reset loose bath- room fixtures, loose tiles, seal unsightly cracks around bathtubs and sinks, seal floor or baseboard cracks, for only a few cents—with this wearproof, waterproof Plastic Wood. Just press this putty-like preparation into place and it dries quickly into hard, permanent wood. USE THE GENUINE Genuine Plastic Wood is actual wood in putty form, when dry it is hard wood that can be sanded, sawed or carved—will hold nails and screws per- fectly—will adhere to any clean, dry surface— wood, metal, porcelain or plaster—can be painted, varnished or lacquered perfectly. Genuine Plastic us is waterproof, weatherproof, and grease- proof, Ask for the Gen- uine Plastic Wood— sold at all leading paint, hardware and variety stores. Comes in nine different colors. Start in Spare -Time— Earn Up to $2 to $3 an Hour “Am still operating my Foley Filer after 5 years. Busi- ness better than ever this year," reports J. W. Vieth, Pa. The FOLEY Automatic Saw Filer files hand, band and circular saws perfectly, quickly. Used by leading saw manufacturers —Atkins, Disston, Simonds—also repair shops and industrial plants in every state, s No Experience Needed No eye straln. All cash business, no canvassing. Send postcard for FREE plan, no obligation. (Approved for loans under National Housing Act.) FOLEY MFG. CO., 517-6 Foley Bldg. 11 Main St. N. E., Minneapqtlis, Minn. E CONTENTS—Continued from page 6 INTERESTING SCIENTIFIC ITEMS Flame in London Opens U.S. Museum - - Barney Oldfield Gets Odd License - - - - Auto Driven to Western-Most U. $. - - - Movie Gliders Break Flying Records - - - Rubber Used to Furnish Entire Room - - - Sun’s Heat Surpassed by Electric Are - - - Show First Diesel at Museum - - - - - Plants Grown Without Earth in Jar - - - Next Four Years to be Wet and Colder - - President Has “Official Forger" - - - - - Texas Centennial Shown in Miniature - - Dust Powder Builds Up 450,000 Volts Mirror Checks Faults of Oarsmen- - - - Pontoon-Glider Stunted by Youth - - = Carrier Pigeons Turn Cameramen - - - Camera Brings Surveyor’s Field Indoors FOR THE WORKSHOP FAN Kinks Suggested by MM Radio Experimenters Practical Ideas for Shop Use - - - - - Reading Your Home Meters for Profit - - - Preparing the Home for Spring - - - - Inlay Projects with Sawdust Paste - A Clothes Rack for Junior's Room - - - - Electric Magic Box Stumps Magicians - - Celluloid Improves Carbon Copies - - - - Practical Ideas for Everyday Use - - - - Electric Hammer Designs Metal - - - - Dancing Ducks are Easily Made - - - - DEPARTMENTS Solving the Readers Problems - - - - - Random Chips from the Editor's Workbench Nie Sprank - - - - - - - iuis E Paragraph Oddities - - - - - - - - Sportsman's Campfire - - - - - - - Radio Sparks - - - - - - - - - - Business Ideas - eh ee ee 39 50 54 58 62 63 63 7 16 81 84 84 85 88 91 92 98 108 108 112 112 113 114 114 14 20 34 66 14 89 146 Published monthly by Modern Mechanix Publishing Co. at Broadway and llih St., Loulsville, Ky., U. S A. Entered as second- elass matter under the act of March 8, 1879, at the post office in LoultsvllIe, Ky., with additional entry at Greenwich, Conn. Copyright 1936. Editorial offices: Fawcett Building, Greenwich, Conn. Not responsible for unsolicited nianuscripts. Contributions accompanied by insufficient postage will not be returned. In U. S. and_Vossessions and in Canada, 15 cents @ copy; $1.50 a year. Other Postal Unions, $2.00 a year. Printed in U. S. A. Advertising forms close the first of second month preceding date of issue. Advertising offices: New York, 1501 Broadway; Chicago, 360 N. Michigan Ave.; San Francisco, Simpson-Reilly, 101¢ Russ Bldg.; Los Angeles, Simpson- Reilly, 536 S. Hill Si. General business offices, Fawcett Building, Greenwich, Conn, Member Audit Bureau of Circulations William Kostka A Neely Hall Fditor Workshop Exnerl Robert Page Lincoln . S. Rabl Hunting and Fishing Editor Naval Architect 8 Thank Vou for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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IF YOU WANT TO MAKE REAL MONEY TRAIN FOR A BIG-PAY JOB IN ELECTRICITY | | 30, 440, '50 ,,;UP A WEEK, EARNED BY MANY Y don’t care whether you are 16 or 40, don’t waste the best years of your life in a low-pay job that leads to no-where, or worse yet, never knowing whether you will have e job from one day to another. Get into a fleld with a future... a ''live"* industry that offers steady, interesting work and good pay for men with PRACTICAL TRAINING. Many trained men make $30-, $40- and up to $50.00 a week A and more every week in Electricity. Stop WISHING for a good job, and TRAIN for one... in ELECTRICITY! PLL FINANCE YOUR TRAINING? Tf you are short of ready cash, don't let that hold you back. My plan that has enabled thousands of deserving fellows to get Coyne Training first... then pay back their tuition in small monthly payments extended over 18 monthe after graduation starting b montha from date they start school or 2 months after their required training period ia over. Meany have told me that their training more than paid for itself out of Increased earnings! Just prove to me that you are really ambitious to succeed—by malling the coupon below—and VIl send you full detalls of 2 this amazingly liberal effer without . — 4. NOT A CORRESPONDENCE COURSE “Toes of 6 Bor Learn in 22 Weeks in Coyne Shops! EMPLOYMENT SERVICE My great training shops in Chicago are known the world After you graduate, my Employ- over for the amazingly easy, practical method we use in training ambi- ment Department gives you every poB- tious feilows for big-pay Electrical jobs in only 12 weeks. You learn quickly sible aid in placing you in the kind of by doing actual shop work on real Electrical machinery—without book study or job for which you have been trained. useless theory. Previous experience or a lot of book learning not necessary. This service is yours for life—any time Expert instructors guide you every step of the way. Start any time, you ask for it—at no extra cost. e DIESEL ENGINES RHEYSEMASNAS rea Ene PME If you need part-time work to help Trained men are needed in these rapidly P de osebest te heb vou. Many d ü i you. any Oo TRAIN for | "ists dejes ie amence, gur students have availed themselves of Jobs Like These Right now I’m including instruetlon in Diesel e extra service which is entirely free. Diesel Operator Engines, Electric Refrigeration and Air Con- Armature Expert Substation Operator GET THE FACTS — NOW! ditioning AT NO EXTRA COST. Auto Electrician The whole fascinating etory of thipamez- inglyeasy, practical way tolife-succesa HERE’S PROOF... Inventor—Mainte- That Coyne Training Gets QUICK RESULTS! nance Engineer t “On my first application I informed the com- Service Station pany that I was a graduate of Coyne .... 1 Owner- Refrigeration got | the. jen i AS. V. OATES, Missouri ; itioni "Thanks for yourletter to the.. .. Company. znd Air Conditioning The day they got the letter they called me and offered me a position of manager.'" JOSEPH W. POTTER, Utah **I wrote to Coyne School recently for a recom- mendation for a position with the . . . . Power Company. I received the position.” LAWRENCE McBEE, Tennessee COYNE 2 599 S. Paulina St., Dept. 56-53, CHICAGO, ILLINOIS Js yours for the asking. Just mail the €oupoa aad I'll gend you my big Free 48-rege Book of Electrical opportuni- ties, with phot making facts, raphs,jobsandmoney= here's no obligation— and po salesman will calt on you. RUSH THE COUPON TODAY H. C. LEWIS, President Coyne Electrical School 500 S. Paulina St., Dept. 56-53, Chicago, IL Without obligating me, send Free Book and details of your “‘Pay-Tuition-After-Graduation” Plan. Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 9

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INVEN O BE successful as an in- l ventor, you don’t need to be an Edison who took out 1099 Patents before he died, or a C. F. Kettering, who helped develop the Self-Starter, Duco, Ethyl Gas, and other outstanding inventions, and is today the famous head of the Research Division of the General Motors Corporation. In fact, you don't need to be known as an in- ventor at all, if you have a prac- tical, useful, salable invention—or an idea for one—and go about it right. Remember that for every Edison or Kettering, for every McCor- mick, DeForest or Atwater Kent— there have been thousands of un- known men whose inventions helped along the wheels of prog- ress and helped the inventors fi- nancially at the same time. Many Little Ideas Have Big Commercial Possibilities For example, who knows the name of the inventor of the wooden golf tee, the ordi- nary crinkly hair pin, or the metal ball or disc that the average housewife uses for scouring pots and pans? Who knows the inventors of the thousands of gadgets that you will find in the ten-cent stores, in the modern drug and department stores? Some day, stop and look at some of the simple articles you'll find on the counters of a ten- cent store. Notice how many of them are marked Patented or Patent Applied For. It is an interesting, educational experiment. These inventors, most of them, weren’t of the genius class, They simply got an idea for doing something in a better, easier, faster, or more economical way-——AND THEN DID SOMETHING ABOUT IT. 10 Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers Interesting Points fs today’s “champion in- Who ventor’’? Ans.: John F. O'Connor, of Chicago, IIl, holds 949 Patents, more than eny other living man. Who is “Lady Edison”? Ans.: Miss Beulah Louise Henry of New York City leads all women inventors, holds fifty patents; is known as “Lady Edison”, What Is an improvement? Ans.: Nearly all inventions today are improvements over earlier in- ventions. Often the improvement proves more profitable than the earlier invention. Is a model necessary? ` Ans.: Today, most inventions are patented without models. A subject fully explained in our book. What Is the prellminary search? Ans.: The preliminary- search is ordinarily the first step to help an inventor. Also fully explained in our book. Send for a copy today. A New Book About Selling inventions There are two sides to every inventive You may be able to do as well as others who have been successful. That only time can tell. But there is one thing you can do, and do now, without waiting on time. You can find out easily and quickly exactly what to do to protect yourself. In the 48-page book, “Patent Protection” shown on the opposite page, which will be sent to ycu FREE, we tell you what many other in- ventors have done, just what you yourself must do to make Application for a Patent, give you interesting facts about inventive history, show you 115 mechanical move- ments that inventors have used in working out ideas, and much more. Decide now to get a copy of this interesting book. Its facts can be worth much—yet they cost you nothing. success: The inventive side and the com- mercial side. A good invention poorly handied, can prove a failure commercially, An ordinary invention, properly handled, can be made a money-maker. In the special booklet, shown here, we give you some sug- gestions on “When and How to Sell an In- vention”; practical hints on the commercial side of inventing. We'll send this new booklet along with the hig 48-page book, ‘Patent Protection” illustrated on the next page. Use the convenient coupon to request your copies.

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YOUR QUESTIONS. ANSWERED! Thes are = ! lot of ques- tions that the average man with an invention, or an idea for one, wants answered before he goes ahead. Here are a few of them that most inventors put up to us: How do the Patent Laws protect me? What easy steps can I take, without cost, to put myself in position to sup- port my belief that I am the first man to think of my invention? Is a Patent worth the cost? MAIL THIS. ' COUPON TODAY Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 11 a 1 Other Ofices: Bldg., San Francisco; 730-B Security Bldg., Los Angeles. Send me FREE copies of your hooks “Patent Protection’ and ‘When and How to Sell an Invention.” offices listed above.) Name ......eesoosonotoetososeeeonas Street and No, ..... City or Town ... You may not be an * Edison or a Kettering E but still you may have a good idea Should I try to sell my invention before I have it Patented? Is there any safe, business-like way to secure financial help? If I do apply for a Patent how shall I reach people who can mar- ket my invention? Can I protect and sell an improvement on some invention that has al- ready been Patented? These are but a few of the questions which usually confront the aver- age man. You need the answers! YOU CAN HAVE THEM, without cost, trouble, or delay. . . Our Business is To Help You—Write Us Today For more than thirty-seven years, this firm has been helping men with an inventive turn of mind. We maintain a large staff of trained, experienced specialists—Registered Patent Attorneys, Drafts- men, and Searchers to help our clients secure all the protection to which they are entitled. Fees are reasonable, Deferred payments frequently arranged, Questions 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 shown on these two pages. ‘They are filled with facts, pictures and suggestions. ‘hey tell you things about Patents, Inventions and Selling Inventions that we have learned in our Iong experi- ence. They may save you time, expense, EVEN LATER DISAPPOINTMENT. Simply fill iu the coupon or write us a confidential letter. No charge, no obligation. Mail the coupon today. Co. VICTOR J. VANS & = RECISTERED PATENT ATTORNEYS MAIN OFFICE: 720-E, VICTOR BUILDING, WASHINGTON, D. C. 1445-D, Monadnock Bldg., Chleago, iil; 1007-B. Woolworth New York; 514-B Empire DPlds., Pittsburgh; 1010-B Hobart Bldg., (Note; Same books supplled by any of branch peovesosevsesoovosevesosedovettteceveeccctoscotovoeT a!

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IVER JOHNSON The last word in smooth, easy riding, safety, beauty, long service and expert workmanship. Send for color folder 64B showing America’s greatest bicycle values and complete details of many snappy models and folder 64A on Shotguns and Rifles. IVER JOHNSON’S ARMS & CYCLE WORKS 23 River St., Fitchburg, Mass. New York San Francisco 65 Chambers St. 731 Market St. 65 Years of Progress Montreal Coristlne Bldg. This Profession Now Open to More Men and Women Fascinati Fr Profit&ble, Easy to Learn: Swedish Massage is an un- crowded profession. Salaries from Hospitals, Clubs, Sanitariums range up to $40 and $50 per week. Hun- drede go in businessforthemselves. LEARN AT HOME Home Study lessons by teachers in our swell known resldence school tn Chicago. Seme diploma awarded upon com- pletion of course, ny finish in three months. Anatomy charts & supplies included. ‘Waites or details & copies of letters from graduates. NATIONAL COLLEGE OF MASSAGE AND PHYSIO-TRERAPY 20 North Ashland Avenue Dept. 558 Chicago, Illinols To Earn More Money in AVIATION Train at ay Start your aviation tralning wlth the 1 determination to be among the $200 lo $500-a-month Pilots and mechanics. B Come to LINCOLN where you get Approved Training and the practical experience which qualifies you for better pay jobs. Government Approved School. Flight Course gives you required training for Government Pilot's license. Mechanic's Course gives you required training for Government Airplane and Engine Mechanic's Tieense, I'inest modern equipment. IIigh class Instructors. Factory anethods, combined with shop and laboratory practice, make learning easy and thorough, Individual instruction for rapid, more thorough aeronautical education. Now In 26th year; 16 years teaching aviation. Many graduates ci mploye ed by best known airlines and factories, Thou- sands of jobs ahea tart tralning at Lincoln now for successful avi- ation career. Speci part-time employment offer for a few men who ean start training this summer. WRITE today. State age. Lincoln Airplane and Flying School 45 Aiserstk Gis: SUPPRESSED KNOWLEDGE OF THE AGES 7 ancients possess? Where was the. a | source of knowledge that made it possible for them to perform miracles? Were these pro- found secrets burned with ancient libraries, or are they buried beneath crumbling Temple walls? These wise men of the past knew the mysteries of life, and personal power This wisdom is not lost—it is withheld from the , mass. It is offered freely TO YOU if, with ` an open mind, you wish to step out of the rut of monotonous existence and ) MASTER YOUR LIFE. THIS FREE BOOK Man's intolerance has at times swept his achievements from the face óf the earth, yet y secret brotherhoods have preserved this sace P wisdom of the ages. The Rosicrucians, FEES A one of these ancient brotherhoods, INVITE D: YOU to write and secure a free copy of “The A, may receive age-old truths. You can learn to MAKE YOUR LIFE ANEW—the à fulfillment of your ideals awaits you. Address: Scribe H. D. K, Regardless of strength or size defend yourself and friends against'any foul attack, from. € bullies or by gun, knife or * club. Subdue with ease persons much stronger than yourself. A complete course on approved American Police Jiu-Jitsu by Internationally known police Instructor. 15t illustratlops with detailed Instructions pocket size, 13 knockout blows without using fists. Bend P Dollar Full ar N C O D, JORGENS S. J s 713] Maritime Building EN Washington 4 125% Profit for Agents PRESTO-WIND PROOF REAL OUTDOOR LIGHTER Can be lit In flercest wind, Perforated Chimney does the trick. A press and it’s lit—Release and it's out. Everyone who smokes out of doors is a prospect. 2 Retalls $1.50. Sells to the Polished Nickel. í oye ent at $9 a dozen. Sample 75c. Sample 1 omium Plated $1.00. NEW METHOD CO. Box M-41, New Method Bidg., BRADFORD, PA. LOOK! “Rir-King Rocket Chute!" The world's greatest toy Durable metal rocket Sturdy rubber sling 14-Inch parachute Easy to raise 150-250 ft. Send only 15c in coin to cover cost, packing and mailing. GEO. N. EWEN CO. 18-80 No. La Salle St, Aurora, I 12 Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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Train at Home---Under Factory Engineers Tor GOOD PAY Sj Appointed by Radio Manufacturers to Supervise R-T-I m P Training This is the R-T-I Advisory Board—Engineers and Execu- tives of large Radio firms—appointed by these firms to supervise and direct R-T-I Training. d 50 great radio manufacturers now endorse this Training. hands. RAY D. SMITH PRESIDENT R-T-I Who has directed training of 100,000 men. Read what a few students say. oe # “Made my first spare time money after fln- ishiug four lessons, Over $500 spare time money in 10 months. R-T-I Is 0. K.” Delmar Grote, Route 5, Greenrille, Ohio e + + “I made $14.25 in first 11 days of my training following your instructions.”” C. E. Head, 431 Third St, Alexandria, La. + + & “Before finishing my training I was made Manager of a Depart- ment Store’s radio section.” Howard N. Lentz, 123 W. Alexander St., Buchanan, Mich. Hoe k "My job pald me $18 a week before taking your training. Shortly after starting — was averaging $60 a week. Have made as high a3 $250 in single week.” Wm. T. Ridd, 8152 Evelyn St., Verdun, P.Q. Canada Put your future in their TRAINED: MEN NEEDED IN ALL BRANCHES If you're dissatisfied with small pay—lay-offs and an un- certain future—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 pick 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 ate thousands of such jobs today—many paying even more. And new jobs are being created all the time—full time jobs and spare time jobs. Get my book and see how easy it is to learn at home for this good-pay work. "SHOP TRAINING" FOR THE HOME R-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 vacuuni-tube devices are made. It was planned and prepared and is supervised by big radio engineers IN these factories-——by men appointed for the purpose. his means that trained the R-T-I way, you'll be trained as the Radio Industry wants 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 R-T-I Train- ing. From there it will take you through the whole field of Radio and Electronics. You will learn about every new development, including Television so you'll be ready when Television breaks. You'll also learn the big money subjects Such as Aviation and Auto Radio; Public Address Systems; how to handie Photo Cells; Sound Picture Recording, etc. . 4 WORKING OUTFITS FURNISHED Start almost at once doing part time radio work. I furnish 4 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 tan master it. [t 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-| Training is different, Find out why H-T-] Trained men get “Quick Results’ and “Big Re- sults.” Send for your copy of “Radio's Future and Yours" today. It tells you about Radio’s amazing opportunities. It describes my approved tralning, ft tells what R-T-1 students are dolng and making. It gives the names of my Advisory Board and 50 endorsing manufacturers: It's FREE. Clip, sign and mall coupon RIGHT ow! RAY D. SMITH, President RADIO AND TELEVISION INSTITU Dept. 35 2150 Lawrence Ave. Chicago are-lime and Full-Time Jobs RADIO LEARN TO EARN Yo > 75 WEEK (MANY R-T-I TRAINED MEN EARN EVEN MORE) Mail Coupon Below Big Money in s Auto and Police Radio Work W. T. Carr, 402 N. 16th St, Kansas City, Kansas, an R-T-I student, has eharge of 35 radio cquipped cars for tho Kansas City Police and Fire Departments. llis salary is $230.00 a month and he is furnished with an automobile, gas, oll, ete. He says, “If I had nof taken your course I would not be able to hold this job.” Makes $600 in One Month Herbert B. Thomson, Gorman, ‘Texas, formerly an oil well driller, borrowed $170.00 to start a spare time radio business after completing 12 R-T-I lessons. He made money from the start. In two years his shop was worth $3500. He says, ‘Because of my R-T-I Training I made $150 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-D 2150 Lawrence Ave., Dept, 35, Chicago, ti. Without obligation, send me a copy of “Radio's Future and Yours.” I am in- terested in your training and the oppor- tunities 1n the great field of Radio for the R-T-I Trained Man. OLY cae te naden vows ier es Bale eere ere Thank You for Mentioning Modern Mechaniz and Inventions Magosiue When Writing to Advertisers 13

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Your Questions Answered By M M's Editors CHANNEL FRAME FOR TINY TOM Can brass channel be substituted for the frame of Tiny Tom model locomotive? What is the best wheel thread dimension for 00 gauge? Where can I get drive wheels? —A. E. T., New York. Brass channel, 546” wide with 34” sides, a standard size, can be substituted on MM's Atlantic type 4-4-2 locomotive. If channel is used, it can be bolted to the tank under the front end of the boiler and to the firebox with 2-56 machine screw. The rear screw can also hold the trailer truck. An 00 gauge authority suggests that a wheel tread of 47/64” would insure most satisfactory running conditions. Builders of Tiny Tom can get better play for 00 gauge by making the back to back flange dimensions of the drive wheels and the shouldered axles 43/64” instead of the 11/16” shown on the drawings. An advertiser of 00 gauge supplies in MM’s classified columns can furnish the drive wheels for Tiny Tom. AN EASY PULLING AUTO TRAILER I am interested in an auto trailer that will have a minimum of wind resistance and one which will not prove too difficult to pull. Can you advise a trailer that will come near these requirements?— R. A., Lubbock, Texas. We believe that our ALOHA trailer will best meet your demands since it is not only easy to pull but partially streamlined as well A trailer of this type can be con- structed for about $200. Plans for this trailer can be obtained in blueprint form at $2.00 per set. RECLAIMING KELP FROM THE SEA In your March issue there appeared a very interesting article on kelp farming. While no mention was made of the kelp to be found in the Atlantic Ocean I am wondering if it is the same 14 as that in the Pacific as I should like to use it for poultry feed. Living near the ocean I have access to large quantities of this sea plant —F. M., Union Beach, N. J. At present the nation’s commercial supply of kelp comes from the Pacific Ocean since it is superior to that found in the Atlantic. From this plant comes a number of valuable drugs which are important to growth. So far sea weed in the Atlantic has not been put to commercial use as drugs or food. ALTERING CONSTRUCTION OF “SCRAM” I recently constructed your boat, SCRAM, and am well pleased with it. Using a converted auto- mobile motor it planes with four people in the front seat. Now, as I wish to use this craft chiefly for fishing is it possible to move the engine ahead about 18 inches to provide more room? —W. J. W., Falconer, N. Y. We strongly advise against any changes in MM boat designs. If this is done you lower the angle of the planing surface losing most of the lift. As MM boats are in most instances first constructed in miniature the designers are able to determine the best location of the motor and arrangement of other details so as to insure best results. When the model's engine was moved ahead the boat steered badly and was also light by stern. MAKING VESTPOCKET RECEIVER COILS What is the correct wire to use in winding the Vestpocket receiver's coils as described in February, 1936 MM.—L. A., Reno, Nev. Wind plate and grid coils with No. 30 en- ameled. Antenna with No. 20 D. C. C. (Editors Note: Your questions will be answered per- sonally and free of charge by MM experts provided they do not require special reseurch 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 envelope for reply. Address: Problems Editor, Modern Mechanix Publishing Co., Greenwich, Conn.)

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GREAT NEWS, FELLASS MY UNCLE. WALT WILL. HELP OUR CLASS MAKE A MOVIE! AND HELE LOAN HIS CAMERA ~ PROJECTOR ~ EVERYTHING UNCLE WALTS GOT IA A SPECIAL CLOSE-UP / NO CLOSE-UPS LENS ~ Now YOU, OF ME ~ NOT DAVE, I EXPECT WILL BE THE Little sister Florrie helps Dave to star in the high school movie... GRANNIE ~ THEY WANT LAND SAKES, CHILD Wy INU T DAVE FOR TUE HERO JUST A MINUTE, PLEASE/ GRAN jun" FLEISCHMANN'S FLORRIE / y Svo THIS FRESH YEAST TAKES YEAST IS THE THING IM Bus! | PIMPLES AWAY. tT MIGHT, EVEN HIS GIRL 15 TO BE FoR PIMPLES/ ILL! F mr] IN TIME FOR THAT MOVIE. OH HEROINE / BUT DAVES } GET YOU SOME FOR | Bl 1E TRY ITS : GOT TERRIBLE X HIM TO TE PIMPLES / START ON Don’t let Adolescent Pimples keep YOU out of the limelight After the beginning of ado- lescence—from about 13 to 25, or even longer, impor- tant glands develop and final growth takes place. This causes disturbance through- out the body. The skin gets oversensitive. Waste poisons |} in the blood ir- ritate this sen- sitive skin. Pimples appear. Eat Fleischmann’s Yeast to clear these skin irritants out of the blood. Then, pim- ples vanish. Start eating 3 cakes a day, before meals— plain, or in a little water— until your skin clears! » clears the skin by clearing skin irritants out of the blood Copyright, 1936, Standard Brands Incorporated Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 15

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The Most Sensational Business Opportunity Since 1929 Like turning lead into gold, here isa business with gigan- tic possibilities. Factories, Glubs, Stores, Schools, Homes, spend millions every year for rubber mats, Think of your profil when a HAND MACHINE and e TIRE MAKES Brand new. Fully patented. t report unprecedented success, Wm. Eagle writes, “Can't make mats fast enough. First week brought ever 200 orders for $!.00 to $10.00 each." Flash from Harris says: “Orders enough to keep 15 men busy all the time. Gunter got big order from £ County Commissioners and now reports: ‘‘Just A signed up order for all grade and high schools, No wonder responsible men are throwing everything aside to establish local 4 FABRIX factorles. COSTS NOTHING to act complete facts. Just send name and address, We'll send description of simple hand machine that quickly slices old tire into strips; show you how patented method forms strips Into thick, springy, long-wearing FABRIX Mats—how five cents worth of Junk Tires makes $2.00 Mat; how you can start on a reasonable investment and build a business so big, so fast, that it will take your breath away. Don’t delay a minute. Write or wire today. All information Is free, FABRIX, Inc., 325 West Huron St, Dept, 85, Chicago, Ill. $22 MAT Few men already started ILL /zain YOU FOR GOOD Ž SPARE :TIME 2-/ FULL-TIME JOBS IN ELECTRICITY DIESEL ELECTRIC POWER... RADIO REFRIGERATION...AIR CONDITIONING byPRACTICAL SHOP METHODS time RIGHT IN YOUR OWN HOME Get into a growing industry that offers steady work, better pay, real future. Many make $30—$40—$50 a week and up. Revolutionary new plan brings practical training right to your door, Learn at home .doactual jobs in your own electrical shop . we furnish dozens of items of electri- cal equipment at no extra cost with course —rmakes training easy, helps you earn extra spare-time money. EARN WHILE YOU LEARN Ho need 15 give u up your present job until you are trained for an electrical jo! opportunities to make $5, $10 or more a week while training. SEND FOR THIS FREE Book your spare time is enough to learn Electricity the practical E. L. way. Kee right on earning as you learn. You don t need previous experience or a lot of book learning. Money back if not satisfled. Mail the coupon TODAY for big Free Book and all facts about this amazing new plan of home shop training. Thereis no obligation. A H.W. Petersen, President a get aa | x Send Free Book and full details of E. I, Horne Shop Training. i W vame — ~ AG l 1 ADDRESS i i LCT STATE. J Moto-tool for SHOP ... HOME... SCHOOL . . PROFESSION The new D-E Moto-tool grinds, drills, engraves, sharpens, routs, carves, sands, cleans, polishes and does hundreds of Jobs quicker, better and with greater precision. Handles easlly as a pencil— welghs G 0%. Powerful and sturdy as similar tools twice as heavy. 110v, univ. motor—about 20,000 R.P.M. Oilless, self-aligning and ball-thrust bearings Handy built-in, off-and-on_ switch. Easlly replaceable brushes. Universal collet chuck. Hardened tool steel, replaceable spring collets. Shockproof, bakelite housing. You must sce and uso it to appreciate its tremendous value. 10 Day TRIAL Money refunded if not highly satisfied. Write TODAY for free illustrated book, Drome! Mfg. Co., 105 Ct, Racino, Wis. Learn Public Speaking At home—in spare time. Many overcome “‘stage-fright,’’ galn self-confidence, and increase thelr earning power, through ability to sway others by effective speech. Write for free booklet, How to ork Wonders With Worde and requirements. NORTH AMERICAN INSTITUTE, Dept, 2085 3601 Michigan Avenue Chicago, Minos ent Earn Cash at Home! Mrs. M. M, earned $267 in 3 wecks (sworn statement) raising mushrooms for ua in her cellar! Exceptlonal? Yes, but .YOUR cellar, shed, barn may be suitable to bring moderate income. Book, pictures, sample FREE. (Estab. 1908). UNITED MUSHROOM CO. 3848 Lincoln 3848 Lincoln Ave, —— Dept 185 — Chicago Dept. 185 Chicaga ROLLA:STRIPE 12 Stripe automobiles, airplanes models, furniture; use for sign painting and interior decorating. Sturdy, efficient & compact, Anyone can stripe any surface with a ROLL- A-STRIPE. Just roll it along surface to be decorated and there is" the stripe, a real professional job, Ready for use. Speclally knurled wheel makes paint flow evenly. See your Dealer today or send for one direct. Postpald $1.50. Modcraft Industries, Dept. D5, 2908 N. Nordica Ave., Chicago, Ni. 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 aud Amateur Photography. Personal At- tendance and Home Study courses. 26th year. Free Booklet, New York Institute of Photography West 33 Street (Dept. 153) New York GOVT. JOBS [IIT a Ca POSTMASTER ED É Ebo Tr Seamstress TO START R. F. D. Carrier Auditor Special Agent Stenographer E 90 LO) C) Customs Inspector U.S. Border Patrol 5 City Mail Carrier "Telephone Opr- J | 7 ( P. O. Clerk atom tor T tron egt Insn MONTE THLY ¢ Nacia Investigator( ) Seeret Service Opt, © Typist File Clerk MEN.. WOME Age Range 161050 INSTRUCTION SERVICE, Dent, 233, St. Louis, Mo. Send me FRE particalers "dowd to ,Realfy | s. dti. mark le Government poctetitisn, ete. ALL SENT FREE. N&eme.......eeeeseeoo eo ehh tet Address, Loss eene oot 16 Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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“It was a black, moonless tropic night," writes Gardner K. Hussey, “but I trudged along the fa- miliar jungle path in the dark with assurance. It was the path from my timekeeper's shack to the house where I slept. Without warning I stumbled and fell headlong. There was a hissing noise fol- lowed by a sharp click. I scrambled to my feet and reached for the Eveready Flashlight in my belt... Within three feet of me was a huge thrashing alligator, his jaws snapping like castanets. EVEREADY BATTERIES ARE FRESH | BATTERIES Once more the DATE-LINE is a LIFE-LINE BECAUSE A "DRY CELL" AS YOU CALL | iT, ISN'T DRY. IN- ee SIDE IS A MOIST | MIXTURE . AND BECAUSE IN TIME, i THIS DRIES OUT. He Stumbled over a MAN-EATER in the Dark Soldier of Fortune lives to tell the story of a jungle | combat between man and beast. “If my light had failed at that mo- ment,ifitwerenotfor the fresh strong Eveready Batteries in my flashhght, they would probably havefoundsome of me on that path next morning. I might even have lived...but not with all my arms and legs. "Nearby was a boiler-room. I made for-it and with the aid of a slice-bar finally finished that ghastly survivor of the prehistoric beasts. “] think there are perhaps two morals to this story: “First, I owe life and limb to fresh Eveready Batteries, that gave me light when I had to have it. Second, if I had been using my flashlight on that trail, | would have entirely avoided the fright of my life. No one needs to tell me now that unexpected perils lurk in familiar paths.” NATIONAL CARBON COMPANY, INC. 30 East 42nd Street, New York, N. Y. «+. THE LONGER YOU KEEP THEM THE LESS YOU GET [| | OUT OF THEM. FRESHNESS || ISTHE ANSWER, AND | ONLY EVEREADY CAN |. GUARANTEE FRESHNESS, | THEY SELL 4,5 AND 6 || TIMES AS FAST AS ANY OTHERS. Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 17

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FOR INVENTORS And Mechanical 18 Answers to eu CGU lm 9 10 Questions on Page 131 By patenting the invention. Send skeich or model and de- scription with search fee to a registered palent attorney. 1101 U. S.—1279 Foreign. Abraham Lincoln. 17 years, Jt confers on patentee the ex- «lusive right to make, sell and use the invention covered by the patent. No. Pencil sketch and descrip- tion will usually suffice. A form on which an inventor may execute his sketch and de- scription. When properly filled out it is documentary evidence of your conception of the inven- lion. Because a layman or a lawyer in general practice is not learned in patent office practice. As soon as patent application covering the invention is filed in United States Patent Office and official receipt received. CLARENCE A. O’BRIEN and Hyman Berman 317-F Adams Building Washington, D. C. Registered Patent Attorneys Before U. S. Patent Office (Copyright Clarence A. O'Drien) TO OBTAIN A Small Ideas May Have Large Commercial Possibilities If you hope to realize profits from your invention, you must protect it with a United States Government Patent. Otherwise you may find that all your time and labor have been lost, because it often happens that other inventors are working on the same idea. If you have an idea, take steps to get a patent at once! E inn NY saab Waa D MT THE FREE BOOK shown here was pre- pared 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 information 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. Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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KNOW HOW to START KNOW EACH STEP to TAKE Before Going Too Far With Your Ideas Very often, the patent procedure is what we call a “simple” one—as illustrated here. Our FREE BOOK “Patent Guide for the Inventor” describes what to do and how to go about it. Send for it by all mcans—let us urge however, that you take the first step (STEP No. 1 to right) without further delay. It will prevent wasted work, mis-steps, and going ahead “in the dark”—vour whole patent procedure depends upon the first-step. Immediate Search Necessary A Search at the U. S. Patent Office will disclose one of three things: That you have hit upon an entirely original idea —that you have suggested patentable improvements upon an existing invention—or that your invention has been anticipated throughout, and'you should drop it. You should have this information at once. The next steps (the whole procedure of Seno For obtaining a patent) will be thoroughly explained to you in our FREE BOOK. Our FREE BOOK tells everything you need to know about patents. We will mail this book upon receipt of your letter requesting search--or if you want to read it before having search made, simply fill out the coupon below. Also Free Record of Invention Blank This FREE Record of Invention Form en- ables you to make in convenient form a sketch of your idea and have it witnessed in a manner of value to you should the occasion for evidence arise. MAIT, THIS COUPON TO- DAY and obtain our FREE tion Form. | i the Inventor,’ l | NAME nonn | ADDRESS l I STEP No. 1 Make a rough pene M cil sketch of your invention, describe it fully, and send it to us for prelimi- ‘nary séarch through a U. S. Patent Office. STEP No. 2 Our trained search- ers will then make 3 preliminary search of the pertinent U. S. Patents to deter- mine if your inven- tion is probably patentable, STEP No. 3 of search and opine ion-on patentability will be mailed to you with copies of U. S. Patents that we consider nearest to your invention. STEP No. 4 If you decide to make patent appli- cation, for customary fees explained in our booklet, our drafts- men will make draw- ings and proper pa- pers will be pre- pared for presenta- tion of your inven- tion to the Patent Examiner, Please send me your FREE BOOK, “Patent Guide for i and your “Record of Invention” Form, without any cost or obligation on my part. > “(important Write or print name plainly Our complete report - ma E p s 3 9 BOOK and Record of Inven- CLARENCE A.0 BRIEN -€&€ Hyman Berman WASHINGTON, D.C. REGISTERED PATENT ATTORNEYS = BEFORE U.S. PATENT OFFICE ) Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 19

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ona CI p ton OATS, boats, boats and more boats. The spring rains are certainly turning MM’s workshop fans into boat builders and it looks like this summer will find hundreds of our readers out on the lakes and rivers in their own craft. Our recent edition of How To Build 20 Boats is going fast. Now is the time to get your copy (it’s 50 cents) and get started on a practical boat for summer cruising, sail- ing or fishing. Or if you wish, you can get a copy of MM's free Blueprint Catalog, which: contains descriptions of a whole assortment of boats, from 7-foot Tar Baby to the 30-foot ocean cruiser T'ahiti, more than 40 boats in all. *xx We were down to see the eighth annual ex- hibition of the New York Society of Model Engineers recently and one of the first things we saw was a model of our Tiny Tom, the OO gauge pencil-length locomotive which ap- peared in our November, December and January issues as well as in our 1936 How-To-Build-It Book. We lost no time in getting in touch with its maker, William Pinter of Garwood, N. J. We asked him why he happened to build Tiny Tom and he answered with this letter and photograph to win our first prize of $5: Garwood, N. J. Dear Editor: Here is the story of how I happened to build your Tiny Tom. I read several model-making magazines, but I never thought of Modern Here is “Tiny Tom”, MM’s pencil length locomotive, in all his glory at the New York Model Engineers exhibit recently: “Tiny Tom” and his maker, William Pinter, steam off with first prize of $5 this month. Note detail of this perfect model. 20 Mechanix until, in November, 1935, a fellow model maker presented me with a copy of your publication. I liked the way you detailed your drawings of models, which, by the way, I do not find in other magazines. As these drawings make it very simple and easy for anyone with- out experience to construct any of your models, and as I was especially taken with the model of Tiny Tom, I decided to build this small loco- motive in my spare time. Y did not use any castings in the model, alf parts being made by me by hand, turned off a lathe. The drive wheels were built up of brass and, in fact, brass and sheet zinc was used throughout the whole model. Zine is very hice to work with in model work, it being easy to form and it makes a very neat soldering job. For power I used a miniature 6-volt motor which I purchased several years ago. I have been building models for some years in O gauge but this being much too large for an indoor layout, I decided to switch to OO gauge. I would appreciate it very much if you would publish more rolling stock and track layouts in your valuable magazine, preferably to scale. I am sure that not only myself but many of your readers would be glad to see this information in your periodical. William Pinter, It is letters like that that gladden the heart of any editor. As for the plans for rolling stock and track layouts that Mr. Pinter asks about, we knew those requests would come pouring in and so in our April issue we put in plans for everything, from flat car to caboose, Our second prize letter and photograph was sent in by Gene Caswell of Miami, Fla., who did some fast work on building the record breaking model plane which appeared in our March issue. You all know, of course, that each month we award three prizes for the best letters and photographs sent in to the Editor’s Workbench. First prize is $5, second prize is $3, and third prize is $2. Speaking of prizes, don’t overlook our big $1,000 cash contest which tests your knowledge of cars. Details appear on page 48. Gene’s letter follows: Miami, Fla. Dear Editor: I have enclosed a snapshot of the model Modern Mechanix & Inventions

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plane I built from the plans that ap- peared in the March issue of MM. The ship per- formed fine on its trial flights. I tried to obtain an action picture of the plane but it was too fast for me. I enjoy every page of your maga- zine including the ads, and, of course, especially anything about aviation and model building as I am a model fan. Gene Caswell. HEE Because of the good job George V. Piver of Beaufort, N. C., did in building Nomad, one of the boats whose plans are published in our recent edition of How To Build 20 Boats, we are awarding him the third prize this month. You can see why when you read his letter, which follows: standing still to win second prize. appearing in the March MM and finds her the real thing. ''Too fast for the camere" was this record breaking model plane, and so her builder, Gene Caswell, photographed her He built her from plans country. Just drop them a line and you will get the list free. Dr. Paul W. Bemis of Everett, Mass., states in a letter: “I have a very beautiful workshop with about $5,000 in- vested and work in metal and wood. I enjoy your publication and have been a reader from almost its inception." What is your shop worth? RH C. E. Dawe of Spokane, Wash., describes his shop as follows: “I have a wood working shop, lathe, jig saw, jointer, and circular saw, and use it as a hobby, as I like nothing better than to be sawing or working with wood. I buy MM each month from the newsstand and get lots of ideas and enjoyment out of it,” Beaufort, N. C. Dear Editor: I am sending you some snapshots of my She was de- signed for inland waters but has proven sea- I have used her for trolling for Nomad which I built last fall. worthy. blue fish at Beaufort Inlet and she is more seaworthy than some of the larger boats here. So far I have raced seven boats and beaten them all, and I haven’t much sail, as you can see by the photo, I have had 1,290 pounds in her and had plenty of room to spare. I am building a camp trailer now and will send a photo soon. I never miss a copy of your magazine. Let us have some more boat plans. George V. Piver. As long as we are on the sub- ject of boats, we might mention that the boating bureau of the Outboard Motors Corporation of Milwaukee, Wis., has com- piled a list of 188 outboard boat builders in all parts of the Magazine, May, 1936 LA Bert Tucker, 184 Coogee Bay Road, Coogee, Sydney, Australia, would like to exchange ideas and news with MM readers anywhere. a good opportunity for stamp collectors. Here’s Hue Richard Verreault of Buffalo tells us that "She is more seaworthy than some larger boats here," writes George Piver in describing his Nomad. His boat won 3rd prize of $2. in addition to Charles Wittholz the boat, pic- tured in How to Build 20 Boats in connection with Sam Rabl’s article on Sunray, was built by Paul J. Fries and himself under the supervision of George T. Verreault. The use of Mr. Verreault’s shop was one of the main factors in the successful completion of the boat. HHH "Ín the June, 1935, MM I built your shortwave two-tube receiver," writes Romeo Bar- talo of East Boston, Mass, “I logged ten South American [Continued on page 22] 21

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MORE PAY a etter JO B M Get out of overalls! If you are a shop worker, DRAFTING will put you in line for quick promotion and better pay. If you are a boss or office worker, Drafting means increased earning power and more efficiency. Write Today for Free Book! The Road to Advancement FTING In every walk of life practical training in DRAFTSMAN- SHIP will prove valuable. Even if you don’t accept a job as a DRAFTSMAN, you will be money ahead by taking Engineer Dobe’s Course, You will be amazed at the speed with which you can learn in your own home in your spare time by Engineer Dobe’s PRACTICAL METHOD, JOBS NOW OPEN In all industries, Drafting leads the way. In Aviation, Electricity, Building, Machinery, Automobile, Draftsmen must be used, and their work comes first. Recovery in industry and building is definitely on the way. Many trained Draftsmen will be needed on better jobs at better pay and shorter hours. Prepare NOW! Learn at Home From an Engineer I will teach you my practical method that has been success- ful with thousands since 1900, I will furnish you with all tools and a drawing table. I will teach you in a very short time by mail in your spare time until you actually have a desirable Draftsman’s job, or prepare you for better pay in the job you now have. No High School or previous experience Teeded. You must he entirely satisfled with my personal train- ing UNTIL COMPETIT and until assisted to a position, OR YOU GET ALL MONEY BACK. Start NOW Complete Outfit, and get the training. Prepare size 20x25 in., for more pay and a better furnished job. Send the coupon be- to you. low TODAY! Time is money! Don’t delay! No obligations! ea "hee TOOLS and SS EQUIPMENT Given When You Start, a - s " =) ej : ENGINEER DOBE, Div.47-35Libertyville, HL. — : @ Send me your free book, “Successful, Draftsmanship” and ex- s © plain how you will assist me to a good position as a draftsman, : a JVOiQss. Scat ru SL asus e e die. o k a pur Saree at a oa gn : a -a $ Post Office. 7 "ITITIIPEITTS B Chips from the Editor’s Workbench [Continued from page 21] William Gudrian built MM’s “Wanderer” trailer, but failed to give his address. Photos show exterior and interior. He says: “Trailer is very substantial, easy to handle and well-balanced.” stations, DJC in Berlin, and 12RO in Italy, in addition to amateur phone and American short wave stations," +X% Douglas D. Chent writes from Wanganin, New Zealand: I am very shortly commencing to build a Buddy for I think she is the cutest thing I have ever seen. I could sell my How to Butld 20 Boats (first edition) for an English pound, but I guess I'll stick to it and charge a pound for a loan. We'll wager that the new edition of How to Build 20 Boats will also join the ranks of rare editions soon. KEE Peter Tomasky of 931 W. 35th Place, Chicago, built MM's radiophone diving hel- met (in the 1936 How to Build It) and is ready to explore Lake Michigan's bottom. He wants to hear from other MM diving fans. From across the seas Ed Boxer and E. Knight of London, England, drop us this note: We are regular readers of your splendid magazine. We find the radio section of exceptional interest. Ne haven't got a periodical in this country any- thing like yours. They ask for plans for a tele- vision receiver, but, as yet, there are not enough television broadcasting stations to make such an article worth while. 22 Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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TO LEARN TO DANCE if you can do this single step! ‘by ARTHUR MURRAY World-Famous Dance Authority HERE’S always a good time and a lot of fun and social popularity to be enjoyed by good And there’s no reason why you shouldn’t dancers. be a good dancer, especially when you can now learn so quickly, easily, inexpensively. For I have perfected an amazing, sure-fire method of teaching you by mail! Now you can learn to dance in two hours, right in your home, with or without music or a partner ! Learn in Spare Time at Home Starting right from scratch with my Special 6-Lesson Dance Course, you soon master the popular steps of the Waltz and Fox Trot; acquire the correct dancing position, learn how to lead, the secrets of smooth following, pointers on ballroom etiquette, and many other things that good dancers must know. You study your course in the privacy of your own home where there’s no one to disturb you. There’s no expensive private teacher to pay. You practice the steps at your leisure, during spare time or at regular intervals, just as you please. Quickly you become a good dancer, dancing with assurance, having loads of fun with your friends. City Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers Meme hehehe tsi] emma ntn State ———— — —— ————— a A Thousands Have Learned This Easy Way -My simple method has enabled thou- sands of beginners, who never had a lesson in their lives, to dance well quickly. And I’m sure you can learn just as easily, so sure, in fact, that I offer you my Special 6-Lesson In- troductory Dance Course for only $1.00, on a money-back basis! Try Course 5 Days Here’s all I ask you to do: Clip and mail coupon today with $1.00. I'll send you the course at once. Then study the Course for 5 days, prac- tice the steps during spare moments. See how easily and quickly you can become a good dancer the Arthur Murray way. Send coupon now! When you have had the course for 5 days, if you are not delighted with the results, return it and Pll promptly refund your money! Arthur Murray, Studio 182 7 East 43rd St., New York City. ARTHUR MURRAY, Studio 182 7 Fast 43d Street, New York Clty, N. Y. | | To prove that I can learn to dance at home you may send me your | Special 6-Lesson Course for only $1.00 enclosed. I understand that if not delighted I may return the course within 5 days and my money | will be refunded. I | Name .oeeseeeceeh eram eth CE See ee Sees | dbi ER hte aa mre e naa l l áddress Loo. e cece teeter eee n tet e ener ren tenereteene m TM |

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Just mail the coupon and we'll send you a set of these remarkable auto $i 3$ FREE books, just off the press, Whether hipped you are pert or app a mechanic or helper, ex- tice. auto owner or FOR EXAMINATION driver, if you're interested in knowlng all about automoblle meechanies, then take ad- vantage of this FREE OFFER. —in the gigantic A Better Job auto industry— BIGGER PAY--a chance to go into business for yourself and get a share of the huge profils are waiting for any man who tries to im- provo himself, Learn auto engineering with these wonder. hooks a new way—mwithout Sludying or memorlzing. Simply use the JIFFY INDEX to look up the answer to any auto problem. Send NOW and we will FREE include the famous book 1 Automobile Service Shop Management" ete, DeLuxe edition, gold- without one penny of extra cost. An stamped flexible binding. amazing value and a money maker. ———— ee ee ee ee ee ee ee 1 AMERICAN TECHNICAL SOCIETY Drexel Ave. & 58th St., Dept. A-5320, Chicago, NI, I would like to see the new 6-volume edition of your AUTO BOOKS. € wl pay the few cents delivery charges only, but if I choose to, I may return them express collect. If after 10 days use I prefer to keep them I will send you $2 and pay the balance at the rate of $3 a month, until £24.80 is paid. Please include free book ‘‘Automobile Service Shop Management” as per your offer above. Send very latest editlon. $ Big Volumes NEW Edition 2500 pages, 2000 -illus- trations, wiring dia- grams, ete., including Ma- rine Engines, Aviation Motors, Diesel Engines, Name City L-2onc--l22cancucéese-epmdnaweesnue Stale losses neo a State Attach letter stating age, occupation and name and address of employer and at least one business man as reference, Diesel Engines and Aviation! Prepare now for the wonderful opportunities. 8 weeks’ training Gts you for a job that’s wuiting for you or to open your own repair shop. Livingston, Texas Dear Mac: I have been work- Clendenin, W. Va. Dear Mac: Send me a cata- log, I just want to look over the old school. I am getting along fine, doing a good busi- ness, all thanks to you and yourtraining. Will you send me another Diploma, as mine was destroyed. I was in the'class of '21. I send my best regards to the instruc- in$ mighty hard since I graduated from your school, with the Ford Motor Co. and am fetting along fine. Of course I could not expect top wages at the start, but I have already had one salary in- crease. So I guess my work is entirely satisfactory, thanks to your school. tors and to you also. erman Wilson. Leo Foreman. Write today for Big Free Book, Get the F R E facts about jobs; and Low Tuition Offers. Sending for this Book doesn’t obligate you. It obligates ME to tell Money in eight short weeks. QU Rad. e Seb apes r ne McSWEENY SCHOOLS AUTOMOBILE — DIESEL AVIATION GROUND MECHANICS CLEVELAND, OHIO or KANSAS CITY, MO. MEN @®anted to Qualify for Positions in New Industries AIR CONDITIONING ELECTRIC REFRIGERATION We want to personally interview, at our own ex- pense, a number of ambitious men—aged 21 to 40—in various localities. We will select as many as. possible to qualify for positions. in America’s twa fastest-growing industries, The men we select will be trained for installing and servicing ell kinds of domestic and commercial Air Conditioning and Electric Refrigeration equipment. Do not reply unless you are mechanically inclined, have falr education and are em- ployed at present at least part time. Character refer- ences required. You must be willing to study during spare time for few months at some cost to you. Write Shine full details of age, education and present occu- pation. ë UTILITIES ENGINEERING INSTITUTE 527; 400-410 N. Wells St., ^ Dept.256, Chicago, M. ,DEAL DIRECT. Factory Prices. Many models to ge. lect from: AC-DC, All wave, Farm, Car and new Metal Tube Modela, Your name and address on postcard brings you NEW 16- 1936 Bargain Catalog colors FREE. Get details of 30-day TRIAL plan and Agent-User propoaltion, GOLDENTONE RADIO CO,Dept. 260. 8780 Grand River Detroit, Mi SPECIAL Only complete electrical uuu à So simplified anyone can grasp quickly. Prepares you foreecure future. Low Costi RADIO AND ELECTRONIC ENGINEERING Ultra-modern course in radlo, publie OS tob Feni 1 t Vnddrone, photo electric work. rains you to be guper-gervice man, real vacuum tabe technician. Student pin, di kiven, Luilion ONLY $25. either course. Ask about deferred payment plan, ^ FRE E ! Send neme quick for free copies of school catalogs, student = magazines, complete details. SEND NOW! LINCOLN ENGINEERING SCHOOL, 895-10 So. 37th St., Lincoln, Nebr. hu iU d i Prepare quickly in spare time. Easy method, No previous experience necessary, common school education sufficie Many earn while learning. Send for free booklet ‘‘Opportun. Modern Photography’’, particulars and requirements. a ot AMERICAN SCHOOL OF PHOTOGRAPHY | E 3601 Michigan Avenue Dept. 2055, Chicago, Illinois ELECTRICAL ENGINEERING Govore i Splendid opportunities, 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 offered them. All forl0cents, OUTDOOR ENTERPRISE CO., 113 Main St., Holmes Park, Mo, ft. Flying Scale Models $ 14 size of real planes EACH plus 35c tor ! Packing, Post- age, insurance, If express cok lect send only $1.00 5 It. Monocoupe (Illustrated) 5 ft. Stinson R. 5 tt. 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Raise Giant Frogs We Buy What You Raise Good Profits—No Competition Each pair of Nufond Giant" breeders lay 10,000 eggs every year. With modern methods, up to 906% turn into frogs. - We pay you up to $5.00 per dozen for *Nufond Giants". Think of the profit possibilities! Competition is unknown because the wild supply is practically exhausted. “Nufond Giants” weigh up to 3 pounds. Start In Your Backyard Ex i À small backyard pond 20x25 feet with : "s ; a little ae space is all you need to 10,000 Eggs from Each Pair start. he pond EE is very shallow; BEEN - Any Climate Suitable “Nufond Giants” are a hardy breed of “North American” bull-frogs. You can raise them in the North or South, even in Canada. Costs Little to Start A frog pond is easy to make, There is noth- ing to buy except fence! You even raise the food right in the pond wilh f the frogs! What other A model backyard frog pond livestock offers you such advantages? WORLD’S LARGEST FROG MARKET little water is needed. Expand with the off- spring. Any kind of drinking water is suitable. Running water is not required. Flowers, lilies and plants make the pond very attractive. As originators of canned frog legs, we have developed the largest market for frogs in the world. Our products are on sale in principal cities throughout the country. WR i T. for our big, illustrated froz book. It explains our money- making proposition in detail. AMERICAN FROG CANNING COMPANY Dept. 119- E New Orleans, Louisiana Thank Vou for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 25

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arem SCHOOLS ennovnce AHIGHLY DEVELOPED DUAL COURSE DE EA i a Men of Ail Ages Can Qualify for Good Pay Jobs Established in 1905, National Schools’ course of Diesel "Training 1s the oul- growth of years of successful develop- ment — The instruetlon is PROVEN. National offers the most comprehenalve liaining—actually two complete courses fo. the price of one—Gas and Diesel Ensincering. Both courses are abso- litely essential to qualify for best jobs. Adlusting Starter on Caterplllar Diesel. Easy, Fascinating ““Shop-Practice’’ The day you begin your Training at Kational you start right In with a practical job on the most modern Gas and Diesel equipment, including Cater- pillar, Cummins, MeCormick-Deering, Hercules, Venn-Severn, Fairbanks- Morse, Enterprise, and many others. "Tie work is actually a pleasure for understand—ever- siidents—easy to i dascinating. Testing Mianus Marine Diesel, Training Includes All Phases Diesel Engines, Fuel Injection, Gas ines, Butane Engines, Propane, al Gas, Auto-Diesel leclries, line Shop, Batteries. LEARN IN LOS ANGELES Playground of America For a limiled time, coach N. It. fave allowed to L. A, from any part of the : U. N. Checking Pump on 30,000 MeCormrek- Deering Graduates EARN ROOM & BOARD WHILE LEARNING We help students obtain part-time jobs ta tam room and board while learning. Send Coupon for FREE BOOK OF FACTS eee i aa ee ee NATIONAL SCHOOLS Dept. MMA-5, 4000 So. Figueroa, Los Angeles, Calif. NAME Tyee CHEAP OIL BURNER COOK and Se Sada or WOO. Slips into Any Old Stove, Range or Furnace. No Ashes, Dirt — Twice the Heat, HALF THE COST, M ot. = COOKS A MEAL for 1¢ Al Beats any oll burner ever gotten out for US any" eK etove? tango t dardacet Quick Heat at puit. A TURN OF VA LVE AGENTS tense heat instantly by Salesmen Simple Tura of Valve, Try At Our Risk BIG MONEY Its sweeping the 30 DAYS’ TRIAL country. Clark Trove it mE drudgery and f dirt of coal or wood; cuts d., Rol: fuel bills in half, paya for days. ny Ss it Mass., sold 164 in ilself quickly by what IT SAVES, . WR. Get ZOUR D i FREE SAMPLE REE and mako FOR AGENTS |EE Money. offered io one? energetic WE á quick. man or woman in each locality who will demonstrate and take pesi Write quick, be first te learn how to make REAL MONEY time — mail 1c postcard today. ehh norte spar er fall UNITED FACTORIES, E-600 Exchange Bldg., Kansas City, Mo.: Write for free booklet describing "107 Plans for J Operating a Successful Business of Your Own". J Make from $20 to $100 a week starting in spare | time at home. No peddling or house-to-house selling. Booklet sent free, and without obligation. Write for your. copy today. ELITE PUBLISHING CO. i 214 Grand St. New York, N. Y. MODELMAKERS Engineers, Experimenters usual cost. Dept. G Get our 2 New Tllustrated Catalogs of the things you need. Make your own Ma- chinery, Model Steam, Gas, Boat and Airplane Bun at a fraction of th We furnish Castings, Pluen isis, and full instructions, Engine and Machinery Catalog No. 36— Lists Castings and Blueprints, complete engines, 20c wood and metal working machinery, etc. Modeimakers’ Materlals Catalog No. 37—20¢ Aluminum, brass, fibre & steel Sheets, Rods, Tubing, Gears, Pulleys, Screws, Nuts, Bolts, etc. Both 40c (coin or stamps). Outside U. . 30c each. Refunded on first orders EVRAY MECHANICSSUPPLY CO. MM-28N. Clinton, Chicago ART LESSONS ġe Become Talented Artist with Big Income This thorough course by Alexander Murray, A famous Art School instructor, makes it easy to learn art in spare time. Teaches commercial art, cartooning, lettering, anatomy, perspece tive, adv. layout, cte., without bother or exe pense of corresponding You get all 60 lessons at once—no waiting for next lesson. Over B15 instruction illustrations. 125 bases of drawing paper FREE. Send only $1.95 for Complete fame postpaid—or pay postman plus postage. MONEY BACK 1f not de. irhted after Inspecting. Stark now turning your spare time NE VOUCATIGNAL SUPPLY CO., Dept. A112-E o So-Los COSTS MUCH LESS RESULTS GUARANTEED FILLS HOLES, CRACKS— MENDS FURNITURE-NEEDS NO MIXING CAN-O-WOOD works like putty; hardens into real wood that can be sawed, planed, natled, painted, stained, or varnished. Won't crumble or chip. Fine texture— natural wood color. Requires no solvents, Will not harden in can. Lower priced 2X oz. Tube , . . . . 10c 1/3!bCan ... 2/]31b. Can .. 11b. Can ... a.. 50C CAN-O WOOD Is guaranteed to satisfy or moncy back—Tear out this ad and take to any Hardware or Paint Store S0-LO WORKS, Dept. MIYI5, € NATI, OHIO 26 Thank You for Mentioning Modern Mechanix and Luvcut.c.. Magazine When Writing to Advertisers

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I E UJ nescis $825 :{COMPLETE AS SHOWN LESS MOTOR HEE is the NEW Atlas back geared screw cutting lathe—NEW, modern GET AL teen E FA TURES design and strength. The result of 25 years building precision machinery. Self-contained countershaft and univer: Built especially for the manufacturing plant, machine shop, garage, service t ine range dl Standerd motor station and work shop. The accurately ground bed is 36” long. Has 1014” PO, 28 £0 orem EAE nean du aiis à n x. . enclosed on-off switch. Automatic reversi- E 18 between centers. The many important features of Atlas Die power feeds.. Threading dial, Gradua i i i stock ram, odern e. rive, ma e it T ay's biggest lathe value. (See partial list of features supplied heavy cast iron gear guard wit seri lack atch. New eas: Oo use readin: at no extra cost.) illustrated for resi set ups. {Heavier new Other NEW Atlas metal lathes priced from $35.50 and up. Additional — pest p serraRe and long eo eee dp " ” 1 r possible r. Hi n di com- bed lengths may be had up to 54" at slight extra cost, Sold on small e Meow ndtinteonte acorns On monthly payments extending over 3 years. 2 weeks trial. Money back ced screws—to remove excessive play. n B * E s Heavy tallstock clan Well and pin for if not satisfied. Now is the time to buy before prices go up. Send coupon center lubricant. "SclentiRe weight distribu- TODAY for FREE Catalog of metal and wood lathes, drill un MDC presses, tools and attachments. ed ATLAS PRESS COMPANY 552 No. Pitcher St., Kalamazoo, Mich. Please inail me your new cataiog. Atlas Press Co., 552 No. Pitcher St., Kalamazoo, Mich. | same ------------------------- —€— SAI LES OFFICES . 2 35 E. WACKER DR:, CHICAGO, E ew. Tint. x Kddiess. noscelesomocosedstcncu]demaes = CHIN. 3rd St- PHILADELPHIA "PR a : WANTED wanuracrunERs On small or large scale, by old established firm to cast 5 & 10c Novelties, Ashtrays, Toy Autos, ete. No special place or experience necessary as we furnish full instructions with moulds. A rare opportunity for these times so 1f you are over 21 and want to devote 3for your spare or full time to profitable work write AT 25c ONCE for full details as we are now closing arrange- “Sliver Only’ ments for 1986 supply of our goods, BOY BIG FUN. You apparently see thru Clothes, Waod, METAL CAST PRODUCTS CO. Stone, any object. See Bones ‘in Flesh. FREE PKG. radio picture films, takes pictures without camera. ‘You'll {tke ‘em. { pkg. 1696 Boston Road, Dept.2, New York, N. Y. wMh each 25c¢ order, MARVEL MFG. CO., Dent. 88, NEW HAVEN, CONN. tarn Money at Home B's TREE book in colors tells new easy way. You don't need experience, We show you how to decorate beauti- ful Art Novelties right in your own home by simple ''3-step'" method. o tedious study. Everything furnished, including supply of Novelties for you to decorate and Homecrafters OQutflt. Bis prof per piece for decorating, Just slt at home, and make up to $25 to $50 a week—full tlie or spare time. Just mail Le Now Gee, m Leaaorn JU get Arst les- gon absolutely freo, Start right in decorating Gifts, Bridge 1 Prizes, Toys, etc. More like fun than work MAIL THIS! and you earn as you learn. Hundreds making 3 SS eee eee C big money this qnan ver di i FIRESIDE INDUSTRIES ou risk nothing 5 A z NO CANVASSIN sending for Free Les- Dept. 142-E, Adrian, Mich. son. Nothing to pay now or ever. So sure are Please send big Free Book and you to succeed we give an absolute Warranty FREE LESSON. ‘This does nob backed by $1,000 Gold Bond. Costs nothing to obligate me in any way. - find out. Openings for new workers now in M Vaüeivaidie esie GIVEN YOU every locality. Mall coupon immediately for sul ` Free Book and Free Lesson. Get started TO DECORATE making money at once, etis soon Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 27

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ELECTR 2 RADIO REFRIGERATION” DIESEL ELECTRIC POWER feam Quicklyin spore name at Home 5 -by pichiy ir Shop Methods New YA to prepare for jobs leading to salaries of $30, $40, $50a week. Opportunities toearn $5—$10 a Weel and more while training. Learn ÉL Going fioe jobs in your own home electrical shop, Electric quip- ment and Apparatus supplied at no extra cost training practical, No previous experience or şducatlon necessnr: Money back if not pue TER rite for FREE BOOK of Facts and you as a trained Electrical Man.

