Modern Mechanix, February 1933

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| | | MAIL COUPON FOR FREE SAMPLE Mail Coupon for FREE demonstration sample showing toughness and flexibility and special agent's exclusive territory offer. I will show you how other men-are mak-' ing up to $6.00 in an hour with this amaz- ing product that is bought eagerly: by owners of motor cars and trucks. Mail coupon today. Wm. Stewart, President. Made $1,734 in Two Weeks Harry Gillig, of Kansas, forms his own sales company for distributing SPREAD-A- TREAD. Intwo weeks he sold 7 gross giving him a profitof$1,734. You have the same op- portunity. PLASTIC RUBBER COMPANY OF AMERICA Dept. B-235, E. Court St. Cincinnati, O. uP TO Mew, sensational discovery called SPREAD-A-TREAD. Covers dd worn tires with a new, tough, flexible, long- wearing tread for as low as 75c. Repairs a worn place for a few pennies. tional miles GUARANTEED. Many Spread-A-Tread applications Ап amazing opportunity fòr agents to; Rich territories now being allotted——act wear 6,000 to 12,000 miles. make up to £6.00 in an hour. today to reserve yours. SPREADS on witha knife —Dries over night Anyone can apply Spread-A-Tread. An old knife is all you need. No other tools necessary. lt spreads on like spreading butter on bread, Dries over night—tough, flexible and long-wearing. CAN’T come off. Ends Costly Tire Repairs — Helps Prevent Accidents SPREAD-A-TREAD ends costly vulcanizing or re-treading. Saves buy- i Helps prevent skidding, punctures, ing new blow-outs and accidents due to poor tires. and cracks. Rebuilds tire from outside without taking At least 2000 addi- Seals holes off car or even letüng out the air. Reinforces weak spots. Vulcanizes itself to the old tire so that it cannot crack or peel off. Saves delays and repairs. Protects fabric against water, grit, rot and wear. Makes driv- . ing safer.

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So you're going BACK TO WORKe THATS FINE! And more good news is that im- proved business conditions are sending thou- sands of other men back to work. But don't let your enthusiasm dim the facts. Business today, and from now on, has a new standard of service. It is a standard of efficiency —of training—and to ignore it is inviting another long stretch of unemployment. For your own sake, man, for your family's sake, do not flirt with this disaster! Especially foolish when you can acquire so easily thé training you must have . . . when you can make yourself more valuable on your job by devoting a small portion of your spare time to study. Їп years past millions of men have come to International Correspondence Schools for this training. Today, with its unusual conditions, is bringing many of these men back for additional training, to meet and solve the problems of a new day—and many thousands who have decided to face the facts and assure their own futures. Will you face the facts? Do you want to assure your future? Then this coupon is a challenge to you! Why not mark and mail it—right now? If de- sired, you can arrange to complete the course of your choice through easy monthly payments. INTERNATIONAL CORRESPONDENCE SCHOOLS “The Universal University” * BOX 2319.5, SCRANTON, PENNA. Without cost or obligation, please send me а copy of your booklet, “Who Wins and Why," and * tull particulars about the subject bejore which I have marked X: TECHNICAL AND INDUSTRIAL COURSES O Architect Li Architectural Draftemar О Building Estimating O Wood Millworking О Contractor and Builder О Structurel Draftsman D Structural Engineer О Electric Wiring O Electrical Engineer D Electrice Lighting O Welding, Electric and Gas О Reading Shop Blueprints C Business Management [1 Office Management D) Induetrial Management L] Personnel Management D Traffe Management D Accountancy O Telegraph Engineer O Telephone Work O Mechanical Engineer Mechanical Draftsman Ю Machinist O Toolmaker О Patternmaker О Pipefitter О Tinsmith O Bridge Engineer О Bridge and Building Foreman О Gas Engines Diesel Enginea О Aviation Engines О Automobile Mechan e О Plumbing O Steam Fitting О Heating D Ventilation O Sheet Metal Worker O Steam Engineer O Steam Electric Engineer O Civil Engineer D Surveying and Mapping O Refrigeration D R. R. Locomotives OR. R. Section Foreman ~ О R. R. Bridge and Building Foreman BUSINESS TRAINING COURSES D Cost Accountant О С. P. Accouncant O Bookkeeping О Secretarial Work О Spanish О French О Salesmanship O Advertising О Business Correspondence О Lettering Show Carde O Signs О Stenography and Typing O Complete Commercial D Civil Service О Mail Carrier D Air Brakes [] Trein Operation O Highway Engineering О Chemistry Pharmacy О Coal Mining Engineer O Navigation- О Boilermaker O Textile Overseer or Supt. О Cotton Manufacturing O Woolen Manufacturing О Agriculture Г] Fruit Growing О Poultry Farming O Radio O Marine Engineer O Railway Mail Clerk О Grade School Subjects О High School Subjects O College Preparatory О Mlustrating O Cartooning U Lumber Dealer Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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February, DONALD COOLEY Editor 1933: VOLUME IX PRICE 15 CENTS NUMBER 4 20 Cents in Canada CEN TS! Beginning with chis issue, Modern * Mechanix and Inventions, always a striking news stand value at 25 cents per copy, comes to you for only 15 cents. (In Canada, 20 cents.) The yearly subscription rate in the United States and possessions is now $1.50; in Canada, $2.25; Foreign, $2.00. А subscription assures you of receiving your copy regularly each month. CONTENTS for FEBRUARY SPECIAL FEATURES Amazing Secret Traffic in Gang Death Machines - By Sterling Gleason - 36 Makeup Secrets of Movie Horror Pictures - - By James Bowles 44 Engineering Genius Fights Destructive Avalanche By Calvin Frazer 54 Snowflakes—Artistic Masterpieces of Nature - - - - - - - - 70 Bring "Ghosts" to Your Home for Winter Parties - Ву Richard Coke - -` 82 Up-to-date Homes Have These Built-in Features - - - 102 11 Hu FIVE BIG "HOW TO BUILD FEATURES Build a Comedy Ford- - . o = © 2 80 Cut Your Coal Bills With Furnace X'eudladng- Fai: o. 0. 2 2 52 88 Rubber Bands Drive Midget Auto Three Miles - - - - - - - 90 The Long Harlequin Motor- - - - - 0. 2 2 c e 108 "All Sorts’—an All Purpose Boat - ~- - - - - - - = = 122 Golf Club Permits Longer Drive - - © 42 SH О RTE R FEATURES Huge Blowers Fight Orchard Frost- - - 42 Railway Falls Down Hill - - - 41 Non-skid Tire Has Rubber Studs - - - 42 Oddities of Science - - - ~- + 43 Steam Plane Motor Burns Furnace Oil- - 48 Pneumatic Tubes Replace Shell Caissons - 49 Stabilizers Fly Plane Pilotless - = Е - 48 Scanning Method Brings Television Movies - 51 Table Deals Bridge Cards - - 5 3 49 Fishermen Now Radiophone to Families- - 57 Bath in Soapsuds Is Reducing Method - - 50 Screening Fierce Battles in Drop of Water - 59 Device Gives Beauty Measurements - - - 50 Airplane Influence in Speedboat - + - 61 Sleep Outdoors With Home Comforts - - 52 Mechanical Aids for Busy Housewives -` - 62 Machine Weighs and Marks Eggs - - - 52 So Quiet You Can't Hear a Pin Drop - - 65 Two-way Radiophone for Duty in Riots- - 53 Master Strength Tests—Outdo Mightier Eat Your Breakfast on the Train - - - 53 Opponents - - - 66 New Machine Shuffles, Deals Bridge Hands - 57 How Much to Spend for a New Home - - 114 Engraving Machine Makes 3-color Cuts - - 58 Fortune Making Ideas for Inventors- - - 118 Device Forms Irregular Curves - - - - 58 Anti-bandit Blind Foils Robbers- - - - 58 NEW MECHANICAL INVENTIONS Streamlined Train Solves Rail Problems - 59 Car Has Automatic Trap Door in Roof - - 60 Robot Introduces Banquet Speakers- - - 40 Measures Millionth of Inch - - - - 60 Camera Records Auto Accidents - - - 40 Milk Bottle Converted Into Pitcher- - - 62 Stilt Walker Comes Down to Earth - - - 40 Mr. Pickadoodle Picks'em Up- - - - 62 (Continued on page 6) Published monthly by Modern Mechanix Publishing Co., at 529 7th Street So., Minneapolis, Minnesota. MODERN MECHANIX AND INVENTIONS entered as second class matter September 20th, 1928, at the Post Office, Minneapolis, Minnesota, under the act of March 3rd, 1879. Jack Smalley, Managing Editor. Copyright 1932. Advertising Offices: Chicago office, 35 East Wacker Drive (Phone State 2955); New York office, 52 Vanderbilt Avenue, Room 1603 (Phone Murray Hill 2-1555). Al manuscripts should be addressed to our editorial office at 529 So. 7th Street, Minneapolis, Minn. Manuscripts will not be returned unless accompanied by return postage. Advertising forms close on the 20th of the third preceding month. Price 15 cents a copy; $1.50 © Year 1n the United States and possessions. In Cannda, 20с per copy, per year $2.25. Other Postal Unions, $2.00 per year. Printed in U. 4

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Worth 55,000 To Him “I wouldn't take $5,000 for what you've done for me," writes C. B. Sterling. ‘Your training has actually in- ere: my income over 90095." Shortly after enroll- ing, he led the sales force of his company. A 300% Increase! From $75 a month to $300 and more per month—that’s the jump M. B. Scholes made thru N. S. T. A. Credits N. S. T. A. training with hls success and N. S. T. A. Employment Department for his present big pay job. Earns 2 Years Pay In 3 Months J. M. Huppert, a $23 a week plumber's apprentice, found Selling furs easier and more profitable than fixing leaks after N.S. Т. A. training. In his first 3 months he had made more money than In two years 1 at hls old job. $5,000 A Yearl Ask J. A. Ferland 1f N. S. Т. A. training pays. A French- Canadian railroad man—ittle education in English, N. S. T. A. training won him a sales managership at $5,000 a year to start. Last Years Pay Looks Like Small Change to These Doubled His Pay A. Robitaille found in N. S. "T. A. training “а lifetime of selling experlence.’’ ''My earn- Men Today! Here are six men who were formerly caught in the hopeless tread-mill of low-pay jobs. Today every one of them reports earnings Írom $4,000 up to $10,000 a year! Right now —the same opportunity that changed their lives so completely is open to you! Don't fail to read every word of this vital messagel His Own Boss—At Doubled Wages "Im my own boss now,’ й roudly writes W. Hayes, an f T, S. T. A. graduate. "Since taking this course í have more *han doubled my in- dngs have jumped to 100% more than I got at the time I began studying your course.”* When a man who bas been struggling along in a low-pay job suddenly steps out and starts earning real money—$5,000, $7,500 or $10,- 000 a year, he usually gives his friends quite a shock. It is hard for them to believe that he is the same man they used to know. Take one of the men whose pictures appear on this page— J. M. Huppert, for example. Huppert was a plumber's apprentice at $23 a week. If he had predicted that he was about to make two years' pay within a period of three months, his friends would have thought he was joking. But he knew what he wanted, and he set about getting it in the shortest possible way. “The Key To Master Salesmanship" opened his eyes to the opportunities in the These FREE Books! You may have doubts in your own mind about how. salesmanship can help you solve your own problem. If so, all the more reason to send for these two books: ‘The Key To Master Sales- manshlp" and ‘‘Mistakes Commonly . Made In Selling." See for yourself what salesmanship has done for thousands already; see how this training hasbrought sudden success to men who thought they were doomed to failure, after disappoint- 3 ing experiences in sales work. Nomatter “esment i what your experiencc has been, or what waded] your presentihoughit: onselling are, send for these two books today and learn these amazing new facts. Mail the coupon now! come." In one week recently | three other concerns tried to hire him away from his§ present job. selling profession. Thisbook proved that Master Salesmen aremade, not "born." It told facts and secrets about mon- s ЕЕ ey-making that were а positive revelation. And best of all, it outlined a simple plan that enables men from all walks of life to quickly reach the top without spending years on the road—without losing a day or a dollar from their present positions! A Few Weeks—Then Bigger Pay Huppert seized the opportunity to qualify as a Master Salesman, and has richly profited by it. He now reports an increase of many times his former weekly earnings, and his future possibilities are unlimited. Some of his former friends perhaps say he was Ae He was. But his ‘‘luck” lay in his decision to cast his lot with the N.S.T.A. Thousands of other men have been similarly "lucky." Some report increases ranging up to 900%. They have forgotten the days when they were caught in the rut—but they never forget that they owe a great part of their success to N.S.T.A. training. NATIONAL SALESMEN’S TRAINING ASSOCIATION Dept. B-705, 21 W. Elm St. Chicago, Ш. тита PS Ga SS ранна рана ИЦ uc: (Еи шшер — P PUR: ША National Salesmen's Training Association, Dept. B-705, 21 W. Elm St., Chicago, I. Without cost or obligation I will accept copies of your | books “ТҺе Key To Master Salesmanship” and "Mis- takes Commonly Made In Selling," with details of your System of Training and Free Employment Service. l Мате с garre oun we aad Bel gb елуге у 1 Address " | Ср PER State. ........... * | л е oy Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 5

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TABLE OF CONTENTS — Continued From Page 4 Toaster for Gas Stoves - - 62 Washing Machine for Small Apartments - 62 Bell on Bottle of Dangerous Medicine - - 63 Adjustable Bottle for Babies - - - + 63 Airtight Stopper for Catsup Bottles- - - 63 Device Curls Milady's Eyelashes- - - - 63 Robot Lady Writes Letters, Draws Pictures - 64 Milady Can Make up in Auto - - - 64 Perambulating Paper Stand Boosts Business - 68 Tray Helps Preserve Eggs, Fruit - `- - 68 Frying Eggs Over Cake of Ice - - - - 69 Trunks Equipped With Wheels - = + 69 A Flashlight for Milady's Purse - - - 69 Non-sinkable Blind for Duck Hunters - - 130 Bed Compass Locates North Pole - - - 130 Self Applying Bandage for Cuts - - += 130 FOR the MOTORIST Easily Made Glareless Mirror - - - 53 Roof Trap Door Prevents Head Bumps - = 60 Champion Auto Has 59 Gadgets - + - 64 FOR CRAFTSMEN, YOUNG and OLD How to Grow Magic Salt Flowers - . - 50 Making Embossed Stationery - - 52 Chimney Draft Winds Automatic Clack. - 85 Anti-smear Stunt for Draftsmen - - - 85 Helpful Ideas for the Home Fix-it Man- - 86 Making Your Windows Frost-proof - - . 86 Removing Glass Stoppers - - - «a - 86 Easy Thermometer Repair - - >- - . 86 For Frozen Pipes - - - - - - - 87 Plaster Repair Kinks - - 0. = 87 Simple Cure for Leaky Valves e - a 5 89 Fireless Cooker, Refrigerator in One - - 96 Chemical Fun for the Home Laboratory- - 97 Worn Out Files Make Lathe Tools- - 98 Unique Stunt for Developing Films - 98 Build a Towser Tickler for Your Dog 104 Oilstone Has Dropper Attachment - 106 Car Chassis Makes Novel Swing 107 Tracings Utilize Lighter Fluid - - 107 Old Fashioned Bellows Decorate Fireplace 115 Handy Mannikin for Draftsmen 116 Gate Kink Admits Humans, Bars Animals 116 Keep Up Baseball Skill With Dart Game 117 Decorate Home With Antique Lantern - 120 Power Mower Cleans Snow Off Rink - 121 New Winter Sport—Coasting on Snow Skates 121 Home-made Press Extracts Fruit Juices - 128 Sled Stove for Skating Parties - 129 Kitchen Chair Makes Ice Sled 129 FOR the RADIO FAN Scanning Method Brings Television Movies - Two-way Radiophone Does Duty in Riots - Fishermen Radiophone to Families - - - Sparks From the Radio Editor - - - Edited by L. B. Robbins Hooking Extra Receivers to Antenna- - Easily Made Bug for High Speed Sending - Automatic Key Makes Dots While еш, Stand By - > ANIATION Artificial Radio Signals Teach Blind Flying - Steam Plane Motor Burns Furnace Oil - Stabilizers Fly Plane Pilotless - - · 51 53 57 99 99 100 101 72 48 48 The Shop Mail Box Will Be Found This Month on Page 10 HANDIKINKS Radiator in Pipe Gets More Heat From Stove - Inner Tube Band Helper оп One-man Saw Pair of Skis Makes Runner for Coaster Auto Springs Make Hole Digger - Emergency Workshop Light From Spark Plug Sift Ashes With Garden Rake - - - Furnace Pipe Heats Water for Kitchen - - Scalding Ice Box Without Danger of Burns - Slots in Drawer Prevent Spilling - - -~ Converting Coupe Into Bedroom - - Gate Lowers When You Drive Over It Ice Canoeing Is New Winter Sport - - Induction Coil for Experimenters - - - Simple Stunt to Save Cracked Saw Blade Timbers Shifted Easily оп Saw Horse Tube Base Makes Experimenters’ Plug INTERESTING ITEMS Know Anybody Acting Like This? Rubber Streets to Save Buildings Grind Organ Shoots Mechanic - Hot Water Cure for Insomnia - Гоо Much Nudism Is the Bunk E Three Marks of True Nightmare War Deaths Deepen Depression Rubber Used in “Acidseal” Paints Lowliest Microbes Have Memories - Freckles Frozen Off With Dry Ice - New Germs Found in Musical Horns - Trunks Equipped with Wheels - - Unique Death Test Easy to Apply . - Invisible Glass for Show Windows - à Precautions Against Child T. B. e = 74 74 74 75 75 75 76 76 76 77 77 78 78 79 79 79 40 42 42 48 50 52 53 58 60 64 68 69 98 107 130 Douglas Rolfe Plane Talk Editor Pilot Gene Shank Famous Aviator, Holder of Light Plane Endurance Flight Record S. S. Rabi as authorities. A. Neely Hal! Author of * ‘The Boy Crafts- man,” etc. Seaplane Designer and L. B. Robbins Naval Architect Nationally Known Radio $ Expert EDITED BY EXPERTS Listed here are the members of the Modern Mechanix Board of Editors, all qualified by national repute to serve They will gladly answer questions from readers if stamped envelope is sent. care of this magazine, 529 S. 7th St., Principal, Cincinnati Auto- Raymond F. Yates Patent Expert Weston Farmer Consulting Editor J. Russell Dye Associate Edltor Address them in Minneapolis, Minn. Ray F. Kuns motive Trade School Alfred Albelli New York Editor Roger Fawcett Associate Editor

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PAY FOR YOUR TRAINING Practical work on real Electrical machinery Ата пр бале | Way to Get Into ELECTRICITY Dissatisfied with your job? Not making enough money? Then let me show you an easy way to get into Electricity, where thousands of Trained Í Men are drawing down Big Pay envelopes every week. Coyne has been training men for the Elec- 4 trical Industry since 1899. 12 WEEKS’ TRAINING HERE | IN MY SHOPS WILL GIVE YOU THE START YOU NEED. WHY | CAN DARE TO MAKE You can now take Coyne Training without paying for your train- А ing until 2 full months after graduation, and then | give you 10 months to completo your payments! That's my LATEST, GREAT- EST OFFER! I сап dare to do this because the type of man who 1 really wants to get ahead, is honest. If you're ambitious enough | to send in the coupon below, I know you'll make good! Practical Work in COYNE SHOPS 1 It's EASY to learn a BIG-PAY TRADE with my ''Learn-by-Do- ing'" method. Not by books, not by correspondence, but by AC- @ TUAL PRACTICAL WORK JUST LIKE YOU WOULD DO ON а THE JOB. That's why many concerns endorse Coyne and prefer Coyne Trained Men. Many Earn While Learning If you're short of funds, don't let that stop you. Many students earn all or a large part of their living expenses doing part-time i Н.С. LEWIS, President Й COYNE ELECTRICAL SCHOOL, Dept. 23-53 500 S. Paulina Street, Chicago, Linois Gentlemen: Please send me your big Free Electrical Book, with || 151 illustrations and details of your "Pay After Graduation'' offer. І This does not obligate me in апу way. GRAD A Stadent working on Television transmitter in с Coyne Radio Shops TER YOU kan RADIO TELEVISION TALKING PICTURES Prepare for jobs in Service Work, Broadcasting, Talking Pictures, Wireless Operating, etc. Get in on the ground floor of Television! Radio has grown in а few years from a mere experiment | to a Billion Dollar industry. There are many oppor- | tunities for the trained man. PREPARE FOR THEM | NOW BY 10 WEEKS OF ACTUAL SHOP WORK AT COYNE! THIS SENSATIONAL OFFER!) work while here. We'll help you—and then help you get located when you graduate. Coyne Employment Service produces amazing results, You receive this service absolutely FREE as my student, [i REAL JOBS—GOOD MONEY-—QUICK1 *'Coyne boosted my pay from $20 to $50 a week,” writes D. Ells- fj worth, North Carolina. “Got this flne job on shipboard, thanks to Coyne Training, and now make $350 a month," says G, Р, Vautrot, California. Hundreds of successful men boost Coyne. P ‘What they have done, you too should dol Get Pay-Raising Facts FREE! Select the field you like best, then mail one of the coupons below. Let me send you either my BIG FREE ELECTRICAL BOOK or MY BIG FREE RADIO-TELEVISION BOOK. No cost or obli- § gation. Do it today! $ H. C. LEWIS, President RADIO DIVISION, COYNE ELECTRICAL SCHOOL 500 S. Paulina St., Dept. 23-1H, Chicago, Ш. Gentlemen: Send me your Big Free Radlo, Television and Talking Picture Book and details of your “Рау After Graduation” offer. В і This does not obligate ше іп апу way. ! | | Thank You јог Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 1

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Broadcasting Stations employ trained men for jobs paying up to $5,000 a year. Television—the coming field of Many great opportunities —is covered by my | | course, Spare Time pave many S. R T ong uo P200 о $1,000 8 year. Fall е шеп make as $06, and $76 a week. — 7S 395; |Talking Movies—an invention made possible by Radio —employs many well trained Radio men for jobs paying :ав much as $75 to $200 a week, gives you information on the opportunities in Radio and explains how I train you quickly to become a Radio Expert through my practical Home Study training. It is free. Clip and mail the coupon NOW. Radio’s amazing growth has made hundreds of fine jobs which pay $50, $60, $75, and $100 a week. Many of these jobs may quickly lead to salaries as high as $125, $150, and $200 a week. : Radio—the field with a future Ever so often a new business is started. You have seen how the men who got into the automobile, motion picture, and other industries when they were started had the first chance at big jobs—the $5,000, $10,000, and $15,000 a year jobs. Radio offers the same chance that made men rich in those businesses. It has already made many independent—will make many more wealthy in the future. You will be kicking yourself if you pass up this once-in-a-life- time opportunity. Many Radio Experts make $50 to $100 a week In a few years 300,000 jobs have been made by Radio’s growth. Thousands more will be made by its future development. Men with the right training —the kind of training I will give you in the N.R.I. Course—have stepped into Radio at 2 and 3 times their former salaries, Experienced service men as well as beginners praise N.R.I. training for what it has done for them. Many make $5, $10, $15, a week extra in spare time almost at once My Course is world-famous as the one *'that pays for itself." The day you enroll I send you material, which you should master quickly, for doing 28 Radio jobs common in most every neighborhood. Through- out your Course I will show you how to do other re- ‘pair and service jobs on the side for extra money. I will not only show you how to do the jobs, but how to get them. I'll give you the plans and ideas that have made $200 to $1,000 а year for N.R.I. men's spare time. G. W. Page, 110 Raleigh Apts., Nash- ville, Tenn., writes: “I made $935 in my spare time while taking your Course." Police Depart- ments are find- ing Radio a great aid in their work. Many good jobs have been made inthis new field. My book, “Rich Rewards in Radio," Sample Lesson FREE I'll send you a Free Lesson to prove that my Radio. Course is easy, practical. That's how con- fident I am that. I can train YOU at home in yourspare time to become a Radio expert. Only my students could have this book in the past, LKNOW that when you see it, read it, examine it, you will be delighted with its clear, simple way of teaching Radio.. I KNOW—because I have ALREADY trained thou- sands of men. Many of them with not even a grammar school education, and no Radio or electrical experience, have be- come Radio experts and earn two or three times their former pay. Mail the coupon now. Some of the Jobs N. R. I. Trains Men For Broadeast Engineer Maintenanee Man in Broadcasting Station Installation Engineer of Broadcast Apparatus Operator in Broadcast Station Aireraft Radio Operator Operator of Airway Beacons Service Man on Sound Picture Apparatus Operator of Sound Picture Apparatus Ship Operator Service Man on Public Address Systems Installation Engineer on Public Address Systems Sales Manager for Retail Stores Service Manager for Retail Stores Auto Radio Installation and Service Man Television Broadcast Operator Set Servicing Expert meres Thank You for Mentioning Modern Mechanix and Inventions for February Then Writing to Advertisers

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$400 Each Month “I spent fifteen years as traveling salesman but could see the op- portunities in Radio. I have made more money than ever before. 1 һауе made more than $400 each month and it really was your course that brought me to this.” J. С. Dahl- plead Radio StationK YA, San Francisco, Radio Service Man Doubles Salary "I spent 15 years building and repairing Radios, but felt I could refresh my memory. Upon complotion, I was appointed Service Mana. Ke of ug & Hull, I give I, full credit for my success---it immediately increased my earnings 100 percent.''J. E. McLaur- me, 1611 Gnilford Ave., Baltimore, Md. From §10 to $50 a week in Spare time "'Hesides being em- pored by the Power & ight Company ocate Radio interference, Ihave a service business of my own that nets me from $10 0 а week i spare time. I owe all my suc- сенз to the National Radio Institute, as I was only в common factoryworker.’ 1. L. Penie, 812 W. Hig Street, Piqua, Ohio Get ready for jobs like these Broadcasting stations use engineers, operators, station managers and pay up to $5,000 a year. Radio manufacturers employ testers, inspectors, foremen, engineers, service men, buyers, and managers for jobs paying up to $6,000 a year. Radio dealers, jobbers (there are over 35,000) employ service men, salesmen, buyers, managers and pay up to $100 a week. Talk- ing pictures pay as much as $75 to $200 a weekto men with Radio training. There are hundreds of oppor- tunities to have a spare time or full time Radio busi- ness of your own, I'll show you how to start your own business on money made in spare time while learning. My book tells you of other opportunities. . You can learn at home in your spare time to be a Radio Expert Hold your job. There is no need for you to leave home. I will train you quickly and inexpensively during your spare time. You don’t have to be a high school or college graduate. My Course is written in a clear, interesting style that almost anyone can grasp. give you practical experience under my 50-50 method of training—one-half from lesson books and one-half from practical experiments with equipment given without extra charge. It makes learning at home easy, fascinating, practical. Learn the secrets of Short Wave, Television, Talking Pictures, Set Servicing, Broadcasting I'll give you more training than you need to get a job—I'll give you your choice, and not charge you extra either, of my Advanced Courses on these fub- jects—(1) Television, (2) Set Servicing and Mer- вапше э Sound Pictures and Public Address Systems, (4) Broadcasting, Commercial and Ship Radio Sacs (5) Aircraft Radio. Your money back if not satisfied T will give you an agreement in writing, legal and binding upon this Institute, torefund every penny of your money upon completing my Course if you are not satisfied with my Lessonsand Instruction Service. The resources of the National Radio Institute, Pioneer and World's Largest Home-Study Radio School, stands behind this agreement. Find out what Radio offers you. Get my book AT ONCE. One copy of my valuable 64-page book, “Rich 2 Rewards in Radio," is free to any resident of tif С. S. and Canada over 15 years old. It Һа started hundreds of men and young men on the roadtobetter jobs and a bright future. It has shown hundreds of men who were in blindalley jobs, how to get intoeasier, more fascinating, better paying work. Ittells you where the good Radio jobs are, what they pay, how you can quickly and easily fit yourself to be à Radio Expert. The Coupon will bring you a copy free. Send it at once. Your request does not obligate you іп any мау, ACT NOW. J. E. SMITH, President Dept. 3BH, National Radio Institute Washington, D. C. SPECIAL Radio Equipment for Broad Practical Experience Given Without Extra Charge My course is not ell theory. I'll show you how to use my special Radio Equipment for conducting experiments and building circuits which illustrate important principles used in such well-known sets as Westinghouse, General Electric, Philco, R.C.A., Victor, Majestic, and others. You work out with your own hands many of the things you read In our lesson books. This 50-50 method of training makes learning at home easy, interesting, fascinating, in- tensely practical. You learn how sets work, why they work, how to make them work when they are out of order. Training like this shows up in your pay envelope— When you graduate you have had tralning and experience— you’re not simply look- ing for a job where you can get experience. With N. R. X. equipment you learn to build and thor- oughly understand set testing equipment—you can use N. R. I. equipment in your spare time service work for extra money. I have doubled and tripled the salaries of many Find out about Mr. J. E. Smith, President National Radio Institute, Dept. 3BH Washington, D. C. | | I want to take advantage of your Special Offer. Send me your sample lesson and your l free book about spare time and full time Radio opportunities and how I can train for | | ihem al home. This request does not obli- gite me. NAME The Famous Course That Pays For Itself фи Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers ©

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Here is the operating locale of Byron Cudd, Menomonie, Wis., reader of Modern Mechanix. Left, the garage, next the macbine shop, then the Diesel engine Cudd has built (see text) and right, the fuselage of his experimental airplane. Andy's Shop Mail Box Andy comes through this month with less talk and more action in letting readers hold sway in the "colyum" he has made famous. They do a better job than he can, says the Grizmonk. NE of the most misguided projects my dearly beloved readers continually ask advice on is the construction of airplane type catamaran speed boats, or whatever you call 'em. You know—pontoons with an airplane fuselage, and a prop up front all same airplane. A'lot of the boys write me about how to build one and why don't we run plans, etc. The an- swer is, I will when I see one that will work. Some day no doubt some smart cookie will de- sign one of these things that will really go. But it will have to have a lot of power, be light, and be devoid of the cussedness now exhibited by every member of the breed. Read this letter; glimpse this photo; then hear what Andy the Grizmonk has to say. Minneapolis, Minn. Dear Andy: I am enclosing a snap of a rig built by a partner, Mr. Carl Lostrom, and myself of Park- ville, Minn. It is powered by a Model T Ford converted engine and sits on floats 11% feet lóng and 18 inches wide. The floats were made of a framework of white pine which was Here's Richard Erickson's straddle bug, the trials of which are told in the letter in the column. 10 covered with masonite prestwood which is much cheaper thàn plywood and serves the purpose very well. We found a water rudder necessary because when the lake was a little rough she would head into the wind and stay there. We made the floats seaplane style with the step slanting upward. This was a very bad mistake because the bottom surface to plane on was so lowered that we could not get it up on the step. It just plowed through the water at about 20 miles per hour. We hope to eliminate the step so as to get some surface to plane on. We spoiled one prop by going out when the lake was very rough. The water splashed up into the prop and in about 10 minutes the tips were so badly worn it was out of bal- ance. We didn't notice it until the motor be- gan to vibrate. The rig cost about $80. I would like to hear from anybody who has had experience with a rig like ours and will give anybody info on a rig like this. Yours, RICHARD ERICKSON. P.S. I think your magazine is perfect. I sup- pose this letter is too long to print but I would appreciate your passing the info along that I would like to hear from any fellow on the subject of air driven rigs. There you are. The troubles Dick Erickson found in his water straddler are common to the breed. Note he says he had to put a water rudder on her. Note he had trouble with the prop. Note he got 20 miles an hour (maybe) and that the ship wouldn't plane. Well, let me tell you. І The chief reason these straddlers are not yet (Continued on page 16)

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Vromofetf- nen others were fired! The Story of LaSalle Student Shaw "Since the War I have been book- keeper at $35 a week. Married, with one baby girl, I found it harder every month to make ends meet. Е was desperate! “Smiling, the boss handed me a let- ter. It was from LaSalle to him, announcing my enrollment and my food work on the first lesson. ‘We are keeping you,’ he said, ‘because we like your spirit.’ “Last winter my wife brought me a LaSalle ad on Higher Accounting showing how I could study in spare time for the job ahead. E investi- gated, and enrolled January 23, Just in time! For— "Naturally, I had more work to do, with the smaller force, but my train- ing made it easier. I learned quickly, and when the Department Manager left,the boss moved me up. “Suddenly, orders came through to cut the force. I watched seven men in my department get the bad news and leave. Then the office boy tapped me, Said I was ‘next.’ My heart sank as I followed him to the Front Office. “I have since been promoted twice, and now carry the title of. Chief Accountant-—at a salary several times greater. The future looks bright. If it had not been for LaSalle, i would be looking for a job right now." LASALLE EXTENSION UNIVERSITY Dept. 2493-R, Chicago Please tell me how 1 can take full advantage— right now—of the opportunities in the business Iam checking below. And send along your free booklet on that field. L1 Business Management Li Traffic Management O Modern : Salesmanship Li Paper Salesmen’s Training LL. B. Degree O Railway Station п Commercial anagement Law O Industrial П Office Management Management O Higher O Chain Grocery Accountancy Management O Expert O Business Bookkeeping English O Effective Speaking П Foremanship BIGGER PAY FOR YOU-[ thru LaSalle Sparelime Training а That's а story of what spare-time study has done for just one man. There are thou- sands of others like Shaw who found themselves through LaSalle. Now—how about yourself? Do you want a better posi- tion and higher pay? You can win them, even today, if you can do the work. LaSalle experts will show you bow, personally guide you step by step to success. Simply mark on the cou- pon the field you are interested in, and we will send. you FREE, a valuable booklet about it, telling of opportunities open to you.-No-cost or obligation—and what you find out may put you on the road to suc- cess. and financial independence. The opportunity that is open today— right now—may not be here tomorrow. Don't put it off—but reach for your pencil, fill out, and mail today. O Railway Accounting О Business Correspondence L1 Personnel anagement O Law: Position...... LASALLE EXTENSION UNIVEESITY Roe -Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 11 -Ф

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Small Ideas May Have Large Commercial Possibilities: Delays are Dangerous in Patent Matters THE FREE BOOK shown here was prepared for inventors, to show them exactly what steps they must take to secure a PATENT. If you have an idea, you should send for THIS BOOK AT ONCE. It will tell you exactly how an application for a Patent is made, what information you I Serve You Quickly and Secretly Anything you write me or send me is strietly confidential between us. АП let- ters and drawings are kept in strong, Steel, fireproof files, which are open only to myself or authorized members of my staff. I have secured patents for inven- tors located in every state in the Union. My organization is a large and efficient must furnish your attorney, and what steps he must take in order to protect your inter- ests. Remember, inventing an article is one thing—securing the exclusive right to manu- facture it, use it or sell it is another. Without a U. S. Patent, you cannot expect to reap the profits that your in- vention may make possible. Send at once for this book. After you get that, you'll know exactly what to do to protect yourself. constant employ. 9 The photo at the right shows а section of my large filing depart- ment. All disclosures from clients are held in the strictest confi- dence in strong, steel files. КЕТ € Above is а view of my drafting and specification rooms where a large staff of experts is in my Important! Please understand that you are not under the slightest obligation in sending forthisbook. I will mail it, together with the Record of In- vention form, thesame day I receive your re- quest. Use tie coupon on the opposite pageto save yourself time and trouble. Afterthat, you will be in position to proceed or not as you choose,to make your ap- plieation for a patent. one. My practice is confined entirely to Patents, Trade- marks and Copyrights. I have had years of experience in Patent Matters. When you place your ideas in my hands, Iam in position to proceed at once to secure protection for you. My fees are reasonable, and if you desire, I can arrange convenient terms of payment.: My Location in Washington My offices in Washington are convenient to the Patent Office, and I and my as- sistants can, therefore, appear promptly before the officials and Examin- ers. npe 12 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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write today or this FREE Book, е This Book Tells: How your Patent Application is made ; what kind of sketches or drawings are necessary; what other papers must be made out; how the Patent Laws protect you; why it is important to avoid loss of time in getting your application filed; and many other important points. Even a very sim- ple idea, if new and useful, may prove very valuable. You may have much to gain and nothing to lose by sending for this book TODAY. — eS ЧЕ ИШИНИ A view of the new Dep't of Commerce Bullding where the U. S. Patent Office is now locgted. CLARENCE A. OBRIEN REGISTERED PATENT ATTORNEY i WASHINGTON, D.C. CLARENCE A. O’BRIEN, Registered Patent Attorney, 317-W, Adams Bldg., Washington, D. C. Please send at once your book, “How to Obtain a Patent” and your “Record of Invention” form. FREE Record of Invention Blank А МАМЕ........... ———————— ——— — Along with my book, I will send you my Record of Invention form, also FREE. This blank will enable you to make a sketch of your idea in АррвЕѕѕ............. dara se VAR gre E E СЕРИИ СНЕ рет proper legal form and have it wit- nessed in such manner that it may be of value to you as evidenceshould the occasion for evidence arise. In my book, I tell you how to use this form to protect your interests. -chii "ette t t t n n ++ жж ж зэ а э в жоя е а а ө а э а ө ө а өз ө ө ө ө ө э ө э ХЖ (Be sure to write or print name clearly) ————————e eae Thank You јог Mentioning Modern Mechanix and Inventions for February When Writing to’ Advertisers 13

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Delays in Patenting Your Idea May Prove Costly Get the Facts—Mail Coupon Now ACT AT ONCE—and protect your idea. Remember, to get the benefits of your invention, you not only have to invent it—you have to PATENT it. Many men spend years perfecting an invention, only to find that someone else thinking along the same lines has already received a patent on the idea. When we think of all such cases that have come under our personal observation, we cannot urge too strongly that vou take steps to protect your idea IMMEDIATELY. Delays of only a few days may be vitally important to you. Do not - lose all the benefits of your hard work in planning and perfecting your invention. Mail the Coupon £or FREE Book Today It is of tremendous importance that you file your application for a patent at once. Our free book tells you how to proceed, what you need to know about patents in general and gives you an estimate of our reasonable fees. We also send you a “Record of Invention" blank. Take the first step toward getting your patent now. Mail the coupon at once. If you send along a sketch and description of your invention, we will promptly write you what, in our opinion, ought to be done in order to protect it, and for which service there will be no charge. ; Highest References—Strictest Secrecy 35 Years of Proven Service—Deferred Payments The members of the firm of Victor J. Evans & Co, are registered Patent Attorneys. Our legal and technical forces include lawyers, registered patent attorneys, patent draftsmen and searchers. Our Patent Office and Federal Court practice is confined to patents and trademarks. We specialize in these . two subjects to the exclusion of all others. In our 35 years of patent practice, we have successfully served thousands of inventors to whom we can refer. It is a distinct advantage to an inventor to employ an attorney located in Washington as the U, S. Patent office has no branches, Here's How We Operate As soon as the description of your invention comes into our office, it is immediately put in charge of an attorney, who is particularly familiar with the kind of invention you have perfected. Under his close personal supervision, patent searchers and skilled draftsmen work. He personally sees your case through to its conclusion. In short, you have the advantage of highly skilled and experienced service. -Qil 14 Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers npe.

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| VALUABLE RECORD ^ OF INVENTION BLANK Mail the coupon today, and in addition to the Íree book, we'll send you without charge a *Record of Invention Blank." This form, when properly filled out, may be of value to you as evidence should occa- sionrequire it, There is no charge or obligation for this Д VICTOR J. EVANS & СО. 3 ‘Victor Buliing, 726726 Nath S. NW ` Мыр, D. С, — Cenik: A mend yox € aketch aad description of my tavention, whkh 1 о е Ё nd ый that you advise кыз whether or vot in yoor opinion Ше tama may e patented, if mew. Yours very try, gu the Dre page ed aer 3 e | Kame Фа When tt May Contem: Be it Known that. TES has this of —_____- 192 — disclosed to the invention illustrated and described on this sheet and Ё fully understand the construction. thereof. | What the Coupon Brings Mail It Today! Mail the coupon today and take the first step toward protecting your idea. You wil receive the FREE Book, а FREE Record of Invention Blank, and informa- tion on our fees. You create no obligation by. mailing this coupon. Our service is com- plete, our fees reasonable and our terms convenient. Don’t waste priceless time; mail the cout NOW. ‘VICTOR J. EVANS & co. Established 1898 MAIN OFFICE: 605 BB Victor Building, Washington, D. C. BRANCH OFFICES: 1640 BB Conway Building, Chicago; | 233 BB Broadway, New York; 828 BB Fidelity Philadelphia і Trust Building, Philadelphia; 514 ВВ Empire Building, Pittsburgh; 1010 BB Hobart Building, San Francisco. і Please send me your free book, "How to Obtain a Patent," and your "Record of | Invention Blank." This request dees not obligate me. | Матпзё- ———————À—— ———— — - і Street and М№о..................-..-.-.--.------.---- — — dssgeeente ———Ó — | X ui a aria State............ — — pisse save siga i | i mos- = Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 15

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U. S. Government statistics show that a man who has obtained specialized training in College or En- gineering School earns $1,313 a year more than 2, High School graduate—or a total of $52,520 more during his working life of 40 years. If you can’t go to college, you must nevertheless get specialized training in order to compete for the better-paid jobs. So it’s far cheaper to invest a small amount of time and money in a home-study course that will give you the necessary training, than to make no effort at self-improvement and be forced to take a job paying $1,313 less per year. 3. Best-Paid Lines The greatest number of well-paid young people are found in Business—Drafting—or Electrical work, because these three big lines offer many opportuni- ties to those having the spectalized training neces- sary to hold responsible, well-paid positions. Business & Accounting: Every concern keeping records or handling money employs Accountants. Drafting & Design: Draftsmen constantly needed by Engineers, Architects, Manufacturing Plants. Electrical Engineering: One of the livest, fastest growing industries, with frequent new opportuni- ties for trained men. Taught at Home by Experts Our special texts were prepared by over 200 of the best- known Engineers, Business Executives, Educators, etc. Many used by resident colleges, trade schools, U, S. Navy, Province of Manitoba, Cean., etc. School chartered 35 years ago as an educational institution, not for profit, like the best resident colleges. Registered in Illinois as professional correspond- ence school, " We can give you thorough, practical home training, largely of college standard, in the line most attractive to you. Next to a college education, American School training is best. Cou- pon will bring full information on line you prefer, and list of students and graduates in your locality. American School Dept. G-233, Drexel Ave. at 58th St., Chicago, Ill. How can I qualify for well-paid position in line checked? ANDY'S SHOP MAIL BOX (Continued from page 10) successful is a fundamental naval architectural reason; there is so much interference between floats that they cannot act efficiently as hydro- planes. Airplane designers know this. But they put wings on airplanes to make 'em fly, and part of the reason the float system "gets by" on an airplane is because there are wings to help lift them out of the water. Forgetting other con- siderations, an airplane designer would sooner put a single float on a ship than the double ar- rangement. More efficient both on water and in. the air, But harder to handle. Next; With the wings left off, the ship must be even lighter to enable it to plane, as all the weight must be supported by floats. Next: Water rudders have to be added. See what I've told you before? Cross winds, or any kind of a tail wind make these crates unman- ageable. On top of that most of them are powered with motors unfit even for pushing an old auto around. What could be expected out of a heavy, irrationally designed, underpowered straddler than failure? To me the answer remains just—nuts. Here's some interesting dope on a glider: Vernon, B. C., Canada. 529 So. 7th St., Minneapolis, Minn. Dear Andy: : Enclosed are some snapshots of our Nor- throp Glider built from the plans taken from your 1930 “Flying Manual.” It was built by Jim Duddle and myself 18 and 17 years old respectively. It took 6 . months to complete and its performance was far above our expectations and to date it has had over 2,500 flights without a crack-up of any kind. We usually use 600 feet of % in. rope, but for the best flights we use 1,300 feet and reach an altitude of around 600 feet. We do considerable gliding at night in the moonlight. We made a few minor changes, one being substituting compression struts instead of com- pression ribs. We also substituted nose, or false ribs, for a plywood leading edge. M. M. and Pack Mag are two great maga- zines and I always look forward to the new issues. Your truly, ELDON SEYMOUR. А commendable effort, Mr. Seymour. [] Business O Drafting O Elec. Eng. Eldon Seymour has built this Northrop Glider which has Name M——————— eee Age P" more than 2500 flights to its credit. Seytnour flies sometimes Addresa eve so RECS gel Vana rex ВЕШ А by moonlight. . (Continued on page 18) е "ee 16 . Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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— Most Perfectly Developed Man” “Pil Prove to You in 7 Days that YOU, too, Can he this NEW MAN?" —CHARLES ATLAS WEEN I say I can_make you over into a man of giant power and energy, I know what I’m talking about. I’ve seen my new system of body development, Dynantic-Tension, transform hundreds of weaker, punier men than you into Atlas Champions. Take myself, for instance! I used to weigh only 97 pounds. I was a sickly scare-crow. Then I discovered Dynamic- Tension. It gave me a body that twice won me the title “The World's Most Perfectly Developed Man." It can work just as big a change in you, too! I’m so sure of it that І make you this amazing offer: At my own risk I'll give ou PROOF in just seven days that J can make you over into this NEW MAN. I'll begin training you ox approval. If you don’t notice a marvelous change in yourself within а week you don't owe me a cent. No “ifs,” “ands,” or “maybes.’? Just tell me where you want handsome, steel-like muscles. Are you fat and flabby? Or skinny and gawky? Are you short- winded, pepless? Do you hold back and let others walk off with the prettiest girls, best jobs, etc.? Give me just 7 days! ГІІ PROVE to you that І can make you a healthy, confident, powerful HE-MAN. Dynamic-Tension is an entirely NATURAL method. No mechanical apparatus to strain your heart and. other vital organs. No pills, special foods, or other unnatural, artificial contraptions. Only a few minutes of your spare time daily is enough to show amazing results—and it's actually fun! Dynamic- Tension does the work. : Send for FREE Book Mail the coupon right now for full details and 17И send you my illustrated book, “Everlasting Health and Strength." Tells all about my “ Dynamic- Tension" method. Shows actual photos of men I've made into Atlas Champions. Supplies the facts you need to know about your condition. It’s a valuable book! And it's FREE, Send for your NOTE: No cther Physical instructor in the World has ever DARED make such an Offer! CHARLES ATLAS Dept. 6-2 133 East 23rd Street, New York City I want the proof that your system of “Dynamic-Tension” will make a New Man of me—give me a healthy, husky body and big muscular development. Send me your free book, “Everlasting Health and Strength.” This request places me under no obligation. po ——————————————— —" (Please print or write plainly) copy today. Mail the coupon to me personally. hl TEE EE CHARLES ATLAS, Dept. 6-2, 133 East 23rd x Street, New York City. р City - — ——————— O E © 1932 C. A.Ltd. e i MM MÀ— À—— M —M À— M E E a e e S aia n Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 17

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Big 12'' all-balsa Glider Free with each ‘‘build-It’’ plane ordered from this ad! Loops, stunts! Fun galore! Reedeach word of this. Save money by Ordering planes in groups, Head below! ORDERI DIPPER E-Z TO BUILD--- FLIES 900 FEET! Amazing Dipper costs only 500 postpaid, welghs % oz., takes off ground. Bob Lataa (Cola? flew his Comet Dipper800 eet! Thousands built, flown! Mailed in big. yellow box. Ghder Included FREE. Span, 12 1-2 in,» length, 9 1-2 in. ORDER Now! VOU GET ALL THIS: Jap tissue, balsa ribs, formers.tneignia, wheels bam- ero Mili wire ра, rab, Proh, Баа стт, , arts, - ч dog, clear inatrnetlons. Quick Order fize draw, NEW PHANTOM FURY! 13"x10" This brand-new Terror of The Night Skies is a real big x value at only 50c prep’d! Note sneppy wheel-pants, stream- lined landing gear! į FLIES LIKE THE OIPPER, and even EASIER to build! Beautifully colored yellow and blue. QUICK Be FIRST to hong fly Comet’s PHAN TOM FURY! COMPLETE ''butld- It" plane with ALL mate- tals, FULL-size plans, E-Z directions, In big box_with Free Gitder — Boe! Order bantom in a GROUP of 3, eaves you 25с1 (See Coupon! Postpaid 50c NEW ARMY PLANE! “C-l-Pursuit G _ Made RECORD of 1300 FEET!" ё Like Kowaika of Оро, you can quickly build. fly this offeet! COM- PLETE klt in box with Glider, 75е prepd. Order] g Scale HOWARD ERAGES 750 Feet!" ISc Etherington of N. Y. writes that! Mant This is the fly- ing scale model [xt f TET о тег, color box (and FREE Glide. oin big, “Curtiss Robin FLIES 5 TIMES as FAR es DIPPER!” H. Magni, N. Y. Complete kit of new FLYing Scale Curtiss Robin in big box with Free Glider, only $1 prep'd. 173%” x 14”. Quick! Order! Army fighter hundreds “MY FLYi RACER AVE Paid BABY BULLET LOOKS SWELL and FLIES WELL! "Cummings (Gal.) Here's FIRST FLYing Scale lIeath Bullet sell- “HEATH ing at $1. Trim. speedy! EASILY BUILT. COM. PLETE kit with Free Glider, in big box, $1 prep’d! ‘Order now! New, F-a-s-t RED RACER! SPECIAL! ТН Geen KITS $ new Re Acer kit H in boy is waiting Each in for you! Only $1 Big Box prep'd for every- є thing! Glider Free. Order nowl COMET, 3114 Harrison Dept. MM-23, CHICAGO. *" SEND COUPON! SAVE T5c-Urder GROUPO S tor $3 Put Clrele eround Group No, or Kit wanted. Group 1: Dipper, Pursuit, Red C.O.D. ; Send "Satisfaction Guar- Racer, (2) Dipper, Pursutt, Dod Groups or planes circled. Heath. (3) Dipper, Pursuit, I'll pay C.O.D. plus postage, on ar- Curtiss. (4) Dipper, Howard, tlval. D CASH. Send "'Satlsfactlon Red R. (5) Dipper, Howard, Guaranteed’ Groups or planes Heath. (8) Dipper, Howard, Curtiss. (7) Phantom, Pursuit, Red R. (8) Phantom, Pursuit, Heath, (9) Phantom, Pursutt, elreled below. I enclose $........ cash. Comet pays postage. МАЛЫ.» зке зз aoa aie жаса Curtiss. (10) Phantom, Howard, Street... eee ec rà "— Red R. (11) Phantom, Howard, Heath. (12) Phantom, Howard, „51 secos medie mE Curtiss. NEW 5-COLOR Blake. 2x iiw eres T CATALOG, Зс stamp! D “FLEW 900 FEET" | ANDY'S SHOP MAIL BOX (Continued from page 16) Bob Schoonmaker, of St. Paul, has the baby auto hobby. Above is a job he built. Below is his desk with—what! Packmags?—all over it, and the little Packmag steam en- gine and boiler atop. Note telegraph key and electric motor. Robert Schoonmaker, St. Paul, sends me a very interesting photo of his den. Being a peep- ing Tom as most of you are, I’m running this glimpse of another man's personal effects. The letter: St. Paul, Minn. Dear Sirs: Althougb the above may sound rather for- midable, this should be a friendly letter. After my last rather wordy letter I suppose you thought I'd sink into oblivion (with all the other crabs) but here I am again, and after you as usual. I've long since decided, that the only way to crash into your column is to do or make something that will make others green with envy. I am sorry that your magazine is so specialized that you can only give room to those with big ideas and correspondingly large pocketbooks. Being rather tired of taking a back seat to a lot of would-be inventors, etc., I constructed a car, as per foto. I hope I (Continued on page 20) : + AEA aee e aaa M шш espn ED e 18 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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тө ж a-— AMD Umm ceo = CLEVELAND нъ OH!O-U.S$.A. *""- AUSTRALIA 27 OVERRR 7, GP Wy P7 All the New C = features! $ Remember, you buy directfrom the makers. No middlemen’s profits to pay, You get an absolute guarantee of satisfaction or money back. You try any Midwest 30 Jays before you decide to keep it. Then. if you wish, you can рау in small monthly amounts that you'll scarcely miss. Mail coupon t ti vest Radio Corp.» Cincinna х Du ont етеп: Received the 16-tube outfit. t 3:15 e T k started to £O after Rome ana па few minutes' playing MR е Color-lite dial, Treceived it S tion. This afternoon, $ Pe Get | Pontoise, France (W8XK) 12925 Italy (12-КО) ,Mexico City S DA) Chelmsford, England ( EENAA Have also picked up TVO i x YK2ME (Sydney, Aus tr ү: us br ng, Bye Mance and a, Germany, : d Mick were all coming їп воо Yours very truly, Tout ends 13605 Englesmere Ave., C $ -o Ohio, U.S.A. Member in tional Short Wave Club. i "Юохт be satisfied with less than а big, powerful 16- tube Midwest ALL- WAVEset. A receiver cov» Write ering only half the regular Шог Xu perans, 9n broadcast waves is only half a set. When you own this latest Midwest marvel, with a tuning range of 15 to 650 meters, you can hear regular and short wave broadcasts from all over the U. S. and many foreign lunds. Midwest users from const to coast report picking up England, France, Germany, Italy, Africa, South America, Hawaii, Japan, Australia, the Philippine Islands and many other far-away stations. This powerful, clear-toned, perfectly controlled set opens up new dellghts of radio to every listener. Such selectivity, such sensitivity, such amaz- ingly faithful tone reproduction will delight the most critical. Don’t buy any radio until you get the new 1933 Midwest catalog. Send for it aum Е = today. Mail the coupon or World-Wide Reception! р." ‹ 9... The Midwest 16-tube ALL-WAVE із the last word in radio completeness and efficiency. This latest 1938 sensation incor- porates all the worthwhile new features . . . New type tubes . .. Stat-omit tuning silencer .. . Color-lite tuning ... Ful-floating condenser . . . 18 tuned circuits (Super-hetero- dyne), 9 in cascade... Dual power, two separate trans- formers . . . Large dual speakers . . . Duplex Duo-diode de- tection . . 1 . Class "B" Amplification . . . and many other sensational new refinements and improvements. You'l be & mazed and delighted when you hear one of these wonderful new sets in your own home. Deal Direct With Factory—Save Up To 507 Why buy the costly old-fashioned way and pay two or three profits? Buy direct Ф - at from the Midwest factory and keep the middlemen’s profits in your own pocket. $ Aet aah of e Investigate! Mall the coupon. Learn how we give you a bigger, better, more Г ree powerful, clearer-toned radio at a positive saving of 30% to 50% of usual retail s- ane "i prices. Costs only a stamp tofindout. Mall (ће coupon or write uso postal—NOW! Y We? eon * Let watt P n MIDWEST RADIO CORP. 33," eent een" Dept. 177 {Est. 1920] Cincinnati, Ohio Y os?" pret? Qi - - = igoe Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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Think of it—over 2 million buyers paid $102.50 (cash) for this model No. 5 now offered direct-to- you at way below V2 original price—and on easiest terms besides. Positively the greatest bargain ever offered. Accept the special 10-day trialofferandbe convinced. Seetheneat, perfect workit does—com- pare its bright, shiny newness without risk. Recognized as the finest, strongest typewriter built. 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 price and easiest terms. All complete with modern improvements - - including standard 4-row keyboard, back spacer, automatic ribbon reverse, shift lock, 2-color ribbon, ete. Ideal for business and professional men— teachers, students, story writers, etc. Don't let this chanee pass by. 10 Day Trial You save over $60 by quick action. These gonulne guaranteed Under- woods now only $39.90 (cash) while limited supply lasts. Only $1 down brings the Underwood for 10 days’ trial, If you keep it—only 10c a day Learn touch typewriting free! Complete (home study) course of famous Van Sant System given with this offer. Fully illustrated—easlly learned. soon pays for your Underwood on our new low price and easiest terms. Send at once ‘before this special offer Is with- drawn. Remember every machine fully guaranteed and sent on 10 day trial. REUREIEBERENSENIBEDEENSENSE i Typ 231 W. Monroe St., Chltago, Dept. 205, = I enclose $1 deposit. Send Underwood No, 5 (F.O.B. Chicago) = at once for 10 days’ trial. If I um mot perfectly satisfied I can æ return it express collect and get my deposit back. If I keep it I = will pay $3 a month until I have paid $44.90 (term price) in full. ri =, S МАШО анаа аннараа E Age...... ~ GOCEN "RRORTEBERE Я Address ANDY’S SHOP MAIL BOX (Continued from page 18) can squeeze into your column this way, so please give me a break and print at least one of the pix in your next issue. One is of my cat and one is my den where I am writing this letter. Notice the three Packmags on the desk and the three corresponding projects on the top. Steam engine, telegraph key, and motor (all doing nicely, thank you). Hopefully yours, ROBERT SCHOONMAKER. Another reader has gone and done something interesting. Conversion of the Packard Diesel aircraft en- gine into a two-cycle engine in place of a four- cycle has been accomplished in experiments con- ducted over the past two months by Byron Cudd of Menominee. A model incorporating all of the points of the idea has not been completed, but an experimental engine has been made to work efficiently enough to show the idea to be sound. Mr. Cudd in his Cudd Two-Cycle engine pro- poses to clear the cylinder of exhausted gases for successive firings by permitting the piston. head at the limits of its downward movement to clear the openings of two ports at the base of the cylinder. Compressed air from the super- charger entering the intake valve will then force the expended gases through the ports prior to the upward movement of the piston which will close the ports and compress the fresh air pre- paratory to a second firing. By this means the cylinder is fired at each upward stroke of the piston, thereby increasing the ratio of horse- power to engine weight. The Packard Diesel weighs 510 pounds and at 1,950 r.p.m. develops 225 Һр. The weight per horsepower is 2.26 pounds. Mx. Cudd estimates that a two-cycle engine embodying his idea will weigh 510 pounds and at 1,950 r.p.m. will develop 400 h. p. with a weight per horsepower of 1.27 pounds. A two-cycle Diesel weighing 315 pounds at the same r.p.m. will develop 210 h.p. with a weight per horsepower of 1.50. The Kinner four-cycle gasoline engine weighs 420 pounds, develops 210 h.p. with a weight per horsepower of 2 pounds. Thus the Diesel, with the adaptation of Mr. Cudd’s idea, will be able to develop more horse- One boat builder in Maine has built a class of five Sunrays— the Rab! design which ran in the 1930 How-to-Build-It. Look nice, don’t they? (Continued on page 30) i ———M————————————————————————7HSn 20 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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»»»» JOE MILLER «««« AMERICA’S STRONGEST MAN IN THE 165 POUND CLASS, SAYS "d owe everything to JOE MILLER is the Scrongest 165-Pound Weight-Lifter in the World Joe Miller holds many national records on the Olympic lifts. He has jerked” over 290 pounds and “cleaned” over 300! He says— “George F. Jowett is my ideal = in fact, it is to bim that I owe all my strength and development" What | Did For Him EXPECT still greater things of Joe Miller... one of the greatest weight- lifters I have ever trained, and Joe is only one of thousands who have come to me for instruction and have taken my course in physical training. When І see men like Art Levan, Joe Miller, D. Bachtell, Bob Mitchell and others excell in weight lifting contests whenever they compete, it makes me feel mighty proud! Proud to thinE that there are more than 10,000 men who have taken my course in physical training in the last' four years. Many of the strong man “phenomenons” were boys who сате to meas weaklings... and what I have done for them I can surely do for you! : I know you feel the urge for a strong man's body and I want to tell you right now that Ї can give you mighty muscles too... arms that will ripple with steel bands...a back with powerful blades that will give you а К.О. punch ..,a barrel chestand legsthat will becolumnsofpower for speed and endurance! А physique that men will respect and women admire, So sure am I that I can do all that I say, that I make this unqualified guarantee ... the guarantee that no strong man has ever before DARED to make! ?] will add PINCHES TO YOUR CHEST 2 INCHES TO YOUR BICEPS | <.. Orit won't cost you one penny.. even the postage you have spent will be refunded!" Signed GEORGE F. JOWETT ff While my full course only costs a few | cents a day, I want you to try one of my test courses first... Send tor “Moulding a Mighty Arm" А Complete Course for only 25c It will be a revelation to you. You can't make a mistake. The guaranty of the strongest armed man in the world stands behind this course. I_give you all the secrets of strength illustrated and explained as you like them. In 30 days you can get an unbreakable grip of steel and- a Herculean arm. Try any one of my test courses listed in the coupon at 25c. Or, try all six of chem for only $1.00

eorge SF Jowett”

GEORGE F. JOWETT Holds mare Strength Records than any other Man! George F. Jowett is responsible for such famous weight lifters as Joe Miller,.D. Bacbtell, Art Levan, Larry Campbell, Bob Mitchell and A. Sundberg—ihey are all bis pupils and many of them won great bonors at tbe Olympic Games! | Can Do For YOU! MAIL YOUR ORDER NOW AND І WILL INCLUDE A FREE COPY OF “NERVES OF STEEL, MUSCLES LIKE IRON.” Ir is a priceless book to the енепн fan and muscle builder. Full of pictures of marvelous bodied men who tell you decisively how you can build symmetry and strength the equal of their own. Reach out... Grasp This Special Offer. ‘BOOK. WITH PHOTOS “ОР FAMOUS ‘STRONG MEN я еу ee Агы JOWETT INSTITUTE: of PHYSICAL CULTURE: Dcpt.37 Pb 422 Poplar St. Scranton, Pa. George F. Jowett: Your proposl- ' tlon lgoks good to me. Send. by! return, mall, prepaid, the courses; checked below for which I am en~; closing. Є [Г] Moulding a Mighty Arm, 25е + П Moulding a Mighty Dack, 25c D Moulding a Mighty Grip. 25e ,L] Moutding a Mighty Chest, 25c O Moulding Mighty Legs, 25е

ot Steel, [=] Strong Man Stunt Made Easy, 25e МЕТ FREEL O All 6 Bocks for $1.00. Name Age Address

