Modern Mechanix, September 1936

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GERMAN PADDLE PLANE SEE PAGE 68 e raini ing T d eeds- Boat Spe o om 3 > o D Wo jar

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Safe at the Plate... Lights Fail. We HAVE A “twilight league” at our summer camp. One time, when I was on second base and a teammate made a hit, I dashed for home, thinking of nothing but how badly we needed another run. I crossed the plate breathless and ran smack into a bat a fellow was swinging carelessly. It laid open a deep wound along my eyebrow, so they took me to the doc- tor’s cabin. It was getting dusk and the camp electric plant was out of order, so the doctor told the boys to bring flashlights. We all had them, of course, but only one boy had one bright enough for the doctor to use. It was an Eveready Boy Scout. And the fellow who owned it said it was brighter because he had real, fresh Ever- eady Batteries in it and not just any old His Head Cut Open Harold Genesen Rushed | to Camp Hospital Where -e o o a casualty ten feet beyond kind. That accident showed me that just having a flashlight isn’t enough . . . you’ve got to have good fresh Eveready Batteries in it... if you are going to live up to the Scout motto: “Be Prepared.” EVEREADY BATTERIES | are FRESH BATTERIES NATIONAL CARBON Co., INC., 30 East 42nd Street, New York, New York a YOUR HUSBAND | CERTAINLY KNOWS HIS BATTERIES, MA-| $ DAME.THAT DATE | LINE PROTECTS THE BUYER AGAINST THE CHANCE OF GETTING A STALEN N BATTERY. AN

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ea Radio Expert Many make 990) #50 $75 a week | will train you at home for many Good Spare Time and Full Time Radio Jobs Do you want to make more money? Ra- dio offers you many opportunities, for well-paying spare time and full time jobs. And you don’t have to give up your pres- Extra Money Job Sheets, They show you how to do Radio repair jobs that you can cash in on quickly! Throughout your tain- ational Radio Institute ing I send you plans that made good The man who las directed the home study training of more men for the Radio Industry than any other man in America. Broadcasting Stations Employ managers, engineers, operators stallation an- maintenance men for nating jobs aud pay up to $5,000 Ine fasci- Set Servicing Spare time set serv- icing pays many $5, $10, $15 a week extra while learning. Full time servicing pays as much as $30, $50, $75 a week. Loud Speaker Systems Building, installing, servicing and operat- ing public address systems is another growing field for men welltrained in Radio, HERE’S PROOF THAT MY TRAINING PAYS $60 Monthly in Spare Time “*I work on Radio part time, still holding my regular job. Since enrolling five yeara have averaged around $80 evel month?’ JOHN B. MORISSETTE, 77 Silver Street, Manchester, N. H. Makes $50 to $60 a Week “I'am making between $50 and $60 a week ‘after all expenges are paid and Lam getting ail the Radio work [ can take care of, thanks to N. R. 1.” H.W, SPANGLER, 308 Walnut St., Knoxville, Tenn. Operates Public Address System **I have a position with the Los Angeles Civil Service, operating the Public Ad- dresa System In the City Hall Council. My ealary is $159 a month.” R.H.ROOD, R. 136, City Hall, Los Angeles, Calif. ent 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 engi- neers, 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 ag $30, $50, $75 a week. Many Radio Experts operate their own full time or part time adio sales and service businesses. Radio manufacturers and jobbers employ testers, inspectors, foremeu, engineers, service- men, 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 low speaker systems are newer fields offering good opportunities now and for the fu- ture. ‘Television promises to open many food jobs soon, Men I have trained are holding good jobs in these branches of Radio. Mail the coupon, There’s a Real Future in Radio for Well Trained Men Radio already gives jobs to more than 000 people. In 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, 5% more than in 1934! 22,000,000 homes are to- day 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, ete, 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 Weok Extra in Spare Time While Learning Practically every neighborhood needs a good spare time serviceman. The day you enroll I start sending you Read their statements. ADDRESS... spare time money—$200_to $500 a year—tor hundreds of fellows. My training is fa- mous as “the Course that pays for itself.’* I Give You Practical Experience My Course is not all book training, E send you spccial Radio equipment and show you how to couduct experimeuts and build circuits which illustrate impor- tant principles used in modern Radiu re- ceivers, broadcast stations and loud speaker installations. I show you how to build testing apparatus for use in spare tine work from this equipment. This 50-56 method of training makes learning at home interesting, fascinating, practical. ` YouGeta MoneyBackAgreemenrt I am so sure that I can train you success- fully thet I agree in writing to refund every penny you poy me if you are not satisfied with my Lessons and Instruction Service when you finish, TIL 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 describes Radio’s spare time and full time oppor- tunities and those coming in Television; tells about my training in Radio and Tele- vision; shows you actual letters from men I have trained, telling what they ore doing and earning. Find out what Radio offers YOU! MAIL THE COUPON in an envelope, or paste on a postcard—~NQW! J. E. SMITH, Pres., National Radio Institute Dept. -dtt Washington, D.C. This Coupon is Good for ... -One FREE Copy of My Book J. E. SMITH, President, Dept. 6-JH 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 et home in spare time to become Radio Experts. (Please Write Plainly.) NAMED wssseisoiacininescsoscssisncnsecancineetente sens oe Gk es cs nce ese em ae te eed Thank You for Mentioning Modern Mechanix Hebbics and Inventions When Writing to Advertisers 3

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PRICE | SEPTEMBER 15 CENTS 1936 SAME PRICE Volume XVI IN CANADA Number 5 CONTENTS SPECIAL FEATURES NEXT MONTH Training Army Air Fighters - - - - 36 By Brig. General H. H. Arnold, Assistant Chief, Army Air Corps Science Vies With Sport At Olympics - 42 Making Boats Go Faster- - =- + =- 46 By Gar Wood with Paul Weber Whirling Funnels Spread Disaster - - 52 By S. D. Flora, Topeka Meteorologist Stunting On A Motorcycle - - =- =- 56 By E. Leland Elam Eoo Daniel M. Daniel, New York World- 60 Telegram baseball writer, contributes an unusual article on unusual phases of the game for the October issue. In something of the manner of the late Ring Lardner, Mr. Daniel recalls the first player to wear Tackle Suggestions For Best Bass Fishing 64 a glove, the first catcher to wear a’ mask D and countless anecdotes of the national a game. If you enjoyed his “Scoring on By Robert Page Lincoln Stolen Signals” last month, you will like the October article. Don’t miss it! Auto Triumphs Feature Texas Centennial The Pre-Fabricated House Arrives - - 79 By Donald G. Cooley FOR WORKSHOP FANS The How-to-Build section of MM for October will include a bicycle radio set, directions for battery making, plans for a basement pump, an article on color photog- raphy for the amateur, design for a novel refreshment cabinet, lathe projects and scores of helpful home improvement kinks. e Plastics Revolutionize American Industry 30 By W. A. Swanberg [Continued on page 8] Published monthly by Modern Mechanix Publishing Co. at Broadway and ilth St., Louisville, Ky., U. S. A. Enlered 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. Editorial and general business offices, 22 West Putnam Ave., Greenwich, Conn. Address all manuscripts lo Modern Mechanix Hobbies & Inventions, at the Greenwich. Conn., address. Not responsible for unsolicited manuscripts, Contributions accompanied by insufficient postage w not be returned. In U. S. and Possessions and in Canada, 15¢ a copy; $1.50 a year. Other Postal Unions, $2.00 a year. Printed in U. Advertising forms close the first of second month preceding date of igsue. Advertising offices: New York, 1501 Broadway; Chicago, 300 8 a Michigan Ave.; San Francisco, Simpson-Reilly, 1014 Russ Bldg.; Los Angeles, Simpson-Reilly, 586 S. Hill St. Member Audit Tureau of Circulations. Managing Editor, William Kostka; Editor, Tom Mahoney; Associate Editors, George S. Scullin, Thomas A. Blanchard; Hunting and Fishing Editor, Robert Page Lincoln; Naval Architect, S. S. Rabb 4

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r ) IF RUSTY BRAINS did squeak, no one would have to warn you against trying to get ahead in a modern world with antiquated training! Keeping your brain modern is just as important as keeping plant equipment modern. The best way to keep your brain up to date is to keep your training up to date. The business of modernizing men's training is the business of the International Correspon- dence Schools. All over the world men testify to the effective- ness of I. C. S. training — and if you are stuck on a job, if your pay envelope is too thin, this coupon can be the first step towards changing the whole course of your life. * BOX 2317-J, SCRANTON, PENNA, Without cost or obligation, please send me a copy of your booklet, “Who Wins * and Why,” and full particulars about the subject before which I have marked X: O Architect O Architectural Draftsman O Building Estimating O Contractor and Builder D Structural Draftsman O Structural Engineer O Management of Inventions O Electrical Engineer O Electric Lighting DO Welding, Electric and Gas O Reading Shop Blueprints O Boilermaker O Business Management D Office Management O Industrial Management O Traffic Management O Accountancy O Cost Accountant Name. If you res Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers TECHNICAL AND INDUSTRIAL COURSES D Heat Treatment of Metals Sheet Metal Worker Telegraph Enginecr Telephone Work O Radio Mechanical Engineering Mechanical Draftsman O Machinist O Tooimaker DO Patternmaker D Diesel Engines D Aviation Engines O Automobile Mechanic O Refrigeration OC. P. Accountant O Bookkeeping Secretarial Work D Spanish O French D Salesmanship O Advertising O Plumbing O Heating O Air Conditioning O Steam Engineer O Steam Electric Engineer O Marine Engineer O R. R. Locomotives O R, R. Section Foreman O Air Brakes [O R. R. Signalmen O Highway Engineering D Civil Engineering O Surveying and Mapping O Steam Fitting O Ventilation BUSINESS TRAINING COURSES D Service Station Salesmanship O First Year College O Business Correspondence O Stenography and Typing D Civil Service O Aail Carrier O Railway Mail Clerk Address... -Present Position pondence Schools Canad O Bridge Engineer O Bridge and Building Foreman O Chemistry D Pharmacy O Coal Mining O Mine Foreman O Navigation O Cotton Manufacturing O Woolen Manufacturing O Agriculture O Fruit Growing O Poultry Farming O Grade School Subjects O High School Subjects O College Preparatory - O Mustrating O Cartooning O Lettering Show Cards [J Signs „ Limited, Montreal, Canada

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O BE successful as an in- ventor, you don’t need to be an Edison who took out 1099 Patents before he died, or a C. F. Kettering, who helped develop the Self-Starter, Duco, Ethyl Gas, and other outstanding inventions, and is today the famous head of the Research Division of the General Motors Corporation. In fact, you don’t need to be known as an in- ventor at all, if you. have a prac- tical. useful, salable invention—or an idea for one—and go about it right. Remember that for every Edison or Kettering, for every McCor- nick, DeForest or Atwater Kent— there have been thousands of un- known men whose inventions helped along the wheels of prog-' ress and helped the inventors fi- nancially at the same time. Many Little Ideas Have Big Commercial Possibilities For example, who knows the name of the iuventor of the wooden golf tee, the ordi- nary crinkly hair pin, or the metal ball or disc that the average housewife uses for scouring pots and pans? Who knows the inventors of the thousands of gadgets that you will find in the ten-cent stores, in the modern drug and department stores? Some day, stop and look at some of the simple articles you'll find on the counters of a ten- cent store. Notice how many of them are marked Patented or Patent Applied For. It is au interesting, educational experiment. These inventors, most of them, weren't of the genius class.. They simply got an idea for doing something in a better, easier, faster, or more economical way—-ANI) THEN DID SOMETHING ABOUT IT. We Cordially Invite You to.. 6 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Interesting Points wi Whe; E today’s Ans.: John F, O’Connor, of Chicago, Il, holds 949 Patents. more than any other living man. “champion in- Who is “Lady Edison’? Ans.: Miss Beulah Louise Henry of New York City leads all women inventors, holds fifty patents; is known as "Lady Edison”. What is an improvement? Ans.: Nearly all inventions today nre improvements over eurller in- ventions. Often the improvement proves more profltable than the earlier invention, Is a model necessary? Ans.: Today, most inventions are patented without models. A subject fully explained in our book. What is the preliminary search? Ans.: The preliminary search is ordinarily the first step to help an inventor, Also fully explained in our book, Send for a copy today. A New Book About Selling Inventions There are two sides to cvery inventive The inventive side and the com- invention success! mercial side, A good You may be able to do as well as others who have been successful. That only time can tell, But there is one thing you can do, and do now, without waiting on time. You can find out easily and quickly exactly what to do to protect yourself. In the 48-page book, “Patent Protection’’ shown on the opposite page, which will be sent to you FREE, we tell you what many other in- yentors have done, just what you yourself must do to make Application for a Patent, give you interesting facts about inventive history, show you 115 mechanical move- ments that inventors have used in working out ideas, and much more. Decide now to get a copy of this interesting book. Its facts can be worth much—yet they cost you nothing. poorly handled, can prove a failure commercially. An ordinary invention, properly handled, can be made a money-maker. In the special booklet, shown here, we give you some sug- gestions on “When and How to Sell an In- vention”; practical hints on the commercial side of inventing. We'll send this new booklet along with the big 48-page book, ‘Patent Protection” illustrated on the next page. Use the convenient coupon to request your copies,

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YOUR QUESTIONS ANSWERED! There are a " lot of ques- tions that the average man with an invention, or an idea for one, wants answered before he goes ahead. Here are a few of them that most inventors put up to us: How do the Patent Laws protect me? What easy steps can I take, without cost, to put myself in position to sup- port my belief that I am the first man to think of my invention? Is a Patent worth the cost? MAIL THIS at COUPON TODAY ¥ Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 7 You may not be an Edison or a Kettering but still you may have a good idea Should I try to sell my invention before I have it Patented? Is there any safe, business-like way to secure financial help? If I do apply for a Patent how shall I reach people who can mar- ket my invention? Can I protect and sell an improvement on some invention that has al- ready been Patented? These are but a few of the questions which usually confront the aver- age man. You need the answers! YOU CAN HAVE THEM, without cost, trouble, or delay, Our Business is To Help You—Write Us Today For more than thirty-seven years, this firm has been helping men with an inventive turn of mind. We maintain a large staff of trained, experienced specialists—Registered Patent Attorneys, Drafts- men, and Searchers to help our clients secure all the Protection to which they are entitled. Fees are reasonable, Deferred payments frequently arranged. Questions promptly answered. Write us frankly with absolute assurance that what you say will he treated with strictest secrecy. But first send for the FREE BOOKS shown on these two pages. They are filled with facts, pictures and suggestions. They tell you things about Patents, Inventions and Selling Inventions that we have learned in our long experi- ence. They may save you time, expense, EVEN LATER DISAPPOINTMENT. Simply fill in the coupon or write us a confidential letter, No charge, victor J. no obligation. Mail the coupon today. RECISTERED PATENT ATTORNEYS MAIN OFFICE: 720-K, VICTOR BUILDING, WASHINGTON, D. C. 1007-B, Woolworth Bldg., New York 1445-B, Monadnock Bldg., Chicago 514B, Empire Bidg., Pittsburgh 1010-B Hobart Bidg., San Francisco 736-B, Security Bldg., Los Angeles Other Offices: Send me FREE copies of your books, “Patent Protection” and “When and How to Sell an Invention.” (Note: Same books sup- plied by any of branch offices listed above.) Ciy or Tonn opasan b

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Low. COST PURCHASE PLAN! AT LAST anyone can own a New Royal Port- able Typewriter! Prices are low now and terms are easy— only a few cents a day! Brand-New Genuine Latest Model NEW ROYAL PORTABLE GREATEST VALUE ` IN ROYAL'S HISTORY! With many exclusive improvements, including Touch Control—“‘it adapts the key-tension to your exact finger- pressure;” Finger Comfort Keys; Standard Office-style Keyboard, Easy to use. Perfect for student, teacher, or business man, ACT QUICKLY! LEARN TOUCH TYPING FREE! this summer. Type like an e ae in the fall, be ready for school or business. Royal’s simple system shows you how —free with every New Royal Portable. CARRYING CASE, Handsome. Compact, Typewriter easily and quickly removed. May also be used as extra luggage case. *Trade-mark for key-tension device. Don't Delay -MAIL TODAY! Royal Typewriter Company, Inc., Dept. MM-96 2 Park Avenue, New York City Please give me details concerning special low-cost purchase plan on New Royal Portable. Quote trade-in allowance on my........ Takes Typewriter, serial number.......... Name. Street, City Stat Big Pay Opportunities in aviation for Service Men chanics and Pilots. The aviat industry is having wreatest increase of business in its history. Aircraft fac- tories throughout the country are working overtime filling huge orders for new airplanes, This means thousands of new jobs for men with proper traine ing a as Lincoln gives you, GOVERNMENT APPROVED SCHOOL Fiinhe Course gives you ree quired training for Government Pilot's license. Mechanic's Course wives you required training, for Government Airplane and Engine Mechanic's Lie cense. Special course in Sheet letal Training, Finest modern equipment, High class instructors, Lincoln graduates employed by leading alr- Ties, factories, airports and serv- ice stations. ‘Others in demand. Now in 26th year; 16 years teache ing aviation, Start training at Lincoln now for Success! ul aviation career. Special part-time employment offer for a few men to pay board and room while training. WRITE tuday. Please state age. LINCOLN AIRPLANE & FLYING SCHOOL d Division of Lincoln Aeronautical Institute, 403F Aircrafi Bldg., Lincoln, Nebr. A MONTH That’ 5, the kind of g pay carted: by air- line Pilots! Airplane me chanics als earn good sake aries! CONTENTS—Continued from page 4 SHORTER FEATURES Frontiers of Science—A Guest Editorial - By David Sarnoff , Winners in MM Auto Contest - = = > Paddle Plane Built on Flapping Wing Principle - Se Sy ee, ele Housewives Inspire Home Improvements Needed Inventions Winners Suggest New Ideas - - - = = = = - = = = Stamina is Built Into Training Planes =- Astronomers Study Radio Interference =- He Finds Music in Plumbing Tools - =- New Stunts for the Auto Machanic - - Mystifying with Chemkkal Magic - - » HOW-TO-BUILD FEATURES Auto Parts Make Efficient Windcharger Plants - - - - - - - - = = >» Checking the Car for Elusive Engine Noises Pull-Cord Control Opens Garage Doors Inlaying With Colored Sealing Wax - - A Midget Foot-Powered Locomotive Boys Can Make - - - - =- - >=- = = Practical Modern Furniture for the Workshop Fan - - - - - = = = Turning Clay Projects on a Potters Wheel A Lead Plate Bud Vase - - - - =- “MM Master” Metal Tube Sound System 33 35 68 74 75 78 86 88 102 103 90 92 96 98 100 104 108 110 112 NEW MECHANICAL INVENTIONS Slot Machine Yields Fishing Worms - Swiss Power Plant Fulfills Prophecy - Hangers Help Sell Airplanes - - - -= Wooden Safes Protect From Fire - =- Super-Flying Boat Powered With 800 H. P, Motors - - - - - = =- = = > Tractor Fires Fuel With Spark - - =- Wooden Radio Tower Improves Reception Putting Machine Improves Stroke - - - Army Tanks Crush Obstacles at 70 M.P.H. Wind Marker Flush With Runway - - Model Locomotive Wins Honors - - - 50,000 Watts Consumed by Giant Light Three Colors Form Airport Light - - Speedometer for Train Passengers New Metal Turns Glass Like Wood - =- Lawn Sprinkler Pulls Itself Along - =- Compass Shows Change of Course = œ Rubberized Fabric Covers Balloons - = New Strato Rocket Claims 200-Mile Ceiling [Continued on page 12] & Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 34 40 40 40 41 41 44 44 45 45 45 30 50 5l 55 55 59 59 63

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OW is the time/ Business is Searching we eee. for YOU, if.... IGHT now, in many lines, there is a search for really good men—managers, leaders— men who can take charge of departments, busi- nesses, branch offices, and get things humming. As always, there are not enough ordinary jobs to go ’round—but rarely before, in the history of American business, has there been so much room at the fop! New jobs are being created by the business pick-up in almost all lines—jobs that pay splendidly and that open the way to lifetime success. Ordinarily, there would be plenty of men to fill these jobs—men in junior positions who had been studying in spare time. But most men have been letting their training slide during these dark years of depression... . “What’s the use?”’—You have heard them say, Perhaps there has been some excuse for sticking to any old kind of a job one could get the past few years—but the door is wide open for the man with ambition and ability NOW! And don’t let anyone tell you that ‘“‘Oppor- tunity Only Knocks Once”—that’s one of the most untruthful sayings ever circulated. Op- LA SALLE EXTENSION UNIVERSITY, Dept. 9493-R, Chicago T am in earnest about my success and I would like to have your special booklet—without any cost or obligation to me—about my opportunitics and your success training in the business field I have checked. O Business Management O Higher Accountancy O Traffic Management O Modern Salesmanship O Commercial Law O Law: Degree of LL. B, DO Expert Bookkeeping O C, P, A. Coaching O Modern Foremanship © Business English O Effective Speaking O Office Management O Stenotypy Paa Address O Industrial Management O Personnel Management O Business Correspondence LaSalle Extension University: portunities flourish for every American every day of his life. Far more to the point is to be ready—to be prepared—to make yourself interesting to the big-time employer—and LaSalle offers you a short-cut method of qualifying for opportunity jobs in accounting, law, traffic, executive man- agement, and kindred occupations. LaSalle Extension University is 28 years old —averages 40,000 enrollments a year—60 American firms each employ 500 or more LaSalle-trained men—surveys show that LaSalle students attain 40% average salary increase after graduation—10% ofall C. P. A.’s in the U.S, A. are LaSalle-trained. Why not find out what LaSalle has done and is doing for men in your position? Send and get the facts; see what LaSalle can do for you, personally! There’s no question about it—business is picking up—jobs are looking for men—the time has come for you to qualify for prosperity. Mail this coupon today! Ask for one of these booklets—or a similar onc on your own field vf business. They are free! Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 9

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IDEAS do not have to be complicated to be profitable when Patented. The 5c and 10c stores flourish on simple Patented products which are commercially success- ful. The zipper, safety pin, thumb tack, paper clip, collar button—all simple, yet familiar inventions—brought their THAT HAV E inventors rich rewards. If you have a Patentable idea—act to protect it. Many of the most 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 idea may become : : a utility bought by a hundred thousand or a million people B U 5 l N E 5 5 ES soon after it is produced, Don’t be afraid that the simplicity of your idea 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 invention with only a poor boy’s start is a very long and noble one. Pov- erty, hardships, lack of friends, distance from the market—these could not hold back Bell, Edison, East- man, McCormick, Whitney and others. Everyone cannot succeed. But every man can try. Courage, sacrifice, and hard work may bring you a measure of The Biography of the success these men had. Lack of mechanical ability George Eastman is not a serious draw-back. You can always get Views of the man who someone able to build a model, draw a detailed design, 24 Patent Protec- a EAS : : tion to amass mil- or otherwise materialize your idea for you. The big lions and give draw-back is discouragement. perfection to a Your idea for a practical article or an improvement upon an new art — Photo- old one should be patented NOW. Frequently many of the graphy— itself thousands of applications filed in the U. S. Patent Office each one of the year are for the same or almost the same idea. In such a case, greatest in- the burden of proof rests with the last application filed. Some- ventions. times a delay of even a few days in filing the application means the total loss of the patent. LOSE NO TIME. The entire time of this large and experienced organization is devoted exclu- sively to patent and trade-mark cases, We know the rules and requirements of the Patent Office. We understand the technicalities of Patent Law. We can proceed in the quickest and safest wəys in preparing an application for a patent covering your idea. CLARENCE A.O BRIEN & HYMAN BERMAN Registered Patent Attorneys Before U. S. Patent Office 317-L ADAMS BUILDING WASHINGTON, D. €. BUILT BIG 10 Thank You for Mentioning Moderu Mechanix Hobbies and Inventions When Writing to Advertisers

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det Now TO PROTECT YOUR © |” IDEAS : WITH A U.S. PATENT Send For FREE BO If you have a new idea that is patentable—and want to secure for yourself your inventor’s sole right to profit from the idea—you can’t afford to lose time in secur- ing the protection of a U.S. Patent. Other inventors may be working on the same idea right now. Should they develop this idea 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 pos- sible way to secure Patent Protection for your idea. SEND FOR IT TODAY! TheFIRST IMPORTANT STEP in SE- CURING A PATENT—is to obtain the services of a Registered Patent Attorney. Free Record of The U. S. Patent Office advises that you secure the aid of an experienced Regis- tered Patent Attorney to prepare your statements. Establish the date of your invention as explained in our book and disclose your idea to him in correct form. He then makes a SEARCH of the Patent Office Records and reports to you on exist- ing U. S. Patents which might bear on your invention, giving his opinion on the advisability of proceeding and filing for- mal application, REASONABLE FEES - CONVENIENT TERMS. Don't worry about finances. Our fees are very reasonable—we can arrange convenient terms of payment. It is our custom to permit clients to pay for our services in installments as the application progresses in our office. See our Big Book for fees in obtaining Pat- ent. It explains our arrangements clearly. Send for it NOW! Invention Form Use our FREE “Record of Inven- tion” form to assist you in record- ing the descriptive outline of your ideas and to establish the date of your invention, With it you can make a rough sketch o your idea and have it wit- nessed in a manner of value to you as evi- dence should occa- CLARENCE A. O'BRIEN @ AND HYMAN BERMAN TEAR orr? Registered Patent Attorneys AND $ 317-L Adams Building MAIL > WASHINGTON, D. C. NOW.: Q Please send me at once your Big Free 48- Q Page Book, “Patent Guide for the Inventor” Ss and your Specially Prepared “Record of Invention” form. Also George Eastman É Biography, ‘Inventor and Business Man.” This request does not obligate me. f (Please write or print plainly) Thank Vou for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers il

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Milwaukee Manulecturess mey Electric Are Welding in their laboratories at the School of Engl- neering. Moderate training Fee. Accepted applicants will be fully tained until ready to pass rigld test and assisted In securing employment. Arc Welding presents one of the outstanding op- portunities for steady income and Tutor success. Welding is vowing E . . rapidly, replacing: large, and Intricate castings, rivets, nuts, bolts, screws. n g ineerin g is commonly used in assembling cranes, hoists, bridges, structura steel work, cte. No limit to the application of welding to indus- try, increasing durability and reducing manufacturing cost. There 1s a decided shortage of properly “trained Weldi ing Operators. Technicians and Welding Engineers. Why be content with ordinary work, hit or miss jobs and low pay, when in a short time you can become a tralned Specialist in Welding? wm MILWA UK E Eset ACHAL of ENGINEERING Juastitute of Electrotechnics Founded 1903 MM-936 Broadway and E. State, Milwaukee, Wis. Without obligation send me FREE BOOKLET ‘‘The Dawn of a Gigantic Industry and its Outstanding Spportunities,” also tell me how to become a — Welding Operator (3 mos --- -Welding Technician (6 mos.) ~...Commercial Welding Engineer Q yr.) ==- -Electrical Engineer B. S. Degree (4 yr ----Commercial Electrical Engineer a yr. -Radio ‘and Television Engineer A yt) -Refrigeration and Air Conditioning Engineer (1 yr.) -+--Radlo Service Man (6 mos.) ----Master I:lectriclan (G mos. DEVELOP £ PRINT Sw SNA Save One Half / money you save developing, printing your own pictures, Fascinating hobby. Profitable, too! No experience needed to operate this professional outfit in- | cluding electric ruby lamp, developing ays chemicals, r, zranuate stir Tod, comp lete” easy 'alrection: $2.65 value now only 49 Postal for cash ov pay postman han pee ($1.49 plus postage outside U. atisfactlon or . Wr ite tor PRES PHOLOGRAPHIG ALN ok of Cameras & Supplies. RUSH your eran in toda ‘and start printing your own pictures right away! RAL CAMERA co. (Est. 1899), 230 S. Wabash, Dept. J-9, On ANT

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CONTENTS —Continued from page 8 Silos Become Observation Towers - - - 63 Fire Alarms Flashed by Radio - - =- - 66 Speed Boat Modeled After Seaplane - - 66 Vibrations Photographed with Light Ray - 67 Fused Panels Replace Painted Walls - - 67 Giant Crane to Swing Giant Transformers - 69 Guns Ride to Maneuvers by Rail - - = = 69

Invents Fire Nozzle and Truck - - = = = 76 Poland Vies for Trade with Motor Liner ~ = 76 Woman Invents Foot Brake Catch =- = = 76 Hop, Skip, Jump Launch Glider Plan +- =- =- 77 Life Preserver Worn Like Collar = =e e =- 77 New Device Sends Colors by Wire =- = = 77 Fire Fighters Use Knapsack Radio e = = 79 New Ride Thriller Loops the Loop =- e = 79 Mirror Delivers Sales Talk - - = = a = 84 Casting Turns Out to be Monster = = e =- 84 Marooned Men Build Catamaran - = = =- 84 New Grappler has Sighting Tube - =- = -~ 85 Radio Telephone Solves Railroad Problem - 87 Camera Shoots Inside of Oil Well - = = =- 87 Novel Gun is Death on Flies - - - <= - 87 Vertiplane’s Wing Locks in Place - = - 89 INTERESTING SCIENTIFIC ITEMS Short-Wave Radio Protects Lightship from Ramming - - - - = 34 Student Makes Smallest Radio Tube - - - 4l Austrian Chemist Makes Synthetic Coffee - 50 Science on Parade at Paris Exposition - - 51 Blood-Making Bottle Newest Robot - - - 51 Brilliant New Comet Found by Garageman - 55 Bacteria-Killing Tube Sterilizes Air - - =- 58 Hordes of Caterpillars Invade Homes- - - 59 Serves Same Railroad for 81 Years - - - 63 Key Found to Long Range Forecasts - - = 66 New Observatory Built in Miniature - - - 67 Modernistic Birdhouses Win Prizes - - = 69 Attic Silkworms Forecast $100, 000, :000 Industry - - - - - =- «= 79 Astronomer Builds Transit to Survey Universe - - - = = = = 85 Atom Gun Will War on Cancer - - 85 Denmark-Sweden Bridge Spans Famous Inlet 89 Life Saving a One-Man Operation - - 89 FOR THE WORKSHOP FAN A Swing Desk-Stand for Your Typewriter Modern Lawn Chair Easily Built - - - 94 Light Socket Forms Handy Switch - =- - 94 Handy Trailers Speed Bicycle Deliveries - 95 Simple Press Prints Book Pages - - =- =- 95 Telescopic Finder Improves Camera Pictures 99 Film Pack Serves as Novel Printer - - - 99 Box Camera Takes Aerial Photos - - =- = 99 A Low-Cost Boom for Sailboats - - - 107 Hinged Rudder Prevents Damage - - = - 107 Bent Boom Increases Sailing Speed - - -~ 107 Timely Tips for the Home Shopman =- =- - 114 DEPARTMENTS Solving the Reader’s Problems _- - 14 Random Chips from the Editor’s Workbench 18 Nic Sprank - - - - =- = = = = = = 32 Paragraph Oddities - = = = =- = = = 62 Sportsman’s Campfire =- =- = = - ~- - 64 Radio Sparks - - =- = = = = = = -IIl Camera Puzzlers - - =- - =- =- =~ = - 116 New Business Ideas - - - = - - - - 146 ' w A 12 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Lan DIESEL Een zier ot Dlg ser YOU WORK ON FINEST and LATEST QUALIFY FOR artments at National Schools. EQUIPMENT AVAILABLE IN AMERICA GOOD PAY JOBS Fstablished in 1905, National Schools’ course of Diesel Training is the outgrowth ofyears of successful develop- ment. The instruction is PROVEN. Over 30,000 || NATIONAL'S graduates have received National Training. Now, National offers the most comprehensive training— actually two complete courses for the price of one—Gas and Diesel Engineering. Both courses are absolutely Students checking starting unlt on essential to qualify for best jobs. Caterpillar Diesel. Master Training Includes All Phases of Diesel Engines Easy, Fascinating “Shop-Practice’ Method us pe The day you begin your training at National you start right in Butane Engines with a practical job on the most modern Gas and Diesel equip- ment, including Caterpillar, Cummins, McCormick-Deering, Propane Hercules, Venn-Severin, Fairbanks-Morse, Enterprise, and Natural Gas many others. The work is actually a pleasure for students— [fauto-ptesel Electrlos easy to understand—ever-fascinating. You learn in a few months hine Sh what would ordinarily take far longer. Machine Shop No Dummy Equipment at National Batterles The vast installation of modern Gas and Diesel cquipment here Students servicing Fairbanks-Morse 38 all used by you in learning your trade. You learn to assemble Diesel power generating unit. and dis-assemble all parts, learn trouble-shooting; operating and all essentials to qualify you for big-pay Gas and Diesel oppor- tunities. Your instruction is personalized under direct super- vision 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.| We help students obtain part- fare allowed to L. A. from any part | time jobs to carn room and of the U. S. board while learning. NATIONAL SCHOOLS, LOS ANGELES Students making adjustment on Venn- Severin Diescl. ! | Dept. MMA-9, 4000 So. Figueroa St. | l Please send Catalog. l | | NAME casei sataonsannande | a | ADDRESS sumiu EOE peed masman | D o eae Terms ELS emeiaentiey a | eona A Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 13

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MM EDITORS ANSWER READERS’ QUERIES REMOVING PAINT FROM BOAT HULL I intend to repaint my boat this fall before storing it for the winter. Since the paint on the hull has already showed signs of swelling I should like to remove the old paint before applying the new. Can you suggest a suitable paint remover? —J. T. B., Jacksonville, Fla. A suitable paint and varnish solution can be made by dissolving 1 part caustic soda in 5 parts of water adding to this 1 part of mineral oil. The mixture is then boiled until the emulsion forms after which 1 part of fine saw- dust is added to the solution to render it into paste form. The paste is then applied to the old painted surface and allowed to react. After the paint has loosened flush off the paste with clear water. A SOLUTION THAT WILL FROST GLASS I have heard of solutions for rendering trans- parent glass opaque, but don’t know if this is pos- sible. I should like to give several windows in my home a frosted finish so as to improve their ap- pearance. If a formula of this kind is available you may rest assured I’d appreciate knowing about it.—S. L. N., Philadelphia, Pa. Clear glass can be given a frosted appear- ance by applying the following mixture to its surface: 6 oz. magnesium sulphate, 20 oz. water and 2 oz. dextrin. Apply the solution with a soft cloth or brush and allow to dry. The magnesium sulphate will form itself into a frosted crystal effect as it dries. ELIMINATING RADIO INTERFERENCE Although our radio receiver is new and free from any defects we are bothered with static pro- duced by telephone dial clicks and motor noises. Is there any method by which this nuisance can be eliminated or partly silenced?—P. O. N., Eden- ton, N. C. Your local telephone company at your re- quest will install a filter condenser on the 14 telephone causing excessive interference in your neighborhood. There is no charge for this service. Electrical line disturbances can be eliminated in many instances with a choke and condenser filter. Although you can pur- chase a device of this type from any radio shop there is no reason why you can’t make your own. Complete plans on radio noise elimination appear in the Radio Builders Manual, available from MM at 50e postpaid. PARTS SOURCE FOR MIDGET AUTO I plan to construct a midget auto as soon as finances permit and would like to know where the necessary parts can be secured. Must I use special parts in the construction work or can I fashion them from old auto and motorcycle materials? —R. G., Denver, Colo. If you are planning on building a midget auto we advise you build “Midget Miller” which is described in full in the 1936 edition. of our How To Build It book. This racing car, although tiny in size is authentic in construc- tional details and can be built from materials available at any auto graveyard. Either a lawn mower or washing machine gas engine may be used to power it or better still a good outboard motor. A ROAD BED FOR MODEL RAILWAYS I am constructing a model railway of the “oo” gauge type and find difficulty in securing an authentic looking road bed. While roofing paper mounted over a wood foundation is satisfactory for “o” gauge use it doesn’t look natural on the smaller gauge layout. Can you offer a suggestion for making a good imitation road bed on which the tracks can be attached?—S,. D., Ft. Worth, Texas. An authentic looking road bed for your model railway system is not at all hard to make. Secure as many feet of 3” by 12” white pine as your tracks are long then round off the edges with a block plane. Next cut strips of heavy cardboard for the imitation ties, the [Continued on page 16]

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AW, QUIT IT, CANT YOU-just tell the fellows [Im staying home SAY JUDY — WHAT'S DUNNO ~_HE KEPTSAYING EATING NED? WHY E COULDN'T. HE WON'T DIDN'T HE COME DOWN § DO ANYTHING LATELY — WHAT'S GOT INTO }/ WELL TLL BET YOU'D YOU NED ~ WHY'D JJ HAVE STAYED HOME, YOU TURN DOWN TOO, IF YOUR FACE JUDY'S INVITE? WE LOOKED LIKE MINE! HAD A SWELL JUST TAKE A SQUINT AT THESE BLOSSOMS -~NEDS PIMPLY SKIN ! MADE HIM SHUN THE CROWD UNTIL WELL FoR CRYIN'OUT LOUD. S THAT ALL THAT STOPPED YOU? SAY-DON'T YOU KNOW ||- YOU MEAN TO | FUBISCHMANN'S YEAST IS Sr ER, "LL ASK MOM UFE-LNg CAUTION Pony | AIR EXPRESS 4 e week Woe p = Don’t let adolescent pimples spoil. GOT IN Tow A] : YOUR chances for fun IMPLES can be joy- tive skin. Pimples result. killers after the start Fleischmann’s fresh of adolescence—from13to Yeast clears these skin irri- 25; or longer. At thistime, tants out of the blood. important glands develop. Then, the pimples go. Eat Disturbances occur in the 3 cakes daily—plain, or in body. The skin a little water—until your gets oversensi- 9 skin clears. tive. Waste : ri f me eS poisons in f We j . the blood me: clears hE shit irritate eX Y E by clearing skin irritants this sensi- CA out of the blood Copyright 1936, Standard Brendes Incorporated Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 15

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: BE A TRAINED AUTO-DIES Expert -GOOD JoBS— i © - GOOD PAY EARN AS Diesel Power for trucks, busses, tractors, ‘arm power and lighting Plants opens Tich, new fields of opportunity for. nfpopenszic Good jobs, at good pay, awalt those who prepare NOW to getin on the ground floor of this fast-growing industry. And with combined Auto-Diesel ‘‘Job-Way”’ Train- rought to your home by the pioneer antomotive kome-study school, you can train for success in this new field without {caving your present position whilelearning. “Job-Way” Training is Prac- tical, Complete, Modern Our modern, revised Training covers every new development in the operation and re- pair of present day gasoline and Diesel YOU LEARN AT HOME automobiles, trucks, tractore, etc. An the same practical, easy-to- learn method that has started thousands of our graduates toward succese, will qualify you ina few short montha for a better job, or a profitable repair business of yo r OWD. s New Auto- -Diesel Course Included at No Extra Cost tudents enrolling now for our yr regular Antomotiva course get our complete new Auto- -Diesel course AT „NO EXTRA COST. Send Coupon today for details of our You Learn’’ Training plan, backed by fifteen years’ success in the automotive training field. Earn as You Learn—Two Motor Testers Free Just now, we are also including complete, valuable motor testing equipment, to assist your training and enable you to in earning extra apare-time money soon after you enroll. AUTO-DIESEL BOOK FREE Men without Previoug auto experience or special education quickly master “‘Job-Way’’ Training and become akilled ex- perta in every branch of auto work. ig FREE AUTO- DIESEL Book: ang compl Free Employment and Consul! a Service. No obligation! MOTOR INSTITUTE OF AMERICA 4554 Broadway Dept. JD-13 Chicago STOTT atte Cen eem MO! STITUTE OF AMERIC. H Mor? Tn oadway, Dept. JD-13, Chieago, Ii. Without obligating me, send Free Auto-Diesel Book with all U facts about ‘Sob-Way” Home Training and Special O er. GOVE ‘SF JOBS $1260 to ae YEAR MEN—WOMEN 7 Gena Institute Many New Deal appoint- 7; Dept. M264 Rochester, N. Y. ments. Common edu- 7 i “ Gentlemen; Rush to me cation usually suf- s en : t ; ficient Z FREE of charge, list of icient: © U. S. Government big pay Mail Coupon Ry jobs obtainable. Send FREE immediately Ee 32-page book describing salaries, 7 vacations, hours, work, etc. Tell —sure. ; 7 me how to get one of these jobs. 7 An 7 Z Address cesccccicstisesdcctecssdecdseaseediguevesecdvne Aissdace pegs ache i Problems Editor Answers Queries [Continued from page 14] cardboard should be black if possible. Apply a coat of varnish to the white pine and after it has become tacky stick the ties in place. Last of all sprinkle ordinary cement over the assembly and your roadbed is complete. When dry the bronze rails may be attached. STAINING LARGE FLOOR SURFACES Our club recently acquired a medium size dance pavilion with unfinished floors. Can you tell us how to finish the floors as simply as possible so that we will be able to use the pavilion without making a large investment for paint?—Miss D. L., Chi- cago, Iil. Probably the quickest and most inexpensive way to finish your dance floor would be to apply a stain made by dissolving a cup of permanganate potash crystals in a bucket of boiling water and applying this to the flcor with a mop. If the shade is not deep enough apply a second coat then allow to dry. Over this apply a coat of sizing, then prepare your polish. This consists of ordinary bees wax dissolved in turpentine until a rich milky solu- tion is obtained. Apply the polish with a mop and finish with a polisher until a luster is secured. MAKING AN ELECTRIC REFRIGERATOR Is it possible to convert my metal ice box into an electric type refrigerator? I have heard that it can be done but am doubtful about this.—G. F., Troy, Ohio. Any ambitious mechanic can convert his ice box into an electric refrigerator. Plans on this conversion are available in blueprint form from MM at $1.50 per set. MODEL PLANE SHORT CUTS WANTED Having had very little experience in model plane building I’m puzzled as to how I can make authen- tic looking cabin windows. Is there any simple way of increasing the tensile strength of the balsa wood framework without adding too much weight to the plane? How can I make suitable wheels for models; that is wheels that will look much like the real ones?—J. S. P., Johnson City, Tenn. Light celluloid may be glued in place inside the fuselage for the window effect although Cellophane will be found much better for this purpose. The balsa wood frame can be strengthened by coating it with dope. Whecls can be turned from a block of balsa by insert- ing a bolt through the block and fastening in a hand drill. Use a razor held rigid for your cutting tool. (Editors Note: Your questions will be asnwered 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 for reply. Address: Problems Editor, Modern Mechanix Publishing Co., Greenwich, Conn.) 16 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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New 1937 Line to Be Announced Shortly Many important improve- ments and new tools of interest to all will be found in the 1937 xaa Delta Line a “ae Year after year Delta en- gineers continue their work of improving existing models and developing new models of quality, low-cost, motor- driven tools. The coming 1937 season is no exception. Important announcements of new Delta Tools will be re- leased shortly, announce- ments that will be of tremend- ous interest to all those who are contemplating additions 4, The New Delte 10-inch Circular Saw, shown in the to their shop. Before select- eee on ne beeweat Meera ate corivletely equipned ing new tools—be sure to see circular “r yot oered for, the pose work shop, tool shop, Pi tiem shop, contractor ans uilder. t has numerous I in orclusive features that mako it the season’s outstanding tool, the 1937 Delta e. SEND COUPON TODAY! So Your Name Will Be on Our Mailing List The new 1937 Delta Catalog will be off the press soon. It will contain full description, illustrations and photographs of the com- plete Delta Line, including the many new Delta Tools with improve- ments incorporated in the 1937 line. Every man interested in low-cost, quality tools should see the new Delta Catalog. In order to make sure that your name will be placed on the mailing list to receive a copy, send the coupon below today. At the same time enclose only 10c for the new 1937 book of “Prac- tical Delta Projects,” Book No. 3 containing 32 pages of new and novel things to make, with many blue prints, working drawings, photographs, illustrations—and complete directions. e sure to “mail the coupon at once. ¥ New 1937 Project Book CNRS Now out, the new 32-page book CEE A aatec a A T “ i De 77 DELTA MANUFACTURING CO., Dept. No: 3of r Tactical Delta a th | 600-634 E. Vienna Ave., Milwaukee, Wis. l p 3j new a. ut Of the I enclose 10¢ (stamps or coin) for which please | ordinary” things to make—with send me one copy, of the new 1937 Book No. 3 of | * . Tactical Delta Projects.” so place me on yo many photographs, working drawings, mailing list to receive 1937 Delta catalog of quality l and easy-to-understand illustrations. Simple, complete instructions make motor-driven woodworking tools. every project easy to follow. Every |! woodworker should have this book. Send l Address...... eRETETEPee rrr ee SNES Rae nee cies | 10c with coupon. 1937 Delta catalog CUY a sist eniya Bier oeiinde ded w State... nesses l mailed postpaid. O Check here if you are @ Delta user now. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 17

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Karulong Otjes ptor Here are the three prize-winners in this month’s Workbench contest. Above are Baby Patches and Patches II, built from plans for Tarbaby and Dorothy re- spectively by Richard Glenn, winner of the £5 first prize. At top, right is the Bungalow Camp Trailer and Kyack built from MM plans by Walter Buck, second prize winner, In the circle is Tom Gunderson with his Handy Henry tractor. Tom is winner of third prize. S WAS predicted in the Workbench last month, this summer is finding more activity among MM readers than ever before. With the home workshop waiting, and good plans to work from, the hot summer days seem to be acting as an inspiration rather than a deterrent in getting projects completed. The letters from our readers being even more eloquent on this subject than we are, we shall start right out with one from Richard Glenn, winner of the first prize of $5 in this month’s Workbench Contest. Selfridge Field, Michigan. Dear Editor: May I enter two thoroughbreds? Enclosed find a snap of my Dorothy model sloop and Tarbaby model dingy, Patches II and Baby Patches respectively. Patches II was built to scale other than being shortened 113 inches between the frames as I wanted to stay below the three-ton gross law of the Philippine Government where I was stationed. She carried 320 square feet of canvas, the mast was 32 feet in length and rigged with one-fourth- inch galvanized wire. I used about 750 pounds of con- crete for ballast inside. I had a small 114 horsepower Evinrude two-cycle out- board, about 15 years old, remodeled into an inboard and installed off center on the port side. It gave a speed of close to 5 miles an hour in still water, turning at about 180 R. P. M., which proved that Dorothy needs very little power to move her. OF course I had to add sufficient keel for enough lateral 18 surface to make her work to the windward very nicely, which she would do unless it got too rough. Owing to her narrow beam at the waterline of course she was rather tender, but with plenty of rudder surface she could be straightened up nicely as soon as she got under way. As I will be stationed at Selfridge field now I have in- tentions of building a 27-foot skipjack schooner. Richard Glenn, Sgt. A. C Plans for both Dorothy and Tarbaby appeared in the first edition of How To Build 20 Boats, now out of stock, but they can still be obtained in blue print form. In the July issue the discovery of 200 copies of the first edition of How To Build 20 Boats was announced, and two weeks after it reached the stands, they were all gone. How- ever, the plans are all available in blue print form, and are described in the big free blue print booklet. Send a self-addressed, stamped en- velope if interested. EE The second prize letter in this month’s contest comes from Walter Buck, of San Luis Obispo, Calif. He writes: San Luis Obispo, Cal. Dear Editor: Having been a subscriber to MM for several years, I feel that we have something in common. I want to say your magazine is one of the best on the market for every- one, and especially those fortunate people interested in various hobbies. Although I am a barber in the daytime, I am an ardent wood-worker at night. I have constructed many projects from your magazine, the two largest of which I am enclosing pictures. They are a house trailer weighing 1,000 pounds, constructed at a cost of $70, and an Eskimo kyack constructed at a cost of $20. In a recent issue I saw a trailer constructed from the same plans as mine (Bungalow Camp Trailer), but the total cost was given as $215. There being considerable diference in our costs, I thought you. might be interested in our comparison. Walter F. Buck. Modern Mechanix Hobbies &

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tye dior Worbborcf For fast work, Tom Gunderson, of Red Lake Falls, Minn., comes forward to take third prize with his Handy Henry Tractor. Plans for this tractor were published in the July MM, and a month later found Tom with his tractor com- pleted. These three prizes of $5, $3 and $2 respec- tively are awarded each month to readers sending in the best letters, accompanied by photographs, describing their work with MM projects. The contest is open to everyone. Remember in writing that the editors always want to know which articles you liked most and which you liked least in the current issues of MM. Tom’s letter follows: Red Lake Falls, Minn. Dear Editor: Enclosed are pictures of my Model T Ford Tractor. I am very well pleased with what I can do with her. I believe it will last longer than other outfits I have seen, and it cost me only $15. I did not follow the plans exactly as I used an old Reo transmission in place of the Dodge specified. I did not Winners of Soapbox Derby Contest The first prize of a Soapbox racer, complete with a full set of doenut tired wheels, goes to Billie Joe Neil, 309 E. 3d St., Bloomington, Ind. From the letters in the words “Hobbies and Inventions,” Billie gathered 2661 words. Arthur Santmier, 126 Smithfield Road, Woonsocket, R. I., is the winner of second prize, a “trike-wheeled” Soapbox racer. The third prize, a set of four doenut tired wheels, goes to H. B. Baker, Box 242, Morro Bay, Cal. raise up the rear end, but lowered the front end. I also left the tractor, full length of Ford frame but plan to shorten it as well as the front axle. It sure has plenty of power. I put on a box behind to put in sand to give better traction. 1 like all your mechanical plans but I miss your airplane stuff, I like least the indoor projects. Tom Gunderson. kik The old adage that “many hands make light work” is aptly demonstrated by the ever-active Hi-N-Dri Yacht Club of Los Angeles, charter members of the Society of Modern Mechanix and Inventions. Co-operation is the secret behind the success of their organization, and that they are successful is clearly shown by the following letter from David Forsyth, Commodore: Inventions, September, 1936 Los Angeles, Cal. Dear Editor: Greetings and salutations from Chapter 12, Society of Modern Mechanix and Inventors. We haven't heard much from the other chapters lately but these pictures will show that this chapter is still on its toes and going strong. The display was placed in one of the windows of our local papers to show the people that besides racing and building boats our members do and make other things. It created a lot of curiosity and interest. The other chapters might use the same idea; publicity never hurts any organi- zation. This year’s officers are: [Continued on page 20] Alex Irving, Vice Commodore; The Hi-N-Dri Yacht Club of Los Angeles recently staged this exhibit of their workmanship in the window of their local newspaper. Fleet officers for the next year will be left to right, standing, Fleet Captain Albert Holt, and Secretary Wayne Scott. Seated are Vice Commodore Alex Irving, Com- modore David Forsythe, and Rear Commodore Robert Butte. 19

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Talking Pictures offer excellent on- Portunities to trained experts, Com- plete course at National Schools qualifies you to accept positions in toen tora, Newest equipment to learn with. Aladio Transcription Recording is a faselnating profession. The field of opportunity for trained men is un- limited. At National Schools you receive the most complete instruction 3n newest equipment. Experienced instructors. Students learn on same equipment used ìn largest t rip- tlon studios. ene All of the science of sound is based on RADIO. National Schools’ course of training embodies all divisions of Radio, including Television in its latest development. Graduates are qualifed for Radio engincerlng, home, auto and commercial radio re- pairing, and Broadcasting. Easy “shop-and-studio’’ practice methods. No dry text books. Students actually operate our own Radio and Television equipment. You don't need advanced education. National’s training methods teach you the practical way. QUALIFY FOR GOOD JOBS IN FEW MONTHS National training is thorough. Finest equipment in America. Proven methods. When you graduate you can command jobs that assure future success. Earn Room and Board While Learning We assist students to obtain part-time jobs while learning. For limited time we wiil allow coach railroad fare to L. A. Send coupon for Catalog. NATIONAL SCHOOLS LOS ANGELES More than 30,000 Graduates Established 1905 a 1 REQUEST FOR BOOK : ' « NATIONAL SCHOOLS i | Dept. MMR-9, 4000 S. Figueroa St., Los Angeles, Calif. | ' 7 |] l KAME siian e A as wi ' t ADDRESS oo. ATO a E T i À . ( i CITY socccatasamnedey Tar vee STATE occ! biome ww we me eee mn ce mee me wee we owen em — eee. Chips from the Editor’s Workbench [Continued from page 19] Robert Butte, Rear Commodore; Albert Holt, Fleet Captain, and Wayne Scott, Secretary. I was re-elected Commodore. We are all working together to make this our biggest year, and from all indications, it will be. The club is sending several boats to the Coronado Yacht Club races the latter part of this month to see if we can bring home scme of their silverware. Our annual Small Boat race to Catalina was held July 4th. Our entries were smaller this year as most of the fellows are gradually getting larger boats. By the way, according to our news agent we have sold more copies of How To Build 20 Boats than any other store in town with the exception of one down town store. Our drug store is about 4 miles out from the central shopping district. . David Forsyth, Commodore, Hi-N-Dri Yacht Club. $ AESA A pain The Centinela Valley Model Railroad is the name of this “in-place” line operated by Leo Ridgman. It includes 166 feet of track, 18 locomotives, 58 cars, wrecking cart and crane. woke Another California group which is finding co- operation stimulates activity is the Centinela Valley Model Railroad of Hawthorne, Calif. This unique organization, which meets to compare notes, plan new railroads and swap “rolling stock” consists of 19 members, all devotees of “Tinplate” railroading. In addition the organization is the parent of Model Railroaders Digest, a miniature magazine devoted to “tinplate” railroading. Lee P. Ridgman is editor and publisher of the magazine, which is already going out to tinplaters in all parts of the country. As secretary and editor Mr. Ridgman welcomes inquiries. California is not the only state enjoying club activity. The Five Star MM Club of Haverhill, Mass., has just added Robert Dube, Paul B. Magee and Max Wolf to its membership rolls during the past month. Reginald Dawkins is president, and has planned a full-sized program for the coming months. Clubs or groups desiring to become affiliated with the International Society of Modern Mechanix and Inventors and partake of its advan- tages should drop a line to the Society’s head- quarters, at 22 West Putnam St., Greenwich, Conn. Everything is free. [Continued on page 23] 29 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Is Your Job Safe Just as the gasoline engine changed or wiped out the jobs of thousands who depended on horse-drawn vehicles for their living—just as electricity changed the entire set-up in the fields of light and power —so now the Diesel engine is fast invading both the power and transportation fields, and threatening the present jobs of thousands of workers. Ifjobs in your line are stcadi- ly growing scarcer, you owe it to yourself to investigate this : ; new, progressive, uncrowded m : i line, that will offer good open- i i ings for many years to come Diesel—The Newest, Fastest-Growing Power i 4 —_ i H 4 Now is your chance to get into a big new industry and grow up witi 4 Diesel engines because of their high efficiency, de- it to an important position, Today there is practically no con pet į pendability, and economy of operation—are fast replac- tion in the Diesel field, but the increasing use of Diesel engines wil ing steam and gasoline engines in power plants, motor trucks and result in keen competition for jobs in the near future. By startin, busses, locomotives and ships, aircraft, tractors, dredges, Your training now, you can keep ahead of such competition. drills, pumps, etc.—opening up an increasing number of well- i i ers paid jobs for Diesel-trained men. The field of Diesel Engineer- Get oa Aha t This New Field O tf ers You newest. ing is on the upgrade and continually expanding. It will pro- fastest-growing line—its opportunities and requirements. Find out vide steady employment and advancement for those properly what the Diesel field offers you—how rapidly the Dicsel industry trained in this new industry—as long as they need to work. has developed during the last three years—the large number of pou get complete information on all the latest Diesel de- Diesel engines and accessories being manufactured Today he picky g velopments—two- and four-stroke cycles; low- and high-speed Yow can obtain a complete understanding of Diesel engin Hepes and heavy-duty types; Diesel-electric generating systems, etc, 274 operation by home study during your spare time—without inter í : 5 > h Fering with your regular work. = —in our course. Includes all text material—with special dia- “Asking for information involves no obligation — but it may mark grams for quick understanding of this new power. the turning point in your life. Write TODAY [or full information. American School, Dept. D-628, Drexel Avenue at 58th Street, Chicago, Illinois Turn Your Spare Time into Dollars BACK YARD Pair of breeders lay 10,000 eggs yearly! Frogs sell up to $5.00 per dozen. WE BUY! MARKET WAITING. Any climate suitable, No experience necessary. Shallow pond starts you. Nutond Giants Write today for complete, il- Weigh up3ibs. lystrated literature and FREE FROG BOOK! AMERICAN FROG CANNING CO.Dept.119 -$ NewOrleans,La: arr AUTOPOWER ones The new “1936” edition of “AUTOPOWER” with all the original specifications and many new ones 1s now off the press. The book is plainly written and illustrated—the instructions easy and simple. Change auto generators into practical A. 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, water, fan-belt, ete. $500 IN PRIZES GIVEN TO THE READERS OF “AUTOPOWEN.” Send for your copy today. Price only $1 postpaid. AUTOPOWER, INC. Dept. B 412 S. Hoyne Ave., Chicaga Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 21

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$8250: COMPLETE AS SHOWN is MOTOR They're all talking about it—master craftsmen, work shop specialists, users of fine precislon equipment— because never before has such a modern back-geared screw-cutting lathe been offered at such a price. 10” swing. built-in ad- Justable counter-shaft, V- belt drive, automatically reversible power feeds. Cuts 4 to 96 threads per inch, .001 accuracy. Sold on easy terms with 2 weeks trial. Send coupon TO- DAY for catalog of lathes, drill presses, and tools. FREE CATALOG ee ma a m a a ma. m e, D, m, p a, a, a s Please send your latest catalog. $14.45 to | $39.45 | st ATA%¢ Per sew Hour? A AMAZING INVENTION— New Radi- /. ant Heater. Burns 964 air. Makes its own gas, No piping. Noinstallation. Gives roomful of clean, healthful, penetrating heat, Jike sunshine, for 114 cents an hour. Hotter than gas orelectricity, at 1-10th the cost. Easy to light and operate. No smoke. No soot or ashes. No odor. Portabla—carry it anywhere. Low priced. Guaranteed. 30-DAYS’ TRIAL it 30 days Liberal Offer. Try i at our expense. Write atance for special, introductory, low-price offer and no-risk trial opportu- nity. No obligation, Send today. THE AKRON LAMP CO. 1169 High Street, Akron, Ohio AGENTS! Make big You get one—Your friends get one—wlthout cost. Let us give you the detalls of this amazing Time Teller. Also it can pay you big mones giving it away free. Nothing to buy or sell! Write fast. GARDEN CITY NOVELTY CO., 4304 Ravenswood Ave. Chicago, UII. 2 togaA Splendid opportunities. Prepare quickly in spare time. Easy method, No previous experience necessary, common schoo! education suHicient. Many earn while learning. Send for free booklet ‘Opportunities in Modern Photography i particulars and requirements. | AMERICAN SCHOOL OF PHOTOGRAPHY | M 3601 Michigan Avenue Dept. 2059 Chicage, Illinois City and State -.._.--... ameseannornnanenennnnen=m ATLAS PRESS CO., 952 N. Pitcher Ste Kalamazoo, ORGANICS & WELDERS Auto Mechanics and Welders are in big de- mand. Complete courses in are and 7 | Write acetylene welding, metal finishing, body and fender humping, spray paint- for ing. Special low rates. Write today. FREE MICHIGAN TRADE SCHOOL CIRCULAR 3763 Woodward Ave.. Detroit, Mich. How To Secure A Government Posi Why worry about strikes, layoffs, hard times? Traln now for a Government job. Increased sal- aries, stendy work, travel, good pay. Let me help you become a Rallway Postal Clerk, Post Office Clerk, City Mall Carrier, Rural Carrler— or help you get into any other Government job you want, I was a Secretary Examiner of Civil Service Commission for 8 years. Have helped thousands. My 32-page book Now FRE tells about Government jobs— and how I help to qualify you to get one. Send the coupon for your copy TODAY. a, R. Patterson, Civil Service Expert PATTERSON SCHOOL, 439 Case Bldg., Rochester, N. Y. Send, without obligation, free book ‘‘How to Secure Government Pos!tion,”* Get Rid of the Spectacle Handicap The Natural Eyesight System tells how to do it at home. Full information FREE. NATURAL EYESIGHT INSTITUTE, Inc. Dept. 69-B Los Angeles, Calif. WHY NOT RADIO FOR A HOBBY? Have you a hobby? If not why not become a radio experimenter. What a thrill to hear foreign broadcasts on a set built by yourself. Start today by sending 50c for a copy of the big 148-page Radio Builders’ Manual. Contains plans for building sets of from 1 to 6 tubes. MODERN MECHANIX PUBL. CO., GREENWICH, CONN. DIESEL« GASOLINE - KEROSENE i Enclosed o Self-Oiling e Roller Beari A'size and style for every purpose. Most economical power for farm or factory, Put one to work and watch it pay foritself. Sold Direct From Factory to You! Write today for FREE Catalog Immediate Delivery. WITTE ENGINE WORKS 1576 Qakland Ave. KANSAS CITY, MO. 2551 So. 2nd St. HARRISBURG, PA. 22 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Chips from the Editor’s Workbench [Continued from page 20] Using MM- plans for a full sized Spanish bungalow, Everett Saggus built this model to see if it looked as good as the plans. Balsa wood and corrugated paper furnished materials. One way of determining what your future home is to look like is to see it in model form first. Everett W. Saggus of Warrenton, Ga., working from MM plans for a Spanish type bungalow, built a scale model of it first and found it to be just what he wanted. ae ote ae Random Chips: John Wages, Canton, Ill., writes, “Had a lot of pleasure building Sunray (15-foot sloop) from your plans and more now sailing it. I used Duco White on the sides, and she gleams like porcelain. After having one deck covering crack or alligator, I used nitrate dope on the next, soaking the deck first and then laying the canvas while wet. I applied three more coats of dope and finished with three coats of Duco Nile Green.” From Lee’s Summit, Mo., Norman Wilt writes to describe his version of Handy Henry tractor, “We built it of a Star 4. It has a Republic truck differential and a Star transmission. It weighs about 1,200 and will pull a three- or four- horse load.” Jack Story of Butte, Neb., is another midget car fan. He says, “I went through all the MM’s from 1933 on, got all the car plans, and used what suited my purpose best. The result was successful.” te os as The new Workshop photo contest announced last month is now in full swing, with September 1 as the last day on which entries can be mailed. If you haven’t submitted your photo yet, it’s time to get busy. What the judges want is a photo- graph of your workshop, showing its layout and your equipment to best advantage. If you have discovered a way of making a small space do a great deal of work, be sure your photograph brings that point out. Use photoflood lamps or photoflash bulbs to insure good results. There is a first prize of $15, a second prize of $5 and five third prizes of $1 each. As many of the photos will be published in MM as possible. Arrest Him, Officer! PLL HAVE COMPLETE FACTS ON THE OTHER FELLOW TONIGHT! Follow This 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— The Confidential Reports FRE No. 38 Made to His Chief And the best part of it all is this—it may open your 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! Travel! A regular monthly salary. Reward money. And remember: graduates of this school HEAD 47% of ali 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. 2356 Chicago, Illinois fastened AOE ORG OA alee ell alates | a . . . E Institute of Applied Science R : 1920 Sunnyside Ave., Dept. 2356, Chicago, Illinois : E Gentlemen:—Without any obligation whatsoever, send B E me the Reports of Operator No. 38, also your illustrated § E Free Book on Finger Prints and your low prices and @ E Easy Terms Offer. Literature will NOT be sent to hoys § = under 17 years of age, a L] Í Name re ee ee nae eo H r a 8 BLS eter cue Spa sant E EEE EA H E ë H ` _ _. & ROUSSE ERAS ae. | Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 23

