Modern Mechanix, May 1934

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MODERN MECHANIX NOW AND INVENTIONS

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| Hundreds Have Already Won Big Cash Rewards NOW—100 MORE Cash Prizes Being Given? ANYBODY May Win or Buick Sedan & $1,000.00? De YOU want money? —a small fortune? — $2,500.00 in real Cash? Here’s your oppor- tunity! And not one cent of your money is required now or ever to win it. This is our sensational new way to advertise. We want people everywhere talk- ing about our company quick. So we are giving away thousands of Dollars — real fortunes — 100 cash prizes totaling over $5,000.00 — besides thousands of dollars in Extra cash rewards. Every- body can share in these cash rewards. Wouldn’t you, too, like to win a brand new Buick Sedan and $1,000.00 (or $2,500.00 all cash)? Can YOU Find 4 Dogs im Picture at Right? Some are upside down, Some sidewise. Can you find 4 dogs? Mark the dogs you find, clip picture and mail quick. Hundreds of people have won thousands of dollars in cash rewards in other advertising campaigns con- ducted by men in this big company. Above area few. Now comes your chance. Maybe this great opportunity sounds like a dream to you, but I’ll be happy to send you the $2,500 or Buick and $1,000.00 the minute youwin it. ~ “Not a Penny of Your Money Needed Ail these prizes are being given outright to wine ners. Not a penny of your money needed to buy anything. Not alottery. No luck orskillneeded. Nothing to write. Imagine the joy of receiving a letter from me with $2,500.00 in it! Oh, boy, what a thrill! Hurry — get started quick by finding 4 dogs. Nothing for you to lose. You Are SURE to Win a Cash Reward if You Do as I Ask You are absolutely GUARANTEED to win a cash reward if you take an active part. .But hurry! . First active, first rewarded! Think of all the happiness $2,500.00 can bring you! We are reliable! I invite you te look us up through any credit agency, any bank in Des Moines, any business house, railroad, express company, maga- zine, newspaper. .. . We are well known national advertisers. wW ill 7 $10, g TOT TD) s g 2y wori prove that we do not really give away all these thousands of dollars in prizes or that all this prize money is not in the $3700% 1. NYSTROM-ORE, Would YOU 100, Like to | i i 2 ~ / d bank waiting to promptly pay ev- ery prize winher— or that we willnot fulfill every guar- antee we make. We are a big, re- sponsible frm, $1,000.00 EXTR FOR PROMPTNESS I will pay First Grand Prize winner $1,000.00 extra just for promptness—~a Buick and $1,000.00 (or $2,500.00 if all cash is preferred). Do you want it?) Then hurry. ‘Not only one person, but hundreds will win cash rewards. In case of ties duplicate prizes will be given. MAIL COUPON QUICK Just mark the dogs you find, clip picture and mail quick with coupon below-—~ or write on a penny post-card how many dogs you find. Don’t send a cent. For replying I will tell you how you may share in thousands of dollars in EXTRA cash rewards and win $2,500.00, too. An- swer today. NEBR EERE Ree Tell me WMerrold Johnson, Prize Manager, which you WDept. 233, Des Moines, Lowa. desire to 1 have found 4 hunting dogs in your picture and I win=$2,500 ee anxious to win, NOW IN BANK All the thousands of dollars to pay every prize winner is now in the big, strong Bankers Trust Co. bank in Des Moines. i all cash or gy Buick and Wiima painin i nO Masia $1,000.00? m Merrold BAddress, cosssssecsusessccssnssencousceeerssanese Johnson, E Prize Mgr, Hicity,..., PR coe aane State..... ie t : Dept. 233, W (Mark in square which you would prefer to win.) Des Moines HM Q Buick and $1,000.00. or (] $2,500.00 All Cash, Iowa (ag ee eee eee)

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Service Manager Earns $200 Month “As Radio Service Man- ager for Sterchi’s four Nashville Stores, my earn- ings are around $200 a month. My N.R.I. train-_ ing enables me to keep our customers satisfied.’”’ E. H. LEFTWICH, Sterchi Bros. Stores, Inc., Nashville, Tenn. $120 a Month in Spare Time “I'm servicing from 3 to 5 sets daily in spare time, and average $120 a month from my Radio work. still hold my regular day Pe I ove my success to A, E. FARMER, 1012 Denison St.. Muskogee, Okla. Owes a Lot to “After nishing my tenth lesson, I started on my first job. After that, joba came rolling in and I found myself with d sur- plus of money with which to conlinue paying for my Course. My first year’s tecord was 108-Radia jobs. I have cleared $2,305 to date in spare time.’’ JOHN HEARL, 66-53 Jary Ave., Maspeth, L. I.. N. Y. ogy Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers Wey en rage will Train You at F xin your spare time’ Get away from disagreeable jobs with no future. From skinny, litlle pay envelopes. From skimping along, just barely gelting by, but not getting ahead. DON’T PUT UP WITH THEM ANY LONGER. Get into o field with a future. Act today to Dut yourself ahead. Mail the coupon for my free 64-page book that tells how you can train at home in your spare time to be a Radio Expert; about my Course that doubles and triples the pay of many who take lt. MAIL THAT COUPON NOW and take the first step toward a real future. Real Opportunities Ahead in Radio for Trained Men It’s hard to find a field with more opportunity awaiting the trained man. Why in 1932—the worst year of the depression—the Radio Industry sold $200,000,000 worth of sets and parts! Manufacturers alone employed nearly 100,000 people! About 300,000 people worked in the industry, 1932 broadcasting revenue was the blggest in history. It’s a giganlic business, even in the worst business years! And look what’s ahead! Millions of sets becoming obsolete annually. 17,000,000 sets in operation that need servicing from time to time! Over 600 great broadcasting statlons furnishing entertainment and news to 100,000,000 People. These Ggures are so big that they are hard to grasp! Yet, they are all true! Here is a new industry that has grown into a commercial giant. No wonder great business leaders predict a brilliant future for this great and growing business. Get Into This Field With a Future There's opportunity for you in Radio. Its future is cer- tain. Television, short wave, police. Radio, automobile Radio, loud speaker systems, aircraft Radio—in every branch, derelopments and improvements are taking place. Here is a real future for thousands and thousands of men who really know Radio. Get the training that opens the road to good pay, and success! Send me the coupon now, and get full particulars on how easy and interesting I make learning at home. Read the letters from graduates who are today earning real money in this fascinating industry. Many Make $5, $10, $15 a Week Extra in Spare Time Almost at Once My book also tells how many of my students made $5, $10, $15 a week extra in spare time, soon after they enrolled. I give you plans and ideas that have made good spare time money—$200 to $1,000 a year—for hundreds of fellows. My Cuurse is famous as “ihe one that pays for itself.” Money Back if Not Satisfied I nm so sure that N.R.I. can train you satisfactorily that I will agree in writing to refund every penny of your tuitlon if you are not satisfied with my Lessons and Instruction Service upon completion. You'll get a copy of this Agreement with my book. 64-page Book of Information Free Get your copy today. It’s free to any ambitious fellow over 15 years old. It tells you about Radlo’s spare time and full time job opportunities; it tells you all about my Course; what others who have taken it are. doing and making. Find out what Radio offers YOU without the slightest obligation, Mail the coupon now in an envelope, or paste it on @ Je postcard. J. E. SMITH, President National Radio Institute, Dept. 4EH Washington, D. C. Free Book Tells How Mail Card oe SPECIAL Radio Equipment - for Broad Practical Experience Given Without Extra Charge My Course ls not all theory. I'll show you how to use my special Radio equipment for conducting experi- ments and building circuits which illustrate important principles used in such well-knowg sets as Westinghouse. General Elec- tric, Philco, R. C. A., Victor, Ma- jestic and others. You work out with your own hands many of the things you read in our lesson books. This 50-50 method of train- ing makes learning at home easy, interesting, fascinat- ing, intensely practical. TN SAMPLE LESSON FREE Take adrantage of this offer. Mail the coupon RIGHT NOW, and I’ll send you FREE a Sample Lesson that only my students have received in the past. This Fascinuting book, “A Bird’s-Eye View of Radio,’’ is just packed and jammed with information about this growing industry. The reason I am willing to send it to you is to PROVE that my Course is simple, easy to understand, and enjoyable to study. I want to SHOW YOU that I can train you, just as I have ALREADY trained thousands of men, Many of them with not even a grammar school education, and no Radio or technical experience, have become Radio ex- [have doubled fro or tiroe times and tripled the m:n tne couor salaries of many.{ ,_ Now. Find out about / this tested FILL OUTAND MA ~ THIS COUPON: J. E. SMITH, President National Radio Institute, Dept. 4EH Washington, D. C. I want to lake advantage of your special offer. Send your free book “Rich Rewards in Radio’ and a free sample lesson. ‘This does not obli- gate me. é Jno eae eeeoce soe cmunt

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PRICE 15 CENTS (20 CENTS IN CANADA) Volume XII M 1 Number | A Y 934 errO Ga SPECIAL FEATURES SHORTER FEATURES Will the Washington Monument Crash? 34 Problem Lettere Erom Readers: 18 By James Nevin Miller Movie Expedition Films Fierce Death Battles in Jungles - 43 Seek Lost Gold City Under Los Angeles - 37 o Player Beats- 53 Crashing Airplanes for the Movies - 38 Build Violins Before Learning PI - - - 56 By James Bowles ee, Robot Manicurist Among New Home Aids - - - - 58 Learn to Play Baseball From Big : ‘ $25 in Prizes for Geometry League Stars - Š : z = - M Problem - - - - - 66 B hn C. H y John offmar Realistic Air Bombing Taught i tals : Indoors - - - - - 67 All-Metal Dirigible Will Outrun Storms - 47 Science to Rob Earthquakes of Terror - = - + = 69 Oddities of Science - - - - - 48 200,000 Reindeer Roam Alas- By Nic Sprank kan Ranch - - - .- 75 z 2 Big Profits in Back Yard Frog Daring Rocket Men to Invade Raising - - - >- - 87 Stratosphere E z - . fs - 50 Fortunes Await Inventors - 88. By Alfred Albelli cans 7 Train Your Hunting Dog for s z 5 Field Work Now - - - 97 Death Rides Rumble Seat of Oil Bomber 54 e a OE Tafod Photography - - - 106 Army Filote:Seorn Danger to'Fly Mail - 60 Entertain With Pseudo-Occult Magic Tricks - - -110 Study Clouds to Forecast Weather - - 62 With the Collectors - - - 114 By Dr. W. J. Humphreys New Novelty Inventions - - 146 Gadgets Net Edison Disciple $3,000,000 65 HOW-TO-BUILD FEATURES What’s Wrong With Uncle Sam’s Navy? - 70 A Pocketknife Model of a Coal By Lieut. John Edwin Hogg, U.S.N.R. Freighter - -= = = 93 Light T for C - 94 Bodyguards Face Death to End Kidnap ne " By Robert Page. Pincoln Menace - - = =- =- = 80 How to Restring Your Own Tennis Racquet - - - 100 By William E. Maher - 84 Novel Back Yard Bird Houses 103 By Harry Bernstein Timely Tips for. Tuning Up Your Car This Spring - - - - = i By F. H. Monson Build a Suspension Trailer for Your Boat - - =- > 104 Sportsmen’s Campfire ~ =- =- «= 94 By Paul W. Gartner By Robert Page Lincoln Breakfast Cabinet for the Cot- Hunting and Fishing Editor tage = =- = + + -112 (Contents continued on page 6)

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Prepare Quickly at Home in Spare Time Good Pay Job IN THE Fast-Growing < AVIATION INDUSTRY My famous course trains you right in in their early thirties, or even younger. It is a : Hi just a f young man’s industry, which means that there your own home—gets you ready for one af. the “may welk are plenty of opportunities to forge ahead. But of the good ground jobs—or cuts many paid jobs in the fast just because it is run by young men, don’t get weeks and many dollars from flight in- growing Aviation the idea that Aviation is a small business. Mil-

WALTER HINTON: trail blazer, pioneer, ex- plorer, author, instructor, AVIATOR. The first man to pilot a plane across the Atlantic, the famous NC-4, and the first to fly from North to South America. The man who was a crack flying instructor for the Navy during the War; who today is training far-sighted men for Aviation. Hinton is ready to train you at home in your spare time. Get his book.

, * : lions are being spent yearly to develop and im- structions, Send for my big free book mdustey prove airways and planes. Thousands of men today. ON THE GROUND earn good livings from the busines And many. "t si Ai i 5 many thousands will enter it in the future. It is Don t sit back and envy the men who irponi SU rene a great and growing industry, this Aviation, an are in the midst of the romance, adven- inste auton Specialist industry that still brings romance, excitement, ture and fascination of Aviation. YOU | Shy i2man eo dep O RE ee aun aa X : iz Hangar Crew Chief i Í DON’T HAVE TO. For right in your | Hanga S own home, in your spare time, I’ll give | Purchasing Agent I Have Helped Secure Jobs for you the training you need to get start- | Aerial Mail Clerk ‘ A 6 9 & Motor Expert Many of My Graduates ed in this growing, well-paid industry. Radio Operator : ets 5 È 2 P y Airplane Mechanic Due to my widespread connections with avia- Get my free book. It tells ail the facts. | fisd Wom tors, plane manufacturers, airport managers, Many Make $40, $60, $75 a Week INTHE AIR | Ceste jobs for trained men. My Aviation friends Through the amazingly simple method I have Air Express Agent know that Hinton-trained men are well qualified worked out, I can train you at home to fill Air Mail Pilot to fill any job for which I recommend them.’ many Tepai jobs in Aviation. Naturally, be- Aerial Pro ogranny ore you can fly, you have to take additional iu- + E a Ta e a e a eee 5 - gen i im . uate from my course you have the necessary Private Piloting a humdrum job with no future. Act now—to foundation to fill any one of the many interest- | Weather Observer get yourself into Aviation—the industry that is ing, well-paid ground jobs. Many of my grad- Flight: sneer: slated to grow into a giant business in the uates quickly get into jobs paying $40, $60 to Field. Manager! next few years. | $75 a week. Others, with the additional low Transport Pilot Get into Aviation. eile cote oe ee I er range for, become Study at home in PREE ae r a month or better. your spare time “Give her. the gun! for a well-paid job with a real You're off! Yes sires, as . " i ou complete m; Aviation Is Growing Fast future, Mail the coupon for my f course, 1 arrange a. free 9 wits = z x . flight for you at an accred- ow eee now—when you are still getting in on Walter Hinton, Pres. ited air field. It doesn’t cost e groun: oor of a new industry—when you have a Aviati I 2 you a penny. It is my chance to forge ahead without having to displace lots of Se perce graduation present to you. older men. Aviation is a young man’s industry, where young Washington, D. C.

men earn real money. The President of the biggest air line in the World is only 35 years old. Most famous pilots are

| se i These Men Made Good With My : a I Mr. Walter Hinton, President 822-R a $75 a Week as Instructor Aviation Institute of U.S. A,, Inc. I $ a ` 1115 Connecticut Avenue, Washington, D. C. f Robt. N. Dobbins, a Hinton graduate, writes : Please .send me a Free copy of your @ I cannot thank you enough for the assistance book, “Wings of Opportunity,” telling yon pae me Erne A Dee ne poni all about my opportunities in Aviation, E ion. Last week they promoted me to Chie i i 5 Instructor, at a big salary increase.” ery ou willitrain me at home for ausa a a Now District Traffic Agent Neme eres (oactaeaion a a heni finished, your course I became il connected wit! -A.T. and am happy to state that promotion has come very rapid- Address atr E Agerre B ly. I shall always be grateful for your inter- est and cooperation.” C. E. McCollum, District Traffic Agent, T.A.T.—Maddux Air Lines. Citaat eaea ARS SALES EA SA A EA S E ED EI E E E E E

age- Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 5

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TABLE OF CONTENTS Continued From Page 4 NEW MECHANICAL INVENTIONS | Raft Driven by Outboard Motor - - - 66

Display Dinners Made of Wax - - - 68 Giant Mystery Plane to Span Atlantic - - 36 | Movies Feature Television Programs - - 73 Circular Slide Rule Fits in Pocket - - - 36 | Charwoman Seeks Jobs Via Motorcycle - 74 Flapping “Air Oar” Propels Sailboat - - 41 | Skyscrapers Cooled by Steam - - - 74 New Pen Counts Words Written - - 41 | Glasses Magnify Eighteen Times - - - 76 Stabilizer Stops Auto Crash After Blowout - 42 | Miniature Boat Racing Popular - + + 76 Jig Saw Operates With Foot - - - 46 | Golf Pro Lives in Auto Trailer - + + 77 Many Wall Plugs Fic in One Outlet - 46 | Sea Gull Lunches at Office - - - 78 Dog Houses Now Made of Steel - 49 | Human Targets Dodge Air Bombs - - - 79 Police Get Calls on Midget Belt Radio - - 52 | Ride Free on This R.R. - - = 82 Level Measures Slopes and Angles - - - .52 | Rangers Find Story Without Words - - 83 Merry-go-Round, Teeter Combined - - - 55 | Miniature Machine Makes Paper - - - 86 Miser Eon Pump - | - + + 57 | Flashlight Used as Field Phone - - 86 ew Lamp Bulb Has No Filaments - - - 57 Among the New Home Aids FOR RADIO FANS ` Washer, Wringer and Ironer Combined - 58 Motor Driven Manicure Machine - - 58 | New Crystal Radio Is Powerful Son 39 Initials Are Ironed Onto Material - - 58 | All-Wave Radio Has But One Tube © + 64 Luncheon Trays for Motorists - - - 59 | Repairing Tubes Nets Big Income - -= 76 Bike Gearshift Eases Hill Climbs - ..59 | Direction Finder for Air Novices - - - 86 Model Liner Driven by Paddle Belts - 61. | Simple Six-volt Battery Charger - + - 89 Hammer Tool Flares Tubing - - . 61 | Ninety-volt B Battery Eliminator - - - 89 Auto Device Changes Oil to Gas - `- 64 | Code ` Recorder Uses Paper Tape - - - 90 Invention Catches Slug Passers - -64 | All-Wave Radio Fits Clock Case < 2A Red Hand Signal Directs: Traffic 68 | New Ideas for Radio Experimenters 92 Powered Ax Chops Farmer’s Wood - + 73 HANDIKINKS FOR EVERYBODY

Rides Golf Course in Silent Car - Bead, 6 68 Italian Perfects Smallest Tractor - .- 73 | Home and Garden Money-savers Lawn. Sprinkler Covers Square - + 74| ` Barrel Makes Engine Muffler - - = 99 Wrench Fits Many Sizes of Nuts = a 16 Broken Glass Thwarts Gophers - - - 99 Home-made Thresher: Costs $50 ag sis VAZ Flower Box Hides Garden Gate - - - 99 Electricity Heats Poultry Fountains - + 77 Handy Tool Repairs Shingle Roofs - - 99 European Car Shows Streamlined Trends - 78 Lightning Rod Protects Trees - - - 99 Wing May Be New Air Flivver - - - 78 | New Kinks for the Home New Mouse Trap Is All Metal - - - 79 Bookcase Made From Bricks - - - ~- 102 Zipper Gas Mask Made for Babies - - 79 Telephone Lock a - - + + 102 Timing Clock Controlled from Field - - .82 Scrub Brush Cleans Stovepipés - - -102 Hot Air Used to Expel Grease - - - - 82 Blank Cartridges.Clean Chimney - - - 102 Cavalry Adopts New Machine Gun - - - 83 Time-saving Devices for the Shop Tiny Air Compressor for Aquarium - - 83 Glass Jars Save Shelf Space - - 108 New Accessories for Rod and Gun: -. 96 Cutting Cardboard on the Bandsaw - : 108 Using Short Drills in Chuck - - - - 108 INTERESTING SCIENTIFIC ITEMS Hanner Made From Water Faucet - + 108 “Overland: Jack” Lives in Wagon - 36 | New Ideas for Everybody Explorer, Wife Uses Tandem Bike - + 36 Typewriter Tray Catches Grit - - ~- 113 Tides Used to Move Boston Bridge - - - 42 Hotel Rooms Sold From Photos - - - N3 Kittens Frolic About Catnip B Block - = + 42 Testing Bad Eggs in Water - - - - 113 ee ae From Plywood Sheets - - 46 Tin Cans for Pigeon Homes - - H3 Ship Models From Straw Hats - = 46 “Electric Eyes” Replace Prison Guards - - 49 FOR THE WORKSHOP FAN Handwriting of Twins Can Be Same - - 52 | Chips From the EDITOR’S WORKBENCH - 12 “Heavy Water” Intoxicates Mouse - - - 52 | Handy Ideas for Motorists - - =- 98 Seoop Power From Sea With Shovels - - 55 | A Connecting Rod Bench Lathe - - - 107 Camera Nearly as Large as Man - - + 55 | Replacing Small Motor Bearings - - - 107 Eyes Magnify Objects 100 Times - - - 59 | New Uses for Old Bottles - - - - 107 Cabooses Make College Dormitories - - 61 | Making 110-vole A.C. Motor From Skull X-Rays to Replace Fingerprints - - 64 Model. T Generator - - - -109 Wax Plane Wings for More Speed - - - 64 | New Uses for Old Auto Generators - - -109 William J. Kostka L. B. Robbins Editor Published monthly by Modern Mechanix Publishing Co., Nationally Known Radlo 529 So. 7th St., Minneapolis, ee j USA Entered Expert A as Second Class matter Sept. 20th, 1928, at Minneapolis, Alfred Albelli Minn. Copyright 1934, dvertising offices Chicago, 919 5 a S Pabl ay New York Editor N. Michigan Ave.; New York, 52 Wanderbilt Ave. penplane Designer Naval Architect 15 cents & copy; $1.50 a year in ’U. S. and Possessions. . i Robert Page Lincoln In Canaďa, 20c a copy; $2.25 a year, Other Pestal Ray F. Kuns Hunting and- Fishing Uniens,, $2.00 a year. Printed in U.S.A. Principal, Cincinnati Auto- Editor motive Trade Schoo?

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NOTE: No other Physi- cal Instruc- tor in the World has ever DARED make such an offer! .... that’s all I need to PROVE | Ican make You,, aNEW MAN! \ Gatley (ills Holder of the title: “The World’s Most Perfectly Developed Man” Won in open competition in the only National and International contests held during the past 15 years NE week! That’s all the time I need. In 7 days I'll give you proof that I can make you over into a new man of «itality and power. T'll do for you exactly what I did for myself. I was once a 97-pound weakling. I was sickly, only half alive. I had a flabby | namby-pamby body. How I changed myself from this “below average”? physique into the man who won— against all comers—the title of ‘‘World’s Most Perfectly Developed Man” is an absorbing story. Tt is told in my book, “Everlasting Health and Strength,” which I will send you absolutely free if you All in and mail the coupon below. It’s Easy MY WAY Big claims mean nothing! That is why I offer you more than promises. That is why I offer you a 7 days’ trial of my famous method, Dynamic-Tension. That lets yot see for yourself that I back up every promise I make. That PROVES beyond a flicker of a doubt that I can and will turn you, too, into a vital, powerful NEW MAN.. Thousands of fellows all over the world have used my method—and now you can, too. Like them, you can put on firm layers of muscle where you need them most, tone up your whole system, banish constipation, poor digestion, bad breath, pimples and other conditions that rob you of the good things and good times of life, and get the ‘‘drive” that'll take you to the top of the ladder, + I’ve Got NO USE for Apparatus à of T haven’t any use for tricky weights or ; springs and machines that may strain your ‘i t CHARLES ATLAS heart and other vital organs. There’s noth- maamble a Stamp today: | 4% Dept. 6-E ing unnatural or artificial about this method may. new book, “Everiag Ing |’ 133 East 23rd Street, of mine. And I don’t dose you or doctor you. Dvynamic-Tension is all I need. It’s the natural, tested method for developing real men inside and out, It dlsiributes added pounds of powerful muscles over your body, gets rid of minor ailments and surplus fat, and gives you the vitality. strength and pep that win you the admira- tion of every woman and lhe respect of any man, Send for YOUR Copy of MY FREE BOOK Don’t be held back by a below-par body! Now you can easily and quickly make thls new man of yourself! Do what my thousands of other pupils did —send for a free copy of my illustrated book, ‘‘Kverlasting Health and Strength.” Learn how T built myself up from a weak, no-muscle, always- AOARESS; ecegcieiierse cians Spierua Seta eale Shad eies PERRE TRAN tired ‘‘runt’’ to winner of the title, ‘‘The World’s Most Perfectly Devel- oned Man.’? Gamble a stamp to mail my coupon—to learn how YOU can win the biggest prize in life—a handsome, healthy, husky body. Address GIEY sieges cane EIE E E SEA T Dlie kE CHARLES ATLAS, Dept. 6-E, 133 E. 28rd St., New York, N. Y. | 1 eH TS Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 7 shows you from actual pho- New York, N. Y. tos how | have developed my pupils to my own per- fectly balanced propor- tions. Where shall 1 send your copy? Write your name and address plain on the coupon. Mail It today to me personally.! I want proof that Dynamic-Tension will make a New Man of me—give me a heallhy, husky body and big muscle development. Send free book, ‘Everlasting Health and Strength.”

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New Quick Relief Works Faster — Medical authorities discover new scien- tific facts about cause and relief of pain—new formula stops pain by relax- ation — quickly — safely — scientifically Pe now say that most Head- aches, and other severe pains are caused by (1) Acid Stomach or (2) Nervous Tension. MODERN DOCTORS prefer Hex1n an amazing new scientific formula — because it is alkaline and because it relieves pressure on nerve ends (the cause of pain) by relaxing tense muscles (the cause of this pressure). Users say they are getting relief with unheard-of speed. BECAUSE HEXIN IS ALKALINE, it does not upset the stomach as acid tablets do. No druggy after- effects either. Just light- ning-quick relief. GIVE US A PAIN COMBATANT— mothers asked—that our children can take with safety. Give us a relief for pain and fever that is milder and better adapted to the delicate systems of children than Modern Druggists Prefer HEXiN ordinary tablets—so arahad mdo If strong and so acid*. iç on hand, insist that he arder it. You can buy HEXIN in con- venient tins containing 12 tab- lets and in economical bottles ‘of 50 and 100 tablets. Don’t let your druggist give you any- thing bue HEXIN. Nothing ‘else is “just as good". SO HEXIN—an alkaline formula—was originally developed for children. Its action had to be gentle and safe. What’s mild enough for your child is better for you. But don’t be misled about the effectiveness of Hrex1n for adult use. The action of HEexIn is mild but RELIEF IS IMMEDIATE. IN TRYING TO BREAK UP A COLD, do not add acid* tablets to an already acid stomach, HEXIN relieves colds by striking. at the cause. Most people find that 1 HExIn tablet every hour until 6 or 7 have been taken keeps a cold from starting or greatly relieves one that has started. BUY HEXIN at any modern drug store. Take 2-tablets with water. At once, nerves start to relax. At once, HEXIN starts to com- bat acidity. Before you realize it, you are freed from those two invisible competitors— pain and discomfort. MAKE the only test that counts, Try Hexin yourself at our expense. Mail the coupon now. You'll never know what quick relief is till you try HEXIN. *HeExin is ALKALINE (non-acid), SS eS pS pS SY i HEXIN, INC.,.8 South Michigan Ave., Chicago, Iik i Please mail me a generous fiec sample of HEXIN. MM1534 | Name. si l i eaa a aSOMR Ae a aes ties as I fj Address... ennnecenneeeccneeseens ensceeneeenncnsersmreteneeemererrenenenanenereanman I l Ciya aaea ces Siate -noson oomen l A SE ENED EET ee 8 Thank You jor Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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YOU CAN REPEAT ALMOST EVERY EXPERIENCE IN LIFE —EXCEPT * @ Topay is life. Tomorrow is a hope. Yesterday is a.dream. Nothing is so dead as a day that has passed. Only the trailing clouds of memory remain. One today upon another today—how quickly a decade is built! Youth approaches manhood in high heart, embraces maturity as the period of his conquest, then “remembers with a sigh the days that are no more.” So life goes—like that. NOW is the only oppor- tunity. NOW is the moment of success). NOW men decide—NOW men win or fail. Are you one of the men who are wondering today what will happen to them tomorrow? Then remember this: Jf you take care of today, tomorrow will take care of itself. And one of the most im- portant safeguards you can take is to be certain your ¢raining is modern... that you are adequately equipped to master the problems of 1934. Today, in almost every line of human endeavor, ambitious men are modernizing their training by spare-time study of International Correspondence Schoola Courses. Their action is a guide to you—and NOW is the time to act! Complete information on any subject in which you are interested will be sent without cost or obligation. The coupon is for your convenience, Return it today. INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” BOX 2316-W, SCRANTON, PENNA. * Without cost or obligation, please send me a copy of your booklet, “Who Wins x` and Why,” and full particulars about the subject before which I have marked X: TECHNICAL AND INDUSTRIAL COURSES O Architect U Architectural Draftaman O Building Estimating O Wood Millworking O Contractor and Builder O Structural Draftsman O Structural Engineer D Inventing and Patenting O Electrical Engineer O Electric Lighting O Welding, Electric and Gag O Reading Shop Blueprints Business Management O Office Management O Industrial Management O Traffic Management O Accountancy O Cost Accountant NaMe. O Telegraph Engineer O Telophone Work OD Mechanical Engineer U Mechanical Draftsman O Machinist O Toolmaker O Patteramaker O Hest Treatment of Metals O Bridge Engineer OD Bridge and Building Foreman O Gas Engines Oj Diesel Engines O Aviation Engines 0 Automobile Mechanic O Plumbing [D Steam Fitting Heating GO Ventilation OC Sheet Metal Worker O Steam Engineer © Steam Electric Engineer O Civil Engineer D Surveying and Mapping D Refrigeration OR. R. Locomotives D R. R. Section Foreman OR. R. Bridge and Building Foreman BUSINESS TRAINING COURSES OC. P. Accountant O Bookkeeping O Secretarial Work O Spanish O French D Salesmanship D Advertising D Service Station Salesmanship First Year College O Business Correspondence U Lettering Show Cards O Signs D Stenography and Typing D Civil Service © Mail Carrier AdATCSS...esveerscsereeee CRD is isstsrcausccten POERA aai araa aa «Occupation if you reside in Canada, send this coupon to the International Correspondence Schools Canadian, Limited, Montreal, Canada O Air Brake OR. R. Signalman D Highway Engineering O Chemistry O Pharmacy O Coal Mining Engineer O Navigation ( Air Conditioning O Boilermaker OTestile Overseer or Supt. D Cotton Manufacturing O Woolen Manufacturing D Agriculture O Fruit Growing O Poultry Farming O Radio D Marine Engineer O Railway Mail Clerk O Grade School Subjieota O High School Subjects O College Preparatory O Illustrating D Cartooning DY Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 9

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TE AL TE PI SHARPEN LAWNMOWERS AND EARN GOOD MONEY Make $30 to $40 a Week in your Spare Time Build Your Own Profitable Business Anyone who wants to make goot money either in his spare time or tulE time can do so by sharpening lawnmowers on the IDEAL Lawn- . mower Sharpener, Many men have made as high as $50 a week in their spare time alone. Most men will average around $30 to $40 a week, J. B. VanDien, Ridgewood, N. J., writes: “Some weeks last summer I earned: $40.00 a week with my Ideal Sharpener Just as a sde tine.” H. Greenlaw, Fond du Lac, Wis., writes: “During May F sharpened over 200 mowers at $1.00 each.’’ Niles C. Race, Roches- ter, N. Y., writes: “I heve sharpened 785 mowers at $1.00 each.” The ideal Lawnmower Sharpener Makes old, dull lawnmowers cut like new. It uses the correct princi- pte of grinding the blades on a grinding wheel—the FACTORY method—and the method we have used for 30 years. This produces the proper bevel or clearance and is the only way old, dull lawn- mowers can be perfectly sharpened. Mowers run easier—stay sharp longer—customers come back year after year. No Experience Necessary No experience is required. Start right at home, Attach the Ideal to your lamp socket. Blades are automatically ground to fit the cutter. bar without taking lawnmower apart. You can sharpen any make of lawnmower in 15 to 20 minutes—you get $1.00 to $1.50, depending on size and condition of mowers. New attachments also grind skates, grass shears, hedge shears, sickles, scythes, axes, gum saws, etc. SEND POST CARD TODAY FOR feccatalog ROOT-HEATH CO. ree 384 Bell St. Piymouth, Ohio STUDY AT HOME We guide you step by step—furnish all text material, including fourteen-volume Law Li- brary. Training prepared by leading law profes- sors and given by members of the bar. Degree of LL.B. conferred. Low cost, easy terms. Get our valuable 64-page “Law Guide” and “Evi- dence” books free. Send for them NOW. | LaSalle Extension University, Dept. 5493L Chicago Learn RADIOTELEVISION ELECTRICITY: TALKING PICTURES Times are getting better. Trained men are getting jobs. National will quickly train you to quallfy for good jobs in all branches of radio, tele- viston, talking pictures, broadcasting, operating and general elec- trielty. Thorough, practica? training. Over $100,000 in modern equip- ment. National graduates in demand. Regardless of age or education you can learn profitable trades ina few months. Shop and studio practice, QUALIFY AS A ee ROOM PND BOARD WHILE LEARAMA % of our students earn living expenses while Radi Hepat Man receiving training. We help you get a job. - For islon Expert jimited time will allow your coach railroad fare Control Operator to Los Angeles. Station Technician TRAIN IN LOS ANGELES Sound Expert 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 Electrician 29 years. Send for free descriptive book and and many ather jobs enrollment details. NATIONAL RADIO ELECTRICAL a SCHOOL: Los Angeles Dept. MMR-5, 4006 Figueroa St., Send Book and full details of Courses. p NAME. osses reniras ADDRESS..... VERY SIMPLE AND EASY PAINT SIGNS WITH LETTER PATTERNS! NO LESSONS OR EXPERIENCE REQUIRED ABCDEF 1234 abcde You can paint neat, appealing and iene attractive signs right now, ever A BCDE123 abcd though you have never handled a brush Teva Tree yeras before. This is a most practical meth- od, which requires no lessons whatever. ABCDE PÆ} abc You merely. trace around fetters with N0,320 Lee pencli, fill In with color and there you ABC 3 have the splendid completed sign. Merely aoc roy get the patterns. You can easily:do the O; rest. Each letter is cut from durable sten- "ett board with smooth edges, which allows ALAN IPA for rapid outlining. Try it now, and see what wonderful work you can do promptly. PRICE per ALPHABET OF 26 LETTERS:1% In., 60c.; 2 In., 70¢.; 3 in., 85c.; 4 in., $4.10; 6 in., $1.75; 8 #n.,$2.50; 10 in., $3.25. Lower Case or small letters made to match capitals up to 4 inches, same price as capitals. PRICE per SET of 10 NUMERALS: I'7_in., 25e.; 2 in, 30¢.5 3 Im,-35c.5 4 In., 450.7 6 In, 70¢.; 6 In, $F.00; (0 In., $1.25. Orders filled promptly and postpaid. State number and size wanted. Complete list of other styles sent with order. Reat oppor- tunity awalts you here. JOHN F. RAHN A2120-22 Chicago, II. WONDERFUL NEW INVENTIO SOLDERING IRON AND : BLOW TORCH IN ONE Neva Ave. Pays for itself in one jobt Needs no pump or pressure system — no stove— no char- coal—ne separate blow torch, Burns an hour at less ¥% cent for gasoline. AGENTS’ OFFER WriteforSpecialOfertoagenta, The Justrite is an ideal proposi- tion for either mainline or side line — foll time or spare time, 10. Thank You for Mentioning Modern-Mechaniz and Inventions fer May When Writing to Advertisers. -

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~ Amazingly Easy Way to get into ELECTRICITY Don’t spend your life never sure of a job and at dull uninteresting work. Now... and forever . . . say good-bye to that. uninteresting, unsteady low pay job. LET ME SHOW YOU HOW TO PREPARE FOR POSITIONS THAT LEAD TO $50.00 A WEEK AND UP IN ELECTRICETY—NOT by book study, but by an amazing way to teach RIGHT HERE IN THE COYNE SHOPS IN CHICAGO that makes.you a prac- _ ‘tical trained man in 90 dayst THEN YOU CAN PAY ME AFTER GRADUATION IN EASY MONTHLY PAYMENTS! Learn By Doing In 90 Days Lack of experience—age, or ad at no extra cost,

no difference! Don't let lack of moneyeton yvon, Mostof themen Coyne have no more money than you have. That's why I 4 have worked out my offers. I£ you-need part-time work to help pay your living expenses and will tell me your problems: È may be able to: help you as į havethousandsof others. Then, in 12'brief weeks, in the great roaring shops of Coyne, I train you as a yoy never dreamed you could betrained.,.ononeof the- greatestoutlaysofelectricalap- ` paratus ever assembled....r dynamos, engines, power p! sutos, switchboards, transmit- tingstations...everythingfrom ~ doorbells. to farm: power and lighting...fall-sized...in PREPAREFORJS JOBS

Here are a few of SE neds of positions in the electrical field. Our free employment bureau gives you. life-time employment service. Substation 6 Expert ub:

tion Operator Electrician.

, Maintenance Engineer Service Station Owner Radio Expert

full operation every day! fase eee rE C. LEWIS, President. TRAINING | COYNE ELECTRICAL SCHOOL, Dept. 54-53 by Actual Work , Esces. Paulina St., Chicago, It. i If you are short of money this a oe a : E Dear Mr. Lewis:—Without obligation send me your big oaan booe Do bamme |. vent you from getting my training , You car È Be cua mi a demis gi zau Ser oe BERE ‘traini ‘all: |: take my training and PAY GOR IE APTER GRADUAL ATION ELAN. reatactualworkwithonly |. YOU. GRADUATE—IN EASY MONTH- | reatactualwork withonl? | L¥ PAYMENTS. Mail coupon for mp | © Building reatbatteries... ; plan. E E winding real armatures, COYNEBECIBICAL scoot a ni aea HeC. LEWIS, Pres, Founded 1849 . a S00 S. PAULINA ST., Dept. 54°53 CHICAGO, ILL. § City... ee ccc eee e eee ee Statessa .

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

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Chips from the Editor's Workbench The Workbench is sending out an SOS for photos of MM radio “ham” outfits. Two prizes are offered for the best pictures submitted. HOTOS for the home workshop contest announced in the April issue are coming in fast. There still is time for some of you portshop fans to try for the two prizes of- fered. The contest closes April 15. And this month we are ready to offer real money for photos of radio outfits built from plans published by MopERN MECHANIX AND INVENTIONS. All you have to do is snap a picture. Better take it outside if you don’t know the tricks of photography. For the best picture submitted to the Editor’s Workbench, accompanied by a brief letter explaining the set, transmitter, converter, or what have you, the editor will pay five dollars. For the sec- ond best, three dollars. The pictures must reach the Editor’s Workbench, Modern Me- chanix and Inventions, 529 South Seventh St., Minneapolis, before May 15. a x Remember that article on a mouse circus? Judging from this letter from the author of the article, mouse circuses are becoming quite the thing. He says: St. Louis, Mo. Dear Editor: I am enclosing for your kind inspection two pictures of a “Mouse Circus” made by a St. Louis man from my article. (The pictures were not clear enough to reproduce here.) You may be interested in knowing that since the article has appeared, I’ve seen a great number of these sets in dozens of stores. Harold L. Zimmer. * z * Pictures of some clever midget cars are arriving in every batch of mail. S. M. Shively tells us about his: This midget car will do 15 miles an hour with its washing machine motor. S. M. Shively’s letter tells how it’s built. 12 The “Sunapee,” 22-foot cruiser, is the newest ship in MM’s popular fleet. Carl A. Gage, of Minneapolis, built the original above. The blueptints are now available. Grafton, O. Dear Editor: i I am sending a snap of another midget car. It is powered with a souped up battery type Maytag engine. Speed about 15 miles per hour. It has the crankcase compression raised and we made a high compression aluminum piston for it. The compression is about 85 Ibs. per square inch and it must be run on Ethyl gas. The best feature of the car is the sliding motor base which acts as clutch. To start, the shift lever is shoved forward, tightening belt and off she goes. A Model A Ford fan belt is used for drive, gear ratio is approximately 4 to 1. It is very easy on gas. Steering is by cable. S. M. Shively. * * % Here’s a letter from Austin E. Young that speaks for itself: Syracuse, N. Y. Dear Editor: Last year I built the Dorothy, with the usual few changes of course. Started the job in April and launched her in September, 1932. Had to- move her seven miles to the water. October 19, 1932, we started for Florida with wifey and a friend via Barge canal and the so-called inland route down the Atlantic coast. Returned home seven months later having cruised over 3,000 miles. We lived aboard ex- cept for one month in New Smyrna, Florida. The “Nameless,” so-called because we start- ed with no name, is powered with a model T Ford conversion which performed very well. - The sail rig is sliding Gunter, used on account of the low bridges on the Barge Canal. Austin E. Young. k * ` A few stray chips ... Turn to pages 94 to 97 and glance at the “Sportsmen’s Camp- fire,’ conducted by Robert Page Lincoln. What do you think of it? ... The “Suna- pee,” 22-foot motor cruiser, is just one of many how-to-builds in the new blueprint booklet that have never been published in M-M. Get your free booklet now ... Many readers seeking information are forgetting stamped, self-addressed envelopes,

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hy waste time on old fashioned methods —when you can learn to play at home without a teacher ON’T: Ict the thought of long years of tire- some practice scare you away from learning to play! Don’t let the thought of an expensive private teacher keep you from letting your dreams come true! For you—anyone—can easily teach yourself to play—right in your own home, in your spare time, and at only a fraction of what old, slow methods cost! It’s so easy! Just look at that sketch at the right. The note in the first space is always f. The note in the second space is always a. The way to know the notes that come in these four spaces is simply to remember that they spell face. Now, isn’t that simple? You don’t have to know one note: from another in order to begin. For the U. S. School way ex- plains everything as you go along—both in print and picture —so that, almost before you know it, you are playing real tunes and melodies right from the notes. You simply can’t go wrong. First you are told what to do, then the-picture shows you how to do it—then you do it your- self and hear it. No private teacher could make it any clearer. Easy as A-B-C No wonder over 600,000 men and women have learned to play this easy way! For this famous course is based on sound, undamental musical principles, highly simplified. It’s not a “trick” or “stunt” method. You learn to play from notes, just as the best musicians do, You learn to pick up any piece of music, read it, and understand it. No time is wasted on theories. You get all the musical facts. You get the real meaning of musical notation, time, automatic finger control, harmony. You'll find yourself studying the U. S. School way with a smile, Your own home is your studio. The lessons come to you by mail. They consist of complete printed instructions, diagrams, all the music you need. There are no dry-as-dust exercises to struggle through. Instead, it’s just like playing a game—you learn so fast! No Talent Needed Forget the old-fashioned idea that you need “talent.” Just read the list of instru- ments in the panel, decide which one you want to pay: and the U. S. School of will do the rest, And re- member—no matter which in- strument you choose, the cost in eaeh case will average just the same—only a few cents a day. CHOOSE YOUR COURSE Pleeolo "Cello Sight Singing Ukulele Hawallan Steel Gultar Clarinet Fluto Saxophone ` Trombone Volee and Speech Culture Harmany & Composition > Automatle Finger Control Plano Accordion Italian and German Accordion Banjo. (Plectrum, 5- String or Tenor) Junlors” Plano Course Plane Organ Violin Drums and Traps Gultar ~ Mandolig Harp Cornet 7 You'll never regret having learned to play. For. those who can entertain with music at parties—who can snap up things with peppy numbers— are always. sought after, al- ; ways sure of a: good time! Start now: and surprise your | friendsf usic | If you can read the alph bet you- can learn to play your favorite instrument In- Just a-few months. Free Book and Demonstration Lesson “How You Can- Master Music in Your Own Home’’ is an interest- ing little book that is yours for the asking. With this free book we will send you a typical demonstration lesson that proves better than words, how quickly. and easily you can learn to play your favorite instrument by- note—in less than half the time and at a fraction of the cost of cld; slow methods—the U. S: Sctiool: way. The beoke let will also tell you all about the amazing ‘new Automatic Finger Control. If you really want to play—if new friends, good times, social popularity, and’ increased income appeal to you—clip: and mail the coupon NOW. U. S. SCHOOL OF MUSIC, 2625 Brunswick Bldg., New York City. Thirty-sixth Year (Established 1898 ) ms ee ee ee ee ee U. S. SCHOOL OF MUSIC 2625 Brunswick Building, New York City Please send: me your free book, “How You Can Master Muste in Your Own Home,” with: inspiring message by Dr. Frank Crane, Free Demonstration: Lesson, and: particulars of your easy payment plan. I am interested in the following course: i Hare you veer see tea e eee e cree een teen e een en eee INSUUMEME? voc cen esos eee Name.sceccccesvveess Address sererpopesvasocasaosevevoosossosessoe City.. sonson ese. Binto.. eosesees Aeee SS ST Co Thank You for Mentioning Modern Mechanix and: Inventions for May When Writing to Advertisers 13

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not add... »If m do INCHES TO YOUR BICEPS THREE INCHES TO YOUR CHEST «.. Zt won't cost you one cent!” Signed: GEORGE F. JOWEIT f I "WO solid inches of tough, sinuous muscle added to your biceps... three inches to your chest... or it won’t cost you one penny! Thats my uo- qulified agreement! If | hadn’t accomplished this for many others...If I wasn’t absolutely sure that you could do it...I wouldn’t dare make such a startling claim! You will not only increase your biceps, but every parc of your body will be developed proportionately ... I’! show you how to add at least 3 inches to your chest... I'll show you how to get lithe, muscular legs that will be columas of power for speed and endurance... your whole body will vibrate with muscular energy, pep and health! Take my full course, if ic does not do all I say...if you are not completely satisfied...and you are the judge...it won't cost you one penny! I want you to try one of my test tourses NOW! Send for “Moulding a Mighty Arm” A Special Course for ONLY 25c. It will be a revelation to you. You can’t make a mistake. The assurance of che strongest armed man in the world stands behind this course. I give you my secret methods of development illustrated and explained asyou like them. Mail your order now while you canscill get this course for oaly 25c. I will noc limit you to the arm or chest... Try any one of my test courses listed below at 25c. Or, try all six of chem for only $1.00. Mail your order now and I will include a FREE COPY of “NERVES OF STEEL, MUSCLES LIKE IRON.” Ic is a priceless book to the strength fan and muscle builder. Full of pictures of marvelous bodied men who tell you decisively how you can build symmetry and strength the Jowett Way! Reach out — Grasp this special offer! FREE BOOK WITH PHOTOS OF FAMOUS STRONG MEX SOWETT INSTITUTE of PHYSICAL CULTURE Dept. 37Ec 422 Poplar St.,.Scranton, Pa. Send, by return mail, prepaid, the courses checked below, for which I am enclosing $, Mould! Might: Mouldii Might; C Bioutding a migni, C giydin a Mighty, O Moulding a Mighty O Moulding mighty Back. . . 25c Lege. . . i i Stı M pirea Mie, OO Madeteasy” Sts OC All6 Books for $1.00. “*Nerves of Steel” included TREE Name. Address. u Sharpened over 2,000 lawn mowers last season Ivan G. Long “I sharpened between 2,000 and 2,500 lawn mowers this season. I cover a territory of 50 miles around my home town and have all the work I can handle. With the Foley Lawn Mower Sharpener I can handle up to 40 mowers a day.” Ivan G. Long, Penn, Many other men like Mr. Long are independent and making big money in the fine cash business of sharpening lawn mowers with the Lawn FOLEY Electrakeen tower Sharpener No experience required. Simply put mower in the machine —the Foley does a perfect jo) automatically, in 15 or 20 minutes. Sharpens all kinds and sizes hy factory method. You get $1.00 to $2.00 each for hand mowers and $4.00 to $6.00 for power mowers. Investigate NOW! S P E c l A L 0 F F E Attachment for grinding axes, hatchets, knives, etc., included FREE. Brings you business the year ‘round. Small investment, easy payments. Best season just ahead! Write today for FREE business-starting plans—no obliga- tion, no salesman will call. FOLEY MANUFACTURING COMPANY 506-4 Foley Building, 11 Maln St. N. E., Minneapolis, Minn. Utterly New Idea Brings - immediate Profits to Those Who Need Money!! IMAGINE! 8 big bars of fine tollet soaps in a gorgeously % colored box for only 39c—a full $1.25 value. But that’s not all —with each purchase you present your customer with one of these multi-colored circulars that_ puts them in Ilne fer a $50 CASII PRIZE or any one of nine other valuable merchandise prizes. With the contest craze sweeping the country it’s simply uncanny how folks clamor to buy this big box of soap at the ridiculously low price of only 39c, and have a wonderful oppor- tunity to win $50 IN CASH or d a valuable merchandise prize. Cash In on this new gelling sensation. We furnish everything you need to start earn- ing real money immedlately. Ure Gooey. y i SIZED Actual size of box: X SAMPLE, 35c 11%” x5”s1” Ñ Write for FREE details. Tor gick action i endlose 35c for actual, full size VICTOR sample postpaid for your inspection. Return it in 5 SOAP co. days and get your money ept. 8-44 back If you’re nat satisfied. DAYTON, OHIO Des 14 Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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L. L. Cooke, Founder, and F. L. Howard, Chief Engineer, L. L. Cooke School of Electricity. It’s today’s great Opportunity for you and every cther man who is sick and tired of struggling along on small pay. Hundreds ef “Cooke” trained men, who knew nothing about Electricity when they started my Training, are now,—even in these days,— making $40 to $75 a week;—and some are making a great deal more. , CALLE UAI] LEARN AT HOME IN SPARE: TIME week Learn with the famous L. L. Cooke “Work Sheet” and “Job- a Ticket”? method. It’s simple—it’s practical—it’s easy. It’s just like Shop Training,—only it’s all done right in your own home, eee OED with the 5 Big Working Outfits. given to you without extra mant oe ae BETTER JOB charge. And it’s done in your spare-time, without quitting yeur Getting doubl “¥our ‘training + 1 5 3 fone ane pat a prani present job, or losing a single hour’s pay. am now Head fg 24 bigger pay. am per am | Eem oaas PREVIOUS EXPERIENCE NOT NEEDED Critchton,. Ala. [i but kaeT R? | Purnell, 65 N. A Santa Anita Av., F Pasadena, Calif. PAY You don’t need previous experience—you don’t need higher education,—to learn Electricity the L. L, COOKE way. A common grade schooling is enough. This great Course of home-training is amazingly simple and clear. There's nothing like it anywhere. It's the Training with hundreds of successful grad- uates, —men on Easy Street, today. It’s the Training for YOU. tte “Your training 1 í sure ‘good. Boss ee Clr IF YOU ARE MAKING A CENT LESS THAN So Mee ened Hieven't Jost a k i . i me go ance sere are | $50 a Week — Investigate! Conwell St, A i “Cooke Trained Men” are the “Big Pay Men”, everywhere, $40 to $100 a ia $ week is what hundreds of them are making, today. That’s the kind of a job for you. Get started under the famous L. L. Cooke Money-Back Agreement. 5 . re : Rhode Island. ` Act today—to increase your pay. Send coupon for Big FREE Book, and full particulars, now. No obligation on your part. “ u 4 zoe . FREE BOOK COUPON COOKE Training Is x Ł. Ł. COOKE SCHOOL OF ELECTRICITY m.m ; Dept. 35, 2150 Lawrence Ave., Chicago l Shop Training for Send me your FREE BOOK in Elecirieity 3 ~- the Home and all details of your home training course and your MONEY BACK agreement. = 3 N Z S Y a di Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 15

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Architecture |? ony pe aonne ean ee caterers See oe ~ and asne C a Building |- | Building AE] ESEU ess er roca 2 echa- uper vinn S Eesi Carpentry HELPS for Home Builders or anyone planning to build How to Build—What to Build When to Build A gold mine of facts can often be converted into a gold mine of dollars, for builders not only wrooozeer Save money but learn how to make more money with the five big books on archi- tecture, carpe! an ding. Carpenters make themselves contractors by learning how to estimate correctly; contractors are able to handle bigger and more profitable jobs by learning how the big fellows do it. Men who want to build homes can save money by learning how it should be done. The new Jiffy Index puts before your eyes without wasted time, the things you want toknow, Nothing has been overlooked. Use of tools, build- ing construction, heating, lighting, plumbing, architectural drawin all fully covered. We will include with the five volumes above, at the special reduced price of only $19.80 (easy payments) a handsome book, ‘‘Blue- print Reading,” 120 pages, full diagrams, ete., without extra charge. No Money Needed--Don’t Send a Penny You take no chance of any kind. Just send us your name and address on the coupon and we will ship the complete set of five big volumes, 2,400 pages, without a penny of down payment. Look them over, find out any- thing you want to know and then, at the end of ten days, if you want to keep them, send only $2.00. After that send only $3.00 per month until the special price of only $19.80 has been paid. (Former price, $24.80.) =a—=====9FOR FREE OFFER USE COUPON+=—-s00=0= American Technical Society, Dept. G-5320, Drexel Ave. at 58th St., Chicago, Ill. I would like to look at the five books described above. Send them on your free offer, I will examine them thoroughly and return them in ten days unless I like them, in which ease I will send you $2.00 and after that $3.00 per month until the total price of only $19.80 is paid. You are also to send me your book, ‘‘Blueprint Reading,’’ without extra charge. Name ... Address .. Attach letter stating age, occupation, employer’s name and address and that of at least- one business man as a reference. Che Math Pony . „A Dictionary of Numbers _ _ Multiplication reduced to Addition— Division to Subtraction, Has multiplied for you all products from 1 to 10,000. More accurate thana slide rule—simpler than a “‘log’’ table—easier to use. than either. Save mental effort, eliminate multiplication errors, and conserve time. Never can become obsolete. Pays for itself in a few hours of use. ER 90,000 products—212 pages—sewed binding—opens flat. HEAVY PAPER COVER $1.00. ART FABRI- KOID COVER (semiflexible) $1.50. Agents wanted. Order your.copy Now. THE MATH PONY PUBLISHING CO. Box 1810-B. Milwaukee, Wis. For the lageatity regarding RRP RAR” in which Wu you are INTERNATIONAL CORRESPONDENCE SCHOOLS Box 2319-W, Scranton, Penna, Without cost or obligation, please send me latest in- formation on (1 Railway Postal Clerk LI Post Office Clerk, O City Letter Carrier O Rural Carrier O File Clerk O Stenographer O Typist (14th Class Postmaster N GME... sesserssrervacssscsnsanensnoncscnavresncncecssncnssszensnssanensssazceseceecesonss Address. „li 1 PAYS FORS3000 LIFE PROTECTION ‘Even if you are past 55 —and without Medical Examination! IF YOU are between the ages of 10 end 7 you may now enjoy the bene- fits of reliable life protection for only $1, and without a medical examina~ tion. This new Life Protection Cer- tificate, offered exclusively by one of the largest associations of its kind in the state of California and subject to rigid examinations by the State Insurance Department, pays up to $1500 For Death From Any Cause ; $2000 to $3000 for accidental death. Your protection is backed by a sound financial institution with more than 25 million dollars life protection in force. * SEND NO MONEY. Just your name, age, name of beneficiary, and a Life Certificate, fully made out in your name will be sent to you for 10 Days Free Inspection. NO AGENT WILL CALL. If you decide A 10-D to keep it, send only $1 to put your ccept 10-Day protection in force for at Jeast 45 days ... then about 3c a day. If not, you E owe nothing. OFFER LIMITED, So write today without obligation. Inspection Offer NATIONAL SECURITY LIFE ASSOCIATION Dept.C181 204 S. Hamilton Drive, Beverly Hills, Cal. ANY PHOTO ENLARGED, Size 38x10 inches or smaller if de- TR sired. Same price for full length or bust form, groups, landscapes, pet i animals, etc., or enlargements of any 5 part of group picture. Safe return of original photo guaranteed. SEND NO MONEY 232211 photo or ner p snapshot(any size) and within a week you will receive your beautiful life-like enlargement, guaranteed fadeless. Pay postman 47c plus postage—or send 49c with order and we pay postage. Bi 25x20 non, Sniargamont smt O- o. D. 78c plus postage or seni jc and we pay postage: Take a tate of thi ing off now. Send your photos today, Specify tio wanted. S os = STANDARD ART STUDIOS, 104 S. Jefferson St. Dept. 374E, Chicaga .. TIT a Wis yee Steady Work—Good Pay. ge Big Demand in this NEW Industry. Learn this great trade QUICK—EASY. Complete ` Outfit and Course of instruction at low cost NOW. Pay weekly usycu Jearn. Write for full particulars and Temporary Special Offer Quick. COLEMAN ELECTRICAL SCHOOL, 1623A Main, Kansas City, Mo. Dirt Track Racing Now you can break into the racing game. How to build your racer, contest rules, supercharges, bal- ance, speed, “‘revs,’? compression ratios—a complete racing treatise. illustrated. Postpaid $1. Madisonville, Cincinnati, Ohio.- RAY KUNS, Dept. A, lhoase A LAETI alL INC G wise choice for any young man. The government is now spending millions of dollars to promote commercial aviation, to build hundreds of new airports and thousands of - new airplanes. This will mean thousands of new jobs. Now is the time and Lincoln is the place for you to train yourself for one of these good pay jobs in aviation. Lincoln-trained pilots and mechanics command higher pay positions because they are better pre- pared. World’s Best Known School. Government approved. Unexcélled equipment. Complete train- ing including blind flying, cross country, acro- batics, master mechanics, airplane and engine course. Write-teday. State your age. LINCOLN AIRPLANE & FLYING SCHOOL 405C Aircraft Bldg. Lincoln, Nebr. 16 Thank, Y ou~for. Mentioning: Modern Mechanix and Inventions for May, When Writing to Advertisers

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A SNOW STORM GOT ME STARTED AS AN INVENTOR How a bad wash day led to an invention that developed into a successful business By J. B. Clay President of the Clay Equipment Corp. Cedar Falls, lowa Often a little, simple in- vention turns out to be a big financial success. The crinkly hairpin, the rubber tip for lead-pencils, the pa- per. clip, these and thou- sands.of other articles that we use every day of our lives, were the “happy idéas” of someone. articles how these HAT! You mean to say I’ve got toshovel through a hundred and fifty feet of that snow to get to the clothes line; I’ll be late for work!’ I said, thoroughly peeved. But if I had only known it, that unpleasant foot of damp snow was a turning point.in.my life. It started me off as an inventor. It was the begin- ning of the large manufacturing business of which J am now the head. “Because that morning, out there in that cold, wet snow, I decided I would figure out an im- provement over the old clothes line stretched between two poles. “Soon I worked out the idea of a big wheel placed horizontally on a pole with a line running round and round through the spokes. It was compact; it stood right behind the house; you stood on.one spot, simply turning the wheel and it held a whole week’s wash, | “Tt worked so well I decided to In the interest of and ‘inventors, the Victor J. Evans Company. has asked successful American manufacturers of simple inventions came about. is the true story of the now famous Sunshine Clothes Drier, as told to us by Mr. J. B. Clay, President of Clay Equipment Corp., Cedar Falls, Iowa. invention Below by I was selling my clothes drier around town. Then, we began to manufacture it on a larger scale. Today the Sunshine Clothes Drier is the largest selling drier on the market and our company has pros- pered as a result of its popularity. “In addition to the Sunshine Clothes Drier, I bave since in- vented and patented other prod-` ucts for the home and farm. But it all started that wet, snowy morning when I began to think oí a better way to do a simple chore. That snow storm has been worth many thousands of dollars After tramping through a heavy snow like this to hang u clothes, Mr. J. B. Clay, Presi- dent of the Clay Equipment Corp., decided he would figure cut a better way. He did, and the snodern Sunshine Clothes Drier shown at the left is the result. as the inventor, are entitled to “receive. Further, you should not delay about making your appli- cation for a patent. This is a large country and it is not un- usual for two or more inventors living many miles apart to con- ceive the same or practically the same idea, and the man whose patent application is filed frst, usually has a better chance to se- cure the patent. So prompt ac- tion is often important in Patent matters. Our Free Book Explains All Steps Clearly In a big, fully illustrated book, “Patent Protection,’ we have clearly and simply set forth the facts that inventors should know: How to make your patent application, how the patent laws protect you, all about sketches and models, important mechani- cal movements, and much more. With the book, we will also send you eur “Evidence of Invention” form on which you can sketch your idea for the purpose of having it witnessed as legal evidence in case you need it. For more than thir- ty-five years, this organization has served America’s inventors—many thou- sands of them. Our book gives you in- formation which from long experience we know you will need. Both the book and the Evidence of Invention form are FREE. Mail the coupon today and you will receive them promptly. ee ee VICTOR J. EVANS & CO., I to me.” i Main Offlee: 620E, Victor Building, Washington, D. C. i if You Have a Good I Iidea—Protect It i Ideas that will make i money, save labor or give pleasure are always in de- mand. Hf you have one, | your very first thought should be to protect it, by means of-a United States Patent. Without a Patent, E you stand little chance to Other Offices: 1640B, Conway Bldg., Chicago; 1007 B Woolworth Bldg., New York; 514B Empire Bldg., a Pittsburgh; 10108 Hobart Bldg., San Francisco. I am interested in your book, PATENT PROTECTION and your Evidence of Invention form. Please send both FREE and without obligation on my part. I Stréet and. Nos si edd deceiateaees cheese deed 644% x | Ciiyor Towi e yn erea a a E Stale. as (Be sure to write or print name carefully) take out a Patent on it. By and __ seap the profits which you, l ED En E EE m e ee ee ee "di; Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 17

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Interesting problem letters sent in by readers are answered l in this department for your benefit. RADIO-CONTROLLED MODEL BOATS Where can I get plans for building a radio con- trolled model battleship? Is a license needed for operating it?—H. M. A., Frederic, Wisc. Plans for this project were published in the 1930 How-to-Build-It book, which is still available here at 50c postpaid. Regulations of the Federal Radio com- mission prohibit the use of spark coil trans- mitters of any kind. Experimental work on radio control of mobile units can be con- ducted with vacuum tube transmitters on amateur. frequencies provided transmitter is licensed, and person operating it has an amateur radio operator’s license. : xe Ed * CLEANING MARBLE TOMBSTONES Is there any solution that will clean marble counters and tombstones?——-L. B. H., Rolling Fork, Miss. ` A weak solution of oxalic acid can be ap- plied with a sponge or rag, washing quickly and thoroughly with water to remove all surplus acid. Rub well with finely-pow- dered chalk moistened with water to restore the luster. $ x * ELECTROCUTING WEINERS I have tried roasting weiners on two nails con- nected to 110 volt lines, but the “hot dogs” just won’t get hot. Can you suggest a remedy?—A. B., St. Louis, Mo. Pour a little salt water around the nails after the weiner isin place. This lowers the resistance of the meat, allowing more cur- rent to pass. It may be that the weiners used were a bit dry, and therefore high in resistance. * z x CONVERTING AUTO GENERATOR TO 110 VOLTS Can a 6 volt Ford A generator be rewired to deliver a constant voltage of 110 volts a.c. at all speeds, for operating a car radio?—E. J. U., St. Paul, Minn. Complete plans for the above generator conversion, together with instructions for rewinding and rewiring many other gener- ators are given in the book “Auto-Power,” which we can supply at $1.00 postpaid. Further details on the book will be sent free on request. 18 TWO-CYCLE ENGINE TROUBLES In March “Problems” M. M. of Royston, Ga., had trouble with a two-cycle motor. This motor has no valves. The inlet and exhaust gases pass through ports in the side of the cylinders, The peculiar sucking and blowing through the intake manifold indicates that the piston should be turned half way around inside the cylinder. Two spark plugs can be fired simultaneously with one spark coil by bringing out both ter- minals of the high tension winding, and con- necting one to each plug. The body of the engine provides a path for current between the two plugs.—S, A. T., Minneapolis, Minn. .. Many thanks for suggesting a cure for M-M’s. trouble and for telling of the spark coil. kink.. + * x ONE TUBE CONVERTER BLUEPRINTS © Do you have blueprints of the short wave con- verter which appeared in the March, 1934 issue of MM?—E. K,. B., Greenfield, Ind. i A blueprint giving plans for the one tube adapter which appeared in October, 1933, together with the changes published in March, 1934, to make this adapter suitable for any radio, is available at 25c postpaid. ALUMINUM CHEEKS FOR TARGET RIFLE I have mounted a telescopic sight on my target rifle, and now wish to have a cheek rest made of aluminum. What material would you suggest for making the pattern? —E. L., Stoughton, Wisc. Ordinary modelling clay should- prove very satisfactory for your purpose. It is slow enough in drying to give plenty of time for trying out and reshaping the form to suit. After the desired shape of rest has been obtained, bake in oven to dry. BUOYANCY OF PONTOONS How can I compute the weight an air tight steel drum will support when partly submerged in wa- ter?—-N. B. J., State Soldier’s Home, Ohio. This tank will support a weight equiva- lent to weight of the water it displaces. Compute the volume in cubic feet of that part of the tank under water, and multiply 62.4 pounds, weight ofa cubic foot of water. (Editor’s Note—Because of space limitations, only letters of general interest can be answered in this department. For a personal answer to your problem, be sure to include a stamped addressed envelope with each letter.

