Modern Mechanix, December 1934

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_VE6i 34 AMERICA'S INDUSTRIAL FUTURE An Interview with DET Ls PAGE 46

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4900 Chemical Formulae In This One Indispensable Book. In this one big book you have at your fingertips practical commercial formulae for making thousands of useful products for your own use and for profitable manufacture. Brand new, encyclopedic in scope, arranged for quick reference, it is exactly the book that every commer- cial chemist, large or small, has long wanted. 600 Meaty Pages of formulae including many patented, scarce and little known processes, many published for the first time. Collected by over 60 outstanding industrial chemists and tech~ nicians—every formula proved successful by actual test and experience, Covers Hundreds of Industries Thousands of Products You will find, in The Chemical Formu- lary, methods for making or using: Adhesives” Air Conditioning Alloys Anti s Aromatics Asphalt Bronze Lacquers Candles Candy Glaze Carbenizing Catalysts Celluloid Cement Cream, Cold Coffee Substitutes Colors for Oils Decolorizing Preparations Dental Cement Depilatories Disinfectants Dyes KElectrotyping Etching Compounds Explosives Fertilizer Fireproofing Fireworks Fluxes Fly Killer Food Specialties Gems, Artificial Glass Polish Glues Gold, Plating Grease, Lubricating Hair Setting Liquids Hair Tonies Incense Inks Insulation. Jams and Jellies Kalsomine Lacquers Latex Paint Leather Polishes Liniment Liquors Lubricants Matches Metallic Printing Matrix, Rubber Mirrors Nickel Plating Qil Sun-Tan Ointments Paints Patent Leather Photographic Specialties Polish, Auto Porcelain Preservatives Printing Refrigerants Rubber, Synthetic Safety Glass Shaving Cream Soaps Solvents Stencils Tooth Paste Waterproofing Zine Etching Zine Plating and thousands more. ONE FORMULA ALONE MAY BE WORTH HUNDREDS OF DOLLARS TO YOU Every formula in this book is of practical, commercial value. The volume is not merely a collection of “household stunts’? or experiments for the amateur, but a mine of money-making ideas for everyone concerned with commer- cial chemistry. In addition, you will find it a quick-reference book for a vast amount of information that you need in your daily work. Send for your copy today. EXAMINE IT FRE Send No Money MailThis Coupon D. VAN NOSTRAND CO., | | 250 Fourth Ave., New York | Send me on approval The Chemical Formulary, Within 5 days after I receive it, I can return it to you and owe | nothing. If I keep it I will send you $2.00 as first pay- i ment and I will pay $2.00 monthly thereafter for 2 months—$6.00 in all. I (5% discount for cash. Same re- turn privilege.) (M.M l | | 12-34) Name Address se CY .weenneaes Reference | Address .. i ‘ Every Needed Fact, Figure, Formula | Every Shortcut and Special Method in the WHOLE FIELD a8 of > x MATHEMATICS | Now in ONE Handy Volume! For the first time you can have this wealth of practical mathematical information, covering every trade and busi- ness, condensed into one handy book for quick reference. This volume puts right at your finger tips instant facts and formulas for making every kind of mathematical calcula- tion. From hundreds of different sources, this priceless in- formation has been gathered together, boiled down into brief, simple language, and applied to actual problems Every man in business, every man in the mathematica trades, every man who ever uses a tool or has to make calculations or estimates in office, shop, or home, will find here a treasury of money-making, money-saving ideas. THE HANDBOOK OF APPLIED MATHEMATICS No previous knowledge of mathematics is needed, tudy is required. The specifie informaticn you want is ef to find, by looking it up in the in- dex. The book takes up every trac and giv u practical methi ily-worked formulas for solv problem. Tho nds of spe- cific examples show you just how to make your calculations. If your work involves mathematics in any way this complete ret ence handbook is an indispensahl part of your equipment. Tt i n amazing time saver for any one can- with engineering, architerttre, electricity, mechanics, construction, aute- mobiles. machinery, printing, or ar other industrial work: or with accoun ing, auditing, manufactu ng, costs, taxes, or any other business mathematics. No practical man, no house owner whe makes an o ional repair, no one wl has a home work-shop can afford to } without the valuable information quick- Iy found in this book, See How Thoroughly It Covers the Needs of free “RAPID ARITHMETIC” Cloth Bound Regular $1.50 Book YOUR Work Gives you quick Arithmetic k Lathing and methods ‘of addition, Gneluding Slide Plastering subtraction, multipli- Rule) Painting cation, division, frac- Algebra Plumbing tions, interest and Geometry Heating discount, percentag Trigonometry Machine Shap Weights and Automotive Shop Measures Sheet Metal Work Mechanics Electricity interesting, Exeavations and (D.C. and A.C.) curious puzzles of nuni- Foundations Print Shop bers, amusing and in- Concrete Business structive. Given abso- Brickwork Mathematics i lutely free with THE | Carpentry and Accounting : HANDBOOK OF AP- Building à 7 PLIED MATHE- MATICS. EXAMINE THIS BOOK FREE SEND NO MONEY —MAIL THIS COUPON D. VAN NOSTRAND CO., a | 250 Fourth Ave, New York Send me on approval The Handbook of Applied Mathe- | | matics and Rapid Arithmetic free. Within 5 days after. | I receive the books, I can return them and owe nothing. 1 If I keep them I will send you $2.00 as first payment and $.. i I will pay $2.00 monthly thereafter for 2 months—$6.00 | in all, (5% discount for cash.) (M.M.12-34) | Name I Address

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MAIL THE COUPON: a Get my big 64-page FREE BOOK of information on the opportunities in Radio. Get the facts on this fast-growing Geld with a future. Let me show you how N.NI, Training fits you for jobs servicing, making, selling Radio sets; how it trains you to start a business of your own; to get a job as a Radio Operator on an ocean liner or in a commercial or broadcasting station; how it prepares you for Television, aviation Radio, police Rudio, loud speaker installations and service; and many other branches of this fast- growing, good-pay industry. Learn how you can prepare quickly, at home in your spare time, to be a Radio Expert. lind out how you can develop a spare time Radio business to increase your income, while you keep your present job. MANY RADIO EXPERTS MAKE $40, $60, $75 a week Why struggle along through life working and worrying to make both ends meet when it ts so easy to enter fascinating, profitable Radio work. Find out how to get ready for a good job in the live-wire Radio fleld. Many men now holding important positions in Radio gat their start through N.R.I. Training. Practi- cally every important Radio organization has one or more N.R.I. graduates on the payroll. MANY MAKE $5, $10, $15 A WEEK EXTRA IN SPARE TIME WHILE LEARNING Hold your job. I will not only train you in a few hours of your spare time a week, bul the day you enroll I’ll send you instructions which you should master quickly for doing 28 easy-to-find, easy-to-handle Radio jobs com- mon in most neighborhoods. Fred J. Dubuque. 19 Church St., Oswego, New York, writes: “I have made about $1200 in a little over two years’ spare time Radio work.” Others report good earnings in spare time Radio work. Read many of their letters in my big 64-page book. YOUR MONEY BACK IF NOT SATISFIED I’m so sure you will be satisfled with my train- ing that I agree in writing to refund every penny of your money if you are not entirely satisfied with my Lesson and Instruction Ser- vice when you finish. FIND OUT WHAT RADIO OFFERS YOU—NOW! Get my Free Book TODAY. It has shown hundreds of fellows In all walks of life how to make more Qi money and win success in Itadio. | M 1lt’s Free to every ambitlous fel- | ve low over 15 years of age. IN- VESTIGATE—find out about tho opportunities which await ambt- | tlous men In Radio—about my $, | training—what others who havo | k taken it are doing, how much fi ;: | Money they are making, what | they think of N.R.I. Training. J. E. Smith, President, National Radio Institute Dept. 4NH, Washington, D. $. 3 ed Sane Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers J. E. Smith, Pres. National Radio Institute, Dept. 4NH i Washington, D. C. 1 Dear Mr. Smith: Without obligating me, send free book { about spare time and full time Radlo opportunities, and | how I can train for them at home in spare time. | (Please print plainly) Name: aeetas cr A ET ET errr BEG ba ics | i AGWC3S E T E ETT EE ETA ee RN ISAR i CIty sce wa Dee eels ee RR Oe Siete: State.......... i

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A TRUE INCIDENT IN THE LIFE OF AN R-T-I TRAINED MAN Car washer for Cana- dian Pacific Railway. Drudgery. Long hours. Dirty, unhealthy work. $18 a week—when he worked. And no chance for advancement. That was the life of Wil- liam T. Ridd, Verdun, P.Q., Canada—before he en- rolled for R-T-I Training. TODA Y—a business of his own. $1500 worth of equip- ment fully paid for. Earn- ings averaging $60 a week. Secretary of Radio Service _Men’s Club—-and writing paid articles for Radio page of leading newspaper. ‘Clean, healthful work. Safe -from pay cuts and unem- ployment. “Entirely due to R-T-I Training” says Mr. Ridd. ; He clipped the R-T-I Cou- pon. Why don’t you? R-T-1S Famous Advisory Board of Nationally Karl Hassel Known Radio Engineers and Executives Dr, C. M. Blackburn Chlef Radio Engineer Stewart-Warner Corpora- tion. Kendall Clough Chief Engineer, 4 Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers . Clough- Corporation. Brengle Co. (Radio Engi- Homer Hogan neers and Manufacturers). General Manager a see YOU" on sAr Look “gt ares Mote? po Radio Is Full of Real Oppor- tunities for Trained Men My book has shown hundreds of fellows how to quickly make more money and win success. It tells you about the famous Advisory Board of top-notch Radio engi- neers who take time from their jobs with big Radio Companies to direct and supervise your R-T-I Training . . . about the 45 lead- ing Radio Manufacturers who en- dorse my training and recommend it to you... about hundreds of my students and graduates who have doubled , and tripled their earnings as a result of R-T-I Training . . . about the wonderful future ahead for “trained” men in Radio. Many Make $5 to $20 a Week In Spare Time. . . While Learning That’s what many of my students do soon after enrolling. Hold your job. Give me only part of your spare time. When you enroll for R-T-I Training, PU send you clear, simple instructions for “cashing in’ on part of your spare-time by doing neigh- borhood service jobs. L. M. Christensen, Deweyville, Utah, wrote: “Have already made $250 doing spare time Radio work. Did my first job two weeks after enrolling.” Chief Engineer Zenith Radio KYW, Chicago. E. E. Gramer Chief Engineer Standard Trans- former Corp. F. D. Whitten Service Manager adio Station l 2130 Lawren l | Chicago Plant Name corens erse Philco Radio and Television Corpo- Address ....sseee08 tation, | Clty wcccesees aes My Money-Back Agree- ment Protects You Radio service work is just the start- ing point in R-T-I Training. I give you FIVE Advanced Courses, with- out a penny extra cost, that takes you up through the very latest develop- ments in Radio and into the new and larger field of Electronics—Televi- sion, Sound Pictures, Photo Cells and Public Address Systems. I give you 4 BIG OUTFITS OF RADIO EQUIP- MENT to work with. Makes R-T-I Training practical “Shop Training” for the home. Mail Coupon NOW INVESTIGATE! Learn why 45 big Radio manufacturers endorse and recommend R-T-I Training .. . how the famous R-T-I Advisory Board works for you and with you... what my Employment Department does to help you get into your favor- ite branch of Radio after graduation, -.. about my Money-Back Agree- ment, and the many other outstand- ing R-T-I Features. Clip and mail the Coupon NOW. = RAY D. SMITH, President RADIO & TELEVI. SION INSTITUTE Chicago MAIL COUPON FOR FREE BOOK RAY D. SMITH, President Radlo & Television Institute (R-T-1) 2130 Lawrence Ave., D ent 39 Dear Mr. Smith: Without obligating me send FREE BOOK about spare-time and full-time Radio opportunities and how I can train for them at home.

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PRICE 15 CENTS (20 CENTS IN CANADA) Z BU we SPECIAL FEATURES Henry Ford Discusses America’s Industrial Future - - . . = By Glenn F. Jenkins How Experts Trapped Lindbergh Kidnap Suspect - - - By Peter Levins Greatest Passenger Liner Launched - $500 Cash Prizes for Home Improvements - - - a =. = Invalid Car Features 1935 Auto Models Why Speed Lost in America’s Cup Races By James Dyson Zulus Invented Lightning Rods -a By Nic Sprank in Oddities of Science Fire At Sea! Can Science End Disasters? By Captain Felix Riesenberg Taking Micro-Photos With Your Camera By Julian D. Corrington, Ph.D. Preparing Your Car for Winter Driving By Professor B. J. Robertson Behind the Scenes on Movie Battlefields By Harry Redmond Underground Cannon Brings in Oil Gushers - - += + = «© ou Sportsmen’s Campfire b So m S By Robert Page Lincoln, Hunting and Fishing Editor Sea Glider to Span Atlantic in 3 Days - Exploring California’s Mansion of Mystery - - «© «© «© «# « By Dean S. Jennings CONTEN TIOR TS CLA ERE] 36 42 45 46 51 54 57 60 63 64 68 73 74 83 84 oe Volume XIII Number 2 Gis $500 IN PRIZES! How would you improve your home? Modern Mechanix and Inventions offers $500 in prizes for home improvement ideas. See Page 46 for Details SHORTER FEATURES Solving Readers’ Problems - 14 Wrecking Chicago’s Century of Progress - - - - 53 Finding Your Way When Lost in the Woods - = = 74 Hunting Vicious Wild Boars - 77 Needed Inventions - - - 86 Factory-Built Homes Shipped by Truck - - = - 88 Curing Noisy Auto Brakes - 99 How to Run a Furnace - - 103 With the Collectors - - 114 New Business Products - - 154 HOW-TO-BUILD FEATURES “Varsity Jr.” Football Game - 96 By J. R. Johnston Build Front-Steering Iceboat 100 By Julius J. Fanta Six Novel Suggestions for Christmas Gifts - - + 104 Wire System for Toy Trains - 107 “Little Theater” Sound Effects 110 By David A. Brown (Contents continued on page 6) . en

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Il GOES THE PRICE OF HAVING comfort hit. an. all-time low in price with the announce- ment of Probak Junior—the remark- able new double-edge razor blade. shaving blades, uniform in quality, for only 59¢. You'll wonder how such fine blades can be sold for so little money. Probak Junior is the product of unequalled manufacturing methods and matchless skill. This blade is automatically tempered, ground, honed and stropped—gives you won- derful shaving satisfaction. Try Probak Junior and see for yourself. Get them today from your nearest dealer. Probak Junior fits all Gillette and Probak razors SHAVING COMFORT Think of it! You get 25 keen, smooth- ' TABLE OF CONTENTS (Continued from page 5) NEW MECHANICAL INVENTIONS Wireless Supplies Permanent Wave - - - 40 Frisco Air Tram to Make 100 M.P.H. - - 41 Grinder Reclaims Broken Drills - - - - 41 Device Stops Loss of Tube-Cap - - - - 41 Harvester Eases Cotton Picking Labors - - 44 New Lock Guards Traveler’s Door + =- - 44 Electric Reel Has Varied Uses - -. = - 44 Lights Create Sun Effect in Home - + - 49 Autoists View Open Air Movies- =- + - 50 Radio Rod Locates Sunken Relics =- + + 52 Rural Radio Needs No B Batteries - + - 52 Portable X-ray Machine Is Speedy - += + 52 “Chisel” Plow Halts Soil Drift - + . - 56 Current Heats Wallpaper Steamer - =- - 58 New Parking Equipment Doubles Garage Space =- + + = + = += + = 62 Folding Ladder Fits Varied Needs - + - 66 Eye Ailments Cured by Dry Heat - - - 66 German Radio Has Novel Tuning Dial - - 67 Take-apart Comb Is Easily Cleaned - - - 67 Newest Golf Tee Spins When Hit - + - 67 Buy Your Popcorn “On the Cob” - + - 67 Auto Slingshot Loads Via Handle - + . 72 Sheriff Builds Pivot-Winged Plane - + -. 72 Organ Creates Photocell Music - + + =- 78 Round Hand Brush Drains Itself - =- = 79 Hand Gadget Sharpens Lawnmowers » = 80 Magnet Recovers Lost Oil Tools- - =- =- ‘81 New Vanity Case Holds Door Key - ¿»> - 81 Auto Seat Gives Infants Comfort - > =-+ 81 Heating Pad Is Made of Bronze - += + - 82 Science Invents Glass Blackboard - + + 87 Brush Holder Revolvesin Wall - » + «+ 87 Open Air Ford Has Back Seat Drive» =. - 87 New Cigaret Roller Fits Pocket- + + + 87 INTERESTING SCIENTIFIC ITEMS Rear Scaffold to Save Washington Monument 40 Smith Shows Amazing Strength - + = 40 Midget Tool Kit Fits Matchbox - + + + 50 Students Build Model Locomotive + + + 50 Coed Designs $2,000,000 Bridge =- e + 56 Dynamite Used to Study "Quakes - + + 56 How Streamlines Determine Speed - + - 58 Newsboy Is Walking Display Rack - + =- 58 Model Boats Race in Wading Pool -. - - 59 Ship on Wheels Scales Mountains - + - 59 Salvaged Film Saves Movies $1,000,000 - - 62 Shelter Anticipates Air Raids - - + - 66 Artist Designs Novel “Gallery” - - + + 72 (Continued on page 8) 6 Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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T PROVE in Only 7 Days that I Can Make YOU a New Man!” No other Physical Instructor in the World has ever DARED make such an Offer By CHARLES ATLAS Holder of the Title: “The World’s Most Perfectly Developed Man” Won in open competition in the only National and Inter- national contests held during the past 15 yeurs. HAVE proved to thousands that my system of building powerful, big-muscled men begins to show real results in only 7 days—and I can prove it to yout. 7 You don’t have to take my word for it. You don’t have to take the word of my hundreds of pupils who have added inches to their chests, biceps, neck, thighs and calves in only a few days. No sir! You can prove for yourself—in just one week— by the change you see and feel in your own body—that you can actually become a husky, healthy NEW MAN —a real “Atlas Champion.” All I want to know is: Where do you want big, powerful muscles? How many pounds of firm flesh do you want distributed over your body to fill you out? Where do you lack vitality, pep, and robust health? Where do yon want to take off flabby, surplus’ fat? Just tell me, give me a week, and Pll show you that I can make a New Man of you, give you bodily power and drive, and put you in that mag- nificent physical condition which wins you'the envy and respect of any man and the admiration of every woman. » .My own system of Dynamic-Tension does it. That’s the way I built myself from a 97-pound weakling to “The World’s Most Perfectly Developed Man.” And now you can have a big, balanced muscular development like mine in the same easy way. No “Apparatus” Needed ! _You begin to FEEL and SEE the difference in your physical condition at once, without using any tricky Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers weights or pulleys, any pills, “rays,” or unnatural dieting. My Dynamic-Tension is a nat- ural method of developing you inside and out. It not only makes you an “Atlas Champion,” but oes after such conditions as con- pation, pimples, skin blotches, id any other conditions that Keep you from really enjoying life and its good times—and it starts getting rid of them at once, . z Let Me Tell You How Gamble a stamp today by mail- ing the coupon for a free copy of my new illustrated book, “Ever. lasting Health and Strength.” It tells you all about my special Dynamic-Tension method, It shows you, from actual photos, how I have developed my pupils to the same perfectly balanced proportions of my own physique, Dy my own secret methods. What my system did for me, and these & hundreds of others, it can do for you too. Don’t keep on being only one-half of the man you can be! Find out: what I can do for you. Send for FREE BOO Where shall Isend te a CHARLES ATLAS, Dept. 6-M ag N i 115 East 23rd Street, : Strength’? Jot your New York City I want the proof that your system of Dynamic- Tension will make a New Man of me—give me a healthy, husky body and big muscle development. name’ and address down on the coupon, | and mail it today. Your own new “At- | las body” is wait- ing for you. This book tells you how | easy it is to get, my way. Send the | Name coupon to me per- sonally. I CHARLES ATLAS Address Dept. 6-M | (15 E, 23rd St. New York city T Charles Atlas— As He Is Today free book, “Everlasting Health and Strength.” ae es © 1934, C. A, Ltd. Photo by Joel Feder. Send me your

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Burlington's Diesel-powered “‘Zephyr’' used only $16.72 worth of fuel oil in its 1,015- mile non-stop run from Denver to Chicago “TABLE OF CONTENTS. (Continued from page 6) Light Ray Serves as Air Defense - - - 78 poe come Yacht on Wheels Furnishes Thrills - - - 78 R.R. Shatter-Proof Eyeglasses Tested - - >- 78 Liner’s Stack Holds 3 Locomotives - - - 79 Woman Tests Fireproot Suit - =- - - 79 Paris Opens Subway Auto Road - ~- -- 80 Isolates Million-Dollar Element - - + 80 “Mummy Seed” Grows Giant Wheat - + 81 Police Dog Rides Aquaplane - - - - 82 Back Yard Well Produces Gasoline - - - 82 in locomotives — ships — Industrial and commercial New Robot Solves Math Problems - - - 82 power plants — motor cars and trucks — aircraft — i actori, Age result. many old Jo bs have been greatly | changed or actually wiped out. New Jobs For Old RADIO SPARKS Every Industrial change throws many good jobs into the discard — but it creates m ore and better jobs. The R automobile ruined scores of industries based on pro- Spark Coil Power Supply From 6-V. Battery - 89 viding horse transportation — but the motor indastry employs even greater armios of workers. Radios sup- 5 Meter Wave M-M Transmitter - P - - 90 Planted falling machines adie rerrigerators By Th l ch d wrecke e iceman — air con oning IS driving ow old-fashioned heating and ventilating systems. y omas A. Blanchar Diesel Engineering Is the great opportunity of to- Voltmeter Measures Condenser Capacity - 92 day. The field is developing wlth amazing rapldity— on land and water and in the air. This Is your oppor- Gadgets Make Wire-handling Easy - a - 92 tunity fo get in on the ground Boor ola new a c l v l Y perous industry that will provide plenty of good jobs ontro. i - - ~ Ceara tee mat oltage Without Rheostat 92 Is Your Job Safe? i There ls 2 growing scarcity of men trained to Install, operate, and service Diesel engines. New Diesel Engl- FOR TH E WO RKSHOP FA N neering Course—just released for home study by onc of America's leading cducational institutions — will " : > give you, in a short time, thorough training in modern Chips From the Editor S Workbench - - 16 Diesel engine practice. All texts furnished. Send š s a aF TODAY for ae Bulletin. Ng obligation, Experimenting With Electricity merican scnoo : ~ e Dept.D-928, Drexel Avenue at 58th St., Chicago, Ils. Making Radio Crystals = ge te oe 63 T Signals for- Toy Trains - - - - - 93 Make Money at Blears Tine aihn ee 5 38 Grow our toman Fancy White Queen Reversing Switch for Small Motors = = 93 fushrooms. Exclusive new process, Bieger, better, guleker crops. a Use Battery to Cut.Glass - i = = - 93 money for you! normous new de- M a = = i mand. Ilustrated book free. Camera Kinks for Amateurs 94 Write today! F ey- i i 7 fs a x ” CeIn MORO Money-Making Suggestions 95 INDUSTRIES, LTD. Ford Generator Powers Drill Press - - - 98 Stop Sticking of Desk Drawers - - - - 98 Celluloid Sheet Is Grinding Mask - - - 98 Line Shaft Uses Ford Bearings - - ~- - 98 AT HOME You can learn by our Modern and orig Automobile Repair Hints - - - - - 102 inal system of instruction every part of the Watch i Repairing Trade at home as good or better than at Blackboard Desk for Children - - - ~- 106 a shop. You can earn money while learning and se- 7 cure a well paving position or start in business Test Tube Heater for Aquarium - - ~- 106 after completing our course of instruction. Goot qa 4 watch repairers are always in demand and earn About-the-Home Handikinks - . - - 108 very good salaries. For particulars apply to the : y MILWAUKEE SCHOOL OF WATCH REPAIRING Kitchen Desk Has Phone Niche - - - - 109 324 E. MASON ST." Dents e MI MIS: | Tempering Shop Tools sae ee 112 Any Man, or Boy, who has a Passion for Semi-Automatic Auto Clutch . = =- - = 113 Making Things Needs this Book Drive Power Tools With 1 Motor - .- - 113 Marre . > ki i IT'S ONLY A DIME Bearing Down on Breast Drill - .- - + 113 This book tells you how to make Electro-Magnets, Elec- troplating Outfits, Secret Locks . . . and 30 other Elec- trical Devices. You'll find the directions and diagrams easy to follow. Satisfactory too... because everything you make will work . . . 100%. Published monthly by Modern Mechanix Publishing Co., 529 So. 7th St., Minneapolis, Minn., U.S.A. Not responsible for unsolicited manuscripts. Contributions accompanied by in- sufficient postage will not be returned. Entered as Second Class matter Sept. 20th, 1928, at Minneapolis, Minn. Copy- right 1934. Advertising offices Chicago, 360 North Michigan 96 Pages—costs a Dime—Don’t go Ave.; New York, 52 Vanderbilt Ave. 15 cents a copy; $1.50 another day without it a year in U. S. and Possessions. In Canada, 20c a copy; You'll never get more real instruction for any dime $2.25 a year. Other Postal Unions, $2.00 a year. Printed you’ve ever spent than what’s crammed between in U.S.A. William J. Kostka, Editor; A. Neely Hall, Work- the covers of this book. Send 10 cents (coin or An ‘ eae stamps) to Dept. F.D.B. 1, National Carbon shop Expert; Robert Page Lincoln, Hunting and Fishing Company, Inc., New York City. Editor; S. S. Rabl, Naval Architect. 8 Thank You jor Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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For several years, he was just like a score of other men in the plant—a good, honest, fairly capable worker, but only that. There was nothing distinc- tive about him or his ability—nothing to make him stand out from the crowd—no reason, as a matter of fact, why he should ever receive a raise. Then one fortunate day he decided that the reason he wasn’t getting anywhere was because he lacked special training. He searched around a bit —asked a great many questions—and then en- rolled for a home-study course with the Inter- national Correspondence Schools. “Soon after I began studying,” he wrote to us the other day, “we had a change in management: at our plant. The new superintendent said that only men who had really studied their work were in line for positions as foremen. “I certainly was glad then that I had decided to study in my spare time. For, thanks to my I.C.S. course, I was the only man in the organization who could talk to the superintendent in his own lan- guage. As a result, I was promoted over men who had been here from ten to twenty years. What are you doing with the hours after supper? Can you afford to let them slip by unimproved when you can easily make them mean so much? One hour a day, spent with the I.C.S. in the quiet of your own home, will prepare you for suc- cess in the work you like best. Yes, it will? Put it up to us to prove it. Mail this coupon today. INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” BOX 2318, 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 Architect D Architectural Draftsman D Building Estimating O Wood Millworking U Contractor and Builder O Structural Draftsman O Structural Engineer 0 Taventing and Patenting O Electrical Engineer O Electrio Lighting O Welding, Electric and Gas D Reeding Shop Blueprints O Business Management O Office Management. D Industrial Management O Traffic Management O Accountancy DO Cost Accountant Name City... O Telegraph Engineer O Telephone Work Cl Mechanical Engineer CO Mechanical Draftsman .. O Machinist O Toolmaker O Patternmaker O Heat Treatment of Metals Q Bridge Engineer O Bridge and Building Foreman O Gas Engines ( Diesel Engines O Aviation Engines O Automobile Mechanic -D Plumbing O Steam Fitting O Heating D Ventilation O Sheet Metal Worker - D Steam Engineer O Steam Electric Engineer o pa Kamino ” Ur YOYING anc apping O Refrigeration O R. R. Locomotives OR. R. Section Foreman O R. R. Bridge and Building Foreman BUSINESS TRAINING COURSES OC. P. Accountant O Bookkeepin X O Secretarial Work OC Spanish O French O Salesmanship O Advertising A ge, +S EOEE..0. D Service Station Saleamanship D First Year College O Business Correspondence QO Lettering Show Carda O Signa O Stenography and Typing i D Civil Service ail Carrier „Address... .. Occupation... ne If you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada D Air Brakes OR. R. Signalman O Highwey Engineering -- O Chemistry O Pharmacy O Coal Mining Engineer O Navigation O Air Conditioning O Boilermaker O Textile Overseer or Supt. O Cotton Manufacturing O Woolen Manufacturing O Agriculture Q Fruit Growing | O Poultry Farming C Radio O Marine Engineer O Railway Mail Clerk O Grade School Subjects O High School Subjects D College Preparatory O Mustrating O Cartooning Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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NEW EASY WAY ADDS 9 to 15 LBS.—QUICK! DecroRs for years have prescribed yeast to build up health. But now ” with this new discovery you can get far greater tonic results than with ordinary yeast—regain health, and also put on pounds of firm flesh— and in a far shorter time. Not only are thousands quickly gaining solid, good-looking pounds, but also clear skin, freedom from indigestion and constipation, new abounding pep. This amazing new product, Ironized Yeast, is made from special brewers’ ale yeast imported from Europe, the richest yeast known, which by a new process is concentrated 7 times—made 7 times more powerful. But that is not all! This marvelous, health-building yeast is ironized with 3 kinds of strengthening iron. Day after day, as you take Ironized Yeast, watch flat chest develop, skinny limbs round out attractively. Skin clears, new health comes—you’re a new person, Results guaranteed No matter how skinny and weak you may be, this marvelous new Tronized Yeast should build you up in a few short weeks as it has thousands. If you are not delighted with the results of the very first package, your money back instantly. Special FREE offer! Purchase a package of Ironized Yeast at once, cut out the seal on box and mail to “ULL TELL YOU ue mith 2 nope of this paragraph We HOW TO will send you free a fascinating new boo! on health, “New Facts About Your Body”. GAIN POUNDS Remember, results are guaranteed with QUICK! the very first package—or money re- funded. At all druggists. Ironized Yeast Co., Inc., Dept. 5612, Atlanta, Ga. 10 Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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On Jobs Like These—No Correspondence Real Work on Radio & Television Equipment Train In Only 10 Weeks TELEVISION £ TALKING PICTURES in the Big Chicago Coyne Shops Do actual work on Radio equipment worth many thousands of dollars to qualify yourself for a big pay job. Learn radio wiring and testing, trouble shooting, repairing and servicing. All under individual in-. struction and only on the sort of work you will meet out in the field on a real job. All Actual Shop Work The remarkable “Learn by Doing” methods used in the great Coyne Shops train you to master radio and its many branchesin 10 weeks. Actual shop work—not a correspondence course—you don’thaveto recite. Instead you are trained by actual work in wonderful, modern daylight shops on the finest kind of Radio, Sound and Television equipment, under personal supervision of expert instructors, That’s yi ut rere Training prepares you as a real Radio Expert in sucha short time. You Need No Previous Experience or Higher Education to Succeed If you can understand simple English you can be trained the Coyne way—by actual experience ona wide variety of up-to-date A. C. Super- heterodyne sets, oscillators, analyzers, and test instruments. You learn how to operate television receiving and transmitting equipment, and how to install, test and service public address systems and sound picture equipment, Coyne training also prepares you for Amateur roadcast or Telegraph Radio Operators License, and to know allCode and Department of Commerce rules, for a Government License Examination, (100 EEE PAY COST OF TRAINING Siti NO RED TAPE— NO STRINGS TO MY OFFER—YOU RUN NO Your earnings on the job ag 2 Coyne Trained Graduate should make RISKI I'LL TRAIN YOU IN MY SHOPS FOR 90 DAYS—YOU GET it easy, I’m willing to back you in this way because hundreds of my OVER ONE YEAR TO PAY TUITION AFTER GRADUATION! successful graduates have proved to me that the fellow who wants Make your first payment 60 days after your 10 weeks Training period. toimprove himself and his conditions is the Anest credit risk in the And then take over a year to pay the balanceinsmalimonthly payments, world. Earn Living|ELECTRIC REFRIGERATION ‘cluded | Get This Expenses While] AIR CONDITIONING exracest/ EREE BOOK The fastest growing industries in America today. Manufacturers a a You're Training! Distributors of Refrigeretion and Air Conditioning equipment and Get the new Coyne OQpportumty Trained men who have Specialized in these rapidly expanding fields. tants abeat Coan Many of my students work part - Here at Coyne you will prepare to acts al out Coy ne time to help pay their living ex- fill a job as Installation and Serv- f & i Training. Photo- pengea wile they are traiting; ta ogo a l e F ssembler, Inspector, ete. You f È AE ETEA rement will learn about various types of RADIO at work on modern job to cover a good part of your room and board expenses, Students operating our modern Transmitter View of students operating our Television Camera and Scanning Unit compressors, condensers, temper- radio equipmer:t aturecontroldevices, thermostatic under the person- and expansion yalyes- you wilido al supervision of actual work on latest types of Re- Coyne Expert In- frigeration and Air Cenditionin structors, Also E m p 1 o y men t machines, And, it won't cost ean detailsofmy Spare one extra cent to get tms remark- f Time &mplo mt Offer. Pay After Help For You abletraining. lincludeicabsolute- | Graduation Plan and Graduate Em- Free with your regular Ragio f ployment Service, Yours witbout ing. cost.. Simply Mail the coupon. My Graduate fmployment Service § M AI L $ H. C. Lewis, President em will give you ‘real emplo: é atin help during your whole life. As } oyne Electrical School, Dept. 94- assistance quickly, and every help § we can give you to locate a job = N ow? for which you have been trained. § f 7 e E A 500 5. Paulina St., Chicago, : e Cc i : : one oF my Lear A Naat Ee oupon E Seno me your big FREE Book about Coyne l Training and give me all details regarding our ‘‘Spare Time Employment Offer’’ and f “Pay After Graduation Plan” ot easy, i monthly payments. H. C. LEWIS, President RADIO DIVISION: Founded 1899 COYNE ELECTRICAL SCHOOL! 500 S, Paulina St., Dept. 94-1H, Chicago, Ill. | 1 anaa STATE oramne Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 11

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The Book Opposite Contains Have you an invention—or an idea for one—that will save time, save labor, make money or give pleasure? If you have, this interesting, new FREE BOOK, was meant for you. It’s crammed full of practical, useful information that the man with an invention needs to know. Tells you facts like these: How the Patent Laws protect you and why, if you have an in- vention, you need a Patent at all; what a competent Patent Attorney can do for you; what kind of a sketch or model is needed; how to make a disclosure of your idea right away, to help establish your claims; how some suc- cessful inventors have secured financial assist- ance; tells about interesting inventions that have proved successful and shows you 115 different mechanical principles that inventors have used in working out ideas; also gives much other in- formation that every man who has an inven- tion—large or small—can use to his advantage and profit. Read what the inventors below say about this book. Then, if you have an inven- tion yourself—even though it is still in the rough or crude stages—write us for a copy. Our busi- ness is to help you if we possibly can, You'll welcome a book of facts like this. The Big Age of Invention Is Still Ahead Below is one of our newest trains. It’s the crack, streamlined express of the Union Pacific. Does 110 miles an hour. The whole train weighs only as much as a single, modern steel pullman car. This is only a glimpse of what’s ahead. Experts say that within the next ten years the railroads will have to be revolutionized. Henry Ford says that we're still living in the stage coach age. C. F. Kettering, Vice President of General Motors, says: “We're only entering the great period of inventive advancement.” Look around you. Every line of industry, every sphere of life, presents opportunity to the inventor. Ten years from now, you'll see a different world; a world in which the inventor has made big changes, changes just as revolutionary as this streamlined train is today. Men who are poor today will be big financial successes a few years from now, because of inventions. Many Little Ideas Have Big Commercial Possibilities In contrast to the train be- low, a big development, look at this recent invention, which is so simple that the average person is prompted to say: “‘Now, why didn't I think of that myself?’’ This invention is nothing more than a little metal strip, curved to fit par- tially around the neck and under the cap of an ordinary ginger ale or beer bottle. When pulled out at the bottom, it forces off the cap, ren- dering a bottle opener unnecessary. A worth while improvement and the inventor has a patent. Simple, but it has in it the possibility of tre- mendous sales and profits. be complicated to be valuable. Your first step, if you have an Invention, Is to get the facts about Patent Protection. We'll gladly supply them FREE to serious, interested men. WHAT INVENTORS SAY: One inventor writes: “I want to compliment you on the publication of a book so replete with infor- mation naturally of great interest to inventors.“ Another writes: “Your book sure is a wonderful guide for an inventor. I shall keep together the An invention needn't Dook and all references to have same on hand.’ Still another man says: “I have read your boolc Patent Protection thoroughly and I feel sure that whenever the need of information arises I will know how to proceed in order to patent any device that I may bappen to think of.” 12 Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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M WHO ARE INVENTORS? Some of the most successful in- Tenlions have come from men who. didn’t consider themselves inven- tors at all. A dentist invented the stock ticker; a bank clerk the hand-camera; a school teacher the telephone, and a farmer invented the typewriter. No matter who you are or what you do, if you hare an idea fur an invention that. will serve a useful pur- pose, you are entitled to your just reward and the Patent Laws are designed to protect the poor man and the rich man alike. But you must know haw to take advantage of them. Our book will tell you how. IMPORTANT With the book, we will also send you a FREE copy of our ‘Evidence of Inven- tlon’’ form, on which you can make a sketch end de- scription of your invention and establish a date of disclosure. Such a dated disclosure may later prove important to you. We send full instructions. Any let- ters, sketches, drawings or models you send us are held In STRICTEST SE- CRECY by us. You can write Us frankly. But first get a copy of this remark- able book. Of savin bee book appointment, Wy Sxpense, even | é with our con e'll ater dis- REGISTERED PATENT ATTORNEYS, 36 Years of Service MAIN OFFICE: 520-P, VICTOR BUILDING, I g pais firm was founded ave a third WASHINGTON, D. C. ola century ago. e have he ped thou- B : 1640.B C Building, Chicago; 1007-B Woolworth | sands of inventors protect their rights. E wes York; 514B Empire “building, Pittsburgh; 1010-B ae represent you personally before the Hobart Building, San Francisco; 736 Security Bldg., Los Angeles. ore oe ee Cenk eas Kindly send me FREE and without obligation, a copy of your book, Į quickly, economically, effectively. Our Patent Protection,’ and the “Evidence of Invention” form. 2 book also tells you about a three-pay- | ment fee plan that many inventors have Dane sega ss cs nascccus ct A cosas a vanes Cisus, gucaieteeraes ide caxeobsassnaiee found helpful. Write us a card, letter or send in the convenient coupon. De- Steet atid Now aiaia EENE EEA EAE ON i cide NOW to know the facts. Do that today. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 13

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Arc welder problems and other questions cleared up for readers. BUILDING THE ARC WELDER Here are some questions regarding the arc welder described in the October issue. In the Dodge generator fields there are two windings— starter of heavy flat wire and generator or inner coil of round wire. Are the starter windings re- moved and discarded? How many turns are need- ed in winding the special shunt coils? How many for the insert coils? What horsepower engine is needed to drive the generator? What t.p.m. is necessary for output of 80 amperes?—E.C.K., Greenfield, Mass. . Will you please let me know in what year the G or GA Dodge generators were used?—S.A.A., Los Angeles, Calif. Field coils on two of the generator poles are discarded entirely and new shunt coils, wound as described in the article, are sub- stituted. On the other two, the inner coils are discarded, while the outer or starter coils are retained. New insert coils, each containing 1 Ib. 21 S.C.E. wire, are slipped under the starter coils to replace the old insert coils. As stated, the number of turns is not important. It is common in welding generators to have poles of same polarity. A 1% h.p. electric or gasoline engine is the smallest which can be used with this direct current welding generator. Use belt and pulleys which will develop a generator speed of 1800 r.p.m. at no load for an out- put of approximately 80 amperes. - The G or GA generators recommended were used on the Dodge from late 1916 to 1926. : * x bo RECOVERING SILVER FROM HYPO Is it possible to recover silver from photographic hypo fixing baths?—J. F. B., Baltimore, Md. It is possible, but not practical, for ama- teurs to recover silver from hypo. Precipi- tants, purchased from photographic supply dealers, are put into the hypo. These collect the silver and are then sent to refineries. = * $ VARYING RADIO VOLUME When lights are switched on in my home the radio volume increases, When they are turned 14 off, it decreases. How can this be corrected?— E.S.C., Chicago. Electric house wiring often acts as an an- tenna. When the lights are switched on the length of the antenna is increased and the radio volume becomes greater. The solu- tion is a good antenna, shielded so that it will not pick up energy from wiring. X aK * LINING FOUNDRY FURNACE Is there a more durable material than fire clay that can be used for the lining of forges and foundry furnaces? —C.K.R., Los Angeles. The following mixture dries hard and will prove exceedingly strong once it has been glazed by the fire. By volume take 20 parts fire clay, 20 parts cast iron turnings or filings, 1 part common salt, and % part sal ammoniac. Thoroughly mix the mate- rials, then add water to the consistency of common mortar and apply with a trowel. bod * kad MAKING HECTOGRAPH GELATIN Tell me what material to use to refill my empty Hectograph gelatin duplicator.—H.N.C., Canyon, Calif. By weight, melt i part clean glue, 2 parts water, and 4 parts glycerine. Heat the mix- ture adding glue or glycerine until the proper consistency is reached. This can be determined by allowing a portion to cool. kod x * PREVENTING FROZEN PIPES IN HOUSE What procedure should be followed to prevent freezing in the plumbing when a house is unoccu- pied during the winter?—R.E.H., New York. Shut off the main supply valve.. Open all faucets and drain outlets. If there are no drain outlets, disconnect the supply pipe at the main supply valve to drain off all water under the lowest outlet fixture. Disconnect pipes that do not have sufficient slant to drain off water. Empty all flush boxes. Add kerosene or other oil to water in all traps to prevent freezing, avoid evaporation and the admission of sewer gas into the house. (Editor's Note—All letters sent to this department should include a stamped, addressed envelope. Write to M-M Problems Editor, 529 So. 7th St., Minneapolis, Minn.)

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START $1260 to $2100 a YEA Many U. S. Government Jobs for Men and Boys 18 to 50 Railway Postal Clerks—-Post Office Clerks—City Mail Carriers—Rural Mail Carriers—General Office Clerks—Liquor Gaugers—Bookkeepers—Customs Inspectors—Immigrant Inspectors A VERY DESIRABLE POSITION Railway Postal Clerks get $1900 the first year regular, being paid on the first and fifteenth of each month, $79.16 each pay day. Their pay is increased $100 and $150 a year. The maximum is $2700 a year, $112.50 each pay day. They get extra allowance for hotel expenses when away from home. PAID VACATIONS Railway Postal Clerks, like all Government employees, are given a yearly vacation of 15 working days (about 18 days). When on long runs they usually work 3 days and have 3 days off duty or in the same proportion. During this off time arid vacation, their pay continues just as though they were working. When they grow old, they are retired with a pension. As Railway Postal Clerks are continually traveling, they have an excellent chance to see the country. They are furnished with a railroad pass for official business. City Mail Carriers—Post Office Clerks : 7 FRANKLIN Clerks and Carriers get $1700 tho first year regular and automatically increase $100 a year L ` to ee with uriner. me DSTT S - to $2300. They also have ept. J-. , Railway Postal Clerks days’ vacation. / ROCHESTER, N. Y. What Will You Earn Ka Rush to me free of charge 2 (1) a full description of the 2 Erom Noy! 4°" position checked below; (2) Free a ce) copy of 32-page illustrated book ae yond Be Han “How to Get a United States Govern- a few years from ment Job”; (3) A list of United States now you will Q Government Jobs. e or [_ ] Railway Postal Clerk ....... (Start, $1,900} more a year, «Y p JPost Office Clerk ..... (Start, $1,700) year? sr (_ 1 City Mail Carrier . .. / [_ ] Stenographer-Typist ..... [_ ] Liquor Gauger—Storeskesper 7 i eea Inspector ....... ookkeeper / Many Winter Examinations Expected | Fill out the coupon. Tear it off and mail it to- / Name........ ee er ee ee ‘ day—now, at once. DO IT NOW. Z- aii aus aa E SR Use This Coupon Before You Mislay It—Write or Print Plalniy. Thank You jor Mentioning Modern Mechanix dnd Inventions for December When Writing to Advertisers 15

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Big $500 contests open to all MM readers. Here are some new members of MM’s boat fleet. Scooter wins first prize in Workbench contest. MacRobertson, Australian millionaire, sends letter and photo. Jack G. Moody won first prize of $5.00 for the photo of his Scooter (top left). Second prize went to Jack B. Major for the Lark Jr, he built for $12. It is shown at right. The streamlined motor ice sled brought third prize to W. R. Davison. ' VERY shop fan, handy man, and home lover should enter MM’s new $500 cash prize contests. We haven’t room to discuss details here, but we know every one of you has a good chance of winning one of the 56 prizes. Announcement and rules for the first of a series of four contests can be found on page 46. * * * In the Workbench’s own little contest, prizes this month were awarded to three good examples of fine workmanship. First prize of $5.00 goes to Jack G. Moody, the first reader to send in a photograph of the Scooter, which was explained in a how to build article in the August issue. Moody says: l Akron, O. Dear Editor: The scooter, planned for the small boy next door, was built from the plans in the August M.M. It is- painted silver and vermilion with a half inch black line separating the two colors, The arrows and striping were first cut from gummed paper, painted and then glued on, making a professional looking paint job. The construction cost amounted to only sev- enty-five cents. And is the little boy proud of it! Jack G. Moody. Another Jack, this time Jack B. Major, re- ceived second prize of $3.00 for his photo and letter. For $12 he built Lark Jr., the 16 13%4-foot outboard motor powered cabin cruiser, plans for which appeared in the October, 1933, issue. Here’s his letter: Little Rock, Ark, Dear Editor: I am sending you some snaps of Lark Jr. I built it last spring. It shows you what a A letter from MacRobertson (above), Australia’s cocoa magnate, complimented our Sept. MM story on the London- Melbourne air race he sponsored. Photo shows first prize. Modern Mechanix and

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, has these new members: 1. S. T. Dickinson’s Dorothy”; 2. Chas. H. Peer’s “Sea MM s BOAT FLEET Skeeter”; 3. L. R. Healy’s “Sunray”; 4. Sergt. R. Glerin’s “Tar Baby”; 5. Frank K. Owen's “Sunray”; 6. Fred Kahs’ “All Sorts”; 7, Joseph Bus’ “Monotype.” Send your boat photos and join the fleet. man can do with good old MM and twelve bucks. That is what it cost me less the motor. She will do eight to ten miles an hour right along. ` Jack B. Major. Blueprints for this midget cabin cruiser are now available for $2.00. * * * With the ice season right on our heels we couldn’t resist giving third prize of $2.00 to Wallace R. Davison’s excellent photo of his streamlined ice sled. He tells us: Minneapolis, Minn. Dear Editor: I am sending you a picture of my stream- lined ice sled which I built up out of an old Chev. chassis and reinforced with an X. It is powered with a supercharged Star motor and will do 60 miles an hour. Brakes, steer- ing wheel; and spring mounted runners give the riders a floating ride with comfort. and safety at all speeds. Wheels are interchange- able in place of the runners and it can be taken wherever I wish. Wallace R. Davison. + x * MWM’s boat fleet continues to grow in num- bers and popularity. Every month we re- ceive several letters and photos from ap- preciative readers who have built and are pleased with MM’s boats. A few of the Inventions for December photos are grouped in the composite pic- ture above. If we had space we’d quote all enthusiastic letters. Here are some excerpts: Frank K. Owen, St. Paul, Minn., says about his “Sunray”—*Had a great time sailing her. She handles very well.” Joseph Bus, Ham- tramck, Mich., about his “Monotype”—‘tIt is easy to handle and will outsail anything with the same sail spread or length of hull.” S. T. Dickinson, Evanston, Ill., about his “Doro- thy”—"She is a dandy little job. Powered with a Universal Flexifour 20 h.p., she makes about 10% m.p.h.” Charles H. Peer, Maplewood, N. J., about the “Sea Skeeter’’—"She has been on most every lake and stream in New Jersey. Every time we go on an outing Sea Skeeter is perched on top of old Lizzie and goes with us.” L. R. Healy, Yarmouth, Nova Scotia, about “Sunray’”—"Had a great deal of fun and pleas- ure building and sailing her and found your plans easy to follow.” Fred Kahs, Prince Bay, New York, about “All Sorts”—"This was my first attempt at boat building.” Sergt. R. Glenn, Rizal, Philippine Islands, about “Tar Baby” —She sure is a honey. Rough water, surf and wind, she takes them all nicely.” * * * Every month the Workbench awards three prizes for the best photos, accompa- nied by interesting letters, of the models, furniture, radios, boats, etc., built by MM readers. What have you to offer? 17

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The “NOSE-TEST” From the standpoint of evaporation there are two kinds of anti-freeze—the kind that boils away and the kind that does not boil away. There is no middle ground. Some boil-away anti- freezes, however, have been “treated” to “‘de- crease evaporation,” and many car owners may get the impression that such products are all- Winter, one-shot, non-evaporating anti-freeze. Such an impression would be wrong. For such anti-freezes boil off rapidly when the engine is operating at high speed. An easy way to make sure that you get an all-Winter, one-shot prod- uct is by the lack of odor. Eveready Prestone is absolutely odorless—all boil-away anti-freezes, on the other hand, have a noticeable odor. Guaranteed All-Winter Protection Don’t confuse Eveready Prestone with either glycerine or alcohol. Eveready Prestone is a one-shot, guaran- teed anti-freeze, that will not boil off. And Eveready Prestone is also your best defense against rusting and corrosion in your car’s cooling system. It protects against rust from & to 20 times longer than other anti-freezes, Play Safe—Save Money It costs very little to have the guaranteed protection against freeze-up and rust provided by Eveready Prestone. On Page 27 is a chart, showing exactly how much is needed to protect your car. Also on that page note the Eveready Prestone guarantee. TURN TO PAGE 27 18 2 Years J You can complete our y simplified High School Course at home in 2 years. jue all requirementa for col- lege entrance. business, and the prs resslons. Standard H. S. texta Diploma awarded, Separate subjects if desired. Send tor oP Eos Bulletin TODAY. No obligation. American School, Dpt. H-928, Drexel at 58, Chicago For Trained Auto Mechanics Step into Big Pay. Earn $35 to $75 a week, I train you in only 9 weeks at largest schools of kind in world. New practical shop plan. Learn with real tools... on real equipment. Write today for Big Free Oppor- tunity Book and Special Low Tuition Offer. ER Address school nearest you. EE MEVEY SCHOOLS, Dept. 11-12 Book Cleveland, 0. Kansas City, Mo. f A DAY Blow a Opportunity a ‘5 to? Mystery Cigar Lighter This New scientific marvel amazes everyone. CAL SUCCESSOR TO THE FLINT L: es og flint---no frictlon---a brand new ignition principle. Every demonstrationasale. Retail at 25c. Sample nickel plated with moneymakingsales plan25c, Gold, silver or chromium plated sample Tõe. AGEN Get detalis on this is monexmeker og al qag “t $18.00 Desk M-24 New Method Bidg.,Bradford, Pa, P Sampla . 250 AT LAST! A REAL POCKET RADIO æ Can actually be carried in pocket or purse! No tubes —batteries—nothing to wear out. Simply clip to ANYTHING made of metal for clear toned reception | One control—gets all stations 50 to 100 miles, Short wave & police calls also! No aerial or complicated wires needed! Proven coast tocoast reception in tests | Foolproof—an@ practical—great novelty. Can ba used ANYWHERE while walking, riding, etc.! Complete with tiny phone. Nothing else to buy. Send only $1.00 and pay postman $1.95 plus postage or send $2.99 (M.O., Currency, Check). Sent p.pd., in 48 hours, Complete Ins., Included. Guaranteed. Order nowt TINYTONE RADIO CO. Dept. M For Boat, Auto Racer, Radio Plans Get Modern Mechanix’ 1934 How-to-Build-It q| 12Lighters $1.75 Kearney, Nebr. No talent or experlence Decesnart. Fascinating work. Pays big bean léte jnetruction book feliz about: et to ore, How. Paints, SI w Board and Wall / Signs, Ready made ie otters Gilding, Tricks of a » algo gives 100 Alphab ats and Do- Book bound In flexible int. leather- fi gr edges, and four bail baarin ard £4 ‘ens. Sent poatpald $3.00..C. EDS Do ocer: i Ogtivle Pub, Co., 57 Poar St. De a RY. Clly Ww EARN MONEY /MMEDIATELY=~“ WE FURNISH EQUIPMENT TO START ”’ i MAKE ‘owe ELECTRIC DRILL rom Model T Ford Gerierator, 1 7 ma Oto % inch Capacity. We fur- . nish all other parts for. ` Compares with any $45.00 Drill.’ "Moderate speed permits more uses than ordinary Drills. Operates on 110 Volts AC or DC or 32 Volts. Same as used in our workshop, and guaran- teed sig iaciaes, Write for picture and complete description. RAND CO, Dent. 201 2004 Grand Ave., Kansas City, Mo. Make money taking pictures. ‘Prepare “aulekly during s spare | time. Also garn white you learn, No experience necessa asy meth Noth- POTO like it. Send at once for froe book. O PORTUNT TES IN MODERN OTOGRAPHV, AMERICAN SCHOOL OF PHOTOGRAPHY Dépt. 2059, 3601 Michigan Avenuş Chicago, U. S, As Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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his HELLO BOYS! Can you think of any- a thing you can own that will give you so much thrilling fun as Erector? Just listen to this. With Erector you can build a trench digger— with a real electric motor in it—and make it work just like the ones you see on the highways. You can construct motor trucks, fire engines, aeroplanes, locomotives. Put them together— piece by piece—with your own hands. You can build drawbridges that actually open and close —a towering ship crane such as used in Uncle Sam’s Navy Yards—a mighty hoisting engine—and dozens of other thrilling engineering marvels . . . Then you can hook up the powerful Erector electrice motor and make them hum with action. You are a full-fledged engineer when you have an Erector—because Erector is just like real engineering. TUNE IN “THRILLS OF TOMORROW” —Follow “Spike” Butler in his hair-raising adventures. NBC—WEAF net- work, Fridays, 6:00 P, M. See your local news- paper for other NBC stations. FIRST PRIZE WINNER LAST YEAR—Here is Eugene White, ` Jr. of West Fair- . view, Penna, with marvelous model of an electric crane and shovel that captured first prize in the. 1934 Erector Contest. Look! It’s as big as he is. Eugene had his choice of a free trip to any place: in the United States, but decided to use the money towards a college education. YOU BUILD LIKE A REAL ENGINEER WHEN YOU BUILD WITH ERECTOR In background, a traveling magnetic crane in a steel mill that will lift 742 tons of metal at once. Foreground, the trav- eling magnetic crane ' made with the New a Erector No. 7% set. THE NEW ERECTOR SENSA- TIONAL NO. 7 SET—Contains the powerful Gilbert 110-volt motor, all-purpose gear box, gir- ders, gears and other real engi- neering parts for building over 150 action models. Erector Sets start at $1.00. Be sure to see the Famous No. 4—the “Super-6” Erector—and the sensational No. 7. HERE’S YOUR CHANCE TO WIN A BRAND NEW CAR OR OTHER VALUABLE PRIZE! How Eugene White, Jr., won his exciting prize is a real, true story. Now you can do the same. This year I am having another Erector Contest—with better prizes than before. First prize is a Chevrolet auto. Then there are bicycles, cameras—a total of 1001 thrilling awards. So right now, do these two things. First, mail the coupon below, and I'll see that you get my big illustrated ‘Look- ’em-over” Book and an entry blank for the prize contest. Then go to the nearest toy store and pick out the Erector you want. Take your Dad along. He'll want to share in the fun ... And good luck in my big prize contest. _ AG Your friend, oes FREE—Clip the Coupon Mr. A. C. Gilbert, The A. C. Gilbert Company, 418 Erector Square, New Haven, Conn. Send me the big colored Erector “Look-’em-over” Book and entry blank for the Erector Prize Contest—both free. Nam erena givers iiaae a ieee Sw waders AANT wwe AGAVESS: ven.gs Sock ae SES Ae CeO TSR eR SARS CHORES CIOS is eraiartvarsiivaynpire dundee E E Seats. ooreo Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 19

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INVENTORS and MECHANICAL MINDED MEN Can you answer these questions? 1. Why should an inventor secure a patent on his invention? 2. Can you name 3 inventors to whom. more than 500 patents were issued? = Whodiscovered vulcanization of rub- ber? (2) Dynamite? (3) Lithography? . X-Ray? Why should an inventor not attempt io ‘obtain his own patent? 5. Can you name some inventions and discoveries which have been made in- dependently by two or more persons? When should an inventor disclose his invention to a manufacturer? 7. Need the attorney’s fees in a patent matter be paid in a lump sum? 8. Does an inventor have to appear at Washington to get a patent? 9. What great invention was made out of a macaroni box? 10. What great step of progress, besides the invention of the cotton gin, is credit- ed to Eli Whitney? For the answer to these questions and other information of value to you, look on page 146 Become a Radio Expe. learn RADIOTELEVISION ELECTRICITY- TALKING PICTURES "Times are getting better. Trained men are getting jobs. National will quickly train you to qualify in all branches of radio, television, talking pictures, broadcasting, operating and general electricity. Thorough, practical training. Over $100,000 in modern equipment. Natlonal graduates in demand. Regardless of age or education you ean learn profitable trades in a few months. QUALIFY ASA EARN ROOM AND BOARD WHILE LEARNING Radlo R Ir M 75% of our students earn living expenses while aalo Repair man receiving lraining. We help you get a job. For Televiston Expert limiled time will allow your coach railroad fare Control Operator 3 to Los Angeles. Station Technlelan TRAIN IN LOS ANGELES Sound Expert 4 This is the Ideal City. Center of Greatest Ac- Ship Operator tivity in Radio, Talking Picture and Electricity. Broadcaster 30,000 successful graduates. School established Electriclan 29 years. Send for free descriptive book and and many other jobs enrollment details. Dept. MMR-12 4006 Figueroa St. Send Book and full details of Courses. EASY WITH A Boy! It’s great to be pop- ular! All the big thrills of life are yours with your | P-A Sax! And all so easy. Many play - tunes first week; join a band in three months, with a free blowing, tone eure, P-A Sex, Trumpet, Trombone, or Clarinet. See your localP-A Dealer, : Or write for free booklet. No obliga- tion. Easyterms. Big opportunities in music today. Get started NOW! nss PAN-AMERICAN 3386 1230 Pan-American Bldg., ELKHART, IND. fy) The Midget “Five-in-One,” Slide Rulo is a combination Mannheim, Polymetric Log- Log, Binary, Add and Subtract Slide Rule, It will instantly add, subtract, multiply and divide any combination of whole numbers, frac~ | tions, mixed numbers and decimala. Giveseveryraot and power, also Logs, Sines and Tangents. Bde of aluminum with scales on white celluloid enamel. Size 4in. Approved and adopted by colleges. Price with instructiona and Fabrikoid gase $2.00. With leather case $2.50 t C. O. D. If desired. Catalogue Free. M. Tavella Sales Co., 23 West Broadway, New York broadcasting, aviation and EN GI N EER I N G, police radio, servicing, marine radio telegraphy and telephony, Morse telegraphy and rail- way accounting taught thoroughly. Engineering course of nine months’ duration equivalent to three years of college radio work. School est. 1874. All expenses low. Catalog free. DODGE’S INSTITUTE Fern St. Valparaiso, Indiana CA RTOON YOUR WAY SUCCESS! J 55) Ske COPY - LEARN TO ORIGINATE! RAYE BURNS will teach you HOW to CREATE ORIGINAL CARTOONS at home that you can 85 SELL! Course has 26 lessons and 600 lustrations, Send name and address for free details. Y= noe RAYE BURNS SCHOOL. Dept. F-X Box A CLEVELAND, "OHIO Learn to Dance You can learn all the modern dances—the latest Tango stepa, the new Fox Trots, dreamy Waltzes, smart Collegiate Steps, and popular Society Steps et home,easily and quickly. New chart method makes dancing ag simple as A-B-C. No music or partner required, Don't be a wallflower. Learn to dance.Complete course—256 pages, 54 illustrations, sent on 6 Daya’ Free Trial. Equals $20.00 course. Send no money. Pay postman only $1.98, „plun postage Upon arrival. oney back if not delighted, Catalog Free. Franklin Pub. Co., 800 No. Clark St.. Dept. A328, Chicago Be A Detective Big Money Opportunities Everywhere—No special edu- cation required. Complete course by mail. Cost amaz- ingly low. Write for free information. LEE SCHOOL OF DETECTIVES 305 South Western Avenue, Dept. MM-1 Los Angeles, California METAL-WORKING LATHE Precision equipment for the small shop. New designs and manufac- & turing processes make this amazing bargain possible. Complete metal-working lathe with com oud slide-rest. §-jaw chucking device: 6’' swing; th, 20lbs. Send $1.00. Balanco pion postage C. O D be paee live: trated Instruction book EE each order. Catalog free, complete line low-priced power tools. Attachments for milling, grinding, sanding, saw-table, etc., available at low prices. ad at once and have a complete machine shop. AMERICAN MACHINE & FOOL CO. Dept. X Order from 200 Broadway, New York 20 Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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Were talking to parents, espe- cially those who, regardless of present circumstances, had made no serious plans for their sons going to college after high school graduation. What we have to say will also interest parents who made plans but have seen them shattered by unforeseen forces. There was a time when a boy could step from high school graduation into a job, The boy who does it today is fortunate indeed, The inability to do it is not always a reflection on his ambition or his ability. In many cases the job is not there, The economic horizon is bright- ening—there’s no doubt about that—but there are millions of trained men, with families de- pendent upon them, waiting to fill jobs as they materialize, All the organized forces of society WHAT WILL YOUR SON DO NOW? and government are working to solve the unemployment problem. At the moment it’s a serious outlook—and a sad one for the boy. He is willing to work but cannot find work to do. He is at the peak of his energy and his enthusiasm. Shall he begin life in bitterness, or in brooding over his fate, or make associates and acquire habits that would have never tempted him in normal times? Your greatest responsibility to that boy is Topay! He needs your advice and your guidance more than he ever needed it before. Why not, then, encourage him to devote a systematic portion of his spare time to the study of | something which will engage his thoughts and—more important —give him training which will be of inestimable benefit to him in the years ahead? This study can give him a new vision of life, inspire him to greater achievements. Apprenticeship is still necessary, but employers prefer young men whose attitude and preliminary training qualify them to adapt themselves readily to the employer’s needs. The International Correspon- dence Schools, the largest and oldest institution of its kind in the world, have been providing ambitious men with the training they needed for over forty years, The boy just out of high school is ideally prepared for study of any of our 300 courses. If you'd like, one of our vocational coun- sellors will discuss—fersonally — your boy’s problem with you and him. This coupon, marked and mailed, will bring complete infor- mation—absolutely free! Study the coupon—it may be the be- ginning of a useful career for your son. Mish EV lad President INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” BOX 2317, 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:. D Architect O Architectural Draftsman D Building Estimating O Wood Millworking Q Contractor and Builder O Structural Draftamen O Structural Engineer D Inventing end Patenting O Electrical Engineer O Electric Lighting O Welding, Electric and Gas O Reading Shop Blueprints O Business Management O Office Management O Industrial Management UO Trafic Management. O Accountancy O Cost Accountant TECHNICAL AND INDUSTRIAL COURSES D Telegraph Engineer D Telephone Work O Mechanical Engineer Mechanical Draftsman O Machinist O Toolmaker UO Patteramaker O Heat Treatment of Metals O Bridge Engineer O Bridge and Building Foreman O Gas Engines O Diesel Engines D Aviation Engines O Automobile Mechanic O Plumbing [O Steam Fitting O Heating O Ventilation O Sheet Metal Worker D Steam Engineer D Steam Electric Engineer D Civil Engineer D Surveying and Mapping O Refrigeration OR. R. Locomotives O R. R. Section Foreman OR. R. Bridge and Building Foreman BUSINESS TRAINING COURSES OC. P. Accountant O Bookkeeping D Secretarial Work UO Spanish DO French D Salesmanship O Advertising O Service Station Salesmanship O First Year College © Business Correspondence O Lettering Show Carde oO Stenography and Typing O Civi! Service O Mail Carrier O Signs ` D Air Brakes DR. R. Signalman O Highwey,Engineering D Chemistry O Pharmacy O Coal Mining Engineer O Navigation O Air Conditioning O Boilermaker O Textile Overseer or Supt. O Cotton Manufacturing O Woolen Manufacturing O Agriculture O Fruit Growing O Poultry Farming D Radio D Marine Engineer O Railway Mail Clerk O Grade School Subjecta DO High School Subjecta College Preparatory U Illustrating D Cartooning in E Cbisiecsncsssicsuse BERE Co t La E E ET P EEEE E CE. sorrsevevnns E E A sibacees sei EGER A E a aiaia risia Occupation... asaasdaegadassaestaaeseaza daraa oust If you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 21