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AUDELS Carpenters | for..BiG Money-Making. Doing ALL Work and Builders Guides 4 vols.$6 Inside Trada Information for Carpentera, Builders, Join- ers, Building Mechanies and all Woodworkers. Theso Guides give you the short-cut instructions that you want— including new methods, idena, solutions, plans, systems and money saving suggestions. An easy progressive course for tha apprentice and student. A practical daily helper and Quick Reference for the master worker, Carpenters every- where are using these Guides as a Helping Hand to Easier Work, Better Work and Bet~ ter Pay. To get this nssist- ance for yourself, Ye finely fil Inside Trade Information On: Pon baai the FR How to use the steel square—How to file and set saws—How to build furniture—How to use a mitre box——How to use the chalk line—How to use rues and seales—Flow to make jointe—Carpentera arithmetic—Solving mensuration problems—Es- timating strength of timbers—How to set girdcra and sills—How to frame houses and roofs—How to estimate costs—IIow to build houses, barns, gar- ages, bungalows, etc.—How to read and draw plans—Drawing up specificalions—How to ex- cavate—Ilow to use settings 12, 13 and 17 on the steel square—How to build hoiats and scaffolds— akylights—How to build steirs—How to put on interior trim—How to hang doors—How to Jath— lay foors—How to paint THEO. AUDEL & CO., 49 W. 23rd St., New York City Mail Audela Carpenters and Builders Guides, 4 vols.. on 7 days’ free trial. If O.R I will remit. $1 in 7 days, and $} monthly until $d ia paid. Otherwise I will return them: No obligation unless 1 am satisfied. Nome. ACArEES. cece cece ere ce ener tenn c enone nes nan ses nee eae esses rene nereeetearntnes . Occupablons. sey ecgeees peeps Ces eh H EH EER Eee ge ERE EWE A eee E REN Reference Make money to” ‘advertising. Prepare quick, a during spare time, Also earn while you learn, No experience necessary. lew, easy method. Nothing else ike it. Send at once for free booklet —‘‘Win Success In Advertising’’, and full particulars, No obligation. Page-Davis School of Advertising 3601 Michigan Avenue, Dept. 2056, Chicago, Illinois, U, S. A. PULVEX Fiea Powder both kills all the fleas on your dog or cat and prevents reinfes- tation for days! Pulvex-ing only twice a month insures against fleas that not only torment your pet but may cause him to become infested with tape worms. Harmless to pets. Itis non-irritating. Backed by 93 years’ experi- ence. Sold on money-back guarantee. At drug, depart- ment and pet stores. In the shaker top can, at 50c. Use ote EIFEL-GEARED @ 2 New Pocket Machine Shops. . 7” and 814” @ lı Takes 7 SQ. FT. OF ‘SPACE and 101 Pictures to show the astound- ing Working Power, Speed and Effi- ciency, and the AMAZING MONEY- MAKING Power..$35 to $100 Weekly.. PLERENCH KIT @ACTTODAY, „and get also Free .. “the world’s Most Useful small tool.” It has. . 2 End,2 Side and 3 Angle Ed turas BREE ofthis Greatest Hand Tool Invention of Screws in ALL Time . . so Don’t expect us totell the All Posi- slory Here; bul..let us send you the tions.. MOST AMAZING Propositions, FREE! $1 wort z+ They will Please and Astound you! en Mail thi this P: Partof Ad T TODAY» with you your r address Gn "a Posteard will 4 | do). Get FREE—101-Picture Manual of Mechanics, with . 1] User Offers, J Or, With.s C DISTRIBUTOR, Territory and FREE KIT Offers. | L Ame PIIERENCH CORP'N_MMI -4809 N. Ashland Aven CHICAGO, ILL. | È pag Only = Corresp ondence Courses in ELECTRICAL ENGINEERIP® Covers, complete, cee "$9 5 ern course, So sin unen anyon 3 i secure future p yone can grasp quickly. Prepares you for RADIO AND ELECTRONIC “ENGINEERING Biaimodetn course in radio, lic address, photo-electrie work, Trains you to be super-service®. aa real vacuum tube tech- nician. Student pln, diploma given. Tuition ONLY $25, cither course, Ask about deferred payment plan. H Send ane, guck for free Eppie or Schgol catalopse az: eS, comp: N] ie} LINCOLN ENGINEERING SCHOOL, 655-24 So. 37th St., Lincoln, Nebr. Do your own printing . . . 9”x12” size sheet or smaller. Duplicate writing, drawlnz, typ- ing. Just the thing for announcements, Menus, bulletins, advertising, price lists . a - Small or medium size businesses. Necessary. Money back guarantee. Outfit includes metal frame, printing fluid. ink, sponge, complete instructions, $1.25 postpaid (cash with order), $1.30 C. O. D. In B.S. A. only. Order NOWI MULTIPRINTER Co. 5712 Woodlawn CHICAGO CORRECTED OR YOUR MONEY BACK GUARANTEED. Van's Salve heals all the way to the roots of the tuni Used in thousands of homes. No fuss—hother—or discomfort. Easy application. Fu'l direct tons with each package. Send $1 today for complete treatment postpaid. VAN’S LABORATORY From Wind Power For Lights, Power, Radio, from Auto Generators. New Copyright Book with over 100 Facts about Wind Chargers. Wind-lropellers- - tions you should know. Including plans for 6 or 32 V. Plant. Send 25c for plans, facts and catalog. ‘Agents wanted. CURRIER MFG. CO. 407 Terminal Minneapolis, Minn. , Ae DUPLICATING OUTFIT! Very handy and compact. Experience un- Da 961 Abstract Bldg. San Jose, Calit. k Generators—Plants—Batteries. Answers all ques- “100 SHOT” REPEATER Latest Model 1936 Haenel repeating i pistol, Sturdy, massive construction. i tA 100 shot magazine. Shoots B. D. steel shot. FREE—500 Shots. BENJAMIN AIR $6: 95 &2.00 deposit PISTOL .177 or .22 cal. —— on C. 0. D. FREE—Folder on Rifles, Pistols, ete. Hudson Sporting Goods, M-52 Warren St., New York © BE A POULTRY EXPERT Make $40, $50, $60 a Week Free book shows how to get started quickly. You'll be surprised at the amazing profit opportunities in the poultry business. Wherever you lire—whatever you do—it is easy to start on a spare or full time basis. Free book tells all, Send for “How to Raise Poultry for Profit.” You learn right at home in spare time by methods endorsed bs colleges and leading poultrymen. Know how to get the maximum profits from interesting, healthy work. Ivon-clad agreement protects you. We have prepared hundreds for sgod jobs and bustnesses of their own. Write now for free book, "No obllgatlon, National Poultry Institute, Inc., Dept. 131-B, Adams Center, N. Y. 24 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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= MANUAL 7A Ta Get your copy of this newest and finest of out- door books now, and make that next vacation a hundred times more enjoyable. In it are those important tricks of camping, fishing, hunting and hiking that prevent disappoint- ments and discomforts. Edited by ROBERT PAGE LINCOLN Hunting and Fishing Editor of Medern Mechanix Hobbies & Inventions Filled with practical advice on every outdoor sport, written by leading experts in each field and edited by one of America’s foremost out- door writers PARTIAL CONTENTS FISHING Unfolding Mysteries of Fly Casting Spinner and Fly Kinks for Pan Fish i How to Use Lures in Au- tumn Fishing for Fresh Water Giants , Choosing ‘‘Sure Shot” Casting Lures Bass and Trout Fishing Do's and Don'ts Tackle for Ocean and Gulf Fishing How to Improve Your Trolling Selecting Bait for Winter Fishing Identifying the Fish You Catch HUNTING Talk Your Ducks Into the Bag Know the Fine Polnts of Duck Shooting Identifying Ducks Training Hunting Dogs Matching Wits with Pheasants Choosing a Gun for Upland Bird Shooting How to Get More Furs Bedding Down the Winter Hunter Preparing Hunting Camps Finding Your Way in the Woods Advantages of .22 Rifles in Hunting Start a Skeet Club CAMPING Camping Without Cooking Utensils Building a Semi-Log Cabin Selecting Your Motor Camplng Tent i Camp Cooking Tips How to Smoke Fish Simplifying Fish Cleaning Bagged Game — Care and Preservation BUILDING PLANS Collapsible Camping Traller “Skedaddle’’ — Simple Out- board Boat Duckhoat Costs $10 16-Foot Canoe Light-Weight Boat Trailer and scores of other big fea- tures and kinks covering avery phase of life in the out- doors. 148 Pages 593 Pictures 50° At Your Newsstand or Order Directly from MODERN MECHANIX PUB. CO. Fawcett Building Greenwich, Conn. | many DIESEL EXPERTS STARTED THEIR CAREERS BY MAILING THIS COUPON @ THE world’s oldest and largest cor- respondence school offers modern training in Diesels — man’s supreme triumph of machine power. America's greatest opportunity for men employed in: Industrial power and lighting plants; small community power and light plants: municipal pumping sta- tions for water supply; on construction work, trucks, tractors, hoists, power shovels, graders; transportation. with special reference to buses, rail buses, locomotives; marine service, including ocean liners, freighters, river and lake vessels, yachts and small cabin cruis- ers. Full information will be sent— free — upon Tequest. INTERNATIONAL CORRESPONDENCE SCHO Box 2318-J, Scranton, Penna. Without cost or obligation, please send me a copy of your booklet, “Who Wins and Why,” and full particulars about the subject before which I have marked X: TECHNICAL AND INDUSTRIAL COURSES O DIESEL POWER O Plumbing D Air Conditioning D Steam Engineer O Steam Electric Engineer O Marine Engineer O Civil Engineer O Highway Iingineer O Bridge Engineer QO Bridge and Building Foreman D Surveying ond Mapping O Refrigeration D Radio O R. R. Locomotives O Air Brakes OR. R. Section Foreman OR. R. Sigualmen O Architect O Architectural Draftsman O Building Estimating O Contractor and Builder D Structural Draftsman D Structural Engineer O Electrical Engineer O Electrice Lighting Q Welding, Electric and Gas O Reading Shop Blueprints O Telegraph Engineer O Telephone Work O Mechanical Engineer O Mechanical Draftsman D Machinist O Toolmaker O Chemistry QO Patternmaker [D Boilermaker O Coal Mining O Sheet Metal Worker O Navigation O Heat Treatment of Metals D Cotton Manufacturing D Management of Inventions O Woolen Manufacturing O Aviation Engines O Agriculture O Fruit Growing O Automobile Mechanic O Poultry Farming BUSINESS TRAINING COURSES O Business Management O Office Management O Industrial Management O Heating O Pharmacy O Business Correspondence O Lettering Show Cards O Stenography and Typing O Traffic Management. U Civil Service O Mail Carrier O Accountancy and C.P.A, O Railway Mail Clerk Coaching O Bookkeeping O Grade School Subjects O Secretarial Work O High School Subjects O Cost Accountant D College Preparatory O Salesmanship O Advertising D First Year College O Signa O Service Station Salesmanship D Illustrating O Spanish D Wallpaper Decorating O Cartooning O lreuch Salesmmanship O Lumber Dealer NG2G..0e0008 ae vunnen aacsucevansnnseuanassnerssseguoseseservenerseneresorsenvenees P- E aana AGGIESS....n0seranacesenernsenscsencesasacsonsecsoasaoneasceae benetnerassessosseraosonerseanee- © cette CIV. creceteecesecssessaeneeenannenennannantecenansenerersneeananens SUGbC se eceeeeeeeeees Present Posittoree....us.cccccorcacecscresaevensenensescnenenssoneseerraraancecarsseesesenrenenes If you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 25

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A:C-RADIO TELEVISION EVERY ELECTRICAL SUBJECT COVERED Here’s great news for anybody interested in Electricity. BRAND NEW edition of Applled Blectricity brought right down to dute with every NEW Electrical subject fully covered. 10 big Volumes and all shipped FREE for examination. BIG FIELD! Big Demand! H } Men who understand electricity Big Pay! are urgently needed right now in thousands of industries. Autos, airplanes, machine shops—practically every in- dustry depends on electricity and men who know this subject make blig moncy. Pleasant, fasclnat- ing work, 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 inthe American Technical Soclety now given free to all readers of this famous Cyclopedia of Elec- tricity. Many say, ‘That’s worth more than cost of books,” AMERICAN TECHNICAL SOCIETY Dept. E-6320, Drexel at SBth St. Chicago 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. American Technical Society, Dept. E-6320, Drexel at 58th St., Chicago Send for 10 days’ free use, BRAND NEW 10 volume set of Plectrical Engineering. In return for mailing this coupon promptly, send free certificate of membership in the American Technical Society entitllug me to full consulting 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 willl send $2.00 after 10 days, then $3.00 a month untill the special price of only $20.80 is paid. AGCICSS) ae m rm a a m ma a a a i sewer nena cs ence ren e a a i a a a a i a a City... Atti Scce caren aa eenmen we ae State.....--.... Please altach letter ptating. age. occupation and name and address of employer and al least one business man as reference. IT’S FUN LEARNING MUSIC THIS QUICK WAY in your own home—no teacher Yes! There’s a way of learning music other than spend- ing years of study and practice. Remember, more than 700,000 men and women have already studied this modern, simple method! Learning music this modern U. S. School of Music Way is easy—fascinating—like playing a game. You learn right in your own home—without a teacher, in your spare time at an average cost of only a few cents a day. First you are told what to do—then a picture shows you how to do it—then you do it yourself and hear it. You learn real tunes from the start. Free Booklet and Demonstration Lesson Decide now to play your favorite instrument. Send for the Free Bcoklet and Free Demonstration lesson explaining this method in detail. Mention your favorite instrument. U. S. School of Music, 2629 Brunswick Bldg., New York City. Instruments supplied when needed—cash or credit. BUILD Your Own AUTO TRAILER FURNITURE ICE BOATS MODELS RADIOS BOATS The 1936 HOW to BUILD IT Tells You How The man or boy with a home shop hobby needs this valuable book. It contains com- plete drawings, photographs, and instruc- tions for building hundreds of projects with ordinary tools. Covers everything from tricks and kinks to dirt track racers. 30° AT YOUR NEWSSTAND OR ORDER FROM MODERN MECHANIX Publishing Company GREENWICH, CONN. 26 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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A Ga Revolutionary 38 $ New-Type OIL Burner Slips Into AnyCook Stove Cooks a Meal for Less Earned Beats any of] burner for low cost, perfect performance — burng cheap oil new way without pre-generating or clogging up — Quick heat by Simple Turn of Valve. TRY AT OUR RISK 30 Days? TRIAL or mod diet of con or wood; cuts fuel bills In half, peys for Itself quickly by what IT SAVES, fared t e FREE SAM PLE Sei man Or woman FOR AGENTS fir “ismonstrare ana take orders. WAITE QUICK. Be firat to learn how to make REAL MONEY spare ar full time — mail lo OWN postcard today. UNITED FACTORIES L-600 Factory Bidg., Kansas City, Mc, _SALESMEN GIG MONEY Clark of Ind., sold 33 in 20 days. Get YOUR oil burner FREE andmake REAL Money. Tite now, STRIPE YOUR OWN AUTOMOBILE | Anyone can stripe a car with a ROLL- A-STRIPE. You can save the price of your striping Job and carn money doing others, Specially knurled roller and dependable gauge. Puint, lac- quer, enamel or varnish may be used. Stripe signs, furniture, models, cte, See any Duco Dealer today or send jë direct. Postpaid $1.50. - MODCRAFT INDUSTRIES, Dept. D-9, 2908 N. Nordica Ave., Chicago, II. Get Set fot Life! = MAKE up to $65 WEEKLY in new kind of wholesale business. Place famous line 5¢e-10c¢ goods with stores. Mer- chants gab our FREE GOODS Deals, 200 fast- selling products—all on salesmaking Counter AMAZING NEW r Displays. Up to 1409 profit for you and BUSINESS Merchant. No experience or investment to start. Big catalog and facts FREE. Sell to Stores BUILD YOUR OWN Electric Outboard Motor from old auto generator, We show you how. Make money building for others. Variable Speed. Light weight and Silent. Op- erates from 8 to 12 hours on ordi- World's Products Co., Dept. 9814, Spencer, Ind. nary storage battery. Dime a brings complete plans and catalog. LEJAY MFG. 1514 W. Lake Minneapolis, Minn. NEW INDUSTRY NEEDS MEN Is This YOUR Opportunity? COMPRESSOR ( CONDENSER ELECTRIC REFRIGERATION— two giant Industries—have need for reliable and properly qualified men tor servicing and installation work., .To meet thia need, men who can moet req::Irement:; are being selected by the Utilities Engineering Institute and fully trained in spuretime for the work involved. Many earn upto $35 and $75 a week. For FREE BOOKLET ninin seemed forester arcu ine iR CONDITIONING and UTILITIES ENGINEERING INSTITUTE Dept. 256 403-410 N. Wells St., CHICAGO, ILL. DIESEL, AVIATION MECHANICS— WELDING OR GENERAL ELECTRICITY— in afew weeks/ Earn $35 to $75 a Week in any of these fascinating well-paying trades. Not a cor- tespondence school—no books—no lessons. Don’t look for a job. TRAIN FOR IT. Read what two McSweeny-trained men have done, Livingston, Texas. Dear Mac: I have been working mighty hard since I gtaduated from your school, with the Ford Motor Co., and am getting along fine. OF course I could not expect top wages at the start. but I have already had one salary increase. So I guess my work is entirely satisfactory, thanks to your school.— Herman Wilson. Clendenin, W. Va. Dear Mac: Send me a cata- log. I just want to look over the old school. I am getting along fine, doing a good business, all thanks to you and your training. Will you send me another Diploma, as mine was de- stroyed. I was in the class of ’21. I send my best re- gards to the instructors and to you, also.—Leo Foreman. A Few Weeks of Interesting Shop Training You work on real equipment with real tools. In a few short weeks you are trained by actual work to hold down a Big Pay Job. DIESEL, AVIATION, AUTO MECHANICS—WELDING OR GENERAL ELECTRICITY— ALL OFFER REAL OPPORTUNITIES FREE {scs about jobs: and Low Tuition Offers. It obligates ME to tell YOU how you can train for Big Money in a few short weeks. Address Dept. 11-33. McSWEENY SCHOOLS Auto, Diesel, Aviation Mechanics—Welding or General Electricity CLEVELAND, OHIO or KANSAS CITY, MO. Write Our School Nearest You—S pecify Course Interested In a Oe ee ee ee ee ee ee ee ee ee ee es McSweeny Auto and Aviation School, l Dept. 11-33, Cleveland, Ohio or Kansas City, Mo. Without esst or obtigation. send me your Big FREE Book on I Aulos; also full infyrmation abuut your Low Tultien Offer. Write today for Big Free Book. Get the i Name

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BUILD YOUR OWN TOOLS Own a complete wood or metal work- ing shop. Use our castings and blue- prints to make your own tools. « y Blueprint portfolio of assembly drawings contains 16 units: Bench Milling Machine— 10” Metal Shaper—Dividing Centers—7” Machine Vise—4” Bench Vise—Bench Drill Press—Floor Drill Press—4” Bench Grinder—6” Bench Grinder —14” Wood Shaper—8” Circular Saw—16” 2-Wheel Band Saw—24” 3-Wheel Band Saw—6” Jointer— Model Steam Engine—7%,” Bore, 2-Cycle Airplane Engine. Prepaid for $1.00 or single prints 10c each. Startling opportunity to build and sell these tools at an attractive profit. Our FREE catalog gives complete details. Write for it now. Lewis Machine Tool Co. 542 Sth St. ! (j San.Francisco, Calif. WANTED MEN °. OPERATE POTATO CHIP STORES We furnish everything—help finance and locate you. No experlence needed. Yremendous profils. Sensational introductory starting plan. No house-to-house canvassing. Wonderful opportunity. Mush name for free bouk of Profit Fucts—today! LONG-EAKINS COMPANY 842-5 High Street, Springfield, Ohio 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 bust- ness. Free particulars and proofs. Write today. Ave. P Decatur, IH. 28 ) POSTMASTER Stock Clerk Auditor Stenographer U.S. Border Patrol Telephone Opr. Watchman Special Agent Customs Inspector City Mail Carrier P. O, Clerk Elevator Conductor Meat Inspector Special investigator Secret Service Opr) v Typist ) File Clerk lcolara *‘How, to Qualify for ked ‘X’, Salaries, SENT FREE. Government Position mar! locations, opportunities, etc. Age Range 15 {05 O Per Name, .ccccccecccccccesneseuees soecsers ANY PHOTO ENLARGED Size 8x 10 inches er smaller if de- sired. Sume price for full length or (H bust form, groups, landscapes, pet animals, ete.; or enlargements of any part of group picture. Safe return of orlginel photo guaranteed. 3 for$1.00 SEND NO MONEY 225 nei photo or snapshot (anysize) and within a week you will recelve your beautiful enlargement, guaranteed fadeleas. Pay postman 47c plus ostage — or send 49c with order and we pay postage. Big 6x20-inch enlargement sent C.O.D. 78c plus postage or send 80c and are pay. postage. Take advantage of this amaz- ing offer now. Send your photos today. Specify size wanted. STANDARD ART STUDIOS, 104 5. Jefferson St., Dep. 376L, Chicago AGENTS "14 A DA Everybody needs food. My plan gives you immediate op- = portunity for amazing profits. Make up to $14.00 in a ee day. Tl give you a New Ford Tudor Sedan as a bonus in addition to your cash earnings. No experience required, 250 Famous Products—all fast sellers I send everything. You don't risk a penny. Write quick for Free Facts. ALBERT MILLS 1905 Monmouth Ave., Cincinnati, Ohio No JOKE To BE DEAF Every deaf person knows thata Mr. Way made himself hear his watch tick after being deaf for twenty-five years, withhis Arti- ficial Ear Drums. He wore them day and night. They stopped his head yemez x noises. They are invisible andcomfortable,nowires or_batteries. Write for TRUE STORY. Also booklet on Deafness, ArtificialEar Drum THE WAY COMPANY 741 Hofmann Bldg. Detroit, Michigan Learn Public Speaking At home—in spare time. Many overcome *‘atage-fricht,’* gain self-confidence, and increasa their_earning power, through ability to sway othera by effective speech. Write for free booklet, How to Work Wonders With Words and requirements. NORTH AMERICAN INSTITUTE, Dept. 2056 3601 Michigan Avenue Chicago, Ilinois AT HOME You can learn by our modern and original system of instruction every part of the Watch repairing Trade at home. You can earn money While learning and prepare yourself for a well paying posilion or start in business after completing our course of instruction, Good watch repalrers are in demand and generally earn very good salaries. For pare ticulars apply to the WISCONSIN SCHOOL OF WATCH REPAIRING = 524 E. Mason St., Dept. C, Milwaukee, Wis. RAISE RABBITS FOR US 4 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 A and monthly market bulletin showing names of buyers in various parts of America who continuously buy all rabbits offered them. Allfor10 cents. OUTDOOR ENTERPRISE CO., 143 Main St., Holmes Park, Mo, HULL AUTO COMPASS Have you ever taken the wrong road and traveled many miles before discovering your mistake? This new AIRPLANE TYPE COMPASS ‘constantly tells your direction of travel. Sticks to- windshield. Base 1%” diameter. ONLY $1.95, POSTPAID, ine cluding Compensator. SATISFACTION GUARANTEED. if your dealer cannot supply you, order direct. Box 246-A WARREN, OHIO HULL MFG. CO. Thank Vou for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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GAS ENGINES For Model Airplanes—Boats An Engineering Triumph! The G. H. Q. Motor is actually one of the most AT powerful motors ever constructed! Has broken THE records for amazing performance—flies model planes up to 10 ft. wing spread. Easy to LOWEST start—just a twist of the wrist—and simple PRICE as ABC to assemble (so easy only a screw- driver is needed). Steady running (runs 27 EVER minutes on ounce of gas), Cylinder and piston lapped to within .0003, Kit Includes OFFERED! plug, coil, condenser, tank, ignitlon wire, cylinder, piston, connecting rod, timer, erankshaft, all screws, nuts, bolts, ete. Every part Is fully machined and finished. No oil, gas. batteries or propeller Ine cluded. Postpaid Yor only - - =- » Peady -to-Run G.H.Q. Motor complete with pro- J Deller bilo included en- tirely assembled on stand. Tested and run before shipment—Per- formance guarantecd—ls horsepower at 3,000 to 7,000 R.P.M. No oil, gas or batterics included. Postpaid for only $12.50. Send 3c for illustrated catalog including information on gas accessories and parts. co. G. H. Q. MODEL AIRPLANE 564-A Southern Boulevard New York, N. Y. $ CLEAN UP $ average $50.00 per day Play stores, lots, carnivals with: “The LORD’S PRAYER engraved on your penny for 5c” (Suitable for rings. bracelets io sell for 25c). Price of machine complete: $160.00. Send 10c for samples and facts to “BLUE DOT” STAMP CO., [24 E. Larned St., Detroit, Mich. -of Bargains in Army, Outdoor and Sport Goods, , Clothes, Shoes, Boots, Blank- ets, Tents, Firearms, Boy Scout Supplies, etc. Send 10c for copy to be redeemed on first order, Az ESTABLISHED 1868 LY 4813 Lester St. Richmond, Va. $50 A Many of our successful students are now making big money, Our simple methods make jt fun to learn Commercial Art, Cartooning and Designing at home, In spare time. _New low tultion rate. Write for big free book, “ART for Pleasure and Proft, today. STUDIO 209, WASHINGTON SCHOOL OF ART (115—15th ST., WASHINGTON, D. C. & command of effective English gives you added É advantages and better op- & SAS portunities: Poor English andicaps you more than you will ever realize, You can improve your English through Sherwin fi Cody’s 100c% self-correcting Invention. m If you are ever embarrassed by mistakes in grammar, spelling, punctuation, or pronunclation, this new free book “How You Can Master Good English in 15 Minutes a Day” will prove a revelation to you, Send for t now, is free. ddress SHERWIN CODY SCHOOL OF ENGLISH, eee Searle Building, Rochester, N. Y. -BRANCH :-- WANTED nang RANGI RERS On small or large scale, by old established firm to cast 5 & 10c Novelties, Ashtrays, Toy Autos, ete. No special place or experience necessary as we furnish full instructions with moulds. A rare opportunity for these times so if you are over 21 and want to devote your spare or full time to profitable work write AT ONCE for full details as we are now closing arrange- ments for 1936 supply of our goods, METAL CAST PRODUCTS CO. 1696 Boston Road, Dept.2, New York, N. Y. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing te Advertisers Kendall Clough Chlef Engineer, Clough-Brengle Co. E. E. Gramer chiet Engineers ndar Yans- agaman former Corp. Karl E. Hassel Chief Engineer, Zenith Radlo Corp. F. H. Schnell Radio Engineer, General Household Utllitles (Grunow). Dr. C. M. Blackburn Radio Engineer, P. R. Mallory & Co., Mfrs. of Radlo Apparatus. 5° Guat Radic Cneenins: ENDORSE fica -TRAINING asd RECOMMEND tto YOU CROSLEY *PHILCO STEWART-WARNER, GRUNOW STROMBERG TEN ITH 4 Others GET YOUR FREE BOOK-NOW Read about the sen- satlonal endorsement of R-T-I Training— about the exclusive features that make it so outstandingly successful—a bout R-T-I Working Out- fits and 5 Advanced Courses furnished without extra cost, Act today. Mall the coupon. There is no obligation. MAIL LEARN AT HOME FROM THESE REAL RADIO ENGINEERS Learn Radio from these men! Just see who they are! All top-noteh engineers —selected by the great Radio con- cerns they work for to supervise and direct your Training. Learn Radio the way Big Radio Firms want you to learn it—the Shop way—the prac- tical way—the real money-making way. Only the Radio & Television In- stitute can offer you this chance to learn Radio from real Radio En- gineers working right in the heart of the Radio Industry. MANY R-T-I TRAINED MEN Earn Up To$ A ) Week Get out of the rut. Fit yourself for good-pay work in Radio—the field with a future. My FREE book tells how real engineers train you quickly and inexpensively right in your own home and in your spare time. Turn Your Spare Time Into Money Many R-T-I students make $5, $10, $15, and more, 2 week in spare-time work soon after enrolling. I send you instructions which you should master quickly for doing Radio jobs commou in most communitics—plans and ideas which have helped hundreds of my “boys” pay for their R-T-I Training with spare-time earnings. Good - Pay Opportunities Everywhere Broadcasting Stations, Factories, Dealers and Di: tributors and others all use “trained” men, and up to $5000 a year. Air Craft and Short W Radio, Photo Cella, Publie Address Systems and Sound Pictures have ercated thousands of good- pay jobs. This is a big year for Radio, New dc- velopments In receivera alone, demand up-to-date trained technical men. Get the facts in my Irce ook. RAY D. SMITH,’ President Radlo & Television Instltute (R-T-1) 2130 Lawrence Ave., Dept. 36, Chicago, III. COUPON J Chicago, Ill. Without obligating me, send FREE BOOK about spare-time and full-time Radio opportunities and E RAY D. SMITH, President Radlo & Television Institute (R-T-} I 2130 Lawrence Ave., Dept 36, how I can train for them at home. NOME 5:6 5 esineis dios ROSH Oe TLE HRT TENT ER Pa eee eee eee l] i Aadress. s ssassn stnrassyrnsnnroeare rsr AChseeecee N CHES. aaie ti kaa a EA O e ka e dice a rE EE ne ee E E ee n

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Less than 20 minutes a day with these 7 big mechanical engineering books entitled “Modern Shop Prac- tice,” will prepare you for a better Job and ligger pay. Machine hands become foremen and super- intendents, helpers become experts, foremen become managers. Pays Big NOW! Any machinist, helper or factory em- loyee can benefit QUICKLY and can command more money. H Don’t misa this chance to our Opportunity qualify for promotion, don't put off for one minute this Bis Opportunity which is yours almost for the asking. Seven Big Books chockful of every known mechanical fact, told so simply and clearly that any one can understand them. Over 2600 pages, nearly 2700 illustrations cover every subject fully, including Tool Making, Paltern Making, Foundry Work, Everyt Drawing, Forging, in fact anything you peen io know, or examination. verything Sent FREE ¢ e Ks vi amination, Decide in your own home or place of business whether or not you want. to Keep them, check up on any facts you want ta. Note thelr great MONEY MAKING value, then, if you want them, pay on the easiest k of payments. Complete set of drawing instruments if you send for these books NOW. These instruments are made of the fin- est of German silver, are absolutely accurate and are packed in velvet lined leatherette pocket case. Real $10 value but free to you with these books. ee ee ee es ee ee ee ae ee a a American Technical Socicty, Dept. M-6320, Drexel at S8th St., Chicago You may send me the 7 big NEW books [or free examination. T will pay the few cents delivery charges only unle: declde to keep them in which case I will send $2.00 in ten days and $3.00 per month until the total Price of only $29.89 is paid. If I return them in 10 days I will owe you nothing. use I send now, you agree to give me a membership n the American Technical Soclety’ entitling me to Free consultation privileges with any of your experts for one year and set of drawing instruments. Name .---- Address —.— Please attach a letter slating age, occupation, employcr’s name nnd address and that of at Icast one business man as reference.

BUILD YOUR OWN FURNITURE In the 1935 edition of the Handy Man’s Manual you will find just the furniture project you are seeking. Send 50c now for your copy of this 148-page book. MODERN MECHANIX PUBL. CO., GREENWICH, CONN. Cheaper HEAT Without COAL New Invention Fits Any Stove or Range Remarkable invention burns 96% air, 4% of a cheap variety of oil obtainable everywhere. Doesaway with coal, wood, ashes, dirt and drudgery. Quick, clean, silent heat. 3 times hotter than coal, ‘and cheaper. Temperature con- trol gives any amount of heat de- sired—no more getting up on bit- ter cold, wintry mornings. Many automatic features. No gas or electricity needed. Safe as ordi- nary kitchen range. Easy to in- menard women anisd ta dems stallno damage to stove- sime onstr: . x, E wonderful Invention. This year’s ply sits in firebox of any stove gales are tremendous. Make big T2nge, or furnace. Costs just a money, Experience unnecessary. few cents a day to operate. TRY 30 DAYS AT OUR RISK Low introductory price and 30 day trial. Write for free cat- alog. AGENTS and spare time workers: Oil heat saves money this year; people buy to save! Write immediately for free burner offer that starts you in business for yourself. Act NOW! BRIGHAM OIL BURNER CO. 2923-3 Clark Ave. St. Louls, Mo.

EARN $60 A WEEK! Write for FREE Burner of- fer and protected territory

New 1936 Moctel Gi 2" LATHE Write for details on this 9 in, x 3 ft. Workshop Precision, back-geared, acrew- cutting Lathe, Made in 8 different drives, 4 bed lengths. Easy Payment Termy ar- ranged over extended period of time. Corm- Fn plete information on request. WEIGHS 310 Lbs, Crated > WRITE FOR EXGBE.MADISON ST. SOUTH BEND,IND. U.S.A.

BE A PILOT—FLY A SHIP If you are stumped at the high cost of training to qualify for a license and a good future in aviation—write immedi- ately, enclosing stamp for information on opportunities now available for Approved Training under our... APPRENTICE PLAN Mechanix Universal Aviation Service, Inc. Strathmoor Sta., Dept. A, Detroit, Mich.

ONE-MAN SAWMILL 507049 MODEL TURN TREES INTO MONEY WITH A BELSAW! Makes lumber, shine Three capacities: 10, 14 and 20 gles, lath, ties, crates, (SF) feet. Accurate set works, positive <i} dogs. Full or one-way type power feedruns on low power—many own- ers use old auto engine. Pays for itself quickly —thousands in com- mercial service, everywhere, Write for free lumber handbook and catalog of milly, supplies, tools, saw tables, and woodworking equipment, BELSAW MACHINERY Co. 834-D Davidson Bldg., Kansas City, Mo.

*ARTOON YOUR WAY SUCCESS! ON’T COPY - LEARN TO ORIGINATE! RAYE BURNS will teach you HOW to CREATE ORIGINAL CARTOONS at home that you can “ A

SELLI Course has 26 lessons and 600 illustrations, Send name and address for free detads, Only- s- RAYE BURNS SCHOOL, Dept. F-X, Box 2194, CLEVELAND, OHIO

EXTRA MONTHLY WITH THIS HOBART “SIMPLIFIED” ARC WELDER Start profitable business of your own, Used car motor and chassis lets you ‘Build Your Own” and save $300 to $500. 30 Days Trial—Easy “Pays-For-ltself’’ Terms FREE Valuable Book if you tell us you’re interested. 2% Hobart Bros. Co., BoxSM-96, Troy, Ohio

Make this your life-time career Wonderful, money-making opportunities, Men, women. Growing field. Become a Commercial Photographer; a News, Ad- vertising, Portrait or Motion Picture Photographer, Personal Attendance or Home Study training. 26th year, Free Booklet.

ae MA New York Institute of Photography TALLINAS io West 33 Street (Devt. 153) New York 30 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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“anYou Equal Cony Home jor’ J, eta y/ (e) ave 3Ohto 4O% on Your New Home.. 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 materials— lumber eut-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 build- ing instructions. No wonder our customers write us that we saved them 30% to 40%, compared with builder’s prices. Easy terms—@ years to pay. Handsome Big Pictures wonderful homes in colors at money- CATALOGUE saving prices, Designs to suit everyone. rite for your catalogue today. LEWIS MANUFACTURING CO. Dept. 682 Bay City, Michigan RCA Institutes offer an intensive course of high standard embracing all phases of Radio. Practical training with modern equipment at New York and Chicago schools, fe Also specialized courses and Home Study Courses ay under ‘‘No obligation’’ plan. Wor Illustrated Catalog on request RCA INSTITUTES, INC. nert. mm-36 75 Varick St., New York 1154 Merchandise Mart, Chicago Recognized Standard in Radio Instruction Since 1909 FISHERMEN— Are you prepared for the coming fishing season? The new Sportsmen’s Manual is just the book you need. Describes inland and sea fishing, lures, boats, camp trailers and articles on other interesting sports. Send 50c today for your copy of this 148-page book illustrated with more than 500 pictures —all in rotogravure. MODERN MECHANIX PUBL. CO., GREENWICH, CONN. you can ride a genuine Mead bi- cycle 30 days with- out “buying for keeps.” Tteturn it at our expense if not satisfied Write quick for FREE color Cata- RANGER leg, marvelous new prices, special ZLEPEYR offers. Latest streamline models. SA SAVE % buying direct from i. MEAD! Mead’s Sentinel bike only $19.95 —Tangers a few dollars more. America’s finest quallty bicycle at rock-botlom prices. $ RIDER AGENTS WANTED Ride and exhibit sample of our new Balloon-Tire RANGER. and make money. Opportunity of life- time. Special Offers on our entire lne of quality hicyeles—if you hurry! Send no money—urite.— Tires Rare One-Half on lamps, wheels, tires, equipment. Drop us a postal. Mead iri isana FREE! creat Color Cal Slog gent FREE—hurry? | an ELECTRICIY Whether your ageis 16 or 40... Don't spend yourlife never sure of a job. Make up your mind to Week—or Go Into | prepare for a real future. Now Your Own Business et us train you for positions that lead to good salaries in Electricity—NOT by correapond- ence, but by an amazing practical method right here in the preat Coyne Shops, giving you a practical training in 90 days! ting 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. Finance Your Training Mall coupon below for all details of my “pay-tuition-after-gradua- tion plan” whereby you can pay your tuition in small monthly pay- ments starting 5 months from the date you start school, and then you have 18 months to complete your payments. 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—E don’t expect you to! In 12 brief wecks, in the great shops of Coyne, we train you by this interesting modern method .., on one of the greatest outlays of electrical apparatus ever assembled for training purposes. 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 we'll give you lifetime employment service. DIESEL ENGINES, REFRIGERATION AND AIR CONDITIONING Right now we are Including additional instruction in Diesel En- gines, Electric Refrigeration and Air Conditioning without extra cost so your training will be more valuable to you in these mar- velous, rapidly expanding fields. GET MY BIG FREE BOOK! (277:):,204 great chance to get into Electricity. This school is 37 years old—Coyne training is tested. You can find out everything absolutely free. Simply mail the coupon and let us send you the big, free Coyne book with photographs ...facts...Jobs «..6alaries...oportunities. Tells you how, many earn expenses while training and how we assist oup Obligation to you. So act at H. l Bur COYNE ELECTRICAL SCHOOL once. Just mail coupon. 500 GS. PAULINA ST., Dept. 66-53, CHICAGO, ILL, SEND NOW FOR FULL DETAILS! H. C. LEWIS, President, COYNE ELECTRICAL SCHOOL 800 S, Paulina St., Dept. 66-53, Chicago, Il. Dear Mr. Lewis: Withou obligation send me catalog with facts about | “Pay- Learn to Earn A g Good Salary Every our big, free oyne Training and details of yous dtion-After-Graduation’: Plan, l Name. ccrcnccccccccceressccvcnccssnsencnsnanansnnccss { Address. cacevcccerecccseccsseveccceccccssesoee | cin. ETET eer ecererecesee nes PETT meee Mail in envelope or paste on a postcard sam. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 31

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COLD Makes CABLE of PLANE Exhaust Nic Sprank Offers $5 for Best Oddity (0 ANAL FROM AUTO GASES! MOISTURE FROM THIS COUNTRY'S y AUTOMOBILE EXHAUSTS CONDENSES AN E NEW YORK TO LOS ANGELES. Robert Rowe, Jr, New York, MM ; TOLD MAKES SMOKE CABLE OF ARDANE EXHAUST! PiLoT CAMPBELL, FLYING OVER. atat AUBERT, SASKATCHEWAN, AT 70 DEGREES BELOW ZERO LOOKED BACK AND MARU ELED AT HIS EXHAUST SMOKE FORMING A 2-MILE STRAIGHT LINE. GASES DID NOT MIX WITH THE FROZEN AIR, (Foster, Saskatoolt, Sask. A 64.000,000000 LIGHT BILLI Flow ney oes coon on rages M: Reburestep into ELECTRIC. TENN, DS ATDAN IRS aN . POWER, SUFFICIENT ENERGY IS i SANN PRODUCED BY THE SUN TO SUPPLY THE WORLD WITH 64-BILLION AN $100 WAS RETURNED TO THE. à BANK FRO FROM WHICH IT NAD BEEN SWEPT PERN De RTH OF ELECIRICTY — ise à : Aobh Civinshas, Chicara MUTE i oe Leo Raymond, Sudbury, Ont 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 Nie Sprank, Modern Mechanix Publishing Company, Fawcett Bldg., Greenwich, Cenn, Source or proof of each Oddity must be given. Sendall Oddities separately, not with other manuscripts or letters. 32 Modern Mechanix Hobbies &

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FRONTIERS of SCIENCE (A Guest Editorial) eee our own generation the wealth of the world came from below the sur- face of our globe—from the mines and waters and fertile soils. It is only in the last 30-odd years that humanity has be- gun to reach upward for new wealth— upward into the air, into the strato- sphere. Already, we have made an im- pressive beginning with aviation and L radio. ) David Sarnoff lt is only a small beginning, but one could speculate at length on the poten- tial resources that still lie untouched in ultra-short waves, in sun-energy and in the stratospheric lanes. Americans once faced the frontiers of geography. Today, we face new frontiers of science. Only about one-half the human race is,.at present, within the orbit of industrialized civilization. Untapped re- sources of science may soon bring the other half into this sphere, may create immense new producing and consuming areas and provide greater scope for growth and general world- wide enrichment than we now dare imagine. | believe that the solution of the world's eco- nomic problems will yet be found through the progress of science. i For a full, unhampered development, we must have freedom of thought, freedom of action, rewards for initiative, for work, and for achieve-. ment-—in brief, a democratic system of living and of government. David Gam PRESIDENT Radio Corporation of America Inventions, September, 1936 33

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Short-Wave Radio Beam Protects Lightship From Ramming Submarine oscillators, short-wave radio beams, fog horns, and powerful searchlights will guard this new lightship from the danger of being rammed in fog as its predecessor was. Chamberlin Plans Strato-Flight N A specially designed Lockheed airplane capable of a speed of 400 miles per hour at an altitude of 35,000 feet, Colonel Clarence Chamberlin, noted trans-Atlantic pilot, will attempt a stratosphere flight between the U. S. and England. The plane will have double walls and facilities for maintaining the same atmos- pheric conditions found at 15,000 feet. No oxygen “suit” will be needed for breathing. The three-bladed propeller of the single- motored plane will have an 11-foot diameter. Chamberlin. expects to make the flight in less than six hours. Clarence Chamberlin, noted trans-Atlantic pilot, plans a U. S. to England stratosphere flight. He will fly at 35,000 feet at a speed of 400 m.p.h. His bride helps plot the course. 34 ROTECTED by a special short-range radio beacon that will warn approaching ships of their nearness to her during a fog, a new lightship, No. 112, took her station off the Nantucket Shoals, Cape Cod, on July 1. Its predecessor was sent to the bottom when rammed by the liner Olympic through the lack of such a short-wave beam protection. The new guardian of the shoals will have many new features including a 16,000-candle- power search light that will flash warnings from her masthead. Powerful automatic fog signals will sound every fifteen seconds and a radio beacon will send out messages that will reach out 200 miles. A submarine oscil- lator will send out underwater signals that can be heard still farther. Passageways running to the deck from watertight compartments assure quick exit for the crew in event of danger. The ship carries fuel enough to last for one year. Slot Machine Yields Fishing Worms Here's how the fishing worm slot machine appears in action at Northampton, Mass. The worms come out below. ERMAN P. DOUYARD, 28-year-old barber fisherman of Northampton, Mass., is the inventor of a unique fishing ‘worm slot machine. All that fishermen have to do is to visit the rear of his shop, drop a coin in a slot and carry away a can of worms. At first Douyard gathered his own worms but pressure of business forced him to organize a staff of ten small boys to handle the produc- tion end of the business. Modern Mechanix Hobbies &

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183 SHARE $1000 IN PRIZES! Meet the prize winners! Bert Pinson, the Texan pictured in the center, is the first prize winner in the big MM Auto Identification contest. second and ERT PINSON, Lubbock, Texas, druggist, wins the $250 first prize in the $1,000 Mopern Mecuanrx HOBBIES AND INVENTIONS magazine automobile contest. He earned first place with a perfect, entry and “Slow Down Death Begins at Forty” as his slogan. He is 35 years old. Entries were received from as far away as Syria. Norman K. McWilliams, of Van Dyke, Michigan, wins second prize of $150 in cash on the merits of his entry while third prize of $100 in cash goes to Gwilym Thomas, of New York City. Winners of fourth prizes of $25 each: A. G. Wuertz, Tampa, Fla.; George W. Ronald, Jr., Minneapolis, Minn.; Clayton Protzman, De- troit, Mich.; J. L. Hutchinson, San Francisco, Cal.; and Weber English, Elgin, Ore. Inventions, September, 1936 a Norman K. McWilliams, left, was Gwilym Thomas, right, was third. Misses Grace Merrill and Lucile Methe are shown with some of entries. Fifth prize win- ners $10 each: George Smar, ad- dress omitted; Mrs. J. L. Neder- hiser, Medford, Ore.; Bernard W. Skinner, Rochester, N. Y.; Saliba Sallum, Beirut, Lebanon; Albert J. Donnell, Kansas City, Mo.; Henry B. Campbell, Buffalo, N. Y.; Dr. A. J. Simpson, St. Paul, Minn.; Neal C. Monroe, Eureka, Cal.; Ira Sitkin, Lewistown, Pa.; B. Harrison Winfield, Woodcliff, N. J. Sixth prize winners $5 each: L. J. Landers, Atlanta, Ga.; Mrs. Hazel A. Raught, Lewes, Del; Mrs. Martin D. Haney, Akron, Ohio; Mildred A. Bradley, Sheldonville, Mass.; Joe R. Heimert, Oakfield, Wis.; B. G. Zimpfer, Columbus, Ohio; Herman Henig, Bronx, New York City; T. E. Mueller, Chicago, Ill; Mar- tin Daly, Buffalo, N. Y.; Oak C. Walker, [Continued on page 125] 35

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TRAINING ARMY The mission of the West Point of the Air is to turn out young military pilots competent to undertake the duties of second lieutenant in an Air Corps tactical squadron. The or- ‘“Yafiization of the combat squadrons requires high ratio of young pilots to officers of higher grades. This ratio is maintained by ending each year from 200 to 250 pilots, trained at the Air Corps Training Center to tactical squadrons of the regular army. The graduates of West Point are officers when they enter the flying school but the other young pilots are continued on active duty as Flying Cadets during one year. If their service shows them to be competent, they are then commissioned as second lieutenants, Air Corps Reserve and given a further year of active duty. - Legislation has been Heese recently authorizing the Air Corps to have 1,300 Reserve Officers on extended active duty for LARGE percentage of each years periods of five years each. This will enable graduates of the West Point Military the selection each year of approximately 270 Academy enter the autumn class at the Air graduates of the Training Center for duty Corps Training Center, Randolph Field, with tactical squadrons. The proposed law Texas. This fact, and the further fact that provides for payment, upon discharge from the flying school is conducted along lines active duty after a minimum of three years similar to the Military Academy, has caused active duty, of a bonus of five hundred dollars. this Air Corps school to be popularly termed The West Point of the Air is organized to “The West Point of the Air.” receive new classes at the Primary Flying School every four months. Each class has four months in the “Primary Stage” and four months in the “Basic Stage” at Randolph Field. The “Air Cadets” then move over to Kelly x & te Re a a An army airman learns to fly “blind”? beneath a hood in this plane equipped with dual control. The. colore. come dorn Field for their last four front of the Administra- months at the Advanced tion center at Randolph 7 Field. This structure is Flying School, where they typical of the distinctive architecture of the vari- ous buildings at the post. are graduated as pilots. During the Primary Stage trainees receive ground in- This Air Corps photo- graph shows how the hangars and runways fook to the student fly- ing above the clouds. e & eH tH HH HK

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AIR* * * = FIGHTERS struction and flying instruction on “Primary Training Airplanes” or PTs, as they are known. In the Basic Stage the flying training is conducted in “Basic Training” or BT air- planes, larger, speedier and more maneuver- able airplanes. These provide an intermedi- ate step in piloting between the PT’s and the service types such as pursuits, bombardment, attack and observation used in the flying training at the Advanced Flying School. Since a knowledge of the equipment he is flying is essential to the student, and a con- tinuous diet of flying would make a trainee “stale,” it is convenient and advantageous to combine with the flight training, ground instruction in airplane engines, theory of flight, radio, ground gunnery, air navigation, meteorology, flight maps, airplane maintenance and other subjects. This ground instruction is con- tinued until graduation. At the Advanced Flying School it em- phasizes the tactics of each class of aviation—bombardment, pursuit, attack and observation. The student body is made up of Flying Cadets and student officers. Each new class consists of approxi- mately 150 men. The class begin- ning in October of each year usually pee Future Army airmen pictured as they arrive to start instruction at the “West Point of the Air.” If you would fly for Uncle Sam, read this notable article by the Assistant Chief of _ the Army Air Corps by explaining exacting requirements of life at Randolph Field. Student fliers form an aerial “U. S. A.” with their planes over Randolph Field in Texas. BRIGADIER GENERAL H. H. ARNOLD is composed of from 50 to 80 second lieu- tenants from the graduating class at West Point. The Flying Cadets in this class therefore are reduced to such number as to make a total for the class of approximately 150. The Flying Cadets, with the excep- tion of a few ex-enlisted men from the army, are drawn entirely from civil life. In the period of one year at the Train- ing Center the young student receives a total of 323 hours flying instruction. For the fiscal year 1935 the flying for the 37 * X*+ he Me BM MH

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tt % te Ot OF OF OF OF OF - satisfactory progress in flying. Therefore, the 38 The Flying Cadets are all young, unmarried citizens, between the ages of 20 and 27, in- clusive, of good character, sound physique, and. who have had at least two years of col- lege work. If lacking the required educational credentials, they must demonstrate their proficiency by successfully passing exami- nations in United States history, English, general history, geography, higher algebra, geometry, trigonometry, and physics. The educational equation is simplified for many of these aspirants by their possession of diplomas and degrees from the country’s many colleges and universities. Professionally, these trainees are from all walks of life. Geographically, all states in the Future bombers and artillery observers receive practice on these miniature battlefields. One problem calls for the destruction of the dam. Training Center, computed in air- = plane flying time, amounted to 113,802.8 airplane hours. The flying time for the remainder of the Regu- lar Army for the same period was 312,575.4 hours, that of the National Guard 40,606.7 hours, and that of the Organized Reserves 23,204.8 hours. About 45 per cent of the students entering the Primary Flying School successfully complete the course and graduate from the Training Center. Most of the failures are due to un- This Link trainer gives pilots instruction in navigation and blind flying. It turns and pitches in answer to the stick. Cadets study bombs in lower photo. fact that a candidate has passed the rigid physical and the educational requirements does not insure his graduation. The Training Center, and The Faculty of the School of Aviation Medicine, now, as have many others during the past, are endeavoring to find out, “why can some people fly when others can- not.” Is it heredity, physical or mental make up, diet, habits of life, or perhaps our varying inherent fear of high places. Who knows but perhaps they -will find the answer some day and say with certainty, “This young man can be taught to fly but this one never will learn.” Ye)

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MINIATURE BATTLEFIE United States are represented, with oc- casional applicants from our various foreign possessions. Students from foreign countries are frequently in- cluded in the student officer classifica- tion. However, regardless of their former occupations, or their native country, all are trained alike—all live in accordance with the same rules and regulations. During the interval embraced by the dates of October 15, 1931, and March 1, Every army flier must know some- thing about aerial photography. A class is shown studying the vari- ous cameras used in map making. Both wearing para- chutes, an instruc- , tor prepares to take a student aloft for his first instruction at the “West Point of the Air.” 1935, a total of 2,022 would-be pilots have re- ported to the Air Corps Primary Flying School. During that period there were 20 foreign students who came from countries as follows: 7 from Mexico, 2 Brazil, 2 Philip- pines, 3 China, 2 Turkey, and 1 each from Germany, Guatemala, Cuba and Colombia. Of the 2,000 cadets who enrolled only five have been killed. This figure deserves es- pecial consideration as it represents the in- finitestimal percentage of less than one-half of one per cent of the total number graduated. Air Corps Photos Future airmen relax with checkers and magazines after a busy day with planes, bombs, cameras and difficult formations. When compared with similar statistics for training during the war period or with the peace time records of the schools of the armies of other nations, this small proportion is a monumental tribute to the efficiency of the Air Corps training method. What of the future of the trainee? This answer can be made: Practically all who finish at the Pri- mary Flying School graduate four months later from the Advanced Flying School and following that, the Americans are assigned to Air Corps stations for duty with tactical troops. The Flying Cadet continues in grade for an additional year for seasoning and ex- perience. This is followed by a year, or per- haps two, of active duty as a second. lieutenant in the Air Corps Reserve. Upon completion of this period he reverts to his former civilian status, but he may maintain active contact with the service through membership in the National Guard or Organized Reserves. A civilian with this wealth of flying experience behind him, is in a favorable position to seek employment with a commercial aviation com- pany. Then, too, there is the recent possibility [Continued on page 132] 39 +*+%

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Swiss Run Sihl River Through Mountain For Power Dam This dam will store the waters of the Sih! River, Switzer- land, after the water has been brought under a mountain in a tunnel two miles long which sinks to a 670 foot depth, Small Plane Hangar Easily Erected SMALL steel hangar that can be erected by two men in a few hours time has been placed upon the market. The frame is of wood and steel while the sides, doors and roof covering are made of galvanized iron. Made up of bolted construction it is an easy matter to take down the hangar in the event that the airplane owner should desire a change of location for any reason. It is claimed that the new type hangars will aid the sales of small aircraft to individual private owners by making a low monthly rental charge possible. Easily transported and capable of being assembled by two men in a few hours time, this low cost metal hanger will provide ample storage space for the average small airplane. 40 OETHE, the famous German poet, pre- dicted in the year 1797, that the course of the Sih] River, in Switzerland, would be changed, Today, 140 years later, his vision becomes a reality as engineers prepare to send the river through the mountain near Etzel to create a power plant dam. High pressure pipes in a tunnel two miles long will carry the stream. The tunnel bores 670 feet under the highest point of the moun- tain. At the tunnel’s end, a dam is being built to form the site of a lake over which a bridge is beipg placed in anticipation of the day when water will rush through the moun- tain to make the lake. Wooden Safe Passes Rigid Fire Test Exposure to fire for a period of one hour failed to damage the contents of this inexpensive safe made of ouglas fir lumber. The wooden safe is of airtight construction. WOODEN safe that will undergo fire all around it for at least one hour without harm to its contents has been constructed by Prof. T. J. Starker, of Oregon State College. It is made of two-inch thick Douglas fir lumber, is airtight, tongue grooved, and has door edges rabbeted like those found on steel safes, Modern Mechanix Hobbies &

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Super-Flying Boat Powered With Eight 800 H.P. Motors P Diesel motors of 800 horsepower each will furnish the tremendous power necessary to launch the new German super- flying boat, DO 20, now under construction at the Dornier Airplane Works at Friedrich- shafen. The new airplane, to be one of the largest of its type in the world, will have a cruising speed in excess of 200 miles per hour. No pontoons will be used to support the wings in landing, all shock being absorbed by stabi- lizing floats attached to each side of the hull. It is being built purely for commercial purposes, with extra-large passenger and freight compartments. a Student Makes Smallest Radio Tube Chao-Ying Meng, Chinese research fellow of the Rockefelier Foundation is shown with the world’s smallest radio tube which he built. It generates the worid’s shortest wave length. HE smallest radio tube ever made proved successful in producing the shortest wave length yet to be reached. The tiny tube, with a plate diameter of but 2 mm. was built by Chao-Ying Meng, Chinese research student at the California Institute of Technology. The shortest wave length generated is about one centimeter. A retarding field method is used. Inventions, September, 1936 Three views of a model of the DO 20, German super-flying boat now under construction at Friedrichshafen. It will be powered by eight 800-h. p. Diesel motors mounted in wings. | Tractor Fires Fuel Oil With Spark IESEL fuel, injected under pressure and ignited with a spark is the secret behind the economical, powerful performance of the new Allis-Chalmers general utility tractor. A Diesel pump is used in injecting the fuel oil, after gasoline has been used in starting. The new tractor has six speeds forward, ranging from 2 miles to 644 miles per hour. It develops 79 drawbar horsepower, although its weight is but 23,000 pounds. Spark ‘ignition permits a low-compression type engine, making for greater economy of op- eration. This new tractor, delivering 79 drawbar horsepower, burns Diesel fuel injected with a Diesel pump and spark ignited. It has a low compression type motor, started with gasoline. 41

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The main entrance to the Olympic Stadium, reached from the city via Adolf Hitler Place, is pictured above. Glenn Cunningham, one of America’s hopes in the events, is shown at the right. A portable German wirephoto transmitter is shown below. German Railroads Photo n Science Vies CIENCE vies with sport this summer at the Olympic Games in Berlin. The host nation is taking advantage of the ancient games to display Germany’s advances to competitors and visitors from all parts of the world. A $900,000 television system, 14 trucks carrying trans- mitting equipment to various sports centers, will bring visual broadcasts of the events to that por- tion of the 500,000 visitors unable to crowd into the array of new sports field about Berlin. It will be the first visual screening of the great open air sports event. Berlin has not only constructed the great Reich Sports Field five miles from the heart of the city but has rebuilt much of the German capital in preparation for contests in which nearly 5,000 men and women will compete under the colors of 52 nations. A 24-acre assembly field, scene of the opening ceremony, has been provided to accommodate 400,000 spectators and con- testants. At one side is the Fuehrerturm, the 200-foot Leader’s Tower, from which the Olympic bell rings. The bell, made especially for the games, is 16 feet high and weighs 10 tons. The stadium proper is only slightly smaller than that at Los Angeles and will accommodate between 100,000 and 125,000 persons. Elevators have been installed to the upper tiers. An underground radio sta- = tion will have connections with 30 stations AEP AEREE ee re an E ee Berlin’s newest television station is shown at the lower left. The film projector and picture scanner is in the rear. A new electric timing device for Olympic boxing preliminaries is shown at the right below. It tegisters the three-minute rounds, sounds the bell 10 seconds prior to the start of each round and counts the seconds when a boxer is floored. In the latter case, a mechanical speaker also gives a verbal count.