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$ You at Home for GOOD PAY RADIO WORK LET THESE ENGINEERS RIGHT FROM THE HEART OF THE BIG RADIO INDUSTRY Frain- MANY R.T.1. TRAINED MEN MAKE ZE TO TOn ESS If you’re dissatisfied with small pay—work that’s getting you nowhere—lay-offs and un- certain income—here’s an opportunity that’s too good to miss. At the cost of only the time it takes you to mail the coupon, you can get my big FREE book, ‘‘RADIO’S ` FUTURE AND YOURS.” This book tells how you can learn at home to make more money almost at once in Radio—whether you want to make Radio your life’s work, or use it to pick up an extra $5 to $20 a week in your spare time. “RADIO IS GROWING BY LEAPS AND BOUNDS” says Radio Craft Magazine. It has forged ahead even in depression years. Where only a few hundred men were employed a short time ago, thousands are employed today. Where a few years ago a hundred jobs paid $35 to $75 a week—there are thousands of such jobs today. And more new jobs being created all the time—full time jobs and spare time jobs. Get my book and see how easy it is to learn at home for this good-pay work. R.T. I. TRAINING IS “SHOP TRAINING” FOR THE HOME It comes to you right from the Radio Indus- try—right out of the factories where Radio sets and other vacuum-tube devices are made. It was planned and prepared for you by big radio engineers IN these factories most of whom are the Chief Engineers of these great Radio plants. And NOW these same engineers are actually supervisin, R-T-I Training. Which means that traine the R-T-I way, you'll be trained as the Radio Industry wants you trained—just as the Radio Industry, itself, would train you if it was doing the job. 4 BIG WORKING OUTFITS INCLUDED These are probably the biggest and most ex- pensive Working Outfits ever included with a nome-training Course. You use them to build up testing equipment—to experiment with—to do actual Radio work. It’s Shop Training for the home. SOUND PICTURES, P. A. SYSTEMS, PHOTO CELLS, TELEVISION, ETC. ALL INCLUDED Radio service work is just the starting point in R-T-I Training. From there we take you up through the very latest developments in Radio, and then on into the new and larger field of Electronics—Sound Pictures, Public Address Systems, Photo Cells, and Televi- sion. This feature alone makes R-T-I the outstanding home training in Radio. YOU GET “QUICK RESULTS” G. E. Head, 43i Third St., Alexandria, La., says: ‘‘Made my first money 11 days aner starting your training—cleared Frank E. Kiemann, Lisle, Iil., writes: “Doubled my pay in less than six months.** Harry L. Stark, Ft. Wayne, Ind., weites: “Now making three times as much money as I was when l started your training.” AGE OR LACK OF EDUCATION NO HANDICAP You don’t have to be a high school graduate. It isn’t necessary that you should have fin- ished the grades. My Training in Radio is so simple, so easy, and so practical, that it offers every man, regardless of age, educa- tion, or previous experience, the chance to get out of a small-pay, no-future job, into good pay, big future work in Radio. YOUR MONEY BACK IF YOU ARE NOT SATISFIED That’s my way of doing business. And I'll give you that agreement in writing—an agreement to refund every penny of your tuition if, on completion of my Training, yon are not entirely satisħed. NVESTIGATE! Learn why R-T-I Training is diferent. Find out why R-T-I Trained men get “Quick Results” and “Big Results.” Send today for my big book “Radio’s Future and Yours.” The book is free. RAY D. SMITH, President Radio & Television Institute, Chicago say these 30 LEADING RADIO MANUFACTURERS PT ETTE are talking to YOU AMERICAN TELEVISION ARCTURUS TUBES BALKEIT ° BRUNSWICK CAPEHART e CLOUGH-BRENGLE CO, CROSLEY ° CLARION De FOREST © ECHOPHONE FADA * GREBE * HOWARD HAMMARLUND °° HICKOK INTERNATIONAL RESISTANCE Co. KENNEDY?” KOLSTER®* LYRIC MAJESTIC * PHILCO RADIO PRODUCTS Co. SANGAMO ELECTRIC SENTINEL © SHELDON SILVER-MARSHALL MFG.CO. STEWART-WARNER STROMBERG-CARLSON UNIVERSAL MICROPHONE ZENITH PUM hie MY FREE BOOK Get your copy of “Rae dio’s Future and Yours” today. It tells you about Radio's) emazing opportunities, It dea- cribea my Course, It tellas what R T.I. atue dents are doine and mak- ing. It's FREE. Clip, sien und mail coupon RIGHT NOWI l Ray D. Smith, President, RADIO AND TELEVISION INSTITUTE (R. T. 1.) 2130 Lawrence Ave., Dept. Chicago, UL. l I Without obligation of any kind please wend me a f l l 35, | copy of “Radio's Future and Yours.” I nm inter- ested in your home (raining and the opportunities | you gay exist in the great field of Radio for the l RTI. Trained man. City. . Dc a ce ell A {KS 8+ Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 19

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pi Try A of These Remarkable Seed Novelties E. THE

REMARKABLE Aiea Ua . The Wonder of the World Japanese Rose Bushes bloom all the year round. Just . thinkofit, Six weeks after planting the seed, the plants will - bein full: bloom... It may not seem possible, but we posi- j tively- guarantee it to bo so. They will bloom every ton: weeks, Summer or Winter, and when three years old the ). bust will be a mass of roses, bearing from five hundred to ‘a:thousand roses on each-bush. ‘The flowers are in three shades —white,,pink, andcrimson. The plants will do well bothin and out-doors:. We guarantee at least three bushes to grow from each ” packet'of-seed, Price, 10c packet, 3 pkts. for 25e postpaid, Chinese: Fragrant: Tree: Fern) Weather Plant Jost introduced; noted for NATURE'S WEATHER PROPH ito anid groai ere placo thi remu cpanzen qt uka A = place, this remarkable je $ tal it. Foliageisrich . rately _ forecasts the weather FIREFLY PLANT siorcanna iis the-Atmosphere with Fragrant Aroma Y oe of the most rapid growing vines known. Under favore’ able conditions this vine haa been known to grow OVER 25 REETINAS GLE WEE tas oy av short space of time leed the Vine has clim agreat eight, an is covered With IMMENSE FLOW. from 5 to 7 inches in-diameter. ie is, indeed, a ARS E novelty, for. unlike o other plants, the -flowers O. VERING, ain open until about Soon eh Pollowing'd ‘aay. In dal ad Tema ghey will will zos main open all day. it} isa most INTERESTING Wateh a dippers and a closing. of the flowers as the clouds Paar an and rse. As the flowers open they give forth e most D) ROMA and:the whole atmo: around is Pallo of Beented fragrance. It is always the object: of favorablé comment, and much curiosity ia aroused by peo- ple-passing at n ight. tine -as-to tbe 3

from 8 to 6 |. for a family “rich find th | Kudzu Vine Most rapid growing vine known. Will grow 20 feet in one week. Luxuriant folja: e; lovely purpie

10 to 16 lbs. and even more.. in nutritious materials, Flavor is much ap] ‘Lown, very proli! uable ‘adjunct to your garden. ‘Try them; you will a. them. fhe most de dolicious vi ev S Imported where. Sample package of Seeds with full direc- > tions for cultivating and cooking.

Japanese Climbing Cucumber Unusuall etrong and view orous growi: vine. Ad twice ‘the size of ordinary vae rieties, Grows family cupplicd R summer. Seeds 15c packt, 3 tor 40c, postpaid. GIGANTIC cinta BUTTER BEANS THE NEW EDIBLE VEGETABLE WONDER E crows to an astonishing size, the Beans measuring feet long, and weighin anything: from e Bean is sufficient ery alataple pna e delica! ppreciated. The Vines are amiy and a most welcome and val- for several arealas tabi have direct, hobtainai ble else- 25c, postpaid, Yard Long Bean Producesenormous crop of long, pen der, round pods, of gzcelient quality or to 5 feet in length, FERN SEED Torns can be grown from eeed. Try your luck growing these beaue tiful planta for indoors or, outdoors, Choicest mixed garictless jearuet “Chinese Cabba Novelty nag China and should be grown in every garden, Seems to © & cross between Celery and Cos Let- tuco Flavor is more mild than any other cabbage. Can be served on tho table and eaten raw or cooked like cabbage, spinach or lettuce or made into salad, Grows very rapidly, easy to cultivate. You can createquiteasen- sation by cultivating this remarkable- novelty. Seeds, 15c packet, 3 pkts. for 400, SURPRISE FLOWER GARDEN MANY RARE AND CURIOUS NOVELTIES An Abundance of Flowers Assured Throughout the Season

the seed; others vary in their ee the constant care gecene go TREE OF

in season seed thing of beauty. delighted with the ne continual surprise age droopina very graceful manner, _ The fo- Se Hage when cut for decorative purpose will last for ‘weeks in water, eed pods are very pretty red berries adding to its beauty. Packet, 25c, 3 pkts. for 65c postpaid HEAVEN ‘This splendid ornae mental tree is s native of China; and. ie called the ‘Tree of Heaven, Sn: Beoount ¢ of iteqrent beaut ed ex hardy, thrives any soil, no ‘matter how poor, and grows from 6to'10 feet high from seed the first sume mer, The, leaves

Bre from. §to6 fest in any length, giving it a grand appearance. Nothing outside ‘he tropics can rival it for lawn decora- ge panicles of bloom, followed by great clusters of colored pods, make the tree a continual Packet, 15c; 3 packets 40¢ Over Hundred Varieties of Mixed Flower Seeds ion, A mixture of easily grown annuals that bloom very,soon after sowing time of Blooming. Those who cannot for finely arranged flower beds will ild Flower Garden, Will prove a and pleasure, as new varieties

flowers, very tra~ ee tender and and the old len favorites flower succeasively grant. Nothing fine flavor. The throughout, the season. „There aro Sne p ben, - vines are rampant varieties of seeds. Man: e may be h de aval ie for growers; an intere be taken inside as house plants and wil blocm shade purposesan esting curiosity. during the winter. | Fine for children, also teach- quick growth, Seeds 15 ers for school gardens. Packet, 15 cents, three

cp Seeds 15c packet, 3 for 40c. jor Sogt packets for 40 cents, Postpaid. J.S. & C0. Address all orders to JOHNSON SMITH & CO., Dept. 717, RACINE, wis. Send 10c for big 710 page novelty catalog

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TURTLES (BLANK CARTRIDGE PISTOL REVOLVER STYLE Sent by Mail for | 99 === Only, ‘Three new models now.out - = 25c, 50c and $1.00. Well A Fascinating made and effective. Mod- lelled on pattern of latest à and type of Revolver, Appear- ke Ai ao H ance alone enoug! scare a burglar. Takes 22 Cal. ee: = Interesting Pet Blank Cartridges obtainable everywhere. Great If you want a fascinating and interesting littie pet, just risk a quarter and we |protection against burglars, tramps, dogs, Have it § wil send you a real live PET TURTLE by mail postpaid to any part of the ying around without the danger attached to other U.S.A. Now all the rage. Thousands upon thousands of these Turtles were |revolvers, Fine for 4th July, New Years, for stage sold at the World’s Fair in Chicago. No trouble at all to keep. Just give it |work, starting pistol, etc. SMALL SIZE 4 in. tong a little lettuce or cabbage or let it seek its own food. ‘They are extremely |25¢- MEDIUM SIZE 5 In. long 50o. LARGE SIZE Qiang gentle, easily kept and live for years and years, Needs lesa attention than any |SIn. long $1.00. BLANK CARTRIDGES SOc per "TARGE other pet. Get one or two. Study their habits, You will find them intensely |200. HOLSTER (Cowboy type) SOc. Shipped by Express on'y interesting, ONLY 25¢ each sent by mait, Special Turtle Food tocpackage \"ot Prepald. 710 page catalog of other pistols, sporting goods, ete. 10a interesting. ONLY 25¢ each sent by mall. Special Turtle Food 10e package Electric Telegraph Set | FRENCH PHOTO RING 5 3 Here is a very great novelty BOYS F A private Electric Telegraph Set of your in Rings, that is selling in to your friends Baier sak ony Efun sending messages Ml DC | ete" e,sntanca in fle 1 . etler Bi get two sets, Doo. em uj : z s es shown in the directions, for TWO-WAY MES- © lion platnum, and tet with BAGES (sending and receiving). No trouble at all to operate with the simple instructions that ace company each set. Operates on any standard dry battery obtainable everye . where. With this outfit you can learn to \ / N a. darge imitation diamond. It looks just like an ordi- nary ring, but in the shank of the ring ia & small micro- scopio picture almost invisi- ble to the naked eye, yet is magnified to an almost in- credible degree and with as- a i tonishing clearness. There is quite an aje PU sortment of pictures that should suit all tastes, Some are pictures of bathing girl beauties, pretty French Actresses, ete., others are views à = 5 of places of interest in France, Panama Canal and elsewhere; £ OT N DASH others show the Lord’s Prayer in type, every word of whick elegraph Set El oat can be re by. Berson with normal eyesight. ‘They are antera acked in neat box with full sere coor esting without being in any way objectionable, PRICE 25e; Mustrated instructions — 2 for 65c, or $2.25 per doz, postpaid. 7,0 page Catalog 10e. ALL FOR 15c (without ci os Z Add 10 tor | Sperm APARMA ALI UADD GEKA A L I/S] BOYS! THROW YOUR VOICE (Canada and Foreign 200.) written specially a y. 27 470 page catatogof = — / : Snte battia ds Intoa trunk, under thebed or transmit and receive messages by the Morse International Code, and in a very short time become an ex- rt operator. Mounted on wooden ase measuring 4 x 3 in., first class construction throughout, complete with key, sounder, magnet, min- iature Western Union blanks, novelties, jokes, amos, motors, radios, é : a tricks, puzzles telegraph apparatum, NIU /Ş anywhere. Lots of fun fooling $ books ote, 10e. á if 5 i belle mionetslightasclectria A teacher, policeman or friends, T mie Piee] RNC THE VENTRILO a little instrument, fits in the mouth out of si ht, used with above for Bird Calls, etc. Anyone can use it. Never falls. A16-page course on [EA Ventriloquism together with the Rea Ventrilo. All for 10c postpaid. Subscribe to our Monthly Magazine FUN, MAGIC AND MYSTERY | We also publish a monthly magazine of FUN, MAGIC AND MYSTERY. Each i| issue contains a big collection of parlor || magic, tricks with cards, fortune-telling, funny readings, amusing experiments, j| money-making secrets, jokes, riddles, conundrums, parlor amusements, puzzles, problems, science, mechanics, etc. In add- 326 Jokes and Riddles, 25 Magic Tricks, j ition it will list all the latest novelties, 10 Parlor Games, 73 Toasts, 13 Fair. > tricks, puzzles, etc. Because itis really a Tales, 105 Money-making Secrets, pr N : magazine and catalog combined, we have Monologues, 1 Fussieg, and Problems, 232: io |! 4 fixed the subscription price at ONLY 10c 11 Parlor Pastimes, 13 Flirtations, Ti ; am me jPer year, or 3 years for 25c. This as you readily see does Girls and Boys Names and their Meane : not even cover our mailing expenses, let alone the cost of ings, {0 Picture Puzzles, 69 Amusing getting up the magazine. Try this magazine for one year. Rhymes, 37 Amusing Experiments, Deaf and Dumb Alphabet, Shadowgraphy, ee ae eee eee Gypsy Fortune Teller, How to tell Fortunes with Cards, Dice, Dominoes, Crystal, | Ho i Written by a card sharper. Tells how to win at draw Cotte Cup, ete., Hypnotism, Ventriloquism, Cut-outs for Checkers and Chess, w to Win at Roker, Explains diderent varicties of poker such es Dominoes, Fox and Geese, 9 Men Morris, Spanish Prison Puzzle, Game of Ana- treight Poker. Sud Toker, Whiskey Poker. Misti- grams, 25 Card Tricks, Crystal Gazing etc. ALL FOR 15 CENTS POSTPAID Efe. Exposes the methods used by card sharpers aud NEW _VAMPING | CARD NO TEACHER NEEDED--SURPRISINGLY SIMPLE SYSTEM Persons having neglected their Musical Education need not despair, for with the aid of our new VAMPING CARD (placing the card upright over tho piano keys), you can Vamp away to thousands of Songs, Ballads, Waltzes, Rag Time, etc., etc. No knowledge of music is required. After using it a few times, you wll be able to dispense with the aid of the Vamplng Card entirely, The prica of this very clever invention is only 15c postpald. BIG ENTERTAINER FUN, MAGIC and MYSTERY mmoth 710 e Catalo: 7 i fe al bilers. 13 Chapters. Thls book con- SORA 710 Prge See toi Af novelties, Jokes. tricka; puzzles, ate: 10. Genis: e intormance aad mey eave you from being fleeced by crooked players and gamblers. PRICE 10c postpaid. 710 page Novelty Catalog 10a RACINE, WIS. How to Pitch Real Curves Pitch the Fade-a-way, Spitter, Knuckler, E ook ere rata cloth binding 2 N a Smoke Ball, etc. Lessons by leading Big A |a marcic. the newe, XN League Pitchers. Clearly illustrated and stamps, unueua aai pl described with 56 pictures. Only 25c f Paineis Gnuzed US Pas Stam “3 Shove! Canadian Toney, stamps and’ Postal Noles accected an curreat rate of Exchanse: gee Johnson Smith Co. Dep. 719 Racine Wis- a Address orders for all goods on above page to JOHNSON SMITH & CO., Dept. 719, Racine, Wis. Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers — 21

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Classified Advertisement Rates for classified ads, 10¢ per word per Insertion. Minimum 10 words, Cash should accompany order, Closing date first of second month preceding date of issue. Address Classified Mor., Modern Mechanix and Inventions, 529 7th St. So., Minneapolls, Minn. 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 S. Hoyne Ave., Chicago, : ADVERTISING AGENCIES ADVERTISE: $15 reaches 6,000,000 readers with 24 word ad. Newspaper mail-order magazine Rate-Guide, free. Chicago Advertising Agency, 22 West Jackson, Chicago. FREE NEW advertisers rate guide. Brown. Advertising Agency, 140 South Dearborn, Chicago. ADVERTISE: 24 words in 250 news- papers $10, Lists Free. Advertising Service Bureau, 4650 Drexel, Chicago. AGENTS FREE Literature describing many busi- ness plans. D-Belfort, 4042 N. Keeler, Chicago. 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. BEST Sellers; Cigars, Gum, Latex; Carded Goods, Incense, Toiletries, Nec- essities, Blades 60c hundred; Samples, Catalog 10c. Easterncity Sales, Capitol Bldg., Chicago. AGENTS WANTED AGENTS’ Gold Sign Letters for store windows. 500% profit. Free sample. Metallic Letter Co., 426 N. Clark, Chicago. ` BIG money easily made—in home, office, business of your own, without peddling, little or no investment. Free particulars. Mayrer, 1435 Gunhill Road, Bronx, New York. AGENTS: Smash go prices! Santos coffee 12c lb, 4-oz. vanilla 814c. $1.00 size Tonic 14c. Razor Blades 5 for 834e. 100 sticks chewing gum 12c. 150 other bargains, Experience unneces- sary. Write, Carnation Co., MN, St. Louis, Missouri. 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. CASH income daily resilvering mirrors at.home. Replating autolight reflectors, tableware, etc., outht furnished: Write Sprinkle, Plater, 850 Marion, Indiana. MAKE MORE Money selling shirts, ties, underwear, dresses, hosiery, rain- coats, coveralls, pants, uniforms, play- suits. Outfit Free. Nimrod Company, Department 132, 4922-28 Lincoln Ave- nue,. Chicago. BIG MONEY applying gold initials on automobiles. Easiest thing today. No ex- perience needed. Free samples. “Ralco,” 1084 Washington, Boston, Mass. LIBERTY bell paper weight novelty. Sample and plan, 25 cents. Shemorry, Williston, N. Dak. furnished; free particulars. ‘Co., Ave. A, Decatur, Ql. ‘PENNY each, any size! ‘sign letters. AGENTS WANTED BIG Money for you. Make, sell, print- i Tremendous market. Learn amazingly easy copyrighted process. Free specimens. Hughes Prod- ucts, 52. Miami, Terrace Park, Ohio. GOOD Income Plating Auto parts, re- flectors, mirrors, by new method. Outfits Gunmetal Gold window 2500% Profit. Easily ap- plied. Free samples. Atlas Sign Works, 7941-G, Halsted, Chicago. ATTENTION, men and women, earn $18-$25 weekly. Approved instructions sent for 25c. Emanuel Guastella, 690 Ogden Street, Bridgeport, Conn. clothing. 100% to 300% profit. faction guaranteed. We start _ you. Ideal Rummage Sale Co., MC-3206 State, Chicago. NEW reference book used by students business men, and homes. Saves mental effort. Interesting proposition. Page 16. 500% PROFIT! Gold and colored sign letters for windows; offices, trucks, signs, Monograms. Easily applied. Neonite, Akron, Ohio. EASY Direction Finder Patents, Can- ada, U.S.A. Accurate, simple operat- ing; snowy, foggy weather, heavy timber country; for hunters, trappers, prospec- tors, timber cruisers, hikers, aviation, Mounted Police, military, Boy Scouts, achting, Arctic exploration, etc. Also: Yilustrated use watch as compass. Com- plete outfit 14% oz. carried vest pocket. Money refunded if not as represented. Canada 75c; U.S.A. $1.00. Agents wanted. Max Lohbrunner, 1245 Domin- ion Rd., Victoria, B.C., Canada. AUTO SUPPLIES OLD SPARK Plugs worth 3c each. Large company rebuilds. Work your- self, or have boys collect. Selling, col- lecting, shipping, instructions 25c coin. Hammond Co., Box 71, Paulding, Ohio. MIDGET Auto Supplies—Blueprints to completed cars. Catalog 10c. Paul Shipps, South River Road, Zanesville, io. AVIATION .LORENZEN Propeller for your air- ‘plane will increase performance, The Race Pilots’ choice. New Circular, dime. Lorenzen Propeller Company, Niles, Michigan. 7 Ft. GAS Powered model planes, K. D. Kit complete, less motor, $8.00 prepaid. Blueprints $1.00. 1/6 H.P. gas engine turns 16” prop. 4325 R.P.M. Complete catalog 25c coin. P. Loutrel, 96 Me- Donough St., Brooklyn, N. Y. DON’T Buy anything until you get Ort’s 1934 Aviation Material Catalogue. Prices are lower. Send one thin dime today. Karl Ort, 706 W. Poplar, York, Pennsylvania. NEW PRICES on lightplanes, engines, ropellers, blue prints, hubs, wheels for, ightplanes, boats, midget cars. Circu- lars 10c. Storms Aviation Ço., 88 Char- lotte St., Asheville, N. C. AVIATION RECRUITS—Airminded young men wishing to become eligible for free flying training as cadets in the army air corps. Enclose 20c for “qualifications” form and complete information. No political or social influence necessary to secure appointments. Midwestern Aviation, Div. B-12883 Mansfeld, Detroit, Mich. USED Airplanes $85 and up. Catalog 10c, Federal Equipment, Deerpark, Ohio. AVIATION Jokes, stories bought; 20c brings particulars, Leo Gille, Seminole, Okla. ARMY Air Corps gives one year free flying course, 250 hours solo flying, salary while learning, Send 20c for in- formation booklet telling how to quali- fy and apply. Federal Equipment Co., Deerpark, Ohio. METAL tipped propellers; Fords, $9.98; Henderson, $8.50; Harley, un- tipped, $4.50; New production ships, $98.00; Aeronca Type 40 H.P. motors, $93.00, including propeller. Photos, in- formation including leather bound flying manual, 25c. Hibbs, Ft. Worth, Texas. BATTERIES sands can be put into service. 25¢ for formula, instructions, catalog of molds and particulars. Home Occu- pations, St. Paul, Minn. LEAD Storage Battery. ` Complete course in battery manufacture, repair and maintenance; 215 illustrations. $3 postfree, 5 days money-back guarantee, Arndt, 1808 Bronson, Hollywood, Calif. BLUEPRINTS FORECAST the weather 8 to 24. hours ahead. Make your own mercury barom- eter. Make and sell them. Paste 25c to order for plans and instructions. Cayuga Plan Co., Box 43, Aurora, N: Y. BAND SAW, no castings, no machin- ing drawings and instructions, $1.00 postpaid. Iachinecraft, Box 384, Springfield, Ohio. BOAT blueprint, cheap. Roclaw & Zenew, 708 18th Ave., Irvington, N. J. BOAT BUILDING BUILD your own boat and save two- thirds, using our complete frames and materials. Tell us requirements and let us quote. Large free catalog shows everything from a runabout to a 75 foot cruiser, sailboat or workboat. Bay City Boats, 1553 Adams St., Bay City, Mich. BOOKS FOR SALE MULTIPLICATION and division now easy. Dictionary of numbers. Page 16. BOXING LEARN boxing. Complete illustrated instructions 25c. Wrestling 25c. Jiu- Jitsu 25c. Prof. Dryer, Box 1850, Chicago. BUSINESS OPPORTUNITIES INCOME without investment. Unusual opportunity. Details 10c, Mailway Sys- tem, 1418 Peden, Houston, Texas. HANDY MEN—earn money at home repairing vacuum cleaners. Write W. Staford, Makanda, Illinois. 0 ED 22 Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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BUSINESS OPPORTUNITIES MAKE Artificial Marble, glazed tiles, no ‘polishing, uncanny. Tabletops, book- ends, floors, whetstones. Inexpensive, hard, enamels wood. Rubber moulds for exquisite novelties. Secret cement pro- cesses. Colorful samples free. (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. MEN—WOMEN interested money _ home, write for details. F-277 Broadway, New Yor DISTRIBUTOR: Protected territory. New invention. Piston rings. Saves re- boring. Requires $100 to $500 for mer- chandise. Steeloraft Corporation, 5716 Cass Ave., Detroit, Mich. earning Eller, DOLLARS in instruct. Particulars. “Fixit” Service. dena, California. START local business with self-seller. No salesmanship required. Big money. 25c (coin). Gardar, 3026 10th Ave., “Fixit” Service. everyone. Enormous profits guaranteed. No capital needed. Write E. Mitchell 233 Gholson Ave., Henderson, N. C CARTOONISTS—Big Money. Write mick. Straley Studios, 134M Main, Springfield, Ohio. Gold, silver and nickel plating without electricity. Rush coin for instructions and formulas. Acme Process. Box 685, Dayton, Ohio. ATTENTION! $27.00 weekly operat- ing newspaper clipping bureau. lete instructions 25¢ cash. Fireside, oyal Oak. Mich. - HOME Industries, Irvington, Nebras- ka, Bi-Monthly, 32 pages, three months 10e. COMPLETE Chemical Service, Analy- i Formulas, Consultations. State i Twenty-five years RECEIVE 100 letters daily, each con- taining a dime. Instructions 10c. G. Maas, 3610 N. Cicero Ave., Chicago, Illinois. BRAND NEW money making ideas. Clever merchandising schemes, i order business plans and advertising stunts. Details 10c. Mailway System, 1418 Peden, Houston, Texas. WISE MEN Get Money Easy! Plan 10c. “Mooremade,” Lapeer, Mich. TATTOOING Outfits, Supplies—Cata- logue. Guaranteed Remover. “Waters,” M-965 Putnam, Detroit. AMATEUR cartoonists, earn $25.00 week, spare time, copying cartoons for advertisers. Three-M Syndicate, Argyle, Wis. MAKE $5 a day in any depression. No selling, nothing to buy. Complete information. 25c (coin) Curtis, Box 126, Mar Vista, Calif. $$$ $40,000—I made it. Plan 10c. “MooreMade,” Lapeer, Mich. SELL formulas. No capital needed. Trade secret $1.00. Barrett, 2422 Zim- merman, Flint, Mich. HD Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 2 -can duplicate for 50c. Large profits.- BUSINESS OPPORTUNITIES THE PLASTEX Industry needs manu- facturers on small scale and for big pro- duction of Art Goods, Novelties, Souve- nirs, etc. in Plastex and Marble imita- tion. Experience unnecessary. 2¢ ma- terial makes 25c articles. Rubber moulds furnished for speed production. We place orders and buy goods. Small in- vestment brings big returns. Interest- ing booklet mailed free. Plastex Indus- tries, Dept. R, 1085 Washington Ave., New York. OPERATE Chain of vending and amusement machines. Be independent for life. Start small, grow big. M. Goodbody, 1826 East Main St., Roches- ter, Y. SELL by Mail. Books, Novelties, Bar- gains! Large Profits. Particulars free. H. Elfco, 525-S Dearborn, Chicago. - LIQUID Marble—Anyone can make! Molded, brushed, or sprayed. Colorful, Glossy! Rubberlastic Molds. Composi- tion Flooring. Big Money making these. Particulars Free. Marbleizing Service, Edwardsville, Illinois. e a ee a aE DISCONTINUING Business! Will sell 10 tested-guaranteed cosmetic formulas for $1.00. Real bargain. Christine Laboratories, 1042 Corwin Ave., Akron, Ohio. OPERATE a Collection-Adjustment Bureau, Opportunity everywhere. Easily learned. Write Cole Associates, Tower, Syracuse, New York. NOVELTY makers: learn marbleizing. Why pay $10.00 for molds that you l Casts resemble polished, marble. Wonderful opportu- nity. Big profts. Dime brings samples. Cowell Institute, Grayling, Mich. CLEAN outdoor summer work for un- employed men and students. A real Money-maker. Discovered by the un- employed. Proved in 1933. Ready for 1934—and You. Instructions25c (coin). Instrux U Rit Service, Box 116A, Mosinee, Wisconsin. PROFITABLE Ideas. Greatest of all collection of money making information! Improve your financial condition! This book shows you the way. Price $1.00 postpaid. Hafernik, Box 132, Corpus Christi, Texas. ARTIFICIAL marble formulas. 3 for 25c. Johnson, 4520 Christiana, Chicago. WE HAVE an opportunity for oppor- tunity seekers. A start for mail order beginners and more profit for estab- lished mailers. 3c brings easy plan. “S” Mail Service, 432 Jackson, San- dusky, Ohio. IF YOU know of any better money maker than our new dime seller, tell us. Three samples for quarter, no stamps, twenty for dollar. “If you don’t make money, neither do we.” Williams Sales Co., Box 4100, Portland, Oregon, Mem- her N.R.A. g MAKE Money at Home full or part time. Big pay. Men or women. Ex- perience not necessary. Write Easy Platers, Dept. 25, Drawer Y, Chicago. SUCCEED With Your Products. For- mulas. Processes. Analytical Service. Catalog ae A. Thaxly Co., Washing- ton, D. C. MAKE PRODUCTS yourself. Tested formulas, Catalog free. Grinstead Lab- oratory, Edwardsville, Illinois. PROFITS! Generous, expanding, no soliciting. Men, women, startling facts! McArthur Co., Desk 19, Butte, Mon- tana. CARTOONING TRANSFER pictures or sketches on wood or cloth, 10c. Burns, Box 304, Somerville, N. J. CAMERAS AND PHOTO SUPPLIES 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. 2047, 3601 Mishigan Avenue, Chicago. CARNIVAL GAMES MAKE you money—Outfits supplied, catalog 10c. ‘'Mooremade”, Michigan. CASH FOR IDEAS WANTED ideas for Novelties, games, puzzles, that can be manufactured in paper box form. Will buy outright or pay royalty if accepted. Kroeck Co., 1705 W. Superior, Chicago. CHALK TALK STUNTS LAUGH Producing Program, $1.00. Catalog Free. Balda Art Service, Dept, 65, Oshkosh, Wis. CHARTERS DELAWARE. Charters; fees small; free forms. C. Grant Guyer, 901 Market St., Wilmington, Del. M CHEMISTRY EXPERIMENTERS — Students —Join Amateur Chemists, Membership and 1013 High, Petersburg, magazine 20c. Virginia. DETECTIVES DETECTIVES. Make Secret Inves- tigations. Experience unnecessary. De- tective Particulars free, Write, George Wagner, 2640-V Broadway, N. Y. BE A Detective. Make secret investi- ations. Experience unnecessary. Write nited Detective System, 1623 Grand, Chicago. BECOME a successful detective. Ex- perience unnecessary. Detective paper and particulars free. National Detec- tive System, Dept. D, 340 Electric Bldg., Omaha, Nebraska, money instantly. 25c. Fedworks, Nebraska. 1721 DUPLICATORS DUPLICATING Machines $3.85 to $95, Rotary Stencil, Clay Composition, Gelatin Film. Most Complete Line in America. Photo-Litho Folder Free. Pittsburgh Typewriter Supply, Suite 551, Pittsburgh, Pa. you can build yourself at low cost. Free information. J. Egemeier, 56 Lin- den, Ossining, N. Y. DUPLICATORS & DEVICES STENCIL Duplicator—Anyone c make! Particulars Free. Rapid Service, Edwardsville, Illinois. EDUCATION TRAINING -WANTED—Names of Men Desiring Steady outdoor jobs; $1700-$2400 year; vacation, Patrol parks; protect game. Write immediately. Delmar Institute, B-32, Denver, Colorado. STUDY Law at home. Unusual oppor- tunity. Act now and get ahead. Com- plete. Prepaid $2. Andrew Fisk, Box 184, McKeesport, Pa. ELECTRICAL EXPERIMENTERS EDUCATIONAL, Entertaining. Elec- trical laboratory experimental kits, six- teen valuable pieces, $4.89. Seven piece kits, $1.77. Hand driven A.C. genera- tors, 91c. Microphones, 44c. Detecto- phone kits, $1.74, etc. Instructions with all. No toys (Western Electric, Kellogg, Stromberg-Carlson salvage equipment). Jewell meters. Bargain bulletin, stamp. Engineering Service Company, 3724 ‘A’ Street, Lincoln, Nebraska. Oo

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ELECTRICAL APPARATUS BANKRUPT Stock—950 electrical ex- perimental kits—designed for 110 volts AC—kit makes motors, telephones, de- tectophones, burglar alarms, arc lights, etc.—Original cost $10.00—Sales price $1.99—Other outstanding electrical and radio bargains—Greatest values in his- tory of salvage sales. Catalog—Stamp. Lincoin Engineering Company, 855 Z, South 37th. St., Lincoln, Nebraska, ELECTRIC EYE ELECTRIC EYE—40c builds it. Hun- dreds of fascinating experiments, Plans 25c coin. Albers: Experimental Labora- tory, 3834 Humphrey Str., St. Louis, 0. i $ FALLING HAIR BALD? Hair falling? Healthco Hair Grower stops falling hair, cures itching scalp and‘dandruff. Large box $1. (Two months shampoos free). Trial size 25c. Healthco, Box 334, Shamokin, Penna. FOR BOYS & GIRLS HIGH SCHOOL, college students. Make, sell inks. Big profits. Formulas, novel, easy selling plan $1.00. Pint sample, particulars 2k . Fran Pelishek, ell, Wisconsin. FOR EXPERIMENTERS FREE! Book of Fascinating Chemical Experiments, and “Sciencecraft” maga- zine Free for 6 months! Send_stamp. Sciencecraft, M-5049 Bernard, Chicago. FOR INVENTORS HAVE you a sound, practical invention for sale, patented or unpatented? If so, write Chartered Institute, 502 Bar- rister Building, Washington, D. C. : FORMULAS 3,000 FORMULAS, facts, processes, trade secrets:in Dr. Brown’s Book of Formulas, 380 pages. Price, postpaid 21:00; Ogilvie Publishing Co., 57 Rose treet, Dept. 4, New York. SUCCEED With Your Products. For- mulas. Processes. Analytical Service. Catalog free. A. Thaxly Co., Washing- ton. D. C. TESTED FORMULAS. Newest, guar- anteed! Catalog free. Grinstead Labor- atory, Edwardsville, Tlinois. FORMULA Special — Mending Fluid, Plastic Wood, Plastic Leather, 30c each. Others. Investigate. Halspence Ex- change, 561 E. 89th St., Brooklyn, N. Y. Catalog Free. Bestovall, 4047-M North Whipple. Chicago. FORMULAS, Imitation Ruby, Emerald, -Topaz, Sapphire, Gold and Silver Amalgam, for mirrors, etc., $2.00. A, C. Hackett, Jr., Hartsville, Tenn., Dept. C. FORMULAS—Interesting Literature e D-Belfort, 4042 N. Keeler, Chicago. FREE Formula literature, 465 formulas 25c. Thomsoñ’s Service, 7309 Pingree, Chicago. ANY Formula or Process, 25 cents. Analytical service. Church & Galle Laboratories, Marissa, Ill. MANUFACTURING Chemist furnish- es newest formulas 3 for $1.00. Lists free, Merritt, 1526 Diamond, South Pasadena, Calif. FOR SALE MANUFACTURERS—New improved electrical plug and outlet. Robert Wil- kins, 2350 N. Gale, Indianapolis. G-L AUTOMOBILES MODEL A Ford Racers — Photos, prices, specifications, 20c. Forrest Win- chel, 3322 Broadview Rd., Cleveland, GENERATORS D. C. GENERATORS 110 voit $2.50. Hoge, 5348 Cornelia Ave., Chicago. HELP WANTED WANTED immediately, men-women, age 18 to 50, qualify for steady U. S. government jobs; commence $105-$175 month, Common education. Valuable information free. Write, Instruction Bureau, 234, St. Louis, Mo., today. JOB SEEKERS and. salesmen: Learn roper approach in seeking employment, fasi principles of sales psychology, ete: Treatise compiled from hints by suc- cessful executives, price $1.00. Data Service, 3002 Monroe, Kansas City, Missouri. HOME DENTISTRY FIX YOUR own teeth, tooth cavities painlessly, easily. Send 55c complete outfit. Dentalco, 287 Spa- dina Ave., Toronto, Ont. HYPNOTISM HYPNOTIZE instantaneously! New dollar book 25c. Lonk Institute Hypno- tism, D-1313, Palatine, Illinois. INVENTORS INVENTORS—Sell your inventions before patenting. Free particulars. Write W. T. Greene, 942 Barrister- Building, Washington, D. C INVENTORS—Large lst, inventions: buyers and wanted inventions, 25¢-coin. Albers Experimental Laboratory, 3834 |. F. Humphrey Str., St. Louis, INVENTIONS Mo. ented or unpatented. t Fisher Mfg. Co., 582 Enright, St. Louis, Missouri. INVENTIONS — Patented, Unpatent- ed. We buy outright, royalty. Grant- Dacanay Co., Hewes Building, San Francisco, California. HOUSEHOLD Inventions wanted. We can help you Protect, Develop and Sell any invention. Roesch Inc., 120 E. Washington Street, Syra- cuse, New York. INVENTIONS wanted, patented, un- patented, Bosley Manufacturing Cor- poration, 79 High, Torrington, Conn. SMALL INVENTIONS Wanted, A. Hull, 7829 Euclid Avenue, Cleveland, H., St. Louis, Mo. INVENTIONS perfected by capable de- velopment engineer. For thè best work- tors Engineering Service, 940 Thomas, St. Paul, Minn. INVENTIONS bought and sold—Na- |, tional Inventors Congress, Hotel Fon- |! tropicals, tenelle, Omaha, Neb. Write now for details, JEWELRY LEARN Watchmaking. Practice move- ment, instructions, 50c. Dozen experi- mental movements, $1.50. Repair any watch, $2.50. Catalog, 5c. Carleton Building, St. Louis, Missouri. KEYS TWO DUPLICATES any key, 25c. ease, 512 E. Green, Champaign, MACHINERY, TOOLS AND SUPPLIES HARD to get supplies; hardware; tools. Catalog 10c. Kostka, 2358-B South Crawford, Chicago. TOOL grinder and disc sander com- bined complete with wheels $5.25. Disc sander 8’? direct for motor shaft $2.20 ost paid. ‘Home work machinery ought, repaired and sold. S. & B. Sales Co., Newton, Iowa. “Toothfix” fills. Associates, -Send: $1.00 for Dantum, postpaid. 7 3 s | PRACTICAL Electric Sander, ing drawings and models write, Inven- |. i i i for stamp. Stewart’s, |: MAGIC CURIOUS Books, Magic, Herbs, Nov- elties. 132-page Catalog 10c. Morrelle, 159-NOM State, Chicago. MALE HELP WANTED _ FOREST JOBS. easily available, $200 month; Cabin. Hunt, trap, patrol. Get details immediately, Rayson- Service, K-32,. Denver, Colorado. BRAND NEW Factory -to -Consumer Business. Be first in your neighborhood to cash in. Unusual chance to make $32.50'a week, Experience unnecessary. Rush_-postcard for details. Albert Mills, 4510: Monmouth, Cincinnati; Chio. MEN or Woment 'Look-after local Coffee and Téa Route. Calt-on-homes with 300 highest. quality. necessities. Spare or full time. No investment. Permanent. Pay starts immediately. Bright future. Blair Laboratories, Dept. T-4, Lynch- birg, Va. MEN WANTING jobs on new con- struction work in U. S., So. America, write E. Moore, 1848- Hunter Bldg., Chicago. Enclése: stamp. MEN WANTED at once to call on stores with newest. line self-selling 5c and 10c necessities. Strong, original counter displays. Aspirin, Mercuro- chrome, razor blades, Household cement, etc. Automatic sellers; Many new items. Up to 125% profit. Big catalog ree. Procopax, Dept. 95-W, 1956 S. ‘Troy, Chicago. 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 ULTRA-LENS _ pocket Microscope, 500X magnification (250,000 areas) 50c postpaid. Pfleegor, Milton, Pa. MISCELLANEOUS FINANCIAL Independence. Particu-. lars for stamp. Gardar, 3026 10th Ave., Los Angeles. “EASY: Opener Envelopes. Saves time. . J. Hobson, Healdsburg, “DANDRUFF positively removed by using Dantum. Results’ guaranteed. Dan- tum Products, 739. N. Troy St., Chicago. You Details labeled—25c. r Wood Service, 6602 South Richmond, Chicago. WE BUY almost everything—Broken jewelry, coins, gold teeth, silverware, . Cash by return mail. Schiller’s, 444 9th St. N. W., Washington, D. C. hair-splitting edge, 1c each. Petter G. Wetterquist, Rockford, Illinois. MODEL BOATS MODEL yachts;. plans, gas engines. Circular 10e. Model Yacht Builders, Box- 999, Milwaukee, Wisconsin. MODELS & MODEL SUPPLIES BIG - New - Catalogs - No. 34. Engines, Models, Machinery, Castings, Blue- prints. No. 35. Materials-Supplies. Ei- ther postpaid 20c, coin or stamps. For- eign countries, 30c. Refunded first order. Illustrated: circular Free. Evray Me- chanics Supply Co., 28 N. Clinton St., Chicago. TD 8 = bo 4 Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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MODELS I 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. . Send for catalog. The Pierce Model Works, Tin- ley Park, Il. MOTOR WINDING DATA MOTOR winders: winding data, 100 A.C. motors, special selection, various horsepower and voltage, $1.00. Motor Data Service, 3002 Monroe, City, Missouri. MOTION PICTURES LEARN Motion Picture Theatre Busi- ness. Catalog M. Free. Theatre Insti- tute, Elmira, N. Y. MOTORCYCLES SEND 15e for illustrated used Motor- cycle catalog. Large stock. Bargains. Indian parts. Accessories. Indian Mo- torcycle Sales, Kansas City, Missouri. MOVIE CAMERAS Kansas $1.00, 100° ft. Mogull Bros., 144-G, Boston Road, N. Y. C. OLD GOLD WANTED HIGHEST PRICES paid for gold teeth, discarded ier rings, ete. Horton Co., 3016 University Ave. S. E., Minneapolis, Minn. U. S. GOVERNMENT licensed gold buyer pays highest prices for anything containing gold. All Rinds broken watch- es, jewelry, gold teeth, etc., bought. Send packages insured mail. Dobrin, 4917 Oliver So., Minneapolis, Minn. PATENTS PATENT your idea. Other men have read and profited by our free book, “How to Obtain a Patent.” Fully ex- plains many interesting points to in- ventors and illustrates important mech- anical and electrical principles. With book we also send free “Record of In- vention” form, Prompt service, reason- able fees, deferred payments, thirty-five vears’ experience. Avoid risk of delay. Write immediately to: Victor J. Evans & Co., Registered Patent Attorneys, 647E. Victor Bldg., Washington, D. C. PATENTS—Reasonable terms. Book and advice free. L. F. Randolph, Dept. 341, Washington, D. C. INVENTIONS Commercialized. Pat- ented or unpatented., Write Adam Fisher Mfg. Co., 582 Enright, St. Louis, Missouri. GET your own patents; legal blanks, complete instructions $1. Cudding Sons, Campbell, Calif. PATENTS. Booklet free. Highest references. Best results. Reasonable fees. Watson E. Coleman, Victor Build- ing, Washington, D. C. PATENTS FOR SALE RECENTLY patented “Servant’s Door Lock,” for early admission of maid or cook, affords good house protection. K. C. McGee, Laurel Hill, N. C. “A Dancing Manikin,” that actually dances, human in shape and action, fine for advertising purposes. Cash or Roy- alty Contracts. Communicate, K. McGee, Laurel Hill, N. C. NOW possible to make present double hung windows revolve on pivot, and weatherproof. Patent 1896559. Zan Ruchin, Bayshore, N. Y. : Q PATENT ATTORNEYS 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 hase 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-A, Adams Building, Washington, D. C. INVENT something! New discoveries have cured previous depressions. Un- atented ideas can be sold. I tell you ow and help you make the sale. Free particulars. Write W. T. Greene, 958 Barrister Building, Washington. D. C. PERSONAL PALMISTRY—The science the colleges neglected. Handbook 125 pages, 1000 markings explained. Postpaid $1. Chiro- mant, 1539 West 7th, Los Angeles. RELIABLE information, any_ subject, $1.00 up. National Bureau of Informa- tion, Cedar Rapids, Iowa. GREAT strength easily obtained, de- tails free. Prof. Dryer, Box 1850-R, Chicago. LANGUAGES Self taught, 25c coin. James Schuster, Hatley, Wisc., Box 56. PHOTO DEVELOPING FILMS developed 5e per roll; prints 3c each. Ask for Special Bargain List. Roanoke Photo Finishing Company, 159 Bell Avenue, Roanoke, Va. 8x10 ENLARGEMENT 25c; 5x7—10ce; developing roll film—5c; prints 3 cents each. Cardinal Photo, Summit, N. J. CONFIDENTIAL films developed and printed. Twenty-five cents per roll. One enlargement free. Work and delivery guaranteed. M. Johnson, 10120 Ave. J. So. Chicago, Tl. PISTONS ALLOY Pistons. Harley, Henderson, Indian, Excelsior. Used parts, catalogue and wings pin 10c. Ballak, 100 N. 12th, St. Louis, Mo. POTTERY MAKE Colored pottery and art novel- ties for quick returns. Permanent. Easily made. Sell for 5 times cost, Book- let free. Colorcrete Ind., Holland, Mich. PRINTING FOUR color, 314x11 letterheads, en- velopes; 250 each $1.85 postpaid. Kolor- print, 7214 Duluth, Cleveland, Ohio. 500 814x11 BOND letterheads, $1.25; 500 Fine quality envelopes, $1.25; 500 Best grade cards, $1.25. Free Cuts any subject. Thayer, Gassaway. W. Va. RACE CARS AND EQUIPMENT MODEL A Ford Motor Miller D. ©. Head, $750. 375” Miller 8 Motor $500. One man race car Auburn $250. One man racing chassis Class A $500. One man racing chassis Class B $150, New and used heads, cams, carburetors, side drives, motors. Let us know what you want. Buschman & Schafer, 2349 15th Ave., San Francisco, Calif. RADIO NEON Tube, 12 inches long, for test- ing, experimenting. Fifty cents post- paid with instructions. Commercial Neon, 1522 No. 33, Omaha, Nebraska. 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. RADIO NEW! DIFFERENT! AUTOMATIC Time Switch. Turns radios, electrical appliances on or off any desired time. Never fails. Easily made for few cents. Illustrated Instructions 20c. Box 232, Newark, New Jersey. GUARANTEED pocket radio, $2.00. C.O.D. Shipments made. Catalogue, 10c. Neil Tasker, Shamokin, Pennsyl- vania, SHORT Wave Sets, Kits, Supplies. 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. RUBBER STAMPS Profitable; easy. Instructions 2 dimes coin. P. O. Box 214, Portland, Arkansas. SALESMEN WANTED 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-5. Chicago. SAW SHIELD CARPENTERS: send 50 cents for our hand saw shield, three for $1. Repre- sent us in your territory. H. Longen- ecker, Greenville, Ohio. g SPECTROSCOPES VERY powerful. Shows moon’s rain- bow, sun’s double sodium line, brilliant spectra of elements. New Invention, postpaid $2.50. Cutting Sons, Campbell. Cali i | STRENGTH DEVELOPMENT Costs 8 cents, sells ‘for 35 cents. Actual size, detailed draw- ings, instructions, 25 cents silver. Box A012, Hendersonville, No. Carolina. TRAILERS ae ee BOOK of camp trailer plans containing 15 modern designs ranging from 8 to 16 feet, copy sent postpaid for $1.00. Toellen Trailer Service, Box 25, College Park Sta., Detroit, Mich. VENTRILOQUISTS ae S LEARN Ventriloquism by mail; small cost, 3c stamp brings particulars. Geo. W. Smith, 125 North Jefferson, Room 601, Peoria, Ill. WANTED TO BUY UP TO $20 each paid for Indian head cents; half cents $125; large copper cents $500, etc. Send dime for list. Romanos’, Springfield. Mass. i WELDING ARC-WELDING outfit $1.10. Weld fenders, braze, solder. Lavrow, 4368-W. Warren, Detroit. Stamp appreciated. 9 hn ID OF Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 25

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EN xs Ss < E LEC B i 4 iw , A PE FREE - A-:C-RADIO TELEVISION EVERY ELECTRICAL F SUBJECT COVERED Hère’s: great-news for anybody:interested in Electricity, BRAND NEW: edition- of. Applied’ Etlèctricity brought right down to date: with: every: NEW Electrical: subject fully covered. 10 big Volumes and: al} shipped: FREE for examination. BIG. FIELD! Big Demand! ae z Men who understand electricity Big Pay! are urgently needed right: now

: For Beginners an Experts jo:mocmmy- in thousands of industries. Autos, airplanes, pages— hundreds- $: machine shops~ practically every. industry depends- of illustrations — on electricity and men who, know. this. subject! make . the most complete big-money: . Pleasant, fascinating work,.easy. to learn work of its: kind: and do; learn quickly with these books, Send coupon ever published. for a set for FREE examination anā sec for yourself. Dynamos; motors, ‘A year’s congultigg, membership" power stations, in-the: American Technical So- ' radios, television, | ciety. now given free to al) read- everything elec- 3 ers of this famous: Cyclopedia of trical explained’ Electricity: Many say,''That’s ] clèarly so, anyone : ‘worth more than cost of books.’’ an: understand ~ them: AMERICAN TECHNICAL SOCIETY Dept. E 5320, Drexel at 58th St. Chicago SL ce SS es ce es A American Technical Society, Dept. E5320, Drexel at‘S8th St., Chicago Send for 10 days’ free use, BRAND NEW 10 volume set of Electrical Engineering. In return for mailing this coupon promptly; send ‘free, certificate» of membership inthe American Technical ‘Society: entitling me to full: consulting privilege for one year. Iwill pay the few cents delivery charges on the books, If I wish I may return them in 10 days'and owe you nothing; but if I keep them I will send $2.00 after 10 days; then $3.00'a month until the special price of only $29.80 is paid. Oity.——~———_ -— == =~ e n E T Statec— 2 oa ey Attach letter.stating age, occupation and name and address‘of employer and at least one business man as reference, PRECISION 30 ' RACK POWER: ano PINion MICROSCOPE , Ab unusual combination of precision and low price, this substantially made instrument includes every refinement desired by the amateur micro- scopist, such as finely geared, smoothly functioning rack and pinion focusing, tilting stand, adjustable mirror re- movable for examination of objects by direct light, large stage, nickeled tubes and compound objective lenses. Complete ‘with 1 prepared and 2 plain slides, dissecting needis, Similar put without rac 2.98 Precision Optical Co. , Dept. 35, 991 East 163d St., New York AIR CONDITIONING y Air CONDITIONING is the next big indus- try. Mark that pre- diction! Its oppor- tunities are as big in winter as in sum- mer. Plumbing and heating engineers must know Air Conditioning —the field in its broader aspects invites ambi- tious men. And a new, up-to-the-minute. course on. Air Conditioning now offered by the I. C. S. will help you qualify for advancement in this . new field, Full information — free.

