Modern Mechanix, January 1937

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j MAIL COUPON How FREE 40-PAGE CATALOG Mail coupon today for new, FREE 40-page catalog...and learn how youcan save up to 50% by buying direct from Midwest factory. See for yourself that Midwest offers today’s greatest radio values, and scores of exciting features, like Dial-A-Matic Tuning, plus Electrik-Saver, With the sensational Dial-A-Matic Tuning feature, for example, even a child can bring in ten perfectly tuned programs in ten seconds. Zip!...Zip!...Zip!... stations come in instantly, automatically, perfectly ... as fast as you can push buttons. The exclusive Midwest Electrik-Saver cuts radio wattage consumption 50%, enables Midwest radios to use no more current than ordinary 7-tube sets, ONLY IN MIDWEST DO YOU GET DIAL*'A- MATIC TUNING pi^ ELECTRIR'SAVER LAU A ea, ELECTRIK-SAVER This exclusive Midwest feature cuts radio wattage consumption 5095 . . , results in Midwest DIAL-A-MATIC TUNING Now, even-a child can bring in ten perfectly tuned programs in ten seconds! It’s a big thrill to whirl the dial... and then hear the station you want... come in instantly, automatically . . . as fast as you can press buttons! than ordinary 7-tube set... enables you fo operate on voltages as low as 80 volts, radios using no more current NNI 927 y Vg f y be 7 N 7 N Ge LX 2G i N A N 77 NN A NN by, N 7 NN 27 b A N 7 EN Ps MINS E f i N a| A | Ñ NN E by | Y MN | ^ 77 S "A | F OR N EW RESIN A | WS 7 | N 7 77 77 ti 50 COMPLETE 22) 18 TUBES TurATRE-SONMC) SIX WAVE BANDS auanei 4% fo 2400 METERS ey LESS TUBES ) z Bigger, better, more powerful, more beautiful, this super deluxe Midwest out-performs $150 sets on a point-for- point comparison. Amazingly selective, delicately sensitive, it bringsin distant foreign stations with full loud speaker volume on channels adjacent to powerful locals, You'll thrill over its marvelous super-performance...glorious crystal-clear “concert realism” . . a magnificent world - wide foreign reception. Powerful Triple-T win tubes’ (two tubes in one) give 22-tube results. You can switch instantly from Ameri+ can programs... to Canadian, police, amateur, commercial, airplane, ship broadcasts . . . to the finest and most fascinating foreign programs. Never before so much radio for so little money. Why pay more? Save up to 50% by buying at wholesale ..direct from factory...preferred by thousands of careful radio purchasers since 1920. TERMS AS LOW AS PN p FREE TRIAL You have a year to pay...terms as low as 10c a day...you secure privilege of 30days’ FREE trial in your own home. In addition, you are triply Biotected, with Foreign Reception Guarantee, ne-Year Warranty and Money-Back Guarantee. J MAIL.COUPON TODAY For £REE 30-DAY SER TRIAL OFFER AND 40-PAGE FOUR-COLOR FREE CATALOG MIDWEST RADIO CORPORATION Dept, G-10 Cincinnati, Ohio Without obligation on my part, send me your new FREE catalog and com- plete setae ofyour liberal 50-day Free trial offer. "This is TOW ...-c.sscsssssssesnseseccenunesscns Siste caisses OT an order, (Special offer and prices prevail only when dealing direct with factory by mail.) ‘Sy SS ws TS PS 2 SS nad a ING —— — —— iii Address i

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Turee hundred and sixty-five days from now — what? Will you still be struggling along in the same old jeb at the same old salary — worried about the future — never able to make both ends meet? One year from today will you still be putting off your start toward success — thrilled with am- bition one moment and then cold the next — delay- ing, waiting, fiddling away the precious hours that will never come again? INTERNATIONAL BOX 2320-K, * Don’t do it, man — don't do it. There is no greater tragedy in the world than that of a man who stays in the rut all his life, when with just a little effort he could advance. Make up your mind today that you're going to train yourself to do some one thing well. Choose the work you like best in the list below, mark X beside it, and, without cost or obligation, least get the full story of what the I. C. S. can for you. SCRANTON, PENNA. Without cost or obligation, please send me a copy of your booklet, “Who Wins and CORRESPONDENCE SCHOOLS * Why,” and full particulars about the subject before which I have marked X: TEGHNICAL AND INDUSTRIAL COURSES D Architect O Architectural Draftsman D Building Estimating O Contractor and Builder D Structural Draftsman O Structural Engineer O Management of Inventions O Electrical Engineer O Electric Lighting D Welding, Electric and Gas O Reading Shop Blueprinta D Heat Treatment of Metals D Sheet Metal Worker D Boilermaker D Telegraph Engineer O Telephone Work O Radio O Mechanical Engineering O Mechanical Draftaman O Machinist O Toolmaker O Patternmaker O Diesel Engines O Aviation Engines O Automobile Mechanic O Refrigeration D Plumbing D Heating O Air Conditioning O Steam Engineer D] Steam Electric Engineer O Marine Engineer OR. R. Locomotives O R. R. Section Foreman O Air Brakes O R. R. Signalmen O Highway Engineering O Civil Engineering O Surveying and Mapping O Steam Fitting O Ventilation BUSINESS TRAINING COURSES O Business Management DO Industrial Management D Traffic Management O Accountancy O Cost Accountant OC, P. Accountant D Bookkeeping O Secretarial Work O Spanish O French O Saleamanship D Advertising O Service Station Salesmanship O First Year College Subjecta O Business Correspondence D Stenography ond Typing O Civil Service O Mail Carrier O Railway Mail Clerk DOMESTIC SCIENCE COURSES D Home Dressmaking D Advanced Dresemaking O Professional Dressmaking and Designing D Millinery O Bridge Engineer Q Bridge and Building Foreman O Chemistry Pharmacy O Coal Mining DO Mine Foreman O Navigation O Cotton Manufacturing O Woolen Manufacturing O Agriculture D Fruit Growing O Poultry Farming O Fire Bosees O Grade School Subjects O High School Subjecta O College Preparatory O Illustrating [1 Cartooning à " D Lettering Show Carda DO Bigns O Foods and Cookery D Tea Room and Cufeteria Management, Catering ihi ——————— DUE, FR PEORES 02 t epp EE Present Position......... Jf you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Canada Lim ited, Montreal, When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions

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PRICE JANUARY 15 CENTS 1937 SAME PRICE Volume XVII IN CANADA Number 3 CONTENTS SPECIAL FEATURES NEXT MONTH Work Starts On MM Home - - - 36 By Wesley Sherwood Bessell, Noted New York Architect Great Inventions of Famous Men - - . 42 By Aubrey D. McFadyen Around the World by Air - - - - - 50 By H. R. Ekins, Reporter, First Man to Circle Globe by Air Lines Behind the Razor Blade - a - ^. . 58 By Robert W. Gordon Sound Tricks of Mickey Mouse E -" - 68 Dr. Miller McClintock, noted Harvard ee authority on tafe regulation; : m tells readers how effective traffic By Earl Theisen, Illustrated by Walt Disney control can be accomplished through en- gineering. His timely article expounds ways and means by which crowded cities can convert their present inadequate Tackle for Salt Water Fishing - - =- 76 highways into thoroughfares featuring mM) for d us and qeu x trians alike. on't fail to read this By Robert Page Lincoln authentic solution to a modern problem. Glacier Priest Maps Roof of the World - - 82 By James N. Miller FOR WORKSHOP FANS Among the highly interesting projects scheduled for the Feb- ruary issue there will be plans for building an Aero-Drive Ice Sled, A an All-Purpose Desk, 2-Tube By Watson Davis Metal-Glass All-Wave Radio, Elec- tric Reactance Coil Experiments, and many other workshop plans, [Continued on page 10] suggestions, and time saving kinks. Bethlehem Opens New $20,000,000 Mill - 86 Published monthly by Modern Mechanix Publishing Co. at Broadway and 11th St., Louisville, Ky., U. S. A. Entered as second-class matter under the act of March 3, 1879, at the post office in Louisville, Ky., with additional entry at Greenwich, Conn. Copyright 1936 by Modern Mechanix Publishing Co. Editorial offices, 22 West Putnam Ave., Greenwich, Conn. Address all manuscripts to Modern Mechanix Hobbies & Inventions, at the Greenwich, Conn., address. Not responsible for unsolleited manuscripts. Contributions accompanied by insuffleient postage wlll not be returned. In U. S. and Possessions and in Canada, lic a 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, 1014 Russ Bldg.; Los Angeles, Simpson-Reilly, 536 S. Hill St. Member Audit Bureau of Circulatlons, Managing Editor, William Kostka; Edltor, Tom Mahoney; Associate Editors, Thomas A. Blanchard, John L. Scherer, Walker Matheson; Hunting and Fishing Editor, Robert Page Lincoln; Naval Architect, S. S. Rabl. 4

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1938 1939 1940 1941 1942 1943 1944 D ERU 1945 Will You Be Clerk or Manager 1046 — 1047 " The leaders of the next ten years will largely be deter- mined in the next ten months. Will you be one of them? Ten Years from Now? “that I should be sitting at the same desk—hbe doing the same work—for ten straight years!" But wait a minute— Exactly that same thing has happened to thousands upon thousands of men. It has probably happened to men right in the company you now are working for. And —uwunless you fit yourself for a better y wes is @ very good chance that it may happen to you. Unthinkable? That’s what J. N. Dixon of Columbus, Ohio, said to himself. Yet lack of training kept him slaving away at low wages for a long time. TRIPLES INCOME Bere is Mr. Dixon's own story—‘Just after I returned from the war, one of your representatives found me lugging away at a bookkecper’s job in Marietta, Ohio. Fe performed a real service and explaincd to me the necd of further training, and induced me to take the LaSallo training in Higher Accountancy. After a few months of study, T secured a position with the Trust Department of a National Bank. This was the stepping stone I needed to various responsible positions including handling of receiverships and other important duties. That quickly boosted my income several hundred percent.” ANOTHER AMAZING SUCCESS STORY If you think Mr. Dixon's success story unusual, please read what J. H. Krouse of Memphis, Tennessee, says. “When I decided to take your training in Higher Accoun- "Geter this could never happen to me," you say— tancy, I was a clerk. Today I am Chief Consultant Ac- countant for the U. 8. Engineer's Office in Memphis, Tenn. Whatever success or recognition I have had, I owe to your training, I have had no other specialized training along this line. Your method of teaching is not only instructive but highly engaging. I have observed other courses, but firmly believe LaSalle has the best to be had anywhere,” Another bit of proof is Mr. R. P. Barthalow’s experi- ence. Mr. Barthalow is Chief of the Sales Tax Section of the Tax Commission of Ohio. A department which handles over $50,000,000 a year. Mr. Barthalow attrib« utes much of his success to LaSalle training. SEND FOR These Two Books and Start Toward Bigger Success Need you hear more before you investigate the oppore tunities in Accountancy? Or will you face the problem of your future NOW— and send to LaSalle and get further facts and particulars? "Without cost or obligation, the coupon will bring you two interesting books—one a 64-page book entitled, “Accountancy, the Profession that Pays’; the other “Ten Years’ Promotion in One.” How about those next ten years—will you wait or will you START TODAY to realize the tremendous oppor~ tunities that lie ahead of you through sound and practical home-study business training? Measure your grit and ambition by what you do with this coupon—NOW, LaSalle Extension University LASALLE EXTENSION UNIVERSITY, Dept. 1493-HR Opportunities in Accountancy—Check below and we will send you a copy of “Accountancy, the Profession that Pays," also copy of “Ten Years’ Promotion in One," all without obligation. : CHICAGO i i i tant, | O Higher Accountancy: Leading to position as Auditor, Comptroller, Certified Public Accountan : Cost Accountant, etc. Other LaSalle Opportunities: If more interested in one of the other fields of business indicated below, check that. OBusiness Management ULaw: Degree of LL. B. D Stenoty py. GExpert Bookkeeping OlIndustrial Management O Business English OC. P. A. Coaching O Personnel Management O Commercial Law DModern Salesmanship O Modern Business Correspondence OEffective Speaking D Trafic Management Name ...-.200-- 2-2-2 2-20 - 2 - awn ee ne nen nnn nn een eee n ane ee —————ÓÓ———ÀÁ ssa Present Position......------------------------------ C LU R—ÁX—— When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 5

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dicasting orator Broa chief Op Station I leted 20, lessons, T Sy's «when I comp? deast Operat? tained my Radio ately Soimed, Station now e and il a 5 HOLLIS pg. BAYES, 85 M* Stes ‘Lapeer, Mich. id Week in Spare Time y work has consisted of i Eervieing, with some Publio Aio Set petema work--all in my spare time f dy rH anio amount to about | week." WILLIAM 705 Ridge Road, Hobart, Ind” anager For Four Stores 3 ey was working, in a garage when enroled with N. R. L fe the months I made enough to pay Aes course three or four timis the Mt Radio Se D i their four stores." Furniture, CO RYAN, 1535 Slade Bie Fall River, Mass. 4 Service IM Own Business P. a Month >> 3300 m I now have whi z ati REESE $9 Ne ia, Penna. Earned $50 First onth in Spare Tims. PE i ut Radio. f Mis note abotervicing Radios un tne iu: month. earn’ winter an spare time. West Olney Ro Accept No Substitutes! DIC ANY MAKE 50575 A WEEK | Will Train You at Home— mail coupon for FREE Book Do you want to make more money? Radio offers you many opportunities for well-paying spare time and full time jobs. And you don’t have to give up your present job or leave home and spend a lot of money to become a Radio Expert. Many Radio Experts Make $30, $50, $75 a Week Radio broadcasting stations employ engineers, operators, station managers and pay up to $5,000 a year. Spare time Radio set servicing pays as much as $200 to $500 a year— full time johs with Radio jobbers, manufacturers an dealers as much as $30, $50, $75 a week. Many Radio Exe perts operate their own full time or part time Radio sales and service businesses, Radio manufacturers and jobbers employ testers, inspectors, foremen, engineers, servicemen, paying up to $6,000 a year. Radio operators on ships get good pay and see the world besides. Automobile, police, aviation, commercial Radio, and loud speaker systems are newer felds offering good opportunities now and for the future, Television promises to open many good jobs soon. Men I have trained are holding good jobs in these branches of Radio. Read their statements, Mail the coupon, There's a Real Future in Radio for Well-Trained Men Radio already gives jobs to more than 300,000 people. Ta 1935 over $300,000,000 worth of sets, tubes and parts were sold—an increase of 20% over 1934! Over 1,100,000 auto Radios were sold in 1935, 25% more than in 19341 22, 000,000 homes are today equipped with Radios, and every year millions of these sets go out of date and are replaced with newer models. Millions more need servicing, new tubes, repairs, etc. Broadcasting stations pay their em- ployees (exclusive of artists) more than $23,000,000 a year! And Radio is a new industry, still growing fast! A few hundred $30, $50, $75-a-week jobs have grown to thousands in less than 20 years! Many Make $5, $10, $15 a Week Extra in Spare Time While Learning Practically every neighborhood needs a good spare time serviceman, The day you enroll I start sending you Extra Money Job Sheets. They show you how to do Radio repair jobs that you can cash in on quickly! Throughout your training I send you plans that made good spare time money —$200 to $500 a year—for hundreds of fellows, My train- ing is famous as “the Course that pays for itself.” THE TESTED WAY TO Always Insist on the Advertised Brand!

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EXPER Set Servicing Spare time set servicing pays many $5, $10, $15 a week extra while learning. Tull time servicing pays as much as $30, $50, $75 a week, Broadcasting Stations Employ mana- gers, engineers, operators, instal- i Give You Practical Experience lation and main- tenance men for My Course is not all book training. I send you special fascinating jobs Radio equipment and show you how to conduct experiments and pay up to and build circuits which illustrate important principles used $5,000 a year. in modern Radio receivers, broadcast stations and loud ` speaker installations. I show you how to build testing ap- paratus for use in spare time work from this equipment. This 50-50 method of training makes learning at home interesting, fascinating, practical. You Get a Money-Back Agreement I am so sure that I can train you successfully that I agree in writing to refund every penny you pay me if you are not satished with my Lessons and Instruction Service when. you finish. I'll send you a copy of this agreement with my Free Book, Find Out What Radio Offers You Act Today. Mail the coupon now for “Rich Rewards in Radio.” It’s free to any fellow over 16 years old. It de- scribes Radio’s spare time and full time opportunities and those coming in Television; tells about my training in Radio and Television; shows you actual letters from men I have trained, telling what they are doing and earning. Find out what Radio offers YOU! MAIL THE COUPON in an envelope, or paste on a postcard —NOW1 J. E. SMITH, Pres., National Radio Institute, Dept. 7AH Washington. D. C. Loud Speaker Systems Building, installing, servicing and operating publie address systema is another growing fleld for men well trained in Radio, Automobile Radio Another new Radio field — selling, installing, servicing. One milion or more auto owners will install radio sets withe in the next year. y Mr. J. E. SMITH, President, Dept. 7AH National Radio Institute, Washington, D. C. Dear Mr. Smith: Without obligating me, send “Rich Rewards in Radio,” which points out the spare time and full time opportunities in Radio and explains your 50-50 method of training men at home in spare time to become Radio Experts. (Please Write Plainly.) NAME wacsssccssstarcoseacsre ——— Clo — CITY A —— ——— E ÉEÁBRÉÁAE:U: Ey saseonsenssonss When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 7

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Since the ‘‘Horseless Buggy" Days, We Have Helped Inventors pERHAPS you have already heard about our firm, because one client tells another —and we have served men in every state in the Union, and in nearly every foreign country, We have been working with inventors since 1898. If you have a good inven- tion—or an idea for one—and don't know what Victor J. Evans & Co. can do for you, NOW is the time to find out, How We Can Help You Both the Patent Office and the U. S. Supreme Court have made it clear that the inventor needs the assistance of a competent patent lawyer when it comes to protecting an invention, It is one thing to think up a good invention—it is another to get effective patent protection on it. For more than a third of a century —it has been our business to give sound advice and counsel to in- ventors. Our free books (described on the opposite page) tell what steps to take first, how to protect your- self, how the laws protect you, what you must do, when to offer your in- vention for sale, how others have succeeded, and much more. You need this information. Simple inventions May Have Excellent Com- mercial Possibilities FREQUENTLY inventors confuse the size or the complication of a device with the question of commer- cial value and patentability. These two factors, of course, have no re- lation to each other. Most of our present-day complicated machines represent a process of evolution, a series of inventions. On the other hand, every so often some inventor comes along with a very simple "gadget" which possesses the ele. ments of broad utility and is patent- able. Some of the most profitable in- ventions have been of this latter class. Shown above are a few such examples. Whether a device is simple or complex, if it represents a forward step to save manufacturing costs, to save labor, or to add enjoyment to human life, it may prove patentable and profitable. This subject is more fully discussed in the booklet en- titled “Patent Protection" shown on the opposite page. ae DAVID SARNOFF, once a poor lad and now the famous President cf the Radio Corporation of America, in an article in Liberty Magazine states: “Civilization means elimination of un- necessary labor, The sewing machine and the vacuum cleaner save millions of women from backbreaking toil. The tractor makes the farmer's life bear- able. The automobile lends wings to us all. The airplane is our magic carpet. It would be madness to slow up invention because our trouble is not that mechanical science moves too speedily, but that the governmental and social sciences move too slowly . . . In a world reorganized to vibrate within certain wave bands, human intelli- gence will be able to distribute equitably nature's bounties from above and below, and make princes of paupers,” What Will Be Next? EVER since George Washington signed the first patent, America has led the world in inventions. It may be said that not a year has gone by without some important inventions being patented and commercialized. David Sarnoff, president of the Radio Corporation of America, sees a big future ahead for science and inven- tion. Just as sure as the sunrise, 1937 will see new inventions come out— new wealth made from patents. Your idea may be one of them. You never can tell For this reason you should send for our books today and get the facts about patents and inventions. 8 Accept No Substitutes! Always Insist on the Advertised Brand!

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These FREE books tell you Get the answers to your questions: How can I protect my invention? When can I show my invention to manufacturers? When can I offer it for sale? How should I go about selling it? Can I get protection with- out a patent? What are my em ployer's rights? These and other im- portant questions are fully answercd. Learn how our patent laws protect you The U. S. has liberal pat- ent laws, and much of our national wealth ` is based on pat- 3 ents. In fact, a Japanese com- mission decided that American progress was Tnainly due to our patent laws. These laws are made to protect you. Find out about them now. This is for your own good. Mail Coupon Today Delays are dangerous. If you have a good nvention you should get protection for it just as soon as possible. Don't turn this page until you have clipped and mailed this coupon—you will hear from us by return mail. 5 Afonadnotk rk; 4445-B, A nadig- aneian; 1010-B» Hobar! * è d 1 1ag-> les. eNvShen B Te Ange son’? and A . A other Offices: . 511-B, Empl Bldg. Les rotection” BM py any 115 Mechanical Principles Tag, Chicago: 36m, Security cies, "patent Tots supplied San Francise EE copies of your (Nate: Same gend me FRAY an Invention Shown od ened taces listed above.) M di Request the book “Patent Protection" (sent free i 9 mee to inventors). Not only does it tell you what to do — T porti 115 diferent mechanical movements that you may n use in developing your own inventions. Inventors street and Nos ee pareret ni tell us they have found these useful. MNT mm um NES MED RENS DENS ee ee city or Town > for protection, and how to do it—it also shows you i Name When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 9

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BROADCAST and AMAZE Your Friends! Put on your own broadcast with the WALCO MIKE, most entertaining radiodeviceyet produced, Sing, laugh, talk, crack jokes [from another room and your radio will produee every sound as though you were miles away at a regular broadcasting station. Marvelous Fun at Parties Imitate the big radio stars and crooners, Do a “Ben Bernice” or “Rudy Vallee.” No end of pleasure for grown-ups or kiddies. Excellent training in elocution, “Amateur lo practice, or broadcas' announcing. Special cut-out button allow you to switch from home broadcasting to regwar radio reception in au in- stant. Can nol injure your radio in any way. Send No Money 5 Days Trial at Our Risk THE WALCO MIKE In handsome EE metal. Long ON Merely mail the coupon, On ou delivery pay postman $1 Plus Fully few cents postnge. If not de- guaranteed. lürhted return it in 5° days and your $1 refunded at once. -- um us mm um GN NN um END OS UD E UU UR GU Ur imd UU m UU UNO GOOD UR m ELECTRICAL LABORATOR ES CO., Dept. 61 49 East 21st St., New York, N. Y. Send Walco Mike, with complete instructions. Wl] pa ay postman $1, plus few cents postage. If not delighted, will return in 5 days for $1 refund. g Check here if ENCLOSING $1—thus saving postage charge. Same refund guarantee applies. MU ana a RA cee See cack Address seire ein e e a a a a a E a a eens Oo Check here If you preter chromium plated De Luxe model. Price $1.39 FUN for EVERYONE Not a feeble crystal set. Thou- sands now In use. Can actualty bring in foreign stations police calls, acroplanes, amateurs, etc.. as well as local broadcasts! Ace Radios give guaranteed results! For only $1.55 we send you the complete kit containing an attrac- tive metal chassis panel and every part needed to buiid a powerful inet iube receiver, AMAZING VALUE! Wor for months on two inexpensive dry batteries. Our clear diagrams make it simple to hook up. (Set laboratory assembled and wired 75e extra). Send for your ACE Ttadio ACE RADIO LABORATORIES, 70 Barclay SL, Dept. MX-1, New York GENUINE -ARF€O> CUTTING TOOLS GIVE YOU SATISFACTORY SERVICE Special Offer 6 different cutters as shown; steel for filing, ing, cutting, engraving ll woods, plastics, yf on B. metals (sx 11/57 shanks). Fit all hand grinders and stationary machines. Keen, sharp edges. When prepaid we pay the postage. stock in America. REE BOOK Dealers get our prof- itable proposition. AMERICAN ROTARY TOOLS CO., INC. 44 Whitehall St., Dept. C-5, N. Y. City SOME CURRO TNOS SHORTER FEATURES Chemists For Industry—-A Guest Editorial - 35 By Emile F. du Pont, Personnel Manager, E. I. du Pont de Nemours & Co. Proving Women Also Have Ideas - - - - 46 Last Minute Gift Suggestions - - 48 Love Of Man For Dogs Expressed In Building Canine Cemeteries - - - 55 More Marvels In 1937 Cars - - - = - - 56 Are We Drifting To China? - - - - - - 57 Women Head Winner's List in MM Inventions Contest - - - - - = 62 America’s Newest Auto Race Track - - - 64 Aerial Medical Service - - - - - - - 66 Fancy Skating - - - ~ - 74 Workshop Fan Builds Attractive Home - - 8 Harbor Tugs Talk To Shore By Phone - - 84 Micro-Test Your Car’s Cylinder Oil - - - 113 HOW-TO-BUILD FEATURES Tiny Amplifier Features Metal Tubes - - 90 Extend Holiday Greetings With Outdoor Decorations - - - 94 "Jumping Jeff"—A Tiny “Tots Toy - 97 Tiny Hand Power Grinders Simplify Model Carving - 98 Build Thriller "poboggen Slide - = = - 100 A Christmas Circus For Kiddies - - - - 101 Completing The Model Mayflower - - - 102 Generator Makes Gas For Cooking - - - 108 Spin Metal Projects On A Lathe - - - 110 INTERESTING SCIENTIFIC ITEMS Pilot Uses Inflated Suit On Record Altitude Hop - 47 B Girl Raises 15, 000 Chickens ‘th “Indoor Cages - - - - - - - - 63 Television Phone Links Two German Cities 67 Electrical Stethoscope Helps Doctors Diagnose 73 Iodine Vapor Pipe Detects Fingerprints - 79 Bureau Of Mines Opens First Hydrogenation Plant - - ---- 85 Explorers Use Amphibian Plane - - - = 8 Grandfather Wins Air Race - - - 88 NEW MECHANICAL INVENTIONS Huge Machine Builds Road In Single Opera- tion - - 40 Typewriter Has 2,000 Keys -7- - - 40 College Has Study Enforcer Machine - - 40 Air Commerce Bureau Adopts -Radio Type- writers - - ---- 41 Blind Man Remodels. Home - = = - - 41 Newsboys Wear Neon Signs - - - - - 41 Pullman Cars Go Modernistic - - - - - 47 Saddle Clamp Is Removable - - - - - 47 Auto-Yacht Features Aluminum Hull Con- struction - - - - s. 49 Blow Torch Thaws ‘Switch - - = = - 49 Machine Aids Beet Farmers - - - - - 49 Russian Invents Double Recording Dises - 54 Bus Ads Shown On Screen - - - - - 54 House Shaped Like Elephant - - - - - 63° Locomotive Pulls 100 Cars - - - - - - 63 Ladder Aids Fire Laddie - - - - - - 67 Fastest Transport Plane - - - - - - 67 Device May Stop R. R. Crashes - - - -B [Continued on page 14] Accept No Substitutes! Always Insist on the Advertised Brand!

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Beginning Lessons in | Diesel Engineering fast-growing new line of work. Diesel — Is Your Job Safe? Just as the gasoline engine 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 Dieselengineisfast invading both the power and transportation fields, and threatening the present jobs of thousands of workers. If jobs in your line are steadily growing scarcer, you owe it to yourself to investigate this new, in our opinion will offer good openings for the next 25 years. Test Yourself Without Cost See how readily vou, too, can Learn Diesel At your leisure in your own home, read these 2 Diesel lessons carefully. Judge for yourself our ability to teach—and your ability to learn—this No Previous Experience Necessary See for yourself how practical American School train- ing is—how clearly every fact is presented—how thoroughly you can master Diesel through home study. the New, Fast-Growing Power changed or wiped out the jobs ! progressive, uncrowded line, that | Diesel engines— because of their high efficiency, dependability, and economy of operation—are fast replac- ing steam and gasoline engines in power plants, motor trucks and busses, loco- motives and ships, aircraft, dredges, drills, pumps, etc.—opening up an in- creasing number of well-paid jobs for Diesel-trained men. The field of Diesel Engineering is on the upgrade and con- tinually expanding. It will provide steady employment, advancement and good pay for those properly trained in this new industry. What This New Fleld Offers You Now is your chance to get into a big new industry and grow up with it to an important position. Today there is practically no competition in the Diesel field, but the increasing use of Diesel engines will result in keen corapetition for jobs in the near future. By starting your training now, you American School, Dept. D-128, Drexel Avenue at 58th Street, Chicago The Diesel .and four-stroke cycles; low- and high- Diesel Engines Sentio and Mine dz rae | Deren Leda i Joss Bay: Fame s Hi i PORE uus by : eti Mu Pasir iss ee ewe a Hosoi 2 Aterian Selig pou can keep ahead of such competition. You get complete information on all the latest Diesel developments—two- speed and heavy duty types; Diesel- electric generating systems, etc.—in our course. Includes all text material —with special diagrams for quick un- derstanding of this new power. Real Opportunitles for Tralned Men Get our Free Diesel Booklet and learn all about this new, fast- growing line—its opportunities and re- quirements. Find out what the Diesel field offers you—how rapidly the Diesel industry has developed during the last three years—the large number of Diesel engines and accessories being manu- factured today—how quickly you can obtain a complete understanding of Diesel engine principles and operation by home study during your spare timel ...B8t your own pace—without inter- fering with your regular work. Get These 2 Diesel Lessons When you learn what worthwhile op- portunities Dicsel offers and how readily you can cash In on them through Amerl- can School training, it may mark the turning point in your life. Asking for full information involves NO obligation —so write TODAY for FREE lessons and FULL information. Free Lesson Coupon American School, Dept. D-128 Drexel Ave. at 58th St., Chicago WITHOUT obligation, please send me 2 beginning lessons in Diesel Engi- neering FREE. They are to be mine, to keep. Also send FREE Diesel booklet. When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 11

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Small der ; : THAT HAVE BUILT BI BUSINESSES G INVENTIONS do not have to useful, widely popular, greatly profitable, and extremely successful inventions have been very simple ones. You have only to look at be complicated to be profitable when Patented. The 5c and 10c stores flourish on simple Patented products which are commercially successful. The zipper, safety pin, thumb tack, paper clip, collar button—all simple, yet familiar inventions—brought their in- ventors rich rewards. If you have a Patentable invention—act to protect it. Many of the most the devices we have pictured here to realize how a simple invention may become a utility bought by a hundred thousand or a million people soon after itis produced. Don't be afraid that the sim- plicity of your invention makes it valueless. The thing that you find so simple that you wonder why a thousand other people haven't already done it is often the invention worthwhile. HOW OTHER INVENTORS GOT STARTED The list of men who succeeded in in- vention with only a poor boy's start is a very long and noble one. Poverty, hardships, lack of friends, distance from the market—these could not hold back Bell, Edison, Eastman, McCor- mick, Whitney and others, Everyone cannot succeed. But every man can try. Courage, sacrifice, and hard work may bring you a measure of the suc- cess these men had. Lack of mechani- cal ability is not a serious draw-back. You can always get someone able to build a model, draw a detailed design, or otherwise materialize your inven- tion for you. The big draw-back is discouragement. Your invention of a practical article or an improvement upon an old one should be patented NOW. Frequently many of the thousands of applications filed in the U. S. Patent Office each year are for the same or almost the same invention. In such a case, the burden of proof rests with the last ap- plication filed. Sometimes a delay of even a few days in filing the applica- tion means the total loss of the patent. LOSE NO. TIME. The entire time of this large and ex- perienced organization is devoted ex- clusively to patent and trade-mark cases. We know the rules and require- ments of the Patent Office. We under- stand the technicalities of Patent Law. We can proceed in the quickest and safest ways in preparing an application for a patent covering your invention. THE BIOGRAPHY OF GEORGE EASTMAN Views of the man who used Patent Protection to amass millions and give perfection to a CLARENCE A.OBRIEN & HYMAN BERMAN new art—Photography—itself one of the greatest inventions. 317-S ADAMS BUILDING WASHINGTON, D. €. Registered Patent Attorneys Before U. S. Patent Office Accept No Substitutes! Always Insist on the Advertised Brand! 12

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If you have an invention that is patentable—and want to secure for yourself your inventor's sole right to profit from the invention—you can't afford to lose time in securing the protection of a U. S. Patent. Other inventors may be working on the same invention right now. Should they develop this invention and file patent application before you do—the burden of establishing priority will be upon you. Our Big Book—"Patent Guide for the Inventor’—will tell you the quickest possible way to secure Patent Protection for your invention. The First Important Step in Securing a Patent is to obtain the services of a Regis- tered Patent Attorney. The U. S. Patent Office advises that you secure the aid of an experienced Registered Patent Attorney to prepare your statements. Establish the date of your invention as explained in our book and disclose your invention to him in correct form. He then makes a SEARCH of the Patent Office Records and reports to you on existing U. S. Patents which might bear on your invention, giving his opinion on the advisability of proceeding and filing formal application. Reasonable Fees—Con- venient Terms Don’t worry about finances. Our fees are very reasonable—we can arrange convenient terms of pay- ment. It is our custom to permit clients to pay for our services in in- stallments as the application pro- gresses in our office. See our Big Book for fees in obtaining Patent. It explains our arrangements clearly. Send for it NOW! SEND FOR IT TODAY! FREE RECORD OF INVENTION FORM Use our Free “Record of In- vention” form to assist you in recording the descriptive out- line of your inventions and to establish the date of your in- vention. With it you can make a rough sketch of your invention and have it wit- nessed in a manner of value to you as evidence should occasion arise. 7 CLARENCE A.O’BRIEN € HYMAN BERMAN | (317-5 ADAMS BUILDING | WASHINGTON, D.C. REGISTERED PATENT ATTORNEYS BEFORE U.S. PATENT OFFICE Please send me at once your Big Free 48-Page Book, “Patent Guide for the Inventor” and your Specially Prepared “Record of Invention” form. Also George Eastman Biography, “Inventor and Business Man.” This request does not obligate me. Doc p —————————————— ADDRESS e ———————— — MET TS L » (Please write or print plainly) J When Answering Advertisements Please Mention January Modern Mechauiz Hobbies and Inventions 13

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13 Tells How to Earn (70930450 77 ELECTRIC REFRIGERATION and AIR CONDITIONING Think, Man! Two new rapldly growing industrles offer the very opportunity you nre looking for. Blg Pay, Fascinating d Work—a bright Future. Where would you be today If you had been able to cash In on onc of tne opportunities of- fered by the Radio and Automobile In- dustr.es when they were new? Think j how men's salaries soared—how ''be- ginners’’ were skyrocketed into perma- nent prosperity. MEN NEEDED NOW RIGHT NOW there are new jobs for thousands in Electrle Refrigeration and Air Conditioning. Prepare for your op- portunity at home in spare time by U.E.I.'s low-cost, easy-pay plan. Learn Engineering, Estimating, Installation d and Servicing under a system that has take your course was one of brought outstanding results for TEN the ,,MiSest things I ever| YEARS. Get practical experience in did. L. E. C., Calif. one of our large, completely equipped “Called on Mr. W. of the Laboratories, where you'll learn by do. Tacel peniiseration company ing. u OU PREPARE and the fact I had trainng| LET US HELP Y Mr w (ru rm T glad FOR A BIG PAY JOB ls a U. E. I. grad- uate." W. F., L., Mich. U. I. trained men are now employed by Meaning manufacturers, distributors “Secured employment with] and service organizations, U. E. I. Em- C. & 5., one of firms to which ployment Service offered FREE of extra you referred, me , taking} cost. What it has done for others it full charge of Service Dc-|can do for you. Mail Coupon for Book partments?” R. R. W., Ill. | of Facts about your opportunity. UTILITIES ENGINEERING I. TRAINING U. E. Helps Men Get Jobs “Got job with Mr. H., one of the men to whom you wrote letters . . . signing up to “Am now employed by Frig- idalre in charge of assembly of Self. pconia ped. room cools INSTITUTE ers . . . would never have made it without your train- Established 1927 pne T S Ss Ontos Maon-410 N. Wells St., Dept. 217, Chicago, NI UTILITIES ENGINEERING INSTITUTE, Dept. 217 400-410 N. Wells St. Chicago, ITI t DAP | Please send me your Free Book telling about MY opportunity in Air Conditloning and Electric Refrigeration, I have marked the one that interests me most. | B Air Conditioning D Etectric Refrigeration | NAME 2--2czliMLucezEnenceceumcuiued eiiim Eme ci sen ADDRESS l--newuduckuewesznusudue- urs ymabuse eee | | OMY CR STATE .--.---. -=. | Explore the World on Air Waves with the NEW 1937 Radios by HAMILTON Long and Short Wave Forelgn and Local Broadcast Police Calis—Code Airplanes—Amateurs $ 50 5to11tubes 14; Su perhoterodyne up 16.7 to 2140 meters Marvels of appearance and per- formance! HAMILTON Radios are designed to compete with sets selling et twice-prices. Latest engineering features. Airplane dials. Wonderful dynamic speakers. Micro- sharp volume control. Hairline selectivity. Each beautiful walnut cabinet suggests a perfect Christ- mas gift to some dear one or to yourself! HAMILTON SPECIALTY COMPANY 135Lockwood Ave., Dept. M, New Rochelle. N.Y. Sendfor new catalog showing 10 latest designs 14 Accept No Substitutes! CONTENTS—Continued from page 10 Boat Devised From Scraps - - - =- - - 73 Huge Pineapple Is Water Tank - - - - 79 Street Cars Run On Trackless Bridge - - 79 Vibrator Tamping Machines Develop Great Power =- -= - - - = = = 80 Converter Aids Lathe Work - =- = = = 80 Dry Battery Provides Power - = = = = 85 Floating Aerodromes Speed Trans-Ocean Flights - - - ---- - =- - 88 FOR THE WORKSHOP FAN Spool Is Automatic Switch - = - - - 89 Chart Identifies Resistors - - - - - = 89 Polish Bottle Is Handy Torch - - - - - 89 New Ideas For The Radio Fan - =- = = - 92 Workshop Hobbies - - =- = = = = 9 Decorate Woods With "Sugi" Finish - - - 93 Gun Catapults Toy Planes - - = = = = 93 Pipe Fittings Form Modern Desk - - - - 96 Utilizing Home’s Odd Corners - - =- = - 96 “Mike” Lamp Serves As Radio Decoration - 109 Magnet Opens Secret Lock - - = = = ~ 109 Tips For Modern Motorists - - - - DEPARTMENTS Solving The Readers’ Problems - - - 18 Random Chips From The Editor's Workbench 24 Nic Sprank's Science Oddities - - - - - 34 Radio Sparks And Electrical Experiments - 89 Camera Puzzlers = - = - = = = ~ - 116 With The Hobbyists - - =- =- = = - - 148 New Business Ideas - - - =e = = = = 154 MAYFLOWER SHIP re authentic looking model of the famous ship MAYFLOWER is an ideal project for the shop man, hobbyist or model fan. The last installment on the construction of this ship appears in this issue of Modern Mechanix Hobbies and Inventions on pages 102-107, A complete set of full scale blueprints are available for those who wish to build the May- flower. These plans will be of great assist- ance to all who plan building this model. The complete set is available, including materials and supply source list at $3.00 postpaid. Send all orders for blueprints to: MODERN MECHANIX PUB. CO. Fawcett Building. Always Insist on the Advertised Brand!

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Delta offers a complete range of motor-driven tools for home work shops, small shops, factories, and builders. Prices are low enough to be well within the reach of the home craftsman. Yet the quality, sturdiness and accuracy of these tools make them ideal for the steady heavy grind of production work. Delta tools are in use in tens of thousands of shops, small and large, all over the world. Find out why. Send coupon be- low for complete 1937 catalog. New 10-Inch Band Saw Has balanced enclosed disk wheels, running on New De- parture double-seal ball bear- ings, patented table swinging on widely-spaced double trun- nions, micrometer adjustment NEW 4-INCH JOINTER guides and ball-bearing blade supports above and below tne It has the patented fence that insures sure, free action and table, with the lower-guide unvarying accuracy of the settings, patented swinging stop adjustments brought Qut to with its individually adjusted stop screws, swinging dual- venience and safety — and a control handle that makes control of the fence so convenient. full 6" capacity under the Double-seal ball bearings, of course, and dovetailed ways blade guide— where you need for the tables. The ideal tool for the man who wants the TEPANI In a Bind Saws. best and who requires only 4-inch capacity. Many New Tools — New Improvements The 1937 Delta line incorporates many new tools, new im- provements, new accessories—of interest to every man who works with tools, The complete Delta line includes Drill Presses, Circular, Band, Scroll Saws, Lathes, Shapers, Sanders, Grinders and full line of accessories, Send for 1937 Catalog It is crowded with interesting illustrations and descriptions of the complete Delta line. Points out in detail the important features of Delta design. And also the new 32-page book No. 3 of “Practical Delta Projects" crowded with new and out of the ordinary” things to make—with many photo- graphs, working drawings, and easy-to-understand illustra- tions. Simple, complete instructions make every project easy to follow. Every woodworker should have this book. Send 10c with coupon for Delta Project Book No. 3, 1937 Delta catalog mailed postpaid, New 17-Inch Drill Press The greatest drill press value ever of- fered, Ilas scores o unusual features. Get the full story in the 19347 Delta catalog. New 6é-Inch Belt Sander 5» Has numerous new features including complete double- sealed ball-bearing equipment, full 6 inches of sanding width. Operates in both vertical and horizontal posi- tions. VOELTA MANUFACTURING CO. Dent Mia? | DELTA MANUFACTURING CO. Dept. M137 600-634 E. Vienna Ave., Milwaukee, Wis. I enclose 10c (stamps or coin) for which please send me I one copy of the new 1937 Book No. 3 of “Practical Delta I Projects." Also place me on your mailing list to receive i 1937 Delta catalog of quality motor-driven tools. I am interested iu Delta Tools for: [| ; [| , [| || || T none Shop O Industrial Use O School Shop O Í D : i » I I I [| [| 600-634 E. Vienna Ave., Milwaukee, Wis. I... 2... IMPORTANT: Outside of the United States and its possessions, . i Delta Tools are known as “TAUCO” Tools. Tauco tools are H jo — Ó———— Lr — — i identical in every respect to Delta Tools. ( ) Check here if you are a Delta user now. Cee a LLL LE ESXLUSI ns ee SS es sl When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 15

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MESSY GLUE POTS THING OF THE PAST Men who know their wood-working ;..experienced craftsmen... have dis- covered that mixing glue in messy old-fashioned glue pots is a waste of time. The modern way, the sensible way is to buy LePage's Liquid “all purpose" Glue in handy cans. Le- Page's guarantees lasting strength. LePage’s joints practically "weld" the wood. Ideal for veneering and in- laying. Makes snug joints, reinforces nails and screws, fills small cracks and nail holes. Use LePage's—and the job is permanent. All hardware and drug stores sell LePage’s Liquid Glue in the tube, bottle or can. There is no need for any homecraftsman to be without it. LePage’s Adhesives, Laboratories and Factory, Gloucester, Massachusetts. AGE'S GLUE

BOICE-CRANE Toots ron 1937 described in BIG, NEW Catalog! The Finest Saw We've Built

'Tilting-Arbor'* sawlng is in a class by itself. The finest tilt- table built can't ever equal E. its performance. Behind this Ð new 1937 B.C Saw is six years of con- stant improvement.

Patented! Time Proven!

NEW! NEW! All-Purpose Bell Sander Don’t make the mistake of wasting hard earned $$ on small impractical Sanders, Buy this new improved B-C that han- aieo ks Practical Wet Tool Grinder Few $8 buys it, Extralife from hand tools pays for it. Uses time-proved wet wheel.

a n widths of stock.

Get Your Copy of This Big FREE Catalog Now! BOICE-CRANE CO., Dept. MX. 1-M, Toledo, Ohio SAWS - JOINTERS - LATHES - DRILLS - SHAPERS - SANDERS - JIG-BAND SAWS 16 Accept No Substitutes!

EVERY TOM DICK 4 HARRY, WILL BE WORKING g VOU WHATTA LIFE—you have the gas station attendants, the waitresses, parage men, labor- ers, railroad men, as a matter of fact, every Tom, Dick & Harry telling your story and everybody’s interested. It’s really fun! And do you collect prof- its!!—we mean Big Money! Your helpers are well aid too—but not by you—we take care of that. etter write for this interesting big money plan toe day—right now so you will be first, GARDEN CITY NOVELTY CO. 4386-C Ravenswood Ave. Chicago lll. ~ Build YOUR OWN Wind Driven Light Plant from old auto generator. We show you how. Make money building for others. Light your buildings, play ~

radio, operate washing machine and other molors. Dime brings complete plans and 1937 catalog. Over 50 other changes for 6-12-32 and 110 volt plants. Satisfaction Ine guaranteed. Write today. LEJAY MANUFACTURING CO. 14i4 W., Lake Street Minneapolis, Minn, 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. Allfor10cents. OUTDOOR ERTERPRISE CO., 113 Main St., New Clty, N. Y.

Oe eae RAP RP E MAKE MONEY PRINTING letter and billheads, circulars, cards, for <P) friends, spare time. Easy to learn. Easy to get jobs. Printing Presses, $12; new type, complete supplies, lowest prices. Send stamp for catalog. 4 PEIFFER CO., 95-A 6 Columbia St., Newark, N. J.

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 PUBLISHING CO. GREENWICH, CONN.

Bell Improved Leather] . ON'T waste effort on second raters, Sell fast and repeat Ties. on handsomest Improved ties. Rich colors, embossed like silk. Fullest cut; long wear; wrinkle-free. Wipe clean like new with dam cloth, Send $0c for sample tie (65e value and Big Free Sales Kit of new season's smartest patterns, Money EN 5 back plan. Free premiums, ESLL NU-MODE TIE CO., Dopt. 50 R 5 1333 N. 12th Street Milwaukee, Wis,

Make money in'advertising. Prepare quickly dui earn while you learn, No experience necessary. lew, easy method. thing a3 like it. Send at once for free booklet— ''Win Success in Advertising’’, en: full particulars. No obligation. Page-Davis School of Advertisin; 3601 Michigan Avenue, Dept, 2051, Chicago, Illinois, U. S. A. ring epare time. Also [: Nothin; Always Insist on the Advertised Brand!

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BEA PIND) lO =] FROM THE HEART OF Tice GREAT RADIO INDUSTRY TRAIN YOU IN E X PERT SPARE TIME FOR A Cael fay fob! HERE THEY ARE: Kendall Clough F. H. Schnell ; Chief Engineer, Radio Engineer, a Clougn-Brengle Co. General Household r Utilitles (Grunow), E. E. Gramer Tioma Chief Engineer, Dr. €. M. Blackburn Standard Asst. Factory Manager 1 "Transformer P. R. Malloy & Company R E A | R AD | Ó Corporation. Mfrs. of Radio Apparatus Karl E. Waesel F. L. Howard Chlef Engineer, Chief Engineer Zenith Radio Radio and Television Corporation. Institute. ENGINEERS RAY D, SMITH, Pres. R-T-1 If you're dissatisfied with small pay —lay-offs and an uncertain 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, HAS MADE $250 IN RADIO IN ONE WEEK you can get my big EREE book, W m. T: “RADIO'S FUTURE AND YOUR Ridd OPPORTUNITY." This book tells how you can learn at home under the super- Vérdim vision of factory engineers, to make more money almost at once in Radio— P.O whether you want to make Radio your life's work, or use it to pick up an extra i C n da, $5 to $20 a week in your spare time. lamely TRAIN NOW FOR GOOD PAY FULL-TIME an $18 a AND SPARE-TIME JOBS THAT PAY UP TO zo a verag more than $75 $ oe 75 A WEEK (and more) a week as an R-T-I Trained man. He says: “Have made $250 in single Radio is still forging ahead. 1936 beats all other years. Over 6 million new sets sold, " T : 1 4 Over 20 million dollars paid for service alone in 1935. Where only a few hundred men were week, R-T-I 5 entirely responsible employed a short time ago, thousands are employed today. And where a hundred jobs paid for my success. up to $75 a week—there are 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 Madio Industry—right out of the factories where Radio sets and other vacuum-tube devices are made. Jt was planned and prepared and is supervised by big radio engineers IN these factorles—by men appointed for the purpose. ‘This means that trained the R-T-I way, you'll be trained as the Radio Industry wants you tralned—just as the Radio Industry, itself, would train you if it was doing the job. Television, Photo Electric Cells, Public Address STARTING SALARY HIGH- Systems Included EST HE EVER EARNED 1 1 š Harold Apley, 2658 Brookside Ave. Radio service work ts only the starting polnt in R-T-I Training. From there it will take ‘ te : d you through the whole field of Radio and Electronics. You will learn about every new Indianapolis, made as high as $20 a development, including Television, so you'll be ready when Television breaks. You'll also week in spare time while getting his learn the big money subjects such as Aviation and Auto Radio; Public Address Systems; R. T. I. training. Starting on a regu- how to handle Photo Cells; Sound Picture Recording, Etc. lat job, obtained besu of his train- z z : ing he said: “This job is starting me 4 Working Outfits Furnished in at better pay than I ever got on - » Start almost at once doing part time radio work. J furnish 4 outfits of apparatus that you any job before. 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 satisfled. 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 experlence can master |t. It offers the chance you have wanted to get oub of a small-pay, no-future job, into good pay work with a future, in Radio and all its branches. Get My Big New Free Book a [| [| [| I L| INVESTIGATE! Learn why R-T-I Training is different, Find out why R-T-I Trained men p get “Quick Results’ and "Big Results.” Send for ycur copy of “Radio's Future and Your B Opportunity” today. It tells you about ltadio's amazing opportunities. Il describes my I approved training. It tells what R-T-% students are doing and making. It gives the history of my Advisory Board and 50 endorsing manufacturers. It’s FREE. Clp, sign and mail I I L| E [| [| L| s MAIL FREE COUPON BOOK RAY D. SMITH, President, Radio & Television Institute(R-T-1) 2130 Lawrence Ave., Dept. 31, Chicago, IlI. Without obligating me, send me your book that explains your Engineer-Directed and Industry-Endorsed method of training men quickly and Inexpensively at home in their spare time to be Radio Experts, coupon RIGHT NOW! RAY D. SMITH, President Name -..-.----.~--- Wisssedoosseeme RADIO Np ELEVISION l zu Address -.--------- ------- AZO -.-2-- Dept. 31 2130 Lawrence Ave. CHICAGO Clit --2soRh eee dd Etato menee When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 17

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EDITORS ANSWER REDUCING ELECTRIC STOVE'S HEAT I have an inexpensive electric heating plate which at present consumes 500 watts of electricity. Since the heat produced is excessive for my requirements I should like to reduce the wattage consumption by 1. Should I add more resistance wire to the grill, take some off or should a trans- former be placed in series with one of the heaters' wires in order to reduce the current?—Paul Bartholomae, Chicago, Ill. If there is sufficient room for it in the grill more nichrome resistance wire can be added to the heating unit until the desired temperature is attained. Otherwise this resistance will have to be wound on a separate porcelain form and mounted externally. If a gradual current increase is desired a brine rheostat may be used. This is nothing more than a gallon crock filled with a salt solution and in which metal rods are suspended. The rods are connected in series with one of the heater leads and increase the cur- rent flowing into the heater when brought near each other. CONCEIVES AUTO ACCESSORY a A few weeks ago I submitted a motorized idea for a clothes compartment to a leading automobile manufacturer for consideration. The compartment is designed so that it becomes part of the front seat and permits clothing to be hung up without it becoming wrinkled. The manufacturer informed me that on previous occasions they had seen simi- lar devices and thanked me for the suggestion. What l would like to know is, where do I come in if they use this type of compartment in their product?—Bruce Knoch, Pittsburgh, Pa. Since the manufacturer stated that the idea was not new to them (evidently having already secured patents on the device) there is little chance of you receiving anything for the idea. According to the United States Patent office the person who files the patent first, unless earlier proof can be furnished, is the rightful owner of the idea. In your case the automobile manufacturer has sole rights to the idea. RECLAIMING OIL FOR DIESEL USE I have been told that many power utility companies em- ploy special filters for reclaiming old cylinder oil so that it can be used again to operate diesel engines. I have noticed that old cylinder oil is considerably thinner after being used in a motor, therefore I am somewhat skeptical about the authenticity of this. Is such a reclaimation process really possible?——Joseph J. Walter, St. Joseph, Mo. Whether or not a reclaimation process such as you mention is really being used we do not know, but it is not at all an impossibility. Properly filtered, so as to remove all grit, the oil could be used for diesel engine fuel. It would have in this used state the same or nearly the same body con- sistency as regular diesel fuel. 18 AG - ES ir na? READERS QUERIES CHARGING BATTERIES ON 32 VOLTS I have a 32 volt farm lighting plant, but no batteries to go with it. Can this plant be used to charge a 6-volt automobile storage battery and if so, how?——Mrs. John W. Kline, Iowa Falls, Iowa. A farm light plant provided with the necessary resistance to drop the output to a current suitable for re-charging a 6-volt battery would be possible, but not practical from the standpoint of cost. For recharging a battery in the most economical way we recommend a windcharger plant. This device consists of a salvaged automobile generator geared to a propeller. The propeller revolving in the breeze turns the generator to produce sufficient current for charging a storage battery. Plans for building a windcharger plant are available from MM at 50c. COPING SAW PLAYGROUND PROJECTS Being a recreational supervisor and in search of projects suitable for children to make with hand coping saws I am seeking your assistance. Can you tell me where I can secure patterns for plywood garden decorations and similar projects that will not be too difficult for them to make? —Miss Selma Boyer, Ray, North Dakota. An article on simple woodworking projects for the young folks appeared in the December issue of Modern Mechanix under the title, “Simple Gift Projects For Junior Craftsmen.” This article described the making of Chessmen, Hors D'Oeuvres and other novelties of a similar nature. Ad- dresses of firms supplying patterns for lawn decorations will be mailed upon receipt of a stamped-addressed envelope. ALUMINUM FOR CASTINGS Is aluminum suitable for home metal casting? I have several articles which I would like to cast in this metal, but would first like to know its melting point and its adapta- bility to this use?—Edgar Chaisson, Berlin, New Hamp- shire. Aluminum melts at 1300 degrees F. If you have access to a small metal furnace operating on city gas you can easily use aluminum for casting metal articles. If you have never before done any casting we suggest that you read the article, “Metal Casting In Aluminum and Bronze," which appeared in the December issue of Modern Mechanix for valuable information on the subject. (Editors Note: Your questions will be answered per- sonally and free of charge by MM experts provided they do not require special research or involve trade secrets. Names and addresses of manufacturers of new products described in this issue can also be obtained free upon request. Enclose a self-addressed and stamped envelope E reply. Address: Problems Editor, Modern Mechanix Publishing Co., Greenwich, Conn.)

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To help you answer these 3 questions: E Beginning Lessons in | | Drafting Before anything can be made or built, the Drafts- man firsí must draw it. Building trades, transportation, manufacturing — ALL depend on him, That is why any pickup in any line means first call for the Draftsman! Fif Yourself for a Job with a Future Drafting welcomes ambitious men — offers good pay to start, with splendid opportunities for promotion, One of the steadiest of all lines. Right from the start, the beginner works side by side with experienced men—inking in their drawings, making tracings, constantly profiting by his contact with seasoned engineers, The “‘higher ups" see his work. If it is good, advancement is sure and steady. Pleasant, well-lighted offices are the Draftsman’s work- room. He keeps regular hours, with congenial, high grade fellow workers. The work is fascinating—embraces not just one line, but hundreds, Drafting Experience NOT Necessary You can master Drafting readily by home study because you learn and advance ezactly as professional Draftsmen work—with T-square, dividers and drawing board. Actual working conditions are duplicated to the final detail. Thou- sands of successful graduates enthusiastically endorse Amer- ican School methods, nowhere better exemplified than in our Drafting course. We want you tosee for yourself—before you come to ANY decision—exactly what Drafting is like. We want you to judge your own interest in the work—and our ability to teach you. So we make this 2 Free Lesson Offer. American School, Drexel Ave, at 58th St., Chicago, Ill. Drafting Opportunities Growing Daily What are today’s 1 "opportunities in Drafting? Will I like the ™ work? Can learn Draft- V ing readily? ree Prove That You Can Qualify The 2 lessons will be sent absolutely withe out obligation. In the privacy of your own room, look them over. See how simply you start —how gradually you are led step by step—how thoroughly you master each point—how, as time goes on, you can pass from & raw beginning to coranlete mastery of Drafting—able to get andholda pleasant, profitable,steady job. Such a future is well worth looking into RIGHT NOW, so... just mail the coupon! Mail Coupon for 2 Lessons FREE DS el eal m m EMO AONO NO RA DNO E A RR UR NÉ DEG "UO CO ON NR OL C n" NR I American School, Dept. DD-128 Drexel Ave. at 58th St., Chicago E Without theslightest obligation, send 2 beginning Draft- g 125 Lessons and tree Bulletin. J am not to return them. gy Name.--....-.--.-.--.-.-.---...---.. 496......-. y Address......--.--....-.-..22..2.2..-.--.-..-----. W Cli) ucsesscoeswsem sc Re amei rect State ....--l- When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 19

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usar FRECTIFICRS | eus {amaras Ew Booties AUDELS NEW ELECTRIC LIBRARY—A progressive Home Study and Reference Course in applied electricity. Easy to understand. Ques- tions and answers plainly writien for a complete working knowledge of modern. ecua practice, necessary to every electrician, engineer, mechanic and student, LEARN THE AUDEL WAY! You ask the question—Audels New Elec- tric Library gives the answer—9500 simplified outlines, graphic lius. trations and precise expianations covering Construction, Operation and Machine Maintenance, ] P BOOK A MONTH PLAN—Order the volume that interests you—today! We will send ihat volume on 7 days' free trial. If the book helps you, send us $1.50. If lt does not help you, mall book back to us. On receipt of your first payment, we will send your second book, We allow 30 days to pay for this and for cach followlng book until you complete the Series. A f you are not satisfied, you may cancel your subscription at any time. ma — — e — e X S i KW X i M — — eee — PUN] Theo. Aude! & Co., 49 W. 23rd St., New York City ^ il Vol. I, Electric Library on 7 days' free trial. If Bement Mel wih remit 81.90. otherwise I will return it. l alise request you to mail one book each month on same terms. COUPON Name ....s* No obligation unless I am satisfied, Address World’s Lowest Priced! Enjoy radiant health. Improve ap- pearance! ‘‘Sun'’ "Tan yourself Quickly, ately. amm ere amor : ug lamp into any light socket for / Ultra Violet or Infra Red Rays, Vitamin D. Docs JN work of lamps costing 15 times more, Free Carbon Rods and Goggles. Rush $3.39. "Transportation Paid. Satisfaction Guaranteed. PROFESSIONAL PRODUCTS, Dept. 116.5, Silverton, Ohio BE SUCCESSFUL Read Invention & Fínance—it's your chance to make money. Year subscription 60c entered upon promise to pay on receipt of first copy. Place your order by cutting out and malling this advertisement. INVENTION & FINANCE MAGAZINE 80-H WALL ST., NEW YORK, N. Y. BRING YOUR RADIO UP TO DATE DD-ATUBE Get Rid of Statio, Distortion, Strong Local Inter- ference, A “New Radio” For Only. ............. Tune out strong local Stations . . . tune in Los Angeles, Canada, Mexico! Increase selectiv- : à ity—cut out static, distor- tion, interference, with amazing new ADD-A-TUBE. Uses no extra current, fils any radio, electric or battery, works on inside or outside aerial, all waves. GUARANTEED! Use 5 days. If not delighted, return within 10 days from dateship- Send No Money! Pay. nothing now. Just send name and ad- dress on post- Pay post- livery. youre order ped and your money will be refunded instantly! |day! R-E ENGINEERS, Dept. K-404, Marburg Ave., & B & O. R.R. Cincinnati, 0. @ AMAZING MYSTERY MINERAL a Reconditions Motors Like Magic/ Thru Spark Plug Openings en) MOTO-NU is compounded from strange new min- cA eral which expands rapidly when heated. Special rubber applicator draws up MOTO-NU from glass Jar and deposits it on pistons through spark plug openings. Motor heat expands MOTO-NU—transforins it into soft aluminite metal which fills scored cylinders, ex- pands worn rings, increases compression. RESULTS GUARANTEED. Gives new Saves rebore job and new rings. Lower and pep to car. DISTRIBUTORS—Make Big Money ! Millions of cars and trucks need MOTO-NU! Life- time opportun|lty to build your own business. Sell garages, service stations, car owners, dealers. Write at once for FREE DEMONSTRATOR SAMPLE and Dis- Paty. Wlaas tributor’s "No Risk’? money-making plan. MOTO-NU CORPORATION fiz. s Dept. G, Cuts gas and oil costs. DEMONSTRATOR 55th St., New York T OON Your wav Uccrss/ DON’T COPY - LEARN TO ORIGINATE! RAYE BURNS will teach you HOW to CREATE ORIGINAL CARTOONS at home that you can 85 — SELL! Course has 26 lessons and 600 illustrations, Send name and address for free details. Ouly...- RAYE BURNS SCHOOL, Dept. F-X, Box 2194, CLEVELAND, OHIO WHY RENT A BOAT? MAKE YOUR OWN Even a child can build at least one of the many boats that are described in the big new 148-page book, How To Build 20 Boats. Send 50c for your copy, now. MODERN MECHANIX PUBLISHING CO. GREENWICH, CONN. Tp% Here's opportunity! Get ready for the best paid jobs in {9 - Radio as Television sweeps the country, Train at big-time broadcasting station. Get actual experience over our Tel- evision Station W9XAL and commercial station W9 XBY., Write today for free folder and literature showing actual photos of Television broadcasting, opportunities, etc. FIRST NATIONAL TELEVISION, INC. Dept. GG1,Power & Light Bldg.. Kansas City, Mo. BIG OPPORTUNITIES AS AN EXPERT PHOTOGRAPHER You can have a fascinating, profitable career in the World's newest, big profession. Become a Commercial, News, Portrait or Advertising Pho- tographer, or Movie Cameraman. Big money- making opportunities. Personal Attendance or Home Study training. Individual, practical in- struction. 27th year. Write for FREE Booklet. NEW YORK INSTITUTE OF PHOTOGRAPHY Now York, N. Y. AT HOME You can learn by our modern and orixinal system of instruction cvery part of the Watch repairing Trade at home. ou can earn money while learning and prepare yourself for a well paying position or start in business after completing our course of instruction, Good watch repairers are in demand and generally earn very good salaries. For par- ticulars apply to the WISCONSIN SCHOOL OF WATCH REPAIRING 524 E. Mason St., Dept. €, Milwaukee, Wis. *100 SHOT” REPEATER Latest Model 1937 Haenel repeating pistol. Sturdy, massive construction. 100 shot magazine. Shoots B. B. steel shot. FREE-—500 Shots. 95 BENJAMIN AIR $2.00 deposit PISTOL .177 or .22 cal. — on C. 0. D. FREE-—Folder on Rifles, Pistols, etc. Hudson Sporting Goods, M-52 Warren St., New York 20 Accept No Substitutes! Always Insist on the Advertised Brand!