фи Thank You for Mentioning Modern Mechanix and Inventions Jor February When Writing to Advertisers

up. 21

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96 Models and Sizes Wick 58.25. orld’s lowest priced Automatic oil burner. Thousands In . Belling like wild-fire. Guaranteed. Easiest to install, Ask about this. Bice Flame Burner, Onty 526.00. For cook stoves, T" heating atoves, hamburger FREE course," Dept. 142-B w This Magic Box Turns Spare Time We show you how and give you the corn- plete outfit illustrated above. Also we give you our Free Idea Book which has started hundreds making easy money! Mrs. Н, Lig Illinois, says: "I made $100.00 on furni- ture in one week." Mrs. А. K., Virginia— "My sales were $500.00 {ог five weeks. This is my first year." R. M. P., Illinois— “I did $3,500 worth of business last year and over $12,000 worth this year." D. W., New Mexico—“I would not take $1,000 for my А real desire to make money is all you have to have to make a big success at Fireside work.—No tiresome study— You learn by doing. It is fun decorating beauti- ful gifts and furniture—the most fascinating pastime you can imagine. Practically from the start. you how. Send the coupon for it! No Experience Needed You need no experience or business ability to succeed at Fireside work and make ex- FIRESIDE INDUSTRIES Adrian, Mich. SENSATIONAL ANNOUNCE- MENT! Now...for Half Price you may enjoy the comfort and economy of Automatie Oil Heat й save heating drudgery and World's greatest oll burner offered at Amazing New Low Price. Bullt and guaranteed 26 years by largest exclusive oli burner manufacturer. Wonder heater . . . operates for much less than coal . . . burns cheapest olls (and 24 West Coast Diesel oil.) Quiet. Clean. Safe. BURNS OIL NEW WAY LACO'S famous Quiet-ized Flame ү of extra cost—send " the coupon for de- tails of our amazing new plan. It tells you how to get a big assortment of beautiful gifts that you can paint. You make good money Our FREE book tells Terrific Price Slash Gives H on Famous LACO Atomizing Power Burner Into Money cellent money. We help you and show you how. You can join now on the easiest plan ever offered. Get full details today. Coupon brings everything. FREE Book on Decoration Mail the coupon NOW for the beautiful new book on home decoration and money making. It's FREE! A new plan for starting you at good топеу at once will also be included, Do this at once—while there are open- ings for new members! Fireside Industries Dept. 142.B Adtian, Mich. Send me FREE book on decoration and details of your new plan. Also how to Eet the big artist's outfit. Wholesale Æ Price uge Saving MANY NEW FEATURES Fully automatic, Complete with thermostat AGENTS, DEALERS and stack switch. Operates without atten» Send for details of tion. Maintains uniform temperature. Safest BURNER known. Carries Underwriters Lab. approval. Many exclusive improvements . . . powerful, OFFER І new pseking-lesag pump—radio-proof coil—in~ destructible all-braes tubing—new eteel longe life electrodes. Only 1 moving part. Easy to i l in any heating plant. Sensational Free Burner offer starts you out! Make $500 to $1000 & month GUARANTEED FOR without Sxperienes. v me inter- LIFETIME ested” in “guaranteed Ii, in 25 years, burner faila to glve perfect B&tisfaction due to defective manufacture, we protect you fully, 30 DAYS' FREE TRIAL Try it, FREE, in your own home. You muet, LACO at Amazing New Low Prices. 26 models and sizes suit eem need: Valuable factory he ven. Start NOW a griddles, Opera uses amazingly Ше fuel. Every be satisfied, or you need not keep burner. LACO in your own pn leas then Jo an ш pertiele of heat extracted from every N/RITE[ Send, NOW, for free Бооке, | home, at our risk. Heavily built, Guaranteed. rop of oll. Improved diffuser mixes wholesale po Give ting of home typs | Bend TODAY! oll and alr orougn! nc 10260662 heating plant, SEND TODAY. Lo lity oll Я a slow spiral flo: Mer uid ршен, Бели, Suspenslon. Much more efficient L A с о о і L B U R N E R C о stoves, jAtcolan, smell furnaces: than деше жеп ehoots through a eat, Safe. i , uj е Now selling, low as 39.60 the duimney, 987. wis e^ 003 Union St Griswold, lowa, U. S. A. rohit їрє. 22 Thank You Jor Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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Why on —when уои can learn to play at home without a teacher ON'T let 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, fundamental 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 a 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 play, and the U, S. School of Music wil do the rest. And re- member—no matter which in- strument you choose, the cost in each case will average just the same—only а few cents CHOOSE YOUR COURSE Plano Piccolo Organ "Cello Violin Sight Singing Drums Ukulele Hawallan Steel Guitar Mandolin Clarinet Harp Flute Cornet Saxophone Trombone Volce and Speech Culture Harmony & Composition waste time old fashioned methods Easy as A-B-C F A С| Е If you сап read the alpha- bet you can learn to play your favorite Instrument In just a few months. Free Book and Demonstration Lesson "How You Can Master Music 1n 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 те and at a fraction of the cost of old, slow methods—the U. S. School way. The book- let nad also tell you all about the amazing new Automatie Flinger ontrol. 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. Instruments supplied when needed, cash or credit. U. S. SCHOOL OF MUSIC, 2622 Brunswick Bldg., New York City. Thirty-fifth Year (Established 1898 ) U. S. SCHOOL OF MUSIC 2622 Brunswick Building, New York City Please send me your free book, "How You Can Master Music in Your Own Home,” with inspiring message by Dr. Frank Crane, Free Demonstration Lesson, and particulars of your easy payment plan. I am Interested in the following course— Пате you Automatic Finger a days; L 05 раа аран Mie Mea instrument?........ Control You'll never regret having Plano Accordion learned to play. For those А Itallan and German who can entertain with music KAME sse Sie seit sia Bea) dre YI UE wi жа dinis xs UE аваа ааа ЕЕ » Accordion at parties—who can snap up things with peppy numbers— Banjo (Plectrum, 5- are always sought after, al- Address ........... "—————— String or Tenor) ways sure of a good time! Juniors' Plano Course Start now and surprise your friends! [o — M ———— T0 — berkemas А e e ae m Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 23

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[THIS ELECTRIC TEL DOT 'N' DASH SENDING & RECEIVING Complete with MORSE CODE T end Directions for Operating wooden base, and full printed instructions. ON EGRAPH SET 15c BOYS! Have a private telegraph system of your own! Lots of fun sending messages to friends. A very reliable outfit ihat sells for 15e. Get two sets, us- ing one for sending and the other for recelving. With this outfit you can learn to transmit and re- ceive messages by the Morse International Code, and in a very short time become an expert operator. Measures 4 x 3 inches, first class construction throughout, complete with key, sounder and magnet, Morse Code printed on LY 15е each set postpaid. JOHNSON SMITH & CO., Dept. 919, RACINE, WIS. ONLY 10c ; Per Pair Fighting Roosters "With very little practice you cun make theso miniature modela of Game Roosters imitate in the moat life-like menner the evolutions of & FIERCE COCK-FIGHT. Endless amusement. Well made, with real feathers. Ра! 10c. З рга. 25c. postpald. MIDGET BIBLE GREAT Ч ‘CURIOSITY gm BmaliestBible In the World. Size of в post- nge stamp. 200 Pages. id to bring коой luck to = the owner. А i genuine work E eel of art. Must — be seen to be appreciated. Make good money selling them to friends, church acquaintances, sto. PRICE 15c ench, 3 for 40c, 12 for $1.35, 100 for $7.50. Also obtainable li Leather Binding, with gold edges. Pri tor $1.25, $4.50 per do: S for use with Midget Bib! SERPENT'S EGGS Box contains 12 eggs. When ge lit with a match, esoh one gradually batches itself into a enake sovaral feat long, which curls and twists about in a most life-like manner . =, Price per box. {Ос pos Very striki Withabunoh of these bills, it 18 easy for each person of limited means to appear prosperous ! y fashin ү! ART а rollo à А) Жс these bills р å S) at the proper time and peeling off а genuine bill or two from the outside of the roll, the effect created will be found vo be all that can be desired. Prices, postpaid: 40 Bilis 20c, 120 for 50c, $3.50 thousand postpald. or NOSE FLUTE The Mazio Nase Flute, or Bu novel mui is played with nose and mouth combined. There is just a little knack in playin it which, when once ac: quired after a little prac- tice, will enable you to produce very sweet 10c music that somewhat resemblee а flute, There ів no fingering, and once you have mastered it you can play all kinds ol music with facility апа ense. JOHNSON SMITH & CO. Post ` Paid GOOD LUCK RING [2° Exploding Cigarettes Bor contains ten genuine cig- g, when saa one-third smol 7 gets a very great @urprise ns lt goos off with ud BANG! А great mirth pi ker yat en- tlrely harmless. Price25c box. More fun tban fghting with your( 13 € the victim wife. Look just like ordinary %& matches. Ав the e victim tries to light 10 one ће geta quitea 40C surprise, e Price 10с per box, 3 boxes for 25c, 12 lor 75 cenle. STAR TOY MAKER Greatest boys’ book written. Tella how to make в Pinhole Camera, a Canoe, model Railroad, a Tel phone, Boomerang, Tele- raph Instrument, Box ite. Talking Mac М1стовсо Р pI ec a (А otor. Electric Door Bell, Water Wheel, Paddle Raft, а palr of Skis, а Dog Sled, Bird House, Rabbit Yard, et 64 peges, 150 illustrations. PRICE 1 BOY'S OWN TOYMAKER. A new book. Telle how to make chemical toya, electrical toya, galvanio toys, mechanical toys, paper toye, cardboard toys, boats, traps, eto. 200 illustrations. Price 250 posipald. FUN WITH MAGNETISM. 50 novel and е experiments in MAGNETISM that E you can perform with the {Waray aid of en ordinary magnet: magnelio chain. seing wd 2070 spinning needle, nail an ч bal cluster, magnetic fish, top, motor, magnetia billiard balls, many other Stunts, Also inieresting information about 1одевѓопе, magnetism, eleotrio ty, ete. PRICE 10c p.pd. BOOK ON BOATS. How to build rowing, sailing boate. Xverythlng pertaining to boots explaincd In plain terms во anyone osn under- stund, Illuslrated. 10е p.pd. A G-MINUTE HARMONICA COURSE. new easy self-teaching method. Teaches how to play, to use the tongue, tremolo, fully illustrated, Price 15c postpaid. MONEY MAKING SECRETS. Golden oppor- tunities for everyone. 64 page copyrighted book chock full of money-making Ideas, recipes. formulas, wrinkles, trade secrets, ete. Busi- nesses that сап be started with little ог nn capital nt home in spare time. 10c postpal TRICKS & SOCIAL ENTERTAINER. taine hundreds of simple tricks, illusions, veralons that anyone can do. Alao explains secret of eecond sight. Price 25c postpald. WONDERFUL X-RAY TUBE A wonderful little] instrument pro- ducing optical illusions both surprising and Startling, With It you can see what is apparently the bones your ngere, the lead in lead pencil, the terior opoolog in & рі tem, d many oth. milar Шовіопе. P. for 256. JOHNSON SMITH & CO. CATALOG Dept. 919 RACINE, WIS. A De Laxe Edition of 0071933 CATALOG malled on receipt of 250. Address orders for all goods on above and on following page to Johnson Smith & Co., Dept. 919, Racine, Wis Thank You јог Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 24 nd better than e niy book of its kind la t ыры in magic, the newest ul па unprocurnb! Check or unused U. 8., Cani tod above. See next page also. ‘down etairs, around corners, eto. AY г | j ‹ А Real Telephone. Works Indoors or Outdoors. 100 ft. or 1000 ft. Though this je merely в very clever toy, it je quite аз serviceable for Short, distences вв the most elaborate apparatus made and it їз much less liable to get out of order or to need adjustment; in fact it cannot be rendered efficient unless roughly handled. No troublesome battery, no intricate ook-up.” Сап be put to practical use from one room to another, up ог ai The palented sounding disca tranemit and receive the voice perfeclly, making it a really practical talking tele- Phone. Get consiats of two phones, tranemlseion cord and full instructions. PRICE ONLY G5c per set postpaid, JOHNSON SMITH & CO. Wonderful Instrument. Greatest thing In one. Everybody de- lighted with it. Odd, Curlous and interest- ing. Lots of pleasure as well аз very useful. It Is a double Microscope for ex- amining the wonders of nature, Jt fe also an Opera Glass, & Stereoscope, a Burning Lens, a Reading Glass, а Telescope, a Compass, @ pocket Mirror, and a Laryngoscope—for examining eye, ear, nose and throat. It 18 worth all the cost to locate even one painful cinder in the eye. Folds flat and fits the pocket. Something grent—you need one. Don’t miss It. Sent by mall. Only 35c or 3 for $1.00. PISTOL CIGARETTE CASE| It looks Ilke a deadly weapon, but 1t Їз merely a novel Cigarette Case, This clever contrivance E has proved itself better than the real thing In many an awkward encounter. Great fun “sticking up" your friends, They squirm and protest it might be loaded, Pull the trigger and the slide files E open disclosing the ciga- q rettes. Well made, light wand сот раст. Weight fore everye only 2 ounces. PRICE ev POP 35c MICROSCOPE and FLOROSCOPE COMBINES ALL THE POWER AND DEFINITION OF THE MORE EXPENSIVE MICROSCOPE SURPRISINGLY GREAT MAGNIFYING POWER - EXAMINE GERMS IN WATER, CHEESE, GUGAR, ETC. Bendat ence Y and havo ati Gio FUN be "There are few things eo interesting end valuableass @ Microscope. It enables you to minutely exem; mineral anima) and vegetable specimene, to test colton, wool, silk, seede, water, flour, checse, milk, and in fact meerly 011 articles of food. Unwholesomo mest can readily detected and ferments can be closely watched. It ie exceedingly interesting to examine the spores of ferns, soda, suger, ealt, alum end other cryetele, the dust (scales) from moth end butterfly singe, human haire, flies and ineects, while the animaleulae in water Bre a never-lailing source of wonder. Most interest- ing exporimente сар be performed with an instrument Buch as this. Place a small piece of cheese in в box and allow inseats to feed on it fora day or two. Then examine в tiny portion of the cheese under the Mi- eroscopa and you wlil see little animals, magnified to the size of large beetles: you can count their legs and the jointe in them, the talons or claws upon each foot, also the hair or bristles upon their bodies. Or, obtain some stagnant water; deposit n emal! portion of scum upon the object glaes of the Microscope with в pin's head, and you will see beautiful enimalculae swimming Bbout wilh ва much freedom аз though they were fish in the boundless ocean. It is a truly wonderful sight 6nd an endless eource of interest and enjoyment for every . The Microscope із made of brass and is дараһ1е of magnifying 160 areasand although ema]! and compact, It will cover a very wide range of microscople research. Price only 59c Post- paid. JOHNSON SMITH & CO. Dept. 919 RACINE, WIS. TELL YOUR OWN FORTUNE| - With the aid of this dream book and for- you be lucky in love? Successful In busi- ness? Will you be wealthy? Complete with dictionary of dreams with descriptions and tune-teller. The key to your future. Will | correct interpretations, with lucky num- & bers, fortunate days, orocles, divinalion, E palmistry, ete. Also tells how to tell Ё fortunes by varlous methods, by grounds E of coffee or tea, by dominoes, by marks, E т * scars or moles, miscellaneous games with B cards, lucky days, weeks, months, years; how to гессіте oracles by dreams, finger nail observations, etc. PRICE [0c postpaid. E FORTUNE TELLING BY CARDS! 64-page book tells how, Gives the meaning of each and every card, how to deal and lay them cut. Everything explained in simple language. [0c postpa

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"You ean easily make a highly penaltive detectophone by’ using this Transmitter Button to collect the sound waver You can build your own outüt without buying expensive equipment, It is simple and inexpensive: оч ean install ец outfit in your home end hear conversations being held all over the house. You can connect up different rooms of a hotel, This outfit was uscd by secret service pperaitives dure £ the wor. Ib is being used on the stage, Tt is ultra-sensi- ive and 1s the greatest invention in micro-phone& You can ount the button almost anywhere—catd board boxes, stove ipes; ӨЫ calendars, on the wall behind & picture iframe, ete. utiom is во lizh and small it cannot be detected. Persona can be overheard without euspecting it, You can listen in on conversations im another room, А deaf person in the audience can hear the ег; Connected to phoporreph; piano or other musloal instrument, music can heard hundreds of (eet away. Button may be used to renew telephone transs milters; often makes an old lino “talkeup” when nothing else will The idest microphone for padio use; carries heavy current and js extremely sensitive; Amplifies radio signale. Countless other similar ams will suggest themselves. Experimenters find the Button useful for hundreds of experimenta along the lines ој telophonce, amplifiers, loud speakers, eto. Many {ascle ating stunts may be devised, such ns holding the button against the throat or chest to reproduce apeech without sound waves, $5.00 iveu to anyone who sende in a mew suggestion for the use of tho Button Баат the manufacturers find it suitable for use in their literature. PRICE $1.00 POSTPAID ANYWHERE, BLANK CARTRIDGE PISTOL Tole well id aye PRICES on the pattern кин. | of the latest type of Re- volver, the ap- pearance of which alone is enough to scare a burgler, whilst, when loaded, it will probably prove just as effective аз a revolver withreal bullets, without the danger to life. It takes the standard .22 Calibre Blank Cartridges, that are obiainable most everywhere. Even the most timid woman can use it with perfect safety and frighten a thlef without risk to herself or anyone else. А Great Protection Against Burglars, Tramps and Dogs. You can have 1t lying about without the danger at- tached to other revolvers. PRICE ONLY 50 CENTS. Better maka and supertor quality for $1.00. Blank Cartridges .22 cal., 50e per 100. Cowboy type Holster 500. Not prepald. Shipped Express only. JOHNSON SMITH & CO., Dept. 919, RACINE, WIS. i SILENT DEFENDER Used by police officers, detectives, sheriffs, night watchmen and others as a means of self-protection. Very effectlve. Easily fits the hand, the fingers being grasped in the four holes. Very useful in an emer- gency. Made of aluminum they are very light, weighing lees than two ounces. Handy pocket size always ready for instant use. Price 25c each, 2 for 43c postpaid. MAKE YOUR OWN RADIO RECEIVER Enjoy the concerta, baseball games, This copyriented boos EREÍCYENT s copyrighted book'* NT RADIO SETS” shows how to make and operate in expensive Radio Sets, the materials for which can be pur- chased tor а mere trifle. Also tells how to build a short-wave Receiver for bringing in foreign stations, police call ps at sea, etc. ONLY 1Sc, postp REPEATING AND SINGLE SHOT AIR PISTOLS 180 Jokes and Riddles, 21 Puzzles and Prob- lems, Gypsy Fortune Teller, 50 Money Mak- ing Secrets, 36 Experiments in Magic, 59 Verses in Comic Poetry, 7 Parlor Games,16 Card Tricks, 10 Funny Readings, 71 Toasts, Cut-outs for Checkers and Chess, Domi- noes, Fox and Geese, 9 Men Morris. Ana- grams. etc. Ali for iSc. Postpai Just what you've always wanted. powerful high grade Air Pistol, shaped like &n Automatic, pocket size. Fires B. B. shot obtainable апу» where; Very powerful yet perfectly safe for boys to le. Two styles incle Bhot Pistol or Repeater. The Repeater fires 50 shote in one loading. The Singlo Shot Pistol ehoote Air Rifle Darts in ad- g dition toD. Shot. Well pade and durable: s eli ш parts nickel pisted; natural grain wood stocks. end reat olghtas M about 10 оппаа Better an en air сібе, No licensa require PRICES: Single Shot Pistol 152.75, 50 Shot Repeating Pistol 53,95. Not mall- able. Shipped by Express only. Not prepaid. Send remlttance (Postage Stamps accepted) for all articles listed above, also in our other ad on previous page JOHNSON SMITH & Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers BOYS! BOYS! ROW YOUR VOICE a Into a trunk, under the bed, x “S under a table, back of the door, into a desk at school, or any- А4 where. You get lots of fun fooling the teacher, policemen, , j peddlers, and Pu werk and fool all your friends ides, is a little instrument that fits In the mouth out of sight. Cannot be detected. It Із used in connection with the above, and with the aid of this wonderful DOUBLE THROAT, or VENTRILO, you ean imitate many kinds of birds, animals, etc. Remember you get everything for ONLY TEN CENTS—a booklet giving you full instructions how to become a ventriloquist and throw your voice, the Double Throat, or Ventrilo, and our big catalog of novelties, tricks, puzzles, masks, books, etc. 1 0c All Sent Postpaid te Any Address for Only MAGICIAN’S BOX OF TRICKS Apparatus and Directions for a N piricus Trick Enough. for n ys зрее of. Pye: Entire § Evenings $ 00 BW-ANYONE CAN DO THEM It is great fui ву š t this Conjurera Cabinas aba you will be thi cleveresi low in your district. It containa the appa ‘atus for ten first-class tricks, inolud« бкл рүшү RS Кр аре ЫЗДЫ Hei d o ап 1] ENG COIN BOX ( cola, placed i 5 of another denomination); T! LABS GOB- LET TRICE in іа dropped into a glass of water and when the water is poured ont the gola bas vanished and Js found somewhere sise): the RIBBON FACTORY FROM (MOUTH TRICK (e scomingly endless supply cf colored paper ribbon comes acp p CEU Sq cs CHANTED BOTTLE (ao one but yourself ig able to x lay down); tha GREAT af it lay down): the GREA. HAT AND DICE TRICK (а large dice ia placed ба top oi a bat deere ae i t not he GREAT. PHANTOM САК гог two [rom Avo | к. Pull inotruoti sent for performing aach trick. In addition to the above. a number of ph rer {ема and luslons are fully explained for which you can easily make or procure 6 neccessary аррвгаёшщ. Price ёо! $1.00 postpald. JOHNSON SMITH & CO. BOY ELECTRICIAN ©! Beok кг boss 10g Past Students, Etc.—Oni The HOW and WHY of electricity fully told in simple language М thet any boy can understand. Scores of plans end instructione for aN making—dry batteries, dynemos, electrio motore, telegraph apparatus, 2 telephones, electrio lighta, electric door belle, alirme, elertria engine, rheostat, mall box elarm, eleciro-magnete, Aulomatio ineandescent flash, electrio ehocking machine, witeless telegraph apparatus, induction coil, arc light, current reverser, etc., eto. Tells all about electric wiring, stutle electricity, magnets and $ Inagnetiam, conductors and insulators, electrostatio in- duction, the electroscope, the electroph deneers, the Leyden jar, dynamic electri yoltaio cell, eleciromagneta, electrolysis, el ing, electrotyping, ete. Aleo tells how to build в radio receiving set for а [ew cents. Nearly 100 illustrations. Sent postpaid to any address on receipt of ONLY 10c, coin or stamps. Dr 250 MAGIC TRICKS found underneath EET has touched the hat), and lai For Parlor or Stage An excellent litile book contninlng neerly 300 Tricko for parlor or stage. Tricks with cards, eoine, handkerchiels, erge, rings, glasses, flowera, thimbles, вроопа, bottles, string. Explains the mystery of the floating head and scores of other smazing festa of magic and illusions, Also Becond Bight, Bhadowgriphy, еіс. So simple a child can perform them. Profusely illustrated. ONLY 100, — A a te eel ad 325 CARD TRICKS and sleight of hand. Cone tains all the latest and best card tricks &3 performed by celebrated magiolans, with exposure of card tricka used by professional gamblei e 250 little Wonder Crystal Radio Receiver $1 Say what you will about Electrical and Bat- MES tery Sets, a CRYSTAL set has them all beat m for simplicity and clearness of tone. There is absolutely no noise and no distortlon—no bat- teries to buy—no tubes to wear out—no main- tenance expense whatsoever. Cost nothing to operate and will Iast indefinitely. Reception is loud and clear. This Receiver guaranteed to work equal to the most expensive Crystal Set you can buy. Has a receiving radius of over 25 miles, or under farorable conditions up to 100 miles. Constructed of the finest materials throughout, including supersensitive crystal, assuring quick results. PRICE of Receiver only $1.00 postpaid. Or complete with Ear Phone and Aerial Kit—everything all complete— nothing more to buy, $2.95 postpald. CO. "si Racine, Wis. 25

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AVIATION SB PROPELLERS give better per- formance. New Special propeller for Henderson and Heath motors, diameter 5 ft. Hardwood only, $18.00 each. Send stamp fer new propeller circular and prices on other sizes. Sensenich Broth- ers, Lititz, Pa. BUILD Corben Baby Ace, complete kits including factory welded fuselage, tail unit, under carriage. Folder, dime. Cor- ben Sportplane Co., Madison, Wis. METAL Tipped Propellers; Fords, $9.98; Henderson, $8.98; Harley, un- tipped, $4.50; New Improved Heath ships, $298.00; Bristol Cherub Tupe 40 H.P. motors, $75.00. Photos, informa- tion including leather bound Flying Manual, 25c. Hibbs, Ft. Worth, Texas. BE PREPARED in aviation for the next boom. Write for new home study tuition offer. Major Robert Rockwell, Dayton, Ohio. USED Airplanes, $50 and up. Catalog 10c. Federal Equipment Co., Deerpark, Ohio. ICEBOAT Propellers—Harley, Hender- son, Fords, etc., $6.00, up. Iceboat $18. Lightplane $115.00; pictures 5c.— Edw. Schille, West Bend, Wis. A NEW Book on Motorless Flying. A B C of Gliding and Sail Flying, by Major Victor W. Pagé. This book has been prepared to meet the demand for a simple, practical and inexpensive trea- tise on modern Gliding and the data has been carefully collated and prepared with special reference to the needs of young people and beginners in aviation. The leading types of Gliders and sail- planes and their construction, control and launching are described. Instruc- tions are given for forming a glider club and for building a strong yet simple pri- mary glider, including working draw- ings. 200 (6x9) pages. 72 illustrations. Cloth. Price, $2.00. Modern Mechanix and Inventions, 529 South Seventh St., Minneapolis, Minn. BIRDMAN Wings, aviation’s newest sport, full details how to build, theory and practice $1.00. Lay, Blueash, О. PROPELLERS Repaired at reasonable prices. Write us fully extent of damage. Free advice. Expert work. Lorenzen Propellers, Niles, Mich. ADVERTISING ADVERTISING! 20 words, 50 maga- zines. 60 cts. Three insertions $1.20. Nacogdoches Advertising Agency, Na- cogdoches, Texas. AGENTS 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 particulars and free sample. American Monogram Company, Dept. 11, East Orange, N. J. MEN WITH CARS to handle Home Service Branches of new kind “Chain Store" System. Supply steady customers on regular route. Must be satisfied to make $27.50 a week at start. Write Albert Mills, 3700 Monmouth, Cincin- пай, О, cbt 26 Classified Advertisements Rates for classified ads, 15c per word per insertion, or.12c per word per insertion for six insertions. Minimum 10 words. Cash should accompany order. Issue. Address Classified Mgr., Modern Mechanix and Inventions, 35 East Wacker Drive, Chicago, III. | MAKE your own products. Employ Agents yourself. Toilet articles, soaps, extracts. We furnish everything. Valu- able book Free. National Scientific Lab- oratories, 1964 Broad, Richmond, Va. FREE Booklet describes 87 plans for making $20-$100 weekly in home or office business of your own. Elite Co., 214-G, Grand St., N. Y. BIG Money Applying Gold Initials on automobiles. Easiest thing today. No experience needed. $1.45 profit ever $1.50 job. Free samples. "'Ralco", B1084 ashington, Boston, Mass. FREE Literature describing many money-making plans. D-Belfort, 4042 N. Keeler, Chicago, AGENTS WANTED YOU ARE wanted to resilver mirrors at home. Profitable business plating auto parts, tableware, еіс. Write Sprinkle, Plater, 850 Marion, Indiana. AGENTS’ Gold Sign Letters for store windows, 500% profit. Free sample. Metallic Letter Co., 426 N. Clark, Chicago. 5 MAKE your own products, Employ Agents yourself. Toilet articles, soaps, . extracts. We furnish everything. Valu- able book Free. National Scientific Lab- oratories, 1964 Broad, Richmond, Va. SENSATIONAL new Magic Polishing Cloth cleans all metals. No paste, pow- der or liquid. Quick 25c seller. Big profits. Free sample and catalog of many other quick selling Magic Prod- ucts. Magic Mfg. Co., 1018B E. 75th. Way. Kansas City, Mo. STRANGE Chemical Sponge cleans walls like magic. Banishes houseclean- ing drudgery. Women amazed. Agents cleaning up. Outfit Free. Kristee Mfg., Box 2491, Akron, Ohio. AIRCRAFT LUMBER SPRUCE--Finished to size for air- planes, gliders, iceboats. Highest qual- ity, Lowest prices. Mail sizes for quo- tation. Pike-Dial Lumber Co., 2261 Loomis, Chicago. ASTROLOGY WORRIED? Wondering—What 1933 holds for you? Changes? Success? Love? Travel? Position? Stamp, birth- date brings details. Caloscope, 2077 М66, Atlanta, Ga. BUSINESS OPPORTUNITIES TATTOOING outfits supplies, illustrat- ed list free. Waters M-965, Putnam, Detroit. OPERATE Chain amusement machines. Be independent for life. Start small, grow big. М. Goodbody, 1826 East Main St., Roches- ter, N. Y. COMPLETE Chemical Service. Analy- sis, Formulas, Consultations. State Licensed Chemist. Twenty-five years’ experience. Write for literature. W. L. Cummings, Ph.D., 428 Gordon Avenue, Syracuse, N. Y. AMATEUR cartoonists, earn $25.00 week, spare time, copying cartoons for advertisers. Three-M Syndicate, Argyle. Wis. of vending and Closing date 20th of third month preceding date of ARTIFICIAL marble sanitary flooring, instructions covering wood or cement flooring 74 inch thick, fireproof, all col- ors, low cost. Ornamental casting, con- crete plaster, papier-mache decorations, garden furniture, statuary, flexible molds, particulars and illustrations free. W. Mahler, Elmont, N. Y. 700 MONEY Making Secrets will help you start a business of your own. Write Illinois Universal, 800-M, N. Central Ave., Chicago. 10,000 SELECTED scientific, chemical, technological, and practical recipes aud processes, including hundreds of so- called trade secrets for every business, alphabetically arranged in one large vol- ume of 800 pages. Price $4.00 prepaid. Modern Mechanix and Inventions, 529 S. Seventh St., Minneapolis, Minn. THE PLASTEX Industries needs man- ufacturers on small scale and for big production of Art Goods, Novelties, Souvenirs, etc., in Plastex and Marble imitation. Experience unnecessary. 5c material makes $1 articles, Rubber moulds furnished for speed production. Small investment brings big returns. Big X-mas orders now being placed. Interesting booklet mailed free. Piastre Industries, Dept. R, 1085 Washington Avenue, New York. $5,000.00 YEARLY! Raise Bullfrogs for us! (Your backyard.) We start you with breeders, instructions and buy all you raise. American Bullfrog Indus- tries. 100-MM. Fremont, Ohio. MAKE your own products. Employ Agents yourself. Toilet articles, soaps, extracts, We furnish everything. Valu- able book Free. National Scientific Lab- oratories, 1964 Broad, Richmond, Va. SUCCEED with Your Own Products. Make—Sell them yourself. Formulas, Processes, Trade - Secrets. Analytical Service. Catalog free. A. Thaxly Com- pany, Washington, D. C. MAKE Artificial Marble, colorful, glos- sy tiles, no polishing, rather uncanny. Novelties, tabletops, bookends, floors, whetstones. Hard, inexpensive, fire- proof, enamels wood. Secret cement methods. Amazing samples 3c. John H. Payn, 945 Grande Vista Drive, Los Angeles, Calif. AUTOMOBILES THE CHEVROLET SIX Car and Truck. The book is written in simple, non-technical language, and it is espe- cially valuable to Chevrolet owners who maintain and repair their own cars, The general repairman will find many short- cuts explained for repairing all parts of the car, and various special tools and fixtures are described in detail to facilitate the work. The latest synchro- mesh and free wheeling transmission is explained in detail and illustrated with clear and distinctive drawings showing all mechanical parts with the compo- nents indicated by plain, descriptive let- tering. Ali 1932 improvements fully described. 489 pages, 150 illustrations. Price, $2.00. Modern Mechanix and Jn- ventions, 529 South Seventh St., Min- neapolis, Minn. apre Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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p———————————MÁÓ————————— rr — Qd! BUSINESS OPPORTUNITIES CORRESPONDENCE SCH. COURSES HOME WORK that pays. With our new composition make and sell novel and useful articles and toys that are beautiful. Materials cost very little and no expensive equipment necessary. Ten cents brings select samples and illus- trated literature. Address L. Parker, Lock Box 555, Grayling, Michigan. BUILD Profitable spare time mailorder business! Read ''Mailtrade Tribune," 5c. 1507E 69PL, Chicago. BLUEPRINTS BUILD your own bench shaper for home shop or commercial machine shop. We supply complete blueprints and rough castings. Send for free descrip- tion and price list of parts. P. W. Cor- nelius, 2457 E. Washington St., Indian- apolis, Ind. BOATS MINIATURE Boat Building—Written to interest the expert—Amateur—Stu- dent. A concise and complete treatise written in understandable language cov- ering marine model making in general, the history of model making and the specific design and construction of the models of eleven famous racing sail and power boats. Illustrated with scale drawings and 500 progressive pictures. 242 pages, 500 illustrations. Price $3.00. Modern Mechanix and Inventions, 529 S. Seventh St., Minneapolis, Minn. BOOK PUBLISHER ABSOLUTELY new vital health se- crets disclosed. Amazing results guaran- teed! Write! Vitalis System, X-1214 East Colorado, Pasadena, Calif. CAMERA 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 Photography, Dept. 2049, 3601 Michi- gan Avenue, Chicago. CHEMICAL BOOKS NINE popular chemistry booklets con- taining over 225 interesting chemical feature articles, fascinating chemical experiments, valuable formulas, etc., $1.00 postpaid. Popular Chemistry, . M, Swedesboro, New Jersey. CHEMISTRY HOW to Make and Use a Small Chemi- cal Laboratory. By Raymond Francis Yates. The treatise covers all of the essentials of elementary chemistry. The law of definite - proportions, solutions, crystalloids, colloids, electrolysis, etc., are explained. The second part of the book is devoted to chemical and electro- chemical experiments. Only those ex- periments that will tend to broaden the reader’s knowledge of chemistry in gen- eral have been chosen. The third part of the book describes the construction and fitting out of the home laboratory. Directions for the construction of the many simple pieces of Chemical appa- ratus are given. A chemical balance, ringstand, electric furnace, etc., are de- Scribed in detail, with working draw- ings. The manipulation of Chemical glassware is also treated. 102 pages, 41 illustrations, bound in paper. Price, 75 cents, Modern Mechanix and Inven- tions, 529 South Seventh Street, Min- neapolis, Minn. CO!NS and STAMPS KEEN Kollectors Krave Kolonials: 100 different, 20с. Unused stamps accepted. Imperial Stamp Co., Allahabad 94, India. DETECTIVES DETECTIVES earn big money. Excel. lent opportunity. Experience unneces- sary. Particulars free. Write, George Wagner, 2640-V Broadway, N. Y. * II Thank You jor Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers USED Correspondence School Courses. Inexpensive, quick, К. E. Kelley, Stur- gis, Michigan. EDUCATION AND INSTRUCTION EDUCATIONAL Books, Correspon- dence Courses Sold, bought, exchanged. 10,000 bargains, catalogue, 6c. Educa- tional Exchange, 7315 Middlepointe, Dearborn, Michigan. ELECTRICITY ELECTRICITY for Beginners, E. Har- per Thomas. 196 pages, 24 illustrations, $1.50. This is exactly what the title im- plies, a real elementary treatise. Pre- pares the reader for a more advanced study of the subject, and considers and explains many of the common terms and everyday manifestations of electricity. House Wiring, by Thomas W. Poppe. Describing and illustrating up-to-date methods of installing electric light wir- ing. Contains just the information needed for successful wiring of a build- ing. Fully illustrated with diagrams and plans. It solves all wiring problems and contains nothing that conflicts with the Rulings of the National Board of Fire Underwriters. Including Direct Current Motor Connections—Diagrams of series wound motor—and Motor Wir- ing. 208 pages, 160 illustrations. Sixth edition, revised and enlarged. Price $1.00. Modern Mechanix and Inven- tions; 529 S. Seventh St., Minneapolis, inn. ELECTRICAL GOODS ALL KINDS electric motors, generators, compressors, grinders, fans. Very rea- sonable. Superior Electric Company, Dept. M-21, 4526 N. Leavitt St., Chi- cago. FARM LIGHTING BATTERIES EDISON Lighting Plant Storage Bat- teries. Non-Acid, Non-Sulphating. Odor- less. Guaranteed 15 year life. Free Literature. See Jay Battery Company, HA Sterling Avenue, Yonkers, New ork. FOR INVENTORS INVENTORS MAGAZINE! Just what's needed! Hundreds inventions ad- vertised, sale, wanted. Valuable trade information. Necessary. Useful. Inter- esting! Patent Sales Features! Recom- mended. Patent Application Depart- ment. Details; copy 20c. Year $1.00. Manufacturers, Inventors, communi- cate, “Inventive Age—Patent Market”, 819-H, 80 Wall, N. Y. HAVE you an idea? Want it patented? Financed? Manufactured? Promoted? Sold? Want Action? Address, Patent- fax, 1571-H66, Atlanta, Ga. HAVE you a sound, practical invention for sale, unpatented or patented? If so, write Chartered Institute, 570 Barrister Building, Washington, D. C. Fal al enk LM a a M FOR SALE GENUINE Tungsten distributor levers and screws for Ford Model A—AA at 40c per set. Stanley Brach, 83 Belcher St., Chicopee Falls, Mass. FORMULAS HENLEY'S Twentieth Century Book of Recipes, Formulas and Processes. 10,000 trade secrets, practical recipes, chemical processes, money making for- mulas. There is nothing published that will take the place of Henley’s Formula Book. You may have Encyclopedias, Household Recipes, Trade Manuals and all sorts of reference works, but none of them can take the place of this book. It is as indispensable as a dictionary—and more useful. Fully indexed. Price $4.00. Modern Mechanix and Inventions, 529 S. Seventh St., Minneapolis, Minn. FORMULAS—all kinds. Guaranteed. Catalog free. “Кетісо”, B-16, Park- ridge, Ill. FORMULAS, business plans. Liter- ature free. D-Belfort, 4042 N. Keeler, Chicago. HELP WANTED STOP worrying about money! I'll start you with a regular weekly route supply- ing famous “Zanol” Products to steady customers, Routes pay $27.50 weekly up. Pay begins immediately. Write Albert Mills, Route Mgr., 3701 Mon- mouth, Cincinnati, Ohio. HELP WANTED—MALE INSTRUCTION DETECTIVES. Work home or travel. Experience unnecessary. Write, Ameri- can Detective System, 2640-T Broad. way, N. Y. INVENTIONS INVENTIONS commercialized, pat- ented, unpatented. Contact manufac- turers. Precilla Company, Call Build- ing, San Francisco, California. INVENTIONS Commercialized. Pat- Write Adam 582 Enright, St. ented or unpatented. Fisher Mfg. Co., Louis, Missouri. S o Jg [©] E: in m 5 e Li 3 4, о 3 £z. o 5 ua e. (o я э. О "Э e А, experimental work in all branches; lead work for chemical use. We manufac- ture to your order. Parts supplied for anything. Write us your needs. San- ford Exchange, P. О. Box 148, Flush- ing Sta., Flushing, N. Y. INVENTORS INFORMATION |INFORMATION any subject $1.00. New York mailing Address $2.50 monthly. Representation of any Busi- ness or Individual. American, Room 1400. 79 Madison Ave., New York. INSTRUCTION MUS Meo MONTH Start. Steady fen-women, 18-50. Hundreds future j Common education ton Bldg., St. Louis, Mo. MAGIC GOODS FOUR Big Magic Catalogs and Seven Mystifying Optical Delusions postpaid 25c. Gilmagico, Morgan Park, Chicago. MAGIC MAGIC Catalogue. Wonderful knock- out card trick. Dime, Singer, 444, Han- cock, Wisconsin. LEARN MAGIC. Large illustrated catalog of tricks you сап do, 25c. Holden, 237 W. 42nd St., N. Y MISCELLANEOUS EFFECTIVE sales letters $3,00; ads $1.00; 12, $10.00. "Superad" Service, Box 250, Ithaca, N. Y. MALE HELP WANTED WANTED—Names of men desiring steady outdoor jobs; $1700-$2400 year; patrol parks; protect game. rite, Del- mar Inst., B-32, Denver, Colo. FOREST JOBS easily available. $200 month. Cabin. Hunt, trap, patrol. Get details immediately. Rayson Service, K-32, Denver, Colorado. MOVIE CAMERAS FOR SALE 16 and 94mm MOVIES. New list, 100 bargains, standard projectors, cameras, equipment. Save up to 50%. 100' art $3. Free Library Membership, Mogull Bros., 1944-G Boston Road, N.Y.C. (Continued on page 28) Ty = •· 27

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CLASSIFIED ADS--(Continued from Page 27) MACHINERY AND TOOLS LATHE Bargains—Factory Rebuilt and Demonstrators. 9", 13", 16" swing screw cutting lathes. Also few used lathes in good condition, 90% new. Write South Bend Lathe Works, 263 Madison, South Bend, Ind. MODEL ENGINE “REAL” Motor, gasoline,- for model airplanes, boats, 34'"x34'", \% .р., weight 1 lb., 3200 r.p.m. Catalog “Real Boats," motors, fittings, 20c coin. P. Loutre!, 96 McDonough St., Brooklyn, New York. MODEL MAKING SHIP Model Making Books by Captain E. Armitage McCann. Vol. 1—How to Make Worth-while Models of a Pic- turesque Pirate Felucca and a Beauti- ful Spanish Galleon, 16th, 17th cen- tury. Both of these models, though decoratively treated, аге correct to period and scale. They are very colorful and beautiful for any home. The method of building these models has been so simplified that they can easily be made by any handy person. Price, $2.50. Vol. II—How to Make a Model of a Clipper Ship. This book describes how the novice or expert can make a scale model of Donald McKay's most beauti- ful ship, the famous "Sovereign of the Seas," 1852. The instructions for build- ing this ship are so clearly presented, from start to finish, that anyone can fol- low them and construct this stately ro- mantic vessel, either simplifed to the last degree, consistent with obtaining the correct effect, or with every detail the ship would have. No special tools or knowledge are required. Price, $2.50. Vol. ITI—How to Make a Model of the U. S. Frigate Constitution. Here are given complete instructions for making America's own “Old Yronsides"— 1797. The first part eliminates all unessential details, making the work easy and quick for the novice. The second part gives details of all the parts required for an exhaustively exact, scale model. Early and reconstruction government plans, documents, models and contemporary books and drawings have been consulted in order to make the book as correct and authoritative as ‘possible, so that it can be confidently recommended to the ama- teur or expert. Price, $2.50. Modern Mechanix and Inventions, 529 South Seventh Street, Minneapolis, Minn. MOTORCYCLES =e eS SEND 15c for illustrated used Motor- cycle catalog. Large stock. Bargains. Indian parts. Accessories. Indian Mo. torcycle Sales, Kansas City, Mo. MUSIC SONGWRITERS—music to poem, $3. Guaranteed. Orpha Phillips, Pine Bush, ew York. | MODELS INVENTORS: Send us sketch or crude model of your idea. Crescent craftsmen will develop it into a prac- tical working model. 30 years of suc- cessful 'experience and thousands of satisfied clients. Confidential service guaranteed. Bank references furnished. Free illustrated book: “Making Inven- tions Pay." Crescent Tool Co., Dept. T-2, Cincinnati, Ohio. | NUMISMATIC 5 DIFFERENT Coins, 15 Bills and catalog, 25c. Creamer's, 1112 Somerset, Baltimore, Maryland. Gi 28 OLD COINS, STAMPS WE BUY old coins, bills, stamps, jewel- ry, antiques, etc. Buyers waiting for anything you have to sell. Money mailed promptly. Goods returned if not satis- ed. Sanford Exchange, P. O. Box 148, Flushing Sta., Flushing, N. Y. PATENTS GET your own patents; legal blanks, complete instructions $1. Cudding Sons, Campbell, Calif. INVENTIONS Commercialized. Pat- ented or unpatented.. Write, Adam Fisher Mfg. Co., 582 Enright, St. Louis, Missouri. HONEST and reliable answers to all questions about your idea, about patents, patent law and procedure, inventions | and sales, foreign patents, protection of ideas, marketing plans; $1 per question —by Author, Lawyer, Patent Expert. Inventors Patent Service, 403 San Fer- nando Bldg. Los Angeles, Calif. PATENTS—Small Ideas may have large commercial possibilities. Write immediately for free book, “How to Obtain a Patent" and “Record of In- vention” form. Delays are dangerous in patent matters. Free information on how to proceed. Clarence A. O’Brien, 28-J, Adams Building, Washington, See page 12. PATENT ATTORNEYS INVENT something! New discoveries have cured previous depressions. paterited ideas can be sold. I tell you how and help you make the sale. particulars. Write W. T. Greene, 958 Barrister Building, Washington, D. C. PATENT Your invention now. Little ideas may have big commercial possi- bilities. Send for free book, "How to Obtain a Patent," and free “Record of Invention Blank." In business since 1898, specializing in patent matters, we have successfully served thousands of inventors. Delays are dangerous in patent matters—act at once and protect your idea. Reasonable fees. Deferred payments. Write us today. Victor J. Evans & Co., 647 BB Victor Bldg., Washington, D. C. PERSONAL g Valuable information free. Write today. Box 128-MM, Tiffin, Ohio. PLAYS—ENTERTAINMENTS MINSTREL Show—Complete for $1. Particulars free. Rialto Publishers, 1539 Broadway. New York. PHOTO FINISHING R221 Securities Bldg., Des Moines, Ia. POCKET RADIOS GUARANTEED “Pocket Radio,” $2.00. Catalogue, 10c. Neil Tasker, Shamokin, Pennsylvania. PROPELLERS PROPELLERS designed especially for boats, sleds, or planes. Be sure to state your particular need. The J. B. ropeller, Lititz, Pa. PRINTING OUTFITS and SUPPLIES PRINT your own cards, stationery, cir- culars, advertising, etc. Save money. Easy rules furnished. Print for others, big profits. Junior press, $5.90; job presses, $11; power, $149. Write for free catalog and full information. Kel- sey Co., S-57, Meriden, Conn. - Almanac.” PRINTING 1000 BUSINESS. Cards $1.50. Globe Printery, 1114 Ohio Ave., Columbus, O. RADIO SHORT wave construction kits, sets, supplies. Wholesale catalog 10c. Еей- eral Radio, 4222 Clifford Road, Cincin- nati, Ohio. _______ВАЮІ05 FOR SALE __ NEW 300-mile "Pocket" Radio, $3.85. Complete with special loud receiver. No tubes or batteries required. Order direct. Spencer Laboratories, Dept. 10, Akron, Ohio. ` ROOTS AND HERBS JUST OUT! World's greatest “Herb Beautifully illustrated in natural colors. Contains over 500 old- fashioned herb medicine recipes and In- dian secrets for home use. 10с (coin) postpaid. Worth dollars! Bontanics, 145 W. 112th St., Chicago. SALESMEN FINANCIAL independence and in- come for life through constant, ever increasing repeat commissions without callbacks. The business made rich by the depression. Business and profes. sional men buy on sight. 40076 initial rofit. Commonwealth Co., 508 S. Dear- orn, Chicago. SHORT STORIES SHORT Stories Revised. Typewritten, Marketed. Details Free. Hursh Service, Box K-1013, Harrisburg, Pa. STAMPS STAMPS! 100 diff. 2c; 500 diff. 356.; 1,000 dif. 90c, Tatham Stampco, D9, West Springfield, Massachusetts. 6 SCARCE triangles, Philatelic Maga- zine, 10c. Gardner, 5220-Cuthbert, Baltimore, Md. SONGWRITERS SONGWRITERS! Poems, melodies. Astounding proposition., Hibbeler, D195X, 2104 Keystone, Chicago. SONG writers wanted now. 50-50 plan. Indiana Song Bureau, Salem, Indiana. TELEVISION A B C of Television or Seeing by Radio contains 210 profusely illustrated pages. The first portion throws the soft light of understanding on the subject of the different television systems in use today. In so doing, it clearly, concisely and in the simplest of terms, outlines the real fundamentals of each system. The prob- lems of scanning, amplification of light modulated signals, photo-electric and selenium cells, neon lamps and syn- chronizing appurtenances are covered in detail. The book appeals to those who wish to build television receivers and transmitters either for entertainment or research purposes. 210 pages, price $3.00. Modern Mechanix and Inven- tions, 529 South Seventh Street, Min- neapolis, Minn. VENTRILOQUISTS LEARN Ventriloquism by mail; small cost, 3c stamp brings particulars. Geo. W. Smith, 125 North Jefferson, Room S-549, Peoria, Ill. WATCH MAKING WATCH and Clock Makers’ Manual, F. W. Britten, 340 pages, 136 illus- trations. Cloth, $3.00. Thoroughly prac- tical book dealing with various phases of watch and clock repair and adjustment. Contains very useful information deal- ing fully with the watchmaker's lathe and its operation. Modern Mechanix and Inventions, 529 South Seventh St., Minneapolis, Minn. Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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Railway Postal Clerks $158 Month First Year Raise to Maximum o£ $225 Month Many Other U. S. Government Jobs Open to Men and Boys 18 to 50 POST OFFICE CLERKS RURAL MAIL CARRIERS CITY MAIL CARRIERS IMMIGRANT INSPECTORS CUSTOMS INSPECTORS Hundreds of positions are accumulating to be filed as the depression lifts. ALLOWANCE FOR HOTEL EXPENSES Railway Postal] Clerks now get $1900 the first year regularly, being paid on the first and fifteenth of each month. $79.16 each pay day. In normal years their pay is increased $100 and $150 a year. The maximum is $2700 a year. $112.50 each pay day. They get extra allowance for hotel expenses when away from home, PAID VACATIONS Railway Postal Clerks, like all Government employees, in normal years are given a yearly vacation of 15 working days (about 18 days). When on runs they usually work 3 days and have 3 days off duty or in the same proportion. During this off duty and vacation, their pay continues just as though they were working. When they grow old, they are retired with a pension. As Railway Postal Clerks are continually traveling, they have an excellent chance to see the country. CITY MAIL CARRIERS—POST OFFICE CLERKS Clerks and Carriers get $1700 the first year regularly and in normal years automatically increase $100 a year to $2100 with кел воа ^ Lie eis Pd FRANKLIN at Wi ou Earn ears From Now Compare these conditions with your present « Шу а: or your prospective condition, perhaps chang- ept, E-314, ing positions frequently, kicking around s ROCHESTER, N. Y. from posttopillar, no chance in sight for В ө PERMANENT employment; fre- ^ Rush to me entirely free of quently out of a position and the 4 charge 32 page book with (1) year's average salary very low. Ў „а full description of the posi- 9 tion Checked below; (2) a list of DO YOU EARN $1900 EYERY «e i {гиге U. S. Government jobs; (3) К. Р] 5 ell m iti А Ўр Paral сш [атадан S FRO} —Railway Posta erk..... 00-52700 NOW YOU WILL y) — Post Office Clerk.......... cu OL 32000105 & —City Mail Саггјег........... ($1700-$2100) EVERY. d p —Rural Mail Carrier ........... (82100-33400) YEAR? m —-General Clerk and File Clerk. .... (81260-22500) # Inspector of Customs............ ($2100-$3300) ^4 Immigrant Inspector rrr ($2100-33000) ^H Stenographer: Typist ................. ($1440.$2500) Get FREE List of Positions d Fill out the coupon. Tear it off and mail it teday— 4 Маше ананавй "tá now, at once.DO IT NOW—This investment of three cents for a postage stamp with this coupon may 4 result in your getting a U. S. Government Job. Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 29

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DODE DRAFTING TRAINING | LEADS to 1 GOOD PAY JOD in TECHNICAL, BUILDING and MEC HANICAL FIELDS Send the coupon for my PAY RAISING PLAN—facts for every man who has to work for & living. Learn how you can quickly and easily prepare yourself at home for апу oi hundreds of GOOD PAY jobs through Drafting — the foundation of all progress and enter- rise. Learn how thousands of others ave done it. How you, too, can make your own better times—be more certain of employment — good wages — 2 bright and happy future—through preparation in Drafting. Train at Home for Good Pay and a Future For more than 30 years, in good times Learn from an Engineer As an engineer I know your needs, I train you on practical work, not schoolroom theorles. When your training is finished you are ready for a good Drafting job. PAYING POSITIONS as Chiefs, Super- intendents, Foremen, Engineers, ete., by starting them in Drafting. Drafting means good рау, and the open door to the BEST JOBS in Building, Engineering and Factory Production. The progress of the world depends on the Draftsman. That's the kind of OPPORTUNITY I offer you. If you have difficulties—if you are troubled because of small pay, or no job at all—if your future looks bad— INVESTIG ATE! Tind out what your chances are as a TRAINED and as an untrained man. Mail the coupon. I will send you two VITAL MESSAGES at.once, and show you what you can do “in Drafting. Act Now! It Costs Noth- ing to Get the Facts Malling the coupon will not obligate you in any way, yet it may be the turning | olnt in уо, our life. Send it at once for A THE "A C'TS, including my offer of a professional Draftsman's outfit, Sent when you start, "earn while you learn" instruction, and con- tinuous help until you are all set on a PAY- ING JOB, No salesman will call on you to A valuable message, for these tImes.' Should be read by every швп who is wondering what tbe next few years will bring hin. FREE. urge you in any way. Just send your name апа address апа de- cide for yourself, But DO IT NOW! This is the book that has helped so many inen into good jobs and good futures. Sent FREE. саир ыр с ЖЫТ ЖЕ ШЕР ЖЕЎ у GERD SENS COND GRE ENGINEER DOBE, Dept. 22, 1951 Lawrence Avenue, Chicago. Send me particulars of your home training and the op ortunitles to which Draftlng leads, including the two messages of Vital Facts. and bad, I have helped men into GOOD ` | ANDY’S SHOP MAIL BOX (Continued from page 20) Jack McMath, of Cape Charles, Va., bujlt this wind wagon out of an old Chev. She wheels free! power per pound of weight than the gasoline engine, thereby removing the bogey of weight and adding efficient power development to the other qualifications of the Diesel, economy in fuel, safety from fire, elimination of radio in- terference and reliability. Mr. Cudd’s experimental engine, built from materials about the shop, has no provision for air intake at the head of the cylinder. For the experiments Mr. Cudd has attached a com- pressed air hose to one of the ports at the base of the cylinder and has used that in place of the regular intake. This does not give him the complete clearance of the cylinder that is to be expected of the original idea of the intake at the head of the cylinder and the two exhaust ports at the base. See pix on opening page. a * * This tireless, energetic man out on the west coast, Alvia Peters, sends us a running fire of what his strong association is doing. А fine stand on a pertinent subject, and all NABA members are to be congratulated on their work and their leader, who has convinced us of his sincerity. Get this: Oakland, Calif. Hello Fellers: I guess it's about time I get in and let you hear from this old outfit as it tnay be of in- terest to some of you to know how we are getting along. First of most importance is that we are In- corporated. Next it is a closed corp. no stock being for sale, next comes the fact that the owners of the stock are those of the gang that joined when we organized and stayed with us so this is one Corporation that consists of just common plugs that are trying to do what all the gang wants to see done. That is to get a GOOD plane approved that the gang of com- mon people can build at home and get that (NC) license on it. Are we doing it? You bet we are and by the first of the year Our Naba will be approved and flying then it will be possible for anyone that has mechanical ability, to build one from approved blueprints and if they build accord- ing to those blueprints and be sure and put in good careful workmanship there will be no ( Continued on page 32) e CI] MM MÀ шш „ш M — шыш ш a À—À e 30 Thank You for Mentioning Modern Mechanix and Inventions jor February When Writing to Advertisers

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МА at these pictures! The greatest all-around muscle-building combination you ever saw—all in one great 12-in-1 Outfit. Mere's everything you need to develop EVERY muscle in your body. Just spend a few minutes a day with that snappy Wall Exerciser, the big Chest Expander, the zippy Rowing Machine and the other muscle build- ers shown here—and WATCH THOSE MUSCLES GROW! Read list below. The whole works for less than a five-dollar bill— with Complete Course, two great Books and private Sex Lesson thrown in for good measure. GUARANTEE You don’t risk a cent. Examine this wonder- ful 12-1n-1 Outfit for yourself. YOUR MONEY RIGHT BACK if you want it. Here’s What You Get 6—Professlonal Skip Rope, develops speed, wind and agility. 7—Complete Rawing Machine Attach- ments. 8—Foot Stirrup, patented, non-slip; for legs, Rush Coupon ‘nc Just write name and address fem a аш шш иш wm m» in coupon AT ONCE. Pay4 gie узо Postman only $4.98, plus ас- 55 East 114 Street, tual postage on delivery. (Or, New York City. Dear Mike: Shoot me the send $4.98 and I pay post-# works c. 0. D. I'll pay $4.98, I—Complete set of Wall Exerclser Attachments. 2—-Adjustable Head Gear thiphs, stomach. i us actual postage. My money develops powerful neck 9—Twelve Weeks’ sclentific age.) Simply return outfit J plus i I Pa ot satished and muscles, and— Muscle-Bullding course, | immediately if not pleased, Ф retorn outfit Immediately. 3—Adlustable Foot Gear a complete system that Don't miss this wonderful bar for building ‘muscular glves powerful, symmet- Ва lens and thighs. rical body, gain. Send TODAY. First ох... 4—Two High-Tension 10—-Епсуеіорәйа of Health | come, first served. Grips, bud, strong ii and Strength. + l wrisi an arearms. —Book on Jiu su. 4 Address ee ноне ee eere 5—Ten- Cable Progressive (2—Speclal Confidential Sex Michael McFadden l Chest Expander (300 Lesson of startling Dept. W-2 16. resistance). FACTS. 55 East 11th St. bo ——— State.... New York, N. Y. Outside U. S. send cash with order. Д Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 31

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AUTO [ЕСНАМ1С$ А NY MAN from 16 to 60 can become an expert in Auto and Aviation Mechanics in 8 weeks. The Automotive business is our largest industry. It holds big pay jobs for TRAINED MEN. It offers unlimited opportunities for a business of your own. In this day, the untrained man hasn't a chance. The man who KNOWS is the man who GOES. EIGHT WEEKS OF ACTUAL SHOP TRAINING Come to my school in Cleveland. Here, expert instructors teach you to work with real tools on real automotive equip- ment. No books or lessons! Not a correspondence course. In eight short weeks, you are trained to hold down a job that pays from $35 to $70 a week or start your own repair shop. You learn by DOING everything from a simple tire repair job to the most complicated motor assembly. . AVIATION MECHANICS PART OF YOUR TRAINING Aviation is the new field that is rapidly approaching the auto- motive in Big Pay Jobs for TRAINED MEN. The McSweeny Shop-Plan Method gives you thorough training in Aviation Mechanics. You learn under the practical guidance of expe- rienced instructors. The complete Auto and Aviation Me- chanics Course is described in the Big FREE Auto Book. MAIL THE COUPON TODAY. SATISFACTION GUARANTEED In 8 weeks of intensive training: actual shop work with real tools on real machines and equipment, you will be qualified to do as over 50,000 McSweeny trained men have done...accept a big pay job asan expert on Auto and Aviation Mechanics. If, upon graduation, you are not satisfied, your tuition will be refunded. Read what two out of 50,000 McSweeny graduates are doing. Dear Мас: Please forward me your catalog. I want it to add to my traveling souvenirs. I am working in a modern garage although I have been out of school only four weeks, thanks to McSweeny Train- ing. My best regards to all.— M. Klushauk. Dear Mae: Just a few lines which might interest you. I left your school twa years ago last May. Since Y left I have not seen a day I could call thard times’’. I have been working ever since I left and have averaged in my earnings $173.00 a month, Іп spite of the hard times. Many thanks. Thos. J. Sharp. FREE! 59 Mestretes Write today for my Big Book on AUTOS. Get the facts about jobs; about New LOW Tuition Offers. Mailing the coupon does NOT obligate you. Ir obligates ME to tell YOU how you can become an expert in Auto and Aviation Mechanics in 8 weeks. MeSweeny Schools Auto, Tractor and Aviation Dept. A-11-2 CLEVELAND, OHIO MAIL COUPON FOR FREE BOOK ше ша шы жы шы ип шш ын эш па киш иш ER эы аш кию шр McSweeny Auto, Tractor and Aviation School a M Dept. A-1122, Cleveland, Ohio. i Without cost or obligation, send me your Big, FREE Book L| on AUTOS; also full informatlon about your new, low Tuition I a offer, and Employment Service. ANDY’S SHOP MAIL BOX (Continued from page 30) argument about getting the ship licensed. And let me say right here that a man does not havc to be a (LICENSED) mechanic either to build his own plane because the writer is not and has built more than one plane and got them licensed. Speaking of real blueprints that are simple to read and are detailed to the last nut, bolt and screw. Well, this set is the most complete ever offered the public and there is 150 square feet of them or enough to cover a wall 10. ft. high and 15 ft. long divided into about 60 different drawings so it's very plain to see there must be something detailed about them. They will sell for about $20.00 per set and what a plane they represent. Some of the gang saw а, picture іп a March issue of М.М. of the experimental Naba. Well, it was a pretty snappy old rig and flew all over the coast states, but the new Naba is so much better and more beautiful and refined that the old one is out of the picture. That three wheel landing gear has been per- - fected so much that a girl and two men soloed the plane in two hours, average. These people never had the controls of a plane in their hands before. Here are some of the features of Naba. Three wheel landing gear with brakes. Dual WHEEL control. Cross Country Twin Motor. Shoulder high cockpit. It will not ground loop. It cannot nose over. Will taxi tail wind or side wind. Can be moved on ground by a child. No need to lift the tail or use a dolley. The largest plane in the light plane field. Now listen, gang, we are not ready to release all the blueprints yet, but if you want to start the ribs, etc., drop a line and you will get the dope, BUT inclose a stamp or we will not an- swer, as we have plenty expense as it is and just because we are incorporlated is no sign we can spend money yet because remember, we are just one of the GANG. We will have our first advertising in the January or February magazines. National Aircraft Builders Assn., Inc. By Alvia Peters, President. + » з : А breezy letter accompanied by some doubtful pix next comes off the spindle: Columbiana, Ohio. To Andy the Grease Monk: (Or is it greasy monk; or mug?) Dear ?? Andy: : I am peeved and I don't mean maybe. I have written a letter to you once before and also one to Douglas Rolfe and have not even received an answer to my questions, so Pm peeved. However, I will try this once more because I think some of the gang might be interested in the snaps I am enclosing in this letter. If you think the gang would get any good out of them why publish them but send the snaps back in the stamped envelope I am enclosing. The pix are of a Model T conversion I built out of scrap pieces at a cost liberally estimated at some less than twenty-five simoleons. I think ( Continued on page 34) I ——————————————————————————————mÓ 32 Thank: You for Mentioning Modern Mechanix and Inventions Jor February When Writing to Advertisers

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THE 1933 FLYING MANUAL is now ready for you! Crammed with plans for light monoplanes, seaplanes, aviation motors, and countless other items of vital interest to the light air- plane enthusiast. Here's a sample of some of the high spots in the Edition: PIETENPOL SKY SCOUT —Plans for this one-place monoplane powered by Model T Ford motor. CORBEN CABIN MONOPLANE—Also shown as open cockpit job. Cabin plane costs only $220 for materials, less motor! HICKMAN BABY SEAPLANE—A one- place twin-pontoon biplane seaplane. GERE BIPLANE—Neat ship for Ford or Chevrolet power plant, resembling ап army pursuit job — and many others. PRICE 50 CENTS If your news dealer cannot supply you, send 50 cents to Fawcett Publications, Inc., 529 S. Seventh St., Minneapolis, Minn., and a copy of the 1933 Flying Manual will be mailed to you at once. Big Stuff for Real Meechanies ? Back issues of the Mechanical Package Maga- zine, the famous publication for real mechan- ics interested in building boats, engines, light airplanes and countless other items, are still available from the publishers. Contents of these issues are listed below: NO. 1 Contains construction kit for building an electric motor—Self-launching trailer for boats— Plans for 60 m.p.h. aero ісе sled—Electric model boat—Model 1⁄4 h.p. gasoline engine “Mighty Atom"—Speed boat plans. NO. 2 Contains construction kit for making tele- graph key and sounder—Miniature steam hydro- planes—A 40 h.p. airplane engine; how to build it —Plans for 19 ft. cabin cruiser—Dynamos, kites, models. NO. 3 Contains complete kit of parts for building a steam engine that really runs—Packmag midget man-carrying seaplane—Model man-carrying tug— Steam engine construction—Baby race car plans— "Buddy" cruiser by Rabl—Storage battery building. NO. 4 Contains complete race car blueprints in large size (18" x 24") — Моде! locomotive build- ing dope—Plans for model steam boat—Doane 15% ft, 40 m.p.h. hydrobout runabout—Short wave converter—Photo electric stuff—Gas engine plans—Model steam engine dope. BY MAIL 35 CENTS Mechanical Package Magazine 529 S. Seventh St. Ке Minneapolis, Minn. Henry Morse made $1,520 in 5 months. E. J. Hudson made $52.50 more than the cost of his equipment in his first three weeks in business. C. Wanderschied made $300 in 3 months, just in spare time. Many men'have made а big success in this busi- ness. i i GET INTO BUSINESS | FOR YOURSELF | | } be independent! Here's a business that’s all cash . no credit risks, no money tied up in stock, no high overhead expense, no canvassing necessary, very small invest- ment in equipment, no experience or train- ing required. Our Free Plan starts you right! The Foley Electrakeen Lawn Mower Sharpener is a remarkable machine that sharpens all kinds and sizes of lawn mowers by the same method used by all lawn mower manufacturers, Does a perfect job in from 15 to 20 minutes, sharpening all blades and the cutter bar at the same time. You get $1.00 to $1.50 a job—$3 to $5 an hour. 99c is profit out of every dollar you take in. New attachment also grinds axes, hatchets, knives and all ordinary sharp-edged tools. Sold on easy payments, it quickly pays for itself. | Here’s Your Chance! The busy season for this business is just ahead. Investigate the money-making possibilities in this business NOW, and be all ready for an early start this spring. Send the coupon or a postcard for com- plete information and free plan. Мо salesman will call. [ue c Uc UT FOLEY MANUFACTURING CO. | 206-3 Foley Bldg. , 11 Main St. N. E. , Mianeapells, Mion. і Please send me FREE PLAN and tell me how I I | can make BIG MONEY with the Foley Electrakeen Lawn Mower Sharpener. 2 mp 3 ч Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 33