ACNE TANE BOX 2318-W, SCRANTON, PA, Explain fully about your coursein thesubject marked X¢ HAIR CONDITIONING: O Chemistry. EO Accountancy E'Radio D'Advertising | ED: Aviation O'Electrical Engineering D Refrigeration, Di Inventing & Patenting O-Architecture © Drafting Show Card. Lettering £ Good English

: Back-Geared, Screw Cutting, Metal*Working Bench i Eathe with automatic longitudinal feed; graduated i less motor | Easy terms

BUILD A FRONT DRIVE!| The construction. ef a real

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The 9x3’ No. 5 “WORKSHOP” LATHE is a compound rest; hollow headstock spindle;.cuts threads 4 to 40 per inch. Countershaft and Motor Drive Types. ‘Wt. 280 Ibs. Operatesfrom i light socket. ‘75 as:shoun Write for Free Descriptive Circular No. $- SOUTH BEND LATHE WORKS 518 E. Madison St. Seuth Bend, Ind. Mee

WE Do Gua cant Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers \

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Sa Anew, fast way to have plenty of money to pay your bills—meet the mortgage—live well—BE YOUR OWN BOSS. Make 500 to 600 Per Cent INCREASE. on. raw materials—keep up to: 80c. out of each dollar you take in. Start right in your own home or. in a vacant store—any place where you have a-few. square. feet. My. NEW SIMPLIFIED METHOD:and:€OMPLETE OUTFIT starts you.” in.a.permanent, profitable business manufacturing fours tasty foods—delicious crisp Potato: Chips, Cheese- Chips, .Do-Nuts- and :Salted Nuts. You begin-mak- ing: moneyrat.once. No-experience needed.. I place 50 years oF Successful! Experience, of LONG-EAKINS COMPANY Be a Wholesale Distributor COMPLETE EASY TERMS Here’s another way to take your town by storm—set this BIG, AT- up: in a show window and: see the ple see the delicious. Potato: Chips will crowd around you in. droves ang Buy your factory fresh. Po- : . tato Chips: The il-. lustration: below of the: Chromium. Plated: Vat. Furnace and: Di- rect-to-Fat Slicer is- only a small part of TRACTIVE LOOKING OUTFIT crowds gather round: Let the peo-- or Do-Nuts tumbling out, andithey~ the complete: AHehind.you to assure your success, I Plan. the. Selling for You— You Supervise and Collect - the Profits ' Be a Wholesaler — make established: deal- ers your- salesmen, I have Brant New,- Sure Fire selling plans. All you do is tell the dealers about this plan— and the PROFITS START ROLLING IN. With my new plan you can also have every boy and girl in town selling Potato Chips for you: This plan is so: simple, you can. instantly see it will’ make you famous over night: Groceries, Deli- catessens; Restaurants,. Bakeries, Soda Fountains; Drug: Stores, Confectionery. Stores and. scores of other dealers do all the retail- READ. What [Indiana Operator Says F. A. PEOPLES . §00% INCREASE On Raw Materials ing for you. Dealers ev- erywhere waiting to be sup- plied. COMPLETE IN- STRUCTIONS. Formu- las: direct from my Test- ing Plant in Springheld— all furnished to you. PAY AS YOU EARN— Low Easy Terms I make terms to good, honest, industrious people who show me they want to make money quick, You don’t need a Jot of money to start — get it back the first few days you operate. A: bag of potatoes; some cooking fat, andia little salt, and youiare'ready togo: EVERY- THING: FURNISHED: to start for less than-a dòwn- payment on a cheap car. CASH COMES BACK QUICK. Withmy new improved: equipment. I furnish in my big KITCHEN". COOKED COMPLETE. OUTFIT Chromium Plated Furnace New Improved: Skimmer, @Raw Chip Baskets, Drain Pan tor 4 Mesh Skimmer, Glassine Bags, Dealer Circulars “For the past six years I have been knocking about on one thing to an- other—all the time on the lookout for a substantial and dependable busi- 5 ness, which could be established with small capital, In looking through a magazine, I came upon an advertisement of the Long-Eakins Company, lo- cated in Springfield, Ohio. I went over there and was perhaps over-cautious and in all, made three. trips .before deciding I was. on the right track.. I have had: this outfit in operation for just seven days and to say. I am Doth surprised and delighted ts putting 1t mild—selling all the Chips I can make.” Actual tests show $8.00 CASH SALES from 63c Raw Potatoes, made into Chips. My specially con- structed Cooking Vat gives Outfit greatly increased ca- pacity. Fries 16 ounces fine Quality, Finished Chips in FOUR MINUTES. Many food authori- ties are now recommending the sale of unpeeled Chips. because they retain the minerals found in, and under the skin of the Potato. With my new KITCHEN COOKED OUTFIT yow can specialize in Mineral (unpeeled) Chips — Be- sides Potato Chips, you can make extra profits with Do-Nuts, Salted Nuts and Cheese Chips. The LONG-EAKINS Company Manufacturers of Carmelcrisp and Crispette Equipment §42'South High St. echi Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers Springfield, Ohio slicer, included: with thisoutfit,afull*frying’’ ofrawpotatoes can very- quickly be- sifeed: into the vat at one time, Blicer isattachedto the frying vatso-that the peeled or unpeeled’ potatoes fall- directly. into theliot fat.--sayes trouble of soaking and- draining chips. Ky. 1 0) ) H. W.. EAKINS, President, Long-Eakins Company, ` 542. So. High St., Springfield, Ohio. I Dear Sir: J am. anxious to make money. Send me all the I facts without any obligation. Tell me how I can ' get in this amazing, new business, QUICK. NAME ne. ADDRESS.....sssssecssteeenee oes 27

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PORTABL Not a used or rebuilt machine. A brand new regulation Remington Portable. Simple to operate, Full set of keys with large and small let- ters. Carrying case in- cluded free. Use it 10 days without cost. Write today. Say: How can I get new portable typewriter on 10-day free trial offer for only 10c a day? Remington- Uii Rand Inc., Dept. 2803, Buffalo, N. Y. GET OUT! \ IVE CLOSED YOUR HOME WITH (PLASTIC WOOD / Makes 1001 Home Repairs—Easy! it’s surprising how many things you can fix with this marvelous new discovery—Plastic Wood. it repairs damaged wood, fills holes in wood, plaster, repairs broken furniture, replaces rotted wood, resets loose casters and drawer pulls, etc. It’s simple, too, because Plastic Wood can be shaped and molded as easily as putty but it quick- ly dries to hard, permanent wood—wood that holds nails or screws without splitting—can be sanded, planed or carved, can be painted, varnished or lac- quered—in fact, it can be handled and treated just like real wood. You can get this amazing Plastic Wood in 25c tubes and 35c cans at paint, hardware, department stores, AARNE EEE ae MME all FOOD PR n AIR, An exceptional business which\ be started on a small scale bullt up out of profits. De- cidedly unusual. You can work at home. Chips come tò you al- ready made. Simply drop into hot grease and they're ready to eat—big, tasty, crispy, delicious! No complicated work, Experi- ence unnecessary. Stores do your selling for you. You don’t invest @ cent until you've sold yourself on the possibilities. Then you can start with $8.50 investment. Money-back guarantee goes with initial purchase, Send NO HOUSE-TO- HOUSE NO COSTLY MACHINE TO BUY ior actual copies at orders rom tributors show. ow their business grows. Al usines for EXPERIENCE men and women alike. No super- salesmanship, no big investment, UNNECESSARY We furnish everything—display stands, advertising, etc.Get the excluslverights for your locality. Write at once. Samples end particulars free. FLUFF-O MFG. CO., Dept. 1515-E, St. Louis, Mo. HIGH BLOOD PRESSURE Quick Relief, or You Only Pay When Satisfied If you suffer from High Blood pressure, dlzzlness, ringing in the cars, can’t sleep at nights, feel weak and shaky, bad taste, nervous. if your heart pounds and you fear a paralytic stroke, to demonstrate Dr. Hayes’ prescription, we will send you postpaid, a regular $1 treatment on absolutely FREE TRIAL. While it is non-specific, many cases report remarkably quick rellef; often symptoms diminish and normal sleep returns wlthin 3 days. Contains no salts, physics, opiates or dope. Safe with any diet. PAY NOTHING UNLESS GREATLY IMPROVED. ‘Then send $1. If not your report cancels the charge. Write Dr. Hayes Assn., 8133 Coates, Kansas City, Mo. Print YourOwn Cards, stationery, advertising, labels, paper, circulars, tags, etc. Save money and time. Sold direct from factory only. Junior Press, $5.90, Job Press, $11, Power, $149. Do t popular raised printing. like en- 3 graving wlth any of our presses. re N Print for Others, Big Profits as Pays for itself in a short time. Easy rules sent. Write for free DA catalog of outfits and all details. ol STOLE The Kelsey Co. .K-9, Meriden, Conn. broadcasting, aviation and EN G I 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 No man or woman can escape the harmful effects of tobacco. Don’t try to banish un- aided the hold tobacco has upon you. Jain the thousands of invelerate tobacco users that have found it easy to quilt with the aid of the Keeley Treatment. wel x Treatment For Tobacco Habit Successful For Over 50 Years Quickly banishes all craving for tobacco. Write today for [ree Book telling how to quickly Free yourself from the tobacco habit and our Money Back Gunrantee. KEELEY INSTITUTE, Dept. D-762 Dwight, IMinols Home of the famous Keeley Treatment for Liquor and Drugs. Booklet sent on request. Correspondence strictly confidentlal. ige Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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AT would you Y give to put on pounds. of firm, attrac- tive flesh in a few short weeks ? Thousands have already done it—inex- | pensively — with this new discovery. Doctors for years have prescribed yeast to build up health, But now this jew discovery gives you far greater tonic results than ordinary yeast—builds health, and also puts on pounds of firm flesh—und in æ much shorter time. Skin clears to new good looks, constipation vanishes, you get new pep. I'D GIVE MY LAST CENT ` TO GAIN WEIGHT AND HAVE A REAL FIGURE. New discovery! Fills out skinny figures —so quick you’re amazed Astonishing gains in a few weeks with sensational new double _tonic. Richest imported brewers’ ale yeast, concentrated 7 times and combined with iron, Adds 5 to 15 lbs. — quick! then irenized with three special kinds of iron which - strengthen and enrich the blood, add abounding pep. Day after day, as you take Ironized Yeast, watch ugly angles fill out, hollow. chest develop, arms and legs round out pleasingly. Complexion becomes clear, indigestion disappears—new vitality comes. Results guaranteed No matter how skinny and weak you may be, this marvelous new Ironized Yeast should build you up in a few short weeks as it has thousands. If not delighted with the results of the very first package, your money back instantly. Only be sure you get genuine Ironized Yeast and not some imitation that cannot give the same results. Insist on the genuine, with “IY” stamped on each tablet. Concentrated 7 times This amazing new product, Ironized Yeast, is in pleasant tablet form. It is made from specially cultured brew- ers' ale yeast imported from Europe— the richest yeast ever 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 concentrate is 8 Lbs. in 3 Weeks Special FREE offer! To start you building up your health right “ ; In one week I gained 4 away, we make this absolutely FREE lbs., in 3 weeks 8 lbs. with Ironized Yeast. Tired feeling and constipation are gone, too.” Roy H. Tinney, Okla- homa City, Okla. 15 Lbs. in Month “I gained 15 lbs. in a month with Ironized Yeast.” Louise Adams, Friars Point, Miss. . offer. Purchase a package of Ironized . Yeast at once, cut out the seal on the box. and mail it to us with a clipping of this paragraph. We will send you a fascinating new book on health, ‘‘New Facts About Your Body”, by a well-known authority. Remember, results are guaranteed with the very first package—or money refunded. , At all: druggists. Ironized Yeast Co., Dept. 565, Atlanta, Ga. CT a a NT 8 Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 29

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wuer to FIND GOLD Dr it i A new prize book that tella prospectors, minera, and treasure 10 FIND GOLD hunters where to look for and how to find gold quickest, All the information ig authentic, complete and easily understood. All the gold bearing rocks and minerals explained. New rich gold and silver locations given where fortunes may be made. FR E $3 VALUE MINERAL RODS for Detecting Gold and Silver sent with book order if you will send us names of three friends who might buy this book of exclusive information, “How and Where to Find Gold.’* ‘There is no other book on gold like it, or that tells near as much. Learn how to be a prospector and find ‘ol day will bring you over $320.00 duily. Send for this book Gow. and get me EREE MINERAL ROD

S for locating buried treasure. Attrac- tively bi in black and gold. Price $2.50. Cash or sent C.O.D. EL Guawenhelmn Cons Pub. Dept. 11-B, 112 Sutter St. San Francisco, Calit. Model F-70 Complete with pros peller protection clutch, instant pivot

reverse, patented Co- Pilot, rubber mounted steering handle, posi« tive plunger pump, and other outstanding de- Make money In advertising. Prepare quickly during epare time Also earn while you learn, No eaperienca necessar: lew, enay method. Nothing elsa Wks it, ee ee iee booklet —**Win Success in Advertising’, and . on, aia Page-Davis School of Advertising velopments. Everything 3601 Michigan Avenue, Dept. 2055, Chicago, Illinois, U. S. A. ou want, including Johnson’sfamous “Blanced Construction,” METAL-WORKING all at one low price— nothing extra to buy! $ Don’tbewithoutthis mare a l A l H E instructive booklet, saranceo fA. It’s Balanced Con- | New designs and mass production Coit PAO ya Soor S TES oan | g methods make this amazing bar- king lati i j % gain possible. Completa metal working lathe wit! ipo illustrated SER HORSE compound slide-rest, improved three-jaw chucking gations ‘Both ree Writer S i. device, 6 in. swing, 24 In. overall length, 24 Ibs. J M ° Ss Send postcard for catalog and 10-day trlal offer, or lohnson Motor Co., 200 Pershing save time and send $1, balance plus express C.O.D. Road, Waukegan, Ili. Canadian John- i indi lathe 34.50. Extra bed lengths, 50c per ft. Attachmenta for milling, grinding. son Motor Co, Ltd., Peterboro, Canada ganding. saw-table. etc., available at low prices. JOHNSO N a pDoWwLls ` SEA-HORSES Health and Strength Course No JoKE To BE DEAF

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WORK METAL AT HOME with Tool-Room Accuracy ATLAS 9” LATHE, 79 Cash or 10 Months Easy Terms Here’s a lathe so strong and accurate that it is in professional use in hundreds of machine shops, gar- ages and factories, Yet so compact and inexpensive you can have it in your own home workshop. A few dollars a month will buy it and you will have a tool-running tested to 1/1000” accuracy to work with. Does all lathe jobs. A simple pulley change converts it to woodworking. 9" swing, 18’ between centers. Also larger sizes at prices similarly low. Modern Design Uses Only 14 h. p. Motor Belt. contained countershaft, no Plugs into light socket, costs outside shafting and pulleys. V- very little to run, Built-on mo- belt drive, 6 speeds. Cuis 4 to tor bracket: and switch. Try it 72 threads. Compound rest, auto- matie reversible feeds, hollow spindle. 45 parts of Zamak al- Joy, stronger than cast irom 10 days; money: refunded if not 100% satisfied: Write for free catalogue, also showing tools and attachments at very low prices. ATLAS PRESS Co. 2652 N. Pitcher St. Kalamazoo, Mich. $79 complete as shown less motor $89 with motor ready to run “WHAT MAKES ITLIGHT Make Big- Money Asking This Question MYSTERY CIGAR LIGHTERsgentire 5 Marvel Entirely new principle of ignition. It surprises, it amazes, itsells like wildfire. No Flint or Friction, All guaranteed. Sample with Sales Plan 25c. Sample Gold, Silver or Chromium Plated $1. Price per dozen $2.50: & $25 per E gross. Agents. write for a real money. making proposition. NEW METHOD MFG. CO., Desk M-5, Bradford, Pa. Want a Big-Pay Broadcasting Job? If you have. talent here’s your chance to get into Broadcasting. New. Floyd Gibbons method trains you for the job you. want, You learn at home in spare time. Iascinating course fully explained in Free Booklet, “How to Find Your Placo in Broad- casting.’’ Send for your copy today. Glve age. FLOYD GIBBONS SCHOOL OF BROADCASTING 2000 [4th St. N. W., Dept. 4£42, Washington, D. C. YOU Can Deo This EASILY You can’t imagine the joy you will get out of playing a P-A Sax’! It’s so simplified you'll master it easily and quickly, From the very start you'll attract that warm admiration you so much desire, and with your rapid progress will come a fine, easy job; big pay; social position; the primrose Life.Send today forfree booklet,beau- tifully illustrated, of P-A instruments, No obligation. Moderate price and easy terms. Send postal today sure. PAN-AMERICAN BAND INST. & CASE CO., 530 P-A Bidg., Elkhart,Ind.1082 Moderate Prick “Ål: Start $1260 to $2100 a Year PICK YOUR JOB MEN, BOYS—18 to 50 . Many Early Examinations Expected Railway Postal Clerks get $1,900 the first year, on regular, being paid on the first and fifteenth of each month. $79.17 each pay day. In normal years thelr pay is quickly increased, the waximum being $2,700 a year, $112.50 each pay’ day. Railway Postal Clerks, like all Government employees, have a yearly vacation of 15 working days (about 18 days). On long runs, they usually work 3 days and have 3 days off duty er in the same pro- Portion, During this off duty and vacation their pay continues just ag though they were working. They travel on a pass when on business and see the country. When they grow old. they are retired with a pension. City Mail Carriers, Post Office Clerks Clerks and Carriers now commence at $1,700 2 year and in normal years automatically increase $100 a year to $2,100 and $2,300. They also have 15 days’ paid vacation. Customs and Immigrant Inspector Start $2100 year. Men 21 to 45. Work connected with examining immigrants and merchandise enter- ing the country from foreign ports. You Can Get Them Experience is usually. unnecessary and political influence is not permitted. Let us show you how. Get Free List of Positions . Fill out the following coupon. Tear it off and mail it today—now, at once. This investment may result in your getting a life big-paid gov- ernment job. FRANKLIN INSTITUTE, Dept. B-294, Rochester, N. Y. Rush to me entirely free of charge (1) a full description of t'e position checked below; (2) Free Copy of 32-page book, “How to Get a U. S. Government Job’’; (3) A list of U. S. Government Jobs; (4) Tell me how to get a Government Job. O Railway Postal Clerk ..........+.seees sooees. (Start $1900 yerr) C Post Office Clerk ...... -- (Start 1700 year) Clty Mall Carrler ............ .. (Start 1700 yerr) Government Clerk—Flile Clerk. .. (Start (260 year) © Inspector of Customs.......... «(Start 2100 year) O Immigrant Inspector DUETS Start 2100 year) NaMO csseveree baarerseae tesesessaasonaeseeseesessssriresee aasan AMOTOSS 6 ie bated eee deed aw eee e ete e ee teenage te eee eae seanpaa Use This Coupon Before You Mislay It Thank You jor Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 33

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‘WILL theW ASHINGTON Cherry blossoms—and potential tragedy. Is the famous obelisk doomed by deterioration of inferior marble? Note the discolored base, showing area under observation. S THE Washington monument crum- ‘bling? Are its marble sides deteriorat- ing to such an extent that visitors are en- dangered by falling stone? Is America’s most famous memorial destined to come crashing down upon the nation’s capital city? These disturbing questions confronted federal officials not long ago. A large num- ber of visitors had been waiting to enter the memorial when a missile suddenly hurtled downward, striking with a crash near the base of the structure and narrow- ly missing two people standing in line. A chunk of marble as big as the average man’s fist had chipped away from a sec- tion-of the monument Jess than 150 feet from the ground! The narrowly averted tragedy galvan- ized government officials into action. Other fragments had fallen previously. The next missile might take its toll of human life. And always there was the whispered threat that perhaps the entire monument might come crashing down with untold disaster in its wake. A secret investigation was quickly launched to determine the causes of the memorial’s deterioration. An appropria-- tion of $100,000 was rushed through by the Public Works Administration. Since then federal engineers and stone special- ists from the Bureau-of Standards have 34 feet inside. Secretly probing threatened destruc- tion of America’s famous memorial, federal experts unearthed a host of startling facts. Here, for the first time, is the amazing, inside story! A striking close- up near the base, showing how joints are chip- ping away thru improper stress. worked tirelessly, carrying on intensive tests which have revealed a host of start- ling facts. At first investigators were not sure whether the chipping away of the marble was caused by inferior quality of the stone, by the natural weathering process or by improper distribution of weight. Survey of the site revealed that the round top hill on which the monument stands is exceptionally windy. Like the famous Flatiron building in New York City, the shape of the memorial acts with the air currents to produce severe whirl- winds. Experts wondered whether the terrific lashing of these winds against the shaft would be sufficient to account for the deterioration. Seeking an answer to their questions, scientists first considered the history and the makeup of the monument. The face of the shaft is of marble while the interior facing is of granite. It is 555 feet one- eighth inches high, 55 fect one and a half inches wide at the base outside and 25 The walls are 15 feet one- quarter inch thick at the base and 18 inches at the top. The taper of the shaft is one-fourth inch to one foot. The total weight of the monument is Modern Mechanix and

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ONUME by JAMES NEVIN MILLER 81,120 tons. There are 898 steps, 50 land- ings and 8 windows at the top. There is an electric elevator with a carrying capa- city of 30 persons. The memorial was constructed to a height of about 153 feet by the Washing- ton Monument Society, organized October 31, 1833. The cornerstone, a block of marble weighing 24,500 pounds, was quar- ried and presented to the Society by Thomas Symington of Baltimore, Md. It was laid July 4, 1848, under the auspices of the society. After the memorial had reached the height mentioned, work was stopped for lack of funds. No further construction was.accomplished for a period of 24 years when its completion was assumed by the Government. Between 1876 and 1888 ap- propriations were made for the purpose. The monument was opened to the public October 9, 1888. ° The investigators were not as interested in the monument’s history, however, as in its construction. They knew that good marble is durable, often lasting 200 years or more. What, then, was the composition of the memorial’s stone? They found the answer in an ‘early report by the late (Continued on page 132) Forced into the rubble section, water and com- DETERIORATION oF pressed air escaped to ASE OF CeO the outer facing, proof TA X of hollows in the ma-_ S sonry of lower sections. Inventions for May Alarmed by the disturbing reports, federal scientists plunged into in- tensive experiments designed to re- distribute the monument’s weight. Above, D. W. Kessler is shown subjecting blocks similar. to ma- terial under study to a pressure test. Joints on the blocks were cut back one and one-eighth inches, withstanding pressure of 4650 Ibs. per square inch before cracking. + “ 555 g Matble not ideally suited for structural purposes, according to experts, composes, the lower part of shaft, now crumbling... 35

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32 Passenger Mystery Plane Built to Span the Atlantic View of recently completed Sikorsky S-42, country’s largest flying boat, which is soon to inaugurate a regular trans-Atlantic passenger and mail service. The gigantic ship can carry 32 passengers and 1,000 Ibs. mail. Circular Slide Rule Fits in Pocket | NEW eircular t slide rule but 2% inches in di- ameter is claimed to ħave an aceu- racy even better than that of the ordinary 10-inch rule. Scales are en- graved on nickel silver discs, mak- ing rule almost indestructible. There are nine scales. German silver circular slide tule is small enough to fit vest pocket, but more accurate than standard 10-inch straight rule. “Overland Jack” Lives in Wagon HOUGH “Overland Jack,” well known character in Texas, lost both his legs while a schoolboy, he has never admitted defeat. In his tiny camping wagon drawn by four faithful goats he has toured 19 states in the Union, and every county of Texas, making his own living and enjoying life. All sleeping and cooking equipment is stored in rear of wagon. On level roads, “Overland Jack’? sometimes uses but one goat. “Overland Jack” of Big Sandy, Texas, lives and works in this tiny farm wagon drawn by his goat. 36 . GIGANTIC Sikorsky S-42 fly- ų ing boat, the largest ever built in this country, has been completed amid the greatest of secrecy in Stratford, Connecti- cut. It is proposed to use this huge flying boat for the first regular passenger and airmail service across the Atlantic Ocean. The air liner can carry 32 pas- sengers and over 1,000 pounds of mail easily, having a cruising range of 2,500 miles with this loading. Four radial engines built into the upper wing give this craft an unusually high eruising speed. Three bladed adjustable pitch propellers of highest possible efficiency are used. Many new features were used to make this the safest air liner ever built. Explorer, Wife Use Tandem Bike air» John Carveth Wells and his wife, headed for Abyssinia, ‘start out from Londonon tan- dem bicycle. OHN CARVETH WELLS, son of the famous explorer, accompanied by his wife, left London recently on a tandem bike, headed for Abyssinia. They plan to travel through Europe in this fashion, and seareh fer the fabulous lost treasure of the Queen of Sheba on ar- rival at their destination. This treasure horde is reputed to be bur- ied somewhere in the deserts of Abyssinia. Wells, after studying many old documents, believes he has located the cache. Modern Mechanix and

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Seek Lost Gold (ity Under Los cAngeles Derrick structure at mouth of shaft engineers are sinking on hill overlooking downtown Los Angeles to reach lost city. HE lost city of the “lizard people,” be- lieved to be far beneath the streets of Los Angeles, has been located, G. Warren Shufelt, mining engineer, claims. _ Using a treasure finding device of his own design, Shufelt has explored a large area of downtown Los Angeles. “T knew I was-over a pattern of tun- nels,” he declared, “and mapped out their course, the positions of the larger rooms, and the location of the deposits of gold.” He has secured financial backing for his underground explorations, and is now directing a group of men who are sinking a shaft in the heart of Los Angeles, just above what is thought to be the “key room” of the city of catacombs. The shaft is already down to 250 feet. The group plan to go down to at least 1,000 feet before abandoning operations. Legend has it that about 5,000 years ago three of these underground cities were burrowed out by a tribe of Indians after a great tongue of fire had “come out of the southwest destroying all life in its Inventions for May View of downtown Los Angeles, beneath which mining engineer Shufelt believes is lost city of gold dug 5,000 years ago by “lizard people.” Special treasure finding instrument has located many tunnels of catacomb city. Map of catacomb city, as determined by Shufelt’s special treasure finder. path.” The labyrinths were dug to escape future fires. The legend, as told Shufelt by an edu- cated Hopi Indian, says the lost city was dug with powerful chemicals, without the need for removing either earth or rock. The city was laid out in the shape of a lizard, this reptile being regarded as the symbol ‘of Jong life. According to the legend, all records were kept on gold tablets four feet long and 14 inches wide. Shufelt believes he has located thirty-seven of these tablets. The apparatus used in locating the tun- nels consists essentially of a plummet at- tached to a copper wire, and held by the hand inside a cylindrical glass case. The plummet sways continually, its ac- tion depending upon the nature of the minerals or earth structure below. 37

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‘Freddie- Fleck, chief: cameraman, diagram the action for one of'the sensational'dog fights featured in “Hell’s Angels.” left, assistant Foe and. Harry Peary, Needless risk of life ‘is overcome by this catapult which launches pilot-less planes down..a . wooden. runway. to . {See photograph on opposite page.). . their: crashing point. 38 AIRPLANES , How filmdom’s aces brave death ‘to provide thrills for picturegoers. Thrilling air maneuvers, as shown in back- _ground, are first’ plotted on the blackboard. Met idling, prop turning over lazily; a pilot-less plane stands: on the airport runway awaiting passengers. Suddenly-the motor roars into life, the prop becomes a flashing circle of steel and the plane leaps down the field. A passenger has acciden- tally tripped the throttle and the ship is running wild! The staccato roar of a second plane fills the air. Another pilot guns his ship. to the full to head off the runaway. At mile-a- minute speed they hurtle toward: each other. A'resounding crash and the two air- planes are locked in a splintering death embrace. Again two pilots have gambled with eternity to supply a movie thrill— and miraculously escaped. Oddly enough, the foregoing stunt, a scene from “Central Airport,” although con- fined: entirely to the ground, was more hazardous than various breath-taking shots which are filmed in the air. One of the spectacular crashes which highlighted “The Lost Squadron,” for in- stance, was entirely devoid of personal danger, albeit thrilling in the extreme. The plot of the story called for the unnecessary death of a stunt flyer who was to-erash a plane in a village street immediately before the cameras. To accomplish: the. feat, a pilot-less plane was shot from a: gigantic catapult to its crashing point. The. only hitch in.the proceedings occurred when a Modern. Mechanix and

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for the MOVIES S/M JAMES ‘BOWLES Not a new type of machine gun, but a late model movie camera, especially devised for the shooting of aerial scenes. “Pm going to give Jack the slow plane. In crash sequences calling for closeups of the actors, Earl takes the red ship and follows Jack. planes are fe tales sring on pires; a pk once used = ]°]] fly the gray plane and force Earl out extensively to simulate collisions in eariy m production. from all angles. Let’s make it short and slight directional error crashed the plane snappy—like a series of real crashes i in the on a rooftop instead of in the street below. air.” ` In these days of improved sound and pic- ture technique, head-on crashes into the ground are seldom attempted. Conversa- tion and closeups obviously cannot be satis- factorily recorded under such flight con- ditions. Dummy planes drop from inclined runways to provide the crashes while the closeups are filmed in the quiet of the barn-like sound stages. Despite the removal of some of the more obvious dangers of movie stunt flying, how- ever, improved picture technique has placed an even greater premium upon hair- line precision in the air. In the old days some of the daring fight sequences in mid- air were enacted by miniature planes man- ipulated by wires; but today when you see several planes looping in formation and in- dulging in various aerobatics you may rest assured that dar- ing pilots actually went aloft and- performed the. thrilling maneuvers in person. The customary procedure prior to the filming of a dog fight sequence is to plot the action in a chalk-talk session reminiscent of the football field. “This,” explains the chief pilot, drawing scrawls' Launched from the catapult at left, this plane crashed spectacularly in “The on the blackboard, “will be Lost Squadron” without endangering life. The only miscarriage in plans > came through a slight directional error when the plane crashed on the roof the dog fight action. instead of in the street, before the cameras, as intended by the director. Inventions for-May 39

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Star Closeups Are Filmed Against Background of Synchronized Air Shots Although some of the cinema stars are licensed pilots, most closeups are filmed on the ground. Experienced men perform. the actual, hazardous maneuvers in the air. Ten minutes later Garland Lincoln, Jack Rand: and Earl Gordon—who furnished the thrills for “Air Circus”’—are riding each other’s tails around the sky a scant 500 feet above the ground. Each time Jack is set for a getaway, Earl (doubling for the villain) comes roaring close behind him in. an effort to crash into his tail assembly. ‚Then Lincoln dashes in, seemingly from ‘nowhere, now passing scant inches from Earl’s ship, now zooming up between the :two planes in split-second maneuvers. All ‘of this, mind you, is taking place on an ‘aerial stage directly in front of the cameras. The planes seldom change altitude more than 500: feet and confine themselves to an ‘invisible boundary of 1000 feet. A0 The impossibility of filming‘ sound pictures under actual flight conditions prompted invention. of the device shown above. Mounted behind`the stationary. plane, the camera is pointed: toward a- ground: glass screen onto which are pro- jected the synchronizing “shots” previously filmed aloft. Dog fights such as this in which Death rides the cockpit may occupy only thirty feet of film in the finished picture; yet they are among the most difficult scenes: filmed for the talkies. Not only must the flyers avoid collision while actually passing each other at right angles to the camera, but they must appear to meet head-on to pro- vide the thrills: called‘ for in the script. In addition, they must: remain high enough to keep ground’ scenes out of the picture, keep within distance range of the lenses and confine their flying to a circumscribed area in order that the cameras need not be “panned,” or moved: horizontally. Flyers Stunt Without Air Rehearsals And the entire job is done without a re- hearsal! Other than the memory of a hastily plotted blackboard talk, the movie flyer goes up on a moment’s notice to gamble his life on his hair-line judgment in the air. How, then, are these miraculous stunts per- formed—and how does the movie camera- man photograph them? i The secret of successful cinema flying lies in finding three or more pilots who are easily teamed, who fly automatically with a certain psychic sense of what the other fellow is going to do. : (Continued on page 142) Modern Mechanix and

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Flapping “Air Oar” Propels Sailboat in Wind or Calm New “air oar, > when held rigid, acts as sail. In calm weather mast can be rocked back and forth as in rowing, to move sailboate At right i is shown mechanism for rocking mast, steering boat, keeping sail in wind. Speed indicator drags in water. HE “air oar,” most revolutionary sail- -boat rig ever devised, has been intro- duced by a class of aeronautical students at Detroit. The sail is practically an aeroplane wing on end, pivoted to the boat so that it can be turned with the wind, or rocked back and forth just as in rowing. The fabric covering is loosely applied, so that it can take the shape providing the best aero- dynamic curve. Experiments made with a canoe in var- ' ious kinds of weather prove the seaworthi- ness of the new sail rig. The “oar” here serves as a means for propelling and steer- ing the boat in heavy or light winds. New Pen Counts Words Written O LONGER need authors count words to determine how much they have ‘written — a re- cently developed sackless fountain Plane’s Wings Pivoted at Center À “FOOL PROOF” monoplane using piv- oted wings at last combines low landing speed with super-maneuverability and high cruising speed. Wings are adjustable from the cockpit for different speeds. In first tests a top speed of 147 m.p.h. was combined with a landing speed of but 10 m.p.h. . Glance at transparent bar- rel of new fountain pen shows how many thou- sand words have been written, or are left. Over 7,000 words can be writ- ten with but one filling. pen now does the work. i On the trans- parent ink section of the barrel are graduations indi- cating in thou- sands the words written since the pen was filled, and the remaining writing capacity. - Seven thousand words can be written with one filling. Pen was calibrated by actual count of words. Wings of the new monoplane are pivoted at center of lift, and are controlled from the cockpit. The wings may be set to act as air brakes, giving a landing speed of 10 m.p.h. G. W. Cornelius, the designer, is shown below. Al ‘Inventions for May”

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Stabilizer Stops Auto From Crashing After a Blowout Piston. and cylinder device which attaches to steering gear and: frame of any car eliminates hazards of blowouts at high speed. Piston does not affect normal driving of the auto. Tides Used to Move Boston Bridge THEN the 1,200,000-lb. draw of the Fore ¥ River bridge near Boston had to be ‘meved 400 feet upstream to a new position, - engineers let the tide do most of the work. At low tide scows were placed beneath the heavy steel structure. Then, as the ocean tide rose high in the river, the draw was lifted clear of its supports. It then was floated to its new location and lowered into position as the river water level dropped again with ebb tide. Pewerful tugboats towed the milion pound structure to its new location and maneuvered it into position. A few bolts were inserted, and the bridge was ready fer use, none the worse for its voyage. N AUTOMOBILE stabilizer which, elim- inates entirely the hazard of tire blow- outs at high speeds is now being marketed by a Los Angeles manufacturer. The device eonsists of a special piston attached to the axle and moving freely in a fluid-filled cylinder. Under emergency conditions the piston holds the wheels rigid. In a recent test the right front tire of an automobile traveling at 60 m.p.h. was blown out with a shotgun and the car did not deviate from its course. Kittens Frolic About Catnip Block Just a two foot high wooden post covered with: soft carpet, but how cats do love it! The secret—it’s filled with catnip. ATS find great pleasure in rubbing their paws on a new ornamental post filled with catnip. The novel decoration is cov- ered with soft carpet for greater feline com- fort, and attractively finished to match the home furnishings. BARGES RAISE BRIDGE AT HIGH TIDE At low. water high scows were slipped under this 1,200,000 povnd drawbridge on the Fore River near Boston. As the tide came in, the bridge was lifted from its supports, and then towed to a new location. Sketches at right show method. 42 Modern Mechanix and.

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Movie Expedition Films Fierce Death Battles in Jungles Startled by- sudden glare of flashlight, this ferocious tiger glares balefully at the camera; Photo made by expedition fhning-“Devil- Figer” in-Siam; India, and Malaya jungles. HOUSANDS of feet. of movie film record- ing some of ‘the most ferocious of jungle animals engaged-in battles to the death were brought back-. recently: The expedition spenta-year.in the tangled jungles of India, Siam, Indo-China, and Malaya. These jungle warfare.scenes will be used in the néw animal-adventure picture “Devil-Tiger.” Shots such as these show clearly how “survival of the fittest” ap- plies to: jungle beasts and reptiles. Enraged hyena snarls defiance as ponderous:Malayan-bear pre- pares to attack in matted’ un- derbrush of Asiatic jungle. Camera catches death. battle. be- tween leopard’ and huge python. Leopard clutches reptile’s head ‘between fangs for killing stroke. Inventions for May 43

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fearn to “Play BASEBALL Baseball is not just throwing and hitting a ball. Here stars tell you how a turn of the wrist or the grip on a bat put them into limelight on major league diamonds. by JOHN C. HOFFMAN. TARS like Babe Ruth, Carl Hubbell, Al Simmons, and Ted Lyons did not walk into the baseball limelight through luck alone. They learned baseball by studying the stars of bygone days. If you want to be a good batter or a good pitcher, let the men at the top of the baseball ladder teach you. Baseball might be called a sport in which mechanics is important. We might talk about leverage, fulcrum, power, air resistance, and speed, but without getting too technical, let us put the spotlight on the pitcher’s grip on a ball, the batter’s grip on his bat or his stance at the plate. Let's see what makes them go, so to speak. Let’s see how they hit, throw curved balls, knuckle balls, screw balls and whatnot. We'll take some of the better known pitchers first. Probably the five most popu- larly accepted deliveries are the curve ball, the knuckle ball, the fast ball, the Carl Hubbell, 1933 series hero, pitching for the Giants, slow and the screw ball. Some of the others are the fadeaway, the cross-fire, the fork ball and the downer. The possession of any or all of these CURVE ‘BALL TWO FINGERS ON:BALL’ bit mol ete] ` “CURVE” SHOWING TWIST oe eee BEFORE DELIVERY ~ Pitchers’ grips for some of the most popular forms of deliveries are illustrated here by Ted Lyons, White Sox ace. 44 Modern Mechanix and

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Babe Ruth, baseball’s great slugger, holds his bat long. deliveries, however, does not make a great pitcher. A winning pitcher must, of course, have a change of pace, a deceptive delivery, but most important, control. The curve ball is most common and comes in a hundred varieties. Most of them are thrown by placing the first two fingers on the smooth surface of the ball and thumb on the seam. This has a ten- dency to slighty retard the progress of one side of the ball while the side under the first two fingers is sliding, thus affect- ing a spin and the consequent curve. Throwing the Knuckle Ball The slow ball is generally gripped by all five fingers. At the instant of its deliv- ery all five fingers are opened simultane- ously so as not to put a spin on the ball. Approaching the batter, the ball thus ap- pears larger and has a tendency to throw the hitter off his stride. ` The knuckle ball is a widely used deliv- ery, but difficult to control. In the major- ity of cases the ball is held with the thumb and the little finger against the ball and the other three fingers crooked, with the first joints resting against the surface. Inventions for May intelligence, courage and last, Ty Cobb, master batter, was not an orthodex hitter. He held his bat short and kept his hands apart to be teady to bunt or place hit any pitch coming over plate. FRO B TER COMPLETING Swing Various stances at the plate used by great hitters are shown above. Hornsby’s and Groh’s are most unorthodox. A notable exception to the custom, how- ever, is Ted Lyons, Chicago White Sox ace, who places the tips of four finger- nails on the leather with the thumb pressed on the ball as in the case of the curve ball delivery. This would seem to make it more dif- cult than ever to control the ball, but not so with Lyons. Explaining his knuckle ball, he says: i “I find that I can get more of a break on the ball‘by gripping it with four finger- nails. It took years to develop this deliv- ery. I first experimented with the knuckle ball while still at Baylor University. I had _ (Continued on page 135) 45

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Tennis Racquets By first building up plywood and veneer forms like that shown above, a London factory is slicing out over 3,000 tennis racquets a week. Finished racquet is also shown. Jig Saw Operates With Foot À SIMPLE floor model jig saw which can be operated at working speed with only a foot pedal is now being marketed at a surprisingly low price. The saw is sold knocked down, in package form, to be as- sembled by the user. An electric motor, furnished separately, can be attached to the saw in a few min- utes. Though the design is simple, and only wood frame members used, there is practically no vibration of the saw blade, New floor model jig saw can be operated with foot pedal. 46 Sliced From Glued Sheets of Plywood LONDON, England, factory is using an entirely new production method to turn out over 3,000 tennis racquets a week, Huge sheets of plywood and veneer are curved to shape around solid forms and glued to- gether. A complete racquet frame is sliced out each time the queer plywood form is pushed across the saw table. Racquets made by this process are more accurately balanced, and all are exactly the same. Since they cannot warp, no press is needed. l Fine veneer woods are used on the outer layers of the frame and handle, to make the finished product even better in appearance than more expensive hand made racquets. Ship Models From Straw Hats Italian field cart and other models made from old straw hats. ARL ALAIMO of Atlantic City doesn’t throw away any of the old straw hats left at his cleaning establishment—he makes them into novel table decorations, includ- ing models of ships, planes, and Italian carts, Many Wall Plugs Fit in One Outlet OUBLE and triple outlet electric plugs are no longer needed.” A novel wall plug now available is of such a design that another plug can be inserted right on top of it. There is no limit to the number of extension cords that can be used on one outlet. New wall plugs fit on top of each other. Any number of cords can now run to one outlet, Modern Mechanix aad

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The ZMC-2, first all-metal dirigible, was built for U. S. Navy in 1929, Ab i Detroit, after four years’ duty at Lakehurst naval air station. FIREPROOF, all-metal dirigible even larger than the Los Angeles, and capable of carrying 30 passengers across the At- lantic. at 100 miles an hour... all this sounds like a dream. It is a dream now, but. within a few years this dream will be just as real as the all-metal airplane. -A dirigible with this speed would fear no storms such as wrecked the Akron, the Shenandoah, and the R-101. After building the first experimental metal dirigible for the United States Navy, the Metalclad Airship Corporation of De- troit has just completed plans for this giant aluminum liner, one of the most fool-proof, fireproof, and storm-proof machines ever invented by man. Army and navy officials have already promised cooperation and aid in building this huge ship, to be known as the MC-38. . A new aluminum alloy, “alclad,” in sheets but .0012 inches thick. will form the “skin” of the MC-38. This sheet metal is no heavier than a piece of heavy. paper. The length of the new ship will be 547 feet: The useful load will be over 36 tons. Eight gasoline or Diesel engines, deliver- Inventions for: May cAll- Metal “Dirigible Will Outrun Storms ove is view of ship today in hangar at The MC-38 as it will appear in flight when completed. HELIUM IN UPPER SECTION POSITION OF BALGONET AT HIGH SPEED AIR OUTLET VALVE AIR SCOOPS CLOSED AIR SCOOPS OPEN 7, = as ““—~ ain scoop Interior diaphragm gives rigidity to ship at high speeds. ing more than 5,000 horsepower, will drive the glittering aluminum air giant at a top speed of 100 miles an hour, and a cruising speed of 70 m.p.h. The range of operations will be around 5,400 miles. The metal skin: itself will serve as gas bag, with only fabric partitions dividing the interior vertically into sections. The aluminum alloy sheets of the metal- clad’s skin are “sewed” together by a machine fastening 5000 rivets an hour. At normal speeds a loose fabric dia- phragm is distended downward, the helium gas occupying the greater part of the hull. At higher speeds a row of “air-scoops” along the belly of the ship will be opened. Air scooped in forces the diaphragm up- ward, compressing the helium and making the whole ship rigid. 41.

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NIC RES te EA ey at cat FIRE BURNS FOR 170 D YEARS! A peat Log Lire near’ aee North Yorkshire, England has | never Leen put out. Louis Dombroski, Syracuse MY S 7 Blogs po Not Lap your HAND BECAUSE THEY LIKE YOU! 7hey are Licking the Salt formed WHE? YOU DASDITE, Hired Chor. Souhiriage Hass. Pog oo LOMO ie i ENV Mou can stop a 23 HP TRACTOR WITH YOUR MYL HANDS! Grasp the Le/t where If Crosses over pressing sides topether; Friction increases load so much that tractor stalls when clutch islet it. — Zyan M- Carothers, Hamilton, Mo, OG E 8 He A tae FY FRoG witt SUEFOCATE IF ITS MOUTH IS DROD-| PED OPEN! A fog must swallow air with its Mouth, Closed in order to Breathe. — VincentM, Merkel, Reading 2, These oddities of science, dealing with things we see or use almost every day, bring to our attention the fact that “all things are not what they seem.” Nic Sprank needs more good Oddities—and will pay ONE DOLLAR for each one sent in which he uses. Try your luck! Send in yours, but be sure it hasn’t been written up before in this or other publications. Include source of item, and proof if needed. Address Nic Sprank, Modern Mechanix, 529: So. 7th St., Minneapolis. 48 Modern Mechanix and

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“Electric Eyes” to Replace. Guards at Sing Sing Prison OX again science threatens to supplant the shortcomings of man with infallible apparatus. The electric eye, which never sleeps, is being installed in Sing Sing pris- on, to replace guards along the outer walls. Warden Lewis E. Lawes, after testing a number of photo-electric cell systems on | the prison premises, announces “There is no question about it. Installation of a complete electric eye system of alarms throughout the prison would be of tre- mendous advantage.” Cells will be installed to sownd an alarm the moment a person approaches within cight feet of the outer wall. A beam of light traversing the guarded area is fo- eused on the photo-electric cell. The in terruption of the beam causes sensitive relays to close and set off the alarm gongs. Dog Houses Now Made of Steel This attractive metal dog house can be assembled in few minutes. Sides are insulated to keep out cold and heat. TEEL dog houses that can be assembled in a few minutes are now being made by an Illinois firm. A roof section is re- movable. Wooden floor can be removed for cleaning. Sides are insulated. Electric Outboard Does 43 M.P.H. ACE TRIE outboard engines are at Jast available. Consisting simply of the standard outboard propeller housing and a compact electric moter, they use two auto storage batteries for power. Motor will drive rowboat at 4% m.p.hb. All electric outbeard motor drives cance or boat at 414 m.p.h. It runs for 5 ‘hours on two auto storage batteries. Inventions for May Light beams and the “electric eye” will replace guards along walls of Sing Sing prison. Dotted line shows path of bez ^ across gate. Inset: Dr. Zworykin, television inventor, c.-- amines new photo-electric cell which may be used ia prisen. Roof Pitch. Measured From Ground Pitch of any roof can be measured from ground with this bandy vest pocket device. Arms are adjusted until inside edges line up with roof surface. Angles are read directly. HE latest in carpenters’ tools is a tiny indicator which measures the pitch of any roof from the ground. The user stands facing the gable and adjusts the indicator until the roof lines up with the inside edges of the arms. The rise per foot is then read directly off the circular dial. Angles can be measured in degrees in much the same manner. With this tool, roof rafters are easily cut. The tool can also be used in the same manner as a protractor, for measuring angles directly. The arms are adjusted un- til they fit snugly against the angular sec- ‘tion being measured, and a reading taken. 49

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aring “Rocket Men to Invade Capable ofboth horizontal and vertical light, this rocket snaps a picture and re- turns to the sender. The Íate Herr Till- ing, German rocket builder, explains novel features of his wing rocket. Penetration of the stratosphere to a depth of fifteen miles is planned by the Cleveland Rocket Society, here shown conducting a successful test of a new rocket motor. The model motor consists only of a combustion chamber. A highly volatile gas combination is fed through two tubes in the nose. Oxygen is poured through one inlet and gasoline under 250 pounds pressure through the other. 50 Experimenting with giant rockets, dauntless scientists are planning fresh invasionsof the ether. Here is a complete story of their latest projects. Success of the rocket-driven auto, left, Paved the way for conquest of the ether. HE rocket-shooters are going to pitch in again this coming summer. Undaunted by reverses and tragedies during the past year’s experiments, the rocketeers are tack- ling their work with renewed vigor and ambition, plus improved apparatus and chemicals. Ernst Loebell, famous German engineer and rocket designer, promises to bring the rocket engines to their greatest point of achievement next summer. He is now in this country and is an active worker in the Cleveland Rocket Society. Loebell has been carrying on his pre- liminary experiments on the big Hanna estate in a suburb of Cleveland. In their cperations the Cleveland group has been making use of the lessons taught by the ex- periments of Loebell’s countryman, the late Reinhold Tilling, a noted radio engineer and rocket builder. Prior to his death, Tilling had been ex- perimenting with rockets and rocket planes for months. The success of a rocket which reached a height of 6,000 feet in 1931 spurred him on to the construction of a rocket with glider wings which unfolded- when the fuel was exhausted and brought the projectile gently to earth. This feat was hailed as one of the first practical steps to- ward the development of mail and passen- ger carrving rockets. The Tilling rockets were set in motion by telignition from a distance of 100 yards. They attained a speed of 700 miles an hour and landed five miles from the starting point, in accordance with calculations. Herr Tilling was working on a system de- signed to manipulate his rockets by radio control when he and a female assistant were killed in the explosion of a rocket which they were charging. Such information as emanated from the secrecy surrounding Tilling’s operations at Osnarbrueck, Germany, has since been in the possession of the Cleveland Rocket Modern Mechanix and

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the STRATOSPHERE > ei cas _ ATTAINED ` BY FREE. BALLOON SAA An artist’s conception of the man-carrying rocket of the future. Note autogyro vanes which float the rocket back to earth when power is spent, allowing it to settle gently on landing fins. Society’s guiding geniuses. They plan to ‘adopt the Tilling heritage and carry his work to further perfection. Ernst Loebell and his assistant, Ted Hanna, have also investigated another secret German rocket—that of the famous Fischer brothers, details of which have also been closely guarded. The Fischers have achieved the biggest advance thus far in the field of passenger rocket flying. The Fischers pursued their experiments on the island of Rugen in the Baltic Sea under the auspices of the German War Ministry. Otto Fischer, brother of Bruno, who designed the rocket, was shot up 32,- 000 feet, more than six miles, into the air in a 24-foot steel projectile. At the peak of the rocket’s trajectory, Otto released a parachute attached to the (Continued on page 118) Inventions for May by ALFRED ALBELLI FOLDED LANDING 51

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Police Hear Calls. on New Midget. Radios Built Into Belts New police radio set designed for traffic officers and patrol- men is built into Sam: Brown belt. Single headphone clamps on cap. Aerial is built into belt. Dry cells are used. “Heavy Water” Intoxicates Mouse | MOUSE named Oscar frisked about strangely in the scientific laboratories of the University of California, after being given a drink of the new “heavy water,” even losing all interest in a tempting bit of cheese. The fluid contains hydrogen ‘Fsotropes,” twice as heavy as ordinary hydrogen. Level Measures Slopes and Angles NEW pendulum type level, in addition to telling whether a certain surface is level, tells exactly how far from being level it is. The pitch of a roof ean be quickly read on the graduated dial. On the reverse side slopes in inches to the foot are read off directly. This level gives the angle of any slope or the pitch of any roof, as well as tell- ing whether surfaces are level. Pendulum on. jeweled bearings gives readings on face of graduated dial. ro amateurs of Los Angeles have de- signed a tiny radio set that can be built in as an integral part of any police officer’s Sam Brown belt. A single head- phone clips on the officer’s cap. With these radios traffic officers and patrolmen will hear every call broadcast by the police radio transmitter. Traffic in an entire city could be bleckaded with- in a few minutes after an alarm, in case of bank robberies. The new invention marks a great for- ward stride in the field of crime preven- tion. Police can now work as a unit, under the control of one officer at headquarters, rather than as scattered units difficult to contact in emergencies. “Mike” Set Answers Doorbell OUSEWIVES need no longer run down- stairs each time the doorbell rings. By pushing a button on a new combination speaker and receiver, she can hear the caller’s voice from any desired point in the house. A combination receiver and microphone unit is built into the outside door frame to pick up: the caller’s voice. Friends can be identified by their voices, while peddlers may be dismissed without even opening the door. The doorbell can be answered from any room having “mike” unit on table at left. Combination receiver and microphone is built into door frame, as shown at the right. Handwriting of Twins Can Be Same OR centuries: it was believed that no two persons had the same handwriting. Robert Saudek, London graphologist, examining the handwriting of identical twins, found that 5% of them wrote exact- ly the same hand. Others wrote enough alike to: deceive bank tellers completely, and to make handwriting experts hesitate. Modern Mechanix:-and

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“Robot “Gennis Player BEATS EXPERTS The tennis robot is put through its paces in met play practice, above. At right, a closeup of the machine, showing the dial regulating the number of balls served. The lever left of the dial controls placement strokes and operates a tilting device permitting a change to drive or lob shots. Mechan- ism will bat 60 balls across net without stopping, at rate of 60 per minute. ITTING their skill against the strokes of a mechanical tennis player in a recent exhibition, St. Louis racquet stars found themselves deluged by a barrage of decep- tive lobs and smashing serves which drove them to the base line and forced them to net several of their returns. The invention of Edward Serrano, win- ner of the St. Louis district doubles crown in 1932, the robot will do practically any- thing the human tennis player can do ex- cept return the ball. Mounted on a mov- able, two-wheeled frame, the iron body of the machine is crowned by a bucket-like head which contains sixty balls. A strik- ing bat, powered by a small electric motor, serves, lobs or drives the balls as they are fed automatically from the hopper into a dish-like receptacle. Various adjustments permit a wide lati- tude of strokes. Hitting toward the top of the striking surface results in a top-spin drive; hitting toward the bottom pro- duces an under-cut stroke. When the ro- bot is called upon to lob it is adjusted backward until its “head” forms an acute angle with the ground, much like the war- time trench mortars. The serve is execut- ed merely by slowing up the drive. The mechanism is adjusted to bat sixty balls across the net without stopping at a rate of about six to the minute, the ap- proximate time required for the forth- and-back flight of a ball stroked at aver- age speed. The robot delivers the same stroke in series, or alters its shots, placing them in various parts of the court, at the option of the operator. Inventions for May Inventor points out the delivery and striking mechanism. In addition to providing invaluable vol- leying practice, the machine has an attach-. ment within its frame which renovates old balls by a re-napping process. This ingenious device. whitens the balls and brushes out the fuzz, saving the expense of constantly buying new stock. 53

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Death Rides “Rumble Seat of Oil “Bomber Oil: well shooting with nitroglycerin, most dangerous explosive in world, brings in gush- ers ‘like that shown above. After underground explosion, column of dirty. water ‘shoots up through top of derrick—then oil, if shot is suecess. At right: Setting timing mechanism used to explode charge at bottom of well. A COUPE with trim: steel compartment A replacing the rumble seat comes to a careful. stop just a few feet from the tow- ering derrick. The driver, with prema- turely-aged. face, relaxes as he steps out, for 300 quarts of. that deadliest of explo- sives, nitroglycerin; is not a pleasant load for the rough oil field roads. Warren G. Bleeker, world’s foremost maker of time bombs for oil well shoot- ing, is a familiar figure about the oil fields of this country. His “shooting wagon,” with its cable reel in back and its load of “soup” has brought new life to many a sickly oil well. His‘ is perhaps the most dangerous oc- cupation in the world: There are no in- juries; the shooter is either alive—or dead. ` When a well is being shot, there are few onlookers. The yellowish, oily liquid: must be poured from the. 10-quart metal and rubber containers into long iron. cans. 54 300 quarts of nitroglycerin are no unusual load for the rumble seat of this: “shoot- ing wagon.” powerful bombs may be seen. Cable reel for There must be no gurgling, no splashing! ‘The charge resting at the bottom of the well must be set off with a dynamite bomb. A few years ago, in an eastern field, a bomb set for one hour stuck in the casing. The shooter worked frantically to free it. The superintendent told: him to let it blow up as the time grew short. He kept working, finally freed it, yanked it to the surface, and carried it away from the well. Two minutes later the bomb exploded ... his escape was a miracle. The explosion of 300 quarts of nitro- glycerin 4,000 feet underground can not even. be heard, but the results are. very evident, if the shot.is a success. With a loud “whoosh!” a column of dirty. water and: oil shoots up to the top of. the der- rick. A mist of oil sprays the ground. Men run to cap the gusher. On all faces „äre: smiles. The well has come in... Modern. Mechanix and

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Batteries of Robots Scoop Power From Sea With Shovels Artist’s impression of a battery of wave motors scooping power from sea to turn dynamos which feed power to shore station. ROBOT wave motor designed to use the tremendous unharnessed power of waves at sea for generating electric power at low cost has been invented by Chester E. Shuler of Los Angeles. Robot-like machines built in the sea on concrete foundations have huge metal shovel arms which are lifted upward by onrushing waves. The counter-balanced arms drive electric dynamos through speed- multiplying gears, so that a small movement of the arms spins the generators at high speed. Ratchets permit the shovels to drop down freely as the waves pass on, to be in readiness for following waves, When a battery of these machines are installed to be operated together, the shovel arms are all inter-connected and belted to huge flywheels either on shore or in a powerhouse built in the ocean. Each on- rushing wave lifting the shovels would give a new impulse to the flywheels. The dyna- mos could thus run at almost constant speed. Something new for children. It is called the aero-teeter, because it goes up and down and around, providing some- thing of a sensation of riding a long ocean swell near shore. Inventions for May COUNTER BALANCE SHORE POWER HOUSE HIGH TIDE enn . “LOW TIDE LEVEL: SCOOP RISES AND FALLS =: WITH WAVES: Working model of the Shuler wave motor. Shovel floating on water surface is lifted up by onrushing waves. Move- ment of arm is here transmitted to shore to turn generators. OCEAN BED Camera Nearly as Large as Man Compare size of man in re- fation to size of camera dis- played recently in Berlin. NE of the amazing displays at the recent camera exposition held in Berlin was that of a camera almost the size of a man. This camera was complete in every de- tail and was fully capable of taking pictures. Merry-go-Round, Teeter Combined N INTERESTING development of the old time teeter-totter is seen in the aero- teeter, that may be worked up and down in the usual way, or round and round as a merry-go-round. By combining these two motions, the result is a ride like the “ocean- wave.” i : 55