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Partlat vlew of Diesel-engine operate "b room-—one of the important epartments at Natlonal Schools. Students servicing Falrbanks-Morse Diesel power generating Added Feature! DIESEL ELECTRIC POWER GENERATION In keeping with National Schools' progressive policy of offering the most complete Course, we announce this added feature, made available to you by an investment on our part of thousands of dollars. Full instruction includes; Alternating and Direct Current Power Stations Switchboards and {nstruments Station and Motor Wiring Motors and Controls Distribution Lines, Transform- ers, etc, This specialized training en- ables our graduates to expertiy handle Diesel equipment in power plants, mines, public bulldings and utilities, boats, trains, etc. Knowledge of Diesel Electrics is just as essential as the fundamentals of Diesels. This school is the only one in the U. S., to our knowledge, offering this extra, yet necessary, spe- eialized training. YOU WORK ON FINEST and LATEST EQUIPMENT AVAILABLE IN AMERICA National Schools’ course of Diesel Training is the outgrowth of years of successful development. The instruction is PROVEN, Over 30,000 graduates have received National Training. Now, National offers the most comprehensive training—actually three complete courses for the price of one—Gas and Diesel Engineer- ing, and Electric Power Generation—all of which are absolutely essential to qualify for best jobs. Easy, Fascinating “Shop-Practice’ Method The day you begin your training at National you start right in with a practical job on the most modern Gas and Diesel equip- ment, including Caterpillar, Cummins, McCormick-Deering, Hercules, Venn-Severin, Fairbanks-Morse, Enterprise, and many others. The work is actually a pleasure for students— easy to understand—ever-fascinating You learn in a few months what would ordinarily take far longer. Complete, Modern Equipment Actually Used by Students The vast installation of modern Gas and Diesel equipment here is all used by you in learning your trade. You learn to assemble and dis-assemble all parts, learn trouble-shooting; operating and all essentials to qualify you for big-pay Gas and Diesel opportunities. Your instruction is personalized under direct supervision of a large staff of experts. LEARN IN LOS ANGELES, Playground of America RAILROAD FARE ALLOWED | EARN ROOM AND BOARD For a limited time, coach R. R. fare] We help students obtain part- allowed to L. A. from any part of| time jobs lo earn room and the U. S. board while learning. QUALIFY FOR GOOD PAY JOBS NATIONAL'S Master Training Includes All Phases of Diosel Engines Fuel Injection Gas Engines Butane Engines Propane Natural Gas Auto-Diesel Electrics Also Diesel Power Generation Machine Shop Batteries NATIONAL SCHOOLS, LOS ANGELES Established 1905 NATIONAL SCHOOLS, Los Angeles, Calif. Dept. 1-MMA, 4000 So. Figueroa St. Please send Catalog I 1 | i SAGE sue | I l t J Electrical trouble-shooting in gas engine department. When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 21

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Guaranteed $1025? Model NOW Only $ 90 Cash 44» or On Easy Terms SMALL CARRYING CHARGE 10 Day Trial No Money Down Positively the greatest bar- gain ever offered. A genuine full sized $102.50 office model re- GUARANTEED finished Underwood No. 5 for only $44.90 (cash) or on easy terms. Has up-to-date improvements including standard 4-row keyboard, backspacer, automatic ribbon reverse, shifte jock key, 2-color rlbbon, etc. The perfect all purpose type- writer. Completely rebuilt and FULLY GUARANTEED, Learn Touch Typewriting | Money Back Guarantee Complete (Home Study) š Course of the famous Send coupon for 10-day Trial an. Sant speed Types —-if you decide to keep it pay writing System: fully only $3.00 a month until $49.90 (term price) is paid. ilustrated, casily learned, given during 4 Limited offer—act at once. this offer. | INTERNATIONAL “TYPEWRITER A EXCHANGE . 231 West Monroe St., Chicago ili., Dept. 208 Send Underwood No. 5 (F. Chicago) at once for 10-days' trlal. If i arn not Sertectiy satisfied I can re- [ turn it express collect. If I keep it I will pay $3.00 a month until I have paid $49.90 (term price) in full. For quick shipment give references and occupation Name - -Age - Address . Alrlines, TactoHes; Operators are pllots and = mechanics. calling on us for Lincofn tralned This LINCOLN Government Approved School gives you the complete training and practical iu € Countries. WRITE for Catalog. Please "State age. LIN & FLYING SCHOOL, Division of LINCOLN AERONAUTICAL INSTITUTE (INC.), 407F AIRCRAFT m LINCOLN, NEBRASKA. alify you for these good pay jobs. Tr: jovernment License as Pilot or Airplane now in 26th year; 16 years teachin x tion: immediate employment with leading experience that here for Engine Mechani , Factories and ii 901 W- JACKS! | BLVD.. 22 orl WHOLESALE RADIO SERVICE CO. nt There's nothing like that lift you get when you bring in foreign stations on a swell radio you’ve built yourself. Lads from 8 to 80 indulge in this fascinating outlet to their mechanical bent. Bulld any of the circuits de- scribed In this magazine. Wholesale can supply parts for all of them, Write for full parts list. It's FREE. Give Electrical Gifts—they last! Our spocial Xmas Catalog No. 65-A22 contains hundreds of unheard of values. Latest models of RADIOS, ELECTRICAL TRAINS, TOYS, HOUSE- HOLD APPLIANCES, ete, Send for !t. It's full of bargains and it’s FREE. ZLLAMMMM ALL - ELU. e NEW YORK, N. Y., 100 SIXTH AVENUE “BRONX, N. You 542 E: FORDHAM RD: ATLANTA, 430 W. PEACHTREE ST. N: ew ^D NEWARK, N. J x z 219 CENTRAL AVE Graduates receiving Foreign COLN A IRPLANE WHAT TO MAKE and how WRITE for these books! (1) The Home Workshop, free; (2 What to Make on the Lathe, 10c; (3) How to Runa Lathe, 160 pages, 25c, Coin or stamps accepted, Any South Bend Screw Cutting Lathe on easy terms. Priced from $75 up, SOUTH BEND LATHE WORKS 805 E. Madison Street South Bend, Indiana, U. S. A. , RADIO EN G l N EER I N G j broadcasting, aviation and police radio, servicing, marine radio telegraphy and telephony, Morse telegraphy and rail- way accounting taught thoroughly. Engineering course of nine months’ duration equivalent to three years of college radio work. School est. 1874. All expenses low. Catalog free. DODGE’S INSTITUTE Fern St. Valparaiso, Indiana PAD JOBS for THOUSANDS in IR. SONDITE and REFRIGERATION If you: want steady work—all year *round—good pay. or a business of your own, prepare NOW. Such ground-floor opportunities are rare. Learn at low cost right in your own home (or at our school in 34th Year Get Free Chicago), Write for FREE ‘Prosperity Bookiet.'" “Prosperity CHICAGO TECHNICAL COLLEGE E Booklet’ A-316 Tech Bidg., 118 E. 26th St., Chicago MAKE up to $65 WEEKLY in new kind of wholesale business. Place famous line 5¢e-10c goods with stores. Mer- chants grab our FREE GOODS Deals. 200 fast- selling products—all on salesmaking Counter Displays. Up to 140° profit for vou and merchant. No experience or investment to start, Big catalog and facts FREE. World's Products Co., Dept. 1814, Spencer, Ind. AMAZI NG NEW BUSINESS Sell to Stores AUTOMOBILE RACING Now Book (Fourth Edition) Nine Chapters, 66 illustrations of dirt, midget and championship cars and drivers. How to build cars and bodies; 14 plates working drawings. Converting stock cars to 1385 m. p. h. racers. Book answers all questions on speeding up cars, balance, speed revs, rules, specifications, track records, etc. Post- paid $1.00, C. O. D. $1.12. Order NOW. RAY KUNS, Dept. A-1, Cincinnati, Ohio “ENGINES (4 Lower your power cost with a smooth. ase WITTE Diesel. Operates on running non-explosive fuel at one-eighth the usual cost of a gasoline engine. The savings in fuel alone will soon pay for it. 5 and 10 H-P. Also Dieselectric Plants. WITTE ENGINE WORKS, 1571 Oakland Ave., Kansas City, Mo. Accept No Substitutes! Always Insist on the Advertised Brand!

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MAKE UP TO $605. with my proven plans ili Help You Start . e . No Money Risk I can now give you a remarkable opportunity to make big earnin your very first week. TIl back you with my proven successful plans. If you can put in full time, you may make as high as $60.00 in a week—even spare time pays up to $5.00 in a day. Housewives make up to $22.50 in a week for a few hours. My plan gives you Pleasant, permanent occupation with amazing earning possibilities. If you are will- ing to put in a fair amount of time for a good day's profit, rush me your name today—get all the fucts~-FREE. Have a Big-Paying Permanent Business My plan pays fine profits because you supply everyday household necessitles—things people must buy. You simply take care of a regular list of fumilies in your lọ- eality, calling on them once every two weeks, You take in all the money and keep a big share for yourself, No previous experience necessary. I send everything com- plete. You don't risk a penny. Nothing complicated; actually ''ready-made'' for you. Send no money—Jjust rush your name so I can lay al! the facts before you; then you ean decide for yourself. Start right in and make money your very first day. Brand new Ford Sedans given to producers as a bonus, besides your cash earnings. coe nothing to investigate. A postcard will bring free details, Write today— Tight now. ALBERT MILLS, 3728 Monmouth Ave., Cincinnati, Ohio $63.75." “Only 612 weelt G. W. FOOD DISTRIBUTORS Started Penniless= 615 Months Later Worth $1,200.00 months ago I started with your organization without a penny to my name, and today (I just finished my am worth a little more than $1,200.00. can hardly believe it possible—such a suc- cess in so short a time." Nebraska. Reported 563.75 in One Week "Y want to thank you for the Ford Tudor Sedan which you gave me as a bonu: sldes my regular cash earnings. in a ins Wright, Maine. Hans Coordes, have been as high as THOUSANDS LEARN MUSIC WORLD’S EASIEST WAY No Expensive Teachers....No Bothersome Scales....No Boring Exercises BEGINNERS LEARN REAL MUSIC FROM THE START Yes, literally thousands of men and women in all walks of life have learned music— have won new friends, become socially pop- ular this quick, modern, easy as A-B-C way. You, too, can learn to play—to entertain others—-to pep up any party—just as these thousands of others are doing. Ánd you can do this without the expense of a private teacher— right in your own home. You don't need to be tal- ented. You don’t need previous musical training. You don't have to spend hours and hours playing monotonous scales and humdrum finger exercises. You start right in playing real little tunes. And sooner than you expected you find yourself enter- taining your friends—having the best times you ever had. Easy as A-B-C The U. 8. School method is literally as easy as A-B-C. First, it fells you how to do e thing. Then it shows you in pictures how to do it. Then you do it yourself and hear it, What could be simpler? And learning this way is lke playe a " ing a game. Practicing becomes Piano Accordion real fun instead of a hore as Or Any Other it used to be with the old way. Instrument Prove to yourself without cost how easily and quickly LEARN TO PLAY BY NOTE Piano Gultar Violin Saxophore Organ Mandolin Tenor Banjo Hawaiian Guitar you can learn to play. Lesson and Explanatory Booklet, around which this method is built. * learn music—if you want to win new popularity—enjoy good times galore—-mail the coupon below. Don't delay—act Send today for Free Demonstration See the simple principies If you really want to NOW. Instruments supplied when needed. Cash or credit. U. S. School of Music, 2621 Brunswick Bldg, N. Y. C. U. S. SCHOOL OF MUSIC 2621 Brunswick Bldg., New York City Send me your amazing free book. “How You Can Master Music in Your Own Home," with inspiring mese sage by Dr. Frank Crane; also Free Demonstration Lesson and particulars of your easy payment plan. NAMO .....eeeeeeeseesesececsvoscoceseosocsocsceseo ves AGAIEES ————— Tave you Justrument,..... eee e eese see. Instrument?........ When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 23

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Unio CIA p Long takes a friend Top—-A. D. Pittenger, of Los Angeles, Calif., for a sail in NOMAD, a boat built from MM plans. It carries four people. Bottom—Close-up showing construction. HE mailbag was pretty heavy this month and letters and photos describing many in- teresting projects completed by MM readers in- dicate that home workshops are gaining in popu- larity. From workshops with limited space and & few good tools to spacious shops equipped with lathes, many tools, and other mechanical aids, MM. readers are turning out projects of every type and description. Most of them are built from plans that appeared in past issues of MM publications. ok Talking about making things, don't overlook the new 1937 edition of the MM Handy Man's 24 Home Manual that is now on sale at your local newsstand at 50 cents per copy. If your news- dealer has run out of copies, order one direct from MM at Greenwich, Conn. Presenting many practical kinks, plans, and detailed instructions for many projects, the manual will be a welcome addition to the library of any workshop fan. Its 144 pages feature over 800 illustra- tions. *dek First prize of $5 cash for the most interesting project photo received this month goes to A. D. Pittenger, of Los Angeles, Calif. He says: Los Angeles, Calif. Dear Editor: Enclosed are photos of NOMAD which I built in my attic. You can see from the photos that I followed the MM plans very closely, even to the hollow mast and boom, although I changed the cockpit a bit. She sails nicely and I have had her in a blow so hard that sand was flying on the beach, I have sailed for hours with four aboard and have hit some big waves without shipping any water. A. D. Pittenger. Pittenger's boat certainly is a beauty and judg- ing from the close-up of the craft, it entails craftsmanship of which he may well be proud. Good luck, Pittenger. * uo Trailers are becoming more numerous and MM readers are quick to show their skill at con- structing them as the following letter proves: = be A real home on wheels is this trailer built by Howard R. Goldy, of Camden, N. J. Its four bunks, stove, radio, sink, and other household articles insure comfortable traveling. Modern Mechanix Hobbies &

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Io Calor binc, Camden, N. J. Dear Editor: I am sending you a photo of my trailer. It is 12 feet long and has a chassis similar to the one used by Sir Guy Standing in the MM "How To Build It" book. Inside the trailer are four bunks, stove, refrigera- tor, closet, sink, and a home-built five tube radio. I have the MM article describing the CRUISEMITE trailer and would like to make my next trailer like it. Howard R. Goldy, Mr. Goldy was awarded a prize of $3 for his trailer photo and letter. He certainly has turned out a creditable trailer and we know he will encounter no trouble in building CRUISEMITE. He oe ie Midget cars are still a heavy favorite with MM craftsmen and hardly a mail fails to bring several photos of trim little speedsters. A $3 prize was sent to Homer Groce, of Clemson, S. C., who says: Clemson, S. C. Dear Editor: I am enclosing a photo of a car I built, It has a model A Ford motor hooked up to a model T Ford rear- end. Cooling is accomplished by two radiators, cut down, and placed one in front of the other. I get 28 miles per gallon with the car and it is capable of doing 80 m.p.h. I will gladly answer any questions from MM readers if they include a stamped, return envelope with their inquiries, Homer Groce. Here's a chance to get first hand information about a real snappy looking racer. You can reach Mr. Groce at Clemson College, Clem- son, S. C. kkk Boats and more boats. All good ones, too. No Featuring a double radiator cooling system, this midget racer attains a speed of 80 m.p.h. and travels 28 miles on a gallon of gasoline. It was built by Homer Groce, of Clemson, S. C. Inventions, January, 1937 A pleasant sight to the eyes of boat lovers is this trim looking sailboat built from MM plans. BUDDY, as the boat is known, was built in little over a year by Neil Hoyt, of Detroit, Mich. matter how many workshop letters the editor receives, the number of boat letters and photos far outnumbers the others. Our only regret is that we cannot print more of the letters, but Space is limited. From Detroit, Mich., comes a letter and photo that secured a $3 prize for its writer. Detroit, Mich. Dear Editor: Here is a picture of BUDDY, built from plans in the MM book—‘How To Build 20 Boats." I am very proud of her as she is the first boat I ever built, It cost about $250 and required a year and three months to build. I am putting outside ballast on the keel this winter as I use her on the Great Lakes. I'll be glad to give any information to MM readers who may wish to build BUDDY. Neil Hoyt. We sure envy Mr. Hoyt. He'll be able to make some excellent cruises in BUDDY. He has reason to be proud of her for she is a trim craft and pleasing to the eye. * kk Winter weather always spurs the snow-sled fans and they don't forget to send photos to their [Continued on page 26] 25

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Theres Quicker, Bigger MONEY For YOU-in POULTRY Earn $1,000 to $2,500 a Year or Have a Business of Your Own! Whether ieu want 2 job at good pay or a highly profitable business of your own—the Poultry Industry offers you more than any other. There's a shortage of poultry meat and eggs — a shortage of trained poultrymen. I'll train you quickl. at home—to fill a good job in Poul- try—and our FREE Students’ Im- ployment Dent. willhelp yougetone! | FREE Book Shows the Wayto Big Pay and BIG Profits Mail coupon below TODAY bazernent,or barn, Raise friera —for my Big NEW FREE end brollers thay ra ready for Book, “How to Raise Poultry e Cash market without eve! * being taken out of the battery Tor POAT a My Iony M brooder, No farm needed, City p yours. folks can make $1,000t0§2,500 Poultry Industry a year, I'l! show you howto needs YOU. Youneed make a tiny Investment grow my bcok. Get it—and geb eutomatically. What I've done in line for the BIG Money for thoueands of others I can that’s waiting for you in | POULTRY. do for YOU. Bs. : Mail NOW for FREE Took NATIONAL POULTRY INSTITUTE, Dept. 133-B Adams Center, N. Y., Harry M. Lamon, Pres, Fi " 1 H : Dear Mr. Lamon: Send me your FREE Book, "How to Ratse [1 E a LI SEE HOW EASY IT !S TO ' - BTART—CASH IN QUICK Modern ''factory'' methods— using a brooder—make it enay or you to raise poultry InlImit- ec apace, Startin your garage, Poultry for Profi" I want to know more about my oppor- tunity to make $1,000 to $2,500 a year, spare or full time. NATE ——— Address..,. Pa0nBnERREAEERSEEEEEREHEREEBEEREREURERSERREURSURREEREEERERENZARR J m. ARTIST Make $35, $50, $75 a Week Learn at Home This Simple, Practical Way More and more trained Artists are needed each Year. Hundreds of magazines, advertisers, news- papers, printing houses, cte., pay good money for art work. Our simple, practical method makes it fun to learn Commercial Art, Cartoon- ing and Designing AT HOME, in spare time. Big Artist's Outfit Given Drawing board, paints, brushes and all mate- rials you need come with very first lessons. Actual fun learning to draw this way. Be an arlist and make big money! Send for FREE BOOK Our big Free Book describes latest developments and wonderful opportunities in this fascinating field and gives full detalls of this simple, prace tical method. Tells all about our graduates— their suceesses—whot they say—actual reproduc- tions of their work—and how £ trey earned big money even your course I have f while learning. Mail coupon earned as high as] below or postcard today. State $125 a week.” age. (No salesman will call.) m a m " B a ` $76 a Week = that's what our student, H A., of Penna.. averages. Has made over $1200 in spare time! $3000 for W. R. K.— of Newark, N.J. He writes that just two contracts brought him that neat sum! $125 a WEEK J. R., of Syracus N. Y., writ ce comple Washington School of Art, Studio 201 1115—ISth $t., N. W., Washington, D. C. Please send me, without obligation, your Free Book, "Art for Pleasure and Profit.’ eT ee eee UU E RO UC M UN EY 26 Accept No Substitutes! Editor's Workbench Chips [Continued from page 25] Powered by an old motorcycle engine and a small propeller, this snow-sled slides along at 62 m.p.h. Paul R. Bussler, Wil- liamsport, Pa., built it from wood and sign painter's canvas. favorite magazine. Here's a letter from an MM reader of long standing: Williamsport, Pa. Dear Editor: I'm sending the Workbench a photo of a snow-sled we built, It is made of wood except for the motor mount which is made of %-inch piping. The body frame is covered with sign canvas doped up with paint. The sled is powered with an old motorcycle engine and averages over 62 m.p.h. I would like to see some articles on gas-powered air- plane models. I have been reading MM for over eight years and must say that there is no better magazine published. Paul R. Bussler, Bussler's sled photo won a $3 prize. Send in photos and letters about your completed projects, readers. You may be awarded a prize, too. The advice in our guest editorial this month is a summary of the advice which Mr. Emile F. du Pont gave originally in an address to the American Chemieal Society, Division of Chemi- cal Education, meeting in Pittsburgh. We believe it good advice to any sort of job aspirant. Chemists have played a large part in the de- velopment of E. I. du Pont de Nemours & Co. The founder who started the business in 1902, was a chemist who had been an associate of Lavoisier. Of the firm's present 41,000 approxi- mately 3,000 have had chemical training. Wee Readers in New England should listen to the Modern Mechanix Sunday radio programs over the Yankee network. Eight stations of the net- work and WINS, New York City, broadcast the program at Noon. It is repeated from WTIC, Hartford, Conn., at 1 p. m. Always Insist on the Advertised Brand!

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METAL WORKING LATHES 33975 to 511259 SEND FOR 1937 ATLAS CATALOG-FREE ATLAS PRESS CO., 152 N. Pitcher St. KALAMAZOO, MICHIGAN 52 PAGES Displays At METAL LATHES, WOOD Chicago New York Philadelphia LATHES, DRILL. PRESSES, 35 E. Wacker Dr 130 W. 42nd St. 113 N. 3rd St. ARBOR PRESSES, TOOLS "Be the ONE Man in On Who Can — Modern Sets! Modern circuits stump the old-time cut-and- What R. T. A. Graduates Say try radio fixer. More puzzling complications are Norwood, Ohio coming. Trained men with up-to-the-minute radio | LFAvesSonmeted aper and wish to ex. knowledge are urgently needed to service these new | tend my tnanks for your help. receivers. Such men can make up to $3 an hour. JOSEPH RAPIEN, JR. No Past Experience Needed Ivanhoe, Virginia ý Pl h the diploma to me at once. Past experience counts for little at this time because changes | I am doing a food Business in Radio, and in radio design are so swift and radical, That's why you, | I want to say again that I can't thank you as an R. T. a Certified Radio-Technician can quickly work | &20Ugh for what RA AU PARTIM up into the big money class. Write today for full particulars. TT a OF EXTRA COST : wes wm wwe RADIO TRAINING ASSOCIATION OF AMERICA vou with this Circuit Ana- ! HST, and Point to Pont Dept. MM-71, 4525 Ravenswood Avenue Chicago, Il. The new ‘1936’? edition of "AUTOPOW ^" with all the original specifications and many new ones is now off the pr The book is plainly written and jlustrated—the instructions easy and simple. Change auto generators into practical 4. C. and D. C. generators and motors with voltage from 2 to 1,000 volts, for power, light, welding, radio, sound, ete. No experience nor special tools needed to make these economical changes. Generators can be driven by wind, waler, fan-belt, et $500 IN PRIZES GIVEN TO THE READERS OF “AUTOPOWER.” nd for your copy today. Price only $1 postpaid. AUTOPOWER, INC., Dept. 412-H, 412 S. Hoyne Ave., Chicago When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 27

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AUDELS Carpenters and Builders Guides Inside "Trade Information for Carpenters, Builders, Join- ers, Building Mechanica and all Woodworkers. These Guides give you the short-cut instructions that you want— including new methods, ideas, solutions, plans, systema and moncy saving suggestions. An easy progressive course for the apprentice tnd student. 3 practica ily helper an Quick Reference for the master worker. Carpenters every- where are using these Guides a3 2 Helping Hand to Easier Work, Better Work and Bet- ter Pay. To get thie assiat- ance 4er EVE ii fll Inside Trade Information On: PoN da {he FREE COU- How to use the steel square—How to file end set saws—How to build furniture—How to use a mitre box—How to use the chalk line—How to use rules end ecales—How to make joints—Carpenters arithmetic—Solving mensuration problema—Es- timating strength of timbers—Iiow to set girdera and silis—How to frame houses and roofs—How to estimate costs—How to build houses, barns, gar- ages, bungalows, etc.—How to read and draw plans—Drawing up specifications—How to ex- cavato—How to use settings 12. 13 and 17 on the steel square—How to build hoists and scaffolds— skylights—How to build stairs—How to put on interior trin— How to hang doors—How to lath— lay floors—How to paint THEO. AUDEL & CO., 49 W. 23rd St., New York City Mail Audels Carpenters and Builders Guides, 4 vola., on 7 days’ free trial, If O.K+ Y will remit $1 jn 7 days, and $1 monthly uatil $0 is paid. Otherwise I will return. thein- No obligation unlesa I am aatisfied. Deeupstion...... Reference... cscs ceeeeeees . . M. M. Erde Tur "e 2 Many Finish in 2 Years Go asrapidly as your time and abilitics permit, Course equivalent to resident school work. Dur- ing the past 14 years, our graduates have been admitted to 531 different Universities, Colleges, Junior Colleges and Normal Schools—s80% of them without entrance examination. Also pre- paresfor teacher's certificate and pre-professional examinations, Meets all preparatory educationalrequire- @ ments for Business and Industry. Standard H.S. texts supplied. Diploma. Credit for H. S. subjects already completed, Single sub. ects if desired. Tuition low ^ mon! y. ea Agi 'chool raduate. Seni for details NOW: ^ $ 2 (0) (6) Specialized training isabso- | t e r lutely essential to Success J today. Over 150 noted C (o1 8E T I] Educators, Engineers and Business Men helped prepare our special instruction material, used by many resident Schools and colleges, U. S. Navy and Province of Manitoba, Can. Train at home for best-paying lines of Business and Industry, as listed in coupon below. No interference with pres- ent earnings while preparing for better job. American School, Drexel at 58th, Chicago Mail Coupon for.Information—No_ Obligation American School, Dept. H-128, Drexel at 58th, Chicago Tell me how to train for success in line checked. z ,,L] High School Course in 2 Years _ M Air Conditioning ii Electrical Refrigeration Architecture and Building [| Highway Engineering Automotive Engineering Liberal Arts (College) Aviation Mechanical Engineering B ; a Private Secretary N Civil Engineering Professional Accounting Complete Law _ Incl. C. P. A. Coaching Diesel Engineering Radio and Television Drafting and Design L]Salesmanship _ Electrical Engineering Steam Engineering Name: ssec Address. STOP Your Rupture Worries! Why worry and suffer any longer? Learn about our perfected invention for all forms of reducible rupture in men, wornen and children. Support fitted with automatic air cushion assists Nature in a natural strength- ening of tbe weakened muscles. Thousands made happy. Weighs but a few ounces, is inconspicuous and sanitary. No stiff springs or hard pads. Nosalvesor plasters, Durable, Cheap. Sent on trial to proveit. Beware of imitations. Never sold in stores or by agents. Write today for full information and Free Book on Rupture. All correspondence confidential, BROOKS COMPANY, 136-B State St., Marshall, Mich. COLT 45 CAL. Frontier MODEL Basswood construction kit with working plans and all necessary $ 45 hardware. Barrel and‘ cylinder are a, machined. P — COLT 43 Cal. '"FRONTIER'' model kit, 434" barre! $1.45 COLT 45 Cal. ''FRONTIER'' model kit, 512" barrel. 1.55 COLT 45 Cal. ‘FRONTIER’ model kit, 7” barrel 1.70 COLT 45 Automatic Pistol kilt — - 1.00 Postpaid in U. S. -x ino GUN MODEL CO., Dept. D-21, 2908 N. Nordica Ave., Chicago, Il. The established, proven BIG MONEY field. Do you want easier work, leisure time, independence, a business for yourself, and $150 a week? Train quickly at home on actual work. “ew easy Picture- Way method of teaching makes experience unnecessary. You re- ceive the personal altention of D. Rogers Stewart, the noted Artist-Instructor which makes thls the finest instruction obtaln- able, Free placement service. FREE sign outfit. For FREE les- Son, criticism, and information, write at once to: STEWART SIGN: SCHOOL, 3555 Aberdeen, Alton, IIl. Low tuition. Enrollment limited. 1000 BARGAINS AGENTS UNDERSELL STORES Clothing, Dry Goods, Shoes, Notions, School Supplies, Nov- elties, Punch Boards. Razor Blades, Drug Sundries. Cos- metics, Perfumes, Food Products, Soaps, Carded Goods, Specialties, etc. Dig Illustrated Catalog FREE, RELIABLE JOBBERS Dept. 113, 939 W. Roosevelt Rd. C.E. Broo e, Inventor Chicago TESTED 40 POWER $1.98 A PRICE SENSATION! Only $1.98 for this powerful 5 sectlon scien- tific Instrument. AMERICAN MADE. 3 lenses in the eye-piece alone. See the rings of Saturn. Objects miles away brought right up to you. Can also be used as a powerful MICROSCOPE. POSTPAID. SEND ONLY $1.98. C. O. D. charges 24c extra. NELSON LABORATORIES, Dept. X1, 505 Fifth Ave., New York ADIOS, . ALL NEW 1937 MODELS! DEAL DIRECT—FACTORY PRICES! iron-Clad Written Guarantee! A penny postcard brings you our new, fulle color 16-page BARGAIN CATALOG free, Many ui] models to choose from: 4 to 19 tubes; AC-DC, All-Wave and new Farm sets that operate like city radlos! 30-DAY NO-RISK HOME TRIAL! Send post card or coupon below for full detalls Vij of our 30-day no-risk trial and ?] Agent-User proposition! MAIL COUPON GOLDENTONE RADIO CO., Dept. H, Dearborn, Mich. AGENTS! A real making Without obligation, send me offer. Write new 1937 Catalog and 30- at once for day trial plan. territory! Address - 28 Accept No Substitutes! Always Insist on the Advertised Brand!

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types pieset engines x ~ = ractical tr ; $ The Pacific Northwest, home of the Adcox School, is the “hot spot” of Diesel activity and a center of Diesel employment, offering countless opportunities for Diesel Experts. Every branch of Diesel industry is repre- sented here including trucks, tractors, Diesel shovels, Diesel - donkeys, Diesel motors in mines, large and small boats—it is probably unequaled by any other Diesel center in the world. - Diesel- electric and Diesel-hydraulic training The Adcox School has been in business 27 years world. Remember, the best training and is the most prominent school of its kind in the pays best. à > United States. Recommended by leading educa- Before you choose a Diesel school care- tional authorities as one of the finest practical fully read valuable big, new, 40-page trade schools in the world. Students from vir- Adcox Diesel School Catalog 'No. 19-F tually every state including Alaska. .—free on request while the present sup- Study in the matchless climate of the Pacific North- ply lasts. wet Enjoy numerous outdoor recreations such as fe s E shing, hunting, hiking, sight-seeing, mountain i (oX o) climbing, swimming and other thrilling, healthful DI ESEL B K FREE diversions. MR. L. L. ADCOX, President $ Enea 4 ë s + . E, oadway, Portland, Ore. Earn board and room while learning. You will find BÍ Without obligation, please send FREE new, big us friendly people here with a personal interest in 40-page Diesel School Catalog No. 19-F. your welfare and success, and fair treatment at all times. Adcox graduates located in all parts of the WANTED NERS MANUFACTURERS By old established firm, to cast Christmas goods, 5¢ and 10c Novelties, Toy Autos, Ashtrays, etc. Can be done in any spare room, basement or garage. No experience necessary as we furnish full instructions with moulds NEW SCIENTIFIC WONDER. si and small outlay starts you. A rare opportunity for these times, so if over 21 and you want to devote your spare or full time to profitable work write AT ONCE for full details as we are now closing arrangements for supply of our goods. “Stver Oniy’ BOYS 212, FUN, You apparently see thru Clothes, Wood, Stone, any object. See Bones in Flesh, FREE PKG. radio picture METAL CAST PRODUCTS CO. fms, taken pictures without camera. “You'll like 'em." 1 pkg. ‘with, eac a oror: 1696 Boston R: ` Dept. 2, York, N. Y. MARVEL MFG. CO., — Dept. 8B, NEW HAVEN. CONN. gaton Roads: Rept: 2, New Yori NM s. FROGS SELL UP TO $5 PER DOZEN! Pair of breeders may lay 10,000 Eggs FRE Yearly! Price’ steady. Markets waiting. Ex NUFÜND GIANTS WEIGH UP TO 3 LBS. EACH Millions used yearly! Easy to ship to any part of the country. Nation-wide market at your command. START BACKYARD! Small pond in your back- yard is all you need for five pairs of breeders. Expand with increase. WE BUY! As originators of Canned Frog Legs, we are developing one of the world's largest frog markets. In addition to other markets, frog raisers can also ship to us. MEN AND WOMEN! Investigate this interesting, new work. See for yourself what others are already doing. Send for our big FREE frog book explaining our offer in detail. Write AMERICAN FROG CANNING CO. Dept. 119-A New Orleans, La. When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 29

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Boys! Men! i: XMAS GIFT! 29 PIECE ELECTRICAL EXPERIMENTAL KIT, WIRE U thief detector, extenslon phone, CONSTRUCT are | nant Ama. E E : d electric welder, radio code set, oñ EU PEUT EE P dd 25 Pieces Genuine Commercial Apparatus " n private conversations), gen- T = electro-plating, arc furnace, circuit tester, 110- erate ultra violet (sun tan) health NOT 2°¥S put, rea aiee ke donais LIO. volt rectifier, 110-volt motor, hundreds of fasci- tavs, make real electric stove, ete. Volt A. C. power moter, Sone ee AFG carbons, + transformer, polarized test recelver, are carbons, ji t Thrilling and educational experi- gjectro-i net. test compass, plating chemicals’ nating experiments. d electro-magnet. test compass, P g chemicals, ments. condenser, secret service transmitter, powerful -peig AMAZING Motor Trans- magnet, plating anodes, test socket, 110-vol6 power reducer, ted cord, ang, clips a other 1 valuable pleces. omplete illustrated experi- VALUE! Uer Kit mental mánual furnished. e ^ igi i =.. æ s Works from house light cur- of thrilling Original List Price of Parts $18.50 rent. Weld iron or brass. Melt A.C. experi- Orders shtpped same day received Only 99 glass, metal, wale are light mene. Free X FREE 2 Manuals—1. Short Course In range. . book f Piei io. 05 ^4 Generate Sun tan Tays. Gon. Dow. Make motor, transformer, elec. hammer, Electricity and Radio. 2. Blue QM ES sists of nre holder, stand, car- floating ring, step-down transformer, strobo- Dons, power coils, cord, plug,etc, scope, etc. 100 laminations, mounted rotor, Special goggles. Erperinent pulley, wire, cord, plug, lamp, colls, etc. book free. (List price, $4.75.) List 36. SPECIAL - - - 4.49 SPECIAL - = = =~ © = « $2.87 Prints and Plans for Home Laboratory. * with Electricity. Send stamp for Electrical, Radio and Tool Bargain Catalog. ORDER TODAYI ELECTRICAL SALVAGE CO. Box 524-A10, Lincoln, Nebr. et and Make up to 112 in a Day! Let me send you this fine all-wool tailored suit FREE OF COST. Just follow my easy plan and show the suit to your friends. Make up to $12 in a day easily. No experience—no canvassing necessary. et Send for Samples—FREE OF COST Write today for FREE details, ACTUAL SAMPLES and “‘sure-fire’’ money getting plans. Send no money. H. J. Collins, Progress Tailoring Co., Dept. N-137 500 5. Throop St. Chicago, IIl. for Home—Shop— School — Profession Grinds, drills, en- graves, routes, carves, sharpens, polishes and does hundreds of Jobs quicker, Peten djes easily as a D BECOME A SUCCESSFUL pencil—weighs only six ounces, E T E C T I V E und is amazingly powerfut. 110- VoltUniversal Motor—about 20,000 r.p.m.—ollless self-align- ing ball thrust bearings. „Handy z built-in switch. Easily replace: Earn Big Money—Travel or Work at Home. Train Yourself able brushes. Universal Collet z h 2 Chuck. Bakelite housing. You for Secret Investigation and Confidential Work by Our Easy muat see and use [puo appreciate Home-Study Methods. If You Are 17 or Over Write for Order on 10-day trial. Money re- Free Detective Paper and Interesting Literature. E ONLY funded if not more than satished. BOOKLET FREE. 20-piece Crafts- NATIONAL DETECTIVE SYSTEM $ 85 man's Tool Set for all types of Moto-Tool work, $5.75. DREMEL MANUFACTURING CO. Dept. D Fremont, Nebraska SENT POST PAID 1013-CT, Racine, Wisconsin j; SPECIALS —AIR PISTOLS & RI FLES Write for free booklet describing *107 Plans for 100 Shot Repeater Operating a Successful Business of Your Own”, HAENEL a — passe) By Make from $20 te $100 a week starting in spare AIR PISTOL $ "o : i No license, powder or pumping. For target M iN practice, small game, rats, etc. Well made, B strong, powerful, easy loading; heavy metal, time at home. No peddling or house-to-house selling. Booklet sent free, and without obligation. Write for your copy today. ELITE PUBLISHING CO. wood Stocks, 7 in, overall; wt. 1 lb. 500 Dp Steel BG's FREE. Special $3.95. Extra Steel hr Dept. G— 214 Grand St. New York, N. Y. Shot, 35c per 500. Holsters for Model 100. TD ETE z Meenfire, single shot 200 BB's, Darts, Target. s & HAENEL Hi-Power Mod, 26; rifled; 177 cal. accurate lw hard Shooting: 500 Pellets Free. $6.95 Crosman Air Rifles, 22 cal. Single—$8.45 Repeater ..-----------2-22-2-22------- $10.95 Benjamin Air Rifles, SInzle Shot $5.45; Repeate --$5.95 Benjamin Air Pistols, 177 and 22 cal. hi-power. _-$6.95 500 Pellets—177—G60c;_ 22—75c; Darts 177—25¢ 2 cal.—-35c doz. 2 New bargain Catalow. IUfles, Firearms, BInoculars, Telescopes, M'cro- 6copes, Knives, Holsters, etc. Send stamp. $2 Deposit required on C. O. D. Send M. O. In full and save C. O. D. charges, B LEE SALES CO. (Dept. M) 38 West 32nd St. New York City TRAIN o I? Wee ks APPRENTICES Ambitious, air-minded young man, interested in entering the well paid field of Avialion, write immediately, enclosing stamp, to MECHANIX UNIVERSAL AVIATION SERVICE incorporated Strathmoo Station Dept. A Detroit, Michigan | FOR e a i TRAINING EASY PAYMENT PLAN GET DETAILS of MY AMAZING OFFERI Prepare for jobs in Radio Broadcast, Taing Pictures, Televi- sion, by twelve weeks of practical shop work in the great Coyne Radio Shops, on real machinery and equipment. m Jon pned advanced A EACH! education or experlence. Free Employment Service for life. Many earn while learning. ali coupon today for free book which tells EA how S LOW AS 6c hundreds have become successful adio men after getting a training and all details of my **Pay Tultion After Graduation” Plan. Amazing rubber mold-making outht makes pere fect molds of plaques, medallions, .statues, H. C. LEWIS, Pres., COYNE RADIO SCHOOL busts of famous men and women, ash Ways, 500 S. Paulina Street., Dept.17-14 Chicago, bookends, etc., from 6c to 25c each. One Send Free Radio Book and facta. Teli how I can pay for my course on mold makes dozens of novelties and gifts to nay Sell for $1.00 or more apiece! No experience easy payment plan after getting my 12 weeks" training. necessary. Everything furnished—complete in- structions. Start profitable business in your home . . . sell to stores, friends, neighbors, by mail. Make BIG MONEY full or spare time with SO-LO GO-MA. Write for complete FREE details and sensational Introductory offer. SO-LO GO-MA MOLD CO. Dept. K-834, Cincinnati, 0. NOW— Make These Attractive Ornaments and Gifts at Home 22 SCOTTIE RUBBER MOLDS Name - erus esu co CEEE TRANE Address sunenesuansanenenanceaans Town..... State. eese 30 Accept No Substitutest Always Insist on the Advertised Brand!

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PAINT SPRAY UNIT only *5% Suction feed gun, nozzle fine round shading spray to full round. — Tlandles paint, varnish, lacquer, etc. For moth- proofing, etc. Paints anything. Fine for "hard to get at places". Uses t4 H.P. motor which is not included. Complete with clean air compressor, 8 ft. air hose, tire chuck, spray gun and ali mounting only 85.95. Send only $1.00. Bal. C. O. D. Others up to $19.00 complete. STRIPE YOUR OWN CAR with a ROLL-A-STRIPE. Save the price of your striping joh and earn money doing others. Special knurled roller, dependable gauge. Uses paint, lacquer. enamel, varnish or heavy ink. Stripe signs, furniture, models, etc, Send for one today, Postpaid $1.50. s pu : MODCRAFT INDUSTRIES, Dep SOS HICAGD, lbs - of Bargains in Army, Outdoor and Sport Goods, , Clothes, Shoes, Boots, Blank- ets, Tents, Firearms, Boy Scout Supplies, etc. Send 10c for copy to bc redeemed on first order. ESTABLISHED 1868 A ^ 4813 Lester St. Richmond, Vas ~ SOLVE the Mystery «| of Watches and Clocks with our kit of genuine watchmaker's tools. “Get a KICK learning what makes them TICK"! Kit can also be used by machinists, mechanics, elec- tricians, ete. KIT $2.00. Watch Movement 50c postpaid. Distributors, Agents and Dealers write ONTYME WATCH COMPANY, Dept. B, P. O. Box 999, Chicago, Ill. SAVE MONEY ON YOUR TRAILERS Send a dollar for Trailer Designers’ Guide Dook. It includes 8 dis- tinctively different designs of trailers, their descriptlons and floor plans. A simplified model No. 800 with assembly plans, sections, de- tails, underbody sheet and stock list, including bolts and screws, building instructlons, suggestions as to what to invent for trailers, drawings of doors and windows, and how to bulld them. A variety of color sketches, trailer balancing instructions, ete. Mail a dollar today for this large book. D. VAN OOSTVELDT, I1! Marston, Dept. 33, Detroit, Mich. NOBOSS! SURE CASH! START OWN BUSINESS Resilvering mirrors. Replating tableware, reflectors. Refinishing chandeliers. Making Chipped Glass Signs. Experience unnecessary. Combination outfit furnished. Write—SPRINKLE, Plater, 855, Marion, Indiana. Grow Mushrooms in cellar, shed. Ex- elusive new process. Bigger. better, quicker crops. More money " for you! Start now, for best results. We buy mush- rooms. Book free. "edi AMERICAN MUSHROOM INDUSTRIES, LTD., Dept. 786, Toronto, Ont. Arrest Him, Officer! PLL HAVE COMPLETE FACTS ON THE OTHER FELLOW sania Foll This Man! 01310 VW is an: ECRET Service Operator No. 38 is on the job... follow him through all the excitement of his chase after the counter- feit gang, See how a crafty operator works. Tell-tale finger prints in the murdered girl’s room that help him solve the great mystery! BETTER than fiction because every word is TRUE. No obligation. Just mail me the coupon and get— FREE The Confidential Reports No. 38 Made to His Chief And the best part of it all is this—it may open iu eyes to the great opportunity for YOU as a well paid Finger Print Expert. This is a young, fast-growing profession. The kind of work you would like. Excitement! Thrills! Travell A regular monthly salary. Reward money, And remember: graduates of this school HEAD 47% of all Identification Bureaus in the U. S. Quick! Mail the Coupon NOW and I'll send you these Free Confidential Reports! INSTITUTE OF APPLIED SCIENCE 1920 Sunnyside Ave., Dept. 2351, Chicago, Illinois "ERUMNREENERNNSERRRENRNNRRRRERENERMS Institute of Applied Science 1920 Sunnyside Ave., Dept. 2351, Chicago, Illinois Gentlemen:— Without any obligation whatsoever, send me the Reports of Operator No. 38, also your illustrated Free Book on Finger Prints and your Tow prices and Easy Terms Offer. Literature will NOT be sent to boys under 17 years of age. Address H Age When Answering Advertisements Please Mention January Modern Mechaniz Hobbies and Inventions 31

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“TRAIN NOW for QUICK SUCCESS in and GAS Engineering DIESEI Raise Your Pay with “Job-Way"” Are you tired of lay-offs andlow pay? Do you really want to get into a business that offers good pay, and a real future? Then you want “Job-Way”’ Training—the training that has started thousands on the road to success. LEARN INE SPARE TIME B EARN EXTRA $ MONEY $ Good Jobs — Great Opportunities Rapid growth of Auto industry has created countlesa opportunitlea for trained service and repair men. And now, Diesel—the new cheap power for trucks, buses, tractors, engines—has opened up still greater fields of power development. Combined Auto-Diesel Training *'Job-Way'' alone gives you combined Diesel and Auto Training by & practical, easy method of home study and £ct"al job work. Thousands of our students have more thun paid for their training thru our exclus sive spare-time money plan. Mail Coupon for Free Book If you want big pay and want it quick, rush the coupon TODAY for FREE AUTO- DIESEL BOOK, with Fan facta about *'Job-Way'' Training, Free Employment Service, Free Motor Testing Equipment, liberal Pay- An Yon Plan, and positive Money-Back Agree- ment. MOTOR INSTITUTE of AMERICA Dept. AA-13, Chicago, Illinois ee — — — — ——— — —— — M eq D. F. GELLER, Pres, MOTOR INSTITUTE ! 4554 Broadway, Dept AA-13, Chicago, Minois . | Without ebligating me, send Free Auto-Diesel Book,with | full Sstalle of **Job-Was"' Training and ‘‘Pay-As-You- I ll —————— Address annan nann sen

“The Stanley Tool Guide”, tells how to use and care for tools. How to sharpen edge tools. How to make common cuts and joints in wood. Hundreds of helpful illustrations. 32 big pages.

"Things To Make In Your Homeworkshop' — 16 complete plans for making useful articles — detailed plans and list of stock required for each project. TELLS WHAT Send coin or stamps today for one or both of these helpful books STANLEY TOOLS 108 Elm St. New Britain, Conn.

32 Accept No Substitutes!

7424 POCKET RADIO. MUSIC SPORTS ENTERTAINMENT — FITS POCKET EASILY —7a4e Æ with you! Brings fn stations with beautiful clear lond tonef Incorporates such features as direct reception from radio — no dangling phones to bother with — single centrelized tuning which is the only moving part — covers broadcast band, etc. You should be thrilled with ita excellent, performance. Complete in one unit, just llaethebig sets—but weighs only 6 ozs. Re- quires no batteries, tubes or electrical connections. Costs Nothing to Operate—Nothing Else to Buy! Comes to you complete, all ready to listen, with simple instructiong for use in hotel, camps, office, home, bi etc., end take it with you while g. antos, bicycle . etc. Works immediately. Nothing to adjust. No diffieult hook-ups. Should last for years. A GUARA ED Rad SEND NO MONEY! 525,5,5.- sra * *'Cathed Radi oday—' a erformance—economy d practicability. Comes ip beautiful walnut color with Pitia hone and attractive tone grille in upper part of radio. Order now! Bethe Pagina! arrival only $2.99 and few pennies postage. er fret t Meny Midget 1981 Irving Park Bivd., Dept. 602, Chicago .QQPI Mighty Midget Radio PLAY PIANO Ist DAY With my new AMAZINGLY simple easy-to-Iearn . 20 lesson course you really PLAY piano the first day. "Then rapid progress, popularity, admiring friends. orchestra jobs. Results assured. Send now, 1st four lessons $1. Complete course $3. MUSICALLY correct, Satisfaction or your money back. START NOW. Ss HAMILTON MUSIC METHODS aAa Vg 5757 N. Merrimac Ave, MM, Chicago, IIl, IP MODEL FITTINGS Build the Mayflower Construction sets, fittings and blueprints for all popular models. We manufacture the largest and finest line of fittings for salling shlps, battleships, destroyers, whalesaips, motore boats, Marblehead (50-800) and Class A racing yachts in the U. S. A. Send 15c to-day for our 40-page illustrated catalog. A. J. FISHER 1002-5 Etowah Ave. Royal Oak, Mich. MAN IN EACH TOWN To Plate Auto Parts, Reflectors, Bathroom Fixtures, Refinish Beds, Mirrors, Chandeliers, by late method. Experience unnecessary. Simple plan of manufac- turing at home starts you in big money making busi- ness. Free particulars and proofs. Write today. GUNMETAL cO. Ave. P Decatur, Ill.

ONE-MAN SAWMILL E:S: °49 MODEL TURN TREES INTO MONEY WITH A BELSAW! Makes lumber, shin- 7 Three capacities: 10, 14 and 20 gles, lath, ties, crates, SA feet. Accurate set works, positive bozes, cases, <I} dogs. Full or one-way type power all forms feed runs on low power—manyown- era use old auto engine. Pays for itself quickly—thousands in com- mercial service, everywhere. Write for free lumber handbook and catalog of mille, supplies, tools, saw tables, and woodworking equipment, BELSAW MACHINERY Co. 834-G Davidson Bldg., Kansas City, Mo. No JoKE To BE DEAF =Every deaf person knows that- Mr. Way made hinbelt hear bis watch tick after ing deaf for twenty-five years, withhis Arti- He wore them day and night.

or batteries. Write for TRUE STORY. Also VP booklet on Deafness. Artifictal Ear Drum OMPANY w Sofmann Bite. WAYS Detroft, Michigan Splendid opportunities. Prepare quickly In spare time. Easy method. No previous experience necessary, common school education sufficient Many earn while pearniog.. Send ter free Booklet **Opportu odern Photograp articulars and requir 2 S'AMERICAN $CHOOL OF PHOTOGRAPHY 3601 Michigan Avenue Dept. 2051 Chicago, Ilinois Alwavs Insist on the Advertised Brand!

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In Your Present Stove or Furnace— HOTTER—CHEAPER—No Dirt or Ashes — Twice the Heat Quick at HALF THE COS1. COOKS A MEAL for LESS Beats any oil burner ever gotten out for low cost, perfect performance. Burns cheap oil 2 new way, without pre-generating or clog» ging up. Quick intense heat by Simple Turn of Valve. 2 AGENTS Try At Our Risk Salesian 30 DAYS’ TRIAL BIG MONEY| Z Prove it ends drud d lips "t = dirt of coal or wood; cuts fael Any STOVE. f Dilla in half, pays for Itself RANGE or“ : quickly by what IT SAVES, FREE SAMPLE FOR AGENTS FURNACE Quich HEAT at olered to one enerxetlc man Turn of Valve! Who wil demonstrate and take orders. Wri who wil lemonstrate an e orders. te quick, fi make REAL MONEY right now. &oare or full tine: mel Teisa ps UNITED FACTORIES, A-600 Factory Bidg., Kansas Clty, Mo. OO AMATEUR CARTOONISTS: WIN $2500 Wanted—Amateurs with humorous ideas. No drawing ability necessary. The amateurs of today are the pro- fessional cartoonists of tomorrow. Ideas judged and prizes awarded by Applause-O-Meter test before movie audiences. Everyone has an equal chance. 26 cash prizes in all. Rush name on post card for "Valuable Tips on How to Make Money With Simple Cartoons and Humorous Ideas," Cash Prize Entry Blank and Rules—Send No Money. Ere | BUILDERS’ - BE AUN A book telling how to build radio receivers and transmit- ters, and including scores of set building tips and trouble-hunt- ing kinks. PARTIAL LIST OF PLANS Police Cal! Adapter; Smallest All Electric Radio: io; Money. Writonow, 148 Pages Over 500 Pictures S 6-Tube Auto Radio; Hiker’s Portable Radio; Cigar Box Receiver; 5-Meter Transceiver; Crystal Sets; 3-Tube Toolbox Port- able Set; 1-Tube Short Wave Marvel: Antenna Plans; 2-Tube All-Wave Radio; Condenser Microphone; Lapei Microphone; Smallest Broadcaating Station; Special Code Transmitter. 50c ON SALE at Your News- stand or Send 50 cents for your copy to MODERN MECHANIX PUBLISHING CO. Greenwich, Conn. NW START $1260 to $2100 YEAR Men--Women Common Education Usually Sufficient Influence Not Needed Customs Inspector Salary $2,100 to start. Men 23 to 45. Work connected with examining baggage and merchandise entering the country from foreign parts covering boats, trains, roads, autornobiles, etc. ss CUSTOMS INSPECTOR City Mail Carriers, City Post Office Clerks Clerks and carriers now get $1,700 the first year regular and automati- cally increase $100 a year to $2,100 and $2,300. Open to men—women, 18 to 45. Railway Postal Clerks Railway Postal Clerks get $1,900 the first year regular, being paid on the first and fifteenth of each month. ($79.17 each pay day.) Their pay is automatically increased yearly to $2,450. Advance may be had to Chief Clerk at $2,700 a year. ($112.50 each pay day.) Open to men, 18 to 35. File Clerk—Clerk Open to Men—Women 18 to 50. Entrance salary $1,260 —$1,440 Year. Appointments as File Clerks and Clerks in the Departments at Washington, D. C., are made from this examination. Get Ready At Once Experience is usually unnecessary Many other positions. Let us show you and political influence is not permitted. how to get a government job. Free List of Positions Fill out the following coupon. Tear it off and mail it today—now, at once. i This investment may result in your getting a big-paid government job. FRANKLIN INSTITUTE, Dept. S261, Rochester, N. Y. Gentlemen: Rush to me, FREE of charge, list of U. S. Government big pay jobs. Send me FREE 32-page book describing salaries, vacations, hours, work, and full particu- lars telling how to get one of these jobs. Name —— Address When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 33

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WOE WATERS FORECAST DISASTER Nic Sprank Offers $5 For Best Oddity p E 9 P murare FINGER TIPS TO PLACATE THE GODS! THE TIP OF TRE RING FINGER OF THE BABIES OF THE XKOSA TRIBE IN AFRICA ARE AMPUTATED TO PROPITIATE THE GODS SO THAT THEY WILL PERT ae MOTHERTO BEAR MORE CHIL! “E.GORDON lee CAPETONNARIA Ha Dhue WOE WATERS OF YORKSHIRE, ENGLAND!—A MYSTERIOUS STREAM THAT APPEARS FOR A SHORT TIME EVERY FEW YEARS. IT APPEARED AGAIN DURING 1936. ITS_APPEARANCE IS SAID TO PRESAGE WAR AND FAMINE, A LEGEND DATING BACK TO THE IZ TH. CENTURT. E JOHN O'BRIEN, NEW YORK,NY. ' [FiSH BUILDS NESTLIKEABIRDI— — / a THE. STICKLEBACK FISH CONSTRUCTS A A j]! 2,700 COWS IN NEW YORK emvi— HOME FOR ITS MATE MADE OF S'EA-NEED, — ; P. 1 DESPITE THE HIGH COSTOF REALESTATE ANDTHE IGS AND AQUATIC PLANTS Y WO VEN Ee : SCANT SPACE,THIS MANY COWS ARE STILL MAINTAINED OER a FORET S co THIER FOR LOCAL CONSUMPTION. THEY ONIY PEGIN TO YMOND BYRNE, L L 3 RAYMOND B ; SUPPLY THE 3,060,000 QUARTS SOLD DAILY IN THE CITY.— GEORGE VAN DYKE, NEWARK, N..J. Five dollars will -be paid for the Oddity used by Nic Sprank as his central illustration. One dollar will be paid for all others used on this page. Send your Oddity to Nic Sprank, Modern Mechanix Publishing Company, Fawcett Bldg., Greenwich, Conn. Source or proof of each Oddity must be given. Send all Oddities separately, not with other manuscripts or letters. 34 Modern Mechanix Hobbies &

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CHEMISTS for INDUSTRY A Guest Editorial Apis question of "what does industry expect of its chemists," is one about which much has been written. There are certain factors that we must take for granted. We will assume that all courses are essentially the same. Such qualifications as good character, good health, neat áppearance, courage, dependability, and industry we expect in all prospective employes. Presupposing. a good technical background, one of the most important things is good personality. To me ; this does not mean merely a man. with a pleasant smile. . Emile F. du Pont It is really the characteristic that enables him to get t things done. In modern business it is not the lone wolf who achieves results but rather the combination of the efforts of the group. A characteristic which we regard as extremely important is loyalty. Considerable public good-will can be obtained by the contacts the public has with a concern's employes, and conversely, a great deal of ill-will can accrue if the employes are not loyal to their employer. Accuracy is another essential point which we require in our chemically trained men. It is important that when a man makes a statement that he states the facts as they are. The most successful man, of course, is the one who is entirely open-minded and willing to learn as much as possible from others as he progresses up the ladder. A technical education can be regarded as a tool in a man's equipment which will help him achieve his ambitions. it is generally necessary for industry to train young men to think in terms of money outgo and income. The young chemist who goes into manufacturing work at the start quickly picks up this quality because of his daily association with profit and loss in operations. To sum up, still presupposing that he has been subjected to a good technical course, we expect these things of a young chemist. He must have ` the proper personal qualifications to fit into and develop in an organization. He must have a mental , excellence as indicated by class standing and should have broadened himself by extra curricular activities. He should be loyal. He should have ability to speak and write clearly and concisely. He should be accurate. He should have some knowledge of the cost of doing business. He should have an understanding of modern industrial organi- Emile F. du Pont PERSONNEL MANAGER E. |. du Pont de Nemours & Co. Inventions, January, 1937 35

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This attractive $3,500 model residence is being con- structed by Modern Mechanix in Leonia, + five minutes' drive from the George Washington Bridge over Hudson River. It will demonstrate the ease with which the average man can finance and build his home. ONVINCED of the ease of building their own homes, Tom and Jim and their wives purchased their building lots. Now spread before them were the blueprints—the plans of dreams which a short while before seemed impossible. Yet they were fast coming true. Jim had a small grocery store, $3,000 in savings and two children for whom he was doing his best in a crowded city flat. Tom, on the other hand, was a clerk earning $1,200 a year. After many years of strict economy he and Mary had managed to save $1,600. Jim liked to find his recreation puttering about in a home workshop; Tom was an amateur photographer, with a passion for doing his own dark-room work. Their city flats did not afford room for their hobbies. They were discussing these one day when Bill Johnson, who worked in an architect’s office, showed them how his Boss could help them build their own homes which could be paid for at a cost cheaper than rent. Tom's home—a one-story, four-room house to be built at a cost of $3,500 in Leonia, N. J., a few minutes from the George Washington: Bridge that connects New York and New _Jersey—has been selected as a model home by this magazine, and construction is under way. . Tom learned that with $1,230 in cash—in- cluding $600 for his lot—he could secure a loan of the additional $2,870 necessary from 36 Architect helps builder obtain best for money. Specifications for the home call for a brick wood- burning fireplace in addition to a steam heating system designed to maintain an even tempera- ture of seventy degrees even in sub-zero weather. an independent building and loan association or one connected with the Federal Home Loan Bank or the Federal Housing Admin- istration. The loan, payable at $29 a month, must be paid back in ten years. Jim, because of his two children, required a bigger house. His two-story, five-room home will cost $5,500. Of this amount he has $1,890 cash, and must seek a loan of $4,410, which he must pay back at the rate of $45 a month for the next ten years. Since the day they decided they could afford to build their homes things had been moving rapidly. Everything was ready now to submit to the contractors. The blueprints of plans and elevations of both houses, with specifications fully ex- plaining just what must be built into the homes and how to do it, included all the sug- gestions that Tom, Jim and their wives had made. Modern Mechanix Hobbies &

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by Wesley Sherwood Bessell New York Architect All the ideas that they desired in a home were carefully worked out. The plans were drawn up to a scale of one-quarter inch to the foot, and were similar to the original smaller sketches but with such changes as they had carefully discussed. It was agreed that requests for estimates be made at once. “But what if the figures run more than our allowances?” asked Tom. “In that case,” Bill answered, “we usually weky landes Ben the author is i : T T nown for the omes, schools am postofhces call in the two lowest bidders and suggest that desigaed by Bin in recent years in Long Island certain modifications be made in the plans and New Jersey. and specifications whereby the cost can be = 1. ,. aaa brought within the allowed amount. Or, if a necessary, we make up an entirely new set of plans and specifications cutting the room sizes and thereby reducing the cubage, to- gether with other changes, and send these plans out for new estimates." He went on to explain that the architect usually assumes the responsibility for the second set of plans, and that there is no charge for the additional work. He added az à that an architect endeavors to obtain as much for his client as he can, including the best and latest improvements. If all these come within the allowance, so much the better, but if figures are higher, he pointed out, he knows of savings he can suggest to the builder. “Well,” said Tom, enthusiastically, “every- DER thing seems to be in fine shape. To whom do . 1e] EXCAVATE 2'6” BELOW FINISHED GRADE - ROUGH CEMENT ua PORCH l FOUNDATION l FOOTINGS Y 19! + 4" LALLY COLUMN STEP FOUNDATION SHINGLE ROOF STUCCO — CELLAR PLAN = These drawings show base- ment and foundation plans for the home. Concrete " " = HER blocks will be used. for the Ed 5 ie foundation walls. Base- © SSSPORCH FOUNDATION 75 by O ; H ment walls will be made Ee ee eee et y watertight by cement mor- ERENT : : tar inside and outside. ENTRANCE SIDE ELEVATION Inventions, January, 1937 j -37

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FRONT ELEVATION These drawings show front, cear and north elevations of $3,500 MM home under construction in Leonia, N. J you send the plans?" Bill said that his office had a list of contractors in that particular locality whose repu- tations were A-1, and that seven of them would be informed that plans and specifications for Tom’s house were ready, and asking if they de- sired to submit an estimate. The plans and specifications then would be for- warded to them, with instructions to have the bids back in the architect's office on a specific date. In Tom's case he said a two- weeks limit would be sufficient on bids. The contractor, Bill went on, estimates on everything, including plumbing, heating and electrical work. By having one man respon- sible for the erection and completion of the entire house, Bill explained, the architect is unaware of the wrangling between sub- contractors, if one should be inclined to blame the other for delays and holding up of the work. The general contractor, he pointed out, thus co-ordinates the various trades and sees to it that everything is kept moving. Bill then detailed what he meant by supervision of the work by his office, explaining that he will visit the job once a week and inspect all the work and material. "I will know whether or not we strike water when we excavate; when the footings are placed, I will see that the concrete is of the correct mix and placed at the proper level. I must make sure that the proper ma- terials are used in the foundation walls, and that the work is well constructed. After that the floor beams and wall plate are put into place. The plate must be secured to the 38 PORCH FOUNDATION a ay aa a pene IE EE EXE m foundation walls by anchor bolts, and the floor beams must be of the specific sizes and grades. These must be properly spaced and cross-bridged. The exterior framing, such as studding, rafter plates, attic beams and rafters must all be checked. “Then comes the sheathing and roof lathing for shingles. Wood shingles will last some 20 to 25 years. I have seen some shingles 100 years old. While this work progresses the plumber, the steamfitter and the electri- cian will start their rough work, putting in piping and wiring. This must also be in- spected, and in the case of the plumber, when his work is all roughed in, he puts on a test for my inspection. “These same mechanical contractors also must be watched when cutting beams in order to run their various pipe lines. You can only cut a certain amount of slots out of a beam or stud with safety. Too deep a cut becomes dangerous. Very often the plumber, or steamfitter, is interested only in getting his pipes to the desired spot for his work, and will cut too deep into structural beams or studs, weakening them.” Modern Mechanix Hobbies &

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SHINGLE ROOF ji ow V TM ? Sun. ete ada. X ae This illustrates the type of model residence which can be built for $5,500. There are two floors giving ample | | GRADE room for 2 growing family. This is a back view. | | ASH PIT FOOTING | ise pat he tn “There seems to be a great deal to know about and to watch out for,” remarked Tom. “You are correct there,” said Bill. “These things are only a part of the many details that come under the scope of proper supervision. Without supervision many things can be covered up, and these defects only become apparent as time goes on.” At the end of three weeks the final esti- mates were received. Both Tom and Jim were eager to know the outcome. “It is like an election—you don’t know the result until all the figures are in,” said Jim. “But the news is not so encouraging for you, Tom. Your figures ran considerably over your allowance.” Tom was disappointed, but realized that such things happen, and so was ready to abide by Bill’s advice and be patient. At a second meeting two weeks later, Tom was told that, by using coal for heating in Inventions, January, 1937 — FRONT ELEVATION— These drawings indicate the front elevation, window arrangement, cellar plan and similar features of the more expensive house which is being described in this series of articles. place of oil; substituting stucco for , the brick veneer; simplifying the waterproofing, as the contractor assured Bill that the cellar would be dry in this particular location; reducing the size of the house by one foot, and a few other minor changes, the work could be started at once. The contract made between the contractor and the owner was the standard form of agreement issued by the American Institute of Architects, and which is recognized in all courts. It covers the time of completion, the contract amount, the time of progress payments, the final acceptance of the job and the final payment. That night Tom and Mary pored over the Specifications and general conditions of the contract they had signed, and were more and more elated over the splendid little home they were about to build. "Jt seems almost unbelievable," remarked Tom. "Although we are putting everything we have in it, I didn't think you could get much more than a shack for what we could afford. Yet no more pains could be taken to make the house perfect if it was costing a hundred times as much." They thought they could hardly wait until the workmen started the excavation for the [Continued on page 153] 39

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Huge Machine Builds Road In Single Operation Taking in road building material at one end, thís huge gasoline-driven engine mixes them and proceeds to lay a farm-road pavement at the rate of one mile per day. Typewriter Has 2,000 Keys N INGENIOUS typewriter containing 2,000 Japanese ideograms besides the usual assortment of Roman characters for European languages, has been invented by Hizen Izutsu, teacher at a vocational school in Osaka, Japan. Despite the enormous keyboard capacity, the novel typewriter is smaller than many ordinary standard typewriters previously in use. The machine sells at about $50. Simple in operation, there is but one type- lever. It picks up the type, one piece after the other, from a movable lettercase, and places them back immediately after the touch is performed. Hizen Izutsu, Japanese inventor, watches a student operate his new typewriter. It has a keyboard of over 2,000 letters and types notes in both Japanese and European languages. 40 RAVELING at the rate of one mile per day. a big self-contained paving plant on wheels gulps up road building material at its front end, thoroughly mixes it with bitumin, and dis- charges it at the rear in the form of a finished 20-foot wide "farm-to-market" type pavement. The machine is operated by powerful gasoline engines and travels on crawlers. Manufactured by the Barber-Green Co., of Rockford, Ill, it is widely used in the arid districts of the West, where it uses the desert sand, one of the principal ingredients of the road building operation. The speedy road paver is economical. College Has Study Enforcer This study enforcer scoops up a book and places it before the student. Built 75 years ago by John Muir, famed naturalist and writer, it is owned by University of Wisconsin. N OLD machine owned by the University of Wisconsin is called the study en- forcer. The unusual device is actuated by a clock-like mechanism and its mechanical fingers scoop a book off the desk and return another one until the student has completed reading the scheduled volumes. Modern Mechanix Hobbies &

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Air Commerce Bureau Adopts SERIES of radio-operated teletype- writer machines over which weather reports can be transmitted simultaneously without the use of wires is being installed along the Washington, D. C.-Nashville, Tenn., airway route by the Bureau of Air Commerce. The machines have been in experimental use between Baltimore, Md., and Washington for the past year and a half. The typewriters can also be installed and operated from transport planes, the weight of the machine being insignificant, particularly since it would insure against error in the receipt of weather reports. At the same time the machine provides a permanent record of the reports. Installation of the machines will cost about $200,000, but it is expected that the savings effected will make up the cost within a period of three years. Blind Man Remodels Home Although totally blind, M. F. Jones, of Tampa, Fla., re- modeled his large five room home into a modern building con- sisting of eight apartments. He did all carpentry work unaided. VERCOMING the handicap of being blind, M. F. Jones, of Tampa, Florida, remodeled an entire house unaided. One of the features of the job was the removal of an enclosed stairway and the rebuilding of it on an outside porch. Before losing his sight, Mr. Jones had been a construction foreman. Inventions, January, 1937 Radio Typewriters The Bureau of Air Commerce will use radio-operated teletype- writers like these to send weather reports to airports and air- planes. R. B. Ladd demonstrates device at Silver Hill, Md. Newsboys Wear Neon Signs EWSBOYS who sell the Los Angeles Times are supplied. with. small neon electric signs having the. word “TIMES” in capital letters. "The signs, worn at night, Stand out in traffic and protect the boys against possible accidents from passing autos. The signs were designed by A. A. Allen, an electrical engineer, and will burn steadily for 48 hours without changing the dry cell bat- tery. "These signs, besides protecting boys, attract pedestrians and increase sales. Powered by small dry cell batteries, neon electric signs worn by newsboys for the Los Angeles Daily Times protect them from pos- sible traffic accidents in darkened streets and help increase sales. 41

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by Aubrey D. McFadyen ENATOR WILLIAM G. McADOO'S fingers were burned at a picnic when he picked up a metal thermos bottle cap-cup full of hot coffee. So he went home and invented a heat-proof cap. The Senator's latest patent covers improvements in the familiar safety razor—the new razor being constructed so that the blade can be inserted or removed without taking the razor apart. To such casual inventors the world is indebted for most of the 2,059,187 inventions patented in the United States during the 100 years existence of the American patent, system; ‘the centennial of which was observed in Washington on November 23. i Everybody; from Presidents to prisoners, has been in- venting allómanmers of things. It excites little wonder 4S whem an emitent pianist patents numerous automobile S Wee C ARE structure, or when a pugilist patents a monkey wrench, or even when a scion of one of the nation's George Washington, pictured wealthiest families patents a shoe found dme in he versatile 4, BOliShing device. The name of career to invent a seeding , Dr. Albert Einstein is so much in plow, a wine coaster and other =< x 7 d à " farm devices. Samuel Clemens, | the daily print in connection with famed as Mark Twain, pic [E 4A tured at right. invented the [gh self-pasting scrapbook which 2i can still be purchased at sta- tionery stores. The illustration is from his patent. He also invented an adjustable strap for the backs of waistcoats and trousers.