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NEW “HOME FACTORY” MAKES i PERFECT POTATO CHIP DONUTS—SALTED NUTS Stop looking for something difficult. Turn potatoes into cash, I show you just how with my newly perfecied outfit. Start anywhere. Very little cash needed. Exclusive location. Profits pour in. No experience necded. I fur- nish the plans. Begin anywherc—village, small town, city or suburb. A big opportuni- ty is waiting. Business permanent. MAKE UP TO 500% PROFIT ON RAW MATERIALS Naw materials are plentiful and cheap. High- ly perfected outfit and confidential plans make operation simple, with startling profits certain. WE HELP FINANCE YOU and. locate you. Send no money, just name, for book of facts and free opportunity. 1242-S. High St. Springfleld, Ohio Why don't you get into this able new line-replacing old-fashioned heating and ventilating systems In factories, ces, homes, etc., with modern air condl- ti ping equipment? — and platining new N pulldings for air conditlonlng? Architects sand Dullders — heating and ventilating ex- Petts —XSsteamfitters and plumbers — must meet this in Feasing demand for ways of Controlli g Winter ~ and Summer Made-to-order weather adds much to the comfort, health, and happiness‘9f humanity.. Alr-conditioned working quartets material- ly reduce lost time due to !IIhegs and in- crease employe efficiency — air-co homes insure comfortable inside te tures regardless of the weather and cut Ry T ent, Ittoned doctors" bills—alr-conditioned apartm bring increased rentals that soon pay fo the Installation. 4 Alr Condltionlng offers you a real change to get into a new and growing line where good-paying Jobs are constantly opgrting up. Like the auto and radlo, this,ngw de- velopment Is sweeping the cgunfry and revolutionizing Industry. ? What is the “Trade-In” Value of Your Preseht/Job? When changing condyions threaten to wipe out your present Jo , it's up to you to fit yourself for somf ing glse that will con- tinue to provide well-paid employment during your working life. Usually a little additional,informaflon will adapt your experienge to one, of the new jobs — often offering more money and brighter pros- pects’ Don't wait until your job ls kicked ou from unaa, you— meet the changes as ey come and ride the wave of progress to better times. 43 our Air Conditioning Course will give you by home study, In a short time, thorough and up- to-date t in this profitable new line. Al? texts furnished—small monthly payments. Send TODAY for Free Balletin. No obligation. American School Dept. AC928, Drexel Ave. at 58th St., Chicago Newly perfected, rapid,- direct-to-fat slicer with outfit at no exira charge. LONG-EAKINS COMPANY NEW CLEANS AUTO War! STRANGE MUIS y; CHEMICAL SPONGE Revolutionary inventlon cleans autos like magic! Ban- ishes dust, dirt, grease, traffic film—thanks to secret chemi- cal and sensational, self-suds- ing feature. Also cleans lino- leum, woodwork and windows without work! Auto owners and housewives wild about this strange chemical sponget SAMPLE OFFERI Samples sent at our risk to first person in each local- sk PRBE ity who writes. No obligation. Be | Writetoday forall details. first—send your name to ul KRISTEE MFG. CO., 2442 Bar Street, Akron, Ohio - ART LESSONS (‘ges ` van’ w > AGENTS! MAKE BIG MONEY! New, easy plan. Simply show and take orders. No needed. OUTFIT. Become Talented Artist with Big Income Post This thorough home-study Course teaches Com- PAID mercial Art, Cartooning, Lettering--anatomy, per- spective, adv. layout, short cuts, tricks of profession, f ete. By Alexander Murray, famous Art School Inatruc- | COURSE tor, Natural ability not necessary. Over 615 clear, COMPLETE A conclse instruction plates assure easy, rapid develop- LNA ment. 125 sheets of drawing paper included FREE, ` Complete Course (no more to pay) only $1.95 post- Daid--or send no money, pay postman plus postage. Money back if not delighted after inspecting. Turn vour spara time of today Into blg money tomorrow, . RACINE, WIS. DUCATIONAL SUPPLY CO. Dept. 110-M NEW Dual Ray HEALTH LAMP UNIT memes 7 7 ULTRA VIOLET AND Complete INFRA RED RAY IN: with - ONE LAMP. Goggles Only Mealth giving. Prevents o| Rickets and Skin disor- g 50 ders. Gives Sun-tan—Vl- | tamin “D”. Automatic = i safety control. 110 Volt AC or DC. Free Details. g BEYER MFG. CO. for Christmas .. . | Modern Mechanix and Inventions One Year’s Subscription Other Gifts for Shop Fans 1935 Handy Man’s Home Manual.......... g 50 1934 How-to-Build-It ................0005. How to Build 20 Boats............-..--5-- Mail Coupon NOW! rs er ee Se ee a e l Modern Mechanix Publishing Co., 529 S. 7th St., Minneapolis, Minn. | Please send: 1 1935 Handy Man’s Manual O How to Build 20 Boats Q 1934 How-to-Build-It Oo Year’s subscription to Modern Mechanix and Inventions O and special gift card to J Enclosed please find: 50e O $1.50 0 From: Thank You for Mentioning Modern Mechanix and Inventions jor December When Writing to Advertisers

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Speechless..When a Few Words Would Have Made Me! But now I can face the largest audience without a trace of stage fright HE annual banquet of our Asso- men in the industry present—and without a word of warning the Chairman called on me to speak—and my mind went blank! I half rose from my seat, bowed awk- ciation—the biggest wardly and mumbled, “Pm afraid you'll have to excuse me today,” and dropped back in my chair. Speechless—when a few words would have made me! The opportu- nity I had been waiting for all my life—and I had thrown it away! If I could have made a sim- ple little speech—giving my opinion of trade con- drtions in a concise, witty, interesting way, I know I would have been made for life! _Always I have been a victim of paralyzing stage fright. Because of my timidity, my diffi- dence, I was just a no- body, with no knack of im- Pressing others——of putting myself across. No matter how hard I worked, it all went for nothing—I could never win the big positions, the important offices, simply De- industry. stage fright, What 20 Minutes a Day Will Show You How to talk before your club cr lodge How to address board meetings How to propose and respond to toasts How to make a political speech How to tell entertaining stories How to make aftor-dioner speechos How to converse Interestingly How to write better letters How to sell more goods How to train your memory How to enlarge your vocabulary How to overcome stage fright How to develop self confidence How to acquire a winning per- sonality How to strengthen your will- power and ambition How to become a elear, accurate thinker How to develop your power uf concentration Ho'y to be the Á ? master of any situation Today I am one of the biggest men in our Scarcely a meeting or banquet is held without my being asked to speak. My real ability, which was hidden so long by is now recognized by everyone. I am asked to conferences, banquets as a popular after-dinner speaker, luncheons and This amazing training has made me into a self-confi- dent aggressive talker—an casy, versatile conversation- alist—almost overnight. E * No matter what work you are now doing or what may be your station in life; no matter how timid and self- conscious you now are when called upon to speak, you can quickly bring out your natural ability and become a powerful speaker. Now, through an amazing new homa study training you can quickly shape yourself into an outstanding influential spenker, able to dominate one man or fire thousand. In 20 Minutes a Day ' This new method is so delightfully simple and easy that you ean not fail to pro- gress rapidly. Right from the start you will find that it is becoming easier and easler to express yourself. Thousands hare proved that by spending only 20 minutes cause I was tongue tied in public. And then like magie I discovered how to overcome my stage fright—and I was amazed to learn that I aetually had a natural gift for public speaking. With the aid of a splendid new method, I rapidly developed thls glft, until, in a ridiculously short time, I was able to face giant audiences—without a trace of stago fright! Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers a day in the privacy of their own homes they can acqulre the ability to speak so easily and quickly that they are amazed at the great improvement in themselves. Send for this Amazing Booklet This new method of training is fully de- scribed in a very interesting and informative booklet which is now being sent to everyone mailing the coupon below. This booklet is called How to Work Wonders with Words. In it you are told how thls new, easy method will enable you to conquer stage fright, self- consciousness, timidily, bashfulness and fear. Not only men who have made millons but thousands of others have sent for this booklet and are unstinting in their praise of it. You are told how you can bring out and develop your priceless ‘‘hidden knack’’—the natural gift within you—which will win you advance- ment in position and salary, popularity, social standing, power and real success, You can obtain your copy absolutely free by send- ing the coupon. 3 Now Sent /g2%% ROTAS FREE NORTH AMERICAN INSTITUTE 3601 Michigan Ave. Dept. 2059 Chicago, Illinois SESDRACHANTECAAGEOCDGNEZHICANSNANEOUDENCHO North American Institute, 3601 Michigan Avenue, Dept. 2059, Chicago, Ill, Please send me FREE and without ob- ligalion my copy of your inspiring booklet, How to Work Wonders with Words, and full information regarding your course in Effective Speaking. uns > a = 2 3 a a 23

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GIVEN WITHOUT COST .. Over 300 Dandy Big Prizes 2/7 Including a Speedy Motorbike! H, BOY! Here’s your opportunity to win over 300 big prizes without cost? Get this 1934 deluxe model motorbike, fully equipped. Win a printing press, open a shop of your own, and make money. Or get this radio microphone and go on the air! Heaps of fun. . .. Besides these wonderful prizes, you can earn CASH PROFITS. It’s easy! Just deliver 3 fine í magazines to customers in your neigh- borhood.. No experience necessary. Mail .the coupon NOW —and we'll start you! You'll have lots of fun studying the moon, stars, birds, and wil life with this telescope. Ten power, Mail the coupon right away, and start winning it. m Jim Thayer, Dept. 442 The Crowell Publishing Co., Springfield, Ohio Dear Jim: I want to earn MONEY and PRIZES. Start me at once, and send me a big Prize Book, showing over 300 prizes that I can win. Name... “A Funny Way” to Make Muscles Grow! Most fellows think it takes a lot of strenuous exercise to develop BIG MUSCLES. But here’s a wonderful new way to make them GROW in double-quick time. fees iE} Bi 3 1 ft T | 5 sections, brass bound. 5 10-mile range. . Study Ig 2 ° € escope Moon, Stars and dis- tant objects with this powerful 8-x instrument. ‘Special eye piece for viewing Sun included FREE. Makes an ideal Micro- Scope; Guaranteed. Big value. Postpaid $1.75. C. O. D. 15e extra, BENNER & COMPANY, T-75, TRENTON, N. J. LIFE @ ACCIDENT: PROTECTION AT::: MIRACLE EXPANSION The New Short-Cut to Health, Strength, Muscles No wonder men are amazed when they see how my new method makes muscles grow—in less time and with less effort than they ever thought possible. Let me show YOU how I cau cover Amazing New DAY per $1,000. Pays up to $2,000.00 for NATURAL or ACCIDENTAL DEATH. Issued with a big Rellable State Chartered Company. Benefit does NOT decrease as you grow older. Age limits, 11 to 80. No Medical Examination. Certificate sent on FREE APPROVAL, without cost or obligation, Just send your name, address, age and Boneficiary’s name, PAY YOTHING, Write now, 5 INTERSTATE AID ASSN., Desk M-3, 75 E, Wacker Drive, CHICAGO, ILL, your body with bulging bands No OPEN A of strength—broaden your shoul- experience ders, deepen your chest, give you necessary KEY-MAKING SHOP! Start a business of your own. In- slructions fur- nished. The only key machine that cuts ALL types of keys. No hand - filing. Make first keys by number of lock without takling lock apart. Frite for FREE Circular. a mighty pair of biceps. I'll strengthen your internalorgans, too, fill you cheek full of health and energy. You'll beastonlshed the way your whole body responds to thls new, wonder method. TRY this New Way Here’s my sensational offer to you: Send me your name, ad- dress and FIFTY CENTS and I'll start you on “MIRACLE EXPANSION” by return mail. Follow my easy, fascinat- ing instructions for a week. They require just a few minutes a day. If you’re not delighted with results, back comes your money. I’ll give you a NEW BODY or no cost. Send 50e TODAY. Address a W. HARRY TITUS Beisser Manufacturing Co. pert% Siert Ss. a. 39 Union Square West W-12 New York, N. Y. | aS 9A, Thank You for Mentioning Modern Mechanix and I nventions for December When Writing to Advertisers

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They k broadly for my benefit. “Shi? he hissed in a loud stage-whisper. ‘This is going to be the big turning point in Frank Parker's life! He’s writing for a book that tells how to get into salesmanship. Pretty soon he'll be earning so much that he'll make the rest of us look like plkers!’’ Fa snickered. ‘Won't it be grand!” he grinned. “Now he can quit punching time-clocks and eating 25-cent lunches.” He raised his volce. ‘‘Drop ie a postal sometime when you get out into blg business and start making $5,000 or $6,000 a year, will you, Frank?” They both laughed uproarlously. And probably it did seem like a joke to them that a $25 a week clerk would have the nerve to think he could ever get anywhere or make rea] money without some special “gift? or ‘‘pull.”” But they laughed too soon. Just yesterday I sat down and wrote to Ed who is still at the shop, dragging along at the same old job. “Dear Ed’’—I wrote. “You asked me to send you a card when I ‘got into big business and started making real money.’ Well, here’s your card. Yesterday I was promoted to the job of assistant Sales Manager of the Western Metal Works, at a salary that goes with it, I'll loan you my copy of that book on salesmanship you used to think was such a joke.” Only a book! Just seven ounces of paper and printers’ Ink—but it contains one of the most virid and inspiring messages that any ambitious man can read, It reveals the real truth about the art of selling, explains the science of selling in simple terms, and tells exactly how the great sales records of nationally-known star sales- men are achieved And not only that—it outlines a simple plan that will enable almost any man to master scientifc salesmanship without spending a moment on the road—without losing # day or a dollar from his present position. s A Few Weeks—Then Bigger Pay Reason it out for yourself. Salesmanship offers bigger returns and delivers them quicker than any other line of work under the sun. But many people have subscribed to the foolish notion that a man has to be ‘‘born’’ with some sort of ‘‘gift’’ for salesmanship. Nothing could be farther from the truth Just like any other pro- fession, salesmanship is gnverned by certain fundamental rules Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers — National Salesmen’s Training Assn., Dept. W-707, N. S. T. A. Bldg., | Chicago, II. Without cost or obligation you may send me your free book, “The Key to Master Salesmanship.’* | | | | | l l m e a n a p oea ee i D B © Laughed When I Mailed This Coupon .. But It Brought Me The Book That Showed Me How to Make Over $5,000 a Year! S 1 walked up to the mail boz, Joe nudged Ed and winked and laws—laws which you can master as easily as you learned the alphabet. Right now an unusual demand for salesmen is being reported. City and traveling sales positions ate open in nearly every line all over the country. Every month more calls for trained men are Teceived. This employment service is free io both employers and employees, and thousands have secured excellent positions this way. Free to Every Man See for yourself why “The Key to Master Salesmanship’” has been the deciding factor in the careers of so many men who are now Making $4,000 to $10,000 a year. See how J. W. Haulman, of Baltimore, Md., used his N.S.T.A, Training io more than double his income—in splte of “hard times.” Find out how H. A. Lamy, af Montreal, Canada, first doubled and later tripled his income. Learn for yourself the REAL truth about the art of selling! If we were asking $2 or $3 a copy you might hesitate. But the book is now FREE. You do not risk one penny nor incur the slightest obligation, And since it may alter your entire future, it certainly is worth your time to fill oul and clip the coupon at the top of this page. Why nob do it now! National Salesmen’s Training Association “Salesmanship Headquarters Since 1907” Dept. W-707 N.S.T.A. Bidg. Chicago, If. Where Shall We Send Your Copy—FREE ! MAIL COUPON ABOVE TODAY 25

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SAME LOW ` PRICE! 2.95 Per gallon Play safe this year with 4 EVEREADY PRESTONE THE GUARANTEED ANTI-FREEZE One suor of Eveready Prestone... put in now... will keep your car safe. For every drop of Eveready Prestone is protection from both freeze-up and rust. ~- At $2.95 a gallon Eveready Prestone is ALL ANTI-FREEZE,:.no water... no dilution of any kind. Make the Nose Test: Eveready Prestone, truly non-evaporating, is odorless. «| - But “boil-away” anti-freezes can always be identified by a noticeable odor. = Regardless of special “treatments,” claimed to decrease evaporation, they will evaporate-rapidly when the engine runs at high speeds. A SPECIFIC GUARANTEE National Carbon Company, Inc., spe- ish, or to the metal or rubber parts cifically guarantees that Eveready Prestone, used according to direc- tions, will protect the cooling system of your car against freezing and clog- ging from rust formations for a whole Winter; also that it will not boil away, will not cause any damage to car fin- of the cooling system, and that it will not leak out of a cooling system tight enough to hold water. National Car- bon Company, Inc., General Offices, New York, N. Y. Unit of Union Carbide [gj and Carbon Corpora- tion. IT’S ALL ANTI-FREEZE...NO WATER BOILING HOT on a cake of ice! T SEEMS like black magic to some, but—a pan of clear liquid will boil merrily if placed on a cake of ice. Of course, the liquid must have an extremely low boiling point, like liquid air, boiling at minus 318° Fahrenheit. Apparent paradoxes of heat and cold are com- mon. In Winter, if a motorist uses an anti-freeze with a boiling point Jower than water, sooner or later it boils off. Any anti-freeze with that “‘boil- away” odor will boil off, regardless of special - “treatments.” Then, his car “freezes”... that is ta say: Tiny particles of ice in the radiator-core clog the circulation and cause over-heating around the engine-head. Thus in coldest weather his car boils . .. boils away the anti-freeze, and badly damages the car with heat, Magic? No—carelessness! A sure guarantee against such a dilemma is Eveready Prestone—the all-Winter concentrated anti-freeze. Don’t confuse Eveready Prestone with either glycerine or alcohol. By actual tests it pro- tects against rust from 5 to 20 times longer than other anti-freezes. It is undiluted, guaranteed one- shot protection, down to 60° below zero, if desired. Prevents “‘freeze-up,” rust, and corrosion. It will not boil off, and is absolutely odorless. Full protection so inexpensive! Read the full guarantee above, and protection chart on the opposite page. Here you will see how inexpensively your car can have Eveready Prestone protection all Winter long. 26 Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 97

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WHAT INSTRUMENT ) DO YOU WANT TO LEARN TO PLAY ? QUICK WAY TO LEARN MUSI Thousands now play in % the time and at but a fraction of the old way costs Simplified, quick method brings amazing results..VOUCHED FOR BY OVER 700,000 PUPILS Have you ever dreamed of the fun you’d have playing some musical instrument? Pictured yourself doing all the popular hits, movie theme songs, even classical numbers? Then here’s grand news for you! It’s news of an easy, fascinating, simplified method whereby anyone can learn to play real music by notes in a remarkably short time! And what’s more, you won’t need a private teacher. You'll learn all by yourself—right in your own home. And best of all, the cost is only a small fraction of what it used to cost by old-fashioned methods. No Special “Talent” Needed If you can just hum cr whistle a tune, you can learn to play quickly—easily—with the aid of this wonderful U. S. School of Music system of instruction. You learn to read reg- ular notes—and to play them—just as any real musician does. You start right in playing real little tunes almost from the very start. Gradually you master more and more diffi- cult ones until—sooner than you PICK YOUR ever expected—y ou find yourself en- tertaining your friends—playingat M NSTRUMENT parties—and having the best times Organ Clarinet you ever had in your whole life. pkra, Saxophone Trombone Harp Easy as A—B—-C Piccolo Mandotin A Gultar The success of this U. S. School Hawallan Steel Guitar Trumpet Sight Singing lano Accordion italian. and German ordion Volceand Speech Sulture Harmony an Campodigen Drums and Traps Automatic Finger Banle (Plectrum, 5- ring or Tenor) Juniors Plano Course method of musical instruction is due to two things. One is the fact that it makes everything so simple —so crystal clear—so easy to un- derstand. First it tells you how to do a thing. Then it shows you in pictures how to do it. Then you do it yourself and hear it. What could be simpler? The second reason for the success of this system is that it is so fascinating. Learning music this way is like playing a game. Practicing becomes real fun instead of a bore as it used to be with the old way, Free Booklet and Demonstration Lesson In order to show how easy—how simple—how pleasant this course is, the U. S. School of Music has prepared for you a free Demonstration Lesson and Explanatory Booklet. No matter what instrument you select to play the Free Demonstration Lesson and Booklet will show you at once the amazingly simple principles around which this method is built. And how it will enable you to become a popular musician in a surprisingly short time—at a cost of only a few cents a day. If you really want to learn music—if you want to win new popularity—if you want to enjoy musical good times galore—fill in and mail the coupon below. Don’t delay— act at once. You'll not be obligated in any way. U, S. School of Music, 26212 Brunswick Bldg., New York City. START NOW TO MUSICAL GOOD TIMES — m o i a o m a a a a a a e, U.S. SCHOOL OF MUSIC 26212 Brunswick Building, New York City, N.Y. Please send me your free book “How You Can Master Music in Your Own Home,” with inspiring message by Dr. Frank Crane, Free Demonstration Lesson and particulars of your casy payment plan. I am interested in the followlng course: eee ee ee Have you Instrument? Name. Address. City. — State. ee 28 Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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LONG NEEDED INVENTION SWEEPS COUNTRY A BUSINESS IN THE PIONEER STAGE, AS He ere New AS Air CONDITIONING, PAYING PROFITS COMPARABLE TO PROFITS MADE IN Early Days oF RADIO AND AUTOMOBILES INSTALLATIONS FROM $7.50 T0 $150.00 AND UP ON Which SALESMAN MAKES $5.00 10 $116.70 ano UP, This is a call for men everywhere to handle exclusive agency for one of the most unique business inventions of the past decade. To such men we say, “This is no doubt one of the most revolution- ary money making inventions that has ever cume to your atlention.’’ To those who ask, ‘‘Is ib sme clever new gadget?’ we sny, emphatically, “NO! This is no knick-knack, no trick filing idea— no new kind of adding maehine—not a check pro- & tector.” Instead, it is an invention needed by the smallest business. man as well as the largest cor- roralion and it has already saved countless thou- sands for the business firms which have adopted it, D, in so doing, IT HAS PAID THOU- SANDS TO THA SALESMEN WHO HAD THE GOOD LUCK TO BE THE FIRST TO SEE OUR NEWSPAPER HELP WANTED ADVENTIST- MENTS! Think of it! One of these first men has already made over 1,000 sales—each of these sales Daying a profit of $5 to $60—truly a fortune in profits on the 1,000 sales! Another’s record shows $1,080 profit in 23 dayst Still another’s orders give him a profit of $4,920 in three months! Now we Imow this is a great success—and now we are out to cover the entire country, Men wanted every- G where. Any man, young or Mature, who grasps this opportunity, may duplicate this success. The annual business should run into millions, We feel it will be worth while for every man who realizes the & importance of this opportunity to telegraph, or rush by fastest mail, the coupon for our proposition. Saves Thousands of Dollars for Offices, Stores, Factories What is this remarkable invention? You have to see what it is, read all about it, what it has ac- complished, to believe it is possible. This as- founding record of accomplishment is reported and yerlfied over the signatures of many of America’s mest and most distinguished business houses. ge firms are not the only beneficiaries—small anlzztions are enjoying tremendous dividends, too, Sanders Ridgeway of Kansas invests $89.60, saves “1,707.00 between April 5th and June 29th. Tox Ice d Coul Co., Wisconsin, sares $3,564.00. Baltimore ng Goods Co, saves $1,600.00 on $45 installa- L. S. Warner Merc. Co,. Texas, saves aver $1,000 on nstallation. Safety Auto Lock Ca., New York, ects $15 installation, saves $686.45. With these and scares of similar results to display, our representa- tives interest every business man, from the very small- est to the very largest. Noone can dispute the proof in the photo-copies of actual letters which our men show. Installed on Free Trial—Sells It- self ~ Saves Enough to Pay for Itself Before Salesman Returns We actually enable you to make installations at our risk, let the customer sell himself after the in- stallation is in and working. This does away with the need for high pressure selling—it eliminates the handicap of trying to get money before customer is really convinced. You simply tell what you offer, show proof of success in every line of business and every section of the country. Then install our invention without a dollar down. It starts working at onee, In a few short days, the installation has actually pro- duced cash money that is there and available to pay for the deal, with profits above the investment coming in at the same time! You then call back, collect your money. Think of it! Out of every $75 business you do, nearly $60 is your own profit! The very smallest you make is $5.00 on a $7.50 installation! Nothing is so convincing as our offer to let results sveck for themselves without risk to the customer! Each Installation Paves Way for Automatic Repeat Sales No need to go elsewhere, once you have sold every good prospect in town. You may stay where you are and build up a permanent substantial business. Every pleased customer needs “refill” supplies constantly, You make exactly the same commission on these big repeat orders as you do on the original sale. Washington Sanitarium and Hos- pital writes, “We have already used more than ten installa- Your Customer Takes No Risk Customer gets signed certificate guaranteeing cash profit on his investment. Very few business men are so foolish as to turn down a proposition guar- anteed to pay a profit, with proof from leading concerns that it does pay. No Canvassing No Supersalesmanship Communicate with Us at Once If you have not already heard of this invention being sold in your territory, ilons of the large size so far.” H. C. Heath writes, ‘We have only 13,000 population and I have already sold 76 installa- tlons, many of which repealed, and the above order makes 128 units for yours Lruly.’’ Practi- tally every time you establish a new customer, you increase your permanent income from repeat business., This enables you, on exclusive con- tract, to build an established, permanent route of customers which can be sold anytime like any other established business. SALESMEN NEEDED Where WHERE YOU RISK NO MONEY intry- ing out this business. Complete Training furnished. Ev man with us today started at seratch, without previous experience, many coming out of clerking jobs, many out of small businesses, some out of large concerns, Can't possibly tell you all inthe limited space available here. Mail coupon now for full information—noth- ing to risk, everything to gain. lose no time but get in touch with us immediately. This specialty is as 1m- portant a business opportunity today as the typewriter, adding machine, and the dictaphone were in their carly days. Men who can Lake the measure of an opportunity will see Lhis instant- ly. If yeu can show us you are the right man for exclusive franchise in your territory, your fulure ds assured. Write or wire at once. If writing, use the coupon below for con- venience. No obligation. Full in- formation will be sent to you at ence, F. E. ARMSTRONG, Pres. Dept. 4019-N ` Mobile, Ala. ABusiness of National Importance As well as selling thousands of installations to small merchanls, professtonal men, etc., we number either the parcnt companies, branches, or dealers, ete., of world-famed concerns among our cus- lomers: Cities Service Oil Co., Great Lakes Fish- erles, Ine., National Majestic Radio, Chevrolet, Chrysler, Damascus Steel Products, Public Utili- ties Consolidated Corporation, Union Gas Corp., Coca-Cola Bottling Co., National Radio, Timken Silent Automatic Co., Central States Petroleum, United Aluminum Corporation, Street Railways Advertising Co., Great American Life Underwriters, Na- tional Paper Co., and scores of others nationally known. Universities, newspapers, doctors, etc., buy substantial instellations and heavy repeat ordere. FOR EXCLUSIVE ‘RUSH TERRITORY PROPOSITION ! F. E ARMSTRONG, Pres., Dept. 4019-N, | Mobile, Ala. Without obligation to me, send me full Information on your proposition. Name ... Street or Route Box No. | City... |_State

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A. C. GENERATOR TEN Practical and inexpensive changes converting Dodge 12-V, Ford T, A, Chevrolet Delco 6-V generators into 100-500 watt capacity A.C. generators, or into 32-110-V. D.C. motor or genera- tor. Dodge is 500-W self-excited. All in one book illustrated with complete simplified instructions and drawings for only $1. Autopower, 412 5S. Hoyne Ave., Chicago. ADVERTISING AGENCIES Classified Advertisements Rates for classified ads, 120 per word (include name, address and all numbers) per accompany erder and be received in this office November 3 for the January issue (on sale Nov. 30). Modern Mechanix and Inventions, 52 Vanderbitt Avenue, New York City. MEN Wanted—At Once—by 40-year- old nationwide organization. Pleasant, dignified cecupation, calling on business and professional men, showing them how to save money on absolute necessi- ties. Positively no previous experience needed to make up to $15.00 a day. No investment required—nothing to buy— no canvassing—no price competition. Everything needed to get started fur- nished free. Rush name for complete details. Kaeser-Blair, Inc., Dept. 537, Cincinnati, Ohio. ADVERTISE: $15 reaches 6,000,000 readers with 24 word ad. Newspaper and mail-order magazine Rate-Guide, free. Chicago Advertising Agency, 22 West Jackson, Chicago. FROST-OFF. Marvelous Chemical Cloth keeps windshield free from Ice. Immense Demand. Big Profits. Send 25c for sample, Manufacturing rights for sale. Frost-Off Co., St. Paul, Minn. ADVERTISE—24 words in 250 news- papers $10. Lists Free. Advertising Service Bureau, 4650 Drexel, Chicago. FREE NEW advertisers rate guide. Brown Advertising Agency, 140 South Dearborn, Chicago. AGENTS WANTED CASH Income Daily Resilvering Mir- rors at home. Replating autoparts, tableware, etc. Portable outfit. Write Sprinkle, Plater, 850, Marion, Indiana. IF YOU want to get your groceries and household supplies at wholesale, and a wonderful chance to make $15 a day besides, send me your name immediate- ly. No experience necessary. New Ford Sedan given to producers. Albert Mills, 4649 Monmouth, Cincinnati, O. A BUSINESS of your own—Sell new and used clothing. 100% - 300% profit. Satisfaction guaranteed. We start you. Liquidation Merchandise, AK-550 E. 43rd, Chicago. GOOD Income Plating Auto Parts, Re- fiectors, Mirrors, by new method. Out- fits furnished; free particulars. Gun- metal Co., Ave. A, Decatur, Ill. MAKE Money. Collect $5, keep $4. Two quick selling dollar per month “hard times” life policies. Great North- ern Estate Corporation, Department C, Rockford, Illinois. SHOE manufacturer wants men. Big pay every day. Guaranteed quality. Low direct prices. No experience necessary. Sales outfit sent free. Write Consoli- dated Shoe System, Dept. C17, Chippe- wa Falls, Wisconsin. BIG MONEY and Fast Sales. Every owner buys Gold Initials for his auto. You charge $1.50; make $1.45. Ten orders daily easy. Write for particu- lars and free sample. American Mono- gram Company, Dept. 11, East Orange, New Jersey. REST Sellers. Cigars, Gum, Latex, Carded Goods, Incense, Toiletries, Necessities, Blades. Samples, Catalog .10c. Hundreds Items. Easterncity Sales, Capitol Bldg., Chicago. LOOK Agents—Big profits in selling Monogram Sets for stationery. Ideal for Christmas and Birthday Gifts. Box 150, Wausau, Wisc. $22.95 COMPLETE Radio—Listen_ to Europe. Agents Wanted. Low Price, Big Profits, Buy from Factory. D. Wil- cox, 308 W. Randolph, Chicago. PENNY Each. Popular Sizes. Guaran- teed Window Sign Letters. Enormous Profits. Easily Applied. Free Samples. Atlas Sign Works, 7941-G, Halsted, Chicago. 30 MAKE More Money Selling Shirts, Ties, Underwear, Dresses, Hosiery, Raincoats, Sweaters, Coveralls, Pants, Uniforms. Outfit Free. Nimrod Com- pany, Department 132, 4922-28 Lincoln Avenue, Chicago. AGENTS’ Gold Sign Letters for store windows. 500% profit. Free sample. Metallic Letter Co, 426 N. Clark, Chicago. BIG MONEY applying gold initials on automobiles, Easiest thing today. No ex- perience needed. Free samples. “Ralco,” 1084 Washington, Boston, Mass. AGENTS: Smash go prices. Santos Coffee 12c lb. 4-0z. Vanilla 8%4c. $1.00 size Tonic 14c.’ Razor Blades 10 for 8%c. 100 sticks Chewing Gum 12c. Christmas Cards, 21 in box, 14c. other bargains. Experience unnecessary. Write Carnation Co., MN, St. Louis, Missouri. asertion. 150 | Minimum 10 words. Cash must Address Classified Mgr., SENSATIONAL Patented Paint Strip- er, Wheeled Tips. Scoles Inventions, 6701 Prospect, Kansas City, Mo. AUTOMOBILES BUILD airflow midget, plans $1, pho- tographs 25c. Bill Lusk, 4841 Ogden, Cicero, Illinois. ee AUTOMOBILE SERVICE EQUIPMENT LOWEST Price Armature Testing Growler made. $4.50 Postpaid. P. Don- neau, 29 Cote Ave., Woonsocket, R. I. AVIATION ARMY Air Corps gives free flying training, salary, expenses paid. Infor- mation booklet, how to qualify, apply, 20c. Same information on Navy Avia- tion, 20c. Continental, Box 344A, In- dianapolis, Ind. AIRMINDED young men interested in entering aviation as apprentices. Write immediately, enclosing stamp. Mechanix Universal Aviation Service, A-13291 Ardmore, Detroit, Mich. METAL tipped propellers; Fords, $9.98; Henderson, $8.50; Harley, untipped, $3.50; New roduction ships, $98.00; iine 40 TEP. motors, $98.00; in- cluding propeller. Photos, information, and leather bound flying manual, 25c. Hibbs, Fort Worth, Texas. USED Airplanes, Gliders, $30.00 and up. Literature 10c. Continental Sales, Box 344A, Indianapolis, Ind. LORENZEN Propellers for Airplanes, Ice, and Snowsleds, also wind driven generators. Large illustrated catalog, dime. Lorenzen Propeller Company, Niles, Michigan. REGULAR income; home, office. No canvassing. McArthur Co., Desk 19, Butte, Montana. FREE Literature describing many mon- ey making plans. D-Belfort, 4042 N. Keeler, Chicago. AIRPLANES FOR SALE TWO place steel tube Ford A Heath Monoplane $300. A. C, Smith, Flax- ton, N. D. 100 AIRPLANES. Repairable crack- ups, $30 up. Send 20c for Directory. Used Aircraft Directory, Athens, Ohio. ARC WELDING ARC-WELD Generator, Built from Dodge generator, practical, inexpensive, conversion instructions 50c (coin). Thomas Electric Shop, Douglas, Ariz. ART INSTRUCTION AMATEUR Artists learn by doing real Commercial Art jobs. Successful Ad- vertising Art Director offers unique per- sonal instruction plan by mail. Send 10c coin or stamps for test lesson and full information. Jess Ingraham, 6735 Rad- ford Avenue, North IIollywood, Calif. ART NOVELTIES MAKE Big Money molding Novelties. Sample Mold 25c. Write for details on Free Course in Mold Making. Stewart’s Studio, X-2102 West 19th, Chicago. AUTO SUPPI.IES AUTOMOBILE Supplies! Radios! Bankrupt Stocks! World’s Lowest Prices! Reconditioned AC Spark Plugs 29c! Hot Water Auto Heaters $3.98! House Radios $12.85! Paint 95c gallon! Seat Covers 98c! 1000 Bargains! Free Bulletin! Standard Liquidators, 1363- B Gratiot, Detroit. BROTHER Can you spare a dime? If you can, send it to me and I’il send you my 1934 Low Priced Aviation Ma- terial Catalogue. Kart Ort, 648 W. Poplar St., York, Penna. S-B PROPELLERS give better per- formance. Stop. Before you buy that propeller send your inquiry to- us, have fifty propellers to make selection, have also some real bargains in used pro- pellers. Just tell us what you want. Sensenich Brothers, Lititz, Pa. BATTERIES BATTERY Rebuilding Information, 25c (coin). General Battery Service, 76 Glenwood, Minneapolis, Minn. BUILD New Batteries from Old, Thousands can be put into service. Send 25c for instructions, mold catalog and plans to convert old Batteries and Dodge Generators into Complete Farm Light- ing Systems. Home Occupations, St. Paul, Minn. - BICYCLES BICYCLE Repair Book—tTells every- thing—Send 25c—Parts Catalog Free. A. H. Harwell Cycle Works, Dept. 102-N, 6267 Gravois, St. Louis, Mo. MAKE your bicycle tires last longer, 10c coin. Box 396, Lake George, N. Y BIG MAILS BUSHELS of letters bringing money- making opportunities, 25c. Mailmarts, Cincinnati. Ohio. BOOKS FOR SALE SEND stamped, addressed envelope for free copy of big M-M Blueprint book, listing many workshop books and blue- print plans. Modern Mechanix Publ, Co., 529 So. 7th St., Minneapolis, Minn, Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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BOXING LEARN Boxing. Complete illustrated instructions 25c, Wrestling 25c, Jiu- Jitsu 25c, Exerciser adjustable 1-1000 Ibs. pressure $1. Prof, Dryer, Box 1850, Chicago. BUSINESS OPPORTUNITIES “KEY to Business Opportunities” free. Goodall, Box 1592-P, San Francisco. S$$$ $40,000—I made it. Plan 10c. “MooreMade,” Lapeer, Mich. ‘BUTTER 6c a pound: Good brick table butter (not butterine) 1 pound or 100 at 6c lb. Particulars 25c coin. Results guaranteed or money refunded, Hall- beck Co., 6219C Wentworth, Chicago. NEED Money! Try my Guaranteed plan, 25c. H-Wilson, Box 145, Beaver Dam, Kentucky. CASH Income Daily Resilvering Mir- rors at home. Replating autoparts, tableware, etc. Portable outfit, Write Sprinkle, Plater, 845, Marion, Indiana. WHOLESALE Supply Sources, half million items, 10c International Agency, Cincinnati. SIGNS easily painted with Letter Pat. terns. No lessons or experience re- quired. Booklet pampes and index hand, mailed, 10c. Refund on first order. John Rahn, B 2120 Neva, Chicago. FORTUNE; Making, Waste Oil Burn- ers, Metal Polish, Roof Paint, Broom angers, Mandolin Picks, All 25c. Progress, 747 American, Long Beach, California. BIG Profits from your own business. 25c in coin for sample and complete in- structions. Master Prints, Dept. MM, Laura, Ohio. ARTIFICIAL marble formulas, three for 25c. Johnson, 4520B Christiana, Chicago. HOMEWORKERS—$25.00 weekly for eight hours’ work addressing envelopes. Everything furnished. Capital or ex- perience unnecessary. Complete instrue- tions 25¢, Business Builders, James. burg, N. J. LEARN all about casting marble novel- ties in rubber moulds. Cement secrets. Illustrated catalog and beautiful samples 3c. (So. Calif. business reserved.) John H. Payn, 945 Grande Vista Avenue, Los Angeles, Calif, CASH! Listing Local Names. Interest- ing spare time home occupation. Com- plete working plans 25c postpaid. Pub- lishers Bureau, 850 East 47th, Chicago. YOUR Own home business. Earn, be independent. Complete instructions. Send dime. Scovco, Mount Clemens, Mich. ARTIFICIAL Marble making puts you in paying business all your own. Easy, Pleasant, profitable work. Interesting particulars free. Marblene Institute, 4612-A North Hermitage, Chicago. MAKE, Sell your own products. Book- let containing formulae for 25 popular articles, with source of supplies, and hints on mixing, 25c. V. Lynch, 6409 77 St., Middle Village, N. Y. STEADY Income from drained auto oil! Instructions, 25c. International Agency, Cincinnati, Ohio. MEN-WOMEN interested earn money home, write Eller, F-277 Broadway, New York. RECEIVE 100 letters and dimes daily. Guaranteed plan 10c coin. H. Getz, 1012 3rd St. S. W., Washington, D. C. HOMEWORKERS, 87 ways to make money without peddling. Free particu- lars. Victoria Co., Box 666, Albu- querque, New Mexico, COLLECTION of clever plans for mak- ing $10-$50 weekly, many requiring no capital, Folder free. Delhenty, Webb- woad, Ontario, Canada. START $40 week home spare time busi- ness on ‘'shoe-string.” Particulars 10c. Charles, 12-R, Norwood, Ohio. EARN while learning—men—women— your own Cleaning - Pressing Business. Easy home training. Free Outfit offer. Write M-42 Business Ownership Insti- tutes, 2400 W. Madison, Room 701, Chicago. FREE, Complete plan of the best money maker of them all. Send stamp. W. Stubhs, Beaver Ave., Des Moines, Iowa. WISE Men Get Money Easy! Plan 10c. “Mooremade,’”? Lapeer, Mich. AMATEUR „cartoonists, earn $25.00 week, spare time, copying cartoons fcr advertisers. Three-M Syndicate, Argyle, Wis. PRAY, work and succeed. Large variety business plans and formulas should put you on easy street. J.iterature free, W. J. Speed, 38 West Orange St., Jack- sonville, Florida. THE PLASTEX Industry needs manu- facturers on small scale and for big pro- duction of Art Goods, Novelties, Souve- nirs, ete. in Plastex and Marble imita- tion. Experience unnecessary. 2c ma- terial makes 25c articles. Rubber moulds furnished for speed production. We place orders and buy goods. Small in- vestment brings big returns. Interest- ing booklet mailed free. Plastex Indus- tries, Dept. R, 1085 Washington Ave., New York. COMPLETE Chemical Service, Analy- sis, Formulas, Consultations. State Licensed Chemist. Twenty-five years’ experience. Write for literature. W. L. Cummings, Ph.D., 428 Gordon Avenue, Syracuse, N. Y. START Now! A profitable spare time, home mail business. Complete instruc- tions 25c coin. Bucher, 4631 Perrys- ville Rd., Bellevue, Pittsburgh, Pa. TWO Big Opportunities, one for city, one for rural. Send quarter for both. GLH Co., 247 No. Concord, South St, Paul, Minn. MAKE $21 per 100 Stamping Names on Keychecks. Samples and Instructions, 25e. Supplies Furnished. Ketagsm, Cohoes, N. Y. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers SELL by Mail! Books, Novelties! Bar- gains! Big profits! Particulars Free! H. Elfco, 525 South Dearborn, Chicago, DEPRESSION Whipped! Workable plan for energetic people. Two dimes. Satisfaction guaranteed or money re- funded, Scott, Taft, Oregon. TATTOOING Outfits, Supplies—Cata- logue. Guaranteed Remover. “Waters,” M-965 Putnam, Detroit. MAKE your own Synthetic Rubber molds. Cheap as glue. Stands boiling water. Dime brings sample mold and marbleized cast, all about mold making and marbleizing. Cowell Institute, Gray- ling, Mich. MONSTER Mails: Money Making Plans, Formula Offers, 10c. Duffy-Co., Covington, Ky. BE Independent. Operate your own husiness. Illustrated booklet explains how. Send stamp for copy, R. E. Mellor, Box 12, Waverly Station, Baltimore, Maryland. MAKE $15.00 to $30.00 weekly at home, man or woman. Everybody likes candy. Send $1.00 bill for 100 delicious candy formulas. Moss Candy, Box 584, Albany, N. Y. WRITING for Proft. 10c. E. Pratt, 89 Leland Road, Rochester, N. Y. TEN Selected Business Plans for mak- ing money at home. All Winners. Also “How to Raise Mushrooms,” sent for only 35c. R. M. Robbins, 7716-12 So. West, Seattle, Washington. TURNING Ideas Into Cash—new book, circular free. Wayne Fox, Pleasant- ville, N. J. GET Barrels of Mail, Your name in 10,000° Opportunity Directories 25c. Sample Directory 10c. Roservice, 4627 Glenshade, Cincinnati, START Retail Store without capital, application 10c. Hugh Amidon, Elyria, Ohio. 500% PROFIT Manufacturing products yourself. Write Thomsen, 7309 Pingree, Chicago. CASH earnings positively guaranteed! No canvassing. Rush dime. Mailmarts, Cincinnati, O. CAMERAS AND PHOTO SUPPLIES FREE! Bargain Catalog-—Greatest In- ventory Clearance Sale in our 35 years. Send for your free copy listing thou- sands of cameras, lenses, accessories, and photographic supplies. Central Cam- era Co., Dept. MME-12H, 230 South Wabash Ave., Chicago, U. S. A. ' MAKE Money in Photography. Learn quickly at home. Spare or full time. New plan. Nothing like it. Experience unnecessary. American School of Pho- tography, Dept. 2046, 3601 Michigan Avenue, Chicago. 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 Photo graphers, Dept. A, 10 West 33rd St., New York. AMATEUR Photographers and Cam- era owners, make real money from start at home. Time tested, steady money- making proposition Free. Ruth Photo Service, Frackville, Pa. CARNIVAL GAMES MAKE you money—Outfits supplied, catalog 10c. ‘‘Mooremade”, LaPeer, Michigan. : CARTOONING LEARN Cartooning—30 lessons, 500 illustrations with drawing pens’ and pencils. Postpaid complete $1.00. Sco- vell Studios, Box 610-A, Hollywood, Calif. CARTOONISTS Illustrate news items. Plan 25c. Dixudio, 63 Louis, Bruns- wick, N. J. WHERE to sell cartoons. Send 25c for Cartoon Market Guide, 3235 Jefferson, Cincinnati, Ohio. CHALK TALKS COMICS for chalk talks $1.00. Sanden, 716 21st, Bellingham, Wash. LAUGH Producing Program, $1.00. Catalog free. Balda Art Service, Dept. 65, Oshkosh, Wis. CHEMISTRY SEND 10c for new catalog listing chemical, microscope and photographic kits and supplies. Special 30 day offer to those who send immediately. Winn Company, 124M West 23 Street, New York. FREE! Sciencecraft Magazine! Send stamp for copy and other valuable litera- ture. Sciencecraft, M]-5049 Bernard, Chicago. HOME Laboratory Journal contains loads of experiments and scientific news, queries dept., facts on chemical science, valuable fab ratory suggestions, and articles of tremendous educational value, etc.; with a humor page that will rock you with laughter. For sample copy send only 5e in stamps. Chicago Press, 162 W. Carroll Ave., Chicago. 31

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CHEMISTRY EXCEPTIONAL offer, Special Chemi- eal set and valuable catalogue. Send 25c in money or stamps. Kemkit Chemical Corporation, 135 M Johnson Street, Brooklyn, New York. DETECTIVES BE A Detective. Make secret investi- gations. Experience unnecessary. Write United Detective System, 1623 W. Grand, Chicago. DETECTIVES. Make Secret Inves- tigations. Experience unnecessary, De- tective Particulars free. Write, George Wagner, 2640-V Broadway, N. Y. BECOME a successful detective. Par- ticulars and Detective Paper Free. National System, 340-D Electric Bldg., Omaha, Nebraska. DISTRIBUTORS WANTED DISTRIBUTORS: Represent manufac- turer. Sell Latex—self-sealing bandage that breathes. Great demonstrator. Low- est prices. 400% profit. Good repeater. Exclusive territory. Neway, 24-G, So. Clinton, Chicago. DOG TRAINING TRAIN Your Dog—For home or vaude- ville, 80 interesting Dog Feats with complete instructions. $1.50 postpaid. Circular and sample tricks 10 cents. Collier Trainers, Box 610-M, Holly- wood, Calif. DUPLICATORS & SUPPLIES POSTCARD Stencil Duplicator $7.50 Complete. Wholesale prices all duplica- tor supplies. Agents wanted. Bond Equipment Co., St. Louis. DUPLICATORS $2.50 up. Changeable “copy” Stamps 40c up. Circular free. Charles, 12-M, Norwood, Ohio. INCREASE Business. ‘‘Excellograph” Rotary Stencil, Clay, and Film Duplica- tors $3.85 to $37.50. Prints anything typewritten, penned, drawn, traced. Colors. Folder Free. Pittsburgh Type- writer Supply, Suite 519, Pittsburgh, Pa. EDUCATIONAL AND INSTRUCTION RAILWAY Inspection: Work home or travel. Experience unnecessary. Write Superior Schools, Crozer Bldg., Chester, enna, USED Correspondence Courses and Educational Books sold or rented. In- expensive. Money-back guarantee. Write for Free Catalog Listing 4000 bargains. (Courses Bought). Lee Mountain, Pis- gah, Alabama. MILWAUKEE Industries desire to con- tact earnest young men to learn elec- tric arc welding in their laboratories of the School of Engineering. Small train- ing fee. For details write Oscar Wer- wath, President, 1020-22 N. Broadway, Milwaukee, Wis. ELECTRICAL SUPPLIES INSULATION, wire, varnishes. sup- plies, etc. Send 3c stamp for bulletin. Autopower, 412 S. Hoyne Ave., Chicago. ELECTRICAL EXPERIMENTS BANKRUPT Stock—Electrical Experi- mental kits—Kit makes motors, detec- tophones, arc furnace, telephones, etc. Salvage price $1.99. Other outstanding electrical values—Catalog—Stamp. Elec- trical Salvage Co., Box 524-A, Lincoln, Nebr: ELECTRICAL EXPERIMENTERS ELECTRIC Eye—40c builds it. Hun- dreds of fascinating experiments. Plans 25c coin. Albers Research Laboratory, 3834 Humphrey St., St. Louis, Mo. BUILD 32 volt “B” Power Unit. Easy, Cheap. Plans 50c. Particulars dime. Pulis, Booker, Texas. 32 EMPLOYMENT SERVICE WANT Salaried Position? Send dime for Jobseeker’s Guide. Shows How. Employment_Counselors, 401-MC Bed- ford Bldg., Chicago. ENTERTAINMENT & PLAYS MINSTREL Show—Complete $1.00. List music, playlets and novelty song- card, 3c stamp. Rialto Publishers, 1658 Broadway, New York. FIRE ARMS — GUNSMITH’S Secrets—Bluing, check- ering, engraving, etc., 25c. Internation- al Agency, Cincinnati. FOR EXPERIMENTERS FREE! Sciencecraft Magazine! Send stamp for copy and other valuable litera- ture. Sciencecraft, M-5049 Bernard, Chicago. FOR INVENTORS INVENTIONS now salable before pat- enting. Safe, practical. What have you? Chartered Institute, 598A Barrister Building, Washington, D. C. INVENTORS, Original ideas to de- velop, no hints or junk. New lists monthly. Clair, Box 161, 25c coin. Granite City, Ill. ; INVENTORS—Sell your inventions before patenting. Free particulars. Write W. T. Greene, 942 Barrister Building, Washington, D. C. INVENTORS—Large list of invention buyers and wanted inventions, all for 25c coin. Box 117, Fairfax, S. C. PATENTS—Small ideas large commercial possibilities. immediately for information on how to proceed and “Record of Invention” form. Delays are dangerous in patent matters, Clarence A. O’Brien, 28-L Adams Building, Washington, D. C. INVENTORS—Ideas developed into practical inventions and working models built. Electrical problems solved. Low- est prices and confidential service. Reo- Paul Engineering Co., 1208 E. Monu- ment St., Balttmore, Maryland. ATTENTION Inventors. Unpatented inventions marketable. Real advice and protection. Write H. Benjamin Royer, Delaware, Ohio. FORMULAS 25 LATEST beauty, polish, soap formu- las, source of supply, only $1.00. Big Olender Co., 1230 Park Row Bldg., New York. 500 FORMULAS 25c. Money-making Heats Free. Ideal, 178-M, Parkridge, ino1s, 3,000 FORMULAS, Facts, processes, trade secrets in Dr. Brown’s Book of Formulas—380 pages. Price, postpaid $1.00. Ogilvie Publishing Co., 57 Rose Street, Dept. 4, New York. FORMULAS—AII kinds. Guaranteed. Catalog Free. Kemico, B-16, Parkridge, Tilinois. FORMULAS — Interesting literature free. D-Belfort, 4042 N. Keeler, Chicago. CHEMICAL Coal Saver, 25c. Radiator Anti Freeze, 25c. Duffy-Co., Covington, Kentucky. TESTED Formulas. Full details free. Kaplan, 13 S. Eden. Baltimore. 500 FORMULAS, trade secrets, 25c. Literature free. Pelishek’s, Adell, Wis. MEDICAL Formulas! Complete line. Special—Stomach Powder Formula $1. Continental, 3542 Polk, Chicago. TWENTY leading formulas! Quarter brings them all! International Agency, Cincinnati, O Sample set FRETWORK PATTERNS TEMPLATE Patterns make finest doll furniture, toys, fretwork novelties. 10c. Puzmak, Colorado Springs, Colorado. FRETWORK Designs—20 beautiful samples 20c. James Field, Colorado Springs, Colorado. GASOLINE ENGINES ¥% TO four horsepower gasoline engines for operating midget autos, lighting plants, model airplanes, general utility. Finished or castings. Send dime for bargain lists., Columbia, 4020 Lake Street, Chicago. pace ee GUMMED LABELS — 1000 PRINTED, size 4"'x2%", 50c. Marsh, 2055 Westcourt, Ithaca, N. Y. GUNS AND SPORTSMEN’S SUPPLIES GENUINE U. S. Army Leather Sling Straps 65c postpaid, Swivels 55c, U. S Barrel Blue $1.39, Factory Seconds Recoil Pads $1.00, $5.50 Hunting Coats $3.95, Pants $2.65, $8.75 Hunting Shoes $5.75. Satisfaction Guaranteed. Incor Mfg. Company, Terminal Building, Youngstown, Ohio. HEATING SAVE—Burn more air and save on ycur coal bill. Three shovels of coal do the work of four. Cheap and easy to make a Furnace Air Superheater. Plan and instructions, 25 cts. (coin). Stark Heat- ing Engineering, 237 E, Delaware Ave., Toledo, Ohio. HELP WANTED MEN Wanting Jobs on new construc- tion work in United States, South America, other countries, write a Moore, 1824 Hunter Bldg., Chicago. Enclose Stamp. 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 Bureau, 234, St. Louis, Mo., Today. GOVERNMENT Jobs—Every applicant should have “Arithmetic for Civil Ser- vice Candidates.” Valuable aid for all examinations. Latest typical problems, answers, solution methods. $1.00 post- paid. Civil Service Lyceum, 509C Fifth Ave., New York. WE Want All Indianhead Pennies. Send 10c for list of premiums we pay. Photonumismatic, 100 Forsyth, New York. HYPNOTISM HYPNOTIZE instantaneously! New dollar book 25c. Lonk Institute Hypno- tism, D-1313. Palatine, Illinois. INFORMATION RELIABLE information, source sup- ply, any subject, $1.00 up. National Bureau of Information, Cedar Rapids, owa. PRIVATE Information given, and questions answered on any subject (chemistry, engineering, problems, etc.). Money-back guarantee. Send dime—tre- tainer. Confidential Services, Box 657, Meriden, Conn. INSTRUCTION MEN—Women, 18-50. Govenment Jobs. $105-$175 month. Many Fall Ex- aminations expected. List positions— full particulars FREE. Write today. Franklin Institute, Dept. J-91, Roches- ter, N. Y. WANTED: Names men wishing Gov- ernment jobs. $141.00 month. List po- sitions—sample tests, FREE. Franklin Institute; Dept. K89, Rochester, N. Y. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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INVENTIONS SMALL Inventions wanted. A. Hull, 7829 Euclid Avenue, Cleveland, Ohio. SOUND, practical inventions, patented or unpatented, wanted by our manufac- turer-clients. Write Chartered Institute, 508A Barrister Bldg., Washington, D.C. INVENTORS—Large list, inventions, buyers and wanted inventions, 25c coin. Albers Research Laboratory, 3834 Hum- phrey St., St. Louis, Mo. A INVENTIONS WANTED—Patented, unpatented. If you have an idea for sale, write Hartley’s Inc., Box 928-J, Bangor, Maine. S aed ig a a INVENTIONS Commercialized, Pat- ented or unpatented. Write — Adam Fisher Company, 582 Enright, St. Louis, Missouri. nn INVENTIONS are the source of wealth and independence. What have you? Write National Service Bureau, Dept. H., St. Louis, Mo. — I INVENTIONS Wanted, Patented or Unpatented, any size, any material, for any purpose. Now is the time to act. Send us your ideas. A square deal as- sured, Bosley Mfg. Co., Torrington, Conn. en MACHINERY, TOOLS AND SUPPLIES INVENTORS, model makers, home workers—universal chucks $10.00, Lathe centers, reamers, tools, gears, blue- prints, machinery. Send 15c for latest Supply Catalog. Howard, 2417 N. Ash- land Ave., Chicago. ——_—_— eee HARD to Get Materials plus money- making ideas for inventors, craftsmen and manufacturers. A book every think- er should have—only 10c. The most varied line available of electrical, hard- ware specialties, metals, bakelites, woods, chemicals, insulations, minerals, com- pounds and rare materials. Unusual listing of motors, belts, gears, pulleys, bearings, wheels, switches, drives, ma- chinery, tools, flexible shafts, compres- sors, sprayers, blowers, fans, drills, in- struments, welding material, adhesives. Get yours now. 1/20 H. P. variable speed 2 shaft AC-DC motor $3.95 post- paid. E. M. A. Corp, 3539-52 Fifth Ave., Chicago, Illinois. De VAR HARD to Get Supplies; Specialties; Tools; Magnet Wire; Insulation; Metals; Motors; Pumps; Gears. Catalog 10c. Kostka, 2358-K South Crawford, Chicago. MAGIC TRICKS & NOVELTIES SVENGALI Trick Cards—All look different but when blown upon are alike. 65c. Also Changing card trick 15e. Regent Specialties, 1030 Hyde Park Blvd., Chicago, Iflinois. FUN! “13 Funny Love Letters,” 10c. Stukes, 2112 Venus, Jacksonville, Fla. LEARN Magic. Large illustrated cata- log of tricks you can do, 25c. Holden, 222 W. 42nd St., N. Y. LEARN tricks that made magicians fa- mous. Escape from handcuffs, ropes, trunks, etc. No expensive equipment necessary. Full instructions 50c. Prince, Box 601, Sioux City, Towa. MALE HELP WANTED | EARN Quick Cash Raising Mushrooms in cellar, shed, attic. We buy crops. Guaranteed materials furnished. Easy, QOdorless method. Book Free. United, 3848-BK Lincoln Ave., Chicago. FOREST Jobs easily available, $200 month. Cabin, Hunt, trap, patrol. Get details immediately. Rayson Service, K-32, Denver, Colorado. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 3 MALE INSTRUCTION DETECTIVES. Work home or travel. Experience unnecessary. Write, Ameri- can Detective Institute, 2640-T, Broad- way, N. Y. MERRY-GO-ROUNDS MERRY - GO - ROUNDS — New and Used Outfits — Catalog 10c, ‘‘Moore- made”, LaPeer, Michigan. MICROSCOPES 300- 600X (360,000 AREAS) Micro- scope—outht $1.50. 300X $1.00. 500X Pocketscope 50c. 33.3X Flash-O-Scope $1.00. Guaranteed. Postpaid. Supple- mentary objectives fitting all micro- scopes—Powers to 1000x—50c up. Ex- perimenters Bulletin — catalog free. Pfleegor Laboratories, MM12, Milton, Penna. MISCELLANEOUS BACK Numbers — Steam, Electrical Magazine, while they last, ten issues $1.00, prepaid. The Progressive Engi- neer, Malden, Mass. WE Buy, Swap, Sell; Anything, Every- thing. Best Bargains! Wholesale, Retail. Lumber, Books, Relics, Machines, Coins, Clothing, Food. Soup to Nuts. Write us first! Agent in territory. Dime brings particulars, Our Co-operatives, Glenn Rick, Mt. Clemens, Michigan. MAKE your hobby pay for itself. Build model airplanes. We help to sell them. Send 50c for supplies and instructions. Box 932. New Britain, Conn. 300,000 ARTICLES. Wholesale Direc- tory 10c (coin). Box 5724 Olney, Phila- delphia, Pa. USE our ofice—Mail, phone calls, tele- grams, answered, forwarded. Merchan- dise received. Consignments handled. Contacts made. $3 month. E. White, 415 Chamber Commerce, Indianapolis, Indiana. WE Purchase All Indianhead Pennies, Pricelists 10c. Photonumismatic, 100 Forsyth, New York. SNAPSHOTS—Magazines buy them. I'll tell you where and how to sell them. Information 15c (coin). Box 5724 Olney, Philadelphia, Pa. SEND us 25c (coin) for a genuine $1.00 Goodrich safety razor hone. “Vicks”, 1318 High, Logansport, Indiana. MODELS & MODEL SUPPLIES ENGINES, Steam & Gas 1/10 HP up. Models, Miniature & Practical. Boilers, Pumps, Machinery, Mechanical Books. Engine Castings & Blueprints. See cata- log No. 34. For Experimenters, Model- makers materials & supplies get catalog No. 35. Either postpaid 20c. Canada 30c.. Refunded first order. Circular Free. Evraymesco, 28 No. Clinton, Chicago. YOUR Ideas developed into practical, working model. 30 years successful experience; thousands satisfied custom- ers, Confidential service guaranteed. Bank references. Send 3c postage for 32 page book “Making Inventions Pay.” Crescent Tool Company, Dept. T. Cin- cinnati, Ohio. BEFORE starting your model boat, en- gine, boiler, railroad, write for circular on 35 cents model books. The Model Shop, Box 2385, Cleveland, Ohio. MODELMAKING MODEL iAKERS—Brass, copper, fibre, steel and aluminum in all shapes, also castings, gears, screws and fittings. Catalog 10 cents. Experimenters Supply House, Dept. M, Box 10, Station Y, N. Y. THE MODELMAKER. The Magazine for those interested in building model railroads, boats, engines. Send 15 cents for copy. Modelmaker Corp., 330M West 34 Street, New York, N. Y. MOTION PICTURES 8MM FILMS—Mickey Mouse, travel, others. List for two 134c stamps. Lin- coln Film Service, Box 293-C, Saginaw, Mich. HOME MOVIES! Guaranteed cameras and projectors. Priced low. Cine Pic- ture Service, Box 94, McGaheysville, Virginia. MICKEY Mouse 16mm projector outfits $4.95. Other projectors $3.75 up. Fa- vorite star films 35c up. Art sample (16mm, 8mm) 25c. Free- 16mm, 8mm bargain lists. Home Movies, Box 32M, Easton, Pennsylvania. MOTORCYCLES Special prices on chains, batteries, carburetors, accessories. Indian, 622 E, Grand, Des Moines, Iowa. ” SEND 15c for illustrated used Motor- cycle catalog. Large stock. Bargains. Indian parts. Accessories. Indian Mo- toreycle Sales, Kansas City, Missouri. ALLOY Pistons. Harley, Henderson, Indian, Excelsior. Used parts, catalogue and wings pin 10c. Ballak, 100 N. 12th, St. Louis. Mo. MOTOR WINDING DATA MOTOR winders: winding data, 100 A.C. motors, special selection, various -horsepower and voltage, $1,00. Motor Data Service, 3002 Monroe, Kansas City, Missouri. MOVIE CAMERAS FOR SALE FOR SALE new and used film, cameras, projectors, screens, sound, silent, acces- sories, National Library Free Member- ship, catalogue. Mogull Bros., 1944-G Boston Road, N. Y. C. NOVELTIES RARE Books, Cartoons, Photographs. 20 Snappy Samples $1.00. Catalog 10c. E. Braun, 353 West 47th, Chicago. OLD GOLD WANTED WE Pay big prices for Old Gold, Diamonds and Silver. Ship today; cash by return mail. Government licensed. Send for free catalog. I. Press & Sons Co. Reliable Jewelers for nearly fifty years. 804 Chestnut Street, Philadel- phia, Pennsylvania. PATENT ATTORNEYS INVENTORS: Send immediately for your copy of our big, new Free book, “Patent Protection.” Forty-eight pages of interesting facts. Tells how Patent Laws protect you; kind of sketch or model needed; simple steps to take with- out cost; how successful inventors have secured financial assistance; shows in- teresting inventions; illustrates impor- tant mechanical movements. Other men have read and profited by this book. With book we also send Free Evidence of Invention form, that you can use to six years’ experience. ences. Write us today. The facts in our book are worth money to the man with a good invention. Address: Victor J. Evans & Co., Registered Patent Attor- neys, 420-P, Victor Building, Wash- ington, D. C. w