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‘Build VIOLINS Before Learning to “Pla Almost every young male inhabitant of Mittenwald, in the Bavarian ` Alps, is an accomplished musician. orchestra in rehearsal. Above picture shows a village Left is an aged Mittenwald violin expert. ITTENWALD, picturesque village in the Bavarian Alps, may be old fashioned ìn its beliefs, yet it points with pride to the fact that almost every male inhabitant of the place can play the violin, cello, mandolin, zither, guitar and viola, And before a young man learns to play the violin, which is the instrument about which knowledge of the others is cen- tered, he must first know how to make one. For Mittenwald is the home of the violin. Back in 1684, when America was still a land of wild Indians and brave pioneers, Matthias Klotz, a native of Mittenwald, went afar to learn the art of violin making from Italian and Tyrolese masters. He re- turned years later and founded an indus- try. now the principal activity of the vil- lage. ` 56 Here is the start of a Mittenwald musical education. Young men build their own instruments. When they have learned why and bow a violin produces music, they are ready to undertake task of mastering the art of playing it. Klotz fostered the doctrine that before a man can really play a violin and take from it the best of its beautiful music, he must first learn just why and how the instrument produces that music. As a consequence, Mittenwald has produced not only a group of skilled violin-makers, but also a com- munity of soul ‘stirring music masters. Youths of the village look forward: to the possibility of attaining musical prominence. While many who have mastered the: arts of violin making. and ‘playing go forth into the world to achieve fame and: fortune, many others stay on to teach new. genera- tions the arts which have so long distin- guished Mittenwald. Modern Mechanix and

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Midget Floating Pump Delivers 5,000 Gallons an Hour N INTERESTING German invention is a floating water pumping installation which rests on pontoons, and can be moved around to different points along the shores of lakes or streams. Only a hose or pipe line need be run from pump to shore. A 2% horsepower engine drives the tiny pump for nearly three hours on one gal- lon of gasoline. With its maximum pres- sure of 85 pounds per square inch it is possible to pump about 5,000 gallons of water an hour. Two men can easily carry the entire outfit. This portable pumping outht, operated by a g : 2% ip: gasoline en- . ine, floats on water. New Lamp Bulb Has No Filaments — $'0G0 Sitens ot water an hour can be deliv- ered with the 85 Ibs. per sq. in. pressure de- veloped. Two men can carry the entire pump, or tow it behind a boat. Pressure Sack Saves Divers’ Lives HEN deep sea divers must be pulled up rapidly, without time to accustom themselves to the change in pressure, they become very sick. A German inventor has devised a pressure sack for this emer- gency. Divers are placed inside it as soon as they are pulled up, and kept under a gradually diminishing pressure for several hours. Iron chains surround the sack. When there is not sufficient time to get a diver into the pressure sack, compressed air can be forced into his suit. Ropes are used to prevent suit from bursting. : Katherine Heinrich inspects new filamentless bulb, which reduces light bills 60%. Inner glass tube has mercury vapor. NE of the most radical of recent elec- trical developments is the filameniless lamp. Tests have proven that this new bulb would save almost 60% in power costs. The lamp consists of two cylindrical bulbs one within the other, with the space between the two evacuated. The inner tube, filled with mercury vapor, has two electrodes. The bulb is cold at all times since the glow discharge gives off no heat. New Rays Found in Stratosphere APES studying readings of instruments carried by Settle and Fordney on their 11% -mile stratosphere ascent last fall, scientists announce the discovery of 4 new cosmic ray, originating far outside the earth’s atmosphere. : This ascent also settled a long dispute as Above: Compressed air apparatus directly connected to suit : of diver pulled up hurriedly from ocean’s depths. Below: to nature of cosmic Tays. New pressure sack, inside which diver is placed a few hours. Inventions for May 57

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WASHER, wringer, and ironer combined in one unit takes up ho more space than ordinary washer. Only- one motor is necessary. MANICURING machine shaves fingernails, polishes them; and speeds up : milady’s manicure in many o : : ether ways. Flexible drive = o o eg : shaft is connected to small ko : : INITIALS electric motor in cabinet. which can be : ironed onto any 2 cloth material, PEELER 'ssembling hand f 7E and will withstand power lathe pares @ E laundering, are potatoes, apples, and other vege- F now available. tables uniformly, shaving off very thin layer. Potato is peeled quickly by turning handle. , PITCHER tiene ge os tainee for ice cubes cools. beverages quickly, holds five pints. 58 Modern Mechanix and

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Bicycle Gearshift Makes Hill Climbing Easy for Cyclists YCLISTS no longer have to jump off and’ push their wheels up the steeper hills; now that a bicycle gearshift is avail- able. The high gear is.used: for normal riding; ihe rider has but to shift to low gear, and ride up the steepest of grades in comfort. ‘The coaster brake funetions as usual with both gears. In. one type. the- gear: selection is con- trolled by a lever on: the. frame; in the other the- shifting.is done by a foot-con- trolled: lever on the: pedal crank. One-wheel Trailer Folds.Up on Car F E “a0 NRI i ; : oe PeR 5 i ; FASTEN CARRIE R New. auto trailer has single pivot. whee! which awto- |. matically. reverses ang turns .- with: car. Entire unit folds: against spare tire when not im use. Rack is hinged to rear bumper, as shown. THE latest in trailers, a one-wheel affair that folds up against the spare tire when not in use, is finding great popular- ity among English motorists. A single castor -wheel- automatically re- verses or turns with the car. The luggage raek trailer is hinged to rear bumper at two points. New Crystal Radio Is Powerful WHE latest in crystal sets, housed in a beau- tiful black bake- lite case, has even an ilumi- nated tuning dial. It is claimed that the quality and volume of reception far ex- ceeds that of any’ other crystal re- ceiver. No bat- teries are need- ed—only aerial, ground, and headphones. Latest in crystal radios, with bakelite case and illuminated dial, gives high quality reception with headphones and gets distance. Inventions for May On this bicycle gear shift lever is attached to frame near seat. High speed gears are for ordinary riding; low gears for hills and rough, sandy ground, Gears fit any bicycle. Eyes Magnify Objects 100 Times LVA MASON of Minot, Maine, has eyes which magnify everything within his range of vision one hundred times, making pores appear as deep holes in the skin. He wears demagnifying glasses when at work, since his range of acute vision is limited. Luncheon Trays for Motorists TRAY whieh fits inside any closed car permits meterists patronizing curb ser- vice stands to enjoy food and drink as if they were sitting at a table. The tray can be instantly levełed by turning a thumb screw. No crumbs need get on the up- holstery. This inside serving tray hooks over the window frame of any closed car, allowing motorists to dine in comfort inside car. 59

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Army Pilots Scorn Danger to Fly Mail At left — Lieut. Col. H. H. Arnold, feature writer for Modern Me- chanix and Inventions, was named head of the army air mail in the West. Above — Army mail ships tuning up NDAUNTED by the hazards of un- known routes and Jack of training and equipment for long flights, Army pilots courageously took over the air mail when the government cancelled all private con- tracts. i The Army tackled the job enthusiasti- cally, even though very few of its pilots had been trained for bad weather flying. Army airplanes did not have the elaborate equipment that practically guarantced the safety of pilots and planes of the private lines. Few of the Army men knew the perilous routes over the mountains. They lacked two-way radio to guide them through ice, fog and storms. Some observers looked upon the govern- ment’s move as a test of Army aviation. Flying the air mail under all conditions was the greatest peacetime training for Army pilots that could be devised. Within a week six pilots were killed in comparison with the record of the com- mercial companies of eight deaths in the whole of 1933. The record of deaths met with a storm of criticism. Captain Eddie Rickenbacker, who established a West-East transconti- nental transport record of 13 hours, four minutes, 20 seconds on the last private air mail flight, called these deaths “legal- ized murder.” Despite these accidents the mail did go through. The Post Office department swore in 200 officers and 324 enlisted men to fly the mail. In all 148 service ships were re- vamped for this peacetime emergency. The order cancelling private contracts 60 The West-East traus-continental transport record was smashed by Captain Eddie Rickenbacker (left above) in the [ast private air mail hop. His time was 13 hours. and turning the air mail over to the Army was the direct result of a congressional in- vestigation which brought out evidence of apparent collusion. among private airline officials in bidding for air mail contracts. President Roosevellt’s drastic move was a severe blow to the aviation industry. The wave of protest was led by Col. Charles A. Lindbergh, aviation’s ace hero, who in an open letter to the President declared cancellation of the contracts “will unnec- essarily and greatly damage all American aviation.” Intrepid Army fliers, however, bravely tackled the task. An organization was ‘set up. In the West Lieut. Col. H. H. Arnold, feature writer for MODERN MECHANIX AND INVENTIONS, .was named head. of the air mail operations with headquarters in Salt Lake City. Modern Mechanix. and

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Dutch “Lightning Boat” Has Paddle Belts on the Bottom Queer Dutch “Lightning Boat,” as pictured above by artist, would cross Atlantic Ocean in 212 days, according to inventor, Paddles are mounted on two endless belts which travel at high speed across flat-bottomed hull, . Chain drive connects each belt to turbines, At right is first model, as made by C. J. Stoete, of Zandvoort, Holland, inventor, MODEL of a queer new ocean liner having endless paddle belts which drive it-across the waves at speeds of over 60 miles an hour has aroused great inter- est.in Holland. The hull is flat, with end- Jess belts on which paddle blades are mounted running across the bottom at high speed. The queer paddle arrangement lifts as well as pushes the boat, thereby reducing water friction. The inventor, C. J. Stoete of Zandvoort, Holland, asserts his inven- tion will revolutionize ocean travel. Hammer Tool Flares Tubing IX different sizes of brass or copper tubing can be neatly flared with one stroke of a ham- mer, by using a die and punch as- sembly recently placed on the market. Each of the six holes in the tube holder are thread- ed to grip the tub- ing without in- jury. With the tubing eripped in the die, a special punch is slipped into the tube end, and given one sharp blow with a hammer to form a per- fect flare. Sizes range from 3/16” to 4”. New tool can form perfect flares on six sizes of copper or brass tubing, 3/16” to 2". Inventions for May’ ' ENDLESS- PADDLE aah Cabooses Make College Dormitories BANDONED railroad cabooses have been turned into college dormitories by a sroup of North Dakota University stu- dents. By cooperating on expenses and doing all work themselves they are able to live All meals are on $2 per week per man. served in one caboose. North Dakota University students live on $2 per week in these: abandoned -railroad. cabooses. Students make own meals and do all work to keep down living expenses. 61

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Study Clouds to FORECAST White, fleecy cumulus clouds, casting no shadows, with blue sky visible between the patches, mean fine weather, When seen near the horizon, as above, they are somewhat flattened. E HAVE all, at some time or other, taken a tura at predicting tomorrow’s weather, with varying successes. We have marveled at mariners, farmers, or woods- men who become quite expert at forecast- ing weather, and wondered how they did it. It is the simple weather signs for which these amateur prophets look, signs which can be interpreted by anyone. Only these obvious indications will therefore be dis- cussed here. ; This article, of course, cannot make you an infallible weather prophet — nothing can be so fickle as the weather. With all the latest scientific equipment at its dis- posal, the Weather Bureau is only 85 per cent correct, and it figures it is doing right well at that. Four Types of Clouds Clouds are the most obvious weather signs and are easily read when one learns their language. There are four major clas- sifications of clouds cirrus, cumulus, stratus and nimbus—with 27 combinations of these types. Cirrus -clouds are feather- like, cumulus clouds resemble a wad of cotton, stratus clouds come in layers, and nimbus clouds are of no special shape but merely those from which rain or snow is actually falling, although sometimes the precipitation evaporates before it reaches the ground. Keeping these descriptions in mind, and referring to the photos shown here, it should be simple to identify the various types. Everyone has noticed droplets condense on the outside of a pitcher of ice water. 62 Predicting weather is not at all hard if one watches Mother Nature’s weather signals, The clouds, the sun, the air, the wind, even the moon and stats have stoties to tell if one watches them carefully, In circle: “Mares’ Tails” cirrus cloud photograph taken 36 hours before storm came. These are high and feathery. Below: Rainbows are of value only in predicting weather for the same day. If in afternoon, they mean fair weather. The same thing occurs when a cloud is formed—the moisture in the air is con- densed when the air becomes cool enough, and these tiny drops become visible as clouds. Since clouds are evidence of mois- ture in the air, a cloudless sky is a sure sign of fair weather. Small scattered cumulus clouds also de- note fair weather. These clouds are white and fleecy, and when seen near the hori- zon they are plainly somewhat flattened. Sometimes they appear as large patches Modern Mechanix and

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: E by DR. W. J. HUMPHREYS NSD U. S. Weather Bureau Washington, D: C. “Mackerel Sky” cirrus clouds, and similar: feathery for- mations, forecast a storm which may be several days away. They indicate high winds, probably accompanied by rain. of stratocumulus, but if they are soft and woolly, easting no shadows, and: with the blue sky visible between the patches, they still mean fair weather. High. feathery clouds are usually the forerunner of a storm, although the storm may. be several. days away. These cirrus clouds often take the form of “mackerel scales.and mares’ tails,” and indicate high winds, which will. probably be., accom- Inventions. for May: Large cumulus clouds indicate showers. When anvil-shaped mass shown above appears above the towering cumulo- nimbus cloud formation, bail or thunderstorms are probable. panied by rain.. Often two layers of clouds may be seen moving in different direc- tions—a sure sign of a rapidly approach- ing storm. While small cumulus clouds mean fair weather, large clouds of the same type indicate rain, usually showers. Often bil- lowy white clouds may be seen on the horizon, the tops towering to enormous heights. These are caused by rising cur- rents of air—a condition necessary for thunder storms. When an anvil-shaped mass appears above these towering cumu- lus clouds conditions are ripe for a hail storm. , Clouds May Resemble Waves Occasionally cumulus clouds take the form of a wave breaking on the sea shore, forming a long line that seems to be rolled along. This is known as a line squall. It indicates the meeting of winds from op- posite directions, causing strong ascend- ing and: descending air currents, and will invariably be accompanied by violent showers, high winds, and a considerable drop in temperature. Dark, low, ragged clouds indicate bad weather, usually a long period of steady rain. This type is known as nimbus, and is usually without any definite shape. Of- ten such clouds will be present a long time before rain actually starts to fall, or the rain. may cease though. the shapeless gray mass of cloud persists for some time. (Continued on page 120) 63

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X-Rays of Criminals’ Skulls May Replace Fingerprints CIENTISTS have worked out a sure means of identification of people that may some day replace fingerprinting. Scotland Yard and the U. S. Secret Service have shown interest in the method. ` Already a number of instances are known where criminals have mutilated their fingertips. i According to Dr. Thomas A. Poole of Washington, the frontal sinuses of each individual, located just above the nose, are different. X-ray plate shows up these individual peculiarities. Wax Plane Wings for More Speed Dr. T.. A. Poole points to X-ray of frontal sinus, just above root of nose, which may be used for criminal identification. All-Wave Radio Has But One Tube ONE - TUBE all - wave ra- dio set is now available in kit form which re- quires no wiring diagrams. All terminals are color - coded, so Qne tube all-wave radio brings like colors are in foreign short wave programs ; -on headphones. Manufacturer connected. also supplies construction kit. Auto Device Changes Oil to Gas CONVERTER unit invented by Vincent McDornell, Chicago inventor, actually changes cheap fuel oil into a fixed gas that operates auto engines. In first tests car made 40 miles per gallon of oil. Fuel oil costs are only about one-third those for regular gasoline, Transport air liner wings being waxed. Floor wax is rubbed into wing surface by electrically driven brushes attached on long handle. Speed is increased 3 m.p.h. by this means. THE wings of our huge air liners are now being waxed regularly, after tests showed that the mere waxing of the wing surfaces boosted the speed as much as three miles an hour. It is believed that the wax smooths out the irregularities in the wing material, thereby reducing air friction. Invention Catches Slug Passers NEWLY invented subway turnstile shouts “Stop thief!” when an attempt is made to insert a lead slug. In addition the machine can be made to douse the malefactor with water. Professor. A. C. Seletsky, inventor, de- N ` f i . signed the machine for use on subway ew converter unit fitting on any auto permits use of is . . fuel oil instead of gasoline, with much greater mileage. turnstiles and vending machines. 64 Modern Mechanix and

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Gadgets Net Edison “Disciple $3,000,000 Trompeter, tight, leans against his new sanitary garbage pail as he supervises a shop workman. UT of such commonplace gadgets as floor oilers, egg slieers and garbage pails, David Dewey Trompeter, disciple and one-time associate of Thomas Alva Edison has made $3,000,000. As a boy of nine, hack in Westchester county, New York, Trompeter began the tinkering that was later to lead to fame. Bitten by the aviation bug—that was back in 1906—he made model airplanes which sold for $5 and $10. Selden, one of the original inventors of the automobile, was a neighbor. The boy haunted the Selden shop, soaking up mechanical principles which later led to the invention of such prosaic but salable gadgets as the floor oiler, a soap solution dispenser and a long- handled scrubbing brush. The devices caught the fancy of the buying public and Trompeter eagerly sought newer and more profitable fields to conquer. He entered contests, collected a bonus of $250 for a collapsible cigar case and went gunning for bigger inventive game. About two years before the outbreak of the World war, the German -government Inventions for May Building: a street “marking device in the Trompeter shop. Here is Trompeter’s latest gadget—a flashlight dental mirror which lights up the mouth, ena- bling the subject to get a perfect view of needed dentistry, reflected in the large magnifying mirror. offered $10,000 for a non-rubber pneu- matic tire. Trompeter took up the chal- Jenge, solved the problem and then refused the reward when he -learned of certain diplomatic strings to the offer, later dis- posing of the invention to an American concern. Between times he constructed his wire egg-slicer, dabbled in aeronauties and invented the forerunner of the modern shock-absorbing airplane landing gear. The grim necessities of war brought the Trompeter genius to Uncle Sam’s atten- tion. There were secret conferences. Trompeter went back to his shop to emerge presently with a new bomb carriage and a multiple shell whose sections exploded at timed intervals. Each of the sections was released by an explosion compelling the remainder of the unit to continue its flight along a straight linc—the same prin- ciple used today in experiments with rocket plane motors. Trompeter expected no pay for these devices, and received none except the thanks of a grateful gov- ernment. Since that time, Trompeter has turned. out automatic doughnut and cotton-pick-: ing machines, gadgets enabling the blind to “see” and the deaf to hear—everything from auto skid chains to halitosis indica- tors. The stock market and the depression wiped out most of Trompeter’s fortune. Undaunted, he hopes to make another. If only moderate rewards are forthcoming, he’ll still be satisfied, knowing that prod- ucts of his hand and brain are making life easier and simpler for the other fellow. 65.

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Approximately same angle as that shown at right should be used in working out solution, but arms may be extended as far as de- sired, and point P moved farther out. Given point may be placed anywhere in- side of angle. REQUIRED: A CIRCLE “(TWO ARE POSSIBLE PASSING THROUGH OF GIVEN ANGLE. OR those who like to spend an hour or so with compass and drawing triangles, this geometry problem will prove very in- teresting. Here it is: Draw a circle which shall pass through a given point inside a given acute angle, and be tangent to the sides of the angle. For the best methods sent in for solving this problem, MODERN MECHANIX AND INVEN- tions offers $25, as follows: First prize $10; second $5; and four third prizes of $2.50 each. Accuracy, promptness, and simplicity, rather than elaborate drawings will be considered in awarding prizes. To be eligible for any awards, contestants must give age, occupation, and education. This information will not, however, be con- sidered in the awarding of prizes. Your entry should be postmarked not later than April 25, 1934. Decision of the judges, who will be MopERN MECHANIX AND INVENTIONS editors, is final. In case of ties, duplicate prizes will be awarded. Employees of this magazine or their rela- tives are not.eligible to compete. You don’t have to buy a copy or be a subscriber to enter. Address M-M GEOMETRY CON- TEST, 529 So. 7th St., Minneapolis, Minn. 66 $25 in “PRIZES for IVEN POINT TANGENT TO SIDES lem Geometry ‘Prob THE SOLUTION CIRCLE PASSES THROUGH POINT R AND IS TANGENT TO SIDES OF ANGLE. One of the two possible solutions to this problem is shown above. Of course, entries must show the method used in obtaining solution. GIVEN? ANY'ACUTE ANGLE BA‘C, AND ANY POINT P INSIDE THE GIVEN ANGLE. Raft Driven by Outboard Motor ATER sports enthusiasts have found a new use for the outboard boat engine. Queer pontoon-like rafts are being driven over the inland lakes at surprisingly high speeds by outboard engines mounted at the rear. . , The entire raft lies but a few inches above water. From a distance the bathers appear to be skimming over the waves with no visible means of support. This queer speed raft skims over the water like a boat. Long pontoons on each side give buoyancy, and reduce friction. Modern Mechanix and

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‘Realistic Air BOMBING Taught Indoors AERIAL SUDE PRGJ (SOO SQUARE MILES O A : > i ROTATING MOTOR CONTROLLES : z -O OBN PIROTS RUDDER BAR TURNS Practical training in bombing from the air is now given indoors with a new device developed in England. An ingenious projection machine throws on the floor of the room an image of the ground as it would appear to 2 bomber flying at a certain altitude. By means of a rudder bar the pilot moves the projection machine which in turn moves the image to give the appearance of flight. The instructor points out an object, the pupil sights it, and when he “releases” the “bomb” the image stops. Inventions for May 67

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Petrified Display Dinners Made From Real Roast Turkey Petrified wax foods made by two Minnesota college men retain their freshness even in blazing sun. Inset shows plaster mold which. is first made from original cooked food. Wax is poured in mold, cooled; and painted natural colors. Red Hand Signal Directs Traffic RED hand controls the heavy traffic on Fifth avenue in New York City. Faced with the problem of speeding up . pedestrian traffic and cutting down casual- ties, experts have evolved a new scheme. New signal towers have signals for auto- asts and signals for pedestrians, the latter in the form: ef a red hand on all four faces of cach: tower. Under this plan, pedestrian traffic will be given twenty seconds to clear in alli direc- tions as the signals change. Then automo- tive traffic travels in a specified direction for a period ranging from thirty to fifty- eight seconds, A five second pause is permitted between the twen- ty. seconds allotted Pedestrians and the next automo- tive “go” signal. This picture shows New York City’s. latest traffic control: device. It is a combined ‘pedestrian and auto signal, with the red hand for pedestrians. Contrast this with the old type signal also shown in this picture. ETRIFIED foods are now a reality. Van Olkon and Arthur Cohler, two young Minneapolis college graduates, have developed a secret wax composition. which can be molded into realistic imitations of absolutely: any food. The new wax foods keep their fresh appearance even with the burning summer sun beating down on show windows. Wax foods are used by restaurants, by ice cream manufacturers, or by anyone who wants to display a perishable prod- uct. Green peppers filled with gleaming macaroni, and topped with rich yellow cheese, turkeys roasted and fairly drip- Ping with delicious gravies, and even chocolate candy are duplicated in wax with a naturalness that is unbelievable. In making a turkey model, the chef first bakes a real turkey in the ordinary, style, basting it with rich sauces. The fowl is coated with stearin and kerosene, and a plaster mold made. The mold is cut apart, the bird removed, and the rejoined mold filled with the wax compound. Rides Golf Course in Silent Car Tom Lesure, greens keeper at the Pasadena “municipal | golf links, is here shown patrolling the greens in his specially built three wheel car. It runs sixteen miles a day. BLE to travel across hazards, over fair- ways and through the rough, this odd three wheeled vehicle shown above is used by Tom Lesure, greens keeper at the Pasa- dena, Cal., Municipal Golf Course, in patrol- ling the welt known California links. The car is light enough for use on any part of the course without: tearing up the turf, and as it drives through a friction clutch and is well muffled, there is no noise to disturb players. The use of this car saves Mr. Lesure not only hours of time, but an average of 16 miles walking every day. Modern Mechanix and

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Science to Rob Earthquakes of GERROR What caused this apparently well constructed building to fail? Scientists hope to be able to prevent future catastrophes, such as this one at Compton, Calif., which resulted in the deaths of several occupants. Edward C. Robinson, seismologist, getting earthquake recording device ready to jot down next earth shock in West coast area. Here are seismograph records of disastrous Long Beach quake of March 10, 1933. Upper record taken in Los Angeles shows quake intensity much less. Lower sheet shows Long Beach record. Lower right photo shows United States Coast and Geodetic Survey engineers gathering data of shifting land masses to make quake predictions. LIMINATION of the tragic toll of hu- man life and wrecked property, claimed every time an earthquake of major proportions is felt, is now believed near. : f By means of measurements taken. at regular intervals, scientists determine where the horizontal and vertical stresses that cause earthquakes are accumulating. Contrary to common belief, earthquakes have been accurately predicted. Shortly before his death, T. Omari, outstanding Japanese seismologist, warned of a major quake which he predicted would wipe out a certain fishing community. The vil- lage was ordered evacuated. The quake arrived on schedule, but not one life was lost. ; Inventions for May Similar methods are now being em- ployed in California. Thirty-nine seismo- graphs have already been placed in vari- ous key locations in that state, principally in buildings. In this manner a careful check of the motion of buildings during quakes will be obtained. After a temblor, the records will be compared and effects of the earth motions upon certain types of structures studied with the idea of eliminating dangers. : 69:

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Lieutenant John Edwin Hogg, U.S.N.R., author of this article, has just completed a tour of duty with the fleet in Pacifieé waters and thé facts he learned are well told:: He backs up his “bigger Navy” plea with concrete reasoning. Aerial view of sub- matine mother ship, “Holland,” with ‘subs alongside. Of the 11 submarines shown in photo, only one, the “Bass,” the large ves- sel moored to the star- board ‘side of “Hol- land,” is semi-mod- erm. Others are obso- lete world war types. 70 (NoTE: The views and opinions expressed herein are those of .the author and should not be construed as reflecting the official views or opinions of the Navy Depart- ment.) S THESE lines are written the Ameri- à can navy is in the worst condition of decrepitude and impotence that has ever marked its history. Pacifist domination and sheer neglect has left us with a navy so skeletonized and anaemic as to threaten our national secur- ity. Among some none-too-friendly neigh- bor nations armed: to the teeth and in a world seething with social, political, and economic unrest, we find ourselves with a run-down battle fleet that is only 65 per cent of the estimated strength necessary for national defense. Moreover, this pre- cariously weakened “first line of national ‘defense” is only 85 per cent manned! The Roosevelt administration is striving desperately “to do something about it.” Recently congress fired a heartening broad- side by assuring appropriations for new ships that will bring the U. S. Navy up to full treaty strength. Into these vessels will go improvements in design, speed, gunfire and cruising range developed since the World War. In the air the navy will aug- ment both its offense and defense. A- third aircraft carrier, floating a new swarm of planes plus large caliber anti-aircraft Modern Mechanix. and

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UNCLE SAM’S NAVY? A naval officer frankly discloses just how badly American defense has suffered f ` through inadequate building program. ~~ oN weapons and new machine guns will fur- ther bolster the defense. - The close of the World War found the leading nations financially impoverished, sick of war, and plunged into a new com- petitive race of armament building. This country made an honest and sincere effort to influence the other nations to make drastic reductions in both military and naval armament. To that end we called the Washington Naval Conference of 1922. So enthusiastically did we. plunge into that conference that in the words of the late Admiral William A. Moffett, who went to his death in the wreck of the airship Akron, “Uncle Sam lost everything but his shirt tails when he signed the Washington Treaty.” As a gesture of our peaceful intentions toward Japan and other nations of the vice È The frontline of defense. The bat- tleships “Texas” and “Idaho” in majestic parade; We need more of : these, U. S. navy experts claim. Here’s Strength Allowed by Treaties : U. S. Brit. Emp. Japan Type of Ship Tonnage Tonnage Tonnage Capital ships ....- 525,000 525,000 315,000 Aircraft Carriers.. 135,000 135,000 81,000 Cruisers “A’”.... 180,000 146,800 108,400 (Limited to 7 8-in. guns) Cruisers “B” .... 143,500 192,200 100,450 (Limited to 6.1-in. guns) Destroyers ..... 150,000 150,000 105,500 Submarines ..... 52,700 52,700 52,700 Totals ........1,186,200 763,050 1,201,700 . Scores of costly destroyers rusting and rotting at San Diego Naval Base. Allowed to go to ruin, these boats could not be put into condi- tion without huge expenditures. Inventions for May . . 71

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Battleships Which May Some Day Hold the Fate of American Security Topside deck view aft from bow of U.S.S. “Pensacola,” new modern battle cruiser. Note modern tripod mast, with numerous anti-aircraft guns. Far East we gave up the fortification and equipment of naval bases west of Hawaii. Simultaneously we scrapped 842,000 tons of new- naval construction at an expense of $275,439,275 to the American taxpayers. Included in this were eleven of the finest and most modern men-of-war; seven pow- erful battleships and four battle cruisers. These ships were building at the time and the average stage of completion was 30 per cent. No other nation made such sacri- fices. 3 Out of the debacle we salvaged two battle cruisers that were 33 per cent complete and cobbled them over into a pair of freak air- əlane carriers as an alternative to no-car- riers at all. These ships are the Lexington and Saratoga, two weak baskets in which 72 Before and after modernization. The upper photo of the U.S.S. ‘“Pennsylvania”. ‘was taken ` in 1916. Below you see how the | same ship looks today after hav- -ing been brought up to date. The U.S.S. “Northampton.” The Roosevelt: adminis- tration is rushing construction of a number of these modèrn warships to bring the navy up to treaty strength. ~ we have carried most of the eggs of our naval aviation in recent years. They are makeshift contraptions with guns, smoke- stacks and superstructures squeezed out of the sides of their flying decks to menace the life of every aviator making a landing or take-off. Having junked nearly $276,000,000 worth of REAL fighting ships the United States, under the terms of the Washington Treaty, was allowed to spend $76,760,000 for the “modernization” of the fifteen old battle- boats we retained: Some of these ships were nearly out. of date when the treaty was signed in 1922-and, of course, we have built no battleships since. A great deal of:this battleship “moderni- (Continued on page 126) Modern Mechanix and

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Motion Pictures Feature of Latest Television Programs AILY television programs featuring full length motion picture productions and assorted short features, such as comedies, animated cartoons, travelogues and news- reels, are being enjoyed by television en- thusiasts in and near Los Angeles. The motion picture programs are prce- sented daily by W6XS and W6SAO, stations operated by the Don Lee broadcasting or- ganizations.. The television transmitters operate on an experimental license issued by the Federal Radio Commission. Thousands of radio enthusiasts are now showing great intcrest in television and the programs from W6XS and W6SAO are re- ceived daily on a great many stations with- in 55 or 60 miles of the transmitters. Many of these amateur television follow- ers are making substantial. contributions toward the improvement of receiving appa- ratus. At the present time the pictures are coarse and somewhat “foggy,” but constant developments point to practical use of tele- vision within a short time. Powered Ax Chops Farmer’s Wood The top picture shows a powered ax wood chopper at work on a pile of wood. The farmer simply places the cordwood on the frame and the auto- matic chopper does the rest. Below is a close- up view of the ax as it emerges from the cylin- der head of a discarded facm engine. The pis- ton, to which the ax is welded, works back and forth in the cylinder. POWERED ax wood -chopper has been built by a Maine farmer from a discarded gasoline engine. Taking the cylinder head off, he welded an ax to the piston and turned the engine into a first class wood chopper. The erst- while motor is turned over by a small gaso- line engine. Inventions for May Verna Hillie, film actress, learns about television movies from Harty R. Lubcke, engineer. The tube which Lubcke is holding plays an important part in television broadcasts. Italian Perfects Smallest Tractor HAT is believed to be the world’s smal- lest practical tractor has been perfected by Professor Ferraguti, of Rome. The tractor, working on the caterpillar principle, has a five horse power motor of only one cylinder. The tiny tractor is very useful on small- farms and in land where there are many trees. It can be pivoted on one wheel and can make a complete turn in five feet of space. ` This baby tractor, powered by a five-horse power motor and operated on the caterpillar principle, has been de- veloped in Italy, It is very useful on small farms and in thickly wooded places, for it needs but a 5 ft. road. to turn in. 73

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Energetic Charwoman Rides Motorcycle Seeking Business This unusual means of advertising her work was devised' by an: English: charwoman. She rides about in the: vehicle and 'people who want her services simply call out to her. Skyscrapers Cooled With Steam Hick pressure steam is actually. heing # used in two. of: the ultra-modern. build- ings of Rockefeller. Genter, New York City, to provide cool air. This is. a reversal of the usual work of scalding. steam. The steam cooling units are built to pro- vide an abundance of cold air whenever needed. They: will‘ deliver the equivalent of 1,360,000 pounds’ of artificial ice. The system operates on the theory that water cools when placed in a vacuum. The water. in: reality boils, thus giving up its excess heat in-vapor form: Steam, escaping from a: jet: at terrific speed, produces the necessary. vacuum: for removing heat from the cooling water. Two: views of novel: new refrigeration plant installed in Rockefeller Center, New York City. 74- TEE advertising charwoman has made her appearance upon the streets of London. Determined to build up her clientele, this energetic worker purchased a cheap second hand'motorcycle with a large delivery-type sidecar. She rides about the city, dressed in her scrubbing clothes. In the sidecar, well displayed, are her mops, brushes, brooms and ladder. On the sides of the car, she has a sign proclaiming her as “The Travelling Char” and inviting prospective customers to stop her. This woman reports that the novel means of advertising has brought her a splendid. increase in income. Lawn Sprinkler Covers Square CAP DEFLECTS SPRAY DOWNWARD HOLES SLANTING | UPWARD AT 45° £ Sprinkler nozzle throws square of water over 18-ft. arca. À NEW lawn sprinkling nozzle now on the market is so constructed that water is thrown. in-a:square of any size up to 18 feet across. Along sidewalks pedestrians do not get their shoes and clothes wet while pass- ing. The illustrations above show how this remarkable control is accomplished. A sav- ing of one-third is made in water consump- tion, it is claimed by the inventor. Steam, permitted to escape very rapidly from a jet, creates a vacuum which absorbs heat from water in tbe gigantic cooling system. Modern Mechanix and

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200,000 “Reindeer “Roam Alaskan “Ranch This is the way -Alaskan reindeer raisers "ride herd.” At right is AI Lomen, . Nome; Alaska, -setting- out on a tour of inspection behind a team of reindeer. Reindéer:-raising-has become a major Alaskan industry through the efforts of.the Lomen. Brothers, who in 1914 organized the corporation that bears their name. Their herds number 200,000 head, and‘ are tended by Laps and Eskimos who at certain. seasons. of the year drive them to corrals such as the one shown.above. It is located at Elephant Point on Kotzebue ‘Sound, where deer are killed and packed. Right: Reindeer forage for themselves, are hardy, easily raised. ‘A LASKAN reindeer raising has assumed -big . business -proportions through the efforts: of the Lomen family, who in 1914 went'to Alaska, purchased a small herd of . 1200- head, and now have a far flung enter- prise. employing special ships, special „Slaughter houses, and a herd of 200,000 bead and. over. - Nome, Alaska, is headquarters for this distinctly -new and distinctly Alaskan in- dustry. A new cattle raising romance like that. of the old west bids fair to grow out of the reindeer raising business, for instead ef: galloping cowboys, Eskimos who mush their way through dense forest and across frozen tundra behind dog teams are the heroes of.these new sagas. The Lomens started with 1200 head pur- chased from Laps, who for centuries have domesticated the reindeer until it has be- come.a-comparatively easy animal to raise. The reindeer, unlike the caribou, is as easy to herd as sheep, and the Lomens found the animal took-readily to. Alaskan rigors. The Inventions for May first season they shipped out 74 carcasses— and had a hard time selling them. They persevered, built their own corrals and slaughter houses, notably the one at Elephant Point on Kotzebue Sound, and now have an:investment of over $2,500,000 in an.industry which raises a product find- ing an increasingly popular market. j Eskimo herders are given charge of flocks. Their pay ranges from $1200 to . $1500 per year, and they are provisioned by the company. They: herd their reindeer throughout a season, returning them from their wanderings to the corral every fall. The scene is not unlike that of the round- ups which made the old west famous. The increase is carefully tallied and the business of cutting out the market animals begins. Only the steers; however, and a small per- centage of the old'does are killed. Meat is dressed and stored in natural caverns, where nature does the freezing until the company’s ships call for loading. 15

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Unusual Ability to Repair Radio Tubes Brings Big Income Richard H. Seaman is shown above in his California labora- tory, where he renews the life of expensive cadio tubes. Glasses Magnify Eighteen Times EW microscopic reading glasses, so powerful that they increase the size of ordinary newsprint eighteen times, have been invented by Dr. William Feinbloom of New York. These glasses are three times more powerful than anything of the kind previously known. De. William Feinbloom, of New York, is pictured wearing his new type glasses, which magnify objects eighteen times. 76 ICHARD H. SEAMAN of Alhambra, Cali- fornia, is really a specialist. As one of the few radio tube repairmen in America, he is kept very busy bringing back to use- fulness burned out transmiiting tubes. The tube problem is of prime financial impor- tance to any broadcast station, Seaman first opens the tubes to replace the burned out filament and clean up the electrodes. The opening and sealing pro- cesses are done with blow torches, great care being taken to heat the glass slowly. In many instances a terrific heat must be produced to soften_the hard quartz glass. The sealing-in operation is very delicate, since the slightest slip of the hand or a bit too much pressure would ruin the tube. Miniature Boat Racing Popular Boat racing is now a popular Sunday morning sport in France. Picture shows miniature boats on a pool in Paris. INIATURE boat-racing, long.a popular sport for youngsters and adults in many American cities, has spread to France. Races are now held quite frequently in the historic fountain pool of the Tuileries Gardens, in Paris. This sport has awakened much interest in the art of model boat making and many fine specimens of sailing and motored models, the latter usually propelled by electric energy, are frequently seen. Wrench Fits Many Sizes of Nuts NEW “fit-all” wrench, recently invented and made available for general use, is particularly appealing around the house. ‘This wrench, without adjust- ment of any kind, fits eight sizes of hexagon nuts or bolts and by ap- proximate fit can be utilizéd. to tighten or loosen both- hexagon and square. This wrench handles eight sizes of hexagon nuts or bolts with- out requiring any adjustment. Outstanding feature is its size. Modern Mechanix and

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Noted Golf Pro Enjoys Home Comforts in Auto Trailer All ready to go anywhere. Mr. and Mrs. Roland Mackenzie simply attach this little home on wheels to the rear of their coupe and start out. It is roomy and comfortable. OLAND MACKENZIE, former amateur golf star who recently turned pro and started-to tour the country for tournament play, has solved his housing problem. He: outfitted a trailer which has all the comforts of home and with Mrs. Mackenzie is really enjoying travelling. The appointments and equipment of the trailer are so complete that Mr. and Mrs. Mackenzie frequently entertain friends in their home on wheels. ‘Home-made Thresher Costs $50 poe with the problem of ħigh cost in harvesting. small grains, Martin Kyhn deċided to build a home made threshing machine. He made it from parts of: mowing machines,- binders, plows, wagons, corn threshers, tractors and household applian- ces. It took him five years to build, but only cost $50. It is powered with a tractor which he also built at home out of an old Ford model: T roadster. It operates fast enough to keep two bundle wagons busy. This complete threshing machine cost its owner-only $50. He made it out of parts from various kinds of machines. Inventions for May Everything is handy in this novel residence trailer. Mrs.. Mackenzie finds it no trouble at all to prepare meals. Electricity Heats Poultry Fountains HOTOGRAPHERS, chicken raisers and others who must keep water at a speci- fied temperature in all weather conditions are interested in a new electric automatic water warmer. It consists of an electrically heated copper plate. When submerged it is regulated by a thermostat. The heater’s copper shell has a tinned surface to prevent contamination. Tests have shown the appara- tus can supply ample heat to pre- vent a pan of wa- ter from freezing at a temperature of 15° below zero. There are a great many uses for this new automatic water heater. Here it is placed in a pan from which chickens drink. 77

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European Car Forecasts Trend in Streamlined Automobile This is the latest European contribution to automotive streamlining and forecasts the probable trend in American cars. Lower photo shows radical change in rear design. Sea Gull Lunches Daily at Office CRAFTY sea gull has found a new way of getting his daily meals—and it beats panhandling or those handouts and pilfered crusts from boats along the waterfront. ‘This gull makes the rounds of office build- ing windows around mealtime, until the welcome bag of lunch, set out by some friendly worker, is spotted. The bird has lost all fear of human beings. Around mealtime this wise sea gull surveys office windows from the flagpole perch, in search of the daily lunch bag. Other more timid gulls usually arrive when the bag is empty. 78 ORE radical departures from previous standards can be seen in the latest European automobiles. The extreme, yet graceful, streamline bodies of foreign cars shows the trend American automobiles may follow next year. Perhaps the most radical of all is the latest model exhibited by the manufac- turers of the Mistral, a popular French make. i This car follows very strict aerody- namic lines and is said to offer the very least air resistance when in motion. The front fenders are huge affairs iù which the headlights are embedded. The body design has a very sweeping effect and the top slopes to the rear, which is almost a complete departure from form- er European and American ideas. Despite the fact that so much attention has been paid to exterior design, it is point- ed out that this new model provides many new comforts within. There is also room for storage of spare tires, gasoline and tools. Engincers ‘explain that each cutve and sweep has been ¢arefully - planned to, ‘cut wind resistance down to the very minj- mum, making for ease in driving ‘and economy in operation. American automotivė engineers ate keeping a careful watch on the success of the new design, realizing that the recent trend of models will require the greatest efficiency and beauty from streamlining. Wing May Be New Air Flivver Here is the new flying wing ‘“flivver plane” as it was shown to Dept. of Commerce aeronautic officials in Washington. ITH the department of commerce con- sidering authorization for building of “flivver planes” to sell for approximately $700, much interest has been aroused in a new flying wing model. The new flying wing combines many well known safety factors with ease of handling and economy of operation. United States government officials are seri- ously considering licensing manufacture of the planes on a big production basis. Modérn. Mechanix and

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Human Targets in Boats Dodge Deadly Aerial Bombs SMOKE SCREEN OUTLETS -This armored speed boat, piloted by a volunteer crew of three, cruises about on the ocean as Royal Air Force bomb- 'ing-planes swoop overhead, dropping showers of deadly aerial bombs. Hits and misses are radioed to planes above. IANGLISH bombing planes now practice 4 aerial bombing on human targets. Dead- ly “éggs” are dropped from.a great height on tiny. speed boats maneuvered about by yvoluntéer crews. Aircraftsman Shaw—fa- mous ‘as Lawrence of Arabia—pilots one of the boats in this dangerous same of “hare and hounds.” The boats have watertight compartments packed with expanded rubber ten times lighter than cork, to make them unsinkable. New Mouse Trap Is All Metal N ALL metal mouse trap which kills in- stantly yet offers safety to the oper- ator. A special latch operated by thumbnail pres- sure, opens or closes the jaws. Metal construc- tion provides for effective deodor- .izing in boiling water. is baited and Trap through hole in upper jaw. sprung Inventions for May Bombing planes dive to 1,000 ft. to drop aerial bombs on small moving target boat. Many hits are registered. Zipper Gas Mask Made for Babies SPECIAL handbag for carrying babies furnishes protection in case of a war- lime gas attack. An oxygen tank begins to ‘function as soon as the zipper cover is closed, supplying air to the baby. Thie zipper carrying bag to protect baby during war-time gas attacks closes tightly, and has oxygen tank to supply air. 79

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“Bodyguards Gace “DEATH General and Mrs. Cornelius Vanderbilt go strolling down Fifth avenue on a joyous Sunday morning. Not far behind you will note a husky bodyguard. John D. Rockefeller, Je., (carrying valise), travels a good deal, but never without a physically competent and alert bodyguard. The bodyguard, as shown in this picture, constantly keeps an eye trained on all those nearby, 80 Here’s the boy who started the bodyguard industry om its way to ptosperity. “Scarface Al” Capone, formerly of Chi- cago, but now of Atlanta, enjoying a ball game. Beside him is his son, Al, Je. The ball player is Gabby Hartnett. Some of the men behind Capone are his personal bodyguards. Henry Ford shows Prince Nicholas, of Rumania, what makes it run. But in the background are the ever present bodyguards. The two in dark clothes watch the Prince, while the one on the right shadows Ford wherever he goes. p THE ordinary run of things, a man does not go about looking for trouble. But this is not the case with a new type of professional men. They are called bodyguards. Trouble is their business— and death not infrequently is their reward. A bodyguard—and there are thousands of them employed throughout the country to- day, since the growth of kidnaping and the advent of gang terrorism—must be ever on the alert to forestall tragedy. He must grap- ple with cranks, fend off kidnapers, shoot it out with a would-be assassin—even offer his own body as a target in order to protect the man or woman under his care. Perhaps you recall the attempt to assas- sinate President Roosevelt in Miami, Flori- da. You will also remember that within a few seconds after the shots were fired, the Modern. Mechanix and

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to End KIDNAP MENACE by HARRY BERNSTEIN Unique and dangerous profession springs into being as the rich seek protection against gangsters. Per- sonal guards must be capable of put- ting up battle or sipping tea in fash- ionable drawing rooms of social elite. aA Be OEE Great Britain takes necessary measures to protect its prime minister, J. Ramsay MacDonald. Leaving St. James Palace, Premier MacDonald is trailed by a corps of bodyguards. President found himself surrounded by a wall of human protection. Any more bul- lets would have had to drill! through some faithful guard before reaching the chief executive. A few years ago, the President of the United States and certain very high gov- ernmental officials were the only ones who enjoyed the company of bodyguards. But such is the pathway ef modern civilization that today almost every man of wealth or political importance feels unsafe unless his very tracks are dogged by a faithful and physically powerful servant. The personal bodyguard is a direct product of the era of gangland. Big shots of the underworld, like AI Capone, started the fad as a means of self protection against rivals. Then, when the gangsters turned to the lucrative pastime of kidnaping wealthy men and women and holding them for ransom, the employment of bodyguards (Continued on page 120) Inventions for May President Roosevelt is under constant watch by an entire squad of secret service operatives. But he also bas his personal bodyguard, shown at right. Children of wealthy persons are under heavy guard these days, due to the many kidnaping attempts that have been made in recent years. The baby son of Samuel Insull, Jr., is never permitted to leave the house unless his nurse is accompanied by a bodyguard, as shown in this picture. š g1

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Electric Timing Clock Controlled From Athletic Field This clock, invented for use on football fields, has won ap- proval of coaches throughout the country. It is handled by timekeeper and gives accurate check on time left to play. ‘Hot Air Used to Expel Grease HeT air guns now on the market will drive out frozen grease and sludge in transmissions or differentials of automo- biles or trucks. , The gun, attached to a compressed air line, heats the air as it passes through and ejects it at terrific speed. The apparatus also quickly thaws out a frozen radiator. Old grease and sludge come out easily, with the. help of hot air, in- jected through this gun. Frozen radiators are easily thawed out in ten or fifteen minutes. Ordinary compressed air passes through a series of heating chambers before gun expels it at tertific speed. 82 FOR years the matter of timing a football game has always been a source of con- troversy. Either one side or the other would claim that too much time was allot- ted the opposing team or claim that the periods of play were “stretched.” That there was usually a discrepancy in official timekeeping was demonstrated by the fact that the time, as kept on the field, was seldom in accord with the time shown on the official field score board. Now coaches and other gridiron officials are hopeful that such trouble is at an end, with perfection of a football clock recently exhibited to members of the -American Football Coaches’ Association. The clock is several feet in diameter and is designed to be placed at one end of the field. It is operated by electricity, with the control button in the hands of ‘the official timekeeper, right on the field. i You Can Ride Free on This R. R. This miniature railroad runs for the fun of it, so to speak. People who live in its district are permitted to ride free. panman the only railroad that permits its passengers to ride without paying fare is located between the towns of Grim- sargh and Whittingham in England. The railroad was constructed fifty years ago for use of the Whittingham Mental Hos- pital staff and is still used for that purpose. However, inhabitants of all nearby villages are permitted to use its`facilities free of charge. As a consequence, the little railroad does a thriving business. Clock Tells Time Over Telephone RECENTLY invented “speaking clock” is a huge success in Paris, telling time to over 11,000 people a day. The clock can speak to thirty people at once. The telephone subscriber merely dials “Odeon 84-00” to hear the robot voice call out the exact hour, minute, and second. A photo-electric cell and reels of sound film make up the robot’s voice. Modern Mechanix and

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U. S. Cavalry Adopts Air-Cooled Aviation Machine Gun NITED STATES cavalry officers are now testing out a modification of the latest tank machine gun, a weapon lighter than that used by the infantry, but having a greater rate of fire than the automatic rifle. The tank gun was developed from the light-weight machine guns used in aviation. A cavalry machine gun must be light enough to be carried on one horse, permit- ting the animal to travel fast without too much fatigue. It must be designed to be unpacked and made ready for use almost instantly, since cavalry units move ahead and are more likely to be surprised. The water-cooling jacket has been elimi- nated, since cavalry normally does not fire the gun over extended periods of time, and an air-cooling arrangement is used. Tiny Air Compressor for Aquarium Air compressor unit driven by tiny 110-volt electric motor forces fresh air and oxygen through glass tube projecting down into the aquarium. Very little current is used. RESH air for the finny inhabitants of your aquarium can now be obtained from any electric light socket, with a recently marketed air compressor driven by a tiny electric motor. The compressor unit may be installed out of sight, and rubber tubing used to con- nect it to the glass aerator tube dipping into the aquarium. About two hours of opera- tion per day is said to be sufficient to re- fresh the water of an average size aquarium. Inventions for May At top: New cavalry machine gun assembly, complete with repair kit and spate parts. Below: Light weight tripod mounting, and a machine gun mounted ready for action. Rangers Find Story Without Words UTE evidence of a forest tragedy, a story without words, was found by forest service rangers near Portland, Oregon. While checking up on the forest service telephone wires, rangers found a pair of deer horns entangled hundreds of times in the wire. The horns are deeply scarred, with broken tips giving indications of the terrific struggles of the terrified deer. This wire is extremely difficult to bend with the hands, but here it was hopelessly ensnarled about the horns and the limb of atree. Telephone service was not interrupt- ed, however, for the wire never broke. A forest tragedy—deer horns found by rangers near Portland, Oregon. Deeply scarred horns and twisted tree limb are entangled hundreds of times in a forest ser- vice telephone wire. Service was not inter- rupted, for the wire, dificult to bend with the hands, never broke. 83

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imely ‘GIPS for “(SUNING Tune up the motor, tighten loose frame bolts, clean off the winter’s mud, and the old bus is ready for spring driving. Squeaks and rattles in the docrs disappear when pieces of inner tube rubber are cemented over the old rubber door buffers. Upper right—Tightening body tolts in chassis. by F. H. MONSON QPERING is the time to tune up the old bus and get it ready for a summer of plea- sure, Winter is so hard on any automobile, that a spring overhauling is a necessity. There are a number of things that you can do about your car to provide more comfort, safety and freedom from break- down. Perhaps the first object of attention should be the motor: If the points in the distributor are pitted, remeve them and dress their faces on an oil stone until clean. If they cannot be cleaned properly itis wise to replace them with new ones. Distributor Point Clearance er clearance, as speerfied by the manufac. A,cfT,ohstnded opo, way mbbed into the nia after turer of your car. This clearance is usually . about 18/1000 of an inch, or about the thick- ing it are in good order. Remove the spark ness of the wire in an ordinary paper clip. plugs and clean them. Most cars require a . See that the distributor cap is clean and sPacing of 25/1000 inch of the spark plug free of cracks. Inspect the spark-plug Points. It is important, for good idle and wires, and if they.are cracked or oil-soaked, igh speed, that the plugs are set carefully replace them;. the best plug in the world 2nd uniform. will not fire properly unless the wires feed- If the generator commutator is dirty, 84. Modern Mechanix and

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When pedals become tooslip- pery, clean with gasoline and ap- ply a few coats of ordinary tubber cement. Spring shackle bolts determine to great extent riding quali- ties of car. They should be greased, and not too tight. ¢lean with sandpaper, using a light pres- sure, while the motor is running. Never use emery cloth for this operation. It is best to put the sandpaper on a stick to prevent clipping the fingers. Readjust the charging rate to about 10 to 12 amperes, which should be enough for warm weather driving. Most generators are adjustable in the third brush —the narrowest of the three—which is locked by a screw on the back plate of the generator, Moving this brush in the direc- tion of the rotation of the armature increas- es the charging rate. Inventions for May Clean running board, fasten down new mat with rubber cement, pile on sand to press mat firmly down at all points. After you have drained the anti-freeze from your radiator, flush the system with clean water, tighten the water-pump pack- ing nut just tight enough to prevent leak- age, and refill. If it is necessary to flush the radiator with a cleaner it may be done with a sal-soda solution. Never use a flushing compound if your car has an aluminum cylinder head. In this case the radiator must be removed and cleaned separately from the block. Check Electrical Connections After you have done all the above work it is wise to tighten all electrical connec- tions on the car—on the dash, instruments coil, lights, distributor, generator, starter and battery. Clean the top of the batlery with a solution of household soda and water —then flush off with water. This removes all acid and prevents corrosion. If you will now grease and lubricate your car carefully, from front to back, you are ready to tackle the job of squeak and rattle hunting. Tighten all body bolts. These bolts hold the body to the frame, and are located, four to six in number, on each side of the frame. The nuts are tightened from the bottom, against the frame. Almost any car over a year old will de- velop a cracking or squeaking noise in the (Continued on page 118) 85

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Amazing Miniature Machine Successfully Makes Paper Replica of its giant counterpart in a Michigan paper mill, this miniature paper-making machine turns out the finished product before the eyes of onlookers. Every step is complete from the beating vat to the final drying process. Direction Finder for Air Novices Abret navigation is simplified with the use of a new direction finder which enables a novice to fly a straight course’ toward any radio station on which he is tuned. “A dial pointer on the dash panel points to zero when he is flying straight, veering to right or left with a change of direction. When lost in clouds and flying away from the station, needle action reverses, showing left when flying right and vice versa. The leop antenna on the plane wing above picks up radio signals when the pilot tunes in the dial on - the dash panel, to verify . his course. The pointer on the upper dial then . rectifies directional error. Developed: by. the U. S. Bureau of Standards, the devico -is expected . to: popularize the proposed | $700 “family” airplane. 86 Feo” crude pulp to-the unwinding of the finished rolls, this miniature paper-mak- ing machine is complete in every amazing detail, A beater first cuts the pulp to shreds. The mass is then impregnated with 99 percent water and is passed over various screens and between rollers to shape the paper and climinate moisture. Sixteen feet long and two feet high, the machine turns out a four-inch roll of paper three feet long every minute. In compari- son MoDERN MECHANIX AND INVENTIONS uses enough paper in a year to cover a sidewalk 5000 miles in length. Flashlight Used as Field Phone Both voice transmission and reception are supplied by this flashlight-field telephone. A folding telegraph key, used for the sending of code signals, insures privacy. COMBINATION flashlight, telephone and telegraph device may be hooked in on telephone or fence wires to provide field communication. Operating on a two-cell flashlight battery, the device has receiver and transmitter in one. It has a folding telegraph key for code signals and a flashlight lamp for copying messages at night. Modern Mechanix and

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Big “Profits in Back Yard FROG ‘Raising A back yard is large enough to stat the thriving business of frog raising. How to build up a big income with a very small investment is told in the following article. The white meat, with a taste similar to a tender, juicy squab, is greatly in demand. by S. L. SCHUTT HEN Charlie, of the De Luxe Cafe, told me that he would have to discontinue serving frog leg dinners because his whole- saler couldn’t supply the frogs, I became vitally interested in an industry that has proven to be more profitable, entertaining, and healthful than any other I have ever known. No frog farmer need search for a market, his crop is virtually all sold before it is raised, I could sell one hundred times my present production in a single week, and am.expanding my ponds so, eventually, I expect to have 1000 acres utilized solely for giant bullfrog culture. I sell tadpoles at five to ten cents cach by the hundred. They are used to stock farms and for aquarium purposes. Frog Meat Is Delicious Bullfrogs, that cost me less than one cent per year to feed, wholesale at $3.00 per dozen in large quantities. Smaller frogs, of which only the legs are used, sell for as high as seventy cents per pound. Each frog gives a pound of delicious white meat that has a taste similar to a tender, juicy squab. The whole frog is used, the front quarter APeve = Goines being just as delicious as the legs. farm. Right — 3- Just one pair of breeders lay over 10,000 Pound bullfrog. (Continued on page 128) Small frog farm res quires three ponds. Vegetation on shore and in the water is similar to natural haunts of bullfrogs. Inventions for May 87

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Fortunes Await These Needed Inventions Editor’s Note: Questions of readers desiring advice on ‘how to secure pat- ents, or methods of procedure, or on ideas for inventions will be answered when such requests are accompanied by a stamped, self-addressed envelope. Never send. models as they can not be accepted. -Address all inquiries to Patent Editor, Modern Mechanix and Inventions, 529 South Seventh Street, Minneapolis, Minn. Small, compact, electrical carpet e are home would be a great seller. ie and time again the author of this Department reads either in the scientific press or in the Patent Office Gazette where ideas outlined here have been perfected and commercialized. This proves not only the great alertness of our American inventors and their ingenious solutions of problems but it is at the same time a great source of inspiration to know that this publication is a factor.in the development of our indus- trial life. Although the vacuum floor sweeper has become immensely popular with house- wives, we should not overlook the fact that the lowly carpet sweeper is still largely used and that many women would not be without it. Yet this simple little household tool has not been improved upon for many years. What is needed is a smaller, more compact article electrically driven at high speed and electrically propelled so that the housewife need only guide it about. It is merely a problem in correct design and yet the solution might be worth a tidy fortune. Take another everyday, ordinary article like the. homely bed spring. Where is the inventor who. will invent a bed spring in which the individual springs, once they be- come broken or weak, can be easily re- moved and replaced with new ones? A for- tune awaits just around the corner.. Solid rubber tires have been coming off baby carriage wheels and coasters for many 88 adly needed by housewives. The device should be simple, Inventions such as these should bring good returns. A low cost electrical shoe shiner for the years. The inventor who can solve that problem will probably reap a nice profit. The records of the United States Patent Office show hundreds of patents relating to ‘door hinges and hinges of other types. There is still to appear a door hinge where- in it would be possible to suspend a door on two ball bearings, one-in each hinge and in such a manner that the door would never stick, the hinges would never squeak and the door could swing with the slightest effort. This is just a simple problem of mechanics. Just a few years back, an inventor stuck a couple of nails into-a weiner, connected the nails to a 110-volt circuit and proceed- ed to cook the weiner from the inside OUT as the current broughi to a boil the electro- lytic juices formed by the brine. It was first done more or less as a joke but the inventor of the system woke up in the middle of the joke and made himself a lot of money. This self-same system might be used in the prep- aration of meats of other kinds by first soak- ing them in brine and designing a cooker in such a way that the current will pene- irate all parts of the roast. Perhaps one of the. most vexing problems of the motorist in the northern climates is that of sleet freezing on the windshield. Quite an old problem indeed and many so- called solutions have been made. However, (Continued on page 142) Modern Mechanix and