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With Sport at Olympics and networks in all parts of the world. A staff of 400 engineers has been employed. Contestants live in the Olympic Village, nine miles from the field and a city itself. A swamp was drained to provide the site. It contains a bank, a post office, and scores of one-story stone houses, each named for a German. city and containing 10 or 12 double rooms for athletes. Preparations for the field gave employment to 1,000 workers and additional thousands labored on improvements rushed to completion elsewhere in Berlin for the event. These in- cluded a new crosstown subway with a special station for the games. A special railroad station was built and the city studded with information booths. . The sports area with the auxiliary swimming stadium, open air Greek Theater and other features, occupies 225 acres on the edge of the Gruenewald at the western side of the city. Parking space is provided for 10,000 auto- mobiles in a single field. Germany leads in the number of contestants with team of 448. The United States is second with an aggre- gation of 395. Japan which hopes to hold the 1940 Games is represented by a total of 337 athletes, trainers. and officials. The team is the largest ever entered by the nation in international competition. Several new hotels have been built and many old ones rebuilt to provide 100,000 additional beds for visitors. Unlike the Los Angeles Olympic quarters of 1932, those in Berlin are of permanent construction. A general aerial view of the Olympic Stadium and fields is shown below. The 10-ton bell, pictured at top right, hangs in the tower in the foreground. _ There are tunnel entrances to the great Sports Field adjoining and to the stadium in the background. The Olympic station of the German Railroads can be seen at the right. German girl gymnasts are shown above. German Railroads Photo ee ae TEMRE. res Pe UOR

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Radio Tower Built Of Wood Improves Program Reception MERICA’S first wooden radio tower, 326 feet high, has been built for Larus and Brother, Inc., of Richmond, Va., manufac- turers of Edgeworth Tobacco and owners of station WRVA. Wood, being a non-conductor of electricity, has long been recognized as the ideal trans- mission tower material, but the number of braces and cross-braces necessary for a high tower has made such construction imprac- tical The WRVA tower, however, uses a new type of wood connector developed in Germany to eliminate most of the cumber- some cross-braces required for standard construction. These connectors consist of metal rings, saw-toothed on each edge, which are slipped between adjoining timbers to form a joint which bites into both surfaces with an iron grip. The antenna is suspended vertically be- tween the three legs of the tower, creating the effect of a single wire antenna standing erect in free space. Fading is thereby re- duced at all distances, and entirely eliminated in certain zones. The tripod style of construction, offering only three surfaces to the wind instead of four, insures greater resistance to violent storms. Each foot rests upon a 36%4-ton block of concrete imbedded nine feet below the surface of the ground. Another big factor în the use of a wood tower is the controllability of current distri- bution in the wire antenna, permitting load- ing coils and condensers to be placed at any point where they will be most effective. Changes of frequency can be made easily should such a step become necessary. There is no power loss through absorption of current as is experienced with a metal tower. Neither are there guy wires to further contribute to the loss. The result is practi- cally a circle coverage, all receiving sets in the same radius from the tower receiving the same volume. This means a reduced load for the station, as the power does not have to be stepped up to overcome losses. Dead spots in the station’s primary area are eliminated. Field test show that the new antenna has increased the area served by the station by 400 per cent, while thousands of letters from listeners attest to reception improvement. WRVA operates on a frequency of 1,110 kiloeycles. 44 Rising to a height of 326 feet this all-wood radio transmission tower of WRVA, the Edgeworth station at Richmond, Virginia, is opening a new field in broadcast effectiveness. he antenna is sus- pended between the three legs of the tower, which, being of wood, offer no interference to the broadcast. This ap- proximates the ideal in antennas—a_ single wire projected verti- cally from the ground into free space. Fading, fluctuation, carrier wave hum and other forms of interference are either eliminated entirely or greatly re- duced, according to letters received at the station from listeners. The tower, believed to be the tallest self-sup- porting structure in North America, is made of longleaf pine, Putting Machine Improves Stroke RECENT invention designed to improve a golfer’s putting ability will be placed on the market in the near future. The device consists of two track in which run three rub- ber tired wheels that support the golf club. After lining up the machine about five feet from the cup, the ball is placed on the bridge, and the golfer makes his regular putting movement. The rails serve to guide his stroke in the correct arc until it be- comes a habit. This new puttin the golfer’s stroke in the correct channel until it becomes a habit. machine guides Modern Mechanix Hobbies &

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13-Ton Army Tanks Crush Obstacles At 70 Miles Per Hour. ANKS, built like forts, equipped like battleships, and as fast as automobiles, are the latest addition to the United States Army. The steel monsters weigh 13 tons and have a top speed of 70 miles per hour when stripped of the caterpillar treads. Before being accepted by the army the tanks were subjected to rigid tests in sand pits, mud lakes, dense underbrush and steep hills. In all they proved themselves the most efficient fighting machines yet developed. Equipment consists of one 37 m.m. gun, four 30 caliber machine guns, and a radio for contacting headquarters. Quarters are fur- nished for a crew of four, with plenty of room left over for ammunition lockers and a fuel supply sufficient for a cruising radius of 200 miles. In rough going caterpillar treads are used, reducing the speed to approximately 30 miles per hour. Wind Marker Flush With Runway . Set flush with the run- ` 2 way, this neon lighted S wind indicator reduces night flying hazards. As shown on this working model, when the weather vane atop the hangar turns with the wind, contacts light up the corresponding arrow in the runway. Pilots can sight the indicator through a pea soup fog. NEON lighted wind indicator, designed to eliminate night landing hazards at air- ports, has been perfected by Albert de Weerd of Roosevelt, New York. Contact points on a remote weather vane serve to illuminate the arrows of the giant indicator according to the wind changes. The red light of the neon tubes penetrates fog, giving high visibility. Be- cause the indicator is set flush with the flying field, the tubes being protected by heavy glass, the pilot can land directly upon it, saving hazardous guess work. Inventions, September, 1936 Top—-The latest in Uncle Sam’s fighting machinery. This tank, carrying four machine guns, one 37 m.m. gun and crew of four, has a top speed of 70 m.p.h. without caterpillar treads. Below~—Plowing through a sand pit at 30 m.p.h. Model Locomotive Wins Honors N EXACT scale model of a Timkin loco- motive, built by C. F. Robbins of Keene, N. H., proved the fastest model entered in the National Steam Model Meet held recently at Oxford, Maine. Model locomotives from all over the country were entered in the meet. Even the steam plant of Robbins’ model functions as does the giant engine from which it was patterned. Soft coal is used for fuel to power the eight drive wheels. It hauled two passengers around the thousand-foot track with ease, C. F. Robbins demonstrates his scale model of a Timkin locomotive at the National Steam Model meet. His model proved to be the fastest one at the meet. It burns coal. 45

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Gar Wood and Or- lin Johnson, his mechanic, wear the smile of victory after setting a new world’s speed boat record of 110.785 s m.p.h. in 1932. Left =- Gar Wood í and his pet Great Dane, “Bjoerne.” OR a quarter of a century it has been my’ pleasure and pride to act as America’s self-appointed champion in the rivalry among nations for speed supremacy on water. I have been privileged to travel faster in an American-made boat, powered by American-built motors, than man has ever traveled on water before. Twenty-six years _ago, I set my first world speedboat record, at the dizzy pace of 30 miles per hour. Today, my Miss America X holds the world record of 124.91 statute miles per. hour. 46 ‘Harmsworth Trophy. as told to PAUL WEBER ‘When water becomes as hard as marble, and waves tip vanadium steel bolts from the hull as though they were cop- per rivets—that’s speed! America’s premier boat racer takes you into the cockpit of Miss America X and shows you what it is like in this article. Sixteen years ago at Cowes, England, Miss America brought to the United States the In itself, this small bronze plaque is worth little. But, as the historical symbol of world motorboat racing championship, it is priceless. Millions have been spent in efforts to take the trophy out of the United States. It has cost me a king’s ransom to defend it. But, thanks to luck and American engineering skill, I have been able to defend it successfully. Since the victory at Cowes, it has reposed without interrup- tion in its place of honor at the Detroit Yacht Club. It does not belong to the Yacht Club, nor to me. It belongs—for a time, at least— to America. These 26 years of experiment and struggle, have been a great adventure. I look back- ward with pleasure. But locking backward does not suffice; I am required also to look forward. Just how long I expect to be able to continue holding water speed honors in the United States is a question that I am often Modern Mechanix Hobbies &

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Wide open Gar Wood ; streaks down Creek, Filas — AmericaX on his record-breaking dash. His speed was 110.785 nautical. miles. per hour, Below—Life belt and neck brace give evidence of the hazards of high speeds in boat racing. asked. Is the practical limit of speed on water approaching? Is it possible to go on indefinitely adding miles to that mark of 124.91 M. P. H.? I should like to be able to make some satis- fying reply to these questions. But I have no idea what the “practical limit” of water speed may be, if, indeed, there is such a thing. I- feel sure that 150 M.-P. H. is well within the possibilities of boats of present basic design. How far beyond that we can go without some radical change, particularly in power plants, it is not within my power to prophesy. One thing definite is that the battle for speed honors has become a battle for more power in motors. Give me a 3,500-horse- power motor and the world will see a “new deal” in speed on water. But you could not buy such a motor in America today for its weight in government bonds. reasons why such motors are not made in this country, let us consider the two things that produce speed in a boat like the Miss America X. These two factors are power and planing ability. Boats of the Miss America type are known A 3,500-horsepower motor is not an im- possibility. However, before we gò into the Inventions, September, 1936 as hydroplanes, which means “water planes.” The hydroplane does not plow through the 47

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w r ells Ho In his father’s footsteps. Gar Wood, Jr., poses for cameramen after setting two records in Class A and C events at the National Motor Boat Sweepstakes. water like an ocean liner or a pleasure yacht. It skims over the surface when going at high speed, and the hull rides almost entirely out of the water. This “planing” is caused by the lifting power of the plane surfaces which make up the bottom of the boats hull. It is extremely important that these planing surfaces are set at the proper angle in rela- tion to each other to bring about the proper lift. On the Miss Americas we have always used only two planing surfaces. On their relative positions depends her maneuver- ability, speed and, in fact, her actual ex- istence. The sharp break in a hydroplane’s hull where the forward planing surface ends and the aft planing surface begins, is called the “step.” The forces effective on the planing surface: ahead of the step are unbelievable. The planks on the bottom of Miss America X are bolted to the hull timbers with bolts of vanadium steel, heat treated for the utmost strength. Yet we sometimes find them 48 Miss America Tenth, in the background, puils up to pass Miss England III in the Harmsworth Trophy race. Gar Wood piloted Miss America, and Kaye Don piloted Miss England. Wood won. wrenched loose, as though the water had gigantic fingers. When Sir Henry Seagrave, of heroic memory, was killed at Lake Windermere in England, in 1930, it was stated that his Miss England hit a floating log. In my opinion, what really happened, was this: Sir Henry was experimenting with the location of his “step,” to make his boat plane properly. He had not been able to figure it out mathemati- cally or from experience. So he fastened a makeshift temporary “step” on the bottom of his boat, with the idea of changing its position to suit conditions. He was wrong. It proved not strong enough. The water’s pressure tore part of the “step” out of the Miss England. The boat overturned and Sir Henry was crushed to death. He was a great sportsman and a hardy competitor. His death was a tremen- dous loss to England and the whole world of sport. Through continued experiments and the construction of the successive Miss Americas, we have assembled a treasury of information about what takes place in that small area— hardly larger than a kitchen table top— where the speeding hydroplane rests on the water. We feel that American engineers now know at least as much about this factor in building super-speed boats as any other engi- neers in the world. Although there is much still to be learned in this field, boat design has ceased, at least for the present, to be our major problem. The second factor in the make-up of a Modern Mechanix Hobbies &

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A crucial moment in the Harmsworth Trophy race of 1932. Kaye Don in Miss England has stolen the lead from Gar Wood, the “Silver Fox of Boating” and is head- ing for victory. A moment later he ran into motor trouble and Wood coasted in to an easy triumph. The race was heid at the Detroit Yacht Club. hydroplane is power. And that’s something else. The engines installed in the Miss America X are four Packard V-twelves, the most powerful gasoline motors in the United States. They are direct descendants of the famous Liberty engine. This motor was de- signed and developed by Col. Vincent, of Packard Motor Company, and Mr. Hall, of the Hall-Scott Company, and their associates, for American airplanes during the world war. Fundamentally it was as good a motor as had ever been built, and it is still practi- cally as good a motor as can be obtained in the United States today, power for weight, for marine purposes. Of course these Liberties haven’t sufficient power for super-speed boats, although they were used in the first five Miss Americas. The Packards in the Miss America X origi- nally generated 725 horsepower each. By applying superchargers and various experi- mentations, we have stepped them up to 1,900 h. p. each, This illustrates the possibility of increasing power by persistent effort, and it sounds like a tremendous lot of horsepower. But let’s see what sort of power Harmsworth challengers bring against us. When Lord Wakefield sent Kaye Don over to drive his Miss England III in 1932, the Miss England Inventions, September, 1936 Record Gar Wood is now searching for the 3500 horsepower motor, light enough for a speed boat. He is convinced that speed boat supremacy rests not in boats and men, but super-motors, carried two Rolls Royce motors capable of de- veloping nearly 2,500 h. p. each—a total of 5,000 h. p. against the 3,000 we could develop with two Packards in Miss America IX. To be sure of enough power to drive the Miss America X to victory we decided to use four motors against Don’s two, regardless of additional weight. In other words, pounds for horsepower, the British challenger was far better equipped than we were. Miss America X’s weight was approximately ten [Continued on page 135] 49

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The latest surprise in store for us comes from Austria. It is synthetic coffee, called ‘Syngala 761." Pictures show the inventor and the processed coffee cubes, 50,000 Watts In Giant Light Bulb LECTRIC light bulbs come in all shapes and sizes, but never before has there been one so big as the giant bulb now on dis- play at the California-Pacific International Exposition in San Diego. It is the world’s largest and weighs 70 pounds. But soon it will be removed and put on the job for which it was made—airport flood lighting. The bulb has a capacity of 50,000 watts and will burn steadily for 120 hours. It required a month to make and cost $600. Miss June Bishop is holding the world’s largest electric light bulb in her fap. This is the six-hundred-dollar, 50,000 watt bulb which is to later light one of our airports. 50 Austrian Chemist Makes Synthetic Coffee HE accidental triumph of an Austrian bio-chemist, Magister S. Rosenzweig, has resulted in synthetic coffee. Last summer the fruit produced by the grafted bushes on Rosenzweig’s Viennese farm was found to have the aroma and taste of Brazilian coffee, and an additional nutritive value, hitherto unknown in the tropical coffee plant. The bio-chemist calls it “Syngala 761.” Its base consists of dried fruits, seeds and roots. The dried extract is mixed with sugar and compressed into cubes, each cube making a cup of coffee. The cube is porous and easily crushed by the spoon. When hot water or milk is added, the powder dissolves without a trace of sediment. The caffeine content is controlled to the wanted amount. Pointing like a rifle and having triggers, ‘this portable light throws colored beams for signaling purposes at Logan Field, Baltimore, Md, It replaces the old flagging system. Three Colors Form Airport Light HEN the spring floods came to Logan Field, Baltimore, Md., a portable traffic light was substituted for the old-fashioned flagging system. The light worked so well that it has been kept in continuous use ever since. It is operated by revolver-like triggers, and the operator can snap on a powerful red, green or white beam. The red and green beams keep airplanes in the air until the field is cleared, the white beam signals “clear.” Modern Mechanix Hobbies &

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Trocadero Falls To Make Way For 1937 Exposition UNDREDS of buildings, many of them ancient landmarks, are being torn down in the heart of Paris to make way for the 150-acre International Exhibition of Art and Technique to open during 1937. : Among the first to fall was the famous Trocadero, built for the exhibition of 1878, and since used as a museum. In planning this vast exhibition for the world’s public, the French were inspired by the example of Chicago, Cleveland and Dallas. Aviation, the radio, television, movies, the victory over space and time, the harmonies of light and sound, the unity of matter and the movement of waves—all these wonders will be on display in the French capital next year. Blood-Making Bottle Newest Robot Dr. Edwin E. Osgood (right) 1 and, his co- inventor, Alfred N. Muscovitz, with “blood-maki ing’ ’ bottle in their laboratory at the University of Oregon Medical School, Bugene, Oregon. F INTENSE interest to the medical world is the new synthetic-life apparatus in- vented by Drs. Edwin C. Osgood and Alfred N. Muscovitz of the University of Oregon Medical School. This device is a robot bottle in which one of life’s most vital processes, the replenish- ing of the blood-cell supply by the bone mar- row, may be reproduced artificially and viewed for the first time. The bottle will be used in testing serious blood diseases. With this “blood-making” bottle and the Lindbergh “life-chamber” working for bio- logical science, who knows but that we may soon have a complete glass robot, in which all the extirpated organs from the human body will live and function under observation. Inventions, September, 1936 The sum of the scientific knowledge of today is the aim of the 1937 Paris Exposition, where Science is to be on display. Above—Model of coming exposition and the first excavation. Speedometer For Train Passengers HE Boston and Maine Railroad recently installed a speedometer in the solarium of its crack, streamlined Flying Yankee, so that passengers might check their estimates against the actual speed of the train. If the passengers like the device, the B. & M. will in- stall one in each of their de luxe day coaches on express trains. The speedometer was de- veloped by the Waltham Watch Company. If the speedometer on one of the Boston & Maine Railroad's crack flyers works out satisfactorily and interests Passengers, the company will install them on all their express traine. 51

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hirling Funnels The author, who for years has made a hobby of tornadoes and their vagaries, is shown broadcasting a weather report in Topeka, where he is U. S. meteorologist. TORNADO is the most violent type ot storm known to inland America. Except in daytime in the open country, tornadoes come without warning—a terrific roar, com- monly described as resembling “a thousand freight trains,” often a weird whistling sound, and the crash of wreckage, and the storm moves on, leaving a trail of desolation and often death that seems incredible considering that the passage of the storm requires only a few seconds. In the 20 years ending with 1935, Weather Bureau reports list 2,702 tornadoes, with a death list of 5,258 and a property loss in excess of $225,000,000. The greater number of these storms occurred in the mid-western and southern states, though very few parts. of the country have escaped. In the open country of the plains states, tornadoes occurring in daylight hours can often. be seen approaching, sometimes a quarter of an hour before they strike. There is a swift exodus of families into basements or storm caves. Experienced persons in these sections often seem to develop a knack for recognizing “cyclone weather,” and are alert to take refuge when threatening clouds loom up. This results in many unnecessary rushes to basements and caves, but it saves 52 by S.D. FLORA -Here’s the How and Why of ae Death Dealing Tornadoes By One of the Foremost. Midwest _ Meteorologists. Terror is the natural reaction when a storm of this kind appears. This tornado swept through the northern suburbs of Wichita, Kansas, on February 24, 1935, injuring six persons and causing $10,000 dam- age. Two miles farther south, a great disaster would have resulted. human life when a tornado really strikes. In large cities, with vision cut off by buildings and the warning roar of the storm muffled by city noises, there is seldom any notice of a tornado until buildings begin to crumble. Life then becomes a matter of chance. A tornado, still miscalled a cyclone in spite of the educational efforts of the Weather Bureau, is caused under certain conditions by abnormally warm, moist air being over- run by colder air. The warm air, being lighter, is forced up through the colder, much as a cork is forced-up in water, and its move- ment is governed by the same law of moving - liquids that sets up the whirl in a draining bath tub, except that in the case of the tor- nado the movement is upwards. The usual description by persons who have seen the start of a tornado is: “Two clouds Modern Mechanix Hobbies &

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Spread D rence This splinter was driven deeply into the post during a small tornado ih the suburbs of Topeka on June 3, 1927. E. C. Corkill, Weather Bu- reau official, is examining the splinter, which could- not be removed without breaking. seemed to come together.” A violent whirl starts at the cloud level and bores its way down towards the earth’s surface. When it reaches the ground destruction begins and dust and dirt drawn up soon make the cloud a menacing black color, usually with much lightning and hail. The speed of the whirling winds in a tor- nado has never been measured, but has been estimated at 300 to 500 miles per hour. The decreased pressure inside the whirl, similar in a way to the vortex in a draining bath tub, actually causes buildings to explode when the normal atmospheric pressure inside the walls is suddenly exerted against the lowered pressure outside as the tornado passes over. Tornado clouds are generally spoken of as being funnel-shaped, but eye witnesses often ` describe them as resembling ropes dangling from the sky, as “snakes in the sky,” or more commonly as resembling an elephant’s trunk. The latter is a very apt description, as the cloud has a tendency to sway back and forth Inventions, September, 1936 Some of the damage is shown at the left after a tornado killed 203 persons and caused $6,000,000 damage in and about Gainesville, Ga., last April 6. Inhabitants of Hart- ner, Kans., dived into their caves so rapidly that the- above twister passed without fatalities on June 2, 1929. as. it moves along its path. A collection of almost 200 views of tornado clouds in the Topeka Weather Bureau, probably the largest collection of its kind in the world, shows some that are inclined from the vertical until they are almost horizontal, some that seem to be . bent into right angles, some that are larger at the bottom than. at the top, and some that are huge vertical columns. Tornadoes travel along their paths at what in these days is considered a moderate rate of speed—usually 30 to 40 miles per hour, and seldom more than 60 miles per hour. They can readily be out-run by a person in an automobile with an open road ahead. It is even possible to avoid them on foot, if they are seen in time, by running at right angles to their path, preferably towards the north 53

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2702 Tornadoes Recorded in 20 Years or northwest, if a person is directly in line with their advance. Straws are found driven into trees, timbers are driven through other timbers or trees, chickens are often stripped of their feathers, sometimes without serious damage otherwise, and miraculous escapes are reported along with a grewsome list of casualties. In the Gainesville, Ga., tornado of last April 6, an automobile was thrown into a hole left by an uprooted tree. A tree was snapped off and then rammed down into the ground a short distance away and left standing upright. One house was lifted up eight feet, according to an occupant, let down again, then picked up and turned over. A freight car was found on its side, with the heavy wheels and truck nowhere in sight. A large hog was picked up somewhere in the suburbs. and set down 54 These are the ruins of the Trinity Episcopal Church at Yazoo City, Miss., after the torna- do of April 30, 1933. There was loss of life and property damage in many parts of the South on that date. A wooden splinter driven through a plate glass window at the Santa Fe store house in Wellington, Kans., during a tornado Nov. 18, 1934, is shown in>the circle. The photograph above was made 75 miles southwest of Winnipeg, Canada, on May 23, 1933. Tornadoes have occurred in western Canada as well as almost every part of the United States. on a public square without being injured. In a Louisiana tornado a few years ago a rooster was carried several miles and set down in another flock of chickens. In the Great Bend, Kansas, tornado of November 10, 1915 an unmailed letter was carried 85 miles to the northeast; and empty flour sacks from a wrecked mill were scattered over an area miles distant from the storm. In an- other Kansas tornado a herd of cattle was struck and sailed through the air like birds. In the great Murphysboro, Ill., tornado of May 18, 1925, a piece of house siding was blown entirely through a 2x6 timber, and the tongue of the siding cut a clean groove as it passed through. In a tornado at Wellington, Kansas, No- vember 18, 1934, a wood splinter was driven through a large plate glass window in the Santa Fe Store House, cutting a clean hole without cracking the glass. [Continued on page 144] Modern Mechanix Hobbies &

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Brilliant New, Comet Found By Young Garageman N THE northern skies has been found an- other comet, and credit for its discovery goes to Leslie A. Peltier, who works in a garage by day and studies the stars at night. He lives on a farm near Delphos, Ohio, where he has a home-made observatory. His 6-inch telescope was loaned him by Princeton University. To date Peltier has discovered five new comets, all of which have been named for him. As a reward for his good work, Peltier was made guest of honor by the American Association of Variable Star Ob- servers at Harvard University and received the first merit award ever conferred by them. New Metal Turns Glass Like Wood These pictures were recent taken at the ew Material” ex- hibit at the Deutsches Museum in Munich. The smaller picture shows the new widia tipped bori ng tool drilling holes in glass discs immersed in oil, The larger picture shows the tool turning a glass roll on a lathe. AID to be as hard as diamonds, widia, a new metal invented and developed in Germany, is used to make machine tools for working glass, porcelain and other of the heavy combinations known as “carbides.” Tools made with widia are used in ordinary machines and will work glass in every way that woodworking will work wood, such as planing, boring, mortising, turning—straight or tapered, beveling, producing curved sur- faces, decorative designs and so forth. No matter now how hard the product, it can be accurately finished to a thousandth of an inch. Inventions, September, 1936 Above is shown the om emade observa- tory of Leslie Peltier, amateur astronomer and discoverer of five new comets. He is known as the world’s Ereateat variable star server. All of P eltier’s knowledge was gsined at home through reading and observation of the heavens. The comets he discovered were named in his honor. Lawn Sprinkler Pulls Itself Along LIMINATING the constant moving necessary to the ordinary types of lawn sprinklers, a Beverly Hills, Calif., irrigation equipment company features portable, auto- matic sprinkling machines. Wire cable is wound around a drum mounted on the machine, one end of which is attached to a stake the desired distance across the lawn, with a sliding stop threaded on the wire and tightened. The sprinkler travels across the lawn until it reaches the stop, which trips a valve and shuts off the water. The rate of travel is about forty feet an hour. Distances of 200 to 400 feet can be covered at one setting. The portable traveling lawn sprinkler is a new development in automatic irrigation. It gives square watering and even coverage, and operates successfully on 35-pounds pressure. 55

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Sal It looks easy but it really isn’t. This champion rider illustrates a riding pose which, difficult as it is in itself, is the basis for shooting balloons, juggling balls, riding backward and other antics. HRILLING, exciting, sensational—a three-word description of motorcycle ‘stunt riding. Since the introduction of night lighted stadiums, oval track motorcycle racing is growing fast in popularity and with . this breath-taking sport has come the rebirth of stunt riding. Putt Mossman, Oakland, Calif., champion stunt rider is taking its popularity around the world. He is touring with a group of riders. ' “Any person who is physically fit and can ride a motorcycle can learn to do stunts,” explains Lawrence N. Weaver, prominent California stunt rider, and a member of the California Highway Patrol. “They must, however, have a perfect sense of balance to be able to carry on with stunts after they start them or an accident will result. They must have that sixth sense which automati- cally tells them just where to put their foot or which way to sway their body. They 56 ING ona F. LELAND ELAM tells the inside story of professional stunt motorcycling—riding the bronco bikes. San Francisco’s Don Rodman, a super daredevil, claims that crashing The Wall of Death is only dangerous to those who haven’t the feel of their wheel, who are nervous and careless. must be cool and not nervous, have no fear, and be confident. “Partner stunting is the most difficult. They must have perfect confidence in each other. They must synchronize in their work. “There are no set rules for deing certain stunts. Each rider must work out his own procedure as best suited to his own build and weight. All real stunting motorcycles are lower than stock machines although a stock machine can be used for many stunts. The safest stunting speed is from 30 to 35 miles an hour. There are many different stunts and only a few that are new. There is a future in motorcycle stunt riding for the persons who can meet the requirements.” Modern Mechanix Hobbies &

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Gene and Ruth, a pair of well- known _ stunters, are shown here in action at Lin- . coln, Neb., Ruth leans back over the front wheel while her partner balances on one foot in the sad- e George Sowopoulos, famed Greek per- former, is shown below tiding a Harley-Davidson in a wall exhi- bition at Athens. MARDEN One of the most thrilling of motorcycle stunts is wall crashing, says Weaver. At night it is exceptionally spectacular. The req- uisites for this stunt are steady nerves, a sturdy and speedy machine. The wall is six feet square. It is con- structed of boards 34-inch thick and six inches wide, nailed on a frame of 2x4 foot boards with 4x4 foot posts at each side. The rider always picks the wall boards as they must be soft, fir being used mostly, free of knots, and straight of grain. A piece of mosquito netting is tacked loosely on the side from which the crash is to be made. Excelsior is placed between the wall and netting. Coal oil is poured over it. Just before the rider starts on his 70-mile- an-hour ride the material is set afire. When Inventions, September, 1936 Could you climb a ladder atop of a driverless motorcycle spinning along at a steady pace, as shown in the thrilling picture above? The stunt rider does it by climbing the ladder backwards, crossing the top; then descending the other side. If there is any wind whatsoever, a bad spill is the inevitable result. But it’s an indoor stunt. the wall is crashed the rider passes not only through a wall of wood but a wall of flame. Metal hand guards and a metal helmet are the only protective measures taken by the rider. A horseshoe shaped frame of steel extending from the front wheel forks over the handlebars and down to the other side of the wheel is used sometimes instead of the plates on the handlebars. It is necessary for a rider to take many positions on the cycle and he must have a feeling for the proper position for his feet so as to get the correct balance. Among these stunts are ones in which the rider stands on the seat. While this is no easy trick, it is made difficult by shooting balloons, playing a drum, juggling balls, and riding backward. [Continued on page 127] 57

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Bacteria-Killing Tube Sterilizes Air Upper Left photo shows how new tubes in an adjustable lamp are sus- pended over the operating table. Plane Builder Wins Collier Trophy ONALD WILLS DOUGLAS, airplane designer and manufacturer of the famous Douglas Sleeper Planes was awarded the 1936 Collier Trophy for the year’s outstand- ing contribution to aviation. The award was based on the performance of the DC-2 a 14- passenger, twin engined all-metal monoplane with a speed of 185 m.p.h, The 1936 Collier Trophy was won by Donald Dougtas. He is shown receiving award from President Roosevelt. C. Horner, president of the National Aeronautic Association, is at left. 58 P N r photo—Dr. Beryl Hart, chief surgeon, and his assistants at Duke Hospital, Durham, N. C., wear hoods and goggles to protect themselves when working under the new tube rays. of the new rays, working with the tubes that release a barrage of radiant energy Circle—-Dr, Robert F. James, co-developer that destroys germs in the air. HROUGH the magic of a gas filled tube that emits invisible germicidal rays when an electric current is passed through it, scien- tists hope to save us billions of dollars on our annual meat and bread bill. Dr. Robert F. James and Dr. Harvey C. Rentschler developed the tube in the research laboratories of the Westinghouse Lamp Co., after years of experimenting. The tube con- sists of a slender glass tube containing a special gas. When electricity passes through the gas it emits rays that will kill the micro- organisms associated with food spoilage in packing plants and warehouses. Aside from its commercial possibilities, the new ray is being used in the medical field as the energy rays emitted by the new tube have been found to kill air-borne bacteria in a few seconds thereby offering a solution to the long baffling problem of contaminated air in hos- pital rooms. In operating rooms it has been found that the new ray will effectively pro- tect the operator and assistants from con- tamination and minimize danger for the patient. Tests have shown that post-operative fevers of patients who were operated upon under the radiations of the new tube have been markedly lower and their convalescence more rapid. A transformer using less power than is consumed by a 25-watt lamp will operate tubes. Modern Mechanix Hobbies &

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Caterpillar Hordes Invade Forests And Homes RAWLING in massed millions over an area of 8,000 square miles in Northern Ontario, tent caterpillars have stripped forests of foliage, stopped trains and destroyed crops. The squirming scourge has even invaded schools, homes and stores in its relentless advance. Dr. F. C. Craighead, of the bureau of ento- mology and plant quarantine, U. S. Depart- ment of Agriculture says that the caterpillars are to be less feared in this country than the plague of grasshoppers which has become a serious menace in Oklahoma, Kansas, Mon- tana, and a few counties in northwestern IIli- nois. Lack of funds with which to secure poison bran bait, the standard means of grasshopper combat, has hampered many states in their war on the pests. Compass Shows Change Of Course EA This new type of tele-magnetic compass which is electrically operated permits the yachtsman to control the course of his ship by remote control from points aboard ship. TELE-MAGNETIC compass that regis- i ters immediately when a craft has left its course has been invented by F. W. West, a young yachtsman. The new type compass enables the helmsman to ignore his regular compass once the course has been set. Power for the instrument is derived from a battery or a small generator. Inventions, September, 1936 Top-—This Ontario school girl is trying to sweep away the crawling pests that have invaded her school building. Below—-Ontario’s forests have been left almost leafless. Rubberized Fabric Covers Balloons NEW synthetic rubberized fabric will increase the life of balloons when used in place of the regular rubber covering. Re- cent tests indicated that the new fabric, known as DuPrene and developed in the laboratories of the Du Pont Co., has a greater tensile strength and is less affected by weather conditions. A recheck of the permeation of the hydro- gen supply of the test balloon indicated superior results when using the new fabric. Du Prene proofed fabric retained its normal physical properties and characteristics after six months of weather exposure. 16,000 feet of DuPrene fabric 36 inches wide was used in the construction of this new C-3 type Army balloon. The new synthetic rubber covering has all cemented seams. 59

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Auto Triumphs Feature Part of the imposing $2,250,000 Ford show is shown in upper left. Gen- eral Motors has a $950,- 000 display in the above building. Mi Three marionettes of the Sue Hastings troupe ride in a train made of Chrys- ler parts displayed at Dallas. Frances Nalle, 21, red- haired Dallas beauty, is official “Bluebonnet Girl” at the Exposition. A robot made of auto parts draws .a crowd at the left.

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exas Centennial Show Decked with the traditional Lone Star flags, this Court of Honor is one of the principal features of the $25,000,000 Texas Centennial celebration at Dallas. The Hall of Petroleum appears in the background. night view of the Esplanade is shown in the star with = searchlights illuminating the scene in the Hollywood manner. XHIBITS showing automobile advances in speed and safety are almost half of the dollar value of the $25,000,000 Texas Centennial display now attracting visitors by the thousands to Dallas, Texas. Largest exhibitor at the celebration mark- ing the 100th anniversary of Texas freedom is Ford with a $2,250,000 display. General Motors has a building and display valued at $950,000. Chrysler is present with a $500,000 exhibit. The event continues through Nov. 29. The Ford show includes 15 major exhibits in the air-conditioned Ford Exposition build- ing. A replica of the company’s by-products plant, complete to railroad sidings, attracts model railroad enthusiasts. There is a service exhibit showing the development of auto service from the blacksmith days to the present. ‘All of the exhibits show methods of testing materials and means of assembling. A me- chanical man made from auto parts is a feature of the Chrysler show. He not only turns his head and lifts his arm but he can hear and speak as well. [Continued on page 126] Pretty Jane Collins is one of the ‘Rangerettes” adding beauty and color to the show. Below, a replica of the Ford by-products plant, complete to railroad sidings, attracts scores of visitors.

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i f] OF SCIENCE Traffic officers in Yugoslavia punish speed- ers by deflating their tires. Free air pumps are few and far between, creat- ing an embar- rassing situation. It works. — S. L. Harmon, Doyles- town, Pa. The cost of building the average railroad is so great that the money, in dollar bills, would cover its length and width—Fred Raymond, Garson Mine, Ont. To aid the olive industry in Tunis the government has decreed that all automobile lubricating oil used in the country must con- tain 20% olive oil—Walter Hagen, Britton, So. Dakota. It would cost nearly $3,000,000 to make a complete collection of the major stamps of the world—M. Mulford, Buffalo, N. Y. A clock that didn’t run was one of Edison’s most valuable inventions. The dummy clock, located in his Ft. Myers, Fla., laboratory, re- minded workers that time was measured in results, not minutes.——John Frank Dopak, Jr., Chicago, Ill. The winter of 1936 was so severe that fifty years from now it will still be the subject for comment according to leading forecasters.— Frank Harris, Portal, North Dakota. More than $150,000,000 was expended by autoists last year in replacing worn parts on their cars.—John H. Gulick, Cleveland, Ohio. The poles used by one telephone system are the equivalent of a solid fence 30 feet high reach- ing from San Francisco to New York. — Morris Hall, White Plains, N. Y. 62 The piston of a locomotive is al- ways advancing. It returns only in relation to the engine’s frame. — Rudolf Trimmel, Wien, Austria. The human body carries enough electricity in its red corpuscles to keep a 25-watt lamp burning for 5 minutes——Ralph Sullivan, Boston, Mass. Flat cars, though lighter than box cars, are the hardest for the locomotive to pull, having greater inertia—M. N. Crowe, Souris, Man. A phosphorescent automobile enamel re- cently demonstrated in Paris makes it pos- sible to see vehicles a half mile away with the headlights turned off.—Mrs. Nella Can- field, Estherville, Iowa. Although temperatures on the moon vary from 250 degrees below to 200 degrees above zero, F., one inch below the surface the tem- perature is a constant 32 degrees.—M. Gold, Philadelphia, Pa. Particles of dye must be one seven-mil- lionth of an inch in diameter to satisfactorily penetrate the pores of cotton—B. Miller, Minneapolis, Minn. A space ship could travel to the moon in 34 hours by standing still. The moon, swing- ing on her orbit, would overtake it—H. L. Kidder, Rock Springs, Wyo. Special bull shoes of two pieces are being used on Nevada range bulls to prevent sore, stone bruised feet._F. S. Rey- nolds, Fort Mor- gan, Colorado. One dollar will be paid on publication for every Paragraph Oddity accepted. State source or proof. Do not include Oddities with contributions or letters for other departinents, No items will be returned. Address “Oddities,” Modern pelle Publishing Co., Fawcett Building, Greenwich, Onn, Modern Mechanix Hobbies &

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New Stratosphere Rocket Claims 200-Mile Ceiling ROCKET designed for flights into the stratosphere carrying scientific instru- ments which will record temperature, cosmic radiations, and general stratospheric condi- tions. has been invented by Maurice Poirier, of Burbank, California. It will weigh 175 pounds and, for the protection of persons below, will explode when its maximum height has been reached. A small parachute will enable the scientific instruments to reach the earth safely. The builder asserts that the rocket will be capable of reaching a height of over 200 miles above the earth’s surface and will be able to attain a speed of more than 25 miles per minute. The power is generated by the mix- ing of two gases known only to the inventor. No date has been set for the flight. Eighty-one years of continuous service without an acci- dent or loss of a day’s work is the world’s record of 98. year-old John M. Horan. He is a boiter washer inspector. N UNUSUAL record of 81 years of con- tinuous service with the Milwaukee Road is held by “Johnny” Hogan, 98-year- old veteran. He is a boiler washer inspector and developed the idea of using soda ash in the treatment of water in locomotive boilers. A staunch supporter of the Safety First movement, Horan has never had an accident nor missed a day’s work. Residing in Mil- waukee, he still puts in a good day’s work. Inventions, September, 1936 Serves Same Railroad 81 Years. Flashing through the stratosphere at 25 miles per second, this rocket is expected to reach a 200 mile height. It will carry aloft instrumenta that will descend via a parachute after the rocket has exploded harmlessly in mid-air. Silos Become Observation Towers WIN silos that once stored feed for live stock of a dairy farm have been converted into observation towers at a summer camp near Peekskill, N. Y. Some farmers there have found it more profitable to cater to the tourists than to undertake the tilling of the soil. The observation platforms on the silo roofs have proved very popular. Observation towers and porches, as well as cool rooms, are features of these two renovated silos. 63 farm-yard

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GREAT satisfaction to the bass fisher- man is a tackle outfit that will give him the maximum in enjoyment in handling, but which will, at the same time, touch the peak in effectiveness: The right rod, the right line and the right lure for the occasion. That bass may be taken at times on very crude tackle goes without the saying, but it is not all of fishing just to fish. Fishermen are rapidly getting in the habit of using both a bait casting rod and the fly casting rod in their fishing, having come to a realization of the fact that where the one will not avail itself, there the other one may prove unusually effective. To be efficient in both departments is, therefore, to a decided good effect and gives one the unusual oppor- tunity of testing out both methods of fishing where the situation calls for one or the other lure and manner of delivery. Obviously the fly rod has no place in the midst of the pads and other vegetation when the bass are in such locations. Here the bait rod, with vari- ous weedless pork-rind and wire-guarded lures, will prove effective. But where unob- structed water is to be met with, around rocks, sunken trees, stumps, ete., there the fiy-rod will do wonders, and may produce bass when the bait rod will be found wanting. Drop a fly in combination with a spinner oh 64 Se = PICS SPORTSMEN'S a | b = S &e FOR THE BEST by ROBERT PAGE LINCOLN a shaft in these last-named locations, and it is a wise bass indeed that does not make a dash at it with deadly effect. The bass fisherman, therefore, who carries with him both the fly-rod and the bait-rod . has at his command two deadly weapons, for which any bass water affords an opening. It is because the bait rod and fly rod can thus work together so effectively that the fisher- man should possess and should become pro- ficient in the use of both rod types and their methods. Bait casting for bass is, without doubt, more commonly practiced throughout the country than any other manner of taking bass. The first bait rods that were put forth in this country were rather long, ranging in length up to eight feet. From this extreme No bass fisherman can resist the lily pads. Here lurk the big large mouth, waiting to be tempted by a pork-rind lure or any other weedless baits. ` This lake is typical. The small mouth bass is one of the gamest fish in fresh water. This catch represents a day of thrills for three men. Either bait rod. or fly rod lures can be used against this battler, depending upon type of water.

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length they went to the other extreme and dropped down to as short as 3, 3% and 4 feet. In more recent years this rod length ‘was - stepped up to the extent that 5 and 5%4-foot rods are now considered standard for length, although 4% and 6-foot rods are to be had, the latter especially fitted for the casting of very light lures. Í It is obvious in the selection. of a bait cast- ing rod in bamboo that it should be picked according ‘to the weight of bait that is to be used. There are light, medium, heavy and extra heavy bamboo rods. That fishermen attempt casting heavy lures with a too-light bamboo rod accounts for breakages every season, It is obvious so far as bamboo rods are concerned that they should be definitely picked according to the work they are sup- posed to do. To treat a bamboo rod other- wise is sheer injustice. Certain features with regard to the fittings Like trout, small mouth bass prefer fast water, although now, due to stocking, they are found in both streams and lakes. In this water, a fly rod is a big advantage. A short cast into fast water, and Robert Page Lincoln has hooked an- other one. He is playing this small mouth with a five and one-half foot steel bait rod, one of the most popular lengths. of the bamboo bait casting rod may be men- tioned. Guides are fitted with garnix linings, also agate lining, also in a stainless steel chrome plated. Agate lining is excellent, but the steel guides are now fast coming into prominence. Both agate and garnix guides will crack and break, but steel guides in- variably hold their own. The handle should be of the best grade solid cork and there should most assuredly be a forward grip, that is a grip ahead of the reel. This grip permits of a sure and com- . fortable hold on the rod. Without it one does not have the proper control over the rod. Again, there should be a finger pull under the reel seat, which the trigger finger can grasp when casting. The value of the finger-pull lies in the ease and sureness with which the rod may be handled. Those rods not fitted with finger-pulls, may have de- tachable ones slipped on. However, most bait casting rcds now are supplied. with these pulls. Bamboo rods generally come in single enamel, six strip construction. Double built rods involve the lamination of two pieces of the outer or fibrous enamel of the bamboo, and cutting V-shaped strips from the same, [Continued on page 137] 65

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Fire Alarms, Flashed By Radio, Bring Prompt Response Chief Thomas Burns, of the Bridgeport, Conn., Fire Depart. ment broadcasts the first message over the Talkalarm, a radio fire alarm system. Inset shows loud speaker in- stalled at fire station. Speed Boat Modeled After Seaplane EAPLANES skimming across the water before taking off provided German naval architects with the cue for a new type of speed boat, embodying all the features of the plane except the wings. For lightness in hull construction a cor- rosion proof alloy called ultra-aluminum is used. On a straight course the broad hull rises almost out of the water at high speeds, while on the turns rigidly braced outriggers provide stability. Engineer H. Ellinghausen of Bremen and Naval Architect Fritz Peschkes of Cologne are leading experimenters in this type of boat. New improvements are expected to increase their speed to more than 60 m.p.h. reaches a néw peak in thrills in one of these wingless seaplanes. A standard airplane motor and propeller lift the aluminum hull almost clear of the water at high speed. Speed boatin 66 HERE once a steel tire rim, struck with a heavy hammer, summoned the fire de- partment of Bridgeport, Conn., there now is employed a radio Talkalarm system, the first of its kind in the country. The Talkalarm system has a central unit about the size of a PBX telephone board. At each fire station is a reproducer. When an alarm is turned in the dispatcher summons all stations to attention with a “siren howler” installed in the central unit. There then fol- lows a verbal description of the fire’s location and equipment needed. In this way the response is speeded up and there is no pos- sibility of signal bells being misinterpreted through a miscount. Key Found To Long Range Forecasts Four more years of drought are predicted by Dr. Selby Maxwell, fore- caster of this year’s floods and dust storms. His long range predictions have proven more than 90 per cent accurate. This map, Prepared two weeks in ad- vance for May 30, 1936, proved accurate in every detail. The moon figures largely in his calculations. OMBINING three sciences, mathematics, astronomy, and meteorology, Dr. Selby Maxwell, Chicago scientist, has developed his own weather bureau, known as World Weather, Inc., specializing in long range pre- dictions. In operation over a period of. years, his predictions have proved more than 90 per cent accurate. Beyond admitting that the moon figures largely in his calculations, Dr. Maxwell will not divulge his secret. Modern Mechanix Hobbies &

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Inventor Photographs Vibrations With Light Rays BEAM of light projected through a nar- row slit upon a mirror proved to be the solution in the puzzling problem of how to photograph a vibration. George W. Jacobus was the discoverer of the new principle, which he incorporated into his latest invention, the vibrometer. The mirror is floated in a hermetically ‘sealed pool of mercury in the base of the vibrometer. Outside light passes through a narrow slit, strikes upon the mirror and is reflected through another slit to register upon moving film. The slightest vibration is picked up by the mercury, the mirror quivers in response, and the light beam traces ,the vibration upon the film. Fused Panels Replace Painted Walls Turning a stream of water on this wall surface does not harm it in any way. Constructed of porcelain panels the wall will retain its color forever. Washing restores its colot when dirty. ANELS of porcelain enamel in a variety of colors are now replacing painted wall surfaces in many homes and office buildings. The new material which may be installed by any contractor insures a wall surface that will never have to be replaced. The panels when dirty may be restored by washing. Inventions, September, 1936 George W. Jacobus is shown here with his vibrometer, or vibration photographer. As a pool of mercury in its base quivers in response to vibrations, its movements are photo- graphed from light rays reflected from a mirror on its surface. New Observatory Built In Miniature N ORDER that visitors to the Palace of Education at the California Pacific Inter- national Exposition might familiarize them- selves with the new observatory now under construction on Palomar Mountain a model of it has been placed on display. Constructed to the exact scale, the mode] shows the new observatory as it will appear when completed and the 200-inch telescope installed. The observatory, itself, will be the world’s largest. The exact replica of the Palomar Observatory now being made teady for the new 200-inch telescope is shown above in model form where it is being exhibited at the San Diego Exposition. 67

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Sensational German Paddle Plane Built On “Flapping Wing” Principle ROM Germany comes the news of another attempt to produce a plane of the rotating wing, or “paddle” variety. Unlike the well- known Dr. Rohrbach’s paddle-plane design, the latest attempt to get away from conven- tional airscrews as a means of propulsion does not depend upon the paddles as a sole means of lift as well as propulsion. Rather, it seeks to adapt the paddle principle to an otherwise normal airfoil. The inventor, Herr Engineer R. Thebie, of Chemnitz, after studying wing-flapping flight as practiced by birds, has introduced the re- sults of his observations in his airplane. The paddles project from the lower surface of the wing and, made of flexible material, fold up into the wing itself during the upper half of the revolution. The compression of air natural to a wing in flight is thus assisted. Emerging from the wing the paddles exert a downward and lifting force. As the rota- tion proceeds they exert a propulsive force. Should the propulsive effort prove insufficient for practical purposes, Herr Thebie will install an auxiliary airscrew in front to aid the plane in taking off and other situations where ex- ceptional power is needed, The novel location of ENO BEARING the pilot’s cockpit affords a striking ex- ample of divergence from accepted design. Seated thus at the tail of the plane, the pilot has a commanding view of «tructure beneath him. SECTION THROUGH WING ae NORMAL LIFT BY COMPRESSION 7, í LIFT eee PROPULSION PROGRESSIVE OPERATIONS OF PADDLES yy - RETRACTING RADIATOR EXTENDED Ka DIESEL ENGINES PLACED IN . CENTRALLY LOCATED CABIN FLEXIBLE PADDLES DRIVE PADDLES THRU GEARING ite pin i s EE PILOT'S CABIN General view of Herr Thebie’s proposed paddle plane. Driven by centrally located engines the paddles fold into the concave under surface of the wing as shown in small diagram. 68 Modern Mechanix Hobbies &

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Giant Crane To Swing Ponderous Transformers Into Power House ATISFACTORY tests have been com- pleted on the giant crane that is to lift the 185-ton transformers into the Munici- pal Power Bureau station on Central Avenue, Los Angeles. This station is the terminus of the 266-mile transmission line from the Colorado River, and the transformers will lower the voltage of the Hoover Dam power. The crane is the largest Gantry type in California. It is mounted on steel wheels and travels a track 172 feet in length. Its big hooks have the unusual lift of 40 feet. The unusually heavy equipment and special machinery being installed in this up- to-the-minute power station is the largest ever used, which made necessary the de- signing and building of this great crane. Modernistic Birdhouses Win Prizes Each of the birdhouses shown represents a different bird classification, In the foreground is a bird bath, while the house showing construction was the largest in the contest. ODERNISTIC and rustic types marked a recent birdhouse contest of the Buffalo Evening News. Class winners included Geo. Fadale, Chester Malachowski, Sherwood Petersdorf, Harry Polarski, C. Gorsky, James Cary, Montrose Hartwick, Daniel Wiertel, Wm. Elsaesser, Fred Vogel and Billie Hughes. Inventions, September, 1936 This great crane was put to a severe test by lifting two enormous power transformers weighted with steel mgots. The crane will be used for heavy lifting in a new electric station. Big Guns Ride To Maneuvers By Rail ARLY in June, with rails and wheels groaning beneath the weight of 500-ton units, the 14-inch “Big Bertha” Army guns rolled away from their stationary bases at Fort Arthur, near San Pedro, California. They were bound for a coast point near Oceanside, over a hundred miles away. Later in the month these great guns were fired for the first time in eight years, for they took part in artillery maneuvers and repelled an imaginary enemy twenty-five miles out to sea. This is the maximum range of the 14- inch gun. Where the coastline isn’t fortified, concrete bases lie ready to receive the guns in an emergency. Moved by rail from San Fort Arthur io Oceanside, Calif., these ponderous Army guns were fired for the first time since 1928. when they took part in re- cent coast maneuvers. 69

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A miracle home, swiftly made and erected by modern Science, is the pre-fabricated house, Industry’s most-needed invention for home seekers. Presto! fac- tory-made panels be- come dream castles. Truly, these pages re- flect the creative spirit of America’s progress. by DONALD G. COOLEY nea howe ponove featured aby the bath. kitch d cent EEE SN 86 NIVE me a living room, bath, kitchen an a about $3,600. There ass orher two bedrooms. Wrap them up and de- views of the house on this page liver them in time to assemble my home for occupancy the first of the month.” The scene is the display room of a pre- fabricated house manufacturer, and the speaker is Mr. Average Man out shopping for a new home. He has just made his choice of rooms from a wide variety displayed on the demonstration floor. The manufacturer will deliver the pre-fabricated units from his warehouse—wrapped in a cellophane At the factory (see picture over the one just above) the hip roof is arc-welded into four portable sections and shipped by rail or truck. This type of roof gets away from average "box type” house, heretofore so objectionable to builders. Above—-The roof portions are lifted from the truck and assembled on top of the house. Circle—Note the artistic layout of the interior of the house and how the living room merges into the dining room without the use of doors. It is a model of simplicity, even to the placing of the glass- topped steel furniture, the mirror and also, the drapes. Modern Mechanix Hobbies &

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iL l| fist Above is a late model by the E. F. Hodgson Co., of Dover, Mass. They have been building pre-fabri- cated homes for 25 years. HOUSE ARRIVES package, if he has a flair for the dramatic— and in a week or two the proud new home owner will be able to step into a marvelously efficient house whose cost is well within the limits of a modest income. It all sounds like one of those intriguing visions of the future which nobody really ex- pects to come true, but the startling fact is that the day of the packaged house is almost here. A survey reveals some two dozen com- ronan lal PORCH __ This little dream house in the piries for, and is another artistic model by Hodgson. f yours | [Fem HEATER | "| i CL HALL LIVING ROOM Tero x nee A BED ROOM Panou i il panies actively engaged in developing and marketing such houses. A pre-fabricated. house is built up of wall ` panels turned out in quantity in factories with high-speed machinery. Panels come with doors and windows fitted into them; even plumbing pipes and electrice outlets can be built in at the factory. The plumber, elec- trician, and plasterer are to a large extent eliminated. What will the pre-fabricated house look is what many yearn The owner of an unencumbered lot valued at $1,000 can erect a pre-fabricated house with a cash payment as low as $375, with the remainder at an average rate of $23.53, including fire insurance and taxes. Inventions, September, 1936 71

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Circle—The house built of copper is rather expensive, but it has the advantage of lasting indefinitely. A blow on the house will not result in a metallic ring, as one would imagine, because insulation between copper walls absorbs the sound. like when it is unwrapped from its package? There is as yet nothing like a standardized form, and probably never will be, but in gen- eral the packaged home will be square-cut, free from gables, turrets and complicated ornaments, modernistic in general outline. Wood will give way almost completely to metal. The framework will be of steel, except where panels are used which supply their own frames. Walls will be amazingly thin and well in- sulated, with a corresponding increase in usable floor space. Costly basements will be 72 NEW PACKAGED STRUCTURES CAN The photograph illustrates how fast the factory-made house can be put together, once the foundation is laid. It shows the simplicity of setting into place a pre-cast panel of Earley Process Mosaic Concrete. Panels are anchored by a novel engineering device that créates a perfect, waterproof structure. eliminated. Heating and air-conditioning equipment operates cleanly and silently enough to be placed on the ground floor. Windows will be opened with cranks like those in automobiles. Plaster walls will dis- appear in favor of metals or processed plas- tics. The interior arrangement of rooms can even be altered after the house is assembled, for inside partitions have no part in support- ing the house. Flat roofs will be generally favored, adapted as sun decks and actually affording an additional outdoor room. And how much will it all cost? You can buy the pre-fabricated units for a two bed- room, living room, kitchen and store room house for as little as $1,050, and you can range upward to $15,000. In general, what the average man regards as an average house will cost around $4,000 from any one of sev- eral pre-fabricators. The ultimate aim is to supply homes to those family groups who cannot afford more than $2,500 for a house. The Roosevelt ad- ministration, actively attacking the pressing problem of low-cost housing, estimates that 90 per cent of our population falls within this Modern Mechanix Hobbies &

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BE ASSEMBLED ON SHORT NOTICE _ income bracket. A survey of the field shows an amazing variety of structural materials obtainable, all of them fireproof, termite- proof, rainproof, hurricane-proof, vermin- proof, and proof against so many other con- tingencies you can literally describe your house as being one hundred proof. Steel, aluminum and other metals will be widely used. Glass will become important, not only for windows but in the form of hollow bricks for translucent walls or interior partitions. The house framework will be of steel, just as in skyscrapers, except in those versions where no skeleton whatever is used. In this category fall pre-cast concrete panels, and chan- neled steel panels which themselves support the house. One company is ex- perimenting with plastics —the ma- terial out of which the caps for tooth- paste tubes are pressed—for use as structural panels, Such a house would literally come out of the chemists test tube! Already in pro- duction is the Moto- home of American Houses, Inc., of New York City. This firm turns out a wall panel made of a cement and asbestos mixture com- pressed into a slab 21⁄4 inches thick—which is the thickness of the completed wall, since in- sulation is provided by the panel itself. It is claimed that the panel never requires paint- ing and that ageing in the weather improves it until it reaches a hardness exceeding that of limestone. The panels are four feet wide and ten feet high, and come in three standard units—a blank panel, a window panel, and a door panel. These are supported by a steel frame. Spun glass is used beneath the roof for in- sulation. Cost is said to be 16% less than for the same amount of usable space in tra- ditional-type houses. National Houses, Inc., also of New York Inventions, September, 1936 General Houses, Inc., are . Pioneers in the develop- ment of the pre-fabricated steel panel and steel frame house, which are put to- gether with a socket wrench. ey have just introduced new model homes to sell from $2,500 to $5,500. These houses are built in 2-foot sections. City, uses no frame in its system of pre-fabri- cation. Sheet steel panels are used for the outer and inner walls, separated by a four- inch space which is packed with a special insulating material known as “vermiculite,” which is essentially powdered mica. Four inches of it give the insulating efficiency of a fifty-inch stone wall. The panels are simply bolted together and the exterior surface sprayed with marble dust, giving a fine-grain stucco-like finish of great durability. This design was developed by William Van Alen, architect of the Chrysler building in New York, which made history in skyscraper design by having its top 18 stories finished in stainless steel. A four-room National House with garage costs around $4,000, the garage representing $300 of this cost. This company also offers sloping roofs at the option of the [Continued on page 122] 73

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Housewives Inspire & _ Home Improvements A MIXING BOWL made of aluminum is now claiming the title of the “perfect mixing bowl.” It is light and equipped with a spe- cial handle to afford a secure grip. It has an electro-hardened finish which will not wear down of smudge the batter. Circle—A CHROMIUM NUT BONE ona 3 walnut base makes a handsome gift THIS NEW TYPE CIL-BURN- ; and a practi item. ING HEATING STOVE, de. 5 is 3 d practical household iti signed to serve as a central heating plant, needs no pipes or flues. With shutters open, it supplies radiating heat, and when closed, heat is circulated through a grille. Left—SAFETY WINDOWS which can be washed on both sides without leaning out the window are contributing to the reduction of household hazards. The sash is tilted inwards at the midrail and at top. Right—ICE BOX FLOWERS with all the characteristics of the natural blossom make nove! bouquets for parties. Their vitality is restored when placed in ice box. 74 Modern Mechanix Hobbies &

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NEEDED INVENTIONS PRIZE WINNERS SUGGEST NEW IDEAS 3 flan ORY ICE 3 REFRIGERATOR / ~ ~i WATER EXTRACTER FOR DESERT OR OCEAN Upper right—A dry ice refrigerator, operating on carbon dioxide gas, wins first prize this month as a much needed invention, Above— A means of extracting water from the air would “greatly benefit the desert country. ARBON dioxide gas, source of dry ice, could become one of the coldest, simplest, and most economical of refrigerants for do- mestic ice boxes, provided some inventor can produce an economical method of compress- ing the gas for mechanical refrigeration. The gas could be supplied in tanks, much as oxygen is supplied for welding, and released La GAS TANKS .FOR DRY ICE ` | Motorists will instantly recognize the need for a flood light located beneath the car hood. This idea wins the third prize. Mich. Mr. Dyer believes that deliquescent into the ice box as needed. For this sug- salts, such as calcium chloride, used in con- gestion A. G. Wuertz, 315 nection with a small sun- E. Lambright St., Tampa, PRIZES power boiler and an air- Fla., was awarded the first prize of $25 in the monthly Needed Inventions contest. He points out that the ad- vantages of dry ice refrig- eration would include lower temperatures, noiseless ac- tion, lack of odors, port- ability, simplicity, and low installation and operation costs. Once perfected, this inven- tion could almost name its own price. The winner of the second prize, $10 in cash, is C. J. Dyer, 311 S. Division St., Ann Arbor, Inventions, September, 1936 First Prize oer $25.00 in Cash tend 10.00 in Cash es 5.00 in Cash Second Prize .... Third Prize ..... Three Fourth Prizes 2.00 each Four Fifth Prizes.... Total—10 Prizes... 50.00 in Cash cooled condenser, could be made to extract water from the air in sufficient quanti- ties to make it a vital addi- tion to any desert expedi- tion. The salts, even in the driest countries, will extract moisture from the air. This is vaporized in the solar boiler, and con- densed for drinking purposes. As life boat equipment for ocean-going vessels, the salts would not be necessary, ordinary sea water [Continued on page 128] 1.00 each 75

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Invents Fire Nozzle; Then Designs Truck To Go With It NEW fire truck, an air compressor, jack- hammer, drilling tools and an acetylene torch, all these had to be added to the Port- land, Oregon, fire department simply because N. T. Woods, superintendent of fire apparatus, invented a fire hose nozzle. The new nozzle was highly efficient in fight- ing dock and cellar fires. It would throw 700 gallons of water a minute in all directions, up, down, and to all sides. But it required that there be a two-inch hole in the dock or floor through which it could be inserted, and with ordinary fire tools, it took too long to chop through heavy timbers, concrete or steel. Superintendent Woods went to Fire Chief Grenfell with his idea, and to- gether they de- signed a fire truck to carry the new nozzle, air com- pressor and cutting tools. A two-inch hole for the nozzle can now be cut through anything Supt. N. T. Woods, left, and Capt. Grenfell try out the pneumatic wood cutter and concrete driller, two tools necessary in boring through docks and floors. Once the from wood to steel hole is made, the special fire nozzle invented by Wood quickly quenches the fire. in a few minutes. Poland Vies For Tourist Trade With Luxury Motorliner HILE world-wide attention was being focussed on the Queen Mary, Poland j went quietly ahead with the construction of a her 16,000-ton luxury motorliner, the Batory. an ; ; Built in Trieste, Italy, in return for coal from Po Poland, the Batory is a sister ship of the i Pilsudski, Poland’s first transatlantic liner since she regained her independence. The Batory is now plying between New York, Halifax, Copenhagen and Gdynia in the Gdynia America Line service. She crosses to Copenhagen in 8 days, to Gdynia in 8% days. Woman Invents Foot Brake Catch ISS HELEN RANLETT, a graduate of Radcliffe College, is credited with being the only woman to exhibit an invention of her own at a New York Automobile Show. She is the inventor of a brake catch which will i i — hold the car stationary on a hill, leaving the Here is Poland’s new queen of the seas, the 1600-ton motor- foot free for quick starting. The catch is co- liner, the Batory. She is reported one of the finest afloat. ordinated with the foot brake 76 Modern Mechanix Hobbies &

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A Hop, Skip, And Jump Launches 90-Pound Hang-Glider HE closest approximation to free flight yet to be reached by man has been achieved by Bob Morse, 28-year-old glider pilot, of Rendondo, Cal., with his 90-pound hang-glider. No motor or launching device is necessary with his glider. Strap- ping himself into the open nose of the craft, the pilot uses leg power to build up a take-off speed of 15 miles per hour. Once in the air, the glider builds up a flying speed of from 22 to 25 miles per hour. The glider is the result of four years of experimentation on the part of the inventor, He uses no ailerons and the rudder and elevator controls are worked by cables attached to his body. He serves as his own landing gear. Life Preserver Worn Like Collar The collar life preserver demonstrated by this young lady is intended for rescue work in rough water. It keeps the vic- tim’s head above water, and makes towing an easy process. HE difficulty encountered by life guards in saving people from drowning in rough water has been greatly reduced by. the use of a new collar life preserver. The life preserver, which weighs but a few ounces, will support a person indefinitely. It is worn, ready for an emergency, across the back of the life guard. He swims to the victim, attaches the preserver about his neck, and tows him easily to shore. The collar serves to keep water out of the victim’s face, and at the same time it is impossible for him to lose his grip. In the event of a major catastrophe, such as the sinking of a boat, a life boat equipped with the collar preservers could supply the victims with the safety devices until additional help arrives. Inventions, September, 1936 Here is Bob Morse and his man-powered hang-glider. and the ship is launched. controlled by movements of the pilot’s body. A run and a jump It has a flying speed of 22 miles per hour and is No landing gear is needed. New Device Sends Color By Wire HE transmission of color over telegraph or cable lines has been accomplished after ten years of experimentation by Howard Ketcham, New York color engineer. By means of his simple, inexpensive device color in more than 300,000 shades and variations can be wired to any part of the world. A three-color card is set to whirling in the device, the colors varying according to its speed, At the other end of the line another card is synchronized with the sender, and a signal is sent when the desired color has been reached. It will be used for industrial purposes. Industrial plants with branches at distant points can now match colors perfectly by wire. Howard Ketcham is shown here with his device for sending colors by telegraph or cable. 77

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BUILDING PLANES For STUDENT FLIERS Ontario. Details of wing construction are pictured here. When the tilerons are to be attached, only a cabinet-maker of John Collingridge’s ability is permitted to drill the wings. He is shown in the above photo. When the fuselage is constructed, the engine is set into its bed. Then comes the intricate job of instrument installation, which is in the hands of Beverly Brisco and Ivor Elliott. This company makes everything but engines and instruments. 78 One of the Fleet Trainers under construction in Fort Erie, Henry Sawyer and Jack Edgeworth are seen fitting seat into assembled fuselage of plane. Buffaio Times photos. Above—Miss Ethel Johnson and Mrs. Margaret Peterson are seen at their task of covering and doping the fuselage. Super-craftsmanship, that is what counts at this plane factory. There is no high-speed produc- tion assembly line here, for Victor Wicks mach- ines every metal fitting by hand. When the parts are installed, the fit is exact and accurate, with no lost motion. Left—The finished airplane, sparkling with newness, is wheeled out of the factory and ready for flying tests and ship- ment, HE Fleet Aircraft Company of Canada, a branch of the American Consolidated Aircraft Corporation, in its factory, builds the Fleet. Trainers which are used so roughly by the pilot training instructors of fourteen nations. These planes must stand the gaff of bad landings and faulty air handling, because embryo pilots make many mistakes. With only slight changes yearly, the planes have been manufactured for a decade. Cur- rent models have hoods attached for training in blind flying. Fittings are tooled individu- ally and there is no high-speed assembly line. Modern Mechanix Hobbies &

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Attic-Raised Silk Worms Forecast $100,000,000 Industry $100,000,000 dollar industry, producing nearly a million new jobs, can be brought into the United States with the introduction of silk worm raising, John Ousta, a silk ex- pert from Turkey, believes. As further proof of his claims, he has begun the raising of silk worms in the attic of his home in The Bronx, New York. At present the United States is importing millions of dollars in raw silk. According to Mr. Ousta, American climatic conditions are more favorable to the raising of silk worm than in either Japan or Turkey. The silk worms he has raised thus far substantiate his claims and produce high quality silk. Fire Fighters Use Knapsack Radio No larger than a soda cracker box, this pack-type radio receiver is designed for emergency work such as mine rescues and fires. Weighing less than 4 lbs., it has a range of several miles. KNAPSACK radio receiver, no larger than'a soda cracker box and weighing only four pounds, has been designed for use in emergency work such as mine rescues or forest fires when every second saved may mean the difference between life and death. Using a single tube, the midget receiver has a range of several miles and is equipped with batteries for several hours of continuous re- ception. The single small ear phone causes no discomfort and allows perfect freedom of mo- tion. In attacking a forest fire, the head ranger, located at some vantage point, can use a small transmitter to direct the work. Inventions, September, 1936 Here is what may be the start of a $100,000,000 silk industry in the United States. John Ousta, Turkish silk expert, raises these silk worms in the attic of his New York home. He finds they are healthier than those raised in Japan or Turkey. New Ride Thriller Loops The Loop HRILL seekers at county and state fairs, carnivals, and other amusement resorts will this year be offered all the thrills of a test pilot and all the safety of a train ride in the new Loop-o-plane. The new ride whirls its passengers in a giant loop, keeping them all the while securely strapped to their seats. Ít is six times stronger than necessary. a Looping the loop in a Loop-o-plane, one of the latest thrill rides to make its appearance. It looks and feels daring, but it is perfectly safe, as there is nothing to get out of control. 79

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PLASTICS REVOLUTIONIZE An ancient game is now played with pieces of a new material. These chessmen are made of Catalin, one of a score of the new plastics brightening life. S THRILLING as any Polar exploration is the day-by-day chemistry in America’s laboratories. Here intrepid men with test tubes and beakers forge into the vast uncharted lands of science. More money is spent in this cease- less venture than was ever dreamed of by Byrd or Stefansson. The cost is reckoned in millions—even, as with radium, in human life—but the gains are worth the battle. For out of this pioneering comes new wonders to revolutionize industry and add comfort and enjoyment to living. The average American gets up in the morning, switches on the light, shaves, has breakfast, buttons his coat, hops into his car and is off to work. In that short morning hour, usually without realizing it, he has many times made use of a peculiar substance that not so long ago was unknown. That substance is the plastic, a brilliant new child of modern research. The electric light switch is plastic. The razor and its case are probably plastic—as are the handles on the breakfast cutlery, the buttons on the coat, the knobs on the instrument panel of the car. Bright, sturdy and useful articles are all of them—yet they were made 80 Out of Test Tubes Come Man- Made Products Smashing. Tradi- tional Fabrication Methods and Making Cheaply Available Shin- ing Articles of Surpassing Utility. The material beneath the dishes is washable Fabrikoid. The Remington knives have handles of Dupont rubber. The worker below is forcing Catalin into desired forms. Modern Mechanix Hobbies &.