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28 Thank You for Meutioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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To those who think Learning Music is hard- D ur you think that taking music lessons is — ee like taking a dose of medicine. It isn’t any longer ! m o7 As far as you're concerned, the old days of long practice hours with their hard-work exercises, and expensive personal teacher fees are over with. You have no alibis whatsoever for not making your start toward musical good times now! For, through a method that removes the boredom and extravagance, from music lessons, you can now Send for Our Free Book and eam to play yow favorite instrument entirely at Demonstration Lesson —w A ome—without a private teacher—at a fraction o If you really do want to the usual cost. piny your forore instrument, fl out and imail the coupon Easy As Can Be asking for our Free Booklet : and Free Demonstration Les- 'The lessons come to you by mail from the famous U. S. son. These explain our won- School of Music. They consist of complete printed instruc- derful method fully and show tions, diagrams, and all the music you need. You're never you how easily and quickly you : e ec ae + : can learn to play at little expense, U., N. School of Musie, 2025 in hot water. First you AE told how a e 5 done, Then Brunswick Bldg., New York City. Instruments supplied when needed, a picture shows you how, then cash or eredit, LEARN TO PLAY you do it yourself and hear it. ey ees ee eee ee ee BY NOTE No private teacher could make it Us» S. Sy OF MUSIG, Piano Violin clearer or easier. 2625 Brunswick Bldg., New York CIty. = m i : Send me your amazing free book, “Ilow You Can Master Musie in Guitac . Saxophone Forget that old-fashioned idea Your Own Home," with inspiring message by Dr. Frank Crane; alse Organ Ukulele that you need special “talent. Free Demonstration Lesson and particulars of your easy payment plan Tenor Banjo Just read the list of instruments (mention instrument). Hawaiian Guitar in the pauel aud decide which E Piano Accordion one you want to play. No matter Name .2.,.....,. 4. eee er ee er eee Or Any Other which instrument you choose, Address Instrument the cost in each case will llave you 3 average just a few cents a day. Por nc M this Inst.?......... * 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. If jobs in your line are steadi- ly growing scarcer, you owe it to yourself to investigate this new, progressive, uncrowded line, that will offer good open- ings for many years to come. astest-Growing Power Now is your chance to get into a big new industry and grow up wi it to an important position. Today there is practically no com tion in the Diesel field, but the increasing use of Diesel engines wii! result in keen competition for jobs in the near future. By startirg Diesel—The Newest, Diesel engines—because of their high efficiency, de- pendability, and economy of operation—are fast replac- ing steam and gasoline engines in power plants, motor trucks and LAN iti M busses, locomotives and ships, aircraft, tractors, dredges, Your training now, you can keep ahead of such competition. drills, pumps, etc.—opening up an increasing number of well- What This New Field Offers You paid jobs for Diesel-trained men. The field of Diesel Engineer- Get our Free Diesel Booklet and learn all about this newest Bing is on the upgrade and continually expanding. It will pro- fastest-growing line—its opportunities and requirements. Find out vide steady employment and advancement for those properly what the Diesel field offers you—how rapidly the Diesel industry trained in this new industry—as long as they need to work. has developed during the last three years—the large number cf ren get complete information on all the latest Diesel de- Diesel engines and accessories beingmidnufactied today: haw auch velopments—two- and four-stroke cycles; low- and high-speed You can obtain a compete understanding nese E CDS | and heavy-duty types: Diesel-electric generating systems, etc and operation Dy Home Tudy during your spare ime Sans | —in our course. Includes all text material—with special di 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. D-528, Drexel Avenue at 58th Street, Chicago, Ilinois Turn Your Spare Time into Dollars Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 29

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"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 papes—2,500 illustrations (A combined home-study course and reference library) AU LI) AND n AND THER. THEIR OPERATION . OPERATION = ES CANN ANEY DIES The 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 ONCE. 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 examinatlon coupon now. itu Days FREE TRIAL Just Mail rM Coupon! $*o9 9079 9 9» 9 9eo9ocw C9 9L 9S9 AC 3 ae, FREE EXAMINATION COUPON! s 6 McGRAW-HILL BOOK CO., Inc., 330 W. 42nd St., New York. g P Send me for 10 days’ free examination the AMERICAN $ p MACHINISTS’ LIBRARY. If I keen it I will send you $1.50 gat the end-of 10 days and $2.00 monthly until the Special Price g of $17.50 has been paid. If not wanted I will return the books , postpatd. , (Signed .............. f Position te seeennee sees $ Company augu ee Cte reer ee ee cee eee ey 2.RRRBRWWABEVABRAARABERBDABAREBRBRREBRAREER ER F REE: This Outdoors Sheath Knife Ideal for hunting, fishing and camping trips. It has a sturdy 4” blade, tempered and polished, with keen, durable culting. edge. Blade extends clear thru the bone stag handle. Complete with leather sheath. OUTDOORS is a monthly magazine you will enjoy. Filled with illustrated stories and information on hunting, fishing, camping and outdoor activities. Also up- {o-the-minute information on guns, fishing tackle, dogs. SPECIAL OFFER We will send you this Sheath Knife and OUTDOORS MAGAZINE for a whole year. Both for only $1.00 Clip this ad and mail today with $1.00 bill to OUTDOORS, Dept. M 333 N. Mich., Chicago, lil. 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Run Radio, Water System, Refrigerator,all Appliances SIZES 350 WATTS UP Easy to install. Available from stock. Ideal for Farms, Camps, Lake Homes, Commercial use. Sizes any purpose Write D W. ONAN & SONS 1661 Royalston Ave. Minneapolis, Mino. MAKE $50 TO $100 A WEEK: Many of our_ successful students are now making big money. Our simple methods make it fun to learn Commercial Art, Cartooning and Designing at home, in spare time, New low tuitlon_rate. Write for big free book, “ART for Pleasure and Profit," today. State age. STUDIO 205, WASHINGTON SCHOOL OF ART 1115—I5th ST., WASHINGTON, D. ©. New occupation. Pays big money at once without investment. Introduce sensational new line So and 10c necessities tostores. Self sellers, Permanent repeat business easy. Experience unnecessary, Start free, Write PRO-CO-PAX Dopt, 37-YO 1956 S. Troy CHICAGO 30 Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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THE MYSTERY PAINT OF 1000 USES Easy to apply—paint your electric light switches, house numbers, padlocks, door plates—anything you want to locate in the dark. Also used on fishing tackle for night fishing. A new, non-poisonous formula containing no radium, phosphorus, or calcium sulphide. Send $1.00 today for the Glo-Nite paint kit with complete instructions. Money-back guarantee. Or write for free demonstrating sample. Toledo, Ohio HIRSCH, Inc., BRILLIANT GREEN GLOW EN THE DARK YANDEE wa AL UUM Er Does away with slow hand work, Plugs in any light socket, A.C. or D. C. 110 v. 13,000 r.p. m. — For home, shop or take to job. Uses 200 dif- ferent accessories. .grinds - .Dolishes. . routs. „drills. a cuts. . carves. . sands. .sawS LALE L @1 ASW2 See . .Sharpens. .engraves. at your Order on our Ten-Day Dealer's Money-back Trial....or send for FREE Catalog. CRAFTSMAN Project Book **Pleasure and Profit with a Han- ‘102 — dee.’’Eusy working planaformak- And up Postpaid, Saccessor- ing many interesting and unusual ics FREE. Send order today, PteJects 25c, stamps or coin. Chicago Wheel & Mfg. Co.,106S. Aberdeen St., Chicago III Enroll in the oldest largest trade School in West. ELECTRICITY aui Est. 1905 30,000 Graduates LEARN IN LOS ANGELES Learn by practical actual shop-methods, Tull instruction in Electricity, Television, Radlo, Talking Pictures and Commercial and Broad- cast operating. National's all-inclusive course uallfies you for a successful, profitable future. Ye help students earn room and board while learning. Coach R. R. fare allowed to L. MAIL COUPON FOR FREE BOOK DurTimuaTeRünnré ^ NATIONAL SCHOOLS CITY STATE ...--...- The depression's over € THE question is, are you over the depression? Tough? You bet it was — it was the toughest depression this country ever had. But listen: The future is the brightest that ever beckoned a man. Opportunity calls from every side — calls to ambitious and trained men! If you have the am- bition, ihe International Correspon- dence Schools can supply the training. Get going! Snap out of it! Hurry this coupon along to Scranton. NTERNATIONAL CORRESPONDENCE SCHOOLS Box 2323-G, 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 X have marked X: TECHNICAL AND INDUSTRIAL COURSES O Architect à O Plumbing D Architectural Draftsman E] Air Conditioning O Building Estimating LI Steam Engineer E] Contractor and Builder D Steam Electric Engineer Q Structural Draftsman O Marine Engineer L] Structural Engineer Li Civil Engineer OU Electrical Engineer OO Highway Engineer D Electric Lighting L] Bridge Engineer O Welding, Electric and Gas O Bridge and Building Foreman O Reading Shop Blueprints O Surveying and Mapping O Telegraph Engineer’ D Refrigeration O Telephone Work O Radio O R. R. Locomotives O Air Brakes O Mechanical Engineer OR. R. Section Foreman: O Mechanical Draftsman OR. R. Signalmen O Machinist O Toolmaker O Chemistry DL] Patternmaker [1| Boilermaker O Coal Mining O Sheet Metal Worker QO Navigation O Heat Treatment of Metals DO Cotton Manufacturing O Management of Inventions O Woolen Manufacturing O Diesel Engiues D Agriculture O Aviation Engines O Fruit Growing O Automobile Mechanic OB Poultry Farming BUSINESS TRAINING COURSES E] Business Management O Business Correspondence E] Office Management O Lettering Show Cards D Signs O Industrial Management O Stenography and Typing O Trafic Management O Civil Service O Mail Carrier LJ Accountancy and C.P.A. O Railway Mail Clerk Coaching O Bookkeeping O Grade School Subjects O Secretariul Work O High School Subjects LI Cost Accountant O College Preparatory O Sulesmanship O Advertising O First Year College D Heating OD Pharmacy OC Service Station Salesmanship O Illustrating O Spanish L1 Wallpaper Decorating D Cartooning O French Salesmanship D Lumber Dealer BGI Gees sansa spatesteees anite eed eai eR IERI ASA ERna saepe es ERR ERREUR ED — WUErOsS cita SE . ORY ————————Ó Sli Biusece insana reis Present Position... df you reside in Corrcepondence Schools Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 31

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SHOUTS HEARD 15 MILES IN ARCTIC ET Sprank Offers REM UU Best Oddity 70 BELOW ZEROIN THE STRATOSPHERE 1$ TOO HOT FOR AIRPLANE MOTORS! — One ofthe big pem Comma The siratosphere plane isthat of keeping the molus Cool, EVER [Rough Ze fanperarure is 70 below, As the. density of the air decreases its cool Ig powers decrezse MSjeurdson, Cofetardor Al The underside Of VOCS, CUI and and tree (HDS are Coded WITH SHOW. H. dairis Springville, Cal. 4 F à i M pesce S [ORMA CONVERSATION CAN BE [isse nh - Á i à i HEARD I5 MILES IN THE ARCTIC ! — ORE THAN99 PERCENT OF THE POWER The coq dey a(rof Certi aras PRODUCED BY RADIO STATIONS IS NEVER : (0 withit the Arctic Circleconducds USED! Because somuch of the power j SOUNA JOreat// Yat COTVEFTZIIORS used in sending a prosre ia is lost rogh i s Cait b@ carted on Ht Normal voice absorption Ta fau] buildings, relephone i betweere parties 10 07/2 miles Wines aud nire feces, Quy 002 of anu Foolstens Crunching (Brouez PT cent erer terckes The radio audience, i : the SHOW C&it DO Ledd 2 Tile LUIS MARTINEZ, GUANTANAMO, CUBA. " auay.-7 hos iria, Detroit Mich, 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 ou this PARS. Send your Oddity to Nic Sprank. Modern Mechanix Publishing Co., Fawcett Bldg., Greenwich, Conn. 34

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the FUTURE in His Motion Picture “THINGS to COME" UBTERRANEAN cities flourishing under the scientific miracle of weather manu- factured by machines— Light-ray traps which recapture the very incidents of long vanished centuries so that you may. watch Columbus discover America if you wish— i Flowers and vegetables grown without soil or sunlight— Personal radio telephones carried on the clothing in a space no larger than a coat -H. G. Wells, novelist, histori- . an, and world famous prophetic . genius has found in the science _ button— BE . n B REA i An electric Space Gun powerful enough ; of today the roots of a startling to rocket human beings around the Moon— _ civilization. His discoveries ate ' Boring machines which carry joy-riding ` brought to life in a remarkable passengers to Aladdin's caves ten miles be- f i manner, as told in this article — neath the earth— These are some of the amazing achieve- -| a ments predicted for the world of tomorrow ET B by H. G. Wells, world-famous British novel- ou by ist who is hailed as the greatest prophetic DONALD G. ; COOLEY I Dr. R. H. Goddard, America’s foremost authority on rockets, whose work lays the foundation for H. G. Wells’ future space ship. Right—-This rocket tower, built by Dr. God- dard near Roswell, New Mexico, is the forerunner of the giant space gun envisaged by H. G, Wells fot launchiifg space ships to the moon. Dr. God- dard. as early as 1918. established mathematical proof that a rocket flight to the moon is possible. Circle — The towering space gun of ‘Things To Come.” The space ship is loweted by crane into the gun and fired according to mathemat- ical formula to the moon.

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Airplanes which rise and descend vertically are seen in "Things To Come." Here again Wells limits himself to improving things already proven practical, combining helicopters, auto-gyros and dirigibles in a single unit. genius of our day. With other miracles of the year 2054, they will soon be seen in Mr. Wells’ startling motion picture, prophetically entitled “Things to Come.” Not the least convincing fact about Mr. Wells’ vision of the future is the clean-cut way in which he eliminates what he calls scientific “balderdash.” Tomorrow’s world will be a triumph of science and the machine, to be sure. But there will be no robot men; machines will not rise like Frankensteins to slay their creators. Such fantastic touches as these often adorn the prophecies of less able scientists than H. G. Wells. But in “Things to Come” we have painted for us an astonishing picture in which there is not a single development which does not follow naturally out of labora- tory discoveries of our own day. It is in- spiring for us folk of 1936 to realize that the progress of science, as presented each month in the pages of MODERN MECHANIX & INVEN- TIONS, is laying the foundation for a new civilization. “Things to Come” begins in 1940, only four years away. Without warning, bombing planes appear suddenly over the city of Everytown, symbolic of every other city in the world. It is Christmas Eve. Out of the black night comes the soul-shattering terror of the bombs, rending skyscrapers to kin- dling, blowing people to atoms. Deadly new gases sweep through the ruined city, choking out the lives of men and women and children, proving that there will be no non-combatants in the next war. Frightful as the dramatized bombing ap- pears, it is no exaggeration. Since the last aerial bombing on a large scale in 1918, an amazing increase in efficiency has been demonstrated by the fighting planes of the world. The destruction wrought by Zeppe- lins and bombers during the World War was trivial when contrasted with the tremendous destructive power of modern air forces. Despite almost complete destruction, Everytown hurls every fiber of its strength against the enemy. Soon there comes a new horror—the shells of the enemy spread the germs of a strange disease, the Wandering Sickness. People stricken by it wander blindly for hours until they die. Water and "Mastery of Machines Is Key to Man's Survival Left—-This underground apartment in the future. city of Everytown was made of chemicals poured into moulds just as prefabricated houses are being built today as shown in circle.

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In this telescope at Everytown scientists watch the space ship fly to the moon. The new Mt. Wilson 200-inch tele- scope at right would be able to follow such flights with ease. Today's Progress Paves Way to Future Wonders. food supplies are contaminated. Doctors can devise no eure for it, for all laboratories, all means of research have been destroyed. This weird disease could be similar in form to the invisible plant disease virus which Dr. W. M. Stanley of the Rockefeller Institute for Medical Research succeeded in crystallizing recently. A few crystals of this substance dissolved in the city water supply would leave scarcely a resident alive. By 1970 the endless warfare has reduced the world to a state of barbarism. Nations have ceased to exist. In their place are communities like Everytown, domi- nated by local war-lords fighting with their neighbors. The people of Everytown live under the thumb of The Boss. In this desolate scene of havoe a miracle occurs one day. A strange airplane with queer, swallow-like wings descends in Everytown. The pilot is John Cabal, an aviator who lived in Everytown before the war, The Boss eagerly demands to know if he can buy planes and gasoline to fight to a “vic- torious peace,” but Cabal shakes his head. His government helps no one to wage war. The Boss angrily orders him thrown into a cell, where, some hours later, Richard Gor- An interior view of the space ship, looking down upon the two passengers who are to journey to the moon. Note the manner in which they ate suspended to absorb the first shock. don finds him. Gordon is an old friend of Cabal’s, and with the latter's directions Gor- don gets gasoline from Cabal’s plane, patches an old ship and manages to escape to Basra. The throb of powerful motors heralds Gor- don’s return with a squadron of bombing planes. The Boss is terrified, but he has a hostage! He ties Cabal in the middle of the square where the invaders must see him. In spite of this, the bombs begin to fall. They thud to earth and burst with harmless “plops,” but nothing seems to happen. Then, slowly, the Boss and his soldiers and all the citizens of Everytown fall asleep. For the bombs of the airmen are not designed to kill. They re- lease the gas of Peace, a powerful anesthetic. Thus, in 1970, the soldiers of science begin to build the world anew. And what a world! We see it next in 2054. An age of enormous mechanical and industrial energy has fol- lowed world peace. Flying over the new

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Science Must Go On— Wells Everytown, one might be completely un- aware of its existence. There are no sky- scrapers; they have vanished with the deca- dent age of steel The new Everytown is dug into the hills! It is constructed not of metal and rivets, but by chemistry. Liquids bubbling in giant retorts and are poured into moulding machines. They emerge as great slabs, perfectly insulated, immensely strong, which are welded together into walls. Cities are built out of test tubes; the carpenter, bricklayer, and steelworker have long been relegated to the discard. Already manufacturers of prefabricated houses in our world are accomplishing feats comparable to this, and architects and build- ers are expecting even more radical changes within the next year or so. The ceiling of the room curves over us gently; it seems as limit- less as the canopy of the sky. Standing in this room in the heart of the sub- terranean city, we can see miles and miles of landscape in the world outside. We see clouds where the ceiling should be. Rippling lakes, flower gardens, waving trees move majestically In “Things To Come” history i lessons will be taught by tele- 1 vision as shown below. New York is shown as a city of tall buildings full of windows be- cause eir conditioning and arti- ficial lighting hed not been per- fected when the buildings were erected. Today, however, air conditioning and lighting has advanced almost to the point that has been predicted by Wells. ' Theme In Film While flowers and trees growing underground without soil or sun- light as shown on the set at left may seem fantastic, modern science is already doing even more fantastic things with plants. Above is shown a plant which has been subjected to a .new chemical which causes roots to sprout on the stems or leaves. across the walls, giving a three-dimensional ef-- fect of vast distance. Mr. Wells lets us in on a secret. It is a moving frieze which is projected on the walls. It makes the tiniest room seem as vast as all outdoors. Many motion picture theaters of today em- ploy this medium for making their audito- riums seem larger. In place of a ceiling they have what appears to be a blue sky filled with stars and drifting clouds of light. As yet, however, the infinite pos- sibilities of this type of mural decoration have been scarcely touched upon. Weird Flowers Adorn Everytown All furniture is made entirely of glass and metal. Flowers are growing in glass vases about the room. They are like no flowers ever seen before—strange, gorgeously beauti- ful new blossoms, the creations of botanists. [Continued on page 127] Modern Mechanix & Inventions

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Giants of Sea and Air Vie for Transatlantic Honors OON to make their bids for the Atlantic travel trade are the new German Zeppelin LZ-129, already completed at Friedrich- shafen, and the liner Queen Mary, nearing completion at Clydebank, England. Both crafts feature luxuries duplicated only in the finest hotels, making transatlantic travel a pleasure even for those traveling on business. Scheduled to make their fixst voyages some time during the lat- ter part of May they will bring the old and new world even closer together than they are at present. While not as luxurious as the Queen Mary, the LZ-129 incor- porates many distinct features I including à smoking salon, prominade deck and large roomy cabins as well as the im- portant factor, speed. The Queen Mary, with possibly one or two exceptions, will be the finest ocean going craft ever to cross the Atlantic. While not the largest, the new ship will, no doubt, cut the crossing time by several hours. In order that its passengers’ minds will be kept occupied the ship has been fitted with a theater, swim- ming pool, game rooms, libraries, lounges and beautifully appointed cabins so as to make the voyage a most enjoyable one. the new British vessel, Queen Mary. be realized by the fact that it is only 200 feet shorter than the giant ship. 800 FE i eor T The new German Zeppelin LZ-129 is shown above compared in size with The size of the new Zeppelin can best Flame In London Opens Museum NCREDIBLE, yet an actuality was the opening of the New York Museum of Science and Industry located in Radio City by a candle flame burning in London. In the laboratories of Faraday House Sir William Bragg, noted English scientist, struck a match and lit a small candle. A nearby photo- electric eye responded to the light and sent an impulse to the short wave transmitters of the British Broadcasting Company where the signal was relayed to America. In New York the signal caused an ancient stopper lamp to glow, actuate another photo cell and turn on a bank of mercury vapor lamps opening the exhibit. , wee RADIO SENDING STATION f ORIGINAL WESTINGHOUSE STOPPER LAMP MADE: IN 1893 Dr. Frank Jewett, president of the New York Museum of Science and Industry, describes to fellow scientists the workings of the stopper lamp, photo electríc cell and relay used in the unusual dedication ceremonies. Above, at right, is shown the artist's conception of the broadcast showing the various stages through which the impulse produced by the candle flame, passed. Magazine, May, 1936 39

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Above—Oswald B. Lord, standing, supervises the play of his new game, Politics. "Thousands of people are spending their evenings with this game, in an attempt to become President. MERICA likes to play. Whether they know it or not, millions of otherwise rational Americans are forever waiting to be caught in the craze for a new puzzle, a new diversion, a new game. The very word “game” sounds trivial, but it isn’t. Games have a powerful influence on the social life of the world, and—games are the delight and the despair of the men who invent them. America likes to play, and is willing to pay for its fun. Right now it is playing a new game called Monopoly. Already the fastest- seling non-card pastime in the country, Monopoly bids fair to break all-time popu- larity records. Like parcheesi, Monopoly is played by shaking dice and moving tokens around a spaced board. But there the similarity ends. The Monopoly player is furnished at the outset with a handful of script money. When his dice land him in an unoccupied “street” he may purchase holdings there, and may levy rent from any other player unfortunate enough to fall in his domain. If he is clever he may acquire hotels, utilities and railroads. The ultimate object, of course, is to maneuver assets so cunningly that all other players are left bankrupt, with the winner holding all. The spendthrift player who manages his 40 America has an in- satiable appetite for games, but it is subject to whims, Feeding this ap- petite is a game itself, and one never knows which way to jump. Out of the East came Mah Jongg to captivate the public for a season. It proved too technical, however, and was lost. finances poorly finds himself utterly ruined. Monopoly, though it has taken hold only during the past year, has more than three decades of history behind it. In 1904 a young woman of Virginia named Mrs. Elizabeth Magie Phillips devised a game which she called "Landlord." Her motive was not to make money, nor primarily to furnish amuse- ment. “I conceived the game of Landlord to in- terest people in the single-tax plan of the great economist, Henry George,” said Mrs. Phillips recently. The game continued to be played in a small Modern Mechanix & Inventions

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by W. A. SWANBERG Following close upon the heels of Mah Jongg as a parlor pastime came Backgammon. This game is not new, having been played in England for centuries. It is still popular. way, and in 1924 Mrs. Phillips patented a variation on it which she called "The Land- lord's Game." This version later fell into the hands of Charles B. Darrow, of Philadelphia. Darrow revised the game and patented it. In 1931 he sold a few sets to friends, and finally interested a large Philadelphia department store in the idea. Parker Brothers, of Salem, Massachusetts, Magazine, May, 1936 More than 30 years ago Mrs. E. M. Phillips, above, devised a game called Landlord to interest people in a single tax plan. 'lhis game grew into Monopoly, another sensation of the year. Left—Not even the army escapes America’s craving for games. In this game, called Battle, armies are moved over the board to strategic positions in an effort to wipe out the foe. Railroads, highways and airplanes add to the complications. foremost manufacturers of games in the country, at first rejected Monopoly because in their opinion it required too many parts and took too long to play—three hours or more. By spring, however, the game attained such popularity that the Salem firm bought it under the patents of both Mrs. Phillips and Mr. Darrow. While Monopoly was beginning its amazing rise, Oswald B. Lord, a young textile execu- tive in New York City, set his agile mind to devising a game with a new twist. “Games have always been something of a hobby with me,” he said. “But it struck me that most new games were not really new at all, but were merely variations on old favorites like parcheesi, chess and checkers.” Oddly enough, it was while taking a hot shower that Mr. Lord pounced on a subject that offered excellent possibilities for a game. Politics! What with a presidential campaign [Continued on page 134] 41

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Tiny Dual Propelled Plane Takes Flight Like Autogyro MPLOYING a new principle in flying that permits takeoffs over very short runs a tiny craft rose above a crowd of unlookers at Denver airport much to their amazement. The airplane, the invention of F. Landgraf, a western aeronautical engineer, employs dual propellers which change pitch as they revolve so as to lift the plane with each revolution instead of just carrying it forward. The revolutionary feature of the plane is the two rotors and their placement. Mounted directly behind the wing they change tbeir angle of attraction with each revolution, coming down more or less flat and coming up almost edgewise. This construction permits the blades to offer little resistance on the up stroke and a great amount on the down. The plane, which required eighteen months to construct, is expected to change present light plane design. Not only will the new ship offer many safety features but will assist in the opening of the light plane field. Locomotive Dons Streamlined Dress Pictured beside the familiar steam locomotive is one of the latest streamlined types soon to be placed in regular passenger service by the Pennsylvania Railroad for long distance runs. EEPING in step with the times the Penn- sylvania Railroad recently completed a streamlined locomotive said to be the finest yet to be perfected by aerodynamic science. Using a standard steam type locomotive, a special metal shell was constructed around it so as to bring wind resistance to a mini- mum. The new housing is said to reduce resistance more than one-third at speeds of a mile-a- minute or more. Intended for high speed distant runs the locomotive is the forerunner of a fleet of this type. The new design results in a fuel saving equivalent to 300 horsepower. 42 Capable of rising from the ground with only a short take-off the new Lewis-Landgraf plane, shown above, combines fea- tures of the conventional airplane with those of the autogyro. Electric Eye Tests Auto’s Lights O LONGER is a long driveway necessary for testing the beam and brilliancy of automobile headlights. Recently introduced to the automotive world, a headlight adjust- ment instrument permits the car owner to have his lights checked in a fraction of the usual time required. A photoelectric cell connected to a micro- milliameter is adjusted on the instrument until the meter indicates lights are in exact focus. Aiidstmient of automobile headlights is simplified through the use of this instrument which employs a photoelectric cell and a sensitive micro-milliameter to determine focus. Modern Mechanix & Inventions

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New. York's VERTICAL HIGHWAYS Total 1700 Miles THERE ARE 5000 BLDGS. IN GREATER NEW YORK MORE THAN 20 STORIES f TALL ~ 300 MORE THAN 30 STORIE. : TALL, THE NUMBER OF i 10,000 ARE MORE THAN 6 STORIES TALL - PEOPLE USING ELEVATORS In OF ARUS NUMBER 3000 ARE ON IN THESE 10.000 BLDGS, S DATE TOTAL MORE THAN SS 4.000.000 DAILY DENVER * COLO, 4 S = NC THESE 10,000 Ñ BLDGS, ARE \ SERVED BY APPRO XIMATELY 30,000 \ ELEVATORS, THE SHAFTS IF PLACED IN STRAIGHT LINE WOULD EXTEND FROM NEW YORK TO DENVER.COLO. A \ DISTANCE OF MORE THAN 1700 MILES ] THE TOTAL. EO HEIGHT OF THE ELEVATOR SHAFTS IN THE 102 STORY EMPIRE STATE . BUILDING WOULD REACH WITHIN 3MILES OF THE: HIGHEST POINT . REACHED BY THE NAT'L. GEOGRAPHIC- US. ARMY STRATOSPHERE BALOON CONDON TERRACE © THE LARGEST APART ~. MENT BLDG. IN THE. ‘WORLD HAS 150 ELEVATO TO SERVE — 9 : . T5000 ARE ELEVATOR OPERATORS IT.IS i6 STORIES TALL AND CONTAINS 1667 APARTMENTS Sa ae The importance of elevators in everyday life is clearly shown in the above drawing. The startling fact that New York City alone has more than 1,700 miles of vertical highways was vividl y impressed upon its residents during the elevator strike. Almost every building in the United States of five stories or more is dependent upon freight and passenger elevators of some form. Magazine, May, 1936 43

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He Made Sky THE STORY OF High above the broken floor of the Rio Grande River basin, an airplane gtowls monotonously over .. 32,000 square miles, each click of its Cyclopean camera bringing nearer to completion the largest photographic mapping project ever undertaken The aerial rapid action camera, modern flying mate of the well- Note how easily a finger can trip or wind known press camera, in the United States. the shutter, advance fresh film and aim it for more exposures. Thus the camera becomes an integral part of the photographer, who operates’ it with the same ease as he does his automobile. XACTING and tedious is the scientific job of gathering up 32,000 square miles and literally pasting them in your hat. Only one man is utterly capable and he is the fellow who supervises the shooting and. assembling of this vast mosaic. He is the 39-year-old president of the Fairchild Aviation Company—Sherman M. Fairchild. The planes are his, the cameras are his and the science of aerial mapping grew from the two decades of study he put into air Photography. It isn’t easy even now, this business of sweeping up miles and not losing a single detour. And it wasn’t easy back in 1918, when Fairchild tried to interest U. S. Army officials in his new and revolutionary type of aerial camera, for he met with polite indif- ference and downright skepticism. But today he is world famous as the man who made sky mapping a big business. His latest invention, a $26,000 ten-lens camera, will photograph in one operation a ground area twice the size of New York City. Fairchild’s interest in photography began while he was still in college. After the army had rejected his new type of aerial camera, he went to work in the engineering department 44 of the Eastman Kodak Company. Then, again in 1922, he tackled army officials once more, this time persuading them to purchase twenty of his new cameras for $1,800 apiece. Two years later found him organizing an aerial magazine and newspaper photograph- ing service, with two planes from Huff- Daland & Company and representing them exclusively in the field of photography planes. But no clients appeared. Just when he was ready to give up an order came from the Brazilian Government for two machines. Jubilant, he informed his sponsors, only to learn with dismay that his agericy contract had expired three days previously. This news was a bitter pill to swallow but young Fair- child got out of that predicament by cabling Brazil that his present planes were “unsatis- factory” and that newer and better ships had just been developed, Brazilian officials took him at his word and ordered two. At that time one of the greatest airplane designers, Igor Sikorsky, was at Roosevelt Field—loafing. Fairchild hired him on the spot. Sikorsky jumped at the chance—his first job in America since he came over from Russia as a refugee. And the contract with Brazil was fulfilled successfully. A Fairchild Modern Mechanix & Inventions

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Mapping a Big Business SHERMAN M. FAIRCHILD AND HIS AERIAL Z H RD A A specially built dolly cradles the nine-lens camera designed for the U. S. Coast and Geodetic Survey. Front and rear compartments safeguard accessories. cabin monoplane is now a common sight, and this company ranks among the leaders in American private plane production. The corporation has four subsidiaries, manu- factures 75 per cent of the world's aeríal cameras and owns the largest aerial picture library in existence—in fact, the entire world. Magazine, May, 1936 7 RICHARD H. PARKE CAMERA b Sherman M. Fairchild and his nine-lens single unit aerial camera. The diagram (upper left) is that of the negative, under which is the print. The watch, negative number, reference marks, level and data card are photographed simultaneously with the remarkable nine-view picture. Already referred to is Fairchild’s latest survey—the Rio Grande project. This is the third consecutive job his organization has undertaken for Uncle Sam. The first two were the aerial mapping of Boulder Dam and 25,000 square miles of watershed in the Indian Reservations of Arizona, New Mexico and Utah. . All these jobs, which take in more than 84,000 square miles of terriotory, are part of the government’s program for soil conserva- tion. From the completed maps, experts will be able to plan the control of this vital prob- lem and, in the case of Boulder Dam, will be able to determine in advance the number of auxiliary dams needed to control the silt now being washed into the reservoir from the various tributaries. Preparing an aerial map involves a tre- mendous amount of detailed work, work 45

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HOW The CAMERA Snaps TEN FILMS Simultaneously Aligning the cameras by hand, with the units set at a 45 degree angle to each other in order to get a photograph of the entire area. In fight, of course, the cameras function automatically, with pho- tographer keeping constant check. which can be entrusted only to men skilled “in the art of aerial photography. First, before any flying is started a sketch of the operations contemplated is drawn on a master chart, the area being split into small . Working assignments by dividing it into a number of parallel, rectangular strips. Each strip represents the central portion of pho- tographs to be taken during a single flight across specified ground. On this master chart is recorded the eleva- tion from which each strip has to be pho- tographed to obtain the desired scale, the altitude in each case being determined mathematically. The chart also shows the various landmarks, for these serve as guides to the pilot and photographer, When the master chart is completed, the plan of operations is reviewed with the air crew and then the job of “flying the map” is 46 TWO NEGATIVE SETS O OVERLAPPED PRINTS FOR FINISHED PICTURE Diagrams show setting of the combining parts of ten- lens camera (below) and method of assembling to make octagonal composite. Beneath is the world's largest photograph. It ows every square inch of Connecticut's 5,004 square miles. Homes, even hedges, stand out in micro- scopic clarity and are very easily idenitfied. Photograph measures | only 18 feet in length and is 13 feet high. begun. The pilot flies along the guide of flight lines back and forth, forming “strips” until the entire area is covered. Aerial photographic mapping operations are usually flown at altitudes as high as two to three miles, necessitating the use of oxygen by both pilot and photographer. In mapping large areas a 5-lens camera is commonly used, pointing downward through a hole in the bottom of the plane. The [Continued on page 136] Modern Mechanix & Inventions

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“WInD-(OUNNEL co C Joreshadows New Airship ROPELLED by driving air through a lengthwise tube, an unusual automobile was recently demonstrated at Kansas City air- port by its inventor, Thomas M. Finley. The device, which is con- structed on a V-8 Ford chassis, weighs 5,000 pounds and is capable of speeds of to 47 miles per hour. Intended by the inventor to demonstrate to government officials the value of dirigibles patterned after it, the air speed of the craft’s tube has reached 105 miles per hour accord- ing to reports. It is believed that by constructing the lighter than air craft in wind tunnel fashion not only will speed be increased, but the safety as well. The propeller located in one end of the wind tunnel creates a partial vacuum which constantly causes air to rush into the tube forcing the dirigible through the air. Vacuum Cleaner Is Shop Tool ESIGNED to keep foreign matter, such as abrasives, out of the automobile motor during valve grinding, a mechanic’s vac- uum cleaner has been recently in- troduced. Working in connection with any type of seat grinder this vacuum cleaner aids in auto. repair work. New Respirator Aids Miner’s Safety NTENDED for use in mines a new government tested respirator weighing only 514 ounces is the ‘latest of safety devices for per- sons working in the vicinity of lead and other heavy dusts of poisonous nature. While small in size this respirator All parts are re- is a proven safety factor for Persons working in dust filled air. placeable. Magazine, May, 1936 Constructed as a demonstration model for government officials this strange automobile pictured here with its inventor, Thomas Finley, is driven by & propellor revolving in a wind tunnel. Street Cars To Follow Bus Design OON to make their appearance on the streets of Baltimore are 27 street cars representing the result of years of traction research. The cars, similar to those now in service in Washington, D. C., will be free from noise. They represent the latest in riding comfort. In design the cars follow closely the architecture of modern busses with slanting windshield, electric wiper and defroster. The cars have a top speed of nearly fifty miles per hour. Streamlined and free from vibration this new noiseless street car is one of 27 to be placed in service shortly in Baltimore. Cats will be air conditioned and furnished with deluxe seats. 47

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Do YOU Know C ARS? VERY day you witness or participate in the parade of 1936 automobiles. You see new cars on every hand, but do you recognize the cars you meet? If you do, you have a good chance to win one of the 183 cash prizes in this big $1,000.00 contest. In this installment, the second of a series of three, there are printed the identifying fea- tures of four popular automobiles. All you have to do is write in the alloted space the name of the car from which the identifying feature was taken. Less than 30 years ago it was possible to recognize your neighbors team of horses a half mile away simply by their gait. Whether or not this ability to identify familiar objects has been passed on to the auto-driving gen- eration is the question that brought about this unique contest. After identifying the cars, the next step is to write a ten-word safety slogan, something straight to the point which may be instru- mental in saving hundreds of lives. This slogan can be on any phase of motor- ing safety which will awaken the driver or pedestrian to his or her responsibility. The first installment of the contest appeared in the April issue, and the third will appear next month. Study the rules carefully, and write your safety slogan while waiting for the last four photos next month. THE QUESTIONS ANSWER THESE QUESTIONS 1. What is your age and occupation? 2, Do you own an automobile?...................... What make? .................. What year? ............ 3. Do you plan to buy a new car?............... When? sedes What make? 4. Approximately how many miles do you travel in your car annually?........................ 5. What brand gasoline do you regularly büy euer we What, O12 ieena S What tires? aeren sonne The Name of This Car Is ek 44 44 23 69 4 344440 U eA LH babes qe ha ado habbo reus shoe E eh eh bo Pensa no rh papa pet A khen b etienne

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$1000.00 CONTEST! THE RULES 1 Cut out each photograph and in the space below it write the name of the car from which the identifying feature was taken. 2 DO NOT MAIL YOUR ENTRY UNTIL ALL ee PHOTOGRAPHS HAVE BEEN PUB- 3 Answer accompanying questions. Your replies to these questions will not be considered by the judges, but to be eligible each entrant MUST answer the questions. “4 In ten words or less state your "SAFETY SLOGAN.” The originality shown in the “SAFETY SLOGAN” WILL BE CONSIDERED by the judges. The "Safety Slogans” are to become the sole property of Modern Mechanix Publishing Co. 5 This contest is open to everyone except employes of Modern Mechanix Publishing Co. 6 You don’t have to buy a copy of this magazine or be a subscriber to enter this contest. Recognizable facsimiles of the photographs will be acceptable, 7 Contestants need not submit elaborate entries. Neat- ness, brevity, and accuracy will be the deciding factors. No entries will be returned. 8 The editors of this magazine will be the judges. Their decisions are final. In case of ties duplicate prizes will be awarded. 9 Mail your entry to the AUTOMOBILE CONTEST EDITOR, Modern Mechanix Publishing Company, Greenwich, Conn. Write your name and address clearly on your entry. To be eligible entries must be postmarked on or before June 1, 1936. Winners will be announced as soon as possible after the close of the contest. THE PRIZES First Prize oes .... $250.00 IN CASH Second Prize ..................... 150.00 IN CASH Third Prize ....................... 100.00 IN CASH 5 Fourth Prizes .. a. 25.00 EACH 10 Fifth Prizes ........... V 10.00 EACH 15 Sixth Prizes ................. 5.00 EACH 50 Seventh Prizes ............. 2.00 EACH - 100 Eighth Prizes .............. 1.00 EACH TOTAL—183 $1,000.00 PRIZES .....— ue IN CASH The Name of This Car Is

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Music Students Aided By Strange Mechanical Gadgets Professor Portnoff of the University of Miami Conservatory of Music demonstrates device for guiding bow across strings and arm rest to hold elbow at proper height while playing. Elevator Grades 1,700 Eggs In Hour EMONSTRATED. before thousands of New Yorkers who attended the Poultry Producers Council a recently patented: egg grader proved itself equal to a human being. Eggs placed in a sloping track at the top of the machine, roll down to an endless con- veyor. Adjusted weights pick eggs from the conveyor which are lighter than the weights. Four grades are selected. In one hour the machine can grade and pack 1,700 eggs. Without breaking a single egg this egg packer and grader is capable of handling up to 1,700 eggs per hour. After divid- ing them into four grades, eggs are packed in delivery crates. 50 ROFESSOR Leo Portnoff of the Univer- sity of Miami Conservatory of Music faculty is the inventor of unusual mechanical devices designed to aid students of stringed instruments to learn technique rapidly. Basing his inventions upon psychology Pro- fessor Portnoff claims that they help to establish calm and cool deliberation, poise and dignity, self possession grace and rhythm. Believing that the real art of music begins where technique leaves off he set about con- structing the necessary devices required to aid students in the proper study of music. After much experiment he has succeeded in developing instruments for teaching stroke technique and flexibility of the wrist. Barney Oldfield Gets Odd License The famous automobile race driver, Barney Oldfield, wears a broad smile because he has been issued, by the state in which he resides, license plates which bear his own initials. AMOUS as American’s number one auto- mobile race driver, Barney Oldfield has been assigned automobile license plates bear- ing his own initials. So pleased was the noted driver with the plates that he immediately attached them to the special car he will use in making a safety campaign tour of the United States. Oldfield is one of the pioneer automobile test drivers who still plays an important part in the automobile world. ' Modern Mechanix & Inventions

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di P^ | an za The airplane drawn into the cartoon above has its counterpart in ell the toy shops of the land. Thus, even the littlest. of Toonerville Trolley fans have no difficulty in ap- preciating the humorous inventions of Mr. Fox. Proving, as would Flem Proddy (cartoon charac- ter), that there ate many popular inventions whic never reach patent office. HE world lost a great inventor when Fontaine Fox became a cartoonist. It is true that not a single one of his in- ventions has ever run, except on paper, and the United States Patent Office would look askance at his contraptions if he tried to patent them, but they bring him fabulous royalties just the same. They also demon- strate that an inventive turn of mind is just as necessary to the successful cartoonist as to the scientific experimenter or basement workshop fan. . The Toonervile Trolley was invented in 1908 and has been running steadily with capacity laughter loads ever since. It made such an immediate hit that young Fox was Magazine, May, 1936 Meet Toonerville's Inventor — 29 NE FOX THER Loonies SADE 3 GHT 15 u gut YOUR EYES Cow HOW &o BAD YOU fe o ALWAYS ) MUCH TROUPE AT OTHER 3 TIN T HAO, PUT o gv BACK QN wine t The rickety, top-heavy old trolley gallumps its daily way across the in- sane tracks of the funnies, and you laugh. But Fontaine Fox (left) doesn’t. He is concen- trating upon more ideas for the coming weeks. It is his inventive mind as well as his drawing ability that keeps him up with best of daily cartoonists. Cartoons reproduced through courtesy of Bell Syndicate. forced to invent and populate the entire village of Toonerville. Flem Proddy is Toonerville’s local inventor and his gadgets are all the more amusing because they should be taken seriously as horrible examples of what not to invent. Fontaine Fox’s working habits are those of any successful inventor. He doesn’t sit around waiting for inspiration. When an idea doesn’t come rvadily, he sits down and patiently figures it out in cold sweat. The phenomenal popularity of Fontaine Fox over a period of years marks him as one of the greatest cartoonists of all time. Tooner- ville folks have been as generous with him as he has been with them. 5]

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DOCKING the Leaving her pier stern first, tugs push a ship back in a great arc, until finally she is headed downstream. WE WERE off to keep an appointment with a 79,290-ton visitor from across the seas—the giant French liner Normandie. Captain Anton Huseby, master of the tug, Alice M., and the man who was to assume the responsibility of docking the Normandie at her Hudson River pier, stood alongside me. Realizing that the captain would soon be too busy to answer my questions, I took the opportunity to ask, “Do you find it more diffi- cult to dock the Normandie than the other passenger ships that come into New York?” He smiled. “Believe it or not,” he replied, “but the Normandie, for all her size and power, is one of the easiest ships I’ve handled in the twenty years I’ve been in the business. Last time she came in we docked her in twenty minutes—fast time for any vessel. “But docking an ocean liner, or for that matter any ship, can never be done on schedule. It all depends on the tides, the con- dition of the weather, the amount of harbor traffic and the season of the year. No two jobs are the same. Given a nice summer day, 52 ormandie With At Quarantine, the tug-fleet’s captain transfer to the ship’s bridge—to supervise the docking. Swinging the Europa into her dock requites the work of ten tugs, three of them (above) are working against her bow. a flood tide and no wind, a ship can be docked in record time. On the other hand, it can be pretty tough if you run into a northwest gale in the middle of winter, an adverse tide - and a river packed hard with ice. Night work is difficult, too. Distances are deceiving then and sometimes we're bothered by the glare from the lights on the pier." "Then," I said, "there's really no set formula for docking a ship." "No. Conditions change daily and the only reason we seldom have an accident—is Modern Mechanix & Inventions

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New York's TUG FLEET by JAMES DYSON The Normandie, for all her great size and power, is one of the easiest of the big ships to handle, claims Anton Huseby, Norwegian captain of the Moran Fleet of New York Harbor tugboats, and the man responsible for docking this great liner. Last time he berthed her in 20 minutes —fast work on any vessel. - Carefully guarded from dense river traffic by her convoy of harbor ants, the sea queen steams up the Hudson to her pier. because we always anticipate trouble. We know from experience exactly what to ex- pect. “See this police whistle? Well, I use this to signal my directions to the tugs. They acknowledge each signal with blasts from their own whistles—that’s why you always hear a chorus of tugboat whistles when a ship is coming in. They all mean something. For instance, one blast means ahead; another single blast, stop; two blasts, reverse engines, and three or four quick blasts, push in and give her all you've got! We'll have eight tugs on today's job." Magazine, May, 1936 of “All Sehor L Comes the cry sd tugs get read: the ph the moo: “How do you determine the number of tugs?” I inquired. “There again it depends on the conditions,” he answered. “When the Normandie first came over we used twelve boats, but I’ve docked her with only six. We usually use ten tugs for the Majestic, Berengaria, Bremen and Europa and about eight for the Aquitania and other ships of her size. But I can remember one tough day in the middle of winter when we had fourteen tugs on the Bremen and it took three hours to dock her. All this was explained to me as we moved along towards the French Line pier. The Normandie had by this time cleared Quaran- [Continued on page 120] 53

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Automobile Exhaust Fumes Help Fight Stubborn Blazes Requiring bur a fraction of the space needed for similar devices this foam generator is operated by the exhaust of the fire engine. Auto Driven To Western-Most U. S. OCATED at the northwestern tip of the State of Washington is the most westerly part of continental United States that can be reached by automobile. From this point the distance to China is almost 6,000 miles, all the distance being across open sea. It is possible to reach this unique spot by motor car from Seattle in several hours driving time over modern paved highways. This bleak spot located in the northwestern corner of the state of Washington is the most westerly part of the United States, From this point it is 5,996 miles to the shore of China. 54 Firemen here demonstrate its effectiveness: SING the exhaust fumes from the motor of the fire apparatus a small foam genera- tor recently tested near London proved highly practical in putting out chemical and oil blazes. The generator is light enough to be transported by two men and requires very little space. To place in operation the gen- erator is filled with liquid chemicals and a length of metal tubing is connected between it and the exhaust pipe of the fire engine. The fluid passes through a glass chamber where it mixes with the gas and then is pumped, by a small electric motor, to the scene of the blaze. The inventors of the device claim that by using exhaust gas the cost over the usual methods is cut by 90 per cent. Ancient Yarn Spinner Runs Again Examining closely the work of this one hundred-year-old cotton spinner are Edsel Fotd and Nathan Adamo of the Texas Centennial. The spinner is from the Ford Industrial Museum. COTTON spinning machine that saw service on a southern plantation more than one hundred years ago will be one of the interesting exhibits to be seen at the coming Texas Centennial Exposition to be held at Dallas. The ancient machine is one of the many from the collection of Henry Ford that will describe to visitors the advancement made during the last century by the various in- dustries in the Lone Star State. Modern Mechanix & Inventions

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Mechanical Tornadoes Power Odd Barrel Plane WISP of cigarette smoke blown through a little cylin- der led Ralph K. Odor, of the Oklahoma A. and M. College, to design an unusual airplane that may revolutionize present aircraft design. The plane, according to its inventor, will be powered by two engines each one mounted before a barrel-like wing struc- ture so as to drive the wind through the tubes in the same manner as a tornado “twister.” In experiments made on models the wind tunnel tests showed a zero “drag” indicating that in full scale the plane should attain great speeds with little resistance. Mr. Odor’s first plane is to be constructed of steel reinforced fabric. It will have a wing spread of 35-feet, measure 24-feet in length and 8-feet in heighth. Provision will be made for carrying a pilot and four passengers with ease. Two specially designed 100-horsepower motors will supply the motive power. Diesels Speed Travel In Argentina Featuring luxurious appointments and capable of attaining high speeds this modern rail car is one of a fleet soon to be placed in service on the railroads of eastern Argentina. 'N ORDER that they might keep abreast with the rest of the world the Argentina Railways have contracted with a British loco- motive works to have built a fleet of high speed diesel cars. The new coaches will be very similar to those now in use in the United States and will feature reversible seats and other luxurious appointments. Due to the limited facilities in South America the cars will all have dual operating controls so that they may be used where no turn-tables exist. The manufacturer of the streamlined rail cars claims that not only will high speeds be possible, but that the trains may he operated at very low cost. In experimental runs tests showed that it was possible to run the cars nine miles on one gallon of oil. Magazine, May, 1936 Different in both operation and design is this strange barrel airplane. It inventor, Ralph faster than any other planes. dor, shown above, claims that it will fly higher and The ship required seven years to design. Rolling Tripod Aids Movie Making N TAKING difficult scenes moving picture directors at a Hollywood studio found that with their usual camera tripods it was im- possible to get effective camera angles with- out an unusual amount of experimental shots. Members of the studio’s technical staff were assigned the jeb of constructing a tripod that would meet the requirements of the pro- ducers although their task seemed impossible. After weeks of experimenting the techni- cians announced that they had completed a tripod which would meet the producers’ de- mands. The result was a rubber tired dolly on which was mounted a camera crane that could be adjusted in a few moments to any angle. The tripod can be elevated from one to seven feet and will swing completely around. A lever permits the camera to be set at any degree thus doing away with the former complicated methods. To permit cameras to move about at various angles during the filming of motion pictures this combination dolly and crane was invented by technicians of a leading California atudio. 55