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HER is the simplest possible storage to your car or radio battery over night, and in most cases the. cells will be fully charged by morning. Take a quart Mason jar, cut a large hole in the zinc cover, and insert a fiber or wood insulating disc. Drill holes in the disc to take the electrodes, one being of thick aluminum and: the other of iron, copper, --or lead. Electrodes are 1”x6”, and mounted about one inch apart. battery charger. It can be connected BATTERY — >» LEAD OR IRON DOORBELL TRANSFORMER BAKING SODA SOLUTION Fill the jar with water to within two inches of the top, and add ordinary baking soda or borax until no more can be dis- solved. Pour a film of Nujol oil or crank case oil over the solution to prevent evap- oration. Attach terminal screws to the outer ends of each electrode, and connect as indicated in diagrams to transformer and battery. You Can Make a Ninety-volt B Battery Eliminator From Scrap Parts OUR chemical rectifier cells are used here to obtain full wave rectification of alternating current for a 90 volt radio plate supply. Make each jar exactly as specified for the battery charger above; smaller alum- Inventions for May inum plates may be used here, since the output current is smaller than in battery charging. Be sure that the cells are arranged as indicated. Connect a small lamp in series with the line when first testing, to limit the initial current surge. After a few minutes the cells will be formed, and the lamp resistance may be reduced or cut out en- tirely. Aluminum spoons or strips from alumi- num pans can be used for electrodes. These will gradually wear away, but can easily be replaced. A regular condenser and choke filter unit is needed here, just as with any other type of rectifier. 89

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Catch Coded Radio Messages With Paper Tape Recorder DRY CELL — l SPRING recorder as the dots and dashes click in on your short wave receiver, and the coded messages will be neatly printed on paper tape. Turn the crank a bit faster, and you can.record every click of the high speed machine transmitters, translating the mes- sages at your leisure. The action of the recorder is based on the fact that a small direct current will decompose potassium iodide, a salt obtain- able at any drug store. If a current is passed between two wires touching a paper moist- ened ‘with this salt; a brown line is drawn. A tank for the potassium iodide solution is made from a cocoa can. Three wood dowel rollers are mounted to guide the tape through the bath, pins being used for bear- ings. Solder the pin heads on the outside, and coat the inside of the can with paraffin. The reels-are made from tin, with wood spools for the core. 90 LOWLY. turn the crank of this code B ; HERE O „A DETAIL OF “GUIDE AND. STANDARD. POTASSIUM: IODIDE SOLUTION SUPPLY REEL——3>| ze BRASS OR TIN REED HEAVY METAL ? SOLDER HERE SUPPORT BRACKET TO PREVENT LEAKAG S% CCÒDE SIGNALS ON TAPE Reel supports can be of heavy gauge sheet metal. The metal standard at the center supports the recording unit and paper tape. guides, Two fine iron wires bent in the form of hooks aré mounted on a hard rub- ber or wood biock with machine screws. The two wires should not be over 1/32” apart where they touch the paper tape. Ticker tape is ideal for the recorder. Rolls of thin wrapping paper can be cut into narrow rolls with a sharp hack saw. A telephone receiver or even an old head phone will do for the necessary relay. Mount a spring armature over the receiver magnets, so that the contact points will close each time a code signal pulls down the armature. Connect the relay to the speaker terminals of the radio. Place a dry cell in series with recorder points and con- tacts, and the recorder is ready to use. Modern Mechanix and

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All Wave Radio Marvel Fits in (Clock Case WV antenna `’ FLASHLIGHT, BATTERIES GROUND B BATTERY Sg SQUARE Back view of chassis, showing compact arrangement. Type 30 tube is used, Only aerial and 3 battery léads run from set. Coils are wound on tube bases, and just fit under condenser. HERE'S a dandy one tube set that’ll bring in the distance on either short or long waves. It uses headphones, eliminating those noisy DX squeals so annoying to the family, and will fit in a clock case. All parts are on a 1/32” aluminum sheet bent to form both chassis and panel. Drill holes as indicated, and bend panel to shape. Mount wafer type sockets diagonally so that large “F” holes are toward the lower front eerners of set. The tuning control, a .0001 mfd. midget variable condenser (23 plates) is mounted in center. A 50,000 ohm variable resistance goes in front of tube socket. Antenna con- denser may either be bought or made. Tube is type 30. Mount midget fixed condensers, grid leak, and 15 ohm filament resistor under chassis. All connections in A+ B— circuit go to the chassis. Make all wiring short. Inventions for May ae COPRER This radio fits in almost any: small clock case. But two dials are used——upper for tuning, lower for regeneration control, ANTENNA j CONDENSER (vELLow > P H sennym o ye 2 50000 OHM N (o sJ VARIABLE E ? RESISTOR 15 OHM RES. A ‘TO ALUMINUM PANEL. AND GROUND At A- B+ B 45 OR (RED) 90 VOLT COIL DATA B BATTERY HcoiL e WT METERS 14 25 23 4i 40 85 125 120 200 200 360 350__ 550 G F2 PF Coils wound with No. 34 enameled copper wire. Wind L1 and L2 in same direction. Reverse P and F1 if receiver will not oscillate. Coils 6 and 7 are for broadcast band, 5 icz police and airplane, cthers for short wave amateurs. Two flashlight cells will last several weeks as A batteries. To operate this regenerative receiver, turn knob on tuning control until plates are closed. Slowly turn potentiometer until a “plop” is heard. Turn past this point, and go back: until set is about ready to “plop” again. Now turn tuning control until a station is heard.—Thomas A. Blanchard. 91

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New JDEAS for the “Radio Experimenter 172" WALL BOARD OR WOOD VENEER PANEL 7 i OUT HOLE FOR SPEAKER tay N DESIGN TO SUIT SELF RILLE CLOTH INEEONT ONT OF Hh - > is ideal for homes FIREPLACE SPEAKER faving Guubed fire places. Get a sheet of %"’ wallboard or plyboard that will just fit in fireplace opening. Cut a circular hole in: center, to a size a bit smaller than tim of cone speaker. Mount speaker on panel, and run wires out through small hole in bottom corner of board. Glue grille cloth over opening in panel to improve appearance. can be PHONES “*,,°5 up considerably by using diaphragm cut from old photographic film. Cut %4"' diameter disc from old diaphragm, and glue to exact center of cellu- loid, as shown at left. Wood CLEATS CRYSTAL detector can be “fixed for good” by adjusting cat whisker to the loudest point, and placing a few drops of Ambroid cement around è this point. When dry no. more tickling of the crystal will be x necessary. AFEW DROPS OF AMBROID oe WHISKER IN ae Sosinian IN FIXED HEAD PHONES CATWHISKER | TO (AERIAL IS BENT FI \I GHOSFHOR Bi BRONZEN I/ BRASS Si STINT sare G M mnnm; n AOA STAUNEN CRYSTAL SET designed by T. A. Blan- chard is buit on 3%” diameter novelty pencil. Solder the top lead of the coil to the metal cap, and simply glue bottom end to the pencil. Remove eraser, push wad of cotton into bottom of cap, and insert a mounted crystal. Bend cat whisker from a 92 will heat more SOLDERING IRON Yipidiy in this stand, and may be used without troublesome cord. Fasten a plug to handle end of iron, and connect to heating element leads. Connect remainder of cord to small outlet which can be fastened to workbench, To use, plug in outlet cord, and insert iron. The heat will rapidly rise to point of iron, where it is wanted, with iron in vertical position. n DRILL TWO HOLES | | OPPOSITE EACH CUT CORD AND f CONNECT TO THE E GSA RESPECTI IVE PRO N PLUG MEERE A WOOD EL INTO uy RADIO PENCIL 2 ASSEMBLY. Dow COl | e HOLE FORCIBLY, FASTEN PLUG Wu RAW) = TO = CURRENT a OUTLET FASTEN OUTLET?” TO CONVENIENT LOCATION ON WORK TABLE TIE FLASHLIGHT. CELL. TO SHANK OF SCREWDRIVER LARGE STEEL WASHERS CUT AND FILED DOWN TO BLUNT POINT. THIS 1S EFFECTIVE FOR WORK AT CLOSE RANGE, SORE Aha es gee BEND TO DESIRED ANGLE ||? RADIO DIAL AND SHARPEN ENDS BULB AND INTO BLADES ~~ SCREW-DRIVERS for those odd corners are simple and easily made. Any steel washer filed down will do for work at close range, giving ample leverage. TO GROUND [a = = BENN O FEET OF ENAMELED#30 COPPER WIRE x GLUE END TO PENCIL. mM MAN a E length of phosphor bronze wire, and hold in place with bolt going through wood part of pencil. Scrape the enamel off a narrow strip of the coil, so that slide makes contact. To use, connect aerial, ground, and headphones, move slider and adjust crystal until stations are heard. Ae Modern Mechanix and

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A “Pocketknife e7odel of a Coal Freighter Ree eet of the great ships carry- ing iron ore from Minnesota’s mines to smelters along Lake Erie, and returning with coal is this little model of the Great Lakes freighter “Midland Prince.” Soft pine or basswood is sawed and carved out for hull, deck houses, hatches, lifeboats, ventilators, and smokestack. When the hull is completely carved and sandpapered, make the captain’s quarters on the prow, and glue to the deck. Twelve hatches are cut out and glued on deck level No. 3. The smokestack is cut from dowel rod, and the masts from candy sticks. Propellers, rudder, and anchors are cut from thin aluminum or other sheet metal. Masts are rigged with strong black thread. First give the model a coat of flat white paint. Then paint bottom up to water line, ventilators, and upper part of smokestack a Chinese red. Hull above water line, hatches, posts, railing, and lower part of smokestack should be black, and the re- maining portions white. SCALE IN INCHES o 1 e 3 4 A Canadian admirer of the “Midland Prince,” Great Lakes coal and ore freighter, offers these scaled plans. This pocketknife model of the “Midland Prince” will look well on any mantel or desk. She can be mounted in a cardboard cradle like that shown in lower view. Great ships like this are to be seen everywhere on the Great Lakes, carrying coal from Pennsylvania mines to dis- tributing points in the mid-western states, and „bringing back to eastern smelters cargoes of Minnesota iron cre. 7 i $ Q---- Straight pins are used for propeller shaft, lifeboat sup- ports and railing supports on deck. ie 2 25 ABOVE iS ELNE PoE 27g" ABOVE MEASUREMENTS OF DECK LEVELS FROM ‘LINE ‘A-A’ € DECK STEM BECK LEVEL. DYAL ALALAY K 2 J í ‘32 "E 32 „J$ “ey Š An A A Dog A os Er 7 T. + E t E aE à i CROSS ~pmi UPRIGHTS SPACED 3" APART “4 I6 i 2 | oe vewriaToRS 13" Plan and profile views of “Midland Prince.” Hull is carved out of 13” x 1%" x1 9/16" soft pine or basswood. Deck levels can be cut with coping saw and smoothed down with file and sandpaper. Inventions for May Two lifeboats swing from davits. 2

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Robert Page Lincoln, the author, roams from by ROBERT PAGE LINCOLN

Canada to Florida seek- ing hew experiences as Hunting and Fishing Editor a hunter, fisherman and m camper. Here he is N MANY ways the little shelter tent, in testing in the North Woods. any one of many designs and patterns, cut and slant, is the most interesting of the canvas roofs open to the purchase cf the camping enthusiast. There are those who look upon these tiny tents as suitable for children only, forgetting that the go-light camper, who carries his “all” on his back in a pack-sack, the canoeist, the mountain. wanderer and over-night camper who does not wish to be burdened down with a more commodious affair, selects the shelter tent. The shelter tent cuts down space to a minimum, and, on the average, is a sleeping tent, no more no less. Among the shelter tent patterns the so- called army or pup tent is the most common and, on the whole, the least attractive. It is merely a modification of what is known aş the wedge or A-tent with a rear extension, added to make it a trifle more roomy than it otherwise would be. i . A a A all DA aax wy cot |

Sy | PEAK HELD BY f A Ùp ts eK TREE LIMB ~aj eoa f The Dan Beard pattern, above, in many ways is the ideal light tent. Fires can be built in front of it to throw heat into the in- terior of the tent on cold days. CANOE TENT ~<— REAR VIEW

The popular Canoe Tent has many advantages. LIN le It can be made any size desired following gen- s% “ fas eral‘ outlines shown above. Steps in construc- “ity yp tion are described. in the text. Shear poles are =e ve used on open ground and in storms to avoid wl 4 RA lightning under trees hitting occupants of tent. le s Modern Mechanix and

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This tent, designed by Robert Page Lincoln, is roomy and tain proof and can be made easily. Openings in the flap and ‘rear provide ventilation on sultry summer evenings. The pup-tent can be made more roomy by simply adding a one foot high wall can- vas all around its sides and back, thus rais- ing it up off of the ground. This will pro- vide considerable more space within. This wall canvas need be only waterproofed muslin or lightest canvas. If this wall can- vas is added the tent will need to be erected with a ridge pole and guyed out at the sides. The Cruiser’s separable tent, as shown in the illustration, is an example of a very simple and practical shelter tent that any- ene can make. It comes in two sections, each section making a half-tent with an open front. A sort of hood ‘of canvas caps the two sections when they are joined at the. peak, the same turning any rain that falls. This is sewed to one side of the peak of one section, laps over and is tied with cords to other cords attached to the second. section. Inventions for May The Lincoln model tent in actual use. Note that the peak is held up by shear poles. The tent is five feet high. All light tents can be simply lined out with cords. _ CRUISER Ul SEPARABLE “TENT TWO HALVES JOINED WITH RIGGE HOOD | “PEAK SUSPENDED | "BY Loops WEDGE oR” ` TENT. The Cruiser’s Separable and Wedge Tents are among the simplest of light tent designs described in the text. To reinforce the ridge or peak a rope of about the size and variety of a window sash cord is sewed. in, to which the ridge rings or canvas loops that connect to the ridge pole are sewed. The second half of this type of tent has its peak canvas buttoned to the ridge of the other half, the peak hood over- lapping the buttoned section thus protect- ing it from the rain. The wedge or A-tent is, of course, merely a typical ridge tent, sewed together at the. peak as most tents are. It is probably the most simple tent of all to make. This tent, too, has the rope sewed into the inside of its ridge to support the same, and give bear- ing to the canvas loops that are slipped over the ridge pole. -The Dan Beard pattern of tent is another `. (Continued on page 130) 95:

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The heavy reel and cod, right, will successfully land deep sea huskies. This deep lake and salt water rod has an alu- minum reel plus a spe- cial chuck joint ena- bling use of various length tips. Above, new minaow-type ture. Note swimming ac- tion in water, below. An all-aluminum tackle box, left. Note handy tray action, Above, indoor target, featur- |i m ing centrifugal bul- let trap device. ` Deer haie spinner, warranted weedless. Special tackle kit, left, may be used for both fly fishing and bait casting. AKING up the challenge of the “big ones” that got away last summer, tackle de- signers have concentrated upon even- ing the odds in-the 1934 battle with the finny tribes. The weight of deep sea rods has been lightened with sturdy aluminum reels. Tackle boxes have likewise been made lighter and more compact. Weedless, life-like lures have been de- signed to inveigle the wiliest bass from the depths of his shadowy pool. Nor have the rifle and pistol fans been forgotten. A new indoor target embodies a centrifugal bullet trap which will stop anything from the .22 pellets to the heavy .45 pistol slugs. Modern Mechanix and

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Train Your Hunting Dog for Field Work on Game Now ATIENCE, kindness, and time are the main essentials in training dogs for hunting game. Most handlers start training pointers, setters, spaniels and retrievers at six months. By the time the puppy is ten months old he is usually ready for the field. You can not break a dog of gunshyness by firing a gun over bis head or directly at him. The easiest way is to take a gun of small caliber and have someone fire it at some distance from the dog while you pat the animal’s head to quiet him. Gradually decrease the distance until the dog shows no sign of fright. Then follow the same procedure with a regular hunting gun. Finally let the dog loose. Retrieving, natural to all hunting dogs, All hunting dogs love the chase Here is a cham- |} pion orange and white pointer hurdling a fence at field trials. Training dogs for f the field usually |; starts at 6 months. Inventions for May is best begun in the yard with a check cord. The dog must learn to stop on command; drop down where he is on command; and “fetch” when told to do so. Hold a long cord passing through a ring on a stake in the ground and attached to a choke collar. Hold the dog near the stake, get some distance away and then attract his attention. After he moves a few paces toward you, call “stop” and check him with the cord. After a few days walk toward him, check- ing him if he moves. Then walk past him and eventually you will be able to check him without the cord. A dog will easily pick up field work if permitted to work with an older trained dog. Preliminary retrieving can be taughi in the yard; Get him to open his mouth and say “fetch” as you push an object into it. Be sure that he does not drop the object until you say “give.” Puppies learn best when accompanied by an older dog. Here 2 puppies are watching their moth- er bring in a pigeon. 97

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Handy Ideas for AUTO Owners FOLO HINGE TO CENT REJUVENATE M POSTON CELL ZINC CASE ON NEGATIVE POSITIVE POST ` Dead dry cells can be pepped up Pack grease in tube with wood paddle, slip refiller into with storage battery by holding as shown for 1 minute. barrel of gréase gun, and push grease down into gun with : round disk. Handle of disk is narrow to fit refiller slot. AND WHEEL GEAR ` 2 ; Mount worm type steering gear housing on roof of shop. To get a deep, powerful note from your auto, mount one Attach crank arm te worm shaft, and 3" pipe to large gear foot length of pipe in back of exhaust, leaving 3’’ gap. shaft. Fasten lifting chains to heavy eye bolts in pipe. Air is sucked into loud speaker through gap by exhaust gases. Hoist will easily lift even heaviest engines out of cars. 98- - Modern Mechanix and

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Save Money With These Home and Garden Handikinks Barrel Makes Engine Muffler HE noise of the small gas engines used in many places for pumping water is often disturbing. Bury an empty barrel in the ground near the engine and run the exhaust pipe into it. Make a moisture drain hole at bottom of tank, and gas escape outlet pipe at top.—s. H. Bailor. Flower Box Hides Garden Gate INES and flowers are planted along the Wa backyard fences of « a Ai aM G wi a i i OM yu many homes A | to hide the yard, but there is always an open spot at the gate. Mount a box near the bottom of the gate, fill with good dirt, and plant vines or flowers.—M, Lonn. Handy Tool for Repairing Shingle Roofs IIS handy tool is made by cutting off, heating, .and bending a section of an auto spring leaf. One end is ground to a chisel edge, and used for cutting off nails underneath shingles. Use chisel and drill to cut nail- pulling slot. Strike the turned up edge to pull nails. —L. Schneider. Lightning Rod Protects Trees T? PROTECT valuable trees from lightning, drive a 10 iron pipe into ground close to tree. Nail 144” stranded SECTION OF AUTO SPRING 2 copper cable along tree trunk, and run branch cables Sense to high branches as shown in drawing.—H. M. Anderson. & 7) SSISESN Eaves Troughs \SS68KSS HANNEL irons and metal tubing from old bed frames can be put to good use as rainspouts for / the garage or shed. Support the drains from the roof CT i with wire, keeping one end always a bit higher. Galushens sectional! Many different shapes may be used.—M., Y. Rice. Broken Glass Keeps Gophers From Trees ANY prized young trees wilt away and die soon after they are planted, because gophers take a notion to burrow among the roots. An amazingly efficient method for foiling the wily gopher is simple and inexpensive. When planting the trees, merely scatter broken glass in thickly with the dirt being packed around the roots. Mr. Gopher will now detour after a short investigation. Tree roots will not be injured by the glass.—E. R. Dutcher. Inventions for May

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Flow to RESTRING Your H YA [z À ijn Save up to $5 by restringing your tennis racquets at home. The process is very simple, requiring only a bit of muscle and a few easily obtained tools. by WILLIAM E. MAHER P $ CARRIAGE BOLTS 4" CLAMP BLOCK h ABOVE RACQUET MOUNTED DETAIL oF * ee STRUNG HEAD CLAMP © 1$ WooD ae DETAIL OF VISE ASSEMBLY Felt lined vise to hold racquet handle can be made as shown above from blocks of wood, a thumb screw, and a hinge. Head clamp is made from pieces of strap iron. quets by following these simple instruc- tions. The process ‘is not complicated, and is extremely fascinating. The whole job will take only about 1% hours, and will save the restringer up to five dollars. No experience or expensive equipment is needed. The tools required are: a vise, four ice-picks or restringers’ awls, a pair of pliers (if possible, a pair with parallel B acting jaws) and a round wooden dowel Eee ee eee about an inch and a half in diameter and in Fig. 4; if 16 or 20, begin at throat as in Fig. 5. Thread eight inches long, wrapped with friction all vertical strings in loosely before beginning to tighten. tape. Of course, the most important requisite is the gut-used in restringing the racquet. : It is made either of silk or sheeps gut. popular than ever with thousands and thou- Of the two, the former is the C sands of sports enthusiasts. easier to work with, and the most wear- . Amateur as well as professional tennis able. However, it does not possess quite players can easily restring their own rac- the liveliness of sheeps gut. The price of 100 Modern Mechanix and OW that short working hours are here for everybody, tennis is becoming more

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Own TENNIS RACQUET prot ORR MATI ANA Malet eR : pol ale: FAST stan, fn PULLED FING ae Fig. 6 shows threading scheme for racquet hav- ing open throat. In Fig. 7 all but outside vertical strings have been tightened. Awl : > 3S is moved from A to B, slack eo S é = 7 LAST VERTICAL in outside string is taken up. ; 9 z RNG . POSITION the silk will range between 70c and $3.00 and the gut, between $1.25 and $6.00. The. eel pis cheapest silk string is much to be pre- [Į SAN FEREN ferred to the cheaper gut strings. A list of firms selling tennis gut in small quantities will be sent free to those en- closing a stamped envelope, Address Mop- ERN MECHANIX AND INVENTIONS, 529 So. 7th St., Minneapolis, Minn. ' Thirty-six feet of string, preferably in the 15-gauge thickness, are required to string a racquet. Nineteen feet of this is used for the vertical strings, and the re- mainder for the cross or horizontal strings. Before restringing, any frame holes that are rough or jagged should be reamed out with an ice-pick. The equipment needed to hold the racquet must next be prepared. The vise (any small vise) should be fastened to a heavy plank about 12 inches wide and a little longer than the racquet. The plank f SPLICING ‘A SS must be fastened to a firm support. If the TAN ee a STING Se 4 reader intends to string a number of : Y | n racquets he should make a head-clamp. This will be mounted at the end of the plank to hold the head of the racquet in place. When the wing nuts are tighiened, the racquet will be held firmly, and any possible warping of the frame will be prevented. A wood clamp is casier to make, but because of its s nni i i Ti f h tical string from two ; Figs. 9 and 10 show beginning of cross strings. Tie knot at fourth ver r T i necessarily larg- center strings: For rapid weaving of cross strings, pull through half way at time String 5 i wrapped around wood dowel for firm grip when tightening. Broken strings are easily dee: (Cont. on p. 122) as shown in Fig. 12, Trimming cord may be used at top and bottom to improve appearance. Inventions for May ` ` 101 KNOT START OF TRIM ATTACHING BOTTOM TRIMMING CORD ATTACHING TOP (3) TRIMMING CORD

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Simple, Attractive Bookcase Made From Bricks Ore bricks can be used to make a surprisingly attractive bookcase for den or living room. When you select your bricks pick colors that will harmonize with the furnishings of the room. Take five boards of the desired length, and as wide as your bricks are long. Place one brick: on each end for the base, three bricks between shelves, and two on top. A coat of paint for the boards completes the . job. The same idea may be used for shelves in the basement, garage, or workshop. Bricks may be given coat of varnish if desired.— N. Christensen. Telephone Lock INCE telephone companies are charging according to the number of calls made, it is often desired to stop unauthor- ized local and long-distance calls. This can easily be done by snapping a small padlock into the first hole on the tele- phone dial.—_—W. V. Gray. Scrub Brush Is Handy for Cleaning Stove Pipes HE annual spring cleaning of the stove pipes is always a messy job, especially if the soot has to be pounded out. Take a discarded scrub brush and fasten to a four-foot handle with wood screws. The brush can be slipped in and out of the pipes easily, cleaning out all of the soot withaminimum of dust flying about. —0O. E. Olson. FIRE BLANK CARTRIDGE UP CHIMNEY TO SHAKE OUT SOOT & LT a Blank Cartridges Clean Chimney of Soot THE annual chimney cleaning ritual can be for- gotten. Just secure a revolver and about three blank cartridges, preferably of 32 calibre. Holding the revolver in your hand, reach into the opening at the bottom of the chimney.. Place a burlap bag around your arm to completely close the opening N and fire three shots up the chimney.—Clair L. Wade. a Install Weather Stripping Now for Next Winter À GOOD job of weather stripping can be done on any window with little labor or expense. Since this pro- tection from cold is needed only in winter, it can be put on the storm windows. Nail almost any kind of felt or rubber weather stripping on the top and sides of the window casement. Fasten the bottom strip on the bottom edge of the storm window, instead of the sil}, to permit rainwater to run off in summer.—R. J. Madison. Put Felt on Chair Legs O PREVENT chairs from scratching hardwood floors, glue scrap pieces of felt on the bottoms of the chair legs.— C. McFarlin. Modern Mechanix and

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Novel BACK YARD BIRD HOUSES These new bitd house designs will look well in any backyard garden, and will at the same time provide comfortable homes for many beautiful song birds.

Bird-house replica of above home, made in scale of 60 to 1, has removable roof for clean- ing. Change doors for various kinds of birds. 2’ -0" SOLID WOOD

COVER SIDES OF CABIN WITH THIN WOOD OR METAL PROFILE LAYOUT

This silvery Boeing air liner model makes an ideal apart- ment home for mattins. Carve nose from wood; body from E tin or wood; partitions of 1⁄4” CUT WINGS 3 plywood. Use celluloid discs } FROM 2 IN. to stimulate propellers in mo- i} BOARD tion. Mount high on post, as 5 mattins prefer to be isolated. PLAN VIEW i v f N » x I0” STICK \ \ 4 k 34” x 15” y GLASS Ñ I 3

CROSS SECTION OF% N CABIN "= <= BIND HERE Attractive wren house is easily made from cocoanut. Bore 1’’ hole in side, loosen meat with screwdriver, and pull out with wire hook. Glue on straw roof, ‘and attach perch,

OPEN

5 ¢ MAKE VANE ABOUT 28 INCHES LONG A_WEATHERVANE TYPE BIRD FEEDER

This sheltered feeder will be popular both summer and win- ter with birds. Mount 8’ above ground to protect from cats. IMBED IN PLASTER OF PARIS UR feathered friends are seidom particu- #20 GAUGE STRAP IRON. à lar as to wherė they nest; a clean home è A SIMPLE FLOWER POT NEST painted in dull colors, and mounted in some Flower pot wren house, with thatched roof, looks well on isolated spot, will bring them. Only the in- any post. Shellac straw roof, and paint pot green or brown. genuity of the builder limits the unusual Imbed stick supporting straw roof, strap icon supports, and * ; 5 clay flower pot in plate or pan filled with plaster of Paris. designs possible for a bird house. Inventions for May 103

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uild a Suspension Orailer TAPERED BEAM SCALE IN FEET OLD FIRE TRUCK WHEELS 48” DIAM. R i g ANGLE IRON BRACE Ss E 5 Upper left: Completed suspension boat trailer is very light, and easily pushed along beach. Hookup is held by man. 104 Boats weighing up to 600 pounds can be launched or taken out of water in 10 seconds with this easily built suspension trailer. Tremend- ous leverage of beam allows a man to raise a heavy boat into position. Coast Guard men drag boat trailer along beach with ordinary car, run trailer into water by band, and launch it in less than ten seconds. A 20-ft, Coast Guard boat suspended from the trailer. Steel cable carries most of 600-lb. load, permitting small beam. A CALL comes in to life guard headquar- ters that a small boat is in distress off some lonely spot on the sea beach. Lives are in danger, and every second counts. A seaworthy patrol boat must be picked up on a carrier on a moment’s notice, towed by automobile to a point on the beach near the scene of the accident, and hurriedly launched in the surf. George Watkins, chief of the Santa Monica, California, Life Guard Service, solved this problem by designing the sus- pension boat trailer. With it a 20-foot dory or skiff weighing more than 600 pounds can be lifted from the ground or shallow water into carrying position in less than 10 sec- onds by ONE man! The launching of a boat requires even less time. The suspension boat trailer is, primarily, a long, reinforced wood beam, fixed upon a steel axle which has been raised sufficient- iy high above the wheel hubs to clear the ends and freeboard of the craft to be car- Modern Mechanix and

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SHACKLE STEADYING for ‘Your °Boat > PAUL we ARTNER RING BOLT aes, CABLE CLAMP — _ z CABLE CLAMP——27 iif 2” STRAP IRON TRUSS BOLT 18” HIGH oP = MOVEABLE HOOK 1” ANGLE IRON GRACE WELDED JOINT TO Zo UPRIGHT HOOKUP 48 WHEEL ANY STURDY] LARGE DIAMETER WHEEL FIXED’ MAY BE USED HOWEVER STEEL HOOK (SEE PHOTO ABOVE) " ide ROPE ~+ 3” STEEL I BEAM BRACES e Close-up view showing steel framework of trailer. Frame- work is padded to prevent boat from being scratched. Fire engine wheels are used here, but large auto wheels will do. ried. The rig is simply rolled above the boat, and a fixed hook at the rear extremity of the beam is joined to a steel ring or loop of heavy line attached to the stern of the craft. The leverage of the beam makes it practical for a man of average weight to raise the stern of the hoat. Then a movable forward hook is readily fastened to a ring in the bow, and the lift has been accom- ‘plished in a very few seconds. Lines dropped from the axle are tied to the gunnels to snub side motion. The weight is so balanced that a single man can raise the Inventions for May 3” STEEL UPRIGHT GEE PHOTO BELOW.) HEAVY STEEL AXLE STRAP 3” STEEL AXLE IS ĝ MADE WIDE ENOUGH #N\ TO ACCOMMODATE * BEAM OF BOAT IT IS INTENDED TO CARRY. STEADYING ROPE SHACKLE STEEL STRAP 3” WIDE TIE BOLT 3” STEEL DETAIL OF TRAILER HOOKUP AND WOOD FILLER (ON TOP ONLY) WELD. a ANGLE IRON BRACE STRAP IRON BRACE, Another view of trailer frame, showing how steel braces from beam to axle add rigidity to the suspension assembly. forward end when hooking the trailer to an automobile. Since this carrier was designed to accom- (Continued on page 124) 105

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New ©Ghrills With Infra-Red ‘Photography Above—A landscape taken on an infra-red plate. Note that green tree leaves appear white and that sky is darkened. The photograph suggests tonal ‘effects of a moonlight scene. At right—Unusual effects obtained on an infra-red plate of the start of an international balloon race. Note beautiful cloud reproduction and unusual contrasts. Clouds in- visible to observers are clearly shown on infra-red photographs, since they reflect infra-red rays of sunlight, Photo copyright by Walter I. Burton. by Walter E. Burton NEW sensitizing dyes have made it pos- ‘sible for manufacturers to offer amateur photographers improved infra-red sensitive films and plates that make invisible-light photography as simple as the ordinary kind. The only additional equipment you need for using such plates or films is a suitable red filter, costing a few cents. Sensitive Plates Available One plate manufacturer offers three kinds of infra-red sensitive plates in the popular sizes and at moderate prices. The one of most interest to the amateur is the Type I-R plate, a newcomer. It is recommended for use when photographing landscapes, for recording views ordinarily obscured by atmospheric haze, for photographing docu- ments to detect alterations or forgeries, and for photographing hot irons, stoves and such things by their own heat rays, heat being a form of infra-red light. When mak- ing pictures of distant landscapes or similar objects in bright sunlight, exposures as short as 1/25 second at lens stop f:4.5 can be given, using, of course. a suitable red filter. Two other plates not as well suited to 106 Photographing hot stoves and flatirons by their own illumination; making snapshots of scenes hidden by fog; and striking cloud effects await amateur who tries infra-red photography. amateur use as the Type I-R, but neverthe- less useful at times, are the I-P and I-K types. Type I-P is suggested for making total-darkness pictures. Photographs of ‘ landscapes and distant scenes can be made on the I-K plates at a shutter speed of 1/5 to 1/2 second at stop f:4.5, with a Wratten A, No. 25 filter. Owners of miniature cameras employing motion picture film can obtain 35-milli- meter negative material that is sensitive to infra-red light. Best Color Filter The best filter for all-around use with infra-red emulsions is the Wratten A, No. 25, or one having similar characteristics. It is the type employed for infra-red snap- shots with the Type I-R plates. It passes considerable visible red light, as well as the invisible infra-red. The No. 87 Wratten filter, which transmits no visible light, is used only with the Type I-P plate for total- darkness work. Some of the unusual effects are obtained by infra-red light. In landscape work, the blue sky records dark or black. Clouds, (Continued on page 124) Modern Mechanix and

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Sturdy Bench Lathe Made From Old Connecting Rods K Di ODEL EF". Fx FAN PULLEY: Old auto parts are used te make this bench lathe and chuck. Replacing Small Motor Bearings EARINGS on electric fan motors and other small motors can be replaced at little cost when they become noisy and worn. Remove the motor end plates, and drive out the old bearings. Wrap paper tightly around the armature so that it is accurately centered between the field poles. Place enough washers on the armature shaft at each end so-that when the end caps are re- placed there will be no end play. Tighten the end caps, turn motor in vertical posi- tion, and pour molten babbitt around the shaft for each bearing in turn. The babbitt bearings will be absolutely accurate. SHAFT IS CENTERED BY WRAPPING PAPER TIGHTLY AROUND ARMATURE BEFORE æ- NSERTING IN FIELD " POUR BABBITT Ë AROUND SHAFT DRIVE WOOD PEGIN OIL DRIVE OUT OLD BEARINGS New babbitt bearings are easily made for small motors. Inventions for May REALLY good looking bench lathe can be made in a few hours at practically no cost, if a few old Ford parts and pipe fittings are to be had. > 3 No. 1 on the drawing is a 36” length of 1” pipe, forming the lathe bed. Nos. 2, 3, and 4 are pipe fittings. No. 5 indicates four Ford T connecting rods with the babbitt removed, used as headstock and tailstock. The V-type pulley, No. 6, is drilled for a %”" shaft. The spindles, No. 7, are made from Ford wrist pins, and the centers, No. 8, are turned from cold-rolled steel shafting. Make these a sliding fit for the wrist pins. The chuck, No. 9, is made by reaming.a fan pulley to a snug fit for the head stock spindle. Four %4” holes are drilled around the face of the pulley and threaded for 1” machine bolts. For a longer tool rest use a %” length of shafting through the wrist pin holes of two connecting rods. Use a file as cutting tool when turning metal on this lathe. New Uses for Old Bottles A. M. Watt, ingenious Hellywood glass man, makes his living by converting old bottles into decorative beverage sets. Bottle tops are cut off, and bases decorated with bands. MPTY bottles that have outlived their original use can be converted into many useful and decorative objects. Ginger ale bottles, with their stems cut off, make fine, substantial beverage sets. Colored medicine bottles can be filed off for tricky flower bowls. Smart wine glasses are made by cutting off the necks of bottles and screwing them upside down into metal bases. For more decorative work engraving equipment is needed. Smart monograms can be cut in clear glass or frosted surfaces, and silver or gold bands added. Thick bottles are cut off by first heating with a loop of red hot wire, then dropping in cold water. The glass cracks neatly along the line traced by the wire. 107

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Glass Jars Save Shelf Space on Workbench MALL glass jars have been found very handy as con- tainers for bolts, nuts, washers, and other small work- shop parts, but often shelf space for the jars is limited. Simply fasten the screw-tops of these jars to the bottom of some shelf or joist near the workbench, using two small nails or wood screws. Each container is thus readily accessible by a mere “twist of the wrist,” but. out of the way in space otherwise wasted.—R. Eyrich. Cutting Cardboard on cLaSS ar NUTS-BOLTS the Bandsaw i BLOCK OF HEN making paper or cardboard models of boats, y, PLYWOOD it is often difficult to cut out the irregularly-shaped pieces with a razor blade or scissors. A bandsaw works well with heavier cardboard, but for thin pieces the blade vibrates too much, leaving a ragged edge. Take a piece of %” plywood, and cut it part way through on the bandsaw. Using this plywood as a saw table, it will be found that the narrow slit stops all blade vibration.—J. B. Jones. nero Using Short Drills in Chuck OF ROD. Soe drills sometimes slip upwards in a drill-press chuck, especially when the chuck is a bit worn or too much pressure is used when drilling some heavy material. This can be stopped by cutting a short piece of rod, of a diameter slightly less than that of the drill being used, and slipping it into the chuck before inserting the drill. By this method shortened drills can be made to give many more hours of service.—John E. Serafin. Useful Little ‘Hammer Made From Water Faucet NEAT and useful little hammer for the model craftsman is easily made from a dis- carded water faucet handle. File or grind the rounded ends flat. Fasten a handle 7” long and %” in diameter tightly in the screw-hole. Although the metal is rather soft, it will drive pins and brads nicely.—Chas. McFarlin. Bricks Will Absorb Excess Water in Cement HEN mixing concrete, too much water is some- times poured in. More sand or cement may be added to offset this, but in many cases it is not desirable. A few ordinary bricks, thrown into the mortar, will absorb enough water in a few minutes to make the concrete workable.—W. Mattson. THROW DRY BRICKS INTO CEMENT MIXTURE Safety Pins | sca se Hold Washers ECHANICS, electricians, and radio fans have all j RIVET BURRS experienced the difficulty of trying to find small Ant | SMALL MACHINE NUTS, ETC. cotter pins or nuts in boxes containing larger parts. Common safety pins are the solution for this problem. Use a separate pin for each part, and thread on the tiny parts as shown in drawing.—John M. Polivka. 108 Modern Mechanix and

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New Uses for Old Auto GENERATORS TO 32 VOLT D.C. LINE NLY a few changes in wiring are neces- sary to convert a Model T Ford gener- ator into a powerful 32 volt d. c. motor for farm power plants. The motor will drive’ a bench grinder or small shop tools at around 1,700 r.p.m., will draw net over 10 amperes at starting, and will use very little power when running light. . First rotate the entire brush holder to a position where the large brushes are equi- distant from the top of the generator. Connect the field coil lead closest to the tep fo the insulated terminal, and the other TO 32 VOLT D. C. LINE An old Ford generator makes a speedy moter fer driving a bench grinder cx other small shop tools. Above is schematic diagram of the generator rewired as a-32 volt d. c. motor for use with farm power plants. Brushes are as above when looking at brush holder end of assembled generator. lead to the large brush which is at left after the brush holder is rotated. The other large brush is already ground- ed to the frame, so nothing need be done with it. The movable brush is not used, and can be removed. Replace the generator end assembly. Connect termina! at top of generator to plus side of 32 velt d. c. lines, and fasten the negative side of line to the generator frame. Start the motor, loosen the four screws of the brush holder, and rotate the holder a few degrees each way until the setting for greatest power and speed is obtained. Making a Speedy 110-volt A.C. Motor From Old Ford T Generator Ae alternating current induc- tion motor can be had for absolutely no cost, if you have an old Model T Ford gen- erator at hand. The motor will run at around 1,500 r.p.m., more than fast enough te drive a bench grinder or light shop tools. It doesn’t draw more than 300 waits even when fully loaded. Remove the end cap containing brushes, and dis- connect all leads. Remove the wire running to the ter- minal post, and the terminal screw. Run the two field coil leads out through the thick fiber washer in the terminal post, en- larging the washer for May FIBER TERMINAL WASHER LEFT IN MOVABLE THESE TWO BRUSHES TOGETHER THIS BRUSH NOT USED Inventions hole if necessary. Connect these leads to an extension cord and plug. Connect the movable brush to the large brush which is on the left side when you are facing the brush end of the assembied generator. The other large brush can be removed. Rotate the movable brush until best speed is obtained. $5, for Your Generator Idea MANY new uses can be found for the old automobile starter and generator motors which are now so easy to get. Perhaps you have your own pet convers.on which might be of interest to other M-M readers. MODERN MECHANIX AND INVENTIONS editors will pay $5 for each accepted story telling cf a new use for any common type of car starter or generator. Be sure to send clear diagrams and give approximate | results obtainable from your converted equipment. I Suggested uses are as electric outboard motors, wind | driven battery charging generators, midget car electric moters, lathe headstocks, bench grinders, and higher voltage motors and generators. Address contributions to Auto Dept, Modern Mechanix Publishing Co., 529 So. 7th St., Minneapolis, Minnesota. Manuscripts which cannot be used will be returned if a stamped envelope is enclosed. 109

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Entertain ds A steel ball rolling around on paper over plate glass spells out “spirit”? messages in a mystifying manner. by DICK COLE NYONE can display . “supernatural” powers before a group of friends, put on a pseudo-occult demonstration which defies all natural laws, and call upon the “spirits” for advice and mystic messages. In calling for spirit messages, the room is darkened, with only a weird blue light to cast grotesque shadows. Trick Is Simple In the center of the table is a sheet of paper over a square of plate glass, with a black steel ball resting on one corner. Monotonously chanting mystic unintel- ligible words, the “medium” demands a message of the spirits, in answer to a query from someone in the audience. As the spectators watch the ball, it quiv- ers—moves—leaves a black trail in its wake! The trail forms letters—words—a message on the smooth glass! The secret is this. First of all, the ap- parently solid steel ball is hollow. It is coated with lamp-black, which forms the trail of black on the glass. Beneath the table is a powerful perma- nent or electro-magnet, supported by a pan- 110 PAINT CARBBOARD. UT WITH SODIUM? SALICYLATE | ‘DIP HANDS IN RON AMMONIUM | SULPHATE «|THE HAND OF Big90 . £68 Performer washes hands in seemingly clear water, presses one hand on ordinary white cardboard, and bloody red imprint of human hand is immediately formed on cardboard. tograph arm which extends back through a hole in the curtain to the pantograph as- sembly on another table. A confederate writes out the messages with the tracing point of the pantograph, and the moving magnet pulls the hollow steel ball around on the glass. Ordinary wood laths can be used for the pantograph arms, the distances being easily determined for the desired size of writing after a few trial settings of the arms. A popular East Indian Yogi trick is the “Hand of Blood.” To prepare for this, paint or spray a piece of cardboard or cloth with a solution of sodium salicylate. Prepare a solution of iron-ammonium-sulphate. Show the cardboard to the audience to Modern Mechanix and

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“Pseudo-Occult eMagic Tricks = BALL MOVES a UP OR DOWN 3 BALL WITH DIFFERENTIAL] PULLEYS DUMMY UMMY CORD. PASSES LINE PASSES joones | = RO UNDER FLOOR LOW: HOOK AERIAL IN O e a PHONE BASE.“ ==> à Alto AERIAL iN |; PHONE BASE Wireless telephone for conversing with “spirits” is not at all mystifying toa radio fan. Crystal set, connected to receiver, is concealed in base of phone, using circuit shown above. prove it has not been colored beforehand. Clean your hands of dirt by washing in the clear sulphate solution, and press one hand earcfully on the cardboard. The chemical on the hand, coming in con- tact with the treated cardboard, produces a deep red stain—an impression of a bloody human hand! “Ectoplastic magnetism” can be demon- strated in a slightly darkened room. A shiny, chromium-plated ball ahout eight May Inventions for Author of this article demonstrates “ectoplastic magnetism” by making massive steel ball climb up string in defiance of gravity. Sketches at left show how it is done. Con- federate pulls gently on lower cord to make ball climb. inches in diameter is threaded on a cord extending from ceiling to floor. The ball rests on the floor, but is free to slide up and down the string. The “medium” stoops and places her hands about six inches above the ball. Slowly raising her hands, the ball climbs up the cord in defiance of gravity. Balf Is Hollow The mystic ball, seemingly of massive steel, is really a metal shell. The cord does not pass through the ball; each end is wound on a drum turning on a cross-shaft within. The drums are of different sizes, the lower cord winding on the larger drum. The small leverage obtained here is suffi- cient to make the ball climb when the lower cord is pulled. This cord passes through a dummy knot on the hollow screw-eye, down through the floor to a remote point where a peeping confederate moves the ball in unison with the operator’s hands. “Spirit messages” can be received over an ordinary telephone entirely disconnect- ed from the line. A miniature crystal set, built into the body of the wireless tele- phone, is connected to the receiver. The transmitter is located in another part of the house, and the sending aerial run up through the floor to the table. A microphone concealed in a vase of flow- ers picks up the words spoken into the telephone and brings them to the “spirit.” 111

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BREAKFAST CABINET for the Cottage 3" FACE STOCK P C5 PLYwooD COPING TO MATCH a BOTTOM 16"x 24 " 3 X 2" CLEAT ON ALL FOUR SIDES 3" a SIDES ONING A ‘BOARD.IN/7 OPENED} | POSITION ò o e > The ironing board is built right into the side of this handy kitchen cabinet. It is hinged to a small door, so that it swings out into the room where there is plenty of light. A hinged leg automatically drops into place as the board is let down, to support outer end. Padding is nailed to top only. - 112 1” X 4" TRIM X 2"CLEATS UNDER ALL f i $ f kep { F i i This modernistically designed cabinet looks well in any apartment, There’s room for three on the built-in table, which folds up to completely hide food and dishes. RoR cottages and apartments, this break- fast cabinet, no bigger than the case of a grandfather’s clock, is ideal. Closed, one would never suspect that all the china, tableware, and pans for making breakfasts and lunches could be contained in such a small cabinet. There are shelves for a toaster, chafing dish, electric grill, iron, and all the tableware and pans, with plenty of room left for bread and other light supplies. Beneath is room for a dishpan and the bulkier necessities of light house- keeping. A dining table and ironing board are so ingeniously built into the cabinet that they are hardly noticeable. The table, when folded, is a door which effectively conceals the breakfast dishes. In the open position a dining table for three is presented. Lumber and hardware costs for this cab- inet should not run over four dollars, since clear white pine is used throughout. For the side boards two pieces %4”x16"x5’ are needed. Narrower boards may be glued together if the 16” widths are hard to get. Select the side which will be most con- venient for the ironing board, and lay out carefully the outlines of board and small door beneath, which are to be cut out of the side. Note that the bottom of the ironing board is 26” above the floor. Saw out the board with a sharp coping saw, making as smooth a cut as possible. Do not sand the sawed edges; a coat of paint on the sawed edges will just about conceal the thin saw cut if care is used here. Use a long brass hinge for the ironing board, and two small hinges for the door. Pad the ironing surface in the usual man- ner, tacking the material only to the top of the board. Screw the top and bottom pieces, of 3%.” x16”x24” pine, to the side boards. Use (Continued on page 120) Modern Mechanix and

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Simple Typewriter Eraser Tray Catches Grit HE moving parts of a typewriter soon become gummed up if grit from the eraser is allowed to drop into the mechanism. A simple tray mounted in a position to catch this grit will save many repair bills and greatly prolong the life of the machine. Pieces of thin sheet brass are easily cut and soldered into a tray 14%4"x%%"x\" deep. The mounting should be placed on ma- chine as shown. —J. E. Hogg. Hotel Rooms Sold From Photographs y iy Hint f HEN photographs of the different kinds of Ag rooms available in a hotel are neatly dis- Rem Img played at the desk in the lobby, transient room- iI AE ers will have no difficulty in choosing rooms. =li YF HF Visitors can see exactly what type of room they ff al y will get, and complaints will be greatly reduced. | TA With a bit of attention to lighting, an amateur a photographer should be able to secure very ETE good room pictures with a medium sized camera. B Prints can then be enlarged.—John B. Behrends. A A HOTEL ROO! Gallon Tin Cans Make Pigeon Houses POTOSRAPHS PIGEON houses can be built in any quantity at practically no cost if a number of one gallon tin cans, such as those used for canned fruits, vegetables, or honey, are available. Make slits % in. long around top of can about 1 in. apart, bend out, and punch small hole in each with nail. Nail cans on boards, or directly to building. Cut a circu- lar hole in the bottom of each can, bending the tin down and rolling the end to make a smooth perch. File down any sharp edges. Eight or ten boards may = be nailed to one post, giving space for at least 50 BS CUTAND œA i rH pigeons.—A. H. Waychoff. Si N BEND AS oe Steel Shafted Pool Cues soa as TY Made From Old Golf MANY TIERS fl j a ut Clubs ye neat and practical cues may be made from the steel shafts of old golf clubs. File the slender end down evenly to fit into a small wooden plug. Leave a small beveled shoulder on the wood tip, so that several thicknesses of chamois skin or leather can be glued on. It is best to add about 10 inches to the length of the shaft, to give a cue about 50 in. long.—C. Bolstad. Testing Bad ADDED L elaca ctl tle tte Egg in Water STEEL SHAFTA i VERY simple yet positive method of testing eggs GAS FORMED requires only a partly filled glass of water. Place one egg at a time in a very wide glass or cup partly filled with water. If the egg stands straight up it can generally be considered over two weeks old, but if it remains in a horizontal position it is fresh. Gas is formed in the air space at the end of eggs when they are old.—Mrs. R. F. Lambert. ADDED LENGTH Inventions for May 113

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Beautiful Sierra Leone Stamps Show Liberation of Slaves QIERRA LEONE, mystical negro colony on the west coast of Africa, recently issued a beautifully engraved sel of stamps mark- ing the 100th anniversary of the death of William Wilberforce, famous English anti- slavery agitator, and recalling Britain’s act of 1833 abolishing slavery in all British colonies. U.S. 23 Year Old Stamp Still Sold UST step up to the postal savings window of your local postoffice and throw down a dime. If you decide you don’t like the stamp, buy nine more, paste them on a card, and you'll get your dollar back. 21 Soviet Peasant Scenes on Stamps Id black and brown: slave on seashore being freed from chains; 5d red brown and green: Bullam canoe sailing with wind; 6d orange and black: natives spearing fish from punt near Banana Islands; 4d brown: nurses aid native. Queer Ads on English Transfers DVERTISEMENTS listing everything from pigeon supplies to double seat trousers are to be found on the backs of English and Canadian tram tickets. It is customary in these countries to print only the different transfer points, thus leaving considerable ad space to be sold. Queer ads, gay colors, interesting slogans, all go to make transfer collecting one of the most interesting of hobbies. POULTRY ARGI ; A Ee 4 stamps from Russia’s ethnographic issue. There are peas- PIGLOGS ant scenes from Siberia, Uzbekistan, and other wild places. S i THE latest stamps put out by the Soviet Union comprise one of the most pictur- esque sets of stamps ever issued. There are 21 different stamps, cach depicting one of the many races which make up tbis great country. From the cold waste-lands of the Some of the queer ads seen on transfer tickets of England a and Nova Scotia. Face of transfer at lower right is 4 size. (Continued on page 116) 114 Modern Mechanix and

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WANTED. MEN FOR TEA-“ COFFEE ROUTES make up to 42:0 a NO EXPERIENCE NEEDED—I WILL GIVE YOU WHAT LITTLE TRAINING NECESSARY— NO RED TAPE—EARNINGS START AT ONCE The future welfare of thousands of deserving men who heed this an- nouncement may be vitally affected. Many who have been beset with Afnan- cial distress can find prompt and per- manent s relief from their money worries. FOR YEAR ’ROUND INCOME Stop and think how wonderful it would be to have a nice income every week in the year. No more tramping around looking for work. No more “penny pinching.’’ Have money to help pay your nagging bills—buy clothing—pay off the mortgage—buy yourself a home—put money in the bank—or whatever your heart desires. That's the kind of a business opportunity I am offering you. TEA AND COFFEE ROUTES PAY BEST Everybody knows there is nothing betler than . 2 good weekly route for a fine, steady income. These Tea and Cofee Rọutes pay fur better than most because you supply nearly 300 prod- ucts—things people use daily in order to live. You simply take care of the customers’ orders on the route in your locality. You collect all the cash and keep a big share of it just for looklng after tihe orders, delly- ering the goods, and taking care of the business. I furnish you with hundreds of fine premiums and spe- cial bargain offers — premiums to glye away with Coffee, Spices, Ex- tracts, Baking Powder and other fine produrts. Hundreds are now wniling to be served in many lo- ealities, Dally and weekly earnings mount steadily where you call on your route regularly. YOUR OWN FOOD PROD- UCTS AT WHOLE- SALE PRICES When I send you instructions for making money on my new nelghborhood Tea and Coffee Route Plan, I also give you rock-bottom whole- sale prices on your own groceries and house- hold necessities. This is in addition tọ your regular daily earnings, so you make big money in cash and save big money on the things you use in your home. GO TO WORK AT ONCE My new plan provides immediate cash earn- ings. As long as you are honest and reliable you are eligible for one of these routes. I want someone in every territory because I have opened up my big plant to full capacity. I am going to help a lot more people earn more A Tea, money at once. You can have one of these good paying routes right in your own locality right near where you live. Better send name today. EXPERIENCE OR TRAINING UNNECESSARY I am not nearly as much interested in your past experience as I am In your willlngness lo follaw a few plain instructions that will tell you the inside workIngs of this profitable busi- ness. I will explain just how you go about plac- ing Tea, Coffee, Splees, Extracts and House- hold Products with the customers on your route. I furnish everything. There is no stock to carry —you fill your orders from my big factory stock. You have entire charge of everything. NO MORE “PENNY-PINCHING”’ If you have been working for a boss and your pay has been limited and you are weary of Dinching and striving to exist, here’s an opporLunity to change all this. With my route plan you can stop time-clock punching forever. If you want earnings that run up to $42.50 g week you can have them. Your week- ly income is lim- ited only by the time you give to the business. The more time you de- yote to my wonderful Roule Plan, the more money you make for yourself. That’s the kind of an offer I am mak- ing to you. LOOK AT THESE UNUSUAL EARNINGS Tam receiving glowing reports from both men and women who are already handling some of these routes, M. Mitchell, Cal., reported prefits ot $75.00 in six days, Wm. E. Berkhi- mer, Pa., cleared $20.00 in one day and $90.00 in a week. Wm. H. Newcomb, N. Y., made $24,00 in one day. Wm. E. Walker, Conn., made $68.00 dur- ing spare time In three days. I have many more re- ports like these exceptional earn- ALBERT MILLS, Plan. to me. TERTENIA z p 3 me FORD SEDAN FURNISHED TO PRODUCERS AS AN EXTRA BONUS NOT A CONTEST OR A PRIZE President 5018 Monmouth Ave., Cincinnati, Send me full particulars of Tea and Coffee Route showing how I can get started earning up to $42.50 a week at once. (Please Print or Write Plalnty) week ings. I now offer you an even better oppor- tunity than I gave to them. FACTORY FRESH FOODS NOW IN GREAT DEMAND My Tea, Coffee, and other Food Products aro fresh from my big, modern Pure Food Kitchens—all have been tested and approved’ by the American Testing In- slItute—a very high authority on quality. It’s no wonder People insist on having my brand in preference to others, I'll explain all of this more Fully in the big booklet that I will send you free just as soon as I get your name. My goods have been advertised nationwide to millions of peo- ple. There is nothing new or untried about any of my plans, DON’T SEND MONEY— JUST YOUR NAME Don’t confuse this with anything you have ever read before. I don't need your money— Need people to operute gond paying routes. Send me your name so I can lay the facts before you, then you can decide if the earn- ing possibilitios are satisfactory. Don’t exnect me to walt indefinitely to hear from you. If you act promptly it will indicate you ate the right person for the, Toute. Send name -on coupon or penny post- card for free facts, Do it today. : : THINGS TODO 1. Mail Coupon 2. Read Facts x 3. Start Making Money at Once Ohio This is without obligatlon GDC Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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ASTOUNDING aA AWAIT YOU Your destiny is NOT in the hands of the Gods of Luck or Chance. Don’t be a slave to conditions—like chaff im the wind. You are endowed with mighty MENTAL and PHYSICAL POWERS. These powers are lying dormant, unawakened, within you. A few. simple rules: used every day will the means of bringing about lasting HEALTH, HAPPINESS and FUL- FILLMENT OF YOUR IDEALS. THE WAY A world-wide movement, the Rosi- crucian Brotherhood, for years has shown sincere men and women how to use their INNER FACULTIES to overcome LIFE’S OBSTACLES. Why look around for help?—within is the solution. FREE INTRODUCTORY BOOK Sincere seekers may secure a new book, “The Wisdom of the Sages.” it explains how you may receive the secret Rosicrucian teachings in the pri- vacy of your own home. It tells how YOU may learn of the wonderful laws used by the Rosicrucians throughout the world. If thousands have been helped ‘by this study, why not you? Address a letter (not a postcard) to: FRIAR R. S. C. ROSICRUCIAN BROTHERHOOD SAN JOSE CALIFORNIA Remember the Rosicrucians are NOT a Reli- gious Organization. GO TO HIGH SCHOOL AT HOME Mar up the education you missed. Study at home in spare time; Your choice of sub- jects.. Expert instruction. Personal service. You make quick progress because you are in a class: by. yourself. Diploma. Mail coupon today for interesting FREE BOOKLET. INTERNATIONAL CORRESPONDENCE SCHOOLS The Universal University’ Box 2924-W, Seranton, Pa. Without cost or obligation, please send me full particulars about the course I have checked— . O High Schoot Course : O English Bookkeeping Ū Civil Servico Accounting Salesmanship Advertising Tuning Up Your Car for Spring (Continued from page 85) front body bolts. These are the bolts located at the feet of the dash board supports. Con- tinned tightening does not remedy the noise —but proper insulation will. Remove the bothersome bolts and clean and oil them. Then cut a strip of old innertube, so that when folded to two thicknesses it may-be in- serted between the frame and body. This may be easily done by spreading the mem- bers apart with a pinch bar. Then reinsert the body bolts, drive them through the rub- ber, and tighten securely. Now tighten all other bolts and screws— those found on and under the dash, door hinges, window frames, steering wheel sup- port, radiator holddowns, floer boards, fen- der and running board. Take up all play in the tie-rod and drag-link assembly of the steering control. A good polish job is a good investment, for the time and money spent. A combina- tion cleaner and polisher does a splendid job—a coat of wax over the cleaner makes a‘ better and more lasting job. Rocket Men to Invade Stratosphere (Continued from page 51) rocket and maneuvered a safe landing. The ascent lasted 10 minutes and 26 seconds. Equipped with a knowledge of the ex- periments of all their contemporaries, the Cleveland rocketeers are ready to make prog- _ ress with their own design which they think ‘will have greater practical value than the products of the scientists across the sea. In the final test of the model, Loebell stood behind a steel shield—mindful of. the fate of other rocket-workers in dealing with the _highly volatile gas combinations—and ad- justed the fuel valves. When everything was adjusted, Loebell warned everybody except Hagna to with- ‘draw to a trench so they might: watch the et through a slit in a heavy wooden barri- cade, Loebell raised his hand in a signal to Hanna. The latter pressed an ignition switch connected with the combustion chamber. Tongues of yellow flame shot from the exhaust, changing to a bluish-white streak as Loebell readjusted the fuel valves. The staccato explosions of the exhaust became a dull drone. The motor tugged violently at its fastenings. Combustion lasted for five minutes, indicating that the completed rocket would easily have attained a five-mile alti- tude. The completed rocket is expected to be fifteen feet high. When shot from the bot- tom of a thirty-foot shaft, its inventors hope to penetrate fifteen miles into the strato- sphere, The shaft is necessary to give the rocket direction. When the rocket reaches ` the peak: of its arc and starts falling, a délicate “trip” trigger will release a parachute to lower the rocket gently. to earth. Thank You for Mentioning Modern Mechanix and Inventions for May: When Writing to. Advertisers