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$499 and coupon below WOULD HAVE SAVED THEM FROM POVERTY A tiny sum invested today—and those precious lives that are in your keeping are made safe by old line, legal reserve life insurance. There is nothing complicated, nothing difficult. The Postal Life Insurance Company which has paid more than $40,000,000 to policy holders and has been known all over the world for 27 years, is now making a timely special offer which no one can afford to miss. Just think of it. For a premium of only $1.00 per month you may have the protection of sound legal reserve life insurance backed by more than $21,000,000 in assets. Same premium for all ages—15 to 50 both men and women. The policy is writ- ten in exact conformity to the strin- $1.00 a month 1 purchases gent insurance laws of New York, Insur- Ineur. carries full cash and loan values and Age ance 2 extended insurance privileges. Гог this special offer it is modified to re- duce the premiums to one-half of the premiums payable after five years. Consult the table right in this ad- vertisement and see how much in- surance $1.00 per month will buy at your age. $2.00 wil buy twice as much, etc. Then send the coupon below with the amount to cover your first month's premium. No agent will call upon you. Postal sells only through the mail You risk nothing. Your money will be refunded instant- ly if your application is not accepted. Do not delay another hour. Send the toupon below. m e e шии UEM эрк CUM VN imr кш» m HUNE POSTAL LIFE INSURANCE CO. -—Arthur Jordan, Pres. Dept. V2, 511 АНҺ Avenue, NEW YORK, N.Y. Аке ance 33 $935 Other policles for other ages SEND {оо WITH THIS — . COUPON - ANDY’S SHOP MAIL BOX (Continued from page 32) a great many of the gang are situated like I am; I would like to build an airplane but I have neither the money nor the equipment. I would also like to build a sport roadster like the one in one of the late M.M.’s but even that is out of my reach; so I decided that the cheapest and most practical job would be a Model T. The frame is lowered seven and one half inches; the front is swung on an angle iron in the manner described by one of the gang about a year ago, as you can see by the snapshot. The reat end is a pair of brackets of my own design, as I did not like the ideas submitted by the mech. who furnished the idea for the front bracket. | The drive shaft is shortened 21" but that was only an experiment on my part and I don't. believe it is worth what it costs. That is one’ thing that can be cut from the cost of the job. The body is not as nice as I had planned, but it was my first try and when I made а mise take I could not afford to correct it so it went. into the job. I found there were a lot of places I had not planned any course of-action on and now that I have it done my blunders. show up. very well indeed. The tail is too stubby and I did not shape my dash to allow for the slant. of the cowl; also around the front of the cock- pit I should have rolled a small rod into the edge of the sheet metal because when you get into the seat you put your weight on the cowl edge and it puts kinks in the edge. However, it has its good points; it carries two average sized people and the back of the seat is hinged to permit access to the tool box and gas tank. She holds the road good and the only thing I know about the speed is, I caught and passed a Model А Ford 729 coach after he bad a start of the time it took me to turn around in the road. I passed him in less than a half a mile and my car has no speed parts of any kind; just a standard ring gear and pinion and the motor has new rings. This chassis is a very satisfactory outfit and the underslinging is lower than boughten parts give and the cost won't scare any one. I have been out of work for two years and I ran out of money or I would have had a top and wind- shield on my buggy. The shield folds down and the top can be put away in the tool box accord- ing to my plans. So if any of the gang wants to profit by my mistakes, they can ask me. Sherril M. Burt. TRICKS WITH ELECTRICITY I] am enclosing $........... eese which will purchase Make things spin, jump, kick, shoot, shock, flash, buzz, fo exit d Vue Ac Ens worth of insurance. mystify—all by electricity. Make lights obey voice, window novelties, trick lights, floating d Exact date of birth........ Puis DEEST NECS EDS S rings, spirit rapping—all kinds amusing, practical devices. Book tells how to do Name эз. кажа жаа а кара КЫ ЕЕ ЫЕ В жага жө ideis 200 stunts with 110 volts A. C. Postpaid $1. Catalog free. Btreet tos si ees GET YOUR OWN PATENTS E dcc CIS Kl Rr eae Opt M ИРА Pay only government fees. Legal blanks and hoor of instructions, $1. Inventor’s and exper ШШ s catalog free. ERI redes eese osaka serra nh RT Ббаѓе............. CUTTING & SONS 23 D St. MPBELL, CALIF. mc 34 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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YOUR JOB INSURANCE for only $765 in easy pay- ments In Any Mechanical or Technical Work, MATHEMATICS Is Essential to Success Untrained Men Must Go. There Are Jobs and Contracts Today Only For Trained Men—Men Whose Work Is Solidly Based on Knowledge of Mathematics Employers today can afford to hire and keep only thoroughly qualified men. They are selecting the key men to carry on now and to advance to more important posi- tions when their organizations are again expanded. The most effective way to protect your present job and insure your future advance- ment is to learn the most necessary of all practical subjects—mathematics. In every line of business or mechanical, scientific, or technical work, mathematics training is the essential foundation without which you haven't got a chance. It is the language and the principal tool of all science and of all business or industry based on science. You need mathematics to solve every technical problem; to be able to assume executive responsibility ; to improve, speed up, and cheek on your work and the work of others. Such basic training is quickly recognized and gladly paid for. You are automatically singled out from the crowd and given preference whether it is a matter of a job, a promotion, or a contract for work. Now--Mathematics Self-Taught--Easily, Quickly, Inexpensively Now you can take advantage of this easy method which has been worked out by an expert for those who do not wish to give the time апа money required by other methods of mathematical study. A very simple and extremely interesting group of books has been prepared for you by а man who has devoted his life to teaching practical men the fundamentals of this important subject. MATHEMATICS for Self Study By J. E. Thompson, B.S. in E.E., A.M., Dept. of Mathematics, Pratt Institute, Brooklyn. These books start right from the beginning with a review of arithmetic that gives you many short-cuts and “trick” methods of calculation that clip hours from your working time. Then they go right into higher mathematics, and you are surprised to see how clear it is when an expert explains it for you. As you go along, you see more and more how you can apply mathematics to your own work—how you can easily solve problems that you once had to let someone higher up do for you. In a short time you will be tackling with confidence even the most difficult problems. And then you will realize how much your knowledge of mathematics has accom- plished for you. A Complete Course and Reference Work on Mathematics in These Four Inexpensive Books Starting from the first simple principles, these interesting books take you, by easy stages, into the detailed applications of higher mathematics. Each step is clearly explained and is followed directly by sample problems. Arithmetic for the Practical Man — Algebra for the Practical Man Trigonometry for the Practical Man — Calculus for the Practical Man 4 Volumes—1240 Pages—Illustrated Send No Money Examine These Books for 10 Days Free Án The coupon below brings you the four books for 10 days’ free trial. Expert After 10 days, return the books to us without obligation or send Gi us the small down payment of $1.65—balance in three monthly ives payments of $2.00 each (5% discount for cash). You These MAIL THIS COUPON D. Van Nostrand Co., Inc., fied 250 Fourth Ave., New York Methods Send me MATHEMATICS FOR SELF STUDY in 4 volumes. Within 10 days | will either return the books or send you $1.65 as first payment and $2.00 per month for 3 months—total $7.65. (5% discount for cash.) (Mod. Mech. 2-33) Mr. Thompson, the author of these books, has had many years experience in giving students the kind of mathematical train- ing they need in practical work. He presents each practical method and problem in the clearest and simplest way. Look up any mathematical prob- lem that puzzles you and see how qulckly you get ihe solution in these books, City and абе... sinisa rayman n T | Every Minute you Spend with these Books Will pay you Big Dividends Business Connection .............. РЕ ОИЕ | Reference .................›.›..»5з55 95 ТОРЕНТ m | Impe Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 35 фи

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Amazing Secret TRAFFIC in | Shot to Death Ni ear Hc ome Бу | | | B- | q Here are two Chicago detectives examining arsenal of gangster’s lair. The army type machine gun in the fore- ground was the principal weapon in the assassination of a couple of rival gangsters who were put “оп the spot." Pump gun also makes effective artillery for close-up firing. 36 Headlines appearing with startling frequency in the daily papers attest to the efficacy of the submachine gun in gang battles. Photo shows how the Thompson sub-machine gun is held for firing from shoulder. If you are an honest, law-abiding citizen, you can’t buy a sub-machine gun—but if you’re a gangster you'll have no trouble. The author tells here how the un- derworld carries on an amazing secret traffic in machine guns and other deadly weapons. by STERLING GLEASON poss men walked down a busy city Street. Except that their right arms hung rather stiffly at their sides, their ap- pearance would have attracted no atten- tion anywhere. Yet each man was literally a walking arsenal. Under each well-tailored coat, a Thompson sub-machine gun nestled snug- ly against the bearer's armpit. The muzzle, only slightly protruding beneath his coat, was concealed in the palm of his hand. Close behind them walked two others— musicians, apparently. But the innocent- looking violin cases they carried held more machine guns. Each carried a round black drum loaded with 100 45-calibre bul- lets. In an instant these six men could have transformed themselves into a for- midable machine gun squad of terrible power. Modern Mechanix and

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Gang “DEATH е7САСНІМЕЅ Above—aAll policemen of New York are put through a course of instruc- tion on the handling of the sub- machine gun. Instructor at left is demonstrating the swordcane, a weapon used in France about a hun- dred years ago. Insert at right shows the hundred-round drum which feeds bullets to submachine gun at the rate of 400 to 800 a minute. Drums may be quickly slipped into position for gang assassination. Such a miniature army might today en- ter your own town and open a reign of terror. An amazing secret traffic in ma- chine guns has armed organized crime in military fashion. With revolvers and pistols for light arms, machine guns for artillery, armored automobiles for tanks, and tear gas for poison barrage, criminal mobs become more formidable than an army. All this is made possible by underworld channels which distribute the weapons for the sake of an cnormous profit. How do gangsters obtain these terrific instruments of death? Where are they manufactured? How are they distributed and sold? Recently the writer undertook to learn these facts. He found the amaz- ing truth to be that machine guns can be bought like so many sacks of potatoes— if you are known in criminal circles and have the money. Ап honest citizen might find it difficult to get one— but not a known gangster! Here is an example of how the system works. A number of sub-machine guns, or- dered in the name of the police depart- ment of a large citv, were diverted by an Inventions for February At right is seen foot strap which holds barrel steady in short bursts of firing. Careful aiming is unnecessary with the submachine gun. Spitting 100 rounds in 15 seconds, the gun needs only to be pointed in the general direction of the victim. The recoil causes the bullets to cut a pattern of holes curving upward. 37

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Pull on Trigger of Submachine Gun Sprays 100 Bullets in Fifteen Seconds FORE SIGHT P COOLING Crudely made but deadly, this ' DECREASED PRESSURE DRIVES BOLT BACKWARD, IE EJECTING CARTRIDGE gas pipe bomb” was intended for home of a Chicago gangster who was muscling in on a rival's territory. Police officer is explaining its construction. "HIGH PRE: AT FIRING: LOCK, FAR: ES FITTED WITH 100 CARTRIDGE DRUM unscrupulous official to a firearms com- pany in which he had a financial interest. When detectives checked up, the dealer said that all records had been lost, and that he could tell them nothing. Police did not doubt that the guns had passed into the hands of criminals, but lack of legal proof tied their hands. This episode was followed by a series of robberies in which machine guns were used. Soon afterwards, a carload of rack- eteers overtook an armored truck, opened a withering stream of machine gun bul- lets on the wheels, cut them out, and over- turned the truck. When the crew foolish- ly came out to give battle, they were shot down and a large payroll stolen. Modern machine guns are of two types —the machine gun, and the sub-machine gun. The machine gun, proper, is a large weapon, weighing, complete, several hun- dred pounds and requiring a tripod mounting. Its ammunition is generally of 38 FIRING PIN —~— = == | One of the chief advanta that it can be concealed b. shows the construction o shots, the gun literally зргауз a victim with bullets coming out almost end to end. Cartridges of .45 caliber, almost a half inch in diameter, kill instantly. RSs ges to gangsters of the Thompson submachine gun is eneath the coat, as illustrated at the left. Drawing above £ the deadly submachine gun. Operated by recoil of the .30 calibre, although .45 and .50-calibre guns are in use by the Army. The bullets are fired from belts or drums. The sub-machine gun is smaller, lighter, and requires no mounting. It is the prin- cipal weapon of the racketeer. Rapid-fire guns today are operated by the recoil of the barrel or the back-pres- sure of the powder gas. The Vickers, Browning, Maxim, and the Thompson sub- machine gun, are recoil-operated; the Browning auto-rifle, Hotchkiss, and Lewis machine guns are Operated by gas pres- sure. Because of its large size and weight, the ordinary machine gun is used almost exclusively by military authorities. Gang- sters prefer the Thompson sub-machine gun. If you study this weapon, you will realize what a terrifying thing it is, and understand its power. Short, stocky, light enough for one man to carry and use, it is in reality an automatic rifle which will pour out bullets at the terrific rate of 400 Modern Mechanix- -and

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Drucci, Chicago Gang Killer, Used Submachine Gun, Sawed Off Shotgun to 800 per minute—spitting them forth so fast that they are almost end to end. The ammunition is .45-calibre—giving the gun greater "stopping power" than any other ordinary machine gun or rifle. The impact of these heavy slugs will in- flict a terrible shock that stops the strong- est man immediately. Traveling at from 850 to 900 feet per second, the .45 bullet carries a muzzle- energy of 430 foot-pounds. At 300-foot range, it will penetrate white pine to a depth of 5% inches. Not only the force its bullets deliver upon impact, but its rapidity of fire, makes the gun so deadly. A 100-round drum may be fired in less than fifteen seconds. Pump 100 luss of lead, weighing more than three pounds all together, into the delicate parts of the human body, and you will put any man out of commission. . Accuracy of aim is not a strong point of the sub-machine gun. “It doesn't need to be accurate," one detective told me. “This gun puts out the bullets so fast they almost run over one another. You don’t put the gun to your shoulder and aim it, like a rifle. You just hold it at your side, point it in a general direction, and spray the mark with bullets. It's just like using a garden hose. The recoil lifts the muzzle and kicks it to the left, so that the gun cuts a pattern of bullet holes that curves diag- onally upward. Nothing could live in that line of fire." Although a tremendous power in the hands of the gangster, the machine gun is useful to police chiefly as a threat. Ruth- less gangsters have no objection to turn- ing a machine gun loose on the street, shooting down women and children with- out compunction. Such an occurrence has taken place in New York City three times within the past six months. Policemen, however, will not fire into a crowd. Tear-gas is more effective and does not permanently injure. Only when a des- perate criminal is barricaded in a house, for example, can the machine gun be used freely by police. “I have frequently used the sub-machine gun for personal protection," said one de- tective lieutenant whose work brings him into constant contact with gangsters. “For this purpose, a Thompson gun, plus a tear- gas 'fountain pen,' is ideal. *Recently I had to bring in a big beer baron who had just come to town and was wanted by police. A known killer, he was always accompanied by a heavily-armed bodyguard. *When I called at his hotel room, I car- ried the ‘typewriter’ in my hands. Aiming it straight ahead of me, I kicked the door open. When the beer baron and his body- guards saw the ugly muzzle of the ‘chop- per,’ they raised their hands skyward in a hurry. No man cares to argue with one . of these babies.” Police instructors are here seen showing policemen how a gunman conceals his weapons and how to perform the frisking act. This dummy is wear- ing a bullet proof vest. Right—Some of the weapons found in the arsenal of Schemer Drucci, Chicago gangster, famous for his ability as an execu- tioner. The submachine gun and the sawed-off shotgun were his favorite weapons. Left—The .30 and .45 caliber bullets. Inventions for February 39

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Robot Introduces Banquet Speakers and Makes it Snappy Prof. Beard with the robot which does duty as a speaker at boresome banquets. The robot, speaking from a self- starting phonograph, rattles off the customary introduction. Know Anybody Acting Like This? JEES and fairy stories as clues to what goes on in the brains of people suffering from the kind of insanity called dementia praecox were described recently by a Lon- ‚доп mental specialist. One familiar char- : acteristic of dreams is to shift rapidly from one idea or environment to another. The theory propounded is that dreams and fairy stories probably pass continually through the disordered minds of victims of demen- tia praecox. Anindividual who went around acting out such fairy stories obviously would be mad, which may be about what happens to the victims of dementia praecox. Stilt Walker Comes Down to Earth HEN Donald Pletsch, a vet- eran stilt-walker, grew tired of be- ing a mere long- legged pedestrian he decidedtocome down closer to earth, so he built himself a pair of one-wheeled skates from the re- mains of a coaster wagon. Walking on them appears to be a simple feat, but try it yourself Something new in skates. These and you'll find out are made from coaster wheels. differently. 40 ECOMMENDED for speakers tired of the general run of chairmen is a new robot speaker created by Prof. William Beard of the California Institute of Technology, at Pasadena. Prof. Beard takes the robot with him to lectures, sets it beside him, and the phono- graph within the robot speaks: “Friends and fellow robots, if any. Now I have got to be a chairman and introduce this distin- guished gentleman on the right who has a message of importance to give you. Unlike most chairmen, I am not going to talk you to death, but will cut it short. Okay, profes- sor, shoot.” Prof. Beard’s robot is made from sheet iron, a coffee pot, toothbrushes for eye- brows, electric lights for eyes, and a self- starting phonograph for a voice. Camera Records Auto Accidents ONFLICTING reports of traffic accidents need no longer baffle judges and juries, if an ingenious new camera recently intro- duced functions the way it is expected to. The purpose of the “evidence camera,” as it is called, is to photograph a diarama of the accident. While the details of the acci- dent are still fresh in the minds of the wit- nesses a miniature of the scene is recon- structed and photographed with the “evi- dence camera.” Then when the case is brought before the court in a lawsuit, the photograph is intro- duced to give a clear picture to the jury of the way the accident happened. At top is seen the evidence camera photographing scene of an accident in miniature. Below, photo shown to jury. Modern Mechanix and

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cA RAILWAY that GALLS “Down Hill “WAITING PLATFORM ds WE А | GRAVITY DROP ACCELERATE s E "m. TRAN CARRIES IT TO. POWER PLANT б MEXT STATION ENDLESS CHAIN DRIVE ENGAGES: BOTTOM OF CARS AND PULLS THEM UP. ERMAN engineers have recently proposed the building of novel “roller coaster" railways for use on short runs between cities and suburbs. The ingenious yet simple construction of this railway, which literally gets its power from fall- ing down hill, is well shown in the accompanying drawing. Each waiting station is elevated forty or more feet in the air, and passengers are lifted to the platform in an elevator. The train, consisting of two or three cars, awaits them on a level stretch of track beside the station. An endless chain drive, traveling underneath the track, engages the bot- tom of the leading car and pulls it past the station far enough to start rolling down the incline under its own momentum, exactly like the cars in a roller coaster. Sufficient speed will be generated to carry the train to the next station, where the chain drive lifts it to the top ready to repeat the performance. The main advantage of the system is that no locomotive or power car is re- quired in the train, eliminating the need for much heavy equipment. Operating details of the roller-coaster railway proposed by German engineers. A train gathers speed by plunging down the incline from the station, carrying it to the next station where it is hauled to the top by a chain drive. Inventions for February | 41

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Golf Club With Perforated Head Permits Longer Drives Lessening resistance of downward swing, perforated head of club permits harder swat, lengthening drive 15-25 per cent. Rubber Streets to Save Buildings А WAY to save many historic buildings in European cities, such as Westminster Abbey in London, from destruction by street vibration was proposed by Sir Stan- ley. Bois of London. It is to pave all streets in the neighborhood of such buildings with thick rubber blocks, so that the millions of daily shocks now imparted to roadways by trucks, busses and other heavy vehicles will be absorbed by the rubber before reaching the foundations of the buildings. Non-skid Tire Has Rubber Studs NEW anti-skid auto tire re- cently demonstrat- ed on the ice rink of the Palais des Sports in Paris promises to revo- lutionize the auto tire industry. The tire, seen in the photo at the left, consists of two outer rowsof studs on the tire com- posed of ordinary rubber and a cen- ter row made of soft rubber. The demonstration proved a complete Success and may be adapted on rac- ing autos. "Three rows of rubber studs grip the ice to prevent skidding. 42 А 15 TO 25 per cent increase in distance on drives is promised for the user of a new performance golf club that has re- cently been introduced. What gives the increased efficiency is the lessened air resistance of the head, which is hollow and perforated with eighth inch holes on the : striking.side. Dr. E. M. Thomas, of Inde- pendence, Mo., the inventor, is seen holding his creation in the photo at the left. Grind Organ Shoots Mechanic HE most unusual accident reported in: years, in which a young mechanic was shot through the heart by an ordinary grind organ, was uncovered recently in Vienna. The young man had obtained an old and dilapidated organ which he proceeded to repair. The spring, which was wound up tightly and stuck, came loose and unwound violently. Immediately the young mechanic ber hee to the floor and was found to be ead. A police officer ordered a complete X-ray examination of the body. Then the secret was disclosed. By the rapid unwinding of the spring a tiny projectile from the spring was shot through the young mechanic’s clothing and directly into his heart, the shock being responsible for his death. Huge Blowers Fight Orchard Frost Ford motor driving propeller directs blast of air from rotating “gun” to reduce frost peril to California orchards. RCHARDISTS all over the country are watching with keen interest the progress made by the giant wind machines that have been installed in Southern California. The wind machines are essentially huge blowers spouting a stream of air over the trees to combat the winter frost evils. The blower is mounted on a steel tower and is so constructed that it revolves in a complete circle to cover every section of the orchard. The power plant consists of a Model T Ford engine turning a prop which directs a stream of air out the spout. The deflector directs the air downward. Modern Mechanix and

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Oddities of § CIENCE > «хе = > EIN 12000 Years JANUARY WILLBE MID-SUMMER AND JULY MIDWINTER. Cone M Ў i polesof the Reay- А k f | à G We WATER DIDNT CARRY А- lens completely | b j [МЕ OZ. POTASSIUM IODIDE around т | „ ^ T 10Z.WATER —102Z. Y MBA i Carveriten YEE Mort: ELO s POTASSIUM IODIDE SOL- Vork, Pa. АБ. TION.— : Sr Louisa one SMaun-Chica go, ZZ. — ү | Romina BYRD TOOK TWO ICE BOXES TO | THE .SOUTH POLE. TO KEEP FOOD FROM | FREEZING!— Perry Schlack, Inglewood, Cal, УРАР | Dy онен unre |, и 2, а = Ы EAM 29155 Mea АР: AAS, | EER АЙ AREON ЫЕ Т diamond will Split A ari) British tach is 136 yard or 2.53 cez- 10 THE APPARENT MOTION OF = Timeters) N: c | ЖОО i histon Малл |. Den Camp, Portland, Ore, | ne SON ота сараа р, ONE DOLLAR vwill be paid by Nic Sprank for oddities of science sed on this page. Send in your ideas—no it to the number of suggestions you may make, but be sure to enclose proof of your statements. Maybe your ideas will be better than those shown on this page—if they are, Nic Sprank wants them and will be glad to send you a check. Address suggestions to Nic Sprank, care of Modern Mechanix and Inventions, 529 South Seventh Street, Minneapolis, Minn. Inventions for February 43

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eMAKEUP SECRETS of In transforming Karloff into a mummy, Pierce encountered greatest difficulty in making up the hair, On top of a layer of liquid grease paint, which acted as a base, was patted a mix- ture of beauty clay and fullers’ earth, which was then dried. by JAMES BOWLES ROM the depths of an ancient casket a bony and shriveled hand stretched back across history thirty-seven centuries to snatch a scroll from a terror-stricken actress. Deep, gray lines of age streaked the hand. Dust fell from ancient fingers. Yet it moved, actually grasped the parchment, and disap- peared from the screen. 44 This terrifying scene trom "Im-ho-tep" shows Karloff as he appears in his mummy makeup—an exact duplicate of real mummies found in ancient tombs. In photo at top Pierce is seen applying the first layer of makeup— cotton and spirit gum—to Karloff’s face. Outside the camera angle sat Boris Kar- loff. It was his hand whose antiquity the camera revealed, a hand “mummified” earlier in the morning by Jack ‘Pierce, movie make-up expert, who recently pro- duced a living mummy in the person of Karloff, complete in 1500 feet of rotted cloth bandages, wrinkled skin, closed eyes and the yellow hair of a person dead many centuries. The “mummy” represented the latest First step in "mummifying" face was application of special gum; second, plastering skin with layer of glue and cotton. Modern Mechanix and

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eMovie SJORROR Pictures When you shudder at the sight of fright- ful characters in horror movies, it is usually the makeup man who is responsi- ble for your thrills. Read here how he creates actors that terrify you. A&bove—Jack Pierce, expert Hollywood makeup man, giving bony shriveled ap- pearance to hands of Boris Karloff, em- ploying all scientific devices of his art. At left is seen Karloff ready to appear be- fore the camera. Note carefully the matted, mud-encrusted hair, the wrinkled blood- less looking face, and the sealed eyes. achievement of the movie make-up artists, who strive constantly for new and novel means of bringing striking figures—living and dead—to the screen. On three differ- ent occasions Pierce turned Karloff into either a part or a whole mummy, counter- part of the first mummy ever created. Few persons realize that mummy-making combined science and art among the Egyptians. Pierce searched thirty-five vol- umes of Egyptian history in his quest for authentic background for this bit of make- believe. “Who,” he asked himself, “was the first man mummified, what was used, how Third step: Second layer of gum is brushed on cotton to preserve wrinkles. Fourth: Grease paint applied to cheeks brings out high lights before the movie camera. Inventions for February To provide last word in realism, Karloff, for his appearance in the movie story of Egyptian reincarnation, was wrapped in shroud of charred cheese cloth, which was later brushed over with caked mud. In the filming the mud crumbled off when mummy rose from its ancient coffin, coming to life after some 3700 years. was he wrapped?" All the information he could dig up gave only a suggestion, not a solution of Pierce's problem in turning Karloff into a duplicate of Osiris for *Im-ho-tep," in which picture the mummy comes to life. Manifestly em- balming fluids and perfumes have no place in makeup for the camera, so for a month Pierce experimented with pigments, paints, drying materials. He had to have a rotted cloth that would not fall from the body, yet would crumble easily when the body stirred from its coffin. The face must look very old and withered and dry. The eyes must be closed, yet seem to see. Ап assistant spent a week feeding double- weight cheese cloth in two widths—two and three inches—through a barrel-like cylinder over a gas flame; winding it gently over a turning wheel. This cooked and 45

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Movie-goers Love Weird Characters— "Frankenstein" Big Money-maker Makeup man at work comb- , ing out wig on special "gin." Silk milling gauze makes hair. When characters in a movie are seen to grow old in the story, the makeup man is the one who applies the aging process. Here makeup expert is painting on lines of age. пие the cloth without actually burn- ing it. Pierce experimented with 20 dry colors until at last he looked down into his mixing pot on exactly the yellow-gray color with which good mummies are covered. Burnt umber, light umber, fullers' earth, other colors, glue and hot water combined to produce this mud-like substance. With a little cotton and the standard make-up pig- ments Pierce was ready for the big job— a seven hour ordeal—of turning back the . pages of time 3700 years, all for a five-min- ute effect on the screen. . 46 You remember that thriller "Frankenstein." Here Pierce is at work making a monster out of Karloff. Here's an unusually delicate job for the makeup man— "growing" a beard, hair by hair, on Erny Westmore. “Wrapping Karloff,’ Pierce told me, “was the hardest job Ive faced during twenty years in the motion picture busi- ness. Cooking the cloth gave it the appear- ance of cloth that had rotted under the earth, but it had become so fragile that it sometimes fell apart in my hands. “Yet it was necessary to wrap himin three directions—around, vertically and diagon- ally—so the layers would not separate and reveal his skin. Despite these three layers, when he opened his eyes and moved from his casket, the outer layer crumbled like a thick layer of caked mud and disappeared in a small cloud of dust.” Caked mud really covered the bandages, having been brushed over the cloth. The glue held it together after it had dried, the water gave it the necessary moisture to permit working the colors. Yet the startling and grotesque effect came not so much from the decayed appearance of the body, as from the hands and face. Here was a triumph of movie makeup, as great as any Modern Mechanix and

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Makeup Men Can Change Race of Actors, Even Make Over Elephants Movie makeup men can even change the race of an actor. George O'Brien, the actor at the left, has been made up to look like two Indians, from whom he can't be distinguished, Right—By addition of large ears an Indian ele- phant has been transformed into an African elephant for “Tarzan.” ever attained by the immor- tal Lon Chaney. Pierce first brushed Kar- loff’s face with a special gum, a secret formula, that retained its moisture so long as the makeup remained on the actor. Over the gum he plastered a thin layer of cot- ton, specially prepared for this typeof work. After the cotton had "set" in the glue, with a pair of tweezers, Pierce pulled out the ex- cess, leaving little valleys where he planned to create the lines of antiquity. Thirdly, an- other layer of gum was brushed on the cotton, this to hold the outside in exactly the same position as created by the tweez- ers. While the face was drying under the hot blast of an electric heater and fan, Pierce turned to the hands. The same pro- cess served here. Actor's Face Made to Look Dead Having destroyed all life in the face—in fact, having quite obliterated its human re- semblance—Pierce found he must restore something of a human quality. A layer of ordinary grease paint supplied an appear- ance of skin and normal pores and enabled him to deepen the lines in the cotton with a dark brown pencil. This accentuated the deep crevices. Now a lighter shade of grease paint, spot- ted on the cheeks, brought out the high lights and depths so essential for the camera. Technically the most difficult problem came in making up Karloff's hair, for Pierce found he must turn the natural black into an aged yellow. No wig would do here. Inventions for February Recognize the actor above? It’s Jean Her- sholt in a distinctive makeup — in fact, a masterpiece of the makeup man's art. Note tousled hair, furrowed face, scraggly beard. To determine whether any flaws will register on the film, cameraman must study makeup of characters through his blue glass, as demonstrated here. Nils Aster is the actor. A layer of liquid grease paint, neutral in color, supplied the base. On top of this was patted a mixture of facial beauty clay and fullers’ earth. All of which transformed the top of his head into a dirty matted yellow, exactly as the hair on mummies found in recent years looked after nearly forty cen- turies under the earth. Final touches for such an exacting make- up are applied after the actor reaches the great sound stage. There Pierce completed wrapping Karloff’s legs together and sealed his eyes closed with rice paper, leaving a little horizontal valley in the center of the (Continued on page 145) 47.

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-62-lb. Steam Plane Motor Burns 6 Cents Per Gallon Fuel Harold Johnson, inventor, working on his steam-powered motor which turns a standard OX-5 propeller at 1,250 r.p.m. in silence. Fuel is furnace oil costing 6 cents per gal. Hot Water Cure for Insomnia NEW way of curing insomnia by hot baths to the arms only instead of to the whole body has been devised by a German physician. To use the arm-bath method, the victim of insomnia is laid on a narrow ‘bed or bath table so that both arms can lie in hot water at a temperature of about 95 de- grees, Fahrenheit. The temperature of the water is then raised slowly until the bath reaches 110 or 115 degrees. After a few minutes the patient is put to bed. ТИ: long search for an improved airplane motor of high efficiency has resulted in the development of a steam-powered motor . which the inventor, Harold C. Johnson, of Akron, Ohio, claims is far superior to the gasoline motors currently in use. This new engine, which is shown in the photo at the left, is of a two-cylinder op- posed design and weighs but 62 pounds. The power it can develop is disclosed in the fact that it can turn a standard OX-5 propeller at 1,250 R.P.M. with complete silence. For fuel, the engine uses a No. 2 grade of furnace oil, costing only six cents a gallon. High pressure steam is generated in a novel coil and heat for evaporation is furnished by a closed type bunsen burner. Stabilizers Fly Plane Pilotless ANDS off flying as long as the gas holds out is now made possible by the inven- tion of the new automatic stabilizer shown in the photo below. The basic elements of. the new system are a set of small rudder-like appendages which attach to the underside of the wing and to the lower part of the fuselage, where the lower wing of a biplane ` should be. The inventor is Dr. C. H. Vance of Po- mona, California. In a severe test of the device, a pilot took off from the Glendale, Cal. airport, put the ship through a series of maneuvers and performed a number of gymnastic stunts on the wings, fuselage and landing gear. Throughout these stunts the plane flew as steadily as if a veteran pilot were at the controls. Thanks to this stabil- izing system, efficient radio control may become possible. Dr. Vance is here shown pointing to the stabilizers on wings and landing gear which permits the ship to fly pilotless. 48 Modern Mechanix and

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“Pneumatic *«Gubes “Replace Shell Caissons “RECEIVING SHELLS АТ FRONT LINE TRENCHES ^ In this new ammunition transportation system proposed by military experts, shells are sent from the ammunition dump behind the lines to the artillery emplacement through pneumatic tubes buried underground. Compressed air delivers the shell ready for firing. Е RANSPORTATION of big shells fur- nishes one of the greatest difficulties of modern warfare. Military engineers are now cudgeling their brains for a scheme to overcome this obstacle, and what might be called the “pneumatic tube caisson" has been the result. Plans drawn up at a recent conference of military experts call for the construction of a long tube between the ammunition dump behind the lines and the artillery emplacement at the front, as illustrated in the artists drawing above. The ammunition is fed into the pneumat- ic tube at the dump, after which the com- pressed air is applied to drive the shells to the front. It is believed that this transpor- tation scheme will prove far more reliable and certain than the customary method of hauling the shells with trucks and horses. SENDING STATION BEHIND THE Li Table Deals Bridge Cards TE latest aid for the expedition of bridge games is a machine which shuffles and deals hand of cards to the players. An in- terior and exterior view of the table is shown below. When the cards are gathered up after a hand, they are placed in a slot. After this a mechanical arm operated by a motor picks up the cards one at a time and delivers them, shuffling them en route, into a special compartment at the players’ finger tips. The machine never deals and shuffles twice in the same manner, and it will never cheat you as a human being might be tempted to do. .The players pick up their hands from the apertures at the side of the table, as illustrated below. One hand can be played while deck is being dealt for next game. Cards are delivered to players through apertures in the table.At right is seen the shuffling mechanism, which never cheats. Inventions for February 49.

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Bath in Ocean of Soapsuds Is Latest Reducing Method The new "bubble bath" in operation. The waterproof pump on the floor undulates water in tub like ocean surf. Addition of teaspoonful of soap causes heavy foam to rise. How to Grow Magic Salt Flowers Be flower-like forms can be grown upon a pebble, a small lump of coal, or any solid non-absorbent object if you fol- low these simple directions. Place the peb- bles in a glass bowl and sprinkle over them two tablespoonfuls of salt. Over this sprinkle two tablespoonfuls of water; and then, two tablespoonfuls of bluing. One day later repeat the sprinkling of salt and water, leaving out the bluing. On the third day you can do the same. If you want colored flowers sprinkle over the mix- ture a little mercurochrome. Set the bowl aside in a place where it will not be dis- turbed and in ten days or two weeks the crystal flowers will have appeared. Capil- lary action and evaporation does the trick, the saline water being drawn to the top of each layer of crystals and there evaporated to deposit new crystals. Here are seen the magic salt flowers growing on pebbles in a glass dish. Ingredients for the trick are salt, water, bluing and mercurochrome, procurable at any drug store. 50 арама іп the clouds has nothing on the “bubble bath," the latest novelty in the way of health gadgets. This device con- sists of a waterproof electric motor and pump, which connects with a series of long perforated metal tubes placed in the bottom of the bathtub.. Air emitted from these tubes causes the water in the tub to bübble and splash like a miniature surf. By the addition of a teaspoonful of non- alkali soap a heavy foam will form as dem- onstrated in the accompanying photo. The device has received the approval of emi- nent medical authorities both as an invigor- ating bath and as an effective reducing process. Device Gives Beauty Measurements ROM Hollywood comes, quite appropri- ately, a machine to calibrate beauty. The purpose of the gadget, shown below, is to measure to the thousandth of the inch the contours of the face, so that the requisite dimensions for beauty can be determined. Just at the moment, Miss Shelia Terry, actress, is undergoing careful calibration. 'The males in the photo are Max Factor and Parc Westmore, inventors of the contrap- tion. = The new beauty calibrating machine which measures to the thousandth of an inch contours of actresses” faces. Careful adjustment gives facial dimensions of famous good lookers. Too Much Nudism Is the Bunk RGUMENTS for last summer’s fad of nudism based on the theory that the absence of clothes is good for health, are exploded editorially in the New York City medical periodical, American Medicine. Reasonable exposure of the skin to air, sun- light and the water of rivers or the sea has full medical support. Old-fashioned heavy and impervious clothing was condemned long before modern ideas of nudism were thought of. The point made by the medical editors is merely that it is not necessary to expose all of the body to air or sunlight or to expose it all of the time. The authorities are skeptical also of the moral and mental benefits claimed for nudism. Modern Mechanix and

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Scanning cMethod Brings Gelevision Movies 1 CONTACT -| ỌHOUSING T FOR: ARC LIGHT Basic elements of the new Jenkins television system are seen here. The moving scene is built up in the chemically coated plate by the brushes on the scanning discs. The contro! plate acts as a slide in a magic lantern except that the scene is in motion. Pictures are clear as movie films. TE progress of television has long been retarded by the lack of an efficient light source which could react instantaneously to- the fluctuations of incoming radio cur- rents and at the same time be powerful enough to project the image upon a large theatre screen. This difficulty, however, has now been overcome by íhe development of a new scanning method which promises to equal or excel the movies as a source of home and public entertainment. This new method dispenses with the neon tube altogether and utilizes as a source of illumination the arc light of the conventional projector. New “Control Plate? Is the Secret The heart of the new system is a “picture frame," or “lantern slide," a small glass plate on which the actual moving scene being broadcast is created. This plate is covered on one side with a fine wire mesh impregnated with an electro-sensitive sub- stance which renders the glass, normally opaque, transparent when an electric cur- rent is passed through it. A scanning disc is used to provide the electrical disturbance necessary to render the plate transparent. This disc, shown in the artist's drawing above, is made of clear glass with 60 fine wires radiating out from the center like spokes from a wheel, each wire terminating in a tiny brush. These brushes are arranged in a spiral curve, sim- ilar to the holes in the metal scanning disc of the conventional television system. Each brush is spaced from the next by a distance equal to the width of the chemi- cally-coated glass plate. Then while the disc makes a single revolution, the sixty terminals sweep the plate one after the Inventions for February C. Francis Jenkins, inventor of the revolutionary television receiving system, demonstrating a receiver developed by him. other, with 60 slightly curved parallel lines, each a short distance apart, until the plate is covered from top to bottom. The speed of the scanning disc is synchronized with the transmitter at the broadcasting station. The chemical coating on the plate, under the influence of the electric current from the passing wire terminal of the disc, be- comes transparent in a varying amount, according to the intensity of the incoming radio signals. With these 60 brushes sweep- ing the plate 15 times a second, the speed of the disc, a moving picture corresponding the scene at the transmitter is built up. The light passed through the changing transparency of the control plate is pro- jected upon the theatre screen just like any moving picture. ol

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Sleep Outdoors With Home Comforts in New House Tent 4 L This house tent affords utmost comfort to cutdoor sleep- ers. Foremost are the roller blinds used for sun and rain. They cover all screening and may be regulated from within. Three Marks of True Nightmare. HERE are three significant character- istics of a true nightmare. One is an agonizing dread, probably a greater terror than any other kind of fear or horror, real or imaginary, ever experienced by human beings. A second is a feeling of being suf- focated, as though an enormous weight were lying on one’s chest. The third is a feeling of complete paralysis, not only affecting the muscles of legs and arms but making speech impossible. Unless a per- son feels all three of these definite sensa- tions, he is only experiencing a bad dream. Machine Weighs and Marks Eggs GGS may be marked, weighed and as- sorted into weight groups by a new invention which has just been introduced in Germany. As the eggs pass through a slotted groove, they come in contact with a rotating, bell-shaped container. This leads them over balances where they are weighed. They next pass under a stamp which marks the weight, date and name of dealer; then on into compartments cor- responding to each weight group. | eee AROSE se х i Dus oo CYLINDER om STAND с. iL —À Eggs are marked, weighed and separated into weight groups by this machine, "which handles 60 eggs per minute. 52 HE latest development in house tents brings to the user many novel features of home comfort. The tent roof as illus- irated at the left is separated from the rest of the structure by a ten-inch parti- tion of screening permitting wonderful ceiling ventilation. The upper half of all four walls are screened also, providing ad- ditional air circulation and protection against mosquitoes. The screen windows and door have rol- ler blinds attached. If you are awakened ‘from a sound sleep by coldness, a rising high wind or a torrent of rain, all you need do is to release the blinds from in- side the tent. They roll into place cover- ing the screening. These same blinds may also serve as sun shades in the midst of a hot day. How to Make Embossed Stationery Resin is sprinkled on ink and held over flame to melt. [uw d engraved stationery, in which the printing stands above the surface of {һе paper in a gloss finish, can be made at home quite inexpensively with a rub- ber stamp outfit. The type is set up in the holder, and a pad made of several thick- nesses of cloth to hold the ink. The latter is made of any color of regulation print- ing ink, thinned with wintergreen oil and smeared on the pad. Ink the stamp on the special pad, and print up about a dozen sheets of the sta- tionery. Then, with a salt shaker, sprinkle a small quantity of powdered resin over each, blowing off the surplus that does: not adhere to the printing. To finish the sheets, hold them over a gas burner. Modern Mechanix and

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Two-way Radiophone for Duty in Riots, Fires and Cave-ins OR emergency mobile communications over short distances, a new portable ra- dio transmitter and receiver known as the "transceiver" has been introduced. The last word in compactness the cabinet con- taining the station is mounted on a tripod as illustrated in the accompanying photo. For an aerial, all that is needed is a wire strung to a post, tree or wall near by. The total weight, including the batteries, is only 22 pounds. These “transceivers” are expected to find a ready use in police work where mobility and adaptability are especially important. In subway disasters and tunnel work these instruments will prove highly serviceable. Eat Your Breakfast on the Train Eon the benefit of those sleep lovers who can't get up in time to eat breakfast at home, a new stunt in perambulating dining rooms should prove a great boon. Going on a suggestion from a commuter, the New York, New Haven and Hartford Railroad has put in service between New Haven, Conn., and New York City, a cafeteria car which serves breakfast en route. The photo below. shows the interior of the car, with a group of commuters partaking of the meal which they missed at home. Commuters aboard New York, New Haven and Hartford cafeteria car partaking of breakfast which they missed at home. All trains will carry these cars if idea proves successful. War Deaths Deepen Depression ONE chief cause of the depression is ad- mitted to be world-wide fear, lack of confidence and unwillingness to take even the slightest chance on the future. A new theory of why this despairing psychology exists at all was suggested recently in an address in London by Sir Ernest Benn, English publisher. It is an inevitable result, he believes, of the fact that so many young Europeans were killed in the war, leaving world busi- ness to be directed largely by conservative and timid oldsters who normally would have given place long ago to younger and more courageous men. Most of the war deaths were of men between twenty and thirty, who now would have been between forty and fifty. Inventions for February Here’s the new “transceiver” set up ready for operation. Mounted on tripod, outfit weighs 22 Ibs. and proves ideal for police work, fire fighting and tunnel disaster rescue jobs. Easily Made Glareless Mirror BE glass or ordinary glass painted black on one side will make a very use- ful glareless mirror for automobile drivers when driving at night. The glass should be cut to the approximate size of the rear-view mirror and secured there with a’ pair of paper clamps as shown in the illustration. Of course, this device is most valuable when the rear-view mirror is of the non-glareless type which reflects the headlights of fol- pus cars in the driver's eyes, blinding im. Glass for glareless mirror is cut to size shown here and Painted black on one side, secured in position with clips. 53

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Engineering GENIUS Fights The aftermath of a snowslide which occurred at Bingham, Utah, in Feb- ruary, 1926. Rescuers are seen dig- ging out victims of the avalanche. The avalanche, nature’s most destructive mons- ter, now submits to the intelligence of modern engineering genius, whose methods of con- trol are explained here. Striking photo above shows how an avalanche swept a path through a wood on the slope of a mountain. by CALVIN FRAZER 6éé¢QNOWSLIDE Hits Train; One Dead, "Four Missing.” “Colorado Snowslide Buries Four Miners.” “Twenty-one Italian Soldiers Killed by Avalanches.” “Thirteen Ski Tourists Perish in Avalanche.” These four headings were selected at ran- dom from a large collection of newspaper clippings, all of recent date, relating to dis- asters due to the terrific cataracts of snow that sweep down the steep slopes of moun- tains in all parts of the world; often with dire results, though fortunately the vast majority of these slides are harmless, either because they occur in unsettled regions or ы because various protectivemeasures against These denuded and splintered trees are part of the wreckage them have been taken by mankind. from: an avalanche wind, generated by the displacement of i 1 E i e- air in the front of a snowslide. Such winds reach forces People who live in non-mountainous re greater than hurricane. Entire villages have been devastated gions may think of the avalanche as a some- by avalanche winds, though untouched by snow. . .. what rare event. It is true that destructive. 54 ..Modern Mechanix and

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the ‘Destructive Avalanche avalanches do not occur every day, but those that have no serious consequences and hence fail to get into the newspapers descend the mountains of the globe by the millions in the course of a year. It is easy to see why this must be so. А mountain, because it projects up into the colder regions of the atmosphere and especially because it forces the winds that blow against it to rise, cool by expansion and shed their moisture, is а great collector of snow as compared with the surrounding plains. Of the snow thus gathered part is removed by evaporation, part melts and flows down as water, and part, gradually compacted into ice, creeps slowly down in the form of glaciers. Some is also blown from the peaks and higher slopes by the winds, but a vast amount remains to be removed by the speedier process of the snowslide or avalanche. Roof Slide Is Small Avalanche If you live in a snowy part of the country you will probably witness avalanches on a small scale this winter on sloping roofs in your vicinity. The snow may become saturated with water until, no longer able to adhere to the shingles beneath, it slides off and thuds to the ground, or again, in colder weather, it may remain dry but eventually accumulate in such quantities that some slight jar will start it down. The same two varieties of avalanche occur in mountains. The former is called a *ground" avalanche, and is commonest in spring; the latter, known as a “dust” ava- lanche, is confined mostly to winter and consists of dry, powdery snow, great clouds How mountain winds pile ир, snow to huge depths on mountainsides. Drawing above shows how terrific avalanche winds are created. In Switzerland, a mountainous country, elaborate Precautions must be taken to guard against avalanche disasters. Photo at right shows rows of stakes driven into the ground to break up and re- tard snowslides, On mountain railroads both in Europe and America, tunnels and snowsheds such as the one shown above furnish a partial protection from the unstable snowfields. Avalanches descend upon roof, leaving tracks clear for fast trains. Construction of sheds must be substantial and bracing secure to withstand the crushing fury of thousands of tons of snow. Inventions for February 55

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Barriers Built of Stakes and Stone Walls Check Avalanche Movements Remarkable photo shows snow sliding down Mount Rainier, Wash- ington. Mass of snow started down the 4000 foot cliff in background. To check movement of sliding snow and to protect village at foot of mountain, engineers built these stone barriers. “56 Photo above shows how Alpine inhabitants build wedge- shaped stone walls for protection against disastrous slides. Overhanging masses of snow endanger automobile traffic in mountainous countries. Above workmen are shown shoveling snowslide accumulation off Mt. Evans highway near Denver after blasting with dynamite. of which fill the air as the mass sweeps down from aloft. In either case the amount of snow set in motion is often enormous. In the Alps, for example, one authority esti- mates that the average moving mass of an avalanche is something like half a million tons. The descent of such huge masses of snow would, of itself, account for the remarkable feats of destruction accomplished by ava- lanches, but another destructive agency involved in these events is the *avalanche wind," due to the sudden displacement of air in front of the descending mass. The air thus displaced rushes not only straight forward but also on either side, uprooting trees and causing other striking physical effects far beyond the area covered by the avalanche itself. The avalanche wind is probably not exceeded in fury by any other natural blast on earth, tornadoes included. Alpine villages have been devastated by this wind though untouched by the descend- ing snow. : Safeguards Against the Menace Against avalanches, as against wind- storms, earthquakes and most other de- structive phenomena of nature, the in- genuity of man has gradually devised a number of safeguards; especially in the Alps, where methods.of protection against avalanches constitute a highly specialized branch of engineering. In Switzerland warnings of weather conditions favoring (Continued on. page 144): Modern Mechanix and

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Cfishermen "Now *Radiophone to &Jamilies C TEL TO LAND STATI RADIO LAND STATION CONNECTS WITH CITY BUTTON PRESSED FOR TALKING— RELEASED FOR LISTENING RADIO TELEPHONE TRANSMITTER- RECEIVER to the development of this new fishing boat radio, which connects with the land through the circuit shown here. EEP sea fishermen spend a large portion of their lives isolated on the ocean, out of touch with land for days and days on end. А new two way radio telephone, especially designed, for installation in fish- ing boats has now broken down this barrier of space, permitting the sailors to speak to their friends and families ashore. How the combined receiver and trans- mitter operates is illustrated in the artist's drawing above. No trained radio man is necessary to put through a call. The fisher- man simply presses a button and connects up with a land station, which hooks him up to the city telephone system. Engineers are planning on installing many of these in- struments on American fishing boats cruis- ing the East coast areas. Fishermen are no longer isolated from the world, thanks TELEPHONE SERVICE Germs Found With Triple Nature GERM that can change into at least three different shapes, causing serious human disease.in all of them and puzzling the bac- teriologists who have been looking for three entirely different germs, is described by the United States Public Health Service. Some of these germ buds seem to be so small that they are entirely invisible, ap- parently forming the third form of the germ and probably explaining many otherwise mysterious cases of human infection. The quick-change germ was obtained from the: blood of sleeping sickness victim. New Machine Shuffles, Deals Bridge Hands Automatically in One Second When deck of cards are inserted in this new shuffling machine, the deck is dealt out at four hands in a second. Inventions for February NSTRUCTORS of Electrical engineering at the Massachusetts Institute of Tech- nology have invented a new card dealing and shuffling machine which will take a pack of cards, shuffle them, and deal them out at the rate of four hands in one second., The machine, shown in the photo at the left, stands only six inches high and weighs less than two pounds. The machine runs by electricity and is automatic, in that it starts as soon as the cards are inserted in the dealing slot and stops when the dealing is completed. The inventors are shown with their crea- tion in the photo. At left is Edwin L. Rose, at the right Prof. L. F. Woodruff. both of the electrical engineering department of the Institute. 57.

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New Engraving Machine Makes кш Cuts in Half Hour A machine which may revolution- ize the art of photo-engraving. Halftones may now be made on it in thirty minutes instead of the thirty-six hours required by old methods. Electric eye does the work. Device Forms Irregular Curves NEW irregular curve instrument now being marketed is a great aid to drafts- men, artists and mechanics. They need no longer depend upon fixed curves that sel- dom contain the curve needed, or adjust- able curves that require skill and patience. The device automatically forms perfect irregular curves by simply adjust- ing a slide. It may be reversed to form opposite curves or, turned end for end, form кю? or “OG” curves. The steel drawing edge is backed by a strip of rubber that acts as a rest for the fingers and grips the paper when drawing. Rubber Used in "Acidseal" Paints NEW line of rubber paints now on the market have as a base a commercial form of rubber isomer which imparts valu- able properties not found in ordinary paint films. They have the following advantages: (1) Exceptional properties of adhesion. (2) They dry in one hour to a hard, firm film but retain to a remarkable degree the elastic properties of rubber and conse- quently conform to the expansion and con- traction of the support. (3) They provide a protective coating that minimizes the cor- um action of acids, alkalies and chemical umes The irregular curve, shown in this photo, forms perfect curves by simply adjusting a slide. May be reversed to form Opposite curves. 59 HE latest wonder of the electrical age is an automatic photo-electric color engrav- ing machine. Shown in accompanying photo, the device is destined, inventors claim, to revolutionize the art of photo-en- graving and its associated industries. The machine.is able to scan rapidly by means of an "electric eye" a photograph or painting in color and to engrave automati- cally in zinc sheets, “cuts” in three colors. The entire process takes less than thirty minutes instead of the thirty-six hours re- quired by previous methods. The photograph to be reproduced is mounted on a revolving cylinder which passes it in front of the electric eye, upon which impinges a brilliantly concentrated spot of panchromatic light thrown from two lamps. The faint electrical impulses set up by the electric eye, averaging a ten- millionth of a watt, are amplified up to a third of a horsepower to operate a sharp en- graving tool. Anti-bandit Blind Foils Robbers OR protection against robberies, an anti- bandit blind has been designed to pre- vent smash-and-grab raiders from entering jewelers’ and furriers’ shop windows. The blind, shown in the photo below, auto- matically closes with terrific speed if the display window is touched by any object likely to break it. Once closed, the blind is exceedingly hard to break through. Ап alarm bell attached to the device rings furiously once the window is tampered with. Display windows equipped with this automatic anti-bandit blind are safe from smash-and-grab raiders. If window is touched by any object likely to break it, the blind closes. Modern Mechanix and

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Screening Gierce “Battle Cannibalistic battle between protozoa that goes on in a drop of water will be projected on the screen through a high-powered microscope as illustrated here. Tiny combatants are normally invisible to naked eye. OU might not believe it, but ferocious and cannibalistic battles are staged every moment of the day in the drops of water that make up the rivers, lakes and oceans of the world. A few of these battles are to be brought to the screen for the amusement and amaze- ment of visitors to the-Hall of Science at the 1933 World’s Fair. What will make this feat possible is a special projector which throws on the screen in a greatly magnified in “Drop of ‘Water scale what is seen at the eyepiece of a pow- erful microscope. ~ Drops of water containing various species of unfriendly protozoa will be joined on the slide under the microscope connected with the projector. The battle to the death will be primitive and unmerciful, for protozoa are hungry and they ask no quarter and give no quarter. The artist's drawing above shows how the projector and screen will be rigged up for the show. Streamlined Car Aids Railroads With Cheapest, Safest Transportation Torpedo-shaped bullet car which will solve rail troubles. Inventions for February HE long a waited first step in the solution of the perplexing problem that now con- fronts the nation's railroads is promised by the sponsors of a new torpedo-shaped vehicle recently introduced. The car, shown in the photo at the left, is said to offer cheap, regular and safe trans- portation on all main lines. It is approxi- mately 60 feet long, seats 42 passengers, and is capable of a speed of 70 miles per hour. The “autotram,” as it is called, has a fully. streamlined body, with a round bow and a wedge-shaped stern. The entire passenger compartment is insulated and sealed against heat, cold, dust and noise, all ventilation being provided by means of special air con- ditioning system which changes the air every three minutes. The car is the product of the Clark Equip- ment Co., at Battle Creek, Michigan. 59

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Automatic Trap Door in Car Roof Prevents Head Bumps eae | This new British made auto is equipped with automatic trap door in the roof to prevent bumping the head. The hinged part swings upward with opening of car door. Hand Works Tiny Sewing Machine TINY sewing machine which really works exceedingly well is now being marketed by a Bridgeport, Connecticut, ` firm. It operates almost exactly like the larger type and comes equipped with a clamp by which it may be conveniently at- tached to any table. The power is supplied by a hand wheel, as shown in the ac- companying pho- to. It can't be beaten as a toy for little girls. "They receive much pleasure as well as plenty of worth. while ex- perience. "Tiny sewing machine, above, is powered by haad turning wheel. Lowliest Microbes Have Memories RECENT experiment by a French bi- ologist led him to believe that memory exists in all living cells, even to the low- liest microbes. The experiment proved that small nervous stimuli, like a- weak light in the eye or a feeble touch to a nerve, although too feeble to produce in- dividual reactions, will do so if repeated several times. The microbes react similarly to each successive stimulus. 60 HAE you ever bumped your head while getting into or out of an automobile? If so, you undoubtedly will be greatly in- terested in a recent invention coming from England The Riley Lincook cars so. popular in Britain, are now. equipped with automatic trap doors in their roofs, as shown in the photo on the right. The part of the roof frequently bumped by heads has an ar- rangement similar to a hinge. When auto- mobile door swings open, hinged part of roof is thrust upward to a vertical posi- tion permitting driver to leave the car without striking the edge of the roof. As door is shut, the device is lowered into place. Such an arrangement is especi- ally valuable in a car built close to the ground. An automobile of this type is rather hard to get into and out of due to the necessity of bending down. Measures Millionth of an Inch N APPARATUS which permits engi- neers to feel the difference in the length of metal blocks of two millionths of an inch was recently demonstrated be- fore a national conference of gauge and measure experts at the headquarters of the American Standards Association in New York City. - The purpose of the conference was to bring about international uniformity in the units of length, the inch and the milli- meter. Johannson’ ‘of the Ford Mo- tor Company is shown with the new ap- paratus in photo below. Here is new instrument which permits engineers to feel the difference in the length of metal -blocks of two millionths of an inch. It will improve and speed construction work. Modern Mechanix and

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Airplane Jnfluence in Speed “Boat Spray deflectors of airfoil section serve two purposes; give lift and keep boat free from flying spume and water. PEEDBOATS have for many ears been the subject of attack by inventors. Many of the so-called “solutions” are merely brainwaves such as wheels in water for the boat.to run on and so on. The'readers of MODERN MECHANIX AND IN- VENTIONS will immediately recognize something rational in the above solution, which is a development of exist- ing elements, put together in a new way so as to achieve new comforts, new speed and utter dryness. The hull is of a thick wing section above the water, and has a flat bottom with step placed far to the rear in accordance with the new thought in hydroplaning surfaces. Instead of a cockpit in rear of a roaring motor, the motor is placed just abaft the step, and is geared to the propeller. The exhaust pipe is louvered to induce extra speed of exhausting the hot gases, with some idea apparent in an attempt to speed up the air behind the boat. Whether this is awry or not hasn’t been proven, but it would seem to us that this element is not practical, Certainly the matter of having the pas- sengers forward in а deep, well faired cock- pit, out of the way of noise, is a distinct advantage. Another thing designed to serve a twofold purpose is the brace of small spray wings on either side of the hull, which serves to kill off flying spume and water, Inventions for February HULL HAS AIRFOIL E N Here's a section through the novel speedboat built by a New York inven- tor, giving an idea of the new arrangement. step section short, and the flatter forward plane is considerably less bumpy. GEARED ENGINE AIR AND WATER RUDDER STEP PLACED TOWARD REAR The fore plane is long, the and at the same time help not only the air resistance by more gently opening and closing the flow of air, but possibly obtain- ing some planing lift by a wind action. Some years ago Dr. Alexander Graham Bell experimented with a speedboat which had hydrofoils or steel stepladders on the bottom of the hull. It was a large boat, nearly eighty feet long, and had for power two 450 h.p. Liberty motors. Amazing speeds were attained, some in excess of 80 miles an hour, and from that time on, in- ventors have been trying to adapt airplane principles to speedboats, but with little success. It must be remembered that the medium, air, which airplanes depend upon is 1/800th the weight of water, and that an airplane goes through the medium, whereas a boat goes over the surface.. Hence any improvement should take into account the two factors—air through which the boat goes, and water on which it rides. This boat seems to have been an intelli- gent attack, capable of comfort and real speed, and is, as you will agree, very stylish and striking in appearance. . . 6l-

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Here's the new “Tell-U-How” cocktail mixer which shows you ingredients for your favorite drinks, and measures contents. This new contrivance at- taches to a milk bottle and converts it into a convenient little pitcher for the dining table. At tight is seen Mr. "Picka- doodle,” who bends down and with his magnetized beak picks up pins or wife clips. His feet are springs. Housewives with gas stoves will welcome this new sandwich toaster recently put on the mar- ket. It consists of two plates between which the sandwich is placed for the toasting. Manu- facturers claim the job is done in one-third time taken by electricity. The square base sets over the gas burner in the toasting process. Note . Ideal for small apartments is a small elec- T 3 r р tric washer now on the market which prepares the ingenious ball joint for reversing the the washed clothes for the line without the use of a plates. Wooden handles give adequate іп« wringer. Concealed in the top is a soft rubber bag sulation against heat from the flames. which is expanded by water pressure to wring clothes. 62 . Modern Mechanix and

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New automatic baby feeder that may be ad- Above—Beli on bottle of dan- i p ie rude. wat gerous medicine rings warning. : : f wrist Right—New air-tight rubber of wrist. bottle stopper which seals bot- tles of catsup, grape juice, etc. A new kind of cover loosener is now Latest aid to milady’s beauty is this : available in the form of a soft rubber "Kurlasher" which curls the lashes to р ring made to slip over fruit jar covers. It make eyes more attractive. No heat à has a series of tiny teeth-like grips which is required and the device is entirely obtain an extremely firm hold on the cover harmless to the user. and loosen it immediately without straining the wrist. Inventions for February 63

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Century Old Lady Robot Writes Letters, Draws Pictures | Here is "Miss Automaton," the century old robot which draws pictures and writes letters according to the dictates of the mechanism situated at her feet. Milady Can Now Make Up in Auto AVING in mind the feminine weakness of always desiring to look pretty, inven- tors have devised a special accessory for automobiles which permits milady to do make-up jobs right in the car. The device consists essentially of a mirror which may be detached and brought up close to the face, as illustrated in the photo below. A cord which winds off a drum and which follows the light delivers juice to a bulb mounted above the mirror so that good illumination is provided. The device may also be used in case of an emergency at night as a trouble light. The receptacle fits in the dash of the car. When milady wishes to make up she simply removes this mirror from the dash and applies the powder and lipstick. Light on top provides plenty of illumination for the job. 64 роо» are not strictly a modern inven- tion. At the left is seen “Miss Automa- ton," a robot doll over a hundred years old. When a motor is geared to its mechanism, which is located under the table, the doli writes letters and draws pictures with a pen which it holds in its right hand. In the photo she is seen drawing a ship for the amazement and amusement of spectators. *Miss Automaton" now reposes in the Franklin Institute in Philadelphia, and is the gift of John W. Brock, of Philadelphia, whose father, John Penn Brock, bought the doll in 1870 in France. Champion Auto Has 59 Gadgets O LAWRENCE GRAYSON, of Los An- geles, goes the honor of having a car equipped with every accessory that auto- motive engineers could possibly devise. All told, 59 instruments are at the command of Mr. Grayson's hands, legs and eyes, as he negotiates the highways in his machine. Among the instruments is an imported time switch for operating either parking lights or a theft device which, when the car is tampered with, releases a charge of 32,000 volts at the trespasser. Also there is included an air speed indicator, a greasing memorandum dial, a radio station selector. Every conceivable gadget, from an air speed indicator to an electric thief trap, is built on this champion car. Owner, Lawrence Grayson, has been collecting gadgets 7 years. Freckles Frozen Off With Dry Ice REEZING off freckles by means of pen- cils of compressed carbon dioxide snow, often called “dry ice," is a new method of getting rid of these skin blemishes devised by an Italian physician, Dr. M. Matarasso. The dry ice, which will freeze all human tissues solid after contact of more than a few moments, is compressed into a small stick or pencil, sharp-pointed like a lead pencil. The point of this pencil of concen- trated cold then is pressed against each freckle in turn for three seconds. After the colored skin of the freckle drops off in about a week, the new skin thus disclosed is white and unmarked. - Modern Mechanix and

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So Quiet You (Can't HEAR a PIN DROP Here is a microscopic view of new sound deadening plaster whose mil- lions of tiny pores absorb sounds instead of bouncing them back into the studio, causing distortion. Radio City studio whose walls are covered with sound-deadening plaster. «о QUIET you can hear a pin drop,” is an old saying, but to make à place so quiet you can'í hear a pin drop is the ideal of the great Rockefeller Center now being built in a noisy part of New York. Efforts to realize the ideal of complete soundlessness have decided the acousti- cal engineers to plaster the walls and ceil- ing of R. K. O. theatre.and International Music Hall, which will seat 6,000, with a new sound deadening plaster made from pumice from the Imperial Valley of Cali- fornia. This kalite plaster has tiny pores and roughnesses that absorb sounds in- stead of bouncing them back into the room as shown in an accompanying drawing. Sounds originating in New York streets will be shut out of the studios by means of new Maxim-Campbell Silencers, invented by H. P. Maxim, of gun silencer fame. This device literally tires out the sound, absorb- ing it completely before it can reach the inside of the room. How sound waves rebounding from studio walls distort music entering mike. Top—sounds: are absorbed. Maxim-Campbell silencer which absorbs sounds from streets. Right—Office equipped with sound deadening apparatus. Inventions for February 65