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When Hollywood STARS To Nelson Eddy, singing star of Naughty Marietta and Rose Marie there is no mystery in sound reproduction, for he has made that science his hobby. His home laboratory is filled with sound apparatus with which he is always experimenting. HILE their images are engaged in en- tertaining millions of people in theaters all over the world, Hollywood stars can be found entertaining themselves—in their workshops. And while their images flash across the screen, garbed in sophisticated evening apparel, gay costumes of former periods, or flashy uniforms, the stars are hard at work in grease stained coveralls, dungarees and sweat shirts, or the first old garments to come to hand. Hobbies in Hollywood are not a fad. They represent years of study and hard work, and when an actor speaks of his particular in- terest, he speaks with authority. Contrary to popular belief, the lure of the night clubs and bright spots is dwarfed by the compelling in- terest the stars show in their hobbies. Wallace Beery is the most famous flier in Hollywood. When not before the cameras he is either up in his six-passenger Bellanca plane testing out new devices, or poring over maps and technical literature on Aying at his airport. After aviation comes fishing, and then amateur photography. 56 Above—One of the bestequipped and the most used work shops is owned by arren William, Warner- First National star. In addition he is an ama- ture inventor and crack sailor. Right—W ander- lure II, a 40-foot schooner, occupies the spare time of Henry Wilcoxon, star of The Crusades, since he made navigation his chief hobby. Nelson Eddy’s hobby is also part of his vocation. He studies voice recordings in his home laboratory, which is equipped with the latest sound apparatus. He uses his own voice and those of his friends to carry on a scientific study of sound reproduction, with the result that he is one of the few singing stars to take full advantage of the micro- phone. Also outstanding in this group of mechanically-minded screen stars is Modern Mechanix & Inventions

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TURN 76 HOBBIES Above — Clark Gable, hero of a score of ecreen classics, mixes pho- tography with his two other hobbies, fishing and hunting. He often joins Beery on an aerial jaunt to some favorite fishing grounds. Left—The un. disputed ace pilot of Holly- wood is Wallace Beery. Aviation in all ite technical phases is his particular hobby. Alan Hale, whose flair is for things scientific, Of his many inventions three are deserving of mention because of their value to the modern world: His new "Tellurian," his perfected “Aerobot,” and his im- proved eye-glasses. The “Tellurian” was conceived by Sir Isaac Newton a century ago, in the hope it would demonstrate the effect of various planets upon life and conditions on the earth, It was finally Magazine, May, 1936 By HOWARD SHARPE Most of Hollywood's actresses are experts in interior deco- rating, but Maureen O'Sullivan uses her modeling hobby to make her own objects of art. She is an expert in clay figures. built by Hale and Merrill Hard, partners in an experimental and research laboratory. The instrument so simplifies the study of astrological bodies that a twelve-year-old boy, after four half-hour lessons, is enabled to pass a "Teacher's Normal" examination which usually requires four years of study. Hale's perfected “Aerobot” is capable of controlling the plane’s speed, altitude and flight direction while the pilot devotes his time to charting or listening to the radio. Many of the Hollywood great have turned to boats for their hobbies, Warren William considers it no great accomplishment to handle his 30-foot sloop, Common Sense single handed in a strong wind. Henry Wilcoxon is another to prefer the graceful close-to-the- water sweep of a sail-boat, while “Tarzan” Weissmuller has a 48-foot yacht powered by two Diesel motors. Even Sir Guy Standing, whose real mechanical hobby is an automo- bile trailer, occasionally finds time to tinker with the engine of his small motor-boat. Sir Guy’s trailer is roomy with a door built into the side, and contains all the requisite [Continued on page 122] 57

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Equalling the professional astronomer's instrument is this unique telescope designed by Alan Gee a 19-year-old youth who expects to enter West Point through his advanced study. Movie Gliders Break Flying Records HILE appearing in a moving picture short filmed from the palisades adjoining the Pacific Ocean in Southern California “Speed” Westphal, national glider champion, unintentionally broke the west coast record for utility gliders. During one of the scenes the plane caught a perfect wind and glided fourteen miles before coming to earth. The craft which made the record-breaking flight was designed by a studio writer, Gus Briegleb. Youth Builds Telescope; Equals Professional Models ETERMINED to gain admittance to West Point Alan Gee, a 19-year-old Washing- ton, D. C, youth, is studying advance astronomy on an elaborate telescope designed by himself. The instrument, powered by an electric driven mechanism, may be used as a Newtonian reflector type or a Cassigrain, both having unusual range. Young Gee, not content with the usual tele- scopes used for amateur purposes, decided that his instrument would not follow the de- sign of the more common ones, "The result was a device superior to many commercial types used by college science departments. Shop Travels to Scene of Work In order to reduce construction costs this trailer machine shop can be transported to the actual scene of construc- tion. It contains all the machines found in the average shop. h ESIGNED in the form of an automobile trailer a German manufacturer has placed on the market a portable machine shop which may be towed to the scene of construc- tion by a motor truck. The trailer contains metal turning lathes, grinders, shapers and workbench. A Diesel-electric engine supplies the power for operating the various tools. While appearing in a new motion picture “Speed” Westphal, America’s leading glider pilot, set a new record for the west coast by sailing the glider, shown at right, 11 miles in 20 minutes. nother of the motorless planes is shown sailing over & hay- stack while nearby moving picture cameras grind. This plane furnished many breathtaking thrills from the Pacific palisades. 58 Modern Mechanix & Inventions

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Mail Carried One-Quarter Mile ud Model Rocket Plane FTER many attempts to fly a rocket plane across Greenwood Lake, N. Y., into the state of New Jersey F. W. Kessler, scientist and rocket designer, finally achieved his goal. The plane, loaded with 6,149 pieces of United States mail took off from an inclined runway and flew about one-quarter mile before coming to earth across the New Jersey state line. While the plane was expected to make a two and one-half-mile flight its sponsors were, nevertheless, satisfied with results as they represented stamp collectors in all parts of the country anxious to add a rocket flight cover to their collections. New Glass Bends Like Celluloid Dr..G. M. Kline, chief of the Bureau of Standards, Plastics Division is shown here testing the new plastic aviation glasa which has the same flexible properties of celluloid. ITH aviations rapid advancement. the United States Bureau of Standards is interested in a glass for airplane windows which will not crack of break under the un- usual stress. In tests made in the Bureau's laboratories on the various forms of glass a new plastic material proved the most logical successor to that now in use. The plastic glass is similar in many ways to celluloid except that it is free from any yellow cast and will not burn readily. It may be bent to any shape which makes it valuable for curved windows and windshields on both aircraft and automobiles. Although the new glass scratches more easily than the common type government ex- perts expect that a “hard” plastic glass will soon be available for general consumption. Magazine, May, 1936 Sponsored by stamp collectors located in all parts of the country this rocket glider made its first successful flight by carrying 6,149 pieces of mail across a New York lake. Senate Subway Is Safest In U. S. LAIMED to be the safest subway system in the world, the Senate subway, connect- ing the Senate office building with the Capitol, has been operating without a single accident | for the past 24 years. Only two cars are used on the line which operates on an overhead rail system with the current being supplied by a conductor in the floor. The motormen ride in the center of the cars since they cannot be turned around at the end of the run. Each car has a normal seating capacity of 24 and travels at a maximum speed of 5 miles per hour. When installed in 1912 the com- plete system cost the government only $9,500 and in its years of operation has cost very little for upkeep. While only United States Senators may call the cars anyone may ride them upon invitation. Yearly thousands of visitors are offered a “lift” by the lawmakers. Here are some of the visitors to the Natipn’s Capitol riding the sepat subway, the world’: safest. Motormen, like the one here, ride in the center of the car. 59

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EFORE a crowded gallery, Los Angeles policemen were demonstrating their skill at revolver shooting. : One officer lit a cigarette and turned side- ways. The other, having paced off the right distance, took steady aim and shot the ciga- rette in half. The audience was loud in its applause. But one spectator was heard to say, “Aw, that trick-shooting cop has just seen the Annie Oakley movie, and now he is playing hero." “Trick-shooting cop?” Well, maybe. Every police officer in America has dreams of becoming a second Billy-the-Kid. Still, had the caustic gentleman making this remark, been at a certain downtown street intersec- tion recently, he would have been pretty much ashamed of himself. For a “trick-shooting cop” was directing traffic there when it happened. 60 ooting by. STERLING GLEASON The radio police officer is a new breed of marksman, expertly trained to snap-shooting at fleeing targets from emergency positions. The six-gun man of the old West originated this deadly technique, which is simply draw and shoot without seemingly taking aim, But constant practice makes a man 4 dead shot regardless of the target. A screaming motorcycle siren brought the traffic officer to attention. A recklessly driven sedan was hurtling towards him, behind which rocketed the motorcycle officer pouring in lead and receiving a deadly barrage in return. The traffic officer, trained for just such an emergency, shot the driver squarely through the heart as the car flashed by him. Buta burst of death from inside the car toppled that “trick-shooting cop” to the pavement, fatally wounded. The driverless car swerved and crashed, and then there was'a gun battle Up from the pits (left) jump police targets, and the officers pour in their fire. How surely shots are placed is shown in the photo at right. Modern Mechanix & Inventions

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the Guns of Gangland It was Billy-the-Kid’s shooting at moving objects that made him a crack shot of legend. But today, almost any police officer could match him—shot for shot. Read how the police are fast becoming crack shots. royal, for police appeared out of thin air. In the car was found the loot from a bank Tobbery committed only a few moments before. Back of the brilliant shooting which dazzles spectators at police ranges, lies long, steady practice and training which is making police marksmanship feared by the underworld as never before. A modern police department today is really a miniature army, complete from its arsenals, bristling with sub-machine guns, riot guns, high-powered rifles, and side-arms, to grenades and guns which lay down a barrage of gas, There are armored cars with bullet-proof windows, and shielded tires, forming veritable tanks for street war- fare; armored motorcycles with machine guns or automatic pistols, mounted between handlebars. Most important of all, however, is a well- Magazine, May, 1936 Special shoulder stocks (above) fit police automatics, making them precision arms which can be fired with great accuracy. This invaluable accessory assures the officer his long-range shots wil] take effect. ft~Shell reloading. The Los Angeles police reload all their used cartridges. trained line of sharp-shooting officers. In certain cities of the United States, a system of training is fast making every man a crack shot, and as a result, police guns are speaking with new authority. Every month, each man on the Los Angeles force, from the Chief on down, must go to the pistol range to demonstrate his skill with the revolver. On the firing line he finds a dozen or more other officers, also anxious to qualify. In the sunken pits just below the earthen backstops, trusties are waiting, ready to aid by manipulating the targets and re- cording the hits. Speaking into a microphone, a rangemaster directs the fire. At his command, targets jump up from the trench. "Fire!" comes the command. A dozen pistols speak at once. appear in the paper-covered targets. Now, from the pits, bamboo pointers dart upward. Pointing first to each hit, then to a numbered post beside the target, the stick [Continued on page 132] Holes 61

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Exhaust Heats Airplane's Wings, Prevents Ice Forming ol TYPES OF CONSTRUCTION IN AIRFOÍL Heat from the exhaust of this recently patented airplane is forced through the wing structure proving sufficient to keep ice from forming on the wings during winter flights. Rubber Used to Furnish Entire Room O FURTHER its claim as the rübber city of the world an Akron, Ohio, hotel re- cently opened to the public a dining room in which all decorations and furnishings are made of rubber. Murals on the walls depict the various stages in the manufacture of auto- mobile tires from the time the rubber is gathered on the plantations. On the floor rubber covering replaces the more common material giving a softer walking surface. Automobile tires hung from the ceiling form the housing for the indirect lighting. Rubber is also used for furniture upholstery, walls, table and counter tops. All fittings in this original hotel dining room are of rubber including the murals on the walls. Genuine automobile tires form the ceiling lights while miniature ones serve as ash trays. 62 EALIZING that ice forming on the wings of airplanes was very often responsible for winter crashes F. L. Janson, a New York inventor, decided to attempt to perfect a device that would eliminate this hazard. After several years of continued research he succeeded in developing a device which, in the eyes of the patent office officials, was worthy of protection. Aeronautical experts, too, have agreed that the device has possi- bilities. The operation of the ice defroster is simple. The leading edges of the wings are hollow and serve as air ducts through which the hot exhaust fumes pass. The plane rushing through space causes the exhaust heat to be drawn out through the tips of the wings. Baby Carriage Has Stair Climber The young lady shown here is experiencing little trouble in wheeling the carriage down the stairs. Fitted with a cater- piller chain drive the coach may be safely handled by anyone. ONCEIVED by a German inventor a simple baby carriage attachment makes it possible for even a child to safely wheel the cart down a flight of stairs. Employing a caterpillar chain drive the carriage is lowered or raised without undue effort. Not in use, the chain mechanism folds out of the way. Modern Mechanix & Inventions

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Sun's Heat Surpassed by Electric Arc ORKING in the laboratory of North- western University, Professor W.' S. Huxford of the school's faculty has succeeded in producing temperatures greater than the heat of the sun. Special electric ares of pure graphite developed 12,000 degree tempera- tures which were recorded and measured by a radiometer and spectroscope in order that permanent records of the experiments could be kept. Professor Huxford was assisted in his work by Dr. William T. Gray, a former research student, who also helped develop the special apparatus required to measure the unusually high temperatures. : To carry out the experiments the scientists employed special direct current generators which were capable of properly actuating the graphite arc. Show First Diesel At Museum From this crude machine was born the modern diesel motor. The first motor, shown here, is now on exhibit at the German Museutn at Munich and is the invention of the late E. Diesel. OCATED in the German Museum at Munich is the first practical diesel engine ever to be used in industry. The motor, con- structed in 1896 by E. Diesel, failed to meet with the approval of the public at that time and his invention went unheralded until a few years ago. Today this same machine, with certain physical changes, is in great demand. Magazine, May, 1936 Professor W. S. Huxford of Northwestern University is shown here before the electric arc which developed temperatures exceeding the heat of the sun by several thousand degrees. Finds Formula for Synthetic Ice MPLOYING a secret process Edward Kelley, a well known skater of Chicago, Illinois, has developed a secret process whereby ice skating may be enjoyed the year round, A chemical substance, having qualities similar to ice is applied to the skating surface in liquid form. When the material has cooled it is ready to be skated on. Applied to any surface in boiling liquid form this chemical ice hardens in a few hours leaving a skating rink equal to one of actual ice. The chemical may be reheated and used again. 63

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FLOODS —WINTER'S Stalking the coldest winter in years, it sneaks beneath yout door, this fluid snake. And once having watched its tise, you realize that no monster is more to be feared than FLOOD WATERS. Dams which are built for power purposes are often valuable protection against flood losses and damage. HE gentle patter of spring rain on the roof is a positive cure for insomnia. Yet, in Paga-Pago it is practically impossible to out- sleep the “devil-drum” drops, for there the tropical rains are seemingly endless. But, for downright fear of rain, take America’s flood area population just about this time of year. Millions of people worry when it rains in this area. They know that rain melts snow, that snow turns to water arid that water runs downhill. This past winter found the north- - ern states blockaded by one of the worst series of blizzards ever recorded. Damage by snow- fall alone ran into the millions, while the costs in snow removal, delayed transportation and interrupted communication service have not yet been totaled. Added to this was the loss in human life. And still the toll of winter has not been paid in full. There remain the 64 This past winter, worst in half a century, wreaked havoc on transportation, but the Zephyr bowls un- interrupted through drifts at eighty miles per hour. Melting snow now threatens thousands of homes. Utah flood waters swirled down on Salt Lake City, piling up cats in one of Mother Nature’s unusual freak traffic jams. floods, the dread result of the snows melting too fast for nature’s water troughs. Approximately twenty-five million dollars worth of property, not to mention more than a hundred lives were lost when flood waters swept down from the hills in eastern Colorado and southwestern Nebraska early in June 1935. The Republican River, swollen by cloud- burst rainfall, rose to heights never before known. During succeeding weeks similar ` floods devastated parts of Texas, Wisconsin, Modern Mechanix & Inventions

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Devastating AFTERMATH When you view newsreel shots of a flood, think kindly of the airplane pilot. He always directs emergency relief for those in immediate danger. Piled up in Chagrin River, ice floes, the aftermath of the February blizzards, defy dynamite blasts discharged to break jams. Flood waters were sent backwashing through the Ohio countryside before the treacherous jams were finally broken. Ohio, Pennsylvania, and New York. The south central New York floods of July 7 and 8 caused the death of fifty-five people and the loss of more than twenty-five million dollars worth of property. ` When two inches of rain falls in a single day people think they have had an exception- ally heavy storm. When four inches falls in one night they think they have had a cloud- burst. Twenty-four inches, two whole feet of Magazine, May, 1936 by IVAN E. HOUK The house built upon sand or rock is i a “push over” for Ee : Old Man River when y POR he goes on a ram- page. A lifetime of endeavor was wrecked when the house (above) and sur. rounding buildings Iso were damaged. water, fell in southwestern Nebraska that night of June 1. No wonder the Republican River went on a rampage. Bridges were wrecked, railways torn out, buildings de- stroyed, homes washed away, and whole families drowned. This was the most extra- ordinary rainfall ever known in that section of the country. Disastrous floods result from several causes. They result from the breaking of levees, the failure of dams, or the formation and subse- quent collapse of ice gorges. They result from the temporary blocking of stream channels by landslides, snowslides, or ice avalanches from overhanging glaciers. They may be due to the choking of watercourses by vegeation during the late summer months, or to the sudden melting of accumulated snow deposits during the late winter months. Sometimes they result from tidal waves caused by severe earthquake shocks, or from [Continued on page 136] 65

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OF $CIENCE. [naas in this country skimmed petroleum from lakes and sold it to white people as a cure for aches and pains.—George Bowers, Good- ing, Idaho. The human body throws off enough heat in one day to melt a 40-pound cake of ice and bring the remaining water to a boiling point. —Robert Gar- man, Palmyra, Penna. Gold costs more to refine and mine than it is worth. The total sum spent in the quest of gold is estimated to be far more than the worth of all the metal ever mined.—Bert Haun, LeRoy, N. Y. If all the cigarettes smoked in the United States in one year were placed end-to-end they would reach from the earth to the moon with enough remaining to encircle the globe one and one-half times.—Dan Sharpe, Jr., Hertford, N. C. There is enough illuminating gas on the planet Neptune, to supply the needs of earthly beings for 21 million years.—Allen Glasser, Bronx, New York. Carbon monoxide victims die of starvation. The gas forms so stable a compound with the hemoglobin of the blood that the oxygen finds no room for the red corpusceles.--George T. Becker, Wau- watosa, Wis. A dahlia mea- suring 16 feet in height was grown by a New York woman during the summer of 1935. It had eight blooms.— H. A. Morris, Allentown, Pa. 66 ODDA In Russia insects and a species of small lobsters born over 3,000 years ago have been revived and are pursuing a normal existence. —Robert Bacon, Chicago, Ill. One gram. of radium. gives off enough heat to melt its own weight in ice every hour.— Arnold M. Hofer, Bridgewater, S. Dak. Gold may be beaten so thin that 1,200 sheets of gold leaf will be no thicker than a sheet of writing paper.—Aubert Hauenstein, Troy, N. Y. The annual grain movement over the great lakes, amounting to four million bushels, is sufficient to load enough 50-car freight trains to reach from New York to San Francisco five times.—Morris A. Hall, White Plains, N. Y. A watch that misses one tick in ten thou- sand willlose a minute in one week.—Wilmer Armstrong, Merrickville, Ont. The wheels on cars entered in the races at Indianapolis Speedway revolve approximately 330,000 times in completing the 500-mile run. —W. B. Houston, Martinsville, Ind. There is suf- fieient gold in the U. S. Treas- ury to pave a 10- foot highway from New York = to Chicago with . gold !4 inch. thick. — Lowell G. Ferguson, Manteca, Calif. One dollar will be paid on publication for every Paragraph Oddity accepted. State source or proof. Do not include Oddities with contributions or letters for other departments. No items will be returned... Address “Oddities,” Modern Methane Publishing Co, Fawcett Building, Greenwich, oim. * Modern Mechanix & Inventions

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Mighty Excavator Removes 900 Tons of Earth Per Hour HUGE combination excava- tor and dredging: machine, the largest of its kind ever to be constructed, has been recently placed into operation in Germany. The excavator instead of remov- ing earth with a single claw or bucket employs a bucket wheel speeding up the work consider- ably. In a single hour the machine is capable of removing from 600 to 700 cubic yards of solid ground. So large is the machine that double railroad tracks are re- quired to support its enormous weight. The chief operator in order that he may have a clear vision of the progress being made operates his controls from a glass enclosed pilot house located on the crane. Remote control mechanism con- nects the pilot house with the master controls in the engine rooms. In order that the dirt or other materials may be loaded efficiently a conveyor system is employed. Portable Gin Mounts On Truck Ras ES Aa Mounted on the rear of an old auto, this homemade cotton gin removes the material from old mattresses and converts it into clean stuffing which is then blown into the new covering. LD mattresses may be quickly turned in- to new ones with a simple portable cot- ton gin invented by an Arizona man. The device is mounted on the chassis of an auto- mobile and powered by jacking up the back and attaching a belt to the wheel. A number of 8-inch rods welded to the shaft of the gin revolves, passing through a number of small pins set in the side of the device. Cotton is fed into a hopper where it is cleaned and then blown into a new mattress cover. Magazine, May, 1936 Capable of removing up to 1,500 tons of earth in a single hour this German built crahe has a normal output of more removes six times as much soil as the type of scoop commonly employed. than 900 tons. A rotary bucket Piano Folds Into Buffet Cabinet ITH the modern trend being toward useful furniture, manufacturers are constantly seeking ways of increasing useful- ness of their products. Latest of these is an English device which is an attractive buffet cabinet that when opened becomes a piano. . The keyboard folds out of the way in jack knife fashion when not in use and the music rack, too, drops down to facilitate closing of the cabinet. The piano possesses unusual tone quality for its size with all of the features usually found on the most expensive instru- ments. Small electric lights mounted on each side of the music rack provide sufficient illu- mination for the player. Where space is at a premium this compact piano will find much favor. Folded up, the instrument appeats to be a buffet, but when opened becomes a beautifully-toned piano. 67

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Amateurs C. apture ACTION 68 RISON sirens howl as a band of desperate convicts blaze their way out of the penitentiary with smuggled guns. Hot on their trail follows an amateur cameraman. He photographs scenes of the resulting confusion, the hur- ried marshalling of police cars, the armed guards pacing the prison walls, the excited crowd of curiosity seekers, and gets human-interest shots overlooked by professional news- reel men. A famous flyer is forced down far from big-city landing fields—and from the commercial movie reels. His accident enables a local amateur photographer to score a clean scoop which nets him a handsome profit. A spectacular fire, a big marine collision, a flood, explo- sion, or earthquake—all spell opportunity for the hundreds of free-lance amateur cameramen who are invading the field of newsreel photography. The unexpected, always happening, is the amateur news- reel man’s best friend. Although most big news events are covered by pre-arrangement, now and then a sensational story smashes into the headlines, finding news-gathering agencies unprepared. A quick-witted amateur already on the scene may sell his negative to them if he acts promptly. A dollar a foot is the average rate, and sometimes more for At the airport to welcome Amelia Earhart at the end of her Hawaii to California hop was an alert amateur cameraman. She rewarded him with this shot. Another amateur swung his camera into ~ action to get shots of a Chinese New Year cele- ae | bration. Part of the procession is shown at left. Aboye—This is one of the latest 16-mm. cameras for amateurs. The cameraman is placing a filter over telephoto lens to get a close-up of distant action. Left— There are numerous kinks in newsreel work. Here an amateur is using a portable titling board. The titles are let- tered on paper, inserted into holder, and quickly shot. Modern Mechanix & Inventions

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for the NEW'SREELS exin, n. When a peaceful valley suddenly becomes the scene of a roaring flood, the amateur .news cameraman is on the job. Where hurricanes rage or great explosions take their toll, the newsreels depend upon alert This article tells how it is done. amateurs. exclusive, sensational pictures of national interest. Foreign subjects generally pay double. Latest in newsreels is one distributed nationally, once a montb, for home movie projectors. Recently press representatives sat in a darkened Hollywood projection room and watched the first edition of this sixteen- millimeter reel, shot entirely by amateurs, unfold late flashes from all parts of the country. They saw auto drivers speed around a dirt track in a championship race; watched in turn an athletic contest, a spectacular Magazine, May, 1936 parade, and miners panning pay dirt in a new gold rush. They got glimpses of a rare turkey-fish from the South Seas; marveled at an odd, elephant-shaped fungus recently discovered in Nebraska; and watched a thriling undersea battle between two fierce tropical fish. Already two hundred cameramen are covering big news as it breaks, and more are wanted in every section of the country, ac- cording to one news editor. "There are hundreds of news subjects in each locality waiting for you to photograph," he tells his contributors. “You must use your ingenuity and manufacture news, stunts, and human-interest subjects. “If possible, shoot each subject from three different angles—eye-level; high, or ‘bird’s- eye’ angle; and low, or ‘worm’s-eye’ angle. If all your shots are taken at eye-level, break them up in the following man- ner: 1—Long shot; 2—Medium shot; 3—Close-up. Close-ups are the most important shots in newsreel work. The public likes to see the action near at hand. “A tripod is essential, for only in cases of rare and spec- tacular news events—shots that cannot be re-taken—will we accept pictures that are un- steady on the sereen. Don’t panoram or tilt unless abso- [Continued on page 124] 69

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'.justment of 130 to 190 - . water heater. and at ex This modernistic, 40-gallon electric water heatet sets flush with the wall in the - — modern kitchen. All wiring . and plumbing is concealed im the base. Thermostats provide a temperature ad- degrees. Right— Here is a corner of the all-electric — kitchen. At left is the treme tight is the ice box. 70 rere rr da n Here is the complete ‘electric ; kitchen. range. It contains | two ovens for baking at high and low temperatures simul- | taneously. Lights illuminate the ovens when the doors are opened. A master clock can turn burners on or off at pre- determined times and also -time other electric appliances. — ` The whole stove is stainless. The increasing use of electric appliances has. resulted in the overloading of ordinary home wiring. As a result, this new system has been deyeloped. First the current needs of the whole house are estimated and the correct sized wire is tun from the power.lines to the totaliz- ing unit, or general control box. Ranges, water heaters and other fixed equipment are then wited independently to the-box. m i SSA LOCAL mrri CIRCUITS. AMIE) BREAKERS DEEL Next feeder lines which supply the rooms with current are run to local circuit break. — ers, These breakers act as independent fuse boxes, and each one is affected only ‘by the current being consumed by its own ‘branch fines. The result is that no "matter how many appliances may be oper- ating on branch lines of one circuit breaker. the lights in the house do’ not dim or flicker, or the radio lose volume. Modern Mechanix & Inventions

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PLANTS GROWN Without EARTH in SEALED BOTTLES These plants are growin of natural soil. in sealed glass bottles without the use Miss Clara Hires, who created this odd form of plant growth, finds markets for her plants in all parts of the world. AISING all kinds of plants in sealed glass tubes and bottles is the unusual hobby of a former New Jersey school teacher, Miss Clara Hires. So extensive has become her work that several assistants are needed in order that the striking plant formations may be shipped promptly to all parts of the world. Educational authorities acclaim her for mak- ing it possible to study every stage of a plant’s growth, including the roots. Chemical soil is the substance which made the growing of bottled plants possible. In- stead of growing the flowers in earth they are planted in a jelly-like substance which con- tains the vital growing chemicals and the necessary moisture. As soon as the roots be- gin to form around the seeds their growth may be followed through the transparent soil and later when the plants begin to shoot out they, too, may be examined daily. Being sealed, nothing is ever added to the bottle nor is it necessary to supply the plants with water as a process of condensation is in effect continually inside the bottle. With each change of temperature the mist rises, collects on the inside of the bottle and then rains back on the plant. The plants are exposed to daylight, but not bright sunlight as the glass, acting as a lens, would burn up the plants in a few days. Miss Hires permits the plants to remain in the bottles until they are large enough to be set outdoors in natural soil. Magazine, May, 1936 Trains Tested In Wind Tunnel N ORDER that British trains may run at maximum efficiency engineers of the Lon- don, Midland and Scottish Railway have constructed at their Derby locomotive works a wind tunnel for testing the various types of locomotives. The tunnel, the first ever to be constructed in England, is used to determine the best streamlining for the line's locomo- tives. Models which are exact replicas of the actual motive power are placed in the tunnel and a blast of wind, produced by an airplane propeller, is set in motion. The models, supported on cords are pushed forward by the wind and streamling effects recorded. This design engineer of one of England's leading railways is measuring the effects of wind on the speed of the different types of locomotive models to determine value of streamlining. 71

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Science Makes Artificial Radium In Million-Volt Tube Professor Lauritsen and his associates at the California Inetitute of Technology are shown before the glant tube used in making artificial radium from lithium, lightest metal known. Robot Bookkeeper Actually Thinks LIMINATING all possible chance of errors occuring in bookkeeping and ac- counting a new machine, recently introduced in New York City, is far more accurate than any human being in keeping records. Special automatic mechanisms operated by electric motors handle the various accounts giving both sub and grand totals. The machine which operates as a com- bination typewriter, adding and bookkeep- ing machine is expected to save users thou- sands of dollars through its elimination of errors.. This machine is neither typewriter or adding machine, but a device that keops book accounts accurate- ly. Operation is fully automatic. 72 SING a tube carrying potentials of 1,000,000 volts Professor Charles C. Lauritsen and his research assistants at the California Institute of Technology have suc- ceeded in producing artificial radium that is more powerful than the genuine metal. Dr. Lauritsen and his colleagues, Wilson Brubaker and Lewis Delsasso, using the lightest metal known, Lithium, transformed it into beryllium forming a metal with unusual energy próducing properties. The new metal, being even more powerful than radium itself, requires special care in handling as burns might prove harmful. Lead shields are used by the scientists so that they may study the metal and still be free from its effects. The actual radium, costing thousands of dollars to refine just a minute quantity, is in great demand by hospitals and clinics. Tiny Engines Propel Model Planes Powered by miniature gasoline engines these model planes are for a race near Miami, Florida. The planes are lined up read of the youths shown preparing them for flight. the handiworl FEW years ago model airplanes powered by rubber band motors were being en- tered in model airplane competition through- out the country. Most of these models are capable of making flights of very short dura- tion only, but with the coming of the minia- ture gasoline engine all of this was changed. Recently at Miami, Florida a model plane contest was staged in which all planes were built by youths under sixteen years of age and each being powered by midget gasoline en- gines. Many of the models remained aloft for more than one hour and could have con- tinued in flight had it not been for the fact that they carried only a small fuel supply. Modern Mechanix & Inventions

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Super-Speed Turbo-Plane to Span Ocean by DOUGLAS P. ROLFE IVE hours out of New York and the flasher lights of the Central London Air Terminal are blinking their welcome to the Trans-Oceanic express as it glides to a swift, effortless landing. Five hours out of New York! This and similar pictures of future transportation have been painted ever since man first flew, but today it can be said that this is no idle fancy or paper prophecy. Even the most casual review of various activities in the United States, Great Britain and France show the vast number of experiments that are now be- ing conducted towards this very end. Whether the final success of trans-oceanic flying lies in the development of huge flying boats such as the China Clipper, or in some radically different type of boat is a question no truly progressive engineer would care to answer. This much they will say—that speeds of 500 miles an hour or more must be regarded as commonplace. Fantastic and dangerous as such speeds THE CONSTANTLY RISING CURVE OF AIR SPEEDS IS GRAPHICALLY TRACED IN THIS CAREFULLY PREPARED CHART.... NOTE TERRIFIC 'AND STEADY INCREASE OF AIRPLANE SPEEDS, SINCE 1919, ANO TREND OF COM- MERCIAL AIRPLANES TO FOLLOW CLOSELY SPEED CURVE PRODUCED BY THE: RACING TYPES OF PLANE HIE : | 2008 PEER REESE rt FEECED ERES] EIS CEA CCELI [ILL : BEBE HIS E MEE RENEMN MIN LhRL.-LLCCLLEDU LC eM m [D LLLEELILCLLILLERLLLA [LI T ia EEH CEECEE] ttit i" LI CIL LELI rj» T" Corr [T eel a LI E LI NE 1904 1909 1914 1919 Magazine, May, 1936 With wings reduced to a minimum this trans- oceanic plane is planned to span the Atlantic in five hours. In place of numerous motors blanketing over-sized wings, this craft uses a single power plant installed in the hull to drive a series of small, variable pitch blades constantly revolving about the circular ship. appear to us now, it must be re- membered that 20 miles an hour was regarded as being equally dangerous not so many years ago. The entire history of the motor car and airplane has been one of increasing speed. Again; the history of car and plane alike points to the fact that speeds de- veloped in racing models are rapidly transferred and absorbed by the commercial patterns. So swift has commerce been to adapt the lines of speed planes that to- day in the United States there is the extraordinary situation of regular air liners being. miles faster than the majority of the world’s best military pursuit planes. Racing planes are now assault- [Continued on page 126] 73

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RobertPage Lincoln, huntin, and fishing edi- tor, holds up a small mouth bass he caught in a Minnesota lake. Mr. Lincoln has fished the small mouth from East to West and his findings are told in this article, HILE the large mouth black bass is generously distributed throughout the country, its close relative, the small mouth bass is likewise to be met in choice lakes and streams in the United States and Canada. Game and fish departments, recognizing the unusual gamey qualities of this species have extended the range into places where it was never found before. As a result small mouth bass are now being taken in great numbers _ west of the Mississippi, while previously they ` were found only in the East. -. The small mouth bass is a firm, compact fish, with far morẹ symmetrical lines than the large mouth. When a large mouth bass goes over three pounds in weight it will "belly down" as the saying goes, its E DORK RINO SPINNER Fly Rod Fishing for by ROBERT PAGE LINCOLN abdomen hanging more or less flabby and soft to the touch. The small mouth bass, regard- less of its size, retains its original lines, has a firm abdomen and does not have a flabby stomach as does its relative. The small mouth bass has no stripe on its side. Its coloration varies with. the region and the water. You may take.a small mouth bass in one section of the country that is quite greenish; in another section, brownish in color while in still another the fish is likely to be much barred and blotched, which arouses no end of speculation as to whether or not it is a different species. Because of its stream nature the small mouth bass, to a great extent, takes on some of the characteristics of the trout in that it feeds on insects along the shores very much as does the trout. By reason of this fact fly fishing has long been a favorite method of taking it. The flies used are generally tied to No. 1-0 hooks, the O'Shaughnessy hook bend, in the so-called hand-forged type, being the most desirable. These bass flies are made in the standard regulation variety, embracing . Such well-known patterns as the Grizzly King, Yellow Sally, Coachman, Royal Coachman, Professor, Red Hackle and many other colors and combinations of colors. Ninety per cent of the flies as used on the small mouth bass are Above-—Typical small mouth: bass water," Like trout, small mouth thrive in fast water, though now, planting, many are caught in lakes and ponds. Left—Here are some typical bass baits designed for the fly fisherman.

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Second only to the trout in fighting skill is the small mouth bass. This vigorous watrior spells thrills galore for all fisher- men. Prepare to land him by reading Mr. Lincoln's article now. quite large, the No. 1-0 being the all-around size. There are times, however, when smaller flies will prove effective on many streams, especially where the water is clear. Such flies should range No. 3 to No. 6 in size. The best type of bass fly is one without any wing feathers, with just the hackles at the head of the fly, which, in the No. 1-0 size are an inch or more in length. A fly of this sort can be worked nicely in the water, and, with twitches of the rod tip, each individual hackle filament can be set into action, giving an open- and-close effect to the lure that is extremely life-like. As opposed to this, a fly possessing stiff, upstanding wings has little or no action to it at all, and merely turns and flops from side to side, imitating nothing and taking less. Bass flies in the No. 1-0 size and in regula- tion patterns are often used in combination with a small No. 2 gold or nickel-plated spin- ner on a shaft. By reason of the interchange- able snap-fasteners or sliding coil-fasteners BABY BASS MU on these shafts you can take off one fly and put on another in a few seconds time. Re- gardless how flies are used when fished with- out the spinner arrangement, those having stiff, erect wings are out of the question when used with spinners. The wingless, hackle or palmer type of fy works most effectively with the spinner arangement, and is to be highly recommended. By way of explanation, a hackle type of fly such as the Brown Hackle has hackles concentrated at the head of the fly only, with the body bare. In the Palmer . type the hackles.are distributed along the whole body, the same fairly bristling with these filaments. Both of these types are to be given first place among flies as used on small mouth bass in fly fishing. Combined with the tiny spinner, the fly of either variety is ideal and most effective. Lures for the small mouth bass as used by means of the fly rod are many and various. Aside from the spinner and regulation bass flies, as used under the water surface, there are bass bugs of many kinds. "These bass bugs have cork bodies and float. They are less [Continued on page 128] On still water such as shown below there are bass bugs in a host of varieties that are extremely effective. Some of them are shown at left. These are used with a strong fly-rod, and are cast up on logs, overhanging grass, or boulders and then dropped into the water. This means action. ~~

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French Mail Planes Cross South Atlantic On 3-Day Schedule Here is the Santos Dumont, first of the heavier-than-air trans-Atlantic mail carriers. It carries mail from Europe to South America in 3 days, covering more than 9,000 miles. Next 4 Years To Be Wet and Colder OLTE winters and wet summers is the fore- cast for the next four years according to H. H. Clayton of Canton, Mass. Mr. Clayton, who predicted the drought of the past five years, and the extreme cold of the present winter, bases his predictions upon the cycle of solar activity as indicated by sun spots. Cocoanut Novelties Prove Profitable UTTONS and buckles of cocoanut shells have provided a profitable sideline for Pierre Bouchard of Miami, Fla. For tools he uses only a pocket knife and a set of files. An interesting variety of colors ranging from ivory white to a rich mahogany may be produced by selecting cocoanuts in various stages of ripeness. The shells must be left to season in the sun until all of the natural oil has been baked into the fiber. A soft hand- rubbed finish brings out the beautiful color- ings left by the oil. Only a knife and a few files are needed to make profitable novelties out of cocoanut shells, Pierre Bouchard has discovered. - RANS-ATLANTIC air mail service by heavier-than-air craft, anticipated in the near future for the North Atlantic, has been placed in operation between France and Brazil by the French. The new service pro- vides three-day service between the two con- tinents. The trans-Atlantic mail planes run on weekly schedule, picking up mail from France and England and delivering it to Rio de Janeiro and Buenos Aires three days later. The trans-Atlantic plane makes connections with the South American trans-continental plane, and letters from London reach Santi- ago on the west coast of Chile within 4 days. - The total length of the new mail route is 9,365 miles, of which 2,300 miles is directly across the Atlantic. The great flyingboats are powered with three motors equipped with triple bladed propellers. ‘President Has “Official Forger” Louise Polk Wilson is the “official” forger of President Roosevelt's signature. he is the only one authorized to sign his name and she has done so more than 11,000 times. UTOGRAPH hunters and hobbyists who have discovered President Roosevelt's signature upon certain patents of the General Land Office will find they have the only "official" forgeries of the President's signa- ture in existence. Miss Louise Polk Wilson of that office, namesake of two presidents, is the only person who has been authorized by the Chief Executive to sign his name. Modern Mechanix & Inventions

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WhatNewlnventions AreNeeded? 0 FIRST PRIZE. . . . . . $25.00 IN CASH SECOND PRIZE . . 10.00 IN CASH THIRD PRIZE . . .. . 5.00 IN CASH THREE FOURTH PRIZES . . . 29.00 EACH FOUR FIFTH PRIZES. . . . . 1.00 EACH TOTAL—10 PRIZES 50.00 IN CASH OR years this magazine has been publish- ing in its Needed Inventions Department the germs of ideas which are now yielding their inventors thousands of dollars in royal- ties.. Some who are profiting from these suggestions are professional inventors, but more often than not some reader who had never before invented a thing would dis- cover the solution and profit accordingly. Inventions breed inventions. The invention of the locomotive led to the development of the automobile, street car, and ultimately the airplane, the progress of each being accom- panied by thousands of contributing in- ventions. Everyone SIDE MIRRORS Sharp eyebrow lines so essential to the well groomed lady can not be obtained from a dull eyebrow pen- cil. Women will be glad to pay well the inventor who produces a pencil that is self-sharpening. Magazine, May, 1936 00 in CASH PRIZES FOR BEST [IDEAS has ideas on how these can be improved further, and inventors want your ideas. You will want other readers’ ideas. To make this exchange of ideas still more interesting, MODERN MECHANIX & INVENTIONS MacaziNE will award $50 each month for the best suggestions for needed inventions. First prize will be $25, with nine other cash prizes as listed above. The rules are simple and are listed at the conclusion of this article. Your needed invention can cover any field, and the simpler it is, the better. As an ex- ample, this month there are described a few simple needs for milady’s dressing table. You [Continued on page 130] Much to be desired is a triple vision. hand mirror that will hold its position open or closed. A perfume vial that prevents evaporation is an item also needed. 77

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Glass Gabrics Startle batting held by the Few would guess that the fi But it was, and young lady was made of glass. so were the spools of yarn, "is woyen mat, the bundles and block of insulating material and the screened air filter. Even the wall is of glass. This is not snow but glass, the same kind from which bottles are made. One pound -of this substance contains enough fibres to reach around the world. Each strand is 1/20th the diameter of a hair; 100 are needed to make No. 50 thread. 78 Fashion: Experts Here are some more glass products. The hat is knitted of blue glass as was the hand bag, At the left is a ball of glass yarn, and to the right of the glass "pillow? is a spool of thread and a coil of glass rope. The woven rug is made of glass also. Here the piss batting emerges from the spinner. In the new process glass fibres are drawn at the rate of 260,000 feet a minute, more than 200,000 feet a minute faster than a rifle bullet. This batting has remarkable acoustical properties, and also can be used in this form for home insulation. OR centuries the glass industry was con- tent to make windows, tableware, and lenses. There was little else to be done, as glass was "too hard and brittle" for other purposes, in the opinion of most observers. Suddenly, however, modern science has changed all that. Within the past 12; months glass has beet made strong and resilient enough to make diving boards; glass blocks as strong as mor- tar have been used to make factories; glass cooking utensils have resisted the heat of open flame, and now comes a glass soft enough to be spun as yarn or thread. Glass clothes are no longer an improb- ability. Already it has been woven into hats, rugs, shawls, insulation for wires, and ropes. Modern Mechanix & Inventions

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Atomic Twins Separated To Form World's Smallest Solids HE determined assaults made by science upon the atom within the past year have opened entirely new fields to the experi- menters, and it is expected that the next 12 months will find the mystery of atomic structure entirely dissipated. Following close upon the heels of the newly perfected atom-smashing cyclotron comes a device from the Bartold Research Laboratory at Swarthmore, Pa., to separate atomic twins. Dr. L. H. Rumbaugh is the inventor. In this machine the electrons and pretons are sepa- rated to form the smallest, lightest bodies on earth. It will be used to further atomic re- search in fields hitherto untouched by scientific experimenters. Small Air Conditioner Saves Fuel This pedestal type air con- ditioner operates from any 110 volt electrical outlet and requires only an oc- casional filling of water. It contains an electrical heating element which vaporizes the water, mixing the vapor with air drawn through a filter. Should the 1l5-gallon water tank run dry, the heating ele- ment is automatically shut off. Due to the fact that humidified air is warmed efore being circulated, the fuel bills are reduced. PORTABLE air conditioner has been produced which can deliver filtered, washed air with no attention other than an occasional filling with water. It operates from any electrical outlet. Air is drawn through a filter, mixed with a steam vapor created by an electric heating element and circulated through the room with a fan. Magazine, May, 1936 Here is the latest machine developed to study the action of the atom. It separates atomic twins, producing the smallest solids on earth. It was invented by Dr. L. H. Rumbaugh. Thin Vanes Form Non-Skid Tread UBBER fins which remained on a tire long after the treads had worn out provided the clue which led tire engineers to develop a new type of tread composed of thin rubber vanes. The vane treads fold over upon en- countering an obstacle, thus saving wear on the tire. Quite by accident it was found that this folding action stopped car 25 per cent faster than any other type of tread. On curves the vanes lean sideways, giving more traction. Col. Roscoe Turner, famous speed flier, is shown here examining the latest type of tire tread. The thin rubber vanes of this tire form a serpentine tread when brakes are applied. 79

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Home Scientists DLE THIS WASH- BOARD repre- sents a whole laundry in it- self. It is de- signed for small apartments, camping trail- ers and other locations where economy of space is desir- able. The wash- board contains soap rack, wringer and a self- supporting back rest. It can be used in a tub or in a'small basin. AIR CONDITIONED RE- FRIGERATOR keeps bread and cakes fresh for weeks at a temperature of 40 to 50 de- grees. No frost forms in the compartment, and food such as bananas, caufiflower, and celery can be left uncovered, HERE IS A BATTERY CHARGING WASHING MACHINE. In rural homes where electricity is not available, this new washing machine charges the radio battery while doing the weekly laundry. The gener- ator is mounted on the motor platform and usea a belt drive. It does not affect the motor power. THIS TIME SWITCH modernizes old washing machines by making them automatic. Listed on the dial is the water temperature and washing time necessary for fabrics. 80 Modern Mechanix & Inventions

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Texas Centennial Exposition Will Be Shown In Miniature The wealth of detail included in the exposition models can be seen in the construction of this fountain. Right—Trees made of sponges grace the lawn of the model livestock build- ing. Note the miniature reflecting pool. ISITORS at the Texas Centennial Ex- position to be held in Dallas this summer may see the entire world’s fair at a glance as a result of the construction of a scale model replica of the buildings and grounds. The miniature fair grounds, occupying 900 square feet, was built by Juan B. Larringa. For materials he used panel board, plastic wood, sponges, mirrors and paint. His models include hanging gardens, illu- minated basins, lagoons, fountains and real- istic shrubbery. The Centennial group in- cludes 16 permanent buildings, 16 semi-per- manent exhibit halls, an amusement midway, race track, athletic bowl, auditorium and im- pressively huge entrances. Thousands of visitors from all parts of the world will view the exposition. Magazine, May, 1936 A bird's eye view of the Texas Centennial Exposition will be furnished by these models being built by Juan Larringa, shown finishing the food products and agri- cultural building. The poultry building is at left. Device Fits Gloves Scientifically O FIT gloves scientifically a new device housed in a plastic case gives finger length and palm breadth in terms of glove sizes. A moveable: button shows the length of the middle | finger while a strap measures the palm. The ‘readings are shown on dials. This new machine measures the length to fit scientific. accuracy. 81 palm and finger gloves with

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In this machine the plastic mixture of linoleum begins to take shape as a rug. Burlap from the long roll in front passes into the “calender” and there huge rollera press the linoleum mixture into the fibere to form a strong backing. Circle—Here is the molded inlay table where colored linoleum mix is sifted through pattern stencils onto the burlap back. Each color has a stencil cut to match perfectly with others to fill design. HROUGH all the centu- ries man’s progress is re- flected in the homes he has kept, and is readily traceable in the floors of those homes. Prehistoric men paid little at- tention to floors, but when the long arm of the Caesars reached out into the Orient, they found floors of inlaid ebony, teakwood, mosaic and pearl, but only in the homes of the rich. In 1863, Fredrick Walton, a youthful in- ventor of Yorkshire, England, made a great discovery in an open paint pot, over the con- tents of which the usual scum had formed. Turning his inventive genius to the matter of a use for this tough scum, he developed the idea for a new material which brought fine floors within reach of the average family for the first time. By mixing a small quantity of gum with the oxidized linseed oil, which he had dis- covered in the paint pot, Walton found that he had a very satisfactory binder for ground cork and color pigments when pressed onto a backing of burlap. So began the great in- dustry that today extends into every country. He called his invention ‘“linoleum”—from linum, the Latin for flax, and oleum, oil. 82 An inventive mind and a can of paint left open by acci- dent were the co-founders of the great linoleum in- dustry. Its manufacture is as strange as its origin. The manufacture of true linoleum involves several major operations, developed first by Walton and used by linoleum manufacturers with but slight modification to this day. The steps are as follows: First, the cleaning and grinding of the cork and the selection of the burlap. Second, the making of “linoleum cement” from linseed oil. Third, combination of the cement with cork powder, wood flour, minerals and color pig- ments to make “linoleum material.” Fourth, the application by heat and pres- sure of the linoleum material to the burlap base. Fifth, the seasoning or hardening of the fin- ished linoleums in great ovens in which the linoleum is baked for months on end. Modern Mechanix & Inventions

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Another Industrial Accident The Mediterranean countries of Portugal, Spain and Algeria contribute cork. Cork has certain qualities possessed by no other materials, notably its lightness combined with strength, its elasticity, its imperviousness to air and water, and its insulation qualities. The cork is run through huge grinders, and then between enormous stones where it is ground so fine that it resembles talcum powder. India grows jute, a reed whose strong fibres are woven into burlap. Only the Scottish weavers at Dundee weave burlap of the fine and even texture suitable for use as a backing for linoleum. Every yard is closely inspected so as to make sure that the burlap is free from knots and heavy fibres and of balanced strength between its width and length. Linoleum “cement” is made from linseed oil and certain resins, which properly combined and treated, form a tough, rubber like material of great strength and endurance. Mineral color pigments, obtained from various parts of the United States, are also an important factor, since bright and colorful patterns have come to be much in demand. Finely ground wood flour helps to carry these brilliant hues. [Continued on page 120] Cork, because it is tough, spongy, resistant to oil and water, and of great insulation value, is used extensively in making linoleum. It is ground into a powder as fine as flour. Magazine, May, 1936 More than a mile of lino- leum is baked at one time in this oven, Baking lasts from three to six weeks while linoleum cures. In this rotary inlay machine, lino- elum “blankets” in solid colors are die-cut into small blocks, which ere automatically shuffled into intricate designs. e pattern, fitted. to- gether like jigsaw blocks, is then drawn between presses where heat welds the material ino a solid sheet. This process is easily distinguished from stencilling by ita clean-cut lines. 83

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: Into these spheres Prof. Pauthenier has crowded nearly a half-million volts. Dust particles ionized jn a tube accumu- late in the spheres to build. up the 450,000 volt tension. Mirror Checks Faults Of Oarsmen HE perfect muscular coordination re- quired in varsity rowing has been greatly expedited by the use of mirrors, Coach Rusty C. Callow of the University of Pennsylvania has discovered. The team memhers are seated on a rowing machine placed before a large mirror, and as they go through their strokes, their faults are pointed out in the glass. Once they actually see their mistakes, they lose no time in correcting them. Varsity crew members see themselves as others see them, and in this way correct themselves in half the time, Coach Rusty Callow believes. Hie is shown correcting a team candidate. 84 Dust Powder Ionized In Tube Builds Up 450,000 Volts TREAMS of dust, finer than flour, have made possible the construction of a high potential generator which can create a ten- sion of 450,000 volts. Prof. Pauthenier of the Faculty des Sciences de Paris is the inventor of the new process. To produce the enormous voltage, dust powder is injected into a tube, the axis of which consists of a metal thread carrying a tension of 10,000 volts. As the dust becomes ionized upon contact with the wire, it is drawn into sphere approximately 2 feet in diameter. Here, by the process of accumula- tion, the tension is built up to 450,000 volts. Cut Flat Tire Toll iJ d Road Magnets s. Here are potential “flat tires” by the bushel, picked up by this electric magnet after a football game at the Rose Bowl. Each pound of metal represents 63 possible tire hazards. HE war on flat tires being waged by powerful electric magnets mounted on trucks has been entirely successful, reports from all parts of the country indicate. South Dakota, during the past year, collected 52,395 pounds of metal from its roads, enough to cause 3,300,000 flats. At the Pasadena Rose Bowl more than a ton was collected after a football game. Modern Mechanix & Inventions

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Small Airliner Is Fastest In Service ECOGNIZING the need of a fast economical airliner to serve private industries, small airlines, and feeder lines of the major airlines, the Lockheed Air- craft Corporation of Burbank, Cal., has designed an 8-place, twin engine craft with a maximum speed of 231 miles per hour. The new plane is constructed of aluminum alloy with skin- stressed wings of advanced de- sign, The wing spread is 49 feet, six inches and the overall length is 36 feet, 4 inches, of which: 14 feet, 8 inches is cabin. The cabin is sound proofed throughout and equipped with special ventilators. In the rear compartment and in the nose 450 pounds of cargo can be stored. At sea level the plane will take off in 600 feet and climb 1400 feet per minute. Pontoon-Glider Stunted By Youth Franklin Woolcott, left, and Don Stevens inspect their stunt- ing pontoon-equipped glider. It is launched by towing it with a fast boat or airplane, It can be looped and rolled. LYING stunts such as most pilots believed could be accomplished only in a power plane haye been performed in a pontoon equipped glider by Don Stevens, 21-year-old flier of Glendale, Cal. Soaring over the bay, Stevens swooped down over a speeding motorboat to pick up his partner, Franklin Woolcott, as just one of his many daring sunts, which include loops, rolls, and vertical dives. Stevens has performed for the newsreels and one full length movie feature. Magazine, May, 1936 tries, and as a feeder plane for the major airlines. 2 pilote, and a 450 pound cargo at speeds up to 231 miles per hour. T valid This is the new Lockheed 12 designed for small airlines, private indus- It carries 6 passengers, Carrier Pigeons Turn Cameramen OMETHING entirely new in aerial pho- tography has been developed in Munich, Germany. In place of trained photographers carried aloft in airplanes or observation balloons, camera equipped pigeons are re- leased to fly over the object to be photo- graphed. The pigeons do not fly at random. Months of training and selection are required before a few birds are chosen for camera work. Then their flights in each direction are timed so that the trainer knows exactly at what time the bird will be over a certain point. It is then a simple matter to time the camera to expose the film at the point desired. The cameras do not impede the flight of the birds. So valuable are these expertly trained pigeons that breeding stock often brings more than $2,000 per head. These aerial photographers fly over a cettain course every day and their flights are timed. Thus the trainer can adjust the camera timers to snap any desired picture on the course, 85