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This little invention has brought E7 RTA of | thousands of men WITHOUT the Mas- sage Bar, the pres- sure of the blade naturally wrinkles the skin, which thus presents an uneven surface, And Now You Can Try This Revolutionary Shaving Improvement —at almost no cost! © Send only 25 cents and you will receive a genuine Christy Razor with Massage Mar, and 3 Christy hand- finished blades, one in razor, 2 in separate package, all complete in handy container. Though the cost is only a quarter, your Christy will give you as fine a shave and as lasting service as any $1 or $5 Christy Razor. Try it—if not fully satisfied after 10 days, your money back. m @ The Massage Bar is only one of many outstanding features of the Christy Razor. In using ‘the razor, note the. ‘‘balance’’ and ease of han- dling, the positive positioning of the blade—no ‘fussing’ or ‘‘fixing’— and the keenness of the hand-finished blades. You'll enjoy the mechanical perfection of this scientifically de- signed razor—tho razor men are turning to for a quicker, easler, more comfortable shave. NATURAL POSITION @ Handle the CHRISTY in the posi- tion in which a razor is NATURAL- LY used. This gives the long, diagonal stroke that the barber uses, You'll be amazed at the time saved and the wonderful results secured. SHAVE CLEAN AROUND NOSE AND MOUTH @ Don’t worry any longer about shaving clean around the corners of the mouth, under the nose. or in any other of those hard-to-reach spots. Just try the CHRISTY and note the difference. Try the CHRISTY The Massage Bar smooths the way, like the barber’s fingers—eases the shave—you hardly feel the blade—keeps skin from chafing— does away with after- shaving irritation. WITH the Massage Bar, the skin is smoothed in advance of the blade, which thus cuts the beard squarely at the basa on a taut surface. 3 For a new ex- : perience in shaving— try the CHRISTY “LIGHT. as-a~-FEATHER” shave, SEND ONLY 25 cents — (mr offer goody i { The Christy Company, Fremont, Ohio. x: (Fm5 gfe sood For enclosed 25 cents (stamps or coin), send me Christy Razor with 3 Blades Mail this coupon- RAZOR @ —the product of special- ists of 25 years’ experience in designing and making fine razors and razor blades. Shave with your Christy for 10 days. If at the end of that time you’re not fully salisfied. return it and we'll refund your money. The CHRISTY Co. Fremont, Ohio socit Hand-Finished Blades With your Christy Razor you get 3 of the genuine Christy Blades, made of the finest quality heavier- than-ordinary steel; fin- ished by hand and packed by hand in a way that protects the fine edge. Christy Blades are sold by dealers everywhere, postpaid. If, after 10 days’ trial, I am not fully satisfied lhat the Christy gives me the best shave I ever had, I will return the razor and you will refund the 25 cents. Address ....,...+. City .... Cece ea ner en ener n reese eesaretereete DLEeesereeceenrerenncs . agoe Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers 119

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LOOSE HANDLES QUICKLY MADE TIGHT IX a little Smooth-On No, 4 1 into a putty, put this into the opening, force the parts to- gethér, and in a few minutes the metallizing of the Smooth-On produces lasting tightness. Such repairs cost only several cents each and save many dollars otherwise spent for renewals that are no. better. In addition to quick, effective replacement of loose handles and knobs as suggested in the sketches,.Smooth-On No. 1 en- ables you to stop leaks at cracks and joints in steam pipes, radia- tors and boilers, in water pipes and tanks, in gas pipes, in auto- mobile radiators, engine water jackets, hose connections and in gasoline and oi! lines, to make loose bolts, nuts, screws, etc., permanently tight. Smooth-On No. 1 after set and metallized holds water; steam, gasoline, oil, etc., under any pressure, and may be ap- plied with equal success to any metal. It is also used for anchor- ing and tak- ing up loose- mess, and holds in ma- > sonry, tiled walls, slate, wood, etc. By doing your own household and automobile repairing with Smooth-On No. 1, all the Smooth-On repairs you make in a year will probably cost you less than any one of them made by a professional mechanic—and you will be surprised at the ease of application and the number of places where Smooth-On can save money. Keep a can of Smocth-On No, 1 in se Sarno WS a ee Home 4 AUTO - -REPAIRS Write for your tool pee and be ready for oe gencies. Do your own repairing an FREE BOOK sit the end of the year you will find that your efforts have been hand- somely rewarded. _ The free Smooth-On Repair Book gives full instructions. Get Smooth-Ou No. Lin 7-0z., 1-Ib. or 5-lb. tins at nearest hardware store or tf necessary direct from us. ST SMOOTH.-ON MFG. CO., Dept. 69 574 Communipaw Ave., Jersey City, N. J. Please send the free Smooth-On Repair Book. Study Clouds to Forecast Weather (Continued from page 63) Light drizzling rain often falls from alto- stratus clouds, a high, gray sheet through which the sun may be faintly seen. Clouds must really be observed on the horizon to the windward in order to be of value in forecasting, for when overhead the weather that goes with them is already present. Often cumulus clouds may be over- head, but by watching the horizon to wind- ward the cumulus may be seen to become dark and ragged on the bottom, changing to cumulo-nimbus, which means rain. The appearance of the sky at sunrise and sunset is quite accurate in forecasting. A red evening sky indicates fair weather, while a sunset of green or yellow may be taken as an exceptionally favorable sign. For those who get up: early enough, the sunrise also has something to tell. A gray, gloomy sunrise is a good sign, while a bril- liantly tinted sky at sunup means that con- ditions are right for rain. The appearance of the moon and stars indicates the amount of moisture in the air. When the outlines of the moon are sharp and the stars. are seen distinctly the weath- er will be fair. When the stars twinkle and the moon appears hazy conditions are right for rain or snow. Bodyguards F ace Death (Continued from page 81) became the vogue among affluent lovers of home-like surroundings. The requirements of the profession are varied. A man must be courageous and have the physical strength to back up that cour- age. He must be educated and refined so that he can accompany his employer wherever the Jatter might go without finding the situ- ation embarrassing. He must be able to wear clothes for all occasions. And he must divest himself of any personal. ties which: might suffer through long and unrelieved hours of service. For the comfort of his client and the advantage it gives him over a scheming criminal, a bodyguard must look as incon- spicuous as possible. A Breakfast Cabinet for the Cottage (Continued from page 112) 1°x4” trim stock for the front door frames, and a 6” coping board at the bottom along front and side. The back of the cabinet may be of inex- pensive %” plyboard. The 1714” wide front table will probably have to be made by gluing two narrower boards together. Use a 17%” length of piano hinge or three short brass hinges for this. A half round top is made of two semi- circular plywood pieces capped by 1/16” plywood. Soak the plywood in hot water for a minute, and it will bend easily around the curve. mae Thank You for Mentioning Modern Mechanix and Inventions for May When Writing co Advertisers

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UTOR: DATIN 150 GALLONS of GAS Elling 0. Weeks, Famous Aviator and Inventor, Tells You How to Get It Automobile owners who have been worrying about gasoline expense, will be interested in an amazing invention that is now being offered to motorists by this famous Aviator. Already hundreds of thou- sands of cars have been equipped and their own- ers are wildly enthusiastic in their praise. 51 Miles on a Gallon Wins Contest In an amazing test recently conducted by a Texas Motor Company, 23 cars were entered to determine mileage economy. The winning car, owned by Mrs. C. P. Blalock, pictured to the left, ran 51 miles on a gallon of gas, and the second car 49 miles on a gallon of gas. When official test records were published, it was found that both of these cars were equipped with Mr. Weeks’ invention. Amazing Gas Savings on Big Cars Owners of big cars need this new invention just as well as the owners of the smaller cars; the bigger the car the worse the gas eater and the more need of this saving. Emery Shaffer, 3826 N. Ashland Ave., pictured here, the chauf- feur of a well known Chicago business man, says he is delighted with this device. Not only does it save him many gallons of gas every month but makes his car perform beautifully. Here is Mrs. C. P. Blalock in her Ford _ car that ran 51 miles on a gallon of gas. Emery Shaffer and Packard Limousine he drives. How You Get 150 Gallons for $4 The average automobile is driven probably 10,000 miles a year. Conservatively figuring this new device on 10,000 miles, it should save you anywhere from 150 gallons of gas and up, but figuring at the minimum—150 gallons of gas —this device only costing you $4.00, it is as easy as A BC to see that $4.00 does buy 150 gallons of gas, besides how about the second and third year when gasoline savings continue and there is no cost whatever. Make this test. No matter what kind of a car you have or how big a gas eater it is, this device Must save you money. We guarantee that if it does not give you more power, faster pick up, less carbon, quicker starting and increased mileage a trial will cost you nothing. We invite you to test it at our risk— you are to be the sole judge. Mail free offer coupon today. ELLING O. WEEKS, Pres. The Whirlwind Co. Dept. 991-A Station C Milwaukee, Wis. oct: Thank You for Mentioning Modern Mechanix and Intentions for May When Writing to Advertisers . FREE OFFER COUPON Re ce) ea WHIRLWIND CO., | Dept. 991-A, Station C, Milwaukee, Wis. Gentlemen: You may send me full particu- lars of your Whirlwind Carbureting device and tell me how I can get one Free. This d does not obligate me in any way whatever. ‘to Check here if you are interested in full or part h l U s salesman position. EE ġa eee eee eS ee eS ee ips. 121

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‘YOU CANT \ BEAT OUR PRICES y And we defy anyone to excel our quality. Every standard brand tire reconstructed by our superior, 4 modern method ig positively guar- anteed to give full 12 months’ service under severest road con- ditions, This guarantee is backed by the entire financial resources y of an old reliable company Todaya Lowest Prices BALLOON TIRES fd Tubes $0.83 85 D os nna NOdbhoorovomoanddo—7 emf NUNMOOTMGCIU In Seen EI DO BO bm eee OOOO Onin anea ca n cn en on enta n eren gan Tubes REGULAR co RD , i 2 a aa VOVVWVONNNN VNDOVVONN I O ONORRONODUÙ FD ie n w HEAVY DUTY T TIRE 34x5 Truck .. . 32x6 Sply. Tr. . 32x6 10 ply. Tr. . 9 36x6 Truck ... 34x7 Truck .. . 36x8 Truck... 1 40x8 Truck... 1 All Other Tru ALL TUBE $ A GUARANTEED BRAND NEW A 2.0-cm~oEas Give test POSEN NM, REVounse?, A MMR RINNAN Fi MONTHS order. Any tire falling Spire Wace) months’ service repiaced at half Petes GOODWIN TIRE oet -| MIRE & RUBBER COMPANY ®2 LSALI 1840 S. MICHIGAN AVE. CHICAGO, ILL BENE Soni | | How to Restring a Tennis Racquet (Continued from page 101) er size, it generally proves a bit clumsy. After the racquet has been fastened in the vise, the 19-foot length of string must be pre- pared. Wax string to. prevent fraying. If the racquet is drilled for 18 vertical strings, the center*of the main string will be | at the top of the frame, as in Fig. 4. If the racquet has a hole through the handle, it is drilled for either 16 or 20 ver- | tical strings; the main string must then be started as in Fig. 5 with the center of the string in the hole through the handle. Pro- cedure is indicated by grooves in frame. The gut should be strung through all the, holes; when putting in the outside vertical string on each side, however, skip one hole at the bottom as indicated at (A) in Fig. 7. The ends of the gut are inserted under the loops formed by the other strings on the out- side of the frame on both sides. Picks should be inserted in the holes marked (A) in Figs. 7 and 8, to prevent the gut from slipping. First one-half of the vertical strings are tightened, then the other. Standing on one side of the racquet, the restringer should grasp the center string nearest him with his left hand and pull it upwards and outwards. Tightening Last String The slack is taken up in the last string by moving the pick from hole (A) to (B), and removing the slack by pulling the string with pliers; then the pick is reinserted in hole (A). The picks should not be removed until half the cross strings have been installed. Repeated tightening will cause the racquet to assume a rounded shape, but the frame will regain shape as cross strings are put in. The cross strings are begun at the top end of the frame. The knot is fastened as in Figs. 9 and 10 on the fourth vertical string from the center. The string is then woven between the vertical strings. Each cross string is tightened separately by wrapping the string around the wooden dowel pulling tight, and securing with a pick. The pick should not be removed until the next string has been tightened and secured. If the gut breaks it can easily be spliced in the manner shown in Fig. 12. The gut (A) is kept from slipping by a pick. The broken end is cut off so that it projects about an inch beyond the adjacent hole. The new length (B) is inserted through the adjacent hole from the inside, and then turned and thrust back through the same hole, leaving a small loop over the broken end on the outside of the frame. The loop is pulled into the hole with a pair of pliers, drawing the broken end with it. The last cross string (there are usually 21 aJ Samo Quay aan = Curfit Complete with 9 5 or 22) is knotted. at the bottom to a vertical a 4 . . Easy to F caiing tote ettar ena i and Sesion: eng | string in the same manner as the top cross for Enis, profesnional outfit today. Good profits made restringling other string in Figs. 9 ‘and 10. Bey eae Pinch Soirel“withcontrasting ai im, Red Chineerated : : “T asy directions. Money back marentec. As a final touch, strings and knots should be given a thin.ceat of one part white shellac mixed with two parts of alcohol. MAKE Send check or Money Order $1.65 which MONEY T includes Postage and Insurance: Sent Too » If desired. 15c ex Pro Tennis Siting cae! Dept. W-2 “Harmon, N.Y. TOJ. Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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PYRO CULE Cbg INISHES Le Sa e aD, KAR-NU is a new, miracle discovery—a iransparent magic-like fluid with which anyone can refinish any color automobile easily, quickly and economically without polishing, waxing, rubbing or painting. JUST WIPE IT ON WITH A CLOTH! IMMEDIATELY dullness, discoloration. shabbiness, sun fade DISAPPEAR. IN- STANTLY, as If by magic, the old finish ts re- juvenated and reatoredto the lustre, lifeglowand beauty of the original factory finish. HAR-ND dries m15 minutes, sealing the pigmentand pro- tecting the finish from further wear. Lasta 8 to 12 monthe. GUARANTEED. ua} in beauty to e repaint or refinishing job which costs $25.00 to FREE SAMPLE [Not A Wax Polish or Paint Lasts 8 to 12 Months | Enormous demand! Millions wantit! Bowers made [GUARANTEED | $180 te fret to weaker Sel HAE-NU to individuela, fleet owners, garages, auto acces- Bory storen, used car dealers, ste, No experience ne-esaary. Write for FREE ssmple to prove our clalma and territory offer. MAR-NU CO. Dept. W-41 Oakley Station, Cincinnati, Ohio DERA MACH Made of metal, never burns up, no burnt ends, ashes or stubs to discard. Absolutely water-proof. Qne Mach guaranteed to light 1000 times or more, lights only on itself thus saving the Mmarring of clothing and furniture. HAVE YOU SEEN IT? If not, send $1.00 for 15 maches and counter display easel to- gether with salesman’s terms, convince yourself how readily they sell and make 50% profit. Single sample 15c. Every store a Prospective customer. Every persen a prospective user. Exclusive territory and steady business- guaranteed industrious salesmen. METALMATCH CORPORATION, 112 Water St.. Warsaw. TH. IOA Um Mae 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, III. Men Wanted at Once Make Money Calling on Stores New oceupation. Pays big money at once without investment. Introduce sensational new line ïe and 10c necessities to stores. Self sellers. -Permanent repeat business casy. Experience unnecessary. Start free. Write PRO-CO-PAX Dent. 37-W 1956 S. Troy CHICAGO — 00 Power American Made MICROSCOPE $6.00 Magnifying 500 times, this famous Winn Microscope also provides you with intermediate powers from 110% up in steps of 25X. This range of powers, in one instrument, enables you to vary the magnification in accordance with Your requirements, Refinements include compound lens sys- tem, clear definition, rack and pinion focusing, adjustable tilting stand, adjustable and removable mirror, additional Mirror mounting on movable stage, slide clips, substage color filter clips,etc.. Complete with prepared and_plain. slides and valuable instruction book, only $6.00 postpaid: EXTRA... Alerge and most complete biological set of dissecting instruments, slides, atalna, chemicals, color filters, instruction book, ete., included only $7.25 postpaid. $2.00 deposit required on C. O. D. purchases: J: H. WINN MFG. CO. a Winnerset Makers, Dept. 36, 124 West 23 Street, New York Eas Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers TURN SPARE HOURS INTO CASH! 49 Weekly fnYour Own Home No soliciting! No canvassing! We show you how to make big money decorating fast-selling Giftwares. We start you with the big $10 Aftist’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 Iireside Member says, ‘‘I made $100 on furniture in one week.’’ Another writes, ‘My sales were $500 for 5 weeks. This is my first year.” R. M. P., of IlL., says, “I did $3,500 worth of busi- ness last year and over $12,000 this year.” D. W., New Mexico, Teports, ‘E would not taltre $1000 for my Course.’’ No Experience Needed You too may havea guaranteed In- come opportunity. with Fireside. No tiresome study. You learn by doing. No artistic ability neces- sary. Our easy 3-Step Method makes- the wark easy to learn and easy to do and fits you to make gond money practically from the start. Quick Sales in Your Home No need to leare 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 caupon for details of new plan that pays for your Fireside Course besides putting big cash protitsin your pocket. Mail coupon now while openings for new members are still being offered. FIRESIDE INDUSTRIES Dept. 142-E Mich. Fireside Industries Dept. 142-E, Adrian, Mich. Send: me FAEE Book on Home Decorating fer aig steady income. Also details of plan that will pay for my Course and glve me-big profits besides. NAMB 2... 00.000 cece erences ERNEA KAET E ESE .

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Make Big Profits Filing Saws by Machine An Opportunity to earn up to $2 to $3 an Hour in your own cash business Start in spare time at home. No experience re- quired. You can do expert work ... = easily, quickly, without eyestrain, with a FOLE SAW FILER W. B. Menees reports, “Am using the Foley Automatic Filer with great success. Business is increasing daily due to the satisfactory work. ’’ M. S. Gray writes, “I file for the school system here, Telephone Co., Water Works, lumber yards and many others.” The Foley files ALL kinds of hand saws, band saws and cross-cut circular saws BETTER than expert hand filing—every tooth exactly uniform in size, No Canvassing. BIG SPECIAL OFFER —for timited time... save money. Sendcoupon NOW , .. noobligation, nosalesmen. FOLEY MANUFACTURING CO. 517-4 Foley Bldg., (1 Malin St. N. E., Minneapolis, Minny Send me FREE PLAN for starting my own business In spare time filing saws on the Foley Automalic Saw Filer and your BRIG Special Offer, without obligation to me. AUTO. NAME ADDRESS Home-builk Trailer Coaches. Our Blueprints with 2500 word directions tell you how to build this MODERN Traller Chassis. No welding. No lathe work. Nothing you cannot do in 3B) home work shop Possible saving $100.00, Blueprints lt! TRAILER ENGINEERING. Big New Book—Nine Chapters tell you about size, center of gravity, streamlining, indepen- dent suspension, retractile third wheels, parking and levelfn jack, „coupler yoke, all-steel chassis, blueprints, materiala an ttings. Com tete workin plang &"> Liner and Cllpper Coaches. Order TODAY $1.00. C. O. D. $1.12, THoTwooo. TRAILERS, ies be bam: Ranio’s biggest opportunities are still ahead. In a decade it has become a giant industry. The oppor- tunities created will be enjoyed by trained men. The International Correspondence Schools Radio Course, prepared by leading authorities and con- stantly revised, will make you a trained man! A fascinating book — free. INTERNATIONAL CORRESPONDENCE SCHOOLS. Box 2322-W, Scranton, Penna. Send me—free—information on subject checked: Radlo Service Man Electrical Engineer H Radio Radio Operator aus a Suspension Trailer for Boat ‘(Continued from page 105) modate a dory with 33” ends, a 25” free- board, and 72” beam; it has an “I” shaped axle, 3" deep and 78” wide, m orinar, 24” above the wheel hubs. Wheels 48” i diameter are used. This permits the dot? to ride about 15” above the ground. The. axle uprights, also of 3’ steel, are padded. to protect the boat gunnels, : The longitudinal beam is held true with, the axle by two sets of braces around 5’ in: length. From the elbows of the axle two pairs of 142” angle irons extend to the upper. surface of the beam. Approximately 11” in-: side the axle elbows two pairs of .2” strap’ irons reach to the under side of the beam. Bolts secure these sets of braces to the shaft and to each other. The mid point of the axle is fixed to the beam by. a bolt or ring bolt and an additional strap iron brace extend- ing both directions on the under side of the beam from the under surface of the axle. The. grooyed upper side of the axle is filled with wood in order to afford a flat surface for the beam rest. The shaft is 20 2” in length, and rests upon the axle at a point 11’ 9” from the hookup. A semi- -hardwood is suitable ma- terial, since the %” flexible steel cable as- sumes most of the stress. From a shackle fastened to the hookup iron the cable passes through a ring set at the apex of a triangular truss, which is approximately 18” above the shaft. At the rear extremity of the beam the cable is shackled to a steel band which is a part of the fixed hook. A turnbuckle pro- vides a means of obtaining the proper ten- sion, and cable clamps on either side of the apex ring prevent slippage, The front steel hook is fastened to a 1%” line in order that it may be moved handily along the beam to accommodate boats of varying lengths. Since the supporting shaft rides approximately 4’ above the ground, the hookup will have to drop in the neighbor- hood of 24” if it is to be coupled with an extension from the frame of the average auto- mobile. | Thrills With Infra-Red Photography (Continued from page 106) even those you cannot see with your eyes, show prominently. Green leaves and grass and other surfaces which reflect the infra- red rays of sunlight strongly are recorded as white. Red-sensitive negative material must be handled and developed in total darkness or: by the light of a green safelight designed for color-sensitive films and plates. Darkness always is to be preferred, at least until after development has progressed almost to com- pletion. Infra-red sensitive plates and films are de- veloped, fixed and washed like any other kind, no special developers or other chem- icals being necessary. Sag Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers.

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MAKE YOUR OWN PUA A Ed BE OUR REPRESENTATIVE EARN 45 $40 AWEEK. Here is work that will aid you to make your own prosperity. No} experience needed to act as our g- representative for Master Work Garments. Every business concern a prospect. Easy, pleasant work. You 4 receive pay daily in cash commis- sions. Advertising embroidered on f- garments is a big sales feature. You can-easily make up to $40 weekly. We supply everything needed to ; startimmediately. Write atonce forFREE complete selling outfit. GEO, MASTER GARMENT Co. 468 Ligonier, Indiana MENT, COMPLETE IN A NICE PORT- ico one yanes A NICOLETTI- ToAnySuit! Double the life of your f coat and vest with correctly matched pants. 100,000 patterns. | Every pair hand tailored to your measure. | Our match sent FREE for your O. K. before | pants are made. Fit guaranteed. Send piece of cloth or vest toda. SUPERIOR MATCH PANTS COMPANY 209 So. State St. Dept. 41 Chicago PROTECT YOUR Das PERSONAL TENT DERVICE TI offer a confidential service as your personal: representative in Washington on all patent prob- lems, trade-marks and copyrights. Prompt action assured, at a minimum of expense. Write me personally, today, for yaluable 72-page booklet and “Record of In- L. F. RANDOLPH vention’ form, free 527-D, Victor Building, Washington, D. C. casy For anyone., Jast prepare bed, piant our spawn, keep moist and ‘give short simple atten- tlon as OUR DIRECTIONS TELL HOW. Grow In cellar, basement, shed or unused space. Easily INEXPENSIVELY done. Raise large, SNOW Ww » meaty, delicious, REAL food value mushrooms. Begin with small bed, THEN EX- PAND--fill all space. with beda in tiers. 7 OVERNIGHT CROPS! Year around production. ASSURED MARKET. Fascinating, PROFITABLE ight Gime, or Pastime occupation. Splendid HOME. BUSINESS enterprise. Write today. INTERSTATE MUSHROOM INDUSTRIES, KW7357, Cottage Grove, Chicago Make Garden Pottery Without Molds Experience unnecessary. New, guaranteed machine makes more than 2,500 different designs of concrete bird baths, vases, jars, ete., without molds or costly tools. All colors. Use only sand and cement. Big profits—daity cash income. Two days out- put pays for it. Book and details 10c. NATIONAL POTTERIES COMPANY Room 3, 1115 Hawthorne Ave., Minmeapolis, Mino. Build the Famous “TORPEDO-CAR” Trailer Last. word in trailers, luxurious, Modern, streamlined, roomy, sleepy four, ship's galley, clothes closet, shower, toilet, bureau, refrigerator, tiled sink. Light and strong, easy P 9 to handle and. tòw. . Dozens of ex- tlusivé engineering and comfort features. Exceptionally easy to build from’. inexpensive materials. Building instructions, with original photos $1.00. Large working blueprints, material: lists, etc. $5.00 BYAM PRESS, 184 South St Androws, Los Angefes, California Thank You jor Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers NOW FIX ANY MAKE OF BOOKS 411 sHirrep FREE on approval; whether you want to qualify as garage owner, auto re- pair expert or merely wish to know how to keep your own car 100% efficient, look at these books—they are sent to- you tor free examina- tlon. 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 Take advantage of this offer now; send in the mine of valuable facts. , Coupon for FRE examination. You don’t pay us a penny, you don’t obligate yourself to pay anything unless you decide tolteep the boolts. dust tell us you want to see them and the full set of 6 great vol- umes, just off the press, will be sent to you! Read them, look them 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— wiring diagrams, construction details, service problems—are all right Aviation Motors Knee Action Wheels Rear Engine Cars Outboard Motors 3 Octane Selectors Tractors All Fully Covered LR. Sw 20 ua raat -up to the minute. Nowhere else can you get as complete and up-to-date information. Over a millon dollara of resources bave enabled us to give you the mast 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- ` pedlas (est. 1897) with agencies aJl over the world. Can You Fix It? Can you take out ‘‘play’’ in differ- ential? Can you kill the ‘‘shimmy”’ in steering? Can you reset TIM- ING? Can you put your finger on engine: trouble without guessing or tinkering? Can you pul] the starter ‘off and fix it? Can you adjust and repair transmission, engine, rear axle, bearings? These Books Tell How ond 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 specia) advertising price, $24.80, is paid. : A Year's Consulting Membership FREE ! Privilege of consulting engineers of milllon-dollar American Techni- eal Soviety on any automotive problem for one year without charge. If you mail coupon immediately we will include, free, extra rolume 7 with complete information on 1934 cars, knee action wheels, ete. SEND NO MON b American Technical Society, Dept. A-5320 a a Drexel Ave. at 58th St., Chicago, Ilinois. e Iwoul.] like to see the brand new.6-volume edition of your automo- E bile books but without any obligation to buy. I will pay the few cents delivery charges only and will'examine the books and return E them at. your expense in 10 days unless I like them, in whlch ease I will send you $2.90 then and only $3.00 per month until i B the special price nf only $24.80 is paid. You are to include free, emsulting membership certificate in the American Technical B- B Society. Send latest edition and also include volume 7 Free. B EName...... E ETE Gia op Wee aie. aara aaia ee ERS O38 B R SEE a cece ee EA A AANE a Aat B Geaa Aea A Ep A Sati co. eee edt a Employer’s Name. ... 2.0.0.0... ccc c ence cece erect eee eet ene B Employer's Address ......... 0. 0cc eee e cee eee teen eens i I The coupon must be filled out in full, If not employed B write us a letter explaining your work. - on me ses ees ee ss wae 125

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Your Tongue “PIPE-SHY”? Then meet the new Imported British BUTTNER ... the pipe for every man who thinks there isn’t any pipe he can enjoy! He can’t stand the “burned tongue”, the “break- ing in”, and the “bitter juice”! No pipe smoker ever really gets away from these deadly drawbacks—until he tries the new Imported British BUTTNER, that amaz- ingly dry, sweet, cool-smoking pipe. Just introduced in America, yet already thousands of men who thought they zould never smoke pipes ARE smoking BUTTNERS. And they’re telling us what an undreamed-of sensation in pipe- pleasure they're getting, The Buttner “Cooling System” Is the Reason BUTTNER uses the “radiator” principle that cools your éar. Every puff of smoke is drawn across more than 7 square inches of cooling, porous surface. This absorbent ceramic filter which surrounds the inner bowl (see X-ray below) sucks in all the heat, moisture and unhealthy toxins. Only cool, dry, sweet- tasting smoke enters your mouth. Nothing to irritate or harm tongue, throat and lungs. Here’s Why BUTTNER Smokes COOL and DRY Forever When the filter gets brown and stained, a minute in a gas flame burns out all. nicotine and other harmful substances and mekes it snow-white and ab- sorbent again. Now you know why the BUTTNER gives you the coolest, sweetest, driest, healthiest smoke you ever enjoyed. Sweet from the first puff; no breaking in. SEND NO MONEY. Try a Week at OUR Risk Simply pay the postman $2.50 (plus a few cents postage). Smoke the BUTTNER for a week steady. See how it stays cool, sweet, ary. If you are not delighted—more than satisfied—Just say so, return the pipe, and your money will be promptly refunded. =- MAIL THIS COUPON TODAY —~————— Buttner Pipe Corporation of America, 420 Lexington Ave., New York, N. Y. MM Please send me .......... Buttner Pipes together with 2 free extra how many filters as per your introductory offer. I will pay the postman $2.50 {cach) plus a few cents postage. (If you wish to send money in advance it will save you postage charges and. of course, our guarantee holds gcod.) NOM - oc ccc cnc c cane saa cee s odes rete eeesenr ea naeseeeetesenes sense AUAU cise cctianereiavennenomeny rete neseee rene nner n anne sees Dealers—write for trade price list. Restricted territory open for Distributors. 126 Whats Wrong With U: S. Navy? (Continued from page 72) zation program” has since been carried out. Blister hulls were constructed aroùnd some of the old armor belts to provide:old ships with effective protection against mines and torpedoes. Topside decks have ‘been ar- mored and strengthened against aircraft bombs, and steel “hats” were fitted over the smoke-stacks to keep enemy aviators from dropping their pineapples into the engine rooms. Airplanes and catapults have been installed. Various gunnery improvements were made, including anti-aircraft batteries and machine gun nests for discouraging aerial attack. Provision, of course, had to be made against the probability of gas attack from the air. No 1934 American Battleships - They look like 1934 models but they are far from it. The cold fact is that a 1934 bat- tleship is not to be had short of building one from the keel up. There will be no 1934 American battleships, however, because the Washington Treaty says we can’t build them until 1937. Now let us have a look at what happened ‘after Uncle Sam surrendered his life insur- ance and flung the cash on the Washington and London poker tables. England went through the gesture of scrapping 448,000 tons of naval ships, but what she scrapped was a lot of old packets that were about ready for the break-up yards. Japan junked 193,000 tons upon which con- struction had scarcely begun. France and Italy tore up some blueprints. Having scuttled most of the naval power we had, Uncle Sam sat back and considered the job all done! We did almost no naval building through the administrations. of Presidents Harding, Coolidge, and Hoover. Japan Increasing Naval Power Meanwhile Japan has laid down or appro- priated for 164 new vessels totalling 410,000 tons. England has laid down or appropriat- ed for 148 ships, including two fine battle- ships, a total of 470,000 tons. Japan has steadily built up her fleet until she is now only a few tons under the treaty limits. Eng- land has built, or is building, so she will have a navy of approximate treaty strength by 1936. No other leading nation has shown the slightest inclination to follow our disarma- ment example. : With the start of President Roosevelt’s administration, the navy found a new lease upon life. Warships are being built at a greater pace than ever before in peace time. In all 212,000 tons of new naval! craft are being laid down. The navy will have 58 new ships that will bring it up to full treaty strength. Through 1935 $442,000,000 will be spent to carry out the naval program. As this is being written congress is con- sidering an additional 102 new ships at a cost of at least $380,000,000 to replace present ships when their age of usefulness is passed. When this program is carried out the navy will rank second to none. ae Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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STHMA BRONCHIAL PAROXYSMS SUFFERING Aoi pe oan OVERCOME. phi so Vaa BEFORE. AFT Cal. “Tried everything ER without relicf. After us» ing 1% bottles of Ama- Gon I feel like a new per- son. Got ridof my wheez- ing and. sleep soundly now.”’” Ama-Gon, new, ee successful California - home treatment quickly Sleeps soundly NOW! overcomes suffering caused by ASTHMA, BRONCHIAL, HAY FEVER paroxysms. Ama-Gon quickly ends those awful suffo- cating, wheezing, choking sensations and enables you to breathe FREELY, EASILY and slecp soundly all night: SAFE for young or old. GUARANTEED FREE from dangerous ħabit-forming drugs. No matter how long you have suffered, the discoverer. of Ama-Gon wants you to use his successful home treatment a FULL 8 DAYS and prove its value to yourself WITHOUT RISKING ‘ONE CENT. MAIL COUPON NOW! ACCEPT. 8-DAY TRIAL OFFER! I AMA-GON LABORATORIES, REE | | Dept. C-29, 1500 N. Vermont, l Les Angeles, California. BOOK | | Rushmeyour 8-DAY TRIAL OFFER and FREE Book about Asthma, Brenchial, Hay Fever parox- | } ysms, WITHOUT COST OR OBLIGATION. l ] Name .... Address J l City .... J SECRETS of Beautiful Dancing lil REVEAL E for the first time by i. w- this remarkable new scientific method—the Danceograph. Make your dancing magnetic, fascinat- ing, alluring, glamorous, PROFES- SIONAL. Learn what it means to really dance. Send only $1.98 for com- plete course—10 easy lessons. 5 day trial. Money back if not satisfied. Mark X for course desired. O Ballroom [] Tango [] Tap and Clog DANCEOGRAPH DANCE ART, Inc. San Francisco, Calif. Invention SAVES GAS ! CUTS eates New Mileage Records It’s Here! VACU-MATIC—“‘ The Carburetor 555 Sutter St. ANU Mia leat Breathes!”"” AUTOMATIC CONTROL guarantees constant peak performance. More CcOoSsTS awer, smoother tunning, quicker starting. ts alf cars; installed In a few minutes. n't walt! Just send name and ad: i 30% TRIAL eroe eect VACU MATO and our FREE TRIAL OFFER. OFFER Write Todayi AGENTS WANTED VACU-MATIC CO. 7617-30 W. State St., Wauwatosa, Wis. PLAY A TUNE In 10 Minutes On your Spanish Guitar, Uke, Tenor Banjo, Mandolin or Banjo Mandolin. No knowledge of music necessary. No % -practice. Play first by number, then by note. Simply attach B-Z Player to your favorite instrument — press num- bered keys and play. instruction book with numbered tunes and chords comes with every E-Z Player. Start playing whe popular tunes by number right x oy off the reel, Be the life of the Moe ? party—the center of attraction—a oe fa tadio star. Don't wait. Write today s tf Us for 7-Day Free Trial Offer and Spe- cial Guitar Values. A postcard will do. ; FERRY SPECIALTIES, INC. Dept. 265 Evanston, Ill. The New Opportunity in Accounting —and how you can take advantage of it Never before, has there been as great an oppor- tunity as now faces efficient bookkeepers and accountants. And here’s why: In the first place, every firm will watch its accounting as never before. This depression has taught executives the vital necessity of know- ing all the facts about their business, where their company stands all the time. Then our new governmental policy — con- trolled economy—forces the keeping of better and more complete records in every office and plant. It willnot bea matter of choice with any hrm—it will be necessity. For instance—the National Industrial Re- covery Act—with regulation of production, minimum wages, uniform prices, codes of prac- tices—centers around cost control and uniform accounting within each industry. The new Federal Securities Act with its in- sistence upon publicity-of complete facts about every company selling its securities publicly will compel more frequent and more accurate financial statements—and these in turn call for more and better accounting. Ask About It And as business gains momentum, there will be a greater demand for trained beokkeepers and accountants—they will go back to work sooner and in larger proportion than any other group—in fact, accountants tell us the demand will probably soon exceed the supply. This spells real opportunity—for the man already in accounting, and for the capable man who wil! start training immediately. What are you going to do about it? Are you going to sit back and let the other fellow beat you out? Or are you going to be one of the first to take advantage of this opportunity—to go back to work or to win promotion and Jarger income, to profit and advance by the big changes? = The answer is up to you. But the man who is wise will at least investigate promptly—he will fill out and mail the coupon below. It will bring full information without obligation. SR RR SR SERS NEES SES SS eee LaSalle Extension University The Institution that has trained over 1,200 C.P.A’s Dept. 5493-HR Chicago Kindly tell me more about the present opportunities in accounting and how your training can help me grasp them. Also send me—free—your booklet on paccountancy, the Profession That ays. O Higher Accountancy Other LaSalle Opportunities: IF more interested in one of the fields indicated below, check and mail now. OBusiness Management OExpert Bookkeeping OU Modern Salesmanship OC. P. A. Coaching OTraffic Management O Business Correspon. ULaw—Degree of LL. B. OBusiness English g Practice Accounting ‘and Onne Management Nets. 2s cee es ueeek oiwiteuSaddessscecseceecessees. Present Position__---.------~------«-+---------- ene Address ._. 222. - ne ne ee ene nen ne nnn nnn ee neces - Thank You for Mentioning Modern. Mechaniz and Inventions for May When Writirig to Advertisers

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Ca f oo aael P aaa A UOM nan nE re [lit ao-} a ee ee ee — —_ os CE- -rE J-E] rs CE- Ito ENO E i opo e Cj ZEZ] CECO CoE = i est. — et | —_— oai Cy Ct = -a C kn Lal eas Eí BOOKS SENT FREE! N APPROVAL o 5 VOLUMES BRAND NEW EDITION 7. Only 15 minutesa day with these WONDER BOOKS will prepare you for a good drafting job in less than a year. Mechanical and architectural drafting from simple straight lines to important complex plans. A sep at atime! Bullt especially for beginners, for men with only grammar schooling. ing ‘room practice, PLUS ENGINEER- ING, made easy and clear. Includes com- plete course In blue-print reading. Big Field Big Demand Big Pay Competent draftamen are urgently needed right now in all building and manufacturing lines at $50.00 to $100.00 a week. That's just the beginning—FOR DRAFTSMEN HAVE THE BEST CHANCES FOR you for a good draft- ADVANCEMENT. Plossant, | fascinating | work, 7 ;. ` + AT BI a. BTN Quic) wi ing job JD mechanical Send coupon for a set FREE and seo for yoursalf. or architectural lines. A wear'a consulting, membership in r a ii i i Row giten ee Sent for 10 days’ free „elj ;o "al readers of ihia famous cyclopedia of [Be use if you mail coupon more drafting. it 4 immediately. For Beginners Written, so you can understand every word, by 22 famous engineers and archi- tects. DeLuxe flex- ible binding, nearly 2,000pages, 1546 blue- rints, charts. and iagrams; prepares Many say that st ta worth in the coat 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 cnse. Real $10 value, but free to you with these booka. AMERICAN TECHNICAL SOCIETY Dept. D-5320, Drexel at 58th St., Chleago, III. — ee ee ee ee re ee ee ee ee ee American Technical Society, Dept. D-5320, Drexel at. 58th St., Chicago, Ml. Send for 10 days’ free use New 6 volume eet of drafting. I will pay the few cents delivery charges. If] wish, I may return books in10 days and owe you nothing but If I decide to keep them, I will send $2.00 after 10 days, then only $3.00 a month until $19.80, the special introductory price, ia paid. Send lateat edition and inclade drawing instruments. ARREA o aat hi iia SEEEN RE ASERRE ATASA, ES n AASER Opre WESELE : Attach letter stating age, occupation, employer's name and address and that of at least one business man as @ reference. RAISE TWO-POUND BULLFROGS! Start anywhere. No food to buy! Breeder lays 10,000 eggs. Bullfrogs sell $2.00—$5.00 dozen. Sea- son just starting, FREE illustrated book, ‘Fortune in Frogs,” explains everything. Write today. AMERICAN FROG CANNING CO. Dept. 119 New Orleans, La. oda 128 Draft- - Big Profits in Frog Raising. (Continued from page 87) eggs each season; usually over seventy per cent hatch and develop into small frogs. The advantage of frog farming is the fact that you can start practically anywhere and expand gradually as your profits mount. A vacant city lot, an old orchard or even a back yard can be utilized. Due to the canni- balistic nature of adult frogs, the frog farmer needs three separate ponds, segregating the breeders, tadpoles, and small frogs. I have found a pond, 20x20 feet, water area, with bank space of six feet on all sides, to be capable of keeping six pairs of breeders. The water depth should not exceed 18 inches except for a pit in the center of the pond where the frogs hibernate in the winter time. Confine With Poultry Wire Ordinary one-inch mesh poultry wire four feet high with burlap sewed on the inside to prevent injury and to confine the smaller frogs, is the most sensible fence a frog farmer’ can use both for breeders and small frogs. Frogs breed from April until August. At this time, the frog farmer must have a small pond about 10x15 feet planted with arrowheads, water moss and other aquatic plants, in readiness. The pond should be not less than three feet deep to take care of the thousands of tadpoles. The egg mass must be.immediately trans- ferred to the small pond, using a scoop to handle them. In five days, each cluster be- comes a wiggling, living mass of tadpoles. Tadpoles are scavengers, eating anything from table scraps to water moss. In six to eight months, the tadpole begins to develop legs and in a short time is a small frog. At this time, its diet changes from that of a scavenger to being satisfied only with a live or moving food. The growing pond for the offspring of six pairs should embrace about two acres, in- cluding shore line. Water in the two acre tract should cover not more than one-half of the entire area. Feeding the Frogs I have raised frogs on liver and other domestic meat but I found it impractical to consider this method of feeding on a large scale. Small bullfrogs can be supplied with an abundance of insects, especially flies, by simply concealing several fish heads in the vegetation along shore. Common crabs, found in most any ditch or stream, and good food for frogs, can be placed directly into the growing pond where they will re- produce in enormous quantities. When ready for marketing, the frogs are caught at night by blinding them with a search light. When the catcher gets a frog he puts it into a burlap sack with others. They are then put into small pens awaiting the dresser who grabs them by their rear legs and pierces the head with a nail by a downward stroke of the hand. The en- trails are removed and the frog is ready for shipment in barrels of cracked ice. ipe Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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500 POWER MICROSCOPE 4 A - New 500X Super-Power Brownscope The QUALITY microscope satisfying the demand for ultra-high power at low cost. Maxnification can be varied from 75X to 500M to suit the particular require- ments of the Amateur Microscopist. ALL refine- ments: Hack 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 adjustabié«rcmovable mirror, Substantially and precisely made. Compare this new Brownscope with.other. microscopes on the’ market. Money back in five days if not thoroughly satisfied. Comescomplete with preparedand plain slides, directions, slide eda SE tar prelsnen equipment. Only ROWNS Dept. K-16 46 Fitth Ave. Do wary tg 9T OP TOBACCO? Banish the craving for tobacco asg Riedel thousnndshave. Make yourseli free ‘and happy with Tobacco Redeemer. Not asubstitute, not habit forming. Write for free booklet telling of in- jurious effect of tobacco and depend- able, easy way torelievethe craving Many men have, FREE Newell Pharmacal Co. BOOK Dept. 40, St. Louis, Mo. d BEA TRICK CARTOONIST Anyone can learn easily at home. pleasure or profit, New York Surprise your frlends. COMPLETE ILLUSTRATED COURSE GIVING 2 00 FULL, DETAILED INSTRUCTIONS—ONLY.... a criticisms free, Don't miss this excellent cpportunity to become a Teal cartoonist. THIS SPECIAL OFFER LIMITED—WRITE TODAY A. CARROLL. STUDIOS P. O. Box 75 St. Johns Place Sta. Brooklyn, N. N. Y. COMBINATION JIG AND gg, BAND SAW All features, 9’’ wheels, 4’’ depth, table insert, rigid construction, positive alignment, 10’’x10’’ tliting table. Price of saw $9.45, set of aluminum guards, $1.50, jig-saw attachment $3: Blade 80’’ $1. Shipplng weight 42 lbs, Send postcard for catalog of complete power tool line at these amazingly low prices, and de- tails of trial offer and satisfaetion guarantee, or save time and send $1, Balance C. O. D. pine express, 6'° swing woodturn- ee ae. Shak eine Parte ages me cl 8 . MACHINE & TOOL €O., 200 Broadway, Dept. X.B., NewYork. SEND NO Free catalog shows MONEY! how to enjoy this 2000-mile. range. home.and car set tor . 30 DAYS FREE.. Gete police c galar RCA U} iicensed, Retail value $25. YEAR GUAR- ANTEE. Also ALL- WAVE modell Write. today. (Agent samples tree.) GOLDENTONE RADIO MFG. CO. Dept.5,4186 Oakman BNd., Detroit, Mich. Make Money at Hom GROW our famous Fancy White ae a Queen. Mushrooms. Experience n- SP PIE necessary—we tell you how, Big de Saas mand, at highest prices. Marketing facilities furnished. Wustrat- ed book free. Write today! AMERICAN N MUSHROOM 56S Woolnough Bidg., Toronto, Ont. Create original cartoons for Soe z 2 3 3 KE MONEY Right Away! Your Own Business ATHOME SPARE. TIME: TIME: Up to _ $3. 3.00, $4.00 or even; FULL TIM 35 to $50 æ week poesible, Others haye made more. Amazing New un less” D hnui Greaseless” Doughnut The Business that FED HUNDREDS of Families all through the Depression, now booming and =A BIG SMASH HIT! L. N. paid off mortgage on house, bought new car and made 4 living on one machine. J. B. started with one, now sells cnilre output fifteen machines going 10-11 hours per day. M. W. fed family of eleven from one machine. Hundreds men and women both husband and wife working together bought every morsel focd, paid rent and kept going through worst ` of depression Kn mi astounding ma- chine. Now, with things picking up, reports are better than ever. READ These dough- nuts have swept the MONEY AT ONCE country and Takes no ‘‘long haul’’ building process. Simply get Free Plans, install one ma- chine in kitchen or spare room and you taken the Na- tional Appe- tite by storm. can make money right fram the first day. Many have borrowed small amount necessary to start and paid it back in first week. Cash in pockets every day. Profits back at once. This is positively the most phenomenal home business suc- cess we knew of. Stores handle your prod- uct. Restaurants seJl dozens. Everyone pager to uy it because. it is pe, ar Dou gh nut erent, ‘“‘Greaseless.’"" No delays. No z 2 learning or costly mistakes. Just a market $96, 000,000 annu- ally. Growing fast. Full Plans FREE | Send Coupon quick, sure steady income right away for those who are willing to work. COSTS NOTHING to get full facts. One postage stamp is all you risk, Send name and address on coupon below. We send complete plans showing how to start your money making business on small investment and few dollars for materials. Don't waste a min- ute. in finding out how. you can make money in a business that many have called a “blessing.” F. D.. M. CORP., Dept, 465, 500 N. Dearborn. St. Chicago, TI. F. D. M. CORP.. Dept. 465, 1 500. N. Dearborn: St., Chicago, I. I Send Freé. and’ without obligation ccmplete Plan for starting Money Making Business at home that will pay profits at once. | Adre 3. overt isbb Hee AWe baaws gare OAR eee re | A ie yi ari: iNew eas) d. ing ome likeit. Send RRORTUNI TIE MODERN: PHoToc! Sennan panic Ma Aag Cit State | MERICAN: feularas. oF PHOTOGRAPHY. GILF ww ce eee eee teens Tale... eee ee | Dept. 2055 360i Michigan Avenuo Chicogo, U. S- A — m æ a m Á Á X o X- — Á M eee ngee Thank You for Mentioning Modern Mechanix and Ingentions forMay. W ken Writing to Advertisers

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TG Firestone ACoodrich Pye INEW-LOW PRICESI SGOOD/YEAR San OTHERS gy U ae = LOWEST. PRICES onEART! y.% TIRE USERS by thousands alloverthe U.S.A. vouch g for LONG, HARD SERVICE, under severest road conditions of our standard brand Tlresreconstructed by the ORIGINAL SECRET YORK PROCESS. OUR 18 YEARS In business makes it possible to offer tires at LOWEST PRICES in history with 12 9) month guarantes.—Don’t Delay—Order Today Mf sue BALLOON TIRES res ‘tubes e m re H] 29x4.40-21 $2.18 80.85| 30x5.25-20 $2.95 L13 29x4.50-20 2.35 0.85f31x5.25-21 3.25 L15 fy 20x4.50-21 2.40 0.85|28x5.50-I§ 3:35 115 28x4.75-19 2.45 0.95] 29x5.50-19 3:35 115 ey 29x4.75-20 2.50 0.95 |30x6.00-18 3.40 115 AG 29x5.00-19 2.85 1.05ļ31xz6.00-19 340 1.15 Mem 30x5.00-20 2.68 1.05 | 32x6.00-20 345 1.25 28x5.25-18 2.90 1:15] 33x6.00-21 3:65 125 S 29x5.25-19 2.95 1.15132x6.50-20 3.75 1.35 REGULAR CORD TIRES | Size Tires Tubes | Size Tires Tubes 30x3 $2.25 $0.65]32x44 $3.35 1.15 VA 30x34 ("2:95 0.75433x454 “3AB 112 31x4 2.95 0.85734x434 345 115 E 32x4 2.95 0.85 | 30x5 3.65 1.35 33x4 2.95 0.85 | 33x5 3:75 145. O 34x 3.25 0.85 |] 35x5 3.95 1.55 HEAVY DUTY TRUCK TIRE Tires Tubes 25 $1.9 Sr Sai. Truo ese 2 XI ply. Truck 6.95 2.7. 32x6 10 ply. Truck 7.95 378 36x6 Truck 98.95 3.95 34x7 Truck 9.95 3.25 36x8 Truck 11.45 3.95 40x8 Truck 13.25 _ 4.15. SEND ONLY $1.00 DEPOSIT with each tire ordered, ($4.00 deposit on each Truck ire.) y 2 chip balance $ »O.D, Deduc' per cen i (OILLL contin full with order ALL TURES RUMI failinete give 12 month’ sorvicn ce: DOONAU placed athalf price. Tee Fe Heereeuteyt al [eR STEN ESD y kdr CCA YORKTIRE &RUBBERCO. 4849-59 Cottage Grove Ave. Dept. 4009, Chicago Over 3,500 athletes now ‘in pictures! Physical Cul- ture training won-me a =| ‘movie contract. Studios = search constantly for men & =] with well-developed bodies, "d Loffer youachance to wina FREE TRIP TO HOLLYWOOD Ø and Free Screen and Talkie Test through my home- 24 study Physical Culture Course. What this training has done for me and many other picture stars it can i do for YOU too. Send NOW for. my FREE booklet. 5 Give_ name, age and address for full particulars. aS Joe Bonomo, 204-J Bonomo Bldg., Hollywood, Calif, Send for FREE COPY of Modern Mechanix Blueprint Booklet ood 130 Light Tents for the Outdoor Camper (Continued from page 95) favorite light tent. It is merely a typical wall tent with one, of its walls and part of its inside eliminated, the half of the roof then being raised on crotched poles in front as shown in the illustration. In many ways the Dan Beard pattern of tent is an ideal shelter, its only fault being that.it requires so many poles, guy ropes, pegs and fixings in-general. Can Be Made Any Size The drawing showing a rear view of the Canoe Tent will at once give the reader an idea of the design and cut of this tent. It can be made any size that is desired. Fol- lowing the lines of this drawing, and permit- ting the lines to stand for cords or strings, one can easily string out the design of this Canoe Tent, practically as shown in the drawing. In fact the lines of any shelter tent mentioned can be lined out with strings. In outlining the Canoe Tent first tie a cord to the ceiling, rafter, or limb of tree. Draw this tight and fix to floor or ground. The tent being five feet high in front, make ‘a mark at that point. Runa cord down to the floor from either side of this mark to give you the front slope. Now line out the back which is four feet wide and two feet high, using some rod or stick to tie the strings to in lieu of the crosspiece on the crotches as used when the tent is erected out-of-doors. Thus proceeding from one angle to another the tent may be lined out and the total amount of canvas needed can readily be estimated, average canvas strips being 28 inches wide, which, allowing for over-lapping at seams, makes the width in between the seams, when sewed into the tent, 26 inches. Making the Lincoln Tent The writer fashioned a tent some years ago which is not only quite commodious, but has a number of other advantages. This tent stands five feet high, peak to ground, a length, floor measurement, of seven feet, and a width of six feet. To line this model out with your cords, attach the ridge arrangement (A in the illustration) to some object above, and let it hang down to within five feet of the floor. There is your height. Now let a cord down from the back to the floor, and one from front to the floor, space seven feet apart. Now put a cord down to the points B and C, and to like points on the other side, spacing the cords (as between the two sides) a dis- tance of six feet for the width. The section of canvas that contains the bobbinet is spaced centrally. Thus 13 inches to either side of the central mark D affix a tack in the floor and run a cord up from each tack to the peak. Do the same in the back, spacing the same. The space as be- tween C and F must now be accounted for, it being necessary to fill in with a piece of canvas G which would otherwise be a waste piece from the piece H. There are four such sections to be arranged, one on either side of the bobbinetted section, and one on either side of the central section in back that cer- responds with the like section as in front. ne» Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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Better Built Lower Prices Only Boats With Full Length Spray Rails Keep passengers perfectly Rowboats $36 and up i ape dry—even at high speeds. Catalog also shows snipe sail boat complete with sail for $165. To big, factories. Prompt shipment, R CATALOG FREE Y a 4 dof -aga e e i. tate kinaa. Motor Boats $395 and up . BOAT MFG. CO., 6? 220 LHOMPSON BROS. I 130 Eim St., PESHTIGO. Wis. either place Learn WATCH REPAIRING AT HOME You can learn by our modern and original system of instruction every part of the Watch Repairing Trade at home as good or better than ata shop. You can earn money while learning and secure a well paying position or start in business after completing our course of instruction. Good watch repairers are always in demand and earn very good salaries. For particulars apply to the MILWAUKEE SCHOOL OF WATCH REPAIRING $24 E. MASON ST., Dept. © MILWAUKEE, WIS. QUIT TOBACCO Tobacco may injure your health, weaken your glands, make you look older and feel older, and handicap social or financial success, If you want help in quitting tobacco, write John Malick, 903 Coates House, Kansas City, Mo., for freeinformation and instructions for a simple home method which many say quickly aided them to leave off from smoking, chewing, or using snuff. No habit-forming drugs or narcotics to take. Harmless to use. Reliable over 15 years. Write him today. No obligation. 20X MARINE SPY-GLASS a $4 .95 Postpaid No. 306—All metal; black stipple enamel; 1 draw (nickel) closed 14°’; ext. 16°" tube 14''; objective 1‘; full 20 power. Well made, nicely finished —$1.95 ppd. No. 906—-felescope; 10 power; 6 sections; over] ft. long; fibre; leatherette body; black metal mtngs. $1.25 ppd. NEW Catalog Ms3—Micros and Telescopes $1 to $85; Binoculars, Air Pistols, Firearms, etc. Send stamp. M. LEE SALES Co. 35 West 32nd St. New York HAENEL “100 SHOT”? REPEATER $ 425 Latest Model 1934 Haenel repeating plstol. Sturdy, massive construction, easy cocking lever, 100 shot magazine, For target. Powerful for small game, Blue or Nickel finish, shoots B.B. steel shot. Welght 18 oz. Free—500 shots, 10 targets, leather holster—$2.00 deposit on C.O.D. Free Catalog—Colts,S.@W. Rifles, Binoculars, etc. HUDSON SPORTING GOODS COMPANY ™M1-52 Warren Street ENE Outboards $36 and up COE" a 12and 15in. Flying Your Choice of 12 Different Models Any 2 for 50c PLUS 1€¢ POSTAGE Send a Slamp tor New BULLETIN of Full fuselage Models, guaranteed to fly. Each complete in Construction Kit with all parts, materials and Plans—Instructions. Curtiss Hetl Diver Spad Biplane Puss Moth Monocoupo Sparrow Hawk Polish Fighter _ z Fokker D-8 Fokker Triplane Boeing Fighter Latest Airplane and Sopwith Camel Heath Parasol British S. E. 5 Boat Models. IDEAL AEROPLANE & SUPPLY COMPANY, Inc. 26-28 West 19th Street New York, N. Y. seci Thank You for Mentioning Modern Mechanix and Inventions for May Fhen Writing to Advertisers BECOME AUTO & DIESEL EXPERT Train for Good Jobs Jobs are again becoming avallable—but the trained men are getting them. Enroll at National and quickly learn AUTO REPAIR and ser- vielng. You can qualify for general repair expert, ignition expert, battery specialist, engine overhauling and al] other profitable branches. Diesel Engine Course being added. Enroll before present low tultion fee is advanced. Comptete Practical Auto Instructlon. You learn by actual shop practice method in largest trade school in West. Est. 29 yrs. ago. 30,000 graduates. Diesel course being added, ROOM AND BOARD WHILE LEARNING If you are short of money, enroll anyway. 76 per cent of our students are earning room and board. We'll help you secure part-time job. Coach railroad fare allowed to Los Angeles, SEND FOR NEW BOOK OF DETAILS Profusely illuatrated Book, telling all about course, new equipment, Los Angeles scenes and picture story of auto tralning FREE. Send coupon. NATIONAL AUTOMOTIVE SCHOOL POLST U Dept. MMA-5, 4008 South Fi St, Send Free Anto Book und Special oer! DO YOU WANT A JOB? 19384 is the year for you to get a good job National trains you for the Big Opportunities Name.... Address . City -.- Steiner Electric Lawn Mower Mows quicker, better, and easier. 16’, $45.00, Gasoline Mowers, 18’, $89.50, and Hand Mow- ers, all steel, unbreakable, finest quali- ty, 16’, $12.70. Write for circular “ML.” Steiner Products Corp., Mfgrs. St. Louis, Mo., U. S. A. 5751 Easton Ave. F, E. Kino was “a poorly paid clerk” when he enrolled for the home-study Drafting Course of the International School of Drafting. Through study and perseverance he became Chief Draftsman of the U.S. Steel Furniture Co. He is now earning more in a day than he used to earn in a week. A. J. Hutchins became Chief Draftsman for the American Strawboard Company and incréased his salary 300% — also as a result of our training. There is no doubt that Drafting offers a real opportunity to ambitious men and it will pay you to investigate it. Mail coupon ‘for free booklet. INTERNATIONAL SCHOOL OF . DRAFTING. Division of the International Correspondence Schools é Box 2321-W, Scranton, Penna. Without cost or obligation, please send me full details of your home-study course in O Mechanical Drafting O Structural Drafting O Architectural Draltiog [) Ship Drafting