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AMERICAN INDUSTRY by W. A. SWANBERG This new dinnerware is made at Hopewell, Va., with pencil line trim- mings unaffected by wear, water or acids, thanks to research. from sour milk, from the fuzz of cottonseeds, from carbolic acid or from thin air. All are recent triumphs of the laboratory. New as they are, plastics have several decades of history behind them. Celluloid, one of the first widely known plastics, is familiar to all; and Bakelite has long been indispensable in telephonic, electrice and radio construction. Yet after these had been on the market for years there sprang a new and versatile aggregation of plastics that brought new moldability and workability, new color and more uses. Though of some- what different formulae, and suited for dif- ferent uses, all have two things in common. All are plastic—capable of being molded or cast. And all go through the chemical process known as polymerization, in which the mole- cules of the substance combine by enlarge- ment of molecular structure. Inventions, September, 1936 After Dr. Leo Baekeland discovered Bake- lite almost by accident in 1909 when he was trying to make a fusible synthetic resin, the creation of new plastics slumped. For years Bakelite and Celluloid were the only im- portant ones used in America, and each had definite limitations. Celluloid, admirable as it was for many uses, was highly inflam- mable; and Bakelite, despite its utilitarian excellence, could not then come into popular use because of its cost and blackness. America needed a popular plastic—a sub- stance cheap, fire-resistant, and capable of taking on beautiful colors so that it could be used in the drawing-room as well as the tele- phone exchange. Not until the last decade did such a product appear. Beetle, Catalin, Durez, Plaskon, Tenite, Resinox, Unyte, and many others—all are new names, all trade names of brilliant plas- tics made for thousands of uses. Outwardly similar, they are chemically different. Lus- 81

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STARTLING NEW SUBSTANCES trous, vari-colored Catalin, for instance, can- not take the place of Bakelite in telephone and radio; nor can black Bakelite replace Catalin in the construction of toilet articles and chess- men, where beauty is needed and dialectricity ‘is not. Roughly, plastic can be divided into three groups: Those made from vegetables, from animal, and from mineral matter. seer These boxes are made of new plastic materials par- ticularly adaptable to the manufacture of shining table and desk articles. A scene in a Newburgh, in their quest new substances industry. This Fabrikoid table Catalin is shown at the 82 search laboratory at Chemists conduct endless, experiments shows possibilities of plastics in several phases of household use. forms available to fabricators. Cellulose—the fiber forming the cell wall of all plants, but found in its purest form in cotton—is the old and the new titan in plastics. From this cheap and plentiful vege- table base came the earlier Celluloid; and it now makes Pyralin, Tenite and cellulose acetate. Though it will burn slowly, cellulose acetate is not highly inflammable as was the older Celluloid. Buyers of Cord, Auburn and Hudson cars this year have steering wheels made of this newest plastic. Sheets of Pyralin one-fiftieth of an inch thick are sandwiched between two thin panes of glass to make modern automobile safety glass. And tough, gleaming Tenite now makes thousands of fountain pen barrels, as well as many other semi-transparent things. It seems a far cry from cow’s milk to buttons, yet chemistry has hurdled the distance, America’s button industry—a large producer concentrating on a small’ but vital product—relies largely on milk for its basic material. Casein, made from milk, is chemically combined with formaldehyde to form a lustrous plastic that is giving buttons a more prominent place in wearing apparel. Mineral plastics are composed chiefly of phenol (carbolic acid) combined with for- maldehyde. Of these the well-known Bakelite and a few others are molded into desired shapes, are black in color, and therefore are largely restricted for indus- . trial use. Others such as Catalin are made from similar basic materials but are cast ` into sheets, rods and tubes of brilliant re- for for setting right in Modern Mechanix Hobbies &

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REDUCE COSTS IN MANUFACTURING colors. This bulk stock can be fabricated by cutting or by turning on an ordinary lathe, resulting in colorful cutlery handles, knobs and novelties. Among the most useful of the phenol plastics is the laminated type, such as Formica, in which canvas or other fabric is pressed into the material for greater strength and insulation. Modern motor cars can thank laminated phenolic formaldehyde for a large degree of their quietness. Gears of this substance have widely supplanted steel because they wear remarkably and do not clatter. In the new ocean giant, Queen Mary, too, is $100,000 worth of decorative material made from fire-resistant American Formica. One of the newest compounds to startle the market is the urea plastic, a mixture of nitrogen—snatched from the air—with car- bon dioxide and formaldehyde. Unlike the others this is manufactured first as a powder and is then molded. Grocery scales made by the Toledo Scale Company used to be housed in cumbrous metal that made them weigh 160 pounds. The company substituted Plaskon, a urea plastic, for its metal housings; in so doing it reduced the weight of the scales to 55 pounds and trebled its sales! Industrial war is the inevitable result of a Playtime gadgets of Catalin are shown at the right. They are made of synthetic resin, now widely used in manufac- turing. A solution of phenol and formalde- hyde is ovencured and shaped, Inventions, September, 1936 successful new material. When one considers that many industrial units formerly made of several pieces of metal bolted together can now be molded in one piece of plastic, thus saving the cost of assembly and painting, the answer is obvious. Yet there are many uses which plastics cannot as yet fill, because of mechanical limitations. Will research remedy that by [Continued on page 130] of Catalin are The table silver-white cellophane. Toilet articles pictured at the left. cloth is made of and = sapphire-blue 83

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Mirror Delivers Sales Talk To All Who Pause Before It Anyone pausing to inspect himself before this mirror is re- warded with a sales talk delivered by automatic phonograph shown in the foreground. An electric eye starts the machine. Marooned Men Build Catamaran HEIR Chinese junk wrecked at Kalau- papa, Molokai, two French scientists, Capt. de Bischop and M. Joseph Tatibouet, immediately began construction of a new craft in which to continue their study of the South Seas. Aided by two Chinese carpenters, the pair began work on a catamaran, or “double out- rigger,” and expect to have it ready for launching in a few weeks. It will have two hulls, each 30 feet long with four feet of draft. It will be a two-masted, junk rigged sailing vessel. They plan to sail it back to France via the Panama Canal. In this catamaran two French scientists plan to sail from Hawaii to France. It will be junk rigged as shown below. 84 HE universal appeal of the mirror has long been recognized by advertising men as an effective medium for attracting atten- tion to their message but it was left to an en- terprising inventor to perfect the talking mir- ror. With his device the mirror delivers a sales talk the moment someone pauses before it. The talking mirror is intended for installa- tion in department stores, but it can be used outside with equal effectiveness. An electric relay system swings into operation the mo- ment anyone interrupts an electric eye to scan himself in the innocent appearing mir- ror. The relay starts an automatic phono- graph and amplifier and a brief sales talk is delivered. Casting Turns Out To Be Monster Like a sculptor’s nightmare appeared this giant casting when engineers knocked off the mold. The steel elephant is really the outer high-pressure shell casting of a steam turbine. NOCKING the mold from a giant casting to be used as part of a 40,000-kilowatt turbo- generator, General Electric engi- neers were startled to discover they had apparently unearthed a prehistoric monster. The excess metal had overflowed the mold, adding a vicious trunk and huge ears to the many-legged monster. After trimming and machining operations are completed, the cast- : ing will become the outer high- = pressure shell of the steam tur- bine. Modern Mechanix Hobbies &

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Astronomer Builds Fifty-Foot Transit To Survey Universe SURVEYOR’S instriiment, not for measuring rods and miles on earth but for accurately surveying millions of miles in space, has been designed by Dr. F. G. Pease for use at the Mount Wilson Observatory. With the assistance of his new instru- ment, called the interferometer, Dr. Pease determined that the star Epsilon Pegasus, 2,160,000,000,000,000 miles away, had a diam- eter 100 times as great as that of the sun. By adjusting two sliding mirrors on a 50- foot steel frame, the star’s reflection can be measured. Mathematics then supplies the actual diameter of the star. New Grappler Has Sighting Tube £ Articles iost in deep water can be quickly recovered with this hydro- scope grappler. Constructed of watertight, sectional tubing, the operator may visually examine the botom while being propelled ovet its surface. A battery oper- ated search light illuminates the area beneath the tube. UNKEN motors, fishing tackle and other articles lost overboard may be quickly recovered with a recently patented hydro- scope grappler which can easily pick up a small ring or a heavy motor. A sighting tube illuminates the bottom with light from a small battery, and the grappling hooks can be ma- nipulated from the surface as desired. Addi- tional sections provide for deep water. It was patented by Fred Arnold of Cambridge, Ohio. Inventions, September, 1936 This is the interferometer, a 50-foot transit used by astrono- mers in surveying the universe. Two sliding mirrors are focused on a star and the reading, based upon a mathematical formula, accurately determines the diameter of the star. Atom Gun Will War On Cancer CIENCE continues to marshal its forces in the war against cancer, the latest addi- tion being a new atom gun with a potential of 2,500,000 volts recently constructed at the University of Wisconsin. The great machine is expected to hurl protons at a velocity of 15,000 miles a second. Present experiments are being directed at developing super X-rays to produce an effec- tive cure for deep-seated cancer. The experiments are being conducted under the supervision of Dr. D. B. Paarkinson and Dr. R. G. Herb. Last year the two scientists attracted nation-wide attention with their work on a smaller atom gun. Dr. D. B. Paarkinson, left, and Dr. R. G. Herb of the Uni- versity of Wisconsin, shown inspecting power plant of a new atom gun expected to develop a potential of 2,500,000 volts. 85

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Astronomers Study Radio Interference Dr. Seth B. Nicholson is shown adjust- ing the auto- matic spectro- helioscope used to obtain a con- tinuous record of the sun. ie 2 The instrument shown above is the re- : matkable apparatus with which Dr. Robert S. Richardson, of Mount Wilson Observa- tory, Pasadena, Calif., discovered that when short wave radios went out of com- mission about every 54 days, it was be- cause exploding sun gases interferred. Circle — Here is Dr. Hickox experimenting with the filter device devel- oped by Dr. dison Pettit for measuring the sun’s out- put of ultra- violet. light. MPORTANT astronomical problems are being solved with recently invented scien- tific apparatus by Doctors Nicholson, Hickox and Richardson at Carnegie Institution’s Mount Wilson Observatory, near Pasadena, California. For the first time a new camera makes con- tinuous photographie records of the sun, and an intricate filter device measures its output of ultra-violet light. A new spectrohelio- scope enables astronomers to observe masses of exploding gases moving over a T7-inch image of the sun, while a magnotemeter records all variations in the intensity of the earth’s magnetic field. Scientists believe that sun spots explosions cause a periodic inter- ruption of short wave radio reception. 86 Modern Mechanix Hobbies & Astronomer Jo- seph Hickox, of Mt. Wilson, is shown here ad- justing the in- struments which automatically re- cord all the va- riations in the magnetic field.

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Radio Telephone Solves Difficult Railroad Problem HE difficulty of communication, especially in emergency situations between signal towers and engineers on trains, has long been a major problem of the railroads. When a change of orders came over the wire, nothing could be done but signal the train to stop at the nearest block. But the French railroads solved a world- wide problem by installing radio sending and receiving apparatus on the locomotives and in the signal towers. The idea was first ex- perimented with on the Rouen-Paris run, and radios were immediately adopted as standard equipment. Today, engineers and signal tower chiefs are in constant communication. Camera Shoots Inside Of Oil Well The stake-like affair held by Mies Ann Hollenburg, and ' demonstrated at the recent Tulsa, Oklahoma, Oil Exposition is the new power-driven, electric-lighted oil well camera. AMERAS go everywhere these modern times, into the air above, the waters be- neath and, now, into the very earth itself. For today there is a 4-foot, power-driven camera, carrying its own electric light and automatically taking pictures every three minutes, that follows the oil or rock drill down the hole to a 10,000-foot depth to secure photographs of the earth’s strata. Inventions, September, 1936 The ciecled photograph shows the engineer talking into and receiving orders from one instrument, but the radio itself is in a compact box on the front of the locomotive, as shown. Novel Gas Gun Is Death On Flies OMETHING of a crack shot is Dr. J. F. McClendon, of the University of Minne- sota, who will not permit flies in his class- room or laboratory. His air gun is loaded with pyrethrum con- centrate, which is four times as strong as ordinary insecticides. When a fly zooms in to put on an annoying aerial exhibition, plop! goes the good doctor’s trusty gun, and there is one less fly to fight against. Dr. J. F. McClendon, University of Minnesota, is shown demonstrating his recently invented fly-gun, which shoots a powerful chemical at flies. The poisonous vapor kills them. 87

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He Finds Music in Plumbing Tools HOSE tools that plumbers once left be- hind have been given new uses by “Red” Smith of Los Angeles. He has turned them into musical instruments. Red was a professional crooner and saxa- phone player. When work became slack in the movie studios and theaters he took up the creation and playing of unique musical in- _struments. And get work he did—as the musical plumber. He plays all the plumbing tools. Yes, sir, actually plays them, for he fashioned all the tools into musical instruments. And, to keep his act in character, he wears coveralls and Above-——By inserting a trumpet and mouth- hauls his tools around in a bathtub. Piece into the hole F , i : : whee GAC pamp To hear the strains of his musical blow- ordinarily screws in E 5 : ; Rediproducsd WEA ; ; ; torch, suction pump or water faucet, is first he calls the hot A to laugh, then marvel over his mechanical blow torch trumpet. ingenuity and unique musical cleverness. By turning.a pound coffee can upside down inside an enameled stew pan,. Red strung up an instrument to rival the real banjo. He is seen strumming the pan-can in the photograph at left. Red inserted a cornet mouthpiece into a length of shower hose (above), perforated for finger play, plugged in the nozzle ‘and found himself with a rubber clarinet. Red added a fife and so solved the problem of what to do with old hot water bottles. He calls this unusual oddity the plumber’s bagpipes. Right—W ith a water faucet and trap assem- bled to a length of per- forated brass pipe, Red pipes applause from his delighted but rather be- wildered audience. He opens and closes the faucet to the wanted degree to change tones. The plunger or “plumber’s friend” proved itself a real friend to Red, who tricked it up with a contra-bassoon reed in Key of C, then blew hot swing music out of it. And that took real ingenuity. 88 Modern Mechanix Hobbies &

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New Denmark-Sweden Bridge Spans Famous Battle Inlet O JOIN Denmark and Sweden, a great bridge is now being rushed to completion betwen Malbo and Kjobnhavn. It spans the inlet between the Baltic and the North Sea, at the spot, where, during the World War, sub- marines fought against enemy battleships. The Oresund Bridge will span eleven miles of open sea, with the central arch 150 feet above the sea, sufficiently high for the largest ocean liner to pass beneath without lowering her masts or funnels. The two navigation channels are bridged by single 1,000-foot bowstring spans. There will be levels for trains, automobiles and push cycles, of which there are millions in use on the Continent. Life-Saving, A One-Man Operation Life-saving now becomes 4 one-man operation imstead of using men as formerly, for with this new apparatus, the chest bellows, operated by handle, provides artificial respiration. MONG the many exhibits on display re- cently at the Salon Nautique, Paris, was the latest in life-saving apparatus. Where formerly it required the aid of two men to complete the job of artificial respira- tion, the new apparatus needs only one man to resuscitate the water victim. The opera- tor straps the bellows beneath the uncon- scious man’s chest, lays him face downward, adjusts the head-rest to align the windpipe, then rocks the handle of the respirator. Inventions, September, 1936 This new railroad and motor bridge spans the inlet between the Baltic and the North Sea where, during the World War, German and British submarines fought against enemy ships. Vertiplane’s Wing Locks In Place HE vertiplane, closely related to the auto- giro, and perhaps later to evolve into the long sought helicopter, is the invention of Gerard P. Herrick, cousin of the late Am- bassador Herrick. It was tested recently at Fairchild Field, N. Y. The novel upper wing of the vertiplane functions in the usual byplane manner, or spins like the vanes of an autogiro. So far take-offs have been accomplished with the fixed wing, but when altitude was reached, the wing was made to spin and hover the ship over given points. The idea behind all these experiments is to perfect the vertiplane so that it will rise and descend vertically. Called the vertiplane by its inventor, Gerard P. Hertick, this new type of aircraft ie a combination of biplane and autogiro. The novel top wing spins or remains stationary. 89

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Auto Parts Make Efficient SOLID TIP ORILL HOLE OR HOLES AND FILL AS NEEDED TO OBTAIN EXACT BALANCE WITH MELTED LEAD. BALANCE AFTER AS- SËMBLING TO HUB & MOUN TING a m ta RABBET N i" pLywooD ~^ RIBS MOUNTED Y FREE ON SPAR COPPER OR ALUM. OLD WIRE. > : a is WHEEL HUB f S LS SPLIT TUBE HERE AND DETAIL. EXPAND TO CLEAR SPINOLE of HUB j : HOLES IN STEEL SPAR PERMIT POSITION OF BLADE TO BE s . ALTERED TO CHANGE PITCH DETAIL OF BLADE CONSTRUCTION w , USE PINKED TAPE {WHERE COVERING Í SEAMS OCCUR SOLID WOOD END FORMER. RABBET AS SHOWN FOR 3~ PLY COVERING COLLAR, 1/8" PLYWOOD a TS COVERING > MACHINE BOLT PINS BLADE IN DESIRED POSITION SECTIONAL VIEW THRU COLLAR AND Bi BLADE-SPAR op hea Vogt" kaif \ SEE CROSS- SG SECTION ABOVE ò SEE DETAIL OF SPAR AT HUB VARIABLE PITCH AD- JUSTMENT HOLES ON BOTH SIDES OF HUB MUST BE SPACED EQUALLY . . STEEL OR IRON COLLAR - BOLTED TO END FORMER A SIMPLE FORM OF - DIAGRAM SHOWING RECOMMENDED PROPORTIONS The propeller blades are constructed from plywood with airplane tubing forming the rigid center core. inches apart serve as mountings for the plywood covering. VARIABLE PITCH FAN FOR WIND DRIVE POWER SPACE 9" TO (2 APART DEPENDING ON BLADE SIZE Spacers placed 9 to 12 If one side of the propeller is too heavy drill holes in the tip of the other blade and fill with melted lead. A copper or aluminum strip seals the edges of the blade and prevents chipping. by DOUGLAS P. ROLFE NE of the many problems confronting the prospective builder of a wind driven generating plant is the selection of’a suitable windmill or propeller. While the flat-bladed, fan type is usually selected by amateur builders there is a strong argument for the airplane type propeller and as a matter of fact it is becoming increasingly popular. In the first place old airplane propellers are fairly easily obtained and are not at all ex- pensive. While in certain instances an old airplane propeller may prove satisfactory there are many more cases where its value is something less than zero. Many times these propellers are too heavy and have a fixed “pitch” which may be quite unsuited to the prevailing winds of your locality. : This article will proceed to outline the 90 construction of a simple, reasonably light and quite practical “fan” which is built something in the manner they put autogiro vanes to- gether. It can be built by anyone able to use tools and has moreover the answer to your particular “pitch” troubles incorporated in its design! The first item is a ball bearing hub. This would be expensive and difficult to produce in ahome workshop. Fortunately this neces- sity does not exist as the junk yards are teeming with hubs, and spindles, too, ideally suited for the purpose. Any light car hub and spindle is adaptable although for small units the rear hub from an old motorcycle may be used. As the drawings show, this hub forms the starting point for the wind propeller. The blades, built up of plywood on formers, are spaced along the central spar and are adjustable to provide variation of “pitch.” How this is done can be seen quite Modern Mechanix Hobbies &

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WINDC HARGER Plants These efficient windchargers were con- structed from old auto parts at practically. —— no cost. Results equal expensive plants. S OLD AUTO WIRE WHEEL HUB (WITH SPOKES REMOVED) & DRUM BUILT-UP

METAL OR TURNED MAPLE SPINNER

FRONT VIEW OF PROPELLER HUB OLD FRONT AXLE__-- CUT DOWN AND BOLTED TO ae BEAM. ao PIVOTED BEAM sae er Junked automobile parts are ideal for use in building a sturdy windcharger plant. me HEAVY DUTY # g<— OLD. AUTO (GENERATOR f A SIMPLE BALL- BEARING MOUNTING * COMPLETE REAR PLYWOOD OR METAL A. HUB ANDORUM ‘VANE -SIZE 70 SUIT- BRAKE SHOES BOLT INTO SLOT REMOVED — CUT IN HOUSING REMOVE AXLE ON THIS A / SIDE -LOCK DIFFERENT- i

Sy IALGEARS — = ie ee h SON a “I = i j | MAKE SIMPLE SA AY BEARING y Mo NANS DRIVE SHAFT- + /, NU EXTEND AND { \CONNECT TO F UNIT TO BE i DRIVEN

WOOD (MAPLE) PULLEY-BOLT TO DRUM 2" x AH FAN BELT f F MAKE TOWER IS A cue “| | SA TO20 FEET HIGH BEARING i -A SUGGESTED REAR AXLE CONVERSION FOR WINDMILLS. A front axle cut down and bolted to the pivoted beam makes an ideal propeller mounting, The ball bearing hub of an auto wheel provided with a maple wood pulley is ideal for windcharger use. clearly from the detail diagrams. The central spar or tube may be of iron but it is far better to use a length of steel tube for this. Tubing such as is used in airplane construction is ideal for the purpose. The diameter of the tube is in direct relation to the diameter of the propeller you. plan to build. General proportions are shown in the accompanying drawings, although actual constructional de- tails may be varied to suit the builder’s own ideas and, to some extent, his materials avail- able. For instance, the blades are adjustable on the spar itself as shown, but two tubes may be employed and attached to the hub in such manner as to permit varying the pitch at this point of attachment if so desired. It is assumed that most amateur builders plan on using automobile generators for their wind electric plants. This presupposes some gearing up to insure adequate revolutions in a moderate breeze. To accomplish this a hard wood pulley is attached to the hub with Inventions, September, 1936 Mount the generator under the pivoted beam and gear to propeller with “YV” belting. a length of “V” belting to make the connec- tion direct to the standard generator pulley. The hub pulley for best results should be between 8 and 10 inches in diameter. Heavy duty automobile fan belts are excellent for the drive belt. For really large ambitious wind plants something more substantial is necessary. Many ingenious ideas have been developed and carried out with standard automobile parts. For a light windcharger plant an old front axle cut down and bolted to the pivoted beam makes an ideal mounting. In this case the wood pulley is bolted to the back of the brake drum with the fan belt connecting to the gen- erator which is mounted directly underneath ona bracket. A plywood vane of suitable size attached to the opposite end of the beam com- pletes the windcharger. For best results the device should be mounted at least twenty feet in the air either on a housetop or tower. 91

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CHECKING the CAR for Elusive SCRAPING BEARING CONCAVE SCRAPER MADE FROM HALF ROUND FILE Crankshaft pounding is caused by loose lal tele! Chess bearings. Tighten bearing bolts or scrape with a scraper made from a half round file as shown above. Use Prussian blue in the scraping process so that surface is made perfectly round and not oval. O MATTER how good an automobile motor may be it will eventually get noisy and begin to lose power. While the power factor is very often ignored the presence of noise is most objectionable. Crankcase pounding, valve hiss and piston slap are the more common REMOVING BUSHINGS & PINS BY CONTRACTION IN HOT WATER GROUN WN PIS =| SET TON 5 ON BLOCK -?" PISTON PIN OR BUSHING J To simplify the removal of bushings and pins from the piston assembly submerge in boiling water to expand the metal, then drive pins out with an old pin which has been ground down to serve as a punch. Place the piston on a block of soft wood during the removal operation. HIGH SPOTS TO BE SCRAPED CONSTRUCTION OF BEARING BEFORE REPLACING, OIL BUSHINGS WELL a After completing the scraping of a bushing it should be well lubricated, oil being spread out with finger tips. This completed, bushing may be assembled. GASOLINE causes for a motor to be CRANKCASE This bushing and pin remover is a handy piston tool. End of pressure screw should be sized to fit piston rod bushing so it may be removed freely. DIAPHRAGM noisy and lacking in its power output. While these items appear to involve special processing that can only be attempted by an experienced mechanic, it is possible for anyone with a fair knowledge of automobile construction to correct trouble. Noise caused by worn bearings can usually be detected by the loud dull sound produced. The same sound is present if they are merely loose, therefore first check for loose bolts and if the trouble is not here take the bearing apart and re-scrape it. A tool for this work can be made from a half roind file which has been ground into a concave blade. A similar tool can also be fashioned from a triangular file in the manner made clear by the diagrams. After smoothing off the inside of the bearing sections smear on a thin coat of Prussian blue then re-assemble the unit. 92 | SPARK PLUG THREAD CAUSED BY LEAK IN DIAPHRAGM OF FUEL — PUMP. REPLACE DIAPHRAGM IN. i FITTING FOR OILING S STEEL WASHERS J). FELT WASHER—*E CENTER PUNCH CYLINDER © TROUBLE /. FUEL PUMP DETECTOR ` MA SQUEAK A handy cylinder trouble detector for locating piston knocks and similar noises can made from an old tire pump pro- vided with double washers and threaded reducer to fit spark plug taps. Fuel pump squeaks can be eliminated as shown. Modern Mechanix Hobbies &

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Engine NOISES sss. su Until now only the most experienced auto mechanic could track down an elusive motor noise. This article tells how you can easily correct these annoying sounds. Turn the shaft several times in the bearing, then open the sections. High spots will clearly show up and should be removed so that shaft turns freely. Worn piston pins and piston rod bushings are also responsible for much of the trouble. An old pin ground down makes a handy tool for removing piston pins. A simple screw device similar to the one illustrated on this Z CORRECTION COUNTER BORE in iE H COMBUSTION VALVE SEAT STOP HISSING BASE BO. SCREWEO a FLOOR CARBON DEPOSITS CARBON IN COMBUSTION CHAMBER HOLE. A/ CLEAN WITH! N GASOLINE. STARTING MOTOR PINION SLAM IN CORNER. All valves must have a uniform apring tension if the motor is to perform efficiently. Springs may be quickly checked on the simple spring balance device shown above, The proper adjust- ment of the valve tension can be determined by referring to the cross section diagram illustrated at upper left. Asbestos: graphite packing in the counter bore will eliminate valve hiss. The starter motor mechanism should never be oiled. Instead plain gasoline should be squirted into mechanism from time to time, A small hole drilled in motor housing permits access to starter spring and the unbalanced pinion for pouring gas. Inventions, September, 1936 MOTOR oe BE REPORED THEN FITTED eee Piston slap is often due to one side of the cylinder wall being worn down, The only correction for this trouble is to re-bore all cylinders to the first oversize and use new oversize piston rings. The above diagram shows the cause for pistons to slap. page will aid in the removal of worn bushings. Placing the entire piston in boiling water for several minutes will expand the outer metal sufficiently so that pins and bushings will come out easily. Where the piston rings have caused the cylinder walls to wear rough, re-boring is necessary. For this work the proper hand drill attachments should be used to insure a perfectly true surface. When re-boring, grind out the cylinder to the first oversize and secure piston rings to fit so that there is no leakage of power. It is easy to find the exact cause for the particular noise your car has developed by using a simple cylinder trouble detector. Secure an old auto pump and install a double washer plunger on the shaft, then fit up the end of the pump with a connection threaded to fit a spark plug tap. When a cylinder is suspected remove the plug, screw on the pump then turn over the engine until the pump handle is forced upward. By removing the pan and allowing someone to hold the rod a loose piston can be immediately de~- tected. In assembling the pistons be sure to lubricate the surfaces of the bearing well by applying heavy oil to the inner surfaces and smoothing out with the finger tips. The bear- [Continued on page 126] 93

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Build A Swinging Desk Stand For Your Typewriter N HOMES where a typewriter finds occa- sional use in the library or study it must usually be carried from the closet and re- turned each time it is used. By constructing a simple swinging stand it can be permanently installed and pushed out of the way when not in use. The stand ean be built for about one dollar. Make the dimensions to suit your own re- quirements with the top of the stand just large enough for the typewriter feet to fit snugly into each corner. The bracket to which the top is mounted is of 144”x14” stock bent to shape as shown in the diagram. Attach the bracket to the top with machine bolts then form the “C” support and attach this to the desk with wood screws. Two machine bolts serve as the pins on which the stand swings. Modern Lawn Chair Easily Built i CANVAS OR RAG RUG Made from lengths of iron or steel rods, a piece of awning canvas and two-by-four wood supports the lawn chair above is an interesting and practical summer project for the workshop. WO lengths of scrap iron rod 1⁄4” in diam- eter, a six-foot length of 2”x4” and some bright awning canvas form the materials necessary for building this comfortable lawn chair. Bend the iron rods to the shape shown in the illustration, joining the top section with a six-inch length of gas pipe. Cut the 2”x4” into two pieces and shape them accordingly. A brace extending across the 2”x4”s forms a rigid support for the chair. Attach the colored canvas to the top of the pipe frame and to the crosspiece. The frame is painted in bright red and silver bronze. Bronze all metal parts and apply two coats of enamel to the wood construction. Strips of tin or chrome tacked over the 2”x4”s as indicated add to the chair’s attractiveness. 94 TYPEWRITER REST A È SUPPORTING BRACKET p ‘E ANGLE IRON TOP VIEW Constructed of inexpensive strap and angle iron, this type- writer stand offers a new convenience to home craftamen or students. Assemble with bolts and attach to desk with screws. Light Socket Forms Handy Switch NY porcelain cleat socket can be made into a useful foot switch for operating power tools. To a wooden button attach a strip of copper for a contact and wind a spring from stiff wire. Insert the button in the socket, mount socket in a wooden base filled with molten wax and the switch is ready for use. An ordinary porcelain tight socket, in which has been mounted a spring brass push button, similar to the one shown here, makes a practical foot operated switch for con- trolling home shop machines. Modern Mechanix Hobbies &

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| NS iza" PLYWOOD N : 3/4” PINE STRADOLE WHEEL BICYCLE TRAILER | 5/32" X 3/4" FLAT IRON STRAP IRON MEMBERS Y CONTINUE BACK AND EXTENSION WHEEL TRAILER COVER-cLEatS FIT INSIDE EDGES -OF BOX EN CLEATS 44" PLYWOOD! "STRAP IRON Ee MEMBERS EX- 7 TEND TO 7 REAR OF BODY 3/4It PINE 3732" X 3/4" FLAT IRON OR the youth who does the neighborhood chores a bicycle trailer will prove of much assistance in hauling ice and groceries. Both trailers described here employ a single wheel making it possible for them to follow narrow paths. With the conventional two-wheel trailer this is not possible. The builder has a choice of wheel mount- ings, in making the trailer, which best suits his requirements. One trailer features the straddle wheel while the other offers more carrying space, but has the wheel mounting projecting in the rear. In constructing the straddle wheel trailer first make a plywood box measuring 16 inches square with a well allowed in the center for the doenut air wheel. Make the towing bar from two lengths of strap iron welded as in- dicated and arranged so as to fasten to the coupling located on the bicycle frame just under the saddle. The rear wheel trailer is identical to the straddle type except that parallel bars support the wheel. The com- pleted trailers are painted in brilliant enamel. Inventions, September, 1936 RIGHT ANGLE |f TWIST IRON DISK BENT AND DRILLED RIVETED The bicycle trailers shown here need little explanation as can be seen by the above illustrations. Make the trailer boxes of plywood and mount the doenut airwheel in either straddle or extension fashion. Two forms of wheel suspension are shown. Simple Press Prints Book Plates HANDY little press capable of printing name cards, book plates and other small printed matter can be constructed in the workshop in an hour or two. All wood parts should be of hard maple. The pressure levers are provided with an off-center hole so that an impression can be readily made from a linoleum block or wood cut. After applying printers ink to the face of the cut insert it in the bed of the press face up. The paper to be printed should be moist for best results. Place this over the cut followed by the paper backing and last a steel plate. Pull- ing the levers makes the printed impression. COUNTER SUNK HOLES FOR SIDE ALL PIECES OF f- LO WOO, HARI p PRESSURE ‘ eae LEVER-I*THick-2 REQUIRED . MM Making your own cuts from inexpensive linoleum and printing attractive book plates in this simple press is fun. The press can be built in a few hours from several pieces of scrap maple. 95

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PULL-CORD CONTROL OPENS ERE’S a simple, automatic garage door control with which you may close your garage doors as you drive out and open them without leaving the car when you are ready to drive in. The illustrations explain clearly, the con- | struction of the various mechanisms required in the construction. When the doors of the garage are closed, a pull on the control rope “A” releases the 24-pound weight as in Position 2. The weight opens the doors and the catch on the stationary beam engages the first roller Stack to | bracket on the movable beam which holds RELEASE or | the doors firmly in a wind. The catch on the ROLLER | stationary beam is placed so that the movable S Aut beam will project about 18 inches beyond the ALB WT. door frame in full open position. e SERES EET Reset the 24-pound weight as in Position OF THE OPENING MECHANISM seems, pr sapaar, R ç z Sas 2 5 r k NG Aw SPLICING THE Ñ ae CONTROL POSITION ALLOW THE WT._TO DROP AND OPEN ROPE(A)IS BEING PULLED POSITION =A TRIGGER CATCH IN RELEASE POSITION ROLLER) FROM / DOORS ARE OPEN, WT, IS BEING RESET A THIS CATCH ENGAGES ROLLER BRACKET TO HOLD DOORS IN OPEN POSITION. FORM FROM ANGLE IRON PLATES REINFORCE ENDS OF DOOR ARMS ee “Se DETAILS OF HINGE FROM ARM TO DOOR REINFORCING PLATES FOR MOVING BEAM Details of automatic controls and weights are given above. Re-inforcing plates on moving wooden parts will prevent wear. As a safety measure, box-in weights. 96 Modern Mechanix Hobbies & px ; HO.WGOD ARM

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GARAGE DOORS Automatically - 1 then drive the car out of the garage. A pull on the control rope “A” will release the catch holding the doors open, and the 11- pound weight will close the doors by its pull on the rope “D.” Rope “B” is spliced to ‘rope “ʻA” at the proper point to make this operation possible. It should be noted that while the doors are open, a pull on the control rope “A” will release the catch on the stationary beam, but rope “E” prevents the release of the trigger catch controlling the drop of the 24-pound weight. You will not find it necessary to leave the car to operate the control from the time you drive out of the garage until you have driven the ear into it again. Always remember to reset the 24-pound weight each time you leave the garage, whether you are driving in or out. NTROL ROPE, TO POST L PAA exsbeewes | ae After backing the car out of the garage, the driver merely ROPE TO i ‘\ eg it has to reach out the window and pull the cord, thus GARAGE |] CONTROL ROPE, Wi . closing the doors. A second pull on return opens them. DOOR a SEE DETAIL 3'INCH r ——_—_—____=_______=_=_=_=_=_=_=_=_=—_=_=_=__ X oe PULLEY vod KNOT AND WASHER TO ALLOW RESETTING PULLEY f aN WILL NOT SLIP THRU OF 24 LB. WT., ROPE Pai ROPE © To DETAIL 24LB.WT. WAM = SEE DETAIL s : DIRECTION Xt" HD. WOOD ARMS OF LENGTH OF PULL, AS TO HOLD DOORS AT CORRECT 24L6. WT. ANGLES WHEN MOVING BEAM IS IN "OPEN" POSITION SCREW-EYE MUST MOVE FREELY REW-EYE THRU SC ) IN THIS DIRECTION THIS WT KNOT s REW-EYE NY oa THIS ROLLER BRACKET A CATCH ENGAGES wa, HOLDS DOORS OPEN f ROLLER BRACKET i va WHEN ENGAGE wee j ue BY CATGH DETAIL f SPRING SCREW-EYE 2"X 4" STA. BEAM GARAGE | A SPACE TO PASS DOOR A 22" CATCH EASILY DETAILS OF BEAMS 4"X 4" CONTROL j MATAWI KEEPS IN CLOSED POSITION- ` POST IS SET IN ‘ OP e BWT KEE SERVES „GROUND : : so AS HANDLE TO $ 7 RESET 24L.6.WT, SUSPENSION. 2"X 4" IS CUT AWAY TO ALLOW : THE MOVING BEAM ROLLERS TO PASS STATIONARY BEAM : ‘ROLLER | HLB. WT, IS IN POSITION BRACKET TO CLOSE DOORS AS AR 5 SOON AS CATCH |S MOVING BEAM RELEASED ` s i PHANTOM VIEW OF Bae EARNING. GARAGE, SHOWING THE OPENED PORS E LOCATIONS OF BEAMS, ROPE S, l WEIGHTS AND CONTROL POST. Suspension of the stationary beam is clearly illustrated. This beam runs the full length of the garage door to insure rigidity. The rollers should be kept well lubricated. Inventions, September, 1936 97

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Inlaying with Colored Sealing’ Wax a by G. A. MOLECEY HERE the inlay artist of old set mosaics with ivory and semi-precious stones, the modern workshop fan melts stick shellac with an electric iron for his inlays. Venetian Marquetry, an art that is rapidly being lost, can be successfully reproduced in the home workshop with no particular skill required to duplicate the strength of design and delicacy in workmanship of a 15th century artisan. As in relief wood carving, designs may be selected from magazine illustrations or draw- ings and traced on the wood. Tools can be minimized to an electric soldering iron, sharp short bladed pen-knife, a few chisels and, where procurable, discarded dental tools. Materials are inexpensive and include several bars of colored stick shellac, available at any 98 Ss Beautiful Venetian Marquetry: can be produced in the home workshop by using ordinary colored stick shellac for the inlay material. The inlay above work was done with the simple tools shown at left. Suitable de- signs may be traced from magazine illustrations, paint dealer; thin tracing paper, white office or wall paper paste, a pencil, two or three bottles of waterproof ink in various colors and a small water color paint brush. Marquetry, or inlay work, of this type is particularly adaptable to decorating cedar chest lids, wood panels, checker boards and table tops. In making a small table head de- sign similar to the one shown here, select kiln dried stock of cedar, mahogany, bass- wood or oak and finish the surface to a satin smocthness. This done trace the design selected on thin tracing paper. The picture, “Birds In Com- bat,” used on the original project was traced from a color plate illustration in a bird book. The tracing completed, brush a thin coat of paste on to the wood and lay the paper over it. Center the design so the longer cuts will follow the grain as much as possible., Make sure the tracing is pasted down absolutely smooth and free of wrinkles then set aside to dry thoroughly. Cut over the tracing through the paper and into the wood to a depth of approxi- mately one-eighth of an inch with a razor sharp penknife. After checking the tracing [Continued on page 124] Modern Mechanix Hobbies &

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Telescopic Finder Improves Camera Pictures F YOUR camera depends upon a scale focusing device the chances are that many pictures are ruined because you are a poor judge of distance. By using a focus finder on the camera all chance of errors will be eliminated since the finder automatically sets the camera bellows to the proper focus. Make the telescopic unit from aluminum or brass tubing and in- stall an objective lens of the same focal length as the camera lens in one end of the large tube. In the smaller tube insert a ground glass so that it will be in a position equal to the focal length of the objective lens. About two inches in back of the ground glass and at the end of the smaller tube mount a small magnifying lens for an eyepiece. Attach a wedge catch to the smaller tube and a bolt to the larger tube for mounting to the camera. Film Pack Serves As Novel Printer Using a film pack as an emergency printing frame is accom- plished as pictured above. Take film pack apart, insert a glass over opening, then the printing paper and finally spring back. HE metal parts of a film pack can be quickly converted into an emergency printing frame. Take the metal casing of the pack apart and lay a piece of clean glass over the film window. On this lay the negative followed by the sensitive printing paper and on this a stiff piece of cardboard or fiber for backing. Replace the rest of the film pack so that spring strips will hold the paper and film in close contact. While this arrangement is at best a makeshift affair it will prove helpful when a suitable printing frame is not avail- able. Old film packs may also be cut apart with tin shears and used as printing masks. Inventions, September, 1936 This telescopic attachment will insure your camera taking sharp pictures. Turn down tubes from brass or use pre-formed aluminum tubing. is brought into focus by adjusting camera bellows until object is sighted. Finder Box Camera Takes Aerial Photos N ORDINARY dollar box camera attached to a suitable kite will make excellent aerial photos. To the camera attach a small metal clip for holding a piece of Chinese punk. Slip a thread loop around the punk and camera shutter release and a rubber band from the release to a small tack on the op- posite side so that the burning punk will eventually burn the thread and snap the pic- ture. Camera is suspended from kite string. J NOTCHED TRIGGER SMALL NAIL PIECE OF BURNING PUNK Se TUBING SCREWED TO CAMERA SIGNAL PAPER ATTACHED TG STRIN Attached to a large box kite your inexpensive camera can be used to take interesting aerial photos. Slow burning punk is used to release camera shutter in manner shown in diagram. 99

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A Midget Foot-Powered Locomotive CAB ROOF MAY BE MADE TO LIFT ON HINGES FOR EASY ENTRANCE by MANLEY MILLS NOTCH FOR "Xi" STRINGER FORMER "B" iS OF PLYWOOD, Ym THICK Y% PLywoop SIDE PLATE BRACKET 34 x" PEDAL & MOUNTING —— DETAILS SECTION THROUGH "X" $6» UILT mostly from discarded materials that can be readily picked up about the workshop this novel foot-powered midget locomotive will make any youth the envy of his friends. Unlike the usual foot propelled locomotive, this one permits the engineer to ride in the cab instead of in the tender. While it isn’t necessary that the dimensions given here be followed out to the Nth degree, they should be followed as closely as possible in order that the locomotive will operate properly. In constructing the engine and tender start with the frame for the boiler. This is made from lengths of 3”x1” stock as is the rear cross-member and pilot beam. The pilot trucks are made from the front end of a coaster wagon chassis equipped with 9’ THe CHASSIS DETAILS 8 aaa X PEDAL CRANK BRACKET PILOT Y% PLYWOOD SIDE PLATE 12" pe——_ p 6"! 14) eg j j! gu 6" ja i SAFETY | STEAM 7 | HEADLIGHT VALVE | DOME JY ISA SMALL pee FLASHLIGHT 10" X16" OF THE WINDOW 9" COASTER WAGON WHEELS m] |! a 2 G M 34X 2",PIVOT ON 38" CENTERS Fe—WHEEL-BASE 40'———» The above pictorial diagrams show the simplicity of the toy locomotive. sions given here adhere to them as closely as possible. 100 While it is not necessary to follow the exact dimen- Parts from broken toy autos and wagons will aid in construction. Modern Mechanix Hobbies &

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That Any Boy Can Build wheels. The pilot guard is fashioned from either wood strips or strap iron, the latter being suggested. The boiler is of the thinnest gauge sheet metal obtainable and attached to a suitable wooden frame with small wood screws. The cab is made of plywood except for the roof which is of the same metal as the boiler. Sheet metal attached to a wooden supporting frame forms realistic cylinders for the driving rod mechanism. The drive rods being noth- ing more than lengths of stock measuring 34x2x38” are extremely simple to make. A pair of 20” bicycle rims are screwed in place over a dise having a diameter equal to the inside diameter of the rims. A notch is cut in the discs to allow for inflating the tires. The drive shafts are attached to the wheels [Continued on page 120] roar | s STRINGERS er j4 SQ. RUNNING BOARD What boy wouldn't be proud to S NS FPORT ONTBACKIOFIN be engineer on this locomotive. CYLINDERS YX!" STRINGER AND Cfoss Heap ASSEMBLY* ~~ | ASSEMBLY ` CROSSHEAD GUIDES WB x m PATTERNS OF FORMERS AND is A = BOILER SUPPORT, SCREWS ine —— ALL OF h STOCK 3 FRAME INTO [cia Foster OS E i LEATS END OF ROD % SQ, moO O DETAILS OF CRANK-THROWS ON | È| : DRIVE-WHEEL AXLE l AWG = %, fA : : ji fi ays eye n ae at lay je — 15, = EE Daea 2G" m % sa. la SECTIONS OF SUPPORTS CAB FRONT AND FRONT OF TENDER BOOY _ PEDALS 4s" we l MAIN -ROD \ Axr ò BEARING AXLE IS OF 1S FASTENED HERE BOCK YW) STOCK TO AXLE = DRIVING MECHANISM = REAR View of CAB The above diagram shows the construction of the driving mechanism and ite approximate location inside the cab. Inventions, September, 1936 101

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NEW STUNTS For The AUTO MECHANIC SHANK FITS INTO ae "i Dentists Drill Cuts Oil Groove In Bearings ROUND URES 4 HE usual difficulty experienced in cutting oil grooves ENTIST’S DRILL POINT in babbit bearings is eliminated by the use of dis- carded dentists’ drill points in a small hand electric drill. Neat, clean grooves of any desired depth and width may À be easily cut by this method. Since drills of this type BEARING 1 SS | ¢annot be resharpened your dentist will gladly provide them to you gratis——Arthur C. Klust, Minneapolis, Minn. Auto Pump Locates Leaky Valves N AUTO pump is a valuable aid in locating leaky valves in your car’s motor. Break away the porce- lain from an old spark plug and solder an inner tube stem in the spark plug shell. To test for a leaking valve flow a small amount of lubricating oil around the valve so a perfect seal is made, Next attach the auto pump to the valve stem which has = been inserted in the respective spark plug tap. With one BOLD VALVE WITH seem hand hold the valve down and at the same time force the EOMP ae T pump handle down. If the valve leaks, air bubbles will form in the oil film, indicating that a leak is present. Leaking valves thus located may be ground down and the process repeated until there is no leakage present. All valves may be checked in this manner.—Clayton Farley, Co- F ; lumbus, Ohio. Starting Motor After Running Out Of Gas N MODERN automobiles the well-known vacuum tank is no longer used and starting up the car after running out of gas is quite a problem unless you know the method of procedure. The air filter on the carburetor is removed and a few drops of gasoline injected directly uiscreweowere] into the carburetor. Stepping on the starter will im- mediately set the motor into operation. The filter being held in place with a single machine screw is easily re- placed after injecting the gas. It is better, of course, to watch your gauge and not run out. of gas—Vernon Tracey, Centerville, N. B. be aa WHEN DRAG IS FELT IN| ees Blige Ae! TURNING, BEARING IS | y f q READY TO BE TIGHTENED | AIR CLEANER Wax Paper Makes Ideal Bearing Adjustment TIME saving and accurate bearing adjustment can be accomplished by using a piece of wax paper. Cut the paper slightly smaller than the bearing surface then insert between the crankshaft and bearing surface. If no Genser tight drag is felt when the crankshaft is turned, file down BEARING the bearing surface until the shaft turns, but is sufficient- ly tight to require effort in turning. When the shaft can be turned it is an indication that there is sufficient clear- ance for the oil pressure system to function—A,. O. Detjon, Maywood, Ilinois. 102 Modern

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PHOSPHORUS OXIDES ` INTO FIRE WHEN EX- POSED FOR 5 MINUTES WATER ‘ PHOSPHORUS Z, Z / bj: ALCOHOL LAMP “Y, / See Les A x BR S When placed over a flame this bow! of water glows with the PROSPHOMLS BETH EEE: {pe incest brilliance of a fire ball when the lighte in the room are turned DROP IT INTO WATER AFTER BRING- | out. The secret of the stunt is the dropping of a small piece of ING TO A BOIL phosphorus into the water after it has reached the boiling point. h chalk before handling the raw phosphorus. BLACK SNOW CIGARETTE GRIND THIS MIXTURE TO A POWDER AND PACK TIGHTLY IN A CIGARETTE, IGNITED, WILL GIVE OUT A HEAVY BLACK SMOKE Dust the hande wit! OW CIGARETTE } ? PHOSPHORUS y Oe (a OF PHOSPHOR- US_IN END OF CIGARETTE ~ REPLACE TOBACCO — ; USE WITHIN £ MINUTES, GIGARETTE WILL GIVE OFF HEAVY WHITE SMOKE RESEMBLING SNOW. AY BE R BALLS M LENE CAME TUTED FoR NAPTH SMOKE MIXTURE i74" OF TOBACCO When properly treated with the smoke “a mixture given above any cigarette can 7 | be made to produce clouds of black £ 4 smoke when ignited. The smoke is soot A black, yet harmless if inhaled by your- self or anyone receiving the cigarette. \\MAGIC CANDLE Upon lighting this cigarette volumes of white smoke issue from it to the amazement of the onlookers. Prepare the cigarette by removing some of the to- bacco from the tip and inserting a piece of phos- phorus the size of a rice grain, then replace the tobacco in the tip. COAT TOP OF WICK WITH x MIXTURE OF NY a 5 GRAINS OF 9 HILE all stunts described above are harmless, care should be exercised in ; A UGAR AN ; the handling of the phosphorous and sul- USE STICK AND i a MOISTEN WITH phuric acid (H,SO,). Prosphorous when = H2 504 exposed to open air for periods longer than iik: WTH WATER: AS SOON AS THE two minutes will burst into flame, therefore } WITH THE SUL ag s fe PHURIC ACID, IT submerge it in kerosene when not in use. À BURSTS INTO To protect your fingers from its effects pow- AE der them with chalk or talcum. A pair of small forceps may be also used, if available, in handling small pieces of the chemical. In handling the sulphuric acid be sure that none drops on clothing as it rots material. Lighting a candle with a liquid instead of fire will amaze and mystify your friends. Coat a charred candle wick with the solution given above and allow to dry. The candle is ignited with a drop of sulphuric acid. Inventions, September, 1936 103

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Practical MODERN FURNITURE IRON WORK FOR CHAIR & TABLE 3/4" RADIUS CHAIR ARM 2 REQUIRED 2 REQUIRED TO FASTEN END BY NIB AND HOLE Q UPHOLSTERY Modern furniture is easy to make. The upper arun DALY a 3 x ig N photo shows how a scratch wheel may be used to i - 3 NEENA eerie give the metal a bright finish after which it is Bae Cette es lacquered. Center photo is shown the table top j FLUSH a being squared up on the shaper with the leg installation clearly defined in the lower picture. Not only is this modern table and chair ducable, but very attractive as well. Constructed of strap iron and plywood the furniture can be worked into the color scheme of any home. Forming of the metal parts can be done at home by following the diagrams given here. The height may be S TABLE TOR FABRIS $ altered to meet the particular needs although care should be taken to keep one leg or chair arm from being higher than the other. The furniture ia covered with plaid fabric. 104 Modern Mechanix Hobbies &

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FOR THE WORKSHOP FAN For the home shopman who makes his own, these interesting pieces of ultra- modern furniture are certain to win favor. ANY pieces of the wood and metal modernistic styled furniture that is now so popular can be easily duplicated in your home workshop. If you are the owner of a few woodworking tools and have access to a strong vise and forge you are ready to start construction. If you don’t have the latter equipment any blacksmith shop can quickly form the metal for you at a nominal charge. The modernistic chair and table pictured on the opposite page are extremely simple to make and when completed prove unusually attractive. About 32 feet of 3;”x2” strap iron, three pieces of 34” plywood, one piece 48”x22” for the table top, another 19’x1014” for the chair back and a third 19”’x15” for the chair seat are the only materials required. The strap iron for the table legs is bent according to the dimensions given in the diagrams. Holes drilled and countersunk in the metal allow the table and chair legs to be attached to the plywood. In making these metal pieces make certain that they match so that the furniture sets level. The height of the table may be increased to meet your particular needs if desired. The chair may be constructed with or with- out arms. If arms are desired cut nibs in the strap iron so that the formed metal can be rigidly mounted to the chair legs. To do this drill holes in the leg and back supports, insert the arm nibs then hammer them flat as you would rivets. The table top, chair seat and back are finished by covering them with a water-proof plaid material similar to the coverings used on cardtables. Cotton wadding under the material will greatly improve the appearance of the project. After removing all rust par- ticles from the metal it can be enameled in a color that will contrast with the plaid ma- Inventions, September, 1936 terial, Probably the most attractive combi- nation is a red, orange, green or blue plaid with the metal parts finished in silver bronze although any combination may be used. Twin beds in the modern trend of design supply another idea for the ambitious shop- man. The beds, which are ideal for a small guest room, consist of four units; head, foot and two side rails.. The head and foot pieces are made of 1⁄2” plywood panels with a 34”x 2” trim around the edge and mitered at the corners. The trim is attached with finishing nails and casein glue after which casters are mounted. The bed rails are of stock 34”x6”’x6’x2” with bedhooks attached to each end. These being obtainable at any hardware store. Slots cut in the head and foot pieces allow for 105

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For the small guest room what could be more attractive than a set of modernistic beds? Using standard 37”x72” box springs the bed can be constructed at home with hand tools. The table and rack are also easy to make. inserting the rails. After construc- tion is completed sand all parts well and finish in white enamel. A small table and hanging shelf, although extremely simple to build, will greatly improve the room in which The beds are made from plywood with a mitered edge of the same _ NIGHT. material adding to the furniture’s TABL charm. Table and hanging shelf the beds are used. These are also painted white so as to harmonize CORNERS MITREO 1172" PLY~ WOOD PANEL GIS ara x 6" ' xe" with the other fittin gs The last s ug- are simple and need no explaining. gestion in the line of modern home fur- nishings is an occasional table that is ultra-modern in its design. Con- structed entirely of metal and plate glass the table is certain to gain the attention of everyone who sees it. The table is formed from 34” and 335” square cold rolled steel, the ” 34” stock being formed into rings having a diam- eter of 30”. The rings are assembled with lengths of stock measuring 10” in length. The L shaped shelf supports are made of the lighter $” stock and bolted in place with machine screws. The ring feet and table top supports are cut from 2” pipe and fastened in place with either bolts or rivets. The table is provided with three plate glass sections. The uppermost measures 16”x30”, the middle one 10’x2444” and the bottom shelf 10”x21”. If desired the glass may be colored or better, a colored plastic material may be used since this ma- terial is unbreakable. The metal con- struction may be finished in white The occasional table at enamel or silver fighe i made of pavare bronze with foot rings and jointed with i Z cross pieces. The shelves ‘Tings in black. are panels of plate glass. 106 MODERN STOCK OCCASIONAL © TAB i i } 2i" as) =A m= 16" 1 i “ = TE 3/16" RIVETS = j 3/8" sa: O O 5" 30: | | | | E E 378" SQ- 2" x 378" PIPE 5/16" X 172" SCREW. SN 18" 5/16" SQUARE Modern Mechanix Hobbies &

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Make a Low Cost Boom For Your Sail Boat N INEXPENSIVE boom for Pemes = small sail craft may be con- structed from odd lumber which has been tapered into a top and leg piece, then assembled to form a “T.” Angle iron strips are at- tached to the end of the boom and to these are attached a universal joint made from a block of cold rolled steel or brass. A bracket attached to the mast with a lag screw completes the mounting. Either bolts or pins may be used in mounting the boom to the hinged joint. A slot in one end of the boom allows for the pulley. The sail is attached to this boom in usual manner. No dimensions are given since the construction depends en- tirely upon the boat on which sail is used. cA HANNEL OR RAP IRON Hinged Rudder Prevents Damage Xl" HINGE CUT TO FIT ` BOAT FRICTION J SPRING STEEL ARI CATCH ~] -2 REQUIRED Bi conan By providing a hinge in the rudder mounting the craft is free from damage if it runs aground. Make the friction catch, as shown above, so that it will hold the rudder when sailing. ROVIDING your canoe with a rudder that will swing upward when it strikes an obstruction or is beached, will eliminate damage to your boat in the future. Cut a 6”x1” piece of hardwood to match the curva- ture of the boat then mount this to the stern. A similar piece of wood is attached to the first using a hinge and a friction catch. The regular rudder is then installed to the hinged section with screw eyes. The hinge and catch on the 6”x1” strip allow for rudder’s release. Inventions, September, 1936 TOP- CUT AWAY ` 3 q FOR PULLEY Çp- SCREW EYE ()-e-PULLEY BOOM SAILBOAT — This novel boom is constructed from twe pieces of ordinary one-inch stock bolted together to form a “T”. Measurements depend entirely upon the boat on which the boom is used. No dimensions are given here since Bent Boom Increases Sailing Speed AVAL architects claim that the use of a bent boom will increase the performance of any light sail boat since the curve allows the wind to supply more pressure to the sail. To bend the boom on a light craft drill a hole in the front of the boom large enough to pass a %4”x1,3,” hex bolt to which has been at- tached two steel lugs. On the opposite end of the boom fasten a screw eye large enough to pass 4” diameter steel yacht rigging cable. Splice one end of the steel cable to a lug. then thread it through the eyelet on the other end of the boom returning it, finally, to the starting point. A turnbuckle is used to draw the cable taut. Make a brace from a piece of hard stock so that when finished it measures 34”x114”x12” and insert this between boom and cable just opposite mast as illustrated. BOOM MAST TURNBUCKL 174" x1 9716" |B HEXAGON HEAD BOLT LUG— 17168 sree. ta REQUIRED By bending the boom to the curvature shown at the top of this diagram the efficiency of any boat is increased by at least 20%. A steel yacht cable permits boom to be bent bow-like. 107