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Having stripped his machine of everything save the bare essentials, this rider prepares for the start of a Tourist Trophy race. Motors are started after flag has been dropped. NE of America’s newest and most excit- ing sports is misnamed: there should be an “N” between the initials of T. T. rac- ing, for there are few forms of excitement that contain more high-explosive qualities than this motorcycle pastime. A T. T. race is an American, and usually a miniature, version of the famous Tourist Trophy races held yearly on the Isle of Man. It is a motorcycle contest packed with thrills, spills, dust, speed, breath-taking moments and a lot of fun for everyone concerned. It looks like an elaborate and noisy way of committing suicide; but surprisingly few bones have been broken in such competitions. In fact, women riders frequently tackle the milder parts of a T. T. course. Let’s accompany the Ohio Ramblers on a Sunday afternoon visit to their T. T. track, which is scarcely a year old. The Ohio Ramblers is à motorcycle club, made up of riders who live in and near the city of Mas- sillon. The Ramblers' track is, so the club mem- bers claim, one of the most perfect in the 86 Breath-taking leaps of 50 feet and more are made' on one of the pre- pared jumps of a hurdle for a 25-foot jump. Small tracks provide numerous big thrills. Facking Thrills the T. T. track. This rider takes a stock machine over by WALTER E. BURTON state, if not in the country. It is the result of a long and careful search for just the right kind of land. An outstanding feature is that spectators can stand on top of any one of several neighboring hills and view the entire course. There are no large trees in the area, only a few shrubs—mostly bushes bearing long, sharp thorns which riders have learned to respect. This being merely an informal practice run, the machines are standard in design and equipment. For actual racing, special stripped motorcycles generally are used. All of the riders wear leather crash helmets as a matter of protection. The starter drops the white flag. The mo- tors, which had been dead, leap into action, and in a flash the sextet is roaring around the first turn. This is a very mild turn, being only a right-angle one, partly banked. Hardly have the machines straightened out when the leading one strikes the first of a series of hair- pin curves. Some of these curves are tilted at dizzy angles on the side of a hill. Now the skidding cycles have negotiated them safely, executing in the process a few dizzy and dust- raising fish tails, and are headed down a short but steep bank preparatory to making a sharp right-hand turn and climbing to the top Modern Mechanix & Inventions

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Here is another view of a motorcycle stripped down for some fast work on the T. T. track. Right, above—Taking the turns on a well planned course. As the riders plunge over the steep embankment, they are confronted with a sharp tura to the left and another steep hill. Such riding tequires skill. in a Motorcycle T. T. Track * ==> FOR SHORT RACES ^f un WRITE = Ce FIELD of the steepest and tallest hill on the course. When the dust clears away, a rider is seen struggling to his feet. His machine is lying on its side a yard away. The five remaining machines, after engag- ing in a short but lively hill-climbing contest, have reached the high point of the course, and have idled down for the next test. This is a descent of a rocky, loose-dirt hillside that would make a mule pause and consider. But the motorcycle roughriders do not hesi- tate. Down the hill they slide, and skid around the sharp turn at the bottom, shower- ing the surrounding bushes and a few ven- turesome spectators with dirt. There are two sprawling flops on this bottom turn, but the riders are up in an instant and on their way. Then come a series of up-and-down, waves Magazine, May, 1936 " STARTING AND FINISHING - LINE SHARP TURN La Above—Loose rocks and gravel are pur- posely left on the track to further test of the skill of the rough-riders. Left—This proposed course, patterned after the Massillon, Ohio, T. T. track, packs as many thrills in its half-mile length as most cross-country tracks. Notice the jump into the plowed field near end of course. scrambled with a few more hairpin turns, and the motorcycles are on the home stretch. There remains one more formidable obstacle. The track has been dug away to, produce a sudden rise of perhaps two feet, over which a rider has to leap in order to complete the run. Because stock machines are being used the cyclist hop this miniature cliff with con- siderable caution, flying through the air per- haps only 10 or 15 feet. However, in actual competitions, when stripped machines are being used, riders sometimes make broad jumps of 60 feet, and clear the ground by 4 or 5 feet. ~ And that, in brief, is what a run over a T. T. course is like. For the most part, the ma- chines travel in low gear, although.on some [Continued on page 126] 87

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Camera Brings Surveyor's Field Indoors work. stands camera. From across the pond the gentleman appears as little more than a speck upon the film. Accurate measurement of his image, however, reveals that he is standing just 258 feet from the camera. Thus the distance across the pond is found. SING his camera as a transit, a Denver mining engineer has discovered a new method of bringing the outdoors into his photo-laboratory for leisurely surveying. A magnifying glass, ruler, and an easy chair have been substituted for rod and chain. The first step in the process is to measure the height of some object in the foreground of the land to be surveyed. This object is then photographed at a measured distance from the camera such as at 50 or 100 feet. “If the object is a six-foot man standing 100 feet from the camera, his image will show on the film approximately %4-inch tall. In each film in which his image appears as 14-inch tall, he will be 100 feet away. If his image is but ¥%-inch tall he is 200 feet away, and if but 75-inch tall he is 400 feet away. By drawing a center line on the print a little measuring will give the degrees to right or left, while a level line through the middle of the pictures will give the elevations. Thus a six-foot man photographed on a knoll en- ables the surveyor to determine the elevation of the knoll, its distance to right or left of any line, and its distance from the camera. 88 The camera surveyor brings the outside indoors This man, 6 feet tall, exactly 34 feet Distance is measured. Keeping the telephone pole within focus, the 6-foot man moves across the gully. His image, compared with the one in the circle, gives his distance from camera as 86 feet. for leisurely from With the telephone pole still within focus, the gentleman climbs a distant knoll. The distance between his image and ~ the centerline of the film gives the elevation of the knoll, and the size of his image, when compared to that in circle, gives distance to knoll as 207 feet. A box camera can be used. New Safety Glass Bends On Impact NEW resili- you: RE ent safety glass yields likea safety net when struck, and does not scatter in loose pieces. A clear, rubber- like gum is used to bind the glass sheets together. A bag of shot dropping with great force failed to burst through this new type safety glass. The new glass also reduces excess eye strain. Modern Mechanix & Inventions

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Boost Short Wave Set's Volume With "2-in-I" Amplifier RE you one of the many radio fans who has been seeking a simple amplifier for use with your homemade short wave receiver? If so, here is an amplifier that is not only simple, but practical and one that will deliver plenty of power. The secret of this device is in its tube—the 79 TWIN. Having two sets of like elements this tube is actually two tubes in one and when used in a resistance coupled amplifier circuit takes up very little space. The total cost should not exceed $2.00. The chassis is constructed from sheet metal bent to form as shown. If desired a bakelite panel can be substituted instead, but the former is best. Drill holes in the ends of the chassis for the input and out- put (speaker) terminals, tube socket ahd cable. Mount the termi- nal strips and socket with small machine screws and wire up the various resistors and condensers. These should be of the pigtail type so as to eliminate all unnecessary wiring. The resistors need not be very heavy, 42-watt sizes will be plenty large. The condensers should have a 200-volt rating. By following out the pictorial parts layout even the most experienced should have no trouble in getting the amplifier to work. If desired the builder can purchase a small metal cash box in the 10-cent store and use this for a chassis. It is not necessary to adhere to the dimensions given here as these are merely for suggestion. The amplifier is operated on 90- volts of B current and 6-volts for heating the ' tube's filament. Current for operating the amplifier may be taken from the same source that supplies the power to radio set. If desired the B current may be increased to 135 volts although it will function very well on less. Magazine, May, 1936 AND INPUT AMPLIFIER SPEAKER SCHEMATIC 19 TUBE E ‘79 SPEAKER LM —* DIMENSIONS SHOWN OB+ 90-VOLTS QB- O .© 6 WLTS D.C.OR AC. Ke In wiring up the amplifier care should be taken so as to make the connections to the tube correct, otherwise the amplifier will not function. to any radio tube chart for the socket connections if not familiar to you. Refer Magnet Aids In Coil Winding HORT wave' coil winding can begreatly simplified by using this novel arrangement. Wind the coil. wire on a tin spool and slip over a wooden Shaft mounted between the poles of a magneto magnet. Magnet provides perfect tension. This simple magnet arrangement permits the radio fan to wind his own short wave coils very easily. 89

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A Studio Type Microphone for the Amateur MICROPHONE unit of the condenser type that will rival the professional studio device in both results and appearance can be con- structed by any ambitious radio experimenter in afew hours. Since the microphone "head" re- quires special machine work it is cheaper to pur- chase the kit ready for mounting. This is avail- able from most radio supply houses at a few dol- lars, The amplifier case is made from a 3-inch bake- lite or hard rubber tube 6 to 8 inches in length: Inside is mounted the various parts wired up ac- cording to the diagram. The amplifier consists of a type '19 tube connected in a resistance coupled circuit. A wooden dise mounted in the end of the bakelite tube supports the tube socket and various parts. A suspension ring is made from the bracket of an old radio head set. A small metal ring is soldered to the end of the stem so that the unit can be suspended on a cord. The earphone ring permits the microphone to be tilted to any de- sired angle. A strip of metal 74’x14”x314” is SCHEMATIC bent into a clamp for holding the mike “head” and mounted on the bottom of the microphone gol MG housing with short machine screws. TO DIAPHRAGM ) Metal bands around the ends of the tube help guis icd Mr to enhance the appearance of the completed in- strument. A four-wire shielded cable leads from the microphone to the regular amplifier. If 15 sratog the cable is of any great length a matching trans- merSbHone former is required. Be certain that all connections are made exactly as shown in pictorial diagram. The microphone case is constructed ac- cording to the detailed dimensions shown SOLDER " OUTPUT -3 below. The end discs are enameled TO CONDENSER +135 -135 black and held in place with short wood oS S screws. Studs are used to support the MICROPHONE socket on base. The earphone bracket is spread so as to fit end of bakelite or fiber mike case. / EARPHONE È” i cai BRACKET FROM OLD HEADSET If the builder desires he can mount the microphone on a stand as shown above instead of using the microphone sus- pension ring as suggested in the diagrams. The parts are wired up by following the pictorial or schematic diagrams at left. It is very important that all leads be made as short and direct as possible if efficient operation of the microphone is expected. 90 Modern Mechanix & Inventions

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Kinks Suggested By MM Radio Experimenters ` COTTON ROPE (BOTH ENDS) -«—— 25' BETWEEN POSTS —X»- STRANDED BARE AERIAL WIRE STAL > SRYECTOR j RAM 7 piack =. TO AERIAL CRYSTAL DETECTOR si STAND [2 ARRESTOR * POTENTIOMETER CIRCUIT : pare nares RP CHOKE CONTROL 2 ya MH . APPROX. 00025 MED. 9e - VBROADCAST TYPE. $ : i BRADLEYOHM RHEOSTAT 4 MFD. OR - (10 WATT) P4 Ol MED. ae FEN B+ 75,000 OHMS 45 NOLTS Using this form of regeneration control in any simple shortwave recelver will improve results greatly. The Bradleyohm resistance is adjusted so the regeneration control works smoothly into regeneration.—W. Freye, Two Rivers, Wis. Magazine, May, 1936 à LIGHTNING ` Li € a [| WATER PIPE GROUND | An ordinary crystal detector connected in series with the antenna lead-in of most modern electric receivers will, in many cases, improve reception when affected by electrical interference caused by motors, light flashers and X-Ray machines. By adjusting crystal detector much of this nolse can be eliminated.—Paul E. Slater, Kansas City, Kan. £ TN Wm | i TACKS ARE POUNDED HALF WAY INTO BACK OR BOTTOM SIDE OF ANY SUITABLE PIECE OF FURNITURE EVERY ROOM" AERIAL The reception of many types of radio receivers M will be improved greatly through the use of this simple self-contained antenna. driven in the back of the cabinet support the antenna which is threaded back and forth.—A. Ogren, Chicago. Static in automobile radio receivers has been traced, in a number of instances, to dry wheel bearings. The noise was checked to thie point and upon greasing all wheels with graphite the noise ceased, While not a sure cure it will oftentimes work.—C, EB. Semkus, Sag Harbor, N. Y. 91

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PRACTICAL IDEAS FOR SHOP USE Gear Makes Swivel for Vise LARGE gear wheel, which may be se- cured from any junk yard, forms the necessary materials needed in converting any stationary bench vise into one of the rotating type. Remove the vise and attach a steel or iron plate slightly smaller than the root diameter of the gear, itself, A bolt passes through the plate permitting its rotation while the vise is mounted in turn to the plate. Cut two grooves to take the “stop dogs” so that the | vise can be held at any angle.—W. Wilhite.

14 erate. PLATE I$

UT OUT HOLE JUST LARGE H ENOUGH FOR BOLT NUT BOLTS HOLDING LOT SLOT STEEL PLATE

Simple Device Cuts Round Belting HE shop man can make his own round leather belts for his light shop machinery by using this simple homemade cutting tool. <A piece of sheet iron about 3"x5" and 4” thick has a number of holes drilled in it varying in size from 14” to 7”. Cut strips of leather with — ,,4.. T a pocket knife in the manner shown, mount metal plate THROUGH HOLES in a vise and pull the strips through the desired size hole. i

fetp By ebcks “= WS | Roofing Paper Cut On Wire Rig UTTING tar paper or any other heavy stock is made easy with this cutter which uses a wire instead of the J <| usual blade yet makes a clean cut. The cutter consists of ARPAPER A ee war | tour identical pieces of stock mounted as shown and pro- Si essem | vided with a hinge at one end to facilitate operation. A cutting .| light steel wire is attached to the open end of the frame g E A and the wire passed beneath the frame with a wooden handle attached to the other end. To use the paper cutter place the roll of tar paper on a flat surface and unroll to the desired length. Slip the paper between the hinged section then close and hold firmly. . A sharp pull on the handle will result in a perfect tear. It is important that the cutting wire is steel as a copper wire will A Small Crane for Sh op Use break too easily.—Adolph Tabako. ADE from heavy angle iron and a few lengths of pipe this small portable crane will simplify the lifting and transporting of heavy objects about the machine shop or garage. No dimensions are given as the size is dependent upon the use to which the crane will be put. The entire crane can be put to- PAGE ae Z gether with stove bolts or welded. To lift ite A E heavy objects the leverage handle should be = long. For light objects the handle may be a COTTER pen short one.—T. L. Moore. HOLE MANNER oF MANNER. OF ASSEMBLING 92 Modern Mechanix & Inventions

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Reading Your TWO TYPES OF ae IS A DI na READ + 61,65! CUBIC FEET PRESENT READING - 61,651 CU. FT. LAST READING oh 101 CU. FT. CONSUMPTION 550 CU. FT.” READ METERS FROM LEFT TO RIGHT GAS METER VS READ = 821,100 CUBIC FEET CENE rages CU FE LAST T CONSUMPTION E a 200 CU. F ELECTRIC METER KILOWAT? HOURS READ 3,046 K.W.H. MURUS rss atis ito [KILOWATT , PRESENT READING 3.046 KWH $ HOURS} LAST REA -2,804 KWH“ CORSUMPRON. 249 « 4H Y UNDERSTANDING the operation of your gas, electric and water meter and checking the readings from month to month quite a few dollars can be saved in the yearly publie service bill. To many this seems like too difficult a task to attempt, but meter read- ing is quite simple after you once get the knack of it. The first thing to do is to determine the amount of fuel a certain appliance consumes. Let us take the water heater for example. Turn off all other appliances, light the heater and then retire to the basement. Read the meter dial settings, making a note of them on a slip of paper. Allow the heater to burn for Magazine, May, 1936 Home Gas and Electric Meters CUBIC FEET ON DIAL MARKED 1000, EACH NUMBER RE- PRESENTS 100 CUBIC FEET -— THEREFORE ADD 2 CIPHERS (00) for Profit EC READING METER GAS METER READING Read the numbered dials, right to left ignoring test dial. Smaller of the two figures between which hands stand are read. Last dial is marked 1,000; each point is equal to 100 cu. ft. Adding 00 to numbers shows consumption as 821,000 cu. ft. Subtracting last reading from this shows amount of gas used. WATER METER READING One kind is Two types of water meters are in service. read directly and the other in the same manner as the gas meter. ELECTRIC METER READING Read in the same manner as gas meters except that no ciphers are added to numbers read. Determine current consumption by reading smaller figures between which pointers stand. ten minutes then shut it off. Now note the dial reading and subtract this from the first setting. By repeating the process, but adjust- ing the flow of gas through burner the most economical consumption can be determined. Itis not the wide jet that speeds the cooking. In most instances a jet only partly open will cook foods quicker than one open fully yet save gas at the same time. While the electricity flow cannot be adjusted in the same manner as gas, money can be saved if you are paying for your current on a minimum basis. In this way there is no cur- rent paid for that is not used. By checking your meter you can use the. exact amount of current allowed in your minimum charge by the power company. This same rule applies, too, to minimum charges made for your water supply. 93

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Plans for "LITTLE BEAR" O HOLD the tiller of a sensitive racing yacht, is now a thrill to be had by any- body who builds a Moth boat according to the accompanying plans. It is the smallest sailing yacht with an International Racing Association. As five of these inexpensive little craft form a divisional fleet, it is an easy matter to have sailing races on almost any lake or river in the country, and at the same time have a boat for use in state, national and inter- national regattas. The Moth described in this article, which can be built with ordinary tools, was designed by Captain Joel Van Sant, originator of the Moth Class. It is specifically known as the Potomac River model and is quite fast. With watertight bulkheads at Stations No. 2 and No. 5 it is unsinkable and, although of the scow, or skimming dish type, its lines are graceful and pleasing. An experienced boat builder only needs to glance at Figures 1 and 2 to build the hull. But certain specifications are necessary for those unfamiliar with this type of craft. Before going ahead with any of the actual construction work the very first step is to thoroughly study the drawings—particularly those in Figure 2 which give all the necessary dimensions for laying out the full size plans —an essential preliminary in building any boat. The line dimensions, you will notice, are given as to the outside of the planking. Therefore, in laying out the frames, it will be necessary to deduct the thickness of the planking used—in this instance one-half inch at all points involved. A study of Fig. 4 will clear up this matter for any who find it obscure. In this diagram the lines dimensions at Station No. 3 are given and the limits of the planking indicated. From your full size drawing you now make paper patterns for the frames and the keel, always remembering to allow for the plank- ing thickness. Full details of the frame construction are covered in the drawings—particularly clearly in Figures 4, 5 and 6. The bow plate, covered in Fig. 10,is sawed out of a piece of solid white oak. The transom is simply a piece of 1” white oak or mahogany cut to the angle pro- duced on your full size drawing. It is best to put the bevels on bow plate, 94 Above photo shows the original Moth as designed by Captain Joel Van Sant in 1930. The Moth type yacht is the small- est sailing craft with an International Racing Association. transom and frames after they are set up. The frames are joined with brass screws as shown. With the frames built you ean turn your attention to the remaining essential frame member—the keel. The keel is formed from one 12-foot length of fir or yellow pine, 4% inches wide by 9$" thick, and a 12-foot length of 14-inch white oak, 24% inches wide. The two are firmly screwed together forming the section shown in Fig. 8. Fig. 7 shows the method used to set up the keel. A 12-foot length of 2”x12”, or 14”, planking is sawn out so that the exact curve or line of the keel, fore and aft, remains, the necessary measure- ments being taken off the plans. With the keel set up in the mould, or jig, fasten the frames in place using brass screws throughout. The bow plate and stern transom are next screwed to the keelson and braced firmly with 114" or 1%” oak knees as shown in the inboard profile drawing, Fig. 1. With bow plate, transom and all frames in place, temporary braces are secured to the sides to hold the frames rigid while notching Modern Mechanix & Inventions

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“MOTH” Class RACER them for the chine and the deck clamp. These notches should be 34" by 1" and are clearly indicated in frame detail. - — TANG-MAKE GF 3|" Next fit the chine pieces and the deck ERE BRASS 8 REPRE clamps, bevelling the frames as needed. Two CLEVIS PIN 9”x12” planks are then clamped in position, marked off and sawed to shape. These will form the sides of your boat and they may be of white cedar, mahogany or redwood— 14" thick. (Note: Either 34” or 14” planking is specified but the accompanying drawings show half-inch planking throughout.) Fasten the planks to the frames, deck. clamp and chine with brass screws, then loosen the keel former supports and turn the boat over, still leaving it attached to the jig you have em- ployed to shape it. The frames may now be notched on the : : MRIGENG US under sides for the seam battens, as shown is : GALY CABLE in Fig. 5. The number of planks used on the er bottom, of course, determines the number of eee SAIL TRACKS * seam battens, but if you use 8-inch planking as shown, there will be two battens on each side of the frames. The battens, of 14”x2” spruce are fastened with brass screws. You are now ready for the bottom plank- ing. This may be either mahogany, cedar or " EXE eT a OVI IE FIG. 2 - COMPLETE PROFILE AND CROSS-SECTION LINES HUTTE BEARS — A MOTH RAGER TUN DIMENSIONS ARE TC-OUTSIDE OF PLANKING — i BowPLATE | CENTER SHEER 4 MEER LINE PARALLEL = TO Suit: P o: io^ x Ha cL ZS P au CELLA T TI 24" pa" QuTsoe CORNER | ta wht e -a — Peat i dy ial a BASE LINE HALF-BREADTH CROSS-SECTIONS OF TRANS IND FRAME STATIONS- Fig. 3, above right, is a general vlew of the completed Moth and rigging. Inset shows the details of mast head. In Fig. 2 note that station dimensions are to outside of planking. See Fig. 4 for construction. Cut rudder to shape shown above. After studying above drawings, lay out plans full size with’ a 12’ batten. Full size plans supersede any minor deviations. Magazine, May, 1936 95

Page 96

Centerboard Adjustment Made When in Place COMMERCIAL PINTLES AND GUDGEONS OAK TILLER NOTE: Deck CROWN TO SUIT BUT CURVE OF 4* IN 48" 13 RECOMMENDED. ALL DECH BEAMS OF 7 8» MAN AND #3 (W.T, BULMHEADS) 16* TRAVELLER 1 U2* OAK KNEE TRANSOM - |? Oak OR MAHOGANY. FIGI ILITTLE BEAR". A MOTH CLASS RACER Above—Note shape and dimensions of centerboard in the cross-section drawing. stations 2 and 4. Watertight bulkheads are at stations 2 an 1/2" CEDAR DECKING MUSLIN SET IN PAINT FEET AND INCHES- The centerboard trunk is fitted between For the bottom planking, either !⁄-inch cedar, mahogany, or redwood may be used. The garboard strake (next to keel) must always be the first plank to be fitted. redwood, %” thick. The garboard strake, or plank nearest the keel, is fitted first. Plane off the shoulder of the keel to conform to the frame sides and coat it with thick paint or marine glue. The batten is similarly treated. Then screw the garboard strake securely to the bow plate, to each of the frames and to the stern transom. Put some good screw fastenings along the edge of the keelson as well, and then use copper clinch nails or rivets, spaced about 2” apart, to secure the plank to the seam batten. The jig or former, may now: be removed from the keel. Take out the screws and plug the holes tight. Then rip the centerboard slot. This slot should be 12" wide and its size and location can be taken. off the drawings, Fig. 1. Fig. 9, in conjunction with the inboard pro- file drawing, Fig. 1, explains the simple con- struction and fitting of the centerboard trunk. The trunk is fastened to the keelson by 3" brass screws driven up through the keel. Do not drill the hole for the centerboard adjust- ment until later when you have the center- board in place. With the centerboard trunk in place the next step in order is to make the deck beams. These may be crowned, or rounded, to suit individual ideas but a four- 96 inch in four feet curve is recommended. Make a master mould and saw or steam bend all the deck beams to this mould or jig, estab- lishing the widths required from the posi- tions shown in the deck plan. The deck beams themselves may be of %” by 114” or 14” oak, or you may use a lighter material. The beams at the watertight stations how- ever should be in all cases 1”x114” material as shown in Fig. 6. The deck beams are screwed in place at all frame stations and also where shown in the deck plan, Fig. 1. Where the cockpit occurs, put in full beams, sawing out later after decking. One thing remains before laying the deck. This is the installation of the mast step and partner. The decking, of 42” cedar, is secured to the deck beams with well countersunk finishing nails. It is laid fore and aft—the same as the bottom planking—and you will find that four-inch planks are the best. With the deck nailed down and the nail holes filled with white lead, plane and sand the entire deck down until it is perfectly smooth. Then cover with heavy paint or marine glue and stretch muslin smoothly over the entire surface, bringing the edges down over the side planks about one inch Modern Mechanix & Inventions

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Mast, Boom Must Net Exceed Three Inch Diameter SCREWED JOINT Eig. 4- Hane STN A STATON SECTION AT STATION ma Ec] y CUT PLANK AWAY TO » CONFORM TO THE EXACT i CURVE OF THE KEEL ~ SEE 1G.2 FOR PROFILE LINES he, xi ne K ,/ OR SPRUCE oan 5/8* FIR, OR FiG.8 SECTION THRU KEEL ——— SS} CANVAS GASKET PIVOT HOLE N E KEEL SON» EEE 5 NOTCH FOR CHINE STRIP 1V2" x I" oaK FIG. 9- CENTERBOARD TRUNK COAT ALL SEAMS AND GASKET WITH THICK PAINT- FASTEN TO KEEL FROM UNDERSIDE WITH 3° SCREWS SCREW KEEL TO | FIG. 5 - DETAIL OF FRAMES SHAPED PLANK DEES NSS NOTCH FOR CHINE & CLAMP N JIG FOR KEEL WITH PLENTY OF WP. GLUE Figures 4 to 10 show some of the finer details of construction. A : Vise / NS =, /ATERTIGHT. BULKH'D. FIG. 7 - TEMPORARY D SECT AT go T. ANK FIRMLY In laying the keel (Fig. 7) tbe member is firmly screwed into the mould of the cut-ouc plank to be released after the frame is built up to a point where it will hold in shape. before tacking muslin down permanently. At this stage the hull should be painted with a good coat of white lead and oil. The rudder explained in the drawings may be either of one-inch oak or 10-gauge metal. The spars are planed round with a uniform dimension. The “Moth” class boat does not permit mast or boom to exceed 3” in diameter. Actually a 3” diameter mast and a 2” boom will be found to achieve average requirements. A 5%” sail track is put along top of the boom and on the after side of mast. The sail shown in the drawings, Fig. 3, is the largest permitted in the class. The metal fittings are few and simple. It is recommended that all of them be obtained from commercial sources. The chain plates are attached to the side planks and to the prow. Five-inch turnbuckles are large enough for the standing rigging which is regular 4%” stranded galvanized cable. The running rig- ging is of 35" manila. The peak halyard, is run through the sheave shown in the detail Magazine, May, 1936 sketch on Fig. 5 to a check block on the mast. A traveler is needed for the sheet as also one cr two small blocks. The flooring, which is of 12" cypress, is laid lengthwise as shown. The cockpit coaming should be 3$" ma- hogany or oak; splash boards are of the same material The final touch is to put on the moulding which is half round mahogany or cak and is leid along the edge of the deck covering the tacks which hold the muslin covering. OTHER BOAT PLANS AND PROJECTS Plans for building 20 kinds of water craft from rowboats to motor cruisers are fully described in the new HOW TO BUILD 20 BOATS book, available at 50c, postpaid. More than 35 boats are described in MM’s free blueprint catalog. Blueprints of LITTLE BEAR greatly enlarged and printed on durable blueprint paper can be secured at $1.50 per set. Order from: Modern Me- chanix Publishing Co., Greenwich, Conn.

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PREPARING THE HOME FOR SPRING ml M MAKE THIN MIXTURE OF NO. 8000 OR eases 10,000 ALUMINUM BRONZE PAINT AND Sp ray Incr Life of Screens BRONZING LIQUID, APPLYING TWO COATS TO SCREEN WITH INSECT SPRAYER CREEN doors and windows may be pre- Ying pared for summer use by applying one PANT | or two coats of aluminum bronze to the Screening using an insect sprayer or paint gun. Mix No. 8,000 or No. 10,000 aluminum bronz- ing powder with a sufficient amount of bronz- ing liquid so that it will pass through the sprayer. Ápply an even coat to both sides of the screening and when dry follow with a second coat. Screens finished in this manner will not rust and will, of course, have a much longer life than those not treated.—Oley Ward. Steering Wheels Make Garden Hose Reel PAIR of old automobile steering wheels and a length of iron pipe make an excellent hose reel for the garden. Mount the wheels on a length of the original steering post, clamping them in place by tightening the set screws. l^ CONS Make the reel from the iron pipe to which has A A SPACED ON LC been attached a pair of tees, Anchor the other ends i COUN of the pipe in the ground. The reel may be mounted K REEL RESTS ON in a vertical position if desired.—A. Hoff, UNSIGHTLY RUSTY ABEN" 9s COLLAR PLACED OVER WATER PIPE Storage Racks Made from Auto Radius Rods WO radius rods taken from old cars can be used around the home for a variety of purposes. Mounted ovryw | in the ceiling of the garage or basement they make ideal i : cross FE | racks for supporting pipe, lumber, ladders and numerous RETAIL OF C Ab other articles. A feature of the racks is that they may be swung out of the way when not in use. The radius rods can also be used for table or bench legs or even saw horses. Use a length of 2"x4" stock for cross members and at each end bore a shallow re- cess for the ball on the end of the rod. Attach bearing cap with screws and tighten until legs are rigid. — W. Wilhite. Cloth Swab Paints Inside of Rain Spout LTHOUGH the outside surface of water spouts receive sufficient protection little attention is given to the inside of the pipe where it is really necessary. By paint- ing both the inside and outside surfaces of the pipe its life will be nearly doubled. To paints the inside of the pipe secure a bunch of rags, a stout cord and a weight. Tie the rags up into a ball and attach to one end of the cord, Weight the other end and drop down spout. After pulling rags into pipe pour in paint then slowly pull cord until rags and paint pass through.—E. J. Novak. 98 Modern Mechanix & Inventions

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Kitchen Utensils Make Professional Photo Enlarger HIS practical and very novel photo en- larger was constructed from readily ob- tainable parts yet has the appearance and does the work of a professional type instrument. The base is made of wood, 34"x13"x15". The focusing shaft is mounted along one of the long sides using a pulley to support it. The 12" shafting is bent from a 2 foot length into the shape shown. The lamp housing consists of two aluminum mixing bowls about 7 inches in diameter, aluminum cup about 3 inches wide and the same depth and a porcelain ring socket. Cut a 315-inch hole in one bowl and a 234-inch hole in the cup. Mount these together using machine screws. This unit contains the lamp sccket and bulb, Next, cut a 34-inch hole in the other bowl and around hole attach a 1-inch strip of tin, painted black. This ring is at- tached with small tin angles. Cut a piece of opal glass for a light diffuser and insert over hole. Screw a 60-watt bulb in socket and at- tach bowls together with bolts. Make the holder for the lens from a 115-inch black iron pipe nipple, 14% inches long and provided with two lock nuts and attach to a cup similar to the one used in making the lamp housing. Cut cup down to about the size shown and fasten to the negative holder, in the 3-inch opening, with small brads. The negative holder is a simple wooden frame and slide made as shown. Use your regular camera lens by attaching to nipple with metal plate. A pair of laboratory ring stands are The completed photo enlarger does not appear to have used to adjust the focus of the enlarger. been constructed from cooking utensils yet such is the case. Placement of all parts is clearly shown. The completed lamp housing as it appears before bolting the f ERN. two bowls together. 4 f 3" OPENING The opal diffusing p glass lays in bottom of the lower bowl. Details of the lens mounting is shown at n : MEE wETALPLATE B D right. Note the meth- at 4 4 E NEGATIVE od of fastening lens 3 j HOLDS LENS ANC 3. HOLDER s to nipple and mount- z 4 ing of the aluminum cup to bottom of negative holder. Nip- ple permits vernier focus adjustment. F^ NUT E E. Details of the negative holder and lens mounting BOLTED TC CUP ASTRONG CLAMP: shown above. The small negative holder is made in the same manner as the regular printing frames. Magazine, May, 1936 99

Page 100

“Chinook” A MIDGET GAS

This is Chinook com- pletely assembled with gasoline tank and spark coil in place. Shaft is to take a pro- peller 13 inches long on a model airplane. À A.C. MIDGET SPARK PLUG

ALUMINUM ER Ss HEAD c rm m | HOLES FOR Al jM SPANNER WRENCH e| E T ezz zN nu IRENSTEA =<. e zi o. c Lum ^"

" : “a2 - CYLINDER EXHAUST PORT (CAST IRON) 2596 , CRANKCASE (ALUMINUM) ALUM! NUM PLATE E: CLEARANCE HOLES ` Eu -.J0 GAS TANK — T7. LA URETOR Drawings above and at right show assembly and dimen- sions of crankcase and cylinder. Both are castings, but can be turned from solid by cutting various pro- jections separately to shape and brazing whole together. 100 BRASS SPRING Simplicity of construction makes this engine an ideal project for the home shop. lt can be used on four-foot model planes or with a water jacket can be installed easily in midget power boats. by WESTON FARMER HE Chinook is so named for the hot dry winds that sweep across the middle west during the summer time. It will provide such a breeze for the running of any small 4’ model plane or enough power for a model boat. It can be built by anyone who has access to a lathe and a drill press. It may also be built as a marine engine, by leaving off the cooling fins and pressing on a brass barrel between the top and bottom fins to serve as a water jacket. Provided thus with a three-inch flywheel, it will reliably power a small model boat of 24 to 30 inches overall length. The operating principles of this little gas engine are explained in the sketches. It isa two-cycle engine. As the piston nears the k *%2 top of the stroke, a vacuum is formed in the crankcase. This vacuum draws gas through the hollow crankshaft from the simple carbu- retor, or mixing valve, on the under side of l-Ve— d. CRANKCASE DIMENSIONS

IIIIE C.R.S, PROP. COLLAR FILE FLAT A ON OPPOSITE Šoe OF PORT FIBER COLLAR CLAMP Modern Mechanix & Inventions

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ENGINE FOR YOUR MODEL the shaft housing. The spark explosion sends the piston down. At the bottom of the stroke a transfer port on one side and the exhaust pert on the other side of the cylinder are opened. The burnt gases escape, while the fresh gas in the crankcase is forced through a slot in the piston wall through the transfer port into the cylinder. - The crankcase on a two cycle engine is the most important part. In Chinook, the draw- ings show the proper dimensions for an alumi- num crankcase which is intended to be cast. If you do not have a foundry handy, it can be turned and milled from the solid, with minor variations. In preparing the pattern for the casting do not bother with shrink rule. The ' pattern is too small to be affected by shrink- age. Make a split pattern, using generous core prints, and the result should be a smooth casting. Chuck the piece in the lathe, face off the rear end, then drill a 36" hole through the bearing boss. Into this is pressed a drive fit This Fairchild model plane is powered with a Chinook engine. Motor weighs only 12 oz. complete. A 5^ MAKE SAME SHAPE AS EXHAUST PORT NW i i: Left—Front view of motor. Orig- inal model had bent rod instead : of knurled knob on carburetor. BAFFLE Above—Cylinder removed, showing PLATE piston and connecting rod of engine. PISTON - TURN FROM CAST IRON BLOCK BRASS SPRING Right—Carburetor is simply mixing valve. Air, sucked through 3,” hole, mixes with gas from needle hole. Timer is brass spring resting on cam and brass clamp. Below — Crankshaft as- sembly. Intake hole traps gas from carburetor, passes it to crankcase. DRIVE FIT BRONZE BUSH- ING BEARING BOSS STIFF WIRE V jgROD: m : SERRATED COLLAR “SOLDER CARBURETOR PROPELLER XE d COLLAR ye ^L At top—Exhaust manifold and transfer port cover are cut from sheet brass and soldered or brazed. Rib in transfer port may be omitted though it improves efficiency of motor. Slot in piston allows gas to pass from crankcase to port. Magazine, May, 1936 : : 101 (soLiD DuRAL) SWEAT COLLAR ON HERE CRANKSHAFT (c.R.5.)

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Lapping Method Insures Smooth. Running Engine Ábove—-Size of cylinder. Transfer port is un- covered. Right—-Good method to lap cylinder and piston. Use water soluble valve grinding compound, starting with coarse and finishing with fine grade until a mirror-like finish is obtained. PISTON TIMING CAM SEAL WITH LIQUID GASKET MATERIAL * Above—Seal all joints with gasket material when assembing. Note timing cam which permits spring to drop completing spark contact. Clamp is insulated from crankshaft housing. Right--Wiring of the model gasoline inp. Battery and coil ground leads should be securely connected to engine. bronze bushing. This bushing is reamed out to take the 7%” crankshaft. Remove the case from the chuck, square the cylinder land face, smooth it off, and drill the hold down bolt holes, as well as the tap holes for the 2/56 filister head machine screws that hold on the 35" aluminum back plate. This back plate is held sealed by the use of liquid gasket material obtainable at auto supply stores. Drill out the carburetor intake hole with a i5" drill, shove the reamer through the bear- ing hole to clean off the burr, and the bearing 102 OC LLL eS TO GROUND M. TO SPARK PLUG GN yy POSITIVE BATTERY LEAD f TO INSULATED COLLAR and crankcase are prepared save for the carburetor. The carburetor is simplicity itself. It is merely a mixing valve, placed low in the engine to feed into the rotary valve, which prevents the engine from “Two Cycling”, or reversing. Through the sleeve of the intake pipe run a 1%” drill. Tap one side. On this, the right side facing the engine, insert a small brass sleeve 45" dia. into which a 45" rod has been tapped with a 72 thread. This rod con- Modern Mechanix & Inventions

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Operating Principle of

Model Engine Is Simple

Right—Theory plained. Hole low crankshaft Side view of engine, showing position of tank and spark coil. iming points are open. his is an indication that piston is on the exhaust stroke of cycle. stitutes the needle valve, and must be pointed on one end. In the opposite side of the intake, a short 12" length of steel with a needle hole, drilled in with a jewelers drill, is sweated. To this tube is doped a small rubber hose running to * the toothpowder can which has been re-sol- dered to make a gasoline tank. The needle of the valve inpinges against the needle hole, and regulates the film of gasoline flowing into the intake. On the shank of the needle valve a small serrated collar is soldered. From the 3%” retaining tube a piece of stiff wire is run to bear on this collar to prevent vibration from disturbing the mixture. This engine has fixed timing in the interests of simplicity. The brass spring running from the little knob on the bearing, bears against a cam cut into the steel propeller collar. This cam is made by filing a flat spot 74” in depth with a 14" face, placed opposite the opening in the hollow crankshaft. This c.r.s. collar is 44” diameter, and the face of the cam is 4%” wide. The collar is secured to the crankshaft by a drive fit, touched with a bead of solder to sweat the two together. A touch of a sol- dering iron will loosen the collar and it may be reset to suit your idea of correct timing, but in practice it has been found best, with an engine made from the plans shown here, to set it opposite the intake port on the crank- shaft. Magazine, May, 1936

Propeller above is cut from 1%" by 13" block. cycle Chinook ex- valye admitting gas from the carburetor.

be Ye >l GAS COMPRESSED: PROPER INSTANT 1 FOR SPARK - N CRANKSHAFT TURNS TO HERE BEFORE PORT CLOSES of two in hol- acts as

POSITION OF VALVE FROM FORWARD AFT —-

PORT HAS ADMITTED ABOUT HALF CHARGE. THERE IS LAG DUE TO INERTIA OF GASES AP INCOMING GASES FROM . [== CRANKCASE DEFLECTED <A UPWARD BY BAFFLE PLATE

ho `E XHAUS X GASES po POSITION OF VALVE LOOK- ING

REVER CLOCK Wise

On exhaust stroke valve in crankshaft is closed, gas from crankease rushes through pis- ton and port into cylinder while burnt gases escape. Change valve position as shown above for anti-clockwise engine. TRANSFER AND EXHAUST STROKE The wiring for the timer is orthodox. One wire is grounded from the coil. The other wire leads from the coil to the insulated collar which is clamped around the bearing boss. Two platinum points off an old model T coil furnish contact, and when the cam rolls around the circuit is made. When the circuit is broken, the coil sends a hot spark to the plug. The spark plug is à midget. The sec- ondary wire from the coil of course leads to the spark plug. Across the contact points a small wireless condenser is bridged to reduce the sparking at the points. One wire of the battery goes to the post in the coil, the other 103

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Engine With Water Jacket Powers Model Boats Chinook is easily marined. Fins ate turned off and cylinder jacket turned out as shown. Brass flywheel is secured by hex nut sweat soldered to lock it in place. Scoop at bottom of model boat forces water to engine. Outlet should be as near top of jacket as possible to pre- vent steam pockets, Carbu- retor placed as shown by dotted lines develop more power in marine version. FLYWHEEL BOTTOM OF BOAT to ground. Construction of a spark coil suit- able for this model was described on page 96 of the April issue. Ready made coils can be purchased from model supply houses. The cylinder is of cast iron. The pattern is so simple it will require no explanation, ex- cept to say that no attempt should be made to core the bore, the ports, or the fins. They can, in one job, be turned off on the lathe, and the ports can be routed out on the drill press in far less time. Chuck the casting in the lathe and face off the cylinder skirt. Bore succes- sive holes through the bore, increasing the size of holes by 14" until the bore 34” is reached, when it should be reamed with a parallel reamer. Final finishing is made by lapping _ the piston. The length of the cylinder is nominally 2”, as shown on the drawing, but it is the usual practice for model makers to make this length slightly longer, so that the final length and the cutting of the thread for the cylinder head can be made to just clear the baffle plate on 104 SOLDER 6 NO. 2-56 FILISTER HEAD ALUMINUM HEAD (SLIDE FIT IN CYLINDER) Ll LLLA Li, LIQUID GASKET MATERIAL CMI SAAN) c 2 > b t c > o x m 4 ESSSS water outer 0.4 JAP 5-40 FOR Vg COPPER TUBE [7 - H ZZ e td 4. .1 NOTE: CARBURETOR FOR "€ MARINE USE MAY BE Li LEFT AS IN AERO EN- GINE , OR PLACED HERE (SEE TEXT Outside top instead of inside of cylinder is threaded for marine use. Head slide fits into cylinder. Head is easily removed by unfastening screws. Below—-Statting the marine engine. STRING TIED WITH SHELLAC USE CORD STROP FASHION TO STAR MOTOR the piston. When this length has been deter- mined from the job, the cylinder may be re- moved, cut to length, and the seat for the 72 thread for the cylinder head can be turned in and threaded. The ports are finished off by drilling suc- cessive holes, and finishing true with a file. Tap the port cover screw holes and then make the port covers. The intake transfer port is made of 20 gauge brass, filed to shape. A light brass cover is fitted in and silver soldered. The port is gas- keted with liquid gasket material. The exhaust manifold is made the same way. Cut the cover plate from 20 gauge brass. Shape the manifold out of sheet brass and [Continued on page 128] Modern Mechanix & Inventions

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SCREW HOLES SLOT FOR SAW " 8 METAL 2 PLATE ~> POSITION OF HARD- ENED STEEL PIN 2a"x ie" HOLE BLADE I", WIDE X 15 RS THICK STRAP IRON z Ue s POWER WOOD SAW constructed from a wash machine motor, hand saw and a few pipe fittings. Assemble on a base as shown below. The ec- centric wheel is a V pulley with abolt on which saw rotates. A light spring provides the pressure for saw. SING materials found on the local scrap pile the enterprising shop man can make a number of practical shop machines at little or no cost. The construction of the power saws shown here are made clear by the illustrations. It is only necessary to fol- low the diagrams in order to secure satis- factory results. While these machines will, in most in- stances, operate on a %4 H. P. electric motor a large size motor can be used to advantage on the power wood-metal cutting coping saw. The power hack saw and wood saw require only a light motor for successful operation. Magazine, May, 1936 uoo FSRS D x 2o 89 = ~ n M POWER COPING SAW made from an old ^S auto motor by stripping it of everything except RÀ crank shaft and flywheel. Remove piston rings CEN ‘so crankshaft turns freely and attach saw blade clamp to fourth piston as shown. Use old saw blades ground down, Mount engine on scrap iton stand and attach saw table and mo- tor, Make saw guide of 1%” steel plate. METAL TO BE _ SAWED POWER HACK SAW thet will give very satisfactory results uses an auto connecting rod, cut off as shown above, to drive hack saw. A large wooden pulley powered by a %4 H. P. electric motor operates connecting rod. Metal is held rigid by simple vise. 105

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CAPTIVE Model PLANES MANDALAY" AIRPLANE KITE MAE I LEAD DISC LEADING EDGE SPAR, a" Xx 3/6" BALSA WING STRUCTURE IS COVERED WITH RICE PAPER AND "DOPED" THE SAME AS WITH MODEL PLANES by DICK COLE OWN through the ages the common kite has played a very important part in the advancement of science. The early Chinese used kites in the construction of bridges, Franklin used the kite in his electrical ex- periments, and the kite was used, too, by the Wright brothers in their early. aviation ex- periments at Kitty Hawk. : Although kite flying has been one of the chief pastimes of youth throughout the world it takes on new form with kites being fashioned after modern aircraft The kite plane opens new fields to the model plane enthusiast who can now build ships that will soar for hours instead of merely jumping off the ground for a few seconds. The simplest of airplane kites is the “Man- dalay” which conforms closely to an ordinary model glider, except that the dihedral angle is somewhat greater. Then too the operator is able to control the rise and fall of the plane simple by pulling on the kite string. The string, which passes through an eyelet di- rectly under the center support of the wing and then along the fuselage through another eyelet attached to the elevators, permits their adjustment while plane is in flight. All three types of planes illustrated are con- structed along the same general lines. Cut the plane's fuselages from 3,” balsa wood and 106 WING IS SLIPPED INTO SLOT AND CEMENTED = LI m cu z2«x —— RIBS GRÁDUATE FROM NO. ! AT MIDDLE, TO ege NO.9 AT TIPS eae 3 = MM FUSELAGE, 3/32" BALSA 1/2" SQUARES NOTCHES ADJUST TENSION OF RUBBER, BAND LTELLLLLELETILLET TL / /eveleT TRAILING EDGE SPAR, 3/32" X y4" BALSA 1 T. ELEVATOR CEMENTED BALSA : BLOCKS REINFORCE =, LOA TS! DIHEDRAL~ FASTEN BLOCKS AND RIBS TO SPARS WITH AMBROID CEMENT _ 32" BALSA, TAPERING TO i Ie" AT TIPS WIRE LOOPS THRU FUSELAGE FORM EYELETS FOR KITE STRING BUILT-UP WING (SEE DETAIL) ^ idu THE 3" DIHEDRAL PRO- : VIDES LATERAL STABILITY : axo rud Both Mandalay and Sky Arrow kites are constructed according to the plans shown above except for slight physical changes. All planes use the same type of rubber band elevator control. build up the wing in the same manner as in regular model plane construction. Cover the wing structure with Japanese tissue and then apply the dope so as to draw the wing cover- ing tight. Cut the elevators from 4,” balsa to the size and shape shown. The angle of the elevator is governed by a rubber band which is at- tached to the fuselage. Several sizes of rubber bands should be tried in order to secure the correct tension. A 1” hole cut in the nose of the plane holds a small piece of lead used to balance the plane when in flight. In constructing the “Sky Arrow” the pro- cedure is practically the same as for the Modern Mechanix & Inventions

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Become FLYING KITES The kite plane opens a new field for the BI model airplane builder. These unusual ships will soar through the air for hours. “Mandalay”. In this model, though, the back sweep of the wings requires that the eyelets for kite string be located farther back. The “Flying Venetian Blind” is somewhat differ- ent so far as fuselage construction is con- cerned. Here two sheets of tẹ” balsa are veneered together then cut to shape with a Magazine, May, 1936 THE SAME FUNDA — F MON PREVAILS ON : STREAMLINE THINNER BALSA STRUTS - EBADING EDGE T J E s S z T eren eH AN ADIN FE DEENA. ELEVATION AE AN. P MANDALAY" TS anne aem BEER Aix FUSELAGE 1S BUILT Tee tas TO 3 BY VENEERING E : ^3 y? Res OE i5" NE TONG BALSA AT. ecd er ANGLES. U i : GLUE AND m (el IN GLAMPS 2 NIGHT EN 2 oz. LEAD / La : 221 Due to large wing surtace the Venetian Blind kite should have a strong rubber band in the elevator control. Success with this plane depends upon care exercised by builder. All planes.are flown in same manner as ordinary box or cloth tail kite. sharp knife. Four wings are constructed in the identical manner as those used in the other models except that their leading edges are slightly thin- ner. The rubber band on elevator is also heavier than ones used on the other kites. The plane kites are flown in the same man- ner as the conventional tail or box kites. Although a little more difficult to launch than the ordinary kites the planes are not at all difficult to keep in the air. 107

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Inlay Workshop Projects With Sawdust Paste con KE WATE Me T&A TRAY DESIGN. TION FOR EACH COLOR TO BE USED. SOAK A PILE IN EACH SOLUTION, RY AND RE-SIFT ROUT OUT ^-— DESIGN ER nT? H CARBON PAPER, Cur P DGES OF eens” QUTLINE INTO BOAI S wy MIX IN 1/6 PART OF CASEIN GLUE To EACH MILET SIP T-DAMPEN WITH RATER STAND 20 M FREED, SANDUST. ONE, COLOR | BUILD, UP. RIDGE ABOVE. DO NOT OVERLAP SIDES Inlaying with the paste inlay is simple provided the various stages in the process, as shown above, are carefully followed. Designs may be inlayed in tea trays, tables; in fact, anything. A Clothes Rack for Junior's Room HAT boy wouldn't be proud to own this novel cadet coat rack. With it occupy-. ing a corner of his room there would no longer be the usual pile of clothing strewn upon the floor. Any child will get a great deal of pleasure in hanging up his clothes and at the same time form a lifetime habit. The soldiers are cut from one-inch stock according to the builder's own ideas. If de- sired the soldier may be first drawn on paper then traced on the wood. A keyhole saw or power band saw may be used in cutting out the design. When this work has been completed attach a board across the bottom for the shoe rack and a curtain pole or a length of iron pipe, flanged at each end, for the clothing support. Complete the stand by painting the soldiers red, white and blue. Paint the shoes and clothing support black and the shoe rack white. 108 NTERESTING and beautiful inlay work can be done in the home shop without the use of inlay woods and at little or no expense. The only materials required for this unusual process is some fine sawdust, casein glue, and water color dyes. After deciding upon the article you wish to decorate select a suitable design and trace it upon the wood with carbon paper. Next, carve or route your design using chisels or wood carving tools, The grooves are cut to a depth of l&-inch with vertical, square edges. Care should be taken not to splinter the edges of the routed part. When the carving has been completed mix- ing of the inlaying paste is taken up. Care- fully sift a quantity of fine sawdust twice through a fine wire screen then make up weak solutions of water color paints or dies, in colors to match as nearly as possible natural wood colors. Soak amounts of the sawdust in each color, then: remove, spread out and allow to dry. When the sawdust has dried it is ready to be made into the inlaying paste. To each six parts of sawdust add one part of dry casein glue then sift through the screening 'so as to thoroughly mix the two together. Cold water is added to the mixture until it is in the form of a soft putty. Using a spatula or putty knife apply the paste pressing it firmly in the grooves. As the paste will shrink when dry be sure to fill grooves well. After all grooves have been filled lay a sheet of paper over the design followed by a smooth board. Clamp in vise for three days, remove and sand until design appears. CROSS POLE -PIPE, (PAINTED) -OR USE CURTAIN POLE} Iu SEEN No ee “ BOARDS - PAINT ON DESIGN This pair of Cadets stand guard over Junior's clothes while he is at play and make him want to hang up his togs when he comes in. The soldier clothes rack can be built in a few hours. Modern Mechanix & Inventions

Page 109

Old "Phonographs Make Useful Cure | 4 Eo lU Sube This attractive buffet can be constructed in a few hours from two old phonographs. An orthophonic victrola can be easily made into the Governor Winthrop type desk shown at right. HAT old phonograph which has been standing in a corner of the attic ever since the coming of radio can be converted into a practical piece of fur- niture at very little cost. When finished the article will equal in many instances, the manufactured product. If you have a phonograph of the ortho- phonic type it can be made into an attractive Governor Winthrop desk. Make your pat- terns after the styling used on the original then cut or have your local mill cut them from whatever wood you choose. Reverse the hinges on the phonograph’s lid, remove the motor and reproducer and mount the shelves to the top of the phonograph with four small right angle brackets. Complete the desk by finishing the shelves in same color as the rest of the desk. If desk is too high saw 142” from bottom of each leg. Replace the original knobs with drop handles. The attractive buffet shown above was made from scrap lumber and two phono- graphs purchased at a secondhand store at $1 each. The motors and reproducers were re- moved and the two cabinets jointed with draw rails fastened in place with dowel rods glued securely. The drawer slides are attached with wood screws as is the plywood back. Two large and two small drawers are required and may be made or taken from some old piece of furniture. Magazine, May, 1936 Phonographs, now worthless, make practical pieces of furni- ture at little or no expense.. BOOK OR WHAT -NOT SHELVÉS i SHELF AND PIGEON HOLE SPACE INSIDE HINGED SLANT TOP VICTROLA TOP OLD VICTROLA 109

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M akeT hese NOVELTIES with The attractive ink well and dresser box shown above wete turned from colored plastics. Form knobs by tapping short plastic rod into hole in block of wood and attach to the faceplate. The base of the inkstand as it appeáts near its completion and below, looking into front of nearly completed inkstand. Above—The walnut base of the ink stand mounted in the lathe. Below——the dresser box with the lead band inserted in the inlay groove. 110 by Dale R. VanHorn “Ny + LE T —3 DRESSER BOX Dimensions for the inkstand and dresser box are all indicated in the above schematic drawing. Carefully note method used to keep lead inlay strips from becoming loose from turnings. HE surprising adaptability of the new plastic materials and the striking results of the finished articles, makes them ideal for -the home craftsman’s turned projects. Hard rubber, the first plastic, was confined to one color. Bakelite, the next important plastic discovery, was hard and it did not lend itself readily to easy manipulation in the home shop, but this new plastic can be worked like wood or soft metals, turned in the lathe, bent to shape in hot water, planed, drilled, filed or sanded, and takes a beautiful polish. Besides, every color of the rainbow are available. . To get acquainted with it, simple projects naturally come first. A solid color bracelet requires only the obtaining of a short length of 215-inch tube of the right color. Turn a wood spindle with a slight taper so that the plastic cube can be forced to a snug fit upon it. Then with the proper chisels, round the Modern Mechanix & Inventions

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Rainbow-Hued PLASTICS Brilliant in color and as easy to work as wood, this new celluloid-like plastic ma- terial can be turned, cut or bent into at- tractive novelties. The projects described here are just a few of the many possible. SHEET PLASTIC SPACE FOR PAPER — [y = METAL — | | H r i i J i IZ DIAM.PLASTIC TUBE WOOD BASE inner edges, round the outside surface to the desired design, and polish. A variation con- sists of sanding four flat sides, evenly spaced and cementing strips of a contrasting color to these flat areas, using rubber bands to hold them in place until the cement has dried after which the ring is turned down on the lathe. Suggested color combinations are: yellow ring with green or black segments, green ring with yellow or black segments, black ring with yellow or orange segments. An attractive ink well which harmonizes almost anywhere can be made with a small block of walnut, a tube and a small piece of flat plastic. Turn the base to 3 inches in diameter of the design shown and sand, fill and finish with clear lacquer or shellac. Turn the center depression just large enough to take the plastic tube, to a depth of about $- inch. Felt should be glued to the base and the edges trimmed. Turn a wood spindle to make a tapered fit for the plastic tube, work it on to a tight fit, and true up the ends, with a length of 115 inches. The outside can be also trued with a chisel, then the polishing wax applied with a rag to give a lustre. The bottom can be any thin flat plastic. It is turned between two blocks of wood in Magazine, May, 1936 SPACE FOR ENVELOPES CUT FROM IVa" DIAM. ROD COMPLETE DESK SET RUBBER BANDS STRIPS OF PLASTIC Oi The desk set at left is not only attractive, but very easy to make. Simplest of all projects is the bracelet at right. Several layers of plastics provide designs that are as original as they are attractive in appearance. the lathe whose diameters are that of the inside diam- eter of the tube. One block is cen- tered with the tail stock, the other with the live center. To prevent the flat piece from working out of alignment, drive two short brads in the exact centers of the ad- joining ends of the spindle and file them to sharp, short points. The flat piece is then placed between them and the dead center worked up snug [Continued on page 122] Nails driven into a block of wood attached to the lathe’s faceplate will permit turning.