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PATENT ATTORNEYS INVENT something! New discoveries have cured previous depressions. Un- atented ideas can be soid. I tell you how and help you make the sale. Free oarticulars. Write W. T. Greene, 958 Barrister Building, Washington, D. C. PATENTS—Before too heavy an out- lay of time or money is made on an invention, a search of the Patent Office records should be made to determine as nearly as possible whether or not the same idea has been patented before. The cost of this search is small, while the value of the facts it uncovers is often considerable. We offer inventors and manufacturers a thorough, prompt, con- fidential search service—plus experi- enced counsel and assistance in every phase of Patent and Trademark practice. Write for my free book containing valu- able information relating to patent pro- cedure. Clarence A. O’Brien, Regis- tered Patent Attorney, 28-M Adams Building, Washington, D: `C. $40 INVENTIONS Patented, Regis- tered Attorney. Samuel Goldstein, 275 E. Gunhill, New York City. PATENTS -` GET your own patents; legal blanks, complete instructions $1. Cudding Sons, Campbell, Calif. $ INVENTIONS Commercialized, Pat- ented or unpatented. Write — Adam Fisher Company, 582 Enright, St. Louis, Missouri. PATENTS—Reasonable terms. Book and advice free. IL. F. Randolph, Dept. 341, Washington, D. C. PATENTS. _ Booklet free. Highest references. Best results. Reasonable fees. Watson E. Coleman, Victor Build- ing, Washington, D. C. PATENTS—Small ideas may have large commercial - possibilities. Write immediately for information on how to proceed and “Record of Invention” form. Delays are dangerous in patent matters. Clarence A. O’Brien, 28-L Adams Building, Washington, D. C. ee cleat A cet eat a a PERSONAL a EO INDIGESTION naturally cured. In- formation free. Flow, 6618D imby Cleveland, Ohio. ease ITOROSCOPES—Make - - Your Own; easy, complete instructions, 60c post- paid. Floyds, 115 Prospect, East Orange, New Jersey. FORTUNES await unlocated heirs! Authentic list, 25c. International Agen- ev, Cincinnati. PETS CHOW Puppies, Dark Red, Champion Pedigree. Gerald Reimers, Manning, owa. PHOTO DEVELOPING FILMS developed 5c per roll; prints 3c each. Ask for Special Bargain List. Roanoke Photo Finishing Company, 159 Bell Avenue, Roanoke, Va. SUNLIGHT (Washproof) prints from negatives on paper, linens, wood, etcetera. 2 minute Transfoto. Results Guaran- teed. Bottle sufficient 100 4x6 prints 75c (COD $1). FDOR, 50 E. Fordham Road, NYC. TEN picture negatives reprinted, 25c; 8x10 Enlargement 25c; Rolls Developed, Printed 25c; Cardinal Photo, Summit, New Jersey. POEMS—SONGWRITERS WANTED: | Original Poems, Songs. MMM, Publishers, Studio Bldg., Port- land, Ore. WRITERS! Poems, melodies. Oppor- tunity. Hibbeler, D195X, 2157 North Avers, Chicago. 34 PRINTING PERSONAL Stationery and Christmas Greeting Cards deals: See wonder cata- log 3c, with 3 gifts. Smith Novelty Jobber, Miami Beach, Fla. s FIVE hundred envelopes printed, $2.50. McManus, Jr., Weyman Ave, New Rochelle, N. Y. 1000 CARDS, Blottercards, $1.40. 500 Envelopes, statements, bill- heads $1.75. Illustrations. Anything Printed. Half cash, Bredshaw, 3214 Huron, Chicago. x ale 2000 BUSINESS Cards neatly printed $1.50. Atlas Distributing Co., Roberts St., Pittsburgh, Pa. : Tickets 500 LETTERHEADS, 500 Envelopes $3.00. Harold Mallo, 767 Leith Street, Flint, Michigan. RADIO SHORT Wave Sets, Kits, Supplies. Wholesale catalog, 5c. Federal Tele- graph, Box 344A, Indianapolis, Ind. WONDERFUL 6 volt battery Midget Radio—Requires no B Battery—$19.95. Solter Radio Shop, 103 N. 7th St., Min- neapolis, Minnesota. RADIO Engineering, broadcasting, avi- ation and police radio, servicing, marine and Morse telegraphy taught thoroughly. All expenses low. Catalog free. Dodge’s Institute, King St., Valparaiso, Ind. GOVERNMENT gives free Radio Operators’ training for service on air- craft, ships. Salary, expenses paid. In- formation booklet, how to qualify, apply, 20c. Continental, Box 344A, Indian- anolis, Ind, RADIO & TELEGRAPH BOOK FREE—Radio and Morse telegraphy book. Learn code in short time. New -easy method. Fisher Electric Company, 3801 Riverside Avenue, Cleveland, Ohio. REAL ESTATE OZARKS—Five acres timbered river frontage, fishing, boating, pearling, shooting—$100, $5.00 monthly. Hub- bard, 224 Grossman Bldg., Kansas City, Kans. ROOTS AND HERBS JUST OUT! World’s greatest “Herb Almanac.” Beautifully illustrated in natural colors. Contains over 500 old- fashioned herb medicine recipes and In- dian secrets for home use, 10c (coin) postpaid. Worth dollars! Bontanics, 145 W. 112th St., Chicago. WANTED—Common weeds by steady buyers! Details 10c International Agen- cy, Cincinnati. RUBBER STAMPS RUBBER Stamps 20 cents up. Nelson Stamp Service, Wausau, Wisc. SALESMEN WANTED STRANGE Chemical Sponge cleans cars like magic. Banishes autowashing drudgery. Sells on sight. 150% proft. Outfit Free. Kristee Mfg., Box 2501, Akron, Ohio. MEN WANTED at once to call on stores with newest line self-selling 5c and 10c necessities. Strong, original counter displays. Aspirin, Mercuro- chrome, razor blades, household cement, ete. Automatic sellers. Many new items. Up to 125% profit. Big catalog Free. Procopax, Dept. 95-DD, 1956 S. Troy, Chicago. $4.00 PER DAY and up for only part- time work selling latest advertising novelty. Samples and instructions 10c. Sekan Mfg. Co., Independence, Kansas. MAKE Big Money steady, high grade coveralls, shopcoats, pants, shirts, sum- mer suits. Advertising on back. Fast sellers. Prospects everywhere. Free out- fit. Strong Mfg. Co., 901 West Jackson, Dept. C-11, Chicago. i WIND Electric Charger. ‘| build them. Simple direct drive. SCREW -HOLDING Screw Drivers! Not magnetic! Remove, hold, insert screws inaccessible places. Factories, garages, electricians, mechanics, radio, autoists buy; no competition! Big profits, Exclusive territories.. Free trial offer! Toolco $062 Winthrop Bldg., Boston SHOP KINKS HANDY Man’s Home Manual. Send 50c to Modern Mechanix and Inven- tions, 529 S. Seventh St., Minneapolis, Minn. SPECTROSCOPES SPECTROSCOPE showing’ sun’s double sodium line, moon’s rainbow, scores brilliantly colored metallic spec- trallines. New invention, postpaid $2.50. Cutting Sons, Campbell, Calif. STROBOSCOPES STROBOSCOPE complete -with electric motor, neon light, and motor book of 100 stunts $1.25. Cutting Sons, Camp- bell, Calif, TRAILERS “WANDERER” Cabin Trailer plans are in 1935 Handy Man’s Home Man- ual, 146 page book chock full. of auto, radio, workshop, home, and garden proj- ects and handikinks, sent postpaid for 50c. Modern Mechanix Publishing Co., 529 So. 7th St., Minneapolis, Minn. TYPEWRITER SUPPLIES 100 SHEETS 8%x1l1_ carbon $1.00. Three ribbons $1.00. Postpaid. Bond Equipment Co., St. Louis. WELDING ARC-WELDING Outfit $1.25. Weld fenders, braze, solder. Lavrow, 4368-W, Warren, Detroit. Stamp appreciated. ALUMINUM Solder Guaranteed 2 bars with instructions $1. Resinger Metal Works, Dept. A, Du Bois; Pa. - WIND BATTERY CHARGER Build your- self from our kit of parts, or send $1.00 large blueprints. orenzen Propeller Company, Niles, Michigan, -WIND ELECTRIC LIGHTS ELECTRIC Lights—Wind Driven. You Auto- matic control. Copyrighted blueprints. Write. Wind Motor Electric, Ridgway, Montana. MAKE wind battery charger for lights. Construction plans 25c (coin). Robert McNeill, Jr., Hopkinton, Iowa.’ Too Late to Classify COINS WANTED—Old Money, Stamps. List 20c. WV, Kellermann, Box 483, Sturgis, So. Dak. HIGHEST Prices paid for Indian Head Pennies. Send dime for list of those wanted. Coin Shoppe, Box 407-MM, Ottawa, Ill. STAMPS SENSATION Packet: Coreas, Liberia, triangles, British Colonials 10c. A. Steele, Springdale, Pa. SUPER-WONDER Packet offered, con- taining 60 different stamps from Yemen, North Borneo, Sarawak, Zanzibar, Eri- trea, Macao, Iraq, Jaipur, French, British, Portuguese Colonies, including warriors, natives, beasts, vessels, etc., all for 5c to approval applicants. Big lists included. Kent Stamp Company, Box 87Z, Brooklyn, New York. MISCELLANEOUS 15 BEAUTIFUL 51 by 8 pictures of famous scientists. Newton, Edison, Franklin, Fulton, Morse, Boyle, Davy, Lavoisier, Tyndall, Huxley, Faraday, Dalton, Priestley, $1.00. Science Studio, Box 845, Water- bury, Conn, Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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pel hielo with This « pt nee OVER 110,000 SATISFIED | CUSTOMERS SAVED 1/3 TO 1/2 BY BUYING DIRECT ‘flidwest Cannot Be Equatled | on BEORE you i buy ‘an write for the new FR. Midwest “Fifteenth Anniversary” tadio 1985 ý many reasons why 110,000 satisfied customers bought their radios direct from the Midwest Laboratories and Springfield, 1U,-1 in- vestigated all makes of radios, and I chose the Midwest. No radio made can equal it. I logged with ease and good volume: LSX, LSN, HJIABB, HJ5ABD, YVIBC— VK2ME, Australia —GSC, GSB, ee Eng.—-DJ. DIC, Ger.—EAQ, Spain, ete. W., C. Geiser, 2260 Yale Blvd. Whee Admires Wonderiut than the direct-to-you laboratory price? You, too, can make a positive saving of from 30% to 50% by buying this more economical way. Learn why Mid- west outperlorms sets costing up to $200.00 and more. Never before so much radio for so little money! Midwest catalog and see for yourself the ae : ; with saved from 14 to 14. Why pay more TRIAL DelixeAudiorium SPEAKER m-fype NEW STYLE CONSOLES you cet Canadian, police, amateur, commercial, air- Conneaut, O.-There is not a better radio than the Midwest. Everyone eays they never heard such a wonderful tone. We bave gotten many foreign stations very clearly. Our Midwest is worth more than we paid for it. Mrs, M. C. Mondy, 179 annann Gots Byrd at Pole Direct Hammond, La.-The greatest distance I have received so far is Byrd at the Pole direct, not a relay through LSX. EAQ and VK2ME come clearly as locals. DJB MIDWEST RADIO CORP. DEPT. = CINCINNATI; OHIO, U.S.A. Established ` extremely well. piven you triple protection with: One-year guarantee, { a ; oreign reception guarantee, money-back guarantee. 50 ADVANCED 1935 FEATURES i SENSATIONAL HIGH FIDELITY RECEPTION --and 16 tubes make this Super High Fidelity This bigger, better, more powerful, clearer-toned, super Radio today’s most powerful long distance re- selective radio gives you absolute realism—asaurcs ceiver, Tts many exclusive features include: Micro- you of life-like, crystal-clear tone—unlike anything P .. oea o o Audio you have ever expericnced before! You will hear one POLOT e e” t Sy E a more octave—overtones—that cannot be brought in Alife Oia takes the easstwerk: out Or tea ee T with ordinary radios. Now, hear every instrument, Midwest guarantees that inexperienced persons every volce, every shade and inflection of speech. Take tan secure good foreign reception. Send for FREE adyantage of the amazing 30-day FREE trial offer. miniature of actual rotating dlal—which clearly Send coupon today for FREE catalog, shows the advantages of these sensational features: ALL FIVE WAVE BANDS 1. pial calibrated In Kilocycles, Megacycles and Only Midwest covers a tuning range of 9 to 2400 meters eers: (83 Megacycles to 125 KC.)—enabling you to easily 2: pall lettere or American Broadcast Statlons and successfully tune in foreign stations up to 12,000 P “3. Slow-Fast, Smooth-Actlon miles away with crystal-clear, loud-speaker reception. Tuning; All 5 Wave Bands enable you to enjoy today’s finest ERA . High Fidelity American programs. In addition, A Station Graup [orate Y arsnell St. C, GSB, come in R. T, Pursiey, plane and shlp broadcasts and derive new delight and Lights; tie Select-0-B: sts a F y de and § elec The Midwest 38- new excilement from unequalled world-wide broadcasts 6 Autematle and pase 1935 cata- . .. England, France, Germany, Spain, Italy, Rus- 7. thuminated Pointer Indicator: 8: Siient Shadow Tuning=im- ictures a sia, Australia, ele. Send today for money-saving facts! i o provement E AT aA dikes rs By 7) complete line of DEAR DIRECT Wik LABORATORIES Aen entrallzed Tuning. k A beautiful, artistic Incrensing costa are sure to result ret a ‘SEND NO MONEY! A deluxe consoles Jn higher radio prices soon. Buy eee wf s and chassis, in before the big advance...NOW... aa 74. While you can take advantage of | ‘| four colors. Write Midwest's sensational values...no : 4\ for new FREE middlemen’s profits to pay. You Y catalog today! ten order your High Fidelity radio d g 7 from the pew Midwest sae OF Z i with as much certainty of satisfac- Midwest dong tion as if you were to select it in range radios our great Teeter, You, M iO bi i | are save 30% to when you buy this popular e priced $ 30 N RES] you get 30 days FREE trial...as ttle as $5.00 down as low b-. E puta a Midwest radio i in your home. Satisfaction guar- ESsosne anteed or money back. Wrile for new FREE catalog. 1920 “Cable Address Miraco. . ~ . All Codes Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 35

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HENRY FORD -X Henty Ford (left) and his son, Edsel, are shown above on top of the administration building overlooking the River Rouge plant, the heart of Ford’s automobile industry. ENRY FORD, the industrial genius of modern times, sees industry entering a vast, wide-open era of experiment, inven- tion and discovery. He believes that in the next twenty-five years man will achicve re- sults overshadowing the dreams of today. This new trend has already begun under the stimulation of Henry Ford’s inventive mind. He is convinced that the farm will be the scene of great industrial development and that chemistry will be the agency by which these changes will be evolved. A start has been made in this direction. Science is discovering means of transform- ing products of the farm into materials for manufacture. Through his experimental farms, Henrv Ford now. successfully con- v automobile E : 30 per cent o astic indus- t agriculture, S possibilities é . AS an ex- é laboratories 1 an a tough, I rial which £ ids without li Canig. 36 An unusual view of Ford plant in Dearborn, part of the industrial empire that has grown up in 40 years. This material is as light as wood and some day may be as hard as steel. The ways in which this new Ford material may be employed are almost unbelievable. It has been developed to the point where it could be successfully used in making desks, chairs, and. other furniture now in daily use. Ford and his chemists envision the time when automobile bodies, houses, sky- scrapers and even great monuments may be fabricated from the soy bean. Those who have the urge to create, to invent and to discover need not be bewil- dered by this picture of the future. Mr. Modern Mechanix .and

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DISCUNES Americas INDUSTRIAL FUTURE In this exclusive interview Henry Ford predicts that the farm will be the scene of industrial development. He points the way to success for today’s inventors and looks upon chemistry as the link between a more prosperous agriculture and industry. by: GLENN F. JENKINS This informal picture of Henry Ford resting in a field recalls his statement: “I have never worked so hard on anything as on the problem of reuniting farm and factory.” lacquers, food stuffs, and countless other things. The protein or bean meal becomes the plastic raw material which can be shaped to suit many purposes. The molding technique, within casy reach of the ambi- tious experimenter, is not complicated and calls for only 2,000 pounds pressure and 350 degrees Fahrenheit. But what of the unknown inventor? How does he fit into such a picture, Mr. Ford was asked. Things are done on such grand scales nowadays. Great laboratories have been built to solve the problems of mankind. In them are the polished minds of the schools. Brains have been regimented. Has the individual been hopelessly submerged? To this Mr. Ford gives an emphatic denial. Henry Ford and his son are shown with first lathe, one of early power tools that turned out first Ford cars. Ford hastens to explain that there is nothing complicated about the new technique. It is based on formulas that are not too com- plicated. The soy bean, for instance, con- tains fats, carbohydrates, and proteins. By a simple process of chemistry these are separated. The fat, or oil, is used for paints, Inventions for December Genius, coupled with a desire to create something, to lessen drudgery and improve our modes of living, need not look far, ac- cording to Mr. Ford. He may start from 37

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Parts for Ford Cars Are Now Manufactured From Soy Bean Products scratch. Every inventor who amounted to anything had to do that. Edison had only two hands and one brain when he began to experiment with one thing and another. Ford had no better tools at his command 40 years ago when he made his first internal’ combustion engine out of a piece of water- pipe, an old flywheel, and some scraps of wire and iron. The contraption nearly wrecked the kitchen sink the first and only time he cranked it. . Chemistry is the magic word Mr. Ford would use to bring about the great develop- ments he visualizes. It would in no way hamper mechanics, but would become an- ether tool of industry. In those two fields, chemistry and indusiry, the chances for inventive genius to assert itself would be multiplied. In Mr. Ford’s realm of activity agriculture and industry are inseparable partners and chemistry is the tie that binds them. “I foresee the time when industry shall no longer denude the forests which require generations to mature, nor use up the mines which were ages in the making, but shall draw its raw material largely from the annual products of the fields,” he declared. “The dinner table of the world is not a sufficient outlet for the farmer’s prod- ucts; there must be found a wider mar- ket if agriculture is to be all that it is com- petent to become. And where is that market to be found if not in industry? “I am convinced that we shall be able to get out of the yearly crops most of the basic materials which we now get from forest and mine. We shall grow annually many if not most of the substances necded in manufacturing. “When that day comes, and it is surely on the way, the farmer will not lack a mar- ket and the worker will not lack a job. More people will live in the country. The present unnatural condition will be nat- urally balanced again. Chemistry will reunite agriculture and industry. They were allowed to get too far apart and the world has suffered by the separation.” It would be within reason to speculate on the possibilities that lie ahead for the ex- At right is the soy bean plant from which the Ford parts shown in the photo are made. The meal is extracted from the beans. This meal becomes a plastic material which can be molded into distributor heads and other parts of an auto. Henry Ford exhibited this “industrialized barn” at the World’s Fair to show how the farm can become the small factory of the future to manufacture semi-finished material. 38 Modern Mechanix and

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Ford’s “Industrialized Barn” Shows Simple Process of Farm Manufacture Here is Henry Ford inspecting plants on one of his farms. He has devoted 39,000 acres to expezimentzl agriculture. perimenter and inventor, but Mr. Ford does not do that. The young experimenter may do that for himself. He may peer into the future and not be surprised to envision many wonderful things. It is within the range of possibility that a formula and pro- cess as simple as that for breaking down the soy bean may be found to extract iron from ore. This could be done at the mines, saving vast sums in transportation costs. This idea alone would be worth untold millions to the man who solved the problem of reducing Jow grade ores by an inexpen- sive method. It is worth thinking about. Cheaper raw materials would reflect them- selves in every phase of industry. Uses for steel would multiply. Reduction of costs would stimulate building. New and simpli- fied equipment would come into use. These Inventions for December This interior of Henry Ford’s industrialized barn showed the simple steps and machinery involved in obtaining oils and other material from plants. are some of the things that are ex- pected to take place. What a field for invention and discovery! Chemists have found methods to convert beets, soy beans, sunflowers, goldenrod and many other plants into practical industrial products. In the back of Henry Ford’s mind re- poses this question: “Why would it not be possible to discover entirely new uses for other agricultural mate- rials?” He believes it to be within the range of possibility to discover a new method of lightening man’s burdens. It would be something that would not dis- place any valuable thing now in use, but would come into existence and find its proper place as did the automobile. Who will make such a discovery? Mr. Ford is working in that direction and everyone has the opportunity of going along with him. He explained that the experi- ments he is making for new and less expen- sive materials are not for personal gain. He has made his fortune, and he wants the world to have the benefit of what he is now able to do in his Iaboratories. He is trying to lead the way out of a complicated mass of high costs and distorted ideas of how to make an abundant and joyous living. On his farm tracts, which embrace more than 30,000 acres of Michigan land, Mr. Ford is producing annually great quanti- (Continued on page 137) 39

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Engineers Rear Scaftold to Save Washington Monument Left—A view of the iron scaffolding, partially completed, which engineers Right—Closeup of one of the lofty working platforms, with Lincoln Memorial shown in the distance. built around the Washington Monument. Smith Shows Amazing Strength [286 hours spent over forge and anvil have made Joe Price, blacksmith of Gloucestershire, England, a perfect example of the “mighty man” made famous by Long- fellow’s immortal poem. Feats of strength impossible for an ordinary man are child’s play for Price, whose massive biceps and bulging forearms are the talk of the country- side. One of his favorite tricks is to grasp ` a 50 pound maul near the end of the handle and swing it like an ordinary hammer. Joe Price, English blacksmith, demonstrates his amazing _ Strength by using a 50-pound sledge as a tack hammer. 40 LARMED by the continued chipping of stone endan- gering the famous Washington Monument (see MopeERN ME- CHANIX AND INVENTIONS, May, 1934), enginecrs have erected a giant iron scaffold to accom- modate workers who are re- pairing the horizontal joints in the masonry. Repairs are to be effected by channeling or raking out the joints to a depth up to 1% in., and filling the quarter inch channels with pointing mortar. This process is expected to halt chipping of the stones, many of which now rest directly upon each other as a result of crum- bling of the original mortar. The scaffolding is built of iron pipe and is so designed that no vertical weight falls up- on the monument. To guard against rust stains on the stone, all scaffold bolts have been treated with lion oil, a paraffine base product. Wireless Supplies Permanent Wave Photo shows patron receiving a permanent wave by wireless in English beauty shop. Heat is controlled by turning dial. EAUTY operators of London, England, recently introduced a new machine which furnishes a permanent wave by means of a wireless apparatus. The revolutionary device eliminates the heavy, cumbersome wires common to the old method and marks a distinct forward step in assuring comfort to the patrons of the shop. , The heat necessary to impart a wave to the hair is supplied from a machine placed close to the subject. No wires connect this machine with the curlers. The volume of heat is under control of the operator at all times, by means of a knob which acts in the same manner as the tuning dial of a radio set. Modern Mechanix and

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Coast AIR TRAM to Make 100 M. P. H. The drawing above shows how the air tram proposed for the San Francisco bay area would look- when completed. A modification of the European monorail idea, the system is expected to attain a speed of 100 m.p.h. with safety. Grinder Reclaims Broken Drills E-POINTING broken or badly burned drills is said to be a simple task with a new, rapid bench-type grinder which elim- inates haphazard methods of hand grind- ing. > During the operation the chuck is swung up and down to produce the proper lip form, while at the same time the cross-slide carries the chuck forth and back so that the drill keeps the face of the wheel true. The grinder is made to fit all drills from 1/16 to 1/2 inch in diameter and produces the drill points recommended by manu- facturers. Photo shows the new bench-type grinder which re-points broken or burned drilis from 1/16 to 1⁄2 inch in diameter, Inventions for December LANS for an air tram system capable of attaining speeds of 100. m.p.h. were re- cently outlined by Joseph B. Strauss, chief engineer of the Golden Gate bridge and highway district, as a means of solving the rapid transit problem in the San Francisco bay area. The air tram proposed by Strauss is a modification of the European monorail sys- tem, but uses two rails for traction plus a third which conveys power and acts as a guard. According to Strauss, the system might be applied to the Golden Gate bridge by suspending it beneath the structure, with- out encountering unusually difficult engi- neering problems and would deliver air- plane speed with surface safety. Device Stops Loss of ee ESIGNED to eliminate an- noyance, a new hinged cap for commodities sold ` in tubes has re- cently appeared. The new cap is easily opened, snaps shut when laid down and is virtually loss- proof. Hinged tube-cap is easy to open and snaps shut when laid down. 4l

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How SCIENCE TRAPPED Above—Albert Osborn, handwriting expert who, after study of ransom notes and Hauptmann’s writing, de- clared both were written by the same man. Right— B. C. Farrar, a government expert who, before Haupt- mann’s arrest, said the writer was a German carpenter. by PETER LEVINS NEVER has science played a larger part in a criminal investigation than in the Lindbergh kidnaping case. From the very night that Charles A. Lindbergh, Jr., was stolen from his crib in Hopewell, N. J., the best scientific brains of the nation have been at work on the meagre clues left by the murderer. Investigators simply had to call in the laboratory experts. The clues were so few that ordinary police work would not avail. All the authorities had as evidence were the ladder used by the kidnaper to reach the nursery; the carpenter’s chisel found near the ladder on the Lindbergh estate; the ransom notes; and, finally, the ransom bills that turned up in New York and vicinity. Every known device of science was used to reproduce, from this scanty evidence, the figure of the mysterious “John the Kid- naper.” That he was reproduced to a most startling degree constitutes a real triumph in modern detective work. The ransom money finally led to Bruno Richard Haupt- mann, German carpenter. It is not at all unlikely even if the ransom money had not led to this suspect, police would have been able to seize the kidnaper through the scien- 42 tific evidence gathered from the ladder, ransom notes and moncy. Before Hauptmann was arrested police had a good picture of the man suspected of the kidnaping. As a result of researches of scientists, they knew their man was a car- penter and a German who probably lived in the Bronx. They knew that the person, who had the ransom money, had buried or hidden it. Even the general features of the man were known through a composite pic- ture drawn by an artist in the Department of Justice from descriptions gathered from scientists and from Dr.-John (Jafsie) Con- don, the intermediary who delivered $50,- 000 to the kidnaper in a New York ceme- tery. The expert who tackled the seemingly impossible task of tracing the lumber used in the construction of the ladder was Arthur Koehler of the United States Forest Prod- ucts Laboratory at Madison, Wis. Koehler is the leading man in the country in this line of work. ` Purely by laboratory methods, combined with his own extensive knowledge of wood, he can find out as much about a piece of lumber as a medical expert can discover by an autopsy on a human body. His tests de- termine exactly in which forest a certain fragment of wood originated. His micro- scope picks out every single mark or inden- Modern Mechanix and

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Lindbergh Kidnap Suspect Above—keg of nails found in Hauptmann’s garage. The nails are said to be similar to those used in the kidnaping ladder. Right—Photo of Hauptmann and below composite picture drawn before his arrest. Note the resemblance. Right below—Col. Lindbergh, with police guard, entering grand jury room. tation. He can tell whether a hammer used in a piece of work was worn on one side, or otherwise marked. He can distinguish every infinitesimal flaw in the cutting edge of a chisel or saw. : He declares that every tool makes a mark as individual as a human fingerprint. After studying the fibre of the wood used in-the ladder, Koehler traced the wood to a particular forest in California. From the forest he traced it to the mill that cut it. And from the mill he traced it—though this final phase of the search took many months —to the National Millwork and Lumber Corp., White Plains Road, the Bronx, where, it later developed, Bruno Hauptmann had worked. A major achievement, this. And done al- most exclusively in the laboratory. After Hauptmann’s arrest Koehler set up a laboratory in New Jersey and set about tracing every stick of wood used in the con- struction of the suspect’s garage, where so much of the ransom money was dug up by the police. The ransom notes produced a mine of information when subjected to the examina- tion of experts. Very carly in the case, even before the child’s body was found, B. C. Farrar, handwriting expert of the United States Treasury, told Colonel Lindbergh that the writer of the notes was a methodical German carpenter. The habit of combining words—“sleepingsuit,” for instance—was (Continued on page 140) Inventions for December

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Vacuum-Type Harvester Eases Cotton Picking Labors Seated on perches a few inches above the ground, workers pick cotton bolls and drop them into funnels. oe STORAGE BIN Suction draws the cotton through metal hose into the blower where the staple is separated from burrs and carried to trailer. EFRA TING on the principle of a vacuum cleaner, a cotton harvester retains cer- tain manual operations but eliminates drudgery for the workers. The device consists. of lengths of funnel- tipped metal hose attached to a tractor whose engine powers the harvester’s blow- er. Seated a few inches above the ground on perches hung from the tractor’s bumper, the workers drop the cotton bolls into the funnels. Suction draws the cotton into the blower where the staple is separated from the burrs and carried to a trailer. If the cotton is to be picked from the bolls, the funnels are replaced by nozzles. Guided by hand, these are placed against the bolls, suction plucking the staple. Electric Reel Has Varied Uses NEW electric cord reel sim- plifies. the job of making connec- tions for lamps and accessories. The compact de- vice contains 15 feet of flexible wire and is fitted with clamps for attaching in any desired position. Photo shows reel and socket clamped in place on a chair. 4A, New Lock Guards Traveler’s Door RAVELERS who find the locking equip- ment inadequate on their hotel doors may insure privacy with a simple device con- sisting of two metal plates connected by a short length of chain. One plate has a set of slots and two hooks to be inserted into the lock hole of door jamb. With this plate in place the door is closed and the second metal piece is forced into one of the slots, preventing the door from being opened. Inserted in slot of metal piece anchored in door’s lock hole, notched guard binds, preventing door from opening. Modern Mechanix and

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Greatest PASSENGER LINER Launched Loer passenger liner afloat, the Queen Mary, known until recently only as No. 534, will be put into trans-Atlantic service in a few months by Great Britain’s Cunard- White Star lines. oe : 1 The huge ship is second in size only to : ^ MiA Near Sas Frances Normandie. The Queen Mary is : : 1,018 feet long, eleven feet shorter than the 7 do French vessel. But it exceeds the Nor- ; so 50 ME PLUMBING mandie in other respects. Its turbo-electric o o plant will develop 200,000 horsepower, 40,000 more than her rival, making her the most powerful ship ever built. Its speed of 30 knots is slightly faster. The Queen Mary can carry 4 ¿000 passengers, compared to Normandie’s 2,170: So large is the new liner that the Clyde river at Clydebank, where: she was launched, was too narrow for her length. Before the launching, the mouth of the - River Cart directly across from the launch- ing ways was widened and deepened to take the liner. The 73,006 ton liner is being built ata cost of $30,000,000. The huge liner Queen Mary (tight) created waves eight feet high when she was launched / into the River Clyde. / Drawings above show the vast amount of equipment needed for the huge liner. It will have 30,000 electric lights. At right is the Queen Mary in the ship yard before launching. The ship was named in honor of Queen Mary who, with the King of England, took part in launching ceremonies. At time of launch- ing the Queen Mary weighed 34,000 tons. A 300 ton gyro steadies her in rough seas and simplifies’ steering. Inventions for December _ l 45

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*500.00 CASH PRIZES Fifty-six prizes, $500 in cash, await readers of Modern Mechanix and Inven- tions in a series of four monthly contests. Each contest will differ from the other. In each one 14 prizes totaling $125 will be awarded. In all four contests readers will have an opportunity to win 56 prizes or $500 in cash! This month 14 prizes, totaling $125 in cash, will be awarded to the best suggestions received on improving a home. Tell as briefly as possible how you would convert an attic into a den, a porch into a sun parlor, an ordinary frame house into a colonial type home, or any one of dozens of possible improvements. You don’t have to own a home to enter this contest. - In your entry describe briefly how you would carry out the construction steps involved in remodeling some part of the house. You will find it easier to confine your entry to one section of the house, such as the porch, the attic, base- ment or roof. Read the rules on the next page. The following article will give you some idea on how to prepare your entry. by DALE R. VAN HORN INGY basements can be converted into luxurious living room or recreation room quarters with such ease and economy that it is becoming the smart thing to do. GRADE LAWN UP TO GASEMENT WALL LIKE THIS ER, TIN, a GPPER,TIN, Joist FCBNG DISC OF Build airways to put windows in low base- ments. Slope lawn as shown, Drawing shows indirect light. Surprising results can be obtained as shown by the accompanying photo- graphs. By simply furring the walls and floor and using any onc of several suit- able materials for the finish the base- Tack wallboard panels to 1x2” furring strips which are fastened SEE JANUARY M-M to the cement basement wall with toggle bolts or cement nails. 46 Modern Mechanix and

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or HOME Improvements This attractive base- ment has an artifi- cial fireplace, natu- ral wood finish, patterned ceiling. ment becomes a suitable place in which to live. Finished with patterned, paneled wall board, you can have a basement that you will be proud to show to anyone. The sim- plest treatment is merely to waterproof the walls, then paint or kalsomine them, cover FOR NEXT CONTEST Inventions for December This basement was convetted into a pleasing den at little cost. The fireplace is covered with log siding and the walls with pine boards finished in their natural color. the ceiling with wall board, then paint or varnish the floors. You will enjoy planning a subdivision of the basement into a group of attractive rooms. Before undertaking the work, re- pairs and a general checking of conditions must be made. Here are several things to look for: seepage through the walls, cracks in the walls, low spot in floor, exposed elec- tric wiring, rotted support columns, and RULES FOR FIRST CONTEST Suggestions for improving any part of a house can be entered in the contest. Cost of home improvement must be limited to $100, not including paint or labor. ` Improvement must not call for professional ser- vices. All work must be within the scope of the average home workshop man. Each entry must include a written description: of 1,000 words or less, giving detailed instructions on carrying out the house improvement. Rough sketches to illustrate suggested changes should be included. Photographs are not required. Modern Mechanix and Inventions reserves the right to publish any entry winning a prize without further compensation to contestant. Each contestant agrees to permit Modern Mechanix and Inventions to publish all or part of any entry not winning a prize. Entries so used will be paid for at regular rates for amount of material published, No entries will be returned. The most useful and practical entries submitted will be awarded 14 prizes: First prize $60.00; second prize $20.00; third prize $8.00; five fourth prizes at $5.00 each; six fifth prizes at $2.00 each; total $125.00. Address entries to Home Improvement Contest, Modern Mechanix and Inventions, 529 S. Seventh St., Minneapolis, Minn. All entries must reach this office before midnight, December 22, 1934. Winners will be announced in the March, 1935, issue of Modern Mechanix and Inventions. An entirely dif- ferent contest offering another $125 in prizes will be announced in the January issue.

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Unfinished Pine Boards Used to Convert Basement Into Neat Playroom Here is another method of using natural wood finish. Pine boards covered with clear varnish hide unsightly walls in this basement playroom, The simple cabinets are built in. loose steps in stairway. Here are some sug- gestions for correcting these defects. Seepage through the walls indicates one or both of two things: that the walls are not waterproofed or that the grading out- side, once properly finished off, now slopes toward, instead of away from, the basement wall. Cracks in the walls and floor show that there has been uneven settling—indi- cating insufficient packing of the soil when the house was built. The low spot in the floor which prevented water from entirely draining to the sewer lead shows haste or carclessness when the floor was laid. If the steps are of wood and have begun to deteriorate, why not end this hazard for all time by putting in new ones of concrete? Wood forms for such steps are easily made by simply building a strong, well braced form with inside dimensions the same size as the complete stairway. The top of each step is left open for smoothing the concrete. The entire stairway requires just one mold into which the concrete is poured. If more light is needed in the basement, the window openings can be enlarged and new sash put in without affecting the sta- bility of the house. And if the home is of the older type, snuggled close to the ground, you can cut openings for the sash, insert sash frames, then build a concrete airway around each as shown in one of the sketches. Each airway should be concrete at the bottom, the corners reinforced with stiff wire, and a drain placed in each under (Continued on page 139) 48 THis siog + OF WALL TO BE Waterproof basement walls on the outside by digging a trench around the house. Lay tile to improve drainage. A wood flooring can be installed as shown in above sketch. IMPROVE, REBUILD, OR REPAIR YOUR HOME WITH GOVERNMENT AID Under the National Housing Act, the Federal Housing Administration has provid- ed means of loaning funds to home owners. Loans of $100 to $2000 can be obtained from any bank, building and Ioan association, or finance company approved by the Federal Housing Administration. Loans are for one to three years payable in monthly installments at not more than 5% interest a year. Assurance required: You must be the prop- erty owner; have an annual income five times annual payment of note; mortgages in good standing; and no past due taxes. Signature of home owner only required. Get further information and interesting booklets from the Federal Housing Adminis- tration, Washington, D. C, Modern Mechanix and

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MOIST AIR is sup- plied by a jug-humidi- fier with a 32 gallon capacity which plugs in- to any electric socket. SUNLIGHT produced by flat fixtures in sides of window dispels night’s dark- ness to create the cheerful illusion of sunlight falling on pane and curtains. JAR CAP—Rubber cap fits into jar and is then held securely in place with a tension spring. STRAINER—This bakelite strainer fits snugly on any teapot, including those which have broken spouts. Inventions for December 49

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California Autoists View Movies in New Open Air Theatre LOUD SPEAKER MOVIE SCREEN 22 ee Above—A general view of California’s new open ait movie theatre. Note how parking ramps are graded to give back seat spectators an unobstructed view of the screen. Loudspeakers are directed at car tops to pro- vide better audibility. Left —A car checking in at the ticket booth of the theatre. OS ANGELES motorists, movie bound, may now sit in their cars and enjoy the latest sound pictures in a giant open air theatre recently com- pleted. The frame which holds the 40 by 50 foot screen is a struc- ture 72 feet high and 132 fcet wide. Three huge loudspeak- ers, each 22 feet long and 7 feet across the mouth, are mounted on top of the structure. These loudspeakers are directed at the tops of the cars, whose soft fabric is said to make an ideal sounding board. The fenced-in spectators’ area holds 450 cars which are parked in lanes graded at an angle so that the cars point up at the screen. This inclination enables back-seat spectators to obtain a unobstructed view of the screen. Projection ma- Midget Tool Kit Fits Matchbox A MINIATURE tool kit, small enough to fit easily into an ordinary safety match box, has recently been completed by a Min- neapolis craftsman. The hammers, hack saw frame, pliers and square were made from nails. Handles for the hammers and the hand saw were tooled out of artificial ivory secured from an old comb. The tiny wrenches are fitted with handles made from pearl buttons. Small files, a hack saw, tap and die and several small drills were used to build the tiny tool kit. Each of the miniature tools is a working model of its full-sized counterpart. Several weeks were required to construct the set. Combs, nails and pearl buttons furnished the materials for this tool kit, which fits into an ordinary matchbox. 50 chines are in a low building in front of the screen, said to be the largest in the world. Installed in a low building in the second row, these machines work at an up-shot angle, instead of the customary down-shot used in indoor theatres. Students Build Model Locomotive Built by North Dakota engineering students, this model locomotive develops 11.5 horsepower at 15 miles per hour. NDER the direction of Professor A. W. Preston, mechanical engineering stu- dents of the University of North Dakota have built a 3,000 pound working model of arailroad locomotive. Built to a 1/5 scale, according to Profes- sor Preston’s plans, the finished model is 38% inches high and 16 feet, 5 inches long. The boiler has 76 one inch tubes with a total heating surface of 11.8. square feet. The sturdy model has a drawbar pull of 334 pounds and develops 11.5 horsepower at a speed of 15 miles per hour. Modern Mechanix and

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INVALID Car Features New 1935 Autos SHOCK ABSORBER i DOUBLE LEAF SPRING z POT This testing de- vice shows Ponti- ac prospects . the riding qualities:of cars. Air cushion’ records bumps orr New independent wheel suspension uses transverse springs instead of coil springs of “knee action” cars. Improved flowing lines are noted in above 1935 Auburn. A governor holds speed to 35 m. p. h. while breaking in. ASSENGER automobiles easily and quickly converted for carrying invalids, feature the advanced showing of 1935 models of automobile manufacturers, The new cars show greater streamlining, use of reserve space for stowage, improved riding qualities, and governors to hold down speed during the “breaking in” period. Studebaker has made its brougham body convertible into an ambulance, designed for country and small town doctors who fre- quently must convey patients to hospitals in nearby’cities. The right front seat of this passenger car can be removed in thirty seconds and the chair-cot put in its place. Auburn has inaugurated the use of gov- ernors on its 1935 models to hold speed be- low 35 miles an hour during the “breaking ”? period. The device was installed to pre- vent ruining the motor with excessive speed. Packard also has gone in for more stream- lining without discarding the hood lines which have identified it for 30 years. The new cars include new bearings, claimed to be a most important engine development. Inventions for December graph as shown. This 1935 Packard shows more stream- lining. Top photo shows spare tire com- partment underneath the luggage trunk. Ambulance cot is shown in place in this invalid car. intro- duced by Studebaker, It is convertible to passenger car. The old babbitt type are replaced with, bet: ter wearing metal. As an aid to selling its cars, Ponting is displaying the “ride-o-graph.” The pros- pective customer rides in the car with his back against a pneumatic cushion that is connected to a stylus which records every irregularity of the road. Anew, independent wheel suspension has been introduced using the ordinary trans- verse spring instead of the coil spring now employed on “knee action” models. No announcement has yet been made as to the manufacturer that may use the method. 5l

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Radio Diviner Helps Diver to Locate Sunken War Relics Raft eguippëd with radio divining rod apparatus and air pumps, is used on Lake Ontario to locate old cannon and other relics of gardy warfare, to be used in re-equipping Fort Niagara. Pump man is holding cannon ball brought up by diver. ANNON balls, guns, and other war-time relics needed to re-equip old Fort Niag- ara are being located by electric divining rod equipment and brought up from the bottom of Lake Ontario by divers. These antiques were used in naval battles just a short distance out from this famous fort dur- ing the War of 1812. Radio signals sent out by a coil of wire dragged along the lake bottom produce an indication on the recording meter aboard the raft whenever a metallic body is passed. Home-made diving helmets supplied with air by pumps but little larger than those used for auto tires, are satisfactory for this work, since the water is seldom more than 20 feet deep. Rural Radio Needs No B Batteries OW cost radio reception in homes not hav- ing electricity is now possible with a midget four tube receiv- er operating di- rectly from a 6- volt storage bat- tery. A vibrator type power unit delivers 200 volts. Midget radio in attractive cabi- net operates from 6-volt storage battery. Drain on the battery is two amperes, one-fifth that of the usual headlight drain on car. 52 Portable X-ray Machine Is Speedy LMOST as fast as 100 Pasadena boys and girls could file in and out of a booth, their chests were X-rayed by what is be- lieved to be the fastest portable X-ray ma- chine in the country. The entire group was photographed in forty minutes. California state health officials, believing hundreds of school children can be saved from tuberculosis by early diagnosis, plan to give every school pupil an X-ray exami- nation by this method. Portable X-ray machine being used by California state health officials to take chest X-rays of school children. As many as 150 children can be examined for tuberculosis in one hour. Modern Mechanix and

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Wrecking Chicago’s Century of “Progress Above—An aerial view of the General Motors and Ford buildings which may be retained as a permanent indus- trial exhibit. Left—One of the sky ride towers, which is expected to re- main as an observation tower and dirigible mast. ITH the official closing of Chicago’s Century of Progress the greatest world’s fair in history—a $44,000,000 ex- position—becomes just another salvage job for the junk men and the wrecking crews. The mammoth exposition is not expected to be razed in its entirety, but just which of the buildings will remain is still a matter of conjecture. Tentatively, however, these structures are expected to be retained: The Administration Building, which housed the Fair’s executive offices, is sched- uled to be the executive offices of the Chica- go Consolidated Park Board. One tower of the sky ride will serve as a sight-seeing tower and a possible mooring mast for dirigibles. The Sears-Roebuck building and the Mayan Temple, proposed as rest houses for the big, lake-front park. One wing of the Hall of Science, to be retained as a convention assembly hall. The Ford, General Motors, Chrysler and Firestone buildings may remain as a per- manent industrial exhibit. The Ford build- ing, for example, was not built for the first year of the Fair, but the second; and into Inventions for December Photo shows the Mayan Temple which will, in all proba- bility, escape the wreckers’ hammers. Present plans are’ „atO Use the elaborate structure as a park board rest house.’ it went lasting materials good for ten years. or more. The Firestone buulding is likewise. built for permanency. Erected as a tempo- rary structure for the first year of the Fair, it was reconditioned before the 1934 open- ing and may be used for years if necessary. Other buildings typical of the exposition, however, such as the $500,000 Travel and Transport Building and the $700,000 Elec- trical Building, will be scrapped. Few, if any, of the numerous villages are expected to remain. Representing a con- struction cost of more than $3,000,000, these structures will net the salvage men little more than the cost of the wrecking opera- tions. The sturdy “stone” walls of the Bel- gian village, for instance, are merely ply- board, three-eighths to one-half an inch thick, nailed on two-by-four scantlings. Fostered by carnival men, a movement is, under way to persuade the Chicago Park Board to retain the rides and concessions on Northerly island as a permanent amuse- ment park. This move is contingent on pol- ities since the island is park property and special legislation is needed to grant their request. 53

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WHY SPEED LOST IN START AND FINISH Sy DIRECTION OF WIND FIRST RACE WINNER ~ ENDEAVOUR. By 2 minutes 9 seconds TIME ~ 3 hr. 43 min. 44sec, FIFTH RACE WINNER ~ RAINBOW By 4" 1" Tie- Shr. 54 5 THIRD RACE WINNER ~ RAINBOW by 3'26" TIME 4 hr. 35' 34" Above is a record of courses followed by the two sloops in ali races. According to the rules races were alternately fifteen miles to. windward or leeward and return and tri- angular with sides of ten miles each. “Endeavour” missed mark in filth and went wide of second mark in sixth race. PEED lost in the America’s Cup Races. The sixteenth international sailing clas- sic witnessed the paradox of an apparently faster ship going down to defeat. Rainbow’s:victory upheld America’s sail- ing supremacy. The British, on the other hand, have only the consolation of knowing that for the first time in 84 years they had an opportunity to bring the “old mug” back to England. The simple statement that America won when Rainbow defeated the British En- deavour four out of six races hardly tells the story. Most experts agreed that the British sloop was faster than Rainbow, yet Endeavour was decisively beaten. Why? Mainly because the comparatively inexperienced amateur British crew bungled so badly in handling ship and sails. The professional American crew made no mistakes. Then, too, experts concede that the British skipper, T. O. M. Sopwith, 54 ‘FouRTH RACE NNER ~ M RAINBOW By 1'15" TIME 3 hr. 15' 38" TOTAL SCORE IN 84 YEARS OF RACES United States Sailed 49 Races; Won 44; Lost 5 Britain and Canada Sailed 49 Races; Won 5, Lost 44. Rival skippers shake hands. can defender (left), and T. O. Harold S. Vanderbilt, Ameti- ' . M. Sopwith, challenger. Modern Mechanix and

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America’s Cup RACES semen VENTILATED SPINNAKER / MAINSAIL Here are principal sails used by competing yachts. Above is the ventilated spinnaker introduced by “Endeavour.” In circle is “Rainbow” with double clew or Greta Garbo jib. At right is “Endeavour’s” Genoa used by both ships in reaching. wealthy airplane manufacturer, could not match the superior sailing tactics of the more experienced Harold S. Vanderbilt, skipper of Rainbow. Both Rainbow and Endeavour represent the best in their class among racing yachts. Both can be termed “mechanical ships.” Both have metal hulls, Endeavour being the first challenger constructed of steel. Rain- bow’s mast was of duralumin; Endeavour’s of hollow steel. The British ship had four- speed winches compared to the American’s two-speed for handling stays and sheets in various wind pressures. The British ship was equipped with two speedometers and an electric wind vane and pressure gauge. She was the first chal- lenger to have these modern improvements. Her skipper was able to see the slightest variation in wind instead of relying on his judgment as in the past. f Sopwith called on the science of aero- Inventions for December DOUBLE CLEW JiB STAYSAIL nautics in rigging his ship. He made wind tunnel tests of a model of Endeavour to dis- cover the most efficient combination of various sails. Handling of these sails proved to be the leading factor in his defeat. The ships this year used jib and staysail in going to the windward compared to the former three headsails. The jib used on both ships is what is called a double-clew sail. The after-part of this large sail was cut off and two sheets attached to make it set better. That made it quadrilateral in (Continued on page 145) 55

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“Chisel” Plow Halts Drifting Soil and Retains Moisture | phe by R. B. Duckett, a farmer from Tyrone, Okla., a new “chisel” plow has proven unusually successful in halting top soil drift and conserving moisture. Duckett’s plow is simply a curved strip of steel, 16 inches long, 3 inches wide and half an inch thick. Furrows are run about 40 inches apart and from 10 to 16 inches deep. These furrows penctrate to the hard pan, bringing up the compact earth which mixes with the top soil to prevent drifting. The depth of the furrows also permits mois- ture to soak quickly into the ground. The ‘“chisels” are attached by four bolts to lister beams from which the moldboards and frogs have been removed. These bolts extend through the plow and along the side of the beam and are secured to metal strips on the back of the beam. Coed Designs $2,000,000 Bridge Photo shows Edith Reed, University of Minnesota engineer- ing student, whose plans for a $2,000,000 bridge won out over professional architects in national competition. DITH REED, 21-year-old student in the engineering department of the Univer- sity of Minnesota, recently astounded the architectural world. Plans which she drew in bed while recovering from an auto acci- dent last spring won out in national compe- tifion and were selected for the building of a $2,000,000 bridge at Omaha, Nebraska. Miss Reed began work on her plans when a friend of the family, president of a Min- neapolis contracting firm, furnished her with specifications for the structure and suggested that she draw up an architectural design to while away the time. 56 Photo shows the deep-furrow plow built by R. B. Duckett, Oklahoma farmer-inventor. Note how narrow steel plow blades are attached to, and fit the curve of the lister beam. Dynamite Used to Study ’Quakes BY SETTING off small charges of dyna- mite, west coast scientists set up minia- ture earthquakes whose actions are record- ed for future study by sensitive instruments mounted on a special truck. E The effects of these explosions, produced by charges varying from one: to forty pounds, are studied by the investigators who have located underlying rock strata as deep as 40,000 feet below the surface. The apparatus also reveals earthquake faults and permits study of the velocity with which the earth tremors are produced. . With this truck laboratory, west coast scientists secure valu- able data on earthquake faults and velocity of tremors. Modern Mechanix and

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ZULUS Jnvented LIGHTNING ‘Rods- Nic Sprank in ODDITIES of SCIENCE Elore watcusernes BREAK IN JUNE THAN ANY OTHER MONTH!- Reason for tists AC, unknownlhe lheory = Vk a, Leal STOTT; d AS common im June, ily Y cause watch Springs} 5 Tobrezk.— ° gai els bert Fitzgibbon, g. Council BI E WI Ze, Water poured on dry peas Git, packed inio log crack will swell oe untl! they splif Oo, — the Jog. Frankin Martin, Choccolocca, Ala. £ Ly CAN EAT CHINESE]. INK AS FASTAS IT LEAVES THE PEN! —/72 waza weather acetic acid ar oxgall is added to drawing ink toprevert Shes from eating it.— A.Lisetsky Ldromten, Alta. Z ULUS HAD LIGHTNING RODS BEFORE AY BENJAMIN FRANKLIN WAS BORN! -Zu/us of South Attic? ave 2 custom OF plicitig MA ther’ Spears in the grozad with the poilus f turned up to protect cattle during & Wm zunderstorni, Benjamin akin E COMMAY called the trveritor of the Lighinijig rod, | © — WDouses Larson, St.Hildaire Mim Win $1! Send your Oddity of Science to Nic Sprank, Modern Mechanix and Inventions, 529 South 7th Street, Min- neapolis. No Oddity will be considered unless source or proof of item is included. Do not include Oddities with letters. Inventions for December 57

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Scientist Shows How Streamlines Determine Speed Ratios Visual proof of the benefits of streamlining are shown in the photos above. Left—-Note how broken smoke stream sets up suction drag at stern of unstreamlined object. Right—How streamlines cut air resistance to a minimum. QCIENTIFIG principles having a direct bearing upon speed ratios—not the mere desire to create unusual designs—are re- sponsible for the growing vogue of stream- lined automobiles. At a recent demonstration at the Frank- lin Institute in Philadelphia, Ray McClar- ren, A. E., Aviation Section, presented a series of graphic tests showing how the shape of an object determines its speed. Jets of smoke were directed against ob- jects of various shapes to give visual proof of the action of the air currents. When the smoke stream was directed against objects with blunt sterns, the air currents were split up, making the suction drag plainly visible. “Tear drop” formations, however, showed virtually an unbroken smoke stream, indicating higher speeds through lessened air resistance. Current Heats Wallpaper Steamer LD wallpaper may be quickly removed with a new electrical steamer which plugs into any light socket. Water con- veyed from the nearest faucet via a long rubber tube is quickly con- verted into steam heating element. ‘The device is applied -to the wall with hand “pressure and is said quickly to loosen any num- ber of layers of paper. Women may easily oper- ‘ate the device. This wallpaper steamer may be plugged into any light’ socket. The device weighs three Ibs. 58 by an electric Newsboy Is Walking Display Rack LOS ANGELES newsboy with an exten- sive motor trade has devised a simple method of displaying his headlines. A copy of the latest edition hangs on his back, held by two paper clamps which are tied to the ends of a short piece of tape, worn around the neck. As he weaves in and out among the auto- mobiles, the headlines are plainly visible to motorists. In addition to stimulating sales, the displayed paper also adds to his safety by making him visible at greater dis- tances. Photo shows how a Los Angeles newsboy stimulates sales by displaying a copy of the latest edition on his back. Modern Mechanix and

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eNlodel Power Boats Race in Wading Pool Above, left to right—Boats race over 75 foot course in 5 foot lanes separated by wooden strips, compete for straight course steering honors-by aiming at a bull’s-eye 50 feet distant and describe a 20 foot are in circular course com- petition by aiming around a flag 10 feet out to hit another ~ marker; - Below—Youthful skippers at the starting mark prepare their craft-for the speed race. Note the guard rails. ONE of the highlights of the Seattle school year is the annual model boat regatta, in which tiny power boats race over measured courses in a convenient wading pool. To be eligible for competition, each boat must have been made in the manual train- ing shops of one of the Seattle schools. Craftsmanship is emphasized and is one of the factors regulating awards; but other- wise there are no restrictions as to the size of the boat or the size and number of its power plants, providing they meet require- ments of common safety. Boats are judged for speed over a 75- foot course divided into 5-foot lanes by strips of wood in the water. These strips keep boats in their lanes and cut dewn backwash which might throw the other boats off their courses. In the straight course steer- ing event the youthful skippers attempt to hit a flag, or bull’s- eye, 50 feet distant from the starting line. The concluding event in- volves steering a circular course around a flag placed 10 feet out and describing a 20- foot arc to hit a bull’s-eye. Ship on Wheels Scales Mountains IRAVELING from West to East Prussia, a small German steamer leaves the water at frequent intervals and literally scales five mountains before the trip is completed. Twenty loeks would be required if the ves- sel were to make the entire voyage by water; but engineers have solved the prob- lem by devising a wheeled carriage and lay- ing sets of tracks over the mountains. The carriage tracks extend down into the canal, making the transfer of the ship from - water to rail a comparatively simple matter. ? Boats touching the flag are dis- qualified. Inventions for December Photo above shows small German steamer mounted on the carriage which conveys it over the mountains, five of which are scaled on complete trip. 59

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Heroism at sea is usually more evident among passengers than crew, declares the author. This woman, survivor of the Morro Castle, braved icy waters by diving overboard from the burning ship. She was picked up by a rescue ship. N THE dark hours before dawn that ter- rifying word “Fire!” aroused passengers on board the Morro Castle from their peace- ful slumbers. In the radio room the opera- tor tapped out the sea’s signal of distress— “SOS.” Within an incredibly short time the ship, a modern liner, was a blazing holo- caust. Passengers and crew jumped for their lives. Some escaped in lifeboats. Some were picked up by rescue ships. A few swam eight miles through the cold, choppy sea to the safety of the New Jersey shore. But when death’s toll was counted, the Few passengers were saved int the lifeboats of the Morro Castle. Members of the crew were predominant in the boats, such as this one, that reached the Jersey shore. 60 CAPTAIN FELIX RIESENBERG An authority on sea topics, Captain Riesenberg sailed the oceans of the world in sail and steam. He is a member of the U. S. Naval Institute and the Society of Naval Architects and Marine Engineers. lives of 132 persons were charged to this latest disaster at sea. The burning of the Morro Castle vividly brought before the public the ever-present danger of fire at sea. That public now looks to the government, to steamship lines and to science to reduce this most dreaded haz- ard of the sea. History shows that one by one other haz- ards, resulting in disaster, have been re- duced to negligible percentages. The sink- ing of the La Bourgogne in 1898 with a loss of 562 lives resulted in improved discipline and training of crews. The collision of the Republic and the Florida in 1909 showed the value of radio and led to its compul- sory use. The loss of 1,517 persons on the Titanic in 1912 after collision with an ice- Modern Mechanix and

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Accusations, protests, and investiga- tions have followed every major tragedy at sea. Will the Morro Castle’s burned hulk leave a lesson for the world? This article discloses the need for greater safety at sea. berg resulted in the establishment of the International Ice Patrol. More recently the Vestris, in which 110 persons met death, showed the necessity of rigid inspection of ships. Radio beacons, echo depth sounders, and submarine bells have reduced the chance of grounding. Fire in the holds and bunkers of cargo craft is now controllable by the use of steam, carbon dioxide gas and foam spreading apparatus. But fires above the cargo holds, in the congested passenger quarters of the most modern ships, are still to be conquered. Fires on the high seas in modern vessels are not unusual and are not among the Inventions for December Above, an aerial view of. the: Morro Castle aftë with rescue ships in the background. The forward end of the ship was scarcely damaged by fire, the officers remaining there safely until taken off by the coast guard. In. lower photo National Guardsman examines undamaged clothes left by- passengers on stern when ship was abandoned.. things that cannot happen. Any “wisp of smoke, the slightest indication of flame, may be the beginning. of a major tragedy. _ The Morro Castle will serve to further drive home a warning and must give everyone a definite sense of the grave danger involved in any fire at sea. Whatever the original cause of the Morro. Castle fire, carelessness, defective wiring, explosive brass polish, oil fumes, or a com-. (Continued on page 135) 6l

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Silver Recovery Process Saves Movies $1,000,000 Yearly Flakes of silver in pile on street were recovered from old film developing solution by new electrolytic process. After melt- ing, they are cast into 60-lb, bars shown at left of crucible. VER a million dollars worth of silver a year is being salvaged by Hollywood movie laboratories. A few years ago this silver, dissolved in solutions used during the film-developing process, was thrown away as waste. A new electrolytic silver recovery proc- ess has been found which will collect ‘the silver washed off from exposed film. The solution is run through a series of boxes, each of which contain a number of ten-inch square Monel metal electrodes con- nected to a direct current supply. Just as in electro-plating, silver is taken out of the solution and deposited on the electrodes. About once a week, when a one-eighth inch thick layer of silver has formed on the plates, they are removed and placed in an oven. Heat makes the silver crack away from the Monel metal in flakes. These flakes are melted into 60-pound bars and shipped to the mint. The solution is then run off into settling tanks, where any silver still in solution will settle to the bottom. From time to time the sludge is dried and sent to a smelter. Garage Capacity Almost Doubled by New Mechanical Parking Equipment UTOMOBILES can be parked into any area so compactly that bumpers and fenders al- most touch, yet driven out in less than a minute with the aid of a new mechanical parking de- vice. The inventor, Eugene S. Taylor of Chicago, asserts that the present parking capacity of any garage or parking lot can be increased as much as 80 per cent with the new equipment. Each automobile is driven on- to a pair of flat steel cars rolling on tracks below the floor. The end flat cars in each row have racks and pinions driven by electric motors. Auto moving units in any row are connected to or disconnected from these end cars by electric control equipment. Any number of cars in one or all rows can be moved sideways a distance of six and one-half feet in seven seconds, to open up a lane for a car at any point. The new system eliminates the necessity of leav- each double row of parked cars in garages at present. Only one lane is needed for the entire ga- rage. 62° : 5 By pressing control buttons of new ing space behind or ahead of pating device, x can move entire rows of cars side- ways 6'% feet to clear lane for car. In upper picture, arrow indicates car to be driven out; below is lane cleared for this car. Auto-moving mechanism is shown at the right. garage attendant RACK AND PINION DRIVE ROLLERS IN TRACK Modern Mechanix and

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“Oaking eMicro-Photos With Your Camera Ce to accepted belief, fascinat- ing. photographs which serve as a per- manent experiment record may be taken by the amateur microscopist with no other equipment than an ordinary camera and a low ¢ost microscope. _ Naturally, expensive machines will give better results but excellent pictures may be secured, nevertheless, : with a miniature model » TSDD and a common box type he initial ‘step | in hooking up the two instruments is to-make or purchase’a rigid, pérfectly aligned stand which will serve as a vertical support for the camera.: A simple, easy+to-build Stand is-shown i in the accom: panying illustrations. The ‘tiéxt ‘step is to make a light screen for the. microscope from a piece of black’ board, from 3-to 4 inches square. Re- maye the ocular from your scope; place: it: upright. in the- center of the card and-trace around it with a pencil. Then cut out the circle thus made, push the ocular through and replace the device in the microscope. Tf thé back of your camera is not provid- ed with a ground glass for focusing, one will have to be cut or purchased. It should lie snugly within the moulding, or frame, that appears just inside the back of the camera box. A light filter which will transmit only . Inventions for December JULIAN D. CORRINGTON, Ph.D. Long considered an expensive hobby, the making of “micrographs i is now. well within the means of amateur fans. This a: how to make valuable records of. microscope experiments with inexpensive equipment. cle tells by Photo at left shows commercial micro-pho- tography apparatus in use. Specimen may be seen up to instant shut- . ter is clicked. Sketches show. construction of rigid, easily adjustable -micro-camera stand. Camera ‘slides up and down in slotted mounting to permit’ . focusing. Use ground glass screen at back of camera. green light from the source of illumination to the photomicrographic outfit should also be made. This is done by inserting a piece of green cellophane between two thin plates of glass, such as lantern slide blanks, and fastening them with gummed tape by the passe partout method. A strong light source is essential. (Continued on page 140) 63

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PREPARING Flush out and clean cooling system with sal soda, then replace all soft or damaged hose connections, before put- ting anti-freeze solution into your car radiator this winter. IROUBLE-FREE winter driving can be obtained only by careful attention to the car before cold weather sets in. Too many automobile owners, putting off necessary winter preparations in the hopes of saving a little money, are caught unprepared by an unexpected cold spell. The cooling system is generally the first to be affected by wintry temperatures. Wa- ter in the lower hose connection freezes, stopping circulation through the radiator. Adding anti-freeze compounds with the en- gine in this condition is worse than useless; the lower water connections must first be completely thawed out. Hot water poured on the outside of the frozen pipes will be found very effective. Covering the radiator front with a blanket keeps some of the ex- hausted steam inside the hood where it may heat the air surrounding the frozen pipes until they thaw enough to allow the water to circulate. The wise motorist PE the cold snap and prepares his cooling system be- fore hand. Of the many compounds avail- able, each has its advantages and draw- backs. Denatured alcohol is used very exten- sively. The addition of a sufficient quantity will effectively prevent freezing at any tem- perature encountered in the civilized world. It does not injure either the engine or radiator, but alcohol vapors or the liquid, if spilled, will attack the finish on a large number of cars. Boiling at a temperature of about 180 degrees, the losses by evapora- tion necessitate frequent additions to the 64 YOUR CAR by PROF. B. J. ROBERTSON Mechanical Engineering Department University of Minnesota HYDROMETER AT 1270--- CHARGED 1150--- DISCHARGED OEDUCT ! POINT FOR EVERY THREE DEGREES BELOW 80°FAHRENHEIT WATER. LEVEL 14 INCH ABOVE PLATES Inspect the car battery weekly during cold weather. Make temperature corrections to hydrometer reading as shown above. Add distilled water before, not after using the car. What Gnti- pear, an Shall J ALCOHOL Denatured Wood or Methanol Most commonly used anti-freeze. Evaporates rapidly on long drives, Cheap, effective if enough is used. Withstands much lower tempera- tures than denatured product. Poi- sonous, with fumes often produc- ing nausea. Does not harm engine. GLYCERINE When pure, does not attack engine or block. Does not evaporate in engine. Mixes readily with water. Cost low. Favorably increases op- erating temperature of engine, de- livering more heat to auto heater. Inflammable when hot, Injurious action on rubber, requiring yearly hose replacement. Remove all wa- ter from radiator before pouring in oils. No. 10 lubricating oil, cheap grade, or crankcase waste, gives same results with less danger of fire. KEROSENE, DISTILLATE, OR LUBRI- CATING OIL STRAINED HONEY Thicker than glycerine. Much greater proportion needed to pre- vent freezing. Extremely thick whea cold, interfering with circulation. Much thinner than glycerine, non- corrosive, and will not boil away in ear. Ethylene glycol mixture (such as Prestone) is ideal for winter trips. ETHYLENE GLYCOL Generally obtained in inexpensive commercial solutions. If engine gaskets are leaky, corrosion may take place. Should not be spilled on electric wiring or car finish. CALCIUM CHLORIDE Modern Mechanix.and

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for WINTER DRIVING With the advent of below-freezing winter temperatures, new problems confront the motorist. Radiator and battery must be pro- tected against freez- ing, oil and grease changed, and consid- eration given to the gasoline being used. A noted authority here tells just how.to foil “King Winter. LOW GRADE—if car starts easy, gives no carbon knocks. REGULAR—if car is hard to start or misses with cheap gas. HIGH TEST—for new high compression cars with good rings. ETHYL—stops knocks. radiator, especially where drivers cover long distances daily. Wood alcohol and Methanol—an alcohol made from coal—are even more effective than the denatured product. A 50% solu- tion of denatured alcohol freezes at 18 de- grees below zero while a 50% solution of wood alcohol does not freeze until 40 de- grees below zero is reached. Wood alcohol is poisonous; its fumes, while not so offen- sive to many as those of the denatured prod- uct, sometimes produce a nausea. Glycerine, when distilled and refined properly, does not attack the radiator or engine block. Be sure that the glycerine you buy is pure. In adding it to the radiator, it is much better to stir the glycerine and wa- ter together in an outside container. Some manufacturers market it ready-mixed with water in cans. When once in a solution with a small proportion of water, it mixes readily with additional water, and may be poured directly into the radiator. Ethylene glycol is being manufactured in quantities for radiator protection. It is much thinner than glycerine, is not corro- sive and like glycerine will not boil away at temperatures more than 150 degrees above the boiling point of water. Only wa- ter need be added during the winter so long as there is no loss by leakage. This anti- freeze is ideal for long winter drives. Calcium chloride solutions are very inex- ‘pensive and may be made freeze proof at 50 degrees below zero. While less corrosive than a salt and water solution, they are very Inventions for December Aids in burning out carbon deposits. Steaming - radiator is sign of careless, unprepared motorist. Put anti-freeze in car early, to be prepared for first cold spell, then check often to keep it at proper concentration. troublesome when used in an automobile cooling system. If gaskets are leaky, corro- sion takes place between the cylinder head and the block, oftentimes making it almost impossible to remove the head. Do not spill the solution on the ignition wiring because short circuiting may result. The radiator and cooling system should be drained and thoroughly flushed out be- (Continued on page 151) 65

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British Bomb-Proof Shelter Anticipates Future Air Raids View of British bomb- proof. shelter being built at Ashford, Middlesex; as seen from tunnel leading into it. Under- ground chamber is 18 ft. deep, 30 fe ban and 40 ft. wide. veinte imaa qpyemete mer fee Folding Ladder Fits Varied. Needs F REAL value to carpenters and painters as well as the average home owner is a universal folding ladder recently placed on the market. . The hinged steel joints are con- structed to permit setting up of the ladder on stairs, slopes, or other awkward posi- tions with no danger of slipping. An ordinary stepladder is obtained by using only the center hinge; the next two hinges give a high stepladder with a plat- form at the top; a horizontal platform which can be used as a workbench in the shop or garage is provided with the two lowest hinges. Photo illustrates use of new fold- ing ladder as plat- form above stairs; at right are other possibilities with the same ladder. NTICIPATING aerial bombing in the next war, British housing contractors in collaboration with the government are constructing a bomb-proof, gas-proof shel- ter in connection with a new housing proi ect at Ashford, Middlesex, England. Located within easy reach of all homes in the new settlement, the shelter will pro- vide refuge during air ‘raids for 300 persons. A tunnel will lead to it from the housing project. The shelter itself is 30 feet wide and 40 feet long, with the floor 18 feet below the ground. Alternate layers of concrete and soil over the subterranean room insure -pro- tection against even the heaviest of aerial missiles.. Upon completion, all signs of con- struction work above ground will be re- moved as an added safeguard. à Eye Ailments Cured by Dry Heat Furnishing dry heat by means of electrically heated water circulating through rubber tubing and eye pads, Elliott treat- ment apparatus reduces congestion and inflammation of eyes. YE inflammations are being successfully treated with dry heat by a new and in- genious apparatus introduced at the annual meeting of the American College of Proc- tology. The electric controlling unit automatical- ly heats and circulates water through hol- low rubber pads held over the eyes by the patient. The temperature of this water is constantly controlled by the physician. Modern Mechanix and

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Tune in by Cities, Not N umbers, on Newest German Radio N ALPHABETIC scale of sta- tions on the tuning dial of German’s newest radio receiv- er simplifies the location of programs from any high-pow- ered transmitter in Europe. Wavelengths, frequencies, and dial settings can be forgotten, and even call letters neglected. A drum type tuning dial to the left of the set has an alpha-. betical listing of the larger cities in Europe, with a letter and a numeral preceding each name. By turning a second knob, a line scribed on the z 1 rowie coma Btasast 1 otnua ji cone tarz 2 west meal 2 Brussen] è gaat eron |? 3 ontrome| 3 Bunn |3 eetowete]y masano |3 onee REG |3 4 postr mans] « LimoGES fa Posen fu norat nartowt|u ROM $ Baestau | 5 mamauaal s sieasspaacl s itmetRG I> vigoeo Is stocad 5 noue M N P, Q R. large tuning cylinder is brought to the specified numer- al under the correct letter of the alphabet on the large scale. This auto- matically sets the tuning condensers to the wavelength of the desired station. The same tuning system can be used on American radios by re-calibrating and re- lettering the dials. Take-apart Comb Is Easily Cleaned Latest type hair comb is easily taken apart for cleaning. COMB which may be taken apart com- pletely by loosening one knurled nut was one of many interesting inventions on display: at a National Inventors’. Congress recently held in Cincinnati. Broken: teeth easily slide out from the grooved frame for replacement. Inventions for December Top: Chassis of new alphabetically tuned radio, with ultra-m: right. Line on cylinder of tuning dial below is set to position by panel knob, Newest Golf Tee Spins When Hit CCLAIMED by leading golfers to give long, clean drives and to di- minish slicing, a new golf tee spins free of the ball when it'is — i - struck. Made of nickel-plated brass, new With the tee golf tee spins around when bali R is hit, folds flat for carrying. pushed into the : ; ground, ball is placed on the revolving arm. Buy Your Popcorn “On the Cob” OPCORN now may be purchased by the ear as well as by the bag. The newest of confection machines follows the proce- dure used in making holiday popcorn balls, but turns out the product in the shape of a cob of corn, wrapped in green waxed paper cut to the shape of corn husks. After the corn is popped electrically in the usual manner, it is mixed with the syrup and placed in wax-paper lined molds. ` In a few minutes the cobs are hardened and ready for sale. Cabinet type machine for making new “corn-on-the-cob” confection. Popping, syrup-heating, and mixing bowls are at front, molds in back. At right is sam- ple “cob” wrapped in waxed paper.