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LU E 48 à 7 à 9 MAS ws? tionary. | Edm WU, "P N^ re r D F "c : s = s d his theory of relativity that when he patents a novel refrigerating system it is not even regarded as news. When one reads that Thomas A. Edison patented 1,101 inventions, that John F. O'Connor, Chicago rail- way engineer has patented 968, or that Carleton Ellis, Montclair, N. J.,-chemist, has patented nearly 700 in- ventions ,the conclusion is immediately drawn that pro- fessional inventors are the backbone of the Patent Office. Nothing is farther from the truth. Men like John F. O'Connor, Elihu Thomson, Carleton Ellis, Henry A. Wise Wood, Clyde C. Farmer, John Hays Hammond, Jr., and Ethan I. Dodds—all living inventors, each having patented over 300 inventions—are the ex- ceptions. For every professional inventor there are hundreds of amateur or casual inventors. In fact, by reason of the inexperience of the casual in- ventors, and their tendency to dabble in fields in which they have little or no NS experience, frequently their ideas have been the more . A LOW radical and révolu- **- p Abraham Lincoln, famed for far differ- ent things, in 1849 invented and pat. ented a system of buoyant chambers designed to help boats clear shoals in the Ohio and Mis- sissippi Rivers. He was inspired by the [ties of navi- ts which he wit- sed in the course ofaa flatboat trip to Ni Orleans. A üodel is preserved the Patent Office. iu wis, i

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Cartwright, a clergyman and poet, invented the power loom; Eli Whitney, a New En- gland school teacher, conceived the idea of the cotton gin while sojourning in Georgia; Richard Arkwright, a barber, invented the. spinning frame; the Wright brothers, inven- tors of the airplane, were bicycle mechanics; Samuel Segal, inventor and founder of the lock company which bears his name, was a New York City policeman; while the auto- matic telephone exchange is credited to Al- mon B. Strowager, a Kansas City under- taker, who thought a rival had bribed tele- phone operators to bungle his calls! Because of the same inexperience—many ideas of the casual inventors have not been adopted commercially. That is true, for ex- ample, of the sole invention patented by Abraham Lincoln—the original model of which is one of the few preserved by the Patent Office in Washington. As a young man Lincoln had made the trip by flatboat down the Ohio and Mississippi rivers to New Orleans, and had noted the trouble of navigators on the shoals. After steamboats had begun to replace flatboats he conceived the idea of attaching buoyant chambers, much like huge bellows, to the sides of the boats, to be inflated or otherwise Glenn S. Warner, the veteran football coach, has patented a shoulder protector and other gridiron equipment. n : as a Senator. 44 William Gibbs McAdoo is an inventor as well He has devised a heat-proof cap for a thermos bottle and not long ago patented a safety razor improvement. Natacha Rambova, once wife of the late Rudolph Val- entino, holds a parent on a combined cover- let and doll. forced open by the power of the engine when the steamboat went aground on a shoal. The added buoyancy was supposed to lighten the draft of the vessel, so that it would float off the shoal. Lincoln was not the only man to become president of the United States who did a little inventing on the side, though he was the only one to take out a patent. George Washing- ton and Thomas Jefferson, for Ses were both inventors. Jefferson originated the folding busgy top; also the swivel chair and the modern plow- share, to mention two still in use today. The original of another of his inventions—a writ- ing desk with an adjustable top—is in the Smithsonian Institution at Washington. Be- cause of Jefferson's inventive and scientific traits, the duty of passing upon applications for patent was delegated to him in the early days. George Washington's inventions included a "wine coaster," a seeding plow, and other farm devices, - all of which are the

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recorded in his diary. In the entry of March 26, 1760 we find this entry: “Spent the day in making a new plow of my own invention." Further entries read: “March 27. Set plow to work and found she answered very well in the lower pastures." “Apr. 5. Made another plow, the same as my former, except it has two eyes, and the other one." Neither Washington nor Jefferson turned their inventions to commercial account. In those days it was considered beneath the dignity of a gentleman to ac- cept remuneration for inven- tive effort. Benjamin Franklin, however, not regarding himself as a “gentleman” in the parlance of the day, did not hesitate to exploit his inventions. On his copper plate press was printed the first paper money used in New Jersey. He first devised spectacles with double lenses, for reading and distance; he also invented a mangle for pressing linen, and the renowned “Franklin stove,” a sort of cast iron fireplace which could be set up in the room and connected by pipe to the chimney. It was the first heater in which most of the heat did not go up the chimney. Among the American men of letters the late Samuel L. Clemens stands among the very first in the affections of the reading public, but few know that Mark Twain was an amateur inventor, and that one, at least, of his inventions made money for him— Ec Cornelius Vanderbilt, Jr., the journalist, is recorded in the Patent Office as inventor of a shoe polishing device the size of a large fountain pen. The barrel holds the polish. Secretary of the Interior Ickes holds a patent on the dahlia pic- tured at the left. Plant patents are a comparatively recent in- novation at the Patent Office but since legalization six years ago over 200 have been issued. though he lost more money on another man's invention. Clemens financed an inventor named Paige, who had worked out a type-setting machine; Mark Twain’s own experi- ences as a printer interested him in the problem. One machine was completed at a cost of $1,300,000; it is now on exhibit at Columbia Uni- versity. But before Paige's machine reached the com- mercial stage Ottmar Mergenthaler's much simpler and cheaper slug casting machine— : the linotype—was on the market, and all of Clemens’ investment—$190,000, constituting most of his wealth—was lost. Dejected, Clemens wrote to the publishers of a book in- tended to aid inventors: “If your book tells how to exterminate inventors, send me nine editions.” i Three patents were issued to Mark Twain himself, however. The first was an adjustable and detachable strap for the backs of waist- coats and trousers. Then in 1873 Clemens took out a patent entitled, “Mark T'wain's: Self-Pasting Scrap Book," which can still be [Continued on page 134] 45

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PROVING WOMEN ALSO HAVE IDEAS Mrs. Sophie Baikusis, above, is the most inventive employee of the General Electric plant at Schenectady, N. Y. The widowed mother of two children, she has earned bonuses with 80 sugges- tions since she went to work in the radio department 9 years ago. Miss Inez E. Matthews of Oakland, Calif, above, is the inventor of the “Ice Box” flower, widely marketed imi- tation flowers which freshen when re- frigerated. The idea occurred to her 4 while studying art in Paris. Though only 14 years old, Miss Jane Plant of College Park, left, worked as a "grease monkey” at the Candler Airport in At- lanta, Ga., during her vacation. As &.' soon as she is old enough she plans an X air career. Mrs. Mary Brusseau of ; Windsor, Ont, is shown below with the illumiphone which she has invented for telephones. It is a combination telephone stand of modern design which lights upon lifting of receiver. A two-way switch permits light to be turned on without lifting the receiver. Queen of women inventors is Miss Beulah Louise Henry of New York, above. She has earned the title of "Lady Edison" with 43 patents in the past decade for inventions ranging from dolls to sewing machines. One of her most unusual products is a snap-on parasol which pertnits a woman to have an umbrella to match each frock. She also has devised many things for the aid of office workers. 46 Modern Mechanix Hobbies &

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Pilot Uses Inflated Suit On Record Altitude Hop EARING a specially designed high altitude flying suit and pileting a Bristol 138 airplane equipped with a supercharged Pegasus engine, Squadron Leader F. R. D. Swain, of the Royal Air Force, established a new world's altitude record of 49,967 feet at Farnborough, Hants, in England. The flying suit worn by pilot Swain consisted of a rubberized fabric oversuit fitted with a hel- met of the same material in which a curved double-glass window was fixed. The suit, when inflated, was designed to maintain normal atmospheric pressure on the lungs of the wearer regardless of alti- tude. Squadron Leader Swain was complimented by King Edward VIII, for set- ting a world's record. It was necessary for him to surpass the French altitude record of 48,698 feet by a margin of at least 984 feet to obtain recognition of his new record. Pullman Cars Go Modernistic The new Pullman observation cars are roomy and comfortable. Steel alloy bodies and aluminum alloy interiors, comfortable seats, venetian blinds, and indirect lighting are featured. OMFORTABLE modernistic furniture and indirect lighting for night reading purposes are features of the new steel and aluminum alloy Pullman observation cars. A buffet containing a broiler, coffee urn, and a refrigerator is also featured. An observation parlor seating six persons is located at the rear round-end of the car, and a lounge seating 20 persons on sofas and seats occupies the remaining car space. Inventions, January, 1937 Above—The figure in the airplane ia not a robot pilot despite its mechanical appear- ance. It is Squadron Leader F. R. D. Swain returning from the al- titude flight in which he attained a height of 49,967 feet, establish- ing a new world’s rec- ord. Pilot Swain ‘is wearing the specially designed inflated flying suit that helped main- tain normal atmos- pheric pressure on his body despite altitude. Right—A close-up of Squadron Leader Swain and rubberized oversuit he wore on the flieht. Saddle Clamp Is Removable OMPOSED of two saddles, each drilled and tapped for a feed screw, a removable workshop clamp has been developed by C. P. Stuart, of Gorham, New Hampshire. Each saddle has two wedged shape jaws with three diagonal teeth that bite into the wood or metal beam to which the clamp is to be attached. Each of the wedges has a pawl attached to its backside which engage teeth in the side of the saddle. This maintains the saddle in position while being used. The pawls can be turned half around enabling the user to re- move the clamp after stress is re- moved by simply bumping the back of clamp. This removable saddle-clamp de- vice can be used two ways—as a clamp for holding work together. or as a jack to force work apart. 47

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What workshop fan wouldn’t be thrilled to receive this lathe on Christmas morning? Popular priced, the lathe features several new attachments which are usually found only on the more expensive metal turning lathes, 48 SORA SERRE A le a MRKE YOUR OWN ToYS hand picture will make an excellent gift for ` the entire family. The table can be used for utility purposes with a reading rack as an extra | feature. For the creative youth a metal cast- ing outfit will provide him with many hours of pleasure. The casting outfit pictured at upper right comes complete with lead pigs, moulds, enamels and ladle. Another Christmas sug- gestion for the outdoor boy is the sundial and | compass equipped rifle shown directly above. [ | The unique end table shown in the upper left- | | | This is not a pedal-car, but a real miniature auto- mobile with a gasoline motor. Provided with real balloon tires it is the first midget in low priced field. Modern Mechanix Hobbies &

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Auto-Yacht Features Aluminum Hull Construction OWERED by a standard automotive- marine type engine, an aluminum Auto- Yacht has been invented by Roy Applegate, of San Francisco, Calif. Its construction com- bines a home, auto, and yacht. The eabin is furnished like an apartment with sink, electric cooking stove, radio, elec- tric refrigeration, etc. The windows are non- shatterable and can be made water-tight by means of wing nut adjustable bolts. All wheels steer by use of specially de- signed equipment and can make a perfect arc: when turning. In the event of a long water cruise, the wheel assembly can be easily re- moved and replaced with plain smooth plates. Twin screw propellers motivate the Auto- Yacht when used in the water. Blow Torch Thaws Switch » baec dtr: Developed in cooperation with the U. S. Forest Service this gasoline blow torch has an overall length of 41 inches. It is used to destroy weeds along tracks and to thaw frozen ewitches. HAWING frozen railroad switches is quickly accomplished with a new blow torch developed by Turner Brass Works, Sycamore, Ill. The device shoots a hot blue flame downward at the ground for 2% hours on a tankful of gasoline. Inventions, January, 1937 Top-The Auto-Yacht invented by Roy Applegate of San Fran- cisco, Calif. Built mainly of lightweight aluminum it incorpo- rates the advantages of auto and boat. Bottom— Plan view. Machine Aids Beet Farmers EIGHING 3,000 pounds, a new machine developed by John Devey, Jr., of Glen- dale, Calif, may revolutionize beet farming. In one operation the new machine slices the tops from the beets and digs them from the ground at a speed that is 60 times faster than the job can be done by hand workers. Neatly topped, the beets are laid on the ground ready for loading. The application of the device to beet farm- ing is expected to reduce the farmer's pro- duction cost inasmuch as fewer hired hands will be needed to harvest the usual crop. It will also shorten the farmer's work day. This beet farming machine slices tops off beets and digs them from ground 60 times faster than can be done by hand labor. John Devey, Jr.. of Glendale. Calif.. invented the device. 49

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AROUND the WORLD — by H. R. Ekins First Man to Circle Globe Via Air Lines T TOOK a flight around the world, entirely by air, to bring home to me the tremen- dous strides made by commercial aviation in the last ten years. For me the journey of little more than 1842 days, during which I flew a route of approximately 26,000 miles, was a study in aviation as it is today com- pared to what it was only a few years ago. On my journey I used eight aircraft in all. The first was the German dirigible Hinden- burg, the latest development in the science of lighter-than-air craft. The designers, builders and operators of the Hindenburg expect, however, that soon it will be sur- passed by new giant ships of the air. 50 The other seven aircraft were of the heavier-than-air type. Three were used in the United States. They were twin-motored Boeings of the United Airlines and Douglas DC-2’s of TWA—Transcontinental and West- ern Airways. The three planes which took me all the way from Frankfort, Germany, to Manila were made by Douglas, and the long trans-Pacific hop was aboard Pan-American Airways’ “Hawaii Clipper,” the big four- motored flying boat built by Martin and powered by Pratt and Whitney. The aircraft listed above are the most modern and most efficient available to the civilian traveler. The study in contrasts. in-

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lines. ARE : | Six years ago, when I was flying around 2s | the Far East as a war correspondent for the United Press, the most powerful of the air- cooled radial engines of the Wright Cyclone type, were rated at about 525 horsepower. In 1930 it was believed, on the basis of ex- perience and research with the material then available, that it would be decidedly imprac- tical to build an engine rated at more than 600 horsepower and stil maintain even a vestige of dependability. Dependability in those days meant an engine that would operate for 250 hours between routine over- hauls. By 1931 the power of the Wright Cyclone was increased to 575 horsepower by using slightly larger cylinders to obtain in- creased cubic inch displacement. During the d same year advances in metallurgy and knowledge led engineers to believe that they had underestimated the possibilities of engines of the radial type. To jump a bit to the advances which had been made by the time I was ready to take off from Frankfort for the Orient I should like to point out the following: All the way from Frankfort, Germany, to Batavia, Java, flying in only two planes, I flew | behind 890 horsepower F-50 Cyclone engines. | The plane of the Royal Netherlands-Indies | Airways, which took me from Batavia, Java, to Manila, was powered with 715- horsepower Cyclones. When TWA flew me across the continent on the last leg of the journey they used a Douglas plane, : | sofar as airplanes were concerned, began at | Frankfort when I boarded a big Douglas air- | plane operated by KLM—Royal Dutch Air- Above-—-The TW A Douglas s transport plane that carried kins part way on his round- the-globe dash. Right——Ekins being congratulated by Miss F. W. Wilkins, TWA plane hostess, upon completing his race at Newark, N. J. Below —Dutch (K-L-M) Airline Douglas transports carried Ekins from Frankfort, Ger- many, to Batavia, Java. ae on. KONINKLYKE rive ». mm

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The route followed by Ekins on His record making flight, using only commercial airlines, is graphically shown above. The safety and comfort of American air- planes was Ekins’ outstanding impression of the flight. the Sky Chief. It was powered with F-50 Cyclones of an 890-horsepower rating. The series F engines go back to 1932 when the Wright Aeronautical Corporation an- nounced the development of engines rated at 700 horsepower at sea level. They weighed only two-tenths of a pound per horsepower more than the one pound per horsepower weight which the late Thomas A. Edison said was ideal for an aircraft engine. The suc- cess of the Cyclone F was immediate. 52 Above—The German airship, Hindenburg, over N. Y. City. Ekins started his now famous trip from Lakehurst, N. J., aboard the giant dirigible on Sept. 30. Little more than 18'% days later, he circled Lakehurst in a TWA transport plane en route to Newark, N. J., having girdled the globe. Its first commercial application was in the fleet of Douglas Airliners with which TWA equipped itself in 1934. The American and Eastern Airlines followed suit. Strangely enough, most of this I learned while flying with Dutch pilots across Europe, the Near East, and India to the Far East. While flying over scorched, monotonous deserts I learned that in 1934 the leaders of Dutch commercial aviation were following developments in America closely. KLM negotiated with TWA to purchase one of its ships. TWA had the Douglas production tied up with priority rights. The Dutch got their ship. Cyclone pow- ered, it was used by two KLM pilots, Par- mentier and Moll, in the McRobertson Lon- don-to-Australia air derby that involved 12,000 miles of flying. They took second place in the speed race and first place in the handicap division. By the time the race was over KLM had ordered a fleet of Douglas planes, all powered with Wright Cyclones. The performances of Cyclones in Douglas airplanes used to establish records both in this country and abroad caused the Douglas Company to standardize on the Wright Cy- clone engine for airliner installation. Of Modern Mechanix Hobbies &

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more than 150 Douglas airliners now in use only one, I believe, is powered with other than the standard engine. It was the dependability of airplane en- gines that impressed me most as I flew around the world. I was actually in the air 8 days, 10 hours and 26 minutes, and to a man anxious to get home swiftly, yet safely, the matter of dependability was of utmost im- portance. The motors behind which I flew in my early days as a passenger in airplanes would run dependably for only about 250 hours before overhaul Now they will run at least 400 hours. Dutch engineers, great enthusiasts for American airplane power plants, told me that operation of 700 hours without overhaul is possible. Several developments, I found as I flew, are responsible for the high efficiency of the mechanical facilities which enabled me to get around the world as fast as I did. They in- cluded the dynamic damper, a patented de- velopment removing all vibration from the engine. There were also improvements in cylinder head designs and better cooling which marked an important step towards in- ereased power. In this connection we can look forward to further advances in super- charging which will allow greater power, [Continued on page 150] Inventions, January, 1937

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A violinist can play his own accompaniment and make a phonograph record to prove the unusual feat with this device, invention of Prof. Vladimir Karapetoff of Cornell University. Bus Ads Shown On Screen EALIZING the need for an advertising medium in transcontinental busses, Joseph E. Houck, a San Diego, Calif., adver- tising man set about to design a device that would meet the special requirements of modern busses. Since placards were unsuit- able, due to lack of space for mounting, he struck on the moving picture projector idea. National advertising matter photographed on Technicolor film and projected on a trans- parent screen was the answer. Two thousand busses will be equipped with the device. Installed over driver’s seat thie new advertising medium for busses projects advertising and movie scenes on a transparent rubber screen. 34 Inventor is J, E. Houck of San Diego, Calif. Russian Invents Double Recording Discs VIOLINIST playing his own piano ac- companiment or a vocalist harmonizing as a trio may sound incredible, but it is quite possible according to Professor Vladimir Karapetoff of Cornell University. The eminent Russian scientist has perfected a de- vice which makes it possible to record as many as three different instruments or voices on a single phonograph disc. Provided with earphones, a violinist can accompany a piano rendition previously played by himself. When the recording is played back both violin and piano will harmonize. It is possible for the musician to add a third instrument to the recording, pro- ducing a stringed trio rendition. A singer who can sing alto, mezzo soprano and soprano can blend her voice into a trio when recorded on the unusual apparatus. Prof. Karapetoff's instrument uses regular home recording blank discs which are cut with a special elec- tric pick-up. Records are played through an amplifier. How many of these questions can you answer? After testing your skill turn to page 130 for the correct answers. 1. What purpose does a rectifier serve in an al- ternating current circuit? . Is it possible^to weigh air, or doesn't it have weight? . What is a hydraulic ram and for what purpose is it used? . Name the two kinds of energy and tell the dif- ference between the two? . Why are gold and silver coins produced on a punch press instead of being cast in a foundry? . Does sound travel faster through the air than it does over electric wires? . What is a Centrifuge? used? . In what manner is the Wheatstone Bridge used in electrical work? . Can nickel, zinc and copper be magnetized or, if just one can be, which? . What holds a so-called vacuum cup to the article to which it is stuck? . If two strips of metal, one aluminum and the other copper, are heated simultaneously, which will expand the most? . Can a liquid be cooled to a temperature lower than its freezing point without having it solid- ify? For what purpose is it i: on WD UW BP UN [2 Áo Hn N Modern Mechanix Hobbies &

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LOVE OF MAN FOR DOGS EXPRESSED IN BUILDING CANINE CEMETERIES Circle—-Pets of Princess Lobanoff are buried under this monument in an island dog ceme- tery in the Seine River, near Paris, France. Above--Irene Castle McLaugh- lin, famous dancer, erected mon- uments in memory of her pets in the dog cemetery at Hartsdale, New York. Below—-Pine Ridge Dog Cemetery, Dedham, Mass. Inventions, January, 1937 DEDICATED TO THE MEMORY SERVICES RENDERED iw THE WORLD WAR - “1914 — 1918 Man’s gratitude for the unselfish companionship of dogs extends even to the grave. Above—A tombstone in the dog cemetery at Hartsdale, N. Y., built in memory of dogs who gave their lives in military service during the World War. Above-—Love of dogs who endeared themselves to their masters is universal. Here are two Japanese dog lovers visiting the grave of their pet at one of Tokyo's three dog cemeteries. 55

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| More Marvels In 1837 Gars Lincoln's first Zephyr type coupe has striking lines modifying the air-stream upper body of last year's six-passenger cars. The coupe’s single seat is amply wide for three passengers. Resembling the latest | planes, France's Peu- | got, above, attracted | wide attention at the | Paris show; also. fea- | turing an aerody- | namic design was It- | aly's Bugatti, right. Britain is still going in for midget autos, and latest is the "Scoota-car Special," which has a top speed of 45 m.p.h. and can get 80 miles on a gallon. The new Ford, with its front like the rakish prow of a boat, and "tear drop" headlights set into streamlined fender aprons, makes it bow. The hood is hinged at the back, lifts from the front. ut lon Modern Mechanix Hobbies &

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Ottawa Observatory, where F YOU live long enough you may yet reach China without taking train, steamer, plane or rocket. For both North and South America are suspected of drifting over that way and scientists are figuring how long it will take, and observers from many parts of the world have sent in their reports to Paris for comparison. Preliminary figures over a seven year in- terval do not show us traveling westward, but, say scientists, the drift is so small the human error factor in the many observations may be just enough to counteract the drift. And so they still cling to the hope that the Americas are on a westward journey to join Asia. In 1926 and again in 1933 stations were set up at Greenwich (England), Ottawa, Van- couver and Tokio in a northern chain, and at Algiers, Washington, San Diego and Shanghai in a middle zone. In addition, many other observatories throughout the world took part. In 1926 there were over 40 observa- Inventions, January, 1937 ARE WE DRIFTING TO CHINA? Meridian circle transit instrument used in measuring possible shift of North America toward Asia. At left is shown a wireless receiving station at special observatory. tories at work on the theory and in 1933 about 100 took measurements. All these observations are being taken to prove or disprove the Wegener theory that North and South America once were joined to Europe and Africa. Because of the inter- locking jig-saw shape of the four continents, geologist Wegener advanced the theory that the four continents.and Australia were once one land mass. The observations, taken with a large as- sortment of instruments, wireless signals, and the help of the stars, covered between two and three months in 1926 and 1933. Each observatory completed a preliminary compu- tation and then handed the whole thing over to the International Time Bureau at Paris, where the final results are being compiled. According to the theory, the continental drift amounts to two or three feet per year. The amount is largely guess work, however. But on the assumption that the amount is right, it would take 50 years before the Americas moved 100 to 150 feet towards China. Which is not a large amount on a continent measuring 3,000 miles. 57

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The oscillograph, an instru- 4 h ment that "sees" through steel, f is used to detect hidden flaws. A 1 Within the thickness of the pencil in ; Ne I | the calipers, 20,000 thin razor edges 1 poc 1 can be stacked. Each edge is one-eighty-thousandth of an inch. AKE a look at any group photograph of half a cen- tury ago. No matter what their station in life, the faces of the men you see there will be adorned with luxuriant crops of whiskers. Some were clipped plain, with the simple dignity of a cemetery hedge. Others were brushed and trimmed in weird and wonderful designs, like decorations on a wedding cake. Now take a look along the street—any street in almost any country. You see a new race of men entirely. You can really see their faces, and they are bright and clean. No more of this hiding behind the bush. Their jaws are as bare of foliage as an oak tree in January. Has science given us a new race of whis- kerless males? You know it has not. The whisker crop is as bountiful as ever, but it is harvested earlier —harvested every morning by the majority of men throughout the world. Now the only conclusion we can draw from this is that men never really liked whiskers any more than did the women. But down through the centuries, elimination of the beard remained an ordeal, Then along came King C. Gillette in 1895 with the safety razor. Whiskers didn't dis- A. sample goes into an electric furnace to be burned J A in a stream of oxygen. Vapors are analyzed to see appear over night. Men were proud of the that the proper proportion of carbon is present. 58 Modern Mechanix Hobbies &

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RAZOR BLADE wiry toughness of their beards. You couldn't convince them that a little piece of metal stuck into a miniature double-edged hoe, could make shaving a painless, two-minute chore. Even those few with faces too handsome to conceal, who went through the daily face- scraping with much the same martyr-to- looks spirit a woman assumes when getting a permanent, demanded a great steel forging, laboriously hollow ground, and equipped with a fancy handle. It required a lot of stropping and honing to keep a keen edge on that forg- ing they called a razor. Gillette had the revolu- tionary idea that it was only the edge you shaved with, and that the rest didn't really matter. He popularized shav- ing by developing an edge so sharp it is in- visible, yet so cheap you can throw it away after using it once. And the edge of the razor blade actually is Variations in hardness are detected by this black box in the Gillette factory at Boston. If the steel in process above does not match the master strip below in hardness, the electricity going to furnace is varied. Inventions, January, 1937 7 This machine performs one grinding, three hon- y ing and one stropping operation and cuts and stacks the blades on racks. Samples of each coil are d submitted to the dia- mond test for hardness. 1 If it fails in the require- ments, coil ís rejected. d invisible, even when d looked at through the j highest-powered mi- croscope. The cutting edges of 80.000 blades, laid side by side, would occupy only one inch of space. They demonstrate this absolute invisibility at the factory in Boston. They will show you a stack of blades a foot high, clamped to- gether on a special holder. So accurately are the blades cut that the unsharpened ends ap- pear as one solid bar of shining steel. Now turn the stack on edge. You see no shining metal there—only solid black. There is not enough metal on the cutting edges of that stack of blades to reflect a single beam of light. You can photograph it and get nothing on the plate but a solid black rectangle. Place a single blade on its side under a high-power microscope, and there will be no saw-tooth effect—only a straight line. Place the blade 59

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Blades are pictured at left during the sharpening process. grinding wheels, one for each edge, first remove the rough stock. The girl at the right is operating the photoelectric sharpness testing machine. on edge and you wil see nothing. One- eighty-thousandth of an inch is too infinitesi- mal a point in space to be seen by the eye, even when aided by the highest-powered microscope science has produced. To obtain a cutting edge so sharp, close control and microscopically-fine limits of ac- curacy are required for every operation of manufacture. Swedish steel is used because of the high quality of Swedish raw materials and the long experience and great skill in rolling pos- sessed by the Scandinavian mills. To insure uninterrupted production schedules with ac- companying uniformity of quality, a tremen- dous steel inventory, representing an invest- ment of several hundred thousand dollars, is carried in storage. The coils of raw steel arrive from Sweden, each wrapped in heavy crepe. paper, covered with oily waterproof paper, while the surfaces of the steel ribbons are coated with a special rust-proofing compound. Six coils are hermetically sealed in a tin con- tainer, which is protected by a wooden box. Thus protected, the shipping case could be immersed in sea water without damage to the contents. As the cases are opened at the factory, a 60 Two sets of sample is cut from each end and tagged with the number of the coil. Another tag is placed on the coil itself, and follows the steel throughout the factory until the finished blades are packed. Each person who handles that particular coil, whether for manufacture or testing, must initial the tag. When the coil passes from one stage of manufacture to an- other, it is checked in and out of the control room. This intricate system of checking and rechecking makes it possible to detect flaws instantly and trace them to their source. It makes it possible to guarantee that only per- fect blades will be offered for sale. The original samples of the soft cold-rolled steel are submitted to a series of rigid labora- tory tests to see that specifications for width, thickness, and metallurgical characteristics are fulfilled, and only when these tests are completed, and an O. K. placed on the tag, is the coil released for production. . Width and thickness are checked by mi- crometer gauges, and the variations per- mitted are infinitesimally small. A sample is then placed in the oscillograph, an instru- ment that virtually sees through steel. Hidden flaws, strains resulting from improper rolling, incorrect micro-structure, are in- stantly detected. Modern Mechanix Hobbies &

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As a final step in the long process, finished blades are sprayed with a powerful antiseptic solution. They are then wrapped and sealed. Samples of each coil are then sent to the laboratory and mi- crophotographed at 3,000 diam- eters, A trained metallurgist studies these photographs to de- termine if the inner structure, the combination of elements making up the metal, is suitable for blades. Another sample goes into an electric fur- nace, to be burned in a stream of oxygen. Vapors resulting from this combustion are analyzed chemically to see that exactly the right proportion of carbon is present. This chemical content is extremely im- portant. Without the proper amount of car- bon the steel will lack hardness. With too much sulphur or phosphorus, the steel will not yield a cutting edge that will stand up for a number of shaves. With too little manga- nese or chromium, the steel will lack tough- ness. Metal failing to meet these rigid laboratory tests is immediately crated and re- turned to Sweden. If approved in the laboratory, the coil of soft steel is wound on a reel and sent to the perforating machine. But before it reaches the dies it feeds through two series of oil Inventions, January, 1937 wipers, which remove any foreign matter adhering to the strip and add an oil which aids the perforating die and prevents rust be- tween this and the next operation. These dies that punch out the center slot are the acme of accuracy. They must be if the blade is to be held in the razor at the cor- rect position for a proper shave. Unable to obtain such accuracy elsewhere, the factory employs its own corps of die cutters, any one of whom could grind the print off this page without removing a particle of the paper. So critical is the workmanship demanded here that in certain cases it has been neces- sary to release a man from his bench to other. easier tasks for several months to prevent a nervous f [Continued on page 118] Sideburns and full beards were the order of the day, even for young men, before dawn of the safety razor.

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Women Head Winner's List in M. M. Doctors, lawyers, office workers and thousands of home tele- phone subscribers would ap- Pteciate an automatic device that would record the tele- phone numbers of persons who had tried to make con- tact during their absence. OMEN head the list of winners of the 5 MM Needed Inventions Contest this month. Miss Nan Conklin, of 8527 Thirtieth Street, N. W., Seattle, Wash., was awarded first prize of $25 cash for suggesting an auto- PRIZES in Cash in Cash in Cash each each in Cash First Prize Second Prize ... Third Prize Three Fourth Prizes Four Fifth Prizes Total—10 Prizes matic telephone device that would record the telephone numbers of incoming calls in the event the calls go unanswered due to no one being at hand to receive them. Increased satisfaction on the part of tele- phone subscribers would result from the de- velopment of such a device. Upon arriving at home or office, one would immediately know if someone had been trying to make telephone contact, and a glance at the indi- cator board would show the number to be called. Mrs. Ada Gearhard, of 1509 Division Street, Boise, Idaho, won second prize of $10 with a suggestion for a wordometer. The word- ometer, a mechanical typewriter attachment, 62 Inventions Contest A mechanical wordometer de- vice that would indicate the number of words typed would find favor with hordes of students, typists, writers, re- porters, publishers and editors. Ordinary straight clothespins sometimes lose their grip when wind tugs at the heavily laden clothes line. A notched clothespin should overcome this annoyance to housewives. would indicate the number of words typed. Thousands of typists, writers and reporters would welcome the wordometer since it would eliminate the task of counting each word after typing out a page of copy. A suggestion for a simple clothespin, de- signed to prevent working loose while being [Continued on page 125] Modern Mechanix Hobbies &

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Lone Girl Raises 15,000 Chickens In Indoor Cages DOPTING a system invented by Milton H. Arndt, of Tren- ton, N. J., a 19 year-old Long Island girl, Lillian Swenson, is raising and taking care of 15,000 chickens indoors. The chickens never see or need the sunlight for the necessary vitamin “D” is sup- plied in their food. Each chicken has its own wire compartment measuring about one and a half feet square. Com- partments are arranged in bat- teries of 100 chickens each mak- ing it possible to house them in a small area. Running water and individual feed troughs are lo- cated in each compartment. Through the use of the indooz compartment system, using cel- lars, lofts, etc., and feeding the chickens sci- entifically balanced rations, mortality rate has been cut from 40-60% to less than 1%. So successful is this method that a large New York hotel raises its own chickens on the roof. The flavor of the eggs is said to be superior to those of barnyard chickens. House Shaped Like Elephant This elephant-shaped house at Margate City, N. J., has 22 win dows. It consists of over a million pieces of wood, 8560 ribs, 200 kegs of nails, 12,000 square feet of tin, four tons of bolts. HOUSE built in the shape of an elephant is located at Margate City, N. J. Erected in 1882 by James V. Lafferty, the novel home is said to be the only one of its kind. The body is 38 feet long, the circumference, 80 feet. The head is 26 feet long and 48 feet around. Legs are 22 feet long with a diameter of 10 feet. Glass eyes have an 18-inch diameter. Inventions, January, 1937 | Top—Lillian Swenson shows how she cleans the cages in a few minutes by turning a crank that moves floor conveyor belt. Bottom right—Collecting eggs that have rolled against rubber guard. Charts are kept of each chicken. Left—Cage close-up. Locomotive Pulls 100 Cars ITH an over-all length of 110 feet, a new Challenger type locomotive of the Union Pacific Railroad is powerful enough to pull a freight train of 100 loaded cars at a speed of a mile per minute. The locomotive weighs 43215 tons empty. The firebox of the engine is so large, 9x12 feet, that a mechanical coal stoker is needed. Tender carries 22 tons of coal, 19,000 gallons of water. The American Locomotive Co.. of Schenectady, N. Y., built this 110-foot engine for the Union Pacific Railroad. It will haul 100 cars. Drive wheels are 5 ft., 9 inches in diameter. 63

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AMERICA’S NEWEST AERIAL VIEW OF RACEWAY — . BLOWER FOR, ^ PARKING *RADIATOR..— A CAR GOING 100 MILES AN HOUR. . WITHOUT MOVING FORWARD/ =~ CHASSIS DYNAMOMETER TESTING RACING CAR'S HORSEPOWER IGNITION, ETC. — THE “LINDBERGH CORNER" -MOST DANGEROUS CURVE EMERGENCY OFFSHOOT SiZE OF GNE OF THE |] LARGE AMPLIFIERS Hj FOR THE PUBLIC- AODRESS SYSTEM ex j E9 9 MOVIE 4 ES CURVES FORE : 42, ON ALL C CAMERA, 3,80 G SPEED AN 60 STAND LINH HTTLE MORE THAN EEL D OBS RVERS CONCRETE WALLS AT CURVES ay » c E 4 ITALIAN ALFA-ROMEO CARS. WERE ENTERED, EACH CAR USED ABOUT 89.3 GALLONS OF GAS- OOSEVELT RACEWAY, located SERE AND 2 GALLONS at Westbury, L. L, is America's newest and most dangerous auto- mobile race track. So dangerous is the four-mile. track with its twists and turns that Tazio Nuvolari, of Italy, who won the Vanderbilt Cup and $24,000 of the $60,000 prize money at the opening race last Columbus Day, averaged only 65.998 m.p.h. in his Alfa-Romeo [d T racer although he attained speeds of ar E Weng DROUGHT 145-150 m.p.h. on the straightaways. OVER. The average 75-mile race staged at 64 i Modern Mechanix Hobbies &

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AUTO RACE TRACK 3 Ea CHIEF OBSERVERS ME UR PUBLICADDRESS 4 De FROM WHICH ALL PAR p SYSTEM BOOTH d OF THE TRACK ARE VISIO CHIEF TIMER'S BOOTH RADIO ANNOUNCERS BOOTH CONNECTION BY WIRE BETWEEN™ PHOTO -ELECTRIC CELL AND TIMERS BOOTH ch PAZ TESTED BE- (C E FORE RACE: “SPINNING WHILE. CUTTING SPEED WET POSSIBLE COLLISIONS, MADE THE TURNS DANGEROUS. SoRTFARIM TO RETARD CARS = IF THEY HURDLE GUARD RAIL» the track requires over 1,200 twists and turns, compelling even the most daring drivers to slow up. The track features many safeguards to prevent the racing cars from crashing into the stands or spectators as they skid around the numerous turns, Steel guard rails, supported by stout posts buried three feet in the ground, provide the first check. Be- yond the rails is soft dirt, and then, a heavy wire fence that will stop the plunge of any car that hurtles the [Continued on page 125] Inventions, January, 1937 : 65

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AERIAL MEDICAL SERVICE With power from pedaled generators, radio sets are used to summon or receive medical aid. Up to 200 miles, radiophone conversation is used. Over 200 miles, Morse code dots and dashes are sent out by an automatic keyboard when proper key is pressed. This device eliminates necessity for knowing codes. 66 The Australian Aerial Medi- cal Service maintains ambu- lance planes like this for bringing sick or injured col- onists from isolated interior regions to medical centers. Doctor, pilot and wireless op- erator accompany each plane. À traveling official using a portable field wireless set to summon medical aid from Cloncurry, Queensland, over 600 miles away. The masts held by the natives serve as an aerial. Power for sending the message is produced by using the pedal arrangement generator like a bicycle. IRCRAFT and wireless are being used to wipe out the medical dangers of isolation for large numbers of Australia's bush settlers located in the interior. To bring them speedy medical aid or advice, the Australian Aerial Medical Ser- vice utilizes several ambulance type airplanes, hundreds of cheap wireless sets, and four doctors. The wireless sets, operated by responsible per- sons in each small settlement, summon the doc- tors' aid or advice from the nearest coast medical centers when needed. A single doctor flys as much as 20,000 miles in one year, visiting hundreds of patients, and -holding group consultations at settlements. Modern Mechanix Hobbies &

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Television Phone Links Two German Cities ELEVISION - TELEPHONE service having proved success- ful between Berlin and Leipzig, plans are being made to make the service available all over Ger- many. Both persons can see and hear each other. A flicker type image of the other party appears on the panel directly in front of the per- son using the phone, while the sending apparatus, behind the screens on either side, records his movements and image. Work will start shortly on a similar service between New York and Phila- delphia. Ladder Aids Fire Laddie Tired of handling heavy ladders on steep roofs, A. ailey, Tacoma. Washington, firefighter invented this lightweight collapsible climber. The ladder can be extended from 12 to 24 feet, and extension has hooks for clinging to roof ridges. es A in s O ONFRONTED with the problem of han- dling heavy ladders on steep roofs where the work required means of reaching beyond the 12-foot range of the standard ladder, Fire- man A. D. Bailey of Tacoma, Washington, has invented a collapsible ladder which has been acclaimed and adopted by the Fire Depart- ment of his city. The ladder, of stainless steel, is 12 feet high, but pulls out to reach 22 feet. It can be swung from roof ridges. Inventions, January, 1937 While talking to a friend 168 miles away in Leipzig, this Berliner is watching him, too, as his image appears on the screen in front. The television-telephone works both ways. Called Fastest Transport OWERED with two 450 h.p. Pratt & Whit- ney Wasp Juniors, Lockheed's new Model 12, is claimed by her makers in Burbank, Calif., to be the fastest commercial transport in service on the American airways. Built to carry six passengers and two pilots, the new ship is structurally similar to the famous Lockheed Electra, although somewhat slimmer in line, about the nose. and in the fuselage. The ship's maximum speed at sea level is 214 m.p.h., but at an altitude of 5,000 feet, she hums along at 226 m.p.h. Her cruising speed is 213, and the cruising range, with 200 gallons of gas, is 900 miles. According to those who have ridden in the new model, she takes off rapidly, climbs at a phenomenal rate, and handles well at both low and high speeds. Landing, with flaps down serving as air brakes, the ship comes to a Stop with a very short ground run. New twin-engine model transport which her buildets claim is America's fastest commercial plane. Built te carry six pas- sengers aud two pilots, its cruising speed is 213 m. p. h. 67

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i , Sound Tricks of ae NV Illustrated by Walt Disney EA by Earl Theisen Q o Squeaks, squawks, oinks and music—it's another animated car- toon hit, set to musicin a brand new way. Read how the hay baler joins a symphony. USIC and noises in the animated cartoon interpret the action of the story. The GP ; narrative theme of the music and what is called the “sound effects” punctuates and emphasizes the story. By playing on the aural nerves with symbolic. sounds and noises the psychological i reaction of the audience is controlled and The movies have long recognized the dramatic varied according to the dramatic and emo- possibilities of Dumas’ : Three Musketers, It tional needs of the cartoon story. m took Wale Dimer to If Donald Duck falls, for example, it is not id * possibilities of the Three enough for the sound man to hit a drum for Mouseketeers. Here are four “rough sketches” which outline the action. the noise, but an additional sound character- istic must be added to convey a certain kind of fall There are dozens of differ- ent "sound effects" for cartoon character falls which vary according to the story. When a sympathetic attitude is desired, the “fall” sound is hollow and devoid of jarring char- acteristics, while a harsh sound which shocks the aural nerves is created for that effect. The associative value of sounds is widely used for humor, such as a tearing noise which Copies of the “rough sketches” go to the car- toonists and musicians who build up the action and sound effects to the point illustrated. Above the results are being synchro- nized, and at right are some sound effect implements. 68

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Mickey Mouse é " re Mes 6 aem CGNs) Re ACTION: KANGAROO 9'*eme e] socks MICKEY - — (9.9 Go ee MiCKEY LANDS ar Walt Disney tempts a INTO HAYBALER ~ penguin into conversa- HA ONEEN tion with a strip of fish. (See MUSIC SHEET) Once the penguin be- MACHINE gins to talk, his voice is SWELLS UP — recorded for movie car- BALE OF HAY toon use. This bird POE. IN NEXT SCENE MICKEY TEARS WAY OUT OF is heard in the film, Peculiar Penguins. All sorts of tricks are needed to persuade var- ious animals to “talk.” accompanies the falling of a character. For humorous responses the “sound effect” is often caricatured and distorted. An example of this was the tire skidding noise used in “The Tortoise and the Hare” when the fast moving rabbit slid to a stop. Through study and experimentation Walt Disney and his engineers have found that by introducing music or various sounds and noise frequencies into the cartoon, the re- sponse of the audience is varied and con- trolled. By combining noises of certain pitches or tempos the psychological values of the cartoon music is emphasized in keeping with the story requirements. Sound of sixteen cycles is deep toned and may be used for conveying heavy or depress- ing moods, whereas the sound of a higher frequency is what William Garity, Chief En- Inventions, January, 1937 Part of the musician’s score for a "steam roller sym- phony.” Without music, the action would lack life. à WHOLE MAGHI co SWELLS UR = ^» Micky POPS Ouy it BALE OF BAY — n, MACHINE ee The "rough sketch" at left was given to "Pinto" Colvig for See the musical interpre- s tation. Each moving a : A PA ee: FLIES Part was turned into aoi Ges HARP) sound as shown on finished score above. gineer at Walt Disney’s, calls the “pain sen- sitive region.” Noises of this higher pitch make the hearer alert and may be carried to the point of actually causing distress, such as a “file on glass" noise. The average ear is very sensitive to sounds of 2,000 or 3,000 cycles and unless some sound of this pitch is added to the cartoon background noise, the audience is less responsive to the effects. Stories are told by sound. "Pinto" Colvig, who wrote the lyrics for “The Three Little Pigs" and who does many of the sound “imi- tations" for automobiles, airplanes, or ma- chines when they assume human character- istics, is able to convey a whole story by sound. For example, in a recent picture he caricatured a steam roller at work by suitable noises, pops, puffs, razzes, and wheezes. Vocally, without the aid of mechanical de- 69

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Such A last minute conference before re- cording. Disney and his director talk it over with the conductor. i cn In the Monitor room the director, head engineer and Disney listen to the sounds produced on the sound stage. Here sound is reproduced exactly as it will be heard in the theater. vices, he depicted a narrative episode of a very busy steam roller that worked hard, then got tired and stopped. To do this he made a picture on paper of the sound by working out the suitable suggestive sounds and inflections which he set down on music paper according to the desired effects, tonal range, and tempo which brought to life the pen and ink steam shovel. “Pinto” Colvig with the aid of a trombone and vocal sounds can make an airplane do all sorts of antics. Real airplane sounds cannot be con- trolled to musical tempo for cartoon effects. Each sound in a cartoon film is the result cf much thought. Such things as bugs, all 70 x clever bits this would fail flat without a humorous musical accompaniment. which is used for special effects. Fifty or sixty hours of of action as The Silly Symphony orchestra on the special resonator floor rehearsal are required in the production of the average film. sizes, getting the hiccoughs which happened in “Mickey’s Garden” when Mickey sprayed them with “bug eliminator” required hours of rehearsal before the sound was recorded. For some sounds hours are required in re- hearsal, and fifty or sixty hours are required to make the sound for the average cartoon. There are six men and women under con- tract at Disney’s who do nothing but mimic and imitate many sounds. The distorted Donald Duck conversation and singing is done entirely by mouth without mechanical aid, as is that of Madame Clara Cluck, Mickey, and the other characters. Walt, him- self, does the Mickey chatter. Much of the “imitator’s” time is spent in inventing car- toon noises. For cartoon kisses, the "imitator" kisses his own hand or arm. For a Mickey-Minnie embrace, the “imitator” kisses the heel of his hand, while a tiny bug osculation is obtained from his thumb. A moist noisy smack is gained by kissing his arm at the elbow bend. Cartoon embraces are not as emotional as they are humorous because of the caricatured sound. Modern Mechanix Hobbies &

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Each gag used in a Silly Symphony is selected from hundreds of others. The gag department contains thousands of inventions which will never be pat- ented, for they operate only upon film for the amuse- ment of theater patrons. Here are some ideas sub- mitted for The Country Cousin but not used. They will be filed according to description on the card. Here is a Silly Symphony in full swing, from the quartet at left and sound effects men at center to the orchestra at right. The panel at left “mixes” and blends the various sounds. Recently a sound of a cartoon character talking under water was needed. After much experimentation, the sound was made by one of the “imitators” who talked while a com- mon garden hose ran a stream of water into his mouth. While much of the sound is made vocally, mechanical devices and various materials are also used. One kind of slow-burning fire noise is made by crinkling cellophane, while a more crackling fire sound is gained by twisting a bundle of bamboo strips. A train getting under way is obtained by a tin can in which is a handful of gravel. By shaking the can and gravel up and down, the noise of a real railroad train is created. Another “train noise maker” consists of a number of wires held at one end by hand. The other end of the wires is rubbed over a sheet of corrugated tin. Thunder claps of various kinds are obtained by cowhides and sheets of metal, while wind noises are made by rapidly revolving a wheel with wire spokes. Another hollow ghostly wind noise is made by re- volving a wooden drum against taut silk. Rain noises are made in a drum in which are Inventions, January, 1937 Now that music is carrying a big part of the action, the car- toon animator times his action to so many drawings per beat of music. The number varies according to the musical time. stretched piano wires, Particles of glass dropping against the wire when the drum is revolved creates the sound. Lion roars are obtained from a barrel over which is stretched, drumlike, a piece of skin. Into the center of this skin is tied a heavy piece of cat-gut and the sound is made by sliding a rosin coated piece of leather down the cat-gut. Dog barks are made by similar though smaller contraptions. Various dog bark pitches are made by using assorted sizes of tin cans. The dog “language” is produced by the manner in which the rosined leather is slid on the string.: Often ordinary tools such as egg beaters which furnish machinery noise, derby hats which supply thumping or more exactly a “plop in” sound, and so forth are used for suitable noises, 71

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LICK FLOOR IN Cry CLASS CITY HOME HARDSHIPS FOR SKIDDY FLOOR IN HIGH HOME WES OFF AND SLIDES OW Stick. FLOOR = - = FURNISHE § i SKIDS Aw L- r MOUSE s | c c : $ HT Ca INTO THE CEA i R KITCHEN. = GA Sper s eu Rid 4 pees CUT BACK TO HICK, S d VENE » HICK i: = OP SAME TN : x Zi a ae A wax floor set the j gag men off on this series of humorous incidents. The car- zA% 2 5, toonist works up the P et AN Ans fags N Ke "tough sketches” hy PAN Gs LAS ps2 fF 4} and the animators i Re o. ^ Jic A Y Ww Ni The completed film looks proceed to build up cc. »- = Jà sen S cd 2 like this. The sound track action, Meanwhile a ed d as = Ste has been co-ordinated with the orchestra works €N THEN HE SITHER CRAWLS OVER Tb TAE KITCHEN © T the action, and upon that up "falling noises” DK HE CATCHES A DOORWAY DRAPE AND GIVES $ narrow strip depends as much which will musi- (ro HIMSELF A POLL AND SLIDES To THE KirtHEN of the success of the pro- cally describe each ra | duction as upon the pic- fall of the country d PAP tures. These three frames re- cousin. As no two fe. 3 i 2e veal the tremendous amount falls are alike, the ee | } NG n of detail necessary to show music must be Ey OAR Donald Duck accepting changed to match e— : omm a lollypop. Dho sands £ le. more are nee e to com- sach ope ofnimble A E plete the entire production. SPILLS For “squirrel conversation" a cork is this wood. The resonator which gives a rich- twisted in a bottle with a “cartoon technique” in such a way that various meanings are con- veyed. The squirrels may be made to seem excited, in love, or just chatting. The scund stages where the recording is done are constructed of hard surfaced plaster board lined with blanket layers of mineral wool, felt padding, and matting interspersed with air pockets which aid in “damping” ex- traneous sounds. Thick layers of felt pad- ding and carpeting are laid on the floor. There are two stages; one of which is en- tirely scund-proofed, or “damped,” while a second stage is "live" in that it permits echos to reach the microphone, Many devices are specially constructed in order that certain sound frequencies are dampened so the "imitator" has a better con- trol over the pitch and volume of the noise. Special resonators in the pianos, doors set in elaborate resonating jams so “door-closing” noises may be made for cartoon purposes, and many other constructions are necessary. Even the Silly Symphony orchestra is set in a special resonator made of maple wood because of a required resonating quality of 72 ness to the tone is built in the form of a large tapering loud speaker on one of the sound stages. It is suspended in a floating arrange- ment so as to eliminate echo vibration. Walt Disney, who knows the dramatic value of various sounds and musical tempos, has con- structed many novel devices in order to pro- duce the necessary sounds. The background orchestral music is valu- able in directing the emotional responses of the audience, and is used to elaborate on the cartoon story by what Walt Disney prefers to call the “earical illusion.” The psychological reactions of the theatre audience to sugges- tive noise, musical tempo and tune are care- fully considered in composing musical scores for the animated cartoon. The emotional effect is gained not so much by the music itself as by the manner in which it is played and the noise effects instilled into the orchestration. In connection with the villain, for example, an annoying “out of step" sound is cleverly interwoven into the back- ground music melody is “timed” into the musical effects. [Continued on page 122] Modern Mechanix Hobbies &

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Electrical Stethoscope Helps Doctors Diagnose Through the use of this electrical stethoscope, developed by Western Electric Company, physicians can hear heart mur- murs formerly impossible to detect with ordinary stethoscope. Device May Stop Crashes ESIGNED to eliminate railroad grade crossing accidents, a safety device de- veloped by Alfred Huguet, of Barcelona, Spain, is said to have proved its practicability in a test using model trains. An electric eye switch in the locomotive causes the power to shut off if the train approaches within a cer- tain distance of a crossing at which the guard gate has failed to lower. Ls x ban Left—Alfred Huguet, Spanish inventor, has developed a safety de- vice that may eliminate railroad grade crossing accidents. It can be applied to either steam or electric powered lo- comotives. Above— Model train used to demonstrate Huguet's device. When train ap- proaches a crossing at which gate has failed to lower, a switch lo- cated in the engine cab automatically turns off power and applies the brakes to train wheels. Inventions, January, 1937 N ELECTRICAL stethoscope that enables physicians to greatly amplify heart sounds in making a diagnosis has been de- vised. It features a filter circuit that isolates and accentuates murmur sounds so signifi- cant and yet so difficult to detect with an ordinary acoustical stethoscope. The electrical stethoscope, developed by the Western Electric Company, is in reality an amplifier with a special microphone which is applied to the patient’s body over the heart. The faint impulses picked up by the micro- phone are fed into the small, but powerful, amplifier and are magnified to desired degree. The output of the amplifier passes into a receiver arranged for attachment to the ear- piece of the conventional type of stethoscope which the examining physician applies to his ears in the usual manner. Doctors claim they can now hear internal murmurs that were formerly difficult or impossible to detect. Boat Devised From Scraps A De eae Se cas ae ui Two beach-combers at Fort Bragg, Calif., will brave the oceans in this queer looking boat. They hope to sail it to Burope. Made of scraps from city dumps, it required ten years to build. ONSTRUCTED entirely of scrap materials obtained at city dumps, an odd looking boat awaits launching at Fort Bragg, Calif. It was constructed by two beach- combers who hope to sail to Europe in it. The 25-foot craft required ten years to build and weighs over four tons. More than 15,000 rivets hold it together. A lookout platform atop the cabin is equipped with an old auto- mobile headlight which will serve as a search- light in an emergency. Boat is now standing on railroad wheels on an improvised track awaiting a calm sea before the beach-combers attempt the start of their hazardous trip. 73

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The skill and grace of star ice skating performers is graphi- cally shown in this series of action photographs taken by George Ryan, Minneapolis (Minn.) Tribune cameraman. The photos, taken by a super-speed camera, show Norris 74 Modern Mechanix Hobbies &

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and Naome Wold spin” at Lake Of The Isles in Minneapolis. calls for a degree of skill and precision second to that of oing through the evolutions of the “puck Fancy skating few other activities. Speed, balance, strength, endurance— Inventions, January, 1937 all are required of those who would. perform on the flashing blades. A slip here, a moment’s hesitation there, and what started as a graceful exhibition is turned into an awkward, stumbling display. Constant, painstaking practice is necessary. 75

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ES C is - | Sportsmens TACKLE For Salt NLESS you are familiar with sea fishing the selection of the proper tackle is open to conjecture. There are so many sea fish, all of which fall into many and various divisions such as large, medium and small, some mad tearing and others just a little bit better than very active. All of these species have to be taken into consideration when selecting sea- fishing tackle. Needless to state the techie to be used for sea fishing must be picked according to the size of the fish one is after. Obviously the very large fish, such as the marlin swordfish, the sailfish, the tarpon and the tuna (all racy fish of tackle-testing proportions and ac- tivity) demands the stoutest and most en- during tackle. For such fish a double enamel tip of 60 inches and a weight of approximately 14 to 16 ounces is a suggestion. The butt length will be 20 inches, or the rod, with butt in place, measuring 6 feet. 8 inches over all. With a rod of the sort a 9-0 reel or heavier is a suggestion. A 36 to 38-thread cutty- hunk line is often used although lighter lines are selected by those practiced in the use of medium weight tackle. Medium weight tackle is used in the taking Circle—Hooking a tarpon is synonymous to roping a wild mustang. When the strike occurs, the great fish leaps high out of the - sea in efforts to shake off the hook, then the fight is on. ^ Below—A sextette of big ones soon to become swordfish fillet In Southern California waters, where these pictures were taken, monster, man-eating sharks often bite chunks from the fish before it can be hauled aboard the boat. artes

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Campfire - Water FISHING ^ b Yy Robert Page Lincoln of such fish as the barracuda, the amber- jack, the great kingfish, California yellow- tail, crevalle and others. The rods for this purpose should range from 10 to 14 ounces, with a 6-0 reel to keep it company. A 24 to 30-thread cuttyhunk line is a practical sug- gestion. A double enamel rod is not needed for this department, the single enamel rod being suitable and not too light. A tip in this class weighing 9 ounces has a length of 60 inches. A lighter rod, one ranging 7 to 10 ounces in weight will take a 4-0 reel, with a cutty- hunk linen line of from 15 to 21 threads. A rod of the sort will handle with ease all fish less in weight than the species listed in the second class. Incidentally, let it be men- tioned that in this third class of sea fish, in which will be found the mangrove snappers, the Spanish mackerel, the bluefish, the sea trout, the channel bass, the smaller croakers, the robalo, the sheepshead, and others, the common, everyday bait rod and black bass fishing tackle such as is used in inland fishing is now much in vogue. In fact, there is an ever-increasing disposition on the part of anglers to invade even the ranks of the class Whe-e-e-e-e-e! sings the reel in the song of the strike. Out behind the boat is a war- rior in a writh- ing, silvery dance—a cyclone on a ‘leash! Sia Sometimes a young hammerhead shark gobbles up the bait, as shown above. To cut the hook from the mouth of this detestable fish often results in a skinned arm or hand, for sharks have sandpaper skin. Below-—A proud man poses with .a 200-pound marlin swordfish which he caught in the Gulf of Mexico.

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two fish with this comparatively light tackle. The bait rod of the bass type is now some- thing of an institution on all coasts, Pacific and Atlantic and in the Gulf of Mexico. In class three will be found fish ranging from five to fifteen pounds in weight. Mention of the everyday black bass bait casting rods as used in sea fishing, in the inlets, bays, and in the river mouths along the coasts, should bring out the fact that while the typical bamboo rods may be used, these 'should be in the double enamel class which gives them considerable strength. The seam- less tubular steel rods are especially suitable to salt water fishing in that no salt moisture

In a single day, between dawn and dusk, this trio sailed back to camp with 4 sailfish and 4 marlin, all ra caught in deep water off 7 San Pedro Island, California. = can get inside of the same to rust the interior and so making for a broken rod. A regulation bait casting reel holding 100 yards of hard braided silk line is used in this salt water fishing, ranging 18-pound to 25- pound test. Owing to the fact that the saline influence of the sea has its effect on the silk the result is that, regardless of its merits, it will deteriorate. The usual method is to wash the line in fresh water after coming in from a trip on the briny deep. A few years ago there were but few of our typical black bass plug lures being used in salt water fishing. Now they are sold by the thousands in every salt water fishing location, especially around the Florida coasts and in the Gulf of Mexico from Naples, Florida to Brownsville, Texas. While various under- water lures have their champions in salt water fishing as it is practiced with our inland, fresh water bait casting rods and regulation black bass tackle, still the type of lure that is mostly in demand are the various surface lures, the variety that can be “popped” on the © surface. A lure of the sort floats when not in action. By reason of a raised collar, a scoop in the wood at the head, double-jointed effect, or some other means which will agitate the water, it is used to wonderful effect. The lure is cast and then, as it is reeled in, it is [Continued on page 120] One of the most vicious and dangerous sea fighters is the Manta Reya, often called the blanket fish, which in- ‘habits the waters off the Coast of Mexico. The mon- ster shown below measures . 24 feet actoss and is 8 feet thick. He is caught from a large boat, but ís often ac- cidentally hooked by dory fishermen. But wise to the -— ways of this vicious fish, * < they cut the line and row out of the vicinity. ese fish swamp small boats.

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IODINE VAPOR DETECTS FINGERPRINTS CIENCE again has played an important part in the war on crime with the inven- tion of the iodine vapor fingerprint detector by two Pasadena, California, men. Working with the assistance of Lieut. R. S. Sears, of the Pasadena Police Department, Dr. John McMorris, a chemist, has perfected a device which reveals fingerprints simply by blowing on them. The instrument consists of a glass thistle tube containing calcium chloride. When the breath is blown through the rubber hose it is heated by the calcium chloride which then absorbs the iodine fumes in another portion of the tube and projects them on the finger- print surface. The vapor detector has gained the attention of police officials everywhere. Huge Pineapple Water Tank Built in the shape of a giant pineapple the water tank, shown here, serves as an unusual advertise- ment medium for a Ha- waiian cannery located at Honolulu, T. H. The pineapple shaped tank measures twenty-four feet in diameter and weighs thirty-six tons. Supported on a8 high steel tower the pineapple is visible from all parts of the city and commands the attention of all persons who visit in Honolulu. News of Hawaii Photo. | ASHIONED after a huge pineapple, a water tank on the roof of a large Hawaiian cannery is the cause of much com- ment by visitors to Honolulu. Visible from all parts of the city the pineapple looks as natural as the actual fruit. Supported on a tall steel tower the tank measures twenty- four feet in diameter and sixty feet high. When the breath is blown through this apparatus iodine fumes are given off and fingerprints immediately show up. Dr. Jobn McMorris is shown demonstrating the device to an assistant. Cars Use Trackless Bridge FTER designing and building of the famous harbor bridge at Sidney, Aus- tralia, had been completed engineers realized that they had overlooked the installation of street car rails. As a result one of the city's important lines was severed and to lay tracks over the completed bridge would have been next to the impossible. An English engi- neering firm in Liverpool was called on to solve the problem and as a result service has been restored through the use of motorized "trolley trailers." Having constructed a bridge without street car tracks and then finding Street car service was es- sential, Australian tram officials had a British en- gineering firm construct this “trolley trailer.” Street cars run up on the trailer under their own power, are transported actoss bridge and con- tinue their way via rail. 79

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Vibrator-Tamping Machines Develop Great Power ep ignoret with a 100-horsepower Diesel engine, as machine tamps down new asphalt and concrete roads with a tamping pressure of 60,000 pounds. Bottom— This hand operated tamper exerts 600 pounds pressure. Converter Aids Lathe Work MASTER lathe converter device that makes it possible, when used in con- junction with an engine lathe, to do practi- cally every conceivable operation of milling, grinding, and broaching has been invented by a North Kansas City, Mo., manu- facturer. A feature of the new device is that it is not necessary to dis- mantle the lathe in order to at- tach it. This master lathe converter, when used on an engine lathe, enables the operator to use the lathe as a milling, grinding, or broaching machine. It is easily attached. 80 ESIGNED to produce a maximum of power with a minimum of weight, two new types of vibrator-tamping ma- chines have been developed in Germany. They are used for tamping down newly made as- phalt or concrete roads and other similar construction work. The smaller of the two new machines is powered with a small electric motor and is cap- able of exerting a tamping force of 600 pounds. An electric cable running through the handle of the machine connects the motor with a portable power unit. The larger machine, mounted on a tractor, is powered with a Diesel motor of 100-horsepower. It exerts a tamping force of over 60,000 pounds. Creates Barnacle Novelties Michael Kelly, Alaskan sailor. has found many uses for the lowly barnacle. He covers them with lacquer, molds a base of cement and plaster, and creates flower vases, ash trays, etc. LOWER vases, ash trays, match holders, and many other novel objects have been created from barnacles by Michael Kelly, an Alaskan sailor. The barnacles, ranging in size from 1 to 15 inches, are treated with lacquer to give them a finish. Quick setting cement makes a base for the finished objects. Modern Mechanix Hobbies &

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WORKSHOP FAN BUILDS OWN HOME Above—This charm- ing stu cc o-covered home of Swedish de- sign was constructed by one man at Fox Lake, Wisconsin. A pent house tops the combined workshop and garage. Left— Hugh I. Kirsh, vice- president of the Western Malleable Co., built the home in his spare time. The complete work- shop located in the garage from which Mr. Kirsh turned out interior furnishings for his home. The beauty of the finished home proves value of a well-equipped ^3| home workshop for A the tool-handy man. Handmade twin poster beds with beaded decorations are a feature of Mr. Kirsh's home. Knotty pine walls add beauty. UGH I. KIRSH, of Fox Lake, Wisconsin, built and furnished his own home. Of Swedish design, the home is distinguished by attractive hammered iron work and novel woodworking furnishings. A drooping shingled roof and a gray stone chimney serve to give the home an aspect that fits in well The dining alcove of Mr. Kirsh’s unique home. Scrolled i 7 window frames, open shelves and handtiled decorations be- with the surrounding landscaped setting. neath the leaded windows create an effect of simple beauty. Inventions, January, 1937 81

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Look right and down into the age- old ice and know why Father Hub- bard is called the "'Glacier Priest." He took this picture from his per- ilous perch across the great crevice. by James N. Miller LYING into the craters of volcanoes, skimming dangerously over the ice caps of the North, and exploring the mummy of a ghost world in the *Valley of Ten Thousand Smokes," have provided thrills galore for Father Bernard R. Hubbard, S. J., inter- nationally known as the “Glacier Priest.” Now, after his tenth trip to the roof of the world last summer, when he brought back a remarkable balance sheet of hard luck and achievement, the famed explorer plans to turn from the study of geology—the science - of rocks—-to the study of primitive human beings. For, while pondering the mysteries of the birth of storms that influence the four seasons of the year in the United States for better or for worse, Father Hubbard believes he has also fathomed the origin of man in America, who came to this continent on a newly dis- covered ancient road from Asia. Father Hubbard believes that his last trip, the tenth in a successive series, was the most important of all. He found that the Taku ice-cap, near Juneau, one of the southern- most formations of its kind, is receding and exposing a fossil glacier of the last Ice Age. Nearby, he said, the Taku glacier was half aground and will soon cease breaking off ice- bergs, and Twin glacier has receded a mile and is wholly aground. This means the tre- mendous flow of icebergs that consitutes an ever-present menace to shipping hundreds of miles to the south, soon will be a hazard of the past. 82 Nast Does this rock writing mark the road by which ancient man first came into America from Asia? Father Hubbard (above) believes so, claiming many came in over this chain of Aleutian Islands, although the main route was by the Bering Ses. Viewing the immense Taku ice-cap last summer for the first time in ten years, ihe Glacier Priest reported: “The vast ice mass is shrinking, which proves that the earth is still in a recessional ice age. On Taku ice-cap many new moun- tains, called Nuntakas, as well as long, rocky ridges have appeared where I saw only Modern Mechanix Hobbies &

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Soaring over craters, jumping bottomless pits edged with rotten ice, frozen by gales, feet fry- `" ing in volcanic heat— these are experiences of Father B. Hubbard. Magook, Father Hubbard and Wolfe— the three pals who fought the dangers of six Alaskan expeditions together. And last summer, when a mother huskie gave birth to seven woolly pups, Magook and Wolfe toted the babies in addition to their 50 1b. packs Off Bogsolof, Father Hubbard attempted to make a 4-ton sea Íion into a movie actor, but was rebuked with angry barks and a lumbering chase that threatened to crush the nearby cameras and scientific apparatus. full-grown sea lion is no man's friend. m RR sé Lond d crevassed ice ten years ago, Taku glacier and the lobes of Twin glacier have retreated. The Mendenhall glacier has been melting back and is exposing a fossil glacier under- neath the present one. The hundreds of square miles of this ice-cap and its many glacier tongues are a new layer of ice hun- dreds of feet thick lying on top of a remnant of the last ice age, which is a fossil body of ice entirely different in crystal form. It ap- pears here and there as the upper layer melts.” Father Hubbard and his party found land- locked icebergs in Twin glacier lake, the bottom of which is 600 feet below sea level. The icebergs float there the year round, and Inventions, January, 1937 keep the water near freezing temperatures. Nicholas Cavalierre, of New Haven, Conn., a member of the Hubbard party, took 50,000 feet of motion pictures of the Taku region. The year before, on the ninth expedition, the party also took 30,000 feet of film of action “shots” of glaciers of a spectacular type never before filmed—showing enormous mountains of ice tearing away from the glacier mother to strike the sea below with a terrific roar and splash. These “shots” were made on the final 60-mile lap of exploration of the entire 600 miles of the Alaskan Peninsula and adjacent islands, and were taken from a small steamer anchored alongside Hubbard glacier in Dis- enchantment bay, southeastern Alaska. [Continued on page 128]

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HARBOR TUGS TELEPHONE SHORE This harbor telephone system can be in- stalled in a closet or under a bunk. It consists of transmitter, receiver and generator plant. H 4 New England fisher- men were the first to benefit from the radio-marine tele- phone. This fisher- man is making a call on the older speaker monitor phone. Capt. Ole Whalen, shown below, calls his office on the new selective signaling equipment. D Por 73 Prali When the Gerirude M. Fauci, shown here, sprung a leak in the height of a wintry gale Capt. Patrick McHugh sent his men to the pumps and put through a rescue phone call, ud NTRODUCED a little more than a year ago as a means of keeping New England fishing vessels in contact with their ports the radio-marine telephone is now an im- portant part of New York's harbor commu- nications system. Until recently tug boats working in the harbor had to watch for wig- wag signals from the shore or else put in to shore and call their office by telephone for further orders. Due to its success in the New England area a radio-marine telephone system was decided upon for New York harbor traffic. A special a exchange has been installed to handle all calls T gc . from craft in the nearby waters. A short- es : wave transmitter sends phone messages out to special receiving apparatus on the tugs. 84 Modern Mechanix Hobbies & From this trans- mitter located in a New York tele- phone exchange all calls for tugs in the harbor pass. In- corporated into the unit is a receiver for picking up the calls which are sent out by the tugs. hs TAGIN,

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Bureau Of Mines Opens First Hydrogenation Plant OOKING ahead to the day in the future when the oil supply of the nation may be depleted, the U. S. Bureau of Mines has opened the first hydro- genation plant in America at Pittsburgh, Pa. In the heart of the coal and oil district, the plant will be used to conduct experi- ments for making oil from coal. It is estimated that the coal supply of the U. S., unlike the de- cidedly limited oil supply, will last for 150 years or more. Coal hydrogenation consists of adding hydrogen to coal and turning the coal into petroleum from which is obtained the by- products—gasoline, kerosene, etc. The pro- cess was invented by Dr. Friedrich Bergius, German Nobel Prize winner in chemistry. Dr. A. C. Fieldner, chief of the Bureau of Mines technologie division, and Dr. H. H. Storch, physical chemist of the bureau, will direct the plant's activities. Explorers Use Amphibian Standing on the bow of her amphibian plane, Mrs. Martin Johnson, famous explorer, invited these Borneo natives to fly. Awed at first, they soon enjoyed the sensation of flight. IDED by an amphibian plane based at their jungle camp on the Kinabatangan River in Borneo, Mr. and Mrs. Martin John- son, noted explorers, are making sound pic- tures of wild life for the American Museum of Natural History. The plane, used by the Johnsons on their African expedition, too, is named "The Spirit of Africa and Borneo." Inventions, January, 1937 Top—First American hydrogenation plant erected at Pitts- burgh, Pa., will enable U. S. Bureau of Mines to derive oil from coal. Lower Left—Plant apparatus. Lower Right—Dr. Friedrich Burgius, German chemist who invented the process. Dry Battery Provides Power TANDING 6 feet high, the largest dry bat- tery in the world is installed in a flashing inland waterway beacon at St. Louis, Mo. Man- ufactured by the Ray-Vac Elec- tric Co., Madi- son, Wis., its 70 cells will provide 615-volt power for one year. This 70-cell dry battery, 6 feet high, supplies power for one year. 85

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BETHLEHEM Opens New Hn HA a ae From the roughing rolls shown at left, that receive the thick, hot slab of steel, the metal moves in a continuous ribbon, emerging as finished strip from rollers, above. Me 3 Jets of water, at 1,000 pounds pressure, play on hot steel as it enters the rolls to knock off ^. the oxides, or “mill scale." by Watson Davis AN and machine reach new heights of co-ordination in a new $20,000,000 steel strip mill of the Beth- lehem Steel Co., at Lackawanna, N. Y., near Buffalo. Human brains and skill, both in design and operation, combine with precise and delicate control of large electrical power to roll a thick slab into a lengthy strip of sheet metal in a few minutes. To see a red-hot chunk of steel pass successively through eleven huge sets [Continued on page 128] 86 Modern Mechanix Hobbies & White hot slab emerging from furnace to start the ` feng roll into a thin strip.