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Electric Magic Box for Amateur Magicians HIS novel electri- cally operated magic stunt will add life to any party and make you the center of attention. Ask a guest to place a coin in any one of the three holes in the “Black Chamber Box” while you turn your back. Although the lid is closed you can, without fail, tell them in which one of the holes the coin lies. . The box is made from cigar box wood and is 434" x2"x13$8" in size. Three holes are cut into the top of the box just large enough to take a 10-cent piece. In each of the end holes force a pair of contact pins, one pin in the center and the other against the edge of the hole. In the center hole place a single pin. This is merely added to avoid suspicion. To the back of the top attach a vestpocket flashlight battery wiring up the center pins to the tips of two flashlight bulbs. The brass base of the bulbs are attached to a length of heavy wire which in turn is soldered to the short brass clip on the battery. Connect an- ‘other heavy wire to the two pins remaining . and solder this wire to the long clip on the battery. Insert the unit in the box noting the location of the bulbs. In the side of the box opposite bulbs punch two small pin holes. Assemble the box, paint in mottled finish and trick is ready to perform. The secretis simple. When coin is placed in either of the end holes circuit - is completed and lamp goes on. The light showing through pinholes tells you at once in which hole the coin has been placed. If there ` is no light shining through either of the pin holes the coin is, of course, in the center slot. The contact pins are ordinary straight pins which are cut off after being pushed through the box. All connections should be well soldered to insure successful operation of the “Black Chamber Box.” After completing the device and getting it to operate satisfactorily check joints for possible light leaks as. they would give away the secret. The mottled finish on the box prevents the small pinholes from being detected by the per- son hiding the coin. The many ways in which this stunt can be performed are far too nu- merous to mention. 112 FLASHLIGHT BATTERY Wire the “Black Chamber Box" in the manner shown above. Use heavy wire for supporting flashlight bulbs and solder all connections well. Dattery is glued to back of wood panel. Celluloid Improves Carbon Copies > SHEETS OF PL TYBEWAITER PAPER .010' MAT-FINISHED CELLULOID, NEXT TO PLATEN A sheet of very thin mat finished sheet celluloid, insetted in the typewriter according to the above illustration, makes it possible to cut six or more clear carbon copies at one time. ERY often when a number of copies of ari article are desired carbon copies are made. Usually only the first two copies come out clear, the others being either blurred or very difficult to read. A simple way to correct this is to place a sheet of .01” mat finished celluloid on the bottom of the papers then in- sert in typewriter and type in usual manner. Modern Mechanix & Inventions

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IDEAS FOR HOME AND BUSINESS Razor Blades Aid In Tearing Paper ERCHANTS having trouble in tearing EA off wrapping paper from the roll, eT AN especially if it is heavy stock, will find this E t mem simple suggestion very practical. : - Drill three holes in the end of the present blade of your roll paper cutter spaced so that an ordinary safety rzzor blade may be fastened in place. The blade is attached to the paper cutter with either split rivets or flat head machine screws. It is important that the blade is rigid if it is to make quick clean tears. When a length of paper is desired simply unroll to desired length and give it a sharp pull.—Ralph Behm. RAZOR BLADE SET TO START DRILL HOLES IN CUTTER BLADE TO MATCH HOLES IN RAZOR BLADE 7 SPLIT RIVETS HOLD BLADE PENCIL POINT TWIRLED SS PIPE Sandboard Puts Sharp, Clean Point On Pencils Re RTISTS as well as the average person will find this S SAN CE simple pencil sharpener very convenient for keeping 2 pencil points unusually sharp. Attach a piece of fine sandpaper to a plywood handle and underneath attach a B 2 : m PIPE STEM coiled pipe cleaner using rubber cement to hold it in | CLEANER place. Sharpen pencils on sandpaper then twirl across FASTENED Tt pipe cleaner to remove lead dust.—Wm. Wagner. SQUARES FOR’. CELLOPHANE COINS CUT WITH RAZOR BLADE ; : A Practical Coin Album for the Hobby Fan OIN collectors will find this coin album the ideal thing for displaying their hobby as the various coins may be viewed through cellophane without the danger of be- BLACK PAPER ing lost. BACKING Cut sheets of cardboard just large enough to fit inside .SECURED TO — | i : CARDBOARD. ~~ the plywood box then cut out the coin recess squares with CEMENT a sharp razor blade or pen knife. On the bottom of the iam cardboard sheets attach black paper backing so as to ALBUM SX 7 27X11" show off the coins well. Insert the coins in the squares : - and over them cement a sheet of cellophane.— V. Horn. i et c t Ü 6 3/4*X10 Spring Coils Identify Drug Bottles OTTLES containing poisons or other dangerous solu- tions are very often accidently mistaken in the dark as being medicines and when taken internally lead to serious illness. This danger can be avoided by attaching springs over the necks of all bottles containing harmful liquids. Wind the spring with brass wire then slip over ihe neck of the bottle and draw the last two coils tight so that the spring cannot accidentally come off. It is impossible then to remove the contents from the bottle without first compressing the spring. This kink will also prevent small children from opening bottles which may contain harmful drugs.—Wm. Hertwig, Jr.: Magazine, May, 1936 113

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Electric Hammer Applies Attractive Designs To Metal TO BATTERY BRASS STRIP DOWEL BREAKS CONTACT Attractive designs traced upon sheet copper, lead or other soft metals can be formed into attractive hammered metal projects through the use of this easily made electro-hammer. "Dancing Ducks" Easily Made Toy HIS ingenious toy, a new idea from the Orient, can easily be constructed by the amateur or professional woodworker in less than one hour. When pushed along the side- walk the twin ducks whirl around, jingling their bells merrily. The carriage is a simple wooden axle 34- inch by 34-inch by 4 inches long to which is attached two wheels 114 inches in diameter. These are cut from round stock or sawed out of flat stock on jig saw. Nails driven into the ends of the carriage block serve as axles for the wheels. The heads and bodies of the ducks are carved or turned on a lathe to the shape in- dicated in the drawings. When finished the pedestals are cut in half forming the upper and lower parts of the bodies for the two birds. The one part of the body fits into the other and the whole assembly revolves on a nail driven into each end of the carriage. After the ducks have been completed attach an 18-inch length of 34-inch wooden dowel to the carriage so that the child can push it easily. The ducks are finished by painting canary yellow with blue and red striping on the wings and head. Two small costume bells complete the toy. 114 ITH this electric hammer you can make attractive hammered metal ash trays, coasters, and other useful articles in only a fraction of the time usually required to do the ‘work by hand. The tool, which is connected to either a six-volt battery or door bell trans- former, is constructed from a minimum amount of parts and simple enough for any- one to make. Secure a spool approximately 3 inches long and 2% inches wide and on it wind about 15 layers of No. 16 enameled wire until the coil is flush with the ends of the spool. The hole in the spool is just large enough to pass a !4- inch iron rod about 2% inches long. Drill holes in each end of the rod to take the ham- mer heads and a length of maple dowel. Mount the spool on a suitable block of wood with brass brackets. Next make the spring contact from a strip of brass according to the illustration so that it will normally be closed, but will be momentarily opened each time current passes through the coil. This action is caused by the solenoid coil drawing up the iron rod to which is attached the maple dowel rod. A spring of medium tension inserted be- tween the magnet and hammer head drives the tool against the work. — a i TUR N ON LATHE i ed CUT HERE == “FORTWO ^X^ à PEDESTALS r i HEADS TURNED ON LATHE THE DANCING DUCKLINGS These cute little ducks go round and round when pushed along the sidewalk. Though they require only a few minutes to make the odd birds will provide unlimited entertainment for tots.

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KODAK | VOLLENDA | a precision miniature 2 MODELS TO CHOOSE FROM ODAK VOLLENDA fits in the palm of your hand, pops open for instant use at the touch of a button... Precise— ityields needle- sharp negatives. Sixteen 1-3/16 x 1-9/16-inch pictures each loading. Available in two lens-and-shut- ter combinations. With 1/500- second Compur-Rapid shutter and f-3.5 lens—$44.50... with 1/100- second Pronto shutter and f.4.5 lens—$25. KODAK PANATOMIC FILM extremely fine-grained, fully color- sensitive. Especially designed for miniature camera use—an ideal film for Kodak s moss t Vollenda and KODAK MINIATURE ENLARGER other small cam- to supplement your tiny camera. Makes eras. Makes strik- big prints from little negatives. Cabinet ing enlargements base optional. Price for enlarger, paper possible with a holder, Anastigmat f.4.5 lens—$67.50. minimum of Paper cabinet base, $10 extra. grain. AT YOUR DEALER'S » SS T : FREE BOOKLET... Every picture maker should have this book—"How to | Make Good Pictures.” 4 Its 224 pages are packed you'll want this booklet for your photo library. It gives complete information about all Kodak miniature cameras and equipment. Write for your copy today . . . Eastman with useful photo knowl- F E | Kodak Company, Rochester, N. Y. edge. Tells new ways to | T use your camera... how to make trick pictures, Get your copy today. Name Address, Thank Vou for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 117

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A New York court clerk, doseph J. Kolassa, has 2 most unusual collection hobby — elephants, From every corner of the world Mr. Kolassa has gathered glass, iron, wood, ©- pottery and celluloid pachy- derms until his collection now numbers more than 500. In the living room more than 150 of the beasts decorate the Mantel while still more are found on the radio and on tables throughout the collec- tor’s home. pin is included in the collection in- cluding ones which he made himself, To all newlyweds Mr. Smith presents a shining new pin, Charles M. Strong of Adrian, Min- nesota possesses a number of an- cient religious books including a tiny volume of Bible stories measuring A Minnesota enthusiast has focussed his collecting urge on rolling pins. Every style of box magneto phones to the new al! bakelite dial instru- ments with self-contained bells. — Included in the odd collection are microphones as used by radio stations, air- planes and ships. Pieces of amher, known to geologists as fossilized rosin, form the interesting collection of Jerry Miller of Minneapo- lis. Many of his pieces con» tain prehistoric insects which were imbedded in the rosin while it was in a fluid state. Most of the insects are per» fectly preserved. one and one-half inches wide by two and one-quarter inches long. Collecting telephones is the interest- ing hobby of Arno Q. Wilkens, an electrician. In a building near Fleet- wood, Pa., Mr, Wilkens has assem- bled more than two hundred tele- phones ranging from the early wall- ADLETS FOR HOBBYISTS (See regular classified section for rates and other Information.) STAMPS THE FIRST Balloon Flight Stamp issued anywhere is the commemorative of Professor Picard’s famous Hight into Stratosphere in 1932. This beautiful stamp is getting scarcer every year. We will send it together with complete set (6 values) of Denmark’s beautiful Viking ships, com- plete set (5 values) General Judenitch Russia 1919, complete set (3 values) Victor Emanuel commemoratives of Italy, 1925, all for only 10c to approval applicants. Globus Stamp Company, 268-4th Ave., Dept. 150, New York, N. Y. TWO Fine Airmail ‘Triangles—Iceland triangle and new Bi-colored Mozambique triangle, and fine packet including Ubangi, Chad, Gabon, Inini, St. Pierre, Togo, Senegal, savages, ships, and animal stamps. Only 5c to approval applicants, Potomac Stamp Co., Dept. 905, Washington, D.C 50 DIFFERENT Stamps cataloging over $1.00 only a dime to approval applicants. 20,000 different stamps at prices ranging from lc. All stamps guaranteed genuine. A fine selection of U. S. revenues at lc 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. 905, Bethesda, Md. MAMMOTH Mystery Packet rare stamps only 10c to seri- ous approval applicants, also valuable free premiums with every selection afterwards., Our stamps are better, our service is different. Fair-Play Stamp Service, 1215 Browning Blvd., Los Angeles, Calif. BRITISII TURKISLANDS—Also Congo’s—Montecarlo— Nigercoast—U ganda—Djibouti— Ecnadorian— Ivorycoast - - Ubangi—Countries collectors need. Free for 5c postage. EMPIRE STAMP SHOP, Dept. MM., TORONTO, CANADA. SCARCE Brazilian and Paraguay Airmails!! Set Charkhari Pictorials! Also Big Packet including Congoland, Gabonese, Newzealand, Guinealand, Algerian, etc.—3c to approval ap- plicants. Hunziker, _Box 225F, Minneapolis, Minn. SCARCE Baden (Old German State), Exotic Mongolia. Turks Caicos, $5 U. S., Giant hi-colored Caymans, Im- perforate. DPark—free to approval applicants. Postage 3c. Viking Stamp Co., 1-M Hanson PL, Brooklyn, N. Y. a 105 DIFFERENT Stamps including large Spanish ship Cameroon, Gabon, Andorra, Azerbaijan, all for 10 cents to approval applicants. Swedell, 3129 Garfield Ave., Minneapo- lis, Minn. d 110 DIFFERENT Stamps from Kountcheou, Inini, Latakia. etc., and Free Premium Offers only 3c to Approval Appli- cants. Badger Stamp Company, Dept. M, Milwaukee, Wis. AIRMAIT,S—Brazil, Colombia, Ecuador, Mexico, Para- guay, all for 10c with double premium approvals. Progress Stamp Service, 235 S. Hope, Los Angeles, Calif. STAMPS! 100 diff. 3c; 500 dif. 35c; 1,000 diff. 90c! Illustrated Album (4000 spaces) 22c. Approvals sent. Tatham Stamn Co. (D9) Springfield. Mass. 50 DIFFERENT Stamps from 50 different countries—5c to new approval applicants. Brownie Stamp Shop, Dept. M, Flint, Mich. 118 SENSATION: _Airmails from 10 countries; U. S., South America; Pictorials 10c. A, Steele, Marlinton, W. Va. FREE!!! King George Memorial Packet, 15 varieties. Post- age 3c. Roberts, 901-T Fourth, Baycity, Michigan. UNITED STATES—Elaborate Pricelist free. 45 different l0c. 75 different 30c. Seidenberg, Baroda, Mich, STAMPS sent on approval. Quality at low prices. Herzberg, MM 197, Grantley, Elmhurst, I. FREE!! Civil War Stamp to approval applicants sending postage. Negus, Glendive, Montana. SURPRISE Packet.” Dime. Free Premium. 1308-F, The Dalles, Oregon. 250 MIXED Stamps 10c. With approvals. Woods Stampco, Box 437, Bedford, Penna. 1000 WORLD Mixture, good variety, 25c. 162, Newburgh, N. Y. Fred Dawson, Davis, Box COINS $5000.00 EACH for Rare Coins. We guarantee to pay the World's Highest Prices. Old Cents up to $2000.00 each, 1860 Cent $50.00. Cents of 1861, 1869, 1870, 1881, 1890 $20.00 each, 1859, 1866 to 1875, 1909 $10.00 each, 25c before 1916 $300.00, 50c before 1916 $750.00, Lincoln Cents before 1932 $35.00 per 100. Paper Money $26.00, Foreign Coins, Half Cents, Half Dimes and thousands of others up to $2500.00 each. Send Dime for Large Illustrated List before sending coins. Romanocoinshop, Dept. 560, Springħeld, Mass. COINS bought and sold. Commemorative half-dollars San Diago $1.40, Stone Mountain 95c, Pilgrim $2.00, California Jubilee $2.00, Monroe 95c. Illustrated Catalog giving values U. S. Coins 50c. Coin Shop, 2510 Chester Street, Alameda, California. $5.00 TO $500.00 EACH paid for Old Coins. Keep all oid 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, Maryland, Lincoln, Kentucky, Texas, Stone Mountain, $1.50 ea. Eighty-page Catalogue Coins & Stamps 10c. Norman Shultz, Salt Lake, Utah. E FREE: Foreign Coin, Banknote and Large Illustrated coin catalogue, for 4c postage. Approvals sent. Tatham Coinco, Springfield-9, Mass. OLD MONEY Wanted. $5.00 to $2,500.00 each paid for old coins. Buying catalog 10c. Robert Cohen, Bax 483, Muskogee, Okla. COINS, Beadwork, Indian Relics, Minerals, Books, Curios, gramps, Catalogue, 5c. Indian Museum, Northbranch, ansas. INDIAN CURIOS 15 ARROWHEADS, Scalpingknife. Gempoint, Scraper, Wampum $0.99, Peacepipes. Curios, Flintlocks. Photolist 10c. Paul Heikes, Rutland, Tllinois. 15 GOOD Indian Arrowheads 50c. Catalog 3c. Tomahawk head 50c, H. Daniel, Dardanelle, Arkansas, Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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FORD GASKETS ARE BUILT TO WITHSTAND HIGH PRESSURE — UNDER FIRE Tne development of the modern high- compression engine brought many new problems. Higher compression meant greater power and increased economy from smaller engines. But it also meant greater loads on various engine parts. Many parts which served their purpose well in ordinary engines could not stand the added strain. New materials and new methods of manufacture were needed to meet the more severe requirements, Forming the tongues in the steel core used in ] Ford V-8 gasket. Take gaskets, for example. Each ex- plosion in a Ford V-8 engine exerts pres- sure of about 600 pounds per square inch. That pressure must be held in by the cylinder-head gasket. And at the same time the gasket is exposed to the flame from burning gases with temperatures as high as 3000 degrees. To meet these conditions required the development of an improved cylinder- head gasket. It has a steel core between two asbestos sheets which are mechani- cally and permanently bonded to it. The asbestos is so treated that water, oil or gasoline will not affect it. A steel edging around combustion chamber openings adds These rolls bend the tongues over to hold asbestos to steel core, further strength and protection against blowing out. This type gasket is best for aluminum cylinder heads because it pres vents the electrolytic action which causes gasket corrosion. Regardless of where it serves or what it does, the most suitable and most eco- nomical part for a Ford is one which meets Ford requirements. When replacement parts are needed, insistence upon Genuine Ford Parts will help to maintain the high performance which was built into your Ford car or truck at the factory. FORD MOTOR COMPANY One of the punch presses in gasket de- partment at the Ford Rouge Plant. Partially completed Model A gasket show- ing how flange is curled over asbestos liner, Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 11¢

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Save Much Money On Auto Repairs With Smooth-On No. 1 you can make the following repairs easily, quickly and usually at almost no expense. Stops Leaks of water from a frozen, punctured or cor- roded radiator (nothing put inside), from a cracked engine jacket or from a loose hose connection of lubricant from a cracked crank, gear or differential case or bad joint; of gasoline from tank or line joint; of exhaust fumes from mani- fold, muffler or heater connections. Make Loose Parts Tight Smooth-On No. 1 makes solid connections—keeps lubricator terminals, grease cups, hub caps and nuts from backing or am dropping off; tightens loose fenders, lamp, tire and license plate carriers; makes screws stay tight in hinges, locks, robe and foot rails, window and dash moulding; tightens loose spring bush- ings to prevent wear and squeaking. À M bolt with Smooth-On No. 1 under head and nut washers makes a strong re- HW placement for a weakened rivet. Smooth-On No. 1 metallizes quickly, holds perfectly on any metal and is H proof against vibration and heat. Any- B one can get thoroughly satisfactory re- Write For sults by following the illustrated direc- FREE BOOK "°" in the free repair booklet.

| HoME «^ Auro REPAIRS

Send for booklet and get Smooth-On N No. 1 in 7-oz. or 1 or 5-Ib. can from any hardware store. it wiff; SMOOTITON SMOOTH-ON MFG. CO., Dept. 69, 574 Communipaw Ave., Jersey City, N. J. STOPS LEAKS <a Rh CEMENTS IRON fl

Please send the free Smooth-On Repair Book.

Normandie Docked With Tug Fleet [Continued from page 53] tine and we could see her following us at a distance. When we reached the pier the seven other tugs assigned to the job were already there, spread out fanwise in the middle of the river, The Normandie—now even larger by con- trast to the surrounding buildings—halted in midstream, at right angles to her 1,100-foot pier. The Alice M. and two other tugs moved in on her starboard bow, side to side, and three other tugs took up a similar position on the port bow. I heard several quick blasts from Captain Huseby's whistle and the six tugs, whose whistles had replied in kind, started pushing simultaneously, acting like a vice on the forepart of the ship. When she had straightened out, she began to move ponderously under her own power towards the dock. The Alice M. and the two companion tugs had to scurry around the side of her to avoid being run down. When we got near the stern, l noticed that two extra tugs had taken long hawsers aboard from the aft end of the giant vessel and were standing by, ready to pull her close to the dock when her full length was alongside. It all appeared so effortless, so routine, that I was not aware the job had been completed until I saw the passenger gangplanks being lowered. Linoleum — Industrial “Accident” [Continued from page 83] The materials are all carefully weighed and then poured upon a moving belt which carries them to the mixer below, then rolled upon burlap or cut to the design patterns and pressed upon the burlap base by hand. From the rollers, the linoleum passes di- rectly into huge ovens, fifty feet high, for the “long bake.” These are fitted with racks, from which the linoleum is hung in enor- mous folds. Each oven will accommodate more than a mile of linoleum. At constantly maintained temperatures, the linoleum is cured for a period varying from three to six weeks. Not until laboratory tests have proved it thoroughly cured is the oven allowed to cool. At another linoleum plant material to be used as the base for printed patterns is re- moved from the stoves before it has wholly matured, and the design printed on it. These designs are applied with wooden printing blocks which automatically take on a coat of varnish paint and then transfer it to the linoleum. In all stages in the manufacture of lino- leum, inspectors watch the material closely, and laboratory tests are made at many points. 120 Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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Pd ad PRINCIPLE T LAST! Automotive engineers have smashed down tha A barriers to perfected combustion! The new VACU} MATIC solves the secret of greater power! With almost tnagical action, this amazing. invention instantly puts new life and pep in any motor. it adds mileage to every gallon of gasoline . . . produces split-second pick-up, sensitive acceleratos response, quicker starting, greater speed and smoother running, Auizmatičz «Nothing Like Itt The self-starter — four wheel brakes == knee action — streame lining .: . and now VACU-MATIC! The sensational money- Saving invention! With i, engineers have achieved a pracucal means of cing air and gasoline automatically for all speeds, Guaranteed Gas Savings VACU-MATIC proves itself on every car., Ic is guaranteed to give worthwhile gas savings, quicker pick-up, and’ more —— VACU-MATIC is entirely different? It operates on the supercharge power of ic costs you nothing. You can inscantly tell che iape by automatically M ing * carne of exua m drawn E : : 2 rom the ouret air, into the heart of the pas mixture. It is entirely e A o usb ack and pet performance JOS — AUTOMATIC and allows the motor to “breathe” at the correct time, quickly notice the cash savings on gasoline. opening and closing automatically as required. No idling troubles—e Fits C fo carburetor adjustments necessary.. Jt is so simple it will amaze you —s0 practical it will save you many dollars on gas costs, VACU-MATIC is constricted of six pares, assembled and fused imo one unit, correctly adjusted and sealed at the r —-— — — FREE OFFER COUPON — — — — 1 i factory. Nothing to regulate, Any motorist can attach 'ACU-MATIC in ten minutes, Once in, its only reminder THF VACU-MATIC COMPANY 2617-190 W, Sare St, Wauwatosa, Wig is the surge of instant power and speed Genilcmen: Please send me full particulars concerning the VACU2 it gives to the motor and the savings it affords your pocketbook, E n f MATIC and details of yous Free Ofer This of course docs aot obligate me in any Ways VACU-MATIC offers a Free Details splendid opporuniy fot | You owe it to yourself to know all Una sales and prof F abour this remarkable discovery. Mail Nant ee pe deeeeress tories now being the coupon below. Stare saving gas assigned, Check with VACU-MATIC and enjoy a ncw DP RE and mail driving thrill! There's no obligation - coupon, so get the facts now! Write today! City. ones nee mow oy oe ainius State ves s = The VACU-MATIC Co. Wauwatosa, Wis. Lo = D. n medi ir propaion O NEW!! MIDGET POCKET RADIO $299 sonmus | [REZZO 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 part! Separates and re- celves broadcast stations with beautiful clear tone. z Range up to 50 miles— MUCH GREATER under good conditions—very little static or interfer- ence! Can be used by ANYONE ANYWHERE! NO CRYSTALS TO AD- JUST! Absolutely complete with midget phone and instructions to use while in bed, hotels, at home, autos, offices, camps, on bicycles or any place you may be. No complicated or messy hookups—takes only a Second to connect! THOUSANDS OF SATISFIED OWNERS. THESE ARE FACTS. Send only $1.00 and pay postman $1.09 plus postage on arrival or send $2.99 (Cash. Money Order, Check). deal Gift. Guar- anteed. State Color. ONDER NOW! (Foreign orders 65c extra.) TINYTONE RADIO CO., Dept. M-5, KEARNEY, NEBRASKA io eoe m ao a oe a H BOYS GIRLS $ /; GREAT SPORT : is A THROW y xa oi # with CLAXOPHONE ton under the table, hack of a door, into a trunk, desk in School, any old place. Big FUN fooling Peddlers, Policemen, Friends. Claxophone lays on your tongue unseen, always ready to use by anyone. Imt. Birds, etc. Claxophone with full instrue- tions, a set of Secret Writing Tricks, also Magle Dial e Trick. all for 10c., 3 for 25c. (mo stamps). CLAXO TRICK CO., Dept.87 New Haven, Conn. From practically every country in the world come thousands of letters of appreciation for '"AUTOPOWET,'' the remarkable book which has solved their electrical problem AUTOPOWER can also tell you how to turn scrap into money. It shows you how easily auto generators are converted into a. €. and d. c. generators and motors with voltage from 2 to 1000 volts, for POWER, LIGHT, WELDING, RADIO, SOUND SYSTEM; and, in fact, for whatever practical application you desire. A SPECIAL FEATURE: A 14 H, P., 110-VOLT, A. C. MOTOR FOR CONSTANT DUTY No previous experience or special tools are needed. You, too, can cash in on this knowledge the same as thousands of others have done. This book is so Plainly written that all you have to do is to follow the simple instructions. Many of the changes can be made for as little as $1.00. The generators can be driven by wind, water, the fan belt of an auto, or by any prime mover. Special instructions for direct propeller driven generators. $500.00 IN PRIZES given to the readers of “AUTOPOWER.” Full particulars with each book, Send for this book today while the price is still only $1.00 postpaid. 1 AUTOPOWER, INC. — Dept. A — 412 S. Hoyne Ave. — Chicago, ITI. $500.00 IN PRIZES Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 121

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COMPLETE PLANS FOR’A PERMANENT PROFITABLE BUSINESS OF YOUR OWN Bo P Our free plans show you how to build a successful business of your own sharpening Jawnmowers. No experience necessary. Most men average from $30 to $40 a week. J. B. Van Dien, writes: ‘Some weeks I earned $40 a week with my Ideal just as a side line.” H. Greenlau, writes; "Jn May I sharpened over 200 mowers at $1.00 ench.” Niles C. Race, writes; I have sharpened 785 mowers at $1.00 each.” THE IDEAL LAWN MOWER SHARPENER Makes old, dull lawnmowers cut like new. ‘Mowers run easier, stay sharp longer—eus- tomers come back year after year. Start right at home. Altach ihe Ideal to your lamp socket. Sharpens any make of mower in 15 to 20 minutes—you get $1.00 to $1.50. Attachments for grinding skates, grass shears, hedge shears, sickles, scythes, axes, etc. Send Post Card for FREE CATALOG and complete plans THE FATE-ROOT-HEATH CO. 336 Bell St. Plymouth, Ohio CHEMISTRY Complete, practical home-study courses prepared by, some of the ‘best-known chemists in this country, including ALLEN Roorms, B.S, M.S., Th.D.—Head of Department of In- dustrial Chemistry, Pratt Institute; L. M. Torman, Ph.D.—Formerly Chief Chemist, Wilson & Co, Now Vice - president, United ess Chemical and Organic : Products Co.; BRADLEY P| STOUGHTON, .— Head of the Depart- ! ment. of Metallurgy Lehigh University, an Owen L. SHINN, Ph.D. —Professor of Applied Chemistry, University of Pennsylvania. Mail Coupon for Free Booklet INTERNATIONAL SCHO OF CHEMISTRY Associated with the International Correspondence Schools Box 2325-G, Seranton, Penna. Without cost or obligation, please send me full details of your home-study course in £] Analytleal Chemistry D Industrial Chemistry O Chemical Engineering T1 Short Chemistry Course Pharmacy Name ...... daté sssiauxesbUc Uses Reset been Ve Re ei EP PER ss Address 122 Hollywood Stars Turn To Hobbies [Continued from page 51] paraphernalia for an endless camping trip, including stove, adjustable bed, sink, cup- boards, utensils, electric lights and storing Space. His plans for this trailer were pub- lished in MopeRN MrecHaNIX and are now available in blueprint form. In line with this type of building hobby, cabinet-making has slipped to the fore as one of the most fascinating of pastimes to Hollywood people. Arthur Hohl, star of thrillers like Superspeed and Eight Bells, re- cently discovered what. could be done with a little lumber and some tools—and since then has furnished an entire house with the products of his own plane and saw. Planes, model and genuine, hold a peculiar fascination for people of the screen. Itis here that Ruth Chatterton, one of the few me- chanically-minded actresses, shines brightly. Paul Lukas, capitalizing on the experience he gained in the war, has a Spearman open- air bi-plane and is his own mechanic. The spell of this tinkering habit has swept so completely over the film city that even minor studio attaches have been reached. Sound-technicians meddle with cameras, and cameramen go in for wireless stations, talking -with China and Australia nightly. Make These Novelties With Plastics [Continued from page 111] with the lathe going. The points embed themselves in each side of the plastic and it can be turned to fit. The top is turned in the same manner to the right size. It, however, has a shoulder cut on the under side to keep it from sliding off. A hole is bored half way through the top for the knob which is made by boring a slightly tapered hole in a small wood block on the face plate, driving a short section of plastic rod to a tight fit, and turning this to the shape and size of the knob shown. A further adaptation of the method used in making the ink well, is shown in the dresser box. Starting with a tube of larger diameter, in this case 3% inches, the truing of the ends and turning of the bottom, top and knob are virtually the same as with the ink well. With the tube on the wood spindle, the groove for the inlay was made. A file tang was sharpened to a narrow, flat edge and this used to cut under each edge of the cut. This step is important for the lead later is tapped, flattened and thus locked in place, never to work loose or come out. Cut one end of the strip square, lay it in the groove in the plastic and with a very light hammer, tap it repeatedly to lock it. Care [Continued on page 144] Thank You for Mentioning Modern Mechanix and Inventions M agazine When Writing to Advertisers

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9 Why trust to luck when you buy razor blades! At 4 for 10c, Probak Jr. isa double-edge blade of known quality. This blade whisks through the densest beard—glides over tender spots without pull or irritation. Buy a package today. PROBAK JUNIOR Make Glazed Concrete Products Beautiful, colored, glass-like, waterproof glaze for Pot- tery, Tiles, Blocks, Walls, Novelties. Exclusive process. No skill or experience needed. Complete pottery plants using no molds, power or costly tools and making 2,500 different designs of vases, birdbaths, jars, etc., cost less than one mold by old methods. Use only sand and cement. Patent protection given operators, New, money- making business for men. Send 10c TODAY for book, color plates and complete infor- mation. NATIONAL POTTERIES COMPANY, 424 Second Ave. So., Room 26 Minneapolis, ANY DAY—next month—next week—a bet- ter position may be open for you. Learn how to “sell yourself” —to express your ideas in type. Easy—if you owna New Royal Portable! TOUCH CONTROL ... that’s the answer! Royal's sensational exclusive improvement en- ables 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 handsorne carrying case; also amazing new system of speed typing quiekly learned in spare time. Coupon brings complete information. Fill out—mail today! KEY Sess TO A SUCCESSFUL FUTURE! LOOK INTO THE FUTURE! Do you want to be a SUCCESS? Ambitious men are turn» ing to DIESELS — America’s fastest-growing industry. Start NOW to learn DIESELS at HEMPHILL DIESEL Schools, Day and Night Residential Courses and Home - Study Course E with later Shop Training. Mail Coupon Below! a HEMPHILL DIESEL SCHOOL a NEW YORK CHICAGO LOS ANGELES P 31-29 Queens Blvd. 2013 Larrabee St. 2123 San Fernando Rd. : t. MM-536 Long Island City SEATTLE MEMPHIS iter Company, Inc., Dept- DETROIT 509 Westlake No. 423 West Monroe Ave. Royal Typem e New York City. , ecial pur- 2344W. LafayetteBlvd. (Also schools at 1361 Granville St,, Vancouver, B. C.) 2 Park Ave me details concerning ne CAUTION: Hemphill Diesel Schools are operated ONLY in cities listed above. Please Ed on the New Royal Portable. "TES MAIL COUPON TODAY C rQuote tradein allori ne P eene i Typewriter, Serial number .. +». oe . Hemphill Diesel Schools, Dept. MM: Please send, me without obligation, MB... mtm eere tt i fulldetails and copy of '*Diesel News'' with amazing facts and pictures. NA Y Qa ACER AR C REOR EUN "T ae pud oe ett STATES ees TY... n Address ic ; EM E City. State, aa Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 122 *

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iM S for examination BIG VOLUMES ! Don't send us a cent —just your name and address and we ship all of these books to you for ten days free examination. Look them over carefully, sce how easy lt is to find out the things you want to know, and then decide whether or not you want to keep them. The price and terms are so low that everyone should have them on hand for ready reference, Billions of dollars are being used to make Jobs and the Home Modernization Program offers the 2 bigrest chance to male money carpenters have ever known. Are YOU Ready? Can you remodel from start to flnish—do you know the tricks of estimating, laying out, etc.? Here’s your chance to get ihese faets—qulckly—easily, without study or work—just put your finger on what you want to know Instantly. Carpenters, Architects, Contractors, Home A gold mine of facts can often be converted into a gold Builders mine of dollars, for bullders save money and learn how to make more money with the five big books on architecture, carpentry and building. Carpenters make themselves contractors by learning how to estimate correctly; contractors gre able to handle bigger and more profitable Jobs hy learning how the big fellows do it. Men who want to bulld homes can save money by learning how it should be done. The new Jiffy Index puts before your eves without wasted time, the things you want to know. Nothing overlooked. Use of tools, building construc- tion, heating, lighting, plumbing, architectural drawing: all covered. These Drawing Instruments (59°) Included $ 3 3 Complete set of drawing instruments if you send for these building books NOW. These Instruments are made of the finest German sliver, are absolutely accurate and are packed in velvet lined leatherette pocket case. Real $10 value, but free to you with these hooks, Do American Technica! Society, T Drexel Ave. at 5Bth St., Dept. G-5320, Chicago, IIl, I would like to look nt the Ave hooks described above. Send them on your free offer. I will pay the few cents delivery charges only and will examine them thoroughly and return them in ten days unless I like them, |n which case I will send you $2.00 and after that $3.00 per month until the total price of only $19.80 is pald. You are also to send me the drafting instruments and consulting membership certificate of the American Technical Society, without extra charge. Name ———————— Address Please attach letter stating age, employer's name and address and that of nt least one business man as a reference. AMERICA’S MOST POPULAR OUTBOARD * 1936 model an even greater value than before. The Sports- 1nan attaches instantly to any boat; drives rowboats, canoes, skiffs, fishing boats up to 7 m.p.h, Runs 3 hours on gallon of fuel. Sosimple to operate thata child can easily start and run it. Note the handy light weight—only 24V, Ibs. Extremely quiet — under- water silenced. Write today for new catalog describing Sportsman and 7 other Evinrude models, including the new Hooded Power SPORT- WIN, only $77. Address EVINRUDE, 4717 N. 27th Street Milwaukee, Wis. SEND FOR FREE CATALOG Amateurs Capture Action [Continued from page 69] lutely necessary —if, for example, you are fol- lowing a moving object. Always shoot mov- ing objects at a 45-degree angle, coming into the camera or going away. Remember that hundreds of good newsreel shots have been turned down by editors because of too much panoraming, and unsteady pictures. One to Fifty Dollars a Foot Another and more fertile field now is open- ing to the amateur who can do work of pro- fessional quality. Twenty-six hundred free- lance cameramen, scattered over the world, today are producing pictorial and travel shots for feature pictures. Usually they are equipped with professional camera and sound-recording devices. Their films, when accepted, bring from one to fifty dollars a foot. They are not “spot news,” but pictures that may be used in framing other produc- tions—atmosphere shots, backgrounds, and mob scenes, to be used in connection with studio-made action. In their libraries, large Hollywood studios have thousands of feet of such material, collected over a period of years for use in feature productions. One camera- man alone has shot 3,000 stills and 150,000 feet of film. Many amateurs are traveling the globe, bringing home pictures of extreme interest. Some make prints, editing, cutting, and titling them, to distribute among friends. Others have sold them to industrial companies or for visual education purposes, thus making their hobby pay its way. Many Gadgets Aid Filming The advanced amateur who strives for pro- fessional effects, needs to carry a rather bulky kit of auxiliary lenses, filters, meters, and other equipment. One man has equipped his camera with so many accessories that it is virtually a walking laboratory. A home- made “air” viewfinder, built from a square brass tube painted black inside, gives clear, bright images of natural size. Through a tri- pod socket in its top, the camera can be turned upside down for reverse shots, while jointed tripod heads allow it to be tilted in any plane or rocked from side to side. A permanently-attached light meter gives cor- rect exposure at a glance, while a distance meter, fastened to the finder tube, permits rapid focusing.. Special microphotographic accessories now help record the latest news of medical science. Bacteria and molds inay be photographed under strong magnification; yeasts at work, tissues ravaged by disease, eggs being fer- tilized and growing, provide thrills. 124 Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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Here's the New One of the simplest and at the same time most complete Shapers Some of its important basic features are: 1. Extra Large Table permitting the handling of large work with ease; 2. Interchangeable Spindles for 15" hole cutters for various types of work; 3. Improved Com- pletely Adjustable Fence for all varieties of straight work; ever designed for the workshop. starting pin for curved work of all kinds; 4. Complete Guarding system; 5. High Speed of 10,000 R.P.M. which with standard 3-lip Delta cutter gives over 30,000 cuts a minute, thus insuring smooth and finished work: 6. Complete range of cabinet and sash cutters for all types of mill work. For full details and description of this unusual tool together with illustrations of large variety of work that can be done with it, send coupon for the new 1936 Delta Catalog. Write for CATALOG It is crowded with photographs and information about the new line of 1936 Delta tools. Yt contains much valuable information that every man interested in motor-driven tools should have. It shows how Delta tools are built to stand the grind of production work, and yet are so low priced as to be within the reach of all, how they save time, money and labor—and quickly pay for themselves, Mail coupon without delay. nelose only 10 cents at same time for Book No. 2 of Practical Delta Proiccts, 82 pages of new and novel things to make, will numerous blue prints, working drawings, photographs and illustra- tions—and complete directions, DELTA MANUFACTURING CO. 600-634 E. Vienna Ave. (Dept. M536) Milwaukee, Wis, "Delta" EE ad and The Delta line in- cludes Circular Saws, Jointers, Lathes, Scroll Saws, Band Saws, Routers, Shapers, Grinders and a complete assortment of attachments and acces- sories, Write for latest Delta catalog and hame of your nearest elta dealer today. DELTA MFG. CO. Dent. M536 If 600-634 E. Vienna Ave, Milwaukee, Wis, I enclose 10¢ (stamps or coin), for which please send me one copy of Book No. 2 “Practical Delta Projects.” Also place me on your mailing list to receive 1936 Delta catalog of quality motor-driven wood-working tools. Address City. D] Check bere if you are a Delta user now. en UE NER NEN DES GER ODER se ee eee eee eee ME UR EUN EET DNUS GUN NN CNN DNE u 2 B D JAMISON'S FISHING BOOK Limited Time Only Beautifully illustrated 32-pago fishing book, Shows prize winning bait casting, fly rod lures; amazing, new lure- adjustment reel and other modern developments for fisher- men by makers.of famed weedless Shannon Twin Spinners, Post ecard brings this valuable fishing book—FREE. THE W. 1. JAMISON CO., 741 S. California Ave., Chicago YOUR PASSPORT TO FISHING PARADISE n Full Size Professional Ty pA Amazing Machine, with Efficiency of Arc Welders Selling for $145.00 and More Offered at Breath- Taking Low Price. Only Boats With Full Length Spray Rails Keep passengers perfectly dry—even at high speeds. Catalog also shows today's five most popular models of sailboats. Two big facto- ries. Prompt shipment. - CATALOG FREE | of i s errs or on you are interested. Very tast utllity model ^ THOMPSON BROS. BOAT MFG. CO. 230 Ann St. ( Write to 130 Elm St., -PESHTIGO, Wis. either place Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers (79) CORTLAND, N. Y- Now You Can Own Complete, Full Size P ELECTRIC ARC WELDER For Personal or Shop Use—or Go Into Welding Business for Yourself! Here's thrilling news! A full size, heavy duty Aladdin Electric ARC WELDER—only $29.50! Not a toy, but a big, 150-pound man-sized machine that does all types of welding, uses all kinds of rods, welds all metals and alloys with equal efficiency, everything from heavy motor blocks to fenders. A sturdy, welded-stecl-construc- tion machine, yet easily portable on casters. j Works from 119-Volt Socket—S ur 1 I5" Coi AG tartent, Eco nomical—costs only a few pennies an hour to use. Often pays for It- self on first or second job. Comes complete with goggles, welding rod, tongs, etc. Nothing else, to buy (Flux for soldering and carbon for brazing also supplle Has sa ety fuse. Crystalline Finish cab- inet. Simple, complete instructions for doing all kinds welding Joba included. i Write today for fas- Amazing Details FREE! Sft facts about this new Aladdin ARC WELDER at $29.50! At last Inventors, machine shops, Garages: factories, etc., can obtain a highly efficlent machine GUARANTEED IN EVERY WAY, at a mere fraction of the price asked for others—at a saving thet may amount to several hundred dollars! Send today for full details. You are not obligated, COMMONWEALTH MFG. CORP. 3707 Madison Rd. Dept. D-10 Cincinnatl, Ohlo Send no money! 125

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Send for the new Spring & Summer 1936 ALLIED Radio Catalog. 136 pages packed with every latest radio invention and improvement—the leading Radio Supply Guide—a real encyclopedia of Radio Progress. More than 20,000 quality radio items at lowest wholesale prices, New Metal Tube Teleye : Radios—Battery, 32 Volt, new 6 Volt and Auto Radios; dozens of new Set-Builders Kits; everything in Short Wave Amateur Re- ceiving and Transmitting Equipment; new Public Address Ampli- fiers and Systems; also thousands of exact duplicate and replace- ment parts, radio books, tools and latest test equipment, Every- thing you need in radio is in this FREE Calalog. Send for it now! Build “Modern Mechanix” Radio Circuits Write to us for FREE Parts Lists covering such popular elr- cuits as the Hitch-Hikers 2 Tube Portable Radio; 2 Tube All- Wave All-Electric Set; 6 Tube Auto Radio; 5 Meter Transceiver; | Tube S. W. Converter; Cakepan Transmitter; 4 Tube R. F. Oscillator; Table Lamp Radio, Vest Pocket Receiver, and many others, We are Radio Parts Headquar- ters and can supply you with matched approved parts for bullding any ‘‘Mod- ern Mechanix” radio circuit described in this or any other issue. Before you buy, write for our parts lists. You wiil do your best work and achieve the most successful results with ALLIED parts, Send your order to ALLIED and save tlme, money and effort. SEND FOR YOUR FREE COPY AlliedY Radio CORPORATION -> 833 W. JACKSON BLVD.,CHICAGO, ILL. Kit of the Month NEW 2-IN-1 AMPLI- FIER. Described in MODERN MECHANIK for May. Boosts power of home-made short wave sets. Very inex- pensive; easy to build. Send for our FREE Parts List. D] Send me your J'REE 1936 Radio Catalog. R a O Send me Parts List fOr wevcccscsvcccvccsccvescseceess i i Name ssserae enueacepososos eossetheotoseasessoseee eene I E a City eraa TO danse Wiehe Used ein rin State... 126 Packing Thrills In a T. T. Track [Continued from page 87] of the more gentle parts of the track, shifts into higher gears can be made. The track is so designed that various routes can be taken for these spins, to provide prac- tice in negotiating sharp curves, climbing steep hills, making leaps and doing other tricks. An approved T. T. course is as irregular as its designers can make it, and includes both right and left hand turns, and, if possible, a hill that will necessitate gear changing. All starts are made with dead motors. The starting positions of contestants are deter- mined either by qualifying trials or by draw- ing, whichever the promoter of the race speci- fies. The approved AMA system of flagging is used for controlling the race. Although a typical Tourist Trophy race seems, especially to the spectator who is not familiar with motorcycle pranks and feats, to be an extremely risky, rough-and-tumble affair, there are some hazards that are barred. For instance, although the course can include such obstacles as ploughed ground, hairpin turns and steep hills, there must be no streams, ponds or other water hazards to negotiate. The presence of a mud bog or water splash would make the event, in the eyes of motorcycle race authorities, a Cross Country instead of a Tourist Trophy contest. Super-Safe Plane To Span Ocean [Continued from page 73] ing the 500 miles per hour mark. It is reason- ably certain that the time is not far off when purely commercial planes will be equaling if not actually surpassing this figure. That speeds like this will be attained with the con- ventional plane of today with it’s numerous power plants strung like beads along the large-spanned wings is dubious. What is more likely and probable is the gradual improvement of wing sections (which is constantly in process) attaining a point ' whereby it will be possible to dispense with a great deal of the area now essential to safe flight. Then; what today forms the predom- inant portion of a plane may well become a mere rudimentary member with, possibly, extensible surfaces for landing and other maneuvers which involve reduced speed. As a matter of plain fact the whole tendency of wing design today is directed towards this goal as pictured on the cover. To bring New York within five hours of London would mean a facility almost beyond our imagination. Other complications, such as the continual threat in times of war to coun- tries erstwhile virtually isolated, would at- tain fantastic proportions. Thank You for Mentioning Modern Mechanix and Inventions M agasine When Writing to Advertisers

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Wells Photographs Into Future [Continued from page 38] They grow without soil or sunlight, for the elements of growth are chemically provided, and the constant artificial light is much more life-giving than sunshine. At the Boyce-Thompson Institution Dr. John Arthur has been growing plants in a solution of minerals and salts which take the place of soil, Although no sunlight reaches the room, the plants grow from four to five times normal rate in the rays of a sodium vapor lamp. Space Gun Is Greatest Marvel But a far greater marvel than any of those mentioned has excited the citizens of Every- town. It is a gigantic Space Gun—a monstrous, shell-nosed tower 1,500 feet high, half again taller than the Empire State Building. Like an incredibly huge cannon, it shoots projec- tiles entirely around the moon, and they come to rest in the Pacific Ocean! It operates on the rocket principle, electri- cally discharging successive missiles. In this connection. we can point to the work of Dr. R. H. Goddard, leading authority on rockets. At his laboratory at.Roswell, N. Mex., he has þuilt a 12-foot rocket which attains a height of a mile and a half, and Dr. Goddard esti- mates that a height of 50 miles could be at- tained. As the scientists of Everytown prepare for their great experiment, the rocketing of human passengers around the moon, opposi- tion develops in the form of Theotocopolous, a fanatical poet with a large following, who believes that science has gone far enough. By means of television, Theotocopolous in- cites the populace to stop the flight, but be- cause streamcar transportation has been tied up in anticipation of trouble, the enraged citizenry is compelled to march on foot to destroy the rocket tower. Catherine Cabal and Maurice Passworthy, together with their parents, arrive at the tower by plane and rush to the thousand-foot elevator which lifts them to the entrance level of the space cylinder. Far below them, like tiny ants, Theotocopolous and his horde ad- vance brandishing weapons to smash the electric cables. Maurice and Catherine enter the cylinder. We see in it a hint of the mechanisms with which man may some day conquer space. Elastic straps with spring supports hold the bodies of the passengers and cushion them against the initial shock of the rocket dis- charge. A vault-like round door seals them against the bitter absolute zero of outer space. A periscope projects from the nose of the rocket car, enabling the passengers to watch the pageantry of the stars. Concentrated [Continued on page 132] If you like to draw, test your sense of design, color, proportion, etc., with our simple Art Ability Test.. An opportunity to get a frank opin- ion, free, as to whether your talent is worth developing. Magazines, newspapers, publishers and advertisers spend millions yearly for illustrations. Design and color influence the, sale of most things we buy. Artists have become important to industry. Machines can not dis. place them. If you have talent, train it. Drawing may be your surest road to success. The Federal Schools, affiliated with a large art, engraving and printing institution, has trained many young men and women now serving in- dustry as designers or illustrators, capable of earning from $1,000 to $5,000 yearly. Its Home Study courses in Commercial Art, Illus- trating and Cartooning, contain exclusive illustrated lessons by many famous artists. Practical instruction by experienced men is the reason for its many years' outstanding success. Courses sold on easy payments. Send today for Art Test and Free Book explaining present opportun- ities in art. Just fill out and mail coupon below. FEDERAL SCHOOLS, Inc. 5066 Federal Schools Bldg. Minneapolis, Minn. Send me, without obligation, your Art Test and Free Book. Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 127

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ET more sport out of pest shooting with your .22 rifle! Shoot Western SUPER-X cartridges! Their greater POWER, SPEED and LONGER RANGE are a revelation! Stalking is easier. Close approach unnecessary, You get more shots! For better scores in target shooting “shoot SUPER-MATCH Smokeless L. R. .22's! Mail the Coupon for complete in- formation, with interesting technical de- tails of Western’s newest ammunition developments! MAIL COUPON TODAY! Dept. E105; East Alton, Il | l . Send complete information on SUPER-X l and the entire line of World's Champion Ammunition, l Western Cartridge Company, l 128 BUILD AN AUTO RADIO Send 50c for blueprints to Modern Mechanix Publishing Co. Fawcett Building, Greenwich, Conn. AL, ROAD MAPS for your motor trip! Also Illustrated Travel Books and Hotel & Camp Directories! Just write us, telling where and when you want to go. We: will send you complete travel service for trip any- where in North America—free of charge and postpaid. No obligation. Service includes elaborate road maps of all States you visit, with your best route and latest road conditions marked. Hotel and camp directories, with locatión and rates. Illustrated booklets on scenic and historic sights. Conoco Passport, with identification card and expense record. Fishing and sport information sent if requested A service of Continental Oil Com- pany. Write now to— CONOCO TRAVEL BUREAU DEPT. 3 DENVER, COLORADO “Chinook” a Midget Gas Engine [Continued from page 104] silver solder or braze the two together. The cylinder head is a hard aluminum turning, made from old piston stock threaded with a 72-thread to conform to the cylinder with small holes provided so that a spanner wrench may be used to screw it in place. The crankshaft is easily made by turning from a piece of cold rolled steel. The connecting rod is made of solid dural shaped by filing. The piston is a solid piece of cast iron,’ turned and bored internally to the section shown. The port is cut out with a file as is baffle plate. The wrist pin is a piece of 3,” drill rod pressed in. To lap cylinder cut four slots in a brass tube as shown in drawing. This is fitted over a tapered shaft chucked in the lathe. Use water soluble valve grinding compound for lapping, holding the cylinder with a rag, be- cause the metal gets hot. Run the lathe, working the cylinder back and forth on the slotted tube until the ridges made by the cut- ting tool are removed. Then polish with the fine compound until the cylinder walls are like glass. When lapping is finished, the piston should fit very snugly. [Continued on page 144] Fly Rod Fishing for Bass [Continued from page 75] useful on flowing water than in still water. In the set-backs and in placid water along a stream or lake the bass bug is in its element. The most effective way of using a bug of the sort is to cast it lightly up on the over-hanging grasses along a stream and then as gently pull it off to drop in the water. An ideal fly rod for such bass fishing is the seamless tubular steel rod. It combines ex- ceeding strength with a smoothness of action that is comparable to that of bamboo. The fly line used for bass should be rather heavy to meet up with the demands of a rod having much backbone. The size C or Disa recommendation, soft and flexible rather than harsh and stiff. A six foot leader, level- calibered, is sufficient. When fishing bass in crystal clear water and using small flies, a tapered leader is a suggestion. The same bait casting rod, reel and line as used in taking the large mouth bass prove effective on the small mouth variety. Again it may be stated that a seamless tubular bait rod will prove most satisfactory. It should be 5 to 515 feet in length. A level-winding reelisasuggestion. A twelve or fifteen pound test line is best for light lures while an eighteen pound test hard-braided line is best for somewhat heavier lures. Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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News for Fishermen! Remarkable in- vention “‘action- izes” steel fishing rods—action at- tained only by new and exclusive FOLDER Gephart Process B of "Actionizing."' Also new streamline Vacuum Fit Forward Grip Be one of the first to enjoy Acltionized, Vacuum Fit Gep-Tods. Styles for Bait Casting, Fly Casting, Salt Water. See your dealer at once. Send for free folder, GEPHART MFG. CO., 220 W. Illinois St., Chicago Specialists In Steel Fishing Rods Air-. @ Bendix, world-fa- = Cooled mous in the aircraft & í ; and motor car indus- E Weighs tries, has created two only Profits ASSEMBLE YOUR brand new outboard motors! i| e E Bike Airplane engineering! Light- OWN KAYAK ---/75 EASY est weight outboards in the No espertence world! Streamlined! Fully à LBS required. 16 new models, e enclosed! Simple! Air-cooled à n SEND 10e light, non-sinkable. Best ma- gasoline modelis all aluminum : : Postage for terials. Complete cut to fit as- alloy except shafts and gears - assembling sembling kits. Money Back —genuine Stromberg carbu- K i 50 P Satalog ^ Guaranteed if not satisfled, Ask tor—quick starti h : p for agent's application blank. retor—quick starting—smoot! : Complete KAYAK BOAT CO. —quiet—cushion-mounted — EE ^d Dept. P, 147 E. 84th St., N.Y. no water jacket and pump to F. O-B. clog and wear out! Just the BMEILLALEBIEL ERN E thing for portaging—for small sailboats, to get you home—for dinghy or fishing boat 2 : power—perfect for canoe use—scores of newest aircraft F type features found on no other outboards! Cards, stationery, advertising, labels, paper, : circulars, tags, etc. Save money and time. Sold direct from factory only, Junior Press, $5.90. Job Press, $11. Power, $149. Do popular raised printing like en- graving with any of our presses, Print tor Others, Big Profits Pays for itself in a short time. Easy rules sent. Write for free catalog of outfits and all details, New Eclipse Electric Outboard Motor | Eclipse Electric Outboard runs on ordinary storage battery. Not a sound. $ 5 O Best fisherman's motor ever designed. ust the thing for women and girls. lectric model weighs only 20 Ibs, f.o.b. South Bend Write for full particulars NOW! Tha Kelsey Co., K 9, Merlden, Conn. NEW BOAT! Pope NR DD. MARINE PRODUCTS COMPANY Make dig money on each 20-lb. Mead 457 Bendix Drive, South Bend, Ind. KI-YAK you easily assemble at home : from Ioa “cut-to-ft Kil pe amazing LOW COST! Seaworthy. Fast! Snappicst GIVENI thing afloat. (Complete Sailing Hig, a se p oublis few dollars extra.) Rush 10c for illus- Í now given with trated folder and $6 Paddle Gift Offerl your Ki-Yak— MEAD GLIDERS, 12 S. Market, d if you hurry! Dept. M-5 CHICAGO, ILL, Broadcast over your own radio—mako qi “STAR METAL BOATS 7 Piona ton inon palvate senversations generate 110-volt electricity with hand-driven generator—build electric stove— | Original cost B thief detector—generate health rays—electro-plate,etc. 2D pieces $16.50 CATALOG genuine commercial npparatue, NOT TOYS salvage, bankrupt : : $ and sorplus stocks purchased from large concerne, Contains SPECIAL tf ‘A.C. 1lo-volt generator—small D.C. motor—excellent micro- t phone—traneformer—teat resistance wire—secret service micros $ a 99 z " phone—giant magnet A PPS &nodes— test cords and clipsCand — other valuable pieces. Weight 16 Ibs, Detailed instructions for A complete line of 50 fascinating experimenta, e : Ten Memes i i: ith h klt— rt Course in Electricity—Laboratory Bench: Plans well built metal Non-Sinkable FREE ! Z3 iss Prisci Order direct from this ad or send your neme Tor rowboats and out- board motor boats. Better T Free Catalog end Booklet ''20th Century Electronic Magic.’’ quality at lower prices. STAR TANK AND BOAT ELECTRICAL SALVAGE COMPANY COMPANY, Dept. MM -N. Cottage Ave., Goshen, Ind. Box 524-H , : Lincoln, Nebr. A SCREW FEED METAL CUTTING LATHE $9535 With features of a high priced lathe. Mod. 350—6 in. swing—12 in. between centers (Mod. 360 18 in. between centers only $10.93). Lathe comp. with COMPOUND slide rest—carriage ACME thread lead screw with ball crank— Face plate—two No. 0 MORSE taper centers and standard type tool post with Yocker wedge. Spindles are hollow—bearings of bronze—Takes all No. O Morse accessories——carriage, is DOVETAILED and securely GIBBED to bed— Both top and cross feeds are equipped with £lbs and a series of take up screws, Bed Is made of one solld piece of cast iron and is carefully machined—2 in, four jaw chuck $3.50. 4 in. $4.50. Adapter bushing 50 cents. Ball bearing thrust 35 cents—Shipping weight approx. 31 ibs. Send $1.00 with order, balance express C. O. D. BALKO ELEC. MOTOR & SUPPLY CO. Dept. B5, 10 S. Clinton St. Chicago. Itl. BALL BEARING THRUST—HOLLOW SPINDLES N O e Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 129