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TURNING CLAY PROJECTS on

The throwing wheel, on which the pottery is turned, is cut out of plywood on a power jig saw. The bottom of the disc is provided with an undercut belt groove. The drill press is reversed and the wheel attached to its chuck. by DALE R. VAN HORN OMETHING new in home workshop projects and seldom attempted by the amateur is the turning of pottery articles. Not only is the making of clay articles in- teresting, but simple if your shop includes a floor type drill press. The extreme rigidity of the modern drill press makes its adaption to turning a potters’ wheel ideal. The first step is to reverse the chuck and motor position with the chuck under the table and centered with the center hole. To bring the end of the motor shaft in line with the wheel groove it was necessary to cut out a board for the purpose, drill the necessary holes, then bolt it to the motor support as a photo shows. The largest wheel possible to use with this drill press is one about 14 inches in diameter, so this was cut from 5-ply wood with the jig saw. To utilize as much of this large diameter as possible for speed reduction, yet get the belt just under the edge where occasionally mud and water would not work under it, a groove was cut with one of the shaper knives to the shape shown. An ordinary sewing machine belt was used. Two turns of friction tape wrapped about the motor shaft itself and the belt run di- rectly on the shaft will provide an ideal speed of about 114 R. P. M. A belt tightened with 108 PLYWOOD WHEEL, _- BRADS 4"APART — af

| Z | GROOVE FOR BELT PRESS HOLES HERE ey x h FEANGED PULLEY USE ANY THAT HAS . 1/2“ HOLE d HOLES FOR BRADS

1/2" STEEL f A ROD 4"-6" § PLASTER PARIS LONG œa PALETTE | - EEE FULL A p— a ASSEMBLY | A

if THIS END FITS REGULAR SEWING INTO DRILL CHUCK MACHINE BELT SS ,

A steel Ranged pulley screwed to the bottom of the plywood dise completes the throwing wheel assembly. A short length of -inch steel shafting connects to the flanged wheel and the drill press chuck as described above. Plaster of Paris palette is attached to the top of the wheel with small brads. A regular sewing machine belt transmits the power from motor to wheel. Suitable clay for pot: tery work may be se- cuted from a local brickyard for a few cents. he clay is handled in the same manner as dough after which it is rolled out, as illustrated above, into long rolls using a flat board for the working tool. In making the coils it is advisable not to have the clay too moist, SN otherwise it may stick z to the forming tools. Modern Mechanix Hobbies &

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A POTTERS’ WHEEL Attractive vases, crocks and jars of baked clay can be produced in the home work- shop. An ordinary drill press forms the basic throwing wheel equipment. an idler pulley to be operated with the foot will provide graduated speeds. This can be clamped to the drill press table and removed when wanted. Of course, with a little prac- tice you will be able to turn out nice pottery pieces with the constant speed wheel. Floor flanges are not accurately drilled, so a better line up results if any ordinary grooved pulley fitting a half inch shaft is drilled for 2, 3 or 4 screws midway between Tim and center and this fastened to the exact center of the plywood wheel with wood screws. The 4 or 6-inch half inch shaft is then fastened in the pulley wheel with the set screw provided, and the other end of the half inch shaft set tightly in the drill chuck. Start the project by applying a pliable lump of clay | to the plaster palette then with the throwing wheel turning at a speed of about R. P. M. spread out the lump with a broad putty knife as shown here. SMOOTH STEEL ROD WIRE a Only simple homemade tools are required for turning pottery projects. These consist of a simple elbow rest, a fiexible putty knife, steel rod and clock spring mounted on a handle. THRU VASE Inventions, September, 1936 Above is pictured one of the completed pieces of pottery turned on the home throwing wheel with the various stages in its construction shown below. ote that the clay rolls are placed around the palette gtadually and more added as the bottom is completed. The neck of vase is added last and this turned to shape, carefully. The wood wheel should be given a double coat of clear lacquer or varnish and special attention given the rim, both top and bottom, to render water proof. Two or more palettes should be made from plaster of Paris. Mix the plaster and pour it out on a flat surface to harden. Then drill two holes to fit the brads in the wood wheel, drop in place and with a file tang held vertically and the wheel in motion, cut through the surplus plaster to leave a round palette upon which pottery is to be made. [Continued on page 128] 10S

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. A LEAD PLATE BUD VASE BASE. OF VASE -# READY FOR PLATING The above dimensions are for the inside wood core. After lead is formed over wood the dimensions will be slightly greater due to lead being +" thick. In the center pic- ture is shown the lead vase after completion. SHEET LEAD IS we HELD IN PLACE BY TEMPORARY RUBBER BANDS - HOPMEN who like to make things that are different will find this novelty bud vase an interesting lathe project. The materials used are wood, metal and glass, with a test tube doing duty as a container. Fasten a wocd block to the small center screw face plate on your lathe and turn it down to a thickness of one inch. This done turn down. the outer 3% inch of the diameter to % inch thickness. The diameter for the first 4% inch is 33g and the next % inch, 34% inches in diameter. Insert a small drill into the center until it touches the face plate screw to guide the drill accurately when the center hole is bored for the tenon of the upright. The upright is turned from a piece of scrap 2"x2”x8”, with a final height of 734 inches including the %-inch tenon turned at the bottom. Turn down the upright as shown then sand smooth and remove. Replace the base on the lathe, cut a strip of 1%” sheet lead for the base edge, trim the ends so they just meet and hold secure with wide rubber bands. Solder where the seam is exposed, then shift c SE £ OMPLETE VASE PLATED AND READY FOR POLISHING- Turn down the base from any available stock following the dimensions shown in the upper right hand corner of the page. The base appears in the top picture in this group. In the center is shown the manner in which sheet lead is attached to base, for forming, with rubber bands. The bands hold lead in place so that seam may be soldered rigidly. The lead is attached to the upright wooden turning in the same manner. A maple dowel serves as lead forming tool. Vase should appear as shown in lower photo after forming is completed. 110 the rubber and finish soldering. With a slow lathe speed, trim and true this lead sheet, using a wood turning chisel, then with a maple dowel and the end of a candle for lub- [Continued on page 120] Modern Mechanix Hobbies &

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HERE are still many radio fans and ex- perimenters who find headphones val- uable for tuning in distant stations or listen- ing to programs during the late hours of the evening. For those, this kink will be of special interest and for others it is well worth knowing. When headphones suddenly go dead the cause is usually due to an open coil in the phone unit. To correct the trouble secure a 50,000 ohm carbon resistance of the “pig tail” variety and connect it across the earphone terminals of the set and the phones will again function although some of volume will be lost. Since headphone coil units are connected in series one little wire breaking will result in the entire headset failing to work. While the resistance method is ideally suitable for a temporary repair job it is advisable to check the coils for the open circuit and make the necessary repairs by unwinding the fine toil wire until the break is located then soldering the fine wires carefully together and winding the coil to its original condition. Since the fine magnet wire used in the ear- phone construction is usually enameled the enamel must be carefully removed before any attempt is made to solder the broken leads. A crystal detector unit connected to a four prong tube base as described in the above illustration will make a practical tube substitute when one of the set’s tubes suddenly fails. Inventions, September, 1936 50900 OHM RESISTOR When a pair of earphones suddenly refuse to function it is often possible to correct trouble by connecting a 50,000 ohm resistance across the receiver phone terminals as shown here. Crystal Is Handy Tube Substitute N EARLIER types of electric receivers and practically all battery sets a crystal detector makes an excellent tube substitute. For the experimenter who likes to try new stunts this one should prove most effective since the volume of the receiver will depend upon how careful the “catwhisker” has been adjusted on the crystal. First secure a crystal detector unit and mount this on a 4-prong tube base using heavy copper wire to hold it rigid. If desired, of course, a fixed detector can be used instead of the adjustable type. The leads connect to the plate and grid prongs of the tube base, these being the two small ones; the large prongs are left disconnected. When a tube suddenly burns out and a re- placement is not on hand insert the crystal into the socket in question, adjust the “cat- whisker” carefully and once more the set is in working condition. 111

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“MM METAL TUBE MASTER” — e Employing the latest metal tubes this unique « portable sound system can be constructed in the home vare bor | @ Above is shown a rear view of the MM Master with the lid of the cabinet raised. The speaker attaches to the chassis. by J. R. MACK Small enough to carry around yet ‘extremely powerful, MM Master is an ideal sound system. EARLY everyone at some time has wished for his own portable public ad- dress system either for supplying music for a party or in making announcements at out- door gatherings. Practical portable sound systems are usually expensive, therefore placing them beyond the reach of the average income. Realizing this fact an amplifier was decided upon which could be constructed by anyone the least bit familiar with radio. Through the use of modern metal tubes and a high-gain circuit the completed public ad- dress system offered all of the advantages of the expensive equipment yet it cost less than Appearing more like a travel- $25 to build. ing bag than an amplifier con- Parts for building the amplifier may be tainer this case mad of i $ leatherette and. wood nicely purchased from any mail order or local radio solves the carrying problem. 6C5 TUBE 6F6 PP INPUT TUBE - OUTPUT TRA ™x, TRANSFORMER x € 500 OHM LINE VOICE COIL Pd INSTRUMENT PICK-UP JACK A SPEAKER PICK-UP AND - ; “SWITCH PLUG MIKE & PLUG CARBON MIKE =k TRANSFORMER “= L ht I The experienced radio builder will find this schematic diagram helpful in wiring up the amplifier, Wherever possible connect leads directly to the ground so as to eliminate all unnecessary wiring, Pick-up and microphone jacks should be insulated from panel. Since all metal tube sockets have the same number of prongs care should be exercised so that connections are made correctly. Although indicated at 550 volts, power transformer can have plate voltage output of slightly more or less than this. 112 Modern Mechanix Hobbies & POWER TRANSFORMER

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A PORTABLE SOUND SYSTEM supply house including the metal chassis although it is quite simple to make this your- self from No. 16 galvanized sheet iron. The panel is laid out according to the dimensions given on the diagram and then bent to shape. Any tinsmith will do this work for you for a small charge. The sockets for the metal tubes are in- stalled first, after which the power trans- former, A. F. transformers and other mount- able items are fastened in their respective positions. The speaker is a 12-inch dynamic type mounted to the front of the chassis with machine screws. The field coil winding of the speaker serves as the filter choke thus saving valuable chassis space. A type 5Z4 tube serves as the rectifier with two 8-mfd. electrolytic con- densers providing the necessary filter capacity. [Continued on page 124] Here is the completed Master be- fore installing in the carrying case. Ñ Although a workshop job it has | all the makings of an expensive manufactured amplifier. For best sound coverage a 12-inch diameter dynamic type speaker is suggested. NOTE? 6 VOLT LEADS CONNECT TO H>H PRONGS ON TUBE SOCKETS FILTER - CHOKE 500 OHM LINE 250 OHMS 500,000 VOLUME CONTROL N no VOLTS No advanced radio experience is needed to build the MM Master. The above pictorial diagram shows the exact place- ment of all the necessary parts. “TACK Inventions, September, 1936 oll BK, LYTIC COND. EN G CARBON MICROPHO! CHASSIS DIMENSIONS The chassis is cut as shown from No. 16 galvanized iron. The cabinet is. of wood covered with CUT HOLE. FOR SPEAKER leatherette material. DIMENSIONS. OF PLYWOOD CABINET. w SPEAKER MICROPHONE TRANSFORMER 113

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TIMELy Tips For THE HOME SHOPMAN TO TABLE Sree, Pin Simplifies Difficult Drilling k HE difficulty of drilling through irregular shaped metal can be greatly simplified through the use of this centerpunch support. Turn down to a point a short length of steel rod having the same diameter as the hole in the drill pad. Harden the point by heating white hot soup works | and plunging into cylinder oil. When cool insert in the CENTER INO drill pad and place the work on the point for easy drill- MATCH DRILLING =` ing.—H. Walton, New York. Paint Line Aids In Making Angle Cuts HERE pipe must be cut off at an angle it is no easy task to mark it off so that a uniform cut will result. A sure way of marking an accurate “cut-off” line is to place the pipe in a container partially filled with kalso- mine or white wash solution. A board nailed to the side of the workbench at the correct angle will serve as a = guide in marking the pipe. When a length of pipe is to e AON ANGLE be cut mark it first with a pencil to indicate how far it ~~ should be submerged in the solution. It is then only X WORK BENCH AT necessary to slide the pipe down the guide to the proper AncLe townicu PIPE IS TOBE CUT depth.—J. Petr, Omaha, Nebraska. Pinch Rack Protects Tools From Damage a METS ae fs ee F YOU have a number of tools that are easily damaged a pinch tool support will keep them off the workbench when not in use. The support is made from a length of sheet metal bent over like a book cover and then opened at the end to receive the tools. The sheet metal clip is mounted on a wooden base drilled at each end to receive a pair of clothes pins in the manner shown. With the pinch support tools that are very often mislaid can be always kept in sight. If the builder so desires he can make supports of various sizes to meet his particular requirements. If available, spring brass may be sub- stituted for sheet iron—D. R. Van Horn, Lincoln, Neb. Announcing The MM Workshop Contest Winner structed in my shop at little or no expense. Today my private playground offers amusement for children of ali ages —we have more than 50. W. S$. Vincent. easily within the reach of all parents he suc- ceeded in inducing them to leave their children in his charge, but let his letter tell the story. ERE is the letter which won the $5 Work- ' | H shop Contest prize offered in the July issue . MM Workshon Eito Norova | of MM. This letter, submitted by W. S. Vincent wih An vire, s eene. | cada the parents and | suggested à plan whereby their children would not only be | of Norfolk, Virginia, was considered by the safe, but enjoy themselves as well during school vacation. l judges as the most original. Starting with little To my surprise nearly all were willing to pay $2.50 4 month | or no capital Mr’ Vincent constructed basic tor their aba Abe lace it was worth it, With | e money advanced and my credit | was able to equip the | playground equipment and erected it on a playground with balls, hats, goal posts, teeter boards and | nearby vacant lot. Charging a nominal sum other incidentals. Most of the large equipment was con- | i i | | 114

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the HARLEY- S lang ~N and | Address.. My age is [J 16-19 years, [] 20-30 years, O 31 years and up. (J under 16 years, heck your age group. DAVIDSON Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Pewess= Zs ewes ese eee eB HARLEY-DAVIDSON MOTOR CO., Dept. MM, Milwaukec, Wis. Interested in motorcycling. Send if- lustrated literature. Postage stamp is enclosed to cover mailing cost. I a I [PS 115

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In this department the Photography Editor will answer any question or problem related to cameras of all types, enlarging, printing, developing, taking pictures, and the various phases of home movie making. When sending questions to this department, be sure to include a stamped, addressed envelope in case space does not permit publication of the question and reply on this page. Send all inquiries to the Photography Editor, Modern Mechanix Hobbies & Inventions Magazine, 22 West Putnam Avenue, Greenwich, Connecticut. PROCESSING MOTION PICTURE FILM Since my hobby is taking motion pictures I would like to reverse my own film, but am some- what puzzled as to the apparatus required. I know that there are special solutions for doing this work, but have heard that they can also be reversed by fogging the film during the developing process. Is that correct?—-R. N. It is possible to reverse films by exposing to light after they have been partly developed but this method is very uncertain. In many instances the film will be ruined. The usual method of reversing motion picture film is to develop up the image properly and then re- duce out the silver image by using a special reducer. ‘The unexposed silver salts remaining are then exposed to a white light and the film again de- veloped to secure a posi- tive. PROPER PROCEDURE FOR FILM DEVELOPING Will you please advise the proper time film should re- main in the developer solution for best results? I would also like to know the proper devel- oping time for prints.—C. D. McG. Many of the prepared developers will properly develop film in about five minutes when the temper- ature of the solution is kept at 65°F. By the dark- room tray method. The negatives should be fixed in the hypo bath for about twice the time required to clear them of the white milky appearance. Prints will develop to the proper 116 The top picture shows what happens when a circle swing is photographed at night. This Picture taken with a 2 sec. exposure and £:4.5 stop won $5 for Paul Strisik of Brooklyn, N. Y. This month’s 2nd prize of $3 to J. P. Knipp, Long Beach, Calif., for his dog photo. depth in 45 seconds using the correct de- veloper at 70°F. Follow instructions on de- veloper package, CAUSE FOR FILMS TO FOG Recently I have experienced disappointing re- sults with my home developing work. Fer some reason the film after being developed was very badly fogged. Until now my work has been satis- factory. Can you suggest a possible cause for the trouble?—R, J. K. The trouble about which you inquire was no doubt caused by an unsafe light in the dark-room during the developing process. When developing panchromatic film it is advisable to work with no light at all. On fogged negatives and those which are very flat a printing paper with a very good contrast should be used. The printing exposure should be limitcd to 45 seconds. If the print when developed shows up too dark the exposure should be made less than 45 sec- . onds. The developing so- lution should be kept at 70°F. for best results. TAKING PICTURES WITH COLOR FILTERS How can I take snapshots so as to have them appear that they were taken on a moon- light night?—L. O. V. A simple filter of dark yellow cellophane placed over the lens of your camera will make photos taken just around sunset appear to have been taken in the moonlight.

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FAST ACTION For the Pictures You Want — when you want them HE big fun of picture making is in having a camera that doesn’t need time off. Kodak Six-16 (f.4.5) lets you master every snapshot opportunity. Every hour of the day or night is picture-making time with this mod- ern Kodak. No matter when or where snapshot opportunities arise, you’re set with Kodak Six-16. Action shots . . . scenes . , . close-ups . .. even indoor snapshotsat night, with Kodak ‘“‘SS” Film and Mazda Photo- flood bulbs, are easily within range of this Kodak. Take the restrictions off your snapshot making ... ask your dealer to show you this all-round, fine Kodak. FEATURES: 1/400-second Compur-Rapid shutter with delayed-action timer, Kodak Anastigmat f.4.5 lens, eye-level finder. Makes, 2%x4%-inch pictures, costs $40. KODAK AUTO-FOCUS ENLARGER, MODEL B. The ideal enlarger for home darkrooms— takes negatives up to 4x6 inches, is adaptable to film or plate negatives, enlarges from 11% to 3% diameters. Complete with lens, Photoflood lamp, paper holder, table clamp and set of seven flexible metal masks. Price, $40. Thenk You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers INDOORS AT NIGHT || EVEN IN THE RAIN | The 4-section ` 3 The Compur- lens is a pho- tographic 4 eee @ high-quality, high-speed ond. Delayed- anastigmat ; action timer that ‘makes lets you get under = inthe picture ifficult con- - yourself. The eye-level finder frames the picture accurately in following fast action. When not in use folds flat against cam- Rapid shut- ter has nine speeds, from 1 to 1/400 sec- ;: Metal spools make Kodak Six-16 the smallest roll- film camera for its picture size. No bulky wooden spools take valuable . room. KODAK CATALOG Write today for your copy of the small Kodak catalog, 1936 edition, or get it at your dealer's . . . Eastman Kodak Co., Rochester, N. Y. Na m emae Address—— City. State M. M., 9-36 117

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STAMPS WORTH MANY TIMES WEIGHT IN GOLD LITTLE more than 63 years ago a British lad while looking through a package of old letters came across a one-cent British Guiana stamp which was unlike any he had ever seen before. The small magenta colored stamp, when shown to a local collector, brought the youth three dollars, Shortly after, the collector sold the same stamp to another deal- er for a higher price. This col- lector held the stamp for ten years and when he finally sold it he received about $125 During the next 52 years the stamp passed from one collector to another until the late Arthur Hind of New York purchased it in 1921, for the unheard of sum of approximately $36,000. When Mr. Hind died, the stamp was placed on sale in London, but only after armed guards were posted around the display cabinet as shown in the photo, The stamps at right are equally as rare as the New Guiana issue. ADLETS FOR HOBBYISTS (See regular classified section for rates and other Information.) STAMPS 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 3c to approval applicants. Big illustrated lists included. Kent Stanıp Company, Box §7Z (G. P. O.), Brooklyn, N. Y, UNITED STATES—Elaborate Pricelist free. 45 different 10c. 75 different 30c. Seidenberg, Baroda, Mich. STAMPS sent on approval. Quality at low prices. Herzberg, MM 197, Grantley, Elmhurst, Ill. Fred COINS 50 DIFFERENT Stamps cataloging over $1.00 only a dime to approval applicants. 20,000 different stamps at prices ranging from 1c. All stamps guaranteed genuine. A fine selection of U. $. revenues at lc and up. Address F. G. Stein, Dept. 214, 7360 N. Seeley Ave., Chicago. JUGOSLAVIA TWO SETS COMPLETE; Dominican Re- public, two beautiful sets; Sweden, 1920 complete; Ten Hungary Heads; 23 different Soviet Russia. 66 stamps cataloging $2.33 only 25c. Friendly Filatelists, 3615 N. Sydenham, Philadelphia, Penn, FREE! New illustrated 56-page catalog “United States, British Colonies and Foreign Stamps”—at “real money-saving prices. Includes details E amazing Free Stamp Offers Send postcard for copy. . E. Harris & Co., 156 Transit Building, Boston, Mass, BRITISH TURKISLANDS—Also Congo’s—Montecarlo— Nigercoast—Uganda—Djibouti— Ecuador ‘ian — Ivorycoast — Ubangi—Countries collectors need. Free for 5c postage. EMPIRE STAMP SHOP, Dept. MM., TORONTO, CANADA. $3000.00 EACH for Rare Coins. World’s Highest Prices. Old Cents up to $2000.00 each, 1860 Cent $50.00. Cents of 1861, 1869, 1870, 1881, 1890 $20.00 each, 1859, 1866 to 1875, 1909 $10.00 each, 25c before 1916 $300.00, 50c hefore 1916 $750.00, Lincoln Cents before 1932 $35.00 per 100, Paper Money $26. 00, Foreign Coins, Half Cents, Half Dimes and thousands of others up to $2500.00 each. Send Dime for Large Illustrated List before -ging coins. Romanocoinshop, Dept. 560, Springfield, Mass. $5.00 TO $500.00 EACH paid for Old Coins. money. Get posted. Send 10 cents for Illustrated Coin Value Book, 4x6, Guaranteed Buying and Selling Prices. Coin Exchange, Box 17, Le Roy, N. Y. COMMEMORATIVE $%s. Lincoln, Texas, San Diego, Oregon, $1.50 each, Illustrated Catalogue 25c. Norman Shultz, Salt Lake, Utah. FREE: Foreign Coin, Banknote and Large Illustrated coin catalogue, for 4c postage. Approvals sent. Tatham Coinco, Springfield-9, Mass, We guarantee to pay the Keep all old STAMPS! 100 diff. 3c; 500 diff. 35c; 1,000 dif. 90c! Illustrated Album (4000 spaces) 22c. Approvals sent. Tatham Stamp Co. (D9) Springfield, Mass. FREE! Rare Siberia, Far Eastern Republic valued 35c, Levant Set, interesting Soviet Se Approvals included. “Saxon” Albee Bldg., Brooklyn, N. AIRMAILS—60 Specially Picked, aa triangle and Zeppelin, only $1.00, Ejisenmeier, 3700 Frankford, Balti- more, Maryland. MONTHLY Stamp Magazine one year and 25 foreign stamps. 25c, American Stamp Journal, Cedar Rapids, Iowa, 10 UNUSUAL U. S. Revenues, only 5c to approval appli- cents. Crane Stamp Co., 901 Bedford Bldg., Chicago, Il. FREE!! King George Memorial Packet, 15 varieties. Post- age 3c. Roberts, 901-T Fourth, Baycity, Michigan, 118 OLD MONEY Wanted. $5.00 to $2,500.00 each paid for old coins. Buying catalog 10c. Robert Cohen, Box 483, Muskogee, Okla. COINS, Beadwork, Indian Relics, Minerals, Books, Curios, Stamps. Catalogue, 5c. Indian Museum, Northbranch, Kansas. INDIAN CURIOS 16 ARROWHEADS, Spearhead, Scalpingknife, Gempoint $0.99—120,000 Bargains—Firearms—Photolist 10c. Paul Heikes, Rutland, Illinois. 15 GOOD Indian Arrowheads 50c. Tomahawk bead 50c, Catalog 3c. H. Daniel, Dardanelle, Arkansas, Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Forging spindle bole heads, Foer a Ford spindle bolt through the vari- ous operations of its manufacture and you will spend the better part of a full working day. From the time a piece of rough stock is sheared from a bar until the finished spindle bolt is produced, you will see 33 different operations that will take 5 hours and 44 minutes to com- plete. You will be impressed by the care and precision used in the various forging, machin- ing, grinding and inspection operations, And when that spindle bolt is finished it will be the best spindle bolt that men, money, ma- chines and experience can make, The care taken and the precision used in the manufacture of Ford spindle bolts are typical of that used in the making of all Genuine Ford Parts. Quality materials, expert workmanship, precision machines, careful inspections are im- portant in the making of a vital part such as the spindle upon which your safety depends. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Inspecting spindle balt diameter on visual indicator which has 1000 to 1 magnification — 1/1000 inch looks like 1 inch on scale. FORD MOTOR COMPANY, DEARBORN, MICH. D Hours ana 44 Minutes TO MAKE ONE FORD SPINDLE BOLT! This huge, semi-automatic machine with rotating table performs six machining operations simultaneously. It pays always to demand Genuine Ford Parts! When replacement parts are needed, you can maintain with Genuine Ford Parts the same high standards of quality and performance that were built into your Ford car or your Ford truck at the : factory. ses Ford Spindle Bolt and Bushing Klits contain all necessary parts for completely rebushing the spindles, Included are spindle bolts, bush- ings, thrust bearings, locking pins, nuts, felt washers and retainers. Complete kit eosts less than when parts are purchased separately, Heat-treated spindle bole forgings from continuous ty peelectric furnace, 119

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NEW LIF ACTION POINT OF TOOLS, LOCKS, ETC. LUBRICATES—CLEANS—PREVENTS RUST 25Piece ELECTRICAL EXPERIMENTAL KIT Broadcast over your own radio—make are light 4000 ft. range—secret dotecto- phone, ileten in on private conversationa—generate 110-volt electricity with hand-arlven generatur—build electric stove— Original cost thief detector—generate health raya—electro-plete,etc. 25 pieces St parts genulne commercial apparatus, TOYS—ealvage, bankrupt . and surplus stocke purchased from large concerns, Contains SPECIAL A.C, 110-volt generator—small D.C. motor—excellent micros phone—transformer—test reslatance wire—secret service micro» $ . 9 9 Dhone—gisnt magnet—copper anodes—test corde and clipe—and paoa ether valusble pleces. Weight 16 Ibs. Detailed instructions for 50 fascinating experiments. 1 with sach kit—Short Course In Electricity—Laboratory Bench Plans FREE and Blue Print! Order direct from thls ad or send your name tor = Free Catalog and Booklet ‘°20th Century Electronic Magic.’* ELECTRICAL SALVAGE COMPANY Box 524-MM Lincoln, Nebr. Great opportunity for experts in this amazing new industry. Recent devel- opments in radio make television a certainly NOW. We teach you by our “on the job” method Radio and Tele- vision from beginning to end in our marvelously equipped labs and studio: You actually operate thousands of dollars worth of expensive equipment, You get expert instruction and skilful guidance by radio-television specialists. Demand for Television Experts Television now perfected and ready" for the market N THE NEXT BIG BUYING WAVE. Business leaders predict mew system television will require thou- sands of relay and broadcasting stations. Ultra-short waves will permit eighty thou- sand television stations in America alone. VEN NOW and “bu up” with the world’s next É py : billion-dollar industry. CREE 6MONTHS THOROUGH, PRACTICAL TRAINING Qualifies for vadio-phone ticense (ist Class). Complete up-t minute training on modern” able" television equipment includ: ing the new cathodetay. Practical experience in studio,control room. Transmitter operation of Televis- ion Station W9XAL. Employment ‘FREE BOOK ee ee a ee ee ae ee S.Q. NOEL, Pres. First National Television, Inc. Dept. G-9, Without oungation, send me postpaid FREE Mlustrated Book— Pictures On the Air’, telling about new opportunites in television. Lam 17 years or older. Power & Light Bidg.. Kansas City, Mo. Name. Addi esx 120 A Midget Foot-Powered Locomotive [Continwed from page 101] as indicated in the diagrams so that a realistic ef- fect is produced. The locomotive proper is completed by in- stalling such extras as running boards, end lad- ders and boiler fittings. The safety valve can be duplicated by installing a small tin can on the boiler just behind the steam dome. The steam dome is a tin bucket which has been hammered out on the bottom so as to form a curved surface. A short length of pipe plus an elbow will do nicely as a dummy safety valve. A bell may be picked up in any 10-cent store and mounted on a suitable strap iron bracket. A drum and cable system is employed to steer the locomotive. The steering wheel can be cut from several thicknesses of plywood or a wheel from a discarded pushmobile may be used. Power is supplied to the locomotive either by an auto car motor geared up to the drive wheels or through the use of an axle provided with double crank throws. This is clearly defined in the dia- grams. The tender is built up from an express wagon frame, therefore little explanation is required. To complete the locomotive paint the roof of the cab and the wheels red, the frame, boiler and firebox black and the cab and tender in green. The name of your favorite railroad may be painted on the tender in gold bronze. ‘If desired an auto starter motor powered by several storage batteries con- nected in parallel may be used to power the train. A satisfactory gear or chain drive will of course be required between the motor and axle. It should be noted here that only one rear wheel is connected to this axle. The other remains free so as to prevent the locomotive from skidding when taking corners. By following the diagrams any shopman or boy should have no trouble in producing a train equal or superior to this one. It is surprising what a few extra attachments such as dummy gauges and electric headlight will make. Careful con- struction will result in an unusual toy of which you can well be proud. A Lead Plate Bud Vase (Continued from page 110] rication, rub the lead until it fits the wood tightly. The upright is plated with sheet lead in the same manner as the base. It will he best to touch the seam occasionally with solder, first taking out all slack with the maple stick. Last, solder the seam solid, cut and true with the chisel then solder a small lead disc to the top to complete the lead sheath. ý Bore the hole in the base center for the tenon, coat this with best quality liquid glue and assemble, Place the vase between the lathe centers and turn up the tail stock to make the joint tight. , p Complete the vase by boring a half-inch hole in the top, deep enough to take a test tube. For the final finish, place the vase in the lathe and rub lightly with No. OO steel wool. Flow on clear lacquer with a brush and after it has dried, touch lightly with the finest steel wool to produce a nice luster. A piece of felt glued to the bottom will pres vent the vase from marring furniture. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Wise Men In the inner recesses of Ancient Temples and Tombs ó Cntiquity Preserved This Mysterious Knowledge Do you think that the profound scientists of ancient lands—who knew more about the laws of the universe than the entire world at the time of Newton—do you think that those men were “acci- dents”? Do you believe that the miracles of early days, attested by the writings of scrious men of every ancient people, were mere lies or exaggerations for the amusement of children? Do you think he was talking nonsense, when the greatest philosopher of the ancient world said to his pupils: “Know Thyself”? Isn’t it possible that the transmutation of metals, the clixirs to prolong life, the projection of thought, and the ability to read another’s mind were actually possible to those early sages who recorded and preserved the accumulated wisdom of a thousand generations? The world has long marveled at the secrets of Personal Power possessed by the ancient Sages. Their knowledge was never lost, except to the mass of mankind; it was preserved and used through the ages by those who were qualified to possess it. You can know things, understand things, ac- complish things, you have never before thought possible. You can discover a whole world of new and startling Knowledge, which will stir into ac- tivity inner powers you have never dreamed you possess. Perhaps you have realized that you are not as efficient as your intuition tells you that you should be. Perhaps you have a thirst to know things which the world does not know. Perhaps you sense that with Knowledge comes Power—a Power far beyond your present possi- bilities. Perhaps you have that desire to turn a key and open a door into a mysterious and entrancing New World. The Sealed Book Sent Free Serious people who realize that personal satis- faction and accomplishment can be greatly stimu- lated by knowledge are invited to send for a Free Copy of “The Secret Heritage.” Address: Scribe A.O.W. The ROSICRUCIANS (AMORC) Not a religious organization San Jose California Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 121

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ll i) ITN INH CH UNH í BOOKS SENT FREE on approval, Just mail the coupon and we'llsend you a set of these remarkable auto books, just off the : press. Whether you are a mechanic or helper, Cx- = pert or apprentice, auto owner or driver, if you're interested In knowing all about automobile mechanics, then take advantage of this FREE OFFER. i Nearly 100 pages on DIESEL Engines A better job—in the gigantic auto in- dustry. BIGGEN PAY—a chance to go into business for yourself and get a share of the huge profits are waiting for any man who even half tries te improve himself. Learn auto enginecring with these wonder hooks a new way—without studying ov memorizing. Simply use the JIFFY IN- DEX to look up the answer to any auto problem, Built hy cleven of America’s greatest automobile engineers, and written » oie i CAN YOU FIX IT? These wonder books tell step by step HOW to take out “play? In diferen- tial—to kill the shimmy in. steerIng—to set TIM- ING-how to put your finger Instantly on ens gine trouble and then the quick expert way to FIX it. Newest improvements Lully covered; Equal toa jn simple language so you ean under- less than a fourth the Stand it. Very newest cars, all covered. cost, 6 BIG VOLUMES Brand New Edition 2500 pages, 2000 illus- trations, wirin dla- grams, ete., including Marine Engines, Aviation Motors, Diesel engines, FREE! Send NOW and we will in- clude FREE an extra loose-leaf volume No. 7 with 1936 cars and diagrdms and also that famous book ‘'Automo- bile Service Shop Management." AMERICAN TECHNICAL SOCIETY cte. De Luxe edition, ¥.0 ld-stamped flexible Drexel Avenue & 58th St., Dept. A6320, Chicago, IIT, AMERICAN SOCIETY, Dremel Aue. k SHE St” Dept. A-6320, Chicago, II rexel ve. £ a Dept. A- j hicago, x . I would like to see the new 6-volume edition of your AUTO BOOKS. I will pay the few cents delivery charges only, but if I choose to, I may return them express collect. If after 10 days use I prefer to u $2 and pay the balance ‘at the rate of only is paid. Please inelude free consulting y above. Send brand new 1936 edition. keep them, I will send $3 a month, until $ J membership as per your oll Name -- Address City._-- Attach tet + OCEND: and at least one business man reference. Arprary. Ui Oan Paea RACA CTICAL Primary Leanai i, Ramin o o Eiir REE—if you act now—Kushlan’s HANDBOOK OF INDUSTRIAL ELECTRICITY with the a hro Á Croft Library of Practical ELECTRICITY crnica caitentgs, it is founded sleeve experience—on work as it is actually done. IL is jammed from ae laver with the kind of hard-headed tacts you want. Written so tna hevinner ean easily understand ft, yet so sound, the daily gulde of 59,000 highly pald electric Croft tells you the things you need lo k armatures, commutators, “transformers? ibulion s—electrical machinery o iring of finished buildings—und: i munteipal requir on iNumination In its every phase—the most improved methods of lighting—lamps and Jen 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 und we will send you the entire seven volumes for len days’ Free Examination. We (ake all the assume no obligation. If you decide to Keep the books, send O days anu the balance at the vale of $2.00 a month and t ‘Kushlan’s useful Handhook free, in addition. Send tha coupon YW and see Lbe books for yoursell. FREE EXAMINATION COUPON a McGRAW-HILL BOOK CO., 330 W. 42nd St., New York r ten days’ free examination the Croft Library of vicity. If satisfactory I will send you $1.50 in 10 0 nionthly until the price of $19.50 is paid. If I will return the books postpaid. Upon receipt of my fest payment of $1.50 you are to send me a copy of Kushlan's Handbvok of Industrial Flectricity, absolutely free, Name Regular anual of pr se cons ine first payment for the Croft Library. The Croft Library ls a complete so thorough workers and er Iome Address --.~--.-~-------------- City and State _ Position Name of Company 122 Thank You for Mentioning Modera Mechanix Hobbies and Inventions When Wri The Pre-Fabricated House Arrives [Continued from page 73] customer, at an extra cost of $250 for the change. A similar system is employed by General Houses, Inc., of Chicago, which estimates the yearly upkeep cost of one of its homes at $50. In- terior steel walls may seem a radical departure, but they can be finished in a variety of methods —either by painting, or by the patented method developed by one company in which actual pho- tographic enlargements of wood graining or other effects are mounted on the metal and become a permanent part of it. The use of concrete for house walls is not new, but some of the recent advances are arresting. As long as twenty years ago Thomas A. Edison built a series of experimental concrete houses. He sawed out wooden molds in quantity in a fac- tory, set them up and: poured the walls. Pre-cast concrete panels are also important in the pre-fabrication picture. The Earley Process Corporation of Washington, D. C., is casting re- inforced concrete panels in slabs two inches thick, room height, and varying from two to ten feet in width. One of the most inexpensive pre-fabricated houses is offered by the Steelox Company of Chi- cago, which will sell you two bedrooms, living room, kitchen, bath and storage room for $1,050, and for an additional $300 will provide window shades, kitchen equipment, plumbing and electric fixtures. Wood has not by any means been completely discarded, but its use is greatly modified by modern methods. The United States Forest Products Laboratories at the University of Wis- consin in Madison, Wisconsin, has developed pre- fabricated plywood panels only 13% inches in thickness from which a house can be entirely constructed without use of a frame. Pre-fabrication in wood has enjoyed consid- erable vogue for some time. Forty years ago a young man named Ernest F. Hodgson began the manufacture of pre-fabricated wooden panels for the construction of cottages and garages. For $393 his company will deliver a two-room cot- tage with side porch, and for $1,400 a double-wall cottage with living room, bedroom, kitchen and bath. Strongly appealing to the imagination is the plastic house molded from resins such as form the basis of pipestems and buttons. Such houses are not yet commercially available, but a dem- onstration home has been built to prove the ob- vious advantages of this novel material. The plastic is called Vinylite, and in its natural state is so transparent that it can be used as window glass. Another ingenious pre-fabricated house makes use of airplane principles. This is the cotton house designed by Stanley Nicholson of Milwau- kee. A wood frame is employed and over it is stretched cotton sheeting which is given a coating [Continued on page 129] ug to Advertisers

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Graham M Namee SAYS “I just don’t see how Gillette Blades could possibly be equalled for downright shaving comfort” Gillette Blades 5 for 25* + 10 for 49% Reputable merchants give you what you ask for.In stores where substitution is practiced, insist on Gillette Blades Be the ONE Man in 1000 Who Can Service Modern Sets! Modern circuits stump the old-time cut-and- try radio fixer. More puzziing complications are coming. Trained men with up-to-the-minute radio knowledge are urgently needed to service these new receivers. Such men easily make up to $3 an hour. No Past Experience Needed Past experlence counts for little at this time because changes in radio design ure so swift and radical. That's why you, as an R. T. A. Certified Radio-Teehnician can step right irito the big money at once. Write today for full particulars. RADIO TRAINING ASSOCIATION OF AMERICA Dept. MM-69, 4513 Ravenswood Avenue Chicago, III. EARNS $2.00 to $5.00 AN HOUR I started a radio shop handling alt kinds of radios and electric equipment, Since starting thls shop. I have been able to earn from $2 to $5 an hour, I have built up a good reputation trom sales and serv- Ice work. These satisñed customers have referred their frlends to me and as a re- sult I have all the business I can handle. R.T.A. sure opened my eyes to hig money and I want to thank you for all you have done for me. My income is more than doubled what it was at the time I en- rolled and I expect to earn still more. Ernest Lonctot OF EXTRA COST To start you making money without delay we equip ‘ou with this cirenit Ana- yzer and Polnt to Point Resistance Tester. MAKE GLAZED CONCRETE PRODUCTS NEW MONEY MAKING BUSINESS Make beautiful, colored glaze finishes on concrete pottery, tiles, walls, noveliies. New, perfected, low cost meihod. . Make 2,500 designs of vases, jars, birdbaths, cte., without molds, power or costly tools. Use only sand and cement. No experience decorative waterproofing, pot- tery making. Earn money in your own business, Send 10c TODAY for booklet, color plates and com- plete information. NATIONAL POTTERIES COMPANY 13 West 26th Street, Room 26 Minneapolis, Minnesota Ani Trailer Coupler . Rocky Mt. States West, $2.25, Postpaid Adjustable Bumper Hitch . i This hitch can be put on, taken off, ed to 6 different positions with a wrench. Postpaid, $1.33 without ball. (Rocky Mt. States West $1.50.) Write for catalog on traller hardware E= and camping trallers. ZAGELMEYVER AUTO CAMP CO. 1368 S. Henry St. Bay City, Mich. cut Fuel Costs 257 Finest Automatic Models— Marvelous Performance—Lowest Prices @ Now—Clean, automatic @ This amazingly quiet, Oil Heat without a extra compact LACO necded, Learn glazing, basement! Gets utmost Oil Burner gives the most heat from oil. “Inner Satisfactory, low-cost oil Heating Unit’ with 20°% heating ever known! extra heating surface. de- livers amazing heat. Auto- matic temperature control. New design makes it adaptable for all instal- lations—furnaces, boilers, aiet | Baraiig He Humidifies and cireulates air conditioners. ete. Posi- the air. Built of very An- tively the finest units. for Romes, Stores, oC. est extra-leavy copper- Easy to install, and serv- pasemon bearing steel. Electrically ice, Patented “High Pres- -githont a 5 welded into solid unit. sure Carburetor’’ cuts fuck Handsome as finest furni- bills 25¢¢! DEALERS: ture, 4 sizes. PRICED $100 LESS! S i i . PRICED BELOW OTHERS! orld’s greatest valuel ample burner Seud today tor lus. Why pay more? 40,000 shipped for examina- trated. folder, and very users praise it. Write for tion without oblisation. CED LACO OIL BURNER CO., Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Low ‘Prices! details, today! Write for detalls: 296 Union St., Griswold, lowa 123

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pind ELECTRIC ARC WELDER Works Off Any Storage Battery possible hy the invention of a low volt- age carbon, Auto batteries may be used without removing from ear. Uses about same current as four headlight bulbs. f Broken parts ar aply melted together by the white hot electric arc, in just a few seconds, Produces about; AGENTS 7000 degrees heat, Men with cars to sell mechan- ics, Yepairmen, farmers, radio and battery shops, factories. Five minute Melts iron and steel instantly. Welds fend radiators, holes in bodies, milk cans, tanks, brazes broken cast- ings. Works on anything iron, cl, brass, copper, tin or gal- lemons tuation. vanized metal, Permanent repairs Up _ to 150% made for almost nothing. Wsed prot. Write actories in many opera- ive money back Guarantee i by a responsible firm, A RAILWAY TRAFFIC INSPECTOR, TRAINED MEN NEEDED NOWI A GOOD POSITION is ready for you upon completion of our simple, home-study course. We place you as a Rail- way and Bus Passenger Traffic Inspector with salary up to, e135 per month, to start, plus expenses, or refund n. Interesling, healthful (outdoor) w apid advancement for the ambitions: vel if you like, Free Booklet outlines our year record of placing students. STANDARD BUSINESS TRAINING INSTITUTE: Div. 6109 Buffalo, N. 10,000 Items at Lowest Prices Write for the ble new 1937 ALLIED Radio Catalog—152 pages packed with Everything in Radio, New Metal Tube Radios—4 to 17 tubes—AC, battery, 32 volt. 6 volt and auto sets; dozens of new Set- Builders’ K its; everything in Short Wave Transmitting ` and Receiving equipment; new Public Address systems; also thousands of exact duplicate and replace- ment parts, vadio books, tools and latest test equlpment, FREE PARTS LISTS Write to us for free parts lists covering the Vest Pocket AC; Hitch- Iikors 2-Tube Portable, Musical Derby, 2-in-1 Amplifier, Crystal- dyne Match Box, Portable Sound System, All Star Jr., Thordarson Amplifiers, elc. We can supply matched kits for bullding any Modern Mechanix circuit. J 233 W. JACKSON BLVD. Dept. 6-3 ff CHICAGO, ILL. | O Send me FREE 1937 ALLIED RADIO CATALOG. a | O Send me FREE Parts List for .....sceeseeeeoeee even eee | | Name ..cceccenccveveneenns cnet tener econ sa nnee ners ees eae : | ACAICSS serenaseserereao de ceneeee de eee ence tet inik eoa CItY ne ees State cicceceeeeeee St 1 Inlaying With Colored Sealing Wax [Continued from page 98] carefully to see that no lines have been left uncut and formed into channels, strip off the tracing paper, sponging it with warm water where it sticks. This done, enlarge the outline with a small gouge so inlays may be run in. The next step is that of actually running the shellac into the cuts. Fit the soldering iron with a small size tip and heat slightly. Mahogany shellac was used for all cuts except the birds’ claws and part of the eyes, the white used only for the high lights in the eyes. Melt the proper color of shellac in small quan- tities directly into the channels until filled, wiping off with a clean rag after each color has been inlayed. Coloring the picture is the next step. The water colors are applied to the wood with care to pre- vent an overflow of coloring beyond the shellac filled outline. After coloring has been completed, the project is ready to receive a surface finish. A solution of 1 part white liquid shellac to 7 parts wood al- cohol, used for the first coat, is brushed on with quick light strokes, and left to dry thoroughly. The second and finishing coat of a 1 to 1 solution shellac in wood alcohol is then applied. When this has dried rub down with fine steel wool and apply furniture wax. “MM Metal Tube Master” [Continued from page 113] Any power transformer having a six, five and high voltage winding between 450 and 600 volts may be used with the amplifier. The speaker output transformer should include an extra 500 ohm winding so that additional speakers may be added if desired. The amplifier should be wired up according to the pictorial diagram. Leads should be connected only to the tube socket prongs indicated with the other prongs remaining blank. A 500,000 ohm potentiometer serves as the volume control and is located on the rear of the chassis. The 300 ohm slide resistance is adjusted for best results. Jacks permit either a phono- graph pickup or carbon microphone to be used with the unit. A wooden container large enough to house the amplifier, and covered with black leatherette, completes the work. An opening in the front serves as the baffle board for the speaker. Resistances, except for the 10,000 and 300 ohm sizes, are of the l-watt carbon type. All con- densers, except for the electrolytic 8-8 mfd., are cartridge types and of the highest voltage rating available for the particular sizes used. No external batteries are required for the microphone since it takes all of its power directly from the amplifier. When constructed according to the diagrams, the outfit will deliver sufficient | volume to fill an auditorium seating 1,000 people. 24 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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183 Share $1,000 In Prizes! [Continued from page 35] Omaha, Neb.; Eldon Frye, Bartlesville, Okla.; Nathaniel Smolen, Bronx, N. Y. C.; C. D. Kitchen, Jr., Atlanta, Ga.; Roland J. Sigafoo, Bridgeton, N. J.; Edward C. Gilmore, Holly Hill, 5. C. Seventh prize winners $2 each: Gordon Black, Graymont, Ill; Richard T. Jahant, Akron, Ohio; R. B. Mickey, Highland Park, Mich.; H. T. Con- nelly, Upland, Ind.; Mrs. Rose Renshaw, Ilion, N. Y.; Charles N. Gerard, Woodbury, N. J.; Paul L. Evans, Nelsonville, Ohio; H. Heinrichs, Sellers- ville, Pa. Mrs. Hilda Bartlett, Oakland, Cal.; Wendell W. Page, Delta, Colo.; Fred E. Beaumont, New Bedford, Mass. Mrs. Ivan Selstrom, Wilborn, Mont.; James Howell, Fort Worth, Texas; Ewald Wegman, Gib- sonbury, Ohio; Elizabeth W. Berrey, New Orleans, La.; Andrew Vena, New York City; Dean Frost, Tucson, Ariz.; Derwin E. Moses, Roselle Park, N. J.; Mrs. Mildred M. Danborn, Portland, Me.; Maurice R. Fitch, Lincoln, Neb.; Warren Grimes, Waterloo, Iowa; Marjorie E. Sevin, New Orleans, La.; William H. Meyers, Davenport, Iowa. John N. Hall, Buckhannon, W. Va; George Kirkpatrick, Phila., Pa.; Gruver Davis, Spring- field, Ohio; Herbert G. Jones, Springfield, Mass.; Graddy Cary Richard, Louisville, Ky.; Mitchell C. Dattolo, New Orleans, La.; Dwight R. Jones, Portsmouth, Ohio; Charles O. Greenless, Jr., Davenport, Iowa; James K. Baughman; Gales- burg, Ill.; Louis McNair, St. Louis, Mo. D. L. Brock, Alameda, Cal.; Mrs. Florence Koontz, Moundsville, W. Va.; Clinton W. Haines, Bryant, Wis.; Robert C. Young, San Francisco, Cal.; Jim Eastman, Daytona Beach, Fla.; H. E Wenrich, Berwick, Pa.; Norman F. Walle, Buifalo, N. Y.; D. L. Cheek, Oakland, Cal.; Miss Leila A. Holcombe, Mobile, Ala.; Ray Sanderson, Davison, Mich.; Curtis J. French, Louisville, Ky.; Verle Copeland, Bellingham, Wash.; James Morgan, East Cleveland, Ohio; W. R. Sproles, San Diego, Cal.; Edith E. Dwyer, New Orleans, La.; Veryl F. Saffell, Beech Grove, Ind.; Gerald Damush, Brooklyn, N. Y. Eighth prize winners $1 each: Gus Saclarides, Tarpon Springs, Fla.; Everett E. Linpus, Conners- ville, Ind.; Joseph Schultz, Two Rivers, Wis.; Cecil Rivera, New York City; Edward Slatinka, Buckingham, Iowa; Gilbert V. Cody, El- Monte, Cal.; Tony Nedwack, Chicago, IIL; H. J. Gregory, Portland, Ore.; John Brewer, Mankato, Minn.; M. C. Wallace, Minneapolis, Minn. Maude Henline, Towanda, Ill; Adolf Klarl, Bronx, N. Y. C.; Alfred Hillberry, Houston, Pa.; Marshall A. Riley, Bridger, Mont.; Mrs. Lodie Gass, Detroit, Mich.; Edward H. Reh, Buffalo, N. Y.; W. D. Gregg, Pittsburgh, Pa.; E. L. Coe, Westhope, N. D.; Robert Weiss, Woodside, N. Y.; John F. Konow, Rush Lake, Wis. Alvin C. Wallace, Watertown, N. Y.; Jules M. Gilbert, Cincinnati, Ohio; Mischa Spiegel, Los Angeles, Cal.; Thomas Smith, Fort Smith, Ark.; Victor H. Vincent, St. Louis, Mo.; Joseph Glezen, Jasper, Ind.; T. J. Mayhood, Lashburn, Canada; Marvin Dokken, Hancock, Minn.; L. F. Mayhood, Lashburn, Canada; C. Alvin Kessler, Portland, Ore.; John Hering, Cincinnati, Ohio; C. L. John- son, Glendale, Cal.; Leonard Lyyski, Republic, Mich.: Junior B. Bradford, Bellevue, Ohio; J. P. Coll, Santurce, Porto Rico. L TAKES BRAIN to earn money — trained brain! The man without training is usually the man without cash. You can train your brain! Thousands of men have done it through spare-time study of I.C.S. Courses. Be a cash man—be a trained man — mail this coupon! INTERNATIONAL CORRESPONDENCE SCHOOLS Box 2319-J, Scranton, Penna. Without cost or obligation, please send me a copy of your booklet, “Who Wins and Why,” and full particulars about the subject before which I hare marked X: TECHNICAL AND INDUSTRIAL COURSES D Architect O Plumbing O Architectural Draftsman D Air Conditioning QO Building Estimating D Steam Engineer D Contractor and Builder O Steam Electric Engineer D Structural Draftsman O Marine Engincer O Structural Engineer Civil Engineer D Electrical Engineer D Highway Engineer O Electrice Lighting O Bridge I’ngineer O Welding, Electric and Gas O Reading Shop Blueprints OU Telegraph Engineer O Telephone Work O Heating D Bridge and Building Foreman O Surveying and Mapping D Refrigeration O Radio O R R. Locomotives O Air Brakes O Mechanical Engineer D E. R. Section Foreman O Meckanical Draftsman O R. R. Signalmen O Machinist O Toolmaker O Chemistry O Patternmaker ( Boilermaker O Coal Mining D Sheet Metal Worker DO Navigation O Heat Treatment of Metala D Cotton Manufacturing O Management of Inventions D Woolen Manufacturing O Diesel Engines D Agriculture D Aviation Engines O Fruit Growing O Automobile Mechanic O Poultry Farming BUSINESS TRAINING COURSES D Business Management DO Business Correspondence G Office Management O Lettering Show C: O Industrial Management D Stenography and Typing O Traffic Management O Civil Service Mail Carrier D Accountancy and C.P.A. O Railway Mail Clerk Coaching Oo Bookkeeping O Grade School Subjects O Secretarial Work O High School Subjects O Cost Accountant C College Preparatory O Salesmanship O Advertising O First Year College O Service Station Salesmanship C Illustrating DO Wallpaper Decorating C Cartooning Salesmanship C Lumber Deuler O Pharmacy O Signs D Spanish O French PE E EEE EAA A E A AA N ET E E sessenseseeesere Address.. City... Present Position atutsdessecedens at If you reside in Canada, send this coupon to the International Correspondence Schoole Canadian, Limited, Montreal, Caneda Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 125

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INVENTORS PATENT YOUR IDEAS jiġ SEND FOR FREE BOOK amammp> 5} HOW TO OBTAIN A PATENT written by a Former Member of the Examining Corps (1922-24) of the U. S, Patent Office. If you want to profit by your idea, you should take steps to apply for a U, S. Patent at once. Your first step is to get this Free Book. This interesting illustrated book contains valuable information you should have. It tella you fully how to obtain a patent on your idea in the quickest way, With this Free Book you wlll also receive a “Record of Invention” form on which you can ensily record your iden. Personal and Confidential Service: Your Case will be personally han- dled only by a Hegistered 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. 96B, New York City Miller Bullfding, Dept. 96B, Washington, D. C. Please send me your Free Book, “How to Obtain a Patent,” and “Record of {nventlon’’ form. ADDRESS seses. a | | a E ME ONAME E EA E E E i | | PATENT youn INVENTION through this RESPONSIBLE FIRM ... and Get PROMPT EXPERIENCED ACTION We offer you the experience and proven responsibility of 61 years. Since 1675 we have rendered expert service and counsel to tens of thousands of inventors. Every member of C. A. Snow & Co. who works on your case is a Registered Pateat Attorney, This is important, for only Registered Patent Attorneys may plead your case before the Patent Office. The home of C. A. Snow & Co. is the largest building in Washington occupicd exclusively by one Patent Attorney firm. We offer you thorough, competent work. If you have an invention, we advise immed- Sate action to protect it, for someone etse may be working on the same invention. Write today for our FREE “Certification Of Invention”, which is of real value to you RIGHT NOW! Also two new guides, "How We Protect You” and “Suggestions On How To Commercialize Your Invention”. C. A. SNOW & CO. Patent Attorneys Since 1875 SNOW BLDG. ‘co: WASH, D. C. VALUABLE GUIDES to INVENTORS Checking Car For Engine Noises [Continued from page 93] ing sections are next bolted rigidly together so that the vibration of the motor will not cause them to come loose. It is very important that each cylinder receives its proper quota of vapor so that all pistons will be forced down with a uniform explosion. In order to insure this all valves must be provided with springs of uniform tension. One spring being weaker than the others will result in the motor vibrating excessively. To prevent this, the ten- sion of all valve springs should be tested by com- pressing with a spring balance installed to a jig similar to the one illustrated in the diagrams. When replacing a spring’ that has been broken be sure that it is of the same tension as the others. The nut on the valve stem is adjusted until the proper tension is secured. If valves hiss there is an escape of vapor through the valve guide. To overcome this place a tight fitting felt washer over the guide with a light spring being placed over the stem to hold the washer down. The sealing is completed by packing the counter bore with asbestos-graphite packing. Even though your car burns high test carbon free fuel it is advisable to clean the carbon de- posits from the valves and pistons after each 50,000 miles of driving. If ordinary gasoline is used the valve grinding and carbon cleaning should be attended to sooner. Doing this at the proper time will save you many dollars later on if left go. The last of the many elusive automobile noises is that one caused by grease and dirt entering the housing containing the tork spring and gear. Usually the oil is thrown off by the flywheel while the dirt adheres to the mechanism just as soon as oil is present. To eliminate the tork spring going erratic a small hole is drilled in the top of the housing and plain gasoline squirted into the mechanism. The gas will dissolve the oil and eliminate sudden breaking of starter springs. From the explanation given here it is clear to see that even the most involved automotive troubles can be remedied by the average person if the work is performed in a systematic manner. Auto Triumphs Feature Centennial [Continued from page 61] A notable system of electric lighting and an array of man-made lakes feature the Centennial grounds. A detail of Texas Rangers and the “Rangerettes” add color to the scene. The latter are young women in western garb who are official hostesses and information dispensers. The National Cash Register Exhibit is a giant cash register which rings up the attendance as crowds flock through the turnstiles. Attendance during the first week was 426,625 and officials expect 10,000,000 visitors before closing. 126 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Stunting On A Motorcycle [Continued from page 57] Another stunt is one in which the rider leans backward, extends his feet into the air and lets his head hang down over the back wheel. the right side of the machine, stand on the foot rest with the left foot and grip the handlebars with the left hand. The right side is preferred because the grip on the handle- bar gives the stunter control of the throttle and he slows the machine as desired. The right hand and foot are stretched outward. There are kneeling stunts, such as riding with both knees ón the seat with arms out- flung, and riding the seat with one knee with one leg out. Stunts become more complicated when the rider has a partner. One of the popular double person tricks is one in which the rider takes a position on the seat with one foot and grips the handlebar with one hand, having the other hand and foot flung outward. His partner, generally a woman, takes a sitting position on the front wheel mudguard, braces her feet on the foot plates, and leans back- ward, with her arms outflung, and her head almost touching the spinning wheel. Another trick is for the woman to climb to the top of the rider’s shoulders and take either a sitting or standing position, with her arms stretched upward. After she gets her pesition the rider rises into upright sitting position, letting go of the handlebars. The partner stunt which is breath-taking is the “human leap.” A sturdy board, one which will stand the weight of the machine and rider, is fastened on an obstruction which rises one end from the ground several inches. The partner then lies down on the side oppo- site from which the board extends. The rider takes the cycle at a fast speed up the board and jumps entirely over the woman. Ladder Climbing Tops Stunt List One stunt people will hardly believe is pos- sible is ladder climbing atop a fast moving machine. A ladder, some made of wood and others of metal are used for this stunt. These ladders are fastened by various means, according to the riders choice, in back of the seat. The cycle is speeded to about a 35- mile gate. The rider either climbs the ladder backward or turns around and goes up front- ward, crosses the top and climbs down the other side. He repeats the process, back to the seat again. The ladder is six feet high to the top round. A quiet day must be had for this trick. Wind might mean disaster. Riders who are good at climbing a pole often rig up one just back of the seat and climb to its top. The height varies according to the desire of the rider, but is generally eight feet. Still another is to place both legs to © EVIDENCE A week ago, the same high-grade oil was put in the drained crankcases of two automobiles and each driven about 500 miles. The oil on the right was protected by a genuine Purolator Oil Filter. It is as clean as when it came out of the can...and will even retain its color for thousands of miles. The oil on the left has had no filter protection . . . is tarry looking . . . full of sludge and beginning to accumulate dirt and grit and hard carbon that gets in the oil stream and grinds away at closely fitted moving parts. ; Your car was probably equipped with a genuine Purolator Oil Filter at the factory. If it wasn't, your service station is prepared to supply this protection. But, remember this— THE PUROLATOR MUST BE RE- SERVICED AFTER EVERY 8,000 MILES That is because it becomes so full of the destructive sludge it removes from the oil that its reservoir will hold no more, Your garage man will attend to this in a very few minutes... and no service of his will mean more to you in smooth driving, freedom from repairs, and saving in oil, money and trouble. Motor Improve- ments, Inc., Newark, New Jersey. Makers of PUROLATOR The Oil Filter on Your Motor Car LICENSED UNDER BWEETLAND PATENTS e Important Notice TO OWNERS OF FORD V-8 Passenger Cars or Trucks You can now secure a GENUINE Purolator Oil Filter with all attachments, at a price of $3.25 plus a small charge for installation. Ask your service station. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 127