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ł A mixture of charcoal and powder, wired to Redmond’s control board,. provided this thrilling but harmless ex- plosion as movie troops went over the top, Safety is assured the actor-soldiers by construction of the shell pits which are built to expend explosive force upwards. 68 Behind the SCENES on A civilian defends his home during a movie battle; but the machine-gun fires blanks. Dynamite caps, wrapped in cot- ton and tape and fired from control boards by Harry Redmond, shown at left, supply the illusion of bullets actu- ally striking earth a short distance away. by HARRY REDMOND Hollywood Explosives Expert puis forward across a huge battle- field, 4000 movie soldiers, many of them veterans of World war shell fire, quickened their steps as the earth mushroomed sky- wards to the explosion of a heavy shell. Machine-gun bullets furrowed the ground at their feet; shrapnel screamed overhead; great geysers of earth were hurled high in the air as the barrage swelled to a thunder- ing climax. From my firing board beside the cameras, I surveyed the scene with satisfaction. Ev- erything was working out with split-second precision. Suddenly my nerves tensed as a terrific roar tore the very heavens open. Twenty-five large pine trees, previously loaded with dynamite for the effect of shell fire which wọuld tear them from their roots, had exploded ahead of schedule. Redmond’s Biggest Movie Explosion Unwittingly I had provided the biggest explosion ever set off on land for moving pictures—twenty-five cases of dynamite! I had planned to touch off the trees one at a time, but the concussion proved so power- ful that the dynamite went up with a roar, spreading in a few seconds from the middle tree down the line to both ends. Yet so carefully had we notched the trees near their bases that not one man was injured. In two decades of providing thrills of a hundred major battles and minor skir- mishes for pictures I have fired on fully 30,000 troops without a single casualty. Sometimes only a few hundred men ad- vanced through my barrages, while again the “troops” numbered thousands as they went over the top and marched grimly Modern Mechanix and

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Movie BAT ‘Harry Redmond, Hollywood’s war lord, has laid down barrages of high ° “explosives on more ‘than. 30,000° LEFIELDS -movie troops without a casualty: In ` “this article he reveals the. secrets : -of how he wages war for the movies. through what appeared to be a withering fire of high explosives, shrapnel, mines and machine-gun bullets. From “battle organs,” or firing boards, connected through thou- sands of feet of cable, my assistants and I spot these shots to explode within a few feet of the uniformed men, yet the actors are never in danger. I have fought battles not only on the sur- face of the earth, but also in the air and on the sea. The secret of staging these safe but realistic battle scenes lies not only in de- pendable aides and equipment but, more important, in a retentive memory. With a telephone clamped to my mouth I issue or- ders to as many as five assistants who spot the explosions in the background, in the middle-ground, near the cameras, on sides and center, while I stand before my own board closing circuits which one minute rock the countryside with explosions of giant shells and the next splatter the Harry Redmond, explosives expert, ts shown at the elec- trical control board with which he fires on troops as shown in the panel, right above. At the immediate right are mortars used for shrapnel or anti-aircraft shells. Inventions for December 69

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Taming Dynamite to Furnish Authentic Thrills for Synthetic Battles ground around some lone infantryman with sudden bursts of machine-gun fire. The entire battlefield is a safety zone for the actors. They may stand within 10 feet of a mine explosion or actually sit on the tiny explosives which represent bullets kicking up dust, without danger. Through long experience I have learned how to pro- duce effects which look destructive to the cameras, yet the only discomfort they ever cause are ringing ears. Greatest Movie Battle Ever Fought Possibly no greater movie battle ever will be fought than the big push in “The Patent Leather Kid,” which I put on near Camp Lewis, Washington, a few years ago. As I touched contacts on the firing board and gave directions to assistants on the side lines, mines exploded around buildings, tops of trees fell to earth as dynamite tore them loose, whole trees toppled, aerial bombs exploded—a total of more than 15,000 explosions in six minutes. In that battle alone we exploded 8,000 one-pound bombs made of black powder and magnesium packed in cardboard boxes; 6,000 three- and four-pounders; 1,000 five- pounders, bombs contained within bone- charcoal-filled packing boxes; 500 bombs containing from five to twenty-five sticks of dynamite and 500 using one to five cases of dynamite, besides 27 army tanks and in- numerable rifles spitting 50,000 blank cart- ridges over the field. The cost alone amounted to a fortune. We spent $47,000 for ammunition, $8,000 for wire, $300 for switchboards, $1800 for mortars and $7,000 for sawdust and char- coal. I learned then that only a few men are needed to produce a battle equally as realis- tic as the genuine article, provided the “war maker” is given time to lay out the field. I always use the “block system,” that is, lay out the explosives in squares, each square connected with a particular section of a firing board. For a typical movie battle, which may cover a field 3,000 feet deep, nine blocks are laid out, requiring as many as five con- trol panels to handle the thousands of ex- plosives. I mount one beside the main cam- eras on a platform 10 feet high, from which I can observe the entire field. Another is located beside me, a third on the other side of the cameras for firing the machine-gun bullets, while the fourth and fifth are sta- tioned some 2,000 feet distant, just outside the camera line. These fire the larger back- ground pieces, cutting down trees and ex- ploding mines as I direct. Making No-Man’s Land Safe Spectacular and realistic as a battle may appear on the screen, we really take no chances, even though the soldiers may move in three waves exactly as if they were en- gaged in actual battle. Infantrymen fall in- dividually and in groups, not because of in- juries but because they are told to drop at those particular spots. I watch them care- fully, exploding shells behind them or fir- ing shrapnel over their heads from home- made mortars stationed on both flanks. Obviously, we cannot rehearse a battle scene, except to move the troops across the field to time their march. Ammunition costs too much. For that reason I cannot fire on a time schedule. I must watch every soldier and “kill” him from memory. I ‘stay as close as I can to the advancing lines, usually sending up explosives behind them to help “frame” the picture. If a tank comes Redmond’s biggest movie thrill came when six hundred pounds of dynamite which he had planted aboard this old ship exploded prematurely, fired by a shell from the submarine as he was pulling away from the scene in a small boat. 70 Modern Mechanix and

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Movie Artillerymen Fire Paper Shells Over Hollywood No-Man’s Land

Bearing all the grim aspects of reality, this shell-tort waste is really a synthetic battlefield near Los Angeles.

'TO3 WAVES OF INFANTRY AND TANKS START Se See :

NE GENERAL EXPLOSIVES OF .3TO6 STICKS OF DYNAMITE, 2 IN SAWDUST BOXES enn

SMALLER

FOR RGE LA Ej Jex PLOSIVES >

Inventions for December

Not German artillerymen, but Hollywood actors. The shells are cardboard, used against airplanes. Planted explosions “de- stroy” the ground troops a moment later. through I touch off an explosion directly underneath its belly. This is neither diffi- cult nor dangerous, first because I can see the discoloration in the earth where the charge has been- planted and second be- cause the powder or dynamite charge is small and covered with loose charcoal. Sometimes we actually paint the earth black or gray in order to have a contrasting “spot” which may be easily seen. I guarantee safety to the make-believe soldiers both by making sure the explosions will mushroom toward the sky when I hit the switch and by the way they are placed in the ground.. The larger explosives are made of dyna- mite or powder. To get the effect of a shell cutting down a tree, for instance, my as- sistants cut a deep “V” notch around the trunk. The dynamite sticks are packed in the trunk, with at least two caps buried in the dynamite to prevent mis-fire. On ex- ploding, the tree is lifted straight up in the air, to fall in whatever direction it chooses, usually with the wind. (Continued on page 120)

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Sheriff Builds Pivot-Winged Plane Which Fits in Garage Photo left shows bow wing of home-built monoplane pivots at point above cockpit, thus lying parallel with fuselage and permitting storage in narrow garage. Artist Designs Novel “Gallery” THE features of America’s presidents will be preserved for posterity in a novel “art gallery,” if officials of Santa Monica, Calif., approve the plan of a local artist. Fritz Henkels, sponsor of the idea, is a general contractor by trade and an outdoor artist by preference. He proposes to fashion a series of presidential heads which will jut out in bold relief from the cliff below Roosevelt road, Santa Monica. Henkels has already completed an amaz- ingly life-like head of Theodore Roosevelt. The preliminary work is done in clay and is then coated with a facing of cement which acts as a preservative against the elements. This huge head of the late Theodore Roosevelt is the first of a series of presidential likenesses planned by Fritz Henkels, a Santa Monica artist, as a cliff-side decoration. 72 device a repeater. Right—Sheriff Sellmer, the inventor, bolts strut in place ready for takeoff. NE of the most novel light planes ever constructed by a home craftsman is the pivot-winged craft which was recently com- pleted by Sheriff Jacob P. Sellmer, of Marin county, California. The ship follows conventional lines for light monoplane design and is apparently braced in the customary manner. Sellmer’s plane, however, has struts which may be quickly unbolted to permit pivoting of the entire wing. By means of this unusual feature, the wing is swung around directly parallel to the fuselage, with its ends projecting over the nose and tail assembly. Thus the ship is casily stored in a narrow garage and may be transported easily on the highway. Sellmer, who is a fish and game warden, uses the ship extensively to patrol his dis- trict. The novel craft was conceived and built solely through Sellmer’s efforts and required about four years to perfect. Auto-Slingshot Loads Via Handle NCE a small boy’s toy made of rubber bands and a convenient Y-shaped stick, the slingshot has advanced to the status of a minor weapon with the introduction of a shot chamber, or magazine, in the handle which makes the. As fast as one pellet is sent spin- ning through the air, another may be picked from the end of the maga- zine with the leather shot hold- er. The device is said to be accurate and delivers air rifle results. Photo shows. repeating sling- shot. Pellets are fed to shot holder from chamber in handle. Modern Mechanix and

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UNDERGROUND CANNON BLASTS THROUGH STEEL AND CONCRETE TO BRING IN OIL GUSHERS Photo shows underground can- non ready for test shot through three different sized casings. Gun operates at depths of mile and a half below the surface. Result of the test shot, above, is plainly shown in perforated casings. Note gun’s ficing chambers on either side of casings. PERATING at more than a mile below the earth’s sur- face, an electrical depth gun fires forty-five caliber bullets through thicknesses of steel and concrete oil well casing to open up strata of oil- bearing sands which may have been passed in the original run- ning of the casing. In sinking an oil well, the steel and con- crete casing may penetrate and pass oil- bearing strata with potential production capacity. When it is considered advisable to open up any of these strata the under- ground cannon is lowered into the casing and fired at the desired point. The cannon is simply a long steel tube with from eight to fifteen firing chambers, spaced about six inches apart. These firing chambers are “spiraled? so that no two perforations are made in the same direc- tion. The problem of firing the gun through the liquid muck with which every oil well Inventions for December A derrick crew lowers gun into hole. Firing controls are in the suspension cable. The cable drum and the firing con- trols are operated from this truck. hole is filled was solved by an ingenious system of electrical controls. Through the center of the lowering cable is an electrical wire which makes a contact with the base of each cartridge. These may be fired in- dividually, since each chamber has a sep- arate wire inside the gun. A dial which has a contact point for each of the cartridges is rotated by a magnetic spring ratchet, fir- ing the gun on the principle of an automo- bile distributor. The bullets are cased in water-tight steel and are pointed for maximum penetration. Retarded firing, developing pressures above 180,000 pounds per square inch, provides power that will send the bullet through 1% inches of boiler plate. The gun is raised be- tween shots to space the perforations. 73

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Finding Your Way When LOST IG game hunters often must go miles away from civilization as they tramp through the woods and hills seeking deer, moose, and other game. When snow obliter- ates trails and game leads hunters far off the beaten paths, there is a constant danger of becoming lost. , Becoming lost is not as terrible an ex- perience as it may seem if the hunter knows a few simple rules that will help in finding the way back to camp. The big danger of getting lost in the wocds is becoming panic stricken. So great is this danger that a few helpful hints on finding one’s way through the woods will be given before going into a general discussion on guns and tips on hunt- To set a course look at compass, line up three trees as shown. Hunt- ex has selected trees for a southwesterly course. ing such game as deer, moose, and moun- tain sheep. As a precaution against becoming lost carry a good map of the region in which you are hunting. Make this accessory as necessary to your equipment as your gun. If possible, get’ a detailed county map. ` Topographical sectional maps are obtain- able from the government for some parts of the country. Study the map, noting the physical nature, lakes, heights and streams of the region. A large lake may be the center of the immediate region. If you get lost you can climb the tallest tree near you and at once locate the lakè. A railroad running through the region is a certain means of finding your way out. Knowing if it runs east and west or north and south your com- pass will then tell you which way to go. Snow Is Both Aid and Enemy When there is snow on the ground, quite often you can follow your own foot prints back to camp. If there is no snow or if it has been snowing steadily while you have been in the woods, it will be difficult to trace your way back. Trails in the woods can not be relied upon, as: they lead in all direc- tions. Main trails, however, lead to definite places, and can be followed. In the north woods, if your compass shows that a main trail runs north and south, you can be fairly certain of finding some form of civi- lization by taking the trail to the south. Get in the habit, when off the beaten A topographical map is very valuable in the woods. If lost, hunter has several landmarks on above map to get bearings, such as the river, 560-foot hill, and railroad. By climbing tree he should be able to see at least one of these landmarks. 74 Modern Mechanix and

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in the WOODS track, of walking in a straight line, which is readily done by lining up with trees ahead of you. By keeping three or four trees in view it is an easy matter to keep a general straight line. Unless this is done, one is likely to walk in a circle, the common habit in the woods when lost. Trust your compass. If it says North, then believe it. As soon as you realize you are lost, stop right where you are and take stock of the situation. If possible climb the tallest tree around you and look the country over. Without doubt you will observe some famil- iar landmark to guide you. If you decide to walk, break twigs as you go. You can then follow the broken twigs back to where you were if necessary. Fire Your Rifle to Indicate Position If lost, and night comes on, fire your rifle, first two shots, rapid, then one after a little space of time. Listen for answering shots. Keep a fire going and in the day time make a smudge out of it so that the smoke will mount high into the air. Smoke is easily seen in the woods and will be marked for miles in the clear, frosty air. It is a good idea to carry a .22 caliber pistol when hunting in the woods. With it you can kill small game if necessary. A small pocket cooking kit and a waterproof match case are also valuable and can easily be carried in the hunter’s coat. -Hunting deer and other big game found in North America is one of the most thrill- ing of outdoor sports within reach of the average man. In big game hunting the hunter is seeking a quarry more his equal in size. The game is swift of foot and very elusive. It is a sport matching the wits of an animal against the intelligence of man. Deer hunting is the most popular of big game sports. Although thousands are killed every year, deer continues to be plentiful. In some states, where alternate hunting sea- sons prevail, the number is increasing. Careless Hunters Increase Hazards As a result deer hunting has become a sport within reach of all. Thousands who have a car and gasoline, go inio the woods hunting. Consequently the skilled and care- ful hunter is thrown in with the careless and unpractised person. That acccunts for many accidents due to deer hunting. You can help the sport by observing a few simple rules in the woods. Do not fire carelessly in the direction of any noise you hear. Be sure that you see the deer before you fire. It takes only a fraction of a second before shooting for the eye to take in an area ahead of the gun to be certain that Inventions for December

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no human being is in line of fire. When crawling over fences or other obstructions, be very careful of your gun. Thrust it care- fully ahead of you and keep the muzzle pointing toward the ground, not toward the man who has preceded you. Medium-power rifles, such as the .25-20 and the .32-20 are not recommended for deer hunting. Better rifles are the .30-40 Krag, the .250-3000 Savage, the .30-06 Spring- field, and of course the common everyday .30-30 so well known to hunters the length and breadth of the land. An open-point, expanding, high-velocity bullet is best for deer and other big game. It has the power and the shock to kill. Hunting is best after a snow fall. When there is a good tracking snow the possi- bility of obtaining a shot is increased many fold. Added to this, the snow deadens the sound of one’s walk over the leaves. Stalking Deer Tests Hunter’s Skill and Cunning. When no snow is on the ground the drive method is often used. Certain hunters of the party station themselves at command- ing points while other members of the party drive toward them. Generally the deer will break into the open. The wind being toward the hunters posted on guard the deer does not draw scent of them, but does scent the drivers. Naturally they attempt to evade the drivers by running in the opposite direc- tion. This method of driving deer is not highly recommended because there is so much danger of accident. Neither should ` hunters go out in large parties, because the more men there are in the woods the greater the danger. In the drive method when two or three hunters work together, the hunter on guard, watching for the outcoming deer, is posted at a likely runway down which any deer, (Continued on page 130) Beating a trail back to the cabin after a day in the woods is often a ticklish problem for the lone hunter unskilled in woodcraft. 76 In the accompanying text are a number of valuable suggestions to offset the dangers of being lost. Modern Mechanix and

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Intreduced by Spanish colonists as domestic animals more than 300 years ago, the wild boar of Santa Cruz island is today one of America’s most unique and dangerous spe- cies of game. Photo shows hunter with two of the beasts. OMINATING the lonely little island of Santa Cruz, about 20 miles off the coast of Southern California, is one of the most unique species of game to be found within the boundaries of the United States. For Santa Cruz is the home of the Amer- ican wild boar—savage tuskers that are quick to battle man or beast. Weighing up to three and four hundred pounds, the island monarchs are savage antagonists with the viciousness and vitality of a wounded grizzly bear. These fighting animals are not native to the island or the neighboring mainland. They were introduced to Santa Cruz fol- lowing the establishment of Spanish col- onies in the channel islands in 1542. Inventions for December The circular insert shows a close- up of the fearsome head of a Santa Cruz boar. Note the vicious tusks, which often reach a length of etght inches or more. Lower photo—Braving a possible charge, a hunter closes in on his quarry, which, when cornered, will fight with extreme viciousness, Since that time, the hogs have degenerat- ed to the same state of viciousness as that of the wild boar of central Europe. They have fearsome heads, high, bristling shoul- ders and knife-like tusks. Elusive in open country, the Santa Cruz boar is hunted with dogs and heavy rifles. TT

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Yacht on Wheels Furnishes Sailing Thrills to Landlubbers This party of English merrymakers is out for a sail on the beach in a shoregoing yacht with automobile wheels. Organ Creates Photocell Music BUET from a dishwasher motor, an old keyboard and other gadgets, a home- made organ creates photoelectric music. A film sound track of tones is re-photographed on one of two revolving disks. Beams of light shine through these disks and reach a photocell. The light is then turned into _sound, reproducing original tone. Left to right: Joseph Wayne, James Nuthall and Frederick Sammis, grouped around home-made photoelectric organ. 78 ANDLUBBERS who may have secret yachting ambitions yet be dubious about their seagoing abilities may now enjoy sail- ing thrills to the full, tacking and luffing to their heart’s content without ever leaving the security of the beach. Originating at European watering places, sand yachting proved immensely popular and threatens to start a new sport vogue in America. A light platform, capable of supporting the weight of mast, sail and passengers, is mounted on four pneumatic automobile tires. The mast which carries the mainsail is stepped slightly forward, with a bowsprit supporting the auxiliary canvas. The hybrid craft is guided by an ordinary auto steering wheel. With a spanking breeze aloft and a hard- packed beach below, the land yachts skim along with surprising speed. Shatter-Proof Eyeglasses Tested Photo shows the shatter-proof spectacles with glass intact. Subject holds the tool with which the glass was tested. AFETY glass for spectacles recently passed a successful test in London, Eng- Jand. Pounded with a hammer, the glass was marked with myriad lines but re- mained intact. The shatter-proof eyeglasses are said to be especially recommended for athletes engaged in such strenuous sports as tennis, football and baseball. Light Ray Serves as Air Defense IANT light rays of 1,000,000 candle- power may protect cities from aerial at- tack in future wars by blinding pilots of bombing planes. Recent experiments with a 150,000 candlepower projector in France have proved that it effectively blinds the pilot in its beam at a distance of one mile. Modern Mechanix and

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Sea Liner’s Stack Holds Three Locomotives As an indication of the giant size of the Cunard super-liner, long under construction at Clydebank, Scotland, this draw- ing shows three locomotives of the “Royal Scot” type easily stowed within one of the ship’s huge 30- foot funnels. ARGEST British ship ever to be launched, a new Cunard super-liner, is of such gigantic size that three huge railroad loco- motives may easily be stored, side by side, in one of its mammoth funnels. Known only as No. 534, the giant ship has been closely guarded throughout the course of its construction at Clydebank, Scotland. Building details have been kept secret for the most part; and not even the tonnage was known before launching al- though estimates placed its gross as high as 85,000 tons. The size of the ship’s funnels, however, give some indication of the tremendous scale upon which the new liner is built. Each of the three stacks is approximately 30 feet in diameter. This figure exceeds by a few inches the diameter of the famous Holland tunnel, New York City. Another unusual feature of the liner is the manner in which the height of the stacks is graduated. The first funnel is tallest, the third shortest—a device expected to keep the top decks clear of smoke. Round Hand Brush Drains Itself F LAID down with the bristles hand brush auto- matically rolls or tumbles on its side in a drain-and-dry position. The round, ball- like handle fits snugly into the palm of the hand and because of its shape is necessari- ly used every time in a different scrubbing direction. This causes the brush to wear down evenly. Bali-shaped handle rolls brush on its side to drain and dry. Inventions for December upward, a new. Woman Tests New Fireproof Suit O PROVE her faith in the non-inflamma- ble qualities of a fireproof jacket and helmet designed for airmen, Mlle. Biget, a French stunt woman, transformed herself into a living torch. The rest of the outfit consists of a pair of non-sinking overalls which Mlle. Biget will test by crossing the Channel from Calais to Dover, propelled by a portable motor. The stunt artist admits she cannot swim and is trusting her life to the non-sinking qualities of the overalls. Photo shows Mile. Biget, French stunt woman, successfully demonstrating the fireproof qualities of new airman’s suit. 79

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Paris Solves Traffic Problems With Subway Auto Road Photo left shows one of the approaches leading up from Paris’ new auto subway. Right—Interior view of the huge tunnel which is helping to eliminate congestion in Paris streets. Doorways in walls lead to street and shops above. Isolates Million-Dollar Element HE world of scientific chemistry was re- cently amazed by the successful isolation of the rare element, protoactinium, by Dr. Aristid Von Grosse, visiting assistant pro- fessor who has been conducting a series of experiments at the University of Chicago. One of the rarest of the 92 known chemi- cal elements, protoactinium is as costly as it is rare. One ounce of the metal is valued at $1,000,000, and it is said that Dr. Von Grosse’s success in effecting its isolation is comparable to the purification of radium by the famous Curie family. Contemporary workers were given defin- ite proof of the success of the young scien- tist’s experiments at a convention of the American Chemical Society recently held in Cleveland. There Dr. Von Grosse exhib- ited a tenth of a gram of the precious sub- stance, attached to a tungsten wire. The material is silvery in color, radio- active and has rays more penetrating than radium. Dr. Aristid Von Grosse, who succeeded in isolating the rare element, is shown at work in University laboratory. 80 p r with an ever-increasing street con- gestion as the result of a steady growth in both pedestrian and automotive traffic, Parisian safety engineers have solved the problem by building a subterranean auto- mobile road. Wide and well lighted, the auto-subway runs under a large part of Paris and diverts a great amount of both automobile and pe- destrian traffic from the crowded streets. Sidewalks border both sides of the under- ground roadway, affording safe passage to pedestrians. At regular intervals in the tun- nel walls are entrances which lead to stores and to the street level above. This feature relieves congestion in the business district and is a boon both to shoppers and to truck drivers attempting to make deliveries. The subway road is known as the “Hol- land Tube of Paris,” and is only part of the ambitious program planned by French traf- fic experts. Hand Gadget Sharpens Lawnmower ULL lawnmow- er knives may now be sharpened by hand with a simple device pos- sible for anyone to operate. The sharpener, which remotely resembles a tooth- brush, is placed over the knife- edge to be sharp- ened and is pulled along the blade with a steady pres- sure. One trip across the blade is said to sharpen: dull edges. Top photo—Knives are restored by drawing sharpener over them.. Below—Closeup of sharpener. Modern Mechanix and

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Recover Lost OIL TOOLS With Magnet ISHING for oil tools lost at the bottom of.a well has been vastly simplified by development of a powerful electric magnet which recovers objects quickly and surely whenever a contact can be made. The magnet is lowered into the hole on a steel cable which has an insulated copper core. The magnetizing current flows down the core and returns through the steel ex- terior. Lifting power of the device varies with the size of the magnet which is affected, in turn, by the diameter of the drill hole. The magnet is streamlined in order that it may readily penetrate the viscous drilling and reach the lost tool. After making the contact, even under the high hydrostatic pressures of this mud, the mag- net exerts the same lifting capacity as it would at the surface. Enclosure in its own casing prevents the magnet from sticking to steel wall of the hole. Auto Seat Gives Infants Comfort Children may motor in comfort, supported by arm and foot rests in this new seat especially designed for infants. HEN the very young members of the younger generation go motoring, they may now ride in comfort, thanks to a new auto seat especially designed for infants. ' The device is, in effect, a small chair which is placed on top of the regular seat cushion. Side arms give the child support and a convenient footrest keeps small shoes from scuffing the seat upholstery. The seat provides the child with full vision and is said not to come loose or jar out of place. Straps furnish the necessary adjustments. Inventions for December Balanced on a narrow bar, a trio of oil workers demon- strates the enormous lifting powers of the electric magnet. ‘Mummy Seed’ Grows Giant Wheat ITH seed taken from a 5000-year-old Indian tomb, Colonel Claibborn, New Forest, England, has grown a crop of “mummy” wheat of astounding size. Al the seeds germinated and produced a series of healthy shoots which reached an average height of seven feet. New Vanity Case Holds Door Key ADIES need no longer grope at length through their handbags in a search for an elu- sive house key. A new compact holds the key securely in place under a metal mirror until it is ready for use. By sliding a thumb button along a groove in’ the vanity case, the key is quick- ly ejected through a slot. The vanity is a regulation com- pact, complete with metal mirror, rouge and face powder. 81 Photo shows how door key fits snugly into this mew vanity case.

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Police Dog Rides Aquaplane Behind Speeding Power Boat L Photo shows Rex, Belgian ‘police dog, aquaplaning off Atlantic City. Rex seems to enjoy doing his stunts and thinks nothing of performing them 2 half mile from shore. Heating Pad Is Made of Bronze ECAUSE of its bronze construction, a new heating pad need be plugged into the electrical circuit for only a few seconds to heat the pad to a point where it stays warm for hours. The new heating unit is shaped like a hot water bottle and is made of bronze. This material has a tendency to distribute heat evenly hence the pad is of the same temperature throughout. The danger of fire or personal in- jury which might be caused by an electrical short circuit is said to be eliminated with The pad is plugged into the circuit, al- lowed to heat for a few seconds and is then removed from the socket before being used by the patient. Pad is heated by screwing into light socket on regular circuit. New Robot Solves Math Problems NEW mathematical robot known as the “trianalyst;” is expected to solve com- plicated problems in arithmetic, algebra and trigonometry more quickly and easily than a trained mathematician. The contrivance is an uncomplicated mechanical apparatus based on geometrical principles. Its flat framework has the gen- eral shape of a right triangle and contains an inscribed square. The device has been invented by Barrett R. Wellington, a prac- ticing attorney of Troy, N. Y., interested in matheinatical research. 82 the new device.’ NE of the sensations of a recent water circus held at Atlantic City, N. J., was the performance of Rex, Belgian police dog, who gave a demonstration of plain and fancy aquaplaning behind a speeding power boat. The secret of Rex’s success lies in his re- markable sense of balance. Although the plank may skitter across the waves and sometimes bounce him six inches in the air, Rex has no difficulty in regaining his foot- hold. He seems to enjoy doing his stunts and is possibly the only dog in the United States who performs a half mile from shore on the open ocean. Smokers’ Gadget Has Varied Uses SMALL steel smokers’ gadg- et combines bottle opener, pipe ream- cr, stem opener and small screw driver in one. When device is placed on top of bow! tight fit is se- cured when blow- ing pipe out under air pressure at gas stations. Back Yard Well Produces Gasoline OME of the more fortunate residents of Long Beach, Calif., are doing a nice busi- ness in gasoline which has been pumped from their own back yards. Presumably be- cause of seepage from the Signal Hill wells, nearby, a number of Long Beach back yards are fairly rich in gasoline. Presence of the precious liquid was discovered during the drilling of a cesspool some months ago. Since then a number of crude pumping sys- tems have been installed, some of which produce as high as 400 gallons of casing head gasoline in 24 hours. Gadget in this position permits cleaning pipe with air pressure. Device also serves as a reamer. Photo shows Walter Tifft, Long Beach, with drilling out- fit which produces 400 gallons casing head gas in 24 hours. Modern Mechanix and

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SEA GLIDER to Span Atlantic in 3 Days New super liners, eu . Io e planned, will be as fast as: crack speed trains. Here are the two latest designs. This giant ocean glider may be developed from a French engineer’s design. Pusher propellers are mounted above the huge cabin to drive the ship. rat Streamlined model at left was designed by A. E. Northup, of Detroit. ODELS tested in the Seine River may lead to the development of giant ocean gliders capable of crossing the Atlantic in 2% to three days. | Following the design of models of a French engineer, the fast sea liner would have two large pontoon hulls to steady the ship and cut down water resistance. Gaso- line motors and pusher propellers, mount- ed tandem along the length of the hull, could drive the ship 40 to 50 miles an hour judging from model tests. In America Amos E. Northup, of Detroit, famous industrial designer, has built a radically streamlined ship model. Wind tunnel tests with the Northup model show that it is capable of 40 knots, or 46 land miles an hour. A French engineer designed this model glider. He is now planning a full sized ship for. regular -Atlantic ‘crossings. Inventions for December

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Exploring CALIFORNIA’S Neighborhood children call this house “haunted,” for be- hind its modest exterior lies a wonderland of beautiful interiors and strange devices which work mechanical marvels. ‘pee neighborhood kids call it the “haunt- ed house.” It stands forlornly on the street, its cor- roded brown front and ominously shaded windows dusty and forbidding amidst a splash of fine homes and apartment citadels in one of San Francisco’s exclusive residen- tial districts. It isn’t “haunted,” of course. But behind its door lies mystery, with a hollow-eyed wizard wielding a magic wand. For inside the house there are hand- carved -portals that open at a command, unseen flutes wafting dreamy melodies through the rooms every half hour, an organ that plays on an order from a human voice, a telephone that acts as a messenger and a woman robot that plays 3000 tunes on a zither. The Mystery Mansion’s Talented Master This strange house, unique in California, is the creation of Dr. Cecil Nixon, inventive genius and mental giant who lives on a diet of science. For many years he has toiled with no thought of financial gain, sleeping little and working long hours both day and night. A few years ago Dr. Nixon was listening to an organ concert. “T must have an organ in my house,” he said. But good organs are expensive. Hence Dr, Nixon trudged to the public library, ob- tained all available text books on the art of organ building—-and made one himself! Today the mighty instrument occupies a great part of the Nixon basement and is the marvel of San Francisco’s leading organists 84 by DEAN S. JENNINGS De. Nixon, owner of the mystery house, demonstrates one of his illusions—the suspension in mid air of a miniature Taj Mahal. The cord, visible in the picture, has been passed below the model to show that nothing supports it. who declare that its delicate tone is unsur- passed by professional work. Yet Dr. Nixon has gone still further. By installing a num- ber of microphones and an ingenious sys- tem of mechanical control, the organ is made to play at a spoken command. Organ-building, however, is only one phase of Dr. Nixon’s amazing versatility. If he is ill, he treats himself, for he has mas- tered medicine, has a thorough knowledge of pharmacy and compounds his own pre- scriptions. If he has a toothache, he goes to his own office, for he is a graduate of dentistry. If the house needs wiring, Dr. Nixon is a qualified electrician. If the house requires alterations, his com- plete knowledge of architecture and build- ing construction comes to the fore. Rooms and the hallway on the ground floor are of museum beauty, sometimes somber, yet cathedral-like in tone. Walls and ceilings are rare woods, hand-carved by Dr. Nixon with excruciating detail. The Modern Mechanix and

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MANSION of MYSTERY Guarded by weird figures, doors open and a mighty organ plays on command in a house of mystery presided over by a brilliant scientist and a beautiful, life- like robot princess of ancient Egypt. doors, exquisite portraits of wood design entirely hand-made, would excite a connois- seur. Dr. Nixon has applied sculptural ability to the fashioning of gargoyle heads in several rooms and a reproduction in bronze of a Parthenon frieze. Even the floors are inlaid in a delicate pattern. Some of the gargoyles have discs con- cealed in their mouths. The voice, acting on a platinum point which in turn controls a gear arrangement under -the floor, will open and close the doors in mystifying manner. : Even-the telephone is unusual. When the bell rings, the clapper releases a miniature mouse trap and completes an electrical circuit that sounds buzzers in dis- tant rooms. The flute music, welling through the rooms at half hour intervals, is Dr. Nixon’s most recent accomplishment. “The mechanism is simple enough,” he explains. “I took an ordinary watch, re- (Continued on page 118) Upper photo shows one of the gargoyles carved by Dr. Nixon upon his doors. A disc in the gargoyle’s mouth opens the door at sound of a human voice. Lower photo—Isis, queen of the mystery mansion, who plays three thousand tunes upon the zither at a spoken command, plucking out each note with an individual stroke of the metal picks in her hands Inventions for December . 85

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NEEDED INVENTIONS § DASTER BRAKE OR TRICYCLE LOWLY but surely our inventors and re- search workers are pulling us out of the depression with new things that people will want to buy and are buying. Air conditioning, electric refrigeration, and television are the three great inven- tions around which our new prosperity will be built. Added to these there will be thou- sands of little ideas that will help to make our production machinery buzz. The in- ventors who can feed these machines with new ideas will reap rich rewards. Demand for Simple Window Lock Everywhere we look or turn we find new ideas waiting to be developed. It matters little where we are or what our particular training is so long as we do a bit of think- ing. Take the ordinary house window as an example. No really satisfactory means has ever been found to lock these merely because houses have a habit of settling and once a window is slightly sprung or out of tune, the ordinary means of locking are futile. We need a simple lock that will al- ways remain in a workable condition. The inventor who can develop a self- wringing mop which can be used without stooping can sell ten million at one dollar each. (Continued on page 142) 86 SHORT CIRCUIT~ PROOF ELECTRIC. PLUG Modern Mechanix and Unusual improvements of common devicės mean money to inven- -tive men. Secure ad- vice on protecting your idea by writing the Patent Editor, 529 S. 7th St., Minneapolis, Minnesota. Enclose a stamped, self- addressed envelope.

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Modern Science Invents Glass Blackboard for Schoolroom He NG to overcome the shortcomings of the dusty, squeaky, old fashioned blackboards made of slate, scientists have perfected a new writing surface of black plate glass. The glass blackboard permits perfect ad- hesion of the chalk, is easy to erase or wash and is not affected by moisture. An abrasive evenly distributed through the texture of the glass catches the chalk particles, making inscriptions readable. Laboratory tests equal to 100 years of actual service—far exceeding the life of the school- house—left the glass blackboard as good as hew. New Cigaret Roller Fits Pocket This new cigaret roller is small enough to fit the pocket, and is said to deliver perfectly rolled smokes instantly. EWEST of the smoking accessories is a cigaret roller small enough to be car- ried in the pocket. With the hinged lid open the cigaret paper is loaded -with tobacco and the gummed edge moistened. The lid is then closed and the finished smoke ap- pears in‘a slot in the top of the box almost immediately. f Brush Holder Revolves in Wall N ornament to any bathroom is. a revolving toothbrush hold- er which is placed in a recess flush with the wall. The device con- sists of a metal cyl- inder cut away on its inner side but which presents an unbroken surface when brushes are turned inward. Brushes are held in a perforat- ed disk of the con- ventional type which rotates in- dependently of the revolving door. = Revolving toothbrush holder is flush with wall when not in use, protecting brushes from dirt. Inventions for December Photo shows a demonstration of the splendid writing surface offered by the new black plate glass blackboards. An abrasive worked into the texture of the glass makes writing possible. Open Air Ford Has Back Seat Drive ITH the completion of a weird auto- buggy by home mechanics near Liver- more, California, the back seat driver comes definitely into his own. For the strange vehicle, which looks like a buggy and runs like an automobile, is operated solely from the back seat. High seats, carriage fenders and a fringed surrey top complete the buggy illusion. The car’s radiator is partly hidden by a buggy dashboard. Fresh air in quantities sweeps in around the open sides of the. curious equipage, which is powered by a 1926 model T en- gine. Ample space is provided for five pas- sengers. The auto-buggy has a cruising speed of about 40 m:.p.h. and idles down to five. Built solely as a novelty project in a home workshop, the entire construction costs amounted only to fifty dollars. Soe This open air Ford is powered by a 1926 model T engine and is a familiar sight in the Bay region near San Fran- cisco. The car cruises at 40 m.p.h. and was built for $50. 87

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Gfactory-Built “Homes Here is how first of “fabricated”? homes now being made by Los Angeles factory appeared on trailer, completely fur- nished even down to the curtains, ready for moving to exhibition site. Shipped by ruck This one-bedroom cottage, selling for $2,750, can be delivered and set up ready for occupancy in three days. Additional rooms costing about $200 each can be added as desired. Being entirely of wood, building will with- stand earthquakes or moving to new site at any time. If desired, living room is completely furnished as shown before leaving factory. Ceiling has natural wood finish. RE you in the market for a home? Just step into Los Angeles’ unique house- building factory, select yours from the stock of completely furnished homes already on hand, and make the small down payment. In three days’ time the house will have been hauled out to your lot by truck, set up on foundations, and connected -to electric, tele- phone, gas, water, and sewer Jines—in three days your home will be ready! The first “fabricated” house, christened 88 “Honeymoon Cottage” by Mary Pickford, is now on exhibition on Wilshire Boulevard, Los Angeles. It was built complete at the factory, with plumbing, hardware, and fur- niture all in place, and hauled to its site on a truck trailer at a speed of 12 m.p.h. These houses are designed to permit the addition of extra rooms at any time. An ex- tra bedroom, costing around $200, can be fitted to the home in a day or two. Built to withstand storm and earthquake shock, as well as the strains set up by mov- ing, the houses are constructed entirely of California redwood, with knotty California pine instead of plaster on the walls. There is another advantage to these fac- tory-built homes. In case you want to move, the factory sends out a few service men, who jack up the house onto a trailer and move it, furniture and all, to a new site anywhere in the country. Modern Mechanix and

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FORD "T" Suggested arrangement of parts for power supply unit. Adjust rheostat and contact points until unit iş delivering maximum out- put. Old audio transformers may be used for filter chokes by placing coils in series. Fo? short wave sets, portable camp receivers, small trans- mitters, and other low power ra- dio apparatus requiring less than 200 volts this.spark coil power supply will be found useful. Op- erating directly from a 6-volt auto storage battery, it will deliver a practically pure direct current when prop- erly adjusted and filtered. The output will compare favorably with that of the vibrat- ing power supplies used on many car radios. Get a standard Ford T spark coil; replace- ment coils often are wound differently and would not work in this circuit. Other parts generally can be found in the radio scrap box; the power transformer should have a 5-volt winding capable of carrying at least 6 amperes, and a center-tapped high voltage winding wound for 600 volts each side of the tap. The turns ratio for the transform- er must be at least 7 turns per volt; other- wise the current will be too great and vibra- Inventions for December 7 FORD "T" SPARK COIL SECONDARY; NOT USED) _—————POWER TRANSFORMER PRIMARY = 5 VOLT WINDING, AT LEAST 6 AMP RATING, ——~SECONDARY ~ HIGH VOLTAGE _ WIND- ING WITH CENTER TAP Circuit diagram for vibrator type power supply delivering up to 200 volts. tor points will be ruined quickly. Make all connections exactly as indicated in the sketches, soldering each joint care- fully. Mount the entire unit in a wood box, making it as sound proof as possible. Adjust the vibrator contacts until they give off a high-pitched note, and test with a voltmeter to determine if this is giving the highest output. Keep the vibrator points clean, removing pits and irregularities oc- casionally with a fine emery stone. Separate wires should always be run from the storage battery to the filaments of tubes in the radio set, to prevent any pickup which may make the set noisy. 8)

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alk on 5 METER WAVES Hold phone conversations with friends on lakes, at camp, or in the city, as far as ten miles away, with this compact but powerful ultra-short wave combined transmitter and receiver. ONLY a few years ago radio transmission on the five meter band was a rare thing. Today ultra-short wave sets are giving hundreds of fans a chance to operate their own transmitters and enjoy the thrills of amateur radio without putting out hun- dreds of dollars for equipment. Designed especially for MopERN MECH- ANIX AND INVENTIONS readers, this 5-meter ANTENNA pINSULATED POSTS /~4_,PHONES f ALUMINUM PANEL 5" WIDE $3" HIGH Pa as TRA > OUNTING HOLES on Uy, ~N REGENERATION CONTROL MTG. Lay out and drill 14” thick aluminum panel as shown above. All parts are mounted directly on this panel or set off from it with brackets and studs. Audio transformer mounts on two studs, condenser insulating panel on two, coil on one. At right: Use of fiber washers as insulators. Í ANTENNA POST 7 OO MFD. TUNING CONDENSER 90002 yes 100,000 OHMS 300 TURNS # 32E./ - OUND OVER SEC. FS N OF AUDIO TRANSF. "30 TUBE i A f SWITCH 5 G OHMS Q Q MICROPHONE 77 GROUND TO PANEL A [+A 3 VOLTS Circuit diagram of M-M Transceiver. Remove laminations of standard audio trans- former, wind on extra turns for microphone input as indicated, then re-pack Details of coupling coils and transmitter tester are shown at right. laminations. 99 10,000 OHMS j 100,000 OHMS ~ combination transmitter and receiver can be built from standard parts for about $5. Many fans will be able to salvage parts from old battery receivers. The tubes, batteries, headphone set, and carbon microphone complete the setup. Actually we have here a private telephone system, with a range up to ten miles. With one set at home or camp, and another mounted for portable use, telephonic con- versations can be carried on from your car, boat, or even while hiking. For portable use the set may be mounted in a metal tool box or overnight bag. Special small batteries should then be used to cut down weight. _ The transmitter-receiver is mounted en- tirely on an aluminum panel 5⁄4” x 5”, which also serves as chassis and ground. No ground wire is used. The arrangement of parts is novel, but radio experimenters will recognize the transmitting unit as a split Colpitts circuit modulated by a ’33 pentode. With the switch thrown for receiving, the ’33 tube be- comes a stage of audio fre- quency and the transmitter a receiver operating very much like a super-regenera- tive set. O PHONES O Sol, , 33 TUBE T- À j B+ 135 VOLTS Modern Mechanix and

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with M-M TRANSMITTER Microphone and audio transformers have been. combined to save space by winding between 250 and 300 turns of No. 32 enam- eled copper. wire over the secondary wind- ing of an ordinary audio frequency trans- former... If desired, a manufactured trans- former serving exactly the same purpose can be had for around one dollar. The transformer and tube sockets are mounted on metal or fiber studs to eliminate body capacity. The small tuning condenser is mounted on a strip of bakelite which in turn is held away from the panel by studs. This condenser should be no larger than 20 mmf. (.00002) in order that the set will tune down low enough; this size generally will have seven plates. Sockets are of the wafer type, mounted as shown, with the coils located between. The coils are wound with No. 14 or No. 12 plain or enameled copper wire. Both. coils have 5 turns wound on a %” dowel or pipe form. When removed from the form the coils will open slightly, giving the cor- rect finished inside diameter of about %”. Spread out the windings to leave about 14” space between each turn. (Continued on page 122) NOTE: + WIND 300 TURNS OF + 32 ENAM. WIRE OVER_SECONDARY OF AUDIO TRANSFOR- MER FOR MICROPHONE WINDING. E —— e Batteries, phones, microphone are easily connected to transceiver if above scheme is followed. Use any single button carbon hand microphone having a built-in switch. j as : rl+i35 ae a Tea | ; by THOMAS A. BLANCHARD 3~ 45 VOLT BATTERIES USE 4 FEET OF WIRE > D BL = Se SS © ~ EARPHONES 0,000 OHMS 100,000 OHMS Perspective diagram shows location REGENERATION / 4 3 VOLTS) >, INDICATES and wiring of all transceiver parts. CONTROL” GONNECTION TO Connect A=, B= leads to panel at 100,000 OHMS PANEL, any point. Upper microphone bind- ing post is not insulated from panel. Inventions for December 91

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Ordinary Voltmeter Measures Filter Condenser Capacities CONSTRUCT. GRAPH USING A ” CONDENSER OF KNOWN. VALUE oO TO 50 VOLTMETER CONNECT UNKNOWN CON- N 110 VOLTS A.C. DENSER TO Mount meter, bulb, and switches on test panel. Light bulb gives indication of condition of condenser; meter gives rating. Use 0-50 volt, solenoid type B-battery testing meter. Gadgets Make Wire-handling Easy HERE a multitude of bends are to be made in stiff wire, a bending jig will prove a time-saver. By hinging two hard- wood blocks together, cutting a notch cor- responding to the desired shape of bend in one, and a projection of the same shape on the other, an inexpensive but handy jig can be made. It will be found useful especially for bending bus-bar wire for radio sets. Heavy wire is pulled taut readily if gripped with a holder made from an old auto brake rod. Run the wire through the loop, then ‘wrap it two or three times around the shank. © WIRE BENDER oo - HEAT “AND SHAPE THU Fig. 1 shows wire bender in use. Design is readily changed if other shape bends ate wanted. Wire puller in Fig. 2 is forged from old auto brake rod; heat before bending. 92 , PERATING directly from 110 volts, a.c., this simple circuit will test and measure quickly the capacity of radio filter conden- sers. To calibrate the tester, connect a con- denser of known capacity to the X posts, close switch 1, open switch 2, and observe the meter reading. Plot this reading on a graph, then draw a straight line through the point and the zero of the graph. In testing unknown condensers, close switch 2 and open 1. If the bulb glows brightly, the condenser is shorted. If it re- mains dark, glows faintly, or flashes for an instant, open switch 2, close 1, and note the meter reading. Pick off the correspond- ing condenser rating from the graph. Control Voltage Without Rheostat ‘30 TURNS + I8 D.G.C. WIRE POWER TRANSFORMER WOUND ON BAKELITE { \ SECONDARY TUBE 3" LOI Gy 1q' DIAM. PIPE x Z 4 LONG SLIDE PIPE IN OR OUT TO VARY VOLTAGE "This voltage regulator for filament transformers is mainly choke coil connected in series with transformer primary, with adjustable iron core to vary effective a.c. inductance. pFEAMENT transformer voltages are low- ered easily without a rheostat, by insert- ing this adjustable choke in series with the transformer primary. By changing the posi- tion of the plunger with relation to the coil, varying voltages can be obtained easily and quickly. Wind 30 turns of No. 18 double cotton covered wire close together upon a length of 1% inch diameter bakelite or cardboard tubing. Fasten the ends of the coil to bind- ing posts mounted on a wood base made for the coil. The plunger is a four inch length of iron pipe just large enough to slide inside the coil form. Force a wood handle into one end of the pipe, or bolt a handle to a pipe cap fitted over the end. The iron core changes the effective inductance of coil in proportion to distance it extends into coil. Modern Mechanix and

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Heat Lead and Sulphur to Make Radio Crystals IRYSTALS of the galena type, used extensively a few years back for crystal radio receivers, can be made in a few minutes by radio experimenters. Only a small piece of lead and about a gram of sulphur are needed. Place a piece of lead about the size of a pea in an old teaspoon, heat until the lead melts, then add one gram of sulphur and stir the mixture with a piece of wire. Allow to cool, and use the resulting black metal exactly as you |z HEAT LEADS ADD SULPHUR Ù would a crystal.—c. K. Jones. CONTROL TRAINA BUTTON; TRACK PRNO E SECONDARY Ac. : EA I CIRCUIT 7” RED Í I o Lames LIGHT lee 5 5 Automatic Signals for Toy Trains e ee a oe win semaphore and track signals of your model railroad connected as shown in this circuit green lights will show when the train is running, red lights the instant the train is stopped. As many signal units GREE! ; : : ; LIGHTS SIGNALS as desired may be connected in parallel with this automatic control circuit. Connect all red lights across the control switch for your train—this is usually mounted on the transformer. All green lights connect between the center and one of the outer rails of the track. If desired, signal lights can also be mounted on the control board. Christmas tree lights pee a Electric Time Switch ADE with a 5-cent mouse-trap, a 20-cent knife switch, and a 60-cent alarm clock, this electric time switch will turn off signs, poultry house lights, or other electric circuits at-any desired hour. The bell hammer on the alarm clock trips the mouse-trap trigger, which in turn flips open the switch Henry Westfall. work with most transformers.—Glenn G. Godwin. wong arot st Reversing Switch for Small Battery Motors ELECTRIC MOTOR UITABLE for reversing battery-operated toy trains and con- struction set motors, this polarity changing switch is easily made. Saw flanges off a large wooden spool, then drive a tight- fitting dowel through center. Mount spool on a wood base and attach a small radio dial. Now drive two rows of four brass conTacT | ey RA | headed tacks along length of cylinder, and connect pairs of wiae TO l 5 tacks. Arrange four strips of spring brass on baseboard to con- BRUSH by od” —L. B. Robbins. Use Battery to Cut Glass Gos tubing can be cut easily and smoothly by rolling on a red-hot length of stovepipe wire stretched between two nails driven into a board. The wire is heated by running heavy copper leads from the nails to a storage battery. For con- venience, a knife switch may be placed in series with the battery. With thick glass it is often necessary to start the cut with a file, or even put a few drops of water on the glass after it has been heated. If a 6 volt battery will melt the wire, then use either 2 or 4 volts.—R. F. Jennings. Inventions for December tact tacks, and connect two to motor brushes, two to field coils. #10 COPPER WIRE STORAGE BATTERY

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Camera Kinks Aid Amateur Photo -Taking STRIP OF SPRING BRASS ~ 4”X 1/2” X .008 CELLOPHANE BETWEEN TWO LAYERS OF CELLULOID N 1/2” BOLT LEATHERETTE Sea PICTURE. FRAME THREE LAYERS OF TAPE PREVENTS BOLT FROM TOUCHING SPRING Use scene appraiser made of alternate layers of celluloid and blue cellophane to reduce any scene to monochrome which camera actually records. Make opening about 8’'x10’’. Draw cross-lines in India ink on celluloid. Study the scene with one eye, holding 12” away, then train the camera on the selected scenery. WIRES TO FLASH LAMP Simple synchronizing switch for taking photo- flash shots will work on any camera shutter operated by standard wire release. Construct switch and contacts as shown, and adjust upper y2” bolt so it touches head of lower bolt at same instant camera shutter: opens. Connect the switch in series with photo-flash batteries. Shading disc, about 34”' in diameter, is sol- dered to length of piano wire and mounted in handle of discarded hand dental tool. Springiness of wire keeps disc in motion while shading parts of picture in enlarge- ment printing. Add coat of black enamel. With mirror mounted on simple wood framework, right-angled time photos can be taken with any cam- era. The mounting is especially useful for photographing bloom- 25"X | /2”X 1/2” ing plants from a vertical angle. a Hi Fi 94 Modern Mechanix and Washer for rinsing negatives or prints is made from pieces of wood. Box tilts back and forth con- tinually as water drains from one side, fills up in other, giving complete change of water every few minutes. Use asphaltum paint for inside of box. Set the washer directly under a water faucet.