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caster These Strength Tests Here's a way to test atm strength. Grasp hands firmly, with elbows placed on table top. At word “go”, try to force opponent's hand to table. One of the best party stunts imaginable is this balanc- ing test with arms locked and one foot held off floor. "This is a novel method of wrestling which brings into play the muscles of the arms and back. Assume the back-to-back position with knees raised close to chest. Arms are locked with those of your opponent. Fun galore may be had with this "foot boxing" test. Clasp hands underneath upraised leg and place toes to those of the opponent. Push with toes and try to force opponent off balance. First to unclasp hands is the loser. Plenty of exercise in this, besides testing leg strength. Frequent spills of contestants make this an excellent party game. A little practice will enable you to win easily. 66 Here's how you work the stunt shown at left above. 'The idea is to upset the opponent from his seated position on the floor while retaining the back-to-back position. It is possible to stand an opponent on his head. О YOU want to compare your strength with that of your friends? If you do, here are eight different methods, all simply executed, that will bring into play every muscle of the body. Master these feats and you can hold your own with men of much greater bulk, because they will have failed to develop the distinct muscles brought into use in each of eight separate tests. The first known use of one of these meth- ods, shown in extreme upper left hand cor- ner, dates way back to 1849 when a grizzled miner challenged a “dude” Easterner while both were partaking of liquid refreshments in a California saloon. The *dandy," hav- ing practiced the feat before, offered it as a test. The struggle lasted well over an hour while the two men tensed and flexed their muscles, perspiration pouring from Modern Mechanix and

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OUTDO Mightier This stunt is similar to the one shown in the upper left hand. corner of opposite page except that contestants are standing, with knees touching. Opponents Another good party stunt, one that requires power in the arms, is shown in the two views above. Participants sit on the floor; legs upraised, toes touching and hands clasping. At a signal, they exert ali of their strength in an effort to lift the opponent off the floor. If two persons of nearly identical strength take. part, the tugging is fast and furious for some time. ` - Participants stand with knees together and right arms Brasping each other's elbows. 'The left hands are held behind the back. It is usually quite a struggle before one or the other of the two contestants is pushed off balance. determined faces. Strangely enough, to the onlookers but not to the Easterner, the miner was finally overcome. The winner had developed his arm muscles and knew how to use them to the best advantage, something neglected by the miner. Master these tests and then introduce them at your next party. You will be sur- prised at the amount of fun derived by the participants as well as the onlookers. Most of the guests will not be familiar with them, and so will meet on equal ground. Inventions for February This stunt is the only one that has a trick connected with it. Hold your hand atop your head and ask anyone to lift it off. If you are of equal height or taller than the “lifter,” he must take the position shown. The strength in your arm will be sufficient to withstand the strength in both his arms, due to the extremely poor leverage. 67

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Perambulating Magazine, Paper Stand Boosts Business Paris newsdealer vends magazines from this ingenious per- ambuleting rack built up on the chassis of a toy wagon. Write Letters on Copper "Paper" RIZONANS have thought up a clever idea for getting rid of the surplus cop- per mined in the state. They are making the metal do duty as paper, and writing business and personal letters on it. The sheets are one-thousandth of an inch thick, and according to tes- timony make very substantial material for typing. Below is shown a steno indit- ing a letter on one of the copper sheets of business stationery. Business and personal correspondence is being written on sheets of copper one-thousandths inch thick to utilize metal. 68 Aen stand devised by an ingen- ious Paris paper and magazine seller holds a helpful hint for dealers in this coun- try. As illustrated at the left, the stand is built up on the chassis of a toy wagon. The rack holding the magazines can be of any design you wish. The chief advantage of the contrivance is that it can be shifted to whatever corner is busiest. A tongue on the ironi gets itself pulled when you are ready o move. New Germ Found in Musical Horns HARMLESS germs which may masquer- ade as germs of tuberculosis have been found in the metal mouthpieces of horns which musicians play in bands or orches- tras. The germs are believed to get into these mouthpieces from the mouths of play- ers who have drunk water taken from un- clean faucets. The close association with moist metal is believed to be one condition for the germs’ growth, their chemical con- stitution apparently being stimulated by contact with metal. Tray Helps Preserve Eggs, Fruit GGS and fruit are preserved much longer in a new tray that has recently been in- troduced especially for use in mechanical refrigerators. These trays, shown below, are round so that they cannot be pushed into corners to shut off circulation. The sides, you will notice, are in strip form, so that plenty of room is afforded for air cir- culation. Plenty of space for circulation of air is allowed in these trays, especially designed for use in electrical refrigerators. Lower Voltages for Home Safety COMPLETE revolution in the home use of electric power, both in the interest of economy and to do away with the in- creasing number of fatal shocks from elec- tric wires, is being urged in Europe, involv- ing the substitution of lower electric volt- ages for the 110 volts or 220 volts now commonly used. Many accidents would be avoided and household electric devices such as switches, lamp sockets, safety fuses and so on could be both cheaper and more lasting. These savings might pay for the cost of changing from the present system. 110-220 volts is used to save copper. Much larger wires would be needed to carry the same power at low voltages. Modern Mechanix and

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Fool Your Friends by Frying Eggs Over Small Cake of Ice ELIEVE it or not, but the man in the photo at right is frying eggs over a cake of ice. The eggs are fried in a minute's time and the ice doesn't even melt. Here is how it is accomplished: Beneath the table is a “Т” shaped iron core. There are 120 turns of No. 6 wire around the core. On alternating current of 150 volts, 90 amperes is used to build up the magnetizing force. This sets up a strong magnetic field which penetrates the table and the ice. By placing the aluminum fry- ing pan in the magnetic field, the pan be- comes as hot as if it had been heated on a stove. А tremendous current is built up in the metal to heat it. Trunks Equipped With Wheels $ AX age-old inconvenience that everybody has put up with for years has been eliminated by a recent invention by a Lon- don, England, man. The device is a trunk with a wheel on it, permitting the trunk to be hauled about as easily as a wheelbarrow. During recent years, shortage of servants and the high cost of human labor has increased the need for more easily movable objects. One person can tip up a trunk with this new inven- s tion and wheel it anywhere MAGNETIC ~~. LINES OF -FORCE HEAT PA Eggs are being fried over a cake of ice in photo above. with relatively little effort. The The drawing at the left shows device does away with the back-breaking job of moving a -trunk to different places with- in the house as well as saving a tidy sum when an express- man values his services too highly. Any adult can easily handle the device. ` A Flashlight for Milady's Purse OMEN will be especially in- terested in the handy little flash- light shown in ac- companying pho- to. It is called a "Purse Light," a name received be- cause of its ex- tremely small size, which permits carrying conveni- ently inside a woman's purse. The diameter is about the same as an ordinary pen, although in length it is a bit shorter. А very small battery inside generates power for a pencil light, which is turned on by pressing the opposite end inward with the thumb or finger. The gadget is handy for locating doorbells, keys, keyholes, etc., at night. The “Purse Light" is now on the market and has proven very popular with customers. IRON CORE Here is a flashlight that is han- dy for women as it will fit con- veniently inside their purses. Inventions for February how this is accomplished. The iron core beneath the table has 120 turns of wire. . On alternating current of 150 volts, 90 amperes are used. This sets up a strong mag- netic field which penetrates table and heats the pan. Sockets Attach Anywhere on Wire NEW type electric-light socket, avail- able in two sizes, can be applied directly to the stranded wire without stripping the insulated covering. Connections are made without the use of either tape or solder merely by screwing together the two pieces of the socket; one section containing grooves in which the wires are placed and then screwing the cap down tightly, where- upon two strong pins pierce the insulation and make a positive contact with the con- ductor. The sockets are very convenient for making up illuminating display sets for outdoor or indoor use. The two sizes of the new type electric-light socket are Shown above. They can be applied anywhere on the wire. 69

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NOWFLAKES—Artistic | In this record precipitation in Chepstow, England, two inches of snow fell in two minutes. F YOU have seen snowflakes an inch, or even three-quarters of an inch, across, come fluttering down from the clouds during a snowstorm, you have witnessed an interesting spectacle. However, you need not feel too much elated for, as the saying goes; “You ain’t seen nothin’ yet.” Sometimes the pearly gems of frozen moisture come down in such sizes that a single snow- flake will cover a good-sized saucer. j Sounds fishy, doesn't it? Nevertheless, it is no fish story. Such phenomena have been witnessed and recorded by reliable scientific observers in various parts of the world. E. J. Lowe, of Chepstow, England, reported three such cases. One was in January, 1838, when the largest snowflakes were about 2 inches jn diameter; one was on January 7, 1887, when the largest snow- flakes were more than 4 inches in diameter; and the third was on March 24, 1888, when the largest snowflakes were nearly 4 inches in diameter. So far as can be found the 5-inch snowflakes which fell at Nashville, Tennessee, on January 24, 1891, were the largest real Few of the myriad fantastic geometrical shapes which snowflakes assume as they fall from winter skies are shown in these artist's drawings. These flakes may be perfect, single snow crystals; as, for instance, during the beginning of a snowstorm when the air temperatures are well above freezing. More often, however, they are groups of several partly meltéd snow crystals which have come together and adhered to each other during their journey through the clouds. Note that all the patterns are six sided. Being minerals, snow crystals follow the laws of crystallography. 70 Modern Mechanix and

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easter Take a good close look at a snowflake some of these days and you'll be surprised at what you see. Geometrical patterns that no artist could design will greet your eyes. This fasci- nating story will tell you some astounding facts about these snow- flakes—how tbey are formed and how they sometimes attain to gigantic sizes. Maybe you won't believe it, but snow- flakes five inches in diameter, almost as large as a saucer, have actually come down out of the skies. This phenomenal occurrence was recorded at Nashville, Tenn., on January 24, 1891. snowflakes are simply masses of snow formed by the collision and adherence of many small snow crystals. Two or more of these crystals unite near the cloud level, forming a large snowflake which intercepts others as it falls to the ground, gradually becoming larger on its way earthward. Due to air friction, edges curl up causing saucer-like shape. snowflakes which have been authentically recorded up to the present time. Gigantic snowflakes, like those that fell at Chepstow, are simply masses of snow formed by the collision and adherence of many small snow crystals. Two or more small snow crystals unite near the cloud level, forming a snowflake somewhat larger than its neighbors. This snowflake intercepts others as it falls toward the ground, gradually becoming larger and larger on its way down. Due to the friction of the air, which tends to retard the falling motion, the edges of the snowflake often curl up, causing the characteristic saucer, or plate-like, shape. Although the terms “snow crystal” and “snowflake” are often used synonymously, there is a real distinction between the two. Snow crystals are formed when the invisible atmospheric mois- ture condenses during air temperatures below the freezing point. One interesting thing about snow crystals is that they аге always six pointed or six sided. Snow crystals are minerals, just as diamonds are minerals. Consequently, when moisture condenses into snow it follows the laws of crystallography, just as other minerals do. Mineral substances crystallize during the solidification process whenever the molecules are free to move about and arrange themselves according to mathematical laws. In the case of snow this arrangement is always hexagonal or six sided. Anyone who has ever thrown snowballs knows that it is only the damp snow particles that cling together when their surfaces come in contact. Cold, dry snow crystals do not adhere when they collide. Inventions for February Gigantic . ieces of NATURE Here are few more more shapes which flakes assume. These de- signs often provide artists with patterns for dresses, etc. 71

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Artificial Radio SIGNALS N INEXPENSIVE and compact device for training flyers to pilot planes by radio beacon and to effect blind landings has been perfected by Lieutenant Carl J. Crane, Randolph Field, Texas, flying in- Structor and noted authority on blind aerial navigation. Under actual flying conditions the in- vention has proven successful in both Army and civilian tests. By simulating radio beams, the newly perfected device is used to work out al- most any problem in connection with fly- ing by radio beacon or making blind land- ings by means of electrical signals emitted from the airport of destination. Construction of the Instruments Seated in the open cockpit, the flying instructor has before him a panel (about 5x7 inches) upon which are mounted seven switches and three dials. The in- structor and his blind-flying student, who operates the controls of the plane under a sight-tight hood in the other cockpit, are connected by a telephone into which the teacher advises his pupil throughout the course of instruction. Here are two army flyers demonstrating the new blind flying instruments. Student (at left) watches dial shown in inset The only instruments necessary for the student are a set of earphones and a small dial with two pointers, swinging from pivots on the-right side and the bottom, which cross at right angles over the cen- ter of the dial. This indicator is used in training the student in the Department of Commerce method of making blind land- ings. Р How the Device, Operates In this method, a system of energized circles around the center of the airport emits radio signals which move the point- ers of the dial. The vertical pointer, show- ing the course, and the horizontal indi- cator, which points out the “too-high” or *"too-low" position of plane, are both operated by the instructor. *Although blind landings for regular commercial or military planes are still in the experimental stage, it will not be long before all pilots will be able to qualify in the new art, just as they will soon be re- quired to make their mark in flying blind," Lieutenant Crane declared while being in- terviewed by the MODERN MECHANIX AND. INVENTIONS representative. to learn whether he’s -off course. Instructor at right operates control dial (shown below) to show student direction ship is flying with relation to landing field. Instructions are given through the mike—Photos courtesy U. S. Army. Air Corps. 72 Modern Mechanix and

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“Geach Blind Mis INSTRUMENT Y TOO HIGH = =. == (NEEDLE POINTS ERROR): PLANE HEADED FOR CENTER. OF FIELD - NEEDLE AT. ZERO. $ „Бү OFF COURSE. - ТО БЕРТ 5^ ie POINTS ERROR. Radio beacon signals, by which the stu- dent knows whether he is on the course or to the left or right of it, are also simu- lated on the Crane Beacon and Blind- Landing Trainer. When the instructor sees the student is keeping on the predetermined course, he throws the “T” switch which causes a miniature coil operated by a motor to sound a long dash at regular intervals in the pupil's earphones. Should-the student get off the route to the right, the man be- hind the panel in the open cockpit imme- diately sounds the “N” signal (a dash and a dot) until the airplane is headed back Inventions for February — — me. - OFF COURSE | CL TO RIGHT..WEEDLE NT -APPROACHING . E OF CLARITY. Artist's drawing above shows how blind flying instruction instru- ments ate installed in cockpit of plane. Student in front is hood- ed, while instructor sits in rear at control panel. Drawings at left illustrate how dial pointers indi- cate deviation of ship from course leading to landing field. Student steers plane as if needles were being actuated by energized cables from air field. When the instructor sees the student is keeping on tbe predetermined course, he throws switch which causes a long dash to sound in ear phones. Should the novice get off course to the right a dash and dot sounds, to left, a dot and dash, until the ship’s nose is pointed towards the runway. These signals duplicate those heard from airway radio beacons. Lieut. Cari J. Crane, of Randolph Field, 'Texas, is the inventor. oe) GLIDING ANGLE O.K. 2 NEEDLE IN CENTER OR ZERO POSITION in the correct direction. Should the plane assume a position left of the prescribed course, the instructor switches on the *A" signal, a dot and a dash, until the ship's nose is pointed to- ward the “airport.” The three remaining switches on the panel also serve to orien- tate the flyer as he comes in for a blind landing. Lieutenant Crane's invention is expected to be hailed by all airport executives as an ouster of expensive ground equipment and to permit blind flying and landing in- struction at every out-of-the-way Army and civilian airport. 73

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HANDIKINKS When you've got some job on hand to perform look through Handikinks department for a method of carrying it out with greatest ease and minimum labor. You'll be surprised to learn how complex tasks can be simplified. Radiator in Pipe Gets More Heat From Stove AN OLD Ford gas tank or metal drum, rigged out as illustrated in the drawing at the left, will go a long way towards reducing heat bills. First, solder a number of four-inch pipes in criss-cross fashion in the drum, as shown, and then take out a section of the stove pipe and replace it with the drum. Make sure that you do a good soldering job, so that no leaks develop. With this stunt, heat rising through the stovepipe warms the criss-cross pipes, which in turn radiate a warmth into the room. A few braces on the pipe might be necessary.—Bob Poulson.

il Inner Tube Band Helper on One-man Saw T’S QUITE a task to saw down a tree with a one- man saw, owing to the pressure the operator has to exert in holding the saw in the cut. This difficulty can be overcome, however, by making two hooks as illustrated at the right. The larger one, the one with the row of notches, fits over the handle end while the smaller one fits over other end. A rubber band is then cut from an old inner tube and hooks into the notches, as illustrated. When the band is around the tree, the saw will be held firmly in the cut, so that your energy can be applied to the back and forth motion.—A. H. Waychoff. Pair of Skis Makes Runner for High Speed Coaster MORE enjoyment than tobogganing can be de- rived from this simple sled, which is made chiefly from an old pair of skis. The seat of the sled should be a flat board about a foot and a half wide and three quarters of an inch thick. It should be mounted on three posts on each ski, which can be fastened firmly by using long flat- headed screws through the runner. A bar across the front of the skis will help in steering, the operation being much like that of the regular flexible flyer.—Ad Williams. Here's How to Equip Your Electric Train With Simple Lighting S ystem

RUBBER BAND *

STRIP OF SHEET IRON

ANT to equip your electric train with a lighting system? It's an easy job— here's how it’s done. First youll need a gang of Christmas tree lamp sockets. On each end of the cords solder one part of a dress fastener, using one of each kind on each coach. On the rear of the body of the coach, solder another half snap fas- tener. Make sure that a connection to this last mentioned fastener will carry current taken from the rails by the wheels. Now remove the top of the coach and tape the socket in place, hanging it to any conveni- ent cross-member. Bring one end of the cord through the front vestibule and the other through the rear, and replace the top. Then make some sort of a connection 74 to the third rail contact through the en- gine. Finally hook up the entire system as illustrated in the drawing, and you are ready to breeze along. Be sure to wipe the oil from the trucks and scrape the rails to insure a clean con- tact.—John L. Story. тт б пек ра ч Y / О Mo) „ oM. : KO : EG uc NGA Qu ur NO,

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Auto Springs Make Hole Digger N EXCEPTIONALLY staunch, quick cut- ting posthole disger can easily be made from the shortest leaves of old auto springs. Your first job here is to cut from a block of wood about 6 in. square a truncated pyra- mid of the shape shown in the drawing at the right. A slot the width of the springs is then cut off on all sides as shown' by the dotted lines to take the leaves of the auto springs, which have previously had their edges ground down to a sharp cutting edge. Fasten the cutters in place with lag bolts. A handle is made by taking a couple of pieces of %-in. pipe, assembled as illustrated. A pin run through the sides of the block holds the pipe firmly in place. The digger will work in the hardest ground.—Don Banner. SHARPEN EDGES Emergency Work Shop Light From Spark Plug, Bottle SING only a small-necked bottle, an old spark plug and a piece of string, an emergency light for the home, shop or camp can be speedily rigged up to illuminate whatever you feel needs illuminat- ing. Simply take the old spark plug and remove the top screw and the wire which runs through the plug, leaving only the bottom with the porcelain case. This is then placed in the neck of the bottle or inkwell and a cotton string is pushed through the hole where the wire was. The string acts as the wick. Coal D oil is used as fuel. Several of these will give a sur- 4 prisingly good light. It may be used as a candle by plumbers or as an emergency light when the juice goes off. Even for soldering it will prove helpful where small jobs are ҮШ ДШ ЙЕ B tobedone.—A.S. GR x aX gl) m T LS Wurz, Jr. Sift Ashes With Ordinary Garden Rake D? YOU know that you can sift ashes with a garden rake about as easily as can be done with a profes- sional sifter? When you have a sifting job to do, simply spread the ashes out on a concrete floor and then rake them out thin. The fine ash, of course, cannot be raked, whereas the large chunks can be separated out with the greatest ease. The chief advantage of this method is that it is dustless as com- pared with the regular shaker method most com- monly used. In these hard times you might be able to save quite a bit on your coal bill by the application of this stunt.—W. F. Schaphorst. Magnetic Screwdriver for Radio Repair Men T’S THE easiest thing in the world to put a screw or a bolt into an inaccessible spot with this handy electro-magnetic screwdriver. It is made simply by ТАРЕ wines winding on about fifty turns of No. 24 cotton covered TO HANDLE wire in two layers over the shank as illustrated in the drawing at the left. Then connect the end of one wire through a switch made out of two old contact springs from an old plug-in socket. Two ordinary dry cells will furnish sufficient juice to magnetize the > {| shank and hold the bolts or screws in place.—Jas. COTTON COVERED WIRE toparterry McDermott. Inventions for February 15

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CHIMNEY HOT WATER OUTLET Scalding Ice Box Without Danger of Burns THEY repulsive kitchen chore of periodically scald- - ing out a refrigerator is as essential as washing the dishes, lest the interior develop a bad case of "ice box halitosis,” How this task can be performed with great- est ease is depicted in the accompanying drawing. First place а panful of boiling water atop the icebox. Then procure a four-foot length of small rubber tubing and anchor one end of it to the bottom of the pan by slip- ping it through the handle of an inverted teacup. Finally start the siphon working and scald down the walls. With this method it is possible thoroughly to clean every nook and corner. Also, as the hands do not be-- come wet, a much stronger deodorant can be used in the water. А good scrubbrush brought into action will help matters a lot.—David Bacon. making it about % is no danger of spill- ing them all over the floor.—Andrew Vena. IE AS a man about the house, you've ever been called upon to unscrew the top of a fruit jar, you know what a hopeless task the job is. Well, here's what to do about it. Simply lay hands on an old rubber band, preferably one cut from an old inner tube, and wind this band around the lid, as illustrated in the accom- panying drawing. First, however, bang the top lightly on some hard surface. Then grab hold and twist with all your might. The rubber keeps the fingers from slipping, and affords a better grip. It might be advis- able to have а number of bands of various sizes for vari- ous sized jars. It's advisable to have the band fit rather tightly on the metal.—Florence Carlson. 76 Furnace Pipe Heats Water for the Kitchen NSTALL this little water heating contraption in your furnace pipe and your hot water worries will be over for a long time. The only materials needed are a copper coil, a length of brass pipe, and a few connections, all of which may be ob- tained from any dealer in plumbing supplies. The coil is set into the chimney pipe, as illustrated in the drawing at the left. The cold water enters the coil at the bottom, is warmed by the heat coming up through the chimney pipe, and then passes back into the boiler, ready for use. Of course, you must have a support for the boiler, and some good insula- tion for the pipes, but any good mechanic can figure я EH D. that out. The hook-up of the pipes is thẹ same as BI ul FEES that for ordinary boiler installation.—T. Kornylak. Slots in Drawer Sides Prevent Spilling of Contents O MAKE it impossible to pull out a drawer too far, so that there is no danger of a crash to the floor, put this little kink to use. First, cut a long narrow slot in each of the two sides of the drawer, in. wide, with inner edges beveled. A large flat-head wood screw is then driven through this slot and into the side post or frame, so that it is flush with the inside surface. The same is done for the other slot. If you should ever wish to remove the drawer, you can do so by merely taking out the screws. This stunt is especi- ally recommended for drawers which are heavily loaded with tools or other heavy objects. With it there Modern Mechanix and

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Converting Coupe Into Bedroom A automobile coupe may be quickly i converted into a perambulating bedroom. Screws which hold the back cushion in place are removed and the top hinged to the back ‘shelf. The metal base on which the seat rests is removed and in its place is substituted a wooden frame, which is made removable through the aid of dowel pins. By hooking the cushion to the crossbow in the ceiling, and removing the seat, plenty of room is left for a bed. The front seat is moved forward to serve as a pillow, while the mattress is spread out over the rest of the bed.—Everett Folger. ^ SHELF BACK CUSHION OF CUSHION Ш HINGED | POST a WEIGHT .Gate Lowers When You Drive Over It РМУАТЕ road signs are unnecessary when you have this chain strung across the driveway. As illustrated in the accompanying drawing, one end of the chain is hooked to a stationary post, while the other end is hooked to a hinged post, having a weighted outrigger. When you drive over the chain, which should be low enough so that it doesn't catch on any parts of the car, the hinged post tips over and lets you pass. When you're over, the post rights itself and raises the chain, which tells the public that Dash Light Tells When Your Brakes Are On AVE you ever tried to get under way in your auto and found that you couldn't budge? Then suddenly looked down and saw that your emergency brake was on? That nuisance can be prevented by installing this little brake warning. As illustrated in the drawing, it consists simply of two blocks .and a wedge, installed near the brake lever and hooked to it. Contact is made when the wedge is pulled in, that is, when the lever is pulled back. This action turns on the light on the dashboard, thus keeping you informed when your brakes are on. Wire the gadget up as illustrated in the drawing at the right. With this little gadget installed there is no danger you will ever damage your clutches. —Wilkey Zane. , kag J) LIGHT ON разн 5х a BRAKE 7 YN past LAMP! LEVER SIDE CONTACTS E the road is closed.—N. G. Near. M j p Lj ù Ё MOVABLE WEDGE 1 BATTERY = Py ese L7 о ES | Зе Г mi Inventions for February Kill That Spring Squeak With an Oil Spray СОЕТ springs play hob with your nerves when you're cruising along a bumpy road, but the way to remedy the difficulty, needless to say, is to oil the springs. The best way to do this is to get yourself a little spray gun and fill it full of light oil. Then pro- ceed. to spray the springs thoroughly in the manner demonstrated. by the gentleman in the accompanying drawing. A few saturations like- this and you'll have a silent riding car.—Dale Dawson. 77

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BROOM HANDLE ^w, Induction Coil foi Experimenters N OLD Ford spark coil will make a very satisfactory induction coil for experi- mental purposes. Nail together a wooden box to house the spark coil snugly as shown in the diagram below. ` Next, solder insulated wires, as illustrat- ed, to the spark coil to provide connections : to be fastened inside the box to the binding posts. Use radio binding posts for the pri- mary connections. Select two large brass binding posts to hold the-sparking rods. The sparking rods also should be brass. Suitable material can be purchased at a well stocked hardware store for a few cents. Use a rod having a diameter of approx- imately one eighth of an inch. Redrill the holes in the two binding posts if the holes 0 not large enough to accommodate the rods. Two dry cells connected in series with the primary connections on the box will operate the coil very satisfactorily, or it may be operated from a toy train trans- former.—George Smith. PRIMARY TO CONNECTIONS _ CONNECTIONS FOR SPARKING RODS BATTERY FOR PRIMARY Qu d BINDING POSTS | SPARKING RODS. CONNECTED TO SPARK СОП. Ice Canoeing Is New Winter Sport FLEET of these ice canoes racing down a clear stretch will bring more cheers from a crowd of spectators than a football game. The bodies of the canoes are strong boards eighteen inches wide, with two pairs of skates bolted to the bottom as illus- trated in the accompanying drawing. The pike poles are made from suitably long broom handles, in which are driven long spikes. These spikes are dug into the ice to push the canoe along at a rapid pace. Two strong lads can propel one of these craft along at a good pace.—L. B. Robbins. Play the 100-yard Magnet Dash HANDLE HERE is a chance to try your skill at a new and novel game. It can be plenty of fun due to the trickiness of the magnet and the unpracticed skill of the players. The roller is made by taking two wide flanged spools and driving a plug of cork or wood through the center of each. Then drill the plugs with a small hole in their exact centers. The spools are finally con- nected by a shaft of steel wire about 6 inch- es long. Now take a large horseshoe magnet and clamp it to a long wooden handle as shown. Saw a slot up the center of one end of the stick, insert the shoulder of the magnet and then clamp it tight by two small bolts. A pair of magnets and spools should be thus prepared for a contest. Measure off a distance 100 inches long on a level table or smooth floor and place the rollers at the starting line. Then each play- er brings his magnet close to the steel shaft until his spool moves towards it. The one who draws his roller to the finish line with- out the shaft sticking to the magnet wins the race. A little practice will teach you the trick of keeping the magnet just a jump ahead of the spools.—Thornton Hallett. Modern Mechanix and

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Simple Stunt to Save a Cracked Saw Blade FTEN after a circular saw has been used consider- ably, a small erack will start near the outer edge. If not arrested at once, the crack will travel to the hub and the blade will be ruined. However, if discovered before it has progressed too far, it can be effectively stopped by drilling a %-in hole a fraction beyond the end as shown in the illustration at the right. Although it may seem that there is a possibility of accident re- sulting from this practice, it is recommended by well known saw manufacturers.—Robert L. Dumas. Heavy Timbers Shifted Easily on This Sawhorse N WORKING with timbers, especially the larger size, much trouble is experienced in moving the work one way or tbe other. To overcome this trouble build yourself the sawhorse shown in the accompanying drawing. Їп the top of the sawhorse two notches some two inches deep aye sawed, and in these notches a small groove is cut in each end. Hardwood rollers are then set in the notches so that they come about a quar- ter of an inch above the top of the sawhorse. When working with heavy timbers and it is necessary to move them endwise, the rollers do their duty with perfect ease.—George Daulberg. Old Tube Base Makes Plug for Electrical Experiments N OLD radio tube base of the four, five and six-prong type, to- gether with an empty thread spool, will make a highly service- able plug for electrical experimenters. Referring to the drawing at the right, it will be noticed that the plug is of very simple construc- tion. The spool, which is sawed in half, is trimmed to fit into the tube base tightly, and held firmly in place with small steel pins. These pins are made of small nails. Before the spool is put into the base, each wire's bared end may be pushed into the pronss and soldered in. The cable to the instruments is led out through the hole in the spool as illustrated.— Howard Chandler. | Serviceable Gluing Clamps From Two Wrenches f ĄSTURDY pair of clamps for a multitude of shop jobs can be made from two old monkey wrenches, obtainable for two bits or less at any hardware store. The thumbscrew pin is removed and remounted on a length of steel rod as indicated. If you have the tool equipment for cutting a keyway, it is advisable to key the rod to the thumbscrew. Any sort of handle will do for the end rod, providing it is keyed or pinned to the rod. The supporting guide for the rod may be fashioned from any kind of sheet steel, and is fastened to the handle of the wrench with a stove bolt. The contrivance will prove ideal for wood gluing jobs. —John E. Hogg. HOLES FOR STILL PINS FASTEN is BENCH VISE A ADJUSTING HANDLE’ Wire Brush on Emery Wheel Prevents Clogging RINDING soft metals such as lead, babbitt, alumi- num, etc., often results in a clogging of the pores of the emery wheel. These pores can be cleaned out easily, however, if you will equip your machine with a stiff wire brush as illustrated in the drawing at the right. The brush should be fastened to a piece of strap iron, which is fastened to one of the base bolts of the grinder head as shown.—Daniel tone. Inventions for February 79

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SBUILD d Here's the way the 15 Ford touring car looks when finally com- pleted. The fenders are missing and the whole job has been lowered. RA RAS s PO S E ENT з d mU A С РЕ SE DUO о Е = uem pue Pes p NA ike Ke The top five leaves of the front spring are removed, and inverted. They are placed on the bottom of the spring pile. This lowers the car forward (leveling with rear axle) furnishing a stout shock absorber so that— N ATTRACTION that is sure fire always makes a good advertising medium. This converted Model T Ford, or Comedy Ford, can be very easily built, and is a profit maker for any man who has a little ingenu- ity in selling its uses. It can be used to carry labels, or to give thrilling joy rides about town, or to provide a freak set of thrills on any country fair race track. ' By this conversion the cénter of gravity of the car is brought so near the rear axle that with two men in the little buggy it can be made to run for quite long stretches on the two rear wheels. Sudden starting makes the front end rear up and act jack-rabbity. 80 COMEDY Good money can be made at carnivals and in advertising stunts for local merchants with a sawed off bug made from Model T Ford parts. This article de- scribes the changes that are necessary for mak- ing the entire conver- sion, ready for use. when the car is suddenly started and the front end rears up the lowered and inverted forward spring leaves act.as à strong absorber for drinking up the dropping shocks. The size and odd appearance of the car make it the center of attraction, and really difficult problems in parking are so amaz- ingly easy that much comedy is given to all onlookers. Like Charlie Chaplin, the car is funny just to look at. The elements from which this car is made are simple. You'll need one usable Model T Ford touring in running condition. Remove the body and cut it in two with tin snips right behind the front seat. That is step number one. Next, remove the rear wheel assembly, axle and all, and discard the spring and shackles. Then move the axle forward, and weld in a short piece of drive shaft in place of the long one just discarded, seeing that the end of the universal housing and the bearing on the axle are as close together as it is possible to get them. i Modern Mechanix and

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CHORD A> Pillow blocks of 2” by 4” stock are placed between the frame and the axle on both sides of the frame, and long U bolts of !5" cold rolled steel are bent and threaded and a clip plate fashioned so that the axle may be bolted to the frame. Then the frame is hack sawn off right “abaft” the hold down bolt holes for the body. The radius rods are separated and the ends welded to the sides of the frames. That completes the rear end. с The front end is very simple, needing but few changes. The main idea is to get the whole frame lowered so that it is more on line with the springless rear wheels. Since the rear wheels are now carrying more of the load than the front, the spring forward can be much less strong and still be plenty heavy. The first five top leaves are removed and inverted, and then placed in the bottom of the spring pile. Thus when the car smacks down to earth after one of its spec- tacular “rarin’s,” this inverted spring cush- ions the shock. The exhaust is led out through an ex- tension of flexible metal hose. The body is put on, and bolted down. The matter of marketing the services of the car is not difficult. The photo above shows the muffler tucked in at right A call to local merchants will soon show angles, U bolts over rear axle, and sawed off frame. you what they are willing to pay for a Е И = 28 sign of a comic nature on your саг, and by & 2 changing the car's literary cargo each week, you will keep the turnover steady. A matter of giving “jitney” rides is a sim- ple affair in most cities. Put a sign on the car, 5c a ride, and show it doing some of its bucking tricks. Several doliars a day can be.earned in an active, well populated com- munity. County fair concessions can be ascer- tained by writing the state bureau at your state capital, through the secretary of state. The center of gravity is so near the axle that when car suddenly starts the front end goes jack-rabbity. Above is shown the way the rear axle is moved up against the universal joint on the motor and how the radius rods are led forward to the frame. Left, how pillow blocks and U bolts fasten the axle to the frame. No rear springs are used. Flexible metal hose is used for exhaust pipe. Radius rods are welded to the frame alongside the motor. The body is bolted back.on the frame. The floorboards and all present equipment will fit the altered job. Showing dropped front end with spring pile reversed, U bolts holding axle to frame, and exhaust. Inventions for February 81

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Bring “Ghosts” to Your Home CONICAL TUBE MADE OF HEAVY PAPER DIAPHRAGM — $ TOY BALLOON RUBBER HELD E E EMO Ys моор Disc | WITH Ma" — Construction of gun which shoots invisible, clammy rings of ice-cold carbon dioxide gas, which feel like ghostly hands. HEN Eddie called me up from the "Times" office, and asked me to come along to Madame Y's “Wednesday night circle," of course I accepted the invitation. For over fifteen years Гуе been spook hunting, but with no material success. When spooks have rattled tin cans in a cabinet in imitation of a “Model T," Гуе always found that the spooks had bone and muscle. When nebulous images have ap- peared on photographic plates, I have always found.the foggy patches due to ex- posure to X-rays, radio-active salts, or maybe to a tiny pin-hole in the bellows of the camera. Eddie is a reporter on the “Times.” Nosing around for copy, he had visited 82 The author demonstrating how tbe gas rings travel. Incom- bustible carbon dioxide is here extinguishing candle flames. by RICHARD COKE The author's adventures as a "ghost detective," ferreting out the secrets of fraudulent mediums, led him to the discovery of the ingenious methods of creating phantoms which Һе describes in this article. Using these simple stunts, much fun can be had at house parties, and you can easily convince your guests that you ate in private communication with the supernatural. Madame Y’s the week before. What he had seen had him absolutely mystified, so he got in touch with me to see if I could dope it out. He declared that ghosts were all over the semi-lighted room; actually brushed against him, enfolded him! We arrived at Madame Y’s. It was a big, gloomy, frame house out on Santa Monica boulevard. It was a few doors from a cemetery. I couldn’t help but think that “Madame” was a good business woman: she kept her ghosts close at hand to avoid cross- town taxi fares. At the door we encountered the usual “spirit seance" atmosphere — a dark- Modern Mechanix and

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for WINTER “PARTIES Above, a gas ring mortar of the ` type used by the fake medium. Layout of Madame Y's seance chamber is shown at right; chaf- ing dish dispenses vapor which supplies humidity to make visible the cold gas rings sent into room by confederate upstairs. Geo- metric patterns camouflage open- ings in ceiling. skinned, loose-robed confederate, who admit- ted us and ushered- us into a big room decorat- ed after the motif of grandma’s crazy quilts. The ceiling met the walls in a sweeping curve. Both were paint- ed, in a variety of sizes, with the three most common geometric fig- ures: circles, triangles, and squares. A fairly wide table about ten feet Jong, and covered with a green cloth, was located in the middle of the room. There were six straight-backed chairs at each side of the table, and two at one end. At the other end, on a Slightly raised platform, was an armchair—the “Madame’s.” I noted partic- ularly that the chairs, and all the woodwork about the room, were finished in dull green ‘and offered no reflecting surface. The lighting effect was very unusual. Above the table, and about two-thirds the way between the floor and the ceiling, was a long, green, neon light tube. A semi-cir- cular shield above the tube cut off all the upward beams of light, but diffused the lower part of the room with a sickly, green glow. Before the actual “seance” started, several floor lamps about the room were alight with conventional white bulbs. On a small table in a corner near the “Madame’s” chair, was what appeared to be a re-designed electric chafing-dish—I noted an electric cord leading to the device. It was emitting a spicy-smelling vapor. The Inventions for February Demonstrating how the gas ring mortar sends a halo of dry ice generated gas settling over the shoulders of subject. atmosphere in the room was very humid, oppressive. So much for the physical surroundings. There were about ten persons in the room, mostly women. Also two half-baked- looking males. (Not including Ed and me). Suddenly an awed silence. “Madame” swept into the room with ill-cultivated grace, and wedged her portly form into the armchair at the head of the table. The "circle" was called to order. The word *circle" struck me kinda funny. Why not call the meetings the “Wednesday night rectangle?" After we all were seated, “Madame” went through a lot of superfluous palaver, lead- 93

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Shoe Box Makes a Smoke Ring Generator; Unseen Rings Made Visible Above, large gas ring gun contain- ing hydrogen sulphide gas shot against curtain saturated with solu- tion of carbonate of lead produces red-brown circles on cloth, though path of gas is invisible. Right— smoke rings from a shoe box. Two- inch hole is cut in lid, tobacco smoke blown into box, and tapping the cover produces perfect rings. ing up to the sacrilegious suggestion that we bow our heads and ask the Holy Ghost to give us this night manifestations of con- tact between the quick and the dead. Then she asked who wished the first “manifestation.” Eddie chirped up. He wanted “contact” with his first wife. Ed’s never been married. The “Madame” pro- ceeded to induce “Mabel’s” ghost to pay him a visit. Ed was told to concentrate his thoughts on “Mabet” while the rest of us were told to focus our eyes on his forehead, and center our thoughts upon the materiali- zation of poor Eddie’s departed mate. A tense, strained silence! No one seemed .even to breathe. Suddenly I blinked my eyes. What was that filmy something emerging from the curtain of darkness above? A nebulous halo! Writhing, gently rolling, it settled down on Eddie’s head. It flowed down about his head and shoul- ders. Was it material substance ... or what? Ed knew the moment of contact. I saw him shudder and catch his breath. - And his face paled. The filmy “ghost” en- folded his body. Then it dispersed into nothingness. During the demonstration “Madame” sat rigidly with eyes closed. Now she opened them. She brushed her hand across her brow. It came away damp. She, too, was perspiring freely. “Did you receive the contact?" she asked. Ed nodded and “Madame” smiled triumph- antly. “Who will be next?” she asked. I . volunteered. The same old rigamarole. I sat poised waiting for the ghost of my grandmother who had raised me from infancy. The fact of the matter is that my grandmother died long before I was born. 84 I kept looking at Eddie, across the table from me. By watching his eyes I could tell when the “ghost” was coming. Suddenly I saw his eyes focus to a point above my head. I knew “grandma” was descending. The “ghost” came down! Feel it? PU say so. Like a draught when an ice-house door is opened. The perspiration on my forehead felt like sleet pellets. As the foggy substance settled down over my face, a haze came before my eyes. I sniffed, but could smell nothing. But my lungs tingled, and there was a slight acid taste in my mouth. I lowered my eyes and watched the “shost” slip off my lap and dissipate in filmy streamers. Then “grandma” vanished entirely. s The next volunteer for a “manifestation” was an over-rouged, dreamy-eyed woman seated at the end of the table opposite *Madame." She wished a visitation from the spirit of her dear, departed husband. *He" came down. But they must have boot- leg gin even in spook-land. His spirit didn't setile down nicely over her head. It came down at an angle and brushed against her bare arm. At the contact the woman let out a squeal and threw a faint—a synthetic one, I believed. 3 “Madame” clapped her hands. The dark- face, turban-headed butler rushed in. “The doors! The windows! Give us air! Fetch the smelling salts." He did her bidding. Blasts of welcome fresh air entered the room. “Madame” unwedged herself from the chair and moved to the stricken woman. On the way I saw her switch off the electric chafing-dish! The woman came out of her swoon. The seance was resumed. (Continued on page 138) Modern Mechanix and

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Chimney Draft “Winds Automatic Clock CLOCK PROPELLER WO RKS HOOD ыо BOLT а i, PIPE FLANGE М EDGE DROPPED FOR DRAFT OPENING The drawings above give construction details for the self-winding alarm clock that fits in chimney flue. of parts is shown in the illustration in upper left corner. TEE best of clocks will stop running if not wound at certain intervals. The incon- venience connected with this fact may be easily overcome by rigging up the self- winding clock described here. After determining the alarm clock you wish to use, hold the key in winding posi- tion so it does not touch the catch which keeps it from unwinding. If the clock still runs, you will have the better of two types possible to use. Should it stop, however, it is necessary to remove the spring and dog which keep it wound. Taking for granted you have the first type, the next step is to secure an old alarm clock no longer useful. From this, remove the pendulum, balance wheel, hair spring and all the alarm gears as none of these are used. Take the little gear that operates next to the pendulum and braze a piece of steel wire to the end of the shaft opposite the winding side. This serves as the pro- peller shaft and should be about 8 inches long. Next remove the time gear spring ` and fasten securely to the propeller gear so that it will not turn within itself, The Second Type Alarm Clock If you have the second type of clock, this performance is reversed. Leave the spring in the clock works that you are using for the train of gearing and remove the spring in the clock you are using for time. Make the shaft and gear of the latter secure so that it will not turn within itself. j Returning to the other type of winding clock, put the train of gearing together in its frame. Test it from the propeller shaft Inventions for February © 4 — OPENING PROPELLER BEARING cSTERLWI : we shart 67 LONG PROPELLER 2 234” ~s PENDULUM GEAR DIAMETER BRAZED TO PROPELLER HAFT Assembly Pointed arrows indicate path of draft. to see that it works smoothly. The next step is to place the two winding posts end to end, fastening them together with any ordinary radio wire coupler that has set screws. Drill the opening in this coupler to fit the respective winding posts. When this is accomplished, fasten the frame of ins train of gearing to the clock used for ime. When shaping the funnel hood, allow for flaps to bolt to pipe flange and clock. Also, a drop in the lower edge to permit the draft, that turns the propeller, to enter. Arrange a sliding shut-off in this opening with which to regulate the amount of draft. Anti-Smear Stunt for Draftsmen RAFTSMEN know how disheartening it is to get a drawing finished neatly then suddenly ruin it with a swipe of a T-square on the edge of which a bit of ink has col- lected from the ruling pen. The way to prevent these disasters is to attach to the end of the T-square a spring brass clip as illustrated in the drawing’ at the right. 'This will hold the edge up off the paper and prevent smearing. The clip may be easily re- moved when the T-square is not in use.

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HELPFUL JDEAS for the Non-frosting Windows With winter upon us, the seasonal neces- sity of enduring frosted windows or those which steam up when cooking is done is with us again. This annoyance can easily be done away with by purchasing twenty- five cents’ worth of glycerine from your drug store. Apply this to the glass with a rag. The thin coating it leaves offers no surface for moisture to accumulate upon. Drying Shoes With Light Bulb Wet shoes should be dried from the in- side rather than by baking in a hot oven, which always results in such damage to the leather that its useful life is cut short, though the owner may not be aware of it. A ten-watt electric light bulb placed direct- ly inside the shoe, as shown above, makes an excellent drying medium. Higher pow- ered bulbs should not be employed, for they dry out the leather too quickly, with dele- terious results. 86 Repairing the Gas Range Cleaning gas burners generally restores the efficiency of the kitchen range. The burners should be removed, carefully brushed and scraped, and darning needles run through each small aperture. Then the burners should be boiled in sal soda. They should be carefully dried by heating before returning to place. | If the pilot light on your gas range gives continual trouble, cut a hole about three- quarters of an inch across in the top of the cap which covers the pilot. If you suspect a gas leak in the house lines, make sure that all gas cocks are turned off, then watch your gas meter. If any of its hands move, begin looking for the leak. Removing Glass Stoppers This method of removing stuck glass stoppers from bottles is one of the most efficient known. А heavy copper wire is wound around the bottle at the point of the stopper, and a long end left to dangle in a gas flame. Heat will flow along the wire and expand the bottle neck so that the glass stopper falls out easily. c Easy Thermometer Repair Through mishandling, the mercury col- umn of a thermometer sometimes becomes separated. By heating the stem of the ther- mometer gently over a subdued gas flame, and striking the instrument end-on against the palm of the hand, the broken column can usually be reunited. Modern Mechanix and

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HOME GIX-IT AWA For Frozen Pipes If you have a water pipe that freezes in extremely cold weather, try covering it with felt, asbestos, or cork; then allow a small stream of water to trickle from a faucet near the danger section, to keep up movement in the pipe. If pipes are found frozen, prepare to shut off water pressure if a fracture is discov- ered. Then warm the pipes from the faucet end with a small blowtorch or other heating element. Heat applied should be gentle and should not be concentrated on one section of the pipe, but moved gently back and forth. Burlap sacking wound around the pipe and saturated with hot water is effec- tive. Sometimes a candle gives sufficient heat. Be careful not to set fire to adjacent woodwork. Plaster Repair Kinks Broken plastering is one of the most common ailments of the interior finish of the home. The upper section of the above photo shows a crack in a tiled wall along the edge of a bath tub. The lower section shows the same spot repaired with a filling of plastic wood, which was smoothed into the opening, permitted to harden, and then coated over with a layer of enamel to match the wall. Because it is already mixed plas- tic wood affords a quicker repair to such breaks than regular plaster. Every home has various accessories mounted to the walls by screws, which frequently pull out, leaving a ragged hole in the plaster. Plastic wood can be used to fill up this hole, leaving a solid base into which the screw may be forced, or a wood- en plug can be driven in and screw reset. Inventions for February Vegetables Preserve Flowers An old method practiced in New England for the preservation of cut flowers is to mount them.in a good-sized fresh potato, cucumber, beet, or other solid vegetable. A sharp lead pencil or pointed instrument is used to punch one hole in the vegetable for each flower stem, which is inserted therein. The whole is then set in a vase with water sufficiently deep to cover the base of the stems. It is said that flowers will keep twice as long as usual when this method is employed. Preventing Short Circuits When the little strands of wire inside an electric plug work loose they often come in contact with the other side of the circuit and produce short circuits. This may be prevented by filling such plugs with melted sealing wax, sulphur, or just plain house- hold paraffin. Tar or pitch will also serve equally well, and once set in place afford sure insurance against short circuits and possible fires. The melted material used should be fairly hot so it will flow freely into all of the interstices. 87

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Cut Your COAL Bills With Here is the ventilating fan in position beside the cold air duct and ready : 'The prop is supported by three iron bars which rest on the ed from the air by the pads. edge of the pipe. Make the holes for the belt as small as possible. for action. OU'D be surprised to learn how wasteful the average furnace is. Because the air tends to stagnate in the pipes, there is a lot of heat expended for other purposes than warming the air. Here's a simple little stunt, however, that will go a long way toward substantially improving the efficiency of your home heat- ing system. The contrivance can easily be rigged up in any home workshop and applied to the furnace in a few minutes. Fan Keeps Air Circulating The function it serves is that of keeping the air in circulation in the pipes and hence in the rooms. Every possible calory of heat is utilized, making for a great saving in the coal bills, perhaps a ton or more a season. And a ton is easily worth saving in these times. The initial outlay will run you slightly more than the price of a ton of coal, but when next winter rolls around again you will be able to put the money-saving device into operation without any cost whatever. - In addition to all this, however, a great benefit will accrue in the form of health 88 These air filter pads, inserted in the outlet pipes in the various rooms, will go a long way towards bettering health and cutting down cleaning costs for draperies and. curtains. The fine spun glass removes all the fine particles in the air. betterment. This is made pos- sible by the employment of special filter pads which have recently been put on the market. Made of fine spun glass, as illus- trated in the photo at the top of the page, these pads filter out all dust and other dangerous par- ticles which would otherwise be sucked up into human lungs. Not only that, but a great sav- ing in the cost of drapes, cur- tains, etc., is made possible, since most of the dust is extract- Now let’s get down to the А actual construction of the con- traption. First on the agenda comes the fan, which is really the heart of the ven- tilating system. The hub should be made from a block of hard wood—any kind you have available. On two sides as illustrated in an accompanying drawing, cut a groove of the dimensions given. This is to take the fan blades. Use Hard Wood for Blades These blades may be made from any hard wood, three ply veneer being quite all right for the job. They should be cut to about the shape given in the accompanying photo. Form the blades so that the widest portion is at the bottom, with a tapering form running towards the tip. The length of the blades should be such that the diam- eter of the entire prop is about an inch less than the diameter of the pipe into which it is inserted. The blades are secured to the hub by first smearing the groove with glue, then inserting the butt of the blade and clinch- ing the bargain with a couple of finishing nails, Of course, the blades are to be set at opposite angles. Modern Mechanix and

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CFURNACE The fan blades are shaped as illustrated in the photo above. The butt end is glued and nailed into the grooves in the hub block. At right is seen how the pulley to take the shaft is secured to the hub block. A set screw holds the shaft firm, to prevent play and wobbling. The completed propeller is secured to the shaft upon which it revolves in the manner illustrated in the accompanying drawing. It will first be necessary to bore a hole in the hub to.take a short section of the shaft. Then to the hub is screwed a pulley having a collar and set screw. Make all these parts firm, since they have to stand a lot of wear and tear. This entire element of the ventilating system rotates in a bearing made from the head stock of an old lathe, which may be procured at any 5-10-25 cent store. Or if you can’t procure it there, write to Modern Mechanix and Inventions editors, and they will be glad to give you purchasing data. Two iron bars, secured to the bottom of the headstock, as illustrated in the draw- ing at the top of the page, serve as supports for the bearing. The ends of these bars rest in the metal on the periphery of the cold air duct, this latter part being wrapped with asbestos cloth to prevent air leakage. Now for the power plant. This consists of a quarter, sixth, or eighth horse motor mounted in the position illustrated on the opposite page. It should be provided with as firm a base as possible, but any good Inventions for February ‘Ventilating Fan All parts of the ventilating system are seen here. The shaft for the fan revolves in a bearing made from lathe headstock. HOLE FOR SHAFT

SET SCREW electrician knows that. The two pulleys on the motor and the fan blade respectively have a ratio of approximately 1 to 4. You may have to vary this by experimentation. See that the hole through which the motor pulley passes is as small and as air- tight as possible. Current consumption of the motor is small, so that there will be no substantial addition to your electric bill each month. Simple Cure for Leaky Valves Some radiator valves have an irritating way of dripping, dripping, dripping, with the result that a good carpet is sometimes ruined. Remedy this nuisance by covering the valve with.a sponge which has been hollowed out to fit over the - metal. The water then soaks into the sponge and evapo- rates, act- ing as a hu- midifier.

E SPONGE < | OVE! VRADIATOR VALVE

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"Rubber Bands “DRIVE ‘Ghis 2 RATCHET CLIPS FROM о M ( \ OLD PHONOGRAPH SPRING |) d ( \ \\ \ (0 FREE WHEELING ASSEMBLY Fig. 1. Here’s how the free wheeling system on the rubber band-“motor” works. Note that the ratchet clips engage the notches in the wheel. Most of run is spent free wheeling. Be there the boy with soul so dead, Who to himself has never said: “Gee, I wish І had a baby auto." HIS article will make those wishes come : true. Here is a nifty looking baby with ‘clutch, two forward speeds and reverse, and Free Wheeling. The design is simple; the materials are cheap; which brings the building of this miniature car within the scope of the average mechanically minded boy’s pocket book. It is powered with rubber band motors! 90 DICK COLE The completed rubber band powered motor ready for a three-mile spin-—from a single winding of the rubber band "motor." Headlights, horn, etc., add to attractiveness of car. Here’s something distinctly new in the way of midget autos. Powered by a bat- tery of rubber bands from old inner. tubes, it will cover a distance of three miles at a surprising clip—and on one winding. Seated at the wheel you'll be the envy of all the youngsters in town. Now don't let skepticism enter your mind until you have listened to reason. To show the reader how much power can be stored up in the rubber band “motor” of the baby car, I shall illustrate. Suppose you looped three, heavy-duty, inner tubes of good, live rubber over a solid post, and looped the other ends around the bum- ‘per of a light car. Now start the car. The tubes will stretch out about five times their original length and will actually stall the car in low gear. Now think of the potential energy pos- sessed by those stretched tubes! Think how high they could hurl a rock if made into a giant catapult! 'That is the potential power stored in the rubber band motor—only more. When the Modern Mechanix and

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eMidget cAuto «ohree е?еѕ amount of rubber contained in three inner tubes is cut into narrow strips, the rubber has a greater elastic limit. The purpose of . the rubber band motor is to conserve all the available power and deliver it to the wheels of the car in an even flow. The plan and side view in Figs. 9 and 8 respectively, are not offered to familiarize the builder with the general working prin- eiples of the baby car. Here we see the sixteen rubber band motors which contrib- ute their twisting torque through a irain of small gears to a common master gear. This, in turn, operates the pinion gear shaft which communicates the power to a cross- shaft, thence by belt drive to the wheels. SHEET METAL PIECE RIVETED IN SLOT IN SHAFT— Au. A e = Vg Ab H БЕЛЛЕ | 19" > PITCH 20 - 0.14" FACE 3g'- HOLE 9g'- WITH: HUB: sembly, seen in Fig. 3 at left, is built between two cross members at center section of PITCH J2— RD. 2/5" FACE 54'— HOLE l2". WITH HUB: (3 USED) PITCH: 20 - РО. 216" FACE l/5"— HOLE 1a" (ONE USED) %" X 4" CARRIAGE BOLTS The forward drive is through the right rear wheel only, and two round leather belts running over V pulleys of different sizes provide two speed ratios. Normally the belts are free on the pulleys, but an idler pulley can be brought to bear against either beli. The contact surface of the V ulleys is highly polished so that very little riction is contributed by the slack belt. The driven pulley floats freely on the back axle, and is fitted with a simple side ratchet device which engages the wheel itself. This provides free wheeling when the rubber band motor is stopped. This is done by pressing the left pedal. This action snubs a turn of sash-cord in a grooved pulley on the cross drive-shaft. See Fig. 9. Brakes are provided by passing a loop of sash-cord around a grooved pulley bolted to the side of each wheel, and lead- ing the cord to the right pedal. : Each rubber band unit of the motor passes through a hole in the end cross rail CROSS DRIVE SHAFT. BRACKET Fig.2. (Above) Underside view of chassis shows "motor" wound up ready to de- liver its power to the gears. Motor as- frame. Power is delivered. from the rubber bands to the wheels through the Boston stock gears. Front view of the car is seen at top left. Inventions for February 91

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Frame Must Be Strong to Stand Twisting Torque of Rubber Band Motor SEE DETAIL OF р MOTOR PRIEMET S Fr SEE SPRING DETAIL —— —5»- DT Fig. 4. Elements of chassis are seen here. Birds-eye maple is recommend- . ed, with parts glued and nailed, then reinforced with angle plates. Note manner of springing front and rear wheels, Front ends of rubber bands are held in the holes bored along the front and rear ends of the chassis. of the frame and is fastened to a special clip (Fig. 10). This permits the bands to be stretched while winding, which adds great- ly to the capacity of the motor. Fig. 4 shows the frame of the baby auto. Let it be understood that this must be strong and rigid to resist the twisting torque and pull of the sixteen rubber band motor. It is well to tightly mortise, glue and screw all joints, and, as an extra precaution, cap the joints with angle plates. The middle rails support the transmission unit of the Озун. this is covered in a special detail ig. 3). Front Axle Fig. 6 covers all the details of the front axle and the steering spindles. Carefully selected wood should be used, and an es- pecially hard, knotty piece for the steering spindles. Birds-eye maple is recommended. The sheet metal plates around the ends of the axle should be secured in place be- fore cutting the notch to receive the steering spindle (See Fig. 6). The cutting can be done on a jig-saw with a metal cutting blade. The size of the wheel axles depends upon the size of the hole in the wheels used. An old brake-rod with yokes, from an auto wrecking yard, will provide the tie- rods in conjunction with arms made of 5/16" eyebolts. The steering wheel hook-up is shown in a later detail. The spring sus- Fig. 5. Y. t 1 idea as to how the rubber М i i e secured. Lat {теше Тора this photo. Observe DeNSiON method of the front axle is better also pulleys on rear wheels for braking and transmission. understood by consulting Fig. 4. 92 Modern Mechanix and

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Power Is Delivered to Rear Wheels STEERING SPINDLE TURNED FROM VERY HARD MAPLE — STUB AXLE SCREWED INTO WOOD AND LOCKED WHATEVER | ‘size FITS E oi SHEET STEEL WHEEL > ire AROUND ENDS BEARING |! |» OF AXLE > i 4 ` x FRONT AXLE- om O eS e ———————— ot "ELO, ] HARDWOOD | 44 BRAKE ROD YOKES FROM JUNKED AUTO TAPPED fig 0:5.5.— USE „LARD ОШ i 195 AXLE BOLTED RIGIDLY TO SPRINGS —ALL WHEELS AND PULLEYS TURN FREELY ON AXLE IP SNUBBERS ARE LOOPS OF | FLEXIBLE CABLE 5% - 3 o г ay PES. - FREE / WHEELING {= z^ BRAKE 9 HIGH GEAR LOW GEAR In Fig. 6 we have the rear axle, drive pulleys, free-wheeling and the spring sus- pension of the midget car. The notations attached to the drawings should make everything obvious. Here we see how four discarded valve springs add support to the otherwise rather flimsy springs. The simplicity of the free-wheeling is shown in Fig. 1 and needs no explanation. It is the free wheeling feature which gives the baby auto its wide range of travel. A few impulse turns of the motor, then free- wheel, and so on. By this economical means the car has a travel range of over three miles on one winding of the motor. The sketch shows 12” rubber-tired coast- er wagon or scooter wheels used. These Inventions for February BRAKE PULLEY ONLY 1S BOLTED TO WHEEL И Through Belts Over Idler Pulleys Fig. 7. You will find it easy to cut out the front axle on the auto with a band-saw. The ends are strengthened with sheet steel which also serves to hold the steering spindle as illustrated in the drawings at left. LEFT SIDE DRIVE PULLEY BRAKE PULLEY Y 60* ; Me CM ^ "ni RIGHT SIDE DRIVE PULLEY Fig. 6. These drawings wii give you clear idea as to the construction of the frent wheels. You will see that some of the pulleys are grooved V-shaped, while others are round. Follow the plans carefully. Toy auto wheels should be used. IDLER PULLEYS can be obtained from a hardware jobber dealing in toys, etc. They may have to be ordered special and cost about $3.50 a set of four. In Fig. 3 we have the vital unit of the baby car—the power and transmission as- sembly. While this may seem rather com- plicated at first look, it is really very simple. Stock gears are used throughout, and can be bought cheaply from manufacturer’s distributors throughout the country. If you have difficulty obtaining the gears, Modern Mechanix will inform you of your nearest agent. Of course all the holes must be laid out carefully, and, for safety, it is best to allow about .005” more than the regular pitch 93

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Horn, Headlights and Bumper May Be Added to Make Car Businesslike Fig. 8. Ready for covering. Note positions of clutch and brake pedals in front and control lever at side. SPRING LOCKS MOTOR WHEN FOOT 15 OFF CLUTCH PEDAL iM | А 4 CLUTCH PEDAL WORKS FREE ON „т E REVERSE IDLER LEVER | : 3H | "i Fig. 9. Assemble the parts for the car as illustrated in this drawing. Give particular attention to idler lever and pulley. 94, Modern Mechanix and

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Sufficient Power May Be Stored їп Rubber Bands to Run Car 3 Miles SASH-CORD AROUND PULLEY LOCKS MOTORS — CAR ӯ ES FREE WHEELS RUBBER BANDS STRETCHED ABOUT 3 TIMES THEIR. ORIGINAL LENGTH FOR WINDING a= & (= нн GEAR PULLEY C— LOW GEAR PULLEY FORWARD DRIVE BY RIGHT WHEEL ONLY Fig. 10. All the motor and control elements are to be found in this draw- ing. Note particularly the reverse and forward con- trol lever. Right—Special winding device for bands. Above—Fig. 11. Wind up “motor” as illustrated here. Spe- ciat crank disengages the rubber band, twists it, then slips it back into slot. Be sure to wind all bands in same direction. Left—Fig. 12. Back view gives good idea as to how pulleys ate arranged on rear wheels for braking and power trans- mission, Rubber bands are all wound up for 3-mile spin. diameter to prevent the possibility of any binding. All the gears are “with hubs,” and it is better to pin them to the shafts than to trust to set screws only. The location of the motor brake pulley— or clutch pulley—is shown. It can readily be understood how a length of sash-cord can be led to the clutch pedal, and how it will snub the pulley when the pedal is depressed. : Fig. 9 gives the layout of all the pulleys. Selected white maple will serve for all the pulleys, but it is suggested that fiber or aluminum be used for the idler pulleys. These, of necessity, must be very thin to clear the idle belt. Note that all the drive pulleys are grooved 60 degrees. Round belts are used for transmission, and after a little wear they will assume narrow, flat sides which (Continued on page 136) Inventions for February 95

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Fireless COOKER, ‘Refrigerator in ONE At left is seen the com- pleted hot- cold box ready for duty. Photo at top shows how space be- tween boxes is packed with a balsam-wood insulating blanket, for greater heat re- tentiveness. At right you see illustrated manner in which cor- ners of box are glued and nailed together. OU will find many uses for a small box having thick walls of heat-insulating material. It can be used as a storage place for ice cream, a quart remaining in the solid state for several hours: or it can be employed as a fireless cooker by inserting into the insulated chamber a-container of partly-cooked food and letting it remain for a few hours. 'The box can easily be taken on picnics or camping trips for use as a refrigerator. If a small quantity of dry ice (solid carbon dioxide) is added, the contents will remain frozen all day. The box illustrated has a chamber meas- uring about 4x74%x6% in. This is large enough to admit a quart of ice cream, whether in the form of a brick or packed in any of the several types of containers. Walls of the box are 2% in. thick, and are composed of material having a high in- sulating value. Balsa Wood Makes Case One satisfactory type of material to use is balsa wood, familiar to model airplane builders as the lightest wood obtainable. Because of its numerous air cells, this wood also is an excellent heat insulator. Or you can make the box entirely of one of the several insulating wall boards whose name ends in *—tex"; or partly of this material and balsam wool, asbestos or similar in- sulator. 96 The latter method was used for the box shown, which was built at a cost of 40 cents. It has 2% in. walls. An outer shell was constructed of % in. insulating board, the corners being formed by glued miter joints. An inner box was made in a similar man- ner, except that simple lap joints, held by glue and long finishing nails, were used be- càuse appearance was not important. The space between the two shells was packed with pieces of balsam-wool insulating blan- ket. Lid Should Fit on Snugly The lid, which is shaped so that part of it fits down into the outer shell and inner chamber, was built up by gluing together four pieces of the insulating board. Edges and inside surfaces were painted with shellac to prevent crumbling. Wood block handles were fastened to the ends. 'The outside of such a box can be finished in any manner desired, preferably in a light color to prevent absorption of heat if the box is to be used mostly for preserving frozen materials; or dark if it is to serve more as a fireless cooker. А water glass containing a mixture of ice and water was placed in the box for testing purposes. After about three hours the ice had melted, and at the end of eight hours the water was still ice-cold. A larger quan- tity of ice probably would have remained solid for a longer time, because it could absorb more heat from the inner walls be- fore melting completely. The box can be decorated in any way you wish, or set in a special sturdy frame on a small table. Modern Mechanix and