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Learn Profitable Profession , Salaries of Men and Women in the fascinating pro- à fession of Swedish Massage run aa high as $40 to $70 per week but many prefer to open thelr own of- , ficas, Large incomes from Doctors, hospltala, sani- tarlums, clubs and private patients come to those x who qualify through our training. Reduc- ing alone offers rich rewards for special- ists. Anatomy charts and supplies are à given withour course. Writefor details H Natlonal College of Massage & Physio - Therapy, 20 N. Ashland a Avenue, Dept. 658, Chicago, ilie Concentrate your talents on inventions that will pay BIG MONEY. 1936 Edition of 1800 NEEDED ENTIONS by R. F. Yates tells what inven- tions manufacturers NEED badly. detall 1500 Needed Inventions these fields: General Problems; Automo! 0 ectrical; Me- chanical; Chemical: Avi ns Radio; Marine. Also chapters on the Ten Most Needed Inventions, and on new sclen- tific diseove important to Inventors. Simple, practical ideas—one iden from thls book may win you a fortune. If you want to invent, know what inventions will pay, you the most money. This book tells you, Keeps you from working on inventions 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 5 days’ examination, return it and gct your money back. INVENTORS’ SELLING GUIDE How and where to sell patented or unpatented inven- tions, Inventors’ Selling Guide by R. F. 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 Tux- ers, ete. Tells what an inventer must know about Law, Royalty, Contracts, Patents Pending, Financing, Gyp Schemes, Selling Methods. Cloth bound book, 224 pares. 15 chapters, postpaid $2 (or -0,D. plus postage.) Satisfaction guaranteed., BOTH BOOKS FOR $4.00 if ordered at one time Describes in eee Also: Take Out Your Own Patents, $1.00 Making Unpat- ented Inventions Pay, 50c Write for FREE specimen pages and complete catalog of valuable books for inventors. —— DONLEY PUBL. CO., 509 Fifth Av., Dept. M-9, New York,N.Y. 128 Turning Pottery Projects On Wheel [Continued from page 109] To make good pottery, you must have good clay. Two methods are commonly used. One is called “throwing” and consists of placing a ball of rather soft, thoroughly kneaded clay on the wheel’s center and working it to shape with the hands. To do this calls for an elbow rests, one of which is shown, so that the piece can be kept continually “on center.” This is the fastest and also the most skillful method. The other plan is to use the coil method which was used to build the vase shown in some accompanying photos. For the coil method, the clay should have less water—just dry enough that it will not stick readily to the hands. First a ball about 1% inches in diameter is placed on the wheel. Now turn the switch and with a putty knife work the clay down flat, then cut off the uneven edge leaving a disc about 3%-inch thick and 3% inches in diameter. Small portions of the clay are then rolled out into ropes about 34-inch in diameter as shown. A rolling pin or flat board will help to keep the piece uniform. Wet the clay slightly when making contact to insure bonding. Make the ends well joined by slight kneading. Build up several layers, then start the wheel and with a point or simply your wetted finger, work the outside smooth, then the inside. Then add more layers as the work progresses until finally you will have the com- pleted article. The work must be kept centered. If the clay becomes too moist with frequent wettings, let it stand with a fan blowing against it or play the flame of a blow torch briefly over the area to be slightly dried. Too much heat wiil cause cracking due to uneven drying. Before commencing a project, the plaster pal- ette should be immersed in water until about half saturated. Then when the clay is placed upon it, the soaking of water from the clay into the plaster will cause a tight bond and with reason- able pressure during the molding there will be little danger of the piece slipping loose. Slow setting plaster can also be used in place of clay with satisfactory results. Plaster of Paris sets too rapidly though and cannot be used for regular molding. Plaster pieces which are molded can, after drying, be given a luster by covering inside and out with clear shellac, varnish or lac- quer. Needed Inventions Prize Winners [Continued from page 75] being put through the boiler to remove the salt. The entire unit should be small enough to be packed by horse or stowed away beneath a life boat seat. Almost everyone has experienced the difficulty of working on their automobile motor after night- fall without sufficient light. Pvt. M. W. Paw- lowiez of the 5th Marines, Quantico, Va., found himself in this situation, and determined that a much needed invention was a flood light installed Thank You for Mentioning Modern Mechanix Hobbics and Inventions When Writing to Advertisers

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beneath the motor hood. For this idea Fvt. Pawlowicz wins the third prize of $5. The three fourth prizes of $2 each went to Val Jameson, Wichita, Kansas; Leon Levy, Bronx, New York, and Steven Billcheck, Holli- days Cove, W. Va. Jameson suggests a siren at- tachment for the automobile fan which would remain inaudible while the car was traveling within the speed limits proscribed by law, but would howl with increasing power when the ear exceeded the speed limit. The governor would be on the siren, not on the car. Levy rec- ommends that a means be found for installing a small light within a doorknob so that when the knob is pressed, the keyhole is illuminated. Bill- check would like to see a built-in typewriter re- inker through which the ribbon could pass. The four fifth prizes of $1 each went to Ewing Campbell, .Murfreesboro, Tenn.; Mrs. Don Ross, Grand Rapids, Mich.; Louis La Grange, Allegan, Mich.; and to Donald Backe, Hammond, Ind. Here are the contest rules: 1. In 100 words or less explain your idea for a needed invention. 2. This contest is open to everycne 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. Alt 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. The Pre-Fabricated House Arrives [Continued from page 122] of cellulose dope, as used on airplane wings. Copper has kept pace with the increasing use of metals in home building. Copper Houses, Inc., of New York City, recently erected a copper house at Washington, D. C., which to the eye presents no variation from a conventional home. For the builder who prefers to take only partial advantage of pre-fabrication, a number of alter- natives are available. The Berger Manufacturing Company of Canton, Ohio, markets standardized steel-frame units suitable for the framework of any house regardless of exterior finish. These steel units weigh but 42 pounds and can easily be erected by one man, eliminating the need for heavy erection machinery. The Robertson system of cellular steel units is widely employed for floor and ceiling construc- tion. These units are very much like metal planks two feet wide and four inches thick, made of a single piece of metal pressed into a series of deep square corrugations. Within these corrugations wood sleepers can be dropped and floors nailed to them. One of the principal advantages of the pre- fabricated house is that rooms can be added to it at minimum cost as the family grows. It can also ‘be completely disassembled and set up on a new site at a loss of only 20%. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers at Home Many Finish in 2 Years You can complete thissimplified High School Course as rapidly as your time and abilities permit. Equivalent to resident school work ——prepares you for entrance to college. Stand- ard H. S. texts supplied—Diploma,. Credit for H. S. subjects already completed. Single sub- jectsifdesired. High School education is very important for advancement in business and industry and socially. College Entrance During the past 14 years, our High School graduates have been admitted to 531 different Universities, Colleges, Junior Colleges and Normal Schools—80% of them without entrance examination, Course also prepares for teachers’ certificate and pre-professional examinations. Business—Industry To get and hold a good position in Business today you must be able to write clear, accurate letters and re- ports—do figuring involving Algebra and Geometry— talk intelligently on matters requiring a knowledge of Geography, History, and Economics. In Industty—Mechanical and Engineering lines— you must have at least an elementary knowledge of Physics and Chemistry—hbe able to figure quickly and accurately—know something of Mechanical Drawing and blueprints—and be able to talk and write ac- curately and clearly on both vour work and ordinary topics of conversation. Our High School course meets the preparatory edu- cational requirements for Business and Industry. An Educational Institution The American School was chartered in 1897 as an educational institution, not for profit—and is exempt from paying Federal income tax, like the best resident colleges and universities. Don’t Be Handicapped— Complete Your Training Now Be a High School Graduate! Prepare yourself for promo- tion in Business and Indus- 20 Other Courses try—for the Professions, College Entrance and so- Over 150 noted Educators, En- finegrs.and Business Men cial success. No matter what line you may select, elped prepare our epecial in- struction material High School training will prove invaluable to youl Our moderate fees cover all instruction, standard textbooks and Diploma. Easy monthly terms, Get ahead in life. Start your training NOW! Mail coupon for information about line that interests you American School, Drexel at 58th, Chicago which is used by many resident schoolg and colleges, U, S. Navy, and Province of Manitoba, Canada. We offer you quality training at home for the best- paying lines of Industry and Busineys, as listed in the coupon. American School, Dept. H-628, Drexel at 58th, Chicago Tell me how to train for success in line checked. No obligation, OHigh School Course O| Accounting & Auditing D Diesel Engineering OArchitecture & B’lding ODrafting & Design OAutomotive Engin’ring OLiberal Arts O Business Management OPrivate Secretary OCom'ercial Aeronautics OHi'erAc't's(C.P.A.) g Electrical Engineering QOHighway Engin'r'g O Electrical Refrigerat’'n OQ Mechanical Eng’r’g Air Conditioning ORadio & Television OCivil Engineering OG Salesmanship O Complete Law OSteam Engineering 129

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1 CAN PATCH THIS TOP with PLASTIC WOOD Damaged or leaky tops or rotted posts are repaired by applying Plastic Wood firmly into cracks or holes — allow to harden—sandpaper smooth. Fabric patch can be cemented over Plastic Wood. Make 1001 Household Repairs Genuine Plastic Wood is actual wood in putty form—when dry it is hard wood that can be worked with any wood -working tools—sawed, planed, turned on lathe, carved—will hold nails and screws perfectly without chipping, cracking or crumbling. Adheres to any clean, dry surface—wood, metal, glass or porcelain—is waterproof and weatherproof —can be painted, varnished or lacquered perfectly. Genuine Plastic Wood is also used to repair broken furniture, reset loose bathroom fixtures, loose casters; fill old screw holes, baseboard cracks, shelving cracks, replacing wood rot; fill holes around pipes, wiring, boat and canoe repairs, etc. Get your can or tube at any leading paint, hardware or variety store. BUILD AN AUTO TRAILER Plans in 1935 Handy Man’s Manual Send 50c to Modern Mechanix Publishing Co. Fawcett Bldg., Greenwich, Conn. ELES AL A BROAD, basic intensive course complete in ono school year. Includes fundamentals of Refrigeration, Air-conditioning, Electronics. Approved by educa- 44th year. tors, endorsed by industry. Catalog. ELECTRICAL SCH L We BLISS "5588 299 Takoma Ave., Washington, D. C. ` that is certain; and seldom does it fail. Plastics Change American. Industry [Continued from page 83] producing still newer materials that will make beautiful and inexpensive furniture, automo- bile bodies—even houses? Research is trying, Mean- while, the art of fabricating plastics is advanc- ing steadily. The new automatic injection method of. molding, in which a plastic almost ready to harden is forced under pressure into the molds and can be ejected in a few seconds, a finished product, is a case in point. By this method, too, whole sets of buttons, type- writer keys and other similar objects can be molded at once, instead of laboriously one at a time. í There is no telling what may happen next in this lusty infant industry. Molders now produce plasties in sizes ranging from tiny, jewel-like ear- ring adornments to nine-foot, 4,000-gallon water tanks. The Ford Motor Company uses oil pressed from soy beans in the enamel finishes for its cars; and Ford is now experimenting with a plas- tic made of the soy bean meal, after the oil has been removed, mixed with formaldehyde. It is an exciting technological race; and modern plas- tics—those already in use and those still bubbling in test tubes—may well be the source of a new era of prosperity. : Paint, incidentally, gives a startling example of research’s ability to jolt industry into new channels. Twenty years ago automobiles has- tened through the assembly line only to languish for five weeks in the finishing shop. Today, be- cause of the high development of nitrocellulose lacquers—made from plant fiber—cars are fin- ished from the bare metal to the final polish in one day! That development was a rude awakening to a sleeping paint industry, which was suddenly forced to scrap old equipment and hurriedly re- organize to meet new demands. Plastics have al- ready caused a similar re-gearing of basic in- dustries, and undoubtedly will cause more. Cellulose, which exploded paint theories and makes excellent plastics, is a marvelously versa- tile substance. It goes into the manufacture of such widely separated things as raincoats, ce- ments, substitutes for leather, and the film which makes the modern motion picture possible. Into Cellophane it goes—and in a decade enough Cel- ophane has been manufactured to encircle the earth with a band 200 miles wide. It makes rayon, and a rayon cord as strong as structural steel of the same cross-section promises to double the life of automobile tires. Such things don’t just hap- pen; they are brought about by ceaseless, untiring research. The laboratory has changed rubber from a sticky, ungovernable substance into a tough and sturdy one; it has transformed the tire from a mental and physical hazard into something sel- dom given a thought. Yet in automobiles it is generally the rubber parts that require replace- ment first; chemical tougheners have worked 130 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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wonders, but there is still room for improve- ment. It may seem strange that the Dupont labora- tories, largely instrumental in bringing rubber to its present dependability, should now be en- gaged in perfecting synthetic rubber. Artificial rubber has long been the.ardent dream of many a chemist. Why aim for a substitute when the natural product is so cheap and so much im- proved? The answer is largely an economic one. America gets its rubber from abroad. During the past decade, through foreign manipulation, rubber’s price has gone as high as $1.29 a pound. Chemists saw that challenge. If they could do the impossible—produce synthetic rubber at a reasonable price—they could free the country from its dependence on foreign supply. Research has done just that, using acetylene as a raw material. Dupont chemists, aided by the work of a Notre Dame professor, Father J. A. Nieuwland, have made artificial rubber that ex- cels the natural product in many respects. Called “Duprene,” this substance is already being manu- factured on a commercial scale. An acre of rub- ber trees yields approximately 500 pounds of rubber in 500 years; but an acre-large factory can turn out 200 tons of man-made rubber in five hours! And the raw materials, including sul- phur, salt and natural gas, are well-nigh inex- haustible. Natural rubber’s weakness—its de- terioration from contact with heat, oil, acids and alkaloids, is largely removed in “Duprene.” Though it now costs a $1 a pound, six times the price of rubber, “Duprene” has already found a market in gaskets, tubing, and many other uses where rubber is exposed to chemical decay. To those who remember camphor as a smelly substance applied in treating colds, it may be a surprise to know that camphor is an essential in- gredient in pyroxylin plastics and safety glass. The only source of natural camphor is the Jap- anese island of Formosa. In short, we were long dependent on one small spot on the globe, sub- ject to the vagaries of shipping, tariff, and the possibility of war, for an important product. It is under these circumstances that research works at its best. No time is wasted in devising substitutes for natural products when they are cheap and plentiful. But let there be a threat of scarcity or high price, and immediately all the guns of science are pointed at a synthetic. So it was with camphor. In 1934, after over $3,000,000 had been spent in various laboratories in a vain hunt for artificial camphor, chemists of the New- port Company derived an excellent synthetic from American turpentine. This new synthetic is now helping make the nine million pounds of safety glass the automobile industry will require in 1936. The cunning sandwich of materials that com- pose safety glass is a strange union of man’s new- est with man’s oldest chemical achievement. Glass goes far back into ancient history. Yet the effort expended by plastic research is matched by the [Continued on page 132] If you like to draw, test your sense of design, color, proportion, etc., with our simple Art Ability Test. An opportunity to get a frank opin- ion, free, as to whether your talent is worth developing. Magazines, newspapers, publishers and advertisers spend millions yearly for illustrations. Design and color influence the sale of most things we buy. Artists have become important to industry. Machines can not dis- place them. If you have talent, train it. Drawing may be your surest road to success. The Federal Schools, affiliated with a large art, engraving and printing institution, has trained many young men and women now serving in- dustry as designers or illustrators, capable of earning from $1,000 to $5,000 yearly. Its Homg Study courses in Commercial Art, Illus- trating and Cartooning, contain exclusive illustrated lessons by many famous artists. Practical instruction by experienced men is the reason for its many years’ outstanding success, Courses sold on easy payments. Send today for Art Test and Free Book explaining present opportun- ities in art. Just fill out and mail coupon below. FEDERAL SCHOOLS, Inc. 9066 Federal Schools Bldg. Minneapolis, Minn. Send me, without obligation, your Art Test and Free Book. Name....cssccccsevcccnate seneccvontvessces Addresa...... cence cece neeee coenceeenr eves Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing te Advertisers 131

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IT SURE DOES, IVE WISHED A THOUSAND YOUR DEN LOOKS GREAT, EASY, ONCE YOU GET GOB. DO ON TO T. WHY I'VE DOUBLED MY FUN FROM HUNTING AND HAVE A BEAUTIFUL DEN AND PLENTY OF EXTRA MONEY 6% TO SHOWLTOR IT. we 2a) WE CAN zo a TEACH YOU MOU Send Coupon for Free Book Tells all about Taxidermy, and how you can learn at home tomount)ife-like Birds, Animals, Game-Heads, Fish. Save your valuable trophies. Decorate your home and len. Learn genuine Chrome Tanning for harness and .scle leather, buckskin and fine furs, Mount Common specimens, squirrels, rabbits, owls, even frogs, into marvelous craft-work groups. Doth useful and humorous. Wild-game not necessary. marvelous hobby, great fun and fascination. BIG PROFITS Ton your spare time to cash. Have a e sideline profitable business. Mount game trophies for sportsmen: sell your own mounts} save money and Make Money with expert tanning. Learn by mail from old reliable school, with 200,000 graduates. inves- tigate Todays Send coupon. or letter or post s card Right Now for this marvelous Free Book--no cost— no obligation, State ¢ “your ages 7 Northwestern School of Taxidermy, 4736 Elwood Bidg., Omaha, Neb. Gentlemen:— Please send m ar free 48 P) vage booklet explaining Taxidermy. NEW!! MIDGET POCKET RADIO $2.99 Fostpaia Fits In any small pocket easlly, Weighs only 4 ozs. as shot comes mem eautiful colors (Black, Seen, Brown, White). NO tubes, batieries, or elec- trical connections needed! Nothing to wear or need replacement—willl last for years—only one moving part! Separates and re. ceives brondcast stations with beautiful clear tone. M Range up to 50 miles UCH GREATER under good conditions—very little statie or interfer- ence! Can be used by ANYONE ANYWHERE! NO CRYSTALS TO AD- JUST! Absolutely complete with midget phone and Instructions to use while in bed, hotels, at home, autos, offices, camps, on bicycles or any place you may be, No comnlicated or messy hookups—takes only a fecond to connect! THOUSANDS OF SATISFIED OWNERS. THESE AME FACTS. Send only $1.00 and pay postman $1.09 plus peste e on arrival or send $2.99 (Cash, Money Order, Check). Ideal Gift. uar- anteed. State Color. ORDER NOWI (Foreign orders G5c_ extra TINYTONE RADIO CO., Dept. M-9, KEARNEY, NEBRASK 132 Plastics Change American Industry [Continued from page 131] glass chemist’s constant endeavor to transform his material with new life and new uses. The Corn- ing Glass Works recently completed tests aimed at producing a material long considered impos- sible—a glass that would endure the terrific heat of direct flame on top of kitchen stoves. During these trials, scientists with doctor’s de- gress became cooks. Glass made from 1,500 dif- ferent formulae was tested. To reproduce actual kitchen conditions, these eminent men presided over the frying of 18,000 pounds of potatoes in glassware over many kinds of wood, coal, oil, gas and electric stoves! As a direct result of this ordeal by fire came Pyrex glassware that defies flame and can be used as a serving dish on the table. More that that, laboratory workers cataloged the performance of 1,500 glass formulae, and increased immeasur- ably their knowledge of the product. From the same laboratory has come fibrous glass, spun to a fineness seven to fifty times that of a human hair. A glass wool made up of these fibers resembles cotton batting, and is used ex- tensively as insulation in ships and electric re- frigerators, where vibration causes ordinary in- sulating material to settle. In addition, these su- perfine fibers have been wound around electric wires for insulation with excellent results; and they have been twisted into yarn and woven into textiles! Today we wonder at the marvel of plastics, at the adaptability of glass. Tomorrow may see still a new material, with new advantages. It has been said that the pen is mightier than the sword but the fragile glass test tube bids fair to outrank them both. Training Army Air Fighters [Continued from page 39] of securing a permanent commission in the Air Corps. From the start of training all students think of but a single topic—flying. During the first or sec- ond week in November the all-absorbing topic of conversation is the first solo. Some morning after a particularly rough landing, the instruc- tor clambers out of the ship and says: “Well, you can’t do any worse alone.” The fledgling gulps twice to swallow his thumping heart and gives her the gun. At 400 feet he wiggles the stick a couple of times, tentatively, just to see if the ship recognizes him. A few turns and he glides in to a breathlessly happy landing. The solo is suc- cessfully accomplished! That alone has been sufficient recompense for hours of study and training. If a “washing out” takes place next week, the solo has made it all worthwhile. Although construction of Randolph Field was started in 1928, it was not officially dedicated un- til 1930. The first buildings were occupied by Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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school troops on Oct. 15, 1931, when the Primary Flying School and the School of Aviation Medi- cine from Brooks Field, the Air Corps Training Center Headquarters from Duncan Field, and the Primary Flying School from March Field, Calif., took up permanent residence. The project as it now stands represents a total investment of some $12,000,000 exclusive of aircraft, supplies and equipment. The land, on which stands the most complete and modern air training center in the world, con- sists of 2,368 acres, of which 400 acres in its geo- metric center are confined to the building area. The remaining 2,000 acres, comprising four dis- tinct landing areas, known as the “NORTH,” “EAST,” “SOUTH,” and “WEST” fields, complete- ly surround this central web-like pattern of buildings and streets. Officers Have Own Homes The Administration Building, which houses the photo section, administrative offices, War De- partment theater and the post office is the pre- dominating structure on Randolph Field. It rises to a height of 175 feet and overlooks the surround- ing plain. At night, the beams from a powerful revolving beacon atop the tower can be seen by flyers for a distance of 50 miles. The circular residential area in the center of the great flying field has in its exact center the Officers’ Club. The officers’ homes surround the club, being symmetrically spaced on the concen- tric circular streets and radial spoke-like roads. The majority of the homes are of two-story de- sign, but a number are of the bungalow type. Flanking the administration building at the left of the main double boulevard entrance to the field stands the Post Chapel, a magnificent structure of Spanish design. Just across the main traffic artery is located the Post Exchange. This build- ing consists of three separate wings. One houses the Post Exchange proper, the second is occupied by a grocery store and meat market, and the third by a restaurant and beauty parlor. Flying Cadet Club Organized Forming the boundary on the west and east sides of the building area are eight hangars. Each one measures 220 feet in length, 110 feet in width and is 47 feet high. On the northwest boundary, two large warehouses house the Post Quarter- master and the Air Corps Station Supply. The organization of the new Flying Cadet Club in San Antonio is indicative of the constructive and ceaseless activity towards bettering condi- tions with the Cadet Detachment. It is largely through this effort that the Cadets now find them- selves enjoying club rooms aad privileges which are far superior to those of the recent past. Such is the institution which today receives, trains, educates and transforms into pilots—the youth of America. Young men, who yesterday were no different from thousands of others throughout our Country, upon graduation are the equal of any airplane pilot in the world. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers ‘WHAT KIND OF This man has routine job in shop. Would like to earn more money, advance to better job, but does nothing about it. Will be doing same work 20 years from now. ed This man had job in Z shop. Wanted more pay and better job. Learned Practical Drafting at home from Engineer Dobe. Advanced steadily, increased his earnings considerably, became full-time draftsman, The Road to Advancement AFTING In every walk of life practical training in DRAFTSMAN- SHIP will prove valuable. Even if you don’t accept a job as a DRAFTSMAN, you will be money ahead by taking Engineer Dobe’s Course. You will be amazed at the speed with which you can learn in your own home in your spare time by Engineer Dobe’s PRACTICAL METHO 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 prenare you for better pay in the job you now hare. No High School or previous experience peed ee i a mnst be Rey tated gan my personal train- ing US 3 ENT and until assisted to sition, YOU GET ALL YOUR eee or MONEY BACK. Start NOW W Complete Outfit, and get the training. Prepare i size20x25 in., for more pay and a better furnished job, Send the conpon be- to you. low TODAY! Time is `; 7 moneyl Don’t delay! No obligations! nL EARMEN SSS Given When You Start ENGINEER DOBE, Div.4736 Libertyville, NI. Send me your free book, “Successful Draftsmanship” and ex- a Ll a a a . : plain how you will assist me to a good position as a draftsman. i LJ We : NOE Sis se est Nath oh he a Age... A a, AddTESS ii o eia z k a E E TE a a Post Of Ce-o Stale ra a

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Full Size Prof zional ARC werDeR 292 Efficiency of Arc Welders Selilng for $145.00 and More Offered at Breath- Taking Low Price. Now You Can Own Full Size ELECTRIC ARC WELDER For Per- sonal or Shop Use—or Go Into Welding Business for Yourself! Tlere's thrilling news! A full size, heavy duty Jaddin Electric ARC WELDER— only $29 ‘ot a toy, but a big, 100-pound machine that welds all metals and alloys, every- thing from heavy motor blocks to fenders. A welded-steel-construction machine. yet easily portable on Approved by Automotive Test Laboratories of America. Works from 110-Volt Socket Simply plug into a socket with 110 or 220 Valt AC current, Economical—costs only a few pennies an hour to use. Often pays Jor itself on frst or sec- sturdy, casters. SPOT WELDER $19.75 Complete with all Accessories ond feb Fine for soldering and brazing. Complete he controls. Simple Instructions for doing all kinds welding jobs included. Amazing Details FREE! Send no money! Write today for fasclnating facts about this new Aladdin ARC WELDER at $29.50! At last, machine shops, garages, factories, in- ventors, etc., can oblaln a highly efficlent machine GUAR- ANTEED IN EVERY WAY—at a saving that may amount to several hundred dollars! Send today for free detalls. Lowest priced practical Spot Welder on market! Heavy, full size machine—not a toy—capable of dolng work of machines cost- ing up to $300. Plugs into 110- Volt socket. Welds steel, iron, tin, wire, ete., without flux, acid COMMONWEALTH MFG. CORP. or ‘welding rods. Fully Guaran- teed. Ask for details and specl- 3785 Beechmont, Dept. 3-10 fications—sent FREE. Cincinnati, Ohio Cards, stationery, advertising, labe clrculars, tags, etc. Save money and lime, Sold direct, from factory ouly. Junior Press, $5.99, Job Pre: $11, Power, $149. Do f popular raised printing Hke en- graving with any of our pre Print tor Others. Big Profits Tays for itself in a short time. Ensy rules sent. Write for free catalog of outfits and all details. | The Kelsey Co., K9, Merlden, Conn: LABORATORY APPARATUS BIOLOGICAL SUPPLIES , MICROSCOPES , TELESCOPES CHEMICALS New complete 32 page catalog lists hundreds of items of interest to amateur and professional experls menters. Save Money—buy Direct. Send now! It's FREE and crammed full of bargains and valuable information. J. H. WINN MFG. CO., Dept. 209, 124 W. 23d St., New York ‘OUTDOORS, F REE: This Outdoors Sheath Knife Ideal for hunting, fishing and camping trips. It has a sturdy 4” Dlade, tempered and polished, with keen, durable cutting edge. Blade extends clear thru the bone stag handle. Complete with leather sheath, OUTDOORS is a monthly magazine you will enjoy. Filled with illustrated stories and information on hunting, fishing, camping and outdoor activities. Also Upe w to-the-minute information on guns, fishing tackle, dogs. SPECIAL OFFER We will send you this Sheath Knife and OUTDOORS MAGAZINE for a whole year. Both for only $1.00 Clip this ad and mail today with $1.00 bill to Dept. M Chlcago, Il. TRAILER (> BUILDERS SEND 25c TODAY | 2 BEYERS for this big S0-pawe hook * 0 W N E RS that tells how to bulld Tor $, Beds, Cabinets, ctc. AIl about Electric Light Water Systems, Floor Plans, etc. Pages full of Valuable information, ideas, suggestions that save builders, buyers. and time and money for tralle users. Catalog of parts and cguipment includes everything you want—Axles, Hitches, Pumps, Stoves, Lights, Windows, Sinks, Toilets, Mattressea —over 200 items exclusively for building and equipping a trailer. Rush 25¢ (coin) today—satls- faction positively ree wi is. TRAILER SUPPLY CO. Box 438-C 333 N. Mich. Ave., Wausau, cnroll now for one of the short courses in this rid famous Engineering School. Courses designed to give trade proficiency for earning an immediate income—as a remunerative life work or as @ financial stepping stone, Train- fy) ing given by skilled instructors of the engi- eae neering school, Modern equipment and ees lahoratories, Low tuition and living costs. 4 Write today for complete details, 696 S. College Ave., Angola, Ind. NEED MONEY? Write for free booklet describing *107 Plans for a Operating a Successful Business of Your Own”. Make from $20 to $100 a week starting in spare time at home. No peddling or house-to-house selling. Booklet sent free, and without obligation. Write for $ your copy today. ELITE PUBLISHING CO. 214 Grand St. New York, N. Y. Dept. G NO BOSS! 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. fi 134 BALL BEARING THRUST—-HOLLOW SPINDLES N oO W With features of a high priced lathe. centers (Mod. 360 18 in COMPOUND slide vest—e: Face plate—two No. rocker wedge. accessories—carriage is and cross feeds are equipped wi ith gibs and a series of take up screws. made of one solld piece of cast iron and Is carefully machlned—3 In. four jaw chuck $3.50. 4 In. 35 cents—Shipping weight approx. 31 lbs. express C. O. D Dept. B9, A SCREW FEED METAL CUTTING LATHE Mod. 350—6 in. swing—12 in. between between centers only $10.95). Lathe comp. with riage ACME thread lead screw with ball crank— O MORSE taper centers and standard type tool post with Spindles are hollow—bearings of bronze—Takes all No. 0 Morse DOVETAILED and securely GIBBED to bed—Both top Bed is $4.50. Adapter bushing 50 cents. Ball bearing thrust Send $1.00 with order, balance BALKO ELEC. MOTOR & SUPPLY Co. 10 S. Clinton St. Chicago, III. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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Making Boats Go Faster [Continued from page 49] tons, Miss England’s slightly more than five tons. Miss America X had 6,400 horsepower with four engines, Miss England 5,000 with two engines. Our American motors were developed by a private industrial concern. Such companies are interested in economy and efficiency. But the motors we need to power future Harmsworth hydroplanes need not be efficient nor economical. Our Packards, for example, use between seven and eight hundred gallons of gasoline an hour. The special highoctane gasoline we use costs one dollar a gallon. For any commercial purpose a motor so expensive to operate would be impos- sible to sell. No Subsidies For America’s Boat In the United States the development of super-speed marine engines is strictly a develop- ment by an individual who happens to be myself. No endowments or government subsidies figure in the case. The motors in Miss England III were financed through government endowment. The problem, of course, is not just one of power; it is a problem of power versus weight. Engines that are merely powerful will not suffice. They must be powerful AND LIGHT. It is amazing how an apparently useless com- petition for purely honorary achievement, such as the Harmsworth, often results in substantial commercial benefits. The entire course of an industry is frequently changed by someone’s de- sire to win a race or capture a trophy worth a few dollars at most. Let me tell a story to illustrate: Back in the early days of motorboating, builders of marine engines got themselves into a mental groove. Then the world war brought the development of the high-speed light-weight aviation engine. To me, and to a few other motor- boat enthusiasts, these aviation engines appeared admirably adapted to water craft. Aviation Engine Approved But the “old guard” marine engine makers con- sistently opposed the use of aviation engines in boats. In 1923 I entered one of my Baby Gar run- abouts, in the Carl G. Fisher race. This was a race for “gentlemen’s runabouts,” and the rules speci- fied that the boats should be powered with marine engines. The rules committee barred my entry three successive times after we had won the races. They said the Baby Gar carried an aviation engine. I appealed to the American power-boat asso- ciation for a definition of a marine engine. Their answer was: “any engine manufactured or as- sembled, and sold or offered for sale as a marine engine, is a marine engine.” This gave us a chance to use a Liberty motor we had purchased at junk prices after the war. We rebuilt it, and put it in a Baby Gar Runabout. We advertised the motor for sale as a marine [Continued on page 137] S TURN SPARE HOURS INTO CASH! W40 Weekly InYour Own Ho No soliciting! No canvassing! We show you how to make big Money decorating fast-selling Giftwares. We start you wilh the bis $10 Artist's Qutfit shown above, We supply you with $15 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, Fireside Member says, “I made $100 on furniture in one week.” ¥ Another writes, ‘My sales were $500 for 5 weeks. This is my first year.” R. M. P., of IIL, says, “I did $38.500 worth of business last year and over $12,000 this year.” D. W., New Mexico, reports, "I would not take 31,000 for my Course.” No Experience Needed You too may have a guaranteed income opportunity with Flveside, No tiresome study. You learn by doing. No artistic ability neces- sary. Our easy 3-Step Method makes the work easy to learn and easy to do and fits you to make good 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 And cash buyers for all the Giftwares you can turn out. No Cost Plan Send coupon for details of new plan that pays for your Fireside Course besides putting big cash profits in your pocket. Mail cou- pon now while openings for new members are still being offered. FIRESIDE INDUSTRIES Dept. 142-M Adrian, Fireside Industries Dept. {42-M, Adrian, Mich. | Send me FRED Bock on Ilome Deco- l rating for a big steady income. Also details of plan that will pay for my | l Course and give me big prolits be- l I sides. i | NAME l | apnpness ... i CITY ... Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 135

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Pistol [ELECTRIC EYE 25c Cigarette PHOTO-ELECTRIC CELL Case | wi DOORS FB Ox OPEN was r bass BELLS Pi WINDOWS irean (ANG P7 SHUT a novel Clga- : ratte Cage. | The Electric Eye--Ph otocell--Is one of the latest ecl- Better than the | entific discoverles that has many practical uses. A real thing in | flash of light opens a garage, window, door, turns many an awk- | lichts on or off, stops or starts a motor, etc. Used in ward encounter. Great fun | all television pets. The miracle with a million uses! No “sticking up’’ your friends, | experimenter, no inventor (and who isn't?) should be They squirm and protest. Pull | without this latest scientific novelty. Can also be used the triger andthe slide flies | to amuse and delight people by cresting weird ef- miles of a gtation (or up to 100 miles open, disclosing the çlgarettes. | fects. Lights go off, doors bang, witha flash of light. under good conditions). PRICE 25c ppd. Catalog 100 | Electric Eye, only 25c pest aid. Supersensitive Allyouneed is an aerlal j] ———_—_—————————__ | Electric Eye, better quality, 50 cents postp: é een] © DANCING |ROCKET SHIPS! assembled and wired, with supersengilive eryetal. stand, base, s crystal cup, arm wit! LATEST STEPS, Be popu- tep into theg Oy lar. Good dancersare always future with a sdmired --alweys popular | fast, powerful i é — } guests. Partnera welcome | Rocket Ship. | If you want to become a perfect i caller arn tatione Police SR dancer, learn ta dance At home A . eta. at his new, K . s = , —_—_——_— 2 5 A TELLS: Bee’ w irao oK : rocket planes, rocket care or rocket boats, n end control, improve your dance Complete plana are in ‘book form.|Rockets require only q AP i Și eteps, art of holding, howto walk | @bout an hour to build from inexpensive materials ob- - ents to music, how to lead, latest Fox | tainable at your druggist or chomical supply company. z Trot steps, Natural and Reverse | Will go far at high speeds! Price 10c postpald. A Private Electric Tele- Turns, the Reverse Wave, the | — LINL =A manna A ae ewaȚ a How TAP DANCE rapa Set tor only 15c! 3e it as a practice set or send messages to \ Continental, the f Ki trlonda (sending and NY dance, the Manhattan, the College Why envy the easy rhythm the Code easily and ` D Rhumba, the Cario, Charleston, AN quickly, Be an exe f N iA ing, Price 28 Cents Postpaid > 6 i ing, Price 25 Cents Postnald. s ete. Tap dance in ONLY 6 pert operator. Key, f HOURS by anew, simplified sounder, magnet, z se by Prof. Wilson. No etc, mounted Baar, Boys! course wooden base, I. DOT NW DASH E Festi VAID Wire 2 Say pees Bs ectrician ie 10c THROW YOUR VOICE town Ie tapping. Beat Ada 00 for 04 out a tune with your book, all

complete wlth SSeS Sat Western Union MOns@ toor blanks, code // 24 6% £ and instruce #7, tions, (with- #7, out

a feet. Hostesses love It, t x Friends adore it, Besides, tap ly dancing is not only Invigorating f and entertaining bat is also health-giving exercise for mak- ing the limbs supple and giving a “‘gpringy’’ feeling of fitnesa to the whole Boay. Promotes elimness na- 5) turo’s way, without pills, droga or dieting. Readers say: '. / wonderfal benefit. Thank you for adding tap dancing to my accomplishments,’ z PRICE 25 CENTS POSTPAID. TO VAMP ELECTRIC MOTOR Nl Would yon like to play the 6000 Revolutions p All parts nec- Sinos Ze organ without | per Minute essary for $ going through the drudge- | RUNS “ONLY ery of learning the scales — and keys and without tedi Z $ ous practice? The Vamp- c c ing Tutor is a greatly sim- 2 plified method, which, after a little prac’ enables į A you to play the accompaniment to any tune or song Sc extra written in any ‘‘time'’ or in any ““key.’* No knowl- 5 for pos» edge of music necessary. Once you have mastered the -4 | tage system, you will be able to play the accompaniment to songs, ballads, waltzes, the latest hits, etc., entirely by ear without any music, Price 12 cents postpald. ee TT GoodLuck a I I IM ric Motor for 10c. Sounds almost unbellov- R l N G able but itis perfectly true. We send all the parts A packed in a neat box, with full instructions fo r asaem- The Auto Bomb is =, 5 E å Very striking, quaint ling. No trouble at all butting it together--it la FUN. attached to the > $ and oncommon, Oxidiz- | Takes but a few minutes. d OH BOY! Ian’t it motor of yourcar, ed gunmetal finish; skull | speedy! Runs on a No. 6 or similar dry battery. You one wire to the and crossbonea design; | can learn more about a motor in 80 minutes than by spark plug andthe two brilllant hashing | hours of study, Perform many novel and interesting other Wire to any 4 imitation rubles or em- | experiments with it. Price 10c; postage Sc extra. aaa Seater (BLANK CARTRIDGE PISTOL The instant your er. PRICE 25¢ Postpaid id REVOLVER STYLE 250 Magic Tricks the starter, Ithera ia a shril) whistle tollowed by aloud bang. The driver thinks hig car hag A An excellent little book con taining 250 Parlor Tricks tricks wlth cards, % 4 : ‘7 | Three new handkerchiefs, eggs. yy ‘ models now etc. So aimple “| v out, 25¢,50c

7 Into @ trunk, under the AAN bed oranywhere. Lota of RN8\ IT fun fooling teacher, Re; y £ Yr liceman or friends. The ‘VENTRILO a little instrament, fits inthernonth out ofsight, used with above for Bird Calls, etc. Anyone can nse It, Never falls. A 64. page course on Ventriloquism together with the Ventrilo. All for only 10 cents postp:

JU-JITSU DON’T BE BULLIED The Japanese art of aclf-defense, New methods of attack and de- fanas are given, illustrated so that you cannot fallto understand them, Deals fully with trips, throws, wrist locks, body holds, defense against revolvers, strangling, arm- locks, sclasors, splits, head lock, holding a men down, double knee throw, stick attack defense against knife, one hand throat grip, de- Tense against two assailants, stom- ach throw, secret thumb knockout, nerve pinches, and numerous othe ers. Learn to protect yourself un- der all circumstances with nature’a weapons, Fear no man, guns or knives! **Sclence of Ju Jitsu’? Only 30 cents nostoaid.

exploded. At- me tached in a few = seconds, Doeg not harm the car. More protection than an insurance Size. an perform them. Pro- oo and $1.00. a policy-catches the Ga fusely illustrated. Entertain # | Well madeend eftect- thief in the act. Price 15c each, 3 for 40c. $1.35 and amuse everybody. i Ive, Patterned afier per doz. Shipped by Express. Not Prepaid. Only 10c postpaid. i - | latest type of Revoly-

225 CARD TRICKS, Contains latest and best card Sr nprs ranee cone f « [| tricks. Expnscea card tricks used by gamblers. 25c Takes 22 0al, Blank Cartridges obtain- ff able everywhere. Great protection a- F gainst burglars, tramps, ogs, Have it lying around wlthout the danger at- tached to other revolvers. Fine for 4lh of July, New Year's, stage work, co 2 starting pistol, etc. Small size 25e. Medium size 50c. Large size $1.00. Blank car- tridges 50c per 100, Holster (cowboy type) 60c. Shipped by Express only, not prepaid. SNAPPY JOKES. Big collection compiled by a ba tender for stag parties, smokers, etc. Price 10. e ADDRESS ALL ORDERS FOR GOODS ON THIS PAGE TO JOHNSON SMITH & CO. DEPT. 540, DETROIT, MICHIGAN @ if co yar our NEW CATALOG mailed on recelpt g! Bocor the Des ane ee eee E e Rea o pases ofthe latest MIDGET BIBLE. Size of a postage stamp. Over 200 Only book of Its kind in existence. Nearly GOO pages of the latest ii A] H tricks In magic, the newest novelties, puzzles, games, sporting . BECO. pages. Said to’ bring good luck to owner. 15c, goods, rubber stamps, unusual and interesting books, curlositles in See | Dream Book and Fortune Teller. Tells fortunes. seeds and plants, etc., unprocurable elsewhere. Stamps Accepted. Interprets dreams, gives lucky numbers. Price 10¢c.

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

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Tackle Suggestions For Bass Fishing [Continued from page 65] enamel, six strip construction. The seamed bait rod while it has a considerable sale has practically been superseded by the new seamless tubular rods, the same being drawn from a short length tube of steel, A bait rod in the seamless tubular type answers almost perfectly to the demands set up for an all-around rod to be used for casting all manner of lures and the playing of many vari- ous weights and species of fish. The single action and automatic reels are both used in bass fishing with a bass fly rod. Of the two it is certain that the automatic reel is the best and most efficient. A reel of the sort makes it possible to pay strict heed to the fishing and the activities of the lure without dividing the atten- tion between what is going on with the reel and the destination of the lure. A 50-yard reel is most suitable for bass fishing and like all-around work. A reel of the sort will hold a double tapered HFH line. In making a reel selection for your bass fly rod let it be understood that the balance as be- tween the rod and the reel must be observed if the best results in casting are to be had. Experi- ence with such outfits has taught that the reel with line on it should weigh one and one-half [Continued on page 143] Making Boats Go Faster [Continued from page 135] engine, thus fulfilling the qualifications of the definition. It wasn’t our fault that nobody wanted to buy it. Maybe our price of $25,000 was a little high... . Anyway, the rules committee had to let us in. The race was held in Buffalo, in the summer of 1923. The race committee got something of a shock when Orlin Johnson, my mechanic, and I appeared. We were both in formal attire— top hats, white gloves and all. “What’s the idea?” the Committee wanted to know. “Well,” our answer was, “The rules describe this event as a ‘gentlemen’s runabout race’ and we're taking no chances of being disqualified. Were gentlemen!” The other contenders in the race never got near us. We had a motion picture camera mounted in the stern of the Baby Gar. During the race it ground out pictures of all the other boats until they fell too far behind. That was one of the most satisfying larks I ever had. But the serious point of it is, that after that race, nobody quibbled about the marine and aviation engines. The incident helped to force recognition of a new era in marine motor development. Today the aviation engine and the marine engine (except the small outboards, of course) are becoming funda- mentally the same. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers LET'S DO IT THIS WAY! @The draftsman is one man who doesn’t have to worry about being replaced by a machine. His HRAD and his HANDS are needed — always. Even the smallest improvements must be laid out by the draftsman so he is usu- ally the first man to be hired, and among the last to go in a lay-off. Get into drafting, where the pay is big, the work is fascinating and opportuni- ties lie in EVERY branch of industry. Men from every walk of life enter this profession and thus start their careers toward success and independence. We can help YOU. Let us send you our plan, there is no cost or obligation. Learn at Home Unlike many other professions, drafting is easily learned at home. It requires no previous training, no college education. Just an hour or two'a day right in your own home can do wonders towards making you & drafts- man and fitting you for this interesting, profit- able, inspiring pro+ fession. The American School is proud of ihe success of its students, for American School greduates are found R everywhere in posi- tions of responsibility and power. Bein The American School Bultding, Drexel Ave, at 58th Street. Right now is the time to get imto drafting, for new machines, rc- placements, buildings, bridges, roads, and all other new ventures must be planned on the drafting board before the actual N Ow work can begin. The classified sections of most daily newspapers carry advertisements of joba open for draftsmen NOW. Under our plan of instruction you can often qualify for a good job long before you have completed the course. Thia is important for it enables you to get into this fascinating work within a comparatively short time. Business is building fast, every month more draftsmen will be called for. profession NOW. Text Material All Furnished When you enroll for a course in drafting with the American School you will be impressed with the low cost of this instriction and the easy terms of payment. ‘There are no books to buy, for these are all supplied as a part of the course without one penny of extra cost. Send the coupon for information, there is no cost or obligation. AMERICAN SCHOOL Drexel at 58th St. Dept. DD-628 Chicago, lil. oe ee eee eee eee ee ‘a Join thia American School Drexel at 58th St., Dept. DD-628 Chicago, Illinois Youn may send me, without cost and fully prepaid, details of your course in Drafting and tell me why such wonderful opportunities exist now. 137

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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 August 3rd for the October issue (on sale August 29th). Modern Mechanix, Hobbies & Inventions, 1501 Broadway, Minimum 10 words. Cash must Address Classified Mgr., New York City. A. ©. GENERATORS PRACTICAL changes for automobile gencrators. See our advertisement at bottom of page 21. Autopower, Inc. ADVERTISING AGENCIES LEARN Advertising quickly at home. Easy practical plan. No text books. Common school education sufficient. In- teresting booklet and requirements free. Page-Davis School of Advertising, 3601 Michigan Avenue, Dept. 2044, Chicago. ADVERTISE: Get mail-order business, agents. ree assistance. Free Ad- Guide of newspaper, magazine, circula- tions, rates, mailing-lists. Chicago Ad- vertising Agency, 22 West Jackson, Chicago. ADVERTISE—24 words in 250 news- papers $10. Lists Free. Advertising Service Bureau, 4258B Drexel, Chicago. 30 WORDS, 25 magazines $1.00. Good- all Agency, 230 Bankers Investment Bldg., San Francisco, FREE NEW advertisers rate guide. Brown Advertising Agency, 140 South Dearborn, Chicago. AGENTS WANTED IF YOU want to get groceries and household supplies at wholesale, and a wonderful chance to make $15 a day hesides, send me your name immedi- ately. No experience necessary. New Ford Sedans given to producers. Al- hert à Mills, 2739 Monmouthi; Cincinnati, hio. MEN OR WOMEN Took after local Coftee and Tea Route. Call on homes with 300 highest quality necessities. Spare or full time. No investment. Permanent, Pay starts immediately. right future. Blair Laboratories, Dept. 613-Z, Lynchburg, Virginia. BIG MONEY and Fast Sales. Every owner buys Gold Initials for his auto. Yon charge $1.50; make $1.45. Ten orders daily easy. Write for particu- Jars and free sample. American Mono- gram Company, Dept. 11, East Orange, New Jersey. AGENTS—To call on drug. cigar, candy stores and restaurants, with product yielding handsome all-year- round living. Write information. Safebreath, Dept. K, 863 Pacific St., Brooklyn, N. Y. MAKE More Money Ties, Underwear, Shirts, Dresses, Hosiery, Raincoats, Jackets, Pants, Uniforms. Sales Outfit Free. Nimrod Company, Department 132, 4922-28 Lincoln Ave- nue. Chicago. selling Slide Rule Sextant Speeds Sun Shooting e Automatically solving the spherical triangle this new position finder greatly reduces the chances for error in navigating on land, sea or in the air. AGENTS: Smash go prices! Santos Coffee 12c lb, 100 sticks Chewing Gum 12c. Christmas Cards, 21 in box, 14c. 150 other bargains, Premiums, Car- nation Co., MN, St. Louis, Mo. A BUSINESS of Your Own—Making sparkling chipped glass name plates, numbers, checkerboards, medallions, signs. Illustrated literature mailed free. E. Palmer, 255, Wooster, Ohio. THREE color Roosevelt, Landon, license plate emblems; 25c sellers. Transportation paid cash orders: big profits; prompt shipment. Peegee Sales, 445 Riverside Drive, New York. WISE HOME Worker and Spare Time money makers will send immediately for free details of NEW “SILENT SYSTEM” business. No canvassing. larry Julius, Amarillo, Texas. 1000 BARGAINS, Drygoods, Notions, Drug Sundries, Specialties, Novelties. Agents undersell stores. Free catalog. Jobbers. Dept. 998-A, 504 S. Crawford, Chicago. BIG MONEY applying gold initials on automobiles. Easiest thing today. No ex- perience needed. Free samples. ‘‘Ralco,” 1084 Washington, Boston, Mass. GOOD Income plating Auto Parts, Reflectors, Mirrors, by late method. Free particulars and proofs. Gunmetal Co., Ave A, Decatur, Ill. START Bargain Business. profits. New and used clothing. rupt and auction sale Experience unnecessary, supplied. Publix, Chicago. PROFIT with new products. Make, sell, repeat. Analysis. Research. Guaranteed formulas. Special prices, leads. Biggest catalog free. Gibson. Chemist. CE-1142 Sunnyside, Chicago, WHERE To Buy At Wholesale 500,- 000 articles. Free Directory and other valuable information. Maywood MM. Publishers, 925 Broadway, New York. GOLD Reflecting Letters for store windows. Easily applied. Large sizes, penny each, free samples! Atlas Sign Works, 7941-G Halsted, Chicago. 138 Thank You for Large Bank- merchandise. Everything 568-FG Roosevelt, 500% PROFIT! Gold and colored sign letters for windows, offices, trucks. signs. Monograms. Easily applied. Neonite, Akron, Ohio. NO BOSS! Sure Cash! Silvering Mirrors, Autoparts, Reflectors. Combi- nation outfit. Write, Sprinkle, Plater, 850, Marion, Indiana. AGENTS’ Gold Sign Letters for store windows. 500% profit. Free sample. Metallic Letter Co., 426 N. Clark, Chicago. AMERICAN POLICE JIU JITSU 13 KNOCKOUT blows without fists, by internatiénally known Police Instructor. Send 15 cents, coin or stamps. S. J. Torgensen, 277 Maritime Bhig., Seattle, Washington. | mation pamphlet, AUSTRALIAN OPALS OPALS, Cheap. All sorts. Lists free. Sample Packet, $5.00. Norman Seward, Melbourne, Australia, AUTOMOBILES AUTOMOBILE Racing, third edition gives speed records, drawings, pictures of cars and drivers, full description record cars. Tells how you build 135 mile per hour stock car speedway racers, Midget conversions fully described. $1.00 postpaid. $1.12 C. O. D. Ray Kuns, Dept. 10, Cincinnati, Ohio. “SEMI-DIESELIZING with Cou- trolled Heat." Greatest efficiency, most mileage. Introducing new copyrighted plans 50e. Crippen-Deming Lab, Nor- wood Rd., Jackson, Mich. AUTOMOBILE Owner. Save Money. Use cheap oil instead of gasoline, Plans drawn by Diesel Engineer $1.00 pre- paid. Diesel School, 2929 Atlantic Avenue, Brooklyn. : MIDGET _ gasoline priced. Circular 5c. Rahway, New Jersey. engine popular Anton Bohaboy, AVIATION ARMY AIR CORPS gives free flying training, salary, expenses paid. Infor- 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. FOR SALE—One Pair Wings, Clark-Y 66” chord, 16 ft. long each wing, com- plete with ailerons and control cables. covered, Also tail group to match wings. If you plan on building a ship, it will pay you to write us for more details. Argonaut Aircraft Co., Tona- wanda, N. Y. 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. Tin- coln Flying School, 4002 Aircraft Bldg., Lincoln, Nebr. AEROPLANES, New Production, $98.00. Easy payments. Propellers for aeroplanes, boats, sleds, wind-driven generators, $2.50 up. Send 25c for more information, Hibbs, Fort Worth, Texas. YOUNG men interested in entering aviation under Apprentice Plan write immediately enclosing stamp. Mechanix Universal Aviation Service, Strathmore Station, Dept. C, Detroit. Mich. AVLATION apprentice jobs for inex- perienced workers. Complete list em- ployers and details 20c. Airployment. Box 553. West Ios Angeles. Californ‘a. PROPELLERS -— Ornamental, Price $0.50 up. 4 ft. while they last $1.50. J. B. S. Propeller, Lititz, Pennsylvania. BATTERIES, GENERATORS, ETC. S00 watt 32 volt Dyneto hall bearing generators built for service; no toy; renewed. $18.50. Hurry. M. c Solon, 636 E 3rd St.. Duluth, Minn. USED DODGE 12-volt Generators and Parts Cheap. Particulars dime. C. Mc- Kinney, Box 3172, West Monroe, La. Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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BIG MAILS RECEIVE gigantic mails, magazines, samples. Your name in 1,000 mailing lists 10c. . Fairbanks Maiibureau, 100 Forsyth, New York. BOATS HOW TO BUILD 20 BOATS—The big new edition contains twenty difer- ent up-to-date plans for sailboats, ice- hoats, rowhboats, 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 SPORTSMEN’S MANUAL—The out- doorsman’s guide, containing scores of practical articles by America’s leading outdoor writers, covering cvery phase of fishing, hunting, camping, and trap- ping. This book, edited by Robert Page Lincoln, will make that next vacation a dozen times more enjoyable. Pricc 5fc at your newsstand, or order directly from) Modern Mechanix Publishing Co., Fawcett Bldg.. Greenwich, Conn. BOOKS! BOOKS! BOOKS! Na mat- ter what you want in the book line T can fill your order. If you cannot find the books you want send 25c in silver for my book catalog today. Tevi Bry- ant, 654 Fast 44th Street. Chicago. Hl. FREE—Send for list of new technical hooks at sensational discounts. U. Winn, 124 West 23 St., New York. BURIED TREASURE TREASURE Seekers—Learn scientific methods. Wyss, 104% Francis, St. Tosenh. Mo. BUSINESS OPPORTUNITIES THE PLASTEX Industry needs manu- facturers on small scale and for big pro- duction of Art Goods. Novelties. Souve- nirs, etc, in Plastex and Marble imita- tion. Experience unnecessary. 2c ma- terial makes 25c articles. Rubber moulds furnished for speed production. We place orders and buy goods. Small in- vestment brings big returns. Interest- ing booklet mailed free. Plastex Indus- iries, Dept. R, 1085 Washington Ave., New York. MAKE Artificial Marble. tiles, natural glaze, uncanny. Tabletops, plaques. sanitary flooring, whetstones, Cement secrets, imexpensive. fireproof. Color- ful Tile and Liquid Rubber samples, 3c. John H. Payn, 945 Grande Vista Ave., J.os Angeles, Calif. MEN, learn to become retail store owners. No capital or experience re- quired. $10 training fee, payable $1.00 with application, balance from your store profits. Application dime. Hugh Amidon, Box 293, Elyria, Ohio. WE START you in business, furnish- ing Outfits and Instructions, operating “Specialty Candy Factory” home. Men. women—earn $25.00 to $75.00 weekly. Booklet free. Hillyer Ragsdale, Inc., No, 110, Fast Orange, N. J. IF You Have Some Spare Room, a hase- ment or garage where you can do light work, see our offer to Branch Manu facturers on page 29. Metal Cast Prod- ucts Co., 1696 Boston Road, New York itv. PROFIT with new products. sell, repeat. Analysis. Guaranteed formulas. leads. Biggest catalog free. Gibson, Chemist, CE-1142 Sunnyside, Chicago. FREE marbleizing and flexible mold making instructions. Sample mold and Make. „Research. Special prices, mar bleized cast. Assorted samples. Send dime for mailing service. Cowell Tnstitnte. Grayling, Mich. $8$$ 840.000. -T made it. Plan 10c¢ “Moore-Made,” Lapeer, Mich. Tiny Ship’s Telegraph is Novel Cigar-Cutter Complete in every detail this model of a ship’s telegraph stands less than 4 inches high, It seryes as a combination paper weight and cigamcutter device. EARN More Money Stenciling. Illus- trated instruction book $1.00. Decorate walls, furniture, etc. Free stencils with order. Tisenmeier, 3700M Frankford, Baltimore, Md. SIGNS and Showcards Easily Painted. With Letter Patterns. Large variety of sizes and styles. Samples and Booklet mailed for 3¢ stamp. John Rahn, N2120 Neva, Chicago. SUCCEED With Your Products. Make-Sell them. Learn how. Formuias. Processes. Analyses. Catalogs, cir- culars free. A. Thaxly Co., Washing- ton. D. C. BIG PROFITS operating “route” penny peanut and gum vending machines. Start with $100. Robbins Co., DeKalb Ave., Brooklyn, N. Y. NO BOSS! Sure Cash! Silvering Mirrors, Autoparts, Reflectors, Combi- nation outfit. Write, Sprinkle, Plater, 845, Marion. Indiana. AMATEUR Cartoonists may earn up to $55.00 weekly, copying cartoons for Advertisers. M-Syndicate, Argyle, Wis- consin. GET barrels of money-making mail. Your name in 10,000 Directories, 25c. Roservice, 4627 Glenshade, Cincinnati. SELL by Mail! Books, Novelties! Bar- gains! Big profits! Particulars Free! H. Elfco, 525 South Dearborn, Chicago. PRO$PERITY for home workers, 52 page magazine. Sample, dime., B. Sizemore, 4917 N. Kostner, Chicago. 1146 MAIL Business, Start small, Every- thing furnished. Free details. Metro- mails, M-9, Cincinnati. NEW Hawatian Perfume! Sell By Mail! Free Offer! Henkle Importers, Norwich, Conn. MAIL Order Opportunities. Litera- ture. Silvester & Co., Old Bridge, N, J. Thank You for Mentioutng Modern Mechanix Hobbies and Inventions CAMERAS AND PHOTO SUPPLIES MAKE MONEY in photography. Learn quickly at home. Spare or full time, Easy plan. Previous experience un- necessary. Common school education sufficient. Interesting booklet and re- quirements free, American School of Photography, 3601 Michigan Avenue, Dent, 2044, Chicago. INCOME From your camera instead of expense. Low cost home course teaches you to make photographs for magazines, newspapers, advertisers, Tremendous demand. Earn good money wherever you live. Free book. Universal Photog- yaphers, Dept. A, 10 West 33rd St., New York. : CASI for your photographs. Sell to advertisers. Make your camera pay. Our new copyrighted course gives con- plete details. $1.00. Free circular. Lenox Press, 115A Prospect, East Orange, New Jersey. CARNIVAL GAMES MAKE you money—Outfits supplied, catalog i0c. ‘“Mooremade”’, LaPeer, Michigan. CHARTERS DELAWARE Charters: Complete in- corporating and organizing service $35. Submitted forms. Chas. G. Guyer, Inc., Wilmington, Delaware. CHEMISTRY NEW Photochemical Outfit. 20 differ- ent photochemical actions. Also experi- ments with radioactive minerals, cold light and phosphorescent materials. Make blueprints, luminous pictures. Complete outfit, apparatus, chemicals, instructions, postpaid $2.98. None O. D. G. Ridenowr, Dept. A, 1241 Bensch Št.. Lansing, Mich. SEND 25c for new illustrated chemical Experiment Book with over 300 formu- las and tests. Also receive 32 page illustrated catalog of apparatus, micro- scopes, telescopes and chemicals free. V. Winn, 124 West 23 St., New York. el a enennnlonenaas DETECTIVES BECOME a Successful Detective. Ex- perience unnecessary. Detective Paper and Particulars FREE. National Sys- tem, Box 425-D, Fremont, Nebraska. DETECTIVES—Make Secret Inves- tigations, Experience unnecessary. De- tective particulars free. Write, George Wagner, 2640-V Broadway, N. Y. DUPLICATORS INCREASE Business. ‘“Excellograph” Rotary Stencil, Clay, and Film Duplica- tors $3.85 to $37.50. Prints anything typewritten, penned, drawn, traced. Colors. Folder Free. Pittsburgh Type- writer Supply. Suite 519, Pittsburgh. Pa. DUPLICATOR Set, 9”x12”. Prints material written, drawn, traced or typed. Complete. Postpaid. 750 (Coin or M.O.). Kopy-Quik Duplica- tor Co.. 1531 Walnut. Alameda, Calif. §0c BUILDS Mimeograph, Plans 10c- Bill, 11126 Buckeyei, Cleveland, Ohio. Pen nna EDUCATIONAL AND INSTRUCTION WANTED Immediately, Men-Women, age 18 to 50, qualify for next eligibility test for steady Government Jobs; com- mence $105-$175 month. Common edu- cation, paid vacations, pension. Valu- able information from our Civil Service Expert mailed Free. Write, Instruction Service, Dept. 234, St. Louis, Mo., Today. MIEN Wanted—Iearn Tool & Die Making. Automatic Screw Mach. Machinist Trade. Big Demand. Actual Experience. Expert Supervision. Write for Free Book “M”. Allied Screw Machine Co., Jne., School Div., 603-9 Take St.. Chicago. When Writing to Advertisers 139