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Dancing Wooden Pears Surprise Guests IPS en YEN out two pear-shaped wooden balls on your E a bee DE ee lathe, connect them with a rubber strip, and watch fs?) them perform! Starting slowly at first, the pears we chase each other round and round, reversing a few AS times and perhaps even rolling over each other to y finally come to rest. Before cutting off the pears, sand them well and varnish. Place a small screw eye RS gar ete SE in the small end of each, and connect together with a SHOWING BALL ` 20” long rubber band. To wind up, roll one pear PAST ASTON along table while holding the other.—Dale Van Horn. EAR ROLLED ALONG FLAT SURFACE Pipes in Ground SZ =% À TO WIND RUBBER Hold Xmas Trees Cnet of vacant lots in any city can rent their sites on a percentage basis to Christmas tree venders if they have properly prepared the ground before it freézes. If short lengths of two-inch water pipe are set into ground at perhaps three foot intervals about the lot, they will be found ideal for supporting almost any size of Christmas tree. Allow the pipe to project a few inches above ground, to keep out snow.—Weston Farmer. Make Match-box Chest for Your Workshop SEFUL for storing small articles which are easily mis- placed on the study desk or even for holding small parts on the workbench are these miniature 4-drawer chests. Select four empty small size match boxes and glue the covers to- gether as shown. Mount on a cardboard or wood base and paint.—Elmer Kellerman. MATCH BOXES GLUED TO- GETHER PAINT IN +} Wallpaper Decorates Boxes e, AINTY wastepaper boxes which match your guestroom walls are easily made by pasting floral wall- paper cutouts on neatly constructed plywood boxes. After assembling the box, cut out the selected wall- paper pattern, lay it face downward on newspapers, and cover with paste. Allow a few minutes for the paste to soak in, then carefully press down on the \ wood. Flour and water paste is made by adding paste Guy bur ERATION boiling water to flour, stirring, and allowing to cool. ON BOX AND RUB SMOOTH \ —C. J. Bronson. |] SESS PLYwooD 42" STRIPS CUT WALLPAPE! FLOUR AND WATER PASTE FROM INNER TUBE | Repair Chairs With Rubber ANE bottom chairs for the cottage or camp can 74” STRIPS OF RUBBER ; ENN be neatly repaired by weaving in strips cut from RS a discarded auto inner tube. Tack 14” wide strips of rubber underneath on one side, run over the top of the chair seat, and bring underneath on the other side for tacking. The strips should be stretched be- fore being tacked down permanently. By carefully ‘weaving in the cross pieces, a neat and springy seat which will be even more comfortable than the old cane covering is obtained. Large head tacks, commonly known as carpet tacks, will prevent rubber tearing from support. A coat of lacquer or enamel of any gay color may be applied to the rubber.—J. C. Kauffman. Inventions for December 95

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E NA WMO spunog jo mo wnd yesaye-y esed wnpayl puesseg sUIN}IW AT pazdasiajzuy mwe N aa e ba Dv Playing charts can be cut out and pasted on stiff cardboard. 96 Le PT p L244 ~~ i=} aya CO O b nAn ea Ae -_ a bs g] wo ZZ G x EAE om Ane oo bid o © O2002ZZwOZOnWZO Osha wo F c-9 . N-5 TD HOZ Om~r my A a y N = o m T TT 1 E n ZHAZOZAZwWA 04 BAH onw A O84 OW a Oe Z20n4aN2ZnA4Z0 H N= N m ell see N el ed el SIARPNHURBEN AA u w H m a BO DARFONK WS ONWOD AMWOUwWONAD a N Kn p X h ONAN oow by J. R. JOHNSTON Every play of footbal! is possible with this thrilling new gameboard. Plays are called, dice thrown, results read off from charts, and the football moved as chart indicates. yes football game has been so simplified that even a ten year old boy can play it. In spite of its simplicity, however, every standard play of a real football game is pro- vided, from straight line plunges and end runs to tricky lateral and forward passes. `- In perfecting the game, statistics of every standard play in 100 college games were studied and averaged, to form a basis for determining gains or losses. Because of this, we believe the game conforms more close- ly to actual football than any other on the market, So accurate are the play charts that it is possible to kick a 55-yard field goal, close to the record for the longest goal ever made from the field. It is possible to complete a long pass for a gain of 56 yards, also close to the record. Likewise, a pass into the end zone can be completed for a touchdown, or intercepted and run back 50, 77 or 100 yards, the latter resulting in a touchdown. Thrills and “breaks” are just as prominent as in any real game. The game costs practically nothing to make, and takes little space. It consists of a 26”x15” miniature gridiron, two charts of plays, a football, downs markers, and a pair of dice. The charts are cut out and pasted on cards so that each player or “team” has a set of plays and results to call off. Fifteen columns are provided in the charts, two of which are for dice numbers. The 13 remaining columns contain figures Modern Mechanix and

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WITH “VARSITY JR.“ GAME ‘SQA LL NVY=ZLU “ANITGAZ 40 GY3SHV SI NYA d1 SS07 SI LNG JININ GYVA Z S,LNSNOddO OL NVY—TALY TIVGLOOS YP ALISUVA,ONIAWId NI 3SN SIOGWAS SYMBOLS USED IN PLAYING “VARSITY JR” FOOTBALL FR—FUMBLE RECOVERED. BL-BLOCKED. BL-TD- BLOCKED, CAUGHT IN AIR BY OPPOSING TEAM.. Layout of gridiron for football game. Spaces between white lines may be further divided into individual yard lines. Grid should be laid out on white paper, painted green where black above, with numerals in red or black, and sheet then pasted down evenly on light plywood. for 16 different plays, with the field goal kicking formation being used for points after touchdowns. + With an alarm clock set to mark 5, 10 or 15 minute periods, whichever desired, the game proceeds like an actual football con- test. Choice of goal and kickoff is deter- mined by a throw of the dice, high winning. The dice are of different color, the red in every case showing tenths, the other hun- dredths. Thus, on the kickoff from the 40 (Continued on page 120) CUT FOOTBALL FROM ORANGE PASTEBOARD --DOWNS MARKER AND DOWNS TALLIES FROM BLUE PASTEBOARD OF | _THREE-PLY WEIGHT.. MAKE | FOOTBALL THUS DOWNS MARKER (l REQUIRED) a + DOWNS TALLY MARKER Full size patterns for ball and markers are shown above. Downs marker will cover 10 yards on full size game board. Downs tal- lies are moved to proper nu- merals at each side of board to indicate correct number of down. for December Inventions “G3NMOG =Q “SONNOG JO LNO=-GO “AL IWNAad —d ‘NIYO Y0 GOOD — 9 “NMOCHDNOL YOJ NVY—dLY 15 INCHES SYMBOLS USED IN_PLAYING_“VARSITY JR” FOOTBALL C= COMPLETE. N=INCOMPLETE. J— INTERCEPTED. L—LOSS. F= FUMBLE -BALL GOES TO OTHER TEAM. PLAYS FOR OFFENSE ssed əuoz pug ssoquInNy qUIog JO} JHH 120D PPI ANOnNUONH H w AMIOOQIQOQ pP a w mOZOZBzARzazzzazazyzaza = ArMPonowouwohrowurwmepAoTouwa 0 1 0 3 2 0 3 2 0 1 L A k) a x u W22Z08 t=] eHow ANMOANATNOANAADAAAAABRADWAAA a omu 000220 onssactupromuctouw a a |s] Call offensive plays from these charts, then throw dice. 97

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Sliding-Pipe Drill Press Is Powered by a Ford Generator Z A z A MODEL "T” z SFX GENERATOR é I" PIPE SPRING P 3 | \ Sketch shows construction of low-cost drill press for home workshop. Motor-driven chuck mounted on pipe slides up and down as operator changes pres- sure on foot pedal. Instructions for converting model T Ford generator into 110 volts a.c. motor appeared in both the May and September, 1934, is- sues. To avoid electrical shocks, be sure that a.c, line does not touch generator at any point. Line Shaft Uses Ford Bearings T ounn a line shaft is almost a necessity in a workshop, many hesitate to install one because of the expense. Experience has shown that %” galvanized pipe is strong enough for shafting in most shops. It so happens that this diameter of pipe will fit nicely into the roler bearings of a Ford rear end. Cut the bearings off from the housing with a hacksaw. The brake shoe mounting holes will be found convenient for bolting the bearing housing to either bench or shelf supports. i Blocks of wood are bolted tightly to the shaft between bearings to stop end play. The pipe should be polished with either sandpaper or a fine whetstone at points where it touches the roller bearings. = 3⁄4“ PIPE _| || BEARINGS CUT OFF BEARINGS OF MODELS To REAR- Mounting for line shaft using old auto bearings. Wood rings take up end play. For longer shaft use 3 bearings. 98 FORD generator converted for 110-volt a.c. use Serves as power unit for this in- expensive but serviceable drill press. The drill is fed by foot lever, leaving the hands free to hold the work. The drill chuck is mounted directly on the generator, after turning down the shaft slightly in a lathe. The generator is then mounted rigidly on a length of 1-inch pipe, either by welding or by using strap iron clamps and bolts. Drill table and the top pipe support are screwed to a 2”x6” upright which is fast- ened to a wall or to the end of the work- bench. A spring fastened to the top of the pipe and running up to a ceiling joist is ad- justed to hold the drill a few inches above the table. With the foot pedal hooked to the lower end of the pipe the drill is easily controlled. By placing router bits in the chuck, carv- ings of panels for furniture can be done. Celluloid Sheet Is Grinding Mask SERVICEABLE substitute for goggles when working on an emery wheel can easily be impro- vised from a sheet of celluloid or cel- lophane. The sheet of transparent ma- terial is held in place by slipping underneath a cap which is put on backwards. Clear vision is afforded on all sides, with no discomfort to the wearer, and eyes are protected from flying grit. Celluloid or cellophane mask slipped under cap keeps dust and grit out of operator’s eyes, yet gives no discomfort. Stop Sticking of Desk Drawers HE annoying sticking of desk and dresser draw- ersin damp weath- er can be abol- ished by placing a small electric light bulb in each draw- er, and turning the current on for sev- eral hours. Larger bulbs should not be used, since they will warp the wood badly. Place 25-watt electric bulb in damp drawer for several hours to relieve annoying sticking. Modern Mechanix and

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CURES for NOISY AUTO BRAKES Clean inside of brake drum with gasoline to remove grease. On most cars wheel and drum will come off together without using puller if hub cap and axle nut are first removed. Mot automobilists detest squealing brakes, yet few realize that they can be made noiseless without cost or much man- ual effort on the part of the ordinary car owner. Usually noisy brakes are caused by grease and dust accumulating on the brake linings. In the springtime, the winter bearing grease, if not replaced in time by the proper summer lubricant, will leak down into the brake drum and cause the above mentioned trouble. . Treatment Applies to Any Car If noisy brakes are due to this, the fol- lowing simple operation—used and recom- mended by expert automobile mechanics— will restore the brakes to their former silent state. The treatment will require about 20 minutes a wheel and will be essentially the same for both front and rear. Proceed as follows: The entire wheel and outer brake drum must be taken off. This is done by removing the cotter pin and lock nut holding the wheel to the axle. The wheel will then slide off, tire, rim, and all, if pulled firmly and twisted back and forth at the same time. In a few cases, where the brake drum has not been removed for some time, it will be necessary to use a wheel-puller. ` Brake Shoes Are Easily Removed To insure easier handling, the brake shoes should now be removed. Remove the spring holding the shoes together by grip- ping at the upper end with pliers and stretching upwards and outwards. Remove the lock washers at the opposite ends of the brake shoes and the shoes will come off. Now one of two methods can be followed: The brake shoes can be washed in gaso- line until the grease and dust have been removed from the lining; or, if the grease Inventions for December Brake shoes are readily removed for cleaning. Before re- placing, wash off all grease from brake housing with gaso- line or kerosene. GASOLINE BLOWTORCH © Where brake lining is so badly glazed that gasoline will not remove grease layer, carefully heat with blowtorch un- til glaze is softened. File off all rough edges on lining. is imbedded too thoroughly to be washed away, it can be burned from the lining with a blow torch or ordinary flame. Care should be taken not to burn the lining excessively. Regardless of which method is employed, the inside of the brake drum should be washed clean with gasoline. In case the squealing is not caused by grease or dirt but by something apparently undeterminable, the following procedure often proves effective. The upper outer edge of the brake lining should be filed down slightly. Only the edges should be worn away. Any ordinary file will be suit- able. Proper Grease Stops Further Squeals Of course, if the brake lining is glazed and completely worn out, it will have to be replaced. Otherwise the above men- tioned operations will, in most cases, en- tirely eliminate the objectionable squealing. After the trouble has been remedied, care should be taken to use the proper lubricants in bearings and grease cups to prevent the grease from again leaking into the drums. 99

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WIND WITH COPPER -| 'WIRE AND SOLDER ails: 3" is CABLE -Atb OTHER CABLE “TERMINALS THUS PIN THRU MAST HOLDS STAYS — SEE DETAIL OF CABLE LOOP ABOVE ~ DETAIL OF BOOM YOKE

DETAIL OF RUNNERS AND ANGLE a IRON SHOES T . MAST STEP ŠCREW WITH ‘ See ee AS HEAD CUT OFF is 3 Yy BOOM 10-0" i 2" DIAM. SS. STRAP IRON / = ELECTRIC N CABLE CON- { : DUIT MAKES = Lee SHEET LEAD. á y | | BEARING BLOCK ıl" . SHEET —— >À s | | DEEP x 23" wip 30 y f SEE TILLER Á E DETAIL OF a MANILA f DETAIL ) > NA \ FRONT END SOLID BACKBONE TAPER TO 3" HERE / < f L EYE i|| 3" WIDE AND 13t ot \ FORESTAY RUNNER PLANK j : i| LONG IS TAPERED SS =F OWN \ 16 134'%10" X10" LONG ze) ater = ’ Ea) a 60" EYEBOLT l8" 7 BRACING CABLE\ Z Rg x a AK = E A =

FPAWEND TAPER TO TURNBUCKLE, Do HERE

P 2" x 2-0" OAK BEAM ` : Z HAS 2" ARC A N i ee MAKE 4 ae ANGLE IRON% HOBBLERS, 8 2 MACHINE BOLT 2 HOBBLING.SPACE Se 3 Y Sat So 8 ; ANGLE IRON HOBBLER = $ CARRIAGE , l screw. BOLT CROSS SECTION OF DRILL 2 HOLE : ——— FOR KING BOLT Io == ————— SIDE RUNNER BEARING

Assembly of front-steering iceboat is shown in center drawing, with construction details at sides. Professional sail- maker will make sails directly from above sail plan. After making backbone, first-step is to put plywood cockpit floor in place, locating 10 inches from rear end. Light wooden slats are sewed into sail at approximately 214-foot intervals. 100 Modern Mechanix and

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Gront- Steering ICEBOAT by JULIUS J. FANTA HERE are three distinct advantages in building and sailing this front-steering iceboat. It is simple to build, costs less than $28 including sail, and most important of all, will not spin on the ice. Safety is the keynote, since this type cannot possibly spin out of control. With the rig scientifi- cally balanced by the designers, capsizing is reduced to a minimum. This forward runner craft, the latest thing in iceboats, is cat-rigged (one sail) and has 75 sq. fect of sail. It can easily be sailed at up to 50 miles an hour, perhaps more, in an 18 mile wind. Two persons can be carried in the cockpit and two more on the runnerplank adjoining it. By carefully following instructions you will not only have a handsome boat, but one which will stand up for many years of thrilling winter sailing. The use of clear, straight-grained spruce throughout is advised. If spruce is not ob- tainable, pine, but preferably fir may be substituted. Spruce and fir have greater strength and flexibility to absorb jarring on unsmooth ice. Use only brass screws when necessary to use screws. Nails should be avoided. The plans show a criss-cross affair, the reverse of the more familiar Hudson River type which is steered with the rudder at the stern. A solid backbone 13’x6”x3” should be tapered at both ends from the maststep where greater thickness is needed f T WELD $ " CROSS PIECE Foam. 7'62 SAME AS ON STEEL ROD TILLER POST WORKING FIT FOR RUNNER BEARING BLOCK CROSS ARM FOR RUDDER POST DRILLED FOR 3/4" POST 3" STEERING CABLES ARE CROSSED AS SHOWN CROSS ARM FOR TILLER POST DRILLED FOR 5/8" DIAM. POST Here is the front-steering iceboat in action, skimming over ice before an 18-mile wind at 50 miles per hour. Slight changes were made in plans after this boat was tested. to withstand the down-pressure of the mast. The runnerplank is 10’ long, 10” wide and 1%” thick. The mast measurements are 18’x4%)"x2%"; it is raked or tilted aft two fect off perpendicular. The bottom of the cockpit should be of half-inch plywood, 6 fect long, two feet (Continued on page 126) BEARING BLOCK | 2" DEEP, 3" WIDE DETAIL oF STEERING POST_ASSEMBLY & qn ~€— BEARING COLLAR 12 DIAM. WELDED TO POST DETAIL OF THE TILLER & TILLER POST FITTING DRILL. FOR SHACKLE = Rudder post and tiller details. Crossed steering cables are necessary with front-steering runner to permit tiller to move in same direction as operator on turns. Hardwood tiller swings up or down in bearing block, which in turn bolts to tiller post. Inventions for December 101

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ON | Solder-lever Kink Removes Auto Body Dents / TSE removal of dents in parts of the auto body which are not readily accessible from the inside presents a different problem. Remove enamel from the damaged area, sandpaper, and apply a light coating of solder. To the center of the hollow solder a strong wire bent at Tight angles. Form a hook in the free end of the wire and insert a bar to act as a lever; lifting on this should snap the dent back in place. Remove the solder with a blow torch and touch up with enamel. Dents in refrigerators can be repaired in the same manner.—Curtis H. Wilson. Handy Desk Fits Over Steering Wheel ANY uses will be found for this handy little hinged desk which can be slipped over the steering wheel, ready for use, in a jiffy. The hinged arrangement enables the desk to be stored in some odd corner of the car when not in use. Three grooved chocks, fastened to the back of the desk boards with screws, fit down over the spokes of the steering wheel. Spring clips swinging over the slots in the chocks hold the entire assembly snugly in place. The chocks must be ar- HEAT OF BLOW— ranged to fit——J. A. Emmett. TORCH EXPANDS NUT Loosen Rusted Nuts With Torch UTS that cannot be loosened by a wrench or by dous- ing with kerosene will in most cases come off easily after being heated with a blowtorch. Direct the flame on the nut until the metal has expanded away from the bolt. A tight-fitting wrench should be used when working on a heated nut, to prevent damage to the softened metal. Bolts with screw-type heads are removed in the same manner. It is usually a layer of rust which binds nut and bolt together.—John S. Carnes. Locating Engine Noises With Screwdriver ITH this simple device the sounds made by various parts of an automobile engine can be isolated and listened to. Troubles due to worn valve springs, loose timing gears or worn bearings are accurately spotted despite the noise of the engine. Get a long screwdriver and a tin can with one end open. Touch the screwdriver blade to the engine, rest the bottom of the can on its handle, and listen at the open end of the can. You’ll be surprised at the queer noises.—R. F. Jonesik. Check Front Wheel Alignment Regularly to Prevent Excess Tire Wear o IS-ALIGNMENT of front wheels means TIE STRING hard steering and excessive tire wear. To check “toe-in,” jack up front axle and spot tire with chalk to mark high spots due to wheel wobble. Lower the jack so that high spots are at the bottom. Stretch string across wheels on one side just under the hub caps and adjust to make front wheel parallel with rear. If the “toe-in” is correct, string on other side will touch front tire at two places.—R. F. Jennings. Modern Mechanix and

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“Do You Know How to “Run a Gurnace? Diagram at right shows typical arrangement of draughts in furnace. Use plenty of wood in starting fire, allowing embers to form before throwing on coal. Keep grate free of clinkers. THE home furnace is a simple device for obtaining the maximum possible amount of heat from coal. Its operation must, how- ever, be clearly understood to obtain the best results. Open the lower draught door, close the check draught in the pipe, and open the lit- tle grill on the stoking door when starting a fire. This breather grill allows fresh air to flow across the top of a newly stoked fire, preventing the formation of gases which might cause an explosion. After the coal has stopped smoking and is burning nicely the breather door may be closed. With the check draught closed and the draught door open, build up the fire until it is level with the stoking door. You can- not heat a house economically by carrying a low fire; it is hard on the grates, and burns fuel so hotly that clinkers form. Furnace Has Three Draught Controls The bottom draught door through which the air passes to the ash pit is an important check. Closed, only a small part of air can get up through the fire box. If you wish to check the fire further, open the check draught located in the stove pipe between the furnace and the chimney. This draught allows air to go up the chimney without passing through the fire. With the door draught open and the check draught closed, the fire is in posi- tion to burn best. On gusty days, when the wind creates an unnatural draught and the fire is hard to control, there is a damper in the chimney which can be partly closed to further restrict air passage. This damper should normally be left wide open, except perhaps in warm weather when the fire can- not be checked in any other way. i At night the fire should be well shaken down, the fresh coal piled on, the breather erill left open, and ashes piled atop the fire to restrict the rate of burning. The check draught is left open, but never at night or at any time after freshly stoking the fire, should the check damper be even partially closed. Inventions for December WHEN THIS CHECK DRAUGHT |i IS OPEN THE AIR DOES NOT PASSI} THRU FURNACE BUT DIRECT INTO CHIMNEY HENCE DRAUGHT IS — | "CHECKED" > > > > — = BLAIR OR WATER JACKET |i HIRE BOX], a] CLINKER DOOR- If -FAIRLY GENERAL GRATE SHAKING ECHANISM M DRAUGHT: a ASH PIT 7 (GENERALLY SUNKEN TO INCREASE DRAUGHT, , mpeg BREATHER GRILL OPEN | ='STOKING DOOR CLOSED|E | ASH DOOR CLOSEDIES DRAUGHT DOOR OPEN |p SETTING FURNACE FOR FIRING WITH SAFET YA ALWAYS KEEP FIRE BOX FULLY FILLED Ba) NEVER SHAKE FIRE. |A | MORE THAN ENOUGH |B ba) TO SHOW A FEW RED a| ASHES ~TOO MUCH [|i ie) SHAKING WASTES THE H| COAL THAT IS BURNING M| BEFORE YOU |E P J ALWAYS |N RAM FIRE To |È BREAK. UP |$ A| CLINKERS 8i a| LE TAIR IN) DONT, TRY TOHEAT |§ OUSE WITH A LOW IRE ~ BURNS GRATE |} Te S| FEW LIVE COALS |i è =. OR BURNS OUT GRATES TE Re NEVER LET ASHES |E FUELING AND ASH PIT MAINTENANCE When starting up furnace in fall see that all door joints seat tightly. Air leaks can be located with candle flame, and closed with furnace cement. Steel wool stuffed around shaker rod will reduce leakage at this point. Check damper should be left alone except on days when you absolutely have to re- duce draught. Open breather grill only when starting up. 103

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Six Novel SUGGESTIONS FLOWER POT COVER made from small pieces of wood will beautify unsightly clay pots, giv- ing novel setting for any plant. Drill holes in carefully beveled wood strips, assemble with beads and elastic, and apply lacquer or paint. EVERLASTING CANDLE burns for hours with bright flame, yet always is same height. Glue cardboard or tin cylinder 24’’ long by 4” thick to wood base, set in kerosene tin with wick, and finish in red enamel, ribbon, and white wax. Aun Lee tay we \ Wea O . FASTEN WITH SMALL WIRE ¥ GLUE BANDS ~ BRAD N A N TAA BOOK ENDS with novel inlaid designs are made by nailing thin strips of different colored woods together, PA a Ky sawing out design on jig saw, then interchanging TY N i pieces to get multi-colored effects. Finish with clear 5 = `; = = lacquer, after mounting on wood or metal backboard. — 54". 104 Modern Mechanix and

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for CHRISTMAS GIFTS Add that personal touch to Christmas gifts this year by making them in your own workshop. Among the plans shown here are appropriate gifts for family or friends—and their cost will be very moderate. Finished in gay lacquer, they spread real holiday cheer to all. WHISK BROOM HOLDER with comic face brings many a chuckle from users. Paint features in with black paint, then add dashes of color to mouth, nose, and ears. Hang by screw eye on nail in wall. w ENT COLORS i i NT RABBIT, J PARTIAL END VIEW PANEL AND BOX DIFFER =f “SCOTTIE” DOOR STOP is cut from layers of plywood, then glued together and finished with heavy coat of plastic paint textured to represent fur. TOY CART teaches little children to make rounds of house, picking up toys at end of day. Plywood overlays in animal designs are glued to sides of cart, then painted. Wheels are turned from pine or hardwood, then fitted with bushings. Assemble with wood screws. Inventions for December 105

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“Blackboard Desk Delights School Children

Sliding desk brackets enable blackboard to swing down, forming convenient writing desk. One side may be screwed to window frame, other to wall studding. Small shelf just below the blackboard holds chalk and an eraser. If carefully prepared, blackboard surface will be just as satisfactory as if heavy slate panel were used. PRCEERLY decorated, this sturdy and useful combination desk and blackboard becomes a handsome piece of furniture. Being adjustable in height, children do not outgrow it. It can be hung conveniently on any wall. Clear, finished pine will do nicely for this desk, and will be very easy to work with. Saw out cach part to the dimensions given, slightly round the corners and edges with a plane, and carefully sand every face and edge. Use screws throughout for the assem- bly, drilling and counter-sinking holes so they may be covered over with wood filler Jater. One of the most pleasing of finishes is a dark oak or walnut varnish stain. After this is dry, sandpaper lightly and apply a coat of white or orange shellac. Again sand- paper and finish off with clear varnish. The blackboard is given two coats of flat paint, sandpapering after cach, and finally: two coats of “Blackboard Slating”—a liquid which can be bought at paint stores. The desk is fastened to the wall with two long wood screws, after locating the wall- studding by tapping on the plaster. Place large washers over these screw heads. 106

18 /2'<— ` Lumber required for combination blackboard desk: One piece 1/'x10'’—8' long; one piece 1’’x16’’—2’ long; one piece 14''x4’'’—4' long; six feet of 1/’x2”’ pine to go under each shelf. Use clear white pine. Test Tube Heater For Aquarium HERE tropical fish are kept in a home aquarium, it is often necessary to raise the temperature of the water, es- pecially during winter nights. A heater consisting merely of two strips of copper dipping into a test tube filled with water, and connected to 110 volts a.c., will be found ideal for small aquariums. By placing the copper strips closer to- gether and by adding a bit of salt to the tap water in the test tube, the heating effect can be increased. Add water occasionally, since it is continually decomposed by the cur- rent. The heater acts as its own thermo- stat, for the heating effect is proportional to the amount of water in the tube. WIRE HOOK

4 P E TEST TUBE Construction of aquarium heater is simple. Fasten small in- sulating block between copper strips at top with sealing wax. Modern Mechanix and

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An Overhead Wire System for Toy Trains Photo above shows model railroad on which both third rail and overhead wire are used, supplying power to two trains. NOT SOLDERED TO CONTACT BAR EFQ EF Fh SAFETY PIN Zz YA, 1% of on = BOLT INSULATING SY EZ J STRIP TO ROOF OF TO MOTOR A LOCOMOTIVE CAB SOLDER Make pantagraph with dimensions indicated. Flow solder over top of contact bar. Springs should not be too stiff. BY INSTALLING this simple overhead wire system on your model railroad layout, two locomotives can be operated independently of each other on the same block of track—one getting power from the pantagraph and overhead wire, the ether from the usual third rail. Regular schedules of freight and passen- ger service can be carried out in a realistic fashion on the same line; the blinking red and green eyes of the block signals will take on a new importance, for they will have to be obeyed if accidents are to be prevented. The steadying effect of the pantagraph on turns will permit a decided increase in speed, and give the overhead wire system an advantage even on single train layouts. Here the third rail can be used to supply current for train lights, insuring that they Inventions for December Hold busbar wire in proper place with cork while solder- ing towers and pan- tagraph assembly, USE SQUARE RADIO BUSBAR WIRE THROUGHOUT OVERHEAD. | WIRE NO. 14- BARE COPPER | | Construction of wire-supporting towers is made as simple as possible. Finish equipment with “Blackboard Paint” to give weather-beaten appearance, Locate towers by trial on curves. will be on when the train is stopped. The pantagraph is made up from radio busbar wire, with safety pin springs at the joints: The base and current collector strip are cut from sheet copper and soldered to the assembly. Cross wires which brace the pantagraph assembly can be ambroided or soldered in place. The assembly is now mounted on a bake- lite insulating strip cut from a radio panel, and fastened to the roof of the engine cab. The wire leading from the motor to the third rail contactor is removed and sold- ered instead to the pantagraph bolt. One overhead wire supporting tower is needed for each section of curved track and for each two sections of straight track. 107

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Screen Door Hook Holds Window Sash Up N WINDOWS where the sash cord has broken or was never attached, an ordinary screen door hook can be used to hold the sash rigidly at any desired height. The latch of the hook is cut off at the bend, and the end filed to a sharp point. The screw eye is then turned into the bottom of the window and finally set parallel to the glass. After the window is raised to the desired height, the sharpened latch is pushed into the frame enough so it will dig into the wood. On heavy windows it will be best to use one of these latches on each side of the frame.—Ralph Anderson. Fasten Shade to Roller With Adhesive Tape WINDOW shade won’t pull off its pole if it is fast- eee TARE ened with adhesive tape instead of with tacks. The white waterproof type of tape in either 14” or 1” widths is thinnest yet of adequate strength, and therefore best for this purpose. Shades already tacked down, which are beginning to show signs of tearing from the tacks, can also be reinforced with tape—Frank S. Hajicek. yr Fasten Key in Door Lock KEY SHANK peo? keys will not be lost by children if they are fastened permanently inside the lock. To do this, remove the door knob and the escutcheon plate. Now pass the door key through the key-hole in the plate and slip over its shank a split washer. Replace the plate and knob. This kink can be used only on closet and basement doors which are always locked from the same side—Emil J. Novak. Home-made Hige Holds Four Pair of Trousers Meiers pee readily made from a single piece of quarter-inch metal rod, this trouser hanger will hold four pair of pants, each of which may be removed without disturbing the others. Bend an eye in one end of the wire, and make folds back and forth in a grid network as shown at the right. These folds are spaced just far enough apart so they will slip under the cuffs of the pants.—A. T. Williamson. Can-opening Keys. Make Ice Tray Releases HOSE who have owned the older faves of electric refrigerators know what trouble a frozen ice tray can make before it will come out. A thin film of ice collecting at the bottom of the tray is the cause of this trouble. The trays are easily loosened, how- ever, if one of the opening keys coming with sardine cans is slipped under each when the water is put in. Twisting the key loosens the tray at once. If keys are round, flatten with hammer.—c. F. Hall. Stop Shoe Tongue Slip ae SOET leather tongues in the high shoes often worn by children || roncue “Here have an annoying tendency to slip to one side. The remedy is simple, and takes onły a minute. Punch two small holes near the top of each tongue, locating them so they will come in line with the top eyelets. Thread one of the laces through these two holes before bringing it through the top eyelet, and the tongue will always stay in position.—John G. Fleming. 108 Modern Mechanix and

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Novel Kitchen “Desk Has PHONE Niche Finished in glistening aluminum bronze, jet black, and white enamel, this prac- tical corner desk and phone stand will add a modernistic touch to your kitchen. NY housewife will be proud to have this combination kitchen desk and tele- phone stand in her kitchen. With cook- books, recipe cards, napkins; wax paper, pencils and pens all in their proper places in the desk, a great deal of the fuss and bother of cooking will be forgotten. The charm of this desk lies in the finish rather than in the woods used, making the cost surprisingly low. White pine lumber will do for the greater por- tion of the construction. Use wood screws when as- sembling the desk. Counter- sink each screw hole and neatly fill in afterwards with plastic wood or putty. - Apply at least two coats of glossy white enamel to the desk, sanding before and be- tween coats. The insides of the pigeon compartments, the phone niche, and the top compartment are given two coats of jet black enamel. While the desk is ready to use when finished as above, somé may wish to decorate further. Sand all edges of the desk carefully with fine sandpaper after the second COMPARTMENT PAINT INSIDE OF PIGEON DARK white enamel over those edges on which you wish to have a brilliant metallic silver finish. Wait until this coat is almost dry, or just barely past the “tacky” stage. Now take a pad made of cotton flannel and dust and rub into the sticky enamel a coating of Fine Lining Aluminum Bronze, a finer grade of ordinary aluminum bronze. You will be surprised and pleased at the splen- did results. PARTITION 3/8 THICK FOR PIGEON COMPARTMENT. NICHE FOR PHONE PAINT INSIDE DARK USE WOOD DOWELS BEFORE GLUING coat of enamel, then care- fully put on a third coat of Plywood and 375” soft wood are used for the drawer bottoms, pigeon hole compartments, -and door rack as indi- cated— 7⁄4” white pine is only other lumber which is needed. X \\ | Fooor Hi |i A A 3 we N RACK ON INSIDE: OOR CONSTRUCTIVE VIEW OF DESK SUDING TRAY OF 3/8" MATERIAL RABBEr ALL CORNERS IN ALL_DRAWERS ex 20 CLEATS FOR THE SLIDING TRAY L OF DETAI X DRAWER "A" Carefully join boards making up sides and top of desk, to make them appear as one piece of lumber. Use wood dowcls before gluing boards toge:her. Plane and sand to a smooth finish after glue has dried. Use best boards for desk top. Inventions for December 109

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SOUND EFFECT Gadgets

TT DAVID A. BROWN (D Bizarre though they may seem, the devices described in this article with a little practice can be made to pro- duce any off-stage sound effect for amateur theatricals.

Pictured below are devices used for producing back-stage thun- der, chimes or fire bells, click- ing of train wheels passing over rails, or sound of marching men.

E HIS equipment which to the layman “ may appear to be the invention of a fr Av E rK -pulley over an empty barrel across which WS Le is laid a sheet of galvanized iron. At the : WY “cue” release the rope. The sound is deaf- : =NBLOCK> ening. Teg FOR FOOT STOP 110 Modern Mechanix and

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“f ittle THEATER” Ain X a J A 1 J i APA Fig. 5 shows how door bell clap- per strikes two gongs as in tele- phone. Rocks placed.at top of box in Fig. 6 break glass below when latch is released by pull. To make a set of chimes, sus- pend a brass pipe in a barrel of water. Raise and lower the pipe while tapping it with a hammer. until the desired pitch is sound- ed. The water line is the point at which the pipe should be sawed. In this way several pipes may be suspended from a rack by rope, and tuned to form chimes, church, train or fire department bells. For loud ringing use a ham- mer, for softer tones a striker padded and covered with chamois. .For the sound of train wheels passing over rails use a truck, Fig. 3, mounted on steel casters, gan a revolving on a base covered with W ene? y corrugated iron roofing. The A SN N 3 truck is 2%’ square, the base 4’ CPE Sa ae vo square. Cut a hole in the center Sy of the roofing and screw a floor : “Sah flange pipe socket to the base. Into this screw a section of pipe for the truck to revolve around. Merely cut a hole in the truck to y fit the pipe and fasten a conven- p ient handle at one corner for Slee operating the truck. As a train approaches, first RA AND sound a wooden train whistle and ring the bells. Come in with 4 the steam exhaust by lightly OR STANDARD (Continued on page 132) Ree Whir and roar of stunting airplane is realistically reproduced by hold- ff BE ROM : 5 Noise of escaping.steam is made ing newspaper against electric fan. CRATE ¢ by opening compressed air valve. ` hes Bros EAO = wa at k E | Breaking berry crates provides crackling of flames for fires. Inventions for December 111

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After first tempering immersion of cold chisel, polish to bright- mess on emery buffer, then heat center portion only until specified tem- pering color appears on cutting edge. Rotate chisel slowly to insure even heat of all parts. Tools that become dis- colored when being sharpened on an emery wheel will not hold cut- ting edge until they have again been put through tempering process, Water should be used liberally when sharpening tools with a power emery grinder. LIGHT STRAW— SPRING STEEL pCO T TING: > CHISELS —— NEW FILE : WILL NOT: cur SURFACE 112 TEMPERING SHOP TOOLS VERY mechanic should know how to temper his own chisels, plane knives, drills, and other shop cutting tools. Any tool which discolors while being sharpened on an emery wheel will never hold its edge. Using either a blow torch, forge fire, or acetylene torch, heat the cutting.end of the tool, back for about one inch, to a cherry red, and plunge it into a solution of % gal- lon linseed oil, 8 ounces baking soda, and 4 ounces copper sulphate. Now buff the cutting end to brightness on an emery buffer, not a solid emery wheel. Second Heating Tempers Tool After polishing, heat the middle of the tool over a well-charred forge or with a blowtorch, turning the tool slowly. The first heating hardens the tool, while the second softens it for whatever use it is intended. This is judged by the color of the heated metal. If the tool is a cold chisel, to be used in cutting mild steel, heat until the dark blue color appears, then plunge into the tempering solution. For cutting chilled cast iron, automotive bolts, and hard steel objects, stop the heat- ing at the light blue color. If the chisel is dipped at the straw color, a cold-cut chisel which will cut spring steel is obtained. Hardening tools in water alone makes them as brittle as glass. This solution effec- tively prevents chill-cracking and crystal- lization on all but low-carbon steels. To temper long knives, immerse them lengthwise to prevent warping just when the straw color of the second heating be- gins to blend into the light blue. TEMPERING COLORS Stir heated tool about in tempering solution until steam stops rising. Above tempering colors apply to tool steel only. Drills are brought to light blue tempering color. Modern Mechanix and

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Semi-Automatic Clutch Is Easily Installed in Any Auto THOSE who have had experience in teach- ing people to drive know what a strain is placed on car parts when the foot is sud- denly lifted off the clutch pedal. This simple semi-automatic clutch mechanism, made from an old tire pump, eliminates this trouble, and even makes driving easier for the experienced motorist. Saw off the pump cylinder four inches from the base, and file out the threads from the top flange so that it will slip over the shortened cylinder. Two bolts tapped into the flange on opposite sides, hold it in place and also support a guide bracket. The pump rod is heated, then bent as indicated in the sketches. A spring taken from an old shade roller pulls the rod out when the clutch is pressed in; collars cut off from old lamp sockets hold the spring in place and serve as adjusting stops. The leather washer or piston must fit snugly or it will let the clutch out too fast. The air escaping past the washer releases the clutch at just the correct speed, since the air hose hole is plugged. The device is bolted underneath the floor ‘boards, the bend in the pump rod hooking over the clutch pedal. Drive Power Tools With 1 Motor ze MOTOR SWINGS FREE ON SHAFT Suggested arrangement of power tools for use with univer- sal motor mounting. Four-foot length of shafting is sufficient for most installations, and will not sag under motor weight. ITH this universal motor mounting, quickly constructed from piping and a few odd auto parts, only one motor is need- ed to drive the different shop power tools. The motor floats freely on its sliding shaft hanger, its weight automatically main- taining correct belt tension. Any desired length of %” steel shafting is supported on the workbench by old auto connecting rods, blocks being placed under each support to give the motor clearance above the workbench. The sliding hanger to which the motor is fastened with strap iron clamps is a 12” length of %” brass pipe fitting snugly over the shafting. Inventions for December emmu SET COLLAR HERE TO DISENGAGE AIR HOLE PLUGGED. UP FIBRE WASHER Dimensions given here for semi-automatic auto clutch are for installation on model A Ford; on other cars pump rod’ will have different bends. Photo shows clutch installed. “Bearing Down” on Breast Drill N USING a breast drill in cramped quar- ters it is often difficult to apply the neces- -sary pressure for drilling. To speed up drilling, tie a 5 foot length of wood or angle iron to the top of the drill with rope at a point about one foot from the end. The short end of the lever is tied to the work with rope, chain, or wire, and the longer end pressed down. Using lever to apply force to breast drill when working in awkward positions. Setup is ideal for metal-drilling. 113

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Dromedary, Fish on Africa Stamps TALIAN colon- ies, taking a les- son from their French neighbors, are issuing beauti- fully lithographed picture stamps. A recent set put out by the African col- ony of Eritrea prce- sents strikingly colorful pictures of a dromedary or Arabian camel, and a fishing scene along the Red Sea. Above stamps were issued re- cently by Eritrea, Italian colony on shores of Red Sea in Africa. Heat Makes Old Coins Legible ERY often the dates and inscriptions of old coins are so badly blurred that they can no longer be read. Bring a small block of iron to almost white-hot heat and place the coin upon it. As the heat penetrates through the coin the lettering will become clearly visible because of strains set up in the metal during the punching process. 11,000 Match-boxes in Collection ITH over 11,000 different specimens from every corner of the globe, the collection of match-box labels made by Hermann Bresinsky, a Berlin, Germany, engineer is considered one of the largest in the world. The arrangement of these specimens in albums is truly unique. Only labels having similar illustrations are shown on any one ‘page. There are pages devoted to sports, to mythology, to animals, radio, and to every possible subject which might be shown in pictures. Match-box designers, it seems, have a distinct aversion to using the same scene or subject more than once. Although there are many firms through- out the world which sell small collections or single labels, most hobbyists prefer to gather specimens themselves, either by pur- chasing at stores or by trading with collec- tors in other countries. The hobby finds a great host of followers among royalty and commoners alike in England and European countries. The labels are removed from the wood or cardboard cartons by soaking in_hot (Continued on page 116) Hermann Bresinsky adds new specimens to his 11,000 variety collection of match-box labels. Labels selected at ran- dom from his album pages, showing sport, animal, transportation, and bird subjects, are pictured in the background. 114

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Motorcycle F= the thrill of power that has won victory’s checkered flag for Harley-Dav- son on track and hill all year. Seldom has one make of mo- torcycle won so many out- standing victories in a single season. In races, endurance runs, and hillclimbs Harley- Davidsons have scored an amazing total of wins and clean sweeps. You may never race your Harley-Davidson, but the sur- ging power, flashing speed, and rugged durability are there to call on when you need them —and all riders know Harley- Davidson as the CHAMPION. Do you know how easy it is to ‘buy a Harley-Davidson, and how Jiétle it costs to run? Let your Dealer tell you about his easy-pay plans, and show you how readily you can afford“The Greatest Sport on Wheels.” Send the Coupon for illustrated literature.

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ADLETS FOR HOBBYISTS STAMPS ZANZIBAR! Packet queer freakish stamps from Zanzibar, Algeria, Sudan, Malay States, Victoria, Gold-coast, Nigeria, British Colonies, Souamericans. Don’t delay! Don’t wait. This whooping packet free for 5¢ postage. Gray Stampco, Dept. M.M., Toronto, Canada. FREE Packets! Earn Stamps and money selling our nickel packets. Send 3c for list and particulars. Yakima Stampco, Yakima, Washington. CANADIAN—High Quality. 50 Variety 50c; 75 variety $1. Cash with order. Porter & Buckland, Box 1703, Winnipeg, Canada. STAMPS! 100 diff. 2c; 500 diff. 35c; 1,000 diff. 90c. Tatham Stampco, D9, West Springfield, Massachusetts. 105 DIFFERENT, including Congo, Hyderabad, Guinea, etc., 3c to approval applicants. Extra—Airmail Set Free with above. H. Huonziker, Box 225, Minneapolis, Minn. FREE—Foreign coin, banknote, and large illustrated coin eatalogue—4c postage, Souvenir California gold quarter size 26c; $14 size 53c; both 65c! Round or octagon, set of each $1.30! Approvals with each order. Tatham Coinco, West Springfield—9, Mass. STAMPS Sent on approval. 50% discount. Fred Herz- berg, 197 Grantley Ave., Elmhurst, Illinois. ALBUM, 4100 Spaces; 215 Foreign - U. S.; Twenty Air- mails; 25 Japan; Tongs; Hinges. 75c, Burtis Company, Saratoga, N. Y. HIGHEST Prices Paid for your stamp accumulations. Doak, Fresno, Ohio. HEADQUARTERS —Stamp Collectors! Complete stock Penny Approvals and Lowprice Sets. Request selection. Elyria Stamp Company, 437MM, Elyria, Ohio. SPECIAL Offer: 635 all dif. guaranteed genuine stamps, including: Spain beautiful commemoratives, Tannou Touva first issue, showing the wheel of life, India, Liheria, Vic- toria, Nicaragua, Persia, Australia, Turkey 50 Piaster, Greece cpl. set, South Africa, Costa Rica, Ceylon, Abys- sinia 1894, showing “the lion of Judah,” Russia, rare Provisionals and money stamps cpl. sets, Philippines, Bosnia cpl. set, Saar Pictorials, etc. The entire lot of con- siderable catalogue value for only net $1. Frasek, Inc., Lucerne 4, Switzerland. FREE!!! Russia Ethnographic Set or Three Spain Air- mails. Postage 3c. Roberts, 901-T Fourth, Bay City, Mich. LOOK! Gorgeous packet including Uruguay (Flying Horse) airmail, Spanish air-post, triangle, and ship stamps, ohly 5c to approval applicants. Royale Stampco, South Pasadena, California. BBOGUED Be Nes OR Ge Se eee 100 DIFFERENT Stamps from hundred countries $1.00. 12 Stamps of Africa 10c. Square Deal Stamp Co., 316 Ontario Ave., Sheboygan, Wisconsin. COINS OLD Coins in your pocket may mean fortune to you. Some worth up to $2000.00. Send dime for list. Old Coin Shop, Topeka, Kansas. $5 to $500 EACH paid for Old Coins, Keep all old money. Get posted at once. Send 10 cents for Illustrated Coin Value Book 4x6, Guaranteed Buying and Selling Prices. Coin Exchange, Box 17, Le Roy, N. Y OLD MONEY Wanted. $5.00 to $2,500.00 each paid for old coins. Buying catalog 10c. Robert Cohen, Box 483, Muskogee, Okla. CALIFORNIA gold, quarter size 27c; $% size 53c; 100 different stamps and catalogue coins & stamps 10c. Norman Shultz, Salt Lake, Utah. WE BUY 1907 Indian head cents. Full information one dime (coin). New Miss Mattick Co., Box 3455, Altoona, Pennsylvania. CSS yantar a a cae ar WE Purchase All Indianhead Pennies. Pricelists 10c. Photonumismatic, 100 Forsyth, New York. A MOLONM MISTS Cs, ENY EOTS T SNe AR WILL buy any old US coins. Send list of coins you wish to sell for prices. Highest prices paid. Ed. O. Webb, Box 592, San Jose, California. Removing Paper From Used Stamps O REMOVE paper from the backs of stamps, soak them in hot water for at least fifteen minutes. The adhesive used on the stamps is dissolved in the water, and the stamps float free of their paper backing. Pick the stamps out of the water, then place them face downward on some blotting paper or newspaper sheets for drying. If additional sheets of absorbent paper are placed over the stamps and a few books used as weights, the stamps will dry per: fectly flat. Unused stamps can be removed from paper without losing too much of the gum by placing them, paper side down, upon a moistened blotter. Some stamps, especially those from Brit- ish colonies, have a very tenacious gum, and may have to be soaked for an hour or so. It is often possible to tear the paper away from stamps without soaking. By carefully peeling the paper from the back of the stamp, working inward from all the edges, there is little danger of tearing the stamp. The stamp should not be bent during this procedure. Practice a little with cheaper stamps before trying this with your prize specimens. 11,000 Match-Boxes in Collection (Continued from page 114) water. They are then carefully dried be- tween blotters or sheets of newspaper, using heavy books as paperweights to in- sure they will not curl. Most collectors mount their labels on Jloose-leaf photo album pages, using either rubber cement at the corners or regular stamp hinges. October Problems Contest Winners RICKY indeed were the three problems selected for the October contest. Many readers sliced up carrots, corks, wood, or even clay to determine that.there were eleven pieces of cheese after the four slices were made. Other problems offered more trouble, but there were many correct an- swers. i This month’s winners are: First prize of $10—Kenneth Swan, Newcastle, Indi- ana; 2nd prize of $5—-Edw. O. Perkins, San Francisco, California; four 3rd prizes of $2.50 each—Richard Gress, Dayton, Ohio; Mary Cotton, Eldred, Pennsylvania; Oliver F. Fosha, Freeport, Illinois; Al Stahl, Atlan- tic City, New Jersey. See page 46 of this issue for the an- nouncement of the big $500 Home Improve- ment Contest, 116 Thank You jor Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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ANNOUNCING AMAZING TYPEWRITER BARGAIN. PORTABLE A DAY MONEY BACK GUARANTEE @ Positively the greatest portable typewriter bargain ever offered! Now for the first time Remington, world-famous manufacturer, offers a NEW purchase plan... only 10¢ a day buys this latest model machine! Not a used or rebuilt typewriter. Not an incomplete ma- chine. A beautiful brand new regulation Remington Portable, Stand- A Gilt that Points the Way to Success For birthday, Ohristmas, wedding, anniversary or graduation., -give a Remington Portable, The one gift every member of the family will welcome, When Dad brings home work from tho office, when Brother hus reports to get out, when Sister and Mother answi correspondence ... a (ype will do every task faster, 1 Make Leisure Hours More Fun A Ttemineton Portable can be care ried anywhere and used anywhere, alch up on corresponds ence. Write a diary of many experiences, Only ‘a diary will give you a good permanent record of what you have done and what you have seen. Kou will want a ty pewrller some day. Get it now! Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers ard 4-row keyboard; standard width carriage; margin release on keyboard; back spacer; automatic ribbon reverse; every essential feature found in stand» ard typewriters! ACT...WHILE LOW PRICE HOLDS GOOD! New wago scales in our own factories, and in the factories of the companies which make our materials, point definitely to higher prices. Stocks of machines on hand make possible the present unbelievably low cash price on this machine. Everything points to higher prices. We don't believe that we can maintain the present 25% price reduction in the face of constantly rising costs in every one of our departments. So we say . . “Act fast!” 10 DAY FREE TRIAL OFFER You can try this machine for 10 days without tisking one penny of your money. Not even shipping charges. Send for complete details on this most liberal offer. Get attractive new catalogue illustrating and describing the many Remington models available on unusu- ally low terms. Clip coupon today! Buying a typewriter isn’t like buying a suit of clothes, Many Remington portables, seeing 10 years of hard service are still. in. active use. When you buy...buy a machine with every standard is the most compactand durable portable ever built..,includes all ‘features. This beautiful machine. Specifications...» The Model 5 Includes every essen- tlal feature found in standard type- writers, It hus standard 4-row key- board, Complete visibility. Standard width carriage for long envelopes, Curriage return lever of exception. al design [or easy and rapid operas TYPING COURSE ‘When you got your new Reme ington No. 5. you willget wilh it... ABSOLUTELY FREE... a 1%-poge course in typing. It teaches the Touch System, speeds up work, it is simply written and well illustrated. Instruce Even a child can under. stand this method. A Jittle study and the average- person, child or grown-up, becomes fascinated. low this course during the 1-DAY FREE R that we give you on your type writer, At the end of that time, you should be. able todush off letters faster than with pen and ink. tlons are eusy as A.B.O. ‘oll TRIAL OFFE CARRYING CASE With every Remington No. 5, a FREE carrying case sturdi- ly built of d-ply wood. Cov- ered with heavy Pont Fab. rle. Top is removes firmly attached lo base. Can be used anywhere. - - on knees, in chairs, on trains, Qt eueveuecousneesnnesrppane Remington Rand Inc., Dept. 141-12 Buffalo, N, Y. . Please tell me how I can buy a new Remington Portable typewritėr 3 for only 10¢ a day. Also enclose your new catalog. Name Address City. VEPSFOETCOEOSRSEe BORE feature, The Remington No, 5. essential standard typewriter: in one motion, leaving machine FREE TRIAL Fépresénts the height of economy ... unequalled economy in first cost... « unequalled economy in service, Tt is today the best value ever offered in typewriter history... and that statement comes from the company thathas constantly made typewriter, history, Buy now. It is areal bargain offer, tion. Margin release on the keye board, Automatia ribbon reverse, ack spacer. Twacolorribbonshile, Variable line spacer. Adjustabls margin stops. Auto set Paragraph Key (one of the most useful features found on any typewriter), Weighd Ji lbs, 130z, Furnished with Pica or Elite type. ven State.

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CHAMPIONS THAT CAN TAKE IT! BOXING:... Remember, not so many years ago, when the “champ” stopped a real haymaker (one that started right down on the canvas) ... how he was knocked, clean through the ropes, out of the ring ... and how he came back to crush the challenger. T R AC K e Hemember that popular middle- e aged marathon runner... win- ning heart-breaking races when today’s champions were cutting their eye-teeth . . . and nowadays still finishing the grueling course, taking punishment, gritting his teeth, and staying up with the young- sters. A U T Oo e Remember last Winter. Re- e member those nights, way be- low zero, when so many cars froze tight . . . well, those were the cars with anti-freeze that couldn’t take it... with anti-freeze that breaks down under the stiff punishment of modern high horse-power, and intense engine-heats . . . with uncertain anti- freeze that needs continual renewing. But the cars that rode comfortably through last Winter—nearly two million of them—were those which carried the sure protection—Eveready Prestone. Eveready Prestone is an all-Winter anti-freeze ... an anti-freeze that can take it. One shot gives your ear guaranteed protection for the entire Winter. Eveready Prestone stands up under the demands of modern high-speed engines. By actual tests, it protects against rust from 5 to 20 times longer than other anti-freezes. It protects against “Treeze-up” down to 60° below zero (if you wish) .. it will not boil off. Read the Eveready Prestone guarantee and protection chart on Page 27. Here you-will see how inexpensively your car can have Eveready Prestone protection all Winter long. TURN TO PAGE 27 118 California’s Mansion of Mystery (Continued from page 85) moved the hands and substituted a cam. Every half hour the cam releases a pendulum- like balance which permits a wire lever to contact a mercury vial. This contact starts a blower and the flutes play.” The flutes, carved of wood by Dr. Nixon, play “Waters of Minnetonka,” “O Sole Mio” and “Indian Love Call.” But the most outstanding feature of the house is Isis, queen of the Nixon mansion. This incredible mechanical woman, a source of wonder to scientists all over the world, challenges the supernatural with fan- tastic actomplishments. Resembling some dusky princess of the Nile, Isis reclines on a couch with a zither in both hands and will play 3000 melodies on the instrument with mechanical fingers holding picks. Robot Woman Sings Isis contains 1187 wheels, many jeweled movements, nine watches, several miles of fine wire, hundreds of electro-magnets, and a system of spinning discs which selects the tune she is to play. There are no recordings within her metal vitals and every note is made by an individual stroke of the picks. “It took me three years to make the blue- prints for Isis,” Dr. Nixon said, “and another three years to complete the figure.” Explanation of the mechanics involved would require an entire volume, but there is not an automaton in the world like Isis. With a thermometer and an electrical circuit that ‘goes through one arm, Isis can even throw off her veil if the temperature is too high for her comfort. The mechanism is so delicately arranged that it can be affected by vibrations from the proximity of a stout man or woman. One recent night a singer was entertaining Dr. Nixon’s friends when suddenly Isis, moved by the vibrations of the man’s voice, began to play “Where the River Shannon Flows.” Home Has Disappearing Hat Rack In the hallway of Dr. Nixon’s home is the “disappearing hat rack.” “You see, I didn’t want a row of hats to disturb the beauty of line in the panel carv- ings,” he said, “so I arranged a hat rack that folds back out of sight into the wall with a simple turn of a hinge.” This love of beauty is reflected in Dr. Nixon’s “Death Valley” room. Here, with a sand floor and rocks brought from Death Valley as a background, hangs a huge pano- ramic painting of the famous desert. The “magic flute” mechanism is in this room, and a fountain plays in the center of the floor. Scientist, student, prodigious worker Dr. Nixon may be, but his labors give him a cer- tain measure of amusement. For when I asked him why the weather-beaten front of _the house was in such startling contrast to ; its beautiful interior, he said: Why, who ever heard of a haunted house with fresh paint?” Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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CHRYSLER , Have tried the Vacu-matic V.8 Fo. Ñ and it sure is fine, Better, yj, D By, Pick-Up with a 307 Bas sav Vacurmd both Peery yt Ck ing — John C. Martin, Pa- they yoittes and n, V8 F, ord I hor, TLYMOUTH wonderfiyj perce fore F ‘am -amazed nein pickup, mye nly 9 Vacu-matic ; E &et-awa Pre up, Mito Bing only jormance. It’s giv. Burne. “> Bur tno, By Con. ng me 5 more miles Umere, Mich i MAh e per gallon. - Walter 7 Zielinski, Ih. OLDSMOBILE | I am well pleased with | Vacu-matic on our Olds- mobile. A test proved it .to give 18 miles per gal. Belore we considered 13 good. — Arthur Wil- lams, N Y ALL Enel, WELL Hayat i find order fo, PLEASED Ballon. Ihayag from £ more ody js well pleased’ WWIII Š SS USERS REPORT amazin; 73 mile : makes zing the gj Ss. It ` af NASH oe - Canada James W. fare’ it > f per “=> On my Advanced 6 FRAN A i d 174% i KLIN > Sito i MILES MORE galton Maen a AA With Vacu mat: will idle down to 3 have Increased a Juse Dop c 1 Š miles an hour and o gee from 101 Be Pl mPleceg ae A MOTORIST WE = then take gas with- gallon pmts per medee € long 2349 out a complaint. — gu S whey Thi 1936! YEAR NOX _| Showalter, Me. year OEE 875.00 a on only © belor Eures 3 a 4 > Y r R.K Regseline, Cazip PS. Omi, 4 E A Ne Radtke, Wig, 74 Al GUARA GAS SAVINGS! AT LASTI Automotive engineers have smashed down the barriers The VACU-MATIC proves itself on every car. It is guaranteed to perfected combustion! The new VACU-MATIC solves the secret to give worth-while gas savings, quicker pick-up, and more power of greater power! With almost magical action, this amazing inven- or it costs you nothing, Why get poor mileage when it is so tion instantly puts new life and pep in any motor. It adds mileage to easy to save gas with VACU-MATIC? j every gallon of gasoline . . . produces split-second pick-up, sensitive accelerator response, greater speed'and smoother running . . . un- Free Details folding a new driving thrill for you! S Learn ahoi this femiarkable evien that so greatly affects the ae entire performance of your motor. Learn why your car is costing: Entirely New Nothing Like It! you extra money to peri without VACU-MATIC, See why The self-starter—four wheel brakes—knee action—streamlining ... your VACU-MATIC equipped car will leap away from traffic - and now VACU-MATIC! The greatest motor improvement of recent without sputter or hesitation, Discover a new driving thrill and years! With it, engineers have achieved a practical means of enjoy the savings. Get the facts! Write today! AUTOMATICALLY balancing air and gasoline in correct propor- tions for ALL speeds! Functioning directly with the manifold vacu- um, VACU-MATIC actually “breathes” when needed, giving your motor correct combustion. Sharply cuts fuel wastes, saves dollars in gas costs, reduces carbon and gives your engine new pep, greater power and longer life. TUE VACU-MATIC COMPANY r 62 W. State 8t, Wanwatosa, Wis. A + d Fits Ail Cars Gentlemen: Please send me full particulars concermng ents an P y the Vacu-matle and details of your Free Ofer. This of Sleman VACU-MATIC is constructed of six parts, conrge does pot obliguie me in any way. electrically welded into one unit, correctly Tf you are inter- adjusted and sealed at the factory. Nothing Namie sssscacsseerrsoscscistesienpaoersinianrcinntenniesninerennivennises an. ie anne to regulate. Any motorist can attach VACU- check coupon. MATIC in ten minutes. Once in, its only Pee cs socnisrnnsnnsiscnasinnnnsionnntaniiciisnananswonsiaanenene axmetarsniionenene Exclusive terri- reminder is the surge of instant power and torles how being speed it gives to the motor and the savings Cysera TEE T AR AAE „L Eranted: it affords your pocketbook. O Cheek here If Interested in selling proposition, The VACU - MATIC Co. Wauwatosa, Wis. Thank You Jor Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 119

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Thousands are Amazed over Marvelous Results cow price AIR CONDITIONER KN AV ES CAPLAIR 25% of COAL BILLS 2 Gel Capacity BY ADDING MOISTURE TO THE AIR Wonderful Invention NEW PATENTED PRINCIPLE Perhaps no Invention in years has accomplished so much as CAPLAIR. Efficiency and Low Price makes it practical for quick sale and in line with a necessity for any home. The public are air condition minded, They know what it means to their health, But the startling advantage that wins public favor is it actually saves coal bills, Needed in Every Home Easily fits any radiator and once in the home every member of the family enjoys better health. Freedom from colds. Hot Dry Air cuts down our resistance, CAPLAIR gives nature_a chance to safeguard the nose and throat and ward off respiratory diseases, The scien- tific features of CAPLAIR are covered by patents and are not found in any other device of its kind. CAPLAIR is Automatic, it evaporates the proper amount of moisture according to the heat in the radiator. Simply add water. WATER EVAPORATION IS ESSENTIAL Better Health — Freedom from Colds The winter months are long months and you need heat put you need humidity with the heat or you suffer the consequences because hot dry air seeks moisture and gets it and each living object in the room is a victim. Water evaporation ig necessary. Your health demands it! Beneficial to the system! Nature provides a body tem- perature of .6° F. ben the body temperature rises it arouses the nervous system. Maintain uniform body and room temperature with humidified air. ` BIG FIELD! BIG DEMAND! No matter what you have ever BIG PAY! sold or if you never sold anything Even beginners can before. ‘his is your big chance. make Big Money. ‘There is no secret about the profits you make, even spare time pays big. The only way you can limit your profit is to limit your calla each day. CAPLAIR will sell itself if you give it the opportunity. Territory is going fast but the field is big! Every home is interested in health protection and sales come easy, the demand is enormous. If you are interested in making real money don’t delay. ACT TODAY! The CAPLAIR Maintains Humidity At Proper Health and Comfort Levels It is easy to understand why CAPLAIR is so effective to GOOD HEALTH in the home, It adds proper moisture to the air you breathe according to the heat in the room. Thus you can avoid the opening and closing of doors and wasting of heat. Respiratory diseases are common during the heating months. N: tect the health of the family. proper humidity. © BE THE FIRST IN YOUR LOCALITY MONEY BACK GUARANTEE MAIL THIS COUPON TODAY for AMAZING /0 DAY TRIAL OFFER LANDON & WARNER, Dept. K27 i 7 l 360 N. Michigan Ave., Chicago, II. RE padintor a he l Gentlemen: o0r0o0o0no0o Send me one CAPLAIR Air Conditioner, postage PREPAID. I J will try it for 10 deya under terms oi my Money-Back if not savished. | | E $4.65 enclosed. O Send C. O. D. 84.65. | o one is immune! Pro- Let CAPLAIR add the | Street | i eS. 0 | P. S.—You save moncy by ordering 2 CAPLAIRS for $9.00. —— ~~ Se ee i et os ol Enjoy Football With This Game (Continued from page 97) yard line, the dice would be thrown, and if a red 5 and a 3 appear, the number would be 53. On line 53, under “Kickoff,” it would be found that the kick traveled 45 yards. Should the ball go out of bounds (OB), the yardage gained is found under Kickoff after throwing the dice again. The “Receiver” now has a choice of two plays—Kick Return or Fair Catch. Selecting one, he throws the dice. If a Kick Return is called, the figures indicate the number of yards which the ball was run back. If the dice shows 32, RTD on the chart indicates the ball is run back through the entire de- fending team for a touchdown. F indicates a fumble, it then being first down and ten yards to go from the point where the kick was grounded. : Should a Fair Catch be called, G indicates it is good, it then being “first and ten” from the point where the kick was grounded. The first play after a good fair catch, however, must be either a line buck, end run or free kick. F indicates the catch was fumbled, the ball going to the opponents. F-R tells that the ball was fumbled but recovered, and for this game means the same as G. F-R 31 shows that the fair catch was fumbled, the ball falling to the ground, and was then recovered and run for a gain of 31 yards. (Continued on page 128) Behind Scenes on Movie Battlefields (Continued from page 71) For the mines I bury cardboard bombs, containing either dynamite or powder, in holes two feet deep, whose sides are carefully rounded out. The bombs are covered with bone charcoal which will not burn. When these fellows explode, they spread like a mushroom and the rounded sides force the power to be expended straight up. Dynamite caps provide the “plopping” of machine-gun bullets. Each is wrapped in cetton and tape, connected with wires lead- ing to the firing board and buried two inches. Occasionally airplanes join in the attack and it becomes my task to chase them through the air with shrapnel or anti-aircraft shells. For this purpose, as well as for shells burst- ing over the troops, I fire cardboard bombs from cannons placed along the sidelines and pointing down the field. The cannons are made by installing three or more five-inch steel pipes, welded shut at the lower end, in wooden blocks 16 inches square. To fire them I again have only to close switches, the altitude reached by each shell depending upon the charge and angle of elevation. Whether anti-aircraft or ground fire is called for, I fire it all from memory. Up to this time I have injured only one man. -He was a spectator who wandered too close to the explosives. A few of the 30,000 Germans, French, British, Italian, Austrian and Ameri- can troops have wound up a hard day grimy (Continued on page 128) Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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So you’re going BACK TO WORKe Tuat’s FINE! And more good news is that im- proved business conditions are sending thou- sands of other men back to work. But don’t let your enthusiasm dim the facts. Business today, and from now on, has a new devoting a small portion of your spare time to study. In years past millions of men have come to International Correspondence Schools for this training. Today, with its unusual conditions, is bringing many of these men back for additional standard of service. It is a standard of efficiency —of training—and to ignore it is inviting another long stretch of unemployment. For your own sake, man, for your family’s sake, do not flirt with this disaster! Especially foolish when you can acquire so easily the training you must have ... when you can make yourself more valuable on your job by training, to meet and solve the problems of a new day—and many thousands who have decided to face the facts and assure their own futures. Will you face the facts? Do you want to assure your future? Then this coupon is a challenge to you! Why not mark and mail it—right now? If de- sired, you can arrange to complete the course of your choice through easy monthly payments. INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” BOX 2316, 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 Telegraph Engineer O Plumbing [O Steam Fitting D Telephone Work D Heating D Ventilation DO Mechanical Engineer D Sheet Metal Worker D Mechanical Draftsman D Steam Engineer |. O Machinist [O Toolmaker D Steam Electric Engineer O Patternmaker D Civil Engineer A O Heat Treatment of Metals D Surveying and Mapping O Bridge Engineer O Refrigeration | D Electrical Engineer D Bridge and Building Foreman OR. R, Locomotives D Electric Lighting , D Gas Engines O Diesel Engines DR. R. Section Foreman, O Welding, Electric and Gas 1 Aviation Engines D RA. R. Bridge and Building O Reading Shop Blueprints O Automobile Mechanic Foreman BUSINESS TRAINING COURSES OC. P, Accountant C Service Station Saleamanship Architect O Architectural Draftsman DO Building Estimating O Wood Millworking O Contractor and Builder D Structural Draftsman Q Structural Engineer O Inventing and Patenting O Air Brakes DR. R. Signalman D Highway, Engineering O Chomistry [O Pharmacy D Coal Mining Engineer — O Navigation [O Air Conditioning D Boilermaker D Textile Overseer or Supt. O Cotton Manufacturing D Woolen Manufacturing D Agriculture Q Fruit Growing | D Poultry Farming O Radio D Marine Engineer O Business Management O Railway Mail Clerk O Office Management D Bookkeeping D First Year College D Grado School Subjects O Industrial Management D Secretarial Work D Business Correspondence O High School Subjects DO Traffic Management C Spanish O French D Lettering Show Cards O Signs Er College Preparatory E. Accountancy O Saleamanehip D Cost Accountant GStenography and Typing O Advertising D Mustrating DQ Civil Service O Mail Carrier O Cartooning - Name... Aglis osare ACEPESS ssrstveorsneeserseanraceneess PETE City... aieeaii iiin S EA L 1 TAEAE aR ier Occupation ..rurnevies PAEA ne er siii If you reside in Oanada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada Thank You for Mentioning Modern Mechanix and Inventions Jor December When Writing to Advertisers 121

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Hunters / You can learn ISN'T THIS MALLARD Jf YES, IT'S A SHAME TO THROW AWAY SUCH GORGEOUS PLUMAGE. TM GOING TO WRITE TO THE N.W B YES, RAV, IT'S THE GRAND- W EST HOBBY IN THE WORLD. COME UP ANO SEE MY DEN. HELLO, BILL— SAY, | THOSE SPECIMENS ACTUALLY Lope HUNTING AND FISHING —AND HAVE MADE y, $84 aLresoy | AND YOU TANNED THIS FOX SCARF YOURSELF? TROPHIES FOR OTHER HUNTERS. ff GREAT. I'M GOING TO START LEARNING TAXIDER- MY RIGHT NOWS CAN + TEACH YOU Great Fun and Profit. Send Coupon for marvelous Free Book, It tells All about taxidermy — how you can Make Money and have great fen and fascination mounting Birds and Antmats. Save your wild-game trophies ~ mount for othera. Also Mount common specimens, pi eona, equirrela, rabbita, even frogs, into humorous and useful groups — highly interest- ing and sell at sight. Wild-rame Not necessary. an, Women, Boys learn quickly by Mall. Marvelous business, send coupon. ¥ Torn your spare time to Cash. BIG PROFITS! gerad taxtdermy learn alse to Tan Leather, Tan Fine Furs and make them into scarfs, etc. We teach you Genuine Chrome method—never before re- vealed, 250,000 studenta endorse this old rellable school. We offer You our marvelous Free Book. Send for Your copy To- Y, Ine few weeks we can teach yona New Trade that earns Cashin depression and good times, too. Then Taxi- A dermy brings $ In- j vestigate! . out Fame, state your AGE, and the FREE Q Book is yours, Send the coupon Today. Pd Northwestern School of Taxidermy, y 4739 Elwood Bidg., Omaha, Neb. Gentlemen:— Please send me your free 48 Va page booklet explaining Taxidermy. “How To Build 20 Boats” ... at all Newsstands ... 50e 325X _ MICRO OUTFIT $3.95 For Xmas Gifts New Model 3X—all American made. Micro range 80X to 325X, swivel base; adjustable mirror; focussing wheel. All nicely boxed, leatherette cov- ered; contains specimen slides ; dropper ; tweezer; dis- secting instrument; culture tubes; magnifier, dissecting stage; sealing liquid; 6 speci- mens in vials; instruction Book, ete, 9x14x3’", Very complete. Send No. 3MW—Outfit: Micro 75X to Se Stamp 500X; largest and best; box 12s16x for 34,"'—$5.95. Catalog No. 2MX—Outfit; Micro 125X, emaller; complete; box 9x12x3’'—$2.49, LEE SALES CO., Dept. M-12, 35 West 32nd St., New York 122 Talk on 5 Meter Wave Transceiver (Continued from page 91) A small strip of bakelite mounted on a stud was found to be the simplest method of mounting the two coils. Leads are fastened underneath to two small bolts, while the in- ner coil terminals are soldered to the heads of the bolts. A midget .0001 mfd. fixed con- denser connected directly across this mount- ing aids in maintaining rigidity. The 100,000 ohm potentiometer used as a regeneration control is mounted in front of the transformer. A separate single pole single throw toggle switch is used in the fila- ment circuit, and a double pole double throw switch to change over from sending to re- ceiving. Unless the microphone used has a switch mounted directly on it, it will be necessary to remove one lead from the panel binding post when receiving. The seven plate midget tuning condenser is held off from the panel by a bakelite strip mounted on two studs. A bakelite or hard rubber shaft cxtension must be used to con- nect condenser to vernier tuning dial. Only 4-foot Antenna Needed All leads which are shown grounded in the circuit diagram are connected directly to the aluminum panel to cut down on wir- ing. A very short antenna is required for ultra short wave transmission. A four foot length of copper wire attached to the antenna bind- ing post and insulated from nearby objects will work satisfactorily. The transmitter will operate on 90 volts, the voltage required for the receiver, but far better results are to be had if three B batter- ies, giving 135 volts, are used. Filament current can be obtained from a 2 volt storage battery—in this case the 3 ohm filament resistor is omitted. If two dry cells are used the 3 ohm filament resistor must be used to cut down the voltage to 2 volts. To put the set in operation, throw the switch to receiving position, close the fila- ment switch, and turn the regeneration con- trol slowly until a loud sh-sh-sh is heard. After locating the proper spot on the dial for reception of a nearby 5-meter transmitter, the dial setting is left alone for both sending and receiving. Recent changes in amateur radio license laws permit portable operation on the ultra- short waves without usual notifications to the radio inspector. It is still necessary, however, to have an amateur radio operator’s license to legally operate this five meter transmitter. M-M TRANSCEIVER BLUEPRINTS For those readers who prefer to work from large-size shop drawings, a set of blue-line prints on this project have been prepared to sell for 50 cents postpaid. Included with the prints is a detailed list of the parts required. Copies of the booklet “How to Become a Radio Amateur” are available at 25c postpaid. Send your order to Modern Mechanix Publishing Co., 529 South 7th St., Minneapolis, Minn. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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New Scroll Saw Offers SPECIAL FEATURES of New DELTA Scroll Saw. 1. Enables you to run fine blades at full motor speed without danger of breakage; 2. Tilting table turns 90° in either direction; f 3. Adjustable blade tension; 4, Two convenient guide posi- tions for saws from front or side of machine; 5. Four speeds without moving motor; and many other novel and use- ful features. NEW BOOK for WOODWORKERS 32-page book “Practical Delta Proj- ects”—crowded with new and “out of the erdinary” things to make— with over 100 photographs, working drawings, and easy-to-understand il- lustrations, Simple, complete instruc- tions make every project easy to follow. Every woodworker should . have this book. Send 10c with coupon. 41935 Delta catalog mailed postpaid. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers Amazing Performance and Efficiency Delta engineers. an- nounceanew “DeLuxe” model of the saw-that revolutionized -scroll sawing. Careful testing and experimenting have made possible im- portant improvements and refinements that make this saw the last word in modern scroll saws, NEW 1935 i DELTA Motor-Driven Tools The new “DeLuxe” Scroll Saw is but one of the many new improvements and tools announced this year by Delta engineers. This year the Delta line of motor-driven woodworking tools is more complete than ever before. Delta standards of efficiency, quality, and convenience have been strictly maintained—and Delta prices still kept at their low levels. Good compact motor-driven tools are within the reach of all. Every woodworker will find the new 1935 Delta line of unusual interest. Send for CATALOG The 1935 catalog of Delta quality motor-driven tools is now off the press. It is crowded with photographs and information abeut tne new line of 1935 Delta tools. It shows how Delta tools are built to stand the grind of production work, and yet are so low priced as to be within the reach of wll. Send coupon so your name will be placed on the mailing list to receive the 1935 Delta catalog without delay. Enclose only 10 cents at same time for Book of Practical Delta Projects, 32 pages of new and novel things to make with over 100 blue prints, working drawings, photographs and illustrations—and complete directions. aa a ee acc A | DELTA MANUFACTURING CO., I 3775 N. Holton St., Milwaukee, Wis, Dept. M-1234 | I l I enclose 10c (stamps or coin), for which please send me one copy of “Practical Delta Projects”. i Also place me on your mailing list to receive 1935 Delta catalog of quality motor-driven woodworking J j tools. d NANG REONE O EEEE VN) eee eee PY ACTOS. E A caeeoneeannanenareets A | City f LS GOS aA A S m R E S a S S 123