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Chemical Gun for the Home Laboratory Substances placed within this pipe retort are subject to chemical decomposition when heated sufficiently by the . burner, 'ТҺе gases evolved pass into an empty bottle, then into a bottle. containing water oz some other liquid. НЕ chemically inclined will be interest- ed in carrying out these two simple ex- periments. The first has to do with paints which change their colors. This chame- leonic virtue is the property of some chemicals when heated. Red iodide of mercury mixed with a vehicle such as thinned clear spar varnish, gum arabic solution, collodion, or celluloid- acetone solution makes an ideal paint which changes from red at room temper- ature to yellow when its temperature is raised. The double iodide of mercury and cop- per is scarlet and when heated to 158 degrees F. turns black. This is made by adding a solution of potassium iodide to a solution of copper sulphate until the pre- cipitate, or “cloud” which is formed, dis- solves or disappears. Then a strong solu- tion of mercuric chloride is added, which will precipitate the red double iodide. This is allowed to settle, and the clear water ` poured off. Then fresh water is added, allowed to settle, and poured off again to purify it. The double iodide of mercury and silver is made the same way, only to potassium iodide solution is added a solution of silver nitrate, until the precipitate redissolves. Then mercuric chloride solution is added which will precipitate the yellow iodide of silver and mercury. It changes color at 113 degrees F. The paints have numerous applications. One may paint bearings with them, using a suitable vehicle as given above to indicate when the bearings are running hot. Flow- ers and other cut-outs so painted will change their color when held over a hot radiator, candle flame or lighted cigarette. One may try the paints on automobile radi- Inventions for February The painted flower will change colors when heated over candle, Bearings painted with the same chameleonic colors do the same and indicate that the metal is running hot. ators, just back of the filling cap, as a means of ascertaining when the engine is over- heating. The second experiment has to do with the chemical fun to be had with a pipe fitting “retort.” A 6 in. length of 2 in. pipe, capped at one end and fitted at the other end with a %” delivery tube by means of a reducing socket, is used. Substances placed within the pipe retort will be sub- jected to chemical decomposition when the retort is heated by means of a Bunsen bur- ner. The gases evolved should be passed into an empty bottle, then into a bottle con- taining water or.other suitable liquid. Marble heated in the retort changes into lime and carbon dioxide gas escapes from the delivery tube. If the issuing gases be passed through lime water in the second bottle, the water will be turned milky. A mixture of manganese dioxide and potassium chlorate will produce oxygen gas -when heated. Magnesite, a mineral (magne- sium carbonate), will produce magnesia (magnesium oxide, MgO) when heated, and also carbon dioxide gas. 97

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Worn-out Files Make Excellent Work Shop Lathe Tools Top view shows file being ground into a chisel. Handle may be attached as shown. Lower photo, chisel at work. HY spend money for lathe tools when you can make excellent ones from worn- out files? Such files can be found around almost every work shop and, if not there, can be purchased for practically nothing. Flat files are preferable as they will make a greater variety of turning chisels, al- though round and square ones can some- times be used. The file is converted into a chisel on.a grinding wheel. First, grind the teeth from the end of the file away from the handle. Be sure to smooth all rough edges so they will not cut the hands in future use. Then grind the end to the desired shape; round, angular or square. Finish on an oil stone. You can provide each tool with a handle, use a clamping-type file handle for several chisels, or employ the tools without handles by simply cutting off the pointed portion of the file. You will find that the steel is of excellent quality, and will hold an edge for a long time. Unique Death Test Easy to Apply NOTHER test of death, said to distin- guish infallibly between real death and mere suspended animation, has been re- cently devised. The test consists in squeez- ing one of the eyes of the supposed dead person between two or more fingers with considerable pressure, but not enough to damage or.burst the eyeball. In a dead body, this pressure will change the pupil at-the center of the eye from its usual circular shape to some other shape. If the person is still alive, even though un- conscious and showing no ordinary sign of life such as breathing or an audible heartbeat, the pupil will remain round no matter how hard one squeezes. 'The test was applied successfully to 649 dead bodies and to 6 cases of apparent death in which the persons were alive. Here Is a Kink That Develops Vest-pocket Films Without Watching GERMAN technician recently devised a new method of developing vest-pocket roll films that is inexpensive and requires no watching. Take two glass jars of two quart capacity, preferably with screw tops, and mark one “developer” and the other “hypo.” Enclose them in a carton box and stuff the extra space with crushed paper. Two buoyant blocks of wood and four thumbtacks complete the equipment. - Fil the glass jar marked “developer” almost to the top with water and add two ounces of liquid developer. To develop the films, retire to a dark place or use a chang- ing bag. Detach films from their paper covering and fasten the ends to the block of wood. Before submerging, dip them in the *developer" to prevent air-bubbles. Leave for several hours and then plunge into'a bucket of water a few times before immersing in hypo. 98 Неге is an illustration of complete developing apparatus. Modern Mechanix and

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Сои to Hook Extra “Receivers to Antenna HE rabid short wave fan and radio con- structor in time will probably collect several receivers beside the broadcast set. By using the stunt shown in the sketch one antenna can be utilized to feed several re- ceivers, all operating on different frequen- cies. Erect one good antenna system for the broadcast set and allow a branch of it to come into the short wave shack and stretch overhead in a horizontal line. Then con- nect each other receiver to it as shown. This consists of coiling from six to twelve turns of insulated wire around the antenna; spacing the turns half an inch apart or so and maybe half an inch or more in diam- eter. A neat way to do it is to slide three or four pieces of very small mailing tube over the antenna and wind the coil on each one. Then you will have a pickup coil ready any time an extra receiver is to be attached. A c NTENNA SWITCH TO ANT. POST ———— With condenser, grid leak and switch hooked into antenna circuit as illustrated here, crashes of static are softened con- siderably, while signals come through loud as ever. Try This Stunt to Reduce Static N EFFECTIVE stunt for reducing static consists simply of breaking the antenna lead-in wire and inserting a common grid leak and condenser. A .00025 fixed conden- ser appears to be about the right capacity. The grid leak can be the common receiving type and preferably 1 meg. or higher. Lower resistance values seem to allow too much signal strength to pass. Shunt the condenser and leak with a switch as illus- trated in the drawing. The idea is, of course, to allow some of the static discharges to back up through the leak. The condenser acts as coupling from antenna to grid coil. On loud locals and with a low leak value, much of the crashing static is cut out. Inventions for February 6 TO 12. LOOSE TURNS OF INSULATED WIRE ANTENNA MAILING TUBE: TO RECEIVER BROADCAST RECEIVER PICKUP COIL Taps are taken off the broadcast antenna for extra receivers by inserting small tube over lead in and wrapping with short length of wire, which leads to the set. Plug-in Coils Use Tube Bases MEERE are many occasions when it is an advantage to plug in choke coils, induct- ances, etc., but the lack of plugs and jacks is a handicap. Good “plug-ins”, however, can be made by the amateur. First cut off the shell of the tube base leaving just the wafer at the bottom. Then saw this into four equal parts each contain- ing a prong. Then cut the socket into halves or quarters as your needs dictate and pro- vide each section with screw holes for fastening to the baseboard. The prongs can be soldered to the inductance ends as suggested and plugged direct into half a socket, or they can be used separately. - This plug-in arrangement will prove 1deal for short-wave transmitters in which in- ductance coils have to be changed to shift from one wave length to another. SAW TUBE à BASE INTO 4 EQUAL j TRIANGLES p ER SAW SOCKET IN HALF HOW TUBE BASE IS PREPARED PRONGS SOLDERED SAW BOTTOM WAFER FROM TUBE BASE RESULTING PLUG Inductances are soldered into tube prongs, which are inserted into base connections as illustrated in drawing. 99

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HEN a man becomes really enthusiastic about the amateur radio transmitting game he yearns for a high speed key for rapid fire operating. The ordinary key is incapable of the speed of the “bug” but the cost of the latter is often prohibitive. The bug shown in the photograph was built entirely of spare junk around the shop and works just about as nice as could be desired. Moreover, there is no machine work to be done as all parts can be turned out with the simplest tools. The cost is practically nothing. The base consists of a piece of thin wood 10 in. long by 4 in. wide mounted on four *feet" consisting of a hard rubber binding post head under each corner. The pivoted arm consists of four parts. Themain portion is a piece of !4 in. square brass about 4 in. long. To one end is soldered a piece of narrow corset steel 4 in. long and to the other end is bolted a strip of stiff brass to project beyond the end about 1% inch. Steel Spring Gives Vibrating Action А second piece of corset steel should be “bent in the form indicated and soldered to the first in about the location shown. Now to the end of the brass strip bolt a knob consisting of a piece of bakelite or hard rubber cut in the shape shown in detail. At the rear end solder some sort of weight. In the bug shown this weight consisted of a short piece of variable condenser shaft fastened on with a collar and set screw. The pivot frame was taken from an old alarm clock but any similar affair can be used. The pivot was that supporting the balance wheel. A small hole was drilled through the brass piece about a third way down its length from the rear end and the pivot forced through and soldered. The 100 BRASS STRIP PIVOT FROM BALANCE WHEEL OF CLOCK RUBBER BINDING POST HEAD Assemble the parts for the “bug” as illustrated in the drawings here. Throwing the knob to the left makes a dash, while throwing to right makes a series of dots, speed depending on springiness of steel and weights on end. pivot was then mounted in its frame and the latter fastened to the base in the posi- tion shown. Tension of the pivot bearings was then adjusted so the arm swung freely but without lost motion. . The brass bar of the arm should swing in a space about % inch wide and this was formed by two binding posts holding two wire nails bent up at right angles and these verticals covered with spaghetti. Making the Bumpers Now near knob and contacting the brass strip is placed a binding post into which is adjusted a switchpoint as shown. This contact occurs when the brass bar is cen- tered between the bumpers. A second binding post and contact is placed opposite the projecting corset spring so it normally rests about % inch back. Then a rear bumper is placed near the end of weight in the position shown. This bumper can be made as the two bumpers ahead are made, or instead of spaghetti a small piece of eraser can be speared onto the upright part of the nail. Lastly connect an inner tube valve spring in the position indicated. This spring ten- sion must be regulated to obtain the proper working tension. Arrange two circuit binding posts at one edge of the base and connect them as shown by the dotted lines. One connects to the frame and the other to the two stationary contacts. When completed the bug can be hooked into the key circuit or shunted across it as an auxiliary key. Its action is as follows: When the knob is pressed to the left so the brass strip contacts its binding post the circuit is completed and a dash is made as (Continued on opposite page) Modern Mechanix and

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Automatic Signal Key Makes Dots While You Stand By SEWING MACHINE MOTOR CAM MADE ОЕ" VARIABLE COND. M HALF OF Sy LARGE WOOD SPOOL. FORD COIL ARMATURE TO ARMATURE CONTACT POINT | | | | 1 WOOD SUPPORT FAHNESTOCK CLIPS Т o . TRANSMITTER KEY CIRCUIT Series of dots are made by this automatic key while you "QRX." Cam forces armature down, breaking circuit, then lets it rise again to close circuit. Spring which rubs against hub of the spool should be adjusted to provide even speed. pets crazy looking gadget that looks like a coffee grinder is nothing more than an automatic signal key built by the radio editor to operate his transmitter during a short period when he had to “stand by” for some reason or other. During that period the fellow at the other end could hear a series of rapid dots and thus hold the wave until the operator could again get back to the key. First, an old sewing machine motor was mounted horizontally on a piece of board. Then a large wooden spool was sawed in half lengthwise and the bobbin end driven on the motor shaft to make a tight fit. Then an old variable condenser plate was fastened to the spool flange as illustrated. Just below the spool flange was arranged a Ford coil bridge or armature held hori- zontally by being mounted on two pieces of wooden film spool as shown. In front of this armature was arranged a hook of stiff wire so the end pointed down and made light but positive contact with the surface of the armature. When the cam is at the bottom it should push down the armature so contact be- tween it and the wire point is broken. Connect this contact point and the arma- ture supporting bolt with two wires leading to the two binding posts or clips at the end of the baseboard. Before plugging in the motor insert either a variable resistance or a lamp socket in series with one of the 110 volt wires. Vary the resistance so the motor turns over about twice a second. A 25 watt lamp in- serted in the circuit will give about the right speed. Then again the brake strip against the spool will help. The action can easily be seen. Two “dots” a second are made if the motor is turned over at the right speed. : When the cam is up contact is made and the transmitter is in operation. When the cam is down the contact is broken and the iransmitter is silent. A switch should һе arranged so that the automatic sender can be cut into the circuit easily when you have to stand by for some reason. The dots issu- ing from the transmitter will enable your listener to keep on your wave. An Easily Made High Speed Bug for Fast Sending Transmitter Hounds (Continued from opposite page) long as the contact is maintained. Releas- ing the knob the spring carries the pivoted arm over and the piece of corset steel vibrates against contact, the rear contact making dots at each contact. This rate of vibration is greatly determined by the size of the weight and the flexibility of the Inventions for February spring, which you can adjust to suit. There is nothing complicated about this bug; the only thing being to adjust the spring tension and the weight to vary the rate of oscillation of the arm. The contacts can be varied by screwing the contacts in or out of their binding posts until the prop- er balance is obtained. 101

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Up-To-Date *Jtomes “Have Bed is equipped with springs that fasten to inner panel. When bed is open, it rests on two leather- covered stools built especially to support it. Even in a house where the doors are finished walnut or Oak, these cedar-lined wardrobes are usually enameled to match the baseboards and door frame of the room. LTHOUGH there has been a gradual but drastic change in home-building in the last few years, "at least one demand has remained constant, and that is the home maker's insistence upon ample accommo- dations for books, kitchen utensils, pro- visions and clothing. Although today’s home is smaller than the Victorian home, more space is given to book shelves, cupboards, and closets than heretofore, and the space is utilized to better advantage. The accompanying pho- 102 Behind these attractively stenciled doors of walnut are hidden magazines and books, containing valuable infor- mation, that are no longer presentable to the house guests. tographs show practical ways of handling these features. The arrangement of the kitchen’ cup- boards shown is perfect. The commodious bins and shelves furnish plenty of room for groceries, cooking utensils, flavorings, cleaning powders, soaps, kitchen linens and china. Suites of kitchen units may be bought either of the detachable type or ready to build in. One may begin with a single cabinet and add pieces until the entire available wall space is covered. It is interesting to note that the kitchen space above the refrigerator is no longer wasted in the efficient kitchen but is util- ized in the way depicted. This arrangement is thoroughly practical for the refrigerator may be slipped out of the enclosure without disturbing it as the grilled portion is a hinged door. Built-in Wardrobes Are Popular Built-in, cedar-lined wardrobes are prov- ing very popular both in new and modern- ized homes. The usual arrangement is to have a space at the bottom for shoes and two shelves at the top for hats, the out of season hats going in the top shelf. The double doors to the right protect sliding tray-like drawers of varying depths. Built-in beds aré a convenience in the small home. By using one of them, it is possible to turn a living room, nursery, library, or den into a bedroom at a mo- ment’s notice. If desired, these beds can be equipped with box springs and be fully as comfortable as any others. After being made up they are folded back into a closet. The bed shown is simple in arrangement, the springs being fastened on the door. When the bed is open, it rests on two sturdy, leather-covered stools which were Modern Mechanix and

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There is plenty of гоот.іп these cupboards for all the necessary kitchen utensils. They are stained an attrac- tive shade of green with the panels outlined in cherry red. built especially to support it. The room is furnished like a library with a large table and easy chairs. Thus, it does not reveal its double purpose to the casual observer. Today's magazines contain such valuable material that many people keep them. Un- fortunately, magazines do not stay attrac- tive nearly as well as books, so that it is well to have shelves for the older numbers, where they may be hidden from sight. The highly pleasing arrangement shown pro- vides a desirable place for magazines and books that are no longer presentable. Doors and door frames are walnut with a formal design stenciled on them. Built-in Features Add to Home Value А home can hardly be considered up to the minute today unless it contains the features just described. Built-in features that are well designed add twice their cost to the value of a home, both in dollars and : cents when it comes to selling and in the convenience that they afford. Fortunately, the home owner living in a house several years old may avail himself of any of the features described at little more cost and trouble than the owner can of the home under construction. Inventions for February «BUILT-IN Geatures Cupboard built above refrigerator utilizes extra space. 103

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Build a “Towser «oickler" for Your “Dog Above photo is a front view of the dog scratch- er showing the seven wire brushes in place to welcome the canine. The base of the scratcher is 36 in. long. The device should be built about the actual height of the animal at the shoulders, The floor of the base is covered with canvas or a rub- ber mat to allow a good footing when scratching is taking place. LL normal dogs have three major inter- ests; eating, sleeping and scratching. In the case of many dogs, the scratching comes first. So, in order to protect upholstery, beds, shrubbery and other objects used for the purpose, a highly efficient scratcher can be devised. It consists of seven wire hair brushes securely fastened under a wooden arch through which the pup passes for treatment. In order to accustom dogs to the device, it's a good idea to place it at a small open- ing provided for them in the back fence or some other exit around the home. The *tickler" is equally effective used in either direction. : The size of your dog will of course deter- 104 Here you see à side view of the “Towser tickler." Dog scratches its body by a forward and backward movement against the brushes. This is a detail drawing showing all dimen- sions for the construction of the “Towser tickler." Note how the seven brushes attach to central arch. The three arches are built to permit covering with a cloth, making it a simpler task for dog to find his way through the opening, The brushes are of the type having wire bristles set in rubber so they will give when the canine rubs against them. mine the dimensions of the arch. It should be built about the actual height of the ani- mal at the shoulders. When the brushes are installed, he will then receive a thorough scratching. Build the base about 36 in. long out of ordinary 94" material and erect the central arch. The brushes are attached with two screws, as shown in detail drawing above. Brushes may be purchased in the ten cent store for a dime apiece. Have the wire bristles set in rubber so that they “give” easily. The end arches are the same dimen- sions as the central arch and only necessary if a cloth covering is to be used. The cover- ing makes it simpler for the dog to find his way through the arch. : Modern Mechanix and

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High Speed WASH BOX for Cut Films que cut. films now so widely used by amateur photographers are easily handled in small trays except for the final washing operation. You cannot let them float around at random in a tray with water running in it, as they are too stiff and will scratch each other with their sharp cor- ners. Yet cut films are, unfortunately, not Stiff enough to stand straight in the ordi- nary plate washing box. A solution of the problem is to build yourself a special cut film washing box. In the box illustrated here, the films are held in grooves, each getting the full effect of the flow of water. It is fitted with a remov- able partition and washes either 5x7 or 9x12 centimeter cut films. А row of %” holes is drilled in the base : of the partition, through which the water . flows into the film compartment. The over- flow holes also are made with a !4" drill working at an angle upward toward the inside of the box. With the flow of water downward through these holes, the inside opening is not completely covered. Any scum or dust on the surface of the water is immediately drawn off. Horizontal holes would not pro- duce this effect. The grooves should be about %” deep. Place a small square strip along the bottom of each row of grooves in D. ends, with the bottom dadoed to set in JA". The box was put together with casein glue and then. waterproofed with spar var- nish diluted fifty-fifty with turpentine. The

The photo directly above is a top view of the wash box with two cut films in place ready for the flow of water. Their natural springiness keeps them in the grooves. The attached iron bars are a meaas of holding the par- tition in place when water flows through the box. The photo at right shows the 1⁄4” holes drilled in the partition and end boards. The partition can be removed and inserted in groove further back to take larger size films. Holes of Partition board are in the bottom. Inventions for February Construction details cypress, being porous, soaks up this mix- ture almost as fast as you can put it on and that is exactly what is desired, because waterproofing is the object of the treat- ment. Apply one liberal coating and keep going over it for about half an hour. Then let it stand for twenty-four hours and re- peat the treatment. If you use a partition in your box, be sure and weight it down, otherwise it will bo up when water runs through. 2

GROOVES $ DEEP SPACED } EY 59 TONGUE AND GROOVE Fe =< GROOVE

ANGLE IRON WEIGHTS {вох MADE OF 2 CYPRESS = STRIPS Bottom 1° 4 DADOED

HOLES BETWEEN CH GROOVE

are given in drawing at top. In the photo above, note how easi- ly 14” holes carry away heavy flow of water. Collection of surface dust is prevented.

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New Sport— Hop on “Kangaroo Sandals” | | 5” o FOUR WOOD SCREWS SECURE END COIL IS FORCED INTO GROOVE TURNED IN ANCHOR BLOCK Lene nie = * + Hop around on Kangaroo shoes in manner shown here. Oilstone Has Dropper Attachment USEFUL addition to the home work- bench is this clever arrangement of an oilstone with dropper attachment. It is constructed for the purpose of assuring an ever ready lubricant for your oilstone. The bottle holder is made of wire, bent in the manner shown in photo below. The “cork” is made of wood with a small hole bored through it so that when the bottle is laid down in a horizontal position the contents can escape drop by drop. The lubricant container, returning to a verti- cal position, becomes airtight and closed. Bottle drops lubricant on stone while you sharpen tool. 106 TE ——— —— I^ TO ^ PINE. CUT PATTERN TO FIT RIGHT AND ^ LEFT SOLES. APS Tb Р. Chief constructional details are set forth here. То prevent buckling, secure the ends of the springs firmly around the anchor block. Heel plate is made from metal or fibre. HESE “Kangaroo Shoes" are an offshoot of the “Pogo Stick," although much more thrilling to operate. When one ac- quires the knack of wearing them, he is bound to be the envy of the neighborhood youngsters. Most of the construction details may be gleaned from the illustrations above but a few points should be made clear. The selection of suitable springs is very es- sential. Use five strong and husky ones from the larger type automobiles. If you weigh over 125 pounds, use six springs. The junk dealer should be able to supply a set of these. Take especial note of how the springs are attached to the top and bottom boards. Spring retainers are turned of hardwood with a groove at the end next to the boards. The springs are forcefully driven over the high point and into the grooves. Then four wood-screws hold the end coils in place. Be sure that the ends of the springs are held rigidly against the boards, otherwise the ends will cock up and the springs buckle in the middle. Walking on the “Kangaroo Shoes” It takes time to learn to walk on these shoes. At first try, they will feel like lumps of jelly under the feet, but after a little practice one can balance on them as easily as a wire-walker balances on a wire. After the familarizing process is over, start performing tricks; particularly hopping around like a kangaroo. If a user’s weight is “in tune” with the natural vibration of the springs, the long hops possible are amazing. Be sure to practice on a grassy lawn until the knack of using the shoes is acquired, as one is bound to take a few falls in the beginning. Modern Mechanix and

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Chassis of an Old Car Makes Novel Swing for the Children T funny looking contraption in the photo at right sees plenty of service whenever children gather to play. It is a cut-down chassis of an old automobile, held by four chains which attach to an overhead iron pole. The youngsters pile in the seats in great numbers while a few, who are dele- gated to furnish the power, push the novel swing back and forth. It offers pleasure to a much greater number of children than the ordinary swing. Tracings Utilize Lighter Fluid OU can fool your friends and make them think you are really a first class artist by following the instructions given here. Attractive drawings or tracings of photo- graphs and sketches may be made to appear like the real thing. Moisten the surface of a piece of tracing paper, which may be heavy drawing paper if desired, with a few drops of cigar lighter fluid. This makes the paper very trans- parent. The tracing is made with an ordi- nary pencil, and, due to the lighter fluid which acts as a lubricant, the pencil trac- ings will show up unusually dark, as if one were tracing with pen and ink. Although a bit slower, equal success may be had with pen and drawing ink tracings. The lighter fluid will evaporate in several minutes, leaving a clear, clean tracing. Attractive drawings or tracings of photographs and sketches are possible with the use of a few drops of cigar lighter fluid, Spread on the paper, it makes it very transparent. Invisible Glass for Show Windows NVISIBLE glass for store show windows, for use in front of paintings in art gal- Jeries and for other places where protection is necessary but must be unnoticeable has been recently invented. The secret is to curve the surface of the glass pane so that reflections of all objects in front of it are not seen. Freed from these reflections, the glass itself becomes virtually invisible. The precise shapes which are best depend some- what on circumstances but usually they are parabolic, not unlike the reflecting mirrors used in searchlights. Edges of the glass, as well as top, must of course be concealed in the mounting. Inventions for February Many children may ride on this improvised swing at one time. The cut-down chassis of an old automobile is used which hangs by four chains from an overhead iron pole. Mouse-trap Release Takes "Snap" O MAKE this demountable, automatic trigger release for your box camera, use an ordinary mouse-trap, a small length of copper wire and a piece of string. With trap sprung, remove the trigger trip and re- mount at the opposite end as shown in the photo below. Cut a 2%” piece of copper wire, fastening one end to the wire “jaw” of the trap, and looping the other end over the camera trigger. Then drill a small hole directly underneath the trigger-trip, and run a length of string through the hole, tying same to the “tongue.” To set the release, lift the spring and rest it on trigger- trip. Now get off to the proper distance and, when ready, pull the string. Run the string down the tripod leg so that it is out of range of the lens. You may take your own picture with the device shown above. It consists of a mouse-trap release which trips the camera trigger and snaps shutter when you pull the string. 107

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Gear Case Cover of Dural; Breather Pipe, Magneto Bracket Also Shown “NOILISOd NI 413425vH8 OL3NDVW “9078 OLNI аузын: ` YNASUSLNAOD SM3H2S 1x31 33S—— “TANVWd YBAOD NYHL SANILNOD LON S300 30H YJLN3D'JLON anis uv35 ИУ? ONVH-LHOIU НОЗ M201g LYOddNS ' JO "viaa ома из заа є у S! 3did u3Hiva3udg (301S 1337 зо MBIA) Y34009 3SV2-HUV39 JHL H3AOÀ NI gi 3NIHO VW, E it “BZYSHM3S 73 NMOHS чу $W31! 3S3HL "SM3!IA 3S3Hl NI Hv3ddV LON оа L3NHS-3AIHQ dnd аму '3AIHO OL3NOVN '3AI80 83L13AOHOVL JHL *3LON лузпа 1S/| 3O L33HS WOH3 CINYNL (зам! зо M3lA) YAAOD 3SV2-uV39 ЗНІ T1VM 3S YO аму H3A00 N33M138 из u3l3Wvia зам S 30 | pa 32vdS 38ni SSVY8 "wvia € o1 нзлоэ NI S330H эні 39HVN3 мэні заза Ёз "3SV2 JHL NI 5355089 MAYIS OLNI ; OL ау ONV T1180 үза & зо ѕзлон Mayos з$зн1 тича SEITE) ELER EEE зн чо; "? ‘'waLanvia ҢӨ зо злошо V NO The gear case cover is made from a sheet of 17ST Dural, which is furnished with the castings if you buy them from Long. This drawing shows how the case is drilled for breather pipe, tach, magneto, and oil pump drives, but installa- ive the G is unit, for the hi ilding process. ing out t implify the bu ill greatly s ich w Study the text closely when work ce wh ing. ien draw is own exper rs out of h job the care you would bestow on any fine piece of work, and you'll be delighted with the results. 108 its is shown on a separate ful pointe ives you use f these latter un tion o author g Modern Mechanix and

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The Harlequin motor mounted in Les Long's home built Parasol monoplane., The aircraft inspector in Oregon, Long's home state, has placed his seal of approval on this nifty motor job, describing it as one of the best he has ever seen. Ghe LONG HARLEQUIN сСМОТОВ by LES LONG Here's the final installment of Les Long's story on building a low-cost, dependable light airplane power plant from motorcycle stock parts. She's a honey, and you can build her on a pocketbook that's nearly flat. К we're ready to make up the gear case cover from the sheet of 17S T Dural furnished with the castings. Turn out a disc a trifle larger than the outside of the rear end of the cam case. Turn the rabbet to fit the one already turned on the casting. They should fit snugly the same as those at the center line of the main case. Note the drawing of the cover carefully and you will understand the positions of the various holes. You can scribe center lines at right angles and lay the cover off with a rule, or it is much simpler to lay the blueprint directly on the cover and prick the centers for all the holes through it. It is best not to drill the holes for the pump shaft and tach drive bushings full size at first. Drill them say %” and then lay best way to locate this is to put a touch of paint on the end of the stud and then drop the cover in place. The paint will show where to put the supporting block so that it will fit without a chance of bind- ing. The slightest error otherwise would make it impossible to get the cover on, as the stud must fit snugly in the hole in the little block. With this done you can look right down through the hole for the left hand gear arrangement and see that it is in line. Make up the tach drive bushing and the pump shaft bushing of bronze as shown. The nuts used are ordinary nuts sawed in two. Make up the tach drive shaft and drive it tightly in its gear, which is the regular Harley shaft or breather gear. The the cover in place and see if they are going to fit. If not, work them till they do. You will notice on the drawings a piece of 114" by 1%” by 3/16" Dural screwed to the cover on the right hand side. This is to support the right hand cam stud. The BLUEPRINTS FOR THE HARLEQUIN MOTOR A complete set of full-size blueprints on the Harlequin metor is available from Modern Me- chanix and Inventions Blueprint Department at $5 per set. These blueprints are made from the original drawings which illustrate this article, but they show practically all the parts in actual size, as cannot be done in the small confines of a maga- zine page. One of the most beautiful and com- plete sets of drawings we have ever seen. Address the Blueprint Department at 529 South Seventh Street, Minneapolis, Minn. Inventions for February entire tachometer as- sembly should k2 put in place and held by the retaining strap shown. The pump drive shaft is now made up. Use N. S. _shafting and make it exactly to the dimen- sions given. The first thing to do is to drill out the outer half 109

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Oiling System Well Shown in This Drawing; Also Offset Rocker Assembly 3iNVL нона 3NIT NOILOnS SN уму WO OL 3NI1 Nuni3ay 3unsS3dd 1OHINOD OL 3202-dO1S: 'aonvo 3unss3aud OL Jdid ONINV3d aonvo 01 NIV OL te] on id dN-YOOH dWnd JO Wv39vIO MIIA dOL 3S0H uaeand айпа OL зма anns С S310H 1108 ‘LNNOW y ЧОЗ 5NIOVdS EL "ма, S € 30109 34 VLN! зо NOILISOd 2 1 3AIBQ'HOVL | ee. омчуза NIV OL 3NI 3ufisS3ud SNIMOHS MAN3ssv Y30904 135450 'S31v'd 31434v8 "LINN 3S v2 40 MIIA 3915 13371 is line Use great 1 feature of the Harlequin and must be learly shown and no difficulty whatever should in. the tubing; 5/16 in Note the directness of lines to various parts of the motor. Modern Mechanix and 15 an unusua gh this plan. Do not allow sharp bends This ly into position. The position of the oil baffles is c The oil lines may be fully understood throu, used throughout, with the usual fittings. care in fitting the offset rocker assembl assembled with absolute precision. be experienced with them. 110

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Marvelously Compact, Clean Design oj the H arlequin Shown in Side View RIGHT SIDE VIEW OF MOTOR SHOWING MAGNETO MOUNTED Compact arrangement of magneto in relation to motor shown in this outline view of the right side of the engine. of the bushing in the cam gear. Simply take a %” drill and run it a trifle over half-way through the gear, thus remov- ing that part of the bronze bushing. Turn the end of the shafting so that it makes a very tight drive fit in the gear. Drive it in and then chuck up the gear and pro- truding shaft and finish the turning. This is so the shaft will be true with the gear. Check the gear carefully, both for center and for wobble. You will notice that there are two places where the shaft is square. Do this with a file, keeping these parts nice and truly square. It should be plain that this left hand cam gear bears partly on the regular cam stud and partly in the bushing in the cover. Tap the hole for the breather. This is a plain %” pipe elbow. Make up the mag- neto bracket of %” aluminum stock: as shown and bolt it on. You will notice that we use a much simplified magneto drive arrangement, which is the reason we can use such a small and neat bracket. You may use nearly any type magneto you pre- fer. We use mostly Simms and Splitdorf. The type used will govern the style of the little gear extension fitting shown. The one shown is for the Splitdorf. The idea is to extend the gear far enough through the 1%” hole so that it will mesh proper- ly with the R. H. cam gear. The end of the magneto must butt squarely up against the cover plate, with a felt washer between the two to keep it oil tight. If the mag- Inventions for February neto happens to have a rounded end, use an aluminum washer as shown. You will have to cut a taper hole in the extension fitting to fit the magneto shaft, and also two key seats, one for the shaft and one for the gear. You can make these with a file. After the magneto is fitted with its gear, which is also the regular Harley shaft gear, set it on the bracket and push the gear through till the two gears mesh properly. Then locate the holes on the bracket for drilling the magneto bolt holes. If the gears seem to bind, shim the mag- neto up slightly. The magneto used is a regular 4-cylinder type and of course runs at engine speed. This makes very easy starting. You will notice that there are no couplings, shafts, impulse couplings or other mess about this arrangement. The drawings show two 3/16” holes in both the cover and gear case, one above and the other below the center. These are for studs to stiffen the cover plate. Simply cut two pieces of tubing having a 3/16" hole that will just reach from the case wall out to the cover. When making final as- sembly put these in place and slip a 3/16" bolt through, keeping the heads inside the crank case and the nuts on the outside of cover. We can now drill the ring of holes to take the screws holding the cover on. Drop the cam gear having the pump shaft on the L.H. stud. Tighten the pump shaft bushing up snugly and drop the cover in 11

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Ingenious Manifold Arrangement Makes Simple Job of Dismounting A REAR VIEW OF MOTOR SHOWING INTAKE MANIFOLD ASSEMBLY 2» S'STEEL PLATE BENT x 16 TO FIT CASE CURVE REGULAR MANIFOLD Zi NUT WELDED TO 2 2 TUBING #7 A AT LEAST 2" CLEARANCE ЫР X 20 GA. TUBES RUBBER HOSE CONNECTION ALLOWS FOR MOTOR HEAT EXPANSION WITHOUT STRAIN CARB THIS GAP IN MANIFOLD ALLOWS FOR MOUNTING OR DISMOUNTING ON THE MANIFOLD.. OF MOTOR BY SIMPLY LOOSENING - MOUNTING FLANGE HOSE CONNECTIONS AND SLIDING 72" HOSE UP ON MANIFOLD TUBE.. 3 GAP IN MANIFOLD WILL PASS 1 BOLTS THREADED INTO CASE ч 5 xX 20:GA. GEAR CASE SIDE OF CASE UNIT THe CASE UNIT AS SEEN FROM THE LEFT SIDE. CENTER SECTION OF INTAKE MANIFOLD SHOWN BOLTED IN PLACE ON BOTTOM OF GEAR-CASE oe В" NUT BRAZED INSIDE SES cerro CARBURETOR Ө g a —_ FLANGE \ =] SUGGESTED ARRANGEMENT FOR k я EXHAUST MANIFOLD.. THE CONSTRUCTION OF THIS ITEM MAY BE CHANGED TO SUIT COWLING УММА, NM ў THE CASE UNIT AS SEEN FROM BELOW.. CENTER SECTION OF INTAKE MANIFOLD IN PLACE ON GEAR-CASE TO SUIT CARB. The principal point of interest in the design of this manifold arrangement is that in mounting or dismounting the motor, all that is necessary is to disconnect the two rubber hose connections and the gap left in the manifold will allow the motor bearers to pass easily. The drawing is self-explanatory. Exhaust manifold arrangement may be changed by the individual to conform to style of cowling chosen. 112 Modern Mechanix and

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Direct Geared Drive to Ma gneto Eliminates Need for Shafting, Couplings TABLE-MOUNT ІХ FLAT HEAD MACHINE SCREWS COUNTERSUNK MAGNETO BRACKET OF З" ALUMINUM STOCK 3". ух I$ CAP SCREW : 1 Magneto bracket fits close to case, allowing direct geared drive without complicated arrangements. place. If with the В.Н. stud in its support, the pump shaft doesn't bind, everything is fine. Take it off. All around the gear case, on the outside make pencil marks oppo- site each screw boss. Replace cover and scribe an 8 15/16" circle. Opposite each of the pencil marks drill down through cover and into the case about 1!4". Use a 5/32" drill. Tap the holes in the case for 3/16” by 24 thread round head screws. Enlarge the holes in the cover to 3/16”. You will see in one of the drawings how the main oil line runs to the rear bearing. Drill a hole approximately in the position. shown to pass !$" water pipe. Drill so that the pipe will just clear the case wall. Run a long drill down through this hole and drill and tap the bearing boss for the pipe as shown. At this time we will mention a detail that was pur- posely not mentioned. Where this oil line goes through the bronze bushing a groove about 3/16" wide and 3/32" deep should have been cut in the bushing. Do this with a boring bar. This groove is to carry the oil around the crank shaft so that the hole in the side of the shaft is always open to the oil. The hole in the boss and bush- ing, the groove, and the hole in the shaft must all register. The distance of all three will be approximately 1 inch back of the front end of the bearing boss. Use a little thought on this. At the top of the %” pipe put an elbow and copper pipe coupling. The oil baffles may be put in now. They are shown plainly and may be of alumi- num, Dural or brass. Fasten them with 3/16" RH machine screws. Using these baffles there is no need for oil rings and the motor gets just the right amount of oil. And now we come to the gadget that looks bad, but is easy to do. It is the spe- cial double oil pump we worked out here. The advantages of a dry sump engine are so many we decided that was what we wanted, so we made it that way. Dry sump engines are lighter, free from smok- ing when upside-down and have far less head resistance. The pumps are both in Inventions for February one unit. They are made of the regular Chevrolet pump. Get two of them at any wrecking house and with a saw and file trim the mounting bracket off one of them. The regular pump cover is as shown and the two pumps are placed face to face with the plate between them. Each part has its set of gears as usual, but you will notice that on the rear pump, which is the pressure part, the gear with the square hole is bushed so that it fits the squared end of the pump shaft. This little bushing can be a strip of 20- gauge copper bent around in the hole and sweated in with solder. After the bracket has been sawed off the rear half the regu- lar screw holes must be drilled clear through with a 3/16" drill. Ordinary stove bolts are used for assembling, going through the rear half and into the front half holding all together. Use the regular paper gaskets made for this pump. The pumps are from the older model Chevro- lets. There are the regular packing nuts with the pumps. The rear one takes the shaft and is packed in the regular way. The front one is soldered shut as shown and screwed in tight. The pump is put on the cover after the motor is assembled, (Continued on page 134) Side view of the Harlequin, showing all parts in place. Compare with the drawing on page 111. 113

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How euch to Spend for a New оте Бер Room j} tzesio d GUEST ROOM (FUTURE GARAGE) wh wipe FIRST: FLOOR: PLAN 3-6-5 Тт [IH СІ BED ROOM | | Ён Cu ОЁ KITCRENETTE| LIVING = DURING: RM | Соз очу 8 аши PORCH SECOND -FLOOR: PLAN 3-6-5! Here are floor plans for the two attractive homes shown in the drawings 114 at top of the page. HOW TO GET BLUEPRINTS, PLAN BOOKS A one-sheet blueprint of any house appearing in Modern Mechanix and Inventions magazine may be had for $1.00, postage prepaid. Two new plan books, "Homes for Newlyweds,” > containing 32 of the latest ideas for low cost homes, and “16 Selected Homes for Lean Purses" containing. time, space and labor- saving bungalows, may be had for 15 cents each, or both books for 25 cents, postage prepaid. ` Address Home Building Editor, Modern Mechanix. Above is seen house built from plan No. 5-S-32 — having five rooms and bath. House No. 3-G-51 may be seen at the right. А feature is the balcony which does duty as a sleeping porch in summertime. jue depression has taught us a lot of things about money put into some banks as well as sóme homes. Even though times are hard and incomes lowered and many people unem- ployed there are still thousands of folks who have reasonable sums of money for home building but they are afraid to take chances. The question they want answered is, “How much to spend for a new home? What is a safe investment in these days of uncertainty?" Today with the purchasing power of the dollar ranging anywhere from 20 to 40 percent higher than in boom times it’s not perhaps so much a question. of how much to spend, because everyone wants as much as possible for his money, but how much one can afford to spend due to fewer dollars in circulation and family pocketbooks growing thinner. Today, because of cars, decreased incomes, increased taxes, and other things, shelter percentage has been squeezed down to around 16 percent and in some cases, less. Out of $1,800 per year income, $24 per month, or $288 per year, is about the limit most families of average income can stand. Two Attractive Homes for Your Consideration The two houses I have selected for this month's issue are fine examples of what can be done with first, an average income; and second, a greatly lessened income. Plan 5-S-32 is what may be called the most popular of all standard bungalow designs. It’s a straight-forward combina- ' tion of living room, dining room and kitchen on one side of the house with two bedrooms and bathroom on the other. There's space above for storage and small sleeping accommo- dations. The house is 36 feet long and 26 feet wide. There's a full basement and complete insulation throughout. The house may be built of stucco, as shown, or of brick. А fireplace is a feature of the living room. This can be omitted and would save per- haps $200. There's a brick base course around the house. About the cost? With present day prices for materials and labor this house as shown should be well under $5,000. This is a suggested price range. The cost may be considerably less depending upon where and how you build. It should come well within the range of average incomes, even in depression days. (Continued on page 132) Modern Mechanix and

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All parts necessary for construction of bel- lows are seen in photo above. Note decora- tions on face of front piece. Assemble the valve as illustrated at the top drawing. In the photo at right showing the completed bellows you will see how large headed tacks enhance beauty of the device. Strap on end of handles holds them together when the bellows are hung up beside fireplace. FRONT MAHOGANY OAK OR PINE Ё THICK 21" VENT HOLE Front and back pieces should be cut to dimensions given in this drawing. The strip of cane serves to hold the leather out during the pumping. HOSE who have a strong liking for the antique will enjoy making the pair of bellows shown in the above photographs. They make a very attractive accessory for the fireplace and bring back a bit of old world charm. Walnut is recommended for making the back and front, but mahogany, oak or pine may also be used. The front and back pieces are cut to the dimensions shown in the accompanying drawings. The extra length of the back allows the front to hinge onto the nozzle block. The decoration may be varied to suit the taste of the maker. Carving on wal- nut gives a very rich effect. This should be done before assembling the parts. Make the vent as illustrated in the draw- ing at the top of the page. The wood block is glued to the leather and the latter is tacked to the back piece over the 2 inch vent hole. There is also a narrow strip of leather tacked at each end and looped loose- ly over the block to prevent the valve from opening too far. The nozzle used in the tip is the end of a %-inch water nozzle and is a stock part. As it is only 1% in. long, it is neces- Inventions for February ' Old Fashioned “Bellows “Decorate Fireplace BRASS TUBING FOR NOZZLE LEATHER STRIP VALVE STRIP sary to turn the nozzle block down to meet it. Two holes are then bored in the end of the nozzle block to receive the ends of a piece of cane which is bent to the shape of the sides.and glued into these holes. At the base of the handles, the cane is fastened with a piece of cord or leather tacked to the sides to hold the cane midway between the sides when they are extended. The top side is then placed on the nozzle block, and a piece of leather tacked over the joint for a hinge. With the sides blocked in the open position, a paper pattern is made and a piece of leather cut to the shape of this pattern. This leather is then tacked to the sides, first smearing them with glue. Greatest care should be taken to get the leather on even, so that there will be no wobbling. Small headed tacks should be used so that the fancy headed tacks will cover them later. A binding strip is then made by cutting a strip of leather 5% in. wide, folding over the edges and hammering them down to keep them in place. This completes the construction. Staining, shellacking and waxing makes a good finish for walnut, or any desired finish may be used. 115

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Handy eMANNIKIN forZDRAFTSMEN Cut out sections of anatomy for mannikin according to the squared chart above. Cross marks indicate holes for rivets. FTTIMES in designing seating arrange- ments of boats, autos and aircraft, there comes the question as to just how a man would figure in the proposal. To check this point the little mannikin shown above will prove handy. Very often a scale mannikin placed beside the profile of the finished de- sign will show up errors in proportion that could not otherwise be detected. Every part of the body has been outlined in blocks which represent a square inch on the profile of the average size man. With the aid of these squares the body can be as- sembled to any scale by simply drawing the blocks to one inch dimensions of the scale you are using. Transparent pyralin is the best material Gate Kink Admits Humans, Bars Animals Ho a little kink that every stock farmer will welcome. A person can get through easily enough, to make the mannikin from and next to this comes thin aluminum or dural sheet. Even red fibre will serve. The parts of the body are hinged at the point where the joints of the actual bones in the body occur, and real lifelike positions can be obtained. The joints are marked on each point of the body and it is at these points that the mannikin must be jointed. The joints of the raannikin are formed with eyelets or loose rivets in the case of metal figures. In the smaller sizes it will be just as well to com-. bine the head and torso and foot and lower limb.—Hi Sibley. but cows, horses, etc., haven’t a chance because they lack the intelligence to work the mechanism. On each side of the fence, and about three feet apart, drive two posts approximately six feet high. How this is done is illustrated in the drawing at the right. These posts should be placed so that when the gate is open it will come to the posts, but will not go past them. Wire or boards will do duty as a fence. The gate need not be fastened, for it cannot be left open. Wagons, or. trucks, as you notice, cannot pass.— John Wasson. Р : : 116 Modern Mechanix and

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Keep Up Baseball Skill With “Dart Game Play the indoor ball game by taking position ten or fifteen feet away ftom the target and heaving the darts at it. OU baseball fans who are denied your games in the winter time can have your sport indoors with this novel little dart game. The equipment is not balls, bats and gloves, but a target and a couple of darts, which are pitched from a distance of fifteen or twenty feet, as demonstrated in the drawing above. The target is nothing more than a piece of wall-board two feet square, marked off as illustrated in the drawing below. Scribe the five concentric circles with a pair of dividers, making the diameters, starting from the inside, 2% in., 5 in., 8 in., 10 in., and 12 in., respectively. Bind the edges of the board with tape. Then with a ruler divide your circles into 8 segments, and at the intersections of the curved and straight lines scribe the smaller circles shown in the layout of the target. The black circles should be slightly under 1 in. in diameter with the outer circles a little larger. Use your own judgment here. CUT CLOTHSPIN TO THIS SHAPE HOLES SLA; Y Lay out your target according to the plan shown at right. Diameters are 214 in. 5 in, 8 іп., 10 in. and 12 in. Darts are made by whittling down clothespins, boring three holes in top, and insetting feathers. Set a finishing nail in the tip. Inventions for February The darts are just as easy to make. The most difficult job is whittling down the clothespins to shape given in the drawings below. In the tops of these whittled-off pieces bore three small holes slanting in- ward to give an outward pitch to the chicken feathers which are plugged into the holes. In the tip of each dart bore a small hole to take a finishing nail, which should be filed to a sharp point, so that it will stick in the target. Now about the scoreboard and scoring. Layout of the former is seen below. Scoring is done just as in a real game, with the “outs” keeping tally on the “ins.” 117

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FORTUNE c/YCAKING {deas Millions of dollars in plumbing bills will be saved by the invention of a device that will prevent breakage of pipes when the bitter cold weather sets in. Piano keys have a way of getting dirty and yellow with passage of time. What is needed to remedy this situation . issome simple chemical compound for whitening the ivories and restoring their original lustre. The market is calling for such a preparation, so get busy уси inventors. 118 Andrew Carnegie, the great steel king, once said that it is upon trifles that the great- est gifts of the Gods often hang. This is es- pecially true in the field of invention. Ofttimes it is the sim- ple ideas, such as those outlined here, that make the biggest for- tunes. Get busy— see what you can do. A simple pot stirring at- tachment for the kitchen stove will win favor with millions of housewives and bring big rewards to the fortunate inventor, ODAY is the inven- tor’s day more than it has ever been in the history of mankind. We | | need new things, new ideas, better ways of doing old chores. In- dustrial paralysis such as we have been passing through finds its defeat ultimately in new ideas, new inventions. Now is the time to invent, now is the time to reap the richest rewards. Pity those who think that times of depression are not for the inventor. They are his heydays. 1. Automatic Pot Stirrer We have many and marvelous aütomatic machines in this great day and age, and yet housewives still stand over hot stoves to stir their pots and kettles. Why not a little device that could be set to do this and per- mit the housewife to go about her other work? We have the energy in the form of heat in the stove itself and all we need is some sort of a little heat engine that will do the trick. Specifications: This problem would be impractical if solved electrically for the simple reason that stoves are hot and in- sulation is perishable. The device should be thermal and the invention should be developed with the thought in mind that nad people would want to pay over a dollar or it. Exploitation: Should be sold entirely on royalty and the inventor should ask 4% of the gross. Only Americans would appreci- ate an invention of this sort and it should be patented in United States and Canada only. 2. Anti-freeze Device Every year in the northern climates plumbers wax rich and millions of dollars are lost through freezing water pipes. It Modern Mechanix and

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or INVENTORS INSTRUCTIONS TO INVENTORS WANTING ADVICE Mr. Yates, who conducts this special department for inventors, stands always ready to give expert advice on patent law and market- ing procedure to Modern Mechanix and Inventions readers. When requesting advice, however, do not send models, as they will not be accepted. Your re- quests will be taken care of promptly and. adequately if you merely send a clear drawing and complete con- stfuctional and operating data. Stamped return en- velope must be enclosed. Address Mr. Yates in care of Modern Mechanix and Inventions, 529 So. 7th St., Minneapolis, Minn. really seems as though there would be some method of permitting ex- pansion to take place in pipes without their freez- ing. Perhaps some kind of a gadget placed in the water line would take care of the matter. At any rate I certainly do know that a mint of money could be made with the scheme. Specifications: Should not cost over fif- teen dollars and must be able to prevent pipes either from bursting after they freeze or from freezing in the first place. Exploitation: Should be patented in all northern countries and sold on a royalty in each country. 3. Making Piano Keys White I cannot help but wonder why some wise fellow has not developed a simple com- pound for whitening piano keys. I once tried to buy such a thing and found that it was not manufactured. Here is a fine op- portunity to develop a fast working mate- rial that any housewife may safely use and that may be protected with a formula patent. Specifications: Should be made to sell for twenty-five cents and enough should be placed in each can or package to permit cleaning the keys at least a dozen times. The material should not only function in connection with pure ivory keys but it should also be effective in connection with the cheap celluloid substitutes. Exploitation: This should be patented in all of the leading countries of the world and sold on royalty. 4. Automatic Postage Machine Our post offices are always closed on Sun- days and holidays. What is needed is an automatic postage machine into which we (Continued on page 140) Machines that will weigh and stamp packages or letters оп Sundays and holidays will prevent delay in handling mails for the impatient public. Inventions for February by RAYMOND F. YATES = Considerable savings in coal bills will be made by the invention of an automatic soot remover. The only operation necessary to clean the pipes should be a pull of a lever. Nothing is more attractive than a waxed floor, yet nothing is more dangerous. Won't some kind-hearted inventor get busy and develop a material which will polish the floor to a high shine, but at the same time leave a non-skid surface, which won't be a menace to everyone. 119

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FOLD FLANGES OVER FLAPAND SOLDER Photo shows attractive type bracket to go with the picturesque lamp. In finishing, give the metal two coats of antique bronze paint, allow to dry, then dab little green. Atrightarepatterns. А PAIR of lamps of the old-fashioned lan- tern type like the one pictured above makes a practical and attractive fixture to grace the mantel of an open fireplace, or to serve as a night light in a bedroom or hall- way. If, however, you are on the lookout for a scheme to earn some extra cash, here is just the thing, for any man proud of his home will welcome such an ornamental and attractive little fixture. Construction is quite simple. First of all draw the three patterns for the top, the body and the base on a sheet of cardboard according to the designs shown above. These can then serve as templates for any number of lamps you can turn out in your workshop. Place these templates on a smooth sheet of galvanized iron and outline al the parts on the metal with a pencil. Then with a pair of tin snips cut out all the metal parts, closely following the out- lines. Fold Patterns on Dotted Lines Now take up the body. With a strong pair of pliers and a vise, fold the sections on the dotted lines towards each other so as to resemble a square tube. Bend the nar- row flange on the end inward and solder to the other end. Do likewise with thé top. Fold the four sections on the dotted lines and solder the flange to the underside of the other edge. The base is also bent up on 120 with Antique L.antern E: = И FOLD INSIDE TO CLAMP FLANGES OF BODY WIRES TO V ^ WINDOWS NO.I2 COPPER the dotted lines. Note that two of the flaps have slots, which are to take the flaps on the bottom of the body. The four pointed corners are then given a graceful curve by ep them over a piece of pipe or iron rod. Now for the assembly. At the upper part of the body are four flanges which are bent outward on the dotted lines until they match the angle of the roof. The small tabs in the center of each flange are bent to the inside and serve to hold the glass in place. Those tabs and the small end of the body are also bent in wards, except the two which are slit in half. One half of these is bent inwards, the other half being bent at right angles on the outside to enter the slot in the base. Guards Made From Copper Wire The guards over the lamp are made from copper wire, soldered in the positions shown. Cut the pointed tip off the top and solder into the hole a brass ring of the type used in sockets of drop lights. Four pieces of stained amber glass are fitted into the lamp and are held by the tabs. Finally screw a miniature keyless socket on the threaded shank of the brass ring and insert a bulb. ; The lamp is finished with two coats of antique bronze, allowed to dry, then dabbed with paint to simulate oxidation. Modern Mechanix and

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"Power eMOWER Cleans Snow Off ‘Rink The motorized scraper ready for action. Note that the blades are weighted down with stones to hold the cutting edge firmly against the ice. The mower knives should be thrown out of gear to relieve the load. N DENVER, Colorado, the Park Depart- ment has devised a method of clearing the snow from ice skating rinks with the aid of a small power lawn mower. A weighted scraper is attached to the front of the mower, which is driven over the ice under its own power. The revolving knives of the mower are thrown out of gear so as not to impose addi- tional load. A mower equipped in this man- ner will clear away the snow in about one- tenth the time required when hand scrap- ers are used. You can make and attach the scraper to almost any standard type power mower quite easily. Make the body of the scraper from an oak board 14%”x10"x4’. You can make the blade of a piece of steel !4"x4"x4'. File a scissor type sharp edge on the blade and attach it to the board with several wood screws. The blade should be curved out- ward. Attach the scraper to the mower with the braces and attaching angles shown in the drawing. The lengths of the main angles wil depend on the type mower which you will use. One of these must be shorter than the other so that the scraper will set at an angle of about 30 degrees to the face of the mower. When the machine is ready for use, place А 2" x 2" GALV. STEEL ATTACHING ANGLE Drawing at top shows construction of scraper. Length of attaching angles should be such that the blades are set at an angle of about 30 degrees to the face of mower as shown in lower photo. Put a scissor edge on the scraper. enough weights in the form of large stones or pieces of iron across the main angles to hold the blade down against the ice. Start the motor and, beginning at the center of the space to be cleared, run in over-lapping circles so as to push the snow away from the center and towards the edges as each circle is completed. When the snowfall has been unusually heavy, it may be necessary to cart away a part of the snow, as the scraper piles it up in heaps too large to be pushed aside with the mower. New Winter Sport—Coasting on Snow Skates: Пе» the latest winter sport contrivance—a pair of snowskates that will permit you to dash about over the hard surface of frozen snow just like you zip around over a sheet of ice on a lake. First you'll have to be willing to sacrifice your skates, since they have to be bolted to a pair of runners as illustrated in the accompanying drawing. These runners are simply two pieces of hard wood, two inches wide and fifteen inches long, shaped as illustrated. А groove one-eighth inch deep runs along the underside. When the shaping is completed the runners are secured to the skates with metal straps bent over the runner and fastened down with two screws. If you wish you can make the runners slightly longer so they will act as a pair of skis.—Bob Paulson. Shape the runners as shown here and attach to the skate with metal straps. Inventions for February 121

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“ALL SORTS"—an ALL- This is a he man's boat suitable for any kind of service—row it, power it with an outboard, sail it, or adapt it to iceboat service with its clever fitments. “АП Sorts” is in keeping with the times—she gives you more for your money. OME years ago I built a little boat that was quite dandy for use as a dinghy. She was a combination sailer, rowboat, or ten- der. Being portable she could be thrown onto any old pair of wheels and be trekked to parts unknown for high adventure. As I used her I found that this point could be improved, and that point, and so I re- solved one afternoon while sailing on Otter- tail Lake in Minnesota to “git behind th’ new project an' shove." So I did. The resulting design is shown right here. Her name is “All Sorts.” This final evolution is a grand little boat. She is ten feet long, and 44 inches beam— very generous width for a boat so small. She will weigh less than 60 Ibs. and is there- fore portable. Because of her construction, which is typical of the Long Island long- shore boats, she is very very rigid and stiff and will take a lot of jumping and knocking about on a cross country trek. Her materi- als will cost about $15 for lumber and about $5.00 forbrass screws :) andother “АП Sorts’ as an iceboat. а it sailboat can be adapted into a really fast iceboat in which one man can ride. 122 With a minimum of extra gear this fine little hardware. The sail can be had here for ten bucks if you want to buy a brand new one from the magazine, and the iceboat attach- ment will cost according to the going wages for local blacksmithing in your community. “All Sorts” Iays her chief claim to fame in her versatility. She is at once a portable fishing and rowing skiff, or an excitingly capable little sailboat, or an outboard, or an iceboat. 2 Here is how she was built. After the idea was reduced to drawing form, I decided to build one of these little critters to see how she'd work out. At the Mechanical Package Magazine Experiment Station Sam Wing and Maurie Lonn were equipped for a job like this, and I asked my brother editor, Don Cooley, who runs this yere M-M book, if he didn't think he'd like to build up “АП Sorts" to show his readers just what a swell little boat could be used for. He did. So we started work. The lines were laid down full size on brown wrapping paper. In other words the drawing of the sheer profile and the half . breadth plan were laid out from the table of offsets. By this means the drawing was repro- duced the size of the boat. The offsets table, let me explain, is no mystery. It is a tabu- lation of the dimensions of the frames done in simplified style. Thus it avoids a lot of confusion of dimensions crossing and re- crossing one another. For instance, you can see where the base- line is laid out on the profile drawing on page 124. Six inches above this is the water line. Then six inches above this is water line No. 1. The dimensions for the curve of the stem are shown. The stations are 24" apart. On each of these stations there is a height. For instance the height of the sheer line at station No. 1 reads 1-8-4 on the offsets table. This means that the dot through which the sheer line must pass on station 1 is 1 ft. 8 ins. and 4/8" (or %” in other words) from the base- line. At station 2, the height of the Sheer above the baseline is 1-5-5, or 1 ft., 5 ins. and 5/8" as all dimensions in the table are ft.—ins.—S8ths. By following out this reading of the offsets table the full size set of lines is laid down. These lines must be laid down. One cannot build a fair boat without the full size line drawings. Modern Mechanix and

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"PURPOSE SBOAT The inset shows "All Sorts’? as a plain tender or dinghy. As such she'll make a portable little rowboat or fishing boat. Left center shows her with two aboard sailing on The Lake of the Isles, Minneapolis. She furnishes splendid sailing. One word of explanation: If the batten you use to draw around will not bend through each point given in the offset table fairly, average the lineup—fair it up —the offset table can be and very often is wrong. The whole purpose of the laying out is to fair the boat up on your own floor before you use the full size drawing for patterns for the molds and for the stem. Stem Is Next When the lines are laid out, cut out the stem just as we did. This is a piece of 174" thick white oak. A piece 1%” by 8" by 2' will give a piece for the stem. Lay this piece under the lines drawing and drive brads through the stem profile. Then pull the brads out. This will show a pattern of nail holes which can be sawed to shape on a bandsaw, or by hand. Then cut in a rabbet, just as we did, by making a fid as it is called, just the thick- ness of the topside planking of the boat, and setting it into the wood at the right angle, the depth equal to the thickness of the planking. Next, as shown in Fig. 1, arrange a Inventions for February by WESTON FARMER The author at the left and Hudson Keith, of the Packmag Experiment Station, launch the boat at the door of the Sta- tion. Just like dunking a doughnut! strongback of 2x12" scrap lumber which is fairly straight. Space off the stations, and make temporary molds from the lines drawings of the sections. It is around these molds that the planking is bent. The thickness of the planking, %”, must be subtracted all around the mold, as the drawing is to the outside of the hull. Then your setup will look like the photo, Fig. 2. The transom is made of 94" mahogany or oak, well cleated together and fastened ‘123

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Lines and Offsets Show Hull; Details Show Iceboat Appurtenances M aay es TORR Sagan ir 24" a рди 24" | WL.6" ABOVE. Bopy AS RTS" LOAD WL. BASELINE BOTTOM OF SKEGT" 3 2 | HEIGHTS ABOVE BASELINE | WIDTHS FROM CENTER LINE] STATION | t 2 3 4 5 I 2 3 SHEER _|I-8-4 |1-5-5 |1-4-4 1-4-7 |l-6-4|i-2-4 1-8-6|-10-0 t PLANK _|t-2-3 |0-1-410-11-0!0-1-6|-2-0 W.L.6"_|I-O-9 |1-0-01-0-0 [1-0-0 |I-O-O/0-II-5 |I-6-4 |I-8-7 |I-6- СМ. |0-6-0/0-6-0/0-6-0/0-6-00-6-0/0-8-0 |I-4-0 |I-7-0 | BASELINE СНІМЕ_ 0-4-4 |0-3-710-4-4 |0-5-6]0-7-5[0-6-5/1-2-5|1-6-2 |- BASELINE. SECTIONS FORWARD OF STATION No.3 NOTE: - DIMENSIONS ARE IN FEET INCHES AND EIGHTS ALL DIMENSIONS ARE TO OUTSIDE OF PLANKING 3 SECTIONS AFT OF STATION No. 3. 4 | аа шымше a ысыса TRUNK SIDES SIDE PLANKS E CEDAR 9-0". BOTTOM PLANK. a Т де Ix SPRUCE. ! a ere 25 2"X|2'" ==" TOP PLANK SX" LONG BOLTS =, RUB STRIP ee STATION No.2 —€— BEARING BOLT STATION No.4. AND WASHER ARCH. ABOUT zT 219" LONG ; x BOLTS SLED RUNNER SCREW FOR THE RUNNER PLANK 2"XI2" WOOD CHUCK BLOCKS 15x З"х!5" lx2"x4" STEEL BEARING PLATE FOR BOLT 5 х8" STEEL PLATE TIE ASSEMBLY FOR SECURING 3 o BX6' LONG RUNNER PLANK — SECTION THRU TILLER TRANSOM ATTACHMENT FITTINGS CROSS SECTION THRU ZWOAK KNEE — CENTER OF BOAT... CENTER BOARD 15 REMOVED -FIT WOOD MEMBERS BETWEEN TIE BOLTS RUNNER SHOE, $ BREAST HOOK OF WHITE OAK A STEM 2" OAK 3'WIDE GWL: STEERING Y ; ASSEMBL & WOAK SKEG 124 MAST STEP Хэ xio"wo. Modern Mechanix and

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with 1" No. 7 brass screws. I suggest %” by 2" cleats running around the edge of the'transom, and the above fastenings used. Chine Piece Is Next Next you will bend in the 94" by 1 135" w. oak chine piece. This is screwed to the stem which has previously set in between the members of the strongback. The chines are fastened both at the same time with 1%” No. 8 brass screws, well countersunk. Then the pieces are sprung back around the molds which have a 34"x1?4" notch cut in them at the proper bevel to let the chine pieces in. The chines are set into the cleats on the transom. If you find the wood will bend easier toward the bow, you can taper the pieces the flat way down to %” thickness. Then the side planking goes on. The larger pieces at the bottom go on first, [реп ШР top or sheer strakes, as they are called. Along the chine at 2" intervals the bot- tom planking is fastened with 94" No. 7 brass screws. The seam here should be payed with C quality Jeffery's marine glue from an or- dinary oil can. Just a thread should be payed out between the surfaces as the plank is screwed home. The glue will first spread of its own accord and then will dry in a rubbery plastic state which will keep all water out. This treatment is necessary in a small boat which is in and out of the water a lot. Where the top and bottom strakes of planking lap, especially amidship, it will be well to bevel the bottom strake a little so that the seam is flush when the top strake is fastened on. The top strake is screwed at the frame with 94" screws, and between frames it | is fastened with copper covered clout nails 1%” long. These can be had at or through your local hardware store. If they haven't them in stock they can get them for you. Plane off the planking flush with the chine piece and then you are ready for the bottom. These are pieces of spruce !2"x4" in width. Spruce or cypress is the only wood to use here. Pine is too soft and will pull the fastenings. The planking is started at the bow, and worked aft. See Fig. 3. There is about 1/16" opening or outgauge left in the seams of the bottom planks and the seam is payed with a bead of Jeffery's C Quality marine glue. After sanding, the boat is taken off the molds and looks as shown at Fig. 4. Next the trim such as gunwale, oarlock pads, centerboard trunk (see Fig. 5 and Fig. 6) are put in. The gunwale is riveted with No. 10 copper rivets over burrs. At this stage the boat, ready for the mast rud- der or iceboat attachments, looks like draw- ing on page 124. Inventions for February Fig. 1. Showing how stem and the molds are set up on a strongback after the molds have been made from the full sized lines drawing you make from the table of offsets. Fig. 2. The strongback is lowered to the floor. Chine pieces put around the molds and fastened to the transom. Then the bottom strake of planking is bent around and cut to shape, later being fastened. Fig. 3. How “All Sorts’ looks when the topsides have been planked and the bottom is laid on athwartship, or “crosswise” as landlubbers say. The center board is 30”: long by 11" wide by %” thick oak. In order to keep it sunk and in order to prevent it creep- ing. up into the trunk while sailing, you shduld pour lead into a recess as the draw- 125