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J.EARN To Drive quickly, easily by learning elementary principles. Send for complete, illustrated course, $1.00. Hurry! Limited supply. LIducational Service, 22 Leonard St., Brooklyn, ‘. Y. $105—8175 month, Work for “Uncle Sam”. Men- -women, Try next ex- aminations. J,ist jobs and particulars Free. Write today sure. Franklin Institute, Dept. N73, Rochester, N. Y. BECOME Claim Adjuster, Investiga- tor. Good position or own business. Easily learned. Low cost. Particulars irie S. Y. Morse, 1009 Oak, Elmira, VY, 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, 60-page, wholesale cata- lux. Autopower, 412-B S. Hoyne Ave- nue, Chicago. ENGINES, MOTORS, ETC. NEW A. C. Motors, Grinders, Fans, original factory packing. 10-inch oscil- lating fan, $4.85: 14 H. P. motor $5.80; y, Tf, P. $18.40. Illustrated price list free. Mailorder Electric Co., 1722 So. Michigan, Chicago. 10—14 horsepower General Electric motors 60 cycle, 110 volts, $9.50 each. Buffalo send money order for freight shipment. Krie Electric. 121 Church. WINDING Data, 1000 AC motors, eight leading manufacturers. $1.00. Chas. Chittenden, Jr., Box 7631, Kansas City, Missouri. 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- ae 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 hooks are worth money to the man with a good invention. Ad- dress: Victor J. Evans & Co., Reg- istered Patent Attorneys, 821-K Victor Building, Washington, D. C. INVENTORS-—-Small large commercial possibilities. for FREE hook, Inventor’ ideas may have Write us “Patent Guide for the and “Record of Invention” form. Delays are dangerous in patent matters. Free information on how to proceed. Clarence A. O’Brien and Ilyman Berman. 28-T 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 Inventors, Dept. 5-B, Washington, FREE Information about new maga- zine for inventors who want more. profit from their ideas. Write “Suc- cessful Inventions,” 801 Barrister Bidg.. Washineton, D. C. INVENTORS—Sell your inventions before patenting. Free particulars. Write W, T. Greene, 942 Barrister Building, Washington, D. C. 140 Giant Generators Light New Trains Giant electric generators similar to the one shown here will be used on the fleet of mew "Zepher” streamlined trains now under construction at Phila- delphia. Generators will produce cur- rent for fighting and air conditioning. SMALL inventions wanted by manu- facturers. IM help you sell your iu- vention, S. Hull, 7829 Euclid Avenue, Cleveland. Ohio. FORMULAS SUCCKED With Your Products, Make-Sell them. earn how. Formulas. Processes. Analyses. Catalogs, cir- culars free. A. Thaxly Co., Washing- ton D. C. ANALYSIS. Research. Newest guar- anteed formulas. Biggest catalog free, Special prices, leads. Gibson, Chemist, CE-1142 Sunnyside. Chicago. TESTED collection polishes for all pur- poses 30c, Free list. E, McLaughlan, Box Yonkers, N., Y. FORMULAS—Latest money makers. Literature free. D-Belfort, 4042 N. Keeler, Chicago. ICELESS Ice: Colder! — Cleaner! Cheaper. Instructions, 25c. Duffy-Co., Covington, Ky. FORMULAS—AII kinds. Guaranteed. Catalog Free. Kemico, 67, Parkridge, Tlinois. FOR SALE—CAMERAS, ETC. SEND for Bargaingram; used, new, movie, photographic, sound, silent equip- PROJECTORS, ment, National Film Library, Cata- logue. Mogull’s, 1944-M Boston Road, AN, HOBBIES CHIP Carving, interesting, inexpen- sive. Complete instructions 10c. Bowers, 819 Federal, Los Angeles, California. HYPNOTISM TIVYPNOTIZE Imnstantaneously! Learn how! Instructions 25c. Lonk Institute Hypnotism. D-1313. Palatine, Tlinvix INVENTIONS HAVE you a sound, practical invention for sale, patented or unpatented? Jf so, write Chartered Institute of Ameri- on eter Dept. 5-A, Washington. D. INVENTORS’ Primer answers every question right. Saves you dollars. Copy postpaid $1.00. Adam Fisher Co., 582 Enright. St, Louis, Mo. LAMP INSECT KILLER ELECTRIC Lamp Kills insects indoor or out, $2.75 and up. Literature free. Sauer Brothers, Oakland, Calif. Thank You for Mentioning Modern Mechanix Hobbies and Inventions “RAISE canaries for us. MACHINERY, TOOLS AND SUPPLIES SPRING winders $3.00. Myers Spring Winder Co., 111 Washington St., Bur- lington, Iowa. ——— MAGIC TRICKS & NOVELTIES MAGIC TRICKS, Joke Novelti Puzzles, at lower prices. South's Jar. est line. My famous Catalogue, © aan 1,000 Wonders” and “50 Mysteries Magic” postpaid 10c. Write todas You will be surprised! Lyle Douglas, Station A-14, Dallas, Texas. BE A Handcuff King. We teach you. Escape from handcuffs, boxes, ropes, etc. Secrets of 8 sensational escapes, 25c. Particulars free. Edward Witt, 439 South Broad St., Elizabeth, New Jersey. TALK with your fingers! with friends secretly. Complete chart and instructions sent postpaid 50c (coin). Southwest Novelty Company, P. O. Box 1909, Tucson, Ariz. LEARN MAGIC — Jyarge Illustrated Catalog of tricks. You Can Do, 25c. Holden, 222 West 42nd St., New York. Fun talking MAIL ORDER OFFERINGS 10c BRINGS copy National Mail Order News. Box 1773-MM3, Roanoke, Vir- ginia, MALE HELP WANTED LOCAL AGENTS wanted to wear an | demonstrate Free Suits to friends. No canvassing. Up to $12 in a day easy. Experience unnecessary, Valuable demonstrating equipment, actual samples free. Progress Tailoring, Dept. 1-219, 500 Throop, Chicago. Fascinatiug, pleasurable, spare time money maker. Splendid breeders supplied you. Crim- mins, 3741€ 60th Street, Woodside, New York. MALE INSTRUCTION DETECTIVES. Work home or travel Experience unnecessary. Write, Ameri can Detective Institute, 2640-T Broad- way, N, Y. MIDGET AUTOMOBILES BUILD a Midget Miller Racer. Con- plete plans for constructing this authen- tic midget automobile appear in the new 1936 edition of How-To-Build-It along with many other interesting home and workshop plans. Send 50c for the 148- page book to Modern Mechanix Publ. Ca.. Greenwich, Conn. MIDGET Cars, complete parts for two, for track extra motor and parts $200.00 takes all. A. S. Murray, 104 Donna Ave... Elizabethton. Tenn. MINK RATSE MINK, Send dime for general information. Lomman'’s Fur Farm, Barnesboro, Pa. MISCELLANEOUS TYPEWRITERS, Duplicators, Ad- dressographs. Telescopes. Cameras, Watches, Jewelry. Fully guarauteed. Big bargain lists free. Deel’s Exchange, 1125 Sa. 21st, Manitowoc, Wis. ATTENTION Jig Saw Operators! No drilling, no sawdust, perfect cutting, with new simple method. Information, sample cut 10c. Gene Hubacher, Brad- dock, Pa. EXPERTENCED machinist will take lathe, drill jobs. Single, quantity. $1.00 hr. Fred Short, Cleveland. N. Y. BURIED Treasure Minerals, free book- let. photographs. Fisher, Palmer Bldg., Hollywood. When Writing to Advertisers

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MODEL MAKING FRASY-BUILT 00 GAUGE (%-inch between rails) box and refrigerator enr body construction kits $1.00. Choice of ten cars. Catalogue one dime. Nason Railways, Dept. X9, New Rochelle, New York MODELS & MODEL SUPPLIES 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 Tay enone Pay.” Cresceut Tool Company, Dept. T. Cin- cinnati, Ohio. MONEY MAKING OPPORTUNITIES NEED money? Full or part time work. Either sex. Legitimate tested plans. Not formulas. Complete with instruc- tions, 50c_ postpaid, coin or stamps. Box 156, Oakland, Calif. MOTION PICTURE AND SOUND EQUIPMENT SUPERSPEED Panchromatic 16MM film, 100 ft. $3.75. Other films from $2.19, Bargains in new, used equip- ment. Send for circular. Fotoshop, 13414F West 32nd, New York. LEARN Motion Picture Theatre Busi- ness. JIome Study Training: Manage- meut, Advertising, Projection. Free Catalog. Theatre Institute, 345 Wash- ington, Elmira, N. Y. HIGHEST prices paid for used still- movie equipment. Send description. Fotoshop, 13414F West 32nd, New York. 8MM SPECIALTIES, Dutfaycolor, Panchromatic, Home ‘litling _ Film. Film Specialties, 111 W., El Monte, California. 16 MM FILMS bought, sold, exchanged. Catalogue 10c. Fotoshop, 1344F West 32d, New York. MOTORCYCLES SEND 15¢ FOR 1LLUSTRATED used Motorcycle catalog. Bargains. Largest stock genuine Indian parts and motorcycles. Indian Motorcycle Sales, Kansas City. Mo. RECONDITIONED Motorcycles. New and used parts for all makes. Complete service. Whitman Motorcycle & Supply Co., 405-9 Southwest Blvd., Kansas City. Mo. ALLOY Pistons. Harley, Henderson, Indian, Excelsior. Used parts, catalogue and wings pin 10¢. Ballak, 1115 Chest- nut St., St. Louis, Mo. OFFICE EQUIPMENT TYPEWRITERS, multigraphs, address- ing machines, adders, dictaphones, dup- licators, sealers, folders. Save half, write Pruitt, 553 Pruitt Bldg., Chicago. OLD MONEY WANTED $5.00 to $500.00 EACH paid for Old Coins. Keep all old money. Get posted. Send 10 cents for Illustrated Coin Value Book, 4x6. Guaranteed Buying and Selling Prices. Coin Exchange, Box 18, Le Roy, N. Y. PATENT ATTORNEYS INVENTORS—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-T Adams Building, Washington, D REGISTERED Patent Attorney-Con- sulting Engineer obtains patents and trademark registrations. Write [or confidential advice. Z. Polachek, 1234 Broadway, New York City. Photo Cell Control Designed for Industry Designed for industrial use the photo electric contro! shown here may be used for counting, sorting, alarm sig- nals and other electronic applications. 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 assist- ance; show interesting inventions; illus- trate important mechanical movements. With books we also send Free Evi- dence of Invention form to help estab- lish date of disclosure. Prompt service, reasonable fees, special de- ferred payment plan, Strictest secrecy, Thirty-six years’ experience. Highest references. Write us today. The facts in our books are worth money to the man with a good invention. Ad- dress: Victor J. Evans & Co., Regis- tered Patent Attorneys, $20-K Victor Building, Washington. D. C. INVENTOR’S Universal Educator: contains 900 mechanical movements; 50 perpetual motions; instruction on pro- curing and selling patents and selecting an attorney, ete. Suggests new ideas. Price $1.00 postpaid in U. S. A. Ad- dress Dietrich Co., 511 Colorado Bldg., 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 Guidehook” 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 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-T) Adams Building, Washington, D. C. Thank You for Mentioning Modern Mechanix Hobbies and Inventions PATENT Your Idea—Write immec+ ately for two free books, “Patent Pro- tection” and “When and How to Sci an Invention.” Fully explain many in teresting points to inventors and illus trate important mechanical principles. With books we also send ‘‘Evidence cf 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, 825-K, Victer Building, Washington, D. C. PATENTS. _ Booklet free. Highest references. Dest results. Reasonable fees. Watson E, Coleman, Victor Build- ing, Washington, D, C. INVENTIONS Commercialized, ented or unpatented. Write Fisher Company, 582 Enright, Louis, Mo. INVENTIONS Wanted—Patented, nn- patented. If you have an idea for sale, write Hartley’s Inc., Box 928-J, Ban- gor, Maine. PATENTS—Reasonable Terms, Book ae advice free. J. F. Randolph, Dept. Washington, D. C. | PERSONAL STUTTERING and Stammering cor- rected at home. Booklet free. Paul J. Wolfe, Box 52, Pittsburgh, Penna. PHOTO DEVELOPING FINER Finishing—Rolls developed and printed, colored Enlargement, or twa double professional enlargements, all for 25c (coin). Genuine Nationally Known Moen-Tone Superior Quality. Moen Photo Service, La Crosse, Wis. OIL COLORED ENLARGEMENT or 2 5x7 glossy enlargements with each roll film developed and printed. All for 25e (coin). Badger Studios, La Crosse, Wisconsin. QUALITY Finishing, roll developed and printed 25e. Pocket album free with first order, enlargement coupon. Ideal_ Photo Service, Box 2255, Pater- son, N. J FILMS DEVELOPED—25c coin two 5x7 Enlargements, 8 High Gloss Never Fade Prints. Club Photo Service, La- Crosse, Wis. ROLL DEVELOPED, printed 15¢. Pe- prints Ic. Howard's, 2947 Jarvis, Chicago. PLASTICS MAKE colorful plastics. Formulas ah Carroll, 5253 Brooklyn, Seattle, ash. ~ POEM—SONGWRITERS SEND for Free Copy of Booklet re. eal- ing Secrets of Success{ul Songwriting, free Rhyming Dictionary and market information. you write poems or melodies, Send for Our Offer Today. MMM Pub’s., Dept. MX1, Studio Bldg., Portland, Ore. SONG Ideas Wanted for Radio, Movies, etc. One good song may make your fortune. Write for Free Booklet of professional information for song— poem or melody writers today. Standard Song Service, 1412-E Great Northern Bldg., Chicago. SONGWRITERS—Get all inside facts. Free booklet by famous Broadway com poser. Songwriters Institute, 1234D Broadway, New York. 1 PAY Cash for songs, poems or music. J. W. Earle, Dept. M, Station F. Box 115, New York. SONGWRITERS’ — Poems—Melodies, Snecial offer. Studio MM, Guaranty Bldg., Hollywood. When Writing to Advertisers 141

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Issued in commemoration of the coming Olympic Games to be held in Berlin late this summer this set of unusual German stamps illustrates some of the more popular sports in which the best athletes of the world will compete. The series includes stamps on horsemanship, fencing, javelin throwing, socker ball, swimming, relay running, acrobatics and scull racing, i pS SS PRINTING ITUSINESS CARDS — Best quality; snow white vellum, 2x34. Artistically engraved style. Finest ever. Un- equaled for price. Money back guar- antee. $1.49, 1.000, delivered. Will- cox Art Press (Est. 1899), Hamburg. New Jersey. 1000 STATEMENTS 356x6 $1.50, postpaid (white bond paper). Samples. Frederic Mahon, 231 79th Street, Rock- away Beach, N. Y. 500 WATERMARKED Bond Letter- heads, envelopes $1.75. Illustrations. Anything printed. Bradshaw, 3214-M Huron, Chicago. GUMMED LABELS: 1,000 printed. 1x134, 20 words or less, 50c. JBS Com- pany, Box 93, Holyoke, Mass. 1000 BILLHEADS $2.00. Illustra- tious. Anything printed. Bradshaw, 3214-M Huron, Chicago. RADIO AND TELEGRAPHY RADIO BUILDERS’ MANUAL—A book of radio set building plans and kinks for the home experimenter. Everything from a crystal set to a powerful 6-tube auto radio is included. Price 50 cents—order directly from Modern Mechanix Publishing Co., Fawcett Bldg.. Greenwich, Conn. RADIO Engineering, broadcasting, aviation and police radio, Servicing, Marine and Morse Telegraphy taught thoroughly. All expenses low. Catalog free. Dodge’s Institute, King St., Val- poraiso. Ind CRYSTAL SET—4,250 mile record. Blueprint 18 Distance Models with *“Radiobuilder” year—25c. Labora- tories, 151-K Liberty, San Francisco. RUBBER STAMPS & OFFICE SUPPLIES SEND for New Catalog. McKechnie Brothers, 9F36, Calvin, N. Dak. SALESMEN WANTED SOMETHING NEW in Fire Extin- cuishers—Red Comet Automatics. Proved in West five years. Exclusive territory. Low price opens pocketbooks. Write Red Comet. 409 Comet Building, Littleton, Colorade. 142 SALESMEN, Distributors. We pay higher commission, Exclusive terri- tory. 125 varieties, brushes, mops. Neway Brush Factory, Hartford, Conn, GOLD Reflecting Letters for store windows. Easily applied. Large sizes, penny each. free samples! Atlas Sign Works, 7941-G Halsted, Chicago. SHOOTERS & HANDLOADERS RELOADERS “This Handloading Game” hy Phil Sharpe, just published. Completely covers subject for tyro or expert. Tools, equipment, measures, balances, casting bullets, powders, dies, gauges, chronographs, pressure guns, loading kinks. Price postpaid $1.00. Outdoors, Dept. M, 333 North Michi- gan Ave. Chicago. TI. SPECTROSCOPES SPECTROSCOPE with book of 120 experiments. $2.50. Cudding Sons, Campbell, California. SPORTING GOODS, ETC. HUDSON Bay blankets, Indian pack baskets, camp stoves, knives, compasses, outdoor equipment. Free catalog. Howe Fur Co., Box MM, Coopers Mills, Maine. TATTOOING SUPPLIES AMATEUR Tattooing Outfits, free folder, illustrated catalog 6c. “Tatuco”, 653 South State, Chicago. TATTOOING Outfits, Supplies—Cata- logue. Guaranteed Remover. “Waters,” M-965 Putnam. Detroit. TAXIDERMY SUPPLIES FREE catalogue. Big values direct from official Taxidermic supply mauu- facturer. Eyes. Headforms. Everything. Taxidermic Manufacturers, Memphis, Tenn. TELESCOPES, MICROSCOPES, ETC. GET our lowest prices on Telescopes, Microscopes, Movie Cameras and hun- dreds of other items. Catalog free. WwW. Winn, 124 W. 23 St., New York. TELESCOPES, Microscopes, Binocu- lars. Lowest prices. Optical catalog free. Brownscope Company, 234 Fifth Avenue, New York. Thank You for Mentioning Modern Mechanix Hobbies and Inventions BUILD your own Reflecting Telescope, Copy of instructions ten cents. Cata- log Free. Optical Laboratories, Larch- mont, New York. TRAILERS UTILITY Trailer Plans 25c. Century Products, Box 127, Racine, Wisconsin. WELDING POWERFUL Are-Welder from old Dodge generators. Instructive plans, $1.00. FREE choice of Club Mem- bership or Special Fibre Brush Ring with every order. Welders’ Club of America, 3432 Drake, Chicago. 60 AMPERE, 110 volt Arc Welding Transformer $8.00. 100 ampere, 110- 220 volt, $16.00. Welding supplies. Literature. Arcmaster. 1936 Lyndale, South, Minneapolis, Minnesota. D. C. MOTORS, generators, car gener- ators make welders, chargers, light plants, A. C. generators, ete. 100 Practical Plans, $1.00. Monroe, Box 3343, St. Paul, Minn. ARC WELDER only $29.50. Profes- sional type—110-220 volt. Delivers 110 amperes. Easy to use. Details free. ae Dept. J-14, Cincinnati, 10. ARC-WELDING Outfit $1.25. Weld fenders, braze, solder. Lavrow, 4363-W, Warren, Detroit. Stamp appreciated. OXY-ACETYLENE Welding outfits on easy payment plan. Box 331, Hamilton, O. WIND ELECTRIC LIGHTS ELECTRIC Light-Wind Driven, auto- matic control, build your own electric plant. Copyrighted Blueprints. Write Wind Motor Electric, Brainerd, Min- nesota. WIND ELECTRIC PLANTS BUILD Wiindcharger from old auto- mobile generator. Dime brings complete plans and catalog. Motors, Welders, etc. LeJay Manufacturing, 1414 Lake, Minneapolis, Minnesota. GENERATOR Propellers, expertly de sigued at factory prices. Hibbs, Fort Worth, Texas, When Writing to Advertisers

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Tackle Suggestions For Bass Fishing [Continued from page 137] times that of the rod. Thus if the rod should weigh 5 ounces the reel, to balance properly, should have a weight of 74% ounces. Because automatic reels ean be obtained in these weights, is another point scored in their behalf. Fly rod fishing for bass, having become little short of a national institution, and being practiced everywhere, has brought on a host of lures especially fitted for this rod and method of cast- ing. In this department are found a number of lifelike lures of a small nature, bass bugs with cork bodies, bass flies and flies in combination with a spinner on a shaft. All of these are effec- tive, each type of which has its devotee. Of the two types, the bass bugs and the fly-and- spinner combination are the two outstanding and universally effective ones. Nor should the vari- ous bucktail and squirrel hair flies, as used in small mouth bass fishing, be left out in the cold; or certain feather minnows that sometimes have the effect of bringing forth the finest old bass in the river. Plug Lures Divided Into 3 Classes The lures used in bait casting are, of course, heavier. Mostly they are plug lures that range in weight from 34-ounce on up to an ounce and a half. They are divided into three classes, namely, the underwater minnows that have a weighted body that stays deep in the water; the surface-and-sub-surface lure, which floats when not reeled, but which dips under when set in motion; and the strictly top-water lure, that clings to the surface all of the time. Spinners and metal lures in many varieties have proved effective in bait casting. Bucktail lures that are weighted, and have a spinner with them are especially useful in river fishing. A spinner on a shaft and a frog often proves taking when other lures fail. Wobbling metal lures are ex- ceedingly attractive. The pork-rind lures, in many varieties, belong in a class so prominent and so deadly in taking bass that they simply can- not be left out of the tackle box. Three or four specimens of various rind lures should be in every bass fisherman’s tackle box! Don’t Select Too Light A Line For the casting of fly rod lures with the bass fly rod the enameled (not oiled silk) lines are used. A common failing is the selection of a line that is too light. A heavy line will cast much better, hence a size C or D enameled line will give the best of service. While pork-rind lures and other like attrac- tors, being light in weight, cast with greater ease when handled on a soft braided line, the 18- pound hard braid also does as well. One reason why most fishermen select a hard braid in bass fishing is because all too often in such fishing a possible heavy-weight in the muskellunge or pike division will seize the lure. A durable line is then equal to a capture! Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers Ce DOS WX CATA MAN: fin Doser OR THE N ronsar any FWHO BUILDS HIS OWN Anything and Everything in Radio! Radio Experimenters, Hams and Fans who build their own radio and radio devices will find this carefully com- piled catalog invaluable. It lists thousands of items, sets, parts, tubes, kits, etc.; approved parts so that you can build your own pet circuits, parts for all kits described in this magazine; short wave apparatus; public address equipment and a huge selection of radio merchandise of all kinds . . . all at lowest Wholesale prices. Write for FREE copy today. y o" ” Wholesale Radio Service fj nl ee - Company, Inc., Dept. J-22 i 901 W. Jackson Blvd., Chicago, Il. Rush PREE radio catalog. Name A ng Address ... ff Town , CASH CROP for you every week raising Royal Squab baby birds. Orders now waiting for hundreds of thousands. Easy to raise. You get your money for them when only 25 days old. Send three- cent U. S. stamp for particulars and picture book. PR Company, 602 Howard Street, Melrose, Massachusetts. Reference, any bank, 60 POWER TELESCOPE $2.29 VARIABLE EYEPIECE—20X—40X—60X NEW? Three telescopes in one. 3 different magnifications. 20 power for ultra-bright images with 40 and power for extra long range. Guar- anteed to bring distant objects, people, sports events, ghips, moon, stars, etc., times as close. a j Makes distant obe ects appear right in front of you. Can be „colaps to less than a foot in length. Multiple lens system. 30 m objective in heavy brass mount. Dle 1ections included for using ite a compound 4 lens mleroscope. Amerle can made. We pay the postage: Only $2.29. BROWNSCOPE CO., Dept. 79, 234 Fifth Ave., New York, N. Y. ne. ree Ennion an Service for life. Many jail coupon today for free book which tella yon how d me successfu! io men after tak ing my and etails of my **Pay Tuition After Graduation” Pia H. C. LEWIS, Pres., COYNE RADIO SCHOOL 500 S. Paulina Street.» Dept, 66-1H, Chicago, Ill, Send Free Radio Book and facts, Teir now I can pay for my course on easy payment plan ar 1 graduate. Name Address Ce meee co mereeccrreseeneseeeenereeeresene TOW 400 ADIN PNT ress a ONES Fo oa ky 143

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A aa DIESEL the NEW POWER The whole world gasped at the amazing performance of the Diescl Powered Burlington R. R. Zephyr train. It opens a new era of power efficiency, Aeroplanes, automobiles, great Industrial plants may soon be using these marvelously efficient engines. It means a new profession, a new trade for thousands and thou- sands of men. Learn Diesel operation, construction and repair NOW, Use our magical quick reference method. Find out all you need to know through these books, ‘Diesel and Other Internal Com- bustion Engines’ —'Diesel Engines, Operation and Maintenance’ —Diesel Electric Plants,” which we send free for examination. This combination offer brings yon the latest and most authoritative information obtainable. Over 300 illustrations. 3 BOOKS ALL SHIPPED FREE for examination. There are no strings to this offer, if you really want to get into the most promising new field of the cenlury—the livest—most up-to-date-—most talked of profession, send for these books on our amazing free shipment offer. Itcad them, examine them, test them in any way and then if you are not sold 100% send them buck at our expense and you won't owe one cent. Ceo ee ee | American Technical Society, Dent. 96320, Drexel at 58th Street, Chicago, Illinois. Send me the 3 Volumes on Diesel Engines, listed above for 10 days FREE examination. I will pay the few cents express but don’t owe you a cent, unless I keep the books, in which case I agree to send $2.00 in 10 Gays and $3.00 & month until the introductory price of only $9.80 is patd. Note: If you prefer you may send only $8.80, cash or money order {you save $1.00) in full payment, and we will send the 3 hooks prepaid. We agree to return your money if you are not satisfied and return them in 10 days. Namo kerise eases TIETE TEA AEE I E T E E Address CY seess AETS State riria 7 Please altach a letler giving age, occupallon and the name and address of your employer and that of at least one business man as reference. eee ee esc aeerneate . EDAGE'S CASEIN GLUE A Renk CASEIN GLUE Mrs. M. M. earned $267 in 3 weeks (sworn statement) raising mushrooms for us in her cellar! Exeeptlonal? Yes, but YOUR cellar, shed, barn may be suitable to bring moderate income. Book, pictures sample FREE. (Estab. 1908). UNITED MUSHROOM CO, 3848 Lincoln Ave., Dept. 79 Chicago TRIAL LESSON in Get ready now for new money-making opportunities 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 today. CHICAGO TECHNICAL COLLEGE M268 Tech Bldg., 118 E. 26th St., Chicago, II. Ye" owt DRIVER POWER TOOLS Bulld furniture, toys, novelties in your spare tlme. Make extra money. Tools are casy to operate. You can start a workshop for as little as $10.50. Write Dept. MMS for free 40-page Catalog Walker-Turner Co., tnc., Plainfield, N. J. Whirling Funnels Spread Disaster [Continued from page 54] There is no regularity about visitations of tor- nadoes. Most places have never been known to be hit; but the town of Codell, Kansas, was struck three times in three successive years, 1916, 1917 and 1918, and was close to the beginning of a tornado in 1915. Each time the tornado occurred on May 20 and at almost the same hour of the day. The last time, the town was practically wiped out. People there almost acquired the habit of keeping close to their caves and base- ments when May 20 rolled around, but the town has not been struck since. Chicago has had not less than three tornadoes. St. Louis has experienced two outstanding dis- asters, in 1896 when the loss was $12,000,000, and in 1927, when the loss was twice as great. Omaha, Neb., Louisville, Ky., Minneapolis, Minn. and Philadelphia, Pa., each have been struck twice by tornadoes, at least one of which was quite destructive at each place. St. Joseph, Mo., had four tornadoes in 14 years ending with 1927, while the Kansas Cities have been struck twice. Gainesville, Ga., had been struck twice before by tornadoes; and there were two tornadoes or groups of tornadoes there last April 6—one at 8: 27 a. m. and one ten minutes later. Tornadoes usually travel toward northeast, and most commonly form in the late afternoon; but they have been known to approach from almost every direction, and their paths are often far from straight lines. They may occur at any hour. Conditions that favor tornadoes are warm, “sticky” mornings, especially between March 15 and June 15, over an area located to the southeast of a center of low atmospheric pressure, the familiar “Low” of the weather map. No system has yet been devised for warning communities of the approach of a tornado. As the storm strikes, communication facilities are usually destroyed instantly, and everyone thrown into confusion by an occurrence that is seldom experienced more than once in a life time. Besides, at the time there is little opportunity to ascertain in what direction the storm is moving, and no way of knowing how far it will travel. A few instances are known where warnings have been telephoned to persons nearby as a tornado has moved across open country. One of the safest refuges from a tornado is a storm cave or “cyclone cellar,” common to the dry plains country, where it is used to store fruit and vegetables. Next to this, the basement of a frame house, crouching along the wall on the side from which the storm is approaching, usually the southwest corner, is a popular and safe refuge. The basement of a brick house is to be avoided on account of danger from falling walls; but the first floor of a brick or modern steel reinforced building, close to an inside wall or pillar, is preferable to upper stories. Stay away from windows in such a case, as the air will be filled with flying debris. Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers

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STABLISHING new mileage records on cars in all sec- tions of the country, the Vacu-matic again scores in a new speed record established by Bob McKenzie transcon- tinental automobile champion. Los Angeles to Chicago — 2,322 miles in 39 hours and 42 minutes— driving 75 and 80 to maintain a speed average of 59.7 miles per hour! Here is speed—a gruelling grind—where quick accelaration, greater top speed — and less stops for gasoline mean those precious moments saved that make new speed records possible ‘The same Vacu-matic that helped Bob McKenzie establish this speed record and gave him such fine gas savings is now available for all car owners. It is positively automatic—simple to install—inexpen- sive—and pays for itself many times over in gas savings intsmahé= - - 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 sample 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, 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. Thank You for Mentioning Modern Mechanix Hobbics and Inventions When Writing to Advertisers New Supercharge oe Principle z ; ARYA COC Guaranteed Gas Savings VACU-MATIC must prove itself on every car. It is guaranteed to give worthwhile gas savings, quicker pick-up and more power, or it costs you nothing, “On my V-8 Ford it works miracles”, says Ralph Fields. James Seeley —"On an International Truck on a round trip to Cleve- land, 385 miles, it saved 19 gallons of gas.” A. V. Grove —“On the Buick it showed 5 miles more per gallen.” 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! r = = w#FREE OFFER COUPON @ = = THE VACU-MATIC COMPANY È 7617-233 W. State St., Wauwatosa, Wis. 9 | l Gentlemen: Please send me full particulars concerning the J Vacu-matic and details of your Free Offer. This of course a f does not obligate me in any way. T s ¢ p Name ........ eee eeee eee § Address .......ccccecececcceretsareesenenecesveseoees a Ciy seistaswaisisia esse di6i0i ern eaae SEALE Gye daideoeees O Check here if interested in selling proposition. al weweeew m m Se a m m am m o aa 145

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Kou Veloce Meet Changing Kusinos E A magnifying glass for fine work, a power work feed to keep a constant pressure on heavy work, and a circle cutting table ate new features of this versatile power machine. Work feed has a spring motor; pressure is controlled by a foot pedal. A synthetic resin, produced by chemical reaction, can be used as an adhesive base for plywood, in plastics, dyeing, or as sizing. New uses are sought by the inventor. i A coin and slug sorting device for coin operated vending machines side-tracks slugs before they can reach the mechanism. A rubber impregnated paper is pliable, tough and waterproof. A motor-driven lawn mower, weighing but 95 pounds, has free-wheeling, automatic start and stop, four cutting heights, speed governor, and uses but a gallon of gas a day. A new type sales letter includes en- velope, display advertising, and business reply en- velope on a single sheet of paper. A remote control unit for operating doors, alarms or signal bells, goes into action when a person or car ap- proaches within This new French type phone con- tains coil, condenser and ringer in its streamlined base. No extra witing or desk box is ‘necessary. 146 three feet of its 50 to 100-foot an- tenna. An air conditioner for individual rooms requires no extra plumbing or electrical work. A new pocket knife has blades which open at the push of a button on the grip. This wave trap, tuned by a mov- able magnetic core, prevents tnter- ference from ship-to-shore stations. An intermediate _ frequency transformer furnishes unusual selec- tivity and simplicity in receiver balancing ‘on super-hetrodyne sets. A radically new spot remover has a brush in the container top to simplify cleaning work. A sports shee for soft ball players has detach- able cleats, making the shoe available for other sports. A metal priming paint is water, oil and acid re- sistant and dries in 24 hours. Asphalt shingles, reversible, self-spacing and self-aligning, are now available. A berry picker’s wrist guard also serves as a con- tainer into which berries can be dropped. Anasbestos mitten with woven wool lining withstands terrific tempera- tures. A typewriter eraser consisting of a mineral fiber brush in a molded plastic case quick- ly removes ink from bond or ledger paper. 14-inch can be low-cost electric spot welder. It is designed for home craftsmen, sheet metal shops, service men and school shops. Materials up to welded on this 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 HOBBIES & INVEN- tions, Information Bureau, Fawcett Building, Greenwich, Connecticut. Manufacturers are in- vited to submit material.

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1937 AIR TESTED 5 WAVE BANDS 9 fo 2,200 The Electrik-Saver is today’s most sensational radio feature. It cuts radio wattage consumption as much as 50% ` and results in Midwest 16 and 18-tube radios consuming no more current than an ordinary 7 or 8-tube set. This feature enables the “Air Tested” Midwest to operate on low line voltages—as low as 80 volts! In addition, the Electrik-Saver increases tube life, reduces strain on the set, eliminates repair bills and makes for more consistent and gloriously realistic reception. UP SAVE: 50% DIRECT FROM MIDWEST FACTORY N° middlemen’s profits to pay! Buying direct from the Midwest factory makes your that les you to radio dollar go twice as far. See for your. Midwest offers you greater radio values—e: buy the more economical factory-to-you way that scores of thousands of radio purchasers have preferred since 1920. Never before so much radio for so little money! Why pay more? The broad Midwest Foreign Reception and Money-Back Guarantees insure your satisfaction. You get 30 days F REE trial in your own home! Once again, Midwest demonstrates its leadership by offering the world’s most owerful and most beautiful ALL- WAVE 16-tube, 5-Band Radio. A startling achievement, it makes the whole world your playground. Power- ful Triple-Twin tubes (two tubes in one!) give 18-tube results. This advanced radio is a master achieve- ment, a highly perfected, precisely built, radio-musical instrument that will thrill you with its marvelous super performance... glorious crystal-clear “concert” realism ...and magnificent foreign’ reception. The Dual Audio Program Expander gives a living, vital realistic quality to_voice and musical reproduction. Before you buy, write for the FREE 40-page four color music everywhere. protect $ Warranty. Established 1920 it outperforms ordinary rec You can order your Midwest “Air w 40-page catalog with as much s if you were to come F sf AADIS) [SINCE 1920. 85 ADVANCED 1937 FEATURES This Super DeLuxe Midwest is so powerful, so amazingly selective, so delicately sensitive that it brings in distant foreign stations with full loud speaker volume on channels adjacent to powerful locals: Scores of marvelous Midwest features, many of them exclusive, make it easy to parade the nations of the world before you. You can switch instantly from American programs e. . to Canadian, police, amateur, commercial, airplane and ship broad- casts...to the finest and most fascinating foreign programs. The new Midwest Tuning System, for example, shows you exactly where to tune for foreign stations -.. while Automatic Acrial Adap- tion triples the number of foreign stations that can be secured and & A 1937 wipwest uses ress doubles the excite- catalog CURRENT THAN AN ment and joy , of TODAY. ORDINARY LIGHT BULB short wave tuning. With a Midwest, tl is at your comma: icians, movi finest entertainment the world has to offer It is pref s orchestra leaders, s and de sale because twice as much, radio from the ertainty of satisfaction at factory. (It urself to our g adio purchasers [= CINCINNATI, OHIO, U.S.A. Cable Address MIRACO...All Codes } A 95 SPEAKER (Less tTuses) MY MIDWEST HAS UNEQUALLED BEAUTY OF TONE AND SHARP" NESS OF SELECTIVITY. Glen Gray CONGRATULATIONS FOR CREATING THE MIDWEST. IT BRINGS IN WONDERFUL FOREIGN RECEPTION. Rubinoff MIDWEST RADIO CORPORATION Dept. C-10, Cincinnati, Ohio Without obligation on my part, send me Special offer and prices prevail only when dealing your new FREE catalog and complete details of your liberal 30-day FREE trial offer. This is NOT an order. direct with factory by mail. Name. Address Q Town si SHE sccceareacsh ee

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FACTORY TO YOU NEW REMINGTON NOISELESS PORTABLE € 10t AT LAST! The famous Reming- ton Noiseless Portable that speaks in a whisper is available for only 10¢ a day. Here is your opportu- nity to get areal Remington Noise- less Portable direct from the fac- tory. Equipped with all attachments that make for complete writing equipment. Standard key- board. Automatic ribbon reverse. Variable line spacer and all the conveniences of the finest portable ever built. PLUS the NOISELESS feature. Act now while this special opportunity holds good. Send coupon TODAY for details. YOU DON’T RISK A PENNY We send you the Remington Noiseless Portable direct from the factory with 10 days’ FREE trial. If you are not satisfied, send it back. WE PAY ALL SHIPPING CHARGES, FREE = TYPING COURSE With your New Remington Noiseless Portable we will send you—absolutely FREE—a 19-page course in typing. It teaches the Touch System, used by all expert typists. Itis simply written and completely illustrated. Instructions are as simple as A, B, C. Even a child can easily understand this method. A little study and the average person, child or adult, becomes fascinated. Follow this course during the 10-Day Trial Period we give you with your typewriter and you will wonder why you ever took the trouble to write letters by hand. FREE = CARRYING CASE Also under this new Purchase Plan we willsend you FREE with every Reming- ton Noiseless Portable a special carry- ing ease sturdily built of 8-ply wood. This handsome case is covered with heavy du Pont fabric. The top is removed by one motion, leaving the machine firmly attached to the base. This makes it easy to use your koming” ton anywhere—on knees, in chairs, on trains, Don’t delay. send in the coupon for complete details!

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uble Page Spreads

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INVENTORS NOTE: O BE successful as an in- ventor, you don’t need to be an Edison who took out 1099 Patents before he died, or a C. F. Kettering, who helped develop the Self-Starter, Duco, Ethyl Gas, and other outstanding inventions, and is today the famous head of the Research Division of the General Motors Corporation. In fact, you don’t need to be known as an in- ventor at all, if you. have a prac- tical. useful, salable invention—or an idea for one—and go about it tight. Remember that for every Edison or Kettering, for every McCor- mick, DeForest or Atwater Kent— there have been thousands of un- known men whose inventions helped along the wheels of prog- ress and helped the inventors fi- nancially at the same time. Many Little Ideas Have Big Commercial Possibi tes For example. who knows the name of the ventor of the wooden golf tee, the ordi- nary crinkly hair pin, or the metal ball or disc that the average housewife uses for scouring pots and pans? Who knows the inventors of the thousands of gadgets that you will find in the ten-cent stores, in the modern drug and department stores? Some day, stop and look at some of the simple articles you'll find on the counters of a ten- cent store. Notice how many of them are marked Patented or Patent Applied For. It is au interesting, educational experiment, These inventors, most of them, weren't of the genius class. They simply got an idea for doing something in a better, easier, faster, or more economical way—AND Interesting Points Who Is today's “champion in- ventor!'"? Ans.: John F. O'Connor, of Chicago, Il, holds 940 Patents more than any other living man. Who is “Lady Edison”? Ans.: Miss Beulah Louise Henry of New York City leads all women invento holds fifty patents; is known as ‘Lady Edison”. What is an improvement? Ans.: Nearly all inventions today are improvements over eurller in- ventions, Often the improvement Proves more profltablo than the earlier invention, Is a model necessary? Ans,: Today, most inventions are patented without models, A subject fully explained in our book. What is the preliminary search? Ans.: The preliminary search is ordinarily the first step to help an inventor, Also fully explained in our bool, Send for a copy today. A New Book About Selling Inventions ‘There are two sides to every inventive You may be able to do as well as others who have been successful. That only time can tell, But there is one thing you can do, and do now, without waiting on time. You can find out easily and quickly exactly what to do to protect yourself. In the 48-page book, ‘Patent Protection” shown on the opposite page, which will be sent to you FREE, we tell you what many other in- ventors have done, just what you yourself must do to make Application for a Patent, give you interesting facts about inventive history, show you 115 mechanical move- ments that inventors have used in working out ideas, and much more. Decide now to gct a copy of this interesting book, Its facts can be worth much—yet they cost you nothing. YOUR QUESTIONS ANSWERED! ‘here are 2 * lot of ques- tions that the average man with an invention, or an idea for one, wants answered before he goes ahead, Here are a few of them that most inventors put up to us: How do the Patent Laws protect me? What easy steps can I take, without cost, to put myself in position to sup- port my belief that I am the first man to think of my invention? Is a Patent worth the cost? You may not be an Edison or a Kettering but still you may have a good idea Should I try to sell my invention before I have it Patented? Is there any safe, business-like way to secure financial help? If I do apply for a Patent how shall I reach people who can mar- ket my invention? Can I protect and sell an improvement on some invention that has al- ready been Patented? These are but a few of the questions which usually confront the aver- age man. You need the answers! YOU CAN HAVE THEM, without cost, trouble, or delay, Our Business is To Help You—Write Us Today For more than thirty-seven years, this firm has been helping men with an inventive turn of mind. We maintain a large staff of trained, experienced specialists—Registered Patent Attorneys, Drafts- men, and Searchers to help our clients secure all the Protection to which they are entitled. Fees are reasonable, Deferred payments frequently arranged. Questions promptly answered. Write us frankly with absolute assurance that what you say will he treated with strictest secrecy. But first send for the FREE BOOKS shown on these two pages. They are filled with facts, pictures and suggestions. They tell you things about Patents, Inventions and Selling Inventions that we have learned in our long experi- ence, They may save you time, expense, EVEN LATER DISAPPOINTMENT. Simply fill in the coupon or write us a confidential letter. No charge, no obligation. Mail the coupon today. VICTOR J. success: The inventive side and the com- mercial side, good invention poorly handled, can prove a failure commercially. An ordinary invention, properly handled, can be made a money-maker. In the special booklet, shown here, we give you some sug- gestions on “When and How to Sell an In- vention”; practical hints on the commercial side of inventing. We'll send this new booklet along with the big 48-page book, ‘Patent Protection” illustrated on the next page. Use THEN DID SOMETHING ABOUT IT. the convenient coupon to request your copies. We Cordially Invite You 6 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers VANS £ Co. =m RECISTERED PATENT ATTORNEYS MAIN OFFICE: 720-K, VICTOR BUILDING, WASHINGTON, D. C. 1007-B, Woolworth Blds., New York 1445-B, Monadnock Bldg., Chicago 514B, Empire Bldg., Pittsburgh 1010-B Hobart Bidg., San Francisco 736-B, Security Bldg., Los Angeles Send me FREE copies of your books, “Patent Protection” and “When and How to Sell an Invention.” (Note: Same books sup- plied by any of branch offices listed above.) Other Offices: Name Street and No. .. MAIL THIS COUPON TODAY Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 7 City or Town ....... NI a

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INVEN IDEAS do not have to be complicated to be profitable when Patented. The 5c and 10¢ stores flourish on simple Patented products which are commercially success- ful. The zipper, safety pin, thumb tack, paper clip, collar button—all simple, yet familiar inventions—brought their inventors rich rewards. If you have a Patentable idea—act to protect it. Many of the most useful, widely popular, greatly profitable, and extremely successful inventions have been THAT HAVE ry si x a 7 Z he devi BUILT BUG e: inre ones You have only to loor at the devices we d a utility bought by a hundred thousand or a million people BU 5 | N E 5 5 ES soon after it is produced, Don’t be afraid that the simplicity of your idea 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 invention with only a poor boy’s start is a very long and noble one. Pov- erty, hardships, lack of friends, distance from the market—these could not hold back Bell, Edison, East- man, McCormick, Whitney and others. Everyone cannot succeed. But every man can try. Courage, sacrifice, and hard work may bring you a measure of The Blography of the success these men had. Lack of mechanical ability George Eas r is not a serious draw-back. You can always get Views ot eman who someone able to build a model, draw a detailed design, pied Pateni Proipe or otherwise materialize your idea for you. The big lions and give draw-back is discouragement. perfection to a Your idea for a practical article or an improvement upon an Pew art— Photo- graphy— itself one of the greatest in- ventions. 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 idea. In such a case, the burden of proof rests with the last application filed. Some- times a delay of even a few days in filing the application means the total loss of the patent. LOSE NO TIME. The entire time of this large and experienced organization is devoted exclu- sively to patent and trade-mark cases, We know the rules and requirements of the Patent Office, We understand the technicalities of Patent Law, We can proceed in the quickest and safest ways in preparing an application for a patent covering your idea. CLARENCE A.OBRIEN & HYMAN BERMAN Registered Patent Attorneys Before U. S. Patent Office 317-L ADAMS BUILDING WASHINGTON, D. €. 10 Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers TORS — | tNow TO PROTECT YOUR Ad! IDEAS» WITH A U.5. PATENT Tf you have a new idea that is patentable—and want to secure for yourself your inventor’s sole right to profit from the idea—you can’t afford to lose time in secur- ing the protection of a U. S. Patent. Other inventors may be working on the same idea right now. Should / they develop this idea 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 pos- sible way to secure Patent Protection for your idea. SEND FOR IT TODAY! i TheFIRST IMPORTANT STEP in SE- CURING A PATENT —is to obtain the services of a Registered Patent Attorney, Free Record of The U. S. Patent Office advises that you Invention Form secure the aid of an experienced Regis- Uae Sun FREE “Record g Taven- tered Patent Attorney to prepare your tion form to assist you in record- statements. Establish the date of your Laas aa te cotablich tae aei invention as explained in our book and zonr menton ith it ou can es your idea to hin in seree tom Fouridesand have it wit- Office Records and reports to you on existe Yass oyei as avi ing U. S. Patents which might bear on EETA your invention, giving his opinion on the TEAR OFF advisability of proceeding and filing for- fi adiirability of proceeding g AND ff 317-1 Adams Building MAIL x WASHINGTON, D. C. REASONABLE FEES - CONVENIENT NOW ? Q Please send me at once your Big Free 48- R Page Book, “Patent Guide for the Inventor” @ CLARENCE A. O'BRIEN @ AND HYMAN BERMAN Registered Patent Attorneys ’ a and your Specially Prepared “Record of TERMS, Don't worry about finances. Se Invention” form. Also George Eastman Our fees are very reasonable—we can ra Biography, “Inventor and Business Man,” É This request does not obligate me. arrange convenient terms of payment. e Tt is our custóm to permit clients to pay for our services in installments as the application progresses in our office. See our Big Book for fees in obtaining Pat- ent. It explains our arrangements clearly. Send for it NOW! (Please write or print plainly) Thank You for Mentioning Modern Mechanix Hobbies and Inventions When Writing to Advertisers 11

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Kondor tjes- piony tee Here are the three prize-winners in this month’s Workbench contest. Above are Baby Patches ond Patches II, built from plans for Tarbaby and Dorothy re- spectively by Richard Glenn, winner of the £5 first prize. At top, right is the Bungalow Camp Trailer and Kyack built from MM plans by Walter Buck, second prize winner. in the circle is Tom Gunderson with his Handy Henry tractor. Tom is winner of third prize. S WAS predicted in the Workbench last month, this summer is finding more activity among MM readers than ever before. With the home workshop waiting, and good plans to work from, the hot summer days seem to be acting as an inspiration rather than a deterrent in getting projects completed. The letters from our readers being even more eloquent on this subject than we are, we shall start right out with one from Richard Glenn, winner of the first prize of $5 in this month’s Workbench Contest. Selfridge Field, Michigan. Dear Editor: May I enter two thoroughbreds? Enclosed find a snap of my Dorothy model sloop and Tarbaby model dingy, Patches II and Baby Patches respectively. Patches II was built to scale other than being shortened 113 inches between the frames as I wanted to stay below the three-ton gross law of the Philippine Government where I was stationed. She carried 320 square feet of canvas, the mast was 32 feet in length and rigged with one-fourth- inch galvanized wire. I used about 750 pounds of con- crete for ballast inside, I had a small 11% horsepower Evinrude two-cycle cut- board, about 15 years old, remodeled into an inboard and installed off center on the port side. It gave a speed of close to 5 miles an hour in still water, turning at about 180 R. P. M., which proved that Dorothy needs very little power to move her. Of course I had to add sufficient keel for enough lateral 18 surface to make her work to the windward very nicely, which she would do unless it got too rough. Owing to her narrow beam at the waterline of course she was rather tender, but with plenty of rudder surface she could be straightened up nicely as soon as she got under way. As I will be stationed at Selfridge field now I have in- tentions of building a 27-foot skipjack schooner. Richard Glenn, Sgt. A. C Plans for both Dorothy and Tarbaby appeared in the first edition of How To Build 20 Boats, now out of stock, but they can still be obtained in blue print form. In the July issue the discovery of 200 copies of the first edition of How To Build 20 Boats was announced, and two weeks after it reached the stands, they were all gone. How- ever, the plans are all available in blue print form, and are described in the big free blue print booklet. Send a self-addressed, stamped en- velope if interested. sone The second prize letter in this month’s contest comes from Walter Buck, of San Luis Obispo, Calif. He writes: San Luis Obispo, Cal. Dear Editor: Having heen a subscriber to MM for several years, I feel that we have something in common. I want to say your magazine is one of the best on the market for every- one, and especially those fortunate people interested in various hobbies. Although I am a barber in the daytime, I am an ardent wood-worker at night. 1 have constructed many projects from your magazine, the two largest of which I am enclosing pictures. They are a house trailer weighing 1,000 pounds, constructed at a cost of $70, and an Eskimo kyack constructed at a cost of $20. In a recent issue I saw a trailer constructed from the same plans as mine (Bungalow Camp Trailer), but the total cost was given as $215. There being considerable difference in our costs, I thought you. might be interested in our comparison. Walter F. Buck. Modern Mechanix Hobbies & For fast work, Tom Gunderson, of Red Lake Falls, Minn., comes forward to take third prize with his Handy Henry Tractor. Plans for this tractor were published in the July MM, and a month later found Tom with his tractor com- pleted. These three prizes of $5, $3 and $2 respec- tively are awarded each month to readers sending in the best letters, accompanied by photographs, describing their work with MM projects. The contest is open to everyone. Remember in writing that the editors always want to know which articles you liked most and which you liked least in the current issues of MM. Tom’s letter follows: Red Lake Falls, Minn. Dear Editor: Enclosed are pictures of my Model T Ford Tractor. I am very well pleased with what I can do with her. I believe it will last longer than other outfits I have seen, and it cost me only $15. I did not follow the plans exactly as I used an old Reo transmission in place of the Dodge specified. I did not Winners of Soapbox Derby Contest The first prize of a Soapbox racer, complete with a full set of doenut tired wheels, goes to Billie Joe Neil, 309 E. 3d St., Bloomington, Ind. From the letters in the words ‘Hobbies and Inventions,” Billie gathered 2661 words. Arthur Santmier, 126 Smithfield Road, Woonsocket, R. I., is the winner of second prize, a “trike-wheeled” Soapbox racer. The third prize, a set of four doenut tired wheels, goes to H. B. Baker, Box 242, Morro Bay, Cal, raise up the rear end, but lowered the front end. I also left the tractor, full length of Ford frame but plan to shorten it as well as the front axle. It sure has plenty of power. J put on a box behind to put in sand to give better traction, I like all your mechanical plans but I miss your airplane stuff. I like least the indoor projects, Tom Gunderson. wea The old adage that “many hands make light work” is aptly demonstrated by the ever-active Hi-N-Dri Yacht Club of Los Angeles, charter members of the Society of Modern Mechanix and Inventions. Co-operation is the secret behind the success of their organization, and that they are successful is clearly shown by the following letter from David Forsyth, Commodore: Inventions, September, 1936 Cilio Workbonch Los Angeles, Cal. Dear Editor: Greetings and salutations from Chapter 12, Society of Modern Mechanix and Inventors. We havent heard much from the other chapters iately but these pictures will show that this chapter is still on its toes and going strong. The display was placed in one of the windows of our local papers to show the people that besides racing and building boats our members do and make other things. It created a lot of curiosity and interest. The other chapters might use the same idea; publicity never hurts any organi- zation. This year’s officers are: Alex Irving, Vice Commodore; [Continued on page 20] The Hi-N-Dri Yacht Club of Los Angeles recently staged this exhibit of their workmanship in the window of their local newspaper. Fleet officers for the mext year will be left to right, standing, Fleet Captain Albert Holt, and Secretary Wayne Scott, Seated are Vice Commodore Alex Irving, Com- modore David Forsythe, and Rear Commodore Robert Butte. 19

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TRAINING ARMY — AIR* * * army airman fearns to fly Mind beneath a hood in this plane equipped with dual control. K LARGE percentage of each year’s graduates of the West Point Military Academy enter the autumn class at the Air Corps Training Center, Randolph Field, Texas. This fact, and the further fact that w the flying school is conducted along lines similar to the Military Academy, has caused this Air Corps school to be popularly termed ote “The West Point of the Air.” k The colors come down at retreat ceremonies in front of the Administra- tion center at Randolph Field. This structure is typical of the distinctive architecture of the vari- ous buildings at the post. The mission of the West Point of the Air is to turn out young military pilots competent to undertake the duties of second lieutenant in an Air Corps tactical squadron. The or- “parlization of the combat squadrons requires a high ratio of young pilots to officers of &/ higher grades. This ratio is maintained by fending each year from 200 to 250 pilots, trained at the Air Corps Training Center to tactical squadrons of the regular army. The graduates of West Point are officers when they enter the flying school but the other young pilots are continued on active duty as Flying Cadets during one year. If their service shows them to be competent, they are then commissioned as second lieutenants, Air Corps Reserve and given a further year of active duty. Legislation has been passed recently authorizing the Air Corps to have 1,300 Reserve Officers on extended active duty for periods of five years each. This will enable the selection each year of approximately 270 graduates of the Training Center for duty with tactical squadrons. The proposed law provides for payment, upon discharge from active duty after a minimum of three years active duty, of a bonus of five hundred dollars. The West Point of the Air is organized to receive new classes at the Primary Flying School every four months. Each class has four months in the “Primary Stage” and four months in the “Basic Stage” at Randolph Field. The “Air Cadets” then move over to Kelly Field for their last four months at the Advanced Flying School, where they are graduated as pilots. During the Primary Stage trainees receive ground in- This Air Corps photo- graph shows how the hangars and runways fook to the student fly- ing above the clouds. FIGHTERS | struction and flying instruction on “Primary Training Airplanes” or PT’s, as they are known. In the Basic Stage the flying training is conducted in “Basic Training” or BT air- planes, larger, speedier and more maneuver- able airplanes. These provide an intermedi- ate step in piloting between the PT’s and the service types such as pursuits, bombardment, attack and observation used in the flying training at the Advanced Flying School. Since a knowledge of the equipment he is flying is essential to the student, and a con- tinuous diet of flying would make a trainee “stale,” it is convenient and advantageous to combine with the flight training, ground instruction in airplane engines, theory of flight, radio, ground gunnery, air navigation, meteorology, flight maps, airplane maintenance and other subjects. This ground instruction is con- tinued until graduation. At the Advanced Flying School it em- phasizes the tactics of each class of aviation—bombardment, pursuit, attack and observation. The student body is made up of Flying Cadets and student officers. Each new class consists of approxi- mately 150 men. The class begin- ning in October of each year usually If you would fly for Uncle Sam, read this notable article by the Assistant Chief of the Army Air Corps explaining exacting requirements of life at Randolph Field. Future Army airmen pictured as they arrive to start instruction at the “West Point of the Air.” oo is composed of from 50 to 80 second lieu- tenants from the graduating class at West Point. The Flying Cadets in this class therefore are reduced to such number as to make a total for the class of approximately 150. The Flying Cadets, with the excep- tion of a few ex-enlisted men from the army, are drawn entirely from civil life. In the period of one year at the Train- ing Center the young student receives a total of 323 hours flying instruction. For the fiscal year 1935 the flying for the Student fliers form an aerial . S. A.” with their planes over Randolph Field in Texas. by BRIGADIER GENERAL H. H. ARNOLD 37 «eM Me eM eM a OM x

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+ + tt Fe ee eH HHH = Future bombers and artillery observers receive Practice on these miniature battlefields, One problem calls for the destruction of the dam. —— Training Center, computed in air- plane flying time, amounted to 113,802.8 airplane hours. The flying time for the remainder of the Regu- lar Army for the same period was 312,575.4 hours, that of the National Guard 40,606.7 hours, and that of the Organized Reserves 23,204.8 hours. About 45 per cent of the students entering the Primary Flying School successfully complete the course and graduate from the Training Center. Most of the failures are due to un- satisfactory progress in flying. Therefore, the fact that a candidate has passed the rigid physical and the educational requirements does not insure his graduation. The Training Center, and The Faculty of the School of Aviation Medicine, now, as have many others during the past, are endeavoring to find out, “why can some people fly when others can- not.” Is it heredity, physical or mental make up, diet, habits of life, or perhaps our varying inherent fear of high places. Who knows but perhaps they -will find the answer some day and say with certainty, “This young man can be taught to fly but this one never will learn.” 38 The Flying Cadets are all young, unmarried citizens, between the ages of 20 and 27, in- clusive, of good character, sound physique, and who have had at least two years of col- lege work. If lacking the required educational credentials, they must demonstrate their proficiency by successfully passing exami- nations in United States history, English, general history, geography, higher algebra, geometry, trigonometry, and physics. The educational equation is simplified for many of these aspirants by their possession of diplomas and degrees from the country’s many colleges and universities, Professionally, these trainees are from all walks of life. Geographically, all states in the This Link trainer gives pilots instruction in nayigation and blind flying. It turns and pitches in answer to the stick. Cadets study bombs in lower photo. MINIATURE BATTLE United States are represented, with oc- casional applicants from our various foreign possessions. Students from foreign countries are frequently in- cluded in the student officer classifica- tion. However, regardless of their former occupations, or their native country, all are trained alike—all live in accordance with the same rules and regulations. During the interval embraced by the dates of October 15, 1931, and March 1, Every army flier must know some- thing about aerial photography. class is shown studying the vari- ous cameras used in map making. REE Ao aa Air Corps Photos Future airmen relax with checkers and magazines after a busy day with planes, bombs, cameras and difficult formations, When compared with similar statistics for training during the war period or with the peace time records of the schools of the armies of other nations, this small proportion is a monumental tribute to the efficiency of the Air Corps training method. What of the future of the trainee? This answer can be made: Practically all who finish at the Pri- Both wearing para- chutes, an instruc- tor prepares to take | a student aloft for his first instruction at the “West Point of the Air.” 1935, a total of 2,022 would-be pilots have re- ported to the Air Corps Primary Flying School. During that period there were 20 foreign students who came from countries as follows: 7 from Mexico, 2 Brazil, 2 Philip- pines, 3 China, 2 Turkey, and 1 each from Germany, Guatemala, Cuba and Colombia. Of the 2,000 cadets who enrolled only five have been killed. This figure deserves es- pecial consideration as it represents the in- finitestimal percentage of less than one-half of one per cent of the total number graduated. mary Flying School graduate four months later from the Advanced Flying School and following that, the Americans are assigned to Air Corps stations for duty with tactical troops. The Flying Cadet continues in grade for an additional year for seasoning and ex- perience. This is followed by a year, or per- haps two, of active duty as a second lieutenant in the Air Corps Reserve. Upon completion of this period he reverts to his former civilian status, but he may maintain active contact with the service through membership in the National Guard or Organized Reserves. A civilian with this wealth of flying experience behind him, is in a favorable position to seek employment with a commercial aviation com- pany. Then, too, there is the recent possibility [Continued on page 132] 39

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German Railroads Photo The main entrance to the Olympic Stadium, reached from the city via Adolf Hitler Place, is pictured above. Glenn Cunningham, one of America’s hopes in the events, is shown at the right. A portable German wirephoto transmitter is shown below. Science Vies CIENCE vies with sport this summer at the Olympic Games in Berlin. The host nation is taking advantage of the ancient games to display Germany’s advances to competitors and visitors from all parts of the world. A $900,000 television system, 14 trucks carrying trans- mitting equipment to various sports centers, will bring visual broadcasts of the events to that por- tion of the 500,000 visitors unable to crowd into the array of new sports field about Berlin. It will be the first visual screening of the great open air sports event. Berlin has not only constructed the great Reich Sports Field five miles from the heart of the city but has rebuilt much of the German capital in preparation for contests in which nearly 5,000 men and women will compete under the colors of 52 nations. ; A 24-acre assembly field, scene of the =] opening ceremony, has been provided to accommodate 400,000 spectators and con- testants. At one side is the Fuehrerturm, the 200-foot Leader’s Tower, from which the Olympic bell rings. The bell, made especially for the games, is 16 feet high and weighs 10 tons. The stadium proper is only slightly smaller than that at Los Angeles and will accommodate between 100,000 and 125,000 persons. Elevators have been installed to the upper tiers. An underground radio sta- tion will have connections with 30 stations Berlin’s newest television station shown at the lower left. The film projector and picture scanner is in the rear. A new electric timing With Sport at Olympics and networks in all parts of the world. A staff of 400 engineers has been employed. Contestants live in the Olympic Village, nine miles from the field and a city itself. A swamp was drained to provide the site. It contains a bank, a post office, and scores of one-story stone houses, each named for a German city and containing 10 or 12 double rooms for athletes. Preparations for the field gave employment to 1,000 workers and additional thousands labored on improvements rushed to completion elsewhere in Berlin for the event. These in- cluded a new crosstown subway with a special station for the games. A special railroad station was built and the city studded with information booths. The sports area with the auxiliary swimming stadium, open air Greek Theater and other features, occupies 225 acres on the edge of the Gruenewald at the western side of the city. Parking space is provided for 10,000 auto- mobiles in a single field. Germany leads in the number of contestants with a team of 448. The United States is second with an aggre- gation of 395. Japan which hopes to hold the 1940 Games is represented by a total of 337 athletes, trainers. and officials. The team is the largest ever entered by the nation in international competition. Several new hotels have been built and many old ones rebuilt to provide 100,000 additional beds for visitors. Unlike the Los Angeles Olympic quarters of 1932, those in Berlin are of permanent construction. A general aerial view of the Olympic Stadium and fields is shown below. The 10-ton bell, pictured at top right, hangs in the tower in the foreground. device for Olympic boxing preliminaries is shown at the right below. It registers the three-minute rounds, sounds the bell 10 seconds prior to the start of each round and counts the seconds when a boxer is floored. In the fatter case, a mechanical speaker also gives a verbal count. There are tunne! entrances to the great Sports Field adjoining and to the stadium in the background. The Olympic station of the German Railroads can be seen at the right. German girl gymnasts are shown above. German Railroads Photo