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BOYS! THROW YOUR VOICE Inte atrunk, under the bed'or x anywhere. Lots of fun fooling A teacher, policeman or friends. THE VENTRILO a little instrument, fits in. the mouth out of sight, used with above for Bird Calls etc. Anyone can use it. Never fails. A 16-page course en Ven- triloquism and the Ventrilo. All for 10c Postpaid. JOHNSON SMITH & CO. Dept. 719 RACINE, WIS. BOY AMATEUR ELECTRICIAN 10c The HOW and WHY of electricity fully told_in simple language that any boy can understand. Scores of plans and instructions for making—dry batteries, dynamos, electric motors, telegraph apparatus, telephones, electric lights, electric door bells, alarms, electric engine, rheostat, mail box alarm, electro-magnets, automatic incandescent flash, electric shocking machine, wireless telegraph apparatus, in-| duction coil, arc light, current revereer,etc.,etc. Tells all about! electric wiring, atatio électricity, magnete and maguetiem, con- ductora and insulators, electrostatic induction, electroscope, electrophorus, condensers, Leyden jer dynamic electricity, the| voltaic cell, electromagnets, electrolysis, electro-plating, electro- typing. how to build a radio for a few gents, ete. 64 pages, 100 illustrations. 10c, postpaid. JOHNSON SMITH & CO., Dept. 719, RACINE, WIS. MAKE YOUROWNRADIO tre 250 Magie Tricks ‘A Àn excellent little book Enjoy the containing nearly 300 tricke| for parlor or stage Lhat any- one can do. Tricka with “cards, coina, handkerchiefs, eggs, bottles, string, etc. Also Second Bight, Shadow- graphy; ete. Profusely jil- ka Instrated. 10c posipaid. 128 CARD TRICKS and leicht of hand. Containg all the latest and best card tricko ad Derformed by celebrated magicians, with ex- posure of card tricka used by professional gamblers. Price 25c postpald. SNAPPY JOKES. A eplendid collection of rich and rare jokes, compiled by a jolly bartender for atsg parties, smokers, ete. 64 Pages. PRICE 10c posipaid. FORTUNE TELLING BY CARDS, dice, dominoes, crystal, etc. Gives meaning of every cord, how to deal and lay them out, ete. Everything explained in aimple language. Price 10c postpaid. LEARN TO HYPNOTIZE. Book telle how to hypnotize, how to produce sleep, how to awaken a subject, medical hypnotism, hypno- tism in diseases, how to hypnotize animals, ete. Prica 10c posi STAR a t games, mar- ket reports, ed latent news, etc. This CINNT RADIO SETS” showa how to make Nna operate inexpensive Radio Bets, the ma- terial for which can be purohased for a mere trifle, Also tells how to build a short-wave Receiver for bringing in foreign stationa, police ealla, ships at sea, eto. ONLY 15c p-pd. L, pee Daisy Water Pistoi 6-Shot Water Pistol—very latest design; looka just like a Police revolver. Blue steel finish. | feet. When diluted ammonia is used is very effective against vicious dogs, tramps, animala. 7 inches long. Very simple to load and dis- PRICE 25c POSTPAID. STAGE Withabuneh MONEY Ts ts easy for TOY MAKER Greatest boys’ book written. Tells how to make e Pinhole Camera,a Canoe, model Railroad, a T phone, Boomerang, Tele- graph Instrument, Box 1t is easy for each person of limited means to appear rosperous By flashing Microscope. lectric Water Wheel. Paddle Raft, a pair of Skis a Dog Sled, Bird House, Rabbit Yard, et. 64 pages. 150 illustrations. PRICE ‘10 MIDGET BIBLE. Size of a postage atamp.| Over 200 pages. Remarkable curiosity, Said to bring good luck. Price 15c postpaid. DREAM BOOK AND FORTUNE TELLER. Tell your own fortune. With dictionary of ‘ele-\f ite. Talking Machine (Wg Motor, Electric Door Bell, |À BLANK CARTRIDGE PISTOL REVOLVER STYLE Three new models now out, 250, SOc and $1.00. Weill meade and effective. Modeled on pat-_ tern of latest type of Revolver. Appearance slone enough to scare a burglar. ‘Takes 22 Cel. Blank Cartridgea obtainable everywhere,’ Great protection against burglars, trampa dogs. Have it lying sround without t! = danger attached to other revolvers, Fine or 4th July; Now Year's, for sis work, 5 z i SMALL SIZE 4In EDIUM SIZE 5 in. long 50c. LARGE SIZE 6 In. long $1.00. BLANK CARTRIDGES 50c per 100. HOL- STER (Cowboy type) 50c. Shipped by Ex- press only not prepaid. as CRYSTAL RADIO SET $1.00 KI $400 Uj Say what you will about f; Electrical and Battery Sets, a Fy CRYSTAL set has them all beat for simplicity and clear- ness of tone. There is abso- lutely no noise and no distor- tion—no batteries to buy—no tubes to wear out—no main- tenance expense whatsoever. Cost nothing to operate and will last indefinitely. Recep- tion is loud and clear. This Receiver is guaranteed to work equal to the moat expensive Crystal Bet you eon buy. Has a receiving radius of over 25 miles, or under favorable con- ditions up to'200 miles. Constructed of the finest materials throughout, ine ie cluding supersensitive crystal, assur- wick reaulta. PRICE of Receiver only $1.00 postpald. Or complete with Esr Phone and Aerial Kit—everything all complete—nothing moro to buy, $2.95 postpald, JOHNSON SMITH & CO., Dept. 719, RACINE, WIS. CHAMELEONS — 25c LIVE, SAFE DELIVERY GUARANTEED Watch it change its color! Get one of theae most wonderful of all creatures. Watch it change ita color. Study its habits. Wear one on the lapel of your coat as a curiosity. Watch it shoot out ita tongue as it catches fies and in- gecta for food. No trouble to keep. Can go for months without food. Measures about 4 inches in length. Shipped to any address in U, S A. by mail. We guarantee safo arrival and live delivery. PRICE 25 CENTS POSTPAID. LCE 29 CEN EOE oh MIT a aE = z 826 Jokes and Riddles, 25 pia - Magic Tricks, 10 Parlor Games, 73 Toasts, ‘13 Fairy Tales, 105 Money- making Secrets, 22 Mono- Jogues, 21 Puzzles.. and Problems, 5 Comic Reci- tations, 10 Funny Read- ings, 11 Parlor Pastimes, nd their Meanings, 10 Picture Puzzles, 69 Amusing Rhymes, 37 Amusing Experiments, Deaf and Dumb] Alphabet, Shadowgraphy, Gypsy Fortune Teller, How to Tell Fortunes with Cards, Dice, Dominaes, Crystal, Coflee Cup, etc. Hypnotism, Ventriloquism, Cut-outs for Checkers and Chess, Dominoes, Fox and Geese, 9 Men Morris, a dreams and interpretations, lucky numbers, oracles, divinatione, palmistry, etc. Price! 10¢ postps HOW TO TIE KNOTS. 32 page book tells how to make different knots, hilches, aplices, ete. 100 illustrations. Price 10c postpald. 5-MINUTE HARMONICA COURSE. A new easy self-tenching method. Teaches how to play, to use the tongue, tremolo, fully illustrated. Price 15c posipald. X-RAY. TUBE A wonderful little instrument pro- ducing optica) g $ proper tlme and peellog off a genuine Dill or two from the outside of the rol), the effect created will F` found to be all that can be desired. Prices: 15 Bills 10c, 40 Bitis 20c, 120for 50c or 53.50 per thousand postpaid. illusions both surprising and startling. With it Very striking, quaint and mmcommon. Silver finish; skull and cressbones design, twa brile flashing gema sparkle out of the eyes. to bring good luck. Only 25c ppd. you can see whet is apparantly the bones of your fingers, the land in æ lead pencil, the in- terior opening in a pipe stem, and many other similar illusions. Price, 106, 3 for 250,p.pd. JOHNSON SMITH & CO. Dept. 719 RACINE, WIS. A copy of our NEW CATALOG malted on recelpt of 10c.,or the De Luxe Editlo lih cloth binding 25c. | Sleger and better ihan ever, Only book of lis kind in existence. Contains all the latest tricks In magic. the newest no les, puzzles, games, sporting goods, rubber stamps, unusual and interesting books, curlosities in seeds and plants, etc., unprocurabla eleowhere. Remit by Coin, Money Order, Check or ed siage Stamos, for ali articles listed above. Canadian —— LATEST ` CATALOG JOHNSOM SMITH bco. RACINE WIS. Spanish Prison Puzzle, Game of Anagrams, 25 Card Tricka, Crystal Gazing, ete- ALL FOR 1 6- Shot Repeating Pistol SHOOTS 25c RUBBER BANDS BREAK OPEN TYPE Just Like Real Revolver For s toy revolver, this is a splendid imitation of the reel thing. At firat glance it might easily be taken for a regulor revolver. It is a FULL SIZE WEAPON, well made, with blue steel baked enamel finish. It fires from 6 to 8 rubber bands in rapid succession, as fast as you can pull the trigger. It breaks open in the middle just like an expensive revolver. Measures 8 inches long, with 83-inch barrel. Strongly made of 20 gauge steel. Looks exactly like a real gun and clicks like one when fired. A supply of rubber bands given with each gun. Packed in individual carton complete with directions. PRICE 25 CENTS BY MAIL POSTPAID. money, stamps and Postal Notes accepted. JOHNSON SMITH & CO., Dept. 719, Racine, Wis. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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BOY CHEMISTS DISCOVER AMAZING SCIENTIFIC SECRETS SCOPE — Imagine seeing a fly’s foot so that it looks as large as a cat’s paw— salt erystals so big they appear like lumps of ice—and. thousands of other wonders of Na- ture and science. The § powerful Gilbert Mic- roscope makes Chemis- § try more thrilling than ever. Packed with Gil- bert Micro Chemistry : Sets No. 4 and No. 7 or it can bo purchased separately. front of this marvelous Laboratory Out- į fit. Dazzling rows of chemicals mount- ed in real laboratory-style racks. tubes, mortarand pestle end other, Tascin ig metal work tr: becomes a permanent. laboratory. Complete $ with three pase ae ook: Tias Chemistry, nd Glass Blowing, 95. other Gilbert Outfits from $ arger sets contain additional bcoks on f eralogyand Hydraulic and Pneumatic Free Chemistry Book and Exciting Magazine Fill out this coupon and mail it today for free copy of Mr. Gilbert’s book “How to Become a Chemist” illustrating and de- scribing each Gilbert Chemistry Outfit. Also free copy of the thrilling new magazine “Home Chemistry.” Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers MYSTIFIES S FRIENDS WINS G GILBERT] aoe guess ina a miilion years what see, hie writes a a trange en he brushes over it oie another Gilbert Chemical —and presto——the word leaps out in a bright red color. $50was Winfleld’s reward fordeveloping this fascinating experiment, $100.00 ANNUAL AWARD and twelve awards of $10.00 each “To the boy doing what, in my opinion, is the most important chemical research in 1985, I will make a cash award of $100.00. To the twelve boys doing the most important chemical re- search I will award $10.00 each. Applicants for these awards must not be over 17 years of age, and must send me a full description of their experi- ments by June 1st, 1935.” HOW YOU CAN BECOME A MASTER of CHEMICAL MAGIC WITH A GILBERT CHEMISTRY OUTFIT OULDN’T you like to perform thrilling ex- periments such as Win- field Scott and thousands of other boys are doing? Have a chemical labora- tory of your own! Make chemicals change color— transform liquids into sparkling crystals—and explore countless other mysteries of the chemical world. You might win one of the cash awards Mr. Gilbert gives each year to the boys making the most important contribu- tion to chemical research. Ask to see the 1985 mode! Gilbert Chemistry Outfits at your local dealers. But —take a tip from other boy chemists—and make sure the name “Gilbert” is on the box. “How to Become a | Mr. A. C. Gilbert, President, The A. C. Gilbert Co. j 405 Erector Square, New Haven, Conn. | Please send—free—illustrated book Chemist” and copy of “Home Chemistry.” l . i Name serryaiss ema teed ee woe | Street since resvaroavsess I E e o EE E EE E AT E

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ATLAS 9” Metal-Working Lathe Accurate to 0.001” .. $79. A complete unit, with belts and pulleys self-contained NEW ATLAS | ready to run, with self-con- DRILL tained countershaft and all P belts. ; ; PRESSES Standard equipment in- R N noo cludes automatic reversible feed; hollow headstock spin- classes of work. ca dle; complete set of gears to Bench and Floor Models. More | cut from 4 to 72 threads per and bigger bear- | inch; thread cutting dial; ings. Special | compound rest graduated to Atlas construc- tion prevents side play in quill. Speeds up to 5200 R.P.M. Precision tools — Priced from $13.35 to $33.45. 180°; six speeds with pat- ented compound device, doing away with complicated back gears; Vee- belt drive—more pulling power. ` Forty-five parts of Zamak Metal which has twice the strength of cast iron but is much lighter, thus doing away with useless weight. Lathe bed of heavily ribbed cast iron accurately machined and ground on very latest type of ma- chine shop precision equinpment— tested before shipment to .001’ accuracy—9’’ swing—18’’ to 36” between centers. Immediate ship- ment. 10 days’ trial with money back guarantee, Full line of tools and at- tachments at lowest prices. Send for free illustrated catalog. Be sure you know about the Atlas Fully Equipped Lathe before you order. Real metal working Lathes as low as $40. Write for information. ATLAS PRESS COMPANY 1852 N. Pitcher St. Kalamazoo, Mich., U. S. A. Portable, Fast, Sturdy, Low- priced. Winter’s Greatest Thrills are yours with a MEAD ICE-YACHT. SAVE MONEY by building yours with our Complete Kit easily, quickly, and with sure success. Start NOW and have your ship ready for the season’s first ice. Pay as you build. Rush dime for illustrated circular, prices and complete list of materials, fittings, spruce, etc. MEAD GLIDERS Dept. 12-M 12 S. Market St. Chicago 126 You buy a complete unit, Build This Front-Steering Iceboat (Continued from page 101) wide at the front and 2%’ at the back. The center of the cockpit flooring is aligned with the cehter-line of the backbone, being set with the rear edge 10” ahead of the end of the backbone, and then fastened in place.. Half-inch spruce is used for the cockpit rail. The space between the crossbeam and. the plywood may be closed if desired. Now you are ready to secure runnerplank . ‘to backbone. Set the center of the runner-. plank 15” ahead of the extreme rear end of: the backbone, and fasten in place with two. 6” carriage bolts, %” thick. At each end of: the runnerplank is a hobbler, the attachment ; for the runner. For the most up to date hobblers, use four pieces of angle iron 10” long, each with two and three inch sidés. There should be just enough clearance be- tween each angle iron for the runner to pivot freely. Before permanently tightening the bolts, be sure the hobblers are absolutely parallel to the runner chocks. Angle Irons Used for Runner Blades Angle-iron affords the most inexpensive blades. Ten feet of 14” stock with one inch sides will be needed. After being cut, the front ends should be heated and bent to fit the curves of the runner chocks. Quarter inch holes should be drilled every 6” on each side of the angle for flat head screws. The rudder post is made with a %” steel rod welded into the back of 1%” channel iron. A cross-piece for steering is also weld- ed to the rudder post. The crosspiece is con- nected to a similar one welded to the bottom: of the tiller post with reversed, or crossed, %” aeroplane cables. The hole for the tiller: post is drilled 9” from the stern, or rear end. The hull is braced with stays of aeroplane cable 3/16” in diameter shackled to eyebolts through the runnerplank and to a strap iron nose bracket. The eye-splices in the stays should be secured with copper wire wrap- ping, which is smoothed over with solder. The mast may be ovalled by rounding off the corners. It is braced with three stays of. aeroplane cable looped around the mast 6 feet from the top. These loops should be se- cured by tightly wrapping copper wire for six inches. Four small single-sheaved pulleys will be needed to handle the mainsail conveniently. Run the sail rope forward overhead along the boom to a pulley affixed under the jaw, then to another on the backbone. WORK FROM BLUEPRINTS! For the convenience of those builders who pre-. | fer to work from enlarged plans, blue-line prints of the Front-Steering Iceboat have been made up to sell for $1 postpaid. Each sketch in this article has been enlarged many times on tough white paper. Send your order to Modern Mechanix Publishing Co., 529 S. 7th St., Minneapolis, Minn. Thank You for Mentioning Modern Mechanix and Inventions jor December When Writing to Advertisers

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Learn ELECTRICITY Pay for Your Training in Easy Monthly Payments After You Graduate NO RED TAPE—NO STRINGS TOMY OFFER—YOU RUNNORISK! I'LL TRAIN YOU IN MY SHOPS FOR 90 DAYS—YOU GET OVER ONE YEAR TO PAY TUI- TION AFTER GRADUATION! Make your first payment 60 days after your 12 weeks' Training period and then take over a year to pay the balance in small monthly pay- ments. Your earnings on the job as a Coyne Trained Gradu- ateshould make it easy. I’m willing to back you in this way because hundreds of my surcessful graduates bave ° STUDENTS BUSY AT WORK IN GREAT COYNE SHOPS proved to me that the fellow who wants to improve himself and his conditions is the finest credit risk in the world. Learn By Doing In 12 Weeks In the Chicago Coyne Shops Do actual work on Electrical Equipment worth many thousands of dollars to qualify yourself for a big pay job. Learn to wind armatures, be an illumination expert, do signal engineering, be a power plant or substation operator, or prepare for other big-pay electrical jobs. All under individual instruction and on the sort of work you will meet out in the field on a real job. All Actual Shop Work on Motors, Generators, etc. The remarkable “Learn By Dolng” method used in the great Coyne Shops trains you to master Electricity and its many branches in 12 weeks. Actual shop work—not a correspondence course—you don’t have to recite, Instead you do actual work in wonderful, modern daylight shops on the finest kind of Electrical equipment, under per- sonal supervision of expert instructors. That’s why Coyne Training prepares you es a real Electrical Expert in such a short time, You Don't Need Advanced Education or Previous Experience If you understand simple English you can train the Coyne way—by actual work on up-to-date generators, motors, dynamos, batterles, automotive and aviation engines, electric signs, etc. Do actual jobs you will be called on to do In the field. When you finish Coyne raining you should be able to confidently tackle any job, for you will have actually had similar work during your training, Electric Refrigeration, Air Conditioning Earn Living Expenses While You're Trainin Many of my students work part time to help pay thelr llving expenses while they are training. My employment Department will also assist you to find a spare time Job to cover a good part of yourroom and board expenses. If you need part time work write me about your problems. Employment Help for You After Graduation My Graduate Employment Service will glve you real employment help. As one of my graduates you will get assistance quickly, and every help we can give you to locate a job for which you have been tralned. In addition to employment help you get consultation service free for Ilfe. Get This FREE BOOK Your life scholarship entitles you to come Get the new ‘Coyne Opportunity Book,” giving all back to Coyne at any- time and take up any new subject added to facts about Coyne Training. Photo- graphs of Shops our course, showing students at work on modern elec- Included Without Extra Cost The fastest growing industriesin America today. Manufacturers and Distributors of Refrigeration and Air Conditioning equipment need Trained men who tric equipment under the personal super- vislon of Coyne Ex- port Instructors. Also etails of my Spare Tims Employment H. C. Lewis, Pres. 500 S. Paulina St. Dept. 94-53 Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers have Specialized in these rapidly expanding fields. ous types of compressors, condensers, tempera- ture control devices, thermostatic and expansion valves—you will do actual work on latest types of Refrigerating and Air Conditioning ma- chines. And, it won't cost you one extra cent to get this remarkable training. Iincludeit abso- lutely Free with your regular Electrical Training. Mail Coupon NOW! Founded 18 | COYNE ELECTRICAL SCHOOL! spre: Chicago, 11. ! ner. Pay After Graduation Pian Hereat Coyne you will prepare to fill a job as Installa- and Graduate Employment Serv- tion and Service man, Shop Mechanic, Tester, Assem- iee. yours without cost. Simply bler, Inspector, ete. You will learn about vari- ms mum im a m as H. C. LEWIS, President Coyne Electrical School, Dept. 94-53 500 S, Paulina St., Chicago, Ill, Send me'your big FREE Book about Coyne Tralning and give me all details_regardin your "Spare Time Employment Offer” an “Pay After Graduation Plan" of easy, monthly pay ments. NAME a CITY mee LATE 127

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‘STOPPING LEAKS WHERE THE METAL IS THIN HIS is the easiest kind of a Smooth-On repair to make and anyone can get good results. Merely mix the Smooth-On with water until it forms a putty. If the leak is at a seam, pry open a little, clean off, and force the Smooth-On in with the finger or a knife blade. At a. rusted spot, scrape off the rust, force the Smooth-On through and press it to anchor on both sides. At small holes, put the Smooth-On between washers inside and out and use a small machine screw and nut for drawing up tight. Smooth-On No. 1 forced into seam openings, between rivets, or into the holes quickly metallizes and thereafter is tight against hot or cold water, steam, smoke, oil, gasoline, gas, etc. It holds in any metal and can be used as well to stop leaks at joints and cracks in cast or wrought metal pipes, radia- |. tors, boilers, and furnaces. i also to tighten loose handles and to anchor loose bolts, screws, etc., in metal, concrete, tile and wood. By following the =A simple directions in the Smooth-On Repair Booklet, dozens of home fas and automobile repairs at a very | small fraction of what a repair man would charge, and if you keep asmall canof Smooth-On ready for emer- gencies, you also avoid annoy- FREE BOOK Get Smooth-On No, 1 in 7-02., 1-1. or 5-lb. tins at any hardware store or if necessary direct from us. vit with SMOOTH OR SMOOTH.ON MFG. CO., Dept. 69 574 Communipaw Ave., Jersey City, N. J. Please send the free Smooth-On Repair Book. -` Enjoy Football With This Game (Continued from page 120) It is now first down and ten yards to go. The point of the ball is placed on the proper line, and the downs marker set to mark off ten yards in the direction of the opponents’ goal. The player with the ball then calls his plays and throws the dice. Should the offensive player select a Line Buck or End Run, the numerals on the chart indicate yardage gained; numerals followed” by L show yardage lost; F-R is a fumble which is recovered for no gain, it then being next down; F is a fumble which gives the opponent the ball at the point where play began; and P-5 is a penalty of 5 yards. If a Lateral, Short, Medium, or Long Pass is called, C indicates it is completed for the yardage specified. Yardage is placed after the symbol N indicating an incompleted pass to show whether there is a touchdown on that play which will bring the ball out to the 20 yard line. Apply official football rules here for touchbacks or incompleted passes, and for all other plays. I indicates an intercepted pass, the ball go- ing to the opponents at the point from which it started if it is a lateral pass. The yardage indicated with I on other passes is to be taken as gain made up to the point where the pass was intercepted. The dice are then thrown again, and the yardage which the pass was returned read off under Intercept- ed Pass and Kick Returns. C-7-9 indicates- -the pass was complete, for a 7-yard gain, and the ball was then run for an additional 9-yard gain. Yardage under punts is, of course, made with loss of the ball. Where D follows the yardage, the ball has been downed by a player on the kicking side, and cannot be returned; otherwise other player calls for a Fair Catch or Kick Return. BL-5L is taken as a blocked kick, there being a loss of 5 yards and ball going to opponents. BL-6G means a gain of 6 yards before kick was blocked and downed by opponents. BLTD is a blocked kick caught in the air by the opposing team and run back for a touch- down, Try for point after touchdown is made from the two yard line. Behind Scenes on Movie Battlefields (Continued from page 120) with sweat and black with charcoal; but a little soap and water quickly removed all traces of battle. Every individual explosive is wired di- rectly to a firing board. One set of contacts, for instance, connects with a distributing block connected with mines and shells with- in a particular area. I know, for instance, that the left-hand one-third of the 200 con- tacts on my own board lead to Block No. 1, in the distant left background. As the battle progresses I remember which have been fired. Usually I fire two explosions simul- taneously, perhaps a tree on the left-and a mine on the right. Thus I “frame” the pic- ture continuously for the cameras. Thank You jor Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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CAmazing New Home Training Camp Gets Remarkable Results emanen QUICK! tremendous all-around bodily strength. Re- builds every muscle. Gives you new stamina, endurance, and never-‘alling energy. Read the 23 big features you get—more than ever be- fore offered at this price by anyone, anywhere, at any time! OOK AT ALL YOU GET | . «23 BIG FEATURES— TGhest Expander—Ten Cables, 200 lbe. resistance. Adjustable to your particular needs, A quick way to build the kind of chest you have always longed to have. 9— Adjustable Headgear—for building sturdy, powerful neck muscles. $—Foot Gear—for ankles-and calves. k 5 —New Type Hand Grips—Strengthen fi A Do you Gite wrists, forearms. á BESTE: put mew foros want a §-Contestable Stirrup—Puts new power r body like into legs,muscies of stemach and thighs. = @\ this? Read 6;,Rewnne, Machine Attachment—gives you \here how the back-building advantage of this great nl cnet sport, : can geth —Complote Wall Exerciser, Attach- 0 this kind T ments—for general body development. of body. t 8- Muscle Clock — Measures your muscle ipower. Shows what your muscle power Is jn pounds, g—Foot-Gear and Ankle Strengthener —to put new endurance into your ankles and to lift and strengthen your arches, 10-5 eclal Skip Rope—for increasing speed ` and developing van wing. —20 Famous Wrestling Holds—clearly 11 pictured and described. 12-15 Secrets of Jiu Jitsu—making you the master of any man, iegardless of his size. 13-47, Winning Boxing Positions—cleariy shown in pictures. 14-19 Feats of Strength—tricks you can easily do which will amaze everyone, 15 Tricke of Hand Balancing—some of the stunts which have astounded ycu on the stage. 1 —Vital Food Facts—acientific information told in a simple way. What to esi to create new power and vitality. 17 {Snesial Ways to Get Bulging Biceps— clear inetruction for using this apparatus to rebuild that apecific part. 18—Secrets of Chest Expansion. 19-22 Stomach Muscles and How to = AA MA COMPLETE Nothing Moro to Payl Strengthon Them- spectsl advice on this 150-PAGE ` important zone o: e body, — Ways to Put New Power Inte Your Legs 2 and Thighs—many otherwise strong cee SEX BOOK are weak here. GIVEN 21-Vhints on Increasing the Strength of Your Back—for greatcr lifting ability. 22— PRIVATE Letter To Men— pointing dangers and safeguards you should know, for your own protection. 23— Complete 150-Page Sex Book— simply : and clearly written (and illustrated) by great : > 2 Z doctor. Straight answers to questions that 4 * i have puzzled you. š Laos FS SEND NO MONEY THE GYM HOME TRAINING CO., Dept. 212, 115 East 28rd St., New York City Mail Coupon NOW! : Send me at once—in a plain, unmarked container——complete home ymnasium, including all features listed on this page. When package is delivered 1 wili deposit $3.95, plus actual delivery charges, (Cenadian $3.95, Foreign $4.95, cash wlth order.) dolipkted wtih eht pietat s il wii 19 CO! a = You don’t have to send a penny with this coupon. When this big pack- A After G duya examinailonj L am got and my $3.95 in full, age is delivered—in ils Plain Container—merely deposit the special price SPECIAL: If vou ert at once you will also receive thla 150-page sex book or $3.95 plus actual delivery charges. (This one low price includes ALL ABSOLUTELY FREE! these 23 items—no further payments.) Then if, after 5 days examination, you are conrlnced that this complete home gymnasium will not give you the kind of body you hare always longed to have, will not improve your health, increase your strength, and make you a better and more confident specimen of physical manhood—i? you are not positive ihat these clalms are true, then you have the perfect tight to send back all the material you have received and your $3.95 will be refunded in full at once. Don’t be eatisfied with anything less than the kind of hody you have always wanted! Don't “put of f’’ doing something about It—now when it is so rasy to rebuild yourself h this new way! Mail coupon—without money—atonce. THE GYM HOME TRAINING CO., Dept. 212, 115 E. 23rd St., New York City. FREE OF EXTRA CHARGE For Prompt Action Name Address City State Gi check here if you are enclosing $3.95 right WITH this conpon, Jn that case, we will pay the delivery charges and you will make this saving. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 129

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HE'LL USE LEPAGE’S “i MADE IT MYSELF” @ As he points with pride to his dog- house, his first effort in craftsmanship, he probably didn’t use glue. But he’ll try other projects where he'll want snug joints, reinforce nails and screws, fill small cracks and nail holes. Then he’ll discover that glue actually helps to make a workmanlike job. Will he bother with a glue pot, when LePage’s is so easy to use right from the can? Would you, when the difference in cost is hardly worth mentioning? You can get it rom your hardware dealer. RUSSIA CEMENT COMPANY Laboratories and Factory ° Gloucester, Mass. “AMERICAN JUNIOR” POWER TOOLS = A sensational New Deal in Power Tools— A Now EVERYONE Can Have a Completely Equipped Shop for a few dollars. Mass production, big sales- volume and improved designs permit this amazing value. Not toys, but MASSIVE GREY IRON CASTINGS AND STEEL —workahle, sturdy, unconditionally GUARANTEED to do the work intended. €’ swing, 12’'c. to c., ot LATHE R E, c., extra lengths 50c per its enters 35c extra? other accessories inclode chucks, saw-table, face-plates, ete., a complete shop In itself. 16% °? high, 634"' swing, dis DRILL PRESS pee ete Sa a eee sw neing table 35e. djustabl th ent, 33 ; BENCH SAW rE Fii pte Soe. pegen SABRE SAW 2223.21) scroll and band saw work better and DISC SANDER it tre tilting 45 degrees up or down, used for finishing, jointing, grinding, buf- €., most ueefu) all round finishing machine ing, et x SPINDLE SHAPER takes 1 ' x 5-16"" cutters, does all EACH MACHINE $2.50 COMPLETE FRE “American Homecrafters anual”. 96-nage Wustrated Instruction Book ($1) free with every purchase. Customers also receive FREEthe ‘‘AMERICAN HOMECRAFTER,” MH) our how-to-make-it periodical. a digest of the best construction stories w” and home workshop ideas In all the monthly magazines. Ask for cata- log with complete description of our full line, including 6’’ Metal Working Lathe $8.75 and other tools. Send $1 deposit on any machines, balance plus express C. O. D. In U.S. AMERICAN MACHINE & TOOL CO. 200 Broadway Dept. 2.X. 130 New York, N. Y. Finding Way When Lost in Woods (Continued from page 76) frightened out of the woods, will make his way. The hunter must, of course, find a spot from which he will not shoot toward the woods where the drivers are, but to the side, thus off-setting any possible accident. Hunting deer alone actually is the acme of sportsmanship. It calls for a degree of stealth and caution in hunting that is not duplicated elsewhere in the field. In still hunting one enters the woods alone and works them as cautiously as possible, aiming to surprise the deer. Move along with utter care, stirring no leaves and breaking no twigs. In still-hunting the paramount rule to ob- serve is to have the wind blowing toward you. Always remember that the deer has a keen sense of smell. Therefore it is wise to leave off smoking while you hunt. Walk Against Wind When Trailing Although the moose is not as plentiful as deer, it ranks near the top as a big game quarry. The rutting season of the moose occurs during the month of September, or, to be more exact, starts around the middle of the month and lasts into the first part of October. Still hunting the moose is at its best from the end of the rutting season in October to th2 close of the hunting season. If the woods are full of fallen leaves that crackle, the hunting is exceedingly difficult, a condition that is broken when rain soaks the leaves and a slight snow comes on. The hunting is conducted much on the order of still hunting the white-tailed deer, save that where a trail is located one can lay his plans to work out ahead of the moose by a short cut across the trail. To accomplish this successfully, one must keep the wind in his face, for should the animal catch the scent of the hunter the hunt is practically off. Guns for Moose and Mountain Sheep Many moose hunters use rifles that do not have sufficient smashing power. The .30-06 with a 180 grain open-point, expanding, lubaloy boat-tail bullet is one of the best rifles for moose hunting, considered by some as superior to the 7 mm. The .30-30 is too light for this shooting, with the .30-40 Krag some- what better. The hunter who is able to go out into the mountainous country of the northwest and bring back with him the majestic head of a ram is looked upon with envy by all hunters. It is an expensive sport, it is true, but the lure of colorful mountains and alpine meadows, seeking the mountain sheep around timber- line, cannot be resisted. Not only has the mountain sheep an ex- ceedingly keen eyesight, but their sense of smell is equally as fine. The need for care- ful stalking, involving much climbing and sparring for position, cannot be overempha- sized. It is generally conceded that the two best cartridges for this mountain work is the 7mm. and the .30-06, the .30-40 Krag being a good third suggestion. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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TO MeO IT iy aiii, Ne bera M Fiye Treasure AY eat me bary bat pecLal de Fl rt TPR RE Bide ay opie Ce T Inter OF thasa j, Bonny iy aap CABS o; te pitted to un, piton, or aens Solec aly T

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p s 2 now—before you miss this INA 6 « sisiye crete ie arenae keak wont vie pe ohare dyad: aralng to First Prize Winner opportunity. I will award $1,000.00 extra fg, the first prize DON PARMELEE, Address......... Sennen eeten eee reresarersvere winner just for being prompt in following my sen- y! sational plan. Therefore first prize winner gets Prize Manager, CRY oie tae sees A kutake sow oe States < aes asim Buick Sedan and $1,000.00 if pronpt, or $2,500.00 112 to 114 Eleventh St. all cash if preferred. Mail coupon today for details Dept. 235 Des Moines, ta. No ConNecTION With Any OTHER Firm OFFERING PRIZE ag : Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 131 Mark in square which you would prefer if you should become First Prize winner. ` CO BUICK AND $1,000 OR [] $2,500 CASE

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for the new 9x3’ SOUTH BEND Back Geared, Screw Cutting “Workshop” Lathe Total Price $94 Operates rom Down Payment $24 gore 11 months to pay for2c per hour 9” x 3’ “Workshop” Bench Lathe complete with re- s94 versing motor and reversing switch as shown...... The 9-inch “Workshop” Lathe is a Metal Working Lathe and will handle all general machining operations. Can also be used for wood turning and machining com- positions. Cuts screw threads, right and left-hand, 4 to 40 per inch. Hundreds of “Workshop” Lathes are now in use in machine shops, auto service shops, home shops, laboratories, electrical shops and manufacturing plants. Features include: Back-geared headstock; 6 spindle speeds; automatic power feed to carriage as fine as 350 per inch; reverse for threads and feeds; graduated com- und rest.: Price without Motor Drive. $75. Other bed engths 334’ and 4’, Easy terms. 30 day trial. Immedi- ate delivery. (An Ideal Christmas Gift). Write for new 24-page Bulletin No. 5-W describing the “Workshop” Lathe and work it does. Mailed free, postpaid, to any address. RA SOUTH BEND LATHE WORKS 525 E. Madison St. South Bend, Ind. LASTING — WORTH-WHILE —o nos. Ae GIFTS JEWELRY Let us send you one of our new f style, exquisite Diamond rings | for “her” gift. If you do not think it oneofthe handsomest Diamondrings ever shown and a tremendous bar- gain. RETURN AT OUR EXPENSE, Our 76-year old reputation is YOUR GUARANTEE OF BATISFACTION © Fe TENON, Berne OUR ce - isi i 5 ite Golds Blue White Disboad ra, B28. 81.000 Week No, 39—Solid WihiteGeld Wed- ing Ring: la- E monda $16.50 i 50ca Week ” = — 13 — Man’s Elgin | No. 407 Beautlfal bogus ff No. 3 Wrist Watch. Exceilont ellow A E S timekeepor, rood 100 i Bracelet, excellent timc- No. Wristwatch., $16.50 | Leeper... . $19.95 13° 50 Cents a Week 50 Cents a Week SEND FOR FREE CATALOG TERMS. One-tenth down; balance weekly, semi- jnonthly or months a oy. y yourconvenience x . 30 N. STATE ST., CHICAGO, ILL.» DEPT. G 285 YOUR MONEY BACH IF NOT SATISFIED 132 Sound Effects for “Little Theater” (Continued from page 111) brushing a trap drummer’s steel brush across a piece of light metal laid across an empty box, or two sand paper blocks gently rubbed together. Next start revolving the truck and increase the volume on bells and whistle. Accelerate the speed of all effects. When the train pulls into the station all sounds are up. The truck stops, the bell slows its ringing, and the steam is blown off by means of a siren whistle or better still a drum of com- pressed air which is allowed to escape. The Sound of Marching Men Marching soldiers are represented through the teeter-totter, Fig. 4, made from short lengths of 2”x4”. The operator may sit on a chair and operate this with his feet, leav- ing his hands free for other uses. The glass crash, Fig. 6, is two wooden boxes mounted one above the other on four posts, as shown. A break-away bottom in the upper box is operated by a string which draws an ordinary door bolt. A small hole is cut in the screen wire covering the space between the boxes, so that the bolt may be reset. A side of the Jower box lets down. Small brass hooks hold it in position. Rocks are dropped down onto old bottles and brok- en pieces of glass placed in the lower box when the latch string is pulled. Any “busi- ness” calling for the sound of breaking glass may be handled with this effect. For rain, drop a few handfuls of BB shot onto the tin bottomed rocking tray, Fig. 7, and then agitate them gently by rocking the tray. When dried peas are similarly agitated in a tray the bottom of which is screen wire, the sound is like surf on an ocean beach. Wind is produced by revolving a drum made of %” slats tacked to drum heads at 2” intervals over which a piece of canvas is passed. A convenient sized pipe is bent as in Fig. 8, and flattened on an anvil at the points where it passes through the small notches cut in the centers of the two drum- heads. The stand is of 2”x4”. One end of the canvas flap is tacked to the cross brace, the other is passed around the drum and held down by the weight of two light bat- tens between which it is tacked. Door Slams and Cannon Fire A plank held under the foot and elevated at one end by a rope sounds like a door slam- ming or a cannon fired at a distance when released. This followed by a short rising note on a siren whistle, broken off with a hlank cartridge fired into an empty barrel, is used when a cannon registers a direct hit. Rattan switches struck across a leather cushion or piece of insulating wool give the sound of a rifle shot, while several switches rapidly struck are used for machine gun fire. Very effective fire scenes may be created, with sound alone. An ordinary child’s wood- en cricket wheel simulates the crackling of flames, as does the breaking of berry crates. The breaking of laths followed by a door slam and a few shakes of the thunder sheet give the effect of crashing timbers and walls. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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Cheaper HEAT Without COAL New Invention Fits Any Stove or Furnace 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- stall—no damage to stove—sim- ply sits in firebox of any stove sales are tremendous. Make big T@Dge, 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 ad 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-N Clark Ave. St. Louis, Mo. EARN $60 A WEEK! Write for FREE Burner of- fer and protected territory Men and women wanted to dem- onstrate and take orders for this wonderful invention. This year's MAKE $50 TO $100 A WEEK! Many of our successful students are now making big Money. Our simple methods make it easy to learn Spare gies Ort: {Cartooning and Designing. at home, in 5 . New low tuition rate. Writ i ‘ART for Pleasure aud Pront > today. Statome. S 00k STUDIO 2012, WASHINGTON SCHOOL OF ART - 1115—15TH_ST., WASHINGTON, D. C. MAKE MONEY AT HOME Home Industries Magazine will show you how. Describes all kinds of profit- able, legitimate plans, schemes, formu- las, ideas, ete. 32 or more pages. Trial subseription 10c. HOME INDUSTRIES Box 89 Irvington, Nebr. New occupation. Pays big money at once without Investment. Introduce sensational new line 5¢ and 10c necessities to stores. Self sellers. Permanent repeat business easy. Experience unnecessary. Start free. Write PRO-CO-PAX Dent. 37-DD 1956 S. Troy CHICAGO 500 POWER MICROSCOPE New 500 X Super-Power Brownscope The QUALITY microscope satisfying the demand for ullra-high power at low cost. Magnification can be varied fram 75X to 500X to suit the particular require- ments of the Amateur Microsccpist. ALL refine- ments: Rack and pinion precision focusing with TWO adjusting wheels. Adjustable stand tilting any angle, with tightening lever. Compound ob- jective and ocular lenses. Large stage. Removable slide clips. Large adjustable removable mirror. Substantially and precisely made. Compare this new Brownscope with other microscopes on the market. Money back in five days if not thoroughly satiafied. Comes complete with prepared and plain slides, directions, slide makingand dissecting equipment. an wood carrying case. nig $4.95. (By mail, add 30¢ for postage.) BROWNSCOPE MFG. CO. Dept. 56 234 Fitth Ave. $4.95 New York Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers NOW FIX ANY MAKE OF SIX BIG AUTO BOOKS ALE SHITEED an approval; whether you want to qualify as garage owner, auto re- pair expert or merely wish to know how to keep your own car 100% efficient, look at these books—they are sent to you for. free examina- tion. This. brand new edition has been prepared by a large group of America’s greatest automotive engi- neers. Anybody who can read will understand them, for this great auto- mobile encyclopedia is a veritable gold mine of valuable facts. Take advantage of this offer now; send in the Coupon for FREE examination. You don’t pay us a penny, you don’t obligate yourself to pay anything unless you decide to keep the books. Just tell us you want to see them and the full set of 6 great vol- umes, just off the press, will be sent io you! Read them, look them over and prove to your own satisfaction that one fact alone, which you will find in them, may save you an expensive repair, or help you to a better job. Very Latest Edition Imagine books which are so new that every page is right up to date— wirlng diagrams, construction details, service problems—are all right up to the minute. Nowhere else can you get as complete and up-to-dale information. Over a million dollars of resources have enabled us to give you the most authoritative books on the subject ever published. Everybody interested in automobiles in any way will welcome these books published by the world’s largest publishers of Technical Cyclo- pedias (est. 1897) with agencies all over the world. Can You Fix It? Can you take out ‘“play’’ in differ- ential? Can you kill the “shimmy” in steering? Gan you reset TIM- ING? Can you put your finger on engine trouble without guessing or tinkering? Can you pull the starter off and fix it? Can you adjust and repair transmission, engine, rear axle, bearings? These Books Tell. How and tell you how to do any and every auto job right, the first time. 6 Big Volumes Nearly 3,000 pages, over 2,000 illustrations, wirlng diagrams, equip- ment charts, etc. De Luxe edition with gold-stamped flexible binding. Sent FREE for 10 days’ use. If not wanted return express collect. If kept, send only $2.00 after 10 days, them $3.00 a month until special advertising price, $24.80, is paid. A Year’s Consulting Membership FREE ! Privilege of consulting engineers of milllon-dollar American Techni- cal Society on any automotive problem for one year without charge. If you mail coupon immediately we will include, free, extra volume T with complete information on 1934 cars, knee action wheels, etc. END NO MONE American Technical Saclety, Dept. A9320 Drexel Ave. at 56th St., Chicago, Iinols. I would like Lo see ihe brand new 6-volume edition of your automo- bile books but without any obligation to buy. I will pay the few cents delivery charges only and will examine the books and return them at your expense in 10 days unless I ilke them, in which case I will send you $2.00 then and only $3.00 per month until the special price of only $24.80 is paid. You are to include free, consulting membership certificate In the American Technical E Society. Send latest edition and also include volume 7 Free. Aviation Motors Knee Action Wheels Rear Engine Cars Outboard Motors vy Octane Selectors Tractors Are Fully Covered Wi Oc oun Paay T employer's Nameisis alkeet EGERT OEPS ASRS, 3 Employer’s Address. ...........0eeee cree cere teers wae | | Please give us, in addition, the name and address of one business man as reference. (a m m amm mm mmm m m m m m m 133

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Goodrich U.S. ano OTHERS TIRE USERS by thousands alloverthe U.S.A. vouch for LONG, HARD SERVICE, under severest road conditions of our standard brand Tilresreconstructed by the ORIGINAL SECRET YORK PROCESS, OUR 18 YEARS in business makes it possible to offer tires at LOWEST PRICES in history with 12 month guarantee.—Don’t Delay—Order Today BALLOON TIRES Ske Rim Tires Tubes 29x4.40-21 $2.15 $0.85) 30x5.25-20 $2.95 ` 29x4.50-20 2.35 0.85f31x5.25-21 3.25 1.15 Pat? DMIJO "r> 30x4.50-21 2.40 0.85128x5.50-18 3.35 1.15 28x4.75-19 2.45 0.95929x5.50-19 3.35 1.15 29x4.75-20 2.50 0.95930x6.00-18 3.40 1.15 29x5.00-19 2.85 1.05931x6.00-19 3.40 1.15 30x5.00-20 2.85 1.05932x6.00-20 3.46 1.25 28x5.25-18 2.90 1.15933x6.00-21 3.65 1.25 29x5.25-19 2.98 1.15132x6.50-20 3.75 1.35 REGULAR, CORD TIRES © res ubes J es ubes 30x3 $2.25 30.65932x434 $3.35 1.15 30x33 2.39 0.75 § 33x44 3.45 1.15 31x4 2.95 0.85 | 34x435 3.45 1.15 32x4 2.95 0.85 | 30x5 3.65 1.35 33x4 2.95 0.85 į 33x5 3.75 1.45 34x4 3.25 0.85 5 35x5 3.95 1.55 HEAVY DUTY TRUCK TIRES res Tubes zt |] 30x5 Truck $4.25 $1.95 BA ed a BG E Er 4.28 2.00 7 be 32x6 8 ply. Truck 7.96 2.75 NÍ TUBE WITH 32x6 10 ply. Truck 8.98 2-75 Pe x6 Truc. K 9D MUCUS 34x7 Truck 10:95 3.95 36x8 Truck 12.45 4.25 S 40x8 Truck 15.95 4.95 SEND ONLY $1.00 DEPOSIT with T Au TUBES NEW each fire, ordered, (34.00 de oait on = eRrc. rue! ire. e sb) Di y bite ETE C.O.D. Deduct 5 per cent if cash ‘3 CIRCULAR = sent in full with order. ALL TUBES BRAND NEW — GUARANTEED. Tires MOLDED failing to give 12 months’ service re» laced at half price. K | ORDEA sow Berone cacti bls OFFER EXPIRES. J DEALERS WANTED ` YORKTIRE & RUBBERCO.} 9855-59 Cottage Grove Ave., Dept. 4709, Chicago SUPPRESSED KNOWLEDGE Tare $ What strange powers did the anci- &] ents possess? Where was the source of knowledge that made it possible for them to perform miracles? Were these profound tacrets burned with ancient libraries, or are thoy buried $ ; beneath crumbling Temple walls ? These wise men of the past knaw the mysteries H of life, and personal power. This wisdom is not Jost, —it is withheld from the mass. It is offered freely TO YOU if with an open mind, you wish to step out of the rut of monotonous existence and MASTER YOUR LIFE. THIS FREE BOOK Man's intolerance has at times swept his achievements from the face of the earth, yet se~ creat brotherhoods have preserved this sacred wisdom of the ages. The Rosicrucians, ono of these ancient brotherhoods, INVITE YOU to write and secure a free copy of the “Wisdom of the Sages." It will point out how you may receive age-old truths. You can learn te MAKE ` YOUR LIFE ANEW—the fulfillment of your ideals awaits you. Address: Scribe C,K.H. ROSICRUCIAN BROTHERHOOD AN JOSE (AMORC) CALIFORNIA Fine .- DEVELOPS PRINT OUTFIT DEVELOP ‘Sin PICTURES IT'S EASY, - IT'S FUN! Cost per picture ia cat to a fraction. Our materiale are just like those used by the Expertenced Photo Finishers., Complete Outfit Includes: Kodak Fixing Powder— 8 Developing Tubes—Photographic 4 Paper—Graduate Measuring lass— Stirring Rod—Dark Room Lamp—FPrinting Frame— 1:99 ` Book of Instructions, Directions so simple a child can understand. Price $1.49 postpaid. (C.O.D. 20c extra, ] Earn good Income developing pictures in spare time. Satisfaction Guaranteed. PHILMORE DIST. CO. Dept. M.M.12, 1123 Broadway, N. Y. ©. AVIATION!!! TRAINING AIR-MINDED Young Men interested in enter- ing the field of Aviation as Apprentices. Write, enclosing stamp, to— MECHANIX-UNIVERSAL AVIATION SERVICE 13291 Ardmore Dept. A Detroit, Mich. MAKE MONEY At Home! EAEN steady income each week, working at home, coloring photos and miniatures in oil. Learn famous “Kochne Method” in few weeks, Work done by this method in big demand. No experience nor art talent needed. Many become independent this way. Send for free booklet, “Make Money at Home.” NATIONAL ART SCHOOL, Inc. 3601 Michigan Avenue, Dept. 2059, Chicago, Illinois m DEVELOP and PRINT Build it Yourself 134 if you have a home workshop, here's just the magazine you need. Each issue of Popular Homecraft is cramme: Hom anta e: ; with plans for making such beautiful and use- ful things as: Book Cases, China Closets, Bird Houses, Ship Models, Rustic Furniture, Lamps, Children’s Playthings. Tea Tables, Antiques, Candle Sticks, ete. Covers wood-working, metal-working, lathe work, leather craft, toya, copper, brass and pewter work. Ex- plains use and care of tools, A real '' How- to-do-it'' magazine, Scores of large, clear drawings make every step simple as A BC. SIX MONTHS’ TRIAL $1.00 Send $1.00 today for trial 6 months’ sub- scription (3 issues), Money back if not de- lighted. POPULAR HOMECRAFT 743 N. Michigan Ave. Chicago, Ni, SNAPSHOTS YOURSELF your own or your friends. Make Money. Save Money, Make Better Pictures. Learn a fasci- nating and well-paying profession and have lots of fun doing it with the WINNER PHOTO SET, acomplete, generously equipped kit (not a toy), with tested materials and thorough yeteasily un- derstood directions. Kit contains fine dark-reom lamp, high quality enameled processing trays, glass graduate, glass stirring rod, developer pow- ders, fring powders, substantial printing frame Agfa printing papers and directions. Only $2.26 Educational Circular, J. H. WINN MFG. CO. o Dept.81 124 West 23 Street New York Winner \ PHOTO-SET postpaid. Free Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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Can Science End Disasters? (Continued from page 61) bination of them all, the speed of its spread through the most congested portion of the vessel, the passenger quarters, calls for add- ed vigilance on board every craft that steams the seas. In this instance, the fire detecting apparatus was inoperative, or lagged behind the flames themselves. The emergency lights failed ‘to work when the ship’s lighting sys- tem went dark. The great volume of smoke choked the engineers, and this, combined with flames, made the launching of boats and the debarkation of passengers almost impossible. Testimony taken at the hearings bears out a belief that the gravity of the situ- ation did not at once impress itself upon those in responsible charge. Furthermore, most, if not all, of the passengers and crew might have been saved by sending them at once forward to the bow of the Morro Castle, which remained untouched by fire. In all of the instances of fire at sea, materi- als readily combustible have made the con- flagrations possible. It would seem that the future building and reconstruction of first class passenger craft must call for the utmost in fireproof materials. ‘ Passengers Should be Drilled The Morro Castle brings to the fore the growing need for well organized, competent crews and the further need for compulsory drills of the passengers to take place at the beginning of a voyage, preferably just before the steamer leaves her port. The major disasters of the sea seem to leave behind them very little in the way of heroic memories, except here and there where men and women have risen to great heights of renunciation. But the crews of sinking and burning ships, involved in utter confusion, stand forth with less distinction. In the case of the Vestris and the Morro Castle the preponderance of crew members among the rescued makes them less than heroic. One of the points sometimes forgotten in the study of sea disasters is the important one of the size of steamers. Are Liners Too Large? Ships of sixteen and twenty thousand gross tons, those of the days of 1900, were the great craft. Then came the rivalry in speed and size and luxury. Each added hun- dred feet of length, each thousand tons more of displacement, has made the control of such craft less and less certain in the event of a major accident. Some modern liners are’ so large that if a fire ever got started or any other unexpected mishap occurred, no hu- man being could hope to control the actions of passengers and crew. And now greater craft are planned. ‘The best minds will now concentrate on advancing the safety of ships at sea both as to non-inflammable materials, fire detecting and extinguishing means, and the better de- sign, placement and handling of boats. After that a limit may also be set on the size of steamers although economies probably will force steamship lines to keep new ships to more moderate dimensions. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers Past 50 he increases pay 440%! HIS is a message of hope for men over 50 but a warning for men n = under 30. William Sieferd of Cleveland, Ohio, after thirty-two years of business experience— was doing office work for $18.70 a week. He was then past the half-century mark— with only a public school education behind him—but he was determined to win! He enrolled with LaSalle for Higher Account- ancy training. i Within one year his pay increased 80%! Within seven years he had climbed up to the position of Chief Deputy of his department—with a salary 440% greater! That—at an age when most men would have quit. But not Sieferd! He writes: “Your training gave me the confidence that I lacked and needed to tackle the problems com- ing up every day—and the satisfaction of knowing I could at any time call upon LaSalle for help and information, Without your training it would have been impossible for me ever to master the work or win my promotions. As soon as I finish my second course from you—in Business English—I expect to enroll for still more training. “I am only sorry that I did not know about LaSalle 25 years ago.” HIGHER ACCOUNTANCY— A Promising Profession for You If Sieferd had trained with us earlier, he would have saved himself many years of dismal drudgery and been richer by many, many thousands of dollars. What about yourself? Haven’t you wasted precious years that LaSalle training might have saved for you? Are you now wasting them? If you want success while you are young enough to enjoy it, better investigate now what LaSalle training in Higher Accountancy offers you. Mail the coupon and learn the facts about this profession, eften called “a short-cut to business success.” Find out how—through home-study—you can prepare yourself for $3,000—$5,000—$8,000 ‘“depression- proof” positions. LaSalle has trained more men for outstanding success in Accounting than any other institution. . Don't delay a minute—a minute may turn into years. But get the facts now, without cost or obli- gation. Reach for a pencil, fill out and mail the coupon. ammmm Find Yourself Through LaSalle!m mom mm LaSalle Extension University The school that has trained over 1,100 C, P. A’s Dept. 12493-HR Chicago [7 Please send me a copy of “Account- ancy, the Profession that Pays,” with- out obligation. O Higher Accountancy Other LaSalle Opportunities: LaSalle opens the way to success in every important phase of business. If more interested in one of the fields indicated below, check and mail now. 2 O Business Management Expert Bookkeeping O Modern Salesmanship Business donee OTraffic Management OBanking and Finance Oc, P. A. Coaching HLaw—Degree of LL.B. Business English, O Commercial Law Management OIndustrial Management (Effective Speaking Modern Foremanship OStenotypy OPersonnel Management ORailway Accounting DRailway Station Mgém’nt DPaper Salesmanship Address........ Oe eee e een eeee deeeneeneaes ce ceene 135

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Sor New BIG TRAIN BOOK American Flyer leads in size, speed, fun-features and real design. Catalog shows many new trains with the lat- est advanced features and the new ZEPHYR STREAMLINE TRAIN. Select your fun making automatic signals, stations, tunnels, bridges, etc. For 1934, transformers are included in all train sets—nothing extra to buy. American Flyer Trains were the sensa- tion at the “Century of Progress.” Dads, too, make railroading a hobby. [American Flyer Mfg. Co. SEND FREE — i 2252 S. Halsted St., Chicago, IIl. TRAIN BOOK- 1 NGI. ov pained sees ea een ae CREREMES ENEA l ] Addres p ererp iinne sT kE E Ur Ra ten eee aes l I I INVENTORS SEE PAGE 12 Play A Tune iy in 10 Minutes 4 On your Spanish Guitar, Uke, Tenor "% Banjo, Mandolin or Banjo Mand œ knowledge of musle necessary. practice. Play first by number, lhen by note. Simply attach E-Z Player to your favorite instrument — press num- bered keys and pley. FREE instruction book with numbered tunes and Sets: chords comes with every se E-Z Player. Start playing popular tunes by number right off the reel. Be the life of the party—the center of attraction—a radio star. Don’t wait. Write today for 3-Day Free Trial Offer and Spe- cial Guitar Values. A postcard will do. FERRY SPECIALTIES, INC. Dept. 2612 Evanston, Ill, SPECTROSCOPE Beyond the telescope! Below the microscope! Reveals secrets of suns and atoms. Separates the double sodium line of the sun and shows countless others, vivid spectral lines in all col- ors of gases and metals. Analyzes chemicals and ores. New fascinating invention, no toy. Postpaid $2.50. ELECTRIC FUN Do tricks with electricity. Make things spin, jump, kick, vibrate, buzz, shoot, shock, mystlfy—all by elec- tricity. Make window novelties, floating rings, spirit rappings—200 stunts in all with 110 volts A.C. Bock postpaid $1. STROBOSCOPE Complete wilh newly patented electric motor, neon lamp and book of 100 experiments to be done with the outfit. Postpaid $1.25. CUTTING & SONS, (24 D St., CAMPBELL, CALIF. Get Your Own Patents Pay only government fees. Legal blanks and book with complete instructions, postpaid $1. CUTTING & SONS, 124 D St., CAMPBELL, CALIF. {hs Your Height Increased in 14 days or money back! ‘he amaz- ing Stebbing Sys- tem soon brings 3-5 Inches increase, new ‘‘pep’’ and energy. A valuable Health Course and ‘‘Success and Popularity” Course included FREE with Sys- tem, sent ccmplete for $2.00. Send for convincing Free Book with testimonials and Guarantee in plain sealed envelope. WRITE NOW TO: STEBBING SYSTEM Dept. M. M. 9, FOREST HILLS, NEW YORK Cperator No. 38 FOLLOW THIS MAN Secret Service Operator No. 38 la on the job! Running down dangerous Counterfeit Gang. Telle tale finger prints in murdered girt!’s room, F The Confidential Report PEC Operator No. $8 made to hia chiaf. Write far 4t. $3000 a year and up YOU can become a Finger Print Expert: athome, in your spare time, at small cost, Writ: for con- fidential full report and details, Literature will NOT be sent to boys under 17 years of age, INSTITUTE OF APPLIED SCIENCE 1920 Sunnyside Ave. Dept. 23-59 Chicago, If. HAENEL “100 SHOT?” REPEATER Latest Model 1935 Haenel repeating pistol. Sturdy, massive construction, easy cocking lever, 100 shot magazine. For target. Powerful for small game. . Blue or Nickel finish. Shoots B.B. steel shot, Wt. 18 oz.F REE—500 Shots. $2.00 deposit on C. O. D. FREE Catalog—Colts, Rifles, Binoculars, ete. į Hudson Sporting Goods, M-52 Warren St., New York | Easy For Anyone. Just prepare bed. plant our g spawn, keep moist and give short simple atten- tion as OUR DIRECTIONS TELL HOW, Grow in & cellar, basement. shed or unused space, Easily. A INEXPENSIVELY done. Ralse large, SNO 4 WHITE, meaty, delicious, RE AL food value mushrooms. Begin with small bed, THEN EX- PAND—All all snace with beds in tiers. OVERNIGHT CROPS! Year around production. ASSURED MARKET. Foscinating. PROFITABLE full time, or pastime occupation. Splendid HOME BUSINESS enterprise, Send dime for complete de:ails, rite today. Interstate Mushroom Industries, NM-7357, Cottage Grove, Chicago. | 4 main positlons of this new, amazing, adjustable saw permit hundreds of varlable and Intermediate positions to meet every need. Gets into tightest places. Illustration shows positions: 1, Deep cut. 2. Slice cut. 3. Skela- ton or Flush cut. 4. Triangular posl- tion. Comes finished in highly pol- ished steel with rubber grip and 2 blades (8° and 12”). Fully patented. Every Electrician, Plumber, Auto Me- chanic, Boat Builder and Building Superin- tendent needs **Quad’’. Sent postpaid on receipt of $2. 95. AGENTS. Distributors wanted for virgin territories. QUAD SALES Co. 17 East 38th St., Dept. 30, NewYork City Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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Ford Discusses Industrial Future (Continued from page 39) ties of soy beans. These are processed under mass production technique for oils and other materials which are put to many uses in the great Ford factory system. But, in order to give to the world the bene- fits of his experiments, he is showing how anybody from the young experimenter in his workshop to the farmer who may wish to grow soy beans for profit may get in on the ground floor of the new plastic industry. Only Simple Equipment Needed One may start with nothing more than a pestle, mortar, test tube, a quart of solvent and whatever useful odds and ends he may pick up around the house. Or he may go into it on a larger, though simple and inexpen- sive scale. Mr. Ford showed how this may be done in his “industrialized barn,” exhibit- ed at the Century of Progress exposition. The first step after harvesting and drying the beans is to break them up and extract the oil. In the past this has been done by pressure, but even at best 30 per cent of the oil was left in the bean meal. The Ford method, developed to a high state of cff- ciency, involves the use of a solvent, which literally washes the oil out of the crushed beans. Mr. Ford’s chemists are conducting their extraction experiments with home made equipment set up in an old building at Green- field Village. An old Ford engine is used for power. Much of the system consists of stan- dard piping. The cost is small. Soy beans are stored in the loft. Directly under an opening in the floor of the loft is a set of rollers, into which the beans are fed by gravity. How Oil Is Extracted From Soy Beans The rollers flatten the beans into thin flakes and they then pass into the extractor. This is a water-main pipe fixed at a 10- degree angle to the floor and filled with a solvent, which is generally a high test gaso- line or naphtha. The flakes are fed in at the bottom of the pipe and carried in a tumbling, washing fashion by a screw conveyor up to the top of the pipe. As the flakes work up- ward against the solvent practically all oil is removed and mixes with the gasoline. The flakes move on up in the form of a meal, to the top of the pipe, where they leave the solvent chamber and drop into a steamer where the solvent which the meal has soaked up is vaporized and driven off by a current of steam. Meantime, the gasoline, fed in at the top of the pipe, works its way down against the meal, carrying the oil with it. At the bottom of the pipe is an upright piece called the neck. When the oil Jaden gasoline reaches the bottom of the pipe, atmospheric pressure forces it up into the neck, from which it overflows, leaving the extractor and carrying the oil with it. Distillation then turns the gasoline into vapor, which rises and passes through a cooling apparatus, which is nothing else but an old Ford radia- tor. Thus it is condensed back into gasoline and is used over and over. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers BIG NEWS FOR MODEL BUILDERS o oe the original steel construction SNAP RIVETS the greatest improvement ever made in construction toys Snap rivets just like the ones used by structural steel workers. Just what you regular fellows have been waiting for. Snap rivets to speed up model building. Real |E rivets just like the kind red-blooded steel workers use. Easy to build with because you just count the holes, and snap in the rivets. Much easier and quicker than nuts and bolts—and the rivets can be used over and over again. Look at the picture above —see how easy itis? Bet- ter still, examine the new models at your dealer’s. Don’t delay! Go to him and ask him to show you the new Meccano with snap rivets. FREE Fine illustrated catalogue New Girder GALE, Old Girder And another new fea- ture! Richly enameled girders—twice as big as the old kind—brilliantly colored in red and green. Makes models look like something when they are completed. No. 5 Our Feature Set Packed in a splendid wooden chest, with a double tray of parts and a 110-volt motor for al- ternating current. The big derrick shown above is built from this set. Price complete $5.00. Sent prepaid upon re- ceipt of price if your dealer cannot supply you. showing the new Meccano Sets and also other members of the Meccano family, including the new MICROSCOPE SETS. USE THE COUPON TODAY. THE MECCANO COMPANY OF AMERICA, 200 Fifth Avenue INC. New York, N, Y. The Meccano Company of America, Inc. Dept. M, 200 Fifth Avenue, New York, N. Y. Please send—free—beautifully illustrated catalogue.