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Fig. 4. The job has been sanded. The molds are knocked out. Here boat is being turned to light ready for operation. ing in Fig. 6 so clearly explains. . The sail plan and all details of the sail- ing equipment are shown in that drawing. The sail of 6 oz. canvas is something that better be bought. Of course, if you want to build it yourself there is nothing that will prevent you from doing it, but it will look like sin and will not have the proper draft. Sailmaking is an art, no less. We can furnish this sail with all bolt ropes and the lacings for ten dollars. Not that we want to make a business of this sort of thing, but in times past we have had readers write in and be very disappointed with the results of their home-made sails, so we arranged with a well known sail- maker to handle the jobs and turn out the canvas for this figure. If you try to make a sail at home here's what will happen. You will lay out the sail, cut the cloth, and like as not, without some article to help you place the selvages and the warps in the correct slant, the sail will sew up unevenly, and when the first tug of wind hits it it will pull unmercifully far out of shape. А six-ounce sail, which means that the cloth weighs six ounces to the yard, will be a hard thing to sew up straight, too. Never yet saw an amateur sewn sail that was a credit. The idea that most anything that draws wind will sail is correct. The idea that most anything that will draw wind will sail well is not correct. A few bumps, a few unevennesses in the surface, and gone is the pulling power of the sheet. Better let George do it and in- vest the price of a sail. This is not drumming—we make not a penny on the deal, but it is an earnest desire on our part to see the reader with a perfectly fitting suit of sails—and at prices that a year ago would have cost thirty dollars. The same line of thought holds true of the matter of the bronze fittings used for the iceboat and the rudder fittings used for the sailboat. We can furnish the stuff here for about three dollars per set, and wish if you are building the boat that you'd ad- dress Sam Wing, 529 So. 7th St., Fig. 5. Station. Fitting in the centerboard and mast step at the Experiment Note the use of C-clamps while setting down the brass screws. for a quotation. It only costs a stamp. Here is "All Sorts,” right out of the shop. She in her simplest form is a good rowboat. Her simplicity and sturdi- ness are evident in this photo. 126 We can furnish bronze fittings if you want 'em. ] Modern Mechanix and

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To add any explanation would be to gild the lily. All the running rigging should be 3$" manila rope. The mast is stepped without stays, as it is a small stiff stick, and the arrangement described in the plans have proven very strong. The iceboat details are shown in full explanation in the drawing on page 124 and show more clearly than words could just how the rear runner is attached in place of the rudder and how the cross beam is centered by a spud which fits into the centerboard trunk and a 2" 12^" sugar pine top plank to hold the tie rod bolts that go into the runner plank. Ice boat shoe details have been run so often in MODERN MECHANIX AND INVENTIONS that no further explanation is needed. T = TAIL — Mast HEAD De А m MAST BAND TILLER DETAILS OF RUDDER» USE THE SAME FITTINGS AS ON STEERING TILLER fei MUR um BOOM әс Y YELLOW py PINE DETAIL OF Boom_ YOKE COMPLETE ASSEMBLY 9F — ALL SORT: MAST SEAT ces A small one or two cylinder motor of the A class will prove ample outboard power as a kicker for “All Sorts.” Any kind of a pond is big enough to sail her on, as witness the pix of this little hooker as a sailboat. She will prove a fine dol- lar’s worth for anybody, and the step by step pictures, with the complete drawing; and outline of building procedure, should enable anyone with a little lumber, elbow grease and stick-to-it-iveness to build him- self a boat that can do anything—an “АП Sorts.” Before you sit down to write concerning any point which. | is obscure to you in the building А of this boat, think first. There | was no wood burning in this office | for anyone to smell while we were doping out the plans, and a lot of needless work is often Ц caused by thoughtlessness. О TOP О = DECK Т‹ MAST 14-0" YELLOW PINE _ Fig. -6. The layout and the sail plan for “АП Sorts.” АП details of the sailing rig аге shown, and Johany конус; Staff artist, has shown the varied uses to which this boat is well adapted. Inventions for February 127

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“Home-eNMade ‘Press Extracts тий Juice ге ——3г%' т ili Vx d WOOD STRIPS IUM-WEIGHT ALV. IRON STRIP WOOD STRIPS -Ý | | ! TA Construction details for parts of the fruit juice press are given in the drawings above. Keep in mind that the frame should be exceedingly sturdy and securely nailed in order to withstand the excessive pressure from the auto jack. LL that is needed for -the construction of this fruit juice press is two strips of medium-weight galvanized iron, an old Ford automobile jack, a supply of lumber and some nails. Shape twenty-one strips of wood to di- mensions shown in diagram above. Lay them side by side on a flat surface. 4%” from one end of each of the iron strips, on the center line of the strip, make a small hole with a sharp center punch. With a 94" nail, fasten the iron strips to the first wood strip at 1%” from each end of the latter. Continue this process until all but three of the wood strips are fas- tened to the iron strips, leaving a space of 1 11/32" between center punches. Assembling the Slotted Cylinder Punch the remaining holes (at the right end) and fasten the last three wood strips at the points where these holes have been made by lapping the iron strips and nail- ing through both thicknesses of the metal, which then forms a slotted cylinder. Make a frame or yoke using 2"x4" board as shown on right of photo. Be sure to nail it securely. Next take a 1" board 12"x18" and nail a thin strip along the two sides and one end to prevent the juice from running over the sides. Then saw a circle exactly 7" in diameter from a 2" 128 Ps “Toe ЧҮ OLD FORD | AUTO JACK “inte 1” BOARD 127X198% Sp Wi) board. It should fit snugly into the slotted cylinder but loose enough to allow it to slide up and down. Nail the pan affair securely to the frame allowing the end with the strip to extend about 6" beyond. Set the slotted cylinder in place with the center directly below the center of the frame. How to Operate the Fruit Press The device is now ready to operate. Put the fruit to be pressed in the cylin- der, fit the circular board into the top and set the auto jack (screwed down as far as possible) on top of the circular board. Now by operating the jack as in raising a car, the circular board is forced down into the cylinder and the juice runs out through the slots, onto the bottom board from which it flows into the pan. A bag made of burlap to fit the interior of the cylinder may be used to hold the fruit and will make the extracted juice much clearer. After the parts of the press have been cut to size and before putting them to- gether, it is well to give all members that come in contact with the juice a coat of shellac or varnish to prevent them from absorbing the juice and for greater ease in cleaning.—M. M. Glauber. Modern Mechanix and

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SLED STOVE for SKATING PARTIES у Suse AND SUPPORT DEMOUNTABLE (EA in A |3 -——— SHEET IRON WOOD STOVE When bitter cold weather comes around, this sled stove will keep you plenty warm and prevent frostbite. An ordinary air tight stove is mounted on the sled just behind the wood bin, OU skating fans who suffer from cold | hands and feet in bitter cold weather, when your sport is best, will perceive in- stantly the service this *sled-stove can do you. It can be transported anywhere, and will be well worth whatever effort you may put into it. In the sled shown, an ordinary air-tight stove was used, the legs of which were re- moved. On the inside a three-inch layer of sand is put down for insulation purposes. The stove was then mounted on a bob-sled which measured seven feet long and fifty- eight inches wide. This arrangement per- mits the stove to be hooked on the back of a car and hauled to any desired point. Notice in the drawings that a rack is built in the front of the stove for the fuel Skis permit transportation behind an auto to any lake near by. supply, sheet iron being used to insulate the framework. The stove pipe—two lengths— was riveted together and fastened to a wooden post, the whole attachment being readily removable to aid in moving. Ski runners made from oak barrel staves made the sled serviceable in loose and un- packed snow. When you have set the sled out at its location proceed then to cut a good supply of logs and you will suffer from frost-bitten hands and toes no longer. In building an open fire, it will be much more enjoyable if you choose an overhang- ing ledge as a site, giving a sort of fireplace effect, and protecting against uncomfort- able winds if you choose the leeward side. This portable stove, of course, makes you independent of weather conditions. Kitchen Chair Mounted on Runners Makes Sled for Ice Racing Thrills OU haven't exhausted all the possibilities of sled con- struction till you've made this little gadget. It’s noth- ing more than a chair mounted on a pair of runners, but the fun it provides is endless. First lay hands on a pair of old sled runners and secure to them, in the posi- tion shown, the strap iron braces. To these are bolte:! the chair, which may be of the kitchen variety. On the stern of the runners nail a pair of blocks. This permits the ice gondolier to do a little riding himself when he gets tired of pushing you around. It will be a good idea to brace the chair firmly with wires, since it has to take an excessive amount of punishment. It is best to use as heavy an old chair as possible, and the bracing wires can be tightened by a tourniquet arrangement for twist- ing them together. The bracing principle is the same as "that of airplane wings.—Chet Sullivan. Inventions for February The chair is secured to the sled run- ners by means of the strips of strap iron. 129

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Non-sinkable Duck Blind Adjustable to Various Elevations The non-sinkable duck blind, shown above, is adjustable to various elevations above the surface of the water. When in actual use, it is camouflaged with leaves and brush in the conventional manner to fool the cautious ducks. Self-applying Bandage for Cuts I HAS always been quite a task to ban- dage your own finger when cut and usually requires the help of another per- son. А self-applying bandage now on the market has been designed to over- come this incon- venience. To ap- ply the new ban- dage all you have to do is cut the gauze to fit the finger and pinch it together, as demonstrated in the two photos at left. Adhesive qualities are in- corporated with- in the gauze па the ban- dage firmly in place as long as desired. This new medical aid is especially val- uable for camp- ers, households and the autoist. Self-applying bandage contains adhesive qualities permitting one petson to patch a cut finger. Precautions Against Child T. B. "[HEEE chief precautions against tuber- culosis in children are suggested in a recent report to the Medical Research Council of Great Britain by a doctor of Glasgow, Scotland. One is to keep chil- dren away from infected adults. The sec-- ond is to use only boiled cows’ milk or milk known to be from cows which are not tubercular. The third is to keep as clean as possible the floor and other parts of rooms where children live. 130 HE non-sinkable duck blind seen in photo at left is the latest development in the sport of waterfowl shooting. The blind is adjustable for various elevations above the surface of the water. Circular in shape, it has two pontoon arrangements for stability. . The device will comfortably hold two men without crowding. In actual use, the blind is camouflaged with. leaves and brush in the conventional manner to fool the cautious ducks. Tests have proven sat- isfactory in every instance and when dem- .onstrated before several noted sportsmen, they praised it highly. Bed Compass Locates North Pole CIENTISTS have recently advanced the theory that sleeping is bet- ter accomplished with the head pointing north. With this view in mind, an en- terprising furni- ture maker de- vised the com- pass bed shown in accompan y- ing photo. The compass is placed in rail. Compass is set in bed rail, as shown, to enable sleepers to re- cline with head pointing north. Magnet Removes Metal From Body N ELECTRO-MAGNET claimed to be the strongest of its kind in the United States has been installed in the University Medical School of St. Louis, Missouri. The magnet, demonstrated in photo below, weighs one and one-half tons. It is used to remove bits of metal from the bodies of patients, particularly from the eyes. This huge electro-magnet weighs one and one-half tons and is the largest of its type in the United States. . It is used to remove bits of metal from bodies of patients. Modern Mechanix: and

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New Cireular Saw Astonishes Woodworkers New Table Extension gives enormous са- Pacity for ripping wide panels . . . at sur- prisingly little extra cost. (Illustration shows portion of extension bars cut away.) /' New Self-Allgning “Double Locked” Rip Gauge. At last — ample room IN FRONT of saw blade — where It 15 needed. New Miter Gauge Clamp — very convenlent. New “Micro” Setting Device » » . accurate and convenient, Automatic Stops for square and mitre Positions. (Pat. Pend.) Scores of New Features Radically New Design ESIGNED completely new from the ground up, this latest 1933 “Delta” Saw has every feature that woodworkers have wanted for years— and yet it is so moderately priced as to be within the reach of all. It offers extra space in front of the saw blade, where it is most. needed, plus all the advantages of a table 4 feet square, at a fraction of the ordinary cost of a large table. It incorporates scores of important improvements and exclusive fea- tures. With a choice of designs available, “Delta” engi- neers, after thorough tests on all types of work, and under all conditions, selected the TILTING TABLE design (no tilting arbor) as being the most efficient and prac- tical. For full details see the new 1933 “Delta” Catalog, 10-DAY TRIAL ЕЛ5 TERMS New, Accurate Tiit- Ing Mechanism. Graduated Raising and Lowerlng Scale. Improved Ralsing and Lowerlng Mechanism — one turn equals 1/16 Inch. A Complete Line of “Delta” Motor-Driven Tools The “Delta” line includes Inventions Jointers, Circular Saws, Band Saws, Woodturning Lathes, Drill Presses, Scroll Saws, Boring, Routing, Sanding, and Mortising Attachments, and a complete line of ac- Cessories. Catalog FREE It is packed full of interesting illustrations апа descriptions. It describes the latest developments in motor driven, equipment at the astonishingly low prica levels. Mail the coupon TODAY for your FREE copy. , for February % Ss Because “Delta” Woodworking Tools are efficient and prac- tical under actual working conditions, they are always arail- able for а 10-Day Trial without the slightest risk. Satisfaction is guaranteed. For full details of this liberal offer and alsa of "Delia" Easy Payment Plans, fill in and mail the con- venient coupon below, TODAY! DELTA MFA. CO., 3776 North Holton Street Dept. M233, Milwaukee, Wis. gum m m na m m рма пи RU B ши ши шын UNE шш шш ма DT RUN UN RE D e Delta Mfg. Co., 3775 North Holton Street Dept. M233, Milwaukee, Wisconsin І Please place me, without obligation, on mailing list to |i Teceive the FREE 1933 “Delta” Catalog of Quality J Woodworking Tools, Also send full details of your 10- Day Trial Offer and Easy Payment Plans. - [| Address. [oin EE резот лани m m шш n Rn RR A [3 H Ф pe- 131

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A FREE BOOK Develop your personal, creativo power! Awaken the silent sleeping forces in your own conscious- / ness. Become Master of your own life. Push aside V S all obstacles with a new energy you have over- | looked. The ROSICRUCIANS know how, and will | help you apply the greatest of all powers in man's control, Create health and abundance for yourself. Write for FREE book, "The Wisdom of the Sages”. It fells how you may receive these teachings for study and use. H means the dawn of а new day for you. Address, _ Scribe V, Н. 5, 7 | ROSICRUCIAN BROTHERHOOD | San Jose [AMORC] California l | | Earn Money casting our new hollow Toy i Soldiers, Indians, 5 and 10е Automobiles, Ashtrays, etc., lor a firm of many years standing. NO EXPERIENCE required as we furnish full instructions with moulds | || and buy finished goods. А rare opportunity ^ efi. for these times, so if you mean strictly busi- ness write at once for full details as 1933 Wholesale Season is Now Starting. ] METAL CAST PRODUCTS CO. 1696 Boston Road, New York DO YOU WANT TO. LE Banish the craving for tobacco as thousandsheve. Make yourself fres and happy with Tobacco Redeemer, Nota enbstitute, not babit forming. Write for free booklet telling of in- juriouseffeetof tobaecoand depend- &ble, easy way to relieve, thecraving many men have. Newell Pharmacal Co Dept. 867, Clayton, Mo. W LOW PRICES опе Goodrich fires о THER TIR h ‘Actualtests onroughest roads 1 rove that standard brand tires recon- 8 structed by the scientific Midland process deliver |j BOto60 % moreservice. Ordertoday,savemoney Reg. CORD Tire3 Size Tires Tubes 30х3 $2.20 $0.80 30x335 2.25 .85 2.95 BALLOON TIRES | Size Rim Tires Tubes 2.30 $0.95 2:40' :95 DODOA A. 81х4 82х4 88х4 К 82x434 3.20 88х4% 3.20 34х45 3.45 3.60 "e .25-18 29x5.25-19; | 80x5.25-20 81x5.25-21' B 28хр.50-18' 29x5. S0x6. озсо сооко. ALLTUBES NEW GUARANTEED .55 Order 2 Tires . .35 Get Guaranteeds 3.50 1.65 Tube FREE Send$1.00Depositwith each tire ordered. ў | Balance C. О. D. If you send cash in full de- duct 5%.You are guaranteed a year’s serve | ice or replacement at #2 price. MIDLAND TIRE & RUBBER CO., Dept. 2723 1000-10 West Sixty-Third Street, Chicago, Minois OSSOMMAASSSSN оо 250! OOSOSOSOUIUINIUIO MIE ИИТИИ ©: WUWWOWWRRNVNNNN! ET 132 How Much to Spend for New Home (Continued from page 114) Plan No. 3-G-57 is another of those popular garage houses which are proving life savers for many whose income has been sliced to almost the breaking point. The house is Colonial style. The lower floor accommodates either two cars, or one car with half the floor space as a sleeping room. Above is а compact kitchenette apartment with combi- nation living and dining room. There is one bed- room, a complete bathroom, kitchenette and a closet sufficiently large to accommodate a closet bed which provides a second bedroom service so that four people can be comfortably accommo- dated in this extremely small floor area. A feature of the house is the balcony stretching across the ront. The house is planned to be built at the rear of a lot and for this reason should appeal to many lot owners who are not yet reddy to build a large house. The house may be built of frame, or hollow tile or even of brick. In frame, with stucco exterior, it should not cost over $2500, perhaps less, con- sidering present prices. You may omit the fire- place if you wish, but this feature is desirable and is recommended for comfort. | Both houses this month fit present day incomes and at the same time provide a large degree of comfort at small cost. Hope you like them. Now is the time to build, or at least contract for your house, when prices are lower than they will be for a long time to come. SOMETHING NEW— DIFFERENT — BIGGER A real scale model Graf Zeppelin, 5 feet long, of metallized Paper-fiber; includes cabin, whirling props, ete. No spe- elal tools or skill needed. Be the first with this wonderful mode! dirigible. Complete kit (full directions) ONLY $1.50 postage free. Also completakit 4-motored junker plane for $1. BILDON CO. 703 Wenonah Ave., OAK PARK, ILL. NO JOKE TO BE DEAF = EVERY DEAF PERSON KNOWS THAT George Р. Way made himself hear, after belng deal for 25 years, with Artificial Ear Drums j —his own invention. He wore them Э дау and night. They stopped head 7 noises and ringing ears. They are : invisibleand perfectly comfortable. No one sees them, Write for his true story, “How I Got Deaf and Avtifici Made Myself Henr," Also boop- vtificial let on Deafness. Address Ear Drum GEO. P. WAY, In 1 Hofmann Building, Detroit, M S Regardless of strength or size de- $4 fend yourself and friends against $ any foul attack, from bullles or by 3. gun, knife or club. Subdue with ease% persons much stronger than yourself. A complete course on approved American Police Jiu-Jitsu by Internationally known police instruc- tor. 151 illustrations with detalled instructions Pocket size. 14 knockout blows without using fists. Send One Dollar Full Price, or will send C.O. D. S. J. JORGENSEN 701 Maritime Building Seattle, Washington aes Thank You for Mentioning Modern Mechanix and I nventions jor February When Writing to Advertisers

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2 Thread culting lathe and Counlershaft $35.00, use lever in gearbox to shift carriage while cutting thread: 12’’ Band Saw with tilting table $25.00. Send for Catalogue on these and other machines. ROSSBACHER MACHINE CO. 1516B Fernwood Ave. Toledo, Ohio Jum with new mai invention 1... D that lights gas instantly without sparks or flame. A sure sale where- ever gas Js used. Retails for 25c. . ANS INS TERY GAS LIGHTER | Gol [n on this s Packedon Individual carde with Instructions. $9 per gross or $1 per dozen. BIG MONEY ample 10е. Rush $9 MAKER --- NEW METHOD MANUFACTURING CO. ACT NOW New Methed Bldg., Desk MG-2, BRADFORD, PA. Master Home Mike New 1933 Model, Complete with Mike Ring and Handle "Reproduces your own voice / through your radio. Fools your e friends. A million dollars’ worth of fun. Easy to connect. Fits any radio. А real microphone—not в toy. ¢ Malled postpaid, only 95c. Sendtoday. & POSTPAID : 4810 Grand River, Detroit, Mich. /2 MASTER MIKE CO., SILVERY WHITE PLATING POWDER Plates Iron, Steel, Nickel, Copper and Brass without electricity. Dispenses with polishing. Half pint can $1.50 prepaid. Free particulars. GUNMETAL СО. Ave. S, Decatur, 111. Dirt Track Racing Now you can break into the racing game. How to build your racer, V contest rules, supercharges, bal. | ance, speed, “revs,” compression ratios—a complete racing treatise illustrated. Postpaid $1. Madisonville, Cincinnati, Ohio. NEW CATALOG 16 For Boilers, Gas, Steam Engines, Cast- ings for 40 kinds of these Engines. Pumps, etc., Electric and Water Mo- tors, Gears,. Material, Piston Rings. Blue Prints free with Castings. Send 25е for Catalog 16. Refund оп lst order. HOWARD ENGINE & MEG. CO. RAY KUNS, Dept. A, 2417 N. Ashland Ave. ы NE S. LL Сш a DP Illinois I] A^ PrintYourOwnlE | Cards, Stationery, Advertising. labels, paper, circulars, ta: LE etc. Save money and time. Sold direct from factory only. Junior Prose $5.90, Job Press. $11, Power$149. 5 Do popular raised printing like en- graving with any of our presses Print for Others, Big Profits Pays for itself in a short time. Easy rules sent. Write for free sa catalog of outfits and all details EXCELSIOR The Kelsey 20., K-9, Meriden, Conn. socii Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers “It’s Cheaper to Get . a | High School Education Than to Get Along Without It High School training is essential to success in any kind of work or activity. It gives you a good general education— prepares you to enter college or engineer- ing school—forms the basis for specialized training in your chosen line. building and manufacturing is based on High School training. In the Professions: Doctors, lawyers, C. P. A.'s, etc., must have highly technical training, for which High School work is the foundation. In Teaching: Practically all states now require teachers of any grade to have at least a High School education. In College: All colleges require complete High School training for entrance, and base their instruction on High School work. In Social Life: А High School education assures correct speech and gives a general S knowledge of many subjeets. In Public Activities: The ability to think quickly, write correctly, and talk con- vincingly results from High School training. U. S. Government statistics show that a High School graduate earns $847 а year more than a Grade School graduate—or $33,880 during his work- ing life. That’s why it’s cheaper to get a High School education than to get along without it! If you can’t finish your High School training by resident study, we can give you equivalent train- ing by home study in about two years. We use standard texts and guarantee college entrance. Like the best resident colleges, our School is chartered as an educational institution, not for profit. Established 35 years. Thousands of successful graduates. А Let us show you how to get on the road to success, It will cost you nothing butastamp. Write today. American School Dept. H-233, Drexel Ave. at 58th St., Chicago, ш. ТНЕ UNIVERSITY OF THE HOME In Business: Many beginning jobs require High School training, and most better- paid positions are unattainable without it. In Industry: The specialized training nec- essary for advancement in engineering, (e 133

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AERO INTERNATIONAL | ALL WAVE 11-TUBE SUPER-HETERODYNE DELUXE мете! gssembled With 2 atched Full Dynamic Speakers . . . . » 309.75 At Last! World wide reception at а sane price, 15 to 550 meters. Besides the regular broadcast band it brings in foreign pro- grams, amateurs, police calls, Ships at sea and aeroplanes. One dial control. No plug in coils. Latest super-phonie tubes. AERO 4-TUBE MIDGET $10.95 less tubes 2.95 kit of tubes The lowest priced quality Midget Receiver on the market today. Very selective, brings in long dis- tance like local stations. AERO 5- TUBE MIDGET... .$11.90 AERO 6-TUBE MIDGET.... 18.50 AERO WORLD WIDE 1-Tube SHORT WAVE SET for h $5.95 . |. Operation Listen in DIRECT to London, Paris, Berlin, Buenos Aires and other broad- casting stations throughout the world via short waves. Your ordinary receiver cannot iune in these low wave stations. WORLD-WIDE RECEIVER gets 15 to 500 meters. Aero 2-Tube Short Ware Set $8.75. The same as above set but it has 1 stage of Audio Frequency added to it. Write for complete catalogue. CHARLES HOODWIN CO. 4240 Lincoln Ave. Dept. T-7 FREE STUDY GUIDE iven with the Handbook of Business Administration Chicago tells HOW TO LEARN BUSINESS MANAGEMENT Here is a new offer with big opportunities for you. Handbook of Busl- ness Administration, togelher with Study Gulde we give free, equals complete home-study course in business inanagement at striking low price. If you want to know the most direct path to security in your present job and advancement to a better one, let us send you this ‘course for 10 days’ free examination. COMPLETE GUIDE TO UP-TO-DATE BUSINESS PRACTICE HANDBOOK, 1752 pages, gives vast amount of essential information on sales, advertising, production, personnel, financial and general management. Gives knowledge of functions, principles, policies, prob- lems and methods in these departments needed by men who want to direet as well as de. Troins you to supervise, plan, control. Written by 129 specialists. Based on methods used by leading concerns today. Covers same ground as college courses. Gives meat of several textbooks, in crisp, practical, handbook style. GUIDE SIMPLIFIES STUDY OF HANDBOOK FREE STUDY GUIDE, written especially to go with Handbook, makes everything clear, lays out complete course based on it. Shows how to read the Handbnok—how to apply it to your job—how to study special divisions or whole field of business administration—how to iraln yourself in business facts that lead most surely to advancement. 10 DAYS’ FREE EXAMINATION--EASY TERMS Cost of Handbook, $7.00; Study Guide given Free. Examine both for 10 days without cost or obligation. If you decide to keep them, send only $1.00 in 10 days and $2.00 monthly for three months there- after. See what this eourse сап do for you. Send this coupon today. po mmm иш == шош шош ш эшш MeGraw-HII Book Co., Ine., 930 W. 42nd St., N.Y.C. U Send me ihe McGraw-Hill Home-Study Course in Business " E Management, postpaid, for 10 days’ free examination. I will Ш return the books within 10 days of receipt or send you $1.00 then А Ё ала $2.00 monthly until $7.00 is paid. (Books sent on approval in U . and Canada only.) m um mm кы Em яш EM Am AM Um um MM йш Nm GR ш яш ш à ин E Name. ou не e ER Ere mcr ERN -—— ——— HR x EU nA E | t City and State bi g Position азе ашшы саа данаа аана ЧЕ ЕЛШЕМД RR ы a Employer MMs.2-83 ' | sechi 134 The Long Harlequin Motor (Continued from page 113) using the two 9/16” spacers shown. Don't be afraid to tackle this pump, it is quite simple. The oil line layout is simple. The right side of the pumps is the input side. The small hole on the center line is plugged on the right side. The one on the left is used for the main pressure line and also to the pressure gauge on the dash. Look carefully at the drawings and it will all be clear. The stopcock to the rear of the rear pump regulates the pressure, which may be from 25 to 200 lbs. per sq. in. We use 80 lbs. and find it about right. There are two lines to the oil tank. The overflow fróm the rear pump is also joined by the scavenge side of the front pump. The suction line comes to the right side of the rear pump. The short line from the sump goes to the right side of front pump. Use 5/16" line all around with the usual fittings. The lifter arm arrangement is clearly shown. Take a set of regular Harley arms apart. Get a new exhaust and a new intake lifter bushing. The arms with the fork end are used on the right side of the motor. Slip the bushings in place and put the arms on the stud and cotter neatly. The left side set must have the spacers cut from tubing exactly as shown. Assemble them on the stud and cotter. Don't let them have too much play. This brings us to the final item, the manifolds. No exact measurements are given. 'The drawings are quite plain. Weld up the center part and bolt it solidly to the bottom of the gear case. Braze in the 2-inch piece in the regular Harley intake manifold nut, after sawing off the outer threaded part. Then weld on a piece that will line up with the center part, so that the pieces of hose will cover the gap neatly. This gap takes care of expansion and allows the motor to be placed on its bed by slipping the hose to one side and dropping it in place. See that about 2 inches is left between the manifold and the bed plate on the case as the motor bearer goes be- tween them. Use wire or hose clamps to keep the hose air tight. The exhaust arrangement you may do as you like with to suit your ship and cowling. We use the simple little elbow shown. We take out the regular exhaust manifold nut and slip this elbow in the manifold. It is held by a screw going through a 3/16" hole drilled near the end of the manifold cast on the cylinder and one in the elbow to match. We braze a nut inside the elbow to take the screw. This completes the job. 1t has taken a lot of words to describe it, but the actual work is really quite simple. Most of the things are per- fectly obvious as you go along, and the majority of the parts have already been made to fit. Any- one who likes tools and machinery can't help enjoy making the engine, and there is very little chance of failure in any part. If the full-size blue- prints are at hand you just can't go wrong. The timing is regular Harley. If you cut the key seat on the shaft in line with the throws most of the marks on the gears will check. How- ever, you had better get a motorcycle rider to help you time it. Only two of the binding posts on the magneto are used, of course. The other two may be grounded. Time the magneto by setting a idee Thank You for Mentioning Modern Mechanix and Inventions jor February When Writing to Advertisers

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The Long Harlequin Motor cylinder in firing position and setting the breaker So it is just cracked. Slip the magneto gear through the hole and in mesh with the cam gear and bolt the magneto down. The other cylinder will use a diagonally opposite binding post. The carburetor flange shown is for regular 11⁄4 inch. You may use any make you like, but we have found that the Winfield model M or S is by far the best for this motor. With the engine on a test stand or in the ship it should be run for an hour or so at around 1,000 rpm to loosen up. Watch the oil pressure and stop frequently to see that the cylinders are get- ting the right amount of oil. We recommend a propeller of 5 feet or 5 feet 2 inch diameter by 30-inch pitch. This depends on your ship, however. When your motor shows about 2750 with this prop you are ready to fly. We think you will agree that this engine has the most ear-splitting, convincing roar to it you ever heard. It sounds like a whole flock of army pur- suits coming. It is a real joy just to see and hear it work. If you need help don't hesitate to write us about anything, but whatever you do, don't forget that stamp. This 3-cent rate on several hundred let- ters counts up. The address is Les Long, Corne- lius, Oregon. ToAny Suit! Double the life of your coat and vest with correctly matched pants,100,000 patterns. pair hand tailored to your measure; no ES lymades.'" Our match sent FREE for yout before pants are made. Fit guaranteed. “Жы? plece of cloth or vest today. SUPERIOR MATCH PANTS COMPANY 115 $9. Dearborn Streot, Dent. 988 Chicage AT HOME You can learn by our modern and original system of instruction every part of the Watch Repalring Trade at home as good or better than at s 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 from $50 to $75 per week. For particulars apply to the MILWAUKEE ScHOOL OF WATCH REPAIRING B24 E. MASON ST., Dept. C MILWAUKEE, WIS. EARN UP TO $25 A WEEK, THIS BOOK OR MORE Grow Mushrooms in your cellar or shed, Big demand. Expe- rience unnecessaty-—we tell you how. Illustrated book free. Start NOW--writo today. AMERICAN MUSHROOM INDUSTRIES, Ltd. Dept. 439 Toronto, Ont. ë A Build this Flying Beauty! | AKRON FIGHTER F9C-2 $ 34°" scale. U. S. Navy's newest Curtiss fighter. Span 19%4’’; length 15%”; weight 2.2 oz. Colored silver, blue and black. Complete kit, SF-22, at your dealer's or direcl............ FAMOUS PLANES now available in Cleveland-Deslgned Flying Model Kits. World famous for authenticity. Send name, address and 5e for sensational CME Technical Bulietin for Cleveland Model Engineers. Don't deiay—send at once! Cleveland Model & Supply Co., 1866-LB West 57th St., Cleveland, О. m Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers CoME To $UNNY TELEVISION: RADIO TALKING PICTURES In just a few years, Radio has become one of the world's leading industries. Talking Plctures have brought new life and opportunity to the Movies. Now, Television is here with a promise of growth and activity so great that 1¢ cannot even be estimated. Come to Los Ange- les—most active Radio center in the world—and learn these fascinating Trades. You сап be one of those to reap the harvest. BUT—YOU MUST BE TRAINED Times are getting better. The worst of the depression is over. Thou- sands of new jobs will call for TRAINED MEN. Will you be ready? Regardless of the Times, the Trained man wins. He always has and he always will. Take that fact as a guide and your future is assured. Wonderful opportunities are open before you. Get the Best Training your Money will Buy Naturally, you want the best and most complete training you can secure. Analyze—Investigate. Your whole future depends upon It. For over 28 years, National has been tralning ambitious men by our own practical shop method, Our graduates are our best recommenda- PN LIFE SCHOLARSHIP insures thorough instruction You are not hurried through your courses at National. You are given а Life Scholarship when you enroll, which means that you can go just os fast, or take as long as you wish to complete your tralning. The main thing is that you master every phase of your instruction. step by step. ACTUAL EXPERIENCE on modern equipment There is no DUMMY equipment at this wonderful institution. It ts all ‘‘hooked-up,’’ ready for you to use in learning your Trade. You learn Television on actual Television Transmitting and Receiving equipment. You take part in operating our own Radio broadcasting station W6YF. In Talking Pictures, too, you learn on actual equlp- ment, right in National's Student Talkie Theatre. Earn Room and Board Spare time jobs while at school. We help you get a job to pay living expenses while learning. So 1f you are short of money, don't Jet that hinder you from enrolling. 75% of our students are earning their living expenses while attending school now. We also allow your Coach Rallroad Fare to Los Ange SPECIAL new course — RADIO BROADCAST TECHNICIAN Finest studio in West—sound-proof walls, broadcasting big programs —just like the most famous stations. 5 separate studios. Special course given without extra cost to students who enroll immediately. We broadcast over our own station and also by remote control You actually learn operating the equipment, qualifying for important technical jobs. . Ask for Details qmm , пы! i Send coupon for descriptive UPON rade Schoo literature. You owe it to your- [11 ¢ in the West self to Became rea SUL fo Г quainted with thls great school. You will nd the facilities here | 3 Est. 1905 a positive revelation. et new book, which gives you all the 25,000 facts in story and pictures— Graduates SEND COUPON AT ONCE! NATIONAL RADIO cELECTRICAL a SCHOOL: los Angeles” Dept. 23-б, 4006 So. Figueroa St., Send Book and full details of Courses. Name ........ ede cccccvens Address City sesa

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UST plug in and grind electrically. Save time on jobs where filing would take hours. Grind things that can’t be touched with a flle. Only machine of its kind on the market. Operates on А. С. or D. C., develops 10,000 R. P. M. on 110-volt, 60-cycle. Press button con- р аз you grip tool. Weighs only 1 lb. Fits the nd. Replace hand work with mechanical efficiency. Money returned if not satisfactory after 5 days’ trial. Three wheel shapes free. Order today. M. C. TOOL CO., 1228. Aberdeen St., Chicago, 111. 100 SHAPES AVAILABLE. AL Your Weak Glands Need a Good Gland Tonic Science has now found a way of supplying the body with gland secretions which certain glands often fail to produce sufficiently and which are absolutely necessary for building health, strength and vitality. You can have free proof. Send for our wonderful GLAND TONIC—GOLDGLAN—and Try It 20 Days—FREE This Lo treatment has brought pep and strength to thousands of run-down, weak men end women. Should quickly do the ваше for you! NO LETTER NECESSARY. Just send this ad with your name and address and 10c for postage апа packing. Complete treat- ment sent at once. Medical Aid Bureau, 529 S. La Salle St, Chicago, Dept. GA-209 Hugs 5'&10: COUNTER GOODS „ BIG PROFIT МАКЕҢ ns BRAND dealers —demonatrate World's greatest lini бош Card Goods: Aepirin, complete line Razor Blades, Merouroohrome, Peanuta, 65 big. new Em Ly makers, Powerful, selt-relling displays. xy Ed г dealers and you, Permanent, No investment to start. ра е FREE Саа RODUCTS CU. pencer, ind, j^" DINNO E - Ultra modern Piano Jazz taught by mail. Note or ear. Easy rapid lessons for adult beginners. Also Self-in- struction system for advanced pianists. Learn 358 Bass Styles, 976 Jazz Breaks, hundreds of Trick End- ings, Hot Rhythms, Sock, Stomp and Dirt Effects; Symphonic and Wicked Harmony in latest Radio and Record Style. Write for Free Booklet. WATERMAN PIANO SCHOOL 1830 W. Adams St. Los Angeles, Callf. How To Secure А GovernmentPosition Why worry about strikes, layoffs, hard times? Train сг now for a Government job in the future! Increased salaries, steady work, travel, good pay. Let me help you ige become a Railway Postal Clerk, Post Office Clerk, BA Cily Mail Carrier, Rural Carrier—or help you get § into any other Government job you want. I was а @ Secretary Examiner of Civil Service Commission for Ё 8 years. Have helped Wr dp book: tells Б the My 32-page book tells abou Now FREE jj: open—and how I can help | Æ you get one, Send the coupon for your copy TODAY. E ALT Patterson, orn RAE PATTERSON е aE bide, Rochester, N. Y Please send me, without obligation, your free book “How to Secure a Government Position." NAME ...esosseecsesseqeeeueoeceoovseoceceeteoevuseeee Address ..... €i 136 Rubber Bands Drive Midget Auto (Continued from page 95) will fit perfectly in the V grooves. Positive trac- tion can then be had with very little tension on the belt, and if the grooves are sand-papered very FNN little friction is offered when the belts idle. Fig. 9 shows the miscellaneous parts that enter into the complete car. The “gear shift” lever will appeal to boys who want all the do-dads, but if one forward speed only is used, the lever can be eliminated, as the free wheeling ‘arrangement does: away with. the need of an idler pulley. Fig. 8 offers a tentative design for the body of the midget car. This design is really a suggestion. only, subject to many variations at the whim of the builder. The Rubber Bands Now for the all-essential source of power—the rubber bands. These can be had practically with- out cost. Visit some tire or vulcanizing shop and buy a quantity of discarded inner tubes. The prevalentmarket price is ioc a pound. From out of this mass of rubber you are sure to find hopelessly blown out tubes with the rub- ber still live and active. With sharp, wire-edge scissors, start at the valve stem and split the tube completely around its inner circumference—the part next to the tire flap. The tube now appears. like a wide rubber belt. Now start at some point on the edge and cut a 3/16” strip around and around the belt. Eventu- ally the wide belt is converted into a long, narrow strip of rubber. Enough strips must be cut to provide 24 strands for each individual motor. The strands are looped in place without any pulling tension, and are held. on their clips with a wrapping of soft wire wound. in notches in the horns on the clips. The motors are wound individually with a wheel drill, as with a model airplane. Be sure the motors are wound in the right direction and the same number of turns to each. Stretch the bands well while winding. Use Graphite on Bands It is well to treat the rubber bands with rubber lubricant—powdered mica or flake graphite. Un- der ideal conditions each motor can be wound. nearly 2500 turns. The potential energy thus: stored up, if used sparingly, in conjunction with. the free wheeling, will give the midget car a three-mile range of travel. A rubber band motored midget car is subject. to a wide variety of designs. Perhaps the reader can think up a better design than this. Maybe a friction drive “job” with a wide range of driv- ing ratios might be better. No doubt more individual motors and a higher gear ratio would increase the travel range of this model. A commendable point of the design pre- sented is that the driving gears are subjected to no end thrust, since the motors pull equally on both ends of the shafts. Keep this in mind when you design a car. When a boy in any neighborhood builds a rub- ber band motored midget, his playmates are bound to follow suit. Competitive races are bound to ensue. Who knows but that we may have professional midget races? They race turtles nightly in Hollywood. Why not midget cars? nee Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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BOATS GANNET—Ford-Powered A deservedly popular boat plan. “A 24-foot cruiser, powered with Model T l'ord motor, driving her at around 15 m.p.h. Uses V-bot- tom hull, easy for amateur builder. Straight sides easy to plank. Bunks for two; plenty of room for provisions and $2 00 duffle. Price of prints .......c cee c cece cece hh * DOROTHY—A Cruiser Primarily & power boat, designed for cruising economy, noL speed. Good for 9 miles an hour with a 10 h.p. marine molor. Ford can be used if desired. Dorothy has n sail if the motor quits. She's 24-foot, plenty of cabin room for two or more; a $2 50 real deep-water performer. Prints ........ SA EGIT . WHIZZER—Air-Driven A speedboat driven by an air propeller and a converted motorcycle engine of one or two lungs. Lots of fun and plenty $1 00 of speed. тыы ЖИККЕ nnm P . BUDDY—18 Ft. Single-hander Designed by Sam Паль, embodying the ultimate in small single- handed sailing cruisers. Accommodates two with comfort on long erulses. Has 5 h.p. inboard motor, also provision for radlo installation. Blueprints are amazingly complete $4 00 and detailed, Price of prints, postpaid ............ m е PUNKIN’ SEED A small outboard racer, extremely simple to build. Cleans up in B, C, and D classes everywhore. Btrictly а $i 00 speedboat—easlly portable. Prints .................... . CANVAS CANOE А The simplest type for the amateur builder. Blueprints give al dimensions for a job you'll be proud of. $1 00 Price of prints, postpaid ..........................- . RACING ICE YACHT An iceboat of 175 ft. sail spread which cleans up in racing compe- tition. New lumber for this job costs about $8. Designed by an experienced ice yachtsman who has turned out the $1 00 utmost in speed and stability. Price of prints........ Р . MISCELLANEOUS SHORT WAVE RADIO CONVERTER With this conrerter you сап hear short-wave programs from amazing distances on your own radio set. Inexpensive to build— blueprints give full instructions as well as $1 00 diagrams. Price of prints ............. eese eere ы LONG HARLEQUIN MOTOR The ideal light plane power plant, using Marley Davidson 74 cylinders and other stock parts. Develops 30 h.p. on 90 lbs. Picking up an old Harley motor cheaply, this dependable power plant can be built for under $50. Price of full-size prints „ыле ке ваза жэке жазаа лал ҮЗ $5 .00 qi Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers Just off the press—this new, lavishly illustrated booklet, showing photographs Get Your FREE COPY of this Brand New Blueprint Book and descriptions of fascinating projects for the craftsman to build, on which genuine shop blueprints are available! Real projects for real builders—boats, light airplanes, trailers, and other man-size items. Every print listed is what is known in the trade as a “‘blue- line print," which is more expensive to produce than the ordinary blue- print, but more easily read. А copy of the Blueprint Booklet is waiting for you—ask for it, or send in the coupon below! Some of the Plans shown: CAMPING HOUSE-TRAILER Just the thing for vacation-time——a trailer with beds апа house- hold equipment, with a collapsible canvas roof and sides which fold up when nol in use. Four or more ean sleep in her. Price of prints ....... esee ТТЕ $1.00 М-М SPORT ROADSTER Blueprints, with full insiruetions for building, on an amazingly snappy and inexpensive job. Uses a motorcycle engine for power, chain drive—capable of 65 miles an hour, and looks like a custom bullt factory job at one-tenth the price! $2 50 Price of complete prints ....................... сенек Ы LIGHT AIRPLANES PIETENPOL AIR CAMPER ` The country’s most popular home-built plane. Carries two pas- sengers, powered with Model A Ford motor. High wing monoplane. Cost of construction, including motor, well under $500. Blue- prints show both wood and steel tube fuselages, and give motor conversion details. Hundreds of these prints have $7 50 been sold with complete satisfaction. Price of prints.... * PIETENPOL SKY SCOUT A mate to the Alr Camper. Single place, powered with Model T Ford molor. Cruising speed, around 75 m.p.h. The most satis- factory light plane with this type of motor. $4 00 Price of blueprints 2.1.1... cc csc sense ee hn * GERE SPORT BIPLANE The leading light ship of biplane design. Incorporates latest de- sign practices; fuselage is welded steel. Suitable for Model A Ford power plant, or any other motor up to 60 horsepower. Exclu- sive of motor, costs around $300 for materials. A real man-size ship that you can be proud to call your own. Price of blueprints ......„»«ж»ажа аяк кенаже наказ $5 .00 Modern Mechanix and Inventions, i 529 S. Seventh Street, Minneapolis, Minn. FebMM і Gentlemen: I Please send me my сору of ihe big new Blueprint Book by I return mall. This comes to me without the slightest obligation. | I enclose $...... in payment for blueprints of................ (Note: This form can be used if you wish any of the prints I 1 listed above without waiting for the descriptive booklet.) 1 pee pe- 137

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BETTER BOATS at Lowor Prices Two Big Factories Motor Boats $495 and up FULL LENGTH SPRAY RAILS— SOMETHING NEW А TVT Family Outboard motor boat with full length spray rails took first place and time prize in Mil- waukee-Chicago Marathon. " Catalog Free—Save Money—Prompt Shipment Please state kind of boat in which you are interested, 230 1HQM ES OM BROS. BOAT MEG. CO: 0n, WISCONSIN («неко ,) 130 NEW YORK "WONDERFUL | NEW INVENTION, SOLDERING IRON AND //; BLOW TORCH IN ONE (LESS Pays for itself in one job! Needs no pump or pressure system — no stove — no char- coal—no separate blow torch. Burns an hour at less than у 14 cent for gasoline. AGENTS’ OFFER WriteforSpecialOffertoagenta. The Justrite is ап ideal proposi- tion for either main line or side | line — full time or spare time. SUSTRITE MFG. CO., 2047 Southport Avenue, Chicago, 1. 9 make Crowns, Plates, Bridgework, etc., for Dentists, Easy, ргас- tical way to learn mechanical dentistry at home in spare time. Full equipment of TOOLS AND MATERIALS INCLUDED WITH COURSE FREE. Low tul- iion. Easy terms. Write for FREE ROOK ebout this money making profession and our easy- to-learn home study course and ix special offer, in E McCarrie School of Mechanical Dentistry 316 S. Wabash Ave. Dept. E-518 Chicago, Ill. QUIT TOBACCO No man or woman can escape the harmful effects of tobacco. Don't try to banish un- aided the hold tobaceo has upon you. Joln the thousands of inveterate tobacco users that bave found it easy to quit wlth the aid of the Keeley Treatment. ae! Treatment For Tobacco Habit Successful For Over 50 Years Quickly banishes all craving for tobacco. Write today for Free Book telling how to quickly Free yourself from the tobacco habit and our Money Back Guarantee. KEELEY INSTITUTE, Dept. D-751, Dwight, IbiInois Home of the famous Keeley Treatment for Liquor and Drugs. Booklet sent on request. Correspondence strictly confidential. | Making "Ghosts" for Parties (Continued from page 84) We were now instructed to place one hand on the table with the other hand placed over it. In this position we were to ask questions, either out- spoken or mentally, and our “affinity spirit” would answer them with a touch on the back of our. hand. One touch meant “no”; two touches, yes. When it came my turn I soliloquized the mental question: “How the devil does she do it?" A moment later I felt two clammy touches on the back of my hand. That meant “yes.” Were the spirits kidding me? In the green glow of the neon light I had watched my band unblinkingly. The light was ample. Yet, when the touches came, I didn't see а darned thing. It was uncanny. The meeting came to a close after "Madame" had given us her private consultation hours. On the way back to town, Eddie finally broke our mutual silence. "How the devil does she do it?" “I don't know—exactly. But I've got a hunch. We'll see in a day or two. As I say, it’s only a hunch, but...” * ж ж Сап you blow smoke rings? Do smoke rings fascinate you? They always did me. When I was a little shaver I made smoke rings. No, I didn't smoke—not then. I'd get an old card-board shoe- box, cut a circular hole about 114” in diameter in the lid, and then get my dad to blow cigar smoke into the box. Then I'd give the lid a smart tap with my finger-tip, and out would pop a per- fect smoke ring. In a still room it would rise io the ceiling without losing its form. Try this little trick yourself. It's entertaining. *Madame's" descending, nebulous halos some- how brought to my mind my early experiments with smoke rings. I decided to do a little ad- vanced experimenting along that line. So I made a little device which I call a gas ring pistol. A simple thing! Cost 15e: 10c for a pair of 4" em- broidery hoops, and 5c for a toy balloon. Note the sketch. A piece of stiff drawing paper is rolled into a funnel 4" at the big end and 2%” at the small end. A pair of 4" embroidery hoops holds the balloon rubber tautly across the big end. A wooden disk 4” thick and with an 144” center hole is glued into the small end. The edge of the 174" hole is faced with woolly material A crude handle is glued to the truncated cone. The handle is hollowed out for reasons explained later. There! We have a gas—or smoke—ring pistol. Blow several mouthfuls of smoke into the conical chamber. Then give the rubber diaphragm a smart tap with a finger-tip. Out pops a perfectly formed smoke ring. In a still room these rings will travel horizontally for ten feet or more before diffusing into the atmosphere. The nicety of these rings is probably due to the fuzzy nap on the woolly cloth which lines the hole. This serves well to retard the outer edge of the column of gas passing out the hole. I reasoned: “If this pistol shoots smoke rings, why won't it shoot other gaseous rings as well?" It will. Ammonia rings can be shot which, liter- ally, will make a person gasp. Black rings can be shot by filling the chamber with smoke made by burning a mixture of kerosene and gum gee Thank You for Mentioning Modern Mechanix and Inventions Jor February When Writing to Advertisers

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Making "Ghosts" for Parties camphor. But the best stunt of all is to shoot rings of carbon dioxide gas. This gas is much heavier and denser than air. I reasoned that it would hold its ring shape better. It does. The most readily available source of carbon dioxide is from the evaporation of carbonic, or “агу” ice. This is made by the multiple compression and cooling of carbon dioxide gas, until it is finally solidified. It is intensely cold—110 degrees be- low zero. Obviously, the gas rising from it is very cold, too. *Dry" ice is available in most cities. I obtained a piece, broke it into smaller pieces, and put them into the handle of the gas ring pistol. The vapor rising from the ice filled the chamber with chilly carbon dioxide gas. Playfully I shot a ring at the back of "the wife's" neck—about ten feet away. I didn't see a thing move through the air, but presently "the wife" gave a startled squeal and clapped her hand to her neck, proving con- clusively that the rings carry their cold with them. “The wife" wasn't half as enthused over the experiment as I. I got “one of those looks," and beat it. One of these pistols will afford a world of fun. A little perfume can be put in the chamber, and an “aroma ring" can be shot to any individual in a room. Another interesting stunt is to shoot out candles with the carbon dioxide gas. Since this gas will not support combustion, if the gaseous part of the ring passes through the flame, the candle is snuffed. out. Another new game for winter entertainment —missileless target shooting! Now, if a pistol with а 144” opening func- tions О. K, why wouldn't a “mortar” with an 8” or 10" opening function as well? It will. And pop out “halo” rings equal to *"Madame's". In fact, I guess there is no limit to the size that gas rings can attain. Did you ever see a shifting en- Eine in a freight yard shoot black, sooty rings a hundred feet or more in the air? * * * Next Wednesday night at “Madame’s”! The same crazy-quilt room. I studied the ceiling while the white lights were on. Just as I thought! The circular patches in the ceiling pattern were re- movable lids, lifted by a confederate in the room above. The faint scratches on the paint of the disks confirmed this. The seemingly disordered pattern of the ceiling was so laid out that there was a 12” circular opening above each chair on both sides of the table. One opening served for both seats at the end of the table. That was why the ring sometimes came down slightly diagon- ally. The chafing-dish steamed on the side table. Of course! The air in the room had to be moist so that the cold, descending carbon dioxide rings would form foggy halos, and afterward dissipate without leaving a trace. “Madame” swished into the room and took her accustomed chair. The white lights were turned off; the neon on. Clever stunt—the neon light. The fact that there was no reflecting sur- face on the furniture and fittings, and the semi- circular shield over the tube, kept the upper part of the room in complete, impenetrable darkness. (Continued on page 142) d Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers :25000worfh of > Money can’t buy 4 > better, more up- | to-date equip- > ment than what hey Sey and You’re Ready for a Big Pay Job! m For 26 years National has quickly helped men get ready for big pay, steady positions in the profitable Automobile fields. Don’t worry about previous experience, or whether you’re too old ог too young. We train you by “Actual-Shop” Methods on thousands of dollars of right-up-to-the- minute equipment. Start any time of the year. Your Railroad Fare Allowed to Los Angeles! It's only human for you to want to come to Cali- fornia. Every one does. How much better to come and get started right— quickly qualifying for the best pay jobs. We are making a railroad fare offer from any point in the United States! Never again will you get an opportunity like this. —and Don't Worry About Money! We'll Help You! Even if you're short on cash you can easily get National Training. We help you secure good part- time jobs to earn living expenses while learning. Unlimited Employment Service assures you real friendly co-operation in getting started on the road to real money, steady work and a prosperous future. Employers keep us busy sending them men—they know National Auto Men are the best, so they don’t waste their time on half-baked, untrained mechanics, National’s Doors Are Open to You! Investigate at Onco! Write now—today—for the whole story. Our big free book with fuil details sent FREE. Don't lose another minute. These offers are necessarily limited for a short time, Mail the coupon, and soon you will є, be on the train for Los Angeles, І NATIONAL AUTOMOTIVE, Dept. 23, 4006 Figueroa St., Los Angeles, Calif. Send me, absolutely free, your big illustrated catalog of Automotive Opportunities. inb 139

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INV NT P A YOUR IDEAS Write today for FREE BOOKLET, HOW TO OBTAIN A PATENT and RECORD OF INVENTION—or send Drawing or Model of your Invention for Examination. Promptness Assured with Best Results MILLER & MILLER REGISTERED PATENT ATTORNEYS FORMER MEMBERS EXAMINING CORPS U. S. PATENT OFFICE І 1006 Woolworth Bldg., Dept. B, New York City і | 203 EARLE BLDG. WASHINGTON, D.c. | | Please send me your Free Book, “How to Obtain | a Patent," and your “Record of Invention” form, with- | out any cost or obligation on my part. | | МАМЕ s ere ber e e e UH des ir AE nS | | ADDRBSS..: sce ta t ete | 5 Master Keys Work like magic in emergencies or prove whether your door or padlocks are burglarproof. OPEN $ AND TEST THOUSANDS OF DIFFERENT LOCKS. Recommended by users in ten different nations. Most wonderful and only keys of their kind. Send $1 today. (Also C.O.D.) Novel key chain FREE. Each key different. LA VALLIERE, 75 FOURTH AVENUE, NEW YORK, N. Y. me” HUMAN FIGURE Ability to portray the human figure pays better than any other kind of art work. Endless demand. Look in the magazines, newspapers and art galleries. Our new book, FIGURE DRAWING FROM LIFE by anew and simplified method shows the student how to draw the human figure correctly without a teacher. Large pages, 9x14, illustrated, Sent postpaid on receipt of $1.00. Money back if not satisfled. Catalog of other art books FREE. F. J. DRAKE & CO., Dept. 22, 181 No. Michigan Blvd., Chicago, III. 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. С. eu pu Z.H,POLACHEK | pietro? snd mo YOUR meas | Pat254 EROADWAYL | ang, esr 5151 МЕМ YORK [екше и ONLY 1. TRADE:MARK ву out obligation. РЕП. PATENT ATTORNEY PROF, ENGINEER | Name WHAT IS YOUR INVENTION? Send me a simple sketch of a model for CONFIDENTIAL ADVICE—DO IT NOW! 1.............. Фф! 140 Fortune Making Ideas for Inventors (Continued from page 119) ` may place either a letter or a small package and have it properly weighed and stamped after the proper amount is indicated on a dial. Then the mailer need only insert the proper coin and his letter drops down into a chute to await collection. Today we have all the neces- sary electrical devices to bring this result about. It will simply take some ingenious fellow to as- semble what has already been perfected into a new combination of elements. Specifications: Should occupy a rather small space and should not be too complicated. Should be able to handle packages up to one pound and should not cost over two hundred dollars to build. Exploitation: Should be patented only in the United States and may be either privately ex- ploited under the auspices of the Post Office De- partment or sold to the United States Government. 5. Furnaces That Need Not be Cleaned Hot air furnaces must be cleaned out at least once a season and more often than that if the fire did not have to be extinguished. By the mid- dle of the winter every furnace in use has accu- mulated a thick coating of soot and foreign mat- ter that has a low thermal transmission capacity and the result is the furnace starts to insulate itself from its surroundings. What is needed is either a way of filtering this out of the furnace as fast as it is formed or else having a lever so arranged that when it is pulled, the soot will disappear down a chute and into the ash pit. Specifications: This system cannot add over five dollars to the cost of building a hot air furnace and it should be a purely mechanical application. The design of the furnace might be changed in Quee fashion as to automatically take care of is. Exploitation: Should be sold outright for $25,000 and should be patented in the United States and Canada. Furnaces of this type are not used in Europe. 6. Non-slipping Floor Polish If I knew a bit about chemistry I would set out to lick this problem, for I know the result would be worth a young fortune. Count the lady friends and housewives among your own ac- quaintances who will not treat their floors with wax because it is dangerous. Wax does have the advantage of keeping a floor in good appearance and preserving it but it has been responsible also for a great number of serious accidents. Why is it not possible to find something, some- where, that may be added to the wax and that will not detract from its ability to keep floors in the proper condition and yet will prevent the wax from becoming deadly underfoot. Specifications: The materials used should be inexpensive, should have no odor and should not harm wood. It should also be colorless. Exploitation: Should be patented in all of the ue of the world and should be licensed only. gee Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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Fortune Making Ideas for Inventors 7. Pin-less Price Tog Here is a simple thing and yet it has escaped the attention of inventors for years on end. We need a new kind of price tag that will not make holes in the garments or articles upon which they are used. They could be sold to department stores by the countless millions and I feel sure that the inventor could roll up a tidy bank roll if he could solve the problem. Specifications: Must use no pins or clamps. Should in no way damage the garment and should be easily removed. Cheapness is a great factor and the cost should be a small fraction of a cent. Exploitation: Should be patented only in the United States. 8. Sewing Machine Stitch Locker I wish I had but one-hundredth of the money that has been made by the inventors of devices that could be used on sewing machines, to say nothing of the great fortunes that were piled up by the pioneers. There is still a great opportunity in this field. What is needed is a simple attach- ment that will lock the last stitch—that is, prevent the thread from coming loose. Specifications: Should cost not more than a dollar and should be fashioned so that it could be applied to any machine regardless of manu- facture. Might be made of pressed metal to keep production costs down to a low figure. Exploitation: Should be sold on a royalty basis with $5,000 down payment and 3% of the retail price of each article. Should be patented only in the United States. ELECTRICAL Complete Course in One Year A OONCISE, comprehensive course in Electrical Engineer- ing to prepare ambitious young men of limited time for engineering drawing and intensive shop-work. Students PREPARE NOW for future opportunities. 39 years’ | Successful experience assures you maximum training in new opportunities in the electrical fleld. Mathematics, construct motors, install wiring, test electrical machinery. Bliss Men Make Good minimum time, Catalog on request. ELECTRICAL BLIS SCHOOL 302 Takoma Ave., Washington, D. C. [Jie U.S. AIR CORPS, E Takes in over 700 men this year for Free Flying Training. Gives them over 200 SOLO HOURS, Special Uniforms, Transportation to the Field, Liv- ing Expenses, and $75.00 a month Pay while Learning to Fiy. Course in motors included. The Training costs absolutely Nothing. Let us Tell You: How to Get In, Information about Uniforms, Rank, Leave, and Actual Life at the New $10,000,000 Field. Send yourName. Hand postman $1 and postage when infor- mation arrives. It 1s Complete. Nothing else to buy. FLYING INTELLIGENCE BUREAU 401 Judson F. Rives Bldg. Los Angeles, Calif. NOW YOU CAN MAKE MORE in the new business-profession of correcting foot troubles without medicine, surgery or chiropody. Learn at home in spare time. Easy Terms. Earn while you learn. No capital needed. Write today for full information free. A. R. LARSON, 50 W. 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MOVIE CONTRACT GUARANTEED 8 I'll not only give you a perfect physique and pack your body with all the strength and mus- А cles it can stand, but I'll enter you in my Moyie Contest for а FREE TRIP TO HOLLY- " > z WOOD AND GUARANTEED MOVIE CONTRACT, as well as many Cash Prizes. If inter- ested in a Movie career, PI} help you personally all I can, DEVELOP A BODY LIKE MINE IN 90 DAYS Put yourself in my hands for just 90 days, and I'l fill out your chest until the seams in your clothes rip apart—I'll put muscles on your arms and shoulders that will laugh at loads— Tll make a mew man of you, a big, strong HE-MAN, with muscles of steel and the physique of a Greek God. Let me prove it! Jf over 16, write for my Free Illustrated Book, that tells all about my low-priced Course and famous MOVIE Con- test. It costs nothing to investigate. Just write to JOE BONOMO, 204-D BONOMO BLDG., HOLLYWOOD, CALIF, lc e 5 sections, brass bound. Big 3ft. Telescope 10-mile range. Study 2 Moon, Stars and dis- tant objects with this powerful 8-x instrument. Special eye piece for viewing Sun included FREE. Makes an ideal Micro- е. Guaranteed. Big value, Postpaid $1.75. С. О. D. ос extra, BENNER & COMPANY, T-75, TRENTON, М. J. a DRAFTSMAN Prove at our risk that you can learn at home — WITHOUT GOING TO SCHOOL without wasting time and spending a lot of *"" money . . , be ready for a real DRAFTING job in less than a year. By our short-cut method you learn AT HOME in spare time, and master every step in DRAFTING just as students attending this famous Engineering College do. So easy, so surefire in results you'll be a Draftsman almost before you realize it—ready to step into one of the many positions always open in this field. Send today for FREE TRIAL LESSON, No risk—no obliga- tion. You will be amazed at how easy Drafting has been made. A complete and valuable drawing outfit included without extra cost. CHICAGO TECH COLLEGE Dept. B-266 118 East 26th St. me 141

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Big Profits in Your Own Business at Home Steady, profitable work! Repeat sales! Cash daily! 10095 io 250% profit. Those gre your rewards for making the delicious, electric-baked, GREASELESS do-nuts with the Ringer Do-Nut Machine. Grocers, restaurants, drug NO CANVASSING Stores, lunch counters buy all you can make. Many operators sell entire output by boys. Е. L. Johnson, of Cal, writes: “My wife and I are working but make the do-nuts on the side and have no trouble in selling all we сап make," Mr. and Mrs. Louis Peltier, of Ohio, write: “We sell 75 to 85 dozen a day as 2 part-time business." FREE PLAN shows you how to start this fine- paying, repeat business. No ex- perience needed. Only $25 investment starts you in busi- ness. Full equipment furnished, including recipes for plain and fancy Do-Nuts. Begin at home in your spare time. Send a postcard today for full information. No salesman will call. RINGER DO-NUT COMPANY 192 Main St. N. E. Minneapolis, Minn. Prostate Sufferers. An Enlarged, inflamed or Faulty Prostate Gland very often causes Lameback, Frequent Night Rising, Leg Pains, Pelvic Pains, Lost Vigor, In- somnia, Etc. Many physicians endorse massage as a safe, effective treatment. (See Reference Book of the Medical Sciences, Vol. VII, 3rd edition.) Use “PROSAGER,” a new invention which enables any man to massage his Pros- tate Gland in the privacy of his home. It often brings relief with the first treatment and must help or it costs you nothing. No Drugs or Electricity. FREE Booklet Explains Trial Offer MIDWEST PRODUCTS CO. KALAMAZOO, MICH. MUR DR. W. D. SMITH INVENTOR Write Dept. 13. Learn Public Speaking At home—in spare time—20 minutes a day. Overcome ‘‘stage-fright,’’ gain self-confidence, focrease your salary, through ability to away othere by efectlve epeecb. rite er for free booklet, How to Work Wonders With Words. NORTH AMERICAN INSTITUTE, Dept. 2052 3601 Michigan Avenue, Chicago, liunois Knowledge Pays Big We teach you how to build and operate Radio Treasure Finders and how to locate Metals Under- ground. Fascinating, Scientific, Accurate. Ful details for 3c stamp—Write TODAY. Exchange, P.O. Box 607-R, El Monte, Calif. „фи 142 Making "Ghosts" for Parties (Continued from page 139) The show was on. Neither Eddie nor I was embraced by ghosts. р The meeting broke up. We donated a buck apiece. "Madame" didn't even say "thank you." Instead she gave me a wicked look. For she knew that I knew what she knew! “Well, did you prove your theory?" Eddie asked when we were outside. “Absolutely. The visible ‘halo rings —the ‘ghost rings’—were popped out of a device just like the smoke ring pistol I showed you—only much bigger, of course. Probably about a foot in diameter. The carbon dioxide is much heavier than air. Naturally the rings settle down. The icy cold gas in contact with the damp air made the rings slightly visible—filmy, ghost-like. When the gas diffused in the air, all visibility was gone. “Regarding the ‘spirit touches’ on the back of the hand, I could reproduce those with that little smoke ring pistol of mine, shooting them from port-holes in the ceiling. The fact of the matter is that the sensation of a light touch and of a change of temperature are almost the same. Mo- mentarily both sensitize only the surface nerves of the skin." “How do you know they were rings, though?" Eddie asked. *Well, you see I brought a little, fluffy feather with me and placed it on the back of my hand. When I got the ‘spooky touch,’ it whirled round and round a couple of times, and then floated off the table with a flow of gas. Carbon dioxide is much heavier than air, and flows almost like water until it diffuses in the air. “The ‘Madame’ saw my little trick through her half-closed eyes. I saw her face twitch with anger. But she couldn’t say anything. However, I have a strong hunch we will not be welcome there again.” : So much for "Madame" Y's spooks. I simply have no luck spook hunting. For fifteen years Ive been hankering to meet a real, honest-to- goodness ghost. If any readers have the acquaint- ance of any ghost, spook, goblin, banshee will they please arrange an introduction for me? And if Madame Y— out on Santa Monica Boulevard reads this, will she please please accept my pro- found thanks for two very entertaining evenings. Best amusement I ever had for two bucks. 'RAISE FUR RABBITS CHINCHILLAS & NEW ZEALIND WHITES z We Buy What You Ralse — Highest m. Prices Paid — Established 19 years. Е Illustrated book, catalog and Fur à Ferming Magazine, also Monthly Market Bulletin showing prices we pay. All for 10 cents. o large rabbitries, address one — z nearest yon. STAHL'S OUTDOOR ENTERPRISE COMPANY Dept. 133D NEW CITY, М.Ү. or HOLMES PARK, MISSOURI We send your Complete Outfit with Greatest Course of Instruction ever Offered. Get in business for your- self quickly. Steady work and big profits in fast-growing industry. 1 - Pay us weekly while you learn. 2 ў NEW ATTRACTIVE WINTER PRICE eet ess Aq | Write now for full particulars. Coleman Electrical School, 1672-X MainSt., Kansas City, Mo. Me Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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$ DOUBLE END 4" DISC SANDER, AND GRINDER Ideal universal machine for wood sanding, metal polishing and tool sharpening. Equipped with V-Pulley and full- length tables. Postpaid $1.00 or C.O.D., $1.25. Satisfaction guaranteed. Order today. Machine Spccialty Co., Dept. M, 169 Carter St, Rochester, (we New York. $1.00 JIG SAW Equipped with V-Pulley for your treadle or motor 15” long, 9” high, 614” table. | All metal construction. Sent © postpaid upon receipt of $1.00 (Canada, $1.35) C.O.D.'s 25e extra. FREE booklet, “Make Your Own | Jig Saw Puzzles," with every saw. X J. & H. Metal Products Co., Dept. 2, 480 St. Paul St., Rochester, N. Y.