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INVENTORS Pages 10 and 11 INVENTORS PATENT YOUR IDEAS ET ae) Mad C ee od if ] li HOW TO OBTAIN A PATENT Ex ! written by a Former Member of the Examining Corps (1922-24) 3 of the U. S, Patent Office. If you want to profit by your iden, 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 enn 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, All 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 n" 1638 Woolworth Bidg., Dept. 56B, New York City E N Miller Building, Dept. 56B, Washington, D. C. Ml please send me your Free Book, “How to Obtain a Patent,” E Wy and "Record of Invention" form. n a a LEY a a eresse x ENE UNS des de. " m [| DRESS ....... eesesootopomeseverssevsecevo ove g ADDRESS " Nu : a WEHEHNENRENHHERHBENINNENMNEREHESENE 13 $50.00 In Cash Prizes for Best Ideas [Continued from page 77] probably can see a way in which these ideas can be improved, and certainly you have equally simple ideas concerning other fields, For years the manufacturers of perfume have been looking for a new and better method of stopping perfume bottles. Due to the high alcoholic content of perfume a per- fect and leak-proof method of bottle stoppage must be had. The inventor who can devise some sort of a magazine powder puff will also realize a great fortune. Not only is a great deal of powder wasted with the present puffs but powder is also dusted over the surfaces adjacent to the powder box. There is also needed some sort of a finger- fitting form that will permit the rapid appli- cation of nail polish. At the present time this material has to be painted on with a great deal of care. A light-weight triple mirror of the hand type with the two side mirrors easily adjust- able would fill a large need. The invention involved here would be that of finding the right sort of a hinge with which to hold the two side mirrors to the center mirror. Those inventors who are lending their ear to the complaints of ladies are hearing an in- creasing number of complaints concerning lip sticks and eyebrow pencils. Many women like to expose a considerable portion of the stick when it is used and under these con- ditions, the sticks will often break off. Some method of preventing this is needed. RULES 1. In 100 words or less explain your idea for a needed invention, This contest is open to everyone except em- ployes of Modern Mechanix Publishing Co., and members of their families. You don’t have to buy a copy of this magazine or be a subscriber to enter the contest. Write your name and address plainly on your entry. No entries will be returned. i The editors of this magazine will be the judges. Their decisions are final. Mail your entry to Inventions Contest Editor, Modern Mechanix Publishing Co., Greenwich, Conn. Entries for this month’s contest must be postmarked on or before May 1, 1936. N G2 AO Me Se HELP FOR INVENTORS The Editors of MODERN MECHANIX AND INVENTIONS MAGAZINE are always ready to assist inventors with their problems to the best of their ability. Since thousands of letters are received from readers each month, the editors can not devote the iime to make a thorough explanation or to do extensive research in reply to each letter. For more complete information on any problem of inventions or patents, we suggest that inventors write to the various firms advertising in this magazine that special- ize in your particular problem. 0 Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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INVENTIONS WANTED Turn patented or unpatented ideas into cash with this new book, Inventors’ Selling Guide, by Itaymond F. Yates, who has helped over 30,000 inventors. Nothing else like it—gives classified list of nearly 1000 manufacturers who buy Ideas, teils how to protect ideas without patents, how to sell chain stores, price inventions, etc. Covers Proved Methods of Selling, Finding Buyers, Royalty Contracts, ‘‘Rackets™ to Avold, Selling Patents Pending, Flnancing, Selling Unpatented Inventlons, many other vital topies. Cloth bound book, 224 pages, postpaid $2 for C.O.D., $2.12). Satisfaction guaranteed. TAKE OUT YOUR OWN PATENTS Pay only patent office fees. Valuable manual by R. F, Yates tells how to write SPECIAL OFFER atent claims, prepare draw- Three big 50-cent ngs, make searches, ete, books for Inventors; Assures inventor of strong Protecting and Sell- patents whether taken out by Ing Unpatented In. bimsell or his attorney. Post- ventions; 160 Mil- pald, complete with legal lion-Dollar Ideas for forms. $1.00. Inventors; Edison's FREE LIST OF NEEDED Secrets of How to INVENTIONS Invent—all three for Don’t waste time on Inventions the public $1.00 does not want, Write for free list of needed inventions and catalogue of books every Inventor and mechanic should have. DONLEY PUBL. CO., 509 Fifth Av., Dept. M-5, New York, N.Y. Grow Mushrooms in cellar, shed. Ex- elusive new process, Bigger, better, quicker crops. More money for you! Enormous new de- mand. We buy mushrooms, Write for book, Snot ses AMERICAN MUSHROOM INDUSTRIES, LTD., Dept. 587, Toronto, Ont. & M E Construction kit with machined barrel, magazine, neces- 6ary hardware and working plans. Colt calibre 45 automatic pistol $1.00. Postpaid, in U. S. A. No stamps, please. Cheeks 15¢ extra. GUN MODEL CO., Dept. DS, 2908 N. Nordica Ave., Chicago, Il. Kits for all model guns 50c up. FIBRE acs EXTRALITE FIBRE AND METAL LIMBS with patented adjustable soft sockets. Fitter service free in every state. MINNEAPOLIS ARTIFICIAL LIMB COMPANY 242 South Fourth Street Minneapolis, Minnesota ." Double the life of your coat and vest with correctly matched pants, 100, 000 patterns. Every pair hand tailored to your measure. Our match sent FREE for your O. K. before pants are made. Fit guaranteed. Send piece lot vest today. zT eee iow MATCH PANTS COMPANY 209 S. Stato St, Dept. 323 Chicago Build furniture, toys, novelties in your spare time. Make extra money. Tools are easy to operate. You can start a workshop for as little as $10.50. Write Dept. MM6 for free 40-page Catalog Walker-Turner C»., Inc., Plainfield, N. J. INVENTORS and MECHANICAL MINDED MEN Can You Answer these Questions? o For ihe answers to these questions and other informa- tion of value to you, look on page 18. 4 What is the only effective way” a . z to protect an invention ? in making t ? 9. 3. 9 nany patents were issued 4. : ider ed 5 ; esa mechan» a $ 6 d ie issuance of a pat- s 9 Why does the Patent Office ad- * vise applicants to employ reg- istered patent attorneys? 10 When ean an article be marked. * «Patent Applied For"? COPYRIGHT CLARENCE A, O'BRIEN Thank You for Mentioning Modern Mechaniz and Inventions Magazine When Writing to Advertisers 131

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Less than 20 minutes a day wilh these 7 big mechanical engineering books will prepare you for a better Job and bigger pay. Machine hands become foremen and supcrintendents, helpers become experts, foremen become man- agers, Any machinist, helper or factory employee cau benefit QUICKLY and put himself in a position to demand more money. Don’t miss this chance to qualify Your Opportunity for promotion, don’t put off for one minute this Big Opportunity which is yours almost for the asic- ing. Seven Bis Books chock full of every known mechanical fact, told so simply and clearly that nny one can understand them. Over 2600 pages, nearly 2706 tilustrations cover every subject fully, ins cluding Tool Making, Pattern Making, Foundry’ Work, Mechanical Drawing, Forging, in fact anything you need to know. Everything Sent FREE for examination. Yes ALL of these books will be sent to you for ex- amination. Decide in vour own home or place of business whether or not you want to keep them, check up on any facts you want to. Note their great MONEY MAKING value, then, if you want them, pay on the casiest kind of payments. * j Complete set of drawing instruments if you send for these books NOW. b These instruments are made of the finest of German silver, are absolutely accurate and are packed in velvet lined leatherette pocket case. Real $10 value, but freo to you with these books. —— — u— e n — ee ee ee ee American Technical Society, Dept. M-5320, Drexel at 58th St., Chicago You may send me the 7 big NEW books for free examination. I will ay the few cents delivery charges only unless I decide to keep them n which case I will send 52.00 in ten days and $3.00 per month until fhe total price of only $20.80 is paid. If I return them in 10 days I wl owe you nothing. Because I send now, you agree io give me a membership in the American Technical Society with Free consultation privileges with your experts for one year, and drawing instruments. Name ..-.-222---2-2-2-4--2--2-----.-222.-.----2-2.--------2-2-2-2---- Address -— =. -= Please attach a letter ating age, occupation, employer's name and address and that of al least one business man as reference, It's New! A TWIN » AT ONLY $79.50 and Mister F.O.B. Factory IT'S A JOHNSON NOW —a genuine Johnson Sea- Horse TWIN .. an improved ver- sion of the famous Johnson power head known 'round the world for DEPENDability and that sold in other years for as much as $145 e. with the highest official certi- fied power rating in its class .. for only $79.50 } Try it—and get the thrill of your life! 59.50 Y A SINGLE AT F.0.B. FACTO! Six other great models for 1936, including the new sensational, high quality Johnson Single at $59.50. The mew illustrated Sea-Horse Handy Chart tells all. Write for your copy. It’s free! JOHNSON MOTOR COMPANY 200 Pershing Rd., Waukegan, Il. Canadien Johnson Motor Co., Ltd, Peterboro, Canada FREE? Send for your Handy Chart JOHNSON (za-hors MOTORS OUTBOARD 132 Outshooting the Guns of Gangland [Continued from page 61] indicates how each man has scored. A bull’s- eye counts ten; the outer rings, from nine to five each. An officer must score an average of two hundred points from the forty qualify- ing shots to earn his “shooting money.” Up from the pits jumps a new set of targets. They are silhouettes—life-size drawings of phantom criminals, with the vital areas out- lined in white. The marksmen make five heart shots, then five head shots; next, five disabling shots—three in one arm, two in the other; and finally, five abdominal shots. Sergeant Joe Dirks unconcernedly asks Officer Naoka to poke a few holes in the target, near the heart, and the officer obliges by placing a circle of tiny perforations in the very center of the heart outline, although he is shooting with a strange 38 revolver at a range of twenty-five yards. Steady practice has had its result, for the police pistol team has won every state, national, and international shoot in which they have competed in the last five years. Their sharpshooting has been largely instru- mental in throwing a wholesome fear of police guns into the underworld. Largely on this account, crime records in Los Angeles for last year showed a reduction of 38% in the number of robberies, 28% in burglaries. Wells Photographs Into Future [Continued from page 127] foods are stocked, and a chemical atmosphere is manufactured within the chamber. And then—the terrible concussion! In an observatory high above Everytown, Cabal and Sir Raymond stand staring at a great telescope mirror, similar to the 200-inch ‘mirror to be installed at Mt. Wilson. A tiny streak of moving light marks the trail their children are blazing in history. “My God! Is there never to be an age of happiness? Is there never to be a rest?" Pass- worthy chokes. *For man, no rest and no ending," says Cabal, the scientist incarnate. "He must go on—conquest beyond conquest. All the uni- verse—or nothingness. Which shall be it, Passworthy?" Like the sombre voice of Fate from some illimitable bourne comes the echo: "Which shall it be?" And on that note of query our master guide, H. G. Wells, ends his inspiring vision. He is content to leave us with a picture of science and invention marching to their resistless ends, as they are marching as you read these words. Marching with such accellerated swiftness as to make his world of 2054 a too- conservative promise of wonders yet to come! Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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CHES OFF WAISTLINE “Director Belt reduced my waistline from 42 to 34 inches. I [feel 10 years younger. & Constipation gone—no tired, bloated feeling after meals.’ —G. Newton, Troy, N.Y. 4 Director Belt instantly improves your appearance, putssnap in your step, re- lieves “shortness of breath,” restores Your VIGOR as fat vanishes. Loose, fallen abdominal muscles go ack where they belong. Gentie mas- sage-like actlon Increases elimination and regularity ina normal way without use of harsh, irritating cathartics. You look and fee] years younger. NO DIET Let us prove our claims. — —M- No obligation. Write to- 5 day for trial offer. P LANDON & WARNER 360 N. Michigan Ave. Dpt. V-35, Chicago, lil. New projects for the craftsman with New World spot welders. Operate from 6-volt nutomoblle battery or light socket. Weld sheet metals, wire, rod, eic., up to 16 gauge. $5.75 battery model may be converted for light socket operation any time using special transformer—$9.50. Com- plete unit with 110-volt A. C, transformer, only $13.00. Free literature. NEW WORLD APPLIANCE CO., Dept. F 1214 Webster St., Oakland, California Learn to MOUNT BIRDS Tan SKINS, Make Up FURS Be a Taxidermist. We teach you at Home. E p ds, Animals, Pets, common specimens, Save your hunt- ing trophies; decorate home and den. Maka genuine KROME LEATHER,tan and make up furs for sparetime profit. FREE BOO K 48 pages tells - all about it. Hunters, get this wonderfulbook Its 4 Now Free. Send postal card Today— This Minute! State your AGE- a chool of Taxidermy, Dept.. 4735, Omaha, Nebr. TRAILER MAGAZINE New Ideas Galore E31 c Show Number of ''Caravan". worlc leading trailer magazine. Pub- lished in London. Shows dozens of photos, descriptions and articles of American and Englis| trallers. Latest, developments, ideas and designs, interiors, exteriors, X built-ins, gadgets, floor plans, etc., 56 pages profusely illustrated, Limited editlon_sample copy only 25c, year's subscription 12 big Issues $1.50. Send 25c W for big sample copy. Money back if not satisfied. BYAM PRESS, 304-M, W. 22nd St., Les Angeles US.GOVT JOBS Earn $1850 to $3000 a Year Excellent opportunities for cltIzens 18 to 50. No special experience needed. Railway Postal Clerks may earn $155 Arst month; Customs Inspectors as high as $3000 a year. Send for my FREE BOOK ''How to Secure a Government Posltion." It tells about government jobs nnd bow I help to qualify you for the job you want. Write At ONCE. Address Arthur R. Patteraon, PATTERSON SCHOOL, 438 Case Bldg., Rochester, N. Y. Float over cobble stones with 1936 Packard smoothness. Sail ™ over curb stones with hardly a jar. Ride mile: farther and faster with- out getline tired. Anybody cau attach KNEE ACT. quickly to any make or e bicycle E in Do minutes with a s wrench. Nothing to wear d out or get out of order. COMPLETE Patents applied for, Lasts a lifetime Be first in your town. SEND NO MONEY!—Rush postcard for your KNEE ACTION and Instructions. Pay postman only $1, plus few cents postage on delivery, Xf not delighted in 15 days, return and we'll refund your dollar. We Include FREE detatls on how to make money selling to friends. PACKARD KNEE ACTION CO., Dept. A-963, 4306 Marburg Ave. Cincinnati, Ohio DRE). “IF YOU DO NOT ADD AT LEAST 3 INGHES To Your CHEST IT WON'T COST YOU ONE CENT!” —Signed: Grorce F. Jowrrr. HREE SOLID INCHES of muscles added to your chest aud at least two inches added to each of your biceps, or it won’t cost you a penny. I know what I am talking about,...I wouldn't dare make this startling agreement it I wasn't sure J could do it. All | want is a chance to prove It! Those skinny fellows who are discouraged are the men 1 want to work with. Ill show them how to build a strong man's body ,. , . and do it quickly. And i don't mean tream-puff muscles either. Wouldn't you, too, Ilke to get a he-man's chest like the Idealized figure above? | will show you how to get real, genuine invincible muscles that will make your men friends respect you and women admire you! So many of my pupils have gained tremendous development that | am willing to stake my reputation that you can do the same... REMEMBER . , . If 1 fail it will cost you nothing! Send for “MOULDING A MIGHTY CHEST,” A SPECIAL COURSE FOR ONLY 25c T will not limit you to the chest; develop any part or all of your body. ‘Try any one of my test courses listed below at 25e. Or try all six of them for only $1.00. You can’t make a mistake. The assurance of the strongest armed man in the world stands behind these courses. RUSH THE COUPON TODAY AND I WILL INCLUDE A FREE COPY OF “Nerves of Stcel, Muscles Like Iron." It is a priceless book to the strensth fan and muscle builder. Tull of ple- tures of marvelous bodied men who telt you decisively how vou can build sym- metry and sirength the Jowett way! Reach out—grasp this Special Offer! E E BOOK WITH PHOTOS Ez OF FAMOUS STRONG MEN CER JOWETT INSTITUTE OF PHYSICAL CULTURE Dept, 37Ed, 422 Poplar St., Scranton, Pa. George F. Jowett: Send, by return mail, prepaid, the courses checked below for which I am enclosing............ O Moulding a Mighty Arm, 25¢ O Moulding a Mighty Back, 25e GEORGE F, JOWETT C1 Moulding a Mighty Grip, 25e “Champion {0 Moulding a Mighty Chest, 25¢ _, of Champions’! O Moulding Mighty Lezs, 25c Winner of many con- O Strong Man Stunts Made Easy, 25¢ tests for strength and physical perfection! C Al 6 Books for $1.00, AN BIS s cisci as iria Anio RENE IE Addres issues aside RA TR i E ES Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 133

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OIL FAILURES Cost Average Motorist $82.20 YEARLY The National Automobile Chamber of Commerce states that the average car owner spends $82.20 for motor repairs caused by oil failure. Automotive Engineers in an effort to overcome this expense, find that friction is their greatest foe. Particularly is this true in the modern high speed motors. SAVES REPAIRS AND OIL A new discovery called COLGRA SUPER- FILM creates a film strength so great that friction is reduced to a minimum and helps. eliminate many expen- sive motor repairs. In actual tests conducted with Standard SAE Timken Bearings, on a Weeks’ testing ma- chine using the best grade motor oil treated with COLGRA SUPERFILM shows three to five times the film strength as the SAME OIL UNTREATED. Users praise COLGRA and tell of big oil and motor repair savings. FREE OFFER TÓ DISTRIBUTORS COLGRA men are making big money. Fred Winatt of Los Angeles sold $2000.00 in one month; Mr. Eccals sold $200 in one day. Others report big sales. Good territory is still open. If you want a legitimate business of your own, send your name and address for full particulars and sample offer. Send today. COLGRA, INC., 423 W. Pershing Road, Chicago, Ill. THE REDSKIN'S RIGHT-OF-WAY! Bearing run In same oil treated out with OLGRA o withstands 20,000 pounds pressure. Bearing run in untreated oil pressure. Glide through glorious wilderness with an Old Town Canoe and a pack! ... The effortless stroke of a paddle takes you from camp to camp. You can fish and hunt in the gamiest haunts. Live the real life of an Indian! An Old Town Canoe is the birchbark’s twin, Only it’s tougher and steadier! Loak- proof and light. Inexpeneive to own. There's no costly up-keep, and prices begin at $68. Write for a free catalog showing paddling, sailing, sponson, and square-sterm types. Also sturdy outboard boats, including large seaworthy models for the family camp. Din- ghies. Rowboats. Address: Old Town Canoe Company, 275 Main St., Old Town, Maine. ‘Old Town Canoes’ America’s Appetite for Games [Continued from page 41] looming, it looked like a natural. He immedi- ately set to work, and before long had devised a game based closely on a national presi- dential election. Presidency Is Goal of Politics The task in Politics is to general one’s forces cunningly, and to keep careful check on the entire nation so that one may win 266 votes, the electoral majority, and thus be made president. “T wanted to make a game that would allow sociability,” explained Mr. Lord, “and would thus be a refreshing change from such conversation-kiling pastimes as contract bridge.” Some games allow interest to flag because only one player can play at a time, thus re- ducing other contestants to mere bystanders until their turn comes. Not so are Monopoly or Politics. While the player is not casting dice, levying rent or winning counties, he will do well to survey the progress of play and adapt changes to his own advantage. For a time the new game of Politics was jeopardized by a shortage of seemingly trifling things—pins. Each game requires a hundred different-colored pins with which players mark off the areas they have won. As orders began to stream in, Mr. Lord suddenly found he needed pins—millions of them. Soon he had scoured New York and bought every available pin. Still he could not keep pace with demand, and production of Politics was seriously curtailed until ar- rangements had been made with a factory to supply the vital pins. Public’s Taste Is Big Riddle The invention of games offers an attractive field for those of analytical minds. What does the public want? One who can answer that question holds the key to riches; but it is a hard question to answer. Inventors who have been successful with-one game have found to their chagrin that their next offering grew moldy on salesroom shelves. Yet one can post a few rules which most successful games have observed. Perhaps the most vital is that the subject of the game must have wide and. general interest. A game based on thermo- dynamics could hardly be expected to appeal to housewives. The balance between chance and skill is an important factor. Too strong an element of chance makes a game that requires little thought, and is consequently relegated to the nursery. Yet at least a small ingredient of chance is essential—it eggs one on to take risks, and produces greater excitement. 134 Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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BUIL Derby Racers - Midget Autos Cooster Wagons : Bicycle Trailers MAKE MONEY Wheelbarrows » Scooters » etc. START A BUSINESS "NITETCEHTRGT ia for yourself at home, building veht- eles with 10"x274" Musselman Doenuft Cord Tires and Ball Hearing Cadmium Plated Disc Wheels. Tire requires only 12 fo 15 lbs. air to carry loads up to 200 Ibs. per wheel. Patent No, 2015459. Doenut Tires take zess power to propel, literally float over road bumps and are winners in coasting contests, Woe show you how to build all of these vehicles, — They sell readily everywhere at a good profit. Blue- print drawings for any vehicle mentioned or B shown, 15c each for limited time only. Wheel and parts catalog FREE. MUSSELMAN PRODUCTS CO. 6249-E St. Clair Ave., Cleveland, Ohio = CA c (e Black & Decker Look at these Low Prices for High-Quality Electric Tools NEW |, U& INCH MAN IN EACH TOWN To Plate Auto Parts, Reflectors, Bathroom Fix- tures, Refinish Beds, Mirrors, Chandeliers, by new method; no capital or experience required. Simple plan of mavufacturing at home starts you in big money making business. Outfit furnished. Free particulars and proofs, GUNMETAL Co. Ave. P. Decatur, Hl, ate A PASSENGER Traffic Inspector A Good Pos ition Will Be Ready for You RELIABLE, TRAINED MEN—19 to 50 sare wanted now ae Railway and Bus Passenger Trafio Inspectors. Short, home-study course Gualifies you and upon completion we place you at up to $185 per month, plus expenses, to start, or refund tuition. Rapid advancement with experience, Free Booklet outlines our 17-yr. record. Write ? STANDARD:BUSINESS TRAINING INST., Div. 6103, Buffalo, N. Y, Oulfit Complete wit string, tools and directions 1 SPECIAL INTRODUCTORY OFFER: Good profits made restring- ing racquets, 37 It. string. Colors Purple, Green, Red or White Lalso White & Blue Splral— with contrasting silk trim, awls, stringer’ s wax, illustrated easy directions. Money back guarantec. Send for Free Catalog and Money aking Plant MAKE t Send Cash, Check or Money Order $1, MONEY which Includes Postage and Insurance. TOO * Gent C. O. D., if desired, 15¢ extra. PRO TENNIS STRING CO., pert WS HARMON, N. Y. Same Quality String As in Expensive Racquets Prepare yourself quickly for today’s biggest opportunlty— NEON or ‘gaseous tube” lighting—most widely used medium of lighted displays, the future’s grealest source of illumination, Splendid future for men in each locality who start now while it is still new. F R E E Send yout name for free booklet describing NEON'S oppor- tunities and complete data on Lhe practical €. L. home study course. Low enrollment fee will amaze you. WRITE TODAY! COMMERCIALITE LABORATORIES, BOX 47-M, OMAHA, NEBR. BE A TRAINED AUTO-DIESEL EXPER | PI PREPARE NOW forrich new fields of opportunity inthia fast- . flowing industry. Diesel-Trained Men needed for trucka, EARN BIG used, tractors, farm power and lighting plants, Practical, g P easy, spare-time training plan offers quick way tolgood jobs MO NEY - 2t good pay, or a profitable autorepair buslness of your own. Learn from the ploneer automotive home-study school. Li Write today for Free AUTO - DIESEL Book and pay-aa-you- BY END FOR learn plan, with valuable equipment included to help you earn extra money quick in spare time at bome without leaving FREE your present job while training. MOTOR INSTITUTE of AMERICA 4554 Broadway Dept. ED-13 Chicago, IIl. = Mail Coupon Today! = = = = = w MOTOR INSTITUTE of AMERICA 4554 Broadway, Dept. ED-13 Chicago, Ul. Without obligating me, send Free Auto-Dieeel Book, with full details of ‘‘Job-Way’’ Training and °**Pay- &s-You-Learn'' Offer, JUNIOR DRILL NEW 1,- INCH JUNIOR DRILL—a sturdy, practical drill which will handle a thousand and one jobs around the shop, garage or home. Drives twist drills up to 14-inch in metal; wood augers up to 14-inch. Cannot be stalled when working up to capacity. Also drives -wheels for light grinding, wire-brushing, etc. Big, easy-grip handle; sliding thumb switch; powerful Uni- versal motor; 3-jawed key chuck; long-wearing Compo bear- ings. A wonderful drill, at a wonderful price. Only $19.50, NEW ;-INCH JUNIOR DRILL —capacity up to 34-inch in steel; l-inch in wood. Also drives hole saws for cutting clean, round holes up to3J4-inch diameter in any ma terial a hack-saw will cut, Power ful Universal motor.A handy tool— at an amazingly low price. $35.00, NEW 6-INCH SPECIAL BENCH GRIND ER— Ideal for tool-sharpening, light grind- ing, buffing, polishing. Ad- justable tool rests and wheel guards; rubber feet anchor to bench without bolts; fine and medium grinding wheels. Built for years of use—only $24.00. MAIL THE COUPON today for the name of the nearest dealer where you can see these new B. & D. Tools and for free circular giving complete descriptions. MAIL THIS COUPON NOW The Black & Decker Mfg. Co., | 705 Pennsylvania Ave., Towson, Md. l l Please send me Free Literature describing new low- l | priced Blak & POT Tools and the address of my | nearest B. . dealer. | l Name ..---~~--------------------- 2-02 202 een een nn eee l | Occupation.------ nee ewe nee re neem ee sence nse ceeeee ene l l | Address--.------------- — ———— M l i 1 Thank Vou for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers 135

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AUDELS Carpenters and Bunders Guides 7 $4 vols.56 SR inside Trade information for Carpenters, Builders, Join- crs, Building Mechanics and all Woodworkers, Theso Guides give you the short-cut instruotions that you want— including new methods, ideas, solutions, plans, gystems and money asving suggestions. An easy progressive course for the apprentice end student, A practical daily helper and Quick ‘Reference for the master worker. Carpenters every- where ore using these Guides as a Helping Hand to Fusier Work, Better Work and Bet- : ter Pay. To get this assist nsi cen n ance [or yourself. si simply fill s ina je Inside Trade Information On: Vox the oU How to usc the steel square—How to file and set saws—How to build furniture—Ilow to use a mitre box—How to use the chalk lineo—How to use rules and scales—IZow to make joints—Carpenters arithmetic—Solving mensuration problems—Iia- timating strength of timbers—Ilow to set girders and aills—How to frame houses and rools—How to estimate costs—How to build houses, barns, gar- ages, bungalows, ete-——How to read and draw plans—Drawing up specifications—How to ex- cavate—How to use settings 12, 13 and 17 on the steel squarc—How to build hoists and scaffolds— skylights—How to build stairs—How to put on interior trim—How to hang doors—How to lath— lay Hoors—How to paint THEO. AUDEL & CO., 49 W. 23rd St., New York City Mail Audela Carpenters and Builders Guides, 4 vols., on 7 days’ free trial. I will remit $1 in 7 days, and $1 monthly until $0 is paid. No obligation unless I am satisfied. D HE teart M raras Er wem mm d UE [ros EU Buitaees| |Bovieras) |Bunscnt Tf O.R: Otherwise I will roturn them- Just Ouf, A a bL BODI-- ELIITTI, Tey, u^ LE ^ ed Every boy and girl will want one of these new Instruction Books. Written in such an easy simple way as to be understood by the youngest child, it takes you—step by step—right from the correct way to blow each single note up to the point where you can play complete selec- tions, Tells how to organize a Har- monica Band. Explains the different kinds of Harmonicas and their uses, HARMONICA PLAYING MADE £Asy ANTRO c. wiw vong ITS FREE Mail r this instruction book todas hs absolutely Free. ^ "^. MAIL COUPON M- HOHNER, Inc., 351 Fourth Ave-, New York Gy TODAY Z M. HOHNER, Inc., Dept. $91E 351 Fourth Ave., New York City { Please send me your new Instruction Boole. l | Num 2 essereenieecr enn et P Ra P de PR VET Y Sim | | Addréss ne | p Cit iS See State ........- d Address Canadian inquiries to Hough & & Kohler, Lt Ltd.. 4 468 K. King S St,W. W., Toronto 136 He Made Sky Mapping Big Business [Continued from page 46] central lens takes a vertical photograph, while the other four lenses simultaneously take oblique shots. The five prints are as- sembled into one group in the shape of a Maltese Cross (see diagram). While pilots and photographers ride their aerial pendulums, the ground crew swarm scorpion-like to the control points. This work is very important because it makes positive the accurate piecing together of the individual photographs to form the mosaic map. But securing the ground control points is costly, slow and hazardous work, for the Rio Grande country is mostly on edge. When the photography work is completed, the films are developed and a set of contact prints turned over to the engineering de- partment. The scale ratio of each print is carefully figured to the known distances on the equivalent terrain. After any accuracies are corrected, the prints are re-photographed to a common, accurate scale. The central portions of these corrected prints are then cut on lines which are determined by the ground contours and cemented down upon a composition base board, laid out with drawn pencil control lines worked up from previously gathered data. This master map is then rephotographed. Floods—Winter’s Aftermath [Continued from page 65] coastal inundations accompanying intense tropical hurricanes. However, by far the most common cause of all is the occurrence of un- usually heavy storm rainfall or cloudbursts. Cloudbursts of comparable intensity have occurred in Texas, in some of the East Gulf states, and at places along the South Atlantic coast of North America. But never in Ne- braska. Actually, the Republican Valley storm was in a class with ones we read about in Hawaii, the Philippine Islands, India, and other regions of heavy precipitation. Glendora, Oregon, is the wettest spot in America. Almost to a drop eleven feet of rain floods down there every year, no more, no less. One of the most recent developments in the art of gaging flood flow is the use of auto- matic, radio warning equipment at critical stations. When the river surface reaches a dangerous height the radio automatically begins broadcasting code signals which tell the engineer at the central office the name of the station and the stage of the river. The engineer can then send hydrographers to the scene to measure the flood. He can also notify people living along the river valley of the impending flood danger; so that the flood losses can be reduced as much as possible. Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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STRINGING TENNIS RACKETS a Stringing Tennis Rackets pays $1.80 profit on $3.00 restringing. No experience needed— we teach you how. Tennis players need new 6trings in their rackets two or three times yearly . every stringing means profit for you. See how simple it is to get in this business. Costs practically nothing to start. Easy work! Get started without delay. FRE Write Today . . . tellus who has been restringing your racket and we will send you free our 1936, edition of "PLAY AND PROFIT STRINGING TENNIS RACKETS'', including new low prices of TOMGUT * Court - Tested” Tennis Strings & Restringing Equipment. Write ‘Today! THOMPSON MFG. CO., 4547 Packers Ave., Chicago,U.S.A. Makers of TOMGUT ‘‘Cowrt-Tested” Tennis Strings & Restringing Equipment, HAVE YOU A RADIO IN YOUR CAR? Did you know that the Radio Builders! Manual. describes a fine 6-tube auto set? Why not get a copy and build your own? Send 50c today to MODERN MECHANIX PUBL. CO., GREENWICH, CONN. óc a TELEVISION EXPERT Here’s opportunity! Get ready for the best paid jobs in - Radio as Television sweeps the country. Train at big-time broadcasting station, Get actual experience over our Tel- evision Station W9XAL and commercial station WOXBY. Write today for free folder and literature showing actual photos of Television broadcasting, opportunities, etc. FIRST NATIONAL TELEVISION, INC. Dept. Q-5, Power & Light Bldg., Kansas City, Mo. A NEW PROFITABLE BUSINESS Profitalle: business ot your own. With simplitied Wi g. sed car motor mi Ni “Builds Your Own'' and save $300 to $500. 30 Days Trlal—Easy ‘*Pays-For-Itself” Terms FREE Valuable Book if you tell us you're § interested. HOBART BROTHERS CO., Box $M56, Troy, Ohlo PI50 r0? 200 DT NEW COLOR CATALOG FR EE! a Write for Free copy showlng new Ranger models, marvelous We ship on ap- proval. If not |¥ new prices and special offers! satisfied after trial return the bicycle at our expense. 30 Days’ Trial Ti res lamps, wheels, equipment at hal? usual prices, Lot Mead SAVE YOU MONEY on sundries. Mead sirr: anao | Pasos DITIONING ELECTRIC REFRIGERATION Men needed now in this new, fast-growing field. If you want steady work—uall year ’round—good pay, or a business of your own, prepare NOW. uch ground-floor opportunities are rare, Learn at iow cost right in your own home (or at our school in Chicago). Write today [or FREE Booklet. CHICAGO TECHNICAL COLLEGE. E-315 Tech Bldg., 118 E. 26th St., Be a High School Gi ra d U a t e portant for advancement soclally and !n business and industry. Don't be handicapped all your life. Be a High School graduate. Start your training now, f You can complete our simplified High School course at home es rapidly as your time and abilities permit. Meny finish in 2 years or less. Course equivalent to resident school work —prepares you for entrance to college. Standard H.S.texts supplied. Diploma awarded, Credit for HS . Bubjects already completed. Single subjects if desired. e Bulletin on request, No obligation. American School, Dnt. H528, Drexel at 58th, Chicago 32nd Year Chicago Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers "lll prove in only 1days ican make YOU a NEW No other Physical Instructor has ever DARED make such en offer By CHARLES ATLAS Holder of the Title: *"The World's Most Per- fectly Developed Man” OU don’t have ch to take my word —nor that of hundreds of my pu- Pils who have added inches to their chests, biceps, necks, thighs, and calves. Trove for yourself in just one week that you can. too, actually become a husky, healthy, NEW MAN! My Dynamic-Pension system does it. That's how I built myself from a 97-pound weakling to “The World's Most Perfectly Developed Man." Let me prove that you can get a big bal- anced muscular development in the same easy way, Gamble a Stamp — Mail Coupon for FREE Book! Dynamic-Tension is a natural method of developing you, inside and out— without using any pills, unnatural dieting, or tricky welghts or pulleys, that may strain your heart or other vital organs. It goes after such ailments as constipation, pimples, skin blotehes, and other conditions that keep you from really enjoying life. Gamble a stamp today. Mail coupon for a free copy of my new illustrated book, **Everlasting Health. and Strength.” It shows e THIS STERLING you, from actual photos, how I have de- SILVER gur veloped my pupils to the same perfectly BEIN balanced proportions of my own physique. GIVEN AWAY This valuable cup stands about 14” high on a black mahogany base. I wll award it to my pupil who makes the most improvement in his. development within the next three months. Jot your name and address down on the coupon. Send it to me personally. CHARLES ATLAS, Dept. 6B, 115 East 23rd Street, New York, N. Y. 4m CE a E E PCENA NN URN ee CHARLES ATLAS, Dept. GE, (15 East 23rd Street, New York, N. Y. I want the proof that your system of Dynamic-Tension will make a New Man of me—give me a healthy, husky body, and big muscle development. Send me your free book, “Everlasting Health and Strength.’ NOMIC? ougeyeyegórue puro üeinUew d. Augue s seva] ® (Please print or write plainly) Adress ce cage gacewee ne Muere qued uem m" CH sse ETT T TE e e Shale weeseesevoe © 1936 C.A.Ltd.” 137

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A. C. GENERATORS PRACTICAL, changes for automobile generators. See our advertisement at bottom of page 121. Autopower, Inc. ADVERTISING AGENCIES LEAKN Advertising quickly at home. Easy practical plan. No text Looks. Common school education sufficient. ln- teresting booklet and requirements free. Page-Davis School of Advertising, 3601 Michigan Avenue, Dept. 2044, Chicago. ADVERTISE: $15 reaches 6,000,000 readers with 24-word ad. Newspaper and mail-order magazine. Rate-Guide, free. Chicago Advertising Agency, 22 West Jackson, Chicago. ADVERTISE—24 words in 250 news- papers $10. Lists Free. Advertising Service Bureau, 4258 Drexel, Chicago. 30 WORDS, 25 magazines $1.00. Good- all Agency, 230 Bankers Investment Bidg.. San Francisco. FREE NEW advertisers rate guide. Brown Advertising Agency, 140 South Dearborn, Chicago. AGENTS WANTED FULL letter size stencil duplicator. Re- tails only $3.00! Prints letterheads, menus, advertising, ete. m col rs, Com- plete with ink, stencil, ete. Big demand —offices, stores, clubs, churches, restau- rants, etc. Enormous pronts to demon- strators. Free samples of work. Rocket Duplicator, Dept., A-874, Cincinnati, Ohio. 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- Jars and fre sample. American Mono- gram Company, Dept. 11, East Orange, New Jersev. REC LS SU Be ee ee DOUBLE-EYED Self-threading Needle Packages. sizes 3-9. Threaded instantly by blind and poorsighted. A necessity for every home. Five sample packages 23c. Twenty packages $1.00. Steven Spencer, 412 E. 51, Brooklyn. N. Y. MAKE 21295 Profit! Metalfix —Amaz- ing new “metallic liquid” instantly, per- manently repairs metal, wood, glass, leather; etc., without heat, acid or tools. Holds forever! Free sample. Write, Metalfix, Dept. A-315, Cincinnati. $6.85 HOURLY!—Amazing No-Flatz fixes punctures without patching; makes tires puncture-proof! Instantly, perma- nently seals holes made by nails, etc. Big seller. Free sample offer. No-Flatz, Dept. A-164, Cincinnati, Ohio. MEN! Here’s good paying work with a large shoe company. Good pay every day. No experience needed. Complete sales outfit sent free. Write Consoli- dated Shoe System, Dept. K10, Chip- pewa Falls, Wisconsin. WHY Work for Others? Have your own business and pocket all profits yourself, Real opportunity to make $60 a week. I send everything. Details free. Albert Mills, 2735 Monmouth, 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. 138 Classified Advertisements Rate for classified ads, 18¢ per word (include name, address and all numbers) per insertion, accompany order and be received in this office April ard for the June issue (on sale April 29th). Modern Mechanix & Inventions, 1501 Broadway, New York, $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. A-84, Cin- cinnati, Ohio. 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. MARRIED MAN to distribute Free samples coffee, flavoring, food products and make customers, Alust be satisfied with up to $3 in an hour. Permanent. Blair, Dept. 623-T, Lynchburg, Va. STEADY Cash Income resilvering mir- rors; replating fixtures, tableware. Easy factory methods. Experience un- necessary. Make outfits. O’Custer, HPa-224 Highland, Detroit, Mich. $2.00 HOURLY with new, scientific cream that mends all cloth easily, quici- ly, invisibly, without needle aud thread. Stands laundering. Free sample, Sew- nomore, A-736, Cincinnati, Ohio. 1000 BARGAINS, Drygoods, Notions, | Drug Sundries, Specialties, Novelties. Agents undersell stores. Free catalog. Jobbers, Dept. 598-A, 504 S. Crawford. Chicayo. GOOD Income Plating Auto Parts, KMeHectors, Mirrors, by new method. Outfits furnished; free particulars. Gunmetal Co. Ave. A, Decatur, Ill. CASH Income Daily Silvering Mirrors at Home, Plating Autoparts, Table- ware, Etc. Combination Outfit. Write— Sprinkle, Plater, 850, Marion, Indiana. GOLD Reflecting Letters for store windows. Easily applied. Large 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. AGENTS: Smash go prices. Santos Coffee 12e lb. 100 sticks Chewing Gum 12c. 150 other bargains. Carnation Co., MN, St. Louis, Mo. 500% PROFIT! Gold and colored sign letters for windows, ofhces, trucks, signs. Monograms. Easily applied. Neonite, Akron, Ohio. AGENTS?’ Gold Sign Letters for store windows. 500% profit. Free sample. Metallic Letter Co., 426 N. Clark, Chicago. CO-OPERATIVE Plan brings quick money. Everything furnished. G. Fin- ley, Box 669, El Paso, Texas. FREE! Descriptions, 450 newest money making opportunities. Metro- mails, M-12, Cincinnati. ANTIQUE FIREARMS AUTHORITY on Antique Firearms. What have vou? Information 25 cents (coin). Hale’s, Grand Haven, Michi- gan. Minimum 10 words. Cash must Address Classified Mgr., ART NOVELTIES "FREE Instructions." Write for free 10.Page Booklet on making beautiful, fast-selling Novelties, Bookends, Plaques, etc. Big Demand! Big Prohts! Stewart’s Studio, Dept. M-4, 2102 West 19th, Chicago. AUTOMOBILES SEMI - DIESELIZE - TO - ECONO- MIZE. Convert your car for $2.75 to $5.00 and burn cheap Diesel Oil. Works on any car. No major changes made in motor. Anyone of average mechanical ability can install. Parts available every- where. 6 big (814”x11") pages of Copyrighted drawings and instructions showing 2 different, tested, methods of conversion $1.00. Free booklet, stamp appreciated. Order your copy today. Earl J. Behling, Box 944, Los Augeles, California. AUTO OWNERS! Adapt your Auto- mobile for cheap Diesel fuel. No radical change. Increased mileage, perfect per- formance. Parts $4.00 anywhere. Guar- auntecd satisfaction with our superior plans $1.00 postpaid. Particulars Dime (refundable). Research, 126 Lexington, New York. MIDGET Auto Supplies. Blueprints— parts—whee!s—tires - -- motors — goggles —helmets—and useful information. Il- lustrated catalog, 10c. Paul Shipps, So. River Rd., Zanesville, Ohio. AVIATION ARMY AIR CORPS gives free flying training, salary, expenses paid. Infor- imation pamphlet, how to apply, 20c. Same information, Navy Aviation train- ing, 20c. Information on Marine Corps Aviation, 20c. “All threé, 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. Rebuilt 40 h.p. Motors $49.98. Aeroplane, boat, sled, wind-driven Generator Propellers, $2.50 up. Send 25c for more information. Hibbs, Fort Worth, Texas. PRACTICAL Course in Acrobatics, fully illustrated, $1 Complete. 200 Airplanes. $75 up, Directory, 25c, post- paid. Aircraft Directory, Athens, Ohio. YOUNG men interested in receiving Aviation Training under our Appren- tice-Plan see page 28. BLUEPRINTS BLUEPRINTS, 5 short wave sets $1.00. MM. Olenchak, 632 Windom, Pittsburgh, Pa. BOATS 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- town Specialty Co., 377M, Titusville, a. Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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HOW TO BUILD 20 BOATS—The big new edition contains twenty dilfer- 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 2% cents. Order your copy from Modern Mechanix Pub. Co, Fawcett Bldg., Greenwich, Conn. BOOKS 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 big book catalogue today. Levi Bry- ant, 654 East 44th Street, Chicago, Ill. 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 for the workshop fan. Refer- ence Book on science, mechanics, inveu- tions, and workshop hobbies are fully covered in the new 40-page MM Blue- print Booklet. Send three cent stamp to cover postage for your free copy. Modern Mechanix Publ. Co., Green- wich, Conn, WE PURCHASE all kinds printed matter. Old books, Bibles, magazines, etc., worth 50c-$5000, Enclose 10c for purchasing lists. International pook, Exchange, 33 Essex Street, New or

BURIED TREASURE TREASURE Seekers—Learn scientific methods. Wyss, 104% Francis, St. Joseph, Mo. BUSINESS OPPORTUNITIES THE PLASTEX Industry needs manu- facturers on small scale and for big pro- duction of Art Goods, Novelties, Souve- nirs, etc. in Plastex and Marble imita- tion. Experience unnecessary. 2¢ ma- terial makes 25c articles. Rubber moulds furnished for speed production. We place orders and buy goods. Small in- vestment brings big returns. Interest- ing booklet mailed free. Plastex Indus- tries. Dept. R, 1085 Washington Ave., New York. LEARN Marbleizing:

Concrete prod- ucts, statues, novelties, decorating, Floors resemble polished marble. Learn 73% pure rubber mold making. Last- ing. Amateurs make big profits. Cold rocess methods. No machinery. Dime rings George Washington mold and cast. Assorted samples. Cowell In- stitute, Grayling, Mich. IF YOU have some time you would like to use operating rug making ma- chine at home, and want big wages besides profit on rugs, ask for propo- sition, Easy, pleasant, profitable. Work when you like. Materials had every- where. Send today for offer. A Old American, American Trust Bldg., San Leandro, Calif. START Own Business Resilvering Mirrors, Refinishing Metal, Plated Articles, Autoparts, Tableware. Experi- ence unnecessary. Small investment. Combination outfit. Sprinkle, Plater, 845 A, Marion, Indiana. CASH Income. Make, Sell new non- scratching metal polish from seaweed. No rubbing. Formula, complete direc- tions, sample: $1.00. Venox Labora- tories, 1610 Colorado Blvd., Los Angeles, FREE ‘Folder of Opportunities”. Write Fairmount, 9 Hester, New York. Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers IF You Have Some Spare Room, a base- ment or garage where you can do light work, see our offer to Branch Manu- facturers on page 27, Metal Cast Prod- uate Co., 1696 Boston Road, New York ity. SELL By Mail, employ agents, Com- plete instructions in cosmetic manufac- turing $1.50. Sample formula, worth dollars, and literature for dime. Tanti Laboratories, Box 28, Milltown, N. J. 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. STOP Squealing—Start Crowing! Un- usual "plan." No canvassing! Work half days—home. Prepare for surprise! National Folio-C, Metr-Sta, Los An- geles. PUBLISII a magazine, sell books by mail. Big profits. Everything fur- nished. Start small. Business World, 503 Crary Bldg., Seattle, Wash. UNFAILING income, operating new $3.00 Stencil Duplicator. Cut rate “mimeo” supplies. Details, stamp. Mailmarts, MM15, Cincinnati. $$$—EARN Money selling metal key checks. Stamped sample and particu- lars, 15c. Irvin Buschkowsky, 508-M Oak, Chaska, Minn. CAN you copy simple cartoons? You may earn up to $37.50 weekly, duplicat- ing for advertisers. M-Syndicate, Argyle, Wisconsin. SUCCEED With Your Products. Formulas, Processes, Analytical Serv- ice. Information free. A. Thaxly Co., Washington, D. C. THE 20th Century business oppor- tunity. Get our free literature. Gold- d Co. 479 Broadway, Brooklyn, z

EARN Cash in Spare or Full Time. Send Stamp for Information, Andco Laboratories, 225—7th St. Rockford,

SELL by Mail! Books, Novelties! Bar- gains! Big profits! Particulars Free! H. Elfco, 525 South Dearborn, Chicayo. GET barrels of money-making mail. Your name in 10,000 Directories, 25c. Roservice, 4627 Glenshade, Cincinnati, LEARN the Collection Handle large sums. ciates, Syracuse, N. Y TATTOOING Outfits, Supplies—Cata- logue. Guaranteed Remover, “Waters,” M-965 Putnam, Detroit.

Business.

MAIL Business. Start small. Every- thing furnished. Free details. Metro- mails, M-5, Cincinnati. INVEST a stamp, idea works wonders, no obligation. -Stolzer, 712 Avenue O, Brooklyn. N. Y. DOLLARS Daily! order Businesses. Covington, Ky. HOME Money-making Opportunities. Literature Free, Ferland, Box 214-A, Bristol, Conn. CAMERAS AND PHOTO SUPPLIES 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. Start Home! Mail- Details. Duffy-Co.,

Write Cole Asso-

CAMERAS and Supplies. Free illus- trated catalog listing everything photo- graphic—still and movie cameras, films, lenses—at tremendous savings. hou- 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 So. Wabash, Dept. 2055, Chicago. 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. i MOVIE Projectors, Cameras, Films, at 30% to 50% off. Many used bargains. Leica $50.00. Trades accepted. Film library, catalogue free. Mogull’s, 1944-G Boston Road, N. Y. "PHOTO FUN"—Kinks, Tips, Tricks for amateur photographers. Send 10c. Photocraftsmen, Box 1688, Milwaukee, Wis. $5.00 VALUE. Pocket Folding Cam- era. $3.50, Mitchells, 10407 Lexing- ton, Kansas City, Mo. 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. arc Z CHEMISTRY < + 5 SEND 25c for new illustrated chemi- cal Experiment Book with over 300 formulas and tests. Also receive entry blank for $100.00 Cash Prize Contest. Illustrated catalog of apparatus and chemicals free. B. Winn, 124 West 23rd St, N. Y. LEARN Chemistry. $125.90 course with laboratory, now only $45.00. Easy payments! Other courses, $15.00. De- tails free. C.C.S., 4931-N Hamlin, Chicago. DETECTIVES BECOME a Successful Detective. Ex- perience unnecessary. Detective Paper and Particulars FREE. National Sys- tem, Box 425-D, Fremont, Nebraska. DETECTIVES—Make Secret Inves- tigations. Experience unnecessary. De- tective particulars free. Write, George Wagner, 2640-V Broadway, N i BE A DETECTIVE. Make secret in- vestigations. Experience unnecessary. Write United Detective System, 1623D W. Grand, Chicago. DUPLICATORS INCREASE Business. '""Excellograph' Rotary Stencil, Clay, and Film Duplica- tors $3.85 to $37.50. Prints anything typewritten, penned, drawn, traced. Colors. Folder Free. Pittsburgh Type- writer Supply, Suite 519, Pittsburgh, Pa. EDUCATIONAL & INSTRUCTION WANTED Immediately, Men-Women, age 18 to 50, qualify for next eligibility test for steady Government Jobs; com- mence $105-$175 month. Common edu- cation, paid vacations, pension., Valu- able information from our Civil Service Expert mailed Free. Write, Instruction Service, Dept. 234, St. Louis, Mo., Today. FOREST Jobs available $125-$175 month, Cabin, hunt, trap, patrol. Qualify immediately. Write Rayson Service, B-32, Denver, Colo.