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$20,000,000 MILL Rolled strip sheet emerging from a tandem of cold mills which give it high finished surface. Below—Strips coming out of the pickling bath before entering the cold mill process. The finished product ready for cold-forming into auto bodies and hundred-and-one other products. It is shipped in flat sheets, as at left, and in coils weighing tons each. Inventions, January, 1937 i = 87

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Floating Aerodromes RM t ‘ ae With improved air service between South America an South Africa it was found necessary to construct this second floating aerodrome, the “Ostmark,” Planes are catapulted from deck. Grandfather Wins Air Race N AIR meet recently staged at Bradford, Pa., featured only flyers who were grandfathers. The race, which was over a 25-mile course, was won by 62-year-old Paul Lyon who narrowly scored over Harold Sher- rick, a youngster of 49; the grandfather of six children. The air meet was sponsored by the recently organized “Flying Grandfathers Association” with headquarters at Bradford. Among the entries was 71-year-old George Metzger of Emporium, Pa., who handled his plane like a youthful pilot. Winner of what is believed to be the first grandfathers’ air race is Paul Lyon, who is shown here with his wife, daughter and grandson. Race was staged over a twenty-five-mile course. 88 Speed Trans-Ocean Flights ITH the construction of a new fleet of planes for the South Africa-South America service, at the Dornier Works in Germany, the service has been improved to such an extent that a new sea aerodrome has been placed in service near the South American coast. Christened the “Ostmark,” the craft is equipped with complete radio ap- paratus for sending weather reports to the planes in flight. In landing the express planes light on the water and are lifted to the “Ost- mark’s” deck by a huge crane. After being refueled the planes are placed on a hydraulic catapult and “shot” into flight to continue on their way. Three aerodromes are employed for this ocean air service since one ship must always be undergoing dry dock repairs. Russia Builds Phone Booths Telephone pay stations aren’t difficult to locate in Russia. Giant hand sets like this one have been erected on the roofs of phone booths to popularize service. Phones are of sheet metal. N ORDER to popularize telephone service in that country the Russian government has placed public telephone booths on the streets of all large cities. In order that they would attract the public’s eye, large hand phones were made from sheet metal and erected on the roofs of the pay stations. Modern Mechanix Hobbies &

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SPARKS and = 3. ELECTRICAL EXPERIMENTS Spool Is Automatic Switch SWITCH that will automatically turn on the lights in a closet when the door is opened can be made from a cotton thread spool and a few other parts which are certain to be found about the home. Mount the spool on a block of wood. To one end of the spool cement a large brass washer and connect it to a terminal post with a length of wire. Secure a wooden dowel rod just large enough to slide inside the spool and force a slightly smaller brass washer over one end. Solder a length of flexible wire to this washer and con- nect it to the remaining binding post. Drill a hole in the opposite end of the wooden dowel so that the end of a wire spring may be in- serted and locked in place. Insert switch in light circuit. Chart Identifies Resistors 3172" AT ARC oe Cut from three pieces of cardboard this handy chart identifies the resistance of carbon color coded resistors as used in radio and electrical experiments. Paint divisions in colors indicated. CHART for identifying color coded re- sistors can be used for many experimen- tal purposes in the workshop. Cut three cardboard angles to the sizes given and num- ber each one from one to nine. Paint each numbered space in the color indicated and then assemble in fan-like fashion with either an eyelet or dress fastener. To use, arrange colors on chart to correspond with those on resistance. Numbers on colored spaces indi- cate ohms. Inventions, January, 1937 it is no longer necessary to fumble in the «M y WIRING DIAGRAM With this automatic closet switch installed just inside the door dark for switches. Spool, brass washers, spring and wood dowel comprise parts. Polish Bottle Is Handy Torch N WORKING outdoors or in other places where a soldering iron is not available a simple torch for soldering can be used effec- tively. The torch is simplicity itself and con- sists of an empty shoe dressing bottle which has been partly filled with denatured alcohol. The applicator is saturated in the fluid and a match applied to it, The torch will produce a hot flame which will prove suffi- cient for all kinds of light soldering work. When using a torch of this type it is a wise idea to use a solder which is prepared in a paste form and applied to joint to be soldered. [ LL Y "7 E i \ IGNITE - ae QN APPLi- CATOR FOR An empty shoe dressing bottle partly filled with denatured al. cohol makes a practical torch for soldering splices in house wiring. 89

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TINY AMPLIFIER FEATURES This compact metal tube amplifier provides both B power and speaker volume for small sets. VERY radio experimenter has occasion at some time to use an amplifier; es- pecially if he owns a small two or three-tube Short wave receiver. Until a few years ago. any amplifier that had the least bit of output was a bulky affair weighing at least 25 pounds. With the improvements in radio design which have been made during the last few years it is now possible to construct a powerful little amplifier in a tiny metal chassis .scarcely Provided with a tone measuring 7 by.4!2 by 2 inches. Small as it shortwave receivers may be it is nevertheless capable of deliver- mi compet AER "a ing nearly 3 watts of undistorted power am- output of three watts. plification. H DYNAMIC SPEAKER 250,000 OHMS NOTE: MAKE TUBE SOCKET CONNECTIONS ONLY TO PRONGS INDICATED ~—LEAVE OTHERS BLANK SS zw xf f / The radio builder should experi- ence no construction difficulties if he follows this wiring diagram carefully. All parts are shown in their relative positions in set. 90 Modern Mechanix Hobbies &

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METAL TUBES by Wm. J. Vette Suitable for all experi- mental needs this compact metal amplifier has an out- put of approximately three watts of undistorted power. 500,000 OHMS i DIAGRAM SHOWS BOTTOM VIEW OF SOCKETS 250,000 SPEAKER SOCKET OHMS * SWITCH ON TONE CONTROL x ipe MO v. A.C POWER E MER = If this schematic wiring diagram is followed along with the pictorial hook-up there is little chance for errors to occur. in the circuit since some are blank. they appear from the bottom of The construction is begun by forming the ` chassis from a sheet of alloy metal or aluminum. Of course, sheet iron may be used but it is more difficult to "handle. After punching out the holes for the tube sockets, assemble the sockets and proceed to wire up the various parts. Work can be simplified if the pictorial and schematic diagrams are carefully studied before any actual construc- tion is started. Examination of the circuit will reveal the use of three metal type tubes. A type 6F5 tube is used in the input, a type 6F6 in the output and a type 5Z4 rectifier tube in the power supply circuit. By wiring up these Inventions, January, 1937 Note that the tube prongs are not all connected Tube sockets, above, socket; show the connections as shows top view. pictorial diagram tubes according to the numbers appearing on the prongs in both the pictorial and schematic diagrams no difficulties will be encountered. In order to operate the amplifier at its peak efficiency a novel code tone control is em- ployed. One potentiometer serves as code tone control while the other is used to regu- late volume. The volume control is fitted with an A. C. switch so that one control turns on the power and regulates the volume of the receiver as well. A unique feature of this Biden is the self-contained B and filament power supply for supplying current to a small short wave [Continued on page 132] 91

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NEW IDEAS FoR THE RADIO FAN PHONOGRAPH RECORDS SPACER FOR CAGED | TwsTéD LEAD IN AERIALS A novel form of DX short wave receiver antenna can be made by using a pair of old phonograph records for spacer insulators. Drill four small holes in each disc just large enough to pass No. 14 antenna wire and wire up the antenna according to the diagram shown above, For the lead-in wire use twisted fixture cord. Connect the antenna to the receiver through a coupling coil—Morris Katz, Aurora. Ill, CLOSED CIRCUIT JACK REMOVE LA GRID CAP ATTACH 25 FT. ANTENNA TO JST DETECTOR TUBE HEAVY LINES . SHOW LEADS ADDED a BÉ DYNAMIC SAME CIRCUIT USING SWITCH i SPEAKER INSTEAD OF JACK RESISTOR SPEAKER DISCONNECTER FOR PHONES Modern all-wave receivers which are not furnished with an earphone Connecting the antenna directly to the grid cap of the first jack can he quickly provided with this valuable attachment by con- EMEN tube or vour Pica se IR e b. necting a closed circuit Jack in the output of the recelver in the in eate from ud ELEM or IRURE IKE manner described in the diagram pictured above. A 5-ohm, 10-watt id cli im 25 d t aio AAW Teenie ERE TE resistance shunted across the voice coil of the speaker cuts it out ] GR PEG S CUBES te bab UE CER od, Pa. when the earphones are used.—-L, J. Markus, Washington, D. C. i CURRENTLESS VOLTMETER 50,000 OR 100,000 OHM pee EO TENTIOMETER 45 VOLT B BATTERY O-—! MA, D.C. MILLIAMMETER TO VOLTAGE BEING MEASURED TEST ROBES Ahove—The transformer from a Ford T spark coil unit makes a good experimental micro- Phone coupting transformer. The method of connecting a telephone transformer to an amplifier is described in the illustration. Right—This test assembly is a handy addition to the experimenter's workbench and solves a perplexing problem. Since many volt meters have an internal resistance which prevents accurate voltage measurements they are of little i. y 7 A value for ordinary use. This circuit provides accurate readings.—L. J. Markus. ? A 92 Modern Mechanix Hobbies &

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Decorate Woods With Japanese "Sugi" Finish BOARD IS PLACED ON STOVE - GAS, KEROSENE OR. GASOLINE — Al THE SURFACE ANRT EAA "RED UNIS CHARRED PANEL. VIGOROUSLY BRUSHED WITH STIFF WIRE BRUSH Home workshop projects can be attractively finished with a Japanese "Sugi" effect by charring the surface of the wood over a stove then scraping off charred portion with wire brush. Gun Catapults Toy Planes HOOTING miniature glider planes into the air with a sling-shot pistol is great fun especially if a dozen planes are constructed and fired into the air in rapid succession. The planes are simple to construct since they con- sist of just four pieces of balsa wood, the rud- der, the stick, wing and elevator. The wing structure is 7g-inch balsa as are rudder and elevator. The stick is cut from a one-foot length of #3; by 34-inch and notched at one end to allow for the insertion of the rudder. The wings are fastened to the stick with rub- ber bands, Adjust the wing position until the glider sails in an even flight. The pistol is cut from a piece of white pine or similar stock and slotted at one end to take a rubber band for catapulting the glider. A groove in the top of the gun permits the stick to slide freely in it. To shoot the planes place the stick in the groove, hook the rubber band over the rudder end of the stick and pull back. Inventions, January, 1937 EAUTIFUL cabinets, panels and other articles with a finish similar to that of aged driftwood can be produced in the home workshop by anyone the least bit handy with tools. The finish which the Japanese have made famous as “Sugi” is best produced on a medium hard wood such as cyprus although white pine and similar woods can be used. To produce the “Sugi” finish place the wood over a flame for about five minutes, or long enough for its surface to turn black. Remove the wood from the flame and briskly rub a wire brush over the charred surface following the direction of the grain. Brush away the burned wood until a chocolate color results then apply a coat of clear varnish to this sur- face. The varnish will bring out the grain revealing a beautiful surface equal to the Japanese finish, itself. ‘ Many attractive home decorations can be made from wood which has first been pre- pared in the manner described above. On hard ‘woods it may be necessary to burn the surface several times after the initial scrap- ing until the correct color and grain effect is obtained. RUBBER BAND — —— ^ sLoT | SLO I Lo Ñ H PINE OR BASSWOOD EVATOR TRAC g LAUNCHING GUN zap I2 LONG E QR BASSWOOD DXX 2 WINDBAND . TIGHTLY.OVER STICK : CUT SLOT IN STICK FOR RUDDER Balsa glider planes like the one shown here loop and zoom through the air for several minutes. A sling-shot pistol, carved from soft wood, launches planes. Rubber bands hold wings. 93

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EXTEND HOLIDAY GREETINGS HEAVY WALL - : BOARD 4! THICK TURNS ON ALL LIGHTS OPENING IS COVERED WITH THEATRICAL SCRIM AND BACKED WITH CARDBOARD. LETTERS ARE CUT IN CARDBOARD , PLASTER OF PARIS MOLDED AVE ( OVER NAILS d Pee M „TABS V4 THICK This sparkling greeting archway blinks like a theater sign. The roller contact switch shown here operates lights. Plaster and water glass are used for snow. TABS ON DRUM LIGHT EACH LAMP SEPARATELY CLEATS TURN ON jj É Aee ons AT 1 j FLASHER à ? UNIT The flash is shown at left. Roller revolving over con- | tacts causes lights to blink. by David A. Brown " l4, QUARTER-ROUND TN THE creation of novel Christmas deco- rations for the home, amateur craftsmen will encounter many interesting tests of skill and ingenuity. Carpentry, electricity and metal working all play a part in the adapting of the traditional symbols of the season to modern ideas of design and utility, and the workshop enthusiast who directs his atten- tions toward such a seasonable project is certain to enjoy many hours of entertaining o | work; his home will reflect the spirit of the "WALLBOARD K ; 1 occasion; and he will have the satisfaction of oN agi knowing that he has done much to preserve the beautiful customs long associated with this ancient holiday. f wo» By combining light and shadow with mo- R tion, an unusual house top decoration may be VERSES S REMOVE. BELL contrived from the time honored Santa and CHRISTMAS [THREADS reindeers. Cover the accompanying illustra- TREE y j tion with a sheet of tracing paper ruled into 1$" squares and, with the intersecting lines 1 s tree. as guides, transfer the figures to a 4'x6' piece Sitchin ae of wall board which has been marked off into 94: Modern Mechanix Hobbies & The frame of this novel SLEIGH Christmas tree is of wood, BELLS

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z REINDEER PIVOTED ON o. BOLT RUN THROUGH WITH OUTDOOR DECORATIONS WALLBOARD = SP A | : : ; 2 ow v f WIRE WIRE TWISTED - 07 N OVER. BOLT SANTA AND SLEIGH REMAIN | NY STATIONARY Je : à 50 watt D SURPLUS WIRE CAN A LAMPS 15” BE BENT TO FORM NNI ; STAR AND CIRCLE à STRAP IRON i CRIMP EDGE TO| — BRACKETS ” l TAKE WIRE FASTEN TO S DIAMETER £y REENFORCE- ROOF WITH £ 10 o" EY CUTOUTS MADE FROM WALLBOARD eal NA B® CUT ON DOTTED A, LINES CORN CONE TOPPED 20 GALLON CAN ` FORCE SPOUT ; DOWN OVER This animated, decoration of Santa and his reindeer is easy to make if above details are followed. A 20-gallon oil drum provided this novel Christmas tree. Cut the cam as shown, insert several sets of tree lights and then solder together and mount the tree on a suitable wooden base. 134” squares. On similar material, lay out the semi-circular background. Cut out all pieces, and paint the silhouettes black and the back- ground blue. Coat this last with shellac and sprinkle with mica sign painter’s brilliants while still wet. Tack the house tops to the front edge and the background to the rear edge of a light trough constructed of 1”x6” material. Wire this trough to take four 50- watt blue colored light bulbs and cut the opening through which the slotted lever passes. Swing this lever on the shank of a long wood screw or heavy nail driven through it from the rear edge of the trough. Screw two wooden candy pail lids together so that their beveled edges form a belt groove and mount it on a ¥4”x3” bolt lock-nutted to the single wood support which projects down CURRENT TRANSMITTED from the bottom of the light trough. A lock- TWO SPRING CONTACTS nutted bolt set on the outer circumference [Continued on page 132] ’ BRASS I STRIPS | T SIGN DOES NOT TUAN HOLLY LEAVES TIED TO BURLAP AND CEMENTED TO REVOLVING FORM This beautiful Christmas Wreath is not only illuminated, but revolves, as well, around the center greeting. Below it is shown the motor speed reducer. Inventions, January, 1937 95

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PIPE FITTINGS FORM MODERN DESK pace FOR TRACKS FINISHED TABLE FLANGES COUPLINGS bb a 5!x2' Ui. 5-PLYWOOD «m JoY c E 18" LEGS MADE FROM 3/a" PIPE MATERIAL | BRACE TRACK E BAR -4' FOR CARRYING vo pie wie Fashioned from lengths of scrap pipe this modern typewriter desk features a sliding typewriter platform so that the machine can be pushed out of the way when not in use, The top is cut from a panel of five-ply veneer. Utilizng Home's Odd Corners tracks. TYPEWRITER desk styled after the modern trend can be assembled in a few hours from a few lengths of scrap pipe cut down, threaded and joined with the necessary fittings then at- , tached to a plywood top. A unique feature of this desk is the sliding typewriter platform which permits the machine to be pushed to the rear of the desk when not in use. Cut the pipe to the lengths indi- cated in the diagrams shown at the left and after assembling attach the top which is a 5-ply veneer panel measuring 2 by 5 feet. In the center of the desk top place a pair of showcase door tracks for the typewriter platform to roll on. The platform is cut from a piece of 34-inch white pine and measures 215 by 1 feet. Rollers are attached to the bottom of the platform to match the desk top The completed desk can be enameled in any modern contrast. Blue, green or red N NEARLY every home, both new and old, there are many nooks and corners that can be converted with a little work into valu- able storage space. Take for example a home that at one time had been fitted with sliding doors, but which since have been removed to abide with the changing times. A door constructed of wallboard to fit the sliding door recess ean be fitted with shelves so that two card tables can be stored in them with sufficient space left at the bottom for several umbrellas, canes or other long compact articles. The space just under the stairs landing is also valuable storage space and by constructing a suit- able closet or cupboard many small articles can be conveniently stored away when not being used. The cupboard should follow the construction of the stairs and be provided with rollers so that it can be pushed out of the way after articles have been deposited in it. The shelves make a convenient place for junior's toys. 96 STAIRWAY. CUPBOARD SHELF. SHOW CASE TYPE TRACK POZIE FLOORING closet space. NNI ERS : EZ X NC” ROLLERS enamel may be used for the top with the metal frame in a silver finish, The typewriter platform is enameled in black. The type- writer is permanently left on the platform. T To NX Cw] OLD SLIDING OOR RECESS LS ; bat CONCEALING PANEL —» Ese ee DIVISIONAL SHELVES A] ME RN E ! | i WALL | RD ARD TABLE CUPBOARDS Odd corners about the home can be converted, as shown here, into valuable A hollow wallboard door inserted in a sliding door recess makes a handy card table closet. Space under stairs can be utilized, too. Modern Mechanix Hobbies &

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“Jumping Jelf’—A Tiny Tot's Toy When completed "Jump- ^ ing Jeff" will gayly bob d his head to the delight of the child straddling him. Directly above’ is shown the mechanism that operates the dog’s head. The wheel is a baby carriage type with wire spokes removed and a plywood disc inserted: by Ralph T. Moore FAR cry from the “straddled broom- stick" and certainly more interesting is “Jumping Jeff,’ a pup who nods his head back and forth when ridden. Children like colorful animal toys and an animated one like this is an added delight. The pup is simplicity itself to construct and the material requirements are commonplace. First lay out the head on a piece of wood 14"x9"x75" and saw out on a jig saw. From V4" plywood cut out the ears and nail and glue them in place as shown in the accom- panying diagrams. The stem piece is laid oui on a piece of wood 30"x4"x7$", the curved shape is marked out by means of a thin strip of wood. The stem width is 114" and for this an old chair rocker serves admirably. Cuta straight piece 10"x7&"x134" and fasten it with wood screws as shown to the curved piece. Drill the head piece and the stem with a 54” drill and into these holes drive a %” length Inventions, January, 1937 The upper photo- graph shows how the head is inserted in rocker bar. A pack- age carrying handle serves as reins. At left is shown the method of attaching wheel to rocker bat. "TA zt Mer CRANK "— 1/27 DRILL Construct "Jumping Jeff" according to specifications shown here. Dog's head is copied according to pattern pictured above. Tongue and ears are cut from plywood and nailed in place. of 3$" pipe to serve as bearings. Next cut two side hinge pieces from plywood 5"x215'x 35" and drill these as shown. Nail and glue these to the end of the curved stem. Drilla 4” length of %” dowel through the center with a 4" drill and insert a 16” length of No. 10 iron wire. Bend this as diagram indi- cates and form eyes in the ends with pliers. Obtain an old rubber tired carriage wheel [Continued on page 126] 97

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TINY HAND 'This model ship is just one of the many interesting projects that can be fashioned to exacting specifications by using a hand grinder for carving. Though it has all the marking of the professional modelmaker the miniature craft shown above was made by an amateur model fan. Some details and sanding were done by grinder. by A. T. Dalton O THE man who has a small workshop and limited room at his disposal yet who has a reasonable knowledge of wood- working and desire for carving there should be a very definite appeal in the new light weight por- table high speed electric tools which allow a limitless variation of carving on wood, stone, cast resins and other material of this char- acter. . These high speed, light weight, electrically driven tools are conveniently shaped to fit the hand and owing to their perfect balance can be used over long periods of time without danger of fatigue. The secret of their great usefulness for carving lies in their high speed. A large variety of especially developed steel cutters are used with the unit and leave smooth uniform cut and does not have to be finished by sanding or other means. This 98 POWER GRINDERS Interesting caricatures such as this one are easily carved from solid or laminated blocks of wood. The hand power grinder is provided with a chuck for taking numerous cutting, drilling and sanding tools. This attractive ship lamp nearing the final stages of completion was carved from a block of walnut. The tiny decorative de- signs are being applied to the sail with a finishing bur tool. class of tool is, primarily, a finishing tool and thus lends itself to finishing work that has been roughed out. Another method most frequently used is to cut plywood to the appropriate figure desired and glue the plywood together to form a lami- nated block. For the craftsman who has not had previous experience in woodcarving it is suggested that the rough figure to be carved be cut from a solid block of wood by means of a hand saw. Modern Mechanix Hobbies &

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SIMPLIFY MODEL CARVING BRUSHES A plaque like the one shown here of Will Rogets can be carved by first tracing picture on a flat wood block. Carving wood caricatures is not difficult provided the figure is sketched in front and profile views on the block of wood. Comic strip characters also are ex- cellent subjects for carving and are easily made. SANDING DRUMS AND DISCS The figure shown in the accompany- ing illustrations makes an interesting project relatively simple for the ama- teur craftsman who wishes to try his skill with these new type of hand tools. There are no excessive details such as hands or background with this figure. The squared diagram shows the front AE and side views. "Transfer these pro- = files to their respective positions on the wood-block which has been built up from Carved caricatures can be M x finished in a very attractive plywood or, if you prefer, solid block of wood. manner by painting them : " with colored india inks, water The design can then be cut out with band Wi celu sein cam e en saw, jig saw or with a hand saw. camel's hair brushes will sim- f plify this work especially in Using a rather large steel cutter rough out the painting of facial fea * E tures. Right—-Any of these the design to the approximate figure follow- io mar be dtd dor the ing the outline given. Many craftsmen indi- various purposes to which the cate the form that the model is to take by dou e oli boar hal shading the design that has been drawn and “imple when grinder is used. transferred to the block. This often times serves as an excellent guide for bringing out different characteristics of the carving after it is actually underway. It is difficult, and perhaps futile, to explain the step by step procedure to follow the modeling of the face for an example. With a design as simple as our first figure it is ap- parent that the cheeks, jaws and any portion of the fact are first cut with a relatively large steel cutter. Mustache, eyes, eye-brows and nose are formed with smaller steel cutters of the ball shape and flame shape, a large variety [Continued on page 124] Inventions, January, 1937 , 99

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BUILD THRILLER. TOBOGGAN SLIDE Built of odd lumber, | ©. this sled chute will | er provide many thrills. 207 TOBOGGANS RIDE ON TOP OF RAILS SLEDS RIDE HERE d Ix a" i * STURDY CROSS-SECTION THROUGH POSTS OR CHUTE OR SLIDE LENGTHS oF SLEDS ARE HELD ON TAKE-OFF SLOPE BY QUICK RELEASE GEAR (SEE DETAIL) US The above cross-sec- tion of the slide shows how the guard rails are attached. MODERATE TAKE-OFF AND ENTRY TO "DROP! y LA DROP SHOULD Ar | NOT EXCEED i 45 DEGREES IN PITCH LENGTH OF POSTS TO SUI GROUND LEVEL OFF GRAD- UALLY FROM END OF MAIN DROP IF NATURE OF GROUND NECESSITATES THE USE OF LONG POSTS DIAG- ONAL BRACING SHOULD BE NAILED TO ALL SUCH UPRIGHTS TO STRENGTH- | JOIN BOTTOM PLANKS WITH STRAP IRON ———— ABOUT 20 FEET É EN THE STRUCTURE GROUND LEVEL _ SIDE VIEW OF BANK SHOWING LAYOUT OF CHUTE LIFT HANDLE TO IRON RING RELEASE RING m uS JOIN SIDES WITH Turns should be banked with , By EI LEE CLEATS ORFISHPLATES snow to approximately the -n X EU NAILED AND CLINCHED angle shown at left. The re- 4 al ze STOUT ROPE OR CABLE lease mechanism, at right, is UIT. TRGBER FASHIONED PROM Simply a hook and iron ring. PIECE OF AUTO SPRING LEAF “SPRAYED AND The hook is provided with a FROZEN. lever so that sled can be re- ANGLE IRON PIVOT BLOCKS c leased after riders are seated. BOLT TO BACK END OF 4 á SLED OR TOBOGGAN HOW SLEDS ARE HELD & SECTION THRU SNOW WET DOWN AND ICED RELEASED AT TAKE-OFF TRACK ON CURVES. | ONSTRUCTED mostly from sections of SUE BJT l 2"x4" scrap stock this sled or toboggan i | i | i e AGAINST BANK slide will provide plenty of winter sport T s SRA AO j thrills. Install the slide on the side of a hill = BANK — Qr keeping the angle under 45 degrees as a safety i END T è à STEEPLY DIMINISHING measure. Lay out a banked track according 2 BANK SUGGESTED to the suggested layout shown so that you >- LAYOUT FOR A return to the starting point. A catch is pro- . BANKED SNOW TRACK vided so that the toboggan can be attached to the chute while riders are taking their places. 100 Modern Mechanix Hobbies &

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BLACK MANE AND [a t TAN BODY — t

t

+ 4t ROBES

e 1) HH HANNE H E: PHATA E EH

DRIVER -— Tan

[A waite A PANTS

zx

115

'The patterns for the circu: characters should be laid off in V4 inch squares in this manner.

GOLD. DECORATIONS ON CHINESE RED pipi | a x DARK GRAY ON LIGHT > a 178" Pe VENEER E o nf CES LAY OUT IN, 174!" SQUARES BLACK HOOVES AND HARNESS ho <2

if am LIT IRUNNING HORSE Piles à var à ARN SQUARES CLOWN | MONKEY 1 t WHITE WITH PAINT. PAINT CREAM COLOR, COLORED SPOTS BROWN RED PLUME AND HARNESS HIS colorful little circus can be built with a scroll saw and paint brush, and is designed for simplicity of construc- tion. Once the bristol-board patterns are made a dozen units can be run off in a short time, Profiles of animal cage, draft horse and driver appear in center illustration. The squared diagram supplies all of the di- mensions for the smaller figures which should be cut from thin plywood, or !$" veneer. Quarter-inch plywood is used for the wagon and the wheels, which are solid disks of the sizes given. A quantity of these can be cut on the scroll saw by stacking several pieces of plywood and tacking them together. Four stencils are required for the painting— a red rim, two sizes of 8-pointed stars rep- resenting the spokes and another for the black area between the spokes. The cage is painted red with gold decorations. It is best to paint all parts before assembling. The [Continued on page 130] Inventions, January, 1937 BODY; HEAD PIECE, WHITE, BLUE UNIFORM - BLANKET; GREEN, RED STRIPES 4 “SOLID. DISK WHEELS, PAINTED WITH 4 STENCILS == ^

SLIOE-UP GATE

E

REAR AXLE Dance. BACK SLIDE T HOLE DROP Fora cinarre Make the circus wagon according to dimensions given above. Construction is of plywood with decorations applied with stencil designs. PAIRS ARE CAGE AND TEAM CONSTRUCTION MAKE CAGE FROM 174" PLYWOOD

272" X 2" SQ Applicator dowels as used by doctors make excellent bars for the wild animal cage. A hole in the roof allows the giraffe to protrude his neck. Assemble teams according to diagram. ELEPHANT EAR I$ MADE FROM GRAY TIRE TUBE ELEPHANT

BAND IS — ELEPHANT PULLED IS 5" x 6"- TIGHT USE i74" AND PLUG SQUARES INSERTED TO DRAW | This performing elephant can be made to assume all sorts of trick positions to the delight of the kiddies. It is cut from any available stock. Ears are cut from pieces of auto inner tubing. 101

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COMPLETING the Authentic in every detail this minia- ture of the famous Mayflower can be built by anyone handy with tools. This final install. ment covers paint- ing and rigging. by Erling W. Eklof PART III AVING completed all hull and cabin details on the model Mayflower as de- scribed in the November and December, 1936, issues of Mopern MkecHANIX HOBBIES AND INVENTIONS final work on the painting and sail rigging of the ship may be started. In these, the final stages of your model extreme care should be exercised in painting and assem- bling the sails and their rigging so as to fol- low out the authentic details as much as possible. For painting the model, you will need at least one small sharply pointed brush to get into the small places and one flat 44-inch chisel shaped brush. You will also need one can of light oak stain and one can dark mahogany. To get the desired shades mix these two stains in varying proportions. Blue, white and black enamel and varnish will be needed as will tubes of oil paint in yellow ochre, Indian red, raw sienna and dark green. Now you can start the decks. You want a light natural woody color. Get this by using just a touch of dark mahogany in light oak stain. Don’t let it get too dark. You want 102 some contrast between the decks and deck fittings which will run to a little darker than medium brown. Make the inside of the bul- warks a little darker than the decks, and the timberheads a shade darker with railings and steps quite dark. You will find by rub- bing a little Indian red on the steps, ladders and rails that they will get a slightly worn appearance as if human feet and elbows had rubbed off some of the finish. The outside of the bulwark and wales is a rich brown chestnut color. The channel be- tween the lower wales is black with Indian red brushed in and under the beak and trail boards some musty dark green. Below the wales, stain the hull dark brown. Rub some yellow ochre along under the water line where the hull has its greatest beam. Rub or brush in dark green under the counter and under her belly coming up in close to the stem. Blend in these colors as if worn in by the ravages of time. On the trail boards and rails at the beak the conventional design of the time in black and white and blue and white should be carefully painted on. The same applies to the stern castle sides. I chose blue because it is a symbol of water and the sea; also designating faith and hope which is particularly appropriate to the pilgrim ship. Over the design, rub in a few light rusty stains; just enough to make it appear old. Paint a fine thin red line on the upper edge. Make the masts and yards a medium reddish brown, the panels in the doors black. The indentations on the fluted capstan and the top of the capstan are black. The cleats are light and worn. Paint the long boat the same as the hull of the ship. The thwarts and sail locker are a natural wood color. Stain the oars and mast. The wales of the long boat should be light. In regard to the design on the stern of the Mayflower, you need not adhere to my origi- nation providing you have an appropriate design of your own. May I describe the sym- bolic significance of the design. The flower at the top of the design is a semi-heraldic rose, the rose being, as you perhaps know, Modern Mechanix Hobbies &

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Inventions, January, This is the Mayflower com- pleted, truly a magnificent piece of craftsmanship. In order to retain the beauty for years to come the ship should be finished in stains -that will not fade or lose their tone. Artists’ oil paints of good quality will insure a lasting finish for parts that are in color. c t2

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PLAN Simplifies the RIGGING of Mayflower Model INIT FIVE MHA STP UYS amar = à — k En B ir] dry [f |pi2019 CVE $508, et "VO O4 3AsYIog 3A80v3a M P AVAD SA IAO MÀ HE 73g do BO i Goes 21204404 "OX e A — tht tf JEDDERI ~ TS i NI JA D LI LIS Atel [TI 9 D NIIT p x ve PEI ISR ASH MS S pe ae = === Yo GAVR WSAOL FOP SV L-BWWS GAVA WYSAIOL NIVIY 2/27 Modern Mechanix Hobbies & stained with oil color to add an authentic touch. Needle with closed end of head broken off and crochetin: needle make handy rigging tools. In rigging model be sure to use grade of cord called for, heavy, light or medium linen cord is used in the work. The linen cord may be 104

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le- 3416" ROUND — DEADRV ES 56-176" OVAL DEADEYES 66-3/16" BLOCKS 54-178" 3 TYE BLOCKS Twice Size 22 - 3716" BULLSEYES | - SISTER C— NO. 18. BRASS WIRE JIG FOR LINING UP DEADEYES AND LANYARDS the floral symbol of England. Since the May- flower, as far as we know, was not in the King's service or owned by nobility, it seems reasonable that the pure heraldic rose would not be particularly significant. The dolphins, the symbol of the religious life and Resurrec- tion is appropriate to the pilgrim ship and in addition is a sea ornament very often used. Paint them green with yellow bellies and fins. The ray-like background behind the rose represents the light and the new way to free- dom. Paint the stripes alternately Prussian blue and dull carmen. The urn of earth rep- resentative of the humble characteristics of the pilgrims supports the flower and the dolphins. It is painted red with a gold wing design outlined with light green lines. The background behind the urn and around the dolphins may be painted Prussian blue or stained dark brown. The name Mayflower in red goes underneath. Rigging your model is next and should be carefully done. For this you will want four Inventions, January, 1937 28 - 3/16" OVAL DEADEYES At left is shown the var- ious forms of tackle used in rigging the Mayflower. They can be purchased ready-made or turned on a small lathe. Use jew- elers wire for the metal parts .as in the case of pulley hooks. Below— The Mayflower after the painting has been com- pleted with the rigging not yet installed. E EDEN MINORE [ SRC A AYA a a rao Oe sizes of cord, heavy, medium, light and fine. You will need 56 Mi-in. heart shaped dead- eyes, 28 ;4;-in. deadeyes heart shaped and 16 round ;%;-in. deadeyes, 22 j-in. bull's-eyes, 54 %-in. single blocks and 66 4-in. single blocks, 16 !4-in. single blocks, 3 tye blocks and 1 sister or fiddle block. You can use round deadeyes in place of the heart shaped as perhaps they are a bit easier to make. Boxwood or gumwood is used for deadeyes and blocks. Round deadeyes and bull’s-eyes can be turned on a lathe in this manner, using a dowel stick of the required size and about 8 in. long. With a special tool about the thickness of an ordinary table knife, cut a groove almost to the center, leaving enough wood to prevent it from breaking off too easily, then cut the slight groove that goes around the deadeye. Cut deep again to form the other side of the deadeye. Repeat for the next deadeye, remove from the lathe and cut the separate deadeyes apart. Make a little tube or cup to hold two or three dead- eyes, one above the other. Drill the three holes required. Bull’s-eyes can be made the 105

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The topmost illustrations show the Lanyard threadiag and dead-eye mounting arrangements. Sail rigging is simplified by lower diagrams showing how linen threads fasten to tackle. 106 same way. Drill one hole in place of three. By flattening the sides of the dowel, blocks may be made in the same fashion. Drill one hole near one end of the block. In the event that you have no lathe to use, you can reverse the process, drilling the holes in the end of the dowel, then grooving and cutting off with a hand scroll saw. Very fine blocks and dead- eyes can also be purchased from ship model supply houses. It is essential that deadeyes and blocks should not be used too large or the appearance of the whole model will be spoiled. Concerning the sizes of cord for rigging, the heavy rigging used for shrouds will be No. 5 mercerized crocheting cotton. For the medium, No. 10; for the light, No. 40, and for the fine used for lanyards and ratlines, No. 60 serves very well. This may be obtained at any dry goods store. Dye the heavy, medium brown, and the medium cord, just a tint lighter. The light and fine cord numbers 40 and 60 respectively should be dyed a tan color, a shade darker than ecru. To do this, draw the cord through dye or stain of the de- sired shade. If you wish, you may use linen fish line which, outside of being stronger, has no particular advantage. After having stepped the masts glue in the bowsprit and lash it down with the gammon- ing. Use the heavy cord for this. Throw a hitch around the bowsprit and slide it down to the cleat. The cord goes through the for- ward end of the slit in the cutwater from the port side to the starboard. Then up around the bowsprit from starboard to port for about eight turns. Wind the cord around each half of this lashing and secure it with a clove hitch so you will be able to wind about five turns around the whole of the lashing. Fasten the end with a good knot and the gammoning is completed. Next come the chain plates. They are the straps that go around the deadeyes and secure them in their position just above the chain wales. They are made of No. 22 brass or aluminum wire. Bend the wire around the deadeye and make a twist to secure it and then below where it fastens to the hull, make a small eye in the wire to take a pin. Where the chain plates are secured to the hull, there is an iron strap (make this with red fibre) that follows the sheer line. Be care- ful to keep the deadeyes even. After you have all the chain plates and their deadeyes in place, take a piece of heavy cord and seize it around a %4-in. deadeye. To aid in setting up the shrouds, make a U shaped Modern Mechanix Hobbies &

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sharp cornered form from No. 22 wire to hold the deadeyes about two of their lengths apart. Insert this wire form in the hole of a left hand deadeye on the chain wale and put the other end through the deadeye seized to the heavy cord. Now pass the cord up through the lub- bers hole, around the mast and down through the lubbers hole on the same side, and seize a deadeye to its lower end, even with the first. Draw a lanyard of fine cord through these two deadeyes in this manner. First tie a knot in one end of an 8-in. cord. Reeve this through the right hand lower hole of the upper dead- eye looking from the outside with the knot in back, then down to the upper right hand hole in the lower deadeye, then up to the middle hole of the upper deadeye, down on the outside to the corresponding hole in the lower deadeye, up again to the remaining hole in the upper deadeye, and down to the left hand hole in the lower deadeye and fasten with a clove hitch where the shroud is seized to the upper deadeye. Do not cut off the loose end as yet. Now take the wire form off of the first set of deadeyes and run the lanyards through them. Draw the deadeyes even and secure with clove hitches. Cut off the loose ends. Seize the two shrouds together directly under the cross trees. Do the same on the port side then back to the starboard and con- Fore sail rigging details are made clear in this rigging diagram. Before starting on the actual sail construction read carefully all text pertaining to this part of Mayflower model so as to avoid errors. Sails are cut from linen. U FORE SAIL BOWLINE | 2E TOP SAIL BOWLINE 2M SPRIT SAIL HALYARDS 2N SPRIT SAIL-GARNETS 20 TOP MAST STAY LEAD 2P SPRIT SAIL LIFTS - 2Q SPRIT SAIL BRACES _ 2R SPRIT SAIL CLEWLINE 2S SPRIT SAIL SHEET Inventions, January, 1937 tinue until all the lower main shrouds are on. Keep the mast in the central position, but leaning aft a little more than one part in thirty. When the main stays are put on, they will pull it forward to its correct position. The fore and mizzen shrouds are done in the same method, but because of the odd numbers of the shrouds, they go around the masts and to the opposite side instead of in pairs on the same side. Let’s get at the stays. Lay up three parts of heavy cord by fastening the three ends in something firm and twisting the other three ends with an ordinary hand drill. Two cords twisted similarly will serve as the mizzen stays. Saturate them with thin model aero- plane glue to keep them from unraveling. The main stay is double in the form of a strap. It goes up between the cross trees and around the mast; the other end goes through a hole in the stem. The whole stay is.pulled together with a lanyard using the ;,-in. round deadeyes and passes on each side of the fore mast, the lanyard being situated immedi- ately behind this mast. The fore stay is fast- ened by a lanyard, its lower deadeye lashed [Continued on page 126] TOP FORE MAST STAY a^ 1 EP. FORE MAST STAYS A di pua /| CIRCULAR TOP LEFT OFF i "EA 107

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GENERATOR MAKES GAS FOR COOKING HOME aw GAS \ ROPE AND ROPE AND PULLEY MAKER WHEN AIR IS DEPLETED, PULL vA DROM AND OPEN AIR INLET à SMALLER OIL DRUM FILLED WITH AIR D EYE BOLT- FITTED WITH wae and BELIA ES AN LOW 2 oF LOCK. NUTS AND WASHERS pam SINKS O LOWER DRUM HOLD- ING AIR PRESSURE d ut CUT OUT BOTTOM OF SMALL DRUM : a TIEA | Lr LARGE OIL DRUM- cur OUT TOP AIR PIPE-RUNS UP THRU CENTER OF LOWER DRUM iTO SLIGHTLY ABOVE LOWER DRUM TOP INT OR ENAMEL by A. H. Waychott O LONGER need any home be without the conveniences offered by city gas. A practical gas generator can be built with or- dinary tools at a cost well under five dollars and when completed will produce a safe vapor gas at a cost far below that of either artificial or natural cooking gases. The generating apparatus consists of a pressure tank and vaporizing unit. While an ordinary air compressor could be used to operate the vaporizer, the pressure tank is by far the most economical, since two oil drums 108 K 4 Wwe FUNNEL~ SoLDER TO. VALVE- GASOLINE IS : | —- POURED IN HERE TO HALF FILL CAN SCREW. TOP-SHELLAC AND SCREW TIGHTLY. ^ NIPPLE-FLEXIBLE TUBE OR PIPING EX— TENDED FROM HERE TO BURNER APPARATUS et LOWER DRUM iS FILLED WITH WATER FLEXIBLE IUBE . V y^ pe VALVE-CHECKS FLOW OF AIR TO CARBURETOR Anyone the least bit handy with tools can make this practical gas generator. The device manufactures gas vapor for all cooking purposes at a fraction of the usual cost. Ordinary gasoline is converted into a safe dry fuel which can be used with any gas range or refrigerator. The cost of building is less than $5.00. are the only materials, except for a few pieces of pipe, needed to build it. The vaporizer consists of a one-gallon can containing a “car- buretor” which mixes the air from the com- pression tank with liquid fuel, in this case good gasoline, to produce a safe vapor gas. The carburetor is a simple affair, consisting of a length of pipe drilled along the top with small holes, plugged at one end and bent into a circle just large enough to fit in the bottom of the one-gallon can. The carburetor con- nects to the pipe projecting up through the large oil drum by means of a flexible hose. Assemble the compression tanks in the [Continued on page 122] Modern Mechanix Hobbies &

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"MIKE" LAMP SERVES AS RADIO DECORATION Fashioned from odds and ends this attractive microphone lamp provides novel illumination for radio receiver. Phone base, radio knob, springs and piston ring comprise its form. OOKING very much like the familiar radio broadeasting microphone this odd radio lamp will attract the attention of everyone who sees it. Odds and ends are used in the making of the lamp, which uses an old tele- phone base for the stand, a large size piston ring or metal band for the microphone ring and a turned metal or wooden dise for the dummy microphone. Two holes large enough to pass a medium sized machine screw are drilled in the ring opposite each other. A bolt passed through one holds a chain socket in place while the lower hole serves to.take a longer bolt which holds the ring, radio knob and base assembly. Small holes into which screw eyes can be forced are drilled at proper intervals for the attachment of the springs. The microphone dummy is a wood or metal disc about 314 inches in diameter. After the turning is completed it can be painted with aluminum bronze and trimmed with black enamel Four screw eyes are attached to the side of the microphone and the dise sus- pended in the ring with small wire springs. Should the builder possess an old telephone transmitter or radio earphone unit this can be substituted instead and connected through the radio receiver for stunt broadcasting. An inexpensive parchment shade clipped over the bulb completes this original radio lamp. Inventions, January, 1937 PROG, STEEL BAND SCREW_EYES Magnet Opens Secret Lock HERE a practical lock is desired without the objectionable exposed keyhole a magnetic type may be used without anyone discovering the secret of its operation. A hole into which a %4-inch rivet can fit loosely is drilled in the underside of the desk top and a metal plate mounted flush over it so that just the rivet stem may pass through. A hole the size of rivet is then drilled in desk drawer, the copper guide installed and the lock is ready for use. A large magnet serves as key. TO OPEN, HOLD - a” RIVET ^ WASHER HELD WITH \ 2 SCREWS When held directly over the rivet the magnet lifts it, freeing the drawer. A spring copper guide attached directly in back of drawer catch permits its closing without jamming the rivet. 109

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The simple coaster pictured in the circle above is the ideal project for the beginner in metal spinning. Before any actual spinning is done a hardwood form or mold must first be made. Above is shown a completed mould in the lathe. by Dale R. Van Horn OME soft metal lends itself so admirably to manipulation in a wood turning lathe, that projects involving its use are an inter- esting home shop diversion. With some patience one can turn out very presentable creamers, trays and boxes with lids from sheet brass, aluminum and copper. Sheet lead is so ductile, easily worked and bears such a close resemblance to pewter when finished, that this metal is ideal for the beginner in spinning metals. This article covers briefly a number of simple projects, each one easily made. It also touches the use of a metal lathe for harder metals. One of the easiest ways to spin soft metal dishes is as follows: Briefly, you need two pieces of wood and a sheet of metal. Turn one hardwood block to the shape you desire for the inside of the dish: Turn another small block from 144 to 2 inches in diameter and about 14 inch thick with one side smooth, the other carrying the deep indentation of the 110 METAL After the metal sheet has been turned to fit the wooden form the square corners are trimmed off with a regular lathe cutting tool. Right—In spinning this aluminum dish run the forming tool from the center of the work until the sheet metal fol- lows the shape of the hardwood form. FORMING TOOL dead center. The sheet of lead is centered between these two blocks, rubbed with candle and the metal gradually forced over the form. Should there be any tendency for the metal to work out of line, make a depression in the right end of the mold not more than the sheet metal thickness in depth and see that the tail stock wood block is a little smaller. Then turn the tail stock up tight. This forms a bulge in the metal sheet which locks it in position so long as the tail stock is turned up snug. After forming, the metal is polished, the waste trimmed off and the piece then dipped in lacquer. Sheet pewter, aluminum, copper and brass can be turned into small, attractive dishes in the same manner. Modern Mechanix Hobbies &

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PROJECTS ON A LATHE ss Vat | $ 34," GROOVE LEAD "d > ZEAD EDGE LOCK SORTS TT IT A RT IPI TP I EE DiS Sed a eae CE TE TT i LI AR M zt — Co FA LEAD INLAYS IN GROOVES CUT WITH FILE TANG 3732" WIDE This cross section diagram gives all e dimensions needed in turning and spin. ning the inlay ash tray. After completing the lead ash tray lining polish it with steel wool until it is the color of pew- ter. Lock lining in wood bowl. Access to a metal turning lathe simplifies greatly, the work involved in forming shallow dishes from soft and semi-hard sheet metal. A little coaster of sheet aluminum of con- siderable thickness was formed in a jiffy in the metal lathe setup. The hardwood block turned to shape, acts as a mold for the coaster. Any round tool can be set in the tool post, then the metal forced to the shape of the mold : and later the waste cut off. After forming the piece should be rubbed with coarse steel wool. Rough aluminum or copper pin trays can be made without special rigging in the wood lathe by using a wood mold and letting the edges take whatever shape they wish. Inventions, January, 1937 Wm This beautiful inlay turning can be duplicated in your shop after doing some experimenting with the more simple projects. he bowl is turned from walnut and the inlays filled with strips of lead. The bowl lining is spun from 5" sheet lead. Let's next try a simple, all-metal ash tray which can be made in groups of four for home use or bridge parties. From a wholesale plumbing or hardware concern, get sheet lead having a 4l5-inch thickness. Turn a soft wood block down in the lathe to 4 inches in diameter. Bend the lead corners over the side of this and tack in place. Start up the lathe and with the round end of a dowel, rub the lead flat against the wood. To reduce friction and heat and to prevent possible cutting of the lead by the dowel, rub the metal surface with a candle stub for lubrication. At high speed, rub this now smooth surface with fine steel wool to give it a good luster. Then wipe with a rag dipped in soda water or vinegar to cut off the grease. Cut another hlock of soft wood 314 inches square and rather thick, then with the drill press, bore a 12-inch hole from each of the four sides to the center of the block. Center this block in the lathe and turn away enough of the right side to expose half of the holes, turn the block round and sand smooth. The lead square is laid over this with the polished side next to the wood and the corners again tacked fast. -Using the dowel again, and the candle stub, the unfinished side of the lead is smoothed and worked into the shape of the wood mold. When the depression has been made, remove the whole unit from the lathe and, laying a lil

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This attractive dish makes a novel pin tray when completed. After successfully completing the aluminum coaster you are readv to advance to this project which is spun from aluminum. Turned in the same manner as the inlay ash tray this bulb dish makes an attrac- tive decoration for the living room. SHEET ALUMINUM COASTER r Dimensions for aluminum coaster, pin tray and lead ash tray, shown below, are given here. In spinning the articles exercise care during forming operation so as not to tear metal by ap- plying too much pressure. To spin this lead ash tray first drill 12” holes in a block of thick stock 4" square. Holes are drilled completely through in erosswise fashion, When block is cut cigar grooves result. Left—The completed lead ash tray as it appears after comple- tion of the turning opetation. The form used in spinning was turned from the wood block shown above. 112 34-inch dowel or iron rod squarely over the four grooves, strike sharply with a hammer. The lead is forced down to the shape of the finished tray. Putting back in the lathe will be necessary for polishing with fine steel wool. Finally, the waste is cut off by holding the point of a jack knife on edge, resting on the tool rest, and the lathe turned by hand. This insures a smooth cut-off. Before dipping in lacquer, wipe again with the soda-soaked rag. The finished ash tray is shown in the accompanying illustrations. If a set of four trays are to be made, you can use only one bloek of wood for the form, smoothing the lower sides of the four sheets, then turning the mold and finishing the four. A more elaborate ash tray, one which will not need apologies on any office desk, is made in the form of a lovely walnut box with lid, the upper area of which is overlaid with sheet lead to prevent burning. A small hole in the top permits cigarette butts to be. dropped inside where they go out almost instantly. This is turned from two walnut blocks 515 inches square and about 2 inches thick. One block becomes the lower half, the other the top of the tray. Turn the bottom to the di- mensions shown. It will appear as figure 6 shows when completed. Bore a small hole clear through the center of the other block to insure centering, since this is turned first as shown in figure 7, then reversed in the lathe and the top turned to shape so that it will then look as figure 8 shows. Note that a groove is turned for the edge of the lead to lock into and that the surface is lowered about the lead thickness to give a smooth outline later. A lead sheet is cut and centered at the tail stock, rubbed with candle and with a dowel, gradually worked over the top until it fits tightly. With a sharpened dowel, the lead is forced into the groove, the surplus cut away, then sanded and finished. Note that the lead must be carried over the edge and locked at a point where the diameter is a little less than the maximum diameter over which the lead is laid. This locks the overlay in place and prevents it from work- ing loose or coming off. Use steel wool, only, on the metal and wipe it with the saturated soda rag. The best way to lacquer the metal is to flow on the liquid, letting the surplus run off. This should be done right side up. When dry, put back in the lathe and buff with steel wool, then polish with a clean cloth. Finally bore a 14-inch hole through the top completing the ash tray. [Continued on page 124] Modern Mechanix Hobbies &

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| MICRO-TEST YOUR HEN the average driver looks at his speedometer and notes that it's time for his regular oil change, he usually wonders whether, after all, his oil really does need changing. Unfortunately, he has no final check other than the word of the service sta- tion attendant. The result is that his oil is often changed long before it is necessary or it is left in the crankcase far too long. There is a simple, sure method of seeing just what the condition of your oil is. All the equipment necessary for this experiment is a few strips of blotting paper and an inex- pensive microscope. A microscope which has a magnification of twenty-five diameters is sufficient. The idea is to convert the microscope into a semi-dark field instrument. This is done by substituting a strip of white blotting paper, about 1x3 inches, for the conventional glass slide. The movable mirror is not used for di- recting the light, the lighting comes from above the object being examined. An ordi- nary gooseneck lamp will serve very well as a source of illumination. Remove a drop of oil from the crankcase. Place it on a strip of blotting » paper and note how rapidly it a spreads. This is a good test of the amount of gasoline dilution. Now place the strip in the microscope, and adjust the light so it strikes the paper and reflects into the . microscope. As the oil sinks into the blot- ting paper it leaves the carbon and metal fragments on the sur- face. The strong side lighting brings these into sharp relief. The metal particles gleam, while the carbon shows a dull black. A good check on the amount of carbon in the head and on the valves may be made in this manner. Inventions, January, 1937 Right—Oil satu- rated blotter be- fore oil had been placed in crank- case. Top picture shows particles of foreign matter in oil after used. Checking the amount of for- eign matter in automobile cylin- ders requires only an inexpensive microscope set up as shown here. Samples of oil for making this interesting test can be removed from any car simply by pulling out the oil level gauge and applying a drop of oil to a piece of white blotting paper. Oil containing impurities will sparkle. 113

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TIPS FOR MODERN MOTORISTS Tubing On Manifold Helps Car Heater HE temperature of the average automobile heater very seldom is sufficiently high for driving in cold winter weather due to the amount of hot water tubing exposed to the cold blast of air produced by the momentum of the car and the fan. The temperature of the average hot water heater can be raised considerably by replac- ing the original tube that connects to the radiator coupling hose with a length of cop- per tubing. Fasten the copper tubing to the manifold with copper wire wrapping a layer of asbestos paper over both if you desire the maximum amount of heat.—William Tatina, “WRAP COPPER TUBE IO. 0 ~ | Chicago, Illinois. MANIFOLD WITH COPPER: WIRE Piston Pin Makes Garage Door Roller ie SUPER HEATER COPPER TUBE INSERTED ISTON pins which have been taken from a salvaged car make good rollers for use on garage doors. The | doors are mounted between guide strips with the piston pins fastened in place with large lag screws. Where the sows 4 garage is provided with a concrete floor the rollers may || STRIP bë installed in a track in the garage floor so as not to in- terfere with the car’s entering and leaving. The rollers I LEA will provide easy garage door operation.—Curtis Wilson, 7| ES) cue / BOARD San Antonio, Texas. - |f “Brace PISTON ae us o eam Valve Aids Winter Starting VALV M T - x UCH of the disagreeable trouble expe- rienced in starting a car in cold weather can be eliminated with a replacement gas tank cap and an old inner tube valve and stem insert. Drill a hole large enough to pass the valve stem and then attach the cap to the gas tank. Connect a hand pump to the stem giv- ing it about a dozen strokes with both choke and throttle controls pulled out to maximum. Now step, on the starter, allow the motor to make a few revolutions, and push in the choke.—Q. G. Biegert, Junction City, Kan. P d GAS TANK CAP Wheel Puller Made Of Old Bearing |: : = B? DRILLING a hole through the center of the cap of a model T connecting rod bearing and inserting a bolt and nut as illustrated a strong timing gear puller can = / be constructed. Lodge %-inch bolts in the gears through : ee the outer holes of the bearing and apply the necessary —— J TIMING GEAR - * a z APPLY PULLING pressure.—A. G. Kociyan, San Leandro, Calif. PRESSURE WITH TOP BOLT 114

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Sturdily constructed Battery Charger will give years of trouble-free service —now CHARGE BATTERIES and make the enormous profits this busl- ness pays, Every Battery Means 75c to $1.50 for You Battery-charging service is almost ALL PROFIT! Be- cause it requires a minimum of time, labor and attention from employees, it costs little in operating power, yet brings you cash profits as high as 800%! Now you can stop sending customers and their money to competitors. Now you can keep these big profits—hundreds of steady extra dollars every yeat—right in your own shop! Day and night, Saturdays, Sundays and holidays, too, WON- DER CHARGER works away, making big, easy profits for you. Helps you give customers the service and sat- isfaction that builds good will and a growing, profitable business. Mail the Coupon for details NOW. "h^" NEW : 2 ELECTRIC NUS ARC WELDER $3925 Complete with Accessories Now easy to add hundreds of dollars to your profits, With Aladdin Elec- tric Arc Welder, you can do all types of heavy and light welding; motor biocks, fenders, axles, frames, bodies, gears, bumpers, etc. Works from 110 er 220 Volt Socket, Costs only few ponnles an hour to operate. Experi- ence not needed. Check coupon for FULL DETAILS. | minute! profits thls $3.000. Check coupon for detalls. RELIANCE || ELECTRIC | PIPE THAWER Thaws any frozen pipe In Clean up extra winter with |. costs only $39.25 complete —does work of machines costing up Make $2.50 to $15.00 a job. Make Money DAY and NIGHT! Yes, it’s true! A big, professional, 12-battery-capacity, 6- ampere charger —FULLY GUARANTEED—only $19.75— only HALF the cost of old-fashioned chargers. Tke WON. DER CHARGER, at many dollars less than the cost of any other 12-battery-capacity charger on the market, brings YOU and every garage, filling station, repair shop, tire and acces- sory shop an opportunity to make the BIG PROFITS of battery-charging service. More than 40 million autos, trucks and buses in America need battery-charging setvice regularly. Don't turn this business away. Install the WONDER CHARGER at only a fraction of the cost of old-style, high- priced equipment at once! The WONDER Battery Charger Is a blg, sturdy, welded-steel-construction machine. Greatest charg- ing efficiency at lowest power cost. Operates from ordinary light socket, 110-Volts to (25 Volts, 50 or 60 cycle, Measures 11% by 11" by 124%”. Weighs 35 pounds complete. Takes small space—brings BIG PROFITS. Completely charges up to (2 batteries In 18 hours—PROFIT of un to $8.00 a DAY. Has accurate ammeter and embodies every feature of higher priced charger for long, dependable, trouble. free service. Should pay for itself first week! Mail the Coupon for sensational facls. COMMONWEALTH MEG. CORP., Dept. P-206, Cincinnati, Ohio Please rush details of WONDER BATTERY CHARGER, without obligation. Also for machines checked below: D ELECTRIC ARC WELDER DPIPE THAWING MACHINE COMMONWEALTH MFG. CORP. 3785 Beechmont Ave., Dept. P-206, Cincinnati, Ohio When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions | | | Rellance Pipe Thawer— $ | | | | 115

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AMATEUR —— RS In this department the Photography Editor will answer any question or problem related to cameras oj all types, enlarging, printing, devel» oping, taking pictures, and the various phases of home movie making. When sending ques- tions to this department, be sure to include a stamped, addressed envelope in case space does not permit publication of the question and reply on this page. Send all inquiries to the Photog- raphy Editor, Modern Mechanix Hobbies & In- ventions Magazine, 22 West Putnam Avenue, Greenwich, Connecticut, MAKING A COPY OF SNAPSHOT PRINT I have a small snapshot picture which I treasure very highly. I would like to secure an enlargement of this picture, but since I no longer have the negative I have been in doubt about the possibility of this. Since I know very little about photo- graphy I am wondering if you can enlighten me on this matter. —Grace Cook, Dover, Delaware. Good enlargements up to 8 by 10 inches can be secured from small snapshot prints simply by photographing the snapshot on a fine grain film and enlarging this film to the particular size desired. Any photographer can do this work for you. The cost is nominal. TRICK PHOTO RECEIVES $5 AWARD By exposing one half of the film at a time with a “duplicator” Harvey Herdman, Branchville, N. J., secured this unusual picture. The girls are not twins, but one and the same person. For his clever photography Mr, Herdman receives $5.00. ACTION PICTURES WITH BOX CAMERA Is it possible to take action pictures with a box camera? Last month I attempted to take pictures of some of the ex- citing plays during our school's football season, but the results were very disappointing. What kind of camera should be used for taking action pictures?— David Rendown, Phila- delphia, Penna. Action pictures cannot be taken with a box camera since it is fitted with a lens that is entirely too siow for the pur- pose. Action pictures, if they arc to be clear, must be taken with a camera having a L2 or faster lens. The usual box camera lens is an f.8 which is, as you can well see, too slow for recerding action scenes. The photograph editor will pay $5.00 or $3.00 each for | photographs interesting enough for publication on this page. All pictures should be mailed to Modern Mechaniz Publish- ing Co., Greenwich, Conn. 116 Accept No Substitutes! FOR THOSE WHO LIKE THEM SMALL Miniature Kodaks X $5750 KODAK DUO SIX-20 A true “miniature”; compact, finely built, yet it takes 16 alburn-size pictures (155x 214 inches) on a rol) of Kodak Film (four types available). Negatives are sharp; give big, clear enlarge- ments. Shutter, 1/500 Compur-Rapid. Lens, Kodak Anastigmat f.3.5. Price, $57.50. KODAK RETINA $5750 Concentrated photographic versatility .. .lens, anastigmat f.3.5; shutter, Compur-Rapid— 9 speeds up to 1/500 second. Loads with any of five different Kodak Film Magazines (in- cluding new Kodachrome for full-color trans- parencies). Negative size approximately 1x 114 inches. Price, $57.50. KODAK BANTAM SPECIAL This exquisitely made “miniature” fits the hand. Lens, Kodak An- astigmat EKTAR f.2.0. Shutter, 1/500 Compur- Rapid. Military-type range finder, coupled with focusing mecha- nism. Makes needle- sharp negatives for superb enlarge- ments (low-cost size, 244 x 4 inches); or Kodachrome transparencies. Price, $110, Always Insist on the Advertised Brand!