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Buy direét. from Maker Safer, Stronger,more Mileage than Rebuilt” B/A GOODYEAR- Firestone” U.S.” GOODRICH ctc. Why gamble on retreaded, renewed, repaired, or rebuilt tires — when you can now buy brand new, sale, first line tires ar low jobber prices, You don’t need to waste another penny on wild guarantees — only BRAND NEW tires can give you real, dépendable service and MILEAGE — and now American Ace is being offered you direct by the maker. Backed by Milllon Dollar Company — manufacturing and selling fiest grade, first line, standard made tires to che public, through dealers, far over 20. years. Now a change in selling policy enables you to buy these tires — made of the Anest materials, and. built co stand heavy duty use — at these low jobber prices, ALL BRAND NEW TIRES BALLOON TIRES CORD TIRES Retalls Our Price Tube} Sire Rim. Guarantee Slee Rim Bacalls Our Price Tubs 5.30 3.20 9.25 5. 9.60 5.90 .80 10.30 13.40 Hx 14.45 = G ply 18.95 8.95 1. 33x5- 8 ply 20.25 10.75 1.3 95x5+ B ply 21.50 10.95 1.45 HEAVY DUTY TRUCKS Retalls Our Prico Tube 5 5 2 31x5.25-21 Mi] 28x5.50-18 2x9 0018 n 1 32x6- 8 ply 29 32x6-10 ply 38.30 17. 36x6-10 ply 41.65 24.00 34x7-10 ply 51.45 30, | 36x8-14 ply 78.55 46.50 3. 40x8-14 ply 85.60 51.00 4. ALL OTHER SIZES How to Order: Send $1 deposit with each ‘tire ordered. ($4 with each truck tire) Balance C. O. D. If cash is sent in fulh deduct 2% Remember — 15 months’ un- conditional guarantee against cuts, bruises. blowouts—if tire fails for any rcasom whatsoever, we allow 1/15 of purchase price. for each month short of guarantee. EXTINGUISHER SREE! $1 Fire Extinguisher, Mandy, instantaneous, for auto of home, with each pairol tiresordered. AMERICAN RUBBER CORP., Dept. MM, WARREN, OHIO 15 Months Unconditional Guarantee Certificate "TIRE Z.H,POLACHEK | naan en 234 BROADWAY J | Suita aman TRADEMARK m ESCM ADARA aa | $:iin rie REG. PATENT ATTORNEY PROE ENGWEER | Namo NS WHAT IS YOUR INVENTION? diarani isiwe : Send me a simple sketch of a model for re eee to CONFIDENTIAL ADVICE—-DO IT NOW! I.. a LEARN AT HOME Are youadult, alert, ambitious, willing to study? Investigate LAWI We guide you step by step— furnish all texts, including 14-volume Law Libra- ry. Training prepared by leading law prcfessors and given by members of bar. Degree of LL. B. conferred. Low cost, easy terms. Send NOW for Free,64-page“‘Law Training for Leadership.” LaSallo Extension University, Dept. 12493-L Chicago 138 Get lt Now! The 1935 Edition of the HANDY MAN’S HOME MANUAL How To Fix.... Leaky Faucets Balky Furnaces Broken Windows Ailing Radios and 1000 other items for the Home How To Build.... Furniture . Toys . Games . Ice- less Refrigerators . . Swimming Pools and Automobile Trailers At All Newsstands If your dealer cannot supply you write to MODERN MECHANIX PUBLISHING COMPANY 529 So. 7th Street Minneapolis, Minn. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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$500 Prizes for Home Improvements

(Continued from page 48) which there is a space filled with gravel. Several methods for waterproofing base- ment walls are in use, but there seems to be only one proper plan. That is to tar the out- side of the wall after chinking all cracks and openings with cement mortar. A drain placed along the bottom of the excavation, just be- low the basement floor level, will carry away surplus water. This tile must be non-vitrified and slope as indicated. Additional wiring should be installed and checked over carefully before applying wall board. Outlets for reading lamps, electric toasters or heaters should be provided. Corner Nooks Break Monotony These furring strips, 1 by 2 inches and of suitable length, can be simply laid on the floor and the flooring nailed to them. The strips for the walls, however, should be fast- ened with toggle bolts or cement nails driven through them and into the concrete itself. Their spacing must coincide with the joints of the surfacing material to be used. The installation of corner nooks will help to break the monotony of bare walls. Built in features are also easily possible. The sim- plest form of settee need be nothing more than a glorified:wood ‘box, built in a corner, with a cover which lifts off. An attractive, easily made type of indirect lighting fixture, ideal for the finished base- ment is shown in one of the sketches. If the tones of the finish are warm, then it is sug- gested that copper or brass be used for both the cone and the top disc. If the tone is cold, then use tin or monel metal. Both the flat disc and the upper cone surface should be polished, then coated with clear lacquer. Improving Basement Heat It is important to check the floor joists overhead for sagging. If sags or low spots occur, bring the joists up to level again by either replacing the piers or building up un- der them. Girder posts whose lower ends are wet most of the time will rot at the lower end. This cend becomes soft, unable to bear the load intended, and settling results. Be- cause of this, plaster above cracks and win- dows and doors get out of plumb. If the girder posts are not in good condition, re- place them with a concrete footing. In many cases a fireplace can be buiit around the lower end of the chimney in the basement. In other cases a false fireplace can be built up, using the gas or electric heaters provided for them. In any case a fireplace will add much to the attractiveness of your basement room. Basements can also be heat- ed by installing radiators or cutting small openings in hot air pipes leading to rooms which do not require very much heat. Pad- ding placed between the basement wall and wallboard will keep heat in and cold out.

SEE JANUARY MODERN MECHANIX AND INVENTIONS FOR NEXT CONTEST! Thank You for Mentioning Modern Mechanix and I nventions for December When Writing to Advertisers

Genu ne UnoiiwooD pelow2' Mfes. face (Refinished)

Guaranteed Model No. 5 < Yours for 10 Days N 0 y No Money Down— Think of it—over 2 million buyers paid $102.50 (cash) for this model No. 5 now offered direct-to- you at way below % original price—and on easiest terms besides. Positively the greatest bargain ever offered. Accept the special 10-day trial offerandbe convinced. ee the neat, perfect work it does—coin- pare its bright, shiny newness without risk. m Recognized as the finest, strongest typewriter built. cae Terms—only 10c a day Here is positively the chance of a lifetime to own a World-famous Standard Underwood No. 5 completely refinished at the very lowest price and easlest terms. All complete with modern improvements including standard 4-row keyboard, Learn Touch Typewriting,

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20,000-Word Book Included You need not be a scientist to use thes sim- ply operated New Gem, yet it is a scientific microscope. Only at much higher prices can you equal its illumination andsharp resolution. Made by America’s largest optical institution that supplies hospitals, doctors and colleges. Magnifies 75 to 172 diameters. Yields remark- able photo-micrographs. Walnut caseand 20,- 000-word illustrated book included. Extra ob- jective magnifies to 300 diameters, $2.50 (book II, 20,000 words, included). Ask your dealer. IE Write For Free Literature Bausch & Lomb Optical Co., 794 St. Paul St., Rochester, N. Y, DIESELS THE NEW OPEN DOOR TO $ ued) Learn Diesel Engines NOW! Don’t Wait! Diesel Power is the big, new field for greater opportunitles and bigger pay. GET OUT OF THE RUTI BE AN EXPERT DIESEL ENGI- NEER and advance with this great new Industry that Is sweeping the world. LEARN DIESELS fn our blg, nationally recommended DIESEL Schools and Shops. The orlgIinal, exclusive DIESEL Schools of the United States and Canada... established many years and always ahead In training and equipment. More engines... more successful graduates . Jobe. Send for your FREE copy of “Diesel News,” containing up-to-the-minute Information abcut the amazing epnortunities everywhere for trained DIESEL m HEMPHILL DIESEL ENGINEERING "SCHOOLS, INC, 2120 San Fernando Road, Los Angeles, Calif. P. 0. Box 101, Chicago, UI. P. 0. Box 892, Oklahoma City, Okla. 502 Westlake N., Seattle, Wash. - 1043 Pender St., Vancouver, B. C. Nation-wide Employment Service is Free to all Hemphill Graduates AMERICA'S -ORIGINAL EXCLUSIVE DIESEL TRAINING SCHOOLS 140 Book K Explains All Practical School Courses —Day and Night. Book H Explains Home-Study Combination Course. . . more Big Pay New streamlined trains ara DIESEL POWERED, Taking Micro-Photos With Camera (Continued from page 63) Care should be taken in selecting the first subject to be photographed. The beginner will naturally want results and is quite apt to fail if too difficult a subject is chosen for the initial attempt. Mount slide on stage of microscope, focus and center, getting the view you wish to cap- ture in the form of a photograph. Put light screen on microscope and mount the scope on the photomicrographic stand. Then turn your attention to the camera for a moment. It should be unloaded, with ground glass focusing screen in place, diaphragm opened as widely as. possible, focus set at infinity or 100 feet and shutter opened at time exposure. Mount camera on attachment block and the latter on stand, lens of camera almost touch- ing microscope eyepiece. In a dark room, or with cloth hood cover- ing head if working in daylight, inspect the picture that should appear on the ground glass, moving microscope adjustment until it is sharply in focus. Move slide until the picture is exactly centered as you wish it to be. Try moving the microscope lamp until you have the brightest and most uniform circle of light on the ground glass that can be secured. Close the camera shutter, remove the ground glass and load the camera. Then prop the green light filter up in front of the light. The amount of exposure must be deter- mined by experiment. Science Trapped Kidnap Suspect (Continued from page 43) typically German. So was the use of the double hyphen and the word “gute” for good. There were lots of other indications. Apart from the fact that the ladder had been made by one skilled in carpentry, Far- rar pointed out that the diagram of a box, which the kidnaper drew in giving direc- tions how he wanted the money packed, showed that the writer built things from plans and that he knew cubicle content. He knew just how large a container would be required for the $50,000 ransom money. Moreover, the holes in the symbol with which the kidnaper signed all the notes had apparently been made with a carpenter’s ile. In New York, meanwhile, a clinic of seven leading scientists—criminologists, patholo- gists, psychologists, and alienists—was set up and from their analyses the police were able to add many important details to the pic- ture of John the kidnaper. One report, that of a psychiatrist who care- fully studied the ransom notes, contributed most materially to the increasing detail. “I am led to believe,” he stated, “that the writer of these letters is a very methodical person, very probably a German or Teutonic type. He is not given to personal display. He is reticent, very careful, very cautious. There are definite signs of a peculiarity in his social approach, he is shy.” Continued on page 142) Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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PSCIENTIFIC— SIMPLE TO USE Book “Revealing Nature’s Wonders,” Free Made by world-famous lens specialists, the Wollen- sak Microscope satisfies many seientlfic needs, yet a right 12-year-old can operate it. Reveals miracles of $ Nature everywhere around you. Yields wonderful pho- tographs. Endless entertainment. No. No. 235—Magnifies 110 to 235 diameters... No. [50—Magnifies 70 to [50 diameters... No. 100—Magnifies 100 dlameters Slide Set—Makes slides at home........... At dealers, or direct from us, prepaid. (Also C. 0O. D. if preferred.) Money-back guarantee. *** BUY AMERICAN * * * SF “Revealing Nature's Wonders,”’ describes Microscopes, Telescopes, Free. WOLLENSAK OPTICAL CO. 828 Hudson Ave. Rochester, N. Y. ~ Q@RAISE RABBITS FOR US We Supply Stock and Buy What You Raise PAYING YOU HIGHEST PRICES— Established 20 Years, Big Profits in Chinchillas, New Zealand Whites, ete. Easy to start. Big rabbit book catalog and monthly market pulletin showing prices we pay our pbreederssentfor only 10c. Addresa OUTDOOR ENTERPRISE CO., Inc. NEW CITY, Rockland County, N.Y. 01010) Power American Made MICROSCOPE & SET. Substantial, rugged, precise, this fine Winn Microscope pro- H vides youwithany magnification desired between 75xand 500x. Includes every refinement essential for accurate work: Com- pound lens system, clear adjustabl . 425—Magnifles 100 to 425 diameters. ..$18.50 15.50 12.50 illustrates, Binoculars, definition, rack and pinion focnsing, e removable mirror, additional mirror mounting on movable stage, slide clips, substage color filters, clips, etc. In addition to microscope, Winnerset No. 8 includes complete ¢ Biological outfit, consisting of slides, Dissecting Tools,Stains, , Color Filters, etc. Complate price of Microscope and set, only $6.75. With substage lamp, $2.00 extra. $1.00 deposit on C.O.D. orders. Free Folder on Uses of Microscope. J. H. WINN MFG. CO., Depi. 80, 124 West 29 SI..New York Double the life of your coat and vest with correctly > matched pants. 100,000 pattern Every pair hand tailored to your measure. Our match sent FREE for your O, K. before pants are made. Fit guaranteed. Send plece of cloth or vest today. e SUPERIOR MATCH PANTS COMPANY ° 209 So. State St. Dept. 141 Chieago Cartoon Course With this New Eazy-Way System, any- body can learn cartoonlng in a few pleas- ant weeks, spare time. Jt contains hundreds of illustrations and helpful short cuts, easily understood, in- structive and entertaining. Complete Course 50c Complete course mailed postpaid for 50c Money order or well-wrapped coln. R. 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Cystex is only 3c a dose at druggists. | Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers “Experience is a great teacher— but you can learn more from books, quicker and cheaper.” And the author of that sentence might have added “AND SAVE YOUR JOB AT THE SAME TIME” if he had thought of a machine shop when he wrote it. _ A ruined piece of work these days usually means a lost job. Only good men have jobs now, and to keep them they must make themselves top-notchers. You can do a lot toward insuring your own job with the— American Machinists’ Library 6 volumes—2,000 pages—2,500 Illustrations (A combined home-study course and reference library) PUNCHES Jigs TOOL DIES. MACHINE TOOLS AND THEIR OPERATION c MACHINE RUN THER - OPERATION Cony STANLEX AND STANLEY ERE is a Library that gives you expert information on every point of your work. It fully explains and illus- trates tool and gage work, machine tool operation, jigs and fixtures, punches and dies, the working of steel, oper- ating lathes, drills, hand and automatic screw machines, planers, boring machines, milling machines and a thou- sand and one other points of information which you need every day. Solves Your Problems No matter what the problem is that puzzles you, if it is anything to do with a machine shop you will find it answered in these books. Whether you are a tool maker, a die maker, a draftsman, or handling any job there is in a machine shop, this Library contains the practical infor- mation you need. The text is written in language intended for the practi- cal man. You will recognize it as sound, practical, machine shop talk all the way through. This is THE Library which will make you feel surer of yourself and of your job. You owe it to yourself and your future to mail the coupon at the bottom of this page AT ONCE. Free Examination—Easy Monthly Terms Look over this helpful library for 10 days without obli- gation. Thousands have used this plan to satisfy them- selves. If you decide to keep the books, pay for them as you use them, in easy monthly installments. Fill in anc send the Free Examination coupon now. PP BPASwewewennnwawa weve nanenana se SFREE EXAMINATION COUPON, $ MeGRAW-HILL BOOK CO., Inc., 330 W. 42nd St., New York. g $ Send me for 10 days’ free examination the AMERICAN g¢ f MACHINISTS’ LIBRARY. If I keep it I will send you $1.50 g al the end of 10 days and $2.00 monthly until the Special Price ‘ of $17.50 has been paid. If not wanted I will return the books g postpaid. “Ss 6 p Address s í Clty and States cesses EE EEE S A anunununnnuuuanu r Positlon A Company srriricri ere ree EEA kA MMX-12-34 ‘ ~BWBBABBBABBBABBEReD nunun ununu nn nnn v 141

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Cyclopedia of Civil - Engineering 7 great volumes, 2,800 pages. 1,600 illustrations. New Revised edition by twelve of America’s greatest engineers. Includes: Surveying, bridges, railroads, steel. structures, mu- § nicipal engineering, water supply, road building, ete. Spanish Grain Flex- ible Covers Gold Stamped Loaned Free! x= To prove you can learn Civil Engineering | at your sparé time. cause no description here could do it justice, to let you see for yourself the pe and simplicity, the course. Cost and terms are within your reach. | no money—just mail the coupon, m gladly p Wi Do oun part a Year—and Up! e neers are wanted NOW, Enormous mOi onein being spent in all kinda of public works and note me la spent t until H e Engineer ATE ans. n musi Ç! ae ork, it's aa bl job end there ere not enough and, Everywhere you go, you see r] mie on—water 'and poner eystems j ki ere is et the necessary trelnoln ooks ere complete an pt can understand them. tart now on oui E examinetion plan, M: the coupon without obligation American ‘Technical. Gociety D opt. ©9320, Draxel atsath S RROW the CIVIL ENGINEER” ING ant.te, BORE for 10 daya FREE. 1 will the few cents express, but I am to for the loan of the 7 big volames = then $3 month anti! Epec al adyertalng price = 329,80 je EName.___ pald. Send latest Edi Altach letter stating age, occupa- ion, employer's name and address) USED CORRESPONDENCE COURSES AND EDUCATIONAL BOOKS OF ALL KINDS BOUGHT AND SOLD! IF YOU HAVE A USED HOME STUDY COURSE YOU WISH TO SELL FOR CASH OR IF YOU WISH TO BUY ONE ON ANY SUBJECT, WRITE FOR FREE DETAILS TO: BYRN’S EDUCATIONAL SERVICE Dept. F-3, Box 2187 Cleveland, Ohio (eee INVENTIONS WANTED! Patented or Unpatented This amazing new Book, Inventors’ Sell- ing Gulde, tells how to make money with patented or unpatented ideas. In- cludes names and addresses of hundreds of manufacturers actively in the market for ideas. Tells how inventors may pro- tect their ideas for small sums, how costly dis- appointments may be avoided, etc. Book covers Proved Methods of Selling, Finding Buyers, Royalty Contracts, Legal Pitfalls, Financing, Gyp Schemes to Avoid, Patent Office Methods, and many other vital toplcs. A complete encyclopedia for the in- ventor, written by Raymond Francis Yates, who has helped $ over 30,000 inventors. Durably bound in leather-finish fabric —mailed postpaid for only $2. (Or, C.O.D., pay the post- man $2 plus a few cents postage.) e FREE Market Analysis of Your Invention For g limited time, each copy of the Inventors’ Selling Guide con- tains a certificate entitling purchasers to Mr. Yates’ expert market analysis of their ideas—estimated sales value, selling recommenda- tions, etc. FREE LIST OF NEEDED INVENTIONS for which manufacturers will pay big money meiled on receipt of 3c postage. DONLEY PUBL, CO., Dept. M12, 509 Fifth Ave,, New York, N, Y. 142 Science Trapped Kidnap Suspect (Continued from page 140) _ All these characteristics were to be found in Hauptmann, the methodical, reticent Ger- man carpenter. Detectives, after receiving this report and others, were able to picture in their mind exactly the type of person they must seek for the crime. However, the scientist who might have become the hero of the hunt was Dr. Alexan- der O. Gettler, New York’s toxicologist. Dr. Gettler, after exhaustive tests of bills passed soon after the ransom was paid, re- ported that many of the certificates bore invisible bits of glycerine esters on their surface. On some of the bills he found an occasional bit of emery. These discoveries indicated that the man passing the money was a mechanice who ground his own tools. In September, when a great many of the bills began appearing, Dr. Gettler again 'test- ed the money for further discoveries. He made a most curious find—he reported that most of the money had a musty smell; as though it had been long buried. _.. We know now that the bills had that musty smell because Hauptmann had buried them in his garage. As the ransom money was passed into cir- culation by the unknown suspect, police stuck a colored pin into a large map of New York at the spot where a ransom bill ap- peared. As months passed the number of pins increased: and seemed to concentrate in certain areas. Police noted that many of the bills were appearing along the route of the Lexington Avenue subway and concluded the passer of the money lived near the sub- way and traveled on it. A large cluster of pins on the map showed that the money was being passed in the Bronx and the police narrowed their net around that section. Who knows, if Hauptmann had not been caught when he was, Dr. Gettler, other ex- perts and the police might have found the one clue to his identity? Sooner or later one of the ransom notes would have yielded definite evidence that would have narrowed the search down to a very limited region and to a very limited group of people. Fortunes in Needed Inventions (Continued from page 86) Our parcel post system has greatly stimu- Jated the use of paper and corrugated pack- ages. These packages are usually sealed with gummed tape automatically moistened. What is needed is a small hand machine that will moisten and apply the tape in a single operation. Wires are held in electric light plugs by means of small set screws. On the whole this is an unsatisfactory method due to the fact that the frayed ends of the wires cause short circuits and the screws eventually become loose. A better and more foolproof method of holding these wire ends should be devised. A simplified coaster brake that could be applied to children’s velocipedes would be a quick seller. It should be made to sell under fifty cents. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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| Ama ging Sensational Discovery. NISHES AUTOS PAYS $3 NI AN HOUR Kar-Nu is a new, miracle discovery—a transparent, magic-like fluid with which anyone can refinish any color automchile easily, quickly and economically without polishing, waxing, rubbing or painting. Just wipe it on with a cloth! Immediate. dullness, discoloration, shabbiness, sun fade disa pear. Instantly, aa if by magic, the old finish is reju- venated and restored to the lustre, life glow and beauty of the original factory finish. As KAR-NU dries it seals the pigment snd protects the Pea from fnrther wear. ts8 tol2 monthe, GUAR- ANTEED. Equa! in beauty to a repaint or re- finishing job which costa $25.00 to 575,00. FREE SAMPLE Enormous demand! Millions want it! W, L. Mor- gen of Mass. earned $10.61 in a single hour. Sell AR-NU to individuals, feet owners, garages, auto accessory stores, used car, deal ers, ete. No Lasts 8 to 12 Months | GUARANTEED experience necessary. Write for FREE sample to prove our claims and territory ofer. KAR-NU CO., Dept. D-4], Oakley Station, Cincinnati, Ohio Not A Wax Polish or Paint Regardless of strength or size de- fend yourself and friends against any foul attack, from bulles or by gun, knife or club. Subdue with ease persons much stronger than yourself. complete course on approved American Pollce Jiu-Jitsu by Internationally known police instruc- tor 151 Wlustrations with detailed instructions pocket size. 13 knockout blows without using fists. Send One Dollar Full Price, or will send C. O. D. S. J. JORGENSEN 708 Maritime Bullding Seattle, Washington No JOKE TO BE DEAF -Every deaf person knows that— Mr. Wey made himself hear his watch tick after being deaf for twenty-five years, withhis Arti- ficial Ear Drums. He wore them day and night. ee They stopped his head i noises, They are invisible andcomfortable,nowires or_ batteries. Write for TRUE STORY. Also s bookleton Deafness, Artificial Ear Drum THE WAY COMPANY _ 141 Jofmann Bldg. Detroit, Michigan With my new amazingly simple method of self instruction you really PLAY piano the very first day. Then rapid progress. Popularity. Admiring friends. Soon a soft dance band Job. Results assured. Sendnow for this marvelous book. Complete. No outside instruction required. Musically correct. $1.00 postpaid. Satisfaction or your money back. Mail $1.00 today to HAMILTON MUSIC METHODS 5757 N. Merrimac Ave., MM, Chicago, Ill. Pays for itself in one job! Needs no pump or pressure system— no stove— no char- coal—no separate blow torch, Burns an hour at less than ¥, cent for gasoline. AGENTS’ OFFER Write forSpecial Offertoagents. The Justrite is an ideal proposi- tion for either main line or side line — full time or spare time. JUSTRITE MFG. CO., 2047 Southport Avenue, Chicago, Jil. “IM GLAD | LEARNED DRAFTING AT | HOME BY MAIL.! PREPARED INTIME For MORE PAY tearn RAFTIN ‘FROM AN ENGINEER GET READY for Prosperity, Aviation, automobiling, electricity, machinery, building lines and other industries are now calling for draftsmen. Manynew draftsmen will soon be needed. Be ready for Big Pay. Engineer Dobe willtrain you at your home by mail until you get that good job or will prepare you for better pay on the job you have. That’s my written guaranteetoyou. All tools and drawing table sent at once if you enroll now. (Est. 1900). “Success in Draftsmanship” This book explains “My Pay-Rais- ing Plan”. It tells you how I help you find a real opportunity in any- one of many big industries. NOW is the time to prepare for that job. TODAY — is the time to write for this free book! (No obligations), ENGINEER DOBE, ‘Div. 47-39 LIBERTYVILLE, ILL, INVENTORS EmN. SEND FOR FREE BOOK memm HOW TO OBTAIN A PAT- ENT. 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 tells you fully how to obtain a patent on your idea in the quickest way. With this Free Book you will also receive a “Record of Invention” form on which you can easily record your idea. Personal and Confidential Service: Your case will be personally handled only by a Registered Patent Attorney. All communi- cations will be strictly confidential. MAIL COUPON TODAY FOR FREE PATENT f BOCK AND RECORD OF INVENTION FORM. § MILLER & MILLER REGISTERED. PATENT ATTORNEYS PATENT YOUR IDEAS FORMERLY IN EXAMINING CORPS U. S. PATENT OFFICE 1638 Woolworth Bidg., Dept. 124B, New York City MILLER BUILDING, Dept. 124B, Washington, D Please send me your Free Book, “How to Obtain a Patent,” and “Record of Invertion’’ form. NAMH 22.20.2002 222 eee nen nee tee eee l i 5 ADDRESS -daca 0 hae bee ete seat eis en Pea oi ee Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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Order Today. Atlas Tire & Rubber Co., Dept. 4523 6250-52 South Morgan Street, Chicago, Ill. `: a © re T ®© ti H lo pe oa a je To Bo BO i bt Ft mi P i, MANANNAN A oe For Boat, Auto Racer, Radio Plans Get Modern Mechanix’ 1934 How-to-Build-It HYPNOTISM Learn the Secrets of this MYSTIC POWER Hypnotismisastrange,subtlepower that gives you the key to the Inner Secrets of Mind Control, When this mighty power is released, you can over- come all obstacles; make people obey your commands; strengthen your mem- ory; develop a strong. magnetic person- ality; realize your ambitions; banish fear W and worry; increase your salary; and be- A come master of yourself, friends and ac- quaintances—either sex. These magic se- es: crets are now revealed in 265-page book— ‘The Science of Hypnotism.’’ This marvelous book explains the theory and practice of Hypnotism; gives9 stages of Hypnotism; tells howto select subjects,how to hypnotize at a glance} discusses mesmerism,magnetic healing. mental telepathy, Most complete book published. SEND NO MONEY irsi Won snp book at enca, Pay postman only $1.98. plua postage. Satisfaction guaranteed. Franklin Pub, Co., 800 N. Clark St., Dept. 1712, Chicago Make £ Weekl Giving WO A WAY RCA LICENSED RADIOS AND 10 STAR “SPECIALS” R.C.A. Licensed Home Radio Sets for American, European and South American Reception and our 10 STAR items including Chest of Silver, Man’s Wrist Watch, Electric China Coffee Set, Bridge Table and Chairs, Lady’s Wrist Watch and other valuable gifts all given away absolutely FRED with our new sensational unique PUNCH SALES CARD PLAN. This ia te opportunity of the year— make up to $150cash each week for yourself. Every home, car owner, store, office, factory, lodge, club or Individual wants these marvelors new FREE R. C. A. LICENSED RADIOS or any of the valuable 10 STAR ilems. ` WRITE TODAY FOR, OUR 3 NEW STARTING OFFERS Start at once making money with our unique sales plan. Write for full infor- mation how you can secure any or all of these plans. DELUXE MFG. CO., Dept. 125, 173 W. Madison St., Chicago, ni. AUTOMOBILE COMPASS Have you ever taken the wrong road and- traveled many miles beforo discovering your mistake? This new AIRPLANE TYPE, COMPASS constantly tells your direction of travel. Sticks to windshicld. Bose 1%’? diameter. ONLY $1.95, POSTPAID, includ- ing Compensator. SATISFACTION GUAR- ANTEED or your money refunded if returned within ten days. + Agents Wanted! CO. Box 246-A12, WARREN, OHIO HULL MFG. STATEMENT OF THE OWNERSHIP, MANAGEMENT, CIRCU- LATION, ETC., REQUIRED BY THE ACT OF CONGRESS OF AUGUST 24, (912, Of MODERN MECHANIX AND INVENTIONS, published monthly at Minneapolis, Minn., for Oct. 1, 1934, State of Minnesota FA County of Hennepin Before me, a Notary Public in and for the State and County afore- said, personally appesred W. M. Messenger, who, having been duly sworn according to law, deposes and says that he is the Business Manager of the MODERN MECHANIX AND INVENTIONS and that the following is, to the best of his Knowledge and bellef, a true state- ment of the ownership, management (and if a daily paper, the clrcula- tlon), etc., of the aforesaid publication for the date shown in the above caption, required by the Act of August 24, 1912, embodied in section 411, Postal Laws and Regulations, printed on the reverse of this form, to wit: 1. That the names and addresses of the publisher, editor, managing editor, and business manager are: Publisher, W. H. Fawcelt, Breezy Point, Minn. Editor, W. J. Kostka, Minneapolis, Minn. Managing Editor, D. E. Lurton, Minneapolis, Minn. Business Manager, W. M. Messenger, Minneapolis, Minn. 2. That the owner is: (If owned by a corporation, its name and address must be stated and also immedlately thereunder the names and addresses of stockholders owning or holding one per cent or more of total amount of stock. If not owned by a corporation, the names and addresses of the individual owners must be given. If owned by a firm, company, or other unincorporated concern, its name and address, as well as those of each individual member, must be given.) Modern Mechanix Publishing Co., Minneapotls, Minn Fawcett Publications, Inc., Minneapolis, Minn. W. H. Fawcett, Breezy Polnt, Minn. Roscoe Fawcett, Minneapolis, Minn. 8. That the known bondholders, mortgagees, and other security hold- ers owning or holding 1 per cent or more of total amount of bonds, mortgages, or other securities are: (If there are none, so stats.) one. ‘ 4. That the two paragraphs next above, giving the names of the owners, stockholders, and security holders, if any, contain not only the list of stockholders and security holders as they sppear upon the books of the company but also, in cases where the stockholder or security holder appeare upon the books of the company as trustee or in any other fiduciary relation, the name of the person or corporation for whom such trustee is acting, is given; also that the sald two paragraphs contain statements embracing affiant’s full knowledge and belief as to the circumstances and conditions under which stock- holders and security holders who do not appear upon the books of. the company as trustees, hold stock and securities in a capacity other than that of a bona fide owner; and this afflant has no reason to believe that any other person, associatlon, or corporation has any interest direct or indirect in the said stock, bonds, or other securitles than as so stated by him. W. M. MESSENGER, Business Manager. Sworn to and subscribed before me this 26th day of September, 1934. [SBAL] ESTHER V. MAUSEL, Notary Public, Hennepin County, Minn. (My commission expires May Tth, 1941.) BUILD AN AUTO TRAILER Plans in 1935 Handy Man’s Manual Send 50c to Modern Mechanix Publishing Co. 529 S, Seventh St. Minneapolis, Minn. 144 Thank You jor Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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Speed Lost in America’s Cup Races (Continued from page 55) shape but, because of difficulty in pronounc- ing the word, it became known as the “Greta arbo.” When reaching, or sailing with the wind aft of the beam, the Genoa jib, long headsail that is carried aft of the mast, was used. In running before the wind the yachts used parachute spinnakers, extending around both sides of the yachts and bulging far up in the air forward. Endeavour went a step farther. It intro- duced a huge ventilated spinnaker with six | holes that gave it the name “Annie Oakley.” The holes permitted air which was not pull- ing to escape. This sail was given the credit for one of Endeavour’s two victories in the races, ; British Lost Professional Crew With this background a brief resume of the races will show how badly Endeavour’s crew handled her canvas. In fairness to Sop- with it should be noted that he lost his pro- fessional crew just before coming to America when the men struck for higher wages. He hastily substituted a volunteer amateur crew that lacked experience on the British sloop. In the very first contest the race committee courteously delayed the start 15 minutes when Endeavour’s mainsail gear fouled. In the race she suffered further delay in dousing her headsail while setting the spinnaker. In the second race she had a torn jib at the start, later lost control of her reaching jib, and on the last leg fumbled in setting the Genoa. The third race saw the British crew taking six minutes to set the Annie Oakley and later dragging her canvas in the sea when setting the reaching jib. In the fourth the crew was slower than Rainbow’s in handling sails on tacking. Shortly after the start of the fifth race the spinnaker was tangled up for four minutes, while Rainbow’s men com- pleted the same operation in one minute. In the final race the British were slow in handling sails and again got the spinnaker tangled. Sopwith Missed Mark Twice Sopwith’s most glaring errors were evident in the fifth and sixth races when he missed the stake boats marking the turns. In the fifth he lost a minute when he aimed wrong at the mark and in the sixth, while leading, he went wide of the second mark and had to fall behind Rainbow to round it. Endeavour was believed to be the faster ship in a strong wind. This proved to be true. She won the first two races when the wind ranged from nine to 16 miles an hour. Her first defeat in the third saw the wind only at six miles. Light winds persisted in the remaining races, except the fifth when it ranged from 14 to 20 miles. Many Americans regretted the defeat of the fast British ship in the fifteenth attempt to regain the cup. They are looking forward to another challenge next spring. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers TURN SPARE HOURS INTO CASH! 340 Weekly ‘InYour OwnHome NAME ADDRESS ow No soliciting! No canvassing! We show you how to make big money decorating fast-selling Giftwares. We start you with the big $10 Artist’s Outfit shown above. We supply you with $150 worth of Gift- wares free of extra charge and show you how to dispose of them without leaving your home. We give you 29 Tested Plans for mak- ing money. One Fireside Member says, “I made $100 on furniture in L} one week.” Another writes, “My sales were $500 for 5 weeks. This is my first year.” R, M. P., of IIL, says, “I did $3,500 worth of busi- ness last year and over $12,000 this year.” D. W., New Mexico, reports, “I would not tale $1000 for my Course.” No Experience Needed You too may havea guaranteed In- come opportunity with Iireside. 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 goon money practically from the start. Quick Sales in Your Home No need to leave the house to dis- pose of everything you make. Our new automatic salesman does all the selling for you. Designed to quickly find cash buyers for all the Giftwares you can turn out. No Cost Plan Send coupon for details of new plan that pays for your Fireside Course besides putting tig cash profits in your pocket. Mail coupon now while openings for new members are silil being offered. FIRESIDE INDUSTRIES Dept. 142-W Adrian Mich. Fireside Industries _ Dept, 142-W, Adrian, Mich. Send me FREE Book on Home Decorating for a big steady income. Also detalls of plan that will pay for my Course and glve ine big profits besides. 145

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FOR INVENTORS And Mechanical Minded Men 1 moo Nm SCS at È Bt Answers to Questions on Page 20 For protection. A patent gives the inventor title for 17 years. Dr. Elihu Thompson (over 700 Patents). Dr. Miller Reese Hutch- inson (approximately 1000 pat- ents), Thomas A. Edison (1101 U. S. — 1279 Foreign). (1) Goodyear. (2) Nobel. (3) Sin- felder. (4) Roentgen. The U. S. Patent Office has said in this connection that “the prepara- tion of an application is a highly complex proceeding and generally cannot be conducted properly ex- cept by an attorney trained in this specialized practice.” A partial list of some inventions and discoveries is available by writing for my booklet. Space here is too limited. It is generally advisable to ap- proach a manufacturer only when application covering the invention is on file in U. S. Patent Office. Attorney’s fees can be paid in in- stallments. No; having a patent attorney at Washington can save expense and time. The first adding machine. Quantity production of Industry. He built the first machinery for standardizing the parts and manu- facture of government muskets in the War of 1812. [ CLARENCE A. O'BRIEN 146 Registered Patent Attorney 317-P Adams Building Washington, D. C. (Cepyright Clarence A. O’Brien) Small Ideas May Have Large © s i4 J Commercial Possibilities If.you hope to realize profits from your invention, you must protect it with a United States Government Patent, Otherwise you may find that all your time and -Jabor have been lost, because it often hap- pens that other inventors are work- ing on the same idea. If you have an idea, take steps to get a patent „at once! THE Free Book shown here was pre- pared for inventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for this book AT ONCE. It will tell you exactly how an application for a Patent is made, what infor- mation you must furnish your attorney, and what steps he must take in order to protect your interests. Remember, inventing an article is one thing—secur- ing the exclusive right to manufacture it, use it or sell it is another. Without a U. S. Patent, you cannot expect to reap the profits that your invention may make possible. Send at once for this book. After you get that, you'll know exactly what to do to protect yourself. Thank You for Mentioning Modern Mechanix and Inventions jor December When Writing to Advertisers

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PATENT YOU CAN PATENT New Ideas for Improvements in Machinery, Articles, Designs, Formulas, Ete. VERY year thousands of Pat- ents are granted. Very few, however, represent the discovery of entirely new principles. Most of them provide new methods of doing some every-day thing in a better way—changes for greater efficiency, usefulness, adaptability, or beauty in some previously Patented thing. These IMPROVEMENTS are Patentable if new, and actually represent new invention. These Im- provement Patents offer large chances for profit if commercially useful. The business world wants improved products and services. THE FIRST IMPORTANT STEP IN SECURING A PATENT ds to obtain the services of a Registered Patent Attorney, Establish the date of your invention as explained in My Book and disclose your idea to him in correct form. He then makes a SHARCH of the Patent Office Records and reports to you on existing U.S. Patents which might bear on your invention, giving his opinion on the advisability of proceeding and filing formal application. How thls inexpensive step can save you money, time and delay when Patenting your idea—how it tells you whether or not it is worth your while to flle formal Application—all is explained in My Big Book— SEND FOR IT TODAY. If you have developed some improvement, something which adds to the usefulness of any product—whether this product is NYateh hea o Ths FREE Patented or not—you should pro- tect your improvement with a Patent at once, Send for My Big Book which tells you how, Reasonable Fees— Convenient Terms Don’t worry about finances. My fees are very reason- able—tI can arrange convenient terms of payment. It is my custom to permit clients to pay for my services in installments as the application progresses in my office. See My Big Book for fees inobtaining Patent. It explains my arrangements clearly. SEND FOR IT ALSO FREE RECORD OF INVENTION BLANK This FREE Record of Invention Form enables you to make in convenient form a sketch of your idea and have it witnessed in a manner of value to you should the occasion for evidence arise. MAIL THIS COUPON TODAY and ob- tain my FREE BOOK and Record of In- vention Form, NAME ADDRESS Thank You for Mentioning Modern Mechanix and I nventions for December When Writing to Advertisers CLARENCE REGISTERED PATENT ATTORNEY __317-P ADAMS BUILDING — WASHINGTON, D.Z. Please send me your FREE BOOK, “How to Obtain Patent,” and your “Record of Invention” Form, without any cost or obligation on my part. NO. 1 Make a rough pen- cil sketch of your invention, describe it fully, and send it to me for prelimi- aary search through U. S. Patent Office a —tee $5.00. STEP NO. 2 My trained search- ers will then make a preliminary search of the pertinent U. S. Patents to deter- mine if your inven- tion is probably pat- entable. - STEP NO. 3 My complete report of search and opin- ion on patentability will be mailed to you with copies of U. S. Patents that I consider nearest to your invention. STEP NO. 4 If you decide to make patent appli- cation, for customary fees explained in my booklet, my drafts- men will make draw- ings and proper pa- pers will be pre- pared for presenta- tion of your inven- tion to the Patent A. OBRIEN a ee ee ee eee ee sy (important: Write or print name plainly) 147

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SEER. Eee a oe ee, ee Ee b n amn = ae et me = ee mea oe m å am ë as mg i i mn å un on amea ni mra Br s -= CES ECE] = I i ii ma = i) Z Da m u ——7 =. a os Vee. x ON APPROVAL j 5 VOLUMES BRAND NEW EDITION e= Only 15 minutesa day with these WONDER BOOKS will prepare you for & good drafting job in less than a year. Mechanical and architectural drafting from simple straight lines to important complex plans. A step qt a time! Built especially for beginners, for men with only grammar schooling. Draft- ing ‘room practice, PLUS ENGINEER- ING, made easy and clear. Includes com- plete course In blue-print reading. Big Field Big Demand Big Pay tent draftamien sre urgently needed rightnow m, ii l! porla lini and pagu tgetaring lines at 350. 00 ta That’ t the beginning—FOR S RAFTSNEN HAVE THE Sst CHANCES FOR ADVANCEMENT. Pleasant, fascinating wo easy to learn and do. Learn qulo! kly wilh these Books send coupon for a net FREE and see for yourself, A year's consulting membership in the: American Technical Society now given free to all readers of this famous cyclopedia of drafting. Many say that it ta worth more than tha cost of the books: Complete set of drawing instruments if you send for these drafting books NOW. These instruments are made of the finest of German silver, are absolutely accurate and are packed in velvet lined leatherette Pocket case. Real $10 valuc, but free to you with these books. AMERICAN TECHNICAL SOCIETY Dept. D-9320, Drexel at 58th St., Chicago, Ii, American Technical Society, Dept. D-9320, Drexel at ‘Seth St., ct » Chicago, Il. Send for 10 days’ tres use New 6 volume set of drafting. I will pay the few cents delivery charges. Ifl wish, ] may return books In 10 days an you nothing bat ieT ‘decide to Ea them, I will send $2.00 after 10 days, then only $3.01 month until e special introductory prica, ls pald, ‘Send latest edition and [nelad awing instruments, For Beginners Written, so you can understand every word, by 22 famous engineers and archi- tects, DeLuxe flex- ible binding, nearly 2,000 pages, 1546 blue- rints, charts and jagrams; prepares you for a good draft- ing job in mechanical or architectural lines, Sent for 10 days’ free useif you mail coupon immedi atelv, AGO G68 esate oos sci as ans a cect Sees seas A AAAA RARA RRASA Attach letter stating age, occupation, employer’s name and address and ‘hat of at least one business man as a reference. BIG PROFITS IN “NUFOND GIANTS” Breeder lays 10,000 eggs each year, Bullfrogs sell $3.00 dozen. No experience necessary. Backyard pond starts you. Raised in any cli- mate. FREE, illustrated book “A Fortune in Frogs” explains everything. Write today! AMERICAN FROG CANNING CO. “Originators of CANNED Frog Legs” Dept, 119-X ew ‘Srieans, La, 148 MARY PICKFORD tells what’s wrong with radio If you were suddeniy appointed czar of ra- dioland — what would you do tochange broad- casting methods? Mary Pickford, the new star of the air, has written her views on radio broadcasting exclu- sively for RADIO- LAND Magazine. Coughlin vs. Roosevelt The story of the break between. two national figures, revealing the radio priest’s plans for his radio campaign this winter. RADIOLAND The News Magazine of the Air Dozens of other articles on the spark- ling new programs and personalities of the new fall radio season—Rudy Vallee’s Music Notebook—Block and Sully—The Gibson Family — Lawrence Tibbett — Frances Langford—-Myrt and Marge— intimate news—gossip—portraits—ac- tion pictures. On sale at all News- stands 10c Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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LEARN TO READ BLUEPRINTS More money, bigger earnings, better jobs for you if you can read blueprints. You can learn, easily and quickly from this new course in 10 simple, understandable lessons. Many actual drawings—covering several different subjects. Twenty real blueprints. Practical. Concise. COMPLETE COURSE ONLY $2.95 POSTPAID Special introductory price for complete course only $2.95 postpaid. Order today! MECHANIC'S INSTITUTE, Box 604, Detroit, Mich. placing world’s greatest line of Counter Card Merchandise with stores.. Aspirin, Razor Blades, Dime-Lax, Bromo-Flzz, Confections, 100 fast selling displays. Over 100 per cent profit for you and merchants. Steady repeat orders. No experience or_inveatmeni needed to start. Big catalog FREE. WORLD'S PRODUCTS CO. Dept. 12814 Spencer, Ind. S-P-E-E-D! AUTO RACING BOOK Whole book brand new. Working draw- ings, pletures and full description of fast stock and race car chassis and bodles. Get dope on 100 m.p.h. stock V-8 Fords, 110 m.p.h. midgets, 120 m.p.h. Ford A and B conver- sions, 125 m.p.h. modified stock and 135 m.p.h. stock conversion speedway race cars. Order Today. Postpaid $1.00. C.O.D. $1.12. RAY F. KUNS Dept. A-3 Madisonville, Clnctnnati, 0. SUCCESSA while you are young enough to enjoy it “IT™ meeting Armstrong this afternoon at Ingleslde—last erent epee fi oF a little golf before we sail for Europe on the Pretty soft for Bob Carrington, you say—a lovely coun- try home, golf on a week-day when the other boys areslav- -` ing at the offce—a six weeks’ trip to Europe with the family—and all this wonderful success while he is still young enough to enjoy it! But why look with envy upon success well earned—espe- cially when itis within your power to aitain that same success? If men in business only reallzed how immensely valu- able are those early years, and how vital it is to get away toa Aying stort, they would make it an Inflexible rule to devote several evenings every week to home-study training.” One of America's foremost business men—an active di- rector in a dozen big corporations—made that statement recently; and Ifyou have the slightest doubt of its truth, you need only check it by the actual records of LaSalle— trained men, many of whom, though still in their thirties, are commanding five-figure salaries, Send for Free Information “I'm determined to succeed,” you say—and we do not deny that hard work and day-to-day experience will even- tually win some measure of success. If success 1s sweet, however, Isit not doubly sweet if it comes while you are Still young enough to enjoy it? And is it not a tragic wasje of years to continue at outgrown tasks, simply because you will not spare the time to master those bigger jobs that command the real rewards? Ten Years’ Promotion in One is a booklet that shows you how you can save years that would otherwise be wasted —and the coupon will bring it to you FREE. With this book we will send you, without cost or obliga- tion, particularsof the training that appeals to you, together with details of our easy-payment plan. Prove that you mean what you say when yousay that you want togetahead—by what you do with this coupon NOW. = = — —Find Yourself Thru LaSalle !=—= — = -~ LASALLE EXTENSION UNIVERSITY . „The World's Largest Business Training Institution Dept. 12493-R Chicago I should beglad to learn about your Salary-increasing plan as appiled to my advancement in the business field checked below. DO Business Management O Higher Accountancy DD Modern Salesmanship O Traffic Management DO Ratlway Station Man- ae agement Modern Basins = D Law—Defree of LL.B. Oo Pinata do ec nesi Cor O0 Commercial Law . O Expert Bookkeeping Industrial Managem't [] C. P. A. Coaching Modern Foremanship [] Business English PersonnelandEmploy- {] Commercial Spanish O Effective Speaking Paper Selling O Railway Accounting Banking and Finance ([] Telegraphy D 0 ment Management o QO Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers 149

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BEFORE Using SAV-AN'UPPER HOES LIKE NEW FARNY2$22°:% HOUR: | with SAV-AN-UPPER Sensational, new discovery makes it unnecessary to lay shoes aside or throw them away, when they become soiled, scuffed and shabby—saves buying new shoes. Sav-An-Upper makes the scuffed, discolored and faded uppers glossy, neat and good-lookIng as the day they left the factory. Quick, easy, economical. Takes only a minute. JUST BRUSH IT ON. More than u polish—more than a dye, Absolutely new and different. GUARANTEED, Hundreds of Other Money-Saving Uses Sav-An-Upper is also excellent for re- newing trunks, luggage, school bags, shopping bags, brief cases, leather up- holstery and cushions, auto tops, harness, reins, saddles, belts, wallets, leather gloves, etc.—in fact, any article of leather, canvas or imitation leather which becomes SAV-AN-UPPER Completely Covers the Old Uppers— ye Y Won't Rub Off No matter how soiled, discolored, scuffed, scratched or faded the old uppers may be, Sav- An-Upper immediately restores the attractive, polished, glowing neatness of brand new shoes. Sav-An-Upper completely COVERS the scuffed, unsightly leather, canvas, suede, reptile skin, satin or linen with a tough, waterproof, long-wearing, flexible coating that WON’T RUB OFF. Sav-An-Upper preserves scuffed, scratched, discol- the uppers and adds months and months of extra wear. ored or shabby, ACT AT ONCE! Agents and Distributors Breaking Profit Records FREE SAMPLE Men and women everywhere making tremendous profits—up to 202%. Desirable territories are being “snapped up” by hustlers. R Get your share of the Big Money. No experience necessary—SEND NO MONEY. i Write TODAY for claim proving sample and details. # The SAV-AN-UPPER CO. Dept. D-223 More Than A Polish More Than A Dye Guaranteed CINCINNATI, O. AUTOMATIC GAS LIGHTER 450% Proft. We pay P. P. Charges $9.00 15 DOZEN. Rush Name and Address for Sample, 10c. $9.00—15 Doz. Net Profit, $37.00 GREEN wooD HANDLES, BRASS HOOKS. Packed on Individual Cards. WRITE TODAY. NEW METHOD MFG. Co. Desk MG-24 " Bradford, Pa. MAN IN EACH TOWN To Plate Auto Parts, Reflectors, Bathroom Fix- tures, Refinish-Beds, Mirrors, Chandeliers, by new method; no capital or experience required. Simple plan of manufacturing at home starts you in big money making business. Outfit fur- nished. Free particulars and proofs. GUNMETAL CO. Ave. P Decatur, Ill. Suppressed Books of Bible 7 Reveal Man’s Inner Power Ancient fragments from lost and suppressed gospels teach that man has power within himself to bring success and happiness. The story of a new and amazing teaching discovered from the known and unknown sayings of Jesus and other teachers, which have been misunder- stood and suppressed for 2,000 years, and which reveal a strange inner power so dynamic and forceful that once contacted may bring man fulfillment of his visions of success and happiness, is told'in a 5,000-word booklet, “Key to Your Inner Power,” recently compiled by Yogi Alpha, noted American Philosopher and Metavhysician. 150 He tells of his belief that all the laws of the universe can be controlled because the laws themselves depend upon the great Universal Mind for their existence; that every mind is part of this universal mind, and if you learn to master and to use this universal energy it can almost overnight bring you many of the things you desire most. He further believes and teaches that this power is not limited to a fortunate few, but is latent in every human be- ing. His revolutionary teaching is attracting thousands of inquiries throughout the world. The author offers for a limited time to send this amazing booklet to readers of Modern Me- chanix and Inventions free of cost or obligation. It reveals the astounding secret which, mas- tered, may enable you within the next few months to unlock the reservoir of vast riches within YOU. For ,your free copy, address Psycho-Logic Institute, Box 98, Dept. 83-D, San Diego, California. Thank You for Mentioning Modern Mechanix and Inuentions for December When Writing to Advertisers

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Preparing Car for Winter Driving ` (Continued from page 65) fore putting in anti-freeze. To clean out ‘sludge in the system, fill with water contain- ing all the sal soda it will dissolve. Then ‘cover the radiator, retard the spark and run ithe engine until boiling takes place. Let the engine stand several hours, then drain the system and flush several times. Winter operation of the car makes heavy demands upon the storage battery. Greater power is required by the starter in cranking, yel the capacity of the battery is considerably decreased by the lowered temperatures. A partly discharged battery freezes readily. See illustration for suggestions on proper care of the battery. The generator charging rate can be safely increased to 18 amperes in winter. On most cars this is done by moving the third brush in the direction of rotation of the generator. Winter Grease, Oil Preferred As soon as cold weather comes, the grease in the transmission, differential and steering -gear should be thinned out with light motor oil. Do not wait until the grease becomes so stiff that shifting of gears becomes difficult. Make the grease just thin enough so that it will remain fluid in the coldest weather. A surer method is to drain out all the grease and replace it with a special winter grease. The engine oil should either be changed to a winter grade which is thinner than the summer oil, or thinned by adding a quart or two of kerosene. Here again the safest method is to drain the oil and put in a winter grade. The drawback to the use of kerosene is that it will vaporize or boil out of the oil. Dilution of crankcase oil with fuel is an- other winter driving problem. Fuel entering the combustion chamber strikes the cold cylinder walls and mixes with the oil upon them. As the piston travels up some of this mixture of fuel and oil passes the rings and is gradually worked down into the crank case. Frequent starting, idling and cold driving results in some cars showing an in- crease rather than loss of oil. Under these conditions it is advisable to change the oil frequently, every 250 to 500 miles. Selecting a Winter Gasoline There are three important requirements for winter gasoline. It should vaporize readily enough to start on the coldest days; it should not have ingredients which will condense readily on the cylinder walls and wash down into the crankcase; it should not knock or ping in the motor. If your motor does not ping on regular gasoline, its start- ing qualities and tendencies to produce dilu- tion will be satisfactory in winter. Third grade gasolines will have a greater tendency to knock and, as a rule, greater tendencies to dilute the lubricating oil than the regular. Premium fuels should be used for mo- tors with very high compression ratios where the anti-knock qualities must be very high. Excessive carbon deposits tend to accumu- late with intermittent winter driving. If pinging begins, an ethyl gasoline should be used to reduce the knock. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers . I furnish complete outfit—raw materials—secret Astonishing success reports coming in from the first hour of operatlon prove no rience is needed. and Sell CONFECTION! Here's your chance to start right in making big cash profits the very first day with new feod sensation. Enormous profits on 5 and 10c sales without cut price competition. Easy to operate— but little money needed to start —big season just ahead. OR IN SMALL STORE START AT HOME F R EE-»-Golden kernels of corn— marvelous book of facts mailed free-- no obligation--get the facta--act whileoffer Is open, formulas—complete plans—help locate and finance you. Make CARMELCRISP, the delicious candy popcorn confection—a food and not a fad. No canvassing. YOUR FORTUNE can be made—money worries banished—have a Pocketful of cash each night in this sensational business. Pa. man took in $454.06 first week, Rush name eday. CARMELCR A 1242 High St. CRISP. MACHINE sringfleld, Ohio CARMELCRISP MACHINE Co. 1242 High St. Springfield, Ohlo “Here's my name. Send all free material, Cameleon ip = —_ zad AUTO TRAININ High speed Diesels being rapidly de veloped for service in trucks, boats airplanes, streamline trains, shovels, etc. Trained men needed Opportunities increasing for good jobs. The trained man must be master of § all branches of auto repairing pre- 3 paratory to entering the Dlesel field. GOOD JOBS FOR TRAINED MEN Naticnal Automotive School trains you structors. A million d: by proven methods, EARN RO d training. F LOWED wwe. allow coach railroad, fare from any part of U. S, to L. A. You obtain complete auto and high speed Diesel trein- ing for price of one course, for limited time, Send coupon for free Auto-Diesel Book. NATIONAL AUTOMOTIVE SCHOOL Los Angeles Latest Equipment Dept. MMA-12, 4006 South Figueroa St. Send Free Auto-Diesel Book and Special offer.

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GO PLACES! with a T Popularity .. pleasure..fame..fortune.. all may be yours when you play a sweet~ toned Buescher Saxophone. Easy playing qualities and exclusive Buescher features give you quick mastery, Play tunes the first week. .make new friends..go places with a Buescher! FREE TRIAL; Easy Payments on sax- ophone, trumpet, trombone, clarinet— any instrument for band or orchestra, Write now for free Buescher Book — mention instrument which in- terests you. 1003-A, BUESCHER BANO INSTRUMENT CO. 1 Buescher Building, Elkhart, lodiana CAL TTI Showing my sensational, new, personalized Hat and Cap Sample Line—fits in pocket— displays values men grab for—rich felts— exclusive styles—superior qualities. Priced as low ag $1.95. Nothing to deliver. Just write orders and pocket your profits. Fit and Satis- faction Guaranteed. COMPLETE OUTFIT SENT FREE! You don’t invest a penny to get this $i money-making opportunity. aT even MADE. TO MEASURE Exclusive maker of national- give nee and caps to sincere sales- en. Send me your head size and 7 ri name—get the facts. You can start taramu Taylor palaproot pocketing cash in five minutes with Smart new patterns—lower my plans. Rush name. prices—no experience needed to profits hourly— TAYLOR HAT & CAP MFRS. Elliot, Utah, took five orders Dept. 6- 15-47 w. 6th SÈ" Chcinnati, Ohio _ [the frst 15 minutes. make big cas GET YOUR 1934 COPY NOW! HOW-TO-BUILD-IT Written by experts for AMATEUR SHOP FANS and PROFESSIONAL MECHANICS Crammed with simple, comprehensive plans telling you how to build midget cars, telescopes, radios, canoes, furniture, diving helmets, en- gines, iceboats, cameras, camping trailers, boats and a host of other fascinating projects. NOW on SALE Hie EVERYWHERE If your dealer cannot supply you, write to Get It Today MODERN MECHANIX PUBLISHING COMPANY 529 S. 7th St., Minneapolis, Minn. 152 | HowTo Secure A Ce alr Tells About These and Other Positions RAILWAY POSTAL CLERK $1850 to $2700 a year ggg POSTMASTER $1200 to $2500 a year SES POST OFFICE CLERK $1700 to $2100 a year R. F. D. MAIL CARRIER $1800 to $2300 a year FREE BOO K ts how I can help you get a Government Job. For 8 years I was Civil Service Examiner—have E helped thousands. If citizen 18 to 50, you may É r nad quallfy, Get ready NOW for a Government Position. Send for free book, Write or mail coupon TODAY, — A. R. Patterson, Civil Service Expert, 4312 Wisner Bldg., Rochester, N.Y. Please send me your free book ‘‘How to Secure a Gover Name . 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D, 24c extra. a anges 6 0 9 a = Special Super a Power 30X Telescope Similar to above but more powerful, Guaranteed to see 900 times larger in sur- face and 30 times closer. 31 mm. objective 4 powerful È lenses. Large field. Includes powerful microscope feature. S198 postpaid. 234 Fifth Ave., N. Y. BROWNSCOPE co. Dept. 57 How to Cash-in , with Your CAMERA Megnzines, Newspap Advertisers, are BUYING 134,000 pholos every weel Make good money — spara time, full time—takiog human-interest pictures that Sell. Earn while you learn howto take salable pictures! We teach you how by mail. Fascinating, easy! Our unlimited marketing service Bo yet rah fn uickiy. Write now, (no obligation), for FREE . ‘How to Make Money Wi our Camera. UNIVERSAL PHOTOGRAPHERS Dept. 576 10 W. 33rd St. A REAL MIDGET SHORT WAVE SET hlight cells! Weighs only, 1-Ib.! Woes m aH less from illustrated instruc- tions! 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PEIFFER CO, 11-A, 6 Columbia St., Newark, N. J. New York City “The Puzziemaker" & Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers

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My personal service assures speedy action and strictest confidence. Send immediately for my free 72-page booklet, “How to Get Your Patent.” L. F. RANDOLPH, 527-D Victor Bldg., Washington, D. C. Let me act as your Make money in advertising. Prepare quick! doting spare time Also earn while you learn, No experience necessary., easy method. Nothing else re it. Bend. at. Ne iyen free booklet — “Win D Suceess in Advertising’’, and ‘all particulars. No ol Page-Davis School of Advertising 3601 Michigan Avenue, Dept. 2059, Chicago, Illinois, U. S. A. STOP Your Rupture Worries! Why worry and suffer with that rup- ture any longer? Learn about my perfected invention, It has brought ease, comfort and happiness to thou- sands by assisting in relieving and curing many cases of reducible her- nia, It has Automatic Air Cushions which bind and draw the broken parts together as you would a broken limb. No obnoxious springs or pads. No salves or plasters. Durable, cheap. Sent on trial to prove it. Beware of imi- Never sold in stores nor by agents. Write today for full C. E. Brooks, Inventor tations. information sent free in plain, sealed envelope. H. C. BROOKS 136 State St., Marshall, Michigan Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers A:C-RADIO TELEVISION EVERY ELECTRICAL SUBJECT COVERED Here’s great news for anybody interested in Electricity. BRAND NEW edition of Applied Electricity brought right down to date with every NEW Electrical subject fully covered. 10 big Volumes and all shipped FREE for examination. BIG FIELD! Big Demand! F Beg inners Bi P l Men who understand electrielly Experts a ig PAYS ore urgently needed right naw in thousanda of industries. Autos, airplanes, machine shops— practically every industry depends on electricity and men who know this subject make big money. Pleasant, fascinating work, easy to learn and do; learn qolckiy with these books, Send coupon for a sot for FREE examination and sec for yourself. bf *{ifustrations — the most complete work of ita kind ever published. amos, motors, power stations, radios, television, everything elec- explained clearly so anyone can understand them, A year's consalting, membership’ k in the American Technical So- ciety now given free to all read- ers of this famous Cyclopedia of Electricity, Many say,’‘That’ 3 worth more than cost of books."’ AMERICAN TECHNICAL SOCIETY Dept. E9320, Drexel at 58th St. Chleago ee ee e + American Technical Society, Dept. E9320, Drexel at 58th St., Chicary Send for 10 days’ free use, BRAND NEW 10 volume set of Electrical Engineering. In return for mailing this coupon promptly, send free, certificate of membership in the American Technical Society entitiing me te full i Cgneulting p privilege for one year. ay the faw cents delivery charges on the books. I wish 1 may retum them in H days and owe you nothing, but If I keep them I willgend $2.00 after 10 daye, then $3.00 a month until the special price of only $29.80 is pald. Clty tate Attach letter stating ege, occupation and name and address of employer and at least one business man as reference, NE W! Every Motorist Needs AUTO-RECLAIMO a filter and re-refiner combined. Easily attached to exhaust manifold of cars and trucks. No more oil changes. Re- moves solids, water—prevents dilution and acid formation. Saves 80% of mo- tor wear. Our commercial size reclaims oil at 4c per gallon. Write for free particulars. Agents Wanted. M. SCHWALGE CO., 2510 Flournoy St., Chicago, Ill. | you can ride a NOW genuine Mead m bicycle 30 days without ‘“‘buying for keeps.” “ Return it at our expense if not satisfied. Write quick for FREE The color Catalog, marvelous new RANGER prices, special offers. SAVE 1% buying direct from MEADI ‘19% Mead’s Sentinel bike only $19.95 —Rangers a few dollars more, America’s finest quality bicycles at rock-bottom 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 line of quality bicycles if you hurry! Send no money—vwrite. TIRES jmsave, one “Halt on lampe. wheels, tires, equip- e 1 aar ria FREE! ` Dept. A289CHICAGO 22! pey Color, Catalog, 153

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NEW PRODUCTS BRING NEW BUSINESS Designed especially for women drivers who have difficulty in releasing pushbutton type emergency brake on autos, New extension handle brings brake lever closer to driver, where it can be set or released quickly with little effort. Listening in with headphones on any radio set is made easy by a tiny adapter unit having terminals for the phones, a clip to be grounded to the radio chassis, and a thin wafer which slips over the plate prong of the power amplifier tube. A tip-up machine for ice fishing, made of alu- minum and steel, holds the spare line on a reel under water where it will not freeze, auto- matically raises a flag to indicate a strike. Latest in home heating equipment is the in- visible radiator, built into the walls of the home. It can be completely plastered over or built with two small grilles showing. Fluorescent theatrical make-up coming in a wide range of colors makes hands and faces of actors glow brilliantly under invisible ultra-vio- let illumination. The make-up, coming in a harmless toilet preparation, is scarcely visible in ordinary light. New building bricks installed like shingles modernize old frame buildings at low cost. Cypress lathing is nailed over building paper, then studded with steel staples to hold 34” thick bricks in place. Mortar fills spaces between bricks. 154 A gleaming enamel cover fitting over the ex- posed cooling mechanism of the older electric refrigerators improves their appearance and in- creases the air draft through the cooling coils. A new window glass made with an air space between two layers of clear glass prevents for- mation of frost on panes in winter, and saves about 60% of the heat ordinarily lost through a window. Carbon-are health lamp unit screws into any electric room heater; with one carbon infra-red rays are obtained—with two, ultra-violet. The are automatically goes out after operating from 6 to 8 minutes, to prevent over-exposure. Perfect rounded corners for stairs and draw- ers are obtained by pressing a new three-cor- nered gadget into each corner. A serrated clip holds the spring- steel corner firmly in place. A new type heat regulating thermo- stat for the home sets new comfort records, maintaining constant room tem- perature to within ¥ degree. Being in- dependent of varia- tions in temperature in different parts of the room, it may be mounted as near the floor as desired, or even back of furni- ture. Knurled head screw with hexa- gonal hole in head is quickly started with fingers, tightened with ordinary pair of pliers if socket-wrench is not handy. Piston-ring expan- sion joints for steam systems, operating in much the same manner as auto pistons, may be repacked under 200 lbs. steam pressure. Cracked, weather-beaten airplane fabric is amazingly rejuvenated and stretched to its origi- nal tautness by a newly developed dope. The old finish does not have to be removed. Money lockers in various sizes up to 700 pounds operate from any light socket, opening cash drawer 15 minutes after combination is set. Money is put in through trap doors at top. Electric fire alarm rings house door bell continu- ally as soon as temperature near fuse element reaches 145 degrees F. Editor's Note—Addresses of manufacturers of these and other new products in this issue can be obtained by send- ing a stamped, addressed envelope to MODERN MECHANIX AND INVENTIONS, 529 South 7th St., Minneapolis, Minn. Manufacturers and inventors are invited to submit photos and literature for this page.