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MEN Wanted—Learn Tool & Die Making. Automatic Screw Mach. Ma- chinist Trade. Big Demand. Actual Experience. Expert Supervision, Write ior Free Book "M". Allied Screw Machine Co. Inc. School Div., 603-9 Lake St., Chicago. USED Correspondence Courses and Educational Books sold or rented. Inexpensive. Money-back guarantee. Write for free catalog listing 4,000 bargains. (Courses bought.) Lee Mountain, Pisgah, Alabama. U. S. GOVERNMENT Jobs. Start $105-$175 month. Men-women. Pre- pare now for next scheduled examina- tions. List positions, Free. Write im- mediately. Franklin Institute, Dept. 375, Rochester, N. Y. WANTED—Names of men desiring outdoor work; $1700-$2400 year; patrol forests; protect game. Qualify imme- diately. Details Free. Write Delmar Institute, A-32, Denver, Colo. EARN $250.00 Monthly. Draw Show Cards. Instruction Book, $2.00. Mitchell’s; 10407 Lexington, Kansas City, Mo. CORRESPONDENCE Courses. Big catalogue 10c. Hanfling, A-799 Broad- way, New York. ELECTRIC MOTORS NEW 74 H. P. 1750.R. P. M. Rep.- Ind. Nationally-known motors $19.50. Send for Free Listing. Jackson Elec., 2124 Cortland, Chicago. ELECTRICAL SUPPLIES HUNDREDS of new and rare items, replacement parts and supplies. Send 3c for new, 60-page, wholesale catalog. Autopower, 412 S. Hoyne Avenue, Chicago. FARM LIGHT PLANTS FASCINATING profitable business. Build amazing electric plants cheaply, from washer engines, automobile gener- ators and parts. Operates lights, washer, radio. Instructions, illustrated circular, wholesale catalog 25c. Elec- tric Manufacturing, St, Paul, Minne- sota. AMAZING profitable business. Build new farmlight, automobile batteries from old. Recast new plates, all lead castings from junk batteries. Battery Laboratories, St. Paul, Minnesota. FIREARMS 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-E Victor Building, Washington. D. C. PATENTS—Before too heavy an out- lay of time or money is made on an invention, a search of the Patent Office records should be made to determine as nearly as possible whether or not the same idea has been patented before, The cost of this search is small, while the value of the facts it uncovers is often considerable. We offer inventors and manufacturers a thorough, prompt, confidential search service—plus ex- perienced counsel and assistance in every phase of Patent and Trade-Mark practice. Write for our new free book containing valuable information relat- ing to patent procedure. Clarence A. O'Brien and Hyman Berman, 28-M Adams Building, Washington, D. C. (Registered Patent Attorneys before U. S. Patent Office). SMALL inventions wanted by manu- facturers. I'll help you sell your in- vention. S. Hull, 7829 Euclid Avenue, Cleveland, Ohio. FORMULAS SPECIAL Formula Headquarters! Drug product label copy prepared, Chicago Techniservice, Room 1112 Merchandise Mart, Chicago. BIG Money in Cosmetics. 25 proven and successful cosmetic formulas, 50c. Black, Suite 206, 131% West Com- merce, Oklahoma City. SUCCEED With Your Products. Formulas, Processes, Analytical Serv- ice. Information free. A. Thaxly Co., Washington, D. C. GUNSMITHS’ Secrets—Bluing, check- ering, engraving, ete., 25c. Interna- tional Agency, Cincinnati. FISHING SUPPLIES BAMBOO Fishing Rods—build or re- pair—save half cost. Send 25c (coin) for “Bamboo Rod Making” most com- plete hook, covers all details. Don C. Bell, 1408 Isabella St., Wilmette, Illi- nois. FOR INVENTORS WE Successfully Sell inventions, pat- ented and unpatented. Write for proof, and tell us what you have for sale. Chartered Institute of American Taventors; Dept. 5-B, Washington, WE SELL or obtain finances on pat- ented and unpatented inventions safely and economically. The Inventors Guild, Fourth Floor, Central Bldg., San An- tonio, Texas. INVENTORS—Sell your inventions before patenting. Free particulars. Write y Greene, 942 Barrister Building, Washington, D. C. 140 NEWEST guaranteed formulas. Big- gest catalog free. Special prices, leads. Gibson, Chemist, CE-4704 No. Racine, Chicago. 525 PRACTICAL Formulas 25c. Profitable Literature free. Pelishek's, Adell, Wisconsin. FORMULAS-—-Latest money makers. Literature free. D-Belfort, 4042 N. Keeler, Chicago. FORMULAS—AII kinds. Guaranteed. Catalog Free. Kemico, 67, Parkridge, Illinois. FROG RA!SING “FROG RAISERS WANTED”! Start Backyard. Big profit opportunity. We furnish breeders, instructions and buy what you raise. Write, Free Frog Book and literature. American Frog Canning Company (142-E), New Orleans, La. HELP WANTED MEN WANTING JOBS—New con- struction work in U. S., So. America, write Continental, B28-1614 Broadway, Gary, Indiana. Enclose stamp. HYPNOTISM HYPNOTIZE Instantaneously! Learn how! Instructions 25c. Lonk Institute Hypnotism, D-1313, Palatine, Illinois. INDIAN RELICS, CURIOS 15 ARROWHEADS, Spearhead, Lancehead, Pottery $0.99. Peacepipes, Bannerstones, Flintlocks, Matchlocks, Curios. Photolist 10c. Paul Heikes, Rutland, Illinois. ^ INVENTIONS INVENTIONS Sold on Commission Basis. Also Engineering and Develop- ment Service. Patent Engineering and Brokerage Co., Box 404, Green Bay, isc. INVENTORS’ Primer answers every question right, Saves you dollars. Copy postpaid $1.00. Adam Fisher Co., 582 Enright, St. Louis, Mo. HAVE you a sound, practical invention fer sale, patented or unpatented? Tf so, write Chartered Institute of Ameri- at Comes Dept. 5-A, Washington, INVENTIONS Commercialized. ented or unpatened. Write Adam Fisher Company, 582 Enright, St. Louis, Mo. LAWN MOWER SHARPENING LAWN Mower Sharpening made easy. Build our handy vicestand, blueprints, photos, instructions. $1.00, Wirt & Engle, West Burlington, Ia. MAGIC TRICKS & NOVELTIES BE LUCKY, carry a Piute Luck Crys- tal, old time prospector has limited supply from secret Indian Mountain in Death "Valley. Price $1 each. E. Conord, South Branch, New Jersey. 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. 698, 504 S. Crawford, Chicago. MALE HELP WANTED — —— MEN WANTED at once to call on stores with newest line self-selling 5c and 10c necessities. Strong, original counter displays. Aspirin, Mercuro- chrome, razor blades, household cement, etc. Automatic sellers. Many new items. Up to 125% profit. Big catalog Free. Procopax, Dept. 95-YD, 1956 S. Troy, Chicago. Toy, vürcago. aL ————— BIG advance cash profit selling men’s quality hats, made-to-measure, rain- proof caps. Bargain prices. Your own hats, caps, Free of extra charge. Outfit Free. Taylor Hats, Dept. C23, Cin- cinnati, Ohio. MALE & FEMALE HELP WANTED MRS. M. M. Earned $538 in Het Cellar (sworn statement) raising pat- ented giant mushrooms for United (established 1908). Exceptional? Yes, but Your cellar, shed, barn may be suitable to bring moderate income all winter. Book, sample Free. United, 3848-A236 Lincoln Avenue, Chicago. oe EE ee MALE INSTRUCTION So a E T DETECTIVES. Work home or travel. Experience unnecessary. Write, Ameri- can Detective Institute, 2640-T Broad- way, N. Y. Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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. MIDGET CARS MONEY MAKING OPPORTUNITIES MIDGET CAR, Pushmobile, Coast- mobile, Chassis Plans, 50c coin each includes Parts List, Wheels, Etc. Chala Midget Auto Parts, 3354 Russell, No. Minneapolis, Minn. MISCELLANEOUS TROPICAL Woods of Cuba. The most beautiful woods. Send 10 cents (coin) for descriptive literature and prices. Dr. Wm. F. Ordetz, P, O, Box 1283, Havana, Cuba. POOR Man's Heater (fireplace) saves 60%. Plans 50c. Money back guar- antee. Plantation, Trenton, South Carolina. ; ELECTRIFY Old Clocks, antique and modern. Particulars 10 cents. H. Folk, Walnut St., Milton, Pa. WHOLESALE Supply Sources, half million items. 10c. International Agency, Cincinnati, BURIED treasure Minerals, free book- let, photographs. Fisher, Palmer Bldg., Hollywood. MODEL MAKING EASY-BUILT 00 GAUGE (34-inch Nason Railways, Dept. X5, New Rochelle, New York RAILROAD Model News. New monthly publication for model builders, $1.50 year. Sample copy 10c. Railroad Model News, 1201B McGraw-Hill Bldg., New York, N. Y. MODEL Steam Locomotive 34” scale. Easily made. Particulars, casting list, photo, 25c (ret. on Ist order). Little Engines, Box E-15, Wilmington, Calif. MAGAZINES, books for modelmakers. Write for free list. 25c brings sample Modelmaker and Model Railroader. Modelmaker Corp., Wauwatosa, Wis. MODEL MAKERS--See our ad page 26. Evray Mechanics Supply Co. MODELS & MODEL SUPPLIES A PENCIL-LENGTH model locomo- tive, authentic in every detail! Table top railroading is no longer the model- makers dream. Anyone with the slight- est mechanical ability can construct this electrically operated locomotive and tender by following the detailed plans appearing in the 1936 Edition of How- To-Build-It. Send 50c for your copy, now! Modern Mechanix Publ. Co., Greenwich, Conn. YOUR Ideas developed into practical working model. 30 years successful experience; thousands satisfied custom- ers. Confidential service guaranteed. Bank references. Send 3c postage for 32 page book “Making Inventions Pay.” Crescent Tool Company, Dept. T. Cin- cinnati, Ohio. MODEL MAKERS-— Brass, copper, fibre, steel and aluminum in all shapes, also castings, gears, screws and fittings. Catalog 10 cents. Experimenters Supply Ton Dept. M, Box 10, Station Y, N. Y. EVRAY'S Models—Engine Castings, Books, Blueprints, Materials and Sup- plies, Advance Bulletin illustrated cir- cular for stamp. EVRAYmesco, 28 No, Clinton, Chicago. Thanh You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers $50.00 a Week With Car and Camera— big profits with your inexpensive cam- era. Described on Page 62 in new Photographic Almanac and Bargain Book of Cameras and Supplies. Write for Free copy, Central Camera Co., 230 So. Wabash, Dept. 2255, Chicago. HOME, Money Makers. Illustrated Instructions. 25c coin. Ramsey Co, 314 N. Church, Charlotte, N. C. HOMEWORKER Magazine — 1,001 profitable ideas! 3 months, 25c. Mail- marts, Cincinnati. MOTION PICTURE AND SOUND EQUIPMENT CENTRAL'S Free Photographic Al- manac— Bargain Book explains latest movie developments, offers money-saving bargains in cameras, lenses, projectors, films. We take your old camera or equipment in trade. Write! Central Camera Company (Photographic Head- quarters since 1899), 230 So. Wabash, Dept. 2155, Chicago. SUPERSPEED Panchromatic 16MM film, 100 ft. $3.75. Other films from Bargains in new, used equip- . Send for circular. Fotoshop, 13474 F West 32nd, New York. HIGHEST prices paid for used still- movie equipment. Send description. Fotoshop, 13412 F West 32nd, New York. 35MM. ODD Reels $1.00. Features, Projectors. Marsala Company, Hills- dale, New Jersey. 16MM FILMS bought, sold, exchanged. Catalogue 10c. Fotoshop, 13414F West 32d, New York. MOTORCYCLES SEND 10c for new 1936 Handbook of Information, on motorcycles, listing new and used parts, accessories, repair- ing, for all makes. Indian, 622 E. Grand, Des Moines, Iowa. SEND 15¢ 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. 3 ALLOY Pistons. Harley, Henderson, Indian, Excelsior. Used parts, catalogue and wings pin 10c. Ballak, 100 N. 12th, St. Louis, Mo. MOTOR WINDING DATA WINDING Data for 700 A. C. motors one-fourth to 150 horsepower, Al speeds, voltages, Accurate. $2.50 U. S. A. $3.25 foreign, Mooney, 2325 Wilson Ave., Chicago. WINDING DATA, 100 AC motors, various horsepower and voltage, $1.00. Motor Data Service, 3002 Monroe, Kansas City, Missouri. MUSIC & MUSICAL INSTRUMENTS PIANO hy Ear in thirty days guaran- teed. Particulars free. Day-V-Way, D530, Woolworth Building, Dearborn, Michigan. OFFICE EQUIPMENT TYPEWRITERS, multigraphs, address- ing machines, adders, dictaphones, dup- licators, sealers, folders. Save half, write Pruitt, 553 Pruitt Bldg., Chicago. OLD GOLD WANTEO GOLD. is $35.00 ounce, Cash for gold teeth, watches, jewelry, 100% full cash value mailed day shipment received. Satisfaction guaranteed or articles cheerfully returned. Licensed. Infor- mation free. Chicago Gold Smelting & Refining Co., 300-C, Champlain 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 estab- lish 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 ta the man with a good invention. Ad- dress: Victor J. Evans & Co., Regis- tered Patent Attorneys, 820-E Victor Building, Washington, D. C. PATENTS—Before too heavy an out- lay of time or money is made on an invention, a search of the Patent Office records should be made to determine as nearly as possible whether or not ‘the same idea has been patented before. The cost of this search is small, while the value of the facts it uncovers is often considerable. We offer inventors and manufacturers a thorough, prompt, con- fidential search service—plus experi» enced counsel and assistance in every phase of Patent and Trade-Mark prac- tice. Write for our new free book con- taining valuable information relating ta patent procedure. Clarence A. O'Brien and Hyman Berman, 28-M Adams Building, Washington, D. C. (Regis- tered Patent Attorneys before U. S. Patent Office). 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 inventionis, 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. PATENTS PATENTS. Booklet free. Highest references. Best results. Reasonable fees. Watson E. Coleman, Victor Build- ing, Washington, D. C INVENTIONS Wanted—Patented, un- patented. If you have an idea for ‘sale, write Hartley’s Inc., Box 928-J, Ban- gor, Maine. INVENTIONS Commercialized. — Pat- ented ot unpatented. Write Adam Fisher Company, 582 Enright, St. Louis, Mo. 141

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PATENTS—Reasonable Terms. Book aud advice free. L. F. Randolph, Dept. 341. Washington, D. C. PENMANSHIP soe ee IMPROVE Your Penmanship. Par- ticulars free. Enclose quarter and re- ceive twelve cards showing name beau- tifully written. Expert Penman, Box 194, Pasadena, Calif. PERSONAL DEVELOP Personality, sex appeal, charm, magnetism. Attain’ power, suc- cess. Overcome bashfulness, fear, tim- idity. Send for free booklet “Power of Personality." School of Personal De- velopment, D-204, Woolworth Building, Dearborn, Michigan. WANT Job? Effective letter of appli- cation prepared. $1.00. Rahn, 7 Dear- horn, Chicago. PHOTO DEVELOPING FINER Finishing—Rolls developed and printed, colored Enlargement, or two double professional enlargements, all for 25e (coin). Genuine Nationally Known Moen-Tone Superior Quality. Moen Photo Service, La Crosse, Wis. FILMS DEVELOPED-—25c coin two 5x7 Enlargements, 8 High Gloss Never Fade Prints. Club Photo Service, La- Crosse, Wis. : ROLL developed dated Gra-ro-tone prints 25c, colored pocket mirror 25c coin. United Foto, 2242 N. Kenneth, Chicago, Ill. PHOTO FILM FINISHING DEVELOP and print your own pic- tures. Save time, money with our complete $1.00 outfit postpaid, or pay postman $1.10 C.O.D. Includes electric ruby lamp, printing frame, photo paper, chemicals and equipment. One of thou- sands of amazing bargains in our free Photographic Almanac and Bargain Book. Send for it today! Central Camera Co., Dept. 2455, 230 So. Wa- bash, Chicago. POCKET RADIOS “POCKET RADIO”, $3.85 Complete. Catalogue, 10c. American Business Service, 353-MM M, Shamokin, Penn- sylvania. POEM—SONGWRITERS POEMS—Set to music, Published. Free examination. Send your poems. McNeil, Bachelor of Music, 1582 H. West 27th St., Los Angeles, Calif. WANTED: Original Poems, Songs. MMM Publishers, Studio Bldg., Port- land, Ore. SONGWRITERS! Astounding offer. Ray Hibbeler, D195X, 2157 N. Avers, Chicago. PRINTING 2000 BUSINESS CARDS neatly printed $1.50. Free samples. Atlas Distributing Co, 1814 Bedford Ave, Pittsburgh, Penna. 1,000 LABELS, 60c money Order. Extra lines 10c each. J. Skeba Print, 209 Lawrence, Rome, New York. PRINTED Personal Stationery—100 Envelopes — 100 Letterheads $1.00. Halberstadt Printing, Terre Haute, In- lana. 1,000 BUSINESS Cards $1.50, post- paid. Doerr, 2450 LaSalle, Niagara Falls, New York, QUALITY Printing! or Envelopes, $1.00. Wilmore, Ey. 142 1x2, 3 lines, 300 Letterheads Sewellprint, Sky Maps On Movie Film Shown By Flashlight The study of astronomy is simplified by means of a new stellarscope re- cently invented by Walter Bartky of the University of Chicago. On a strip of movie film are printed 24 sky maps illuminated by a pencil flashlight. Stars appear as natural as those in the sky. RADIO AND 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- paraiso, Ind INSTRUCTIONS 18 Distance Crystal Sets — record 2100 miles; ‘Radio- builder” year; 25c. Laboratories, 151-K Liberty, San Francisco. REAL ESTATE OZARKS—40 acres, unimproved, $100, $5 monthly. Near fishing. Free Litera- ture. Hubbard, 224 Grossman Bldg., Kansas City, Kansas. ROOTS AND HERBS FREE! Send for this amazing new “Herbalist Almanac.” Interesting! Instructive! Educational! Contains over 200 valuable herb medicine recipes and Indian secrets for home use. Beautifully illustrated in natural colors. Needed every home. Dime covers postage and handling. Write to- day! Bontanics, 145 West 112th Street, Chicago. SALESMEN WANTED TATTOOING LOW Cost Amateur Tattooing Outfits, free folder. Chicago Tattoo Supply House, 653 South State, Chicago. TELESCOPES, MICROSCOPES, ETC. EVERYBODY’S making observatory type astronomical telescopes, magnify- ing up to 300X for $15 up. Bowman Telescope, C2 Centropolis, Kansas City, Mo. 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. BARGAINS! Telescopes, Microscopes, Binoculars. Catalog free. Teeko, M515, Evanston, Illinois. 6” REFLECTING Telescope 60” long, $25. Larger sizes on request, Lutts, Norwalk, O, TRAVEL WANT Free Voyage Honolulu and Return? Write, enclosing stamped en- velope, F. Livingstone, P. O. Box 382, Puyallup, Washington. VENTRILOQUISTS LEARN Ventriloquism by mail; small cost, 3c stamp brings particulars. Geo. W. Smith, 125 North Jefferson, Room $-645, Peoria, Ill. WELDING 100 PRACTICAL Arc Welders and other changes you can make. D.C. power motors and generators make high capacity arc welders. Car gener- ators make arc welders, A.C. and D.C. generators, wind light plants, wind chargers; also 110 A.C. motors for grinders, drills, etc. All in one hook with plenty of prints. ‘Written So You Can Understand It”, Price $1.00.. No checks. ‘‘Monroe-Method”’, Box 3343 St. Paul, Minn, GET full-size, 150-pound Electric Are 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. D-14, Oak- ley, ' Cincinnati, Ohio. PRACTICAL 200 Amp, welder built from old farm light plant. Small cash outlay. Gets the job done. Blueprints, specifications, $5.00. City Electric Shop, Snyder, Oklahoma. ARC-WELDING Outfit $1.25. Weld fenders, braze, solder. Lavrow, 4368-W, Warren. Detroit. Stamp appreciated. ARC-WELDER easily constructed. In- structions 50c (coin). John Halloran, 1308 South 24th, Phila. WIND ELECTRIC LIGHTS EARN up to $100 weekly underselling stores. Fast selling necessities. We furnish stock, Write today for Cata- log-agency offer. National Products, 104. Berwyn, Ill. GOLD Reflecting Letters for store windows. Easily applied. Large sizes, penny each, free samples! Atlas Sign Works, 7941-G Halsted, Chicago. SPECTROSCOPES SPECTROSCOPE with book of 120 experiments. $2.50. Cudding Sons, Campbell, California. Thank You for Mentioning Modern Mechanix and Inventions Magazine ELECTRIC Light-Wind Driven, auto- matic control, build your own electric plant. Copyrighted Blueprints. Write Wind Motor Electric, Ridgway, Mon- tana. WIND ELECTRIC PLANTS Kits 6 32-VOLT wind electric plants. $10.00 up. Parts catalog, plans 25c. Currier Mfg. Co., Minneapolis, Minn. GENERATOR Propellers, expertly de- signed at factory prices. Hibbs, Fort Worth, Texas. When Writing to Advertisers

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BROADCAST your voice on programs coming through your joget--make an- nouncements from any part of honse sInject wise cracks, josh and mystify friends. **World Mike'* made especially for home use, attached in a jiffy, Nota Toy. Also put on gen ore f grame at home, parties, clul affairs, Barrela of funl Easy to operate. PRICE 25c POSTPAID Johnson Smith & Co. Dept. §40 ^ Detroit, Mich. CRYSTAL RADIO 25c "This is a radio in itself, as it ts possible to get reception with it alone within 25 milos of a Btation (or up to 100 miles under g conditions), Allyou need is an soria & earphone, Completely assembled and wired, with sapersensitive eryatal, ctand, base, crystal cup, erm with pate whisker, et m Reception guara: tead. Only pp TELEGRAPH SET A Private Electric Telos garh Set for only 15ci se it as a practice aet or send messages to frlends (sending end receiving), Learn tie cede easily and fer. WOASH rciegraph Set Electrician 100 iuo t leotrlely. tul, leottía lectrlo pd. JU-JITSU DON'T BE BULLIED The Japanese art of self-defense. New methode of ei ttack and de- fense aro given, illustratod so that 'ou cannot feilto understand them. eals fully with trips, throws, wrist locks, body holds, defense against revolvers, atran, fing, arm- locks, scissors, splits, head lock, holding a mau down, double knee throw,stick attack defense against knife, one hand throat grip, de- {ense against two assallanta, stom- ach throw, secret thumb knockout, nerve pinches, and numerous oth- ers, Learn to protect yourself un- der all circumstances with natare’s weapons. Fear no man, guna o knives! ‘Science of Ju Jitsu” Only 30 cents nostnal IAUTO SCARE BOMB The Auto Bomb fa attached to th part of the motor, e instant your & ctim” steps on protection than an insurance thief Inthe ect. Price 15c odch, 3 Tor 40e. $1.95 thief In the act. Price 15c eac for 40e. . per doz. Shipped by Express. ' Not bane It looks like a eadly weapon, but it is merely e novel Ciga- rette Case. tter than the real thing in many an awk- yard encoonter. Great fon *'eticking up'' your friends. They squirm and protest. Pull gor and the slide files lisclosing the cigarettes. E 25c ppd. Cotaloo 108 DANCING x TEST STEPS. Be popu- 2 pA Gooddancersare clwaya admired —always popular ests. Partners welcome em eagerly. The newest, &martest steps without a teacher. Don't make excuses when the music starts, Get lote of fan from parties and dances. If you want to become a perfect „dancer, learn to dance at home this new, easy way. B TELLS: How to develop polee &nd control, improve your ice steps, art of holding, howto walk to music, how to lead, latest Fox Trot steps. Natural and Reveree f be e Reverse Wave. the mickstep, swaying to maosic, falta, Bicuward ‘Changes the ontinental, the femous K isa lance, the Manhattan, the College humba, the Carlo, Charleston, nd many others. Art Of Danc- IDE. Price 25 Cents Postpald, W YOUR VOICE Into a tronk, unger tne ~ bed oranywhere. Lots of A ficouas of friends’ Poe e ğ fade ag & little instrument, fits inthemoath ent ofsight, used with above for Bird Calla, etc. Anyone can use It. Never falls. A G4 age course on Ventriloquism ogether with the Ventrito. All for onty 10 cents postpaid. RN TO VAMP Would you like to play the piuno or organ wlthout doing through the drudge Pery of learning, the scales and keys and without tedi- n ows practice? The Vamp- : mi — Ing Tutor isa greatly aims plified method, which, after a little practice, enables you to play the accompeniment to any tune or song written in any "time" or in any “key.” No knowle edze of musio necessary. Once you have mastered the aystem, you will be abie to play the accompaniment to sonts, ballads, waltzas, the Intost hits, etc. entirely by eer without any music, Price 12 cents posipald. BLANK CARTRIDGE PISTOL REVOLVER STYLE. VENTRILO ge Three new models now and $1.00. Well madeand effect- ive. Patterned afte- latest type of Revolve A. er. Appearance alone Er will scare a barglar, Takes 22 Cal. Blank Cartridges obtain &ble everywhere. Great protection pmt burglars, trampa, dogs. Have ying around withont the danger ate tached to other revolvers. Fine for 4th of July, New Year's, stage work, starting pistol, etc. Small size 25c. Medium size '5üc. Large size $1.00. tridges 50c per 100. Holster (cowbo: Shipped by Express only, not prepa! Blank eare type) 50c. ADDRESS ALL ORDERS FOR GOODS ON THIS PAGE TO aie alk sd | CATALOG JOHNSON SMITH & CO. Dept. 540, 6615 E. Jefferson Ave., DETROIT, MICH. LATEST CATALOG copy of our NEW C. . LAS PY, N W CATALOG mailed on receipt of 10c, or the De: tion wi binding 25c. Bigger and better than ever. kind In existence. Near! the newest novelties, puzzles, 600 pages of the latest ames, sporting goods, rubber stamps, unusual and interesting books, curiosities in seeds and plants, etc., unprocurable elsewhere. Stampa Accepted . Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers Our Christmas Special! Electric Train Kit! AnElectric Train for 25c! Com- pletely assembled in a few minutas. Train ia beautifully litho- graphed in several golorg. Fast, it goes faster then most Targe e trains. 5 Neede no tracka or transformers—a big savings. Runs on dry cells, indoors or outdoors. Get two or three of them — they make snappy Xmas presents. Price, complete 250, plus 100 postage and packing. ROCKET SHIPS Step™into ' the ius future with za i Rocket.Ship of E bg ur ownl uck Rogers &nd Flash Gordon use them. Be cen- turies aheadof anybod ourneighbor- ] ood. Several ins kinds: rocket planes, rocket cars or rocket boats. Complete plans ere in book form. Rockets require only abon pen hour to paila from inexpensive mea ob- unable at yonr druggist or chemical aupply company. Will go far at high speeds! Price 10c postpaid. "o" TAP DANCE TO Friends adore it. Besides, tap dancing fs not only invigorating d entertaining but is elao s bealth- giving exercise for mak- ing the llmbe supple and giviog a *'epringy'' feeling of fitness to the whole Body. Promotes slimness na- p ture's way, withoub pille, d dieting. Readers say: benefit. ank you for adding tap Ed dancing to em © =r- PRICE 23 CENTS POSTPAID. ELECTRIC EYE 25c PHOTO-ELECTRIC CELL 4 «»Ph otocell--is one of the latest acl- entific discoveries that has many practical uses. A flash of light opens & garage, window, door, turns lighta on or off, stops or starts a motor, etc. Used in all television sets. ‘The miracle with a millionusaal No experimentor, no inventor (and who isn’t?) should be without this latest scientific novelty. Can aiso be used to amuse and delight people by creating weird ef- fects. Lights wo off, doors bang, witha flash of light. Electric Eye, only 25c posinal . Supersensitive Etectric Eye, better quality, $0 cents postpald. ELECTRIC MOTOR All parte nec- An Electric Motor for 10c. Sounds almost unbeliey- &ble but itis perfectly true. We send ali th parts packed in a neat box, with full instructions for ling. No trouble at all putting 3t together--it is FUN. Tekes but a few minutes, And OH BOY! Isn't it epeedy! Rune on a No. 6 or similar dry battery. You can learn more about à motor in 30 minutes than by hours of study, Perform many novel and interesting experiments with it, Price 10c; postage Sc extra. 143

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A-C-RADIO TELEVISION EVERY ELECTRICAL SUBJECT COVERED Here's great news for anybody interested In Electricity. BRAND NEW edition of Applied Electricity brought right down to date with every NEW Electrical subject fully covered. 10 big Volumes and all shipped FREE for examination. BIG FIELD! Big Demand! i | Men who understand electricity Big Pay! are urgently needed right now in thousands of industries, airplanes, machine shop: ractienly every industry de- pends on electric ty and men who know this sub- ject make big money. Pleasant, fascinating work, For Beginners and Experts over, 3000 pages— undreds of illus- fetes the most otors, power Stations, radios, thing electr: explained eY so anyone can understand them, easy to learn and do; learn quickly with these books. Send coupon for a set for FREE examina- tion and see stor o ees r's consultin: membershlp th ine American Technical Society FREE eis tur Cycloneala of Elec- “That's worth tore Pinar cost 3 books AMERICAN TECHNICAL SOCIETY Dept. E-5320, Drexel at 58th St. Chicago ——— — —Ó — —Ó —À — ee ae ee American Technical Society, Dept, E-5320, Drexel at 58th St., Chicago Send for 10 days' free use, BRAND NEW' 10 volume set of Electrical Engineering. In return for mailing this coupon promptly, send free certificate of membership | in the American Technical Soclely entitling me to full consulting privilege for one year, I will pay the few cents delivery charges on the books, If I wish I may Teturn them, in 10 gavs and owe you nothing, but If T ke eep them I will nd $2.00 afte! days, then $3.00 a month until the special price of. ‘only $29.80 is paid. CMy 2nlnll-lcececnculg2lusllesslimoccege “State ..----.-..-- Tlease attach letter stating age, occupation and name and address of employer and at least one business ran as reference. Pugni SHOP TOOL A faster, more powerful tool— grinda, da, polishes, drille, sande, o N L Y e oh. io tooli in the Shop . 1/4 0 r.p.rn. eee raul d motor $ 50 b — fan cooled, dust E ne. Tool wt. only 26 ozs. uns lete with ie collet chuck, 5 ft. cord. only. SIT. 50 2o poat pald — or gend io mode ay pastmi rre eg ing wi Jee is FREE if you order from this advt. MONEY ACH If not delighted after inspection, THE DUMORE CO,, Dept. 236-E RACINE, WIS. DIESEL POWER A Coming American Industry THE internal-combus- tion engine represents man's supreme triumph of machine power. Diesel engineers are in great demand. Many are acquiring necessary knowledge through spare-time study of this modern I. C. S. Course on Diesel engines, Free bookletl INTERNATIONAL CORRESPONDENCE SCHOOLS BOX 2324-G, SCRANTON, PENNA. Please send information on course checked. [I DIESEL POWER [|] ELECTRICAL ENGINEERING D Mechanical Engineering — [] Automoblle Course OD Air Conditioning Name. Ago, Address. OD Aviation Engines 144 Make These Novelties With Plastics [Continued from page 122] should be taken not to strike the thin edge of the plastic as it is apt to chip. This done, start the lathe and with a straight edge chisel, cut away the surplus lead. Another project is the envelope and paper holder for the writing or business desk. This stationery holder requires two pieces of 1⁄4- inch thick translucent plastic 9 inches long and 4 and 6 inches wide, respectively for the uprights. The rods are 3g-inch in diameter and 4% inches long. The feet are 44-inch square and 1 inch high. After polishing the edges and surfaces of the uprights, they are laid together with the lower edges coinciding and a number of rub- ber bands stretched about them, then the holes for the rods are drilled. Apply cellulose cement to the adjoining surfaces. If desired the holder can be made into the complete unit shown by assembling on a walnut base. “Chinook” a Midget Gas Engine [Continued from page 128] When engine is ready for assembly and test- ing, provide a mounting made of two flat pieces of wood, on which the gas tank is mounted together with the spark coil hooked to a 4-6 volt battery. The fuel is mixed in the proportion of 1 gill of S.A.E 40 per half-pint of aviation gas. A small amount of Pyroil is also good as it will prevent the engine from seizing. A good timing device for such a motor when used in models is the Eastman Kodak Timer which can be mounted directly to actuate a small radio panel switch placed in the primary circuit. The jacket is simple. Turn off the fins, and thread the outside top instead of the inside top. An aluminum collar 3,” thick screws down outside the cylinder on to a brass sleeve, sectioned as per the drawing. Shellac will keep all joints tight. The head is of aluminum, a simple turning for the lathe, and the inside slide fits into the cylinder. The clearance should be 133” from the bottom of the cylinder. Six filister head 2-56 screws, set with liquid gasket material, seal the head down. The water outlets are drilled top and bottom—top for outlet and bottom for intake. BLUEPRINTS FOR CHINOOK ENGINE Enlarged blueprints of all drawings appearing in this article will simplify the task of building this model gasoline engine. They are printed on tough suitable for rough usage in at $1.00 postpaid. Send your order for Chinook, Blueprint No. M-411, to Blueprint Dept, Modern Mechanix Publishing Co., Greenwich, Conn. paper the shop and are available Thank You for Mentioning Modern Mechanix and Inventions Magazine When Writing to Advertisers

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$7529 Less Motor Drive 9"x3' Workshop J BACK-GEARED SCREW-CUTTING PRECISION LATHE

NEW 1936 model 914” x 3’ Workshop Bench Lathe with Horizontal Countershaft, 4 h. ing Motor, Reversing Switch and Belting as shown... (No Down Payment—36 Months to Pay) HE new 1936 model 9-inch Workshop Lathe swings 914” over bed and 514 over carriage. The hole through spindle 8 <4 a ^» is 94" and will accommodate collets up to 12" capacity. The ops 4G, . 3-foot bed size takes 17" between centers. Screw thread ded], Jagen » 805 cutting range is 4 to 40 per inch right or left hand. Turning efor cee C dh de be feeds as fine as .003" are provided for. Other bed lengths Jo. et £ kotiro Ong

available are 314', 4' and 414' at slightly higher prices. 10 New Features of the new 1936 model include: (1) Twin Gear Reverse for Right and Left Hand Threads and Automatic Carriage Feeds, (2) Ball Thrust Bearing on Headstock Spindle, (3) New Improved Tailstock and seven other important improvements. 38 Practical Attachments, many of them new, are furnished for the 1936 Model Workshop for milling, grinding, draw-in collet chuck work, and other manufacturing and machine shop jobs. Especially Recommended for Manufacturing, Laboratory work, Auto Service shops, Electric shops and Home shops for fine, accurate precision jobs in metals of all kinds, woods, plastics and other machinable materials, Used by U. S. Government, Bell Telephone Laboratories, Toledo Scale Manufacturing Co., Sikorsky Aircraft Corp., Firestone Tire and Rubber Co. and scores of other industries. NOTHING DOWN—3 YEARS TO PAY Write for information on how you can Purchase this lathe. Nothing Down--3 Years to Pay. Only 5*5 interest rate, the lowest in the history of easy payment selling. Mail Coupon for Descriptive Literature SOUTH BEND LATHE WORKS 267 East Madison St., South Bend, Ind. U. S. A. SOUTH BEND (Precision LATHES SOUTIL BEND LATHE WORKS, 267 E. Madison St., South Bend, Ind. U.S.A. Please send the following checked below:

O “Workshop” Catalog No. 15-D. (Free.) D Easy Payment Details—No Down Payment. Size of lathe interested in... Class of work.

Thank You for Meutioning Modern Mechaniz and Inventions Magazine When Writing to Advertisers 145

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Now) Wdoas-Chat tan rud This is the newest of the electric fan family. Tough rubber blades direct a powerful flow of air but cannot injure even a child's fingers. It is noiseless and motor dees not heat. A new bit for use in sewing machines uses a jig saw action to cut wood, metal, or stiff fabric. It makes a smooth cut and leaves no sawdust or waste. A master antenna system has been developed for apartment houses and hotels which permits any number of radios to operate from a single aerial. A new resonance indicator employing an electron-eye tube can detect even a 5-megohm load in a circuit under test. It is small and self- contained. A paint can is now available which fits connec- tions on the spray gun. No paint is wasted when changing colors as one can of paint can be sub- stituted for another. A mechanical car parker lifts cars with special grips and hoists them to any upper level stall. Dust cloths are now made of a special crinkled cloth which pro- vides large wiping surfaces and pock- ets to hold the dust. Gas powered model airplanes This new reel has a special bait — 97€ DOW being built casting adjustment feature. A to scale of famous thumb dial is set to the weight of airplanes. They the lure and reel brakes accord- No thumbing is necessary. are crashproof. ingly. 146 A telephone holder for French phones swings in any direction and holds the phone in any position, leav- ing both hands free. A five-watt ampli- fier for use on Phonograph pick- ups and radio tuners has a high output level with- out hum. Trailer brakes can be adjusted according to the load weight with A new clutch for this simple dashboard control. outboard and in- board motors provides forward and reverse gears as well as a neutral position. It is easily installed. Bank checks are now used as advertising mediums as the result of a new printing method. Pictorial records show the firm’s activities without interfering with the check’s safety fea- tures. ` A rug dye which can be applied to any rug with scrub brush or spray gun will not fade in the strongest sun. It i can be applied to the rugs right on the floor. A small are welder quickly handles small jobs in the home workshop, service shop or metal shop. Artificial light for greenhouse grow- ers not only sup- plies all the light needed for grow- ing plants but also provides all the necessary heat. With both electrodes on one side of the work, this machine makes perfect welds at both electrodes. Editors 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 Mecuanrx AND INVENTIONS, Information Bureau, Fawcett Building, Green- wich, Connecticut. Manufacturers are invited to submit material.

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FACTORY TO YOU. NEW REMINGTON NOISELESS PORTABLE i's A DAY AT LAST! The famous Reming- ton Noiseless Portable that speaks in a whisper is available for only 10¢a day. Here is your opportu- nity to get areal Remington Noise- less Portable direct from the fac- tory. Equipped with all attachments that make for complete writing equipment. Standard key- board. Automatic ribbon reverse. Variable line spacer and all the conveniences of the finest portable ever built. PLUS the NOISELESS feature. Act now while this special opportunity holds good. Send coupon TODAY for details. YOU DON’T RISK A PENNY We send you the Remington Noiseless Portable direct from the factory with 10 days’ FREE trial. If you are not satisfied, send it back. WE PAY ALL SHIPPING CHARGES. FREE = TYPING COURSE With your New Remington Noiseless Portable we will send you—absolutely FREE—a 19~page course in typing. It teaches the Touch System, used by all expert typists, [tis simply written and completely illustrated. Instructions are as simple as, A, B, C. Even a child can easily understand this method. A little study and the average person, child or adult becomes fascinated. Follow this course during the 10-Day Trial Period we give you with your typewriter and you will wonder why you ever took the trouble to write letters by hand. FREE = CARRYING CASE Also under this new Purchase Plan we willsend you FREE with every Reming- ton Noiseless Portable a special carry- ing case sturdily built of 3-ply wood. E This handsome case is covered with heavy du Pont fabric. The topis removed by one motion, leaving the machine firmly attached to the base, This makes it easy to use your Reming- ton anywhere—-on knees, in chairs, on trains. Don't delay... send ia the coupon for complete details! CLIP COUPON NOW,.. The gem of all portables. Im- agine a machine that speaks ina whisper... that removes all limitations of time or place. You can write in a li- brary, asick room, a Pullman berth without the slightest fear of disturbing others. And in addition to quiet is a superb performance that lit- erally makes the words seem SPECIFICATIONS, Stand- ard Keyboard. Finished in glis- tening black with chromium attachments. Takes paper 9.5 inches wide. Writes lines 8.2 inches wide, Standard size, 12 yard ribbon. Makes up to 7 clear, legible carbons, Back spacer. Full size platen. Paper fingers, MONEY-MAKING OPPORTUNITIES OPEN. of jobs are waiting for people who can type. A typewriter helps you put your ideas on paper in logical, impressive form...helps you write clear, understandable sales reports, letters, articles, stories. A Remington Portable has started many a young man and woman on the road to success. A GIFT FOR ALL THE FAMILY. GREATEST TYPEWRITER BARGAIN IN 10 YEARS - MONEY BACK GUARANTEE '10-DAY FREE TRIAL OFFER to flow from the machine. Equipped with all attach- ments thatmakefor complete writing equipment, the Rem- ington Noiseless Portable produces manifolding and stencil cutting of truly ex- ceptional character. Fur- nished in black with shining chromium attachments. Mail coupon today! roller type. Black key cards with white letters, Double shift key and shift lock. Right and left carriage release. Right and left eylinder knobs. Large cushion rubber feet. Single or double space adjustment. All the mod- ern features plus NOISELESS operation, Hundreds If you want a gift for birthday or Graduation... one Father, Mother, Sister or Brother will use and appreciate for ears tocome.... give a Remington Noise- ess Portable. We will send a Remington Noiseless Portable to anyone you name, and you can still pay for, it at only 10e à ifts are so universally pleasing emington Noiseless Portable. day. Few as a New Write today. SEND COUPON WHILE LOW PRICES HOLD Remington Rand Inc., Dept. 141-5 205 E. 42nd Street, New York, N. Y. Please tell me how I can get a new Remington Noiseless Portable typewriter, plus FREE me, without obligation, Name. Typing Course and Carrying Case, for only 10c a day. Also send new illustrated catalogue, Address, City —— —— — —State.

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OUT OF LUCK! THE ONLY TIRE THAT GIVES YOU GOLDEN PLY BLOW-OUT PROTECTION Child; pointing: “Look, mam- ma, the frontis all smashed up.” Mother: ‘Yes, it was a blow- out. They’re lucky they didn’t go through the railing.” * * * i Here's how the amazing Good- rich invention— the Golden Ply —saves lives. Át speeds of 40, 50, 60 miles an hour terrific heat is generated zuside the tire. Rubber and fabric begin to sep- arate, A tiny blister forms. You don’t know it—you can’t see it —you drive on. Bigger and BIGGER it grows until —sooner or later—BANG! A blow-out! By resisting internal tire heat the Golden Ply —found oz/y in Goodrich Silvertowns —keeps rubber and fabric from sepa- rating. Blisters don't form in- side the tire, and when you * prevent the blister you prevent . the high-speed blow-out. When the tires on your car can easily mean the difference between life and death, don't you want this real blow-out protection and the months of extra mileage and greater rid- ing comfort that Silvertowns will give you? And when you stop to think that Silvertowns cost not a penny more than other standard tires, isn’t it fool- ish to gamble on tires? See your Goodrich dealer now. HEAT CAUSES BLOW-OUTS. PREVENT THOSE BLOW-OUTS WITH THIS HEAT-RESISTING GOLDEN PLY FREE Į Join the Silvertown * 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. gw Goodrich SAFETY Silvertown With Life-Saver Golden Ply Blow-Out Protection Printed in T: S. A.

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X CASH- SI, 000.00 CONTES, - 183 PRIZE s MECH ANI V. NSC SEE PAGE 73 H. G. Wells Photographs the Future in. His Amazing. Motion Picture "Things to Come" radi

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Double Page Spreads

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INVENTORS O BE succi as an in- entor, you don't need to be out 1099 You may be able to do as well as others who have been successful, That ean tell. B Interesting an Edison who tc € aL sp Patents he died, ora C F Points dom Kettering, who helped de" Self-Starter, Duco, ether outstanding) in nous head of the General ct, you contest, ill, holte 939 P E ier Mme aa "ical, useful, an idea for right. Remember or Kettering, for every mick, DeForest or At there have been thousand known men whose inventions heiped along the wheels of prog- ress and helped the inventors fi- nancially at the same time. of un- Many Little Ideas Have Big Commercial Possibilities A New Book About Selling Inventions ted ar Patent ADP TAIS can be made total or Patent Applied For. eae 10 ine Whew Writ You may not be an * Edison or a Kettering í still you may have * good idea YOUR QUESTIONS ANSWERED! tions that the avera: ere area Should I try to sell * dot oi ques- it Patented? Is there any safe, b man with an invention, to secure Gnancial help? If I do appl invention before I have siness-like for a idea for one tent how shall I reach people who ca ead. Here are a few of them most ket my invention? Can I protect and tors put up to us: How do the Patent ‘ovement on some invention tha e? W sy steps can I ady been Patented? These are but a íew to put mysel sition to sup- the questions which usually ront t »eliet t y invention. to think rth the cost? age man, You need the answers! YOU HAVE THEM, without cost, trouble, or delay. Our Business is To Help You—Write Us Today his firm bas sr ol mind. experienced Sncciniisly, Registered Patent” Attorneys: Ds men, and Searchers to help on clients zecur protection to which they are entitled, jonabe, Deferred payments frequently Tüe us fronidy Oat the coup VICTOR VANS & Co. Ey RECISTERED PATENT ATTORNEYS MAIN OFFICE: 720-E, VICTOR BUILDING, WASHINGTON, D. C. iso. Mc 3079 epson terti Milo Hout Miles pou "sd Probe and "AV it ipid by any © Hires iile Street and No. - Thank Yon for X ng Modern Mechanir aud Inventions Magazine Wh u

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ETE [um JP ATE NTE Es TO OBTAIN A : to Question on Page 1 JB patenting the invention. SD Send sketch or model and de- scription with search fee to a tered patent attorney. 1101 U. S.-1279 Foreign. Abraham Lincoln. lı confers on patentee the ex- ve right to make, sell and invention covered by the sketch und de- properly filled ary evidence Because a layman or a lawyer in general practice is not learned in patent office practice. receipt received. CLARENCE A. O'BRIEN and Hyman Berman 317-F Adams Building Washington, D. C. U. S. Paten! Registered Attorneys Before U. S. Oti. ven nt k. (Copsrizht Cha: what to do to protect y KNOW HOW to START KNOW EACH STEP to TAKE Before Going Too Far With Your Ideas Y without further de teps, and go t procedure depends upon the first-step Immediate Search an e: original hat you hi ble upon an existing inv been anti Record of Invention Blank in a manner of value ia yo Eiminer, NATL TH i Bet e CLAREN CE A.0* BRIEN RERA £ Hyman Berman 317-F Adams Building WASHINGTON, Bike FREE, ROOK, “y std "Record of {Ngaio on my pari ADDRESS isset UTR ue pst nome pias

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Contr Chat tony ig OATS, boats, boats and more boats. The spring rains are certainly turning MM's Workshop fans into boat builders and it looks like this summer will find hundreds of our readers out on the lakes and rivers in their own craft. Our recent edition of How To Build 20 Boats is going fast. Now is the time to get your copy (it’s 50 cents) and get started on a practical boat for summer cruising, sail- ing or fishing. Or if you wish, you can get a copy of MM’s free Blueprint Catalog, which contains descriptions of a whole assortment of boats, from 7-foot Tar Baby to the 30-foot ocean cruiser Tahiti, more than 40 boats in all. dena We were down to see the eighth annual ex- hibition of the New York Society of Model Engineers recently and one of the first things we saw was a model of our Tiny Tom, the OO gauge pencil-length locomotive which ap- peared in our November, December and January issues as well as in our 1936 How-To-Build-It Book. We lost. no time in getting in touch with its maker, William Pinter of Garwood, N. J. We asked him why he happened to build Tiny Tom and he answered with this letter and photograph to win our first prize of $5: Garwood, N. J. Dear Editor: Here is the story of how I happened to build your Tiny Tom. I read several model-making magazines, but I never thought of Modern Here is "Tiny Tom", MM's pencil length locomotive, in all. his glory at the New York Model Engineers exhibit recently. "Tiny Tom" and his maker, William Pinter, steam off with first prize of $5 this month, Note detail of this perfect model. 20 Mechanix until, in November, 1935, a fellow model maker presented me with a copy of your publication. I liked the way you detailed your drawings of models, which, by the way, I do not find in other magazines. As these drawings make it very simple and easy for anyone with- out experience to construct any of your models, and as I was especially taken with the model of Tiny Tom, I decided to build this small loco- motive in my spare time. I did not use any castings in the model, all parts being made by me by hand, turned off a lathe. The drive wheels were built up of brass and, in fact, brass and sheet zinc was used throughout the whole model. Zinc is very nice to worl with in model work, it being easy to form and it makes a very neat soldering job. For power I used a miniature 6-volt motor which I purchased severa years ago. I have been building models for some years in O gauge but this being much too large for an indoor layout, I decided to switch to OO gauge. I would appreciate it very much if you would publish more rolling stock and track layouts in your valuable magazine, preferably to scale. I am sure that not only myself but many of your readers would be glad to see this information in your periodical. William Pinter. It is letters like that that gladden the heart of any editor. As for the plans for rolling stock and track layouts that Mr. Pinter asks about, we knew those requests would come pouring in and so in our April issue we put in plans for everything, from flat car to caboose. ae Our second prize letter and photograph was sent in by Gene Caswell of Miami, Fla., who did some fast work on building the record breaking model plane which appeared in our March issue. You all know, of course, that each month we award three prizes for the best. letters and photographs sent in to the Editor's Workbench. First prize is $5, second prize is $3, and third prize is $2. Speaking of prizes, don't overlook our big $1,000 cash contest which tests your knowledge of cars. Details appear on page 48. Gene's letter follows: Miami, Fla. Dear Editor: I have enclosed a snapshot of the model Modern Mechanix & Inventions plane I built from the plans that ap- peared in the March issue of MM. The ship per- formed fine on its trial flights. I tried to obtain an action picture of the plane but it was too fast for me. I enjoy every page of your maga- zine including the ads, and, of course, especially anything about aviation and model building as I am a model fan. "Too fast for the camere plane, and so her build Gene Caswell. n Because of the good job George V. Piver of Beaufort, N. C., did in building Nomad, one of the boats whose plans are published in our recent edition of How To Build 20 Boats, we are awarding him the third prize this month. You can see why when you read his letter, which follows: Beaufort, N. C. Dear Editor: I am sending you some snapshots of my Nomad which I built last fall. She was de- signed for inland waters but has proven sea- worthy. I have used her for trolling for blue fish at Beaufort Inlet and she is more seaworthy than some of the larger boats here. So far I have raced seven boats and beaten them all, and I haven't much sail, as you can see by the photo. J have had 1,290 pounds in her and had plenty of room to spare. Iam building a camp trailer now and will send a photo soon. I never miss a copy of your magazine. Let us have some more boat plans. George V. Piver. As long as we are on the sub- ject of boats, we might mention that the boating bureau of the Outboard Motors Corporation of Milwaukee, Wis., has com- piled a list of 188 outboard boat builders in all parts of the Magazine, May, 1936 Workboncl standing still to win second prize. He built her from plans appearing in the March MM and finds her the real thing. "She is more seaworthy than some larger boats here,” writes George Piver in describing his Nomad. His boat won 3rd prize of $2. country. Just drop them a line and you will get the list free. eee Dr. Paul W. Bemis of Everett, Mass, states in a letter: "I have a very beautiful ing model ^ workshop with s Gere Caswell, photographed her NOS in- vested and work in metal and wood. I enjoy your publication and have been a reader from almost its inception.” What is your shop worth? C. E. Dawe of Spokane, Wash., describes his shop as follows: "I have a wood working shop, lathe, jig saw, jointer, and circular saw, and use it as a hobby, as I like nothing better than to be sawing or working with wood, I buy MM each month from the newsstand and get lots of ideas and enjoyment out of it.” von Bert Tucker, 184 Coogee Bay Road, Coogee, Sydney, Australia, would like to exchange ideas and news with MM readers anywhere. Here's a good opportunity for stamp collectors. s" Richard Verreault of Buffalo tells us that in addition to Charles Wittholz the boat, pic- tured in How to Build 20 Boats in connection with Sam Rabl’s article on ~~~ Sunray, was built by Paul J. Fries and himself under the supervision of George T. Verreault. "The use of Mr. Verreault’s shop was one of the main factors in the successful completion of the boat. aoe "In the June, 1935, MM I built your shortwave two-tube receiver, writes Romeo Bar- talo of East Boston, Mass, "I logged ten South American [Continued on page 22] 21

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Airplanes which rise and descend vertically are seen in "Things To Come." Here again Wells limits himself to improving things already proven practical, combining helicopters, auto-gyros and dirigibles in a single unit. genius of our day. With other miracles of the year 2054, they will soon be seen in Mr. Wells’ startling motion picture, prophetically entitled “Things to Come.” Not the least convincing fact about Mr. Wells’ vision of the future is the clean-cut way in which he eliminates what he calls scientific “balderdash.” Tomorrow’s world will be a triumph of. science and the machine, to be sure. But there will be no robot men; machines will not rise like Frankensteins to slay their creators. Such fantastic touches as these often adorn the prophecies of less able scientists than H. G. Wells. But in "Things to Come" we have painted for us an astonishing picture in which there is not a single development which does not follow naturally out of labora- : Mastery of Machines ls s Je LM a es tory discoveries of our own day. It is in- spiring for us folk of 1936 to realize that the progress of science, as presented each month in the pages of MODERN MECHANIX & INVEN- TIONS, is laying the foundation for a new civilization. “Things to Come” begins in 1940, only four years away. Without warning, bombing planes appear suddenly over the city of Everytown, symbolic of every other city in the world. It is Christmas Eve. Out of the black night comes the soul-shattering terror of the bombs, rending skyscrapers to kin- dling, blowing people to atoms. Deadly new gases sweep through the ruined city, choking out the lives of men and women and children, proving that there will be no non-combatants in the next war. Frightful as the dramatized bombing ap- pears, it is no exaggeration. Since the last aerial bombing on a large scale in 1918, an amazing increase in efficiency has been demonstrated by the fighting planes of the world. The destruction wrought by Zeppe- lins and bombers during the World War was trivial when contrasted with the tremendous destructive power of modern air forces. Despite almost complete destruction, Everytown hurls every fiber of its strength against the enemy. Soon there comes a new horror—the shells of the enemy spread the germs of a strange disease, the Wandering Sickness. People stricken by it wander blindly for hours until they die. Water and Key to Man’s Survival Left—This underground apartment in the future: city of Everytown was made of chemicals poured into moulds just as prefabricated houses are being built today as shown in circle. In this telescope at Everytown scientists watch the space ship fly to the moon. The new Mt. Wilson 200-inch tele- scope at right would be able to follow such flights with ease. food supplies are contaminated. Doctors can devise no cure for it, for all laboratories, all means of research have been destroyed. This weird disease could be similar in form to the invisible plant disease virus which Dr. W. M. Stanley of the Rockefeller Institute for Medical Research succeeded in crystallizing recently. A few crystals of this substance dissolved in the city water supply would leave scarcely a resident alive. By 1970 the endless warfare has reduced the world to a state of barbarism. Nations have ceased to exist. In their place are communities like Everytown, domi- nated by local war-lords fighting with their neighbors. The people of Everytown live under the thumb of The Boss. In this desolate scene of havoe a miracle occurs one day. A strange airplane with queer, swallow-like wings descends in Everytown. The pilot is John Cabal, an aviator who lived in Everytown before the war, The Boss eagerly demands to know if he can buy planes and gasoline to fight to a “vic- torious peace,” but Cabal shakes his head. His government helps no one to wage war. The Boss angrily orders him thrown into a cell, where, some hours later, Richard Gor- An interior view of the space ship, looking down upon the two passengers who are to journey to the moon. Note the manner in which they ate suspended to absorb the first shock. Today's Progress Paves Way to Future Wonders don finds him. Gordon is an old friend of Cabal’s, and with the latter's directions Gor- don gets gasoline from Cabal's plane, patches an old ship and manages to escape to Basra. The throb of powerful motors heralds Gor- don's return with a squadron of bombing planes. The Boss is terrified, but he has a hostage! He ties Cabal in the middle of the square where the invaders must see him. In spite of this, the bombs begin to fall. They thud to earth and burst with harmless “‘plops,” but nothing seems to happen. Then, slowly, the Boss and his soldiers and all the citizens of Everytown fall asleep. For the bombs of the airmen are not designed to kill. They re- lease the gas of Peace, a powerful anesthetic. Thus, in 1970, the soldiers of science begin to build the world anew. And what a world! We see it next in 2054. An age of enormous mechanical and industrial energy has fol- lowed world peace. Flying over the new

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Above—Oswald new game, Politi evenings with Lord, standing, supervises the play of his Thousands of people are spending their game, in an attempt to become President. MERICA likes to play. Whether they know it or not, millions of otherwise rational Americans are forever waiting to be caught in the craze for a new puzzle, a new diversion, a new game. The very word “game” sounds trivial, but it isn’t. Games have a powerful influence on the social life of the world, and—games are the delight and the despair of the men who invent them, America likes to play, and is willing to pay for its fun. Right now it is playing a new game called Monopoly. Already the fastest- selling non-card pastime in the country, Monopoly bids fair to break all-time popu- larity records. Like parcheesi, Monopoly is played by shaking dice and moving tokens around a spaced board. But there the similarity ends. The Monopoly player is furnished at the outset with a handful of script money. When his dice land him in an unoccupied "street" he may purchase holdings there, and may levy rent from any other player unfortunate enough to fall in his domain. If he is clever he may acquire hotels, utilities and railroads. The ultimate object, of course, is to maneuver assets so cunningly that all other players are left bankrupt, with the winner holding all. The spendthrift player who manages his 40 America has an in- satiable appetite for games, but it is subject to whims, Feeding this ap- petite is a game itself, and one never knows which way to jump. Out of the East came Mah Jongg to captivate the public for a season, It proved too technical, however, and was lost. finances poorly finds himself utterly ruined. Monopoly, though it has taken hold only during the past year, has more than three decades of history behind it. In 1904 a young woman of Virginia named Mrs. Elizabeth Magie Phillips devised a game which she called “Landlord.” Her motive was not to make money, nor primarily to furnish amuse- ment. “I conceived the game of Landlord to in- terest people in the single-tax plan of the great economist, Henry George,” said Mrs. Phillips recently. The game continued to be played in a small Modern Mechanix & Inventions Following close upon the heels of Mah Jongg as a parlor pastime came Backgammon. This is not new, having been played in England for centuries. It is still popular. way, and in 1924 Mrs. Phillips patented a variation on it which she called "The Land- lord's Game." This version later fell into the hands of ‘Charles B. Darrow, of Philadelphia. Darrow revised the game and patented it. In 1931 he sold a few sets to friends, and finally interested a large Philadelphia department store in the idea. Parker Brothers, of Salem, Massachusetts, Magazine, May, 1936 More than 30 years ago Mrs. E. M. Phillips, above, devised a game called L 'd to interest people in a single tax plan. "This game grew into Monopoly, another sensation of the Left—Not even the army escapes America's craving for games. In this game, called Battle, armies are moved over the board to strategic positions in an effort to wipe out the foe. Railroads, highways and airplanes add to the complications. foremost manufacturers of games in the country, at first rejected Monopoly because in their opinion it required too many parts and took too long to play—three hours or more. By spring, however, the game attained such popularity that the Salem firm bought it under the patents of both Mrs. Phillips and Mr. Darrow. While Monopoly was beginning its amazing rise, Oswald B. Lord, a young textile execu- tive in New York City, set his agile mind to devising a game with a new twist. “Games have always been something of a hobby with me,” he said. “But it struck me that most new games were not really new at all, but were merely variations on old favorites like parcheesi, chess and checkers.” Oddly enough, it was while taking a hot shower that Mr. Lord pounced on a subject that offered excellent possibilities for a game. Politics! What with a presidential campaign [Continued on page 134] 41

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The aerial rapid action casaera, known press the shutter, adh THE STORY OF High above the broken floor of the Rio Grande River basin, an airplane gtowls monotonously over 32,000 square miles, each click of its Cyclopean camera bringing nearer to completion the largest photographic mapping project ever undertaken in the United States. odern fying mate of the well- asily a finger can trip or wind vance fresh flm and aim it for more exposures. ‘Thus the camera becomes an integral part of the photographer, who operates’ it with the same ease as he does his automobile. ; XACTING and tedious is the scientific job of gathering up 32,000 square miles and literally pasting them in your hat. Only one man is utterly capable and he is the fellow who supervises the shooting and assembling of this vast mosaic. He is the 39-year-old president of the Fairchild Aviation Company—Sherman M. Fairchild. The planes are his, the cameras are his and the science of aerial mapping grew from the two decades of study he put into air photography. It isn't easy even now, this business of sweeping up miles and not losing a single detour. And it wasn't easy back in 1918, when Fairchild tried to interest U. S. Army officials in his new and revolutionary type of aerial camera, for he met with polite indif- ference and downright skepticism. But today he is world famous as the man who made sky mapping a big business. His latest invention, a $26,000 ten-lens camera, will photograph in one operation a ground area twice the size of New York City. Fairchild’s interest in photography began while he was still in college. After the army had rejected his new type of aerial camera, he went to work in the engineering department 44 of the Eastman Kodak Company. Then, again in 1922, he tackled army officials once more, this time persuading them to purchase twenty of his new cameras for $1,800 apiece. Two years later found him organizing an aerial magazine and newspaper photograph- ing service, with two planes from Huff- Daland & Company and representing them exclusively in the field of photography planes. But no clients appeared. Just when he was ready to give up an order came from the Brazilian Government for two machines. Jubilant, he informed his sponsors, only to learn with dismay that his agericy contract had expired three days previously. This news was a bitter pill to swallow but young Fair- child got out of that predicament by cabling Brazil that his present planes were "unsatis- factory" and that newer and better ships had just been developed. Brazilian officials took him at his word and ordered two. At that time one of the greatest airplane designers, Igor Sikorsky, was at Roosevelt Field—loafing. Fairchild hired him on the spot. Sikorsky jumped at the chance—his first job in America since he came over from Russia as a refugee. And the contract with Brazil was fulfilled successfully. A Fairchild Modern Mechanix & Inventions He Made Sky Mapping a Big Business SHERMAN M. FAIRCHILD AND HIS AERIAL CAMERA A. specially built dolly cradles the nine-lens camera designed for Coast and Geodetic Survey. Front and rear compartments safeguard accessories. cabin monoplane is now a common sight, and this company ranks among the leaders in American private plane production. The corporation has four subsidiaries, manu- factures 75 per cent of the world’s aerial cameras and owns the largest aerial picture library in, existence—in fact, the entire world, Magazine, May, 1936 by Sherman M. Fai hild and his nine-lens single unit camera. |The diagram (upper left) is that of the negative, under which is the print. The watch, negative number, reference marks, [evel and data card’ are photographed simultaneously with the remarkable nine-view picture. Already referred to is Fairchild’s latest survey—the Rio Grande project. This is the third consecutive job his organization has undertaken for Uncle Sam. ‘The first two were the aerial mapping of Boulder Dam and 25,000 square miles of watershed in the Indian Reservations of Arizona, New Mexico and Utah. All these jobs, which take in more than 84,000 square miles of terriotory, are part of the government's program for soil conserva- tion. From the completed maps, experts will be able to plan the control of this vital prob- lem and, in the case of Boulder Dam, will be able to determine in advance the number of auxiliary dams needed to control the silt now being washed into the reservoir from the various tributaries. Preparing an aerial map involves a tre- mendous amount of detailed work, work 45

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Do YOU Know C ARS? VERY day you witness or participate in the parade of 1936 automobiles. You see new cars on every hand, but do you recognize the cars you meet? If you do, you have a good chance to win one of the 183 cash prizes in this big $1,000.00 contest. In this installment, the second of a series of three, there are printed the identifying fea- tures of four popular automobiles. All you have to do is write in the alloted space the name of the car from which the identifying feature was taken. Less than 30 years ago it was possible to recognize your neighbors team of horses a half mile away simply by their gait. Whether or not this ability to identify familiar objects has been passed on to the auto-driving gen- eration is the question that brought about this unique contest. : After identifying the cars, the next step is to write a ten-word safety slogan, something straight to the point which may be instru- mental in saving hundreds of lives. This slogan can be on any phase of motor- ing safety which will awaken the driver or pedestrian to his or her responsibility. The first installment of the contest appeared in the April issue, and the third will appear next month. Study the rules carefully, and write your safety slogan while waiting for the last four photos next month. THE QUESTIONS ANSWER THESE QUESTIONS 1. What is your age and occupation? 2, Do you own an automobile?...................... What make? .................. What year? ............ 3. Do you plan to buy a new car?............... When?................... What make?...... sss. 4. Approximately how many miles do you travel in your car annually?........................ 5. What brand gasoline do you regularly DUV cute es at oil? SEER What tires? S nee nh deeem tier ' EDITOR, Modern Mechanix Publishing Company, THE RULES . Cut out each photograph and in the space below it write the name of the car from which the identifying feature was taken. DO NOT MAIL YOUR ENTRY UNTIL ALL IEEE PHOTOGRAPHS HAVE BEEN PUB- Answer accompanying questions. Your replies to these questions will not be considered by the judges, but to be eligible each entrant MUST answer the questions. In ten words or less state your "SAFETY SLOGAN." The originality shown in the "SAFETY SLOGAN" WILL BE CONSIDERED by the judges. The "Safety Slogans” are to become the sole property of Modern Mechanix Publishing Co. This contest is open to everyone except employes of Modern Mechanix Publishing Co. You don’t have to buy a copy of this magazine or be a subscriber to enter this contest. Recognizable facsimiles of the photographs will be acceptable. Contestants need not submit elaborate entries. Neat- ness, brevity, and accuracy will be the deciding factors. No entries will be returned. The editors of this magazine will be the judges. Their decisions are final. In case of ties duplicate prizes will be awarded. Mail your entry to the AUTOMOBILE CONTEST Greenwich, Conn. Write your name and address clearly on your entry. 'To be eligible entries must be postmarked on or before June 1, 1936. Winners will be announced as soon as possible after the close of the contest. THE PRIZES FirstPrize — — $250.00 IN CASH Second Prize .. ... 150.00 IN CASH Third Prize ....... ... 100.00 IN CASH 5 Fourth Prizes .... wv. 25.00 EACH 10 Fifth Prizes .............. 10.00 EACH 15 Sixth Prizes ................. 5.00 EACH 50 Seventh Prizes ............ 2.00 EACH - 100 Eighth Prizes .............. 1.00 EACH TOTAL—183 $1,000.00 PRIZES ................ IN CASH The Name of This Car Is $1000.00 CONTEST!