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OR THOSE WHO LIKE THEM LARGER X Laos Kolals KODAK SIX-I6 (f.4.5) — Smallest folding , camera taking 214 x 44-inch pictures. F.4.5 lens; 1/400 Com- pur-Rapid shutter. Price, $40. (With f.6.3 lens, $20; withDoublet lens, $16.) FOR THOSE WHO WANT MOTION x Cond mala CINÉ-KODAK EIGHT Movies at '*10 cents a shot”! The “Eight” makes it possi- ble. A roll of Ciné-Kodak Eight Panchromatic Film costs only $2.25, finished, ready to show. Good for 20 to 30 black-and- white movie “shots,” each as long as the average scene in the news- reels. Price, $34.50. $3450 CINÉ-KODAK “K” Most widely used 16 mm. home movie camera— it's so simple, yet so fine. Makes clear, brilliant movies at the touch of a button. KODAK | RECOMAR 18 Advanced ama- teurs delight in its f.4.5 lens, 1/250 Compur Shutter, self timer, ground- glass focusing And as the user's skill increases, re- sponds to every exacting demand. Loads with full 100 feet of 16 mm. film. With f.1.9 Iens, $112.50. $11250 back. Loads with film packs, cut film, plates. 24x 3M. Price, $54. MAGAZINE CINÉ-KODAK Loads in 3 seconds. Slip in the magazine, close cam- era cover, and shoot. And you can switch to another film in a jiffy, even when but part of the 16 mm. film has been exposed. Effortless loading is only one of six new features. With f.1.9 lens, $125... Eastman Kodak KODAK DARKROOM OUTFIT NO. I Company, Rochester, N, Y. Contains trays, chemicals, developing clips, safe- light, printing frame, thermometer, instruc- tion booklet—everything necessary for first- class work. Also includes the book, ‘‘How to Make Good Pictures." Price, complete, $8.75. ALL CINÉ-KODAKS MAKE FULL-COLOR MOVIES ON KODACHROME FILM When Auswering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 117

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Behind The Razor Blade [Continued from page 61] breakdown. The dies these men produce are accurate to one ten-thousandth of an inch. After perforating, the blade strip is gauged for centrality—a measurement from the center slot to either edge. This distance must be held con- stant. 'The importance of accuracy here can scarcely be over-emphasized, since centrality of the slot controls the proper positioning of the blade in the razor. Since the hardening process requires a surface absolutely clean, the coils of steel are “laundered” in the de-greasing machine immediately before entering the hardening furnace. The de-greaser passes the perforated coil through a soda wash, through high pressure jets of water just under the boiling point, through blasts of compressed air, a scrubbing box, a tank of special grease solvents, through jets of live steam, and finally compressed air again. The razor blade makers were the first to recog- nize the fact that steel received from the rolling mill cannot be uniform, even in a single coil, and that to produce a uniform finished product, the temperature of the hardening furnace must fluc- tuate to compensate for these variations. Since the furnaces maintain a temperature of approximately 1500 degrees Fahrenheit, and the difference between a good and a bad blade can be affected by a change of only 10 or 12 degrees, the control for the hardening furnace must be extremely sensitive and entirely automatic. A "magic black box," situated midway of each furnace, furnishes this automatic control. A mas- ter strip of steel of exactly the correct temper is inserted in this box. If the steel in process does not match this master strip exactly in hardness, the magic box flashes an impulse to a control panel regulating a battery of automatic switches, and the amount of electricity flowing to the fur- nace is altered the required amount to bring the steel to the desired standard. It is in the hardening furnace that the distinc- tive blue effect of a blade is obtained. A patented apparatus feeds a special mixture of gases to the furnaces, and the blue becomes part of the steel itself. As the strip of steel leaves the hardening fur- nace it passes through the tempering plates that make the center section easy to flex when the blade is placed in the razor. A coat of rustproof- ing oil is then applied before the coil is rewound. Samples are broken off of each coil after it leaves the furnace, to be submitted to a hardness test under a diamond-pointed instrument. If a sample fails to meet the required standard the whole coil is rejected and the furnace is stopped until the trouble can be found and remedied. These samples are then sent to the cathode ray oscillograph—the electro-magnetic tester previ- (WOW LISTEN, LARRY TAKE IT FROM ME, LARRY~THESE YEAST CAKES ARE SLICK STUFF TO i | FINISH OFF PIMPLES — F JUST YOU START * EATING. Guy! 118 Accept No Substitutes! GEE CHARLIE — YOU SURE ARE ONE SWELL Pes T AT MY FACE- THAT FLEISCHMANN'S TESST WOREED WELL I TOLD you IT WOULD CHASE THOSE BLOSSOMS- DIDN'T I ? Always Insist on the Advertised Brand!

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ously described. Variations of hardness and tem- per, or any hidden flaws or strains, are revealed here by a green line of light flashing on the fluorescent face of the oscillograph cathode ray tube. So accurate is this device that the passing of a sample through the flame of a match will cause a variation of hardness great enough to bring about a rejection. Next is a bending test to make sure the center of the blade will flex in the razor. Having passed these tests, the coil of steel, now perforated, hardened and tempered, is run through a series of delicate gauges, to again de- termine that the breadth, thickness and centering are uniform. The approved steel is again passed through the "]aundry," after which it goes to the etching ma- chines, where the trade mark and other distinc- tive lettering are etched on the metal with acid. After another examination, the coil is sent to the sharpening machine. Two sets of grinding wheels, one for each edge, first remove the rough stock. Next the honing wheels, cutting at a different angle from the grinders, produce a per- fect bevel on each edge. After being honed, the blades are washed clean and dried with compressed air before passing on to the stroppers of specially tanned leather. Each blade is finished on 280 feet of sharpening surface while passing through this machine. Inspectors stationed at the ends of the finishing SAY- WHATS BITING you? YOURE NOT SERIOUS ABOUT. NOT BEING IN THE SHOW, ARE YOU? READ HOW LARRY'S PIMPLY FACE ALMOST MADE HIM QUIT THE SHOW 3 WITH "THAT =a, Sax- T CERTAINLY AM -WHAT D/vOu FELLOWS "TAKE ME FOR? THINK I WANT TO GET UP AND PLAY IN FRONT OF A BUNCH OF PEOPLE WITH “THIS PIMPLY FACE? am, NOT MUCH! Ugly pimples make any boy or girl want to steer clear of the spotlight. Yet many | machines submit their blades to tests with micro- scopes and gauges, finishing the test by cutting hair with the blades. Samples from the finishers are also sent con- tinually to the laboratory for examination by a photo-electric sharpness comparator. This ma- chine measures the area of the blade edge with a beam of light. As the light traces down the length of the blade, a dot is thrown on a ground glass. With cross-section paper placed over the glass, a girl traces a graph of the blade’s edge. If the graph is straight, or nearly so, the blade is satis- factory. If it is saw-toothed, irregular, some- thing is wrong with the grinding machine. That machine is stopped immediately, and the blades it has finished must be rejected. The finished blades now go to a room which at first glance you would take to be a library. Girls are studiously pouring over, not books, but stacks of blades. Every blade that leaves the factory is inspected by these girls. After passing this last barrier the blades are sprayed with a powerful antiseptic solution, after which they are immediately wrapped, sealed in a wax-paper envelope and an outside wrapper. In an endeavor to improve its product the Gillette Company has several inventors on salary, constantly working on new developments for the razor and blade. And all so you won’t wear whiskers. GOSH - WHY DIDN'T I THINK OF IT BEFORE -IF THOSE PIMPLES ARE ALL THATS HOLDING OFF , LARRY -I KNOW WHAT. WILL FIX'EM! Don’t let Adolescent Pimples keep YOU from being a hit throughout the system. The skin becomes very sensitive, Waste poisons in the blood irritate this sensitive skin. As a result, pimples appear. oung people suffer this em- arrassment after the start of adolescence—from about 13 to 25, or even longer. During this period, impor- tant glands develop and final growth takes place. This causes disturbances Fleischmanu's Y east clears these skin irritants out of the blood. Then, pimples go. Eat 3 cakes daily—one before each meal— plain, or in a lt- tle water—until skin clears. TY by clearing skin irritants out of the blood Copyright, 1886, Standerd Brands Incorporated 119 When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions

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3 eee) A 1 j TURN SPARE HOURS INTO CASH! $40 Weekly | | InYour OwnHo ADDRESS .. 120 No soliciting! No canvassing! We show you how to make big money decorating —fast-selling Giftwares, We start, you with the big $10 Artist's Outfit shown above. We supply you with $150 worth of Giftwares free of extra || charge and show you how to dis- pose of them without leaving your home. We give you 29 Tested Plans for making money. One Flreside Member says, “I made $100 on furniture in one week.” Another wiites, ‘My sales were *q $500 for 6 weeks. This is my first year." R. M. P., of Ill, says, “I did $3.500 worth of business last year and over $12,000 this year.” D. W., New Mexico, reports, “I would not take $1,000 for my Course.” No Experience Needed You too may have a guaranteed income opportunity with Fireside. No tiresome study. You learn by dolng. No artistic ability neces- sary. Our easy 3-Step Method makes the work casy to learn and easy to do and fits you to meke Sood money practically from the start. Quick Sales in Your Home No need to leave the house to dis- pose of everything you make, Our new automatic salesman does all the selling for you. Designed to quickly find cash buyers for all the Giftwares you can tum out. No Cost Plan Send coupon for details of new plan that pays for your Fireside Course besides pulting big cash profits in your pocket, Mall cou- pon now while openings for new members are still being offered. FIRESIDE INDUSTRIES Dept. 142-A Mich. Fireside Industries Dept. [42-A, Adrian, Mich, Send me FREE Book on Home Deco- rating for a big steady income. Also details of plan thai will pay for my Course and give me big profits be- sides. —À— um ces am, pn UN AA. Salt Water Fishing Tackle [Continued from page 78] jerked on the water surface, boiling up the same in a most tempting fashion. Robalo, sea trout, kingfish, Spanish mackerel and others attack such surface lures with a ferociousness that is little short of spectacular. It is an excellent idea to have a 10-inch gimp wire leader connected to the lure to stall off the possibility of the teeth of the fish connecting with the line. There seems to be a belief with some that gut leaders are suitable for protection as between the end of the line and the lure. Gut leaders, how- ever thick, should never be used. Steel wire No. 8 to 10 is generally selected from which to cut leaders ranging from three to five feet in length. Bronze wire size .022 is also much in use. The cuttyhunk type of line is without doubt the favorite in most sea fishing locations on all coasts. These lines are composed of a number of threads, 18, 21, 24, 27, 30 or as the case may be. The 18- thread line contains 18 threads, and so on. The better grade of cuttyhunk line has a dry test of 215 pounds per thread. According to this the 18-thread line will test to 45 pounds, and the 30 thread line, 75 pounds. It is necessary to know this in selecting your cuttyhunk lines. Aside from the fact that the black bass casting rod and the plug lures are used in the inshore waters, around the reefs and river mouths, and in such places where the small sized to medium sized fish often hold out, it may be said that the medium sized to the large fish are almost always trolled for. This trolling is carried on at a rather faster vate of speed than that in fresh water. A method of deep-sea fishing that is much in vogue wherever sea fish are taken is that of still- fishing. 'This involves anchoring the boat off sunken ships, submerged reefs and rocks, around pilings and old piers, and there contacting the mighty. This is a favorite method of fishing for the jewfish, the tremendous finny one which is likely to go into the hundreds of pounds in weight. For jewfish (also called sea bass by some), it will be found that a hand-line, 24 to 36 thread, is excel- lent, although some lines, little short of young ropes, are also used. The hook should be 10-0 to 12-0, shark size, and the bait either a live fish or large cut bait. A method of fishing that is little short of an institution along the upper Atlantic coast, and is becoming increasingly so along the Florida coasts, the Gulf and the Pacific is surf fishing, which calls for a specialized tackle. One wades the surf and casts out. A piece of strip cut bait or half a mullet is generally used for bait and is impaled on a No. 10-0 hook. It is cast and allowed to sink to the bottom where a wait is made for a strike. If a fish is felt at the lure, the line should be fed out, permitting the fish to obtain a good grip on the hook. The hook is then set with a powerful up- ward jerk of the rod and the battle is on. Accept No Substitutes! Always Insist on the Advertised Brand!

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RIGID TESTS PROVE QUALITY OF Genulne Ford Batteries undergolng the cold test In refrigerator where zero temperature Is maintalned, at the Ford Battery Testing Labora- tory at Dearborn, Michigan. MAGINE holding down the starter button on your car for eight min- utes! Imagine discharg- ing and recharging your battery 45 times with an overcharge of 100 per cent each time! Imagine overcharging your battery at a 10-ampere rate continuously day and night for thirty days! Hard on your battery? Yes! Yet these are only a few of the severe laboratory tests that Genuine Ford Batteries, used in Ford cars and, trucks, must pass. No wonder millions of Genu- ine Ford Batteries in service throughout the world have proved their ability to give long, trouble-free service—even on the toughest jobs. Plates used in Genuine Ford Batteries are of the highest quality materials. They have excep- tionally large areas. Only vertical-grain wood separators are used. Posts are fused to lead inserts in the cover to provide additional strength. And cell covers rest on ledges in the case to pro- vide better support for the elements inside. Type 40 17 plate Type B 15 plate These sensitive meters accurately measure battery ca- pacities. The batteries in the tank to the right are undergoing a normal discharge test. Genuine Ford Batteries The high-rate dis- charge test—equiva- lent to holding down the starter button for eight minutes. Regardless of the car or truck you drive, when your battery must be replaced, remember that with a Genuine Ford Battery you can be certain of Ford quality, Ford standards of workmanship and Ford rigid inspections and tests. You can be certain of genuine satisfaction. Forp Motor COMPANY œ DEARBORN, MICHIGAN The complete line of Genulne Ford Batterles consists of a 13-plate battery, two [5-plate batteries and one 17-plate hattery. The last is used as standard equipment in Ford tars and trucks. Type A 13 plate Type 40-D 15 plate When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 121

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AMAZING INVENTION 7, ELIMINATES “ø ALL NEED FOR arr d A costly taps! SHAKEPRODF TAPPING SCREW actually cuts threads in any material! Now, it's no longer necessary to buy expensive taps. Shakeproof has produced a Tapping Screw that cuts a perfect thread and costs a fraction of the price. Easy to use, too. Just punch or drill a hole—insert tapping screw and turn home with a screw driver. Unscrew and you have a full, clean-cut thread — that's all there is to it! Standard Machine Screw Thread z 2, Each Shakeproof Tapping Screw has a standard machine screw thread. Its spring-action slot, plus a special hard- - ening process, makes it an efficient, economical, cutting tool. hy buy costly taps? SPECIAL COMPLETE KIT OF : 5 POPULAR SIZES m, 7, f Think of it —& whole set of Shakeproof Tapping Screws, packed in a neat, hinged cover container, delivered post paid to you for the price of a single, small size tap. Order a kit today. You get one each of the following sizes: 6-32; 8-32; 10-21; 10-32 and 1/4"*-20— together with full information for using, including drill sizes for holes in metals and other materials of varying thickness. Take advantage of this offer! CAN BE USED OVER AND OVER AGAIN! You'll be amazed et the long life of Shakeproof l'apping Serews. Even ufter repeated use in materials of Sracticlly any thickness, the cutting edge retains its keen sharpness. Clip coupon and mail today with 25¢ for your kit. You'll say it’s the biggest value a quarter ever bought. SHAKEPROOF LOCK WASHERS Mail coupon with 25¢ (coin) and we'll include, with- out charge, a handy 10c ring of Shakeproof Lock Washers holding an assortment of both external and internal types. Their famous tripple-action lock holds nuts and screws absolutely tight in spite of the most severe vibration. Used by leading man- ufacturers. Now sold by hardware dealers, mill supply and auto parts Jobbers. Mail order now. SHAKEPROOF LOCK WASHER CO. Distributor ot Shakeproof Products Manufactured by Illinois Tool Works 2521 N. Keeler Ave. | PATENTED THREAD- CUTTING SLOT , U.S. Putent Nos. 1,862, 486—1,909,476—1,900,477 P COUPON SHAKEPROOF LOCK WASHER CO. 2521 N. Keeler Ave., Chicago, Ill. Enclosed find 25c (coin) for which send me complete kit of b EE 1-775 5 vde e handy [De ring of | P ————————— l Ali aana etis dees ori mass oso pe Dai seruus | [| e ————————— KL e —Ó l 122 Generator Makes Gas [Continued from page 108] manner depicted in the diagrams. Use a fifty- gallon oil drum for the large tank and another, slightly smaller, that willfit inside. To the bottom of the small tank attach an eye bolt so that it can be raised from time to time by an overhead pul- ley arrangement. The top of the small drum is cut off, as is the top of the larger one. A length of one-inch pipe is installed in the large tank as shown in the accompanying diagrams. The pipe is cut so that it projects several inches above the top of the drum. After assembling the pipe and installing it in the tank, fill it with water to within a few inches of the top. Be careful that no water is allowed to enter the pipe when doing this. Connect up the vaporizer unit and half fill it with gasoline. Connect a gas appliance to the nipple on the one-gallon tank and the gas gener- ator is about ready for operation. Opening the air inlet valve on the smaller tank raise it out of the water filled tank, close the valve and allow it to lower into the water once more. The weight of the steel drum will cause the air inside to com- press and pass down through the pipe then on to the vaporizer unit, where it mixes with the gaso- line to form an illuminating gas. The apparatus is not only an efficient gas gener- ator from the standpoint of expense, but a safe one as well. Gas generated by it is no more dan- gerous than city gas. The only attention which must be given the gas maker is the raising of the smaller drum when it drops down and adding of more gasoline from time to time. Before raising the tank always open the air inlet, closing it again after the raising operation. Let Sound Tell The Story [Continued from page 12] By tempo and musical "timing" the audience may be excited or lulled into "earical" pleasures. Musical tempo is used for speeding up the action of the cartoon story when things rapidly happen. To do this a slow musical tempo is played as a background music until the tempo or "time" is established with the audience, and then the "time" is gradually increased. This literally sucks the audience along in what the Disney artist calls a "musical vacuum." When bugs march off to battle in a pseudo serious portrayal of a march, four-four time is used, while six-eight time is used for swinging comedy marches. Two-four time is used for "background" music where there are "chases" or where music with a definite beat in which the action is gradually speeded. Three-four waltz time serves for scenes where beauty is empha- sized. Music and sound has become an exact science with Walt Disney. The music and sound effects in his cartoon psychologically tell the film story for the ears as the picture on the screen does for the eyes. Accept No Substitutes! Always Insist on the Advertised Brand!

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Sf AND NOW FOR ONE OF ¥ 8 THOSE SWELL,SMOOTH § SHAVES 1 GET WITHA B GILLETTE BLADE IN. € THE GILLETTE RAZOR B -THEY'RE THE"TOPS" B Every Shave Is oS PRODIRE when blade and razor match e TheGilletteBladeand Gillette Razor were made for each other. Both were designed as a unit by the same engi- neers. No wonder they shave you so comfortably. Buy a package of Gillette Blades. Slip one into your Gillette Razor and enjoy anew thrillinshaving! Reputable merchants never offer substitutes for Gillette Blades. Always ask for them by name. SPOKEN WISELY ! HE KNOWS WE ] WERE MADE FOR # EACH OTHER he Gillette. Razor DRIVER D925 DRILL PRESS $37.50 as shown, less motor incl. belt and motor pulley À fine drill press is one of the ideal “first tools" for any home workshop. This Driver model is stardy enough for heavy work, yet made with pre- cision that fits it for the most accurate drilling. SKF ball bearings, Jacobs Key Chuck. True running, vibration- less. A high quality engineered tool in every respect. THE DRIVER LINE! An 8"x30V5" Lathe for $16.95. A 14" Jig Saw for $12.25. A Z7" Bench Saw for $11.25. A 10" Band Saw for $19.95. A 4" Planer (Jointer) for $13.50. Other Models Available at Slightly Higher Prices All Engineered—All Rugged—4All Easy to Operate | WALKER-TURNER CO., Inc. L| | 517 South Ave., Plainfield, N. J. a [| Send me your colorful descriptive folder g " on 1937 Driver Engineered Power Tools. i ASK YOUR DEALER ABOUT Hee { THE EASY PAYMENT PLAN Name sonsssccsscassuscessenscesces [| L| a L| p a 1 Address ~-_--------.---------------- I L| LI em em oum mr mco m ONG 2400 Degrees F !! BRONZE FOUNDRY for School and Home Workshops e Complete Foundry Outfits are available in A three sizes and make It possible for you 3 to produce beautiful bronze, silver or alu- minum castings in your ome workshop. Presents such as book ends, ash trays, dishes, paper welghts, letter openers, bot- tle openers, statuary, ete., can be quickly made by the sand casting br Ocess. Exist, ing objects can be used as patterns, and sand moulds made !n a few minutes’ time. Previous experience unnecessary. Domes- tic gas supply and 110 volt 60 cycle en- ergy required for operatlon. Size Crucible Shipping .Wt. Price y Casting Camplete 351 G cv. in. 25 Mos. isl S 9.50 352 12 cu. in. 40 Ibs. Ibs 15.00 4cu,in, 65 Ibs, à Ibs. 23.50 Tor 110 volt D. eb or 25 cycles energy add $4.00, Prices f, o. b. K, C. plue 1% Missouri sales tax. Check or money order a^cepntable, express charges C, O. D. Write for circalar. KANSAS CITY SPECIALTIES CO. P. O. Box 6022 Kansas City, Mo. ELECTROPLATING MADE SIMPLE Amazingly new simple GUARANTEED way to PERMANENT- LY eleciropiate Nickel, Copper, Zine or Cadmium with a brush— As easy to apply as a coat of paint. A non-liquid process, always ready for use, quickly applied, and equal to any commercial electroplating. Used in factories, homes, home work shops, garages, stores, art studios, etc. The complete plating outfit can be carried in a pocket or tonl box and operates from dry cells, automobile battery, or battery charger. Complete outfit (less battery) $2.00. Money back guarantee. p metal wanted when ordering, or write for further in- ormation. (Patented in U. S.— Canadian patents pending) RAPID ELECTROPLATING PROCESS 2135 N. Cicero Ave., Dept. 212, Chlcago, tit. | When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 123

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Dared to Write! Furtive glances. Whispered words. Concealed remarks. Who ever would have been so foolhardy as to commit them to writing would have signed his own death warrant. What were these communi- cations which for generations could only be transmitted from mouth to ear? It was the rare wisdom of the ancients; age-old truths which tyrants and selfish rulers sought to suppress, knowledge which they ew would give man power, independence, mastery of life and the ability to attain his highest ideals. Today, these secret principles, once withheld from the masses, are available to the sincere, to you if you seek the fullness of life. SEND FOR FREE BOOK The Rosicrucians have for centuries, in distant lands, preserved this knowledge, kept it in secret archives. 'They have always made it available to men and women who sought progress in life by making the utmost of their natural talents and abilities. They offer you a free copy of “The Secret Heritage," which explains how you may receive these startling facts. Address: Scribe H. F. F. The ROSICRUCIANS [AMORC)3 San Jose California (Not a religious organization) PRINT-O-PRESS YPELESS PRINTER Professional Model. Does The WorkofEquipmentCost- Ing Up te $200—Only $7.95 Amazing new fast Rotary Uni- versal Printer. Prints letters, ad- vertising, etc. for stores, offices, factories, churches, restaurants, home work. Factory-precisione B bullt; has advanced features; does color work; portable. Sime si complete. Guaranteed. THE PROFESSIONAL PRODUCTS CORP. 124 Accept No Substitutes! ple—anyone can use it. Opens € four pie pon sources. Order irect. wu: or yours DETAILS SENT FREE Dept. 115 Silverton, Ohio Spinning Metal Projects [Continued from page 112] Another excellent wood-and-metal combina- tion is a rather deep turned dish with a lining of lead which comes up over the edge and is locked just under the lip. It is ideal for flower bulbs which can be planted in wet gravel or sand and no moisture will thus reach the wood. First turn the bowl to shape and finish the edges with sandpaper, filler and clear lacquer. Cut the lead sheet of sufficient size. Put a small wood block securely centered in the tail stock and apply a little pressure to keep it from working out of place. A drop of glue will lock the block and lead together. Turn the lead over the edge and lock it before molding the inside to shape with the dowel and candle. Another type of metal-wood ash tray is so at- tractive that it is well worth mention. It employs spinning the sheet lead as has been described and also using narrow inlays. These narrow strips of cold metal contrast nicely with the rich tones of walnut and when tooled flush with the wood surface and finished as one piece make an excel- lent project, appropriate for the living room or richly appointed office. Tiny Hand Power Grinders [Continued from page 99] of which are available. The smaller cutters have, for the most part, finer teeth and with them you ean do much more delicate work than you can with the larger, rougher cutter. After the carving has been completed figure may be colored by using india ink, water colors or lacquer. Use any color scheme that you feel suits the project. Cartoon characters in the news- papers are perfect sources of subjects for the amateur craftsmen. The figures are usually sim- ple and can be duplicated so they are easily rec- ognized without a great amount of skill. After the craftsman has done the more simple forms of carving he should be familiar enough with the peculiarities of the various work so he may undertake something of a new, ambitious nature such as the ship lamp which was carved from a solid piece of walnut using a high speed hand tool and steel cutters. You will notice the figure in the photo is being detailed with an excep- tionally small steel cutter; the type commonly known as a finishing bur. In model-making, too, the hand grinder can be used to great advantage in sanding down balsa model ship and airplane parts. The accessory used for this is known as a drum sander with an abrasive band mounted upon the drum sander. These bands are available in a wide variety of sizes and grits suitable for practically all classes of model work. They have the advantage of re- moving considerable amount of material in a rela- tively short time and leaving an excellent smooth surface without need of further work. Always Insist on the Advertised Brand!

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Women Head Winners' List [Continued from page 62] used, won third prize of $5 for Elvin M. Weidman, of East Petersburg, Pa. Women who have exper- ienced the annoyance of having ordinary clothes- pins work loose when wind tugs at the washline will appreciate Mr. Weidman's suggestion. To make horseback riding more comfortable, especially for novice horsemen, George Morris, Box 59, Elizabeth, Pa., suggests a saddle that can be inflated by a hand pump. A prize of $2 was sent to Mr. Morris for his idea. Edmund Rice, of 80 Peck St, No. Attleboro, Mass., was awarded a $2 prize for his suggestion of triangular rubber strips for window framing. Rubber frames would prevent breakage from slamming and vibration. At the same time, they would be watertight. Miss Lorraine Bradley, of 2995—18th St., Su- perior, Wisc., submitted an idea for a detachable baby carriage seat that won a $2 prize. The seat would enable a mother to provide transportation for both a baby in the carriage and for a toddling youngster on the seat which would be attached between the carriage handlebars. Prizes of $1 each were awarded to the following readers for their suggestions: David Suimont, Biwabik, Minn. Charles P. Cessna, 234 Market St, Johnstown, Pa.; Ray Preski, 881 Nebraska Ave., Toledo, Ohio, and Jerry Ball, 2405 Cranshaw Blvd., Los Angeles, Calif. If you have any good ideas for needed inven- tions, send them to the Needed Inventions Con- test Editor. If they are practical and have not already been patented by someone, you may win one of the ten cash prizes that are awarded by the contest judges each month. Here are the con- test rules: 1. In 100 words or less explain your idea for a needed invention. 2. This contest is open to everyone except em- ployees of Modern Mechanix Publishing Co. 3. You don’t have to buy a copy of the magazine or be a subscriber to enter. 4. Write your name and address plainly on your entry. No entries will be returned. 5. The editors of this magazine will be the judges. All decisions will be final. 6. Mail your entry to Inventions Contest Editor, Modern Mechanix Publishing Co., Greenwich, Conn. Entries arriving too late for next month's contest will be considered for the following month. Newest Auto Race Track [Continued from page 65] rail. At the most dangerous curves, low concrete walls supplement the rails. A photo-electric cell master clock at the timer’s booth and 28 separate clocks, with two men at each clock, insure utmost precision in timing the competing cars. A series of powerful 20,000- watt amplifiers carry news of the race from the announcer's booth atop a 145-foot observation tower. Racing cars are submitted to an exhaustive test before the race starts to eliminate possible accidents due to defective brakes, ignition, car- buretion, etc. The administration building houses equipment for making these tests. When Answering Advertisement; Please Mention January Modern Mechanix Hobbies and Inventions MEN WHO WANT TO GET MARRIEDI Mosr likely your income has been reduced. And yet — You and that girl of your dreams have the precious hope of facing life together! f The obstacle is money — more money. Listen: Thousands of men, even in these times—men who faced the same problem that now troubles you—have learned the secret, "They're making themselves more valuable on thelr present jobs, preparing themselves for the bigger opportunities aheadl They’re doing it by devoting a portion of their spare time to study—by mastering International Correspondence Schools Courses that are modern and practical in their training. Many of today's business leaders started this very way. You ean do the same thing—and realize that hope you hold so dear. It takes work and sacrifice—what worth-whlie thing doesn’t? The coupon will bring you good news—mail it today! INATIONAL CORRESPONDENCE SCHOOLS. Box 2321.K, Scranton, Penna. Without obligation, please send full particulars about the subject before which I have marked X: TECHNICAL AND INDUSTRIAL COURSES O Architect O Diesel Engines D Architectural Draftsman O Aviation Eng. O Auto Mechanio O Building Estimating O Plumbing D Heating O Contractor and Builder D) Air Conditioning O Refrigeration O Structural Draftsman O Steam Engineer O Structural Engineer O Steam Electric Engineer D Electrical Engineer D Marine Engineer O Electric Lighting D Civil Engineer O Highway Engineer O Welding, Electric and Gas O Bridge Engineer O Reading Shop Blueprints O Bridge and Building Foreman O Telegraph Engineer O Surveying and Mapping O Telephone Work D Radio OR. It. Locomotives D Air Brakes O Mechanical Engineer Lj R. It. Section Foreman D Mechanical Draftsinan OR. R. Signulmen O Machinist O Toolmaker O Chemistry O Patcernmaker O Foundry Practice O Sheet Metal Worker D Boilermaker O Pharmacy O Coal Mining O Navigation D Cotton Manufacturing D Woolen Manufacturing D Heat Treatment of Metals O Agriculture D Fruit Growing O Management of Inventions O Poultry Farming BUSINESS TRAINING COURSES O Business Management O Lettering Show Cards D Signa O Industrial Management D Stenography and Typing O Traffic Management D Civil Service O Mail Carries D C.P. Accountancy O Railway Mail Clerk O Bookkeeping O Grade School Subjects O Secretarial Work D High School Subjects O Cost Accountant O College Preparatory O Salesmanship D Advertising O Firat Year College Subjects O Service Station Sulesinanship O Illustrating Spanish O Business Correspondence L] Cartooning O French DOMESTIC SCIENCE COURSES O Millinery. D) Foods and Cookery Tea Room and Cafeteria Management, Catering O Professionel Dreasmaking and Designing O Home Dressmaking B O Advanced Dressinuking Name.... HC MQT UU ——— — If you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Moutrcal, Canada 125

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U S M f t fesire men to learn pee ric Arc Welding and ge Li s anuracturers practical experience under actual production conditions in the laboratories of the School of Engineering. Moderate training Fee. Accepted applicants will be fully trained until ready to pass rigid test and assisted in securing employment. presents one of the outstanding op- portunities for steady income and future success, Welding is growing rapidly, replacing large and intricate castings, rivets, nuts, bolts, screws. Arc Weldi rc Welding . . E n g inee rin g It is commonly used in assemblin; anes, hoists, bridges, structura er Steel work, etc. No limit to the application of welding to indus- try, increasing durability and reducing manufacturing costs. There is a decided shortage of properly trained Welding Operators, Technicians and Welding En meer Why be content with ordinary work, hit and miss jobs and iow pay when in a short time you can become a trained Specialist in Welding? Vere MI LWA U K E Ee ACHAL of ENGINEERING P Jnatitute of Electratechnics MM-137, Broadway and E. State, Milwaukee, Wis. Without obligation send Free Booklet ‘The Dawn of a Gigantic Industry and its Outstanding Opportunities.” Also tell me how to become a Welding Operator (3 mo.).... Welding Technician (6 mo.).- Welding Engineer (1 yr.).-..- Electrical Engineer B. S. Degree (4 yrs.) . Student Loan Plan. Refrigeration and Air Condi- tioning Techhician (8 mo.)....- Radio and Television Service Man (6 mo.)_...~..---— Commercial Radio Engineer (1 yr.) Earn Part Expense Plan. SPORTSMEN'S MANUAL Packed with articles that make hunting, fishing, and camping trips more enjoyable and successful. MODERN MECHANIX PUBLISHING CO. Fawcett Bldg. Greenwich, Conn. GAS MOTORS Rtiady-to-Run J The thrilt of a l!fetlme is yours this Xmas with a G. H. Q. super- power gas engine—actually one of the most powerful motors ever con- structed! Never in the history of gas engines was a motor ever of- fered at so low a price. All Amer- ica has aeclaimed this englneering triumph—accomplished by outstanding G. H. Q. designers and engineers after scientific, acrody- Has Broken records for zing performance. ies model planes up to Yo mn wing spread. Also used for boats. And look at all these extra features! Easy starting—just a twist of the wrist. Steady running—runs 27 i minutes on ounce of gas, Precision, replaceable parts. F Cylinder and Piston Lapped. Longest crank shatt ever made on minia- ture motor. Chrome nickel Steel shaft with 11%” bear- ing surface. Connecting rod of high speed bronze. t power at 3000 to 7000 R.P.M. This famous motor complete, en- firely assembled on a stand. Tested and run before shipment—pcrformance uarantecd. No oil, gas or batteries cluded, Only $12.50. FREE—one 2 fnished fly-wheel mounted on motor. i: (This offer not for dealers). Send 3c for illustrated catalogue including information on gas accessories. G. H. Q. MODEL AIRPLANE CO. 854-A East 149th St. New York, N. Y. 126 3i years of exhaustive, namic research, 1% horse Accept No Substitutes! "Jumping Jeff"—Tots' Toy [Continued from page 97] and eut out the spokes. Saw out of 15" stock two circles and bevel the edge to clamp around the rim of the tire. This may be quickly done on the lathe. Now screw these discs together on either side of the rim and a disc wheel results. Drill through the center of these pieces with a 5%” drill, drive into this hole a piece of 3g” pipe and assem- ble the wheel. The mechanism which moves the head is simple to make with all details shown in the picture dia- grams. When finished and adjusted to work smoothly paint the toy in brilliant pleasing enamels. The toy makes a Christmas gift that will provide the smaller child with hours of healthful outdoor fun. Completing The Mayflower [Continued from page 107] about 214 inches from the end of the bowsprit. The top-mast stay goes up between the cross irees, around the mast with an eye and down to the fore mast head with its lower deadeye directly under the cap. In the lower end of the fore top mast stay, there is a block, another block about one inch from the end of the bowsprit and the light hauling rope is seized to the end of the bow- sprit and reeves through these down to the be- laying pin on the foreward forecastle pin rail. The mizzen stay goes with an eye around the mast directly above the cross trees with a lanyard at its lower end fastened with a loop under the wedge cleat at the foot of the main mast. Now prepare the yards and parrels in readiness for hoisting and rigging the sails. The first thing to do is to cut and sew the sails. Cut them large enough to allow for the hem all around. Sew into the hem, medium cord, and be careful to form little loops at each corner. For material for the sails use balloon cloth which can be purchased from ship model supply houses or use a linen that has a canvas texture. Before you cut it, however, sew vertical rows of stitching % inch apart, taking pains to get them parallel. The edges of the sails are curved. The main and foresail carry bonnets or small foot sails. These are fastened to the larger sails with a marline hitch. With a little study on the sail plan, you will note that the fore and main sail are rigged very similar. Start rig- ging the main by lashing two medium sized blocks ($&") about 34” on each side of the center line of the main yard. One inch further out from these, lash smaller blocks (1/18") which will sheave the clewline. Now make brace pendants of medium cord 2" long with a large block in one end and an eye in the other. This eye goes over the end of the yard. Lash together a small and medium block and secure them at the top position at each yard-arm. The medium block runs the top sail sheet and the small block, the main yard lift. Secure small Always Insist on the Advertised Brand!

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blocks under the crosstrees for running the lift- cords. When this is done, reeve a two foot length of medium cord through the single hole in the iye block, bring the two ends of the cord up through the holes in the cheeks and hitch the ends to the center of the yard so that the tye block will hang almost an inch above the top of the knight- head when the main yard is raised and draw a lanyard through these in the following manner: Secure a piece of fine cord to the staple at the foot of the knight, bring it through the first hole in the tye block then through the corresponding hole in the knight and so on until the lanyard is reeved. Belay the free end to the knight head around the lanyard. You will now need a parrel to retain the yard to the mast. Construct this from three 14” strips of wood drilled with three holes each. Use light cord for the lifts. Secure this cord under the crosstrees, draw the ends through the small block at the yard arm, back up through the block under the crosstrees, then to the deck and belay to the cleat marked B aft of the deck guns. The main braces start at the taffrail and reeve through the pendant block, then back to the block lashed to the taffrail and belays to cleat C on the poop deck. Now for the sheet line—pass a short stick (toggle) through the loops at the lower cor- ners of the sail and lash a large block to it for the sheet and above this a small block for the clew garnet leads. Start the sheet of medium cord at the ringbolt on the third wale, pass it through the large block just mentioned, back to the block forward of the ringbolt, then through the hole in the bulwarks just aft of the main shrouds, and belay to one of the large cleats D just aft of the two-sacker guns on the main deck. "The tacks are the next in line. Use a single rope of medium cord. They are secured to the toggle stick and reeve through a hole in the chesstrees, then through a hole in the bulwarks, and belay back to cleat H inside the main bulwarks. The bowlines are crowsfoot at the leaches, rigged with bull's-eyes and go directly forward to cleat E on the forecastle deck. Clewlines of L cord start at the quarter at the yard next to the clewline blocks on the yard, go down to the small clew blocks at the lower corners of the sail, up through the blocks at the quarter yard and belay down to cleat F at the foot of the mast. Use light cord for the buntlines which are tied to the foot of the sail and go up on the lee (forward) side and reeve through blocks at the cheeks and belay to U bolts or cleat at G near the foot of the mast. In making the flag, it can be painted upon white silk with textile or oil colors. If using oil colors, be sure to use just the right consistency to keep the color from running. On the fore topmast, there is the flag of St. George's cross. On the main topmast we have the red cross of St. George superimposed on the white cross of Saint Andrew on a dark blue field. With the installation of the flag the Mayflower model is completed. Placed in the neat plywood cradle, it makes a beautiful home decoration. When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions Learn to Earn More | Money Every Week f Whether your age is 16 or 40. Let us train you to prepare for | —or Go Into Your | positions that lead to good Í Own Business salaries in Electricity — NOT ———— ; by correspondence, but by an amazing modern method right here in the great Coyne Shops that gives you a practical Train- ing in 90 days! Getting into Electricity is easier than you imagine if you choose the right method. You don't need previous experience or need a lot of book learning. Start any time after you have enrolled. Easy Payment Plan Mail the coupon below and I'll send you all details of my -monthly tuition plan. Under this plan you can get your training first and then pay for your tuition later in small monthly payments extending over an 18-month period, starting 5 months after you start school. LEARN BY DOING —IN 90 DAYS IN THE GREAT COYNE SHOPS I don't care if you don't know an armature from an air brake — I don't expect you to! We give you 12 weeks of practical Shop work in the Big Coyne Shops. . . . Practical work on real Electrical equipment. MANY EARN WHILE LEARNING If you need part time work to help pay your expenses we may be able to help you if you will write and tell us your problems. When you graduate you can £et lifetime employment service. DIESEL, REFRIGERATION AND AIR CONDITIONING Right now we are including instruction in Diesel Engines, Electric Refrigeration and Air Conditioning without extra cost so your training will be more valuable to you. Coyne is your GET MY BIG FREE BOOK! great chance to get into Electricity. This school is 37 years old—Coyne training is reliable. You can find out everything absolutely free. Simply mail the coupon and let us send you the big, free Coyne book with photographs -.facts...0) portunities. Tells you how many earn expenses while training and how we assist our graduates in the field. DU LES at $ " as H.C, Rua | COYNE ELECTRICAL SCHOOL £00 5, PAULINA ST., Dept, 17-53, CHICAGO. ILE, SEND NOW FOR FULL DETAILS! | H. C. LEWIS, President, COYNE ELECTRICAL SCHOOL 500 S. Paulina St., Dept, 17-53, Chicago, llli. Dear Mr. Lewis: Withou: obligation send me youn big, free | catalog with facts about Covne Training and details ot your Monthly Tuition Payment Plan. + Name... ee eeeeoesevessoovsoccoosscevesoseooseoseosoooe I Address, e eee es oes o ooo ooo | [coo —————— »State. ecce eere Mail in envelope or paste on a postcard acini

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my OWN Business. L. A. Eagles took in $200 his first week. Harry Hill says: “Paid for home with Rug- Washer. Earned $86 first day." Fred Paulson says, “Made $99 in 1014 hours.” Many others make $125 to $200 per week. Thousands earning quick, easy profits, Ejectricity does the work. Finishes rugs like new, on customer's floor. Hundreds of cus- tomers in your vicinity and nearby towns. EASY TERMS Inexpensive equipment. Pay part down— balance monthly. No shop necessary. Used by the United States Government and Statler Hotel System. Manufactured since 1918—every machine guar- anteed. FREE BOOK Send today (no obligation) for booklet illus- trating Rug-Washer and telling how you can earn large profits at prices below other methods; how you can build fh VON SCHRADER MFG. CO. 201 PI., Racine, Wis. Own a CHEEZE-KIST Popcorn Route Big Profits Manufacturing And Selling At Wholesale Imagine fresh, crisp popcorn coated with golden yellow liquid cheese. That's CHEEZE-KIST—the newest food sensation that is sweeping the country. We furnish outfit that makes as much as $230.40 worth of CHEEZE-KIST in a day—MOSTLY ALL PROFIT. Make it in your own home and sell your entire output at wholesale to stores, taverns, road- houses, cigar stands, restaurants, etc. STARTLING PROFITS. Cash comes in first day. perience needed. New Low Price Opens Field For Ordinary Man Complete manufacturing equipment fur- nished at price so unbelevably low that even the man of most limited means can start. Everything supplied, including formula, manufacturing and selling instruc- tions. Operation made as simple aa A-B-C. Raw material plentiful and cheap. We Trust You Equipment shipped on credit to honest, de- serving persons. All particulars furnished FREE. Simply send name today and get all the facts. CHEEZE-KIST COMPANY 142 High St., Springtield, Ohto No previous ex- Bethlehem Opens New Plant [Continued from page 86] of rollers, that squeeze it thinner, wider and much longer, is one of the best spectacles of modern in- dustry. Clouds of steam arise from the cooling water sprays on the rolls, electric switches click, and the long, radiant carpet of metal rushes down a path of smooth-running rollers to be coiled automatically like so much adding machine tape. Behind this rapid metamorphosis of crude steel into sheets for automobiles, refrigerators, furni- ture, and a hundred other products, is precise electrical control. The modern rolling mill would be impossible without the flexibility and respon- siveness of motors, thousands of them, mounted upon the machines. In a lofty central room— "pulpit" to steel men—where he may survey the whirling mill below, is the god of the machine, the operator, playing with skillful mind and fingers on the bank of switches that are masters of the wheels below. But do not imagine the human element is en- tirely Jacking. Automatic as the machine appears in its smooth operation, constant manual ad- justment is necessary in order that the strip may flow out smoothly. And man had tc make the machine. Priest Maps Hoof of World [Continued from page 83] Besides discovering the fossil glacier on his 1936 expedition, the Glacier Priest exploded the theory that dinosaurs roamed the Alaskan region in the Jurassic period. Father Hub- bard located the only Taku Indian alive who had seen the giant fossil tracks in North British Cc- lumbia. On his way to meet the Indian and find the fabled tracks, Father Hubbard and his companion, Ken Chisholm, former football star of Santa Clara University, had to leap to safety on the rocks as their heavy-laden 30-foot Allegheny metal boat was capsized in the swirling ice floes of Twin Glacier River. Receiving the priest’s blessing, Chisholm swam to shore to get aid. After Father Hubbard had been on the rock several hours, Mary Joyce, famous girl dog musher, sighted him from her motorboat and rescued him. When he finally saw the fossil tracks, he ascer- tained they were only bear tracks and only 200 years old. They were 17 inches long and nine inches wide. Five years ago the Glacier Priest took the first photographs of belching Aniakchak volcano, which has the largest crater in the world. The next year the daring aviator Dorbrandt flew him over it. In 1934 he astonished the world by landing in a seaplane on a lake within the crater. But the Glacier Priest thinks his daring deeds pale beside his discovery of free chlorine gas. He trapped and bottled some which is now in the Carnegie Physical Laboratory at Pittsburgh. Accept No Substitutes! Always Insist on the Advertised Brand!

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He thinks this may explain the mysteries of death of people near Mount Katmai when it erupted some years ago and produced the Valley of Ten Thousand Smokes, which the Glacier Priest ex- plored. Including the Glacier Priest, the exploration party consisted of five men and four dogs. Each man carried a pack of 100 pounds and each dog transported 50. Other party members were Edgar Levin, graduate student at Stanford University; George Getty, youthful Oregon geologist, Cavalier and Chisholm. The expedition was joined in Alaska by John Dimond, 16, son of one of Alaska's Delegates to Congress, who was badly burned when one of the party's fishing boats caught fire. Other casualties of the trip included two broken ribs and some torn muscles suffered when Ed Levin tumbled headfirst into a 50-foot crevasse. And Father Hubbard himself sliced off the top of a knuckle, and blood poisoning set in. Against these haphazards, however, the Glacier Priest thinks his successes were well worth all the dangers, privations and sufferings. As a result of his adventurous summers in the North, Father Hubbard says he has sufficient evi- dence to prove that the desolate waste of the Alaskan Peninsula is the cradle of most of North America's violent windstorms. How hot is the lava that gathers on the outside of an active volcano cone? While climbing up one of the smaller volcanoes the explorers were almost blown off by a 100-mile-an-hour gale. Ironically enough, the heat of the lava beneath their feet almost burned their shoes off, while their bodies were well nigh frozen. No wonder their shoes were scorched! The Glacier Priest's ther- mometer told him that less than 10 inches under the surface of the volcano's swollen sides, were temperatures of over 400 degrees Centigrade. Throughout the Aleutian Islands the explorer has been gathering evidence of a large aboriginal population, in an advanced stage of culture. He believes this island chain was one of the ancient roads by which man first came into North America, although the main route, he points out, was by the Bering Sea. In keeping with this theory, he says, the people of Attu and Agattu Islands, the farthest eastward of the Aleutians, speak a strange language which seems to have some relationship to the speech of the hairy Ainu, the aboriginals of Northern Japan. This may constitute proof of an entirely indepen- dent invasion from Asia. Father Hubbard also points out the existence throughout the Aleutians, of a strange sort of Rock carving which can be traced from Central Siberia, through Alaska and down the Pacific Coast to Mexico. This appears to mark the pas- sage of some aboriginzl people who had reached a fairly advanced state of culture. The Glacier Priest now hopes within a year or so to uncover corroborative evidence of the mi- gration of Asiatics many long years ago to North America. [GEE...Id sure like to ave real HE-MAN muscles ! So would 1, but it takes a long while s Charles Atlas "on er of title, “World's Most Per: 7 fectiy Developed won in Na- Panal and Internas tional contests. TU Prove in thefirst Tdays YOU can have a l Body like Mine!" Don't get the idea that it takes a Jot of time and hard work for you to get smashing strength and powerful muscles! Don’t think you need dumb- bells, springs or other contraptions! Both these ideas are all bunk—and I have PROVED it. All I need is 7 days to prove what I can do for youl And I don’t need any apparatus either, In fact, I don’t believe in artificial methods that may strain your vital organs for life! NATURAL Methods Are All I Need Here you see an actual photo of how I look today. No muscles have been ‘‘painted on." This is the camera’s honest proof of what J did for MY body. Now I'm ready to prove what my secret of Dynamic Tension can do for YOURS! A few years ago T was a physical wreck, a 97-pound weakling—flat chested, arms and legs like pipestems. I was worried I studled myself. Then I found a new way to build myself up. A way lhat was simple, natural, quick and sure! “Dynamic Tension’ is what I called it. In a short time I had the body that has twice won the title of ‘‘The World's Most Perfectly Developed Man." Get My FREE Book Thousands of others now know from thelr own Personal experience what Dynamic Ten- sion has done for them. This little coupon brings you my free book, which tells all about it. No cost or obligation. I just want to give you proof that I can do for you what I have done for so many others; pive you broad, powerful shoulders, biceps hat bulge with smashing strength, a chest which stands out solid and muscular, and an evenly developed body ihat will make others look like dwarfs next to you. Mail this coupon TODAY! CHARLES ATLAS, Dept. 6N, 11 23rd St., New York, N. Y. BE UB UD ED RS 24 zm 3-4 UND MD ND CUN UA SSeS CHARLES ATLAS, Dent. 6N, 115 East 23rd Street, New York, N. Y. I want the proof that your system of Dynamie Tension wil! make a New Man of me—give me a healthy, husky body and big muscle devel- THIS STERLING SILVER CUP BEING GIVEN AWAY This valuable sup stands about inches high on a black mahogany base. I will award it to my pupil who makes the most improvement in his development within the next three months. opment, Send me your free book, “Everlasting Health and Strength.” NAMO OPTED T . (Please print or write plainig) ” Address ............ tasas T tees. Uy pase ctecnintawin win stasataleiaraintorsie'esoreisiwiere te eoeccecce Mtate serrer s... When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 129

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REE-i: you act now—Kushlan's HANDBOOK OF INDUSTRIAL ELECTRICITY i Regular McGraw-Hill 500-page with thè manual of practical information for those engage n electrical con- Croft Library struction, maintenance, testing, in- P specion pna contracting. i ours without charge on receipt of your o£ Practical first payment for tne Croft Library. The Croft Library Is a complete ELECTR! CITY electrical educator. It is founded on practice—on 20 years of shirt- sleeve experlence—on work as it is actually done. It is jammed from cover to cover with the kind of hard-hcaded facts you want. Written so that ihe beginner can easily understand iL, yet so sound, so thorough that It is the daily guide of 59,000 highly paid electrical workers and engineers. Croft telis you the things you need to know about motors, enerators, armatures, commutators, transformers’ circuits, switch- oards, distribution systems—electrical machinery of every type— wiring for light and power—wiring of finished buildings—underwriters’ and municipal requirements-illuminntion in its every phase—the most improved methods of llghting—lamps and lamp effects, etc.—how to do a complete job, from estimating it, to completion. No money down-easy payments Fill In and mail the coupon attached and we wlll send you the entire set of seven volumes for ten days’ Free Examination. e take all the risk—you assume no obligation. If you decide to keep the books, send $1.50 m 10 days and the balance at the rate of $2.00 a month and get Kushlan's useful Handbook free, in addition. Row and see the books for yourself. FREE EXAMINATION COUPON McGRA W-HILL BOOK CO., 330 W. 42nd St., New York Send me for ten days’ free examination the Croft Library of Practical Electricity. f eatisfactory Y will send you $1.50 In 10 days and $2.00 monthly until the price of $19.50 Is pald. If not wanted, I will return the books postpaid. Upon recelpt of my first payment of $1.50 you are to send me a copy of Kushlan's Handbook of Industrial Electriclty, absolutely free. Name Home Address City and State Position .-...------ Send the coupon Name of Company. There Are Many Degrees Of PATENT PROTECTION You want to make money from your invention, therefore, you want the best patent you can possibly get. But a good Patent depends not only on the invention itself, but upon the skill and interest of your patent attorney in deawing up the claims and specifications and in following your case 10 a successful conclusion. C. A. Snow and Company have had over 61 years of specialized patent experience. We know the diference between strong patents and weak ones. We won't promise you something we can't get for you. ‘Write today for our free document: "CERTIFICATION OF INVENTION" and our two [ree booklets: "HOW WE PROTECT YOU" aad "SUGGESTIONS ON HOW TO COMMERCIALIZE YOUR INVENTION", Fill out the coupon below NOW. - e «e Cut Coupon On Doticd Linee e a sm umm m more DEPT. C-13 - SNOW BUILDING, WASHINGTON, D. C. Gentlemen: Please send me absolutely free and without obligation en my part, your orig« ênal document, “Certification of Invention", together with your two guides for inventors, “How We Protect You" and "Suggestions On How To Commercialize Your Invention.” NAME. (PLEASE PRINT NAME CLEARLY) 130 Accept No Substitutes! Christmas Circus For Kiddies [Continued from page 101] horses can be of various markings, but- each team should be matched. Assembly of the wagon is clearly shown. The smaller front wheels are made to turn on a screw in the manner shown. Four to eight teams can be hooked up on each wagon and any youngster will thrill to hitch up long strings of them for a parade. A trick elephant to go with the circus can be made to assume all sorts of comical attitudes. Three-quarter-inch white pine is used for the body with a jointed trunk, and legs secured with rubber bands. The performing horse, clown, monkey as well as camel, lion and giraffe should be mounted on a wood base so that they will stang. up. Paint circus toys in bright enamels. ANSWERS TO MM MEMORY TESTERS (Questions on page 54) Rectifiers convert pulsating alternating current into direct current. The most common types of rectifiers are used in radio receiving sets. Air can be weighed with any sensitive labora- tery balance. A liter of air weighs about 1.293 grams, A hydraulic ram [s used to pump water higher than its source without the use of external power. It has one disadvantage and that is ihe amount of water it wastes. There are two kinds of energy, Potential and Kinetic. Energy which a body has by virtue is known as Potential. Energy produced by the motion of a body is Kinetic. Gold and silver, when cast, shrink upon cooling. If coins were made in this manner they would vary in size. Stamped coins are always uni- form and can be made more quickly, too. Sound travels comparatively slow through air. This can be demonstrated by the fact that steam issuing from the whistle of a distant locomotive is seen several seconds before the actual sound is heard. Sound transmitted by wire travels at the rate of approximately 150,000 miles per sec- ond, A Centrifuge is a machine used to separate liquids having unequal densities. A cream sepa- rator might be classified as such, although the “Centrifuge is a laboratory device. The Wheatstone Bride is an instrument which determines the value of an unknown resistance. Breaks in long distance phone lines are located with this instrument, Only iron and steel and their immediate alloys can be magnetized. All other metals are non- magnetic. The air surrounding a "vacuum" cup holds it fast to the object since the air between the cup and surface has been evacuated. Actually there is no vacuum involved; the real pressure is on the outside of the cup, not the inside. Copper will expand considerably more than any other common metal, In expansion aluminum is next. Water or any other liquid with a similar specific gravity can be cooled to below the freezing point without solidification. The process is known as super-cooling and must be done without jarring the Iquid. If shaken after being super-cooled the water will freeze instantaneously. Always Insist on the Advertised Brand!

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F REE: This Outdoors Sheath Knife Ideal for hunting, fishing and camping trips. It has a sturdy 4" blade. tempcred and polished, with keen, durable cutting edge. Blade extends elear thru the bone stag handle. Complete with leather sheath. OUTDOORS 1s a monthly maguzine you will enioy. Filed with illustrated stories and information on hunting, fishing, camping and outdoor activities. Also up- 5 B to-Lhe-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, Ave., Chicago, Ill. BUILD IT YOURSELF JIM DANDY CABIN CRUISER The Trailer that has Everything With my plans you can build this beautiful coach with ease and save money, Plans show every detail of building body, chassie, beds, cabl- nets, drawers, refrigerator, top, electric light and watersyetemeand where io buy all parts, The Jim Dandy Cabin Craleer can be bullt in any size to accommodate 2 to 4 people. Send $1.00 for these plans today—gat started now! Box 125-C, Wausau, Wis. MAIL DOLLAR BILL TO JIM DANDY, AGENTS 500% PROFIT GENUINE GOLD LEAF LETTERS Guaranteed to never tarnish. Anyone can put them on stores and office windows. Enormous demand, large profits. Paul Clark says: smallest day $28.70. R. L. Reel made $920 in two months. Write today for free sample and liberal offer to general agents. METALLIC LETTER CO., 426-A N. Clark St., Chicago RADIO ENGINEERING RCA Institutes offer an intensive course of high standard embracing all phases of Radio. Practi- cal training with modern equipment at New York and Chicago schools. Also specialized courses and Home Study Courses under “No obligation” plan, Catalogue Dept. MM-37. RCA INSTITUTES, Inc. 75 Varick St, New York, | 1154 Merchandise Mart, Chicago Recognized Standard in Radio Instruction Since 1909. Railway Mail Clerk POSTMASTER P. O. Laborer Elevator Conductor R. F. D. Carrier ) Auditor Special Agent. ( ) Stenographer Customs Inspector ( ) U. S. Border Patrol City Mail Carrier — ( ) Telephone Opr., P. Ò, Clerk ( ) Watchman Stock Clerk . i ) Meat Inspector Spec. Investigator ( ) Secret Service Opr. Typist ( ) File Clerk 8 INSTRUCTION SERVICE, Dept. 233, St. Louls, Mo. end me FREE particulars “Iow to Qualify for Government Positions" marked “X. Salaries, locations, opportunities, etc. ALL SENT FREE. When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions NOW—A Genuine 7-Inch BLACK & DECKER ELECTRIC SANDER J. No. 17 JUNIOR THE NEW 7-INCH JUNIOR SANDER saves hours of slow, hard work with sandpaper, emery, files, etc. Makes quick work of such jobs as cleaning and smoothing wood or metal surfaces; removing paint and rust; grinding and smoothing welds and casting ridges; rubbing down new lacquer with felt rubbing pad; polishing metal, etc. Uni- versal motor operates on A, C. or D. C. A great tool. A Great value. Only $39.50. LOW PRICED B & D DRILLS, TOO %-INCH JUNIOR DRILL: (Illustrated). Drives twist drills for drilling up to !5" holes in steel; augers for Ms driling up to 1" holes in wood. Also drives Black & Decker Hole Saws for cut- ting clean, round holes from 54" to 35" diameter in any material a hacksaw will cut. Universal motor.Only$35.00. | -INCH JUNIOR DRILL: Drives twist drills for dril- ling up to 4" holes in metal; augers for drilling up to 1” holes in wood. Also drives light wheels for grinding, buffing, polishing, etc. Uni- versal Motor. ONLY $19.50. MAIL THE COUPON TODAY for Black & Decker Catalog and name of nearest dealer where you can see these and other Black & Decker tools. BLACK & DECKER World’s Largest Manufacturer of PORTABLE ELECTRIC TOOLS _ MAIL FOR FREE CATAL THE BLACK & DECKER MFG. CO., 701 Pennsylvania Ave., Towson, Md. Please send Free Catalog showing Junior Sander, Drills and other tools, and address of nearest B & D Dealer. WV a risen se xellberce eects eet ade de ends l [o PET RR P CI FEE ges] ( 63 | PP — en State. aus |

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AmazınG New ELECTRIC HOOK UP TO ANY BATTERY! Just invented! Amazing new Comet ELECTRIC ARC WELDER—hooks up to any storage battery—generates / tremendous heat to weld all metals, PRICE, ONLY $1.05. complete. Re- pairs fenders, auto bodles. galvan- ized cans, radlators, castings, ma- chinery parts, etc. Fuses broken parts permanently, stronger than efore. Low power consumption, Take the Comet anywhere to the job, operate from auto oig Sturdily bullt of finest materials last years. FULLY GUARANTEED BY HIG MANUFACTURER. SEND NO MONEY ! You'll find a thousand uses for the Comet around your home, garage, and work shop. Thousands of garages need the Comet Welder. Also factories, repair shops, mechanics, farmers, Inventors, tin shops, plumbers, etc. Order a Comet now. Send no money. Welll rush one to you, complete with rods. Pay postman only $1.95 plus few cents postage. f not delighted, return Comet in 5 days from receipt and money you pald for it will be refunded instantly. Rush your order NOW. COMET WELDERS, Dept, P-1. CINCINNATI, OHIO EVEN with *'trade in” allowance on old radio you E CAN'T save 1/2 AT STORES. BUY DIRECT FROM FACTORY. Save 1/5 on 31 FULLY GUARANTEED Miniature, Console, Automo- bile models. AC-DC Superhet and Battery Sets. 2 and 3 tuning bands. 4 to B tubes, Automatic Volume and Tone Control. Ii- Juminsted Airplane dials. Modernistic lines. Foreign, U. S. re- ception. F R E E! FHlustrated folder. Factory price list. JUST = TIME FOR XMAS DELIVERY. SEND QUICK TODAY. CAPITOL RADIO CO., Dept. A-1, 43 E. Ohio St., Chicago, ill. U.S.A. 1937 improvements give greater horsepower, longer life, increased mileage. Send for catalog on new models. The classiest motoreycles you ever saw. Color options at no extra cost. Write today. HARLEY-DAVIDSON MOTOR CO. . Dept. MM Milwaukee, Wis. HARLEY-DAVIDSON' Motorcycles MAKE MONEY IN YOUR WORKSHOP Build furniture, auto trailers, canoes, iceboats, cruisers, sailboats and electric refrigerators described in FREE BLUEPRINT BOOKLET MODERN MECHANIX PUBLISHING CO. GREENWICH, CONN. |. THE LIFELONG GIFT A WOLLENSAK MICROSCOPE. Give him a gift that will open the door to 425 Nature's endless wonders. A Wollensak Micro- Power scope lasts forever, unless abused. Defines Only minute details clearly, sharply—the scientific test of fine quality. Magnifies 425 diameters— and only $18.50. Greatest magnification on the market at anywhere near that price. Others:—150 diameters, $12.50; 100 dt- ameters, $5.00. At stores or direct, post- paid (or C.O.D.), under money-back guarantee. Literature free. WOLLENSAK OPTICAL CO. 621 Hudson Ave. Rochester, N., Y. WOLLENSAK 132 MICROSCOPE ELESCOPES RIFLESCOPES e BINOCULARS Utility Amplifiers [Continued from page 91] receiver or other radio device. The two-tube DX-ER which appeared in last month’s MM can be powered with this amplifier. Since the pictorial diagrams show the exact locations of all parts and their proper connections little detail on the wiring is necessary. All resis- tances are of the carbon pigtail type and are rated at one watt. The fixed condensers are of the tubu- lar type except for the two .002 mfd. units which. are small mica condensers. The electrolytic con- denser in the power supply consists of a 8 and 16 mfd. unit in one case with a single negative lead for both. Power transformer is a midget type with a 300 volt, center-tapped plate winding, and two fila- ment winding; one a 6 volt and the other a 5 volt. The dynamic speaker field winding serves as the filter choke in the power supply. The speaker is a midget dynamic type and attaches to the ampli- fier through a 4-prong plug. Ordinary tube sockets are used for both the speaker plug con- nection and the external power supply cable. The complete amplifier can be built for less than $9.00 including tubes. It is attached to a battery operated receiver by connecting a 50,000 ohm car- bon resistance across headphone terminals and connecting input of the amplifier to the B minus and plate prong of cutput tube on the receiver. Extend Holiday Greetings [Continued from page 95] of this drive wheel, as diagrams indicate, moves in the 4” slot cut in the lever to give it a right to left motion which is transmitted to the reindeer through a stiff wire to give them a galloping motion. Santa in the sleigh is mounted rigidly against the back- ground by three bolts and spools. Black ribbons are glued in place to represent reins and traces. The display is driven by an electric motor located on the ground and con- nected with a speed reducing unit. Another attractive decoration is a modernistic Christmas tree. This is formed of four step-like stringers mounted on a 3 foot square base. The tread cuts in these stringers are 33$" and the riser cuts 9 inches. These risers are beveled along the edge to a 45 degree angle to provide a flat surface to which the 14” pressed wood covering is secured with brads. Construct the base of 1"x6" material brace, and cover with 14” pressed wood. The truck of 1"x6" material is 8” square and 10” high, and is nailed to the base and tree. One inch holes bored in the treads and 2” holes bored in the bottom of the tree section are backed up with colored Cello- phane or flood light gelatin and lighted from within the tree by means of four 50 watt and one 100 watt lights as shown. The tree and base are painted gray and the quarter and half round mold trim is painted vermilion, The tree may he covered with clear Cellophane to provide a glisten» ing reflecting surface for the colored lights within. Another Christmas tree in the modern manner may be constructed from an empty 20-gallon, cone topped, jacket can from which the wood covering has been removed. After cutting the sides to form six wedge shaped segments fit the spout over a wooden plug screwed to the wood base. | A ten foot two-by-four cross forms the frame for a giant star which makes a simple yet effective lawn decoration. Place ihe cross-arm 6 feet above the ground, and set 1 screw eyes in the three upper extremities of the cross and in two stakes driven into the ground four feet on each side of the upright. About the heavy cord laced through these screw eyes, twine a light cable in the outline of the Star of Bethlehem. An electrically lighted, revolving wreath may be con- structed from the under-carriage of a toy wagon to which [Continued on page 134] Accept No Substitutes! Always Insist on the Advertised Brand!