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(Genuine) ne Men) Clow 72 bee (Refinished) ) Fully Famous Guaranteed Miodel No. 5 ane Yours for 10 Days NOW 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, Seethe neat, perfect work it does—com- pare its bright, shiny newness without risk. Easy 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 Brice and’ eastest terms. All complete with modern improvements - including standard 4-rew keyboard, Leam Touch Typewriting Dack spacer, automatie ribbon reverse, shift lock, 2-color Tibbon, ete. Ideal for business and professional men— teachers, students, story writers, etc. Don’t Jet this chance pass by. MONEY-BACK GUARANTEE You save over $60 by quick action. These genuine guaranteed Under- woods now only $39.90 (cash) while limited supply lasts. Send no money! The Underwood is yours for 10 days’ trial, If you keep it—only 10c àa day soon pays for your Underwood on our new low price and easlest terms. Send at once before this special offer is with- drawn. Remember every machine fully guarantced and sent on 10 day trial. Learn touch typewriting freel Complete (home “study) course of famous Van Sant System given with this offer. ulty illustrated—easily Jearned. DDERSRITURCRTATNUAS POR ETON URAEOT TEU IUORSRERSREGREOSODCRESTONERR International Typewriter Exchange 231 W. Monroe St., Chicago, Dept. 505 Kend Underwood No. 5 (F. O. RB. Chicago) at once for 10 day trial, If I am not perfectly satisfted I can return it express collect. If I keep it I will pay $3.00 a month until I have paid $44.90 (term price) in full. Address .. Town .. Reference UBBDCESCCRDED -oii 132 Recognized as the finest, strongest typewriter built. Will Washington Monument Crash? (Continued from page 33) George P. Merrill of the U. S. National Museum who pointed out that there are three grades of marble in the monument, but only one, in his judgment, was of the highest type. At the outset of the federal test program it was suspected that poor distribution of weight was a major cause of the widespread chipping away of the lower section of marble. It was decided to make a series of unique tests to determine whether this sus- picion was indeed correct. First of all en- gineers, equipped with rock-boring instru- ments of unusual sharpness, bored tiny holes, about an inch in diameter, deep into the “granite rubble.” Next, they placed pipes ‘into the holes, sealed the pipes tightly with mortar and forced compressed air into them. Close observation showed that this air would blow out at numerous places. This offered conclusive proof that there were many hollow places in the masonry. Having found out the main cause of the monument’s deterioration, engineers called upon D, W. Kessler, building stone special- ist of the Bureau of Standards, for advice. Science Applies Pressure Test As his test materials the scientist selected 16 marble cubes, 8 inches square, each weighing about 50 pounds, made of the same kind of stone as the monument and weathered to about the same degree. Next Mr. Kessler cemented two of these blocks together with a thin layer of mor- tar, in substantially the same way as the monument blocks are welded. He then placed the experimental cubes in a giant machine with a 10,000,000-pound capacity. Since this was primarily a weight re- distribution test, the scientist previously had cut back the joints on the blocks 1% inches and refilled these cut-back joints with a more elastic mortar than that used in cementing the monument together. The test was a success! Under pressure conditions similar to those found in the monument the test blocks stood far more than the necessary strain without splitting. In his next test Mr. Kessler cut back the joints of the experimental blocks to a lesser depth—1% inches—to find the minimum depth the joints could be cut back and still not crack or split under the tremendous pressure exerted upon them. This test was also successful. Within the near future federal experts, it is understood, will apply Mr. Kessler’s new-found method of weight re-distribution to the monument itself. What they prob- ably will proceed to do, he explains, is to re-distribute the weight of the entire lower section of the monument — from the 150- foot mark to the ground level. When the work is completed virtual assurance will be given the nation that our greatest memo- rial will hold together for at least a couple of hundred years without major repairs. Igoe Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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6'SOLDER FREE Sensationalt Every man and boy will want a “RED HOT’ ELECTRIC SOLDERING IRON, Full. sized 11144’°—98% Hard Drawn T Henting Honde- ft, Wire and Bako- fee Ping eid Vo AC Pens Were quicker heating=long lasting.Solderfree! For radio, auto, and olectrica) repairs, Does the work | wiring,pots,kettles, blnges, ete. Saves of any $1.50 } many times its cost! Tear out thissd— © : r fs yours today at any hardwarestore. OY soldering iron | [f yoar denier m eoid out, send Sve plus & — or your Llc to cover packing and’ postage. money back. $O-LO WORKS, Dept. RHM Cincinnati Ohio 00 Power Microscope Substantial, American made, precise, fully adjustable micro- scope with powers ranging from 110 to 500X. 250,000 surface areas. Rack and pinion focusing adjustment. Microscope tilts any angle. Adjustable mirror slide clips. Helght, 12% inches. Incomparable value. Compare prices and quality and if not more than satisfied, i money will be cheerfully refunded. $6.25. With Complete Dissecting Set......$7.50. PAGO, Inc. “« Dept. 57, 1095-Sixth Ave., New York THROW AWAY YOUR SHAVING BRUSHES Buy no more expensive shaving creams and soaps, Get the smoothest and coolest shaves you ever had, at no expense. No mussy lather to get on your hands while shaving, and make the skin slippery. ‘Che secret of a clean, close shave is tostretch theskin. This cannot be done with Tather on the face, therefore my method of shaving is the secret of a perfect shave. Once let a man shave with my method and never again will he shave any other way. Why should he, when each year he is saving several times what my instructions cost him. I was a Barber over thirty years before I stumbled upon this clean, quick, smooth way of shaving. Personally I never shaved any other way since. Send $1.00 money order, your name and address plainly written, and receive full instructions. NU-WAY CO BOX 1045 RICHMOND, CALIF. MARVELOUS NEW LAMP CUTS ELECTRIC BILLS 100 Watt bulb gives 200 watt illumination. Guaranteed 1000 burning hours. Five sizes— 50 to 200 wate. BIG PROFIT FOR AGENTS 100 Watt lamp, reg. price $1.25, you sell for 85c. Costs you 45c. Send 25¢ for sample and money-making Sales plan, Dept. GE21, MASTERLITE CO., 110 E. 23rd St., N. Y. 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 À book catalog and monthly market bulletin showing prices we pay our breederssentfor only 10c. Address == OUTDOOR ENTERPRISE CO. ino. Box 403 NEW CITY, Rookland County, N. Y. LEARN TO DANCE LEARN THE LATEST LEAD AND FOLLOW BROADWAY ‘STEPS A T H o M E Correctly, Gracetully This new, simple method teaches you QUICKLY AND EASILY. 20 DIFFERENT STEPS FOR ALL MODERN DANCES. Tho modern FOX TROT. The dreamy WALTZ. LATEST a TANGO. The latest SOCIETY STEPS will make you HAPPIER, HEALTHIER, ‘MORE POPULAR. YOULL ENJOY DANCING. Money back if not satisfied after 10 days’ trlal. Don’t be a wall- flower. GET SOME ENJOYMENT OUT OF LIFE! Write for full parliculars, without obligation, to IRVING SCOLNICK, Thank You for Mentioning Modern Mechanix and Inventions for May Fhen Writing to Advertisers Will You Trust Wie? C. M. ELLIOTT, Secretary, Extension Work and Student Employment Service Let Me Show You How I Can Help You Get a Better Job and Make More Money In the 14 years I’ve been with this School, I’ve had the pleasure of HELPING MEN AND WOMEN of all ages solve their all-important problem of how to get better jobs and make more money. And HUNDREDS of them have thanked me for showing them the way to success. What Salary Do You Want? A JOB MEANS WORK—but what kind of work, depends on you. YOU SET YOUR OWN SALARY when you pick your job. If all you can do is lift and carry—use your hands and feet—you’ll have to be content with what that kind of work pays. To EARN REAL MONEY, you must be able to do work that every Tom, Dick, and Harry can’t do. Pll Help You Get a Good Job If you will trust me—TI’ll tell you just how you can get the BIG-PAY JOB YOU REALLY WANT. What’s even better, I’ll help you get it. Part of your spare time is all that’s necessary. Our selective EMPLOYMENT SERVICE will help you cash in on your training just as soon as you get it—no extra charge. Your request for my help will also bring you a list of THOUSANDS OF STUDENTS AND GRAD- UATES from all over the country, who have volun- teered to let us give them as local references. Any one of them will be glad to give you first-hand infor- mation about how we helped them, You will be surprised to learn how a little TRAINING WILL BOOST YOU out of “any old job” up to a good Position with a future. Dept. G-523 Mr. Elliott: Drexel Ave. at 58th St. Chieago I should be glad to have you explain how you will HELP ME GET A GOOD JOB in the line checked X below, Also send me list of your local student and graduate references 147 West 42nd St., New York! whom I may write, phone, or call upon if I so desire, No obligation. —Architecture & Building —Electrical Engineering —Automotive Engineering —Civil Enginoering —Business Management —Highway Engineering —~Higher Account'g (C.P.A.) —Complete Law ` —Salesmanshlp —Mechanical Englneering —Drafting & Design —High Schoot Course NAW. Giese cede eres anes eee ecee sean net Age........ AMOS. i ie Se eRe Cae Deed ARAR ENEN |e am SSS SS E ES) Nae.

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BOYS ?t? Own the snappiest boat afloat! ...the 20 Ib. nonsinkable MEAD “KI-YAK”! You can assemble it in 3 days from our complete cut-to-fit Kit, for only $15.75 F.O.B. Factory, 9-seater— $19.50. (Complete Sailing Rig a few dollars extra.) Are you going to “hang around” on shore i this Summer, or are you going to have the envy of hen all your friends by owning this eraceful, speedy, seaworthy craft? Rush 10c for new colored, illustrat- ed circular and Free $6 Paddle Offer! $6 PADDLE GIVEN A beautiful, 8-foot douhle-blade Paddle H| now given with your Kt-Yak—if you R| hurry? 12 S. MARKET STREET} Dept. M-5, CHICAGO SORTAS AITITA MEAD GLIDERS Is it necessary to suffer from these skin disorders? New wonderful ointment now relieving many stub- born eases. Try it no matter how long afflicted. Write EDWARD KLOWDEN, Room (08, 519 N. Central Park CHICAGO, ILL. HIGH POWERED TELESCOPE 51.98 Genuine Brownscopes at Amazing Prices. Most power- g Jul in America for the money ! 15 power long range pe Special telescope. Can see moon’s cratersortimeon Super Power pocket watcha block away. 5 sections. Ap- # 30X Telescope. prox. 3 ft. long. Fine lenses. Brass Stmllar toabore but bound. Can be used as power- ful microscope vol, magn. 512X. Only _ $1.69 postpaid! C.O.D. “ag extra. ei $1.69 mere powerful, guaran- teed to see 900 times larger in surface and 30 times closer. 31mm objective. 4 powerful lenses. Large field. Includes powerful micro- “scope feature. Only $1.93 postpaid, BROWNSCOPE CO., Dept.X-15,246 Fifth Ave.,N.¥. ASTHMA SUFFERING OVERCOME— (Quickly, Safely! Ama-Gon, amazing new California home treatment, quickly stops Asthma, | Bronchitis, Hay Fever suffering. Absolutely SAFE for young or old. No Ẹ matter how many remedies you have tried, Ama-Gon quickl that awful wheezing, choking sensation FREELY, EASILY again. MAIL COUPON NOW FOR [AMA-GON LABORATORIES, — BOOK] Name J Address «i; 134 and enables Promotes sound, restful sleep. to prove its value to YOURSELF WITHOUT RISKING ONE CENT ACCEPT 8-DAY TRIAL OFFER Í Dept. C28, 1500 N. Vermont, Los Angeles, Calif. Accept 8-DAY TRIAL OFFER, and FREE Book about REE Asthma, Bronchitis, Hay Fever, WITHOUT COST. {ROLE LoNes FOLDED 1i Combining 12 tools. Accurate, economi- cal. Made of Ger- man Silrer, also Brass. Weighs 3 ounces. Folded 6% inches long, Fully extended 1 foot. > CRAFTSMEN, ARCHITECTS, ENGINEERS, MANUAL TRAIN- ING SCHOOLS, MECHANICS and others need it. Distributors wanted. Send 50c for Sample Tool HUTCHISON MANUFACTURING COMPANY Nashville FOR CHEAPER TENNIS {%8 EARN REAL MONEY, TOO! New, amazingly simple device NOW enable: anyone to re-stnng tennie racquets at bi savings or for BIG PROFITS! Write today ior E detaila and Cavalog of tennis equipment. |. E. WILLS CO. 1047 W. 47th St., Dept.23-55 Chicago Bny real “FACTORY FRESH’’ GUT strings direct-from-factory-to- wo at LOW cost. Silk strings, too, MAKE MONEY CUOI , | l EARN steady income each week, working at home, | | coloring photos and miniatures in oil. Learn famous “Koehne 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 Trec booklet, “Make Money at Home.” NATIONAL ART SCHOOL, Inc. 3601 Michiaan Avenue, Dept. 2055, Chicago, Illinois The U.S. AIR CORPS Takes in this year 600 unmarried men between ages of 20 and 28 and gives them FREE FLYING a TRAINING consisting of 200 SOLO HOURS, including cross country and night flying. Gives them Special Uniforms, Travel- ing Expenses to Field, Living Expenses, and pays each man $73 a month. The course lakes one year. It costs Absolutely Nothing, Let us tell You: Hew to Get In; Information about System, Leave, and Actual Life at the New $10,000,000 Field. Send your Name. Hand postman $1 and postage when Information cames. It ls COMPLETE. Nothing else to buy. Flying Intelligence Bureau, 401 Jud N. Rives Bldg.,Los Angeles, Callfornia HAY BRONCHITIS BEFORE FEVER AFTER | y overcomes you to breathe We want YOU $ ; A Sleeps Soundly NOW! *Isuffered 15 yrs. with Bronchial Asthma,” wrote Mrs. R. Chavez, | 280 S. Palm St., Ventura, Calif., “Tried everything without relief. After using 114 bottles of Ama- Gon [feel like a new person. Got | rid of my wheezing and now sleep soundly the whole night thru.” Mos Thank You for Mentioning Modern Mechanix end Inventions for May When Writing to Advertisers

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Learn to Play Baseball From Stars (Continued from page 45) read of Eddie Rommel’s success with it.” Good screw ball pitchers are few and far between. Carl Hubbell of the New York Giants, hero of the 1933 World Series, is perhaps the most successful of this type today. He told me: “The screw ball is so called, of course, because it travels much in the manner of an ordinary screw being turned into wood. “It is held the same as in the case of the ordinary pitch and thrown side-arm with a very sharp twist of the wrist with the thumb falling outward at the instant of de- livery. This causes the ball to rotate from left to right as it moves in flight.” Probably the best example of a fast ball pitcher in all baseball was Walter Johnson. Most pitchers used the overhand swing, the ball shooting downward from the high- est point of the swing. Not so with Johnson, however. His slow, side-armed delivery was particularly deceptive. Batters were in- variably puzzled as to why a ball could be thrown so easily and yet so fast. The Famous Fadeaway The fadeway was Christy Mathewson’s best bet, delivered by a particularly stress- ing sweep of the arm, moving toward third base on the downward swing and toward first at its completion. Thrown much in the man- ner of the outcurve, it differs in that the palm of the hand is held downward, so that the ball slips away between the second and third fingers, Let us now turn to the batter. Rogers Hornsby stood in the rear and to the right of the box. He holds the highest modern batting average—.424 in 1924. Here is his explanation: “Of course I stood as I did because it was the most natural way for me to do so. How- ever, I found, at the same time, that by standing back and away from the plate with my feet almost together that I could have more time to study a pitch. “Also, by standing that way I could move my left foot either forward in the direction of the plate or directly toward the pitcher. In this manner I could better prepare my- self for any sort of a pitch without throw- ing myself off balance.” Ty Cobb needs no introduction as a hit-: ter. Cobb was the master. Recently I dis- cussed batting with him. He said: “I suppose I would never be called an orthodox hitter. But I found that by hold- ing the bat shorter than is customary and by keeping my hands apart until such time as I swung at. the ball, I could maintain bet- ter control of the bat and be ready to bunt or place-hit.” i No batting treatise is complete without mention of Babe Ruth, who takes his stance near the plate, feet almost together. Ruth holds fs bat long, for, as he says, “By hold- ing my bat long I find that I get more lever- age for my long drives.” ire) Spare Time Training that helps you Speed Up Prosperity! De YOU want to speed up the return of prosperity to you—insure your carly and large participation in the new jobs, promotions and salary increases— get fullest benefits from the business pick-up? You can do it. For many months to come, individual competition in business will be tremendous. Employers—up against new problems, fighting for survival and profits—will be able to pick and choose. Naturally they will prefer the trained man—the man who has special ability to offer them, If you wish this advantage, simply mark on the coupon the field of business in which you are most interested. We will send you full information about the opportunities in that field, tell you how our com- plete success-building program helps you plan your future, trains you in your spare time, and works with you all through your career, Send the coupon NOW. === = find Yourself Through LaSalle- = = = = = LaSallo Extension University Dept. 5493.R Chicago Please send me full information regarding the success-building training and service I have marked with an X below, Also a copy of “‘Ten Years’ Promotion in One'’—all without obliga- tion to me. O Business Management: Training for Of- ficial, Managerial, Sales and Departmental Executive positions. O Modern Salesmanship: Training for posi- tion as Sales Executive, Salesman, Sales Trainer, Sales Promotion Manager, Manu- facturer's Agent, and all positions in retail, wholesale or specialty selling. O Higher Accountancy: Training for posi- tion as Auditor, Comptroller, Certified Pub- lic Accountant, Cost Accountant, etc. QO Trafic Management: Training for posi- tion as Railroad or Industrial Traffic Man- ager, Rate Expert, Freight Solicitor, etc. O Law: LL. B. Degree. O Banking and Finance: Training for executive positions in Banks and Financial Institutions. 0 Modern Foremanship: Training for posi- tions in Shop Management, such as that of Superintendent, General Foreman, Fore- man, Sub-Foreman, etc. DO Industrial Management: Training for Works Management, Production Control, Industrial Engineering, etc. Personnel Management: Training for Personnel Manager, Industrial Relations Manager, Employment Manager, and posi- tions in Employee Service. Modern Business Correspondence: Training for Sales or Collection Correspon- dent, Sales Promotion Manager, Mail Sales Manager, Secretary, etc. Stenography: Training in the new superior machine shorthand, Stenotypy. Railway Station Management Railway Accounting Espert Bookkeeping Business English Commercial Law Credit and Collec- tion Correspondence Paper Salesman’s Training Public Speaking C. P. A. Coaching Commercial Spanish Office Management Food Store Manage- ment a a oooo00 O 00000 O O Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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Actually Put Photos On Cloth, Wood, Metal Print Favorite Snapshots or Por- traits on Handkerchiefs, Ties, Pillows, Scarfs, Table Covers, Lov- ing Cups, Dishes, Novelties, etc. LEROITYPE SENSITIZER newest product of photographic sci- ence gives perfect, rich black and white photo reproductions on cloth, metals, etc. Very simple to do. No equipment required. Full instructions with each bottle, Enough for 60 pictures. $1 postpaid. CENTRO CLOTHOGRAPH prints pictures on cloth only, in beautiful, clear brown tones. Satisfaction positively guaran- teed. One bottle makes 25 pictures. Postpaid for 45c with full instructions. MAKE INVISIBLE PHOTOS WITH. LEROIMYSTIC Loads of fun making invisible photos. Simply swab any photograph with Leroimystic and picture instantly disappears. Then, rub with wet finger, and Presto! Pictura snaps right back. Big bottle makes about 100 invisible photos. Postpaid for $I. FREE BOOK OF STARTLING PHOTOGRAPHIC BARGAINS Thousands of items offered at real bargain prices. Lists im- ported and domestic photo equipment and optical goods of all Kinds at tremendous savings. Sent with any item de- scribed above or FREE for the asking. Write CENTRAL CAMERA CO. 230 S. Wabash Ave. Dept. MME-5H, Chicago, U.S. A. MAKES$$$ MONEY in the Coilection Business Quickly and easily learn the science of collecting money for business men, merchants, doctors, etc.; no capital or canvassing necessary. Big opportunity everywhere, Write for FREE details, COLE & ASSOCIATES State Tower Bldg. Syracuse, N, Y. Dept. CM AVIATION depends upon engines, and expert knowledge of aviation engines is a long step toward success in this rapidly growing industry. International Correspondence Schools offer you a modern, complete course of instruction ‘in aviation engines, covering fully every feature of this important subject. Mail the coupon! OR CAN IN SAUN Box 2320- W, Scranton, Penna, Send me—free—your booklet on aviation and complete informa- tion on subject checked below: D Aviation Engines E Diesel Engines Aviation Mechanic O Radio Alrplane Maintenance H Chemistry D Gas Engines Drafting NGINO.0.0-sssseccensensnsccescereteecerenseecteoneceneearenvensonnensnenses d0bbeesenesesereseecsenens, - e eee eeeee cee ettcttenerienastaananneenceneneeenenaamnen ser reaseasensese vee neneneneesaagon =O: 136 HYPNOT, Learn _the Secrets of this MYSTIC POWER Hypnotismisa strange, subtlepower that gives. you the-key to the Inner Secrets of Mind Control, When this mighty power ja-released, you cap ever- come alt obstacles; make people obey your commande; strengthen your mem- ory; develop a strong. magnetic person- ailty; realize. your ambitions; banieb. fear end worry; increase your salary; an come master of yourself, friends and ac- quaintances— either sex. Th ege magic Be- crete are now revealed in-265-page book— “The Science olf Hypnotism,” This marvelous book explains the theory and practice of Hypnotism; wivesd stages uf ella how to select subjecta how t a glances discusses mesmeriam, magnetic al telepathy. Moat complete book published. SEND NO MONEY ane arena, bane aeaa Pay postman. 1.98. plus postage. Satisfaction muaranteed, nly Franklin Pub, to, 800 N. Clark St., Dept. 1705, Chicago TRICKS WITH 110 VOLTS Electric Fua! Make toy motors, buzzers, tops, machine guns, arcs, shockers, lights obedient to the voice, window novelties, floating rings, spirit rapping—all kinds of amusing and practi- cal electrical devices. Our book gives full direc- tions for doing 200 stunts with 110 volts, A.C. Price postpaid $1.00. CUTTING & SONS 54-D St. Hypnoti. CAMPBELL, CALIF. Get Your Own Patents Pay only government fees. Legal blanks and book with complete instructions, postpaid $1. CUTTING & SONS, 54-D St., CAMPBELL, CAL. The TASCO Slide Rule Will Soon Pay for Itself These rules surpass all other pocket rules— Can be carried in vest poecket—light in welght but always accurate—all metal con- struction—grease and waterproof, also in- destructible. With a TASCO Slide rule tho reading is never off the end of the scale. Low Priced and Built like a Watch. $5.00 cash or C. O. D. Catalog free. TAVELLA SALES CO. 23 West Broadway, New York “2° GUARANTEED co il ALUMINUM. SOLDER Ben) New Improved Aluminum Solder ALUMASOD makes sold- eae ering aluminum, sheet or cast, as easy as soldering tin. Special $3 & 4 kit now offered for only $I. Manufacturers and:-repairmen de- & mand it. Local distributors wanted. Send $f for introductory offer and full particulars. INDUSTRIAL SOLDERS CO. Dept. E, 5410 Wilshire Bivd., Los Angeles, Calif. z TN N N E E Plus Adapters and 12 Assorted Saw Blades. Adapters enable you to use any type blade from coarse to very fine, NEW FEATUREI x hardened steel grooved roller saw-guide ss formerly found only on_most expensive machines. Saw hae V-pulley for Sreadlo or motor. All metal construction. 15°’ ong, B’ high, 6 1-2” table. Sent postpaid on ea pt of $1.50, outside U. Booklet ‘*Make YourOwnJig e Daraan EE every saw. Send 3c stamp for folder describing all our tools. 480 St. Paul Street, Rochester, N. Y. “The Puzziemaker” . most complete line of latest ql # radio sets, service men’s supplies, replacement parts at low- d est wholesale prices. ALLIED RADIO CORPORATION "Sp: "As Ghieago” l Write for our new catalog + SEND FOR FREE COPY OF MODERN MECHANIX BLUEPRINT BOOKLET. Rre Thank You for Mentioning Modern: Mechanix and Inventions for May When Writing to Advertisers

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We are selecting a few more honest, dependable men to establish in their own business—guaranteed mothproofing and furniture reviving and clean- ing. No experience. Lasy to learn. Join this nationwide chain of franchise owners earn- ing $4 to $9 from each: hour of servicing. Everything fur- nished——electric machines, ad- vertising demonstrators, etc. Short hours—large profits. No Shop Required Work is done in homes, offices, schools, hotels, theaters, hospitals, clubs, lodge rooms, churches, instilutions, etc., and for apartment owners and auto-dealers hy you or your service-men. Profit on both materials and labor. Clean, disinfect, and revive furniture, auto upholstery, ete. Original colors return, Nap again stands erect and even, Upholstery, tugs, furs, clothing, blankets, piano-felts, auto interiors, etc., are made non-eatable by moths or car- net beetles by patented process to which our franchise owners exclu- sively have rights, Method success- ful 12 years. U. S. Government Teports, ‘‘Moths are present in practically every household.’” We Advertise For You The H-S-C sales plan is based upon bringing customers to you and getting invitations to come to them. Business grows steadily through customers’ recommendations. W. A. Looklebill writes, “‘Got 2 orders from ladles watching job.” R. W. Johnson's first job brought another. The coupon below will bring full details. A Life Income ee a HOME SERVICE CO., 175 Dr., Racine, Wis. i Tell me in detail how I may have a life income in a I 1 business of my own bullt upon satisfied customers. I E Sime gorrie nidie eee | l Kaaress eee eee eee eee eee eee eee eee eee eee I I CUP samir KRAE AE A seceeee. State REPEAT and VOLUNTARY or- ders build a Ilfe-time business founded upon satisfied customers. As little as $77 puts you in OWN business—pay balnnce from profits, We do advertising for you and fur- nish enough materials with equip- ment to return TOTAL investment with a large profit. MAIL COUPON TODAY WHILE TERRITORY IS OPEN! OWN a Business We Help You Get First Customers! Others Earn Up To $90 a Day K. Anderson writes, ‘I earned $90.00 clear one day. Most of my business comes through store-cards, folders and voluntary repeat orders." W. Miller writes, “Have already done 25 jobs and havo interested nearly 100 prospects," E. N. Hargrave writes, “We have a large variety of customers including hospitals, theaters, clubs, apartment buildings, offices, stores and auto- dealers. We get new customers through folders, store-cards, our 12 canvass- ers, ete., but our steady and frequent repeat orders are building our business.” W. Tesnow writes, “My first day, I took in $104.00. Had $88 net profit. Rejuvenat- ing does beautiful work.’’ A. W. Carter’s first Job from his circulars amounted to $79.60. ` Here is an oppor- tunity for honest, dependable men. WANT A STEADY JOB? TRAVEL for “UNCLE sam 7 FRANKLIN INSTITUTE, Dept. B-299, Rochester, N. Y. Rush to me entirely free of charge: 82 page book, with list of U. S. Government Jobs and particulars telling how to get the job here checked. MANY OTHER U.S. GOVERNMENT POSITIONS STEADY WORK ¥¢ Š ...Rallway Postal Clerk . ($1900 -$2700) MEN—BOYS 18 TO 50 9 ...Post Office Clerk - ($1700-$2300) © ...Glty Mail Carrier - ($1700-$2 100) Short Hours Pleasant Work % ... Rural Mail Carrier .. - (82100-53400) Rapid Advancement . Permanent Employment s immigrant Inspector sli E a rai TIE @2t00-$3000) MANY EARLY EXAMINATIONS Y EXPECTED. S Nae ea S A A OsRRS MAIL COUPON TODAY. TOMORROW z YOU MAY FORGET. # AATE neiaie E EEE Siaa sl Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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50° | SUBSCRIBE | $1.00 5-month sub. 1-year sub. (Formerly $1.25) on} | (Formerly $2.00) | } | Foreign 50% Extra Ai O W i t Foreign 50% Extra OUR NEW S-A = FOR BUILDERS "The Amateur's Tabloid Aviation Journal” Here you are, boys! What readers asked SPORTSMAN AVIATION -to give them is now ready. Just what you, too, have been waiting for. A real true honest-to-goodness lightplane of good de- sign} simplicity and low-cost. OUR S-A “MOTH”! A one-place low-wing lightplane which every amateur will dream about! Powered with the highly successful LONG 35 h.p. Harlequin Twin. Can be built for $350.00 or less. An enclosed cabin is optional. Its perfect balance assures stable flight with utmost safety. And a speed-range almost unbelievable. Actually worth $5 alone. s for one-whole-year to the Join the ranks! Subscribe to the New SPORTSMAN AVIATION and get your copies for clever models of entirely original designs. Flying stick, fuselage and accurately scaled -scale types. Modern, war time and old historical non- : Aying scale replicas, The Aerodynamics of Model Flying, and other interesting and highly . valuable articles by Prof. T. N. de. Bobrovsky. Many interesting designs on Gasoline Engine Modelplanes, including the new types of little 2-cylinder single and double- threw; verticle, inverted and radial. Car- buretors, ignition, spark plugs and all the other accessories. Foreign staff writers include such well known modelers as Mr. H. Miller, librarian of a foremost English model flying club, and closely affiliated with all of Europe in modeling. Also kinks, readers’ activities, and rare war photographs by one of the world’s greatest collectors of authentic World War photographs, drawings and data— Mr. Joseph Nieto, Modelplane Editor. detailed scale drawings for building Specifications: lightplane. «30 ft. 4 «. 4 ft. Airfoil curve Clark Y-15 Length 17 ft. 6 in. Height A i Weight light .oscsersetiescssrss Weight loaded High speed .... Cruising speed . Landing speed . Subscription! No. 1—Complete set of enlarged Subscribe Now! ue (formally L.A.A.), Leslie Long, Chairman. our membership due This Combination FREE Offer Is Naturally Limited. S-A “Moth”? 35 h.p. 2—We will pay y FREE Drawings and Membership with Every 1-year $1.00 Amateur Aircraft Leag your own No. For Lightplanes, Sa ‘sPORTSMA Sportplanes and AN 1 ATi J | For Modelplanes; Stick, Fuselage 2 ano 3 and Scale.... Raceplanes .... E | MODELPLANES mgee 138 Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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Seven Tools In One Mortising, Routing, Drilling, Carving, Sanding, Shaping and Surface Grinding HIS remarkable new “Dera” Bench Type Drill Press performs these seven operations efficiently, con- veniently and accurately. Is almost a complete workshop in one tool. Built to stand up under heavy production work—yet is priced so low as to be within the reach of every home workshop owner. A brand new “Delta” model, a quality tool throughout—with numerous inter- esting features. For full details mail the coupon TODAY ! A Complete Line of Motor - Driven WOODWORKING TOOLS! “Delta? Woodworking Units are convenient, portable and com- pact. All ae available in a large variety of combinations and at rices to fit all needs. The “Delta” line includes: Jointers, Band ws, Scroll Saws, Circular Saws, Woodturning Lathes, Drill Presses, Boring, Routing, Sanding and Mortising Attachments— and a full line of accessories, FREE Catalog Describes the latest developments in motor-driven wood- working equipment at the astonishingly low “Delta” price levels. Completely illustrated. Also_full details of 40-DAY TRIAL offer and ‘Easy’? Payment Plans. Mail the coupon. DELTA MFG. CO., 3775 North Holton Street Dept. MS34 Milwaukee, Wisconsin a Se ee eee eee | DELTA MFG. CO., $776 North Holton Street I Dept. M534 Milwaukee, Wisconsin B Please place me, without obligation, on mailing list § to receive the FREE 1934 “Delta” Catalog of Quality Woodworking Tools.: Also send full details of your l 10-Day Trial Offer and Easy Payment Plans. Name... -Age? Address. EBCRING- DRILLING Boys! Learn Broadcasting and Telegraphy a WIN THIS MOTORBIKE! G the airl Get thi Oh, boy! Sie” koti to yor radio loudspeaker, and fool your friends. Entertain the family! Train for a broad- casting job. .. . Or get this signal set and learn telegraphy. Send wireless and night blinker signals . . . You can get both these prizes, and hundreds of others, including this 1934 deluxe model Ranger Motorbike — WITHOUT COST. Earn money, too! It’s easy! Just deliver three well-knownmaga- zines to customers in your neighborhood. Will not interfere with school or play. Hurry! Mail the coupon, and we'll start you at once. MAIL THIS COUPON! Mr. Jim Thayer Dept. 374 The Crowell Publishing Co. Springfield, Ohio Dear Jim: Start me as a salesman at once, so I can win MONEY and PRIZES. Name. : —Age. Address City. CS tate. Thank You for Mentioning Modern Mechanix and Inventions jor May When Writing to Advertisers + 139 Get This Microphone NO COST! WIN 300 PRIZES Without Cost!

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” Here are today’s low- est prices on tires of “SS Proven quality... Increasing - ee thousands of satisfied motorists know. a by experience that standard brand tires reconstructed by the modern Scientific Midland process are best. Chicago’s oldest, most reliable rubber com- pany positively guarantees you 12 months Bervice under everest road conditions. 4 BALLOON TIRES Size Rim Tires Tubes 29x4, EH $2. 15 sp- 85 29x4,50-21 Bor4 E02 2:30 REG. CORD TIRES Size Tires Tubes 5 [GENUINE HOT-SHOTI Spark Intensifier = All Other Sizes = ALL TUBES NEW GUARANTEED DEALERS 135 WANTED makes starting Send $1.00 0 De! osit with each tire ordered, f easier; puts new Balance G. . If you send cash in full | pep in cary easy to È deduct 5%. ou are guaranteed a year’s sery- Ptal li—no tools. ice or replacement at 4 price, Order today. MIDLAND TIRE & RUBBER CO., Dept. 4223 1000-10 West Sixty-Third Street, Chicago, IMlinois on HAAN AAA AAT: WMOOUUAUUOSUNO f sSEREEREES Soo PPP iii ii i OOO NND AARWWNODONO UR. OT saves ga asa oil, climinatescarbon} WWWHWOWWWNNNNNNN! st TO WELD Steady Work—Good Pay CMU Big Demand in this NEW Industry. Learn this great trade QUICK EASY. Complete Outfit and Course of instruction ut low cost NOW. Pay weeltly as you jearn. Write for full particulars and Temporary Special Offer Quick. COLEMAN ELECTRICAL SCHOOL, [623A Main, Kansas City, Mo. [emane BRAND Call on dealers—demonstrate World's greatest line Counter Card Goods: Aspirin. complete line Razor Blades, Mercurochrome, Peanuts, 65 big. new profit makers, Powerful, eelf-selling displays. Big ‘profits for dealers ond you, Permanent, repeating Business. No investment to atart. Send fort Bi CERES FREE Katalog. WORLD'S PRODUCTS Dept. wore Spence nd. SMALL MODEL OPERATORS Our Catalog 17 contains engines and motors for gas, steam, electricity or water. They may be obtained complete or you can assemble or build them using our parts and castings. Model boilers, real miniature valves, fittings and machinery, just like those in the large power plants, but much smaller. You can hold some of them in your hand. Or also, engine modelmaker’s supplies. Send 25e for your copy of the new Catalog 17. Canada, 80c. Refunded on first order. d We thank those many customers who have called on us this summer. If you are not one who has had the opportunity of coming to Chicago to see our line, send for the new catalog. HOWARD ENGINE & MFG. Co. 2417 N. Ashland Ave. Chicago, Tt. ) RTOON YOUR WAY Perr SUCCESS! VJ DON'T COPY - LEARN TO ORIGINATE! RAYE BURNS will teach you HOW to Cn ae ORIGINAL CARTOONS ag home that you as 85 Send name and address for free detaile. Only- sae SELL! Course has 26 lessons and 600 illustrations, RAYE BURNS SCHOOL, Dept. F-X Box2194, CLEVELAND, OHIO DO YOU NEED MONEY TO FINANCE YOUR BUSINESS OR INVENTIONS. write for Details INDUSTRIAL FINANCE SERVICE 624 Insurance Exchange Bidg. Dept. D-14 Detroit, Mich. THE NEW AERO INTERNATIONAL ALL-WAVE 11 TUBE SUPERHETERODYNE DE LUXE volume control. loud speaker. $9 Q75—Tubes 7.75 Amazing Round the World Receiver A With 2 matched dynamic speakers. 15 to 550 meters. Automatic : Listen in direct to London, Paris, Berlin, Sydney, Buenos Aires and other stations throughout the world. Aero World Wide 1 Tube Short Wave Receiver For headphone operation—15 to 550 meters, With amplification can be used on For the last seven years this little wonder set has been one of the biggest sellers in the Short Wave Field. Write for compete Free Catalog. CHAS. HOODWIN CO., 4240 Lincoln Ave., Dept; F7, CHICAGO, ILL. e INVENTIONS THERE'S money and fame in inventions. But there are many essential things you must know in order tọ capitalize your talents. You can now acquire this knowledge through spare- time study of the International Correspondence Schools’ new and practical course in Inventing and Patenting—Jjust off the press, Ask for complete information. MONEY FO INTERNATIONAL CORRESPONDENCE SCHOOLS Box 2323-W, Scranton, Penna. Please send full information about course checked: O INVENTING AND PATENTING O Chemistry U Radio O Aviation D Refrigeration D Air Conditioning D Architecture O Accountancy D Advertising D Electrical Engineering O Drafting D Show Card Lettering [O Good English hereneesrerevonneovet MAGEE ESS... crescsersvrssererserrsccecsrerscesssconengosesttersceteannnserseenreneascscoesen seseacaseesene® BUILD DUTCH WINDMILLS Beautify Your Lawn and Garden MAKE api build perfect models from accurate MONEY eh, Eve RINTS we supply. Great Pleasure SELLING Food Profits sellin, Hinlahed models. tg OTHERS ye Model Bid (Hexagon ‘on style, in, high) only 76c, Model B2 ACTIVE Bure WINDMILL OPERATING DUTCH GIRL CHURNING BUTTER, ONLY 50e. Knock Down Kit for Model B25 (all materials needed, ready to asgemb]o) only $4.00. Lawn cut-out patterns, Sunbonnet Girl, Dutch Boy, Tulip Girl and {Holland Pair--only 35c each, or 4 for $1.00. Send i0c for catalos. — Miniature Dutch Boy Pattern, sent with catalog-- hed, 7 in. high, six colors. Catalog and Dutch rst order. CRAFTSMAN'S MODEL CO. peat" Bt. aoso N. 41st St. Milwaukee, Wis. AUTOMOBILE COMPASS Mave you ever taken the wrong road and traveled many miles before discovering your mistrke? This new AIRPLANE TYPE # COMPASS constantly tells your direction of travel. Stirks to windshield. Base 1%’? diameter. ONLY $1.50, POSTPAID. SAT- ISFACTION GUARANTEED dr your money refunded if returned within ten days, Agents Wanted! Box 246-A5, WARREN, OHIO HULL MFG. CO. —————— a ae e 140 Thank You for Mentioning Modern Mechanix and- Inventions for May When Writing to Advertisers

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Man CAN Now INNER POWER As Revealed by New World Teacher Yogi Alpha, internationally known Psychologist and Philosopher and ac- claimed New World Teacher, is bring- ing Health, Happiness and Financial Success to Thousands by his Startling Revelations that: —it is easier to succeed than it is to fail. USE S YOGI ALPHA Internationally kuown Psychologist, Philosopher and Mctaphysician, President Y. A. Psychology League; Editor “Psychic Digest,” America’s newest Psycholo- gy magazine; Founder of “Psycho-Logic,” acclaimed a new world teaching. —hard work will never bring you success. It is far easier to progress and realize your wishes when you don’t use a great deal of conscious effort. —there is an Inner Power within everyone so dynamic and forceful that it can carry you on to complete happiness, health and financial success almost over night. —a correct understanding of this Inner Power can bring you a more perfect and beautiful body, and give you an attractive and magnetic personality. —all of the great teachers and prophets of the past have consciously ox unconsciously used a strange power within themselves to aid them in their wonderful works and so-called miracles. —a correct understanding of this mighty power can enable you to duplicate the feats of ‘any great teacher that has ever lived. —the world itself, and all of the laws of the universe, depend upon Mind for their existence, and a proper understanding of the laws of Mind will enable any individual to create the things he needs or wishes. Write for Amazing Free Lecture, “Key to Your Inner Power” The story of a new and revolutionary teaching which reveals a elrange inner power so dynamic and forceful that it can carry man to complete happiness, health and financial success almost overnight is told in a remarkable 5000-word Lecture ‘‘Key to Your Inner Power —the Seven Steps to Suceess’’—recently compiled by Yogi Alpha, internationally known psychologist and philosopher. He tells of his discovery that all the laws of the universe can be controlled because the laws themselves depend upon the great universal Iming for iheir existence; that every mind is part ef this universal mind, and if you learn to use this dynamic energy it can bring com- pleto fulfillment of your most cherished ambitions, WITHOUT PHYSICAL EFFORT. Yogi Alpha further belteves that this power is not limited Lo a fortunate few, but is latent in every human being, regardless of train- ing, education or environment. This secret Key is so simple to under- stand and apply that it ts amazing no one has found It before. If you have wondered why many dream of success and happiness, without fulfillment, why they struggle and toil through the deadly monotony of daily grind for the few who seem tno get ALL the good things of life, you will receive the answer in ‘‘Key to Your Inner Power.” And, if YOU have had visions cf wonderful achievement, glimpses of riches you could almost reach, he will show you that these visions are PROOF that they are possible for you to attain; that they are part of your INNER POWRR that can be quickly tapned if you are given the KEY. : The author offers for a limited time to send this amazing Lecture FREE of cost or obligation to all sincere readers of Modern Mechanix Read What Others Say of New Found Health, Happiness and Success cogs and Inventions magazine who wish to begin life ANEW. It esplains haw you may recelte this new and revolulionary teaching in the privacy of your own hone, and reveals the astounding secret, which mastered, may enable you within the next few months to increase your earning power, attract new friends and make your visions of achievement, health ond happiness come true. Mail the coupon TODAY for your free copy of this unusual Lecture ‘which may unlock the reservoir cf vast riches within YOU. FREE "Key to Your Inner Power”! YOGI ALPHA Psysho-Logic Institute, | Bex 98, Dept. 81-D, San Diego, California. Please send me your FREE Lecture, “Key to Your Inner l Power,” which reveals the secret of health, happiness and finan- | elal success and explains how I may receive this new and revo- | lutlonary teaching in the privacy of my own home. “I now know greater peace of “Am in much better health | x mind, more assurance, greater faith and mind and throwing off the NATO sees eee SURES a A aa a pee SH I in myself. Through the wisdom burden I have been carrying.” and enllghtenment of the Les- Maj. M. B., Los Angeles. j AAATESS sesorisesreos EEEE Ea SERRA NE E S | sons, I am envisioning a vista, “I saw a marvelous change in never before experienced, of se- the fourth day, and I received a ca State curity. and a sense of power.” job that morning.” C. B., San ty ...eeee aa Ria SRG Nae eS RR Soi ig gaa SBS DAR ghee Wa Sic: gles F. A. C., Los Angeles. Francisco. a ee L Wos Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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ERE is a remarkable book for inventors. before. Saves time. Saves work. Saves money. Tells you what inventions are needed now, and what is offered for them. Lists and describes the ONE THOUSAND NEED- ED INVENTIONS in these fields : General Problems ; Auto- motive; Mechanical ; Electri- cal; Chemical; Radio; Aviation; Marine. Separate and ex- tra chapter on the TEN MOST NEEDED INVENTIONS. FORTUNES FOR IDEAS This wonderful book ae give you one idea that will win you a fortune. If you want to invent—KNOW WHAT INVENTIONS WILL PAY YOU MOST. This book tells you. Compiled at great expense, and edited by Raymond Francis Yates, formerly Managing Editor of a leading scientific magazine. Over 100 pages durably bound. SEND NO MONEY Send us your name and address plainly written, and your copy of this remarkable book, “1000 Needed Inventions,” will be sent immediately. Pay ‘the postman only $1.00 plus as er on arrival. Money back after 10 days’ examination if desired Limited edition. Write NOW. (Outside U. S, $1.25 cash with order.) BUREAU OF INVENTIVE SCIENCE DEPT. 15 CHESTER, N. Y. PATENTS BOOKLET FREE HIGHEST REFERENCES PROMPTNESS ASSURED BEST RESULTS Send drawing or model, WATSON E. COLEMAN 724 9th St, N.W. Patent Lawyer Washington, D. C. COUPON TNT | rete sena me u nformation JATE EN 21234 BROADWAY | sna 'ittertare REGISTER YOUR P NEW YORK PECOCAR TRADE-MARK ey Redbad out obligation. REG. PATENT ATTORNEY PROF ENGINEER | Yumo WHAT IS YOUR INVENTION? Send me a simple sketch of a model for as Cabet CONFIDENTIAL CONFIDENTIAL ADVICE—DO IT NOW! }o.-nsreerernee ITNOW!! a Doubled Strength in 30 Days! Rut R GUARANTEE to slve hg obus The world - famous Stebb Ing. 4-in-1 r, NORMAL WEIGHT, Staying Power anq bursting vitality. (3) Tt develons a Strong Will and rigid SELT- CONTROL; and (4) It includes an amazing “Success” and PERSONAL į MAGNETISM Course. Send 3e for 9 further details, guaranteed testimonials, ete., or ENROLL NOWI Come Re Course, only .......... o straln, no extras, no ap- paratus to purchase. “Worth $10.00” Recommended by the World’s Leading Health Magazines. “lows my to fos tabb! Conrse’’, S. vey THE STEBDING INSTITUTE, Dept. MM-5, Forest Hills, N. Y. hysi ipa Fortunes Await Needed Inventions (Continued from page 88) the happy solution has yet to appear. Summer is just around the corner and the writer wonders if inventors have ever given the common window screen a thought. Sure- ly if much thought had been given the subject we should today have a screen that is adjust- able in two dimensions in place of one. In other words why not a screen that can be widened and lengthened at the same time so that the amount of fresh air coming into a window can be regulated? Who can invent a kitchen table and iron- ing board combined? You simply swing the top of the table back and down and up pops the ironing board all ready for use. Crashing Airplanes for the Movies (Continued from page 40) Suppose, for instance, the director calls for three pilots to fly close by the camera ship, move into a “griddle stack,” (three planes one above the other with no more than two feet between landing gear and wings) and break out quickly. Frank Clark, whose favorite stunt is land- ing from a spin, takes the top plane. Roy Wilson (later killed while attempting such a stunt) goes into middle position. Gordon flies the bottom ship. With perfect timing, in smooth air, the three ships come together, the lower planes flying up against the bellies of those above. Now to break away. After three minutes in front of the camera, the order is signalled for the breakup. Clark barrel-rolls up and out of the picture; Wilson flies straight ahead and dives, while Gordon sticks his nose down and slips out to the right, away from the cameras. Perfect timing and a perfect shot! Difficult though that maneuver may be, horizontal “crashes” require more nerve and cool-headed flying than any other, Picture this scene: Two airplanes are flying wing- to-wing when suddenly a third ship crashes head-on with the plane nearer the camera. Of course pilots and valuable planes are not sacrificed. The camera “cuts” at the moment of seeming impact and miniatures provide the real crash. But the preliminary action is real and fraught with danger. The secret lies in the angle of the cameras which stare upward at an angle of 45: de- grees. Thus the outside plane, to be properly in line, flies at a slightly higher altitude than the nearer ship. The third plane, flying head- on, takes the altitude of the outer plane. They approach. When the engines are within thirty feet of each other, the outside pilot pulls sharply upward and the approac ing pilot continues his line of flight, passing twenty feet from the wings of the inside plane. Thus they appear at this moment actually to collide. If this maneuver is per- formed 700 feet distant from the cameras, the collision will occupy 10 frames of film, representing eight hours of effort and a cost of almost $3,000! Of such tedious work are air thrillers manufactured. i ht (Do? 142 Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers

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“Says Henley of N. Y.” It's the New Empire Electric Trouser Presser which puta in knife-edge creases while you-count 10. Robb sold 57 to one group of men in 2 hours. It’s the demonstration that puts it over big, Lee made $297 hig 2nd month. You are sure to’ make real money from your first day on. ProfitsinAd ts in Advance advance. Simply write order. Bonus given. quickix—Areraze Sale made in 6 minutes. out. Big repeater. Patent protection. Your profits in Empire sells Newest. thing ~ Special Offer gires you FREE Pres- ser and complete set of Tested Sell- F ive territory. ACT QUICK, — aa a pe EASY #5. A DAY\\ flame. A sure sale wherever artifi- a a Get Inon This Packedon ingividna) cardawith instructions. ACT NOW New Method Blds., Desk MG-5, BRADFORD, PA. ACTIVE MEN__19 to 50__earn good pay as Railway and Bus baying up to $140 per month, plus expenses, to start, Zh ing Material. We guarantee you will make sales. Write for Plan and exclus- EMPIRE ELECTRIC CO. Dept. 105 Cincinnati, Chlo Possible with new magic invention that ' =~ lights gas instantly without sparks or Ee cial gas is used. Retalls for 25c. i Zi S MYSTERY GASLIGHTER Big Money Sample 10c, Rush $9 per gross or $1 per dozen. Maker — NEW METHOD MANUFACTURING CO, L = TRAFFIC INSPECTOR jh RAILWAY AND BUS LINES NEED TRAINED MEN l x Passenger Traffic Inspectors. Onr short home-study. course guickly qualifies you and on completion we place you in a position, er, refund tuition. : ic Advancement is rapid. Work ie interesting healthful (outdoors): travel or st near home. Write for Free Booklet. Standard Business g Training Institute, Div. 6105, Buffalo, N. ¥. 600 MONEY MAKING IDEAS. ONLY 35c POSTPAID All guaranteed to be money-makers, proven and successful in actual use, Many from ÙU. S. Government records. Many new and unusual. A storehouse of whole and spare time opportunities for both men and women. (Not mail order plans.) Send either coin or stamps. ENTERPRISE BUREAU Tower E-M Syracuse, N. Y. Brings Ruined Health . Wasted Dollars The most inveterate smoker or chewer will positively HATE tobacco in any form within one week, using KILL-TOBAC. Com- plete, guaranteed treatment costs only 5 $1 postpaid. KILL-TOBAC is not a a drug or internal medicine. Leaves no bad effects. KILL-TOBAC ends the craving sim- ply and quickly. Men and women welcome this new, easy way to freedom from the Tobacco habit. Send $1 for complete treatment and money-back guarantee. Salesmen Wanted to Introduce Kill-Tobac KILL-TOBAC REMEDY Co. 610B Kasota Bldg. © Minneapolis, Minn, it Thank You for Mentioning Modern Mechanix and Inventions for May When Writing to Advertisers \, It’s Paying Cyclopedia cf Civil Engineering 7 great volumes. 2,800 pages. 1,600 illustrations. New edition just off the press, by. twelve of America’s- greatest. engineers. Includes: Surveying; bridges, railroads,. steel structures, mu- nicipal engineering, water supply, road | building, etc, Spanish Grain Flex- ible Covers Gold Stamped Loaned Free! ig | “Civil engineers are wanted NOW. Enormous amounts are being spent fn all kinds of publie works and not a dime is spent until the Engineer hae prepared plans, Then He muet direct the work, tee a big job and there are not enough men to go around. Everywhere you go, you see road work going on—weter and sewer systema being built — vast projects of all hinds. Here ia Your Opportunity to get the necessary (raining right at home. These books are complete an simply written so anyone can understand them. Start now on our FREE examination plan. Mail the coupon without obligation. American Technical Society a merican Technical Society. Dept. G-5320, Drexel at 56th St., Chicago tto BORROW the CIVIL ENGINEER ING. Cyclopedia for 10 days FREE. J wi). To prove you can learn Civil i i i lad! the few cents express, but Iam te E = Bons be ay nothin for the loan ofthe 7’ bi; volumes a a T e fi return them within 10 days. IfI wish te cause no description here could do it justice, to let jeep them 1 will send you $2 aftor tho 10 days. l advertising price you sce for. yourself the hen $3 2 month untll special acope and siniplieity, the = 29.80 iy pald, Send latest Edition. authority. and- quality of = this great’ home: reading = Name.__ course. Cost and terms are "x within your reach. Send no money—just mail the Aadio cerana Aitach lettey stuling age, occupa- ion, employer's name and address) PATENTS 111 W. WASHINGTON ST. CHICAGO, ILL. . Send me your free book “THE INVENTOR’S GUIDE” NAME = af ADDRESS. CITY. SHOW CARD LETTERING Here is the very course you need if you seek a position as a Show Card Letterer or Sign Letterer, or want to have a business of your own. Complete and practical and especially arranged to’ meet the needs of the student who studies at home. Written. by E. L. Koller, Principal of the International School of Art, member of the American Federa- . tion of Arts, and The National Society of Crafts- men. Mail coupon for Free Booklet. es ee ee es ee ee ee ee ee ee ee ee es i INTERNATIONAL SCHOOL OF ART Division of the Internatlonal Correspondence Schools Box 2317-W, Scranton, Penna. | l l your home-study course in | O Show Card Lettering l | l 5 Without cost or obligation, please send me full details of | O IMustrating D Cartooning ! NAME! 5.05 csc0ss0s2ceecdsteesaessdacadscul sibstans tenes ASN AANA aa i | GOS 2.6 ius es shies stew cd eh cab eats cee EA A N { ee ee ee oe ee ee Se ee oy ey oe od Mpe 143

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Model of the First Typewriter An IMPROVEMENT Improved Typewriter The Difference Between “Improvement” and *Fnvention’’ Very few inventions are entirely original. When a friend says of your inventive idea, “Oh, I’m sure something like that has been patented already,” the chances are that it has. But your idea may have certain differences or improvements that earn its right to patent protection. The first step is to determine, through patent office search, if there are exist- ing patents that bear on your idea. Ciarence A. THE FIRST STEP First—secure an experienced Patent Attorney to look after your interests at Washington. It is not the part of wisdom to put-off or delay. And remember——U. S. Patent protection is the only way to ob- tain the exclusive right to manufacture, use, or sell your invention. Importance of the Search”? Tecan help you immediately. My offices are in Washington. Send your idea to me in rough form. My experienced examiners will make a search through the Patent Office to see if your invention has been anticipated. I can give you a report at once—and this is something you must have, because it decides what future steps you should take. i Models and Finished Drawings Unnecessary Don’t spend money or time on finished models or drawings before you know your idea may be patentable. My large staff of experienced patent searchers can handle. a search from your description and rough- est sketch. The main thing is to put it in my hands as promptly as possible. Facts About My Service Iam a registered U.S. Patent and Trade- Mark Attorney, serving inventors all over the United States. My organization is complete in every particular. I have Draughtsmen, Experienced Searchers, and Attorneys to serve your interests. I have had years of experience in patent matters and know every angle of legal approach. I will secure protection for your idea if it can be done! But the longer you delay—the harder it may be for me to serve you. Reasonable Fees— Easy Terms Don’t worry about finances. My fees are reasonable—and I can arrange convenient terms of payment. It has always been my O Brien 317-F ADAMS BUILDING Ww WASHINGTON, D. C. 7 wrt po due raat 144 Thank You for Mentioning Modern Mechanix and Inventions for May When Writing: to Advertisers

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wet) Ih ae Ay custom to permit my clients io pay for their appli- cation in installments as the preparation of the application progresses in my office. Send for Free Book In order to know the steps necessary in securing a patent, send for my FREE BOOK, “How to Obtain a Patent.” This book tells you everything that must be done every step of the way: now the Patent Laws protect you, what an attor- ney does for you, ete. Also x RECORD of Tf you prefer to use a form made spe- cially for the purpose of re- cording the descriptive out- line of your invention for my searchers’ use at the U. S. Patent Office, write to- day for my Record of In- vention form—it will guide and assist you. It enables you to make a sketch of your idea and have it wit- nessed in a manner of value to you asevidence should the occasion for evidence arise. My FREE BOOK tells you how to use this form to pro- tect your interests. INVENTORS: MAIL THIS COUPON TODAY i Please send at once your book, “How to Obtain a a” 4t : ” Simply fill out this coupon | Patent” and your “Record of Invention” form. and mail it. You receive my FREE BOOK and my Rec- rd af lavenir torm wth NITE 6400234 bceexevansd bon abarieedniaees cut charge or obligation. However, it would speed up AQGYVGSS. 245. ¢c2ne bets deaawee bios euee eee matters if you would send your idea and $10.00 Search Fee at once so that the very important preliminary search can be started for you. i sechi eS (Be sure to write or print name clearly) QD «= Thank You for Mentioning Modern Mechanix and Inventions Jor May When Writing to Advertisers 145

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Chemical Lighter Latest Novelty Invention Current business and inventive genius speeds up the modern tempo by design- ing new devices and improving old ones. No flame is needed with this fuel cartridge and chemi- cal wick, lighting on contact. Reserve case shown below. A power unit and oil saver installed in the intake manifold prevents admission of raw gas- oline in combustion chamber and crankcase. Phoironic exposure meter for photographers, acting on photronic cell, automatically records amount of light entering lens. Companion dial gives shutter opening and speeds. A boon to builders are these “screw nails” which drive like nails yét turn and hold with screw-like tenacity.. 146 A dog shower spray with brush and hose, may be attached to a water faucet. Brush holder contains soap, while the turn of a key provides clear water for rinsing. A dandelion killer punctures, scores and injects a killing fluid into the roots of lawn pests with- out injuring surface grass. A portable picnic table, mounted on a tripod, can be placed in a level position regardless of ground contour. Height is also adjustable. A new radio instrument kit now on the market contains devices for measuring all ranges in experimental field except D.C. micro-amperes and radio frequency milliamperes. , Warm kennels for dogs are possible with a new electric pad unit, operating from a light socket and placed in the dog’s box. Two filament display lamps, patterned after the “bright” and “dim” auto headlight bulbs, are available in two-way wattages, resulting in a saving of current in dull hours. This novel coaster wagon is equipped with balloon tires, brake drums on rear wheels and special steering gear. A new patching compound, inexpensive and easy to apply, finds countless uses around the home or garage. The compound will patch anything from shoes to auto tires, working equally well with leather, rubber or cloth. An electric soldering iron is now available at a price well within the range of every man or boy. Invaluable for radio, auto or electrical repairs, the iron comes complete with cord, plug and length of solder. An automatic pencil sharpener, motor driven, starts and stops by insertion or removal of pencil. Various points are easily obtained. Elimination of spark plug interference is a new auto radio feature now available, guaranteeing perfect reception without use of spark plug “suppressors.” Editor’s Note—Information on any of these items can.be obtained by writing MopERN MECHANIX AND INVENTIONS. Manufacturers are invited to submit material for this page.