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PLEASURE or PROFIT A fascinating hobby er а, profitable business can now be yours. Prepare quickly at home under the personal guidance of leading experts in the fine art of photography. No experience necessary. Full or spare time. Many earn while learning. Our thorough studio method also qualifies you to fill a well paying osition upon graduation. Send coupon now for FRE Bookie, Opportunities im Modern Photograph. Pt ete AMERICAN SCHOOL OF PHOTOGRAPHY 3601 Michigan Avenue _ Dept, 2052 Chicago. 111, Send FREE booklet, Opportunities in Modern Photography,and full information. Name Address

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post) YOURSELF! It pays! I paid J. D. Martin, Virginia, $200 for a single copper cent. Mr. Manning; New York, $2,500 for one silver dollar, Mrs. . F. Adams $740 for a few old coins. I want all kinda of old coins, medals, bills and stamps, Ipay big cash premiums. WILL PAY $100 FOR DIME 1894 S. Mint; $50 for 1913 Liberty Head Nickel (not buffalo) and hundreds of other amazin: prices for coins. Get in touch with me, Sen 4c for Large Illustrated Coin Folder and further articulars. It may mean much profit to you. rite today to NUMISMATIC COMPANY OF TEXAS. (Largest Rare Coin Establishment in U. S.) With Guggenheim Gold Detectors NEVER FAILS Used by Tourists, Guaranteed to detect gold and silver anywhere. Prospectors, Boy Scouts, men and boys everywhere to locate lost jewelry, burled treasure, rleh gold pockets and mines. Many recent Tortunes made by gold seekers. Sonora prospector located $2000 in gold nuggets. Send $1 for small size, $1.50 std. size, or $3 for profes- zional size in leather ense, and literature. 10-day money refund guarantee, GUGGENHEIM EQUIPMENT COMPANY Dept. 30-B, 156 Montgomery St. San Franeisco, Calif. Reducible Rupture Cured in Many Cases Forget your rupture— enjoy normal activities and pleasures of life in heavenly comfort and security with my amazing, patented Air Cushion Appliance! Sent on trial—costs во little—helps so much! 3 millions gold. Neglect of rupture often fatal so act now—writeformy Free Rupture Book and PROOF of cures! Н. €. BROOKS, 562-F State St., Marshall, Michigan. ae Ag ? L бе DoN'T COPY - LEARN TO EAM INTEL RAYE BURNS will teach you HOW to см ф ORIGINAL CARTOONS at Rome Баг AUN cn 85 SELL! Course has 26 lessons brit Send name арі address for free 600 Шолта Only. ET RAYE BURNS SCHOOL, Dept. F-8, Box 2194, CLEVELAND, OHIO Home Study Accountancy Training Accountants who know their work command responsible positions and ood incomes. And the need for rained accountants is growing. About 12,000 Certified Publie Ac- countants in U. S. and many thou- Bands more executive accountants. Many earn $3,000 to $20,000. We train you thoroughly at home in your spare time for C. P. A. examinations or executive accounting positlons, Erevious bookkeeping know edge qa ni —we prepareyou rom groun This up. Our training is supervised b B Castenhol holz, A.M SP. Á., АСД I" FREE! by staff of C. P. A.s. Low cost-—easy terms. Write for valu- able free 64 page book describing opportunities In account- ing field and telling how you may enter it successfully. LASALLE EXTENSION UNIVERSITY Dept. 2493-H cago Engineers Fight Avalanches (Continued from page 56) the occurrence of avalanches are issued by the meteorological service, and in the Austrian Alps, on the Tamischbachturn Mountain, a recently established observatory is devoted entirely to the study of snowslides and means of diminishing their dangers. On mountain railroads, in both Europe and America, tunnels and snowsheds furnish a par- tial protection from the unstable snowfields. American lines crossing the Continental Divide have spent many millions of dollars on the con- struction and maintenance of snowsheds. On the Great Northern for ten miles down the western slope at the end of the Cascade Tunnel, 76 per, cent of this distance has been protected at a cost of nearly $1,500,000. The sheds on this line have concrete retaining walls and a timber roof de- signed for a load of 1,500 pounds per square foot. The most extensive system of sheds, however, is that of the Southern Pacific between Blue Canyon and Truckee, at the crest of the Sierra. The snowfall in this district is hardly surpassed anywhere in the United States, amounting in some: years to more than 65 feet. To cope with this extraordinary situation the railroad has built more than 30 miles of snowsheds in a distance of 41 miles. They contain 100,000,000 feet of lumber, and their protection against ‘fire in summer is a big item of expense. IT COSTS YOU NOTHING UNLESS IT GROWS YOUR HAIR Eliminates Dandruff... Stops Itching Scalp We refund every cent of your money if you are not morethansatisfled. Nothing to lose. “The Bald Spots are Covered wlth New Hair," writes E. I., among many others. Send NOW for FREE information in plain sealed envelope without any obligation. SLAVIN CO., Dept. A-119 209 Post St. San Francisco, Cal. JACK SLAVIN CK SLAVIN еюге Treatments THE HANDY MAN'S HOME MANUAL, just off the press, tells you how to fix home plumbing, elec- trical connections, furnaces, furni- tute, sagging doors, etc.—Also car- ries plans for building cabins, trailers, fireplaces and many other items. At your newsstand, 50 cents, or send this amount to Fawcett Publications, Inc., 529 S. Seventh St., Minneap- olis, Minn., and your Manual will be sent by mail. изо у о о ә CNN NE US: 144 Thank You Jor Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers

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Makeup Secrets of Horror Pictures (Continued from page 47). paper. The dark brown of a pencil accentuated this slit to give a death-like appearance of slightly opened eyes. Now, as he lay in the coffin awaiting his cue to be reincarnated, the mummy was com- plete. Temporary plastic surgery changes many an actor’s face. Not long ago Pierce added a half- century to an actor’s face by pulling down the lower eyelids with fish skin held in place by liquid adhesive and making him up with stand- ard grease paints, properly shadowed and lined to achieve the appearance of age. All this takes place in the makeup room under lights duplicating in intensity and color those to be faced on the set. But the superlative in makeup is achieved with the more “outlandish” characters. When. Pierce was asked to create the charac- ter of "Frankenstein," he made Karloff's head look as though the top had been removed, a larger brain inserted, and a larger skull put back on. From Egypt came the suggestion. In olden days man were crucified and buried in an upright position. After many years had elapsed the weight of eyelids, mouth and fingers caused them to be- come enlarged and thicker. The cotton pad built up Karloff's head, cotton strips supplied scars ón the face, putty lengthened the fingers. Since he was to be a man recreated from the bodies of several criminals, brought to life by electricity, he could have no blood—and gray grease paint gave him a flat, lifeless appear- ance, People are interested in strange characters. Chaney's great successes and, more latterly, “Frankenstein,” produced at insignificant cost, prove the declaration. “Frankenstein” was one of the biggest money makers of the last three years. All sorts of odd faces and figures have appeared on the screen, all of them grotesque but relatively easy to create—once the makeup artist knew how. A little cloth, hair, putty, glue, grease and paint— that’s all. Consider the monkey face that appeared in one film. It consisted of half mask and half makeup. Pierce built the mask in five pieces, using cham- ois and rubber sponge. The nose was built on the mask, so located to appear fully an inch higher than the actor’s own nose. Padding filled in the mask to avoid hollows around the nose. Leather ears, sewed into the wig, and artificial teeth fit- ting over his natural upper and lower sets, com- pleted the effect. Employment for 500 Men at Once! A REVOLUTIONARY Chemical Sponge has just been invented that cleans cars like magic. Banishes auto-washing drudg- ery. Also cleans linoleum, woodwork, windows without work! Auto owners and housewives wild about it. The manufacturer wants 500 men and women at once to help him introduce this strange chemical sponge. He offers to send one for trial to the first person in each locality who writes him. Send in your name today—also ask for full par- ticulars on how you can get the Agency and without expe- rience’ or capital make up to $90 a week. Address: Kristee Mfg. Co., 2431 Bar St., Akron, Ohio -ği Thank You for Mentioning Modern Mechanix and I nventions for February When Writing to Advertisers Televiaion fa here! Television sets ere being Bold and serviced right now., Twelve large companies are working night and дау behind Yocked doors to improve their Tele- vision seta. Eighteen million radio owners are ейи tobuy. Televis- Jon broadcasting licenges are bein issued very cautiously. Thousan will get fabulously eh in the im- mediate future from, Television. Thousands will secure high pay jobs. But only the men who know Tele- vision—the men who are especially trained—will reap these profits— these fine jobs. Television moves too. fast to bother with untrained men. Why not decide right now to find out for yourself the tremendous ossibilities of this fascinating new Bigo-pay profession? You can be- come an expert hero at the world’s atest Television School, occupy- ng the three top floors of Missouri’a tallest skyscraper — а big, finely equipped school owning and operat- ing W9XAL, its own Television Broadcasting Station. First Nationel graduates are al- ready being heard from; for exam- le, Mike McMullen saya, in epeak- heot the job which he secured with First National training, *1 am in complete charge of transmitter and control room and doing quite g bit of ennouncing". Harold He another graduate, says Since completing your Radio Television course, I have been employed as ор. erator of the Topeka Police Radio Station,” You, too, can qualify for one of these fine jobs. The first step isup to you. Ifyou are over 17 years of age, gend your name and address today for full information. Sid Noel, President FIRST NATIONAL TELEVISION 2904 Power & Light Bldg. Kansas City, Мо, ANY PHOTO ENLARGED Size 8x10 Inches or smaller if de- sired. Same price for full length or bust form, groups, landscapes, pet C animals, etc., or enlargements of any part of group picture. Safe return of original photo guaranteed. SEND NO MONEY 7:109 or snapshot (any size) and within a week you will revelve your beautiful life-like enlargement. агапё сед fadeless. Pay postman 470 ier lpostage or eend 490 with order and we pay postage. В Өхл20-(поһ enlargement sent C. О. D. 780 plua postage or sent 80c and we pay postage. Take advantage of thie amazing offer now, Bend your photos today. Specify alze wanted. s Standard Art Studios, 908 W. Lake St., Dept. 373-B, Chicago, n. Mends а hole or stralghtens a heel for 1 cent. New plastic inrention—SA VASOLE—spreads on - soles like butter on bread. Hardens over-night into smooth, strong wearing surface. No Nails. Old knife only tool. Child can apply. “New” Soles and heels look and feel like leather. "1:90 aWeek Pay Agenta cleaning up big money In spite of ''Hard Times.'" Spare time or full time work pays big. Experience unnecessary. Many sales in homes, 26 ies factories, railroad yarde, etc. Rich territories open. $ Р Write for free ESA of Savasolo on leather. THE MELEE: бера AVASOLE CO. SA Cincinnati, Ohio ine. 145

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NEW ELEC i m Cea А TESTING PM NOTES ЫЧ CHES FUSES yrrugganps [ВИН Ший e PUERMTORS E ORCUT : PAISFORHERS BREAKEI FACTOR È LATEST IN FORMATION: SIGNALS : METERS : nous HIGHLY ENDORSED EXPERTS HOME STUDY COURSE Audels New Electric: Library is-an entirely new reference Series for engineers; electrical workers, mechanies., _Indinte- nance,service men ajitistudents. 10 pocket Hand Books, ‘cop- taining 5690 pages—9056aillus-- trations and diagrams—full information on the latest appli: cations of electricity, uM я All fully illustrated ith. “tast questions, . rules, diagr&ms" ond caleulations—practical ready qef- erence—all up to date. Highly endorsed— easy to read, understand and own — RED FLEXIBLE COVERS, GOLD EDGES—The complete Library supplied for 50c. a week. Books $1.50 each and sold separately. No Risk in Ordering — Satisfac- tion Guaranteed — Shipped Free. -Ф% Lec ol to ELECTRICITY IN A HANDY FORM— „енп ing. ignition, Telephones, Electric Refrigera- ^ e Pumps, Lighting, Slgnals, Alarms, иті г tures, Television, Radio, Railway pugnae: grams for Light and Power, Code, Line SN ables, D. C. and A. C. Systems, Main- hines, Troubles, Armature Winding, Electrical Rules and Principles, also THEO. AUDEL & CO., 65 W, 23rd ST., N. Y. CITY і Please ship me for one week's free trial "Audels New Electr’ Library," price $1.50 а volum, If satisfied, І will mail you 50c.* or More each week as payment, TIERS WAY 50 SETA A WEEK AddresS... leid Rede as e reser ed Not a cent to pay until you see the А . books. No obligation.to buy unless Оссирайоп............+.+з+3+.+ "PPP you are satisfied. Fillin coupon in pencil, Send now—today—get this 1 MM new experts standard library. і Employed by. oo. Lesser ono ap.

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Rupture Victi two-fold. ure system has been Pa ;veloped, : tested by thousands of people. It is | don the remarkable record made by Drè Jay W. Seaver at a great eastern ,Whtiversity, and a special new kind of way ло suppart. rupture. You do not have to wear leg straps, torturous springs or cruel hard chads, Instead, Suction-Cell Re- tainer provides deep-tissue support for " your rupture. „А. ‘special offer is now being made to ctims. That offer . says that unless” your-rüpture is actually ` and decidedly reduced in size within 30 days. after wearing Suction-Cell Retainer, it;does not cost you one penny. Read | below the details of results accomplished Ъул Dr: Seaver and then mail coupon : immediately for free proof offer. 3 NMENCE is every day making new áccomplishments. Dr. Seaver's record :Һауе shown that he actually cured rupture among the students of the UniVersity in more than 7 out of 10 cases. Some of them were baseball players;; some gymnasium performers and others athletes engaged in strenu- ous exercise. He not only freed them from having to wear trusses but allowed them "to. go ahead in their exercise... Now, thanks to another man widely experienced in rupture relief, the es- sentials of the Dr. Seaver methods are available to everyone, with the radi- Mail Free Proof Coupon Immediately Plan Used by, Жаз Physician of Great Renter University Kean in Curing Students . . . Now Given to s Everywhere cally different Suction-Cell idea for re- taining rupture. : do with medicinés nor pastes, and can be used without cumbersome straps or ,elastics, weighs but a few ounces and is not noticeable through the clothing. Rupture sufferers and people wearing it say they scarcely know.they-trave it on. But most important of'alf when’ used * A 1 guards according to instructions against the dangerous‘ “ coming down." What the wearing of Ssction-Cell re- tainer really means’ is “Sest indicated by the extraordinary о#её пом made to send it to ruptured people for free proof use—with the understanding that un- less it actually reduces the size of the rupture, during trial there is not one cent of cost. Every man or woman who is rup- tured owes it to himself to find out immediately full details concerning this modern advancement in rupture relief. Authorities say that many victims face the grave dangers of strangulation, be- cause their ruptures: are never properly held. In many cases appliances worn actually cause this danger to be in- creased, Everyone who mails the coupon below is now being sent an interesting : booklet on rupture; facts are given about the danger and cause of strangu- lation, the /cimportance of proper re- placement of rupture and other vitally interesting information. Partof New! Methodinme zing Suction Gell Retainer . . Mielkes Cruel, Gouging Trusses University Physician Amazes World With Rupture Curb! ‚ Here is great ‘news focupture victims. You will also receive letters showing what the new methods have accom- Suction-Cell Retainer has nothing to ‘Plished for people of every age in every walk of life—some of whom had been ruptured for more than a score of years. You will receive information about the methods as used: by Dr. Seaver at the great Yale University and you can de- termine for yourself what they will mean to you. Do not delay an instant. Mail the coupon now so that you will be entitled to the decidedly valuable FREE PROOF OFFER before it is with- drawn. NEW SCIENCE INSTITUTE 2505 - New Bank Bldg., Steubenville, Ohio TTC New Science Institute, 2505 New Bank Bldg., Steubenville, Ohio | sena me at once free details of the Dr. Seaver method, Suction-Cell Re- tainer, and the Free Proof Offer which allows me to use Suction-Cell Retainer, with the understanding that it must re- duce my rupture within 30 days or it costs me nothing.

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METALLIC LIQUID BINDS ALL KINDS OF MATERIALS TOGETHER AS IF WELDED! HE universal mender has been discovered at last! METALLIC-X-—-a mysterious liquid metal binds all kinds of materials to- gether as if welded. Any combination possible —wood to wood—metal to glass—metal to metal—glass tò metal—glass to glass and Scores of others, all bonded together as if one piece! Amazingly easy to use too. No skill required—no heat, acids, clamps, soldering irons or tools of any kind needed. Nothing like it for repair jobs of every description in home or industry. Preferred for both mending and new work by carpenters, cabinet makers, pattern makers, furniture factories and many more, in place of glue, cement or solder be- cause it is so much stronger, easier to use, and can be used for so many more purposes. Metallic-X even replaces welding and riveting in many cases! Best of all, any joint made with Metallic-X is made for good. Unaffected by heat, watér, oil or atmospheric conditions. Will not crack, soften or dry out—and wild horses cannot tear it apart. FREE SAMPLE So astounding are the results possible with Metallic-X that it is-impogsible to realise what a wonderful product it really is, without see- ing a sample of work done with it. The makers of Metallic-X have prepared such a sample and will gladly send it FREE of all cost to any one mailing the coupon on this page. No obligation. See. with your own eyes what Metallic-X can do, test its incredible strength— learn how many ways it can be useful in your home or business—Mail the coupon at once! 4: LUX-VISEL, inc. Aietallic-% Division, Dept. B-5081, Elkhart, Ind. MEND ANYTHING Amazing New Way! AGENTS.. DISTRIBUTORS | Маке Up To $175 in a Week! i Every bit as amazing as the product-itself are the unbelievable profits it makes possible. Unques- tionably the greatest money-making proposition in a generation. Sells like wildfire either in stores or direct to homes! Tremendous earnings either way. Only 50 stores with average sales of but 3 tubes a day each pay you $120 a week. Add- ing to that the almost equally sensational earnings possible through sales direct to homes brings $150 to $175 within reach of any really ambitious man or woman! Better still, automatic repeat sales assure permanent, steady income with unlimited possibilities for future development. You owe it to yourself at least to investigate this extraerdi- nary opportunity. The coupon below brings you all the facts about Metallic-X and the sensational new merchandising plan that has set the entire direct-selling world talking! Mail Coupon ORAS 2 EED ваша Белин SG ENIES ee нела ШЕРИ prm Visel, Inc. Dept. B-5081 Elkhart, Indiana. EE Rush me full information about Metallic-X with amazing FREE job-sample. Also explain sensational new plan that yields PROFITS up to $150 in a week and more.

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uble Page Spreads

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adi More Money for You in SPECIAL Radio Equipment My book, "Rich Rewards in Radio," Get ready $or jobs like these Broadcasting stations use engineers, operators, station managersandpay up to $5,000 a year. Radio manufacturers employ testers, inspectors, foremen, engineers, service men, buyers, and managers for jobs paying up to $6,000 a year. Radio dealers, jobbers (there are over 35,000) employ service men, salesmen, buyers, managers and pay up to $100 а week. Talk- ing pictures pay as much as $75 to$200 a weekto men with Radio training. There are hundreds of oppor- tunities to have a spare time or full time Radio busi- ness of your own. I'll show you how to start your own business on money made in spare time while learning. My book tells you of other opportunities. . for Broad Practical Experience Given Without Extra Charge My course is not all theory. TII show you how io use my special Radio Equipment for conducting experiments and building cireuits which illustrate important principles used in such well-known sets as Westinghouse, General Electric, Philco, R.C.A., Victor, Majestic, and others. You work out with your own hands many of the things you read In our lesson books, This 50-50 method of training makes learning at home easy, interesting, fascinating, In- tensely practical. You learn how ace SS You can learn at home in your spare “I spent fifteen years time to be a Radio Expert aa traveling salesman Hold your job. There is no need for you to leave but could see the op- | home. I will train you quickly and inexpensively portunities in Radio. I | during your spare time. You don't have to be a high than ever before. Ihave | Schoolorcollegegraduate. My Course is written in a mademoraithan 5400 each | clear, interesting style that almost anyone can grasp. your course that brought | I give you practical experience under my 50-50 me te this d G Pah | method of training—one-half from lesson books and San Francisco, Ca. -° | one-half from practical experiments with equipment given without extra charge. It makes learning at home easy, fascinating, practical. Learn the secrets of Short Wave, Television, Talking Pictures, Set Servicing, Broadcasting " н — F a i Jd and thor- I'll give you more training than you need to geta With N. R. T. equipment you learn to build а! : iue | 1°5—ГП give you your choice, and not charge you Ys M. Hb 1 equipment in sour spare nume service Radio Service | extra either, of my Advanced Courses on these sub- work for extra money. jects.—(1) Television, (2) Set Servicing, and Mer- Ber ro e chandising, (5) Sound Pictures and Public Address I have doubled tems, ting, i i 1 T spent 15 years | Radio Stations, (3) Aircraft Radio SQN tripled the Salaries of many. sets work, why they work, how to make them work when they are out of order. Training like this shows up in your pay envelope— when you graduate you have had training and experience— you're not simply look- ing for a job where you сап get experience. Television—the coming fleld of Many great opportunities —is covered by my course, ives you information on the ortunities EE the opportu Sample Lesson FREE quickly to become a Radio Expert through | prove that my Radio Course is my practical Home Study training. It is | easy, practical. That's how con- free. Clip and mail the coupon NOW. | YOU st home inyoursparetime Radio’s amazing growth has made hundreds | to become а Radio expert. Only of fine jobs which pay $50, $60, $75, and | inthe past. LKNOW that when ^ 2 $100 а week. Many of these jobs may you see it, read it, examine it, bos Broadcasting Quickly lead to salaries as high as $125, Чеш. simple way of teaching ‘rained Dia ons employ $150, and $200 a week. к Ж OW because Т up to $5,000 a year. sands of men. Many of them with not even a grammar school Ever so often a new business is started. You have electrical experience, have be- seen how the men who got into the automobile, come Radio experts and earn started had the first chance at big jobs—the $5,000, | Ба}. Mall the $10,000, and $15,000 a year jobs, Radio offers the m It has already made many independent—will make many more wealthy in the future. You will be time opportunity. Many Radio Experts make In a few years 300,000 jobs have been made by Radio's growth. Thousands more will be made by —the kind of training I will give you in the N.R. Course—have stepped into Radio at 2 and 3 times well as beginners praise N.R.I. training for what it has done for them. in Radio and explains how I train you I'll send you a Free Lesson to fident I am that. I can train my students could have this book you will be delighted with its men for jobs paying have ALREADY trained thou- Radio—the field with a future КҮКЕ ahd S ae motion picture, and other industries when they were | two or three times their former same chance that made men rich in those businesses. kicking yourself if you pass up this once-in-a-life- $50 to $100 a week its future development. Men with the right training their former salaries. Experienced service men as Many make $5, $10, $15, a week extra building endrepatring Radios, but felt I could Your money back if not satisfied Some of the Jobs refresh my memory. in spare time almost at once = Upon. соо wel „T will give you an agreement in writing, legal and My Course is world-famous as the one “that pays N. R. I, Trains appointed Service Мапа. | binding upon this Institute, torefundevery penny of for itself." The day you enroll I send you material, Men For Ко fal credit forms | your money upon completing my Course if you are hi Should ickly, for doing 28 Radi guecens---it immediately | not satisfied with my Lessonsand Instruction Service. which you should master quickly, for doing adio incensed yay earnings 100 | ТУ A miy нэ and Lastruch ,EzweZie jobs common in most every neighborhood. Through- | Broadcast Engineer preen a He Meteors | The resources of the National Radio Institute, — Ag еп out your Course I will show you how to do other re- Maintenance Man in е5, Gpfiford Ave., ioneer ап orld's Largest Home-Study seoP t S1000 а vas. iv and service Joba 2n the side for extra money- Т Broadeasting Station time men make as much as $50, P&I and Service Јо s Radio School, stands behind this agreement. Installation Engineer of $65, and $75 8 week. will not only show you how to do the jobs, but how to get them, I’ll give you the plans and ideas that have made $200 to $1,000 a year for N.R.I. men's spare time. G. W. Page, 110 Raleigh Apts., Nash- ville, Tenn., writes: “I made $935 in my spare time while taking your Course.” Broadcast Apparatus Operator in Broadcast Station Aircraft Radio Operator Operator of Airway Beacons Service Man on Sound Find out what Radio offers you. Get my book AT ONCE. One сору of my valuable 64-page book, Rich Rewards in Radio,” is free to any resident of. H and Canada over 15 years old. It ha Mr. J. E. Smith, President National Radio Institute, Dept. 3BH Picture Apparatus Nur m started hundreds of men and young men on the From $10 to | !osdtobetter jobs and a bright future. It has shown Apparatus ht iu ; В ship Operator $50 a week sn | hundreds of men who were in blindailey jobs, howto Washingten, D. С. | Service Man on Public 18 | cet intoeasier, more fascinating, better paying work. I want to take advantage of your Special | Toe Depart Address Systems Spare time Ittells you where the good Radio jobs are, what they Offer. Send me your sample lesson and your | | ee ате па. | Tgtellation Engineer on “Besides being em. | рау, how you can quickly and easily fit yourself to [тее book about spare time and full time | т Publie Address Systems [oyed by the Power & Radio E The C ill bri И Radio opportunities and how I can train for | great aid in Sales Manager for Retail ight Company to locate | 06 à Radio Expert. e voupon WI: Dring You а them al home. This request does not obli- their work. 5 Radlointerference, Ihave | Сору free. Send it at once. Your request does not * Stores ү F © ү gale me. Many good Service Manager for Retail owa tnat леуге {татр | Obligate you in any way, ACT NOW. ` І jobs have been Stores to $50 a week in spare ^ made in this Auto Radio Installation and time. Lowe ай my suc- i Talking Moyler—am hwenton made a ito Badio Mi feaa to tne National Radio J. E. SMITH, President А AE == | Raroa Кад men for jobs paring эн Television Broadeast Operator сотто? ноге | Dept. 3BH, National Radio Institute much аа $75 to $200 & week, Set Servicing Expert Seer Ee Pow High Washington, D.C donus I Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 9 8 Thank You for Mentioning Modern Mechanix and Intentions for February i hen Writing to Advertisers

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Small Ideas May Have Large Commercial Possibilities: I Serve You Quickly and Secretly Delays are Dangerous in Patent Matters HE FREE BOOK shown here was prepared for inventors, to show them exactly what steps they must take to secure а PATENT. If you have an idea, you should send for THIS BOOK AT ONCE. It will tell you exactly how an application for a Patent is made, what information you must furnish your attorney, and what steps he must take in order to protect your inter- ests. Remember, inventing an article is one thing—securing the exclusive right to manu- facture it, use it or sell it is another. Without a U. 8. Patent, you cannot expect to reap the profits that your in- vention may make possible. Send at once for this book. After you get that, you’ll know exactly what to do to protect yourself. Anything you write me or send me is strictly confidential between us. All let- ters and drawings are kept in strong, Steel, fireproof files, which are open only to myself or authorized members of my Staff. I have secured patents for inven- tors located in every state in the Union. My organization is a large and efficient one. My practice is confined entirely to Patents, Trade- marks and Copyrights. I have had years of experience in Patent Matters. When you place your ideas in my hands, Iam in position to proceed at once to secure protection for you. My fees are reasonable, and if you desire, I can arrange convenient terms of payment. Important! Please understand that you are not under the slightest obligation in sending forthis book. I will mail it, together with the Record of In- vention form, thesame day I receive your re- quest. Use tie coupon on the opposite pageto save yourself time and trouble, After that, you will be in position to proceed or not as you choose,to make your ap- My Location in plication for a patent. Washington My offices in Washington are convenient to the Patent Office, and I and my as- sistants can, therefore, appear promptly before the officials and Examin- Ф Above is a view of my drafting and specification rooms where a large staff of experts is in my constant employ. 9 The photo at the right shows a section of my large filing depart- ment. All disclosures from clients are held in the strictest confi- dence in strong, steel files. E M ———————————————Wá» 12 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers INVENTORS | write today | for this | FREE Book This Book Tells: How your Patent Application is made ; what kind of sketches or drawings are necessary; what other papers must be made out; how the Patent Laws protect you; why it is important to avoid loss of time in getting your application filed; and many other important points. Even а very sim- ple idea, if new and useful, may prove very valuable. You may have much to gain and nothing to lose by sending for this book TODA Y. eee A view of the new Dep't of Commerce Building where the U. S. Patent Office is now loegted. CLARENCE A.O BRIEN REGISTERED PATENT ATTORNEY WASHINGTON, D.C. to make a sketch of your idea in proper legal form and have it wit- nessed in such manner that it may be of value to you as evidenceshould the occasion for evidence arise. In my book, I tell you how to use this form to protect your interests. | CLARENCE A. O'BRIEN, | | Registered Patent Attorney, I l 317-W, Adams Bldg., Washington, D. C. I sit adis caa ul Please send at once your book, *How to Obtain a Patent" and [ | your “Record of Invention” form. [ FREE Record. of | l Invention Blank | Nus | Along with mybodkIwilsendyon | Amer ————— | my Record of Invention form, also FREE. This blank will enable you | ADDRESS [| p APDRESS... eee эра жю» ————— MM E 1 і l I 1 1 (Be sure to write or print name clearly) ———————— Thank You jor Mentioning Modern Mechanix and Inventions јог February When Writing to Advertisers 13

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is FREE BOOK TellsYou ct Your Invention Delays in Patenting Your Idea May Prove Costly Get the Facts—Mail Coupon Now ACT AT ONCE—and protect your idea. Remember, to get the benefits of your invention, you not only have to invent it—you have to PATENT it. Many men spend years perfecting an invention, only to find that someone clse thinking along the same lines has already received a patent on the idea. When we think of all such cases that have come under our personal observation, we cannot urge too strongly that you take steps to protect your idea IMMEDIATELY. Delays of only a few days may be vitally important to you. Do not - lose all the benefits of your hard work in planning and perfecting your invention. Mail the Coupon £or FREE Book Today It is of tremendous importance that you file your application for a patent at once. Our free book tells you how to proceed, what you need to know about patents in general and gives you an estimate of our reasonable fees. We also send you a "Record of Invention" blank. Take the first step toward getting your patent now. Mail the coupon at once. If you send along a sketch and description of your invention, we will promptly write you what, in our opinion, ought to be done in order to protect it, and for which service there will be no charge. Highest References—Strictest Secrecy 35 Years of Proven Service—Deferred Payments The members of the firm of Victor J. Evans & Co, are registered Patent Attorneys. Our legal and technical forces include lawyers, registered patent attorneys, patent draftsmen and searchers. Our Patent Office and Federal Court practice is confined to patents and trademarks. We specialize in these two subjects to the exclusion of all others. In our 35 years of patent practice, we have successfully served thousands of inventors to whom we can refer. It is a distinct advantage to an inventor to employ an attorney located in Washington as the U, S. Patent office has no branches. Here's How We Operate Аз soon as the description of your invention comes into our office, it is immediately put in charge of an attorney, who is particularly familiar with the kind of invention you have perfected. Under his close personal supervision, patent searchers and skilled draftsmen work. He personally sees your case through to its conclusion, In short, you have the advantage of highly skilled and experienced service, E 14 Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers mpe VALUABLE RECORD Recory FRE OF INVENTION BLANK AyveDtton Mail the coupon today, and in addition to the free book, we’ll send you without charge а “Record of Invention Blank." This form, when properly filled out, may be of value to you as evidence should occa- sionrequireit, There is no charge or obligation for this o Bhon tt Bay Contern: Be it Koown that has this ol. the invention usa — 192. disclosed to. described on ба sheet the constuction bere What the Coupon Brings Mail It Today! Mail the coupon today and take the first step toward protecting your idea. You will receive the FREE Book, a FREE Record of Invention Blank, and informa- tion on our fees. You create no obligation by. mailing this MAIL | pau coupon. Our service 15 com- 1 ‘HIS 7 plete, our fees reasonable NOW, and our terms convenient. VICTOR J. EVANS & СО. mail the coupon NOW. Established 1898 REGISTERED PATENT ATTORNEYS. MAIN OFFICE: 605 BB Victor Building, Washington, D. C. BRANCH OFFICES: 1640 BB Conway Building, Chicago; ! 233 BB Broadway, New York; 828 BB Fidelity Philadelphia і Trust Building, Philadelphia; 514 BB Empire Building, Pittsburgh; 1010 BB Hobart Building, San Francisco. і Please send me your free book, "How to Obtain а Patent," and your "Record of Invention Blank." This request dees not obligate me. Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 15

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[THIS ELECTRIC TELEGRAPH SET 15c DOT "au DASH telegraph system of your, SENDING & RECEIVING Complete with MORSE CODE TS end Directions for Operating Pom YA, BOYS! Have a private own! Lots of fun sending messages to friends. A very reliable outfit ihat sells for 15e. Get two sets, us- ing one for sending and the other for recelving. With this outfit you can learn to transmit and re- ceive messages by the Morse International Code, and in a very short time become an expert operator. Measures 4 x 3 inches, first class construction throughout, complete with key, sounder and magnet, Morse Code printed on wooden base, and full printed instructions. ONLY {5с each set postpaid. JOHNSON SMITH & CO., Dept. 919, RACINE, WIS. ONLY 10c j Per Pair Fighting Roosters Wilh very little practice . —— Wade of deme ашны 0000 LUCK RING imitate in the most life-like Very striking, guaine, and menner the evolutions of a| uncommon. FIERCE COCK-FIGHT.| skull and. Endless amusement, ` Well made, with real feathers. P 10c. З pra. 25c. postpald. MIDGET BIBLE GREAT Ч ‘CURIOSITY gm BmaliestBible n the World. Ppreciated. Make good money selling them to nds, church acquaintances, sto. PRICE 15c ench, 3 for 40c, 12 for $1.35, 100 for 57.50, Also obtainable In Leather Binding, with gold edges. ice 60а h, 3 for $1.25, $4.50 per Glass for use with Midget Bil SERPENT'S EGGS Box contains 12 eggs. When T lit with a match, esoh one gradually batches itself into а enako soverad feat long, which curis and twists about in a most lifs-lika manner. Withabunoh of these bills, it 18 easy for each person of limited means to appear prosperous y fashin а rollo - Ki these bills i S) at the proper time and peeling off а genuine bill or two from the outside of the roll, the effect created will be found vo be all that can be desired. Prices, postpald: 40 Bilis 20c, 120 for 50c, or §3.50 thousand postpald. NOSE FLUTE The Mazio Nase Flute, or Hue manaton unique and y novel ш trument that is played with nose and mouth combined. There is just a little knack in play i it which, when once а juired after а е prac- Post d tice, will onal Paid produce ve 10c MEM music that somewhat resernblee а flute. There ie no fingering, and once you have mastered it you can play all kinds of music with facility ene JOHNSON SMITH & со. : LATEST CATALOG D ent. 919 е Loxe Edition of oor 2933 CATALOG ir Bae dian and Foreign Stamps for Address orders for all goods on. above and on following page to Johnson Smith & Co., Dept. 919, Racine, Wis Thank You јог Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 24 Exploding Box contai Bri t gets в тегу E lt goos off witha A ereat mirth pr. tlrely harmless. Price 25: fun then fghting with your wife. Look just like ordinary Matches. Ав the victim tries to light one he gets quite a surprise. Ё Price 10с per box, 3 boxes for 25c, 12 lor 75 cenle. STAR TOY MAKER Greatest boys’ book written. Tella how to make в Pinhole Camera, a Canoe, model Railroad, a Tele- phone, Boomerang, Tele- raph Instroment, Box ite. Talking Machine, Місговсо "tri SH ec tr le otor. Electric Door Bell, Water Wheel, Paddle Raft, a palr of Skis, House, Rabbit Yard, etc. 64 peges, 150 illustrations. PRICE 100. BOY'S OWN TOYMAKER. A new book. Telle how to make chemical toya, electrical toya, galvanio toys, mechanical toys, paper toye, cardboard toys, boats, traps, eto. 200 а Dog Sled, В! illustrations. Price 250 postpaid. FUN WITH MAGNETISM. 50 novel and unique experiments in MAGNETISM that 5 you ean perform with the aid of en ordinary magnet: maenetio chain, fleeing and spinning needle, nail and bal cluster, magnetic fish, top, motor, magnetia billiard balls, many other stunts, Also interesting information about lodestone, magnetism, electric ty, ete. PRICE 10е p.pd. BOOK ON BOATS. How to build rowing, soiling boate. Xverythlng pertaining to boots explained in plain terms во anyone ввп under- stund, Illuslrated. 10c p.pd. G-MINUTE HARMONICA COURSE. A new easy self-teaching method. Teaches how fo play, to use the tongue, tremolo, fully illustrated, Price 15c noi 1а. MONEY MAKING SECRETS. Golden oppor. tunities for everyone. 64 page copyrighted book chock full of money-making Ideas, recipes, formulas, wrinkles, trade secreta, ete. Busi: nesses that can be started with little or nn capital nt home in spare time. 10c postpald. TRICKS & SOCIAL ENTERTAINER. Сол. taine hundreda of simple tricks, illusions, di veralons that anyone can do. Also explains secret of second sizht. Price 25c postpald. m~ elephone, Works Indoors or Outdoors. 100 ft. or 1000 ft. clever toy, it js quite as serviceable for rate apparatus made and it i Though this je merely a vei short distances вв the most elo! liable to get out of order or to need adjustment; in fact it cannot be rendered inefieient unless roughly handled. j it ia much less 1 lesome battery, no intricate " Сап be put to practical use from one room to another, up ог The palented sounding discs tranamit practical talking tele- and full instructions, JOHNSON SMITH & CO. Wonderful Instrument. ‘down etairs, around corners, eto. and receive the voice perfectly, making it в reall Bet consiats of two phones, tranemlasion cori PRICE ONLY 65с per set postpaid, Everybody de- lighted with it. Odd, Curlous and interest- ing. Lots of pleasure as well аз very useful. It Is а double Microscope for ex- amining the wonders of nature. Opera Glass, a Stereoscope, a Burnin Glass, а Telescope, a Compass, & pocket Mirror, and a Laryngoscope—for examining eye, ear, nose and throat. It 18 worth all the cost to locate even one painful cinder іп the eye. Folds flat and fits the pocket, Something grent—you need one. Don’t miss It. Sent by mall. Only 35c or 3 for $1.00. PISTOL CIGARETTE CASE| It looks Ilke a deadly weapon, but 16 I9 merely a novel Cigarette Case, This clever contrivance E has proved itself better than the real thing In many ап awkward encounter. Great fun “sticking up" your friends, They squirm and protest it might be loaded. trigger and the slide files E open disclosing the ciga- rettes. Well made, light and compact. only 2 ounces. Jt ів also on Lens, a Reading PRICE У POSTPAID CROSCOPE and FLOROSCOPE COMBINES ALL THE POWER AND DEFINITION OF THE MORE EXPENSIVE MICROSCOPI NGLY GREAT MAGNI IMS IN WATER, CHEESE, GUGAR, ETC. "There are few things во interesting and valuableasa B ou to minutely exemine е specimena, to test colton, lk, seede, water, flour, cheese, milk, and in fact Unwholesomo mest can FYING POWER - EXAMINE GER! mineral anima} and vezetabl nearly oll articles of food. readily detected and ferments can be closely watched. It ie exceedingly interesting to examine the spores of ferns, вода, sugar, ealt, alum end other crystals, the dust (scales) from moth end buttery wings, h haire, flies and ineects, while the animaleulae in water are a never-foiling source of wonder. ing exporimente can be performed with an instrument Place a small piece of cheese іп в box and allow inseats to feed on it for в day or two. Then examine в tiny portion of the cheese under the Mi- сговсоре and you wlil see little animals, magnified to ou enn count their legs and the size of large beetles; ons or clawe upon each foot, the joints in them, the ta! also the hair or bristles upon their bodies. , some stagnant water; deposit n emal! portion of scum upon the object glaes of the Microscope with в pin's head, and you will see beautiful enimalculae swimming Bbout wilh ва much freedom es though they were fish in the boundless ocean. It is a truly wonderful sight d an endless source of interest and enjoyment for every . The Microscope is made of brass and is 2врађіе of magnifying 160 areasand although small and compact, It will cover в very wide range of microscople research. Price onl JOHNSON SMITH x RACINE, WIS. TELL YOUR OWN FORTUNE| WONDERFUL X-RAY TUBE A wonderful little instrument pro-|' ducing optical illusions both surprising and Startling. With И; you can see what is ej your Gogere, the lea rior opopiog in & pi: milar Шовіопе. P Ов, З for 25c. JOHNSON SMITH & CO. RACINE, WIS. Ned on receipt of 260. Only book of Its kind la ks in magic, the newest uzzies, g ring g d bco. toresiing books, our! les In soode and plaats, etc., unprocurable RACE WIS. isewhere.* Remit by Coin, M. - With the aid of this dream book and for- ji tune-teller. The key to your future. Will you be lucky in love? ness? Will you be wealthy? Complete with dictionary of dreams with descriptions and correct interpretations, with lucky num- & bers, fortunate days, oracles, divination, E Also tells how to tell fortunes by various methods, by grounds $ of coffee or tea, by dominoes, by marks, E * scars or moles, miscellaneous games with B weeks, months, years; how to receive oracles & by dreams, finger nail observations, etc. PRICE [0c postpaid. E FORTUNE TELLING BY CARDS! 64-page book tells how, Gives the meaning of each and every eard, how to deal and lay them cut. simple language. Successful In busi- Check or unused U. S., Cann- Everything explained in o } РАН ve. See nest page also. Гос postpaid. BOYS! BOYS! BOYS! HROW YOUR VOIC Into a trunk, under the bed, x under a table, back of the door, into a desk at school, or any- А4 where. You get lots of fun i fooling the teacher, policemen, , P peddlers, and Ed We and fool А “Топ ean ensily make a highly senaliive detectephone by БЕ this Transmitter. Dutton to сойо tha Bound waves: ou oan build your own outfit without buying expensiv: equipment, It б simple and inexpensive: You ean install all your friends ides, &n outüt in your home end hear conversations being hold ап over the house. You can connect up different rooms of a otel. This outfit was uscd by secret service pperaitives dure ing the ver. Jb is being used on the staze, Tt is ultra-sensi- ive and із the greatest invention in micro-pbones You can mount the button almost anywhere—-catd board Ботев, stoya ipes; tiff calendars, on the wall behind & picture frame, ete. Button is во lisht and smell it cannot be detected. Persona can be overheard without euspecting it, You can listen in on conversations im another room, А deaf person in the audience б is а little instrument that fits In the mouth out of sight. Cannot be can hear the sj er; Connected to phonograph; piano or A thi Ісаї inst: i Be di detected, It Із used in connection with the above, and with the fet away, Butten mon be und io renew telephone temer | aid of this wonderful DOUBLE THROAT, or VENTRILO, you ean sho mit» Th Ide! taltapbono for radio Gye: carrion bent | everything ior ONLY TEN CENTS 4 booklet elving you fal 1 ve, aan nde: ; зев: ever, g for h —a booklet giv you ful "usns Em з бз ea nrbe dtes d che Bateon pope bei instructions how to become a ventriloquist and throw your voice, experimenta along tha lines of telephones, amplifiers, loud speakers, eto, Many faeci- | the Double Throat, or Ventrilo, and our big catalog of novelties, ating stunts may be devised, such ns holding the button against the throat or chesb | tricks, puzzles, masks, books, etc. reproduce в b without sound waves. $5.00 is given to anyone who senda in a в taw Duegestlor for tho use of tho Button КЕЗҮН татаас find is suitable | AM Sent Postpaid to Any Address for Only 10c MAGICIAN’S BOX OF TRICKS for uso in their literature. PRICE $1.00 POSTPAID Apparatus and Directions for a Number of Mys» BLANK CARTRIDGE PISTOL ^ terlous көр. Enough for an This wel - = PRICES Entire Evenin: Entertainment....,...+> on the pattern е, A А T of the latest 4 AV Е i type km Re- I. fira las tricka, inelud- volver, the ap- В AN) pearance of which alone is enough = = ‘ Ecos the lid bal dies prasad and пров гы to scare a burglar, whilst, when someone elae's рос): The HINDOO loaded, Е will probably prove just TRICK CARDS (oan bem as effective as a revolver withrea NG bullets, without the danger to life. b вох gein, pi It takes the standard 22 Calibre : FEET tape pry m ARABS AO saa when the sup ü poprad eot ank Cartridges, that are cblainable most everywhere. + the coln bas vi Bod when tho water is poured on. Even the most timid woman can use it with perfect [ ys THE MOUTH TRICE to aromana dives Seppiy ot colored РАСТ, КҮТӨМ safety and frighten а thlef without risk to herself or B Qu ot [оок mouth); the ISAPPEARING HANDKERCHIEF (a handkerchief held anyone else, A Great Protection Against Burglars, CHANTED БООНУ таріаћеа); the WIZARD'S RING COIN TRICK; the EN- Tramps and Dogs. You can have it lying about without the danger at- | HAT AND DICE THICK i» lee Gre hy i Abio to make it lay domn); the GREAT tached to other revolvers. PRICE ONLY 50 CENTS. Better make found underneath, et no one has th the GREAT and supertor quality for $1.00. Blank Cartridges .22 cal., 50е per 100. LED TRICK Cowboy type Holster 500. Not prepald. Shipped Express only. Н hiak JOHNSON SMITH & CO., Dept. 919, RACINE, WIS. JOHNSON SMITH & СО. ` SILENT DEFENDER | BOY ELECTRICIAN ёт sette Bors. 106 PoF Students, Etc.—On Used by police officers, detectives, sheriffs, ч The HOW snd WHY of КОО fully told in simple language night watchmen and others as a means of À thet any boy can underetand. Scores of plans and inetructions for self-protection. Very effectlve. Easily fits Rho AL е пе “dry batteries, dynamos, electrio motore, telegruph apparatus, всей in ba: teleph: ‚ electrio ligh: ctrio di bells, al . ii the hand, the fingers being grasped in х Ne engine. rheostat. ma [uA сог ced e mations the four holes. Very useful in an emer- MA incandescent fash, electrio ehockinz machine, witeless telegraph i i apparatus, induction coil, arc light, current reverser, etc., eto. Жее Made of alominum they are very light, Ф) Tells all about electric wiring, stuile, electricity, magnets. and size always ready for instant use. Price 26c 4 Inagnetiam, conductors and insulators, electrostatio ine Eo HI EE ES д 2 "2 Gh duction, the ејесіговсоре, the eledtroph deneers, the igir аг, dynamic евр yoltaio cell, electromagnets, electrelysla, el receiving set for а few cents. Nearly 100 illustrations. Sent postpaid to any address on receipt of ONLY 10; coin or stamps. 250 MAGIC TRICKS For Parlor or Stage An excellent litile book contninlng nearly 300 E m à Am. 4 \ Tricke for parlor or stage. Tricks wilh cards, coins, Enjoy the concerta, baseball games 4 DU 4 handkerchiefs, esce, rings, glasses, flowera, thimbles, merket reporte, latest news, etc. ге, рроопа, bottlea, string. Explains the mystery of 180 Jokes and Riddles, 21 Puzzles and Prob- | М çopzrichted book EFFICIENT a р е floating head and scores of other amazing B v shows how ti р, , ч festa of magic and illusions, Aleo Becond Bight, jeme, Gypay Por tune Teller, 50 Money Mak, and operate inexpensive ‘Radio mene 9 Bhadowgraphy, еіс. So вітрів a child can perform VE Te Brite Posty, 1 Parlor Games, 16 the materials for which can be pur- н them. Profusely illustrated. ONLY 10о, Сега Tricks, 10 Funny Readings, 7] Toasts, | how to build a short-wave Кесеге \ Й 125 CARO TRICKS and sleight of hand. Соп" Out ots гог Checker аде, езе. Dgmi- |for bringing in foreign stations | Ù D tains ell the latest and best card tricks вэ performed police calis, ships at sea, etc. Wi à х Бу celebraied magiolans, with erposure of card iSe. postpaid“ 308 ete. ONLY Te tricka used by professional gamblere. Privo 299 REPEATING AND SINGLE SHOT = Que Wonder Crystal Radio Receiver $1 Al R PISTO LS P Say what you will about Electrical and Bat- Just what you've J &lways wanted. А ФАР T powerful hich grade M Air Pistol, shaped like &n Automatic, pocket eize. es B. B. shot obtainable апу» where; Very powerful yet perfectly safe grams. etc. All for іЅс. Postpaid. for simplicity and clearness of tone. There is absolutely no noise and no distortion—no bat- teries to buy—no tubes to wear out—no main- tenance expense whatsoever. Cost nothing to operate and will Iast indefinitely. Reception is . Two stylee—Binelo à loud and clear. This Receiver is guaranteed to Ere bd p ar The Repeater à 1 IBS 3 bp; Work equal to the most expensive Crystal Set fires 50 shoto in опе loading. „The Pinglo 2 i you can buy. Has a receiving radius of over Shot Pistol ehoote Air Rifle Darts in ad- iti durable; el] metal j 25 miles, or under favorable conditions up to dition to В.В. Be | Well made end oc, Front A [ 7 100 miles. Constructed of the finest materials EN Pe nev «епа орото спасем Better N ^T throughout: i Аршат super sensitive Ум. п Y Е 152.75, 50 j assuring quick results. PRICE of Receiver only ШИ Ке ны sss Net mah. e УСС with Bar Phone Н and Aerial Kit—everything all complete— able. Shipped by Express only. Not prepaid. nothing more to buy, $2.95 postpald. Send remlttance (Postage Stamps п в accepted) for all articles listed above, H SON SM ITH & C Dept. acine Wis also in our other ad on previous page " 919 y » Thank You for Mentioning Modern Mechanix and Inventions for February When Writing to Advertisers 25

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mazing Secret TRAFFIC in Here are two Chicago detectives examining arsenal of gangstet’s lair. The army type machine gun in the fore- ground was the principal weapon in the assassination of a couple of rival gangsters who were put "on the spot." Pump gun also makes effective artillery for close-up firing. 36 Headlines appearing with startling frequency in the daily papers attest to the efficacy of the submachine gun in gang battles. Photo shows how the Thompson sub-machine gun is held for firing from shoulder. If you are an honest, law-abiding citizen, you can't buy a sub-machine gun—but if you're a gangster you'll have no trouble. Theauthor tells here how the un- derworld carries on an amazing secret traffic in machine guns and other deadly weapons. by STERLING GLEASON OUR men walked down a busy city street. Except that their right arms hung rather stiffly at their sides, their ap- pearance would have attracted no atten- tion anywhere. Yet each man was literally a walking arsenal. Under each well-tailored coat, a Thompson sub-machine gun nestled snug- ly against the bearer’s armpit. The muzzle, only slightly protruding beneath his coat, was concealed in the palm of his hand. Close behind them walked two others— musicians, apparently. But the innocent- looking violin cases they carried held more machine guns. Each carried a round black drum loaded with 100 45-calibre bul- lets. In an instant these six men could have transformed themselves into a for- midable machine gun squad of terrible power. Modern Mechanix and Gang “DEATH @(ACHINES Above—All policemen of New York are put through a course of instruc- tion on the handling of the sub- machine gun. Instructor at left is demonstrating the swordcane, a weapon used in France about a hun- dred years ago. Insert at right shows the hundted-round drum which feeds bullets to submachine gun at the rate of 400 to 800 a minute. Drums may be quickly slipped into position for gang assassination. Such a miniature army might today en- ter your own town and open a reign of terror. An amazing secret traffic in ma- chine guns has armed organized crime in military fashion. With revolvers and pistols for light arms, machine guns for artillery, armored automobiles for tanks, and tear gas for poison barrage, criminal mobs become more formidable than an army. All this is made possible by underworld channels which distribute the weapons for the sake of an enormous profit. How do gangsters obtain these terrific instruments of death? Where are they manufactured? How are they distributed and sold? Recently the writer undertook to Jearn these facts. He found the amaz- ing truth to be that machine guns can be bought like so many sacks of potatoes— if you are known in criminal circles and have the money. An honest citizen might find it difficult to get one— but not a known gangster! Here is an example of how the system works. À number of sub-machine guns, or- dered in the name of the police depart- ment of a large city, were diverted by an Inventions for February At right is seen foot strap which holds barrel steady in short bursts of firing. Careful aiming is unnecessary with the submachine gun. Spitting 100 rounds in 15 seconds, the gun needs only to be pointed in the general direction of the victim. The recoil causes the bullets to cut a pattern of holes curving upward. 37

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Pull on Trigger of Submachine Gun Sprays 100 Bullets in Fifteen Seconds Crudely made but deadly, this "gas pipe bomb” was intended for home of a Chicago gangster who was muscling in on a rival's territory. Police officer is explaining its construction. FORE COOLING SIGHT AS Æ DECREASED PRESSURE DRIVES BOLT BACKWARD, AT FIRING: EJECTING CARTRIDGE LOCK, "HIGH PRESSURE OLDS. FITTED WITH 100 CARTRIDGE DRUM unscrupulous official to a firearms com- pany in which he had a financial interest. When detectives checked .up, the dealer said that all records had been lost, and that he could tell them nothing., Police did not doubt that the guns had passed into the hands of criminals, but lack of legal proof tied their hands. a This episode was followed by a series of robberies in which machine guns were used. Soon afterwards, a carload of rack- eteers overtook an armored truck, opened a withering stream of machine gun bul- lets on the wheels, cut them out, and over- turned the truck. When the crew foolish- ly came out to give battle, they were shot down and a large payroll stolen. Modern machine guns are of two types —the machine gun, and the sub-machine gun. The machine gun, proper, is a large weapon, weighing, complete, several hun- dred pounds and requiring a tripod mounting. Its ammunition is generally of 38 One of the chief advanta that it can be concealed beneath the coat, as illustrated at the left. Drawing above shows the construction of the deadly submachine gun. Operatéd by recoil of the shots, the gun literally sprays a victim with bullets coming out almost end to end. Cartridges of .45 caliber, almost a half inch in diameter, kill instantly. ges to gangsters of the Thompson submachine gun is 30 calibre, although .45 and .50-calibre guns are in use by the Army. The bullets are fired from belts or drums. The sub-machine gun is smaller, lighter, and requires no mounting. It is the prin- cipal weapon of the racketeer. Rapid-fire guns today are operated by ihe recoil of the barrel or the back-pres- sure of the powder gas. The Vickers, Browning, Maxim, and the Thompson sub- machine gun, are recoil-operated; the Browning auto-rifle, Hotchkiss, and Lewis machine guns are operated by gas pres- sure. Because of its large size and weight, the ordinary machine gun is used almost exclusively by military authorities. Gang- sters prefer the Thompson sub-machine gun. If you study this weapon, you will realize what a terrifying thing it is, and understand its power. Short, stocky, light enough for one man to carry and use, it is in reality an automatic rifle which will pour out bullets at the terrific rate of 400 Modern Mechanix.and Drucci, Chicago Gang Killer, Used Submachine Gun, Sawed Off Shotgun to 800 per minute—spitting them forth so fast that they are almost end to end. The ammunition is .45-calibre—giving ihe gun greater “stopping power" than any other ordinary machine gun or rifle. The impact of these heavy slugs will in- flict a terrible shock that stops the strong- est man immediately. Traveling at from 850 to 900 feet per second, the .45 bullet carries a muzzle- energy of 430 foot-pounds. At 300-foot range, it will penetrate white pine to a depth of 5% inches. Not only the force its bullets deliver upon impact, but its rapidity of fire, makes the gun so deadly. A 100-round drum may be fired in less than fifteen seconds. Pump 100 lugs of lead, weighing more than three pounds all together, into the delicate parts of the human body, and you will put any man out of commission. Accuracy of aim is not a strong point of the sub-machine gun. “It doesn't need to be accurate," one detective told me. “This gun puts out the bullets so fast they almost run over one another. You don't put the gun to your shoulder and aim it, like a rifle. You just hold it at your side, point it in a general direction, and spray the mark with bullets. It's just like using a garden hose. The recoil lifts the muzzle and kicks it to the left, so that the gun cuts a pattern of bullet holes that curves diag- onally upward. Nothing could live in that line of fire.” Although a tremendous power in the hands of the gangster, the machine gun is useful to police chiefly as a threat. Ruth- less gangsters have no objection to turn- ing a machine gun loose on the street, shooting down women and children with- out compunction. Such an occurrence has taken place in New York City three times within the past six months. m Policemen, however, will not fire into a crowd. Tear-gas is more effective and does not permanently injure. Only when a des- perate criminal is barricaded in a house, for example, can the machine gun be used freely by police. "I have frequently used the sub-machine gun for personal protection," said one de- tective lieutenant whose work brings him into constant contact with gangsters. *For this purpose, a Thompson gun, plus a tear- gas ‘fountain pen,’ is ideal. “Recently I had to bring in a big beer baron who had just come to town and was wanted by police. A known killer, he was always accompanied by а heavily-armed bodyguard. “When I called at his hotel room, I car- ried the ‘typewriter’ in my hands. Aiming it straight ahead of me, I kicked the door open. When the beer baron and his body- guards saw the ugly muzzle of the ‘chop- per,’ they raised their hands skyward in a hurry. No man cares to argue with one of these babies.” 2 Police instructors are here seen showing policemen how a gunman conceals his weapons and how to perform the frisking act. This dummy is wear- ing a bullet proof vest. Right—Some of the weapons found in the arsenal of Schemer Drucci, Chicago gangster, famous for his ability as an execu- tioner. The submachine gun and the sawed-off shotgun were his favorite weapons. Left—The .30 and .45 caliber bullets. Inventions for February 39

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eMAKEUP SECRETS of Movie HO In transforming Karloff into a mummy, Pierce encountered greatest difficulty in making up the hair, On top of a layer of liquid grease paint, which acted as a base, was patted a mix- ture of beauty clay and fullers’ earth, which was then dried. by JAMES BOWLES ВОМ the depths of an ancient casket a bony and shriveled hand stretched back across history thirty-seven centuries to snatch a scroli from а terror-stricken actress. Deep, gray lines of age streaked the hand. Dust fell from ancient fingers. Yet it moved, actually grasped the parchment, and disap- peared from the screen. 44 This terrifying scene trom "Im-ho-tep" shows Karloff as he appears in his mummy makeup—an exact duplicate of real mummies found in ancient tombs. In photo at top Pierce is seen applying the first layer of makeup—cotton and spirit gum—to Karloff’s face. Outside the camera angle sat Boris Kar- loff. It was his hand whose antiquity the camera revealed, a hand “mummified” earlier in the morning by Jack Pierce, movie make-up expert, who recently pro- duced a living mummy in the person of Karloff, complete in 1500 feet of rotted cloth bandages, wrinkled skin, closed eyes and the yellow hair of a person dead many centuries. The “mummy” represented the latest FACE CUM ^ rs First step in "mummifying" face was application of special gum; second, plastering skin with layer of glue and cotton. Modern Mechanix and When you shudder at the sight of fright- ful characters in horror movies, it is usually the makeup man who is responsi ble for your thrills. Read here how he creates actors that terrify you. R Pictures bony shriveled Boris Karloff, the sealed eyes. achievement of the movie make-up artists, who strive constantly for new and novel means of bringing striking figures—living and dead—to the screen. On three differ- ent occasions Pierce turned Karloff into either a part or a whole mummy, counter- part of the first mummy ever created. Few persons realize that mummy-making combined science and art among the Egyptians. Pierce searched thirty-five vol- umes of Egyptian history in his quest for authentic background for this bit of make- believe. “Who,” he asked himself, “was the first man mummified, what was used, how SECONDSEAYER: ‘OF ЕАСЕ BUM "Third step: Second layer of gum is brushed оп cotton to preserve wrinkles. Fourth: Grease paint applied to cheeks brings out high lights before the movie camera. Inventions for February Above-—Jack Pierce, expert Hollywood makeup man, giving pearance to hands of em- ploying all scientific devices of his art. At left is seen Karloff ready to appear be- fore the camera. Note carefully the matted, mud-encrusted hair, the wrinkled blood- less looking face, and ap- То provide last word in realism, Karloff, for his appearance in the movie story of Egyptian reincarnation, was wrapped in shroud of charred cheese cloth, which was later brushed over with caked mud. In the filming the mud crumbled off when mummy rose from its ancient coffin, coming to life after some 3700 years. was he wrapped?” All the information he could dig up gave only a suggestion, not a solution of Pierce's problem in turning Karloff into a duplicate of Osiris for *Im-ho-tep," in which picture the mummy comes to life. Manifestly em- balming fluids and perfumes have no place in makeup for the camera, so for a month Pierce experimented with pigments, paints, drying materials. He had to have a rotted cloth that would not fall from the body, yet would crumble easily when the body stirred from its coffin. The face must look very old and withered and dry. The eyes must be closed, yet seem to see. An assistant spent a week feeding double- weight cheese cloth in two widths—two and three inches—through a barrel-like cylinder over a gas flame; winding it gently over a turning wheel. This cooked and 45

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Movie-goers Love Weird Characters— "Frankenstein" Big Money-maker Makeup man at work comb- ‚ ing out wig on special “рїп,” Silk milling gauze makes hair. You remember that thriller “Frankenstein.” Here Pierce is at work making a monster out of Karloff. ur D When characters in a movie are seen to grow old in the story, the makeup man is the one who applies the aging process. Here makeup expert is painting on lines of age. eun the cloth without actually burn- ing it. Pierce experimented with 20 dry colors until at last he looked down into his mixing pot on exactly the yellow-gray color with which good mummies are covered. Burnt umber, light umber, fullers’ earth, other colors, glue and hot water combined to produce this mud-like substance. With a little cotton and the standard make-up pig- ments Pierce was ready for the big job— a seven hour ordeal—of turning back the pages of time 3700 years, all for a five-min- ute effect on the screen. . 46 Here's an unusually delicate job for the makeup man— "growing" a beard, hair by hair, on Erny Westmore. “Wrapping Karloff,’ Pierce told me, *was the hardest job Ive faced during twenty years in the motion picture busi- ness. Cooking the cloth gave it the appear- ance of cloth that had rotted under the earth, but it had become so fragile that it sometimes fell apart in my hands. “Yet it was necessary to wrap himinthree directions—around, vertically and diagon- ally—so the layers would not separate and reveal his skin. Despite these three layers, when he opened his eyes and moved from his casket, the outer layer crumbled like a thick layer of caked mud and disappeared in a small cloud of dust.” Caked mud really covered the bandages, having been brushed over the cloth. The glue held it together after it had dried, the water gave it the necessary moisture to permit working the colors. Yet the startling and grotesque effect came not so much from the decayed appearance of the body, as from the hands and face. Here was a triumph of movie makeup, as great as any Modern Mechanix and Makeup Men Can Change Race of Actors, Even Make Over Elephants Movie makeup men can even change the race of an actor. George O'Brien, the actor at the left, has been made up to look like two Indians, from whom he can't be distinguished. Right—By addition of large ears an Indian ele- phant has been transformed into an African elephant for “Tarzan.” ever attained by tbe immor- tal Lon Chaney. Pierce first brushed Kar- loff's face with a special gum, a secret formula, that retained its moisture so long as the makeup remained on the actor. Over the gum he plastered a thin layer of cot- ton, specially prepared for this typeof work. After the cotton had “set” in the glue, with a pair of tweezers, Pierce pulled out the ex- cess, leaving little valleys where he planned to create the lines of antiquity. Thirdly, an- other layer of gum was brushed on the cotton, this to hold the outside in exactly the same position as created by the tweez- ers. While the face was drying under the hot blast of an electric heater and fan, Pierce turned to the hands. The same pro- cess served here. Actor’s Face Made to Look Dead Having destroyed all life in the face—in fact, having quite obliterated its human re- semblance—Pierce found he must restore something of a human quality. A layer of ordinary grease paint supplied an appear- ance of skin and normal pores and enabled him to deepen the lines in the cotton with a dark brown pencil. This accentuated the deep crevices. Now a lighter shade of grease paint, spot- ted on the cheeks, brought out the m lights and depths so essential for the camera. Technically the most difficult problem came in making up Karloff’s hair, for Pierce found he must turn the natural black into an aged yellow. No wig would do here. Inventions for February -— Recognize the actor above? It’s Jean Her- sholt in a distinctive makeup — in fact, a masterpiece of the makeup man's art. Note tousled hair, furrowed face, scraggly beard. To determine whether any flaws will register on the film, cameraman must study makeup of characters through his blue glass, as demonstrated here. Nils Aster is the actor. A layer of liquid grease paint, neutral in color, supplied the base. On top of this was patted a mixture of facial beauty clay and fullers’ earth. All of which transformed the top of his head into a dirty matted yellow, exactly as the hair on mummies found in recent years looked after nearly forty cen- turies under the earth. Final touches for such an exacting make- up are applied after the actor reaches the great sound stage. There Pierce completed wrapping Karloff’s legs together and sealed his eyes closed with rice paper, leaving a little horizontal valley in the center of the (Continued on page 145) 47.