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Are you adult, alert, ambitious, willing to study? Investigate LAW! We guide you step by step— furnish all texts, including 14-volume Law Libra- ry. Training prepared by leading law professors and given by members of bar. Degree of LL. B. conferred. Low cost, easy terms. Send NOW for Free ,64-page“‘Law T raining for Leadership.” LaSalle Extension University, Dept. 1493-L, Chicago A SHAW 8” $785 BAND SAW... Shaw 8" Band Saw has all ihe features of the higher priced saws. One piece frame standard construc- tion. 10"x10" tiltIng table. Cuts stock 3" thlek, brz. bearings. Dise wheels. Steel roller guide. 4” saw furnished with machine. Finished in 4 coats grey enamel. $15.00 value. Terms $1.00 with order, bal, c.o.d. Delivered to 3rd zone. THE SHAW COMPANY 416 N. Tenth St., Mil, Wis LABORATORY APPARATUS BIOLOGICAL SUPPLIES MICROSCOPES TELESCOPES CHEMICALS New complete 32 page catsiog lists hundreds of items of interest to FREE! &mateur and professional experi. menters, Save Money-Buy Direct. Send now! It's FREE and erammed full of bargains and valuable information. J. H: WINN MFG. CO., Dept. 201, 124 W. 23d St., New York Get ready now for new money-making opportunlties in Drafting. Clean, well-paid work, Send post card for FREE TRIAL LESSON in Drafting. Shows how easy to learn at home by C.T.C. method. We furnish all tools. Write todny. CHICAGO TECHNICAL COLLEGE A262 Tech Bldg. 118 E. 26th $t., Chicago, lll. BE ~ RAILWAY 1I Write TODAY for the STORY of this WELL- PAID FIELD ACTIVE, RELIABLE MEN—19 to 50—who complete our simple, home-study course, make good money as Railway and Bus Passenger Traffic Inspectors. We place you at up to $135 per month plus expenses, to Btart, or refund tuition. Steady work—advance with experience, Write for Free Booklet. A STANDARD BUSINESS TRAINING INSTITUTE E Div. 6101 Buffalo, N.Y. aL. DEFEND YOURSELF BY JU-DO! Amazing, new, self-defense science, Invented by the Japanese. Now open to the public for the first time. By it, small man or women can easily overcome any attacker. Learn it! Bis tough man charging at you with fists, crash him—ZIP!—to the pavement on his face. Just one quick, sly motion. Anyone threatening you wlth club, knife, gun— knock him senseless in a flash. No wrealhs In your home; wreaths in his home. Complete, ILLUSTRATED, book of instructions, only one dollar, Filled with beautiful, half-tone engravings showing the exact way to perform each trick. You can't, you simply cannot, imagine how easy these tricks will make defending yourself. Send dollar NOW! Get this book of instructions right away! Address:— PROF. G. MAWAISHI,Studio12, Box 365, Mount Vernon, N.Y. When Answering Advertisements Please Mention January Modern Mechanix Hobbies aud Inventions SIX BIG AUTO BOOKS ^LLSHIFPED on approval; whether you want to qualify as garage owner, auto re- pair expert or merely wish to know. how to keep your own car 10046 effliclent, look at these books—they are sent to you for free examina- tion. "This brand new edition has been prepared by a large group of America's greatest automotive engl- neers. Anybody who can read will | understand them, for this great auto- = EI. mobile encyclopedia is a veritab's gold mine of valuable facts. Take advantage of this offer now; send in the coupon for FREE examination. You don’t pay us a penny, you don't obligate yourself to pay any- thing unless you decide to keep the books. Just tell us you want to see them and the full set of 6 great vol- umes, just off the press, will be sent to you! Read them, look them orer &nd prove to your own satisfaction that one fact alone, which you will find ín them, may save you an ex- pensive repair, or help you to a beiter job. Very Latest Edition Imagine books which are so new that every page js right up to date -—vwirlng diagrams, construction details, service problems—are al! right up to the minute. Nowhere else can you get as complete and timely information. Over a million dollars of resources have enabled us to give you the most authoritative books on the subject ever pub- lished. Everybody interested in automobiles in any way will welcome these books published by the world’s largest publishers of Technical Cyclopedias (est. 1897) with agencies all over the world. Can You Fix It? Can you take out *'play'' in differ- entials? Can you kill the “‘shimmy’’ in steering? Can you reset TIM- ING? Can you put your finger on engine trouble without guessing or tinkering ? Can you pull the starter off and fix it? Can you adjust and repair transmisslon, engine, rear axle, bearings? These Books Tell How and tell you how to do any and every auto job right, the first time. 6 Big Volumes Nearly 3,000 pages, aver 2,000 illustrations, wiring diagrams, equip- ment charts, etc, De Luxe edition with gold-stamped flexible binding. Sent FREE for 10 days’ use. If not wanted return express collect, If kept, send only $2.00 after 10 days, then $8.40 a month until the total price of only $24.80, i; paid. A Year's Consulting Membership FREE! Privilege of consulting engineers of million-dollar American Techni- cal Society for one year if you mail coupon immediately, We also include 2 extra books, ‘‘Service Shop Management" and a loose loaf book of new diagrams. American Technical Soclity, Drexel Ave., at 58th St., Dept. A-1320, Chicago DIESEL ENGINES AVIATION MOTORS MOTORCYCLES OUTBOARD MOTORS MARINE ENGINES TRACTORS AUTOMOBILE RADIOS ALL COVERED American Technical Society, Drexel Ave. at 58th St., Dept. A-1320, Chicago, Illinois I would like to see the brand new 6-volume edition of your automobile hooks but without any obligation to buy. I will pay the few cents delivery charges only and will examine the books and return them at your expense in 10 days unless I like them, in which case I will send you $2.00 then and only $3.00 per month until the total price of only $24.80 is paid. You are to include free, consulting membership certificate in the American Technical Soclety and the two extra volumes mentioned above. Name Street Clty eessssessosesehessesessseccseesecece SAIS Leere Employer's Name ......cccccrenncnesccctenscevevesrecnnessee Employer's Address ..,........ceccececeencesenssessescsenens Please give us, in addition, the name and address of one business man as reference. 133

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INVENTORS Pages 8 and 9 YOUR FLOP € PRINT Swn SNAPSHOTS f= Save One Half / Save money developing, printing your own pictures! No experience needed, Send only $1.98 for professional outfit including electric ruby lamp, developing and fixing trays, chemical, photograph paper, complete directions. A $2.65 value, Satisfaction or money refunded, Write for FREE BARGAIN - BOOK of cameras and supplies. CENTRAL CAMERA CO., Est. 1899, 230 S. Wabash, Dept. J-1, Chicago AUTO-ENGINE SPEED CONTROL GOVERNORS To control speed of any make of auto or truck engine, regardless of load changes, Oa DEL when Dd ae 8 stationary or portable y power plant. ‘ull uaranteed. o cas [ 9 CARBURETOR LEVER down. Governor epeed range from 400 to n 3000 R.P.M. Fine opportunity for estab- lished agencies. Send for free circulara. Mfrs, Candee-Smith Gov., Dept. 122-A, 215 No. Los Angeles Strect, Los Angeles. A whole family can learn from one set! Realize your ambition—become a good dancer quickly, easily, at home! Arthur Murray's new pic- ture eourse teaches you popular Fox Trot, Waltz steps, poise, balance, correct following, self-assurance. No music or partner needed. Write today enclosing $1 for six Jesson introductory course. Try course 5 duys. If not delighted with results, money promptly refunded, ARTHUR MURRAY, Studio 281, 7 E. 43 St., N. Y.C., N. Y. 134 Accept No Substitutes! DEV HOURS i 3 Extend Holiday Greetings [Continued from page 132] is attached a 36-inch holly wreath. The wheel supports of the wagon are mounted on a platform and one wheel, from which the rubber tire has been removed, is equipped with strap iron brackets to which the wreath frame of wall hoard is attached A circular wall board background on which the season's greetings are lettered is secured to the axle by means of a strap iron support and lock nuts. This portion of the display remains motionless. Genuine holly leaves are tied with string to a piece of heavy burlap which is cemented to the circular wall board form, the reverse side of which is wired with four 50 watt colored lights. Current for these lights is supplied through two spring brass contacts which ride on two brass strips bolted to the rear face of the wreath. Small red Christmas tree lights secured to the face of the wreath to represent berries also connect to this current source. A round leather belt traveling iu the tire groove of the wagon wheel is connected to the speed reduction unit. Candy pail lids screwed together form the large pulleys of this unit while the smaller pulleys which are screwed to them must be turned on a lathe. Such a unit made to the dimensions given will reduce the speed of a motor from 2,000 R. P. M. to approximately 8 R. P. M. For slower speeds, or for motors of greater speed, another pulley unit may be added. The snow covered face of the flashing “Merry Christmas" is made by molding Plaster of Paris over nails driven into a wall board background in simulation of the uneven con- teurs of banked up snow. Over the opening, theatrical scrim is glued and backed up with a sheet of heavy cardboard in which the letters of the greeting has been cut out. A single 100 watt bulb is located in each compartment and wired to the circuit breaker or flasher unit. The scrim through which the lights shine may be painted any color desired and the snow and circles of the face of the sign are painted white and covered with several thick coats of Silicate cf Soda, or water glass, to give them the glossy appearance of frozen snow and ice. A Vi-inch strip of spring brass, bolted to the Bakelite panel of the flasher unit, is forced into contact with the head of a brass bo!t as diagram shows by the passage of a IA"x1$"Xl" wocden cleat screwed to the surface of the revolving drum. To complete the circuit aud to light one letter of ibe sign at a time. Great Inventions [Continued from page 45] bought in stationery shops. Its pages are pro- visionally gummed, and need only be moistened to make clippings adhere to them. Hunting for a paste pot was always disagreeable to Mark. His third invention, patented in 1895, was for a game to help the players remember important historical dates. Few names are better known than that of Cornelius Vanderbilt, but few realize that three out of the four Americans who have borne it were inventors. The first Cornelius Vanderbilt who began as a farm boy on Staten Island and established the first ferry service between the island and Manhattan, became captain, then owner of the first steamboat to navigate New York Bay and the Raritan River to New Bruns- wick. Then he began to build steamboats of his cwn design. His grandson, second of the name, was not of an inventive turn, but the great grandson, the family’s present head, General Cornelius Van- derbilt, is well known among railroad men for his inventions. He was trained as a mechanical engineer, and the Vanderbilt locomotive firebox has been for years standard equipment. The latest Cornelius Vanderbilt, the General’s [Continued on page 136] Always Insist on the Advertised Brand!

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1500 NEED NVENTIONS Concentrate your talents on Inventions that will pay BIG MONEY. 1936 Ed!tlon of 1500 NEEDED $& INVENTIONS by R. F. Yates tells what inven- tions manufacturers NEED badly. Describes in detall 1500 Needed Inventions in th fields: General Problems; Automotive: Elec chanical; Chemical; Aviatlon; i Also chapters on the Ten Most Needed Inventions, and on new seic tific discoveries important to inventors. Simple, practical ideas—one idea from this book m win you a fortune. If you want to Invent, know what inventions py you the most money. This book tells you. Keeps you from working on Inventlons nobody wants to buy. Large cloth bound book, 250 pages, nine big chapters. Only $2.50. Drop a postal and we will send 1500 NEEDED INVENTIONS C.O.D. We pay postage if you send cash with order. If not delighted after 9 days’ examination, return it and get your money back. INVENTORS’ SELLING GUIDE How and where to sell patented or unpatented inven- tions. Inventors’ Selling Guide by R Yates, noted authority on inventions, gives classified list of nearly 1000 manufacturers who buy ideas. Tells how to sell unpatented inventions safely, how to sell chain stores, how to price Inventions, selling by correspondence and demonstration, how to find buy- ers, etc. Tells what an inventor must know about Law, Royalty, Contracts, Patents Pending, Financing, eee, Gy Pp Schemes, Selling Methods. Cloth bound book, Also: Take Out RRE gen, 19 cha ters» Your Own postpai, or C.O.D. Patents, $1.00 plus postage.) Satisfaction Guaranteed. Making Unpat- BOTH BOOKS FOR $4.00 ented Inventions lf ordered at one time ud Write for FREE specimen pages a Pay, 50c complete catalog of Valuable books for inventors. DONLEY PUBL. CO., 505 Fifth Av. Dept. M1, New York, N.Y. including 312 assorted blades, Adapters, manual, and roller Saw Guide formerly found on expensive machines only. All metal, 15" long, 8" high, 61/2" table. A swift and easy cutter—best ever made for the money. a Illustrating complete power tool line: FREE eu. Saw With oillese bearings, $3 each; Drill Press, The Jigmaker’’ cuts wood up to 2” thick. Shaper, $2.50; completely equipped Lathes, $2 & $3; Sander, S1, ete. All practical tools for real work. Order today or send card for catalog. RKS AIR COLLEGE- -EAST ST.LOUIS, iLL- Offers you college education majoring in aviation Four 96-week courses lead to D. S. degrees in Professional Flight, Aviation Operations, Aviation Mechanics, Aeronautical Engineering. 100 aere airport. 14 buildings. 33 in faculty. 260 enrollment. 5,800,000 miles flight training. 1,520 planes, 509 engines repaired and rebuilt in shops. Graduates with all leading aviution companies, Dormitories, dining hall on fleld. Winter term Jan. dth. Catalog. Write 10th YEAR REGISTRAR, DEPT. MM-1 PARKS AIR COLLEGE, EAST ST. LOUIS, ILL. BEAUTIFUL CLEAR LOUD TONE DIRECT FROM POCKET RADIO! e Dangling Phones to Bother With. AI! one unit — st like the big sets, but weighs only 6 ozs. Fits pocket easily. Take it with you — listen to music, eports, radio entertainment, etc. No batteries, tubes or electrical connections required. A Guaranteed Pocket Redio, EASY TO USE — WORKS IMMEDIATELY Beautiful reception and tone. Accurately made, precisely assembled, rigidly tested, assures excellent performance. Tunes broadcast band. Costs nothin, „to operate and should last for years. Tuning contro is the only moving part. Nothing to adjust. No difficult hook ups. Comes complete wi built-in phone, ready to tune in, with easy Instructions for use in camps, office, boats, picnice, home, hotel, bed, etc., and take it with you while traveling, in auto, bicycle, etc. SEND NO MONEY! Write for yours today. Play it - * BS soon a8 you ge ay Sonatas Postman only 62.99 and a few cents postage. State color wanted (Silver, Brown, Black, White, Blue). An ideal gift. Rmazo your friends. (Little Giant Radio Có», 3989 Lincoln Avenue, Dept. 603, Chicago, Iii. When Answering Advertisements Please Mention Jannary Modern Mechanix Hobbies and Inventions Earn better pay! Get out of overalls! Learn PRACTI- CAL DRAFTING. If you’re a Shop Worker, Drafting will put you in line for quick pro- motion. As a mechanic, Draft- ing means increased earnings, more pay raises, Drafting leads in all industries, DAAFTSMAN gt LS nj 7 N UAE HERE iS YOUR CHANCE Boom in industry and building riow seems well under way. Draftsmen, who draw plans, are needed first. Trained draftsmen will be in demand at better pay, shorter hours. Prepare now! Engi- neer Dobe will teach you at ome in surprisingly few a months at little cost. Tho Road to Advancement JRAFTING In every walk of life practica! 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 expe- xience needed. You must be entirely satisfied with my personal training UNTIL COMPETENT and until assisted to a position, OR YOU_ GET ALL YOUR MONEY BACK. Start NOW and get the training. Prepare for more pay and a better job. Size 20 x 28 Inches Send the coupon below TODAY! Time is money! Don’t delay! No obligations! FU IS E D = B DIE UE > J ENGINE Div. 4731 Send me your free book, ''Suecessful Draftsmanship” and ex- plain bow you will assist me to a good position as a draftsman. hu cc a te ees Age. Address .——— Complete Outfit m w ut

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Sie 3C 304o 4O | on Your New tome.. Don’t pay several hundred dollars more than necessary when you build a home! Buy it direct from our mill at our low factory price. We ship you the materjals—lumber cut-to-fit, ready to erect. Paint, glass, hardware, nails, etc., all included in the price—no extra charges, We pay the freight. Plans furnished—also complete building instruc- tions. No wonder our customers write us that we saved them 30% to 40%, compared with builder's prices, Easy terms rd years to pay. Handsome ri FR EE Pietures ME d homes in colors at money- saving prices. Designs to suit everyone. Write for your catalogue today. A LEWIS MANUFACTURING co. S Dent. y City, Michigan | LEWIS MFG. CO. Dept. 6871, Bay City, Mich. Please send me, free of charge, a copy of your big 4-color Book of House Plans. Sale Catalog —FREE 200 Styles and Sizes of Stoves, Ranges, Furnaces at Factory Prices, Easy Terms —as little as 18c @ day. More Bargains than in 20 Big Stores. Now Year to Pay—30 days’ free trial —360 days’ approval tes 4- hour shipmen S. 1,100,000 Sat- es Write for FREE Catalo, THE KALAMAZOO STOVE c0. MFRS. Rochester RO NER A an DES Michigan "A Kalamazoo haste Direct to YOu” AW DEES = Tool of 100! Uses 7 Does away with slow hand work. Flugsi in anyi light socket, A.C.or D. C. 110v. 13,000 T. p. m. For home, shop or taketojob. Uses 200 difer- ent accessories. . grinds .. polishes . .routs . . drills.. Cuts..carves ..sands..saws For -Sharpens ..engraves. ” Faster Get A Demonstration Better Jobs atHardware, Dept. Stores, Tool Dealers or order on Day Money-Back Trial $10.75 and up postpaid, 3 CRAFTSMAN New Project Book eure and Profit with a Han- 5 wworkingplans farmak- interesting an proj ects: 25c, stamps or emal Accessories Free. De Luxe Model $18.50, with6 Ac- ^ ine cessories. Catalog Free, CHICAGO WHEEL & MFG, CO.,i101 W. Monroe St., Dep. H. Chicago 136 Accept No Substitutes! Great Inventions [Continued from page 134] son and well-known journalist, figures in the Patent Office as the inventor of a shoe-polishing device. The device is about the size of a large fountain pen. Inside the barrel is a polish which feeds into a brush attached to one end, while con- cealed within, wound up like a roller shade, is a polishing cloth. Colonel John Jacob Astor, who went down with the Titanic, patented a device for cleaning ma- cadam roadways, doubtless arising from his ex- perience with dusty roads about his country place at Rhinebeck-on-the-Hudson. It worked on the general principle of a vacuum cleaner, The Colonel dedicated his invention to the free use of the public, this gallant gentleman, like .Washington and Jefferson, disdaining to accept money for his invention. Colonel Charles A. Lindbergh and Dr. Alexis Carrel, author of the book-hit—"Man, the Un- known," have invented and are now testing out an artificial heart with synthetic blood stream, which aims to make it possible to keep vital organs alive and functioning outside the body. Even royalty dabble in invention. Prince Henry of Prussia, brother of the former Kaiser, took out a United States patent on a "windshield wiper" just three months before the Worid War began. Princess Elain von der Lippe-Lipski, now re- siding in Washington, is quite a prolific inventor. Recently three patents were granted her in a single day. One of these inventions, the Princess explained, involves usage of the red and violet rays to work with medical preparations by which surgical wounds that have taken as long as forty- five days to heal can be closed in from seven to ten days. Another is an automobile headlight which brightens and dims itself automatically. The theater is well represented, too. Both Harry Houdini and Howard Thurston, magicians, knew that the only way to stop new-comers from taking the fruits of their labors was to patent the illusions which they performed. Will Mahoney, of vaudeville fame, patented that odd musieal instrument, the Mahoney- phone. And Jimmy Durante was able to register a trademark consisting of the word “Schnozzle,” associated with his photograph and signature. Charles Ray, the motion picture idol cf a decade ago, is the originator of auto turn and stop signal lights, for which he received a patent as far back as 1919. The numerous patents to William Fox and David Wark Griffith, as might be expected, relate to photography and motion picture production. Lee de Forest, of radio fame, has been outstanding in the development of talking pictures. Newton D. Baker, Secretary of War under President Wilson and a noted Cleveland at- torney, last year patented a suction cleaner for [Continued on page 138] Always Insist on the Advertised Brand!

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jd MIDGET POCKET . RADIO | MIGHTY MIDGET TUBE RADIO CAN BE CARRIED WITH YOU! Beautiful Clear Loud Tone Direct From Pocket Radio. Fits pocket easily. All one unit—1ust like the big Bets, but this LIGHTWEIGHT Radio measures only 5 in. x 3/3 In. Take it with you —listen to music, sports, radio entertainment. Easy To Use — Works Immediate No Electrical Connections Required! E Beautifalreception and tone. Accurately made, precisely assembled, rigidly tested, assures ~ ful t excellent performance. Sim lified, centralized =] uning . es brogadcasl and. omes comple: E Handful J with phone in set, with easy instructions, ready to listen, in hotels, camps office, boats, home picnics heds, etc, and takeit wi ‘ou while traveling, in suto, bicycle, etc. GUARANTEED. Nothing to adjust. Wo difficult hook- Beautiful walnut color and modernistie d 8. . SEND NO MONEY! Piay the Mighty Midget Tube Radio as soon as yon get * it. Get yours today. Pay postman on arrival only $3.49 and & few cents postage. Makes an impressive giti Amaze your friends, Mighty Midget Radio Co., 1951 Irving Park Bivd., Dept. 601, Chicago TEACH You? MOU NT. BI RDS ANIMALS, HEADS, FISH Also to tan ekins and FURS. Easily learned AT HOME BY MAIL. Wild game growing scarcer—big demand, e a taxidermist, M. ‘or others, L] Bie Fun, Real V Hobby. Mount common speci- mens — no wild game needed. S REAL PROFITS IN SPARE TIME, FREE BOOK zin FREE BOOK-tells how YOU can learn tnis fine art quickly. Investigate. Send this minute. State AGE. N.W. School of Taxidermy, Dspt.4731 OMAHA, NEB. 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 PUBLISHING CO. GREENWICH, CONN. INVENTORS PATENT YOUR IDEAS SEND FOR FREE BOOK =p HOW TO OBTAIN A PATENT written by a Former Member of the Examining Corps (1922-24) of the U. S, Patent Office, If you want to profit by your idea, you should take steps to apply for a U. S. Patent nt once, Your first step is to get this Free Book. This interesting illustrated book contains valuable information you should have. It tella you fully how to obtain a patent on your idea in the quickest way, With this Free Book you will also receive a “Record of Invention” form on which you can ensily 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 1638 Woolworth Bidg., Dept.17B, New York City Miller Building, Dept. 17B, Washington, D. C. Please send me your Free Book, “How to Qbtaln a Patent,” and “Record of Invention” form. teree vessevesuesoesoooscseasssooosacaseceeaotoeosso ADDRESS etn eecsesssoscosenseesescacetotecoqecevoceo BE ERED z 3 a ARERHNERSSERH When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions VNAUTO ECHANICS Earn $35 to $75 a week as an Auto Mechanic. Never in the history of the automotive business has there been such a demand for TRAINED men. 8 weeks training fits you for a job that's waiting for you or to open your own repair shop. Read what two McSweeny trained men have done. Hun- dreds of others can tell you facts equally interesting. Don't look for a job! TRAIN for it! Farrell, Pa. Dear Mac: Please forward me your catalog. I want it to add to my traveling souvenirs, I am working in a modern garage although 1 have been out of school only four weeks, thanks to MeSweeny Tralning. My spite of the hard times. Many best regards to all. M. Klushauk thanks. Thos. J. Sharp EIGHT WEEKS of Actual Shop Training No books or lessons the McSweeny way. First you learn the "why" of everything you do; then under competent instructors, you DO the job. You work on real equipment and machines, with the real tools of the auto expert. In eight short weeks you are TRAINED to hold down a permanent BIG PAY job. Any man 16 to 50 can learn. Write today for New Low Tuition Offer. Diesel Engines and Aviation Ground Course! Diesel and Aviation coming fast! wonderful opportunities of the future. MONEY BACK GUARANTEE! Eight weeks of intensive training, actual shop work with real tools on real equipment, qualifies you for a Big Pay Job. If not satisfied, your tuition will be refunded. Write today for Big Free Book on AUTOS. Get the facts about jobs; and Low Tuition obligate you. Offers. Mailing the coupon does NOT for Big Money in eight short weeks. It obligates ME to tell YOU how you can train Address Dept. 11-37. McSWEENY SCHOOLS AUTOMOBILE-DIESEL- AVIATION DETROIT, MICHIGAN or KANSAS CITY, MO. 5 Rector, Ark. Dear Mae: Just a few lines which might interest you. 1 left your school two years ago last May. Since | left | have not seen a day 1 could call ‘‘hard times.” | have been working ever since 1 left and have averaged in my earnings $173.00 a month. in Prepare now for the "Write Our School Nearest You r -- am um um RR UR GUN UR R4 wo see McSweeny Auto and Aviation School, Dept. 11-37, Detroit, Mich., or Kansas City, Mo. Without cost or obligation, send me your Big FREE Boots; also full information about your Low Tuition Offer. Name ....... e eeneeeosoesooesasesesstecososooseteosodonson Street. Town ......eeeee eee eo sec ees Bata cccccccees ABO derra 137

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6 WELDERS. GOOD JOBS and Mighty GOOD PAY Do you want to earn big money? If so let us know which of the following trades you prefer. You learn by doing. Practical work. Expert teachers. Low tuition. Personal attention. It will pay you to investigate AT ONCE. Just check the courses you'd like to take and mail today. You will receive full information, absolutely without cost or obligation. But don’t delay. Cheek the Trnde You'd Like to Learn O Welding O Spray Painting O Torch Soldering O Auto Mechanics O Auto Collision C1 Metal Finishing Name .......eososeecsssesosvtesecvecses Address esssessosossowevees Mail the above to MICHIGAN TRADE SCHOOL 3763 Woodward Avenue DETROIT, MICH. BUILD YOUR OWN RADIO Radio Builders? Manual contains 148 pages of instructions for constructing all-wave receivers, short-wave converters, automobile radio, and many other radio devices. Send 50c for your copy. MODERN MECHANIX PUBLISHING CO. GREENWICH, CONN. BE INDEPENDERT! Own and Operate an “Indoor Poultry Farm” One man, formerly an accountant, is averaging $2,500 a year from his 1,000-bird ‘indoor poultry farm"', installed in a remodeled commercia] garage. Milton H. Arndt started this man and many others on the road to success. Mr. Arndt, pioneer of the “indoor poultry farm" movement, and Internationally known poultry speclalist, has written à richly illustrated 160-page book entitled “A New Road to Independence" Mr. Arndt shows how you can start in a barn, garage or empty loft and build up a flourishing business. Flow to sell super-quality fresh eggs and tender, delicious brollers direct to re- tall eustomers, also to restaurants, hotela and roadhouses. This book will introduce you to a new, uncrowded vocation to which pou ean profitably devote part or full time, Money-Back Guarantee Send $1.00 today. We will mail you this book, postpald. If not fully sat- ished, return the book wilhin 5 days. Your money will be promptly Te- funded. MILTON H. ARNDT 22,540 renton, N. J. An ARNDT 12-Hen "Egg Factory." Requires no more room than an ice box, 138 Accept No Substitutes! Great Inventions [Continued from page 136] the dusting of books in cases, It is now being manufactured. Another attorney, Herbert L. Satterlee, brother-in-law of J. P. Morgan and former Assistant Secretary of the Navy, main- tains a private laboratory in which he works on X-Ray and radio inventions. Admiral Bradley A. Fiske, one of the heroes of the battle of Manila, since his retirement, has strayed from his chosen field to the extent of patenting several systems and apparatus for printing in extremely small characters, to be read through microscopes mechanically fed along the printing at any desired speed. The arrangement was intended to conserve space. As the Marines always bob up where there is activity, it is not surprising to find General Smedley D. Butler was one of the pioneers in range finding apparatus. That Arde Bulova takes out a patent for im- provements in watches, or A. J. Reach for a base- ball mask, or that Dr. Vannevar Bush patents an improved radio system, is hardly news. Neither is it news when Henry Ford patents another im- provement in automobile structure; but few are aware that he has patented 100 such devices. It was as late as 1930 that the patent laws were extended to embrace certain new forms of plant life. Among the first patents granted under the amended law was one to Harold L. Ickes, now Secretary of the Interior, for a dahlia. Two other plant patents have subsequently been granted to Mr. Ickes. As fate would have it, the new law took effect so near the end of Luther Bur- bank’s career that only one patent was awarded him and that was granted after his death. Women as inventors run largely to feminine or juvenile devices. Thus, Mrs. Winifred (Hudnut) Guglielmi professionally known as Natacha Ram- bova, patented a combined coverlet and doll shortly before the death of her famous former husband, Rudolph Valentino. Mrs. Horatio Nelson Slater, famed as a leader in New York society, patented over twenty in- ventions. The profit from her inventions has been devoted to charity. Several of Mrs. Slater’s pat- ents relate to dolls. She also patented a military blanket, an automatic ice-case for refrigerators, a book cover and a couch and chair. Other women have worked entirely in man’s field. Mrs. Martha J. Coston invented the flare light used by mariners all over the world. Maude Adams, actress, has given much research and energy in attempting to develop motion pictures producible in daylight. There is Miss Beulah Louise Henry, of New York City, who has received the soubriquet of “Lady Edison” for her many inventions, ranging from football valves on through a new type of sewing machine. Though her total of fifty patents may seem small compared with those of male [Continued on page 150] Always Insist on the Advertised Braud!

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HANDY MAN'S. HOME MANUAL: New 1937 Edition ON SALE 144 Pages 800 Pictures How To Repair— Broken Furniture The Home Radio Set The Basement Furnace Home Plumbing and 1000 other items for the ailing home How To Make— All-Steel Auto Trailer World Wide Radio Colonial Furniture Toys and Games and other interesting home shop projects Get your copy now at your favorite newsstand or order direct from: 50: Fawcett Building Greenwich, Con "MODERN MECHANIX PUB. CO. 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 Flectrical subject fully covered. 10 big Volumes and all shipped FREE for cxamination. BIG FIELD! Big Demand! Bi JMen who understand electricity ig Pay gare urgently needed right now In thousands of industries. Autos, airplanes, machine shops—practically every in- dustry depends on electricity and rnen who know this subject make big money. Pleasant. fascinat- ing w . easy to learn and do; learn quickly with these books. Send coupon for a set for FREE examination and see for yourself. A year's consulting membership in the Americau Technical Socle- ty now given free to all readers of this 'arnous Cyclopedla of Elec- tricity. Many say, ''That's worth more than cost of books." AMERICAN TECHNICAL SOCIETY Dept. E-1320, Drexel at S8th St. Chicago ee ae ae Nee Na EN venen VS VUE us us Rm ma mo m American Technical Society, Dept. E-1320, Drexel at 58th St., Chicago Send for 10 days’ (ree use, BRAND NEW 10 volume set of Electrical Engineering. n return for mailing thls coupon promptly, send free certificate of membership in the American Technical Society entitling me to full consiilting privilege for one year. I will pay the few cents delivery charges on the books. If I wish I may return them In 10 days and owe you nothing. but if I keep them I will send 82,00 after 10 days, then $3.00 a month until the special price of only $29.80 1s paid. For Beginners and Experts Over 3000 pages— hundreds of illus- trations—the most complete work of its kind ever pub- lished. Dynamos, motors, power stations, radios, television, every- thing electrical explained clearly so anyone can understand them. Name .-.-..-.-.2-.2-2------- ————M——(Ó Address ..-.-2.2..-.------ ———————MÁ— —— Pr eee State ---..-.--- City a --- Please attach.letter stating age, occupation and name and address of employer and at least one business man as reference. Just a handful—Wt. only 11% lbs. Size, only S15Xx5x21-z H: two multi-purpose hi-gain tubes, hil-eflieiency coil and precision parts.— BUILT IN AERIAL! Midget BUILT IN speaker operates with beautiful clear tone and clarity on all stations on broadcast band and ALSO police calls! Actual four tube performance with real distance and punch for so tiny a vadio. ALL ELECTRIC (Battery model nvailable). Easily carried in a large pocket or tucked in Ssultcase. Ideal second or personal radlo. Colors to match any room—beautifully fin- 3 € = ished breakproof cai ets. Only hi Grade parts used—a truly trouble proof midget. Late improvement: sers report wonderful reception in ALL PARTS OF THE WORLD. Uses 110 volt AC or DC current—any cycle. Kit of parts with tubes and diagram, $6.48. COMPLETELY WIR! and factory checked, 50c extra or $6.98 as shown. Send only $2.00—pny postman balance, Guaranteed to operule anywhere. lors: White, Black, Brown, Blue, Green, (Battery model same as above com- plete with self-contained batteries same price). ORDER NOW! TINYTONE RADIO CO. Dept. M-1 Kearney, Nebraska What a thrill when you play your first tune the very first week on a P-A Sax, Then popularity .. . ade miring friends, good times, a. glori- ous future. Try a new model P-A Sax, Trumpet, Trombone, Clarinet at your local music store, or write for beautifully illustrated book. Finest instruments at amazingly low prices. Easy terms. Write today sure. 1245 FREE PAN-AMERICAN BAND INST. & CASE CO, BOOK 130P-a Bullding ELKHART, INDIANA When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 139

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[ALK-SING - PLAY hru your own radio BROADCAST your voice on programs coming through your radronet--maue ane mouncements from sny Pt of house inject Wand rei? riend rid Mi made ay a cae altached in a jy. Nota Toy. Ao B ut r4 om PS min at Tiro. Barrels of tuni Easy everton PRICE 25c POSTPAID Johnson Smith & Co, BoE Dept. 366. Detroit, Mich. RADIO MIKE (25 Large, substantial al Swell for practising s talking, amateur pi e producea the voice "erteeiy. n loud | flear tone without any distortion, Re lar table model that ean bo held and. Guaranteed to work an any mi sets, shor Get forei, SONT. BE BULLIED Tha Ji art et New pur of attack and di lock», nelsaors, holding a men down, double kres throw stick attach defense ngminst halts, one hand throat grip. de- fense agnínet two axnailanta ach throw, noceret thumb unockout, nerve pinches, and numerous othe era. Learn to protect yourself ug- der all circumstances with naturo a E int Scienca rem “Stet Onty 30 ean! CHAMELEON 25c WATCH IT CHANGE COLOR! Get one of th idi t «reat Match it SS Colors Stay pos fu "ar one is on Del of your coat aa m cui Shoot? out tongue te catch fice and Insect ood. No trouble n qo month without food: Aboni U. mali re the prover timo end’ peeling cff a genuine bili ihe catside of the roli fect created will be [x to É oe raliter socor 33.50 per “thousand posioaid. 250 Magic Tricks

e Nd cn perform thom. INOUS PAINT, when applied to an ob; isch emita raya of shite Want, renderin ar! ‘shines. Simp! ply some toti tcp 39 Fou cen tell time at ni < uttons, mwitches, anything, ev E {small bott $c, Medium Size Goe, WONDERFUL X-RAY 10c GREAT CURIOSITY! With it you can apparently sea the bones in N Ante lead In a pencil, even By the flesh stems transparenl, A Ñ wayo ready for us niy 10 ceni fs postale cn : ion 2 SES Comig Recatanone, Funny Raadingo, 11 Euler Pastimes, lames @ thelr Meanings, lop xperiments, „Deaf and Du hy, Forums, Teller. Fortunes lypnoem, Ven- ers, Chens, Domin Spanish Prison Pur: Eu Gasing and pasti Accept No Substitutes! BLANK CARTRIDGE PISTOL REVOLVER STYLE 5 0 c 1° tartin Pi tol ete. Los "a Kr Ke 4 lani care id, Er type) 50a Miidped by express only: Hat prepaid Hi-Powered Air Pistols de Alr Bhaped Uke an Aut res 109 shots In onolosding. Sinule Shot shes 385 Shor hatoi 35-00. REPEATING SLING SHOT Avtomatle repeating oli hot that will fre: To shota with one Dt for accuracy. powerful end weil throug) a 10 pare magna ine. ward thi

der and. Will shoot everything from roche to ‘his ut the magazino le mi 150 BB. eset E iu VosIPSld Vibe of 200 Coppe goned B! ng from parts you can get from Junk deal ore, le coata only e few dollara, part ‘illustrated im tho comprehensive aigned its thea z rage d Moaedy. Start buildingg blue-printa, ma New Vest Pocket dding Machine Here It In. bogal TU 109ts 12 vals rain: an withou a pauat lasá thel be er and keep on Reng un ‘Th oma] Dacre! ly empty, Then re! n tz Eampiate Wh ta target d ONLY Ze. Ho» ster wit t for Peamatic| only 2Sc. eX p. catalog Iüc. Pistol Cigarette Case Tt looka like a deadly weap- on, but it Is merely a novel Ci the trigger "iod the aide losing cigarettez, orice 2 MESS ALL OR PEEDY 8 HOUR SERVICE ON ALL ORDERS, SEND tOc FOR OUR BIG CATALOG WITH ALMOST 600 PAGES OF BOOKS, NOVELTIES, TRICKS, USEFUL ARTICLES, ETC. BOYS! BOYS! BOYS! THROW YOUR VOICE fin fooi li jun INTER Y VENTRILO A od: ap To Gi- inches wide any length, land attractive writing. You, n famlilarize yourself with the arrangement of t hat short ilme you paturaliy ac characters ero uned, Heavy welded and rivits colored enamel. eet, H, Friends adore it. Besi dancing Ia not oni and entertaining Ware way ithon dieting. Rei "hunk you for wading tap Ing to my accomplirhments.’ epo. ways tuvartest elap Wi parit eet elepo, without teacher. Don't make excuses when the muele slarin. Get tots Pf fon from paralea mnd dancer: you want te perfect dancer, learn lo dance st hono insnew cay way, BOON TELLS) “How to develop PE aad contre Improve your steps, Ai how!

pullin, ‘Sect is Mee boler gen and ine ‘ates the engl Foolproof, h aranteed toron. ine is beant falls Iithexraphed Inscvorbl colore. worth & dollar, New model which rans, 7 1 ined heat only 25c, add 100 and packing. l, J50 plua 109 for postage a aot ke f or Uncle ON In one, Odd, cu: J ocu Lote. si pleasure, Rsefuls " Double Micro. 6 wonders of (tore. Ope? e for exuminin, he wonders Tess, Pocket Hinar or esi re Glass, 3 [ns Gaza, Telercope, Compass" t Eh ID". fer e: di da (iat T. Some! t mh it. [x "niv Soe univ Jie pat: TR "MAGIC F LUTE ou can musician nnd play zi ins intent popular sangu, ragtimen, old time ballads, ered ny mim. dence muster ninoi ang accompaniment, The tor fo inseri ki = h facility and, EMT: ur Price 10c, 3 for FOR GOODS ON THIS PAGE To. Coc SMITH & CO. - DEPT. 366 iming Bigger and beller Ihan evel never thought exi 600 pages a! m. unusual boak rå- ar e inchs. fa T irs you Always wanted re Goods, pi INVISIBLE INK, CAN BE READ ONLY BY THOSE WHO KNOW THE SECRET, USED BY SPIES, ETC. COMPLETE DIRECTIONS. DETROIT, MICHIGAN hew ems Ings Ihar you orel Neatly . uela dme savers, seedy, [ ric Noo pied agyeliiry, FIELD GLASSES WOW! Whetebarzein Real, Glas; gure, ono finger focussing. mira ful unnam. oe: wo-ered vision that gives Temark Sorell dy, hlk- ing, sports und u million other things. Complete with. cord, packed in poz Only 2. ELECTRITE PENCIL Eiecuie ent y in gold’ or ar fe in "gold" or any our car, wallet, gram or niti other color on galfelubs, foun! ete, Print end decorate anythi boya and girls can carn extra cash easily by dolna thie fo other people, Every time y: id excepi Seconda timal Easy to wee, plag in electric t apek meil da TRITE with lea fe PIU SHE esos. Price 1.00 uei ope for only cope FERES Swell for out. doore, nature study, spei ing. ‘at the ms Peouverted lar Talesi Sge by wine smoked gaan Vo yeu can peo pun spots, etc. round lenges, rae Riele desert rp eked in box, Price i THRIFT VAULT B A dis! cate lock and, Veolt Rank. Just d

hom etal red E black TRU Ful lestructions with each bank., VAULT BANK only SOc postpaid. THRIFT VAULT Siml- iy in spyeerance to the above only made d of welded mtrel, and elightly larger." Packed, t complate. direcione for opening Price Stas Postnsid

Did you everíoose or form Probably many Kiel Don more about los ihat matter), as theso master x x im mary lec! s dif- vs ree of Tocun. lr. a only osa them Sul prenkbly Mod" them a 'eu* always carry th them. See joc urglar poof- piers eet of hve skeleton keys 25c. 125 CARD TRICKS Containg al! tho tricha and decept- ards vente icing the ticks of the most cel Conjurora, Magici Preatidigitators. "Bi adapted fur he oriel «n!

Four onigue Lighters Bes tvstraced above ib. M Boer? and om ten sir Prnt and one which Into your elguretie case! Your choice, only ise : DANCING s jointa? figure of e skeleton 14 In. A5] dence | to moalo ic endl 0G grati 10c PER BO' Always Insist on the Advertised Brand!

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SCREW FEED DEL. LATHE only No. 355—6x18" METAL TURNING LATHE WITH LONGITUDINAL SCREW FEED. Length overall Machined semi-V ways. T o. O MORSE TAPER CENTERS. between TWO BRONZE BEARINGS. TAPERED BEARING. L5" tallstock set-over. Compound carriage travel m semi-V ways Eibbed for take-up. Compound swivels thru 36809. Included: Two 60° centers, tool post assembly and 4” face plate— 3” four jaw chuck $3.50; 4" chuck $4.50; Chuck adapter bushin: 50 cents. Tapered arbor with flanges and nut and l4" chuck & Send $2.00 with order, balance C. O. D. Shipping weight FREE 32-page catalog. cents. 30 lbs, MOTOR & SUPPLY CO, . Clinton St. Chicago, lll. WELDING TORCH LIGHTER AUTOMATIC — ELECTRIC Open torch valve slightly—Tap the Magic- Button—it's Lit A quality product, designed to give years of Service—insulated against electrleal shocks, Safer than matches, less troublesome than 2: fiint Ilgliters also faster and cheaper to use than either. For Bench Mounting ONLY. Cost of operation so small It could hardly be measured. spark. 110 Volt Model illustrated! Satisfaction Guaranteed or Money Refunded. $5.00 Postpaid. Other Voltages on request. If Your Dealer Cannot Supply You—Order Direct. XENIA, ILLINOIS FLEMING MANUFACTURING CO. Dept, B1, No jump- Learn Public Speaking At home—in spare time. Many overcome stage-fright,’’ gain self-confidence, and increase their earning power, through ability to sway others by effective speech. Write for free Booklet, How to J ‘ork Wonders With Words and requirements. NORTH AMERICAN INSTITUTE, Dept. 2051 3601 Michigan Avenue Chicago, Illinois ART LESSONS (qs: Become Talented Artist with Big Income This Shorough course by. Alexander Murray, PAID famous Art School Instructor, makes |t easy learn art tn spare time. Teaches commercial art, cartooning, lettering, anatomy, perspec- [COURSE tive, adv. layout, etc. without bother or ex- COMPLETE Pense of corresponding. You get all 60 lessong at once—no waiting for next lesson. Over 815 Instruction Illustrations. 125 pages of drawing aper FREE if you order from this ad. Send p: only $1.98 for Complete Course postpaid—or pay postman plus postage (U. S. A. only) MONEY BACK if not delighted after inspecting. EDUCATIONAL SUPPLY CO. Dept. A113-A Racine, Wis. FREE BLUEPRINT BOOKLET! The 1937 MM Blueprint Catalog contains more than 100 illustrations and descriptions of boats, camping trailers, light planes, radio sets, furniture, models, auto racers and dozens of workshop projects for which blueprints are available. Send three cents for your copy now. Send stamped, addressed envelope to MODERN MECHANIX PUBLISHING CO. Fawcett Bldg. Greenwich, Conn. WT Earn Cash az Home? en We paid M. M. $267 in 3 weeks for exceptional ''cellar erop’ patented mush- rooms! Rig free picture book tells if your cellar, shed, barn suitable, We buy all crops ihra ten branches. Write today. (Estab. 1908.) UNITED MUSHROOM CO. 3848 Lincole Ave., Dept. 77 Chicago When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions SEE THEM IN YOUR ALLIED CATALOG America's most amazing radios! The latest de- velopments in radio—new Giant Magna-Span dial, Flywheel Tuning, mighty "Vita-tone" speakers, "Electric Eye", Visual-Wave Band Indicator, perfected metal tubes, etc. Tone quality, sensitivity, selectivity, all-around per- formance, that again proves what tremendous values only ALLIED can offer. All-Wave, Dual- Wave and Short-Wave—5-19 tubes—AC, AC-DC, 6-volt, 32-volt, battery and auto sets. See all 38 models in ALLIED'S Free Catalog! Everything in Radio at Lowest Prices Besides the amazing new Knight Radios, ALLIED'S 152-page Catalog includes the latest Amateur Trans- miHers, receivers and transceivers; newest Public Ad- dress equipment for every Sound need—Over 10,000 exact duplicate and replacement parts—Latest test equipment; Rurlpower units and Windchargers—and dozens of new Kits for Set-Builders. You'll always find greatest values in your ALLIED Catalog. If you don't have one, send coupon now for your Free Copy. {sis ree P Lis y nor Free t. FeR adios icol us, pocket Boles M. Bo Si Ca porta’ mate yeni get 9 ue, $ = H eov. 1 T E EIE TS Wyse, quoe Overs yS gite Tul * oly Delo nets qune Dan Pio Booer, Cr mets we puridins erect aere for grouite maned Vochant* ee n moder sit B| 833 W. Jackson Blvd., Chicago, Ill, Dept. 6-A C] Rush me a Free Copy of 1937 ALLIED Catalog. | D Send me Free Parts List for Name .......... eer ee et oe e wu eesecoctosec | Address . —Ó | City sessesesecscesoseoseeso eseese State eese La m m m m m ee 141.

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A. C. GENERATORS PRACTICAL changes for automobile generators. See our advertisement at bottom of page 27. Autopower, Inc. ADVERTISING AGENCIES LEARN advertising quickly at home. Easy practical plan. No text books. Common school education sufficient. Interesting booklet and requirements free. Page-Davis School of Adver- tising, 3601 Michigan Avenue, Dept. 2048, Chicago. ADVERTISE: Get mail-order business, agents. Free assistance. Free Ad- Guide of newspaper, magazine, circula- tions, rates, mailing-lists. Chicago Ad- vertising Agency, 22 West Jackson, Chicago. ADVERTISE: 24 words m 250 news- papers $10. Lists Free. Advertising Service Bureau, 4258-B Drexel, Chi- cago. FREE NEW advertisers rate guide. Brown Advertising Agency, 140 South Dearborn, Chicago. AGENTS WANTED I WANT MEN for local Tea and Coffee routes. Make up to $42.50 first week. Automobile given producers as bonus. No experience needed but must give prompt service to families on your route, I send everything; no money risk. Write Albert Mills, 2233 Mon- mouth, 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- lars and free sample. American Mono- gram Company, Dept. 11, Dunellen, New Jersey. AGENTS: Smash go prices. Santos Coffee 12c 1b. 4-oz. Vanilla 814c. Razor Blades 10 for 8%c. 100 Sticks Chew- ing Gum 12c. 150 other bargains. Premiums. Experience unnecessary., Carnation Co., MN., St. Louis, Mo. $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. K-164, Cincinnati, Ohio. $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. K-84, Cin- cinnati, Ohio. MAKE More Money Ties, Underwear, Raincoats, Jackets, Pants, Uniforms. Sales Outfit Free. Nimrod Company, Department 132, 4922-28 Lincoln Ave- nue, Chicago. Selling Shirts, Dresses, Hosiery. START Bargain Business. Large profits. New and used clothing. Bank- rupt and auction sale merchandise. Experience unnecessary. supplied. Publix, Chicago. AMAZING New Product plates with real silver. Fast sales to housewives— big profits—one minute demonstration. Write quick for details. Puritan Labo- ratories, 1612M Summit, Akron, Ohio. WHERE To Buy At Wholesale 500,- 000 articles. Free Directory and other valuable information. Maywood MM. Publishers, 925 Broadway, New York. 142 Everything 568-KH Roosevelt, Classified Advertisements Rate for classified ads, 18c per word (include name, address and all numbers) per Insertion. accompany order and be received in this office December 3rd for the February, 1937, issue (on sale December 29th). Classified Mor., Modern Mechanix, Hobbies & Inventions, 1501 Broadway, New York City BE Your Own Boss! Operate used- new clothing business from store, home, auto. 200%-300% profit. Everything furnished. Catalogue FREE. Port- noy, 566-AL, Roosevelt, Chicago, WILY Work for Others? Make and sell your own goods. Formulas, Toilet Articles, Perfumes, Extracts. Valuable book Free. Scientific Laboratories, 1959W Broad. Richmond, Va. AGENTS—Lowest Prices—Top Profits on carded Aspirin, Razor Blades, Hand- kerchiefs, Laxatives, Shoe Laces, etc. Details Free. Better Products Co., Dept. 2719, Marion, Ind. 1000 BARGAINS, Drygoods, Notions, Drug Sundries, Specialties, Novelties. Agents undersell stores. Free catalog. Jobbers. Dept. 1398-A, 930 W. Roose- velt, Chicago. BIG Money Applying Gold Initials on Automobiles. Easiest thing today. No experience needed. Free samples. also 1084 Washington, Boston, Mass. GOLD Reflcting Letters for store windows. Easily applied. Large sizes, penny each, free samples! Atlas Sign Works, 7941-G Halsted, Chicago. GOOD Income Plating Auto Parts, Reflectors, Mirrors by late method. Free particulars and proofs. Gunmetal Co., Ave. A, Decatur, Ill. NO BOSS! Sure Cash! Silvering ‘Mirrors, Autoparts, Reflectors. Combi- nation outfit. Write, Sprinkle, Plater, 850, Marion. Indiana. AMAZING Cleaner; Cleans thing. Whirlwind 25c Seller. 17c. Sample Free. Berwyn, Ill. MONEY-MAKING personal hygiene specialties that really sell and repeat. Liberal profits. Write Pat Faris, Tom- ball, Texas. LEGITIMATE spare-time income op- portunities. Free literature. Charltoc, Box 6310 West Market St., Philadel- phia, Pa. AGENTS’ Gold Sign Letters for store windows. 500% profit. Free sample. Every- Profit Super-X, 15, Metallic Letter Co., 426 N. Clark, Chicago, PUNCHBOARD MEN—Put and Take Jars. Samples, details free. Tom Thumb, Dept. MM, Nauvoo, Ill. SELL Novelty fun cards, novelties, etc. Samples, list 10c. National, Box 500H, Cincinnati. AMERICAN POLICE JIU JITSU 13 KNOCKOUT Blows without use of fists, hy internationally famous Jiu Jitsu instructor. Send 15 cents. S. J. Jor- gensen, 278 Maritime Building, Seattle, Washington. ARCHERY RAW Materials, finished tackle, com- plete line. The Hobsons, Salem, Ore- gon. AUSTRALIAN OPALS OPALS. Lovely colours. Beautifully illustrated catalogue postfree. Norman | Seward, Melbourne, Australia. Accept No Substitutes! Minimum !0 words. Cash must Address AUTOMOBILES 2e E ae deg tS NEW book covering every detail of auto electric system, including magneto ignition, Step by step trouble shooting. Questions and answers. One dollar post- paid. Satisfaction or money refunded. Allen Electric Manual, Dept. M, Box 83, Detroit, Michigan. GUARANTEED Anti-Freeze Formula 50c. Absolutely safe, uninflammable, rustproof. One mixture for any tem- perature. Costs 5c gallon. Contains no alcohol or glycerine. General Prod- ucts Company, Box 141, Terre Haute, Indiana. POWER and speed equipment for Fords—Chevrolets and other cars. Midget engines and parts. Catalogue 25e. Cable R. C. O., Robert M. Roof, R. & R. Mfg. Co., Anderson, Indiana, U. S. A. GUARANTEED semi-diesel conver- sions for gasoline motors, $12.00. En- close stamp for illustrated literature. Des-a-gas, 1719 Addison, Berkeley, California. USED auto parts at half price for all cars. Century Parts Co., 1712 Lafayetle Ave., St. Louis, Mo. AVIATION ARMY AIR CORPS gives free flying iraining, salary, expenses paid. Infor- mation pamphlet, how to apply, 20c. Same information, Navy Aviation train- ing, 20c. Information on Marine Corps Aviation, 20c. All three, 40c. Used airplanes, $40 and up. Literature 10c. Continental Sales, Box 344, Dept. 23, Indianapolis, Ind. GET INTO AVIATION. Air trans- port pilots get up to $7,000 per year; mechanics, $2,500. Learn at this Gov- ernment approved school. Write for complete information. State age. Lin- coln Flying School, 4002 Aircraft Bldg., Lincoln, Nebr. AEROPLANES, New Produciion, $98.00. Easy payments. Propellers for aeroplanes, boats, sleds, wind-driven generators, $2.50 up. Send 25c for more information. Hibbs, Fort Worth, Texas. YOUNG men interested in entering aviation under Apprentice Plan write immediately enclosing stamp. Mechanix Universal Aviation Service, Strathmore Station, Dept. C, Detroit, Mich. BROTHER, Can You Spare a Dime? If you can, send it to me and I'll send vou my Low-Priced Aviation Material Catalog. (Canada 20c.) Karl Ort, 646 W. Poplar, York, Pa. AVIATION apprentice jobs for inex- perienced workers. Complete list em- ployers and details 20c. Airployment, Box 553, West Ios Angeles, California. HUNDREDS Airplanes, crackups, terms, Complete catalogue, 25c, post- paid. Aircraft Directory, Athens, Ohio. BLUEPRINTS METAL TUBE Midget Radio, the last word in compact radio receivers. You can construct this set even though your knowledge of radio is limited by follow- ing the Jarge pictorial blueprints avail- able, from Modern Mechanix Publ. Co., Greenwich, Conn., at 50c postpaid. Always Insist on the Advertised Brand!

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BOATS HOW TO BUILD 20 BOATS—The big new edition contains twenty differ- ent up-to-date plans for sailboats, ice- boats, rowboats, outboards, cruisers, and speedboats. The price for the book, 50 cents, makes each plan cost only 214 cents, Order your copy from Modern Mechanix Pub. Co. Fawcett Bldg.. Greenwich, Conn. BOOKS & PERIODICALS SPORTSMEN'S MANUAL—The out- doors man's guide containing scores of practical articles by America's leading outdoor writers, covering every phase of fishing, hunting, camping, and trap- ping. This hook, edited by Robert Page Lincoln, will make that next vacation a dozen times more enjoyable. Price 50c at your newsstand, or order directly from Modern Mechanix Publishing Co., Fawcett Bldg., Greenwich, Conn. BOOKS! Books! Books! Used books wanted. TIl pay cash or exchange any new hooks you want for your old ones. Send 25c in silver for my book cata- logue Today! Levi Bryant, 654 East 44th St.. Chicago, Illinois. FREE—Send for list of new technical hooks at sensational discounts. R. 124 West 23 St, New York. BURIED TREASURE TREASURE Seekers—Learn scientific methods. Wyss, 10414 Francis, St. Joseph, Mo. BUSINESS OPPORTUNITIES PLASTEX Industry needs manufac- turers on small scale and for big pro- duction of X-mas Tree Ornaments. Crib Sets, Art Goods, Novelties, etc., in Plastex and marble imitation. Cheaply and easily made in our guaranteed rub- ber moulds. We cooperate in selling goods. Since crash, low priced goods are needed and this line meets demand. Interesting booklet mailed free. Plastex Industries, 1085 Washington Ave., Dept. R. New York. N. Y. " CDEC AME. Na Em i rires. MONEY for you making window boxes and selling supplies to all who raise plants in house. Fasy, pleasant, profiit- able. Steady work for all or part time; can grow to large proportions if desired. Free information. C Decorative Sales, 63 Baumer, Johnstown, Pa. MAKE Artificial marble, glossy tiles, uncanny. Tabletops, plaques, floors. whetstones, noveltics. Cement secrets, hard, fireproof, inexpensive. Brilliant tile and liquid rubber samples 3e. John H. Payn, 945 Grande Vista Ave- nue. Los Angeles, Calif. WE START you in business, furnish- ing outfits and instructions, operating “Specialty Candy Factory" home. Men and women, earn $25.00 up to $75.00 weekly, all or spare time. Booklet frec. W. Hillyer Ragsdale, Inc., Drawer 110, Fast Orange, N. J. IF YOU Have Some Spare Room, a basement or garage where you can do light work, see our offer to Branch Manufacturers on page 29. Metal Cast Products Co., 1696 Boston Road, New York City. STOP squealing, start crowing! Work mornings home, drive in country, or “movies” afternoons! Unusual plan. No canvassing! Prepare for surprise! National Folio-C (Station "D"), Los Angeles. FREE circulars describing hundreds of money making opportunities selling by mail. Build your own business. Write now. Progress Publishing Co., Box 1936M. Milwaukee, Wis. GET barrels of money-making mail. Your name in 10.000 Directories, 25c. Roservice, 4627 Glenshade, Cincinnati,

When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions Giant Winged Figures Decorate Boulder Dam

This plaster winged statue will even- tually be cast in bronze with a dupli- cate to match it. They will flank the 125-foot Boulder Dam flagpole on the Nevada side of the Colorado River. The figures will be 30-feet high. 350 SUCCESSFUL, guaranteed Money Making Secrets sent complete post paid in plain sealed wrapper for 50c; Ne stamps. M. L. Allen, Box A, Zillah, Washington. THE COLLECTION BUSINESS offers profit and opportunity. Quickly learned. Sure income. Write Cole Associates, Syracuse, New York. ANSWER mail for us. $5.00 daily possible. Postage and supplies fur- nished. Contract 25c—coin refundable. Vollmer’s, North Bend, Oregon. SUCCEED With Your Products. Make-Sell Them. Formulas, Processes. Accurate analyses. Catalog free. <A.

Thaxly Co.. Washington. D. C. CORRESPOND for newspapers. Profitable, interesting. Easily learned. Write Publishers’ Service Bureau, 4258.E Drexel, Chicago, Ill. NO BOSS! Sure Cash! Silvering Mirrors, Autoparts, Reflectors. Combi- nation outfit. Write, Sprinkle, Plater, 845. Marion, Tndiana. AMATEUR Cartoonists may earn up to $55.00 weekly, copying cartoons foi Advertisers. M-Syndicate, Argyle, Wis consin, MILLIONS Jobless!! Make money supplying job-getting information (stamp). P. O. Box 16, Westfield. Mass. SIGNS. Any kind easily painted with Letter Patterns. Write for free sample. John Rahn, B1330 Central, Chicago. SELL hy Mail! Books, Novelties! Bar- gains! Big profits! Particulars Free! H. Elfco. 438 North Weils, Chicago. MAIL Business. Start small. Every-

thing furnished. Free details, Metro- mails, M-1, Cincinnati. DOLLARS Daily. Operate Homc! Mail-order Businesses. Details. Duffy- Co., Covington. Kv. "MASTER Mail Order Plans" are profitable. 10c. Naco, Frankford, Delaware. MAII, ORDER Opportunities. Litera- ture. Silvester & Co., Old Bridge, N. J. CAMERAS & PHOTO SUPPLIES CAMERAS and supplies. Free illus- trated catalog listing everything photo- graphic—stil and movie cameras, films, lenses—at tremendous savings. Hun- dreds of bargains, new and used. All guaranteed. We take your old camera or equipment in trade. Write now for your Free copy of our newest money- saving Bargain Book-—just out! Limited edition. Hurryt Central Camera Co. (Photographic Head- quarters since 1899), 230 So. Wabash, Dept. 1-J, Chicago. MAKE money in photography. Learn quickly at home. Spare or full time. Easy plan. Previous experience un-e necessary. | Common school education sufficient. Interesting booklet and re- quirements free. American School of Photography, 3691 Michigan Avenue, Dept. 2048, Chicago. expense. T you to make photographs for magazines, newspapers, advertisers, Tremendous demand. Earn good money wherever youlive. Free book. Universal Photog- raphers, Dept. A, 10 West 33rd St., New York.

BARGAINS in New Cameras. Special Discount on Kodak Films. Catalogue Camera Store, Sac City, Iowa. CARTOONING CARTOONING, Sketching, lessons, 600 illustrations, including practice sheets, pens, pencils. $1.00 Complete. Fraba Service, Dept. M-2, Cashton, Wisconsin. MAKE $25.00 weekly duplicating Ad- vertising Cartoons. Write Paisley-M, Kinloch Bldg. St. Louis, Mo. CHEMISTRY SEND 25c for new illustrated chemical Experiment Book with over 300 formu- Jas and tests. Also receive 32 page illustrated catalog of apparatus, micro- scopes, telescopes and chemicals free. C. Winn, 124 West 23 St, New York. DETECTIVES BECOME a Successful Earn Big Money— Travel. Newspaper and Particulars Free. tional System, 425-D, Fremont, braska. DETECTIVES—Make Secret Inves- tigations, Experience unnecessary. De- tective particulars free, Write, George Wagner, 2640-V Broadway, N. Y DUPLICATORS INCREASE Business. '"Excellograph'" Rotary Stencil, Clay, and Film Duplica- tors $3.85 to $37.50. Prints anything typewritten, penned, drawn, traced. Colars. Folder Free. Pittsburgh Type- writer Supply, Suite 519, Pittsburgh, Pa. Free.

ete.— 46

Detective. Detective Na- Ne-

EDUCATIONAL & INSTRUCTION WORK for “Uncle Sam". $105-$175 month. Men-women. Many 1937 ap- pointments. Try next held examina- tions. Common education usually suf- ficient. Qualify now. Influence un- necessary. Full particulars, list jobs and sample tests. -Free. Write today sure. Franklin Institute, Dept. T64, Rochester. N. Y. MEN Wanted--Learn ‘Tool & Die Making. Automatic Screw Mach. Machinist Trade. Big Demand, Actual Experience. Expert Supervision. Write for Free Book "M". Allied Screw Machine Co., Ine., School Div,, 603-9 Lake St.. Chicago. SIGNS. 27 Easy Picture-Way Lessons teach you popular easy lettering, layout, and color quickly. Complete instruc-

tion $2.00. Guaranteed | Stewart School, 3553 Aberdeen, Alton, Illinois. 143

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WORK for “Uncle Sam”. Start, $105- $175 month. Age 18—50. Want to qualify for next entrance test? Write, Instruction Service, Dept. 234, St. Louis. Mo. FOREST Jobs available $125-$175 month. Cabin, hunt, trap, patrol. Qualify immediately. Write Rayson Service, B-32, Denver, Colo. ELECTRICAL SUPPLIES HUNDREDS of new and rare items, replacement parts and supplies. Send 10c for new, €0-page, wholesale cata- log. Autopower, 412-H $. Hoyne Ave- nue, Chicago. ENGINES, MOTORS, ETC. WINDING Data, 1000 AC motors, eight leading manufacturers. $1.00. Chas. Chittenden, Jr., Box 7631, Kansas City, Missouri. WINDING Data, 225 motors, single and three phase.’ Price $1.00. Motor Data Service, Box 7631, Kansas City, o. FIRE ARMS GUNSMITHS Secrets. Blueing! Checkering! Engraving, etc., 25c. Duffy-Co., Covington, Ky. FOR INVENTORS INVENTORS: Send immediately for your copies of our new Free books, “Patent Protection" and ‘Suggestions on Selling an Invention”. Sixty-eight pages of interesting facts. They tell how Patent Laws protect you; kind of sketch or model needed; simple steps to take without cost; how successful in- ventors have secured financial as- sistance; show interesting inventions; illustrate important mechanical move- ments. With books we also send Free Evidence of Invention form to help establish date of disclosure. Prompt service, reasonable fees, special de- ferred payment plan, Strictest secrecy. Thirty-six years’ experience. Highest references. Write us today. The facts in our books are worth money to the man with a good invention. Ad- dress: Victor J. Evans & Co., Reg- istered Patent Attorneys, 921-A, Victor Building. Washington, D. C. INVENTORS—Small ideas may have large commercial possibilities. Write us for FREE book, ‘‘Patent Guide for the Inventor" and “Record of Invention" form. Delays are dangerous in patent matters. Free information on how to proceed. Clarence A. O’Brien and Hyman Berman, 28-Y Adams Building, Washington, D. C. WE Successfully Sell inventions, pat- ented and unpatented. Write for proof, and tell us what you have for sale. Chartered Institute of American Tnventors; Dept. 5-B, Washington, INVENTORS—Sell before patenting. Free particulars Write W. T. Greene, 942 Barrister Building, Washington. D. C. FREE Information about new maga- zine for inventors who want more profit from their ideas. Write “Suc- cessful Inventions,” 801 Barrister Bldg.. Washington, D. C. INVENTION Finance Magazine, 80-H Wall Street, New York. Year sub- scription 60c entered upon promise to pay on receipt of first copy. GET Your Own Patents. Legal blanks, your inventions complete instructions $1. Cudding Sons, Campbell, California. FORMULAS SUCCEED With Your Products. Make-Sell Them. Formulas. Processes. Accurate analyses. Catalog free. A. Thaxly Co., Washington, D. C. 144 Accept No Substitutes! Eggs Fried Without Flame Over Magnet currents produced Electro-magnetic when this young lady held an iron frying pan over two powerful magnets was sufficient to fry an egg in a few moments. After removing the pan the magnets were inactive and could be touched without danger of burning the fingets although current was on. FORMULAS-—Latest money makers, Literature free. D-Belfort, 4042 N. Keeler, Chicago. 9,000 FAMOUS Formulas $3.00, 3,000 $1.00. 600-—25c. Voxco, B-933-X, Denver. FORMULAS—All kinds. Guaranteed Catalog Free. Kemico, 67, Parkridye Tllinois, 20 SECRET Money Making Specialty Formulas; 25c. Duffy-Co., Covington, y- . FROG RAISING “RAISE Giant Frogs”! We buy! Start backyard. Frogs sell up to $5 dozen, Free book. American Frog Canning Company (142-X), New Orleans, La. HELP WANTED—INSTRUCTION BECOME a Business Detective—make money in your spare time—pleasa:it work—good fees. Details Free. Busi- ness Detective System, 1009 Oak Street, Elmira, N. Y HYPNOTISM HYPNOTIZE Instantaneously! Learn how! Instructions 25c. Lonk Institute Hypnotism, D-1313, Palatine, Illinois. HYPNOTIZE Instantaneously — Con- trol Others. $25.00 Guaranteed Course $1. DeSala, Buechel, Ky. INSTRUCTION BE A RADIO EXPERT—Many Make $30, $50, $75 a week. Learn at home in spare time. — Radio's big growth mak- ing many good full time aud sparc time jobs. Write for Free copy of 64-page Book. National Radio Institute, Dept. 7AHA, Washington, D. C. INVENTIONS HAVE you a sound, practical invention for sale, patented or unpatented? Tf so, write Chartered Institute of Ameri- can oo Dept. 5-A, Washington, D. C. INVENTIONS WANTED SKILL and Science: Have you an idea for a new game of skill or science fot either public or homse use? We will buy outright or finance marketing of meri- torious presentation. No gambling de- vices. Will H. Wade & Co. (Invest- ment Bankers), 134 So. LaSalle, Chi- cago. SMALI, inventions wanted by manu- facturers. I'll help you scll your in- vention. S. Hull, 7829 Euclid Avenue, Cleveland. Ohio. INVENTIONS Commercialized, Pat- ented or unpatented. Write Adam Fisher Company, 582 Enright, St. Louis, Mo. MACHINERY FOR SALE RELIANCE Electric Pipe Thawing Machine — price $39.25, complete! Thaws out frozen pipes in 1 minute. Goll mine this winter! Write! Com- monwealth, Dept. P-709, Cincinnati, Ohio. MAGIC TRICKS & NOVELTIES MAGIC TRICKS, Joke Novelties, Puzzles, at lower prices. South's larg- est line, My famous Catalogue, “Book 1,000 Wonders” and ‘50 Mysteries Magic" postpaid 10c. Write today! You will be surprised! Lyle Douglas, Station A-14. Dallas, Texas. SOMETHING novel in ashtrays. Rich appearance, durable, an ideal gift. Black, brown, or gold. 35e each, 3 nins Delaco, 6 East 15, Wilmington, Del. MYSTIFY Your Friends—be a mind reader! Amazingly clever trick and catalog sent for 10c. National Magi- cians, 5712-G Woodlawn, Chicago. LEARN MAGIC — Large Illustrated Catalog of tricks. You Can Do. 25c. Holden. 222 West 42nd St., New York. "DON'T Miss This," 15e. C. A. Tlyde, Reading, Pa. 15 good tricks 537 Ritter St., MALE HELP—AGENTS 625,000 ARTICLES for sale cheap. List 10c. Duffy-Co., Covington, Ky. MALE HELP WANTED LOCAL AGENTS Wanted to Wear and demonstrate Free Suits to friends. No canvassing. Up to $12 in a day easy. Experience unnecessary. Val- uable demonstrating equipment. actual samples Free. H. Graves. Pres., 1300 Harrison, Dept. N-819, Chicago. MALE & FEMALE HELP WANTED MRS. M. earned $267, three weeks, raising musbrooms in cellar! Excep- tional, but your cellar, shed perhaps suitable. We buy crops. Book Free. United, 3848-A89 Lincoln Ave., Chi- cago. MALE INSTRUCTION DETECTIVES. Work home or travel. Experience unnecessary. Write, Ameri- can Detective Institute, 2640-T Broad- way, N. Y. Always Insist on the Advertised Brand!