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Other Men have Read and Profited by this FREE BOOK about PATENT PERHAPS IT WILL BE OF.... DEFINITE INTEREST TO YOU HIS book was prepared for men of ideas—men who have an article in mind that will make money, save money, save labor or give pleasure. Leading thinkers agree that the opportunity for the inventor is as great today as ever before—that the world of a few years from now will be radically different from the world of today because of the contributions to progress that inventors will make. Now is the time— if you have an idea—to see about fully protecting it so that you can be sure of your just share of whatever profits it may make. Little ideas Have Big - : Commercial Possibilities Don’t think that to be profit- able an idea needs to be com- plicated. Simple articles—just a person’s hunch—have often proved profitable. The crinkly lair pin, the metal tip for shoe laces, the paper clip, and liter- ally thousands of simple things that most of us use constantly were all the product of invention. Also improvements on patented articles sometimes proye more profitable i than the original article itself. If i you hav ast see what i e and HOW P YOUR, OWN te Inventors Do You Know Exactly how a patent applica- tion is prepared, what steps you can take NOW to assure your right to your idea, how the patent- laws pratect you, what ta do to secure financial assistance? This book br and other inter points; also ill portant mech electrical princi fer it NOW. Also FREE With the Book This is-an ‘Evidence of Invention” form on which ean sketch your idea, ribe it and have it wit- ed. This helpful form will be sent to you along with our book. Tt may prove valuable to you later on as evidence, w YOU CAN PE RIGHT TO IT. Don’t Delay - Send for Manaa VICTOR J. EVANS £ CO. protect an idea by means of a United ESTABLISHED 1898 States Patent. Remember that someone else may be thinking along the same REGISTERED PATENT ATTORNE S lines that you are; and the Patent Laws favor the man who gets his application -for a patent on file in the United States Patent Office first. You may have much to gain—and nothing to lose--by acting promptly, Delays of even a few days can actually mean the loss of a patent. Learn the important facts about Patent Protection at once. 605 E, MAIN OFFICE, Victor Building, Washington, D. C. RANCH OFFICES: 1640D, Conway Building, Chicago; 3D, Broadway, New York: S281. Fidelity Philadelphia rust Building, Philadelphia: 514D, Empire Building, Pittsburgh; 1010D, Hobart Building, San Francisco. Please send me your free book, “ your “Evidence of Invention Blank. 7 tent Protection,” and 35 Years of Proven Service Wor thirty-five years, this organization of Registered Patent Attorneys has served inventors from all over the i country—all over the world in fact. What you write i us is held in strict confidence. We have a large 3 staff of patent specialists to give you expert and prompt service. Yet because of a high- ly efficient organization, our fees are low; and we also help you with deferred pay- ments. The coupon makes it convenient for you to communicate with us at ‘ones. Take F advantage of it today. WS Bo evs raat POMS -hasds a aameeics y PUES ES PATEE sa Sreet goad NO soa uaii Ea e a CRY sanes nanets ortor ENERE a SOn Linens ti eo a a E e a

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ME BUSINESS NO HIGH PRESSURE SELLING NO HOUSE-TO-HOUSE CANVAS INE INCOME EQUAL TO REQUIREMENTS OF THE HIGH-GRADE BUSINESS MAN G. F. Pegram, Texas, clears $315 in his first 5 days in this business. J. C. May, Connecticut, ck $262.35 in 9 days. E. Foyer, Cali- fornia, makes $4,920 in 8 months’ time. C. W. Ferrell, Ohio, writes: “My earnings have run well above $1;000 in a month's time’’—he has made over 1,000 sales, paying him-as high ay -$5-.to $60 profit each sale. J, Clarke Baker, Connecticut, sells 18 firms in 3 days’ time, netting $151.71 clear profit—over $50 a day profit. Writes that 9 of these 13 firms are already using second or third repeat refill order. And so on. These men had never sold this item before they came with us! How could they enter a field totally new to them and earn such remarkable sums in these desperate times? Read the answer in this announcement. Read about a new business that does away with the need for high pressure selling. A rich field that is creating new money-making frontiers for widé-awake men. Those who enter now will pioneer—to them will go the choicest opportunities. EID, its INSTALLING NEW BUSINESS SPECIALTY 0 CASH SAVINGS FOR SHOUT THE U. S. AND CANADA bee 0s è j Brilliant Record of Success $4,707 Returns F n ` } As.well as~sélling thotisands of instllations’to small merchants, + Mg a pröřessiónal men, etc.. we numbep either the parent companies, or For One Kansas Store w branches, or. dealers, etc., of many world-famed concerns among our in Three Months customérs: Cities Servite OiT Co., National Majestic B dio, Chevrolet, | on 5 A Chrysler, Public Utilities Consolidated Corp., United Aluminum Corp., Sanders Ridgway, of Kansas, in- COMPLETE Y Street-Railw Advertising Co., Great, American Life Underwriters, yests 288.60 and shows returns of aE | res of others nationally known. Universities, newspapers. $4,707.00 between April 5th and TRAINING ; octors,, etc., buy substantial installations and heavy repeat orders ` P x : EATE | “FURNISHED f Customer Guaranteed Cash Profit — urns well over i $ (@ Customer gets signed certifieate guaranteeing cash profit on His investmen‘. Fox Ice and Coal | Many men with us Pal | Very few-business men are so'foolish as to turn down a proposition guat- a ie de ue PER day ‘started at s ich, “ anteed to pay a profits;with proof from leading concerns that it does pay. -00! Baltimore Sporting Goods 4 ý Store, invests $43, returns $1,- matty coming cat ofl í Portfolio of References from America’s 600.00! Pollom & Son, Indiana, i : ay $ ane | i 45 nee turned $15 a ation” clerking jobs, many out $ SAE, a Leading P oucerns j ` into $2,250.00 cash. $ | of small businesses, some | is furnished you. A fandsome, impressive portfoliothatrepresents évery With these and scores of similar | out fof large concerns. W leading type of pusiiess and protec nin: Pua a tanec posite P i 7S% OU z 3 $ Ti 7 proof of success. Le: el orestalls the arg nt, ‘“Doesn’ my roa ony Re we PoETO OVI a A business.’’ Shows that it does fit, and doesmake good. Closes the deal. y & E “wou the biggest Rush the Coupon for Full Information—Territory one can dispute the proof y H khe pusiness \ \ Filled in Order of Applicatior \ A 9 to-copies of actual Ag : ‘ki he coun- If you are looking for a man-size business, free from worries our men show. s'a ge Ring in AE of other overcrowded lines of work, get in touch with us at once. ness ABSOLUTELY Learn the possibilities now hefore the franchise for your eee Fe PRISKINGA AN territory is closed. This sbe@falty is as important a busi- A WRA a USS ING N ‘ ness opportunity today as the typewriter, adding machine, A an SIMPLY INSTALL— i RED COPPER CENT i dictaphone were in their early days. Don’t lose valu- | able time, and let this slip y from you. Use the 5 ` r OF YOUR OWN. & A a ee LET, if SELL ITSELF ` -Can't possibly tell you \A coupon for convenience. «> will bring you full in- Hore isia Business offering an invention so ` À all inthelimiteds pace 9 A formation and. our proposition immediately. successful that. we -make it sell itself. Our X pranonte here. ran i a ee ee ee ee ee e pe a e represeniatives simply tell what they offer, re coupon Now . ims shaw proof of success in every line of business full information— MAIL FOR FULL INFORMATION E a e aa nothing to risk, | F. E. ARMSTRONG, Pres., Dept. 4019-3, Mebife, Ala. f he specialty without a ar ‘down. starts verythi oe bert be E E A r na e e ev es ything to Without obligation to me, send me full afiemdtion on | be counted like the other cash register money. The : your proposition; P customer sees with his own eyes:a big, immediate z pront on his proposed investment. Usually he has the nvestment, and his profit besides, before the repre- sentative cee The representative calls back, collects «mm his money. >OUT OF EVERY $75 BUSINESS THE -

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Double Page Spreads

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fF Try Some of These Remarkable Seed Novelties WG JAPANESE ROSE BUSHES The Wonder of the World or eae S mill do weli boch im and sthesto gaa fem ac loe packet, 3 pats: lor 28 postpaid, Weather Plant cS trot pvtala GROUND ‘ALMONDS q ly Pralitio— Fasily Grown From Seed M Almond haa a avor that i MOST a ths ma inaaom White, covered with aehell ewe Brown olde. Tt groma gigne W tio suris sud ives fen Og Seka iba Gto SENSITIVE aR : “Calniash or "Pipe Gourds Eanna Banda 150 prt.. 3 prta. tok F0 S.C Mammoth Peanuts Peanvta can be easily cultivated, ‘Theis colture ts ory enple and exconainaly tatoreating. Marmot Fenta row to am atgm onime miro, difna good pron Rrowetly ib piraci, io, ang tho, Jonves, Being of z Kudzu Vine Most rapid growin Pme kuowa. WIN grow 20test inn nade purpose quici growth. Seece Toe pucks tar acer noon EIREFLY PLANT ot Tema Umbrella Palm Gremin ret Exaly Grown From Soed Winter or Summ Pa das orkan Faarene ue arabe bo ‘ FAMOUS MEXICAN FIREFLY PLANT eres a Asparagus Sprengeri Tes berpient me Ras Beatae foli ando shouid be grown "in every ora cross between eers gnd Cos ets fe? Piavorda nore mia thanany ook ice sags, nue oF gre toe Wettace or mal aeran iato satt, SURPRISE FLOWER GARDE SF Mixed Flower Seeds MANY RARE AND CURIOUS NOVELTIES aie, Wht sro Bretete for 48" l ee Address all orders to JOHNSON SMITH & CO., Dept. 717, RACINE, WIS. Send 10e for big 710 page novelty catalog REAL LIVE PET TURTLES Sent by Mail for Only; Interesting Pet Tiek a quarter aad wo BLANK CARTRIDGE PISTOL REVOLVER STYLE =~ 25c Egros new models pow out lade sand, efective? Mod- ef Latest Electric Telegraph Set BOYS! .rirgben tems 4 & c mena irii The Boy Electrician {ture Western lied it nent box ith fai ALL FOR battery) 10c ise (e postpaid igh 200) “SURPRISINGLY SIMPLE SYSTEM NG CARD, Nolacing fe cand uote ose" thes inde, W. is teune “afte Eth the dof plano keys), you co Ya Teren Inrentien ia oniy Ye postali BIG T ENTETAINEN FUN, MAGIC and MYSTERY IA JOHNSON SMITH & co.. a | LATEST FRENCH PHOTO | RING Hero 1s a ver great novelty R S San E E A icles ‘eitouy Being Inany way objcesoauie, PRICE "or $2.25 per doz. postpaid. "710 page Catalog 1 :| BOYS! THROW YOUR VOICE Toa trun unter ho bed or Sid meals E TSR o Š THE VENTRILO G a little instrument, fits in ‘the mouth out of sight. used. Yentriloguiin together “foe FUN, ‘MAGIC AND MYSTERY We also publish a monthly magazine of "AND MYSTERY. Each ‘a big collection of parlor Sue] manic, trick with cards, fortune-telling, funny’ readings, amusing experiments, parlor ine subscriptio or 3 years for 5: even coved thing up the ‘This as you y How to Pitch Real Curves Pitch the Fade-a-way, Spitter, Knuckler Smoke Balh ese, Letona by Ieading Big Eeague Pitchers: Clearly illustrated. and described wi Johnsons; Čo. Dep. 719 Racine Wis- ‘Address orders for all goods on above page to JOHNSON SMITH & CO., Dept. 7 19, Racine, Thank You for Men hanis and I le to Advertisers 2 Jor May When Wri

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“WILL theW ASHINGTON Cherry blossoms—and potential tragedy. Is the famous obelisk doomed by deterioration of inferior marble? Note the discolored base, showing area under observation. S THE Washington monument crum- bling? Are its marble sides deteriorat- ing to such an extent that visitors are en- dangered by falling stone? Is Ameri most famous memorial destined to come shing down upon the nation’s capital These disturbing questions confronted federal officials not long ago. A large num- ber of visitors had been waiting to enter the memorial when a missile suddenly hurtled downward, striking with a crash near the base of the structure and narrow- ly missing two people standing in line. A chunk of marble as big as the average man’s fist had chipped away from a sec- tion of the monument less than 150 feet from the ground! The narrowly averted tragedy galvan- ized government officials into action. Other fragments had fallen previously. The next missile might take its toll of human life. And always there was the whispered threat that perhaps the entire monument might come crashing down with untold disaster in its wake. A secret investigation was quickly launched to determine the causes of the memorial’s deterioration. An appropria- tion of $100,000 was rushed through by the Public Works Administration. Since then federal engineers and stone special- ists from the Bureau of Standards have 34 Secretly probing threatened destruc- tion of America’s famous memorial, federal experts unearthed a host of startling facts. Here, for the first time, is the amazing, inside story! A striking close- up near the base, showing how joints are chip- ping away thru improper stress. worked tirelessly, carrying on intensive tests which have revealed a host of start- ling facts. At first investigators were not sure whether the chipping away of the marble was caused by inferior quality of the stone, by the natural weathering process or by improper distribution of weight. Survey of the site revealed that the round top hill on which the monument stands is exceptionally windy, Like the famous Flatiron building in New York City, the shape of the memorial acts with the air currents to produce severe whirl- winds. Experts wondered whether the terrific lashing of these winds against the shaft would be sufficient to account for the deterioration. Seeking an answer to their questions, scientists first considered the history and the makeup of the monument. The face of the shaft is of marble while the interior facing is of granite, It is 555 fect one- ghth inches high, 55 fect one and a half inches wide at the base outside and 25 feet inside. The walls are 15 feet one- quarter inch thick at the base and 18 inches at the top. The taper of the shaft is one-fourth inch to one foot. The total weight of the monument is Modern Mechanix and eMONUMENT CRASH? by JAMES NEVIN MILLER 81,120 tons. There are 898 steps, 50 land- ings and 8 windows at the top. There an electric elevator with a carrying capa- city of 30 persons. The memorial was constructed to a height of about 153 feet by the Washing- ton Monument Society, organized October 31, 1833. The cornerstone, a block of marble weighing 24,500 pounds, was quar- ried and presented to the Society by Thomas Symington of Baltimore, Md. It was laid July 4, 1848, under the auspi of the society. After the memorial had reached the Alarmed by the disturbing reports, height mentioned, work was stopped for federal scientists plunged into in- lack of funds. No further construction {f2sijs,cxpstiments designed to fe- was accomplished for a period of 24 years Above, D. W. Kessler is shown when its completion was assumed by the Sbiecting blocks similar to ma- Government. Between 1876 and 1888 ap- test, Joints on the blocks were cut propriations were made for the purpose. Sik ,0RF and, onereisth ines: The monument was opened to the public per square inch before cracking- October 9, 1888. The investigators were not as interested in the monument’s history, however, as in 7 its construction. They knew that good 5 marble is durable, often lasting 200 years 2 or more. What, then, was the composition of the memorial’s stone? They found the answer in an ‘early report by the late (Continued on page 132) TEST SHOWING PAEROA og BASE OF WASHINGTON MONUMENT: Forced into the rubble section, water and com- pressed air escaped to the outer facing, proof of hollows in the ma- |E sonty of lower sections. | SARNE Marble not ideally suited for structural Purposes, according to experts, composes. the lower part of shaft, now crumbling. Inventions for May 35

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CRASHING AIRPLANES How filmdom’s aces brave death to provide thrills for picturegoers. ee ee Š Thrilling air maneuvers, as shown in back- ground, are first plotted on the blackboard. Freddio-Fleck, left, assistant n and Harry Peary, chief cameraman, ‘diagram the action for one of the sensational dog fights featured in “Hell’s Angels.” OTOR idling, prop turning over lazily; a pilot-less plane stands on the airport runway awaiting passengers. Suddenly the motor roars into life, the prop becomes a flashing circle of steel and the plane leaps down the field. A passenger has acciden- tally tripped the throttle and the ship is running wild! The staccato roar of a second plane fills the air. Another pilot guns his ship.to the full to head off the runaway. At mile-a- minute speed they hurtle toward other. A resounding crash and the two planes are locked in a splintering death embrace. Again two pilots have gambled with eternity to supply a movie thrill— and miraculously escaped. Oddly enough, the foregoing stunt, a scene from “Central Airport,” although con- fined entirely to the ground, was more hazardous than various breath-taking shots which are filmed in the air, One of the spectacular crashes which highlighted “The Lost Squadron,” for in- stance, was entirely devoid of personal danger, albeit thrilling in the extreme. The plot of the story called for the unnecessary death of a stunt flyer who was to-crash a plane in a village street immediately before the cameras. To accomplish the feat, a pilot-less plane was shot from a gigantic catapult to ils crashing point. The. only hitch in the proceedings occurred when a Needless risk of life is overcome ‘by this catapult which Jaunches_pilot-less planes down.a wooden. runway to their crashing point. (See photograph on opposite page.) 38 Modern. Mechanix and for the MOVIES PP JABS bowrES In crash sequences calling for closeups of the actors, planes are frequently strung on wires, a trick once used extensively to simulate collisions in early film production. slight directional error crashed the plane on a rooftop instead of in the street below. In these days of improved sound and pic- ture technique, head-on crashes into the ground are seldom attempted. Conversa- tion and closeups obviously cannot be satis- factorily recorded under such flight con- dilions. Dummy planes drop from inclined runways to provide the crashes while the closeups are filmed in the quiet of the barn-like sound stages. Despite the removal of some of the more obvious dangers of movie stunt flying, how- ever, improved picture technique has placed an even greater premium upon hair- line precision in the air. In the old days some of the daring fight sequences in mid- ir were enacted by miniature planes man- ipulated by wires; but today when you see several planes looping in formation and in- dulging in various aerobatics you may rest assured that dar- ing pilots actually went aloft and- performed the thrilling maneuvers in person, The customary procedure prior to the filming of a dog fight sequence is to plot the action in a chalk-talk session reminiscent of the football field. “This,” explains the chief pilot, drawing scrawls on the blackb: $ the dog fight action. Inventions for May Lost Squadron” without endangering life. came through a slight directional error when the plane crashed on the roof instead of in the street, before the cameras, as intended by the director, Not a new type of machine gun, but a late model movie camera, especially devised for the shooting of aerial scenes. “I'm going to give Jack the slow plane. Earl takes the red ship and follows Jack. TIl fly the gray plane and force Earl out from all angles. Let’s make it short and snappy—like a series of real crashes in the air.” Launched from, the catapult at left, this plane crashed spectacularly in “The The only miscarriage in plans 39

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Learn to Play BASEBALL Baseball is not just throwing and hitting a ball, Here stars tell you how a turn of the wrist or the grip on a bat put them into limelight on major league diamonds. by JOHN C. HOFFMAN TARS like Babe Ruth, Carl Hubbell, Al Simmons, and Ted Lyons did not walk into the baseball limelight through luck alone. They learned baseball by studying the stars of bygone days. If you want to be a good batter or a good pitcher, let the men at the top of the baseball ladder teach you. Baseball might be called a sport in which mechani important. We might talk about leverage, fulcrum, power, air resistance, and speed, but without getting too technical, let us put the spotlight on the pitcher’s grip on a ball, the batter’s grip on his bat or his stance at the plate. Let’s see what makes them go, so to speak. Let's see how they hit, throw curved balls, knuckle balls, screw balls and whatnot. We'll take some of the betler known pitchers first. Probably the five most popu- larly accepted deliveries are the curve ball, the knuckle ball, the fast ball, the Carl Hubbell, 1933 series hrero, pitching for the Giants. slow and the w ball, Some of the others are the fadeaway, the cross-fire, the fork ball and the downer. The possession of any or alt of these P TED ONS KNUCKLE BALL EE POTERE CURVE BALL EERE N THUMB ON SEAM 7 PNA ET BEFORE DELIVERY Pitchers’ grips fot some of the most popular forms of deliveries are illustrated here by Ted Lyons, White Sox ace. 44 Modern Mechanix and Babe Ruth, baseball’s great slugger, holds bis bat long. deliveries, however, does not make a great pitcher. A winning pitcher must, of course, have a change of pace, a deceptive delivery, intelligence, courage and last, but most important, control. The curve ball is most common and comes in a hundred varieties. Most of them are thrown by placing the first two fingers on the smooth surface of the ball and thumb on the seam. ‘This has a ten- dency to slightly retard the progress of one side of the ball while the side under the first two fingers is sliding, thus affect- ing a spin and the consequent curve. Throwing the Knuckle Ball The slow ball is generally gripped by all five fingers, At the instant of its deliv- ery all five fingers are opened simultane- ously so as not to put a spin on the ball. Approaching the batter, the ball thus ap- pears larger and has a tendency to throw the hitter off his stride. The knuckle ball is a widely used deliv ery, but difficult to control. In the major- ity of cases the ball is held with the thumb and the little finger against the ball and the other three fingers crooked, with the first joints resting against the surface. Inventions for May rom “BIG LEAGUE Stars Ty Cobb, master batter, Was not at orthodox hitter, He held his bat short and kept his hands apart to be ready to bunt or place hit any pitch coming ever plate, ce AB, UAT THE PITCH TANO D Various stances at the plate used by great hitters are shown above. Hornsby’s and Groh’s are most unorthodox. A notable exception to the custom, how- ever, is Ted Lyons, Chicago White So ace, who places the tips of four finger- nails on the leather with the thumb pressed on the ball as in the case of the curve ball delivery. This would seem to make it more diffi- cult than ever to control the ball, but not so with Lyons. Explaining his’ knuckle ball, he says: “I find that I can get more of a break on the ball by gripping it with four finger- nails. It took years to develop this deliv- ery. I first experimented with the knuckle ball while still at Baylor University. I had (Continued on page 135) 45

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“Daring “Rocket Men to Invade Experimenting with giant rockets, dauntless scientists are planning fresh invasions of the ether. Here is a complete story of their latest projects. Success of the rocket-driven auto, left, paved the way for conquest of the’ ether. HE rocket-shooters are going to pitch in again this coming summer. Undaunted by reverses and tragedies during the past year’s experiments, the rocketeers are tack- ling their work with renewed vigor and ambition, plus improved apparatus and Fanable ofboth chemicals. vertical Wight, Ernst Loebell, famous German engineer hienas and rocket designer, promises to bring the turns to the rocket engines lo their greatest point of aa achievement next summer. He is now in this country and is an active worker in the Cleveland Rocket Societ Loebell has been carrying on his pre- liminary experiments on the big Hanna estate in a suburb of Cleveland. In their cperations the Cleveland group has been making use of the Jessons taught by the ex- periments of Loebell’s countryman, the late Reinhold Tilling, a noted radio engineer and rocket builder. Prior to his death, Tilling had been ex- perimenting with rockets and rocket planes for months. The success of a rocket which reached a height of 6,000 feet in 1931 spurred him on to the construction of a rocket with glider wings which unfolded when the fuel was exhausted and brought the projectile gently to earth, This feat was hailed as one of the first practical steps to- ward the development of mail and passen- ger carrying rockets. The Tilling rockets were set in motion by lelignilion from a distance of 100 yards. They attained a speed of 700 miles an hour and landed five miles from the starting point, in accordance with calculations. Herr Tilling was working on a system de- signed to manipulate his rockets by radio control when he and a female assistant were killed in the explosion of a rocket which they were charging. Such information as emanated from the Penetration of the stratosphere to a depth of fifteen miles is planned by the Cleveland Rocket Society, here shown conducting a successful test of a new rocket motor. the STRATOSPHERE > “sisstt fee — AE SNE Y BY FREE An artist’s conception of the man-carrying rocket of the future. Note autogyro vanes which float the rocket back to earth when power is spent, allowing it to settle gently on landing fins. Society’s guiding geniuses. They plan to adopt the Tilling heritage and carry his work to further perfection. Ernst Loebell and his assistant, Ted Hanna, have also investigated another secret German rocket—that of the famous Fischer brothers, details of which have also been closely guarded. The Fischers have achieved the biggest advance thus far in the field of passenger rocket flying. The Fischers pursued their experiments on the island of Rugen in the Baltic Sea under the auspices of the German War Ministry. Otto Fischer, brother of Bruno, who designed the rocket, was shot up 32,- 000 feet, more than six miles, into the air in a 24-foot steel projectile. FOLDED LANDING LEGS ACT AS GUIDES The model motor consists only of a combustion chamber. A highly volatile gas combination is fed through two tubes in the nose. Oxygen is poured through one inlet and gasoline under 250 pounds pressure through the other. 50 secrecy surrounding Tilling’s operations at Osnarbrueck, Germany, has since been in the possession of the Cleveland Rocket Modern Mechanix and At the peak of the rocket’s trajectory, Otto released a parachute attached to the (Continued on page 118) Inventions for May 51

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Study y Cl ouds to FORECAST | Predicting weather is not at all hard if one watches Mother Nature’sweather signals, The clouds, the sun, the air, the wind, even the moon and stars have stories to tell if one watches them carefully. White, fleecy cumulus clouds, casting no shadows, with blue sky visible between the patches, mean fine weather. When seen near the horizon, as above, they are somewhat flattened. E HAVE all, at some time or other, taken a turn at predicting tomorrow’s weather, with varying successes. We have marveled at mariners, farmers, or woods- men who become quite expert at forecast- ing weather, and wondered how they did it. It is the simple weather signs for which these amateur prophets look, signs which can be interpreted by anyone. Only these obvious indications will therefore be dis- cussed here. his article, of course, cannot make you an infallible weather prophet — nothing can be so fickle as the weather. With all the latest scientific equipment at its dis- posal, the Weather Bureau is only 85 per cent correct, and it figures it is doing right well at that. Four Types of Clouds Clouds are ihe most obvious weather signs and are easily read when one learns their language. There are four major clas- sifications of clouds — cirrus, cumulus, stratus and nimbus—with 27 combinations of these types. Cirrus -clouds are feather- like, cumulus clouds resemble a wad of cotton, stratus clouds come in layers, and nimbus clouds are of no special shape but merely those from which rain or snow is actually falling, although sometimes the precipitation evaporates before it reaches the ground. Keeping these descriptions in mind, and referring to the photos shown here, it should be simple to identify the various types. Everyone has noticed droplets condense on the outside of a pitcher of ice water. 62 Mares’ Tails” cirrus cloud photograph taken before storm came, These are bigh and feathery- Below: Rainbows are of value only in predicting weather for the same day, If in afternoon, they mean fair weather. The same thing occurs when a cloud is formed—the moisture in the air is con- densed when the air becomes cool enough, and these tiny drops become visible as clouds. Since clouds are evidence of mois- ture in the air, a cloudless sky is a sure sign of fair weather. Small scattered cumulus clouds also de- note fair weather. These clouds are white and fleecy, and when seen near the hori- zon they are plainly somewhat flattened. Sometimes they appear as large patches Modern Mechanix and by DR. W. J. HUMPHREYS IER” U. S. Weather Bureau Washington, D. C. lackerel Sky” cirrus clouds, and similar feathery for- ions, forecast a storm which may be several days away. They indicate high winds, probably accompanied by "eis: of stratocumulus, but if they are soft and woolly, casting no shadows, and with the blue sky visible between the patches, they still mean fair weather. High feathery clouds are usually the forerunner of a storm, although the storm may be several days away. These cirrus clouds often take the form of “mackerel scales and mares’ tails,” and indicate high winds, which will probably be accom- May Inventions. for Large cumulus clouds indicate showers. When anvil-shaped mass shown above appears above the towering cumulo- nimbus cloud formation, bail or thunderstorms are probable. panied by rain. Often two layers of clouds may be seen moving in diferent direc- tions—a sure sign of a rapidly approach- ing storm. While small cumulus clouds mean fair weather, large clouds of the same type indicate rain, usually showers. Often bil- lowy white clouds may be seen on the horizon, the tops towering to enormous heights. These are caused by rising cur- rents of air—a condition necessary for thunder storms. vil-shaped mass appears above these towering cumu- lus clouds conditions are ripe for a hail storm. Clouds May Resemble Waves Occasionally cumulus clouds take the form of a wave breaking on the sea shore, forming a long line that seems to be rolled along. This is known as a line squall. It indicates the meeting of winds from op- posite directions, causing strong ascend- ing and descending air currents, and will invariably be accompanied by violent showers, high winds, and a considerable drop in temperature. Dark, low, ragged clouds indicate bad weather, usually a long period of steady rain. This type is known as nimbus, and is usually without any definile shape. Of- ten such clouds will be present a long time before rain actually starts to fall, or the rain may cease though the shapeless s of cloud persists for some time. (Continned on page 120) 63

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WHAT'S “WRONG “With by Lieut. John Edwin Hogg, U.S.N.R. Lieutenant John Edwin Hogg, U.S.N.R., author of this article, has just completed a tour of duty with the fleet in Pacific waters and the facts he learned are well told.’ He backs up his “bigger Navy” plea with concrete reasoning. Aerial view of sub- marine mother ship, “Holland,” with subs alongside. Of the 11 submarines shown in photo, only one, the “Bass,” the large ves- gel moored to the star- land,” is semi-mod- ern, Others are obso- lete world war types. (Nore: The views and opinions expressed herein are those of the author and should not be construed as reflecting the official views or opinions of the Navy Depart- ment.) lines are written the Ameri- is in the worst condition of decrepitude and impotence that has ever marked its history. Pacifist domination and sheer neglect has left us with a navy so skeletonized and anaemic as to threaten our national secur- ity. Among some none-too-friendly neigh- bor nations armed. to the teeth and in a world seething with social, political, and economic unrest, we find ourselves with a run-down battle fleet that is only 65 per cent of the estimated strength necessary for national defense. Moreover, this pre- cariously weakened “first line of national defense” is only 85 per cent manned! The Roosevelt administration is striving desperately “to do something about it.” Recently congress fired a heartening broad- side by assuring appropriations for new ships that will bring the U. S. Navy up to full treaty strength. Into these vessels will go improvements in design, speed, gunfire and cruising range developed since the World War. In the air the navy will aug- ment both its offense and defense. A third aircraft carrier, floating a new swarm of planes plus large caliber anti-aircraft UNCLE SAM’S NAVY? A naval officer frankly discloses just how badly American defense has suffered through inadequate building program. weapons and new machine guns will fur- ther bolster the defense. The close of the World War found the leading nations financially impoverished, sick of war, and plunged into a new com- petitive race of armament building. This country made an honest and sincere effort to influence the other nations to make drastic reductions in both military and naval armament. To that end we called the Washington Naval Conference of 1922. So enthusiastically did we, plunge into that conference that in the words of the late Admiral William A. Moffett, who went to his death in the wreck of the airship Akron, “Uncle Sam lost everything but his shirt tails when he signed the Washington Treaty.” As a gesture of our peaceful intentions toward Japan and other nations of the Here's Strength Allowed by Treaties U.S. Bs Japan T Tonnage 315,000 81,000 108,400 Type of Ship Capital ship: Aircraft Cai Cruisers “AV 180,000 146,800 8. Cruisers “B” . imited to . guns) Destroyers Submarines 143,500 192,200 100,450 150,000 52,700 159,000 52,700 1,186,200 1,201,700 _ The frontline of defense. The bat tleships “Texa: and “Idaho” in majestic parade. We need more of these, U. S. navy experts claim. Scores of costly destroyers rusting and rotting at San Diego Naval Base. Allowed to go to ruin, these boats could not be put into condi- tion without huge expenditures. 70 Modern Mechanix and Inventions for May 7L

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pR General and Mrs, Cornelius Vanderbilt go strolling down Fifth avenue on a joyous Sunday morning. Not far behind you will note a husky bodyguard. John D. Rockefeller, Je (carrying valise), travels a good deal, but never without a physically competent and alert bodyguard. ‘The bodyguard, as shown in this picture, constantly keeps an eye trained on all those nearby, 80 i eee = = os : Í A eee “Bodyguards Gace “DEATH Here's the boy who, started the bodyguard industry on its Mago, but now of Adanta, enjoying a ball game. Beside Bim is bis son, Al, Je- The ball player is Gabby Hartnett. Some of the men behiad Capone ‘are his personal bodyguards. Henry Ford shows Prince Nicholas, of Rumania, what makes it run. But in the background are the ever present bodyguards, The two in dark clothes watch the Prince, while the one on the right shadows Ford wherever he goes. N THE ordinary run of things, a man does not go about looking for trouble. But this is not the case with a new type of professional men. They are called bodyguards. Trouble is their business- and death not infrequently is their reward. A bodyguard—and there are thousands of them employed throughout the country to- day, since the growth of kidnaping and the advent of gang terrorism—must be ever on the alert to forestall tragedy. He must grap- ple with cranks, fend off kidnapers, shoot it out with a would-be assassin—even offer his own body as a target in order to protect the man or woman under his care. Perhaps you recall the attempt to assas- sinate President Roosevelt in Miami, Flori- da. You will also remember that within a few seconds after the shots were fired, the Modern.Mechanix and to End KIDNAP MENACE by HARRY BERNSTEIN Unique and dangerous profession springs into being as the rich seek Protection against gangsters. Per- sonal guards must be capable of put- ting up battle or sipping tea in fash- ionable drawing rooms of social elite. President Roosevelt is under constant watch by an entire squad of secret service operatives. But he also bas his personal bodyguard, shown at right. LSS Great Britain takes necessary measures to protect its prime minister, J. Ramsay MacDonald. Leaving St. James Palace, Premier MacDonald is trailed by a corps of bodyguards. President found himself surrounded by a wall of human protection. Any more bul- lets would have had to drill through some faithful guard before reaching the chief executive. A few years ago, the President of the United States and certain very high gov- ernmental officials were the only ones who enjoyed the company of bodyguards. But such is the pathway of modern civilization that today almost every man of wealth or political importance feels unsafe unless his very tracks are dogged by a faithful and physically powerful servant. The personal bodyguard is a direct product of the era of gangland. Big shots of the underworld, like Al Capone, started the fad as a means of self protection against rivals, Then, when the gangsters turned to the lucrative pastime of kidnaping wealthy Children of wealthy persons are under heavy guard these men and women and holding them for days, due to the many kidnaping attempts that have Tansom, the employment ef bodyguards been made in recent years. The baby son of Samuel Insull, 7 9 Ju, is never permitted to leave the house unle: is nurse (Continued on page 120) is accompanied by a bodyguard, as shown ia this picture. Inventions for May gt

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Gimely ‘GIPS Squeaks and rattles in the docrs disappear when pieces of inner tube rubber are cemented aver the old rubber door buffers. Upper right—Tightening body bolts in chassis. by F. H. MONSO PRING is the time to tune up the old bus and gel it ready for a summer of plea- sure. Winter is so hard on any automobile, that a spring overhauling is a necessity. There are a number of things that you can do about your car lo provide more comfort, safety and freedom from break down. Perhaps the first object of attention should be the moto: distributor are pitted, remove them and dress their faces on an oil stone until clean, If they capnot be cleaned properly it is wise to replace them with new ones. Distributer Point Clearance After installation, space them to the prop- er clearance, as specified by the manufac- turer of your car, This clearance is usually about 18/1000 of an inch, or about the thick- ness of the wire in an ordinary paper clip. See that the distributor cap is clean and free of cracks. Inspect the spark-plug wires, and if they are cracked or oil-soaked, replace them; the best plug in the world will not fire properly unless the wires feed- 84 If the points in the , for (@UNING the old bus is ready for spring driving. A coat of standard auto wax rubbed into the finish after mud has been washed off will greatly improve appearance. ing it are in good order. Remove the spark plugs and clean them. Most cars require a spacing of 25/1000 inch of the spark plug points. It is important, for good idle and high speed, that the plugs are set carefully and uniform. If the generator commutator is dirty, Modern Mechanix and Tune up the motor, tighten loose frame bolts, clean off the winter’s mud, and UP YOUR (AR Ghis Spring When pedals become tooslip: pery, clean with f gasoline andap- |1 ply a fow coats of ‘ordinary | rubber cement | Spring shackle bolts determine to great extent riding quali- ties of car. They should be gteased, and not too tight. élean with sandpaper, using a light pres- sure, while the motor is running. Never use emery cloth for this operation. It is best to put the sandpaper on a stick to prevent clipping the fingers. Readjust the charging rate to about 10 to 12 amperes, which should be enough for warm weather driving. Most generators are adjustable in the third brush —the narrowest of the three—which is Yocked by a screw on the back plate of the generator. Moving this brush in the direc- tion of the rotation of the armature increas- es the charging rate. Inventions for May Clean cunning board, fasten down new mat with rubber cement, pile on sand to press mat firmly down at all points. Afler you have drained the anti-freeze from your radiator, flush the system with clean water, tighten the water-pump pack- ing nut just tight enough to prevent leak- age, and refill. If it is necessary to flush the radiator with a cleaner it may be done with a sal-soda solution. Never use a flushing compound if your car has an aluminum cylinder head. In this case the radiator must be removed and cleaned separately from the block. Check Electrical Connections After you have done all the above work it is wise to tighten all electri tions on the car—on the d coil, lights, distributor, generator, starter and baltery. Clean the top of the batlery with a solution of household soda and water -then flush off with water. This removes all acid and prevents corrosion, Tf you will now grease and lubricate your car carefully, from front to back, you are ready to tackle the job of squeak and rattle hunting. Tighten all body bolts. These bolts hold the body to the frame, and are located, four to six in number, on each side of the frame. The nuts are tightened from the bottom, against the frame. Almost any car over a year old will de- velop a cracking or squeaking noise in the (Continued on page 118) 85

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Robert Page Lincoln, the author, roams frora Canada to Florida seek- ing new experiences as a hunter, fisherman and camper. Here he is testing in the North DAN BEARD PATTERN: ‘The Dan Beard pattern, above, in many ways is the ideal light tent. Fires can be built in front of it to throw heat into the in- terior of the tent on cold days. PEAK HELO BY SHEAR POLES Loy ere ger ee SADERAUES S| ‘The popular Canoe Tent has many advantazes. t can be made any size desired following gen- eral outlines shown above. tion, are described in the text. Shear poles are used on open ground and in storms to avoid il lightning under trees hitting occupants of tent. by ROBERT PAGE LINCOLN Hunting and Wishing Editor N MANY ways the little shelter tent, in any one of many designs and patterns, cut and slant, is the most interesting of the canvas roofs open to the purchase of the camping enthusiast. ‘There are those who look upon these tiny tents as suitable for children only, forgetling thal the go-light camper, who carries his “all” on his back in a pack-sack, the canoeist, the mountain wanderer and over-night camper who docs not wish to be burdened down with a. more commodious affair, selects the shelter tent. The shelter tent cuts down space to a minimum, and, on the average, is a sleeping tent, no more no less. Among the shelter tent patterns the so- called army or pup tent is the most common and, on the whole, the least attractive. It is merely a modification of what is known as the wedge or A-tent with a rear extension added to make it a trifle more roomy than it otherwise would be. PEAR HELD BY TREE LIMB ~a Steps in construc- Modern Mechanix and 1% HARNESS RING This tent, designed by Robert Page Lincoln, is roomy and rain proof and can be made easily. Openings in the flap and ‘Tear provide ventilation on sultry summer evenings. The pup-tent can be made more roomy by simply adding a one foot high wall can- yas all around its sides and back, thus rais- ing it up off of the ground. This will pro- vide considerable more space within. This wall canvas need be only waterproofed muslin or lightest canvas. H this wall can- vas is added the tent will need to be erected with a ridge pole and guyed out af the sides. The Cruiser’s separable tent, as shown in the illustration, is an example of a very simple and practical shelter tent that any- one can make. It comes in two sections, each section making a half-tent with an open front. A sort of hood of canvas caps the two sections when they are joined at the. peak, the same turning ‘any rain that falls, This ewed to one side of the peak ef one section, laps over and is tied with cords to other cords attached to the second section. Inventions for May ‘The Lincoln model tent in actual use. Note that the s held up by shear poles. The tent is five feet high. ight tents can be simply lined out with cord: CRUISERS SEPARABLE TEN 70 HALVES JOINED. WITH. RIDGE HOOD, ‘The Cruiser’s Scparable and Wedge Tents are ameng the simplest of fight tent designs described in the text. To reinforce the ridge or peak a rope of about the size and variety of a window sash cord is sewed in, to which the ridge rings or canvas loops that connect to the ridge pole are sewed. The second half of this type of tent has its peak canvas buttoned to the ridge of the other half, the peak hood over- lapping the buttoned section thus protect- ing it from the rain. The wedge or A-tent is, of course, merely a typical ridge tent, sewed together at the peak as most tents are. It is probably the most simple tent of all to make. This tent, too, has the rope sewed into the inside of its ridge to support the same, and give bear- ing to the canvas loops that are slipped over the ridge pole The Dan Beard pattern of tent is another (Continued on page 130)

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naira wo Aa area E RAA a i alee ae lt ‘The heavy reel and cod, ri will successfully land deep sea huskies. This deep fake and salt water rod has an alu- minum reel plus a spe- cial chuck joint ena- bling use of various length tips. Above, new minnow-type lure. Note swimming ac- tion in water, below. An all-aluminum tackle box, left. Note handy tray action. |, Above, indoor target, featur. | ing centrifugal bul- let trap device. Deer hair spinner, warranted weedless. Special tackle kit, left, may be used for both fly fishing and bait casting. AKING up the challenge of the “big ones” that got Ø away last summer, tackle de- signers have concentrated upon even- ing the odds in the 1934 battle with the finny tribes. The weight of deep sea rods has been lightened with sturdy aluminum reels. Tackle boxes have likewise been made lighter and more compact. Weedless, life-like lures have been de- signed to inveigle the wiliest bass from the depths of his shadowy pool. Nor have the rifle and pistol fans been forgotten. A new indoor target embodies a centrifugal bullet trap which will stop anything from the .22 pellets to the heavy .45 pistol slugs. Modern Mechanix and Train Your Hunting Dog for Field Work on Game Now ATIENCE, kindness, and time are the main essentials in training dogs for hunting game. Most handlers start training pointers, setters, spaniels and retrievers at six months. By the time the puppy is ten months old he is usually ready for the field. You can not break a dog of gunshyness by firing a gun over head or directly at him. The easiest way is to take a gun of small caliber and have someone fire it at some distance from the dog while you pat the animal’s head to quiet him, Gradually decrease the distance until the dog shows no sign of fright. Then follow the same procedure with a regular bunting gun. Finally Iet the dog loose. Retrieving, natural to all hunting dogs, ae All hunting dogs love “the chases || Here is a chams jon orange and hite pointer hurdling a fence at field trials. |% Training dogs for the field usually | starts at 6 months. Inventions for May is best begun in the yard with a check-cord. The dog must learn to stop on command; drop down where he is on command; and “fetch” when told to do so. Hold a long cord passing through a ring on a stake in the ground and attached to achoke collar. Hold the dog near the stake, get some distance away and then attract his attention. After he moves a few paces toward you, call “stop” and check him with the cord, After a few days walk toward him, check- ing him if he moves. Then walk past him and eventually you will be able to check him without the cord. A dog will easily pick up field work if permitted to work with an older trained dog. Preliminary retrieving can be taught in the yard: Get him to open his mouth and say “fetch” as you push an object into it, Be sure that he does not drop the object until you say “give.” Puppies learn best when accompanied by an older dog. Here 2 puppies are watching their moth- ing in a pigeo!

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“Ftow to RESTRING Your z Save up to $5 by restringing your tennis racquets at home. The process is very simple, requiring only a bit of muscle and a few easily obtained tools. by WILLIAM E. MAHER n CARRIAGE. ae apove RACQUET MOUNTED READY TO ee F WAIL \ Wi ya DETAIL OF VISE ASSEMBLY Felt lined vise to hold racquet handle can be made as shown above from blocks of wood, a thumb screw, and a hinge. Head clamp is made from pieces of strap icon. quets by following these simple instruc- tions. The process is not complicated, and is extremely fascinating. The whole job will take only about 1% hours, and will save the restringer up to five dollars. No experience or expensive equipment is needed. The tools required are: a vise, four ice-picks or restringers’ awls, a pair of pliers (if possible, a pair with parallel acting jaws) and a round wooden dowel about an inch and a half in diameter and eight inches long, wrapped with friction tape. OF course, the most important requisite is the gut-used in restringing the racquet. START OF VERTICAL, STRINGS ON FRAME ŽO MAN STANGS mm If racquet has 18 vertical strings, start them as : in Fig. 4; if 16 or 20, begin at throat as in Fig. 5. Thread alt vertical strings in loosely before beginning to tighten. OW that short working hours are here for everybody, tennis is becoming more Own TENNIS RACQUET Fig. 6 shows threading scheme for racquet have ing open throat. In Fig. 7 all but outside vertical strings have been tightened. Awl is moved from A to B, slack in outside string is taken up. the silk will range between 70c and $3.00 and the gut, between $1.25 and 86.00. The cheapest silk string is much to be pre- ferred to the cheaper gut strings. A list of firms selling tennis gut in small quantities will be sent free to those en- closing a stamped envelope, Address Mov- ERN MECHANIX AND INVENTIONS, 529 So. 7th St., Minneapolis, Minn. Thirty-six feet of string, preferably in the 15-gauge thickness, ure required to string a racquet. Nineteen feet of this is used for the vertical strings, and the re- mainder for the cross or horizontal strings. Before restringing, any frame holes that are rough or jagged should be reamed out with an ice-pick, The equipment needed to hold the racquet must next be prepared. The vise (any small vise) should be fastened to a heavy plank about 12 inches wide and a little longer than the racquet. The plank must be fastened to a firm support. If the reader intends to string a number of racquets he should make a head-clamp. This will be mounted at the end of the plank to hold the head of the racquet in place. When the wing nuts are tightened, the racquet will be held firmly, and any possible warping of the frame will be prevented. wood clamp popular than ever with thousands and thou- sands of sports enthusiasts. Amateur as well as professional tennis players can easily restring their own rac- 100 It is made either of silk or sheeps gut. Of the two, the former is the cheaper, the easier to work with, and the most wear- able. However, it docs not possess quite the liveliness of sheeps gut. The price of Modern Mechanix and casier to ma but because o necessarily larg- (Cont. on p. 122) © Figs. 9 and 10 show beginning of cross strings. Tie knot at fourth vertical string from two center strings. For rapid weaving of cross strings, pull through half way at time. Seeing is wrapped around wood dowel for firm grip when tightening. Broken strings ate easily repaired as shown in Fig. 12. Trimming cord may be used at top and bottom to improve appearancé. ATTACHING TOP ® TRIMMING CORD = ATTACH ——TRMM Inventions for May $ 101

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e-o” TAPERED BEAM SCALE WW FEET 207- 27 OLD FIRE TRUCK WHEELS 48” DIAM. Ly , T gy 5 8 a2 x $ 5& l š 4 l gg 2 i| z EE aaa eu 32, \ile 22 2S Wr] he Ba U ‘Upper left: Completed suspension boat trailer is very light, and easily pushed along beach, Hookup is held by man. 104 Boats weighing up to 600 pounds can be launched or taken out of water in 10 seconds with this easily built suspension trailer. Tremend- ous leverage of beam allows a man to raise a heavy boat into position. Coast Guard men drag boat trailer along beach with ordinary car, run trailer into water by band, and launch it in less than ten seconds. A 20-ft. Coast Guard boat suspended from the trailer. Steel cable carries most of 600-ib. load, permitting small beam- A CALL comes in to life guard headauar- ters that a small boat is in distress off some lonely spot on the sea beach. Lives are in danger, and every second counts. A seaworthy patrol boat must be picked up on a carrier on a moment’s notice, towed by automobile to a point on the beach near the scene of the accident, and hurriedly launched in the surf. George Watkins, chief of the Santa Monica, California, Life Guard Service, solved this problem by designing the sus- pension boat trailer. With it a 20-foot dory or skiff weighing more than 600 pounds can be lifted from the ground or shallow water into carrying position in less than 10 sec- onds by ONE man! The launching of a boat requires even less time. The suspension boat trailer is, primarily, a long, reinforced wood beam, fixed upon a steel axle which has been raised sufficient- ly high above the wheel hubs to clear the ends and freeboard of the craft to be car- Modern Mechanix and for Your Boat A rx w. ee STEELHOOK | F HARDwooD eee rixen t MAY BE USED HOWEVER STEEL Gee Pyoro apove) Close-up view showing steel framework of trailer. Frame: work is padded to prevent boat from being scratched. Fire engine wheels are used here, but large auto wheels will do. ried. The rig is simply rolled above the boat, and a fixed hook at the rear extremity of the beam is joined fo a steel ring or loop of heavy line attached to the stern of the craft. The leverage of the beam makes it practical for a man of average weight to raise the stern of the boat, Then a movable forward hook is readily fastened to a ring in the bow, and the lift has been accom- plished in a very few seconds. Lines dropped from the axle are tied to the gunnels to snub side motion. The weight is so balanced that a single man can raise the May Inventions for RING BOLT—a CABLE CLAMP CABLE e A mead STEADYING ROPE 7 STRAP ON | SS f GEE puoro SELON) by GARTNER ify, 2 srr inom ross KA Pre ma o ae 7 MOVEABLE HOOK ALI" ANGLE IRON BRACE ‘ Af WELDED JOINT TO A UPRIGHT HOOKUP ar steer axe 1s A MADE WIDE ENOUGH YO ACCOMMODATE BEAM oF BOAT ITs 4! INTENDED TO ER STEADYING. ROP E STEEL STRAP 37 WIDE x 5 6" socTS a” STEEL HEAVY STEEL DETAIL oF TRAILER HOOKUP AND MOVEABLE FRONT HOOK E WELD DETAIL OF ë & J AXLE AND zj STRAP BRACE 2" STRAPS IRon & Pe RING BOLT woop FILLE! R [ON TOPON) WELD- WY Another view of trailer frame, showing bow steel braces from beam to axle add rigidity to the suspension assembly. hos forward end when hooking the trailer to an automobile, Since this carrier was designed to accom- (Continued on page 124) 105

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Entertain Friends with hese “Pseudo-Occult Magic Tricks

on paper over, plate glass spells out “spirit” messages ina mystifying “manner.

by DICK COLE YONE can display “supernatural” powers before a group of friends, put on a pseudo-occult demonstration which defies all natural laws, and call upon the “spirits” for advice and mystic messages. In calling for spirit messages, the room is darkened, with only a weird blue light to cast grotesque shadows. Trick Is Simple Tn the center of the table is a sheet of paper over a square of plate glass, with a black steel ball resting on one corner. Monotonously chanting mystic unintel- ligible words, the “medium” demands a message of the spirits, in answer to a qu from someone in the audience. As the spectators watch the ball, it qi trail in its The trail forms letters—words—a

wake! message on the smooth glass! The secret is this. First of all, the ap- parently solid steel ball is hollow. It is coated with lamp-black, which forms the trail of black on the glass. Beneath the table is a powerful perma- nent or electro-magnet, supported by a pan- 110

Ee 7 Le — PAINT CARBBOARD WITH SOD! <” SALICYLATE (DIP HANDS IN RON AMMONIUM: (SULPHATE Performer washes hands in seemingly clear water, presses one hand on ordinary white cardboard, and bloody red Imprint of human hand is immediately formed on cardboard. tograph arm which extends back through a hole in the curtain to the pantograph as- sembly on another table. A confederate writes out the messages with the tracing point of the pantograph, and the moving magnet pulls the hollow stcel ball around on the glass. Ordinary wood laths can be used for the pantograph arms, the distances being casily determined for the desired size of writing after a few trial settings of the arms A popular East Indian Yogi trick is the “Hand of Blood.” ‘To prepare for this, paint or spray a piece of cardboard or cloth with a solution of sodium salicylate. Prepare a solution of iron-ammonium-sulphate, Show the cardboard to the audience to Modern Mechanix and

Sy CEEE CORD PASSES UNDER FLOOR

T0 RECEIVER LIDER Ca 30 ENAMEL WIRE hs CIRCUIT

‘Wireless tetephone for conversing with “spirits” is not at a!l mystifying to a radio fan. Crystal set, connected to receiver, is concealed in base of phone, using circuit shewn above. prove it has not been colored beforehand. Clean your hands of dirt by washing in the clear sulphate solution, and press one hand carefully on the cardboard. The chemical on the hand, coming in con- tact with the treated cardboard, produces a deep red stain-—an impression of a bloody human hand! “Ectoplastic magnetism” can be demon- strated in a slightly darkened room, A shiny, chromium-plated ball about eight Inventions for May

Author of this article demonstrates Vectoplastic magnetism” by making massive steel ball climb, up string in defiance of gravity. Sketches at left show how it is done. feaStae Pulls gently on lover cord to make bal’ chistes. inches in diameter is threaded on a cord extending from ceiling to floor. The ball rests on the floor, but is free to slide up and down the string. The “medium” stoops and places her hands about six inches above the ball. Slowly raising her hands, the ball climbs up the cord in defiance of gravity. Ball Is Hollow The mystic ball, seemingly of massive steel, is really a metal shell. The cord does not pass through the ball; each end is wound on a drum turning on a cross-shaft within. The drums are of different sizes, the lower cord winding on the larger drum. The small leverage obtained here is suffi- cient to make the ball climb when the lower cord is pulled. This cord passes through a dummy knot on the hollow screw-eye, down through the floor to a remote point where a peeping confederate moves the ball in unison with the operator’s hands. “Spirit messages” can be received over an ordinary telephone entirely disconnect- ed from the line. A miniature crystal set, built into the body of the wireless tele- phone, is connected to the receiver. The transmitter is located in another part of the house, and the sending aerial run up through the floor to the table. A microphone concealed in a vase of flow- ers picks up the words spoken into the telephone and brings them to the “spirit.” 111

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Model of the First Typewriter An IMPROVEMENT Improved Typewriter The Difference Between “Improvement” and “Invention” Very few inventions are entirely original. When a friend says of your inventive idea, “Oh, I'm sure something like that has been patented already,” the chances are that it has, But your idea may have certain differences or improvements that earn its right to patent protection. The first step is to determine, through patent office search, if there are exist- ing patents that bear on your idea, Clarence A. TH E FIRST STEP ave an experienced Patent orney to look after your interests at Washington. It is not the part of wisdom to put-off or delay. And remember—U. S. Patent protecti the only way to ob: tain the exclusive right to manufacture, use, or sell your invention. Importance of the “Search” I can help you immediately. My offices are in Washington. Send your idea to me in rough form. My experienced examiners will make a search through the Patent Office to see if your invention has been anticipated. I can give you a report at once—and this is something you must have, because it decides what future steps you should take. Drawings Don’t spend money or time on finished model: idea may be patentable. My large staff of experienced patent searchers can handle a search from your description and rough- est sketch. The main thing is to put it in my hands as promptly as possible. Facts About My Service Tam a registered U. S, Patent and Trade- Mark Attorney, g inventors all over e United Si My organization is complete in every particular. I have raughtsmen, Experienced Searchers, and Attorneys to s i ears of experience in patent and know every angle of legal I will secure protection for a if it can be done! But the longer you delay—the harder it may be for me to serve you. Reasonabie Fe Easy Terms Don't worry about finances. My fees are reasonable—and I can arrange convenient terms o: ient. It has always been my OR: ien 317-F ADAMS BUILDING SHINGTON. D. C. custont to permit my clients io pay fer their appli- cation in installments as the preparation of the application progresses in my office Send for Free Bock In order to know the steps necessary in securing a patent, send for m: BOOK, “How to Obtain a Paten book tells you everything tha done every step of the way Patent Laws protect you, what ney does for you, et Also FREE RECORD of UERN INVENTIO 48 you préter’to tse a fora cially for the purpose of re- cording the deseriptive out- line of your invention for R S. Patent Office, write to- day for my Record of In- vention form—it will guide and assist you. It enables you to make a sketch of Jour ea ard have ie wile nessed in a manner of value toyouasevidence should the oi sion for evidence arise. REE BOOK tells you how to use this form to pro- tect your interests. INVENTORS MAIL THI COUPON TODAY ply All out th made sp CLARENCE A.C Aa PASEO TS TRON EL oe coupe: Patent” and your “Record of Invention” form. {gE BOOK and my i I FR OK and my Ree- "TE ord of Invention form with Nam bette eee ee a out charge or obligation However WeUaldisreed TO aeii TEN l matters if you would send | your idea and $10.00 Search I Fee at once so that the very important preliminary | search ean be started for you (Be sure to write or print name clearly) sf eat lc ca era 4 Thank You for Mentioning Modern 8 ations for Mey When Writing to Adcerisers ee Thank You for te io fo Bay When Who Adve 145 vt Modem Mechanix ond tae

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