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Gar Wood and Or- lin Johnson, his mechanic, wear the smile of victory after setting a new world’s speed boat record of 110.785 m. p.h. in 1932, Left -= Gar Wood and his pet Great Dane, “Bjoerne.” OR a quarter of a century it has been my pleasure and pride to act as America’s self-appointed champion in the rivalry among nations for speed supremacy on water. I have been privileged to travel faster in an American-made boat, powered by American-built motors, than man has ever traveled on water before. Twenty-six years ago, I set my first world speedboat record, at the dizzy pace of 30 miles per hour. Today, my Miss America X holds the world record of 124.91 statute miles per hour. 46 alae pire Gar Wood as told to PAUL WEBER ‘When water becomes as hard as marble, and waves tip vanadium steel bolts from the hull as though they were cop- per rivets—that’s speed! America’s premier boat racet takes you into the cockpit of Miss America X and shows you what it is like in this article. Sixteen years ago at Cowes, England, Miss America brought to the United States the ‘Harmsworth Trophy. In itself, this small bronze plaque is worth little. But, as the historical symbol of world motorboat racing championship, it is priceless. Millions have been spent in efforts to take the trophy out of the United States. It has cost me a king’s ransom to defend it. But, thanks to luck and American engineering skill, I have been able to defend it successfully. Since the victory at Cowes, it has reposed without interrup- tion in its place of honor at the Detroit Yacht Ciub. It does not belong to the Yacht Club, nor to me. It belongs—for a time, at least— to America. These 26 years of experiment and struggle, have been a great adventure, I look back- ward with pleasure. But looking backward does not suffice; I am required also to look forward. Just how long I expect to be able to continue holding water speed honors in the United States is a question that I am often Modern Mechanix Hobbies & asked. Is the practical limit of speed on water approaching? Is it possible to go on indefinitely adding miles to that mark of 124.91 M. P. H.? I should like to be able to make some satis- fying reply to these questions. But I have § no idea what the “practical limit” of water speed may be, if, indeed, there is such a thing. I- feel sure that 150 M.-P. H. is well within the possibilities of boats of present basic design. How far beyond that we can go without some radical change, particularly ` in power plants, it is not within my power to prophesy. One thing definite is that the battle for speed honors has become a battle for more power in motors. Give me a 3,500-horse- power motor and the world will see a “new deal” in speed on water. But you could not buy such a motor in America today for its weight in government bonds. A 3,500-horsepower motor is not an im- possibility. However, before we go into the Inventions, September, 1936 Wide open Gar Wood streaks down Indian | Creek, Flas in Mi America X-on record-breaking dash. His speed was 110.785 nautical miles per hour, Below—Life belt. and neck brace give evidence of the hazards of high speeds in boat racing. reasons why such motors are not made in this country, let us consider the two things that produce speed in a boat like the Miss America X. These two factors are power and planing ability. Boats of the Miss America type are known as hydroplanes, which means “water planes.” The hydroplane does not plow through the 47

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In his father’s footsteps. Gar Wood, Jr., poses for cameramen after setting two records in Class A and C events at the National Motor Boat Sweepstakes. water like an ocean liner or a pleasure yacht. It skims over the surface when going at high speed, and the hull rides almost entirely out of the water. This “planing” is caused by the lifting power of the plane surfaces which make up the bottom of the boat’s hull. It is extremely important that these planing surfaces are set at the proper angle in rela- tion to each other to bring about the proper lift. On the Miss Americas we have always used only two planing surfaces. On their relative positions depends her maneuver- ability, speed and, in fact, her actual ex- istence. The sharp break in a hydroplane’s hull where the forward planing surface ends and the aft planing surface begins, is called the “step.” The forces effective on the planing surface ahead of the step are unbelievable. The planks on the bottom of Miss America X are bolted to the hull timbers with bolts of vanadium steel, heat treated for the utmost strength. Yet we sometimes find them 48 = Miss America Tenth, in the background, pulls up to pass Miss England III in the Harmsworth Trophy race. Gar Wood piloted Miss America, and Kaye Don piloted Miss England. Wood won. wrenched loose, as though the water had gigantic fingers. When Sir Henry Seagrave, of heroic memory, was killed at Lake Windermere in England, in 1930, it was stated that his Miss England hit a floating log. In my opinion, what really happened, was this: Sir Henry was experimenting with the location of his “step,” to make his boat plane properly. He had not been able to figure it out mathemati- cally or from experience. So he fastened a makeshift temporary “step” on the bottom of his boat, with the idea of changing its position to suit conditions. He was wrong. It proved not strong enough. The water’s pressure tore part of the “step” out of the Miss England. The boat overturned and Sir Henry was crushed to death. He was a great sportsman and a hardy competitor. His death was a tremen- dous loss to England and the whole world of sport. Through continued experiments and the construction of the successive Miss Americas, we have assembled a treasury of information about what takes place in that small area— hardly larger than a kitchen table top— where the speeding hydroplane rests on the water. We feel that American engineers now know at least as much about this factor in building super-speed boats as any other engi- neers in the world. Although there is much still to be learned in this field, boat design has ceased, at least for the present, to be our major problem. The second factor in the make-up of a Modern Mechanix Hobbies & A crucial moment in the Harmsworth Trophy race of 1932. Kaye Don in Miss England has stolen the lead from Gar Wood, the “Silver Fox of Boating” and is head- ing for victory, A moment later he ran into motor trouble and Wood coasted in to an easy triumph. The race was heid at the Detroit Yacht Club, hydroplane is power. And that’s something else. The engines installed in the Miss America X are four Packard V-twelves, the most powerful gasoline motors in the United States. They are direct descendants of the famous Liberty engine. This motor was de- signed and developed by Col. Vincent, of Packard Motor Company, and Mr. Hall, of the i Hall-Scott Company, and their associates, for American airplanes during the world war. Fundamentally it was as good a motor as had ever been built, and it is still practi- cally as good a motor as can be obtained in the United States today, power for weight, for marine purposes, Of course these Liberties havent sufficient power for super-speed boats, although they were used in the first five Miss Americas. - The Packards in the Miss America X origi- nally generated 725 horsepower each. By applying superchargers and various experi- mentations, we have stepped them up to 1,900 h. p. each. This illustrates the possibility of inereasing power by persistent effort, and it sounds like a tremendous lot of horsepower. But let’s see what sort of power Harmsworth challengers bring against us. When Lord Wakefield sent Kaye Don over to drive his Miss England HI in 1932, the Miss England Inventions, September, 1936 Gar Wood is now searching for the 3500 horsepower motor, light enough for a speed boat. He is convinced that speed boat supremacy rests not in boats and men, but super-motors, carried two Rolls Royce motors capable of de- veloping nearly 2,500 h. p. each—a total of 5,000 h. p. against the 3,000 we could develop with two Packards in Miss America IX. To be sure of enough power to drive the Miss America X to victory we decided to use four motors against Don’s two, regardless of additional -weight. In other words, pounds for horsepower, the British challenger was far better equipped than we were. Miss America X’s weight was approximately ten [Continued on page 135] 49

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Whirling Funnels Here’s the How and Why of „Death Dealing Tornadoes By One of the Foremost. Midwest The author, who for years has made a hobby of tornadoes and their vagaries, is shown broadcasting a weather report in Topeka, where he is U. S. meteorologist. TORNADO is the most violent type ot storm known to inland America. Except in daytime in the open country, tornadoes come without warning—a terrific roar, com- monly described as resembling “a thousand freight trains,” often a weird whistling sound, and the crash of wreckage, and the storm moves on, leaving a trail of desolation and often death that seems incredible considering that the passage of the storm requires only a few seconds. In the 20 years ending with 1935, Weather Bureau reports list 2,702 tornadoes, with a death list of 5,258 and a property loss in excess of $225,000,000. The greater number of these storms occurred in the mid-western and southern states, though very few parts of the country have escaped. In the open country of the plains states, tornadoes occurring in daylight hours can often. be seen approaching, sometimes a quarter of an hour before they strike. There is a swift exodus of families into basements or storm caves. Experienced persons in these sections often seem to develop a knack for recognizing “cyclone weather,” and are alert to take refuge when threatening clouds loom up. This results in many unnecessary rushes to basements and caves, but it saves 52 Meteorologists. Terror is the natural reaction when a storm of this kind appears, This tornado swept through the northern suburbs of Wichita, Kansas, on February 24, 1935, injuring six persons and causing $10,000 dam- age. Two miles farther south, a great disaster would have resulted. human life when a tornado really strikes. In large cities, with vision cut off by buildings and the warning roar of the storm muffled by city noises, there is seldom any notice of a tornado until buildings begin to crumble. Life then becomes a matter of chance. A tornado, still miscalled a cyclone in spite of the educational efforts of the Weather Bureau, is caused under certain conditions by abnormally warm, moist air being over- run by colder air. The warm air, being lighter, is foreed up through the colder, much as a cork is forced-up in water, and its move- ment is governed by the same law of moving liquids that sets up the whirl in a draining bath tub, except that in the case of the tor- nado the movement is upwards. The usual description by persons who have seen the start of a tornado is: “Two clouds Modern Mechanix Hobbies & Spread Disaster This splinter was driven deeply into the post during a small tornado it the suburbs of Topeka on June 3, 1927. E. C. Corkill, Weather Bu- reau official, is examining the splinter, which could. not be removed without breaking. seemed to come together.” A violent whirl starts at the cloud level and bores its way down towards the earth’s surface. When it reaches the ground destruction begins and dust and dirt drawn up soon make the cloud a menacing black color, usually with much lightning and hail. The speed of the whirling winds in a tor- nado has never been measured, but has been estimated at 300 to 500 miles per hour. The decreased pressure inside the whirl, similar in a way to the vortex in a draining bath tub, actually causes buildings to explode when the normal atmospheric pressure inside the walls is suddenly exerted against the lowered pressure outside as the tornado passes over. Tornado clouds are generally spoken of as being funnel-shaped, but eye witnesses often describe them as resembling ropes dangling from the sky, as “snakes in the sky,” or more commonly as resembling an elephant’s trunk. The latter is a very apt description, as the cloud has a tendency to sway back and forth Inventions, September, 1936 Some of the damage is shown at the left after a tornado killed 203 persons and caused $6,000,000 damage in and about Gainesville, Ga., last April 6. Inhabitants of Hart- ner, Kans., dived into their caves so rapidly that the above twister passed without fatalities on June 2, 1929. as it moves along its path. A collection of almost 200 views of tornado clouds in the Topeka Weather Bureau, probably the largest collection of its kind in the world, shows some that are inclined from the vertical until they are almost horizontal, some that seem to be bent into right angles, some that are larger at the bottom than at the top, and some that are huge vertical columns. Tornadoes travel along their paths at what in these days is considered a moderate rate of speed—usually 30 to 40 miles per hour, and seldom more than 60 miles per hour. They can readily be out-run by a person in an automobile with an open road ahead. It is even possible to avoid them on foot, if they are seen in time, by running at right angles to their path, preferably towards the north 53

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STUNTING ona M It looks easy but it really isn’t. This champion rider illustrates a riding pose which, difficult as it is in itself, is the basis for shooting balloons, juggling balls, riding backward and other antics. PANG exciting, sensational—a three-word description of motorcycle stunt riding. Since the introduction of night lighted stadiums, oval track motorcycle racing is growing fast in popularity and with . this breath-taking sport has come the rebirth of stunt riding. Putt Mossman, Oakland, Calif., champion stunt rider is taking its popularity around the world. He is touring with a group of riders. “Any person who is physically fit and can ride a motorcycle can learn to do stunts,” explains Lawrence N. Weaver, prominent California stunt rider, and a member of the California Highway Patrol. “They must, however, have a perfect sense of balance to be able to carry on with stunts after they start them or an accident will result. They _must have that sixth sense which automati- cally tells them just where to put their foot or which way to sway their body. They 56 F. LELAND ELAM oe : tells the inside story of professional stunt motorcycling—riding the bronco bikes. San Francisco’s Don Rodman, a super daredevil, claims that crashing The Wall of Death is only dangerous to those who haven’t the feel of their wheel, who are nervous and careless. must be cool and not nervous, have no fear, and be confident. “Partner stunting is the most difficult. They must have perfect confidence in each other. They must synchronize in their work. “There are no set rules for doing certain stunts. Each rider must work out his own procedure as best suited to his own build and weight. All real stunting motorcycles are lower than stock machines although a stock machine can be used for many stunts. The safest stunting speed is from 30 to 35 miles an hour. There are many different stunts and only a few that are new. There is a future in motorcycle stunt riding for the persons who can meet the requirements.” Modern Mechanix Hobbies & Gene and Ruth, a pair of well- known stunters, are shown here in action at Lin- coln, Neb., Ruth leans back over the front wheel while her partner balances on one foot in the sad- dle. George Sowopoulos, famed Greek per- former, is shown below riding a Harley-Davidson in a wall exhi- bition at Athens. One of the most thrilling of motorcycle stunts is wall crashing, says Weaver. At night it is exceptionally spectacular. The req- uisites for this stunt are steady nerves, a sturdy and speedy machine. The wall is six feet square. It is con- structed of boards 34-inch thick and six inches wide, nailed on a frame of 2x4 foot boards with 4x4 foot posts at each side. The rider always picks the wall boards as they must be soft, fir being used mostly, free of knots, and straight of grain. A piece of mosquito netting is tacked loosely on the side from which the crash is to be made. Excelsior is placed between the wall and netting. Coal oil is poured over it. Just before the rider starts on his 70-mile- an-hour ride the material is set afire. When Inventions, September, 1936 Could you climb a ladder atop of a driverless motorcycle spinning along at a steady pace, as shown in the thrilling picture above? The stunt rider does it by climbing the ladder backwards, crossing the top; then descending the other side. If there is any wind whatsoever, a bad spill is the inevitable result. But it’s an indoor stunt. the wall is crashed the rider passes not only through a wall of wood but a wall of flame. Metal hand guards and a metal helmet are the only protective measures taken by the rider. A horseshoe shaped frame of steel extending from the front wheel forks over the handlebars and down to the other side of the wheel is used sometimes instead of the plates on the handlebars. It is necessary for a rider to take many positions on the cycle and he must have a feeling for the proper position for his feet so as to get the correct balance. Among these stunts are ones in which the rider stands on the seat. While this is no easy trick, it is made difficult by shooting balloons, playing a drum, juggling balls, and riding backward. [Continued on page 127] 57

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Part of the imposing $2,250,000 Ford show is shown in upper left. Gen- eral Motors has a $950,- 000 display in the above building. wei Three marionettes of the Sue Hastings troupe ride in a train made of Chrys- ler parts displayed at Dallas. y G li SA Frances Nalle, 21, red- haired Dallas beauty, is official "Bluebonnet Girl” at the Exposition. A robot made of auto parts draws a crowd at the left. XHIBITS showing automobile advances in speed and safety are almost half of the dollar value of the $25,000,000 Texas Centennial display now attracting visitors by the thousands to Dallas, Texas. Largest exhibitor at the celebration mark- ing the 100th anniversary of Texas freedom is Ford with a $2,250,000 display. General Motors has a building and display valued at $950,000. Chrysler is present with a $500,000 exhibit. The event continues through Nov. 29. The Ford show includes 15 major exhibits in the air-conditioned Ford Exposition build- ing. A replica of the company’s by-products plant, complete to railroad sidings, attracts model railroad enthusiasts. There is a service exhibit showing the development of auto service from the blacksmith days to the present. All of the exhibits show methods of testing materials and means of assembling. A me- chanical man made from auto parts is a feature of the Chrysler show. He not only turns his head and lifts his arm but he can hear and speak as well. [Continued on page 126] Decked with the traditional Lone Star flags, this Court of Honor is one of the principal features of the $25,000,000 Texas Centennial celebration at Dallas, The Hall of Petroleum appears in the background. A- night view of the Esplanade is shown in the searchlights illuminating the scene in the Hollywood manner. star with & Pretty Jane Collins is one of the “Rangerettes” adding beauty and color to the show, Below, a replica of the Ford by-products plant, complete to railroad sidings, attracts scores of visitors.

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GREAT satisfaction to the bass fisher- man is a tackle outfit that will give him the maximum in enjoyment in handling, but which will, at the same time, touch the peak in effectiveness: The right rod, the right line and the right lure for the occasion. That bass may be taken at times on very crude tackle goes without the saying, but it is not all of fishing just to fish. Fishermen are rapidly getting in the habit of using both a bait casting rod and the fly casting rod in their fishing, having come to a realization of the fact that where the one will not avail itself, there the other one may prove unusually effective. To be efficient in both departments is, therefore, to a decided good effect and gives one the unusual oppor- tunity of testing out both methods of fishing where the situation calls for one or the other lure and manner of delivery. Obviously the fly rod has no place in the midst of the pads and other vegetation when the bass are in such locations. Here the bait rod, with vari- ous weedless pork-rind and wire-guarded lures, will prove effective. But where unob- structed water is to be met with, around recks, sunken trees, stumps, etc., there the fly-red will do wonders, and may produce bass when the bait rod will be found wanting. Drop a fly in combination with a spinner oh 64 Se e A E E ae E EEE ame oe he SPORTSMEN'S a FOR THE BEST by ROBERT PAGE LINCOLN a shaft in these last-named locations, and it is a wise bass indeed that does not make a dash at it with deadly effect. The bass fisherman, therefore, who carries with him both the fly-rod and the bait-rod . has at his command two deadly weapons, for which any bass water affords an opening. It is because the bait rod and fly rod can thus work together so effectively that the fisher- man should possess and should become pro- ficient in the use of both rod types and their methods. Bait casting for bass is, without doubt, more commonly practiced throughout the country than any other manner of taking bass. The first bait rods that were put forth in this country were rather long, ranging in length up to eight feet. From this extreme No bass fisherman can resist the lily pads. Here lurk the big large mouth, waiting to be tempted by a pork-rind lure or any other weedless baits, This lake is typical. The small mouth bass is one of the gamest fish in fresh water. This catch represents a day of thrills for three men. Either bait rod. or fly rod lures can be used against this battler, depending upon type of water. CAMPFIRE length they went to the other extreme and dropped down to as short as 3, 31% and 4 feet. In more recent years this rod length ‘was - stepped up to the extent that 5 and 5%4-foot rods are now considered standard for length, although 4% and 6-foot rods are to be had, the latter especially fitted for the casting of very light lures. $ It is obvious in the selection of a bait cast- ing rod in bamboo that it should be picked according ‘to the weight of bait that is to be used. There are light, medium, heavy and extra heavy bamboo rods. That fishermen attempt casting heavy lures with a too-light bamboo rod accounts for breakages every season. It is obvious so far as bamboo rods are concerned that they should be definitely picked according to the work they are sup- posed to do. To treat a bamboo rod other- wise is sheer injustice. Certain features with regard to the fittings Like trout, small mouth bass prefer fast water, although now, due to stocking, they are found in both streams and lakes. In this water, a fly rod is a big advantage. A short cast into fast water, and Robert Page Lincoln has hooked an- other one. He is playing this small mouth with a five and one-half foot steel bait rod, one of the most popular lengths. of the bamboo bait casting rod may be men- tioned. Guides are fitted with garnix linings, also agate lining, also in a stainless steel chrome plated. Agate lining is excellent, but the steel guides are now fast coming into prominence. Both agate and garnix guides will crack and break, but steel guides in- variably hold their own. The handle should be of the best grade solid cork and there should most assuredly be a forward grip, that is a grip ahead of the reel. This grip permits of a sure and com- - fortable hold on the rod. Without it one does not have the proper control over the rod. Again, there should be a finger pull under the reel seat, which the trigger finger can grasp when casting. The value of the finger-pull lies in the ease and sureness with which the rod may be handled. Those rods not fitted with finger-pulls, may have de- tachable ones slipped on. However, most bait casting reds now are supplied. with these pulls, Bamboo rods generally come in single enamel, six strip construction. Double built rods involve the lamination of two pieces of the outer or fibrous enamel of the bamboo, and cutting V-shaped strips from the same, [Continued on page 137] 65

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A miracle home, swiftly made and erected by modern Science, is the pre-fabricated house, Industry’s most-needed invention for home seekers. Presto! fac- tory-made panels be- come dream castles. The house above, featured by the Hobart Brothers, of Troy, Ohio, is a S-room, arc-welded steel house, cost- ing about $3,600. There are other views of the house on this page. At the factory (see picture over the one just above) the bip roof is arc-welded into four portable sections and shipped by rail or truck. This type of roof gets away from average “box type” house, heretofore so objectionable to builders. Above—The roof portions are lifted from the truck d assembled on top of the house. Circle—Note the artistic layout of the interior of the house and bow the living room merges into the dining room without the use of doors. It is a model of simplicity, even to the placing of the glass- topped steel furniture, the mirror and also, the drapes. Truly, these pages re- flect the creative spirit of America’s progress. by DONALD G. COOLEY BRICATED ‘6 {NIVE me a living room, bath, kitchen and two bedrooms. Wrap them up and de- liver them in time to assemble my home for occupancy the first of the month.” The scene is the display room of a pre- fabricated house manufacturer, and the speaker is Mr. Average Man out shopping for a new home. He has just made his choice of rooms from a wide variety displayed on the demonstration floor. The manufacturer will deliver the pre-fabricated units from his warehouse—wrapped in a cellophane Modern Mechanix Hobbies & Above is a late model by the E. Hodgson Co., of Dover, Mass. They have been building pre-fabri- cated homes for 25 years. ROOM eon eee eae — eae HOUSE ARRIVES package, if he has a flair for the dramatic— and in a week or two the proud new home owner will be able to step into a marvelously efficient house whose cost is well within the limits of a modest income. It all sounds like one of those intriguing visions of the future which nobody really ex- pects to come true, but the startling fact is that the day of the packaged house is almost here. A survey reveals some two dozen com- Inventions, September, 1936 This little dream house in the piñes is what many yearn for, and is another artistic model by Hodgson. The owner of an unencumbered lot valued at $1,000 can erect a pre-fabricated house with a cash payment as low as $375, with the remainder at an average rate of $23.53, including fire insurance and taxes. panies actively engaged in developing and marketing such houses. A pre-fabricated house is built up of wall panels turned out in quantity in factories with high-speed machinery. Panels come with doors and windows fitted into them; even plumbing pipes and electric outlets can be built in at the factory. The plumber, elec- trician, and plasterer are to a large extent eliminated. What will the pre-fabricated house look 71

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Circle—The house built of copper is rather expensive, but it has the advantage of lasting indefinitely. A blow on the house will not result in a metallic ring, as one would imagine, because insulation between copper walls absorbs the sound. like when it is unwrapped from its package? There is as yet nothing like a standardized form, and probably never will be, but in gen- eral the packaged home will be square-cut, free from gables, turrets and complicated ornaments, modernistic in general outline. Wood will give way almost completely to metal. The framework will be of steel, except where panels are used which supply their own frames. Walls will be amazingly thin and well in- sulated, with a corresponding increase in usable floor space. Costly basements will be 72 NEW PACKAGED STRUCTURES CAN The photograph illustrates how fast the factory-made house can be put together, once the foundation is laid. It shows the simplicity of setting into place a pre-cast panel of Earley Process Mosaic Concrete. Panels are anchored by a novel engineering device that creates a perfect, waterproof structure. eliminated. Heating and air-conditioning equipment operates cleanly and silently enough to be placed on the ground floor. Windows will be opened with cranks like those in automobiles. Plaster walls will dis- appear in favor of metals or processed plas- tics. The interior arrangement of rooms can even be altered after the house is assembled, for inside partitions have no part in support- ing the house. Flat roofs will be generally favored, adapted as sun decks and actually affording an additional outdoor room. And how much will it all cost? You can buy the pre-fabricated units for a two bed- room, living room, kitchen and store room house for as little as $1,050, and you can range upward to $15,000. In general, what the average man regards as an average house will cost around $4,000 from any one of sev- eral pre-fabricators. The ultimate aim is to supply homes to those family groups who cannot afford more than $2,500 for a house. The Roosevelt ad- ministration, actively attacking the pressing problem of low-cost housing, estimates that 90 per cent of our population falls within this Modern Mechanix Hobbies & BE ASSEMBLED ON income bracket. A survey of the field shows an amazing variety of structural materials obtainable, all of them fireproof, termite- proof, rainproof, hurricane-proof, vermin- proof, and proof against so many other con- tingencies you can literally describe your house as being one hundred proof. Steel, aluminum and other metals will be widely used. Glass will become important, not only for windows but in the form of hollow bricks for translucent walls or interior partitions. The house framework will be of steel, just as in skyscrapers, except in those versions where no skeleton whatever is used. In this category fall pre-cast concrete panels, and chan- neled steel panels which themselves support the house. One company is ex- perimenting with plastics —the ma- terial out of which the caps for tooth- paste tubes are pressed—for use as structural panels. Such a house would literally come out of the chemists test tube! Already in pro- duction is the Moto- home of American Houses, Inc., of New York City. This firm turns out a wall panel made of a cement and asbestos mixture com- pressed into a slab 21⁄4 inches thick—which is the thickness of the completed wall, since in- sulation is provided by the panel itself. It is claimed that the panel never requires paint- ing and that ageing in the weather improves it until it reaches a hardness exceeding that of limestone. The panels are four feet wide and ten feet high, and come in three standard units—a blank panel, a window panel, and a door panel. These are supported by a steel frame. Spun glass is used beneath the roof for in- sulation. Cost is said to be 16% less than for the same amount of usable space in tra- ditional-type houses. National Houses, Inc., also of New York Inventions, September, 1936 General Houses, Inc., are . Pioneers in the develop- ment of the pre-fabricated steel panel and steel frame house, which are put to- gether with a socket weench, They have just introduced new model homes to sell from $2,500 to $5,500. These houses are built in 2-foot sections. City, uses no frame in its system of pre-fabri- cation. Sheet steel panels are used for the outer and inner walls, separated by a four- inch space which is packed with a special insulating material known as “vermiculite,” which is essentially powdered mica. Four inches of it give the insulating efficiency of a fifty-inch stone wall. The panels are simply bolted together and the exterior surface sprayed with marble dust, giving a fine-grain stucco-like finish of great durability. This design was developed by William Van Alen, architect of the Chrysler building in New York, which made history in skyscraper design by having its top 18 stories finished in stainless steel. A four-room National House with garage costs around $4,000, the garage representing $300 of this cost. This company also offers sloping roofs at the option of the [Continued on page 122] 73

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PLASTICS REVOLUTIONIZE Out of Test Tubes Come Man- Made Products Smashing. Tradi- tional Fabrication Methods and Making Cheaply Available Shin- ing Articles of Surpassing Utility. An ancient game is now played with pieces of a new material. hese chessmen are made of Catalin, one of a score of the new plastics brightening life. S THRILLING as any Polar exploration is the day-by-day chemistry in America’s laboratories. Here intrepid men with test tubes and beakers forge into the vast uncharted lands of science. More money is spent in this cease- less venture than was ever dreamed of by Byrd or Stefansson. The cost is reckoned in millions—even, as with radium, in human | life—but the gains are worth the battle. For out of this pioneering comes new wonders to revolutionize industry and add comfort and enjoyment to living. The average American gets up in the morning, switches on the light, shaves, has breakfast, buttons his coat, hops into his car and is off to work. In that short morning hour, usually without realizing it, he has many times made use of a peculiar substance that not so long ago was unknown. That substance is the plastic, a brilliant new child of modern research. The electric light switch is plastic. The razor and its case are probably plastic—as are the handles on the breakfast cutlery, the buttons on the coat, the knobs on the instrument panel of the car. Bright, sturdy and useful articles are all of them—yet they were made The material beneath the dishes is washable Fabrikoid. The Remington knives have handles of Dupont rubber. The worker below is forcing Catalin into desired forms. 80 Modern Mechanix Hobbies &. AMERICAN INDUSTRY by W. A. SWANBERG This new dinnerware is made at Hopewell, Va., with pencil line trim- mings unaffected by wear, water or acids, thanks to research. from sour milk, from the fuzz of cottonseeds, from carbolic acid or from thin air. All are recent triumphs of the laboratory. New as they are, plastics have several decades of history behind them. Celluloid, one of the first widely known plastics, is familiar to all; and Bakelite has long been indispensable in telephonic, electric and radio construction. Yet after these had been on the market for years there sprang a new and versatile aggregation of plastics that brought new moldability and workability, new color and more uses. Though of some- what different formulae, and suited for dif- ferent uses, all have two things in common. All are plastic—capable of being molded or cast. And all go through the chemical process known as polymerization, in which the mole- cules of the substance combine by enlarge- ment of molecular structure. Inventions, September, 1936 After Dr. Leo Baekeland discovered Bake- lite almost by accident in 1909 when he was trying to make a fusible synthetic resin, the creation of new plastics slumped. For years Bakelite and Celluloid were the only im- portant ones used in America, and each had definite limitations. Celluloid, admirable as it was for many uses, was highly inflam- mable; and Bakelite, despite its utilitarian excellence, could not then come inte popular use because of its cost and blackness. America needed a popular plastic—a sub- stance cheap, fire-resistant, and capable of taking on beautiful colors so that it could be used in the drawing-room as well as the tele- phone exchange. Not until the last decade did such a product appear. Beetle, Catalin, Durez, Plaskon, Tenite, Resinox, Unyte, and many others—all are new names, all trade names of brilliant plas- tics made for thousands of uses. Outwardly similar, they are chemically different. Lus- 81

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STARTLING NEW SUBSTANCES trous, vari-colored Catalin, for instance, can- not take the place of Bakelite in telephone and radio; nor can black Bakelite replace Catalin in the construction of toilet articles and chess- men, where beauty is needed and dialectricity is not. Roughly, plastic can be divided into three groups: Those made from vegetables, from animal, and from mineral matter. These boxes are made of new plastic materials par- ticularly adaptable to the manufacture of shining table and desk articles. Newburgh, industry. A scene in a re- search laboratory ier Chemists conduct endless experiments in their quest for new substances for Cellulose—the fiber forming the cell wall of all plants, but found in its purest form in cotton—is the old and the new titan in plastics. From this cheap and plentiful vege- table base came the earlier Celluloid; and it now makes Pyralin, Tenite and cellulose acetate. Though it will burn slowly, cellulose acetate is not highly inflammable as was the older Celluloid. Buyers of Cord, Auburn and Hudson cars this year have steering wheels made of this newest plastic. Sheets of Pyralin one-fiftieth of an inch thick are sandwiched between two thin panes of glass to make modern automobile safety glass. And tough, gleaming Tenite now makes thousands of fountain pen barrels, as well as many other semi-transparent things. It seems a far cry from cow’s milk to buttons, yet chemistry has hurdled the distance, America’s button industry—a but vital product—relies largely on milk for its basic material. Casein, made from milk, is chemically combined with formaldehyde to form a lustrous plastic that is giving buttons a more prominent place in wearing apparel. Mineral plastics are composed chiefly of phenol (carbolic acid) combined with for- maldehyde. Of these the well-known Bakelite and a few others are molded into desired shapes, are black in color, and trial use. Others such as Catalin are made . from similar basic materials but are cast into sheets, rods and tubes of brilliant large producer concentrating on a small’ therefore are largely restricted for indus- . REDUCE COSTS IN MANUFACTURING colors. This bulk stock can be fabricated by cutting or by turning on an ordinary lathe, resulting in colorful cutlery handles, knobs and novelties. Among the most useful of the phenol plastics is the laminated type, such as Formica, in which canvas or other fabric is pressed into the material for greater strength and insulation. Modern motor cars can thank laminated phenolic formaldehyde for a large degree of their quietness. Gears of this substance have widely supplanted steel because they wear remarkably and do not clatter. In the new ocean giant, Queen Mary, too, is $100,000 worth of decorative material made from fire-resistant American Formica. One of the newest compounds to startle the market is the urea plastic, a mixture of nitrogen—snatched from the air—with car- bon dioxide and formaldehyde. Unlike the others this is manufactured first as a powder and is then molded. Grocery scales made by the Toledo Scale Company used to be housed in cumbrous metal that made them weigh 160 pounds. The company substituted Plaskon, a urea plastic, for its metal housings; in so Playtime gadgets of doing it reduced the baal They are see weight of the scales to oi synthetic resin, now = pomas ands trebled aioe A oea Industrial war is the hyde is ovencured and shaped, inevitable result of a successful new material. When one considers that many industrial units formerly made of several pieces of metal bolted together can now be molded in one piece of plastic, thus saving the cost of assembly and painting, the answer is obvious. Yet there are many uses which plastics cannot as yet fill, because of mechanical limitations. Will research remedy that by [Continued on page 130] This Fabrikoid table setting shows possibilities of plastics in several phases of household use. Catalin is shown at the right in forms available to fabricators. Toilet articles of Catalin are pictured at the left. The table cloth is made of silver-white and sapphire-blue cellophane. 82 Modern Mechanix Hobbies & Inventions, September, 1936 83

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Auto Parts Make Efficient SOLID TIP => DRILL HOLE OR HOLES AND FILL AS NEEDED TO OBTAIN EXACT BALANCE WITH MELTED LEAD. BALANCE AFTER AS- SEMBLING TO HUB & MOUN TING RABBET ` i" PLYWOOD RIBS MOUNTED” N FREE ON SPAR COPPER OR ALUM: ` STRIP SEALS EOGES —3N OLO WIRE WHEEL HUB SPLIT TUBE HERE AND DETAIL EXPAND TO CLEAR SPINDLE or HUB " HOLES IN STEEL SPAR PERMIT POSITION OF BLADE TO BE s ALTERED TO CHANGE PITCH £4 DETAIL OF BLADE CONSTRUCTION SOLID WOOD END FORMER.-RASBET AS SHOWN FOR 3-PLY COVERING a AS nn, \. VARIABLE PITCH AD- JUSTMENT HOLES ON BOTH SIDES OF HUB MUST BE SPACED EQUALLY COLLAR, 1/8" PLYWOOD i COVERING MACHINE BOLT PINS BLADE IN DESIRED POSITION SECTIONAL VIEW THRU COLLAR AND ; oe BLADE-SPAR i } NV SEE CROSS- SECTION ABOVE SEE DETAIL OF SPAR AT HUB STEEL OR IRON COLLAR BOLTED TO END FORMER A SIMPLE FORM OF VARIABLE PITCH FAN FOR WIND DRIVE POWER The propeller blades are constructed from plywood with airplane tubing forming the rigid center core. Spacers placed 9 to 12 inches apart serve as mountings for the plywood covering. If one side of the propeller is too heavy drill holes in the tip of the other blade and fill with melted lead. A copper or aluminum strip seals the edges of the blade and prevents chipping. by DOUGLAS P. ROLFE NE of the many problems confronting the prospective builder of a wind driven generating plant is the selection of’a suitable windmill or propeller. While the flat-bladed, fan type is usually selected by amateur builders there is a strong argument for the airplane type propeller and as a matter of fact it is becoming increasingly popular. In the first place old airplane propellers are fairly easily obtained and are not at all ex- pensive. While in certain instances an old airplane propeller may prove satisfactory there are many more cases where its value is something less than zero. Many times these propellers are too heavy and have a fixed “pitch” which may be quite unsuited to the prevailing winds of your locality. , This article will proceed to outline the 90 construction of a simple, reasonably light and quite practical “fan” which is built something in the manner they put autogiro vanes to- gether. It can be built by anyone able to use tools and has moreover the answer to your particular “pitch” troubles incorporated in its design! The first item is a ball bearing hub. This would be expensive and difficult to produce in a home workshop. Fortunately this neces- sity does not exist as the junk yards are teeming with hubs, and spindles, too, ideally suited for the purpose. Any light car hub and spindle is adaptable although for small units the rear hub from an old motorcycle may be used. As the drawings show, this hub forms the starting point for the wind propeller. The blades, built up of plywood on formers, are spaced along the central spar and are adjustable to provide variation of “pitch.” How this is done can be seen quite Modern Mechanix Hobbies & WINDCHARGER Plants These efficient windchargers were con- structed from old auto parts at practicall no cost, Results equal expensive:plants. OLD AUTO WIRE WHEEL HUB (WITH SPOKES REMOVED) & DRUM BUILT-UP METAL OR TURNED MAPLE SPINNER FRONT VIEW OF PROPELLER HUB OLD FRONT AXLE CUT DOWN AND BOLTED TO BEAM eo PIVOTED BEAM Ee. OLD. AUTO GENERATOR SIMPLE BALL- BEARING MOUNTING PLYWOOD OR METAL. i= VANE - SIZE TO SUIT- BOLT INTO SLOT CUT IN HOUSING w COMPLETE REAR “\ HUB AND ORUM BRAKE SHOES REMOVED —= eo REMOVE AXLE ON THIS SIDE -LOCK DIFFERENT- IAL GEARS PA A N | N OLD REAR N AXLE UNIT X RY | MAKE SIMPLE SAA SEARING ASS DRIVE SHAFT- 1, NU EXTEND AND { CONNECT TO | UNIT TO BE b> DRIVEN WOOD (MAPLE) PULLEY-BOLT TO DRUM HEAVY DUTY 4 FAN BELT f j ai y ar 7 34 MAKE TOWER I5 GUIDE | k TO20 FEET HIGH BEARING if -A SUGGESTED REAR AXLE CONVERSION FOR WINDMILLS Junked automobile parts are ideal for use in building a sturdy windcharger plant. A front axle cut down and bolted to the pivoted beam makes an ideal propeller mounting, The ball bearing hub of an auto wheel provided with a maple wood pulley is ideal for windcharger use. clearly from the detail diagrams. The central spar or tube may be of iron but it is far better to use a length of steel tube for this. Tubing such as is used in airplane construction is ideal for the purpose. The diameter of the tube is in direct relation to the diameter of the propeller you, plan to build. General proportions are shown in the accompanying drawings, although actual constructional de- tails may be varied to suit the builder’s own ideas and, to some extent, his materials avail- able. For instance, the blades are adjustable on the spar itself as shown, but two tubes may be employed and attached to the hub in such manner as to permit varying the pitch at this point of attachment if so desired. It is assumed that most amateur builders plan on using automobile generators for their wind electric plants. This presupposes some gearing up to insure adequate revolutions in a moderate breeze. To accomplish this a hard wood pulley is attached to the hub with Inventions, September, 1936 Mount the generator under the pivoted beam and gear to propeller with “V” belting. a length of “V” belting to make the connec- tion direct to the standard generator pulley. The hub pulley for best results should be between 8 and 10 inches in diameter. Heavy duty automobile fan belts are excellent for the drive belt. For really large ambitious wind plants something more substantial is necessary. Many ingenious ideas have been developed and carried out with standard automobile parts. For a light windcharger plant an old front axle cut down and bolted to the pivoted beam makes an ideal mounting. In this case the wood pulley is bolted to the back of the brake drum with the fan belt connecting to the gen- erator which is mounted directly underneath ona bracket. A plywood vane of suitable size attached to the opposite end of the beam com- pletes the windcharger. For best results the device should be mounted at least twenty feet in the air either on a housetop or tower. 91

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CHECKING the CAR for Elusive Crankshaft pounding is caused by loose HALF OF BEARING bearings. Tighten bearing bolts or scrape g with a scraper made from a half round file as shown above. Use Prussian blue in the scraping process so that surface is made perfectly round and not oval. O MATTER how good an automobile motor may be it will eventually get noisy and begin to lose power. While the power factor is very often ignored the presence of noise is most objectionable. Crankease pounding, valve hiss and piston slap are the more common TION OF BEARING = REMOVING BUSHINGS & PINS BY CONTRACTION IN HOT WATER SET PISTON ON BLOCK -7| PISTON PIN OR BUSHING To simplify the removal of bushings and pins from the piston assembly submerge in boiling water to expand the metal, then drive pins out with an old pin which has been ground down to serve as a punch. Place the piston on a block of soft wood during the removal operation, HIGH SPOTS TO BE SCRAPED. BEFORE REPLACING, OIL BUSHINGS WELL’ After completing the scraping of a bushing it should be well lubricated, oil being spread out with finger tips. This completed, bushing may be assembled. GASOLINE IN causes for a motor to be noisy and lacking in its power output. While these items appear to involve special processing that can only be attempted by an experienced mechanic, it is possible for anyone with a fair knowledge of automobile construction to correct trouble. Noise caused by worn bearings can usually be detected by the loud dull sound produced. The same sound is present if they are merely loose, therefore first check for loose bolts and if the trouble is not here take the bearing apart and re-scrape it. A tool for this work can be made from a half roind file which has been ground into a concave blade. A similar tool can also be fashioned from a triangular file in the manner made clear by the diagrams. After smoothing off the inside of the bearing sections smear on a thin coat of Prussian blue then re-assemble the unit. 92 This bushing and pin remover is a handy piston tool, screw should be sized to fit piston rod bushing so it may be removed freely. DOUBLE End of pressure CRANKCASE WASHER CAUSED BY LEAK IN DIAPHRAGM OF FUEL. PUMP, REPLACE DIAPHRAGM FITTING FOR o1INe STEEL WASHERS FELT WASHER: CYLINDER TROUBLE DETECTOR A handy cylinder trouble detector for locating piston knocks and similar noises can made from an old tire pump pro- vided with double washers and threaded reducer to fit spark plug taps. Fuel pump squeaks can be eliminated as shown. Modern Mechanix Hobbies & Engine NOISES sx’ su Until now only the most experienced auto mechanic could track down an elusive motor noise. This article tells how you can easily correct these annoying sounds. Turn the shaft several times in the bearing, then open the sections. High spots will clearly show up and should be removed so that shaft turns freely. Worn piston pins and piston rod bushings are also responsible for much of the trouble. An old pin ground down makes a handy tool for removing piston pins. A simple screw device similar to the one illustrated on this re, ORELON guren gong m ] SOMBUSTION ey: SEAL STOP HISSING LIGHT SPRING, ani TR WEAR IN ta e GUIDE. GUIDE CAUSES KI N AIR LEAK ya SLAP. SPRING: STOS Pr SRAPHITE PACKING BASE BOA BORE WES TO FLOOR STARTING MOTOR i PINION SLAM | Waner. All valves must have a uniform spring tension if the motor is to perform efficiently. Springs may be quickly checked on the simple spring balance device shown above, The proper adjust- ment of the valve tension can be determined by referting to the cross section diagram illustrated at upper left. Asbestos: graphite packing in the counter bore will eliminate valve hiss. The starter motor mechanism should never be oiled. Instead plain gasoline should be squirted into mechanism from time to time. A small hole drilled in motor housing permits access to starter spring and the unbalanced pinion for pouring gas. Inventions, September, 1936 MOTOR CAN BE REBORED, THEN FITTED WITH NEW PISTONS PISTON SLAP. SLAP T ROTATION WITH EXPANDER “BULLY RING Piston slap is often due to one side of the cylinder wall being worn down, The only correction for this trouble is to re-bore all cylinders to the first oversize and use new oversize piston rings. The above diagram shows the cause for pistons to slap. page will aid in the removal of worn bushings. Placing the entire piston in boiling water for several minutes will expand the outer metal sufficiently so that pins and bushings will come out easily. Where the piston rings have caused the cylinder walls to wear rough, re-boring is necessary. For this work the proper hand drill attachments should be used to insure a perfectly true surface. When re-boring, grind out the cylinder to the first oversize and secure piston rings to fit so that there is no leakage of power. It is easy to find the exact cause for the particular noise your car has developed by using a simple cylinder trouble detector. Secure an old auto pump and install a double washer plunger on the shaft, then fit up the end of the pump with a connection threaded to fit a spark plug tap. When a cylinder is suspected remove the plug, screw on the pump then turn over the engine until the pump handle is forced upward. By removing the pan and allowing someone to hold the rod a loose piston can be immediately de- tected. In assembling the pistons be sure to lubricate the surfaces of the bearing well by applying heavy oil to the inner surfaces and smoothing out with the finger tips. The bear- [Continued on page 126] 93

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PULL-CORD CONTROL OPENS GARAGE DOORS Automatically ERE’S a simple, automatic garage door 1 then drive the car out of the garage. A pull control with which you may close your on the control rope “A” will release the garage doors as you drive out and open them catch holding the doors open, and the 11- without leaving the car when you are ready pound weight will close the doors by its pull to drive in. on the rope “D.” Rope “B” is spliced to The illustrations explain clearly, the con- ‘rope “‘A” at the proper point to make this struction of the various mechanisms required operation possible. It should be noted that in the construction. while the doors are open, a pull on the control When the doors of the garage are closed, rope “A” will release the catch on the a pull on the control rope “A” releases the stationary beam, but rope “E” prevents the 24-pound weight as in Position 2. The release of the trigger catch controlling the weight opens the doors and the catch on the drop of the 24-pound weight. 7 stationary beam engages the first roller You will not find it necessary to leave the Apaust fc i Staci To | bracket on the movable beam which holds car to operate the control from the time you i RELEASE OF the doors firmly in a wind. The catch on the drive out of the garage until you have driven Bate WT. |. BRACKET ‘| stationary beam is placed so that the movable the car into it again. DOORS ani Fa WiTHour. beam will project about 18 inches beyond the Always remember to reset the 24-pound WT. IS lisa 24LB WT. door frame in full open position. weight each time you leave the garage, nee SERIER orton ToT a Reset the 24-pound weight as in Position whether you are driving in or out. OF THE OPENING MECHANISM xem, SPLICING THE CATCH is W CONTROL RELEASING Ų TRIP TO ALLOW THE WT, TO DROP After backing the car out of the garage, the driver merely has to reach out the window and pull the cord, thus closing the doors. A second pull on return opens them. PE TO CONTROL ROPE,|| SEE DETAIL S'INCH SS AND OPEN PULLEY KNOT AND WASHER TO ALLOW RESETTING PULLEY DOORS / WILL NOT SLIP THRU OF 24 LB. WT., ROPE a | / RoPe © To DETAIL SCREW-EYE MUST MOVE FREELY pE 24LB.WT. or see Beta RI E ~ IN THIS DIRECTION DIRECTION „e "Xl" HD. WOOD ARMS OF LENGTH OF PULL, AS NORMAL TO de DOORS AT CORRECT 24LB, WT. POSITION ANGLES WHEN MOVING BEAM IS OPENS OF TRIPS POSITION IN OBEN POSITION DOORS: CATCH ENGAGES, ROLLER AND g ROLLER OAS s BRACKET ASSEMBLY J SPRING SCREW-EYE a = 2"X 4" STA. BEAM GARAGE i SPACE TO PASS 4"MOVING DOOR 22 CATCH EASILY SEAM DETAILS OF BEAMS 4"X 4" CONTROL 16UB.WT. KEEPS IN CLOSED POSITION= ` POST IS SET IN = ROPE“ TAUT, AND SERVES ` : AS Hi LE TO DNS Resets Bale, WT, DOORS ARE OPEN, WT, IS BEING RESET THIS CATCH ENGAGES Robie BRACKET TO HO! DOORS IN OPEN POSITION GARAGE, DOOR SUSPENSION 2"X 4" IS CUT AWAY TO ALLOW : THE MOVING BEAM ROLLERS TO PASS FORM FROM ANGLE IRON: PLATES =\ REINFORCE ENDS OF DOOR ARMS zr HLB. WT. 1S IN POSITION TO CLOSE DOORS AS SOON AS CATCH IS ROLLER A AN RELEASED MOVING BEAM i k 7 = A DETAILS OF HINGE FROM ARM TO DOOR el x Details o. a Suspension of the statior b earl; a 24 LB.WT. HAVING PHANTOM X IEW OF M NG ils of automatic controls and weights are giv iD he stationary beam is clearly i | è FOR MOVIN wee A g! e given th d. This t f OPENED 0O ORS is GARAGE SHOWING T E ss - pa ; : l TS AND CONTROL POST, of the garage door to insure rigidity. The will prevent wear. As a safety measure, box-in weights. colle sakoald’ be’ kept’ well, lubricated: 96 Modern Mechanix Hobbies & Inventions, September, 1936 97

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A Midget Foot-Powered Locomotive by MANLEY MILLS

CAB ROOF MAY BE MADE TO LIFT ON HINGES FOR EASY ENTRANCE

as ha- UILT mostly from discarded, materials that can be readily picked up about the workshop this novel foot-powered midget locomotive will make any youth the envy of his friends. Unlike the usual foot propelled locomotive, this one permits the engineer to ride in the cab instead of in the tender. While it isn’t necessary that the dimensions given here be followed out to the Nth degree, they should be followed as closely as possible in order that the locomotive will operate properly. In constructing the engine and tender start with the frame for the boiler. This is made from lengths of 3”x1” stock as is | the rear cross-member and pilot beam. The pilot trucks are made from the front end of a coaster wagon chassis equipped with 9” 20"

45".

= eee

i L_ E) Pa 2B FRONT o ELEVATION

urd Pai: 2

The CHASSIS DETAILS NOTCH FOR 76" PILOT XI" STRINGER

HOLE FOR f BEAM X PEDAL CRANK 7 FORMER "B" Rob NS {BR miea IS OF PLYWOOD, Yo THICK REN, MEMBER

1⁄4 PLywoop 4 SIDE PLATE

34 SQUARE PEDAL CRANK UPRIGHTS, BRACKET 3x0"

XM CRANK BRACKET SUPPORT tatie EA MEMBER Š f `] BEARING u | | N BLOCK W"'x2ls, | y

PEDAL & MOUNTING

—— DETAILS meo a 6" Teer aed 6 ja xe ! SAFETY TEA | SECTION THROUGH "X SAFET STEAM 4 i HEADLIGHT Aon a! Ae Ao ae z gece | Be ee {TYPE | A 5 12 34" ry | | =SOUTHERN— s Wy E -i pra: ò === F 9" COASTER

WAGON WHEELS

~

The above pictorial diagrams show the simplicity of the toy locomotive. While it is not necessary to follow the exact dimen- sions given here adhere to them as closely as possible. Parts from broken toy autos and wagons will aid in construction. 100 Modern Mechanix Hobbies & That Any Boy Can Build wheels. The pilot guard is fashioned from either wood strips or strap iron, the latter being suggested. The boiler is of the thinnest gauge sheet metal obtainable and attached to a suitable wooden frame with small wood screws. The cab is made of plywood except for the roof which is of the same metal as the boiler. Sheet metal attached to a wooden supporting frame forms realistic cylinders for the driving rod mechanism. The drive rods being noth- ing more than lengths of stock measuring 34x2x38” are extremely simple to make. A pair of 20” bicycle rims are screwed in place over a disc having a diameter equal to the inside diameter of the rims. A notch is cut in the discs to allow for inflating the tires. The drive shafts are attached to the wheels [Continued on page 120]

THESE NOTCHES : TO TAKE !" SQ. STRINGERS ry See BUNNING BOARDS What boy wouldn't be proud to Fi PPORT ON BACK OF FRONT BOILER FORMER be engineer on this locomotive. CYLINDERS WX STRINGER ND CROSS HEAD ASSEMBLY ~* ~~

CROSSHEAD GUIDES hxc

PATTERNS OF FORMERS AND © BOILER SUPPORT, }_ ALL OF ¥ STOCK =

SCREWS TH FRAME INTO CLEATS

DETAILS OF CRANK-THROWS ON ORIVE~WHEEL AXLE

Eie

%sa. la SECTIONS OF SUPPORTS CAB FRONT AND 2

FRONT OF TENDER Booy

PEDALS

Peran" Y" =< NOTE: LEFT WHEEL TURNS FREE ON AXLE.. RIGRT WHEEL AXLE IS OF IS FASTENED YB STOCK TO AXLE

= DRIVING MECHANISM ==

Oe REAR VIEW OF CAB The above diagram shows the construction of the driving mechanism and ite approximate location inside the cab.

Inventions, September, 1936 101

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Practical MODERN FURNITURE IRON WORK FOR CHAIR & TABLE HOLES FOR SCREW; eee 3/4" RADIUS | CHAIR ARM 2 REQUIRED TABLE LEGS 2 REQUIRED sel ._SE | | DRILL aa HOLE --FLAT [RON Modern furniture is easy to make. The upper photo shows how a scratch wheel may be used to give the metal a bright finish after which it is lacquered. Center photo is shown the table top being squared up on the shaper with the leg installation clearly defined in the lower pictire. NONIS END IS CHISELED ‘OFF, HAMMERED: DOWN ae FILES. Not only is this modern table and chair durable, but very attractive as well. Constructed of strap iron and plywood the furniture can be worked into the color scheme of any home. Forming of the metal parts can be done at home by following the diagrams given here. The height may be SMALL TAC! TABLE TOP FABRI “UNDER SIDE — altered to meet the particular needs although care should be taken to keep one leg or chair arm from being higher than the other. The furniture ie covered with plaid fabric. 104 Modern Mechanix Hobbies & FOR THE WORKSHOP FAN For the home shopman who makes his own, these interesting pieces of ultra- modern furniture are certain to win favor. ANY pieces of the wood and metal modernistic styled furniture that is now so popular can be easily duplicated in your home workshop. If you are the owner of a few woodworking tools and have access to a strong vise and forge you are ready to start construction. If you don’t have the latter equipment any blacksmith shop can quickly form the metal for you at a nominal charge. The modernistic chair and table pictured on the opposite page are extremely simple to make and when completed prove unusually attractive. About 32 feet of "x2" strap iron, three pieces of 34” plywood, one piece 48”x22” for the table top, another 19”x10%” for the chair back and a third 19”’x15” for the chair seat are the only materials required. The strap iron for the table legs is bent according to the dimensions given in the diagrams. Holes drilled and countersunk in the metal allow the table and chair legs to be attached to the plywood. In making these metal pieces make certain that they match so that the furniture sets level. The height of the table may be increased to meet your particular needs if desired. The chair may be constructed with or with- out arms. If arms are desired cut nibs in the strap iron so that the formed metal can be rigidly mounted to the chair legs. To do this drill holes in the leg and back supports, insert the arm nibs then hammer them flat as you would rivets. The table top, chair seat and back are finished by covering them with a water-proof plaid material similar to the coverings used on cardtables. Cotton wadding under the material will greatly improve the appearance of the project. After removing all rust par- ticles from the metal it can be enameled in a color that will contrast with the plaid ma- Inventions, September, 1936 terial. Probably the most attractive combi- nation is a red, orange, green or blue plaid with the metal parts finished in silver bronze although any combination ‘may be used. Twin beds in the modern trend of design supply another idea for the ambitious shop- man. The beds, which are ideal for a small guest room, consist of four units; head, foot and two side rails. The head and foot pieces are made of 4%” plywood panels with a 34”x 2” trim around the edge and mitered at the corners. The trim is attached with finishing nails and casein glue after which casters are mounted, The bed rails are of stock 34”x6”x6’x2” with bedhooks attached to each end. These being obtainable at any hardware store. Slots cut in the head and foot pieces allow for 105

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TURNING CLAY PROJECTS on The throwing wheel, on which the pottery is turned, is cut out of plywood on a power jig 6 The bottom of the disc is provided with an undercut belt groove. The drill press is reversed and the wheel attached to its chuck. by DALE R. VAN HORN OMETHING new in home workshop projects and seldom attempted by the amateur is the turning of pottery articles. Not only is the making of clay articles in- teresting, but simple if your shop includes a floor type drill press. The extreme rigidity of the modern drill press makes its adaption to turning a potters’ wheel ideal. The first step is to reverse the chuck and motor position with the chuck under the table and centered with the center hole. To bring the end of the motor shaft in line with the wheel groove it was necessary to cut out a board for the purpose, drill the necessary holes, then bolt it to the motor support as a photo shows. The largest wheel possible to use with this drill press is one about 14 inches in diameter, so this was cut from 5-ply wood with the jig saw. To utilize as much of this large diameter as possible for speed reduction, yet get the belt just under the edge where occasionally mud and water would not work under it, a groove was cut with one of the shaper knives to the shape shown. An ordinary sewing machine belt was used. Two turns of friction tape wrapped about the motor shaft itself and the belt run di- rectly on the shaft will provide an ideal speed of about 114 R, P. M. A belt tightened with 108 RADS 4" APART = nna ig “OLES FOR BRADS p= HOLES HERE FLANGED PULLEY. USE ANY THAT HAS 1/2 “HOLE 1/2" STEEL ROD 4"~6" PLASTER PARIS LONG Ss >. PALETTE. Ee ful Œ ASSEMBLY A THIS END FITS REGULAR SEWING INTO DRILL CHUCK MACHINE BELT A steel flanged pulley screwed to the bottom of the plywood disc completes the throwing wheel assembly. A short length of \4-inch steel shafting connects to the flanged wheel and the deill press chuck as described above. Plaster of Paris palette is attached to the top of the wheel with small brads. A regular sewing machine belt transmits the power from motor to wheel. Suitable clay for pot: tery work may be se- cuted from a local brickyard for a few cents. The clay is handled in the same manner as dough after which it is rolled out, as illustrated above, into long rolls using a flat board for the working tool. In making the coils it is advisable not to have the clay too moist, otherwise it may stick to the forming tools. Modern Mechanix Hobbies & A POTTERS’ WHEEL Attractive vases, crocks and jars of baked clay can be produced in the home work- shop. An ordinary drill press forms the basic throwing wheel equipment. an idler pulley to be operated with the foot will provide graduated speeds. This can be clamped to the drill press table and removed when wanted. Of course, with a little prac- tice you will be able to turn out nice pottery pieces with the constant speed wheel. Floor flanges are not accurately drilled, so a better line up results if any ordinary grooved pulley fitting a half inch shaft is drilled for 2, 3 or 4 screws midway between rim and center and this fastened to the exact center of the plywood wheel with wood screws. The 4 or 6-inch half inch shaft is then fastened in the pulley wheel with the set screw provided, and the other end of the half inch shaft set tightly in the drill chuck. Start the project by applying a pliable lump of clay | to the plaster palette then with H throwing wheel turning at a speed of about R. M. spread out the lump with a broad putty Raife as shown here. =A os WOODEN ented, arte SMOOTH STEEL ROD.: « SECTION THRU VASE Only simple homemade tools ‘are required for turning pottery projects. These consist of a simple elbow rest, a fiexible putty knife, steel rod and clock spring mounted on a handle. Inventions, September, 1936 Above is pictured one of the completed pieces of pottery turned on the home throwing wheel with the various stages in its construction shown below. Note that the clay rolls are placed around the palette gradually and more added as the bottom is completed. The neck of vase is added last and this turned to shape, carefully. The wood wheel should be given a double coat of clear lacquer or varnish and special attention given the rim, both top and bottom, to render water proof, Two or more palettes should be made from plaster of Paris. Mix the plaster and pour it out on a flat surface to harden. Then drill two holes to fit the brads in the wood wheel, drop in place and with a file tang held vertically and the wheel in motion, cut through the surplus plaster to leave a round palette upon which pottery is to be made. [Continued on page 128] 109

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“MM METAL TUBE MASTER” — Employing the latest metal tubes this unique : portable sound system can be constructed in the home workshop. a Above is shown a rear view of the MM Master with the lid of the cabinet raised. The speaker attaches to the chassis. by J. R. MACK Small enough to carry around yet ‘extremely powerful, MM Master is an ideal sound system. EARLY everyone at some time has wished for his own portable public ad- dress system either for supplying music for a party or in making announcements at out- door gatherings. Practical portable sound systems are usually expensive, therefore placing them beyond the reach of the average income. Realizing this fact an amplifier was decided upon which could be constructed by anyone the least bit familiar with radio. Through the use of modern metal tubes and a high-gain circuit the completed public ad- dress system offered all of the advantages of the expensive equipment yet it cost less than $25 to build. Parts for building the amplifier may be purchased from any mail order or local radio “Appearing more like a travel- ing bag than an amplifier con- tainer this case made of leatherette and: wood nicely solves the carrying problem. 6C5 TUBE OUTPUT TRANSFORMER, KO 500 OHM LINE INSTRUMENT VOICE Sol PICK-UP JACK SPEAKER ATA SWITCH xo no VOLTS canson mike. MFO TRANSFORMER ‘> I) mpo. I POWER TRANSFORMER F The experienced radio builder will find this schematic diagram helpful in wiring up the amplifier, Wherever possible connect leads directly to the ground so as to eliminate all unnecessary wiring. Pick-up and microphone jacks should be insulated from panel. Since all metal tube sockets have the same number of piongs care should be exercised so that connections are made cortectly. Although indicated at 550 volts, power transformer can have plate voltage output of slightly more or less than this. 112 Modern Mechanix Hobbies & A PORTABLE SOUND SYSTEM supply house including the metal chassis although it is quite simple to make this your- self from No. 16 galvanized sheet iron. The panel is laid out according to the dimensions given on the diagram and then bent to shape. Any tinsmith will do this work for you for a small charge. The sockets for the metal tubes are in- stalled first, after which the power trans- former, A. F. transformers and other mount- able items are fastened in their respective positions. The speaker is a 12-inch dynamic type mounted to the front of the chassis with machine screws. The field coil winding of the speaker serves as the filter choke thus saving valuable chassis space. A type 5Z4 tube serves as the rectifier with two 8-mfd. electrolytic con- densers providing the necessary filter capacity. [Continued on page 124] Here is the completed Master be- fore installing in the carrying case. Although a workshop job it has all the makings of an expensive manufactured amplifier. For best sound coverage a 12-inch diameter dynamic type speaker is suggested. NOTE: 6 VOLT LEADS CONNECT TO HH PRONGS ON TUBE SOCKETS 3, SWITCH 500 OHM LINE 250 OHMS Ñ 500,000 VOLUME CONTROL 10 VOLTS No advanced radio experience is needed to build the Master. The above pictorial diagram shows the exact place- ment of ali the necessary parts. JACK | cal MICROPHONE CHASSIS DIMENSIONS The chassis is cut as shown from No. 16 galvanized iron, The cabinet is. of wood covered with leatherette material, CUT HOLE.FOR SPEAKER DIMENSIONS OF PLYWOOD CABINET | SPEAKER MICROPHONE TRANSFORMER PHONOGRAPH PICKUP Inventions, September, 1936

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