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MIDGET AUTOMOBILES Com- BUILD a Midget Miller Racer. m plete plans for constructing this authen- tic midget automobile appear in the new 1936 edition of How-To-Build-lt along with many other interesting home and workshop plans. Send 50c for the 148- page book to Modern Mechanix Publ. Co., Greenwich, Conn. MISCELLANEOUS SPORTSMEN! Here's how to get the most out of your fishing, camping, and hunting trips. Follow the advice of America's outstanding outdoor writers; men who know and who have brought their years of research to you within the pages of the Sportsmen's Manual, 146 pages of unusual outdoor photo- graphs, plans and suggestions. Printed, throughout, in rotogravure. Send 50c for your copy. Modern Mechanix Publ. Co., Greenwich, Conn. IF YOU ARE looking for a repre- sentative in the Far-East, apply with full particulars to United Agencies, 244 Route Maresca, Shanghai, China. RECEIVE Gigantic Mails, magazines, samples. Your name in 1,000 mailing Jists—10c. Fairbanks Centerpoint, 100 Fo-svth. New York. DO YOU like Baseball? A game that's a hit. Manage your favorite team. De- tails ten cents coin. Jim Jordan, Staf- ford, Kansas. ` REBUILT Standard Size and New Portable 'ypewriters at bargain prices. Write for prices. Hoyt's Store, Sac City, Iowa. TRIANGLE Chart solves triangles hy inspection. Faster than Trigonometry. ge S Coated: P. O. Box 764, Detroit, ich. MEXICAN Curios, Christmas Novelty. Particulars Free. Samples 10c stamps. Apartado 1176, Mexico City, Mexico. BURIED Treasure Minerals, free book- let, photographs. Fisher, Palmer Bldg., Hollywood. MODEL RAILROADING BUILD a Model Railroad in 00 gauge (34 inch between rails). A complete catalogue of parts, construction kits, and completed units, One Dime. Nason Railways, P. O. Box 9, Mt. Vernon, N. Y., Dept. Xl. MODELS & MODEL SUPPLIES A PENCIL-LENGTH model locomo- live, authentic in every detail! Table top railroading is no longer the model- tnakers 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 railroad builders! supplies, also kits. “O” gauge, quarter inch scale. Freight car kits, $1.00. Loco kits, new low prices. Send 10c stamps for catalog SM. A. J. Volk, Montclair, New Jersey. BUILD a Model Railroad, the most fascinating hobby in the world. 24 page catalog 10c. Mention Modern Mechanix. Model Railroad Shop, Dun- ellen, New Jersey. When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions Spark Plugs Designed For Model Plane Use Here is a miniature spark plug that all model fans will welcome since it is just like the standard size product in ap- pearance and results. Designed by a leading manufacturer the tiny device will fire any model gasoline engine, whether it is for boat or airplane use. FREE: Illustrated circular. 40 engines. Locomotive castings. Sup- plies. Stamp required. Emco, 2417 N. Ashland, Chicago. ALUMINUM castings made to order. Lowest prices. H. Moore, Sutton Rd., Millbury, Mass. : —— MM Ó—ÓMM MONEY MAKING OPPORTUNITIES NEW, Original Money Maker. Guar- anteed to work. Details 25c. M. Williams, 504 Marion, Bellefonte, Del. MOTION PICTURE & SOUND EQUIPMENT GET our Bargaingram chuck full of real buys in Candid, Movie Cameras, films, projectors, screens; Silent-Sound 16MM film library. Brand new 8MM Movie Camera $9.95. Motor Projector $12.50. Trades accepted, bought. Mogull’s, 1944-M Boston Road, N. Y. LEARN Motion Picture Theatre Busi- ness. Home-study training: Manage- ment, Advertising, Projection. Free Catalog. Theatre Institute, 345 Wash- ington, Elmira, N. Y. MOTORCYCLES SEND 15c FOR ILLUSTRATED used Motorcycle catalog. Bargains. Largest stock genuine Indian parts and motorcycles. Indian Motorcycle Sales, Kansas Citv. Mo. RECONDITIONED Motorcycles. New and used parts for all makes. Complete service. Whitman Motorcycle & Supply Co, 405-9 Southwest Blvd., Kansas Citv, Mo. ALLOY Pistons. Harley, Henderson, Indian, Excelsior. Used parts, catalogue and wings pin 10c. Dallak, 1115 Chest- nut St., St. Louis, Mo. MUSHROOM GROWING MONEY IN MUSHROOMS! | Start now, in cellar or shed, get highest prices. Exclusive new process. Bigger, better, quicker crops. We buy. Book free. American Mushroom Industries, Dept. 801, Toronto, Ont. ——M—ÓM OFFICE EQUIPMENT TYPEWRITERS, multigraphs, address- ing machines, adders, dictaphones, dup- licators, sealers, folders. Save half, write Pruitt, 553 Pruitt Bldg., Chicago. Listing OLD GOLD WANTED CASH for old gold, teeth, watches, jewelry. 100% full cash value mailed day shipment received. Satisfaction guaranteed or articles cheerfully re- turned. Information free. Chicago Gold Smelting Company, 300-C Cham- plain Building, 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 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 inventors 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., Regis- tered Patent Attorneys, 920-A Victor Building, Washington, D. C. INVENTORS--Small ideas may have large commercial possibilities. Write ‘us for FREE book, “Patent Guide for the Inventor" and "Record of Inven- tion" form. Delays are dangerous in patent matters. Free information on how to proceed. Clarence A. O'Brien and Hyman Berman, 28.Y Adams Building, Washington, D. C. UNPATENTED Ideas Can Be Sold. We tell you how and help you make the sale. Particulars, with list of manu- facturers and wanted inventions, sent free on request. Write W. T. Greene, 958 Barrister Bldg.. Washington. D. C. “INVENTOR’S Guidebook” containing 96 mechanical movements and advice about patenting, selling inventions, also “Record of Invention", Free, Frank A. Ledermann, Patent Attorney-Engineer, 154 Nassau Street, New York. PATENTS PATENT Your Idea—Write immedi- ately for two free books, “Patent Pro- tection” and “When and How to Sell an Invention.” Fully explain many in- teresting points to inventors and illus- trate important mechanical principles. With books we also send “Evidence of Invention” form. Prompt service, reasonable fees, thirty-seven years’ ex- perience. Avoid risk of delay. Ad- dress: Victor J. Evans & Co., Regis- tered Patent Attorneys, 925-A Victor Building. Washington, D. C. INVENTORS—Small ideas may have large commercial possibilities, Write us for FREE book, “Patent Guide for the Inventor” and “Record of Invention" form. Delays are dangerous in patent matters. Free information on how to proceed. Clarence A. O’Brien and Hyman Berman, 28-Y Adams Building, Washington. D. C. 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. i 145

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OBTAIN Patents, 23 Lessons, $1.00. Free Lesson. Enclose Stamp. In- structor, 25 South Pearl, Youngstown, Ohio. PATENTS—Reasonable Terms. Book and advice free. n F. Randolph, Dept. 341, Washington, D. C. PATENTS WANTED INVENTIONS Commercialized. | Pat- ented or unpatented. Write Adam Fisher Company, 582 Enright, St. Louis, Mo. PERSONAL STUTTERING and Stammering cor. rected at home. Booklet free. Paul J. Wolfe, Box 52, Pittsburgh, Penna. ài PHOTO DEVELOPING DEVELOP and print your own pic- tures, Save time, money with our com- plete $1.49 outfit postpaid. or pay post man $1.55 COD. Includes electric ruby lamp, printing frame, photo paper, chemicals and equipment. One of hun- dreds of amazing bargains in our Free, newest, money-saving Bargain Book. Send for it today! Central Camera Co., 230 So. Wabash, Dept. 21-], Chicago. FINER Finishing. Rolls developed and printed, with One Colored enlargement, or two professional enlargements. All for 23c (coin). Genuine, Nationally Known, Moentone Superior Quality. Moen Photo Service, La Crosse, Wis. FILMS Developed. 25c coin, Double Weight Professional Enlarge- ments, 8 Gloss Prints. Club Photo Service. LaCrosse. Wis. ENLARGEMENTS. 8x10 Double- weights, 25c. Cardinal Photo, Berkley Flights, N. T FlLMS finished 15c. 116 and larger 20c. Photo Service, 644 Genesee Ave., Morrison, Ill. POCKET RADIOS FREE “Pocket Radio". Particulars, catalogue, 10c. American Business Service, Shamokin, Pennsylvania. POULTRY POULTRY TRIBUNE — America's leading poultry magazine. i $1.00; one year trial 25c. Tribune, Dept. 92-C, Mount Morris, Illinois. AS WORLD'S Largest ducers, we can save you money. Big Catalog Free. Colonial Poultry Farms, Box 446, Pleasant Hill, Mo. PRINTING PRINT your own cards, stationery, circulars. advertising, etc. Save money. Easy rules furnished. Print for others. big profits. Junior press, $5.90; job presses, $11; power, $149. Write for Chick Pro- details. Kelsey Co., S-57, Meriden, Conn. PRINT 250 envelopes, letterheads. business cards, or statements—$1.00 postpaid. Globe, Pottstown, Penna. DISTINCTIVE Printing—Free sam- ples. Jackson Co., Harding St., Fall River, Mass. 250 BOND letterheads or envelopes $1.00. Woods Press, Bedford, Penna. PROPELLERS PROPELLERS, Sled, Lightplane, lowest prices, literature 6c. Woodcraft Propeller Co., Hillside Station, Wichita, ans. RADIO & TELEGRAPHY CRYSTAL Set—4,250 Biueprint 18 Distance *Radiobuilder" year—25c. tories, 151-K Liberty, San 146 mile record. Models with Labora- Francisco. Accept No Substitutes! Instrument Measures Two Millionth Of Inch Capable of measuring to two-millionth of one inch this instrument, known as a Johansson gauge, is used in manu- facturing precision automobile parts. Errors 1500 times smaller than a hair can be detected by this vernier gauge. 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. RADLIO 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. MATCH Box Pocket Size Crystal Radio. Amazing Reception, Complete 50 Cents (Coin). Sampeitro's Shop, 104% Balbo Avenue, Providence, R RD 4 TUBE $8. Ballard’s Radio Co., Sapulpa, Okla. —————— SALESMEN WANTED MANUFACTURE and Sell Your Own Motor Overhaul Compound-Expanding Mineral Supplied. Make as easy as a cup of coffee. Clean up with world's fastest selling Specialty; Formula and enough Mineral to start business One Dollar. Xrelite Mines, Kalispell, Mon- tana. NEW Dryeleaning Clothes Brush. Revolutionary invention. Cleans clothes like magic. Homes, offices buy in- stantly. Phenomenal profits. Outfit Free. Kristee, Dept. 262, Akron. Ohio. GOLD Reflecting Letters for store windows. Easily applied. Large sizes, penny each, free samples! Atlas Sign Works, 7941-G Halsted, Chicago. SELL Men's Neckwear—regular $1 sellers cost you $3 Doz. New Fall Line. P. Zehnder, 497 S. Main St, Phillipsburg, N. J. SIGN PAINTING Painting taught by successful sign painter. Send dime for literature and terms. James Meagher, 71 Dun- ham St, Norwich, Conn. SPECTROSCOPES SPECTROSCOPE with book of 120 experiments, $2.50. Cudding Sons, Campbell, California. SIGN * TATTOOING SUPPLIES TATTOOING Outfits, Supplies—Cata- logue. Guaranteed Remover. “Waters,” M-965 Putnam, Detroit. TAXIDERMY SUPPLIES FREE Official Catalogue. Big values. Eyes. Head forms. Everything, direct from manufacturer. Taxidermic Manu- facturers, Memphis, Tenn. STEER Horns seven feet spread for sale. Lee Bertillion, Mineola. Texas. TELESCOPES. MICROSCOPES, ETC. GET our lowest prices on Telescopes, Microscopes, Moyie Cameras and hun- dreds of other items. Catalog free. D. Winn, 124 W. 23 St, New York. TELESCOPES, Microscopes, Binocu- lars. Lowest prices. Optical catalog free. Brownscope Company, 234 Fifth Avenue, New York. BUILD vour own Reflecting Telescope. Copy of instructions ten cents. _ Cata- log Free. Optical Laboratories, Larch- mont, New York. BUILD 6" Reflecting Telescope. All optical parts, with silvered mirror and machined castings. C. Lutts, Norwalk, Ohio. . FREE! Bargain Catalog. Telescopes, Microscopes, Binoculars. 'Teeko (1515-K) Evanston, Illinois. FREE literature, Amateur Telescope Makers Supply Co., 24 West 20 Street, New York, N. Y. VENTRILOQUISTS LEARN Ventriloquism by mail; small cost, 3c stamp brings particulars. Geo. W. Smith, 125 North Jefferson, Room $-656, Peoria, Ill. WELDING DODGE Arc-Welders! Install heavy duty brushes, Guaranteed to satisfy and increase output of any kind of Dodge Arc-Welder. Brushes 50c each postpaid. Welders’ Club of America, 3432 Drake, Chicago. NEW and used Acetylene and Electric arc welding equipment at special low prices. Write Alex Adastik, 1299 Michigan, Grand Rapids, Mich. DODGE Arc-Welder, 25-200 amperes. Build it yourself. Certified Plans $1.00. Welders’ Club of America, 3432 Drake, Chicago. ARC-WELDING Outfit $1.25. Weld fenders, braze, solder. Lavrow, 4368-W, Warren, Detroit. Stamp appreciated. WIND ELECTRIC LIGHTS ELECTRIC Light-Wind Driven, auto- matic control, build your own electric lant. Copyrighted Blueprints. Write Wind Motor Electric, Brainerd, Min- nesota. WIND ELECTRIC PLANTS GENERATOR Propellers, expertly de- sigued at factory prices. Hibbs, Fort Worth, Texas. WOOD CARVING "MODERN Wood Sculpture," complete instruction book on carving Statues $1.00. Lee, Wood Art Studio, Dept. 3, Centerville, Ia. Always Insist on the Advertised Brand!

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Operates Wi hou ubes, Batteries or Electric Connections Amazing midget radio fits in pocket or purse. NEW MODEL weighs only 2 ozs. as shown in ACTUAL photo! Smaller than a cigarette pack- age! Separates and receives all stations wlth beautiful clear tone. Range to 50 miles—MUCH GREATER under good condi- tlons—no static or noise! Not ing to wear out—only one moving part—will last for years. NO CRYSTALS to adjust. Has NEW b TYPE sensitive rectifier and hi-ef ciency design ENTIRELY NEW!! Not to be confused with cheap im. tations. Tunes broadcast band and POLICE and AIRPLANE CALLS! NOT A TOY, but an unusual practical radio—a sensation everywherc—a delight to anyone everyway. Comes In several beautiful colors (state yours) ABSOLUTELY COMPLETE ready to listen with midget phone and instructions to use in hotels, offices, autos. trains, camps. at home, In bed, on bicycles, at sea or wherever you may be. TAKES ONLY A SECOND TO CONNECT—no messy hookups. THOUSANDS OF SATIS- FIED OWNERS—many report wonderful service in ALL PARTS OF THE WORLD! THESE ARE FACT Carry one with you always and be assured of many hours of enter- tainment AT NO COST! Can be used by ANYONE—even a ! Send only S1. QUO Pay resumen. balance or send (M Cash, Check) PAY POSTAGE. GUARAN- D. A most unusual value. Foreign orders 75¢ extra. TINYTONE RADIO CO., Kearney, Nebr. BUILD YOUR OWN RADIO Radio Builders? Manual contains 148 pages of instructions for constructing all-wave receivers, short-wave converters, automobile radio, and many other radio devices. Send 50c for your copy. MODERN MECHANIX PUBLISHING CO. GREENWICH, CONN. WHIZ Electric Tool real professional b of ONLY g, grinding, B, routing, san $5.95 95 Powerful—Speedy—Dependable Speeds up hundreds of jobs for shop and home, Needed by every craftsman, Mechanic and carpenter. Full size uck. 14 capacity, geared to extra powerful motor. Self-enclosed fan prevents overheating. Ball bearing thrust. Pistol grip with thumb switch. Universal motor for A. C. and D. C. Money-back guarantee. FREE— set of sanding discs, mandre! and drills with each, WHIZ tool. Complete outfit, postpaid, at the low price of only $5.95. Order D Paramount t ProductsCo Dept. 2B, 245 B'way,N. Cards, stationery, advertising, labels, paper, circulars, tags, etc. Savemoney and time. Sold from faclory only. Junior Press, $5.90. Job Press, $11, Power, $149. Do popular raised printing like en- f our pre A for Oth for itself in a short time. rules sent. Write for free catalog of outfits and ail details. The Kelsey Co. K9, Meriden, Conn. Good positions for trained men and women in hotel, club, restaurant and institutional fleld. Previous experience proved unnecessary. Qualify in FOUR MONTHS—learn on real hotel equip ment, under expert instructors. tional Placement Service FREE of estra charge. Day Classes start Jan., Feb., Sept., Oct. Catalog FREE! LEWIS HOTEL TRAINING SCHOOLS Division RPA-9134 Washington, D. C. 60 POWER TELESCOPE $2.29 VARIABLE EYEPIECE. 20X—40X—60X NEW! Three telescopes in one. 3 different mag» © nifications. 20 power for ultra-bright images with 40 and 60 power, for extra long range. Guaranteed to bring distant objects, people, sports events, ships, moon, etara, etc. 60 thes as close. Most power = ful made for any vhs ero —_ " near the money. Can be collapsed to less than a foot in length. Multiple lens system. JO mm. objective, In heavy brass mount. Directions included for uelng as a compound 4 lene microscope. American made. We pay the postage. Only $2.29. EROWNSCOPE CO., Dept. 71, 234 Fifth Ave., New York, N. Y, Practical, useful inventions may now be safely marketed without pateuting expense. Write for proof tbat we suc- cessfully sell boih patented and unpatented inventions. Chartered Institute of American Inventors Dept.5, Barrister Building, Washington, D.C. When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions Learn the best-paying technical trades by most modern training methods right in the heart of filndom—LOS AN- GELES. National Schools fs the oldest, Jargest trade school In West— 30,000 graduates. Latest equipment. Complete Instruction in Talking Pic- ture operation, Radio Transcription, Recording, Broadcasting, Televison and complete Radlo training. NATIONAL SCHOOLS Unlimited opportunities for prop- erly-trained men. Earn room and board while learning. Coach R. R. fare allowed to L. A. Send for Free Book REQUEST FOR BOOK NATIONAL SCHOOLS Dept. I-MMR, 4000 So. Figueroa St., Los Angeles, Calif. ADDRESS [ t ‘ i + 1 ! 1 1 i i k t CITY BEAN ARTIST = WE CAN TEACH YOU DRAWING in "Ww your own home during your "w Spare time. Thirty-five years of — ^w Successful teaching proves our ability. Artists receive large salaries. Write today for Art Year Book ScH@L“APPLED ART Dept. 617, 10 E, Huron St., Chicago, Ill, Squab Book for 1937. (Send 3-ct. U S E stamp for mailing ex- M) pense.) Quick cash for 1 ox. P these ROYAL baby : birds; orders waiting for hundreds of thous sands from the largest, most reliable N. Y., Chicago and other city marketmen whose names we give you. Breed them; Sold only 25 days old. We ship breeders everywhere. See any tank about our responsibility. Write PR Company, 602 H. St, Melrose, Massachusetts, and get going on this job, ELECT Rig, -. STATE .. RADIO REFRIGERATION: feta On ELECTRIC POWER -in Spare Time at Home 7 uci Practical Shop Methods eH c New eas; TE to prepare for jobs leading to salaries of $30,$46,$50 a week. Opportunities to earn $5—$10 a week and more while training. Learn by doin ng actual jobs in your own home electrical shop. Electric Equip- ment and Apparatus supplied at no extra cost (E ake f training practical. No previous experience or advance Šal gagat on nec rete ney back if not aotisfled. Write for OOK we cts and Opportunities for you es a trained Pebereal Man. i ELECTRIC INSTITUTE .H. W. PETERSEN, President Hinsdale, tiunos I Dept. 47-A i NAME AGE STATE STREET. CITY. A A A €—————— 147 i J [| l ! 1 al

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WITH THE HOBBYISTS Using nothing but a type- writer Ben C. Woodall of Buffalo, New York, has pra- duced striking type portraits of famous people, two of which are shown above. Many of Woodall's portraits Ed Hadley, left, a husiness man of Casper, Wyoming, claims the distinction of possessing one of the most unusual of all stamp collec- tions. The body of his car is the album for more than are autographed. His prized ones include Fred Astaire, Herhert Hoover, Ben Bernie, Clark Gable, Rudy Vallee, Walter Winchell, Katherine Cornell, Howard and Jane Thurston. Claudette Colbert and others. Wallace Beery and Dolores Del Rio’s por- traits appear above with their creator shown in the circle. 10,700 postage stamps. Mr. Hadley engaged the services of five girls who worked six weeks pasting the postage stamps on the body, head- lights and fenders of the car. Henry Reider, left, member of the University of Nebraska Museum Staff spends his spare time gathering bones from prehistoric animals for use in making unusual musical in- struments, He is shown with a xylophone which he made from rhinoceros rib bones. When not on duty Harold Robinson, a Greenwich, Conn., traffic officer, operates ama- teur radio station WIBUN, communicating with fellow amateurs in all parts of the United States and Canada. Robinson along with other Eastern amateurs played an important part in handling messages from the flooded areas of New England last spring.

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Foreign Stamps Commemorate Statue of Liberty America's famous Statue of Liberty which on October 28, 1936 celebrated its Fiftieth Anniversary is not only pictured on the United States fifteen cent stamp, but on the stamps of four forsign countries as well. honored the world famous statue with special stamp issues, three of which are shown here. U. S. stamps the government has limited its use to the black fifteen cent issue. France, Spain, Uruguay and Peru have Although suggested for other The statue, which stands in New York's harbor, was presented to the U. S. by the French people in appreciation of assistance rendered them during the Franco-Prussian War. ADLETS FOR HOBBYISTS (See regular classified sectlon for rates and other Information.) STAMPS $2,000.00 for lc. We Guarantee to Pay World's Highest Prices, Large Cents up to $2,000.00 each 1909 Cents $10.00, 1860 Cents $50.00, 1890 Cent $20.00, 1913 Liberty Head Nickel $350.00, 25c before 1916 $300.00, 50c before 1916 $750.00, Other 50c before 1936 $60.00. Gold Coins $5,000.00, Lincoln Cents hefore 1932, Half Cents, Half Dimes, Foreign Coins, Paper Money and "Thousands of Others to $2,500.00 each. Know What Your Coins Worth, Send Dime For World's Largest 10c Complete Illustrated Catalogue. Romanocoinshop, Dept. 159, Nantasket, Mass. SUPER-WONDER Packet offered, containing 60 different Stamps from Afghanistan, Transjordania, North Borneo, Manchukuo, Sudan, Macao, Iraq, Charkhari, French and British Colonies, including natives, beasts, ships, etc., all for 5c to approval applicants. Big illustrated lists included. Kent Stamp Company, Box 87-Z (G. P. O.), Brooklyn, N. Y. 50 DIFFERENT Stamps cataloging over $1.00 only a dime io approval applicants. 20,000 different stamps at prices ranging from lc. All stamps guaranteed genuine. A fine selection of U. S. revenues at 1c and up. Address F. G. Stein, Dept. 214, 7360 N. Seeley Ave., Chicago. GIANT Netherlands Commemorative Triangle, Jubilee, Air- mails, Pictorials in Mammouth Collection—10c¢, with Dcuble Premium Approvals. Free Airmail Collection given regular customers. Tru-Value Stamp Service, Box M1412, Hart- ford, Connecticut. BRITISH TURKISLANDS—Also Congo’s—Montecarlo—- Nigercoast— Uganda—Djibouti— Ecuadorian — Ivorycoast — Ubangi—Countries collectors need. Free for 5c postage. EMPIRE STAMP SHOP, Dept. MM., TORONTO, CANADA. NEGRI Sembilan, Siberia, Bicolored Columbian Airpost, Cheery French Colonies, Beautiful Trinidad Pictorial, Scarce Perak. Everything Se with Approvals! “Saxon”, Albee Bldg., Brooklyn, N. Y. LARGE SPANISH Ship stamp. Azerbaijan, Cameroons, Chad, Dahomey, Ubangi in packet of 57 stamps. All for 5 cents with approvals. Swedell, 3129 Garfield Ave., Min- neapolis, Minn. 107 DIFFERENT, Gabon, Congo, Algeria, Guinea, etc., 5c to approval applicants. Extra—Airmail Packet Freet! Hunziker, Box 225W, Minneapolis, Minnesota. STAMPS! 100 diff. 3c; 500 diff. 35c; 1,000 diff. 90c! Ilustrated Album (4000 spaces) 22c. Approvals sent. Tatham Stamp Co. (D9) Springfield, Mass. MONTHLY Stamp Magazine, 6 months and 25 foreign stamps, 25e. American Stamp Journal, Cedar Rapids, Iowa. FREE! postage. 15 different Peru to approval applicants, enclosing William Ranson, 3555 Fullerton, Chicago. FREE!!! King George Memorial Packet, 15 varieties, Post- age 3c. Roberts, 901-T Fourth, Baycity, Michigan. UNITED STATES—Elaborate Pricelist free. 10c. 75 different 30c. Sidenburg, 45 different Baroda, Mich. 400 DIFFERENT British Colonials with Jubilees $2.00. Sanders, 90, Newlands, Southampton, England. VALUABLE Information Free!! No approvals. Postfach 20, Porzellangasse, Vienna, Austria. CUBA and Latin-America Approvals. M. F. Melendi, Apartado 2511, Havana, Cuba. COINS $5.00 TO $500.00 EACH paid for Old Coins. Keep all old money. Get posted. Send 10 cents for Illustrated Coin Value Book, 4x6. Guaranteed Buying and Selling Prices. Coin Exchange, Box 17, Le Roy, N. Y. COMMEMORATIVE $%s. Lincoln, Texas, San Diego, Oregon, $1.50 each. Illustrated Catalogue 25c. Norman Shultz, Salt Lake, Utah. Collector, FREE: Foreign Coin, Banknote and Large Tllustrated coin catalogue, for 4c postage. Approvals sent. Tatham Coinco, Springfield-9, Mass. COINS, Beadwork, Indian Relics, Minerais, Books, Curios, monde Catalogue, 5c. Indian Museum, Northbranch, ansas. INDIAN CURIOS CORP REM indubie ota ia Sieht MR e M MN 15 ARROWHEADS, Spearhead, Lancehead, gempoint 99c. Firearms. 120,000 Bargains. Photolist 10c. Museum, Rutland, Illinois. When Answering Advertisements Please Mention January Modern Mechaniz Hobbies and Inventions 149

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HowTo Secure À Government Position worry about strikes, layoffs, hard times? Train now for a Government job. arles steady work, travel, good pay. Let m ts ome a Railway Postal Clerk, Post Jork, City Mal Carrier, Rural Carrier—or help you get any position in Government Classified Service you wan was a Secretary Examiner of Civil Service Commission for 8 years. My coaching nae helped thousands. FREE BOOK. 22-pase book telis about Government jobs — and how my instruction helps to qualify you to get the one you want. Send for a free copy TODA Fani ae einen —— aae, e

A. Patterson, Civil Service Exp: a PATTERSON SCHOOL, 431 Case ida., Rochester, N. Y. Send, without obligation, free book “How to Secure Government Posi- Name

@ 1f you want to be really popu- lar, have ail the fun, the center < Of attraction everywhere, just learn to play this thrilling instrument from Italy. A complete band or orchestra in itself, and Bo easy to learn to play. You'll master this easier Soprani in no time, and you’ll have real fun from the start. Don't delay. Big future. Send postal for beautifully illustrated literature. No obligation. Easy terms. Write today sure. 122 SOPRANI, IN C. pEPT. aao ME AVE. “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 youc own? Send 50c today to MODERN MECHANIX PUBLISHING CO. GREENWICH, CONN.

Protect the future profits from your idea by securing a U.S. Patent. Delays are often dan- gerous. I give prompt and personal attention to f your case—nothing is entrusted to unskilled assistants. The Patent Office itself urges you to select a Competent Registered Patent At- torney in order to protect your interests prop- erly. Therefore, before doing anything else, sendformy NEW FREE BOOKandget the full facts, and with it I will send you my FREE "Record of Invention" form. All correspond- ence strictly condJential, Mail Coupon TODAY

1727 International Building WASHINGTON, D. c. Il i Plase send immediately your FREE book and Record of Invention M Fora. || L| Name...... e reto ce A LE i Address. . cc cccccccccscccccenevececssvecsesevereces I CU PEE s hh he rre esie agree ooo Da mm um um x. RE UR EE NEN UR US Gs ER e um Gm UO m o] 150 Accept No Substitutes!

Great Inventions [Continued from page 138] inventors, they loom large in comparison with others of her sex. Less than two per cent of the patents have been granted to women—a propor- tion practically constant since 1900. In every branch of sport may be found famous athletes who have succumbed to the inventive urge. Walter Hagen patented a golf ball having a surface design which, he claims in his patent papers, makes the ball "accurate in flight as well as in putting and rolling." Rene Lacoste, internationally known tennis player, has patented numerous inventions in racket structure. Sandow, the “strong man,” devised a strength-measuring apparatus and pat- ented it. In baseball, plaver-inventors are almost as common as player-managers. If you have ever seen Max Carey, formerly of the Pittsburgh Pirates, slide into a base, you may have won- dered what saved his hide. Well, Max always used a special sliding pad which he himself in- vented and patented. On the other hand, the late Benjamin Shibe, owner of the Philadelphia Athletics, patented a mass of inventions on player equipment, in- cluding baseballs and baseball-making ma- chinery. Thomas Shibe, late president of the Athleties, and John Shibe, now president of the club have both contributed inventions along the same line. In fact, it is under the Shibe patents and in the Shibe plant that the balls used by the American League are manufactured. Charles Brickley, former Harvard football star and All-American fullback, is said to have been the greatest dropkicker of all time. He wore a patented shoe of his own invention. From the side lines the coaches give thought not only to the plays, but to the equipment needed by the players. For instance, we might mention Glenn S. ("Pop") Warner, dean of coaches, whose patents include a "shoulder pro- tector." Around The World By Air [Continued from page 53] especially at high altitudes. A remarkable de- velopment in aviation which was not available until a few years ago is the "gear shift of the air"—the controllable pitch propeller operated from the engine oil pressure. And there are the new drives to operate vacuum pumps used to actuate retractable landing gears. I marveled as I sat in the control cabins of airplanes and as great areas of geography were left behind beneath us I learned of down-draft carburetors, wing de-icers, the complete shielding of the ignition wiring system to prevent interfer- ence with radio reception, and many other avia- tion achievements. [Continued on page 153] Always Insist on the Advertised Brand!

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d west eo — qe17 ematie . qan EAS et ern Yon" Wause id qi gconet® girs: ed M ang jut oem, ast paving TT nice? re 08 ange m em e qacu-o> e pt equiPP. you bg a 9 nough' Ang! e rearing ba ut oth With g vacu E. new mileage records on cars in all sec- tions of the country, the Vacu-matic again scores in à new speed record established by Bob McKenzie transcon- tinental automobile champion. Los Angeles to Chicago — 2,322 miles in 39 hours and 42 minutes— driving 75 and 80 to maintain a speed average of 59.7 miles per hour! Here is speed—a gruelling grind—where quick accelaration, greater top speed — and less stops for gasoline mean those precious moments saved that make new speed records possible The same Vacu-matic that helped Bob McKenzie establish this speed record and gave him such fine gas savings is now available for all car owners, It is positively automatic—simple to install—inexpen- sive—and pays for itself many times over in gas savings Qitsmaliéd -- Nothing Like It! Vacu-matic is entirely different! It operates on the super- charge principle by automatically adding a charge of extra oxygen, drawn free from the outer air, into the heart of the gas mixture. It is entirely AUTOMATIC and allows the motor to “breathe” at the correct time, opening and closing automatically as required. No idl- ing troubles—no carburetor adjust- ments necessary. It is so simple it will amaze you—so practical it will save you many dollars on gas costs. Fits All Cars VACU-MATIC is constructed of six parts, assembled and fused into one unit, correctly adjusted and sealed at the factory. Nothing to regulate, Easily attached in ten minutes. j The VACU-MATIC Co. Wauwatosa, Wis. Agents and Salesmen VACU-MATIC offers ~a splendid opportunity for unusual .sales and profits. Valuable terri- tories now being as- signed. Check and mail coupon. When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions Guaranteed Gas Savings VACU-MATIC must prove itself on every car. guaranteed to give worthwhile gas savings, quicker pick-up It ís and more power, or it costs you nothing, "On my V-8 Ford it works miracles”, says Ralph Fields. James Seeley —"'On an International Truck on a round trip to Cleve- land, 385 miles, it saved 19 gallons of gas.” A. V. Grove —"On the Buick it showed 5 miles more per gallon." F, S. Peck—"I average 22 miles per gal. on my Plymouth, an increase of 7 miles, for a saving of $15.00 a month, or $180.00 a year.” Wm. Lyons—" Averaged 25 miles on a gal. with a Model A Ford at 40 miles per hour.” Free Details You owe it to yourself to know all about this remarkable discovery. Mail the coupon below. Start saving gas with VACU-MATIC and enjoy a new driving thrill! "There's no obligation—so get the facts now! Write today! - e =FREE OFFER COUPON = > œ THE VACU-MATIC COMPANY 1617-271 W. State St, Wauwatosa, Wis, Gentlemen: Please send me full particulars concerning the 3 Ü Vacu-matic and details of your Free Offer. "This of course a does not obligate me in any way. dc L] Name .......eseeee e seseeeee eost eroesosetesosbuoi essen esos States ccce cene ooo E] Check here if interested In selling proposition. = - m m e SSS eS A 3 g m) 151

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$752 LESS MOTOR DRIVE : | $6.50 a Month B No. 415-YA 914” swing by 3' bed Workshop Bench Lathe with AN IDEAL XMAS Horizontal Motor Drive, 14 h.p. Reversing Motor, Switch and belt tension countershaft as shown above .................. $104 (828 Down, $7 amonth for 12 months) 4 HE new 1937 model 9-inch Workshop Lathe i Back- E A : ayee Geared Screw Cutting Precision Lathe n with Twin Gear Re- § OTHER SIZES verse to lead screw, Ball Thrust Bearing on Spindle, Longitudinal 2 115, 18", 15, 1 Screw Feed to Carriage, Precision Lead Screw for cutting screw : T m ee threads—and scores of other important features. SWING. ' Especially recommended for fine accurate work in the plant, -IN ALL BED shop and toolroom. Used by all important industries in this _ 3 i 'HS : country and abroad. Takes 38 practical attachments for milling, L NGT S. grinding, draw-in ‘collet CC PRICED chuck work, and many other 3 g manufacturing jobs. Write for Catalog 15K, illus- trating and describing the new 1937 Model Workshop Lathe in 8 different drives— 4 bed lengths. Shows the 38 attachments for use with thislathe. A valuable book- let to anyone interested in metal working lathes. Use coupon below. SOUTH BEND LATHE WORKS 514 E. Madison Street South Bend, lnd., U.S.A. No. 192-C 16" x 6' South Bend Quick i Change Gear Underneath Belt Motor Driven Lathe with 3-phase motor, re- versing switch, complete as shown. nmt oA " "iu ui art Fee US 1081 OF for 17 months) i Soest eJ eus P jon wpe eet i 1 ur of otk - : — . qose n B ove P 152 Accept No Substitutes! Always Insist on the Advertised Brand!

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Around The World By Air [Continued from page 150] The down-draft carburetor guarded against dirt getting into the engines by taking the car- buretor intake air from the top of the motor in- stead of at the bottom where great clouds of dust were churned up when the plane taxied along the ground. "a To attempt to look ahead in the aviation indus- try literally takes one's breath away. I thought, as I traveled, that I was flying in the last word in heavier-than-air planes. Now I am learning of engines of 1,000 horsepower. More than 600 Wright engines of 1,000 horsepower have been ordered by the United States Army Air Corps for the new Boeing and Douglas bombers now being built to increase the strength of American military aviation. These new power plants have a fuel consumption which closely approaches that of a Diesel engine. The Dutch have ordered new airliners to be equipped with 1,000 horsepower engines. American Airlines and TWA will use them in this country. Behind the scenes in all these development are advances in manufacturing. One of these revealed to me was the nitriding of the interior of cylin- ders in which the pistons move up and down. As the results of nitriding, the hardness of the cylin- der interiors has been increased three times. They become so hard they will cut glass. This, of course, means that the cylinder walls have great wear resistance and will last materially longer. Then there is magnafluxing. Manufacturers, after machining and polishing each steel part for an airplane motor—magnetize it. Then they immerse it in an oil solution which has fine iron particles kept in suspension by an air agitator. Jf there is a surface crack or defect in the steel, the edges of the break form the two poles of a magnet and attract the iron particles. Hence, the break is shown by a thin black line. Defects which might not be discernible even under a microscope of 10 to 20 diameter enlargement strength are clearly shown up in magnafluxing. Materials fo MM Homes [Continued from page 39] cellar. Mary felt that they should have real ground-breaking ceremonies, like those which are held for million dollar public buildings. The event was going to be that important to her and Tom, anyhow! (To be continued next month) MM HOME BLUEPRINTS Four sets of complete working blueprints and specifications, ready to turn over to a contractor after advice from a local architect, can be obtained for $25.00 for either the $3,500 or the $5,500 home. Address orders to Modern Mechanix Publ. Co., Fawcett Bldg., Greenwich, Conn. When Answering Advertisements Please Mention January Modern Mechaniz Hobbies and Inventions This | MACHINISTS’ | Home-Study Course helps men get ahead Newly assembled—specially priced—these five recent books give you the practical facts on modern machines, up-to-date methods you heed to advance in machine shop work. Take advantage of the other man’s experience as found in books, to solve your problems, increase your efficiency, with the new Library o£ Modern Machine Shop Practice 5 volumes—2000 pages—1600 illustrations (A combined home-study course and reference library) This library of machine shop practice was written for practical men. Jt gives you the best methods for every kind of machine shop work. it deals fully with lathes, drills, and other machine tools and their Operation, automatic screw machines, speeds and feeds, gear design and Production, punch and die work, metal finishing, etc., etc. Plainly written—completely illustrated—the best kind of help to the machine-shop man who wants to advance himself. No money down—special price—easy payments [FREE EXAMINATION COUPON} J McGRAW-HILL BOOK CO., Inc., 330 W. 42nd SL, NEW YORK, N. Y. Send me for 10 days’ free examination the Library of MODERN | MACHINE SHOP PRACTICE. If satisfactory I will send $1.50 In ] J O days and $3 monthly until the special price of $16.50 is pald. if not wanted, I will return the books Rostpaid. (To insure J prompt shipment write plainly and fill in all lines.) Name ] Address City and State Position p Company c.--ulcsnenelcloolloelwsemueumme ccu MMx-1-37 Lt M——M sal POWER Courtesy DIESEL POWER A Great American Industry The internal-combustion engine represents man’s gu- preme triumph of machine power. Expert Diesel opera- tors are in demand. Here is real opportunity for mechan- ics, draftsmen, owners of shops, motormen, farmers and all others employed where Diesel replacements will be made. Get this knowledge. Send for FREE booklet. R A DIO holds rich rewards for trained men The big opportunities in Radio will be enjoyed by trained men. The International Correspon- dence Schools Radio Course, prepared by leading authorities and constantly revised, will help make you a trained service man! A fascinating book — FREE. INTERNATIONAL CORRESPONDENCE SCHOOLS Box 2322-K, Scranton, Penna. Please send information on course checked. O DIESEL POWER O RADIO C Automobile Course Li Air Conditioning O Mechanical Engineering Li Aviation Engines Name Age Address 153

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čıpandinçKusiness pues huy Jetoas ganea Mt Aiciu Slicing edig Samuel Bell = Raitt ix Coan foil This machine will dice. fruit in one operation of the foot petal. the top and a die at the bottom. Each operation requires a die. slice, or shred any vegetable or A punch is set at A universal welding generator that welds all thicknesses of plate from one-sixteenth to six inches and metals such as steel, copper and aluminum. A new type window lock that has a bolt and latch combination that can be safely locked with a special key. A kerosene stove designed for keeping auto engines warm in cold weather that operates at a cost of about two cents per day. A speciall de- signed vacuum cleaner for auto- mobile use in which the dirt is collected in an easily emptied metal . container. Operates on AC or DC current. Small in size, it is con- veniently carried. This oscilloscope enables music studente to see as well as hear A coffee roaster that enables the music sounds. Sound wave pat- tern is traced on a smal! screen. 154 product to be freshly roasted at the point of sale. Hexagonal pack- ages designed for convenience in storage. A portable dance ‘‘flooretie,” a folding minia- ture floor that can be laid on top of rugs., A machine safety guard that gives double pro-. tection to the op- erator because it has both a stationary À new soap pulverizer for lavatory use which, at the twist of.a crank, converts a cake of fine, milled soap into a pulverized form and feeds it to the hands of the user. Attached in three minutes, this de- vice converts an outboard marine motor into an efficient water pump suitable for use at hoine or camp. and a sweep guard. An automatic welding torch lighter that oper- ates on 110 volts or less and which lights the torch when a magic button is touched with the torch tip. Án x-ray projecting machine that enables a dentists patient to view his teeth defects on an enlarged scale upon a screen. À new mechanical color analyzer that reduces all hues to plain black and white of different densities and translates color shades into curves plotted on graph paper. A new electric light bulb has a special glass that filters out rays harmful to eye nerves. The vibrating spindle of this valve seat grinder lifts the stone from the seat each revolution, throwing off waste particles in revolving. Editor's Note—Addresses of manufacturers of these and other new products in this issue can be obtained by sending a stamped, self-addressed envelope to Modern Mechanix Publishing Co., Information Bureau, Fawcett Building, Green- wich, Connecticut. Manufacturers are invited to submit material for publication on this page.

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e E, SMITH, Pres.. atl, Radio Institute man who dustry than any other, man in = America. ERE'S PROOF casting erator Broa! Chiet Op Station ME tea 30 lessons, T007 when I [n Broadeast Operon i y " in tained "immediately fenior Onera- ; al S. 85 Madi- «lg. HAYES, 85 LLIS, P gon Ste Lapeer, EN i Week in Spare Time work has consisted of servicing, with somo Publio want Systems work—all in my spare time. Ny earnings in Radio amount to about | week." WILLIAM TOS Hidge Road, Hoberh dnd Do Service Manager For Four Stores ina gane when X vith N. R. L In ext ih, otia fo o fr ds rse three or four 5 counie ferrieo manager fos he eor PONES GooRYAN, 1535 Slade St. Fall River, Mass. eg was working Own Business P. u Month: $300 "I now haye my own R: ^ : adi ines; whiten shows three fundred qose eth Profit—thanks again to National Radio.” —FRANK T, REESE Folton St, Philadelphia, Pena ^" 650 First Month Earned E in Spare Upon Aes ing about Radio. At ay knew nothing fn servicing Radios. four lessons i sgan Ser month. i I made, is hish, ene pont i me.?—G. F. WALT in eR Saney Road, ‘Norfolk, Va. THE TESTED WAY TO | Will Train You at Home— mail coupon for FREE Book Do you want to make more money? Radio offers you many opportunities for well-paying spare time and full time jobs. And you don't have to give up your present job or leave home and spend a lot of money to become a Radio Expert. Many Radio Experts Make $30, $50, $75 a Week Radio broadcasting stations employ engineers, operators, station managers and pay up to $5,000 a year, Spare time Radio set servicing pays as much as $200 to $500 a year— full time jobs with Radio jobbers, manufacturers and dealers as much as $30, $50, $75 a week. Many Radio Ex- perts operate their own full time or part time Radio sales and service businesses, Radio manufacturers and jobbers employ testers, inspectors, foremen, engineers, servicemen, paying up to $6,000 a year. Radio operators on ships get good pay and see the world besides. Automobile, police, aviation, commercial Radio, and loud speaker systems are newer fields offering good opportunities now and for the future, Television promises to open many good jobs soon. Men I have trained are holding good jobs in these branches of Radio. Read their statements, Mail the coupon, There's a Real Future in Radio for Well-Trained Men Radio already gives jobs to more than 300,000 people, In 1935 over $300,000,000 worth of sets, tubes and parts were sold—an increase of 20% over 19341 Over 1,100,000 auto Radios were sold in 1935, 25% more than in 19341 22, 000,000 homes are today equipped with Radios, and every year millions of these sets go out of date and are replaced with newer models. Millions more need servicing, new tubes, repairs, etc. Broadcasting stations pay their em- ployees (exclusive of artists) more than $23,000,000 a year! ‘And Radio is a new industry, still growing fast! A few hundred $30, $50, $75-a-week jobs have grown to thousands in less than 20 years! Many Make $5, $10, $15 a Week Extra in Spare Time While Learning Practically every neighborhood needs a good spare_time serviceman, The day you enroll I start sending you Extra Money Job Sheets. They show you how to do Radio repair jobs that you can cash in on quickly! Throughout your training I send you plans that made good spare time money —$200 to $500 a year—for hundreds of fellows, My train- ing is famous as “the Course that pays for itself.” 6 Accept No Substitutes! Always Insist on the Advertised Brand! Set Servicing Spare time set servicing pays many $5, $10, $15 a week extra while learning. Full time servicing pays as much as $30, $50, $75 a week, Broadcasting Stations Employ mana- à i gers, engineers, T s operators, instal- I Give You Practical Experience lation and main- tenance ten for My Course is not all book training, I send you special fascinating jobs Radio equipment and show you how to conduct experiments and pay up to and build circuits which illustrate important principles used $5,000 a year. in modern Radio receivers, broadcast stations and loud i speaker installations. I show you how to build testing ap- paratus for use in spare time work from this equipment. This 50-50 method of training makes learning at home interesting, fascinating, practical. You Get a Money-Back Agreement I am so sure that I can train you successfully that I agree in writing to refund every penny you pay me if you are not satisfied with my Lessons and Instruction Service when. you i ENIM - Loud Speaker Systems Building, installing. i servicing and operating finish, I'll send you a copy of this agreement with my ae eg tar Free Book, for men well trained in Radio, Find Out What Radio Offers You Act Today. Mail-the coupon now for “Rich Rewards in Radio." It’s free to any fellow over 16 years old. It de- scribes Radio’s spare time and full time opportunities and those coming in Television; tells about my training in Radio and Television; shows you actual letters from men I have trained, telling what they are doing and earning. Find out what Radio offers YOU! MAIL THE COUPON in an envelope, or paste on a postcard—NOW! J. E. SMITH, Pres., National Radio Institute, Dept. 7AH Washington, D. C. = \\ ü mA A $ Mr. J. E. SMITH, President, Dept. 7AH Te a ie National Radio Institute, Washington, D. C. V an Dear Mr. Smith: 2900421) Automobile Radio Another new Radio field — selling, — installing, servicing. One milion or more auto owners will install radio seta with- in the next year. Without obligating me, send “Rich Rewards in Radio,” which points out the spare time and full time opportunities in Radio and explains your 50-50 method of training men at home in spare (Please Write Plainly.) time to become Radio Experts, NAME ... ADDRESS CITY. When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions

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Since the ‘‘Horseless Buggy” Days, We Have Helped Inventors ERHAPS you have already heard about our firm, because one client tells another—and we have served men in every state in the Union, and in nearly every foreign country. We have been working with inventors since 1898, If you have a good inven- tion—or an idea for one—and don't know what Victor J. Evans & Co. can do for you, NOW is the time to find out. How We Can Help You Both the Patent Office and the U. S. Supreme Court have made it clear that the inventor needs tbe assistance of a competent patent lawyer when it comes to protecting an invention. It is one thing to think up a good invention—it is another to get effective patent protection on it. For more than a third of a century —it has been our business to give sound advice and counsel to in- ventors. Our free books (described on the opposite page) tell what steps to take first, how to protect your- self, how the laws protect you, what you must do, when to offer your in- vention for sale, how others have succeeded, and much more. You need this information. 8 Accept No Substitutes! Simple Inventions May Have Excellent Com- mercial Possibilities FREQUENTLY inventors confuse the size or the complication of a device with the question of commer- cial value and patentability. These two factors, of course, have no re- lation to each other. Most of our present-day complicated machines represent a process of evolution, a series of inventions. On the other hand, every so often some inventor comes along with a very simple "gadget" which possesses the ele- ments of broad utility and is patent- able. Some of the most profitable in- ventions have been of this latter class. Shown above are a few such examples. Whether a device is simple or complex, if it represents a forward step to save manufacturing costs, to save labor, or to add enjoyment to human life, it may prove patentable and profitable. This subject is more fully discussed in the booklet en- titled “Patent Protection” shown on the opposite page. Davin SARNOFF, once a poor lad and now the famous President cf the Radio Corporation of America, in an article in Liberty Magazine states: "Civilization means elimination of un- necessary labor, The sewing machine and the vacuum cleaner save millions of women from backbreaking toil. The tractor makes the farmer's life bear- able. "The automobile lends wings to us all The airplane is our magic carpet. It would be madness to slow up invention because our trouble is not that mechanical science moves too speedily, but that the governmental and Social sciences move too slowly In a world reorganized to vibrate within certain wave bands, human intelli- gence will be able to distribute equitably nature's bounties from above and below, and make princes of paupers.” What Will Be Next? EVER since George Washington signed the first patent, America has led the world in inventions, It may be said that not a year has gone by without some important inventions being patented and commercialized. David Sarnoff, president of the Radio Corporation of America, sees a big future ahead for science and inven- tion. Just as sure as the sunrise, 1937 wil] see new inventions come out— new wealth made from patents, Your idea may be one of them. You never can tell, For this reason you should send for our books today and get the facts about patents and inventions. Always Insist on the Advertised Brand! These FREE books tell you Get the answers to your questions: How can I protect my invention? When can I show my invention to manufacturers? When can I offer it for sale? How should I go about selling it? Can I get protection with- out a patent? What are my em ployer's rights? These and other im- portant questions are fully answercd. Learn how our patent laws protect you The U. SE has liberal pat- ent laws, and much of our national wealth is based on pat- ents. In fact, a Japanese com- mission decided that American progress was mainly due to our patent laws. These laws are made to protect you. Find out about them now. "This is for your own good. Mai! Coupon Today Delays are dangerous. If you have a good invention you should get protection for it just as soon as possible. Don't turn this page unti] you have clipped and mailed this coupon—you will hear from us by return mail. vans & Co NEYS ATTOR ATENT ERED P Th REGIST qon BUILDING. naanod " LA, VIC .1445-B, Monda MAIN, OF SGN, bee th Bldg, New york be, Hobart BE 7 D- voolwor! ittsburah: " WASHINGT org, woo eiae, Pitter. sang UNE Micago: 511-B. Pes Bldgs Veo ent rotectionppliet! OF an7 gan Fral Same e me FRE ‘Invention. Shown E ses I sted above.) ji branch e! Request the book "Patent Protection" (sent free i a to inventors). Not only does it tell you what to do bos for protection, and how to do it—it also shows you 1 Name e street and NO e . . offic M eed 115 Mechanical Principles i p C MM 115 different mechanical movements that you may use in developing your own inventions. Inventors tell us they have found these useful. city or Town When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 9

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THAT HAVE BUILT BIG do not have to be complicated to be profitable when Patented. The 5c and 10c stores flourish on simple Patented products which are commercially successful. The zipper, safety pin, thumb tack, paper clip, collar button—all simple, yet familiar inventions—brought their in- ventors rich rewards. If you have a Patentable useful, widely popular, greatly profitable, and extremely successful inventions have been very simple ones. You have only to look at the devices we have pictured here to realize how a simple invention may become a utility bought by a hundred thousand or a million people soon after itis produced. Don’t be afraid that the sim- plicity of your invention makes it valueless. The thing that you find so simple that you wonder why a thousand other people haven’t already done If you have an invention that is patentable—and want to secure for yourself your inventor’s sole right to profit from the invention—you can’t afford to lose time in securing the protection of a U. S. Patent. Other inventors may be working on the same invention right now. Should they develop this invention and file patent application before you do—the burden of invention—act to protect it. Many of the most it is often the invention worthwhile. establishing priority will be upon you. Our Big Book—"Patent Guide for the Inventor”—will tell you the quickest possible way to secure Patent Protection for your invention, SEND FOR IT TODAY! HOW OTHER INVENTORS GOT STARTED The list of men who succeeded in in- vention with only a poor boy's start is a very long and noble one. Poverty, hardships, lack of friends, distance from the market—these could not hold back Bell, Edison, Eastman, McCor- mick, Whitney and others. Everyone cannot succeed. But every man can try. Courage, sacrifice, and hard work may bring you a measure of the suc- cess these men had. Lack of mechani- cal ability is not a serious draw-back. You can always get someone able to build a model, draw a detailed design, or otherwise materialize your inven- tion for you. The big draw-back is discouragement. Your invention of a practical article or an improvement upon an old one 317-S ADAMS BUILDING should be patented NOW. Frequently many of the thousands of applications filed in the U. S. Patent Office each year are for the same or almost the same invention. In such a case, the burden of proof rests with the last ap- plication filed, Sometimes a delay of even a few days in filing the applica- tion means the total loss of the patent. LOSE NO TIME. The entire time of this large and ex- perienced organization is devoted ex- clusively to patent and trade-mark cases. We know the rules and require- ments of the Patent Office. We under- stand the technicalities of Patent Law. We can proceed in the quickest and safest ways in preparing an application for a patent covering your invention. THE BIOGRAPHY OF GEORGE EASTMAN Views of the man who used Patent Protection to amass millions and give perfection to a new art—Photoyraphy—itself one of the greatest inventions. CLARENCE A.OBRIEN & HYMAN BERMAN WASHINGTON, D. C. Registered Patent Attorneys Before U. S. Patent Office 12 Accept No Substitutes! Always Insist on the Advertised Brand! The First Important Step in Securing a Patent is to obtain the services of a Regis- tered Patent Attorney. The U. S. Patent Office advises that you secure the aid of an experienced Registered Patent Attorney to prepare your statements. Establish the date of your invention as explained in our book and disclose your invention to him in correct form. He then makes a SEARCH of the Patent Office Records and reports to you on existing U. S. Patents which might bear on your invention, giving his opinion on the advisability of proceeding and filing formal application, Reasonable Fees—Con- venient Terms Don’t worry about finances. Our fees are very reasonable—we can arrange convenient terms of pay- ment. It is our custom to permit clients to pay for our services in in- stallments as the application pro- gresses in our office. See our Big Book for fees in obtaining Patent. It explains our arrangements clearly. Send for it NOW! FREE RECORD OF INVENTION FORM Use our Free “Record of In- vention" form to assist you in recording the descriptive out- line of your inventions and to establish the date of your in- vention. With it you can make a rough sketch of your invention and have it wit- nessed in a manner of value to you as evidence should occasion arise. CLARENCE A.O’BRIEN t£ HYMAN BERMAN. 317-S ADAMS BUILDING WASHINGTON, D.C. REGISTERED PATENT ATTORNEYS. BEFORE U.S. PATENT OFFICE Please send me at once your Big Free 48-Page Book, "Patent Guide for the Inventor” and your Specially Prepared “Record of Invention” form. Also George Eastman Biography, “Inventor and Business Man." This request does not obligate me. ADDRESS t i i | I l l l NAME .. l l l | When Answering Advertisements Please Mention January Modera Mechaniz Hobbies and Inventions 13

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717/267. Ctr Uocalioz eber Top—A, D. Pittenger, of Los Angeles, Calif., takes a friend for a sail in NOMAD, a boat built from MM plans. Tt carries four people. Bottom—Close-up showing construction. HE mailbag was pretty heavy this month and letters and photos describing many in- teresting projects completed by MM readers in- dicate that home workshops are gaining in popu- larity. From workshops with limited space and a few good tools to spacious shops equipped with lathes, many tools, and other mechanical aids, MM readers are turning out projects of every type and description. Most of them are built from plans that appeared in past issues of MM publications. eb Talking about making things, don't overlook the new 1937 edition of the MM Handy Man's 24 Home Manual that is now on sale at your local newsstand at 50 cents per copy. If your news- dealer has run out of copies, order one direct from MM at Greenwich, Conn. Presenting many practical kinks, plans, and detailed instructions for many projects, the manual will be à welcome addition to the library of any workshop fan. Its 144 pages feature over 800 illustra- tions. LIII First prize of $5 cash for the most interesting project photo received this month goes to A. D. Pittenger, of Los Angeles, Calif. He says: Los Angeles, Calif. Dear Editor: Enclosed are photos of NOMAD which I built in my attic. You can see from the photos that I followed the MM plans very closely, even to the hollow mast and boom, although I changed the cockpit a bit. She sails nicely and I have had her in a blow so hard that sand was flying on the beach. I have sailed for hours with four aboard and have hit some big waves without shipping any water. A. D. Pittenger. Pittenger's boat certainly is a beauty and judg- ing from the close-up of the craft, it entails craftsmanship of which he may well be proud. Good luck, Pittenger. EI Trailers are becoming more numerous and MM readers are quick to show their skill at con- structing them as the following letter proves: A real home on wheels is this trailer built by Howard R. Goldy, of Camden, N. J. Its four bunks, stove, radio, sink, and other household articles insure comfortable traveling. Modern Mechanix Hobbies & Camden, N. J. Dear Editor: I am sending you a photo of my trailer. It is 12 feet long and has a chassis similar to the one used by Sir Guy Standing in the MM "How To Build It’ book. Inside the trailer are four bunks, stove, refrigera- tor, closet, sink, and a home-built five tube radio. 1 have the MM article describing the CRUISEMITE trailer and would like to make my next trailer like it. Howard R. Goldy. Mr. Goldy was awarded a prize of $3 for his trailer photo and letter. He certainly has turned out a creditable trailer and we know he will encounter no trouble in building CRUISEMITE. ek Midget cars are still a heavy favorite with MM craftsmen and hardly a mail fails to bring several photos of trim little speedsters. A $3 prize was sent to Homer Groce, of Clemson, S. C., who says: Clemson, S. C. Dear Editor: I am enclosing a phota of a car I built. It has a model A Ford motor hooked up to a model T Ford rear- end. Cooling is accomplished by two radiators, cut down, and placed one in front of the other. I get 28 miles per gallon with the car and it is capable of doing 80 m.p.h. I will gladly answer any questions from MM readers if they include a stamped, return envelope with their inquiries, Homer Groce. Here's a chance to get first hand information about a real snappy looking racer. You can reach Mr. Groce at Clemson College, Clem- son, 8. C. EEES Boats and more boats. All good ones, too. No jac Featuring a double radiator cooling system, this midget racer attains a speed of 80 m.p.h. and travels 28 miles on a gallon of gasoline. It was built by Homer Groce, of Clemson, S, C. Inventions, January, 1937 A pleasant sight to the eyes of boat lovers is this trim looking sailboat built from MM plans. BUDDY, as the boat is known, was built in little over a year by Neil Hoyt, of Detroit, Mich. matter how many workshop letters the editor receives, the number of boat letters and photos far outnumbers the others. Our only regret is that we cannot print more of the letters, but space is limited. From Detroit, Mich., comes a letter and photo that secured a $3 prize for its writer. Detroit, Mich. Dear Editor: Here is a picture of BUDDY, built from plans in the MM book—"How To Build 20 Boats." I am very proud of her as she is the first boat I ever built. It cost about $250 and required a year and three months to build. I am putting outside ballast on the keel this winter as I use her on the Great Lakes. I'll be glad to give any information to MM readers who may wish to build BUDDY. Neil Hoyt. We sure envy Mr. Hoyt. He'll be able to make some excellent cruises in BUDDY. He has reason to be proud of her for she is a trim craft and pleasing to the eye. xu Winter weather always spurs the snow-sled fans and they don't forget to send photos to their [Continued on page 26] 25

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This attractive $3,500 model residence is being con- structed by Modern Mechanix in Leonia, N. J., five minutes’ drive from the George Washington Bridge over Hudson River. It will demonstrate the ease with which the average man can finance and build his home. ONVINCED of the ease of building their own homes, Tom and Jim and their wives purchased their building lots. Now spread before them were the blueprints—the plans of dreams which a short while before seemed impossible. Yet they were fast coming true. Jim had a small grocery store, $3,000 in savings and two children for whom he was doing his best in a crowded city flat. Tom, on the other hand, was a clerk earning $1,200 a year. After many years of strict economy he and Mary had managed to save $1,600. Jim liked to find his recreation puttering about in a home workshop; Tom was an amateur photographer, with a passion for doing his own dark-room work. Their city flats did not afford room for their hobbies. They were discussing these one day when Bill Johnson, who worked in an architect's office, showed them how his Boss could help them build their own homes which could be paid for at a cost cheaper than rent. Tom’s home—a one-story, four-room house to be built at a cost of $3,500 in Leonia, N. J., a few minutes from the George Washington: Bridge that connects New York and New ,Jersey—has been selected as a model home by this magazine, and construction is under way. Tom learned that with $1,230 in cash—in- cluding $600 for his lot—he could secure a loan of the additional $2,870 necessary from 36 Architect helps builder obtain best for money. Specifications for the home call for a brick wood- burning fireplace in addition to a steam heating system designed to maintain an even tempera. ture of seventy degrees even in sub-zero weather. an independent building and loan association or one connected with the Federal Home Loan Bank or the Federal Housing Admin- istration. The loan, payable at $29 a month, must be paid back in ten years. Jim, because of his two children, required a bigger house. His two-story, five-room home will cost $5,500. Of this amount he has $1,890 cash, and must seek a loan of $4,410, which he must pay back at the rate of $45 a month for the next ten years. Since the day they decided they could afford to build their homes things had been moving rapidly. Everything was ready now to submit to the contractors. The blueprints of plans and elevations of both houses, with specifications fully ex- plaining just what must be built into the homes and how to do it, included all the sug- gestions that Tom, Jim and their wives had made. Modern Mechanix Hobbies & on MM HOM by Wesley Sherwood Bessell New York Architect All the ideas that they desired in a home were carefully worked out. The plans were drawn up to a scale of one-quarter inch to the foot, and were similar to the original smaller sketches but with such changes as they had carefully discussed. It was agreed that requests for estimates be made at once. “But what if the figures run more than our allowances?” asked Tom. “In that case,” Bill answered, “we usually call in the two lowest bidders and suggest that certain modifications be made in the plans and specifications whereby the cost can be brought within the allowed amount. Or, if necessary, we make up an entirely new set of plans and specifications cutting the room sizes and thereby reducing the cubage, to- gether with other changes, and send these plans out for new estimates.” He went on to explain that the architect usually assumes the responsibility for the second set of plans, and that there is no charge for the additional work. He added that an architect endeavors to obtain as much for his client as he can, including the best and latest improvements. If all these come within the allowance, so much the better, but if figures are higher, he pointed out, he knows of savings he can suggest to the builder. “Well,” said Tom, enthusiastically, “every- thing seems to be in fine shape. To whom do Wesley Sherwood Bessell, the author, is well known for the homes, schools and postoffices designed by him in recent years in Long Island and New Jersey. PORCH FOUNDATION az STEP. FOUNDATION SHINGLE ROOF stucco STEP FOUNDATION ^ ENTRANCE SI ELEVATION. Inventions, January, 1937 CELLAR FOOTINGS EXCAVATE 2’ 6" BELOW FINISHED GRADE = ROUGH CEMENT Ate, FOOTINGS =~ CELLAR PLAN — These drawings show base- ment and foundation plans for the home. Concrete blocks will be used. for the foundation walls. Base- ment walls will be made watertight by. cement mor- tar inside and outside. 37

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Lasta by Aubrey D McFadyen his theory of relativity that when he patents a novel 3 refrigerating system it is not even regarded as news. When one reads that Thomas A. Edison patented 1,101 inventions, that John F. O'Connor, Chicago rail- way engineer has patented 968, or that Carleton Ellis, Montclair, N. J.,-chemist, has patented nearly 700 in- ventions ,the conclusion is immediately drawn that pro- fessional inventors are the backbone of the Patent ENATOR WILLIAM G. McADOO'S fingers were burned at a pienic when he picked up a metal thermos bottle cap-cup full of hot coffee. ` So he went home and invented a heat-proof cap. The Senator's latest patent covers improvements in the familiar safety razor—the new razor being constructed so that the blade can be Office. Nothing is farther from the truth. Men like inserted or removed without taking the razor apart. John F. O'Connor, Elihu Thomson, Carleton Ellis, To such casual inventors the world is indebted for Henry A. Wise Wood, Clyde C. ERI qoin Hays most of the 2,059,187 inventions patented in the United States-during the 100 years existence of the American patent, system; the centennial of which was observed in Washington on November 28. Hammond, Jr., and Ethan I. Dodds—all living inventors, each having patented over 300 inventions—are the ex- ceptions. For every professional inventor there are $ ^ ^ hundreds of amateur or casual inventors. In fact, Everybody; from: Presidents to prisoners, has been in- by reason of the inexperience of the casual in- venting all4manriers of things. It excites little wonder ventors, and their tendency to dabble in ‘whem an eniirént pianist patents numerous automobile fields in which they have little or no 5 Structure, or when a pugilist patents a monkey wrench, or even when a scion of one of the nation's experience, frequently their ideas have been the more radical and revolu- George Washington, pictured wealthiest families patents a shoe 4i p as painted by Gilbert Stuart, iting: desse. "Ihe name of tionary. Edmund qu found time in his versatile . 4, BO'SüIng, device. career to invent a seeding | Dr. Albert Einstein is so much in plow, a wine coaster and other P. ` 2 à 4 x farm devices. Samuel Clemens, the daily print in connection with famed as Mark Twain, pic. tured at right. invented the | un self-pasting scrapbook which By can still be purchased at sta- tionery stores. The illustration is from his patent. He also invented an adjustable strap for the backs of waistcoats and: trousers. Abraham Lincoln, famed for far differ- ent things, in 1849 invented and pat- ented a system of buoyant chambers designed to help boats clear shoals in the Ohio and Mis- sissippi Rivers. He was inspired by the difficulties of navi- gators which he wit- messed in the course ofa flatboat trip to New Orleans. A model is preserved Am the Patent Office.