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FUN and PROFIT Lead Toys Complete Outfit... Each Junior Caster outfit comes in a large at- tractive box and includes a complete set of moulds for making 3 different figures thousands of times, also handles and clamp, large supply of lead, ladle, 4 cans of paint, and 2 brushes, Ideal Christmas Gifts Get a Junior Caster for Christmas. This fasci- nating outfit is chock full of fun and profit possibilities. ET this complete outfit. Learn how metal cast- ings are made. It’s fun to east lead soldiers, animals, airplanes and other metal figures. You can make all the toys you want. Junior Caster is a complete outfit for casting and coloring the largest, finest toys. You can also sell the toys you make at a big profit. Full details fur- nished in the 24-page illus- trated book. Fascinating! ONLY $950 Junior Electric Caster, $3.25 A brand new De Luxe Outfit including allthe reg- ular equipment, and a special Electrice Melting Ladle and Stand, designed for easy, rapidcasting. Educational! Insist on Genuine Junior Caster Ask for Junior Caster at your dealers or send the coupon. For good casting results demand the original JUNIOR CASTER out- fit. Avoid unsatisfactory imitations. Easy and Profitable to Operate It’s easy to make fine toys with Junior Caster, like the ones you see in stores. You can sell them at a profit. Make Over 200 Toys An Hour It won't take long to make enough toys to pay for your Junior Caster Outfit, and make real profits. Extra Moulds, 95¢...Choice of 128 Subjects All subjects can be made with one outfit, by simply buying extra moulds. Each mould makes 3 different, large figures. Choose from subjects such as Historical Figures, Sports and Athletics, Farm Subjects, Western, Wild Animals, U. S. Navy, U. S. Army, Continental Soldiers, and many others. Rapaport Bros., 717 W. Ohio St., Chicago, Ill. Enclosed find money order for $ (Postpaid in U. Check model wanted: chine Gunners, Please send S.) JUNIOR CASTER § Standard $2. p l Electric 3.2 O Wild West Cowboys. DU. S. ae COU. S. Soldiers. [Send FREE BOOK. Name Address OU arinegi rE State —— JUNIOR CASTER ==

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_...that Chesterfield Cigarettes are on sale in 86 countries al over the world, Ir means something Chesterfields may be purchas _ a a = — ans that for a cigarette r. ajoy such popularit

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uble Page Spreads

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The Book Opposite Contains Hav: you an invention—or an idea for one—that will save time, save labor, make money or give pleasure? If you have, this interesting, new FREE BOOK, was meant for you. It’s crammed full of practical, useful information that the man with an invention needs to know. Tells you facts like these: How the Patent Laws protect you and why, if you have an in- vention, you need a Patent at all; what a competent Patent Attorney can do for you; The Big Age of Invention Is Still Ahead Below is one of our newest trains. It’s the crack, streamlined express of the Union Pacific. Does 110 miles an hour, The whole train weighs only as much as a single, modern steel pullman car. This is only a glimpse of what’s ahead. Experts say that within the next ten years the railroads at ‘this recent invention, will have to be revolutionized. Henry Ford says that we're still living in the stage coach age. C. F. Kettering, Vice President of General Motors, says: “We're only entering the great period of inventive advancement.” Look t? Da elena around you. Every line of industry, every sphere of life, presents opportunity (hink of that myself?” ‘This to the inventor. Ten years from now, you'll see a different world; a world in which the inventor has made big changes, changes just as revolutionary as this streamlined train is today. Men who are poor today will be big financial successes a few years from now, because of inventions. what kind of a sketch or model is needed; how to make a disclosure of your idea right away, to help establish your claims; how some suc- cessful inventors have secured financial assist- ance; tells about interesting inventions that have proved successful and shows you 115 different mechanical principles that inventors have used in working out ideas; also gives much other in- formation that every man who has an inven- tion—large or small—can use to his advantage and profit. Read what the inventors below say about this book. Then, if you have an inven- tion yourself—even though it is still in the rough or crude stages—write us for a copy. Our busi- ness is to help you if we possibly can. You'll welcome a book of facts like this, Many Little Ideas Have Big Commercial Possibilities In contrast to the train be- low, a big development, look which is so simple that the average person is prompted say: “Now, why didn’t I invention is nothing more than a little metal strip, curved to fit par- tlally around the neck and under the cap of an ordinary ginger ale or beer bottle. When pulled out at the bottom, it forces off the cap, ren- dering a bottle opener unnecessary, A worth while improvement and the inventor has a patent, Simple, but it has in it the possibility of tre- J mendous sales and profits. An Invention needn't be complicated to be valuable. Your first step, if you have an Invention, Is to get the facts about Patent Protection. We'll gladly supply them FREE to serious, interested men. WHAT INVENTORS SAY: One inventor writes: “I want to compliment you on the publication of a book so replete with infor- mation naturally of great interest to inventors.’ Another writes: “Your book sure is a wonderful guide for an inventor, I shall keep together the book and all references to have same on hand.” Still another man says: “I have read your bool Patent Protection thoroughly and T feel sure that whenever the need of information arises I will know how to proceed in order to patent any device that 1 may happen to think of.” 12 Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers WHO ARE INVENTORS? Some of the most successful in- venlions have come from men who. didn’t consider themselves inyen- tors at all. A dentist invented the stock ticker; a bank clerk the hand camera; a school teacher the telephone, and a farmer invented the typewriter. No matter who you are or what you do, if you have an idea fur an invention that. will serre a useful pur- pose, you are entitled to your just reward and the Patent Laws are designed to protect the poor man and the rich man alike, But you must know haw tn take advantage of them. Our book will tell you how. IMPORTANT With the book, we will also send you a FRED copy of our ‘Evidence of Inven- tion” form, on which you can make a’ sketch and de- seription cf your invention and establish a date of sclosure. Such a dated osure may later prove important to you. We send full instructions. Any lete ters, sketches, drawings or models you send us are held In STRICTEST SE- CRECY by us. You can write üs frankly. But first get a copy of this remark- able book. 36 Years of Service This firm was founded over a third of a century ago. We have helped thou- sands of inventors protect their rights. We represent you personally before the U.-S. Patent Office. We have a large staff of Patent Specialists to serve you quickly, economically, effectively. Our book also tells you about a three-pay- ment fee plan that many inventors have found helpful. Write us a card, letter or send in the convenient coupon. De- cide NOW to know the facts. Do that today, i ons and guide þ ntive history mahamples i book for inve ake vention, this þe nt Of savin i ime, appointme > expense, 4 nt. We with our co We'll thi. faken S a real - If you have a he m eans > Even later dis- rel glad mpliments, 1y send you a copy 7 EVANS & CO. REGISTERED PATENT ATTORNEYS, i MAIN OFFICE: 520-P, VICTOR BUILDING, I WASHINGTON, D. C. Branch Offices: 1640.B Conway Building, Chicago; 1007-B Woolworth Building, New York; 514-B Empire Building, Pittsburgh; 1010-B Hobart Building, San Francisco; 736 Security Bldg., Los Angeles. Kindly send me FREE and without obligation, a copy of your book, | “Patent Protection,” and the "Evidence of Invention” form. 3 Street and No. .......... City or Town State Thank You for Mentioning Modern Mechunix and Inventions for December When Writing to Advertisers 13

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Random Chips from the Editors Workbench Big $500 contests open to all MM readers. Here are some new members of MM’s boat fleet. Scooter wins first prize in Workbench contest. MacRobertson, Australian millionaire, sends letter and photo. Jack G. Moody won first prize of $5.00 for the photo of his Scooter (top left). Second prize went to Jack B, Major for the Lark Jr. he built for $12. It is shown at right. The streamlined motor ice sled brought third prize to W. R. Davison. . Rye shop fan, handy man, and home lover should enter MM’s new $500 cash prize contests. We haven’t room to discuss details here, but we know every one of you has a good chance of winning one of the 56 prizes. Announcement and rules for the first of a series of four contests can be found on page 46. foi * * In the Workbench’s own little contest, prizes this month were awarded to three good examples of fine workmanship. First prize of $5.00 goes to Jack G. Moody, the first reader to send in a photograph of the Scooter, which was explained in a how to build article in the August issue. Moody says: Akron, O. Dear Editor: The scooter, planned for the small boy next door, was built from the plans in the August M.M. It is painted silver and vermilion with a half inch black line separating the two colors. The arrows and striping were first cut from gummed paper, painted and then glued on, making a professional looking paint job. The construction cost amounted to only sev- enty-five cents. And is the little boy proud of it! Jack G. Moody. Another Jack, this time Jack B. Major, re- ceived second prize of $3.00 for his photo and letter. For $12 he built Lark Jr., the 16 13%-foot outboard motor powered cabin cruiser, plans for which appeared in the October, 1933, issue. Here’s his letter: Little Rock, Ark. Dear Editor: I am sending you some snaps of Lark Jr. I built it last spring. It shows you what a A letter from MacRobertson (above), Australia’s cocoa magnate, complimented our Sept. MM story on the London- Melbourne air race he sponsored. Photo shows first prize. Modern Mechanix and oe 1. S. T. Dickinson’s “Dorothy”; 2. Chas. H. Peer’s “Sea 9 has these new members: MM s BOAT FLEET Skeeter”; 3. L. R. Healy’s “Sunray”; 4. Sergt. R. Glenn’s “Tar Baby”; 5. Frank K. Owen’s “Sunray”; 6. Fred Kahs’ “All Sorts”; man can do with good old MM and twelve bucks. That is what it cost me less the motor. She will do eight to ten miles an hour right along. Jack B. Major. Blueprints for this midget cabin cruiser are now available for $2.00. + * * With the ice season right on our heels we couldn’t resist giving third prize of $2.00 to Wallace R. Davison’s excellent photo of his streamlined ice sled. He tells us: Minneapolis, Minn, Dear Editor: I am sending you a picture of my stream- lined ice sled which I built up out of an old Chev. chassis and reinforced with an X. It is powered with a supercharged Star motor and will do 60 miles an hour. Brakes, steer- ing wheel; and spring mounted runners give the riders a floating ride with comfort. and safety at all speeds. Wheels are interchange- able in place of the runners and it can be taken wherever I wish. Wallace R. Davison. * x + MM’s boat fleet continues to grow in num- bers and popularity. Every month we re- ceive several letters and photos from ap- preciative readers who have built and are pleased with MM’s boats. A few of the Inventions for December . Joseph Bus’ “Monotype.” Send your boat photos and join the fleet. photos are grouped in the composite pic- ture above. If we had space we’d quote all enthusiastic letters. Here are some excerpts: Frank K. Owen, St. Paul, Minn., says about his “Sunray”—"Had a great time sailing her. She handles very well.’ Joseph Bus, Ham- tramck, Mich., about his “Monotype”—*It is easy to handle and will outsail anything with the same sail spread or length of hull.” S. T, Dickinson, Evanston, Ill., about his “Doro- thy”—"She is a dandy little job. Powered with a Universal Flexifour 20 h.p., she makes about 10% m.p.h.” Charles H. Peer, Maplewood, N. J., about the “Sea Skeeter”-—"She has been on most every lake and stream in New Jersey. Every time we go on an outing Sea Skeeter is perched on top of old Lizzie and goes with us.” L. R. Healy, Yarmouth, Nova Scotia, about “Sunray”—Had a great deal of fun and pleas- ure building and sailing her and found your plans easy to follow.” Fred Kahs, Prince Bay, New York, about ‘All Sorts’—*This was my first attempt at boat building.” Sergt. R. Glenn, Rizal, Philippine Islands, about “Tar Baby” —"She sure is a honey. Rough water, surf and wind, she takes them all nicely.” * * * Every month the Workbench awards three prizes for the best photos, accompa- nied by interesting letters, of the models, furniture, radios, boats, etc., built by MM readers, What have you to offer? 17

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4, 4, 4 Play safe this year with sence EVEREADY PRESTONE THE GUARANTEED ANTI-FREEZE $2 9 5 Ons suor of Eveready Prestone... put in now... will'keep your car safe. For . every drop of Eveready Prestone is protection from both freeze-up and rust. At $2.95 a gallon Eveready Prestone is ALL ANTI-FREEZE...no water... Per gallon no dilution of any kind. Make the Nose Test: Eveready Prestone, truly non-evaporating, is odorless. But “boil-away” anti-freezes can always be identified by a noticeable odor. Regardless of special “treatments,” claimed to decrease evaporation, they will evaporate rapidly when the engine runs at high speeds. A SPECIFIC GUARANTEE P National Carbon Company, Inc., spe- ish, or to the metal or rubber parts AO, 992s 00, O'i P a ags "3 J alow / 2 | 295 cifically guarantees that Eveready of the cooling system, and that it will ars, ey - Prestone, used according to direc- not leak out of a cooling system tight apo tions, will protect the cooling system enough to hold water. National Car- 2/248, of your car against freezing and clog- bon Company, Inc., General Offices, ging from rust formations fora whole New York, N. Y. Unit of Union ‘Winter; also that it will not boil away, Carbide [MẸ and Carbon Corpora- will not cause any damage to car fin- tion. IT’S ALL ANTI-FREEZE...NO WATER BOILING HOT on a cake of ice! T SEEMS like black magic to some, but—a pan of A sure guarantee against such a dilemma is clear liquid will boil merrily if placed on a cake Eveready Prestone—the all-Winter concentrated = of ice. Of course, the liquid must have an extremely anti-freeze. Don’t confuse Eveready Prestone with low boiling point, like liquid air, boiling at minus either glycerine or alcohol. By actual tests it pro- 318° Fahrenheit. Apparent paradoxes of heat and cold are com- mon. In Winter, if a motorist uses an anti-freeze with a boiling point lower than water, sooner or later it boils off. Any anti-freeze with that “‘boil- away” odor will boil off, regardless of special “treatments.” Then, his car “freezes” . . . that is ta say: Tiny particles of ice in the radiator-core clog the circulation and cause over-heating around the engine-head. Thus in coldest weather his car boils . .. boils away the anti-freeze, and badly damages the car with heat. Magic? No—carelessness! tects against rust from 5 to 20 times longer than other anti-freezes. It is undiluted, guaranteed one- shot protection, down to 60° below zero, if desired. Prevents “‘freeze-up,” rust, and corrosion. It will not boil off, and is absolutely odorless. Full protection so inexpensive! Read the full guarantee above, and protection chart on the opposite page. Here you will see how inexpensively your car can have Eveready Prestone protection all Winter long. 26 Thank You for Mentioning Modern Mechanix und Inventions for December When Writing to Advertisers Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers =

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HENRY FORD Henty Ford (left) and his son, Edsel, are shown above on top of the administration building overlooking the River Rouge plant, the heart of Ford's automobile industry. ENRY FORD, the industrial genius of modern times, sees industry entering a vast, wide-open era of experiment, inven- tion and discovery. He believes that in the next twenty-five years man will achieve re- sults overshadowing the dreams of today. This new trend has already begun under the stimulation of Henry Ford’s inventive mind. He is convinced that the farm will be the scene of great industrial development and that chemistry will be the agency by which these changes will be evolved. A start has been made in this direction. Science is discovering means of transform- ing products of the farm into materials for manufacture. Through his experimental farms, Henrv Ford now. successfully con- v automobile E : 30 per cent o astic indus- t agriculture, S possibilities é As an ex- é laboratories 1 an a tough, I rial which : £ ids without bi vasiug. 36 An unusual view of Ford plant in Dearborn, part of the industrial empire that has grown up in 40 years. This material is as light as wood and some day may be as hard as steel. The ways in which this new Ford material may be employed are almost unbelievable. It has been developed to the point where it could be successfully used in making desks, chairs, and other furniture now in daily use. Ford and his chemists envision the time when automobile bodies, houses, sky- scrapers and even great monuments may be fabricated from the soy bean. Those who have the urge to create, to invent and to discover need not be bewil- dered by this picture of the future. Mr. Modern Mechanix and Discusses Americas INDUSTRIAL FUTURE In this exclusive interview Henry Ford predicts that the farm will be the scene of industrial development. He points the way to success for today’s inventors and looks upon chemistry as the link between a more prosperous agriculture and industry. by: Henry Ford and his son ate shown with first lathe, one of early power tools that turned out first Ford cars, Ford hastens to explain that there is nothing complicated about the new technique. It is based on formulas that are not too com- plicated. The soy bean, for instance, con- tains fats, carbohydrates, and proteins. By a simple process of chemistry these are separated. The fat, or oil, is used for paints, Inventions for December GLENN F. JENKINS This informal picture of Henry Ford resting in a field recalls his statement: “I have never worked so hard on anything as on the problem of reuniting farm and factory.” lacquers, food stuffs, and countless other things. The protein or bean meal becomes the plastic raw material which can be shaped to suit many purposes. The molding technique, within casy reach of the ambi- tious experimenter, is not complicated and calls for only 2,000 pounds pressure and 350 degrees Fahrenheit. But what of the unknown inventor? How does he fit into such a picture, Mr. Ford was asked. Things are done on such grand scales nowadays. Great laboratories have been built to solve the problems of mankind. In them are the polished minds of the schools. Brains have been regimented. Has the individual been hopelessly submerged? To this Mr. Ford gives an emphatic denial. Genius, coupled with a desire to create something, to lessen drudgery and improve our modes of living, need not look far, ac- cording to Mr. Ford. He may start from 37

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How SCIENCE TRAPPED Above—Albert Osborn, handwriting expert who, after study of ransom notes and Hauptmann’s writing, de- clared both were written by the same man. Right— B. C. Farrar, a government expert who, before Haupt- mann’s arrest, said the writer was a German carpenter. by PETER LEVINS NEVER has science played a larger part in a criminal investigation than in the Lindbergh kidnaping case. From the very night that Charles A. Lindbergh, Jr., was stolen from his crib in Hopewell, N. J., the best scientific brains of the nation have been at work on the meagre clues left by the murderer. Investigators simply had to call in the laboratory experts. The clues were so few that ordinary police work would not avail. All the authorities had as evidence were the ladder used by the kidnaper to reach the nursery; the carpenter’s chisel found near the ladder on the Lindbergh estate; the ransom notes; and, finally, the ransom bills that turned up in New York and vicinity. Every known device of science was used to reproduce, from this scanty evidence, the figure of the mysterious “John the Kid- naper.” That he was reproduced to a most startling degree constitutes a real triumph in modern detective work. The ransom money finally led to Bruno Richard Haupt- mann, German carpenter. It is not at all unlikely even if the ransom money had not led to this suspect, police would have been able to seize the kidnaper through the scien- 42 tific evidence gathered from the ladder, ransom notes and money. Before Hauptmann was arrested police had a good picture of the man suspected of the kidnaping. As a result of researches of scientists, they knew their man was a car- penter and a German who probably lived in the Bronx. They knew that the person, who had the ransom money, had buried or hidden it. Even the general features of the man were known through a composite pic- ture drawn by an artist in the Department of Justice from descriptions gathered from scientists and from Dr. John (Jafsie) Con- don, the intermediary who delivered $50,- 000 to the kidnaper in a New York ceme- tery. The expert who tackled the seemingly impossible task of tracing the lumber used in the construction of the ladder was Arthur Koehler of the United States Forest Prod- ucts Laboratory at Madison, Wis. Koehler is the leading man in the country in this line of work. Purely by laboratory methods, combined with his own extensive knowledge of wood, he can find out as much about a piece of lumber as a medical expert can discover by an autopsy on a human body. His tests de- termine exactly in which forest a certain fragment of wood originated. His micro- scope picks out every single mark or inden- Modern Mechanix and Lindbergh Kidnap Suspect Above—keg of nails found in Hauptmann’s garage. The nails are said to be similar to those used in the kidnaping ladder. Right—Photo of Hauptmann and below composite picture drawn before his arrest. Note the resemblance. Right below—Col. Lindbergh, with police guard, entering grand jury room, tation. He can tell whether a hammer used in a piece of work was worn on one side, or otherwise marked. He can distinguish every infinitesimal flaw in the cutting edge of a chisel or saw. He declares that every tool makes a mark as individual as a human fingerprint. After studying the fibre of the wood used inthe ladder, Koehler traced the wood to a particular forest in California. From the forest he traced it to the mill that cut it. And from the mill he traced it—though this final phase of the search took many months —to the National Millwork and Lumber Corp., White Plains Road, the Bronx, where, it later developed, Bruno Hauptmann had worked. A major achievement, this. And done al- most exclusively in the laboratory. After Hauptmann’s arrest Koehler set up a laboratory in New Jersey and set about tracing every stick of wood used in the con- struction of the suspect’s garage, where so much of the ransom money was dug up by the police. The ransom notes produced a mine of information when subjected to the examina- tion of experts. Very carly in the case, even before the child’s body was found, B. C. Farrar, handwriting expert of the United States Treasury, told Colonel Lindbergh that the writer of the notes was a methodical German carpenter. The habit of combining words—“sleepingsuit,” for instance—was (Continued on page 140) Inventions for December

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*500.00 CASH PRIZES Fifty-six prizes, $500 in cash, await readers of Modern Mechanix and Inven- tions in a series of four monthly contests. Each contest will differ from the other. In each one 14 prizes totaling $125 will be awarded. In all four contests readers will have an opportunity to win 56 prizes or $500 in cash! This month 14 prizes, totaling $125 in cash, will be awarded to the best suggestions received on improving a home. Tell as briefly as possible how you would convert an attic into a den, a porch into a sun parlor, an ordinary frame house into a colonial type home, or any one of dozens of possible improvements. You don’t have to own a home to enter this contest. - In your entry describe briefly how you would carry out the construction steps involved in remodeling some part of the house. You will find it easier to confine your entry to one section of the house, such as the porch, the attic, base- ment or roof. Read the rules on the next page. The following article will give you some idea on how to prepare your entry. by DALE R. VAN HORN INGY basements can be converted into luxurious living room or recreation room quarters with such ease and economy that it is becoming the smart thing to do. CONCRETE AIRWAY GRADE LAWN UP TO GASEMENT WALL LIKE THIS POLISHED. ONE OF COPPER BRASS OR TIN Build airways to put windows in low base- ments. Slope lawn as shown. Drawing shows indirect light. SHOWING WAY. O CUT RE Surprising results can be obtained as shown by the accompanying photo- graphs. By simply furring the walls and floor and using any onc of several suit- able materials for the finish the base- SEE JANUARY M-M 46 Modern Mechanix and Tack wallboard panels to 1x2" furring strips which are fastened to the cement basement wall with toggle bolts or cement nails, for HOME Improvements This attractive base- ment has an artifi- cial fireplace, natu- ral wood finish, patterned ceiling. ment becomes a suitable place in which to live. Finished with patterned, paneled wall board, you can have a basement that you will be proud to show to anyone. The sim- plest treatment is merely to waterproof the walls, then paint or kalsomine them, cover FOR NEXT CONTEST Inventions for December This basement was converted into a pleasing den at little cost. The fireplace is covered with log siding and the walls with pine boards finished in their natural color. the ceiling with wall board, then paint or varnish the floors. You will enjoy planning a subdivision of the basement into a group of attractive rooms. Before undertaking the work, re- pairs and a general checking of conditions must be made. Here are several things to look for: seepage through the walls, cracks in the walls, low spot in floor, exposed elec- tric wiring, rotted support columns, and RULES FOR FIRST CONTEST Suggestions for improving any part of a house can be entered in the contest. Cost of home improvement must be limited to $100, not including paint or labor, Improvement must not call for professional ser- vices. All work must be within the scope of the average home workshop man, Each entry must include a written description: of 1,000 words or less, giving detailed instructions on carrying out the house improvement. Rough sketches to illustrate suggested changes should be included. Photographs are not required. Modern Mechanix and Inventions reserves the tight to publish any entry winning a prize without further compensation to contestant- Each contestant agrees to permit Modern Mechanix and Inventions to publish all or part of any entry not winning a prize. Entries so used will be paid for at regular rates for amount of material published. No entries will be returned. The most useful and practical entries submitted will be awarded 14 prizes: First prize $60.00; second prize $20.00; third prize $8.00; five fourth prizes at $5.00 each; six fifth prizes at $2.00 each; total $125.00. Address entries to Home Improvement Contest, Modern Mechanix and Inventions, 529 S., Seventh St, Minneapolis, Minn. All entries must teach this office before midnight, December 22, 1934. Winners will be announced in the March, 1935, issue of Modern Mechanix and Inventions. An entirely dif- ferent contest offering another $125 in prizes will be announced in the January issue.

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Bye WPORT START AND FINISH DIRECTION OF WIND a. GEANC COURS! By 51" TIME~ Shr. 9'1” R Vafonnet Pt. FIRST RACE Cuttyhunk Z. CA WINNER ENDEAVOUR By 2 minutes 9 seconds TIME ~ 3 hr. 43 min. 44 sec, FIFTH RACE. WINNER ~ RAINBOW Rainbow THIRD RACE WINNER ~ RAINBOW by 3' 26" TIME 4 hr, 35° 34" Endeavour 6" 39" Above is a record of courses followed by the two sloops in ali races. According to the rules races were alternately fifteen miles to. windward or leeward and return and tri- angular with sides of ten miles each. “Endeavour” missed mark in filth and went wide of second mark in sixth race. PEED lost in the America’s Cup Races. The sixteenth international sailing clas- sic witnessed the paradox of an apparently faster ship going down to defeat. Rainbow’s victory upheld America’s sail- ing supremacy. The British, on the other hand, have only the consolation of knowing that for the first time in 84 years they had an opportunity to bring the “old mug” back to England. The simple statement that America won when Rainbow defeated the British En- deavour four out of six races hardly tells the story. Most experts agreed that the Brilish sloop was faster than Rainbow, yet Endeavour was decisively beaten. Why? Mainly because the comparatively inexperienced amateur British crew bungled so badly in handling ship and sails. The professional American crew made no mistakes. Then, too, experts concede that the British skipper, T. O. M. Sopwith, 54 FOURTH RACE WINNER ~ RAINBOW by ie" TIME 3hr. 15' 38" TOTAL SCORE IN 84 YEARS OF RACES United States Sailed 49 Races; Won 44; Lost 5 Britain and Canada Sailed 49 Races; Won 5, Lost 44. Rival skippers shake hands. can defender (left), and T. O. M. Sopwith, challenger. Modern Mechanix and Harold S. Vanderbilt, Ameri-° VENTILATED SPINNAKER MAINSAIL o} Here are principal sails used by Gomme cng yachts. Above is the ventilated spinnaker introduced by “Endeavour,” In circle is “Rainbow” with double clew or Greta Garbo jib. At right is “Endeavour’s"” Genoa used by both ships in reaching. wealthy airplane manufacturer, could not match the superior sailing tactics of the more experienced Harold S. Vanderbilt, skipper of Rainbow. Both Rainbow and Endeavour represent the best in their class among racing yachts. Both can be termed “mechanical ships.” Both have metal hulls, Endeavour being the first challenger constructed of steel, Rain- bow’s mast was of duralumin; Endeavour’s of hollow steel. The British ship had four- speed winches compared to the American’s two-speed for handling stays and sheets in various wind pressures. The British ship was equipped with two speedometers and an electric wind vane and pressure gauge. She was the first chal- lenger to have these modern improvements. Her skipper was able to see the slightest variation in wind instead of relying on his judgment as in the past. Sopwith called on the science of aero- Inventions for December WHY | aca JOST IN America’s Cup RACES sane: bon nautics in rigging his ship. He made wind tunnel tests of a model of Endeavour to dis- cover the most efficient combination of various sails. Handling of these sails proved to be the leading factor in his defeat. The ships this year used jib and staysail in going to the windward compared to the former three headsails. The jib used on both ships is what is called a double-clew sail. The after-part of this large sail was cut off and two sheets attached to make it set better. That made it quadrilateral in (Continued on page 145) 55

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Heroism at sea is usually more evident among passengers than crew, declares the author. This woman, survivor of the Morro Castle, braved icy waters by diving overboard from the burning ship. She was picked up by a rescue ship. N THE dark hours before dawn that ter- rifying word “Fire!” aroused passengers on board the Morro Castle from their peace- ful slumbers. In the radio room the opera- tor tapped out the sea’s signal of distress— “SOS.” Within an incredibly short time the ship, a modern liner, was a blazing holo- caust. Passengers and crew jumped for their lives. Some escaped in lifeboats. Some were picked up by rescue ships. A few swam eight miles through the cold, choppy sea to the safety of the New Jersey shore. But when death’s toll was counted, the Few passengers were saved in the lifeboats of the Morro Castle. Members of the crew were predominant in the boats, such as this one, that reached the Jersey shore. 60 CAPTAIN FELIX RIESENBERG An authority on sea topics, Captain Riesenberg sailed the oceans of the world in sail and steam. He is a member of the U. S. Naval Institute and the Society of Naval Architects and Marine Engineers. lives of 132 persons were charged to this latest disaster at sea. The burning of the Morro Castle vividly brought before the public the ever-present danger of fire at sea. That public now looks to the government, to steamship lines and to science to reduce this most dreaded haz- ard of the sea. History shows that one by one other haz- ards, resulting in disaster, have been re- duced to negligible percentages. The sink- ing of the La Bourgogne in 1898 with a loss of 562 lives resulted in improved discipline and training of crews. The collision of the Republic and the Florida in 1909 showed ihe value of radio and led to its compul- sory use. The loss of 1,517 persons on the Titanic in 1912 after collision with an ice- Modern Mechanix and Accusations, protests, and investiga- tions have followed every major tragedy at sea. Will the Morro Castle’s burned hulk leave a lesson for the world? This article discloses the need for greater safety at sea. berg resulted in the establishment of the International Ice Patrol. More recently the Vestris, in which 110 persons met death, showed the necessity of rigid inspection of ships, Radio beacons, echo depth sounders, and submarine bells have reduced the chance of grounding. Fire in the holds and bunkers of cargo craft is now controllable by the use of steam, carbon dioxide gas and foam spreading apparatus. But fires above the cargo holds, in the congested passenger quarters of the most modern ships, are still to be conquered. Fires on the high seas in modern vessels are not unusual and are not among the Inventions for December Above, an aerial view of. the: Morto Castle afire with rescue ships in the background. The forward end of the ship was scarcely damaged by fire, the officers remaining there safely until taken off by the coast guard. In. lower photo National Guardsman examines undamaged clothes left by’ passengers on stern when ship was abandoned. things that cannot happen. Any wisp of smoke, the slightest indication of flame, may be the beginning: of a major tragedy. The Morro Castle will serve to further drive home a warning and must give everyone a definite sense of the grave danger involved in any fire at sea. Whatever the original cause of the Morro Castle fire, carelessness, defective wiring, explosive brass polish, oil fumes, or a com- (Continued on page 135) 6l

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PREPARING Flush out and clean cooling system with sal soda, then replace all soft or damaged hose connections, before put- ting anti-freeze solution into your car radiator this winter. IROUBLE-FREE winter driving can be obtained only by careful attention to the car before cold weather sets in. Too many automobile owners, putting off necessary winter preparations in the hopes of saving a little money, are caught unprepared by an unexpected cold spell. The cooling system is generally the first to be affected by wintry temperatures. Wa- ter in the lower hose connection freezes, stopping circulation through the radiator. Adding anti-freeze compounds with the en- gine in this condition is worse than useless; the lower water connections must first be completely thawed out. Hot water poured on the outside of the frozen pipes will be found very effective. Covering the radiator front with a blanket keeps some of the ex- hausted steam inside the hood where it may heat the air surrounding the frozen pipes until they thaw enough to allow the water to circulate. The wise motorist anticipates the cold snap and prepares his cooling system be- fore hand. Of the many compounds avail- able, each has its advantages and draw- backs. Denatured alcohol is used very exten- sively. The addition of a sufficient quantity will effectively prevent freezing at any tem- perature encountered in the civilized world. It does not injure either the engine or radiator, but alcohol vapors or the liquid, if spilled, will attack the finish on a large number of cars. Boiling at a temperature of about 180 degrees, the losses by evapora- tion necessitate frequent additions to the 64 YOUR CAR by PROF. B. J. ROBERTSON Mechanical Engineering Department University of Minnesota HYDROMETER AT 1270--- CHARGED 1150--- DISCHARGED = DEDUCT ! POINT FOR EVERY THREE DEGREES BELOW BO° FAHRENHEIT z WATER. LEVEL 14 INCH ABOVE PLATES Inspect the car battery weekly during cold weather. Make temperature corrections to hydrometer reading as shown above. Add distilled water before, not after using the cat. What nti P a Shall J ALCOHOL Denatured Wood or Methanol Most commonly used anti-freeze. Evaporates rapidly on long drives. Cheap, effective if enough is used. Withstands much lower tempera- tures than denatured product. Poi- sonous, with fumes often produc- ing nausea. Does not harm engine. GLYCERINE ‘When pure, does not attack engine or block. Does not evaporate in engine. Mixes readily with water. Cost low. Favorably increases op- erating temperature of engine, de- livering more heat to auto heater. Inflammable when hot. Injurious action on rubber, requiring yearly hose replacement. Remove all wa- ter from radiator before pouring in oils. No. 10 lubricating oil, cheap grade, or crankcase waste, gives same results with less danger of fire. KEROSENE, DISTILLATE, OR LUBRI- CATING OIL STRAINED HONEY Thicker than glycerine. Much greater proportion needed to pre- vent freezing. Extremely thick whea cold, interfering with circulation. ETHYLENE GLYCOL Much thinner than glycerine, non- corrosive, and will not boil away in car, Ethylene glycol mixture (such as Prestone) is ideal for winter trips. CALCIUM CHLORIDE Generally obtained in inexpensive commercial solutions. If engine gaskets are leaky, corrosion may take place. Should not be spilled on electric wiring or car finish. Modern Mechanix.and for WINTER DRIVING With the advent of below-freezing winter | temperatures, hew problems confront the motorist. Radiator and battery must be pro- tected against freez- ing, oil and grease changed, and consid- eration given to the gasoline being used. A noted authority here tells just how to ... foil “King Winter.” LOW GRADE—if car starts easy, gives no carbon knocks. REGULAR— it car is hard to stare or misses with cheap gas. HIGH TEST—for new high compression cars with good rings. ETHYL—stops knocks. radiator, especially where drivers cover Jong distances daily. Wood alcohol and Methanol—an alcohol made from coal—are even more effective than the denatured product. A 50% solu- tion of denatured alcohol freezes at 18 de- grees below zero while a 50% solution of wood alcohol does not freeze until 40 de- grees below zero is reached. Wood alcohol is poisonous; its fumes, while not so offen- sive to many as those of the denatured prod- uct, sometimes produce a nausea. Glycerine, when distilled and refined properly, does not attack the radiator or engine block. Be sure that the glycerine you buy is pure. In adding it to the radiator, it is much better to stir the glycerine and wa- ter together in an outside container. Some manufacturers market it ready-mixed with water in cans. When once in a solution with asmall proportion of water, it mixes readily with additional water, and may be poured directly into the radiator. Ethylene glycol is being manufactured in quantities for radiator protection. It is much thinner than glycerine, is not corro- sive and like glycerine will not boil away at temperatures more than 150 degrees above the boiling point of water. Only wa- ter need be added during the winter so long as there is no loss by leakage. This anti- freeze is ideal for long winter drives. Calcium chloride solutions are very inex- pensive and may be made freeze proof at 50 degrees below zero. While less corrosive than a salt and water solution, they are very Inventions for December Aids in burning out carbon deposits. Steaming radiator is sign of careless, unprepared motorist. Put anti-freeze in car early, to be prepared for first cold spell, then check often to keep it at proper concentration. troublesome when used in an automobile cooling system. If gaskets are leaky, corro- sion takes place between the cylinder head and the block, oftentimes making it almost impossible to remove the head. Do not spill the solution on the ignition wiring because short circuiting may result. The radiator and cooling system should be drained and thoroughly flushed out be- (Continued on page 151) 65

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Behind the SCENES on A mixture of charcoal and powder, wired to Redmond’s control board, provided this thrilling but harmless ex- plosion as movie troops went over the top, Safety is assured the actor-soldiers by construction of the shell pits which are built to expend explosive force upwards. 68 A civilian defends his home during a movie battle; but the machine-gun fires blanks. Dynamite caps, wrapped in cot- ton and tape and fired from control boards by Harry Redmond, shown at left, supply the illusion of bullets actu- ally striking earth a short distance away. by HARRY REDMOND Hollywood Explosives Expert PUSHING forward across a huge battle- field, 4000 movie soldiers, many of them veterans of World war shell fire, quickened their steps as the earth mushroomed sky- wards to the explosion of a heavy shell. Machine-gun bullets furrowed the ground at their feet; shrapnel screamed overhead; great geysers of earth were hurled high in the air as the barrage swelled to a thunder- ing climax. From my firing board beside the cameras, I surveyed the scene with satisfaction. Ev- erything was working out with split-second precision. Suddenly my nerves tensed as a terrific roar tore the very heavens open. Twenty-five large pine trees, previously loaded with dynamite for the effect of shell fire which would tear them from their roots, had exploded ahead of schedule. Redmond’s Biggest Movie Explosion Unwittingly I had provided the biggest explosion ever set off on land for moving pictures—twenty-five cases of dynamite! I had planned to touch off the trees one at a time, but the concussion proved so power- ful that the dynamite went up with a roar, spreading in a few seconds from the middle tree down the line to both ends. Yet so carefully had we notched the trees near their bases that not one man was injured. In two decades of providing thrills of a hundred major battles and minor skir- mishes for pictures I have fired on fully 30,000 troops without a single casualty. Sometimes only a few hundred men ad- vanced through my barrages, while again the “troops” numbered thousands as they went over the top and marched grimly Modern Mechanix and lovie BATTLEFIELDS Harry Redmond, ‘Hollywood’s war ‘lord, ‘has laid down barrages of high ` explosives. on | more “than 30,000+ : movie troops without .a casualty. In Sthis article he ‘reveals the secrets : -of how he. wages war. for the movies. through what appeared to be a withering fire of high explosives, shrapnel, mines and machine-gun bullets. From “battle organs,” or firing boards, connected through thou- sands of feet of cable, my assistants and I spot these shots to explode within a few feet of the uniformed men, yel the actors are never in danger. I have fought battles not only on the sur- face of the earth, but also in the air and on the sea. The secret of staging these safe but | realistic battle scenes lies not only in de- pendable aides and equipment but, more important, in a retentive memory. With a telephone clamped to my mouth I issue or- ders to as many as five assistants who spot the explosions in the background, in the middle-ground, near the cameras, on sides and center, while I stand before my own board closing circuits which one minute rock the countryside with explosions of (cca giant shells and the next splatter the Harry Redmond, explosives expert, ts shown at the elec- trical control board with which he fires on troops as = shown in the panel, right above. At the immediate right are mortars used for shrapnel or anti-aircraft shells. Inventions for December

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Finding Your Way When LOST IG game hunters ofien must go miles away from civilization as they tramp through the woods and hills seeking deer, moose, and other game. When snow obliter- ates trails and game leads hunters far off the beaten paths, there is a constant danger of becoming lost. Becoming lost is not as terrible an ex- perience as it may seem if the hunter knows a few simple rules that will help in finding the way back to camp. The big danger of getting lost in the woods is becoming panic stricken. So great is this danger that a few helpful hints on finding one’s way through the woods will be given before going into a general discussion on guns and tips on hunt- To set a course look at compass, line up three trees as shown, Hunt- er has selected trees for a southwesterly course. ing such game as deer, moose, and moun- tain sheep. As a precaution against becoming lost carry a good map of the region in which you are hunting. Make this accessory as necessary to your equipment as your gun. if possible, get’ a detailed county map. Topographical sectional maps are obtain- able from the government for some parts of the country. Study the map, noting the physical nature, lakes, heights and streams of the region. A large lake may be the center of the immediate region. If you get lost you can climb the tallest tree near you and at once locate the laké. A railroad running through the region is a certain means of finding your way out. Knowing if it runs east and west or north and south your com- pass will then tell you which way to go. Snow Is Both Aid and Enemy When there is snow on the ground, quite often you can follow your own foot prints back to camp. If there is no snow or if it has been snowing steadily while you have been in the woods, it will be difficult to trace your way back. Trails in the woods can not be relied upon, as they lead in all direc- tions. Main trails, however, lead to definite places, and can be followed. In the north woods, if your compass shows that a main trail runs north and south, you can be fairly certain of finding some form of civi- lization by taking the trail to the south. Get in the habit, when off the beaten SGU FT: ELEVATION A topographical map is very valuable in the woods. If lost, hunter has several landmarks on above map to get bearings, such as the river, 560-foot hill, and railroad. By climbing tree he should be able to see at least one of these landmarks. 74 Modern Mechanix and in the WOODS track, of walking in a straight line, which is readily done by lining up with trees ahead of you. By keeping three or four trees in view it is an easy matter to keep a general straight line. Unless this is done, one is likely to walk in a circle, the common habit in the woods when Jost. Trust your compass. If it says North, then believe it. As soon as you realize you are lost, stop right where you are and take stock of the situation. If possible climb the tallest tree around you and look the country over. Without doubt you will observe some famil- iar landmark to guide you. If you decide to walk, break twigs as you go. You can then follow the broken twigs back to where you were if necessary. Fire Your Rifle to Indicate Position If lost, and night comes on, fire your rifle, first two shots, rapid, then one after a little space of time. Listen for answering shots. Keep a fire going and in the day time make a smudge out of it so that the smoke will mount high into the air. Smoke is easily seen in the woods and will be marked for miles in the clear, frosty air. It is a good idea to carry a .22 caliber pistol when hunting in the woods. With it you can kill small game if necessary. A small pocket cooking kit and a waterproof match case are also valuable and can easily be carried in the hunter’s coat. Hunting deer and other big game found in North America is one of the most thrill- ing of outdoor sports within reach of the average man. In big game hunting the hunter is seeking a quarry more his equal in size. The game is swift of foot and very elusive. It is a sport matching the wits of an animal against the intelligence of man. Deer hunting is the most popular of big game sports. Although thousands are killed every year, deer continues to be plentiful. In some states, where alternate hunting sea- sons prevail, the number is increasing. Careless Hunters Increase Hazards As a result deer hunting has become a sport within reach of all. Thousands who have a car and gasoline, go into the woods hunting. Consequently the skilled and care- ful hunter is thrown in with the careless and unpractised person. That acccunts for many accidents due to deer hunting. You can help the sport by observing a few simple rules in the woods. Do not fire carelessly in the direction of any noise you hear. Be sure that you see the deer before you fire, It takes only a fraction of a second before shooting for the eye to take in an area ahead of the gun to be certain that Inventions for December

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no human being is in line of fire. When crawling over fences or other obstructions, be very careful of your gun. Thrust it care- fully ahead of you and keep the muzzle pointing toward the ground, not toward the man who has preceded you. Medium-power rifles, such as the .25-20 and the .32-20 are not recommended for deer. hunting. Better rifles are the .30-40 Krag, the .250-3000 Savage, the .30-06 Spring- field, and of course the common everyday .30-30 so well known to hunters the length and breadth of the land. An open-point, expanding, high-velocity bullet is best for deer and other big game. It has the power and the shock to kill. Hunting is best after a snow fall. When there is a good tracking snow the possi- bility of obtaining a shot is increased many fold. Added to this, the snow deadens the sound of one’s walk over the leaves. E | SPORTSMEN'S Stalking Deer Tests Hunter’s Skill and Cunning When no snow is on the ground the drive method is often used. Certain hunters of the party station themselves at command- ing points while other members of the party drive toward them. Generally the deer will break into the open. The wind being toward ihe hunters posted on guard the deer does not draw scent of them, but does scent the drivers. Naturally they attempt to evade the drivers by running in the opposite direc- tion. This method of driving deer is not highly recommended because there is so much danger of accident. Neither should hunters go out in large parties, because the more men there are in the woods the greater the danger. In the drive method when two or three hunters work together, the hunter on guard, watching for the outcoming deer, is posted at a likely runway down which any deer, (Continued on page 130) ) Beating a trail back to the cabin after a day in the woods is often a ticklish problem for the lone hunter unskilled in woodcraft. 76 In the accompanying text are a number of valuable suggestions to offset the dangers of being lost. Modern Mechanix and Introduced by Spanish colonists as domestic animals more than 300 years ago, the wild boar of Santa Cruz island is today one of America’s most unique and dangerous spe- cies of game. Photo shows hunter with two of the beasts. OMINATING the lonely little island of Santa Cruz, about 20 miles off the coast of Southern California, is one of the most unique species of game to be found within the boundaries of the United States. For Santa Cruz is the home of the Amer- ican wild boar—savage tuskers that are quick to battle man or beast. Weighing up to thrée and four hundred pounds, the island monarchs are savage antagonists with the viciousness and vitality of a wounded grizzly bear. These fighting animals are not native to the island or the neighboring mainland. They were introduced to Santa Cruz fol- lowing the establishment of Spanish col- onies in the channel islands in 1542. Inventions for December The circular insert shows a close- up of the fearsome head of a Santa Cruz boar. Note the vicious tusks, which often reach a length of eight inches or more. Lower photo—Braving a possible charge, a hunter closes in on bis ; quarry, which, when cornered, will fight with extreme viciousness, Since that time, the hogs have degenerat- ed to the same state of viciousness as that of the wild boar of central Europe. They have fearsome heads, high, bristling shoul- ders and knife-like tusks. Elusive in open country, the Santa Cruz boar is hunted with dogs and heavy rifles. TE

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Exploring CALIFORNIA’S Neighborhood children call this house “haunted,” for be- hind its modest exterior lies a wonderland of beautiful interiors and strange devices which work mechanical marvels. ue neighborhood kids call it the “haunt- ed house.” It stands forlornly on the street, its cor- roded brown front and ominously shaded windows dusty and forbidding amidst a splash of fine homes and apartment citadels in one of San Francisco’s exclusive residen- tial districts. It isn’t “haunted,” of course. But behind its door lies mystery, with a hollow-eyed wizard wielding a magic wand. For inside the house there are hand- carved -portals that open at a command, unseen flutes wafting dreamy melodies through the rooms every half hour, an organ that plays on an order from a human voice, a telephone that acts as a messenger and a woman robot that plays 3000 tunes on a zither. The Mystery Mansion’s Talented Master This strange house, unique in California, is the creation of Dr. Cecil Nixon, inventive genius and mental giant who lives on a diet of science. For many years he has toiled with no thought of financial gain, sleeping little and working long hours both day and night. A few years ago Dr. Nixon was listening to an organ concert. “I must have an organ in my house,” he said. But good organs are expensive. Hence Dr. Nixon trudged to the public library, ob- tained all available text books on the art of organ building—-and made one himself! Today the mighty instrument occupies a great part of the Nixon basement and is the marvel of San Francisco’s leading organists 84 by DEAN S. JENNINGS Dr. Nixon, owner of the mystery house, demonstrates one of his illusions—the suspension in mid air of a miniature Taj Mahal. The cord, visible in the picture, has been passed below the model to show that nothing supports it. who declare that its delicate tone is unsur- passed by professional work. Yet Dr. Nixon has gone still further. By installing a num- ber of microphones and an ingenious sys- tem of mechanical control, the organ is made to play at a spoken command. Organ-building, however, is only one phase of Dr. Nixon’s amazing versatility. If he is ill, he treats himself, for he has mas- tered medicine, has a thorough knowledge of pharmacy and compounds his own pre- scriptions. If he has a toothache, he goes to his own office, for he is a graduate of dentistry. If the house needs wiring, Dr. Nixon is a qualified electrician. If the house requires alterations, his com- plete knowledge of architecture and build- ing construction comes to the fore. Rooms and the hallway on the ground floor are of museum beauty, sometimes somber, yet cathedral-like in tone. Walls and ceilings are rare woods, hand-carved by Dr. Nixon with excruciating detail. The Modern Mechanix and MANSION of MYSTERY Guarded by weird figures, doors open and a mighty organ plays on command in a house of mystery presided over by a brilliant scientist and a beautiful, life- like robot princess of ancient Egypt. doors, exquisite portraits of wood design entirely hand-made, would excite a connois- ' seur. Dr. Nixon has applied sculptural ability to the fashioning of gargoyle heads in several rooms and a reproduction in bronze of a Parthenon frieze. Even the floors are inlaid in a delicate pattern. Some of the gargoyles have discs con- cealed in their mouths. The voice, acting on a platinum point which in turn controls a gear arrangement under the floor, will open and close the doors in mystifying manner. Even the telephone is unusual. When the bell rings, the clapper releases a miniature mouse trap and completes an electrical circuit that sounds buzzers in dis- tant rooms. The flute music, welling through the rooms at half hour intervals, is Dr. Nixon’s most recent accomplishment. “The mechanism is simple enough,” he explains. “I took an ordinary watch, re- (Continued on page 118) Upper photo shows one of the gargoyles carved by Dr. Nixon upon his doors. the door at sound of a human voice. upon the zither at a spoken command, plucking out each note with an individual stroke of the metal picks in her hands A disc in the gargoyle’s mouth opens Lower photo—Isis, queen of the mystery mansion, who plays three thousand tunes Inventions for December 85

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Talk on 5 METER WAVES Hold phone conversations with friends on lakes, at camp, or in the city, as far as ten miles away, with this compact but powerful ultra-short wave combined transmitter and receiver. QNY a few years ago radio transmission on the five meter band was a rare thing. Today ultra-short wave sets are giving hundreds of fans a chance to operate their own transmitters and enjoy the thrills of amateur radio without putting out hun- dreds of dollars for equipment. Designed especially for MopERN MECH- ANIX AND INVENTIONS readers, this 5-meter ©. COIL: MTG. Lay out and drill 1⁄4” thick aluminum panel as shown above. All parts are mounted directly on this panel or set off from it with brackets and studs. Audio transformer mounts on two studs, condenser insulating panel on two, coil on one. At right: Use of fiber washers as insulators. | ANTENNA POST 10,000 OHMS J 100,000 OHMS baal combination transmitter and receiver can be built from standard parts for about $5. Many fans will be able to salvage parts from old battery receivers. The tubes, batteries, headphone set, and carbon microphone complete the setup. Actually we have here a private telephone system, with a range up to ten miles. With one set at home or camp, and another mounted for portable use, telephonic con- versations can be carried on from your car, boat, or even while hiking. For portable use the set may be mounted in a metal tool box or overnight bag. Special small batteries should then be used to cut down weight. The transmitter-receiver is mounted en- tirely on an aluminum panel 5%” x 5”, which also serves as chassis and ground. No ground wire is used. The arrangement of parts is novel, but radio experimenters will recognize the transmitting unit as a split Colpitts circuit modulated by a ’33 pentode. With the switch thrown for receiving, the ’33 tube be- comes a stage of audio fre- quency and the transmitter a receiver operating very much like a super-regenera- tive set. TUNING CONDENSER FOROR BEJI 100,000 OHMS 300 TURNS # 326.7] WOUND OVER SEC. OF AUDIO TRANSE. A MICROPHONE +A > 3VOLTS GROUND TO PANEL 99 Circuit diagram of M-M Transceiver. Remove laminations of standard audio trans- former, wind on extra turns for microphone input as indicated, then re-pack laminations. Details of coupling coils and transmitter tester are shown at right. Modern Mechanix and with MMM TRANSMITTER Microphone and audio transformers have been. combined to save space by winding between 250 and 300 turns of No. 32 enam- eled copper. wire over the secondary wind- ing of an ordinary audio frequency trans- former. If desired, a manufactured trans- former serving exactly the same purpose can be had for around one dollar. The transformer and tube sockets are mounted on metal or fiber studs to eliminate body capacity. The small tuning condenser is mounted on a strip of bakelite which in turn is held away from the panel by studs. This condenser should be no larger than 20 mmf. (.00002) in order that the set will tune down low enough; this size generally will have seven plates. Sockets are of the wafer type, mounted as shown, with the coils located between. The coils are wound with No. 14 or No. 12 plain or enameled copper wire. Both. coils have 5 turns wound on a 14” dowel or pipe form. When removed from the form the coils will open slightly, giving the cor- rect finished inside diameter of about %”. Spread out the windings to leave about 1%” space between each turn. (Continued on page 122) by THOMAS A. BLANCHARD A ID Batteries, phones, microphone are easily connected to transceiver if above scheme is followed, Use any single button carbon hand microphone having a built-in switch. ~ EARPHONES WIND 300 TURNS OF #32 ENAM. WIRE OVER SECONDARY 4 OF AUDIO TRANSFOR- MER FOR MICROPHONE M WINDING, C s, 7 = INDICATES Perspective diagram shows location INDICATE and wiring of all transceiver parts. CONNECTION To Connect A-, B— leads to panel at PANEL, any point. Upper microphone bind- ing post is not insulated from panel. Inventions for December 9}

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rain eee FOOTBALL HM FINO spunog Jo mona esed WPN sunjagy FIA puesseg pa3zdacsaquy on ouw Egos ot o yy 020042.0 70020 Oe bua o S ki a lz! o 9 1 7 o -10 1 6 D 9 1 20 w a R Aan ZN S bal hanab e E] u AMWOUWONRO [e DZMOZOZOZA Sr hens a exadoookes 40" a 2a Playing charts can be cut out and pasted on stiff cardboard. 96 by J. R. JOHNSTON Every play of football is possible with this thrilling new gameboard, Plays are called, dice thrown, results read off from charts, and the football moved as chart indicates. HIS football game has been so simplified that even a ten year old boy can play it. In spite of its simplicity, however, every standard play of a real football game is pro- vided, from straight line plunges and end runs to tricky lateral and forward passes. In perfecting the game, statistics of every standard play in 100 college games were studied and averaged, to form a basis for determining gains or losses. Because of this, we believe the game conforms more close- ly to actual football than any other on the market. So accurate are the play charts that it is possible to kick a 55-yard field goal, close to the record for the longest goal ever made from the field. It is possible to complete a long pass for a gain of 56 yards, also close to the record. Likewise, a pass into the end zone can be completed for a touchdown, or intercepted and run back 50, 77 or 100 yards, the latter resulting in a touchdown. Thrills and “breaks” are just as prominent as in any real game. The game costs practically nothing to make, and takes little space. It consists of a 26’x15” miniature gridiron, two charts of plays, a football, downs markers, and a pair of dice. The charts are cut out and pasted on cards so that each player or “team” has a set of plays and results to call off. Fifteen columns are provided in the charts, two of which are for dice numbers. The 13 remaining columns contain figures Modern Mechanix and WITH “VARSITY JR.” GAME “SQALL NVY=ZLYU “ANIT'GAZ 40 GV3HY SI NVE 41SS07 SI LAA ININ GUVA Z S,LNINOddO OL NVY=TALY | f] f] f} f] i [j y i f) f) [| f) 1 l f] l l l l i I Į f] SYMBOLS USED IN PLAYING “VARSITY JR” FOOTBALL FR—FUMBLE RECOVERED. BlL-BLOCKED. BLOCKED, CAUGHT IN AIR BY OPPOSING TEAM... Layout of gridiron for football game. Spaces between white lines may be further divided into individual yard lines. Grid should be laid out on white paper, painted green where black above, with numerals in red or black, and sheet then pasted down evenly on light plywood. for 16 different plays, with the field goal kicking formation being used for points after touchdowns. «+ With an alarm clock set to mark 5, 10 or 15 minute periods, whichever desired, the game proceeds like an actual football con- test. Choice of goal and kickoff is deter- mined by a throw of the dice, high winning. The dice are of different color, the red in every case showing tenths, the other hun- dredths. Thus, on the kickoff from the 40 (Continued on page 120) CUT FOOTBALL FROM ORANGE PASTEBOARD --DOWNS MARKER AND. DOWNS TALLIES FROM BLUE PASTEBOARD OF _THREE-PLY WEIGHT.. DOWNS MARKER (1 REQUIRED) DOWNS TALLY MARKER Full size patterns for ball and markers are shown above. Downs marker will cover 10 yards on full size game board. Downs tal- lies are moved to proper nu- merals at each side of board to indicate correct number of down. (2 REQUIRED) © Inventions for December re ae 26 INCHES ‘3NMOG =@ “SGNNO@ 40 LNO =O “AL IWNAad —d NIYO Y0 GOOD — 9 “NMOGHINOL HOs NVY—aau TIVGL00F {UP ALISHVA, ONIAVId NI GSSN SIOBWAS 2 yO 15 INCHES SYMBOLS USED IN PLAYING “VARSITY JR” FOOTBALL, C— COMPLETE. N=INCOMPLETE. }— INTERCEPTED. L—LOSS. F- FUMBLE - BALL GOES TO OTHER TEAM. % PLAYS FOR OFFENSE seed əuoz Puy Jud 305 FOI 109 PPA ssəqunyN əza Anuonuwom 20% ze 3 w Sasaanega c N c N N c N cC N N N IRT: N 7L c N N c N c F ie] n MHODCOLOCHHOWUBHACOUD ZOZZW0Z PROS BSS Prononwors a a PEN TERR Bes w h ELELEE 4 wa i FAOHAOAHAAIOHAAA kl ane) bo oF Banas a wZan0 ky & S ge" + oFtaws 18L I-R77 ANOZZOZAAZAyZo onaaaotebrnomuotouw a Call offensive plays from these charts, then throw dice. 97

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MAIN | WIND WITH COPPER SAIL || FOR RUNNER < ae Ss x: x “IRON BLOCK

: SECTION THRU g < TILLER FITTING 7 BEARING WASHER = ee < ae 2 fæ 5n CROSS ARM FOR RUDDER POST CROSS ARM FOR TILLER POST DRILLED FOR 3/4" POST DRILLED FOR 5/8" DIAM. POST DRILL FOR SHACKLE

= kaa] DETAIL OF THE TILLER & TILLER POST FITTING

Rudder post and tiller details. Crossed steering cables are necessary with front-steering runner to permit tiller to move in same direction as operator on turns. Hardwood tiller swings up or down in bearing block, which in tutn bolts to tiller post. Inventions for December 101

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Six Novel SUGGESTIONS FLOWER POT COVER made from small pieces of wood will beautify unsightly clay pots, giv- ing novel setting for any plant. Drill holes in carefully beveled wood strips, assemble with beads and elastic, and apply lacquer or paint. EVERLASTING CANDLE burns for hours eet PAINT TOR, with bright flame, yet always is same height. STRIPS ANOTHER Glue cardboard or tin cylinder 24” long by 4” thick to wood base, set in kerosene tin with wick, and finish in red enamel, ribbon, and white wax. HOLES FOR STRINGING BEADS a 1N oua saag ju “LAY WOODS ONE ON TOP OF OTHER: FASTEN WITH SMALL WIRE ¥- GLUE BANDS ý BI aar r A MAN l AAKALA LARENA | BOOK ENDS with novel inlaid designs are made by nailing thin strips of different colored woods together, sawing out design on jig saw, then interchanging pieces to get multi-colored effects. Finish with clear lacquer, after mounting on wood or metal backboard. 104 Modern Mechanix and for CHRISTMAS GIFTS Add that personal touch to Christmas gifts this year by making them in your own workshop. Among the plans shown = here are appropriate gifts for family EARS ONGUTER or friends—and their cost will be very |isawosg moderate. Finished in gay lacquer, |fquanes they spread real holiday cheer to all. | “SCOTTIE” DOOR STOP is cut from layers of plywood, then glued together and finished with | heavy coat of plastic paint textured to represent fur. WHISK BROOM HOLDER with comic face brings many a chuckle from users. Paint features in with black paint, then add dashes of color to mouth, nose, and ears. Hang by screw eye on nail in wall. TOY CART teaches little children to make rounds of house, picking up toys at end of day. Plywood overlays in animal designs are glued to sides of cart, then painted. Wheels are turned from pine or hardwood, then fitted with bushings. Assemble with wood screws. F SQUARES PATTERN i nE PAINT RABBIT, PANEL AND BOX DIFFER = ENT COLORS Inventions for December 105

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SOUND EFFECT Gadgets HIS equipment which to the layman may appear to be the invention of a unatic is used regularly on the professional stage to obtain unusual sound effects. Con- tinued use, however, has demonstrated how hese weird devices can add realism to the average stage play. Little theater groups should have these easily-made noisemakers among their stage equipment, for there is hardly a play writ- en which does not call for the use of some of them. The thunder sheet, Fig. 1, is shaken to produce the deep roll of thunder. It is made rom a sheet of flexible copper or tin, both ends of which are held firmly with light wooden battens. One end is suspended overhead by ropes. A handle of wood or loop of rope makes it easier to operate. For a loud clap of thunder, fire a blank shotgun shell into an empty barrel, or suspend a log chain by means of rope and -pulley over an empty barrel across which is laid a sheet of galvanized iron. At the “cue” release the rope. The sound is deaf- ening. 110 DAVID A. Bizarre though they may seem, the devices described in this article with a little practice can be made to pro- duce any off-stage sound effect for amateur theatricals, Pictured below are devices used for producing back-stage thun- der, chimes or fire bells, click- ing of train wheels passing over rails, or sound of marching men. Modern Mechanix oO “THEATER” for the “Little Fig. 5 shows how door bell clap- per strikes two gongs as in teles phone. Rocks placed. at top of box in Fig. 6 break glass below when latch is released by pull. To make a set of chimes, sus- pend a brass pipe in a barrel of water. Raise and lower the pipe while tapping it with a hammer until the desired pitch is sound- ed. The water line is the point at which the pipe should be sawed. In this way several pipes may be suspended from a rack by rope, and tuned to form chimes, church, train or fire department bells. For loud ringing use a ham- mer, for softer tones a striker padded and covered with chamois. For the sound of train wheels passing over rails use a truck, Fig. 3, mounted on steel casters, revolving on a base covered with corrugated iron roofing. The truck is 214’ square, the base 4’ square. Cut a hole in the center of the roofing and screw a floor flange pipe socket to the base. Into this screw a section of pipe for the truck to revolve around. Merely cut a hole in the truck to fit the pipe and fasten a conven- ient handle at one corner for operating the truck. As a train approaches, first sound a wooden train whistle and ring the bells. Come in with the steam exhaust by lightly (Continued on page 132) YT Whir and roar of stunting airplane is realistically reproduced by hold- BERRY. Noise of escaping steam is made ing newspaper against electric fan. CRATES tied by opening compressed air valve. a Breaking berry crates provides crackling of flames for fires. Inventions for December 111

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FOR INVENTORS And Mechanical Minded Men t 1 c (Ce Answers o Questions on Page 20 For protection. A patent gives the inventor title for 17 years. Dr. Elihu Thompson (over 700 Patents). Dr. Miller Reese Hutch- inson (approximately 1000 pat- ents). Thomas A. Edison (1101 U. S. — 1279 Foreign). (1) Goodycar. (2) Nobel. (3) Sin- felder. (4) Roentgen. The U. S. Patent Office has said in this connection that “the prepara- tion of an application is a highly complex proceeding and generally cannot be conducted properly ex- cept by an attorney trained in this specialized practice.” im Go N mi A partial list of some inventions and discoveries is available by writing for my booklet. Space here is too limited. It is generally advisable to ap- proach a manufacturer only when application covering the invention is on file in U. S. Patent Office. Attorney’s fees can be paid in in- stallments. No; having a patent attorney at Washington can save expense and time. The first adding machine. Quantity production of Industry. He built the first machinery for standardizing the parts and manu- facture of government muskets in the War of 1812. LARENCE A. O’BRIEN Registered Patent Attorney 317-P Adams Building Washington, D. C. ~pyright Clarence A. O’Brien) SCS Bt 2 n Small Ideas May Have Large Commercial Possibilities If -you hope to realize profits from your invention, you must protect it with a United States Government Patent, Otherwise you may find that all your time and -Jébor have been lost, because it often hap- pens that other inventors are work- ing on the same idea. If you have an idea, take steps to get a patent „at once ! ARAN MEE eer tt THE Free Book shown here was pre- pared for inventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for this book AT ONCE. It will tell you exactly how an application for a Patent is made, what infor- mation you must furnish your attorney, and what steps he must take in order to protect your interests. Remember, inventing an article is one thing—secur- ing the exclusive right to manufacture it, use it or sell it is another. Without a U. S. Patent, you cannot expect to reap the profits that your invention may make possible. Send at once for this book. After you get that, you’ll know exactly what to do to protect yourself. Thank You for Mentioning Modern Mechanix and Inventions for December When Writing to Advertisers PATENT Make a rough pen- cil sketch of your invention, describe tt fully, and send it to me for prelimi- aary search through U. S. Patent Office —tee $5.00. YOU CAN PATENT New Ideas for Improvements in Machinery, Articles, Designs, Formulas, Ete. VERY year thousands of Pat- ents are granted. Very few, however, represent the discovery of entirely new principles. Most of them provide new methods of doing some every-day thing in a better way—changes for greater efficiency, usefulness, adaptability, or beauty in some previously Patented thing. These IMPROVEMENTS are Patentable if new, and actually represent new invention. These Im- provement Patents offer large chances for profit if commercially useful, The business world wants improved products and services. THE FIRST IMPORTANT STEP IN SECURING A PATENT 4s to obtain the services of a Registered Patent Attorney, Establish the date of your invention as explained in My Book and disclose your idea to him in correct form, He then makes a SHARCH of the Patent Office Records and reports to you on existing U. S. Patents which might bear on your invention, giving his opinion on the advisability of proceeding and filing formal application. How this Inexpensive step can save you money, time and delay when Putenting your idea—how it tells you whether or not it is worth your while to file formal Application—all is explained in My Big Book- SEND FOR IT TODAY. If you have developed sothe improvement, something which adds to the usefulness of any product—whether this product is Seno For This FREE STEP NO. 2 My trained search- ers will then make a preliminary search of the pertinent U. S. Patents to deter- mine if your inven- tion is probably pat- entable. STEP NO. 3 My complete report of search and ion on patentability will bo mailed to you with copies of U. S. Patents that I consider nearest to your invention. Patented or not—you should pro- tect your improvement with a Patent at once, Send for My Big Book which tells you how. Reasonable Fees— Convenient Terms Don't worry about finances. My fees are very reason- able—f can arrange convenient terms of payment. It is my custom to permit clients to pay for my services in installments as the application progresses in my office. See My Big Book for fees inobtaining Patent. It explains my arrangements clearly. SEND’ FOR IT NOW. STEP NO. 4 If you decide to make patent appli- cation, for customary fees explained in my booklet, my drafts- men will make draw- ings and proper pa~ pers will be pre- pared for presenta- ALSO FREE RECORD OF : INVENTION BLANK Hon Yo “the Patent ‘Thls FREE Record of Invention Form enables you Examiner, : to make in convenient furm a sketch of your idca i and have it witnessed in a manner CLARENCE A. O'BRIEN of value to you should the occasion for evidence arise. MATL THIS COUPON TODAY and ob- REGISTERED PATENT ATTORNEY ADAMS BUILDING SHINGTON, D.C. tain my FREE BOOK and Record of In- vention Form, Please send me your FREE BOOK, “How to Obtain a Patent,” and your “Record of Invention” Form, without any cost or obligation on my part. ADDRESS (Important: Write or print name plainly) Thank You for Mentioning Modern Mechanix and I nventions for December When Writing to Advertisers 147

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