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DOCKING the Normandie With Leaving her pier stern first, tugs push a ship back in a great arc, until finally she is headed downstream. WE WERE off to keep an appointment with a 79,290-ton visitor from across the seas—the giant French liner Normandie. Captain Anton Huseby, master of the tug, Alice M., and the man who was to assume the responsibility of docking the Normandie at her Hudson River pier, stood alongside me. Realizing that the captain would soon be too busy to answer my questions, I took the opportunity to ask, “Do you find it more diffi- cult to dock the Normandie than the other passenger ships that come into New York?” He smiled. “Believe it or not,” he replied, “but the Normandie, for all her size and power, is one of the easiest ships I've handled in the twenty years I've been in the business. Last timé she came in we docked her in twenty minutes—fast time for any vessel. "But docking an ocean liner, or for that matter any ship, can never be done on schedule. It all depends on the tides, the con- dition of the weather, the amount of harbor traffic and the season of the year. No two jobs are the same. Given a nice summer day, 52 At Quarantine, the tug-fleet’s captain transfer to the ship's bridge—to supervise the docking. Swinging the Europa into her dock requites the work of ten tugs, three of them (above) are working against her bow. a flood tide and no wind, a ship can be docked in record time. On the other hand, it can be pretty tough if you run into a northwest gale in the middle of winter, an adverse tide and a river packed hard with ice. Night work is difficult, too. Distances are deceiving then and sometimes we're bothered by the glare from the lights on the pier." "Then," I said, "there's reall no set formula for docking a ship." "No. Conditions change daily and the only reason we seldom have an accident—is Modern Mechanix & Inventions New York's TUG The Normandie, for all her great size and power, is one of the easiest of the big ships to handle, claims Anton Huseby, Norwegian captain of the Moran Fleet of New York Harbor tugboats, and the man responsible for docking this great liner. Last time he berthed her in 20 minutes —fast work on any vessel, Carefully guarded from dense river traffic by her convoy of harbor ants, the sea queen steams up the Hudson to her pier. because we always anticipate trouble. We know from experience exactly what to ex- pect. “See this police whistle? Well, I use this to signal my directions to the tugs. They acknowledge each signal with blasts from their own whistles—that's why you always hear a chorus of tugboat whistles when a ship is coming in. They all mean something. For instance, one blast means ahead; another single blast, stop; two blasts, reverse engines, and three or four quick blasts, push in and give her all you've got! We'll have eight tugs on today's job." Magazine, May, 1936 FLEET by JAMES DYSON Comes the cry of “All ashore.” the moored tugs get ready for action ; i the photo shown above. “How do you determine the number of tugs?” I inquired. “There again it depends on the conditions,” he answered. “When the Normandie first came over we used twelve boats, but I've docked her with only six. We usually use ten tugs for the Majestic, Berengaria, Bremen and Europa and about eight for the Aquitania and other ships of her size. But I can remember one tough day in the middle of winter when we had fourteen tugs on the Bremen and it took three hours to dock her. All this was explained to me as we moved along towards the French Line pier. The Normandie had by this time cleared Quaran- [Continued on page 120] 53

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When Hollywood STARS To Nelson Eddy, Marie there is no HILE their images are engaged in en- tertaining millions of people in theaters all over the world, Hollywood stars can be found entertaining themselves—in their workshops. And while their images flash across the screen, garbed in sophisticated evening apparel, gay costumes of former periods, or flashy uniforms, the stars are hard at work in grease stained coveralls, dungarees and sweat shirts, or the first old garments to come to hand. Hobbies in Hollywood are not a fad, They represent years of study and hard work, and when an actor speaks of his particular in- terest, he speaks with authority. Contrary to popular belief, the lure of the night clubs and bright spots is dwarfed by the compelling in- terest the stars show in their hobbies. Wallace Beery is the most famous flier in Hollywood. When not before the cameras he is either up in his six-passenger Bellanca plane testing out new devices, or poring over maps and technical literature on flying at his airport. After aviation comes fishing, and then amateur photography. 56 g star of Naughty Marietta and Rose is ‘stery in sound reproduction, for he has made chat science his hobby. His home laboratory is filled with sound apparatus with which he is always experimenting. Above—One of the bestequipped and the most used work shops is owned by Warren William, Warner First National star. In addition he is an ama- ture inventor and crack sailor. Right—Wander- lure TL, a 40-Foot schooner, occupies the spare time of Henry Wilcoxon, star of The Crusades, since he made navigation his chief hobby. Nelson Eddy’s hobby is also part of his vocation. He studies voice recordings in his home laboratory, which is equipped with the latest sound apparatus. He uses his own voice and those of his friends to carry on a scientific study of sound reproduction, with the result that he is one of the few singing stars to take full advantage of the micro- phone. Also outstanding in this group of mechanically-minded screen stars is Modern Mechanix & Inventions By HOWARD SHARPE TURN 7» HOBBIES Most of Hollywood's actresses are experts in rating, but Maureen O'Sullivan er modeling hobby to make her own objects of art. She is an expert in clay figures. built by Hale and Merrill Hard, partners in an experimental and research laboratory. The instrument so simplifies the study of astrological bodies that a twelve-year-old boy, after four half-hour lessons, is enabled to pass a "Teacher's Normal" examination which usually requires four years of study. Hale's perfected "Aerobot" is capable of controling the plane's speed, altitude and flight direction while the pilot devotes his time to charting or listening to the radio. Many of the Hollywood great have turned to boats for their hobbies, Warren William considers it no great accomplishment to handle his 30-foot sloop, Common Sense single handed in a strong wind. Henry Wilcoxon is another to prefer the graceful close-to-the- water sweep of a sail-boat, while “Tarzan” Weissmuller has a 48-foot yacht powered by two Diesel motors. Even Sir Guy Standing, whose real mechanical hobby is an automo- bile trailer, occasionally finds time to tinker with the engine of his small motor-boat. Sir Guy’s trailer is roomy with a door built into the side, and contains all the requisite [Continued on page 122] Above — Clark Gable, hero of « Alan Hale, whose flair is for things scientific. Of his many inventions three are deserving of mention because of their value to the modern world: His new “Tellurian,” his perfected “Aerobot,” and his im- proved eye-glasses. The "Tellurian" was conceived by Sir Isaac Newton a century ago, in the hope it would demonstrate the effect of various planets upon life and conditions on the earth. It wes finally Magazine, May, 1936

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EFORE a crowded gallery, Los Angeles policemen were demonstrating their skill at revolver shooting. One officer lit a cigarette and turned side- ways. The other, having paced off the right distance, took steady aim and shot the ciga- rette in half. The audience was loud in its applause. But one spectator was heard to say, “Aw, that trick-shooting cop has just seen the Annie Oakley movie, and now he is playing hero.” “Trick-shooting cop?” Well, maybe. Every police officer in America has dreams of becoming a second Billy-the-Kid. Still, had the caustic gentleman making this remark, been at a certain downtown street intersec- tion recently, he would have been pretty much ashamed of himself. For a “trick-shooting cop” was directing traffic there when it happened. 60 y STERLING GLEASON The radio police officer is new expertly trained to snap-shooting at fleeing targets from emergency positions. The six-gun man of the old West this deadly technique, acti dead shot regardless of the target. A screaming motorcycle siren brought the traffic officer to attention. A recklessly driven sedan was hurtling towards him, behind which rocketed the motorcycle officer pouring in lead and receiving a deadly barrage in return. The traffic officer, trained for just such an emergency, shot the driver squarely through the heart as the car flashed by him. But a burst of death from inside the car toppled that “trick-shooting cop” to the pavement, fatally wounded. The driverless car swerved and crashed, and then there was'a gun battle Up from the pits (left) jump police targets, and the officers. pour in their fire. How surely shots are placed is shown in the photo at right, Modern Mechanix & Inventions the Guns of Gangland It was Billy-the-Kid’s shooting at moving objects that made him a crack shot of legend. But today, almost any police officer could match him—shot for shot. Read how the police ate fast becoming crack shots. royal, for police appeared out of thin air. In the car was found the loot from a bank robbery committed only a few moments before. Back of the brilliant shooting which dazzles spectators at police ranges, lies long, steady practice and training which is making police marksmanship feared by the underworld as never before. A modern police department today is really a miniature army, complete from its arsenals, bristling with sub-machine guns, riot guns, high-powered rifles, and side-arms, to grenades and guns which lay down a barrage of gas. There are armored cars with bullet-proof windows, and shielded tires, forming veritable tanks for street war- fare; armored motorcycles with machine guns or automatic pistols, mounted between. handlebars. Most important of all, however, is a well- Magazine, May, 1936 Special shoulder, stocks (above) Br pale imma making them precision arms whi be fired with great Thi ures the officer Left—Shell reloading | their used cartridge irained line of sharp-shooting officers. In certain cities of the United States, a system of training is fast making every man a crack Shot, and as a result, police guns are speaking with new authority, Every month, each man on the Los Angeles force, from the Chief on down, must go to the pistol range to demonstrate his skill with the revolver. On the firing line he finds a dozen or more other officers, also anxious to qualify. In the sunken pits just below the earthen backstops, trusties are waiting, ready to aid by manipulating the targets and re- cording the hits. Speaking into a microphone, a rangemaster directs the fire. At his command, targets jump up from the trench. “Fire!” comes the command, A dozen pistols speak at once. appear in the paper-covered targets. Now, from the pits, bamboo pointers dart upward. Pointing first to each hit, then to a numbered post beside the target, the stick [Continued on page 132] Holes 61

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FLOODS —WINTER'S Stalking the coldest winter in years, it sneaks beneath your door, this fluid snake. And once having watched its rise, you realize that no monster is more to be feared than FLOOD WATERS. Dams which are built for Dower purposes are often valuable protection against flood losses and damage. HE gentle patter of spring rain on the roof is a positive cure for insomnia. Yet, in Paga-Pago it is practically impossible to out- sleep the “devil-drum” drops, for there the tropical rains are seemingly endless. But, for downright fear of rain, take America’s flood area population just about this time of year. Millions of people worry when it rains in this area. "They know that rain melts snow, that snow turns to water and that water runs downhill This past winter found the north- ern states biockaded by one of the worst series of blizzards ever recorded. Damage by snow- fall alone ran into the millions, while the costs in snow removal, delayed transportation and interrupted communication service have not yet been totaled, Added to this was the Joss in human life. And still the toll of winter has not been paid in full. There remain the 64 This past winter, worst in half a century, wreaked havoc on transportation, but the Zephyr bowls un- interrupted through drifts at eighty miles per hour. Melting snow now threatens thousands of homes, Utah flood waters swirled down on Salt Lake City, piling up cars in one of Mother Nature's unusual freak traffic jams. floods, the dread result of the snows melting too fast for nature’s water troughs. Approximately twenty-five million dollars worth of property, not to mention more than a hundred lives were lost when flood waters swept down from the hills in eastern Colorado and southwestern Nebraska early in June 1935. The Republican River, swollen by cloud- burst rainfall rose to heights never before known. During succeeding weeks similar floods devastated parts of Texas, Wisconsin, Modern Mechanix & Inventions Devastating AFTERMATH When you view newsreel shots of a flood, think kindly of the airplane pilot. He al directs i those in immediáte danger. emergency or Piled up in Chagrin River, ice floes, the aftermath of the February blizzards, defy dynamite blass discharged to break jams. Flood waters were sent backwashing through the Ohio countryside before the treacherous jams were finally broken. Ohio, Pennsylvania, and New York. The south central New York floods of July 7 and 8 caused the death of fifty-five people and the loss of more than twenty-five million dollars worth of property. : When two inches of rain falls in a single day people think they have had an exception- ally heavy storm. When four inches falls in one night they think they have had a cloud- burst. Twenty-four inches, two whole feet of Magazine, May, 1936 by IVAN E. HOUK The house bui upon sand or rock is a “push over” for Old Mas River when he goes on a ram- page. A lifetime of endeavor was wrecked when the ho (above) and rounding — buili were damaged. water, fell in southwestern Nebraska that night of June 1, No wonder the Republican River went on a rampage. Bridges were wrecked, railways torn out, buildings de- stroyed, homes washed away, and whole families drowned. This was the most extra- ordinary rainfall ever known in that section of the country. Disastrous floods result from several causes. They result from the breaking of levees, the failure of dams, or the formation and subse- quent collapse of ice gorges. They result from the temporary blocking of stream channels by landslides, snowslides, or ice avalanches from overhanging glaciers. They may be due to the choking of watercourses by vegeation during the late summer months, or to the sudden melting of accumulated snow deposits during the late winter months. Sometimes they result from tidal waves caused by severe earthquake shocks, or from [Continued on page 136] 65

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Amateurs Capture ACTION — for the NEWSREELS «s x 68 RISON sirens howl as a band of desperate convicts blaze their way out of the penitentiary with smuggled guns. Hot on their trail follows an amateur cameraman. He photographs scenes of the resulting confusion, the hur- ried marsballing of police cars, the armed guards pacing the prison walls, the excited crowd of curiosity seekers, and gets human-interest shots overlooked by professional news- reel men. A famous flyer is forced down far from big-city landing fields—and from the commercial movie reels. His accident enables a local amateur photographer to score a clean scoop which nets him a handsome profit. A. spectacular fire, a big marine collision, a flood, explo- sion, or earthquake—all spell opportunity for the hundreds of free-lance amateur cameramen who are invading the field of newsreel photography. The unexpected, always happening, is the amateur news- reel man's best friend. Although most big news events are covered by pre-arrangement, now and then a sensational story smashes into the headlines, finding news-gathering agencies unprepared. A quick-witted amateur already on the scene may sell his negative to them if he acts promptly. A dollar a foot is the average rate, and sometimes more for At the airport to welcome Amelia Earhart at the end of her Hawaii to California hop was an alert amateur cameraman. She rewarded him with this shot. Another amateur swung his camera into action to get shots of a Chinese New Year cele- bration. Part of the procession is shown at left. Above—This is one of the amateurs. The cameraman is lens to get a close-up of are numerous kinks in newsreel work. Here an amateur is using a portable titling board, The titles are fet- tered on paper, inserted into holder, and quickly shot. Modern Mechanix & Inventions When a peaceful valley suddenly becomes the scene of a roaring flood, the amateur news cameraman is on the job. Where hurricanes rage or gteat explosions take their toll, the newsreels depend upon alert amateurs. This article tells how it is done. exclusive, sensational pictures of national intetest. Foreign subjects generally pay double. Latest in newsreels is one distributed nationally, once a month, for home movie projectors, Recently press representatives sat in a darkened Hollywood projection room and watched the first edition of this sixteen- millimeter reel, shot entirely by amateurs, unfold late flashes from all parts of the country. They saw auto drivers speed around a dirt track in a championship race; watched in turn an athletic contest, a spectacular Magazine, May, 1936 shown above using a telephoto leis end in rapid follow shots. parade, and miners panning pay dirt in a new gold rush, They got glimpses of a rare turkey-fish from the South Seas; marveled at an odd, elephant-shaped fungus recently discovered in Nebraska; and watched a thrilling undersea battle between two fierce tropical fish, Already two hundred cameramen are covering big news as it breaks, and more are wanted in every section of the country, ac- cording to one news editor. “There are hundreds of news subjects in each locality waiting for you to photograph,” he tells his contributors. “You must use your ingenuity and manufacture news, stunts, and human-interest subjects. “If possible, shoot each subject from three different angles—eye-level; high, or ‘bird’s- eye’ angle; and low, or ‘worm’s-eye’ angle. If all your shots are taken at eye-level, break them up in the following man- ner: 1—Long shot; 2—Medium shot; 3—Close-up. Close-ups Army sic manewers are the most important shots furnish a real test for in newsreel work, The public the newsreel camera- o k man, Here two oper- likes to see the action near at ators aze eni filme eke uas hand. "A tripod is essential for filter 6 brini ing dh only in cases of rare and spec- action closer. long FRE TUE tacular news events—shots that universal tripod aid cannot be re-taken—will we accept pictures that are un- steady on the screen. Don't panoram or tilt unless abso- [Continued on page 124] 69

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RobertPage Lincoln, hunting and fishing edi- tor, holds up e small mouth bass he caught in a Minnesota lake. Mr. Lincoln has fished the small mouth from East to West and his findings are told in this article, HILE the large mouth black bass is generously distributed throughout the country, its close relative, the small mouth bass is likewise to be met in choice lakes and streams in the United States and Canada. Game and fish departments, recognizing the unusual gamey qualities of this species have extended the range into places where it was never found before. As a result small mouth bass are now being taken in great numbers west of the Mississippi, while previously they were found only in the East. The small mouth bass is a firm, compact fish, with far more symmetrical lines than the large mouth. When a large mouth bass goes over three pounds in weight it will "belly down" as the saying goes, its Fly Rod Fishing for by ROBERT PAGE LINCOLN abdomen hanging more or less flabby and soft to the touch, The small mouth bass, regard- less of its size, retains its original lines, has a firm abdomen and does not have a flabby stomach as does its relative. The small mouth bass has no stripe on its side, Its coloration varies with the region and the water. You may take.a small mouth bass in one section of the country that is quite greenish; in another section, brownish in color while in still another the fish is likely to be much barred and blotched, which arouses no end of speculation as to whether or not it is a different species. Because of its stream nature the small mouth bass, to a great extent, takes on some of the characteristics of the trout in that it feeds on insects along the shores very much as does the trout. By reason of this fact fly fishing has long been a favorite method of taking it. The flies used are generally tied to No. 1-0 hooks, the O'Shaughnessy hook bend, in the so-called hand-forged type, being the most desirable. These bass flies are made in the standard regulation variety, embracing such well-known patterns as the Grizzly King, Yellow Sally, Coachman, Royal Coachman, Professor, Red Hackle and many other colors and combinations of colors. Ninety per cent of the flies as used on the small mouth bass are Above— Typical small mouth: bass water, trout, small mouth thrive in t water, thoi now, through planting, maoy. sa, apie do Pei emi pendet. Latent ot ined some typical bass baits d for the fly fisherman. WHISKER dori Small Mouth Bass Second only to the trout in fighting skill is the small mouth bass. This vigorous warrior spells thrills galore for all fisher- men. Prepare to land him by reading Mr, Lincoln’s article now. quite large, the No. 1-0 being the all-around size. There are times, however, when smaller flies will prove effective on many streams, especially where the water is clear. Such flies should range No. 3 to No. 6 in size. The best type of bass fly is one without any wing feathers, with just the hackles at the head of the fly, which, in the No. 1-0 size are an inch or more in length. A fly of this sort can be worked nicely in the water, and, with twitches of the rod tip, each individual hackle filament can be set into action, giving an open- and-close effect to the lure that is extremely life-like. As opposed to this, a fly possessing stiff, upstanding wings has little or no action to it at all, and merely turns and flops from side to side, imitating nothing and taking less. Bass flies in the No. 1-0 size and in regula- tion patterns are often used in combination with a small No. 2 gold or nickel-plated spin- ner ona shaft, By reason of the interchange- able snap-fasteners or sliding coil-fasteners A on these shafts you can take off one fly and put on another in a few seconds time. Re- gardless how flies are used when fished with- out the spinner arrangement, those having stiff, erect wings are out of the question when used with spinners. The wingless, hackle or palmer type of fly works most effectively with the spinner arangement, and is to be highly recommended. By way of explanation, a hackle type of fly such as the Brown Hackle has hackles concentrated at the head of the fly only, with the body bare. In the Palmer type the hackles are distributed along the whole body, the same fairly bristling with these filaments. Both of these types are to be given first place among flies as used on small mouth bass in fly fishing. Combined with the tiny spinner, the fly of either variety is ideal and most effective. Lures for the small mouth bass as used by means of the fly rod are many and various. Aside from the spinner and regulation bass flies, as used under the water surface, there are bass bugs of many kinds. These bass bugs have cork bodies and float. They are less [Continued on page 128] On still water such as shown below there are bass bugs in a Rost of varieties that are extremely effective, Some of them are shown at left, These are used fiy-rod, and are cast up on logs, overhanging grass, boulders and then dropped into the water. This means action. BUCKTAIL BUG AS 7 poss ER MINNOW.

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In this machine the Helene begins to tal eal into the fibers to form a strong bi Citcle--Here is the molded i through pattern ste back, Each color har a stencil cut 10 match perfectly with others to fil design. HROUGH all the centu- ries man's progress is re- flected in the homes he has kept, and is readily traceable in the floors of those homes. Prehistoric men paid little at- tention to floors, but when the long arm of the Caesars reached out into the Orient, they found floors of inlaid ebony, teakwood, mosaic and pearl, but only in the homes of the rich. In 1863, Fredrick Walton, a youthful in- ventor of Yorkshire, England, made a great discovery in an open paint pot, over the con- tents of which the usual scum had formed. Turning his inventive genius to the matter of a use for this tough scum, he developed the idea for a new material which brought fine floors within reach of the average family for the first time. By mixing a small quantity of gum with the oxidized linseed oil, which he had dis- covered in the paint pot, Walton found that he had a very satisfactory binder for ground cork and color pigments when pressed onto a backing of burlap. So began the great in- dustry that today extends into every country. He called his invention “linoleum”—from linum, the Latin for flax, and oleum, oil. 82 An inventive mind and a can of paint left open by acci- dent were the co-founders of the great linoleum in- N dustry. Its manufacture is = as strange as its origin. The manufacture of true linoleum involves several major operations, developed first by Walton and used by linoleum manufacturers with but slight modification to this day. The steps are as follows: First, the cleaning and grinding of the cork and the selection of the burlap. Second, the making of “linoleum cement” from linseed oil. Third, combination of the cement with cork powder, wood flour, minerals and color pig- ments to make “linoleum material.” Fourth, the application by heat and pres- sure of the linoleum material to the burlap base. Fifth, the seasoning or hardening of the fin- ished linoleums in great ovens in which the linoleum is baked for months on end. Modern Mechanix & Inventions Another Industrial Accident’ The Mediterranean countries of Portugal, Spain and Algeria contribute cork. Cork has certain qualities possessed by no other materials, notably its lightness combined with strength, its elasticity, its imperviousness to air and water, and its insulation qualities. The cork is run through huge grinders, and then between enormous stones where it is ground so fine that it resembles talcum powder. India grows jute, a reed whose strong fibres are woven into burlap. Only the Scottish weavers at Dundee weave burlap of the fine and even texture suitable for use as a backing for linoleum. Every yard is closely inspected so as to make sure that the burlap is free from knots and heavy fibres and of balanced strength between its width and length. Linoleum "cement" is made from linseed oil and certain resins, which properly combined and treated, form a tough, rubber like material of great strength and endurance. Mineral color pigments, obtained from various parts of the United States, are also an important factor, since bright and colorful patterns have come to be much in demand. Finely ground wood flour helps to carry these brilliant hues. [Continued on page 120] Cork, becas it i tough spongy, resistant ta oil Went bad oí. grt lnscluion value, making linoleum. into a powder as fine More than a mile of lino- leum is baked at one time in this oven, Baking lasts m three to six weeks while linoleum cures. In this rotary inlay machine, lino- Sum Desire solid colora are eas in easily from mencliling by hu elean-cen lines. Magazine, May, 1936 83

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Having stripped his machine of everything save the bare essentials, this rider prepares for the start of « Touri Trophy race. Motors are started after flag has been dropped. NE of America’s newest and most excit- ing sports is misnamed: there should be an “N” between the initials of T. T. rac- ing, for there are few forms of excitement that contain more high-explosive qualities than this motorcycle pastime. A T. T. race is an American, and usually a miniature, version of the famous Tourist Trophy races held yearly on the Isle of Man. It is a motoreycle contest packed with thrills, spills, dust, speed, breath-taking moments and a lot of fun for everyone concerned. It looks like an elaborate and noisy way of committing suicide; but surprisingly few bones have been broken in such competitions. In fact, women riders frequently tackle the milder parts of a T. T. course. Let’s accompany the Ohio Ramblers on a Sunday afternoon visit to their T. T. track, which is scarcely a year old. The Ohio Ramblers is a motorcycle club, made up of riders who live in and near the city of Mas- sillon. The Ramblers' track is, so the club mem- bers claim, one of the most perfect in the 86 Breath-taking leaps of 50 feet and more are made on one of the pre- pared jumps of the T. T. track. This rider takes a stock machine * hurdle for à 25-foot jump. Small tracks provide numerous big ti Packing Thrills by WALTER E. BURTON state, if not in the country. It is the result of a long and careful search for just the right kind of land. An outstanding feature is that spectators can stand on top of any one of several neighboring hills and view the entire course. There are no large trees in the area, only a few shrubs—mostly bushes bearing long, sharp thorns which riders have learned to respect. This being merely an informal practice run, the machines are standard in design and equipment. For actual racing, special stripped motorcycles generally are used. All of the riders wear leathet crash helmets as a matter of protection. The starter drops the white flag. The mo- tors, which had been dead, leap into action, and in a flash the sextet is roaring around the first turn. This is a very mild turn, being only a right-angle one, partly banked. Hardly have the machines straightened out when the leading one strikes the first of a series of hair- pin curves. Some of these curves are tilted at dizzy angles on the side of a hill. Now the skidding cycles have negotiated them safely, executing in the process a few dizzy and dust- raising fish tails, and are headed down a short but steep bank preparatory to making a sharp right-hand turn and climbing to the top Modern Mechanix & Inventions Here is another view of a motorcycle stripped down for some fast work on the T. T. track. Right, above— Taking the turns on a well planned cóurse. As the riders plunge over the steep embankment, they are confronted with a sharp tura to the left and another steep hill. Such riding requires skill. in a Motorcycl STARTING AND FINISHING Cine of the steepest and tallest hill on the course. When the dust clears away, a rider is seen struggling to his feet. His machine is lying on its side a yard away. The five remaining machines, after engag- ing in a short but lively hill-climbing contest, have reached the high point of the course, and have idled down for the next test. This is a descent of a rocky, loose-dirt hillside that would make a mule pause and consider. But the motorcycle roughriders do not hesi- tate. Down the hill they slide, and skid around the sharp turn at the bottom, shower- ing the surrounding bushes and a few ven- turesome spectators with dirt. There are two sprawling flops on this bottom turn, but the riders are up in an instant and on their way. Then come a series of up-and-down waves Magazine, May, 1936 € Above—Loose rocks and gravel are pur. posely left on the track to further test of the skill of the rough-tiders, Left—This proposed course, patterned after the Massillon, Ohio, T. T. track, packs as many thrills in its ‘half-mile length as most cross-country tracks. Notice the jump into the plowed field near end of course. scrambled with a few more hairpin turns, and the motorcycles are on the home stretch. There remains one more formidable obstacle. The track has been dug away to\produce a sudden rise of perhaps two feet, over which a rider has to leap in order to complete the run. Because stock machines are being used the cyclist hop this miniature cliff with con- siderable caution, flying through the air per- haps only 10 or 15 feet. However, in actual competitions, when stripped machines are being used, riders sometimes make broad jumps of 60 feet, and clear the ground by 4 or 5 feet. And that, in brief, is what a run over a T. T. course is like. For the most part, the ma- chines travel in low gear, although.on some [Continued on page 126] 87

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Plans for "LITTLE BEAR" O HOLD the tiller of a sensitive racing yacht, is now a thrill to be had by any- body who builds a Moth boat according to the accompanying plans. It is the smallest sailing yacht with an International Racing Association. As five of these inexpensive little craft form a divisional fleet, it is an easy matter to have sailing races on almost any lake or river in the country, and at the same time have a boat for use in state, national and inter- national regattas. The Moth described in this article, which can be built with ordinary tools, was designed by Captain Joel Van Sant, originator of the Moth Class. It is specifically known as the Potomac River model and is quite fast. With watertight bulkheads at Stations No. 2 and No. 5 it is unsinkable and, although of the scow, or skimming dish type, its lines are graceful and pleasing. An experienced boat builder only needs to glance at Figures 1 and 2 to build the hull. But certain specifications are necessary for those unfamiliar with this type of craft. Before going ahead with any of the actual construction work the very first step is to thoroughly study the drawings—particularly those in Figure 2 which give all the necessary dimensions for laying out the full size plans —an essential preliminary in building any boat. The line dimensions, you will notice, are given as to the outside of the planking. Therefore, in laying out the frames, it will be necessary to deduct the thickness of the planking used—in this instance one-half inch at all points involved. A study of Fig. 4 will clear up this matter for any who find it obscure. In this diagram the lines dimensions at Station No. 3 are given and the limits of the planking indicated. From your full size drawing you now make paper patterns for the frames and the keel, always remembering to allow for the plank- ing thickness. Full details of the frame construction are covered in the drawings—particularly clearly in Figures 4, 5 and 6. The bow plate, covered in Fig. 10,is sawed out of a piece of solid white oak. The transom is simply a piece of 1" white oak or mahogany eut to the angle pro- duced on your full size drawing. It is best to put the bevels on bow plate, 94 Joel Van Sant The Moth type yacht is the est sailing craft with an International Racing Association. Above photo shows the original Moth as designed by Captain 1930. 1 I transom and frames after they are set up. The frames are joined with brass screws as shown. With the frames built you can turn your attention to the remaining essential frame member—the keel. The keel is formed from one 12-foot length of fir or yellow pine, 4% inches wide by 54” thick, and a 12-foot length of 14-inch white oak, 2% inches wide. The two are firmly screwed together forming the section shown in Fig. B. Fig. 7 shows the method used to set up the keel. A 12-foot length of 2"x12", or 14", planking is sawn out so that the exact curve or line of the keel, fore and aft, remains, the necessary measure- ments being taken off the plans. With the keel set up in the mould, or jig, fasten the frames in place using brass screws throughout. The bow plate and stern transom are next screwed to the keelson and braced firmly with 1%” or 11%” oak knees as shown in the inboard profile drawing, Fig. 1. With bow plate, transom and all frames in place, temporary braces are secured to the sides to hold the frames rigid while notching Modern Mechanix & Inventions a “MOTH” Class RACER them for the chine and the deck clamp. These notches should be %4” by 1” and are clearly indicated in frame detail. Next fit the chine pieces and the deck clamps, bevelling the frames as needed. Two 9”x12” planks are then clamped in position, marked off and sawed to shape. These will form the sides of your boat and they may be of white cedar, mahogahy or redwood—14” thick. (Note: Either 96” or %” planking is specified but the accompanying drawings show half-inch planking throughout.) Fasten the planks to the frames, deck. clamp and chine with brass screws, then loosen the keel former supports and turn the boat over, still leaving it attached to the jig you have em- ployed to shape it. The frames may now be notched on the under sides for the seam battens, as shown in Fig. 5. The number of planks used on the bottom, of course, determines the number of seam battens, but if you use 8-inch planking as shown, there will be two battens on each side of the frames, The battens, of 12"x2" spruce are fastened with brass screws. You are now ready for the bottom plank- ing. This may be either mahogany, cedar or FIG. 2 — COMPLETE PROFILE AND CROSS-SECTION LINES "Ln S A MOI ERNOD ARE TOPUTNOE QF FLANHING "P | gne n Senn. EO Bow Pare, TANG -wace or aft Tansee acuto a NEAS EL TZ eR [aurum conan Lives /PROFILE ey k ia 1 1 rri | Bas Line 1h 24° — Spese {fen} arie. T HALE-BRE pA li csoss secrioNs or 18) yale STATION Fig, 3, above right, is a yeneral view of the completed Moth and rigging, Inset shows the details of mast head. In Fi note that station dimensions are to outside of planking. See Fig. 4 for After studying above drawings, lay out plans full size witht a 12" Magazine, May, 1936 construction. Cut rudder to shape shown above. jatten. Full size supersede any minor deviations. 95

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Centerboard Adjustment Made When in Place COMMERCIAL PINTLES CAK TILLER pW.T BULKHEAD ADJUSTMENT AND GUDGEGNS v S ioc à | corona nuit d OAK KNEE iy ‘sour [usenfü cuum TP imm b ieee et oni HEE TRANSOM i^ Our. oR MarnoGAwY — e] He" CEDAR DECKING MUSLIN SET IN PAINT PARTNER orc L figs ALITTLE BEAR! A MOTH CLASS RACER Above—Note shape and dimensions of centerboard in the cross-section drawing. ‘Watertight bulkheads are at stations 2 and 5, stations 2 and 4. mahogany, or redwood may be used. The garboacd redwood, %” thick. The garboard strake, or plank nearest the keel, is fitted first. Plane off the shoulder of the keel to conform to the frame sides and coat it with thick paint or marine glue. The batten is similarly treated. Then screw the garboard strake securely to the bow plate, to each of the frames and to the stern transom. Put some good screw fastenings along the edge of the keelson as well, and then use copper clinch nails or rivets, spaced about 2” apart, to secure the plank to the seam batten. The jig or former, may now: be removed from the keel. Take out the screws and plug the holes tight. Then rip the centerboard slot. This slot should be 12" wide and its size and location can be taken. off the drawings, Fig. 1. Fig. 9, in conjunction with the inboard pro- file drawing, Fig. 1, explains the simple con- struction and fitting of the centerboard trunk. The trunk is fastened to the keelson by 3" brass screws driven up through the keel. Do not drill the hole for the centerboard adjust- ment until later when you have the center- board in place. With the centerboard trunk in place the next step in order is to make the deck beams. These may be crowned, or rounded, to suit individual ideas but a four- 96 / tech aus ss TOTINDEITUET-NTETIH The centerboard trunk is fitted between ‘or the bottom planking, either \-inch cedar, e (next to keel) must always be the fret plank to be fitted. inch in four feet curve is recommended. Make a master mould and saw or steam bend all the deck beams to this mould or jig, estab- lishing the widths required from the posi- tions shown in the deck plan. The deck beams themselves may be of 7%” by 114” or 114” oak, or you may use a lighter material. The beams at the watertight stations how- ever should be in all cases 1”x114” material as shown in Fig. 6. The deck beams are screwed in place at all frame stations and also where shown in the deck plan, Fig. 1. Where the cockpit occurs, put in full beams, sawing out later after decking. One thing remains before laying the deck. This is the installation of the mast step and partner. The decking, of 14” cedar, is secured to the deck beams with well countersunk finishing nails. It is laid fore and aft—the same as the bottom planking—and you will find that four-inch planks are the best. With the deck nailed down and the nail holes filled with white lead, plane and sand the entire deck down until it is perfectly smooth. Then cover with heavy paint or marine glue and stretch muslin smoothly over the entire surface, bringing the edges down over the side planks about one inch Modern Mechanix & Inventions Mast,Boom Must Not Exceed Three Inch Diameter HALF ROUND T Corer sen crain mavi zs "SCREWED JOINT: tic. 4 HALF SECTION AT STATION 9.3. LOOKING ART = CUT PLANA AWAY TO CONFORM TO THE EXACT CURVE OF THE NEEL- SEE FIG 2 FOR PROFLE UNES SCREW KEEL TO SHAPED PLANK i; DÉCK BEAM Wx jg" qur r 2 [WIDTH Cu M Sy S IIT AE [RR eu eau ORAL) SEGGLE WITH PLENTY OF WF. GLUE Figures 4 to 10 show some of the finer details of construction. MOULDING, V2" CEDAR FLANKING. NOTCH FOR BATTEN Fig. a sje" rion oC Ae. Ere: fis B SECTION Pa uy COAT ALL SEAMS AND GASKET WITH THICH PAINT- FASTEN TO REEL PROM UNOEASIDE WITH 3° SCREWS AlL OF FRAMES In laying the keel (Fig. 7) the member is firmly screwed. into the mould of the cut-out plank to be released after the frame is built up to a point where it will hold in shape. before tacking muslin down permanently. At this stage the hull should be painted with a good coat of white lead and oil. The rudder explained in the drawings may be either of one-inch oak or 10-gauge metal. The spars are planed round with a uniform dimension. The “Moth” class boat does not permit mast or boom to exceed 3” in diameter. Actually a 3" diameter mast and a 2" boom will be found to achieve average requirements. A 5” sail track is put along top of the boom and on the after side of mast. The sail shown in the drawings, Fig. 3, is the largest permitted in the class. The metal fittings are few and simple. It is recommended that all of them be obtained from commercial sources. The chain plates are attached to the side planks and to the prow. Five-inch turnbuckles are large enough for the standing rigging which is regular 4%” stranded galvanized cable. The running rig- ging is of 36" manila. The peak halyard, is run through the sheave shown in the detail Magazine, May, 1936 sketch on Fig. 5 to a check block on the mast. A traveler is needed for the sheet as also one cr two small blocks. The flooring, which is of 4” cypress, is laid lengthwise as shown. The cockpit coaming should be 3” ma- hogany or oak; splash boards are of the same material The final touch is to put on the moulding which is half round mahogany or cak and is laid along the edge of the deck covering the tacks which hold the muslin covering. OTHER BOAT PLANS AND PROJECTS Plans for building 20 kinds of water craft from rowboats to motor cruisers are fuily described in the new HOW TO BUILD 20 BOATS book, available at 50c, postpaid. More than 35 boats are described in MM's free blueprint catalog. Blueprints of LITTLE BEAR greatly enlarged and printed on durable blueprint paper can be secured at $1.50 per set. Order from: Modern Me- chanix Publishing Co., Greenwich, Conn.

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“Chinook” A MIDGET GAS This is Chinook com- pletely assembled with gasoline tank and spar Seil in place. Shaft is fitted. A.C. MIDGET SPARK PLUG ALUMINUM HEAD HOLES FOR L SPANNER WRENCH TRANSFER PORT Simplicity of construction makes this engine an ideal project for the home shop. It can be used on four-foot model lanes or with a water jacket can be installed easily in midget power boats. by WESTON FARMER IHE Chinook is so named for summer time. It will provide such a breeze for the running of any small 4’ model plane or enough power for a model boat. It can be built by anyone who has access to a lathe and a drill press. It may also be built as a marine engine, by leaving off the cooling fins and pressing on a brass barrel between the top and bottom fins to serve as a water jacket. Provided thus with a three-inch flywheel, it will reliably power a small model boat of 24 to 30 inches overall ===“ length. ‘The operating principles of this little gas engine are explained in the sketches. It is a two-cycle engine. As the piston nears the L242 top of the stroke, a vacuum is formed in the crankcase. This vacuum draws gas through the hollow crankshaft from the simple carbu- i, Tetor, or mixing valve, on the under side of ENGINE FOR YOUR MODEL the shaft housing. The spark explosion sends the piston down. At the bottom of the stroke a transfer port on one side and the exhaust pert on the other side of the cylinder are opened. The burnt gases escape, while the fresh gas in the crankcase is forced through a slot in the piston wall through the transfer port into the cylinder. The crankcase on a two cycle engine is the most important part. In Chinook, the draw- ings show the proper dimensions for an alumi- num crankcase which is intended to be cast. Tf you do not have a foundry handy, it can be variations. In preparing the pattern for the casting do not bother with shrink rule. The ` pattern is too small to be affected by shrink- age. Make a split pattern, using generous core prints, and the result should be a smooth casting. Chuck the piece in the lathe, face off the rear end, then drill a 36" hole through the bearing boss. Into this is pressed a drive fit Left——Front view o the hot dry winds that sweep B a ^ 4 mode | plane. ds across the middle west during the turned and'milled from the solid with minor i | arrani Taat 12 o This Fairchild Motor weighs only complete. f motor. Orig- inal mode! kad bent rod instead of knurled knob on carburetor. BAFFLE Above—Cylinder removed, showing PLATE. piston and connecting rod of engine. E CYLINDER (Ast RON) EXHAUST PORT Xd o imc y j CRANKCASE DIMENSIONS "m cx | ch (ACUMINUM) À ALUMINUI BACK PLATE Right—Carburetor is simply mixing valve. Air, sucked through iy” hole, mixes with gas from needle hole. Timer is brass spring resting on cam and brass clamp. Below — Crankshaft as- sembly, Intake hole traps gas from carburetor, passes it to crankcase. DRIVE FIT BRONZE BUSH- ING BEARING BOSS cua oie STIFF wire Y VigROD. He 2-56 MACHINE Screws MILL OUT TIMING CAM CONNECTING few os innt) At top—Exhaust manifold and transfer port cover are cut from sheet brass and soldered or brazed. Rib in transfer port may be omitted though it improves efficiency of motor. Slot in piston allows gas to pass from crankcase to port. Magazine, May, 1936 a 101 Drawings above and at right show assembly and dimen- sions of crankcase and cylinder. Both ere castings, but can be turned from solid by cutting various pro- jections separately to shape and brazing whole together. 100 Modern Mechanix & Inventions

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Lapping Method Insures Smooth Running Engine Transfer port is un- method to lap cylinder Use water soluble valve grinding compound, starting with coarse and finishing with fine grade until a mirrorlike finish i» obtained. Above—Size of cylinder, covered. Right—Good and pistos PISTON BRASS LATHE CHUCK BRASS TUBE ADJUSTING TAPERED SHAFT NUT PROPELLER / Tess fi T | acus II A BACK COVER! PLATE LES (a SEAL WITH LIQUID GASKET MATERIAL Above—Seal all joints with gasket matecal wh embing. Note timing cam which pring to droj Clarap is insuj Right--W completing spark lated from crankshaft fring of the. mo and coil ground ine em Battery leads should be securely connected to engine. bronze bushing. This bushing is reamed out to take the 7” crankshaft. Remove the case from the chuck, square the cylinder land face, smooth it off, and drill the hold down bolt holes, as well as the tap holes for the 2/56 filister head machine screws that hold on the ys" aluminum back plate. This back plate is held sealed by the use of liquid gasket material obtainable at auto supply stores. Drill out the carburetor intake hole with a #5” drill, shove the reamer through the bear- ing hole to clean off the burr, and the bearing 102 CYLINDER TO, GROUND QV. TO SPARK PLUG POSITIVE. BATTERY LEAD JO INSULATED e COLLAR and crankcase are prepared save for the carburetor. The carburetor is simplicity itself. It is merely a mixing valve, placed low in the engine to feed into the rotary valve, which prevents the engine from “Two Cycling”, or reversing. Through the sleeve of the intake pipe run a 4%” drill. Tap one side. On this, the right side facing the engine, insert a small brass sleeve 7,” dia. into which a yy” rod has been tapped with a 72 thread, This rod con- Modern Mechanix & Inventions Operating Principle Propel plained, Side view of engine, showing position of tank and spark coil. Timing points are open, This is an indication that piston is on the exhaust stroke of cycle. stitutes the needle valve, and must be pointed on one end. In the opposite side of the intake, a short 3&" length of steel with a needle hole, drilled in with a jewelers drill, is sweated. To this tube is doped a small rubber hose running to the toothpowder can which has been re-sol- dered to make a gasoline tank. The needle of the valve inpinges against the needle hole, and regulates the film of gasoline flowing into the intake. On the shank of the needle valve a small serrated collar is soldered. From the ” retaining tube a piece of stiff wire is run to bear on this collar to prevent vibration from. disturbing the mixture. This engine has fixed timing in the interests of simplicity. The brass spring running from the little knob on the bearing, bears against a cam cut into the steel propeller collar. This cam is made by filing a flat spot 75” in depth with a 14" face, placed opposite the opening in the hollow crankshaft. This c.r.s. collar is 44” diameter, and the face of the cam is 4%” wide. The collar is secured to the crankshaft by a drive fit, touched with a bead of solder to sweat the two together. A touch of a sol- dering iron will loosen the collar and it may be reset to suit your idea of correct timing, but in practice it has been found best, with an engine made from the plans shown here, to set it opposite the intake port on the crank- shaft. Magazine, May, 1936 ove is cut Ton 5 by 137 block: FOR SPARK Right—Theory of two cycle Chinook ex- Hole in hol- fow crankshaft acts as velve admitting gae from the carburetor. of Model Engine ls Simple COMPRESSED; PROPER INSTANT EXHAUST POAT CLOSED À) CRANKSHAFT TURNS TO HERE BEFORE PORT CLOSES POSITION OF VALVE FROM FORWARD AFT— PORT HAS ADMITTED ABOUT| ZZ COMPRESSION AND INTAKE STROKE INCOMING GASES FROM $= CRANKCASE DEFLECTED, UPWARD BY BAFFLE PLATE TRANSFER PORT ataust ge tws [rasmona | Yave took- E ING EROM FORWARD AFT [z On exhaust stroke valve in crankshaft is closed, gas from crankease rushes through pis- ton and port into cylinder while burnt gas cape. Change valve pos s shown. above for anti-clockwise engine. TRANSFER AND EXHAUST STROKE The wiring for the timer is orthodox. One wire is grounded from the coil. The other wire leads from the coil to the insulated collar which is clamped around the bearing boss. Two platinum points off an old model T coil furnish contact, and when the cam rolls around the circuit is made. When the circuit is broken, the coil sends a hot spark to the plug. The spark plug is a midget. The sec- ondary wire from the coil of course leads to the spark plug. Across the contact points a small wireless condenser is bridged to reduce the sparking at the points, One wire of the battery goes to the post in the coil, the other 103

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CAPTIVE Model PLANES "MANDALAY " AIRPLANE KITE 1" HOLE- INSERT LEAD Disc. SLOT AND CI ^ LEAPING EDGE SPA: Vax 3/6" BALSA. WING STRUCTURE IS COVERED WITH RICE PAPER. AND "DOPED" THE SAME AS WITH MODEL PLANES by DICK COLE OWN through the ages the common kite has played a very important part in the advancement of science. The early Chinese used kites in the construction of bridges, Franklin used the kite in his electrical ex- periments, and the kite was used, too, by the Wright brothers in their early aviation ex- periments at Kitty Hawk. Although kite fying has been one of the chief pastimes of youth throughout the world it takes on new form with kites being fashioned after modern aircraft. The kite plane opens new fields to the model plane enthusiast who can now build ships that will soar for hours instead of merely jumping off the ground for a few seconds. The simplest of airplane kites is the “Man- dalay” which conforms closely to an ordinary model glider, except that the dihedral angle is somewhat greater. Then too the operator is able to control the rise and fall of the plane simple by pulling on the kite string. The string, which passes through an eyelet di- rectly under the center support of the wing and then along the fuselage through another eyelet attached to the elevators, permits their adjustment while plane is in flight. All three types of planes illustrated are con- structed along the same general lines. Cut the plane's fuselages from 55" balsa wood and 106 1/2" SQUARES: peZ SAUREN WING IS SLIPPED INTO NOTCHES ADJUST TENSION FUSELAGE, 3/32" BALSA OF RUBBER, BAND SH HA ener TRAILING EDGE SPAR, 3/32" XI/A" BALSA EMENTED ELEVATOR 3/32" BALSA, TAPERING TO Ve" AT TIPS. AMBROID CEMENT YER. he x (SEE DETAIL) THE 3'DIHEDRAL PRO- | VIDES LATERAL STABLITY |} ELEVATION = * Both Mandalay and Sky Arrow kites are constructed according to the plans shown above except for slight physical changes. All planes use the same type of rubber band elevator control. build up the wing in the same manner as in regular model plane construction. Cover the wing structure with Japanese tissue and then apply the dope so as to draw the wing cover- ing tight. Cut the elevators from d" balsa to the size and shape shown. The angle of the elevator is governed by a rubber band which is at- tached to the fuselage. Several sizes of rubber bands should be tried in order to secure the correct tension. A 1” hole cut in the nose of the plane holds a small piece of lead used to balance the plane when in flight. In constructing the “Sky Arrow” the pro- cedure is practically the same as for the Modern Mechanix & Inventions Become FLYING KITES The kite plane opens a new field for the model airplane builder. These unusual ships will soar through the air for hours. BACK SWEEP SENTER BES : Beis. RecN, SKY ARROW AS C MRNEACAY Ee Dl I s Dm TEN t “Mandalay”, In this model, though, the back sweep of the wings requires that the eyelets for kite string be located farther back. The “Flying Venetian Blind” is somewhat differ- ent so far as fuselage construction is con- cerned. Here two sheets of zy” balsa are veneered together then cut to shape with a Magazine, May, 1936 THE SAME FUNDA ^ MENTAL. - "ipsu ELEVATION DGE THAN "MANDALAY" sau senor whan EA Sea Stars or vist VEN PN i ANGLES. USE HOT, GLUE AND 4 NIGHT 2 OZ. LEAD, n ko e a Due to large wing surface the Venetian Blind kite should have a strong rubber in the elevator control. Success with depends upon care exercised by . All planes are flown in same manner as ordinary box or cloth tail kite. sharp knife. Four wings are constructed in the identical manner as those used in the other models except that their leading edges are slightly thin- ner. The rubber band on elevator is also heavier than ones used on the other kites. The plane kites are flown in the same man- ner as the conventional tail or box kites. Although a little more difficult to launch than the ordinary kites the planes are not at all difficult to keep in the air. 107

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M akeT hese NOVELTIES with by Dale R. VanHorn HAMMER. g CAREFUL The attractive ink well and dresser box shown above wete turned from colored plastics. Form knobs by tapping short plastic rod into hole in block of wood and attach to the faceplate. ns for the inkstand and dresser box are all in ve schematic drawing. Carefully note method used to keep lead inlay strips from becoming loose from turnings. ‘The base of the inkstand as it appeats near its completion and below, looking into front of nearly completed inkstand. HE surprising adaptability of the new plastic materials and the striking results of the finished articles, makes them ideal for the home craftsman's turned projects. Hard rubber, the first plastic, was confined to one color. Bakelite, the next important plastic discovery, was hard and it did not lend itself readily to easy manipulation in the home shop, but this new plastic can be worked like wood or soft metals, turned in the lathe, bent to shape in hot water, planed, drilled, filed or sanded, and takes a beautiful polish. Besides, every color of the rainbow are available. To get acquainted with it, simple projects naturally come first. A solid color bracelet requires only the obtaining of a short length of 2%-inch tube of the right color. Turn a wood spindle with a slight taper so that the plastic cube can be forced to a snug fit upon it. Then with the proper chisels, round the Above—The walnut base of the-ink stand mounted in the lathe. Below—the dresser box with the lead band inserted in the inlay groove. Modern Mechanix & Inventions Rainbow- Hued PLASTICS Brilliant in color and as easy to work as wood, this new celluloid-like plastic ma- terial can be turned, cut or bent into at- tractive novelties. The projects described here are just a few of the many possible. 4 DIAM.PLASTIC TUBE SHEET PLASTIC SPACE FOR PAPER eae o m s pecker a METAL —» BANDS H SPACE FOR ENVELOPES RUBBER CUT FROM BANDS — », VA'DIAM. RoD STRIPS OF PLASTIC >EE YELLOW, GREEN BLACK OR CLEAR GREEN ÒR YELLOW COMPLETE DESK SET The desk set at left is not only attractive, but very easy to make. Simplest of all projects is the bracelet at right, Several layers of inner edges, round the outside surface to the desired design, and polish. A variation con- sists of sanding four flat sides, evenly spaced and cementing strips of a contrasting color plastics provide designs to these flat areas, using rubber bands to hold are attractive in appearance. them in place until the cement has dried after which the ring is turned down on the lathe. Suggested color combinations are: yellow ring with green or black segments, green ring with yellow or black segments, black ring with yellow or orange segments. An attractive ink well which harmonizes almost anywhere can be made with a small block of walnut, a tube and a small piece of flat plastic. Turn the base to 3 inches in diameter of the design shown and sand, fill and finish with clear lacquer or shellac. Turn the center depression just large enough to take the plastic tube, to a depth of about r- inch. Felt should be glued to the base and the edges trimmed. the lathe whose diameters are that of the inside diam- eter of the tube. One block is cen- tered with the tail stock, the other with the live center. To prevent the flat piece from working out of alignment, drive two short brads in the exact centers of the ad- joining ends of the spindle and file Turn a wood spindle to make a tapered them to sharp, short fit for the plastic tube, work it on to a tight points. The fat fit, and true up the ends, with a length of piece is then placed 1% inches. The outside can be also trued between them and with a chisel, then the polishing wax applied the dead center with a rag to give a lustre. worked up snug The bottom can be any thin flat plastic. [Continued on It is turned between two blocks of wood in page 122] Nails driven into a block of wood attached to the lathe's faceplate will permit turning. Magazine, May, 1936 111

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