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ARDUND the WORLD by H. R. Ekins First Man to Circle Globe Via Air Lines T TOOK a flight around the world, entirely by air, to bring home to me the tremen- dous strides made by commercial aviation in the last ten years. For me the journey of little more than 18% days, during which I flew a route of approximately 26,000 miles, was a study in aviation as it is today com- pared to what it was only a few years ago. On my journey I used eight aircraft in all. The first was the German dirigible Hinden- burg, the latest development in the science of lighter-than-air craft. The designers, builders and operators of the Hindenburg expect, however, that soon it will be sur- passed by new giant ships of the air. 50 The other seven aircraft were of the heavier-than-air type. Three were used in the United States. They were twin-motored Boeings of the United Airlines and Douglas DC-2's of TWA— Transcontinental and West- ern Airways. The three planes which took me all the way from Frankfort, Germany, to Manila were made by Douglas, and the long trans-Pacific hop was aboard Pan-American Airways’ “Hawaii Clipper,” the big four- motored flying boat built by Martin and powered by Pratt and Whitney. The aireraft listed above are the most modern and most efficient available to the civilian traveler. The study in contrasts. in- Above— The TWA Douglas transport plane that carried Ekins part way on his round- the-globe dash. Right—Ekins being congratulated by Miss F. W. Wilkins, TWA plane hostess, upon completing his race at Newark, N. J. Below —Dutch (K-L-M) Airline Douglas transports carried Ekins from Frankfort, Ger- many, to Batavia, Java. sofar as airplanes were concerned, began at Frankfort when I boarded a big Douglas air- plane operated by KLM—Royal Dutch Air- lines. Six years ago, when I was flying around the Far East as a war correspondent for the United Press, the most powerful of the air- cooled radial engines of the Wright Cyclone type, were rated at about 525 horsepower. In 1930 it was believed, on the basis of ex- perience and research with the material then available, that it would be decidedly imprac- tical to build an engine rated at more than 600 horsepower and stil| maintain even a vestige of dependability. Dependability in those days meant an engine that would operate for 250 hours between routine over- hauls. By 1931 the power of the Wright Cyclone was increased to 575 horsepower by using slightly larger cylinders to obtain in- creased cubic inch displacement. During the same year advances in metallurgy and knowledge led engineers to believe that they had underestimated the possibilities of engines of the radial type. To jump a bit to the advances which had been made by the time I was ready to take off from Frankfort for the Orient I should like to point out the following: All the way from Frankfort, Germany, to Batavia, Java, flying in only two planes, I flew behind 890 horsepower F-50 Cyclone engines. The plane of the Royal Netherlands-Indies Airways, which took me from Batavia, Java, to Manila, was powered with 715- horsepower Cyclones. When TWA flew me across the continent on the last leg of the journey they used a Douglas plane,

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The route followed by Ekins on His record making flight, using only commercial airlines, is graphically shown above. The safety and comfort of American air- planes was Ekins’ outstanding impression of the flight. the Sky Chief. It was powered’ with F-50 Cyclones of an 890-horsepower rating. The series F engines go back to 1932 when the Wright Aeronautica! Corporation an- nounced the development of engines rated at 100 horsepower at sea level. They weighed only two-tenths of a pound per horsepower more than the one pound per horsepower weight which the late Thomas A. Edison said was ideal for an aircraft engine. The suc- cess of the Cyclone F was immediate. 52 x ip, Hindenburg, over N. Y. City. Ekins started his now famous trip from Lakehurst, N. J., aboard the giant dirigible on Sept. 30. Little more than 18/2 days later, he circled Lakehurst in a TWA transport plane en route to Newark, N. J., having girdled the globe. Its first commercial application was in the fleet of Douglas Airliners with which TWA equipped itself in 1934. The American and Eastern Airlines followed suit. Strangely enough, most of this I learned while flying with Dutch pilots across Europe, the Near East, and India to the Far East. While flying over scorched, monotonous deserts I learned that in 1934 the leaders of Dutch commercial aviation were following developments in America closely. KLM negotiated with TWA to purchase one of its ships. TWA had the Douglas production tied up with priority rights. The Dutch got their ship. Cyclone pow- ered, it was used by two KLM pilots, Par- mentier and Moll, in the MeRobertson Lon- don-to-Australia air derby that involved 12,000 miles of flying. They took second place in the speed race and first place in the handicap division. By the time the race was over KLM had ordered a fleet of Douglas planes, all powered with Wright Cyclones. The performances of Cyclones in Douglas airplanes used to establish records both in this country and abroad caused the Douglas Company to standardize on the Wright Cy- clone engine for airliner installation. Of Modern Mechanix Hobbies & more than 150 Douglas airliners now in use only one, I believe, is powered with other than the standard engine. It was the dependability of airplane en- gines that impressed me most as I flew around the world. I was actually in the air 8 days, 10 hours and 26 minutes, and to a man anxious to get home swiftly, yet safely, the matter of dependability was of utmost im- portance. The motors behind which I flew in my early days as a passenger in airplanes would run dependably for only about 250 hours before overhaul. Now they will run at least 400 hours. Dutch engineers, great enthusiasts for American airplane power plants, told me that operation of 700 hours without overhaul is possible. Several developments, I found as I flew, are responsible for the high efficiency of the mechanical facilities which enabled me to get around the world as fast as I did. They in- cluded the dynamic damper, a patented de- velopment removing all vibration from the engine. There were also improvements in cylinder head designs and better cooling which marked an important step towards in- creased power. In this connection we can look forward to further advances in super- charging which will allow greater power, [Continued on page 150] Inventions, January, 1937 American airplanes equipped with Hamilton control- lable pitch propetiers like these above were instru- mental in enabling Ekins to set a world's air travel record. They permit short takeoffs, maximum speed. ad Ekins, 4.000 miles ahead of his racing rivals, shakes hands with the Dutch (K-L-M) Airline pilot who flew him from Athens, Greece, to Batavia, Java. Dutch airlines favor American airplanes and engines. | | et Above—Completing a flight of almost 26,000 miles in 1814 days, Ekins steps from a TWA Douglas transport at Nesaki N. E with a world's record for fast travel, using American aircraft most of the way. 53

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Within the thickness of the pencil in the calipers, 20,000 thin razor edges can be stacked. Each edge is one-eighty-thousandth of an inch. AKE a look at any group photograph of half a cen- tury ago. No matter what their station in life, the faces of the men you see there will be adorned with luxuriant crops of whiskers. Some were clipped plain, with the simple dignity of a cemetery hedge. Others were brushed and trimmed in weird and wonderful designs, like decorations on a wedding cake. Now take a look along the street—any street in almost any country. You see a new race of men entirely. You can really see their faces, and they are bright and clean. No more of this hiding behind the bush. Their jaws are as bare of foliage as an oak tree in January. Has science given us a new race of whis- kerless males? You know it has not. The whisker crop is as bountiful as ever, but it is harvested earlier harvested every morning by the majority of men throughout the world. Now the only conclusion we can draw from this is that men never really liked whiskers any more than did the women. But down through the centuries, elimination of the beard remained an ordeal, Then along came King C. Gillette in 1895 with the safety razor. Whiskers didn't dis- appear over night. Men were proud of the 58 BEHIND THE by Robert W. Gordon The oscillograph, an instru- ment that “sees” through steel. is used to detect hidden flaws. A sample goes into an electric furnace to be burned im a stream of oxygen. Vapors are analyzed to see that the proper proportion of carbon is present. Modern Mechanix Hobbies & RAZOR BLADE wiry toughness of their beards. You couldn't convince them that a little piece of metal stuck into a miniature double-edged hoe, could make shaving a painless, two-minute chore. Even those few with faces too handsome to conceal, who went through the daily face- scraping with much the same martyr-to- looks spirit a woman assumes when getting a permanent, demanded a great steel forging, laboriously hollow ground, and equipped with a fancy handle. It required a lot of stropping and honing to keep a keen edge on that forg- ing they called a razor. Á Gillette had the revolu- | tionary idea that it was only i the edge you shaved with, and that the rest didn’t really matter. He popularized shav- ing by developing an edge so sharp it is in- visible, yet so cheap you ean throw it away after using it once. And the edge of the razor blade actually is Variations in hardness are detected by this black box in the Gillette factory at Boston. If the steel io process above does not match the master strip below in hardness, the electricity going to furnace is varied. Inventions, January, 1937 2 This machine performs 2 one grinding, three hon- y ing and one stropping y operation and cuts and stacks the blades on racks. E l Samples of each coil are ~ | submitted to the dia- 2s mond test for hardness. If it fails in the require- ments, coil is rejected. invisible, even when looked at through the highest-powered mi- croscope. The cutting edges of 80.000 blades, laid side by side, would occupy only one inch of space. They demonstrate this absolute invisibility at the factory in Boston. They will show you a stack of blades a foot high, clamped to- gether on a special holder. So accurately are the blades cut that the unsharpened ends ap- pear as one solid bar of shining steel. Now turn the stack on edge. You see no shining metal there—only solid black. There is not enough metal on the cutting edges of that stack of blades to reflect a single beam of light. You can photograph it and get nothing on the plate but a solid black rectangle. Place a single blade on its side under a high-power microscope, and there will be no saw-tooth effect—only a straight line. Place the blade 59

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Blades are pictured at left during the sharpening process. Two sets of grinding wheels, one for each edge, first remove the rough stock. The girl at the right is operating the photoelectric sharpness testing machine. on edge and you will see nothing. One- eighty-thousandth of an inch is too infinitesi- mal a point in space to be seen by the eye, even when aided by the highest-powered microscope science has produced, To obtain a cutting edge so sharp, close control and microscopically-fine limits of ac- curacy are required for every operation of manufacture. Swedish steel is used because of the high quality of Swedish raw materials and the long experience and great skill in rolling pos- sessed by the Scandinavian mills. To insure uninterrupted production schedules with ac- companying uniformity of quality, a tremen- dous steel inventory, representing an invest- ment of several hundred thousand dollars, is carried in storage. The coils of raw steel arrive from Sweden, each wrapped in heavy crepe. paper, covered with oily waterproof paper, while the surfaces of the steel ribbons are coated with a special rust-proofing compound. Six coils are hermetically sealed in a tin con- tainer, which is protected by a wooden box. Thus protected, the shipping case could be immersed in sea water without damage to the contents. As the cases are opened at the factory, a 60 sample is cut from each end and tagged with the number of the coil. Another tag is placed on the coil itself, and follows the steel throughout the factory until the finished blades are packed. Each person who handles that particular coil, whether for manufacture or testing, must initial the tag. When the coil passes from one stage of manufacture to an- other, it is checked in and out of the control room. This intricate system of checking and rechecking makes it possible to detect flaws instantly and trace them to their source. It makes it possible to guarantee that only per- fect blades will be offered for sale. The original samples of the soft cold-rolled steel are submitted to a series of rigid labora- tory tests to see that specifications for width, thickness, and metallurgical characteristics are fulfilled, and only when these tests are completed, and an O. K. placed on the tag, is the coil released for production. | Width and thickness are checked by mi- crometer gauges, and the variations per- mitted are infinitesimally small, A sample is then placed in the oscillograph, an instru- ment that virtually sees through steel. Hidden flaws, strains resulting from improper rolling, incorrect micro-structure, are in- stantly detected. Modern Mechanix Hobbies & As a final step in the long process, finished blades are sprayed with a powerful antiseptic solution. They are then wrapped and sealed. Samples of each coil are then sent to the laboratory and mi- crophotographed at 3,000 diam- eters, A trained metallurgist studies these photographs to de- termine if the inner structure, the combination of elements making up the metal, is suitable for blades. Another sample goes into an electric fur- nace, to be burned in a stream of oxygen. Vapors resulting from this combustion are analyzed chemically to see that exactly the right proportion of carbon is present. This chemical content is extremely im- portant. Without the proper amount of car- bon the steel will lack hardness. With too much sulphur or phosphorus, the steel will not yield a eutting edge that will stand up for a number of shaves. With too little manga- nese or chromium, the steel will lack tough- ness. Metal failing to meet these rigid laboratory tests is immediately crated and re- turned to Sweden. If approved in the laboratory, the coil of soft steel is wound on a reel and sent to the perforating machine. But before it reaches the dies it feeds through two series of oil Inventions, January, 1937 wipers, which remove any foreign matter adhering to the strip and add an oil which aids the perforating die and prevents rust be- tween this and the next operation. These dies that punch out the center slot are the acme of accuracy. They must be if the blade is to be held in the razor at the cor- rect position for a proper shave. Unable to obtain such accuracy elsewhere, the factory employs its own corps of die cutters, any one of whom could grind the print off this page without removing a particle of the paper. So critical is the workmanship demanded here that in certain cases it has been neces- sary to release a man z from his bench to : other easier tasks for several months to prevent a nervous ? [Continued on page 118] Sideburns and full beards were the order of the day, even for young men, before dawn of the safety razor. 61

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AMERICAS NEWEST SEDENS AERIAL VIEW OF RACEWAY

BLOWER. FOR. PARKING * RADIATOR. e A CAR GOING 100 MILES AN HOUR. WITHOUT MOVING FORWARD! < à CHASSIS DYNAMOMETER TESTING RACING CAR'S HORSEPOWER, IGNITION, ETC. THE “LINDBERGH CORNER" -MOST DANGEROUS CURVE EMERGENCY OFFSHOOT FROM

SiZE OF GNE OF THE LARGE AMPLIFIERS FDR THE PUBLIC— ADDRESS SYSTEM Aw, S ON ALL C O ouc MORE TH 777 up

4 |TALIAN ALFA-ROMEO CARS WERE ENTERED, EACH CAR USED ABOUT 89.9 GALIONS OF GAS- OOSEVELT RACEWAY, located OLINE AND 2 GALLONS OF OIL í Aw ja : = at Westbury, L. L, is America’s 1 i newest and most dangerous auto- mobile race track. So dangerous is the four-mile. track with its twists and turns that Tazio Nuvolari, of Italy, who won the Vanderbilt Cup and $24,000 of the $60,000 prize money at the opening race last Columbus Day, averaged only 65.998 m.p.h. in his Alfa-Romeo MO DARE TBESAND SG CASES racer although he attained speeds of OF SPARE PARTS WERE BROUGHT 145-150 m.p.h. on the straightaways. OVER. The average 75-mile race staged at

64 Modern Mechanix Hobbies & AUTO RACE TRACK ` No ne RADIO ANNOUNCER'S CHIEF OBSERVERS US BOOTH £219. TOWER-IAS FEETHIGH — PUBLIC ADDRESS FROM WHICH ALLPARTS _ SYSTEM BOOTH

“ADMINIS pxrion | PA BUILDING AN By CONNECTION =, BY WIRE BETWEEN PHOTO-ELECTRIC CELL AND TIMERS ^ SPINNING WHILE. CUTTING SPEED WITH. POSSIBLE COLLISIONS, MADE THE TURNS DANGEROUS.

SORT EARTH TO. RETARD CARS: IF THEY HURDLI GUARD RAIL » the track requires over 1,200 twists and turns, compelling even the most daring drivers to slow up. The track features many safeguards to prevent the racing cars from crashing into the stands or spectators as they skid around the numerous turns. Steel guard rails, supported by stout posts buried three feet in the ground, provide the first check. Be- yond the rails is soft dirt, and then, a heavy wire fence that will stop the plunge of any car that hurtles the [Continued on page 125] Inventions, January, 1937 65

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a Copies of the “rough sketches” go to the car- toonists and musicians who build up the action and sound effects to the point illustrated. Above the results are being synchro- nized, and at right are some sound effect implements. 68 The movies have long possibilities of Dumas’ recognize the humorous possibilities of the Three which outline the action. J Sound Tricks of by Earl Theisen Illustrated by Walt Disney Squeaks, squawks, oinks and music—it's another animated car- toon hit, set to music in a brand new way. Read how the hay baler joins a symphony. USIC and noises in the animated cartoon interpret the action of the story. The narrative theme of the music and what is called the “sound effects” punctuates and emphasizes the story. By playing. on the aural nerves with symbolic. sounds and noises the psychological reaction of the audience is controlled and varied according to the dramatic and emo- tional needs of the cartoon story. If Donald Duck falls, for example, it is not enough for the sound man to hit a drum for the noise, but an additional sound character- istic must be added to convey a certain kind of fall. There are dozens of differ- ent “sound effects” for cartoon character falls which vary according to the story. When a sympathetic attitude is desired, the “fall” sound is hollow and devoid of jarring char- acteristics, while a harsh sound which shocks the aural nerves is created for that effect. The associative value of sounds is widely used for humor, such as a tearing noise which Part of the musician’s score for a "steam roller sym- phony." Without music, the action would lack life. 3 rA m eet) as d go o 3S al 2 “porte y ee BETON Kan SAROS * ato" fess 7 cat ee Socks MICKEY = VES: : i: . WEE ENDS VÀ Mugs fW a E Walt Disney tempts a INTO HAYSALER - É EN = penguin into conversa- MA NERY, Ca A tion with a strip of fish. (SEE MUSIC SHEET) eai Once the penguin be- ` NacHINg ENEN S gins to talk, his voice is swere Ue — ESS EROS ic recorded for movie car- BALE OF HAY z A BIET toon use. This bird zi - => Mici The "rough sketch" is heard in the film, ATA SPA EHE at left was given to Peculiar Penguins. All WAY OUT OF none MACHINE WIETS > "Pinto" Colvig for sorts of tricks are CIUS Expiosion) the musical interpre- needed to persuade var. Bilinear ys tation. Each moving ious animals to “talk. FLIES OUT part was turned into Gew'S HARP) sound as shown on accompanies the falling of a character. For humorous responses the “sound effect” is often caricatured and distorted. An example of this was the tire skidding noise used in “The Tortoise and the Hare” when the fast moving rabbit slid to a stop. Through study and experimentation Walt Disney and his engineers have found that by introducing music or various sounds and noise frequencies into the cartoon, the re- sponse of the audience is varied and con- trolled. By combining noises of certain pitches or tempos the psychological values of the cartoon music is emphasized in keeping with the story requirements. Sound of sixteen cycles is deep toned and may be used for conveying heavy or depress- ing moods, whereas the sound of a higher frequency is what William Garity, Chief En- Inventions, January, 1937 finished score above. gineer at Walt Disney’s, calls the “pain sen- sitive region.” Noises of this higher pitch make the hearer alert and may be carried to the point of actually causing distress, such as a “file on glass” noise. The average ear is very sensitive to sounds. of 2,000 or 3,000 cycles and unless some sound of this pitch is added to the cartoon background noise, the audience is less responsive to the effects. Stories are told by sound. “Pinto” Colvig, who wrote the lyrics for “The Three Little Pigs” and who does many of the sound “imi- tations” for automobiles, airplanes, or ma- chines when they assume human character- istics, is able to convey a whole story by sound. For example, in a recent picture he caricatured a steam roller at work by suitable noises, pops, puffs, razzes, and wheezes. Vocally, without the aid of mechanical de- 69

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Such A last minute conference before re- cording. Disney and his director talk it over with the conductor. In the Monitor room the director, head engineer and Disney listen to the sounds produced on the sound stage. Here sound is reproduced exactly as it will be heard in the theater. vices, he depicted a narrative episode of a very busy steam roller that worked hard, then got tired and stopped. To do this he made a picture on paper of the sound by working out the suitable suggestive sounds and inflections which he set down on music paper according to the desired effects, tonal range, and tempo which brought to life the pen and ink steam shovel. “Pinto” Colvig with the aid of a trombone and vocal sounds can make an airplane do all sorts of antics. Real airplane sounds cannot be con- trolled to musical tempo for cartoon effects. Each sound in a cartoon film is the result cf much thought. Such things as bugs, all 70 clever bits of action as this would fail flat without a humorous musical accompaniment. The Silly Symphony orchestra on the special resonator floor which is used for special effects. Fifty or sixty hours of rehearsal are required in the production of the average film. sizes, getting the hiccoughs which happened in “Mickey’s Garden" when Mickey sprayed them with “bug eliminator” required hours of rehearsal before the sound was recorded. For some sounds hours are required in re- hearsal, and fifty or sixty hours are required to make the sound for the average cartoon. There are six men and women under con- tract at Disney's who do nothing but mimic and imitate many sounds. The distorted Donald Duck conversation and singing is done entirely by mouth without mechanical aid, as is that of Madame Clara Cluck, Mickey, and the other characters. Walt, him- self, does the Mickey chatter. Much of the "imitator's" time is spent in inventing car- toon noises. For cartoon kisses, the "imitator" kisses his own hand or arm. For a Mickey-Minnie embrace, the "imitator" kisses the heel of his hand, while a tiny bug osculation is obtained from his thumb. A moist noisy smack is gained by kissing his arm at the elbow bend. Cartoon embraces are not as emotional as they are humorous because of the caricatured sound. Modern Mechanix Hobbies & Each gag used in a Silly Symphony is selected from hundreds of others. The gag department contains thousands of inventions which will never be pat- ented, for they operate only upon film for the amuse- ment of theater patrons. Here are some ideas sub- mitted for The Country Cousin but not used. They will be filed according to description on the card. Here is a Silly Symphony in full swing, from the quartet at left and sound effects men at center to the orchestra at right. The panel at left “mixes” and blends the various sounds. Recently a sound of a cartoon character talking under water was needed. After much experimentation, the sound was made by one of the “imitators” who talked while a com- mon garden hose ran a stream of water into his mouth. While much of the sound is made vocally, mechanical devices and various materials are also used. One kind of slow-burning fire noise is made by crinkling cellophane, while a more crackling fire sound is gained by twisting a bundle of bamboo strips. A train getting under way is obtained by a tin can in which is a handful of gravel. By shaking the can and gravel up and down, the noise of a real railroad train is created. Another “train noise maker” consists of a number of wires held at one end by hand. The other end of the wires is rubbed over a sheet of corrugated tin. Thunder claps of various kinds are obtained by cowhides and sheets of metal, while wind noises are made by rapidly revolving a wheel with wire spokes. Another hollow ghostly wind noise is made by re- volving a wooden drum against taut silk. Rain noises are made in a drum in which are Inventions, January, 1937 Now that music is carrying a big part of the action, the car- toon animator times his action to so many drawings per beat of music. The number varies according to the musical time. stretched piano wires. Particles of glass dropping against the wire when the drum is revolved creates the sound. Lion roars are obtained from a barrel over which is stretched, drumlike, a piece of skin. Into the center of this skin is tied a heavy piece of cat-gut and the sound is made by sliding a rosin coated piece of leather down the cat-gut. Dog barks are made by similar though smaller contraptions. Various dog bark pitches are made by using assorted sizes of tin cans. The dog “language” is produced by the manner in which the rosined leather is slid on the string. Often ordinary tools such as egg beaters which furnish machinery noise, derby hats which supply thumping or more exactly a “plop in” sound, and so forth are used for suitable noises. 71

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The skill and grace of star ice skating performers is graphi- cally shown inu this series of action D Iotograph hs taken by George Ryan, Minneapolis (Minn.) Tribune cameraman. The photos, taken by a super-speed camera, show Norris Modern Mechanix Hobbies & and Naome Wold going through the evolutions of the “puck spin" at Lake Of The Isles in Minneapolis. Fancy skating calls for a degree of skill and precision second to that of few other activities. Speed, balance, strength, endurance— Inventions, January, 1937 all are required of those who would. perform on the flashing blades. A slip here, a moment’s hesitation there, and what started as a graceful exhibition is turned into an awkward, stumbling display. Constant, painstaking practice is necessary. 75

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smens Spor x : Äi ene Sai TACKLE For Salt NLESS you are familiar with sea fishing the selection of the proper tackle is open to conjecture. There are so many sea fish, all of which fall into many and various divisions such as large, medium and small, some mad tearing and others just a little bit better than very active. All of these species have to be taken into consideration when selecting sea- fishing tackle. : Needless to state the tackle to be used for sea fishing must be picked according to the size of the fish one is after. Obviously the very large fish, such as the marlin swordfish, the sailfish, the tarpon and the tuna (all racy fish of tackle-testing proportions and ac- tivity) demands the stoutest and most en- during tackle. For such fish a double enamel tip of 60 inches and a weight of approximately 14 to 16 ounces is a suggestion. The butt length will be 20 inches, or the rod, with butt in place, measuring 6 feet. 8 inches over all. With a rod of the sort a 9-0 reel or heavier is a suggestion. A 36 to 38-thread cutty- hunk line is often used although lighter lines are selected by those practiced in the use of medium weight tackle. Medium weight tackle is used in the taking Circe——Hooking a tarpon is synonymous to roping a wild mustang. When the strike occurs, the great fish leaps high out of the-sea in efforts to shake off the hook, then the fight is on. - Below—A sextette of big ones soon to become swordfish fillets In Southern California waters, where these pictures were taken, monster, man-eating sharks often bite chunks from the fish before it can be hauled aboard the boat. . Campfire _ SAM of such fish as the barracuda, the amber- jack, the great kingfish, California yellow- tail, crevalle and others. The rods for this purpose should range from 10 to 14 ounces, with a 6-0 reel to keep it company. A 24 to 30-thread cuttyhunk line is a practical sug- gestion. A double enamel rod is not needed for this department, the single enamel rod being suitable and not too light. A tip in this class weighing 9 ounces has a length of 60 inches. A lighter rod, one ranging 7 to 10 ounces in weight will take a 4-0 reel, with a cutty- hunk linen line of from 15 to 21 threads. A rod of the sort will handle with ease all fish less in weight than the species listed in the second class. Incidentally, let it be men- tioned that in this third class of sea fish, in which will be found the mangrove snappers, the Spanish mackerel, the bluefish, the sea trout, the channel bass, the smaller croakers, the robalo, the sheepshead, and others, the common, everyday bait rod and black bass fishing tackle such as is used in inland fishing is now much in vogue. In fact, there is an ever-increasing disposition on the part of anglers to invade even the ranks of the class PS Water FISHING ~ by Robert Page Lincoln Whe-e-e-e-e-e! sings the reel in the song of the strike. Out behind the boat is a war- rior in a writh- ing, silvery dance—a cyclone on a leash! d Sometimes a young hammerhead shark gobbles up the bait, as shown above. To cut the hook from the mouth of this detestable fish often results in a skinned arm or hand, for sharks have sandpaper skin. Below-—A proud man poses with .a 200-pound marlin- swordfish ich he caught in the Gulf of Mexico.

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GLACIER PRIEST Maps RET ep: Look right and down into the age- old ice and know why Father Hub- bard is called the “Glacier Priest." He took this picture from his per- ilous perch across the great crevice. by James N. Miller LYING into the craters of volcanoes, skimming dangerously over the ice caps of the North, and exploring the mummy of a ghost world in the “Valley of Ten Thousand Smokes,” have provided thrills galore for Father Bernard R. Hubbard, S. J., inter- nationally known as the “Glacier Priest.” Now, after his tenth trip to the roof of the world last summer, when he brought back a remarkable balance sheet of hard luck and achievement, the famed explorer plans to turn from the study of geology—the science of rocks—to the study of primitive human beings. For, while pondering the mysteries of the birth of storms that influence the four seasons of the year in the United States for better or for worse, Father Hubbard believes he has also fathomed the origin of man in America, who came to this continent on a newly dis- covered ancient road from Asia. Father Hubbard believes that his last trip, the tenth in a successive series, was the most important of all He found that the Taku ice-cap, near Juneau, one of the southern- most formations of its kind, is receding and exposing a fossil glacier of the last Ice Age. Nearby, he said, the Taku glacier was half aground and will soon cease breaking off ice- bergs, and Twin glacier has receded a mile and is wholly aground. This means the tre- mendous flow of icebergs that consitutes an ever-present menace to shipping hundreds of miles to the south, soon will be a hazard of the past. 82 NE. Does this rock writing mark the road by which ancient man first came into America from Asia? Father Hubbard (above) believes so, claiming many came in over this chain of Aleutian Islands, although the main route was by the Bering Sea. Viewing the immense Taku ice-cap last summer for the first time in ten years, the Glacier Priest reported: “The vast ice mass is shrinking, which proves that the earth is still in a recessional ice age. On Taku ice-cap many new moun- tains, called Nuntakas, as well as long, rocky ridges have appeared where I saw only Modern Mechanix Hobbies & Soaring over craters, jumping bottomless pits _ edged with rotten ice, 7 frozen by gales, feet fry- ` ing in volcanic heat— ^ these are experiences of Father B. Hubbard. Magook, Father Hubbard and Wolfe— the three pals who fought the dangers of six Alaskan expeditions together. And last summer, when a mother huskie gave birth to seven woolly pups, Magook and Wolfe toted the babies in addition to their 50 Ib. packs. Off Bogsolof, Father Hubbard attempted to make a 4-ton sea lion into a movie actor, but was rebuked with angry barks and a lumbering chase that threatened to crush the nearby cametas and scientific apparatus. A full-grown sea lion is no man’s friend. ———À Li dal crevassed ice ten years ago, Taku glacier and the lobes of Twin glacier have retreated. The Mendenhall glacier has been melting back and is exposing a fossil glacier under- neath the present one. The hundreds of square miles of this ice-cap and its many glacier tongues are a new layer of ice hun- dreds of feet thick lying on top of a remnant of the last ice age, which is a fossil body of ice entirely different in crystal form. It ap- pears here and there as the upper layer melts." Father Hubbard and his party found land- locked icebergs in Twin glacier lake, the bottom of which is 600 feet below sea level. The icebergs float there the year round, and Inventions, January, 1937 keep the water near freezing temperatures. Nicholas Cavalierre, of New Haven, Conn., a member of the Hubbard party, took 50,000 feet of motion pictures of the Taku region. The year before, on the ninth expedition, the party also took 30,000 feet of film of action "shots" of glaciers of a spectacular type never before filmed—showing enormous mountains of ice tearing away from the glacier mother to strike the sea below with a terrific roar and splash. These "shots" were made on the final 60-mile lap of exploration of the entire 600 miles of the Alaskan Peninsula and adjacent islands, and were taken from a small steamer anchored alongside Hubbard glacier in Dis- enchantment bay, southeastern Alaska. [Continued on page 128] 83

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BETHLEHEM ÜpensNew — $20,000,000 MILL From the roughing rolls shown at left, that receive the thick, ho: slab of steel, the metal moves in a continuous ribbon, emerging as finished strip from rollers, above. Rolled strip sheet emerging from a tandem of cold milis which give it high finished surface. Below—Strips coming out of the pickling bath before entering the cold mill process. Jets of water, at 1,000 pounds pressure, play on hot steel as it enters the rolls to knock off the oxides, or “mill scale." by Watson Davis AN and machine reach new heights of co-ordination in a new $20,000,000 steel strip mill of the Beth- lehem Steel Co., at Lackawanna, N. Y., near Buffalo. Human brains and skill, both in design and operation, combine with precise and delicate control of large electrical power to roll a thick slab into a lengthy strip of sheet metal in a few minutes. To see a red-hot chunk of steel pass successively through eleven huge sets [Continued on page 128] The finished product ready for cold-forming into auto bodies and hundred-and-one other products. It is shipped in flat sheets, as at left, and in coils weighing tons each. White hot slab emerging from furnace to start the leng roll into a thin strip. 86 Modern Mechanix Hobbies & Inventions, January, 1937 3j ^ 87

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TINY AMPLIFIER FEATURES This compact metal tube amplifier provides both B power and speaker volume for small sets. VERY radio experimenter has occasion at some time to use an amplifier; es- pecially if he owns a small two or three-tube any amplifier that had the least bit of output was a bulky affair weighing at least 25 pounds. With the improvements in radio design which have been made during the last few years it is now possible to construct a powerful little amplifier in a tiny metal chassis .scarcely measuring 7 by:4Y5 by 2 inches. Small as it may be it is nevertheless capable of deliver- ing nearly 3 watts of undistorted power am- plification. Provided with a tone control for use with shortwave receivers this compact all-pur- pose amplifier has an output of three watts. NOTE: MAKE TUBE SOCKET CONNECTIONS ONLY TO PRONGS INDICATED ——LEAVE OTHERS BLANK if he follows this wiring diagram carefully, All parts are shown in their relative positions in set. 90 Modern Mechanix Hobbies & Short wave receiver. Until a few years ago. METAL TUBES by Wm. J. Vette Suitable for all experi- mental needs this compact metal amplifier has an out- put of approximately three watts of undistorted power. 500,000 OHMS DIAGRAM SHOWS BOTTOM VIEW OF SOCKETS SPEAKER SOCKET ^ SWITCH ON TONE CONTROL eie MO V. A. C. A POWER || TRANSFORMER If this schematic wiring diagram is followed along with the pictorial hook-up there is little chance for errors to occur. Note that the tube prongs are not all connected in the circuit since some are blank. Tube sockets, above, show the connections as they appear from the bottom of socket; pictorial diagram shows top view. The construction is begun by forming the ` chassis from a sheet of alloy metal or aluminum. Of course, sheet iron may be used but it is more diffieult to "handle. After punching out the holes for the tube sockets, assemble the sockets and proceed to wire up the various parts. Work can be simplified if the pictorial and schematie diagrams are carefully studied before any actual construc- tion is started. i Examination of the circuit will reveal the use of three metal type tubes. A type 6F5 tube is used in the input, a type 6F6 in the output and a type 5Z4 rectifier tube in the power supply circuit. By wiring up these Inventions, January, 1937 tubes according to the numbers appearing on the prongs in both the pictorial and schematic diagrams no difficulties will be encountered. In order to operate the amplifier at its peak efficiency a novel code tone control is em- ployed. One potentiometer serves as code tone control while the other is used to regu- late volume. The volume control is fitted with an A. C. switch so that one control turns on the power and regulates the volume of the receiver as well. : A unique feature of this amplifier is the self-contained B and filament power supply for supplying current to a small short wave [Continued on page 132] 91

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EXTEND HOLIDAY GREETINGS

HEAVY WALL = BOARD 4 THICK TURNS ON ALL LIGHTS

OPENING IS COVERED WITH SSS THEATRICAL SCRIM AND BACKED H) i] I) j WITH CARDBOARD. LETTERS ARE 4 CUT IN CARDBOARD yet

PLASTER OF PARIS MOLDED OVER NAILS <, BAKELITE

„TABS

1 ty V4 THICK bee This sparkling greeting n4 | archway blinks like, a on theater sign. e roller contact switch shown me here operates lights. TABS ON DRUM Plaster and water glass LIGHT EACH LAMP are used for snow. SEPARATELY CLEATS TURN ON ALL LIGHTS AT ONCE

FLASHER UNIT

The flash is shown at left. Roller revolving over con- ts tacts causes lights to blink. by David A. Brown “a Yq QUARTER-ROUND TN THE creation of novel Christmas deco- rations for the home, amateur craftsmen will encounter many interesting tests of skill and ingenuity. Carpentry, electricity and metal working all play a part in the adapting of the traditional symbols of the season to modern ideas of design and utility, and ihe workshop enthusiast who directs his atten- tions toward such a seasonable project is certain to enjoy many hours of entertaining work; his home will reflect the spirit of the occasion; and he will have the satisfaction of knowing that he has done much to preserve the beautiful customs long associated with this ancient holiday. By combining light and shadow with mo- tion, an unusual house top decoration may be contrived from the time honored Santa and reindeers. Cover the accompanying illustra- tion with a sheet of tracing paper ruled into 14” squares and, with the intersecting lines : S tree as guides, transfer the figures to a 4’x6’ piece rd ei cdca esce of wall board which has been marked off into 94- Modern Mechanix Hobbies &

t MODERNISTIC | ERT TREE

SLEIGH The frame of this novel BELLS Christmas tree is of wood, WITH OUTDOOR DECORATIONS

REINDEER PIVOTED ON

THROUGH K 69 RE WIRE TWISTED : OVER BOLT SANTA AND SLEIGH REMAIN STATIONARY VOLTS < A = 1 \ so watt D 2 SURPLUS WIRE CAN que LAMPS SE | BE BENT TO FORM i ‘ J STAR AND CIRCLE tea] STRAP IRON I BRACKETS PL S f CRIMP EDGE TOJ " TAKE WIRE FASTEN TO

Eas, REENFORCE- ROOF WITH Ve 3 Wooo screws stor e a 18; LONG fg WIDE

CUTOUTS MADE FROM WALLBOARD Jur] TORUM

QUARES-LZ7 THE

CONE TOPPED 20 GALLON SOLDER

FORCE SPOUT DOWN OVER CORK —~ » 2

4 This animated decoration of Santa and his reindeer ia easy to make if above details are followed.

A 20-gallon oil drum provided this novel Christmas tree. Cut the can as shown, insert several sets of tree lights and then solder together and mount the tree on a suitable wooden base. 134” squares. On similar material, lay out the semi-circular background, Cut out all pieces, and paint the silhouettes black and the back- ground blue. Coat this last with shellac and sprinkle with mica sign painter’s brilliants while still wet. Tack the house tops to the front edge and the background to the rear edge of a light trough constructed of 1”x6” material. Wire this trough to take four 50- watt blue colored light bulbs and cut the opening through which the slotted lever passes. Swing this lever on the shank of a long wood screw or heavy nail driven through it from the rear edge of the trough. Screw two wooden candy pail lids together so that their beveled edges form a belt groove and mount it on a %4”x3” bolt lock-nutted to This beautiful Christmas the single wood support which projects down CURRENT. TRansmirrep | Wreath is not only illuminated, from the bottom of the light trough. A lock- TWO SPRING CONTACTS | the center greeting. Below it is nutted bolt set on the outer circumference show the mow speed reduces, [Continued on page 132] p ' BRASS A / STRIPS | f i

SIGN DOES NOT TURN = HOLLY LEAVES TIED TO BURLAP AND CEMENTED TO REVOLVING FORM SPEED REDUCTION UNIT

Inventions, January, 1937 95

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TINY HAND POWER GRINDERS This model ship is just one of the many interesting projects that can be fashioned to exacting specifications by using a hand grinder for carving. Though it has ali the marking of the professional modelmaker the miniature craft shown above was made by an amateur model fan. Some details and sanding were done by grinder. by A. T. Dalton O THE man who has a small workshop and limited room at his disposal yet who has a reasonable knowledge of wood-working and desire for carving there should be a very definite appeal in the new light weight por- table high speed electric tools which allow a limitless variation of carving on wood, stone, cast resins and other material of this char- acter, These high speed, light weight, electrically driven tools are conveniently shaped to fit the hand and owing to their perfect balance can be used over long periods of time without danger of fatigue. The secret of their great usefulness for carving lies in their high speed. A large variety of especially developed steel cutters are used with the unit and leave smooth uniform cut and does not have to be finished by sanding or other means. This 98 Interesting caricatures such as this one are easily carved from solid or laminated blocks of wood. The hand power grinder is provided with a chuck for taking numerous cutting, drilling and sanding tools. This attractive ship lamp nearing the final stages of completion was carved from a block of walnut. The tiny decorative de- signs are being applied to the sail with a finishing bur tool. class of tool is, primarily, a finishing tool and thus lends itself to finishing work that has been roughed out. Another method most frequently used is to cut plywood to the appropriate figure desired and glue the plywood together to form a lami- nated block. For the craftsman who has not had previous experience in woodcarving it is suggested that the rough figure to be carved be cut from a solid block of wood by means of a hand saw. Modern Mechanix Hobbies & SIMPLIFY MODEL CARVING Carving wood caricatures is not difficult provided the figure is sketched in front and profile views on the block of wood. Comic strip characters also are ex- cellent subjects for carving and are easily made. The figure shown in the accompany- ing illustrations makes an interesting project relatively simple for the ama- teur craftsman who wishes to try his skill with these new type of hand tools. There are no excessive details such as hands or background with this figure. 'The squared diagram shows the front and side views. Transfer these pro- files to their respective positions on the wood-block which has been built up from plywood or, if you prefer, solid block of wood. The design ean then be cut out with band saw, jig saw or with a hand saw. Using a rather large steel cutter rough out the design to the approximate figure follow- ing the outline given. Many craftsmen indi- cate the form that the model is to take by shading the design that has been drawn and transferred to the block. This often times serves as an excellent guide for bringing out different characteristics of the carving after it is actually underway. It is difficult, and perhaps futile, to explain the step by step procedure to follow the modeling of the face for an example. With a design as simple as our first figure it is ap- parent that the cheeks, jaws and any portion of the fact are first cut with a relatively large steel cutter. Mustache, eyes, eye-brows and nose are formed with smaller steel cutters of the ball shape and flame shape, a large variety [Continued on page 124] Inventions, January, 1937 sr À plaque like the one shown here of Will Rogers can be carved by first tracing picture on a flat wood block. T Carved caricatures can be finished in a very attractive manner by painting them with colored india inks, water colors or lacquers. A few camel's hair brushes will sim- plify this work especially in the painting of facial fea- tures. Right—-Any of these tools may be used for the various purposes to which the grinder may be put. Below— Sanding a model boat hull is simple when grinder is used. BRUSHES d es n- m SANDING DRUMS || AND DISCS 99

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COMPLETING the Authentic in every detail this minia- ture of the famous Mayflower can be built by anyone handy with tools. This final install- ment covers paint- ing and rigging. by Erling W. Eklof PART III AVING completed all hull and cabin details on the model Mayflower as de- scribed in the November and December, 1936, issues of Mopern Mecnanrx HOBBIES AND Inventions final work on the painting and sail rigging of the ship may be started. In these, the final stages of your model extreme care should be exercised in painting and assem- bling the sails and their rigging so as to fol- low out the authentic details as much as possible. For painting the model, you will need at least one small sharply pointed brush to get into the small places and one flat 44-inch chisel shaped brush. You will also need one ean of light oak stain and one can dark mahogany. To get the desired shades mix these two stains in varying proportions. Blue, white and black enamel and varnish will be needed as will tubes of oil paint in yellow ochre, Indian red, raw sienna and dark green. Now you can start the decks. You want a light natural woody color. Get this by using just a touch of dark mahogany in light oak stain. Don't let it get too dark. You want 102 some contrast between the decks and deck fittings which will run to a little darker than medium brown. Make the inside of the bul- warks a little darker than the decks, and the timberheads a shade darker with railings and steps quite dark. You will find by rub- bing a little Indian red on the steps, ladders and rails that they will get a slightly worn appearance as if human feet and elbows had rubbed off some of the finish. The outside of the bulwark and wales is a rich brown chestnut color. The channel be- tween the lower wales is black with Indian red brushed in and under the beak and trail boards some musty dark green. Below the wales, stain the hull dark brown. Rub some yellow ochre along under the water line where the hull has its greatest beam. Rub or brush in dark green under the counter and under her belly coming up in close to the stem. Blend in these colors as if worn in by the ravages of time. On the trail boards and rails at the beak the conventional design of the time in black and white and blue and white should be carefully painted on. The same applies to the stern castle sides. I chose blue because it is a symbol of water and the sea; also designating faith and hope which is particularly appropriate to the pilgrim ship. Over the design, rub in a few light rusty stains; just enough to make it appear old. Paint a fine thin red line on the upper edge. Make the masts and yards a medium reddish brown, the panels in the doors black. The indentations on the fluted capstan and the top of the capstan are black. The cleats are light and worn. Paint the long boat the same as the hull of the ship. The thwarts and sail locker are a natural wood color. Stain the oars and mast. The wales of the long boat should be light. In regard to the design on the stern of the Mayflower, you need not adhere to my origi- nation providing you have an appropriate design of your own. May I describe the sym- bolic significance of the design. The flower at the top of the design is a semi-heraldic rose, the rose being, as you perhaps know, Modern Mechanix Hobbies & MODEL Inventions, January, 1937 This is the Mayflower com- pleted, truly a magnificent piece of craftsmanship. In order to retain the beauty for years to come the ship should be finished in stains that will not fade or lose their tone. Artists’ oil paints of good quality will insure a lasting finish for parts that are in color.

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The topmost illustrations show the Lanyard threading and dead-eye mounting arrangements. Sail rigging is simplified by lower diagrams showing how linen threads fasten to tackle. 106 same way. Drill one hole in place of three. By flattening the sides of the dowel, blocks may be made in the same fashion. Drill one hole near one end of the block. In the event that you have no lathe to use, you can reverse the process, drilling the holes in the end of the dowel, then grooving and cutting off with a hand scroll saw. Very fine blocks and dead- eyes can also be purchased from ship model supply houses. It is essential that deadeyes and blocks should not be used too large or the appearance of the whole model will be spoiled. Concerning the sizes of cord for rigging, the heavy rigging used for shrouds will be No. 5 mercerized crocheting cotton. For the medium, No. 10; for the light, No. 40, and for the fine used for lanyards and ratlines, No. 60 serves very well. This may be obtained at any dry goods store. Dye the heavy, medium brown, and the medium cord, just a tint lighter. The light and fine cord numbers 40 and 60 respectively should be dyed a tan color, a shade darker than ecru. To do this, draw the cord through dye or stain of the de- sired shade. If you wish, you may use linen fish line which, outside of being stronger, has no particular advantage. After having stepped the masts glue in the bowsprit and lash it down with the gammon- ing. Use the heavy cord for this. Throw a hitch around the bowsprit and slide it down to the cleat. The cord goes through the for- ward end of the slit in the cutwater from the port side to the starboard. Then up around the bowsprit from starboard to port for about eight turns. Wind the cord around each half of this lashing and secure it with a clove hitch so you will be able to wind about five turns around the whole of the lashing. Fasten the end with a good knot and the gammoning is completed. Next come the chain plates. They are the straps that go around the deadeyes and secure them in their position just above the chain wales. They are made of No. 22 brass or aluminum wire. Bend the wire around the deadeye and make a twist to secure it and then below where it fastens to the hull, make a small eye in the wire to take a pin. Where the chain plates are secured to the hull, there is an iron strap (make this with red fibre) that follows the sheer line. Be care- ful to keep the deadeyes even. After you have all the chain plates and their deadeyes in place, take a piece of heavy cord and seize it around a !4-in. deadeye. To aid in setting up the shrouds, make a U shaped Modern Mechanix Hobbies & sharp cornered form from No. 22 wire to hold the deadeyes about two of their lengths apart. Insert this wire form in the hole of a left hand deadeye on the chain wale and put the other end through the deadeye seized to the heavy cord. Now pass the cord up through the lub- bers hole, around the mast and down through the lubbers hole on the same side, and seize a deadeye to its lower end, even with the first. Draw a lanyard of fine cord through these two deadeyes in this manner. First tie a knot in one end of an 8-in. cord. Reeve this through the right hand lower hole of the upper dead- eye looking from the outside with the knot in back, then down to the upper right hand hole in the lower deadeye, then up to the middle hole of the upper deadeye, down on the outside to the corresponding hole in the lower deadeye, up again to the remaining hole in the upper deadeye, and down to the left hand hole in the lower deadeye and fasten with a clove hitch where the shroud is seized to the upper deadeye. Do not cut off the loose end as yet. Now take the wire form off of the first set of deadeyes and run the lanyards through them. Draw the deadeyes even and secure with clove hitches. Cut off the loose ends. Seize the two shrouds together directly under the cross trees. Do the same on the port side then back to the starboard and con- Fore sail rigging details are made clear in this rigging diagram. Before starting on the actual sail construction read carefully all text pertaining to this part of Mayflower model 30 as to avoid errors. Sails are cut from linen. U FORE SAIL BOWLINE 2E TOP SAIL BOWLINE 2M SPRIT SAIL HALYARDS 2N SPRIT SAIL. GARNETS 20 TOP MAST STAY LEAD 2P SPRIT SAIL LIFTS 2Q SPRIT SAIL BRACES 2R SPRIT SAIL CLEWLINE 2S SPRIT SAIL SHEET Inventions, January, 1937 tinue until all the lower main shrouds are on. Keep the mast in the central position, but leaning aft a little more than one part in thirty. When the main stays are put on, they will pull it forward to its correct position. The fore and mizzen shrouds are done in the same method, but because of the odd numbers of the shrouds, they go around the masts and to the opposite side instead of in pairs on the same side. Let’s get at the stays. Lay up three parts of heavy cord by fastening the three ends in something firm and twisting the other three ends with an ordinary hand drill. Two cords twisted similarly will serve as the mizzen stays. Saturate them with thin model aero- plane glue to keep them from unraveling. The main stay is double in the form of a strap. It goes up between the cross trees and around the mast; the other end goes through a hole in the stem. The whole stay is.pulled together with a lanyard using the j5-in. round deadeyes and passes on each side of the fore mast, the lanyard being situated immedi- ately behind this mast. The fore stay is fast- ened by a lanyard, its lower deadeye lashed [Continued on page 126] ^| CIRCULAR TOP || LEFT OFF 107

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The simple coaster pictured in the circle above is the ideal project for the beginner in metal spinning. Before any actual spinning is done a hardwood form or mold must first be made. Above is shown a completed mould in the lathe. by Dale R. Van OME soft metal lends itself so admirably to manipulation in a wood turning lathe, that projects involving its use are an inter- esting home shop diversion. With some patience one can turn out very presentable creamers, trays and boxes with lids from sheet brass, aluminum and copper. Sheet lead is so ductile, easily worked and bears such a close resemblance to pewter when finished, that this metal is ideal for the beginner in spinning metals. This article covers briefly a number of simple projects, each one easily made. It also touches the use of a metal lathe for harder metals. One of the easiest ways to spin soft metal dishes is as follows: Briefly, you need two pieces of wood and a sheet of metal Turn one hardwood block to the shape you desire for the inside of the dish: Turn another small block from 114 to 2 inches in diameter and about J5 inch thick with one side smooth, the other carrying the deep indentation of the 110 Horn After the metal sheet has been turned to fit the wooden form the Square corners are trimmed off with a regular lathe cutting tool. Right—In spinning this aluminum dish run the forming tool from the center of the work until the sheet metal fol- lows the shape of the hardwood form. dead center. The sheet of lead is centered between these two blocks, rubbed with candle and the metal gradually forced over the form. Should there be any tendency for the metal to work out of line, make a depression in the right end of the mold not more than the sheet metal thickness in depth and see that the tail stock wood block is a little smaller. Then turn the tail stock up tight. This forms a bulge in the metal sheet which locks it in position so long as the tail stock is turned up snug. After forming, the metal is polished, the waste trimmed off and the piece then dipped in laequer. Sheet pewter, aluminum, copper and brass can be turned into small, attractive dishes in the same manner. Modern Mechanix Hobbies & PROJECTS ON A LATHE LEAD INLAYS INGROOVES CUT WITH FILE TANG 3732" WIDE This cross section diagram gives all the dimensions needed in turning and spin- ning the inlay ash tray. TE After completing the lead ash tray lining polish it with steel wool until it is the color of pew- ter. Lock lining in wood bowl. Access to a metal turning lathe simplifies greatly, the work involved in forming shallow dishes from soft and semi-hard sheet metal. A little coaster of sheet aluminum of con- siderable thickness was formed in a jiffy in the metal lathe setup. The hardwood block turned to shape, acts as a mold for the coaster. Any round tool can be set in the tool post, then the metal forced to the shape of the mold : and later the waste cut off. After forming the piece should be rubbed with coarse steel wool. Rough aluminum or copper pin trays can be made without special rigging in the wood lathe by using a wood mold and letting the edges take whatever shape they wish. Inventions, January, 1937 This beautiful inlay turning can be duplicated in your shop after doing some experimenting with the more simple projects. The bowl is turned from walnut and the inlays filled with strips of lead. The bowl lining is spun from h” sheet lead. Let's next try a simple, all-metal ash tray which can be made in groups of four for home use or bridge parties. From a wholesale plumbing or hardware concern, get sheet lead having a 4;-inch thickness. Turn a soft wood block down in the lathe to 4 inches in diameter. Bend the lead corners over the side of this and tack in place. Start up the lathe and with the round end of a dowel, rub the lead flat against the wood. To reduce friction and heat and to prevent possible cutting of the lead by the dowel, rub the metal surface with a candle stub for lubrication. At high speed, rub this now smooth surface with fine steel wool to give it a good luster. Then wipe with a rag dipped in soda water or vinegar to cut off the grease. Cut another block of soft wood 3% inches square and rather thick, then with the drill press, bore a 44-inch hole from each of the four sides to the center of the block. Center this block in the lathe and turn away enough of the right side to expose half of the holes, turn the block round and sand smooth. The lead square is laid over this with the polished side next to the wood and the corners again tacked fast. Using the dowel again, and the candle stub, the unfinished side of the lead is smoothed and worked into the shape of the wood mold. When the depression has been made, remove the whole unit from the lathe and, laying a 111

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AMATEUR —— oTo PUZZLERS d In this department the Photography Editor will answer any question or problem related to cameras of all types, enlarging, printing, devel» oping, taking pictures, and the various phases of home movie making. When sending ques- tions to this department, be sure to include a stamped, addressed envelope in case space does not permit publication of the question and reply on this page. Send all inquiries to the Photog- raphy Editor, Modern Mechanix Hobbies & In- ventions Magazine, 22 West Putnam Avenue, Greenwich, Connecticut, MAKING A COPY OF SNAPSHOT PRINT T have a small snapshot picture which I treasure very highly. I would like to secure an enlargement of this picture, but since I no longer have the negative I have been in doubt about the possibility of this. Since I know very little about photo- graphy I am wondering if you can enlighten me on this matter. —Grace Cook, Dover, Delaware. Good enlargements up to 8 by 10 inches can be secured from small snapshot prints simply by photographing the snapshot on a fine grain film and enlarging this film to the particular size desired. Any photographer can do this work for you. "The cost is nominal. TRICK PHOTO RECEIVES $5 AWARD By exposing one half of the film at a time with a “duplicator” Harvey Herdman, Branchville, N. J., secured this unusual picture. The girls are not twins, but one and the same person. For his clever photography Mr, Herdman receives $5.00. ACTION PICTURES WITH BOX CAMERA Is it possible to take action pictures with a box camera? ‘Last month I attempted to take pictures of some of the ex- citing plays during our school’s football season, but the results were very disappointing. What kind of camera should be used for taking action pictures?—-David Rendown, Phila- delphia, Penna. Action pictures cannot be taken with a box camera since it is fitted with a lens that is entirely too slow for the pur- pose. Action pictures, if they are to be clear, must be taken with a camera having a [.2 or faster lens. The usual box camera lens is an £.8 which is, as you can well see, too slow for recerding action scenes. The photograph editor will pay $5.00 or $3.00 each for photographs interesting enough for publication on this page. All pictures should be mailed to Modern Mechanix Publish- ing Co., Greenwich, Conn. X $5750 KODAK DUO SIX-20 A true “miniature”; compact, finely built, yet it takes 16 alburn-size pictures (155 x 214 inches) on a rol) of Kodak Film (four types available). Negatives are sharp; give big, clear enlarge- ments. Shutter, 1/500 Compur-Rapid. Lens, Kodak Anastigmat f.3.5. Price, $57.50. KODAK RETINA $5750 Concentrated photographic versatility ...lens, anastigmat f.3.5; shutter, Compur-Rapid— 9 speeds up to 1/500 second. Loads with any of five different Kodak Film Magazines (in- cluding new Kodachrome for full-color trans- parencies). Negative size approximately 1 x 114 inches. Price, $57.50. KODAK BANTAM SPECIAL This exquisitely made *'miniature'' fits the hand. Lens, Kodak An- astigmat EKTAR f.2.0. Shutter, 1/500 Compur- Rapid. Military-type range finder, coupled with focusing mecha- nism. Makes needle- sharp negatives for superb enlarge- ments (low-cost size, 244 x 4 inches); or Kodachrome transparencies. Price, $110, $110 116 Accept No Substitutes! Always Insist on the Advertised Brandt FOR THOSE WHO LIKE THEM SMALL Miniature Kolaka X KODAK SIX-16 H (f.4.5) Smallest folding , camera taking 214 x 44-inch pictures. F.4.5 lens; 1/400 Com- pur-Rapid shutter. Price, $40. (With f.6.3 lens, $20; withDoublet lens, $16.) E : KODAK RECOMAR 18 Advanced ama- teurs delight in its f.4.5 lens, 1/280 Compur shutter, self timer, ground- glass focusing back. Loads with film packs, cut film, plates. 24 x 8M. Price, $54. KODAK DARKROOM OUTFIT NO. I Contains trays, chemicals, developing clips, safe- light, printing frame, thermometer, instruc- tion booklet—everything necessary for first- class work. Also includes the book, “How to Make Good Pictures." Price, complete, $8.75. : OR THOSE WHO LIKE THEM LARGER Precision Koala FOR THOSE WHO WANT MOTION i Cink Kod abs CINE-KODAK EIGHT Movies at ‘*10 cents a shot”? The “Eight” makes it possi- ble. A roll of Ciné-Kodak Eight Panchromatic Film costs only $2.25, finished, ready to show. Good for 20 to 30 black-and-white movie "'shots," each as long as the averape scene in the news- reels. Price, $34.50. $3450 CINÉ-KODAK “K” Most widely used 16 mm. home movie camera— it's so simple, yet so fine. Makes clear, brilliant movies at the touch of a button. And as the user's Skill increases, re- sponds to every exacting demand. Loads with full 100 feet of 16 mm. film. With f.1.9 lens, $112.50. $1250 MAGAZINE CINÉ-KODAK Loads in 3 seconds. Slip in the magazine, close cam- era cover, and shoot. And you can switch to another film in a jiffy, even when but part of the 16 mm. film has been exposed. Effortless loading is only one of six new features. With f.1.9 lens, $125... Eastrnan Kodak Company, Rochester, N. Y. ALL CINÉ-KODAKS MAKE FULL-COLOR MOVIES ON KODACHROME FILM When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 117

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Behind The Razor Blade [Continued from page 61] breakdown. The dies these men produce are accurate to one ten-thousandth of an inch. After perforating, the blade strip is gauged for centrality—a measurement from the center slot to either edge. This distance must be held con- stant. The importance of accuracy here can scarcely be over-emphasized, since centrality of the slot controls the proper positioning of the blade in the razor. Since the hardening process requires a surface absolutely clean, the coils of steel are “laundered” in the de-greasing machine immediately before entering the hardening furnace. The de-greaser passes the perforated coil through a soda wash, through high pressure jets of water just under the boiling point, through blasts of compressed air, a scrubbing box, a tank of special grease solvents, through jets of live steam, and finally compressed air again. The razor blade makers were the first to recog- nize the fact that steel received from the rolling mill cannot be uniform, even in a single coil, and that to produce a uniform finished product, the temperature of the hardening furnace must fluc- tuate to compensate for these variations. Since the furnaces maintain a temperature of approximately 1500 degrees Fahrenheit, and the difference between a good and a bad blade can be affected by a change of only 10 or 12 degrees, the control for the hardening furnace must be extremely sensitive and entirely automatic. A “magic black box,” situated midway of each furnace, furnishes this automatic control. A mas- ter strip of steel of exactly the correct temper is inserted in this box. If the steel in process does not match this master strip exactly in hardness, the magic box flashes an impulse to a control panel regulating a battery of automatic switches, and the amount of electricity flowing to the fur- nace is altered the required amount to bring the steel to the desired standard. It is in the hardening furnace that the distinc- tive blue effect of a blade is obtained. A patented apparatus feeds a special mixture of gases to the furnaces, and the blue becomes part of the steel itself. As the strip of steel leaves the hardening fur- nace it passes through the tempering plates that make the center section easy to flex when the blade is placed in the razor. A coat of rustproof- ing oil is then applied before the coil is rewound. Samples are broken off of each coil after it leaves the furnace, to be submitted to a hardness test under a diamond-pointed instrument. If a sample fails to meet the required standard the whole coil is rejected and the furnace is stopped until the trouble can be found and remedied. These samples are then sent to the cathode ray oscillograph—the electro-magnetic tester previ- 2d TAKE IT FROM Il we, LARRY-THESE YEAST CAKES ARE SLICK STUFF TO | FINISH OFF PIMPLES — JUST YOU 7 START EATING. EM RIGHT Guv! 118 Accept No Substitutes! GEE CHARLIE — YOU SURE ARE ONE SWELL (NOW LISTEN, LARRY —YOU CANT "BACK OUTS f ously described. Variations of hardness and tem- per, or any hidden flaws or strains, are revealed here by a green line of light flashing on the fluorescent face of the oscillograph cathode ray tube. So accurate is this device that the passing of a sample through the flame of a match will cause a variation of hardness great enough to bring about a rejection. Next is a bending test to make sure the center of the blade will flex in the razor. Having passed these tests, the coil of steel, now perforated, hardened and tempered, is run through a series of delicate gauges, to again de- termine that the breadth, thickness and centering are uniform. The approved steel is again passed through the "]aundry," after which it goes to the etching ma- chines, where the trade mark and other distinc- tive lettering are etched on the metal with acid. After another examination, the coil is sent to the sharpening machine. 'Two sets of grinding wheels, one for each edge, first remove the rough stock. Next the honing wheels, cutting at a different angle from the grinders, produce a per- fect bevel on each edge. After being honed, the blades are washed clean and dried with compressed air before passing on to the stroppers of specially tanned leather. Each blade is finished on 280 feet of sharpening surface while passing through this machine. Inspectors stationed at the ends of the finishing machines submit their blades to tests with micro- scopes and gauges, finishing the test by cutting hair with the blades. Samples from the finishers are also sent con- tinually to the laboratory for examination by a photo-electric sharpness comparator. This ma- chine measures the area of the blade edge with a beam of light. As the light traces down the length of the blade, a dot is thrown on a ground glass. With cross-section paper placed over the glass, a girl traces a graph of the blade's edge. If the graph is straight, or nearly so, the blade is satis- factory. If it is saw-toothed, irregular, some- thing is wrong with the grinding machine. That machine is stopped immediately, and the blades it has finished must be rejected. The finished blades now go to a room which at first glance you would take to be a library. Girls are studiously pouring over, not books, but stacks of blades. Every blade that leaves the factory is inspected by these girls. After passing this last barrier the blades are sprayed with a powerful antiseptic solution, after which they are immediately wrapped, sealed in a wax-paper envelope and an outside wrapper. In an endeavor to improve its product the Gillette Company has several inventors on salary, constantly working on new developments for the razor and blade. And all so you won't wear whiskers. SAY WHATS BITING you? YOU'RE NOT SERIOUS ABOUT. NOT BEING IN READ HOW LARRYS PIMPLY FACE ALMOST MADE HIM QUIT THE SHOW T CERTAINLY AM- D/vou FELLOWS TAKE | ME FOR? THINK I WANT | TO GET UP AND PLAY IM FRONT OF A BUNCH OF PEOPLE WITH THIS PIMPLY FACE? m NOT MUCH! REESE: WHAT, GOSH - WHY DION'T I THINK OF IT BEFORE ~IF THOSE PIMPLES ARE ALL THATS HOLDING OFF , LARRY -I KNOW WHAT WILL FIX'EM! 4E HEY CHARLIE -TAKE WA SQUINT AT MY FACE- THAT FLEISCHMANN/'S YEAST WORKED WELLI TOLD yo IT WOULD CHASE THOSE BLOSSOMS - DONT I? Always Insist on the Advertised Brand! Ugly pimples make any boy or girl want to steer clear of the spotlight. oung people suffer this em- arrassment after the start of adolescence—from about 13 to 25, or even longer. b tant glands develop and final growth takes place. Don’t let Adolescent Pimples keep YOU from being a hit throughout the system. The skin becomes very sensitive. Waste poisons in the blood irritate this sensitive skin. As a result, pimples appear. Fleischmanu's Y east clears these skin irritants out of the blood. Then, pimples go. Eat 3 cakes dail — one before Yet many During this period, impor- This each meal— plain, or in a Ut- Causes disturbances tle water—until skin clears. D ~ clears the skin by clearing skin Irritants out of the blood Copyright, 1836, Standurd Brande Incorporated When Answering Advertisements Please Mention January Modern Mechanix Hobbies and Inventions 119

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