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Engineering GENIUS Sights Striking photo above shows how an avalanche swept a path through a wood on the slope of a mountain. * ` These denuded and splititered trees are part of the wreckage rom an avalanche wind, generated by the displacement of air in the front- -of a snowslide. Such winds reach forces greater than hurricane. Entire villages have been devastated by avalanche winds, though untouched by snow. 54 "The aftermath of a snowslide which occurred at Bingham, Utah, in Feb- ruary, 1926. Rescuers are seen dig- ging out victims of the avalanche. The avalanche, nature's most destructive mons- ter, now submits to the intelligence of modern engineering genius, whose methods of con- trol ate explained here. by CALVIN FRAZER 66QNOWSLIDE Hits Train; One Dead, Four Missing.” “Colorado Snowslide Buries Four Miners.” “Twenty-one Italian Soldiers Killed by Avalanches.” “Thirteen Ski Tourists Perish in Avalanche.” These four headings were selected at ran- dom from a large collection of newspaper clippings, all of recent date, relating to dis- asters due to the terrific cataracts of snow that sweep down the steep slopes of moun- tains in all parts of the world; often with dire results, though fortunately the vast majority of these slides are harmless, either because they occur in unsettled regions or because various protective measures against them have been taken by mankind. People who live in non-mountainous re- gions may think of the avalanche as a some- what rare event. It is true that destructive. Modern Mechanix and the “Destructive “Avalanche avalanches do not occur every day, but those that have no serious consequences and hence fail to get into the newspapers descend the mountains of the globe by the millions in the course of a year. It is easy to see why this must be so. A mountain, because it projects up into the colder regions of the atmosphere and especially because it forces the winds that blow against it to rise, cool by expansion and shed their moisture, is a great collector of snow as compared with the surrounding plains. Of the snow thus gathered part is removed by evaporation, part melts and flows down as water, and part, gradually compacted into ice, creeps slowly down in the form of glaciers. Some is also blown from the peaks and higher slopes by the winds, but a vast amount remains lo be removed by the speedier process of the snowslide or avalanche. Roof Slide Is Small Avalanche If youlive in a snowy part of the country | you will probably witness avalanches on a small scale this winter on sloping roofs in x your vicinity. The snow may become hops how tertific saturated with water until, no longer able are created. In to adhere to the shingles beneath, it slides Switzerland, a off and thuds to the ground, or again, in pte cime colder weather, it may remain dry but precautions must eventually accumulate in such quantities be taken to guard that some slight jar will start it down. EAE avalanche The same two varieties of avalanche fight shows rows occur in mountains. The former is called a of stakes driven “ground” avalanche, and is commonest in into the ground to spring; the latter, known as a "dust" ava- break up and te- lanche, is confined mostly to winter and consists of dry, powdery snow, great clouds How mountain winds pile up, snow to huge depths on mountainsides. Drawing above tard snowslides, Жа On mountain railroads both in Europe and America, tunnels and snowsheds such аз the one shown above furnish a partial protection from the unstable snowfields. Avalanches descend upon roof, leaving tracks clear for fast trains. Construction of sheds must be substantial and bracing secure to withstand the crushing fury of thousands of tons of snow. Inventions for February 55

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Jew automatic baby feeder that may be ad- justed to any height on Above—Rell on bottle of dan- = ib by si i gerous medicine rings warning. : : Jic тен eie E d Right—New air-tight rubber : Е ere's the new '"Tell-U-How bottle stopper which seals bot- This new contrivance at- taches to a milk bottle and converts it into a convenient little pitcher for the dining table. At tight is seen Mr. “Picka- doodle,” who bends down and with his magnetized beak picks up pins or wire clips. His feet are springs. cocktail mixer which shows you Че CE Eee sen h " h rape jui ce ingredients for your favorite ps grepeguicen ee drinks, and measures contents. Housewives with gas stoves will welcome this new sandwich toaster recently put on the mar- ket. It consists of two plates between which the sandwich is placed for the toasting. Manu- facturers claim the job is done in one-third time taken by electricity. A new kind of cover loosener is now The square base sets over the gas . Ideal for small apartments is a small elec- Latest aid to milady’s beauty is this . E available in the form of a soft rubber burner in the toasting process. Note tric washer now on the market which prepares "Kurlasher" which curls the lashes to ke ring made to slip over fruit jar covers. It the ingenious ball joint for reversing the ‚ the washed clothes for the line without the use of a make eyes more attractive. No heat as a series of tiny teeth-like grips which plates. Wooden handles give adequate in- „Wringer. Concealed in the top is a soft rubber bag is required and the device is entirely : К obtain an extremely firm bold on the cover sulation against heat from the flames. which is expanded by water pressure to wring clothes. harmless to the user. and loosen it immediately without straining the wrist. 62 Modern Mechanix and Inventions for February 63

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Master These Strength Tests Here’s a way to test atm strength. Grasp hands firmly, with elbows placed on table top. At word “go”, try to force opponent’s hand to table. One of the best party stunts imaginable is this balanc- ing test with arms locked and one foot held off floor. "This is a novel method of wrestling which brings into play the muscles of the arms and back. Assume the back-to-back position with knees raised close to chest. Arms аге locked with those of your opponent. Fun galore may be had with this "foot boxing" test. Clasp hands underneath upraised leg and place toes to those of the opponent. Push with toes and try to force opponent off balance. First to unclasp hands is the loser. Plenty of exercise in this, besides testing leg strength. Frequent spills of contestants make this an excellent party game. A little practice will enable you to win easily. 66 Here's how you work the stunt shown at left above. 'The idea is to upset the opponent from his seated position on the floor while retaining the back-to-back position. It is possible to stand an opponent on his head. O YOU want to compare your strength with that of your friends? If you do, here are eight different methods, all simply executed, that will bring into play every muscle of the body. Master these feats and you can hold your own with men of much greater bulk, because they will have failed to develop the distinct muscles brought into use in each of eight separate tests. The first known use of one of these meth- ods, shown in extreme upper left hand cor- ner, dates way back to 1849 when a grizzled miner challenged a “dude” Easterner while both were partaking of liquid refreshments in a California saloon. The *dandy," hav- ing practiced the feat before, offered it as a test. The struggle lasted well over an hour while the two men tensed and flexed their muscles, perspiration pouring from Modern Mechanix and OUTDO Mightier ©pponents This ‘stunt is similar to the one shown in the upper left hand. corner of opposite page except that contestants are standing, with knees touching. Another good party stunt, one that requires power in the arms, is shown in the two views above. Participants sit on the floor; legs upraised, toes touching and hands clasping. At a signal, they exert all of their strength in an effort to lift the epponent off the floor. If two persons of nearly identical strength take. part, the tugging is fast and furious for some time. з Е Participants stand with knees together and right arms grasping each other's elbows. The left hands are held behind the back. It is usually quite a struggle before one or the other of the two contestants is pushed off balance. determined faces. Strangely enough, to the onlookers but not to the Easterner, the miner was finally overcome. The winner had developed his arm muscles and knew how to use them to the best advantage, something neglected by the miner. Master these tests and then introduce them at your next party. You will be sur- prised at the amount of fun derived by the it. Hold your hand atop your head and ask anyone to participants as well as the onlookers. Most lift it off. If you are of equal height or taller than the of the guests will not be familiar with them, ltem" he must take the position shown. The strength 5 in your arm will be sufficient to withstand the strength in and so will meet on equal ground. both his arms, due to the extremely poor leverage. Inventions for February 61 This stunt is the only one that has a trick connected with

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SNOWFLAKES Ame &Masterpieces of NATURE 1 In this record precipitation in Chepstow, England, two inches of snow fell in two minutes. F YOU have seen snowflakes an inch, or even three-quarters of an inch, across, come fluttering down from the clouds during a snowstorm, you have witnessed an interesting spectacle. However, you need not feel too much elated for, as the saying goes; “You ain’t seen nothin’ yet.” Sometimes the pearly gems of frozen moisture come down in such sizes that a single snow- flake will cover a good-sized saucer. : Sounds fishy, doesn't it? Nevertheless, it is no fish story. Such phenomena have been witnessed and recorded by reliable scientific observers in various parts of the world. E. J. Lowe, of Chepstow, England, reported three such cases. One was in January, 1838, when the largest snowflakes were about 2 inches jn diameter; one was on January 7, 1887, when the largest snow- flakes were more than 4 inches in diameter; and the third was on March 24, 1888, when the largest snowflakes were nearly 4 inches in diameter. So far as can be found the 5-inch snowflakes which fell at Nashville, Tennessee, on January 24, 1891, were the largest real Few of the myriad fantastic geometrical shapes which snowflakes assume as they fall from winter skies are shown in these artist's drawings. These flakes may be perfect, single snow crystals; as, for instance, during the beginning of a snowstorm when the air temperatures are well above freezing. More often, however, they are groups of several partly meltéd snow crystals which have come together and adhered to each other during their journey through the clouds. Note that all the patterns are six sided. Being minerals, snow crystals follow the laws of crystallography. 70 Modern Mechanix and Take a good close look at a snowflake some of these days and you'll be surprised at what you see. Geometrical patterns that no artist could design will greet your eyes. This fasci- nating story will tell you some astounding facts about these snow- flakes—how they are formed and how they sometimes attain to gigantic sizes. Maybe you won't believe it, but snow- flakes five inches in diameter, almost as large as a saucer, have actually come down out of the skies. This phenomenal occurrence was recorded at Nashville, Tenn., on January 24, 1891. Gigantic snowflakes are simply masses of snow formed by the collision and adherence of many small snow crystals. Two or more of these crystals unite near the cloud level, forming a large snowflake which intercepts others as it falls to the ground, gradually becoming larger on its way earthward. Due to air friction, edges curl up causing saucer-like shape. snowflakes which have been authentically recorded up to the present time. Gigantic snowflakes, like those that fell at Chepstow, are simply masses of snow formed by the collision and adherence of many small snow crystals. Two or more small snow crystals unite near the cloud level, forming a snowflake somewhat larger than its neighbors. This snowflake intercepts others as it falls toward the ground, gradually becoming larger and larger on its way down. Due to the friction of the air, which tends to retard the falling motion, the edges of the snowflake often curl up, causing the characteristic saucer, or plate-like, shape. Although the terms “snow crystal” and “snowflake” are often used synonymously, there is a real distinction between the two. Snow crystals are formed when the invisible atmospheric mois- ture condenses during air temperatures below the freezing point. One interesting thing about snow crystals is that they are always six pointed or six sided. Snow crystals are minerals, just as diamonds are minerals. Consequently, when moisture condenses into snow it follows the laws of crystallography, just as other minerals do. Mineral substances crystallize during the solidification process whenever the molecules are free to move about and arrange themselves according to mathematical laws. In the case of snow this arrangement is always hexagonal or six sided. Anyone who has ever thrown snowballs knows that it is only the damp snow particles that cling together when their surfaces come in contact. Cold, dry snow crystals do not adhere when they collide. Inventions for February Here are few more more shapes which flakes assume. These de- signs often provide artists with patterns for dresses, etc. 71

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Artificial Radio SIGNALS ‘each Blind Flying Safely N INEXPENSIVE and compact device for iraining flyers to pilot planes by radio beacon and to effect blind landings has been perfected by Lieutenant Carl J. Crane, Randolph Field, Texas, flying in- structor and noted authority on blind aerial navigation. Under actual flying conditions the in- vention has proven successful in both Army and civilian tests. By simulating radio beams, the newly perfected device is used to work out al- most any problem in connection with fly- ing by radio beacon or making blind land- ings by means of electrical signals emitted from the airport of destination. Construction of the Instruments Seated in the open cockpit, the flying instructor has before him a panel (about 5x7 inches) upon which are mounted seven switches and three dials. The in- structor and his blind-flying student, who operates the controls of the plane under a sight-tight hood in the other cockpit, are connected by a telephone into which the ieacher advises his pupil throughout the course of instruction. Here are two army flyers demonstrating the new blind flying instruments. Student (at left) watches dial shown in inset The only instruments necessary for the student are a set of earphones and a small dial with two pointers, swinging from pivots on the.right side and the bottom, which cross at right angles over the cen- ter of the dial. This indicator is used in training the student in the Department of Commerce method of making blind land- ings. How the Device, Operates In this method, a system of energized circles around íhe center of the airport emits radio signals which move the point- ers of the dial. The vertical pointer, show- ing the course, and the horizontal indi- cator, which points out the “too-high” or “too-low” position of plane, are both operated by the instructor. *Although blind landings for regular commercial or military planes are still in the experimental stage, it will not be long before all pilots will be able to qualify in the new art, just as they will soon be re- quired to make their mark in flying blind," Lieutenant Crane declared while being in- terviewed by the MODERN MECHANIX AND INVENTIONS representative. to learn whether he's-off course. Instructor at right operates control dial (shown below) to show student direction ship is flying with relation to landing field. Instructions are given through the mike—Photos courtesy U. S. Army. Air Corps. 72 Modern Mechanix and HOW VISUAL INDICATOR GUIDES BLIND-FLYING STUDENT APPROACHING A LANDING: MOVEMENTS ARE EXAGGERATED FOR THE ЗАКЕ OF CLARITY TOO HIGH т TOO LOW: (NEEDLE POINTS ERROR) > PLANE HEADED FOR CENTER OF FIELD ~ NEEDLE AT. OFF COURSE TO LEFT TO RIGHT. NEEDLE POINTS ERROR. Radio beacon signals, by which the stu- dent knows whether he is on the course or to the left or right of it, are also simu- lated on the Crane Beacon and Blind- Landing Trainer. When the instructor sees the student is keeping on the predetermined course, he throws the “T” switch which causes a miniature coil operated by a motor to sound a long dash at regular intervals in the pupil’s earphones. Should-the student get off the route to the right, the man be- hind the panel in the open cockpit imme- diately sounds the “N” signal (a dash and a dot) until the airplane is headed back Inventions for February ЛАГ CONTRE IMULATE| RADI INSTRUMENTS Artist's drawing above shows how blind flying instruction instru- ments are installed in cockpit of plane. Student in front is hood- ed, while instructor sits in rear at control panel. Drawings at left illustrate how dial pointers indi- cate deviation of ship from course leading to landing field. Student steers plane as if needles were being actuated by energized cables from air field. When the instructor sees the student is keeping on the predetermined course, he throws switch which causes a long dash to sound in ear phones. Should the novice get off course to the right a dash and dot sounds, to left, a dot and dash, until the ship's nose is pointed towards the runway. These signals duplicate those heard from airway radio beacons. Lieut. Cari J. Crane, of Randolph Field, Texas, is the inventor, GLIDING ANGLE О.К. NEEDLE IN CENTER. OR ZERO POSITION. ZERO: in the correct direction. Should the plane assume a position left of the prescribed course, the instructor switches on the “A” signal, a dot and a dash, until the ship’s nose is pointed to- ward the “airport.” The three remaining switches on the panel also serve to orien- tate the flyer as he comes in for a blind landing. Lieutenant Crane's invention is expected to be hailed by all airport executives as an ouster of expensive ground equipment and to permit blind flying and landing in- struction at every out-of-the-way Army and civilian airport. 73

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SBUILD d (2OMEDY F^. Good money can be made at catnivals and in advertising stunts for local merchants with a sawed off bug made from Model T Ford parts. This article de- scribes the changes that are necessary for mak- ing the entire conver- sion, ready for use. The top five leaves of the front spring are removed, and inverted. They are placed on the bottom of the spring pile. This lowers the car forward (leveling with rear axle) furnishing a stout shock absorber so that— N ATTRACTION that is sure fire always makes a good advertising medium. This converted Model T Ford, or Comedy Ford, can be very easily built, and is a profit maker for any man who has a litile ingenu- ity in selling its uses. It can be used to carry labels, or to give thrilling joy rides about town, or to provide a freak set of thrills on any country fair race track. By this conversion the cénter of gravity of the car is brought so near the rear axle that with two men in the little buggy it can be made to run for quite long stretches on the two rear wheels. Sudden starting makes the front end rear up and act jack-rabbity. 80 Here's the way the М Ford touring car looks when finally com- pleted. The fenders are missing and the whole job has been lowered. when the car is suddenly started and the front end rears up the lowered and inverted forward spring leaves act.as a strong absorber for drinking up the dropping shocks. The size and odd appearance of the car make it the center of attraction, and really difficult problems in parking are so amaz- ingly easy that much comedy is given to all onlookers. Like Charlie Chaplin, the car is funny just to look at. The elements from which this car is made are simple. You'll need one usable Model Т Ford touring in running condition. Remove the body and cut it in two with tin snips right behind the front seat. That is step number one. Next, remove the rear wheel assembly, axle and all, and discard the spring and shackles. Then move the axle forward, and weld in a short piece of drive shaft in place of the long one just discarded, seeing that the end of the universal housing and the bearing on the axle are as close together as it is possible to get them. i Modern Mechanix and СЈОКр. е Pillow blocks of 2" by 4" stock are placed between the frame and the axle on both sides of the frame, and long U bolts of %” cold rolled steel are bent and threaded and a clip plale fashioned so that the axle may be bolted to the frame. Then the frame is hack sawn off right “abaft” the hold down bolt holes for the body. The radius rods are separated and the ends welded to the sides of the frames. That completes the rear end. The front end is very simple, needing but few changes. The main idea is to get the whole frame lowered so that it is more on line with the springless rear wheels. Since the rear wheels are now carrying more of the load than the front, the spring forward can be much less strong and still be plenty heavy. The first five top leaves are removed and inverted, and then placed in the bottom of the spring pile. Thus when the car smacks down to earth after one of its spec- tacular *rarin's," this inverted spring cush- ions the shock. The exhaust is led out through an ex- tension of flexible metal hose. The body is put on, and bolted down. The matter of marketing the services of ihe car is not difficult. А call to local merchants will soon show you what they are willing to pay for a sign of a comic nature on your car, and by changing the car's literary cargo each week, you will keep the turnover steady. A matter of giving “jitney” rides is a sim- ple affair in most cities. Put a sign on the car, 5c a ride, and show it doing some of its bucking tricks. Several dollars a day can be.earned in an active, well populated com- munity. County fair concessions can be ascer- tained by writing the state bureau at your state capital, through the secretary of state. г cx 22 The center of gravity is so near the axle that when car suddenly starts the front end goes jack-rabbity. frame. The photo above shows the muffler tucked ша right angles, U bolts over rear axle, and sawed off Above is shown the way the rear axle is moved up against the universal joint on the motor and how the radius rods are led forward to the frame. Left, how pillow blocks and U bolts fasten the axle to the Írame. No rear springs are used. Flexible metal hose is used for exhaust pipe. Radius rods are welded to the frame alongside the motor. The body is bolted back.on the frame. The floorboards and all present equipment will fit the altered job. Showing dropped front end with spring pile reversed, U bolts holding axle to frame, and exhaust. Inventions for February 81

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Bring “Ghosts” to your Home CONICAL TUBE MADE OF HEAVY PAPER DIAPHRAGM — TOY BALLOON RUBBER HELD BY EMBROIDERY HOOPS ГД "в woop pisc WITH Ma" БҮЛЕ HOLE LINED Construction of gun which shoots invisible, clammy rings of ice-cold carbon dioxide gas, which feel like ghostly hands. HEN Eddie called me up from the “Times” office, and asked me to come along to Madame Y’s “Wednesday night circle,” of course I accepted the invitation. For over fifteen years I’ve been spook hunting, but with no material success. When spooks have rattled tin cans in a cabinet in imitation of a “Model T," Гуе always found that the spooks had bone and muscle. When nebulous images have ap- peared on photographic plates, I have always found-the foggy patches due to ex- posure to X-rays, radio-active salts, or maybe to a tiny pin-hole in the bellows of ihe camera. Eddie is a reporter on the “Times.” Nosing around for copy, he had visited 82 ll d d uc ИИИ 1 The author demonstrating how the gas rings travel. Incom- bustible carbon dioxide is here extinguishing candle flames. by RICHARD COKE The author's adventures as a “ghost detective," ferreting out the secrets of fraudulent mediums, led him to the discovery of the ingenious methods of creating phantoms which he describes in this article. Using these simple stunts, much fun can be had at house patties, and you can easily convince your guests that you are in private communication with the supernatural. Madame Y’s the week before. What he had seen had him absolutely mystified, so he got in touch with me to see if I could dope it out. He declared that ghosts were all over the semi-lighted room; actually brushed against him, enfolded him! We arrived at Madame Y’s. It was a big, gloomy, frame house out on Santa Monica boulevard. It was a few doors from a cemetery. I couldn’t help but think that “Madame” was a good business woman: she kept her ghosts close at hand to avoid cross- town taxi fares. At the door we encountered the usual “spirit seance” atmosphere — a dark- Modern Mechanix and ` type used by the fake medium. for ‘WINTER “PARTIES Above, a gas ring mortar of the Layout of Madame Y’s seance chamber is shown at right; chaf- ing dish dispenses vapor which supplies humidity to make visible the cold gas rings sent into room by confederate upstairs. Geo- metric patterns camouflage open- ings in ceiling, skinned, loose-robed confederate, who admit- ted us and ushered us into a big room decorat- ed after the motif of grandma’s crazy quilts. The ceiling met the walls in a sweeping curve. Both were paint- ed, in a variety of sizes, with the three most common geometric fig- ures: circles, triangles, and squares. A fairly wide table about ten feet long, and covered with a green cloth, was located in the middle of the room. There were six straight-backed chairs at each side of the table, and two at one end. At the other end, on a slightly raised platform, was an armchair—the “Madame’s.” I noted partic- ularly that the chairs, and all the woodwork about the room, were finished in dull green ‘and offered no reflecting surface. The lighting effect was very unusual. Above the table, and about two-thirds the way between the floor and the cciling, was a long, green, neon light tube. A semi-cir- cular shield above the tube cut off all the upward beams of light, but diffused the lower part of the room with a sickly, green glow. Before the actual “seance” started, several floor lamps about the room were alight with conventional white bulbs. On a small table in a corner near the “Madame’s” chair, was what appeared to be a re-designed electric chafing-dish—I noted an electric cord leading to the device. It was emitting a spicy-smelling vapor. The Inventions for February Demonstrating how the gas ring mortar sends a halo of dry ice generated gas settling over the shoulders of subject. atmosphere in the room was very humid, oppressive. So much for the physical surroundings. There were about ten persons in the room, mostly women. Also two half-baked- looking males. (Not including Ed and me). Suddenly an awed silence. “Madame” swept into the room with ill-cultivated grace, and wedged her portly form into the armchair at the head of the table. The "circle" was called to order. The word “circle” struck me kinda funny. Why not call the meetings the “Wednesday night rectangle?" After we all were seated, *Madame" went through a lot of superfluous palaver, lead- 83

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CHELPFUL JDEAS for the Non-frosting Windows With winter upon us, the seasonal neces- sity of enduring frosted windows or those which steam up when cooking is done is with us again. This annoyance can easily be done away with by purchasing twenty- five cents’ worth of glycerine from your drug store. Apply this to the glass with a rag. The thin coating it leaves offers no surface for moisture to accumulate upon. Drying Shoes With Light Bulb Wet shoes should be dried from the in- side rather than by baking in a hot oven, which always results in such damage to the leather that its useful life is cut short, though the owner may not be aware of it. A ten-watt electric light bulb placed direct- ly inside the shoe, as shown above, makes an excellent drying medium. Higher pow- ered bulbs should not be employed, for they dry out the leather too quickly, with dele- terious results. 86 Repairing the Gas Range Cleaning gas burners generally restores the efficiency of the kitchen range. The burners should be removed, carefully brushed and scraped, and darning needles run through each small aperture. Then the burners should be boiled in sal soda. They should be carefully dried by heating before returning to place. If the pilot light on your gas range gives continual trouble, cut a hole about three- quarters of an inch across in the top of the cap which covers the pilot. If you suspect a gas leak in the house lines, make sure that all gas cocks are turned off, then watch your gas meter. ЇЇ any of its hands move, begin looking for the leak. Removing Glass Stoppers This melhod of removing stuck glass stoppers from bottles is one of the most efficient known. A heavy copper wire is wound around the bottle at the point of the stopper, and a long end left to dangle in a gas flame. Heat will flow along the wire and expand the bottle neck so that the glass stopper falls out easily. r Easy Thermometer Repair Through mishandling, the mercury col- umn of a thermometer sometimes becomes separated. By heating the stem of the ther- mometer gently over a subdued gas flame, and striking the instrument end-on against the palm of the hand, the broken column can usually be reunited. Modern Mechanix and HOME GIX-IT MA For Frozen Pipes If you have a water pipe that freezes in extremely cold weather, try covering it with felt, asbestos, or cork; then allow a small stream of water to trickle from a faucet near the danger section, to keep up movement in the pipe. If pipes are found frozen, prepare to shut off water pressure if a fracture is discov- ered. Then warm the pipes from the faucet end with a small blowtorch or other heating element. Heat applied should be gentle and Should not be concentrated on one section of the pipe, but moved gently back and forth. Burlap sacking wound around the pipe and saturated with hot water is effec- tive. Sometimes a candle gives sufficient heat. Be careful not to set fire to adjacent woodwork. Plaster Repair Kinks Broken plastering is one of the most common ailments of the interior finish of the home. The upper section of the above photo shows a crack in a tiled wall along the edge of a bath tub. The lower section shows the same spot repaired with a filling of plastic wood, which was smoothed into the opening, permitted to harden, and then coated over with a layer of enamel to match the wall. Because it is already mixed plas- tic wood affords a quicker repair to such breaks than regular plaster. Every home has various accessories mounted to the walls by screws, which frequently pull out, leaving a ragged hole in the plaster. Plastic wood can be used to fill up this hole, leaving a solid base into which the screw may be forced, or a wood- en plug can be driven in and screw reset. Inventions for February Vegetables Preserve Flowers An old method practiced in New England for the preservation of cut flowers is to mount them.in a good-sized fresh potato, cucumber, beet, or other solid vegetable. А sharp lead pencil or pointed instrument is used to punch one hole in the vegetable for each flower stem, which is inserted therein. The whole is then set in a vase with water sufficiently deep to cover the base of the stems. It is said that flowers will keep twice as long as usual when this method is employed. Preventing Short Circuits When the little strands of wire inside an electric plug work loose they often come in contact with the other side of the circuit and produce short circuits. This may be prevented by filling such plugs with melted sealing wax, sulphur, or just plain house- hold paraffin. Tar or pitch will also serve equally well, and once set in place afford sure insurance against short circuits and possible fires. The melted material used should be fairly hot so it will flow freely into all of the interstices. 87

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ut Your COAL Bills With

These air filter pads, inserted in the outlet pipes in the various rooms, will go a long way towards bettering health and cutting down cleaning costs for draperies and. curtains. The fine spun glass removes all the fine particles in the air. betterment. This is made pos- sible by the employment of special filter pads which have recently been put on the market. Made of fine spun glass, as illus- trated in the photo at the top of the page, these pads filter out all dust and other dangerous par- ticles which would otherwise be sucked up into human lungs. Not only that, but a great sav- ing in the cost of drapes, cur- tains, efc. is made possible,

R RS 3 a д i since most of the dust is extract- Here is the ventilating fan in position beside the cold air duct and read: b for action. The prop is supported by three iron bars which rest en the ЄЧ from the air by the pads. edge of the pipe. NOU be surprised to learn how wasteful the average furnace is. Because the air tends to stagnate in the pipes, there is a lot of heat expended for other purposes than warming the air. Here's a simple little stunt, however, that will go a long way toward substantially improving the efficiency of your home heat- ing system. The contrivance can easily be rigged up in any home workshop and applied to the furnace in a few minutes. Fan Keeps Air Circulating 'The function it serves is that of keeping the air in circulation in the pipes and hence in the rooms. Every possible calory of heat is utilized, making for a great saving in the coal bills, perhaps a ton or more a season. And a ton is easily worth saving in these times. The initial outlay will run you slightly more than the price of a ton of coal, but when next winter rolls around again you will be able to put the money-saving device into operation without any cost whatever. In addition to all this, however, a great benefit will accrue in the form of health 88 ake the holes for the belt as small as possible. Now let's get down to the А actual construction of the con- traplion. First on the agenda comes the fan, which is really the heart of the ven- tilating system. The hub should be made from a block of hard wood—any kind you have available. On two sides as illustrated in an accompanying drawing, cut a groove of the dimensions given. This is to take the fan blades. Use Hard Wood for Blades These blades may be made from any hard wood, three ply veneer being quite all right for the job. They should be cut to about the shape given in the accompanying photo. Form the blades so that the widest portion is at the bottom, with a tapering form running towards the tip. The length of the blades should be such that the diam- eter of the entire prop is about an inch less than the diameter of the pipe into which it is inserted. The blades are secured to the hub by first smearing the groove with glue, then inserting the butt of the blade and clinch- ing the bargain with a couple of finishing nails. Of course, the blades are to be set at opposite angles. Modern Mechanix and CJURNACE ‘Ventilating Fan

NS MAPLE BLOCK DO

The fan blades are shaped as illustrated in the photo above. The butt end is glued and nailed into the grooves in the hub block. At right is seen how the pulley to take the shaft is secured to the hub block. A set screw holds the shaft firm, to prevent play and wobbling. The completed propeller is secured to ihe shaft upon which it revolves in the manner illustrated in the accompanying drawing. It will first be necessary to bore a hole in the hub to take a short section of the shaft. Then to the hub is screwed a pulley having a collar and set screw. Make all these parts firm, since they have to stand a lot of wear and tear. This entire element of the ventilating system rotates in a bearing made from the head stock of an old lathe, which may be procured at any 5-10-25 cent store. Or if you can't procure it there, write to Modern Mechanix and Inventions editors, and they will be glad to give you purchasing data. Two iron bars, secured to the bottom of the headstock, as illustrated in the draw- ing at the top of the page, serve as supports for the bearing. The ends of these bars rest in the metal on the periphery of the cold air duct, this latter part being wrapped with asbestos cloth to prevent air leakage. Now for the power plant. This consists of a quarter, sixth, or eighth horse motor mounted in the position illustrated on the opposite page. It should be provided with as firm a base as possible, but any good Inventions for February

All parts of the ventilating system are seen here. The shaft for the fan revolves in a bearing made from lathe headstock.

HOLE FOR SHAFT SET SCREW

electrician knows that. The two pulleys on the motor and the fan blade respectively have a ratio of approximately 1 to 4. You may have to vary this by experimentation. See that the hole through which the motor pulley passes is as small and as air- tight as possible. Current consumption of the motor is small, so that there will be no substantial addition to your electric bill each month. Simple Cure for Leaky Valves Some radiator valves have an irritating way of dripping, dripping, dripping, with the result that a good carpet is sometimes ruined. Remedy this nuisance by covering {һе valve with.a sponge which has been hollowed out to fit p over the ү! metal. The waterthen ү | soaks into | ihe sponge and evapo- rates, act- ing as a hu- midifier.

9 у (а

HK sponse «< ‘OVER RADIATOR VALVE mn

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"Rubber “Bands “DRIVE Ghis RATCHET CLIPS FROM OLD PHONOGRAPH SPRING FREE WHEELING ASSEMBLY Fig. 1. Here's how the free wheeling system on the rubber band "motor" works. Note that the ratchet clips engage the notches in the wheel. Most of run is spent free wheeling. Be there the boy with soul so dead, Who to himself has never said: “Gee, I wish I had a baby auto.” HIS article will make those wishes come irue. Here is a nifty looking baby with clutch, two forward speeds and reverse, and Free Wheeling. The design is simple; the materials are cheap; which brings the building of this miniature car within the scope of the average mechanically minded boy's pocket book. It is powered with rubber band motors! 90 by DICK COLE The completed rubber band powered motor ready for a three-mile spin—from a single winding of the rubber band "motor." Headlights, horn, etc., add to attractiveness of car. Here's something distinctly new in the way of midget autos. Powered by a bat- tery of rubber bands from old inner. tubes, it will cover a distance of three miles at a surprising clip—and on one winding. Seated at the wheel you'll be the envy of all the youngsters in town. Now don't let skepticism enter your mind until you have listened to reason. To show the reader how much power can be stored up in the rubber band “motor” of the baby car, I shall illustrate. Suppose you looped three, heavy-duty, 6" inner tubes of good, live rubber over a solid post and looped the other ends around the bum- ‘per of a light car. Now start the car, The tubes will stretch out about five times their original length and will actually stall the car in low gear. Now think of the potential enerey poss sessed by those stretched tubes! Think how high they could hurl a rock if made into a giant catapult! That is the potential power stored in the rubber band motor—only more. When the Moderu Mechanix and «Жайге cAuto «тее eiles amount of rubber contained in three inner tubes is cut into narrow strips, the rubber has a greater elastic limit. The purpose of . the rubber band motor is to conserve all the available power and deliver it to the wheels of the car in an even flow. The plan and side view in Figs. 9 and 8 respectively, are not offered to familiarize the builder with the general working prin- ciples of the baby car. Here we see the sixteen rubber band motors which contrib- ute their twisting torque through a train of small gears to à common master gear. This, in turn, operates the pinion gear shaft which communicates the power to a cross- shaft, thence by belt drive to the wheels. gu The forward drive is through the right rear wheel only, and two round leather belts running over V pulleys of different sizes provide two speed ratios. Normally the belts are free on the pulleys, but an idler pulley can be brought to bear against either belt. The contact surface of the V ulleys is highly polished so that very little riction is contributed by the slack belt. The driven pulley floats freely on the back axle, and is fitted with a simple side ratchet device which engages the wheel itself. This provides free wheeling when the rubber band motor is stopped. This is done by pressing the left pedal. This action snubs a turn of sash-cord in a grooved pulley on the cross drive-shaft. See Fig. 9. Brakes are provided by passing aloop of sash-cord around a grooved pulley bolted to the side of each wheel, and lead- ing the cord to the right pedal. Each rubber band unit of the motor passes through a hole in the end cross rail SHEET METAL PIECE RIVETED IN SLOT IN SHAFT: | | 14". [р 4 с d ea [ЕК Mf == 14" PITCH 20 - RD.ll4"- FACE W'- HOLE %'- WITH: HUB Уд? X 4" CARRIAGE BOLTS CROSS DRIVE SHAFT. BRACKET „ | PITCH 12- RD. 2/5" FACE 54'— HOLE V4". WITH HUB: (3 USED) | PITCH- 20 - PD. 216" Vo" HOLE la^ USED) FACE e J (one TE Fig.2. (Above) Underside view of chassis shows "motor" wound up ready to de- liver its power to the gears. Motor as- sembly, seen in Fig. 3 at left, is built between two cross members at center section of frame. Power is delivered from the rubber bands to the wheels through the Boston stock gears. Front view of the car is seen at top left. Inventions for February 91

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Frame Must Be Strong to Stand Twisting Torque of Rubber Band Motor LL ji SEE DETAIL OF |: 1 MOTOR ASSEMBLY | E. 134 е ael = = - E ma ii ki SEE SPRING SPRING DETAIL Ев ‘Fig, 5. You can get a clear idea as to how the rubber bands are secured to the frame from this photo. Observe also pulleys on rear wheels for braking and transmission. 92 DETAIL — —»- ian a ЕШ Fig. 4. Elements of chassis are seen here. Birds-eye maple is recommend- ed, with parts glued and nailed, then reinforced with angle plates. Note manner of springing front and rear wheels, Front ends of rubber bands are held in the holes bored along the front and rear ends of the chassis. of the frame and is fastened to a special clip (Fig. 10). This permits the bands to be stretched while winding, which adds great- ly to the capacity of the motor. Fig. 4 shows the frame of the baby auto. Let it be understood that this must be strong and rigid to resist the twisting torque and pull of the sixteen rubber band motor. It is well to tightly mortise, glue and screw all joints, and, as an extra precaution, cap the joints with angle plates. The middle rails support the transmission unit of the motor, but this is covered in a special detail (Fig. 3). Front Axle Fig. 6 covers all the details of the front axle and the steering spindles. Carefully selected wood should be used, and an es- pecially hard, knotty piece for "the steering spindles. Birds- -eye maple is recommended. The sheet metal plates around the ends of the axle should be secured in place be- fore cutting the notch to receive the steering spindle (See Fig. 6). The cutting can be done on a jig-saw with a metal cutting blade. The size of the wheel axles depends upon the size of the hole in the wheels used. An old brake-rod with yokes, from an auto wrecking yard, will provide the tie- rods in conjunction with arms made of 5/16” eyebolts. The steering wheel hook-up is shown in a later detail. The spring sus- pension method of the front axle is better understood by consulting Fig. 4. Modern Mechanix and Power Is Delivered to Rear Wheels STEERING SPINDLE ‘TURNED FROM VERY HARD MAPLE — STUB AXLE SCREWED INTO WOOD AND LOCKED BETWEN,TWO NUTS Y gm " 3 бтов AXLE OR WHATEVER “SIZE FITS SHEET STEEL WHEEL AROUND ENDS BEARING OF AXLE xu HARDWOOD TAPPED 76 AXLE BOLTED RIGIDLY TO SPRINGS — ALL qb WHEELS AND PULLEYS TURN FREELY ON AXLE f? SNUBBERS ARE LOOPS OF FLEXIBLE CABLE 7] WHEELING (SEE DETAIL) 1" BRAKE 6 HIGH GEAR LOW GEAR. In Fig. 6 we have the rear axle, drive pulleys, free-wheeling and the spring sus- pension of the midget car. The notations attached to the drawings should make everything obvious. Here we see how four discarded valve springs add support to the otherwise rather flimsy springs. The simplicity of the free-wheeling is shown in Fig. 1 and needs no explanation. It is the free wheeling feature which gives the baby auto its wide range of travel. A few impulse turns of the motor, then free- wheel, and so on. By this economical means the car has a travel range of over three miles on one winding of the motor. The sketch shows 12" rubber-tired coast- er wagon or scooter wheels used. These Inventions for February 7 BRAKE PULLEY ONLY IS BOLTED TO WHEEL Through Belts Over Idler Pulleys Fig. 7. You will find it easy to cut out the front axle on the auto with a band-saw. The ends are strengthened with sheet steel which also serves to hold the steering spindle as illustrated in the drawings at left. LEFT SIDE DRIVE PULLEY BRAKE PULLEY * RIGHT SIDE DRIVE PULLEY Fig. 6. These drawings will give you clear idea as to the construction of the front wheels. You will see that some of the pulleys are grooved V-shaped, while others are round. Follow the plans carefully, Toy auto wheels should be used. IDLER PULLEYS can be obtained from a hardware jobber dealing in toys, etc. They may have to be ordered special and cost about $3.50 a set of four. In Fig. 3 we have the vital unit of the baby car—the power and transmission as- sembly. While this may seem rather com- plicated at first look, it is really very simple. Stock gears are used throughout, and can be bought cheaply from manufacturer's distributors throughout the country. If you have difficulty obtaining the gears, Modern Mechanix will inform you of your nearest agent. Of course all the holes must be laid out carefully, and, for safety, it is best to allow about .005" more than the regular pitch 93

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Horn, Headlights and Bumper May Be Added to Make Car Business-like Fig. 8. Ready for covering. Note positions of clutch and brake pedals in front and control lever at side. REVERSE LEVER SPRING LOCKS MOTOR WHEN FOOT 15 OFF CLUTCH PEDAL CLUTCH PEDAL WORKS FREE ON ATT dt ay | Tm | | КУ A H la M E RENA VEG AI hi \ \ MIT \ d ]|winE screen’ \ "I TH TET (i M à | \ tM, RAT TA | \ I И \ | ME n | a l| TACKED i [ j| ТАС! i, | | NUN hh | INSIDE T e LOI aree ERES Fig. 9. Assemble the parts for the car as illustrated in this drawing. Give particular attention to idler lever and pulley. | 94 Modern Mechanix and 19” | \ | REVERSE IDLER LEVER Sufficient Power May Be Stored іп Rubber Bands to Run Car 3 Miles RUBBER BANDS STRETCHED ABOUT 3 TIMES THEIR ORIGINAL LENGTH FOR INDING REVERSE BELT H GEAR PULLEY LOW GEAR PULLEY SCREWS HOLD FIELD orm FORWARD DRIVE BY RIGHT WHEEL ONLY LL SPRING KEEPS. JAN BRAKE CORD SLACK || Ч? Y. pSTOCK GEARS Æ Fig. 10. All the motor |1220. 2 FACE and control elements are i$ HOLE to be found in this draw- ing. Note particularly the reverse and forward con- trol lever. Right—Special winding device for bands. Above—Fig. 11. Wind up “motor” as illustrated here. Spe- cial crank disengages the rubber band, twists it, then slips it back into slot. Be sure to wind all bands in same direction. Left—Fig. 12. Back view gives good idea as.to how pulleys are arranged on reat wheels for braking and power trans- mission, Rubber bands are all wound up for 3-mile spin. diameter to prevent the possibility of any binding. All the gears are “with hubs,” and it is better to pin them to the shafts than to trust to set screws only. The location of the motor brake pulley— or clutch pulley—is shown. It can readily be understood how a length of sash-cord can be led to the clutch pedal, and how it will snub the pulley when the pedal is depressed. Fig. 9 gives the layout of all the pulleys. Selected white maple will serve for all the pulleys, but it is suggested that fiber or aluminum be used for the idler pulleys. These, of necessity, must be very thin to clear the idle belt. Note that all the drive pulleys are grooved 60 degrees. Round belts are used for transmission, and after a little wear they will assume narrow, flat sides which (Continued on page 136) Inventions for February 95

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Up-To-Date Homes Have ‘Chese “BUILT-IN Features Bed is equipped with springs that fasten to inner panel. When bed is open, it rests on two leather- covered stools built especially to support it. Even in a house where the doors are finished walnut or oak, these cedar-lined wardrobes are usually enameled to match the baseboards and door frame of the room. LTHOUGH there has been a gradual but drastic change in home-building in the last few years, at least one demand has remained constant, and that is the home maker's insistence upon ample accommo- dations for books, kitchen utensils, pro- visions and clothing. Although today's home is smaller than the Victorian home, more space is given to book shelves, cupboards, and closets than heretofore, and the space is utilized to better advantage. The accompanying pho- 102 Behind these attractively stenciled doors of walnut are hidden magazines and books, containing valuable infor- mation, that are no longer presentable to the house guests. tographs show practical ways of handling these features. The arrangement of the kitchen cup- boards shown is perfect. The commodious bins and shelves furnish plenty of room for groceries, cooking utensils, flavorings, cleaning powders, soaps, kitchen linens and china. Suites of kitchen units may be bought either of the detachable type or ready to build in. One may begin with a single cabinet and add pieces until the entire available wall space is covered. It is interesting to note that the kitchen space above the refrigerator is no longer wasted in the efficient kitchen but is util- ized in the way depicted, This arrangement is thoroughly practical for the refrigerator may be slipped out of the enclosure without disturbing it as the grilled portion is a hinged door. Built-in Wardrobes Are Popular Built-in, cedar-lined wardrobes are prov- ing very popular both in new and modern- ized homes. The usual arrangement is to have a space at the bottom for shoes and two shelves at the top for hats, the out of season hats going in the top shelf. The double doors to the right protect sliding tray-like drawers of varying depths. Built-in beds аге a convenience in the small home. By using one of them, it is possible to turn a living room, nursery, library, or den into a bedroom at a mo- ment’s notice. If desired, these beds can be equipped with box springs and be fully as comfortable as any others. After being made up they are folded back into a closet. The bed shown is simple in arrangement, the springs being fastened on the door. When the bed is open, it rests on two sturdy, leather-covered stools which were Modern Mechanix and uS p 7 There is plenty of room. in these cupboards for all the necessary kitchen utensils. They are stained an attrac- tive shade of green with the panels outlined in cherry red. built especially to support it. The room is furnished like a library with a large table and easy chairs. Thus, it does not reveal its double purpose to the casual observer. Today's magazines contain such valuable material that many people keep them. Un- fortunately, magazines do not stay attrac- tive nearly as well as books, so that it is well to have shelves for the older numbers, Where they may be hidden from sight. The highly pleasing arrangement shown pro- vides a desirable place for magazines and books that are no longer presentable. Doors and door frames are walnut with a formal design stenciled on them. Builtin Features Add to Home Value A home can hardly be considered up to the minute today unless it contains the features just described. Built-in features that are well designed add twice their cost to the value of a home, both in dollars and cents when it comes to selling and in the convenience that they afford. Fortunately, the home owner living in a house several years old may avail himself of any of the features described at little more cost and trouble than the owner can of the home under construction. Inventions for February Cupboard built above refrigerator utilizes extra space. 103

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Oiling System Well Shown in This Drawing; Also Offset Rocker Assembly |

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COVER STUD BOLT

PRESSURE LINE TO MAIN BEARING wy 1 П ‘ok

BAFFLE PLATES, OFFSET ROCKER,AND OILING SYSTEM

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The oil lines may be fully understood through this plan. Do not allow sharp bends in the tubing; 5/16 in. line is used throughout, with the usual fittings. Note the directness of lines to various parts of the motor. Use great care in fitting the offset rocker assembly into position. This is an unusual feature of the Harlequin and must be assembled with absolute precision. 'The position of the oil baffles is clearly shown and no difficulty whatever should be experienced with them. 110 Modern Mechanix and Marvelously Compact, Clean Designof the Harlequin Shown in Side View

| RIGHT SIDE VIEW OF MOTOR SHOWING MAGNETO MOUNTED

4)

Compact arrangement of magneto in relation to motor shown in this outline view of the right side of the engine. of the bushing in the cam gear. Simply take a 9$" drill and run it a trifle over half-way through the gear, thus remov- ing that part of the bronze bushing. Turn the end of the shafting so that it makes a very tight drive fit in the gear. Drive it in and then chuck up the gear and pro- truding shaft and finish the turning. This is so the shaft will be true with the gear. Check the gear carefully, both for center and for wobble. You will notice that there are two places where the shaft is square. Do this with a file, keeping these parts nice and truly square. It should be plain that this left hand cam gear bears partly on the regular cam stud and partly in the bushing in the cover. Tap ilie hole for the breather. This is a plain 94" pipe elbow. Make up the mag- neto bracket of 35" aluminum stock as shown and bolt it on. You will notice that we use a much simplified magneto drive arrangement, which is the reason we can use such a small and neat bracket. You may use nearly any type magneto you pre- fer. We use mostly Simms and Splitdorf. The type used will govern the style of the little gear extension fitting shown. The one shown is for the Splitdorf. The idea is to extend the gear far enough through the 172" hole so that it will mesh proper- ly with the R. H. cam gear. The end of the magneto must butt squarely up against the cover plate, with a felt washer between the two to keep it oil tight. If the mag- Inventions for February neto happens to have a rounded end, use an aluminum washer as shown. You will have to cut a taper hole in the extension fitting to fit the magneto shaft, and also two key seats, one for the shaft and one for the gear. You can make these with a file. After the magneto is fitted with its gear, which is also the regular Harley shaft gear, set it on the bracket and push the gear through till the two gears mesh properly. Then locate the holes on the bracket for drilling the magneto bolt holes. If the gears seem to bind, shim the mag- neto up slightly. The magneto used is a regular 4-cylinder type and of course runs at engine speed. 'This makes very easy starting. You will notice that there are no couplings, shafts, impulse couplings or other mess about this arrangement. The drawings show two 3/16" holes in both the cover and gear case, one above and the other below the center. These are for studs to stiffen the cover plate. ply cut two pieces of tubing having a 3/16" hole that will just reach from the case wall out to the cover. When making final as- sembly put these in place and slip a 3/16" bolt through, keeping the heads inside the crank case and the nuts on the outside of cover. We can now drill the ring of holes to take the screws holding the cover on. Drop the cam gear having the pump shaft on the L.H. stud. Tighten the pump shaft bushing up snugly and drop the cover in 11

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Ingenious Manifold Arrangement Makes Simple Job of Dismounting ЫЎ Х 20 GA. TUBES З" STEEL u 24 9 To FIT RUBBER HOSE CONNECTION ALLOWS FOR MOTOR HEAT EXPANSION WITHOUT STRAIN ON THE MANIFOLD., PLATE BENT CASE CURVE CARB. MOUNT! 3° | 74 GEAR CASE SIDE OF CASE UNIT r 15 X 18 GA. TUBE то SUIT CARB. THE CASE UNIT AS SEEN FROM THE LEFT SIOE.. CENTER SECTION OF INTAKE MANIFOLD SHOWN BOLTED'IN PLACE ON BOTTOM OF GEAR-CASE STEEL CARBURETOR 2w. FLANGE A REAR VIEW OF MOTOR SHOWING INTAKE MANIFOLD ASSEMBLY REGULAR MANIFOLI NUT WELDED TO TUBING AY LEAST 2" CLEARANCE THIS GAP IN MANIFOLD ALLOWS FOR MOUNTING OR DISMOUNTING OF MOTOR BY SIMPLY LOOSENING HOSE CONNECTIONS AND SLIDING HOSE UP ON MANIFOLD TUBE.. GAP IN MANIFOLD WILL PASS ING FLANGE " IF x 20сА. о | f'BOLTS THREADED ^ INTO CASE 3° "| WELD THE CASE UNIT AS SEEN FROM BELOW.. CENTER SECTION OF INTAKE MANIFOLD IN PLACE ON GEAR-CASE 2 NUT BRAZED INSIDE: SUGGESTED ARRANGEMENT FOR EXHAUST MANIFOLD.. THE CONSTRUCTION OF THIS ITEM MAY BE CHANGED TO SUIT COWLING NE um US Y "umi Ig x 20 ca. uk WELD —À The principal point of interest in the design of this manifold arrangement is that in mounting or dismounting the motor, all that is necessary is to disconnect the two rubber hose connections and the gap left in the manifold will allow the motor bearers to pass easily. The drawing is self-explanatory. Exhaust manifold arrangement may be changed by the individual to conform to style of cowling chosen. 112 Modern Mechanix and Direct Geared Drive to Ma gneto Eliminates Need for Shafting, Couplings TABLE-MOUNT Tx FLAT HEAD 4 MACHINE SCREWS SEEGERS хр fy АСАР screw | MAGNETO BRACKET OF 2'ALUMINUM STOCK 3" 8 GEAR CASE E COVER E 3% COUNTERSINK Top View oF TABLE-MOUNT Magneto bracket fits close to case, allowing direct geared drive without complicated arrangements. place. If with the R.H. stud in its support, the pump shaft doesn’t bind, everything is fine. Take it off. All around the gear case, on the outside make pencil marks oppo- site each screw boss. Replace cover and scribe an 8 15/16” circle. Opposite each of the pencil marks drill down through cover and into the case about 1%”. Use а 5/32" drill. Tap the holes in the case for 3/16" by 24 thread round head screw Enlarge the holes in the cover to 3/1 You will see in one of the drawings how the main oil line runs to the rear bearing. Drill a hole approximately in the position shown to pass %” water pipe. Drill so that the pipe will just clear the case wall. Run a long drill down through this hole and drill and tap the bearing boss for the pipe as shown. At this time we will mention a detail that was pur- posely not mentioned. Where this oil line goes through the bronze bushing a groove about 3/16" wide and 3/32" deep should have been cut in the bushing. Do this with a boring bar. This groove is to carry the oil around the crank shaft so that the hole in the side of the shaft is always open to the oil. The hole in the boss and bush- ing, the groove, and the hole in the shaft must all register. The distance of all three will be approximately 1 inch back of the front end of the bearing boss. Use a little thought on this. At the top of the %” pipe put an elbow and copper pipe coupling. The oil baffles may be put in now. They are shown plainly and may be of alumi- num, Dural or brass. Fasten them with 3/16" RH machine screws. Using these baffles there is no need for oil rings and the motor gets just the right amount of oil. And now we come to the gadget that looks bad, but is easy to do. It is the spe- cial double oil pump we worked out here. The advantages of a dry sump engine are so many we decided that was what we wanted, so we made it that way. Dry sump engines are lighter, free from smok- ing when upside-down and have far less head resistance. The pumps are both in Inventions for February one unit. They are made of the regular Chevrolet pump. Get two of them at any wrecking house and with a saw and file irim the mounting bracket off one of them. The regular pump cover is as shown and the two pumps are placed face to face with the plate between them. Each part has its set of gears as usual, but you will notice that on the rear pump, which is the pressure part, the gear with the square hole is bushed so that it fits the squared end of the pump shaft. This little bushing can be a strip of 20- gauge copper bent around in the hole and sweated in with solder. After the bracket has been sawed off the rear half the regu- lar screw holes must be drilled clear through with a 3/16" drill. Ordinary stove bolts are used for assembling, going ihrough the rear half and into the front half holding all together. Use the regular paper gaskets made for this pump. The pumps are from the older model Chevro- lets. There are the regular packing nuts with the pumps. The rear one takes the shaft and is packed in the regular way. The front one is soldered shut as shown and screwed in tight. The pump is put on ihe cover after the motor is assembled, (Continued on page 134) Side view of the Harlequin, showing all parts in place. Compare with the drawing on page 111.

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GJORTUNE eYCAKING Jdeas Millions of dollars in plumbing bills will be saved by the invention of a device that will prevent breakage of pipes when the bitter cold weather sets in. Piano keys have a way of getting dirty and yellow with passage of time. What is needed to remedy this situation is-some simple chemical compound for whitening the ivories and restoring their original lustre. The market is calling for such a preparation, so get busy you. inventors. 118 A simple pot stirring at- tachment for the kitchen stove will win favor with millions of housewives and bring big rewards to the fortunate inventor. Andrew Carnegie, the great steel king, once said that it is upon trifles that the great- est gifts of the Gods often hang. This is es- pecially true in the field of invention. Ofttimes it is the sim- ple ideas, such as those outlined here, that make the biggest for- tunes. Get busy— see what you can do. ODAY is the inven- tor’s day more than it has ever been in the history of mankind. We for INVENTORS INSTRUCTIONS TO INVENTORS WANTING ADVICE Mir. Yates, who conducts this special department for inventors, stands always ready to give expert advice on patent law and market- ing procedure to Modern Mechanix and Inventions readers. When requesting advice, however, do not send models, as they will not be accepted. Your re- quests will be taken care of promptly and adequately if you merely send a clear drawing and complete con- stfuctional and operating data. Stamped return en- velope must be enclosed. Address Mr. Yates in care of Modern Mechanix and Inventions, 529 So. 7th St., Minneapolis, Minn. really seems as though there would be some method of permitting ex- pansion to take place in Machines that will weigh and stamp packages or letters оп Sundays and holidays will prevent К need new things, new ideas, better ways of doing old chores. In- dustrial paralysis such as we have been passing through finds its defeat ultimately in new ideas, new inventions. Now is the time to invent, now is the time to reap the richest rewards. Pity those who think that times of depression are not for the inventor. They are his heydays. l. Automatic Pot Stirrer We have many and marvelous automatic machines in this great day and age, and yet housewives still stand over hot stoves to stir their pots and kettles. Why not a little device that could be set to do this and per- mit the housewife to go about her other work? We have the energy in the form of heat in the stove itself and all we need is some оо a little heat engine that will do the trick. Specifications: This problem would be impractical if solved electrically for the simple reason that stoves are hot and in- sulation is perishable. The device should be thermal and the invention should be developed with the thought in mind that few people would want to pay over a dollar or it. Exploitation: Should be sold entirely on royalty and the inventor should ask 4% of the gross. Only Americans would appreci- ate an invention of this sort and it should be patented in United States and Canada only. 2. Anti-freeze Device Every year in the northern climates plumbers wax rich and millions of dollars are lost through freezing water pipes. It Modern Mechanix and pipes without their freez- ing. Perhaps some kind of a gadget placed in the water line would take care of the matter. At any rate I certainly do know that a mint of money could be made with the scheme. Specifications: Should not cost over fif- teen dollars and must be able to prevent pipes either from bursting after they freeze or from freezing in the first place. Exploitation: Should be patented in all northern countries and sold on a royalty in each country. 3. Making Piano Keys White I cannot help but wonder why some wise fellow has not developed a simple com- pound for whitening piano keys. I once tried to buy such a thing and found that it was not manufactured. Here is a fine op- portunity to develop a fast working mate- rial that any housewife may safely use and that may be protected with a formula patent. Specifications: Should be made to sell for twenty-five cents and enough should be placed in each can or package to permit cleaning the keys at least a dozen times. The material should not only function in connection with pure ivory keys but it should also be effective in connection with the cheap celluloid substitutes. Exploitation: This should be patented in all of the leading countries of the world and sold on royalty. 4. Automatic Postage Machine Our post offices are always closed on Sun- days and holidays. What is needed is an automatic postage machine into which we (Continued on page 140) Inventions for February delay in handling mails for the impatient public. by RAYMOND F. YATES Considerable savings in coal bills will be made by the invention of an automatic soot remover. The only operation necessary to clean the pipes should be a pull of a lever. Nothing is more attractive than a waxed floor, yet nothing is more dangerous. Won’t some kind-hearted inventor get busy and develop a material which will polish the floor to a high shine, but at the same time leave a non-skid sutface, which won’t be a menace to everyone. 119

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“ALL SORTS"—an ALL- This is a he man's boat suitable for any kind of service—row it, power it with an outboard, sail it, or adapt it to iceboat service with its clever fitments. “AI Sorts” is in keeping with the times—she gives you more for your money. SOME years ago I built a little boat that was quite dandy for use as a dinghy. She was a combination sailer, rowboat, or ten- der. Being portable she could be thrown onto any old pair of wheels and be trekked to parts unknown for high adventure. As I used her I found that this point could be improved, and that point, and so I re- Solved one afternoon while sailing on Otter- tail Lake in Minnesota to “git behind th’ new project an' shove." So I did. The resulting design is shown right here. Her name is “All Sorts.” This final evolution is a grand little boat. She is ten feet long, and 44 inches beam— very generous width for a boat so small. She will weigh less than 60 Ibs. and is there- fore portable. Because of her construction, which is typical of the Long Island long- shore boats, she is very very rigid and stiff and will take a lot of jumping and knocking about ona cross country trek. Her materi- als will cost about $15 for lumber and about $5.00 hardware. The sail can be had here for ten bucks if you want to buy a brand new one from the magazine, and the iceboat attach- ment will cost according to the going wages for local blacksmithing in your community. “All Sorts” lays her chief claim to fame in her versatility. She is at once a portable fishing and rowing skiff, or an excitingly capable little sailboat, or an outboard, or an iceboat. + Неге is how she was built. After the idea was reduced to drawing form, I decided to build one of these little critters to see how she'd work out. At the Mechanical Package Magazine Experiment Station Sam Wing and Maurie Lonn were equipped for a job like this, and I asked my brother editor, Don Cooley, who runs this yere M-M book, if he didn't think he'd like to build up “АП Sorts" to show his readers just what a swell little boat could be used for. He did. So we started work. The lines were laid down full size on brown wrapping paper. In other words the drawing of the sheer profile and the half breadth plan were laid out from the table of offsets. By this means the drawing was repro- duced the size of the boat. The offsets table, let me explain, is no mystery. It is a tabu- lation of the dimensions of the frames done in simplified style. Thus it avoids a lot of confusion of dimensions crossing and re- crossing one another. For instance, you can see where the base- line is laid out on the profile drawing on page 124. Six inches above this is the water line. Then six inches above this is water line No. 1. The dimensions for the curve of the stem are shown. The stations are 24" apart. On each of these stations there is a height. For instance the height of the sheer line at station No. 1 reads 1-8-4 on the offsets table. This means that the dot through which the sheer line must pass on station 1 is 1 ft. 8 ins. and 4/8" (or %” in other words) from the base- line. At station 2, the height of the sheer above the baseline is 1-5-5, or 1 ft., 5 ins. and 5/8" as all dimensions in the table are ft.—ins.—8Sths. By following out this reading of the offsets table the full size set of lines is laid down. These lines must be laid down. One cannot build a fair “All Sorts” as an iceboat. With a minimum of extra gear this fine little sailboat can be adapted into a really fast iceboat in which one man can ride. 122 boat without the full size line drawings. Modern Mechanix and "PURPOSE “BOAT by WESTON FARMER The inset shows “АП Sorts” as a plain tender or dinghy. As such she'll make a portable little rowboat or fishing boat. Left center shows her with two aboard sailing on The Lake cf the Isles, Minneapolis. She furnishes splendid sailing. One word of explanation: If the batten you use to draw around will not bend through each point given in the offset table fairly, average the lineup—fair it up —the offset table can be and very often is wrong. The whole purpose of the laying out is to fair the boat up on your own floor before you use the full size drawing for patterns for the molds and for the stem. Stem Is Next When the lines are laid out, cut out the stem just as we did. This is a piece of 1%” thick white oak. A piece 194" by 8" by 2' will give a piece for the stem. Lay this piece under the lines drawing and drive brads through the stem profile. Then pull the brads out. This will show a pattern of nail holes which can be sawed to shape on a bandsaw, or by hand. Then cut in a rabbet, just as we did, by making a fid as it is called, just the thick- ness of the topside planking of the boat, and setting it into the wood at the right angle, the depth equal to the thickness of the planking. Next, as shown in Fig. 1, arrange a Inventions for February Ва The author at the left and Hudson Keith, of the Packmag Experiment Station, launch the boat at the door of the Sta- tion. just like dunking a doughnut! strongback of 2x12" scrap lumber which is fairly straight. Space off the stations, and make temporary molds from the lines drawings of the sections. It is around these molds that the planking is bent. The thickness of the planking, 4%”, must be subtracted all around the mold, as the drawing is to the outside of the hull. Then rum setup will look like the photo, "ig. 2. The transom is made of 34" mahogany or oak, well cleated together and fastened "123

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